Cover plate assembly, housing and battery

Abstract

This utility model relates to the field of batteries, providing a cover assembly, a housing, and a battery. The cover assembly includes a cover body with an explosion-proof valve disposed thereon; and a protective patch covering the explosion-proof valve. The protective patch includes a substrate and an adhesive layer. A notch is formed in the substrate, and a blocking portion is provided in the adhesive layer at a position corresponding to the notch. The notch in the substrate of this cover assembly provides a stable venting channel for the explosion-proof valve, ensuring that the internal pressure of the battery can be released normally through the notch. At the same time, the blocking portion of the adhesive layer prevents electrolyte penetration through a dual mechanism of physical covering and adhesive adsorption. The blocking portion can prevent liquid from migrating upward to the surface of the explosion-proof valve, and the blocking portion completely covers the notch, avoiding protection failure due to installation misalignment.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and provides a cover plate assembly, a housing, and a battery. Background Technology

[0002] With the development of battery technology, battery safety has become increasingly important. To effectively alleviate internal battery pressure and maintain safe battery operation, pressure relief valves play a crucial role in battery design. The main function of a pressure relief valve is to automatically open when the internal pressure of the battery is too high, releasing excess pressure and ensuring that the battery will not explode due to excessive internal pressure. To protect the pressure relief valve from external dust and dirt, thus preventing valve failure, a protective film is usually installed on the upper side of the valve. This protective film consists of a substrate and an adhesive layer, effectively isolating external dirt. However, the substrate surface usually has gaps to ensure that the valve can breathe normally and will not change the valve opening pressure due to excessive sealing.

[0003] However, this design also brings a new problem: electrolyte may seep through the notch from the edge of the explosion-proof valve patch to the top of the explosion-proof valve. This not only affects the battery's permeability but may also cause other safety issues due to the accumulation of electrolyte in this area. Utility Model Content

[0004] This utility model provides a cover plate assembly to solve the defect in related technologies where explosion-proof valves cannot effectively prevent electrolyte penetration.

[0005] This utility model embodiment also provides a housing.

[0006] This utility model embodiment also provides a battery.

[0007] A first aspect of this utility model provides a cover plate assembly, comprising:

[0008] The cover plate body is equipped with an explosion-proof valve;

[0009] A protective patch is provided on the explosion-proof valve, the substrate is disposed away from the explosion-proof valve, and the protective patch is located between the substrate and the explosion-proof valve.

[0010] According to one embodiment of the present invention, the cover plate body is provided with a mounting hole, and the explosion-proof valve and the protective patch are disposed in the mounting hole.

[0011] According to one embodiment of the present invention, the thickness H1 of the shielding part is in the range of 0.05 mm ≤ H1 ≤ 0.2 mm.

[0012] According to one embodiment of the present invention, in a plane parallel to the protective patch, the projected area of ​​the blocking portion is greater than or equal to the projected area of ​​the notch.

[0013] According to one embodiment of the present invention, the thickness H2 of the substrate is in the range of 0.1 mm ≤ H2 ≤ 0.3 mm.

[0014] According to one embodiment of the present invention, the thickness H3 of the adhesive layer is in the range of 0.05 mm ≤ H3 ≤ 0.2 mm.

[0015] According to one embodiment of the present invention, the shielding part is integrally formed with the adhesive layer.

[0016] According to one embodiment of the present invention, there are at least two notches, and the at least two notches are symmetrically arranged around the center of the substrate, with the blocking portion corresponding to each notch.

[0017] A second aspect of this utility model provides a housing, including the cover plate assembly as described above.

[0018] A third aspect of this utility model provides a battery, including the cover plate assembly as described above;

[0019] Or a casing as described above.

[0020] According to the cover assembly provided in the first aspect of this utility model, the notch on the substrate provides a stable venting channel for the explosion-proof valve, ensuring that the internal pressure of the battery can be released normally through the notch. At the same time, the shielding part of the adhesive layer prevents electrolyte penetration through a dual mechanism of physical coverage and adhesive adsorption. The shielding part can prevent liquid from migrating upward to the surface of the explosion-proof valve, and the shielding part completely covers the notch, avoiding protection failure due to installation deviation.

[0021] According to the second aspect embodiment of this utility model, the housing, by providing the aforementioned cover assembly, can effectively prevent electrolyte leakage. It can withstand the instantaneous high pressure generated during thermal runaway of the battery cell, preventing the housing from bursting and providing a reliable structural guarantee for the normal opening of the explosion-proof valve. When the explosion-proof valve opens, the internal pressure can be quickly released through the shielding part and the explosion-proof valve.

[0022] According to the battery provided in the third aspect embodiment of this utility model, by setting the aforementioned cover assembly or the aforementioned housing, electrolyte leakage can be effectively prevented, while also ensuring that the explosion-proof valve can be opened normally. After the explosion-proof valve is triggered, the shielding part is destroyed, which can prevent high-temperature gas from impacting adjacent cells and prevent the pressure relief function from failing due to structural deformation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic exploded view of the cover plate assembly provided by this utility model.

[0025] Figure 2 This is a schematic perspective view of the cover plate assembly provided by this utility model.

[0026] Figure 3 This is a schematic top view of the cover plate assembly with the protective patch removed, provided by this utility model.

[0027] Figure 4 This is a schematic exploded view of the protective patch provided by this utility model.

[0028] Figure label:

[0029] 100. Cover plate body; 102. Explosion-proof valve; 104. Protective patch; 106. Substrate; 108. Notch; 110. Adhesive layer; 112. Shielding part; 114. Mounting hole. Detailed Implementation

[0030] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0031] like Figures 1 to 4 As shown, a first aspect embodiment of the present invention provides a cover plate assembly, comprising:

[0032] The cover plate body 100 is provided with an explosion-proof valve 102.

[0033] A protective patch 104 is provided on the explosion-proof valve 102. The protective patch 104 includes a substrate 106 and an adhesive layer 110. A notch 108 is provided on the substrate 106, and a shielding part 112 is provided on the adhesive layer 110 at the position corresponding to the notch 108.

[0034] According to the cover assembly provided in the first aspect of this utility model, the notch 108 on the substrate 106 provides a stable venting channel for the explosion-proof valve 102, ensuring that the internal pressure of the battery can be released normally through the notch 108. Simultaneously, the shielding portion 112 of the adhesive layer 110 prevents electrolyte penetration through a dual mechanism of physical covering and adhesive adsorption. The shielding portion 112 can prevent liquid from migrating upwards to the surface of the explosion-proof valve 102, and the shielding portion 112 completely covers the notch 108, avoiding protection failure due to installation deviation.

[0035] Please continue reading Figures 1 to 4 The core structure of the cover assembly is the collaborative design of the cover body 100 and the protective patch 104. The cover body 100 is made of aluminum alloy or stainless steel, formed by stamping, and the surface is anodized to enhance corrosion resistance. The explosion-proof valve 102 is fixed to the mounting hole 114 of the cover body 100 by laser welding.

[0036] The protective patch 104 consists of a substrate 106 and an adhesive layer 110. The substrate 106 can be made of polyethylene terephthalate or polyimide film with a thickness of 0.1 mm to 0.3 mm, and can be made with a circular or elliptical notch 108 by laser cutting process.

[0037] The adhesive layer 110 can be made of acrylic pressure-sensitive adhesive or silicone, with a thickness of 0.05 mm to 0.2 mm, and is disposed between the substrate 106 and the cover plate body 100. A shielding portion 112 is formed at the position of the adhesive layer 110 corresponding to the notch 108, and the shielding portion 112 forms a full coverage structure of the notch 108.

[0038] According to one embodiment of the present invention, a mounting hole 114 is provided on the cover plate body 100, an explosion-proof valve 102 is disposed in the mounting hole 114, a substrate 106 is disposed away from the explosion-proof valve 102, and a protective patch 110 is located between the substrate 106 and the explosion-proof valve 102.

[0039] In one embodiment of this utility model, a mounting hole 114 is provided on the cover plate body 100. The diameter of the mounting hole 114 is adapted to the outer diameter of the explosion-proof valve 102, and a fitting gap of 0.1-0.3 mm is usually reserved. The edge of the mounting hole 114 can be chamfered to avoid sharp edges scratching the sealing surface of the explosion-proof valve 102. The protective patch 104 is attached to the outside of the mounting hole 114 by an adhesive layer 110. The adhesive layer 110 is applied in a ring-shaped manner to ensure a tight fit with the surface of the cover plate body 100.

[0040] The annular sealing structure of the adhesive layer 110 forms the first leak-proof barrier at the edge of the mounting hole 114. Together with the shielding part 112 covering the notch 108, it can effectively prevent electrolyte from seeping from the edge of the protective patch 104 to the notch 108. For example, during the battery charging and discharging process, even if there are tiny gaps at the edge of the adhesive layer 110, the shielding part 112 can still prevent electrolyte from contacting the explosion-proof valve 102 through the notch 108, thereby ensuring that the pressure relief channel is unobstructed while improving the anti-permeability performance.

[0041] According to one embodiment of the present invention, the thickness H1 of the shielding part 112 is in the range of 0.05 mm ≤ H1 ≤ 0.2 mm.

[0042] In one embodiment of this utility model, the shielding part 112 is made of the same material as the adhesive layer 110, and during the adhesive application process, the thickness H1 of the shielding part 112 is controlled to be between 0.05 mm and 0.2 mm.

[0043] The thickness H1 of the shielding portion 112, ranging from 0.05 mm to 0.2 mm, ensures effective coverage of the notch 108 without significantly increasing the overall thickness of the protective patch 104, thus affecting the pressure triggering accuracy of the explosion-proof valve 102. When electrolyte attempts to penetrate through the notch 108, the adhesive layer 110 of the shielding portion 112 can adsorb the electrolyte through its own viscosity, while its thickness H1 forms a physical barrier, extending the electrolyte penetration path. For example, when the battery is subjected to vibration causing micro-cracks at the edge of the protective patch 104, the adhesive layer 110 of the shielding portion 112 can deform to fill the gap, preventing electrolyte from migrating upwards to the surface of the explosion-proof valve 102, thereby achieving a balance between air permeability and anti-penetration requirements.

[0044] According to one embodiment of the present invention, in a plane parallel to the protective patch 104, the projected area of ​​the blocking portion 112 is greater than or equal to the projected area of ​​the notch 108.

[0045] In one embodiment of the present invention, the edge of the shielding portion 112 may extend 0.2 mm to 0.5 mm beyond the edge of the notch 108 to form an "extended coverage" structure.

[0046] The full-coverage design of the shielding portion 112 can effectively intercept electrolyte that seeps in from the edge of the notch 108. For example, when electrolyte diffuses along the interface between the substrate 106 and the adhesive layer 110 toward the notch 108, the shielding portion 112, which extends beyond the edge of the notch 108, can guide the electrolyte to the edge of the protective patch 104 for discharge, rather than allowing it to seep into the notch 108 and contact the explosion-proof valve 102.

[0047] According to one embodiment of the present invention, the thickness H2 of the substrate 106 is in the range of 0.1 mm ≤ H2 ≤ 0.3 mm.

[0048] In one embodiment of this invention, the thickness H2 of the substrate 106, ranging from 0.1 mm to 0.3 mm, balances mechanical strength and flexibility. A thinner substrate 106 (e.g., 0.1 mm) improves the adhesion between the protective patch 104 and the surface of the explosion-proof valve 102, reducing edge warping caused by excessive hardness of the substrate 106, thereby reducing the risk of electrolyte penetration from the interface between the substrate 106 and the adhesive layer 110; a thicker substrate 106 (e.g., 0.3 mm) provides better impact resistance, preventing external particle impacts from causing deformation and blockage of the notch 108.

[0049] According to one embodiment of the present invention, the thickness H3 of the adhesive layer 110 is in the range of 0.05 mm ≤ H3 ≤ 0.2 mm.

[0050] In one embodiment of this utility model, the thickness H3 of the adhesive layer 110, ranging from 0.05 mm to 0.2 mm, balances adhesive strength and anti-permeability performance. A thinner adhesive layer 110 (e.g., 0.05 mm) has higher shear strength, allowing it to adhere tightly to the surface of the cover plate body 100 and reducing permeation paths caused by air bubbles in the adhesive layer 110; a thicker adhesive layer 110 (e.g., 0.2 mm) can fill the microscopic gaps between the substrate 106 and the cover plate body 100 through its own thickness H3, forming a continuous sealing layer.

[0051] According to one embodiment of the present invention, the shielding part 112 and the adhesive layer 110 are integrally formed.

[0052] In one embodiment of this invention, the shielding portion 112 and the adhesive layer 110 are manufactured using a "one-piece molding" process. This one-piece molding process eliminates potential gaps between the shielding portion 112 and the adhesive layer 110, making the anti-permeability structure more reliable. During long-term battery storage, the one-piece molded shielding portion 112 will not peel off due to the aging of the adhesive layer 110, continuously preventing electrolyte from penetrating through the notch 108. Simultaneously, this process simplifies the production process, avoids the positional deviation problems caused by traditional secondary adhesive coating, and ensures the alignment accuracy of the shielding portion 112 and the notch 108, thereby effectively improving the stability and consistency of the anti-permeability function.

[0053] According to one embodiment of the present invention, there are at least two notches 108, and the at least two notches 108 are symmetrically arranged around the center of the substrate 106, with the shielding part 112 corresponding to the notch 108 one by one.

[0054] In one embodiment of this utility model, at least two notches 108 are formed on the substrate 106, distributed at 180° or 90° with the center of the substrate 106 as the symmetrical point. The symmetrically distributed notches 108 are designed to balance the air pressure on the surface of the explosion-proof valve 102, and avoid valve opening pressure deviation caused by unilateral air penetration.

[0055] Meanwhile, the symmetrically arranged shielding portions 112 can form a multi-point anti-permeation barrier. Even if the adhesive layer 110 near a certain gap 108 fails locally, the other shielding portions 112 can still prevent electrolyte permeation. For example, in a battery overcharge test, when electrolyte leakage occurs due to cracking of the adhesive layer 110 in one gap 108, the symmetrically positioned shielding portions 112 can effectively intercept the liquid diffusion and prevent it from covering the entire surface of the explosion-proof valve 102, thereby minimizing the risk of electrolyte permeation while ensuring the pressure relief function.

[0056] A second aspect of this utility model provides a housing, including the cover plate assembly as described above.

[0057] According to the second aspect embodiment of this utility model, the housing, by providing the aforementioned cover assembly, can effectively prevent electrolyte leakage. It can withstand the instantaneous high pressure generated during thermal runaway of the battery cell, preventing the housing from bursting and providing a reliable structural guarantee for the normal opening of the explosion-proof valve 102. When the explosion-proof valve 102 is opened, the internal pressure can be quickly released through the shielding part 112 and the explosion-proof valve 102.

[0058] In the second aspect embodiment of the present invention, the housing is made of aluminum alloy or stainless steel and is formed by stamping or die casting.

[0059] The interior of the housing body forms a cavity to accommodate the battery cell; the cover plate assembly is sealed to the housing body by laser welding or ultrasonic welding.

[0060] A third aspect of this utility model provides a battery, including the cover plate assembly as described above;

[0061] Or a casing as described above.

[0062] According to the battery provided in the third aspect embodiment of this utility model, by setting the above-mentioned cover plate assembly or the above-mentioned housing, electrolyte leakage can be effectively avoided, while ensuring that the explosion-proof valve 102 can be opened normally. After the explosion-proof valve 102 is triggered, the shielding part 112 is destroyed, which can prevent high-temperature gas from impacting adjacent cells and prevent the pressure relief function from failing due to structural deformation.

[0063] In the battery provided in the third aspect embodiment of this utility model, the core structure of the battery is the integration of the cell module and the cover plate assembly. The cover plate assembly is connected to the top opening of the battery by bolts or clips, the explosion-proof valve 102 is covered by a protective patch 104, and the shielding part 112 is precisely aligned with the notch 108 of the substrate 106 to ensure ventilation efficiency.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body is equipped with an explosion-proof valve; A protective patch is provided on the explosion-proof valve. The protective patch includes a substrate and an adhesive layer. A notch is provided on the substrate, and a shielding part is provided on the adhesive layer at the position corresponding to the notch.

2. The cover plate assembly according to claim 1, characterized in that, The cover plate body has an installation hole, the explosion-proof valve is disposed in the installation hole, the substrate is disposed away from the explosion-proof valve, and the protective patch is located between the substrate and the explosion-proof valve.

3. The cover plate assembly according to claim 1, characterized in that, The thickness H1 of the shielding part is in the range of 0.05 mm ≤ H1 ≤ 0.2 mm.

4. The cover plate assembly according to claim 1, characterized in that, In a plane parallel to the protective patch, the projected area of ​​the blocking portion is greater than or equal to the projected area of ​​the notch.

5. The cover plate assembly according to claim 1, characterized in that, The thickness H2 of the substrate is in the range of 0.1 mm ≤ H2 ≤ 0.3 mm.

6. The cover plate assembly according to claim 1, characterized in that, The thickness H3 of the adhesive layer is in the range of 0.05 mm ≤ H3 ≤ 0.2 mm.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that, The shielding part is integrally formed with the adhesive layer.

8. The cover plate assembly according to any one of claims 1 to 6, characterized in that, There are at least two notches, and the at least two notches are symmetrically arranged around the center of the substrate, with the blocking portion corresponding to each notch.

9. A housing, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 8.

10. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 8; Or the housing as described in claim 9.

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