83results about How to "Reduced risk of thermal runaway" patented technology

The invention provides a lithium battery. The lithium battery comprises a positive electrode plate, a negative electrode plate, a separator and electrolyte solution, wherein the separator is positioned between the positive electrode plate and the negative electrode plate for defining an accommodating area in which the electrolyte solution is positioned; a thermal actuation protection film is arranged on a material surface of the positive electrode plate or the negative electrode plate; and when the temperature of the lithium battery rises to the temperature for the thermal actuation, which isabout 80 to 280 DEG C, the thermal actuation protection film undergoes cross linking reaction to prevent thermal runaway so as to further prevent the battery from exploding. The invention also provides a manufacturing method for the lithium battery.

The invention belongs to the technical field of power batteries, and especially relates to a power battery top cover and a power battery using the top cover. The power battery top cover comprises a top cover sheet, and a firs pole pillar, a second pole pillar, a pressure release valve, a liquid injection hole, pneumatic overturning sheets and a resistor block, the first pole pillar is in insulation connection with the top cover sheet, the second pole pillar is electrically connected with the top cover sheet through the resistor block, the pneumatic overturning sheets are electrically connected with the top cover sheet, the conductive block is arranged above the pneumatic overturning sheets, a baffle plate is arranged under the pressure release valve, the pneumatic overturning sheets comprise a first pneumatic overturning sheet and a second pneumatic overturning sheet, and the thickness of the first pneumatic overturning sheet is smaller than the thickness of the second pneumatic overturning sheet; and when the pressure in the power battery increases, the pneumatic overturning sheet and the second pneumatic overturning sheet sequentially move upward in order to electrically connect the first pole pillar with the second pole pillar. Compared with power battery top covers in the prior art, the power battery top cover disclosed in the invention makes the power battery have an excellent safety protection function in overcharging, nailing, short circuit and hot box test.

The invention relates to a shielding gas charging battery pack suitable for a new energy automobile. The battery pack comprises a battery pack shell (2) and a battery pack body (1) in the battery packshell (2). The device further comprises a gas cylinder (12), a sensor and an MCU (13), wherein the gas cylinder (12) is filled with protective gas and is communicated with the interior of the batterypack shell (2) through the gas valve (11), the sensor is respectively connected with the battery pack shell (2) and the MCU (13), the MCU (13) is connected with the gas valve (11), and the MCU (13) monitors the state of the interior of the battery pack shell (2) through the sensor and controls the opening and closing of the gas valve (11). Compared with the prior art, the battery pack is filled with protective gas, so that air can be isolated under the condition that the structural weight is not increased, and a flame-retardant effect is achieved; Gas can flow forcibly to enhance the heat dissipation effect; And a gas supplementing system is arranged to cope with gas leakage.

The invention discloses an electrode active material for a lead-acid storage battery. The electrode active material comprises lead powder and composite material granules; the lead powder comprises one or more kinds of metal lead powder, ball-milling lead powder, Barton lead powder, Pb<2>O powder, PbO powder, Pb<2>O<3> powder, Pb<3>O<4> powder and PbO<2> powder; and the composite material granules comprise one or more kinds of coating type composite material granules and mixed type composite material granules. By virtue of the electrode active material for the lead-acid storage battery with an improved formula, the specific power, specific energy, active material utilization rate, charging-discharging efficiency, cycle life, low-temperature performance and the like of the applied lead-acid storage battery can be obviously improved.

The invention relates to the technical field of engineering machinery, and discloses a feedback current control device and an overhead working truck. The feedback current control device comprises a feedback current capturing module, a first switch module and a control module, wherein the feedback current capturing module is located on a current capturing circuit and is used for capturing a feedback current; the first switch module is used for conducting or switching off the current capturing circuit; and the control module comprises a first receiving unit and a first control unit, and the first receiving unit is used for receiving a first voltage at one end of a driver on a power supply circuit, a second voltage at one end of a battery and the temperature of the battery, the first controlunit is used for executing the following operation according to the difference value of the first voltage and the second voltage and the temperature of the battery, under the condition that the difference value of the first voltage and the second voltage is greater than a preset voltage and the temperature of the battery is less than or equal to a preset temperature, the current capturing circuitis conducted by controlling the first switch module, and the feedback current is captured by the feedback current capturing module. According to the feedback current control device and the overhead working truck, the probability of lithium precipitation of the battery and the risk of thermal runaway of the battery can be greatly reduced.

The invention relates to the technical field of engineering machinery, and discloses a lithium battery system and an overhead working truck. The lithium battery system comprises a battery and a feedback current control device, wherein the feedback current control device comprises a plurality of current capture module groups, each module group comprises a heating module matched with the position ofa battery module and used for capturing feedback current, a first switch module used for conducting a current capture branch where the switch module is located, and a control module used for receiving a first voltage and a second voltage on a main circuit and the average temperature of the battery, controlling the first switch module in each current capture module group to switch on the current capture branch in which the first switch module is located when the difference between the first voltage and the second voltage is greater than a preset voltage and the average temperature of the battery is less than or equal to a preset temperature, and converting the feedback current into heat energy by the heating module to heat the corresponding module. According to the invention, the probability of lithium precipitation of the battery and the risk of thermal runaway of the battery can be greatly reduced.

The invention discloses a cylindrical power battery module, and relates to the technical field of power battery heat management. The cylindrical power battery module comprises a ventilating device, breathing pipes, a battery pack top fixing disc, a battery module and a battery bottom fixing disc; the bottom surface of the battery module is fixed to the battery bottom fixing disc; the end of the battery module is fixed to the battery pack top fixing disc; the battery module consists of cylindrical batteries which are arranged neatly in lines and rows; the breathing pipes are mounted at gaps among the cylindrical batteries; through holes are formed in pipe bodies of the breathing pipes; one end of each breathing pipe is closed, and the other end of each breathing pipe is connected with the ventilating device in a closed manner; the ventilating device is mounted at the top of the battery pack top fixing disc; and a temperature sensor is arranged in the battery pack. The cylindrical powerbattery module is applicable to the technical field of power battery heat management, and can effectively reduce the temperature rise of the batteries of the battery pack, and improve the temperaturedifference consistency of various batteries of the power battery module.

The invention relates to a battery cell voltage sampling piece welding quality detection method and a detection device. The detection method comprises the following steps: a voltage drop test step, namely testing whether voltage drop in a welding area of a test object meets preset conditions by adopting a voltage drop method; and a comprehensive assessment step, namely obtaining the final weldingquality according to results obtained in the voltage drop test step. The voltage drop test specifically comprises the following steps: 101) introducing a direct current source between the welding areaand battery cell tabs, and controlling stable output of the direct current source; and 102) measuring voltage drop between the welding area and the battery cell tabs, judging whether the voltage dropmeets the preset conditions, if so, exiting, otherwise generating alarm information. Compared with the prior art, the method disclosed by the invention has the advantages that the welding quality canbe effectively evaluated, thermal runaway risk of the battery module is reduced, and the like.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a solid electrolyte membrane, which is prepared from the following components in percentage by mass:3 to 7% of polyvinylidene fluoride having undergone alkaline washing and drying, 3 to 7% of an in-situ polymerization monomer, 0.03 to 0.07% of an initiator, 10 to 20% of a fast ion conductor, 0.01 to0.05% of a stabilizer, 0.01 to 0.05% of a dispersing agent, 5 to 16% of a lithium salt and 50 to 70% of a first organic solvent. In addition, the invention also relates to a solid-state lithium ion battery and a preparation method thereof. Compared with the prior art, the solid-state electrolyte membrane disclosed by the invention has relatively high ionic conductivity and good stability, and thesolid-state lithium ion battery has good comprehensive performance.

The invention discloses an electric vehicle battery management system and a method for managing a battery by using the same, which can realize the real-time monitoring of the overdischarge of a storage battery and the temperature of a power battery, ensure the normal power supply of the storage battery and reduce the risk that high-voltage kinetic energy cannot be provided. The system comprise a low-voltage power supply module, a high-voltage power supply module and a direct-current transformer DC-DC; a battery management controller BMS is integrated with a power distribution system PDU, an electric heating device and a cooling device are arranged on the outer surface of the power battery, a temperature sensor is electrically connected with the battery management controller BMS, and the battery management controller BMS controls the electric heating device and the cooling device to adjust the temperature of the power battery according to temperature information of the temperature sensor. The battery management controller BMS is in communication connection with a cloud platform through a vehicle machine TBOX, and the method for managing the battery by applying the system comprises astorage battery control management method and a power battery control management method.

The invention provides a battery cell, an assembling method thereof and a connecting sheet. The battery cell comprises: a shell; a roll core arranged in the shell, and a tab being arranged on the rollcore; a cover plate assembly comprising a cover plate and a pole column arranged on the cover plate, and the pole column being provided with a pole column sinking table and a pole column hole penetrating through the pole column sinking table; a connecting piece comprising an ultrasonic welding part of a two-piece type opening and closing structure and a laser welding part of a two-piece type opening and closing structure, and the ultrasonic welding part being connected with the laser welding part. The ultrasonic welding part of the connecting sheet wraps the tab on the roll core, the connecting sheet and the tab wrapped by the connecting sheet penetrate into the cover plate, and the laser welding part of the connecting sheet penetrates through the pole hole and is welded with the pole sinking table. The physical internal resistance of the battery can be reduced, so that the total internal resistance of the battery is reduced, battery heating is reduced, and the safety and the servicelife of the battery are better improved.

The invention provides a protective film and a preparation method thereof, and a lithium ion battery using the protective film, wherein the protective film comprises a base film and a coating coated on the base film, and the coating comprises an insulating material and a binder. The preparation method comprises the following steps: 1) mixing a binder, a solvent and an insulating material to obtainslurry; and 2) coating a base film with the slurry to obtain the protective film. The protective film provided by the invention is an insulating film with high weather resistance and high thermal conductivity, and can effectively reduce the temperature in the battery in the high-current or high-power charging and discharging process of the battery, so that the thermal runaway risk of the lithiumbattery under the working condition is reduced, the safety and reliability of the battery are greatly improved, and the service life of the battery can be prolonged by reducing the temperature in thebattery.

The invention relates to the technical field of engineering machinery, and discloses a lithium battery system and an overhead working truck. The lithium battery system comprises a battery and a feedback current control device, wherein the feedback current control device comprises a first current capture device comprising a first feedback current capture module used for capturing feedback current,a first switch module used for conducting or unidirectionally cutting off a main circuit, and a control module used for receiving a first voltage at one end of a driver on the main circuit, a second voltage at one end of the battery and the temperature of the battery, controlling the first switch module to cut off the main circuit in one direction when the difference between the first voltage andthe second voltage is greater than a preset voltage and the temperature of the battery is less than or equal to a preset temperature, and capturing the feedback current by the first feedback current capture module on the first current capture circuit. According to the invention, the probability of lithium precipitation of the battery and the risk of thermal runaway of the battery can be greatly reduced.

The invention belongs to the technical field of organic synthesis application, and particularly relates to a self-powered continuous nitration method and device. According to the method, a raw material (or a raw material solution) and mixed acid (or nitric acid) are added into a self-powered continuous reactor at the same time, reaction feed liquid continuously and circularly flows, is mixed and reacts in a tube pass through self-propelling force generated by stirring of an impeller, the mass and heat transfer process is completed, and the target requirement is met. According to the invention, the mass transfer and heat transfer efficiency can be improved, the heat exchange and heat transfer capabilities are improved, the reaction time is shortened, the risk degree of art is reduced, the thermal runaway risk is avoided, the reaction safety is improved, and the realization of chemical industry intrinsic safety large scale production is facilitated.

The invention provides an HEV soft package battery cell and a battery pack, the HEV soft package battery cell comprises a battery cell main body and a battery cell tab, the battery cell main body is provided with an aluminum-plastic film shell, and a pole group and an electrolyte which are sealed in the aluminum-plastic film shell, the battery cell tab is provided with a positive pole tab and a negative pole tab, one ends of the positive pole tab and the negative pole tab are positioned in the aluminum-plastic film shell and are connected with pole group, and other ends of the positive pole tab and the negative pole tab extend out of the aluminum-plastic film shell. The battery cell is characterized in that the battery cell main body is of a cuboid structure, the length L of the battery cell main body is smaller than or equal to 250 mm, the width W and the thickness H of the battery cell main body meet the conditions that 20%L <= W <= 60%, and 1%L <= H <= 5%L. According to the HEV softpackage battery cell, the high-rate charging and discharging capacity of the battery cell can be guaranteed, the power performance of the battery cell is guaranteed, the safety performance of the battery cell can also be improved, and the HEV soft package battery cell has good practicability.

The invention discloses diaphragm coating slurry capable of improving the safety performance of a lithium ion battery. The diaphragm coating slurry comprises the following raw materials in parts by weight: 20-35 parts of an inorganic insulator, 0.2-3 parts of a dispersing agent, 3-5 parts of a binder, 0.1-2 parts of a surfactant and 50-80 parts of water. The invention also discloses a preparationmethod of the diaphragm coating slurry capable of improving the safety performance of the lithium ion battery, and the lithium ion battery diaphragm prepared from the diaphragm coating slurry. The coating formed by the diaphragm coating slurry on the surface of the diaphragm can effectively maintain the pore structure in the diaphragm after impact, and ensures that the battery has more uniform lithium ion flow in the charge-discharge process, thereby enhancing the safety performance of the lithium ion battery.

The invention provides a laminated high-capacity lithium battery, and belongs to the technical field of energy storage batteries. The laminated high-capacity lithium battery comprises a pole and a plurality of battery cell bodies; the plurality of battery cell bodies are connected in parallel through the pole, the pole is provided with a heat conduction assembly and a refrigeration / heating assembly, and the refrigeration / heating assembly refrigerates or heats the plurality of battery cell bodies through the heat conduction assembly. According to the laminated high-capacity lithium battery disclosed by the invention, the refrigeration and heating functions required by the high-capacity lithium battery during working are realized.

The invention provides a functional material, a positive plate containing the functional material and a lithium ion battery. Different from a traditional lithium ion battery, the lithium ion battery disclosed by the invention contains 0.01 to 1wt% of functional material. According to the functional material, a polymer directional design coating method is adopted, and a polymer material which is relatively stable with an electrolyte and can conduct oxygen is screened; a solid phase coating method is used for coating the surface of the core-forming material comprising the reducing material withthe shell-layer-forming material comprising the polymer material so as to prepare the functional material. According to the functional material, on the premise that the performance of the lithium ionbattery is not affected, oxygen separated out of the positive electrode material can be effectively adsorbed in the lithium ion charging and discharging process, and the performance of the lithium ionbattery can be effectively improved.

The invention discloses a battery emergency disconnection system based on accurate measurement. The battery emergency disconnection system comprises a high-voltage electric load, a processor unit anda battery, wherein the battery is electrically connected with a burning explosion type fuse and a copper bar; the burning explosion type fuse is electrically connected with a high-voltage electric load through the processor unit, the copper bar is electrically connected with a temperature sensor through the processor unit, meanwhile, the copper bar and the temperature sensor are electrically connected with a relay, and the relay is electrically connected with the high-voltage electric load. According to the battery emergency disconnection system, the loss of charging and discharging of the battery is reduced through an alternative scheme, the action time of the fuse is prolonged, the current coverage range of the fuse for battery protection is increased, and the thermal runaway risk of thebattery due to overcurrent is reduced.

The invention provides a polymer electrolyte, a preparation method thereof and application of the polymer electrolyte in a solid-state battery. Monomers of the polymer electrolyte comprise a cyclopentene structural monomer and an active hydrogen structural monomer, a main chain of the polymer comprises a cyclopentene structure and an active hydrogen group, and the polymer electrolyte is obtained by in-situ polymerization and curing of the cyclopentene structural monomer, the active hydrogen structural monomer, an initiator, a cross-linking agent and an electrolyte. The polymer electrolyte has excellent thermal stability, and can generate a chemical integrated interface with an electrode in a battery curing stage, so that the interface performance is improved. The in-situ polymerization curing method is adopted to prepare the in-situ curing electrolyte, so that the interfacial compatibility of the solid-state battery is improved, the manufacturing cost of the solid-state battery is reduced, and the performance of the solid-state battery is improved.

The embodiment of the invention provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode assembly, the electrode assembly comprises a first pole piece, a second pole piece and an isolating membrane, and the isolating membrane is arranged between the first pole piece and the second pole piece; and the isolating membrane is provided with a through hole, one side, facing the first pole piece, of the through hole is provided with thermal shrinkage gummed paper, one side, facing the second pole piece, of the through hole is provided with a thermosensitive layer, the thermal shrinkage gummed paper is used for keeping insulation between the first pole piece and the second pole piece before thermal shrinkage, and the impedance of the thermosensitive layer is increased along with temperature rise. According to the electrochemical device, the electric energy of the electrochemical device can be controllably converted into heat energy, short-time large-current discharge is avoided, the thermal runaway risk of the electrochemical device caused by large-amount heat production in a short time is reduced, and the use safety of the electrochemical device is improved.

The invention provides an electrode pole piece and a preparation method and application thereof, the positive pole piece comprises a current collector and an active substance layer arranged on the surface of the current collector, the active substance layer comprises an active material, a conductive agent, a binder and a fluorophosphazene additive, and the oxygen index of the binder is gt; according to the invention, the oxygen index gt is adopted; the 95% high-flame-retardant resin binder has a high flame-retardant characteristic and is uniformly distributed in the pole piece, so that the high-flame-retardant fluororesin binder quenches a fire point in the first time under the condition that the battery is abused, the occurrence of thermal runaway in the battery is avoided, the risk of thermal runaway caused by internal short circuit after the battery is abused is greatly reduced, and the service life of the battery is prolonged. And the fluorophosphazene additive forms a stable SEI film on the surface of the positive electrode material during the first formation, so that the side reaction of the electrolyte and the high-nickel ternary positive electrode is inhibited, the service life of the battery is prolonged, and the safety of the battery is improved.

The invention relates to a solid polymer electrolyte, and more particularly to a solid polymer electrolyte containing a sulfonic acid or phosphoric acid derivative structure and its application in a secondary lithium battery. The polymer in the solid electrolyte contains a sulfonic acid or phosphoric acid derivative structural unit, can be flame retarded, thereby reducing the risk of thermal runaway of the battery, and has a wide electrochemical window, and can be applied to a high voltage lithium battery. The invention also provides an application example of the above polymer electrolyte in a secondary lithium battery.

The invention discloses a switch magnetic resistance motor controller based on a synchronous rectification technology. The controller comprises a microprocessor, a first and gate, a first nand gate, a current sampling circuit, a sample amplification circuit, a magnetic resistance motor position sensor and a power transformer. In a motor operating stage, the microprocessor determines a currently switch-on phase by analyzing a signal from the switch magnetic resistance motor position sensor, and simultaneously determines the current state of the current according to the sample amplification signal of the sample amplification circuit. The microprocessor controls an upper and a lower follow current MOS (Metal oxide semiconductor) tube in the power transformer according to the state of the switch magnetic resistance motor position and the state of the current. The controller disclosed by the invention can utilize a MOS tube groove to provide a follow current channel in a switch magnetic resistance motor winding and follow current stage, and generates smaller switch-on loss than existing diode follow current technology, thus energy loss and power transformer temperature rise are reduced, the system is more reliable and safer, follow current tube low temperature effect is achieved, and the reliability and safety of the system are improved.

The invention relates to the field of lithium batteries, in particular to a lithium battery positive electrode current collector, a preparation method thereof, a lithium battery and a positive electrode thereof. The positive electrode current collector comprises a polymer film, aluminum metal areas are arranged on the side faces of the two sides of the polymer film, aluminum metal layers are arranged on the aluminum metal areas, and the area of the aluminum metal layers is 40-70% of the area of the polymer film. The lithium battery provided by the invention adopts the positive electrode current collector, so that the energy density of the lithium metal battery is improved, the stripping and falling probability of the positive electrode active material is also reduced in the charging and discharging processes of the battery, the cycle life of the battery is further prolonged, in addition, the condition of micro short circuit of the lithium battery is further reduced, and the safety performance of the lithium battery is improved.

The invention belongs to the technical field of batteries and relates to an anodic oxidation solution, a battery shell, an insulation protection method of the battery shell and application of the anodic oxidation solution. The battery shell provided by the invention comprises a shell body and a protective layer arranged on the surface of the shell body, and the protective layer is made of a composite material formed by aluminum oxide and polyaniline. According to the battery shell provided by the invention, the insulating property and the corrosion resistance of the battery shell can be greatly improved.

A semiconductor device. In a discrete bipolar transistor with two layers of electrode structures, the emitter electrode in a first layer and the emitter region are connected via emitter contact holesof a first insulated film formed therebetween. The emitter electrode in the second layer and the emitter electrode in the first layer are connected via emitter through holes of a second insulated filmformed therebetween. Accordingly, the emitter contact holes and the emitter through holes are overlapped under the emitter electrode in the second layer so as to generate a height difference of a thickness of two insulated films. The height difference influences the surface of the emitter electrode in the second layer, thus producing bad adhesion owing to large bump when a metal sheet is bound onthe surface with a solder. Emitter contact holes formed under the emitter electrode in the first layer and emitter through holes formed thereon are arranged so as not to overlap each other, and, foreach emitter electrode, the multiple emitter contact holes and the multiple emitter through holes are provided so as to be separated from each other. Thereby, the top surface of an emitter electrode in a second layer is influenced by at most only a height difference of each emitter through hole formed in an insulated film having a larger thickness, and thus the flatness of the top surface of the emitter electrode in the second layer is improved. Accordingly, fixation failure of a metal sheet can be avoided.

The invention provides an aluminum-coated positive electrode material capable of inhibiting oxygen release and a battery comprising the aluminum-coated positive electrode material. The aluminum-coated positive electrode material comprises positive electrode active particles and an aluminum layer coated on the surfaces of the positive electrode active particles. According to the invention, the surface of the positive active particle is coated with the aluminum layer, and by utilizing the reducibility of the metal simple substance aluminum, when the battery is in thermal runaway, the positive active particle is decomposed to release oxygen, and the metal simple substance aluminum coated on the positive active particle can reduce oxygen to form a metal oxide, namely, aluminum oxide; the ignition of the combustible electrolyte under the condition that the released oxygen accumulates heat is avoided, and the risk of thermal runaway of the battery is effectively reduced. The metal simple substance aluminum has high electrical conductivity, the electrical conductivity of the positive electrode material can be improved, meanwhile, aluminum oxide is generated after the metal simple substance aluminum absorbs oxygen, the aluminum oxide is gradually lithiated in the charging and discharging process to form a fast ion conductor, the ionic conductivity of the positive electrode is improved, and the cycle life of the battery is prolonged.

The invention relates to the field of batteries, and provides a unit module and a battery pack. Each unit module comprises at least one soft package battery cell and a shell assembly, an accommodating cavity for accommodating each soft package battery cell is formed in the shell assembly, and an exhaust hole for communicating the accommodating cavity to the outside is formed in one side, in the height direction of the soft package battery cell, of the shell assembly. Based on the structure, a unit module which is regularized, modularized, independent, better in strength and better in rigidity can be formed. No matter the position where thermal runaway happens to the soft package battery cell in the shell assembly is located at the tab, the edge sealing position or other positions of the soft package battery cell, heat and gas discharged by the soft package battery cell with thermal runaway are directionally discharged out of the unit module along the exhaust holes. Therefore, the battery pack can take thermal runaway protection measures based on directional exhaust path pre-design, the risk / speed of thermal runaway spreading to other unit modules can be reduced when a certain unit module is in thermal runaway, and the safety performance of the battery pack can be guaranteed and improved.

The invention discloses a battery pack integrated with vehicle body functions and a vehicle. A vehicle body framework is provided with a tray structure; a containing cavity is formed between the floor and the tray structure; the battery module consists of a plurality of battery cells and is arranged in the accommodating cavity; the air duct is provided with an air inlet and a battery air outlet, the battery air outlet is formed in the containing cavity, at least part of the air duct body is arranged in the containing cavity, and the air inlet is connected with a whole vehicle air conditioning system; the battery pack is integrated with the vehicle body, the arrangement space of the battery pack is increased, the battery pack and the seat cabin share the warm air system, so that the heat management system and the vehicle body function are highly integrated, the internal space of the battery pack is optimized, and the cost is reduced; the arrangement of internal and external wiring harnesses of the battery pack is reduced; the battery management system selects an electricity taking object as a battery cell containing thermal runaway, so that the battery cell within the electricity taking range is rapidly discharged, and the risk of thermal runaway is reduced.