battery

Abstract

The application provides a battery, comprising a shell and a battery core, the shell comprises two oppositely arranged side plates, the two side plates enclose a containing cavity, and a sealing layer is formed by fusion between the edges of the two side plates; the battery core comprises a positive plate, a diaphragm and a negative plate which are stacked, the battery core is arranged in the containing cavity, the diaphragm is between the positive plate and the negative plate, the side surface of the positive plate away from the diaphragm is attached to the side surface of one of the side plates, and the side surface of the negative plate away from the diaphragm is attached to the side surface of the other side plate; the battery core further comprises a positive tab which penetrates through the sealing layer, the positive plate is provided with a connecting groove on the side surface facing the diaphragm, and the positive tab is connected to the bottom surface of the connecting groove. According to the application, the connecting groove is arranged on the side surface of the positive plate facing the diaphragm, and the positive tab is connected to the bottom surface of the connecting groove, so that at least part of the positive tab is arranged in the connecting groove, the overall thickness of the battery core at the connection between the positive tab and the positive plate is reduced, and the overall thickness of the battery is further reduced.

Description

[0001] This application claims priority to Chinese Patent Application No. 202510937151.8, filed with the Chinese Patent Office on July 8, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery. Background Technology

[0003] Batteries used in smart cards such as financial cards and logistics tracking cards typically require a small thickness. However, in related technologies, the batteries are relatively thick, which limits their application in smart cards. Utility Model Content

[0004] The embodiments of this application provide a battery that can improve the technical problem of excessive battery thickness.

[0005] 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. A battery cell includes a positive electrode, a separator, and a negative electrode stacked together. The battery cell is disposed in the receiving cavity. The separator is located between the positive electrode and the negative electrode. The side surface of the positive electrode facing away from the separator is attached to the side surface of one of the side plates, and the side surface of the negative electrode facing away from the separator is attached to the side surface of the other side plate. The battery cell also includes a positive electrode tab that passes through the sealing layer. A connecting groove is formed on the side of the positive electrode sheet facing the diaphragm, and the positive electrode tab is connected to the bottom surface of the connecting groove.

[0006] In some embodiments, the positive electrode is fused to the separator, thereby increasing the bonding area and tightness between the positive electrode and the separator, and helping to reduce the overall thickness of the positive electrode and the separator, thereby reducing the overall thickness of the battery.

[0007] In some embodiments, the positive electrode includes a current collector and an active material layer disposed on the surface of the current collector facing the separator, the active material layer being fused to the separator, thereby making the fusion of the positive electrode and the separator more stable and convenient.

[0008] In some embodiments, the thickness of the positive electrode sheet is greater than or equal to 140 micrometers and less than or equal to 160 micrometers. This allows the positive electrode sheet to have good electrical performance and strength while minimizing its thickness, which is beneficial for increasing the overall battery thickness.

[0009] In some embodiments, the thickness of the battery is less than or equal to 0.5 mm, thereby giving the battery a thinner thickness; and / or, The thickness of the negative electrode sheet is greater than or equal to 40 micrometers and less than or equal to 65 micrometers, which allows the negative electrode sheet to have good electrical performance and strength while minimizing the thickness of the positive electrode sheet, thus improving the overall battery thickness; and / or, The thickness of the separator is greater than or equal to 10 micrometers and less than or equal to 25 micrometers, thereby minimizing the separator thickness without affecting its performance, and thus reducing the battery thickness; and / or, The thickness of the side plate is greater than or equal to 85 micrometers and less than or equal to 95 micrometers, thereby giving the side plate high strength while minimizing its thickness, thus reducing the thickness of the battery.

[0010] In some embodiments, the positive electrode includes a current collector and an active material layer disposed on the surface of the current collector facing the separator. The positive electrode tab is connected to the side of the current collector facing the separator, and the active material layer has an opening corresponding to the positive electrode tab to form the connection groove. This allows for a more convenient formation of the connection groove on the side of the positive electrode facing the separator.

[0011] In some embodiments, the battery cell further includes a negative electrode tab passing through the sealing layer, the negative electrode tab being connected to the side of the negative electrode sheet facing away from the separator. This avoids the negative electrode tab occupying the contact area between the negative electrode sheet and the separator, and prevents the negative electrode tab from directly contacting the separator, thus avoiding damage to the separator.

[0012] In some embodiments, a sealing layer is formed by welding the edges of the two side plates together; the sealing layer includes a first sealing section located at the positive tab and the negative tab, the thickness of the first sealing section being greater than or equal to 114 micrometers and less than or equal to 134 micrometers, which 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.

[0013] 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.

[0014] 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.

[0015] The beneficial effects of the embodiments of this application are as follows: The battery provided in this application embodiment has a connecting groove opened on the side of the positive electrode sheet of the cell facing the separator, and the positive electrode tab is connected to the bottom surface of the connecting groove. This allows at least a portion of the positive electrode tab to be accommodated in the connecting groove, thereby reducing the overall thickness of the cell at the connection between the positive electrode tab and the positive electrode sheet, and thus reducing the overall thickness of the battery. Attached Figure Description

[0016] 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.

[0017] 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 2 Enlarged view of point A in the middle; Figure 4 for Figure 1 A cross-sectional view along the BB direction; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 for Figure 1 A cross-sectional view along the CC direction; Figure 7 A cross-sectional view of one embodiment of the side plate provided in this application.

[0018] 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; 211-Positive electrode; 2111-Connecting groove; 2112-Current collector; 2113-Active material layer; 212-Separator; 213-Negative electrode; 22-Taper; 221-Positive electrode; 222-Negative electrode; 23-Second welded layer. Detailed Implementation

[0019] 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.

[0020] This application provides a battery.

[0021] 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 2 A magnified view of point A in the middle. (See image below.) Figures 1 to 3 As shown, the battery 2 includes a casing 10 and a battery cell 20. The casing 10 includes two opposing side plates 11, which together form a receiving cavity 101. The battery cell 20 is disposed within the receiving cavity 101. The battery cell 20 includes a battery cell body 21 with the receiving cavity 101, and a tab 22 connected to the battery cell body 21. The tab 22 of the battery cell 20 extends out of the casing 10.

[0022] Continue to refer to Figure 2 and Figure 3 A sealing layer 12 is formed by welding the edges of the two side plates 11 together, thereby keeping the receiving cavity 101 of the housing 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 housing 10. Specifically, as Figure 6 As shown, the sealing layer 12 includes a first sealing segment 121 located at the tab 22. The first sealing segment 121 extends along the length direction of the edge of the battery 2. The sealing layer 12 also includes a second sealing segment 122 connected to the first sealing segment 121. The second sealing segment 122 extends along the length direction of the edge of the battery 2. The first sealing segment 121 and the second sealing segment 122 are distributed along the edge of the battery 2.

[0023] Among them, such as Figure 3 , Figure 6 and Figure 7As 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.

[0024] 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 a capping structure (not shown), and the edges of the side plates 11 are heated, causing the first weld layer 112 of the edge of the side plate 11 to melt. The portion of the first weld layer 112 at the tab 22 is welded to the second weld layer 23 covering the tab 22 to form a first sealing section 121. The portions of the first weld layer 112 at the edges of the two side plates 11 that are not at the tab 22 are welded to each other to form a second sealing section 122.

[0025] In some embodiments, the cell body 21 of the cell 20 includes a positive electrode 211, a separator 212 and a negative electrode 213 stacked together. The separator 212 is located between the positive electrode 211 and the negative electrode 213. The side surface of the positive electrode 211 facing away from the separator 212 is attached to the side surface of one of the side plates 11, and the side surface of the negative electrode 213 facing away from the separator 212 is attached to the side surface of the other side plate 11.

[0026] Among them, the tab 22 of the battery cell 20 includes a positive tab 221 that passes through the sealing layer 12. A connecting groove 2111 is provided on the side of the positive electrode plate 211 facing the diaphragm 212, and the positive tab 221 is connected to the bottom surface of the connecting groove 2111.

[0027] The battery 2 provided in this application embodiment has a connecting groove 2111 on the side of the positive electrode 211 of the cell 20 facing the separator 212, and the positive electrode tab 221 is connected to the bottom surface of the connecting groove 2111. This allows at least a portion of the positive electrode tab 221 to be accommodated in the connecting groove 2111, thereby reducing the overall thickness of the cell 20 at the connection between the positive electrode tab 221 and the positive electrode 211, and thus reducing the overall thickness of the battery 2.

[0028] In some embodiments, the positive electrode 211 includes a current collector 2112 and an active material layer 2113 disposed on the surface of the current collector 2112 facing the separator 212. A positive electrode tab 221 is connected to the side of the current collector 2112 facing the separator 212, and the active material layer 2113 has an opening corresponding to the positive electrode tab 221 to form a connection groove 2111. This allows for a more convenient formation of the connection groove 2111 on the side of the positive electrode 211 facing the separator 212.

[0029] In some embodiments, the positive electrode 211 can be fused with the separator 212, thereby increasing the bonding area and bonding tightness between the positive electrode 211 and the separator 212, and helping to reduce the overall thickness of the positive electrode 211 and the separator 212, thereby reducing the overall thickness of the battery 2.

[0030] Specifically, the positive electrode 211 includes a current collector 2112 and an active material layer 2113 disposed on the surface of the current collector 2112 facing the separator 212. The active material layer 2113 is fused to the separator 212, thereby making the fusion of the positive electrode 211 and the separator 212 more stable and convenient.

[0031] In some embodiments, the thickness of the battery 2 can be less than or equal to 0.5 mm, thereby giving the battery 2 a thinner thickness. The thickness of the battery 2 can be 0.48 mm, 0.45 mm, 0.43 mm, 0.42 mm, etc., and is not limited here.

[0032] In some embodiments, the thickness of the positive electrode 211 can be greater than or equal to 140 micrometers and less than or equal to 160 micrometers. This allows the positive electrode 211 to have good electrical performance and strength while minimizing its thickness, which is beneficial for increasing the thickness of the battery 2.

[0033] The thickness of the positive electrode 211 can be 142 micrometers, 143 micrometers, 145 micrometers, 148 micrometers, 150 micrometers, 153 micrometers, 155 micrometers, or 158 micrometers, and there is no limitation here.

[0034] In some embodiments, the thickness of the negative electrode 213 can be greater than or equal to 40 micrometers and less than or equal to 65 micrometers. This allows the negative electrode 213 to have good electrical performance and strength while minimizing the thickness of the positive electrode 211, which is beneficial for increasing the thickness of the battery 2.

[0035] The thickness of the negative electrode 213 can be 42 micrometers, 45 micrometers, 50 micrometers, 55 micrometers, 60 micrometers, or 63 micrometers, and there is no limitation here.

[0036] In some embodiments, the thickness of the separator 212 may be greater than or equal to 10 micrometers and less than or equal to 25 micrometers, thereby minimizing the thickness of the separator 212 without affecting its performance, and thus reducing the thickness of the battery 2.

[0037] The thickness of the diaphragm 212 can be 11 micrometers, 12 micrometers, 16 micrometers, 20 micrometers, 23 micrometers, etc., and there is no limitation here.

[0038] In some embodiments, the thickness of the side plate 11 can be greater than or equal to 85 micrometers and less than or equal to 95 micrometers, thereby giving the side plate 11 high strength while minimizing the thickness of the side plate 11, thereby reducing the thickness of the battery 2.

[0039] The thickness of the side plate 11 can be 86 micrometers, 88 micrometers, 89 micrometers, 90 micrometers, 92 micrometers, 94 micrometers, etc., and there is no limitation here.

[0040] In some embodiments, such as Figure 4 and Figure 5 As shown, the battery cell 20 also includes a negative electrode tab 222 that passes through the sealing layer 12. The negative electrode tab 222 is connected to the side of the negative electrode plate 213 facing away from the separator 212. This avoids the negative electrode tab 222 occupying the contact area between the negative electrode plate 213 and the separator 212, and avoids the problem of the negative electrode tab 222 directly contacting the separator 212, which could easily damage the separator 212.

[0041] In some embodiments, a sealing layer 12 is fused between the edges of the two side plates 11. The sealing layer 12 includes a first sealing segment 121 located at the positive tab 221 and the negative tab 222, the thickness H1 of the first sealing segment 121 being greater than or equal to 114 micrometers and less than or equal to 134 micrometers. This reduces the maximum thickness of the sealing layer 12, which is beneficial for reducing the thickness of the edges of the battery 2 at the positive tab 221 and the negative tab 222, thereby reducing the overall thickness of the battery 2.

[0042] The orthographic projection of the first sealing section 121 in the thickness direction of the battery 2 covers the orthographic projections of the positive electrode tab 221 and the negative electrode tab 222 in 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.

[0043] In some embodiments, the first sealing section 121 includes a first sub-sealing section 1211 located at the positive electrode tab 221 and a second sub-sealing section 1212 located at the negative electrode 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 electrode tab 221 and / or the negative electrode tab 222, and thus reducing the overall thickness of the battery 2.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] like Figure 7 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.

[0048] In some embodiments, the sealing layer 12 includes a second sealing section 122 connected to the first sealing section 121. The thickness 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 in that, 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. A battery cell includes a positive electrode, a separator, and a negative electrode stacked together. The battery cell is disposed in the receiving cavity. The separator is located between the positive electrode and the negative electrode. The side surface of the positive electrode facing away from the separator is attached to the side surface of one of the side plates, and the side surface of the negative electrode facing away from the separator is attached to the side surface of the other side plate. The battery cell also includes a positive electrode tab that passes through the sealing layer. A connecting groove is formed on the side of the positive electrode sheet facing the diaphragm, and the positive electrode tab is connected to the bottom surface of the connecting groove.

2. The battery as described in claim 1, characterized in that, The positive electrode is fused to the separator.

3. The battery as described in claim 2, characterized in that, The positive electrode includes a current collector and an active material layer disposed on the surface of the current collector facing the separator, the active material layer being fused to the separator.

4. The battery as described in claim 1, characterized in that, The thickness of the positive electrode is greater than or equal to 140 micrometers and less than or equal to 160 micrometers.

5. The battery as described in claim 1, characterized in that, The thickness of the battery is less than or equal to 0.5 mm; and / or, The thickness of the negative electrode sheet is greater than or equal to 40 micrometers and less than or equal to 65 micrometers; and / or, The thickness of the diaphragm is greater than or equal to 10 micrometers and less than or equal to 25 micrometers; and / or, The thickness of the side plate is greater than or equal to 85 micrometers and less than or equal to 95 micrometers.

6. The battery according to any one of claims 1 to 5, characterized in that, The positive electrode includes a current collector and an active material layer disposed on the surface of the current collector facing the diaphragm. The positive electrode tab is connected to the side of the current collector facing the diaphragm, and the active material layer has an opening corresponding to the positive electrode tab to form the connection groove.

7. The battery as described in claim 5, characterized in that, The battery cell also includes a negative electrode tab that passes through the sealing layer and is connected to the side of the negative electrode sheet opposite to the diaphragm.

8. The battery as claimed in claim 7, characterized in that, A sealing layer is formed by welding the edges of the two side plates together; the sealing layer includes a first sealing section located at the positive electrode tab and the negative electrode tab, the thickness of the first sealing section being greater than or equal to 114 micrometers and less than or equal to 134 micrometers.

9. The battery as claimed in claim 8, characterized in that, 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.

10. The battery as claimed in claim 8, 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.

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