Anti-explosion valve, battery cover plate and battery

Abstract

The utility model provides an anti-explosion valve, a battery cover plate and a battery, the anti-explosion valve comprises an anti-explosion piece, the anti-explosion piece is provided with a first opening area and a second opening area, the area of the first opening area is larger than that of the second opening area, and the second opening area is larger than that of the first opening area; the orthographic projection of the second opening area on the anti-explosion piece is located in the orthographic projection of the first opening area on the anti-explosion piece. Wherein at least one part of the periphery of the first opening area is provided with a first anti-explosion nick, at least one part of the periphery of the second opening area is provided with a second anti-explosion nick, and the opening pressure of the first anti-explosion nick is larger than that of the second anti-explosion nick. The anti-explosion pressure of the first opening area is larger than that of the second opening area. According to the anti-explosion valve, the preferential opening area can be set, the anti-explosion valve is prevented from being opened by mistake, and thermal runaway is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion-proof valves, and more particularly to an explosion-proof valve, a battery cover plate and a battery. BACKGROUND

[0002] Under the background of rapid development of new energy vehicles and new type of electrochemical energy storage systems, the market demand for secondary batteries as core energy storage units is rapidly expanding. With the continuous expansion of application fields, the requirements for the performance of secondary batteries are becoming increasingly stringent, especially safety, which has become the most critical factor in the development of battery technology.

[0003] The explosion-proof valve is a key component in the safety design of secondary batteries, mainly used to provide a pressure release path when the internal pressure of the battery abnormally rises, preventing the battery case from rupturing or thermal runaway, thereby protecting the battery structure, maintaining battery performance and improving overall safety. It helps battery products meet safety standards and prevent safety accidents such as fires or explosions. In addition, the activation of the explosion-proof valve can also serve as an intuitive indication of battery safety issues, prompting appropriate measures to ensure the safety and compliance of the battery system in various application scenarios.

[0004] The size of the explosion-proof valve opening has a significant impact on the safety of the battery. The opening of the explosion-proof valve in the prior art is usually fixed in size, and a single-stage valve opening scheme is adopted. When the explosion-proof valve is set too large, the battery rapidly sprays flammable substances and flammable gases, and the sprayed flammable substances are often at a very high temperature, which can ignite the sprayed flammable gases when they come into contact with oxygen, causing severe combustion. The internal pressure of the battery rapidly rises as soon as thermal runaway is triggered; and when the explosion-proof valve is too small, it may not be able to release pressure in time, which can cause an explosion. CONTENT OF THE UTILITY MODEL

[0005] One purpose of the present application is to provide an explosion-proof valve that can at least solve the technical problem of easy thermal runaway or misvalving caused by the single-stage valve opening of the prior art.

[0006] Another purpose of the present application is to provide a battery cover plate comprising the above-mentioned explosion-proof valve.

[0007] Still another purpose of the present application is to provide a battery comprising the above-mentioned battery cover plate.

[0008] In order to achieve the above purposes, the present application provides the following technical solutions.

[0009] According to the anti-explosion valve of the first aspect of the present application, the anti-explosion valve comprises: an anti-explosion sheet, the anti-explosion sheet has a first opening area and a second opening area, the area of the first opening area is greater than the area of the second opening area, and the orthographic projection of the second opening area on the anti-explosion sheet is located inside the orthographic projection of the first opening area on the anti-explosion sheet; wherein at least a part of the outer periphery of the first opening area is provided with a first anti-explosion notch, at least a part of the outer periphery of the second opening area is provided with a second anti-explosion notch, the opening pressure of the first anti-explosion notch is greater than the opening pressure of the second anti-explosion notch, and the anti-explosion pressure of the first opening area is greater than the anti-explosion pressure of the second opening area.

[0010] Optionally, the depth of the first anti-explosion notch is different from the depth of the second anti-explosion notch.

[0011] Optionally, the shape of the first opening area is a long circle, and / or the shape of the second opening area is a regular circle.

[0012] Optionally, the shape of the first opening area is a long circle, the shape of the second opening area is a regular circle, and the number of the second opening areas is multiple, and the multiple second opening areas are distributed along the long axis direction of the first opening area.

[0013] Optionally, the shape of the first anti-explosion notch and the second anti-explosion notch is a ring, the anti-explosion pressure of the first opening area is 1.5 MPa, the number of the second opening areas is three, the diameter d1 of one of the second opening areas is 0.4 cm < d1 < 0.6 cm, the anti-explosion pressure is 0.5 Mpa-0.7 Mpa, the diameter d2 of another one of the second opening areas is 0.6 cm < d2 < 0.8 cm, the anti-explosion pressure is 0.7 Mpa-0.9 Mpa, and the diameter d3 of the other one of the second opening areas is 0.8 cm < d3 < 1 cm, the anti-explosion pressure is 1 Mpa-1.2 Mpa.

[0014] Optionally, the second opening area with the diameter d2 is located at the center position of the anti-explosion sheet in the long axis direction, the second opening area with the diameter d1 is located at one side of the second opening area with the diameter d2 in the long axis direction, and the second opening area with the diameter d3 is located at the other side of the second opening area with the diameter d2 in the long axis direction.

[0015] Optionally, the opening pressure corresponding to each of the second opening areas is P, the diameter corresponding to each of the second opening areas is d, the thickness corresponding to each of the second opening areas is H, and the depth of the second anti-explosion notch corresponding to each of the second opening areas is h, which satisfy the following relationship: P = a x ; wherein P is 0.5MPa-1.5MPa; and a is a correction coefficient corresponding to the opening of the second opening area (1112).

[0016] Optionally, the outer edge of the first explosion-preventing notch is spaced apart from the outer edge of the second explosion-preventing notch; and / or the shape of at least one of the first explosion-preventing notch and the second explosion-preventing notch is a closed or semi-closed ring.

[0017] The battery cover plate according to an embodiment of the second aspect of the present application comprises: a cover plate body having a mounting hole; and an explosion-proof valve provided in the mounting hole, wherein the explosion-proof valve is any one of the explosion-proof valves described above.

[0018] The battery according to an embodiment of the third aspect of the present application comprises: a shell having a receiving space, wherein the shell is provided with an open end communicating with the receiving space; an electric core installed in the receiving space; and a battery cover plate provided at the open end, wherein the battery cover plate is any one of the battery cover plates described above.

[0019] The explosion-proof valve according to an embodiment of the present application sets a second opening area in a first opening area, sets a first explosion-preventing notch around the first opening area, sets a second explosion-preventing notch around the second opening area, limits the opening pressure of the second explosion-preventing notch to be smaller, sets a preferential opening area, thereby realizing low explosion-proof pressure and preferential opening of the second opening area, and further realizing multi-stage valve opening. The multi-stage opening mode not only avoids the opening of the explosion-proof valve caused by low pressure, but also reduces the ejection of high-temperature substances, reduces the probability of fire, and avoids the explosion caused by the increase of pressure.

[0020] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0022] Fig. 1 is a partial exploded view of a battery cover plate according to an embodiment of the present application;

[0023] Fig. 2 is a structural schematic view of an explosion-proof valve according to an embodiment of the present application;

[0024] Fig. 3 is a partial mounting structure schematic view of a battery according to an embodiment of the present application;

[0025] Fig. 4is a partial exploded view of a battery according to one embodiment of the present application.

[0026] Figure Numbers

[0027] Battery 1000;

[0028] Battery cover 1;

[0029] Explosion-proof valve 11;

[0030] Explosion-proof disc 111; first opening area 1111; second opening area 1112; first explosion-proof notch 1113; second explosion-proof notch 1114;

[0031] Cover plate body 12;

[0032] Shell 2;

[0033] Battery cell 3;

[0034] Sealing nail 41; aluminum nail 42; sealing ring 43; positive electrode column 44; negative electrode connecting piece 45; positive electrode connecting piece 46; negative electrode column 47; lower plastic 48; upper insulating rubber pad 49. DETAILED DESCRIPTION

[0035] 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 arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0037] 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 part of the specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] The explosion-proof valve 11 according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0041] like Figs. 1 to 4 As shown, the explosion-proof valve 11 according to the embodiment of the present application includes a explosion-proof disc 111 .

[0042] Specifically, the rupture disc 111 has a first opening area 1111 and a second opening area 1112, the area of the first opening area 1111 is larger than the area of the second opening area 1112, and the orthographic projection of the second opening area 1112 on the rupture disc 111 is located inside the orthographic projection of the first opening area 1111 on the rupture disc 111. At least a part of the outer periphery of the first opening area 1111 is provided with a first rupture score 1113, at least a part of the outer periphery of the second opening area 1112 is provided with a second rupture score 1114, the opening pressure of the first rupture score 1113 is greater than the opening pressure of the second rupture score 1114, and the rupture pressure of the first opening area 1111 is greater than the rupture pressure of the second opening area 1112.

[0043] In other words, the rupture valve 11 according to the embodiments of the present application is mainly composed of a rupture disc 111, wherein the rupture disc 111 can be divided into a first opening area 1111 and a second opening area 1112, the area of the first opening area 1111 is larger, the area of the second opening area 1112 is smaller, and the second opening area 1112 is located inside the first opening area 1111, that is, the orthographic projection of the second opening area 1112 on the rupture disc 111 is located inside the orthographic projection of the first opening area 1111 on the rupture disc 111. For example, the rupture disc 111 extends along the horizontal direction, under the projection of the projection light in the vertical direction, the second opening area 1112 is located inside the first opening area 1111 and does not exceed the first opening area 1111.

[0044] The rupture disc 111 is provided with a rupture score, for example, the upper surface of the rupture disc 111 is provided with a rupture score. Specifically, at least a part of the outer periphery of the first opening area 1111 is provided with a first rupture score 1113, that is, the first opening area 1111 can be provided with a first rupture score 1113 around the entire outer periphery, at this time the shape of the first rupture score 1113 is a closed ring, or the first opening area 1111 can be provided with a first rupture score 1113 around part of the outer periphery, at this time the shape of the first rupture score 1113 is a semi-closed ring with a notch. Similarly, at least a part of the outer periphery of the second opening area 1112 is provided with a second rupture score 1114, which will not be described here. In addition, when there is only one first opening area 1111 and one or more second opening areas 1112 on the rupture valve 11, the first rupture score 1113 corresponding to the first opening area 1111 can be used as the rupture score for completely opening the rupture valve 11.

[0045] It should be noted that the explosion-proof pressure of the first opening area 1111 is greater than that of the second opening area 1112, and the explosion-proof pressure is low in priority opening, that is, the second opening area 1112 is a priority opening area. It can be seen that by setting the first opening area 1111 and the second opening area 1112, the periphery of the first opening area 1111 and the second opening area 1112 is provided with an explosion-proof notch, the opening pressure of the second explosion-proof notch 1114 is lower, the hierarchical setting of the priority opening area is realized, and then the timely opening of the valve can be met under the premise of considering the structural strength of the explosion-proof disc 111, and the situation of misopening of the valve is not prone to occur.

[0046] In the embodiment, by including the first opening area 1111 and the second opening area 1112 on the explosion-proof disc 111, the first explosion-proof notch 1113 is arranged around the first opening area 1111, the second explosion-proof notch 1114 is arranged around the second opening area 1112, and different opening pressures are arranged for the first explosion-proof notch 1113 and the second explosion-proof notch 1114. When the internal pressure of the battery cell 3 rises, the low-opening-pressure area opens preferentially for initial pressure relief, and when the battery cell 3 is out of control, the high-opening-pressure area, i.e., the secondary and tertiary explosion-proof pressure areas, opens in turn, so that the internal pressure of the battery 1000 is rapidly relieved, and the technical problem of thermal runaway is solved. It should be noted that if two explosion-proof structure valves with different opening pressures are arranged on the battery cover plate 1, the cover plate structure will be more complex, the cost will be greatly increased, and higher requirements will be placed on the design of the internal winding core / stacked core. In addition, when thermal runaway occurs, the temperature in the middle area of the two explosion-proof structure valves is very high, and the combustible substances sprayed out may fall in the middle of the two explosion-proof structure valves and be ignited to cause a fire. In comparison, in the embodiment, by increasing the explosion-proof areas with different opening pressures, such as the first opening area 1111 and the second opening area 1112, on one explosion-proof valve 11, the above technical problems can be successfully solved.

[0047] Therefore, according to the explosion-proof valve 11 of the embodiment of the present application, by arranging the second opening area 1112 in the first opening area 1111, the first explosion-proof notch 1113 is arranged around the first opening area 1111, the second explosion-proof notch 1114 is arranged around the second opening area 1112, the opening pressure of the second explosion-proof notch 1114 is limited to be smaller, and the priority opening area is set, so that the explosion-proof pressure of the second opening area 1112 is low and the priority opening is realized, and then the multi-stage valve opening is realized. The multi-stage opening mode not only can avoid the situation that all the explosion-proof valves 11 are opened at low pressure, but also can reduce the spraying of high-temperature substances, reduce the probability of fire, and avoid the explosion caused by the increase of pressure.

[0048] According to one embodiment of the present application, the depth of the first explosion-proof notch 1113 is less than the depth of the second explosion-proof notch 1114, which can ensure that the explosion-proof pressure of the second opening area 1112 is low and the priority opening is realized.

[0049] In some embodiments of the present application, the first opening area 1111 is in the shape of an oblong, and / or the second opening area 1112 is in the shape of a circle, etc. For example, the number of the second opening areas 1112 is multiple, the multiple second opening areas 1112 are distributed along the long axis direction of the first opening area 1111, and the shapes of the outermost two second opening areas 1112 in the long axis direction can be a circle center, and the shapes of the middle second opening areas 1112 can be other shapes or the same circle center. In the present embodiment, the first opening area 1111 is set to be an oblong, which has the advantage of reducing the horizontal distance, so that the pole, the liquid injection hole, and the explosion-proof valve can be reasonably arranged; based on the shape of the first opening area 1111, the second opening area 1112 adopts a circle, which can make the upper and lower two parts of the explosion-proof sheet 111 in the axial direction more easily used, while ensuring that the first explosion-proof notch 1113 and the second explosion-proof notch 1114 have a certain distance, so as to avoid mutual influence when the valve is opened.

[0050] According to one embodiment of the present application, the first opening area 1111 is in the shape of an oblong, the second opening area 1112 is in the shape of a circle, and the number of the second opening areas 1112 is multiple, the multiple second opening areas 1112 are distributed along the long axis direction of the first opening area 1111, which can further ensure that the second explosion-proof notch 1114 has a certain distance, so as to avoid mutual influence when the valve is opened.

[0051] In some embodiments of the present application, the shapes of the first explosion-proof notch 1113 and the second explosion-proof notch 1114 are both annular, the explosion-proof pressure of the first opening area 1111 is 1.5 MPa, the number of the second opening areas 1112 is three, the diameter d1 of one second opening area 1112 is 0.4 cm < d1 < 0.6 cm, for example, d1 is 0.42 cm, 0.45 cm, 0.48 cm, 0.50 cm, 0.52 cm, 0.54 cm, 0.56 cm, 0.58 cm, or 0.59 cm, etc.; the explosion-proof pressure of the second opening area 1112 is 0.5 MPa-0.7 MPa, for example, the explosion-proof pressure is 0.5 MPa, 0.51 MPa, 0.52 MPa, 0.54 MPa, 0.55 MPa, 0.58 MPa, 0.60 MPa, 0.62 MPa, 0.64 MPa, 0.65 MPa, 0.68 MPa, 0.69 MPa, or 0.7 MPa, etc.

[0052] A diameter d2 of the second opening area 1112 is 0.6 cm < d2 < 0.8 cm, for example, d2 is 0.62 cm, 0.64 cm, 0.65 cm, 0.68 cm, 0.69 cm, 0.70 cm, 0.72 cm, 0.74 cm, 0.76 cm, 0.78 cm, or 0.79 cm, etc.; the anti-explosion pressure of the second opening area 1112 is 0.7 Mpa-0.9 Mpa, for example, the anti-explosion pressure is 0.7 Mpa, 0.71 Mpa, 0.73 Mpa, 0.74 Mpa, 0.75 Mpa, 0.76 Mpa, 0.78 Mpa, 0.80 Mpa, 0.82 Mpa, 0.84 Mpa, 0.86 Mpa, 0.88 Mpa, or 0.9 Mpa, etc.

[0053] A diameter d3 of the second opening area 1112 is 0.8 cm < d3 < 1 cm, for example, d3 is 0.81 cm, 0.83 cm, 0.85 cm, 0.86 cm, 0.88 cm, 0.90 cm, 0.92 cm, 0.95 cm, or 0.99 cm, etc.; the anti-explosion pressure of the second opening area 1112 is 1 Mpa-1.2 Mpa, for example, the anti-explosion pressure is 1 Mpa, 1.12 Mpa, 1.14 Mpa, 1.15 Mpa, 1.16 Mpa, 1.18 Mpa, 1.19 Mpa, 1.2 Mpa, etc.

[0054] It should be noted that the diameter of the second opening area 1112 described above can also be the inner diameter of the corresponding second anti-explosion notch 1114. Alternatively, the width of the second anti-explosion notch 1114 is about 0.3 mm.

[0055] In this embodiment, by limiting the diameter range of the three second opening areas 1112 to be different, the anti-explosion pressure of the corresponding second opening area 1112 can also be controlled to be different, and then the opening sequence can be controlled to be different. For example, the second opening area 1112 corresponding to the diameter d1 is defined as a first-level anti-explosion pressure area, the second opening area 1112 corresponding to the diameter d2 is defined as a second-level anti-explosion pressure area, the second opening area 1112 corresponding to the diameter d3 is defined as a third-level anti-explosion pressure area, and the first opening area 1111 is defined as a comprehensive anti-explosion pressure area. When the initial pressure relief, the low opening pressure area is preferentially opened, that is, the first-level anti-explosion pressure area can be preferentially opened. When the battery cell 3 gradually loses control, the second-level anti-explosion pressure area and the third-level anti-explosion pressure area can be sequentially opened. When the battery cell 3 completely loses control, the comprehensive anti-explosion pressure area is opened, so that the inside of the battery 1000 is rapidly relieved. The multi-level opening mode can reduce the ejection of high-temperature substances and reduce the probability of fire, and can also avoid the explosion caused by the increase of pressure.

[0056] According to one embodiment of the present application, the second opening area 1112 with diameter d2 is located at the center of the rupture disc 111 in the direction of the long axis of the rupture disc 111, the second opening area 1112 with diameter d1 is located at one side of the second opening area 1112 with diameter d2 in the direction of the long axis, and the second opening area 1112 with diameter d3 is located at the other side of the second opening area 1112 with diameter d2 in the direction of the long axis. For example, the direction of the long axis of the rupture disc 111 is the up-down direction, and the second opening area 1112 with diameter d1, the second opening area 1112 with diameter d2, and the second opening area 1112 with diameter d3 are sequentially arranged from top to bottom, so that the opening can be gradually performed from one end close to the long axis to the other end of the long axis in the direction of the long axis. It should be noted that, in the present embodiment, when the second opening area 1112 with diameter d1 is opened, the temperature of the periphery of the second opening area 1112 with diameter d1 is the highest due to the influence of the jet velocity, and the pressure of the rupture disc around the second opening area 1112 with diameter d1 is affected, so that the pressure of the rupture disc is gradually increased along the direction of the long axis in order to minimize the influence.

[0057] In some embodiments of the present application, the opening pressure corresponding to each second opening area 1112 is P, the diameter corresponding to each second opening area 1112 is d, the thickness corresponding to each second opening area 1112 is H, and the depth of the second rupture score 1114 corresponding to each second opening area 1112 is h, which satisfy the following relationship:

[0058] P=a x ;

[0059] wherein P is 0.5 MPa to 1.5 MPa; a is a correction coefficient corresponding to the opening of the second opening area 1112, that is, the correction coefficient applicable to the pressure of the rupture disc of 0.5 MPa to 1.5 MPa; and H is less than the thickness of the battery cover plate 1. In order to facilitate description, a can be divided into a1, a2 and a3, a1 is a correction coefficient corresponding to the opening of the second opening area 1112 with diameter d1, a2 is a correction coefficient corresponding to the opening of the second opening area 1112 with diameter d2, and a3 is a correction coefficient corresponding to the opening of the second opening area 1112 with diameter d3.

[0060] In some embodiments of the present application, the outer edges of the first rupture score 1113 and the second rupture score 1114 are spaced apart, so as to avoid that the opening of the first opening area 1111 causes the second opening area 1112 to be affected; and / or at least one of the first rupture score 1113 and the second rupture score 1114 is in the shape of a closed or semi-closed ring, so that the degree of rupture can be controlled by controlling the shape.

[0061] According to one embodiment of the present application, the number of the second opening areas 1112 is multiple, the depths of the second explosion-proof notches 1114 corresponding to two adjacent second opening areas 1112 are the same or different, and more levels of explosion-proof can be achieved.

[0062] The present application also provides a battery cover plate 1, comprising a cover plate body 12 and an explosion-proof valve 11, the cover plate body 12 is provided with a mounting hole, and the explosion-proof valve 11 is arranged in the mounting hole. The explosion-proof valve 11 is any one of the above-mentioned embodiments. Since the above-mentioned explosion-proof valve 11 has the advantages of high safety, the battery cover plate 1 of the embodiment of the present application also has the same advantages, which will not be repeated here.

[0063] The present application also provides a battery 1000, comprising a shell 2, a battery cell 3 and a battery cover plate 1. The shell 2 has a receiving space, and is provided with an open end communicating with the receiving space. The battery cell 3 is arranged in the receiving space, and the battery cover plate 1 is arranged at the open end. The battery cover plate 1 is any one of the above-mentioned embodiments. Since the battery cover plate 1 of the embodiment of the present application has the advantage of not being prone to thermal runaway, and the battery 1000 of the embodiment of the present application comprises the battery cover plate 1 of any one of the above-mentioned embodiments, the battery 1000 of the embodiment of the present application has the advantages of high safety, not being prone to thermal runaway, etc., which will not be repeated here.

[0064] Optionally, the battery cover plate 1 can be welded with the shell 2, for example, the cover plate body 12 is an aluminum plate, the shell 2 is an aluminum shell, and the aluminum plate is laser welded with the aluminum shell. Optionally, the explosion-proof valve 11 is laser welded with the cover plate body 12, and the connection is firm. Optionally, the positive pole 44 and the negative pole 47 of the battery 1000 are assembled by injection molding connection, for example, the poles penetrate through the through holes on the cover plate body 12, are clamped on the cover plate body 12 through the upper insulating rubber pad 49 and the lower sealing ring 43, and the lower plastic 48 can be clamped between the poles and the aluminum plate. Optionally, the cover plate is also provided with a liquid injection hole, which is convenient for injecting electrolyte. Optionally, the liquid injection hole is designed with a sealing rubber nail 41, which can seal the liquid injection hole, and an aluminum nail 42 (laser welded) is also welded. In addition, the lower plastic 48 under the liquid injection hole has a blocking effect, which can prevent the sealing rubber nail 41 or other substances from falling into the battery cell 3. Optionally, the sealing hole is sealed by the sealing rubber nail 41 first, then the liquid injection hole is sealed by the sealing rubber nail 41, and the sealing rubber nail 41 is laser welded on the cover plate body 12, and the aluminum nail 42 in the shape of a flat plate is welded on the top.

[0065] The battery 1000 of the embodiment of the present application will be described in detail below in combination with specific embodiments.

[0066] The battery 1000 of the embodiment is a secondary battery 1000, and comprises a shell 2, a top cover, an electric core 3, and an insulating patch. The top cover is the cover plate body 12 of any one of the above embodiments. The shell 2 is a semi-closed aluminum shell, and the top cover is designed on the top of the aluminum shell. The aluminum shell has an accommodating cavity inside, and the electric core 3 is designed in the accommodating cavity of the aluminum shell. The top cover is designed with a positive pole 44, a negative pole 47, an explosion-proof valve 11, and a liquid injection port. The electric core 3 is formed by winding or stacking a positive pole sheet, a diaphragm, a negative pole sheet, a Mylar film, and a bottom gasket. The electric core 3 is designed with positive and negative pole lugs at the upper portion. The positive pole lug is connected with the positive pole terminal on the top cover, and the negative pole lug is connected with the negative pole terminal on the top cover. The connection can be made through a connecting sheet or directly. For example, the positive pole lug is connected with the negative connecting sheet 45 welded on the top cover, and the negative pole lug is connected with the positive connecting sheet 46 welded on the top cover.

[0067] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can 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 (11), characterized in that: Comprising: An explosion-proof sheet (111), the explosion-proof sheet (111) having a first opening area (1111) and a second opening area (1112), the area of the first opening area (1111) being larger than the area of the second opening area (1112), and the orthographic projection of the second opening area (1112) on the explosion-proof sheet (111) being located inside the orthographic projection of the first opening area (1111) on the explosion-proof sheet (111); Wherein, at least a part of the outer periphery of the first opening area (1111) is provided with a first explosion-proof notch (1113), at least a part of the outer periphery of the second opening area (1112) is provided with a second explosion-proof notch (1114), the opening pressure of the first explosion-proof notch (1113) is greater than the opening pressure of the second explosion-proof notch (1114), and the explosion-proof pressure of the first opening area (1111) is greater than the explosion-proof pressure of the second opening area (1112).

2. The explosion-proof valve according to claim 1, characterized in that: The depth of the first explosion-proof notch (1113) is different from the depth of the second explosion-proof notch (1114).

3. The explosion-proof valve (11) according to claim 1, characterized in that The shape of the first opening area (1111) is an oval, and / or the shape of the second opening area (1112) is a perfect circle.

4. The explosion-proof valve according to claim 3, characterized in that: The shape of the first opening area (1111) is an oval, the shape of the second opening area (1112) is a perfect circle, the number of the second opening areas (1112) is multiple, and the multiple second opening areas (1112) are spaced apart along the long axis direction of the first opening area (1111).

5. The explosion-proof valve according to claim 4, characterized in that: The shapes of the first explosion-proof notch (1113) and the second explosion-proof notch (1114) are both annular, the explosion-proof pressure of the first opening area (1111) is 1.5 MPa, the number of the second opening areas (1112) is three, the diameter d1 of one second opening area (1112) is 0.4 cm < d1 < 0.6 cm, and the explosion-proof pressure is 0.5 Mpa - 0.7 Mpa; the diameter d2 of another second opening area (1112) is 0.6 cm < d2 < 0.8 cm, and the explosion-proof pressure is 0.7 Mpa - 0.9 Mpa; the diameter d3 of yet another second opening area (1112) is 0.8 cm < d3 < 1 cm, and the explosion-proof pressure is 1 Mpa - 1.2 Mpa.

6. The explosion-proof valve according to claim 5, characterized in that: The second opening area (1112) with diameter d2 is located at the central position of the explosion-proof sheet (111) in its own long axis direction, the second opening area (1112) with diameter d1 is located on one side of the second opening area (1112) with diameter d2 in the long axis direction, and the second opening area (1112) with diameter d3 is located on the other side of the second opening area (1112) with diameter d2 in the long axis direction.

7. The explosion-proof valve (11) according to claim 5, characterized in that The opening pressure corresponding to each second opening area (1112) is P, the diameter corresponding to each second opening area (1112) is d, the thickness corresponding to each second opening area (1112) is H, and the depth of the second explosion-proof notch (1114) corresponding to each second opening area (1112) is h, satisfying the following relationship: P=a x ; Wherein, P is 0.5MPa to 1.5MPa; a is the correction coefficient corresponding to opening the second opening area (1112).

8. The explosion-proof valve according to claim 1, characterized in that: The outer edge of the first explosion-proof notch (1113) is spaced apart from the outer edge of the second explosion-proof notch (1114); and / or at least one of the first explosion-proof notch (1113) and the second explosion-proof notch (1114) is in the shape of a closed or semi-closed ring.

9. A battery cover (1), characterized in that: include: A cover plate body (12), wherein the cover plate body (12) has a mounting hole; An explosion-proof valve (11), the explosion-proof valve (11) is arranged in the mounting hole, and the explosion-proof valve (11) is the explosion-proof valve according to any one of claims 1 to 8.

10. A battery (1000), characterized in that include: A shell (2), the shell (2) having a receiving space, and the shell (2) being provided with an open end communicating with the receiving space; A battery cell (3), the battery cell (3) being installed in the receiving space; A battery cover (1), the battery cover (1) being arranged at the open end, the battery cover (1) being the battery cover (1) according to claim 9.

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