Explosion-proof valve and battery

Abstract

An anti-explosion valve comprises an arc-shaped protection wall, a welding flange connected to the outer edge of the lower end of the arc-shaped protection wall and a valve plate connected to the inner edge of the upper end of the arc-shaped protection wall. The arc-shaped protection wall extends upwards from the welding flange and is gradually retracted into the valve plate; the wall thickness of the arc-shaped protection wall is 1-2.5 times of the thickness T of the valve plate; an anti-explosion nick is arranged on one surface, facing the battery cell, of the valve plate; and a circular sunken part which is sunken towards the interior of the battery is arranged on the valve plate. The arc-shaped protection wall is adopted for transition, so that stress changes are uniform, and the risk of nick fracture caused by stress concentration is avoided; and meanwhile, the arc-shaped protection wall can better resist deformation caused by external force. The anti-explosion valve plate is higher than the welding flange and is in an upward protruding state, the effect of preventing electrolyte from being accumulated can be achieved, meanwhile, the anti-explosion line is arranged on the inner side, and the situation that the nick is corroded by acidic materials generated by the reaction of the electrolyte and air is avoided. The overall structural strength of the anti-explosion valve is far higher than that of an existing anti-explosion valve, and the problem of liquid leakage caused by the fact that the anti-explosion valve is affected by external force in the transportation and using process can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to an explosion-proof valve. Background Art

[0002] As a passive safety measure to relieve the thermal runaway of the battery system, the explosion-proof valve plays a very important role in the design of the battery cell. The current explosion-proof valve sheet includes a welding part, a blasting part, and a strengthening part, and strengthening rib notches are provided in the strengthening part. The strengthening rib notches are communicated with the blasting notches of the blasting part. When the blasting pressure is reached, the valve sheet will tear and break along the blasting notches. However, due to the presence of blasting notches and strengthening rib notches on the valve sheet, the valve sheet is prone to deformation during transportation and use. After the valve sheet is deformed, the stability of the valve sheet will be reduced, and even cracks in the valve sheet and liquid leakage of the battery cell may occur. Summary of the Invention

[0003] The purpose of the utility model is to provide an explosion-proof valve to solve the problems that the existing explosion-proof valve has a fragile structure, the valve sheet is prone to deformation during transportation and use, resulting in cracks and battery liquid leakage.

[0004] The technical solution of the utility model lies in: an explosion-proof valve, including an arc-shaped protective wall, a welding flange connected to the outer edge of the lower end of the arc-shaped protective wall, and a valve sheet connected to the inner edge of the upper end of the arc-shaped protective wall;

[0005] The arc-shaped protective wall extends upward from the welding flange and gradually converges inward to the valve sheet;

[0006] The wall thickness of the arc-shaped protective wall is 1 - 2.5 times the thickness T of the valve sheet;

[0007] An explosion-proof notch is provided on the surface of the valve sheet facing the battery cell;

[0008] A circular recessed part recessed towards the inside of the battery is provided on the valve sheet.

[0009] The depth Dg of the explosion-proof notch is 50% - 80% of the thickness T of the valve sheet.

[0010] The depth Dc of the circular recessed part is 1.5 - 1.7 times the thickness T of the valve sheet.

[0011] The outer edge of the valve sheet is circular or a continuous closed figure composed of more than one arc and a straight line.

[0012] The valve sheet includes two semi-circular parts that are directly or indirectly connected; the distance between the explosion-proof notch and the edge of the valve sheet is 8% - 10% of the radius of the semi-circular part of the valve sheet;

[0013] The width of the explosion-proof notch is 3% - 4% of the radius of the semi-circular part of the valve sheet.

[0014] The circular recess is concentric with the circle where the semi-circular part of the valve plate is located.

[0015] The valve plate is in a runway shape and includes two semi-circular parts connected by a rectangular part; the explosion-proof notch is in a semi-closed runway shape adapted to the valve plate; the arc parts at both ends of the explosion-proof notch are concentric with the two semi-circular parts of the valve plate respectively.

[0016] There are two circular recesses on the valve plate; the two circular recesses are concentric with the two semi-circular parts of the valve plate respectively; the radius of the outer edge of the circular recess is smaller than the radius of the inner edge of the arc part of the explosion-proof notch.

[0017] The valve plate is circular and includes two directly connected semi-circular parts; the explosion-proof notch is in an unclosed circular shape; the explosion-proof notch is concentric with the valve plate.

[0018] The circular recess is concentric with the valve plate; the radius of the outer edge of the circular recess is smaller than the radius of the inner edge of the arc part of the explosion-proof notch.

[0019] The present utility model also provides a battery, which is installed with the above explosion-proof valve.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: The overall valve plate is higher than the welding flange. Due to its arc-shaped protective wall, the overall structural strength is much greater than that of the explosion-proof valve provided by the prior art, and it can prevent the liquid leakage problem of the explosion-proof valve caused by external forces during transportation and use. Especially for the battery core with a relatively thin thickness (thickness ≤ 25 mm), this design can protect the valve plate and prevent problems from occurring.

[0021] The explosion-proof valve provided by the present utility model includes a welding flange, an arc-shaped protective wall, a valve plate. The valve plate is provided with a notch and a circular recess. The arc-shaped protective wall extends upward from the welding flange and gradually converges inward to the valve plate, with an arc transition, and the stress change is uniform, without the risk of the notch cracking caused by stress concentration; at the same time, the arc-shaped protective wall can better resist the deformation caused by external forces. The valve plate of the explosion-proof valve is higher than the welding flange and protrudes upward, which can prevent the accumulation of electrolyte. At the same time, the explosion-proof line is on the inner side, avoiding the corrosion of the notch caused by the acidic substances generated by the reaction of the electrolyte with the air. The thickness of the protective wall is greater than that of the valve plate, and due to its arc-shaped shape, it can withstand greater torsional deformation and prevent the valve plate from being damaged. The valve plate has a circular recess concentric with the arc edge, which can strengthen the strength of the valve plate and prevent the valve plate from deforming. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic structural diagram of the present invention.

[0024] Figure 2 is the front view of the present invention.

[0025] Figure 3 is Figure 2 the bottom view of

[0026] Figure 4 is Figure 2 the top view of

[0027] Figure 5 is Figure 2 the left view of

[0028] Figure 6 is Figure 4 the A-A sectional view of

[0029] Figure 7 is Figure 6 the enlarged view of part I of

[0030] Figure 8 is Figure 6 the enlarged view of part II of Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0032] For technologies, methods, and devices known to those of ordinary skill in the relevant fields, detailed discussions may not be made, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification.

[0033] Such as Figure 1 , Figure 2As shown in the figure, the first aspect of the present utility model provides an explosion-proof valve, which includes a welding flange 1, an arc-shaped protective wall 2, and a valve sheet 3. The arc-shaped protective wall 2 extends upward from the welding flange 1 and gradually converges inward to the valve sheet 3.

[0034] Figure 3 , Figure 4 , Figure 5 In [relevant figures], the circular recess 5 on the valve sheet 3 is recessed toward the inside of the battery. An explosion-proof notch 4 is provided on the side of the valve sheet 3 facing the battery cell. The distance between the explosion-proof notch 4 and the edge of the valve sheet 3 is 8%-10% of the radius of the semi-circular part of the valve sheet 3; the width of the explosion-proof notch 4 is 3%-4% of the radius of the semi-circular part of the valve sheet 3.

[0035] The valve sheet 3 is in a racetrack shape, including two semi-circular parts connected by a rectangular part; the explosion-proof notch 4 is in a semi-closed racetrack shape adapted to the valve sheet 3; the arc parts at both ends of the explosion-proof notch 4 are concentric with the two semi-circular parts of the valve sheet 3 respectively.

[0036] There are two circular recesses 5 on the valve sheet 3; the two circular recesses 5 are concentric with the two semi-circular parts of the valve sheet 3 respectively. The outer radius of the circular recess 5 is smaller than the inner radius of the arc part of the explosion-proof notch 4.

[0037] As shown in Figure 6 , Figure 7 , Figure 8 , the wall thickness of the arc-shaped protective wall 2 is 1-2.5 times the thickness T of the valve sheet 3; the depth Dc of the circular recess 5 is 1.5-1.7 times the thickness T of the valve sheet 3.

[0038] The notch depth of the valve sheet is controlled according to different bursting pressures, and its remaining thickness is controlled within 20%-50% of the valve sheet thickness; that is, the depth Dg of the explosion-proof notch is 50%-80% of the thickness T of the valve sheet 3.

[0039] An embodiment of the present utility model also provides a battery equipped with the explosion-proof valve described in the first aspect. The aforementioned explosion-proof valve is welded on the battery top cover, and there is a receiving groove for accommodating the explosion-proof valve on the battery top cover. The battery provided by the present utility model uses this battery top cover.

[0040] The above are only exemplary embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An explosion-proof valve, characterized in that: It includes an arc-shaped protective wall (2), a welding flange (1) connected to the outer edge of the lower end of the arc-shaped protective wall (2), and a valve piece (3) connected to the inner edge of the upper end of the arc-shaped protective wall (2); The arc-shaped protective wall (2) extends upward from the welding flange (1) and gradually converges inward to the valve piece (3); The wall thickness of the arc-shaped protective wall (2) is 1 to 2.5 times the thickness T of the valve piece (3); An explosion-proof notch (4) is provided on the surface of the valve piece (3) facing the battery cell; A circular recessed portion (5) recessed toward the interior of the battery is provided on the valve piece (3).

2. The explosion-proof valve according to claim 1, wherein: The depth Dg of the explosion-proof notch is 50% - 80% of the thickness T of the valve piece (3).

3. The explosion-proof valve according to claim 1, wherein: The depth Dc of the circular recessed portion (5) is 1.5 to 1.7 times the thickness T of the valve piece (3).

4. The explosion-proof valve according to claim 1, wherein: The outer edge of the valve piece (3) is circular or a continuous closed figure composed of more than one arc and a straight line; 5. The explosion-proof valve according to claim 1, wherein: The valve piece (3) includes two semi-circular parts that are directly or indirectly connected; the distance between the explosion-proof notch (4) and the edge of the valve piece (3) is 8% - 10% of the radius of the semi-circular part of the valve piece (3); The width of the explosion-proof notch (4) is 3% - 4% of the radius of the semi-circular part of the valve piece (3).

6. The explosion-proof valve according to claim 5, wherein: The circular recessed portion (5) is concentric with the circle where the semi-circular part of the valve piece (3) is located.

7. The explosion-proof valve according to claim 5, characterized in that: The valve piece (3) is in a racetrack shape and includes two semi-circular parts connected by a rectangular part; the explosion-proof notch (4) is in a semi-closed racetrack shape adapted to the valve piece (3); the arc parts at both ends of the explosion-proof notch (4) are concentric with the two semi-circular parts of the valve piece (3) respectively.

8. The explosion-proof valve according to claim 7, wherein: Two circular recessed portions (5) are provided on the valve piece (3); the two circular recessed portions (5) are respectively concentric with the two semi-circular parts of the valve piece (3); the outer edge radius of the circular recessed portion (5) is smaller than the inner edge radius of the arc part of the explosion-proof notch (4).

9. The explosion-proof valve according to claim 5, wherein: The valve piece (3) is circular and includes two semi-circular parts that are directly connected; the explosion-proof notch (4) is in an unclosed circular shape; the explosion-proof notch (4) is concentric with the valve piece (3).

10. A battery, characterized in that: An explosion-proof valve according to any one of claims 1 to 9 is installed.

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