Battery cell and battery pack

Abstract

The application discloses a battery monomer and a battery pack. The battery monomer comprises a shell, a top cover assembly comprising a top cover sheet and a pole, the top cover sheet being connected with the shell, the pole being provided through the top cover sheet, the pole having a through hole penetrating in a first direction; an electrode assembly provided in the shell, the electrode assembly comprising an electrode body and a tab, the tab comprising a vertical part and a collection part, the collection part being provided between the electrode body and the vertical part and being connected with the electrode body and the vertical part respectively; an insulation limiting piece comprising a supporting part and a second limiting part, the supporting part being connected with the electrode body on a side close to the top cover sheet, the supporting part being provided on at least one side of the collection part in a second direction, the second limiting part being connected with the supporting part on a side facing the top cover sheet, the vertical part being provided through the second limiting part and the through hole, and the vertical part being electrically connected with the pole. The application limits the vertical part of the tab through the insulation limiting piece, effectively avoiding the risk of short circuit caused by reverse insertion of the tab.

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] In recent years, new energy vehicles have made leaps and bounds in development. In the field of electric vehicles, battery cells play an irreplaceable and important role as the power source of electric vehicles.

[0003] In related technologies, a battery cell includes an electrode assembly and a terminal post. The end of the electrode assembly facing the terminal post has a tab, which is electrically connected to the terminal post via a connecting piece. Typically, to facilitate welding of the tab to the connecting piece, a certain degree of redundancy is required for the tab. However, because the redundant part of the tab may bend during assembly, this not only occupies space in the height of the battery cell but also poses a risk of reverse insertion and short circuit. Utility Model Content

[0004] This application aims to provide a battery cell and a battery pack that can solve the problems in the prior art where the tabs and connecting pieces occupy the height space of the battery cell and pose a risk of short circuit due to reverse insertion.

[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 and a second direction that are perpendicular to each other, the battery cell comprising:

[0007] case;

[0008] A top cover assembly includes a top cover plate and an electrode post, the top cover plate being connected to the housing, the electrode post being disposed through the top cover plate, and the electrode post having a through hole extending along the first direction;

[0009] An electrode assembly is disposed within the housing. The electrode assembly includes an electrode body and an electrode tab. The electrode tab includes a vertical portion and a converging portion. The converging portion is disposed between the electrode body and the vertical portion and is connected to the electrode body and the vertical portion respectively.

[0010] An insulating limiting member includes a support portion and a first limiting portion. The support portion is connected to the electrode body on the side near the top cover plate, and the support portion is disposed on at least one side of the collecting portion along the second direction. The first limiting portion is connected to the support portion on the side facing the top cover plate. The vertical portion passes through the first limiting portion and the through hole, and the vertical portion is electrically connected to the pole post.

[0011] Optionally, the gathering portion has two first side surfaces disposed opposite each other along the second direction; the support portion is connected to the first side surfaces.

[0012] Optionally, the support portion includes a first sub-support portion and a second sub-support portion; the first sub-support portion and the second sub-support portion are respectively disposed on both sides of the gathering portion along the second direction, both the first sub-support portion and the second sub-support portion extend along the second direction, the first sub-support portion and the second sub-support portion are respectively connected to the first limiting portion, the first sub-support portion and the second sub-support portion are connected to the electrode body near the top cover plate; the first sub-support portion abuts against one of the first side surfaces, and the second sub-support portion abuts against the other first side surface.

[0013] Optionally, the first limiting portion includes a first sub-limiting portion and a second sub-limiting portion, both of which extend along the first direction; the first sub-limiting portion and the second sub-limiting portion are connected and enclosed to form a limiting space, and the vertical portion passes through the limiting space; the first sub-limiting portion is connected to the first sub-support portion, and the second sub-limiting portion is connected to the second sub-support portion.

[0014] Optionally, the insulating limiting member further includes a first sub-connecting portion and a second sub-connecting portion; the first sub-connecting portion is connected between the first sub-support portion and the first sub-limiting portion, and the second sub-connecting portion is connected between the second sub-support portion and the second sub-limiting portion; the vertical portion has two second side surfaces arranged opposite to each other along the second direction, the first sub-connecting portion abuts against one of the second side surfaces, and the second sub-connecting portion abuts against the other second side surface.

[0015] Optionally, the electrode tab further includes a flattening portion; the flattening portion is connected to the end of the vertical portion away from the converging portion; the orthographic projection of the vertical portion on the electrode body along the first direction is located within the orthographic projection range of the flattening portion on the electrode body along the first direction.

[0016] Optionally, the electrode post has a groove on the side opposite to the electrode assembly, the groove is connected to the through hole, and the flattened part is disposed in the groove and welded to the electrode post.

[0017] Optionally, the battery cell further has a third direction perpendicular to the first direction and the second direction, and along the first direction and from the electrode assembly to the pole post, the width of the groove gradually increases along the third direction.

[0018] Optionally, the electrode post includes a first electrode post portion and a second electrode post portion connected to each other; the first electrode post portion is disposed on the side of the second electrode post portion away from the electrode body, the second electrode post portion is provided with the through hole, the side of the second electrode post portion facing the first electrode post portion is provided with the groove, and the flattening portion is electrically connected to the second electrode post portion; the first electrode post portion is provided with a clearance hole extending along the first direction, the clearance hole communicating with the groove, and along the third direction, the groove wall of the groove and the hole wall of the clearance hole are spaced apart.

[0019] Optionally, the first electrode post includes a main body and a second limiting part; the main body passes through the top cover plate, the main body is connected to the side of the second electrode post away from the electrode assembly, the second limiting part protrudes from the end of the main body away from the electrode assembly, and the second limiting part is arranged around the main body.

[0020] Optionally, the top cover assembly further includes a first insulating member; the first insulating member is disposed around the pole post, and a portion of the first insulating member is disposed between the second limiting portion and the top cover sheet along the first direction.

[0021] Optionally, the top cover further includes a protrusion and a body portion; the body portion is connected to the protrusion and the housing respectively, the main body portion passes through the protrusion and the body portion, the protrusion at least partially protrudes from the side of the body portion away from the electrode assembly, the protrusion is inclined relative to the first direction, and a portion of the first insulating member is disposed between the protrusion and the second limiting portion along the first direction.

[0022] Optionally, the second electrode post has a limiting groove, which is located on the side of the second electrode post near the electrode body. The limiting groove surrounds the through hole and communicates with the through hole, and a portion of the first limiting part is embedded in the limiting groove.

[0023] Optionally, the top cover assembly further includes a sealing cover; the sealing cover connects to the side of the first pole portion opposite to the second pole portion and seals the clearance hole.

[0024] Optionally, the top cover assembly further includes a sealing element; the top cover plate has a through-hole extending along the first direction, the wall of the through-hole having a first inclined surface, the first inclined surface being inclined relative to the first direction; the outer peripheral surface of the pole has a second inclined surface, the second inclined surface being inclined relative to the first direction; the sealing element is disposed around the pole, the sealing element is entirely located within the through-hole, and the sealing element is respectively sealed to the first inclined surface and the second inclined surface.

[0025] Optionally, the top cover assembly further includes a second insulating member; the sealing member has a first 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 first end face near the electrode assembly.

[0026] Optionally, the battery cell further has a third direction perpendicular to the first direction and the second direction, and the length of the through hole along the second direction is greater than the width along the third direction.

[0027] Secondly, embodiments of this application propose a battery pack comprising the battery cells described in the above embodiments.

[0028] In this embodiment, an insulating limiting member is provided between the electrode body and the top cover plate. The supporting part of the insulating limiting member is connected to the side of the electrode body near the top cover plate, and the first limiting part is connected to the supporting part facing the top cover plate. The vertical part of the electrode tab passes through the first limiting part. In this way, the first limiting part of the insulating limiting member can be used to gather, support and shape the vertical part, preventing the electrode tab from being excessively bent and deformed during assembly or use, which could lead to the risk of reverse insertion and short circuit. At the same time, the supporting part connected between the electrode body and the first limiting part can play a role in supporting the installation of the first limiting part. In addition, the supporting part is provided on at least one side of the collection part along the second direction, so as to facilitate the installation of the insulating limiting member on the electrode assembly, and the space between the electrode assembly and the top cover plate on both sides of the collection part along the second direction can be used to improve the space utilization rate inside the battery cell.

[0029] 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

[0030] 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:

[0031] Figure 1 This is a schematic diagram of a first type of battery cell according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the connection between the insulating limiting member and the electrode tab according to an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of an insulating limiting member according to an embodiment of this application;

[0034] Figure 4 It is along Figure 1 Sectional view of line AA in the middle;

[0035] Figure 5 yes Figure 4 Enlarged view of section C, shown in the center circle;

[0036] Figure 6 It is along Figure 1 Sectional view of the middle BB line;

[0037] Figure 7 yes Figure 6 Enlarged view of section D shown in the center circle;

[0038] Figure 8 This is a schematic diagram of the connection between the pole and the cover plate according to an embodiment of this application;

[0039] Figure 9 This is a cross-sectional view of a second type of battery cell according to an embodiment of this application;

[0040] Figure 10 This is a cross-sectional view of a third type of battery cell according to an embodiment of this application.

[0041] Figure label:

[0042] 10. Shell; 11. Receiving cavity;

[0043] 20. Electrode assembly; 21. Electrode body; 22. Tab; 221. Vertical part; 2211. Second side surface; 222. Converging part; 2221. First side surface; 223. Flattening part;

[0044] 30. Insulating limiting member; 31. First limiting part; 311. First sub-limiting part; 312. Second sub-limiting part; 313. Limiting space; 32. Support part; 321. First sub-support part; 322. Second sub-support part; 331. First sub-connecting part; 332. Second sub-connecting part;

[0045] 40. Top cover assembly; 41. Top cover piece; 411. Pole post hole; 411a. First inclined surface; 412. Protrusion; 413. Body part; 42. Pole post; 421. First pole post part; 4211. Main body part; 4211a. Second inclined surface; 4212. Second limiting part; 4213. Clearance hole; 422. Second pole post part; 4221. Groove; 4222. Limiting groove; 423. Through hole; 43. First insulating element; 431. First insulating part; 432. Second insulating part; 44. Sealing space; 45. Sealing element; 451. First end face; 452. Second end face; 46. Second insulating element; 47. Sealing cover; 48. Fixing element;

[0046] Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The applicant noted that currently, during the assembly of power batteries, adapter plates are commonly used to fold the tabs before welding them together. This requires reserving space inside the battery for the tabs to fold, resulting in wasted internal space. One optimized solution is to eliminate the need for folding the tabs and instead vertically weld them to the conductive terminals along the first direction. However, the problem is that vertical tabs, being thinner and less rigid, are prone to collapsing, potentially leading to a short circuit due to reverse insertion.

[0052] 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.

[0053] like Figures 1 to 5 As shown in the embodiment of this application, a battery cell is proposed, having a first direction Z and a second direction Y that are perpendicular to each other. The battery cell includes: a housing 10; a top cover assembly 40, including a top cover plate 41 and an electrode post 42, the top cover plate 41 being connected to the housing 10, the electrode post 42 passing through the top cover plate 41, the electrode post 42 having a through hole 423 extending along the first direction Z; and an electrode assembly 20, disposed within the housing 10, the electrode assembly 20 including an electrode body 21 and an electrode tab 22, the electrode tab 22 including a vertical portion 221 and a collecting portion 222. 22 is disposed between the electrode body 21 and the vertical part 221 and is connected to the electrode body 21 and the vertical part 221 respectively; the insulating limiting member 30 includes a support part 32 and a first limiting part 31. The support part 32 is connected to the side of the electrode body 21 near the top cover plate 41 and is disposed on at least one side of the collecting part 222 along the second direction Y. The first limiting part 31 is connected to the side of the support part 32 facing the top cover plate 41. The vertical part 221 passes through the first limiting part 31 and the through hole 423 and is electrically connected to the pole post 42.

[0054] Specifically, the housing 10 has a receiving cavity 11, the electrode assembly 20 is disposed in the receiving cavity 11, and the top cover 41 closes the receiving cavity 11 and is connected to the housing 10, thereby protecting the electrode assembly 20.

[0055] 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.

[0056] In this embodiment, by providing an insulating limiting member 30 between the electrode body 21 and the top cover plate 41, the support portion 32 of the insulating limiting member 30 is connected to the side of the electrode body 21 near the top cover plate 41, and the first limiting portion 31 is connected to the side of the support portion 32 facing the top cover plate 41. The vertical portion 221 of the electrode tab 22 passes through the first limiting portion 31. In this way, the first limiting portion 31 of the insulating limiting member 30 can be used to achieve the folding, support, and shaping of the vertical portion 221, preventing the electrode tab 22 from over-forming during assembly or use. The bending and deformation could lead to a short circuit due to reverse insertion of the tabs. At the same time, the support part 32 is connected between the electrode body 21 and the first limiting part 31, which can provide support for the installation of the first limiting part 31. In addition, the support part 32 is located on at least one side of the collection part 222 along the second direction Y, so that the insulating limiting member 30 can be installed on the electrode assembly 20, and the space between the electrode assembly 20 and the top cover plate 41 on both sides of the collection part 222 along the second direction Y can be used to improve the space utilization rate inside the battery cell.

[0057] Furthermore, in this application, the tab 22 passes through the through hole 423 of the vertical part 221 and the electrode post 42 and is electrically connected to the electrode post 42. This can reduce the degree of bending of the tab 22 during the connection process, avoid excessive redundancy and space occupation, thereby reducing the distance between the electrode assembly 20 and the top cover assembly 40, that is, reducing the space redundancy between the electrode assembly 20 and the top cover assembly 40, improving the space utilization rate of the battery cell, and thus improving the energy density of the battery cell.

[0058] Understandably, the insulating limiting member 30 is made of insulating material. Its function is not only to limit the vertical part 221 of the electrode tab 22, but also to provide insulation between the vertical part 221 of the electrode tab 22 and the electrode assembly 20, thereby avoiding the risk of short circuit caused by the electrical connection between the vertical part 221 and the electrode assembly 20.

[0059] Optionally, such as Figure 2 As shown, the collection part 222 has two first side surfaces 2221 arranged opposite each other along the second direction Y; the support part 32 is connected to the first side surfaces 2221.

[0060] In this embodiment, the support portion 32 is disposed on at least one side of the collection portion 222 along the second direction Y, and the support portion 32 is connected to the first side surface 2221 of the collection portion 222. In this way, the support portion 32 can form a binding support effect on the first side surface 2221 of the collection portion 222, thereby supporting the first side surface 2221 of the collection portion 222.

[0061] It should be noted that the connection between the support portion 32 and the first side 2221 of the collection portion 222 can be adhesive or abutment, and this embodiment of the application does not impose any restrictions.

[0062] Optionally, such as Figure 3 As shown, the support portion 32 includes a first sub-support portion 321 and a second sub-support portion 322; the first sub-support portion 321 and the second sub-support portion 322 are respectively disposed on both sides of the collection portion 222 along the second direction Y, the first sub-support portion 321 and the second sub-support portion 322 both extend along the second direction Y, the first sub-support portion 321 and the second sub-support portion 322 are respectively connected to the first limiting portion 31, the first sub-support portion 321 and the second sub-support portion 322 are connected to the side of the electrode body 21 near the top cover plate 41; the first sub-support portion 321 abuts against one of the first side surfaces 2221, and the second sub-support portion 322 abuts against the other first side surface 2221.

[0063] In this embodiment, a first sub-support 321 is provided on one side of the collection portion 222 along the second direction Y, and a second sub-support 322 is provided on the other side of the collection portion 222 along the second direction Y. Both the first sub-support 321 and the second sub-support 322 extend along the second direction Y, with the first sub-support 321 abutting against one of the first side surfaces 2221 and the second sub-support 322 abutting against the other first side surface 2221. In this way, the first sub-support 321 and the second sub-support 322 can provide limiting support for the collection portion 222 from both sides of the second direction Y, thereby clamping and fixing the collection portion 222 and preventing the tab 22 from shifting or breaking during installation and use, thus improving the structural integrity and reliability of the tab 22.

[0064] Optionally, such as Figure 3 As shown, the first limiting part 31 includes a first sub-limiting part 311 and a second sub-limiting part 312, both of which extend along the first direction Z; the first sub-limiting part 311 and the second sub-limiting part 312 are connected and enclosed to form a limiting space 313, and the vertical part 221 passes through the limiting space 313; the first sub-limiting part 311 is connected to the first sub-support part 321, and the second sub-limiting part 312 is connected to the second sub-support part 322.

[0065] In this embodiment, a first sub-limiting part 311 and a second sub-limiting part 312 are provided, and the first sub-limiting part 311 and the second sub-limiting part 312 together enclose a limiting space 313, through which the vertical part 221 passes. This allows the limiting space 313 to provide circumferential limiting constraints on the vertical part 221. This ensures that the vertical part 221 maintains a vertical posture during installation and subsequent use, thereby achieving precise alignment with the through hole 423 of the pole post 42 and reducing the risk of short circuits due to contact with surrounding components caused by the vertical part 221 being misaligned.

[0066] Furthermore, during the installation of the vertical portion 221, a first sub-limiting portion 311 and a second sub-limiting portion 312 can be installed to move closer to the vertical portion 221 along the third direction X, thereby limiting the vertical portion 221. This ensures that the width of the limiting space 313 along the third direction X matches the thickness of the vertical portion 221 along the third direction X.

[0067] It is understandable that the first sub-limiting part 311 and the second sub-limiting part 312 both extend along the first direction Z, and the limiting space 313 formed by the first sub-limiting part 311 and the second sub-limiting part 312 also extends along the first direction Z, thereby adapting to the structure of the vertical part 221.

[0068] Optionally, such as Figure 2 and Figure 3 As shown, the insulating limiting member 30 also includes a first sub-connecting portion 331 and a second sub-connecting portion 332; the first sub-connecting portion 331 is connected between the first sub-support portion 321 and the first sub-limiting portion 311, and the second sub-connecting portion 332 is connected between the second sub-support portion 322 and the second sub-limiting portion 312; the vertical portion 221 has two second side surfaces 2211 arranged opposite to each other along the second direction Y, the first sub-connecting portion 331 abuts against one of the second side surfaces 2211, and the second sub-connecting portion 332 abuts against the other second side surface 2211.

[0069] In this embodiment, the first sub-connecting portion 331 abuts against one second side surface 2211 of the vertical portion 221, and the second sub-connecting portion 332 abuts against the other second side surface 2211 of the vertical portion 221. This allows the first and second sub-connecting portions 331 and 332 to provide support for the side surface of the vertical portion 221. Combined with the supporting function of the supporting portion 32, this enhances the limiting and fixing effect on the vertical portion 221, improving the structural integrity and reliability of the tab 22 during use.

[0070] It is understandable that the first sub-connecting part 331, the first sub-limiting part 311 and the first sub-supporting part 321 constitute the first sub-limiting member, and the second sub-connecting part 332, the second sub-limiting part 312 and the second sub-supporting part 322 constitute the second sub-limiting member. The insulating limiting member 30 is composed of the first sub-limiting member and the second sub-limiting member, thereby facilitating processing and installation.

[0071] In addition, such as Figure 3 As shown, the limiting space 313 limits the end of the vertical part 221 near the pole post 42, thereby effectively improving the connection reliability between the end of the vertical part 221 near the pole post 42 and the pole post 42.

[0072] In some embodiments, such as Figure 2 and Figure 3As shown, the first sub-connecting portion 331 and the second sub-connecting portion 332 can also abut against a portion of the first side surface 2221, thereby limiting the side surface of the gathering portion 222.

[0073] In some embodiments, the first sub-support portion 321 and the second sub-support portion 322 can be bonded to the electrode assembly 20 with adhesive, and the first sub-limiting portion 311 and the second sub-limiting portion 312 can also be bonded to the vertical portion 221 with adhesive.

[0074] Optionally, such as Figure 6 and Figure 7 As shown, the electrode tab 22 also includes a flattening portion 223; the flattening portion 223 is connected to the end of the vertical portion 221 away from the converging portion 222; the orthographic projection of the vertical portion 221 along the first direction Z on the electrode body 21 is located within the orthographic projection range of the flattening portion 223 along the first direction Z on the electrode body 21.

[0075] In this embodiment, a flattening portion 223 is provided at the end of the vertical portion 221 away from the collecting portion 222, and the orthographic projection of the vertical portion 221 along the first direction Z on the electrode body 21 is located within the orthographic projection range of the flattening portion 223 along the first direction Z on the electrode body 21. Thus, by connecting the flattening portion 223 to the electrode post 42, the connection area between the tab 22 and the electrode post 42 can be effectively increased. This facilitates connection operations and increases the connection strength between the tab 22 and the electrode post 42, effectively preventing connection failures caused by individual battery cells during use.

[0076] It should be noted that the electrode body 21 has a third end face on the side facing the top cover plate 41. The third end face is perpendicular to the first direction Z. The orthographic projection of the vertical part 221 along the first direction Z on the electrode body 21 refers to the orthographic projection of the vertical part 221 along the first direction Z on the first plane. The orthographic projection of the flattened part 223 along the first direction Z on the electrode body 21 refers to the orthographic projection of the flattened part 223 along the first direction Z in the first plane.

[0077] Optionally, such as Figure 7 and Figure 8 As shown, the pole post 42 has a groove 4221 on the side away from the electrode assembly 20. The groove 4221 is connected to the through hole 423. The flattened part 223 is located in the groove 4221 and welded to the pole post 42.

[0078] In this embodiment, a groove 4221 is provided on the side of the electrode post 42 away from the electrode assembly 20 to accommodate the flattened portion 223, facilitating welding of the flattened portion 223 to the electrode post 42. In this way, without increasing the size of the battery cell in the first direction Z, the connection between the electrode post 42 and the flattened portion 223 is achieved, thereby improving the energy density of the battery cell.

[0079] In some embodiments, such as Figure 7 and Figure 8 As shown, the groove 4221 can be a rectangular groove, a circular groove, a trapezoidal groove, or other irregularly shaped grooves. This embodiment of the application does not impose any limitations on this.

[0080] Optionally, such as Figure 7 and Figure 8 As shown, the battery cell also has a third direction X that is perpendicular to the first direction Z and the second direction Y respectively. Along the first direction Z and from the electrode assembly 20 to the pole post 42, the width of the groove 4221 gradually increases along the third direction X.

[0081] In this embodiment, the width of the groove 4221 gradually increases along the third direction X. This creates a structure where the groove 4221 is smaller at the bottom and larger at the top, which satisfies the welding requirements between the flattening part 223 and the pole post 42. At the same time, the groove wall of the groove 4221 can limit the flattening part 223, thereby preventing the pole tab 22 from coming out of the pole post 42.

[0082] Optionally, such as Figure 7 and Figure 8 As shown, the electrode post 42 includes a first electrode post portion 421 and a second electrode post portion 422 connected to each other; the first electrode post portion 421 is located on the side of the second electrode post portion 422 away from the electrode body 21, the second electrode post portion 422 has a through hole 423, the side of the second electrode post portion 422 facing the first electrode post portion 421 has a groove 4221, and the flattening portion 223 is electrically connected to the second electrode post portion 422; the first electrode post portion 421 has a clearance hole 4213 that penetrates along the first direction Z, the clearance hole 4213 communicates with the groove 4221, and along the third direction X, the groove wall of the groove 4221 and the hole wall of the clearance hole 4213 are spaced apart.

[0083] In this embodiment, the electrode post 42 is divided into a first electrode post portion 421 and a second electrode post portion 422. The first electrode post portion 421 is located on the side of the second electrode post portion 422 away from the electrode body 21. A groove 4221 is provided on the side of the second electrode post portion 422 facing the first electrode post portion 421. A clearance hole 4213 is provided in the first electrode post portion 421, extending through the first direction Z. Along the third direction X, the groove wall of the groove 4221 and the hole wall of the clearance hole 4213 are spaced apart. This reduces the length of the tab 22 within the electrode post 42 and hides the welding part of the tab 22 inside the electrode post, preventing external contamination. Simultaneously, when welding the groove wall of the groove 4221 and the flattened part 223, the clearance hole 4213 allows the flattened part 223 to be exposed in the second electrode post portion 422, facilitating the welding operation.

[0084] Specifically, in Figure 7In the design, the black triangles on both sides of the flattened portion 223 serve as welding points. By welding the flattened portion 223 and the groove 4221, electrolyte leakage from the groove 4221 is prevented, thus avoiding impact on the performance of the battery cell. Furthermore, after the flattened portion 223 and the groove 4221 are welded, a welding element can be placed at the interface between the flattened portion 223 and the groove 4221. By welding the welding element at the interface between the flattened portion 223 and the groove 4221, the sealing performance between the flattened portion 223 and the first electrode post portion 421 is further improved.

[0085] In some embodiments, the first electrode portion 421 and the second electrode portion 422 can be made of different materials, thereby reducing the manufacturing cost of the electrode while meeting the conductivity requirements. Specifically, when the electrode 42 is a negative electrode, the material of the second electrode portion 422 of the electrode 42 can be aluminum, and the material of the first electrode portion 421 of the electrode 42 can be copper. That is, it is not necessary to use copper as the negative electrode 42 entirely. The negative electrode 42 can be formed by a combination of copper and aluminum. This can meet the electrical connection requirements between the negative electrode 42 and the electrode assembly 20, and also save the use of copper, thereby reducing the manufacturing cost.

[0086] Optionally, such as Figure 7 and Figure 8 As shown, the first electrode post 421 includes a main body 4211 and a second limiting part 4212; the main body 4211 passes through the top cover plate 41, the main body 4211 is connected to the side of the second electrode post 422 away from the electrode assembly 20, the second limiting part 4212 protrudes from the outer peripheral surface of the end of the main body 4211 away from the electrode assembly 20, and the second limiting part 4212 is arranged around the main body 4211.

[0087] In this embodiment, by connecting the main body 4211 to the side of the second electrode post 422 away from the electrode assembly 20, the second limiting part 4212 protrudes from the outer peripheral surface of the end of the main body 4211 away from the electrode assembly 20. In this way, the second limiting part 4212 can restrict the electrode post 42 from moving closer to the electrode assembly 20 under external force, improving the stability of the electrode post 42 and thus helping to enhance the reliability of the electrical connection between the electrode post 42 and the electrode assembly 20.

[0088] Optionally, such as Figure 7 and Figure 8 As shown, the top cover assembly 40 also includes a first insulating member 43; the first insulating member 43 is disposed around the pole post 42, and a portion of the first insulating member 43 is disposed between the second limiting portion 4212 and the top cover piece 41 along the first direction Z.

[0089] In this embodiment, a first insulating member 43 is disposed around the pole post 42, with a portion of the first insulating member 43 positioned between the second limiting portion 4212 and the top cover plate 41 along the first direction Z. This facilitates insulation between the pole post 42 and the top cover plate 41 through the first insulating member 43.

[0090] In addition, the first insulating element 43 can be made of a material that is elastic and resistant to electrolyte corrosion (such as plastic or special rubber). When partially compressed between the second limiting part 4212 and the top cover plate 41, it can form a tight sealing ring, which can effectively prevent electrolyte vapor or liquid inside the battery cell from leaking out along the assembly gap between the terminal post 42 and the terminal post hole 411, while also preventing external moisture and impurities from entering, thus ensuring the stability of the internal chemical environment of the battery cell and the reliability of long-term use.

[0091] In some embodiments, such as Figure 9 As shown, the first pole post 421 only includes the main body 4211 and does not have a second limiting part 4212; the top cover assembly 40 also includes a fixing member 48, which is located on the side of the first insulating member 43 away from the electrode assembly 20, and the fixing member 48 abuts against the first insulating member 43, thereby limiting the first insulating member 43.

[0092] Optionally, such as Figure 7 and Figure 8 As shown, the top cover plate 41 also includes a protrusion 412 and a body portion 413; the body portion 413 is connected to the protrusion 412 and the housing 10 respectively, and the main body portion 4211 passes through the protrusion 412 and the body portion 413. The protrusion 412 protrudes at least partially from the side of the body portion 413 away from the electrode assembly 20. The protrusion 412 is inclined relative to the first direction Z. A portion of the first insulating member 43 is disposed between the protrusion 412 and the second limiting portion 4212 along the first direction Z.

[0093] In this embodiment, a protrusion 412 is provided that at least partially protrudes from the side of the body portion 413 away from the electrode assembly 20 and is inclined relative to the first direction Z. A portion of the first insulating member 43 is disposed between the protrusion 412 and the second limiting portion 4212 along the first direction Z. In this way, the protrusion 412 can support and limit the first insulating member 43, thereby preventing the first insulating member 43 from detaching from the top cover plate 41. In addition, the first insulating member 43 can also provide insulation between the protrusion 412 and the second limiting portion 4212, thereby reducing the risk of short circuit in the battery cell.

[0094] Specifically, such as Figure 7 and Figure 8As shown, the first insulating member 43 includes a first insulating portion 431 and a second insulating portion 432 connected to each other. A sealed space 44 is formed between the protrusion 412 of the top cover plate 41, the second limiting portion 4212 of the first pole portion 421, and the main body portion 4211 of the first pole portion 421. The first insulating portion 431 is disposed in the sealed space 44, thereby achieving an insulating effect between the protrusion 412 of the top cover plate 41, the second limiting portion 4212 of the first pole portion 421, and the main body portion 4211 of the first pole portion 421. In addition, a positioning groove is formed between the first insulating portion 431 and the second insulating portion 432. The protrusion 412 of the top cover plate 41 is embedded in the positioning groove, and the second insulating portion 432 is arranged around the protrusion 412. Thus, when installing the first insulating member 43, the positioning groove can be used to position the first insulating member 43, improving installation efficiency.

[0095] Optionally, such as Figure 7 and Figure 8 As shown, the second pole post 422 has a limiting groove 4222. The limiting groove 4222 is located on the side of the second pole post 422 near the electrode body 21. The limiting groove 4222 is arranged around the through hole 423 and communicates with the through hole 423. A portion of the first limiting part 31 is embedded in the limiting groove 4222.

[0096] In this embodiment, a limiting groove 4222 is provided on the side of the second electrode post 422 near the electrode body 21. The limiting groove 4222 surrounds and communicates with the through hole 423, and a portion of the first limiting part 31 is embedded in the limiting groove 4222. This enhances the connection strength between the first limiting part 31 and the second electrode post 422, preventing the insulating limiting member 30 from moving relative to the second electrode post 422 under stress during use, thereby improving the reliability of the battery cell. Furthermore, by fitting the first limiting part 31 onto the outer peripheral surface of the vertical part 221, the insulating limiting member 30 and the tab 22 can be simultaneously inserted into the electrode post 42, facilitating the vertical part 221 of the tab 22 to pass through the through hole 423.

[0097] In some embodiments, the depth of the limiting groove 4222 along the first direction Z can be one-quarter, one-third, or one-half of the height of the first limiting part 31 along the first direction Z, etc., and this application embodiment does not limit this.

[0098] Optionally, such as Figure 10 As shown, the top cover assembly 40 also includes a sealing cover 47; the sealing cover 47 connects to the side of the first pole post 421 opposite to the second pole post 422 and seals the clearance hole 4213.

[0099] In this embodiment, the sealing cap 47 is connected to the side of the first electrode post 421 opposite to the second electrode post 422 and covers the clearance hole 4213. Thus, the sealing cap 47 blocks the clearance hole 4213 of the first electrode post 421, forming a complete seal on the internal cavity formed by the clearance hole 4213 and the groove 4221. This prevents moisture, dust, impurities, etc., from entering the battery cell through the clearance hole 4213, thereby improving the sealing reliability of the battery cell.

[0100] Optionally, such as Figure 7 and Figure 8 As shown, the top cover assembly 40 also includes a sealing element 45; the top cover plate 41 has a pole post hole 411 extending along the first direction Z, the hole wall of the pole post hole 411 has a first inclined surface 411a, the first inclined surface 411a is inclined relative to the first direction Z; the outer peripheral surface of the pole post 42 has a second inclined surface 4211a, the second inclined surface 4211a is inclined relative to the first direction Z; the sealing element 45 is arranged around the pole post 42, the sealing element 45 is entirely located in the pole post hole 411, and the sealing element 45 is sealed and connected to the first inclined surface 411a and the second inclined surface 4211a respectively.

[0101] In this embodiment, the entire sealing member 45 is located within the pole hole 411 of the top cover plate 41, meaning the entire sealing member 45 is completely housed within the pole hole 411. This simplifies the structure of the sealing member 45. Simultaneously, since the wall of the pole hole 411 has a first inclined surface 411a, the angle between the first inclined surface 411a and the third direction X is a first acute angle. The outer peripheral surface of the pole 42 has a second inclined surface 4211a, the angle between the second inclined surface 4211a and the third direction X is a second acute angle. The first insulating member 43 is arranged around the pole 42 to achieve the joint limitation and compression of the sealing member 45 by the first and second inclined surfaces 411a, thereby simplifying the structure of the pole 42.

[0102] In this way, reliable sealing can be achieved, and the materials used for the terminal post 42 and the seal 45 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] 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.

[0104] It should be noted that the sealing connection of the sealing element 45 with the first inclined surface 411a and the second inclined surface 4211a can be understood as follows: the outer peripheral side of the sealing element 45 is connected to the first inclined surface 411a to form a seal, and the inner peripheral side of the sealing element 45 is connected to the second inclined surface 4211a to form a seal.

[0105] Optionally, such as Figure 7 and Figure 8 As shown, the top cover assembly 40 also includes a second insulating member 46; the sealing member 45 has a first end face 451 disposed near the electrode assembly 20, the second insulating member 46 is disposed around the electrode post 42, at least a portion of the second insulating member 46 is located inside the housing 10, and the second insulating member 46 is connected to the side of the first end face 451 near the electrode assembly 20.

[0106] In this embodiment, a second insulating member 46 is disposed around the terminal post 42, with at least a portion of the second insulating member 46 located within the housing 10. The second insulating member 46 is connected to the side of the first end face 451 near the electrode assembly 20. This facilitates insulation between the second terminal post 422 and the top cover plate 41 through the second insulating member 46, thereby improving the reliability of the battery cell.

[0107] In some embodiments, the seal 45 further has a second end face 452 disposed opposite to the first end face 451, and the first insulating portion 431 of the first insulating member 43 abuts against the second end face 452. This facilitates the use of the first inclined surface 411a, the second inclined surface 4211a, and the second insulating member 46 to limit the seal 45.

[0108] In some embodiments, the seal 45 at least covers the connection between the first electrode portion 421 and the second electrode portion 422, that is, the first end face 451 of the seal 45 extends beyond the connection between the first electrode portion 421 and the second electrode portion 422, thereby preventing electrolyte leakage from the connection between the first electrode portion 421 and the second electrode portion 422.

[0109] Optionally, such as Figure 5 and Figure 8 As shown, the battery cell also has a third direction X that is perpendicular to the first direction Z and the second direction Y respectively, and the length of the through hole 423 along the second direction Y is greater than its width along the third direction X.

[0110] In this embodiment of the application, by setting the length of the through hole 423 along the second direction Y to be greater than its width along the third direction X, that is, the through hole 423 is an elongated hole, thereby adapting to the structure of the vertical part 221 (which is also usually extended in a strip shape).

[0111] Optionally, embodiments of this application propose a battery pack including the battery cells described in the above embodiments.

[0112] In this embodiment, an insulating limiting member 30 is provided between the electrode body 21 and the top cover plate 41. The support portion 32 of the insulating limiting member 30 is connected to the side of the electrode body 21 near the top cover plate 41, and the first limiting portion 31 is connected to the side of the support portion 32 facing the top cover plate 41. The vertical portion 221 of the electrode tab 22 passes through the first limiting portion 31. In this way, the first limiting portion 31 of the insulating limiting member 30 can be used to gather, support, and shape the vertical portion 221, preventing the electrode tab 22 from over-extruding during assembly or use. The bending deformation could lead to a short circuit due to reverse insertion of the electrode tab. At the same time, the support part 32 is connected between the electrode body 21 and the first limiting part 31, which can provide support for the installation of the first limiting part 31. In addition, the support part 32 is located on at least one side of the collection part 222 along the second direction Y, so as to facilitate the installation of the insulating limiting member 30 on the electrode assembly 20, and to improve the space utilization rate inside the battery cell by utilizing the space between the electrode assembly 20 and the top cover plate 41 on both sides of the collection part 222 along the second direction Y.

[0113] Optionally, embodiments of this application also propose an electrical device, including the battery pack or battery cell described in the above embodiments.

[0114] In some embodiments, electrical devices may include laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, ships, spacecraft, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0115] Specifically, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.

[0116] 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.

[0117] 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, characterized in that, The battery cell, having a first direction (Z) and a second direction (Y) that are perpendicular to each other, comprises: Shell (10); The top cover assembly (40) includes a top cover plate (41) and a pole post (42), the top cover plate (41) being connected to the housing (10), the pole post (42) being inserted through the top cover plate (41), and the pole post (42) having a through hole (423) extending along the first direction (Z). An electrode assembly (20) is disposed within the housing (10). The electrode assembly (20) includes an electrode body (21) and a tab (22). The tab (22) includes a vertical portion (221) and a collecting portion (222). The collecting portion (222) is disposed between the electrode body (21) and the vertical portion (221) and is connected to the electrode body (21) and the vertical portion (221) respectively. An insulating limiting member (30) includes a support portion (32) and a first limiting portion (31). The support portion (32) is connected to the electrode body (21) on the side near the top cover plate (41), and the support portion (32) is disposed on at least one side of the collecting portion (222) along the second direction (Y). The first limiting portion (31) is connected to the support portion (32) on the side facing the top cover plate (41). The vertical portion (221) passes through the first limiting portion (31) and the through hole (423), and the vertical portion (221) is electrically connected to the pole post (42).

2. The battery cell according to claim 1, characterized in that, The collection portion (222) has two first side surfaces (2221) arranged opposite each other along the second direction (Y); the support portion (32) is connected to the first side surfaces (2221).

3. The battery cell according to claim 2, characterized in that, The support portion (32) includes a first sub-support portion (321) and a second sub-support portion (322); The first sub-support portion (321) and the second sub-support portion (322) are respectively disposed on both sides of the gathering portion (222) along the second direction (Y). The first sub-support portion (321) and the second sub-support portion (322) both extend along the second direction (Y). The first sub-support portion (321) and the second sub-support portion (322) are respectively connected to the first limiting portion (31). The first sub-support portion (321) and the second sub-support portion (322) are connected to the electrode body (21) on the side near the top cover plate (41). The first sub-support portion (321) abuts against one of the first side surfaces (2221), and the second sub-support portion (322) abuts against the other first side surface (2221).

4. The battery cell according to claim 3, characterized in that, The first limiting part (31) includes a first sub-limiting part (311) and a second sub-limiting part (312), both of which extend along the first direction (Z); The first sub-limiting part (311) and the second sub-limiting part (312) are connected and enclosed to form a limiting space (313), and the vertical part (221) passes through the limiting space (313); the first sub-limiting part (311) and the first sub-support part (321) are connected, and the second sub-limiting part (312) is connected to the second sub-support part (322).

5. The battery cell according to claim 4, characterized in that, The insulating limiting member (30) further includes a first sub-connecting part (331) and a second sub-connecting part (332); The first sub-connecting part (331) is connected between the first sub-support part (321) and the first sub-limiting part (311), and the second sub-connecting part (332) is connected between the second sub-support part (322) and the second sub-limiting part (312); The vertical portion (221) has two second side surfaces (2211) arranged opposite each other along the second direction (Y), the first sub-connecting portion (331) abuts against one of the second side surfaces (2211), and the second sub-connecting portion (332) abuts against the other second side surface (2211).

6. The battery cell according to claim 1, characterized in that, The electrode (22) also includes a flattening portion (223); The flattening part (223) is connected to the end of the vertical part (221) away from the converging part (222); The orthographic projection of the vertical portion (221) along the first direction (Z) onto the electrode body (21) is located within the orthographic projection range of the flattening portion (223) along the first direction (Z) onto the electrode body (21).

7. The battery cell according to claim 6, characterized in that, The pole post (42) has a groove (4221) on the side away from the electrode assembly (20). The groove (4221) is connected to the through hole (423). The flattening part (223) is located in the groove (4221) and welded to the pole post (42).

8. The battery cell according to claim 7, wherein the battery cell further has a third direction (X) perpendicular to the first direction (Z) and the second direction (Y), characterized in that, Along the first direction (Z) and from the electrode assembly (20) to the pole post (42), the width of the groove (4221) gradually increases along the third direction (X).

9. The battery cell according to claim 8, characterized in that, The pole post (42) includes a first pole post portion (421) and a second pole post portion (422) that are connected to each other. The first electrode post (421) is located on the side of the second electrode post (422) away from the electrode body (21). The second electrode post (422) is provided with the through hole (423). The second electrode post (422) is provided with the groove (4221) on the side facing the first electrode post (421). The flattening part (223) is electrically connected to the second electrode post (422). The first pole post (421) is provided with a clearance hole (4213) that extends through the first direction (Z). The clearance hole (4213) communicates with the groove (4221). Along the third direction (X), the groove wall of the groove (4221) and the hole wall of the clearance hole (4213) are spaced apart.

10. The battery cell according to claim 9, characterized in that, The first pole post (421) includes a main body (4211) and a second limiting part (4212); The main body (4211) passes through the top cover plate (41), the main body (4211) is connected to the side of the second pole post (422) away from the electrode assembly (20), the second limiting part (4212) protrudes from the end of the main body (4211) away from the electrode assembly (20), and the second limiting part (4212) is arranged around the main body (4211).

11. The battery cell according to claim 10, characterized in that, The top cover assembly (40) also includes a first insulating element (43); The first insulating member (43) is disposed around the pole post (42), and a portion of the first insulating member (43) is disposed between the second limiting portion (4212) and the top cover plate (41) along the first direction (Z).

12. The battery cell according to claim 11, characterized in that, The top cover (41) also includes a protrusion (412) and a body (413). The main body (413) is connected to the protrusion (412) and the housing (10) respectively. The main body (4211) passes through the protrusion (412) and the main body (413). The protrusion (412) protrudes at least partially on the side of the main body (413) away from the electrode assembly (20). The protrusion (412) is inclined relative to the first direction (Z). A portion of the first insulating member (43) is disposed between the protrusion (412) and the second limiting part (4212) along the first direction (Z).

13. The battery cell according to claim 9, characterized in that, The second pole post (422) has a limiting groove (4222), which is located on the side of the second pole post (422) near the electrode body (21). The limiting groove (4222) surrounds the through hole (423) and communicates with the through hole (423). A portion of the first limiting part (31) is embedded in the limiting groove (4222).

14. The battery cell according to claim 9, characterized in that, The top cover assembly (40) also includes a sealing cover (47); the sealing cover (47) connects to the side of the first pole post (421) away from the second pole post (422) and covers the clearance hole (4213).

15. The battery cell according to any one of claims 1-14, characterized in that, The top cover assembly (40) also includes a seal (45); The top cover plate (41) has a pole hole (411) extending along the first direction (Z), the wall of the pole hole (411) has a first inclined surface (411a), the first inclined surface (411a) is inclined relative to the first direction (Z); the outer peripheral surface of the pole (42) has a second inclined surface (4211a), the second inclined surface (4211a) is inclined relative to the first direction (Z); The sealing element (45) is arranged around the pole post (42), and the sealing element (45) is entirely located inside the pole post hole (411). The sealing element (45) is sealed and connected to the first inclined surface (411a) and the second inclined surface (4211a) respectively.

16. The battery cell according to claim 15, characterized in that, The top cover assembly (40) also includes a second insulating element (46). The seal (45) has a first end face (451) disposed near the electrode assembly (20), the second insulating member (46) is disposed around the pole post (42), at least a portion of the second insulating member (46) is located inside the housing (10), and the second insulating member (46) is connected to the side of the first end face (451) near the electrode assembly (20).

17. The battery cell according to claim 1, wherein the battery cell further has a third direction (X) perpendicular to the first direction (Z) and the second direction (Y), characterized in that, The length of the through hole (423) along the second direction (Y) is greater than the width along the third direction (X).

18. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1-17.

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