Abstract: A sealed battery cell including an anti-explosion mechanism disposed between an electrode group and a top cover, and that deforms or cleaves due to elevation of internal pressure in the battery cell, the electrode group being comprised of a positive electrode and a negative electrode that are laminated together; wherein the anti-explosion mechanism includes a diaphragm, a connection plate welded to the diaphragm, and a connection lead welded to the connection plate; and the connection plate includes a thinner portion where a spot at which the connection lead is connected is formed as thin, and a thicker portion where the thinner portion is not formed, and a lower surface of the thinner portion is formed as coincident with a lower surface of the thicker portion, or as hollowed out from the lower surface of the thicker portion.

Abstract: There are a secondary battery having a pouch-type outer casing and a manufacturing method thereof. In one embodiment, a secondary battery includes an electrode assembly and an outer casing. The electrode assembly has positive and negative electrode plates, a separator interposed therebetween, and positive and negative electrode tabs having one ends respectively connected to the positive and negative electrode plates. The outer casing accommodates the electrode assembly so that the other ends of the positive and negative electrode tabs are extracted from a first side to the exterior thereof. The outer casing has a sealing portion sealed at least twice. The sealing portion is primarily sealed to be fractured under a predetermined internal pressure of the outer casing. After the aging of a battery, the sealing portion is fractured under the predetermined internal pressure, thereby exhausting internal gas. After the exhaustion of the internal gas, the sealing portion is secondarily sealed.

Abstract: A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case containing the electrode assembly; and a cap assembly coupled to the case. The cap assembly includes a cap plate and a short circuit member attached to the cap plate. The short circuit member includes a portion having a different thickness from another portion of the short circuit member.

Abstract: A secondary battery includes a cylindrical battery case, a positive and negative electrode body group, a top plate and a battery lid connected to first and second electrode bodies of the electrode body group respectively. The secondary battery further includes a current collector placed on an end of the electrode body group on the top plate side and connected to the first electrode body of the electrode body group and a spacer placed between the top plate and the current collector. The top plate is partly formed with a thin portion. The spacer is formed with through holes in positions corresponding to the thin portion. The portion of the current collector corresponding to the thin portion is in contact with the thin portion through the through hole. The thin portion is deformed when the internal pressure of the battery case rises, thereby breaking electric connection between the top plate and the current collector.

Abstract: The disclosed embodiments relate to a battery cell which includes a weakness for relieving pressure. This battery cell includes a jelly roll comprising layers which are wound together, including a cathode with an active coating, a separator and an anode with an active coating. The jelly roll also includes a first conductive tab coupled to the cathode and a second conductive tab coupled to the anode. The jelly roll is enclosed in a flexible pouch, wherein the first and second conductive tabs extend through seals in the pouch to provide terminals for the battery cell. This pouch includes a weakness which yields when internal pressure in the pouch exceeds a threshold to create a hole which releases the internal pressure.

Abstract: A cap-up plate and a cylindrical secondary battery having the cap-up plate are disclosed. In one embodiment, the cap-up plate includes i) a base plate and ii) a terminal extending from a portion of the base plate, wherein the terminal has a flat portion substantially parallel with the base plate, and wherein the flat portion comprises an end which is located over the portion of the base plate. The end of the flat portion may overlap with the portion of the base plate along a direction substantially perpendicular to the base plate.

Abstract: A cylindrical lithium secondary battery includes: an electrode assembly with a center pin at a center of the electrode assembly; a can accommodating the electrode assembly; and a cap assembly coupled to a top of the can, wherein at least one end of the center pin is contoured to deform during collision between the center pin and a bottom surface of the can or the cap assembly and to absorb the impact so as to prevent the center pin from escaping the cylindrical lithium secondary battery.

Abstract: An electrochemical cell is provided with an enhanced pressure relief vent formed in a closed end of the cell container that allows for effective venting of gas from the closed end of the container. The cell includes a container having a first end, a second end, a side wall extending between the first and second ends, and an end wall extending across the first end. The cell has a positive electrode, a negative electrode, and an aqueous alkaline electrolyte, all disposed in the container. The cell further includes a pressure relief vent mechanism having an offset C-shaped reduced thickness groove formed in the end wall of the container. A cover can be welded to the closed end wall of the container over the pressure relief vent mechanism.

Abstract: A secondary battery may be manufactured with an electrode assembly having a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. A container encases the electrode assembly. A hole formed on one end of the container with a stepped configuration that opens with different diameters on opposite sides of a cap plate and a safety valve mounted in the stepped surface of the hole, is configured to rupture and tear open upon occurrence of a predetermined internal battery pressure.

Abstract: The present invention discloses a rechargeable battery that has an improved mounting structure for an electrode terminal and a second protective device used therein. This improved structure improves the function of the rechargeable battery. The rechargeable battery comprises an electrode assembly that has first electrode plate, a second electrode plate, and a separator for insulating the electrode plates from each other, all of which are wound together. It also includes a can that contains the electrode assembly therein, a cap assembly that has a cap plate for sealing a top opening of the can, an electrode terminal that is insulated and inserted into a terminal through-hole formed on the cap plate, and a terminal groove formed on the top of the terminal through-hole with a shape corresponding to that of the head of the electrode terminal so that the head of the electrode terminal can be housed therein.

Abstract: A secondary battery provided with a safety element (16) comprising a conductive current interrupter (161) and an insulation holder (162) at thereof bottom. By safety element provided at the bottom of the battery, either sealed formation technology or open-formation technology is allowed in battery formation processing, and any other sealing method is selectable as well as pressing sealing.

Abstract: An electrochemical cell with a collector assembly for sealing the open end of a cell container. The collector assembly includes a retainer and a contact spring with a peripheral flange, each having a central opening therein. A pressure release vent member disposed between the retainer and the peripheral flange of the contact spring seals the openings in the retainer and contact spring under normal conditions and ruptures to release pressure from within the cell when the internal pressure exceeds a predetermined limit.

Abstract: The film-covered electrical device of the present invention includes covered portion (S1) where a portion of covering film (6) is folded to cover end surface (5d) of covering film (5) through which metal layer (5b) is exposed, non-covered portion (S2) where end surface (5d) of covering film (5) is not covered with folded covering film (6), sealing portion (8) (a first sealing portion) produced by thermally fusing thermally-fusible resin layer (6c) of covering film (6) and thermally-fusible resin layer (5c) of covering film (5), and portion B (a second sealing portion) produced by thermally fusing protective layer (5a) of covering film (5) and thermally-fusible resin layer (6c) of covering film (6), wherein sealing portion (8) (the first sealing portion and non-covered portion (S2)) is provided with a safety valve for releasing internal gas when a rise in internal pressure occurs.

Abstract: There is provided a secondary battery enabling an electrode terminal to be deformed in an internal direction of a can by preventing the upper plate of the can from being deformed in an internal direction of the can when a compression is applied in a direction perpendicular to the longitudinal axis. In one embodiment, a secondary battery includes a can having one opened portion to accommodate an electrode assembly. An upper plate is positioned at the opened portion of the can and has a pair of short side portions and a pair of long side portions connected both sides of the short side portions. In the secondary battery, a short circuit preventing portion formed thinner than other regions while crossing between the long side portions is further formed at a central portion of the bottom surface of the upper plate. Accordingly, the stability of the secondary battery can be improved.

Abstract: A fuel cell casing having a laminate structure of a first double-sided adhesive tape, an interposed member, and a second double-sided adhesive tape. The laminate structure may be placed between a casing body and a depressurizing cover. In the fuel cell casing of this structure, adequate selection of the material for the interposed member and adequate specification of an adhesion area of at least either the first double-sided adhesive tape or the second double-sided adhesive tape to the interposed member readily attain the desired design of ensuring easy separation of the depressurizing cover from the casing body by simple application of a force to the depressurizing cover under a preset level of inner pressure, without changing the materials of the casing body and the depressurizing cover.

Abstract: In a film-packed battery which stores a battery element (9) with packing films (8a, 8b) and sealed by heat-sealing heat-sealed surfaces of the packing films around the battery element, a heat-sealed portion (6) projecting toward a battery element is provided at part of a heat-sealed portion (5), and a gas releasing portion (7) is formed close to the projecting heat-sealed portion. A pressure safety valve for safely releasing a gas to the outside when the gas is generated in the battery is provided without lowering the reliability of the battery.

Abstract: The present invention provides a cell cap assembly including a grommet defining a through hole, a stripper contact plate defining at least one gas hole securely received in the through hole, an rupture plate securely positioned in the through hole and in electrical connection with the stripper contact plate, and an end cap electrically connected with the rupture plate. The rupture plate includes an outer ring portion, a bent portion extending from the outer ring portion, and a planar recessed portion defining a recess formed at one end of the bent portion.

Abstract: A rechargeable battery according to an exemplary embodiment of the present invention includes an electrode assembly, a case containing the electrode assembly, and a cap assembly. The electrode assembly includes a first electrode, a second electrode, and a separator between the first and second electrodes. The cap assembly is coupled to the case. The cap assembly includes a tab that is electrically connected to the first electrode and a deformable plate that is electrically connected to the second electrode. The deformable plate also includes a notch that is opened due to an increase of pressure. The deformable plate deforms as a result of increased pressure and electrically contacts the first tab, short circuiting the rechargeable battery.

Abstract: A safety device for use in a lithium ion battery includes a top cover defining a central hole and a number of peripheral holes set around the central hole, a rupture plate fixed to the bottom surface of the top cover and sealing the peripheral holes and the central hole, and a vent plate defining an air hole electrically connected to the rupture plate via an electrical connection point. Other part of the rupture plate is electrically insulated from the vent plate via an insulating gasket. The central hole and the peripheral holes around the central hole can prevent the deformed rupture plate from blocking the air vent passage of the lithium ion battery to improve the safety performance of the lithium ion battery.

Abstract: An electrochemical cell is provided with an enhanced pressure relief vent formed in a closed end of the cell container that allows for effective venting of gas from the closed end of the container. The cell includes a container having a first end, a second end, a side wall extending between the first and second ends, and an end wall extending across the first end. The cell has a positive electrode, a negative electrode, and an aqueous alkaline electrolyte, all disposed in the container. The cell further includes a pressure relief vent mechanism having an offset C-shaped reduced thickness groove formed in the end wall of the container. A cover can be welded to the closed end wall of the container over the pressure relief vent mechanism.

Abstract: An electrochemical cell with a collector assembly for sealing the open end of a cell container. The collector assembly includes a retainer and a contact spring with a peripheral flange, each having a central opening therein. A pressure release vent member disposed between the retainer and the peripheral flange of the contact spring seals the openings in the retainer and contact spring under normal conditions and ruptures to release pressure from within the cell when the internal pressure exceeds a predetermined limit.

Abstract: A battery module includes at least one electrochemical cell. The electrochemical cell includes a first terminal conductively coupled to a first electrode and a body portion configured to function as a second terminal and conductively coupled to a second electrode via a pressure relief portion. The battery module further includes an end cap comprising a conductive portion and an insulating portion, the conductive portion being conductively coupled to the body portion. The pressure relief portion is configured to separate from the body portion to a deployed position when a pressure within the body portion reaches a first predetermined level, thereby substantially breaking the conductive coupling between the body portion and the second electrode. The insulating portion substantially prevents formation of a conductive coupling between the body portion and the second electrode when the pressure relief portion is in the deployed position.

Abstract: Disclosed herein is a cap assembly loaded on an open upper end of a cylindrical container of a battery in which an electrode assembly is mounted in the cylindrical container, the cap assembly including a safety vent having a predetermined notch configured to rupture by high-pressure gas generated in the battery, a current interruptive device coupled to a bottom of the safety vent by welding for interrupting current when internal pressure of the battery increases, and a current interruptive device gasket for surrounding an outer circumference of the current interruptive device, wherein the current interruptive device includes two or more through holes for gas discharge, the through holes being formed such that the sum of areas of the through holes is equal to 20% to 50% of an entire area of the current interruptive device. When high-pressure gas is generated in the battery, the cap assembly effectively interrupts current and rapidly discharges the gas, thereby greatly improving safety of the battery.

Abstract: Sealing frame (1) for utilization in a battery, encompassing a base body (2) whereby the base body (2) encompasses an opening (3), whereby the base body (2) features a first sealing surface (4) and a facing second sealing surface (5) and whereby the first sealing surface (4) and/or the second sealing surface (5) are implemented elastically compressible.

Abstract: A rechargeable battery includes a case having an opening; an electrode assembly accommodated into the case and having first and second electrode taps protruding upwardly; a cap assembly including a cap plate covering the opening of the case and a electrode terminal insulated from the cap plate; first and second electrode leads connected to the electrode terminal and the cap plate, respectively; a circuit board connected to the cap assembly by the first and second electrode leads; a resin portion filling a space between the cap assembly and the circuit board; and an insulation reinforcing portion insulating the cap assembly from the first electrode lead and the cap plate. With the insulation reinforcing portion, it is possible to prevent the cap assembly from separating from the resin portion under external pressure.

Abstract: A system for integrating the venting feature of a battery with a means for simultaneously disconnecting the cell from the battery pack, thereby isolating the cell, is provided. The provided battery interconnect system is comprised of a battery, a connector plate for electrically coupling the battery to a battery pack, and an interruptible electrical connector for electrically coupling the connector plate to a battery terminal vent. The vent, defined by scoring on the battery terminal, ruptures when the internal battery pressure exceeds the predefined battery operating range, causing the interruptible electrical connector to break and disrupt electrical continuity between the connector plate and the battery terminal.

Abstract: A secondary battery includes an electrode assembly, a can receiving the electrode assembly, and a cap assembly coupled to the open upper part of the can. In addition, a vent including an opening, which is thinner than the can is formed on a wide side of the can, and a shock absorbing portion, which is thinner than the can and thicker than the opening, is formed near the vent. Accordingly, the vent can be protected from damage from external shocks, which are absorbed by the shock absorbing portion.

Abstract: Disclosed are an electrolyte for a secondary battery, and a secondary battery including the same, the electrolyte including an electrolyte salt; an electrolyte solvent; and a compound generating heat through oxidation at voltages higher than drive voltage of a cathode, wherein the compound can decompose or evaporate electrolyte components by oxidation heat, thereby causing gas generation. Also, the compound is included in an internal pressure increase accelerant for a battery. Upon overcharge, since a compound subjected to oxidation at voltages higher than normal drive voltage of a cathode generates heat, electrolyte components can be decomposed or evaporated, thereby generating gas by the oxidation heat. Accordingly, it is possible to operate a safety means of a battery, without using an internal pressure increasing material directly generating gas through oxidation at overcharge voltage as the electrolyte additive, and thus to improve the overcharge safety of a secondary battery.

Abstract: A closure assembly and rupturable vent seal adapted for use in an electrochemical battery cell is disclosed. The vent seal includes a series of peripheral projections that can be folded to insure proper sealing of the vent without wrinkles or overlapping folded portions. Methods of accomplishing the invention are also contemplated.

Abstract: A rechargeable battery includes an electrode assembly, a case containing the electrode assembly and a cap assembly coupled to the case. The electrode assembly includes a first electrode, a second electrode, and a separator between the first electrode and the second electrode. The cap assembly includes a cap plate and a deformable plate attached to the cap plate and configured to deform in response to an increase in pressure inside the case to electrically couple the first electrode and the second electrode to each other.

Abstract: An electrochemical cell with a collector assembly for sealing the open end of a cell container. The collector assembly includes a retainer and a contact spring with a peripheral flange, each having a central opening therein. A pressure release vent member disposed between the retainer and the peripheral flange of the contact spring seals the openings in the retainer and contact spring under normal conditions and ruptures to release pressure from within the cell when the internal pressure exceeds a predetermined limit.

Abstract: Disclosed herein is a battery cell constructed in a structure in which an electrode assembly is mounted in a battery case made of a laminate sheet including a metal layer and a resin layer, and the battery case is thermally welded along the edge of a receiving part thereof to form a sealing part, wherein a weak part is formed at a portion of the sealing part (‘an electrode lea correspondence portion’) corresponding to one of electrode leads (a, b) connected to the electrode assembly, e.g., the electrode lead (a) having relatively low flexibility, the weak part being physically deformed, such that internal gas is discharged outside through the weak part, when predetermined pressure is applied to the weak part, and the weak part is not formed at an electrode lead correspondence portion of the other electrode lead (b).

Abstract: The invention broadly provides improved safety features for batteries utilized in electronic devices. The invention provides an improved CID design that allows for more reliable disconnection (breaking the electrical circuit) during abnormal pressure or temperature events inside the cell. The invention provides a multi-layered CID configured to force electric current through a thin, fragile element such that the thin, fragile element is broken upon any abnormal pressure and temperature event.

Abstract: A rechargeable battery configured to stably and easily interrupt a current includes: an electrode assembly including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; a case containing the electrode assembly therein and having a first opening at one end thereof; and a first plate coupled to the case and sealing the first opening, the first plate electrically connected to the electrode assembly, wherein the first plate includes a wrinkle portion configured to deform for disconnecting the first plate from the electrode assembly when an internal pressure of the case is greater than a reference pressure.

Abstract: Provided is a battery capable of providing both fixing durability of a protective film during normal use and peeling easiness of the protective film during operation of a safety valve. A lithium ion secondary battery (100) includes a protective film (140) fixed to a battery case (110) while covering a safety valve part (125) including a breakable portion (126). This protective film (140) has a first fixed portion (145) located around a valve-corresponding unfixed portion (144) and fixed to the battery case (110) and a second fixed portion (147) located more outside than the first fixed portion and fixed to the battery case (110) through an intermediate unfixed portion (146). They are configured such that the first fixed portion (145) first peels off when the safety valve part (125) operates, prompting peeling of the second fixed portion (147), thus releasing gas to the outside.

Abstract: Lithium rechargeable batteries having functional center pins are provided. A lithium rechargeable battery has a center pin whose top and bottom ends are blocked by a thermal cut-off composition to reduce the void volume inside a bare cell during initial overcharge. The thermal cut-off composition melts at a temperature within a specific temperature range, e.g. between about 80 and about 250° C. This prevents the battery from exploding and igniting. Thus, the inventive lithium rechargeable batteries have improved thermal stability.

Abstract: A sealed battery (100) provided in the present invention includes an electrode assembly (80), an outer case (40) housing the electrode assembly (80), a sealing lid (20) for closing an opening (42) of the outer case (40), and a current cutoff valve (22) that is deformed by abnormal internal pressure in the outer case (40). A plurality of conductive members (10) for carrying current between the current cutoff valve (22) and electrode assembly (80) are attached to the current cutoff valve (22). The plurality of conductive members (10) are configured so as to be broken off in a stepwise manner by the deformation of the current cutoff valve (22) as a result of abnormal internal pressure, thereby shutting off current flowing between the current cutoff valve (22) and electrode assembly (80).

Abstract: An end cover assembly for a battery with a core comprises a contact terminal, a conductive element, and a thermistor. The conductive element is in electrical communication with the core of the battery. The thermistor is disposed between the terminal and the conductive element. The thermistor electrically connects the terminal and the conductive element when the temperature of the battery is below a predetermined temperature. The thermistor electrically disconnects the terminal and the conductive element when the temperature of the battery is above the predetermined temperature.

Abstract: A cylindrical secondary battery where safety can be secured even when an external pressure accompanying rapid deformation of the battery acts on the battery is provided in a battery having a large capacity. A lithium ion secondary battery has a capacity of 14 Ah, where an upper lid is fixed to a battery can which receives an electrode winding grope therein. The upper lid includes a diaphragm 2 formed with a rupturing valve and an upper lid cap whose peripheral edge portion is fixed to a peripheral edge portion of the diaphragm 2. The rupturing valve includes a rupturing groove 8 with a V-shaped section formed on a surface of the diaphragm 2 positioned on the side of the upper lid cap and a rupturing groove 18 with a U-shaped section formed on a surface of the diaphragm 2 positioned on the side of the electrode winding group so as to correspond to the position of the rupturing groove 8.

Abstract: A secondary battery with a maximized cycle-life having a multi-stage safety valve so as to lower the inner pressure of the battery in stages. The multi-stage safety valve is installed on a case and the secondary battery is equipped with an electrode assembly including both positive and negative electrodes and a separator interposed therebetween.

Abstract: A modular current interrupt device includes an electrically-conductive rupture disc, an electrically-conductive pressure disc attached to the rupture disc to form an electrical pathway. An electrically-insulating ring partitions a perimeter of the rupture disc from a perimeter of the pressure disc, and a seating element secures the electrically-insulated ring to the pressure disc. At least one of the rupture disc and electrically-insulating ring defines a conduit, whereby exposure of one side of the pressure disc to sufficient force through the conduit causes the pressure disc to separate from the rupture disc to thereby sever the electrical pathway. A low pressure current interrupt device (CID) activates at a minimal threshold internal gauge pressure in a range of, for example, between about 4 kg/cm2 and about 9 kg/cm2.

Abstract: There is provided a sealed prismatic battery having an opening vent excellent in reliability with use of a deformed state of a battery casing on occasion of abnormal increase in internal pressure of the battery. The battery casing is shaped like an oval quadrangle having a width in a direction of thickness smaller than a height in a longitudinal direction and a length in a lateral direction, and side walls of the casing that face in the lateral direction swell outward in the lateral direction so as to form circular-arc shapes in general. The opening vent is composed of a groove formed as a recess on the side wall. A distances from the upper end of the battery casing to the groove is set between 3 and 20% of the longitudinal height of the battery casing.

Abstract: Lithium rechargeable batteries having functional center pins are provided. A lithium rechargeable battery has a center pin having a compressed compression spring positioned within a thermal cut-off composition to reduce the void volume inside a bare cell during initial overcharge. The thermal cut-off composition melts at a temperature within a specific temperature range, e.g. between about 80° C. and about 250° C. This prevents the battery from exploding and igniting. Thus, the inventive lithium rechargeable batteries have improved thermal stability.

Abstract: A rechargeable battery including: an electrode assembly with a positive electrode, a negative electrode and a separator interposed therebetween; a case housing the electrode assembly; a cap plate connected to the case; a first terminal and a second terminal protruding from an upper part of the cap plate; and a current interrupt module electrically connected to the electrode assembly and the first terminal, wherein the current interrupt module includes a current interrupt unit coupled to the electrode assembly and the current interrupt unit is configured to uncouple from the electrode assembly when an internal pressure of the case increases.

Abstract: In an alkaline dry battery using a polyamide resin sealing gasket that is placed between a battery case and an anode terminal plate without using a stiffening member and seals the battery case in an airtight manner, the sealing gasket includes a first and a second thin wall parts and is formed of polyamide resin, polyhexamethylene dodecanamide.

Abstract: A secondary battery having a current interrupt device (CID) between a negative current collecting plate and a case of the secondary battery. The secondary battery includes: an electrode assembly including a positive electrode, a separator, and a negative electrode; a case housing the electrode assembly; a cap assembly coupled to the case for sealing the case; a positive current collecting plate connected to the positive electrode and the cap assembly; an insulator in the case adjacent an end plate of the case; and a negative current collecting plate connected to the negative electrode and the end plate of the case, the end plate being curved convexly toward an inner cavity of the case.

Abstract: A low pressure current interrupt device (CID) activates at a minimal threshold internal gauge pressure in a range of, for example, between about 4 kg/cm2 and about 9 kg/cm2. Preferably, the CID includes a first conductive plate and a second conductive plate in electrical communication with the first conductive plate, the electrical communication between the first and the second conductive plates being interrupted at the minimal threshold internal gauge pressure. More preferably, the first conductive plate includes a frustum having a first end and a second end, a base extending radially from a perimeter of the first end of the frustum, and an essentially planar cap sealing the second end of the frustum. The first end has a broader diameter than the second end. More preferably, the second conductive plate is in electrical contact with the essentially planar cap through a weld. A battery, preferably a lithium-ion battery, comprises a CID as described above.

Abstract: A sealed rectangular battery having a reliably operative explosion-proof valve is provided. A rectangular battery case 1 whose cross-section is oblong, the battery case having a prismatic shaped case body 5 with a bottom and a lid 6. An explosion-proof valve 2 is arranged near one of two opposing short sides of a main surface wall of the lid. The explosion-proof valve a V-cut groove 15 concavely formed in V-shaped or U-shaped in which a central bent part 15a is positioned at a central location in the main surface wall 6a of the lid, and a thin wall 16 formed by the V-cut groove. Cut grooves 18 connecting each of two ends of the V-cut groove and each of two long sides of the main surface wall of the lid which are parallel to each other, respectively, are cut and formed in the main surface wall of the lid.

Abstract: A simplified cell design is provided for a battery utilizing the 18650 form-factor, the simplified cell design reducing manufacturing cost, battery weight and the risk of shorting between the battery case and the battery terminal. In the cap assembly of the disclosed battery, the safety vent element, which is recessed relative to the top of the cell case, also serves as the battery terminal. Additionally, the insulating gasket positioned between the cell case and the cap assembly is designed to cover a large portion of the outer surface of the safety vent/battery terminal.

Abstract: A cap assembly for a battery and a battery incorporating the cap assembly. The cap assembly includes a plate that connects the electrodes of the bare cell of the battery. The cap assembly includes a vent member that includes a protrusion that is physically connected to the plate. Excess pressure within the bare cell results in the protrusion disconnecting from the plate thereby interrupting current. The vent further includes two circular notches, an inner notch and an outer notch. The vent further includes a cross notch that extends radially outward so as to intersect and extend beyond both the first and second notches. The notches are configured to release when the pressure within the bare cell exceeds a burst pressure.