Battery, power utilization device, vehicle and single battery

Abstract

The embodiment of the utility model provides a battery, an electric device, a vehicle and a battery monomer, the battery comprises a battery monomer group and a bus member, the battery monomer group comprises a plurality of battery monomers arranged along a first direction, and each battery monomer comprises a plurality of electrode lead-out parts; and in a projection plane perpendicular to the first direction, the projections of the at least two electrode lead-out parts on the same battery monomer at least partially coincide. According to the battery provided by the embodiment of the utility model, the electrode lead-out parts of the same battery monomer are at least partially overlapped in the projection plane perpendicular to the first direction, so that the arrangement positions of all the electrode lead-out parts in the battery are more concentrated and compact; therefore, a relatively regular space can be formed in the battery so as to arrange other devices such as the confluence piece and the sampling assembly in the battery, the space utilization rate in the battery can be improved, the arrangement of the confluence piece can be more concentrated, and concentrated protection on a connection area of the confluence piece is facilitated.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of batteries, and particularly to a battery, an electrical device, a vehicle, and a battery cell. Background Art

[0002] In recent years, the new energy industry has been booming. Batteries are an essential part of the new energy industry.

[0003] A battery includes a bus bar and a plurality of battery cells. The battery cell is provided with electrode lead-out portions. The bus bar electrically connects the electrode lead-out portions of different battery cells to realize the series and parallel connection of the conduction paths of each battery cell with each other. The electrode lead-out portions on the battery cell include two polarities, namely, a positive electrode and a negative electrode. The bus bar needs to connect the electrode lead-out portions with different polarities on different battery cells.

[0004] On the same battery cell, due to the difference in the arrangement positions of the electrode lead-out portions of the positive electrode polarity and the negative electrode polarity, the arrangement of the electrode lead-out portions in the entire battery is relatively scattered, which is not conducive to the adaptation of other devices in the battery to the positions of each electrode lead-out portion, and increases the assembly difficulty. Summary of the Utility Model

[0005] In view of this, the embodiments of the present utility model are expected to provide a battery, an electrical device, a vehicle, and a battery cell that are conducive to the centralized arrangement of electrode lead-out portions.

[0006] To achieve the above object, the technical solution of the embodiments of the present utility model is realized as follows:

[0007] The embodiments of the present utility model provide a battery, which includes:

[0008] A battery cell group, including a plurality of battery cells arranged in a first direction, and the battery cell includes a plurality of electrode lead-out portions;

[0009] A bus bar, which is connected to the electrode lead-out portions of the battery cells arranged adjacent to each other in the first direction;

[0010] In a projection plane perpendicular to the first direction, the projections of at least two electrode lead-out portions on the same battery cell at least partially overlap.

[0011] In the battery according to the embodiment of the present utility model, at least partial coincidence is achieved in the projection plane perpendicular to the first direction by the electrode lead-out portions of the same battery cell, which is conducive to making the arrangement positions of the electrode lead-out portions on the same battery cell more concentrated and compact. Thus, it is conducive to forming a relatively regular space in the battery to reserve a more regular space for arranging other components in the battery, such as bus bars and sampling components, which is conducive to improving the space utilization rate in the battery, facilitating the neat arrangement of various components in the battery, and conducive to improving the production and assembly efficiency of the battery. In addition, the arrangement of the bus bars can also be more concentrated, facilitating the centralized protection of the connection areas of the bus bars.

[0012] In some embodiments, in the projection plane perpendicular to the first direction, the projections of the electrode lead-out portions respectively located on two adjacent battery cells along the first direction at least partially coincide. In this way, it is possible to make the arrangement positions of all the electrode lead-out portions within the same battery cell group more concentrated and compact, which is conducive to forming a relatively regular space in the battery to reserve a more regular space for arranging other components in the battery, such as bus bars and sampling components, conducive to improving the space utilization rate in the battery, facilitating the neat arrangement of various components in the battery, and conducive to improving the production and assembly efficiency of the battery.

[0013] In some embodiments, the battery cell group includes a first battery cell and a second battery cell adjacent to each other along the first direction. The electrode lead-out portion includes a first electrode lead-out portion located on the first battery cell and a second electrode lead-out portion located on the second battery cell. In the projection plane perpendicular to the first direction, the projections of the first electrode lead-out portion and the second electrode lead-out portion along the first direction at least partially coincide with each other. The bus bar extends along the first direction to connect the overlapping portions of the projections of the first electrode lead-out portion and the second electrode lead-out portion along the first direction. In this way, by making the first electrode lead-out portion and the second electrode lead-out portion at least partially coincide in the first direction, the arrangement of the electrode lead-out portions on adjacent battery cells can be relatively concentrated, facilitating electrical connection. Moreover, it is also conducive to shortening the distance between the first electrode lead-out portion and the second electrode lead-out portion that the bus bar needs to electrically connect, thereby reducing the size of the bus bar, which is conducive to reducing the resistance of the bus bar and improving the current-carrying capacity of the bus bar.

[0014] In some embodiments, the first battery cell includes a first edge and a second edge opposite to each other along the first direction. The first edge is closer to the second battery cell than the second edge. The maximum distance between the first electrode lead-out portion and the first edge is less than the maximum distance between the first electrode lead-out portion and the second edge. In this way, it is conducive to making the first electrode lead-out portion closer to the second electrode lead-out portion along the first direction, enabling the arrangement of the electrode lead-out portions that need to be point-connected by the bus bar to be more concentrated, which is conducive to further shortening the size required for the bus bar to electrically connect the first electrode lead-out portion and the second electrode lead-out portion, thereby further reducing the resistance of the bus bar.

[0015] In the same embodiment or another embodiment, the second battery cell includes a third edge and a fourth edge that are opposed to each other in a first direction. The third edge is closer to the first battery cell than the fourth edge. The maximum distance between the second electrode lead-out portion and the third edge is less than the maximum distance between the second electrode lead-out portion and the fourth edge. Thus, it is beneficial to make the second electrode lead-out portion closer to the first electrode lead-out portion in the first direction, and the electrode lead-out portions that need to be electrically connected through the bus bar can be arranged relatively concentratedly, which is beneficial to further shorten the size required for the bus bar to electrically connect the first electrode lead-out portion and the second electrode lead-out portion, and thus is beneficial to further reduce the resistance of the bus bar.

[0016] In some embodiments, the first electrode lead-out portion includes a first connection portion connected to the bus bar;

[0017] The first battery cell includes a first edge and a second edge that are opposed to each other in a first direction. The first edge is closer to the second battery cell than the second edge. The maximum distance between the first connection portion and the first edge is less than the maximum distance between the first connection portion and the second edge. Thus, it is beneficial to make the first connection portion closer to the second electrode lead-out portion in the first direction, which is beneficial to further shorten the size required for the bus bar to electrically connect the first electrode lead-out portion and the second electrode lead-out portion, and thus is beneficial to further reduce the resistance of the bus bar.

[0018] In some embodiments, the maximum distance between the first connection portion and the first edge is D1, and the maximum distance between the first connection portion and the second edge is D2. D1 and D2 satisfy: D2≥2*D1, D1≥3mm. Thus, on the one hand, it is beneficial to make the first connection portion have a sufficient distance from the first edge so that the first electrode lead-out portion can be installed; on the other hand, it enables the first connection portion to be closer to the second electrode lead-out portion in the first direction, which is beneficial to further shorten the size required for the bus bar to electrically connect the first electrode lead-out portion and the second electrode lead-out portion, and thus is beneficial to further reduce the resistance of the bus bar.

[0019] In some embodiments, the maximum dimension of the first battery cell in the first direction is D, the maximum distance between the first connection portion and the first edge is D1, and the maximum distance between the first connection portion and the second edge is D2. D, D1, and D2 satisfy: D1≥3mm, D2≥0.5*D + 3mm. Thus, on the one hand, it is beneficial to make the first connection portion have a sufficient distance from the first edge so that the first electrode lead-out portion can be installed; on the other hand, it is beneficial to set another electrode lead-out portion on the first battery cell on the side where the first electrode lead-out portion is away from the second battery cell in the first direction and has a dimension similar to that of the first electrode lead-out portion in the first direction.

[0020] In some embodiments, in a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portion and the second electrode lead-out portion along the first direction are at least partially misaligned with each other. In this way, while facilitating the electrical connection of the bus bar to the overlapping portion of the first electrode lead-out portion and the second electrode lead-out portion along the first direction, it is beneficial to utilize the non-overlapping portions of the two along the first direction to connect to other components in the battery, such as the tabs within the battery cell or the sampling assembly outside the battery cell, so as to reduce the probability of interference of these components with the electrical connection between the bus bar and the first electrode lead-out portion.

[0021] In some embodiments, the bus bar is connected to the first electrode lead-out portion and the second electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction in pairs;

[0022] The dimension of the overlapping portion of the first electrode lead-out portion with the projection of the second electrode lead-out portion along the first direction in the third direction is L1, and the dimension of the misaligned portion of the first electrode lead-out portion with the projection of the second electrode lead-out portion along the first direction in the third direction is L2, and L1≥L2. In this way, when the dimension of the first electrode lead-out portion in the third direction is fixed, the dimension of the connection region between the bus bar and the first electrode lead-out portion in the third direction can be increased, which is beneficial to increasing the dimension of the bus bar in the third direction, and further beneficial to increasing the cross-sectional area of the current passing through the bus bar and reducing the resistance of the bus bar.

[0023] In some embodiments, L1≥2*L2. In this way, it is beneficial to further increase the dimension of the bus bar in the third direction, and further beneficial to increasing the cross-sectional area of the current passing through the bus bar and further reducing the resistance of the bus bar.

[0024] In some embodiments, the bus bar is connected to the first electrode lead-out portion and the second electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction in pairs;

[0025] The dimension of the first electrode lead-out portion in the third direction is greater than the dimension of the first electrode lead-out portion in the first direction. In this way, it is beneficial to increase the dimension of the bus bar in the third direction, thereby increasing the area of the cross-section of the bus bar perpendicular to the first direction, beneficial to reducing the resistance of the bus bar, improving the current-carrying capacity of the bus bar, and improving the heat generation problem of the bus bar in the energized state.

[0026] In some embodiments, the dimension of the first electrode lead-out portion in the third direction is greater than or equal to 2 times the dimension of the first electrode lead-out portion in the first direction. In this way, it is further beneficial to increase the dimension of the bus bar in the third direction, thereby increasing the area of the cross-section of the bus bar perpendicular to the first direction, beneficial to further reducing the resistance of the bus bar, improving the current-carrying capacity of the bus bar, and improving the heat generation problem of the bus bar in the energized state.

[0027] In some embodiments, the bus bar is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the second direction is perpendicular to the first direction;

[0028] The cross-section perpendicular to the first direction of the portion of the bus bar that coincides with the first electrode lead-out portion in the projection along the second direction is the first cross-section, and the cross-section perpendicular to the first direction of the portion of the bus bar located between the first electrode lead-out portion and the second electrode lead-out portion is the second cross-section. The minimum thickness of the first cross-section along the second direction is less than the minimum thickness of the second cross-section along the second direction. In this way, on the one hand, by reducing the size of the portion of the bus bar that coincides with the first electrode lead-out portion in the projection along the second direction, it is beneficial to reduce the welding difficulty between the bus bar and the first electrode lead-out portion and improve the welding strength between the bus bar and the first electrode lead-out portion; on the other hand, it is beneficial to increase the cross-sectional area of the portion of the bus bar that does not need to be welded in the direction perpendicular to the first direction, which is beneficial to improving the current-carrying capacity of the bus bar.

[0029] In some embodiments, the bus bar includes multiple layers of sub-bus bars that are stacked and connected to each other along the second direction. The adjacent two layers of sub-bus bars in the third direction are connected at one end, and the third direction is perpendicular to the first direction and the second direction pairwise. In this way, by stacking the multiple layers of sub-bus bars on top of each other along the second direction, the total size of the bus bar along the second direction can be increased, which is beneficial to increasing the cross-sectional area of the bus bar perpendicular to the first direction, thereby reducing the resistance of the bus bar and improving the current-carrying capacity of the bus bar.

[0030] In some embodiments, the layer of the multiple layers of sub-bus bars closest to the first electrode lead-out portion is connected to the first electrode lead-out portion, and through holes or through grooves penetrating along the second direction are provided in the regions where the other layers of the multiple layers of sub-bus bars coincide with the first electrode lead-out portion in the projection along the second direction. In this way, during the operation of welding the bus bar and the electrode lead-out portion, only one bus bar needs to be welded to the electrode lead-out portion, which is convenient for the heat of welding to quickly penetrate through the bus bar, beneficial to improving the welding efficiency, and beneficial to improving the connection strength of the welding.

[0031] In some embodiments, the first battery cell further includes a third electrode lead-out portion. In a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction at least partially overlap, and the first electrode lead-out portion and the third electrode lead-out portion are asymmetric structures with respect to the center of the wall surface where they are located. In this way, on the one hand, it can play a certain anti-fooling role, facilitating the identification that the placement direction of a single battery cell is different from that of other battery cells, and reducing the probability of short circuit between two adjacent battery cells; on the other hand, the first electrode lead-out portion and the third electrode lead-out portion can be asymmetric structures on the wall surface where they are located, and do not need to be symmetric structures, so the position setting of the electrode lead-out portions can be more flexible. For example, multiple electrode lead-out portions on the same battery cell can be biased to one side to form a larger area of free space on this wall surface for arranging other devices in the battery.

[0032] In some embodiments, the second battery cell further includes a fourth electrode lead-out portion. In a projection plane perpendicular to the first direction, the projections of the second electrode lead-out portion and the fourth electrode lead-out portion along the first direction at least partially overlap;

[0033] Both the first electrode lead-out portion and the third electrode lead-out portion are located on the first wall surface of the first battery cell, and both the second electrode lead-out portion and the fourth electrode lead-out portion are located on the second wall surface of the second battery cell, and the first wall surface and the second wall surface face the same direction;

[0034] The relative positions of the second electrode lead-out portion and the fourth electrode lead-out portion on the second wall surface are the same as the relative positions of the first electrode lead-out portion and the third electrode lead-out portion on the first wall surface.

[0035] In this way, it is beneficial to simplify the design of two adjacent battery cells in the battery cell group, reduce the production and manufacturing costs. At the same time, it is beneficial to reduce the size of the busbar connecting the electrode lead-out portions of different battery cells, and is beneficial to reducing the resistance of the battery cell.

[0036] In some embodiments, in a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction are at least partially misaligned. In this way, the creepage distance between the two misaligned portions of the projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction is increased. Thus, it is beneficial to electrically connect electrical connection devices with a large creepage distance requirement in the battery, such as different sampling terminals of the sampling component, different-polarity pole tabs, etc., to the misaligned portion of the first electrode lead-out portion and the misaligned portion of the third electrode lead-out portion respectively, so as to improve the safety of battery use.

[0037] In some embodiments, the busbar is connected to the first electrode lead-out portion and the second electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction pairwise;

[0038] The first electrode lead-out portion has a first end portion in the third direction. In the projection plane perpendicular to the first direction, the projection of the first end portion along the first direction is misaligned with the projection of the third electrode lead-out portion along the first direction. The third electrode lead-out portion has a second end portion in the third direction. In the projection plane perpendicular to the first direction, the second end portion is misaligned with the first electrode lead-out portion along the first direction.

[0039] The first battery cell further includes a housing, a first internal connection member, and a second internal connection member. The first internal connection member is located inside the housing and connected to the first end portion, and the second internal connection member is located inside the housing and connected to the second end portion.

[0040] In this way, it is beneficial to increase the creepage distance between the first internal connection member and the second internal connection member, reduce the risk of short circuit between the two, and improve the use safety of the battery.

[0041] In some embodiments, the first end portion protrudes toward the third electrode lead-out portion along the first direction, and / or the second end portion protrudes toward the first electrode lead-out portion along the first direction. In this way, it is beneficial to increase the size of the first end portion when the sizes of the first electrode lead-out portion and the third electrode lead-out portion along the first direction are fixed, beneficial to increase the size of the connection area between the first end portion and the first internal connection member, improve the current-carrying capacity, and beneficial to make the arrangement of the first electrode lead-out portion and the third electrode lead-out portion more compact; at the same time, it is beneficial to increase the total outer surface area of the first electrode lead-out portion and the third electrode lead-out portion, beneficial to improve the heat generation situation of the first electrode lead-out portion and the third electrode lead-out portion during the current passing process, and enhance the use safety of the battery.

[0042] In some embodiments, the battery cell further includes a housing and an electrode assembly. The housing has an accommodation space, and the housing includes a first housing wall. At least part of the electrode assembly is disposed in the accommodation space;

[0043] Along the wall thickness direction of the first housing wall, the electrode lead-out portion is disposed on the first housing wall. The electrode lead-out portion includes a first electrode lead-out portion and a third electrode lead-out portion. At least part of the first electrode lead-out portion is disposed between the third electrode lead-out portion and the first housing wall, and the first electrode lead-out portion abuts against the third electrode lead-out portion.

[0044] In this way, the limiting effect on the first electrode lead-out portion can be directly achieved through the first housing wall and the third electrode lead-out portion, which is beneficial to simplify the related components for fixing the first electrode lead-out portion on the battery cell and reduce the number of components.

[0045] In some embodiments, the third electrode lead-out portion includes an electrode terminal and a first insulating member, the electrode terminal is fixed to the first insulating member, the first electrode lead-out portion is at least partially disposed between the first insulating member and the first shell wall, and the first insulating member abuts against the first electrode lead-out portion. In this way, the probability of direct electrical conduction between the third electrode lead-out portion and the first electrode lead-out portion is reduced by the first insulating member, and at the same time, the risk of short circuit caused by direct electrical conduction between the electrode terminal and the first shell wall is also reduced, thereby improving the safety of the battery; the first insulating member plays a role in positioning the first electrode lead-out portion.

[0046] In some embodiments, the battery cell further includes a second insulating member, which is at least partially located between the first electrode lead-out portion and the first housing wall. In this way, the risk of short circuit caused by direct electrical conduction between the first electrode lead-out portion and the first housing wall is reduced, thereby improving the safety of the battery.

[0047] In some embodiments, the first insulating member and the second insulating member are integrally formed, so that the first insulating member and the second insulating member can be formed in one piece, which is beneficial to improving production efficiency, simplifying the assembly process, and improving the production efficiency of the battery cell.

[0048] In some embodiments, the first electrode lead-out portion includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall away from the accommodation space, the electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall away from the accommodation space, and the first insulating member is fixed to the first terminal plate;

[0049] Along the wall thickness direction of the first shell wall, the first terminal plate, the first insulating member and the second terminal plate partially overlap, and the second terminal plate is partially arranged between the first insulating member and the first shell wall, and the first terminal plate abuts against the first insulating member. In this way, the abutting portion of the first electrode lead-out portion and the third electrode lead-out portion is located outside the accommodation space, reducing the probability of interference between the abutting position of the first electrode lead-out portion and the third electrode lead-out portion and the position where the electrode assembly is electrically connected to the first electrode lead-out portion and the third electrode lead-out portion.

[0050] In some embodiments, the first electrode lead-out portion further includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the electrode terminal further includes a second terminal plate, which is disposed on a side of the first housing wall facing the accommodation space;

[0051] Along the wall thickness direction of the first housing wall, the first terminal plate is at least partially disposed between the second terminal plate and the first housing wall; or, along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall. Thus, through the first terminal plate, the second terminal plate, and the first housing wall, it is possible to further limit the first electrode lead-out portion or the third electrode lead-out portion along the wall thickness direction of the first housing wall.

[0052] In some embodiments, the third electrode lead-out portion is provided with a first protrusion, and the first electrode lead-out portion is provided with a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other. Thus, along the wall thickness direction of the first housing wall, the purpose of abutting the first electrode lead-out portion and the third electrode lead-out portion is achieved between the first protrusion and the second protrusion.

[0053] In some embodiments, the first recess includes a first step portion and a second step portion, and the second step portion is disposed on a side of the first step portion away from the third electrode lead-out portion;

[0054] The first protrusion includes a first extending portion provided on the electrode terminal. Along the wall thickness direction of the first housing wall, a part of the first electrode lead-out portion is located between the first extending portion and the first housing wall, and the first extending portion is at least partially received in the step space formed by the first step portion;

[0055] The first protrusion further includes a first covering portion provided on the first insulating member. Along the wall thickness direction of the first housing wall, a part of the first electrode lead-out portion is located between the first covering portion and the first housing wall, and the first covering portion is at least partially received in the step space formed by the second step portion.

[0056] Thus, through the first step portion and the second step portion, it is beneficial to realize the limiting effect between the first electrode lead-out portion and the third electrode lead-out portion along the wall thickness direction of the first housing wall and perpendicular to the wall thickness direction of the first housing wall; it is beneficial to increase the creepage distance between the first electrode lead-out portion and the third electrode lead-out portion through the first covering portion, reduce the probability of short circuit between the first electrode lead-out portion and the third electrode lead-out portion due to foreign objects, and improve the use safety of the battery.

[0057] In some embodiments, along the wall thickness direction of the first housing wall, the height difference between the surface of the first terminal plate facing away from the first housing wall and the surface of the second terminal plate facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm. Thus, it is beneficial to reduce the probability that the first electrode lead-out portion and the second electrode lead-out portion interfere with other devices electrically connected to each other.

[0058] In some embodiments, the first terminal plate includes a first main body portion and a first extension portion connected to each other, and the second terminal plate includes a second main body portion and a second extension portion connected to each other. Along the length direction of the first housing wall, the first extension portion and the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged in length along the width direction of the first housing wall. In this way, through the first extension portion and the second extension portion, it is convenient to realize the electrical connection with the bus bar, which is beneficial to taking advantage of the characteristic that there is a large amount of space in the length direction of the first housing wall to increase the contact area between the first extension portion and the second extension portion and the bus bar respectively; the two are arranged along the width direction of the first housing wall, which is beneficial to making the arrangement of the first extension portion and the second extension portion more concentrated, and realizing the electrical connection with other devices in the battery such as the sampling component through the first main body portion and the second main body portion, reducing the probability of interference when the first terminal plate and the second terminal plate are respectively electrically connected to other devices.

[0059] In some embodiments, the first electrode lead-out portion further includes a first terminal disk, at least part of the first terminal disk is disposed on the side of the first housing wall facing the accommodation space, the electrode terminal further includes a second terminal disk, the second terminal disk is disposed on the side of the first housing wall facing the accommodation space, and the first main body portion and the first terminal disk are directly connected through a first connecting column;

[0060] The second main body portion and the second terminal disk are directly connected through a second connecting column. In this way, the electrical connection between the first terminal plate and the first terminal disk is realized, and the electrical connection between the second terminal plate and the second terminal disk is realized, which is beneficial to reducing the through holes on the housing for respectively passing through the first electrode lead-out portion and the third electrode lead-out portion.

[0061] In some embodiments, the first recessed portion is disposed on the side of the first extension portion facing the electrode terminal, and the first protruding portion is disposed on the side of the second main body portion facing the first electrode lead-out portion. In this way, through the second main body portion, the limiting and constraining effects on the first extension portion in the thickness direction of the first housing wall are realized, reducing the probability that the first extension portion warps and other problems affect its normal function.

[0062] In some embodiments, the electrode terminal is further provided with a second recessed portion, a part of the first electrode lead-out portion forms at least part of the second protruding portion, and the second protruding portion and the second recessed portion at least partially overlap along the wall thickness direction of the first housing wall, and the second protruding portion and the second recessed portion cooperate with each other;

[0063] The second recessed portion is provided on the side of the second extension portion facing the first electrode lead-out portion, and the second protruding portion is provided on the side of the first main body portion facing the electrode terminal. In this way, the probability that the second extension portion warps or the like and affects its normal function is reduced. On the basis of limiting the second extension portion, the purpose of mutual limitation between the first electrode lead-out portion and the third electrode lead-out portion is further achieved, which is more conducive to fixing their relative positions.

[0064] In some embodiments, the second recessed portion includes a third step portion and a fourth step portion, and the fourth step portion is provided on the side of the third step portion away from the first electrode lead-out portion;

[0065] The second protruding portion includes a second protruding portion provided on the first electrode lead-out portion. Along the wall thickness direction of the first housing wall, a part of the electrode terminal is located between the second protruding portion and the first housing wall, and the second protruding portion is at least partially received in the step space formed by the third step portion;

[0066] The battery cell further includes a second insulating member. The second insulating member is at least partially located between the first electrode lead-out portion and the first housing wall. The second protruding portion further includes a second covering portion provided on the second insulating member. Along the wall thickness direction of the first housing wall, a part of the electrode terminal is located between the second covering portion and the first housing wall, and the second covering portion is at least partially received in the step space formed by the fourth step portion.

[0067] In this way, through the third step portion and the fourth step portion, it is beneficial to realize the limiting effect between the first electrode lead-out portion and the third electrode lead-out portion along the wall thickness direction of the first housing wall and the direction perpendicular to the wall thickness direction of the first housing wall, which is further beneficial to improving the locking stability between the first electrode lead-out portion and the third electrode lead-out portion; it is beneficial to increase the creepage distance between the first electrode lead-out portion and the third electrode lead-out portion through the second covering portion, reduce the probability of short circuit between the first electrode lead-out portion and the third electrode lead-out portion caused by foreign objects, and improve the use safety of the battery.

[0068] In some embodiments, the second extension portion is connected to the second terminal plate through a third connecting column. The first recessed portion is provided on the side of the first extension portion facing the electrode terminal, and the first protruding portion is provided on the side of the second extension portion facing the first electrode lead-out portion. In this way, by fixing the second extension portion through the third connecting column, the purpose of suppressing the warping of the first extension portion is indirectly achieved.

[0069] In some embodiments, the bus bar is connected to the electrode lead-out portion along the second direction, the third direction is perpendicular to the first direction and the second direction pairwise, the electrode lead-out portion is located on the first wall surface of the battery cell, the first wall surface includes a first boundary and a second boundary opposed to each other along the third direction, and the minimum distance between the electrode lead-out portion and the first boundary is less than the minimum distance between the electrode lead-out portion and the second boundary. In this way, it is beneficial to make the range of the region where the first wall surface is located closer to the second boundary along the third direction of the electrode lead-out portion larger, facilitating the arrangement of other devices in the battery in this region.

[0070] In some embodiments, the bus bar is connected to the electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction pairwise;

[0071] All the electrode lead-out portions on the same battery cell are located on the same wall surface. On the same battery cell, the distance between the two farthest points of adjacent electrode lead-out portions along the third direction is less than or equal to one half of the maximum dimension of the wall surface along the third direction.

[0072] In this way, on one wall surface, the electrode lead-out portions are concentratedly arranged. Thus, through the mutual cooperation of the electrode lead-out portions, the strength of the stud configuration area in this wall surface and even the entire wall surface can be improved, which is beneficial to reducing the risk of deformation of the wall surface and enhancing the use safety of the battery cell. In addition, it is beneficial to make full use of other areas of this wall surface and other wall surfaces, and it is also beneficial to the centralized processing of the studs and other devices attached to the battery during processing and maintenance.

[0073] In some embodiments, the battery further includes a sampling component, the sampling component is electrically connected to the battery cell, and the sampling component is located on the same side of all the electrode lead-out portions along the third direction. In this way, it is beneficial for the sampling component to directly extend along the first direction and achieve electrical connection with each battery cell in the battery cell group, reducing the possibility of interference between the arrangement of the sampling component and the electrode lead-out portion.

[0074] In some embodiments, the sampling component and the electrode lead-out portion are both located on the first wall surface of the battery cell. In this way, it is convenient for the sampling component to achieve electrical connection with each electrode lead-out portion, which is beneficial to reducing the size required for the sampling component to achieve electrical connection with the electrode lead-out portion, and is beneficial to making the overall size of the battery more compact.

[0075] In some embodiments, the first wall surface includes a first boundary and a second boundary opposed to each other along the third direction, the minimum distance between the electrode lead-out portion and the first boundary is less than the minimum distance between the electrode lead-out portion and the second boundary, and at least a part of the sampling component is located between the electrode lead-out portion and the second boundary. In this way, a larger area for arranging the sampling component can be formed on the first wall surface, which is beneficial to improving the flexibility of the sampling component arrangement and reducing the probability of interference between the arrangement of the sampling component and the electrode lead-out portion.

[0076] In some embodiments, the battery further includes a sampling component. The bus bar is connected to the first electrode lead-out portion and the second electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction in pairs;

[0077] The first electrode lead-out portion includes a first connection portion and a second connection portion with different positions. The first connection portion is connected to the bus bar, and the second connection portion is connected to the sampling component. The minimum dimension of the first connection portion along the third direction is greater than the minimum dimension of the second connection portion along the third direction. In this way, when the dimension of the electrode lead-out portion along the third direction is fixed, the first connection portion has a larger dimension along the third direction than the second connection portion, which is beneficial to the bus bar having a larger dimension along the third direction, thereby helping to reduce the resistance of the bus bar and improve the current-carrying capacity of the bus bar. At the same time, a second connection portion dedicated to connecting with the sampling component is provided on the electrode lead-out portion, reducing the probability of interference between the bus bar and the sampling component.

[0078] In some embodiments, the second connection portion is located at one end of the first electrode lead-out portion along the third direction close to the sampling component for connecting to the sampling component, and the first connection portion is located at the other end of the first electrode lead-out portion. In this way, the second connection portion is closer to the sampling component in the third direction, which is beneficial to reducing the dimension required for the connection between the sampling component and the second connection portion, and further beneficial to reducing the probability that the information collected is affected by interference between the sampling component and other devices.

[0079] In some embodiments, the bus bars adjacent to each other along the first direction on the same battery cell group overlap in projection along the first direction. In this way, the arrangement of the bus bars in the battery can be made more concentrated, facilitating the protection of the electrical connection area in a centralized manner. And in some embodiments where the sampling component is connected to the bus bar, it is also beneficial to arrange the bus bars on the same battery cell group along the first direction, which helps to make the dimensions of the portions of the sampling component used to connect to the bus bars extend along the third direction to the respective bus bars approximately the same, and is beneficial to reducing the design and manufacturing costs of the sampling component.

[0080] In some embodiments, the battery includes a box body, which includes a receiving cavity and a first box wall. The first box wall is used to enclose the receiving cavity, and at least a part of the inner surface of the first box wall protrudes outward to form a recess on the inner surface.

[0081] At least a part of the electrode lead-out portion is received in the recess. In this way, the shape of the space in the receiving cavity can better adapt to the shape of the part of the battery cell other than the electrode lead-out portion, which is beneficial to improving the space utilization rate in the box body. In the same embodiment or some other embodiments, at least a part of the bus bar is received in the recess. In this way, the occupation of the space in the receiving cavity for arranging the battery cells by the bus bar is reduced, which is beneficial to improving the space utilization rate.

[0082] An embodiment of the present utility model further provides an electrical device, which includes the battery according to any one of the foregoing embodiments, and the battery is used to provide electrical energy for the electrical device. In this way, through the more compact and centralized arrangement of the electrode lead-out parts, it is beneficial to make the size of the battery more compact, and further beneficial to make the size of the electrical device more compact.

[0083] An embodiment of the present utility model further provides a vehicle, which includes a vehicle frame and the battery according to any one of the foregoing embodiments. The battery is installed on the vehicle frame, and a convex part is formed on the outer surface of the first box wall in the wall thickness direction corresponding to the area of the concave part, and the convex part faces the vehicle frame. In this way, the convex part being located in the vehicle frame is beneficial to improving the space utilization rate inside the vehicle and beneficial to increasing the battery capacity that the vehicle can carry.

[0084] In some embodiments, there is a support beam on the vehicle frame, the support beam has a slot, and at least a part of the convex part extends into the slot. In this way, the convex part can utilize the internal space of the support beam to improve the space utilization rate inside the vehicle, and the support beam can also transfer the load to the battery to improve the structural stiffness of the whole vehicle.

[0085] An embodiment of the present utility model further provides a battery cell, which is used for a battery. The battery cells are configured in the battery as multiple ones and arranged in a first direction. The battery further includes a busbar. The battery cell includes multiple electrode lead-out parts, and the battery cell is configured to connect the busbar to the electrode lead-out parts of the battery cells arranged adjacent to each other in the first direction; in a projection plane perpendicular to the first direction, the projections of at least two electrode lead-out parts located on the battery cell at least partially overlap.

[0086] The structure of the battery cell in this embodiment is beneficial to making the arrangement positions of the electrode lead-out parts on the same battery cell more concentrated and compact, so that when the battery cell is applied to the battery, a more regular space can be formed to reserve a more regular space for arranging other devices such as busbars and sampling components in the battery, which is beneficial to improving the space utilization rate inside the battery, facilitating the neat arrangement of various devices inside the battery, beneficial to improving the production and assembly efficiency of the battery. In addition, the arrangement of the busbars in the battery can also be more concentrated, which is convenient for centralized protection of the connection areas of the busbars.

[0087] In some embodiments, the battery cell includes a first electrode lead-out portion. The first electrode lead-out portion includes a first connection portion for connecting to a bus bar. The battery cell further includes a first edge and a second edge opposed to each other along a first direction. The maximum distance between the first connection portion and the first edge is less than the maximum distance between the first connection portion and the second edge. In this way, when such a battery cell is applied to a battery, it is beneficial to make the first connection portion closer to the electrode lead-out portion of another battery cell in the battery along the first direction, which is beneficial to further shorten the size required for the bus bar to electrically connect the first electrode lead-out portion and the second electrode lead-out portion, and thus is beneficial to further reduce the resistance of the bus bar.

[0088] In some embodiments, the battery cell further includes a third electrode lead-out portion. In a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction at least partially overlap. The first electrode lead-out portion and the third electrode lead-out portion are an asymmetric structure with respect to the center of the wall surface where they are located. In this way, the first electrode lead-out portion and the third electrode lead-out portion can be an asymmetric structure on the wall surface where they are located, and do not need to be a symmetric structure. The position setting of the electrode lead-out portion can be more flexible. For example, multiple electrode lead-out portions on the same battery cell can be biased to one side to form a larger area of free space on this wall surface for arranging other components in the battery.

[0089] In some embodiments, in a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction are at least partially misaligned. In this way, the creepage distance between the two misaligned portions of the projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction is increased. When such a battery cell is used in a battery, it is beneficial to electrically connect electrical connection components with a large creepage distance requirement in the battery, such as different sampling terminals of a sampling assembly, different-pole tabs, etc., to the misaligned portion of the first electrode lead-out portion and the misaligned portion of the third electrode lead-out portion respectively, so as to improve the safety of battery use.

[0090] In some embodiments, the bus bar is used to be connected to the first electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction pairwise; the first electrode lead-out portion has a first end portion in the third direction. In the projection plane perpendicular to the first direction, the projection of the first end portion along the first direction is misaligned with the projection of the third electrode lead-out portion along the first direction. The third electrode lead-out portion has a second end portion in the third direction. In the projection plane perpendicular to the first direction, the projection of the second end portion along the first direction is misaligned with the projection of the first electrode lead-out portion along the first direction; the battery cell further includes a housing, a first internal connection member, and a second internal connection member. The first internal connection member is located inside the housing and connected to the first end portion, and the second internal connection member is located inside the housing and connected to the second end portion. In this way, it is beneficial to increase the creepage distance between the first internal connection member and the second internal connection member in the battery cell, reduce the short-circuit risk between the two, and improve the use safety of the battery.

[0091] In some embodiments, the first end portion protrudes along the first direction towards the third electrode lead-out portion. In the same embodiment or different embodiments, the second end portion protrudes along the first direction towards the first electrode lead-out portion. In this way, it is beneficial to increase the size of the first end portion when the sizes of the first electrode lead-out portion and the third electrode lead-out portion along the first direction are fixed, beneficial to increase the size of the connection area between the first end portion and the first internal connection member, improve the current-carrying capacity, and beneficial to make the arrangement of the first electrode lead-out portion and the third electrode lead-out portion more compact; at the same time, it is beneficial to increase the total outer surface area of the first electrode lead-out portion and the third electrode lead-out portion, beneficial to improve the heat generation situation of the first electrode lead-out portion and the third electrode lead-out portion during the current passing process, and enhance the use safety of the battery.

[0092] In some embodiments, the battery cell further includes a housing and an electrode assembly. The housing has an accommodation space, and the housing includes a first housing wall. At least part of the electrode assembly is disposed in the accommodation space; the electrode lead-out portion is disposed on the first housing wall, and the electrode lead-out portion includes a first electrode lead-out portion and a third electrode lead-out portion. At least part of the first electrode lead-out portion is disposed between the third electrode lead-out portion and the first housing wall, and the first electrode lead-out portion abuts against the third electrode lead-out portion. In this way, the first housing wall and the third electrode lead-out portion can directly achieve the limiting effect on the first electrode lead-out portion, which is beneficial to simplify the related components for fixing the first electrode lead-out portion on the battery cell and reduce the number of components.

[0093] In some embodiments, the third electrode lead-out portion includes an electrode terminal and a first insulating member, the electrode terminal is fixed to the first insulating member, the first electrode lead-out portion is at least partially disposed between the first insulating member and the first shell wall, and the first insulating member abuts against the first electrode lead-out portion. In this way, the probability of direct electrical conduction between the third electrode lead-out portion and the first electrode lead-out portion is reduced by the first insulating member, and at the same time, the risk of short circuit caused by direct electrical conduction between the electrode terminal and the first shell wall is also reduced, thereby improving the safety of the battery; the first insulating member plays a role in positioning the first electrode lead-out portion.

[0094] In some embodiments, the battery cell further includes a second insulating member, which is at least partially located between the first electrode lead-out portion and the first housing wall. In this way, the risk of short circuit caused by direct electrical conduction between the first electrode lead-out portion and the first housing wall is reduced, thereby improving the safety of the battery.

[0095] In some embodiments, the first insulating member and the second insulating member are integrally formed, so that the first insulating member and the second insulating member can be formed in one piece, which is beneficial to improving production efficiency, simplifying the assembly process, and improving the production efficiency of the battery cell.

[0096] In some embodiments, the first electrode lead-out portion includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall away from the accommodation space, the electrode terminal includes a second terminal plate, the second terminal plate is disposed on a side of the first housing wall away from the accommodation space, and the first insulating member is fixed to the first terminal plate;

[0097] Along the wall thickness direction of the first shell wall, the first terminal plate, the first insulating member and the second terminal plate partially overlap, and the second terminal plate is partially arranged between the first insulating member and the first shell wall, and the first terminal plate abuts against the first insulating member. In this way, the abutting portion of the first electrode lead-out portion and the third electrode lead-out portion is located outside the accommodation space, reducing the probability of interference between the abutting position of the first electrode lead-out portion and the third electrode lead-out portion and the position where the electrode assembly is electrically connected to the first electrode lead-out portion and the third electrode lead-out portion.

[0098] In some embodiments, the first electrode lead-out portion further includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the electrode terminal further includes a second terminal plate, which is disposed on a side of the first housing wall facing the accommodation space;

[0099] Along the wall thickness direction of the first housing wall, the first terminal plate is at least partially disposed between the second terminal plate and the first housing wall; or, along the wall thickness direction of the first housing wall, the second terminal plate is at least partially disposed between the first terminal plate and the first housing wall. Thus, through the first terminal plate, the second terminal plate, and the first housing wall, the first electrode lead-out portion or the third electrode lead-out portion can be further limited along the wall thickness direction of the first housing wall.

[0100] In some embodiments, the third electrode lead-out portion is provided with a first protrusion, and the first electrode lead-out portion is provided with a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first housing wall, and the first protrusion and the first recess cooperate with each other. Thus, along the wall thickness direction of the first housing wall, the purpose of abutting the first electrode lead-out portion and the third electrode lead-out portion is achieved between the first protrusion and the second protrusion.

[0101] In some embodiments, the first recess includes a first step portion and a second step portion, and the second step portion is disposed on a side of the first step portion away from the third electrode lead-out portion;

[0102] The first protrusion includes a first extension portion provided on the electrode terminal. Along the wall thickness direction of the first housing wall, a part of the first electrode lead-out portion is located between the first extension portion and the first housing wall, and the first extension portion is at least partially received in the step space formed by the first step portion;

[0103] The first protrusion further includes a first covering portion provided on the first insulating member. Along the wall thickness direction of the first housing wall, a part of the first electrode lead-out portion is located between the first covering portion and the first housing wall, and the first covering portion is at least partially received in the step space formed by the second step portion.

[0104] Thus, through the first step portion and the second step portion, it is beneficial to realize the limiting effect between the first electrode lead-out portion and the third electrode lead-out portion along the wall thickness direction of the first housing wall and perpendicular to the wall thickness direction of the first housing wall; it is beneficial to increase the creepage distance between the first electrode lead-out portion and the third electrode lead-out portion through the first covering portion, reduce the probability of short circuit between the first electrode lead-out portion and the third electrode lead-out portion due to foreign objects, and improve the use safety of the battery.

[0105] In some embodiments, along the wall thickness direction of the first housing wall, the height difference between the surface of the first terminal plate facing away from the housing wall and the surface of the second terminal plate facing away from the first housing wall is greater than or equal to 0 and does not exceed 0.5 mm. Thus, it is beneficial to reduce the probability that the first electrode lead-out portion and the second electrode lead-out portion interfere with other devices electrically connected to each other.

[0106] In some embodiments, the first terminal plate includes a first main body portion and a first extension portion connected to each other. The second terminal plate includes a second main body portion and a second extension portion connected to each other. Along the length direction of the first housing wall, the first extension portion and the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged in length along the width direction of the first housing wall. In this way, through the first extension portion and the second extension portion, it is convenient to realize the electrical connection with the bus bar, which is beneficial to utilize the characteristic that there is a large amount of space in the length direction of the first housing wall to increase the contact area between the first extension portion and the second extension portion and the bus bar respectively. The two are arranged along the width direction of the first housing wall, which is beneficial to make the arrangement of the first extension portion and the second extension portion more concentrated, and realize the electrical connection with other devices in the battery such as the sampling component through the first main body portion and the second main body portion, reducing the probability of interference when the first terminal plate and the second terminal plate are respectively electrically connected to other devices.

[0107] In some embodiments, the electrode terminal further includes a first terminal disk, at least a part of the first terminal disk is disposed on the side of the first housing wall facing the accommodation space. The electrode terminal further includes a second terminal disk, the second terminal disk is disposed on the side of the first housing wall facing the accommodation space. The first main body portion and the first terminal disk are directly connected through a first connecting column; the second main body portion and the second terminal disk are directly connected through a second connecting column; in the second terminal plate, the second connecting column is disposed on the second main body portion. In this way, the electrical connection between the first terminal plate and the first terminal disk is realized, and the electrical connection between the second terminal plate and the second terminal disk is realized, which is beneficial to reducing the through holes on the housing for respectively passing through the first electrode lead-out portion and the third electrode lead-out portion.

[0108] In some embodiments, a first recessed portion is disposed on the side of the first extension portion facing the electrode terminal, and a first protruding portion is disposed on the side of the second main body portion facing the first electrode lead-out portion. In this way, through the second main body portion, the limiting and constraining effects on the first extension portion in the thickness direction of the first housing wall are realized, reducing the probability that the first extension portion warps or the like and affects its normal function.

[0109] In some embodiments, the electrode terminal is further provided with a second recessed portion, a part of the first electrode lead-out portion forms at least a part of the second protruding portion, and the second protruding portion and the second recessed portion at least partially overlap along the wall thickness direction of the first housing wall, and the second protruding portion and the second recessed portion cooperate with each other;

[0110] The second recessed portion is provided on the side of the second extending portion facing the first electrode lead-out portion, and the second protruding portion is provided on the side of the first main body portion facing the electrode terminal. In this way, the probability of problems such as warping of the second extending portion affecting its normal function is reduced. On the basis of limiting the second extending portion, the purpose of mutual limitation between the first electrode lead-out portion and the third electrode lead-out portion is further achieved, which is more conducive to fixing their relative positions.

[0111] In some embodiments, the second recessed portion includes a third stepped portion and a fourth stepped portion, and the fourth stepped portion is provided on the side of the third stepped portion away from the first electrode lead-out portion;

[0112] The second protruding portion includes a second protruding portion provided on the first electrode lead-out portion. Along the wall thickness direction of the first housing wall, a part of the electrode terminal is located between the second protruding portion and the first housing wall, and the second protruding portion is at least partially received in the stepped space formed by the third stepped portion;

[0113] The battery cell further includes a second insulating member. The second insulating member is at least partially located between the first electrode lead-out portion and the first housing wall. The second protruding portion further includes a second covering portion provided on the second insulating member. Along the wall thickness direction of the first housing wall, a part of the electrode terminal is located between the second covering portion and the first housing wall, and the second covering portion is at least partially received in the stepped space formed by the fourth stepped portion.

[0114] The third stepped portion and the fourth stepped portion are conducive to realizing the limiting effect between the first electrode lead-out portion and the third electrode lead-out portion along the wall thickness direction of the first housing wall and the direction perpendicular to the wall thickness direction of the first housing wall, which is further conducive to improving the locking stability between the first electrode lead-out portion and the third electrode lead-out portion; it is conducive to increasing the creepage distance between the first electrode lead-out portion and the third electrode lead-out portion through the second covering portion, reducing the probability of short circuit between the first electrode lead-out portion and the third electrode lead-out portion caused by foreign objects, and improving the use safety of the battery.

[0115] In some embodiments, the second extending portion is connected to the second terminal plate through a third connecting column. The first recessed portion is provided on the side of the first extending portion facing the electrode terminal, and the first protruding portion is provided on the side of the second extending portion facing the first electrode lead-out portion. In this way, the purpose of suppressing the warping of the first extending portion is indirectly achieved through the fixation of the second extending portion by the third connecting column.

[0116] In some embodiments, the bus bar is configured to be connected to the electrode lead-out portion along a second direction, and a third direction is perpendicular to the first direction and the second direction pairwise; the electrode lead-out portion is located on a first wall surface of the battery cell, and the first wall surface includes a first boundary and a second boundary that face each other along the third direction, and the minimum distance between the electrode lead-out portion and the first boundary is less than the minimum distance between the electrode lead-out portion and the second boundary. Thus, when such a battery cell is applied to a battery, it is beneficial to make the range of the area where the first wall surface is located closer to the second boundary along the third direction of the electrode lead-out portion larger, facilitating the arrangement of other components in the battery in this area.

[0117] In some embodiments, the bus bar is connected to the electrode lead-out portion along the second direction, and the third direction is perpendicular to the first direction and the second direction pairwise; all the electrode lead-out portions on the same battery cell are located on the same wall surface. On the same battery cell, the distance between the two farthest points along the third direction of two adjacent electrode lead-out portions is less than or equal to one-half of the maximum dimension of the wall surface along the third direction. Thus, on one wall surface, the electrode lead-out portions are concentratedly arranged. Therefore, through the mutual cooperation of the electrode lead-out portions, the strength of the stud configuration area in this wall surface and even the entire wall surface can be improved, which is beneficial to reducing the risk of deformation of the wall surface and enhancing the use safety of the battery cell. In addition, it is beneficial to make full use of other areas of this wall surface and other wall surfaces, and it is also beneficial to the centralized processing of the studs and other components attached to the battery during processing and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0118] Figure 1 Schematic diagram of an electrical device being a vehicle in an embodiment of the present utility model;

[0119] Figure 2 Schematic diagram of a battery in an embodiment of the present utility model;

[0120] Figure 3 Schematic diagram of a battery cell group and a bus bar in the first embodiment of the present utility model;

[0121] Figure 4 Schematic diagram of a battery cell group and a bus bar in the second embodiment of the present utility model;

[0122] Figure 5 Schematic diagram of a battery cell group and a bus bar in the third embodiment of the present utility model;

[0123] Figure 6 is Figure 3 Partial enlarged schematic diagram of position A1 in

[0124] Figure 7 is Figure 4 Partial enlarged schematic diagram of position A2 in

[0125] Figure 8 is Figure 5 a partial enlarged schematic view of position A3 in

[0126] Fig. 9 is Figure 5 a partial enlarged schematic view of position A3 in

[0127] Fig.10 is Figure 5 a partial enlarged schematic view of position A3 in

[0128] Fig.11 an isometric schematic view of a battery cell group;

[0129] Fig.12 is Figure 5 a partial enlarged schematic view of position A3 in

[0130] Fig.13 is Figure 5 a partial enlarged schematic view of position A3 in

[0131] Fig.14 is Figure 5 a partial enlarged schematic view of position A3 in

[0132] Fig.15 In one embodiment of the bus bar of the present utility model, in Fig.14 a sectional view at position B - B in

[0133] Fig.16 is Fig.14 a sectional view at position C - C of the embodiment in

[0134] Fig.17 In another embodiment of the bus bar of the present utility model, in Fig.14 a sectional view at position B - B in

[0135] Fig.18 is Fig.17 a sectional view at position C - C of the embodiment in Fig.14 in

[0136] Fig.19 an isometric schematic view of the bus bar in one embodiment of the present utility model;

[0137] Fig. 20 a schematic view of a battery cell group, a bus bar, and a sampling component in the fourth embodiment of the present utility model;

[0138] Fig.21 Schematic diagram of the battery cell group and the bus bar in the fifth embodiment of the present utility model;

[0139] Fig. 22 Schematic diagram of the battery cell group and the bus bar in the sixth embodiment of the present utility model;

[0140] Fig.23 is Figure 4 Partial enlarged schematic diagram of the position A2 in [], and the first end 2312 and the second end 2331 are marked;

[0141] Fig.24 is Figure 5 Partial enlarged schematic diagram of the position A3 in [], and the first end 2312 and the second end 2331 are marked;

[0142] Fig.25 is Fig.21 Cross-sectional schematic diagram of the battery cell in the embodiment of [];

[0143] Fig.26 is Fig.25 Partial enlarged schematic diagram of the position D in [];

[0144] Fig. 27 Schematic diagram of the first housing wall, the first electrode lead-out part and the third electrode lead-out part in an embodiment of the present utility model;

[0145] Fig.28 is Fig. 27 Cross-sectional schematic diagram at the E-E position in [];

[0146] Fig.29 is Fig.28 Partial enlarged schematic diagram of the position G in [];

[0147] Fig.30 is Fig. 27 Cross-sectional schematic diagram at the F-F position in [];

[0148] Fig.31 is Fig.30 Partial enlarged schematic diagram of the position H in [];

[0149] Fig.32 Schematic diagram of the first housing wall, the first electrode lead-out part and the third electrode lead-out part in another embodiment of the present utility model;

[0150] Fig.33 Schematic diagram of the battery cell in an embodiment of the present utility model;

[0151] Fig.34 Schematic diagram of the battery cell group, the bus bar and the sampling component in an embodiment of the present utility model;

[0152] Fig.35 is Fig.34 a partially enlarged schematic view of position I in [description];

[0153] Fig.36 is a schematic view of a battery in an embodiment of the present utility model;

[0154] Fig.37 is Fig.36 a schematic view of the embodiment in another perspective, wherein partial positions of the box body are shown in section;

[0155] Fig.38 is Fig.37 a partially enlarged schematic view of position J in [description];

[0156] Fig.39 is a partially sectional schematic view of a battery in an embodiment of the present utility model;

[0157] Fig.40 is a schematic view of the arrangement of a frame and a battery in an embodiment of the present utility model;

[0158] Fig.41 is Fig.40 a partially enlarged schematic view of position M in [description].

[0159] Description of reference numerals

[0160] 1000, Vehicle; 100, Battery; 200, Controller; 300, Motor; 400, Frame; 400a, Accommodation Chamber; 401, Support Beam; 401a, Groove; 10, Battery Cell Group; 20, Battery Cell; 21, First Battery Cell; 21a, First Edge; 21b, Second Edge; 21c, First Wall Surface; 21d, First Boundary; 21e, Second Boundary; 22, Second Battery Cell; 22a, Third Edge; 22b, Fourth Edge; 22c, Second Wall Surface; 23, Electrode Lead-out Port; 231, First Electrode Lead-out Port; 231a, First Depression; 231b, First Step; 231c, Second Step; 231d, Second Protrusion; 231e, Second Extension; 2311, First Connection Port; 2312, First End; 2313, Second Connection Port; 2314, First Terminal Plate; 2314a, First Main Body; 2314b, First Extension; 2315, First Terminal Disk; 2316, First Connection Post; 232, Second Electrode Lead-out Port; 2321, Third Connection Port; 233, Third Electrode Lead-out Port; 233a, First Protrusion; 2331, Second End; 2332, Electrode Terminal; 2332a, Second Terminal Plate; 2332b, Second Terminal Disk; 2332c, First Extension; 2332d, Second Depression; 2332e, Second Main Body; 2332f, Second Extension; 2332g, Second Connection Post; 2332h, Third Step; 2332i, Third Connection Post; 2332j, Fourth Step; 2333, First Insulating Part; 2333a, First Covering Part; 234, Fourth Electrode Lead-out Port; 24, Housing; 24a, Accommodation Space; 241, First Housing Wall; 25, First Inner Connector; 26, Second Inner Connector; 27, Electrode Assembly; 28, Second Insulating Part; 28a, Second Covering Part; 30, Busbar; 31, Busbar Strip; 31a, Second Sub-busbar Strip; 31b, First Sub-busbar Strip; 40, Sampling Assembly; 50, Box; 50a, Accommodation Cavity; 51, First Box Wall; 511, Recess; 512, Protrusion; 53, Top Cover; 54, Bottom Cover. Detailed Embodiment

[0161] It should be noted that, without conflict, the embodiments and technical features in the embodiments of the present utility model can be combined with each other. The detailed description in the specific implementation manners should be understood as an explanatory illustration of the gist of the present utility model and should not be regarded as an improper limitation of the present utility model.

[0162] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model; the terms "including" and "having" and any variations thereof in the description of the specification and the above-mentioned drawings are intended to cover non-exclusive inclusion.

[0163] In the description of the embodiments of this utility model, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0164] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this utility model. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0165] In the description of the embodiments of this utility model, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0166] In the description of the embodiments of this utility model, for ease of explanation, as Figures 3 to 14 、 Figure 20 to Figure 25 、 Fig.28 、 Fig.34 、 Fig.35 and Fig.38 shown, the direction in which the arrow F1 is located is the "first direction"; as Fig.11 、 Figures 15 to 19 、 Fig.25 、 Fig.28 、 Fig.37 、 Fig.40 shown, the direction in which the arrow F2 is located is the "second direction"; as Figures 3 to 13 、 Fig.19 、 Fig.23 、 Fig.24 、 Fig. 27 、 Fig.33 、 Fig.34 and Fig.37 shown, the direction in which the arrow F3 is located is the "third direction".

[0167] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0168] In the description of the embodiments of the present utility model, unless otherwise clearly stipulated and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0169] At present, batteries are increasingly used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0170] Figure 2 The following is a schematic diagram of a three-dimensional exploded view of a battery 100 provided in an embodiment of the present utility model. Figure 2 As shown, the battery 100 includes a case 50 and at least one battery cell 10 .

[0171] The box body 50 includes a top cover 53 and a bottom cover 54 . The top cover 53 is covered on the bottom cover 54 , so that an installation space for placing the battery cell 10 is formed between the bottom cover 54 and the top cover 53 .

[0172] In the battery 100, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is placed in the accommodation space formed by the bottom cover 54 and the top cover 53; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the bottom cover 54 and the top cover 53. The battery 100 may also include other structures. For example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 10.

[0173] In the embodiments of the present utility model, the battery cell 10 involved may include an electrode assembly and an electrolyte. The electrode assembly may be composed of a positive electrode sheet, a negative electrode sheet, and a separator. Such a battery cell 10 may operate by relying on the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the coated positive electrode active material layer protrudes from the current collector with the coated positive electrode active material layer. The stacked current collectors without the coated positive electrode active material layer serve as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the coated negative electrode active material layer protrudes from the current collector with the coated negative electrode active material layer. The stacked current collectors without the coated negative electrode active material layer serve as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a stacked structure. In addition, the battery cell 10 involved in the embodiments of the present utility model may also be a solid-state battery cell.

[0174] The battery cell 10 may be a secondary battery, which refers to a battery cell 10 that can be activated by charging after discharging to continue to be used.

[0175] The battery cell 10 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present utility model do not limit this.

[0176] The battery cell 10 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. The embodiments of the present utility model have no special limitations.

[0177] The battery 100 involved in the embodiments of the present utility model refers to a single physical module including one or more battery cells 10 to provide a higher voltage and capacity.

[0178] In the embodiments of the present utility model, the electrical device involved is powered by the above-mentioned battery. The electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0179] In the following embodiments, for the convenience of description, the electrical device of an embodiment of the present utility model is taken as an example of a vehicle 1000 for illustration. The following is described with reference to the accompanying drawings.

[0180] Figure 1 FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by an embodiment of the present utility model. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. As Figure 1 shown, a battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0181] In some embodiments of the present utility model, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0182] Next, the embodiments of the present utility model will be described in detail.

[0183] In a battery, the electrode lead-out portion of a battery cell is usually set to protrude from the housing of the battery cell and has a certain height. This makes it necessary to plan a part of the space inside the battery to accommodate the electrode lead-out portion. For the convenience of production, the electrode lead-out portions of different polarities on the same battery cell are usually symmetrically disposed at both ends of the battery cell along its length direction. This makes it difficult to utilize the remaining space on the wall surface of the battery cell where the electrode lead-out portion is provided to arrange other components inside the battery. For example, when arranging between two electrode lead-out portions with different polarities, it is also necessary to consider the interference problem and insulation problem with the electrode lead-out portions on both sides, resulting in a great waste of space.

[0184] Moreover, the electrode lead-out portions of different polarities will be arranged in a relatively scattered manner, which is not conducive to the compact arrangement of other components in the battery, such as the current collector, with the electrode lead-out portions, and is not conducive to improving the space utilization rate.

[0185] Based on the above problems, an embodiment of the present invention provides a battery. The battery includes a battery cell group and a current collector. The battery cell group includes a plurality of electrode lead-out portions. The current collector is connected to the electrode lead-out portions of adjacent battery cells arranged in a first direction; in a projection plane perpendicular to the first direction, the projections of at least two electrode lead-out portions on the same battery cell at least partially overlap. In this way, it is beneficial to make the arrangement positions of the electrode lead-out portions on the same battery cell more concentrated and compact, which is conducive to more compactly arranging other components in the battery and the battery cell, thereby improving the space utilization rate within the battery.

[0186] Specifically, referring to Figures 3 to 5 , and referring to a battery 100 provided by an embodiment of the present invention together, the battery 100 includes:

[0187] A battery cell group 10, including a plurality of battery cells 20 arranged in a first direction F1. The battery cells 20 include a plurality of electrode lead-out portions 23; a current collector 30, which is connected to the electrode lead-out portions 23 of adjacent battery cells 20 arranged in the first direction F1; in a projection plane perpendicular to the first direction F1, the projections of at least two electrode lead-out portions 23 on the same battery cell 20 at least partially overlap.

[0188] The battery cell group 10 refers to a combination formed by a plurality of battery cells 20 arranged in the first direction F1.

[0189] The electrode lead-out portion 23, referring to Fig.26 and Fig. 27 , can penetrate through the housing 24 of the battery cell 20. A part of the electrode lead-out portion 23 can be located inside the housing 24 to be electrically connected to the electrode assembly 27 inside the housing 24; another part can be located outside the housing 24 for electrically connecting other components in the battery 100, such as the current collector 30 and the sampling assembly 40.

[0190] The current collector 30 has conductivity, and different electrode lead-out portions 23 on different battery cells 20 achieve series and parallel electrical connections between different battery cells 20.

[0191] It can be understood that the polarity of the electrode lead-out portion 23 can be negative or positive.

[0192] In a projection plane perpendicular to the first direction F1, the projections of at least two electrode lead-out portions 23 on the same battery cell 20 at least partially overlap. That is, on one battery cell 20, there are at least two electrode lead-out portions 23, and a part of each of them is disposed opposite to each other along the first direction F1.

[0193] In the battery 100 according to the embodiment of the present invention, through the electrode lead-out portions 23 of the same battery cell 20, at least partial overlap is achieved in the projection along the first direction F1 on the projection plane perpendicular to the first direction F1, which is beneficial to making the arrangement positions of the electrode lead-out portions 23 on the battery cell 20 more concentrated and compact. Thus, when the battery cells 20 are arranged in groups and applied to the battery 100, a relatively regular space can be formed in the battery 100 for arranging other components such as the bus bar 30 and the sampling assembly 40 in the battery 100, which is beneficial to improving the space utilization rate in the battery 100, facilitating the neat arrangement of various components in the battery 100, and beneficial to improving the production and assembly efficiency of the battery 100.

[0194] In some embodiments where the battery cell 20 is a square shell battery cell, the first direction F1 may be the width direction of the battery cell 20, the second direction may be the height direction F2 of the battery cell 20, and the third direction F3 may be the length direction of the battery cell 20.

[0195] In some embodiments, in the projection plane perpendicular to the first direction F1, the projections of the electrode lead-out portions 23 on two adjacent battery cells 20 along the first direction F1 at least partially overlap. That is to say, in two adjacent battery cells 20, an electrode lead-out portion 23 on one battery cell 20 and an electrode lead-out portion 23 on the other battery cell 20, a part of each of them is disposed opposite to each other along the first direction F1. This can make the arrangement positions of all the electrode lead-out portions 23 in the same battery cell group 10 more concentrated and compact, thus being beneficial to forming a relatively regular space in the battery 100 to reserve a more regular space for arranging other components such as the bus bar and the sampling assembly in the battery 100, beneficial to improving the space utilization rate in the battery 100, facilitating the neat arrangement of various components in the battery 100, and beneficial to improving the production and assembly efficiency of the battery 100.

[0196] In some embodiments, refer to Figures 3 to 5, the battery cell group 10 includes a first battery cell 21 and a second battery cell 22 adjacent to each other along the first direction F1. The electrode lead-out portion 23 includes a first electrode lead-out portion 231 located on the first battery cell 21 and a second electrode lead-out portion 232 located on the second battery cell 22; in the projection plane perpendicular to the first direction F1, the projections of the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the first direction F1 overlap at least partially with each other, and the bus bar 30 extends along the first direction F1 to connect the overlapping portions of the projections of the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the first direction.

[0197] The first battery cell 21 and the second battery cell 22 refer to two battery cells 20 adjacent to each other along the first direction F1 in the battery cell group 10.

[0198] The first electrode lead-out portion 231 and the second electrode lead-out portion 232 refer to an electrode lead-out portion 23 located on the first battery cell 21 and an electrode lead-out portion 23 located on the second battery cell 22, respectively. When the first battery cell 21 and the second battery cell 22 are connected in series, the first electrode lead-out portion 231 and the second electrode lead-out portion 232 can have different polarities; when the first battery cell 21 and the second battery cell 22 are connected in parallel, the first electrode lead-out portion 231 and the second electrode lead-out portion 232 can have the same polarity.

[0199] A conductive path is formed between the first electrode lead-out portion 231 and the second electrode lead-out portion 232 through the bus bar 30, so that an electrical connection is achieved between the first battery cell 21 and the second battery cell 22.

[0200] In the projection plane perpendicular to the first direction F1, the projection of the first electrode lead-out portion 231 and the projection of the second electrode lead-out portion 232 overlap at least partially, that is to say, at least a part of the first electrode lead-out portion 231 is arranged opposite to the second electrode lead-out portion 232 along the first direction F1, and the bus bar 30 can connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the first direction F1, so that at least a part of the extending direction of the bus bar 30 can be the same as the arrangement direction of each battery cell 20 in the battery cell group 10.

[0201] It can be understood that according to the formula:

[0202] R = ρ * L / S

[0203] In the formula, R is the resistance value; ρ is the resistivity, which is determined by the material of the current collector 30 itself; L is the length of the current collector 30 in the extending direction; S is the current-carrying cross-sectional area of the current collector 30 perpendicular to its extending direction. When the resistivity and the current-carrying cross-sectional area are constant, the smaller the length of the current collector 30 in its extending direction, the smaller the resistance. In the case where the battery cells 20 are arranged in the first direction F1, at least partial overlap of the first electrode lead-out portion 231 and the second electrode lead-out portion 232 in the first direction F1 is beneficial to shortening the distance between the first electrode lead-out portion 231 and the second electrode lead-out portion 232, and further shortening the probability of the extending direction of the current collector 30 electrically connecting the two.

[0204] It can be understood that in the state where the battery cells 20 in the battery cell group 10 are arranged in the first direction F1, the distance between the overlapping portions of the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the first direction F1 is the shortest.

[0205] Thus, by making the first electrode lead-out portion 231 and the second electrode lead-out portion 232 at least partially overlap in the first direction F1, the arrangement of the electrode lead-out portions 23 on adjacent battery cells 20 can be relatively concentrated, facilitating electrical connection; and it is also beneficial to shortening the distance between the first electrode lead-out portion 231 and the second electrode lead-out portion 232 that the current collector 30 needs to electrically connect, thereby reducing the size of the current collector 30, which is beneficial to reducing the resistance of the current collector 30 and improving the current-carrying capacity of the current collector 30.

[0206] It should be noted that the first battery cell 21 and the second battery cell 22 are used to distinguish two adjacent battery cells 20 along the first direction F1, and these two battery cells 20 can be battery cells 20 with the same design specifications or different design specifications.

[0207] In some embodiments, referring to Figures 3 to 5 , the current collector 30 extends along the first direction F1 to electrically connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232.

[0208] That is to say, the extending direction of the current collector 30 is the same as the arrangement direction of each battery cell 20.

[0209] Thus, it is beneficial to further shorten the size required for the current collector 30 to electrically connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232, thereby further reducing the resistance of the current collector 30.

[0210] In some embodiments, referring to Figure 6 and Figure 7 , Figure 6 is Figure 3 the partial enlarged view at A1 in Figure 7 is Figure 4 Partial enlarged view at A2 in the figure. The first battery cell 21 includes a first edge 21a and a second edge 21b that face each other along the first direction F1. The first edge 21a is closer to the second battery cell 22 than the second edge 21b. The maximum distance between the first electrode lead-out portion 231 and the first edge 21a is less than the maximum distance between the first electrode lead-out portion 231 and the second edge 21b. That is to say, the minimum distance between the first electrode lead-out portion 231 and the first edge 21a is S1, and the minimum distance between the first electrode lead-out portion 231 and the second edge 21b is S2, and S1 < S2.

[0211] The first edge 21a and the second edge 21b are two edges at opposite ends of the outer contour of the first battery cell 20 along the first direction F1. Among them, the first edge 21a is located on the side of the second edge 21b closer to the second battery cell 20 along the first direction F1.

[0212] In this way, it is beneficial to make the first electrode lead-out portion 231 closer to the second electrode lead-out portion 232 along the first direction F1, which can make the electrode lead-out portions 23 that need to be point-connected by the bus bar 30 more concentrated, and is beneficial to further shorten the size required for the bus bar 30 to electrically connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232, thereby being beneficial to further reducing the resistance of the bus bar 30.

[0213] In some embodiments, continue to refer to Figure 6 and Figure 7 , the second battery cell 20 includes a third edge 22a and a fourth edge 22b that face each other along the first direction F1. The third edge 22a is closer to the first battery cell 21 than the fourth edge 22b. The maximum distance between the second electrode lead-out portion 232 and the third edge 22a is less than the maximum distance between the second electrode lead-out portion 232 and the fourth edge 22b. That is to say, the minimum distance between the second electrode lead-out portion 232 and the third edge 22a is S3, and the minimum distance between the second electrode lead-out portion 232 and the fourth edge 22b is S4, and S3 < S4.

[0214] The third edge 22a and the fourth edge 22b are two end faces at opposite ends of the outer contour of the second battery cell 22 along the first direction F1. Among them, the third edge 22a is located on the side of the fourth edge 22b closer to the first battery cell 21 along the first direction F1.

[0215] In this way, it is beneficial to make the second electrode lead-out portion 232 closer to the first electrode lead-out portion 231 along the first direction F1, which can make the electrode lead-out portions 23 that need to be point-connected by the bus bar 30 more concentrated, and is beneficial to further shorten the size required for the bus bar 30 to electrically connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232, thereby being beneficial to further reducing the resistance of the bus bar 30.

[0216] There is no limitation on the specific manner in which the bus bar 30 realizes electrical connection with the first electrode lead-out portion 231 and the second electrode lead-out portion 232. For example, the bus bar 30 is made of a metal material, at least part of the first electrode lead-out portion 231 and at least part of the second electrode lead-out portion 232 are made of a metal material, and the bus bar 30 is respectively connected and fixed to the first electrode lead-out portion 231 and the second electrode lead-out through welding to achieve electrical conduction.

[0217] There is no limitation on the type of metal material used for the bus bar 30, the first electrode lead-out portion 231, and the second electrode lead-out portion 232. For example, copper, aluminum, etc.

[0218] In some embodiments, refer to Figure 8 and Fig. 9 , where Figure 8 is Figure 5 a partial enlarged view of A3 in Fig. 9 is Figure 8 a schematic diagram of removing the bus bar 30 connecting the first electrode lead-out portion 231 and the second electrode lead-out portion 232 in . The first electrode lead-out portion 231 includes a first connection portion 2311 connected to the bus bar 30; the first battery cell 20 includes a first edge 21a and a second edge 21b opposed along the first direction F1, and the first edge 21a is closer to the second battery cell 22 than the second edge 21b. The maximum distance between the first connection portion 2311 and the first edge 21a is less than the maximum distance between the first connection portion 2311 and the second edge 21b. That is to say, the maximum distance between the first connection portion 2311 and the first edge 21a is D1, the maximum distance between the first connection portion 2311 and the second edge 21b is D2, and D1 < D2.

[0219] The first connection portion 2311, that is, the portion of the first electrode lead-out portion 231 for realizing electrical connection with the bus bar 30.

[0220] In this way, it is beneficial to make the first connection portion 2311 closer to the second electrode lead-out portion 232 along the first direction F1, which is beneficial to further shorten the size required for the bus bar 30 to realize electrical connection between the first electrode lead-out portion 231 and the second electrode lead-out portion 232, and thus beneficial to further reduce the resistance of the bus bar 30.

[0221] In some embodiments, D1 and D2 satisfy: D2 ≥ 2 * D1, D1 ≥ 3 mm (millimeter).

[0222] Thus, on the one hand, it is beneficial to ensure that there is sufficient spacing between the first connecting portion 2311 and the first edge 21a for the installation of the first electrode lead-out portion 231; on the other hand, it enables the first connecting portion 2311 to be closer to the second electrode lead-out portion 232 in the first direction F1, which is beneficial to further shorten the size required for the bus bar 30 to electrically connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232, thereby helping to further reduce the resistance of the bus bar 30.

[0223] It can be understood that the battery cell 20 has at least two electrode lead-out portions 23, and at least two of the electrode lead-out portions 23 have different polarities.

[0224] In some embodiments, referring back to Fig. 9 , the maximum dimension of the first battery cell 21 in the first direction F1 is D, and D, D1, and D2 satisfy: D1≥3mm, D2≥0.5*D + 3mm.

[0225] Thus, on the one hand, it is beneficial to ensure that there is sufficient spacing between the first connecting portion 2311 and the first edge 21a for the installation of the first electrode lead-out portion 231; on the other hand, it is beneficial to provide another electrode lead-out portion 23 on the first battery cell 20 that is similar in size to the first electrode lead-out portion 231 in the first direction F1 on the side where the first electrode lead-out portion 231 is away from the second battery cell 20 in the first direction F1.

[0226] In some embodiments, referring to Fig.10 , Fig.10 is Figure 8 a schematic diagram of removing the bus bar 30 that connects the first electrode lead-out portion 231 and the second electrode lead-out portion 232. The second electrode lead-out portion 232 includes a third connecting portion 2321 connected to the bus bar 30; the second battery cell 22 includes a third edge 22a and a fourth edge 22b that are opposed to each other in the first direction F1, and the third edge 22a is closer to the first battery cell 21 than the fourth edge 22b. The maximum distance between the third connecting portion 2321 and the third edge 22a is less than the maximum distance between the third connecting portion 2321 and the fourth edge 22b. That is to say, the maximum distance between the third connecting portion 2321 and the third edge 22a is D3, and the maximum distance between the third connecting portion 2321 and the fourth edge 22b is D4, and D3 < D4.

[0227] The third connecting portion 2321, that is, the part of the second electrode lead-out portion 232 used to electrically connect to the bus bar 30.

[0228] Thus, it is beneficial to make the third connecting portion 2321 closer to the first electrode lead portion 231 along the first direction F1, which is beneficial to further shorten the size required for the bus bar 30 to electrically connect the first electrode lead portion 231 and the second electrode lead portion 232, thereby being beneficial to further reduce the resistance of the bus bar 30.

[0229] In some embodiments, continue to refer to Fig.10 , D3 and D4 satisfy: D4≥2*D3, D3≥3mm.

[0230] Thus, on the one hand, it is beneficial to make the third connecting portion 2321 have a sufficient distance from the third edge 22a so that the second electrode lead portion 232 can be installed; on the other hand, it enables the third connecting portion 2321 to be closer to the first electrode lead portion 231 in the first direction F1, which is beneficial to further shorten the size required for the bus bar 30 to electrically connect the first electrode lead portion 231 and the second electrode lead portion 232, thereby being beneficial to further reduce the resistance of the bus bar 30.

[0231] In some embodiments, continue to refer to Fig.10 , the maximum dimension of the first battery cell 20 along the first direction F1 is D', and D', D3 and D4 satisfy: D3≥3mm, D4≥0.5*D'+3mm.

[0232] Thus, on the one hand, it is beneficial to make the third connecting portion 2321 have a sufficient distance from the third edge 22a so that the second electrode lead portion 232 can be installed; on the other hand, it is beneficial to arrange another electrode lead portion 23 on the second battery cell 22, which is similar in size to the second electrode lead portion 232 in the first direction F1, on the side where the second electrode lead portion 232 is away from the first battery cell 21 along the first direction F1.

[0233] In some embodiments, refer to Figures 7 to 10 , in the projection plane perpendicular to the first direction F1, the projections of the first electrode lead portion 231 and the second electrode lead portion 232 along the first direction F1 are at least partially misaligned with each other.

[0234] That is to say, in the projection plane perpendicular to the first direction F1, a part of the projection of the first electrode lead portion 231 coincides with a part of the projection of the second electrode lead portion 232, while another part of the projection of the first electrode lead portion 231 is outside the projection range of the second electrode lead portion 232.

[0235] In this way, the overlapping portion of the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the first direction facilitates the electrical connection of the busbar 30, while it is also beneficial to utilize the non-overlapping portion of the two along the first direction to contact other devices in the battery 100, such as the tabs in the battery cell 20 or the sampling component 40 outside the battery cell 20, so as to reduce the probability of these devices interfering with the electrical connection between the busbar 30 and the first electrode lead-out portion 231.

[0236] In some embodiments, see Figure 5 and Fig.11 , Fig.11 by Figure 5 As an example, Fig.11 for Figure 5 The isometric view of the structure in the middle after the busbar 30 is removed, and the busbar 30 is connected to the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the second direction F2. The busbar 30 is not sandwiched between the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the first direction F1, so as to reduce the probability of the busbar 30 being damaged due to the relative movement between the first battery cell 21 and the second battery cell 22 along the first direction F1, and also facilitate assembly so that the busbar 30 is connected to the first electrode lead-out portion 231 and the second electrode lead-out portion 232 respectively.

[0237] It can be understood that the resistance of the current collector 30 is inversely proportional to its current flow cross-sectional area perpendicular to the current direction.

[0238] It can be understood that the current passes through the bus 30 along the first direction F1 to be transmitted between the first electrode lead-out portion 231 and the second electrode lead-out portion 232. Therefore, the area of ​​the cross-section of the bus 30 perpendicular to the first direction F1 is related to the resistance of the bus 30, and the area of ​​the cross-section of the bus 30 perpendicular to the first direction F1 is related to the size of the cross-section along the second direction F2 and the size of the third direction F3.

[0239] In some embodiments, see Figure 5 , and also see Fig.11 , Fig.12 , Fig.12 for Figure 5 After arranging the busbar 30 in the middle, Figure 5 The third direction F3 is perpendicular to the first direction F1 and the second direction F2; the size of the portion of the first electrode lead-out portion 231 that overlaps with the projection of the second electrode lead-out portion 232 along the first direction F1 along the third direction F3 is L1, and the size of the portion of the first electrode lead-out portion 231 that is misaligned with the projection of the second electrode lead-out portion 232 along the first direction F1 along the third direction F3 is L2, and L1≥L2.

[0240] The bus bar 30 is electrically connected to a portion of the first electrode lead-out portion 231 that overlaps with the second electrode lead-out portion 232 in the projection along the first direction.

[0241] In this way, when the dimension of the first electrode lead-out portion 231 along the third direction F3 is fixed, the dimension of the connection region between the bus bar 30 and the first electrode lead-out portion 231 along the third direction F3 can be increased, which is beneficial to increasing the dimension of the bus bar 30 along the third direction F3, and further beneficial to increasing the current-carrying cross-sectional area of the bus bar 30 and reducing the resistance of the bus bar 30.

[0242] It should be noted that Fig.11 is an axonometric view taking the structure in Figure 5 after removing the bus bar 30 as an example. In some other embodiments, such as Figure 4 the structure in

[0243] In some embodiments, L1 ≥ 2*L2. In this way, it is beneficial to further increase the dimension of the bus bar 30 along the third direction F3, and further beneficial to increasing the current-carrying cross-sectional area of the bus bar 30 and further reducing the resistance of the bus bar 30.

[0244] It should be noted that Fig.11 is an axonometric view taking the structure in Figure 5 after removing the bus bar 30 as an example. In some other embodiments, such as Figure 4 the structure in

[0245] It can be understood that there is a positive correlation between the dimension of the bus bar 30 along the first direction F1 and the resistance of the bus bar 30.

[0246] In some embodiments, continue to refer to Fig.11 and also refer to Fig.13 , Fig.13 is Fig.11 a partial top view of the position A3 in Figure 5 after arranging the bus bar 30 along the second direction F2. The bus bar 30 is connected to the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the second direction F2. The third direction F3 is perpendicular to the first direction F1 and the second direction F2 pairwise; the dimension of the first electrode lead-out portion 231 along the third direction F3 is greater than the dimension of the first electrode lead-out portion 231 along the first direction F1. That is to say, the dimension of the first electrode lead-out portion 231 along the third direction F3 is L3, and the dimension of the first electrode lead-out portion 231 along the first direction F1 is L4, and L3 > L4.

[0247] Thus, it is beneficial to increase the size of the bus bar 30 along the third direction F3, thereby increasing the area of the cross-section of the bus bar 30 perpendicular to the first direction F1, which is beneficial to reducing the resistance of the bus bar 30 to improve the current-carrying capacity of the bus bar 30 and to improve the heat generation problem of the bus bar 30 in the energized state. It should be noted that Figure 5 、 Fig.13 is based on Figure 5 the structure in Figure 3 、 Figure 4 as an example. In some other embodiments, such as

[0248] the structures in

[0249] can also be configured as the structures in these embodiments to achieve the same effect. Figure 3 、 Figure 4 In some embodiments, the size of the first electrode lead-out portion 231 along the third direction F3 is greater than or equal to 2 times the size of the first electrode lead-out portion 231 along the first direction F1. That is, L3≥2*L4.

[0250] It can be understood that the shape of the bus bar 30 itself has a direct impact on achieving the electrical connection effect with the first electrode lead-out portion 231 and the second electrode lead-out portion 232, especially the welding effect.

[0251] In some embodiments, referring to Fig.14 、 Fig.15 and Fig.16 、 Fig.17 and Fig.18 , where Fig.14 is Figure 5 the enlarged layout view of the A3 position in Fig.15 is Fig.14 the cross-sectional view of the bus bar 30 at B-B in Fig.16 is Fig.14Cross-sectional view of the bus bar 30 at the C-C. The bus bar 30 is connected to the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the second direction F2, and the second direction F2 is perpendicular to the first direction F1; the cross-section perpendicular to the first direction F1 of the part of the bus bar 30 that coincides with the first electrode lead-out portion 231 in the projection along the second direction is the first cross-section, and the cross-section perpendicular to the first direction F1 of the part of the bus bar 30 located between the first electrode lead-out portion 231 and the second electrode lead-out portion 232 is the second cross-section. The minimum thickness of the first cross-section along the second direction F2 is less than the minimum thickness of the second cross-section along the second direction F2.

[0252] See Fig.15 and Fig.16 , or, refer to Fig.17 and Fig.18 , the minimum thickness of the first cross-section along the second direction F2 is H1, and the minimum thickness of the second cross-section along the second direction F2 is H2, and H1 < H2. It should be noted that in Fig.18 , the minimum thickness H2 of the second cross-section along the second direction F2 is the sum of the thicknesses of H2' and H2".

[0253] It can be understood that the part of the bus bar 30 that coincides with the first electrode lead-out portion 231 in the projection along the second direction F2 can be the part that realizes electrical connection between the bus bar 30 and the first electrode lead-out portion 231, that is, the part that needs to weld the bus bar 30 and the first electrode lead-out portion 231.

[0254] In this way, on the one hand, by reducing the size of the part of the bus bar 30 that coincides with the first electrode lead-out portion 231 in the projection along the second direction F2 along the second direction F2, it is beneficial to reduce the welding difficulty between the bus bar 30 and the first electrode lead-out portion 231 and improve the welding strength between the bus bar 30 and the first electrode lead-out portion 231; on the other hand, it is beneficial to increase the cross-sectional area of the part of the bus bar 30 that does not need to be welded in the direction perpendicular to the first direction F1, which is beneficial to improving the current-carrying capacity of the bus bar 30.

[0255] The specific structural form of the bus bar 30 is not limited, and it can be a single layer such as Fig.15 and Fig.16 , or it can be a multi-layer structure such as Fig.17 and Fig.18 .

[0256] Exemplarily, continue to refer to Fig.17 and Fig.18 , and refer to Fig.19 , the bus bar 30 includes multiple sub-bus bars 31 stacked and connected to each other along the second direction F2. One end of two adjacent sub-bus bars 31 along the second direction F2 is connected in the third direction F3, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2 in pairs.

[0257] That is to say, multiple sub-busbars 31 are arranged along the second direction F2 with respect to each other, and electrical conduction is achieved through the connected parts and the mutually attached parts between the respective sub-busbars 31.

[0258] In this way, by stacking multiple layers of sub-busbars 31 along the second direction F2, the total size of the busbar member 30 along the second direction F2 can be increased, which is beneficial to increasing the area of the cross-section of the busbar member 30 perpendicular to the first direction F1, thereby reducing the resistance of the busbar member 30 and improving the current-carrying capacity of the busbar member 30.

[0259] In some embodiments, referring further to Fig.19 , the layer of the multiple layers of sub-busbars 31 closest to the first electrode lead-out portion 231 is connected to the first electrode lead-out portion 231, that is, Fig.19 the first sub-busbar 31b in Fig.19 , a through hole or a through groove penetrating along the second direction F2 is provided in the region where the other layers of the multiple layers of sub-busbars 31 project and overlap the first electrode lead-out portion 231 in the second direction, that is, Fig.10 the second sub-busbar 31a in

[0260] Fig.10 That is to say, only the layer of the busbar 31 closest to the electrode lead-out portion 23 along the second direction F2 is used to realize welding with the electrode lead-out portion 23, while the other busbars 31 are only used to form a conduction path, and by providing a through hole or a through groove penetrating along the second direction F2 in the other busbars 31, the surface of the layer of the busbar 31 closest to the electrode lead-out portion 23 along the second direction F2 facing away from the electrode lead-out portion 23 is exposed to the outside, so that the minimum thickness of the first cross-section along the second direction F2 is less than the minimum thickness of the second cross-section along the second direction F2.

[0261]

[0262] In some embodiments, reference may be made to Figure 20 to Figure 22 Figure 20 to Figure 22 Three structures for illustrative purposes. The first battery cell 21 further includes a third electrode lead-out portion 233. In a projection plane perpendicular to the first direction F1, the first electrode lead-out portion 231 and the third electrode lead-out portion 233 project at least partially overlapping along the first direction F1. The first electrode lead-out portion 231 and the third electrode lead-out portion 233 are asymmetric structures with respect to the center of the wall surface where they are located.

[0263] The center of the wall surface where the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are located refers to the geometric center of the wall surface where the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are located on the same wall surface.

[0264] The first electrode lead-out portion 231 and the third electrode lead-out portion 233 are of an asymmetric structure, which means that taking the straight line passing through the center of the wall surface where the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are located and perpendicular to this wall surface as the rotation axis, after the battery cell 20 rotates 180° around this rotation axis, the positions of the rotated first electrode lead-out portion 231 and the third electrode lead-out portion 233 cannot coincide with the positions of the third electrode lead-out portion 233 and the first electrode lead-out portion 231 before rotation respectively.

[0265] On the one hand, it can play a certain anti-misoperation role, facilitating the identification that the placement direction of a single battery cell 20 is different from that of other battery cells 20, and reducing the probability of short circuit between two adjacent battery cells 20; on the other hand, it can be set so that the first electrode lead-out portion 231 and the second electrode lead-out portion 232 can be offset on the wall surface where they are located, so as to form a relatively large area of free space on this wall surface for arranging other components in the battery 100.

[0266] In this way, the first electrode lead-out portion 231 and the third electrode lead-out portion 233 on the wall surface where they are located can be of an asymmetric structure and do not need to be of a symmetric structure, and the position setting of the electrode lead-out portion 23 can be more flexible. For example, multiple electrode lead-out portions 23 on the same battery cell 20 can be set to be biased towards one side, so as to form a relatively large area of free space on this wall surface for arranging other components in the battery 100.

[0267] The first electrode lead-out portion 231 and the third electrode lead-out portion 233 are located on the same battery cell 20, and their polarities are different, one of them is the positive electrode and the other is the negative electrode.

[0268] In this way, the two battery 100 lead-out portions on a single battery cell 20 overlap at least partially with each other in the first direction F1, which is beneficial to the centralized arrangement of the electrode lead-out portions on the single battery cell 20, and is beneficial to forming a regular area on the wall surface of the battery cell 20 for arranging other components in the battery 100.

[0269] In some embodiments, continue to refer to Figure 20 to Figure 22 , the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are located on the same wall surface of the battery cell 20. In this way, other wall surfaces of the battery cell 20 can cooperate with other battery cells 20 and other components in the battery 100.

[0270] In some embodiments, continue to refer to Figure 20 to Figure 22, the second battery cell 20 further includes a fourth electrode lead-out portion 234. In a projection plane perpendicular to the first direction F1, the second electrode lead-out portion 232 and the fourth electrode lead-out portion 234 overlap at least partially in the projection along the first direction F1; both the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are located on the first wall surface 21c of the first battery cell 21, and both the second electrode lead-out portion 232 and the fourth electrode lead-out portion 234 are located on the second wall surface 22c of the second battery cell 22, and the first wall surface 21c and the second wall surface 22c face the same direction; the relative positions of the second electrode lead-out portion 232 and the fourth electrode lead-out portion 234 on the first wall surface 21c are the same as the relative positions of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 on the second wall surface 22c.

[0271] The first wall surface 21c and the second wall surface 22c facing the same direction means that the normal direction of the first wall surface 21c is the same as the normal direction of the second wall surface 22c, and the normal directions of both point in the same direction.

[0272] It can be understood that both the first wall surface 21c and the second wall surface 22c can face the side of the second direction F2.

[0273] The relative distances between the respective edges of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 in the first direction F1 and the third direction F3 can be respectively and identically corresponding to the relative distances between the respective edges of the second electrode lead-out portion 232 and the fourth electrode lead-out portion 234 in the first direction F1 and the third direction F3; the relative distances of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 from the respective edges of the first wall surface 21c in the first direction F1 and the third direction F3 are the same as the relative distances between the respective edges of the second electrode lead-out portion 232 and the fourth electrode lead-out portion 234 in the first direction F1 and the third direction F3. That is, on the first battery cell 21 and the second battery cell 22, the design dimensions of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 on the first wall surface 21c are exactly the same as the design dimensions of the second electrode lead-out portion 232 and the fourth electrode lead-out portion 234 on the second wall surface 22c.

[0274] In this way, it is beneficial to simplify the design of two adjacent battery cells 20 in the battery cell group 10, reduce the production and manufacturing costs. At the same time, it is beneficial to reduce the size of the bus bar 30 connecting the electrode lead-out portions 23 of different battery cells 20, and is beneficial to reducing the resistance of the battery cell 20.

[0275] In some embodiments, reference may be made to Figure 4 、 Figure 5 、 Fig.21 or Fig. 22In any one of the accompanying drawings, in a projection plane perpendicular to the first direction F1, the first electrode lead-out portion 231 and the third electrode lead-out portion 233 may be at least partially misaligned in the projection along the first direction F1.

[0276] That is to say, in a projection plane perpendicular to the first direction F1, at least a part of the projection of the first electrode lead-out portion 231 is located outside the projection range of the third electrode lead-out portion 233.

[0277] In this way, the creepage distance between the two parts where the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are misaligned in the projection along the first direction is increased. Thus, it is beneficial to electrically connect the electrical connection devices with a large creepage distance requirement in the battery 100, such as different sampling terminals of the sampling assembly 40, different-polarity tabs, etc., to the misaligned part of the first electrode lead-out portion 231 and the misaligned part of the third electrode lead-out portion 233 respectively, so as to improve the safety of using the battery 100.

[0278] In some embodiments where the bus bar 30 is connected to the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the second direction F2, and the third direction is perpendicular to the first direction F1 and the second direction F2 pairwise, referring to Fig.23 and Fig.24 , the first electrode lead-out portion 231 has a first end portion 2312 in the third direction F3. In a projection plane perpendicular to the first direction F1, the projection of the first end portion 2312 is misaligned with the projection of the third electrode lead-out portion 233. The third electrode lead-out portion 233 has a second end portion 2331 in the third direction F3. In a projection plane perpendicular to the first direction F1, the projection of the second end portion 2331 is misaligned with the projection of the first electrode lead-out portion 231.

[0279] That is to say, the part where the first electrode lead-out portion 231 is misaligned with the third electrode lead-out portion 233 along the third direction F3 is the first end portion 2312. The first end portion 2312 extends along the first direction F1 and is not blocked by the third electrode lead-out portion 233. The part where the third electrode lead-out portion 233 is misaligned with the first electrode lead-out portion 231 along the third direction F3 is the second end portion 2331, and the second end portion 2331 extends along the first direction F1 and is not blocked by the first electrode lead-out portion 231.

[0280] In this way, it is further beneficial to increase the creepage distance of the first end portion 2312 and the second end portion 2331, beneficial to improve the utilization rate of the first wall surface 21c, and convenient to increase the total outline of the first electrode lead-out portion 231 and the total outline of the second electrode lead-out portion 232, so as to improve the convenience of electrically connecting the first electrode lead-out portion 231 and the second electrode lead-out portion 232 to other devices in the battery 100 and other devices in the battery cell 20 respectively.

[0281] In some embodiments, continue to refer to Fig.23 and Fig.24 , and refer to Figure 13 to Figure 14 wherein, Fig.25 and Fig.26 are exemplified by the structure in Fig.24 . Fig.26 is Fig.25 a partial enlarged view of the D position in . The first battery cell 21 further includes a housing 24, a first internal connection member 25, and a second internal connection member 26. The first internal connection member 25 is located inside the housing 24 and connected to the first end portion 2312, and the second internal connection member 26 is located inside the housing 24 and connected to the second end portion 2331. It should be noted that Fig.23 the first battery cell 21 in

[0282] can also be set to the structure in this embodiment.

[0283] The specific type of the first internal connection member 25 is not limited. For example, it can be a tab or an adapter piece electrically connected to the tab, so that the first electrode lead-out portion 231 is electrically connected to the electrode assembly 27 through the first internal connection member 25.

[0284] It can be understood that the electrode polarities of the first internal connection member 25 and the second internal connection member 26 are different.

[0285] In this way, it is beneficial to increase the creepage distance between the first internal connection member 25 and the second internal connection member 26, and improve the use safety of the battery 100.

[0286] In some embodiments, refer to Fig.24 , the first end portion 2312 protrudes toward the third electrode lead-out portion 233 along the first direction F1. In this way, it is beneficial to increase the size of the first end portion 2312 when the sizes of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 along the first direction F1 are certain, beneficial to increase the size of the connection area between the first end portion 2312 and the first internal connection member 25, improve the over-current capacity, and beneficial to make the arrangement of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 more compact.

[0287] In some embodiments, refer to Fig.24 , in the projection plane perpendicular to the third direction F3, at least part of the projection of the first end portion 2312 is located in the projection of the part of the third electrode lead-out portion 233 outside the second end portion 2331, so as to further facilitate making the arrangement of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 more compact.

[0288] In some embodiments, continue to refer to Fig.24, the second end portion 2331 protrudes towards the first electrode lead portion 231 along the first direction F1.

[0289] In this way, it is beneficial to increase the size of the second end portion 2331 when the sizes of the first electrode lead portion 231 and the third electrode lead portion 233 along the first direction F1 are fixed, which is beneficial to increasing the size of the connection area between the second end portion 2331 and the second internal connection member 26, improving the current-carrying capacity, making the arrangement of the first electrode lead portion 231 and the third electrode lead portion 233 more compact. At the same time, it is beneficial to increase the total outer surface area of the first electrode lead portion 231 and the third electrode lead portion 233, which is beneficial to improving the heat generation situation of the first electrode lead portion 231 and the third electrode lead portion 233 during the current passing process, and enhancing the use safety of the battery 100.

[0290] In some embodiments, reference may be continued to Fig.12 , in the projection plane perpendicular to the third direction F3, at least part of the projection of the second end portion 2331 is located in the projection of the part of the first electrode lead portion 231 outside the first end portion 2312, so as to further facilitate making the arrangement of the first electrode lead portion 231 and the third electrode lead portion 233 more compact.

[0291] In some embodiments, the electrode lead portion 23 can be limited and fixed in each direction.

[0292] In some embodiments, reference is made to Figure 25 to Figure 29 , the battery cell 20 further includes a housing 24 and an electrode assembly 27. The housing 24 has an accommodation space 24a. The housing 24 includes a first housing wall 241. Along the wall thickness direction of the first housing wall 241, the electrode assembly 27 is disposed in the accommodation space 24a; the electrode lead portion 23 is disposed on the first housing wall 241. The electrode lead portion 23 includes a first electrode lead portion 231 and a third electrode lead portion 233. At least part of the first electrode lead portion 231 is disposed between the third electrode lead portion 233 and the first housing wall 241, and the first electrode lead portion 231 abuts against the third electrode lead portion 233.

[0293] The housing 24 is used to form at least part of the outer contour surface of the battery cell 20. The accommodation space 24a in the housing 24 provides an installation space and a protection function for other devices in the battery cell 20.

[0294] In some embodiments, the electrolyte can be stored in the accommodation space 24a, and an electrochemical reaction occurs between the electrode assembly 27 and the electrolyte to achieve the charge and discharge functions of the battery cell 20.

[0295] The housing wall refers to the solid structure of each inner wall in the housing 24 that forms the accommodation space 24a.

[0296] The first housing wall 241 refers to any housing wall of the housing 24 .

[0297] The electrode lead-out portion 23 is disposed through the first shell wall 241 so as to be electrically connected to the electrode assembly 27 , and a portion of the electrode lead-out portion 23 is located outside the shell 24 so as to be electrically connected to other devices in the battery 100 .

[0298] At least a portion of the first electrode lead-out portion 231 is arranged between the third electrode lead-out portion 233 and the first shell wall 241, that is, a gap is formed relatively between at least a portion of the third electrode lead-out portion 233 and the first shell wall 241, and at least a portion of the first electrode lead-out portion 231 is located in the gap formed by the two, so that the third electrode lead-out portion 233 and the first shell wall 241 can achieve a stopping effect on the first electrode lead-out portion 231 along the relative directions between the two.

[0299] In this way, the first housing wall 241 and the third electrode lead-out portion 233 can directly limit the first electrode lead-out portion 231 , which is beneficial to simplify the related components for fixing the first electrode lead-out portion 231 on the battery cell 20 and reduce the number of components.

[0300] In some embodiments, the thickness direction of the first housing wall 241 is the second direction F2.

[0301] It can be understood that the first wall surface 21 c is the surface of the first shell wall 241 facing away from the accommodating space 24 a.

[0302] In some embodiments, see Fig.28 and Fig.29 A portion of the third electrode lead-out portion 233 is spaced from the first shell wall 241 along the second direction F2 to stop the first electrode lead-out portion 231 in the second direction F2.

[0303] In some embodiments, the polarities of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 may be different, and the housing 24 is made of a metal material and thus has conductivity.

[0304] In some embodiments, see Fig.28 and Fig.29 The third electrode lead-out portion 233 includes an electrode terminal 2332 and a first insulating member 2333 , the electrode terminal 2332 is fixed to the first insulating member 2333 , the first electrode lead-out portion 231 is at least partially disposed between the first insulating member 2333 and the first shell wall 241 , and the first insulating member 2333 abuts against the first electrode lead-out portion 231 .

[0305] The electrode terminal 2332, which has electrical conductivity and is used for electrically connecting with the electrode assembly 27, and a part of the electrode terminal 2332 is located outside the housing 24 so that the electrode terminal 2332 can be electrically connected with other devices in the battery 100.

[0306] The first insulating member 2333, which has insulation property.

[0307] In this embodiment, the third electrode lead-out portion 233 can be stopped and limited between the first insulating member 2333 and the first housing wall 241. At the same time, the first insulating member 2333 separates the electrode terminal 2332 from the first electrode lead-out portion 231.

[0308] In this way, the probability of direct electrical conduction between the third electrode lead-out portion 233 and the first electrode lead-out portion 231 is reduced by the first insulating member 2333. At the same time, the risk of short circuit caused by direct electrical conduction between the electrode terminal 2332 and the first housing wall 241 is also reduced, improving the safety of use of the battery 100.

[0309] In some embodiments, referring to Fig.29 , the battery cell 20 further includes a second insulating member 28, and the second insulating member 28 is at least partially located between the first electrode lead-out portion 231 and the first housing wall 241. That is to say, the second insulating member 28 separates between the first electrode lead-out portion 231 and the first housing wall 241.

[0310] The second insulating member 28, which has insulation property.

[0311] In this way, the risk of short circuit caused by direct electrical conduction between the first electrode lead-out portion 231 and the first housing wall 241 is reduced, improving the safety of use of the battery 100.

[0312] The specific materials of the first insulating member 2333 and the second insulating member 28 are not limited, such as engineering plastics.

[0313] In some embodiments, the first insulating member 2333 and the second insulating member 28 are integrally formed parts. That is to say, the first insulating member 2333 and the second insulating member 28 are respectively different parts of the same integral component.

[0314] In this way, it is convenient to integrally form the first insulating member 2333 and the second insulating member 28 at one time, which is beneficial to improving production efficiency; it is beneficial to simplify the assembly process and improve the production efficiency of the battery cell 20.

[0315] In some embodiments, referring to Figure 25 to Figure 29, the first electrode lead-out portion 231 includes a first terminal plate 2314, at least a part of the first terminal plate 2314 is disposed on a side of the first housing wall 241 facing away from the accommodation space 24a, the electrode terminal 2332 includes a second terminal plate 2332a, the second terminal plate 2332a is disposed on a side of the first housing wall 241 facing away from the accommodation space 24a, and the first insulating member 2333 is fixed to the first terminal plate 2314;

[0316] Along the wall thickness direction of the first housing wall 241, the first terminal plate 2314, the first insulating member 2333 and the second terminal plate 2332a partially overlap, and the second terminal plate 2332a is partially disposed between the first insulating member 2333 and the first housing wall 241, and the first terminal plate 2314 abuts against the first insulating member 2333.

[0317] It can be understood that, since the first terminal plate 2314 and the first insulating member 2333 overlap along the wall thickness direction of the first housing wall 241, the first terminal plate 2314 abuts against the first insulating member 2333 at least along the wall thickness direction of the first housing wall 241.

[0318] In these embodiments, the first terminal plate 2314 and the second terminal plate 2332a are located outside the housing 24, so that both the first terminal plate 2314 and the second terminal plate 2332a are used for electrically connecting to other components in the battery 100 such as the bus bar 30.

[0319] In this way, the abutting portion between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 is located outside the accommodation space 24a, reducing the probability of interference between the abutting position of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 and the positions where the electrode assembly 27 is electrically connected to the first electrode lead-out portion 231 and the third electrode lead-out portion 233 respectively.

[0320] In some embodiments, referring to Fig.25 and Fig.26 , the first electrode lead-out portion 231 further includes a first terminal disk 2315, at least a part of the first terminal disk 2315 is disposed on a side of the first housing wall 241 facing the accommodation space 24a, the electrode terminal 2332 further includes a second terminal disk 2332b, and the second terminal disk 2332b is disposed on a side of the first housing wall 241 facing the accommodation space 24a;

[0321] Along the wall thickness direction of the first housing wall 241, the first terminal disk 2315 is at least partially disposed between the second terminal disk 2332b and the first housing wall 241; or, along the wall thickness direction of the first housing wall 241, the second terminal disk 2332b is at least partially disposed between the first terminal disk 2315 and the first housing wall 241.

[0322] In these embodiments, the first terminal plate 2315 and the second terminal plate 2332b are located inside the housing 24 such that both the first terminal plate 2315 and the second terminal plate 2332b are used for electrically connecting with the electrode assembly 27.

[0323] The first terminal plate 2315 is at least partially disposed between the second terminal plate 2332b and the first housing wall 241. It is possible that a part of the first terminal plate 2315 is restricted by the second terminal plate 2332b and the first housing wall 241 along the wall thickness direction of the first housing wall 241.

[0324] The second terminal plate 2332b is at least partially disposed between the first terminal plate 2315 and the first housing wall 241. It is possible that a part of the second terminal plate 2332b is restricted by the first terminal plate 2315 and the first housing wall 241 along the wall thickness direction of the first housing wall 241.

[0325] In this way, through the first terminal plate 2315, the second terminal plate 2332b, and the first housing wall 241, it is possible to further limit the first electrode lead-out portion 231 or the third electrode lead-out portion 233 along the wall thickness direction of the first housing wall 241.

[0326] It can be understood that at least two through holes communicating with the accommodation space 24a are provided on the first housing wall 241. One through hole is for the first electrode lead-out portion 231 to pass through, and the other through hole is for the second electrode lead-out portion 232 to pass through.

[0327] It can be understood that in the projection plane perpendicular to the second direction F2, the projection of the through hole through which the first electrode lead-out portion 231 passes is at least partially within the projection range of the first terminal plate 2314 and within the projection range of the first terminal plate 2315.

[0328] In the projection plane perpendicular to the second direction F2, the projection of the through hole through which the first electrode lead-out portion 231 passes is at least partially within the projection range of the first terminal plate 2314 and within the projection range of the first terminal plate 2315.

[0329] In some embodiments, referring to Fig.29 , the third electrode lead-out portion 233 is provided with a first protrusion 233a, and the first electrode lead-out portion 231 is provided with a first recess 231a. The first protrusion 233a and the first recess 231a at least partially overlap along the wall thickness direction of the first housing wall 241, and the first protrusion 233a and the first recess 231a cooperate with each other.

[0330] The first recessed portion 231a can form one or more recessed spaces for accommodating at least part of the first protruding portion 233a, and the inner wall of the recessed space formed by the first recessed portion 231a abuts against the first protruding portion 233a.

[0331] In this way, along the wall thickness direction of the first housing wall 241, between the first protruding portion 233a and the second protruding portion 231d, the purpose of abutting the first electrode lead-out portion 231 against the third electrode lead-out portion 233 is achieved.

[0332] In some embodiments, the first recessed portion 231a includes a first stepped portion 231b and a second stepped portion 231c, and the second stepped portion 231c is disposed on a side of the first stepped portion 231b away from the third electrode lead-out portion 233;

[0333] The first protruding portion 233a includes a first protruding portion provided on the electrode terminal 2332. Along the wall thickness direction of the first housing wall 241, a part of the first electrode lead-out portion 231 is located between the first protruding portion and the first housing wall 241, and at least part of the first protruding portion is accommodated in the stepped space formed by the first stepped portion 231b;

[0334] The first protruding portion 233a further includes a first covering portion 2333a provided on the first insulating member 2333. Along the wall thickness direction of the first housing wall 241, a part of the first electrode lead-out portion 231 is located between the first covering portion 2333a and the first housing wall 241, and at least part of the first covering portion 2333a is accommodated in the stepped space formed by the second stepped portion 231c.

[0335] Refer to Fig.29 , the first stepped portion 231b refers to the part of the first electrode lead-out portion 231 within the dashed box indicated by the label 231b in the figure; the second stepped portion 231c refers to the part of the first electrode lead-out portion 231 within the dashed box indicated by the label 231c in the figure.

[0336] The stepped space formed by the first stepped portion 231b refers to the space surrounded by the physical structure of the first stepped portion 231b.

[0337] It can be understood that through the stepped space formed by the first stepped portion 231b, the first protruding portion 2332c can be limited in the thickness direction of the first housing wall 241 and in the direction perpendicular to the thickness direction of the first housing wall 241.

[0338] The stepped space formed by the second stepped portion 231c refers to the space surrounded by the physical structure of the second stepped portion 231c.

[0339] It can be understood that the step space formed by the second step portion 231 c can limit the first covering portion 2333 a along the thickness direction of the first shell wall 241 and perpendicular to the thickness direction of the first shell wall 241 .

[0340] The first covering portion 2333a can separate the first protruding portion 2332c and the first recessed portion 231a perpendicularly to the thickness direction of the first shell wall 241, so as to facilitate increasing the distance between the surface of the first protruding portion 2332c that is away from the first shell wall 241 along the thickness direction of the first shell wall 241 and the surface of the first electrode lead-out portion 231 that is away from the first shell wall 241 along the thickness direction of the first shell wall 241.

[0341] In this way, the first step portion 231b and the second step portion 231c are conducive to achieving the limiting effect between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 along the wall thickness direction of the first shell wall 241 and perpendicular to the wall thickness direction of the first shell wall 241; it is conducive to increasing the creepage distance between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 through the first covering portion 2333a, reducing the probability of short circuit between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 due to foreign matter, and improving the safety of battery 100.

[0342] In some embodiments, see Fig.29 , the first extension portion 2332c is a portion of the second terminal plate 2332a.

[0343] In some embodiments, see Fig.29 A portion of the first covering portion 2333a is located in the step space formed by the first step portion 231b, so as to separate the first protruding portion 233a and the first recessed portion 231a.

[0344] In some embodiments, along the wall thickness direction of the first shell wall 241, the height difference between the surface of the first terminal plate 2314 on the side facing away from the first shell wall 241 and the surface of the second terminal plate 2332a on the side facing away from the first shell wall 241 is greater than or equal to 0 and does not exceed 0.5 mm.

[0345] This helps to reduce the probability that the first electrode lead portion 231 and the second electrode lead portion 232 interfere with other devices electrically connected to the other.

[0346] In some embodiments, see Fig.29 Along the wall thickness direction of the first shell wall 241 , the first terminal plate 2314 is at least partially disposed between the second terminal plate 2332 a and the first shell wall 241 .

[0347] In this way, the first terminal plate 2314 is limited by the second terminal plate 2332a and the second first housing wall 241.

[0348] It can be understood that the wall thickness direction of the first housing wall 241 is the second direction F2.

[0349] It can be understood that at least a part of the first insulating member 2333 is located between the first terminal plate 2314 and the second terminal plate 2332a, and the second insulating member 28 is located between the second terminal plate 2332a and the first housing wall 241.

[0350] It can be understood that a part of the first terminal plate 2314 forms the first end portion 2312, and another part forms the first connection portion 2311; a part of the second terminal plate 2332a forms the second end portion 2331.

[0351] In some embodiments, refer to Fig.29 , along the wall thickness direction of the first housing wall 241, the surface of the side of the first covering portion 2333a facing away from the first housing wall 241 and the surface of the side of the first terminal plate 2314 facing away from the first housing wall 241 are located in the same plane.

[0352] That is to say, in the wall thickness direction of the first housing wall 241, a part of the surface of the first covering portion 2333a is flush with a part of the surface of the first terminal plate 2314.

[0353] In this way, the probability of the first covering portion 2333a interfering with other devices connected to the first terminal plate 2314 is reduced.

[0354] In some embodiments, refer to Fig.29 , along the wall thickness direction of the first housing wall 241, the surface of the side of the first covering portion 2333a facing away from the first housing wall 241 and the surface of the side of the second terminal plate 2332a facing away from the first housing wall 241 are located in the same plane.

[0355] That is to say, in the wall thickness direction of the first housing wall 241, a part of the surface of the first covering portion 2333a is flush with a part of the surface of the second terminal plate 2332a.

[0356] In this way, the probability of the first covering portion 2333a interfering with other devices connected to the second terminal plate 2332a is reduced.

[0357] In some embodiments, refer to Fig. 27 and Fig.28, the first terminal board 2314 includes a first main body portion 2314a and a first extension portion 2314b connected to each other, and the second terminal board 2332a includes a second main body portion 2332e and a second extension portion 2332f connected to each other. Along the length direction of the first housing wall 241, the first extension portion 2314b and the second extension portion 2332f are located between the first main body portion 2314a and the second main body portion 2332e, and the first extension portion 2314b and the second extension portion 2332f are arranged in length along the width direction of the first housing wall 241.

[0358] The length direction of the first housing wall 241 refers to the length direction among the three-dimensional dimensions of the first housing wall 241, that is, the direction where the longest dimension is located.

[0359] The width direction of the first housing wall 241 refers to the linear direction perpendicular to the length direction and the thickness direction of the first housing wall 241.

[0360] The first extension portion 2314b extends toward the second main body portion 2332e along the length direction of the first housing wall 241, and the second extension portion 2332f extends toward the first main body portion 2314a along the length direction of the first housing wall 241.

[0361] In this way, through the first extension portion 2314b and the second extension portion 2332f, it is convenient to realize the electrical connection with the bus bar 30, which is beneficial to utilize the characteristic that there is a large amount of space in the length direction of the first housing wall 241 to increase the contact area between the first extension portion 2314b and the second extension portion 2332f and the bus bar 30 respectively; the two are arranged along the width direction of the first housing wall 241, which is beneficial to make the arrangement of the first extension portion 2314b and the second extension portion 2332f more concentrated, and realize the electrical connection with other devices in the battery 100 such as the sampling assembly 40 through the first main body portion 2314a and the second main body portion 2332e, reducing the probability of interference when the first terminal board 2314 and the second terminal board 2332a are electrically connected to other devices respectively.

[0362] In some embodiments, the length direction of the first housing wall 241 is the third direction F3, and the width direction of the first housing wall 241 is the first direction F1.

[0363] It can be understood that, in some embodiments, the first main body portion 2314a forms the first end portion 2312, the first extension portion 2314b forms the first connection portion 2311, and the second main body portion 2332e forms the second end portion 2331.

[0364] It can be understood that the first extension portion 2314b and the second extension portion 2332f are arranged at intervals along the first direction F1.

[0365] It can be understood that the dimensions of the first extension portion 2314b and the second extension portion 2332f along the first direction F1 can only be small, which is conducive to reducing the dimension of the battery cell 20 along the first direction F1. At the same time, it is convenient to reduce the dimension of the bus bar 30 that is respectively connected to the first extension portion 2314b and the second extension, so as to reduce the resistance of the bus bar 30.

[0366] In some embodiments, referring to Fig.25 and Fig.26 , the first electrode lead-out portion 231 further includes a first terminal plate 2315, at least a part of the first terminal plate 2315 is disposed on the side of the first housing wall 241 facing the accommodation space, the electrode terminal 2332 further includes a second terminal plate 2332b, the second terminal plate 2332b is disposed on the side of the first housing wall 241 facing the accommodation space 24a, and the first main body portion 2314a and the first terminal plate 2315 are directly connected through a first connecting column 2316; the second main body portion 2332e and the second terminal plate 2332b are directly connected through a second connecting column 2332g.

[0367] In this way, the electrical connection between the first terminal plate 2314 and the first terminal plate 2315 is realized, and the electrical connection between the second terminal plate 2332a and the second terminal plate 2332b is realized, which is conducive to reducing the through holes on the housing 24 for respectively passing through the first electrode lead-out portion 231 and the third electrode lead-out portion 233.

[0368] It can be understood that a part of the first housing wall 241 is located between the first main body portion 2314a and the first terminal plate 2315, so as to realize the limit of the first main body portion 2314a and the first terminal plate 2315 in the thickness direction of the first housing wall 241, thereby playing a role of positioning and constraining the first main body portion 2314a; a part of the first housing wall 241 is located between the second main body portion 2332e and the second terminal plate 2332b, so as to realize the limit of the second main body portion 2332e and the second terminal plate 2332b in the thickness direction of the first housing wall 241, thereby playing a role of positioning and constraining the second main body portion 2332e.

[0369] Since the first extension portion 2314b is far from the first main body portion 2314a, the influence of the constraint on it is small, and it is easy to have problems such as warping in the thickness direction of the first housing wall 241. Therefore, it is necessary to further constrain the first extension portion 2314b.

[0370] In some embodiments, referring to Figure 27 to Figure 29 , the first recessed portion 231a is disposed on the side of the first extension portion 2314b facing the electrode terminal 2332, and the first protruding portion 233a is disposed on the side of the second main body portion 2332e facing the first electrode lead-out portion 231.

[0371] In this way, the second main body portion 2332e realizes the limiting and restraining effects on the first extension portion 2314b in the thickness direction of the first housing wall 241, reducing the probability that problems such as warping of the first extension portion 2314b affect its normal function.

[0372] Since the first extension portion 2314b and the second extension portion 2332f are far from the second main body portion 2332e, the restraint effect on them is small, and problems such as warping are likely to occur in the thickness direction of the first housing wall 241. Therefore, it is necessary to further restrain the second extension portion 2332f.

[0373] In some embodiments, referring to Fig. 27 、 Fig.30 and Fig.31 the electrode terminal 2332 is further provided with a second recessed portion 2332d, a part of the first electrode lead-out portion 231 forms at least part of the second protruding portion 231d, and the second protruding portion 231d and the second recessed portion 2332d at least partially overlap in the wall thickness direction of the first housing wall 241, and the second protruding portion 231d and the second recessed portion 2332d cooperate with each other;

[0374] The second recessed portion 2332d is provided on the side of the second extension portion 2332f facing the first electrode lead-out portion 231, and the second protruding portion 231d is provided on the side of the first main body portion 2314a facing the electrode terminal 2332.

[0375] The first recessed portion 231a of the first electrode lead-out portion 231 is located between the first protruding portion 233a of the third electrode lead-out portion 233 and the first housing wall 241, and the second recessed portion 2332d of the third electrode lead-out portion 233 is located between the second protruding portion 231d of the first electrode lead-out portion 231 and the first housing wall 241, thereby realizing the interlocking between the first electrode lead-out portion 231 and the third electrode lead-out portion 233.

[0376] In this way, the probability that problems such as warping of the second extension portion 2332f affect its normal function is reduced. On the basis of realizing the limiting of the second extension portion 2332f, the first electrode lead-out portion 231 and the third electrode lead-out portion 233 are further mutually limited, which is more conducive to fixing their relative positions.

[0377] In some embodiments, referring to Fig.31 the second recessed portion 2332d includes a third stepped portion 2332h and a fourth stepped portion 2332j, and the fourth stepped portion 2332j is provided on the side of the third stepped portion 2332h away from the first electrode lead-out portion 231;

[0378] The second protruding portion 231d includes a second protruding portion 231e provided on the first electrode lead portion 231. Along the wall thickness direction of the first housing wall 241, a part of the electrode terminal 2332 is located between the second protruding portion 231e and the first housing wall 241, and the second protruding portion 231e is at least partially received in the stepped space formed by the third stepped portion 2332h;

[0379] The battery cell 20 further includes a second insulating member 28. The second insulating member 28 is at least partially located between the first electrode lead portion 231 and the first housing wall 241. The second protruding portion 231d further includes a second covering portion 28a provided on the second insulating member 28. Along the wall thickness direction of the first housing wall 241, a part of the electrode terminal 2332 is located between the second covering portion 28a and the first housing wall 241, and the second covering portion 28a is at least partially received in the stepped space formed by the fourth stepped portion 2332j.

[0380] The third stepped portion 2332h refers to the part of the third electrode lead portion 233 within the dashed box indicated by the label 2332h in the figure; the fourth stepped portion 2332j refers to the part of the third electrode lead portion 233 within the dashed box indicated by the label 2332j in the figure.

[0381] The stepped space formed by the third stepped portion 2332h refers to the space surrounded by the solid structure of the third stepped portion 2332h.

[0382] It can be understood that through the stepped space formed by the third stepped portion 2332h, the second protruding portion 231e can be limited in the thickness direction of the first housing wall 241 and in the direction perpendicular to the thickness direction of the first housing wall 241.

[0383] The stepped space formed by the fourth stepped portion 2332j refers to the space surrounded by the solid structure of the fourth stepped portion 2332j.

[0384] It can be understood that through the stepped space formed by the fourth stepped portion 2332j, the second covering portion 28a can be limited in the thickness direction of the first housing wall 241 and in the direction perpendicular to the thickness direction of the first housing wall 241.

[0385] In this way, the third step portion 2332h and the fourth step portion 2332j are used to facilitate the limiting effect between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 along the wall thickness direction of the first shell wall 241 and perpendicular to the wall thickness direction of the first shell wall 241, which is further beneficial to improve the stability of the interlocking between the first electrode lead-out portion 231 and the third electrode lead-out portion 233; it is beneficial to increase the creepage distance between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 through the second covering portion 28a, reduce the probability of short circuit between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 due to foreign matter, and improve the safety of battery 100.

[0386] In some embodiments, see Fig.31 , the second extension portion 231e is a part of the first terminal plate 2314.

[0387] In some embodiments, see Fig.31 A portion of the second covering portion 28a is located in the step space formed by the third step portion 2332h, so as to separate the second protruding portion 231d and the second recessed portion 2332d.

[0388] In some embodiments, see Fig. 27 and Fig.31 The second extension portion 2332f is connected to the second terminal plate 2332b through the third connecting column 2332i, the first recessed portion 231a is arranged on the side of the first extension portion 2314b facing the electrode terminal 2332, and the first protruding portion 233a is arranged on the side of the second extension portion 2332f facing the first electrode lead-out portion 231.

[0389] In this way, the purpose of suppressing the first extending portion 2314b from tilting up is indirectly achieved by fixing the second extending portion 2332f by the third connecting column 2332i.

[0390] There is no limitation on the method of fixing the third connection column 2332i relative to the first shell wall 241, for example, riveting.

[0391] In some embodiments, see Fig.33 , the busbar 30 is connected to the electrode lead-out portion 23 along the second direction F2, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2; the electrode lead-out portion 23 is located on the first wall surface 21c of the battery cell 20, and the first wall surface 21c includes a first boundary 21d and a second boundary 21e opposite to each other along the third direction F3, and the minimum distance between the electrode lead-out portion 23 and the first boundary 21d is less than the minimum distance between the electrode lead-out portion 23 and the second boundary 21e. In other words, the minimum distance between the electrode lead-out portion 23 and the first boundary 21d is L5, and the minimum distance between the electrode lead-out portion 23 and the second boundary 21e is L6, and L5<L6.

[0392] It should be noted that the minimum distance between the electrode lead-out portion 23 and the first boundary 21d refers to the distance between the point on the first wall surface 21c that is closest to the first boundary 21d among all the electrode lead-out portions 23 and the first boundary 21d; the minimum distance between the electrode lead-out portion 23 and the second boundary 21e refers to the distance between the point on the first wall surface 21c that is closest to the second boundary 21e among all the electrode lead-out portions 23 and the second boundary 21e.

[0393] In this way, it is beneficial to make the range of the region where the first wall surface 21c is located along the third direction F3 close to the second boundary 21e larger, which is convenient for arranging other devices in the battery 100 in this region.

[0394] In some embodiments, referring to Fig.33 , the bus bar 30 is connected to the electrode lead-out portion 23 along the second direction F2, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2 in pairs;

[0395] All the electrode lead-out portions 23 on the same battery cell 20 are located on the same wall surface. On the same battery cell 20, the distance between the two farthest points of adjacent electrode lead-out portions 23 along the third direction F3 is less than or equal to one-half of the maximum dimension of the wall surface along the third direction F3. That is to say, on the same battery cell 20, the distance between the two farthest points of adjacent electrode lead-out portions 23 along the third direction F3 is L7, and the maximum dimension of the wall surface along the third direction F3 is L8, and L7 ≤ L8.

[0396] In this way, on one wall surface, the electrode lead-out portions 23 are concentratedly arranged. Thus, through the mutual cooperation of the electrode lead-out portions 23, the strength of the stud configuration area in this wall surface and even the entire wall surface can be improved, which is beneficial to reducing the risk of deformation of the wall surface and enhancing the use safety of the battery cell 20. In addition, it is beneficial to make full use of other areas of this wall surface and other wall surfaces, and it is also beneficial to the centralized processing of the studs and other devices attached to the battery 100 during processing and maintenance.

[0397] In some embodiments, referring to Fig.34 , the battery 100 further includes a sampling component 40. The sampling component 40 is electrically connected to the battery cell 20, and the sampling component 40 can be located on the same side of all the electrode lead-out portions 23 along the third direction F3.

[0398] The sampling component 40 is used to collect information such as the temperature and voltage of the battery cell 20 by being electrically connected to the battery cell 20, and transmit this information to the battery management system (Battery Management System, BMS) in the battery 100, so as to monitor the working state of the battery cell 20.

[0399] In these embodiments, all the electrode lead-out portions 23 are centrally arranged on the same side of the sampling assembly 40 along the third direction F3. The sampling assembly 40 may be on the same wall surface of the battery cell 20 as all the electrode lead-out portions 23, or may be on different wall surfaces. In this way, it is beneficial for the sampling assembly 40 to directly extend along the first direction F1 and achieve electrical connection with each battery cell 20 in the battery cell group 10, reducing the possibility of interference between the arrangement of the sampling assembly 40 and the electrode lead-out portions 23.

[0400] In some embodiments, referring to Fig.34 , both the sampling assembly 40 and the electrode lead-out portions 23 are located on the first wall surface 21c of the battery cell 20. That is to say, both the sampling assembly 40 and the electrode lead-out portions 23 are on the same wall surface of the battery cell 20. In this way, it is convenient for the sampling assembly 40 to achieve electrical connection with each electrode lead-out portion 23, which is beneficial to reducing the size required for the sampling assembly 40 to achieve electrical connection with the electrode lead-out portions 23, and beneficial to making the overall size of the battery 100 more compact. It should be noted that the structural embodiments in Figures 3 to 5 and Figure 20 to Figure 22 can also be applied to the setting of the sampling assembly 40 in this embodiment and can also have the excellent effects described in this embodiment.

[0401] In some embodiments, continuing to refer to Fig.33 and Fig.34 , the first wall surface 21c includes a first boundary 21d and a second boundary 21e that are opposed to each other along the third direction F3. The minimum distance between the electrode lead-out portion 23 and the first boundary 21d is less than the minimum distance between the electrode lead-out portion 23 and the second boundary 21e, and at least a part of the sampling assembly 40 is located between the electrode lead-out portion 23 and the second boundary 21e.

[0402] In this way, a relatively large area for arranging the sampling assembly 40 can be formed on the first wall surface 21c, which is beneficial to improving the flexibility of the arrangement of the sampling assembly 40 and reducing the probability of interference between the arrangement of the sampling assembly 40 and the electrode lead-out portions 23. It should be noted that the structures in Fig. 20 and Fig. 22 can also be applied to the setting of the sampling assembly 40 in this embodiment and can also have the excellent effects described in this embodiment.

[0403] It can be understood that during the charging and discharging process of the battery cell 20, the electrode lead-out portion 23 generates heat. Therefore, it is necessary for the sampling assembly 40 to be able to collect the temperature change information led out by the battery 100.

[0404] In some embodiments where a sampling component 40 is provided, and the bus bar 30 is connected to the first electrode lead-out portion 231 and the second electrode lead-out portion 232 along the second direction F2, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2 pairwise, continue to refer to Fig.34 , and also refer to Fig.23 , the first electrode lead-out portion 231 includes a first connection portion 2311 and a second connection portion 2313 with different positions. The first connection portion 2311 is connected to the bus bar 30, and the second connection portion 2313 is connected to the sampling component 40. The minimum dimension of the first connection portion 2311 along the third direction F3 is greater than the minimum dimension of the second connection portion 2313 along the third direction F3.

[0405] It can be understood that the requirement for the overcurrent capacity of the current by the sampling component 40 is lower than the requirement for the overcurrent capacity of the current by the bus bar 30.

[0406] In this way, when the dimension of the electrode lead-out portion 23 along the third direction F3 is fixed, the first connection portion 2311 has a larger dimension than the second connection portion 2313 along the third direction F3, which is beneficial for the bus bar 30 to have a larger dimension along the third direction F3, thereby helping to reduce the resistance of the bus bar 30 and improve the overcurrent capacity of the bus bar 30. At the same time, a second connection portion 2313 dedicated to connecting with the sampling component 40 is provided on the electrode lead-out portion 23, reducing the probability of interference between the bus bar 30 and the sampling component 40.

[0407] It can be understood that a part of the sampling component 40 can be connected to the second connection portion 2313 along the second direction F2.

[0408] It can be understood that the second connection portion 2313 can be the first main body portion 2314a and the first end portion 2312 in the foregoing text.

[0409] In some embodiments, continue to refer to Fig.35 , the second connection portion 2313 is located at one end of the first electrode lead-out portion 231 close to the sampling component 40 along the third direction F3 for connecting the sampling component 40, and the first connection portion 2311 is located at the other end of the first electrode lead-out portion 231.

[0410] That is to say, the second connection portion 2313 is located between the first connection portion 2311 and the sampling component 40 along the third direction F3.

[0411] In this way, the second connection portion 2313 is closer to the sampling component 40 in the third direction F3, which is beneficial for reducing the dimension required for the connection between the sampling component 40 and the second connection portion 2313, and further beneficial for reducing the probability that the information collected is affected due to interference between the sampling component 40 and other devices.

[0412] It is understandable that during the process of current flowing through the bus bar 30, due to the resistance of the bus bar 30 itself, heat will also be generated during the current collection.

[0413] In some embodiments, the sampling component 40 can also be connected to the bus bar 30 to obtain some information required for battery detection, such as at least one of voltage information, current information, and temperature information.

[0414] In some other embodiments, the sampling component 40 can be connected to both the bus bar 30 and the electrode lead-out portion 23 to respectively obtain some information required for battery 100 detection, such as at least one of voltage information, current information, and temperature information.

[0415] In some embodiments where the sampling component 40 is connected to the bus bar 30, refer to Fig.35 , the bus bars 30 adjacent to each other along the first direction F1 on the upper edge of the same battery cell group 10 overlap in projection along the first direction F1.

[0416] In this way, the bus bars 30 in the battery 100 can be arranged more concentratedly, which is convenient for centralized protection of the electrical connection area, can save the use of protective materials and thus reduce costs. And in some embodiments where the sampling component 40 is connected to the bus bar 30, the bus bars 30 on the same battery cell group 10 can be arranged along the first direction F1, which is beneficial to making the dimensions of the respective portions of the sampling component 40 for connecting to the bus bars 30 extend along the third direction F3 to the respective bus bars 30 approximately the same, and is beneficial to reducing the design and manufacturing costs of the sampling component 40.

[0417] It is understandable that there can be only one battery cell group 10 in the battery 100, or there can be multiple battery cell groups 10.

[0418] In some embodiments, refer to Figure 36 to Figure 39 , the battery 100 includes a box body 50, the box body 50 includes a receiving cavity 50a and a first box wall 51, the first box wall 51 is used to enclose the receiving cavity 50a, and at least a part of the inner surface of the first box wall 51 protrudes outward from the outer surface to form a recess 511 on the inner surface.

[0419] The battery cell group 10 is located in the receiving cavity 50a. The space in the recess 511 is communicated with the receiving cavity 50a.

[0420] In this way, at least a part of other devices in the battery 100 can be accommodated in the space of the recess 511, which is beneficial to making the space for arranging the battery cells 20 in the receiving cavity 50a more regular and improving the space utilization rate of the box body 50.

[0421] In some embodiments, the first box wall 51 is the top cover 53.

[0422] In some embodiments, the electrode lead-out portion 23 protrudes from the surface of the battery cell 20.

[0423] In some embodiments, referring to Fig.39 , the recess 511 can accommodate at least a part of the electrode lead-out portion 23. In this way, the shape of the space in the accommodation cavity 50a better adapts to the shape of the part of the battery cell 20 other than the electrode lead-out portion 23, which is beneficial to improving the space utilization rate in the box body 50.

[0424] In some embodiments, referring to Fig.39 , the recess 511 accommodates at least a part of the bus bar 30. In this way, the occupation of the space in the accommodation cavity 50a for arranging the battery cell 20 by the bus bar 30 is reduced, which is beneficial to improving the space utilization rate.

[0425] It should be noted that Fig.39 is only an example of some embodiments. In some other embodiments, the recess 511 may not accommodate the bus bar 30 and the electrode lead-out portion 23 or other components in the battery 100 at the same time, and may only accommodate one of them.

[0426] An embodiment of the present invention further provides an electrical device, which includes the battery 100 in any one of the foregoing embodiments, and the battery 100 is used to provide electrical energy for the electrical device.

[0427] In this way, through the more compact and centralized arrangement of the electrode lead-out portion 23, it is beneficial to make the size of the battery 100 more compact, and further beneficial to make the size of the electrical device more compact.

[0428] An embodiment of the present invention further provides a vehicle 1000, referring to Figure 40 to Figure 41 , the vehicle 1000 includes a vehicle frame 400 and the battery 100 in any one of the foregoing embodiments. The battery 100 is installed on the vehicle frame 400. A convex portion 512 is formed on the outer surface of the first box wall 51 along the wall thickness direction corresponding to the region of the recess 511, and the convex portion 512 faces the vehicle frame 400.

[0429] The vehicle frame 400 is at least a part of the white body of the vehicle 1000, and an accommodation chamber 400a is provided in the vehicle frame 400.

[0430] The convex portion 512 faces the vehicle frame 400, that is to say, at least a part of the convex portion 512 is located in the space of the accommodation chamber 400a.

[0431] In this way, the convex portion 512 being located in the vehicle frame 400 is beneficial to improving the space utilization rate in the vehicle 1000 and is beneficial to increasing the capacity of the battery 100 that the vehicle 1000 can carry.

[0432] The accommodation chamber 400a can be a passenger compartment, a trunk, etc.

[0433] In some embodiments, reference may be made to Fig.41 , on the vehicle frame 400, there is a support beam 401, the support beam 401 has a slot 401a, and the convex portion 512 at least partially extends into the slot 401a.

[0434] The support beam 401 is used to support other structures in the vehicle 1000 and improve the overall structural stiffness of the vehicle frame 400.

[0435] In this way, the convex portion 512 can utilize the internal space of the support beam 401 to improve the utilization rate of the space inside the vehicle 1000, and the support beam 401 can also transfer the component load to the battery 100 to improve the structural stiffness of the whole vehicle.

[0436] The specific type of the support beam 401 is not limited. For example, it can be a door sill, a side beam of the vehicle, etc.

[0437] The embodiment of the present utility model also provides a battery cell 20. Refer to Figures 3 to 5 , the battery cell 20 is used for the battery 100, the battery cells 20 are configured in multiple numbers and arranged along the first direction F1 in the battery 100, and the battery further includes a bus bar 30;

[0438] The battery cell 20 includes a plurality of electrode lead-out portions 23, and the battery cell 20 is configured to connect the bus bar 30 to the electrode lead-out portions 23 of the battery cells 20 arranged adjacent to each other along the first direction F1;

[0439] In the projection plane perpendicular to the first direction F1, the projections of at least two electrode lead-out portions 23 located on the battery cell 20 at least partially overlap.

[0440] The structure of the battery cell 20 in the embodiment of the present utility model is beneficial to making the arrangement positions of the electrode lead-out portions 23 more concentrated and compact; when the battery cells 20 are arranged in groups and applied to the battery 100, a relatively regular space can be formed in the battery 100 for arranging other devices such as the bus bar 30 and the sampling component 40 in the battery 100, which is beneficial to improving the utilization rate of the space inside the battery 100, facilitating the neat arrangement of various devices inside the battery 100, and beneficial to improving the production and assembly efficiency of the battery 100. In addition, the arrangement of the bus bar 30 in the battery 100 can also be more concentrated, which is convenient for centralized protection of the connection area of the bus bar 30.

[0441] In some embodiments, reference may be made to Fig. 9 and Fig.10The battery cell 20 includes a first electrode lead-out portion 231, the first electrode lead-out portion 231 includes a first connection portion 2311 for connecting to the busbar 30, the battery cell 20 includes a first edge 21a and a second edge 21b opposite to each other along the first direction F1, and the maximum distance between the first connection portion 2311 and the first edge 21a is less than the maximum distance between the first connection portion 2311 and the second edge 21b. That is, the maximum distance between the first connection portion 2311 and the first edge 21a is D1, and the maximum distance between the first connection portion 2311 and the second edge 21b is D2, and D1<D2.

[0442] This helps to make the first electrode lead-out portion 231 closer to other battery cells 20 in the battery 100 along the first direction F1, and helps to further shorten the size of the busbar 30 required to electrically connect the first electrode lead-out portion 231 and the second electrode lead-out portion 232, thereby helping to further reduce the resistance of the busbar 30.

[0443] In some embodiments, please refer to Figure 20 to Figure 22 , Figure 20 to Figure 22 The first battery cell 21 further includes a third electrode lead-out portion 233. The first electrode lead-out portion 231 and the third electrode lead-out portion 233 are at least partially overlapped when projected along the first direction F1. The first electrode lead-out portion 231 and the third electrode lead-out portion 233 are asymmetric structures with respect to the center of the wall where they are located.

[0444] In this way, the first electrode lead-out portion 231 and the third electrode lead-out portion 233 can be an asymmetric structure on the wall where they are located, and do not need to be a symmetrical structure. The position setting of the electrode lead-out portion 23 can be more flexible. For example, multiple electrode lead-out portions 23 on the same battery cell 20 can be set biased to one side so as to form a larger area of ​​​​vacant area on the wall to arrange other devices in the battery 100.

[0445] In some embodiments, please refer to Figure 4 , Figure 5 , Fig.21 or Fig. 22 In any of the drawings, the first electrode lead portion 231 may be at least partially misaligned with the third electrode lead portion 233 projected along the first direction F1.

[0446] In this way, the creepage distance of the staggered portion of the first electrode lead-out portion 231 relative to the third electrode lead-out portion 233 is increased, and the creepage distance of the staggered portion of the third electrode lead-out portion 233 relative to the first electrode lead-out portion 231 is increased, which is beneficial for electrically connecting the devices in the battery 100 that have a larger creepage distance requirement to the staggered portion of the first electrode lead-out portion 231 and the staggered portion of the third electrode lead-out portion 233, respectively, to improve the safety of the use of the battery 100.

[0447] In some embodiments where the bus member 30 is connected to the first electrode lead portion 231 and the second electrode lead portion 232 along the second direction F2, and the third direction is perpendicular to the first direction F1 and the second direction F2 pairwise, referring to Fig.23 and Fig.24 , the first electrode lead portion 231 has a first end portion 2312 in the third direction F3. In a projection plane perpendicular to the first direction F1, the projection of the first end portion 2312 is misaligned with the projection of the third electrode lead portion 233. The third electrode lead portion 233 has a second end portion 2331 in the third direction F3. In a projection plane perpendicular to the first direction F1, the projection of the second end portion 2331 is misaligned with the projection of the first electrode lead portion 231.

[0448] Thus, it is further beneficial to increase the creepage distance between the first end portion 2312 and the second end portion 2331, beneficial to improve the utilization rate of the first wall surface 21c, and convenient to increase the total contour of the first electrode lead portion 231 and the total contour of the second electrode lead portion 232, so as to improve the convenience of electrically connecting the first electrode lead portion 231 and the second electrode lead portion 232 to other devices in the battery 100 and other devices in the battery cell 20 respectively.

[0449] In some embodiments, referring to Fig.24 , the first end portion 2312 protrudes towards the third electrode lead portion 233 along the first direction F1. Thus, it is beneficial to increase the size of the first end portion 2312 when the sizes of the first electrode lead portion 231 and the third electrode lead portion 233 along the first direction F1 are fixed, beneficial to increase the size of the connection area between the first end portion 2312 and the first inner connection member 25, improve the current-carrying capacity, and beneficial to make the arrangement of the first electrode lead portion 231 and the third electrode lead portion 233 more compact.

[0450] In some embodiments, continuing to refer to Fig.24 , the second end portion 2331 protrudes towards the first electrode lead portion 231 along the first direction F1.

[0451] Thus, it is beneficial to increase the size of the second end portion 2331 when the sizes of the first electrode lead portion 231 and the third electrode lead portion 233 along the first direction F1 are fixed, beneficial to increase the size of the connection area between the second end portion 2331 and the second inner connection member 26, improve the current-carrying capacity, beneficial to make the arrangement of the first electrode lead portion 231 and the third electrode lead portion 233 more compact. At the same time, it is beneficial to increase the total outer surface area of the first electrode lead portion 231 and the third electrode lead portion 233, beneficial to improve the heat generation situation of the first electrode lead portion 231 and the third electrode lead portion 233 during the current passing process, and enhance the use safety of the battery 100.

[0452] In some embodiments, referring to Figure 25 to Figure 29 , the battery cell 20 further includes a housing 24 and an electrode assembly 27. The housing 24 has a receiving space 24a. The housing 24 includes a first housing wall 241. The electrode assembly 27 is disposed in the receiving space 24a. The electrode lead-out portion 23 is disposed on the first housing wall 241. Along the wall thickness direction of the first housing wall 241, the electrode lead-out portion 23 includes a first electrode lead-out portion 231 and a third electrode lead-out portion 233. At least a part of the first electrode lead-out portion 231 is disposed between the third electrode lead-out portion 233 and the first housing wall 241, and the first electrode lead-out portion 231 abuts against the third electrode lead-out portion 233.

[0453] In this way, the first housing wall 241 and the third electrode lead-out portion 233 can directly limit the first electrode lead-out portion 231, which is beneficial to simplifying the related components for fixing the first electrode lead-out portion 231 on the battery cell 20 and reducing the number of components.

[0454] In some embodiments, referring to Fig.28 and Fig.29 , the third electrode lead-out portion 233 includes an electrode terminal 2332 and a first insulating member 2333. The electrode terminal 2332 is fixed to the first insulating member 2333. At least a part of the first electrode lead-out portion 231 is disposed between the first insulating member 2333 and the first housing wall 241, and the first insulating member 2333 abuts against the first electrode lead-out portion 231.

[0455] In this way, the first insulating member 2333 reduces the probability of direct electrical conduction between the third electrode lead-out portion 233 and the first electrode lead-out portion 231. At the same time, it also reduces the risk of short circuit caused by direct electrical conduction between the electrode terminal 2332 and the first housing wall 241, improving the use safety of the battery 100.

[0456] In some embodiments, referring to Fig.29 , the battery cell 20 further includes a second insulating member 28. The second insulating member 28 is at least partially located between the first electrode lead-out portion 231 and the first housing wall 241. That is to say, the second insulating member 28 separates the space between the first electrode lead-out portion 231 and the first housing wall 241.

[0457] In this way, the risk of short circuit caused by direct electrical conduction between the first electrode lead-out portion 231 and the first housing wall 241 is reduced, improving the use safety of the battery 100.

[0458] In some embodiments, the first insulating member 2333 and the second insulating member 28 are integrally formed. That is to say, the first insulating member 2333 and the second insulating member 28 are different parts of the same integral component.

[0459] In this way, it is convenient to integrally form the first insulating member 2333 and the second insulating member 28, which is beneficial to improving production efficiency; it is beneficial to simplify the assembly process and improve the production efficiency of the battery cell 20.

[0460] In some embodiments, referring to Figure 25 to Figure 29 , the first electrode lead-out portion 231 includes a first terminal plate 2314, at least a part of the first terminal plate 2314 is disposed on a side of the first housing wall 241 facing away from the accommodation space 24a, the electrode terminal 2332 includes a second terminal plate 2332a, the second terminal plate 2332a is disposed on a side of the first housing wall 241 facing away from the accommodation space 24a, and the first insulating member 2333 is fixed to the first terminal plate 2314;

[0461] Along the wall thickness direction of the first housing wall 241, the first terminal plate 2314, the first insulating member 2333 and the second terminal plate 2332a partially overlap, and the second terminal plate 2332a is partially disposed between the first insulating member 2333 and the first housing wall 241, and the first terminal plate 2314 abuts against the first insulating member 2333.

[0462] It can be understood that, since the first terminal plate 2314 and the first insulating member 2333 overlap along the wall thickness direction of the first housing wall 241, the first terminal plate 2314 abuts against the first insulating member 2333 at least along the wall thickness direction of the first housing wall 241.

[0463] In these embodiments, the first terminal plate 2314 and the second terminal plate 2332a are located outside the housing 24, so that both the first terminal plate 2314 and the second terminal plate 2332a are used for electrically connecting to other components in the battery 100 such as the bus bar 30.

[0464] In this way, the abutting portion between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 is located outside the accommodation space 24a, reducing the probability of interference between the abutting position of the first electrode lead-out portion 231 and the third electrode lead-out portion 233 and the positions where the electrode assembly 27 is electrically connected to the first electrode lead-out portion 231 and the third electrode lead-out portion 233 respectively.

[0465] In some embodiments, referring to Fig.25 and Fig.26 , the first electrode lead-out portion 231 further includes a first terminal disc 2315, at least a part of the first terminal disc 2315 is disposed on a side of the first housing wall 241 facing the accommodation space 24a, the electrode terminal 2332 further includes a second terminal disc 2332b, and the second terminal disc 2332b is disposed on a side of the first housing wall 241 facing the accommodation space 24a;

[0466] Along the wall thickness direction of the first housing wall 241, the first terminal plate 2315 is at least partially disposed between the second terminal plate 2332b and the first housing wall 241; alternatively, along the wall thickness direction of the first housing wall 241, the second terminal plate 2332b is at least partially disposed between the first terminal plate 2315 and the first housing wall 241.

[0467] In these embodiments, the first terminal plate 2315 and the second terminal plate 2332b are located inside the housing 24 such that both the first terminal plate 2315 and the second terminal plate 2332b are used for electrically connecting with the electrode assembly 27.

[0468] The first terminal plate 2315 is at least partially disposed between the second terminal plate 2332b and the first housing wall 241, which may be that a part of the first terminal plate 2315 is restricted by the second terminal plate 2332b and the first housing wall 241 along the wall thickness direction of the first housing wall 241.

[0469] The second terminal plate 2332b is at least partially disposed between the first terminal plate 2315 and the first housing wall 241, which may be that a part of the second terminal plate 2332b is restricted by the first terminal plate 2315 and the first housing wall 241 along the wall thickness direction of the first housing wall 241.

[0470] In this way, through the first terminal plate 2315, the second terminal plate 2332b, and the first housing wall 241, it is possible to further limit the first electrode lead-out portion 231 or the third electrode lead-out portion 233 along the wall thickness direction of the first housing wall 241.

[0471] It can be understood that at least two through holes communicating with the accommodation space 24a are provided on the first housing wall 241, one through hole for the first electrode lead-out portion 231 to pass through, and the other through hole for the second electrode lead-out portion 232 to pass through.

[0472] It can be understood that in the projection plane perpendicular to the second direction F2, the projection of the through hole through which the first electrode lead-out portion 231 passes is at least partially within the projection range of the first terminal plate 2314 and within the projection range of the first terminal plate 2315.

[0473] In the projection plane perpendicular to the second direction F2, the projection of the through hole through which the first electrode lead-out portion 231 passes is at least partially within the projection range of the first terminal plate 2314 and within the projection range of the first terminal plate 2315.

[0474] In some embodiments, refer to Fig.29, the third electrode lead-out portion 233 is provided with a first protruding portion 233a, the first electrode lead-out portion 231 is provided with a first recessed portion 231a, the first protruding portion 233a and the first recessed portion 231a overlap at least partially along the wall thickness direction of the first housing wall 241, and the first protruding portion 233a and the first recessed portion 231a cooperate with each other.

[0475] The first recessed portion 231a can form one or more recessed spaces for accommodating at least part of the first protruding portion 233a, and the inner wall of the recessed space formed by the first recessed portion 231a abuts against the first protruding portion 233a.

[0476] In this way, along the wall thickness direction of the first housing wall 241, the first protruding portion 233a and the second protruding portion 231d achieve the purpose of abutting the first electrode lead-out portion 231 and the third electrode lead-out portion 233.

[0477] In some embodiments, the first recessed portion 231a includes a first stepped portion 231b and a second stepped portion 231c, and the second stepped portion 231c is disposed on a side of the first stepped portion 231b away from the third electrode lead-out portion 233;

[0478] The first protruding portion 233a includes a first protruding portion 2332c provided on the electrode terminal 2332. Along the wall thickness direction of the first housing wall 241, a part of the first electrode lead-out portion 231 is located between the first protruding portion 2332c and the first housing wall 241, and the first protruding portion 2332c is at least partially accommodated in the stepped space formed by the first stepped portion 231b;

[0479] The first protruding portion 233a further includes a first covering portion 2333a provided on the first insulating member 2333. Along the wall thickness direction of the first housing wall 241, a part of the first electrode lead-out portion 231 is located between the first covering portion 2333a and the first housing wall 241, and the first covering portion 2333a is at least partially accommodated in the stepped space formed by the second stepped portion 231c.

[0480] Refer to Fig.29 , the first stepped portion 231b refers to the part of the first electrode lead-out portion 231 within the dashed box indicated by the label 231b in the figure; the second stepped portion 231c refers to the part of the first electrode lead-out portion 231 within the dashed box indicated by the label 231c in the figure.

[0481] The stepped space formed by the first stepped portion 231b refers to the space surrounded by the physical structure of the first stepped portion 231b.

[0482] It can be understood that the step space formed by the first step portion 231 b can limit the first extension portion 2332 c along the thickness direction of the first shell wall 241 and perpendicular to the thickness direction of the first shell wall 241 .

[0483] The step space formed by the second step portion 231 c refers to the space surrounded by the physical structure of the second step portion 231 c.

[0484] It can be understood that the step space formed by the second step portion 231 c can limit the first covering portion 2333 a along the thickness direction of the first shell wall 241 and perpendicular to the thickness direction of the first shell wall 241 .

[0485] The first covering portion 2333a can separate the first protruding portion 2332c and the first recessed portion 231a perpendicularly to the thickness direction of the first shell wall 241, so as to facilitate increasing the distance between the surface of the first protruding portion 2332c that is away from the first shell wall 241 along the thickness direction of the first shell wall 241 and the surface of the first electrode lead-out portion 231 that is away from the first shell wall 241 along the thickness direction of the first shell wall 241.

[0486] In this way, the first step portion 231b and the second step portion 231c are conducive to achieving the limiting effect between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 along the wall thickness direction of the first shell wall 241 and perpendicular to the wall thickness direction of the first shell wall 241; it is conducive to increasing the creepage distance between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 through the first covering portion 2333a, reducing the probability of short circuit between the first electrode lead-out portion 231 and the third electrode lead-out portion 233 due to foreign matter, and improving the safety of battery 100.

[0487] In some embodiments, see Fig.29 , the first extension portion 2332c is a portion of the second terminal plate 2332a.

[0488] In some embodiments, see Fig.29 A portion of the first covering portion 2333a is located in the step space formed by the first step portion 231b, so as to separate the first protruding portion 233a and the first recessed portion 231a.

[0489] In some embodiments, along the wall thickness direction of the first shell wall 241, the height difference between the surface of the first terminal plate 2314 on the side facing away from the first shell wall 241 and the surface of the second terminal plate 2332a on the side facing away from the first shell wall 241 is greater than or equal to 0 and does not exceed 0.5 mm.

[0490] Thus, it is beneficial to reduce the probability that the first electrode lead-out portion 231 and the second electrode lead-out portion 232 interfere with other devices electrically connected to each other on the other.

[0491] In some embodiments, referring to Fig. 27 and Fig.28 , the first terminal plate 2314 includes a first main body portion 2314a and a first extension portion 2314b connected to each other, and the second terminal plate 2332a includes a second main body portion 2332e and a second extension portion 2332f connected to each other. Along the length direction of the first housing wall 241, the first extension portion 2314b and the second extension portion 2332f are located between the first main body portion 2314a and the second main body portion 2332e, and the first extension portion 2314b and the second extension portion 2332f are arranged in length along the width direction of the first housing wall 241.

[0492] Thus, through the first extension portion 2314b and the second extension portion 2332f, it is convenient to realize the electrical connection with the bus bar 30, which is beneficial to utilize the characteristic that there is a large amount of space in the length direction of the first housing wall 241 to increase the contact area between the first extension portion 2314b and the second extension portion 2332f and the bus bar 30 respectively; the two are arranged along the width direction of the first housing wall 241, which is beneficial to make the arrangement of the first extension portion 2314b and the second extension portion 2332f more concentrated, and realize the electrical connection with other devices in the battery 100 such as the sampling assembly 40 through the first main body portion 2314a and the second main body portion 2332e, reducing the probability of interference when the first terminal plate 2314 and the second terminal plate 2332a are electrically connected to other devices respectively.

[0493] In some embodiments, referring to Fig.25 and Fig.26 , the first electrode lead-out portion 231 further includes a first terminal disk 2315, at least a part of the first terminal disk 2315 is arranged on the side of the first housing wall 241 facing the accommodation space, the electrode terminal 2332 further includes a second terminal disk 2332b, the second terminal disk 2332b is arranged on the side of the first housing wall 241 facing the accommodation space 24a, and the first main body portion 2314a and the first terminal disk 2315 are directly connected through a first connecting column 2316; the second main body portion 2332e and the second terminal disk 2332b are directly connected through a second connecting column 2332g.

[0494] Thus, the electrical connection between the first terminal plate 2314 and the first terminal disk 2315 is realized, and the electrical connection between the second terminal plate 2332a and the second terminal disk 2332b is realized, which is beneficial to reduce the through holes on the housing 24 for respectively passing through the first electrode lead-out portion 231 and the third electrode lead-out portion 233.

[0495] In some embodiments, referring to Figure 27 to Figure 29, the first concave portion 231a is disposed on a side of the first extension portion 2314b facing the electrode terminal 2332, and the first convex portion 233a is disposed on a side of the second main body portion 2332e facing the first electrode lead portion 231.

[0496] In this way, the second main body portion 2332e realizes the limiting and constraining effects on the first extension portion 2314b in the thickness direction of the first housing wall 241, reducing the probability that problems such as warping of the first extension portion 2314b affect its normal function.

[0497] In some embodiments, referring to Fig. 27 , Fig.30 and Fig.31 , the electrode terminal 2332 is further provided with a second concave portion 2332d. A part of the first electrode lead portion 231 forms at least part of the second convex portion 231d. The second convex portion 231d and the second concave portion 2332d overlap at least partially in the wall thickness direction of the first housing wall 241, and the second convex portion 231d and the second concave portion 2332d cooperate with each other;

[0498] The second concave portion 2332d is disposed on a side of the second extension portion 2332f facing the first electrode lead portion 231, and the second convex portion 231d is disposed on a side of the first main body portion 2314a facing the electrode terminal 2332.

[0499] The first concave portion 231a of the first electrode lead portion 231 is located between the first convex portion 233a of the third electrode lead portion 233 and the first housing wall 241, and the second concave portion 2332d of the third electrode lead portion 233 is located between the second convex portion 231d of the first electrode lead portion 231 and the first housing wall 241, thereby realizing the interlocking between the first electrode lead portion 231 and the third electrode lead portion 233.

[0500] In this way, the probability that problems such as warping of the second extension portion 2332f affect its normal function is reduced. On the basis of realizing the limiting of the second extension portion 2332f, the first electrode lead portion 231 and the third electrode lead portion 233 are further limited to each other, which is more conducive to fixing their relative positions.

[0501] In some embodiments, referring to Fig.31 , the second concave portion 2332d includes a third step portion 2332h and a fourth step portion 2332j. The fourth step portion 2332j is disposed on a side of the third step portion 2332h away from the first electrode lead portion 231;

[0502] The second protruding portion 231d includes a second protruding portion 231e provided on the first electrode lead portion 231. Along the wall thickness direction of the first housing wall 241, a part of the electrode terminal 2332 is located between the second protruding portion 231e and the first housing wall 241, and the second protruding portion 231e is at least partially received in the stepped space formed by the third stepped portion 2332h;

[0503] The battery cell 20 further includes a second insulating member 28. The second insulating member 28 is at least partially located between the first electrode lead portion 231 and the first housing wall 241. The second protruding portion 231d further includes a second covering portion 28a provided on the second insulating member 28. Along the wall thickness direction of the first housing wall 241, a part of the electrode terminal 2332 is located between the second covering portion 28a and the first housing wall 241, and the second covering portion 28a is at least partially received in the stepped space formed by the fourth stepped portion 2332j.

[0504] The third stepped portion 2332h refers to the part of the third electrode lead portion 233 within the dashed box indicated by the reference numeral 2332h in the figure; the fourth stepped portion 2332j refers to the part of the third electrode lead portion 233 within the dashed box indicated by the reference numeral 2332j in the figure.

[0505] The stepped space formed by the third stepped portion 2332h refers to the space enclosed by the solid structure of the third stepped portion 2332h.

[0506] It can be understood that through the stepped space formed by the third stepped portion 2332h, the second protruding portion 231e can be limited in the thickness direction of the first housing wall 241 and in the direction perpendicular to the thickness direction of the first housing wall 241.

[0507] The stepped space formed by the fourth stepped portion 2332j refers to the space enclosed by the solid structure of the fourth stepped portion 2332j.

[0508] It can be understood that through the stepped space formed by the fourth stepped portion 2332j, the second covering portion 28a can be limited in the thickness direction of the first housing wall 241 and in the direction perpendicular to the thickness direction of the first housing wall 241.

[0509] Thus, the third step portion 2332h and the fourth step portion 2332j are conducive to achieving the limiting effect between the first electrode lead portion 231 and the third electrode lead portion 233 along the wall thickness direction of the first housing wall 241 and perpendicular to the wall thickness direction of the first housing wall 241, which is further conducive to improving the interlocking stability between the first electrode lead portion 231 and the third electrode lead portion 233; it is conducive to increasing the creepage distance between the first electrode lead portion 231 and the third electrode lead portion 233 through the second covering portion 28a, reducing the probability of short circuit between the first electrode lead portion 231 and the third electrode lead portion 233 caused by foreign objects, and improving the use safety of the battery 100.

[0510] In some embodiments, referring to Fig.33 , the bus bar 30 is used to be connected to the electrode lead portion 23 along the second direction F2, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2 in pairs; the electrode lead portion 23 is located on the first wall surface 21c of the battery cell 20, and the first wall surface 21c includes a first boundary 21d and a second boundary 21e that are opposed to each other along the third direction F3, and the minimum distance between the electrode lead portion 23 and the first boundary 21d is less than the minimum distance between the electrode lead portion 23 and the second boundary 21e. That is to say, the minimum distance between the electrode lead portion 23 and the first boundary 21d is L5, the minimum distance between the electrode lead portion 23 and the second boundary 21e is L6, and L5 < L6.

[0511] Thus, it is conducive to making the range of the area where the first wall surface 21c is located closer to the second boundary 21e along the third direction F3 of the electrode lead portion 23 larger, which is convenient for arranging other devices in the battery 100 in this area.

[0512] In some embodiments, referring to Fig.33 , the bus bar 30 is connected to the electrode lead portion 23 along the second direction F2, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2 in pairs;

[0513] All the electrode lead portions 23 on the same battery cell 20 are located on the same wall surface. On the same battery cell 20, the distance between the two farthest points of adjacent two electrode lead portions 23 along the third direction F3 is less than or equal to one-half of the maximum dimension of the wall surface along the third direction F3. That is to say, on the same battery cell 20, the distance between the two farthest points of adjacent two electrode lead portions 23 along the third direction F3 is L7, and the maximum dimension of the wall surface along the third direction F3 is L8, and L7 ≤ L8.

[0514] Thus, on one wall surface, the respective electrode lead portions 23 are centrally arranged. As a result, through the mutual cooperation of the respective electrode lead portions 23, the strength of the area provided with the electrode lead portions 23 in this wall surface and even the entire wall surface can be improved, which is beneficial to reducing the risk of deformation of the wall surface and enhancing the use safety of the battery cell 20. In addition, it is beneficial to make full use of other areas of this wall surface and other respective wall surfaces, and it is also beneficial to centrally process the electrode lead portions 23 and other devices in the attached battery 100 during processing and maintenance.

[0515] The various embodiments / implementations provided by the present utility model can be combined with each other without conflict.

[0516] The above are only the preferred embodiments of the present utility model and are not used to limit the embodiments in the present utility model. For those skilled in the art, the embodiments of the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present utility model shall be included in the protection scope of the embodiments of the present utility model.

Claims

1. A battery, characterized in that: The battery comprises: A battery cell group, comprising a plurality of battery cells arranged along a first direction, wherein the battery cells include a plurality of electrode lead-out portions; A busbar connected to the electrode lead-out portions of the battery cells arranged adjacent to each other along the first direction; In a projection plane perpendicular to the first direction, projections of at least two electrode lead-out portions located on the same battery cell at least partially overlap.

2. The battery according to claim 1, characterized in that In a projection plane perpendicular to the first direction, projections of the electrode lead-out portions respectively located on two adjacent battery cells along the first direction at least partially overlap.

3. The battery according to claim 2, characterized in that The battery cell group includes a first battery cell and a second battery cell adjacent to each other along the first direction, the electrode lead-out portion includes a first electrode lead-out portion located on the first battery cell and a second electrode lead-out portion located on the second battery cell, and in a projection plane perpendicular to the first direction, projections of the first electrode lead-out portion and the second electrode lead-out portion along the first direction at least partially overlap with each other; The bus bar extends along the first direction to connect portions of the first electrode lead portion and the second electrode lead portion that overlap in projection along the first direction.

4. The battery according to claim 3, characterized in that The first battery cell comprises a first edge and a second edge opposite to each other along the first direction, the first edge is closer to the second battery cell than the second edge, and a maximum distance between the first electrode lead-out portion and the first edge is smaller than a maximum distance between the first electrode lead-out portion and the second edge; And / or, the second battery cell includes a third edge and a fourth edge opposite to each other along the first direction, the third edge is closer to the first battery cell than the fourth edge, and the maximum distance between the second electrode lead-out portion and the third edge is smaller than the maximum distance between the second electrode lead-out portion and the fourth edge.

5. The battery according to claim 3, characterized in that The first electrode lead-out portion includes a first connection portion connected to the bus bar; The first battery cell includes a first edge and a second edge opposite to each other along the first direction, the first edge is closer to the second battery cell than the second edge, and a maximum distance between the first connection portion and the first edge is smaller than a maximum distance between the first connection portion and the second edge.

6. The battery according to claim 5, characterized in that The maximum distance between the first connection portion and the first edge is D1, the maximum distance between the first connection portion and the second edge is D2, and D1 and D2 satisfy: D2≥2*D1, D1≥3mm.

7. The battery according to claim 5, characterized in that The maximum dimension of the first battery cell along the first direction is D, the maximum distance between the first connection portion and the first edge is D1, the maximum distance between the first connection portion and the second edge is D2, and D, D1 and D2 satisfy: D1≥3mm, D2≥0.5*D+3mm.

8. The battery according to claim 3, characterized in that In a projection plane perpendicular to the first direction, projections of the first electrode lead portion and the second electrode lead portion along the first direction are at least partially offset from each other.

9. The battery according to claim 8, characterized in that The busbar is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; The size of the portion of the first electrode lead-out portion that overlaps with the projection of the second electrode lead-out portion along the first direction along the third direction is L1, and the size of the portion of the first electrode lead-out portion that is misaligned with the projection of the second electrode lead-out portion along the first direction along the third direction is L2, and L1≥L2.

10. The battery according to claim 9, characterized in that L1≥2*L2.

11. The battery according to claim 3, characterized in that The busbar is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; A dimension of the first electrode lead-out portion along the third direction is greater than a dimension of the first electrode lead-out portion along the first direction.

12. The battery according to claim 11, characterized in that A dimension of the first electrode lead-out portion along the third direction is greater than or equal to twice a dimension of the first electrode lead-out portion along the first direction.

13. The battery according to claim 3, characterized in that The busbar is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the second direction is perpendicular to the first direction; The cross-section of the portion of the busbar that overlaps with the projection of the first electrode lead-out portion along the second direction that is perpendicular to the first direction is a first cross-section, the cross-section of the portion of the busbar that is located between the first electrode lead-out portion and the second electrode lead-out portion that is perpendicular to the first direction is a second cross-section, and the minimum thickness of the first cross-section along the second direction is smaller than the minimum thickness of the second cross-section along the second direction.

14. The battery according to claim 3, characterized in that The busbar is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the second direction is perpendicular to the first direction; The busbar comprises a plurality of sub-busbars stacked and interconnected along the second direction, two adjacent layers of the sub-busbars along the second direction are connected at one end in a third direction, and the third direction is perpendicular to the first direction and the second direction.

15. The battery according to claim 14, characterized in that The layer of the multi-layer sub-bus sheets closest to the first electrode lead-out portion is connected to the first electrode lead-out portion, and the other layers of the multi-layer sub-bus sheets are provided with through holes or through grooves penetrating along the second direction in the area where the projections overlap with the first electrode lead-out portion along the second direction.

16. The battery according to claim 3, characterized in that The first battery cell further includes a third electrode lead-out portion. In a projection plane perpendicular to the first direction, the first electrode lead-out portion and the third electrode lead-out portion at least partially overlap when projected along the first direction.

17. The battery according to claim 16, characterized in that The second battery cell further includes a fourth electrode lead-out portion, and in a projection plane perpendicular to the first direction, projections of the second electrode lead-out portion and the fourth electrode lead-out portion along the first direction at least partially overlap; The first electrode lead-out portion and the third electrode lead-out portion are both located on a first wall surface of the first battery cell, the second electrode lead-out portion and the fourth electrode lead-out portion are both located on a second wall surface of the second battery cell, and the first wall surface and the second wall surface are oriented in the same direction; The relative positions of the second electrode lead-out portion and the fourth electrode lead-out portion on the second wall surface are the same as the relative positions of the first electrode lead-out portion and the third electrode lead-out portion on the first wall surface.

18. The battery according to claim 16, characterized in that In a projection plane perpendicular to the first direction, projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction are at least partially misaligned.

19. The battery according to claim 18, characterized in that The busbar is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; The first electrode lead portion has a first end portion in the third direction, and in a projection plane perpendicular to the first direction, a projection of the first end portion is offset from a projection of the third electrode lead portion; the third electrode lead portion has a second end portion in the third direction, and in a projection plane perpendicular to the first direction, a projection of the second end portion is offset from a projection of the first electrode lead portion; The first battery cell further includes a shell, a first inner connector and a second inner connector. The first inner connector is located in the shell and connected to the first end. The second inner connector is located in the shell and connected to the second end.

20. The battery according to claim 19, characterized in that The first end portion protrudes toward the third electrode lead-out portion along the first direction, and / or the second end portion protrudes toward the first electrode lead-out portion along the first direction.

21. The battery according to claim 1, characterized in that The battery cell further comprises a housing and an electrode assembly, wherein the housing has a receiving space, the housing comprises a first housing wall, and at least a portion of the electrode assembly is disposed in the receiving space; The electrode lead-out portion is arranged on the first shell wall along the wall thickness direction of the first shell wall, and the electrode lead-out portion includes a first electrode lead-out portion and a third electrode lead-out portion. At least a portion of the first electrode lead-out portion is arranged between the third electrode lead-out portion and the first shell wall, and the first electrode lead-out portion is abutted against the third electrode lead-out portion.

22. The battery according to claim 21, characterized in that The third electrode lead-out portion includes an electrode terminal and a first insulating member, the electrode terminal is fixed to the first insulating member, the first electrode lead-out portion is at least partially disposed between the first insulating member and the first shell wall, and the first insulating member abuts against the first electrode lead-out portion.

23. The battery according to claim 22, characterized in that The battery cell further includes a second insulating member, which is at least partially located between the first electrode lead-out portion and the first housing wall.

24. The battery according to claim 23, characterized in that The first insulating member and the second insulating member are integrally formed.

25. The battery according to claim 22, characterized in that The first electrode lead-out portion comprises a first terminal plate, at least a portion of which is disposed on a side of the first housing wall away from the accommodation space, the electrode terminal comprises a second terminal plate, which is disposed on a side of the first housing wall away from the accommodation space, and the first insulating member is fixed to the first terminal plate; Along the wall thickness direction of the first shell wall, the first terminal plate, the first insulating member and the second terminal plate partially overlap, and the second terminal plate is partially arranged between the first insulating member and the first shell wall, and the first terminal plate abuts against the first insulating member.

26. The battery according to claim 25, characterized in that The first electrode lead-out portion further includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the electrode terminal further includes a second terminal plate, which is disposed on a side of the first housing wall facing the accommodation space; Along the wall thickness direction of the first housing wall, the first terminal plate is at least partially arranged between the second terminal plate and the first housing wall; or, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially arranged between the first terminal plate and the first housing wall.

27. The battery according to claim 25, characterized in that The third electrode lead-out portion is provided with a first protrusion, and the first electrode lead-out portion is provided with a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first shell wall, and the first protrusion and the first recess cooperate with each other.

28. The battery according to claim 27, characterized in that The first recessed portion includes a first step portion and a second step portion, and the second step portion is arranged on a side of the first step portion away from the third electrode lead-out portion; The first protrusion includes a first extension provided on the electrode terminal, and along the wall thickness direction of the first shell wall, a part of the first electrode lead-out portion is located between the first extension and the first shell wall, and the first extension is at least partially accommodated in a step space formed by the first step portion; The first protrusion also includes a first covering portion provided by the first insulating member. Along the wall thickness direction of the first shell wall, a portion of the first electrode lead-out portion is located between the first covering portion and the first shell wall, and the first covering portion is at least partially accommodated in a step space formed by the second step portion.

29. The battery according to claim 25, characterized in that Along the wall thickness direction of the first shell wall, the height difference between the surface of the first terminal plate facing away from the shell wall and the surface of the second terminal plate facing away from the first shell wall is greater than or equal to 0 and does not exceed 0.5 mm.

30. The battery according to claim 27, characterized in that The first terminal plate includes a first main body and a first extension portion connected to each other, and the second terminal plate includes a second main body and a second extension portion connected to each other. Along the length direction of the first shell wall, the first extension portion and the second extension portion are located between the first main body and the second main body, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

31. The battery according to claim 30, characterized in that The first electrode lead-out portion further includes a first terminal plate, which is disposed on a side of the first housing wall facing the accommodation space, and the electrode terminal further includes a second terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the first main body portion and the first terminal plate are directly connected via a first connecting column; The second main body and the second terminal plate are directly connected via a second connecting column.

32. The battery according to claim 30, characterized in that The first recessed portion is disposed on a side of the first extending portion facing the electrode terminal, and the first protruding portion is disposed on a side of the second main body portion facing the first electrode lead-out portion.

33. The battery according to claim 30, characterized in that The electrode terminal is further provided with a second recessed portion, a portion of the first electrode lead-out portion forms at least a portion of a second protruding portion, the second protruding portion and the second recessed portion at least partially overlap along the wall thickness direction of the first housing wall, and the second protruding portion and the second recessed portion cooperate with each other; The second recessed portion is disposed on a side of the second extending portion facing the first electrode lead-out portion, and the second protruding portion is disposed on a side of the first main body portion facing the electrode terminal.

34. The battery according to claim 33, characterized in that The second recessed portion includes a third step portion and a fourth step portion, and the fourth step portion is arranged on a side of the third step portion away from the first electrode lead-out portion; The second protrusion includes a second extension portion provided on the first electrode lead-out portion, a portion of the electrode terminal is located between the second extension portion and the first shell wall along the wall thickness direction of the first shell wall, and the second extension portion is at least partially accommodated in a step space formed by the third step portion; The battery cell also includes a second insulating member, which is at least partially located between the first electrode lead-out portion and the first shell wall. The second protrusion also includes a second covering portion provided by the second insulating member. Along the wall thickness direction of the first shell wall, a portion of the electrode terminal is located between the second covering portion and the first shell wall, and the second covering portion is at least partially accommodated in a step space formed by the fourth step portion.

35. The battery according to claim 31, characterized in that The second extension portion is connected to the second terminal plate through a third connecting column, the first recessed portion is arranged on a side of the first extension portion facing the electrode terminal, and the first protruding portion is arranged on a side of the second extension portion facing the first electrode lead-out portion.

36. The battery according to claim 1, characterized in that The busbar is connected to the electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; The electrode lead portion is located on a first wall surface of the battery cell, the first wall surface includes a first boundary and a second boundary opposite to each other along the third direction, and a minimum distance between the electrode lead portion and the first boundary is smaller than a minimum distance between the electrode lead portion and the second boundary.

37. The battery according to claim 1, characterized in that The busbar is connected to the electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; All the electrode lead-out portions on the same battery cell are located on the same wall surface. On the same battery cell, the distance between the two most distant points of two adjacent electrode lead-out portions along the third direction is less than or equal to half of the maximum dimension of the wall surface along the third direction.

38. The battery according to claim 37, characterized in that The battery further comprises a sampling assembly, the sampling assembly is electrically connected to the battery cell, and the sampling assembly is located on the same side of all electrode lead-out portions along the third direction.

39. The battery according to claim 38, characterized in that The sampling component and the electrode lead-out portion are both located on the first wall surface of the battery cell.

40. The battery according to claim 39, characterized in that The first wall surface includes a first boundary and a second boundary opposite to each other along the third direction, a minimum distance between the electrode lead-out portion and the first boundary is smaller than a minimum distance between the electrode lead-out portion and the second boundary, and the sampling component is at least partially located between the electrode lead-out portion and the second boundary.

41. The battery according to claim 3, characterized in that The battery further includes a sampling assembly, the current collector is connected to the first electrode lead-out portion and the second electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; The first electrode lead-out portion includes a first connection portion and a second connection portion at different positions, the first connection portion is connected to the busbar, the second connection portion is connected to the sampling assembly, and the minimum dimension of the first connection portion along the third direction is greater than the minimum dimension of the second connection portion along the third direction.

42. The battery according to claim 41, characterized in that The second connection portion is located on one end of the first electrode lead-out portion along the third direction close to the sampling assembly for connecting the sampling assembly, and the first connection portion is located on the other end of the first electrode lead-out portion.

43. The battery according to claim 1, characterized in that The projections of the current collectors adjacent to each other along the first direction on the same battery cell group overlap each other along the first direction.

44. The battery according to any one of claims 1 to 43, characterized in that The battery comprises a box body, the box body comprises a receiving cavity and a first box wall, the first box wall is used to close the receiving cavity, at least a portion of the inner surface of the first box wall protrudes toward the outer surface to form a recess on the inner surface, The recess accommodates at least a portion of the electrode lead-out portion; and / or the recess accommodates at least a portion of the current busbar.

45. An electrical device, characterized in that: The electrical device comprises a battery as claimed in any one of claims 1 to 44, and the battery is used to provide electrical energy for the electrical device.

46. ​​A vehicle, characterized in that: The vehicle includes a frame and a battery as described in any one of claims 44, wherein the battery is mounted on the frame, and a convex portion is formed on the outer surface of the first box wall in an area corresponding to the concave portion along the wall thickness direction, and the convex portion faces the frame.

47. The vehicle according to claim 46, characterized in that The frame is provided with a support beam, the support beam has a slot, and the protrusion at least partially extends into the slot.

48. A battery cell, characterized in that: The battery cell is used in a battery, the battery cell is configured as a plurality of cells in the battery and arranged along a first direction, the battery further includes a busbar, The battery cell includes a plurality of electrode lead-out portions, and the battery cell is configured so that the busbar is connected to the electrode lead-out portions of the battery cells adjacently arranged along the first direction; In a projection plane perpendicular to the first direction, projections of at least two electrode lead-out portions on the battery cell at least partially overlap.

49. The battery cell according to claim 48, characterized in that The battery cell includes a first electrode lead-out portion, the first electrode lead-out portion includes a first connection portion for connecting to the busbar, the battery cell also includes a first edge and a second edge opposite to each other along the first direction, and a maximum distance between the first connection portion and the first edge is smaller than a maximum distance between the first connection portion and the second edge.

50. The battery cell according to claim 49, characterized in that The battery cell also includes a third electrode lead-out portion. In a projection plane perpendicular to the first direction, the first electrode lead-out portion and the third electrode lead-out portion at least partially overlap along the first direction, and the first electrode lead-out portion and the third electrode lead-out portion are asymmetric structures about the center of the wall surface.

51. The battery cell according to claim 50, characterized in that In a projection plane perpendicular to the first direction, projections of the first electrode lead-out portion and the third electrode lead-out portion along the first direction are at least partially misaligned.

52. The battery cell according to claim 51, characterized in that The busbar is used to be connected to the first electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; The first electrode lead portion has a first end portion in the third direction, and in a projection plane perpendicular to the first direction, a projection of the first end portion is offset from a projection of the third electrode lead portion; the third electrode lead portion has a second end portion in the third direction, and in a projection plane perpendicular to the first direction, a projection of the second end portion is offset from a projection of the first electrode lead portion; The battery cell further includes a shell, a first inner connector and a second inner connector. The first inner connector is located in the shell and connected to the first end. The second inner connector is located in the shell and connected to the second end.

53. The battery cell according to claim 52, characterized in that The first end portion protrudes toward the third electrode lead-out portion along the first direction, and / or the second end portion protrudes toward the first electrode lead-out portion along the first direction.

54. The battery cell according to claim 48, characterized in that The battery cell further comprises a housing and an electrode assembly, wherein the housing has a receiving space, the housing comprises a first housing wall, and at least a portion of the electrode assembly is disposed in the receiving space; The electrode lead-out portion is arranged on the first shell wall along the wall thickness direction of the first shell wall, and the electrode lead-out portion includes a first electrode lead-out portion and a third electrode lead-out portion. At least a portion of the first electrode lead-out portion is arranged between the third electrode lead-out portion and the first shell wall, and the first electrode lead-out portion is abutted against the third electrode lead-out portion.

55. The battery cell according to claim 54, characterized in that The third electrode lead-out portion includes an electrode terminal and a first insulating member, the electrode terminal is fixed to the first insulating member, the first electrode lead-out portion is at least partially disposed between the first insulating member and the first shell wall, and the first insulating member abuts against the first electrode lead-out portion.

56. The battery cell according to claim 55, characterized in that The battery cell further includes a second insulating member, which is at least partially located between the first electrode lead-out portion and the first housing wall.

57. The battery cell according to claim 56, characterized in that The first insulating member and the second insulating member are integrally formed.

58. The battery cell according to claim 55, characterized in that The first electrode lead-out portion comprises a first terminal plate, at least a portion of which is disposed on a side of the first housing wall away from the accommodation space, the electrode terminal comprises a second terminal plate, which is disposed on a side of the first housing wall away from the accommodation space, and the first insulating member is fixed to the first terminal plate; Along the wall thickness direction of the first shell wall, the first terminal plate, the first insulating member and the second terminal plate partially overlap, and the second terminal plate is partially arranged between the first insulating member and the first shell wall, and the first terminal plate abuts against the first insulating member.

59. The battery cell according to claim 58, characterized in that The first electrode lead-out portion further includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, and the electrode terminal further includes a second terminal plate, which is disposed on a side of the first housing wall facing the accommodation space. Along the wall thickness direction of the first housing wall, the first terminal plate is at least partially arranged between the second terminal plate and the first housing wall; or, Along the wall thickness direction of the first housing wall, the second terminal plate is at least partially arranged between the first terminal plate and the first housing wall.

60. The battery cell according to claim 58, characterized in that The third electrode lead-out portion is provided with a first protrusion, and the first electrode lead-out portion is provided with a first recess. The first protrusion and the first recess at least partially overlap along the wall thickness direction of the first shell wall, and the first protrusion and the first recess cooperate with each other.

61. The battery cell according to claim 60, characterized in that The first recessed portion includes a first step portion and a second step portion, and the second step portion is arranged on a side of the first step portion away from the third electrode lead-out portion; The first protrusion includes a first extension provided on the electrode terminal, and along the wall thickness direction of the first shell wall, a part of the first electrode lead-out portion is located between the first extension and the first shell wall, and the first extension is at least partially accommodated in a step space formed by the first step portion; The first protrusion also includes a first covering portion provided by the first insulating member. Along the wall thickness direction of the first shell wall, a portion of the first electrode lead-out portion is located between the first covering portion and the first shell wall, and the first covering portion is at least partially accommodated in a step space formed by the second step portion.

62. The battery cell according to claim 58, characterized in that Along the wall thickness direction of the first shell wall, the height difference between the surface of the first terminal plate facing away from the shell wall and the surface of the second terminal plate facing away from the first shell wall is greater than or equal to 0 and does not exceed 0.5 mm.

63. The battery cell according to claim 60, characterized in that The first terminal plate includes a first main body and a first extension portion connected to each other, and the second terminal plate includes a second main body and a second extension portion connected to each other. Along the length direction of the first shell wall, the first extension portion and the second extension portion are located between the first main body and the second main body, and the first extension portion and the second extension portion are arranged along the width direction of the first shell wall.

64. The battery cell according to claim 63, characterized in that The first electrode lead-out portion further includes a first terminal plate, at least a portion of which is disposed on a side of the first housing wall facing the accommodation space, the electrode terminal further includes a second terminal plate, which is disposed on a side of the first housing wall facing the accommodation space, and the first main body portion and the first terminal plate are directly connected via a first connecting column; The second main body and the second terminal plate are directly connected via a second connecting column.

65. The battery cell according to claim 64, characterized in that The first recessed portion is disposed on a side of the first extending portion facing the electrode terminal, and the first protruding portion is disposed on a side of the second main body portion facing the first electrode lead-out portion.

66. The battery cell according to claim 65, characterized in that The electrode terminal is further provided with a second recessed portion, a portion of the first electrode lead-out portion forms at least a portion of a second protruding portion, the second protruding portion and the second recessed portion at least partially overlap along the wall thickness direction of the first housing wall, and the second protruding portion and the second recessed portion cooperate with each other; The second recessed portion is disposed on a side of the second extending portion facing the first electrode lead-out portion, and the second protruding portion is disposed on a side of the first main body portion facing the electrode terminal.

67. The battery cell according to claim 66, characterized in that The second recessed portion includes a third step portion and a fourth step portion, and the fourth step portion is arranged on a side of the third step portion away from the first electrode lead-out portion; The second protrusion includes a second extension portion provided on the first electrode lead-out portion, a portion of the electrode terminal is located between the second extension portion and the first shell wall along the wall thickness direction of the first shell wall, and the second extension portion is at least partially accommodated in a step space formed by the third step portion; The battery cell also includes a second insulating member, which is at least partially located between the first electrode lead-out portion and the first shell wall. The second protrusion also includes a second covering portion provided by the second insulating member. Along the wall thickness direction of the first shell wall, a portion of the electrode terminal is located between the second covering portion and the first shell wall, and the second covering portion is at least partially accommodated in a step space formed by the fourth step portion.

68. The battery cell according to claim 64, characterized in that The second extension portion is connected to the second terminal plate through a third connecting column, the first recessed portion is arranged on a side of the first extension portion facing the electrode terminal, and the first protruding portion is arranged on a side of the second extension portion facing the first electrode lead-out portion.

69. The battery cell according to claim 48, characterized in that The busbar is used to be connected to the electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; The electrode lead portion is located on a first wall surface of the battery cell, the first wall surface includes a first boundary and a second boundary opposite to each other along the third direction, and a minimum distance between the electrode lead portion and the first boundary is smaller than a minimum distance between the electrode lead portion and the second boundary.

70. The battery cell according to claim 48, characterized in that The busbar is connected to the electrode lead-out portion along a second direction, and the third direction is perpendicular to the first direction and the second direction in pairs; All the electrode lead-out portions on the same battery cell are located on the same wall surface. On the same battery cell, the distance between the two most distant points of two adjacent electrode lead-out portions along the third direction is less than or equal to half of the maximum dimension of the wall surface along the third direction.

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