Cover plate assembly, battery cell and battery

Abstract

The utility model relates to the field of batteries, and provides a cover plate assembly, a battery cell and a battery. The cover plate assembly comprises a cover plate body, at least part of the cover plate body is coated with a first insulating layer, the side, away from the cover plate body, of the first insulating layer is coated with a second insulating layer, and the second insulating layer coats the first insulating layer and the edge of part of the cover plate body. In the cover plate assembly, the insulation effect of the cover plate assembly is greatly improved due to the arrangement of the double-layer insulation structure. The first insulating layer provides basic insulation protection for the cover plate body, and the second insulating layer enhances the insulation protection effect; risks of safety accidents such as electric leakage and short circuit of the battery are effectively reduced, and normal use of the battery and safety of a user are guaranteed; and the edge of the cover plate body is partially wrapped by the second insulating layer, so that external moisture, dust, corrosive substances and the like can be prevented from entering the battery.

Description

Technical Field

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

[0002] In related technologies, after the battery cover is welded to the casing, an insulating layer is applied to the cover to enhance its insulation and protective properties. However, due to manufacturing and assembly tolerances, the insulating layer cannot fit tightly against the edges of the cover, resulting in a decrease in insulation performance. Utility Model Content

[0003] This utility model provides a cover plate assembly to solve the defect in related technologies where poor sealing of the cover plate leads to insulation failure.

[0004] This utility model embodiment also provides a battery cell.

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

[0006] A first aspect of this utility model provides a cover plate assembly, including a cover plate body, at least a portion of the cover plate body being covered with a first insulating layer, the side of the first insulating layer opposite to the cover plate body being covered with a second insulating layer, the second insulating layer covering the first insulating layer and a portion of the edge of the cover plate body.

[0007] According to one embodiment of the present invention, the distance between the edge of the first insulating layer and the edge of the cover plate body ranges from 0.2 mm to 1 mm.

[0008] According to one embodiment of the present invention, the thickness of the first insulating layer ranges from 0.05 mm to 0.5 mm.

[0009] According to one embodiment of the present invention, the thickness of the second insulating layer ranges from 0.05 mm to 0.5 mm.

[0010] According to one embodiment of the present invention, the thickness of the first insulating layer ranges from 0.05 mm to 0.5 mm;

[0011] The thickness of the second insulating layer ranges from 0.05 mm to 0.5 mm.

[0012] According to one embodiment of the present invention, the edge of the second insulating layer is formed with a folded edge, the folded edge being adapted to cover at least a portion of the circumferential sidewall of the cover plate body.

[0013] According to one embodiment of the present invention, the length of the folded edge ranges from 2 mm to 10 mm.

[0014] According to one embodiment of the present invention, a first through hole corresponding to the pole post and a second through hole corresponding to the explosion-proof valve are provided on the first insulating layer;

[0015] The second insulating layer has a third via corresponding to the first via and a fourth via corresponding to the second via.

[0016] A second aspect of this utility model provides a battery cell, including a housing and a cover plate assembly as described above, the cover plate assembly being disposed on the housing.

[0017] A third aspect of this utility model provides a battery, including the cover assembly as described above, or the battery cell as described above.

[0018] According to the cover assembly provided in the first aspect of this utility model, the double-layer insulation structure greatly improves the insulation effect of the cover assembly. The first insulation layer provides basic insulation protection for the cover body, while the second insulation layer further enhances the insulation protection effect. Even if the first insulation layer is partially damaged or its performance degrades under certain circumstances, the second insulation layer can still play an insulating role, effectively reducing the risk of safety accidents such as battery leakage and short circuit, and ensuring the normal use of the battery and the safety of the user. By covering part of the edge of the cover body with the second insulation layer, external moisture, dust, corrosive substances, etc., can be prevented from entering the battery, avoiding these substances from eroding and damaging the internal structure of the battery, thereby extending the battery's service life.

[0019] According to the second aspect embodiment of the present invention, the cover plate assembly with a double-layer insulation structure can effectively prevent the current inside the battery cell from leaking to the outside, avoiding safety accidents caused by leakage, such as electric shock and fire, and significantly improving the safety of the battery cell. At the same time, the good sealing performance can prevent the leakage of electrolyte inside the battery cell. Electrolytes are usually corrosive, and leakage could harm surrounding equipment and personnel. Furthermore, the first and second insulation layers can also prevent external static electricity and other factors from interfering with the internal structure of the battery cell, ensuring the stability and safety of the battery cell during use.

[0020] According to the battery provided in the third aspect embodiment of this utility model, whether a cover plate assembly is used directly or an integrated cell is used, the double-layer insulation structure (first insulation layer + second insulation layer) can significantly enhance the battery's insulation protection capability. The first insulation layer isolates the cover plate body from the internal conductive components, and the second insulation layer, through edge covering and folded edge design, eliminates the risk of edge exposure caused by manufacturing / assembly tolerances, prevents external moisture, dust, etc. from entering the battery through gaps, and avoids leakage or short circuit between the terminals and the casing, making it particularly suitable for high-voltage, high-current scenarios. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic exploded view of the cover plate assembly provided by this utility model.

[0023] Figure 2 This is a schematic top view of the cover plate assembly provided by this utility model with the second insulating layer concealed.

[0024] Figure 3 This is a schematic perspective view of the cover plate assembly provided by this utility model.

[0025] Figure 4 This is a schematic perspective view of the battery provided by this utility model.

[0026] Figure label:

[0027] 100. Cover plate body; 102. First insulating layer; 104. Second insulating layer; 106. Folded edge; 108. First through hole; 110. Second through hole; 112. Third through hole; 114. Fourth through hole. Detailed Implementation

[0028] 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.

[0029] like Figures 1 to 4 As shown, a first aspect embodiment of the present invention provides a cover plate assembly, including a cover plate body 100, at least a portion of the cover plate body 100 is covered with a first insulating layer 102, a second insulating layer 104 is covered on the side of the first insulating layer 102 away from the cover plate body 100, and the second insulating layer 104 covers the first insulating layer 102 and a portion of the edge of the cover plate body 100.

[0030] According to the cover assembly provided in the first aspect of this utility model, the double-layer insulation structure greatly improves the insulation effect of the cover assembly. The first insulation layer 102 provides basic insulation protection for the cover body 100, while the second insulation layer 104 further enhances the insulation protection effect. Even if the first insulation layer 102 is partially damaged or its performance degrades under certain circumstances, the second insulation layer 104 can still play an insulating role, effectively reducing the risk of safety accidents such as battery leakage and short circuit, and ensuring the normal use of the battery and the safety of the user. By covering part of the edge of the cover body 100 with the second insulation layer 104, external moisture, dust, corrosive substances, etc., can be prevented from entering the battery, avoiding these substances from eroding and damaging the internal structure of the battery, thereby extending the battery's service life.

[0031] Please continue reading Figures 1 to 4 In the cover plate assembly provided in the first aspect embodiment of this utility model, the cover plate body 100 is the basic support structure of the entire assembly. It is usually made of a material with certain strength and stability to meet the requirements of devices such as batteries for structural integrity and safety.

[0032] The first insulating layer 102 at least partially covers the cover body 100, and its covering method can be to adhere to the surface of the cover body 100. This adhesion needs to be tight and flat to ensure good insulation performance. The material selection of the first insulating layer 102 is carefully considered to have good insulation properties, effectively prevent current conduction, and avoid safety problems such as leakage between the internal circuit of the battery and the external environment.

[0033] The second insulating layer 104 covers the side of the first insulating layer 102 facing away from the cover body 100, and it not only covers the first insulating layer 102 but also extends to part of the edge of the cover body 100. During the covering process, the second insulating layer 104 will tightly adhere to the surface of the first insulating layer 102, while simultaneously wrapping the edge of the cover body 100. This process needs to ensure the airtightness between the second insulating layer 104 and the first insulating layer 102, as well as the edge of the cover body 100. For example, hot pressing, gluing, or other processes can be used during manufacturing to firmly attach the second insulating layer 104 to the first insulating layer 102 and the edge of the cover body 100, preventing gaps or loosening.

[0034] According to one embodiment of the present invention, the distance between the edge of the first insulating layer 102 and the edge of the cover plate body 100 ranges from 0.2 mm to 1 mm.

[0035] In one embodiment of this utility model, a gap of 0.2 mm to 1 mm is reserved between the edge of the first insulating layer 102 and the edge of the cover plate body 100. This gap ensures that the first insulating layer 102 does not completely cover the edge area of ​​the cover plate body 100, providing space for the second insulating layer 104 to cover the edge. This prevents the edge of the first insulating layer 102 from being directly flush with or exceeding the edge of the cover plate body 100, thereby ensuring that the second insulating layer 104 can effectively cover the edge of the first insulating layer 102 and part of the edge of the cover plate body 100.

[0036] By limiting the distance between the edge of the first insulating layer 102 and the edge of the cover plate body 100, the problem of the edge of the second insulating layer 104 not fitting tightly with the edge of the cover plate body 100 due to manufacturing or assembly tolerances can be avoided. The second insulating layer 104 can extend through this distance area and cover the edge of the cover plate body 100, forming a double insulating protection structure, improving the sealing and insulation performance of the edge area, and preventing contaminants such as liquids and dust in the external environment from affecting the internal insulation of the battery through the edge gap.

[0037] According to one embodiment of the present invention, the thickness of the first insulating layer 102 ranges from 0.05 mm to 0.5 mm.

[0038] In one embodiment of this utility model, the thickness of the first insulating layer 102 is set to 0.05 mm to 0.5 mm. This thickness range can be flexibly set according to the dielectric strength, flexibility of the insulating material and the assembly precision of the cover plate assembly, ensuring that the first insulating layer 102 provides sufficient insulation protection when covering the surface of the cover plate body 100, without causing assembly interference when superimposed with the second insulating layer 104 due to excessive thickness.

[0039] The thickness design of the first insulating layer 102 ensures that it meets insulation performance requirements while also possessing good adhesion and mechanical strength. A thinner thickness (e.g., 0.05 mm) allows the first insulating layer 102 to be lightweight and easily adhered to complex curved surfaces, while a thicker thickness (e.g., 0.5 mm) is suitable for enhanced insulation requirements in high-voltage scenarios, avoiding insulation failure due to insufficient thickness or affecting the overall structural strength of the cover plate assembly due to excessive thickness.

[0040] According to one embodiment of the present invention, the thickness of the second insulating layer 104 ranges from 0.05 mm to 0.5 mm.

[0041] In one embodiment of this invention, the thickness of the second insulating layer 104 is set to 0.05 mm to 0.5 mm. This thickness matches that of the first insulating layer 102, ensuring that when the second insulating layer 104 covers the first insulating layer 102 and the edge of the cover plate body 100, it can completely cover the surface of the first insulating layer 102 and also fit tightly against the sidewall of the cover plate body 100, forming a continuous insulating protective layer.

[0042] The thickness of the second insulating layer 104 is optimized to balance insulation performance and structural stability. A thinner thickness facilitates the forming and bending of the folded edge 106, ensuring flexibility in edge coverage; a thicker thickness enhances the insulation strength of the edge area, resists external mechanical stress or environmental erosion, avoids local insulation weaknesses caused by uneven thickness, and improves the overall reliability of the cover assembly.

[0043] According to one embodiment of the present invention, the thickness of the first insulating layer 102 ranges from 0.05 mm to 0.5 mm; the thickness of the second insulating layer 104 ranges from 0.05 mm to 0.5 mm.

[0044] In one embodiment of this utility model, the thickness design of the first insulating layer 102 enables it to meet insulation performance requirements while possessing good adhesion and mechanical strength. A thinner thickness (e.g., 0.05 mm) ensures that the first insulating layer 102 can be lightweight and easily adhered to complex curved surfaces, while a thicker thickness (e.g., 0.5 mm) is suitable for enhanced insulation requirements in high-voltage scenarios, avoiding insulation failure due to insufficient thickness or affecting the overall structural strength of the cover plate assembly due to excessive thickness.

[0045] The thickness of the second insulating layer 104 is optimized to balance insulation performance and structural stability. A thinner thickness facilitates the forming and bending of the folded edge 106, ensuring flexibility in edge coverage; a thicker thickness enhances the insulation strength of the edge area, resists external mechanical stress or environmental erosion, avoids local insulation weaknesses caused by uneven thickness, and improves the overall reliability of the cover assembly.

[0046] According to one embodiment of the present invention, the edge of the second insulating layer 104 is formed with a folded edge 106, which is adapted to cover at least a portion of the circumferential sidewall of the cover plate body 100; the length of the folded edge 106 is in the range of 2 mm to 10 mm.

[0047] In one embodiment of this utility model, the edge of the second insulating layer 104 extends toward the circumferential sidewall of the cover plate body 100 to form a folded edge 106. The width of the folded edge 106 (i.e., the length extending along the sidewall of the cover plate body 100) is 2 mm to 10 mm. The folded edge 106 fits tightly against the sidewall surface of the cover plate body 100, covering part of the sidewall area, forming a surrounding insulating protective structure.

[0048] The design of the folded edge 106 significantly improves the insulation and sealing performance of the cover assembly's edges. By covering the sidewalls, it effectively prevents liquids (such as electrolytes) or gases from seeping into the weld seams between the cover and the housing, avoiding the risk of short circuits caused by exposed edges. At the same time, the length range of the folded edge 106 balances ease of assembly with protective effect: shorter folded edges 106 (e.g., 2 mm) facilitate quick assembly, while longer folded edges 106 (e.g., 10 mm) are suitable for scenarios with higher sealing requirements, further enhancing insulation performance by increasing the coverage area and offsetting issues of loose fit caused by tolerances.

[0049] According to one embodiment of the present invention, a first through hole 108 corresponding to the pole post and a second through hole 110 corresponding to the explosion-proof valve are provided on the first insulating layer 102; a third through hole 112 corresponding to the first through hole 108 and a fourth through hole 114 corresponding to the second through hole 110 are provided on the second insulating layer 104.

[0050] In one embodiment of this utility model, a first through hole 108 corresponding to the position of the pole post and a second through hole 110 corresponding to the position of the explosion-proof valve are formed on the first insulating layer 102; a third through hole 112 and a fourth through hole 114 are formed on the second insulating layer 104, wherein the third through hole 112 is coaxially aligned with the first through hole 108, and the fourth through hole 114 is coaxially aligned with the second through hole 110. The diameter of each of the above through holes matches the outer diameter of the pole post and the explosion-proof valve, ensuring that after the pole post and the explosion-proof valve pass through the through holes, the edge of the insulating layer fits tightly with the surface of the component without obvious gaps.

[0051] The aforementioned vias ensure the proper installation and functionality of the pole and explosion-proof valve, while maintaining the integrity of the insulation layers. The aligned via design of the first insulation layer 102 and the second insulation layer 104 prevents misalignment or overlap of the two insulation layers in the component mounting area, ensuring effective insulation between the pole and the cover plate body 100, and between the explosion-proof valve and the cover plate body 100. Furthermore, the smoothing of the via edges prevents insulation layer damage caused by stress concentration, improves the reliability of the component connection area, and avoids insulation failure or functional malfunction due to improper via design.

[0052] A second aspect of this utility model provides a battery cell, including a housing and a cover plate assembly as described above, the cover plate assembly being disposed on the housing.

[0053] In the battery cell provided in the second aspect embodiment of this utility model, the basic structure of the battery cell consists of a housing and the aforementioned cover plate assembly.

[0054] The casing is typically made of materials with a certain strength and corrosion resistance, such as metals (e.g., aluminum, stainless steel) or high-strength plastics. The shape and size of the casing depend on the specific design of the battery cell and the application requirements, and are generally square or cylindrical, forming an internal space for housing the core components of the battery cell, such as electrodes and electrolytes.

[0055] The cover assembly, mounted on the housing, plays a crucial role in sealing and protecting the internal structure of the battery cell. During installation, the connection between the cover assembly and the housing must ensure excellent sealing performance. For example, if the housing is square, the cover assembly will match the opening size of the housing and be tightly connected to the housing through welding, riveting, or sealant to prevent electrolyte leakage from the battery cell and the ingress of external air and moisture.

[0056] The first insulating layer 102 covers at least a portion of the cover plate body 100, ensuring effective insulation between the cover plate body 100 and conductive components such as electrodes inside the battery cell. The second insulating layer 104 not only covers the first insulating layer 102 but also extends to the edge of a portion of the cover plate body 100, further enhancing insulation and sealing performance and preventing leakage or short circuits at the connection between the cover plate assembly and the housing.

[0057] According to the second aspect embodiment of the present invention, the cover plate assembly with a double-layer insulation structure can effectively prevent the current inside the battery cell from leaking to the outside, avoiding safety accidents caused by leakage, such as electric shock and fire, and significantly improving the safety of the battery cell. At the same time, the good sealing performance can prevent the leakage of electrolyte inside the battery cell. Electrolytes are usually corrosive, and leakage could cause harm to surrounding equipment and personnel. Furthermore, the provision of the first insulating layer 102 and the second insulating layer 104 can also prevent external static electricity and other factors from interfering with the internal structure of the battery cell, ensuring the stability and safety of the battery cell during use.

[0058] A third aspect of this utility model provides a battery, including the cover assembly as described above, or the battery cell as described above.

[0059] The battery provided in the third aspect embodiment of this utility model has two implementation forms in its core structure:

[0060] If the battery includes a cover assembly, the battery body is composed of a casing, electrodes, electrolyte, and the aforementioned cover assembly. The cover assembly is installed at the top or side opening of the casing, serving as the core component for sealing and insulation of the battery. The cover body 100 is fixedly connected to the casing by welding, riveting, or sealant. A first insulating layer 102 covers the conductive or leakage-prone areas of the cover body 100 (such as the terminal mounting position or circuit connection area). A second insulating layer 104 covers the first insulating layer 102 and extends to cover the edge of the cover body 100, forming a sealed fit with the casing. The terminals pass through through holes in the first and second insulating layers 102 and are electrically connected to the internal electrodes of the battery. The edges of the through holes are reinforced with folded edges 106 or thickened designs to enhance insulation and sealing.

[0061] The battery is composed of one or more of the aforementioned cells (with integrated housing and cover assemblies) connected in series, parallel, or in a mixed combination. Each cell's cover assembly has achieved double-layer insulation protection. The cells are connected by conductive components such as wires and busbars, and are externally encased in a protective shell or heat dissipation structure. The folded edge 106 design of the cover assembly effectively isolates the metal housings of adjacent cells, avoiding short circuits caused by housing contact due to assembly tolerances. At the same time, the through-hole structure ensures the insulation and sealing of the terminal connections.

[0062] According to the battery provided in the third aspect embodiment of this utility model, whether a cover plate assembly is used directly or an integrated cell is used, the double-layer insulation structure (first insulation layer 102 + second insulation layer 104) can significantly enhance the battery's insulation protection capability. The first insulation layer 102 isolates the cover plate body 100 from the internal conductive components, and the second insulation layer 104, through edge covering and folded edge 106 design, eliminates the risk of edge exposure caused by manufacturing / assembly tolerances, prevents external moisture, dust, etc. from entering the battery through gaps, and avoids leakage or short circuit between the terminals and the casing, which is especially suitable for high-voltage and high-current scenarios.

[0063] 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 by The cover plate includes a cover body, at least a portion of which is covered with a first insulating layer. A second insulating layer is covered on the side of the first insulating layer opposite to the cover body. The second insulating layer covers the first insulating layer and a portion of the edge of the cover body.

2. The cover plate assembly of claim 1, wherein, The distance between the edge of the first insulating layer and the edge of the cover plate body ranges from 0.2 mm to 1 mm.

3. The cover plate assembly of claim 1, wherein, The thickness of the first insulating layer ranges from 0.05 mm to 0.5 mm.

4. The cover plate assembly of claim 1, wherein, The thickness of the second insulating layer ranges from 0.05 mm to 0.5 mm.

5. The cover plate assembly of claim 1, wherein, The thickness of the first insulating layer ranges from 0.05 mm to 0.5 mm; The thickness of the second insulating layer ranges from 0.05 mm to 0.5 mm.

6. The cover plate assembly of claim 1, wherein, The edge of the second insulating layer is formed with a folded edge, which is adapted to cover at least a portion of the circumferential sidewall of the cover plate body.

7. The cover plate assembly of claim 6, wherein, The length of the folded edge ranges from 2 mm to 10 mm.

8. The cover plate assembly of any one of claims 1 to 5, wherein, The first insulating layer has a first through hole corresponding to the pole post and a second through hole corresponding to the explosion-proof valve; The second insulating layer has a third via corresponding to the first via and a fourth via corresponding to the second via.

9. An electric cell characterized by It includes a housing and a cover assembly as described in any one of claims 1 to 8, the cover assembly being disposed on the housing.

10. A battery, characterized by It includes the cover plate assembly as described in any one of claims 1 to 8, or the battery cell as described in claim 9.

Images