Battery cell and battery pack

Abstract

The application discloses a battery monomer and a battery pack. The battery monomer comprises a shell, a cavity in the shell, an electrode assembly in the cavity, a top cover assembly connected with the shell and covering the cavity, and a current collecting member between the electrode assembly and the top cover assembly. The current collecting member comprises a first connecting part and a second connecting part connected with each other, the first connecting part is electrically connected with the electrode assembly, the second connecting part is electrically connected with the top cover assembly, the first connecting part and the second connecting part are arranged in a first direction and form a first gap, and at least one of the first connecting part and the second connecting part is provided with a buffer part in the first gap. In this way, the electrode assembly can be buffered by the buffer part, the impact of the current collecting member on the electrode assembly can be avoided, the damage of the electrode assembly can be avoided, and the short circuit of the battery monomer can be avoided.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell and a battery pack. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] Existing batteries include a cover plate, electrode assemblies, a housing, and a current collector. The housing has a cavity in which the electrode assemblies are installed, and the cover plate seals the opening of the cavity. The cover plate has terminal posts, and the current collector is located between the terminal posts and the electrode assemblies, providing electrical connection. However, during battery use, due to the structural limitations of existing current collectors, the electrode assemblies can be damaged by impacts from the current collector, causing short circuits and affecting battery safety. Utility Model Content

[0004] This application aims to provide a battery cell and battery pack that can solve the problem that existing electrode components are damaged by the impact of current collectors, causing battery short circuits.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a battery cell having a first orientation, comprising: a housing having a receiving cavity; an electrode assembly disposed in the receiving cavity; a top cover assembly connected to the housing and covering the receiving cavity; and a current collector disposed between the electrode assembly and the top cover assembly, the current collector comprising a first connecting portion and a second connecting portion connected to each other, the first connecting portion being electrically connected to the electrode assembly, the second connecting portion being electrically connected to the top cover assembly, the first connecting portion and the second connecting portion being spaced apart in the first orientation and forming a first gap, at least one of the first connecting portion and the second connecting portion being provided with a buffer portion located within the first gap.

[0006] Optionally, the buffer portion includes a first protrusion and a second protrusion both located within the first gap; the first protrusion is disposed on the first connecting portion and protrudes toward one side of the second connecting portion; the second protrusion is disposed on the second connecting portion, the second protrusion is disposed opposite to the first protrusion and protrudes toward one side of the first connecting portion.

[0007] Optionally, a portion of the first connecting portion is recessed along the first direction toward one side of the second connecting portion to form the first protrusion; a portion of the second connecting portion is recessed along the first direction toward one side of the first connecting portion to form the second protrusion.

[0008] Optionally, the battery cell further has a second direction perpendicular to the first direction; the current collector further includes a transition portion extending along the second direction, the transition portion connecting the first connecting portion and the second connecting portion; the first protrusion and the second protrusion are both strip-shaped and extend along the second direction, and in the first direction, the first protrusion and the second protrusion abut against each other.

[0009] Optionally, the top cover assembly includes a top cover plate and an electrode post; the top cover plate is connected to the housing and seals the receiving cavity, the electrode post passes through the top cover plate, and the electrode post is electrically connected to the second connecting part; at least two buffer parts are provided; at least two buffer parts are provided in the circumference of the electrode post.

[0010] Optionally, the electrode post is provided with an injection hole that penetrates the electrode post along the first direction, and the first gap communicates with the receiving cavity; the second connecting portion is provided with a first liquid passage hole that penetrates the second connecting portion along the first direction and communicates with the injection hole and the first gap; and / or, the first connecting portion is provided with a second liquid passage hole that penetrates the first connecting portion along the first direction and communicates with the first gap and the receiving cavity; multiple second liquid passage holes are provided and spaced apart, and at least one second liquid passage hole is offset from the injection hole in the first direction.

[0011] Optionally, the electrode assembly includes a first tab, a second tab, and an electrode body, wherein the first tab and the second tab are electrically connected to opposite sides of the electrode body in the first direction; the electrode post is insulated from the top cover plate; the first tab is electrically connected to the first connecting portion; and the second tab is electrically connected to the housing.

[0012] Optionally, the first connecting part is an aluminum plate, and the current collecting component further includes a first copper plate, wherein in the first direction, the first copper plate is electrically connected to the side of the first connecting part facing the second connecting part; and / or, the second connecting part is an aluminum plate, and the current collecting component further includes a second copper plate, wherein in the first direction, the second copper plate is electrically connected to the side of the second connecting part facing the first connecting part.

[0013] Optionally, the battery cell further includes a buffer member disposed between the first connecting portion and the second connecting portion, and in the first direction, the buffer member abuts against the first connecting portion and the second connecting portion.

[0014] Secondly, embodiments of this application propose a battery pack comprising the battery cells described in the above embodiments.

[0015] In this embodiment, by placing the electrode assembly within the housing's receiving cavity, and connecting the top cover assembly to the housing to seal the receiving cavity, installation space is provided for the electrode assembly. Furthermore, the first connecting portion of the current collector is electrically connected to the electrode assembly, and the second connecting portion of the current collector is electrically connected to the top cover assembly. The first and second connecting portions are spaced apart in a first direction and form a first gap. At least one of the first and second connecting portions is provided with a buffer portion located within the first gap. Thus, the buffer portion can cushion the electrode assembly, preventing the current collector assembly from impacting the electrode assembly and causing damage, which could lead to a short circuit in the battery cell.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a cross-sectional view of a first type of battery cell according to an embodiment of this application; Figure 2 This is a schematic diagram of a current collection component according to a first embodiment of this application; Figure 3 This is another schematic diagram of a current collection component according to the first embodiment of this application; Figure 4 This is a side view of the current collection component according to a first embodiment of this application; Figure 5 This is a cross-sectional view of a second type of battery cell according to an embodiment of this application; Figure 6 This is a schematic diagram of a current collection component according to a second embodiment of this application; Figure 7 This is a side view of the current collection component according to a second embodiment of this application; Figure 8 This is a cross-sectional view of a third type of battery cell according to an embodiment of this application; Figure 9 This is a cross-sectional view of a fourth type of battery cell according to an embodiment of this application.

[0018] Figure label: 10. Shell; 11. Receiving cavity; 12. Second gap; 20. Electrode assembly; 21. First electrode tab; 22. Second electrode tab; 23. Electrode body; 30. Top cover assembly; 31. End post; 311. Injection port; 32. Top cover plate; 40. Flow collecting component; 41. First connecting part; 411. Second liquid passage hole; 42. Second connecting part; 421. First liquid passage hole; 43. Transition part; 44. First gap; 45. Buffer part; 451. First protrusion; 451a. First cavity; 452. Second protrusion; 452a. Second cavity; 46. First copper plate; 47. Second copper plate; 50. Buffer element; Z, first direction; X, second direction. Detailed Implementation

[0019] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] The battery cell and battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0024] like Figures 1 to 4 As shown in the embodiment of this application, a battery cell with a first direction Z is proposed, comprising: a housing 10 having a receiving cavity 11; an electrode assembly 20 disposed in the receiving cavity 11; a top cover assembly 30 connected to the housing 10 and sealing the receiving cavity 11; and a current collector 40 disposed between the electrode assembly 20 and the top cover assembly 30. The current collector 40 includes a first connecting portion 41 and a second connecting portion 42 connected to each other. The first connecting portion 41 is electrically connected to the electrode assembly 20, and the second connecting portion 42 is electrically connected to the top cover assembly 30. The first connecting portion 41 and the second connecting portion 42 are spaced apart in the first direction Z and form a first gap 44. At least one of the first connecting portion 41 and the second connecting portion 42 is provided with a buffer portion 45 located within the first gap 44. The first direction Z is the height direction of the battery cell.

[0025] In this embodiment, by placing the electrode assembly 20 within the receiving cavity 11 of the housing 10, and connecting the top cover assembly 30 to the housing 10 and sealing the receiving cavity 11, an installation space is provided for the electrode assembly 20. The first connecting portion 41 of the current collector 40 is electrically connected to the electrode assembly 20, and the second connecting portion 42 of the current collector 40 is electrically connected to the top cover assembly 30. The first connecting portion 41 and the second connecting portion 42 are spaced apart in the first direction Z and form a first gap 44. At least one of the first connecting portion 41 and the second connecting portion 42 is provided with a buffer portion 45, which is located within the first gap 44. The deformation of the buffer portion 45 buffers the electrode assembly 20, preventing the current collector 40 from impacting the electrode assembly 20 and causing damage to the electrode assembly 20, thus preventing a short circuit in the battery cell. Furthermore, the buffer portion 45 does not require additional space in the battery cell along the first direction Z, maintaining the compactness of the battery cell while achieving the buffering function, thereby improving the energy density of the battery cell.

[0026] Alternatively, the battery cell can be a cylindrical battery.

[0027] Furthermore, the buffer portion 45 is disposed within the first gap 44. In some embodiments, the current collector 40 is configured as an elastic element, and the first connecting portion 41 and the second connecting portion 42 of the current collector 40 can spring back after deformation. In this way, by utilizing the characteristics of elastic deformation, the assembly tolerances between the top cover assembly 30, the electrode assembly 20, and the current collector 40 can be absorbed, thereby improving the assembly yield.

[0028] Optionally, such as Figures 2 to 4 As shown, the buffer portion 45 includes a first protrusion 451 and a second protrusion 452 both located within the first gap 44; the first protrusion 451 is disposed on the first connecting portion 41 and protrudes towards the side of the second connecting portion 42; the second protrusion 452 is disposed on the second connecting portion 42, the second protrusion 452 is disposed opposite to the first protrusion 451 and protrudes towards the side of the first connecting portion 41.

[0029] In this embodiment, a first protrusion 451 is provided on the first connecting portion 41, protruding towards the side of the second connecting portion 42; a second protrusion 452 is provided on the second connecting portion 42, opposite to the first protrusion 451, and protruding towards the side of the first connecting portion 41. This allows for better cushioning through the coordinated deformation of the first and second protrusions 451. When subjected to external force, the second and first protrusions 452, being opposite to each other, can abut against each other, thus providing a cushioning effect.

[0030] In some embodiments, such as Figure 4 As shown, the first protrusion 451 and the second protrusion 452 can be arranged opposite to each other, that is, the orthographic projection of the first protrusion 451 along the first direction Z and the orthographic projection of the second protrusion 452 along the first direction Z at least partially overlap, so that the first protrusion 451 and the second protrusion 452 can contact each other to generate deformation, thereby achieving buffering.

[0031] Of course, in other embodiments, the orthographic projection of the first protrusion 451 along the first direction Z and the orthographic projection of the second protrusion 452 along the first direction Z are staggered. The first protrusion 451 abuts against the second connecting portion 42 in the first direction Z and achieves buffering, and the second protrusion 452 abuts against the first connecting portion 41 in the first direction Z and achieves buffering.

[0032] In some embodiments, a plurality of first protrusions 451 and a plurality of second protrusions 452 are provided. The plurality of first protrusions 451 are spaced apart on the first connecting portion 41, and the plurality of second protrusions 452 are spaced apart on the second protrusions 452. Each first protrusion 451 corresponds to one second protrusion 452.

[0033] In some embodiments, such as Figure 2 and Figure 3 As shown, the first protrusion 451 has a first cavity 451a and the second protrusion 452 has a second cavity 452a, so that the first protrusion 451 and the second protrusion 452 are hollow structures. The deformation of the hollow structure is more conducive to absorbing energy, thereby achieving a buffering effect.

[0034] Optionally, such as Figures 5 to 7 As shown, a portion of the first connecting portion 41 is recessed along the first direction Z toward the side of the second connecting portion 42 to form a first protrusion 451; a portion of the second connecting portion 42 is recessed along the first direction Z toward the side of the first connecting portion 41 to form a second protrusion 452.

[0035] In this embodiment, a first protrusion 451 is formed by recessing a portion of the first connecting portion 41 toward the side of the second connecting portion 42 along the first direction Z, and a second protrusion 452 is formed by recessing a portion of the second connecting portion 42 toward the side of the first connecting portion 41 along the first direction Z. Thus, the recessed first protrusion 451 and the second protrusion 452 can evenly distribute the impact force on the current collecting member 40, thereby avoiding stress concentration.

[0036] In some embodiments, the first protrusion 451 and the second protrusion 452 are configured as arc-shaped structures, and different requirements for the battery cell are achieved by controlling the curvature of the first protrusion 451 and the second protrusion 452.

[0037] Optionally, such as Figure 7 As shown, the battery cell also has a second direction X perpendicular to the first direction Z; the current collector 40 further includes a transition portion 43 extending along the second direction X, the transition portion 43 connecting the first connecting portion 41 and the second connecting portion 42; the first protrusion 451 and the second protrusion 452 are both strip-shaped and extend along the second direction X, and in the first direction Z, the first protrusion 451 and the second protrusion 452 abut against each other. The second direction X is the radial direction of the battery cell.

[0038] In this embodiment, the first connecting portion 41 and the second connecting portion 42 are connected by the transition portion 43, and the first protrusion 451 and the second protrusion 452 are arranged in a strip shape and extend along the second direction X and abut against each other. In this way, a linear or narrow surface contact is formed between the first protrusion 451 and the second protrusion 452. When subjected to an impact in the first direction Z, it can provide uniform support force and quickly disperse the impact stress along the strip structure, thereby avoiding stress concentration.

[0039] In some embodiments, the transition portion 43, the first connecting portion 41, and the second connecting portion 42 can be integrally formed to improve the overall strength of the current collection member 40.

[0040] Optionally, such as Figures 1 to 3 As shown, the top cover assembly 30 includes a top cover plate 32 and a pole post 31; the top cover plate 32 is connected to the housing 10 and covers the receiving cavity 11, the pole post 31 passes through the top cover plate 32, and the pole post 31 is electrically connected to the second connecting part 42; at least two buffer parts 45 are provided; at least two buffer parts 45 are provided in the circumference of the pole post 31.

[0041] In this embodiment, the top cover 32 is connected to the housing 10 and seals the receiving cavity 11. The pole post 31 passes through the top cover 32 and is electrically connected to the second connecting part 42. At least two buffer parts 45 are provided around the pole post 31. This allows the current collecting member 40 around the pole post 31 to be buffered by the at least two buffer parts 45, thereby specifically strengthening the local impact resistance of the current collecting member 40.

[0042] In some embodiments, there may be two or more buffer portions 45. If there are only two buffer portions 45, they may be spaced apart in the circumferential direction of the pole post 31. If there are three or more buffer portions 45, they may be spaced apart in the circumferential direction around the pole post 31.

[0043] Specifically, although the pole post 31 is inserted into the top cover plate 32, under the action of external force, the pole post 31 and the top cover plate 32 may still loosen or even separate, which causes the external force to act on the second connecting part 42 through the displacement of the pole post 31, making the second connecting part 42 more susceptible to external impact.

[0044] Optionally, such as Figures 1 to 3 As shown, the electrode post 31 is provided with a liquid injection hole 311, which penetrates the electrode post 31 along the first direction Z, and the first gap 44 is connected to the receiving cavity 11; the second connecting part 42 is provided with a first liquid passage hole 421, which penetrates the second connecting part 42 along the first direction Z, and the first liquid passage hole 421 connects the liquid injection hole 311 and the first gap 44.

[0045] In this embodiment of the application, by connecting the first liquid passage hole 421 of the second connection part 42 to the liquid injection hole 311 of the electrode post 31 and the first gap 44, the electrolyte can be uniformly and rapidly diffused into the peripheral area of ​​the electrode assembly 20 by sequentially passing through the liquid injection hole 311, the first liquid passage hole 421 and the first gap 44, thereby facilitating the liquid injection of the electrolyte.

[0046] Optionally, such as Figures 1 to 3 as well as Figure 6As shown, the first connecting part 41 is provided with a second liquid passage hole 411, which penetrates the first connecting part 41 along the first direction Z and connects the first gap 44 and the receiving cavity 11. Multiple second liquid passage holes 411 are provided and spaced apart, and at least one second liquid passage hole 411 is offset from the injection hole 311 in the first direction Z.

[0047] In this embodiment, by spaced apart, the electrolyte can be uniformly permeated into the electrode assembly 20 through the multiple second liquid passage holes 411, thereby improving the wetting uniformity. In addition, the multiple second liquid passage holes 411 can accelerate the speed at which the electrolyte permeates into the electrode assembly 20, thereby improving the injection efficiency. In this application, at least one second liquid passage hole 411 is staggered from the injection hole 311 in the first direction Z, avoiding the electrolyte from directly impacting the surface of the electrode assembly 20 from the injection hole 311, reducing damage to the active layer on the surface of the electrode assembly 20, and protecting the integrity of the electrode assembly 20.

[0048] In some embodiments, each second liquid passage 411 may be configured to be offset from the liquid injection hole 311 in the first direction Z, thereby further protecting the electrode assembly 20.

[0049] Optionally, such as Figure 1 and Figure 5 As shown, the electrode assembly 20 includes a first tab 21, a second tab 22, and an electrode body 23. The first tab 21 and the second tab 22 are electrically connected to opposite sides of the electrode body 23 in the first direction Z. The electrode post 31 is insulated from the top cover plate 32. The first tab 21 is electrically connected to the first connecting part 41, and the second tab 22 is electrically connected to the housing 10.

[0050] In this embodiment, the first tab 21 of the electrode assembly 20 is electrically connected to the first connecting portion 41, and the second tab 22 of the electrode assembly 20 is electrically connected to the housing 10. This facilitates the formation of a series internal current path: electrode post 31 - first tab 21 - electrode body 23 - second tab 22 - housing 10, thereby supplying power to the electrical device. Furthermore, by directly connecting the second tab 22 to the housing 10, it is beneficial to transfer the heat generated by the electrode assembly 20 to the housing 10 through the second tab 22, improving heat dissipation efficiency.

[0051] It should be noted that the first electrode 21 is the positive electrode and the second electrode 22 is the negative electrode; of course, the first electrode 21 can also be the negative electrode and the second electrode 22 can be the positive electrode, and this application embodiment does not limit this.

[0052] Optionally, such as Figure 7As shown, the first connecting part 41 is an aluminum plate, and the current collecting component 40 also includes a first copper plate 46. In the first direction Z, the first copper plate 46 is electrically connected to the side of the first connecting part 41 facing the second connecting part 42.

[0053] In this embodiment, by electrically connecting the first copper plate 46 to the side of the first connection portion 41 facing the second connection portion 42, the current-carrying capacity of the current collector 40 in the second connection portion 42 is improved by the more conductive first copper plate 46, thereby increasing the discharge rate of the battery cell.

[0054] Optionally, such as Figure 7 As shown, the second connecting part 42 is an aluminum plate, and the current collecting member 40 also includes a second copper plate 47. In the first direction Z, the second copper plate 47 is electrically connected to the side of the second connecting part 42 facing the first connecting part 41.

[0055] In this embodiment, by electrically connecting the second copper plate 47 to the side of the second connection portion 42 facing the first connection portion 41, the current-carrying capacity of the current collector 40 in the first connection portion 41 is improved by the more conductive second copper plate 47, thereby increasing the discharge rate of the battery cell.

[0056] In some embodiments, the second copper plate 47 and the second connecting portion 42 can be connected by welding, or the aluminum plate can be coated with copper powder, electroplated with copper, etc. to form the second copper plate 47; the connection between the first copper plate 46 and the first connecting portion 41 is the same as the connection between the second copper plate 47 and the second connecting portion 42, and will not be described again in the embodiments of this application.

[0057] Optionally, such as Figure 8 As shown, the battery cell also includes a buffer 50, which is disposed between the first connecting portion 41 and the second connecting portion 42, and in the first direction Z, the buffer 50 abuts against the first connecting portion 41 and the second connecting portion 42.

[0058] In this embodiment of the application, by placing the buffer 50 between the first connecting portion 41 and the second connecting portion 42, and by abutting the buffer 50 against the first connecting portion 41 and the second connecting portion 42, the buffer 50 can absorb external force deformation and thus provide a buffering effect.

[0059] In some embodiments, the buffer 50 may be provided with a ring structure, a rectangular structure, an arc structure, etc., and the embodiments of this application do not limit this.

[0060] In other embodiments, such as Figure 7 and Figure 9As shown, there is a second gap 12 between the top cover and the first connecting part 41 of the flow collecting member 40. The buffer member 50 is disposed in the second gap 12 and is arranged around the flow collecting member 40. One side of the buffer member 50 abuts against the top cover, and the other side of the buffer member 50 abuts against the first connecting part 41 of the flow collecting member 40, thereby realizing the buffer between the top cover and the flow collecting member 40.

[0061] Optionally, embodiments of this application propose a battery pack including the battery cells described in the above embodiments.

[0062] In this embodiment, by placing the electrode assembly 20 within the receiving cavity 11 of the housing 10, and connecting the top cover assembly 30 to the housing 10 and sealing the receiving cavity 11, an installation space is provided for the electrode assembly 20. The first connecting portion 41 of the current collector 40 is electrically connected to the electrode assembly 20, and the second connecting portion 42 of the current collector 40 is electrically connected to the top cover assembly 30. The first connecting portion 41 and the second connecting portion 42 are spaced apart in the first direction Z and form a first gap 44. At least one of the first connecting portion 41 and the second connecting portion 42 is provided with a buffer portion 45, which is located within the first gap 44. The deformation of the buffer portion 45 buffers the electrode assembly 20, preventing the current collector 40 from impacting the electrode assembly 20 and causing damage to the electrode assembly 20, thus preventing a short circuit in the battery cell. Furthermore, the buffer portion 45 does not require additional space in the battery cell along the first direction Z, maintaining the compactness of the battery cell while achieving the buffering function, thereby improving the energy density of the battery cell.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell having a first orientation (Z), characterized in that, include: The housing (10) has a receiving cavity (11); Electrode assembly (20), the electrode assembly (20) is disposed in the receiving cavity (11); Top cover assembly (30), which is connected to the housing (10) and covers the receiving cavity (11); A current collector (40) is disposed between the electrode assembly (20) and the top cover assembly (30). The current collector (40) includes a first connecting part (41) and a second connecting part (42) connected to each other. The first connecting part (41) is electrically connected to the electrode assembly (20), and the second connecting part (42) is electrically connected to the top cover assembly (30). The first connecting part (41) and the second connecting part (42) are spaced apart in the first direction (Z) and form a first gap (44). At least one of the first connecting part (41) and the second connecting part (42) is provided with a buffer part (45), which is located in the first gap (44).

2. The battery cell according to claim 1, characterized in that, The buffer portion (45) includes a first protrusion (451) and a second protrusion (452) both located within the first gap (44). The first protrusion (451) is provided on the first connecting portion (41), and the first protrusion (451) protrudes toward one side of the second connecting portion (42); the second protrusion (452) is provided on the second connecting portion (42), the second protrusion (452) is disposed opposite to the first protrusion (451), and the second protrusion (452) protrudes toward one side of the first connecting portion (41).

3. The battery cell according to claim 2, characterized in that, A portion of the first connecting portion (41) is recessed along the first direction (Z) toward the side of the second connecting portion (42) to form the first protrusion (451); a portion of the second connecting portion (42) is recessed along the first direction (Z) toward the side of the first connecting portion (41) to form the second protrusion.

4. The battery cell according to claim 3, characterized in that, The battery cell also has a second direction (X) perpendicular to the first direction (Z); the current collector (40) further includes a transition portion (43) extending along the second direction (X), the transition portion (43) connecting the first connecting portion (41) and the second connecting portion (42). The first protrusion (451) and the second protrusion (452) are both arranged in a strip shape and extend along the second direction (X), and the first protrusion (451) and the second protrusion (452) abut against each other in the first direction (Z).

5. The battery cell according to claim 1, characterized in that, The top cover assembly (30) includes a top cover plate (32) and a pole post (31); the top cover plate (32) is connected to the housing (10) and covers the receiving cavity (11); the pole post (31) passes through the top cover plate (32); and the pole post (31) is electrically connected to the second connecting part (42). The buffer section (45) is provided in at least two locations; at least two of the buffer sections (45) are located circumferentially on the pole post (31).

6. The battery cell according to claim 5, characterized in that, The electrode post (31) is provided with a liquid injection hole (311), the liquid injection hole (311) penetrates the electrode post (31) along the first direction (Z), and the first gap (44) communicates with the receiving cavity (11); The second connecting part (42) is provided with a first liquid passage hole (421), the first liquid passage hole (421) passes through the second connecting part (42) along the first direction (Z), and the first liquid passage hole (421) connects the liquid injection hole (311) and the first gap (44). And / or, the first connecting part (41) is provided with a second liquid passage (411), the second liquid passage (411) passes through the first connecting part (41) along the first direction (Z), the second liquid passage (411) connects the first gap (44) and the receiving cavity (11); a plurality of second liquid passages (411) are provided and spaced apart, and at least one second liquid passage is offset from the injection hole (311) in the first direction (Z).

7. The battery cell according to claim 5, characterized in that, The electrode assembly (20) includes a first tab (21), a second tab (22) and an electrode body (23), wherein the first tab (21) and the second tab (22) are electrically connected to opposite sides of the electrode body (23) in the first direction (Z); The pole post (31) is insulated from the top cover plate (32), the first pole tab (21) is electrically connected to the first connecting part (41), and the second pole tab (22) is electrically connected to the housing (10).

8. The battery cell according to claim 1, characterized in that, The first connecting part (41) is an aluminum plate, and the current collecting member (40) also includes a first copper plate (46). In the first direction (Z), the first copper plate (46) is electrically connected to the side of the first connecting part (41) facing the second connecting part (42). And / or, the second connecting part (42) is an aluminum plate, and the current collecting member (40) further includes a second copper plate (47), which is electrically connected to the side of the second connecting part (42) facing the first connecting part (41) in the first direction (Z).

9. The battery cell according to any one of claims 1-8, characterized in that, The battery cell also includes a buffer (50), which is disposed between the first connecting portion (41) and the second connecting portion (42), and in the first direction (Z), the buffer (50) abuts against the first connecting portion (41) and the second connecting portion (42).

10. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-9.

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