Anti-explosion valve structure and battery

Abstract

The utility model discloses an explosion-proof valve structure and a battery, the explosion-proof valve structure is used for a battery top cover, the battery top cover is provided with a mounting hole, the explosion-proof valve structure comprises an explosion-proof valve and a protective patch, and the explosion-proof valve is positioned in the mounting hole; the protective patch is mounted on the battery top cover, is positioned on one side, facing the pole group, of the anti-explosion valve, is separated from the anti-explosion valve, and is provided with a through hole allowing the electrolyte to pass through. According to the anti-explosion valve structure disclosed by the embodiment of the utility model, the protective patch is arranged on one side, facing the pole group, of the anti-explosion valve, and when the battery is shaken, electrolyte can impact the protective patch, so that the electrolyte can be prevented from directly impacting the anti-explosion valve, and the service life of the anti-explosion valve is prolonged; the protective patch is provided with the through holes, on one hand, the through holes can play a buffering role when the protective patch is impacted by electrolyte, and the protective patch is prevented from falling off when the protective patch is subjected to large impact; and on the other hand, when the battery is subjected to thermal runaway, the explosion-proof valve can be ensured to be opened in time.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve structure and a battery. Background Art

[0002] In the related art, the main structures of the blade battery are: cover plate (integrated with pole, explosion-proof valve, upper plastic, lower plastic, injection hole), shell, pole group end plate, side plate, bare pole group insulation sheet, pole group, etc. After the cover plate and shell are welded, a closed space with certain mechanical strength is formed to protect the pole group; the side plate and bare pole group insulation sheet are welded and fixed to the outside of the pole group; in addition, the bare pole group insulation sheet is melted and fixed to the plastic parts of the positive and negative pole cover plates, so that the pole group is well fixed in the shell to avoid short circuit of the pole group.

[0003] However, for the side of the explosion-proof valve facing the electrode group, a cavity is formed between the end plate inside the electrode group and the explosion-proof valve, and the electrolyte will accumulate in the cavity; when the battery is shaken, the electrolyte will shake back and forth, constantly impacting the explosion-proof valve, which can easily cause damage to the explosion-proof valve, leakage of the electrode group, or even premature opening of the explosion-proof valve. Utility Model Content

[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 structure, which can not only increase the service life of the explosion-proof valve, but also better avoid the impact of electrolyte on the explosion-proof valve, and ensure that the explosion-proof valve can be opened in time.

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

[0006] According to the explosion-proof valve structure of the first aspect of the utility model, the explosion-proof valve structure is used for a battery top cover, and the battery top cover has a mounting hole. The explosion-proof valve structure comprises: an explosion-proof valve, which is located in the mounting hole; a protective patch, which is installed on the battery top cover, the protective patch is located on the side of the explosion-proof valve facing the pole group and is separated from the explosion-proof valve, and the protective patch is provided with a through hole allowing electrolyte to pass through.

[0007] According to the explosion-proof valve structure of the embodiment of the utility model, a protective patch is provided on the side of the explosion-proof valve facing the pole group. When the battery is shaken, the electrolyte will impact the protective patch, which can prevent the electrolyte from directly impacting the explosion-proof valve and increase the service life of the explosion-proof valve; a through hole is provided on the protective patch, which, on the one hand, can play a buffering role when the electrolyte impacts the protective patch and prevent the protective patch from falling off when it is subjected to a large impact; on the other hand, when the battery has thermal runaway, it can ensure that the explosion-proof valve can open in time.

[0008] According to some embodiments of the present invention, the explosion-proof valve includes an explosion-proof valve body and a mounting seat connected to the outer periphery of the explosion-proof valve body, and in the thickness direction of the battery top cover, the through hole and the mounting seat are arranged opposite to each other.

[0009] According to some embodiments of the present invention, in a projection plane perpendicular to the thickness direction of the battery top cover, the projection of the through hole is located outside the projection of the explosion-proof valve body.

[0010] According to some embodiments of the utility model, in a projection plane perpendicular to the thickness direction of the battery top cover, a straight line passing through the center of any through hole is a first straight line, and the first straight line extends from the explosion-proof valve body to the through hole. In the first straight line, the dimension from the inner periphery of the mounting seat to the outer periphery of the protective patch is m, and the dimension of the through hole is d, satisfying: d≤m.

[0011] According to some embodiments of the present invention, there are a plurality of through holes, and the plurality of through holes are arranged at intervals along the circumference of the protection patch.

[0012] According to some embodiments of the utility model, in the thickness direction of the battery top cover, the mounting hole has a first step surface and a second step surface spaced apart from each other, the explosion-proof valve is mounted on the first step surface, and the protective patch is mounted on the second step surface, and in a projection plane perpendicular to the thickness direction of the battery top cover, the projection of the second step surface surrounds the outer peripheral edge of the projection of the first step surface.

[0013] According to some embodiments of the present invention, in the thickness direction of the battery top cover, the distance from the protective patch to the explosion-proof valve is W, which satisfies: 0.2mm≤W≤1mm.

[0014] According to some embodiments of the present invention, the thickness of the protective patch is D, which satisfies: 0.03mm≤D≤0.3mm.

[0015] According to some embodiments of the present invention, the protective patch is an integrally formed plastic part.

[0016] The battery according to the embodiment of the second aspect of the utility model comprises: a battery shell and a battery top cover covering the opening of the battery shell, wherein the battery top cover is provided with the explosion-proof valve structure 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 structure, not only the impact of the electrolyte on the explosion-proof valve can be well reduced, but also the high-temperature and high-pressure gas can be well discharged when thermal runaway occurs in the electrode group.

[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 an exploded view of a battery top cover according to some embodiments of the utility model;

[0021] Figure 2 It is a schematic diagram of a protective patch according to some embodiments of the utility model.

[0022] Figure 3 is a top view of a battery top cover according to some embodiments of the utility model;

[0023] Figure 4 yes Figure 3 Sectional view along line AA;

[0024] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0025] Figure 6 is a cross-sectional view of a partial structure of a battery according to some embodiments of the utility model;

[0026] Figure 7 yes Figure 6 Enlarged view of point C in the middle.

[0027] Reference numerals:

[0028] 10. Battery top cover; 11. Mounting hole; 111. First step surface; 112. Second step surface;

[0029] 20. explosion-proof valve structure; 21. explosion-proof valve; 211. explosion-proof valve body; 212. mounting seat; 22. protective patch; 221. through hole;

[0030] 30. Electrolyte. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Reference below Figure 1-Figure 7 The explosion-proof valve structure 20 according to the embodiment of the present invention is described.

[0035] Reference Figure 1-Figure 7 According to the explosion-proof valve structure 20 of the first embodiment of the utility model, the explosion-proof valve structure 20 is used for the battery top cover 10, and the explosion-proof valve structure 20 is arranged on the battery top cover 10. When the battery has thermal runaway, the high-temperature gas inside the battery can be discharged to the external environment through the explosion-proof valve 21, which can prevent the battery from exploding.

[0036] The battery top cover 10 has a mounting hole 11, and the explosion-proof valve structure 20 includes an explosion-proof valve 21 and a protective patch 22. The explosion-proof valve 21 is installed in the mounting hole 11; the protective patch 22 is installed on the battery top cover 10, and the protective patch 22 is located on the side of the explosion-proof valve 21 facing the electrode group, and the protective patch 22 is separated from the explosion-proof valve 21. The protective patch 22 is arranged on the side of the explosion-proof valve 21 close to the electrode group. When the battery is shaken, the electrolyte 30 will impact the protective patch 22, which can prevent the electrolyte 30 from directly impacting the explosion-proof valve 21, reduce the risk of the explosion-proof valve 21 being cracked due to the direct impact of the electrolyte 30, and increase the service life of the explosion-proof valve 21.

[0037] The protective patch 22 is provided with a through hole 221, and the electrolyte 30 flows between the protective patch 22 and the explosion-proof valve 21 through the through hole 221. For example, in the projection plane perpendicular to the thickness direction of the battery top cover 10, the through hole 221 can be circular, rectangular or other irregular shapes; preferably, the through hole 221 is circular, which can facilitate the processing and manufacturing of the through hole 221 on the one hand, and on the other hand, can ensure the structural strength of the protective patch 22.

[0038] Specifically, when the electrolyte 30 impacts the protective patch 22, the electrolyte 30 can flow between the protective patch 22 and the explosion-proof valve 21 through the through hole 221. The through hole 221 is provided on the protective patch 22. On the one hand, when the protective patch 22 is impacted by the electrolyte 30, there is sufficient buffering effect to prevent the protective patch 22 from being subjected to a large impact and causing the protective patch 22 to fall off; on the other hand, when the battery has thermal runaway, the high-temperature gas inside the battery can be discharged to the explosion-proof valve 21 through the through hole 221, and then discharged to the external environment through the explosion-proof valve 21, which can ensure that the explosion-proof valve 21 can be opened in time; on the other hand, it can ensure that the pressure between the explosion-proof valve 21 and the protective patch 22 is balanced with the pressure inside the pole group, preventing the pressure inside the pole group from being higher than the pressure between the explosion-proof valve 21 and the protective patch 22, causing the protective patch 22 to deform, fall off, and other problems.

[0039] According to the explosion-proof valve structure 20 of the embodiment of the utility model, a protective patch 22 is provided on the side of the explosion-proof valve 21 facing the electrode group. When the battery is shaken, the electrolyte 30 will impact the protective patch 22, which can prevent the electrolyte 30 from directly impacting the explosion-proof valve 21, thereby increasing the service life of the explosion-proof valve 21; a through hole 221 is provided on the protective patch 22, which, on the one hand, can play a buffering role when the electrolyte 30 impacts the protective patch 22, thereby preventing the protective patch 22 from falling off when the protective patch 22 is subjected to a large impact; on the other hand, when the battery has thermal runaway, it can ensure that the explosion-proof valve 21 can be opened in time.

[0040] According to some embodiments of the present invention, referring to Figure 3-Figure 7 The explosion-proof valve 21 includes an explosion-proof valve body 211 and a mounting seat 212. The mounting seat 212 is connected to the outer periphery of the explosion-proof valve body 211. In the thickness direction of the battery top cover 10, the through hole 221 and the mounting seat 212 are arranged opposite to each other. When the electrolyte 30 impacts the protective patch 22, the through hole 221 and the mounting seat 212 are arranged opposite to each other. The electrolyte 30 will impact the mounting seat 212 through the through hole 221, which can prevent the electrolyte 30 from directly impacting the explosion-proof valve body 211 when passing through the through hole 221, so as to protect the explosion-proof valve 21 and further increase the service life of the explosion-proof valve 21.

[0041] According to some embodiments of the present invention, referring to Figure 1-Figure 7In the projection plane perpendicular to the thickness direction of the battery top cover 10 , the projection of the through hole 221 is located outside the projection of the explosion-proof valve body 211 , which can further ensure that the electrolyte 30 will not directly impact the explosion-proof valve body 211 when passing through the through hole 221 .

[0042] According to some embodiments of the present invention, referring to Figure 1-Figure 5 In the projection plane perpendicular to the thickness direction of the battery top cover 10, the straight line passing through the center of any through hole 221 is the first straight line. The protective patch 22 is provided with a plurality of through holes 221, and the straight line passing through the center of any through hole 221 is the first straight line. The first straight line extends from the explosion-proof valve body 211 to the through hole 221. In the first straight line, the dimension from the inner periphery of the mounting seat 212 to the outer periphery of the protective patch 22 is m, and the dimension of the through hole 221 is d, satisfying: d≤m.

[0043] In the first straight line, the size of the through hole 221 is less than or equal to the size from the inner circumference of the mounting seat 212 to the outer circumference of the protective patch 22, that is, in the first straight line, the size of the through hole 221 can be smaller than the size from the inner circumference of the mounting seat 212 to the outer circumference of the protective patch 22, and the size of the through hole 221 can be equal to the size from the inner circumference of the mounting seat 212 to the outer circumference of the protective patch 22, which can prevent the electrolyte 30 from directly impacting the explosion-proof valve body 211 when passing through the through hole 221, and is used to protect the explosion-proof valve 21, which can increase the service life of the explosion-proof valve 21.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 2 There are multiple through holes 221, and the multiple through holes 221 are arranged at intervals along the circumference of the protection patch 22. The multiple through holes 221 can increase the buffering effect when the protection patch 22 is impacted by the electrolyte 30; when the battery thermal runaway occurs, the rate at which the high-temperature gas inside the battery is discharged into the external environment can be increased.

[0045] According to some embodiments of the present invention, referring to Figure 3-Figure 7 In the thickness direction of the battery top cover 10, the mounting hole 11 has a first step surface 111 and a second step surface 112 which are spaced apart from each other, the explosion-proof valve 21 is mounted on the first step surface 111, and the protective patch 22 is mounted on the second step surface 112. In the projection plane perpendicular to the thickness direction of the battery top cover 10, the projection of the second step surface 112 surrounds the outer periphery of the projection of the first step surface 111, that is, the size of the protective patch 22 is larger than that of the explosion-proof valve 21, which can further prevent the electrolyte 30 from directly impacting the explosion-proof valve 21.

[0046] According to some embodiments of the present invention, referring to Figure 1-Figure 5In the thickness direction of the battery top cover 10, the distance from the protective patch 22 to the explosion-proof valve 21 is W, which satisfies: 0.2mm≤W≤1mm. Optionally, the distance from the protective patch 22 to the explosion-proof valve 21 can be: 0.2mm, 0.4mm, 0.5mm, 0.8mm, 1mm, etc. By setting the distance from the protective patch 22 to the explosion-proof valve 21 within this range, the capacity of the electrolyte 30 between the protective patch 22 and the explosion-proof valve 21 can be within a suitable range, which can play a better buffering role for the protective patch 22.

[0047] For example, when the distance from the protective patch 22 to the explosion-proof valve 21 is W < 0.2 mm, the protective patch 22 is too close to the explosion-proof valve 21. When the electrolyte 30 impacts the protective patch 22, the protective patch 22 may be deformed. When deformed, the protective patch 22 may hit the explosion-proof valve 21, causing damage to the explosion-proof valve 21.

[0048] For another example, when the distance from the protective patch 22 to the explosion-proof valve 21 is W>1mm, the capacity of the electrolyte 30 between the protective patch 22 and the explosion-proof valve 21 will be excessive. When the battery shakes, the electrolyte 30 impacts the explosion-proof valve 21 and damages the explosion-proof valve 21.

[0049] According to some embodiments of the present invention, referring to Figure 1-Figure 2 , the thickness of the protective patch 22 is D, which satisfies: 0.03mm≤D≤0.3mm. Optionally, the thickness of the protective patch 22 can be: 0.03mm, 0.04mm, 0.05mm, 0.08mm, 0.11mm, 0.15mm, 0.18mm, 0.3mm, etc. By making the thickness of the protective patch 22 within the above size range, the structural strength of the protective patch 22 can be ensured, so that the protective patch 22 can better block the electrolyte 30 when impacted by the electrolyte 30.

[0050] According to some embodiments of the present invention, referring to Figure 1-Figure 7 The protective patch 22 is an integrally formed plastic part, which can make the processing technology of the protective patch 22 simple and low in cost. For example, the material of the protective patch 22 can include but is not limited to: PC, PET and other plastic materials.

[0051] The battery according to the embodiment of the second aspect of the utility model comprises: a battery shell and a battery top cover 10 covering the opening of the battery shell, and the battery top cover 10 is provided with the explosion-proof valve structure 20 according to the embodiment of the first aspect of the utility model.

[0052] According to the battery of the embodiment of the utility model, by providing the explosion-proof valve structure 20, not only the impact of the electrolyte 30 on the explosion-proof valve 21 can be reduced, but also the high-temperature and high-pressure gas can be discharged better when thermal runaway occurs in the electrode group.

[0053] 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.

[0054] 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 structure, used for a battery top cover, characterized in that: The battery top cover has a mounting hole, and the explosion-proof valve structure includes: An explosion-proof valve, the explosion-proof valve being installed in the installation hole; A protective patch is installed on the battery top cover, the protective patch is located on the side of the explosion-proof valve facing the pole group and is separated from the explosion-proof valve, and the protective patch is provided with a through hole allowing the electrolyte to pass through.

2. The explosion-proof valve structure according to claim 1, characterized in that: The explosion-proof valve comprises an explosion-proof valve body and a mounting seat connected to the outer periphery of the explosion-proof valve body. In the thickness direction of the battery top cover, the through hole and the mounting seat are arranged opposite to each other.

3. The explosion-proof valve structure according to claim 2, characterized in that: In a projection plane perpendicular to the thickness direction of the battery top cover, the projection of the through hole is located outside the projection of the explosion-proof valve body.

4. The explosion-proof valve structure according to claim 2, characterized in that: In the projection plane perpendicular to the thickness direction of the battery top cover, a straight line passing through the center of any through hole is a first straight line, and the first straight line extends from the explosion-proof valve body to the through hole. In the first straight line, the dimension from the inner periphery of the mounting seat to the outer periphery of the protective patch is m, and the dimension of the through hole is d, satisfying: d≤m.

5. The explosion-proof valve structure according to claim 2, characterized in that: There are a plurality of through holes, and the plurality of through holes are arranged at intervals along the circumference of the protection patch.

6. The explosion-proof valve structure according to claim 1, characterized in that: In the thickness direction of the battery top cover, the mounting hole has a first step surface and a second step surface spaced apart from each other, the explosion-proof valve is mounted on the first step surface, and the protective patch is mounted on the second step surface. In a projection plane perpendicular to the thickness direction of the battery top cover, the projection of the second step surface surrounds the outer peripheral edge of the projection of the first step surface.

7. The explosion-proof valve structure according to claim 1, characterized in that: In the thickness direction of the battery top cover, the distance from the protective patch to the explosion-proof valve is W, which satisfies: 0.2mm≤W≤1mm.

8. The explosion-proof valve structure according to claim 1, characterized in that: The thickness of the protective patch is D, which satisfies: 0.03mm≤D≤0.3mm.

9. The explosion-proof valve structure according to claim 1, characterized in that: The protective patch is an integrally formed plastic part.

10. A battery, characterized in that: include: A battery shell and a battery top cover arranged on the opening of the battery shell, wherein the battery top cover is provided with an explosion-proof valve structure according to any one of claims 1-9.

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