Explosion-proof valve and battery

Abstract

The explosion-proof valve comprises an explosion-proof valve body, the explosion-proof valve body is provided with an inner side face facing one side of a battery cell and an outer side face deviating from one side of the battery cell, and the outer side face is provided with a first micro-nano structure layer. According to the explosion-proof valve disclosed by the embodiment of the utility model, the explosion-proof valve body is provided with the outer side surface deviating from one side of the battery cell, the first micro-nano structure layer is arranged on the outer side surface, and the first micro-nano structure layer has excellent hydrophobic performance and electrolyte hydrophobic performance; the electrolyte can quickly fall off from the first micro-nano structure layer, so that the electrolyte can be prevented from infiltrating into the explosion-proof valve body and corroding the explosion-proof valve body; and meanwhile, the procedure of covering a protective film outside the anti-explosion valve can be omitted, and the production cost is reduced.

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] The battery top cover is an important component to ensure the safety of the battery cell. An explosion-proof valve is generally installed on the battery cover. On the outside of the battery, the electrolyte can easily come out of the filling hole during the battery filling and pre-charging process, contaminating 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 on the outside of the battery and avoid corrosion and contamination of the electrolyte. However, this method will increase the cost of the battery top cover. Summary of the invention

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an explosion-proof valve, wherein a first micro-nano structure layer is provided on the outer side of the explosion-proof valve body, and the first micro-nano structure layer has high-quality hydrophobicity and electrolyte repellency, which can prevent the electrolyte from infiltrating into the explosion-proof valve body; at the same time, the process of covering the outside of the explosion-proof valve with a protective film can be omitted, thereby reducing production costs.

[0005] The utility model also provides a battery with the explosion-proof valve.

[0006] According to the first aspect of the present invention, the explosion-proof valve comprises an explosion-proof valve body having an inner side facing a battery core and an outer side facing away from the battery core, wherein the outer side is provided with a first micro-nano structure layer.

[0007] According to the explosion-proof valve of the embodiment of the utility model, the explosion-proof valve includes an explosion-proof valve body, the explosion-proof valve body has an outer side surface facing away from the side of the battery core, and a first micro-nano structure layer is arranged on the outer side surface. The first micro-nano structure layer has high-quality hydrophobic properties and electrolyte repellent properties. When the electrolyte contacts the first micro-nano structure layer, the electrolyte can quickly fall off the first micro-nano structure layer, which can prevent the electrolyte from infiltrating into the explosion-proof valve body and preventing the electrolyte from corroding the explosion-proof valve body; at the same time, the process of covering the outside of the explosion-proof valve with a protective film can be omitted, thereby reducing production costs.

[0008] According to some embodiments of the present invention, a second micro-nano structure layer is disposed on the inner side surface.

[0009] According to some embodiments of the present invention, the first micro-nano structure layer and / or the second micro-nano structure layer are formed by etching the explosion-proof valve body.

[0010] According to some embodiments of the present invention, explosion-proof notches are provided on the outer periphery of the outer side surface.

[0011] According to some embodiments of the present invention, the explosion-proof notch is in a ring shape surrounding the outer periphery of the explosion-proof valve body.

[0012] According to some embodiments of the utility model, a reinforcing rib is arranged on the outer side surface, and the reinforcing rib is located on the inner side of the annular explosion-proof notch and is connected to the explosion-proof notch.

[0013] According to some embodiments of the present invention, the reinforcing rib includes an arc-shaped first reinforcing rib and an arc-shaped second reinforcing rib, and the first reinforcing rib and the second reinforcing rib are configured in an "X" shape.

[0014] According to some embodiments of the present invention, 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°.

[0015] According to some embodiments of the present invention, the contact angle a2 between the electrolyte and the second micro-nanostructure layer satisfies: 90°≤a2≤160°, and the rolling angle b2 satisfies: 5°≤b2≤15°.

[0016] The battery according to the embodiment of the second aspect of the utility model comprises a battery shell, the battery shell comprises a battery cover, and the outer side of the battery cover is provided with an explosion-proof valve according to the embodiment of the first aspect of the utility model.

[0017] According to the battery of the embodiment of the utility model, by providing the above-mentioned explosion-proof valve, when the electrolyte contacts the first micro-nano structure layer, the electrolyte can quickly fall off the first micro-nano structure layer, which can prevent the electrolyte from infiltrating into the explosion-proof valve body and preventing the electrolyte from corroding the explosion-proof valve body, thereby improving the safety of the battery.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a battery cover according to some embodiments of the utility model;

[0021] Figure 2 is a schematic diagram of an explosion-proof valve according to some embodiments of the utility model;

[0022] Figure 3 yes Figure 2 A schematic diagram of the explosion-proof valve from another angle;

[0023] Figure 4 is a schematic diagram of the contact angle between the electrolyte and the first micro-nano structure layer according to some embodiments of the utility model;

[0024] Figure 5 is a schematic diagram of the rolling angle between the electrolyte and the first micro-nano structure layer according to some embodiments of the utility model;

[0025] Figure 6 is a schematic diagram of the contact angle between the electrolyte and the second micro-nano structure layer according to some embodiments of the utility model;

[0026] Figure 7 It is a schematic diagram of the rolling angle between the electrolyte and the second micro-nano structure layer according to some embodiments of the utility model.

[0027] Reference numerals:

[0028] 100. Battery cover;

[0029] 10. Explosion-proof valve; 1. Explosion-proof valve body; 11. Outer side surface; 111. First micro-nano structure layer; 112. Explosion-proof notch; 113. Reinforcement rib; 114. First reinforcement rib; 115. Second reinforcement rib; 12. Inner side surface; 121. Second micro-nano structure layer. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] Reference below Figure 1-Figure 7 An explosion-proof valve 10 according to an embodiment of the present invention is described.

[0034] Reference Figure 1-Figure 3 According to the explosion-proof valve 10 of the first embodiment of the utility model, the explosion-proof valve body 1 includes an explosion-proof valve body 1, the explosion-proof valve body 1 has an inner side 12 and an outer side 11, the inner side 12 is a side facing the battery core, the outer side 11 is a side away from the battery core, and the outer side 11 is provided with a first micro-nano structure layer 111. For example, the outer side 11 of the explosion-proof valve body 1 can be processed by laser micro-nano processing to form the first micro-nano structure layer 111 on the outer side 11 of the explosion-proof valve body 1. The above-mentioned laser can be a picosecond pulse laser, a femtosecond pulse laser, or a nanosecond pulse laser. In the utility model, the picosecond pulse laser is preferably used to process the outer side 11 of the explosion-proof valve body 1.

[0035] The outer side surface 11 of the explosion-proof valve body 1 is processed by laser micro-nano processing, and a micron-scale groove structure and a grid-like groove structure with a straight texture can be processed on the outer side surface 11 of the explosion-proof valve body 1. The micron-scale groove structure with a straight texture and the grid-like groove structure have excellent hydrophobic properties and electrolyte repellent properties.

[0036] The first micro-nano structure layer 111 has excellent hydrophobicity and electrolyte repellency. When the electrolyte contacts the first micro-nano structure layer 111, the electrolyte can form droplets and can quickly fall off from the first micro-nano structure layer 111, which can prevent the electrolyte from infiltrating into the explosion-proof valve body 1 and corroding the explosion-proof valve body 1. Compared with the related art, the utility model can save the process of covering the outside of the explosion-proof valve 10 with a protective film, which can reduce the production cost.

[0037] According to the explosion-proof valve 10 of the embodiment of the utility model, the explosion-proof valve 10 includes an explosion-proof valve body 1, the explosion-proof valve body 1 has an outer side surface 11 facing away from the side of the battery core, and a first micro-nano structure layer 111 is arranged on the outer side surface 11. The first micro-nano structure layer 111 has high-quality hydrophobic properties and electrolyte repellent properties. When the electrolyte contacts the first micro-nano structure layer 111, the electrolyte can quickly fall off the first micro-nano structure layer 111, which can prevent the electrolyte from infiltrating into the explosion-proof valve body 1 and preventing the electrolyte from corroding the explosion-proof valve body 1; at the same time, the process of covering the outside of the explosion-proof valve 10 with a protective film can be omitted, which can reduce the production cost.

[0038] According to some embodiments of the present invention, referring to Figure 1-Figure 3 , the inner side 12 of the explosion-proof valve body 1 is provided with a second micro-nano structure layer 121, and the second micro-nano structure layer 121 is formed in the same way as the first micro-nano structure layer 111. The inner side 12 of the explosion-proof valve body 1 is the side facing the battery core. Inside the battery, there is no isolation between the explosion-proof valve 10 and the electrolyte, and the electrolyte is easy to contact with the explosion-proof valve 10 and corrode the explosion-proof valve 10. A second micro-nano structure layer 121 is provided on the inner side 12, and the second micro-nano structure layer 121 has high-quality hydrophobic properties and electrolyte repellent properties. When the electrolyte contacts the second micro-nano structure layer 121, the electrolyte can form droplets, and the electrolyte can quickly fall off the second micro-nano structure layer 121, which can prevent the electrolyte from infiltrating into the explosion-proof valve body 1 and corroding the explosion-proof valve body 1.

[0039] For example, the inner side surface 12 of the explosion-proof valve 10 can be processed by laser micro-nano processing to form a second micro-nano structure layer 121 on the inner side surface 12 of the explosion-proof valve 10. The laser can be a picosecond pulse laser, a femtosecond pulse laser, or a nanosecond pulse laser. In the present invention, the inner side surface 12 of the explosion-proof valve body 1 is preferably processed by a picosecond pulse laser.

[0040] The inner side surface 12 of the explosion-proof valve body 1 is processed by laser micro-nano processing, and a micron-scale groove structure and a grid-like groove structure with a straight texture can be processed on the inner side surface 12 of the explosion-proof valve body 1. The micron-scale groove structure with a straight texture and the grid-like groove structure have excellent hydrophobic properties and electrolyte repellent properties.

[0041] According to some embodiments of the present invention, referring to Figure 1-Figure 3 The first micro-nano structure layer 111 is formed by etching the explosion-proof valve body 1; or, the second micro-nano structure layer 121 is formed by etching the explosion-proof valve body 1; or, the first micro-nano structure layer 111 and the second micro-nano structure layer 121 are both formed by etching the explosion-proof valve body 1; the process of processing the first micro-nano structure layer 111 and the second micro-nano structure layer 121 can be simple, low-cost, and no other structures need to be added.

[0042] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The outer periphery of the outer side surface 11 is provided with an explosion-proof notch 112, and the explosion-proof notch 112 of the explosion-proof valve 10 is a weak area of ​​the explosion-proof valve 10. When the internal pressure of the battery is too high, the pressure will impact the explosion-proof valve 10, and the explosion-proof valve 10 will open from the explosion-proof notch 112 to automatically release the pressure to prevent explosion.

[0043] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The explosion-proof notch 112 is a ring shape surrounding the outer periphery of the explosion-proof valve body 1. When the internal pressure of the battery is too high, the pressure will impact the explosion-proof valve 10. The explosion-proof valve 10 automatically opens from the outer periphery of the explosion-proof valve body 1 to release pressure, which can make the explosion-proof valve body 1 open in a larger area and facilitate quick pressure release.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The outer side surface 11 is provided with a reinforcing rib 113, which is located on the inner side of the annular explosion-proof notch 112, and the reinforcing rib 113 is connected to the explosion-proof notch 112, and the reinforcing rib 113 extends to the explosion-proof notch 112, which can increase the structural strength of the outer periphery of the explosion-proof valve body 1. The reinforcing rib 113 can increase the structural strength of the explosion-proof valve body 1, and prevent the explosion-proof valve 10 from being damaged when it is bumped by the outside.

[0045] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The reinforcing ribs 113 include arc-shaped first reinforcing ribs 114 and arc-shaped second reinforcing ribs 115, and the first reinforcing ribs 114 and the second reinforcing ribs 115 are configured in an "X" shape, so that the first reinforcing ribs 114 and the second reinforcing ribs 115 can better increase the structural strength of the explosion-proof valve body 1. For example, the first reinforcing ribs 114 and the second reinforcing ribs 115 can extend on the entire outer side 11 of the explosion-proof valve body 1.

[0046] According to some embodiments of the present invention, referring to Figure 4-Figure 5 The contact angle a1 between the electrolyte and the first micro-nano structure layer 111 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 111. 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 111 has high-quality hydrophobicity and electrolyte repellency.

[0047] For example, the contact angle a1 between the electrolyte and the first micro-nanostructure layer 111 can be: 90°, 120°, 150°, 153° or 160°; in actual use, the contact angle a1 between the electrolyte and the first micro-nanostructure layer 111 is 153°, and the first micro-nanostructure layer 111 is in a superhydrophobic state.

[0048] The rolling angle b1 between the electrolyte and the first micro-nano structure layer 111 satisfies: 5°≤b1≤15°. The rolling angle is the critical angle formed by the inclined surface of the first micro-nano structure layer 111 and the horizontal plane when the liquid just rolls on the inclined surface of the first micro-nano structure layer 111. The smaller the rolling angle, the better the hydrophobicity. The rolling angle b1 satisfies: 5°≤b1≤15°, which proves that the first micro-nano structure layer 111 has high-quality hydrophobicity and electrolyte repellency.

[0049] For example, the rolling angle b1 between the electrolyte and the first micro-nanostructure layer 111 may be 5°, 8°, 10°, 12° or 15°. In actual use, the rolling angle b1 between the electrolyte and the first micro-nanostructure layer 111 is 8°.

[0050] According to some embodiments of the present invention, referring to Figure 6-Figure 7 The contact angle a2 between the electrolyte and the second micro-nano structure layer 121 satisfies: 90°≤a2≤160°. The contact angle is the angle formed when the liquid surface contacts the surface of the second micro-nano structure layer 121. The larger the contact angle, the better the hydrophobicity. The contact angle a2 satisfies: 90°≤a2≤160°, which proves that the second micro-nano structure layer 121 has high-quality hydrophobicity and electrolyte repellency.

[0051] For example, the contact angle a2 between the electrolyte and the second micro-nanostructure layer 121 can be: 90°, 120°, 150°, 153° or 160°; in actual use, the contact angle a2 between the electrolyte and the second micro-nanostructure layer 121 is 153°, and the second micro-nanostructure layer 121 is in a superhydrophobic state.

[0052] The rolling angle b2 between the electrolyte and the second micro-nano structure layer 121 satisfies: 5°≤b2≤15°. The rolling angle is the critical angle formed by the inclined surface of the second micro-nano structure layer 121 and the horizontal plane when the liquid just rolls on the inclined surface of the second micro-nano structure layer 121. The smaller the rolling angle, the better the hydrophobicity. The rolling angle b2 satisfies: 5°≤b2≤15°, which proves that the second micro-nano structure layer 121 has high-quality hydrophobic properties and electrolyte repellent properties.

[0053] For example, the rolling angle b2 between the electrolyte and the second micro-nanostructure layer 121 may be 5°, 8°, 10°, 12° or 15°. In actual use, the rolling angle b2 between the electrolyte and the second micro-nanostructure layer 121 is 8°.

[0054] The battery according to the second embodiment of the utility model includes a battery shell, the battery shell includes a battery cover 100, and the outer side 11 of the battery cover 100 is provided with an explosion-proof valve 10 according to the first embodiment of the utility model. For example, the explosion-proof valve 10 is welded to the outer side of the battery cover 100 by a laser welding process.

[0055] According to the battery of the embodiment of the utility model, by providing the above-mentioned explosion-proof valve 10, when the electrolyte contacts the first micro-nano structure layer 111, the electrolyte can quickly fall off the first micro-nano structure layer 111, which can prevent the electrolyte from infiltrating into the explosion-proof valve body 1 and prevent the electrolyte from corroding the explosion-proof valve body 1, thereby improving the safety of the battery.

[0056] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve, characterized in that: include: The explosion-proof valve body has an inner side surface facing a side of the battery core and an outer side surface away from a side of 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 inner side surface is provided with a second micro-nano structure layer.

3. The explosion-proof valve according to claim 2, characterized in that: The first micro-nano structure layer and / or the second micro-nano structure layer are formed by etching the explosion-proof valve body.

4. The explosion-proof valve according to claim 1, characterized in that: The outer periphery of the outer side surface is provided with explosion-proof notches.

5. The explosion-proof valve according to claim 4, characterized in that: The explosion-proof notch is in a ring shape surrounding the outer periphery of the explosion-proof valve body.

6. The explosion-proof valve according to claim 5, characterized in that: The outer surface is provided with reinforcing ribs, which are located on the inner side of the annular explosion-proof notch and are connected to the explosion-proof notch.

7. The explosion-proof valve according to claim 6, characterized in that: The reinforcing ribs include arc-shaped first reinforcing ribs and arc-shaped second reinforcing ribs, and the first reinforcing ribs and the second reinforcing ribs are configured in an "X" shape.

8. 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°.

9. The explosion-proof valve according to claim 2, characterized in that: The contact angle a2 between the electrolyte and the second micro-nanostructure layer satisfies: 90°≤a2≤160°, and the rolling angle b2 satisfies: 5°≤b2≤15°.

10. A battery, characterized in that: The invention comprises a battery shell, wherein the battery shell comprises a battery cover plate, and an explosion-proof valve according to any one of claims 1 to 9 is arranged on an outer side of the battery cover plate.

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