Battery and battery pack

Abstract

The present application belongs to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises: a housing, having an accommodating cavity and an opening; an electrode assembly, provided in the accommodating cavity; a top cover plate, covering the opening and provided with an electrode post hole; an electrode post, passing through the electrode post hole and connected to the electrode assembly; a first limiting member, comprising a first limiting portion and a second limiting portion, the second limiting portion being connected to the top cover plate, the first limiting portion and the top cover plate forming a limiting groove, and a part of the electrode post being embedded in the limiting groove; and a first insulating member, partially penetrating through the electrode post hole and surrounding the electrode post. One of the top cover plate and the first insulating member is provided with a first protruding portion, and the other is provided with a first recess into which the first protruding portion is embedded. One of the electrode post and the first insulating member is provided with a second protruding portion, and the other is provided with a second recess into which the second protruding portion is embedded. In the present application, by means of embedding the first protruding portion and the first recess and the second protruding portion and the second recess, mutual limitation between the top cover plate, the electrode post, and the first insulating member is formed, thereby improving the torsion resistance of the electrode post.

Description

Battery and battery pack

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202421465297.4, filed on June 25, 2024, and entitled "A battery and battery pack", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of batteries, and in particular relates to a battery and battery pack. BACKGROUND

[0004] In the battery structure, the pole post is usually connected to the top cover of the battery by a riveting process. As an important conductive structure, the pole post needs to be connected to various conductive structures. When the battery is applied in the automotive field, for example, it is often in a vibrating state, and the pole post needs to withstand the circumferential torsional force, and there is a risk of the pole post and the battery top cover being separated. Therefore, the torsional resistance of the pole post assembly structure directly affects the yield rate of battery manufacturing and the safety in use. SUMMARY

[0005] The present application aims to solve the above technical problems. Another object of the present application is to provide a battery pack using the above battery.

[0006] Technical solution: The battery provided by the embodiments of the present application has a first direction, and comprises:

[0007] A housing having a receiving cavity and an opening, wherein the opening is in communication with the receiving cavity;

[0008] An electrode assembly arranged in the receiving cavity;

[0009] A top cover sheet arranged on the opening, wherein the top cover sheet is provided with a pole post hole, and the pole post hole penetrates through the top cover sheet in the first direction;

[0010] A pole post partially arranged in the pole post hole, and connected to the electrode assembly;

[0011] A first limiting member located on the side of the top cover sheet facing the electrode assembly, wherein the first limiting member comprises a first limiting portion and a second limiting portion, the second limiting portion surrounds the first limiting portion, the second limiting portion is connected to the top cover sheet and surrounds the pole post, the first limiting portion and the top cover sheet form a limiting groove in the first direction, and part of the pole post is embedded in the limiting groove;

[0012] A first insulating member, a portion of the first insulating member being arranged through the pole hole and surrounding the pole, at least a portion of the first insulating member abutting between the top cover sheet and the pole;

[0013] One of the top cover sheet and the first insulating member is provided with a first protrusion, and the other is provided with a first groove in which the first protrusion is embedded, and one of the pole and the first insulating member is provided with a second protrusion, and the other is provided with a second groove in which the second protrusion is embedded.

[0014] In some embodiments, the first protrusion and the second protrusion are respectively provided on the first insulating member, the first groove is provided on the top cover sheet, and the second groove is provided on the pole.

[0015] In some embodiments, the first protrusion, the second protrusion, the first groove, and the second groove are respectively provided with a plurality of, and each of the first protrusions is respectively embedded in one of the first grooves, and each of the second protrusions is respectively embedded in one of the second grooves.

[0016] In some embodiments, a plurality of the first protrusions are distributed at intervals around the pole;

[0017] And / or, a plurality of the second protrusions are distributed at intervals around the pole.

[0018] In some embodiments, the pole includes a first column portion, a second column portion, and a third column portion arranged in a first direction, the first column portion is located on a side of the third column portion away from the electrode assembly, and the second column portion is at least partially located in the limiting groove.

[0019] The first insulating member includes a first insulating portion surrounding the first column portion, the first insulating portion abutting the first column portion and the top cover sheet, and the first protrusion and the second protrusion are respectively provided on the first insulating portion.

[0020] In some embodiments, the first insulating member further includes a second insulating portion, the second insulating portion is connected to a side of the first insulating portion away from the first column portion, the second insulating portion is at least partially arranged in the limiting groove, and the second insulating portion abuts the second column portion and the top cover sheet.

[0021] In some embodiments, a ring groove is formed on a side of the top cover sheet facing the electrode assembly, the ring groove surrounds the pole hole and communicates with the pole hole;

[0022] The first limiting member further includes a third limiting portion surrounding the pole, the third limiting portion is connected to a side of the second limiting portion away from the first limiting portion, the third limiting portion is embedded in the ring groove and connected to the top cover sheet.

[0023] In some embodiments, the battery further comprises:

[0024] A sealing member is arranged in the limiting groove, the sealing member comprises a first sealing part and a second sealing part connected with each other, the first sealing part is arranged between the second column part and the second limiting part, and the first sealing part abuts against the second column part and the second limiting part, the second sealing part is arranged between the first limiting part and the second column part, and the second sealing part abuts against the first limiting part and the second column part.

[0025] In some embodiments, the battery further comprises:

[0026] A second insulation member comprises a third insulation part and a fourth insulation part connected with each other, the third insulation part is arranged on a side of the top cover sheet facing the electrode assembly, and the third insulation part covers the first limiting member, at least a part of the fourth insulation part is arranged between the first limiting part and the third column part, and the fourth insulation part surrounds the third column part.

[0027] In some embodiments, a part of the first insulation member is embedded in the limiting groove, one of the first insulation member and the first limiting member is provided with a third protrusion, and the other is provided with a third groove for embedding the third protrusion.

[0028] In some embodiments, the first protrusion is arranged on the top cover sheet, the second protrusion is arranged on the pole column, and the first groove and the second groove are arranged on the first insulation member for embedding the first protrusion and the second protrusion, respectively.

[0029] In some embodiments, the first protrusion is arranged on the top cover sheet, the second protrusion is arranged on the first insulation member, the first groove is arranged on the first insulation member, and the second groove is arranged on the pole column.

[0030] In some embodiments, the first protrusion is arranged on the first insulation member, the second protrusion is arranged on the pole column, the first groove is arranged on the top cover sheet, and the second groove is arranged on the first insulation member.

[0031] Correspondingly, the battery pack provided by the embodiments of the present application comprises the battery described above.

[0032] Beneficial effects: the battery of the embodiment of the application comprises a shell, an electrode assembly, a top cover sheet, a pole, a first limiting piece and a first insulating piece. The shell has a containing cavity and an opening, the opening is communicated with the containing cavity, the electrode assembly is arranged in the containing cavity, and the top cover sheet is arranged on the opening. The top cover sheet is provided with a pole hole, the pole is partially arranged in the pole hole and connected with the electrode assembly. The first limiting piece is located on the side of the top cover sheet facing the electrode assembly, the first limiting piece comprises a first limiting part and a second limiting part, the second limiting part surrounds the first limiting part, the second limiting part is connected with the top cover sheet and surrounds the pole, the first limiting part and the top cover sheet form a limiting groove in the first direction, and part of the pole is embedded in the limiting groove. Part of the first insulating piece is arranged in the pole hole and surrounds the pole, and at least part of the first insulating piece abuts between the top cover sheet and the pole; one of the top cover sheet and the first insulating piece is provided with a first protrusion, and the other is provided with a first groove for embedding the first protrusion; one of the pole and the first insulating piece is provided with a second protrusion, and the other is provided with a second groove for embedding the second protrusion. By embedding the first protrusion in the first groove and the second protrusion in the second groove, a mutual limiting action is formed between the top cover sheet, the pole and the first insulating piece, so that the torsional resistance of the pole is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0034] Fig. 1 is a structural schematic diagram of the battery of the embodiment of the application;

[0035] Fig. 2 is an exploded structural schematic diagram of the battery of the embodiment of the application;

[0036] Fig. 3 is a structural schematic diagram of the top cover structure of the embodiment of the application;

[0037] Fig. 4 is a partial sectional view along line A-A in Fig. 3;

[0038] Fig. 5 is an exploded structural schematic diagram of the pole, the first limiting piece, the first insulating piece and the sealing piece of the embodiment of the application;

[0039] Fig. 6 is a structural schematic diagram of the top cover sheet of the embodiment of the application;

[0040] Fig. 7 is a structural schematic diagram of the top cover structure of another embodiment of the application;

[0041] Fig. 8 is a partial sectional view along line B-B in Fig. 7;

[0042] Fig. 9 is a structural schematic diagram of the first limiting piece of another embodiment of the application;

[0043] FIG. 10 is a structural schematic view of a first insulating member according to another embodiment of the present application;

[0044] Reference signs: 1, battery; 10, housing; 100, accommodating cavity; 101, opening; 11, electrode assembly; 12, top cover sheet; 120, pole post hole; 121, first groove; 122, ring groove; 123, pressure relief valve; 124, pressure relief hole; 13, pole post; 130, second groove; 131, first column part; 132, second column part; 133, third column part; 14, first limiting member; 140, first limiting part; 141, second limiting part; 142, limiting groove; 143, third groove; 144, third limiting part; 15, first insulating member; 150, first protruding part; 151, second protruding part; 152, first insulating part; 153, second insulating part; 154, third protruding part; 16, sealing member; 160, first sealing part; 161, second sealing part; 17, second insulating member; 170, third insulating part; 171, fourth insulating part; X, first direction. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise specifically limited.

[0047] The pole of the battery is a key component for connecting the electrode assembly and external devices. In the battery manufacturing process, the pole is usually riveted to the top cover of the battery, and the conductive connection end is welded. In addition, the upper plastic is injected around the pole to form insulation and support the pole.

[0048] The battery is often in a vibrating state during application to electrical equipment such as a car. The pole needs to withstand the circumferential torsional force, which undoubtedly increases the risk of the pole and the top cover of the battery being separated. Therefore, the torsional resistance of the pole assembly structure directly affects the yield rate of the battery manufacturing and the safety in use.

[0049] Therefore, in combination with FIGS. 1-10, the embodiments of the present application provide a battery which aims to overcome at least one of the above technical problems.

[0050] In the following embodiments, a first direction X is introduced, which is parallel to the thickness direction of the top cover structure of the battery in the embodiments.

[0051] Referring to FIGS. 1-10, a battery 1 includes a shell 10, an electrode assembly 11, a top cover sheet 12, a pole 13, a first limiting piece 14, and a first insulating piece 15.

[0052] The shell 10 has a receiving cavity 100 and an opening 101, the opening 101 communicates with the receiving cavity 100, and the electrode assembly 11 is arranged in the receiving cavity 100. The top cover sheet 12 is arranged on the opening 101, and the top cover sheet 12 is provided with a pole hole 120, the pole hole 120 penetrates the top cover sheet 12 in the first direction X, and the pole 13 is partially arranged in the pole hole 120 and connected to the electrode assembly 11. The first limiting piece 14 is located on the side of the top cover sheet 12 facing the electrode assembly 11, the first limiting piece 14 includes a first limiting part 140 and a second limiting part 141, the second limiting part 141 surrounds the first limiting part 140, the second limiting part 141 is connected to the top cover sheet 12 and surrounds the pole 13, the first limiting part 140 and the top cover sheet 12 form a limiting groove 142 in the first direction X, and part of the pole 13 is embedded in the limiting groove 142. Part of the first insulating piece 15 is arranged in the pole hole 120 and surrounds the pole 13, and at least part of the first insulating piece 15 abuts between the top cover sheet 12 and the pole 13.

[0053] One of the top cover sheet 12 and the first insulating piece 15 is provided with a first protrusion 150, and the other is provided with a first groove 121 for embedding the first protrusion 150. One of the pole 13 and the first insulating piece 15 is provided with a second protrusion 150, and the other is provided with a second groove 130 for embedding the second protrusion 150.

[0054] It can be understood that the top cover sheet 12 and the first limiting member 14 clamp the pole 13 in the first direction X, thereby improving the limiting effect on the pole 13 and improving the torsional strength of the pole 13. On this basis, by embedding the first protrusion 150 in the first groove 121 and the second protrusion 151 in the second groove 130, a mutual limiting effect between the top cover sheet 12, the pole 13 and the first insulating member 15 is formed, further improving the torsional capacity of the pole 13.

[0055] It should be noted that in the present embodiment, referring to FIGS. 3-5, the first protrusion 150 and the second protrusion 151 are respectively arranged on the first insulating member 15, the first groove 121 is arranged on the top cover sheet 12, and the second groove 130 is arranged on the pole 13.

[0056] In other embodiments, the first protrusion 150 can also be arranged on the top cover sheet 12, the second protrusion 151 is arranged on the pole 13, and the first groove 121 and the second groove 130 are distributed on the first insulating member 15 for the first protrusion 150 and the second protrusion 151 to be embedded respectively.

[0057] In other embodiments, the first protrusion 150 can also be arranged on the top cover sheet 12, the second protrusion 151 is arranged on the first insulating member 15, the first groove 121 is arranged on the first insulating member 15, and the second groove 130 is arranged on the pole 13.

[0058] In other embodiments, the first protrusion 150 can also be arranged on the first insulating member 15, the second protrusion 151 is arranged on the pole 13, the first groove 121 is arranged on the top cover sheet 12, and the second groove 130 is arranged on the first insulating member 15.

[0059] It is intended that the top cover sheet 12, the pole 13 and the first insulating member 15 are mutually limited by the first protrusion 150, the second protrusion 151, the first groove 121 and the second groove 130, which will not be described here.

[0060] Specifically, referring to FIGS. 3-5, the pole 13 includes a first column portion 131, a second column portion 132 and a third column portion 133 arranged in the first direction X, the first column portion 131 is located on the side of the third column portion 133 away from the electrode assembly 11, and the second column portion 132 is at least partially located in the limiting groove 142. The first insulating member 15 includes a first insulating portion 152 surrounding the first column portion 131 and a second insulating portion 153 connected to the side of the first insulating portion 152 away from the first column portion 131, the first insulating portion 152 abuts against the first column portion 131 and the top cover sheet 12, and the first protrusion 150 is arranged on the first insulating portion 152. The second insulating portion 153 is at least partially arranged in the limiting groove 142, and the second insulating portion 153 abuts against the second column portion 132 and the top cover sheet 12.

[0061] It should be noted that the first column portion 131, the second column portion 132 and the third column portion 133 can be integrally formed of the same material, such as aluminum. In other embodiments, the first column portion 131, the second column portion 132 and the third column portion 133 can be made of different materials. For example, the first column portion 131 and the second column portion 132 can be made of aluminum, and the third column portion 133 can be made of copper to better conduct the electrode assembly 11.

[0062] In addition, it can be understood that, since the first limiting member 14 is arranged on the side of the top cover sheet 12 facing the electrode assembly 11, referring to FIG. 4, in the present embodiment, the side of the first column portion 131 away from the second column portion 132 can be flush with the side of the top cover sheet 12 away from the electrode assembly 11, which is beneficial to reduce the space occupation of the pole 13 in the first direction X of the battery 1, and is beneficial to improve the energy density of the battery 1.

[0063] In some embodiments, referring to FIGS. 4 to 6, the first protrusion 150 and the second protrusion 151 are arranged at one end of the first insulating portion 152 away from the second column portion 132.

[0064] It can be understood that the first protrusion 150 and the second protrusion 151 can be integrally formed with the first insulating member 15, that is, during the injection molding of the first insulating member 15, the portions injected into the first recess 121 and the second recess 130 naturally form the first protrusion 150 and the second protrusion 151.

[0065] Specifically, the formed second protrusion 151 extends in a direction of the first insulating portion 152 radially towards the first column portion 131, and the formed first protrusion 150 extends in a direction of the first insulating portion 152 radially away from the first column portion 131.

[0066] In the first direction X, the thickness of the formed second protrusion 151 is less than the thickness of the formed first protrusion 150. Since the first protrusion 150 has a larger area in contact with the top cover sheet 2, this design can further improve the structural strength of the top cover assembly, thereby further improving the torsional resistance of the pole 13.

[0067] In the present embodiment, the cross section of the first protrusion 150 and the second protrusion 151 is rectangular. According to requirements, the shapes of the first recess 121 and the second recess 130 can also be designed as other shapes, such as circular or other irregular shapes.

[0068] In order to further improve the torsional resistance of the pole 13, in some embodiments, a plurality of first protrusions 150 and a plurality of second protrusions 151 are respectively arranged, and each first protrusion 150 is embedded in a first groove 121, and each second protrusion 151 is embedded in a second groove 130. The plurality of first protrusions 150 and the plurality of second protrusions 151 correspond to the first grooves 121 and the second grooves 130 which are evenly distributed around the pole 13. In this embodiment, four first protrusions 150, four second protrusions 151, four first grooves 121 and four second grooves 130 are arranged as an example, and in other embodiments, the number of first protrusions 150, second protrusions 151, first grooves 121 and second grooves 130 can be flexibly increased or decreased according to actual needs.

[0069] In addition, it can be understood that in some embodiments, the arrangement position of the first protrusion 150 and the second protrusion 151 can also be adjusted along the first direction X, and the arrangement position of the first protrusion 150 and the second protrusion 151 can also be adjusted along the first direction X. The opening position of the first groove 121 and the second groove 130 can be adjusted, which will not be described here.

[0070] In some embodiments, referring to FIG. 4, the side of the top cover sheet 12 facing the electrode assembly 11 is provided with a ring groove 122 which surrounds the pole hole 120 and communicates with the pole hole 120. The first limiting piece 14 further comprises a third limiting portion 144 surrounding the pole 13, the third limiting portion 144 being connected to the side of the second limiting portion 141 away from the first limiting portion 140, and the third limiting portion 144 being embedded in the ring groove 122 and connected to the top cover sheet 12. By providing the pre-set ring groove 122 on the top cover sheet 12, the first limiting piece 14 can be quickly positioned and assembled, and the assembly stability of the first limiting piece 14 is improved. In practice, the first limiting piece 14 can be welded to the top cover sheet 12 by using the third limiting portion 144.

[0071] In some embodiments, referring to FIG. 4 and FIG. 5, in order to improve the sealing effect at the pole hole 120, the battery 1 further comprises a sealing piece 16 arranged in the limiting groove 142. The sealing piece 16 comprises a first sealing portion 160 and a second sealing portion 161 which are connected to each other, the first sealing portion 160 is arranged between the second column portion 132 and the second limiting portion 141, and the first sealing portion 160 abuts against the second column portion 132 and the second limiting portion 141, the second sealing portion 161 is arranged between the first limiting portion 140 and the second column portion 132, and the second sealing portion 161 abuts against the first limiting portion 140 and the second column portion 132.

[0072] In some embodiments, referring to FIG. 4, the battery 1 further comprises a second insulating member 17. The second insulating member 17 comprises a third insulating portion 170 and a fourth insulating portion 171 connected to each other, the third insulating portion 170 is arranged on the side of the top cover sheet 12 facing the electrode assembly 11, and the third insulating portion 170 covers the first limiting member 14, at least part of the fourth insulating portion 171 is arranged between the first limiting portion 140 and the third column portion 133, and the fourth insulating portion 171 surrounds the third column portion 133.

[0073] It can be understood that the third insulating portion 170 and the fourth insulating portion 171 can be integrally formed by injection molding, the third insulating portion 170 insulatingly separates the electrode assembly 11 and the top cover sheet 12, and at the same time, the fourth insulating portion 171 further insulatingly separates the pole column 13 and the first limiting member 14, thereby improving the insulating protection of the pole column 13, and at the same time, the fourth insulating portion 171 forms a fixing effect on the pole column 13, thereby improving the torsion resistance of the pole column 13.

[0074] In some embodiments, the fourth insulating portion 171 is located between the sealing member 16 and the first limiting member 14, and the fourth insulating portion 171 abuts against the sealing member 16, the first limiting member 14 and the third column portion 133.

[0075] The sealing member 16 cooperates with the fourth insulating portion 171 to surround the pole column, and forms multiple seals between the first limiting member 14 and the top cover sheet 12, thereby facilitating to improve the air tightness of the pole column installation position and the safety performance of the battery.

[0076] In addition, in order to further improve the torsion resistance of the pole column 13, in some embodiments, referring to FIGS. 7 to 10, the second insulating portion 153 is provided with a third protruding portion 154 on the side away from the first insulating portion 152, and correspondingly, the first limiting member 14 can be adaptively provided with a third recess 143 for embedding the third protruding portion 154. The third protruding portion 154 can also be integrally formed with the first insulating member 15 during the injection molding process, and through the cooperation of the third protruding portion 154 and the third recess 143, the limiting and fixing effect between the first limiting member 14 and the first insulating member 15 is further improved, thereby improving the fixing effect between the pole column 13 and the top cover sheet 12 and improving the torsion resistance of the pole column 13.

[0077] The longitudinal section of the third protruding portion 154 and the third recess 143 is rectangular, and the shape of the second protruding portion 153 and the third recess 143 can also be designed as other shapes, such as circular or other irregular shapes, according to requirements.

[0078] It can be understood that in some embodiments, the third protruding portion 154 can also be arranged on the first limiting member 14, and correspondingly, the third recess 143 is arranged on the second insulating portion 153, which will not be described here.

[0079] Correspondingly, the application provides a battery pack comprising the battery 1. The battery pack can be applied to electronic devices, power storage devices, or power vehicles, and the like. It can be understood that the battery pack can have all the technical features and corresponding beneficial effects of the battery 1, and details are not repeated here.

[0080] The above describes in detail the battery and the battery pack provided by the embodiments of the application, and the principles and implementation manners of the application are described by using specific examples. The above description of the embodiments is only used to help understand the technical solutions of the application and the core ideas thereof. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. The modifications or replacements do not change the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the application.

Claims

1. A battery (1), wherein The battery (1) has a first direction (X), and the battery (1) comprises: a housing (10) having a containing cavity (100) and an opening (101) communicating with the containing cavity (100); an electrode assembly (11) arranged in the containing cavity (100); a top cover sheet (12) arranged on the opening (101), the top cover sheet (12) being provided with a pole column hole (120) penetrating through the top cover sheet (12) in the first direction (X); a pole column (13) partially penetrating through the pole column hole (120) and connected with the electrode assembly (11); a first limiting member (14) located on a side of the top cover sheet (12) facing the electrode assembly (11), the first limiting member (14) comprising a first limiting part (140) and a second limiting part (141), the second limiting part (141) surrounding the first limiting part (140), the second limiting part (141) being connected with the top cover sheet (12) and surrounding the pole column (13), the first limiting part (140) and the top cover sheet (12) forming a limiting groove (142) in the first direction (X), and the pole column (13) being partially embedded in the limiting groove (142); a first insulating member (15) partially penetrating through the pole column hole (120) and surrounding the pole column (13), at least a part of the first insulating member (15) abutting between the top cover sheet (12) and the pole column (13); wherein one of the top cover sheet (12) and the first insulating member (15) is provided with a first protrusion (150), and the other is provided with a first groove (121) for embedding the first protrusion (150), and one of the pole column (13) and the first insulating member (15) is provided with a second protrusion (150), and the other is provided with a second groove (130) for embedding the second protrusion (150).

2. The battery (1) according to claim 1, wherein the first protrusion (150) and the second protrusion (151) are respectively arranged on the first insulating member (15), the first groove (121) is arranged on the top cover sheet (12), and the second groove (130) is arranged on the pole column (13).

3. The battery (1) according to claim 1, wherein the first protrusion (150), the second protrusion (151), the first groove (121) and the second groove (130) are respectively provided with a plurality of the first protrusions (150) and the second protrusions (151), and each of the first protrusions (150) is embedded in one of the first grooves (121), and each of the second protrusions (151) is embedded in one of the second grooves (130).

4. The battery (1) according to claim 3, wherein the plurality of the first protrusions (150) are distributed at intervals around the pole column (13). And / or, a plurality of the second protrusions (151) are spaced around the pole (13).

5. The battery (1) according to claim 2, wherein, The pole (13) comprises a first column portion (131), a second column portion (132) and a third column portion (133) arranged in a first direction (X), the first column portion (131) is located on a side of the third column portion (133) away from the electrode assembly (11), and the second column portion (132) is at least partially located in the limiting groove (142); The first insulating member (15) comprises a first insulating portion (152) surrounding the first column portion (131), the first insulating portion (152) abuts the first column portion (131) and the top cover sheet (12), and the first protrusion (150) and the second protrusion (151) are respectively arranged on the first insulating portion (152).

6. The battery (1) according to claim 5, wherein, The first insulating member (15) further comprises a second insulating portion (153) connected to a side of the first insulating portion (152) away from the first column portion (131), the second insulating portion (153) is at least partially arranged in the limiting groove (142), and the second insulating portion (153) abuts the second column portion (132) and the top cover sheet (12).

7. The battery (1) according to claim 1, wherein, The top cover sheet (12) is provided with a ring groove (122) on a side thereof facing the electrode assembly (11), the ring groove (122) surrounds the pole hole (120) and communicates with the pole hole (120); The first limiting member (14) further comprises a third limiting portion (144) surrounding the pole (13), the third limiting portion (144) is connected to a side of the second limiting portion (141) away from the first limiting portion (140), and the third limiting portion (144) is embedded in the ring groove (122) and connected to the top cover sheet (12).

8. The battery (1) according to claim 5, further comprising: A sealing member (16) arranged in the limiting groove (142), the sealing member (16) comprises a first sealing portion (160) and a second sealing portion (161) connected to each other, the first sealing portion (160) is arranged between the second column portion (132) and the second limiting portion (141), and the first sealing portion (160) abuts the second column portion (132) and the second limiting portion (141), the second sealing portion (161) is arranged between the first limiting portion (140) and the second column portion (132), and the second sealing portion (161) abuts the first limiting portion (140) and the second column portion (132).

9. The battery (1) according to claim 5, further comprising: A second insulating piece (17) includes a third insulating portion (170) and a fourth insulating portion (171) connected to each other, the third insulating portion (170) is arranged on a side of the top cover sheet (12) facing the electrode assembly (11), and the third insulating portion (170) covers the first limiting piece (14), at least part of the fourth insulating portion (171) is arranged between the first limiting portion (140) and the third column portion (133), and the fourth insulating portion (171) surrounds the third column portion (133).

10. The battery (1) according to any one of claims 1 to 9, wherein Part of the first insulating piece (15) is embedded in the limiting groove (142), one of the first insulating piece (15) and the first limiting piece (14) is provided with a third protrusion (153), and the other is provided with a third groove (143) for embedding the third protrusion (153).

11. The battery (1) according to claim 1, wherein The first protrusion (150) is arranged on the top cover sheet (12), the second protrusion (151) is arranged on the pole column (13), and the first groove (121) and the second groove (130) are arranged on the first insulating piece (15) for embedding the first protrusion (150) and the second protrusion (151) respectively.

12. The battery (1) according to claim 1, wherein The first protrusion (150) is arranged on the top cover sheet (12), the second protrusion (151) is arranged on the first insulating piece (15), the first groove (121) is arranged on the first insulating piece (15), and the second groove (130) is arranged on the pole column (13).

13. The battery (1) according to claim 1, wherein The first protrusion (150) is arranged on the first insulating piece (15), the second protrusion (151) is arranged on the pole column (13), the first groove (121) is arranged on the top cover sheet (12), and the second groove (130) is arranged on the first insulating piece (15).

14. A battery pack comprising the battery (1) according to any one of claims 1 to 13.

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