95results about How to "Guaranteed output performance" patented technology

The invention relates to a battery group discharging control method and a battery group charging control method, and belongs to the technical field of new energy automotive power battery application. Aiming at circular current of a parallel-connected battery group, battery packs are connected in parallel after respectively passing through corresponding relays, on / off of each relay is controlled according to voltage sampling on and the specific state of the corresponding battery pack so as to realize charging and discharging control on the battery packs, battery information is transmitted to a finished automobile through a finished automobile CAN, and the finished automobile makes appropriate power request and restrictions according to information sent by a battery management system so as to eliminate or suppress circular current of the battery packs connected in parallel, ensure the maximum output capacity of the batteries and ensure the safety of the batteries and personnel.

Provided is a permanent magnet type rotating electric machine. A rotor core is provided with a plurality of slits extending in the rotation shaft direction, independently of openings. The first slit is arranged at the center of the magnetic pole of the rotor core to be capable of absorbing stress acting on an inner circumferential surface of each opening in a direction normal to a main surface of a permanent magnet. The second slit is arranged between the magnetic poles of the rotor core to be capable of absorbing stress acting in parallel with the main surface of the permanent magnet. Thus, the rotor core is prevented from deforming in a radial outward direction. Further, by forming the first and second slits each in a form not interfering the magnetic path of the magnetic flux by the stator passing inside the rotor core, the motor performance is ensured.

The invention provides a multifunctional mobile phone bracket. The device consists of a lower half spring clamp, an upper half spring clamp, a setting hose, spherical rubber, a mobile phone placing platform, spring telescopic claws, an android mobile phone data line, an iphone data line and an OTG (on-the-go) data line, wherein one side of the lower half spring clamp is provided with a line storing box and a USB (Universal Serial Bus) interface; the line storing box is used for storing the mobile phone data lines; the USB tip of each data line is connected with a power supply to supply power to a mobile phone; the OTG data line is embedded into the USB interface, and is used for connecting storage equipment such as a USB flash disk and the like; the upper half spring clamp is connected with one end of the setting hose; a spherical shell at the other end of the setting hose and an outer sphere at the lower end of the mobile phone placing platform construct a sphere pair through the spherical rubber, so that convenience is brought to micro position adjustment of the mobile phone placing platform; the tips of the android mobile phone data line and the iphone data line extend out of the two ends of the mobile phone placing platform respectively; four spring telescopic claws are symmetrically arranged on two short sides of the platform to accommodate mobile phones of different sizes; one long side of the platform is provided with a boss which is used for supporting the mobile phone, so that the mobile phone can be fixed on the mobile phone placing platform firmly.

The invention relates to a producing method of anode supporting yttrium oxide stable zirconium oxide electrolyte membrane. It relates to the producing method of electrolyte membrane used in solid oxygen compound fuel battery. It is produced following the steps: making multi-hole anode supporting; making YSZ electrolyte membrane on the surface of the supporting; forming ethyl cellulose terpilenol solution; adding YSZ powder into the solution and grinding for over two hours to form electrolyte stuff; spreading the stuff on the surface of supporting; sintering the dried anode supporting and the electrolyte membrane to gain anode supporting YSZ electrolyte membrane. The electrolyte membrane produced following the invention is equality and compact. Its thickness is between 10-30mucrometer. The cost of the device is low, and the operation is easy and fast. Meanwhile the ideal output power density of fuel cell is ensured.

The invention discloses an arrangement-type floating running water power generation device. The arrangement-type floating running water power generation device comprises a floating frame and water wheel sets, transmission assemblies and a power generation assembly which are installed on the floating frame; the water wheel sets are connected with the transmission assemblies through transmission parts installed on water wheel shafts, and the transmission assemblies are connected with the power generation assembly; the water wheel sets are formed by installing multiple water wheels on the floating frame in the counter-flow direction in parallel at intervals; each water wheel at least comprises one water wheel shaft and impeller blades installed on the water wheel shaft. According to the arrangement-type floating running water power generation device, due to the resultant output of the multiple sets of the water wheels, the outputting efficiency and the outputting capacity are guaranteed; the water wheels which are arranged at intervals are beneficial for water flow driving; due to the fact that the multi-buoy design is adopted, the replacement and the maintenance are convenient; landing support legs are used for preventing the device from falling into water bottom sludge when the water level is low, a windshield effectively protects the normal work of the water wheels, the equipment operation is safer, the usage cannot influence the ecological environment, and the occupied space is small; power is generated by utilizing directional natural water flow, the investment is low, the gain is quick, and the economic benefit and social benefit are significant.

The invention discloses a composite magnetic pole type surface-mounted permanent magnet synchronous motor, which belongs to the field of permanent magnet motors. The composite magnetic pole type surface-mounted permanent magnet synchronous motor aims to solve the problems that harmonic wave is in the presence in a sinusoidal-current-driven rare earth permanent magnet synchronous motor air gap magnetic field and local irreversible demagnetization always happen. The composite magnetic pole type surface-mounted permanent magnet synchronous motor comprises a rotor and a stator, wherein the rotor is arranged in the stator; a radial air gap is formed between the rotor and the stator; the excircle surface of the a rotor iron core is evenly provided with a plurality of rotor magnetic pols in a surface-mounted way; each rotor magnetic pole comprises a rare earth permanent magnetic pole and two ferrite permanent magnetic poles, wherein the left end surface and the right end surface of the rare earth permanent magnetic pole are independently provided with one ferrite permanent magnetic pole; the rare earth permanent magnetic pole and two ferrite permanent magnetic poles form a continuous circular-arc magnetic pole structure; and the magnetization directions of the rare earth permanent magnetic pole and two ferrite permanent magnetic poles are all radial magnetization and are the same. The permanent magnet synchronous motor of the structure causes the harmonic content of the air gap magnetic field to be lowered, motor efficiency is improved, the ferrite permanent magnet material is low in price, and cost is lowered.

There is provided a fuel cell system capable of appropriately regenerating catalyst at the cathode side or the anode side. The fuel cell system (1) includes regeneration means (21, 24, 33, 35) for controlling the gas supply amount of a fuel gas and a oxidant gas supplied to a fuel cell (2) so as to recover the lowering of activity of the catalyst of the fuel cell (2). The catalyst regeneration process at the side of the cathode (12) of the fuel cell (2) is performed by regeneration means which reduces the flow rate of the oxidant gas to less than a stationary request in the relationship with the fuel gas, thereby lowering the cell voltage of the fuel cell (2) to a predetermined voltage. The catalyst regeneration process at the side of the anode (13) is also performed by the regeneration means which reduces the flow rate of the fuel gas to less than a stationary request in the relationship with the oxidant gas.

The embodiment of the invention discloses a display screen sound production method and device, an electronic device, and a storage medium. The method is applied to the electronic device, and the electronic device comprises a display screen, a plurality of exciters for driving a display screen to perform sound production and a plurality of vibration monitoring modules for monitoring the vibration of the display screen to collect sound. The method comprises the following steps: when a user uses the electronic device to make a video call, acquiring a first position on an ear of the user corresponding to the display screen and a second position on a mouth of the user corresponding to the display screen; obtaining a first sound production area corresponding to the first position and a second sound production area corresponding to the second position in a plurality of areas; sending a first driving signal to the exciter corresponding to the first sound production area to drive the first sound production area to output sound; and sending a second driving signal to the vibration monitoring module corresponding to the second sound production area to drive the second sound production area tocollect sound. By adoption of the method, the quality of the video call can be ensured.

The invention provides a hybrid power supply employing a metal air fuel cell and a lithium-ion battery and a control method. The hybrid power supply comprises the metal air fuel cell, the lithium-ionbattery and a power output port, wherein a positive electrode of the metal air fuel cell is connected with the positive electrode of the lithium-ion battery and a positive input end of the power output port separately; a negative electrode of the metal air fuel cell is connected with the negative electrode of the lithium-ion battery and a negative input end of the power output port separately; thepositive electrode of the lithium-ion battery is connected with the positive input end of the power output port; and the negative electrode of the lithium-ion battery is connected with the negative input end of the power output port. According to the hybrid power supply, the advantages of high capacity of the metal air fuel cell and large power output of the lithium-ion battery are developed, andthe lithium-ion battery is continuously or intermittently charged through the metal air fuel cell, so that a portable power supply system combines relatively high endurance with medium-high power carrying capacity.

The invention discloses a three-level H-bridge five-level inverter direct-current side capacitor voltage balancing method. According to the method disclosed by the invention, based on the traditional MPC algorithm, tracking of a reference voltage serves as a main objective, and the three-phase direct-current side capacitor voltage is effectively balanced. The method comprises the following steps: establishing corresponding mathematical models for all five-level space voltage vectors, calculating each phase current value of each vector during action, and performing classified analysis on the influence of each voltage vector to a capacitor neutral-point potential; rapidly determining the amplitude and position of the reference voltage in a space vector diagram by utilizing a SVPWM (space vector pulse width modulation) algorithm, and selecting the position and balance vector participating in prediction each time; then establishing a mathematical model of discretized switch, load and direct-current capacitor voltage for the three-level H-bridge five-level inverter; and finally, constructing an appropriate cost function, and optimizing the selected position and balance vector. According to the method disclosed by the invention, real-time balance of the three-phase capacitor neutral-point potential can be realized, and the output performance of the inverter is guaranteed. In addition, because the optimizing vector each time is composed of four balance vectors and three position vectors, the operation amount is small, and the efficiency is high.

The invention relates to the technical field of preparation of semi-conductive composite materials, and particularly discloses a semi-conductive silicone rubber roller material with highly repeated charge and discharge properties and a preparation method thereof. The semi-conductive silicone rubber roller material with highly repeated charge and discharge properties is made of the following raw materials in parts by weight: 50-90 parts of methyl vinyl silicone rubber, 10-50 parts of ethylene propylene diene monomer, 8-15 parts of conductive masterbatch A, 5-12 parts of conductive masterbatch B, and 1-5 parts of cross-linking agent. The volume resistivity of the semi-conductive silicone rubber roller material is in a range of 0.42*10<4>-0.88*10<4> [omega]*cm in a semi-conductive region (ie,about 105-109 [omega]*cm), and the resistance of the material is extremely stable, and in a high-temperature high-moisture environment, no chemical substance that oozes a photosensitive drum seeps; and in addition, the material has good printing durability, can ensure stable image output, and has a long service life.

The invention discloses a guiding exposure type fluorescent endoscope system and a guiding exposure method. The exposure of a fluorescent camera is controlled by guiding light, so that the gray of anoutput fluorescent image is kept consistent at different imaging distances between an endoscope and an observed tissue; and a guiding light source is controlled to be stroboscopic by a stroboscopic control device, so that the guiding light source only plays an exposure guiding role, does not appear in a fluorescence imaging field of view, and ensures an output effect of the fluorescent image.

The invention relates to direct communication between brain thinking and external environment. The invention provides a BCI (Brain Computer Interface) system for fine motion mechanical arm on-line control based on mixed characteristics, accurate fine motion recognition can be realized, specific brain region training is facilitated for patients with motion function impairment, and the system is expected to develop thinking and lay a technical foundation for BCI technology development of stroke rehabilitation treatment. Meanwhile, multi-instruction output is met. Therefore, the technical schemeadopted by the invention is as follows: a mechanical arm controls on-line brain-to-brain control; According to the machine interface implementation method, three kinds of actions including a thumb, anindex finger and a little finger are designed for different fingers of a right hand; Electrical stimulation induced SSSEP features are given to the thumb and the little finger, the recognition performance is improved, then decision values are output through the spatial filtering, feature extraction and mode recognition processes, and finally corresponding instructions are sent through a Bluetoothdevice to control a mechanical arm to complete designated actions. The method is mainly applied to medical instrument designing and manufacturing occasions.

The invention relates to the technical field of biomedical equipment, and in particular, discloses a frozen pipe cover mounting mechanism. The frozen pipe cover mounting mechanism comprises a cover loading machine, a cover pressing machine, a cover screwing machine, a pipe unloading machine and a feeding machine; the cover loading machine comprises a first arc conveying rail, a second arc conveying rail, a third arc conveying rail, a fourth arc conveying rail and a fifth arc conveying rail; the cover pressing machine comprises a T-shaped plate, a through hole, an air blowing pipe, a first cylinder, a metal plate and a photoelectric induction switch; the cover screwing machine comprises a second cylinder, a driving mechanism and a third cylinder; a driving mechanism comprises a first driving motor and a rotating mechanism; the pipe unloading machine comprises a fourth cylinder, an unloading hopper, a push plate, a horizontal baffle plate and an inclined baffle plate; the feeding machinecomprises a turntable and a cutter; and the turntable is provided with a mounting column, an assembly hole, a push rod, a push block and a third spring. The frozen pipe cover mounting mechanism has the characteristics of higher conveying efficiency, lower labor cost, no unqualified product, better cover screwing effect, higher collecting efficiency and higher automation degree.

The invention discloses a control method of a multi-split heat pump system. The multi-split heat pump system comprises a compressor, at least one hydraulic module and at least one air conditioner indoor unit, wherein the at least one hydraulic module and the at least one air conditioner indoor unit are both connected with the compressor. The method comprises the steps that first energy demand information of the at least one air conditioner indoor unit and second energy demand information of the at least one hydraulic module are obtained; the first energy demand information represents the heating capacity demand condition of the at least one air conditioner indoor unit, and the second energy demand information represents the heating capacity demand condition of the at least one hydraulic module; and the operation frequency of the compressor is adjusted according to target parameters corresponding to the first energy demand information and the second energy demand information. The invention further discloses the multi-split heat pump system and a computer readable storage medium. According to the multi-split heat pump system, the control method thereof and the computer readable storage medium provided by the invention, the output capacity of the compressor is accurately matched with the actual indoor heat exchange requirement, and indoor environment temperature adjustment and hydraulic module heat supply are effectively considered.

The invention provides an implanted energy collection device. A buffer air bag is arranged on a packaged friction nanometer power generator, comprises an elastic telescopic structure and is connected with a space between two friction layers of the friction nanometer power generator via an air hole or an independently-designed gas passage; when the fiction layers of the friction nanometer power generator are in contact with each other by an effect of an external force, a gas between the two friction layers enters the buffer air bag to be temporarily stored via the air hole or the gas passage; and when the external force is removed, the temporarily-stored gas can be automatically discharged to the space between the two friction layers by the buffer air bag, and the fiction layers are helped to complete separation action. With the energy collection device structure provided by the invention, contact and separation can be effectively completed by the friction nanometer power generator to achieve normal output performance, a direct effect of an internal gas on a package layer is also prevented, and the stability of the device is improved.

The invention relates to hydrogel-containing catalyst slurry, a catalyst layer prepared from the same and a fuel cell electrode. The catalyst slurry comprises an organic solvent, as well as a catalyst, an ion conductor and hydrogel which are dissolved in the organic solvent, wherein the hydrogel is selected from lignosulfonate hydrogel or acrylic acid hydrogel. The catalyst layer can be obtained by coating the catalyst slurry. The preparation method of the fuel cell electrode includes the following steps that: (a) weighing a catalyst, an ion conductor and hydrogel, sequentially dissolving thecatalyst, the ion conductor and the hydrogel in an organic solvent, and performing uniform dispersing to obtain catalyst slurry; and (b) uniformly coating the catalyst slurry obtained in the step (a)on a gas diffusion layer or a proton exchange membrane, and then carrying out drying treatment to obtain the fuel cell electrode. Compared with the prior art, the fuel cell electrode can assist in solving a water management problem possibly occurring in high-temperature and low-humidity operation of a traditional fuel cell electrode and guaranteeing the output performance of a fuel cell.

The embodiment of the invention provides a circuit for reducing the memory effect of a radio-frequency power amplifier, an output circuit of the radio-frequency power amplifier, and the radio-frequency power amplifier. The harmonic impedance of the radio-frequency power amplifier can be controlled in an optimal range while the memory effect of the radio-frequency power amplifier is reduced. The circuit for reducing the memory effect of the radio-frequency power amplifier comprises a first micro-strip line, a second micro-strip line, a first capacitor and a second capacitor, wherein one end of the first micro-strip line is connected with one end of the second micro-strip line; one end of the first capacitor is connected with one end of the first micro-strip line; the other end of the first capacitor is grounded; one end of the second capacitor is connected with the other end of the second micro-strip line; the other end of the second capacitor is grounded; for the fundamental impedance and the envelop impedance of the radio-frequency power amplifier, the first capacitor is in an open-circuit state; and, for the envelop impedance of the radio-frequency power amplifier, the second capacitor is in a short-circuiting state.

The invention discloses a rotor structure for improving irreversible demagnetization resisting capability of permanent magnets of a permanent magnet motor. The rotor structure comprises a central rotating shaft and a rotor core, wherein the central rotating shaft and the rotor core are mounted by sharing the central axis. Around the central axis, a plurality of U-shaped through grooves identical in shape and size are formed in the rotor core evenly. The permanent magnets are arranged at bottom groove bodies of the U-shaped through grooves. A plurality of non-communicated magnetic bridges are arranged on lateral groove bodies of the U-shaped through grooves. The rotor structure has the advantages that magnetic bridge structures, not completely communicated with one another, are arranged onthe lateral groove bodies of the U-shaped through grooves, and accordingly, the irreversible demagnetization resisting capability of the motor is improved effectively; torque output capacity of the motor is not influenced by the magnetic bridge structures obviously, and accordingly, output performance of the motor is guaranteed.

The invention belongs to the technical field of current prediction and discloses an APF current prediction control method for self-adaptive regulation of direct-current-side voltage based on internet. A dynamically compensated current signal is connected with a server through a signal line, and the server transmits the signal to a power grid monitoring terminal through the internet to achieve real-time monitoring. Timely sending of predicting results to the terminal is achieved through the internet, convenience is brought to a worker for timely knowing, and the operating safety and stability of equipment are improved. The method is achieved based on prediction control, does not need a complicated modulation link of a PWM method, and a structure is simple. Self-adaptive regulation of APF direct-current-side voltage is achieved, the direct-current-side voltage can be adjusted according to compensating current and power grid voltage in real time, smaller current ripples and power loss are kept while APF output performance is ensured, and the APF compensating performance.

The present invention provides a valve transmission device for an engine. A crankshaft (12) and a camshaft ( 36) between the timing transmission device (37), the two ends of the camshaft (36) are connected by a side wall (5a) of the cylinder head (5) and a branch adjacent to the timing transmission chamber (48). The partition wall (5b) is supported, and between the above-mentioned side wall (5a) and the partition wall (5b), a valve transmission chamber (49) for accommodating the camshaft (36) is separated. The lower part of the transmission chamber (48) is equipped with an oil throwing ring (72), and the above-mentioned partition wall (5b) is provided with a passage for guiding the splash oil thrown off at the upper part of the timing transmission device (37) to the valve transmission chamber (49). The oil hole (75), and an oil return passage (77), which transmits the pulsating pressure of the crankshaft chamber (9) to the valve transmission chamber (49) and makes the oil stored in the valve transmission chamber (49) flow down to the crankshaft The crank chamber (9) inside the case (2). As a result, the arrangement of the camshaft overhead relative to the intake and exhaust valves can be maintained, and the timing transmission chamber and the valve transmission chamber, which are separated from each other, can be lubricated without using an oil pump.

The invention provides a screen brightness adjusting method. The method comprises the steps of obtaining respective ambient light intensities of a first screen and a second screen of the electronic device; wherein the two ambient light intensities are a first ambient light intensity and a second ambient light intensity; therefore, the two ambient light intensities are used; adjusting respective screen light intensity of the first screen and the second screen; during this period, if the obtained difference value of the two ambient light intensities meets a specific condition, determining that the light intensity is abnormal; through the above adjustment, the device can be adjusted, the adjusted screen light intensity is corresponding to the screen with higher ambient light intensity; compared with a screen with relatively low ambient light intensity, the adjusted screen light intensity is relatively low; therefore, the display light intensity presented after the ambient light and the screen light on each screen are superposed is basically the same, namely the display brightness displayed to the user by the two screens is basically the same, the user does not need to manually adjustthe screen light intensity of each screen, the operation is very convenient, and the output effect of multiple screens of the electronic equipment is ensured.

The invention discloses an APF current prediction control algorithm with self-adaptive adjustment of DC side voltage, and belongs to an APF current prediction control algorithm. The control algorithm comprises the following steps: 1, obtaining eight voltage vectors from eight switch states of an APF; 2, according to sampling signals, calculating a compensation current vector ih, a power network voltage vector e and a compensation current vector ic; 3, according to a system condition, calculating a DC side voltage reference value V<dc><*>and a compensation current reference value i<*> which are needed by the APF, and adaptively controlling the DC side voltage; 4, predicting compensation current which can be output by the APF under the respective effects of the eight switch states Sn; and 5, according to a difference between each compensation current predication value i<n> and the reference value i<*>, performing selection on the switch states for applying to each switch device. The APF current prediction control algorithm has the following advantages: the algorithm is simple in structure, can adjust the DC side voltage in real time according to change of the system condition, maintains quite small current ripples and power loss while guaranteeing the output performance of the APF, and improves the compensation performance of the APF.

The invention relates to a PMSM single-resistor current reconstruction method and system. After being started, a PMSM is operated in a CSVPWM manner, and whether a work state of the motor is in a phase-shift saturation area of a high voltage modulation zone is determined; and if YES, a spatial vector PWM is changed from CSVPWM into DSVPWM, and action time of an adjacent voltage vector is limited. Compared with the prior art, the cost is reduced, and the method and system can realize a PMSM control effect as that achieved by double current sensors.

The invention relates to a piezoelectric thread driving type one-dimensional positioning platform, and belongs to the technical field of precision driving and positioning. The platform comprises a positioning workbench, a lifting mechanism, a driving mechanism and a base; the driving mechanism includes a piezoelectric thread driver composed of a stator and a rotor; the stator consists of four piezoelectric transducers with the same structure and a flange nut, and the rotor is a screw rod; the four piezoelectric transducers are located in the base and connected with the outer circumference of the nut base through flexible hinges respectively. The flange nut is fixed to one axial end of the nut seat and connected with the screw in a matched mode. The upper end of the screw rod is in contactwith the bottom surface of the positioning workbench, when two groups of sine alternating-current voltages with the same frequency, the same amplitude and the phase difference of pi / 2 are adopted andthe driving signals are used as two groups of driving signals for forming four piezoelectric transducers which are orthogonally arranged, the screw rod is driven to obtain the rotating speed, generateclockwise or anticlockwise rotating motion and convert the clockwise or anticlockwise rotating motion into axial linear motion, so that the positioning workbench is pushed to generate upward or downward lifting motion.

The invention relates to a household antitheft alarm system based on intelligent carpets. The system comprises the intelligent carpets, the intelligent carpets are connected to a central controller, each intelligent carpet comprises a trampling detector, an alarm signal is output when the trampling detector detects trampling by a human, the central controller comprises a configuration module, and according to a preset instruction, the configuration module configure one or multiple random trampling detectors to be in the working state. Thus, input and output effects can be ensured, a better detection feedback effect is achieved, it is ensured that the whole system is higher in the antitheft performance, interaction is convenient, and normal use of residents is not influenced.

The invention provides a beam information arrival direction determination method and a device and a storage medium, and the method comprises the steps: determining the target beam information of a to-be-tracked object according to an array formed by a plurality of microphones and the target voice information of the to-be-tracked object; determining direction response power of the target beam information in each preset direction according to the target beam information, an array structure formed by a plurality of microphones and a wave velocity forming algorithm; and determining the preset direction corresponding to the maximum direction response power as the direction of arrival. The direction response power is determined through the array structure formed by the microphones, the wave velocity forming algorithm and the target wave beam information determined according to the target voice information, the arrival direction is determined according to the maximum direction response power,and the direction of the speaker can be automatically tracked according to the arrival direction. The accuracy of determining the position of the sound source is improved, so that a speaker can stillkeep the output effect of the microphone sound under the condition of changing the speaking direction.

The invention discloses a motor current dynamic adjustment method, which comprises that parameters are set through a motor control system; a current regulation triggering mechanism is set through themotor control system; a current loop output protection limit value is set through the motor control system; when the real-time current of the motor is smaller than an overcurrent protection limit value and an overload protection limit value, an alarm is not triggered, and the motor outputs at the maximum torque; when the real-time current of the motor is suddenly increased and the current value exceeds a current protection threshold value, a current regulation mechanism is started, wherein the current loop output current is dynamically limited, and a bus voltage coefficient is regulated to reduce the output capability of the motor within a preset time; and when the real-time current of the motor is smaller than the current protection threshold value, the bus voltage coefficient is regulated, and the current loop output protection limit value is restored to the preset value, so that the motor is restored to the maximum output capacity. According to the invention, the output capability of the motor can be ensured, alarm triggering caused by overlarge instantaneous current can be prevented, and the continuity of the operation process of the robot is effectively prolonged.

The invention relates to a battery group discharging control method and a battery group charging control method, and belongs to the technical field of new energy automotive power battery application. Aiming at circular current of a parallel-connected battery group, battery packs are connected in parallel after respectively passing through corresponding relays, on / off of each relay is controlled according to voltage sampling on and the specific state of the corresponding battery pack so as to realize charging and discharging control on the battery packs, battery information is transmitted to a finished automobile through a finished automobile CAN, and the finished automobile makes appropriate power request and restrictions according to information sent by a battery management system so as to eliminate or suppress circular current of the battery packs connected in parallel, ensure the maximum output capacity of the batteries and ensure the safety of the batteries and personnel.