Cover plate structure and power battery

Abstract

The utility model provides a kind of cover plate structure and power battery.The cover plate structure includes: substrate, and the boss is arranged on substrate, and the boss includes annular mounting portion and extension, and the through hole is arranged on annular mounting portion, and the mounting slot is arranged on the side of annular mounting portion, and extension is arranged in the outer periphery of annular mounting portion, and the first end of extension is connected with annular mounting portion, and the second end of extension extends along the direction of being away from annular mounting portion;And explosion relief valve, explosion relief valve is installed in mounting slot and covers through hole.The technical scheme of the utility model's cover plate structure can solve the problem that existing battery cover plate is prone to deformation under abnormal condition of battery, leading to explosion relief valve cannot be normally opened according to specified pressure threshold.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a cover plate structure and a power battery. Background Technology

[0002] As the "heart" of new energy vehicles, the performance and safety of the power battery are crucial to the overall operation of the vehicle. The battery system must not only ensure efficient energy output under normal operating conditions but also maintain a stable and safe operating state when facing extreme conditions or abnormal situations. However, under abnormal conditions such as overcharging, over-discharging, short circuits, or mechanical damage, lithium-ion batteries may generate a large amount of gas, causing a sharp increase in internal battery pressure. If the pressure exceeds the design capacity of the battery cover, deformation may occur, potentially leading to a safety accident.

[0003] However, existing battery covers are prone to deformation under abnormal battery conditions, and the explosion-proof valve may fail to open normally according to the specified pressure threshold. There is a risk that the explosion-proof valve may not open while the surrounding welded joints open, meaning that the weld between the explosion-proof valve and the battery cover may burst open. At this time, explosive substances inside the battery cell may splash out. These substances are flammable or explosive and may cause a fire or further chemical reaction once they come into contact with air, resulting in a chain reaction and posing a serious threat to the safety of the vehicle and passengers. Utility Model Content

[0004] The main purpose of this utility model is to provide a cover plate structure and a power battery that can solve the problem that existing battery covers are prone to deformation under abnormal battery conditions, causing the explosion-proof valve to fail to open normally according to the specified pressure threshold.

[0005] To achieve the above objectives, according to one aspect of the present invention, a cover plate structure is provided, comprising: a base plate, on which a boss is provided, the boss including an annular mounting portion and an extension portion, the annular mounting portion having a through hole, a mounting groove being provided on one side of the annular mounting portion, the extension portion being disposed on the outer periphery of the annular mounting portion, a first end of the extension portion being connected to the annular mounting portion, and a second end of the extension portion extending in a direction away from the annular mounting portion; and an explosion-proof valve, the explosion-proof valve being installed in the mounting groove and covering the through hole.

[0006] The above settings can enhance the structural strength of the substrate, reduce the deformation of the substrate when the battery experiences thermal runaway, and ensure that the explosion-proof valve opens normally according to the specified pressure threshold, effectively reducing the risk of battery explosion.

[0007] Furthermore, the second end of the extension extends along the width direction of the substrate.

[0008] The above-mentioned design can enhance the structural strength of the substrate, making it more resistant to mechanical shocks and pressures.

[0009] Furthermore, there are two extensions, which are disposed on opposite sides of the annular mounting portion along the width direction of the substrate.

[0010] The above-mentioned design can enhance the structural strength of the substrate. At the same time, when the battery experiences thermal runaway or is subjected to external pressure, the pressure can be distributed more evenly, reducing local stress concentration.

[0011] Furthermore, the distance between the end of the second end of the extension and the long side of the substrate on the side where it is located is L1, and the value of L1 is in the range of 1mm≤L1≤30mm.

[0012] Furthermore, the width W of the extension ranges from 2mm to 5mm.

[0013] The above settings ensure the structural strength of the extension.

[0014] Furthermore, the cover plate structure also includes a protective film. The top surface of the annular mounting part is a plane, and the protective film is bonded to the plane. The outer edge of the plane protrudes beyond the outer edge of the protective film.

[0015] The above setup provides installation space for the protective membrane and protects the explosion-proof valve from dust, dirt, or other contaminants. It also prevents moisture and corrosive substances from contacting the valve, extending its service life.

[0016] Furthermore, the distance between the plane and the surface of the substrate away from the explosion-proof valve is L2, and the value of L2 is in the range of 0.5mm≤L2≤3mm.

[0017] Furthermore, the mounting groove is configured to fit the explosion-proof valve, and the outer edge of the annular mounting portion protrudes 1mm to 10mm beyond the outer edge of the explosion-proof valve.

[0018] The above settings can improve the installation stability of the explosion-proof valve and effectively reduce the deformation of the base plate and the explosion-proof valve during the battery charging process.

[0019] Furthermore, the thickness of the boss ranges from 2mm to 3mm; and / or, the boss is integrally formed with the substrate.

[0020] The above settings ensure the structural strength of the boss.

[0021] According to another aspect of the present invention, a power battery is provided, comprising: the aforementioned cover structure; and a battery housing, wherein the cover structure is mounted on the battery housing.

[0022] The present invention employs a cover plate and an explosion-proof valve. A boss is provided on the substrate, the boss including an annular mounting part and an extension part. A mounting groove is provided on one side of the annular mounting part, and the explosion-proof valve is installed in the mounting groove. The annular mounting part and the extension part can strengthen the structural strength of the substrate, reduce the deformation of the substrate when the battery experiences thermal runaway, and enable the explosion-proof valve to open normally according to the specified pressure threshold, effectively reducing the risk of battery explosion. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof.

[0024] In the picture:

[0025] Figure 1 An exploded view of the cover plate structure according to an embodiment of the present invention is shown;

[0026] Figure 2 A cross-sectional view of the cover plate structure according to an embodiment of the present invention is shown;

[0027] Figure 3 A partial structural schematic diagram of the cover plate structure according to an embodiment of the present invention is shown;

[0028] Figure 4 A cross-sectional view of the boss according to an embodiment of the present invention is shown;

[0029] Figure 5 A partial structural schematic diagram of the cover plate structure according to an embodiment of the present invention is shown.

[0030] The above figures include the following reference numerals:

[0031] 10. Substrate; 11. Boss; 111. Annular mounting part; 112. Extension part; 113. Through hole; 114. Mounting groove; 20. Explosion-proof valve; 30. Protective film. Detailed Implementation

[0032] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] See also Figures 1 to 5As shown, this utility model provides a cover plate structure, which includes: a base plate 10, on which a boss 11 is provided, the boss 11 including an annular mounting portion 111 and an extension portion 112, the annular mounting portion 111 having a through hole 113, a mounting groove 114 being provided on one side of the annular mounting portion 111, the extension portion 112 being disposed on the outer periphery of the annular mounting portion 111, the first end of the extension portion 112 being connected to the annular mounting portion 111, and the second end of the extension portion 112 extending in a direction away from the annular mounting portion 111; and an explosion-proof valve 20, which is installed in the mounting groove 114 and covers the through hole 113.

[0034] In this embodiment, the explosion-proof valve 20 is installed in the mounting groove 114 and is correspondingly set with the through hole 113. When the battery experiences thermal runaway, the explosion-proof valve 20 opens, and the gas inside the battery is released to the outside through the through hole 113, thereby depressurizing the battery.

[0035] The boss 11 is harder than the substrate 10. The boss 11 can strengthen the structural strength of the substrate 10. The explosion-proof valve 20 is installed in the mounting groove 114 on the annular mounting part 111, which strengthens the structural strength of the area around the explosion-proof valve 20. When the gas pressure inside the cell increases, it will exert outward pressure on the substrate 10. The boss 11 can resist this outward pressure and limit the deformation range of the substrate 10, thereby reducing the total deformation of the substrate 10.

[0036] Meanwhile, the protrusion 11 actually creates a stress concentration area around the explosion-proof valve. When the internal pressure of the battery cell increases, the protrusion 11 effectively restricts the expansion of the substrate 10 around the explosion-proof valve, resulting in a relatively concentrated stress in this area. This concentrated stress is a greater pressure for the explosion-proof valve, allowing it to sense sufficient stress changes at a lower internal pressure and thus open in advance to release the gas inside the battery cell and prevent the pressure from continuing to rise. Through the above settings, it is ensured that the explosion-proof valve can reliably open under the specified pressure threshold, rather than opening only after the substrate has deformed over a large area, thereby reducing the risk of the battery cell's aluminum shell or weld seam bursting open.

[0037] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the second end of the extension 112 extends along the width direction of the substrate 10.

[0038] In this embodiment, the second end of the extension 112 extends along the width direction of the substrate 10, that is, the extension 112 is perpendicular to the long side of the substrate 10. With the above arrangement, the structural strength of the substrate 10 can be strengthened, making it more resistant to mechanical impact and pressure.

[0039] See also Figures 1 to 5As shown, in one embodiment of the present invention, there are two extensions 112, which are disposed on opposite sides of the annular mounting portion 111 along the width direction of the substrate 10.

[0040] In this embodiment, the two extensions 112 are symmetrically arranged on opposite sides of the annular mounting portion 111, which can strengthen the structural strength of the substrate 10. At the same time, when the battery experiences thermal runaway or is subjected to external pressure, these pressures can be distributed more evenly, reducing local stress concentration.

[0041] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the distance between the end of the second end of the extension 112 and the long side of the substrate 10 on the side where it is located is L1, and the value of L1 is in the range of 1mm≤L1≤30mm.

[0042] The above-mentioned design allows the explosion-proof valve to sense sufficient stress changes even under relatively low internal pressure, thereby improving its opening sensitivity. This is because the extension restricts the deformation of the substrate 10, making the stress changes at the explosion-proof valve more pronounced, allowing the valve to respond more quickly and release the pressure accumulated inside the battery cell in a timely manner.

[0043] See also Figures 1 to 5 As shown, in one embodiment of this utility model, the width W of the extension 112 is in the range of 2mm≤W≤5mm.

[0044] The above-mentioned configuration ensures the structural strength of the extension 112.

[0045] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the cover plate structure further includes a protective film 30, the top surface of the annular mounting part 111 is a plane, the protective film 30 is bonded to the plane, and the outer edge of the plane protrudes beyond the outer edge of the protective film 30.

[0046] In this embodiment, the top surface of the annular mounting portion 111 is a plane, and the plane is parallel to the surface of the substrate 10. The protective film 30 is adhered to the annular mounting portion 111, and the protective film 30 is located above the explosion-proof valve 20. The protective film 30 is used to isolate the external environment and protect the explosion-proof valve 20, preventing dust, dirt or other contaminants from entering the explosion-proof valve 20. The protective film 30 can also prevent moisture and corrosive substances from contacting the explosion-proof valve 20, thus extending its service life.

[0047] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the distance between the plane and the surface of the substrate 10 away from the explosion-proof valve 20 is L2, and the value of L2 is in the range of 0.5mm≤L2≤3mm.

[0048] With the above configuration, it is possible to ensure that the annular mounting portion 111 significantly enhances the structural strength of the substrate 10 and suppresses the deformation of the substrate 10, while also ensuring that the annular mounting portion 111 does not excessively increase the external dimensions of the battery cell.

[0049] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the mounting groove 114 is configured to be adapted to the explosion-proof valve 20, and the outer edge of the annular mounting portion 111 protrudes 1mm to 10mm beyond the outer edge of the explosion-proof valve 20.

[0050] In this embodiment, the shape of the annular mounting portion 111 is the same as that of the explosion-proof valve 20, and the mounting groove 114 is adapted to the explosion-proof valve 20, which can improve the installation stability of the explosion-proof valve 20. The outer edge of the annular mounting portion 111 protrudes 1mm to 10mm beyond the outer edge of the explosion-proof valve 20, which can effectively reduce the deformation of the substrate 10 and the explosion-proof valve 20 during the battery charging process.

[0051] It should be noted that the outer edge of the annular mounting part 111 protrudes 1mm to 10mm beyond the outer edge of the explosion-proof valve 20, including the two endpoint values ​​of 1mm and 10mm.

[0052] In one embodiment, the size of the through hole 113 is larger than the actual opening size of the explosion-proof valve 20. This setting can improve the pressure relief efficiency, so that when the battery experiences thermal runaway, the pressure can be released in time, reducing the risk of battery explosion.

[0053] See also Figures 1 to 5 As shown, in one embodiment of this utility model, the thickness of the boss 11 ranges from 2mm to 3mm.

[0054] The above settings can ensure the structural strength of the boss 11.

[0055] It should be noted that the thickness of the boss 11 ranges from 2mm to 3mm, including the two endpoints of 2mm and 3mm. That is, the thickness of the boss 11 is greater than or equal to 2mm and less than or equal to 3mm.

[0056] In one embodiment of this utility model, the boss 11 is integrally formed with the substrate 10.

[0057] According to another aspect of the present invention, the present invention also provides a power battery, comprising: the above-described cover structure; and a battery housing, wherein the cover structure is mounted on the battery housing.

[0058] In this embodiment, the cover structure of the power battery has all the technical solutions and effects of the above-mentioned cover structure, which will not be repeated here.

[0059] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: a cover plate and an explosion-proof valve are provided, a boss is provided on the substrate, the boss includes an annular mounting part and an extension part, a mounting groove is provided on one side of the annular mounting part, the explosion-proof valve is installed in the mounting groove, the annular mounting part and the extension part can strengthen the structural strength of the substrate, reduce the deformation of the substrate when the battery experiences thermal runaway, and enable the explosion-proof valve to open normally according to the specified pressure threshold, effectively reducing the risk of battery explosion.

[0060] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cover plate structure, characterized in that, include: A substrate (10) having a boss (11) comprising an annular mounting portion (111) and an extension portion (112). The annular mounting portion (111) has a through hole (113) and a mounting groove (114) on one side. The extension portion (112) is disposed on the outer periphery of the annular mounting portion (111), with a first end connected to the annular mounting portion (111) and a second end extending away from the annular mounting portion (111). An explosion-proof valve (20) is installed in the mounting groove (114) and covers the through hole (113).

2. The cover plate structure according to claim 1, characterized in that, The second end of the extension (112) extends along the width direction of the substrate (10).

3. The cover plate structure according to claim 2, characterized in that, There are two extensions (112), which are disposed on opposite sides of the annular mounting portion (111) along the width direction of the substrate (10).

4. The cover plate structure according to claim 2, characterized in that, The distance between the end of the second end of the extension (112) and the long side of the substrate (10) on the side where it is located is L1, and the value of L1 is in the range of 1mm≤L1≤30mm.

5. The cover plate structure according to any one of claims 1 to 4, characterized in that, The width W of the extension (112) is in the range of 2mm ≤ W ≤ 5mm.

6. The cover plate structure according to any one of claims 1 to 4, characterized in that, The cover plate structure also includes a protective film (30), the top surface of the annular mounting part (111) is a plane, the protective film (30) is bonded to the plane, and the outer edge of the plane protrudes beyond the outer edge of the protective film (30).

7. The cover plate structure according to claim 6, characterized in that, The distance between the plane and the surface of the substrate (10) on the side away from the explosion-proof valve (20) is L2, and the value of L2 is in the range of 0.5mm≤L2≤3mm.

8. The cover plate structure according to any one of claims 1 to 4, characterized in that, The mounting groove (114) is configured to fit the explosion-proof valve (20), and the outer edge of the annular mounting portion (111) protrudes 1 mm to 10 mm beyond the outer edge of the explosion-proof valve (20).

9. The cover plate structure according to any one of claims 1 to 4, characterized in that, The thickness of the boss (11) is in the range of 2mm to 3mm; and / or, the boss (11) is integrally formed with the substrate (10).

10. A power battery, characterized in that, include: The cover plate structure according to any one of claims 1 to 9; as well as A battery housing, wherein the cover structure is mounted on the battery housing.

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