Secondary battery and battery pack

Abstract

The utility model discloses a secondary battery and a battery pack, and belongs to the technical field of batteries, the secondary battery comprises a shell, an electrode assembly and a cover plate assembly, the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the cover plate assembly comprises a top cover sheet, a pole and a limiting piece; the top cover plate is connected with the shell and covers the accommodating cavity, and a pole hole is formed in the top cover plate in a penetrating manner; the pole penetrates through the pole hole and is electrically connected with the electrode assembly; the limiting piece is connected to one side, close to the electrode assembly, of the top cover plate and surrounds the pole; the first insulating part is arranged in the pole hole, is connected with the top cover plate, and is arranged around the pole; the cover plate assembly further comprises an anti-torsion piece connected with the top cover piece, at least part of the anti-torsion piece is located in the pole hole, the anti-torsion piece and the pole are arranged in a spaced mode, the anti-torsion piece is provided with a limiting hole in a penetrating mode, and part of the first insulating piece is embedded in the limiting hole. According to the invention, the torsion-resistant member is arranged to increase the contact area of the first insulating member and the cover plate assembly, and the connection reliability is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to secondary batteries and battery packs. Background Technology

[0002] As power battery technology matures and is widely used in electric vehicles and energy storage, the requirements for the reliability and stability of power batteries are increasing.

[0003] However, in current secondary battery top covers, there is a problem of low reliability between the terminals and the top cover plates. Utility Model Content

[0004] The purpose of this utility model is to provide a secondary battery to solve the technical problem of relative movement between the terminal post and the cover plate assembly; another purpose of this application is to provide a battery pack.

[0005] Technical solution: This application provides a secondary battery, comprising:

[0006] A housing having a receiving cavity;

[0007] An electrode assembly disposed in the receiving cavity;

[0008] A cover plate assembly, the cover plate assembly including a top cover plate, a pole post and a limiting member;

[0009] The top cover is connected to the housing and seals the receiving cavity; the top cover has a through-hole for the pole post.

[0010] The electrode post passes through the electrode post hole and is electrically connected to the electrode assembly;

[0011] The limiting member is connected to the top cover plate on the side near the electrode assembly, and the limiting member surrounds the pole post;

[0012] A first insulating member, at least a portion of which is disposed within the electrode post hole and connected to the top cover plate, the first insulating member being disposed around the electrode post;

[0013] The cover plate assembly further includes an anti-torsion member connected to the top cover plate. At least a portion of the anti-torsion member is located in the pole hole and spaced apart from the pole. The anti-torsion member is provided with a limiting hole, and a portion of the first insulating member is embedded in the limiting hole.

[0014] In some embodiments, the limiting member includes:

[0015] A first limiting part is connected to the side of the top cover plate near the electrode assembly. The first limiting part is arranged around the pole post. A portion of the first insulating member is located between the first limiting part and the pole post, and abuts against the first limiting part and the pole post respectively.

[0016] The second limiting part is connected to the side of the first limiting part near the electrode assembly. The second limiting part is arranged around the electrode post and is located on the side of the electrode post near the electrode assembly.

[0017] In some embodiments, the top cover has a height direction, the anti-torsion member includes a body portion connected to the side of the top cover away from the electrode assembly along the height direction, the limiting hole extending through the body portion along the height direction, the limiting hole being located within the electrode post hole and communicating with the electrode post hole.

[0018] In some embodiments, the anti-torsion member further includes a fixing part, the body part is connected to the top cover piece through the fixing part, the fixing part is disposed around the body part, the body part is provided with a plurality of limiting holes, and the plurality of limiting holes are disposed at intervals along the circumference of the body part.

[0019] In some embodiments, the top cover plate is further provided with a second receiving groove communicating with the electrode hole. The second receiving groove is disposed on the side of the top cover plate away from the electrode assembly along the height direction, and the fixing part is embedded in the second receiving groove.

[0020] In some embodiments, the limiting hole extends circumferentially along the pole post.

[0021] In some embodiments, the top cover has a height direction, the anti-torsion member is connected to the hole wall of the pole hole in a direction perpendicular to the height direction, and the limiting hole passes through the anti-torsion member in the height direction.

[0022] In some embodiments, the cover plate assembly includes a plurality of anti-torsion members, which are spaced apart circumferentially along the pole post.

[0023] In some embodiments, the top cover sheet further has a height direction, and the surface of the first insulating member away from the electrode assembly along the height direction is flush with the surface of the top cover sheet away from the electrode assembly along the height direction.

[0024] Accordingly, this application also provides a battery pack, which includes a secondary battery as described in any of the above embodiments.

[0025] Beneficial effects: Compared with the prior art, the secondary battery provided in this application includes a shell, an electrode assembly, and a cover assembly. The shell has a receiving cavity; the electrode assembly is disposed in the receiving cavity; the cover assembly includes a top cover plate, a terminal post, and a limiting member; the top cover plate is connected to the shell and seals the receiving cavity, and the top cover plate has a through-hole for the terminal post; the terminal post passes through the terminal post hole and is electrically connected to the electrode assembly; the limiting member is connected to the side of the top cover plate near the electrode assembly and surrounds the terminal post; at least a portion of the first insulating member is disposed in the terminal post hole and is connected to the top cover plate, and the first insulating member surrounds the terminal post; wherein, the cover assembly also includes an anti-torsion member connected to the top cover plate, at least a portion of the anti-torsion member is located in the terminal post hole and is spaced apart from the terminal post, the anti-torsion member has a through-hole for the limiting member, and a portion of the first insulating member is embedded in the limiting hole. This application increases the contact area between the first insulating member and the cover plate assembly by providing an anti-torsion member connected to the top cover plate, thereby making the connection between the first insulating member and the cover plate assembly more reliable and reducing the possibility of relative movement between the pole post passing through the first insulating member and the top cover plate. Attached Figure Description

[0026] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of a secondary battery provided in an embodiment of this application;

[0028] Figure 2 A schematic diagram showing the disassembled cover plate assembly in a secondary battery provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of the cover plate assembly in a secondary battery according to an embodiment of this application;

[0030] Figure 4 for Figure 3 Sectional view at point AA;

[0031] Figure 5 for Figure 4 Detailed view of section B in the middle frame;

[0032] Figure 6 This is a schematic diagram of the structure of the top cover plate of a secondary battery at one angle according to an embodiment of this application;

[0033] Figure 7 This is a schematic diagram of the top cover plate of a secondary battery from another angle, provided in one embodiment of this application.

[0034] Figure 8 This is a cross-sectional view of the top cover plate in a secondary battery provided in an embodiment of this application;

[0035] Figure 9for Figure 8 Detailed view of section C in the middle frame;

[0036] Figure 10 This is a schematic diagram of the structure of the first insulating element in a secondary battery according to an embodiment of this application;

[0037] Figure 11 This is a schematic diagram of the structure of the cover plate assembly in a secondary battery according to another embodiment of this application;

[0038] Figure 12 for Figure 11 Sectional view at FF;

[0039] Figure 13 for Figure 12 Detailed view of section G in the middle frame;

[0040] Figure 14 This is a schematic diagram of the structure of the top cover plate in a secondary battery according to another embodiment of this application;

[0041] Figure 15 This is a schematic diagram of the anti-torsion component in a secondary battery provided in another embodiment of this application;

[0042] Figure 16 A cross-sectional view of the first insulating member in a secondary battery provided in another embodiment of this application;

[0043] Figure 17 A cross-sectional view of the limiting member in a secondary battery provided in an embodiment of this application;

[0044] Reference numerals in the attached drawings: 100-shell, 110-receiving cavity, 200-electrode assembly, 300-cover plate assembly, 310-top cover plate, 311-electrode post hole, 312-first receiving groove, 313-second receiving groove, 320-electrode post, 321-body, 322-flange, 330-first insulating element, 331-groove, 332-wrapping part, 333-through part, 334-first groove wall, 335-second groove wall, 340-limiting element, 341-first connecting part, 342-first limiting part, 343-second limiting part, 344-connecting hole, 350-anti-torsion element, 351-limiting hole, 352-through hole, 353-fixing part, 354-body part, 360-second insulating element, 370-sealing element. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" 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, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0047] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0048] The secondary battery includes a terminal post 320 electrically connected to an electrode assembly 200 inside the secondary battery, the terminal post 320 being used to conduct electrical charge from the electrode assembly 200.

[0049] However, the terminal post 320 inserted into the top cover plate 310 may be displaced relative to the top cover plate 310, resulting in low reliability of the secondary battery.

[0050] Specifically, in some embodiments, the portion of the terminal post 320 located inside the secondary battery is welded to the tab or connecting piece, while the portion of the terminal post 320 located outside the secondary battery is welded to other electrical components. If a relative displacement occurs between the terminal post 320 and the top cover plate 310, the reliability of the connection between the terminal post 320 and the tab, connecting piece, and other electrical components may decrease, resulting in lower reliability of the secondary battery.

[0051] The relative displacement includes the rotation of the pole post 320 relative to the top cover, and the movement of the pole post 320 relative to the top cover plate 310 along the height direction Z or along a direction perpendicular to the height direction Z.

[0052] To address the technical problem of relative displacement between the electrode post 320 and the top cover plate 310, embodiments of this application provide a secondary battery. Please refer to [link to relevant documentation]. Figure 1 and Figure 2The secondary battery includes a housing 100, an electrode assembly 200, a cover assembly 300, and a first insulating member 330. The housing 100 has a receiving cavity 110; the electrode assembly 200 is disposed in the receiving cavity 110; the cover assembly 300 includes a top cover plate 310, a terminal post 320, and a limiting member 340; the top cover plate 310 is connected to the housing 100 and covers the receiving cavity 110, and the top cover plate 310 has a through-hole 311 for the terminal post; the terminal post 320 passes through the terminal post hole 311 and is electrically connected to the electrode assembly 200; the limiting member 340 is connected to the top cover plate 310 near the terminal post 200. On one side of the pole assembly 200, a limiting member 340 surrounds the pole post 320; at least a portion of the first insulating member 330 is disposed in the pole post hole 311, and the first insulating member 330 is connected to the top cover plate 310, and the first insulating member 330 surrounds the pole post 320; wherein, the cover plate assembly 300 further includes an anti-torsion member 350 connected to the top cover plate 310, at least a portion of the anti-torsion member 350 is located in the pole post hole 311 and is spaced apart from the pole post 320, the anti-torsion member 350 is provided with a limiting hole 351 through it, and a portion of the first insulating member 330 is embedded in the limiting hole 351.

[0053] In some embodiments, a portion of the electrode post 320 is located on the side of the limiting member 340 away from the electrode assembly 200, and is connected to the side of the electrode post 320 near the electrode assembly 200 via a sealing member 370, thereby limiting the electrode post 320 along the height direction Z. Furthermore, the limiting member 340 surrounds the electrode post 320 and forms a connection hole 344, allowing the electrode post 320 to pass through the connection hole 344 and electrically connect to the electrode assembly 200.

[0054] Wherein, the height direction Z is the direction of arrow Z in the attached figure.

[0055] The first insulating element 330 is disposed around the pole post 320 so that the pole post 320 is connected to the top cover plate 310 through the first insulating element 330.

[0056] In the above embodiment, the first insulating member 330 not only connects to the top cover plate 310 in the cover plate assembly 300, but also to the anti-torsion member 350 connected to the top cover plate 310. The anti-torsion member 350 increases the connection area between the first insulating member 330 and the cover plate assembly 300, making the connection between the first insulating member 330 and the cover plate assembly 300 more reliable and reducing the possibility of relative movement between the first insulating member 330 and the cover plate assembly 300. This, in turn, reduces the possibility of relative movement between the pole post 320 surrounded by the first insulating member 330 and the top cover plate 310. The relative movement between the pole post 320 and the top cover plate 310 includes relative rotation and relative movement.

[0057] In some embodiments, please refer to Figure 3 , Figure 4 , Figure 5 , Figure 11 , Figure 12 and Figure 13 , Figure 5 and Figure 13 These are detailed drawings of the electrode post 320 portion in the embodiments provided in this application. The limiting member 340 includes a first limiting part 342 and a second limiting part 343, which are connected to the top cover plate 310 on the side near the electrode assembly 200. The first limiting part 342 is disposed around the electrode post 320. A portion of the first insulating member 330 is located between the first limiting part 342 and the electrode post 320, and abuts against the first limiting part 342 and the electrode post 320 respectively. The second limiting part 343 is disposed around the electrode post 320 and forms a connecting hole 344. The second limiting part 343 is located on the side of the electrode post 320 near the electrode assembly 200.

[0058] In some embodiments, please refer to Figure 17 The first limiting part 342 extends along the height direction Z, and a portion of the first insulating member 330 is located between the first limiting part 342 and the pole post 320 in a direction perpendicular to the height direction Z, and is connected to the first limiting part 342 and the pole post 320 respectively.

[0059] In some embodiments, the cover plate assembly 300 further includes a sealing member 370, which is disposed along the height direction Z between the second limiting portion 343 and the electrode post 320, and respectively seals and connects the second limiting portion 343 and the electrode post 320. Specifically, the electrode post 320 includes a body 321 and a flange 322, the flange 322 surrounds the body 321 and is connected to the body 321, the sealing member 370 is connected along the height direction Z between the flange 322 and the second limiting portion 343; the flange 322 is sandwiched between the sealing member 370 and the first insulating member 330 along the height direction Z; the second limiting portion 343 is disposed around the body 321, and the body 321 passes through the connecting hole 344 of the second limiting portion 343 and is electrically connected to the electrode assembly 200.

[0060] In the above embodiment, the second limiting part 343 of the limiting member 340 can limit the pole post 320 along the height direction Z, preventing the pole post 320 from moving towards the pole post 320 along the height direction Z, and further reducing the possibility of the pole post 320 passing through the first insulating member 330 moving relative to the top cover plate 310.

[0061] In some embodiments, please refer to Figure 17 Please refer to it again. Figure 5 and Figure 13The limiting member 340 also includes a first connecting part 341, which is arranged around the electrode post 320. The first limiting part 342 is connected to the top cover plate 310 through the first connecting part 341. The first connecting part 341 is connected to the side of the top cover plate 310 near the electrode assembly 200, and the first limiting part 342 is connected to the side of the first connecting part 341 near the electrode assembly 200.

[0062] In the above embodiment, by setting the first connecting part 341 to connect the first limiting part 342 and the top cover piece 310, the connection area between the limiting member 340 and the top cover piece 310 can be further increased, thereby making the connection between the limiting member 340 and the top cover piece 310 more reliable, and thus making the limiting member 340 have a better limiting effect on the pole post 320.

[0063] In some embodiments, please refer again Figure 5 and Figure 13 And see Figure 14 The top cover plate 310 is provided with a first receiving groove 312 on the side near the electrode assembly 200. The first receiving groove 312 surrounds the electrode post hole 311 and communicates with the electrode post hole 311. The first connecting part 341 is embedded in the first receiving groove 312.

[0064] In the above embodiment, by setting the first receiving groove 312, the space occupied by the limiting member 340 in the height direction Z is reduced, thereby improving the space utilization rate inside the secondary battery.

[0065] In some embodiments, please refer to Figure 13 The top cover plate 310 has a height direction Z, and the anti-torsion member 350 includes a body portion 354. The body portion 354 is connected to the side of the top cover plate 310 away from the electrode assembly 200 along the height direction Z. The limiting hole 351 extends through the body portion 354 along the height direction Z. The limiting hole 351 is located inside the electrode post hole 311 and communicates with the electrode post hole 311.

[0066] In some embodiments, a portion of the pole post 320 is disposed between the body portion 354 and the limiting member 340 along the height direction Z, and the body portion 354 is connected to a portion of the pole post 320 via a first insulating member 330.

[0067] In some embodiments, the body portion 354 surrounds the pole post 320 and forms a through hole 352, with a portion of the pole post 320 passing through the through hole 352. Specifically, the body portion 321 of the pole post 320 passes through the through hole 352.

[0068] In the above embodiment, the body portion 354 connected to the side of the top cover plate 310 away from the electrode assembly 200 along the height direction Z can restrict the pole post 320 from moving away from the electrode assembly 200 along the height direction Z, further improving the limiting effect of the anti-torsion member 350 on the pole post 320, thereby further reducing the possibility of the pole post 320 moving relative to the cover plate assembly 300. At the same time, the limiting hole 351 on the body portion 354, which communicates with the pole post hole 311, allows a portion of the first insulating member 330 to pass through the limiting hole 351 when the first insulating member 330 is formed. The portion of the first insulating member 330 passing through the limiting hole 351 can prevent relative rotation between the first insulating member 330 and the body portion 354, thereby further reducing the possibility of the pole post 320 passing through the first insulating member 330 moving relative to the top cover plate 310.

[0069] In some embodiments, please refer to the figure, the anti-torsion member 350 further includes a fixing part 353, the body part 354 is connected to the top cover piece 310 through the fixing part 353, the fixing part 353 is disposed around the body part 354, the body part 354 is provided with a plurality of limiting holes 351, and the plurality of limiting holes 351 are disposed at intervals along the circumference of the body part 354.

[0070] Specifically, the main body 354 is connected to the top cover 310 via the fixing part 353, which is connected to the side of the main body 354 away from the pole post 320 in a direction perpendicular to the height direction Z.

[0071] In the above embodiment, by providing the fixing part 353, the main body part 354 can be more firmly connected to the top cover plate 310, and the main body part 354 can extend further into the pole hole 311 in the direction perpendicular to the height direction Z, further increasing the connection area between the anti-torsion member 350 and the first insulating member 330, thereby improving the connection reliability between the first insulating member 330 and the anti-torsion member 350 and reducing the possibility of relative movement of the pole 320 relative to the cover plate assembly 300. At the same time, the multiple limiting holes 351 allow more of the first insulating member 330 to pass through the limiting holes 351, further increasing the connection area between the anti-torsion member 350 and the first insulating member 330, thereby improving the connection reliability between the first insulating member 330 and the anti-torsion member 350 and reducing the possibility of relative movement of the pole 320 passing through the first insulating member 330 relative to the top cover plate 310.

[0072] In some embodiments, the maximum distance between the body portion 354 and the limiting member 340 along the height direction Z is less than the maximum distance between the fixing portion 353 and the limiting member 340. Furthermore, a portion of the first insulating member 330 is connected to the side of the body portion 354 away from the electrode assembly 200 along the height direction Z.

[0073] In the above embodiment, since the maximum distance between the main body 354 and the limiting member 340 is less than the maximum distance between the fixing part 353 and the limiting member 340, the surface of the main body 354 away from the limiting member 340 along the height direction Z is lower than the surface of the fixing part 353 away from the limiting member 340 along the height direction Z. When the first insulating member 330 is connected to the surface of the main body 354 away from the limiting member 340 along the height direction Z, the portion of the first insulating member 330 connected to the surface of the main body 354 away from the limiting member 340 along the height direction Z will not increase the outer dimension of the secondary battery along the height direction Z by much. Even when the surface of the first insulating member 330 away from the limiting member 340 along the height direction Z is flush with the surface of the fixing part 353 away from the limiting member 340 along the height direction Z, the secondary battery will not increase its outer dimension along the height direction Z solely because of the first insulating member 330. While the first insulating member 330 and the anti-torsion member 350 have a large connection area, the outer dimension of the secondary battery is also smaller, and the structure is more compact.

[0074] In some embodiments, please refer again Figure 7 and Figure 13 The top cover plate 310 is also provided with a second receiving groove 313 that communicates with the electrode post hole 311. The second receiving groove 313 is located on the side of the top cover plate 310 away from the electrode assembly 200 along the height direction Z. The fixing part 353 is embedded in the second receiving groove 313.

[0075] In some embodiments, the surface of the fixing portion 353 embedded in the second receiving groove 313 away from the electrode assembly 200 is flush with the surface of the top cover 310 away from the electrode assembly 200.

[0076] In the above embodiments, by providing a second receiving groove 313 to reduce or even avoid the anti-torsion member 350 increasing the size of the secondary battery in the height direction Z, the secondary battery becomes smaller and the structure is more compact.

[0077] In some embodiments, please refer to Figure 15 The limiting hole 351 extends circumferentially along the pole post 320. Specifically, the circumferential direction of the pole post 320 is the direction in which the side circumferential surface of the pole post 320 surrounds the pole post 320.

[0078] In the above embodiment, by extending the limiting hole 351 along the circumference of the pole post 320 to expand the area of ​​the limiting hole 351, the portion of the first insulating member 330 passing through the limiting hole 351 has better mechanical properties, thereby obtaining better anti-torsion properties, and thus reducing the possibility of the pole post 320 passing through the first insulating member 330 rotating relative to the top cover plate 310.

[0079] In some embodiments, please refer to Figure 10 and Figure 16The first insulating member 330 includes a wrapping part 332 and a through part 333. The wrapping part 332 wraps the pole post 320 and is embedded in the pole post hole 311. A groove 331 is formed on the side peripheral surface of the wrapping part 332. Part of the anti-torsion member 350 is embedded in the groove 331. The groove 331 has a first groove wall 334 and a second groove wall 335 that are opposite to each other along the height direction Z. The through part 333 is disposed between the first groove wall 334 and the second groove wall 335 along the height direction Z and connects the first groove wall 334 and the second groove wall 335 respectively. The through part 333 is embedded in the limiting hole 351.

[0080] In some embodiments, the groove 331 is formed by a portion of the anti-torsion member 350, and the through portion 333 is formed by the limiting hole 351; specifically, the groove 331 is formed to avoid the portion of the anti-torsion member 350 located in the pole hole 311 when the first insulating member 330 is formed; the through portion 333 is formed by the first insulating member 330 entering the limiting hole 351 when the first insulating member 330 is formed.

[0081] In the above embodiments, the first insulating member 330 with the groove 331 and the through portion 333 further increases the connection area between the first insulating member 330 and the anti-torsion member 350, thereby improving the connection reliability between the first insulating member 330 and the anti-torsion member 350, and thus reducing the possibility of relative movement between the pole post 320 and the top cover plate 310 passing through the first insulating member 330.

[0082] In some embodiments, please refer to Figure 5 , Figure 6 and Figure 7 The top cover plate 310 has a height direction Z, the anti-torsion member 350 is connected to the hole wall of the pole hole 311 in a direction perpendicular to the height direction Z, and the limiting hole 351 passes through the anti-torsion member 350 in the height direction Z.

[0083] In some embodiments, please refer to Figure 8 and Figure 9 The anti-torsion component 350 and the top cover plate 310 are an integral structure.

[0084] In the above embodiment, the anti-torsion member 350 disposed inside the electrode hole 311 can avoid increasing the volume of the secondary battery in the height direction Z, and can also avoid the anti-torsion member 350 occupying the volume of the receiving cavity 110, thereby making the secondary battery smaller and the space utilization rate higher.

[0085] In some embodiments, please refer to Figure 6 and Figure 7 The cover plate assembly 300 includes a plurality of anti-torsion members 350, which are spaced apart circumferentially along the pole post 320.

[0086] In the above embodiments, by providing multiple anti-torsion members 350 to further increase the connection area between the first insulating member 330 and the cover plate assembly 300, the connection reliability between the first insulating member 330 and the anti-torsion member 350 is improved, thereby reducing the possibility of relative movement between the pole post 320 passing through the first insulating member 330 and the top cover plate 310.

[0087] In some embodiments, please refer to Figure 5 and Figure 13 The top cover 310 also has a height direction Z, and the surface of the first insulating member 330 away from the electrode assembly 200 along the height direction Z is flush with the surface of the top cover 310 away from the electrode assembly 200 along the height direction Z.

[0088] In some embodiments, the surface of the electrode post 320 that is furthest from the electrode assembly 200 along the height direction Z is flush with the surface of the top cover plate 310 that is furthest from the electrode assembly 200 along the height direction Z.

[0089] In the above embodiments, by making the surface of the electrode post 320 away from the electrode assembly 200 along the height direction Z flush with the surface of the top cover plate 310 away from the electrode assembly 200 along the height direction Z, the external dimension of the secondary battery in the height direction Z can be reduced, thereby making the structure of the secondary battery more compact.

[0090] In some embodiments, please refer to Figure 5 and Figure 13 The secondary battery also includes a second insulating member 360, which is at least connected to the limiting member 340 and the top cover plate 310 on the side facing the electrode assembly 200 in the height direction Z.

[0091] Accordingly, this application also provides a battery pack, which includes a secondary battery as described in any of the above embodiments.

[0092] The above provides a detailed description of a secondary battery and battery pack provided in the embodiments of this application. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A secondary battery, characterized in that, The secondary battery includes: A housing having a receiving cavity; An electrode assembly disposed in the receiving cavity; A cover plate assembly, the cover plate assembly including a top cover plate, a pole post and a limiting member; The top cover is connected to the housing and seals the receiving cavity; the top cover has a through-hole for the pole post. The electrode post passes through the electrode post hole and is electrically connected to the electrode assembly; The limiting member is connected to the top cover plate on the side near the electrode assembly, and the limiting member surrounds the pole post; A first insulating member, at least a portion of which is disposed within the electrode post hole and connected to the top cover plate, the first insulating member being disposed around the electrode post; The cover plate assembly further includes an anti-torsion member connected to the top cover plate. At least a portion of the anti-torsion member is located in the pole hole and spaced apart from the pole. The anti-torsion member is provided with a limiting hole, and a portion of the first insulating member is embedded in the limiting hole.

2. The secondary battery according to claim 1, characterized in that, The limiting component includes: A first limiting part is connected to the side of the top cover plate near the electrode assembly. The first limiting part is arranged around the pole post. A portion of the first insulating member is located between the first limiting part and the pole post, and abuts against the first limiting part and the pole post respectively. The second limiting part is connected to the side of the first limiting part near the electrode assembly. The second limiting part is arranged around the electrode post and is located on the side of the electrode post near the electrode assembly.

3. The secondary battery according to claim 1, characterized in that, The top cover plate has a height direction, and the anti-torsion member includes a body portion connected to the side of the top cover plate away from the electrode assembly along the height direction. The limiting hole extends through the body portion along the height direction, is located inside the electrode post hole, and communicates with the electrode post hole.

4. The secondary battery according to claim 3, characterized in that, The anti-torsion component also includes a fixing part, the main body is connected to the top cover plate through the fixing part, the fixing part is arranged around the main body, the main body is provided with a plurality of limiting holes, and the plurality of limiting holes are arranged at intervals along the circumference of the main body.

5. The secondary battery according to claim 4, characterized in that, The top cover plate is also provided with a second receiving groove that communicates with the electrode post hole. The second receiving groove is located on the side of the top cover plate away from the electrode assembly along the height direction, and the fixing part is embedded in the second receiving groove.

6. The secondary battery according to claim 3, characterized in that, The limiting hole extends circumferentially along the pole post.

7. The secondary battery according to claim 1, characterized in that, The top cover plate has a height direction, the anti-torsion member is connected to the hole wall of the pole hole in a direction perpendicular to the height direction, and the limiting hole passes through the anti-torsion member in the height direction.

8. The secondary battery according to claim 7, characterized in that, The cover plate assembly includes a plurality of anti-torsion members, which are spaced apart circumferentially along the pole post.

9. The secondary battery according to claim 1, characterized in that, The top cover also has a height direction, wherein the surface of the first insulating member away from the electrode assembly along the height direction is flush with the surface of the top cover away from the electrode assembly along the height direction.

10. A battery pack, characterized in that, The battery pack includes the secondary battery as described in any one of claims 1-9.

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