Battery and electric device

Abstract

A battery (100) and an electric device. The battery (100) comprises a plurality of battery cells (10) and a busbar member (20); the busbar member (20) comprises a first connection portion (21), a second connection portion (22) and a plurality of buffer portions (23); the plurality of buffer portions (23) are at least partially spaced apart in a first direction and are located between the first connection portion (21) and the second connection portion (22) in a second direction; the first connection portion (21) and the second connection portion (22) are respectively connected to different battery cells (10); the second direction is parallel to the arrangement direction of the plurality of battery cells (10); the first direction intersects the second direction. The buffer portions (23) can be stretched or compressed under the action of a pulling force, to absorb part of the external force and achieve a stress relief function, reducing the risks of structural failure or cracking in the busbar member (20) and the battery cells (10), enhancing the operational reliability of the battery (100).

Description

Battery and electric device

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application 202421263695.8, filed on June 4, 2024, entitled “Battery and electric device”, the entire contents of which are incorporated herein by reference TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, and in particular to a battery and an electric device. BACKGROUND

[0004] Batteries are widely used in electronic devices, such as mobile phones, notebook computers, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft, and electric tools, etc.

[0005] However, during use, part of the structure in the battery is prone to displacement and pulling, thereby causing reliability problems.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a battery and an electric device, which can improve the reliability of the battery.

[0008] In one aspect, the present application provides a battery, comprising a plurality of battery monomers and a busbar member, the busbar member comprising a first connecting portion, a second connecting portion, and a plurality of buffer portions, the plurality of buffer portions being at least partially spaced apart along a first direction and located between the first connecting portion and the second connecting portion in a second direction, the first connecting portion and the second connecting portion being connected to different battery monomers respectively, the second direction being parallel to the arrangement direction of the plurality of battery monomers, and the first direction intersecting the second direction.

[0009] In the above scheme, the busbar member located between the first connecting portion and the second connecting portion can comprise a plurality of spaced apart buffer portions, and the width dimension of a single buffer portion is small, so that the buffer portion is more prone to deformation under external force. With the stretching or contraction of the buffer portion in the second direction, part of the external force can be absorbed, the stress release effect is achieved, and the reliability of the battery is improved.

[0010] In some embodiments, the buffer portion comprises a first sub-section and a second sub-section connected to each other, and the extension directions of the first sub-section and the second sub-section intersect.

[0011] In the above scheme, the buffer portion is provided with a first sub-section and a second sub-section intersecting in the extension direction, so that the buffer portion can be stretched or compressed under the action of the pulling force, and the partial external force can be absorbed, the stress release function is realized, the risk of structural failure or cracking of the battery monomer and the busbar is reduced, and the use reliability of the battery is improved.

[0012] In some embodiments, the battery monomer has opposite first and second edges in the first direction, and the distance between the first connecting portion and the first edge is less than the distance between the first connecting portion and the second edge in the first direction.

[0013] In at least part of the buffer portion, in the direction parallel to the second direction and from the first sub-section to the second sub-section, the distance between the first sub-section and the second edge in the first direction gradually increases, and the distance between the second sub-section and the second edge in the first direction gradually decreases. And / or, in at least part of the buffer portion, in the direction parallel to the second direction and from the first sub-section to the second sub-section, the distance between the first sub-section and the second edge in the first direction gradually decreases, and the distance between the second sub-section and the second edge in the first direction gradually increases.

[0014] In the above scheme, by setting the first sub-section and the second sub-section to the structure of a fold line or a curve, etc. protruding towards the direction close to or away from the second edge, the buffer portion can have a certain size in both the first direction and the second direction. Further, by changing the size of the buffer portion in the first direction, the buffer portion can be elongated or compressed in the second direction, so as to realize the functions of stress absorption and release, and improve the use reliability of the battery.

[0015] In some embodiments, the first connecting portion has a third edge in the first direction, and at least part of the buffer portion is arranged beyond the third edge in the first direction.

[0016] In the above scheme, at least part of the buffer portion is arranged beyond the third edge in the first direction, i.e. at least part of the buffer portion is arranged beyond the first connecting portion in the first direction, and the position of the buffer portion in the first direction is not limited to the third edge, which helps to make the buffer portion have a larger size in the first direction, so that the buffer portion can have a larger deformation allowance in the first direction, so as to improve the compression and deformation ability of the buffer portion in the second direction, improve the stress absorption and release effect of the buffer portion, further reduce the risk of local structural failure and cracking of the battery monomer and the busbar, and improve the use reliability of the battery.

[0017] In some embodiments, in the first direction, the plurality of buffer portions are not arranged beyond the battery monomer. That is, the plurality of buffer portions in the busbar are located between the first edge and the second edge.

[0018] In the above scheme, the buffer part and the position of the corresponding battery monomer are limited, so that in the first direction, the plurality of buffer parts do not exceed the battery monomer, thereby reducing the risk of overlap of the buffer part in the thickness direction of the busbar member relative to other battery monomers or other component structures. In other words, this design can reduce the risk of interference overlap between the buffer part and other structures, thereby improving the structural reliability of the buffer part.

[0019] In some embodiments, the battery monomer further comprises a pressure relief structure, and the pressure relief mechanism is arranged in the first direction away from the plurality of buffer parts.

[0020] In the above scheme, by arranging the pressure relief mechanism away from the plurality of buffer parts in the first direction, the buffer part does not cover the pressure relief mechanism, thereby reducing the influence of the buffer part on the pressure relief function of the pressure relief mechanism and improving the corresponding pressure relief reliability of the battery monomer.

[0021] In some embodiments, the plurality of buffer parts comprises a first buffer part and a second buffer part, the first buffer part is located on one side of the second buffer part close to the second edge, in the first buffer part, in the direction parallel to the second direction and from the first sub-section to the second sub-section, the distance between the first sub-section and the second edge in the first direction gradually decreases, and the distance between the second sub-section and the second edge in the first direction gradually increases. In the second buffer part, in the direction parallel to the second direction and from the first sub-section to the second sub-section, the distance between the first sub-section and the second edge in the first direction gradually increases, and the distance between the second sub-section and the second edge in the first direction gradually decreases.

[0022] In the above scheme, the plurality of buffer parts can include first buffer parts and second buffer parts of different extension forms, at least part of the structure in the first buffer part close to the second edge can protrude in the direction close to the second edge, and at least part of the structure in the second buffer part away from the second edge can protrude in the direction away from the second edge. In this design, when the buffer part is pulled by external force, the movement trend of part of the structure in the first buffer part and part of the structure in the second buffer part in the first direction is opposite, thereby helping to make the stress of the busbar member in the first direction symmetric and uniform, further improving the reliability.

[0023] In some embodiments, the buffer part comprises a first connecting end connected to the first connecting part, and part of the structure in the buffer part protrudes in the thickness direction of the busbar member relative to the first connecting end.

[0024] In the above scheme, by arranging part of the structure in the buffer part in the thickness direction of the busbar member, the buffer part can also deform in the thickness direction of the busbar member, thereby improving the absorption capacity of the buffer part to external stress, and further improving the corresponding use reliability of the battery.

[0025] In some embodiments, in the thickness direction of the busbar, the size of the buffer portion is greater than the size of the first connecting portion.

[0026] In the above scheme, the size of the buffer portion in the thickness direction of the busbar is adjusted. Specifically, the size of the buffer portion in the thickness direction of the busbar is the thickness of the buffer portion, and the resistance of the buffer portion is generally negatively correlated with the thickness size of the buffer portion and negatively correlated with the width size of the buffer portion. On this basis, the embodiments of the present application reduce the width size corresponding to a single buffer portion and increase the thickness size of the buffer portion, so that the thickness of the buffer portion is greater than the thickness of the first connecting portion. Under this design, the buffer portion can meet the deformation requirement while having a smaller resistance value, thereby improving the electrical connection reliability between the plurality of battery monomers.

[0027] In some embodiments, the battery monomer includes a first wall and an electrode terminal arranged on the first wall, and the busbar is arranged on one side of the first wall. In the thickness direction of the busbar, the buffer portion is arranged spaced apart from the first wall.

[0028] In the above scheme, in order to reduce the risk of electrical conduction between the busbar and the first wall, the buffer portion in the busbar is arranged spaced apart from the first wall in the thickness direction of the busbar, thereby reducing the risk of contact between the buffer portion and the first wall and improving the electrical connection reliability between different battery monomers.

[0029] In some embodiments, in the thickness direction of the busbar, the minimum distance between the buffer portion and the first wall is D, and D satisfies: D≥0.3mm.

[0030] In the above scheme, by setting the minimum distance between the buffer portion and the first wall on the busbar to be not less than 0.3mm, the risk of contact between the buffer portion and the first wall due to external impact and other factors is reduced, thereby reducing the risk of conduction between the electrode terminal and the first wall and improving the electrical connection reliability between different battery monomers.

[0031] In a second aspect, the embodiments of the present application provide a power consumption device, which includes the battery in any of the above embodiments.

[0032] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0034] Fig. 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0035] Fig. 2 is an exploded structural schematic diagram of a battery provided by an embodiment of the present application;

[0036] Fig. 3 is a structural schematic diagram of a partial structure in a battery provided by an embodiment of the present application;

[0037] Fig. 4 is a structural schematic diagram of a partial structure in a battery provided by an embodiment of the present application;

[0038] Fig. 5 is an enlarged structural schematic diagram of a region Q in Fig. 4;

[0039] Fig. 6 is a sectional structural schematic diagram of A-A in Fig. 4;

[0040] Fig. 7 is a structural schematic diagram of a partial structure of another battery provided by an embodiment of the present application;

[0041] Fig. 8 is an enlarged structural schematic diagram of a region P in Fig. 7;

[0042] Fig. 9 is a structural schematic diagram of a partial sectional structure of still another battery provided by an embodiment of the present application;

[0043] Fig. 10 is a structural schematic diagram of a partial sectional structure of still another battery provided by an embodiment of the present application.

[0044] The reference signs of the specific embodiments are as follows: 1000, vehicle; 100, battery; 200, controller; 300, motor; 400, box body; 41, first box body part; 42, second box body part; 43, containing part; 10, battery monomer; 11, shell; 111, first wall; 12, electrode terminal; 13, pressure relief mechanism; 14, electrode assembly; 20, busbar member; 21, first connecting part; 22, second connecting part; 23, buffer part; 231, first sub-section; 232, second sub-section; 23a, first buffer part; 23b, second buffer part; J1, first connecting end; E1, first edge; E2, second edge; E3, third edge; E4, fourth edge; X, first direction; Y, second direction; Z, thickness direction. Specific embodiments

[0045] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0048] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. The skilled person explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0050] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0054] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0055] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and a battery cell, and the battery cell or the battery module is accommodated in the box body.

[0056] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0057] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0058] Inside the battery, different battery monomers can be connected in series or parallel with each other through the busbar. During the use of the battery, the adjacent battery monomers can be displaced due to vibration and collision and the like, and the busbar can be subjected to a pulling force. On this basis, if the busbar is subjected to too large a force, part of the stress can be applied to the connection position of the busbar and the battery monomer, thereby causing structural failure of the battery monomer or cracking or even breaking of the busbar, and affecting the use reliability of the battery.

[0059] Based on the above technical problem, the application provides a battery and a power consumption device. The busbar includes a first connecting portion, a second connecting portion, and a plurality of buffer portions located between the first connecting portion and the second connecting portion. The plurality of buffer portions are arranged at intervals, and the extension directions of part of the structures in a single buffer portion are different. When the busbar is subjected to a pulling force, the buffer portion can change its size in the second direction by deformation, thereby buffering and absorbing the pulling force, reducing the risk of structural failure or cracking of the busbar and the battery monomer, and improving the use reliability of the battery.

[0060] The technical solutions described in the embodiments of the application are applicable to batteries and power consumption devices using the batteries. The power consumption devices are, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc. The spacecraft are, for example, airplanes, rockets, space shuttles and spacecraft, etc. The electric toys include, for example, fixed or mobile electric toys, and are specifically, for example, game consoles, electric car toys, electric ship toys and electric airplane toys, etc. The electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, and are specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planes.

[0061] The battery monomers described in the embodiments of the application are not only limited to the above-described power consumption devices, but for the sake of simplicity, the following embodiments are described by taking electric cars as examples.

[0062] Referring to FIG. 1, FIG. 1 is a simple schematic diagram of a vehicle 1000 provided in embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 can be provided with a battery 100 inside, for example, at the bottom, the front, or the rear of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 can be used to control power supply of the battery to the motor 300. The battery can be used for starting, navigation, etc. of the vehicle 1000, and of course, the battery 100 can also be used to drive the vehicle 1000 to run, to replace or partially replace fuel or natural gas to provide driving for the vehicle 1000.

[0063] FIG. 2 is an exploded schematic diagram of a battery provided in some embodiments of the present application. As shown in FIG. 2, the battery 100 includes a box body 400 and a battery cell (not shown in the figure), and the battery cell is contained in the box body 400.

[0064] The box body 400 is used to contain the battery cell, and the box body 400 can be of various structures. In some embodiments, the box body 400 can include a first box body part 41 and a second box body part 42, the first box body part 41 and the second box body part 42 are mutually covered, and the first box body part 41 and the second box body part 42 jointly define a containing part 43 for containing the battery cell. The second box body part 42 can be a hollow structure with one end open, and the first box body part 41 is a plate-shaped structure, which is covered on the open side of the second box body part 42 to form the box body with the containing part 43; or the first box body part 41 and the second box body part 42 can both be hollow structures with one side open, and the open side of the first box body part 41 is covered on the open side of the second box body part 42 to form the box body 400 with the containing part 43. Of course, the first box body part 41 and the second box body part 42 can be of various shapes, such as a cylinder, a cuboid, etc.

[0065] In the battery 100, the battery cell can be one or multiple. If the battery cell is multiple, the multiple battery cells can be connected in series, in parallel, or in a mixed connection, and the mixed connection means that the multiple battery cells are connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells is contained in the box body 400; or the multiple battery cells can be first connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box body 400.

[0066] Next, the structure of the battery will be described with reference to the accompanying drawings. As shown in FIGS. 3-6, the battery 100 includes a plurality of battery cells 10 and a busbar member 20, the busbar member 20 includes a first connecting portion 21, a second connecting portion 22, and a plurality of buffer portions 23, the plurality of buffer portions 23 are at least partially spaced apart along a first direction X and are located between the first connecting portion 21 and the second connecting portion 22 in a second direction Y, the first connecting portion 21 and the second connecting portion 22 are connected to different battery cells 10, respectively, and the second direction Y is parallel to the arrangement direction of the plurality of battery cells 10, and the first direction X intersects the second direction Y.

[0067] The battery 100 at least includes the battery cells 10 and the busbar member 20, the battery cells 10 are main components for providing electric energy, and a plurality of battery cells 10 are usually provided in the battery 100, which can be arranged in a single direction or can be arranged in multiple directions. Among them, the battery cells 10 can have various forms, for example, the battery cells 10 can be in the form of a cylinder, a flat body, a cuboid or other shapes, etc.

[0068] The busbar member 20 is used to realize the electrical connection between the plurality of battery cells 10. Specifically, the busbar member 20 includes the first connecting portion 21, the buffer portion 23, and the second connecting portion 22 arranged in sequence in the second direction Y, and the first connecting portion 21 and the second connecting portion 22 are connected to different battery cells 10, respectively. Among them, each battery cell 10 can include a first pole and a second pole with opposite polarities, and the first pole and the second pole are the positive pole and the negative pole of the battery cell 10, respectively. On this basis, the first connecting portion 21 and the second connecting portion 22 of at least part of the busbar member 20 can be connected to the first poles of different battery cells 10 to realize the parallel connection between different battery cells 10. Or the first connecting portion 21 of at least part of the busbar member 20 is connected to the first pole of the battery cell 10, and the second connecting portion 22 is connected to the second pole of the other battery cell 10 to realize the series connection between different battery cells 10.

[0069] The first connecting portion 21, the buffer portion 23, and the second connecting portion 22 are arranged in electrical connection with each other, and they can include the same material and be formed together in the same preparation process, or they can include different materials and be prepared and formed separately in different preparation processes, and then be relatively fixed with each other through other processes. Among them, the two ends of the buffer portion 23 in the second direction Y can be directly connected to the first connecting portion 21 and the second connecting portion 22, or other connecting structures can be provided between at least one of the first connecting portion 21 and the second connecting portion 22 and the buffer portion 23, as long as the first connecting portion 21, the second connecting portion 22, and the buffer portion 23 in the busbar member 20 are relatively fixed and can realize mutual electrical connection.

[0070] The plurality of buffer portions 23 are arranged at intervals in the first direction X, which is perpendicular to the second direction Y. In the related art, only one block structure is arranged between the first connecting portion 21 and the second connecting portion 22. In the embodiment, the first connecting portion 21 and the second connecting portion 22 are formed with a hole structure penetrating in the thickness direction Z of the busbar 20 by a hole digging process. The hole structure can be one or more. The portion of the busbar 20 between the first connecting portion 21 and the second connecting portion 22 is divided into a plurality of buffer portions 23 arranged at intervals by the hole structure. Compared with the block structure in the related art, the width of each buffer portion 23 is smaller, so that the buffer portion 23 is easily deformed under an external force. The buffer portion 23 can be in a strip structure.

[0071] Further, no other structure can be arranged between adjacent buffer portions 23, or a structure capable of being deformed can be arranged between adjacent buffer portions 23. For example, a rubber structure or the like can be arranged between adjacent buffer portions 23 to meet the deformation requirement. Alternatively, the structure between adjacent buffer portions 23 and the buffer portions 23 are made of the same material, but the thickness of the structure is smaller than that of the buffer portions 23 to meet the deformation requirement.

[0072] In summary, in the embodiment, the busbar 20 between the first connecting portion 21 and the second connecting portion 22 can include a plurality of buffer portions 23 arranged at intervals, and the width of each buffer portion 23 is smaller, so that the buffer portion 23 is more easily deformed under an external force. The stretching or contraction of the buffer portion 23 in the second direction Y can absorb part of the external force, release stress, and improve the reliability of the battery.

[0073] It should be noted that the battery cell 10 can include various component structures, and the battery cell 10 and the busbar member 20 can have various connection modes. For example, the battery cell 10 can include a shell 11, an electrode assembly 14 located in the shell 11, and an electrode terminal 12 arranged on the shell 11 and electrically connected to the electrode assembly 14. In this case, the electrode terminals 12 on different battery cells 10 can be connected and fixed to the first connecting portion 21 or the second connecting portion 22 of the busbar member 20 by welding. Further, the embodiments of the present application can reduce the risk of stress concentration at the connection position of the electrode terminal 12, the first connecting portion 21, the second connecting portion 22, and the electrode terminal 12 relative to the first connecting portion 21 or the second connecting portion 22, reduce the risk of failure of the electrode terminal 12 and cracking of the busbar member 20, and improve the use reliability of the battery 100 by arranging a plurality of buffer portions 23 in the busbar member 20 to release stress by deformation of the buffer portions 23.

[0074] The shell 11 can have various forms. In some embodiments, the shell 11 can be a sealed structure or a non-sealed structure. For example, when the shell 11 is a sealed structure, the shell 11 can protect the electrode assembly 14 and prevent leakage of electrolyte and the like. When the shell 11 is a non-sealed structure, the shell 11 can protect the electrode assembly 14, and a sealing bag can be further included between the shell 11 and the electrode assembly 14 to encapsulate the electrode assembly 14 and electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0075] In some embodiments, the buffer portion 23 includes a first sub-portion 231 and a second sub-portion 232 connected to each other, and the extension directions of the first sub-portion 231 and the second sub-portion 232 intersect,

[0076] The buffer portion 23 includes the first sub-portion 231 and the second sub-portion 232 with intersecting extension directions, which can make the connection position of the first sub-portion 231 and the second sub-portion 232 more easily displaceable under external force, thereby changing the length of the buffer portion 23 in the second direction Y. Further, the stretching or contraction of the buffer portion 23 in the second direction Y can absorb part of the external force and release stress.

[0077] It should be noted that the first sub-portion 231 and the second sub-portion 232 can have a straight line structure, i.e., the first sub-portion 231 extends in the same direction at each position, and the second sub-portion 232 extends in the same direction at each position. Alternatively, the first sub-portion 231 and the second sub-portion 232 can have an arc line or other structure, and the extension direction of the first sub-portion 231 refers to the direction of the extension trend of the first sub-portion 231 as a whole.

[0078] Further, the extension direction of the first sub-section 231 and the extension direction of the second sub-section 232 can have various forms, for example, the extension direction of the first sub-section 231 can intersect with the first direction X and the second direction Y two by two, or the extension direction of the first sub-section 231, the first direction X and the second direction Y can be parallel to the same plane, and the second sub-section 232 is the same. Further, when the first direction X, the second direction Y, the extension direction of the first sub-section 231 and the extension direction of the second sub-section 232 are all parallel to the same plane, it indicates that the buffer portion 23 does not exist or has a small degree of protrusion in the thickness direction Z of the current collecting member, thereby helping to reduce the influence of the buffer portion 23 on the volume of the battery 100, and improve the energy density of the battery 100. In addition, the buffer portion 23 can only include the first sub-section 231 and the second sub-section 232, or the buffer portion 23 can also include other sub-sections intersecting with the extension direction of the first sub-section 231 and the second sub-section 232.

[0079] In the embodiments of the present application, the buffer portion 23 is provided with the first sub-section 231 and the second sub-section 232 with intersecting extension directions, so that the buffer portion 23 can be stretched or compressed under the action of the pulling force, and realize the absorption of part of the external force, realize the stress release function, reduce the risk of structural failure or cracking of the current collecting member 20 and the battery monomer 10, and improve the use reliability of the battery 100.

[0080] In some embodiments, the battery monomer 10 has opposite first and second edges E1 and E2 in the first direction X, and the distance between the first connecting portion 21 and the first edge E1 is less than the distance between the first connecting portion 21 and the second edge E2 in the first direction X.

[0081] In at least part of the buffer portion 23, in the direction parallel to the second direction Y and from the first sub-section 231 to the second sub-section 232, the distance between the first sub-section 231 and the second edge E2 in the first direction X gradually increases, and the distance between the second sub-section 232 and the second edge E2 in the first direction X gradually decreases. And / or, in at least part of the buffer portion 23, in the direction parallel to the second direction Y and from the first sub-section 231 to the second sub-section 232, the distance between the first sub-section 231 and the second edge E2 in the first direction X gradually decreases, and the distance between the second sub-section 232 and the second edge E2 in the first direction X gradually increases.

[0082] The battery cell 10 has two opposite edges, a first edge E1 and a second edge E2 in the first direction X. Optionally, the battery cell 10 can comprise a housing 11, and the first edge E1 and the second edge E2 can be two opposite edges of the housing 11. In the first direction X, neither the first connecting portion 21 nor the second connecting portion 22 extends beyond the first edge E1 and the second edge E2. The first connecting portion 21 is closer to the first edge E1 than to the second edge E2.

[0083] In the at least partial buffer portion 23, in the direction from the first sub-portion 231 to the second sub-portion 232, the first sub-portion 231 extends away from the second edge E2, and the second sub-portion 232 extends towards the second edge E2. In other words, the zigzag or curved line structure formed by the first sub-portion 231 and the second sub-portion 232 protrudes away from the second edge E2. In this case, the zigzag or curved line structure formed by the first sub-portion 231 and the second sub-portion 232 has a certain size in both the first direction X and the second direction Y, so that under the action of an external force, the size of the zigzag or curved line structure formed by the first sub-portion 231 and the second sub-portion 232 in the first direction X can be changed, so that the buffer portion 23 can be compressed or elongated in the second direction Y, thereby achieving the functions of stress absorption and release.

[0084] Similarly, as shown in FIGS. 4 and 5, in the at least partial buffer portion 23, in the direction from the first sub-portion 231 to the second sub-portion 232, the first sub-portion 231 extends towards the second edge E2, and the second sub-portion 232 extends away from the second edge E2. In other words, the zigzag or curved line structure formed by the first sub-portion 231 and the second sub-portion 232 protrudes towards the second edge E2. In this case, the zigzag or curved line structure formed by the first sub-portion 231 and the second sub-portion 232 has a certain size in both the first direction X and the second direction Y, so that under the action of an external force, the size of the zigzag or curved line structure formed by the first sub-portion 231 and the second sub-portion 232 in the first direction X can be changed, so that the buffer portion 23 can be compressed or elongated in the second direction Y, thereby achieving the functions of stress absorption and release.

[0085] It should be noted that the plurality of buffer portions 23 are generally located on the side of the second edge E2 facing the first edge E1, and the buffer portion 23 and the first edge E1 can have various positional relationships, for example, at least part of at least some of the buffer portions 23 are located on the side of the first edge E1 away from the second edge E2, or each buffer portion 23 is completely located on the side of the first edge E1 facing the second edge E2. And for the plurality of buffer portions 23, the extension of each buffer portion 23 can be the same or similar, or at least some of the buffer portions 23 can also have different corresponding extension manners, as long as there are different sub-segments with intersecting extension directions in a single buffer portion 23.

[0086] In summary, in the embodiments of the present application, by setting the fold line or curve structure composed of the first sub-segment 231 and the second sub-segment 232 to protrude towards the direction close to or away from the second edge E2, the buffer portion 23 can have a certain size in the first direction X and in the second direction Y at the same time. Further, by changing the size of the buffer portion 23 in the first direction X, the buffer portion 23 can be elongated or compressed in the second direction Y, thereby realizing the functions of stress absorption and release, and improving the use reliability of the battery 100.

[0087] In some embodiments, as shown in FIGS. 4 and 5, the first connecting portion 21 has a third edge E3 in the first direction X, and at least part of the buffer portions 23 are arranged beyond the third edge E3 in the first direction X.

[0088] The third edge E3 is an edge of the first connecting portion 21 in the first direction X, wherein the third edge E3 can be located on the side of the first connecting portion 21 facing the first edge E1, or can also be located on the side of the first connecting portion 21 facing the second edge E2.

[0089] In the embodiments of the present application, at least part of the buffer portions 23 are arranged beyond the third edge E3 in the first direction X, that is, at least part of the buffer portions 23 are arranged beyond the first connecting portion 21 in the first direction X, and the position of the buffer portion 23 in the first direction X is not limited to the third edge E3, which helps the buffer portion 23 to have a larger size in the first direction X, so that the buffer portion 23 can have a larger deformation allowance in the first direction X, thereby improving the compression and deformation ability of the buffer portion 23 in the second direction Y, improving the corresponding stress absorption and release effect of the buffer portion 23, further reducing the risk of local structural failure and cracking of the battery monomer 10 and the busbar member 20, and improving the use reliability of the battery 100.

[0090] In addition to the third edge E3, the first connecting portion 21 further comprises a fourth edge E4 opposite to the third edge E3 in the first direction X, wherein at least part of the buffer portions 23 can be arranged beyond the fourth edge E4 in the first direction X, that is, the two sides of the plurality of buffer portions 23 in the first direction X can both be beyond the first connecting portion 21, or all of the buffer portions 23 can also be located between the third edge E3 and the fourth edge E4 in the first direction X, on the basis of which the overall size of the entire buffer portions 23 in the first direction X can be greater than, less than or equal to the size of the first connecting portion 21 in the first direction X.

[0091] In some embodiments, as shown in FIGS. 4 and 5, in the first direction X, the plurality of buffer portions 23 are not arranged beyond the battery monomer 10. That is, the plurality of buffer portions 23 in the busbar member 20 are all located between the first edge E1 and the second edge E2.

[0092] In combination with the foregoing, it can be known that the battery comprises a plurality of battery monomers 10, and the plurality of battery monomers 10 can be arranged in a single direction or arrayed in multiple directions. In addition to the plurality of battery monomers 10, the battery further comprises other component structures, such as heat exchange assemblies and beam structures.

[0093] Further, the embodiments of the present application limit the positions of the buffer portions 23 and the corresponding battery monomers 10, so that in the first direction X, the plurality of buffer portions 23 are not arranged beyond the battery monomer 10, so as to reduce the risk of overlap of the buffer portions 23 with respect to other battery monomers 10 or other component structures in the thickness direction Z of the busbar member 20. In other words, this design can reduce the risk of interference and overlap of the buffer portions 23 with other structures, so as to improve the structural reliability of the buffer portions 23.

[0094] In some embodiments, as shown in FIGS. 4 and 5, the battery monomer 10 further comprises a pressure relief mechanism 13, and the pressure relief mechanism 13 is arranged in the first direction X with the plurality of buffer portions 23, that is, the projection of the pressure relief mechanism 13 in the thickness direction Z of the busbar member 20 is located outside the projection of the plurality of buffer portions 23 in the thickness direction Z of the busbar member 20.

[0095] The pressure relief mechanism 13 refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery monomer 10 reaches a predetermined threshold. The threshold value is different according to different design requirements. The threshold value can depend on the material of one or several of the positive plate, the negative plate, the electrolyte and the separator in the battery monomer 10. The internal pressure of the battery monomer 10 is the pressure inside the shell 11.

[0096] The pressure relief mechanism 13 can take the form of, for example, a rupture disc, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive element or configuration that actuates or breaks when the internal pressure of the battery cell 10 reaches a predetermined threshold, thereby creating an opening or passage for the internal pressure to be released. The actuation portion can be formed by, for example, providing a score, a groove, or a less strong material.

[0097] As referred to herein, "actuation" of the pressure relief mechanism 13 refers to the pressure relief mechanism 13 being activated or brought to a state in which the internal pressure of the battery cell 10 is released. The actuation of the pressure relief mechanism 13 can include, but is not limited to, at least a portion of the pressure relief mechanism 13 breaking, shattering, tearing, or opening, and the like. Upon actuation of the pressure relief mechanism 13, the high-temperature, high-pressure material inside the battery cell 10 is discharged as an effluent from the actuated portion. In this way, the battery cell 10 can be depressurized in a controlled manner, thereby avoiding potentially more severe accidents.

[0098] As referred to herein, the effluent from the battery cell 10 includes, but is not limited to, electrolyte, dissolved or fragmented positive and negative electrode plates, fragments of separators, high-temperature, high-pressure gases generated by reactions, flames, and the like.

[0099] In embodiments of the present application, the pressure relief mechanism 13 is spaced apart from the plurality of buffer portions 23 in the first direction X, such that the buffer portions 23 do not cover the pressure relief mechanism 13. In this way, the influence of the buffer portions 23 on the pressure relief function of the pressure relief mechanism 13 is reduced, and the corresponding pressure relief reliability of the battery cell 10 is improved.

[0100] In some embodiments, referring to FIGS. 7 and 8, the plurality of buffer portions 23 includes a first buffer portion 23a and a second buffer portion 23b, the first buffer portion 23a is located on a side of the second buffer portion 23b closer to the second edge E2, in the first buffer portion 23a, in a direction parallel to the second direction Y and from the first sub-section 231 to the second sub-section 232, the distance between the first sub-section 231 and the second edge E2 in the first direction X gradually decreases, and the distance between the second sub-section 232 and the second edge E2 in the first direction X gradually increases. In the second buffer portion 23b, in a direction parallel to the second direction Y and from the first sub-section 231 to the second sub-section 232, the distance between the first sub-section 231 and the second edge E2 in the first direction X gradually increases, and the distance between the second sub-section 232 and the second edge E2 in the first direction X gradually decreases.

[0101] The plurality of buffer portions 23 include at least two types of buffer portions 23, i.e., a first buffer portion 23a and a second buffer portion 23b, which have different extension forms. Specifically, the first buffer portion 23a is closer to the second edge E2 than the second buffer portion 23b, and the first buffer portion 23a has a structure such as a broken line or a curve formed by a first sub-section 231 and a second sub-section 232, which protrudes towards the second edge E2, while the second buffer portion 23b has a structure such as a broken line or a curve formed by the first sub-section 231 and the second sub-section 232, which protrudes away from the second edge E2. Further, the first buffer portion 23a and the second buffer portion 23b are symmetrically arranged with respect to a virtual straight line parallel to the second direction Y.

[0102] In the embodiments of the present application, the plurality of buffer portions 23 include the first buffer portion 23a and the second buffer portion 23b having different extension forms, at least part of the structure of the first buffer portion 23a close to the second edge E2 protrudes towards the second edge E2, and at least part of the structure of the second buffer portion 23b away from the second edge E2 protrudes away from the second edge E2. In this design, when the buffer portion 23 is pulled by an external force, the movement tendency of the part of the structure of the first buffer portion 23a and the part of the structure of the second buffer portion 23b in the first direction X is opposite, which helps to make the stress on the busbar member 20 in the first direction X symmetrical and uniform, and further improves the reliability.

[0103] In some embodiments, referring to FIG. 9, the buffer portion 23 includes a first connecting end J1 connected to the first connecting portion 21, and part of the structure of the buffer portion 23 protrudes in the thickness direction Z of the busbar member 20 with respect to the first connecting end J1.

[0104] The first connecting end J1 is an end of the buffer portion 23 for connecting the first connecting portion 21, and the first connecting end J1 is generally at the same height as the first connecting portion 21 in the thickness direction Z of the busbar member 20. Part of the structure of the buffer portion 23 protrudes in the thickness direction Z of the busbar member 20 with respect to the first connecting end J1, i.e., part of the structure of the buffer portion 23 has a certain undulation in the thickness direction Z of the busbar member 20. Specifically, part of the structure of the buffer portion 23 can protrude towards the battery monomer 10 in the thickness direction Z of the busbar member 20, or part of the structure of the buffer portion 23 can protrude away from the battery monomer 10 in the thickness direction Z of the busbar member 20.

[0105] In the embodiment of the present application, part of the structure in the buffer portion 23 is arranged in the thickness direction Z of the current collecting member 20, so that the buffer portion 23 can also deform in the thickness direction Z of the current collecting member 20, thereby improving the stress absorption capacity of the buffer portion 23, and further improving the use reliability of the battery 100.

[0106] Similarly, in some optional embodiments, the buffer portion 23 includes a second connecting end connected to the second connecting portion 22, and part of the structure in at least part of the buffer portion 23 protrudes in the thickness direction Z of the current collecting member relative to the second connecting end.

[0107] In some embodiments, referring to FIG. 10, in the thickness direction Z of the current collecting member, the size of the buffer portion 23 is greater than the size of the first connecting portion 21.

[0108] As known from the foregoing, the embodiment of the present application forms a hole-shaped structure between the first connecting portion 21 and the second connecting portion 22 by the hole digging treatment, the hole-shaped structure can separate the adjacent buffer portions 23, and the buffer portion 23 has a smaller width size, so that under the action of external force, the buffer portion 23 can deform and absorb part of the stress, thereby improving the reliability of the battery 100.

[0109] On this basis, in order to reduce the corresponding resistance value of the buffer portion 23, the size of the buffer portion 23 in the thickness direction Z of the current collecting member 20 is adjusted in the embodiment of the present application. Specifically, the size of the buffer portion 23 in the thickness direction Z of the current collecting member 20 is the thickness of the buffer portion 23, and the resistance of the buffer portion 23 is generally negatively correlated with the thickness size of the buffer portion 23 and negatively correlated with the width size of the buffer portion 23. On this basis, the embodiment of the present application reduces the corresponding width size of the buffer portion 23 and increases the thickness size of the buffer portion 23, so that the thickness of the buffer portion 23 is greater than the thickness of the first connecting portion 21. Under this design, the buffer portion 23 can meet the deformation requirement while having a smaller resistance value, thereby improving the electrical connection reliability between the plurality of battery monomers 10.

[0110] It should be noted that, since in the thickness direction Z of the current collecting member, the size of the buffer portion 23 is greater than the size of the first connecting portion 21, the buffer portion 23 can protrude relative to the first connecting portion 21 in the thickness direction Z of the current collecting member. Further, the buffer portion 23 can protrude only on one side surface of the first connecting portion 21 facing the battery monomer 10, or the buffer portion 23 can protrude only on one side surface of the first connecting portion 21 away from the battery monomer 10, or the buffer portion 23 can protrude on both the surface of the first connecting portion 21 facing the battery monomer 10 and the surface of the first connecting portion 21 away from the battery monomer 10.

[0111] Similarly, in some optional embodiments, in the thickness direction Z of the busbar, the size of the buffer portion 23 is greater than the size of the second connecting portion 22.

[0112] In some embodiments, the battery cell 10 includes a first wall 111 and an electrode terminal 12 arranged on the first wall 111, and the busbar 20 is arranged on one side of the first wall 111. In the thickness direction Z of the busbar 20, the buffer portion 23 is arranged spaced apart from the first wall 111.

[0113] The electrode terminal 12 is a component for realizing the transmission of electrical energy between the inside and outside of the battery cell 10. The battery cell 10 includes a housing 11 and an electrode assembly 14 arranged in the housing 11. The housing 11 includes a first wall 111, and the electrode terminal 12 is arranged on the first wall 111 and is electrically connected to the electrode assembly 14 and the busbar 20. Optionally, the electrode terminal 12 can be electrically connected to the busbar 20 by welding.

[0114] The first wall 111 is a wall structure on the housing 11. Optionally, the housing 11 includes a shell having a receiving cavity and an opening, and an end cover covering the shell. The end cover includes the first wall 111. The electrode terminal 12 is arranged on the first wall 111, but there is an insulating member between the electrode terminal 12 and the first wall 111 to insulate the electrode terminal 12 from the first wall 111. Further, the busbar 20 is also insulated from the first wall 111.

[0115] In the embodiments of the present application, in order to reduce the risk of electrical conduction between the busbar 20 and the first wall 111, the buffer portion 23 in the busbar 20 is arranged spaced apart from the first wall 111 in the thickness direction Z of the busbar 20. In this way, the risk of contact between the buffer portion 23 and the first wall 111 is reduced, and the electrical connection reliability between different battery cells 10 is improved.

[0116] In some embodiments, in the thickness direction Z of the busbar 20, the minimum distance between the buffer portion 23 and the first wall 111 is D, and D satisfies: D≥0.3mm. Optionally, D can be one of 0.3mm, 0.5mm, 0.7mm, 1mm and 5mm.

[0117] In the embodiments of the present application, by setting the minimum distance between the buffer portion 23 and the first wall 111 on the busbar 20 to be not less than 0.3mm, the risk of contact between the buffer portion 23 and the first wall 111 due to external impact and other factors is reduced. In this way, the risk of conduction between the electrode terminal 12 and the first wall 111 is reduced, and the electrical connection reliability between different battery cells 10 is improved.

[0118] In a third aspect, the embodiments of the present application provide a power consuming device, the power consuming device comprising the battery 100 in any of the preceding embodiments.

[0119] It should be noted that the power consuming device provided by the embodiments of the present application has the beneficial effects of the battery 100 in any of the preceding embodiments, and the specific content can be referred to the description of the beneficial effects of the battery 100. The embodiments of the present application will not be described here again.

[0120] According to some embodiments of the present application, referring to FIGS. 7, 8 and 10, the battery 100 comprises a plurality of battery monomers 10 and a busbar member 20, the battery monomer 10 comprises a first wall 111, a pressure relief mechanism 13 and an electrode terminal 12 arranged on the first wall 111. The busbar member 20 comprises a first connecting portion 21, a second connecting portion 22 and a plurality of buffer portions 23 located between the first connecting portion 21 and the second connecting portion 22 along a second direction Y, the plurality of buffer portions 23 are arranged at intervals along a first direction X, the first connecting portion 21 and the second connecting portion 22 are respectively connected to the electrode assembly 14 of different battery monomers 10, the buffer portion 23 comprises a first sub-section 231 and a second sub-section 232, and the first direction X intersects the second direction Y.

[0121] The battery monomer 10 has opposite first and second edges E1 and E2 in the first direction X, and the distance between the first connecting portion 21 and the first edge E1 is less than the distance between the first connecting portion 21 and the second edge E2 in the first direction X. The plurality of buffer portions 23 comprises a first buffer portion 23a and a second buffer portion 23b, and the first buffer portion 23a is located on the side of the second buffer portion 23b close to the second edge E2. In the first buffer portion 23a, in the direction parallel to the second direction Y and from the first sub-section 231 to the second sub-section 232, the distance between the first sub-section 231 and the second edge E2 in the first direction X gradually decreases, and the distance between the second sub-section 232 and the second edge E2 in the first direction X gradually increases. In the second buffer portion 23b, in the direction parallel to the second direction Y and from the first sub-section 231 to the second sub-section 232, the distance between the first sub-section 231 and the second edge E2 in the first direction X gradually increases, and the distance between the second sub-section 232 and the second edge E2 in the first direction X gradually decreases.

[0122] The first connecting portion 21 has a third edge E3 in the first direction X, and at least part of the buffer portion 23 is arranged beyond the third edge E3 in the first direction X. In the first direction X, the plurality of buffer portions 23 is not arranged beyond the electrode monomer, and the pressure relief structure is arranged at intervals with the plurality of buffer portions 23 in the first direction X. In the thickness direction Z of the busbar member 20, the size of the buffer portion 23 is greater than the size of the first connecting portion 21, and the buffer portion 23 is arranged at intervals with the first wall 111.

[0123] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising: a plurality of battery cells; a busbar member including a first connecting portion, a second connecting portion, and a plurality of buffer portions at least partially spaced apart in a first direction and located between the first connecting portion and the second connecting portion in a second direction, the first connecting portion and the second connecting portion being connected to different battery cells, respectively; the second direction being parallel to a direction in which the plurality of battery cells are arranged, and the first direction intersecting the second direction.

2. The battery of claim 1, wherein, the buffer portion including a first sub-section and a second sub-section connected to each other, the first sub-section and the second sub-section intersecting in an extension direction.

3. The battery of claim 2, wherein, the battery cell having opposite first and second edges in the first direction, the first connecting portion being located closer to the first edge than to the second edge in the first direction; in at least some of the buffer portions, in a direction parallel to the second direction and from the first sub-section to the second sub-section, a distance between the first sub-section and the second edge in the first direction gradually increases, and a distance between the second sub-section and the second edge in the first direction gradually decreases; and / or in at least some of the buffer portions, in a direction parallel to the second direction and from the first sub-section to the second sub-section, a distance between the first sub-section and the second edge in the first direction gradually decreases, and a distance between the second sub-section and the second edge in the first direction gradually increases.

4. The battery of claim 3, wherein, the first connecting portion having a third edge in the first direction, at least some of the buffer portions being located beyond the third edge in the first direction.

5. The battery of claim 4, wherein, in the first direction, none of the buffer portions is located beyond the battery cell.

6. The battery of claim 3, wherein, the battery cell further including a pressure relief mechanism spaced apart from the buffer portions in the first direction.

7. The battery of claim 3, wherein, the buffer portions include a first buffer portion and a second buffer portion, the first buffer portion being located on a side of the second buffer portion closer to the second edge; in the first buffer portion, in a direction parallel to the second direction and from the first sub-section to the second sub-section, a distance between the first sub-section and the second edge in the first direction gradually decreases, and a distance between the second sub-section and the second edge in the first direction gradually increases; in the second buffer portion, in a direction parallel to the second direction and from the first sub-section to the second sub-section, a distance between the first sub-section and the second edge in the first direction gradually increases, and a distance between the second sub-section and the second edge in the first direction gradually decreases.

8. The battery of claim 1, wherein, the buffer portion including a first connecting end connected to the first connecting portion, and a part of the buffer portion protruding in a thickness direction of the busbar member relative to the first connecting end.

9. The battery of claim 1, wherein, in the thickness direction of the busbar member, a size of the buffer portion is greater than a size of the first connecting portion or a size of the second connecting portion.

10. The battery of claim 1, wherein, The battery cell includes a first wall and an electrode terminal provided to the first wall, and the busbar is provided to one side of the first wall, and in a thickness direction of the busbar, the buffer portion is provided to be spaced apart from the first wall.

11. The battery of claim 9, wherein, In the thickness direction, a minimum distance between the buffer portion and the first wall is D, and D satisfies: D ≥ 0.3 mm.

12. An electric device comprising the battery as claimed in any one of claims 1 to 11, the battery being used to provide electric energy.

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