229results about How to "Avoid the risk of short circuits" patented technology

The invention provides a lithium double-fluid flow battery, which comprises a porous positive current collector, a positive reaction cavity, a diaphragm, a metal lithium negative plate, a negative reaction cavity, a positive suspension and a negative electrolyte, wherein a gap with a certain distance exists between the diaphragm of the battery and negative metal lithium; the gap is fully filled with the negative electrolyte which continuously or intermittently flows; and a solid-liquid composite dual-diaphragm structure is formed by the diaphragm and the negative electrolyte. Through continuous or intermittent washing by the electrolyte, the problem of potential safety hazards caused by lithium dendrites generated by a metal lithium negative electrode in charge-discharge processes is solved; and meanwhile, the lithium double-fluid flow battery plays roles in purifying the negative electrolyte, cleaning the diaphragm and adjusting the concentration of the positive suspension.

The invention provides a magnetic core material, and a preparation method and an application thereof. The magnetic core material comprises a first magnetic powder, a second magnetic powder and a third magnetic powder which are bonded and mixed by a binder. The preparation method comprises the following steps: (1) mixing the first magnetic powder, the second magnetic powder and the third magnetic powder to obtain a ternary magnetic powder; (2) passivating the ternary magnetic powder obtained in the step (1) to obtain a passivated magnetic powder; (3) coating the passivated magnetic powder obtained in the step (2) to obtain a coated magnetic powder; (4) bonding and granulating the coated magnetic powder obtained in the step (3) to obtain magnetic particles; and (5) carrying out compression molding on the magnetic particles obtained in the step (4) to obtain the magnetic core material. The magnetic core material provided by the invention has the characteristics of low forming pressure, high magnetic conductivity and low loss, and the short-circuit risk of a molded inductor is reduced.

The invention discloses an array substrate, a display device and a manufacture method of the array substrate. The array substrate comprises an IC crimping region including an IC region and a terminal region arranged on one side of the IC region and near an edge of the array substrate. The terminal region is provided with a plurality of transmission terminals. The IC region comprises a conductor layer, a first insulating layer, a separating layer and a second insulating layer stacked one by one. Each transmission terminal comprises a first conductive layer which is arranged on the second insulating layer and extends from the terminal region to the IC region. The separating layer is arranged in the IC region and at least overlaps with the first conductive layers extending to the IC region. When a small-size IC chip is adopted, contact failure between the IC chip and the terminals of the array substrate can be prevented. Meanwhile, short circuit risks between the first conductive layers and the conductor layer can be avoided.

The invention discloses a soft cell-packaged battery. The soft cell-packaged battery comprises an upper cover, a soft cell, a lower cover and a support, wherein the soft cell-packaged battery comprises a soft cell body, a first lead and a second lead, the end portions of the first lead and the second lead are arranged on the lower portion of the circumference of the soft cell body, and the free ends of the end portions of the first lead and the second lead extend outwards; the soft cell package is arranged inside the support, the free end of the first lead is fixedly connected to the upper cover or the lower cover, the free end of the second lead is fixedly connected with the lower cover or the upper cover, the upper cover is fixedly connected in a sealed mode to the top of the support, the support is arranged inside the lower cover, and the upper end of the circumference of the lower cover abuts against the outer circumferential wall of the upper end of the support. The soft cell-packaged battery reduces the risks of corrosion of the upper cover and the lower cover as well as leakage of electrolytes, prolongs the service life and meanwhile avoids potential risks of short circuit,thereby improving safety, avoiding producing electromagnetic interference signals, avoiding electromagnetic interference to products applying the soft cell-packaged battery, and further improving theproduct quality and user experience.

The invention is applicable to the technical field of connector structures and discloses a connector and a terminal device comprising same. The connector comprises a base and a casing which connects the base; the base comprises an insulating body and a terminal which connects the insulating body; the terminal comprises a connecting piece and an elastic piece which are connected to the insulating body; the tail end of the elastic piece is integrally formed in the connecting piece; a folding portion is integrally formed in the connecting piece in a bending mode; the folding portion is arranged below the front end of the elastic piece; the insulating body is provided with an upper end surface which is used for being pasted on a digital card; the middle portion of the elastic piece protrudes the upper end surface of the insulating body; the front end of the elastic piece is lower than the upper end surface of the insulating body. The terminal device comprises a device body; the device body is internally provided with a circuit board; the circuit board is connected with the above connector. The connector and the terminal device comprising the same are good in product reliability.

The invention provides a flat wire stator winding structure of a motor. The structure comprises a stator iron core with multiple stator grooves, and each phase of winding that is formed by winding a flat wire on the stator iron core, wherein each phase of winding comprises at least one winding unit, and each winding unit comprises a first U-shaped coil and a second U-shaped coil. In part of or allthe second U-shaped coils, all the second U-shaped coils are sequentially and continuously arranged along the circumferential direction of the stator iron core, and one of the second U-shaped coil isplaced on the inner side of the corresponding first U-shaped coil to form a first sub-unit. The flat wire stator winding structure of the motor mainly solves the problem that in the prior art the most consumed coils with different spans are greatly different in ratio, under the primes of ensuring that the conductors in the grooves are invariably divided according to the phase spread, and can improve the problem that the space between the coils at the end part of the non-welding side is tight.

The invention provides a refrigerator. The refrigerator comprises an inner container, an air flue, an evaporator and a draught fan; a storage chamber is limited in the inner container, the air flue extends in the inner container from bottom to top along the rear wall of the inner container, the evaporator is arranged on the outer side of the rear wall of the inner container, and is configured to indirectly cool air in the air flue, the draught fan is arranged in the air flue and located on the lower portion of the air flue, and is configured to promote air, cooled by the evaporator, in the airflue to flow into the storage chamber. According to the refrigerator, the draught fan is arranged on the lower portion of the air flue, the evaporator is arranged on the outer side of the rear wall of the inner container, when wet air passes through the refrigeration area of the evaporator through the air flue, the wet air exchanges heat with the face of the rear wall of the inner container, dueto the fact that the temperature of the face of the rear wall of the inner container is higher than the temperature of the evaporator, the frost quantity of wet air is reduced, it is ensured that muchwater steam is brought into the storage chamber, the phenomenon that most part of the water steam is frozen by the evaporator and forms frost is avoided, the humidity of the storage chamber is improved, humidity of the food in the storage chamber can be conveniently stored, and food can be prevented from being air dried.

The invention discloses a floating gate preparation method. The method comprises steps: S1, a shallow trench isolation structure whose upper surface is higher than the first height H1 of the upper surface of a semiconductor substrate is formed on a semiconductor substrate; S2, an active region is formed on the semiconductor substrate through ion implantation; S3, a tunnel oxide layer is formed on the semiconductor substrate; S4, a floating gate material layer is deposited on the tunnel oxide layer; S5, the floating gate material layer is flattened to enable the upper surface of the shallow trench isolation structure to be exposed; and S6, part of the shallow trench isolation structure is removed by etching to form the floating gate. S6 further comprises steps of adopting wet etching to remove the shallow trench isolation structure with a second height H2 to enable coupling efficiency between the floating gates and control gates formed subsequently to be high, and adopting dry etching to remove the shallow trench isolation structure with a third height H3 to form the floating gates. When the technical scheme of the invention is applied, the coupling efficiency between the floating gate and control gates formed subsequently is high, and the risk of short circuit between the active region and the control gates can be avoided.

The application relates to a secondary battery current collector. All or a part of the surface of the current collector is provided with a coating layer containing a polymer, inorganic particles and abinder. Micropores are disposed on the surface of the coating layer and in the coating layer. Since the coating layer contains the polymer and the inorganic particles, a porous net structure can be formed, which supports the surface of the current collector, and ensures the strength of the current collector. When the coating layer is disposed in a tab portion, the problem can be solved that the tab is likely to break and the risk of short circuit occurring in a battery due to the break of the tab can be avoided.

The invention discloses a bend-type outgoing line high-voltage shielding electric connector plug. The protection grade of an outer shell of a traditional large current bend-type outgoing line plug hardly reaches the standard. An outer shell of the plug of the invention comprises an outgoing line part and a plugging part. A switchover shield is sleeved and arranged in each switchover shield installation groove of the outgoing line part. A switchover sheath is sleeved and arranged in each switchover shield. A wiring terminal is sleeved and arranged in each switchover sheath. Each switchover shield is in contact with a shield outer sleeve through a spring on the inner wall of the switchover shield. A shield inner sleeve is sleeved and arranged in each shield outer sleeve. A plugging shield is fixedly sleeved and arranged in each plugging shield assembling hole of the plugging part. A plugging column is sleeved and arranged in each plugging shield. The head part of each plugging column extends into a corresponding plugging column positioning hole of the outer shell of the plug. Screw threads of each plugging column are connected with a screw thread hole of the corresponding wiring terminal, and a conical surface of each plugging column is connected with a conical hole of the corresponding wiring terminal. According to the invention, the small-size internal bend-type outgoing line can be realized and the short circuit between lead wires and cable shielding layers can be prevented.

The invention provides a rotary transformer and a rotating body equipped with same, and belongs to the technical field of detection. The rotary transformer comprises a stator and a rotor, wherein the stator comprises a stator yoke and stator detection teeth, and the stator detection teeth are arranged on the stator yoke; the spanning angle of the stator yoke is smaller than 360 degrees; the rotor comprises a rotor iron core; rotor salient poles are arranged on the surface of the rotor iron core; the number of the stator detection teeth is 4*K, wherein K is a positive integer; the number of the rotor salient poles is N, wherein N is a positive integer; each stator detection tooth is at most wound with a coil; the rotary transformer comprises at least one set of detection coil system; each detection coil system comprises a plurality of coils wound around the stator detection teeth; inductance of the coils is changed along with changes of the rotating angles of the rotor; and the rotating body comprises a rotating body main body and the rotary transformer, wherein the rotary angle of the rotating body main body and the rotary transformer are in a regular relationship. The miniaturization and light weight of the rotary transformer are promoted; and in addition, winding and line connection are simpler and more effective.

The invention provides an impact-resistant battery pack. A first buffering device and second buffering devices are arranged between an inner box and an outer box, so that the condition that battery cells in the battery pack is prevented from being damaged when the battery pack is bumped and impacted is ensured due to the buffering effect of buffering grids and springs, and thus service life is prolonged and cost is saved. Flexible connection of a plurality of battery cell support units is achieved via cooperation of splicing blocks and splicing grooves and cooperation of first installation grooves and I-shaped blocks, replacement efficiency of the battery cells is improved, and meanwhile each battery cell is separated from another one by using the battery cell support unit, so that a short circuit risk caused by broken skin of the battery cells is avoided; two bottom frames are connected by an upper support arm and a lower support arm to form a stable support structure, and thus mechanical strength of the battery cell support is improved.

The invention relates to a composite diaphragm for an alkali metal battery and a preparation method of the composite diaphragm. The composite diaphragm comprises an organic diaphragm matrix layer coated with a ceramic coating and an amorphous alkali metal ion conductor inorganic solid layer, and the preparation method is a vacuum physical deposition method and comprises the following steps of passing an organic diaphragm substrate through a vacuum deposition cavity in a roll-to-roll mode, wherein the vacuum degree of a vacuum box body is 0.5-5 Pa, the reaction gas is nitrogen, the deposition power supply power is 30-180 W, the deposition time is 5-30 min; and depositing to prepare the composite diaphragm. The deposited inorganic solid layer is compact and non-porous, so that the diaphragmhas very strong mechanical property and high-temperature resistance, and the internal short circuit caused by the battery impurities and the metal dendrites and the thermal deformation of the batterydiaphragm can be effectively prevented. Meanwhile, the inorganic solid layer has the alkali metal cation high-speed conduction performance, stability in air and a hetero-ion blocking function, so thatthe safety performance and the cycle life of the battery can be remarkably improved.

The invention provides a solid polymer electrolyte comprising a three-dimensional graphene oxide network and a polymer and lithium salt electrolyte filled in the three-dimensional graphene oxide network; The polymer is one or more of PEO, PAN, PVDF, PMMA and PVDF-HFPs; The lithium salt electrolyte is one or more of LiTFSI, LiPF6 and LiCIO4; The polymer has an electron donating functional group, and the molar ratio of the electron donating functional group to lithium ions in the lithium salt is (1-10): 1. The three-dimensional graphene oxide network surface of the invention can form a continuous amorphous region, which is favorable for lithium ion transmission and improves the ionic conductivity of the solid polymer electrolyte. The prepared polymer electrolyte has high ionic conductivity,good mechanical strength and excellent safety performance. The invention also provides a preparation method of a solid polymer electrolyte and a lithium ion battery.

A battery cell comprises: an electrode assembly, wherein the outer surface of the electrode assembly comprises a first surface, a first end face and a second surface in sequence, the first surface is opposite to the second surface, the electrode assembly comprises a first pole piece and a first pole lug, one end of the first pole lug is electrically connected with the first pole piece, the other end of the first pole lug penetrates out of the first end face, and in the thickness direction of the electrode assembly, the first tab extends towards the second surface and sequentially forms a first bending part and a second bending part, the bending directions of the first bending part and the second bending part are opposite, and a groove is formed in the second bending part in the direction facing the first surface; and a first insulating part, wherein the first end of the first insulating part surrounds the surface, deviating from the groove, of the second bending part, the second end of the first insulating part extends to be close to the first bending part from the second bending part, and the second end of the first insulating part exceeds the corresponding end part of the first bending part in the direction opposite to the penetrating-out direction of the first tab. The invention also relates to a battery and electric equipment. By adopting the battery cell, the condition of short circuit caused by contact between the tab and a pole piece with another polarity when the tab is inserted can be improved.

The invention discloses a metering junction box for avoiding misoperation. The metering junction box comprises a shell and a seal cover located at the upper portion of the shell, a plurality of barrier walls are arranged in the shell at equal intervals, and a plurality of voltage wire spacing grooves are arranged in the shell, a voltage connecting sheet is arranged between every two adjacent barrier walls at intervals, a connecting hole group is arranged between every two adjacent voltage connecting sheets, the metering junction box is provided with copper columns, when the metering junction box is used, contact knives on the voltage connecting sheets are directly clamped in the grooves on the copper columns, and then if the voltage connecting sheets need to be untied for operations such as meter changing and the like, it is only needed to directly pull the corresponding voltage connecting sheet without spending time to screw two screws, which avoids the risk of short circuit caused bymistake touch of the circuit beside the screw when the screws are unscrewed, and simultaneously when the operations such as meter replacement and the like are finished, if a user forgets to recover the voltage connecting sheets, the seal cover cannot be connected due to the blocking of the erected connecting sheet, so that the risk prevention effect is further achieved.

The invention discloses a black box logic verification method for physical chip layout. The method includes the steps: firstly, performing BLACK BOX LVS (layout versus schematic) checking for a chip; secondly, finding process metal layer information and keep-out layer information; thirdly, identifying position and name of each IP (internet protocol) of the other side in the chip; fourthly, extracting a keep-out layer of each IP of the other side to obtain a first data set; fifthly, extracting metal layer information in the chip, and rejecting the internal metal layer information of each IP of the other side in the chip by the aid of the name of each IP of the other side obtained in the third step so that a second data set is obtained; sixthly, subjecting the first data set and the second data set to 'logical conjunction'; and seventhly, comparing 'logical conjunction' results to find out short dots. The step of BLACK BOX upper metal connectivity verification checking is added after a user performs BLACK BOX LVS for the chip, and accordingly risk of short circuit of customer circuits and the IPs of the other side can be avoided.

The present invention provides a rotary transformer and a rotation body with the same and belongs to the detection technical field. The rotary transformer comprises a stator and a rotor, wherein the stator is provided with stator detection teeth, and the rotor is provided with salient poles; the rotary transformer comprises at least two sets of detection coil systems; each set of detection coil system includes a plurality of coils wound on the stator detection teeth; inductance on the coils changes with the rotation angle of the rotor, so that the rotation angle of the rotor can be detected according to the change of the inductance of the coils; and the at least two sets of detection coil systems are arranged on the same stator. The rotation body includes a rotation main body and the above rotary transformer; and the rotation angle of the rotary transformer is in regular relation with the rotation angle of the rotation main body. According to the rotary transformer and the rotation body with the same of the invention, the at least two sets of detection coil systems can be arranged on one rotary transformer, and therefore, restriction between detection occupancy size and the reliability of detection results can be alleviated, and the reliability of the detection results can be improved, and the occupancy size can be greatly decreased.

The invention relates to the technical field of photovoltaic power generation equipment, and provides a fixed mount integrated with swinging and cleaning used for a photovoltaic plate. The fixed mountintegrated with swinging and cleaning used for the photovoltaic plate comprises a base, a rotating column, a swinging plate and a fixed mount, wherein the rotating column is vertically and rotatablyarranged on the base, and a first steering engine for driving the rotating column to rotate is arranged on the rotating column; one end of the swinging plate is hinged onto the rotating column, and asecond steering engine for driving the swinging plate to swing is arranged on the swinging plate; the fixed mount is mounted on the other end of the swinging plate; a scraping device for a reciprocating motion is arranged on the fixed mount; and a follow-up ash removal mechanism is further arranged on the scraping device. According to the fixed mount integrated with swinging and cleaning used forthe photovoltaic plate, the technical fields of automatic swinging angle adjustment and surface cleaning for the photovoltaic plate are realized.

A display panel is defined with a display region and a non-display region, wherein the non-display region is arranged outside the display region, the display panel comprises a substrate, a plurality of bonding terminals and an organic layer, wherein the bonding terminals are arranged on the substrate at intervals and are arranged at the non-display region, an organic layer is arranged on the substrate and comprises a first boundary, the first boundary is arranged at the non-display region and is arranged at outer sides of the bonding terminals, a plurality of parallel grooves are formed in theorganic layer along the first boundary, and at least one groove is formed between two adjacent bonding terminals. The display panel has the beneficial effects that the plurality of grooves are formedin an edge, near to a cutting way, of the organic layer, so that residual metal generated by the subsequent metal process is non-continuous, the panel short-circuit risk is effectively prevented, andthe yield of the panel is further improved.

A battery shell assembly includes a post terminal and a first shell, the first shell comprises a first shell part and a second shell part connected with the first shell part, the first shell part is arranged in a protruding mode relative to the second shell part and defines a containing space, and the post terminal is fixed to the first shell part and partially contained in the containing space. The invention also provides a battery with the battery shell assembly.

The invention discloses a refrigerator which comprises an inner container, an air flue, an evaporator and a fan. A storage chamber is defined in the inner container, the air flue is located on the inner edge of the inner container, the rear wall of the inner container extends from bottom to top, the evaporator is arranged to cool air in the air flue, and the fan is arranged in the air flue, located on the lower portion of the air flue and used for promoting air in the air flue cooled through the evaporator to flow into the storage chamber. According to the refrigerator, the fan is arranged onthe lower portion of the air flue, and the problems that large space is occupied and the refrigerator aesthetic sense is affected if the fan is arranged on the upper portion of the air flue are avoided.

The invention discloses a method for solving short circuit of a signal through hole and a packaging bonding pad. An electronic component is connected on a PCB (Printed Circuit board), a large bonding pad at the bottom of the electronic component is equal to the packaging bonding pad in size, and a distribution prohibiting area at which a through hole is not allowed to be punched is arranged at the periphery of the packaging bonding pad of the electronic component. When the through hole is punched in the arranged distribution prohibiting area, errors are reported, or the through hole can not be punched, the risk of short circuit of the through hole and the packaging bonding pad of the electronic component can be prevented, and the method is suitable for the design of all the bonding pad components.

The invention provides an angle detection device, a rotating body and a motor system, which belongs to the technical field of detection. The angle detection device comprises a rotation angle detection device and a signal processing device. The rotation angle detection device comprises at least one set of detection coil system. Each set of detection coil system comprises at least four rows of multi-arm bridge circuits which are connected in parallel and are composed of a number of coils. Two lead wires are led out from two contacts, which are connected in parallel, of the multi-arm bridge circuits and are used as excitation leads. A lead wire is led out from each contact of upper and lower arms of each row of arms leads and is used as a signal lead wire. The signal processing device comprises an excitation circuit, a signal collection circuit and an angle calculation circuit. The differential signals of two signal lead wires and the differential signals of other two signal lead wires vary with the rotation angle of a rotor. The rotating body comprises the angle detection device and the rotating body. According to the invention, the measuring accuracy and the reliability are high; signal processing and calculating can be effectively carried out on an inductive rotation transformer; and the structure is simple.

The invention discloses a flexible package lithium ion battery flanging forming device. The device comprises a battery cell platform; convex edges, comprising a left convex edge, a right convex edge and a rear convex edge, the left convex edge, the right convex edge and the rear convex edge enclosing a battery cell clamping groove on the battery cell platform, and a lifting mechanism being arranged on the rear convex edge to drive the rear convex edge to reciprocate up and down; a folding mechanism, comprising a pressing plate which is propped against the rear convex edge when moving to the bottom end; a vertical folding block, used for bending the aluminum-plastic film downwards; a horizontal folding block, used for bending the aluminum-plastic film in the horizontal direction; a fixing plate, used for fixing the battery cell on the battery cell platform; a control system, comprising a controller, a memorizer and a control panel, and the control system being used for controlling the lifting mechanism, the pressing plate, the vertical folding block and the horizontal folding block to move. The device has the characteristics of being suitable for soft package lithium ion batteries of different sizes, consistent in folding width and the like.

The invention provides an automobile generator stator structure which is applied in the technical field of automobile generators. The automobile generator stator structure is configured such that a stator core (1) is provided with iron core grooves (4) thereon. Each insulating winding (2) has winding copper wires (5) which are wound within iron cores (4). The winding copper wires (5) and each iron core groove (4) are provided with a groove insulation paper (6) therebetween. Each groove insulation paper (6) is provided with an installation opening (7) thereon. The installation opening (7) is provided with an isolation rib (8) in the middle part of the installation opening (7). According to the invention, different groups of winding copper wires within the groove insulation paper (6) can be effectively isolated, so that even when insulating varnish on an external surface of the winding copper wire drops or when there is a scratch or the groove insulation paper is damaged, contact between different winding copper wires can be effectively avoided, and the risk of short circuit among turns of the different winding copper wires can be avoided.

The invention discloses a display panel and a display device. The display panel comprises a display area, a non-display area arranged around the display area, an array substrate, an opposite substrateand a conductive connection part, wherein the array substrate comprises at least one first circuit area, the first circuit area and the display area are arranged in a first direction, and the first circuit area comprises a plurality of first bonding pads; the first circuit area is disposed adjacent to the opposite substrate in the first direction; the conductive connection part comprises a firstconnection part, a second connection part and a third connection part, the first connection part is arranged on one side surface of the array substrate close to the opposite substrate, the second connection part is electrically connected with the opposite substrate, the second connection part is electrically connected with the first connection part through the third connection part; an orthographic projection of the conductive connection and the orthographic projection of a first bonding pad do not overlap in a plane perpendicular to the first direction. Compared with the prior art, electrostatic charge on the opposite substrate can be led out through the conductive connection part, so that the display effect is improved.

The utility model relates to the lithium ion battery field, and discloses a cathode piece for a lithium ion battery and the lithium ion battery. The cathode piece comprises a metal current collector, a carbon layer is coated on the surface of the metal current collector, and a lithium hypovanadate layer is coated on the surface of the carbon layer. By means of the cathode piece, the avoidance of diaphragm piercing is facilitated, and the internal short-circuit rate of the lithium ion battery is reduced.

An electrochemical device includes a housing, an electrode assembly, a first bonding piece, a second bonding piece, and a third bonding piece. The electrode assembly comprises pole pieces and an isolating membrane. The pole pieces comprise a first pole piece and a second pole piece, and the isolating membrane is arranged between the first pole piece and the second pole piece. The electrode assembly is of a winding structure and is arranged in the shell. In the winding direction, the electrode assembly comprises a first section, a first bent section, a second section and a second bent section, wherein the outermost ring of the first section is the isolating membrane. The electrode assembly includes a first end portion and a second end portion opposite to each other in a winding center axis direction. The first bonding piece is bonded with the outer surface of the first bent section and the tail part of the isolating membrane; the second bonding piece is bonded on the outer surface of the second bent section and is bonded on the tail part of the first pole piece; and the third bonding piece is arranged at the first end part and is bonded with the outer surface of the isolating membrane at the outermost ring of the first section and / or the outer surface of the pole piece at the outermost ring of the first section. The security is improved. The invention further provides an electronic device.

The invention provides a roll core assembly structure and method. The roll core assembly structure and method are used for assembling a roll core, and the roll core comprises a roll core body and a tab extending from the roll core body. The assembly structure comprises: a partition plate assembly comprising a partition plate body, wherein the partition plate body comprises a top wall and at least one side wall, the top wall and the side walls define a containing part used for containing the roll core body, and the partition plate assembly further comprises a connecting piece arranged on the top wall and having conductivity; and a cover plate assembly including a substrate having a first surface and a second surface, a conducting strip arranged on the first surface and used for being connected with the connecting strip, and a pole arranged on the second surface, wherein the pole is electrically conducted with the conducting strip. According to the specification, the manufacturing qualification rate can be improved, and multi-roll core assembly can be carried out.