Abstract: To improve the safety of a secondary battery, the present disclosure provides a secondary battery including: a plurality of battery cells each including a case and an electrode assembly accommodated in the case; a plurality of first bus bars electrically connected to the plurality of battery cells and having a first thickness, the plurality of first bus bars being apart from each other with a predetermined gap therebetween; and a second bus bar arranged above the plurality of first bus bars and electrically connected to the plurality of first bus bars, the second bus bar having a second thickness greater than the first thickness.

Abstract: A socket connector includes a housing having a pin access opening through a bottom open to a cavity configured to receive a pin. The socket connector includes a socket in the cavity electrically connected to a pin. The socket connector includes a latch movably received in a latch pocket to engage the pin to secure the socket connector to the pin. The latch includes a latch release accessible exterior of the housing to release the latch. The latch release moves the latch between a latched position and a clearance position. A latching rib of the latch engages the pin in the latched position and is released from the pin in the clearance position to allow uncoupling of the socket connector from the pin.

Abstract: The disclosure discloses a battery module. The electrical connection between a first electrode of a first battery and a second electrode of a second battery can be realized by setting a jumper electrode connector, thereby facilitating realization of connection relationship of multiple batteries. Moreover, an insulating structure is provided between the jumper electrode connector and the battery. Also, the jumper electrode connector includes a first through hole, the orthographic projection of the first through hole and the orthographic projection of the explosion-proof valve at least partially overlap each other, and the orthographic projection of the first through hole overlaps the orthographic projection of the insulating structure.

Abstract: A battery module improves safety by blocking current when the temperature rises, a battery pack includes the battery module, and a vehicle includes the battery pack. The battery module includes two or more battery cells, an electrode assembly having both ends respectively connected to one ends of electrode leads of opposite polarities in a pouch case together with an electrolyte and other ends of the electrode leads are exposed to an outside of the pouch case, wherein the electrode leads and a bus bar connecting a first battery cell and a second battery cell, wherein the bus bar comprises a metal layer and a material layer that is normally conductive but may act as a resistor when a temperature rises, and wherein the material layer comprises a gas generating material that is decomposed at a certain temperature or higher to generate a gas and increase resistance.

Abstract: A battery terminal connector assembly for attaching to a terminal post of a battery includes a biasing portion and a post engagement portion. The biasing portion has a first terminal post receiving opening. A biasing wall extends about a circumference of the first terminal post receiving opening. The post engagement portion has a second terminal post receiving opening for receiving the battery terminal post therein. Engagement walls extend about a circumference of the second terminal post receiving opening. The biasing portion is movable relative to the post engagement portion between a first insertion position and a second termination position. As the biasing portion is moved from the first insertion position to the second termination position, the biasing wall engages the engagement walls and moves the engagement walls into mechanical and electrical engagement with the battery terminal post positioned in the second terminal receiving opening of the post engagement portion.

Abstract: A battery module includes a cell stack in which a plurality of unit cells including terminal parts are aligned in a first direction and an insulating member surrounds the plurality of unit cells; and a module housing in which a plurality of receiving parts, into each of which the cell stack is configured to be inserted, are provided and are aligned in a first direction and a second direction perpendicular to the first direction, wherein each of the plurality of receiving parts includes a fixing wall around the cell stack and having at least a portion which is in contact with the cell stack. The cell stacks adjacent to each other in the second direction are electrically connected to each other, and the cell stacks adjacent to each other in the first direction are electrically disconnected from each other, when not connected to an end module.

Abstract: A battery module includes a plurality of secondary batteries, each including an electrode assembly and an electrolyte accommodated in an inner space of an exterior case. The battery module also includes an electrode lead having a body and a plate-shaped head portion. A first end of the body is electrically connected to a positive electrode plate or a negative electrode plate of the electrode assembly, and a second end of the body protrudes outward from the exterior case. The plate-shaped head extends in both directions perpendicular to the protruding direction of the body from the second end. The battery module also includes a bus bar having a plate shape with a slit extending inwardly from one end thereof so as to receive a portion of the body. The electrode lead and the bus bar may be at least partially made of an electrically conductive material.

Abstract: A mechanism for electrically contacting a printed circuit board to a battery cell composite system comprises a printed circuit board, at least one bimetallic element which is fastened to the printed circuit board, at least one cell connector for connecting the battery cell composite system to the printed circuit board, wherein the cell connector contacts the at least one bimetallic element with a connecting element, and a fastening element for fastening the connecting element to the at least one bimetallic element.

Abstract: A power supply device disposes an end plate at each end of a battery stack in a stacked direction of the battery stack, and couples a binding bar to the end plate, so as to fix battery cells. The binding bar includes a plate-shaped bar that extends in the stacked direction, and an engagement block that is provided on a plate-shaped bar and protrudes toward an outer peripheral face of the end plate. The engagement block is inserted into a fixing hole provided in the plate-shaped bar and fixed to an inner peripheral face of the fixing hole. The end plate includes a fitting part, to which the engagement block is guided, on the outer peripheral face of the end plate, and includes a stopper that is disposed closer to the battery stack with respect to the fitting part and abuts the engagement block.

Abstract: A battery module includes a housing and a base of the housing. The base includes at least two opposing partition support walls, a first external wall, and a second external wall that is substantially perpendicular to the first external wall. The base also includes two or more partitions extending between the at least two opposing partition support walls to define compartments within the base, wherein each of the two or more partitions extend in alignment with the first external wall and transverse to the second external wall. Further, each of the two or more partitions is coupled to at least one of the at least two opposing partition support walls via a corresponding movable connection configured to be movable between a first position angled away from the first external wall, and a second position angled toward the first external wall.

Abstract: A battery pack including a plurality of battery cells arranged along a first direction; a holder, the holder including terminal holes exposing terminals of the battery cells, and pairs of first plates separated from each other between adjacent terminal holes and pairs of elastic pieces that are bent from the pairs of first plates in opposite directions along the first direction; and bus bars, each of the bus bars including coupling portions at opposite sides thereof and coupled to adjacent terminal holes, and a central bent portion connecting the coupling portions and extending around corresponding pairs of elastic pieces to surround the corresponding pairs of elastic pieces.

Abstract: A vehicle traction battery assembly including a pair of battery cells and a busbar is provided. Each of the battery cells may include a terminal and one or more locating features. The busbar may span between the cells and define a pair of arms each having a member sized to at least partially interlock with the one or more locating features. The busbar may span between the cells such that the busbar covers at least a portion of upper surfaces defined by each of the cells. At least one of the terminal apertures may be spaced in between outer edges of the respective arms such that a first and second surface area provide space sufficient for weld spots.

Abstract: A power supply device having a battery block with a terminal surface on which terminals of a plurality of battery cells are arranged side by side, and a side plate with an elastic part, a holding part and a body part that extends along the side surfaces of the battery block. The elastic part faces the terminal surface and the holding part faces the bottom surface of the battery block. An insulation part is disposed between the elastic part and the battery block and has a positioning region and a pressing region that are disposed on one surface of the insulation part so as to face the elastic part. The positioning region is provided at an end of the insulation part located at the body part side, and extends to a position that is separated farther away from the elastic part than the pressing region.

Abstract: A secondary battery module incudes a secondary battery, a secondary battery laminate, a busbar, and one pair of lashing plates. The one pair of lashing plates is provided on either end of the secondary battery laminate in a laminating direction. The one pair of lashing plates is connected via a cell block provided so as to face the narrow surface of the secondary battery. The secondary battery laminate is lashed in a state of being pressed in the laminating direction.

Abstract: A battery pack including a plurality of battery cells; and a rigid printed circuit board (PCB) electrically connected to each battery cell and extending across the plurality of battery cells, wherein the rigid PCB includes a bus to electrically connect the plurality of battery cells to each other, and a battery management system (BMS) to control a charge/discharge operation of the plurality of battery cells.

Abstract: In a laser welding step, a laser beam is irradiated fin a thickness direction of an external terminal from a side of a front surface of a bus bar toward a space. This irradiation melts a separated portion of the external terminal, i.e., a portion located apart from the insulating part by the space between the insulating part and the separated portion in the thickness direction, and an opposed portion of the bus bar, i.e., a portion opposed to the space via the separated portion in the thickness direction, thereby forming a welded portion including the separated portion and the opposed portion melted together.

Abstract: Provided is an energy storage device which can sufficiently reduce a resistance of a current path. An energy storage device includes: an outer case having a lid plate on which an external terminal is mounted; a plate having a tab and housed in the outer case; a conductive shaft portion penetrating the lid plate and having one end thereof connected to the external terminal; and a conductive plate portion housed in the outer case, and having a first surface to which the other end of the conductive shaft portion is connected and a second surface to which the tab is connected, wherein a size of the conductive plate portion and a size of the tab are respectively set larger than a size of the external terminal in a planar direction of the lid plate.

Abstract: A prismatic secondary battery including a battery container containing an electric storage element and having first and second wide surfaces and an opening; a lid having first and second through holes and a centerline extending along a length of the lid; a first and second flat plate-like current collector plate inserted into the first and second through holes made of metal materials. A first insertion position of the first current collector plate is spaced at a first distance from the centerline of the lid, the first distance extending in a direction parallel to a top surface of the lid from the centerline toward the first wide surface. A second insertion position of the second current collector plate is spaced at a second distance from the centerline, the second distance extending in a direction parallel to the top surface of the lid.

Abstract: A wiring module that can account for tolerance in an alignment direction of a plurality of power storage devices includes: a first unit row including a plurality of first units linked by a first warping linking portion and a first slide linking portion that enable adjustment of an interval between the plurality of first units, the first warping linking portion having a warping portion and the linking portion having an inner wall and an outer wall; a second unit row including a plurality of second units linked by a second linking portion having an inner wall and an outer wall and enables adjustment of an interval between the plurality of second units, the second unit row being disposed side-by-side with the first unit row; and a row linking portion that has a variable row-interval portion that enables adjustment of an interval between the first and the second unit rows.

Abstract: A welding step involves solid-state welding together an external terminal and a seat portion of an internal terminal by causing the external terminal or the internal terminal to vibrate while detaching an insulator from the external terminal in at least a region surrounding the seat portion and pressing the external terminal against the seat portion.

Abstract: A battery module includes: a battery cell stack including a plurality of battery cells respectively having electrode leads, the plurality of battery cells being stacked on one another; and an interconnect board (ICB) cover to which an electrode lead connection that is bent is coupled, the electrode lead connection comprising an electrode lead of any one of the plurality of battery cells and an electrode lead of another battery cell adjacent to the any one battery cell connected to each other, wherein a plurality of the ICB covers is provided, and the plurality of ICB covers are arranged in different layers.

Abstract: A battery pack fixing apparatus which may effectively prevent a battery pack from being detached or separated from the fixing apparatus and may ensure easy installation regardless of the place where the battery pack is mounted, including a support unit supporting a lower portion of the battery pack and having a support plate with a coupling structure coupled to the lower portion of the battery pack; and a wall fixing unit including a fixing plate located at the rear of the battery pack loaded on the support unit, formed with a plate shape erecting upward, having a lower portion coupled to one side of the support unit and having a coupling structure coupled to a wall located at the rear.

Abstract: A battery module includes battery stacks, a first restraining part, and a plurality of second restraining parts. The first restraining part has: a flat plate part; a plurality of first wall parts that protrude from a main surface of the flat plate part, extend in a stacking direction of the batteries, and are arranged in a first direction; and second wall parts extending in the first direction at end parts of each wall part. The second restraining parts are disposed individually corresponding to the first wall parts and each have: a belt part extending parallel to the flat plate part; a third wall part protruding from the belt part toward the first wall part and extending in the stacking direction; and fourth wall parts extending in the first direction at end parts of the third wall part. There are arranged a plurality of housing spaces for the battery stacks.

Abstract: A method of forming batteries includes feeding a foil through a coating machine. The movement of the foil defines a foil direction. The method applies a first coating band and a second coating band to the foil. The second coating band is spaced from the first coating band by a first tab gap. The foil is cut substantially perpendicular to the foil direction to separate a first coated blank. The first coated blank is cut separate the first coating band and a first portion of the first tab gap, and to separate the second coating band and a second portion of the first tab gap. A first electrode is formed from the first coating band and the first portion of the first tab gap, and a second electrode is formed from the second coating band and the second portion of the first tab gap.

Abstract: A terminal connection structure includes: an output terminal protruding from a surface of an exterior can of a battery and having an inclined surface, in a state that battery and a connection object are aligned, the inclined surface being inclined so as to be away from or close to the surface toward the connection object; and a bus bar having connection surface parallel to the inclined surface on one end side, surface contact between the connection surface and the inclined surface causing the one end side to be electrically connected to the output terminal, another end side being electrically connected to the connection object.

Abstract: A battery cell frame according to an embodiment of the present disclosure includes a bus bar for electrically coupling to an electrode lead of a battery cell, a support member coupled to the bus bar and configured to come into contact with the battery cell to support the battery cell, and a variable length part formed in the support member. The variable length part is configured to change in length to fit a size of the battery cell.

Abstract: When a non-aqueous electrolyte secondary battery in which a positive electrode active material comprising a layered lithium-composite oxide is used for a positive electrode is subjected to charge/discharge under a prescribed condition, in a graph showing the relationship between voltage “V” with discharge during 5th cycle and value dQ/dV from differentiation of battery capacity “Q” with discharge during 5th cycle by voltage “V”, peak intensity ratio “r” represented by the equation: r=|Ic|/(|Ia|+|Ib|+|Ic|) satisfies 0<r?0.25, in which |Ia| is absolute value dQ/dV for a peak top within a range of more than 3.9V to 4.4V or less, |Ib| is absolute value dQ/dV for a peak top within a range of more than 3.5V to 3.9V or less, and |Ic| is absolute value dQ/dV for a peak top within a range of 2.0V or more to 3.5V or less.

Abstract: A cell pack including: a plurality of unit cells arranged in an arrangement direction, each unit cell including a cell case accommodating an electrode body and an electrolytic solution; and a spacer disposed between two unit cells adjacent to each other in the arrangement direction. The cell case has a side surface facing the spacer. At least one of the side surfaces has a pressing region pressed by the spacer and a non-pressing region not pressed by the spacer. An expanding portion bulging in a direction of approaching the spacer is provided in the non-pressing region of the cell case, and a gap between the cell case and the spacer is reduced by the expanding portion.

Abstract: The present invention is to make it possible to effectively recover regenerative energy and improve a fuel efficiency. Thus, there is provided an HCM 50 of a hybrid vehicle, in which the hybrid vehicle includes: an engine; a drive wheel to which a driving force of the engine is transmittable; a motor to which the driving force from the engine is transmittable and which is capable of transmitting a driving force to the drive wheel; and a battery which supplies power for driving the motor and stores power generated by the motor.

Abstract: A method for assembling a battery pack having a cell group includes stacking the plurality of the unit cells such that distal end portions of the electrode tabs of the unit cells are bent along a stacking direction, disposing a pair of first cover members both ends of the unit cells in the stacking direction, disposing a pair of second cover members on both ends of the unit cells in a direction that intersects with the stacking direction, welding the first and second cover members while the cell group is pressurized using the first cover members. The welding of the first cover members and the second cover members is performed prior to electrically connecting the unit cells by a bus bar. The method further includes laser-welding the bus bar to distal end portions of the electrode tabs after the first cover members and the second cover members are welded.

Abstract: An example electric vehicle battery current communication device includes a terminal landing and a transition from the terminal landing having an area that is both bent and tapered. The transition can bend toward an interior of a battery cell such that a portion of the transition is closer to the interior than each portion of the terminal landing. The terminal landing can attach to a bus bar. The terminal landing can also weld to a bus bar. The transition can extend from the terminal landing to a current collector extending into an interior of the battery cell.

Abstract: A secondary battery is disclosed. According to the present invention, when an internal pressure exceeding a certain level occurs, current may be interrupted to stop an operation of the secondary battery, thereby preventing the secondary battery from being ignited or exploded by the increase in internal pressure of the secondary battery and improving safety of the secondary battery.

Abstract: A bus bar module includes a plurality of bus bars and a bus bar holder. The bus bar holder is constituted by coupling a plurality of holding portions in a chain manner via deformable coupling portions, respectively, the plurality of holding portions each holding the bus bar in a movable manner in predetermined ranges determined by restriction of movement of the bus bar by interferences with movement restricting members. Openings allowing two contact portions of the bus bar held by the holding portion to be exposed to an outside, the two contact portions being respectively connected to the electrodes of the two adjacent battery cells, are provided in either the holding portion or the coupling portion.

Abstract: Provided are battery packs and interface modules for electrically interconnecting electrochemical cells in the packs and for providing heat distribution with the packs. An interface module interfaces one side of all electrochemical cells in a battery pack. The interface module may have a substantially planar shape such that the space occupied by the module in the battery pack is minimal. Most, if not all, conductive components of the interface module may be formed from the same sheet of metal. In some embodiments, the interface module includes multiple bus bars such that each bus bar interconnects two or more terminals of different electrochemical cells in the battery pack. Each bus bar may have a separate voltage sense lead extending from the bus bar to a connecting portion. The bus bars may be flexibly supported within the module. The interface module may also include multiple thermistors disposed on different bus bars.

Abstract: Provided is a busbar configured to establish a connection between adjacent electrode terminals of a plurality of electricity storage elements each including positive and negative electrode terminals, including: a central region and a pair of end regions that are separated by a pair of parallel folding lines extending along an arrangement direction of the adjacent electrode terminals, wherein the pair of end regions are folded using the folding lines, and are placed on top of one surface of the central region such that the end regions do not overlap with each other.

Abstract: A battery interconnect may include a desired current capacity, integrated fusible links, and be manufacturable using cost effective techniques. In some embodiments, a battery interconnect includes a busbar and relatively thinner links. A busbar carries larger currents and accordingly its cross-sectional areas are relatively larger to reduce ohmic losses. A link carries a much smaller current, and a fusible link is configured to break the circuit when the current is above a threshold, thus requiring a relatively small cross-sectional area. These sometime disparate length scales are addressed using several techniques such as layering a busbar and a foil sheet and pressing portions of a busbar to form the links. The links can be affixed to a plurality of battery cells to connect the cells in parallel or series.

Abstract: A battery module comprising sub-module components, or bricks, that facilitate efficient assembly utilizing common hand tools and provide integrated cooling features for increased battery configurability and performance.

Abstract: A power storage device includes an electrode assembly, an accommodation case accommodating the electrode assembly, an external terminal provided on an outer surface of the accommodation case, a collector terminal connecting the electrode assembly and the external terminal, and a welding portion connecting the collector terminal and the external terminal. The external terminal includes an opposed surface opposed to the outer surface and an outer surface located opposite to the opposed surface. The external terminal has an insertion hole extending from the opposed surface toward the outer surface and a step portion located around an opening in the insertion hole located on a side of the outer surface. The collector terminal includes a contact surface in contact with a surface of the step portion. The welding portion is formed to weld the surface of the step portion and the contact surface.

Abstract: An energy storage apparatus includes: energy storage devices each including an external terminal, the energy storage devices being arranged in a first direction; a bus bar including a plate-like conductive portion; and a neighboring member disposed between the energy storage devices. The conductive portion includes: a fusible portion where a width size, which is a size in a second direction orthogonal to the first direction, is defined by a pair of edges, the width size being smaller than a width size of other portions of the conductive portion; and a pair of enlarged width portions contiguously formed with both sides of the fusible portion in the first direction, a width size of the pair of enlarged width portions increasing in a direction away from the fusible portion.

Abstract: A cell structure of the present invention includes first and second sheet shaped cells, each including a first electrode and a second electrode, and an insulating member arranged between the first and second sheet shaped cells. Here, the second electrode of the first sheet-shaped cell and the second electrode of the second sheet-shaped cell face each other. The first sheet shaped cell includes a tab portion extended on an XY plane to outside of the second sheet shaped cell and the second sheet shaped cell includes a tab portion extended on the XY plane to outside of the first sheet shaped cell. The second electrodes are connected through a tab lead arranged from the tab portion to the tab portion.

Abstract: An exemplary busbar forming method includes, among other things, creasing a sheet of material to form a plurality of creases that partition the sheet into a plurality of segments. The method further includes identifying a desired size for a terminal receiving recess in a busbar. In response to the desired size, the method folds at least some of the segments relative to each other about at least some of the creases according to a first process, or a different, second process. An exemplary battery assembly includes, among other things, a busbar formed from a sheet of material. The busbar has a terminal receiving recess. Creases are formed within the sheet that partition at least a portion of the sheet into a plurality of segments. Some of the segments are folded relative to each other about at least some of the creases to provide the terminal receiving recess in the busbar.

Abstract: A battery module having a low height and ensuring stable cooling performance, including a heat dissipation member disposed at a lower portion thereof, a cell assembly having a plurality of can-type secondary batteries stacked in a lying-down form in a horizontal direction and a bus bar, the bus bar including a connection part contacting electrodes of two or more can-type secondary batteries of the cell assembly to electrically connect the two or more can-type secondary batteries, and a heat transfer part located below the connection part to contact the heat dissipation member to transfer heat of the secondary batteries to the heat dissipation member.

Abstract: An energy storage system for a vehicle is provided. The system includes a plurality of energy storage devices that are arranged to provide output power to a vehicle and are connected in parallel with each other. A plurality of sub-relays are connected to the plurality of energy storage devices, respectively. A controller then measures the degrees of deterioration of the respective energy storage devices and selectively opens or closes the sub-relays based on the amount of output power required for a vehicle and the measured degrees of deterioration such that a sub-relay connected to an energy storage device having a low degree of deterioration is closed first.

Abstract: Provided is a battery pack in which multiple battery cells are electrically connected by using bus bars, with little resistance variability and without plating of electrode external terminals. A method for producing a battery pack disclosed herein includes: a step of stacking a plurality of battery cells each having a battery case and electrode external terminals provided outside the battery case; and a step of electrically connecting the electrode external terminals of the plurality of battery cells by using metal-made bus bars. The electrode external terminals are not plated. The method for producing a battery pack further includes forming a fresh surface of terminal material at each surface of the electrode external terminals; and bringing the fresh surface and each metal-made bus bar into contact with each other.

Abstract: A storage battery rack includes bottom frame portion, ceiling frame portion, long support posts, and side panels installed facing the support posts. Each support post has a plurality of attachment holes with a predetermined pitch along the longitudinal direction. Side panel has a plurality of female screw holes with a pitch corresponding to the predetermined pitch. Each side panel is attached to a pair of the support posts with screws fastened to attachment holes and the female screw holes. Side panel has a plurality of parallel support portions. A distance between support portions is set substantially equal to a total value of a predetermined height dimension of a refrigerant passage formed between a plurality of storage batteries and a predetermined height dimension of each storage battery.

Abstract: The present disclosure provides a battery cap assembly, a secondary battery and a battery module. The battery cap assembly comprises: a cap plate, including a second terminal hole; a first electrode terminal, at least a part of which protruding above the cap plate; a second electrode terminal, including a second protruding portion protruding above the cap plate and a second base portion connected with the second protruding portion. The first electrode terminal is provided with a protrusion used for welding with a first connecting piece; the second protruding portion is used for welding with a second connecting piece to form a welding portion, and a projection of the welding portion in an up-down direction is positioned in a cross-section of the second base portion. The secondary battery comprises a case, an electrode assembly and the battery cap assembly. The battery module comprises the first connecting piece and the secondary batteries.

Abstract: A cell state acquisition apparatus and a power battery using the cell state acquisition apparatus. A cell state acquisition apparatus having an acquisition board assembly, a first interface fixed at the bottom surface of a cell, a second interface fixed at the top end of another cell and a connecting seat connecting the first interface and the second interface; the acquisition board assembly including a PCB board, a signal processing module and a communication module mounted on the PCB board and a fixed block which is matched to be inserted in the first interface; and a signal acquisition module which is used for acquiring a cell state signal corresponding to the second interface is mounted on the fixed block.

Abstract: An insulating casing for battery terminals including a base and a top cover, wherein the base is engaged with a battery pack and includes a bottom plate. The bottom plate has a plurality of perforations adapted to be passed through by the terminals of the battery pack. The top cover is detachably engaged with the base, and a chamber communicating with the perforations is formed between the top cover and the base, and the terminals are received into the chamber whereby an insulating casing to protect the terminals of the battery pack is provided.

Abstract: A battery module includes multiple cell laminations and a conductive plate. The cell laminations are laminated along vertical direction and includes at least a first cell lamination and a second cell lamination. Each cell lamination includes several cells laminated together and a busbar, the busbar includes a connection portion and a current-flow portion, the connection portion electrically connects with lugs of the cells, and further connects with the current-flow portion. The conductive plate is located beside the cell laminations. A first end of the conductive plate at least electrically connects with the current-flow portion of the busbar in the first cell lamination, and a second end thereof at least electrically connects with the current-flow portion of the busbar in the second cell lamination. The present disclosure provides a battery module which can solve the problem of impossible to consider current-flow ability, energy density and welding effect simultaneously.

Abstract: The present disclosure provides a cap assembly for a secondary battery and a secondary battery. The cap assembly includes a cap plate, a fixing member, a connecting member and an electrode terminal, wherein the cap plate has an electrode lead-out hole; the fixing member is fixed to the cap plate through the connecting member and provided with a weakened portion that is close to a center line of the cap plate in a width direction of the cap plate; and the electrode terminal includes a terminal board, wherein the terminal board has an outer peripheral surface at least partially surrounded by the fixing member so that the electrode terminal is fixed to the fixing member, and the terminal board is provided on a side of the cap plate and covers the electrode lead-out hole.