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, a cover plate assembly and a first insulating part, 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 sheet is connected with the shell and covers the accommodating cavity; the pole penetrates through the top cover plate and is electrically connected with the electrode assembly; the limiting piece is connected to the side, close to the electrode assembly, of the top cover piece. The first insulating part is arranged around the pole, is connected to one side, far away from the electrode assembly, of the top cover plate, and is connected with the top cover plate and the pole; the cover plate assembly further comprises an anti-torsion piece, the anti-torsion piece is connected to the side, away from the electrode assembly, of the top cover piece, and the anti-torsion piece is connected with the first insulating piece. According to the invention, the anti-torsion member is arranged, so that the possibility of relative movement of the pole penetrating through the first insulating member relative to the top cover sheet is reduced.

Description

Technical Field

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

[0002] The secondary battery includes terminals that are electrically connected to the electrode assembly inside the secondary battery, and the terminals are used to discharge the charge from the electrode assembly.

[0003] However, the terminals inserted into the top cover plate may move relative to the cover plate assembly, resulting in lower reliability of the secondary battery. 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 side of the top cover plate near the electrode assembly;

[0012] A first insulating element is disposed around the electrode post, and the first insulating element is connected to the side of the top cover plate away from the electrode assembly and is connected to the top cover plate and the electrode post;

[0013] The cover plate assembly further includes an anti-torsion member, which is connected to the side of the top cover plate away from the electrode assembly and is connected to the first insulating member.

[0014] In some embodiments, the top cover plate has a height direction, the first insulating member portion is disposed in the pole hole and between the top cover plate and the pole, and respectively connects the top cover plate and the pole;

[0015] A portion of the first insulating member is connected to the side of the top cover plate away from the electrode assembly and is connected to the anti-torsion member.

[0016] In some embodiments, the top cover sheet has a height direction, the first insulating member has a groove, the opening of the groove faces the top cover sheet along the height direction, and the anti-torsion member is embedded in the groove.

[0017] In some embodiments, the top cover has a height direction, and the limiting member includes:

[0018] A first limiting part is connected to the side of the top cover plate near the electrode assembly, and the first limiting part is arranged around the pole post;

[0019] 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.

[0020] In some embodiments, the secondary battery further includes a second insulating member, the second insulating member including a body portion and a third insulating portion, the body portion being located on the side of the top cover sheet facing the electrode assembly, the third insulating portion surrounding the electrode post and located between the second limiting portion and the electrode post, and connected to the second limiting portion.

[0021] In some embodiments, the second limiting portion has a limiting groove on the side away from the electrode assembly along the height direction, and the limiting groove surrounds the electrode post;

[0022] The second insulating member further includes a fourth insulating portion, which is connected to the third insulating portion in a direction perpendicular to the height direction, and the fourth insulating portion is located within the limiting groove.

[0023] In some embodiments, the cover plate assembly further includes a seal, a portion of which is connected to the second limiting portion on the side away from the electrode assembly along the height direction, a portion of which is connected to the fourth insulating portion on the side away from the electrode assembly along the height direction, and the seal is connected to the pole post on the side close to the electrode assembly along the height direction.

[0024] In some embodiments, the top cover sheet has a height direction, and the anti-torsion member includes:

[0025] A first anti-torsion part is arranged around the pole post, and the first anti-torsion part is spaced apart from the pole post in a direction perpendicular to the height direction. The first anti-torsion part is connected to the first insulating member.

[0026] The second anti-torsion part is connected to the side of the first anti-torsion part that is close to the pole post in a direction perpendicular to the height direction, and is spaced apart from the pole post; the second anti-torsion part is spaced apart from the top cover plate in the height direction, and is connected to the first insulating member.

[0027] In some embodiments, along the height direction, the top cover has a first surface facing away from the electrode assembly, and the electrode post hole penetrates the first surface; a portion of the second anti-torsion portion projected onto the first surface along the height direction is located within the electrode post hole.

[0028] Accordingly, this application also provides a battery pack, including a secondary battery as described in any of the above embodiments.

[0029] Beneficial Effects: Compared with the prior art, the secondary battery provided in this application includes a casing, an electrode assembly, a cover assembly, and a first insulating member. The casing 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 casing 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; the first insulating member is disposed around the terminal post, and is connected to the side of the top cover plate away from the electrode assembly, and is connected to the top cover plate and the terminal post; wherein, the cover assembly also includes an anti-torsion member, which is connected to the side of the top cover plate away from the electrode assembly, and is connected to the first insulating member. By providing an anti-torsion member, which is connected to the first insulating member, this application improves the connection reliability between the first insulating member and the cover assembly, thereby reducing the possibility of relative movement of the terminal post passing through the first insulating member relative to the top cover plate. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the structure of a secondary battery provided in an embodiment of this application;

[0032] Figure 2 An exploded view of the cover plate assembly in the secondary battery provided in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the cover plate assembly in the secondary battery provided in an embodiment of this application;

[0034] Figure 4 for Figure 3 Sectional view at point AA;

[0035] Figure 5 for Figure 4 Detailed view of section B in the middle frame;

[0036] Figure 6 This is a schematic diagram of the structure of the top cover plate in the secondary battery provided in the embodiments of this application;

[0037] Figure 7 for Figure 5 Detailed view of point C in the middle circle;

[0038] Figure 8 for Figure 4 Another detail image of section B in the middle frame;

[0039] Figure 9 This is a schematic diagram of the structure of the top cover plate in the secondary battery provided in the embodiments of this application;

[0040] Reference numerals in the attached drawings: 100-housing, 110-receiving cavity, 200-electrode assembly, 300-cover plate assembly, 310-top cover plate, 311-body portion, 312-electrode post hole, 313-first receiving groove, 314-first surface, 320-electrode post, 321-body, 322-flange, 330-first insulating element, 331-first insulating part, 332-second insulating part, 333-groove, 340-limiting element, 341-first connecting part, 342-first limiting part, 343-second limiting part, 344-connecting hole, 345-limiting groove, 350-anti-torsion element, 351-first anti-torsion part, 352-second anti-torsion part, 360-second insulating element, 361-third insulating part, 362-fourth insulating part, 363-body portion, 370-sealing element. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] However, the terminal post 320 inserted through the top cover plate 310 may move relative to the cover plate assembly 300, resulting in lower reliability of the secondary battery.

[0046] 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 relative movement 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.

[0047] The relative motion includes the rotation of the pole post 320 relative to the top cover plate 310, 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.

[0048] To address the technical problem of relative movement 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 312 for the terminal post; the terminal post 320 passes through the terminal post hole 312 and is connected to the electrode assembly 200. Electrical connection; limiting member 340 is connected to the side of top cover plate 310 near electrode assembly 200; first insulating member 330 is disposed around pole post 320, first insulating member 330 is connected to the side of top cover plate 310 away from electrode assembly 200, and is connected to top cover plate 310 and pole post 320; wherein, cover plate assembly 300 further includes anti-torsion member 350, anti-torsion member 350 is connected to the side of top cover plate 310 away from electrode assembly 200, and anti-torsion member 350 is connected to first insulating member 330.

[0049] 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 connecting hole 344 communicating with the electrode post hole 312, allowing the electrode post 320 to pass through the connecting hole 344 and electrically connect to the electrode assembly 200.

[0050] Wherein, the height direction Z is the direction of arrow Z in the attached figure.

[0051] 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.

[0052] 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 connects to the anti-torsion member 350 connected to the top cover plate 310. The anti-torsion member 350 is connected to the first insulating member 330, 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.

[0053] In some embodiments, please refer to Figure 5 The top cover plate 310 has a height direction Z, and the first insulating member 330 is partially disposed in the pole hole 312 and between the top cover plate 310 and the pole 320, and respectively connects the top cover plate 310 and the pole 320.

[0054] A portion of the first insulating member 330 is connected to the side of the top cover plate 310 away from the electrode assembly 200 and is connected to the anti-torsion member 350.

[0055] It should be noted that the first insulating member 330 may include a first insulating portion 331 and a second insulating portion 332, which are connected along the height direction Z. The first insulating portion 331 is disposed in the electrode post hole 312 and is disposed between the top cover plate 310 and the electrode post 320 along a direction perpendicular to the height direction Z, and is connected to the top cover plate 310 and the electrode post 320 respectively; a portion of the second insulating portion 332 is connected to the side of the first insulating portion 331 away from the electrode assembly 200 along the height direction Z, and a portion of the second insulating portion 332 is connected to the side of the top cover plate 310 away from the electrode assembly 200 along the height direction Z, and the second insulating portion 332 is connected to the anti-torsion member 350.

[0056] In some embodiments, please refer to Figure 6 The anti-torsion member 350 extends circumferentially along the pole post 320 and surrounds the pole post 320. The second insulating portion 332 is partially connected to the anti-torsion member 350 in the circumferential direction. Even if the second insulating portion 332 is only partially connected to the anti-torsion member 350, the second insulating portion 332 can increase the connection area between the first insulating member 330 and the top cover plate 310. In other embodiments, the second insulating portion 332 and the anti-torsion member 350 extend circumferentially along the pole post 320 and surround the pole post 320, and the second insulating portion 332 is connected to the anti-torsion member 350 in the circumferential direction to further increase the connection area between the second insulating portion 332 and the anti-torsion member 350.

[0057] In some embodiments, the second insulating portion 332 is connected to the side of the anti-torsion member 350 facing the pole post 320; in some embodiments, the second insulating portion 332 is connected to the side of the anti-torsion member 350 away from the top cover plate 310 along the height direction Z; in some embodiments, the second insulating portion 332 is connected to some parts of the anti-torsion member 350 away from the pole post 320; in other embodiments, the second insulating portion 332 covers the anti-torsion member 350.

[0058] In the above embodiment, the first insulating part 331 located in the pole hole 312 is used to wrap the pole 320 and indirectly connect the pole 320 and the top cover plate 310. The second insulating part 332 connected to the first insulating part 331 connects to the top cover plate 310 at the same time, increasing the connection area between the first insulating part 330 and the top cover plate 310, thereby improving the connection reliability between the first insulating part 330 and the top cover plate 310, and further reducing the possibility of relative movement between the pole 320 and the top cover plate 310 passing through the first insulating part 330.

[0059] In some embodiments, please refer to Figure 5 The top cover plate 310 has a height direction Z, the first insulating member 330 has a groove 333, the opening of the groove 333 faces the top cover plate 310 along the height direction Z, and the anti-torsion member 350 is embedded in the groove 333.

[0060] In some embodiments, the groove 333 is disposed on the second insulating portion 332, and the groove 333 is disposed on the surface of the second insulating portion 332 connected to the top cover plate 310.

[0061] In other words, the anti-torsion member 350 is connected to the first insulating member 330, thereby enhancing the reliability of the connection between the first insulating member 330 and the top cover plate 310.

[0062] In the above embodiment, by providing a groove 333 on the first insulating member 330 and embedding the anti-torsion member 350 in the groove 333, the connection area between the first insulating member 330 and the top cover plate 310 is further increased, thereby improving the connection reliability between the first insulating member 330 and the top cover plate 310, and thus reducing the possibility of relative movement between the pole post 320 passing through the first insulating member 330 and the top cover plate 310.

[0063] In some embodiments, please refer to Figure 5 The top cover plate 310 has a height direction Z. The limiting member 340 includes a first limiting part 342 and a second limiting part 343. The first limiting part 342 is connected to the side of the top cover plate 310 near the electrode assembly 200 and is arranged around the electrode post 320. The second limiting part 343 is connected to the side of the first limiting part 342 near the electrode assembly 200 and is arranged around the electrode post 320. The second limiting part 343 is located on the side of the electrode post 320 near the electrode assembly 200.

[0064] In the above embodiment, by providing a second limiting part 343 connected to the top cover plate 310 and located on the side of the pole post 320 near the electrode assembly 200, the relative movement of the pole post 320 relative to the top cover plate 310 towards the electrode assembly 200 in the height direction Z is restricted, thereby further reducing the possibility of relative movement between the pole post 320 and the top cover plate 310.

[0065] In some embodiments, the electrode post 320 includes a body 321 and a flange 322. The body 321 passes through the electrode post hole 312, and a second limiting portion 343 is disposed around the body so that the body 321 can pass through the second limiting portion 343 and be electrically connected to the electrode assembly 200. The flange 322 surrounds and is connected to the body 321. The flange 322 is disposed in the electrode post hole 312 and is disposed on the side of the second limiting portion 343 away from the electrode assembly 200, and is indirectly connected to the second limiting portion 343 through a seal 370.

[0066] In the above embodiment, the second limiting portion 343 provided on the side of the flange 322 near the electrode assembly 200 can limit the pole post 320 by limiting the flange 322 in the height direction Z.

[0067] In some embodiments, please refer again Figure 5 The first limiting member 340 also includes a first connecting part 341, which is connected to the side of the top cover plate 310 that is close to the electrode assembly 200 along the height direction Z, and the first limiting part 342 is connected to the side of the first connecting part 341 that is close to the electrode assembly 200 along the height direction Z.

[0068] In some embodiments, the first connecting portion 341 is disposed around the pole post 320.

[0069] In the above embodiment, by providing the first connecting part 341 to increase the connection area between the limiting member 340 and the top cover plate 310, the connection reliability between the limiting member 340 and the top cover plate 310 is improved, thereby further reducing the possibility of relative movement between the pole post 320 and the top cover plate 310.

[0070] In some embodiments, please refer again Figure 1 The top cover plate 310 has a first receiving groove 313 on the side of the electrode assembly 200 along the height direction Z. The first receiving groove 313 is arranged around the electrode post hole 312 and connected to the electrode post hole 312. The first connecting part 341 is embedded in the first receiving groove 313.

[0071] In the above embodiments, by setting the first receiving groove 313 to reduce the space occupied by the limiting member 340 in the height direction Z, the space utilization rate inside the secondary battery is higher and the structure of the secondary battery is more compact.

[0072] In some embodiments, please refer to Figure 5 and Figure 7 The secondary battery also includes a second insulating member 360, which includes a body portion 363311 and a third insulating portion 361. The body portion 363311 is located on the side of the top cover plate 310 facing the electrode assembly 200. The third insulating portion 361 surrounds the electrode post 320 and is located between the second limiting portion 343 and the electrode post 320, and is connected to the second limiting portion 343.

[0073] In the above embodiment, the second limiting part 343 can insulate the second limiting part 343 in the terminal post 320 and the limiting member 340 when the terminal post 320 is tilted in the terminal post hole 312, thereby improving the reliability of the secondary battery. At the same time, since the third insulating part 361 fills part of the gap between the terminal post 320 and the second limiting part 343, the third insulating part 361 can also limit the tilting range of the terminal post 320, thus achieving a limiting effect on the terminal post 320 and reducing the relative movement range of the terminal post 320 relative to the top cover plate 310.

[0074] In some embodiments, please refer to Figure 7 The second limiting part 343 has a limiting groove 345 on the side away from the electrode assembly 200 along the height direction Z, and the limiting groove 345 surrounds the pole post 320; the second insulating member 360 also includes a fourth insulating part 362, which is connected to the third insulating part 361 in a direction perpendicular to the height direction Z, and the fourth insulating part 362 is located in the limiting groove 345.

[0075] In the above embodiment, by providing a limiting groove 345 and embedding a portion of the second insulating member 360, namely the fourth insulating part 362, into the limiting groove 345, the second insulating member 360 and the limiting member 340 are prevented from separating in the height direction Z, making the connection between the limiting member 340 and the second insulating member 360 more reliable.

[0076] In some embodiments, please refer to Figure 7 The cover plate assembly 300 also includes a seal 370, a portion of which is connected to the side of the second limiting portion 343 away from the electrode assembly 200 along the height direction Z, and a portion of which is connected to the side of the fourth insulating portion 362 away from the electrode assembly 200 along the height direction Z; the seal 370 is connected to the side of the pole post 320 close to the electrode assembly 200 along the height direction Z.

[0077] In some embodiments, the seal 370 is a sealing ring, and the seal 370 is sleeved on the pole post 320.

[0078] In some embodiments, a portion of the seal 370 is sandwiched between the fourth insulating portion 362 and the pole post 320 along the height direction Z.

[0079] In the above embodiment, the sealing member 370 is provided to seal the connection between the limiting member 340 and the pole post 320. In addition, the sealing member 370 can also abut the fourth insulating part 362 against the second insulating part 332 of the limiting member 340 to further enhance the connection reliability between the limiting member 340 and the first insulating member 330 and prevent the limiting member 340 and the first insulating member 330 from separating.

[0080] In some embodiments, please refer to Figure 8 and Figure 9The top cover plate 310 has a height direction Z. The anti-torsion member 350 includes a first anti-torsion part 351 and a second anti-torsion part 352. The first anti-torsion part 351 is disposed around the pole post 320 and is spaced apart from the pole post 320 in a direction perpendicular to the height direction Z. The first anti-torsion part 351 is connected to the first insulating member 330. The second anti-torsion part 352 is connected to the side of the first anti-torsion part 351 that is close to the pole post 320 in a direction perpendicular to the height direction Z and is spaced apart from the pole post 320. The second anti-torsion part 352 is spaced apart from the top cover plate 310 in the height direction Z and is connected to the first insulating member 330.

[0081] In some embodiments, the second anti-torsion portion 352 can further increase the connection area between the first insulator 330 and the anti-torsion portion 350, thereby improving the connection reliability between the first insulator 330 and the top cover plate 310, and thus reducing the possibility of relative movement between the pole post 320 passing through the first insulator 330 and the top cover plate 310. Meanwhile, the second anti-torsion portion 352 connected to the side of the first anti-torsion portion 351 facing the pole post 320 will not increase the dimension of the first insulator 330 in the vertical height direction Z.

[0082] In some embodiments, please refer again Figure 8 and Figure 9 Along the height direction Z, the top cover plate 310 has a first surface 314 facing away from the electrode assembly 200, and the electrode post hole 312 penetrates the first surface 314; the portion of the second anti-torsion portion 352 projected along the height direction Z onto the first surface 314 is located inside the electrode post hole 312.

[0083] In the above embodiment, since the portion of the second anti-torsion part 352 projected along the height direction Z onto the first surface 314 is located inside the electrode hole 312, and a portion of the first insulating member 330 is connected to the side of the second anti-torsion part 352 that is close to the electrode assembly 200 along the height direction Z, the second anti-torsion part 352 can limit the first insulating member 330 from moving away from the electrode assembly 200 relative to the top cover plate 310 along the height direction Z. That is, the second anti-torsion part 352 can improve the limiting effect of the anti-torsion part 350 on the first insulating member 330, thereby further reducing the possibility of relative movement between the electrode post 320 passing through the first insulating member 330 and the top cover plate 310.

[0084] Accordingly, this application also provides a battery pack including a secondary battery as described in any of the above embodiments.

[0085] 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, include: 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 side of the top cover plate near the electrode assembly; A first insulating element is disposed around the electrode post, and the first insulating element is connected to the side of the top cover plate away from the electrode assembly and is connected to the top cover plate and the electrode post; The cover plate assembly further includes an anti-torsion member, which is connected to the side of the top cover plate away from the electrode assembly and is connected to the first insulating member.

2. The secondary battery according to claim 1, characterized in that, The top cover plate has a height direction, and the first insulating part is disposed in the pole hole and between the top cover plate and the pole, and respectively connects the top cover plate and the pole; A portion of the first insulating member is connected to the side of the top cover plate away from the electrode assembly and is connected to the anti-torsion member.

3. The secondary battery according to claim 1, characterized in that, The top cover has a height direction, the first insulating member has a groove, the opening of the groove faces the top cover along the height direction, and the anti-torsion member is embedded in the groove.

4. The secondary battery according to claim 1, characterized in that, The top cover has a height direction, and the limiting member includes: A first limiting part is connected to the side of the top cover plate near the electrode assembly, and the first limiting part is arranged around the pole post; 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.

5. The secondary battery according to claim 4, characterized in that, The secondary battery further includes a second insulating member, which includes a body portion and a third insulating portion. The body portion is located on the side of the top cover sheet facing the electrode assembly, and the third insulating portion surrounds the electrode post and is located between the second limiting portion and the electrode post, and is connected to the second limiting portion.

6. The secondary battery according to claim 5, characterized in that, The second limiting portion has a limiting groove on the side away from the electrode assembly along the height direction, and the limiting groove surrounds the electrode post; The second insulating member further includes a fourth insulating portion, which is connected to the third insulating portion in a direction perpendicular to the height direction, and the fourth insulating portion is located within the limiting groove.

7. The secondary battery according to claim 6, characterized in that, The cover plate assembly further includes a sealing element, a portion of which is connected to the second limiting portion on the side away from the electrode assembly along the height direction, a portion of which is connected to the fourth insulating portion on the side away from the electrode assembly along the height direction, and the sealing element is connected to the pole post on the side close to the electrode assembly along the height direction.

8. 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 first anti-torsion part is arranged around the pole post, and the first anti-torsion part is spaced apart from the pole post in a direction perpendicular to the height direction. The first anti-torsion part is connected to the first insulating member. The second anti-torsion part is connected to the side of the first anti-torsion part that is close to the pole post in a direction perpendicular to the height direction, and is spaced apart from the pole post; the second anti-torsion part is spaced apart from the top cover plate in the height direction, and is connected to the first insulating member.

9. The secondary battery according to claim 8, characterized in that, Along the height direction, the top cover has a first surface facing away from the electrode assembly, and the electrode post hole penetrates the first surface; the portion of the second anti-torsion portion projected onto the first surface along the height direction is located within the electrode post hole.

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

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