Battery

Abstract

The battery comprises a shell, a cover plate assembly, a pole group, a connecting piece and a pole column, the cover plate assembly is arranged at an opening of the shell, the pole group is arranged in the shell, the connecting piece is arranged in the shell and comprises a first connecting part and a second connecting part, pole lugs of the pole group are welded to the side, facing the cover plate assembly, of the first connecting part in a stacked mode, and the pole column is arranged on the side, facing the cover plate assembly, of the second connecting part. A plugging hole is formed in the second connecting part, and a plugging part matched with the plugging hole in a plugging manner is formed on the pole and is in welded connection with the second connecting part. According to the battery disclosed by the utility model, the tabs are laminated and welded on one side, facing the cover plate assembly, of the first connecting part, so that the connecting difficulty of the connecting sheets and the tabs can be reduced, and the welding quality of the connecting sheets and the tabs can be ensured. Besides, the plugging part is limited by the plugging hole, so that the mounting position of the pole on the connecting sheet can be accurately positioned, and the pole is prevented from generating position deviation relative to the connecting sheet, thereby improving the connecting position precision and the connecting strength of the connecting sheet and the pole.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery. Background Art

[0002] With the continuous and rapid development of the battery industry, due to its high environmental protection and low usage cost, it is widely used in industries such as electronic devices and vehicles. Among them, during the assembly process of the battery, it is usually necessary to connect the pole column and the tab through a connecting piece. However, in the related art, the tab is usually welded to the bottom of the connecting piece, resulting in insufficient welding space and difficult welding. Moreover, the connecting piece and the pole column cannot be accurately positioned, directly affecting the assembly efficiency and accuracy of the battery. Therefore, improvement is needed. Summary of the Utility Model

[0003] The utility model provides a battery, which has the advantages of high assembly efficiency and accuracy.

[0004] The battery according to an embodiment of the utility model includes: a housing and a cover assembly disposed at an opening of the housing; a pole group disposed within the housing; a connecting piece disposed within the housing and including a first connecting portion and a second connecting portion, the tabs of the pole group are stacked and welded to a side of the first connecting portion facing the cover assembly, and a plug hole is formed in the second connecting portion; a pole column having a plug portion that is plugged and matched with the plug hole and is welded to the second connecting portion.

[0005] In the battery according to an embodiment of the utility model, the tabs are stacked and welded to a side of the first connecting portion facing the cover assembly, which can reduce the connection difficulty between the connecting piece and the tabs and ensure the welding quality of the connecting piece and the tabs. In addition, through the limitation of the plug hole on the plug portion, precise positioning of the installation position of the pole column on the connecting piece can be achieved, and the pole column can be prevented from shifting relative to the connecting piece, thereby improving the connection position accuracy and connection strength between the connecting piece and the pole column.

[0006] According to some embodiments of the utility model, the first connecting portion and the second connecting portion are arranged in a first direction, and the first direction is perpendicular to the thickness direction of the cover assembly.

[0007] According to some embodiments of the utility model, there are a plurality of tabs and they are distributed on opposite sides of the first connecting portion in a second direction. The first connecting portion includes a first welding portion and a second welding portion arranged in the second direction. The first welding portion and the second welding portion are respectively used to connect the tabs located on opposite sides of the first connecting portion in the second direction. At least a part of the first welding portion and the second welding portion are spaced apart in the second direction, and the second direction is perpendicular to the thickness direction of the cover assembly.

[0008] According to some embodiments of the present utility model, the distance between the second connecting portion and the cover plate assembly is greater than the distance between the first connecting portion and the cover plate assembly.

[0009] According to some embodiments of the present utility model, the pole column includes a base and a connecting protrusion provided on a side surface of the base facing the cover plate assembly. The connecting protrusion penetrates through the cover plate assembly, the plugging portion is provided on a side surface of the base facing away from the cover plate assembly, and the side surface of the base facing the cover plate assembly is not higher than the side surface of the first connecting portion facing the cover plate assembly.

[0010] According to some embodiments of the present utility model, the cover plate assembly includes: a cover plate body, which is formed with an assembly hole penetrating in the thickness direction; a connecting block, the connecting block is provided in the assembly hole and is formed with an installation hole penetrating in the thickness direction of the cover plate assembly. The pole column includes a base and a connecting protrusion. The base is located on a side of the connecting block facing the electrode group, and the connecting protrusion is provided on a side of the base facing the connecting block. The connecting protrusion penetrates through the installation hole and is connected to the inner peripheral surface of the installation hole.

[0011] According to some embodiments of the present utility model, the installation hole includes a first hole section and a second hole section that are communicated. The connecting protrusion is at least connected to the inner peripheral surface of the first hole section. The second hole section is located on a side of the first hole section facing the electrode group. In a direction from the cover plate assembly towards the electrode group, the inner peripheral surface of the second hole section extends obliquely in a direction away from the central axis of the installation hole.

[0012] According to some embodiments of the present utility model, a welding space for accommodating a weld seam is defined between the outer peripheral surface of an end of the connecting protrusion away from the base and the inner peripheral surface of the installation hole.

[0013] According to some embodiments of the present utility model, an end of the connecting protrusion away from the base is formed as a guiding portion. In a direction from the electrode group towards the cover plate assembly, the outer peripheral surface of the guiding portion extends obliquely in a direction close to the central axis of the installation hole. The outer peripheral surface of the guiding portion and the inner peripheral surface of the installation hole jointly define the welding space.

[0014] According to some embodiments of the present utility model, in the axial direction of the installation hole, an end face on a side of the connecting protrusion away from the base is located in the installation hole and is spaced apart from an end face on a side of the connecting block away from the base.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0016] Figure 1 is a schematic diagram of a battery according to an embodiment of the present utility model;

[0017] Figure 2 is Figure 1 a top view of;

[0018] Figure 3 is Figure 2 a sectional view taken along A-A in;

[0019] Figure 4 is Figure 4 an enlarged view of region B in;

[0020] Figure 5 is a schematic diagram of a pole group, a connecting piece and a pole column of a battery according to an embodiment of the present utility model;

[0021] Figure 6 is Figure 5 a top view of;

[0022] Figure 7 is Figure 6 a sectional view taken along C-C in;

[0023] Figure 8 is a schematic diagram of a cover plate assembly of a battery according to an embodiment of the present utility model;

[0024] Figure 9 is Figure 8 a top view of;

[0025] Figure 10 is Figure 9 a sectional view taken along D-D in;

[0026] Figure 11 is a schematic diagram of a pole column and a connecting piece of a battery according to an embodiment of the present utility model;

[0027] Figure 12 is Figure 11 a bottom view of;

[0028] Figure 13 is Figure 12 a sectional view taken along E-E in.

[0029] Reference numerals:

[0030] Battery 100;

[0031] Housing 11; Cover plate assembly 12; Cover plate body 121; Connecting block 122; Mounting hole 123; First hole section 1231; Second hole section 1232; Welding space 1233;

[0032] Pole group 2; Pole ear 21;

[0033] Connecting piece 3; First connecting part 31; First welding part 311; Second welding part 312; Second connecting part 32; Insertion hole 321;

[0034] Terminal post 4; Insertion part 41; Base 42; Connecting protrusion 43; Guide part 431;

[0035] First direction e1; Second direction e2. Specific embodiments

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0037] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the applicability of other processes and / or the use of other materials.

[0038] The battery 100 according to an embodiment of the present invention will be described below with reference to the drawings.

[0039] As Figures 1 to 13 shown, the battery 100 according to an embodiment of the present invention includes: a housing 11, a cover assembly 12, an electrode group 2, a connecting piece 3, and a terminal post 4. The cover assembly 12 is disposed at the opening of the housing 11. The electrode group 2 is disposed in the housing 1. The connecting piece 3 is disposed in the housing 1 and includes a first connecting part 31 and a second connecting part 32. The electrode tabs 21 of the electrode group 2 are stacked and welded to one side of the first connecting part 31 facing the cover assembly 12. An insertion hole 321 is formed in the second connecting part 32. The terminal post 4 is formed with an insertion part 41 that is inserted and matched with the insertion hole 321 and is welded to the second connecting part 32.

[0040] That is to say, at least a part of the tab 21 is located on the side of the first connecting portion 31 facing the cover plate assembly 12 and is welded to the first connecting portion 31. That is, the connection position of the tab 21 and the connecting piece 3 is located on the side of the connecting piece 3 facing the cover plate assembly 12. Therefore, during the connection process of the connecting piece 3 and the electrode group 2, a larger operating space can be provided for the connection between the connecting piece 3 and the tab 21, thereby reducing the connection difficulty between the connecting piece 3 and the tab 21, and the welding condition between the tab 21 and the connecting piece 3 can be observed more clearly to ensure the welding quality of the connecting piece 3 and the tab 21. At the same time, the tab 21 can be L-shaped folded, which can save space and reduce the bending difficulty. In addition, the pole column 4 is inserted and connected to the second connecting portion 32 through the cooperation of the inserting portion 41 and the inserting hole 321. Through the limitation of the inserting hole 321 on the inserting portion 41, the accurate positioning of the installation position of the pole column 4 on the connecting piece 3 can be realized, and the pole column 4 can be prevented from generating a position offset relative to the connecting piece 3, thereby improving the connection position accuracy and connection strength between the connecting piece 3 and the pole column 4.

[0041] According to the battery 100 of the embodiment of the present invention, the tab 21 is stacked and welded on the side of the first connecting portion 31 facing the cover plate assembly 12, which can reduce the connection difficulty between the connecting piece 3 and the tab 21 and ensure the welding quality of the connecting piece 3 and the tab 21. In addition, through the limitation of the inserting hole 321 on the inserting portion 41, the accurate positioning of the installation position of the pole column 4 on the connecting piece 3 can be realized, and the pole column 4 can be prevented from generating a position offset relative to the connecting piece 3, thereby improving the connection position accuracy and connection strength between the connecting piece 3 and the pole column 4.

[0042] According to some embodiments of the present invention, the first connecting portion 31 and the second connecting portion 32 are arranged along the first direction e1, and the first direction e1 is perpendicular to the thickness direction of the cover plate assembly 12. Among them, the connecting piece 3 is connected to the tab 21 through the first connecting portion 31, and the connecting piece 3 is connected to the pole column 4 through the second connecting portion 32. That is to say, the connection positions of the connecting piece 3 and the tab 21 and the connection positions of the connecting piece 3 and the pole column 4 are arranged along the first direction e1. Thus, the interval between the connection position of the connecting piece 3 and the tab 21 and the connection position of the connecting piece 3 and the pole column 4 can be preferably increased, thereby avoiding the adverse effect on the connection position of the connecting piece 3 and the pole column 4 during the welding process of the connecting piece 3 and the tab 21, or avoiding the adverse effect on the connection position of the connecting piece 3 and the tab 21 during the welding process of the connecting piece 3 and the pole column 4, thereby ensuring the stability of the connection between the connecting piece 3 and the tab 21 and the pole column 4.

[0043] According to some embodiments of the present utility model, there are multiple tab ears 21, which are distributed on opposite sides of the first connection part 31 in the second direction e2. The first connection part 31 includes a first welding part 311 and a second welding part 312 arranged along the second direction e2. The first welding part 311 and the second welding part 312 are respectively used to connect with the tab ears 21 located on opposite sides of the first connection part 31 in the second direction e2. At least part of the first welding part 311 and the second welding part 312 are spaced apart along the second direction e2, and the second direction e2 is perpendicular to the thickness direction of the cover plate assembly 12. That is to say, the tab ear 21 located on one side of the first connection part 31 in the second direction e2 is welded to the first welding part 311, and the tab ear 21 located on the other side of the first connection part 31 in the second direction e2 is welded to the second welding part 312. Therefore, by spacing apart at least part of the first welding part 311 and the second welding part 312 along the second direction e2, the influence of the welding process on the first welding part 311 and the second welding part 312 on each other can be better reduced. Specifically, it can avoid the adverse effect on the welding between the second welding part 312 and the tab ear 21 when the tab ear 21 is welded to the first welding part 311, and at the same time, it can avoid the adverse effect on the welding between the first welding part 311 and the tab ear 21 when the tab ear 21 is welded to the second welding part 312, so as to ensure the connection stability between the tab ears 21 located on opposite sides of the first connection part 31 in the second direction e2 and the first welding part 311 and the second welding part 312 respectively.

[0044] In a specific example, the first connection part 31 and the second connection part 32 are arranged along the first direction e1. The first welding part 311 and the second welding part 312 are arranged along the second direction e2. The first direction e1 is perpendicular to the second direction e2. One end of the first welding part 311 and the second welding part 312 in the first direction e1 is connected to the second connection part 32. The other ends of the first welding part 311 and the second welding part 312 in the first direction e1 extend in a direction away from the second connection part 32 along the first direction e1, and the other ends of the first welding part 311 and the second welding part 312 are spaced apart along the second direction e2. Among them, the tab ear 21 is connected to the first welding part 311 and the second welding part 312 by ultrasonic welding. During the ultrasonic welding process, the welded object vibrates. Therefore, by spacing apart the free ends of the first welding part 311 and the second welding part 312, the influence of the vibration of the first welding part 311 and the second welding part 312 on each other can be reduced, so as to improve the welding efficiency and effect between the tab ear 21 and the connecting piece 3.

[0045] According to some embodiments of the present utility model, the distance between the second connecting portion 32 and the cover plate assembly 12 is greater than the distance between the first connecting portion 31 and the cover plate assembly 12. It can be understood that the pole column 4 is connected to the second connecting portion 32 and extends toward the cover plate assembly 12 relative to the second connecting portion 32. Therefore, by increasing the distance between the second connecting portion 32 and the cover plate assembly 12, the space occupied by the pole column 4 in the thickness direction of the cover plate assembly 12 can be saved, so that the space inside the housing 1 can be fully utilized, which is beneficial to reducing the overall size of the battery 100.

[0046] In a specific example, the connecting piece 3 is an integrally formed part, and the second connecting portion 32 is formed by bending one end of the first connecting portion 31 in the first direction e1 away from the cover plate assembly 12.

[0047] According to some embodiments of the present utility model, the pole column 4 includes a base 42 and a connecting protrusion 43 provided on the side of the base 42 facing the cover plate assembly 12. The connecting protrusion 43 passes through the cover plate assembly 12, and the insertion portion 41 is provided on the side of the base 42 facing away from the cover plate assembly 12. The side of the base 42 facing the cover plate assembly 12 is not higher than the side of the first connecting portion 31 facing the cover plate assembly 12. That is to say, the side of the base 42 facing the cover plate assembly 12 is flush with the side of the first connecting portion 31 facing the cover plate assembly 12; or the side of the base 42 facing the cover plate assembly 12 is lower than the side of the first connecting portion 31 facing the cover plate assembly 12, that is, in the thickness direction of the cover plate assembly 12, the distance between the side of the base 42 facing the cover plate assembly 12 and the cover plate assembly 12 is greater than the distance between the side of the first connecting portion 31 facing the cover plate assembly 12 and the cover plate assembly 12. Thus, the space on the side of the first connecting portion 31 facing the cover plate assembly 12 occupied by the base 42 can be avoided, so that the space inside the housing 1 can be fully utilized, which is beneficial to reducing the overall size of the battery 100.

[0048] In a specific example, the diameter of the base 42 is greater than the diameter of the insertion portion 41, and the diameter of the insertion portion 41 is greater than the diameter of the connecting protrusion 43. In the thickness direction of the cover plate assembly 12, the length of the connecting protrusion 43 is greater than the lengths of the base 42 and the insertion portion 41.

[0049] According to some embodiments of the present utility model, the cover plate assembly 12 further includes a cover plate body and a connecting block 122. An assembly hole penetrating in the thickness direction is formed on the cover plate body. The connecting block 122 is arranged in the assembly hole and forms an installation hole 123 penetrating in the thickness direction of the cover plate assembly 12. The pole post 4 includes a base 42 and a connecting protrusion 43. The base 42 is located on the side of the connecting block 122 facing the electrode group 2, and the connecting protrusion 43 is arranged on the side of the base 42 facing the connecting block 122. The connecting protrusion 43 passes through the installation hole 123 and is connected to the inner peripheral surface of the installation hole 123. That is to say, the electrical connection between the pole post 4 and the connecting block 122 is realized through the connection between the connecting protrusion 43 and the inner peripheral surface of the installation hole 123. Moreover, the pole post 4 is electrically connected to the electrode group 2 through the connection between the connecting piece 3 and the tab 21, so that the electric quantity of the electrode group 2 can be output through the connecting block 122. Among them, through the plug-in fit between the connecting protrusion 43 and the connecting block 122, the difficulty of installing the pole post 4 to the connecting block 122 can be better reduced, thereby the assembly efficiency of the battery 100 can be better improved. Among them, an insulating member is provided between the connecting block 122 and the cover plate body. The connecting block 122 can be fixed on the cover plate body by riveting or by welding. The fixing method of the connecting block 122 is not specifically limited here.

[0050] Specifically, the pole post 4 is connected to the connecting piece 3 as a whole before being connected to the connecting block 122. After the connecting piece 3 and the tab 21 are welded, the connecting protrusion 43 is inserted into the installation hole 123 from the inner side of the installation hole 123, so as to realize the connection between the electrode group 2 and the connecting block 122. It should be noted that in the description of the present application, the inner and the outer are relative to the inner space and the outer space of the housing 1.

[0051] According to some embodiments of the present utility model, the installation hole 123 includes a first hole section 1231 and a second hole section 1232. The connecting protrusion 43 is at least connected to the inner peripheral surface of the first hole section 1231. The second hole section 1232 is located on the side of the first hole section 1231 facing the electrode group 2. In the direction from the cover plate assembly 12 towards the electrode group 2, the inner peripheral surface of the second hole section 1232 extends obliquely towards the direction away from the central axis of the installation hole 123. That is to say, in the axial direction of the installation hole 123, the inner diameter of the end of the second hole section 1232 far from the first hole section 1231 is larger than the inner diameter of the end of the second hole section 1232 close to the first hole section 1231, that is, the end of the second hole section 1232 far from the first hole section 1231 has a larger opening size. Therefore, when the connecting protrusion 43 is inserted into the installation hole 123 from the end of the second hole section 1232 far from the first hole section 1231, the larger opening size enables the connecting protrusion 43 to enter the installation hole 123 more easily, thereby the assembly efficiency of the pole post 4 and the connecting block 122 can be improved.

[0052] Specifically, the connecting protrusion 43 passes through the first hole section 1231 and the second hole section 1232. In the thickness direction of the cover plate assembly 12, the inner diameter of the first hole section 1231 remains unchanged, the inner diameter of one end of the second hole section 1232 close to the first hole section 1231 is the same as that of the first hole section 1231, and the outer peripheral surface of the connecting protrusion 43 is spaced apart from the inner peripheral surface of the second hole section 1232.

[0053] According to some embodiments of the present invention, a welding space 1233 for accommodating a weld seam is defined between the outer peripheral surface of the end of the connecting protrusion 43 away from the base 42 and the inner peripheral surface of the mounting hole 123. Thus, the weld seam generated by welding between the connecting protrusion 43 and the connecting block 122 can be accommodated by the welding space 1233, which can prevent the generated weld seam from protruding from the outer side surface of the connecting block 122, thereby avoiding the influence of the weld seam on the flatness of the outer side surface of the connecting block 122, so that the outer side surface of the connecting block 122 can better fit the busbar structure, which is beneficial to improving the connection strength between the battery 100 and the busbar structure. In addition, through the welding space 1233, the welding position between the connecting protrusion 43 and the connecting block 122 can be better positioned, which is beneficial to improving the welding efficiency.

[0054] In a specific example, the welding space 1233 is formed in a ring shape. Therefore, after the weld seam between the connecting protrusion 43 and the connecting block 122 is formed, a good sealing effect can be formed between the pole 4 and the connecting block 122, which is beneficial to improving the sealing performance of the battery 100.

[0055] According to some embodiments of the present invention, a guiding portion 431 is formed on a section of the connecting protrusion 43 away from the base 42. In the direction from the electrode group 2 towards the cover plate assembly 12, the outer peripheral surface of the guiding portion 431 extends obliquely towards the direction close to the central axis of the mounting hole 123. Thus, through the guiding portion 431, the connecting protrusion 43 can more easily enter the mounting hole 123, thereby improving the assembly efficiency of the pole 4 and the connecting block 122. Among them, the welding space 1233 is jointly defined between the outer peripheral surface of the guiding portion 431 and the inner peripheral surface of the mounting hole 123. That is, on the basis of providing a guiding function, the outer peripheral surface of the guiding portion 431 can cooperate with the connecting block 122 to accommodate the weld seam, so that on the basis of meeting the guiding requirements and the requirements for accommodating the weld seam, the structure of the pole 4 can be simplified.

[0056] According to some embodiments of the present utility model, in the axial direction of the mounting hole 123, the end face of the connecting protrusion 43 away from the base 42 is located within the mounting hole 123 and is spaced apart from the end face of the connecting block 122 away from the base 42. Thereby, a receiving space can be formed between the side of the connecting protrusion 43 away from the base 42 and the inner peripheral surface of the mounting hole 123, inside the outer side surface of the connecting block 122, so as to avoid the weld seam affecting the flatness of the outer side surface of the connecting block 122, enabling the outer side surface of the connecting block 122 to better fit the busbar structure, which is beneficial to improving the connection strength between the battery 100 and the busbar structure.

[0057] In the present utility model, unless otherwise clearly defined and limited, terms such as "mounting", "connecting", "coupling", "fixing", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that: include: A shell and a cover plate assembly disposed at an opening of the shell; A pole group, arranged in the shell; A connecting piece, arranged in the housing and comprising a first connecting portion and a second connecting portion, wherein the pole tabs of the pole group are stacked and welded on a side of the first connecting portion facing the cover plate assembly, and a plug hole is formed on the second connecting portion; The pole is formed with a plug-in portion that is plugged into the plug-in hole and is welded to the second connecting portion.

2. The battery according to claim 1, characterized in that The first connection portion and the second connection portion are arranged along a first direction, and the first direction is perpendicular to a thickness direction of the cover plate assembly.

3. The battery according to claim 1, characterized in that The pole ears have multiple parts and are distributed on opposite sides of the first connecting part in the second direction. The first connecting part includes a first welding part and a second welding part arranged along the second direction. The first welding part and the second welding part are respectively used to connect with the pole ears located on opposite sides of the first connecting part in the second direction. At least parts of the first welding part and the second welding part are spaced apart along the second direction, and the second direction is perpendicular to the thickness direction of the cover plate assembly.

4. The battery according to claim 1, characterized in that A distance between the second connection portion and the cover plate assembly is greater than a distance between the first connection portion and the cover plate assembly.

5. The battery according to claim 4, characterized in that The pole includes a base and a connecting protrusion arranged on the side of the base facing the cover assembly, the connecting protrusion passes through the cover assembly, the plug-in portion is arranged on the side of the base facing away from the cover assembly, and the side of the base facing the cover assembly is not higher than the side of the first connecting portion facing the cover assembly.

6. The battery according to claim 1, characterized in that The cover plate assembly comprises: The cover plate body is formed with an assembly hole penetrating along the thickness direction; A connecting block is arranged in the assembly hole and forms a mounting hole that passes through the cover plate assembly in the thickness direction. The pole includes a base and a connecting protrusion. The base is located on the side of the connecting block facing the pole group. The connecting protrusion is arranged on the side of the base facing the connecting block. The connecting protrusion passes through the mounting hole and is connected to the inner circumferential surface of the mounting hole.

7. The battery according to claim 6, characterized in that The mounting hole includes a first hole segment and a second hole segment that are connected, the connecting protrusion is connected to at least the inner circumference of the first hole segment, the second hole segment is located on the side of the first hole segment facing the pole group, and in the direction from the cover plate assembly toward the pole group, the inner circumference of the second hole segment extends obliquely in a direction away from the central axis of the mounting hole.

8. The battery according to claim 6, characterized in that A welding space for accommodating a weld is defined between an outer circumferential surface of an end of the connecting protrusion away from the base and an inner circumferential surface of the mounting hole.

9. The battery according to claim 8, characterized in that One end of the connecting protrusion away from the base is formed as a guide portion. In the direction from the pole group toward the cover plate assembly, the outer peripheral surface of the guide portion extends obliquely toward the central axis direction close to the mounting hole, and the outer peripheral surface of the guide portion and the inner peripheral surface of the mounting hole jointly define the welding space.

10. The battery according to claim 6, characterized in that In the axial direction of the mounting hole, an end surface of the connecting protrusion away from the base is located in the mounting hole and is spaced apart from an end surface of the connecting block away from the base.

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