Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and belongs to the technical field of batteries. Each single battery comprises a cover plate assembly and an electrode assembly, and the electrode assembly is arranged on one side of the cover plate assembly in the thickness direction; the cover plate assembly comprises a cover plate body, a pole and a connecting sheet, the cover plate body is provided with an assembling hole. The pole penetrates through the assembling hole and comprises a first pole body and a second pole body, the first pole body is arranged on the side, away from the electrode assembly, of the cover plate body and is provided with a first protruding part in a protruding mode towards the assembling hole, the second pole body is arranged on the side, facing the electrode assembly, of the cover plate body and partially penetrates through the assembling hole, and a through hole is formed in the second pole body in the thickness direction; the first convex part penetrates through the through hole and is connected with the second column body, so that the first column body and the second column body jointly clamp the cover plate body, a riveting process is cancelled, and the stability of the anti-explosion valve is ensured; by forming the avoiding hole corresponding to the through hole in the connecting piece, welding of the first protruding part and the second column body is achieved, and the assembling efficiency and the product yield are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a single battery and a battery pack. BACKGROUND

[0002] In the assembly process of the single battery, the pole post is first riveted to the cover plate body, and then welded to the connecting piece. The traditional riveting scheme seriously affects the stability of the explosion-proof valve assembled on the cover plate body. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims to overcome the technical problem that the riveting assembly mode of the pole post and the cover plate body in the current single battery assembly process easily affects the stability of the explosion-proof valve, and another object of the utility model is to provide a battery pack.

[0004] TECHNICAL SCHEME: The utility model discloses a single battery, which comprises a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction.

[0005] The cover plate assembly comprises:

[0006] a cover plate body having an assembly hole;

[0007] a pole post penetrating the assembly hole, wherein the pole post comprises a first column body and a second column body, the first column body is arranged on the side of the cover plate body away from the electrode assembly and protrudes towards the assembly hole with a first protruding part, the second column body is arranged on the side of the cover plate body facing the electrode assembly and partially penetrates the assembly hole, the second column body is provided with a through hole along the thickness direction, the first protruding part penetrates the through hole and is connected with the second column body, and the first column body and the second column body jointly clamp the two sides of the cover plate body along the thickness direction.

[0008] a connecting piece electrically connected with the electrode assembly and the second column body, respectively, wherein the connecting piece is provided with an avoiding hole corresponding to the through hole.

[0009] In some embodiments, the electrode assembly comprises a tab, the connecting piece comprises a first connecting section and a second connecting section connected with each other, the first connecting section is connected with the tab, the second connecting section is connected with the second column body, and the avoiding hole is arranged on the second connecting section.

[0010] In some embodiments, the second column body is provided with a first sinking groove on the side facing the electrode assembly along the thickness direction, the first sinking groove is connected with the through hole, and the orthographic projection of the through hole on the plane perpendicular to the thickness direction is located in the first sinking groove.

[0011] The first sink groove has a first size a mm in the thickness direction, satisfying a≥0.15.

[0012] In some embodiments, the cover plate assembly further comprises a first welding portion, which is located in the through hole and respectively connects the first protruding portion and the second column.

[0013] In some embodiments, the first column comprises a first main portion and a first connecting portion, the first connecting portion is arranged on a side of the cover plate body away from the electrode assembly, the first main portion is arranged between the first connecting portion and the second column, and a normal projection of the first main portion on a plane perpendicular to the thickness direction is located in the assembly hole, and the first protruding portion is arranged on a side of the first main portion away from the first connecting portion.

[0014] In some embodiments, the first main portion and the first connecting portion are integrally formed;

[0015] And / or, the first protruding portion and the first main portion are integrally formed.

[0016] In some embodiments, the second column comprises a second main portion and a second connecting portion, the second main portion is partially arranged in the assembly hole, the through hole penetrates the second main portion, the second connecting portion is arranged on a side of the cover plate body facing the electrode assembly, and surrounds the second main portion.

[0017] In some embodiments, the second main portion and the first column form a second sink groove with an opening facing the cover plate body;

[0018] The cover plate body further comprises a sealing member, the sealing member comprises a first sealing segment, a second sealing segment and a third sealing segment, the first sealing segment is clamped between the second connecting portion and the cover plate body, the second sealing segment is arranged in the assembly hole and located between the second main portion and the cover plate body, the third sealing segment is arranged in the second sink groove and clamped between the first column and the second main portion, and the second sealing segment respectively connects the first sealing segment and the third sealing segment.

[0019] In some embodiments, a side outer edge of the second main portion facing the first column is provided with a second sink groove;

[0020] Alternatively, the first column is partially arranged in the assembly hole, and a side outer edge of the second main portion facing the first column is provided with a second sink groove.

[0021] Embodiments of the present application also disclose a battery pack comprising the single battery as described in the above embodiments.

[0022] Beneficial effects: The single cell in this embodiment includes a cover plate assembly and an electrode assembly. The electrode assembly is disposed on one side of the cover plate assembly along the thickness direction. The cover plate assembly includes: a cover plate body, an electrode post, and a connecting piece. The cover plate body has an assembly hole. The electrode post passes through the assembly hole and includes a first post and a second post. The first post is disposed on the side of the cover plate body away from the electrode assembly and has a first protrusion protruding into the assembly hole. The second post is disposed on the side of the cover plate body facing the electrode assembly and partially passes through the assembly hole. The second post has a through hole along the thickness direction. The first protrusion passes through the through hole and connects to the second post. The first post and the second post together sandwich the two sides of the cover plate body along the thickness direction. The connecting piece electrically connects the electrode assembly and the second post respectively. The connecting piece has a clearance hole, which is correspondingly disposed with the through hole. The first protrusion has a through hole and is connected to the second column, so that the first column and the second column together clamp the cover plate body, realizing the assembly of the cover plate assembly without riveting process, avoiding the deformation of the cover plate body under stress, which would affect the stability of the explosion-proof valve; at the same time, the connecting piece is electrically connected to the electrode assembly and the second column respectively. By opening the avoidance hole on the connecting piece, the welding of the first protrusion and the second column is realized, which improves the assembly efficiency and product yield.

[0023] The battery pack of this application embodiment includes the single battery cell as described in the above embodiments. Therefore, it can have all the technical features and effects of the single battery cell described above, which will not be repeated here. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a three-dimensional schematic diagram of a single battery cell in an embodiment of this application;

[0026] Figure 2 for Figure 1 A schematic diagram of an explosion of a single cell in a battery cell;

[0027] Figure 3 This is a top view of a single battery cell in an embodiment of this application;

[0028] Figure 4 for Figure 3 Cross-sectional view along the AA direction;

[0029] Figure 5 for Figure 2 Top view of the connection between the middle electrode assembly and the connecting piece;

[0030] Figure 6 is Figure 4 a local enlarged schematic view at B;

[0031] Figure 7 is Figure 4 a local enlarged schematic view at C;

[0032] Marker: 1, cover plate assembly; 2, electrode assembly; X, thickness direction; 11, cover plate body; 110, assembly hole; 12, pole column; 121, first column body; 122, second column body; 1211, first protruding part; 1220, through hole; 13, connecting piece; 130, avoiding hole; 21, pole lug; 131, first connecting section; 132, second connecting section; 1221, first sink groove; 14, first welding part; 1212, first main body part; 1213, first connecting part; 1222, second main body part; 1223, second connecting part; 1224, second sink groove; 15, sealing piece; 151, first sealing section; 152, second sealing section; 153, third sealing section; 3, shell; 16, upper plastic. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or components 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 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 explicitly specified. The terms "first", "second", "third" and the like are only for the convenience of description and are named by numbering the parts or embodiments, and do not imply an important order between the parts or between the embodiments.

[0035] It should also be noted that in the drawings of the present application, the arrow marked X indicates the thickness direction, and in the description of the present application, the thickness direction is introduced to more clearly define the structure and relative positional relationship of the components in a single battery and a battery pack. In actual implementation, the thickness direction is perpendicular to the direction of the cover plate body.

[0036] As a preamble to the embodiments of the present application, in the assembly process of the single battery, the pole post is generally riveted to the cover plate body first, and then welded to the connecting piece. In the traditional riveting scheme, the cover plate body is easily subjected to instantaneous impact stress, which seriously affects the stability of the explosion-proof valve assembled on the cover plate body. At the same time, the riveting block occupies the space in the thickness direction inside the single battery, resulting in low space utilization. In addition, the structure of the connecting piece is complex, not easy to manufacture, and the welding process and assembly efficiency are low.

[0037] Therefore, the embodiments of the present application provide a single battery, which aims to solve at least one of the above technical problems.

[0038] Please refer to Figures 1 to 7 The single battery of the embodiments of the present application comprises a cover plate assembly 1 and an electrode assembly 2, and the electrode assembly 2 is arranged on one side of the cover plate assembly 1 along the thickness direction X. It should be understood that the single battery also comprises a shell 3, and the shell 3 has a receiving cavity and an opening. The receiving cavity is used to accommodate the electrode assembly 2, and the cover plate assembly 1 is used to seal the opening of the shell 3 to achieve the sealing of the shell 3.

[0039] Specifically, the cover plate assembly 1 comprises a cover plate body 11, a pole post 12 and a connecting piece 13. The cover plate body 11 has an assembly hole 110. The pole post 12 penetrates the assembly hole 110, and the pole post 12 comprises a first column body 121 and a second column body 122. The first column body 121 is arranged on the side of the cover plate body 11 away from the electrode assembly 2, and a first protruding part 1211 is protrudingly arranged in the assembly hole 110. The second column body 122 is arranged on the side of the cover plate body 11 facing the electrode assembly 2, and part of the second column body 122 penetrates the assembly hole 110. The second column body 122 is provided with a through hole 1220 along the thickness direction X. The first protruding part 1211 penetrates the through hole 1220 and is connected with the second column body 122. The first column body 121 and the second column body 122 jointly clamp the two sides of the cover plate body 11 along the thickness direction X. The connecting piece 13 is electrically connected with the electrode assembly 2 and the second column body 122 respectively. The connecting piece 13 has an avoiding hole 130, and the avoiding hole 130 is arranged corresponding to the through hole 1220. It should be understood that the cover plate body 11 is also provided with a mounting hole for assembling an explosion-proof valve. In the assembly process, the first column body 121 and the second column body 122 are respectively assembled to the two sides of the cover plate body 11 along the thickness direction X. The first protruding part 1211 protrudingly arranged in the assembly hole 110 of the first column body 121 is inserted and matched with the through hole 1220 arranged on the second column body 122 along the thickness direction X, and the first protruding part 1211 and the second column body 122 are connected, so that the first column body 121 and the second column body 122 jointly clamp the cover plate body 11. In the assembly process, plastic (such as rubber) is also assembled between the first column body 121 and the cover plate body 11. Figure 6 And Figure 7The first column 121 and the cover plate body 11 are connected by the plastic connecting cover plate body 11, so as to realize the insulation support between the first column 121 and the cover plate body 11; the sealing element 15 is assembled between the second column 122 and the cover plate body 11, and the second column 122 and the cover plate body 11 are connected through the sealing element 15, so as to realize the insulation and sealing between the second column 122 and the cover plate body 11.

[0040] It also needs to be understood that in the assembly process, the first protrusion 1211 and the second column 122 can be welded through the through hole 1220 first, so as to ensure the connection stability of the first column 121 and the second column 122, and then the connecting sheet 13 and the second column 122 are welded; or, the connecting sheet 13 and the second column 122 are welded first, and then the first protrusion 1211 and the second column 122 are welded through the avoiding hole 130 on the connecting sheet 13 and the through hole 1220 on the second column 122; after welding is completed, the tab 21 of the electrode assembly 2 and the connecting sheet 13 are welded, and finally the electrode assembly 2 is combined and the electrode assembly 2 and the cover plate assembly 1 are assembled into the shell 3, the whole assembly process is efficient, and the riveting block and the riveting scheme are cancelled, the stability and safety of the explosion-proof valve assembly are ensured, the product yield is high, the space in the thickness direction X of the shell 3 is improved, and the space utilization is improved. Furthermore, the connecting sheet 13 has a simple structure, reduces the product internal resistance, and the welding steps of the connecting sheet 13 and the second column 122 and the welding steps of the first protrusion 1211 and the second column 122 can be completed at one time, reducing the welding process and parts, reducing the processing cost, and improving the competitiveness of the product.

[0041] Please refer to Figure 2 、 Figure 4 and Figure 5 In some embodiments, the electrode assembly 2 includes the tab 21, the connecting sheet 13 includes the first connecting section 131 and the second connecting section 132 connected together, the first connecting section 131 is connected with the tab 21, the second connecting section 132 is connected with the second column 122, and the avoiding hole 130 is arranged on the second connecting section 132. It needs to be understood that the connecting sheet 13 can be a flat sheet structure, and the second connecting section 132 can have the same shape as the bottom of the second column 122, both being annular structures, which reduces the internal resistance of the product and has high welding efficiency and good stability with the second column 122.

[0042] Please refer to Figure 6As shown, in some embodiments, the second column body 122 is provided with a first recessed groove 1221 on the side facing the electrode assembly 2 along the thickness direction X, the first recessed groove 1221 is in communication with the through hole 1220, and the orthogonal projection of the through hole 1220 on the plane perpendicular to the thickness direction X is located in the first recessed groove 1221; the first recessed groove 1221 has a first size a mm along the thickness direction X, and a≥0.15 is satisfied. It should be understood that, by providing the first recessed groove 1221, on the one hand, the weight of the second column body 122 can be reduced, and the competitiveness of the product can be improved; on the other hand, the thickness size of the first recessed groove 1221 is greater than or equal to 0.15 mm, which can provide sufficient accommodation space for the weld mark excess height formed by the welding between the first convex part 1211 and the second column body 122, ensure the stability of the connection between the first column body 121 and the second column body 122, and avoid the weld mark excess height from pressing the electrode assembly 2 after assembly, thereby improving the safety of the electrode assembly 2.

[0043] Referring to Figure 6 As shown, in some embodiments, the cover plate assembly 1 further comprises a first welding part 14, which is located in the through hole 1220 and respectively connects the first convex part 1211 and the second column body 122. It should be understood that the first welding part 14 can improve the connection stability of the first convex part 1211 and the second column body 122, improve the connection sealing performance, and avoid the risk of air leakage.

[0044] Referring to Figure 6 As shown, in some embodiments, the first column body 121 comprises a first main body part 1212 and a first connecting part 1213, the first connecting part 1213 is arranged on the side of the cover plate body 11 away from the electrode assembly 2, the first main body part 1212 is arranged between the first connecting part 1213 and the second column body 122, and the orthogonal projection of the first main body part 1212 on the plane perpendicular to the thickness direction X is located in the assembly hole 110, and the first convex part 1211 is arranged on the side of the first main body part 1212 away from the first connecting part 1213. It should be understood that, in the present embodiment, the first connecting part 1213 is used to cooperate with the upper plastic cover to seal the assembly hole 110, the size of the first main body part 1212 is smaller than the size of the assembly hole 110, and the first main body part 1212 is located between the first connecting part 1213 and the second column body 122, the first main body part 1212 can be partially arranged in the assembly hole 110, and can provide a support point for the sealing element 15, so that the local position of the sealing element 15 is clamped between the first main body part 1212 and the second column body 122, thereby reducing the thickness size of the sealing element 15, ensuring that the sealing element 15 has sufficient elastic deformation, reducing the assembly error, and improving the assembly sealing performance.

[0045] Referring to Figure 6 and Figure 7As shown, in some embodiments, the first body part 1212 and the first connecting part 1213 are integrally formed; and / or, the first protruding part 1211 and the first body part 1212 are integrally formed. It should be understood that when the first protruding part 1211, the first body part 1212 and the first connecting part 1213 are integrally formed, they can be the positive electrode post 12 made of the same material or the negative electrode post 12 made of the same material; when only the first protruding part 1211 and the first body part 1212 are integrally formed, the first body part 1212 and the first connecting part 1213 can be integrally formed by composite assembly, wherein the first body part 1212 can be made of copper material and the first connecting part 1213 can be made of aluminum material.

[0046] As shown in FIG. 1, the cover plate body 11 is provided with a plurality of assembly holes 110, and each assembly hole 110 is provided with a second post 122 and a first post 121. Figure 6 As shown in FIG. 1, the cover plate body 11 is provided with a plurality of assembly holes 110, and each assembly hole 110 is provided with a plurality of first posts 121 and a plurality of second posts 122. Figure 7 As shown, in some embodiments, the second post 122 includes a second body part 1222 and a second connecting part 1223, the second body part 1222 is partially arranged in the assembly hole 110, the through hole 1220 penetrates the second body part 1222, the second connecting part 1223 is arranged on the side of the cover plate body 11 facing the electrode assembly 2 and surrounds the second body part 1222. It should be understood that the second connecting part 1223 can cover the assembly hole 110, and during assembly, the second connecting part 1223 and the cover plate body 11 are insulated and sealed by clamping the sealing member 15 or the lower plastic. The second connecting part 1223 is in an annular structure and surrounds the outer periphery of the second body part 1222, and forms an outer step structure with the second body part 1222, which can improve the stability of the assembly of the second post 122. In some embodiments, the first recess 1221 provided on the second post 122 makes the inside of the second post 122 have an inner step structure, and through the cooperation of the inner and outer steps, the overall weight of the second post 122 is lighter, the stress is more balanced, and the structural stability is higher.

[0047] As shown in FIG. 1, the cover plate body 11 is provided with a plurality of assembly holes 110, and each assembly hole 110 is provided with a second post 122 and a first post 121. Figure 6 As shown in FIG. 1, the cover plate body 11 is provided with a plurality of assembly holes 110, and each assembly hole 110 is provided with a plurality of first posts 121 and a plurality of second posts 122. Figure 7As shown, in some embodiments, the second body part 1222 and the first column 121 form a second sink groove 1224 with an opening facing the cover plate body 11; the cover plate body 11 further comprises a sealing member 15, the sealing member 15 comprises a first sealing section 151, a second sealing section 152 and a third sealing section 153, the first sealing section 151 is clamped between the second connecting part 1223 and the cover plate body 11, the second sealing section 152 is arranged in the assembly hole 110 and located between the second body part 1222 and the cover plate body 11, the third sealing section 153 is arranged in the second sink groove 1224 and clamped between the first column 121 and the second body part 1222, and the second sealing section 152 is connected with the first sealing section 151 and the third sealing section 153 respectively. It should be understood that the Z-shaped sealing ring formed by the first sealing section 151, the second sealing section 152 and the third sealing section 153, wherein the first sealing section 151 realizes insulation and sealing between the second connecting part 1223 and the cover plate body 11, ensuring the sealing between the pole column 12 and the cover plate body 11; the third sealing section 153 realizes insulation and sealing between the first column 121 and the second body part 1222, ensuring the sealing between the first protruding part 1211 and the second column 122 and the sealing between the first body part 1212 and the second body part 1222, preventing the risk of air leakage caused by defects such as welding blowout between the first protruding part 1211 and the second column 122, and ensuring the air tightness of the product.

[0048] In some embodiments, the second body part 1222 is provided with a second sink groove 1224 (as shown in Figure 6 With Figure 7 As shown); or, the first column 121 is partially arranged in the assembly hole 110, and the second sink groove 1224 is arranged on the side outer edge of the second body part 1222 (not shown in the figure). It should be understood that, by arranging the second sink groove 1224 on the second body part 1222, the second column 122 has a double-tower structure, further improving the structural stability of the second column 122; at the same time, when the second sink groove 1224 is arranged on the second body part 1222, the thickness of the sealing ring can be further reduced, ensuring the assembly stability and sealing between the first column 121 and the second column 122; when the second sink groove 1224 is arranged on the first column 121, the weight of the first column 121 is reduced, the bearing pressure of the cover plate assembly 1 is reduced, and the assembly stability of the pole column 12 is improved.

[0049] The battery pack disclosed in the embodiments of the present application comprises the single battery as described in the above embodiments. Therefore, all the technical features and technical effects of the single battery described above can be achieved, which will not be described here again.

[0050] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0051] The above describes in detail a single battery and a battery pack provided by the embodiments of the present application, and the principles and implementation manners of the present application are described by using specific examples. The above embodiment descriptions are only used to help understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. The modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell, characterized by, The cover plate assembly comprises a cover plate body and an electrode assembly arranged on one side of the cover plate body along a thickness direction; The cover plate assembly comprises: a cover plate body having an assembly hole; a pole column penetrating the assembly hole, the pole column comprising: a first pole body arranged on a side of the cover plate body away from the electrode assembly and protruding with a first protrusion into the assembly hole, and a second pole body arranged on a side of the cover plate body facing the electrode assembly and partially penetrating the assembly hole, the second pole body being provided with a through hole along the thickness direction, the first protrusion penetrating the through hole and being connected with the second pole body, and the first pole body and the second pole body jointly clamping two sides of the cover plate body along the thickness direction; a connecting piece electrically connected with the electrode assembly and the second pole body, respectively, the connecting piece being provided with an avoiding hole corresponding to the through hole.

2. The cell according to claim 1, wherein The electrode assembly comprises a tab, the connecting piece comprises a first connecting segment and a second connecting segment connected with each other, the first connecting segment is connected with the tab, the second connecting segment is connected with the second pole body, and the avoiding hole is arranged on the second connecting segment.

3. The cell according to claim 1, wherein The second pole body is provided with a first recess along the thickness direction on a side facing the electrode assembly, the first recess is connected with the through hole, and a projection of the through hole on a plane perpendicular to the thickness direction is located in the first recess. The first recess has a first dimension a mm along the thickness direction, and a≥0.15 is satisfied.

4. The cell according to claim 3, wherein The cover plate assembly further comprises a first welding portion, the first welding portion is located in the through hole and connects the first protrusion and the second pole body, respectively.

5. The cell according to claim 1, wherein The first pole body comprises a first main body portion and a first connecting portion, the first connecting portion is arranged on a side of the cover plate body away from the electrode assembly, the first main body portion is arranged between the first connecting portion and the second pole body, a projection of the first main body portion on a plane perpendicular to the thickness direction is located in the assembly hole, and the first protrusion is arranged on a side of the first main body portion away from the first connecting portion.

6. The cell according to claim 5, wherein The first main body portion and the first connecting portion are integrally formed; and / or, the first protrusion and the first main body portion are integrally formed.

7. The cell according to claim 1, wherein The second pole body comprises a second main body portion and a second connecting portion, the second main body portion is partially arranged in the assembly hole, the through hole penetrates the second main body portion, and the second connecting portion is arranged on a side of the cover plate body facing the electrode assembly and surrounds the second main body portion.

8. The cell according to claim 7, wherein The second main body portion and the first pole body surround a second recess with an opening facing the cover plate body; The cover plate body further comprises a sealing member, the sealing member comprises a first sealing segment, a second sealing segment and a third sealing segment, the first sealing segment is clamped between the second connecting portion and the cover plate body, the second sealing segment is arranged in the assembly hole and between the second body portion and the cover plate body, the third sealing segment is arranged in the second sink and clamped between the first column body and the second body portion, and the second sealing segment is connected with the first sealing segment and the third sealing segment respectively.

9. The cell according to claim 8, wherein A second sink is arranged at a side outer edge of the first column body. Alternatively, the first column body is partially arranged in the assembly hole, and a second sink is arranged at a side outer edge of the second body portion.

10. A battery pack, characterized by, A single battery comprising any one of the above claims 1 to 9.

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