Explosion-proof valve and battery
By providing a first micro-nano structural layer with hydrophobic and electrolyte removal properties on the outer side of the explosion-proof valve patch, the electrolyte corrosion problem is solved and the safety of the explosion-proof valve is improved.
Patent Information
- Application Number
- CN202420222139.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-01-29
AI Technical Summary
In the prior art, the explosion-proof valve outside the battery is susceptible to corrosion and contamination by the electrolyte, which causes the safety of the explosion-proof valve to be threatened.
A first micro-nano structural layer is arranged on the outer side of the explosion-proof valve patch. This layer has high-quality hydrophobic properties and electrolyte removal properties, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch.
Through the design of the first micro-nano structural layer, the electrolyte can quickly fall off to avoid corrosion of the explosion-proof valve patch, thereby improving the safety of the explosion-proof valve.
Smart Images
Figure CN222915054U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve and a battery. Background Art
[0002] As an important part to ensure the safety of the battery core, an explosion-proof valve is generally provided on the battery cover plate. Outside the battery, during the battery liquid injection and pre-charging processes, the electrolyte is very likely to overflow from the liquid injection hole, polluting and corroding the explosion-proof valve.
[0003] In the related art, a layer of explosion-proof valve protection plastic sheet is covered on the outside of the explosion-proof valve to increase the protection of the explosion-proof valve in the external part of the battery through the plastic sheet, avoiding the corrosion and pollution of the electrolyte. However, the electrolyte will still corrode the plastic sheet in this method. In the long run, the explosion-proof valve will also be corroded. Content of the Utility Model
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide an explosion-proof valve. A first micro-nano structure layer is arranged on the outer side surface of the patch body. The first micro-nano structure layer has excellent hydrophobic performance and electrolyte-repellent performance, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch, improve the safety of the explosion-proof valve patch, and further improve the safety of the explosion-proof valve.
[0005] The utility model also provides a battery with the above explosion-proof valve.
[0006] The explosion-proof valve according to the first aspect embodiment of the utility model includes: an explosion-proof valve body; an explosion-proof valve patch, the explosion-proof valve patch is arranged on the outside of the explosion-proof valve body. The explosion-proof valve patch includes a patch body. The patch body has an outer side surface facing away from the battery core, and the outer side surface is provided with a first micro-nano structure layer.
[0007] For the explosion-proof valve according to the embodiment of the utility model, the explosion-proof valve patch includes a patch body, and a first micro-nano structure layer is arranged on the outer side surface of the patch body. The first micro-nano structure layer has excellent hydrophobic performance and electrolyte-repellent performance. When the electrolyte contacts the first micro-nano structure layer, the electrolyte can quickly fall off from the first micro-nano structure layer, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch, avoid the electrolyte from corroding the explosion-proof valve patch, improve the safety of the explosion-proof valve patch, and further improve the safety of the explosion-proof valve.
[0008] According to some embodiments of the utility model, the first micro-nano structure layer is etched from the patch body.
[0009] According to some embodiments of the utility model, the first micro-nano structure layer is in a micron-level groove structure.
[0010] According to some embodiments of the present utility model, the first micro-nano structure layer has a grid-shaped groove structure.
[0011] According to some embodiments of the present utility model, the patch body is an integrally formed plastic part.
[0012] According to some embodiments of the present utility model, the contact angle a1 between the electrolyte and the first micro-nano structure layer satisfies: 90° ≤ a1 ≤ 160°, and the rolling angle b1 satisfies: 5° ≤ b1 ≤ 15°.
[0013] According to some embodiments of the present utility model, an explosion-proof notch is provided on the outer peripheral edge of the outer surface of the explosion-proof valve body.
[0014] According to some embodiments of the present utility model, reinforcing ribs are provided on the explosion-proof valve body, the reinforcing ribs are located inside the explosion-proof notch and are connected to the explosion-proof notch.
[0015] The battery according to the second aspect embodiment of the present utility model includes: a battery case, the battery case includes a battery cover plate, and the battery cover plate is provided with an explosion-proof valve according to the above first aspect embodiment of the present utility model.
[0016] According to the battery of the embodiment of the present utility model, by providing the above explosion-proof valve, when the electrolyte contacts the first micro-nano structure layer, the electrolyte can quickly fall off from the first micro-nano structure layer, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch and avoid the electrolyte from corroding the explosion-proof valve, thereby improving the safety of the battery.
[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:
[0019] Figure 1 is a schematic diagram of a battery cover plate according to some embodiments of the present utility model;
[0020] Figure 2 is a schematic diagram of an explosion-proof valve patch according to some embodiments of the present utility model;
[0021] Figure 3 is a schematic diagram of the contact angle between the electrolyte and the first micro-nano structure layer according to some embodiments of the present utility model;
[0022] Figure 4 is a schematic diagram of the rolling angle between the electrolyte and the first micro-nano structure layer according to some embodiments of the present utility model;
[0023] Figure 5 is a schematic diagram of the first micro-nano structure layer with a micron-scale groove structure according to some embodiments of the present utility model;
[0024] Figure 6 is a schematic diagram of the first micro-nano structure layer with a grid-shaped groove structure according to some embodiments of the present utility model.
[0025] Reference numerals:
[0026] 100, battery cover plate;
[0027] 10, explosion-proof valve; 1, explosion-proof valve body; 11, explosion-proof notch; 12, reinforcing rib; 121, first reinforcing rib; 122, second reinforcing rib;
[0028] 20, explosion-proof valve patch; 2, patch body; 21, outer side surface; 211, first micro-nano structure layer. Detailed implementation manners
[0029] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.
[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.
[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0032] Reference is made below to Figures 1 - 6 describe the explosion-proof valve patch 20 according to an embodiment of the present utility model.
[0033] Referring to Figures 1 - 2 , the explosion-proof valve patch 20 according to the first aspect embodiment of the present utility model includes a patch body 2. The patch body 2 has an outer side surface 21, and the outer side surface 21 is the side of the patch body 2 facing away from the battery cell. A first micro-nano structure layer 211 is provided on the outer side surface 21. For example, the outer side surface 21 of the patch body 2 can be processed by laser micro-nano processing to form the first micro-nano structure layer 211 on the outer side surface 21 of the patch body 2. The above-mentioned laser can be a picosecond pulsed laser, a femtosecond pulsed laser, or a nanosecond pulsed laser. In the present utility model, a picosecond pulsed laser is preferably used to process the outer side surface 21 of the patch body 2.
[0034] For example, by processing the outer side surface 21 of the explosion-proof valve patch 20 by laser micro-nano processing, a micron-level groove structure with linear texture and a grid-like groove structure can be processed on the outer side surface 21 of the explosion-proof valve patch 20. The micron-level groove structure with linear texture and the grid-like groove structure have excellent hydrophobic and electrolyte-repellent properties.
[0035] The first micro-nano structure layer 211 has excellent hydrophobic and electrolyte-repellent properties. When the electrolyte contacts the first micro-nano structure layer 211, the electrolyte can form droplets and can quickly fall off from the first micro-nano structure layer 211, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch 20 and corroding the explosion-proof valve patch 20, thereby improving the safety of the explosion-proof valve patch 20.
[0036] According to the explosion-proof valve patch 20 of the embodiment of the present utility model, the explosion-proof valve patch 20 includes a patch body 2, and a first micro-nano structure layer 211 is provided on the outer side surface 21 of the patch body 2. The first micro-nano structure layer 211 has excellent hydrophobic and electrolyte-repellent properties. When the electrolyte contacts the first micro-nano structure layer 211, the electrolyte can quickly fall off from the first micro-nano structure layer 211, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch 20, avoid the electrolyte from corroding the explosion-proof valve patch 20, improve the safety of the explosion-proof valve patch 20, and further improve the safety of the explosion-proof valve 10.
[0037] According to some embodiments of the present utility model, with reference to Figures 1 - 2 , the first micro-nano structure layer 211 is etched from the patch body 2, which can make the process of processing the first micro-nano structure layer 211 simple and low-cost, and no other structures need to be added.
[0038] According to some embodiments of the present utility model, with reference to Figures 1 - 2 、 Figure 5 , the first micro-nano structure layer 211 has a micron-level groove structure. Specifically, the first micro-nano structure layer 211 has a micron-level groove structure with straight textures. The micron-level groove structure can make the outer side surface 21 of the patch body 2 have excellent hydrophobic and electrolyte-repellent properties, so that the outer side surface 21 of the patch body 2 is not corroded and infiltrated by the electrolyte.
[0039] According to some embodiments of the present utility model, with reference to Figures 1 - 2 、 Figure 6 , the first micro-nano structure layer 211 has a grid-like groove structure. The grid-like groove structure can make the outer side surface 21 of the patch body 2 have excellent hydrophobic and electrolyte-repellent properties, so that the outer side surface 21 of the patch body 2 is not corroded and infiltrated by the electrolyte.
[0040] According to some embodiments of the present utility model, with reference to Figures 1 - 2 , the patch body 2 is an integrally formed plastic part, which can make the processing cost of the patch body 2 relatively low. For example, the patch body 2 can be composed of a variety of plastic materials, including but not limited to: plastic materials such as PE, PC, and PET.
[0041] According to some embodiments of the present utility model, with reference to Figure 3 , the contact angle a1 between the electrolyte and the first micro-nano structure layer 211 satisfies: 90°≤a1≤160°. The contact angle is the angle formed when the liquid surface contacts the surface of the first micro-nano structure layer 211. The larger the contact angle, the better the hydrophobicity. The contact angle a1 satisfies: 90°≤a1≤160°, which proves that the first micro-nano structure layer 211 has excellent hydrophobic and electrolyte-repellent properties.
[0042] For example, the contact angle α1 between the electrolyte and the first micro-nano structure layer 211 can be: 90°, 120°, 145°, 153° or 160°; during actual use, the contact angle α1 between the electrolyte and the first micro-nano structure layer 211 is 145°, and the first micro-nano structure layer 211 is in a superhydrophobic state.
[0043] Referring to Figure 4 , the rolling angle β1 of the electrolyte on the first micro-nano structure layer 211 satisfies: 5° ≤ β1 ≤ 15°. The rolling angle is the critical angle formed between the inclined surface of the first micro-nano structure layer 211 and the horizontal plane when the liquid just starts to roll on the inclined surface of the first micro-nano structure layer 211. The smaller the rolling angle, the better the hydrophobicity. The fact that the rolling angle β1 satisfies: 5° ≤ β1 ≤ 15° proves that the first micro-nano structure layer 211 has excellent hydrophobic and electrolyte-repellent properties.
[0044] For example, the rolling angle β1 between the electrolyte and the first micro-nano structure layer 211 can be: 5°, 8°, 10°, 12° or 15°; during actual use, the rolling angle β1 between the electrolyte and the first micro-nano structure layer 211 is 8°.
[0045] The explosion-proof valve 10 according to the second aspect embodiment of the present invention includes an explosion-proof valve body 1, and an explosion-proof valve patch 20 according to the above first aspect embodiment of the present invention is provided on the outer side of the explosion-proof valve body 1.
[0046] According to the explosion-proof valve 10 of the embodiment of the present invention, by providing the above explosion-proof valve patch 20, when the electrolyte contacts the first micro-nano structure layer 211, the electrolyte can quickly fall off from the first micro-nano structure layer 211, which can prevent the electrolyte from infiltrating into the explosion-proof valve patch 20 and avoid the electrolyte from corroding the explosion-proof valve patch 20, thereby improving the safety of the explosion-proof valve 10.
[0047] According to some embodiments of the present invention, referring to Figure 1 , an explosion-proof notch 11 is provided on the outer peripheral edge of the outer surface of the explosion-proof valve body 1, and the explosion-proof notch 11 is a weak area of the explosion-proof valve body 1. When the pressure of the gas inside the battery is too high, the gas will impact the explosion-proof valve body 1, and the explosion-proof valve 10 will open automatically for pressure relief from the outer peripheral edge of the explosion-proof valve body 1, which can make the opening area of the explosion-proof valve body 1 larger and is conducive to rapid pressure relief.
[0048] For example, the explosion-proof notch 11 is annular and surrounds the outer peripheral edge of the explosion-proof valve body 1. When the pressure of the gas inside the battery is too high, the gas will impact the explosion-proof valve body 1, and the explosion-proof valve body 1 will open automatically for pressure relief from the annular explosion-proof notch 11, which can make the opening area of the explosion-proof valve body 1 larger and is conducive to rapid pressure relief.
[0049] According to some embodiments of the present invention, referring to Figure 1, a reinforcing rib 12 is provided on the explosion-proof valve body 1. The reinforcing rib 12 is located inside the explosion-proof notch 11, and the reinforcing rib 12 is connected to the explosion-proof notch 11. The reinforcing rib 12 extends to the explosion-proof notch 11, which can increase the structural strength of the outer periphery of the explosion-proof valve body 1. The reinforcing rib 12 can increase the structural strength of the explosion-proof valve body 1 and prevent the explosion-proof valve 10 from being damaged when being bumped by the outside world.
[0050] For example, the reinforcing rib 12 may include an arc-shaped first reinforcing rib 121 and an arc-shaped second reinforcing rib 122. The first reinforcing rib 121 and the second reinforcing rib 122 are configured in an "X" shape. The first reinforcing rib 121 and the second reinforcing rib 122 can extend on the entire outer surface of the explosion-proof valve body 1, so that the first reinforcing rib 121 and the second reinforcing rib 122 can better increase the structural strength of the explosion-proof valve body 1.
[0051] The battery according to the third aspect embodiment of the present utility model includes: a battery case, and the battery case includes a battery cover plate 100. The battery cover plate 100 is provided with the explosion-proof valve 10 according to the second aspect embodiment of the present utility model above.
[0052] The explosion-proof valve 10 includes an explosion-proof valve patch 20 and an explosion-proof valve body 1. The explosion-proof valve patch 20 is located outside the battery cover plate 100, and the explosion-proof valve body 1 is located inside the battery cover plate 100.
[0053] For example, the explosion-proof valve body 1 is welded to the inside of the battery cover plate 100 by a laser welding process.
[0054] For the battery according to the embodiment of the present utility model, by providing the above-mentioned explosion-proof valve 10, when the electrolyte contacts the first micro-nano structure layer 211, the electrolyte can quickly fall off from the first micro-nano structure layer 211, which can avoid the electrolyte from infiltrating into the explosion-proof valve patch 20 and avoid the electrolyte from corroding the explosion-proof valve 10, thereby improving the safety of the battery.
[0055] In the description of this specification, the description with reference to terms such as "some embodiments", "optionally", "further" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0056] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.
Claims
1. An explosion-proof valve, characterized in that: include: Explosion-proof valve body; An explosion-proof valve patch is provided on the outside of the explosion-proof valve body. The explosion-proof valve patch comprises a patch body. The patch body has an outer side surface facing away from the battery core, and the outer side surface is provided with a first micro-nano structure layer.
2. The explosion-proof valve according to claim 1, characterized in that: The first micro-nano structure layer is formed by etching the patch body.
3. The explosion-proof valve according to claim 1, characterized in that: The first micro-nano structure layer has a micron-scale groove structure.
4. The explosion-proof valve according to claim 1, characterized in that: The first micro-nano structure layer has a grid-like groove structure.
5. The explosion-proof valve according to claim 1, characterized in that: The patch body is an integrally formed plastic part.
6. The explosion-proof valve according to claim 1, characterized in that: The contact angle a1 between the electrolyte and the first micro-nanostructure layer satisfies: 90°≤a1≤160°, and the rolling angle b1 satisfies: 5°≤b1≤15°.
7. The explosion-proof valve according to claim 1, characterized in that: The outer periphery of the outer surface of the explosion-proof valve body is provided with explosion-proof notches.
8. The explosion-proof valve according to claim 7, characterized in that: The explosion-proof valve body is provided with reinforcing ribs, which are located inside the explosion-proof notches and connected to the explosion-proof notches.
9. A battery, characterized in that: include: A battery shell, the battery shell comprising a battery cover plate, the battery cover plate being provided with an explosion-proof valve according to any one of claims 1-8.