Explosion-proof valve and battery

Abstract

The utility model discloses an explosion-proof valve and a battery, the explosion-proof valve comprises a body, the body is provided with a nick and a buffer groove, and the nick and the buffer groove are both runway-shaped; the nick comprises a deep groove section and a shallow groove section, the depth of the shallow groove section is D, the distance between the bottom wall of the shallow groove section and the bottom wall of the body is T1, and the distance between the bottom wall of the deep groove section and the bottom wall of the body is T2; the distance between the bottom wall of the buffer groove and the bottom wall of the body is T3; wherein D is greater than 0, T3 is greater than T2, and T1 is greater than T2. According to the anti-explosion valve disclosed by the utility model, the buffer groove is arranged, so that the stress borne by the nick can be greatly reduced under the working conditions of battery cell production, pack assembly and whole vehicle vibration, and the fatigue cracking failure caused by overlarge stress borne by the nick is prevented; the nick is in a runway shape and comprises the deep groove section and the shallow groove section, and the depth of the shallow groove section is not zero, so that the set opening pressure of the anti-explosion valve can be effectively reduced while the manufacturing cost is reduced.

Description

Technical Field

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

[0002] As a key functional part of the battery, the explosion-proof valve can play a good explosion-proof effect and ensure the safety of electric vehicles that use power batteries as energy sources. The set opening pressure of the explosion-proof valve of batteries of different models or functions is different. The set opening pressure of the explosion-proof valve of some batteries needs to be set relatively small, but due to the influence of technology such as process, the manufacturing cost of the explosion-proof valve with a relatively small opening pressure is relatively high. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an explosion-proof valve, which can effectively reduce the manufacturing cost of the explosion-proof valve with a small opening pressure.

[0004] The utility model also provides a battery with the explosion-proof valve.

[0005] The explosion-proof valve according to the first embodiment of the utility model comprises:

[0006] The body is provided with notches and buffer grooves, and the notches and buffer grooves are both in the shape of a racetrack;

[0007] The notch includes a deep groove section and a shallow groove section, the depth of the shallow groove section is D, and the distance between the bottom wall of the shallow groove section and the bottom wall of the body is T. 1 The distance between the bottom wall of the deep groove section and the bottom wall of the body is T 2 ;

[0008] The distance between the bottom wall of the buffer groove and the bottom wall of the body is T 3 ;

[0009] Where D>0, T 3 >T 2 , T 1 >T 2 .

[0010] The explosion-proof valve according to the embodiment of the utility model has at least the following beneficial effects:

[0011] By setting up a buffer groove, the stress on the notch can be greatly reduced during battery cell production, pack assembly and vehicle vibration conditions, thereby preventing the notch from being subjected to excessive stress and causing fatigue cracking failure; the notch can break and open when the body is subjected to a pressure above the preset pressure value, thereby ensuring timely pressure relief when the internal air pressure rises abnormally due to thermal runaway of the battery cell, thereby preventing the battery cell from exploding; the notch is runway-shaped, and the notch includes a deep groove section and a shallow groove section, the depth of the shallow groove section is not zero, which can effectively reduce the set opening pressure of the explosion-proof valve while reducing manufacturing costs.

[0012] According to some embodiments of the present invention, the distance T between the bottom wall of the shallow groove section and the bottom wall of the body is 1 The distance T between the bottom wall of the buffer tank and the bottom wall of the body 3 Satisfaction: T 3 >T 1 .

[0013] According to some embodiments of the present invention, the notch is arranged on the periphery of the buffer groove, or the buffer groove is arranged on the periphery of the notch.

[0014] According to some embodiments of the present invention, the length of the shallow groove section accounts for 1 / 10 to 1 / 3 of the total length of the notch.

[0015] According to some embodiments of the present invention, the cross-sectional shape of the shallow groove section is an inverted trapezoid, and / or the cross-sectional shape of the deep groove section is an inverted trapezoid.

[0016] According to some embodiments of the present invention, the width of the top of the notch is 0.2 mm to 0.6 mm.

[0017] According to some embodiments of the present invention, the top width of the shallow groove section is W 1 , the top width of the deep groove section is W 2 , where W 1 =W 2 .

[0018] According to some embodiments of the present invention, the distance T1 between the bottom wall of the shallow groove section and the bottom wall of the body has a numerical range of: T 1 =30μm~100μm.

[0019] According to some embodiments of the present invention, the depth of the buffer groove is greater than the depth of the notch, and / or the width of the buffer groove is greater than the width of the notch.

[0020] The battery according to the second embodiment of the utility model includes the above-mentioned explosion-proof valve; since the battery includes the above-mentioned explosion-proof valve, it has at least all the beneficial effects of the explosion-proof valve. The explosion-proof valve of this embodiment can greatly reduce the stress on the notch under the conditions of battery cell production, pack assembly and vehicle vibration by setting a buffer groove, thereby preventing the notch from being subjected to excessive stress and causing fatigue cracking failure; the notch can break and open when the body is subjected to a pressure above the preset pressure value, thereby ensuring timely pressure relief when the internal air pressure of the battery cell abnormally increases due to thermal runaway, preventing the battery cell from exploding; the notch is in the shape of a runway, and the notch includes a deep groove section and a shallow groove section, and the depth of the shallow groove section is not zero, which can effectively reduce the set opening pressure of the explosion-proof valve while reducing manufacturing costs.

[0021] 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

[0022] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic structural diagram of an explosion-proof valve according to an embodiment of the first aspect of the utility model;

[0024] Figure 2 It is a cross-sectional view of the first embodiment of the explosion-proof valve of the utility model;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 for Figure 2 The enlarged view of point B in the middle;

[0027] Figure 5 It is a cross-sectional view of a second embodiment of the explosion-proof valve of the utility model;

[0028] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0029] Figure 7 for Figure 5 Enlarged view of point D in the middle.

[0030] Figure Number:

[0031] Ontology 100;

[0032] Score 200, shallow groove section 210, deep groove section 220;

[0033] Buffer tank 300. DETAILED DESCRIPTION

[0034] 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.

[0035] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] As a key functional part in the battery, the explosion-proof valve can be opened to release the pressure inside the battery when the internal pressure of the battery reaches the set pressure of the explosion-proof valve, thereby preventing the battery from exploding. However, there is currently a problem that the manufacturing cost of the explosion-proof valve is high when the set pressure for battery explosion-proof is relatively low. In order to solve the above technical problems, this embodiment provides an explosion-proof valve that can effectively reduce the manufacturing cost of explosion-proof valves with relatively low set pressures. The explosion-proof valve of this embodiment is described in detail below in conjunction with the accompanying drawings.

[0039] Reference Figures 1 to 7The explosion-proof valve of the embodiment of the utility model includes a main body 100, on which a notch 200 and a buffer groove 300 are arranged. The buffer groove 300 is used to reduce the stress on the notch 200 during battery cell production, pack assembly and vehicle vibration conditions, thereby preventing the notch 200 from being subjected to excessive stress and causing fatigue burst failure; the notch 200 can break and open when the main body 100 is subjected to a pressure above a preset pressure value, thereby ensuring timely pressure relief when the internal air pressure of the battery thermal runaway rises abnormally, thereby preventing the battery from exploding. The distance between the bottom wall of the notch 200 and the bottom wall of the main body 100 will affect the set pressure of the explosion-proof valve. Generally speaking, the larger the distance between the bottom wall of the notch 200 and the bottom wall of the main body 100, the higher the opening pressure of the explosion-proof valve, and the smaller the distance between the bottom wall of the notch 200 and the bottom wall of the main body 100, the lower the opening pressure of the explosion-proof valve. When the explosion-proof valve needs to set a lower opening pressure, it is necessary to reduce the distance between the bottom wall of the notch 200 and the bottom wall of the main body 100. As the distance between the bottom wall of the notch 200 and the bottom wall of the main body 100 becomes smaller, the manufacturing precision will increase accordingly, thereby leading to increased costs. At the same time, if the distance between the bottom wall of the notch 200 and the bottom wall of the main body 100 is too small, it will also increase the difficulty of installing the entire explosion-proof valve and make the notch 200 easily damaged.

[0040] In order to solve the above technical problems, the explosion-proof valve provided in this embodiment makes the notch 200 into a complete runway shape, and is divided into a deep groove section 220 and a shallow groove section 210 according to the depth of the notch 200. The depth of the deep groove section 220 is greater than the depth of the shallow groove section 210, that is, the distance between the bottom wall of the deep groove section 220 and the bottom wall of the main body 100 is smaller than the distance between the bottom wall of the shallow groove section 210 and the bottom wall of the main body 100. At present, the notch 200 of most explosion-proof valves is not a complete runway shape, but a connecting portion is used to connect the peripheral portion and the central portion of the body 100, and the thickness of the connecting portion is basically the same as the thickness of the body 100; that is, the connecting portion of the conventional explosion-proof valve is equivalent to the shallow groove section 210 in this embodiment, and the notch 200 of the conventional explosion-proof valve is equivalent to the deep groove section 220 in this embodiment. By making the notch 200 into a complete runway shape and dividing the notch 200 into the deep groove section 220 and the shallow groove section 210, the depth of the deep groove section 220 in this embodiment is the same as the depth of the conventional notch 200. Under the same conditions, the opening pressure of the explosion-proof valve of the present embodiment can be significantly reduced; that is, if the opening pressure of the explosion-proof valve of the present embodiment is the same as that of the conventional explosion-proof valve, the depth of the deep groove section 220 of the explosion-proof valve of the present embodiment can be shallower than the depth of the notch 200 of the conventional explosion-proof valve, so the processing accuracy requirement is also lower, thereby effectively reducing the production cost; at the same time, the shallow groove section 210 can also play the same role as the connecting part of the conventional explosion-proof valve; when the deep groove section 220 is cracked, the shallow groove section 210 can still be used to connect the peripheral part and the central part of the body 100, thereby avoiding the central part of the body 100 from flying out and causing damage.

[0041] In order to facilitate understanding of the technical solution of this embodiment, refer to Figures 2 to 7 As shown, the depth of the shallow groove section 210 is D, and the distance between the bottom wall of the shallow groove section 210 and the bottom wall of the body 100 is T 1 The distance between the bottom wall of the deep groove section 220 and the bottom wall of the body 100 is T 2 , then there exists: D>0, T 1 >T 2 .

[0042] Furthermore, the distance between the bottom wall of the buffer groove 300 and the bottom wall of the body 100 is T 3 , then T 3 >T 2 The purpose is to ensure that when the pressure inside the battery cell increases, the explosion-proof valve is cracked at the notch 200 instead of the buffer groove 300. At the same time, the buffer groove 300 can also have a better buffering effect, so that the notch 200 of the explosion-proof valve can remain intact during the installation process.

[0043] In the embodiment of the utility model, the body 100 of the embodiment is in the shape of a racetrack, and the buffer groove 300 is also in the shape of a racetrack. The racetrack-shaped body 100 and buffer groove 300 have a wide range of applications and can be applied to a variety of different batteries. Of course, the body 100 and buffer groove 300 can also be changed to other shapes according to actual needs; similarly, the notch 200 can also be changed to other shapes according to actual conditions.

[0044] Further, in the embodiment of the present invention, the depth of the buffer groove 300 is greater than the depth of the notch 200, and / or the width of the buffer groove 300 is greater than the width of the notch 200. Specifically, it is preferred that the depth of the buffer groove 300 is greater than the depth of the notch 200 and the width of the buffer groove 300 is greater than the width of the notch 200, because the buffer groove 300 mainly plays the role of protecting the notch 200. If the width or depth of the buffer groove 300 is less than the notch 200, it is difficult to achieve the corresponding technical effect. Therefore, it is preferred that the depth is greater than the depth of the notch 200 and the width of the buffer groove 300 is greater than the width of the notch 200. It is conceivable that, according to actual conditions, only the depth of the buffer groove 300 can be selected to be greater than the depth of the notch 200, or only the width of the buffer groove 300 can be selected to be greater than the width of the notch 200.

[0045] In the embodiments of the present invention, referring to Figures 2 to 7 As shown, the distance T between the bottom wall of the shallow groove section 210 and the bottom wall of the body 100 is 1 The distance T between the bottom wall of the buffer tank 300 and the bottom wall of the body 100 3 Satisfaction: T 3 >T 1 Specifically, the distance between the bottom wall of the buffer groove 300 and the bottom wall of the main body 100 is greater than the distance between the bottom wall of the shallow groove section 210 and the bottom wall of the main body 100, which can prevent the buffer groove 300 from cracking before the shallow groove section 210, thereby preventing the central part of the main body 100 from flying out. However, it can be imagined that the explosion-proof valve is first cracked by the deep groove section 220, so the distance between the bottom wall of the buffer groove 300 and the bottom wall of the main body 100 can also be equal to or less than the distance between the bottom wall of the shallow groove section 210 and the bottom wall of the main body 100, but it is preferred that the distance between the bottom wall of the buffer groove 300 and the bottom wall of the main body 100 is greater than the distance between the bottom wall of the shallow groove section 210 and the bottom wall of the main body 100.

[0046] In the embodiment of the present utility model, the length of the shallow groove section 210 accounts for 1 / 10 to 1 / 3 of the total length of the notch 200. Specifically, as can be seen from the above, the deep groove section 220 is the main function of bursting pressure relief, so the shallow groove section 210 cannot be too long. If the shallow groove section 210 is too long, it will affect the opening of the explosion-proof valve, or cause the opening pressure of the explosion-proof valve to increase. Therefore, according to experience and numerical calculations, it is preferred that the length of the shallow groove section 210 only accounts for 1 / 10 to 1 / 3 of the total length of the notch 200.

[0047] Furthermore, the notch 200 in the present embodiment is composed of a shallow groove section 210 and a deep groove section 220, that is, the notch 200 in the present embodiment cannot be composed of a plurality of shallow groove sections 210 and deep groove sections 220 that are spaced apart. The notch 200 is composed of only one shallow groove section 210 and one deep groove section 220, so the pressure relief effect is better and the manufacturing cost is lower.

[0048] In the embodiment of the utility model, the cross-sectional shape of the shallow groove section 210 is an inverted trapezoid, and / or the cross-sectional shape of the deep groove section 220 is an inverted trapezoid. Specifically, setting the cross-sectional shape of the deep groove section 220 to an inverted trapezoid can effectively increase the bursting size of the notch 200, thereby improving the bursting effect; since the shallow groove section 210 does not need to burst, the shallow groove section 210 can be set to a suitable cross-sectional shape according to actual conditions, but the cross-sectional shapes of the deep groove section 220 and the shallow groove section 210 are both designed to be inverted trapezoids, and the same mold can be used for production, thereby reducing production costs. Therefore, it is preferred that the cross-sectional shapes of the shallow groove section 210 and the deep groove section 220 are both set to inverted trapezoids.

[0049] Furthermore, the connection between the shallow groove section 210 and the deep groove section 220 is preferably arranged with a uniform transition, which can effectively reduce the transition stress and thus improve the stability of the explosion-proof valve.

[0050] In the embodiment of the utility model, the width of the top of the notch 200 is 0.2mm to 0.6mm. Specifically, as can be seen from the above, the cross-sectional shapes of the deep groove section 220 and the shallow groove section 210 are preferably the same, so the width of the top of the notch 200 includes both the width of the top of the deep groove section 220 and the width of the top of the shallow groove section 210; if the width of the top of the notch 200 is too large, the stability of the explosion-proof valve will be deteriorated, and if the width of the top of the notch 200 is too small, it is easy to affect the stability of the explosion-proof valve. Therefore, it is preferred that the width is 0.2mm to 0.6mm. Within this numerical range, the stability of the explosion-proof valve is better.

[0051] In the embodiments of the present invention, referring to Figures 2 to 7 As shown, the top width of the shallow groove section 210 is W 1 , the top width of the deep groove section 220 is W 2 , where W 1 =W 2 Specifically, the width of the top of the deep groove section 220 is the same as the width of the top of the shallow groove section 210 to reduce production costs, but it can also be adjusted according to actual conditions.

[0052] In the embodiment of the present invention, the distance T1 between the bottom wall of the shallow groove section 210 and the bottom wall of the body 100 has a value range of: T 1 =30μm~100μm. For details, refer to Figure 3 , Figure 6 As shown, it can be seen from the above that the shallow groove section 210 mainly serves to connect the peripheral part and the central part of the main body 100. Therefore, the distance between the bottom wall of the shallow groove section 210 and the bottom wall of the main body 100 is preferably 30μm to 100μm, which can ensure the stability of the explosion-proof valve and avoid the shallow groove section 210 from bursting.

[0053] In an embodiment of the utility model, the recessed directions of the notch 200 and the buffer groove 300 in this embodiment may be the same or opposite. For example, the recessed directions of the notch 200 and the buffer groove 300 shown in the accompanying drawings are the same and both are recessed downward, but according to actual circumstances, the notch 200 and the buffer groove 300 may both be designed to be recessed upward, or the notch 200 may be recessed downward and the buffer groove 300 may be recessed upward, or the notch 200 may be recessed upward and the buffer groove 300 may be recessed downward.

[0054] In the embodiment of the present invention, the notch 200 is arranged on the periphery of the buffer groove 300, or the buffer groove 300 is arranged on the periphery of the notch 200. Specifically, the buffer groove 300 is arranged on the periphery of the notch 200. Figures 2 to 4 As shown, in the solution where the buffer groove 300 is arranged on the periphery of the notch 200, the buffer groove 300 has a better protection effect on the notch 200, thereby improving the stability of the explosion-proof valve; the notch 200 is arranged on the periphery of the buffer groove 300 as shown in FIG. Figures 5 to 7 As shown, in the scheme where the notch 200 is arranged on the periphery of the buffer groove 300, the size of the buffer groove 300 can be designed to be larger without affecting the size of the notch 200, and the opening area of ​​the explosion-proof valve when it bursts is also larger, so the pressure relief rate can be effectively increased and the explosion risk of the battery cell when it is thermally runaway can be reduced. Either of the above two schemes can be selected according to actual conditions.

[0055] The utility model also discloses a battery, which includes a cover plate assembly and the explosion-proof valve, and the explosion-proof valve is installed on the cover plate assembly. Since the battery of this embodiment includes the explosion-proof valve, it has at least all the beneficial effects of the explosion-proof valve, which will not be described in detail here.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0057] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An explosion-proof valve, characterized in that: include: The body is provided with notches and buffer grooves, and the notches and buffer grooves are both in the shape of a racetrack; The notch includes a deep groove section and a shallow groove section, the depth of the shallow groove section is D, the distance between the bottom wall of the shallow groove section and the bottom wall of the body is T1, and the distance between the bottom wall of the deep groove section and the bottom wall of the body is T2; The distance between the bottom wall of the buffer tank and the bottom wall of the body is T3; Among them, D>0, T3>T2, T1>T2.

2. The explosion-proof valve according to claim 1, characterized in that: The distance T1 between the bottom wall of the shallow groove section and the bottom wall of the main body and the distance T3 between the bottom wall of the buffer groove and the bottom wall of the main body satisfy: T3>T1.

3. The explosion-proof valve according to claim 1, characterized in that: The notch is arranged on the periphery of the buffer groove, or the buffer groove is arranged on the periphery of the notch.

4. The explosion-proof valve according to claim 1, characterized in that: The length of the shallow groove section accounts for 1 / 10 to 1 / 3 of the total length of the notch.

5. The explosion-proof valve according to claim 1, characterized in that: The cross-sectional shape of the shallow groove section is an inverted trapezoid, and / or the cross-sectional shape of the deep groove section is an inverted trapezoid.

6. The explosion-proof valve according to claim 1, characterized in that: The width of the top of the notch is 0.2 mm to 0.6 mm.

7. The explosion-proof valve according to claim 6, characterized in that: The top width of the shallow groove section is W1, and the top width of the deep groove section is W2, wherein W1=W2.

8. The explosion-proof valve according to claim 1, characterized in that: The distance T1 between the bottom wall of the shallow groove section and the bottom wall of the main body has a numerical range of: T1 = 30 μm to 100 μm.

9. The explosion-proof valve according to claim 1, characterized in that: The depth of the buffer groove is greater than the depth of the notch, and / or the width of the buffer groove is greater than the width of the notch.

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

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