Explosion-proof valve and battery

Abstract

The utility model relates to the technical battery manufacturing field, in particular to an explosion-proof valve and a battery. The explosion-proof valve in the battery includes an explosion-proof sheet and a reinforcement structure, the battery shell is provided with an explosion-proof hole along the length direction, the explosion-proof sheet is fixed in the explosion-proof hole, the reinforcement structure is fixed on the battery shell around the explosion-proof hole, and the reinforcement structure is configured to improve the structural strength of the explosion-proof hole on the battery shell, so that on the basis of realizing the explosion-proof treatment of the battery shell, by fixing the reinforcement structure on the battery shell around the explosion-proof hole, the structural strength of the explosion-proof hole on the battery shell can be improved, when the battery shell is deformed by force, the reinforcement structure can prevent the explosion-proof hole in the middle area of ​​the battery shell along the length direction from deforming with the deformation of the battery shell, and then prevent the explosion-proof sheet in the explosion-proof hole from deforming with the deformation of the explosion-proof hole, thereby improving the protection of the explosion-proof sheet and achieving a good explosion-proof effect.

Description

Technical Field

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

[0002] With the booming development of the battery industry and the increasing demand of people, batteries are gradually developing towards large size, large capacity and high energy density. While improving the size, capacity and energy density of batteries, we should also pay attention to the safety performance of batteries. As the last line of defense to ensure battery safety, the explosion-proof valve deserves more attention.

[0003] In the prior art, taking the blade battery as an example, the explosion-proof valve is usually set at one end of the blade battery along the length direction. However, due to the long length of the blade battery, if the blade battery fails, the internal gas of the blade battery cannot be quickly discharged along the explosion-proof valve when the explosion-proof valve is set at one end of the blade battery along the length direction, which affects the opening sensitivity and exhaust effect of the explosion-proof valve when the battery fails. In order to solve the above problems, the explosion-proof valve is set in the middle area of ​​the blade battery along the length direction, but due to the thin thickness of the battery shell, the battery shell is easily deformed by force, which causes the explosion-proof valve set in the middle area of ​​the battery shell to rupture and damage, resulting in unnecessary waste.

[0004] Therefore, it is urgent to invent explosion-proof valve and battery to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an explosion-proof valve and a battery, so as to achieve stable fixation of the explosion-proof valve in the middle area of ​​a battery housing, with high structural strength and good explosion-proof effect.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Explosion-proof valve, including:

[0008] An explosion-proof sheet, wherein the battery housing is provided with an explosion-proof hole along the length direction, and the explosion-proof sheet is fixed in the explosion-proof hole; and

[0009] A reinforcing structure is fixed on the battery housing at the periphery of the explosion-proof hole, and the reinforcing structure is configured to improve the structural strength of the explosion-proof hole on the battery housing.

[0010] As an optional solution, a rupture groove is provided on the explosion-proof plate, and the rupture pressure threshold at the rupture groove is smaller than the rupture pressure threshold at other positions of the explosion-proof plate.

[0011] As an optional solution, the rupture groove is arranged at the center of the explosion-proof plate, and the rupture groove is at least one of an "I" shape, a "X" shape, an "H" shape, an "N" shape, a "T" shape and an "O" shape.

[0012] As an optional solution, a vertical height difference H between an outer end surface of the reinforcement structure and an outer end surface of the battery housing is 0.5 mm to 1 mm.

[0013] As an optional solution, an avoidance hole is provided in the reinforcement structure, and the hole wall of the avoidance hole is flush with the hole wall of the explosion-proof hole.

[0014] As an optional solution, the wall thickness L of the reinforcement structure is 1 mm to 2 mm.

[0015] As an optional solution, the explosion-proof valve further includes a protection sheet, which is fixed on the outer end surface of the reinforcement structure, and the protection sheet is configured to protect the explosion-proof sheet.

[0016] As an optional solution, the material of the protection sheet is PET, PP, PE or PI.

[0017] As an optional solution, the explosion-proof sheet and the explosion-proof hole are fixed by welding, and the reinforcement structure and the battery casing around the explosion-proof hole are fixed by welding.

[0018] A battery comprises a battery cell, an electrolyte, a battery shell and the explosion-proof valve as described above, wherein the battery cell and the electrolyte are both accommodated in the battery shell, and two poles on the battery cell are respectively penetrated and fixed on the battery shell and extend out of the battery shell, and the poles are configured to dock with electrical equipment.

[0019] Beneficial effects of the utility model:

[0020] The explosion-proof valve provided by the utility model realizes explosion-proof treatment of the battery shell by fixing the explosion-proof sheet in the explosion-proof hole of the battery shell; by arranging the explosion-proof hole in the length direction of the battery shell, the explosion-proof sensitivity of the battery shell and the sufficiency of gas discharge along the explosion-proof sheet can be guaranteed; by fixing a reinforcing structure on the battery shell at the periphery of the explosion-proof hole, the structural strength of the explosion-proof hole on the battery shell can be improved; when the battery shell is deformed by force, the reinforcing structure can prevent the explosion-proof hole from deforming along with the deformation of the battery shell, and further prevent the explosion-proof sheet in the explosion-proof hole from deforming along with the deformation of the explosion-proof hole, thereby preventing the explosion-proof sheet from being deformed and tearing, thereby improving the protection of the explosion-proof sheet and achieving good explosion-proof effect.

[0021] The present embodiment also provides a battery, which realizes explosion-proof treatment of the battery shell by applying the above-mentioned explosion-proof valve, ensures the explosion-proof sensitivity of the battery shell and the sufficiency of gas discharge along the explosion-proof plate, and can improve the structural strength of the explosion-proof hole on the battery shell. When the battery shell is deformed under force, the reinforced structure can prevent the explosion-proof hole from deforming along with the deformation of the battery shell, and further prevent the explosion-proof plate in the explosion-proof hole from deforming along with the deformation of the explosion-proof hole, prevent the explosion-proof plate from deforming and tearing, improve the protection of the explosion-proof plate, and have a good explosion-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the explosion-proof valve and the battery housing provided by the embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of an explosion of an explosion-proof valve provided in an embodiment of the utility model;

[0024] Figure 3 It is a cross-sectional schematic diagram of an explosion-proof valve provided by an embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the reinforcement structure and the protection sheet provided in the embodiment of the utility model.

[0026] In the figure:

[0027] 100. Explosion-proof valve;

[0028] 110. explosion-proof plate; 111. rupture groove; 120. reinforcement structure; 121. avoidance hole; 130. protection plate; 200. battery housing; 210. explosion-proof hole. DETAILED DESCRIPTION

[0029] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, 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 of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] In the prior art, taking the blade battery as an example, the explosion-proof valve is usually set at one end of the blade battery along the length direction. However, due to the long length of the blade battery, if the blade battery fails, the internal gas of the blade battery cannot be quickly discharged along the explosion-proof valve when the explosion-proof valve is set at one end of the blade battery along the length direction, which affects the opening sensitivity and exhaust effect of the explosion-proof valve when the battery fails. In order to solve the above problems, the explosion-proof valve is set in the middle area of ​​the blade battery along the length direction, but due to the thin thickness of the battery shell, the battery shell is easily deformed by force, which causes the explosion-proof valve set in the middle area of ​​the battery shell to rupture and damage, resulting in unnecessary waste.

[0034] In order to solve the above problems, Figure 1 to Figure 4 As shown, this embodiment provides an explosion-proof valve 100. The explosion-proof valve 100 includes an explosion-proof disc 110 and a reinforcement structure 120, wherein an explosion-proof hole 210 is provided in the length direction of the battery housing 200, the explosion-proof disc 110 is fixed in the explosion-proof hole 210, and the reinforcement structure 120 is fixed on the battery housing 200 at the periphery of the explosion-proof hole 210, and the reinforcement structure 120 is configured to improve the structural strength of the explosion-proof hole 210 on the battery housing 200.

[0035] It should be noted that the explosion-proof valve 100 in this embodiment is not suitable for traditional square batteries, but is only suitable for horizontally arranged batteries (such as blade batteries); the battery shell of this type of battery is arranged horizontally, and cover plates are respectively arranged at the left and right ends of the battery shell.

[0036] The explosion-proof valve 100 achieves explosion-proof treatment of the battery shell 200 by fixing the explosion-proof plate 110 in the explosion-proof hole 210 of the battery shell 200. By arranging the explosion-proof hole 210 in the length direction of the battery shell 200, the explosion-proof sensitivity of the battery shell 200 and the sufficiency of gas discharge along the explosion-proof plate 110 can be guaranteed. By fixing the reinforcing structure 120 on the battery shell 200 at the periphery of the explosion-proof hole 210, the structural strength of the explosion-proof hole 210 on the battery shell 200 can be improved. When the battery shell 200 is deformed by force, the reinforcing structure 120 can prevent the explosion-proof hole 210 from deforming along with the deformation of the battery shell 200, thereby preventing the explosion-proof plate 110 in the explosion-proof hole 210 from deforming along with the deformation of the explosion-proof hole 210, preventing the deformation and tearing of the explosion-proof plate 110, improving the protection of the explosion-proof plate 110, and achieving good explosion-proof effect.

[0037] As an optional solution, a rupture groove 111 is provided on the explosion-proof piece 110, and the rupture pressure threshold at the rupture groove 111 is less than the rupture pressure threshold at other positions of the explosion-proof piece 110. By providing the rupture groove 111 on the explosion-proof piece 110, it is ensured that the rupture pressure threshold of the rupture groove 111 is less than the rupture pressure threshold at other positions of the explosion-proof piece 110. When the gas pressure in the battery housing 200 gradually increases, the gas pressure in the battery housing 200 first reaches the rupture pressure threshold of the rupture groove 111, and then the rupture groove 111 ruptures, so that the gas in the battery housing 200 is discharged along the rupture opening of the rupture groove 111, thereby realizing explosion protection of the battery housing 200.

[0038] Specifically, the rupture groove 111 is arranged at the center of the explosion-proof plate 110, and the rupture groove 111 is at least one of a "one" shape, a "cross" shape, an "H" shape, an "N" shape, a "T" shape, and an "O" shape. By arranging the rupture groove 111 at the center of the explosion-proof plate 110, the rupture groove 111 can be evenly stressed, and the rupture effect is good when rupture occurs. It should be noted that in the present embodiment, the rupture groove 111 is in a "cross" shape. When the gas in the battery housing 200 pushes open the rupture groove 111, the "cross" shaped rupture groove 111 ruptures, so that the explosion-proof plate 110 near the rupture groove 111 ruptures into four petals. It can be understood that the shapes of the rupture grooves 111 listed above are only for illustration. In other embodiments, the specific shape of the rupture groove 111 can be arbitrarily adjusted according to actual needs, and this embodiment does not make specific limitations.

[0039] As an optional solution, a avoidance hole 121 is provided in the reinforcement structure 120, and the hole wall of the avoidance hole 121 is flush with the hole wall of the explosion-proof hole 210. By providing the avoidance hole 121 in the reinforcement structure 120 and ensuring that the hole wall of the avoidance hole 121 is flush with the hole wall of the explosion-proof hole 210, the reinforcing effect of the reinforcement structure 120 on the structural strength of the explosion-proof hole 210 can be further ensured, and the protection of the explosion-proof disk 110 in the explosion-proof hole 210 can be improved.

[0040] In an optional embodiment, the vertical height difference H between the outer end face of the reinforcing structure 120 and the outer end face of the battery housing 200 is 0.5mm to 1mm. By limiting the vertical height difference H between the outer end face of the reinforcing structure 120 and the outer end face of the battery housing 200 to within the range of 0.5mm to 1mm, it can be ensured that the reinforcing structure 120 will not affect the subsequent assembly of the battery housing 200, and ensure that the battery housing 200 can be assembled and fixed normally. It should be noted that in this embodiment, the vertical height difference H between the outer end face of the reinforcing structure 120 and the outer end face of the battery housing 200 is 0.8mm. In other embodiments, the vertical height difference H between the outer end face of the reinforcing structure 120 and the outer end face of the battery housing 200 can also be arbitrarily adjusted within the range of 0.5mm to 1mm according to actual needs, and this embodiment is not specifically limited.

[0041] In addition, the wall thickness L of the reinforcing structure 120 is 1 mm to 2 mm. By limiting the wall thickness L of the reinforcing structure 120 to between 1 mm and 2 mm, the effective fixation of the reinforcing structure 120 and the battery housing 200 can be ensured, so that the reinforcing structure 120 can fully improve the structural strength at the explosion-proof hole 210. It should be noted that in this embodiment, the wall thickness L of the reinforcing structure 120 is 1.5 mm. In other embodiments, the wall thickness L of the reinforcing structure 120 can also be arbitrarily adjusted within the range of 1 mm to 2 mm according to actual needs, and this embodiment does not make specific limitations.

[0042] In an optional embodiment, the explosion-proof disc 110 and the explosion-proof hole 210 are fixed by welding, and the reinforcing structure 120 and the battery shell 200 around the explosion-proof hole 210 are fixed by welding. The welding fixation method has a good fixing effect and stable fixation. It should be noted that in this embodiment, the explosion-proof disc 110 and the explosion-proof hole 210 are welded and fixed by laser welding, and the reinforcing structure 120 and the battery shell 200 around the explosion-proof hole 210 are welded and fixed by laser welding. Laser welding has a fast welding speed, high welding accuracy, and small deformation after welding. In other embodiments, the explosion-proof disc 110 and the explosion-proof hole 210 and the reinforcing structure 120 and the battery shell 200 around the explosion-proof hole 210 can also be welded by other welding methods, which are not specifically limited in this embodiment.

[0043] In this embodiment, the reinforcing structure 120, the explosion-proof disk 110 and the battery housing 200 are all made of metal aluminum material, so as to facilitate welding and fixing between the reinforcing structure 120, the explosion-proof disk 110 and the battery housing 200. In other embodiments, the reinforcing structure 120, the explosion-proof disk 110 and the battery housing 200 may also be made of copper material or other metal materials with certain rigidity and conductivity, which is not specifically limited in this embodiment.

[0044] As an optional solution, the explosion-proof valve 100 further includes a protective sheet 130, which is fixed on the outer end surface of the reinforcement structure 120, and is configured to protect the explosion-proof sheet 110. By arranging the protective sheet 130 on the outer end surface of the reinforcement structure 120, it is not only possible to prevent external objects from scratching the explosion-proof sheet 110 from the outer end surface of the explosion-proof sheet 110, but also to collect the fragments splashed by the explosion-proof sheet 110 when the explosion-proof sheet 110 ruptures, so as to facilitate the sorting of the explosion-proof sheet 110 after the explosion.

[0045] Furthermore, the material of the protective sheet 130 is PET (polyethyleneterephthalate), PP (Polypropylene), PE (polyethylene) or PI (Polyimide), so that the protective sheet 130 not only has high tensile strength and strong flexibility, but also meets the requirements of high temperature resistance and corrosion resistance. It should be noted that in this embodiment, the material of the protective sheet 130 is PET. In other embodiments, the material of the protective sheet 130 includes but is not limited to the materials mentioned above, and it only needs to ensure that it has good tensile strength, flexibility, high temperature resistance and corrosion resistance, which is not specifically limited in this embodiment.

[0046] This embodiment also provides a battery. The battery includes a battery cell, an electrolyte, a battery shell 200 and the above-mentioned explosion-proof valve 100. The battery cell and the electrolyte are both contained in the battery shell 200. The two poles on the battery cell are respectively fixed on the battery shell 200 and extend out of the battery shell 200. The poles are configured to dock with electrical equipment. The battery realizes explosion-proof treatment of the battery by applying the above-mentioned explosion-proof valve 100, ensures the explosion-proof sensitivity of the battery and the sufficiency of gas discharge along the explosion-proof plate 110, and can improve the structural strength of the explosion-proof hole 210 on the battery shell 200. When the battery shell 200 is deformed by force, the reinforcement structure 120 can prevent the explosion-proof hole 210 from deforming with the deformation of the battery shell 200, and then prevent the explosion-proof plate 110 in the explosion-proof hole 210 from deforming with the deformation of the explosion-proof hole 210, prevent the deformation and tearing of the explosion-proof plate 110, improve the protection of the explosion-proof plate 110, and have a good explosion-proof effect.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Explosion-proof valve, characterized in that: The explosion-proof valve is only applicable to a battery arranged horizontally, the battery housing (200) of the battery is arranged horizontally, and the left and right ends of the battery housing (200) are respectively provided with cover plates, and the explosion-proof valve comprises: An explosion-proof sheet (110), wherein the battery housing (200) is provided with an explosion-proof hole (210) along the length direction, and the explosion-proof sheet (110) is fixed in the explosion-proof hole (210); and A reinforcing structure (120), the reinforcing structure (120) being fixed on the battery housing (200) at the periphery of the explosion-proof hole (210), the reinforcing structure (120) being configured to improve the structural strength of the explosion-proof hole (210) on the battery housing (200); An avoidance hole (121) is provided in the reinforcement structure (120), and a hole wall of the avoidance hole (121) is flush with a hole wall of the explosion-proof hole (210).

2. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof disc (110) is provided with a rupture groove (111), and the rupture pressure threshold at the rupture groove (111) is lower than the rupture pressure thresholds at other positions of the explosion-proof disc (110).

3. The explosion-proof valve according to claim 2, characterized in that: The rupture groove (111) is arranged at the center of the explosion-proof plate (110), and the rupture groove (111) is at least one of an "I" shape, a "X" shape, an "H" shape, an "N" shape, a "T" shape, and an "O" shape.

4. The explosion-proof valve according to claim 1, characterized in that: A vertical height difference H between an outer end surface of the reinforcement structure (120) and an outer end surface of the battery housing (200) is 0.5 mm to 1 mm.

5. The explosion-proof valve according to claim 1, characterized in that: The wall thickness L of the reinforcement structure (120) is 1 mm to 2 mm.

6. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof valve further comprises a protection sheet (130), wherein the protection sheet (130) is fixed on the outer end surface of the reinforcement structure (120), and the protection sheet (130) is configured to protect the explosion-proof sheet (110).

7. The explosion-proof valve according to claim 6, characterized in that: The material of the protection sheet (130) is PET, PP, PE or PI.

8. The explosion-proof valve according to claim 1, characterized in that: The explosion-proof sheet (110) and the explosion-proof hole (210) are fixed by welding, and the reinforcement structure (120) and the battery housing (200) at the periphery of the explosion-proof hole (210) are fixed by welding.

9. A battery, characterized in that The invention comprises a battery cell, an electrolyte, a battery casing (200), and an explosion-proof valve according to any one of claims 1 to 8, wherein the battery cell and the electrolyte are both contained in the battery casing (200), two poles on the battery cell are respectively fixed on the battery casing (200) and extend out of the battery casing (200), and the poles are configured to be connected to an electrical device.

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