Pole assembly, top cover and battery

Abstract

The utility model provides a pole assembly, a top cover and a battery. The pole assembly comprises a first connecting part and a second connecting part, the first connecting part comprises a first bottom wall, a first side wall and a first clamping piece, the first side wall is arranged around the first bottom wall and forms a containing groove, the second connecting part is arranged in the containing groove, the first bottom wall and / or the first side wall are / is provided with the first clamping piece, and the first clamping piece is arranged in the containing groove. And the second connecting part is provided with a second clamping piece corresponding to the first clamping piece, and the second clamping piece is clamped to the first clamping piece, so that different metal structures in the pole are prevented from falling off and being separated, the connecting effect of the pole assembly is ensured, and the pole assembly can efficiently and stably complete current transmission.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an electrode assembly, a top cover, and a battery. Background Technology

[0002] The battery top cover terminal is a key part connecting the internal electrodes of the battery to the external circuit. In related technologies, due to different manufacturing processes or materials, the battery top cover terminal is usually connected by multiple parts. However, there may be insufficient bonding strength between different parts, which can cause the terminal parts to fall off and reduce the electrical connection effect of the terminal. Utility Model Content

[0003] Embodiments of this application provide a terminal assembly, a top cover, and a battery, which can improve the technical problem of terminal structures easily detaching.

[0004] In a first aspect, embodiments of this application provide a pole assembly, comprising:

[0005] The first connecting portion includes a first bottom wall, a first side wall, and a first snap-fit ​​member. The first bottom wall is used to connect an internal connector inside the battery. The first side wall is arranged around the first bottom wall and forms an accommodating groove. The first bottom wall and / or the first side wall are provided with a first snap-fit ​​member.

[0006] The second connecting part includes a top edge and a body connected to the top edge. The top edge is used to connect to an external connector outside the battery. The body is disposed in the receiving groove. The body is provided with a second connector corresponding to the first connector. The second connector is snapped into the first connector.

[0007] In some embodiments, the first sidewall and the first bottom wall form a receiving portion, the receiving portion being sleeved on the body, the body including a second bottom wall and a second sidewall disposed around the second bottom wall, the second sidewall being attached to the first sidewall, and the second bottom wall being attached to the first bottom wall.

[0008] In some embodiments, the first latching member is a protrusion, and the second latching member is a groove, with the protrusion correspondingly latching into the groove; or...

[0009] The first snap-fit ​​component is a groove, and the second snap-fit ​​component is a protrusion, with the protrusion corresponding to the groove.

[0010] In some embodiments, the first bottom wall is provided with the first snap-fit ​​member, and the second bottom wall is provided with the second snap-fit ​​member accordingly.

[0011] In some embodiments, the first latching member is the protrusion, and the second latching member is the groove;

[0012] The diameter of the bump gradually increases in the direction away from the first bottom wall.

[0013] In some embodiments, the bump includes a first bottom surface and a first side surface surrounding the first bottom surface, wherein the angle between the first side surface and the first bottom wall is α, and the angle is 0° < α < 90°.

[0014] In some embodiments, the diameter of the first snap-fit ​​member and / or the second snap-fit ​​member gradually increases along a direction away from the first bottom wall.

[0015] In some embodiments, the first sidewall is provided with the first snap-fit ​​member, and the second sidewall is provided with the second snap-fit ​​member accordingly.

[0016] In some embodiments, the first latching member is the protrusion, and the second latching member is the groove;

[0017] The diameter of the protrusion gradually decreases along the direction away from the first sidewall.

[0018] In some embodiments, the bump includes a first bottom surface and a first side surface surrounding the first bottom surface, wherein the angle between the first side surface and the first sidewall is β, and 0° < β ≤ 90°.

[0019] In some embodiments, the first bottom wall is provided with at least one first snap-fit ​​element, and the first side wall is provided with at least one first snap-fit ​​element.

[0020] The main body is provided with at least one second snap-fit ​​member corresponding to the first bottom wall, and the main body is provided with at least one second snap-fit ​​member corresponding to the first side wall.

[0021] Secondly, this application provides a top cover, including the pole assembly as described above.

[0022] Thirdly, embodiments of this application provide a battery including the top cover as described above.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] In the embodiments of this application, a terminal assembly, a top cover, and a battery are provided. The terminal assembly includes a first connecting portion and a second connecting portion. The first connecting portion includes a first bottom wall, a first side wall, and a first snap-fit ​​member. The first side wall surrounds the first bottom wall and forms a receiving groove. The second connecting portion is disposed in the receiving groove. The first bottom wall and / or the first side wall are provided with the first snap-fit ​​member. The body of the second connecting portion is provided with a second snap-fit ​​member corresponding to the first snap-fit ​​member. The second snap-fit ​​member snaps into the first snap-fit ​​member. Compared with the prior art, the terminal assembly of this application can increase the bonding strength between different parts through the snap-fit ​​of the first snap-fit ​​member and the second snap-fit ​​member, improve the stability of the terminal assembly, avoid the detachment and separation of different parts in the terminal, ensure the electrical connection effect of the terminal assembly, and enable the terminal assembly to complete current transmission efficiently and stably. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the pole assembly provided in an embodiment of this application;

[0027] Figure 2 Yes, yes Figure 1 Exploded view of the pole assembly shown;

[0028] Figure 3 yes Figure 1 Side view of the pole assembly shown;

[0029] Figure 4 yes Figure 3 The pole assembly shown is a cross-sectional view along AA;

[0030] Figure 5 yes Figure 4 A magnified schematic diagram of part A of the pole assembly shown;

[0031] Figure 6 yes Figure 1 The front view of the pole assembly shown;

[0032] Figure 7 yes Figure 6 The pole assembly shown is a cross-sectional view along BB;

[0033] Figure 8 This is a schematic diagram of the structure of the cover plate assembly provided in the embodiments of this application;

[0034] Figure 9 yes Figure 8Top view of the cover plate assembly shown;

[0035] Figure 10 yes Figure 9 The cover plate assembly shown is a cross-sectional view along CC.

[0036] Figure label:

[0037] 100. Pole post assembly;

[0038] 10. First connecting part; 101. Receiving part; 102. Ring edge; 103. Receiving groove; 1011. First side wall; 1012. First bottom wall; 11. First snap-fit ​​component;

[0039] 20. Second connecting part; 201. Body; 2011. Second side wall; 2012. Second bottom wall; 2013. Top edge; 21. Second snap-fit ​​component;

[0040] 200, top cover; 2001, cover plate; 2002, pin. 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 the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0042] The battery top cover terminal is a key part connecting the internal electrodes of the battery to the external circuit. In related technologies, due to different manufacturing processes or materials, the battery top cover terminal is usually connected by multiple parts. However, there may be insufficient bonding strength between different parts, which can cause the terminal parts to fall off and reduce the terminal connection effect.

[0043] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of the structure of the pole assembly provided in an embodiment of this application. Figure 2 Yes, yes Figure 1The exploded view shown is of the terminal assembly. This application provides a terminal assembly 100, which includes a first connecting portion 10 and a second connecting portion 20. The first connecting portion 10 includes a first bottom wall 1012, a first side wall 1011, and a first snap-fit ​​member 11. The first side wall 1011 surrounds the first bottom wall 1012 and forms a receiving groove 103. The second connecting portion 20 includes a top edge 2013 and a body 201 connected to the top edge 2013. The top edge 2013 is used to connect to an external connector of the battery. The body 201 is disposed within the receiving groove 103. The first bottom wall 1012... And / or the first sidewall 1011 is provided with a first snap-fit ​​member 11, and the body 201 is provided with a second snap-fit ​​member 21 corresponding to the first snap-fit ​​member 11. The second snap-fit ​​member 21 is snapped into the first snap-fit ​​member 11. The pole assembly 100 of this application can increase the bonding strength between different parts through the snap-fit ​​of the first snap-fit ​​member 11 and the second snap-fit ​​member 21, improve the stability of the pole assembly 100, avoid the detachment and separation of different structures in the pole, ensure the electrical connection effect of the pole assembly 100, and enable the pole assembly 100 to complete the current transmission efficiently and stably.

[0044] The first connecting part 10 is electrically connected to an internal connector located inside the battery. The internal connector is connected to the battery cell inside the battery. The material of the internal connector is the same as that of the first connecting part 10. The internal connector can be connected to the first bottom wall 1012 by welding. The second connecting part 20 is used to connect to an external connector outside the battery. The external connector and the second connecting part 20 are made of the same material. The external connector can be connected to the top edge 2013 by welding. The electrical energy inside the battery can be conducted to the external circuit or load through the terminal assembly 100, realizing the conduction of current.

[0045] In some embodiments, the first connecting portion 10 and the second connecting portion 20 are made of different metals, such that the first connecting portion 10 and the second connecting portion 20 in the pole assembly 100 form a composite pole.

[0046] In related technologies, battery top cover terminals are often made by upsetting a composite plate of two metals, i.e., cold upsetting to form a composite terminal. However, there may be insufficient bonding strength between the two metals, which can cause the metals inside the terminal to detach, resulting in insufficient tensile strength, or even breakage of the terminal inside.

[0047] Composite terminals are a type of terminal used in battery manufacturing, composed of a combination of multiple materials. These composite terminal units are typically used in batteries requiring high performance. Composite terminals are usually made by combining different metal materials, alloys, coatings, or other functional materials. Composite terminals can optimize battery conductivity, mechanical strength, corrosion resistance, and cost while ensuring battery performance. In this application, the first connecting portion 10 and the second connecting portion 20 are made of different metals to increase the conductivity and mechanical strength of the terminal assembly 100. The first connecting portion 10 and the second connecting portion 20 can be copper-nickel composite materials, aluminum-nickel composite materials, nickel-copper composite materials, copper-aluminum composite materials, etc.

[0048] In some examples, the first bottom wall 1012 or the first side wall 1011 is provided with a first snap-fit ​​11, and the second bottom wall 2012 or the second side wall 2011 is provided with a second snap-fit ​​21 corresponding to the first snap-fit ​​11.

[0049] In some examples, the first bottom wall 1012 and the first side wall 1011 are provided with a first snap-fit ​​member 11, and the second bottom wall 2012 and the second side wall 2011 are respectively provided with a second snap-fit ​​member 21.

[0050] In some examples, the first connecting portion 10 and the second connecting portion 20 are tightly connected using a pressing process. This pressing process can press the electrode post into the desired shape with high precision and efficiency, increasing material density, improving battery performance, and increasing battery capacity. It also improves the conductivity of the electrode post, ensuring the mechanical stability of the battery.

[0051] In some embodiments, the first sidewall 1011 and the first bottom wall 1012 form a receiving portion 101, the receiving portion 101 being sleeved on the body 201, the body 201 including a second bottom wall 2012 and a second sidewall 2011 disposed around the second bottom wall 2012, the second sidewall 2011 being attached to the first sidewall 1011, and the second bottom wall 2012 being attached to the first bottom wall 1012.

[0052] Specifically, the first connecting portion 10 includes a receiving portion 101 and an annular edge 102 surrounding the receiving portion 101. The first side wall 1011 and the first bottom wall 1012 form the receiving portion 101. The annular edge 102 is connected to the first side wall 1011. The top edge 2013 of the second connecting portion 20 is connected to the second side wall 2011. An annular groove is provided in the top edge 2013, and the annular edge 102 is engaged in the annular groove.

[0053] In common composite electrode structures, the outer metal layer is planar, and the planar surface is prone to detachment when the battery heats up. However, in this application, the first connecting portion 10 is sleeved on the second connecting portion 20 to form a covering state, which increases the contact area between the second connecting portion 20 and the first connecting portion 10 and reduces the probability of the first connecting portion 10 melting and detaching under heated conditions.

[0054] In some embodiments, the first latching member 11 is a protrusion and the second latching member 21 is a groove, with the protrusion correspondingly latching into the groove; or the first latching member 11 is a groove and the second latching member 21 is a protrusion, with the protrusion correspondingly latching into the groove.

[0055] In some examples, the first bottom wall 1012 is provided with a protrusion, the second bottom wall 2012 is provided with a corresponding groove, and the first side wall 1011 and the second side wall 2011 are not provided with a snap-fit ​​structure; or the first bottom wall 1012 is provided with a groove, the second bottom wall 2012 is provided with a corresponding protrusion, and the first side wall 1011 and the second side wall 2011 are not provided with a snap-fit ​​structure.

[0056] In some examples, the first sidewall 1011 has a protrusion, and the second sidewall 2011 has a corresponding groove. The first bottom wall 1012 and the second bottom wall 2012 do not have a snap-fit ​​structure; or the first sidewall 1011 has a groove, the second sidewall 2011 has a corresponding protrusion, and the first bottom wall 1012 and the second bottom wall 2012 do not have a snap-fit ​​structure.

[0057] In some examples, the first bottom wall 1012 is provided with a protrusion, the second bottom wall 2012 is provided with a corresponding groove, and the first side wall 1011 is provided with a protrusion, and the second side wall 2011 is provided with a corresponding groove.

[0058] Alternatively, the first bottom wall 1012 may be provided with a protrusion, the second bottom wall 2012 may be provided with a corresponding groove, and the first side wall 1011 may be provided with a groove, and the second side wall 2011 may be provided with a corresponding protrusion.

[0059] In some examples, the first bottom wall 1012 is provided with a groove, the second bottom wall 2012 is provided with a corresponding protrusion, and the first side wall 1011 is provided with a protrusion, and the second side wall 2011 is provided with a corresponding groove.

[0060] Alternatively, the first bottom wall 1012 may be provided with a groove, the second bottom wall 2012 may be provided with a corresponding protrusion, and the first side wall 1011 may be provided with a groove, the second side wall 2011 may be provided with a corresponding protrusion.

[0061] Please refer to Figures 3-5 , Figure 3 yes Figure 1 The side view of the pole assembly shown. Figure 4 yes Figure 3 The diagram shows a cross-sectional view of the pole assembly along AA. Figure 5 yes Figure 4A magnified schematic diagram of part A of the pole assembly shown.

[0062] In some embodiments, the first bottom wall 1012 is provided with the first snap-fit ​​member 11, and the second bottom wall 2012 is provided with the second snap-fit ​​member 21.

[0063] In some examples, the first snap-fit ​​11 is a protrusion and the second snap-fit ​​21 is a groove. The first snap-fit ​​11 protrudes upward. At the material junction of the first connecting part 10 and the second connecting part 20, the protrusion of the first connecting part 10 extends into the groove of the second connecting part 20 to form a first snap-fit ​​structure. When the pole assembly 100 is subjected to left and right radial tension, the first snap-fit ​​structure will hinder the axial relative sliding between the first material of the first connecting part 10 and the second material of the second connecting part 20, thereby increasing the strength of the joint surface.

[0064] In some examples, the first snap-fit ​​member 11 is a groove, and the second snap-fit ​​member 21 is a protrusion. The first snap-fit ​​member 11 is recessed downwards, and the second snap-fit ​​member 21 extends into the groove of the second snap-fit ​​member 21. The protrusion of the second connecting part 20 extends into the groove of the first connecting part 10, forming a second snap-fit ​​structure. When the pole assembly 100 is subjected to radial tension, the second snap-fit ​​structure will hinder the axial relative sliding between the first material of the first connecting part 10 and the second material of the second connecting part 20, thereby increasing the strength of the mating surface.

[0065] In some embodiments, the first snap-fit ​​member 11 is the protrusion, the second snap-fit ​​member 21 is the groove, and the diameter of the protrusion gradually increases along the direction away from the first bottom wall 1012.

[0066] Specifically, the protrusion has barbs at both ends. When the protrusion is subjected to axial vertical tension, the two materials will be stuck together by the barbs and cannot be detached. The barb structure can be formed by two pressing operations. In the first pressing operation, a small-area punch is used to form the protrusion into a cylindrical structure. Then, a large-area punch is used to press a small depth to increase the diameter of the protrusion away from the first bottom wall 1012, so as to form the barb structure.

[0067] In some embodiments, the protrusion includes a first bottom surface and a first side surface surrounding the first bottom surface, wherein the angle between the first side surface and the first bottom wall 1012 is 0° < α < 90°, and can be 30°, 40°, 45°, 50°, 60°, 75°, 80°, etc., which are not limited herein.

[0068] In some embodiments, the diameter of the groove can gradually increase in a direction away from the first bottom wall 1012 to match the protrusion. The groove includes a second bottom surface and a second side surface surrounding the second bottom surface. The first bottom surface is attached to the second bottom surface, and the first side surface is attached to the second side surface. The second side surface and the first bottom wall 1012 form an angle, which can be 30°, 40°, 45°, 50°, 60°, 75°, 80°, etc., and is not limited herein.

[0069] Please refer to Figures 6-7 , Figure 6 yes Figure 1 The front view of the pole assembly shown. Figure 7 yes Figure 6 The pole assembly shown is a cross-sectional view along BB.

[0070] In some embodiments, the first sidewall 1011 is provided with the first snap-fit ​​member 11, and the second sidewall 2011 is provided with the second snap-fit ​​member 21.

[0071] In some examples, the first snap-fit ​​11 is a protrusion and the second snap-fit ​​21 is a groove. At the material junction of the first connecting part 10 and the second connecting part 20, the protrusion of the first connecting part 10 extends into the groove of the second connecting part 20 to form a third snap-fit ​​structure. When the pole is subjected to axial up-and-down tension, the third snap-fit ​​structure will hinder the relative sliding between the first material of the first connecting part 10 and the second material of the second connecting part 20, thereby increasing the strength of the joint surface.

[0072] In some examples, the first snap-fit ​​11 is a groove, the second snap-fit ​​21 is a protrusion, and the protrusion of the second connecting part 20 extends into the groove of the first connecting part 10 to form a fourth snap-fit ​​structure. When the pole is subjected to an axial up-and-down pulling force, the fourth snap-fit ​​structure will hinder the relative sliding between the first material of the first connecting part 10 and the second material of the second connecting part 20, thereby increasing the strength of the mating surface.

[0073] In some embodiments, the first snap-fit ​​member 11 is the protrusion, the second snap-fit ​​member 21 is the groove, and the diameter of the protrusion gradually decreases along the direction away from the first sidewall 1011. The protrusion as a whole forms a trapezoidal structure, which facilitates drafting during the manufacturing process.

[0074] In some embodiments, the bump includes a first bottom surface and a first side surface surrounding the first bottom surface, wherein the angle between the first side surface and the first sidewall 1011 is 0° < β ≤ 90°, and can be 30°, 40°, 45°, 50°, 60°, 75°, 90°, etc., which are not limited herein.

[0075] In some embodiments, the diameter of the groove can gradually increase in a direction away from the first sidewall 1011 to match the protrusion. The groove includes a second bottom surface and a second side surface surrounding the second bottom surface. The first bottom surface is attached to the second bottom surface, and the first side surface is attached to the second side surface. The second side surface and the first sidewall 1011 form an angle, which can be 30°, 40°, 45°, 50°, 60°, 75°, 90°, etc., and is not limited herein.

[0076] In some embodiments, the first card connector 11 and the second card connector 21 may be circular, polygonal, elliptical, etc., and this application does not limit the shape of the first card connector 11 and the second card connector 21.

[0077] Understandably, the volume and shape of the first snap-fit ​​component 11 and the second snap-fit ​​component 21 can be the same or different. Since the protrusion will undergo a certain elastic deformation during the snap-fit ​​process, the structure of the groove can be smaller or equal to the protrusion, or a certain tolerance allowance is required when the protrusion and the groove are matched, and the groove can be slightly larger than the protrusion.

[0078] In some embodiments, the first bottom wall 1012 is provided with at least one first snap-fit ​​member 11, the first side wall 1011 is provided with at least one first snap-fit ​​member 11, the body 201 is provided with at least one second snap-fit ​​member 21 corresponding to the first bottom wall 1012, and the body 201 is provided with at least one second snap-fit ​​member 21 corresponding to the first side wall 1011.

[0079] Specifically, the second bottom wall 2012 is provided with at least one second snap-fit ​​member 21 corresponding to the first bottom wall 1012, and the second side wall 2011 is provided with at least one second snap-fit ​​member 21 corresponding to the first side wall 1011.

[0080] In some examples, not only is the first bottom wall 1012 provided with multiple first snap-fit ​​pieces 11, but the first side wall 1011 may also be provided with multiple first snap-fit ​​pieces 11. The pole post assembly 100 can limit different metal structures not only at the bottom but also on the side. That is, it can limit movement not only radially (left-right) but also axially (up-down).

[0081] In some examples, the first bottom wall 1012 is provided with a first card connector 11, and the second bottom wall 2012 is provided with a corresponding second card connector 21; the first side wall 1011 is provided with multiple first card connectors 11, and the second side wall 2011 is provided with multiple second card connectors 21. The number of first card connectors 11 on the first side wall 1011 and second card connectors 21 on the second side wall 2011 can be two, three, four, etc., and this application does not limit this.

[0082] In some examples, the first bottom wall 1012 is provided with a plurality of first card connectors 11, and the second bottom wall 2012 is provided with a plurality of second card connectors 21; the first side wall 1011 is provided with a first card connector 11, and the second side wall 2011 is provided with a corresponding second card connector 21. The number of first card connectors 11 of the first bottom wall 1012 and the number of second card connectors 21 of the second bottom wall 2012 can be two, three, four, etc., and this application does not limit this.

[0083] Please refer to Figures 8-10 , Figure 8 This is a schematic diagram of the structure of the cover plate assembly provided in the embodiments of this application. Figure 9 yes Figure 8 Top view of the cover plate assembly shown. Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the cover assembly along the CC direction. This application also provides a top cover 200, which includes the terminal assembly 100 as described above. Specifically, the top cover 200 includes a cover plate 2001, an upper plastic layer, a lower plastic layer, and other structures. The lower plastic layer is disposed on the side facing away from the cover plate 2001 and has an opening. A first connecting portion 10 is disposed within the opening, and a sealing ring is provided between the first connecting portion 10 and the top cover plate 2001 to prevent electrolyte, gas, or other chemical substances inside the battery from leaking to the outside. The top cover 200 also includes a pin 2002, which is connected to the terminal assembly 100 for transmitting current to the inside of the battery.

[0084] This application also provides a battery, which includes a top cover 200 as described above. The top cover 200 is located on top of the battery and is used to enclose the internal structure of the battery and provide an interface for the battery. It not only protects the internal components of the battery, but also performs many other important functions, such as electrical connection, pressure release, thermal management, and safety protection. The battery can be a lithium-ion battery, sodium-ion battery, nickel-metal hydride battery, lead-acid battery, polymer battery, etc., and its shape can be rectangular, cylindrical, square, etc., which are not limited herein.

[0085] The embodiments of this application have been described in detail above. Specific examples have been used 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 method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A pole assembly, characterized by Comprising: a first connecting part, comprising a first bottom wall, a first side wall and a first clamping member, the first bottom wall being used to connect an inner connecting member inside the battery, the first side wall being arranged around the first bottom wall and forming a receiving groove, the first bottom wall and / or the first side wall being provided with a first clamping member; a second connecting part, comprising a top edge and a body connected to the top edge, the top edge being used to connect an outer connecting member outside the battery, the body being arranged in the receiving groove, the body being provided with a second clamping member corresponding to the first clamping member, the second clamping member being clamped to the first clamping member.

2. The pole assembly of claim 1, wherein, The first side wall and the first bottom wall form a receiving part, the receiving part being sleeved on the body, the body comprising a second bottom wall and a second side wall arranged around the second bottom wall, the second side wall being attached to the first side wall, the second bottom wall being attached to the first bottom wall.

3. The pole assembly of claim 2, wherein, The first clamping member is a protrusion, and the second clamping member is a groove, the protrusion being clamped to the groove correspondingly; or, The first clamping member is a groove, and the second clamping member is a protrusion, the protrusion being clamped to the groove correspondingly.

4. The pole assembly of claim 3, wherein, The first bottom wall is provided with the first clamping member, and the second bottom wall is provided with the second clamping member correspondingly.

5. The pole assembly of claim 4, wherein, The first clamping member is the protrusion, and the second clamping member is the groove; In a direction away from the first bottom wall, the diameter of the protrusion gradually increases.

6. The pole assembly of claim 5, wherein, The protrusion comprises a first bottom surface and a first side surface arranged around the first bottom surface, an included angle between the first side surface and the first bottom wall being α, 0°<α<90°.

7. The pole assembly of claim 3, wherein, The first side wall is provided with the first clamping member, and the second side wall is provided with the second clamping member correspondingly.

8. The pole assembly of claim 7, wherein, The first clamping member is the protrusion, and the second clamping member is the groove; In a direction away from the first side wall, the diameter of the protrusion gradually decreases.

9. The pole assembly of claim 8, wherein, The protrusion comprises a first bottom surface and a first side surface arranged around the first bottom surface, an included angle between the first side surface and the first side wall being β, 0°<β≤90°.

10. The pole assembly according to any one of claims 1-9, wherein: The first bottom wall is provided with at least one first clamping member, and the first side wall is provided with at least one first clamping member; The body is provided with at least one second clamping member corresponding to the first bottom wall, and the body is provided with at least one second clamping member corresponding to the first side wall.

11. The pole assembly of any of claims 1-9, wherein, The first connecting part and the second connecting part are made of different metals.

12. A cap, characterized by Comprising the pole assembly according to any one of claims 1-11.

13. A battery, characterized by Comprising the top cover according to claim 12.

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