Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, the battery comprises a plurality of battery monomers and a confluence component, the confluence component comprises a first connecting part, a second connecting part and a plurality of buffer parts, the plurality of buffer parts are at least partially arranged at intervals along a first direction and are located between the first connecting part and the second connecting part in a second direction, the first connecting part and the second connecting part are respectively connected to different battery monomers, the second direction is parallel to the arrangement direction of the plurality of battery monomers, and the first direction is intersected with the second direction. According to the embodiment of the invention, the buffer part can be stretched or compressed under the action of the pulling force, the absorption of part of external force is realized, the stress release function is realized, the risk of structural failure or cracking of the confluence component and the battery monomers is reduced, and the use reliability of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] However, during use, some structures in the battery are prone to displacement and pulling, which may cause reliability problems. Utility Model Content

[0004] In view of the above problems, the present application provides a battery and an electrical device, which can improve the reliability of the battery.

[0005] On the one hand, an embodiment of the present application provides a battery, comprising a plurality of battery cells and a collector component, the collector component 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 being 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 respectively connected to different battery cells, the second direction being parallel to an arrangement direction of the plurality of battery cells, and the first direction intersecting with the second direction.

[0006] In the above solution, the current collecting member between the first connection part and the second connection part can include a plurality of buffer parts arranged at intervals, and the width of a single buffer part is small, so that the buffer part is more likely to deform under the action of external force. In this way, the stretching or contraction of the buffer part in the second direction can absorb part of the external force, achieve stress release, and improve the reliability of the battery.

[0007] In some embodiments, the buffer portion includes a first sub-segment and a second sub-segment connected to each other, and extension directions of the first sub-segment and the second sub-segment intersect.

[0008] In the above scheme, the buffer portion is provided with a first sub-segment and a second sub-segment whose extension directions intersect, so that the buffer portion can be stretched or compressed under the action of a pulling force, and absorb part of the external force, thereby realizing a stress release function, reducing the risk of structural failure or cracking of the collector component and the battery cell, and improving the reliability of the battery.

[0009] In some embodiments, the battery cell has a first edge and a second edge opposite to each other in a first direction, and in the first direction, a distance between the first connection portion and the first edge is smaller than a distance between the first connection portion and the second edge.

[0010] In at least part of the buffer portion, in a direction parallel to the second direction and pointing from the first subsegment to the second subsegment, the distance between the first subsegment and the second edge in the first direction gradually increases, and the distance between the second subsegment and the second edge in the first direction gradually decreases. And / or, in at least part of the buffer portion, in a direction parallel to the second direction and pointing from the first subsegment to the second subsegment, the distance between the first subsegment and the second edge in the first direction gradually decreases, and the distance between the second subsegment and the second edge in the first direction gradually increases.

[0011] In the above solution, by setting the fold line or curve structure formed by the first sub-segment and the second sub-segment to protrude in 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. Then, by changing the size of the buffer portion in the first direction, the buffer portion can be extended or compressed in the second direction, thereby achieving the function of stress absorption and release, and improving the reliability of the battery.

[0012] In some embodiments, the first connecting portion has a third edge in the first direction, and at least a portion of the buffer portion is disposed beyond the third edge in the first direction.

[0013] In the above scheme, at least part of the buffer portion is arranged beyond the third edge in the first direction, that is, 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 by the third edge. This helps to make the buffer portion have a larger size in the first direction, so that the buffer portion can have a larger deformation margin in the first direction, thereby improving the compression and deformation capacity of the buffer portion in the second direction, improving the corresponding stress absorption and release effect of the buffer portion, further reducing the risk of local structural failure and cracking of the battery cell and the collector component, and improving the reliability of the battery.

[0014] In some embodiments, in the first direction, the plurality of buffer portions are arranged not beyond the battery cells, that is, the plurality of buffer portions in the current collecting member are all located between the first edge and the second edge.

[0015] In the above scheme, the positions of the buffer portions and the corresponding battery cells are limited so that in the first direction, the multiple buffer portions do not exceed the battery cell settings, thereby reducing the risk of the buffer portions overlapping with other battery cells or other component structures in the thickness direction of the collector member. In other words, this design can reduce the risk of interference and overlap between the buffer portions and other structures, thereby improving the structural reliability of the buffer portions.

[0016] In some embodiments, the battery cell further includes a pressure relief structure, and the pressure relief structure and the plurality of buffer portions are spaced apart in the first direction.

[0017] In the above solution, the pressure relief mechanism and the plurality of buffer parts are spaced apart in the first direction so that the buffer parts do not cover the pressure relief mechanism, thereby reducing the influence of the buffer parts on the pressure relief function of the pressure relief mechanism and improving the pressure relief reliability of the battery cells.

[0018] In some embodiments, the plurality of buffer portions include a first buffer portion and a second buffer portion, the first buffer portion is located on a side of the second buffer portion close to the second edge, and in the first buffer portion, in a direction parallel to the second direction and pointing from the first sub-segment to the second sub-segment, the distance between the first sub-segment and the second edge in the first direction gradually decreases, and the distance between the second sub-segment and the second edge in the first direction gradually increases. In the second buffer portion, in a direction parallel to the second direction and pointing from the first sub-segment to the second sub-segment, the distance between the first sub-segment and the second edge in the first direction gradually increases, and the distance between the second sub-segment and the second edge in the first direction gradually decreases.

[0019] In the above solution, the plurality of buffers can include first buffers and second buffers of different extension forms, and at least part of the structure in the first buffer relatively close to the second edge can protrude in a direction close to the second edge, and at least part of the structure in the second buffer relatively far from the second edge can protrude in a direction far from the second edge. Under this design, when the buffer is pulled by an external force, the movement trend of part of the structure in the first buffer and part of the structure in the second buffer in the first direction is opposite, which helps to make the force on the conduit component in the first direction symmetrical and uniform, further improving reliability.

[0020] In some embodiments, the buffer portion includes a first connection end connected to the first connection portion, and a portion of the structure in the buffer portion is protruded relative to the first connection end in the thickness direction of the current collecting component.

[0021] In the above scheme, by setting some structures in the buffer part to be able to deform in the thickness direction of the collector component, the buffer part can also be deformed in the thickness direction of the collector component, thereby improving the buffer part's ability to absorb external stress and further improving the corresponding reliability of the battery.

[0022] In some embodiments, in a thickness direction of the busbar, a size of the buffer portion is larger than a size of the first connecting portion.

[0023] In the above scheme, the size of the buffer portion in the thickness direction of the current collecting component is adjusted. Specifically, the size of the buffer portion in the thickness direction of the current collecting component is the thickness of the buffer portion, and the resistance of the buffer portion is usually negatively correlated with the thickness dimension of the buffer portion, and negatively correlated with the width dimension of the buffer portion. On this basis, the embodiment of the present application reduces the width dimension corresponding to a single buffer portion and increases the thickness dimension 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 have a smaller resistance value while meeting the deformation requirements, thereby improving the reliability of the electrical connection between multiple battery cells.

[0024] In some embodiments, the battery cell includes a first wall and an electrode terminal disposed on the first wall, the current collecting member is disposed on one side of the first wall, and the buffer portion is spaced apart from the first wall in a thickness direction of the current collecting member.

[0025] In the above scheme, in order to reduce the risk of electrical conduction between the collector component and the first wall, the buffer portion in the collector component is arranged to be spaced apart from the first wall in the thickness direction of the collector component, thereby reducing the risk of contact between the buffer portion and the first wall and improving the reliability of electrical connection between different battery cells.

[0026] In some embodiments, in the thickness direction of the current collecting member, a minimum distance between the buffer portion and the first wall is D, and D satisfies: D≥0.3 mm.

[0027] In the above scheme, by setting the minimum distance between the buffer portion and the first wall on the collector component to be no less than 0.3 mm, 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 reliability of electrical connection between different battery cells.

[0028] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery in any of the aforementioned embodiments.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of an exploded structure of a battery provided in an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of a local structure of a battery provided in an embodiment of the present application;

[0034] Figure 4 is a schematic diagram of a local structure of a battery provided in an embodiment of the present application;

[0035] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at the middle area Q;

[0036] Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle;

[0037] Figure 7 is a partial structural schematic diagram of another battery provided in an embodiment of the present application;

[0038] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure at the middle area P;

[0039] Fig. 9 is a schematic diagram of a partial cross-sectional structure of another battery provided in an embodiment of the present application;

[0040] Fig.10 It is a schematic diagram of a partial cross-sectional structure of another battery provided in an embodiment of the present application.

[0041] In the attached figure:

[0042] 1000. Vehicles;

[0043] 100, battery; 200, controller; 300, motor; 400, housing; 41, first housing portion; 42, second housing portion; 43, storage portion;

[0044] 10. Battery cell; 11. Housing; 111. First wall; 12. Electrode terminal; 13. Pressure relief mechanism; 14. Electrode assembly;

[0045] 20. current collecting member; 21. first connecting portion; 22. second connecting portion; 23. buffer portion; 231. first subsection; 232. second subsection; 23a. first buffer portion; 23b. second buffer portion;

[0046] J1, first connection terminal;

[0047] E1, first edge; E2, second edge; E3, third edge; E4, fourth edge;

[0048] X, first direction; Y, second direction; Z, thickness direction. DETAILED DESCRIPTION

[0049] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0051] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0052] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] 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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, 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 be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill 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.

[0057] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0058] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0059] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0060] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0061] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0062] Inside the battery, different battery cells can be connected in series or in parallel with each other through a busbar component. During the use of the battery, adjacent battery cells may be displaced due to factors such as vibration and collision, causing the busbar component to be subjected to pulling force. On this basis, if the busbar component is subjected to too much force, it is easy to cause some stress to act on the connection between the busbar component and the battery cell, resulting in structural failure at the battery cell or cracking or even fracture risk at the busbar component, affecting the reliability of the battery.

[0063] Based on the above technical problems, the present application provides a battery and an electrical device, wherein a collector component 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, wherein the plurality of buffer portions are spaced apart from each other, and extension directions of some structures in a single buffer portion are different, so that when the collector component is subjected to pulling action, the buffer portion can change its size in the second direction by deformation, thereby achieving buffering and absorption of the pulling force, reducing the risk of structural failure or cracking of the collector component and the battery cell, and improving the reliability of the battery.

[0064] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0065] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0066] See also Figure 1 , Figure 1A simple schematic diagram of a vehicle 1000 provided in an embodiment of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 may be provided inside the vehicle 1000, and specifically, for example, the battery 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used, for example, to control the battery to power the motor 300. The battery may be used for starting and navigating the vehicle 1000, and of course, the battery 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0067] Figure 2 Schematic diagram of an explosion of a battery provided in some embodiments of the present application. Figure 2 As shown, the battery 100 includes a housing 400 and a battery cell (not shown in the figure), and the battery cell is accommodated in the housing 400 .

[0068] The box 400 is used to accommodate the battery cells, and the box 400 can be a variety of structures. In some embodiments, the box 400 may include a first box portion 41 and a second box portion 42, the first box portion 41 and the second box portion 42 cover each other, and the first box portion 41 and the second box portion 42 jointly define a receiving portion 43 for accommodating the battery cells. The second box portion 42 may be a hollow structure with one end open, the first box portion 41 is a plate-like structure, and the first box portion 41 covers the open side of the second box portion 42 to form a box with a receiving portion 43; the first box portion 41 and the second box portion 42 may also be a hollow structure with one side open, and the open side of the first box portion 41 covers the open side of the second box portion 42 to form a box 400 with a receiving portion 43. Of course, the first box portion 41 and the second box portion 42 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0069] In the battery 100, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 400; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 400.

[0070] Next, the structure of the battery will be described in conjunction with the accompanying drawings. Figures 3 to 6The battery 100 includes a plurality of battery cells 10 and a current collecting member 20. The current collecting 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 respectively connected to different battery cells 10. The second direction Y is parallel to an arrangement direction of the plurality of battery cells 10. The first direction X intersects with the second direction Y.

[0071] The battery 100 at least includes a battery cell 10 and a current collecting member 20. The battery cell 10 is a main component for providing electric energy. A plurality of battery cells 10 are usually provided in the battery 100. These battery cells 10 can be arranged in a single direction or in an array in multiple directions. The battery cell 10 can have various forms, for example, the battery cell 10 can be cylindrical, flat, rectangular or other shapes.

[0072] The current collecting member 20 is used to realize the electrical connection between multiple battery cells 10. Specifically, the current collecting member 20 includes a first connection portion 21, a buffer portion 23 and a second connection portion 22 arranged in sequence in the second direction Y, and the first connection portion 21 and the second connection portion 22 are respectively connected to different battery cells 10. Among them, each battery cell 10 may include a first pole and a second pole with opposite polarities, and the first pole and the second pole are respectively the positive pole and the negative pole of the battery cell 10. On this basis, the first connection portion 21 and the second connection portion 22 in at least part of the current collecting member 20 can be respectively connected to the first pole of different battery cells 10 to realize the parallel connection between different battery cells 10. Or the first connection portion 21 in at least part of the current collecting member 20 is connected to the first pole of the battery cell 10, and the second connection portion 22 is connected to the second pole of other battery cells 10 to realize the series connection between different battery cells 10.

[0073] The first connection part 21, the buffer part 23 and the second connection part 22 are electrically connected to each other. The three may include the same material and be formed together in the same preparation process, or the three may include different materials and be formed separately in different preparation processes, and then be fixed relative to each other through other processes. Among them, the two ends of the buffer part 23 in the second direction Y may be directly connected to the first connection part 21 and the second connection part 22, or at least one of the first connection part 21 and the second connection part 22 and the buffer part 23 may be provided with other connection structures, as long as the first connection part 21, the second connection part 22 and the buffer part 23 in the current collecting component 20 are relatively fixed and can be electrically connected to each other.

[0074] The conduit member 20 includes a plurality of buffer portions 23, which are arranged at intervals in the first direction X. Optionally, the first direction X and the second direction Y are perpendicular to each other. In the related art, there is usually only one block structure between the first connection portion 21 and the second connection portion 22. In the embodiment of the present application, for example, a hole-shaped structure can be formed between the first connection portion 21 and the second connection portion 22 through a hole-shaped process, which is arranged along the thickness direction Z of the conduit member 20. The number of hole-shaped structures can be one or more. On this basis, the partial structure of the conduit member 20 located in the first connection portion 21 and the second connection portion 22 can be divided into a plurality of buffer portions 23 arranged at intervals by the hole-shaped structure. Compared with the block structure in the related art, the width of a single buffer portion 23 is smaller, so that the buffer portion 23 is easily deformed under the action of external force. Optionally, the buffer portion 23 can be a strip-shaped structure.

[0075] Further, no other structure may be provided between adjacent buffering parts 23, or a structure capable of deformation may be provided between adjacent buffering parts 23. Taking the example of other structures provided between adjacent buffering parts 23, for example, a structure such as rubber may be provided between adjacent buffering parts 23 to meet the deformation requirement. Alternatively, the structure between adjacent buffering parts 23 includes the same material as the buffering part 23, but its corresponding thickness dimension is smaller than the corresponding thickness dimension of the buffering part 23, so as to meet the deformation requirement.

[0076] In summary, in the embodiment of the present application, the current collecting member 20 located between the first connection portion 21 and the second connection portion 22 can include a plurality of buffer portions 23 arranged at intervals, and the width of a single buffer portion 23 is small, so that the buffer portion 23 is more likely to deform under the action of an external force. In this way, the stretching or contraction of the buffer portion 23 in the second direction Y can absorb part of the external force, achieve stress release, and improve the reliability of the battery.

[0077] It should be noted that the battery cell 10 may include a variety of component structures, and there may be a variety of connection methods between the battery cell 10 and the current collecting member 20. For example, the battery cell 10 may include a housing 11, an electrode assembly 14 located in the housing 11, and an electrode terminal 12 disposed on the housing 11, and the electrode terminal 12 is electrically connected to the electrode assembly 14. In this case, the electrode terminals 12 on different battery cells 10 may be connected and fixed to the first connection portion 21 or the second connection portion 22 on the current collecting member 20 by welding. Further, the embodiment of the present application provides a plurality of buffer portions 23 in the current collecting member 20, so as to achieve stress release by deformation of the buffer portions 23, thereby reducing the risk of stress concentration at the electrode terminal 12, the first connection portion 21, the second connection portion 22, and the connection position of the electrode terminal 12 relative to the first connection portion 21 or the second connection portion 22, reducing the risk of failure of the electrode terminal 12 and cracking of the current collecting member 20, and improving the reliability of the battery 100.

[0078] The housing 11 may have various forms. In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a sealed structure, the housing 11 may protect the electrode assembly 14 and prevent leakage of electrolyte. When the housing 11 is a non-sealed structure, the housing 11 may protect the electrode assembly 14. A sealing bag may be included between the housing 11 and the electrode assembly 14, and the sealing bag is used to encapsulate the electrode assembly 14 and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film.

[0079] In some embodiments, the buffer portion 23 includes a first sub-segment 231 and a second sub-segment 232 connected to each other, and the extension directions of the first sub-segment 231 and the second sub-segment 232 intersect with each other.

[0080] The buffer portion 23 includes a first sub-segment 231 and a second sub-segment 232 whose extension directions intersect. Compared with a solution in which the buffer portion 23 is a single straight line structure, this design can make it easier for the connection position between the first sub-segment 231 and the second sub-segment 232 to be displaced by an external force, thereby changing the length of the buffer portion 23 in the second direction Y. Further, by means of the stretching or contraction of the buffer portion 23 in the second direction Y, part of the external force can be absorbed, thereby achieving a stress release effect.

[0081] It should be noted that the first sub-segment 231 and the second sub-segment 232 may be in a straight line structure, that is, each position of the first sub-segment 231 extends in the same direction, and each position of the second sub-segment 232 extends in the same direction. Alternatively, the first sub-segment 231 and the second sub-segment 232 may also be in other structures such as arcs. On this basis, the extension direction of the first sub-segment 231 refers to the direction of the extension trend of the first sub-segment 231 as a whole.

[0082] Furthermore, the extension direction of the first sub-segment 231 and the extension direction of the second sub-segment 232 can have various forms, for example, the extension direction of the first sub-segment 231 can intersect with the first direction X and the second direction Y, or the extension direction of the first sub-segment 231, the first direction X and the second direction Y can be parallel to the same plane, and the second sub-segment 232 is the same. Further, when the first direction X, the second direction Y, the extension direction of the first sub-segment 231 and the extension direction of the second sub-segment 232 are all parallel to the same plane, it indicates that the buffer portion 23 does not protrude or protrudes to a small extent in the thickness direction Z of the current collecting member, which helps to reduce the impact 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-segment 231 and the second sub-segment 232, or the buffer portion 23 can also include other sub-segments that intersect with the extension directions of the first sub-segment 231 and the second sub-segment 232.

[0083] In the embodiment of the present application, the buffer portion 23 is provided with a first sub-segment 231 and a second sub-segment 232 whose extension directions intersect, so that the buffer portion 23 can be stretched or compressed under the action of a pulling force, and absorb part of the external force, thereby achieving a stress release function, reducing the risk of structural failure or cracking of the collector component 20 and the battery cell 10, and improving the reliability of the battery 100.

[0084] In some embodiments, the battery cell 10 has a first edge E1 and a second edge E2 opposite to each other in the first direction X. In the first direction X, the distance between the first connection portion 21 and the first edge E1 is smaller than the distance between the first connection portion 21 and the second edge E2.

[0085] In at least part of the buffer portion 23, in a direction parallel to the second direction Y and pointing from the first sub-segment 231 to the second sub-segment 232, the distance between the first sub-segment 231 and the second edge E2 in the first direction X gradually increases, and the distance between the second sub-segment 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 a direction parallel to the second direction Y and pointing from the first sub-segment 231 to the second sub-segment 232, the distance between the first sub-segment 231 and the second edge E2 in the first direction X gradually decreases, and the distance between the second sub-segment 232 and the second edge E2 in the first direction X gradually increases.

[0086] The battery cell 10 has two opposite edges, namely, a first edge E1 and a second edge E2, in the first direction X. Optionally, the battery cell 10 may include a housing 11, and the first edge E1 and the second edge E2 may be two opposite edges on the housing 11. In the first direction X, the first connection portion 21 and the second connection portion 22 are arranged within the first edge E1 and the second edge E2. The first connection portion 21 is closer to the first edge E1 than the second edge E2.

[0087] In at least part of the buffer portion 23, in the direction from the first sub-segment 231 to the second sub-segment 232, the first sub-segment 231 extends in the direction away from the second edge E2, and the second sub-segment 232 extends in the direction close to the second edge E2. In other words, the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 will protrude in the direction away from the second edge E2. In this case, the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 can have a certain size in both the first direction X and the second direction Y, so that under the pulling action of an external force, the buffer portion 23 can be compressed or elongated in the second direction Y by changing the size of the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 in the first direction X, thereby achieving the function of stress absorption and release.

[0088] Similarly, if Figure 4 and Figure 5 As shown, in at least part of the buffer portion 23, in the direction from the first sub-segment 231 to the second sub-segment 232, the first sub-segment 231 extends in the direction close to the second edge E2, and the second sub-segment 232 extends in the direction away from the second edge E2. In other words, the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 will protrude in the direction close to the second edge E2. In this case, the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 can have a certain size in both the first direction X and the second direction Y, so that under the pulling action of external force, the buffer portion 23 can be compressed or elongated in the second direction Y by changing the size of the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 in the first direction X, thereby realizing the function of stress absorption and release.

[0089] It should be noted that the plurality of buffer portions 23 are usually located on the side of the second edge E2 facing the first edge E1, and the buffer portion 23 and the first edge E1 may have a variety of 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 mode of each buffer portion 23 may be the same or similar, or the extension mode corresponding to at least some of the buffer portions 23 may also be different, as long as there are different sub-segments with intersecting extension directions in a single buffer portion 23.

[0090] In summary, in the embodiment of the present application, by setting the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 to protrude in the direction close to or away from the second edge E2, the buffer portion 23 can have a certain size in both the first direction X and the second direction Y. Furthermore, by changing the size of the buffer portion 23 in the first direction X, the buffer portion 23 can be extended or compressed in the second direction Y, thereby achieving the functions of stress absorption and release, and improving the reliability of the battery 100.

[0091] In some embodiments, Figure 4 and Figure 5 As shown, the first connection portion 21 has a third edge E3 in the first direction X, and at least a portion of the buffer portion 23 is disposed in the first direction X beyond the third edge E3.

[0092] The third edge E3 is an edge of the first connection portion 21 in the first direction X, wherein the third edge E3 may be located on a side of the first connection portion 21 facing the first edge E1 , or may be located on a side of the first connection portion 21 facing the second edge E2 .

[0093] In the embodiment of the present application, at least part of the buffer portion 23 is arranged beyond the third edge E3 in the first direction X, that is, at least part of the buffer portion 23 is 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 to make the buffer portion 23 have a larger size in the first direction X, so that the buffer portion 23 can have a larger deformation margin in the first direction X, thereby improving the compression and deformation capacity 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 cell 10 and the collector member 20, and improving the reliability of the battery 100.

[0094] In addition to the third edge E3, the first connection portion 21 also includes a fourth edge E4 opposite to the third edge E3 in the first direction X, wherein at least part of the buffer portion 23 can be arranged beyond the fourth edge E4 in the first direction X, that is, both sides of multiple buffer portions 23 in the first direction X can exceed the first connection portion 21, or all buffer portions 23 in the first direction X can also be located between the third edge E3 and the fourth edge E4. On this basis, the size of the whole composed of all buffer portions 23 in the first direction X can be greater than, less than or equal to the size of the first connection portion 21 in the first direction X.

[0095] In some embodiments, Figure 4 and Figure 5 As shown, in the first direction X, the plurality of buffer portions 23 are arranged not beyond the battery cell 10. That is, the plurality of buffer portions 23 in the current collecting member 20 are all located between the first edge E1 and the second edge E2.

[0096] In combination with the above content, it can be known that the battery includes a plurality of battery cells 10, and the plurality of battery cells 10 can be arranged in a single direction or in an array in multiple directions. In addition to the plurality of battery cells 10, the battery also includes a variety of other component structures, such as heat exchange components and side beam structures.

[0097] Furthermore, the embodiment of the present application limits the position of the buffer portion 23 and the corresponding battery cell 10, so that in the first direction X, the multiple buffer portions 23 are not arranged beyond the battery cell 10, thereby reducing the risk of the buffer portion 23 overlapping with other battery cells 10 or other component structures in the thickness direction Z of the convergence member 20. In other words, this design can reduce the risk of interference and overlap between the buffer portion 23 and other structures, thereby improving the structural reliability of the buffer portion 23.

[0098] In some embodiments, Figure 4 and Figure 5 As shown, the battery cell 10 also includes a pressure relief mechanism 13, which is spaced apart from the plurality of buffers 23 in the first direction X, i.e., a projection of the pressure relief mechanism 13 in the thickness direction Z of the current collecting member 20 is outside the projection of the plurality of buffers 23 in the thickness direction Z of the current collecting member 20.

[0099] The pressure relief mechanism 13 refers to an element or component that is activated to release the internal pressure or temperature of the battery cell 10 when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and separator in the battery cell 10. The internal pressure of the battery cell 10 is the pressure inside the housing 11.

[0100] The pressure relief mechanism 13 may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically be a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism 13 performs an action or an actuating portion provided in the pressure relief mechanism 13 ruptures, thereby forming an opening or channel for the internal pressure to be released. The actuating portion may be formed by providing notches, grooves or a material with relatively low strength.

[0101] The "actuation" mentioned in this application means that the pressure relief mechanism 13 is in action or activated to a certain state, so that the internal pressure of the battery cell 10 can be released. The action produced by the pressure relief mechanism 13 may include but is not limited to: at least a part of the pressure relief mechanism 13 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 13 is actuated, the high-temperature and high-pressure substances inside the battery cell 10 will be discharged from the actuated part as emissions. In this way, the battery cell 10 can be depressurized under controllable pressure, thereby avoiding potential more serious accidents to a certain extent.

[0102] The emissions from the battery cells 10 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, and the like.

[0103] In the embodiment of the present application, the pressure relief mechanism 13 and the plurality of buffer portions 23 are spaced apart in the first direction X so that the buffer portions 23 do not cover the pressure relief mechanism 13 , thereby reducing the influence of the buffer portions 23 on the pressure relief function of the pressure relief mechanism 13 and improving the corresponding pressure relief reliability of the battery cell 10 .

[0104] In some embodiments, see Figure 7 and Figure 8 The plurality of buffer portions 23 include 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 close to the second edge E2. In the first buffer portion 23a, in a direction parallel to the second direction Y and pointing from the first sub-segment 231 to the second sub-segment 232, the distance between the first sub-segment 231 and the second edge E2 in the first direction X gradually decreases, and the distance between the second sub-segment 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 pointing from the first sub-segment 231 to the second sub-segment 232, the distance between the first sub-segment 231 and the second edge E2 in the first direction X gradually increases, and the distance between the second sub-segment 232 and the second edge E2 in the first direction X gradually decreases.

[0105] The plurality of buffers 23 include at least two types of buffers 23, namely, a first buffer 23a and a second buffer 23b, and the extension forms of the first buffer 23a and the second buffer 23b are different. Specifically, the first buffer 23a is closer to the second edge E2 than the second buffer 23b, and the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 in the first buffer 23a can protrude in the direction close to the second edge E2, while the fold line or curve structure formed by the first sub-segment 231 and the second sub-segment 232 in the second buffer 23b can protrude in the direction away from the second edge E2. Further optionally, the first buffer 23a and the second buffer 23b are symmetrically arranged relative to a virtual straight line parallel to the second direction Y.

[0106] In the embodiment of the present application, the plurality of buffers 23 can include first buffers 23a and second buffers 23b of different extension forms, and at least a portion of the structure of the first buffer 23a relatively close to the second edge E2 can protrude in a direction close to the second edge E2, and at least a portion of the structure of the second buffer 23b relatively far from the second edge E2 can protrude in a direction far from the second edge E2. Under this design, when the buffer 23 is pulled by an external force, the movement trend of a portion of the structure in the first buffer 23a and a portion of the structure in the second buffer 23b in the first direction X is opposite, so as to help make the force on the converging member 20 in the first direction X symmetrical and uniform, and further improve reliability.

[0107] In some embodiments, see Fig. 9 The buffer portion 23 includes a first connection end J1 connected to the first connection portion 21 , and a portion of the structure in the buffer portion 23 is protruded in the thickness direction Z of the current collecting component 20 relative to the first connection end J1 .

[0108] The first connection end J1 is an end of the buffer portion 23 for connecting to the first connection portion 21. The first connection end J1 is usually located at the same height as the first connection portion 21 in the thickness direction Z of the current collecting member 20. Some structures in the buffer portion 23 are protruded in the thickness direction Z of the current collecting member 20 relative to the first connection end J1, that is, some structures in the buffer portion 23 may have certain undulations in the thickness direction Z of the current collecting member 20. In the thickness direction Z of the current collecting member 20, some structures in the buffer portion 23 may protrude in the direction close to the battery cell 10, or some structures in the buffer portion 23 may protrude in the direction away from the battery cell 10.

[0109] In the embodiment of the present application, by setting part of the structure in the buffer portion 23 to be able to deform in the thickness direction Z of the conduit component 20, the buffer portion 23 can also be deformed in the thickness direction Z of the conduit component 20, thereby improving the buffer portion 23's ability to absorb external stress, thereby further improving the corresponding use reliability of the battery 100.

[0110] Similarly, in some optional embodiments, the buffer portion 23 includes a second connection end connected to the second connection portion 22, and at least a portion of the structure in the buffer portion 23 is protruded relative to the second connection end in the thickness direction Z of the current collecting component.

[0111] In some embodiments, see Fig.10 In the thickness direction Z of the busbar, the size of the buffer portion 23 is larger than the size of the first connecting portion 21 .

[0112] It can be seen from the foregoing that the embodiment of the present application can form a hole-like structure between the first connecting portion 21 and the second connecting portion 22 through a hole-digging process. The hole-like structure can separate adjacent buffer portions 23 and make the buffer portion 23 have a smaller width dimension, so that under the action of external force, the buffer portion 23 can be deformed and absorb part of the stress, thereby improving the reliability of the battery 100.

[0113] On this basis, in order to reduce the resistance value corresponding to the buffer portion 23, the embodiment of the present application adjusts the size of the buffer portion 23 in the thickness direction Z of the current collecting member 20. 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. The resistance of the buffer portion 23 is usually negatively correlated with the thickness dimension of the buffer portion 23 and negatively correlated with the width dimension of the buffer portion 23. On this basis, the embodiment of the present application reduces the width dimension corresponding to a single buffer portion 23 and increases the thickness dimension 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 have a smaller resistance value while meeting the deformation requirements, thereby improving the reliability of the electrical connection between multiple battery cells 10.

[0114] It should be noted that, since the size of the buffer portion 23 is larger than the size of the first connection portion 21 in the thickness direction Z of the current collector, the buffer portion 23 may protrude relative to the first connection portion 21 in the thickness direction Z of the current collector. Further, the buffer portion 23 may protrude only from the surface of the first connection portion 21 facing the battery cell 10, or the buffer portion 23 may protrude only from the surface of the first connection portion 21 facing away from the battery cell 10, or the buffer portion 23 may protrude both from the surface of the first connection portion 21 facing the battery cell 10 and from the surface of the first connection portion 21 away from the battery cell 10.

[0115] Similarly, in some optional embodiments, in the thickness direction Z of the busbar, the size of the buffer portion 23 is larger than the size of the second connecting portion 22 .

[0116] In some embodiments, the battery cell 10 includes a first wall 111 and an electrode terminal 12 disposed on the first wall 111 , the current collecting member 20 is disposed on one side of the first wall 111 , and the buffer portion 23 is spaced apart from the first wall 111 in the thickness direction Z of the current collecting member 20 .

[0117] The electrode terminal 12 is a component for realizing the transmission of electric energy inside and outside the battery cell 10. Exemplarily, the battery cell 10 includes a housing 11 and an electrode assembly 14 disposed in the housing 11. The housing 11 includes a first wall 111. The electrode terminal 12 is disposed on the first wall 111 and is electrically connected to the electrode assembly 14 and the current collecting member 20. Optionally, the electrode terminal 12 can be electrically connected to the current collecting member 20 by welding.

[0118] 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, and the end cover includes the first wall 111. Although the electrode terminal 12 is arranged on the first wall 111, an insulating member exists between the electrode terminal 12 and the first wall 111 to insulate the electrode terminal 12 from the first wall 111. Further, the current collecting member 20 is also insulated from the first wall 111.

[0119] In the embodiment of the present application, in order to reduce the risk of electrical conduction between the collector component 20 and the first wall 111, the buffer portion 23 in the collector component 20 is arranged to be spaced apart from the first wall 111 in the thickness direction Z of the collector component 20, thereby reducing the risk of contact between the buffer portion 23 and the first wall 111 and improving the reliability of electrical connection between different battery cells 10.

[0120] In some embodiments, in the thickness direction Z of the current collecting member 20 , the minimum distance between the buffer portion 23 and the first wall 111 is D, and D satisfies: D≥0.3 mm. Alternatively, D may be one of 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, and 5 mm.

[0121] In the embodiment of the present application, the minimum distance between the buffer portion 23 and the first wall 111 on the collector component 20 is set to be no less than 0.3 mm, thereby reducing the risk of contact between the buffer portion 23 and the first wall 111 due to external impact and the like, thereby reducing the risk of conduction between the electrode terminal 12 and the first wall 111, and improving the reliability of the electrical connection between different battery cells 10.

[0122] In a third aspect, an embodiment of the present application provides an electrical device, which includes the battery 100 in any of the aforementioned embodiments.

[0123] It should be noted that the electrical device provided in the embodiment of the present application has the beneficial effects of the battery 100 in any of the aforementioned embodiments. For details, please refer to the aforementioned description of the beneficial effects of the battery 100, and the embodiment of the present application will not be repeated here.

[0124] According to some embodiments of the present application, please refer to Figure 7 , Figure 8 as well as Fig.10 The battery 100 includes a plurality of battery cells 10 and a current collecting member 20. The battery cells 10 include a first wall 111, a pressure relief mechanism 13, and an electrode terminal 12 disposed on the first wall 111. The current collecting member 20 includes a first connection portion 21, a second connection portion 22, and a plurality of buffer portions 23 located between the first connection portion 21 and the second connection portion 22 along a second direction Y. The plurality of buffer portions 23 are arranged at intervals along a first direction X. The first connection portion 21 and the second connection portion 22 are respectively connected to the electrode assemblies 14 of different battery cells 10. The buffer portion 23 includes a first subsection 231 and a second subsection 232. The first direction X intersects with the second direction Y.

[0125] The battery cell 10 has a first edge E1 and a second edge E2 opposite to each other in the first direction X. In the first direction X, the distance between the first connection portion 21 and the first edge E1 is smaller than the distance between the first connection portion 21 and the second edge E2. The plurality of buffer portions 23 include 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 close to the second edge E2. In the first buffer portion 23a, in a direction parallel to the second direction Y and pointing from the first sub-segment 231 to the second sub-segment 232, the distance between the first sub-segment 231 and the second edge E2 in the first direction X gradually decreases, and the distance between the second sub-segment 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 pointing from the first sub-segment 231 to the second sub-segment 232, the distance between the first sub-segment 231 and the second edge E2 in the first direction X gradually increases, and the distance between the second sub-segment 232 and the second edge E2 in the first direction X gradually decreases.

[0126] The first connection portion 21 has a third edge E3 in the first direction X, at least part of the buffer portion 23 is arranged beyond the third edge E3 in the first direction X, and in the first direction X, the plurality of buffer portions 23 are arranged without exceeding the electrode monomer, and the pressure relief structure and the plurality of buffer portions 23 are arranged at intervals in the first direction X. In the thickness direction Z of the current collecting member 20, the size of the buffer portion 23 is larger than the size of the first connection portion 21, and the buffer portion 23 is arranged at intervals from the first wall 111.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: Multiple battery cells; A current collecting component, the current collecting component comprising a first connecting portion, a second connecting portion, and A plurality of buffer portions, the plurality of buffer portions are at least partially spaced apart along the first direction and are located between the first connecting portion and the second connecting portion in the second direction, the first connecting portion and the second connecting portion are respectively connected to different battery cells; The second direction is parallel to an arrangement direction of the plurality of battery cells, and the first direction intersects with the second direction.

2. The battery according to claim 1, characterized in that The buffer portion includes a first sub-segment and a second sub-segment connected to each other, wherein the extension directions of the first sub-segment intersect with the extension directions of the second sub-segment.

3. The battery according to claim 2, characterized in that The battery cell has a first edge and a second edge opposite to each other in the first direction, and in the first direction, a distance between the first connection portion and the first edge is smaller than a distance between the first connection portion and the second edge; In at least part of the buffer portion, in a direction parallel to the second direction and pointing from the first subsegment to the second subsegment, the distance between the first subsegment and the second edge in the first direction gradually increases, and the distance between the second subsegment and the second edge in the first direction gradually decreases; and / or, In at least part of the buffer portion, in a direction parallel to the second direction and pointing from the first subsegment to the second subsegment, the distance between the first subsegment and the second edge in the first direction gradually decreases, and the distance between the second subsegment and the second edge in the first direction gradually increases.

4. The battery according to claim 3, characterized in that The first connecting portion has a third edge in the first direction, and at least a portion of the buffer portion is disposed beyond the third edge in the first direction.

5. The battery according to claim 4, characterized in that In the first direction, the plurality of buffer portions are disposed so as not to exceed the battery cells.

6. The battery according to claim 3, characterized in that The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is spaced apart from the plurality of buffer portions in the first direction.

7. The battery according to claim 3, characterized in that The plurality of buffer portions include a first buffer portion and a second buffer portion, wherein the first buffer portion is located on a side of the second buffer portion close to the second edge; In the first buffer portion, in a direction parallel to the second direction and pointing from the first subsegment to the second subsegment, the distance between the first subsegment and the second edge in the first direction gradually decreases, and the distance between the second subsegment and the second edge in the first direction gradually increases; In the second buffer portion, in a direction parallel to the second direction and pointing from the first subsegment to the second subsegment, the distance between the first subsegment and the second edge in the first direction gradually increases, and the distance between the second subsegment and the second edge in the first direction gradually decreases.

8. The battery according to claim 1, characterized in that The buffer portion includes a first connection end connected to the first connection portion, and a partial structure in the buffer portion is protruded relative to the first connection end in a thickness direction of the current collecting member.

9. The battery according to claim 1, characterized in that In a thickness direction of the current collecting member, a size of the buffer portion is larger than a size of the first connecting portion or a size of the second connecting portion.

10. The battery according to claim 1, characterized in that The battery cell includes a first wall and an electrode terminal disposed on the first wall. The current collecting member is disposed on one side of the first wall. In a thickness direction of the current collecting member, the buffer portion is spaced apart from the first wall.

11. The battery according to claim 10, characterized in that 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 electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 11, wherein the battery is used to provide electrical energy.

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