High-stability explosion-proof valve structure and battery top cover structure

Abstract

The utility model provides a high-stability explosion-proof valve structure and a battery top cover structure, and belongs to the field of new energy batteries. The structure comprises a top cover, an anti-explosion valve and lower plastic, the anti-explosion valve comprises a first plane, a second plane and a connecting face, the first plane is parallel to the second plane, the second plane is annular, the first plane protrudes upwards out of the second plane, the connecting face is obliquely arranged between the first plane and the second plane, and a trapezoidal hole matched with the anti-explosion valve is formed in the top cover. The lower plastic is arranged at the bottom of the anti-explosion valve, and the anti-explosion valve is clamped between the top cover and the lower plastic. By adopting the high-stability explosion-proof valve structure and the battery top cover structure provided by the embodiment of the utility model, the problem of lower safety caused by difficulty in breaking in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, in particular to a high-stability explosion-proof valve structure and a battery top cover structure. Background Art

[0002] The new energy battery industry is currently booming, and its safety has also attracted much attention. As the last line of defense for battery cell safety, the explosion stability of explosion-proof valves is particularly important. However, due to the low strength of the explosion-proof valve itself, the explosion value will be affected by many factors, resulting in failure to explode in time and causing safety accidents.

[0003] The explosion-proof valve in the existing technology is usually set parallel and tightly to the top cover. At the end of the battery cell's life or when thermal runaway such as an internal short circuit occurs, the top cover will deform due to the increase in internal air pressure. The synchronous explosion-proof valve will deform due to the deformation of the top cover, resulting in a small change in the angle between the explosion-proof valve and the top cover, causing the shear force to approach zero, making it difficult for the explosion-proof valve to explode.

[0004] The explosion-proof valve in the prior art is difficult to blast, resulting in low safety. Utility Model Content

[0005] The present invention provides a highly stable explosion-proof valve structure and a battery cover structure, which can solve the problem of low safety caused by the difficulty of explosion in the prior art. The technical solution is as follows:

[0006] In the first aspect, a high-stability explosion-proof valve structure includes: a top cover, an explosion-proof valve and a lower plastic.

[0007] The explosion-proof valve includes a first plane, a second plane and a connecting surface. The first plane is parallel to the second plane, the second plane is annular, the first plane protrudes upward from the second plane, and the connecting surface is obliquely arranged between the first plane and the second plane. A trapezoidal hole matching the explosion-proof valve is opened on the top cover. The lower plastic is arranged at the bottom of the explosion-proof valve, and the explosion-proof valve is clamped between the top cover and the lower plastic.

[0008] Optionally, the top cover is provided with a horizontal installation groove matching the second plane, and the horizontal installation groove is communicated with the trapezoidal hole.

[0009] Optionally, a cavity is provided between the lower plastic and the explosion-proof valve, and an air hole is provided at the bottom of the cavity.

[0010] Optionally, a plurality of air holes are provided, and the plurality of air holes are evenly arranged at the bottom of the cavity.

[0011] Optionally, an aluminum sheet is provided on the top cover, and the aluminum sheet cover is provided on the top of the trapezoidal hole.

[0012] Optionally, a notch is provided on the first plane.

[0013] Optionally, the distance between the first plane and the second plane is 0.5 mm-2 mm.

[0014] In a second aspect, a battery top cover structure includes the aforementioned high-stability explosion-proof valve structure and also includes a liquid injection hole.

[0015] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0016] The embodiment of the present invention provides a high-stability explosion-proof valve structure and a battery top cover structure, in which the explosion-proof valve is arranged in the form of a first plane, a second plane and a connecting surface. The first plane protrudes from the second plane and is connected through the connecting surface, so that the explosion-proof valve forms a boss structure. The first plane and the connecting surface of the explosion-proof valve are installed in conjunction with the trapezoidal hole, and then the lower plastic and the top cover are installed from the bottom, so that the top cover and the lower plastic clamp and fix the explosion-proof valve. When a fault occurs inside the battery and the air pressure increases, the air pressure can generate an impact force along the inclined connecting surface to the first plane. Even if the top cover is deformed, it can provide longitudinal shear force, so that the explosion-proof valve can be successfully exploded, which can effectively solve the problem of low safety caused by explosion difficulty in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure provided by an embodiment of the present utility model;

[0019] Figure 2 The embodiment of the present utility model provides Figure 1 A magnified schematic diagram of .

[0020] In the figure: 1-top cover; 11-trapezoidal hole; 12-horizontal mounting slot; 2-explosion-proof valve; 21-first plane; 211-notch; 22-second plane; 23-connecting surface; 3-lower plastic; 31-cavity; 32-air hole; 4-liquid injection hole; 5-aluminum sheet. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided by an embodiment of the present utility model; Figure 2 The embodiment of the present utility model provides Figure 1 A is an enlarged schematic diagram. Figures 1 to 2 The figure shows a high-stability explosion-proof valve structure, comprising: a top cover 1, an explosion-proof valve 2 and a lower plastic 3. The explosion-proof valve 2 includes a first plane 21, a second plane 22 and a connecting surface 23. The first plane 21 and the second plane 22 are parallel, the second plane 22 is annular, the first plane 21 protrudes upward from the second plane 22, and the connecting surface 23 is obliquely arranged between the first plane 21 and the second plane 22. A trapezoidal hole 11 matching the explosion-proof valve 2 is opened on the top cover 1. The lower plastic 3 is arranged at the bottom of the explosion-proof valve 2, and the explosion-proof valve 2 is clamped between the top cover 1 and the lower plastic 3.

[0023] For example, in an embodiment of the present invention, the explosion-proof valve 2 is composed of a first plane 21, a second plane 22 and a connecting surface 23. The first plane 21 and the second plane 22 are parallel, and the connecting surface 23 is inclined so that the explosion-proof valve 2 forms a boss structure. A trapezoidal hole 11 is provided on the top cover 1. The explosion-proof valve 2 is installed upward from the bottom of the top cover 1, and then the lower plastic 3 is installed from the bottom of the explosion-proof valve 2 to fit the top cover 1, so that the lower plastic 3 and the top cover 1 clamp the explosion-proof valve 20. When the battery at the bottom of the explosion-proof valve 2 fails, the internal air pressure of the battery increases, and the explosion-proof valve 2 is subjected to the air pressure from the bottom battery. The air pressure generates a thrust on the first plane 21 through the inclined connecting surface 23 of the explosion-proof valve 2. When the explosion-proof valve 2 is deformed due to the deformation of the top cover 1, it can also provide a certain longitudinal shear force to ensure that the explosion-proof valve 2 explodes in time. Compared with the traditional technology, the explosion-proof valve and the top cover are set in parallel and close contact. At the end of the life of the battery cell or when thermal runaway such as an internal short circuit occurs, the top cover will be deformed due to the increase in internal air pressure. The synchronous explosion-proof valve will be deformed due to the deformation of the top cover, resulting in a small change in the angle between the explosion-proof valve and the top cover, resulting in the shear force being close to zero, which makes it difficult for the explosion-proof valve to explode. The explosion-proof valve structure in the embodiment of the utility model increases the longitudinal shear force by setting the explosion-proof valve 2 as a boss structure, so that the explosion-proof valve 2 can explode stably.

[0024] The embodiment of the present invention provides a high-stability explosion-proof valve structure, in which the explosion-proof valve 2 is arranged in the form of a first plane 21, a second plane 22 and a connecting surface 23. The first plane 21 protrudes from the second plane 22 and is connected by the connecting surface 23, so that the explosion-proof valve 2 forms a boss structure. The first plane 21 and the connecting surface 23 of the explosion-proof valve 2 are installed in conjunction with the trapezoidal hole, and then the lower plastic 3 and the top cover 1 are installed from the bottom, so that the top cover 1 and the lower plastic 3 clamp and fix the explosion-proof valve 2. When a fault occurs inside the battery and the air pressure increases, the air pressure can generate an impact force on the first plane 21 along the inclined connecting surface 23. Even if the top cover 1 is deformed, it can provide a longitudinal shear force, so that the explosion-proof valve 2 can be successfully exploded, which can effectively solve the problem of low safety caused by explosion difficulty in the prior art.

[0025] Optionally, the top cover 1 is provided with a horizontal installation groove 12 matching the second plane 22 , and the horizontal installation groove 12 is communicated with the trapezoidal hole 11 .

[0026] For example, in an embodiment of the present invention, by setting a horizontal mounting groove 12 to cooperate with the second plane 22, the explosion-proof valve 2 can be installed more closely with the top cover 1 to prevent the explosion-proof valve 2 from shaking, thereby reducing the longitudinal shear force and making it difficult to explode. By setting the horizontal mounting groove 12, the stability of the explosion-proof valve structure is improved.

[0027] Optionally, a cavity 31 is provided between the lower plastic 3 and the explosion-proof valve 2 , and an air hole 32 is provided at the bottom of the cavity 31 .

[0028] For example, in an embodiment of the present invention, a cavity 31 is provided between the explosion-proof valve 2 and the lower plastic 3, and an air hole 32 is provided at the bottom of the cavity 31. Gas generated when a battery abnormality occurs can enter the cavity 31 through the air hole 32 and accumulate pressure in the cavity 31. When a certain pressure is reached, the explosion-proof valve 2 will explode. By providing the cavity 31, the explosion-proof valve 2 will not explode until a certain amount of gas is collected in the cavity 31 and a certain pressure is reached, thereby preventing the explosion-proof valve from accidentally exploding and causing battery failure. By providing the cavity 31 and the air hole 32, the stability of the explosion-proof valve structure is further improved.

[0029] Optionally, a plurality of air holes 32 are provided, and the plurality of air holes 32 are evenly arranged at the bottom of the cavity 31 .

[0030] For example, in an embodiment of the present invention, by providing a plurality of air holes 32, the gas generated inside the battery can enter the cavity 31 more evenly and quickly, so that the explosion-proof valve 2 can respond more sensitively to changes in the gas inside the battery. When a large amount of gas is generated due to an internal failure of the battery, the explosion-proof valve 2 can explode in time, further improving the stability of the explosion-proof valve structure.

[0031] Optionally, an aluminum sheet 5 is provided on the top cover 1 , and the aluminum sheet 5 covers the top of the trapezoidal hole 11 .

[0032] For example, in an embodiment of the present invention, an aluminum sheet 5 is further provided on the top cover 1. The aluminum sheet 5 is covered on the top of the trapezoidal hole 11 to prevent dust or foreign matter from passing through the trapezoidal hole 11 and contacting the explosion-proof valve 2 to produce adverse effects. At the same time, by providing the aluminum sheet 5, the trapezoidal hole 11 is covered, making the appearance more beautiful.

[0033] Optionally, a notch 211 is provided on the first plane 21 .

[0034] For example, in an embodiment of the present invention, by setting a notch 211 on the first plane 21, when the explosion-proof valve 2 explodes, the explosion can occur along the shape of the notch 211 to produce a gap without the need to explode the entire explosion-proof valve 2, so that the damage to the top cover 1 when the explosion occurs is smaller, and it is convenient to subsequently recover the entire battery structure and analyze the cause of the battery failure.

[0035] Optionally, the distance between the first plane 21 and the second plane 22 is 0.5 mm-2 mm.

[0036] For example, in an embodiment of the present invention, after a large number of experiments, it was found that by setting the distance between the first plane 21 and the second plane 22 to 0.5mm-2mm, that is, the overall height of the explosion-proof valve 2 is 0.5mm-2mm, the explosion-proof valve 2 can be made more stably, thereby further improving the stability of the explosion-proof valve structure.

[0037] A battery top cover structure includes the aforementioned high-stability explosion-proof valve structure and also includes a liquid injection hole.

[0038] For example, in an embodiment of the present invention, by opening a liquid injection hole 4 on the top cover 1, it is convenient to inject electrolyte into the interior of the battery after the top cover 1 and the battery cell are installed. After the injection is completed, the liquid injection hole 4 is sealed to form a closed space inside the battery again. By providing the liquid injection hole 4, the operational convenience of the battery top cover structure is improved.

[0039] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present invention belongs. The terms "first", "second" and similar words used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high stability explosion-proof valve structure, characterized in that: include: Top cover (1), explosion-proof valve (2) and lower plastic (3), The explosion-proof valve (2) comprises a first plane (21), a second plane (22) and a connecting surface (23), wherein the first plane (21) and the second plane (22) are parallel, the second plane (22) is annular, the first plane (21) is protruded upward from the second plane (22), and the connecting surface (23) is obliquely arranged between the first plane (21) and the second plane (22), the top cover (1) is provided with a trapezoidal hole (11) matching the explosion-proof valve (2), the lower plastic (3) is arranged at the bottom of the explosion-proof valve (2), and the explosion-proof valve (2) is clamped between the top cover (1) and the lower plastic (3).

2. The high stability explosion-proof valve structure according to claim 1, characterized in that: The top cover (1) is provided with a horizontal installation groove (12) matching the second plane (22), and the horizontal installation groove (12) is connected to the trapezoidal hole (11).

3. The high stability explosion-proof valve structure according to claim 1, characterized in that: A cavity (31) is provided between the lower plastic (3) and the explosion-proof valve (2), and an air hole (32) is provided at the bottom of the cavity (31).

4. The high stability explosion-proof valve structure according to claim 3, characterized in that: A plurality of air holes (32) are provided, and the plurality of air holes (32) are evenly arranged at the bottom of the cavity (31).

5. The high stability explosion-proof valve structure according to claim 1, characterized in that: An aluminum sheet (5) is provided on the top cover (1), and the aluminum sheet (5) is covered on the top of the trapezoidal hole (11).

6. The high stability explosion-proof valve structure according to claim 1, characterized in that: The first plane (21) is provided with a notch (211).

7. The high stability explosion-proof valve structure according to claim 1, characterized in that: The distance between the first plane (21) and the second plane (22) is 0.5 mm to 2 mm.

8. A battery top cover structure, comprising the high-stability explosion-proof valve structure according to any one of claims 1 to 7, and further comprising a liquid injection hole (4).

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