Explosion-proof valve, battery, battery pack and electric device

Abstract

The utility model discloses an explosion-proof valve, a battery, a battery pack and a power utilization device, the explosion-proof valve comprises a body, a valve core, a valve core, a valve core and a valve core, the body is provided with a vent hole; the blasting part is connected with the body through a first bending part and seals the vent hole, and thinning nicks are formed in the outer circumferential face, away from the vent hole, of the first bending part and / or the inner circumferential face, facing the vent hole, of the first bending part. According to the technical scheme, the pressure needed for valve opening can be reduced, quick valve opening is achieved, and the electricity utilization safety is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to an explosion-proof valve, a battery, a battery pack and an electrical device. Background Art

[0002] During the use of the battery, it is inevitable that various reasons will cause the internal thermometer pressure of the battery to rise. If the heat and gas cannot be discharged, it will cause electrical safety problems.

[0003] As a key functional part of the battery, the explosion-proof valve can discharge the heat and gas inside the battery. However, as the capacity of the battery cell increases, in order to further ensure the safety of the battery, it is necessary to open the explosion-proof valve with a smaller pressure. In the prior art, the notch depth is usually increased to reduce the valve opening pressure. If the notch depth is increased, higher manufacturing precision is required, which is not conducive to processing. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide an explosion-proof valve, a battery, a battery pack and an electrical device.

[0005] According to a first aspect of an embodiment of the present application, there is provided an explosion-proof valve, comprising:

[0006] A main body, wherein the main body is provided with a vent hole;

[0007] The bursting part is connected to the main body through a first bending part and closes the vent hole. The first bending part is provided with a thinning notch away from the outer peripheral surface of the vent hole and / or toward the inner peripheral surface of the vent hole.

[0008] Optionally, the main body is a mounting portion, and the mounting portion is connected to the blasting portion via the first bending portion.

[0009] Optionally, the main body includes a mounting portion and a supporting portion, the supporting portion protrudes toward a side away from the mounting portion, and the mounting portion extends along the outer circumference of the supporting portion in a direction away from the supporting portion; the vent hole extends from the bottom end of the supporting portion to the top end of the supporting portion.

[0010] Optionally, one end of the supporting portion is connected to the bursting portion through the first bending portion.

[0011] Optionally, the main body further includes a second bending portion, and the other end of the supporting portion is connected to the mounting portion via the second bending portion.

[0012] Optionally, the thickness of the mounting portion is greater than the thickness of the supporting portion.

[0013] Optionally, a plane extending from the mounting portion to the second bending portion forms a first angle with a plane extending from the supporting portion to the second bending portion, and a plane extending from the bursting portion to the first bending portion forms a second angle with a plane extending from the supporting portion to the first bending portion; the first angle is an obtuse angle, and the second angle is an acute angle.

[0014] Optionally, the second angle ranges from 60° to 90°.

[0015] Optionally, the first angle is complementary to the second angle.

[0016] Optionally, a partial area of ​​the first bending portion is provided with the thinning notch.

[0017] Optionally, the thickness of the first bending portion is 0.2 mm-1 mm, and / or the depth of the thinning notch is 0.1 mm-0.15 mm.

[0018] Optionally, the bottom width of the cross section of the thinned notch is smaller than the top width.

[0019] Optionally, the cross-sectional shape of the thinning notch is trapezoidal or semicircular.

[0020] According to a second aspect of an embodiment of the present application, a battery is provided, comprising the above-mentioned explosion-proof valve.

[0021] According to a third aspect of an embodiment of the present application, there is provided a battery pack, comprising the explosion-proof valve described above; or comprising the battery described above.

[0022] According to a fourth aspect of the embodiments of the present application, there is provided an electrical device comprising the above-mentioned battery or the above-mentioned battery pack.

[0023] A technical effect of an embodiment of the present application is that the bursting part is connected to the main body via a first bending part, a thinning notch is provided on the first bending part, the first bending part is in a bending shape, and the structural strength of the bending structure is weaker than that of the planar structure. Providing a thinning notch on the first bending part can reduce the pressure required to open the valve.

[0024] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0026] Figure 1 This is a schematic diagram of the structure of the explosion-proof valve in the embodiment of the present application;

[0027] Figure 2 It is a front view of the explosion-proof valve in the embodiment of the present application;

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0029] Figure 4 A top view of the explosion-proof valve in an embodiment of the present application;

[0030] Figure 5 for Figure 4 The cross-sectional view at BB in FIG.

[0031] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0032] Figure 7 for Figure 5 A partial enlarged view of point D in the middle.

[0033] Explanation of reference numerals: explosion-proof valve 100; body 1; support portion 11; mounting portion 12; vent hole 13; second bending portion 14; first bending portion 2; thinning notch 21; bursting portion 3; first angle a; second angle b. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] like Figure 1-Figure 7As shown, according to the first aspect of an embodiment of the present application, there is provided an explosion-proof valve 100, comprising a main body 1, a bursting part 3 and a first bent portion 2, wherein the main body 1 is provided with a vent hole 13; the bursting part 3 is connected to the main body 1 through the first bent portion 2 and closes the vent hole 13, and the first bent portion 2 is provided with a thinning notch 21 on the outer circumferential surface away from the vent hole 13 and / or on the inner circumferential surface toward the vent hole 13.

[0040] More specifically, if Figure 1 and Figure 4 As shown, the explosion-proof valve 100 includes a body 1, a bursting portion 3 and a first bent portion 2. A vent hole 13 is provided on the body 1, the body 1 is used to be connected to the main body of the battery, the vent hole 13 is communicated with the exhaust hole on the main body, the body 1 can be installed at the exhaust hole of the main body of the battery by welding or bonding, so that the exhaust hole is communicated with the vent hole 13, and the gas in the battery can be discharged through the exhaust hole and the vent hole 13.

[0041] Further explanation, the bursting part 3 is connected to the body 1 through the first bent part 2 and closes the vent 13. Since the bursting part 3 is arranged on the vent 13, the bursting part 3 is connected to the body 1 through the first bent part 2, so it can be seen in the radial cross section of the explosion-proof valve 100 that there is an angle between the bursting part 3 and the body 1, and the first bent part 2 is located at the angle and forms a connection part.

[0042] Further explanation, a thinning score 21 is provided on the outer circumference of the first bend portion 2 away from the vent hole 13, and / or a thinning score 21 is provided on the inner circumference of the first bend portion 2 facing the vent hole 13. In one embodiment, the thinning score 21 is provided on the outer circumference of the first bend portion 2; in another embodiment, the thinning score 21 is provided on the inner circumference of the first bend portion 2; in another embodiment, the thinning score 21 is provided on both the inner circumference and the outer circumference of the first bend portion 2. Preferably, the thinning score 21 is provided on the outer circumference of the first bend portion 2, which has the advantage of being easy to process.

[0043] Further explanation: the bursting part 3 is connected to the main body 1 through the first bending part 2, so the first bending part 2 is bent. The structural strength of the bending structure is weaker than that of the planar structure. A thinning notch 21 is provided on the circumferential surface of the first bending part 2 to reduce the pressure required to open the valve.

[0044] The first bending portion 2 may be in an arc shape, and the first bending portion 2 is a fillet formed between the bursting portion 3 and the main body 1 .

[0045] The first bent portion 2 is provided with thinning notches 21 around its circumference, so that the explosion-proof valve 100 can open quickly when opening the valve, thereby improving the power safety of the battery.

[0046] In an optional embodiment, the body 1 is a mounting portion 12, and the mounting portion 12 is connected to the bursting portion 3 through the first bending portion 2. The body 1 is a mounting portion 12, one end of the mounting portion 12 is connected to the main body of the battery, and the other end of the mounting portion 12 is connected to the bursting portion 3 through the first bending portion 2.

[0047] In another optional embodiment, the main body 1 also includes a mounting portion 12 and a supporting portion 11, the supporting portion 11 protrudes toward a side away from the mounting portion 12, and the mounting portion 12 extends along the outer circumference of the supporting portion 11 in a direction away from the supporting portion 11; the vent 13 extends from the bottom end of the supporting portion 11 to the top end of the supporting portion 11.

[0048] Optionally, one end of the supporting portion 11 is connected to the bursting portion 3 through the first bending portion 2 .

[0049] Optionally, the body 1 further includes a second bending portion 14 , and the other end of the support portion 11 is connected to the mounting portion 12 via the second bending portion 14 .

[0050] It is further explained that the mounting portion 12 is used to connect with the main body of the battery, and the supporting portion 11 is used to connect with the blasting portion 3 .

[0051] More specifically, if Figure 5 and Figure 6 As shown, the mounting portion 12 is connected to the support portion 11 through the second bending portion 14, and the mounting portion 12 extends on the outer periphery of the support portion 11 in a direction away from the support portion 11, and the support portion 11 protrudes to a side away from the mounting portion 12, and the bursting portion 3 is arranged on a side of the support portion 11 away from the mounting portion 12, and the support portion 11 and the bursting portion 3 are connected through the first bending portion 2. The mounting portion 12, the support portion 11 and the bursting portion 3 are in a cap-shaped structure.

[0052] Further explanation, the bursting part 3 is a thin sheet, which can be a disc, a racetrack-shaped sheet or a thin sheet of other shapes; the mounting part 12 is an annular thin sheet, the outer ring can be a racetrack-shaped, circular or other shape, and the inner ring can be circular, racetrack-shaped or other shapes; the support part 11 can be a thin-walled tube of a racetrack-shaped, circular or other shape, and the vent 13 extends from the bottom end of the support part 11 to the top end of the support part 11, and the vent 13 can be circular, racetrack-shaped or other shapes. The edge of the bursting part 3 is connected along the edge of the vent 13 through the first bending part 2, so that the vent 13 is closed by the bursting part 3. More specifically, the shape of the inner ring of the mounting part 12 is the same as that of the support part 11, which facilitates the connection between the mounting part 12 and the support part 11, and the shape of the vent 13 is the same as that of the bursting part 3, so that the bursting part 3 facilitates the closing of the vent 13. The outer diameter of the mounting portion 12 is in the range of 2mm-5mm; the mounting portion 12 is used to connect with the cover plate or shell of the battery, and can be connected by welding or bonding to form a reliable connection relationship between the explosion-proof valve 100 and the battery.

[0053] In an optional implementation, the thickness of the mounting portion 12 is greater than the thickness of the supporting portion 11 .

[0054] Further explanation: the mounting portion 12 is an annular plate, and the supporting portion 11 is a thin-walled tube. If the thickness of the annular plate is uniform and the wall thickness of the thin-walled tube is uniform, the thickness of the mounting portion 12 is greater than the thickness of the supporting portion 11; if the thickness of the annular plate is uneven and the wall thickness of the thin-walled tube is uneven, the minimum thickness of the annular portion is greater than the maximum wall thickness of the thin-walled tube.

[0055] More specifically, the mounting portion 12 is used to connect with the main body of the battery, so the mounting portion 12 needs to form a reliable connection relationship with the battery. The support portion 11 is used to support the bursting portion 3 and form a connection relationship with the bursting portion 3. However, when the internal pressure of the battery is high, the bursting portion 3 needs to fall off from the support portion 11. Therefore, setting the thickness of the mounting portion 12 to be greater than the thickness of the support portion 11 can enable the mounting portion 12 to form a reliable connection relationship with the battery, and the bursting portion 3 can be separated from the support portion 11 under the action of the internal pressure of the battery.

[0056] In this embodiment, the plane extending from the mounting portion 12 to the second bending portion 14 forms a first angle a with the plane extending from the supporting portion 11 to the second bending portion 14, and the plane extending from the blasting portion 3 to the first bending portion 2 forms a second angle b with the plane extending from the supporting portion 11 to the first bending portion 2; the first angle a is an obtuse angle, and the second angle b is an acute angle.

[0057] More specifically, if Figure 7As shown, the mounting portion 12 is connected to the support portion 11 through the second bending portion 14, the mounting portion 12 is connected to the second bending portion 14, the support portion 11 is also connected to the second bending portion 14, the plane of the mounting portion 12 extending in the direction of the second bending portion 14 intersects with the plane of the support portion 11 extending in the direction of the second bending portion 14 and forms a first angle a; the bursting portion 3 is connected to the support portion 11 through the first bending portion 2, the support portion 11 is connected to the first bending portion 2, the bursting portion 3 is also connected to the first bending portion 2, the plane of the support portion 11 extending in the direction of the first bending portion 2 intersects with the plane of the bursting portion extending in the direction of the first bending portion 2 and forms a second angle b. The first angle a is an obtuse angle, and the second angle b is an acute angle.

[0058] The gas in the battery is discharged after the bursting part 3 is opened from the direction of the mounting part 12 along the direction of the protrusion of the support part 11. When the first angle a is an obtuse angle and the second angle b is an acute angle, the gas pressure gradually increases during the discharge process, and the bursting part 3 can be opened quickly to discharge the gas. Therefore, when the gas pressure in the battery is the same, when the first angle a is an obtuse angle and the second angle b is an acute angle, the gas pressure required to open the bursting part 3 is smaller.

[0059] Further explanation, the first angle a is complementary to the second angle b. Therefore, the mounting portion 12 and the blasting portion 3 are arranged in parallel, and when the gas is discharged, the gas pressure at the blasting portion 3 is not much different, which can prevent the gas from gathering in one position, thereby avoiding local explosions, thereby improving the safety of electricity use.

[0060] In a preferred embodiment, the first angle a is in the range of 90°-120°, and the second angle b is in the range of 60°-90°. When the first angle a and the second angle b are within this range, it is beneficial to process the explosion-proof valve 100 on the one hand, and the required valve opening pressure is relatively small on the other hand.

[0061] like Figure 2 and Figure 3 As shown, the thinning notch 21 is provided in a part of the first bent portion 2. That is, after the explosion-proof valve 100 is opened, the portion of the first bent portion 2 provided with the thinning notch 21 will cause the bursting portion 3 to be separated from the body 1, while the portion of the first bent portion 2 not provided with the thinning notch 21 will cause the bursting portion 3 to be connected to the body 1, thereby preventing the bursting portion 3 from being separated from the body 1 when the valve is opened, thereby preventing the bursting portion 3 from causing secondary damage under the action of pressure.

[0062] In an optional embodiment, the thickness of the first bending portion 2 is 0.2 mm-1 mm, and / or the depth of the thinning score 21 is 0.1 mm-0.15 mm. Further, the thinning score 21 can be formed by stamping, laser etching and other processes. The thickness of the bursting portion 3 is between 0.2 mm and 1 mm, and the depth of the thinning score 21 is between 0.1 mm and 0.15 mm. When processing the thinning score 21, the precision requirement is relatively low, which is convenient for processing.

[0063] In an optional implementation, the bottom width of the cross section of the thinning notch 21 is smaller than the top width.

[0064] More specifically, if Figure 6 As shown, the bottom width of the cross section of the thinned notch 21 is smaller than the top width.

[0065] In the embodiment where the thinning notch 21 is arranged on the outer peripheral surface of the first bend 2 away from the vent hole 13, the bottom end of the cross section of the thinning notch 21 is one end close to the inner peripheral surface of the first bend 2, and the top end of the cross section of the thinning notch 21 is one end close to the outer peripheral surface of the first bend 2, so the width of the thinning notch 21 close to the outer peripheral surface of the first bend 2 is greater than the width of the inner peripheral surface close to the first bend 2, and the end of the thinning notch 21 close to the inner peripheral surface of the first bend 2 is connected to the bursting part 3 and the body 1, so the connection width between the bursting part 3 and the body 1 is small. When the internal pressure of the battery is high and the valve needs to be opened, the connection width between the bursting part 3 and the body 1 is small, so the pressure required to open the valve can be further reduced to improve the power safety of the battery.

[0066] In the embodiment where the thinning notch 21 is arranged on the inner circumference of the first bend 2 near the vent hole 13, the bottom end of the cross section of the thinning notch 21 is one end near the outer circumference of the first bend 2, and the top end of the cross section of the thinning notch 21 is one end near the inner circumference of the first bend 2. The width of the outer circumference of the thinning notch 21 near the first bend 2 is smaller than the width of the outer circumference near the first bend 2, and one end of the outer circumference of the thinning notch 21 near the first bend 2 is used to connect the bursting part 2 and the body 1, so the connection width between the bursting part 3 and the body 1 is small. When the internal pressure of the battery is high and the valve needs to be opened, the connection width between the bursting part 3 and the body 1 is small, so the pressure required to open the valve can be further reduced to improve the power safety of the battery.

[0067] To further illustrate, the cross-sectional shape of the thinning notch 21 is trapezoidal or semicircular, so as to further reduce the pressure required to open the valve, thereby improving the power safety of the battery.

[0068] In an optional implementation, the area of ​​the vent hole 13 accounts for more than 50% of the area of ​​the body 1 to ensure the exhaust speed after the valve is opened, further improving the power safety of the battery.

[0069] According to the second aspect of the embodiment of the present application, a battery is provided, comprising the above-mentioned explosion-proof valve 100. The battery also includes a main body, and the explosion-proof valve 100 is arranged on the main body. In the case of thermal runaway, the battery will quickly release the gas and heat generated inside it. If the pressure is not relieved and the temperature is not reduced in time, it is very likely to cause the battery to catch fire and explode or cause other serious consequences. The battery is provided with an explosion-proof valve 100, and the gas inside the battery is discharged through the explosion-proof valve 100.

[0070] According to a third aspect of an embodiment of the present application, there is provided a battery pack, comprising the explosion-proof valve 100 described above; or comprising the battery described above.

[0071] According to a fourth aspect of the embodiments of the present application, there is provided an electrical device comprising the above-mentioned battery or the above-mentioned battery pack.

[0072] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An explosion-proof valve, characterized in that: include: A main body, wherein the main body is provided with a vent hole; The bursting part is connected to the main body through a first bending part and closes the vent hole. The first bending part is provided with a thinning notch away from the outer peripheral surface of the vent hole and / or toward the inner peripheral surface of the vent hole.

2. The explosion-proof valve according to claim 1, characterized in that: The main body is a mounting portion, and the mounting portion is connected to the blasting portion through the first bending portion.

3. The explosion-proof valve according to claim 1, characterized in that: The main body includes a mounting portion and a supporting portion, the supporting portion protrudes toward a side away from the mounting portion, and the mounting portion extends along the outer circumference of the supporting portion toward a direction away from the supporting portion; the vent hole extends from the bottom end of the supporting portion to the top end of the supporting portion.

4. The explosion-proof valve according to claim 3, characterized in that: One end of the supporting portion is connected to the bursting portion through the first bending portion.

5. The explosion-proof valve according to claim 4, characterized in that: The main body further includes a second bending portion, and the other end of the supporting portion is connected to the mounting portion through the second bending portion.

6. The explosion-proof valve according to claim 3, characterized in that: The thickness of the mounting portion is greater than the thickness of the supporting portion.

7. The explosion-proof valve according to claim 5, characterized in that: The plane extending from the mounting portion to the second bending portion forms a first angle with the plane extending from the supporting portion to the second bending portion, and the plane extending from the bursting portion to the first bending portion forms a second angle with the plane extending from the supporting portion to the first bending portion; the first angle is an obtuse angle, and the second angle is an acute angle.

8. The explosion-proof valve according to claim 7, characterized in that: The second angle ranges from 60° to 90°.

9. The explosion-proof valve according to claim 7, characterized in that: The first angle is complementary to the second angle.

10. The explosion-proof valve according to any one of claims 1 to 9, characterized in that: The thinning notch is disposed in a partial area of ​​the first bending portion.

11. The explosion-proof valve according to any one of claims 1 to 9, characterized in that: The thickness of the first bending portion is 0.2 mm-1 mm, and / or the depth of the thinning notch is 0.1 mm-0.15 mm.

12. The explosion-proof valve according to any one of claims 1 to 9, characterized in that: The bottom width of the cross section of the thinned notch is smaller than the top width.

13. The explosion-proof valve according to claim 12, characterized in that: The cross-sectional shape of the thinning notch is trapezoidal or semicircular.

14. A battery, characterized in that: Comprising an explosion-proof valve as described in any one of claims 1-13.

15. A battery pack, characterized in that: Comprising the explosion-proof valve as described in any one of claims 1-13; or comprising the battery as described in claim 14.

16. An electrical device, characterized in that: Comprising the battery as claimed in claim 14 or the battery pack as claimed in claim 15.

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