Battery cover plate patch and secondary battery

Abstract

The utility model provides a kind of battery cover plate patch and secondary battery, battery cover plate patch includes insulating layer and adhesive layer, adhesive layer is connected in the thickness direction of battery cover plate patch one end surface of insulating layer, battery cover plate patch includes first hollow part, first hollow part is through the two ends of adhesive layer in the thickness direction of battery cover plate patch, the projection of first hollow part along the thickness direction of battery cover plate patch towards the body of insulating layer overlaps with insulating layer, first hollow part is used to cover the first product identification part of battery cover plate so that the first product identification part on battery cover plate can be completely exposed when battery cover plate patch is pasted, avoid the direct covering of adhesive layer to first product identification part. When it is necessary to trace battery information and tear off battery cover plate patch, since first product identification part area is originally not adhered with glue, fundamentally eliminates the problem of glue residue pollution or covering first product identification part, ensures the clarity of product traceability information.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery cover patch and a secondary battery. Background Technology

[0002] Square batteries are a commonly used structure for lithium-ion power batteries, generally consisting of a cover plate, casing, cell assembly, electrolyte, and internal and external insulation protection structures. External insulation of the casing is typically achieved through methods such as spraying insulating materials or wrapping with insulating tape; insulation of the cover plate is generally achieved by attaching insulating cover plates.

[0003] Cover plate patches generally consist of an insulating layer and an adhesive layer. The adhesive layer is bonded to the cover plate to secure the cover plate patch to the cover plate. In existing cover plate patches, the insulating layer and the adhesive layer have the same shape; that is, except for the opening position on the insulating layer (used to expose structures such as poles and explosion-proof valves), the end face of the insulating layer facing the cover plate is covered with the adhesive layer.

[0004] To facilitate battery traceability, product identification sections are currently installed on the battery cover to identify information such as the manufacturer and product model. Since different battery structures may be manufactured by different companies, multiple product identification sections may exist on the cover. To avoid confusion, subsequent battery manufacturers often cover these sections with cover stickers. When a battery malfunctions, removing the cover sticker is necessary to identify the previous manufacturer's information. However, the adhesive layer of the cover sticker can easily remain on the cover, obscuring the product identification sections and affecting battery traceability. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defect in the prior art where the adhesive layer of the cover plate patch covers the product identification part set by the manufacturer, which makes it easy for the adhesive layer to remain on the cover plate after the cover plate patch is peeled off, thus affecting the traceability of the battery. The present invention provides a battery cover plate patch and a secondary battery.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A battery cover patch includes an insulating layer and an adhesive layer. The adhesive layer is connected to one end face of the insulating layer in the thickness direction of the battery cover patch. The battery cover patch includes a first cutout portion that penetrates both ends of the adhesive layer in the thickness direction of the battery cover patch. The projection of the first cutout portion toward the insulating layer along the thickness direction of the battery cover patch overlaps with the body of the insulating layer. The first cutout portion is used to cover a first product identification portion of the battery cover.

[0008] In this solution, the first cutout allows the first product identification part on the battery cover to be fully exposed when the battery cover patch is applied, avoiding direct coverage of the first product identification part by the adhesive layer. When the battery cover patch is removed to trace battery information, since there is no adhesive adhering to the first product identification part area, the problem of adhesive residue contamination or obscuring of the first product identification part is fundamentally eliminated, ensuring that the product traceability information is clear, readable, and easily accessible.

[0009] Preferably, the projection of the first cutout portion toward the insulating layer along the thickness direction of the battery cover patch is located on the body of the insulating layer; there is a gap between the two ends of the first cutout portion in the length direction of the battery cover patch and the corresponding two ends of the adhesive layer in the length direction of the battery cover patch, and there is a gap between the two ends of the first cutout portion in the width direction of the battery cover patch and the corresponding two ends of the adhesive layer in the width direction of the battery cover patch.

[0010] In this solution, the above-mentioned settings ensure that the adhesive layer has sufficient edge bonding area, ensuring the overall adhesion and sealing reliability of the battery cover patch, and preventing the battery cover patch from lifting or falling off.

[0011] Preferably, the battery cover patch satisfies one or more of the following conditions:

[0012] a1. The distance between the two ends of the first hollow part in the length direction of the battery cover patch and the corresponding two ends of the adhesive layer in the length direction of the battery cover patch is greater than or equal to 3mm.

[0013] b1. The distance between the two ends of the first hollow part in the width direction of the battery cover patch and the corresponding two ends of the adhesive layer in the width direction of the battery cover patch is greater than or equal to 3mm.

[0014] In this solution, by specifically quantifying the minimum spacing between the edge of the first hollow part and the edge of the adhesive layer, it is ensured that the adhesive layer has sufficient width to form an effective adhesive strength band, effectively resisting peeling stress, enhancing the battery cover patch's resistance to warping and detachment during long-term use, and ensuring the long-term stability and reliability of the product.

[0015] Preferably, the battery cover patch further includes a plurality of second cutouts, which are spaced apart along the length direction of the battery cover patch, and the second cutouts penetrate the insulating layer and the adhesive layer at both ends in the thickness direction of the battery cover patch;

[0016] The battery cover patch meets one of the following conditions:

[0017] a2. The first cutout portion is disposed between two adjacent second cutout portions in the length direction of the battery cover plate patch, and the first cutout portion has a gap between its two ends in the length direction of the battery cover plate patch and the adjacent second cutout portions on the corresponding side.

[0018] b2. The first cutout portion is disposed between one end of the adhesive layer in the length direction of the battery cover patch and the second cutout portion, and the first cutout portion is spaced apart from the end of the battery cover patch facing the second cutout portion in the length direction of the battery cover patch and the adjacent second cutout portion.

[0019] In this solution, the above-mentioned settings ensure that the adhesive layer has sufficient edge bonding area, ensuring the overall adhesion and sealing reliability of the battery cover patch, and preventing the battery cover patch from lifting or falling off.

[0020] Preferably, when the first cutout is disposed between two adjacent second cutouts in the length direction of the battery cover patch, the distance between the two ends of the first cutout in the length direction of the battery cover patch and the adjacent second cutouts on the corresponding side is greater than or equal to 3mm.

[0021] When the first cutout is located between one end of the adhesive layer in the length direction of the battery cover patch and the second cutout, the distance between both ends of the first cutout in the length direction of the battery cover patch and the corresponding end of the adhesive layer in the length direction of the battery cover patch and the adjacent second cutout is greater than or equal to 3mm.

[0022] In this solution, by specifically quantifying the minimum spacing between the edge of the first cutout and the edge of the second cutout and / or the adhesive layer, it is ensured that the adhesive layer has sufficient width to form an effective adhesive strength band, effectively resisting peel stress, enhancing the battery cover patch's resistance to warping and detachment during long-term use, and guaranteeing the long-term stability and reliability of the product.

[0023] Preferably, the cross-section of the first hollowed-out portion is rectangular.

[0024] In this design, the rectangular shape best matches the shape of common graphic codes such as QR codes and barcodes, making the most efficient use of space. Furthermore, the rectangular structure is easy to manufacture, reducing processing difficulty.

[0025] Preferably, the adhesive layer is a backing adhesive fixed on the insulating layer, and the battery cover patch further includes release paper, which is attached to the end of the adhesive layer away from the insulating layer in the thickness direction of the battery cover patch.

[0026] In this solution, the release paper effectively protects the adhesive layer from contamination or damage before transportation, storage, and installation, ensuring its initial adhesion.

[0027] A secondary battery, the secondary battery comprising a battery cover and a battery cover patch as described above;

[0028] The battery cover plate is provided with a first product identification part, and the first cutout part of the battery cover plate patch covers the first product identification part.

[0029] In this solution, the first cutout allows the first product identification part on the battery cover to be fully exposed when the battery cover patch is applied, avoiding direct coverage of the first product identification part by the adhesive layer. When the battery cover patch is removed to trace battery information, since there is no adhesive adhering to the first product identification part area, the problem of adhesive residue contamination or obscuring of the first product identification part is fundamentally eliminated, ensuring that the product traceability information is clear, readable, and easily accessible.

[0030] Preferably, the first product identification part includes a graphic code, and the projection of the graphic code toward the adhesive layer along the thickness direction of the battery cover patch is located within the first hollow part.

[0031] In this solution, the above settings ensure that each module (black and white blocks) of the graphic code is not obscured or contaminated by glue, guaranteeing that the scanning device can quickly and accurately read all the information.

[0032] Preferably, the first product identification part further includes a text recognition structure, which is located outside the graphic code, and the projection of the text recognition structure toward the adhesive layer along the thickness direction of the battery cover patch is located within the first hollow part.

[0033] In this solution, the above setup provides dual traceability protection. Even if the barcode scanning device malfunctions or the graphic code is partially damaged, operators can still manually identify and trace the source by directly observing the exposed text information, which greatly enhances the reliability of battery traceability.

[0034] The significant advantages of this invention are as follows: the first cutout allows the first product identification part on the battery cover to be fully exposed when the battery cover patch is applied, preventing the adhesive layer from directly covering the first product identification part. When the battery cover patch is removed to trace battery information, since there is no adhesive in the area of ​​the first product identification part, the problem of adhesive residue contamination or obscuring of the first product identification part is fundamentally eliminated, ensuring that the product traceability information is clear, readable, and easily accessible. Attached Figure Description

[0035] Figure 1This is a partial structural diagram of a secondary battery according to an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the structure of a battery cover plate according to an embodiment of the present invention.

[0037] Figure 3 This is a partial structural schematic diagram of a battery cover patch according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the adhesive layer structure according to an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] Battery cover 1

[0041] pole column 11

[0042] Explosion-proof valve 12

[0043] First Product Identification Department 13

[0044] Image code 131

[0045] Text recognition structure 132

[0046] Second Product Identification Department 14

[0047] Battery cover patch 2

[0048] Insulation layer 21

[0049] Adhesive layer 22

[0050] First outer edge 221

[0051] Second outer edge 222

[0052] Third outer edge 223

[0053] Fourth outer edge 224

[0054] Release paper 23

[0055] First hollow section 24

[0056] Fifth outer edge 241

[0057] Sixth outer edge 242

[0058] 7th outer edge 243

[0059] Eighth outer edge 244

[0060] Second hollow section 25

[0061] Extreme column avoidance zone 251

[0062] Explosion-proof valve clearance zone 252

[0063] Second Product Identification Department Avoidance Zone 253 Detailed Implementation

[0064] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0065] like Figure 1 As shown, this embodiment discloses a secondary battery, including a casing (not shown), a battery cover plate 1, a cell assembly (not shown), and a battery cover plate patch 2. The battery cover plate 1 covers the opening of the casing to form a sealed receiving space to receive the cell assembly. The battery cover plate patch 2 is adhered to the end face of the battery cover plate 1 away from the receiving space to provide insulation for the outer surface of the battery cover plate 1.

[0066] like Figure 1 and Figure 2 As shown, the battery cover 1 is provided with a terminal post 11, an explosion-proof valve 12, a first product identification part 13, and a second product identification part 14. The terminal post 11 is used for electrical connection with external devices, the explosion-proof valve 12 is used for depressurization when the internal pressure of the containment space is too high, and the first product identification part 13 and the second product identification part 14 are used to trace product information from different manufacturers. In this embodiment, the first product identification part 13 is the product identification part that needs to be covered by the battery cover patch 2, while the second product identification part 14 does not need to be covered by the battery cover patch 2.

[0067] like Figure 1 , Figure 3 and Figure 4 As shown, the battery cover patch 2 includes an insulating layer 21, an adhesive layer 22, a release paper 23, a first cutout portion 24, and a second cutout portion 25.

[0068] like Figure 1 and Figure 3 As shown, the insulating layer 21 is a non-transparent structure. The adhesive layer 22 is connected to the end face of the insulating layer 21 facing the battery cover 1 in the thickness direction of the battery cover patch 2, for bonding with the battery cover 1. In this embodiment, the adhesive layer 22 is a backing adhesive fixed to the insulating layer 21. Before the battery cover patch 2 is connected to the battery cover 1, the release paper 23 is connected to the end of the adhesive layer 22 away from the insulating layer 21 in the thickness direction of the battery cover patch 2, to effectively protect the adhesive layer 22 from contamination or damage before transportation, storage, and installation, ensuring its initial adhesive strength. When it is necessary to bond the battery cover patch 2 to the battery cover 1, the release paper 23 is peeled off to expose the adhesive layer 22.

[0069] like Figure 1 and Figure 4As shown, the first cutout 24 penetrates the adhesive layer 22 at both ends of the battery cover patch 2 in the thickness direction. The projection of the first cutout 24 toward the insulating layer 21 along the thickness direction of the battery cover patch 2 overlaps with the body of the insulating layer 21, meaning that the end of the first cutout 24 facing the insulating layer 21 is closed by the insulating layer 21. The first cutout 24 covers the first product identification part 13 of the battery cover 1, and the size of the first cutout 24 is larger than the size of the first product identification part 13 of the battery cover 1, so that the first product identification part 13 on the battery cover 1 can be fully exposed when the battery cover patch 2 is pasted, avoiding direct coverage of the first product identification part 13 by the adhesive layer 22. When the battery cover patch 2 is peeled off to trace battery information, since there is no adhesive adhering to the area of ​​the first product identification part 13, the problem of adhesive residue contamination or obscuring of the first product identification part 13 is fundamentally eliminated, ensuring that the product traceability information is clear, readable, and easily accessible.

[0070] Specifically, such as Figure 2 As shown, the first product identification unit 13 in this embodiment includes a graphic code 131 and a text recognition structure 132. The text recognition structure 132 is located outside the graphic code 131. The graphic code 131 can be a QR code, barcode, or other structure that can be recognized by a scanning device. The text recognition structure 132 specifically displays product information in text form, such as the product model. The first product identification unit 13 includes two identification methods, providing dual traceability protection. Even if the scanning device malfunctions or the graphic code 131 is partially damaged, operators can still perform manual identification and traceability by directly observing the exposed text information, greatly enhancing the reliability of battery traceability.

[0071] In this embodiment, the projections of the graphic code 131 and the text recognition structure 132 toward the adhesive layer 22 along the thickness direction of the battery cover patch 2 are both located within the first cutout portion 24, to ensure that each module (black and white block) of the graphic code 131 and the text information are not obscured or contaminated by the adhesive, and to ensure that the scanning device can quickly and accurately read all the information.

[0072] In other alternative embodiments, the first product identification unit 13 may also include only one of the graphic code 131 and the character recognition structure 132.

[0073] Furthermore, such as Figure 4 As shown, the cross-section of the first cutout portion 24 in this embodiment is rectangular. The shape of the rectangle best matches the shape of common QR codes, barcodes, and other graphic codes 131, making the most efficient use of space. Moreover, the rectangular structure is easy to process and manufacture, reducing processing difficulty.

[0074] In other alternative embodiments, the cross-section of the first hollow portion 24 may also be in the shape of a circle, a polygon, or other shapes.

[0075] like Figure 1 and Figure 4 As shown, in this embodiment, there are multiple second cutouts 25, which are spaced apart along the length of the battery cover patch 2. Each second cutout 25 penetrates the insulating layer 21 and the adhesive layer 22 at both ends in the thickness direction of the battery cover patch 2, meaning it penetrates the battery cover patch 2. The multiple second cutouts 25 in this embodiment include a terminal post avoidance area 251, an explosion-proof valve avoidance area 252, and a second product identification part avoidance area 253, etc., to expose the terminal post 11, the explosion-proof valve 12, and the second product identification part 14 on the battery cover 1, ensuring the normal function of the secondary battery. In this embodiment, the second product identification part 14 only includes a graphic code. In other alternative embodiments, the second product identification part 14 can also be a combination of a graphic code and a text recognition structure, or only a text recognition structure.

[0076] like Figure 4 As shown, the projection of the first hollow portion 24 toward the insulating layer 21 along the thickness direction of the battery cover patch 2 is located on the body of the insulating layer 21. The outer periphery of the first hollow portion 24 is provided with the body of the adhesive layer 22 to ensure that the adhesive layer 22 has sufficient edge bonding area, to ensure the overall adhesion and sealing reliability of the battery cover patch 2, and to prevent the battery cover patch 2 from lifting or falling off.

[0077] Specifically, such as Figure 1 and Figure 4 As shown, the adhesive layer 22 includes a first outer edge 221 and a second outer edge 222 located on both sides of the battery cover patch 2 along its length, and a third outer edge 223 and a fourth outer edge 224 located on both sides of the battery cover patch 2 along its width. The first cutout portion 24 includes a fifth outer edge 241 and a sixth outer edge 242 located on both sides of the battery cover patch 2 along its length, and a seventh outer edge 243 and an eighth outer edge 244 located on both sides of the battery cover patch 2 along its width. In this embodiment, there is a gap between the first outer edge 221 and the fifth outer edge 241, and between the second outer edge 222 and the sixth outer edge 242, along with a gap between the third outer edge 223 and the seventh outer edge 243, and between the fourth outer edge 224 and the eighth outer edge 244, along with a gap in the width direction of the battery cover patch 2.

[0078] Among them, such as Figure 4As shown, in this embodiment, the distance *a* between the first outer edge 221 and the fifth outer edge 241 along the length direction of the battery cover patch 2, and the distance *b* between the second outer edge 222 and the sixth outer edge 242 along the length direction of the battery cover patch 2 are all greater than or equal to 3 mm. Similarly, the distance *c* between the third outer edge 223 and the seventh outer edge 243 along the width direction of the battery cover patch 2, and the distance *d* between the fourth outer edge 224 and the eighth outer edge 244 along the width direction of the battery cover patch 2 are all greater than or equal to 3 mm. This embodiment, by specifically quantifying the minimum distance between the edge of the first hollow portion 24 and the edge of the adhesive layer 22, ensures that the adhesive layer 22 has sufficient width to form an effective adhesive strength band, effectively resisting peel stress, enhancing the anti-warping and anti-detachment ability of the battery cover patch 2 during long-term use, and guaranteeing the long-term stability and reliability of the product.

[0079] In other alternative embodiments, the spacing between the edge of the first cutout portion 24 and the edge of the corresponding adhesive layer 22 can also be designed to other values ​​according to actual needs. Alternatively, one edge of the first cutout portion 24 can extend directly to the edge of the adhesive layer 22.

[0080] Furthermore, such as Figure 1 and Figure 4 As shown, in this embodiment, the first cutout portion 24 is located between the terminal post avoidance area 251 and the explosion-proof valve avoidance area 252 in the length direction of the battery cover patch 2. The fifth outer edge 241 of the first cutout portion 24 and the end of the terminal post avoidance area 251 facing the first cutout portion 24, and the sixth outer edge 242 of the first cutout portion 24 and the end of the explosion-proof valve avoidance area 252 facing the first cutout portion 24, are spaced apart in the length direction of the battery cover patch 2 to ensure that the adhesive layer 22 has sufficient edge bonding area, to ensure the overall adhesion and sealing reliability of the battery cover patch 2, and to prevent the battery cover patch 2 from lifting or falling off.

[0081] In this embodiment, the distance e between the fifth outer edge 241 of the first hollow portion 24 and the end of the electrode clearance area 251 facing the first hollow portion 24 along the length of the battery cover patch 2, and the distance f between the sixth outer edge 242 of the first hollow portion 24 and the end of the explosion-proof valve clearance area 252 facing the first hollow portion 24 along the length of the battery cover patch 2, are both greater than or equal to 3mm. This embodiment, by specifically quantifying the minimum distance between the edge of the first hollow portion 24 and the edge of the second hollow portion 25, ensures that the adhesive layer 22 has sufficient width to form an effective adhesive strength band, effectively resisting peel stress, enhancing the anti-warping and anti-detachment ability of the battery cover patch 2 during long-term use, and ensuring the long-term stability and reliability of the product.

[0082] In other alternative embodiments, the distance between the edge of the first cutout portion 24 and the edge of the adjacent second cutout portion 25 on the corresponding side can also be designed to other values ​​according to actual needs. Alternatively, one edge of the first cutout portion 24 can extend directly to the edge of the adjacent second cutout portion 25 on the corresponding side.

[0083] In other alternative embodiments, the first cutout portion 24 may also be disposed between one end of the adhesive layer 22 in the length direction of the battery cover plate patch 2 and the second cutout portion 25. In this state, there is a gap between the end of the first cutout portion 24 facing the second cutout portion 25 in the length direction of the battery cover plate patch 2 and the adjacent second cutout portion 25. Preferably, the distance between both ends of the first cutout portion 24 in the length direction of the battery cover plate patch 2 and the corresponding end of the adhesive layer 22 in the length direction of the battery cover plate patch 2 and the adjacent second cutout portion 25 is greater than or equal to 3mm.

[0084] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship of the device or component shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0085] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A battery cover patch, comprising an insulating layer (21) and an adhesive layer (22), wherein the adhesive layer (22) is connected to one end face of the insulating layer (21) in the thickness direction of the battery cover patch (2), characterized in that, The battery cover patch (2) includes a first cutout portion (24), which penetrates the adhesive layer (22) at both ends in the thickness direction of the battery cover patch (2). The projection of the first cutout portion (24) toward the insulating layer (21) along the thickness direction of the battery cover patch (2) overlaps with the body of the insulating layer (21). The first cutout portion (24) is used to cover the first product identification portion (13) of the battery cover.

2. The battery cover patch as described in claim 1, characterized in that, The projection of the first cutout portion (24) toward the insulating layer (21) along the thickness direction of the battery cover patch (2) is located on the body of the insulating layer (21); the first cutout portion (24) has a gap between its two ends in the length direction of the battery cover patch (2) and the corresponding two ends of the adhesive layer (22) in the length direction of the battery cover patch (2); the first cutout portion (24) has a gap between its two ends in the width direction of the battery cover patch (2) and the corresponding two ends of the adhesive layer (22) in the width direction of the battery cover patch (2).

3. The battery cover patch as described in claim 2, characterized in that, The battery cover patch (2) satisfies one or more of the following conditions: a1. The distance between the two ends of the first hollow part (24) in the length direction of the battery cover patch (2) and the two ends of the adhesive layer (22) in the length direction of the battery cover patch (2) is greater than or equal to 3mm. b1. The distance between the two ends of the first hollow part (24) in the width direction of the battery cover patch (2) and the two ends of the adhesive layer (22) in the width direction of the battery cover patch (2) is greater than or equal to 3mm.

4. The battery cover patch as described in claim 2, characterized in that, The battery cover patch (2) further includes a plurality of second cutouts (25), which are spaced apart along the length of the battery cover patch (2). The two ends of the second cutouts (25) penetrate the insulating layer (21) and the adhesive layer (22) in the thickness direction of the battery cover patch (2). The battery cover patch (2) meets one of the following conditions: a2. The first cutout portion (24) is disposed between two adjacent second cutout portions (25) in the length direction of the battery cover plate patch (2), and the first cutout portion (24) has a gap between its two ends in the length direction of the battery cover plate patch (2) and the adjacent second cutout portions (25) on the corresponding side. b2. The first cutout portion (24) is disposed between one end of the adhesive layer (22) in the length direction of the battery cover patch (2) and the second cutout portion (25). The first cutout portion (24) has a gap between the end of the first cutout portion (24) facing the second cutout portion (25) in the length direction of the battery cover patch (2) and the adjacent second cutout portion (25).

5. The battery cover patch as described in claim 4, characterized in that, When the first cutout (24) is located between two adjacent second cutouts (25) in the length direction of the battery cover patch (2), the distance between the two ends of the first cutout (24) in the length direction of the battery cover patch (2) and the adjacent second cutouts (25) on the corresponding side is greater than or equal to 3mm. When the first cutout (24) is located between one end of the adhesive layer (22) in the length direction of the battery cover patch (2) and the second cutout (25), the distance between the two ends of the first cutout (24) in the length direction of the battery cover patch (2) and the corresponding end of the adhesive layer (22) in the length direction of the battery cover patch (2) and the adjacent second cutout (25) is greater than or equal to 3mm.

6. The battery cover patch as described in any one of claims 2-5, characterized in that, The first hollow part (24) has a rectangular cross-section.

7. The battery cover patch as described in claim 1, characterized in that, The adhesive layer (22) is a backing adhesive fixed on the insulating layer (21). The battery cover patch (2) also includes release paper (23), which is connected to the end of the adhesive layer (22) away from the insulating layer (21) in the thickness direction of the battery cover patch (2).

8. A secondary battery, characterized in that, The secondary battery includes a battery cover plate (1) and a battery cover plate patch (2) as described in any one of claims 1-7. The battery cover (1) is provided with a first product identification part (13), and the first hollow part (24) of the battery cover patch (2) covers the first product identification part (13).

9. The secondary battery as described in claim 8, characterized in that, The first product identification part (13) includes a graphic code (131), and the projection of the graphic code (131) toward the adhesive layer (22) along the thickness direction of the battery cover patch (2) is located in the first hollow part (24).

10. The secondary battery as described in claim 9, characterized in that, The first product identification part (13) further includes a text recognition structure (132), which is located outside the graphic code. The projection of the text recognition structure toward the adhesive layer (22) along the thickness direction of the battery cover patch (2) is located within the first hollow part (24).

Images