Battery blue film and battery
By designing raised and recessed areas on the battery blue film adhesive layer and combining them with a hot-pressing process, the problems of air bubbles and residual adhesive during the battery blue film coating process were solved, thus improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU QINGTAO NEW ENERGY TECH CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-08
AI Technical Summary
During the battery coating process, air bubbles or bulges are prone to occur, and large areas of adhesive residue are easily generated after the film is peeled off, which affects production efficiency.
Design a battery blue film with multiple raised areas and interconnected grooves on its adhesive layer. The raised areas and grooves are fused together by a hot pressing process to reduce the initial contact area and expel gas, thus ensuring the bonding effect.
This reduces air bubbles and bulges between the battery blue film and the battery body, avoids large areas of residual adhesive, and improves production efficiency.
Smart Images
Figure CN224217563U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a battery blue film and a battery. Background Technology
[0002] Battery blue film is an insulating material typically coated onto the surface of the battery to provide insulation and protection, preventing short circuits between the battery and adjacent batteries or other metal structures, thus ensuring battery safety. Battery blue film usually consists of a substrate layer and an adhesive layer. The substrate layer is insulating, while the adhesive layer has strong adhesion, allowing the substrate layer to adhere to the battery surface. However, in current battery blue film coating processes, poor application can lead to air bubbles or bulges between the battery and the blue film, requiring re-removal and rework. After re-removal, large areas of residual adhesive are often left on the battery surface, requiring cleaning before re-application, thus impacting production efficiency.
[0003] Therefore, there is an urgent need for a battery blue film and battery to solve the above problems. Utility Model Content
[0004] One objective of this invention is to provide a battery blue film that, when used to coat the battery body, reduces the generation of air bubbles or bulges between the battery body and the battery blue film. Furthermore, when rework is required, it avoids the generation of large areas of residual adhesive on the surface of the battery body, while ensuring the adhesion between the battery blue film and the battery body and improving production efficiency.
[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:
[0006] A battery blue film is provided, comprising:
[0007] Substrate layer;
[0008] An adhesive layer is attached to one side surface of the substrate layer. The adhesive layer includes a plurality of raised areas, which are arranged in an array to form a groove area between any two adjacent raised areas. The plurality of groove areas are interconnected. In the thickness direction of the battery blue film, the thickness of the raised areas is greater than the thickness of the groove areas.
[0009] The blue film is used to cover the battery body, the adhesive layer abuts against the battery body, and the raised area and the grooved area are uniformly bonded to the battery body by a hot pressing process.
[0010] Optionally, along the thickness direction of the blue film of the battery, the grooved area does not penetrate the adhesive layer, the thickness of the grooved area is D1, the thickness of the raised area is D2, and 4μm≤D2-D1≤10μm.
[0011] Optionally, along the thickness direction of the blue film of the battery, the thickness of the groove region is D1 and 15μm≤D1≤18μm, and the thickness of the protrusion region is D2 and 22μm≤D2≤25μm.
[0012] Optionally, along the thickness direction of the battery blue film, the thickness of the substrate layer is D3 and 85μm≤D3≤90μm, and the thickness of the battery blue film after hot pressing is D4 and 108μm≤D4≤112μm.
[0013] Optionally, the area of each of the protruding regions projected onto the substrate layer along the thickness direction of the battery blue film is S and 0.1 mm. 2 ≤S≤1mm 2 The width of the groove area is L and 0.1mm≤L≤0.5mm.
[0014] Optionally, the shape of the raised area is an equilateral polygon.
[0015] Optionally, the shape of the raised area is an equilateral triangle, a square, or a rhombus.
[0016] Optionally, the battery blue film includes a first heating zone and a second heating zone arranged from the center outwards.
[0017] Optionally, the battery blue film includes a first heating zone and a second heating zone distributed sequentially from one end to the other.
[0018] Another objective of this invention is to provide a battery that, when the battery body is coated with a blue film, can reduce the generation of air bubbles or bulges between the battery body and the blue film, and can also avoid the generation of large areas of residual adhesive on the surface of the battery body when re-removing the film for rework, while ensuring the adhesion effect between the blue film and the battery body and improving production efficiency.
[0019] Based on the above concept, the technical solution adopted by this utility model is as follows:
[0020] A battery is provided, comprising a battery body and the aforementioned blue film, wherein the blue film covers the battery body and is bonded and fixed to the battery body.
[0021] The beneficial effects of this utility model are as follows:
[0022] The battery blue film proposed in this utility model includes a substrate layer and an adhesive layer. The adhesive layer is attached to one side surface of the substrate layer and includes multiple raised areas arranged in an array to form a groove area between any two adjacent raised areas. The multiple groove areas are interconnected. In the thickness direction of the battery blue film, the thickness of the raised areas is greater than the thickness of the groove areas. When the battery body is covered with the blue film, the adhesive layer abuts against the battery body. Because the thickness of the raised areas in the thickness direction of the battery blue film is greater than the thickness of the groove areas, only the raised areas contact the battery body first during initial contact. This reduces the contact area between the battery blue film and the battery during initial adhesion. Even if the adhesion is not good, it is not easy to leave adhesive residue after the film is removed, making it easy to adjust. After the battery blue film is properly applied, the adhesive layer of the battery blue film can be completely adhered to the surface of the battery body through a hot pressing process. That is, under the hot pressing process, the raised areas and groove areas of the adhesive layer can be fused together to form a flat surface, thereby ensuring the adhesion effect of the battery blue film on the battery body. In addition, the interconnected grooves on the battery blue film facilitate the release of gas between the battery blue film and the battery body when the battery blue film covers the battery body, reducing bulging between the battery blue film and the battery body and improving production efficiency.
[0023] The battery proposed in this utility model includes a battery body and the aforementioned blue film. The blue film covers the surface of the battery body and is bonded and fixed to the battery body. In specific implementation, because the adhesive layer of the blue film has raised and recessed areas, when the blue film covers the surface of the battery body, the raised areas first adhere to the surface of the battery body, reducing the contact area during initial adhesion. Even if the adhesion is not perfect, it is less likely to leave adhesive residue after removal, facilitating adjustment. Once the blue film is properly applied, a hot-pressing process can completely bond the adhesive layer of the blue film to the surface of the battery body. Under hot-pressing, the raised and recessed areas of the adhesive layer fuse together to form a smooth surface, ensuring effective adhesion of the blue film to the battery body. Furthermore, the interconnected recessed areas on the blue film facilitate the release of gas between the blue film and the battery body when the blue film covers the battery body, reducing bulging and improving production efficiency. Attached Figure Description
[0024] Figure 1 This is a front view of the first type of battery blue film provided in this embodiment of the utility model;
[0025] Figure 2 This is a front view of the second type of battery blue film provided in this embodiment of the utility model;
[0026] Figure 3 This is a front view of the third type of battery blue film provided in this embodiment of the utility model;
[0027] Figure 4This is a side view of the battery blue film provided in an embodiment of the present invention;
[0028] Figure 5 yes Figure 4 Enlarged view of point A in the middle;
[0029] Figure 6 A schematic diagram of a partitioned battery blue film provided in an embodiment of this utility model;
[0030] Figure 7 Another partitioning diagram of the battery blue film provided in this embodiment of the present invention.
[0031] In the picture:
[0032] 1. Substrate layer;
[0033] 2. Adhesive layer; 21. Raised area; 22. Groove area;
[0034] 10. First heating zone; 20. Second heating zone. Detailed Implementation
[0035] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0038] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0040] like Figures 1 to 5 As shown, this embodiment provides a battery blue film, including a substrate layer 1 and an adhesive layer 2. The adhesive layer 2 is attached to one side surface of the substrate layer 1. The adhesive layer 2 includes multiple raised areas 21, which are arranged in an array to form a groove area 22 between any two adjacent raised areas 21. The multiple groove areas 22 are interconnected. In the thickness direction of the battery blue film, the thickness of the raised areas 21 is greater than the thickness of the groove areas 22. Therefore, when the battery body is covered with the blue film, the adhesive layer 2 abuts against the battery body. Because the thickness of the raised areas 21 in the thickness direction of the battery blue film is greater than the thickness of the groove areas 22, only the raised areas 21 contact the battery body first during initial contact. This reduces the contact area between the battery blue film and the battery during initial adhesion. Even if the adhesion is poor, it is not easy to leave adhesive residue after peeling off the film, making adjustment convenient. Once the blue film is applied, a hot-pressing process completely adheres the adhesive layer 2 of the blue film to the surface of the battery body. This hot-pressing process fuses the raised areas 21 and recessed areas 22 of the adhesive layer 2 together, forming a smooth surface and ensuring effective adhesion of the blue film to the battery body. Furthermore, the interconnected recessed areas 22 on the blue film facilitate the release of gas between the blue film and the battery body during the wrapping process, reducing bulging and improving production efficiency.
[0041] Optionally, the hot-pressing temperature of the hot-pressing process is T, where 80℃≤T≤90℃; the hot-pressing pressure is P, where 4MPa≤P≤5MPa; and the hot-pressing time is H, where 10s≤H≤60s. In specific implementations, the hot-pressing temperature, hot-pressing pressure, and hot-pressing time can be adjusted according to the length, width, and thickness of the adhesive layer 2 of the battery blue film. If the area of the battery body increases, the size of the battery blue film will increase accordingly, and the thickness of the adhesive layer 2 may also be adjusted.
[0042] In this embodiment, the materials of the substrate layer 1 and the adhesive layer 2 of the battery blue film can be the existing materials of the substrate and adhesive of the battery blue film, which will not be described in detail here.
[0043] In this embodiment, along the thickness direction of the battery blue film, the groove area 22 does not penetrate the adhesive layer 2. The thickness of the groove area 22 is D1, and the thickness of the raised area 21 is D2, where 4μm≤D2-D1≤10μm. The thickness difference between the groove area 22 and the raised area 21 in the thickness direction of the battery blue film is used to ensure that only the raised area 21 adheres to the surface of the battery body initially when the battery blue film is applied to the battery body, thereby reducing the contact area between the adhesive layer 2 and the battery body. Furthermore, after the battery blue film is hot-pressed, the adhesive layer 2 of the raised area 21 can partially flow to the groove area 22 to completely fill the groove area 22.
[0044] In other embodiments, the groove area 22 may also penetrate the adhesive layer 2 along the thickness direction of the battery blue film. Under this arrangement, although it can be ensured that only the raised area 21 adheres to the surface of the battery body in the initial stage of the battery blue film being applied to the battery body, thus reducing the contact area between the adhesive layer 2 and the battery body, it is difficult to guarantee that the raised area 21 will completely fill the groove area 22 after hot pressing. That is, it may cause gaps between the adhesive layer 2 and the surface of the battery body, thereby affecting the adhesion between the battery blue film and the surface of the battery body, that is, the adhesion effect between the battery blue film and the battery body will be affected.
[0045] In this embodiment, along the thickness direction of the battery blue film, the thickness of the groove area 22 is D1 and 15μm≤D1≤18μm, and the thickness of the raised area 21 is D2 and 22μm≤D2≤25μm. Within this range, the thickness difference between the groove area 22 and the raised area 21 can be effectively guaranteed to ensure that only the raised area 21 adheres to the surface of the battery body initially when the battery blue film is applied to the battery body, thereby reducing the contact area between the adhesive layer 2 and the battery body. At the same time, after the battery blue film is hot-pressed, the adhesive layer 2 of the raised area 21 can partially flow to the groove area 22 to completely fill the groove area 22. In addition, the thickness setting of the adhesive layer 2 can ensure the adhesion effect between the battery blue film and the surface of the battery body, ensuring the durability of the battery blue film's coverage of the battery body.
[0046] Optionally, along the thickness direction of the battery blue film, the thickness of the substrate layer 1 is D3 and 85μm≤D3≤90μm, and the thickness of the battery blue film after hot pressing is D4 and 108μm≤D4≤112μm. In this embodiment, the thickness of the substrate layer 1 of the battery blue film is basically the same as the thickness of the substrate of the existing battery blue film, while the thickness of the adhesive of the existing battery blue film is generally 20μm. That is, after the hot pressing process, the thickness of the battery blue film provided in this embodiment is also basically the same as the thickness of the existing battery blue film, and will not affect subsequent battery assembly, etc.
[0047] Furthermore, to ensure the uniformity of fusion between the raised areas 21 and the recessed areas 22 of the adhesive layer 2 after hot pressing, the shape of the raised areas 21 is set as an equilateral polygon. Multiple raised areas 21 are provided on the adhesive layer 2, arranged in an array of multiple equilateral polygons, so that the size of the recessed areas 22 formed between any two adjacent raised areas 21 is also consistent. Therefore, during hot pressing of the battery blue film, the flow characteristics of the adhesive layer 2 allow the raised areas 21 to fill the adjacent recessed areas 22.
[0048] Optionally, such as Figure 1 As shown, the shape of the raised area 21 can be square. Multiple raised areas 21 are arranged in an array, distributed in N rows and M columns. Due to the square shape, each row of raised areas 21 is parallel to the length direction of the adhesive layer 2, and each column of raised areas 21 is parallel to the width direction of the adhesive layer 2. That is, each row of raised areas 21 and each column of raised areas 21 are arranged at a 90° angle. As a result, the formed multi-row groove area 22 and multi-column groove area 22 are also arranged at a 90° angle. Each row or column of groove area 22 is a long groove. The width of the long groove varies according to the distance between two adjacent raised areas 21, and the length of the long groove varies according to the length and width of the adhesive layer 2.
[0049] Preferably, the area of the projection of each square onto the substrate layer 1 along the thickness direction of the battery blue film is S and 0.1 mm. 2 ≤S≤1mm 2 The width of the groove area 22 is L and 0.1mm≤L≤0.5mm. The width of the groove area 22 defined here is the width of the elongated groove.
[0050] Optionally, such as Figure 2 As shown, the shape of the raised area 21 can be an equilateral triangle. Multiple raised areas 21 are arranged in an array, forming N rows and M columns. Each row or column of groove area 22 is an elongated groove. The width of the elongated groove varies according to the distance between two adjacent raised areas 21, and the length of the elongated groove varies according to the length and width of the adhesive layer 2. Preferably, the area of the projection of each equilateral triangle along the thickness direction of the battery blue film onto the substrate layer 1 is S and 0.1 mm. 2≤S≤1mm 2 The width of the groove area 22 is L and 0.1mm≤L≤0.5mm. The width of the groove area 22 defined here is the width of the elongated groove.
[0051] Optionally, such as Figure 3 As shown, the shape of the raised area 21 can be rhomboid. Multiple raised areas 21 are arranged in an array, forming N rows and M columns. Each row or column of groove area 22 is an elongated groove. The width of the elongated groove varies according to the distance between two adjacent raised areas 21, and the length of the elongated groove varies according to the length and width of the adhesive layer 2. Preferably, the area of each rhombus projected onto the substrate layer 1 along the thickness direction of the battery blue film is S and 0.1 mm. 2 ≤S≤1mm 2 The width of the groove area 22 is L and 0.1mm≤L≤0.5mm. The width of the groove area 22 defined here is the width of the elongated groove.
[0052] Optionally, the raised area 21 and the recessed area 22 are formed by rolling with an anilox roller. In a specific implementation, the shape of the recessed area 22 corresponds to the raised structure on the anilox roller. The raised structure on the anilox roller is used to roll the adhesive layer 2 of the battery blue film, thereby forming the recessed area 22 on the adhesive layer 2 that matches the raised structure. According to the material properties of the adhesive layer 2, an appropriate anilox roller temperature is set to avoid the adhesive layer 2 from melting excessively due to excessive temperature, or from not softening sufficiently due to excessively low temperature, both of which will affect the performance of the adhesive layer 2 or the clarity of the shape of the recessed area 22.
[0053] Optionally, such as Figure 6 As shown, the battery blue film includes a first heating zone 10 and a second heating zone 20 arranged from the center outwards. When the adhesive layer 2 of the battery blue film is bonded to the surface of the battery body through a hot-pressing process, the first heating zone 10 is first heated by hot melting, so that the raised area 21 and the groove area 22 of the first heating zone 10 are uniformly adhered to the surface of the battery body. The air originally in the groove area 22 that is first heated and filled in the first heating zone 10 can be discharged along the unfilled groove area 22, so as to avoid the gas in the groove area 22 not being able to be discharged during hot melting filling, thereby affecting the bonding effect between the adhesive layer 2 and the battery body.
[0054] Optionally, such as Figure 7As shown, the battery blue film includes a first heating zone 10 and a second heating zone 20 distributed sequentially from one end to the other. In this configuration, the first heating zone 10 is first subjected to heat-melting heating so that the raised area 21 and the grooved area 22 of the first heating zone 10 are uniformly adhered to the surface of the battery body. This allows the gas in the grooved area 22 of the first heating zone 10 to be discharged from one end of the battery blue film to the other end. Similarly, it avoids the situation where the gas in the grooved area 22 cannot be discharged during heat-melting filling, thus affecting the bonding effect between the adhesive layer 2 and the battery body.
[0055] This embodiment also provides a battery, including a battery body and the aforementioned blue film. The blue film covers the surface of the battery body and is bonded and fixed to the battery body. Specifically, because the adhesive layer 2 of the blue film has raised areas 21 and recessed areas 22, when the blue film covers the surface of the battery body, the raised areas 21 can first bond with the surface of the battery body, reducing the contact area during initial adhesion. Even if the adhesion is poor, it is less likely to leave adhesive residue after removal, facilitating adjustment. Once the blue film is properly applied, a hot-pressing process can completely bond the adhesive layer 2 of the blue film to the surface of the battery body. Under hot-pressing, the raised areas 21 and recessed areas 22 of the adhesive layer 2 can fuse together to form a smooth surface, ensuring effective adhesion of the blue film to the battery body. Furthermore, the interconnected recessed areas 22 on the blue film facilitate the release of gas between the blue film and the battery body when the blue film covers the battery body, reducing bulging and improving production efficiency.
[0056] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A battery blue film, characterized in that, include: Substrate layer (1); Adhesive layer (2) is attached to one side surface of substrate layer (1). The adhesive layer (2) includes a plurality of raised areas (21). The plurality of raised areas (21) are arranged in an array to form a groove area (22) between any two adjacent raised areas (21). The plurality of groove areas (22) are interconnected. In the thickness direction of the battery blue film, the thickness of the raised areas (21) is greater than the thickness of the groove areas (22). The blue film of the battery is used to cover the battery body. The adhesive layer (2) abuts against the battery body. The raised area (21) and the grooved area (22) are uniformly bonded to the battery body by hot pressing process.
2. The battery blue film according to claim 1, characterized in that, Along the thickness direction of the blue film of the battery, the groove area (22) does not penetrate the adhesive layer (2), the thickness of the groove area (22) is D1, the thickness of the protrusion area (21) is D2, and 4μm≤D2-D1≤10μm.
3. The battery blue film according to claim 1, characterized in that, Along the thickness direction of the blue film of the battery, the thickness of the groove region (22) is D1 and 15μm≤D1≤18μm, and the thickness of the protrusion region (21) is D2 and 22μm≤D2≤25μm.
4. The battery blue film according to claim 3, characterized in that, Along the thickness direction of the battery blue film, the thickness of the substrate layer (1) is D3 and 85μm≤D3≤90μm, and the thickness of the battery blue film after hot pressing is D4 and 108μm≤D4≤112μm.
5. The battery blue film according to claim 1, characterized in that, The area of the projection of each of the protruding regions (21) onto the substrate layer (1) along the thickness direction of the battery blue film is S and 0.1 mm. 2 ≤S≤1mm 2 The width of the groove area (22) is L and 0.1mm≤L≤0.5mm.
6. The battery blue film according to claim 1, characterized in that, The protrusion area (21) is an equilateral polygon.
7. The battery blue film according to claim 6, characterized in that, The shape of the raised area (21) is an equilateral triangle, a square or a rhombus.
8. The battery blue film according to claim 1, characterized in that, The battery blue film includes a first heating zone (10) and a second heating zone (20) arranged from the center outwards.
9. The battery blue film according to claim 1, characterized in that, The battery blue film includes a first heating zone (10) and a second heating zone (20) distributed sequentially from one end to the other.
10. A battery, characterized in that, The battery includes a battery body and a battery blue film as described in any one of claims 1 to 9, wherein the battery blue film covers the battery body and is bonded and fixed to the battery body.