Abstract: A prismatic secondary battery includes an electrode body including a positive-electrode sheet and a negative-electrode sheet, a prismatic exterior body that accommodates the electrode body, a sealing plate that seals an opening of the prismatic exterior body, and a negative terminal electrically connected to the negative-electrode sheet. The positive-electrode sheet is electrically connected to the sealing plate. The sealing plate has a recessed portion on an outer surface and a terminal insertion hole formed in the recessed portion. The negative terminal is inserted in the terminal insertion hole. An outer insulating member is disposed between the negative terminal and the sealing plate. The sealing plate has a first groove extending to an end of the recessed portion in the longitudinal direction of the sealing plate.

Abstract: A battery pack includes a casing, a battery cell assembly, an encoder, and a monitoring unit; the battery cell assembly is disposed in the casing; the encoder is adapted to generate one of a plurality of types of encoding configurations, and includes an operating section which is adapted for a user to set one of the encoding configurations of the encoder manually; the monitoring unit is adapted to sense a state of the battery cell assembly and generate an identification code according to the encoding configuration of the encoder; wherein, the monitoring unit is further adapted to output a state signal which includes the aforementioned identification code. Whereby, the battery pack of the present invention would be a universal battery pack.

Abstract: A solid-state lithium-based battery is provided in which the formation of lithium islands (i.e., lumps) during a charging/recharging cycle is reduced, or even eliminated. Reduction or elimination of lithium islands (i.e., lumps) can be provided by forming a lithium nucleation enhancement liner between a lithium-based solid-state electrolyte layer and a top electrode of a solid-state lithium based battery.

Abstract: In a metal negative cell in which the negative electrode mainly comprises a metal such as aluminum, magnesium, zinc, lithium, etc., self discharge readily occurs when the negative electrode and an electrolytic solution are in contact, and the problem of large capacity loss of the cell readily occurs. The metal negative cell is provided with a metal negative cell in which the self-discharge amount is reduced, and the capacity loss of the cell is reduced during use or storage, whereby the metal negative cell varies the cell output according to demand.

Abstract: An arrangement for battery pack protection during fluid ingress. The battery pack may include a housing, a terminal block, and a core battery assembly supported in the housing, the assembly including a core housing, a plurality of battery cells supported in the core housing, a first weld strap connecting the battery cells to a positive power terminal, a second weld strap connecting the battery cells to a negative power terminal, a first sacrificial electrode connected to the first weld strap, and a second sacrificial electrode connected to the second weld strap. A spacing between the first sacrificial electrode and the second sacrificial electrode may be selected such that an ingress fluid entering the battery pack electrically shorts the first sacrificial electrode and the second sacrificial electrode to drop a voltage of the cell battery assembly and discharge battery energy before damaging the battery cells.

Abstract: A meshwork for detecting an object in a magnetic field is provided. The meshwork includes a plurality of sensor lines. The sensor lines are connected together parallel to one another in a first direction. The sensor lines define multiple meshes in a second direction running transversely to the first direction. The respective meshes of adjacent sensor lines are coupled together such that the sensor lines form the meshwork. A device for detecting an object in a magnetic field, a method for producing the meshwork, and an inductive charging unit are also provided.

Abstract: In a nonaqueous electrolyte secondary battery, a positive electrode contains a lithium transition metal oxide and a phosphoric acid compound. A nonaqueous electrolyte contains a dinitrile represented by a general formula: NC-A-CN (A represents a linear hydrocarbon having 1 to 10 carbon atoms or a hydrocarbon which contains a main chain having 1 to 10 carbon atoms and at least one side chain having 3 or less carbon atoms); an ether represented by a general formula: R1—O—R2—O—R3 (R1 and R3 each represent a group which contains a main chain having 1 to 3 carbon atoms, and R2 represents a chain hydrocarbon group having 1 to 3 carbon atoms); and a fluorophosphate salt.

Abstract: Disclosed is a battery cell, which includes an electrode assembly, a battery case having a case body for accommodating the electrode assembly and a case terrace extending from the case body, a pair of electrode leads configured to protrude out of the battery case and electrically connected to the electrode assembly, and an overcharge cut-off unit provided in the case terrace to prevent overcharge of the battery cell.

Abstract: Provided is a top cover structure for power battery, including a first electrode assembly, a second electrode assembly, a top cover plate electrically connected with the first electrode assembly, and a deformable plate attached to the top cover plate; the second electrode assembly includes a second electrode terminal, a second connecting block, a second insulating piece in which a via-hole and an gas-guide hole are defined, an upper sealing piece arranged between the second insulating piece and the second connecting block and including a sealing area for deforming space and a sealing area for electrode terminal, and a lower sealing piece arranged between the second insulating piece and the top cover plate and enclosing the via-hole for deformable plate. The sealing area for deforming space encloses the via-hole and the gas-guide hole, the sealing area for electrode terminal enclose the second electrode terminal.

Abstract: A battery includes a safety valve configured to cause a deformation due to an increase in internal pressure of the battery; a restraining part including a plurality of first protrusions provided along a first circumference to serve as a restrainer against a lead part when the safety valve and the lead part are shut off due to deformation of the safety valve; and an insulating holder including a plurality of second protrusions provided along a second circumference to insulate the safety valve and the restraining part, where a number of the first protrusions and the second protrusions arranged on a diagonal line including the first circumference and the second circumference is 3 or less.

Abstract: A battery module cell cover is provided including a number of features configured to orient, capture, and isolate battery cell interconnections relative to battery cell locations in an array of battery cells. Isolation features may block a negative terminal battery cell interconnect from moving out of an orientation receptacle aligned with a negative terminal of a battery cell and into contact with a positive terminal of the battery cell, or vice versa. The battery module cell cover can include a number of structural connection features protruding from a planar surface into a battery cell containment cavity, between battery cell locations, that provide a number of surfaces for curing to structural adhesive of the battery module. These structural connection features, in conjunction with the structural adhesive, can assist in forming a unified strengthened structure of the battery module.

Abstract: An electrolytic solution includes a sulfone and a magnesium salt dissolved in the sulfone, in which the magnesium salt includes magnesium borohydride (Mg(BH4)2).

Abstract: The present invention is conceived in such a way as to prevent any damage to the battery management unit even if the solution leaks out of the cell, providing the battery with high safety. The battery according to the present invention is characterized by being provided with a cell, a battery management unit for managing the cell, a protection case holding the battery management unit, and a housing containing the cell and the protection case, wherein the protection case inside is hermetically sealed.

Abstract: A high-voltage battery for a motor vehicle having at least one storage element for electrical energy, at least one control unit operating at a voltage lower than the high voltage. A modular unit including at least one switching mechanism and/or at least one fuse as electrical components, wherein the modular unit is attached in a pre-determined position to a housing, externally to this housing that holds the storage element and the control unit, in such a way that when the modular unit is plugged in on the housing, at least two high-voltage contacts of the modular unit, which are connected to at least one of the electrical components of the modular unit, are connected in an electrically conducting manner to assigned high-voltage contacts on the housing side, and at least one contact arrangement of the modular unit.

Abstract: A secondary battery includes: a battery element; a casing which accommodates the battery element; a positive electrode terminal and a negative electrode terminal provided to the casing and electrically connected to the battery element; and a cut-off portion which switches from a grounded state in which the casing and one terminal of the positive electrode terminal and the negative electrode terminal have an identical potential, to a cut-off state in which the casing and the one terminal are electrically cut off. The one terminal has a facing portion which faces the casing, and the cut-off portion is arranged between the facing portion and the casing. When the casing is externally short-circuited, the cut-off portion switches from the grounded state to the cut-off state by being deformed by heat generated as a short-circuit current flows.

Abstract: A lithium (Li) ion battery includes a first electrode with a second electrode, and a shutdown polymer additive on an outer surface of the first electrode. The shutdown polymer additive includes at least two polyethylene layers, each polyethylene layer comprising a plurality of polyethylene microspheres. Each polyethylene microsphere is wrapped with carbon nanotubes. The polyethylene microspheres interconnect with each other such that the carbon nanotubes form a conductive network. The polyethylene layers are provided at predetermined areas of the outer surface of the first electrode.

Abstract: A battery module includes a housing. The battery module also includes a cell stack disposed in the housing and including a battery cell. The battery module also includes a force gauge in mechanical communication with the cell stack and configured to measure a force generated by a swelling of the cell stack. The battery module also includes a control module configured to receive data indicative of the force and to estimate a remaining usable life of the battery module based on the data.

Abstract: A fast charging method for a parallel battery pack is provided, including: obtaining a maximum charging current allowed by a charging trunk and a charging current required for charging a parallel battery pack; comparing the charging current required for charging the parallel battery pack with the maximum charging current allowed by the charging trunk; if the charging current required for charging the parallel battery pack is less than or equal to the maximum charging current allowed by the charging trunk, performing parallel charging on battery units; or if the charging current required for charging the parallel battery pack is greater than the maximum charging current allowed by the charging trunk, changing some or all of battery units in the parallel battery pack to a series connection, and performing series charging on the battery units. The fast charging method for a parallel battery pack can effectively shorten a charging time.

Abstract: The present disclosure provides a current detection system, method and device. The current detection system includes a management unit and a current detection device that is connected with the management unit. The current detection device includes a shunt-type current measurement unit, an open-loop Hall-type current measurement unit and an isolation power unit.

Abstract: The present disclosure relates to a lithium secondary battery which ensures reaction uniformity even though it uses a high-loading electrode, and thus has high capacity and improved cycle characteristics. The lithium secondary battery includes: an electrode assembly including a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode; an electrolyte including a lithium salt and an organic solvent; and a battery casing receiving the electrode assembly and the electrolyte, wherein the positive electrode has a loading amount of 3.5 mAh/cm2 or more, the separator has an air permeability of 200-1200 sec/100 mL, and the electrolyte has a lithium ion conductivity of 11-20 mS/cm.

Abstract: A fast charging method, a fast charging system, and a fast charging apparatus for a series battery pack, where the fast charging method including obtaining charge parameters of battery units in a series battery pack, determining, based on the charge parameters, whether there is a differentiated battery unit in the series battery pack, where the differentiated battery unit is a battery unit whose charge parameter is different from a charge parameter of the rest battery units in the series battery pack, and changing the battery units in the series battery pack to a parallel connection when there is a differentiated battery unit in the series battery pack, and performing parallel charging on the battery units. Hence, the fast charging method for a series battery pack can effectively shorten a charging time.

Abstract: A smoothing unit smoothes a detected voltage of each power storage block based on previous data during a certain period. A calculator calculates a difference between a smoothing voltage of one power storage block in the n power storage blocks and a representative value of the smoothing voltages of the other power storage blocks or all the power storage blocks. A determination unit determines a power storage block whose difference against the representative value enlarges more than or equal to a set value during a predetermined period as a power storage block containing an abnormal power storage cell.

Abstract: A flow battery includes a first liquid containing a first electrode mediator dissolved therein, a first electrode immersed in the first liquid, a first active material immersed in the first liquid, and a first circulation mechanism that circulates the first liquid between the first electrode and the first active material, wherein the first electrode mediator includes a bicarbazyl derivative. For example, the bicarbazyl derivative is represented by the general formula (1).

Abstract: A top cap structure for a power battery is provided. The power battery top cap structure includes a first and second electrode assemblies, and a top cap piece. The first electrode assembly includes a first electrode column having an upper and lower sections, a first seal member and a first connection block. The upper section and the first connection block are formed from a first base metal. The lower section is formed from a second base metal different from the first base metal. The upper section includes a step portion, and the lower section is joined with a bottom surface of the upper section below the top cap piece. The first seal member includes a horizontal extending portion. The horizontal extending portion is disposed between a lower surface of the top cap piece and the step portion. The top portion of the upper section connects with the first connection block.

Abstract: An electrically-driven working apparatus in one aspect of an embodiment of the present disclosure comprises: a battery; an abnormality detection unit; a power supply path; a first disconnection unit; a second disconnection unit; and a control unit. The control unit activates the first disconnection unit to disconnect the power supply path if either of an overload or an over discharge of the battery is detected by the abnormality detection unit, and subsequently determines whether discharge from the battery has stopped after activating the first disconnection unit, and activates the second disconnection unit to disconnect the power supply path if discharge from the battery has not stopped.

Abstract: The present invention relates to an apparatus for measuring a variation in thickness of an electrode of a secondary battery, which is capable of measuring a variation in thickness of the electrode of the secondary battery, and a secondary battery with the same mounted therein. Also, the apparatus for measuring a variation in thickness of the electrode of the secondary battery includes a piezoelectric element inserted into a case by passing through an observation hole defined in the case, in which an electrode assembly is accommodated, and having an inner end supported by the electrode assembly and a support member installed outside the case to support an outer end of the piezoelectric element, wherein the variation in thickness of the electrode is measured by using a voltage signal generated in the piezoelectric element according to an increase in thickness of the electrode provided in the electrode assembly.

Abstract: A battery cell includes an electrode assembly and a battery case. The electrode assembly includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The battery case includes an upper case and a lower case, at least one of the upper case and the lower case being provided with a receiving part, in which the electrode assembly is mounted. One end of each of electrode tabs extending from electrode plates of the electrode assembly is coupled to a corresponding end of an electrode lead, which protrudes outward from the battery case. The electrode lead is provided with at least one notch part configured to rupture in response to expansion deformation of the battery case when the pressure in the battery cell increases to achieve the electrical cutoff of the battery.

Abstract: Provided are a top cover assembly and a secondary battery containing the same. The top cover assembly includes a first electrode terminal, a conduction member, a second electrode terminal, and a top cover plate insulated from the first electrode terminal and electrically connected to the second electrode terminal, the secondary battery further comprises a contact plate which is attached to the top cover plate, the conduction member is insulated from the top cover plate and comprises an electrode terminal connection portion, a first fuse member, a contact plate connection portion, and a connection layer, the first fuse member has a melting point lower than the electrode terminal connection portion and the contact plate connection portion; the first fuse member is connected to the electrode terminal connection portion via the connection layer, and/or the first fuse member is connected to the contact plate connection portion via the connection layer.

Abstract: A rechargeable battery according to an exemplary embodiment of the present invention includes: an electrode assembly that includes a first electrode and a second electrode; a case where the electrode assembly is received; a first terminal that is electrically connected with the first electrode and a second terminal that is electrically connected with the second electrode; a cap plate that is coupled with the case, and where a short-circuit hole is formed; and a membrane that is fixed to the cap plate and electrically separates or disconnects the first electrode and the second electrode, wherein the second terminal includes a fuse connector, a first portion, and a second portion, and the first portion and the second portion are connected by the fuse connector, and the fuse connector is disposed apart from the membrane and disposed opposing the membrane.

Abstract: A system and method for mitigating the effects of a thermal event within a non-metal-air battery pack is provided in which the hot gas and material generated during the event is directed into the metal-air cells of a metal-air battery pack. The metal-air cells provide a large thermal mass for absorbing at least a portion of the thermal energy generated during the event before it is released to the ambient environment. As a result, the risks to vehicle passengers, bystanders, first responders and property are limited.

Abstract: A power battery cap structure and a power battery are provided. The power battery cap structure includes a first terminal, a second terminal and a cap assembly; the second terminal is electrically insulated from the cap assembly. The power battery cap structure further includes a resistance which electrically connects the first terminal with the cap assembly. The cap assembly includes a cap sheet, a first short circuit part and a second short circuit part; the first and second short circuit part are attached to the cap sheet, when internal pressure of the power battery exceeds predetermined threshold, the first and second short circuit part act and form a first path passing through the first terminal, the second short circuit part, the resistance and the second terminal, and a second path passing through the first terminal, the first and second short circuit part and the second terminal.

Abstract: Provided herein are battery cells for battery packs in electric vehicles. The battery cell can include a housing having a first end, a second end, and an inner surface. The housing can define an inner region and an electrolyte can be disposed in the inner region of the housing. A gasket can couple a lid with the first end of the housing to seal the battery cell. The inner surface can include a recess and a groove. The groove can form a path from the recess to an egress point on the first end of the housing. A pressure sensor can be disposed in the recess. The pressure sensor can couple with a pressure sensor wire disposed in the groove and the pressure sensor wire can extend from the recess and past the egress point on the first end of the housing to provide sensed pressure information.

Abstract: The present disclosure provides a current detection system, method and device. The current detection system includes a management unit and a current detection device that is connected with the management unit. The current detection device includes a shunt-type current measurement unit, an open-loop Hall-type current measurement unit and an isolation power unit.

Abstract: Provided is a secondary battery including a pressure type current interrupt device with reduced welding failures and high productivity as a result. A secondary battery disclosed herein includes an electrode body, a battery case for housing the electrode body, an electrode terminal electrically connected to the electrode body, and a current interrupt device provided in a conduction path between the electrode body and the electrode terminal to interrupt the conduction path in response to increase in pressure in the battery case. The current interrupt device includes a rivet and a reverse plate welded to the rivet. The current interrupt device has one continuous welding mark. The one continuous welding mark has a circumferential part that is continuous circumferentially along an outer edge part of the reverse plate. The start and end points of the one continuous welding mark are positioned offset from the circumferential part.

Abstract: The present invention relates to a battery cell. The battery cell comprises: an electrode assembly provided with an electrode tab; a case which accommodates the electrode assembly and of which at least a portion of an edge is sealed to provide a sealing surface; an electrode lead coupled to the electrode tab and led out of the case; a lead film disposed on each of top and bottom surfaces of the lead electrode disposed on the sealing surface of the case and coupled together with the sealing surface; and a main gas discharge tube disposed in the case and having one end buried in the lead film.

Abstract: A method for manufacturing oxide semiconductor secondary cells concurrently and evenly on a plurality of chips. A method for manufacturing a chip on which an oxide semiconductor secondary cell is mounted, the oxide semiconductor secondary cell that is formed by layering a first electrode, a charging function layer, and a second electrode being layered on a circuit. The method includes a layering process to layer and form the oxide semiconductor secondary cells integrally at regions corresponding to a plurality of chips formed on a wafer without separately forming oxide semiconductor secondary cells at regions corresponding to the respective chips, and a separating process to perform separation into individual oxide semiconductor secondary cells corresponding to the respective chips by performing pattern etching on the integrally-formed oxide semiconductor secondary cells to eliminate regions not corresponding to the respective chips except for regions corresponding to the respective chips.

Abstract: A device for performing electrochemical analysis of electrochemical cells includes a housing, upper and lower stack holders, and first, second, and third current collectors. The housing includes an inner chamber that can be hermetically sealed and a central axis extending through the inner chamber. The upper and lower stack holders are disposed within the inner chamber and cooperate to define an electrode stack chamber for housing a negative electrode, a positive electrode, and a center-mounted reference electrode. The first, second, and third current collectors are at least partially disposed in the inner chamber. The first current collector can be electrically connected to a first side of the negative electrode and an external circuit. The second current collector can be in electrical contact with the positive electrode and the external circuit. The third cylindrical body can be in electrical contact with the center-mounted reference electrode and the external circuit.

Abstract: A top cap structure for a power battery includes a first electrode assembly and a top cap piece. The first electrode assembly includes a first electrode column and a first connection block. The first connection block includes a main body and a compound portion that are bonded together. A base metal material of the main body is different from the base metal materials of the first electrode column and the compound portion. The compound portion includes a first connection hole and the main body includes a second connection hole. A top portion of the first electrode column includes a connection section. The connection section passes through the top cap piece, the second connection hole, and the first connection hole, and extends from the first connection hole. The connection section and the compound portion are welded together. The connection section is riveted to the second connection hole.

Abstract: A battery and related methods are described. The battery can include a plurality of battery cell segments. Each of the battery cell segments can include an anode segment, a cathode segment, and one or more current limiters. The one or more current limiters are configured to conditionally electrically isolate the battery cell segment based on an occurrence of a short circuit within the battery cell segment. The battery can be used to store electrical power and/or provide electrical power to a load.

Abstract: Provided are a battery pack and a control method using the same, the battery pack having improved safety so as to prevent fire or prevent fire from spreading even if ignited, thereby reducing the risks which can occur during ignition. The battery pack, according to the present invention, comprises: an electrode assembly comprising an anode, a cathode, and a separator; and a single cell or a plurality of cells having a pouch-shaped battery case for accommodating the electrode assembly, wherein the cell is accommodated and stacked by the module case, the module case comprises a fire suppression agent or a fire extinguishing agent at the inner or outer part thereof such that the fire suppression agent or the fire extinguishing agent is automatically discharged from the module case when cell swelling occurs.

Abstract: A vehicular battery module that is capable of securing the stability of a vehicle by inducing self-discharge of a battery cell when the battery is overcharged includes: a plurality of stacked battery cells, each of which includes a battery pouch and electrode terminals extending outwards from the battery pouch, and a variable-resistor disposed between the electrode terminals of the one-side battery pouch and the other-side battery pouch so as to electrically connect the two electrode terminals to each other.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery includes particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure. The particles have an average particle size DSEM based on electron microscopic observation in a range of 1 ?m to 7 ?m in which a ratio D50/DSEM of a 50% particle size D50 in volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and a ratio D90/D10 of a 90% particle size D90 to a 10% particle size D10 in volume-based cumulative particle size distribution is 4 or less.

Abstract: A battery cell system and an associated monitoring system is provided which includes at least an anode, a cathode, a separator formed from a base layer, first and second contacts and a reference component. The anode and cathode are disposed in a lithium ion non-aqueous solution within a housing. The base layer of the separator includes a first side and a second side. The base layer is operatively configured to separate the anode and the cathode within the housing. The first contact of the separator is affixed to the first side of the base layer between the base layer and an anode. The second contact is affixed to the second side of the base layer with the reference component disposed on the second contact.

Abstract: A photovoltaic (PV) monitoring system measures the health of PV installations by measuring, calculating, and reporting the passive (dark) and active (illuminated) electrical characteristics of the PV strings, substrings, and modules that comprise the installation.

Abstract: Provided is an energy storage apparatus which includes a first energy storage device having a first terminal which is either a positive electrode terminal or a negative electrode terminal, wherein the energy storage apparatus further includes a terminal neighboring member which is disposed adjacently to the first terminal of the first energy storage device, and the terminal neighboring member includes: a first housing portion capable of housing a first conductive member which connects the first terminal and a second terminal which a second energy storage device different from the first energy storage device has to each other; and a first lead-out portion capable of leading out a second conductive member which connects the first terminal and a third terminal which a third energy storage device different from the first energy storage device and the second energy storage device has to each other from the first housing portion.

Abstract: The embodiment of the present application relates to the field of Li-ion battery and, in particular, to a secondary battery. The secondary battery includes a cell, a safety component fixed on the cell and thermal conductive adhesive provided between the cell and the safety component, the thermal conductive adhesive contains at least one of hot melt adhesive, silica gel binder or epoxy resin binder, and thermal conductive filling material. The thermal conductive adhesive in the secondary battery performs good thermal conductivity and adhering property, which can stably adhere the safety component with the cell, meanwhile transferring, via the thermal conductive adhesive, heat of the cell to the safety component rapidly, so that the safety component cuts off the circuit to protect the cell during overcharge, thereby avoid situations that the thermal conductive adhesive is separated from the cell due to cell inflation and deformation.

Abstract: Provided are a battery pack and a control method using the same, the battery pack having improved safety so as to prevent fire or prevent fire from spreading even if ignited, thereby reducing the risks which can occur during ignition. The battery pack, according to the present invention, comprises: an electrode assembly comprising an anode, a cathode, and a separator; and a single cell or a plurality of cells having a pouch-shaped battery case for accommodating the electrode assembly, wherein the cell is accommodated and stacked by the module case, the module case comprises a fire suppression agent or a fire extinguishing agent at the inner or outer part thereof such that the fire suppression agent or the fire extinguishing agent is automatically discharged from the module case when cell swelling occurs.

Abstract: The present disclosure provides a secondary battery and an assembly therefor. The secondary battery comprises: a cap plate provided with a first electrode terminal and a second electrode terminal; an electrode assembly comprising a first electrode tab and a second electrode tab; a first connecting piece connected between the first electrode tab and the first electrode terminal. The first connecting piece includes a first electrode terminal connecting portion, a first electrode tab connecting portion and a first fusing portion. The secondary battery further comprises an insulating holding block, two ends of which are connected with the first electrode terminal connecting portion and the first electrode tab connecting portion respectively, and the insulating holding block is configured to maintain the first electrode terminal connecting portion and the first electrode tab connecting portion in position relative to each other when the first fusing portion is fused.

Abstract: A secondary battery, including a first terminal assembly, a second terminal assembly, a top cover plate, an electrode assembly and a first sealing piece; at least one of the first and second terminal assemblies is electrically insulated from the top cover plate; the first terminal assembly includes a connecting plate and deformable plate, the connecting plate is located at a side of the top cover plate away from the electrode assembly, the deformable plate is attached to the connecting plate; the first sealing piece is connected between the connecting plate and the top cover plate; in normal state, the first electrode plate is electrically connected with the connecting plate via the deformable plate, the second plate is electrically connected with the second terminal assembly; when internal pressure of the secondary battery exceeds reference pressure, the deformable plate can deform to electrically disconnect from the first electrode plate.

Abstract: A battery module having a plurality of battery cells electrically connected to each other is disclosed.