Battery cell and battery pack

Abstract

The application discloses a battery monomer and a battery pack. The battery monomer comprises a shell, an electrode assembly arranged in the shell, a top cover assembly comprising a top cover sheet, a pole and a first insulating piece, the top cover sheet being connected with the shell, the pole being arranged in the top cover sheet along a first direction and being electrically connected with the electrode assembly, the first insulating piece being connected with one side of the top cover sheet away from the electrode assembly and being arranged around the pole, the pole being provided with a first clamping groove, the first clamping groove being arranged on the outer circumferential side of the pole and being located on the side of the pole away from the top cover sheet, and a clamping ring being arranged on the side of the first insulating piece away from the electrode assembly, the clamping ring being arranged around the pole, a part of the clamping ring being clamped in the groove wall of the first clamping groove, and the other part of the clamping ring being in contact with the first insulating piece. In this way, the pole, the first insulating piece and the top cover sheet can be fixed only by clamping the clamping ring into the first clamping groove, so that the assembly steps are reduced, the operation difficulty is lowered and the assembly efficiency is improved.

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 increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. The requirements for the performance and safety of lithium-ion batteries are increasing. The lithium battery cover assembly is a key component in lithium-ion batteries. Its main function is to weld with the shell to form a sealed cavity and to bring out the positive and negative electrodes of the battery.

[0003] The cover plate assembly consists of a riveting block, upper plastic part, terminal post, top cover plate, lower plastic part, and sealing ring. The cover plate assembly is typically assembled using a riveting method. The main principle is that the terminal post expands by being riveted, thus assembling the riveting block, terminal post, top cover plate, upper plastic part, lower plastic part, and sealing ring. However, because the riveting encapsulation method requires the creation of corresponding tooling molds, the assembly of the cover plate assembly is relatively complex, resulting in higher production costs. Utility Model Content

[0004] This application aims to provide a battery cell and a battery pack that can solve the problems of complex assembly and high production cost of cover plate components in the prior art.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a battery cell having a first direction, comprising: a housing; an electrode assembly disposed within the housing; a top cover assembly including a top cover plate, a terminal post, and a first insulating member, wherein the top cover plate is connected to the housing, the terminal post passes through the top cover plate along the first direction, and the terminal post is electrically connected to the electrode assembly; the first insulating member is connected to the side of the top cover plate opposite to the electrode assembly and is disposed around the terminal post; the terminal post has a first slot, the first slot being formed on the outer periphery of the terminal post and located on the side of the terminal post opposite to the top cover plate; and a retaining ring, the retaining ring being disposed on the side of the first insulating member opposite to the electrode assembly, the retaining ring being disposed around the terminal post, a portion of the retaining ring being engaged within the groove wall of the first slot, and the other portion of the retaining ring contacting the first insulating member.

[0007] Optionally, the retaining ring has a first inclined surface and a first end face that are connected to each other. The first inclined surface is located on the side of the retaining ring facing the pole post, and the first end face is located on the side of the retaining ring facing the top cover plate. The included angle between the first inclined surface and the first end face is a first acute angle. The first retaining groove has a first groove wall and a second groove wall that are connected to each other. The included angle between the first groove wall and the second groove wall is a second acute angle. The first inclined surface is connected to the first groove wall, and the first end face is connected to the second groove wall.

[0008] Optionally, the first acute angle and the second acute angle are equal; and / or, the first insulating member has a second end face, the second end face being disposed on the side of the first insulating member opposite to the electrode assembly, and the second groove wall and the second end face being flush.

[0009] Optionally, the retaining ring includes a retaining portion, a first mounting portion, and a second mounting portion; the retaining portion is arranged circumferentially around a portion of the electrode post, and the retaining portion is connected to the side of the first insulating member opposite to the electrode assembly; the first mounting portion is connected to one end of the retaining portion along the circumferential direction, and the second mounting portion is connected to the other end of the retaining portion along the circumferential direction, and the first mounting portion and the second mounting portion are detachably connected; the retaining portion, the first mounting portion, and the second mounting portion are all engaged with the groove wall of the first retaining groove.

[0010] Optionally, the surface of the first mounting portion facing the electrode assembly and the surface of the snap-fit ​​portion facing the electrode assembly are flush; and / or, the surface of the second mounting portion away from the electrode assembly is flush with the surface of the snap-fit ​​portion away from the electrode assembly.

[0011] Optionally, the first mounting portion and the second mounting portion are arranged circumferentially along a portion of the pole post. The first mounting portion has a first mating surface extending in the first direction on the side facing the second mounting portion, and the second mounting portion has a second mating surface extending in the first direction on the side facing the first mounting portion. The first mating surface and the second mating surface can be detachably connected.

[0012] Optionally, the first mounting portion and the second mounting portion have grooves on the side opposite to the electrode assembly. Along the first direction, the grooves are recessed from the surface of the first mounting portion opposite to the electrode assembly toward the electrode assembly, and the grooves are recessed from the surface of the second mounting portion opposite to the electrode assembly toward the electrode assembly.

[0013] Optionally, at least one of the first mounting portion and the second mounting portion is provided with a mounting hole extending through the first direction, and the battery cell further includes a first protrusion, which protrudes from the side of the first insulating member opposite to the electrode assembly and passes through the mounting hole.

[0014] Optionally, the first mounting portion and the second mounting portion are stacked along the first direction. The first mounting portion has a third end face facing the second mounting portion, and the end of the snap-fit ​​portion connected to the first mounting portion has a fourth end face. The third end face and the fourth end face are connected to form a first step. The second mounting portion has a fifth end face facing the first mounting portion, and the end of the snap-fit ​​portion connected to the second mounting portion has a sixth end face. The fifth end face and the sixth end face are connected to form a second step. The fifth end face and the third end face are separable.

[0015] Optionally, the first mounting portion has a locking hole that penetrates the third end face along the first direction; the battery cell further includes a second protrusion that protrudes from the fifth end face and is inserted into the wall of the locking hole; or, the battery cell further includes a second protrusion that protrudes from the third end face; the second mounting portion has a locking hole that penetrates the fifth end face along the first direction and is inserted into the wall of the locking hole.

[0016] Optionally, the first mounting portion and the second mounting portion are stacked along the first direction. The first mounting portion has a second inclined surface, a third inclined surface, and a first plane disposed between the second inclined surface and the third inclined surface. The first plane extends along the first direction. The second inclined surface and the first plane are connected and enclosed to form a second groove recessed in the direction toward the electrode assembly. The third inclined surface is connected and enclosed to form a first boss protruding in the direction away from the electrode assembly. The second mounting portion has a fourth inclined surface, a fifth inclined surface, and a second plane disposed between the fourth inclined surface and the fifth inclined surface. The second plane extends along the first direction. The fourth inclined surface and the second plane are connected and enclosed to form a third groove recessed in the direction away from the electrode assembly. The fifth inclined surface is connected and enclosed to form a second boss protruding in the direction toward the electrode assembly. The first boss is engaged in the third groove, and the second boss is engaged in the second groove.

[0017] Optionally, the top cover assembly further includes a sealing element; the top cover plate has an electrode post hole extending along the first direction, the hole wall of the electrode post hole has a sixth inclined surface, the sixth inclined surface being inclined relative to the first direction; the outer peripheral side of the electrode post has a seventh inclined surface, the seventh inclined surface being inclined relative to the first direction; the sealing element is disposed around the electrode post, the entire sealing element is located within the electrode post hole, the sealing element is sealed and connected to the sixth inclined surface and the seventh inclined surface respectively, the sealing element has a seventh end face disposed away from the electrode assembly, and the first insulating element is connected to the seventh end face.

[0018] Optionally, the top cover assembly further includes a second insulating member; the sealing member has an eighth end face disposed near the electrode assembly, the second insulating member is disposed around the pole post, at least a portion of the second insulating member is located within the housing, and the second insulating member is connected to the side of the eighth end face near the electrode assembly.

[0019] Optionally, the electrode post has a third plane disposed near the electrode assembly; the angle between the sixth inclined plane and the third plane is a third acute angle; the angle between the seventh inclined plane and the third plane is a fourth acute angle; the third acute angle and the fourth acute angle are equal.

[0020] Optionally, the outer periphery of the seal has a ninth inclined surface that abuts against the sixth inclined surface, the ninth inclined surface forming a fifth acute angle with the third plane, the fifth acute angle being equal to the third acute angle; and / or, the inner periphery of the seal has a tenth inclined surface that abuts against the seventh inclined surface, the tenth inclined surface forming a sixth acute angle with the third plane, the sixth acute angle being equal to the fourth acute angle.

[0021] Secondly, embodiments of this application propose a battery pack comprising the battery cells described in the above embodiments.

[0022] In this embodiment, a first groove is provided on the outer periphery of the terminal post, and a retaining ring extends into the first groove and engages with the groove wall. Thus, during battery cell assembly, simply engaging the retaining ring into the first groove is sufficient to install and fix the terminal post, the first insulating component, and the top cover plate. Compared to the riveting assembly method in the prior art, this not only simplifies the assembly process, reduces operational difficulty, and improves assembly efficiency, but also eliminates the need for complex riveting and material expansion processes, i.e., it eliminates the need for corresponding riveting tooling molds, reducing the costs of mold design, manufacturing, and maintenance. Furthermore, by engaging the retaining ring with the groove wall of the first groove on the terminal post and ensuring contact between the retaining ring and the first insulating component, mutual restraint between the retaining ring, the first insulating component, and the terminal post is achieved, which helps prevent the terminal post from loosening or shifting. Simultaneously, the first insulating component surrounds the terminal post, enhancing the insulation and sealing of the top cover assembly, thereby improving the safety performance of the battery cell.

[0023] 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

[0024] 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:

[0025] Figure 1 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of a first type of retaining ring according to an embodiment of this application;

[0027] Figure 3 This is a partially enlarged view of the first type of retaining ring according to an embodiment of this application;

[0028] Figure 4 It is along Figure 1 Cross-sectional view of the first embodiment of the AA line;

[0029] Figure 5 yes Figure 4 An enlarged view of section B, shown in the center circle;

[0030] Figure 6 yes Figure 5 A schematic diagram showing the removal of the retaining ring and seal.

[0031] Figure 7 This is an exploded view of a portion of the structure of the top cover assembly according to an embodiment of this application;

[0032] Figure 8 yes Figure 1 Cross-sectional view of the second embodiment of line AA in the middle;

[0033] Figure 9 This is a schematic diagram of a second type of retaining ring according to an embodiment of this application;

[0034] Figure 10 yes Figure 9 A cross-sectional view of the CC line;

[0035] Figure 11 This is a schematic diagram of a third type of retaining ring according to an embodiment of this application;

[0036] Figure 12 This is a partially enlarged view of the third type of retaining ring according to an embodiment of this application.

[0037] Figure label:

[0038] 10. Shell; 11. Receiving cavity;

[0039] 20. Electrode assembly; 21. Electrode body; 22. Tab;

[0040] 30. Top cover assembly;

[0041] 31. Top cover plate; 311. Pole post hole; 311a. Sixth inclined surface;

[0042] 32. Pole post; 321. First slot; 321a. First slot wall; 321b. Second slot wall; 322. Seventh inclined plane; 323. Third plane;

[0043] 33. First insulating component; 331. Second end face;

[0044] 34. Sealing element; 341. Seventh end face; 342. Eighth end face; 343. Ninth inclined surface; 344. Tenth inclined surface;

[0045] 35. Second insulating component;

[0046] 36. First protrusion;

[0047] 40. Snap ring;

[0048] 41. Snap-fit ​​part; 411. Fourth end face; 412. Sixth end face;

[0049] 42. First mounting part; 421. First mating surface; 422. Third end face; 423. Snap hole; 425a. Second inclined surface; 425b. Third inclined surface; 425c. First flat surface; 425d. Second slot; 425e. First boss;

[0050] 43. Second mounting part; 431. Second mating surface; 432. Fifth end face; 433a. Fourth inclined surface; 433b. Fifth inclined surface; 433c. Second plane; 433d. Third slot; 433e. Second boss;

[0051] 44. First end face; 45. First inclined surface; 46. Groove; 47. Mounting hole; 48. Second protrusion;

[0052] α1, First acute angle; α2, Second acute angle; α3, Third acute angle; α4, Fourth acute angle; α5, Fifth acute angle; α6, Sixth acute angle;

[0053] Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] like Figures 1 to 6 As shown in the embodiment of this application, a battery cell with a first direction Z is proposed, including: a housing 10; an electrode assembly 20 disposed within the housing 10; a top cover assembly 30 including a top cover plate 31, a terminal post 32, and a first insulating member 33, wherein the top cover plate 31 is connected to the housing 10, the terminal post 32 passes through the top cover plate 31 along the first direction Z, and the terminal post 32 is electrically connected to the electrode assembly 20; the first insulating member 33 is connected to the side of the top cover plate 31 away from the electrode assembly 20 and is disposed around the terminal post 32; the terminal post 32 has a first slot 321, the first slot 321 is opened on the outer periphery of the terminal post 32, and the first slot 321 is located on the side of the terminal post 32 away from the top cover plate 31; and a retaining ring 40 is disposed on the side of the first insulating member 33 away from the electrode assembly 20, the retaining ring 40 is disposed around the terminal post 32, a part of the retaining ring 40 is engaged in the groove wall of the first slot 321, and the other part of the retaining ring 40 is in contact with the first insulating member 33.

[0060] Specifically, the housing 10 has a receiving cavity 11, and the electrode assembly 20 includes an electrode body 21 and an electrode tab 22. The electrode body 21 and the electrode tab 22 are electrically connected to each other and are both located in the receiving cavity 11. The electrode post 32 is electrically connected to the electrode tab 22. The top cover 31 closes the receiving cavity 11 and is connected to the housing 10, thereby protecting the electrode assembly 20.

[0061] It should be noted that in this embodiment, the first direction Z is the height direction of the battery cell, the second direction Y can be the length direction of the battery cell, and the third direction X is the width direction of the battery cell. The first direction Z, the second direction Y, and the third direction X are all perpendicular to each other. The first direction Z, the second direction Y, and the third direction X are introduced to facilitate the description of the structural positional relationship of the battery cell, thereby making it easier to understand its structure.

[0062] In this embodiment, a first groove 321 is provided on the outer periphery of the terminal post 32, and a retaining ring 40 extends into the first groove 321 and engages with the groove wall of the first groove 321. Thus, during the battery cell assembly process, simply engaging the retaining ring 40 into the first groove 321 is sufficient to install and fix the terminal post 32, the first insulating component 33, and the top cover plate 31. Compared to the riveting assembly method in the prior art, this not only simplifies the assembly process, reduces operational difficulty, and improves assembly efficiency, but also eliminates the need for complex riveting and material expansion processes, i.e., it eliminates the need for corresponding riveting tooling molds, reducing the cost of mold design, manufacturing, and maintenance. Furthermore, by engaging the retaining ring 40 with the groove wall of the first groove 321 of the terminal post 32 and making the retaining ring 40 contact the first insulating component 33, mutual restraint between the retaining ring 40, the first insulating component 33, and the terminal post 32 can be achieved, which helps prevent the terminal post 32 from loosening or shifting. Meanwhile, the first insulating element 33 is arranged around the terminal post 32, which enhances the insulation and sealing of the top cover assembly 30, thereby improving the safety performance of the battery cell.

[0063] Optionally, such as Figure 5 and Figure 6 As shown, the retaining ring 40 has a first inclined surface 45 and a first end face 44 connected to each other. The first inclined surface 45 is located on the side of the retaining ring 40 facing the pole post 32, and the first end face 44 is located on the side of the retaining ring 40 facing the top cover plate 31. The included angle between the first inclined surface 45 and the first end face 44 is a first acute angle α1. The first retaining groove 321 has a first groove wall 321a and a second groove wall 321b connected to each other. The included angle between the first groove wall 321a and the second groove wall 321b is a second acute angle α2. The first inclined surface 45 is connected to the first groove wall 321a, and the first end face 44 is connected to the second groove wall 321b.

[0064] It should be noted that an acute angle means: 0° < angle < 90°, such as 0.5°, 5°, 10°, 15°, 20°, 25°, 30°, 34°, 35°, 40°, 45°, 60°, 80°, 88°, 89°, etc. In other words, any value other than 0° and 90° can be selected from the range of 0° to 90°, without any specific limitation.

[0065] In this embodiment, by setting the included angle between the first inclined surface 45 and the first end face 44 as a first acute angle α1, and the included angle between the first groove wall 321a and the second groove wall 321b as a second acute angle α2, the first end face 44 is connected to the second groove wall 321b, and the first end face 44 is connected to the second groove wall 321b, so that the part where the retaining ring 40 and the groove wall of the first retaining groove 321 are connected forms a wedge structure. Using this wedge structure not only facilitates the installation of the retaining ring 40, but also prevents the pole post 32 from coming loose from the top cover plate 31 when the pole post 32 is under force, thereby improving the reliability and safety of the connection between the retaining ring 40 and the pole post 32.

[0066] It is understandable that the first inclined surface 45 and the first groove wall 321a can be directly attached, and the first end face 44 and the second groove wall 321b can also be directly attached, so that the retaining ring 40 can be snapped into the first groove 321; of course, adhesive can also be applied between the retaining ring 40 and the groove wall of the first groove 321 to achieve the connection between the two, thereby further improving the connection strength between the two.

[0067] It should be noted that the included angle α1 between the first inclined plane 45 and the first end face 44 can be understood as the angle formed between the first inclined line formed by the intersection of the cutting plane and the first inclined plane 45 and the first end face 44, for example... Figure 5 As shown, the included angle α1 can be understood as the angle formed between the first oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the third direction X and the first oblique surface 45, and the first end face 44.

[0068] Similarly, the included angle α2 between the first groove wall 321a and the second groove wall 321b can be understood as the angle formed between the second oblique line formed by the intersection of the cutting plane and the first groove wall 321a and the straight line formed by the intersection of the cutting plane and the second groove wall 321b, for example... Figures 5 to 6 As shown, the included angle α2 can be understood as the angle formed between the second oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the third direction X with the first groove wall 321a and the straight line formed by the intersection with the second groove wall 321b.

[0069] Optionally, such as Figure 5 As shown, the first acute angle α1 and the second acute angle α2 are equal.

[0070] In this embodiment, by setting the first acute angle α1 and the second acute angle α2 to be equal, the retaining ring 40 and the pole post 32 can fit more tightly, which helps to increase the area of ​​close contact between the retaining ring 40 and the pole post 32, thereby helping to improve the connection strength between the retaining ring 40 and the pole post 32.

[0071] Optionally, such as Figure 5 and Figure 6As shown, the first insulating member 33 has a second end face 331, which is located on the side of the first insulating member 33 away from the electrode assembly 20. The second groove wall 321b is flush with the second end face 331.

[0072] In this embodiment, by setting the second groove wall 321b and the second end face 331 to be flush, the first end face 44 of the retaining ring 40 can simultaneously contact the second groove wall 321b of the first retaining groove 321 and the second end face 331 of the first insulating member 33, thereby facilitating installation and fitting.

[0073] It should be noted that "the second groove wall 321b and the second end face 331 are flush" means that there is no height difference between the second groove wall 321b and the second end face 331 in the first direction Z or the height difference is within a certain range.

[0074] Optionally, Figure 2 , Figure 5 and Figure 6 As shown, the retaining ring 40 includes a retaining portion 41, a first mounting portion 42, and a second mounting portion 43. The retaining portion 41 is arranged circumferentially around a portion of the electrode post 32, and the retaining portion 41 is connected to the side of the first insulating member 33 opposite to the electrode assembly 20. The first mounting portion 42 is connected to one end of the retaining portion 41 along the circumferential direction, and the second mounting portion 43 is connected to the other end of the retaining portion 41 along the circumferential direction. The first mounting portion 42 and the second mounting portion 43 can be detachably connected. The retaining portion 41, the first mounting portion 42, and the second mounting portion 43 are all engaged with the groove wall of the first retaining groove 321.

[0075] In this embodiment, the snap-fit ​​portion 41 is arranged circumferentially around the electrode post 32, and the snap-fit ​​portion 41 is connected to the side of the first insulating member 33 opposite to the electrode assembly 20. The first mounting portion 42 is connected to one end of the snap-fit ​​portion 41 along the circumferential direction, and the second mounting portion 43 is connected to the other end of the snap-fit ​​portion 41 along the circumferential direction. The first mounting portion 42 and the second mounting portion 43 can be detachably connected, so that the retaining ring 40 can be opened by assembly and disassembly tools (such as calipers, robotic arms, etc.), thereby facilitating the connection between the retaining ring 40 and the electrode post 32. At the same time, the retaining ring 40 has a certain elasticity and can return to its original shape after being opened. In addition, the snap-fit ​​portion 41 of the retaining ring 40 can be placed in the first retaining groove 321 from the radial direction of the electrode post 32 by the first mounting portion 42 and the second mounting portion 43, and then fixed by connecting the first mounting portion 42 and the second mounting portion 43, making the assembly simpler and faster.

[0076] It should be noted that the circumferential arrangement of the locking part 41 around the pole post 32 means that the locking part 41 is not a complete, closed ring, but only an open, arc-shaped structure that only surrounds a part of the circumference of the pole post 32. That is, the locking part 41 is roughly in the shape of a "C".

[0077] Optionally, Figure 2 , Figure 5 and Figure 6 As shown, the surface of the first mounting part 42 facing the electrode assembly 20 and the surface of the snap-fit ​​part 41 facing the electrode assembly 20 are flush.

[0078] In this embodiment, by setting the side surface of the first mounting portion 42 facing the electrode assembly 20 and the side surface of the snap-fit ​​portion 41 facing the electrode assembly 20 to be flush, the size of the snap ring 40 along the first direction Z is reduced, thus avoiding the snap ring 40 occupying too much space of the battery cell along the first direction Z.

[0079] Optionally, the side surface of the second mounting portion 43 facing away from the electrode assembly 20 is flush with the side surface of the snap-fit ​​portion 41 facing away from the electrode assembly 20.

[0080] In this embodiment, the surface of the second mounting portion 43 facing away from the electrode assembly 20 is flush with the surface of the snap-fit ​​portion 41 facing away from the electrode assembly 20. This reduces the size of the retaining ring 40 along the first direction Z, preventing the retaining ring 40 from occupying too much space of the battery cell along the first direction Z.

[0081] It should be noted that "the surface of the first mounting part 42 facing the electrode assembly 20 and the surface of the snap-fit ​​part 41 facing the electrode assembly 20 are flush" means that there is no height difference or the height difference is within a certain range in the first direction Z. "The surface of the second mounting part 43 facing away from the electrode assembly 20 and the surface of the snap-fit ​​part 41 facing away from the electrode assembly 20 are flush" means that there is no height difference or the height difference is within a certain range in the second mounting part 43 facing away from the electrode assembly 20 and the snap-fit ​​part 41 facing away from the electrode assembly 20.

[0082] Optionally, such as Figure 3 As shown, the first mounting portion 42 and the second mounting portion 43 are arranged circumferentially along a portion of the pole post 32. The side of the first mounting portion 42 facing the second mounting portion 43 has a first mating surface 421 extending in the first direction Z, and the side of the second mounting portion 43 facing the first mounting portion 42 has a second mating surface 431 extending in the first direction Z. The first mating surface 421 and the second mating surface 431 can be detachably connected.

[0083] It should be noted that the retaining ring 40 is an elastic structural component, meaning that the retaining ring 40 itself has the ability to undergo recoverable elastic deformation when subjected to force.

[0084] In this embodiment, the first mating surface 421 of the first mounting portion 42 and the second mating surface 431 of the second mounting portion 43 are detachably connected. This allows the first mating surface 421 and the second mating surface 431 to separate during the installation of the retaining ring 40, thus opening the retaining ring 40 for easy placement within the first retaining groove 321. After the retaining ring 40 is assembled, its elasticity allows the first mating surface 421 and the second mating surface 431 to abut together, thereby enhancing the connection strength of the retaining ring 40.

[0085] Optionally, such as Figure 2 and Figure 5 As shown, the first mounting portion 42 and the second mounting portion 43 have a groove 46 on the side away from the electrode assembly 20. Along the first direction Z, the groove 46 is recessed from the surface of the first mounting portion 42 away from the electrode assembly 20 toward the electrode assembly 20, and the groove 46 is recessed from the surface of the second mounting portion 43 away from the electrode assembly 20 toward the electrode assembly 20.

[0086] In this embodiment, a groove 46 is provided on the side of the first mounting portion 42 and the second mounting portion 43 opposite to the electrode assembly 20. This allows assembly and disassembly tools (such as calipers, robotic arms, etc.) to open the retaining ring 40 through the groove 46, thereby facilitating the connection between the retaining ring 40 and the terminal post 32. Furthermore, providing the groove 46 reduces the weight of the retaining ring 40, which helps to improve the energy density of the battery cell.

[0087] Optionally, such as Figure 4 and Figure 7 As shown, at least one of the first mounting portion 42 and the second mounting portion 43 is provided with a mounting hole 47 extending through in the first direction Z. The battery cell also includes a first protrusion 36, which protrudes from the side of the first insulating member 33 away from the electrode assembly 20 and passes through the mounting hole 47.

[0088] In this embodiment, at least one of the first mounting portion 42 and the second mounting portion 43 has a mounting hole 47 extending through in the first direction Z. A first protrusion 36 protrudes from the side of the first insulating member 33 facing away from the electrode assembly 20 and passes through the mounting hole 47. Thus, the cooperation between the mounting hole 47 and the first protrusion 36 enhances the connection strength between the retaining ring 40 and the electrode post 32, effectively preventing the retaining ring 40 from dislodging from the first retaining groove 321, thereby improving the connection reliability between the retaining ring 40 and the electrode post 32.

[0089] It should be noted that at least one of the first mounting part 42 and the second mounting part 43 is provided with a mounting hole 47 that extends through the first direction Z. This means that one of the first mounting part 42 and the second mounting part 43 is provided with a mounting hole 47, or both the first mounting part 42 and the second mounting part 43 are provided with mounting holes 47.

[0090] Optionally, such as Figure 9 and Figure 10 As shown, the first mounting portion 42 and the second mounting portion 43 are stacked along the first direction Z. The first mounting portion 42 has a third end face 422 facing the second mounting portion 43. The end of the snap-fit ​​portion 41 connected to the first mounting portion 42 has a fourth end face 411. The third end face 422 and the fourth end face 411 are connected to form a first step. The second mounting portion 43 has a fifth end face 432 facing the first mounting portion 42. The end of the snap-fit ​​portion 41 connected to the second mounting portion 43 has a sixth end face 412. The fifth end face 432 and the sixth end face 412 are connected to form a second step. The fifth end face 432 and the third end face 422 can be detachably connected.

[0091] In this embodiment, by stacking the first mounting portion 42 and the second mounting portion 43 along the first direction Z, the space occupied by the retaining ring 40 in the first direction Z is reduced, which facilitates the improvement of the energy density of the battery cell. Furthermore, the third end face 422 of the first mounting portion 42 and the fourth end face 411 of the latching portion 41 are connected to form a first step; the fifth end face 432 of the second mounting portion 43 and the sixth end face 412 of the latching portion 41 are connected to form a second step, and the fifth end face 432 and the third end face 422 can be detachably connected. Thus, at the connection between the first mounting portion 42 and the second mounting portion 43, the first step and the second step cooperate to limit the retaining ring 40 along the first direction Z, while also reducing the height space occupied by the first mounting portion 42 and the second mounting portion 43, leaving more circumferential space for the latching portion 41, thereby increasing the connection area between the latching portion 41, the terminal post 32, and the first insulating member 33, and improving the connection strength.

[0092] Optionally, such as Figures 8 to 10 As shown, the first mounting part 42 has a locking hole 423, which penetrates the third end face 422 along the first direction Z; the battery cell also includes a second protrusion 48, which protrudes from the fifth end face 432 and is inserted into the hole wall of the locking hole 423.

[0093] In this embodiment, a locking hole 423 is provided in the first mounting portion 42, and a second protrusion 48 is provided protruding from the fifth end face 432, with the second protrusion 48 inserting into the wall of the locking hole 423. This improves the connection strength between the first mounting portion 42 and the second mounting portion 43 through the insertion structure, thereby enhancing the fixing strength of the retaining ring 40 and preventing it from dislodging.

[0094] In addition, the insertion structure of the retaining ring 40 and the protrusion is set inside the first step and the second step, which makes full use of the space of the first mounting part 42 and the second mounting part 43 in the first direction Z, avoiding the retaining ring 40 and the protrusion from adding extra volume, thereby improving the space utilization rate inside the battery cell.

[0095] Optionally, such as Figures 8 to 10 As shown, the battery cell also includes a second protrusion 48, which protrudes from the third end face 422; the second mounting part 43 has a locking hole 423, which penetrates the fifth end face 432 along the first direction Z, and the second protrusion 48 is inserted into the hole wall of the locking hole 423.

[0096] In this embodiment, a locking hole 423 is provided in the second mounting portion 43, and a second protrusion 48 is provided protruding from the third end face 422, with the second protrusion 48 inserting into the wall of the locking hole 423. This improves the connection strength between the first mounting portion 42 and the second mounting portion 43 through the insertion structure, thereby enhancing the fixing strength of the retaining ring 40 and preventing it from dislodging.

[0097] Optionally, such as Figure 11 and Figure 12 As shown, the first mounting portion 42 and the second mounting portion 43 are stacked along the first direction Z. The first mounting portion 42 has a second inclined surface 425a, a third inclined surface 425b, and a first plane 425c disposed between the second inclined surface 425a and the third inclined surface 425b. The first plane 425c extends along the first direction Z. The second inclined surface 425a and the first plane 425c are connected and enclosed to form a second groove 425d recessed in the direction toward the electrode assembly 20. The third inclined surface 425b is connected to the first plane 425c and encloses to form a first boss 425e protruding in the direction away from the electrode assembly 20. The second mounting portion 43... Part 43 has a fourth inclined surface 433a, a fifth inclined surface 433b, and a second plane 433c disposed between the fourth inclined surface 433a and the fifth inclined surface 433b. The second plane 433c extends along the first direction Z. The fourth inclined surface 433a and the second plane 433c are connected and enclosed to form a third groove 433d recessed in a direction away from the electrode assembly 20. The fifth inclined surface 433b is connected to the second plane 433c and encloses to form a second boss 433e protruding in a direction toward the electrode assembly 20. The first boss 425e is engaged in the third groove 433d, and the second boss 433e is engaged in the second groove 425d.

[0098] It is understandable that the second inclined plane 425a, the third inclined plane 425b, the fourth inclined plane 433a and the fifth inclined plane 433b can be parallel to each other and respectively inclined relative to the first direction Z.

[0099] In this embodiment, a second groove 425d recessed towards the electrode assembly 20 is formed by connecting and enclosing a second inclined surface 425a and a first plane 425c; a first boss 425e protruding towards the direction away from the electrode assembly 20 is formed by connecting and enclosing a third inclined surface 425b and a first plane 425c; a third groove 433d recessed towards the direction away from the electrode assembly 20 is formed by connecting and enclosing a fourth inclined surface 433a and a second plane 433c; and a second boss 433e protruding towards the electrode assembly 20 is formed by connecting and enclosing a fifth inclined surface 433b and a second plane 433c. The first boss 425e is engaged in the third groove 433d, and the second boss 433e is engaged in the second groove 425d. In this way, by having the first boss 425e engaged in the third groove 433d and the second boss 433e engaged in the second groove 425d, the retaining ring 40 can be constrained in multiple directions, thereby improving the fixing strength of the retaining ring 40 and preventing it from coming off circumferentially. Furthermore, the inclined arrangement can evenly distribute the axial force, radial force, and torsional load borne by the pole post 32 to the connection interface between the retaining ring 40 and the pole post 32, avoiding stress concentration.

[0100] Optionally, such as Figures 4 to 6 As shown, the top cover assembly 30 also includes a sealing element 34; the top cover plate 31 has an electrode post hole 311 extending along the first direction Z, the hole wall of the electrode post hole 311 has a sixth inclined surface 311a, the sixth inclined surface 311a is inclined relative to the first direction Z; the outer periphery of the electrode post 32 has a seventh inclined surface 322, the seventh inclined surface 322 is inclined relative to the first direction Z; the sealing element 34 is arranged around the electrode post 32, the entire sealing element 34 is located inside the electrode post hole 311, the sealing element 34 is sealed and connected to the sixth inclined surface 311a and the seventh inclined surface 322 respectively, the sealing element 34 has a seventh end face 341 disposed away from the electrode assembly 20, and the first insulating element 33 is connected to the seventh end face 341.

[0101] In this embodiment, by placing the entire sealing member 34 within the pole hole 311 of the top cover plate 31, i.e., completely housing the entire sealing member 34 within the pole hole 311, the structure of the sealing member 34 is simplified. Simultaneously, since the hole wall of the pole hole 311 has a sixth inclined surface 311a, the outer peripheral surface of the pole 32 has a seventh inclined surface 322, and the first insulating member 33 is arranged around the pole 32, the sealing member 34 is limited and compressed by the sixth inclined surface 311a and the seventh inclined surface 322, thereby simplifying the structure of the pole 32.

[0102] In this way, reliable sealing can be achieved, and the materials used for the terminal post 32 and the seal 34 can be saved, which helps to reduce the manufacturing cost of the battery cell and improve space utilization, thereby increasing the energy density of the battery cell.

[0103] Additionally, a first insulating element 33 is connected to the seventh end face 341. This facilitates the use of the sixth inclined surface 311a and the seventh inclined surface 322 to limit the sealing element 34.

[0104] It should be noted that the sealing connection between the seal 34 and the sixth inclined surface 311a and the seventh inclined surface 322 can be understood as follows: the outer peripheral side of the seal 34 is connected to the sixth inclined surface 311a to form a seal, and the inner peripheral side of the seal 34 is connected to the seventh inclined surface 322 to form a seal.

[0105] Optionally, such as Figures 4 to 6 As shown, the top cover assembly 30 also includes a second insulating member 35; the sealing member 34 has an eighth end face 342 disposed near the electrode assembly 20, the second insulating member 35 is disposed around the pole post 32, at least a portion of the second insulating member 35 is located inside the housing 10, and the second insulating member 35 is connected to the side of the eighth end face 342 near the electrode assembly 20.

[0106] In this embodiment, a second insulating member 35 is disposed around the terminal post 32, with at least a portion of the second insulating member 35 located within the housing 10. The second insulating member 35 is connected to the side of the eighth end face 342 near the electrode assembly 20. This facilitates insulation between the terminal post 32 and the top cover plate 31 through the second insulating member 35, thereby improving the reliability of the battery cell.

[0107] In some embodiments, such as Figure 5 As shown, the second insulating member 35 has a bent portion that extends between the pole post 42 and the top cover 31 and connects with the eighth end face 342, thereby achieving a lower seal on the sealing member 34.

[0108] Optionally, such as Figure 5 and Figure 6 As shown, the pole post 32 has a third plane 323 disposed near the electrode assembly 20; the angle between the sixth inclined plane 311a and the third plane 323 is a third acute angle α3; the angle between the seventh inclined plane 322 and the third plane 323 is a fourth acute angle α4; the third acute angle α3 and the fourth acute angle α4 are equal.

[0109] In this embodiment, by setting the third acute angle α3 and the fourth acute angle α4 to be equal, the forces on the inner and outer circumferential sides of the seal 34 can be more balanced, which helps to improve the sealing reliability of the seal 34.

[0110] It should be noted that the angle α3 between the sixth inclined plane 311a and the third plane 323 can be understood as the angle formed between the third inclined line formed by the intersection of the cutting plane and the sixth inclined plane 311a and the third plane 323. For example... Figures 5 to 6As shown, the included angle α3 can be understood as the angle formed between the third oblique line and the third plane 323 formed by the intersection of the cutting plane parallel to the first direction Z and the third direction X with the sixth oblique plane 311a.

[0111] Similarly, the angle α4 between the seventh inclined plane 322 and the third plane 323 can be understood as the angle formed between the fourth inclined line formed by the intersection of the cutting plane and the seventh inclined plane 322 and the third plane 323, for example... Figures 5 to 6 As shown, the included angle α4 can be understood as the angle formed between the fourth oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the third direction X with the seventh oblique plane 322 and the third plane 323.

[0112] Optionally, such as Figure 5 and Figure 6 As shown, the outer periphery of the seal 34 has a ninth inclined surface 343 that abuts against the sixth inclined surface 311a. The angle between the ninth inclined surface 343 and the third plane 323 is a fifth acute angle α5, which is equal to the third acute angle α3.

[0113] In this embodiment, the fifth acute angle α5 and the third acute angle α3 are set to be equal. This allows the seal 34 to fit more tightly with the top cover plate 31, increasing the contact area between the seal 34 and the top cover plate 31, thereby improving the sealing performance of the battery cell.

[0114] It should be noted that the angle α5 between the ninth inclined plane 343 and the third plane 323 can be understood as the angle formed between the fifth inclined line formed by the intersection of the cutting plane and the ninth inclined plane 343 and the third plane 323, for example... Figures 5 to 6 As shown, the included angle α5 can be understood as the angle formed between the fifth oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the third direction X with the ninth oblique plane 343 and the third plane 323.

[0115] Optionally, such as Figure 5 and Figure 6 As shown, the inner circumferential side of the seal 34 has a tenth inclined surface 344 that abuts against the seventh inclined surface 322. The angle between the tenth inclined surface 344 and the third plane 323 is the sixth acute angle α6, which is equal to the fourth acute angle α4.

[0116] In this embodiment, the sixth acute angle α6 and the fourth acute angle α4 are set to be equal. This allows the seal 34 to fit more tightly with the top cover plate 31, increasing the contact area between the seal 34 and the top cover plate 31, thereby improving the sealing performance of the battery cell.

[0117] It should be noted that the angle α6 between the tenth inclined plane 344 and the third plane 323 can be understood as the angle formed between the sixth inclined line formed by the intersection of the cutting plane and the tenth inclined plane 344 and the third plane 323, for example... Figures 5 to 6 As shown, the included angle α6 can be understood as the angle formed between the sixth oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the third direction X and the tenth oblique plane 344, and the third plane 323.

[0118] Optionally, this application provides a battery pack including the battery cells described in the above embodiments. In this embodiment, a first groove 321 is provided on the outer periphery of the terminal post 32, and a retaining ring 40 extends into the first groove 321 and engages with the groove wall of the first groove 321. Thus, during battery assembly, simply engaging the retaining ring 40 into the first groove 321 is sufficient to install and fix the terminal post 32, the first insulating member 33, and the top cover plate 31. Compared to the riveting assembly method in the prior art, this not only simplifies the assembly process, reduces operational difficulty, and improves assembly efficiency, but also eliminates the need for complex riveting and material expansion processes, i.e., it eliminates the need for corresponding riveting tooling molds, reducing the cost of mold design, manufacturing, and maintenance. Furthermore, by engaging the retaining ring 40 with the groove wall of the first groove 321 of the terminal post 32 and making the retaining ring 40 contact the first insulating member 33, mutual positioning between the retaining ring 40, the first insulating member 33, and the terminal post 32 can be achieved, effectively preventing the terminal post 32 from loosening or shifting. Meanwhile, the first insulating element 33 is arranged around the terminal post 32, which enhances the insulation and sealing of the top cover assembly 30, thereby improving the safety performance of the battery cell.

[0119] 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.

[0120] 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: Shell (10); Electrode assembly (20) is disposed within the housing (10); The top cover assembly (30) includes a top cover plate (31), an electrode post (32), and a first insulating member (33). The top cover plate (31) is connected to the housing (10). The electrode post (32) passes through the top cover plate (31) along the first direction (Z) and is electrically connected to the electrode assembly (20). The first insulating member (33) is connected to the side of the top cover plate (31) away from the electrode assembly (20) and is arranged around the electrode post (32). The electrode post (32) has a first slot (321). The first slot (321) is opened on the outer periphery of the electrode post (32) and is located on the side of the electrode post (32) away from the top cover plate (31). A retaining ring (40) is provided on the side of the first insulating member (33) away from the electrode assembly (20). The retaining ring (40) is arranged around the pole post (32). A part of the retaining ring (40) is engaged with the groove wall of the first retaining groove (321), and the other part of the retaining ring (40) is in contact with the first insulating member (33).

2. The battery cell according to claim 1, characterized in that, The retaining ring (40) has a first inclined surface (45) and a first end face (44) connected to each other. The first inclined surface (45) is located on the side of the retaining ring (40) facing the pole post (32), and the first end face (44) is located on the side of the retaining ring (40) facing the top cover plate (31). The included angle between the first inclined surface (45) and the first end face (44) is a first acute angle (α1). The first slot (321) has a first slot wall (321a) and a second slot wall (321b) connected to each other, and the included angle between the first slot wall (321a) and the second slot wall (321b) is a second acute angle (α2); the first inclined surface (45) is connected to the first slot wall (321a), and the first end face (44) is connected to the second slot wall (321b).

3. The battery cell according to claim 2, characterized in that, The first acute angle (α1) and the second acute angle (α2) are equal; And / or, the first insulating member (33) has a second end face (331) disposed on the side of the first insulating member (33) away from the electrode assembly (20), and the second groove wall (321b) and the second end face (331) are flush.

4. The battery cell according to claim 1, characterized in that, The retaining ring (40) includes a retaining part (41), a first mounting part (42), and a second mounting part (43); The snap-fit ​​portion (41) is partially circumferentially arranged around the pole post (32), and the snap-fit ​​portion (41) is connected to the side of the first insulating member (33) away from the electrode assembly (20); the first mounting portion (42) is connected to one end of the snap-fit ​​portion (41) along the circumferential direction, and the second mounting portion (43) is connected to the other end of the snap-fit ​​portion (41) along the circumferential direction, and the first mounting portion (42) and the second mounting portion (43) can be detachably connected; the snap-fit ​​portion (41), the first mounting portion (42) and the second mounting portion (43) are all snapped into the groove wall of the first slot (321).

5. The battery cell according to claim 4, characterized in that, The first mounting portion (42) is flush with the side surface facing the electrode assembly (20) and the snap-fit ​​portion (41) is flush with the side surface facing the electrode assembly (20); and / or, the second mounting portion (43) is flush with the side surface facing away from the electrode assembly (20) and the snap-fit ​​portion (41) is flush with the side surface facing away from the electrode assembly (20).

6. The battery cell according to claim 4, characterized in that, The first mounting portion (42) and the second mounting portion (43) are arranged circumferentially along a portion of the pole post (32). The first mounting portion (42) has a first mating surface (421) extending along the first direction (Z) on the side facing the second mounting portion (43). The second mounting portion (43) has a second mating surface (431) extending along the first direction (Z) on the side facing the first mounting portion (42). The first mating surface (421) and the second mating surface (431) are separable and connected.

7. The battery cell according to claim 4, characterized in that, The first mounting portion (42) and the second mounting portion (43) have a groove (46) on the side away from the electrode assembly (21). Along the first direction (Z), the groove (46) is recessed from the surface of the first mounting portion (42) away from the electrode assembly (21) toward the electrode assembly (21), and the groove (46) is recessed from the surface of the second mounting portion (43) away from the electrode assembly (21) toward the electrode assembly (21).

8. The battery cell according to claim 4, characterized in that, At least one of the first mounting portion (42) and the second mounting portion (43) is provided with a mounting hole (47) extending through the first direction (Z); The battery cell also includes a first protrusion (36), which protrudes from the side of the first insulating member (33) away from the electrode assembly (21) and passes through the mounting hole (47).

9. The battery cell according to claim 4, characterized in that, The first mounting portion (42) and the second mounting portion (43) are stacked along the first direction (Z). The first mounting portion (42) has a third end face (422) facing the second mounting portion (43). The end of the snap-fit ​​portion (41) connected to the first mounting portion (42) has a fourth end face (411). The third end face (422) and the fourth end face (411) are connected to form a first step. The second mounting portion (43) has a fifth end face (432) facing the first mounting portion (42), and the end of the snap-fit ​​portion (41) connected to the second mounting portion (43) has a sixth end face (412). The fifth end face (432) and the sixth end face (412) are connected to form a second step. The fifth end face (432) and the third end face (422) are detachably connected.

10. The battery cell according to claim 9, characterized in that, The first mounting part (42) has a locking hole (423) that penetrates the third end face (422) along the first direction (Z); the battery cell also includes a second protrusion (48) that protrudes from the fifth end face (432) and is inserted into the hole wall of the locking hole (423); Alternatively, the battery cell may further include a second protrusion (48) which protrudes from the third end face (422); the second mounting portion (43) has a locking hole (423) which penetrates the fifth end face (432) along the first direction (Z), and the second protrusion (48) is inserted into the wall of the locking hole (423).

11. The battery cell according to claim 4, characterized in that, The first mounting portion (42) and the second mounting portion (43) are stacked along the first direction (Z). The first mounting portion (42) has a second inclined surface (425a), a third inclined surface (425b), and a first plane (425c) disposed between the second inclined surface (425a) and the third inclined surface (425b). The first plane (425c) extends along the first direction (Z). The second inclined surface (425a) and the first plane (425c) are connected and enclosed to form a second groove (425d) recessed in the direction toward the electrode assembly (20). The third inclined surface (425b) is connected and enclosed to form a first boss (425e) protruding in the direction away from the electrode assembly (20). The second mounting portion (43) has a fourth inclined surface (433a), a fifth inclined surface (433b), and a second plane (433c) disposed between the fourth inclined surface (433a) and the fifth inclined surface (425b). The second plane (433c) extends along the first direction (Z). The fourth inclined surface (433a) and the second plane (433c) are connected and enclosed to form a third groove (433d) recessed in a direction away from the electrode assembly (20). The fifth inclined surface (433b) is connected and enclosed to form a second boss (433e) protruding in a direction toward the electrode assembly (20). The first boss (425e) is engaged in the third slot (433d), and the second boss (433e) is engaged in the second slot (425d).

12. The battery cell according to any one of claims 1-11, characterized in that, The top cover assembly (30) also includes a seal (34); The top cover plate (31) has a pole post hole (311) extending along the first direction (Z), and the hole wall of the pole post hole (311) has a sixth inclined surface (311a), which is inclined relative to the first direction (Z); the outer periphery of the pole post (32) has a seventh inclined surface (322), which is inclined relative to the first direction (Z); The sealing element (34) is arranged around the pole post (32), and the entire sealing element (34) is located inside the pole post hole (311). The sealing element (34) is sealed to the sixth inclined surface (311a) and the seventh inclined surface (322) respectively. The sealing element (34) has a seventh end face (341) disposed away from the electrode assembly (20), and the first insulating element (33) is connected to the seventh end face (341).

13. The battery cell according to claim 12, characterized in that, The top cover assembly (30) also includes a second insulating element (35); The seal (34) has an eighth end face (342) disposed near the electrode assembly (20), the second insulating member (35) is disposed around the pole post (32), at least a portion of the second insulating member (35) is located within the housing (10), and the second insulating member (35) is connected to the side of the eighth end face (342) near the electrode assembly (20).

14. The battery cell according to claim 12, characterized in that, The pole post (32) has a third plane (323) located near the electrode assembly (20); the angle between the sixth inclined plane (311a) and the third plane (323) is a third acute angle (α3); the angle between the seventh inclined plane (322) and the third plane (323) is a fourth acute angle (α4); the third acute angle (α3) and the fourth acute angle (α4) are equal.

15. The battery cell according to claim 14, characterized in that, The outer periphery of the seal (34) has a ninth inclined surface (343) that abuts against the sixth inclined surface (311a). The angle between the ninth inclined surface (343) and the third plane (323) is a fifth acute angle (α5), and the fifth acute angle (α5) and the third acute angle (α3) are equal. And / or, the inner circumferential side of the seal (150) has a tenth inclined surface (344) that abuts against the seventh inclined surface (322), the angle between the tenth inclined surface (344) and the third plane (323) being a sixth acute angle (α6), the sixth acute angle (α6) being equal to the fourth acute angle (α4).

16. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-15.

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