A puncture-resistant battery

Abstract

This utility model discloses a puncture-resistant battery, belonging to the field of battery technology. The puncture-resistant battery includes a square casing and an insulating film. The insulating film includes a substrate layer and an adhesive layer. The adhesive layer includes a first adhesive layer, an aramid fiber layer, and a second adhesive layer stacked sequentially. The second adhesive layer is used to bond to the outer surface of the square casing, and the first adhesive layer is bonded between the substrate layer and the aramid fiber layer. This puncture-resistant battery can improve the puncture resistance of the entire insulating film through the aramid fiber layer with good puncture resistance, and the first and second adhesive layers with buffering and absorption effects, thereby improving the insulation protection performance of the entire puncture-resistant battery and increasing the overall coating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a puncture-resistant battery. Background Technology

[0002] An insulating film is usually required to cover the outer surface of the casing of a square battery to provide insulation protection for the battery, prevent short circuits caused by electrical connection between the battery and other metal structures, and ensure the safety of the battery.

[0003] Current insulating films typically consist of a substrate layer and an adhesive layer, with the substrate layer adhering to the outer surface of the casing via the adhesive layer. However, the adhesive layer is easily scratched or even punctured, which affects the insulation protection of the prismatic battery. Therefore, in actual production, it is necessary to perform surface inspection on the prismatic batteries after they are coated with insulating film to remove those with scratches or punctures, and then rework the entire prismatic battery. During rework, the insulating film needs to be removed first, and then the outer surface of the casing needs to be re-coated with a complete insulating film. This rework process, in turn, affects the coating efficiency of the prismatic battery.

[0004] To address the above problems, there is an urgent need for a puncture-resistant battery. Utility Model Content

[0005] The purpose of this invention is to provide a puncture-resistant battery that can improve the puncture resistance of the insulating film, thereby improving the insulation protection performance of the entire puncture-resistant battery and increasing the overall coating efficiency of the puncture-resistant battery.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A puncture-resistant battery, comprising:

[0008] Square shell;

[0009] An insulating film includes a substrate layer and an adhesive layer. The adhesive layer includes a first adhesive layer, an aramid fiber layer, and a second adhesive layer stacked sequentially. The second adhesive layer is used to bond to the outer surface of the square housing, and the first adhesive layer is bonded between the substrate layer and the aramid fiber layer.

[0010] As an optional solution, the thickness of each of the aramid fiber layers is less than the thickness of the substrate layer, the thickness of the first adhesive layer, and the thickness of the second adhesive layer.

[0011] As an optional feature, the thickness of the aramid fiber layer is 5μm to 10μm.

[0012] As an optional solution, the thickness of the substrate layer is 30μm to 35μm.

[0013] As an optional solution, the thickness of both the first adhesive layer and the second adhesive layer is 35μm to 40μm.

[0014] Alternatively, the lengths of the substrate layer, the first adhesive layer, the aramid fiber layer, and the second adhesive layer are all equal.

[0015] The widths of the substrate layer, the first adhesive layer, the aramid fiber layer, and the second adhesive layer are all equal.

[0016] Alternatively, the outer surface of the square shell can be roughened.

[0017] As an optional feature, the puncture-resistant battery further includes:

[0018] The battery cell is housed within the square casing;

[0019] A top cover and a sealing cover are provided at the open top of the square housing. The insulating film, which is adhered to the outer surface of the square housing, extends upward along the Z-axis to the top cover, and the portion of the insulating film extending above the top cover is bent and adhered to the upper surface of the top cover.

[0020] As an optional feature, the puncture-resistant battery further includes:

[0021] An insulating sheet, a portion of which is adhered to the upper surface of the top cover, and another portion of which is adhered to the insulating film that is bent and adhered to the upper surface of the top cover.

[0022] As an optional solution, the width of the insulating film bent and bonded to the upper surface of the top cover is 4mm to 6mm.

[0023] The beneficial effects of this utility model are as follows:

[0024] By comprising an insulating film including a substrate layer and an adhesive layer, and the adhesive layer comprising a first adhesive layer, an aramid fiber layer, and a second adhesive layer stacked sequentially, the second adhesive layer is used to bond to the outer surface of the square casing, and the first adhesive layer is bonded between the substrate layer and the aramid fiber layer; since aramid fiber material has strong wear resistance and puncture resistance, the aramid fiber layer formed by aramid fiber material can greatly improve the puncture resistance of the entire insulating film even when the thickness is relatively thin, so as to avoid scratching or even puncturing the aramid fiber layer when subjected to external impact, thereby providing better protection for the square casing and preventing puncture of the square casing, thus greatly improving the insulation protection performance of the entire puncture-proof battery; and, it can greatly reduce the probability of the insulating film with scratch or even puncture defects, thereby reducing the number of rework operations for the entire puncture-proof battery with defects, and greatly improving the coating efficiency of the entire puncture-proof battery. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the puncture-resistant battery (without insulating film) provided in this utility model. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the puncture-resistant battery (covered with an insulating film, but the insulating sheet is not assembled to the top cover) provided in this utility model. Figure 2 ;

[0027] Figure 3 This is a magnified front view of the insulating film provided in this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10-Piercing resistant battery;

[0030] 1-Square shell; 11-Outer surface; 111-Large side; 112-Small side; 113-Bottom end; 2-Insulating film; 21-Substrate layer; 22-Adhesive layer; 221-First adhesive layer; 222-Aramid fiber layer; 223-Second adhesive layer;

[0031] 3-Top cover; 4-Insulating sheet. Detailed Implementation

[0032] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0033] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0034] 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.

[0035] Currently, insulating films typically consist of a substrate layer and an adhesive layer. The substrate layer is adhered to the outer surface of the prismatic battery casing via the adhesive layer. However, the adhesive layer is easily scratched or even punctured, which affects the insulation protection of the prismatic battery. Therefore, in actual production, it is necessary to perform surface inspection on the prismatic batteries after they are coated with insulating films to remove those with scratches or punctures, and then rework the entire prismatic battery. During rework, the insulating film needs to be removed first, and then the outer surface of the casing needs to be re-coated with a complete insulating film. This rework process, in turn, affects the coating efficiency of the prismatic battery.

[0036] Therefore, such as Figure 1 and Figure 2 As shown, this embodiment proposes a puncture-resistant battery 10, which has good puncture resistance, thereby improving the overall insulation protection performance of the puncture-resistant battery 10 and increasing the overall encapsulation efficiency. Specifically, the puncture-resistant battery 10 involved in this embodiment can be a square aluminum-cased battery. Here, the specific type of puncture-resistant battery 10 is not limited.

[0037] It is worth noting that the main improvement in this embodiment lies in the insulating protective structure of the puncture-resistant battery 10. Here, the specific working principle of the puncture-resistant battery 10 will not be described in detail, but can be referred to the working principle of existing batteries.

[0038] Specifically, such as Figures 1 to 3 As shown, the puncture-resistant battery 10 includes a square casing 1 and an insulating film 2. The insulating film 2 includes a substrate layer 21 and an adhesive layer 22. The adhesive layer 22 includes a first adhesive layer 221, an aramid fiber layer 222, and a second adhesive layer 223 stacked sequentially. The second adhesive layer 223 is used to bond to the outer surface 11 of the square casing 1, enabling the entire insulating film 2 to be bonded and covered on the square casing 1. The first adhesive layer 221 is bonded between the substrate layer 21 and the aramid fiber layer 222, enabling effective bonding between the substrate layer 21 and the aramid fiber layer 222. Specifically, the outer surface 11 of the square casing 1 in this embodiment includes a bottom end face 113, two opposing large side faces 111, and two opposing small side faces 112. The square casing 1 can specifically be a square aluminum casing.

[0039] The puncture-resistant battery 10 in this embodiment differs from the prior art in that the specific structure of the adhesive layer 22 is modified. The insulating film 2 includes a substrate layer 21 and an adhesive layer 22, and the adhesive layer 22 includes a first adhesive layer 221, an aramid fiber layer 222, and a second adhesive layer 223 stacked sequentially. The second adhesive layer 223 is used to bond to the outer surface 11 of the square housing 1, and the first adhesive layer 221 is bonded between the substrate layer 21 and the aramid fiber layer 222. Because aramid fiber material has strong wear resistance and puncture resistance, the aramid fiber layer 222 formed from aramid fiber material is... Even with a relatively thin film, the puncture resistance of the entire insulating film 2 can be greatly improved, so as to avoid scratching or even puncturing the aramid fiber layer 222 when subjected to external impact. This can provide better protection for the square shell 1 and prevent puncture of the square shell 1, thereby greatly improving the insulation protection performance of the entire puncture-resistant battery 10. Furthermore, it can greatly reduce the probability of the insulating film 2 having scratches or even puncture defects, thereby reducing the number of rework operations for the entire puncture-resistant battery 10 with defects, and greatly improving the coating efficiency of the entire puncture-resistant battery 10.

[0040] And, as Figure 3 As shown, by setting two layers, the first adhesive layer 221 and the second adhesive layer 223, the bonding strength of the entire insulating film 2 can be better guaranteed, thereby ensuring effective adhesion between the substrate layer 21 and the outer surface 11 of the square shell 1. Furthermore, the two adhesive layers 221 and 223 improve the buffering performance of the entire insulating film 2. When the substrate layer 21 is subjected to impact, the first adhesive layer 221 and the second adhesive layer 223 can provide a certain buffering and absorption effect, making the entire insulating film 2 less prone to being scratched or punctured, thus improving its puncture resistance. The first adhesive layer 221 and the second adhesive layer 223 can employ common adhesive structures found in existing technologies.

[0041] Furthermore, such as Figure 3 As shown, the thickness of the aramid fiber layer 222 is less than the thickness of the substrate layer 21, the thickness of the first adhesive layer 221, and the thickness of the second adhesive layer 223. This arrangement has two advantages: First, the thinner aramid fiber layer 222 has better flexibility, which makes the entire insulating film 2 more flexible and facilitates the smooth bonding and covering of the insulating film 2 onto the outer surface 11 of the square shell 1. It can also effectively cover the corners where different sides of the square shell 1 meet, making it less prone to lifting. Second, the slightly thicker substrate layer 21, the first adhesive layer 221, and the second adhesive layer 223 ensure that the structural hardness of the entire insulating film 2 is more suitable, thereby ensuring the bonding stability of the entire insulating film 2 on the outer surface 11 of the square shell 1.

[0042] Specifically, the thickness of the aramid fiber layer 222 is 5μm to 10μm to ensure that the aramid fiber layer 222 is relatively thin. Furthermore, due to the good flexibility of the aramid fiber layer 222 itself, the overall flexibility of the insulating film 2 can be better guaranteed. In this embodiment, the specific thickness of the aramid fiber layer 222 can be 8μm. Here, the specific thickness of the aramid fiber layer 222 is not limited, as long as the thickness of the aramid fiber layer 222 is within the range of 5μm to 10μm.

[0043] Furthermore, the thickness of the substrate layer 21 is 30μm to 35μm to ensure a suitable thickness. This avoids the substrate layer 21 being too thick, which would affect the overall flexibility of the insulating film 2, thus better guaranteeing its flexibility. Conversely, it avoids the substrate layer 21 being too thin, which would affect the structural rigidity of the insulating film 2, thus ensuring a suitable structural rigidity. In this embodiment, the substrate layer 21 can specifically be made of polyethylene terephthalate (PET), which possesses excellent structural rigidity and electrical insulation properties.

[0044] In this embodiment, the specific thickness of the substrate layer 21 can be 35μm. Here, the specific thickness of the substrate layer 21 is not limited, as long as the thickness of the substrate layer 21 is between 30μm and 35μm.

[0045] Specifically, the thickness of both the first adhesive layer 221 and the second adhesive layer 223 is 35μm to 40μm, so that the thickness of the first adhesive layer 221 and the second adhesive layer 223 is more suitable. On the one hand, it can avoid the first adhesive layer 221 and the second adhesive layer 223 being too thick, which would affect the flexibility of the entire insulating film 2, and better ensure the flexibility of the entire insulating film 2. Moreover, it can avoid the insulating film 2 from wrinkling easily during the coating process due to the first adhesive layer 221 and the second adhesive layer 223 being too thick, and better ensure the coating effect of the insulating film 2 on the outer surface 11 of the square shell 1. On the other hand, it can avoid the first adhesive layer 221 and the second adhesive layer 223 being too thin, which would affect the structural hardness of the entire insulating film 2, and thus better ensure that the structural hardness of the entire insulating film 2 is more suitable. At the same time, it can ensure that the first adhesive layer 221 and the second adhesive layer 223 have a good buffer absorption effect, and better ensure that the entire insulating film 2 is less likely to be scratched or punctured.

[0046] Furthermore, since the thickness of the first adhesive layer 221 and the second adhesive layer 223 is relatively suitable, when the insulating film 2 is bent and wrapped at the corner between two adjacent faces of the square shell 1, the first adhesive layer 221 and the second adhesive layer 223 can produce elastic deformation to absorb the wrinkles generated by the entire insulating film 2 during the bending and wrapping process, so that the insulating film 2 is not easy to wrinkle at the corner, further ensuring the wrapping effect of the insulating film 2 on the outer surface 11 of the square shell 1.

[0047] In this embodiment, the specific thickness of the first adhesive layer 221 and the second adhesive layer 223 can both be 40μm. Here, the specific thickness of the first adhesive layer 221 and the second adhesive layer 223 is not limited, as long as the thickness of the first adhesive layer 221 and the second adhesive layer 223 is between 35μm and 40μm.

[0048] Furthermore, such as Figure 3 As shown, the lengths of the substrate layer 21, the first adhesive layer 221, the aramid fiber layer 222, and the second adhesive layer 223 are all equal; and the widths of the substrate layer 21, the first adhesive layer 221, the aramid fiber layer 222, and the second adhesive layer 223 are all equal. This ensures that the aramid fiber layer 222 can fully cover all positions of the substrate layer 21, the first adhesive layer 221, and the second adhesive layer 223, thereby ensuring the puncture resistance of the insulating film 2 at all positions and preventing punctures at positions where the aramid fiber layer 222 is not provided. This ensures the comprehensive coverage of the puncture resistance of the entire insulating film 2.

[0049] Specifically, the outer surface 11 of the square shell 1 is set as a rough surface. That is, the roughness of the outer surface 11 of the square shell 1 can be improved by setting an anti-slip pattern structure or other rough structure on the outer surface 11 of the square shell 1. This can increase the adhesive friction between the second adhesive layer 223 and the outer surface 11 of the square shell 1, thereby improving the bonding effect between the insulating film 2 and the square shell 1, and thus ensuring the stability and reliability of the bonding between the insulating film 2 and the square shell 1.

[0050] Furthermore, such as Figure 2 As shown, the puncture-resistant battery 10 also includes a battery cell and a top cover 3; wherein, the battery cell is disposed within the square housing 1; the top cover 3 is a sealing cap located at the open top of the square housing 1, so as to encapsulate the battery cell within the square housing 1, thereby providing protection for the battery cell. The battery cell and top cover 3 are common structures in existing batteries; therefore, the specific structure and working principle of the battery cell and top cover 3 will not be described in detail here.

[0051] Specifically, the insulating film 2 adhered to the outer surface 11 of the square housing 1 refers to the insulating film 2 adhered to the large side 111 and small side 112 of the square housing 1, extending upward along the Z-axis to the top cover 3. The portion of the insulating film 2 extending above the top cover 3 is bent and adhered to the upper surface of the top cover 3. This ensures better insulation of the corners of the square housing 1 through the insulating film 2, thereby improving the overall coverage of the puncture resistance of the entire puncture-resistant battery 10.

[0052] Furthermore, such as Figure 1 and Figure 2 As shown, the puncture-resistant battery 10 also includes an insulating sheet 4. A portion of the insulating sheet 4 is adhered to the upper surface of the top cover 3, and another portion of the insulating sheet 4 is adhered to the insulating film 2 that is bent and adhered to the upper surface of the top cover 3, so that the insulating sheet 4 can ensure the insulating coverage of the top cover 3. The insulating sheet 4 can adopt the insulation structure commonly used in existing batteries.

[0053] By attaching a portion of the insulating sheet 4 to the upper surface of the top cover 3 and attaching the other portion of the insulating sheet 4 to the insulating film 2 that is bent and attached to the upper surface of the top cover 3, on the one hand, the insulating sheet 4 can ensure the insulating covering effect of the top cover 3; on the other hand, the adhesive action of the insulating sheet 4 on the insulating film 2 can prevent the insulating film 2 from easily lifting off the top cover 3, thereby ensuring that the insulating film 2 can be attached to the upper surface of the top cover 3 relatively flat and stable.

[0054] Specifically, in this embodiment, the insulating film 2 is bent and bonded to the upper surface of the top cover 3. Specifically, the second adhesive layer 223 is bent and bonded to the upper surface of the top cover 3, and the aramid fiber layer 222, the first adhesive layer 221, and the substrate layer 21 need to be bent synchronously with the second adhesive layer 223. Correspondingly, in this embodiment, another part of the insulating sheet 4 is bonded to the insulating film 2 bent and bonded to the upper surface of the top cover 3. Specifically, the insulating sheet 4 is bonded to the bent substrate layer 21.

[0055] Furthermore, the width of the insulating film 2 bent and bonded to the upper surface of the top cover 3 is 4mm to 6mm, which makes the width of the insulating film 2 bent and bonded to the upper surface of the top cover 3 more suitable. On the one hand, it can avoid the problem that the insulating film 2 is easy to lift off the top cover 3 due to the width of the insulating film 2 bent and bonded to the upper surface of the top cover 3 being too small, and better ensure the bonding stability of the insulating film 2 on the upper surface of the top cover 3. On the other hand, it can avoid the problem that the width of the insulating film 2 bent and bonded to the upper surface of the top cover 3 is too large, which would affect the bonding area between the insulating sheet 4 and the top cover 3. This can avoid the insulating sheet 4 bulging upward relative to the top cover 3 due to the bonding area between the insulating sheet 4 and the top cover 3 being too small, and thus ensure that the bonding effect between the insulating sheet 4 and the top cover 3 is relatively flat and stable.

[0056] In this embodiment, the puncture-resistant battery 10, by changing the specific structure of the adhesive layer 22, includes a first adhesive layer 221, an aramid fiber layer 222, and a second adhesive layer 223 stacked sequentially. This prevents the aramid fiber layer 222 from being scratched or even punctured when subjected to external impact, and allows the first adhesive layer 221 and the second adhesive layer 223 to provide a certain buffering and absorption effect. This greatly improves the puncture resistance of the insulating film 2, making the entire insulating film 2 less prone to being scratched or punctured, and significantly improves the insulation protection performance and coating efficiency of the entire puncture-resistant battery 10.

[0057] In this embodiment, the puncture-resistant battery 10 has a thickness of 5μm to 10μm for the aramid fiber layer 222, a thickness of 30μm to 35μm for the substrate layer 21, and a thickness of 35μm to 40μm for both the first adhesive layer 221 and the second adhesive layer 223. This ensures both the flexibility of the entire insulating film 2 and the structural strength of the insulating film 2. Furthermore, the elastic deformation absorption effect of the first adhesive layer 221 and the second adhesive layer 223 makes it less prone to wrinkling during coating, thus better ensuring the coating effect of the insulating film 2 on the outer surface 11 of the square shell 1.

[0058] In this embodiment, the puncture-resistant battery 10 is designed so that a portion of the insulating sheet 4 is adhered to the upper surface of the top cover 3, and another portion of the insulating sheet 4 is adhered to the insulating film 2 which is bent and adhered to the upper surface of the top cover 3; and the width of the insulating film 2 bent and adhered to the upper surface of the top cover 3 is 4mm to 6mm; thereby, the problem of the insulating film 2 easily lifting off the top cover 3 can be better avoided, thus ensuring the flat adhesion effect of the insulating film 2 on the upper surface of the top cover 3.

[0059] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A puncture-resistant battery, characterized in that, include: Square shell (1); The insulating film (2) includes a substrate layer (21) and an adhesive layer (22). The adhesive layer (22) includes a first adhesive layer (221), an aramid fiber layer (222), and a second adhesive layer (223) stacked in sequence. The second adhesive layer (223) is used to bond to the outer surface (11) of the square shell (1). The first adhesive layer (221) is bonded between the substrate layer (21) and the aramid fiber layer (222).

2. The puncture-resistant battery as described in claim 1, characterized in that, The thickness of each aramid fiber layer (222) is less than the thickness of the substrate layer (21), the thickness of the first adhesive layer (221), and the thickness of the second adhesive layer (223).

3. The puncture-resistant battery as described in claim 2, characterized in that, The thickness of the aramid fiber layer (222) is 5μm to 10μm.

4. The puncture-resistant battery as described in claim 2, characterized in that, The thickness of the substrate layer (21) is 30μm to 35μm.

5. The puncture-resistant battery as described in claim 2, characterized in that, The thickness of the first adhesive layer (221) and the second adhesive layer (223) is 35μm to 40μm.

6. The puncture-resistant battery as described in any one of claims 1-5, characterized in that, The lengths of the substrate layer (21), the first adhesive layer (221), the aramid fiber layer (222), and the second adhesive layer (223) are all equal. The widths of the substrate layer (21), the first adhesive layer (221), the aramid fiber layer (222), and the second adhesive layer (223) are all equal.

7. The puncture-resistant battery as described in any one of claims 1-5, characterized in that, The outer surface (11) of the square shell (1) is set as a rough surface.

8. The puncture-resistant battery as described in any one of claims 1-5, characterized in that, The puncture-resistant battery also includes: The battery cell is disposed inside the square housing (1); The top cover (3) is a sealing cover located at the top of the open end of the square shell (1). The insulating film (2) which is bonded to the outer surface (11) of the square shell (1) extends upward along the Z-axis to the top cover (3), and the portion of the insulating film (2) extending above the top cover (3) is bent and bonded to the upper surface of the top cover (3).

9. The puncture-resistant battery as described in claim 8, characterized in that, The puncture-resistant battery also includes: An insulating sheet (4) is attached to the upper surface of the top cover (3), and another part of the insulating sheet (4) is attached to the insulating film (2) which is bent and attached to the upper surface of the top cover (3).

10. The puncture-resistant battery as described in claim 9, characterized in that, The width of the insulating film (2) bent and bonded to the upper surface of the top cover (3) is 4mm to 6mm.

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