Abstract: Magnetic Resonance (MR) conditional medical equipment for use in MR environments. The MR conditional medical equipment includes MR conditional handheld battery operated devices, for example, laryngoscopes, flashlights, and the like, and MR conditional carbon zinc power packs for operating the devices. The devices can be designed to be inoperable by standard alkaline batteries which would render the medical equipment non MR conditional. Alternatively, the devices can have a sealed power pack compartment pre-installed with a non-replaceable carbon zinc power pack.

Abstract: The present invention includes a portable battery with a shaped positive terminal that may be used as a tool for engaging a battery door fastener. The terminal protrudes from the positive end of the battery similar to a traditional cap and base battery terminal. The shape allows the positive terminal to engage with a battery door fastener and, when the battery is rotated, drive the fastener into either an open or closed position. This allows the battery door to be locked or unlocked without the hassle of locating a separate tool such as a screwdriver. To replace a battery, a person uses the replacement battery to disengage the battery door fastener, opens the battery door, replaces the used battery, then closes the door and reengages the fastener with the used battery. The shaped terminal may also serve as a three dimensional identifier for which end of the battery is the positive terminal.

Abstract: A battery includes a case housing an electrode assembly, the case having an opening for receiving the electrode assembly, a cap plate combined with the opening so as to close the case, a first insulator on an outer surface of the cap plate, an electrode terminal electrically connected to the electrode assembly, the electrode terminal extending through a first terminal hole in the cap plate and a second terminal hole in the first insulator, a first connection portion that mates the cap plate to the first insulator so as to oppose rotation of the first insulator relative to the cap plate, the first connection portion being eccentric with respect to a central line of the first terminal hole, and a second connection portion that mates the first insulator to the electrode terminal so as to oppose rotation of the electrode terminal relative to the first insulator.

Abstract: An electrode is provided with a metal terminal extending from a battery module main body, a bolt which has an expanded section configuring a retaining section at a rear end portion and penetrates the metal terminal upward, and an insulating body which insulates the metal terminal and the battery module case one from the other. The insulating body is provided with a drop preventing section which abuts at least a lower surface of the expanded section of the bolt and prevents the bolt from dropping from the metal terminal.

Abstract: An electrode is provided with a metal terminal extending from a battery module main body, a bolt which has an expanded section configuring a retaining section at a rear end portion and penetrates the metal terminal upward, and an insulating body which insulates the metal terminal and the battery module case one from the other. The insulating body is provided with a drop preventing section which abuts at least a lower surface of the expanded section of the bolt and prevents the bolt from dropping from the metal terminal.

Abstract: In an electrochemical cell including a cathode 7, an anode 6, electrolyte 10, a hollow container 1 accommodating these members, and terminals extending from the inside to the outside of the hollow container 1, the terminals include a plurality of inner terminals 5a formed on the inner surface of the hollow container 1, a cathode outer terminal 5b1 formed on the outer surface of the hollow container 1, and an inner layer wire 5c formed on the inner layer of the hollow container 1 for commonly connecting the plurality of inner terminals 5a to the cathode outer terminal 5b1.

Abstract: Embodiments are described which provide for a rechargeable battery pack for use in a flashlight. The rechargeable battery pack may include a rechargeable cell, one or more conductive contacts to provide power to a flashlight, and a charging port. The rechargeable battery pack may include these components as a self-contained unit inside a single casing. A flashlight may be configured to accept the rechargeable battery pack in a cavity of the flashlight as well as a non-rechargeable battery pack of a similar profile. Embodiments are also described which provide for a rechargeable pen light with conductive body portions, such that the pen light may be charged through insertion in a charging cover. Other embodiments may be described and claimed.

Abstract: A battery comprises a battery case forming a substantially sealed enclosure and an electrode stack within the enclosure. The electrode stack includes a first set of electrode elements and a second set of electrode elements. The electrode elements in the second set alternate with the electrode elements in the first set within the electrode stack. In addition, the electrode elements include coincident alignment apertures. The coincident alignment apertures are configured to restrict rotation of the electrode elements to align the electrode elements when the alignment apertures are positioned over mating alignment protrusions during assembly of the electrode stack. The battery further comprises a feedthrough including a feedthrough pin extending through the battery case. The feedthrough pin is electrically coupled to the electrode stack and serves as a positive terminal for the battery.

Abstract: A battery pack that prevents a short from being generated when an insulation film near coupling holes formed in the conforming cover is broken by the connection tab due to external impacts and penetrates into the wire while or after the connection tab is assembled with the conforming cover through the coupling holes. The battery pack includes battery cells, a connection tab connecting the battery cells to each other in series or parallel, a conforming cover having a wire and coupling holes formed at one side thereof to allow the connection tab to pass therethrough, the conforming cover electrically connected to the connection tab, a protection circuit module electrically connected to the conforming cover and controlling charging and discharging of the battery cells, and a reinforcing member surrounding at least both sides of upper and lower edges among outer peripheral portions of the coupling holes formed in the conforming cover.

Abstract: A battery pack and a method for fabricating the same are provided. The battery pack includes a plurality of battery cells connected in series or in parallel to each other, a protective circuit module (PCM) controlling charging and discharging of the plurality of battery cells, and a coverlay electrically connecting the plurality of battery cells to the PCM, wherein the coverlay includes a plurality of wires, each of the plurality of wires includes battery connecting pads provided at its one end, the battery connecting pads connected to the battery cells, and module connecting pads provided at it's the other end, the module connecting pads connected to the PCM, and a solder layer is formed on the battery connecting pads.

Abstract: An assembled battery is provided which can improve output density. Four unit cells are connected in series by a connection member 40 composed of a stacked metal plate obtained by stacking two metal plates 40a and 40b. The metal plate 40a is one of copper and aluminum while the metal plate 40b is nickel. Since the volume electrical resistance of both copper and aluminum is less than half that of nickel, the overall electrical resistance of the connection member 40 is lowered. Both end portions of the connection member 40 are joined to external electrode terminals by resistance welding so that the weld joint is formed from either a Cu—Ni or Al—Ni low resistance binary alloy.

Abstract: A battery pack includes a plurality of battery modules, each battery module including a plurality of battery units with positive and negative electrode terminals, and each battery unit including a plurality of battery cells, a plurality of bus bars connecting positive electrode terminals to negative electrode terminals of adjacent battery units, battery modules adjacent to each other in a horizontal direction being electrically connected to each other via the bus bar to form a loop, and a connection member electrically connecting battery modules adjacent to each other in a vertical direction.

Abstract: By combining crimping fixing and laser welding, a collector attached to a substrate of an electrode assembly is fixed to a terminal. A negative electrode terminal 19A has a terminal portion formed on one side of a flange portion, and a cylindrical crimping member 19b on the other side. The cylindrical crimping member 19b is inserted through openings formed in a first insulating member, a sealing plate, a second insulating member, and a negative electrode collector 18a. The cylindrical crimping member 19b is crimped in a diameter-increasing direction, and is mechanically fixed in a countersunk hole 18c of the negative electrode collector 18a. A peripheral portion of a thin-walled portion 19d having a thickness smaller than those of other portions formed at the tip end portion of the cylindrical crimping member 19b is thoroughly adhered and welded by a high energy beam to the edge of the countersunk hole 18c.

Abstract: An object is to provide a power storage device with high discharge capacity and high energy density. The power storage device includes a positive electrode in which a positive electrode active material is formed over a positive electrode current collector; and a negative electrode which faces the positive electrode with an electrolyte interposed therebetween. The positive electrode active material includes a film-form first region which includes a compound containing lithium and nickel; and a film-form second region which includes a compound containing lithium and one or more of iron, manganese, and cobalt, but not containing nickel. The first region is covered with the second region. Since a superficial portion of the positive electrode active material does not contain nickel, nickel is not in contact with an electrolyte solution; thus, generation of a catalyst effect of nickel can be suppressed, and a high discharge potential of nickel can be utilized.

Abstract: A battery includes an external terminal, a thermal fuse, a bare cell, an electrode assembly disposed within the bare cell and electrically coupled to the external terminal via the thermal fuse, such that the thermal fuse electrically disconnects the electrode assembly from the external terminal when a temperature of the battery reaches a predetermined value, a top cover, a protective circuit module within the top cover and on the bare cell, and a thermally insulating top sheet disposed on the thermal fuse, between the thermal fuse and the protective circuit module, the top sheet having a recess configured to receive the thermal fuse, such that the top sheet covers the top surface of the thermal fuse.

Abstract: A battery pack including a bare cell, a metal case covering the outer surface of the bare cell, and a protection circuit board electrically connected to the metal case.

Abstract: Provided is a rechargeable battery capable of easily connecting a terminal and a cap plate to each other. The rechargeable battery includes; an electrode assembly having a positive electrode and a negative electrode; a case receiving the electrode assembly; a cap plate coupled with the case; first and second terminals electrically connected to the electrodes; and a connecting member electrically connecting the first terminal to the cap plate, in which the connecting member may have an elastically deformable structure.

Abstract: A battery module including a battery including a connection terminal; and a battery cell; and a protective circuit module including a printed circuit board having an inner surface that faces the battery, an outer surface that opposes the inner surface, and a terminal opening, and including a conductive pattern around a periphery of the terminal opening and an insulating part around the periphery of the terminal opening, wherein the connection terminal extends from the battery cell to the outer surface of the printed circuit board through the terminal opening, the conductive pattern is coupled with the battery cell through the connection terminal, and the insulating part contacts a portion of the conductive pattern that is closest to the terminal opening.

Abstract: A rechargeable battery includes an electrode assembly in a battery case, and a buffer sheet between the electrode assembly and the battery case, the buffer sheet contacting the electrode assembly and the battery case.

Abstract: A secondary battery, including an electrode assembly; a can housing the electrode assembly; and a cap assembly on the can, wherein the cap assembly includes: a cap plate having a terminal hole and a terminal groove, a gasket on the cap plate having a center hole, and an electrode terminal having a terminal post in the center hole and a plate portion disposed on the gasket; the gasket including a gasket post in the terminal hole and a gasket plate seated in the terminal groove; at least one side of the terminal plate and at least one side of the gasket plate being spaced apart from at least one side of the terminal groove.

Abstract: In this assembled battery, connections between electrode terminals of electrical cells and connection members for the electrode terminal are reliably maintained for a long period of time. The electrode terminal is formed in a tapered pillar shape whose width decreases from the front end of the electrode terminal toward a battery case. Also, a groove, which is shaped from the front end toward the battery case and divides at least a portion of the front end into segmented portions, is provided to the electrode terminal. The segmented portions are elastically deformable to move close to or away from each other. The bus bar (connection member for the electrode terminals) includes a through-hole whose width decreases from the front end of the electrode terminal toward a battery case. The bus bar is fitted to the electrical terminal, by elastically deforming and moving the segmented portions close to each other.

Abstract: A secondary battery includes an electrode assembly having a first electrode plate, a second electrode plate, and a separator disposed between the first and second electrode plates, a case accommodating the electrode assembly, and a cap assembly coupled to the case, the cap assembly including a cap plate sealing the case and having a short-circuit hole, a short-circuit plate covering the short-circuit hole of the cap plate, the short-circuit plate being spaced apart from an outer surface of the cap plate, a reversible plate adjacent the short-circuit hole, and a sealing member between the cap plate and the short-circuit plate.

Abstract: A battery housing is comprised of a unitary, seamless base member having a generally planar, quadrilateral bottom face with a side wall extending therefrom. The length dimension of the bottom face is at least twice the height of the side wall. The base member has an open top face. The housing includes a cover which closes the open top face and is engageable with the side wall of the base. An electrically resistive sealing gasket is configured to contact the cover member and the side wall so as to provide a fluid-tight seal. The components are mechanically interlocked by crimping or hemming. The housing is specifically configured to accommodate stacking of individual batteries into power assemblies, and the geometry of the housing optimizes thermal management. Further disclosed are batteries and battery assemblies including the housing.

Abstract: A battery assembly for use in an electronic device. The battery assembly may include a battery cell, a battery connector for providing power from the battery cell to the electronic device, and a flex circuit electrically coupling the battery cell to the electronic device. The battery connector may be located adjacent the battery cell, and may include one or more alignment mechanisms so that conductive pads connector align properly with corresponding conductive elements of the electronic device. The battery cell may be fixed to the electronic device using an adhesive layer placed between the cell and the electronic device. A tab may extend beyond the periphery of the battery cell to allow a user to pull or peal the battery cell from the electronic device for replacement or repair.

Abstract: A rechargeable battery includes an electrode assembly including a positive electrode including a positive current collector, a positive active material on the positive current collector in a positive coating region, and a positive uncoated region in which the positive active material is not on the positive current collector at a first side of the electrode assembly; a negative electrode including a negative current collector, a negative active material on the negative current collector in a negative coating region, a first negative uncoated region in which the negative active material is not on the negative current collector at the first side of the electrode assembly, and a second negative uncoated region in which the negative active material is not on the negative current collector at a second side of the electrode assembly opposite the first side; and a separator between the positive electrode and the negative electrode.

Abstract: A secondary battery with a protective circuit module including a rechargeable bare cell having a first electrode and a second electrode and a protective circuit board having a protective circuit for the rechargeable bare cell. A conductive bonding layer is located on the protective circuit board and a secondary protective element assembly is attached to the protective circuit board by the conductive bonding layer. A first lead plate electrically connects the secondary protective element assembly to the first electrode, and a second lead plate electrically connects the protective circuit board to the second electrode.

Abstract: According to one embodiment, a battery includes an electrode group, a tab, a conductive nipping member, a case, a lid and a lead. The conductive nipping member includes first and second nipping sections. The first and second nipping sections divide the tab into two bundles in which portions of the tab are laminated onto each other in a thickness direction of the electrode group. The lead includes a connecting section connected electrically to a terminal, and current collecting sections which are two sections branched from the connecting section and sandwiching the nipping member.

Abstract: A rechargeable battery including an electrode assembly including a positive electrode, a negative electrode, and a separator therebetween; a case housing the electrode assembly; a cap plate sealing an opening of the case; and an electrode terminal installed in the cap plate, wherein the electrode terminal includes a first terminal section in a terminal hole of the cap plate, the first terminal being connected to the electrode assembly in the case and including a protruding portion that protrudes outwardly from the cap plate, the protruding portion having a receiving portion therein, a second terminal section in the receiving portion, the second terminal section protruding outwardly from the receiving portion, and a fastening member between an inner peripheral surface of the receiving portion and the second terminal section, the fastening member fastening the first terminal section and the second terminal section to each other.

Abstract: A battery is provided with a plurality of individual cells connected in series and/or in parallel to one another, and at least one cooling plate arranged on the pole side on the individual cells, with current drain tabs of electric poles of the individual cells being thermally coupled with the cooling plate and being angled such that they extend parallel to the cooling plate. Current drain tabs of adjacent individual cells are electrically interconnected in non-positive and/or in positive manner and pressed with the cooling plate in non-positive and/or in positive manner by clamping elements.

Abstract: A material for contact components or battery components, which includes a metal sheet having a surface layer portion containing a first metal element, the metal sheet including a Cr-containing steel plate or a surface-treated steel plate, and at least a part of the first metal element on an outermost surface of the surface layer portion being substituted by a second metal element having a nobler standard electrode potential than the first metal element, the second metal element being deposited on the outermost surface in a state of a particulate metal, oxide, or hydroxide.

Abstract: A battery comprising a housing having a central longitudinal axis. A cover is coupled to the housing and a first flange is integrally formed with the cover and configured to act as a first terminal for the battery. At least a portion of the first flange extends away from the housing in a direction generally perpendicular to the central longitudinal axis. Wherein the first flange is configured for electrical coupling with a terminal of an adjacent battery in a battery system. for electrical coupling with a terminal of an adjacent battery in a battery system.

Abstract: A protective circuit module for a secondary battery includes a circuit board. At least one protection control circuit element for preventing overcharge and over-discharge of the secondary battery is mounted on the circuit board. A first conductive pad is coupled to the circuit board. A positive temperature coefficient device is between the at least one protection control circuit and the first conductive pad such that when a secondary battery temperature reaches a threshold value, resistance of the positive temperature coefficient device is increased and battery current is reduced.

Abstract: A mounting type solid state battery which includes a battery laminate body and a case housing the battery laminate body. The battery laminate body is formed by laminating a positive electrode layer, a solid electrolyte layer and a negative electrode layer in order. The case main body has a base part which supports the battery laminate body. The positive electrode layer and the negative electrode layer are laminated in a direction in which the base part of the case main body extends.

Abstract: In an electrochemical cell including a cathode 7, an anode 6, electrolyte 10, a hollow container 1 accommodating these members, and terminals extending from the inside to the outside of the hollow container 1, the terminals include a plurality of inner terminals 5a formed on the inner surface of the hollow container 1, a cathode outer terminal 5b1 formed on the outer surface of the hollow container 1, and an inner layer wire 5c formed on the inner layer of the hollow container 1 for commonly connecting the plurality of inner terminals 5a to the cathode outer terminal 5b1.

Abstract: The disclosure is directed to an assembled battery that includes a plurality of battery modules and unit cells. The unit cells of each battery module are electrically connected through a plurality of collars placed around a shaft member that secures the battery modules. The shaft member may also electrically connect the unit cells in some embodiments. In other embodiments, axial force from the securing shaft member deforms the collars to create the electrical connections. Alternative embodiments include engagement members secure the battery modules in order to eliminate the need for axial force from a shaft member to complete the assembled battery.

Abstract: A battery apparatus including a case, a battery cell, a battery-side terminal, and an engaging piece. The case has a width, a thickness, and a length. The battery cell is housed in an inside of the case. The battery-side terminal is disposed on a side surface at one end of the case in a length direction and electrically connected to the battery cell. The engaging piece is disposed at the one end of the case at which the battery-side terminal is positioned such that the engaging piece extends in a length direction a same distance as the case at the one end portion. The engaging piece is at an edge of the case in a width direction.

Abstract: A secondary battery for an electronic appliance, including a battery cell. The battery cell has a positive electrode, a negative electrode, and an electrolyte in a pack. A positive electrode terminal and a negative electrode terminal are lead out from the same side face of the pack. A metallic battery can accommodates the battery cell therein such that the side face from which the positive electrode terminal and the negative electrode terminal are lead out is faced towards the opening side. A lid, made of a synthetic resin, in which terminal parts to be connected to the electrodes of the electronic appliance upon being connected to the positive electrode terminal and the negative electrode terminal are faced outwardly, plugs the opening of the battery can, the battery cell being accommodated in the battery can upon being adhered onto an inner face thereof.

Abstract: A secondary battery includes a bare cell including an electrode assembly and a can or a pouch-shaped casing accommodating the electrode assembly and having a stepped portion; a protection circuit board disposed at a side of the bare cell; and a label adhered on a side surface of the bare cell. Further, another secondary battery includes a bare cell; a protection circuit board; an outer case member disposed at a side surface of the bare cell and having a stepped portion; and a label adhered on the outer case member. A label overlapping portion is disposed in the stepped portion formed in an outer surface of a can or a pouch-shaped casing or in an outer case member, and thus it is possible to prevent the secondary battery from being thicker at the label overlapping portion than at other regions and to uniformly maintain the outer thickness of the battery.

Abstract: A rechargeable battery adapted to prevent or reduce overcharge. A rechargeable battery includes a case containing an electrode assembly; a cap plate coupled to the case and sealing an opening of the case; a first electrode terminal connected to a first electrode of the electrode assembly and electrically connected to the case; a second electrode terminal connected to a second electrode of the electrode assembly and electrically insulated from the case when a pressure inside the case is less than a threshold pressure; and a short-circuit unit including a short-circuit member connected to the second electrode terminal, the short-circuit unit adapted to short-circuit the second electrode terminal to the case by swelling a portion of the case to contact the short-circuit member when the pressure inside the case is equal to or greater than the threshold pressure.

Abstract: Disclosed herein is a secondary battery pack including a battery cell having an electrode assembly of a cathode/separator/anode structure mounted in a battery case together with an electrolyte in a sealed state, an insulative mounting member having openings, through which electrode terminals of the battery cell are exposed to the outside, the insulative mounting member being constructed in a structure in which a safety element is mounted to the top of the insulative mounting member, the insulative mounting member being in direct contact with the top of the battery cell, and an insulative cap coupled to the top of the battery cell such that the insulative cap surrounds the insulative mounting member while the safety element is mounted to the insulative mounting member, wherein the battery case is provided at the top thereof with at least one coupling groove, and the insulative mounting member is provided at the bottom thereof with at least one coupling protrusion corresponding to the at least one coupling groo

Abstract: A can for a cylindrical lithium rechargeable battery, and a cylindrical lithium rechargeable battery using the same is provided. The battery includes: an electrode assembly having cathode and anode plates facing to each other, a separator interposed between the cathode and anode plates, and cathode and anode taps formed on the cathode and anode plates, respectively; a can accommodating the electrode assembly; and a cap assembly to seal an opening of an upper end portion of the can. The can has surface plate and a lower plate, and a protrusion is formed on the lower plate so as to increase the contact resistance between the anode tap and the lower plate, when the anode tap is welded to the lower plate.

Abstract: An electrode is provided with a metal terminal extending from a battery module main body, a bolt which has an expanded section configuring a retaining section at a rear end portion and penetrates the metal terminal upward, and an insulating body which insulates the metal terminal and the battery module case one from the other. The insulating body is provided with a drop preventing section which abuts at least a lower surface of the expanded section of the bolt and prevents the bolt from dropping from the metal terminal.

Abstract: A secondary battery in which a fixing tape is attached to an electrode assembly, a positive electrode tab, a negative electrode tab, and a cap plate without use of an insulating case to prevent the electrode assembly from vibrating. The secondary battery includes an electrode assembly including a positive electrode plate to which a positive electrode tab is coupled, a negative electrode plate to which a negative electrode tab is coupled, and a separator interposed between the positive electrode plate and the negative electrode plate, a can having an opened part on one side to accommodate the electrode assembly, a cap assembly sealing the opened part of the can, and a fixing tape continuously attached from the electrode assembly to a bottom surface of the cap assembly while being attached to the positive electrode tab and the negative electrode tab.

Abstract: An electrode is provided with a metal terminal extending from a battery module main body, a bolt which has an expanded section configuring a retaining section at a rear end portion and penetrates the metal terminal upward, and an insulating body which insulates the metal terminal and the battery module case one from the other. The insulating body is provided with a drop preventing section which abuts at least a lower surface of the expanded section of the bolt and prevents the bolt from dropping from the metal terminal.

Abstract: A battery chamber includes: a claw mechanism for a battery including: a movable member that is movable in insertion and removal directions of a battery, and abuts a front face of the battery in the insertion direction when the battery is inserted and completely loaded; an urging member that urges the movable member in the removal direction; and a stopper having: a locking claw that locks a back face of the battery from behind in the insertion direction when the battery is completely loaded, wherein in a case where the battery is inserted, and the movable member is pressed and moved in the insertion direction by the battery, and then an interval in the insertion direction between the movable member and the locking claw becomes a length of the battery in the insertion direction, the locking claw moves from an evacuation position of the locking claw where the locking claw does not interfere with the battery when the battery is inserted to a locking position of the locking claw where the locking claw locks the ba

Abstract: A dummy battery cell has a housing, electrodes arranged within the housing, and terminals which are electrically conductively connected to the electrodes. The dummy battery cell is configured such that the housing is configured to hold an electrolyte. Instead of an electrolyte, however, the dummy battery cell has a filler which does not contain an electrolyte. The filler is effective for the battery cell type. A battery, a battery module and a battery system contain at least one such dummy battery cell.

Abstract: A battery assembly for a medical device includes an elongate cathode, an elongate anode, an electrolyte, and an elongate housing assembly encapsulating the cathode, the anode, and the electrolyte. The battery assembly also includes a first electrode that is exposed from and electrically insulated from the housing assembly. One of the anode and the cathode is electrically coupled to the first electrode, and the other of the anode and the cathode is electrically coupled to the housing assembly. One of the cathode and the anode includes a first portion and a second portion disposed in spaced relationship from the first portion. The other of the cathode and the anode is disposed between the first and second portions.

Abstract: A lithium-ion battery cell includes a cell housing having a base area on which the battery cell is positioned, at least one side face, and two terminals. A first terminal is electrically conductively connected to a cathode of the battery cell, and a second terminal is electrically conductively connected to an anode of the battery cell. The terminals are arranged on at least one side face of the cell housing. A battery cell module includes a plurality of the battery cells. A terminal of a first battery cell makes contact with a terminal of a second battery cell. The disclosure describes a method for producing the battery cell module, in which at least one first and one second battery cell are provided, positioned next to one another, and at least one terminal of the first battery cell is electrically conductively connected to a terminal of the second battery cell.

Abstract: A rechargeable battery includes an electrode group with a separator, a positive electrode, and a negative electrode in a case, a cap plate for sealing the case and including a terminal hole, an electrode terminal extending through the terminal hole, and a lead tab connecting the electrode terminal to the electrode group. The lead tab includes a horizontal part connected to the electrode terminal, a first vertical part and a second vertical part spaced apart from each other and extending from the horizontal part in a vertical direction along the electrode group, and a connection part connecting the first vertical part and the second vertical part, the connection part being spaced apart from the horizontal part to define a gas outlet that overlaps an end part of the electrode group.

Abstract: There is provided a current collector copper foil of negative electrode for lithium ion secondary battery, including: at least 0.15 wt % or more and 0.40 wt % or less of Cr; and Cu as a remaining portion, wherein a Cr solid solution index Z is in a range of 0.05?Z?0.3 and represented by the following formula: Z=(RM?RS)/(RP?RS) . . . (1), wherein RM indicates an actually measured conductivity R (% IACS) of a negative battery current collector copper foil, and RS indicates a calculated value (% IACS) of conductivity R of the negative electrode current collector copper foil 10 in a case that a total content of Cr is solid-soluted, and conductivity RP indicates a calculated conductivity R (% IACS) of the negative electrode current collector copper foil 10 in a case that the total content of Cr is separated.