Battery and closure structure

Abstract

The application provides a battery and a sealing structure. The battery comprises a shell and a battery core. The shell comprises two oppositely arranged side plates, which enclose an accommodating cavity. The edges of the two side plates are fused to form a sealing layer. The battery core comprises a battery core body provided with the accommodating cavity, and a tab connected to the battery core body. The tab is clamped between the edges of the two side plates and penetrates through the sealing layer. The sealing layer comprises a first sealing section at the tab. The thickness of the first sealing section is greater than or equal to 114 microns and less than or equal to 134 microns. The battery provided by the application is characterized in that the battery core body is arranged in the accommodating cavity between the two side plates of the shell. The thickness of the first sealing section of the sealing layer between the edges of the two side plates of the shell at the tab is greater than or equal to 114 microns and less than or equal to 134 microns. The maximum thickness of the sealing layer is reduced, which is conducive to reducing the thickness of the edge of the battery at the tab and further reducing the overall thickness of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery and its end cap structure. Background Technology

[0002] In related technologies, batteries used in smart cards such as financial cards and logistics tracking cards typically require a relatively small thickness. However, because the battery casing needs to accommodate the tabs, the battery edge is thicker at the tabs, which limits the battery's application in smart cards. Utility Model Content

[0003] The embodiments of this application provide a battery and a cap structure that can improve the technical problem of the battery edge being too thick at the tab.

[0004] In a first aspect, embodiments of this application provide a battery, comprising: The outer casing includes two opposing side panels that enclose a receiving cavity, and a sealing layer is formed by welding the edges of the two side panels together. The battery cell includes a battery cell body having the receiving cavity, and a tab connected to the battery cell body, the tab being held between the edges of the two side plates and passing through the sealing layer; The sealing layer includes a first sealing section located at the tab, the thickness of which is greater than or equal to 114 micrometers and less than or equal to 134 micrometers.

[0005] In some embodiments, the compression of the first sealing segment is greater than or equal to 46 micrometers and less than or equal to 66 micrometers; and / or, the compression ratio of the first sealing segment is greater than or equal to 25.6% and less than or equal to 36.5%. Thus, a large compression is achieved during the process of fusing the first weld layer between the edges of the two side plates with the second weld layer covering the tab to form the first sealing segment of the sealing layer, reducing the thickness of the first sealing segment while providing a better sealing effect.

[0006] In some embodiments, the sealing layer includes a second sealing segment connected to the first sealing segment, the second sealing segment having a thickness greater than or equal to 34 micrometers and less than or equal to 54 micrometers, thereby giving the battery edge a reduced thickness at the non-tab location, which helps to reduce the overall thickness of the battery.

[0007] In some embodiments, the compression amount of the second sealing segment is greater than or equal to 16 micrometers and less than or equal to 36 micrometers; and / or, the compression ratio of the second sealing segment is greater than or equal to 22.9% and less than or equal to 51.4%. Thus, a large compression amount is achieved during the process of fusing the first weld layer between the edges of the two side plates to form the second sealing segment of the sealing layer, reducing the thickness H2 of the second sealing segment of the sealing layer while providing a better sealing effect.

[0008] In some embodiments, the edge of the battery includes a first edge segment corresponding to the first sealing segment, the thickness of which is greater than or equal to 250 micrometers and less than or equal to 270 micrometers. This allows for a thinner thickness at the edge of the battery corresponding to the first sealing segment, which helps reduce the overall thickness of the battery.

[0009] In some embodiments, the sealing layer includes a second sealing segment connected to the first sealing segment, and the edge of the battery includes a second edge segment corresponding to the second sealing segment, the thickness of the second edge segment being greater than or equal to 140 micrometers and less than or equal to 160 micrometers. This allows for a thinner thickness at the edge of the battery corresponding to the second sealing segment, which helps reduce the overall thickness of the battery.

[0010] In some embodiments, the tabs include a positive tab and a negative tab spaced apart along the edge extension direction of the battery, the first sealing section includes a first sub-sealing section located at the positive tab and a second sub-sealing section located at the negative tab, the thickness of the first sub-sealing section and / or the second sub-sealing section being greater than or equal to 114 micrometers and less than or equal to 134 micrometers, thereby reducing the thickness of the sealing layer at the positive tab and / or the negative tab, and thus reducing the overall thickness of the battery.

[0011] Secondly, embodiments of this application provide a sealing head structure for heat-sealing a battery as described above. The sealing head structure includes two sealing heads disposed opposite each other, with a space between the sealing heads for accommodating the battery. Each sealing head includes a heat-sealing surface located on the side of the sealing head facing the space. A groove is formed on the heat-sealing surface corresponding to the tab of the battery. The depth of the groove is greater than or equal to 55 micrometers and less than or equal to 65 micrometers. When the edges of the two side plates of the battery are heat-sealed using the sealing head structure, the edges of the battery corresponding to the tabs are accommodated within the grooves of the sealing heads. This grooves limit the thickness of the battery edges at the tabs, making the battery thinner at the tabs and thus reducing the overall thickness of the battery.

[0012] In some embodiments, the heat-sealing cover has a protruding abutment portion, and the abutment portions of the two end caps abut against each other, so that the heat-sealing covers of the two end caps have a gap. The height of the abutment portion relative to the heat-sealing cover is greater than or equal to 145 micrometers and less than or equal to 155 micrometers. Therefore, when the heat-sealing covers of the two end caps abut against the opposite surfaces of the two side plates of the battery to heat-seal the edges of the two side plates, the thickness of the battery edge can be made comparable to the gap between the heat-sealing covers of the two end caps, thereby accurately controlling the thickness of the battery edge.

[0013] In some embodiments, the end cap has two abutting portions, and the space is located between the two abutting portions.

[0014] The beneficial effects of the embodiments of this application are as follows: The battery provided in this application embodiment has its cell body disposed in a receiving cavity between two side plates of the casing, allowing the cell's tab to pass through a sealing layer between the edges of the two side plates of the casing. The thickness of the first sealing section of the sealing layer at the tab is greater than or equal to 114 micrometers and less than or equal to 134 micrometers. This reduces the maximum thickness of the sealing layer, which helps to reduce the thickness of the battery edge at the tab, thereby reducing the overall thickness of the battery. Attached Figure Description

[0015] 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.

[0016] Figure 1 A schematic diagram of the structure of one embodiment of the battery provided in this application; Figure 2 for Figure 1 A cross-sectional view along the AA direction; Figure 3 for Figure 1 A cross-sectional view along the BB direction; Figure 4 A cross-sectional view of an embodiment of the electrode tab and the second fusion layer provided in this application; Figure 5 A cross-sectional view of the side plate provided in an embodiment of this application; Figure 6 This is a schematic diagram of one embodiment of the head structure provided in this application.

[0017] Explanation of reference numerals in the attached figures: 2-Battery; 10-Casing; 101-Receiving cavity; 11-Side plate; 111-Metal layer; 112-First welded layer; 113-Insulating layer; 12-Sealing layer; 121-First sealing section; 1211-First sub-sealing section; 1212-Second sub-sealing section; 122-Second sealing section; 123-First edge section; 124-Second edge section; 20-Cell; 21-Cell body; 22-Taper; 221-Positive tab; 222-Negative tab; 23-Second welded layer; 3-Head structure; 30-Space; 31-Head; 311-Heat cover; 312-Groove; 313-Abutment part. Detailed Implementation

[0018] 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.

[0019] This application provides a battery and a cap structure.

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery provided in this application. Figure 2 for Figure 1 A cross-sectional view along the AA direction. Figure 3 for Figure 1 A cross-sectional view along the BB direction. (e.g.) Figures 1 to 3 As shown, the battery 2 includes a casing 10 and a cell 20. The casing 10 includes two side plates 11 arranged opposite to each other, and the two side plates 11 enclose a receiving cavity 101. The cell 20 includes a cell body 21 with the receiving cavity 101, and a tab 22 connected to the cell body 21. The tab 22 of the cell 20 extends out of the casing 10.

[0021] Continue to refer to Figure 2A sealing layer 12 is formed by welding the edges of the two side plates 11 together, thereby keeping the receiving cavity 101 of the outer casing 10 sealed and preventing the electrolyte in the receiving cavity 101 from leaking out from between the edges of the two side plates 11 of the outer casing 10. Specifically, the sealing layer 12 includes a first sealing section 121 located at the tab 22. The first sealing section 121 extends along the length direction of the edge of the battery 2. The sealing layer 12 also includes a second sealing section 122 connected to the first sealing section 121. The second sealing section 122 extends along the length direction of the edge of the battery 2. The first sealing section 121 and the second sealing section 122 are distributed along the edge of the battery 2.

[0022] Among them, such as Figure 4 As shown, a second fusion layer 23 is provided on the outer periphery of the tab 22. A first fusion layer 112 is provided on the side of the side plate 11 facing the receiving cavity 101. By arranging the two side plates 11 opposite each other and heating the edges of the two side plates 11, the first fusion layer 112 at the edges of the two side plates 11 is fused with the second fusion layer 23 on the outer periphery of the tab 22 to form the first sealing section 121 of the sealing layer 12. The first fusion layers 112 at the edges of the two side plates 11 are fused with each other to form the second sealing section 122 of the sealing layer 12.

[0023] The tabs 22 of the battery cell 20 are clamped between the edges of two side plates 11 and pass through the sealing layer 12. The battery cell 20 can be placed on one of the side plates 11 with the tabs 22 extending beyond the edge of the side plate 11. Then, the other side plate 11 is placed over the battery cell 20, clamping the tabs 22 between the edges of the two side plates 11. Next, the edges of the two side plates 11 are clamped by the end cap structure 3, and the edges of the side plates 11 are heated, causing the first weld layers 112 at the edges of the side plates 11 to weld together to form the sealing layer 12, through which the tabs 22 pass.

[0024] In some embodiments, the thickness H1 of the first sealing section 121 may be greater than or equal to 114 micrometers and less than or equal to 134 micrometers.

[0025] The battery 2 provided in this embodiment has its cell body 21 disposed in the receiving cavity 101 between the two side plates 11 of the outer casing 10, so that the tab 22 of the cell 20 passes through the sealing layer 12 between the edges of the two side plates 11 of the outer casing 10, and the thickness H1 of the first sealing section 121 of the sealing layer 12 at the tab 22 is greater than or equal to 114 micrometers and less than or equal to 134 micrometers. In this way, the maximum thickness of the sealing layer 12 is reduced, which is beneficial to reducing the thickness of the edge of the battery 2 at the tab 22, thereby reducing the overall thickness of the battery 2.

[0026] The orthographic projection of the first sealing section 121 on the thickness direction of the battery 2 covers the orthographic projection of the tab 22 on the thickness direction of the battery 2. The thickness H1 of the first sealing section 121 can be 116 micrometers, 118 micrometers, 120 micrometers, 123 micrometers, 125 micrometers, 130 micrometers, 132 micrometers, etc., and is not limited here.

[0027] In some embodiments, the compression of the first sealing segment 121 can be greater than or equal to 46 micrometers and less than or equal to 66 micrometers. This allows for a larger compression during the process of fusing the first weld layer 112 between the edges of the two side plates 11 with the second weld layer 23 covering the tab 22 to form the first sealing segment 121 of the sealing layer 12, reducing the thickness H1 of the first sealing segment 121 of the sealing layer 12 while providing a better sealing effect.

[0028] The compression amount of the first sealing section 121 is the difference between the sum of the thicknesses of the first weld layer 112 and the second weld layer 23 at the edges of the two side plates 11 and the thickness H1 of the first sealing section 121. The compression amount of the first sealing section 121 can be 48 micrometers, 50 micrometers, 51 micrometers, 54 micrometers, 55 micrometers, 57 micrometers, 60 micrometers, 64 micrometers, etc., and is not limited here.

[0029] In some embodiments, the compression ratio of the first sealing segment 121 can be greater than or equal to 25.6% and less than or equal to 36.5%. This allows for a larger compression amount during the process of fusing the first weld layer 112 between the edges of the two side plates 11 with the second weld layer 23 covering the tab 22 to form the first sealing segment 121 of the sealing layer 12, reducing the thickness H1 of the first sealing segment 121 of the sealing layer 12 while providing a better sealing effect.

[0030] The compression ratio of the first sealing section 121 is the ratio of the thickness H1 of the first sealing section 121 to the sum of the thicknesses of the first welded layer 112 and the second welded layer 23 at the edges of the two side plates 11. The compression ratio of the first sealing section 121 can be 25.8%, 26%, 28%, 29%, 30%, 33%, 35%, etc., and is not limited here.

[0031] It should be noted that the compression of the first sealing section 121 can be greater than or equal to 46 micrometers and less than or equal to 66 micrometers, and the compression ratio of the first sealing section 121 can be greater than or equal to 25.6% and less than or equal to 36.5%; or, the compression of the first sealing section 121 can be greater than or equal to 46 micrometers and less than or equal to 66 micrometers, or the compression ratio of the first sealing section 121 can be greater than or equal to 25.6% and less than or equal to 36.5%.

[0032] In some embodiments, the edge of the battery 2 includes a first edge segment 123 corresponding to the first sealing segment 121, wherein the thickness W1 of the first edge segment 123 is greater than or equal to 250 micrometers and less than or equal to 270 micrometers. This allows the edge of the battery 2 to have a thinner thickness at the first sealing segment 121, which is beneficial for reducing the overall thickness of the battery 2.

[0033] Wherein, the orthographic projection of the first edge segment 123 of battery 2 in the thickness direction of battery 2 covers the orthographic projection of the first sealing segment 121 in the thickness direction of battery 2. The thickness W1 of the first edge segment 123 can be 252 micrometers, 255 micrometers, 258 micrometers, 260 micrometers, 263 micrometers, 267 micrometers, 269 micrometers, etc., and is not limited here.

[0034] like Figure 5 As shown, the side plate 11 includes a metal layer 111, and a first welded layer 112 and an insulating layer 113 disposed on both sides of the metal layer 111. The metal layer 111 can be made of aluminum. The thickness of the metal layer 111 is 35 micrometers. The first welded layer 112 can be made of polypropylene (PP). The thickness of the first welded layer 112 is 35 micrometers. The insulating layer 113 can be made of nylon (Polyamide, PA). The thickness of the insulating layer 113 is 18 micrometers. The thickness of the first edge of the battery 2 is the sum of the thickness H1 of the first sealing section 121 and the thicknesses of the two metal layers 111 and the two insulating layers 113.

[0035] In some embodiments, the tab 22 includes a positive tab 221 and a negative tab 222 spaced apart along the edge extension direction of the battery 2, and the first sealing section 121 includes a first sub-sealing section 1211 located at the positive tab 221 and a second sub-sealing section 1212 located at the negative tab 222. The thickness of the first sub-sealing section 1211 and / or the second sub-sealing section 1212 can be greater than or equal to 114 micrometers and less than or equal to 134 micrometers, thereby reducing the thickness of the sealing layer 12 at the positive tab 221 and / or the negative tab 222, and thus reducing the overall thickness of the battery 2.

[0036] The thickness of the first sub-sealing section 1211 and / or the second sub-sealing section 1212 can be 116 micrometers, 118 micrometers, 120 micrometers, 123 micrometers, 125 micrometers, 130 micrometers, 132 micrometers, etc., and there is no limitation here.

[0037] In some embodiments, such as Figure 2As shown, the sealing layer 12 includes a second sealing section 122 connected to the first sealing section 121. The thickness H2 of the second sealing section 122 is greater than or equal to 34 micrometers and less than or equal to 54 micrometers, thereby giving the edge of the battery 2 a reduced thickness at the non-tab 22, which is beneficial to reducing the overall thickness of the battery 2.

[0038] The orthographic projection of the second sealing section 122 on the thickness direction of the battery 2 is offset from the orthographic projection of the tab 22 on the thickness direction of the battery 2. The thickness H2 of the second sealing section 122 can be 35 micrometers, 38 micrometers, 40 micrometers, 43 micrometers, 45 micrometers, 50 micrometers, 52 micrometers, etc., and is not limited here.

[0039] In some embodiments, the compression amount of the second sealing segment 122 can be greater than or equal to 16 micrometers and less than or equal to 36 micrometers. This allows for a larger compression amount during the process of fusing the first weld layer 112 between the edges of the two side plates 11 to form the second sealing segment 122 of the sealing layer 12, reducing the thickness H2 of the second sealing segment 122 of the sealing layer 12 while providing a better sealing effect.

[0040] The compression amount of the second sealing section 122 is the difference between the sum of the thicknesses of the first welded layers 112 at the edges of the two side plates 11 and the thickness H2 of the second sealing section 122. The compression amount of the second sealing section 122 can be 18 micrometers, 20 micrometers, 21 micrometers, 24 micrometers, 25 micrometers, 27 micrometers, 30 micrometers, 34 micrometers, etc., and there is no limitation here.

[0041] In some embodiments, the compression ratio of the second sealing segment 122 can be greater than or equal to 22.9% and less than or equal to 51.4%. This allows for a larger compression amount during the process of fusing the first weld layer 112 between the edges of the two side plates 11 to form the second sealing segment 122 of the sealing layer 12, reducing the thickness H2 of the second sealing segment 122 of the sealing layer 12 while providing a better sealing effect.

[0042] The compression ratio of the second sealing section 122 is the ratio of the thickness H2 of the second sealing section 122 to the sum of the thicknesses of the first welded layers 112 at the edges of the two side plates 11. The compression ratio of the second sealing section 122 can be 23.8%, 26%, 28%, 32%, 35%, 40%, 45%, 50%, etc., and is not limited here.

[0043] It should be noted that the compression of the second sealing section 122 can be greater than or equal to 16 micrometers and less than or equal to 36 micrometers, and the compression ratio of the second sealing section 122 can be greater than or equal to 22.9% and less than or equal to 51.4%; or, the compression of the second sealing section 122 can be greater than or equal to 16 micrometers and less than or equal to 36 micrometers, or the compression ratio of the second sealing section 122 can be greater than or equal to 22.9% and less than or equal to 51.4%.

[0044] In some embodiments, the sealing layer 12 includes a second sealing section 122 connected to the first sealing section 121, and the edge of the battery 2 includes a second edge section 124 corresponding to the second sealing section 122. The thickness W2 of the second edge section 124 is greater than or equal to 140 micrometers and less than or equal to 160 micrometers. This allows for a thinner thickness at the edge of the battery 2 corresponding to the second sealing section 122, which is beneficial for reducing the overall thickness of the battery 2.

[0045] Wherein, the orthographic projection of the second edge segment 124 of battery 2 in the thickness direction of battery 2 covers the orthographic projection of the second sealing segment 122 in the thickness direction of battery 2. The thickness W2 of the second edge segment 124 can be 150 micrometers, 152 micrometers, 155 micrometers, 158 micrometers, etc., and is not limited here.

[0046] Embodiments of this application also provide a cap structure for heat-sealing the battery as described above.

[0047] Figure 6 This is a schematic diagram of one embodiment of the head structure provided in this application. Figure 6 As shown, the end cap structure 3 includes two end caps 31 arranged opposite each other, with a space 30 formed between the end caps 31 for accommodating the battery 2. The end cap 31 includes a heat-sealing surface 311, which is located on the side of the end cap 31 facing the space 30. When the battery 2 is heat-sealed by the end cap structure 3, the heat-sealing surface 311 of the two end caps 31 of the end cap structure 3 can be made to abut against the opposite surfaces of the two side plates 11 of the battery 2. Then, the edge of the side plate 11 is heated by the end cap 31, causing the first fusion layer 112 of the edge of the side plate 11 to melt. The portion of the first fusion layer 112 located at the tab 22 is fused with the second fusion layer 23 covering the tab 22 to form a first sealing section 121. The portions of the first fusion layer 112 at the edges of the two side plates 11 located at non-tab 22 locations are fused with each other to form a second sealing section 122.

[0048] Specifically, the heat-sealing cover 311 can form a groove 312 corresponding to the tab 22 of the battery 2, and the depth H3 of the groove 312 is greater than or equal to 55 micrometers and less than or equal to 65 micrometers. When the edges of the two side plates 11 of the battery 2 are heat-sealed by the end cap structure 3, the edge of the battery 2 corresponding to the tab 22 is accommodated in the groove 312 of the end cap 31, thereby limiting the thickness of the edge of the battery 2 at the tab 22 by the groove 312, making the thickness of the battery 2 at the tab 22 thinner, and thus reducing the overall thickness of the battery 2.

[0049] The depth H3 of the groove 312 can be 56 micrometers, 58 micrometers, 60 micrometers, 61 micrometers, 63 micrometers, etc., and there is no limitation here.

[0050] In some embodiments, the heat-sealing cover 311 is formed with two grooves 312 corresponding to two tabs 22 to limit the thickness of the edge of the battery 2 at the two tabs 22.

[0051] In some embodiments, the heat-sealing cover 311 may have a protruding abutment portion 313, and the abutment portions 313 of the two end caps 31 abut against each other, so that the heat-sealing covers 311 of the two end caps 31 have a gap. The height H4 of the abutment portion 313 relative to the heat-sealing cover 311 may be greater than or equal to 145 micrometers and less than or equal to 155 micrometers. Therefore, when the heat-sealing covers 311 of the two end caps abut against the opposing surfaces of the two side plates 11 of the battery 2 to heat-seal the edges of the two side plates 11 of the battery 2, the thickness of the edge of the battery 2 can be made comparable to the gap between the heat-sealing covers 311 of the two end caps 31, thereby accurately controlling the thickness of the edge of the battery 2.

[0052] The height H4 of the contact portion 313 relative to the heat-sealing surface 311 can be 146 micrometers, 148 micrometers, 150 micrometers, 151 micrometers, 153 micrometers, etc., and there is no limitation here.

[0053] In some embodiments, the end cap 31 may be provided with two abutment portions 313, and the space 30 for accommodating the battery 2 is located between the two abutment portions 313. Thus, when the two abutment portions 313 of the end cap 31 abut against the two abutment portions 313 of the other end cap 31 in a one-to-one correspondence, the distance between the heat-sealing surfaces 311 of the two end caps 31 can be kept more stable.

[0054] 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 battery, characterized by, include: The outer casing includes two opposing side panels that enclose a receiving cavity, and a sealing layer is formed by welding the edges of the two side panels together. The battery cell includes a battery cell body having the receiving cavity, and a tab connected to the battery cell body, the tab being held between the edges of the two side plates and passing through the sealing layer; The sealing layer includes a first sealing section located at the tab, the thickness of which is greater than or equal to 114 micrometers and less than or equal to 134 micrometers.

2. The battery of claim 1, wherein, The compression of the first sealing section is greater than or equal to 46 micrometers and less than or equal to 66 micrometers; and / or the compression ratio of the first sealing section is greater than or equal to 25.6% and less than or equal to 36.5%.

3. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The sealing layer includes a second sealing section connected to the first sealing section, the thickness of the second sealing section being greater than or equal to 34 micrometers and less than or equal to 54 micrometers.

4. The battery as described in claim 3, characterized in that, The compression of the second sealing section is greater than or equal to 16 micrometers and less than or equal to 36 micrometers; and / or the compression ratio of the second sealing section is greater than or equal to 22.9% and less than or equal to 51.4%.

5. The battery as described in claim 1, characterized in that, The edge of the battery includes a first edge segment corresponding to the first sealing segment, the thickness of the first edge segment being greater than or equal to 250 micrometers and less than or equal to 270 micrometers.

6. The battery as claimed in claim 1, characterized in that, The sealing layer includes a second sealing segment connected to the first sealing segment, and the edge of the battery includes a second edge segment corresponding to the second sealing segment, the thickness of the second edge segment being greater than or equal to 140 micrometers and less than or equal to 160 micrometers.

7. The battery according to any one of claims 1 to 6, characterized in that, The tabs include a positive tab and a negative tab spaced apart along the edge of the battery. The first sealing section includes a first sub-sealing section located at the positive tab and a second sub-sealing section located at the negative tab. The thickness of the first sub-sealing section and / or the second sub-sealing section is greater than or equal to 114 micrometers and less than or equal to 134 micrometers.

8. A head structure, characterized in that, For heat sealing the battery according to any one of claims 1 to 7, the end cap structure includes two end caps disposed opposite each other, with a space formed between the end caps for accommodating the battery, the end cap including a heat-sealing surface, the heat-sealing surface being located on the side of the end cap facing the space, the heat-sealing surface having a groove formed at the tab of the battery corresponding to the electrode, the groove having a depth greater than or equal to 55 micrometers and less than or equal to 65 micrometers.

9. The head structure as described in claim 8, characterized in that, The heat-sealing cover has a protruding abutment portion, and the abutment portions of the two end caps abut against each other so that the heat-sealing covers of the two end caps are spaced apart. The height of the abutment portion relative to the heat-sealing cover is greater than or equal to 145 micrometers and less than or equal to 155 micrometers.

10. The head structure as described in claim 9, characterized in that, The end cap is provided with two abutting portions, and the space is located between the two abutting portions.

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