Anti-explosion piece, anti-explosion structure, cover plate assembly, battery and electric equipment

Abstract

An explosion-proof sheet, an explosion-proof structure, a cover plate assembly, a battery and an electric equipment, the explosion-proof sheet comprises a main body and a cover body, the main body comprises a first surface and a second surface opposite to each other in the thickness direction, the second surface is suitable for being configured to face a battery cell, and the main body is provided with an exhaust hole penetrating through the first surface and the second surface; the cover body is arranged on the first surface and seals the exhaust hole, the cover body is an elastic component, the peripheral edge of the cover body is in complete contact with the first surface, and the cover body is suitable for elastic deformation so that a gap can be formed between at least part of the peripheral edge of the cover body and the first surface. The peripheral edge of the cover body is in complete contact with the first surface and seals the exhaust hole, and the cover body is suitable for elastic deformation to enable at least part of the peripheral edge of the cover body to generate a gap with the first surface, so that air pressure in the battery can be released to the outside through the gap when the air pressure is small, and the cover body can seal the exhaust hole again after exhaust is finished; the service life of the explosion-proof sheet is prolonged, and the performance stability of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an explosion-proof sheet, an explosion-proof structure, a cover plate assembly, a battery and electrical equipment. Background Art

[0002] The battery explosion-proof valve is a safety device that protects the battery in an emergency. Its main function is to automatically open the valve when the temperature or pressure inside the battery is too high, and directly dissipate the internal high-pressure gas into the external environment, thereby achieving the purpose of explosion prevention. This function is achieved by controlling the pressure and temperature inside the battery, thereby preventing the battery from exploding due to overcharging or over-discharging.

[0003] In the prior art, the high pressure in the battery is usually released by cracking and exhausting the explosion-proof plate. However, when the internal gas pressure of the battery is low, the gas cannot be exhausted, which affects the battery performance. Utility Model Content

[0004] The purpose of the utility model is to provide an explosion-proof plate, an explosion-proof structure, a cover plate assembly, a battery and an electrical device, so as to solve the problem that in the prior art, the high pressure in the battery is usually released by cracking and venting the explosion-proof plate, but the gas cannot be vented when the gas pressure inside the battery is low, thus affecting the battery performance.

[0005] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides an explosion-proof sheet, comprising: a main body, comprising a first surface and a second surface opposite to each other in a thickness direction, the second surface being suitable for being configured to face a battery cell, the main body being provided with an exhaust hole penetrating the first surface and the second surface; a cover body, arranged on the first surface and closing the exhaust hole, the cover body being an elastic component, the four peripheral edges of the cover body being in complete contact with the first surface, and the cover body being suitable for elastic deformation so that at least part of the four peripheral edges of the cover body form a gap with the first surface.

[0007] In one embodiment, the cover body includes a first edge and a second edge opposite to each other in a first direction, the first edge is connected and fixed to the first surface, and at least a portion of the second edge is bonded to the first surface.

[0008] In one embodiment, the cover body also includes a third edge and a fourth edge relative to each other in the second direction, the third edge connects the first edge and the second edge, and the fourth edge connects the first edge and the second edge; at least a portion of the third edge is connected and fixed to the first surface, and / or at least a portion of the fourth edge is connected and fixed to the first surface; the first direction and the second direction intersect.

[0009] In one embodiment, the cover body includes a first plate and a second plate, the first plate is connected to the second plate, the first plate includes the first edge, the third edge and the fourth edge, the second plate includes the second edge, the first plate, the second plate and the main body form an air storage cavity, and the air storage cavity is connected to the exhaust hole.

[0010] In one embodiment, the cover body also includes a fifth edge, which is connected to the second edge, the third edge and the fourth edge, and the size of the first plate in the third direction gradually decreases from the fifth edge to the first edge, and the size of the second plate in the third direction gradually decreases from the fifth edge to the second edge, and the third direction intersects with the first direction and the second direction.

[0011] In one implementation, the maximum spacing distance between the first edge and the fifth edge in the first direction is A, and the maximum spacing distance between the second edge and the fifth edge in the first direction is B, satisfying: 2≤A / B≤4.

[0012] In one embodiment, the exhaust hole is rotationally symmetrical about a first axis, the first axis extends along the third direction, and the cross-sectional shape of the exhaust hole at any position perpendicular to the first axis is circular, and the center of gravity of the cover body is spaced apart from the first axis.

[0013] In one embodiment, the maximum spacing distance between the fifth edge and the first surface in the third direction is C, the minimum inner diameter of the exhaust hole is D, the maximum spacing distance between the first edge and the second edge in the first direction is E, and the maximum spacing distance between the third edge and the fourth edge in the second direction is F, satisfying: 1 / 10≤C / D≤1 / 2, and / or, satisfying: 11 / 10≤E / D≤3 / 2, and / or, satisfying: 11 / 10≤F / D≤3 / 2.

[0014] In one embodiment, the inner diameter of the exhaust hole gradually decreases from the second surface to the first surface.

[0015] In one embodiment, the main body is rotationally symmetric around the first axis, and the cross-sectional shape of the main body at any position perpendicular to the first axis is circular. In the orthographic projection in the third direction, the diameter of the main body is G, satisfying: 1 / 10≤D / G≤1 / 5.

[0016] In one embodiment, the main body includes a main body portion and a connecting portion, the connecting portion is arranged around the outer periphery of the main body portion, the main body portion includes the first surface and the second surface, the exhaust hole is opened in the main body portion, and the outer peripheral edge of the second surface is provided with a notch.

[0017] In one embodiment, a size of the main body in the third direction gradually decreases from the connecting portion toward the exhaust hole.

[0018] In one embodiment, the first surface is an outwardly convex arc surface, the second surface is an inwardly concave arc surface, the main body encloses a cavity, and the cavity is connected to the exhaust hole.

[0019] In a second aspect, the utility model further provides an explosion-proof structure, comprising a waterproof breathable membrane and the explosion-proof plate described in each embodiment of the first aspect, wherein the waterproof breathable membrane is arranged on a side of a second surface of the explosion-proof plate away from the first surface.

[0020] In one embodiment, the explosion-proof structure also includes a protective cover, which has a receiving space. The protective cover is provided with an air outlet, which is connected to the receiving space. The protective cover is connected to a side of the explosion-proof plate away from the waterproof breathable membrane, and the cover body of the explosion-proof plate is received in the receiving space.

[0021] In the third aspect, the utility model also provides a cover plate assembly, comprising a cover plate and the explosion-proof structure described in each embodiment of the second aspect, the cover plate being provided with an air vent, the explosion-proof structure being connected to the cover plate, the explosion-proof structure being suitable for being configured to face away from the battery cell, and the air vent being suitable for connecting the battery cell and the explosion-proof structure.

[0022] In a fourth aspect, the utility model further provides a battery, comprising a shell, a battery cell and the cover assembly described in each embodiment of the third aspect, the shell having a accommodating cavity, the battery cell being accommodated in the accommodating cavity, the cover assembly being connected to the shell and closing the accommodating cavity, and the air vent of the cover assembly being connected to the accommodating cavity.

[0023] In a fifth aspect, the utility model further provides an electrical equipment, comprising an electrical device and the battery described in each embodiment of the fourth aspect, wherein the battery is suitable for supplying power to the electrical device.

[0024] By setting a cover body, the cover body is an elastic component, the four edges of the cover body are completely in contact with the first surface and close the exhaust hole, and the cover body is suitable for elastic deformation to form a gap between at least part of the four edges of the cover body and the first surface, so that when the internal air pressure of the battery is relatively low, it can be released to the outside through the gap, and the cover body can re-close the exhaust hole after the exhaust is completed, thereby extending the service life of the explosion-proof plate and improving the performance stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a structural diagram of an explosion-proof disk of an embodiment;

[0027] Figure 2 is a cross-sectional view of a bursting disk of an embodiment;

[0028] Figure 3 is a top view of a bursting disk of an embodiment;

[0029] Figure 4 It is a structural diagram of an explosion-proof structure of an embodiment.

[0030] Description of reference numerals:

[0031] 1000-explosion-proof structure;

[0032] 100-explosion-proof disk;

[0033] 10-main body, 11-first surface, 12-second surface, 13-exhaust hole, 14-main body, 15-connecting part, 16-notch, 17-cavity;

[0034] 20 - cover body, 21 - first edge, 22 - second edge, 23 - third edge, 24 - fourth edge, 25 - first plate, 26 - second plate, 27 - fifth edge;

[0035] 30-air storage chamber;

[0036] 40- first axis;

[0037] 200- waterproof breathable membrane;

[0038] 300-protection cover, 301-accommodation space, 302-air outlet;

[0039] X-first direction, Y-second direction, Z-third direction. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0042] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0043] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] Please refer to Figures 1 to 3 The utility model provides an explosion-proof disk 100, comprising a main body 10 and a cover body 20. The main body 10 comprises a first surface 11 and a second surface 12 opposite to each other in the thickness direction, the second surface 12 is adapted to be configured to face a battery cell (not shown), the main body 10 is provided with an exhaust hole 13 penetrating the first surface 11 and the second surface 12, the cover body 20 is arranged on the first surface 11 and closes the exhaust hole 13, the cover body 20 is an elastic member, the four peripheral edges of the cover body 20 are in full contact with the first surface 11, and the cover body 20 is adapted to be elastically deformed so that at least part of the four peripheral edges of the cover body 20 and the first surface 11 form a gap.

[0045] Optional, please refer to Figure 1The explosion-proof plate 100 provided by the utility model is used for a battery (not shown). When the battery cell is cycled under high cut-off voltage or high rate conditions, the electrolyte (not shown) in the battery shell (not shown) will undergo side reactions such as exothermic decomposition reaction, and produce a large amount of ethylene, hydrogen, carbon dioxide and other gases, so that the gas pressure and temperature in the shell increase. As the cycle proceeds, the gas production in the battery cell increases, and the hot gas rises and gathers at the exhaust hole 13 of the main body 10, so that the gas pressure at the exhaust hole 13 is higher than the gas pressure in the battery cell. When the gas pressure rises to a preset value, the unfixed edge of the cover body 20 is elastically deformed and a gap is formed between the cover body 20 and the first surface 11 to discharge excess gas. Optionally, the cover body 20 can also be flexibly deformed so that at least part of the four peripheral edges of the cover body 20 and the first surface 11 form a gap.

[0046] Optional, please refer to Figure 2 The main body 10 is provided with a notch 16. When the battery cell fails due to abnormal use conditions such as overcharging or over-discharging, a large amount of gas is generated instantly. When the gas pressure in the battery cell suddenly rises to the safe pressure threshold of the battery cell, the gap between the cover body 20 and the first surface 11 can no longer meet the exhaust demand, and the notch 16 of the main body 10 bursts to release the pressure.

[0047] Optionally, the main body 10 and the cover body 20 can be partially fixed by means of snap connection, welding, screw connection, hinge, riveting and bonding, etc., without limitation. Optionally, the portion of the cover body 20 used to form a gap with the first surface 11 can be connected by reusable glue, so that the four edges of the cover body 20 can be tightly attached to the first surface 11 in the normal state of the battery to isolate the exhaust hole 13, which can be polyethyleneimine and EVA hot melt adhesive (ethylene-vinyl acetate copolymer hot melt adhesive) and the like, without limitation. Optionally, the portion of the cover body 20 used to form a gap with the first surface 11 can also be connected by a magnetic attraction structure that can be repeatedly attached and detached, without limitation.

[0048] Optional, please refer to Figure 3 In the orthographic projection of the third direction Z, the contour shape of the main body 10 can be circular, rectangular, elliptical, triangular, etc., without limitation. The third direction Z corresponds to the thickness direction of the main body 10. Optionally, in the orthographic projection of the third direction Z, the contour shape of the cover body 20 can be circular, rectangular, elliptical, triangular, irregular polygonal, etc., without limitation. Optionally, in the orthographic projection of the third direction Z, the contour shape of the exhaust hole 13 can be circular, rectangular, elliptical, triangular, etc., without limitation.

[0049] Optionally, the main body 10 can be made of a material that meets the requirements of structural strength, high temperature resistance, and easy processing and molding, and can specifically be aluminum, nickel, copper, iron, polypropylene, polycarbonate, and polytetrachloroethylene, etc., without limitation. Optionally, the cover body 20 can be made of a material that meets the requirements of structural strength, high temperature resistance, and soft texture and easy deformation, and can specifically be polyethylene terephthalate, polybutylene terephthalate, borosilicate rubber, perfluoroether rubber, EPDM rubber, foamed nickel, foamed copper, foamed aluminum, and foamed stainless steel, etc., without limitation.

[0050] By setting the cover body 20, the cover body 20 is an elastic component, the four edges of the cover body 20 are completely in contact with the first surface 11 and close the exhaust hole 13, and the cover body 20 is suitable for elastic deformation to form a gap between at least part of the four edges of the cover body 20 and the first surface 11. Compared with the solution that the explosion-proof plate 100 bursts to discharge the air pressure when the battery cell pressure is too high, this solution sets the cover body 20 so that the internal air pressure of the battery can be released to the outside through the gap when it is relatively low. After the exhaust is completed, the cover body 20 can re-close the exhaust hole 13, thereby extending the service life of the explosion-proof plate 100 and improving the performance stability of the battery.

[0051] Please refer to Figure 3 The cover body 20 includes a first edge 21 and a second edge 22 that are opposite to each other in the first direction X, the first edge 21 is connected and fixed to the first surface 11, and at least a portion of the second edge 22 is bonded to the first surface 11. Optionally, the first edge 21 may extend along a straight line or may extend in a curved manner without limitation. Optionally, the second edge 22 may extend along a straight line or may extend in a curved manner without limitation.

[0052] Optionally, the second edge 22 may be entirely bonded to the first surface 11, or the second edge 22 may be partially bonded to the first surface 11, without limitation. Optionally, when the second edge 22 is partially bonded to the first surface 11, there may be multiple bonding locations between the second edge 22 and the first surface 11, and the multiple bonding locations are spaced apart on the second edge 22. Optionally, multiple bonding locations may be provided at both ends of the second edge 22 in the second direction Y, and / or, multiple bonding locations may be provided at the middle of the second edge 22 in the second direction Y, without limitation, and the second direction Y intersects the first direction X. Optionally, the second edge 22 and the first surface 11 may be point-connected or linearly connected, without limitation.

[0053] Optionally, the first edge 21 can be connected and fixed to the first surface 11 by means of clamping, welding, screwing, hinges, riveting and bonding, without limitation. Optionally, the second edge 22 can be at least partially bonded to the first surface 11 by reusable glue (not shown), specifically polyethyleneimine and EVA hot melt adhesive (ethylene-vinyl acetate copolymer hot melt adhesive), etc., without limitation. Optionally, the cover body 20 can also be at least partially magnetically connected to the first surface 11 by a magnetic attraction structure (not shown) that can be repeatedly attached and detached, without limitation. Optionally, the first direction X corresponds to the length direction of the cover body 20, and the first direction X intersects with the aforementioned third direction Z.

[0054] By setting the cover body 20 to include a first edge 21 and a second edge 22 that are opposite to each other in the first direction X, the first edge 21 is connected and fixed to the first surface 11, and at least a portion of the second edge 22 is bonded to the first surface 11, so that the cover body 20 can be connected and fixed to the first surface 11 through the first edge 21, and can undergo elastic deformation at the first edge 21, thereby ensuring the stability of the cover body 20 during elastic deformation. At the same time, at least a portion of the second edge 22 is bonded to the first surface 11, so that when the battery cell is in a normal state, the cover body 20 is not likely to generate a gap with the first surface 11 due to the influence of the external environment, thereby ensuring the airtightness of the exhaust hole 13 and preventing dust and moisture from entering the exhaust hole 13.

[0055] Please refer to Figure 3 The cover body 20 also includes a third edge 23 and a fourth edge 24 opposite to each other in the second direction Y, the third edge 23 connects the first edge 21 and the second edge 22, the fourth edge 24 connects the first edge 21 and the second edge 22, at least a portion of the third edge 23 is connected and fixed to the first surface 11, and / or, at least a portion of the fourth edge 24 is connected and fixed to the first surface 11, and the first direction X and the second direction Y intersect.

[0056] Optionally, the third edge 23 may extend in a straight line or in a curved manner without limitation. Optionally, the fourth edge 24 may extend in a straight line or in a curved manner without limitation. Optionally, the third edge 23 and the fourth edge 24 may be arranged opposite to each other in the second direction Y or may be arranged obliquely without limitation. Exemplarily, the length dimension of the first edge 21 in the second direction Y is smaller than the length dimension of the second edge 22 in the second direction Y, and the third edge 23 and the fourth edge 24 are arranged obliquely.

[0057] Optionally, one end of the third edge 23 close to the first edge 21 is connected and fixed to the first surface 11. Optionally, one end of the fourth edge 24 close to the first edge 21 is connected and fixed to the first surface 11. Optionally, the portion of the third edge 23 not connected and fixed to the first surface 11 may be bonded to the first surface 11. Optionally, the portion of the fourth edge 24 not connected and fixed to the first surface 11 may be bonded to the first surface 11.

[0058] Optionally, the connection method between the third edge 23 and the first surface 11 is similar to the connection method between the first edge 21 and the first surface 11, which can be used as a reference and will not be repeated. Optionally, the connection method between the fourth edge 24 and the first surface 11 is similar to the connection method between the first edge 21 and the first surface 11, which can be used as a reference and will not be repeated. Optionally, the second direction Y corresponds to the width direction of the cover body 20, and the second direction Y also intersects with the third direction Z.

[0059] By arranging the third edge 23 and the fourth edge 24 opposite to each other in the second direction Y, the third edge 23 connects the first edge 21 and the second edge 22, the fourth edge 24 connects the first edge 21 and the second edge 22, at least a portion of the third edge 23 is connected and fixed to the first surface 11, and / or at least a portion of the fourth edge 24 is connected and fixed to the first surface 11, the first direction X and the second direction Y intersect, so that the connection between the cover body 20 and the main body 10 is more stable, and it is not easy to fall off from the main body 10 when the pressure is released, and it is not easy to separate from the main body 10 under the influence of the external environment, thereby ensuring the stability of the explosion-proof disk 100.

[0060] Please refer to Figure 1 and Figure 2 The cover body 20 includes a first plate 25 and a second plate 26, the first plate 25 is connected to the second plate 26, the first plate 25 includes a first edge 21, a third edge 23 and a fourth edge 24, the second plate 26 includes a second edge 22, the first plate 25, the second plate 26 and the main body 10 are surrounded to form an air storage cavity 30, and the air storage cavity 30 is connected to the exhaust hole 13.

[0061] Optional, please refer to Figure 1 The first plate 25 and the second plate 26 are both curved plates that protrude in the direction away from the first surface 11, so that the cover body 20 is more easily subjected to force when the gas pressure rises. Optionally, the cover body 20 can also be a prism, a cuboid, a cube, a cylinder, etc., without limitation, that is, the cover body 20 is composed of multiple plate components to meet actual needs. Optionally, the first plate 25 and the second plate 26 are an integrated structure, and can also be detachably connected by screwing, riveting, clamping, bonding, etc., without limitation.

[0062] The cover body 20 includes a first plate 25 and a second plate 26, the first plate 25 is connected to the second plate 26, the first plate 25 includes a first edge 21, a third edge 23 and a fourth edge 24, the second plate 26 includes a second edge 22, the first plate 25, the second plate 26 and the main body 10 are surrounded to form a gas storage cavity 30, and the gas storage cavity 30 is connected to the exhaust hole 13, so that the gas generated by the battery cell can be gathered into the gas outlet cavity through the exhaust hole 13, so that the gas pressure in the gas outlet cavity is greater than the gas pressure at the battery cell, which is conducive to the elastic deformation of the cover body 20 and the formation of a gap between the first surface 11.

[0063] Please refer to Figure 2 The cover body 20 also includes a fifth edge 27, which is connected to the second edge 22, the third edge 23 and the fourth edge 24. From the fifth edge 27 to the first edge 21, the size of the first plate 25 in the third direction Z gradually decreases. From the fifth edge 27 to the second edge 22, the size of the second plate 26 in the third direction Z gradually decreases. The third direction Z intersects with the first direction X and the second direction Y.

[0064] Optionally, the size of the first plate 25 in the third direction Z is 0.05 mm (millimeter)-0.3 mm, specifically 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm and 3 mm, etc., without limitation. Optionally, the size of the second plate 26 in the third direction Z is similar to the thickness of the first plate 25, which can be used as a reference and will not be described in detail.

[0065] By setting the fifth edge 27, the fifth edge 27 is connected to the second edge 22, the third edge 23 and the fourth edge 24. From the fifth edge 27 to the first edge 21, the size of the first plate 25 in the third direction Z gradually decreases, and from the fifth edge 27 to the second edge 22, the size of the second plate 26 in the third direction Z gradually decreases. The third direction Z and the first direction X and the second direction Y all intersect, so that the center of gravity of the cover body 20 is closer to the side of the second plate 26, and the second edge 22 is in close contact with the first surface 11, and is not easily separated from the first surface 11 due to vibration and impact.

[0066] Please refer to Figure 3 , the maximum spacing distance between the first edge 21 and the fifth edge 27 in the first direction X is A, the maximum spacing distance between the second edge 22 and the fifth edge 27 in the first direction X is B, and the following conditions are satisfied: 2≤A / B≤4.

[0067] Optionally, A / B can be 2, 3, 4, etc., without limitation. Optionally, when A / B>4, the center of gravity of the cover body 20 is too close to the second edge 22, resulting in the cover body 20 requiring a larger air pressure to elastically deform and a gap between the cover body 20 and the first surface 11, which is not conducive to timely release of gas in the battery cell. Optionally, when A / B<2, the center of gravity of the cover body 20 is too close to the first edge 21, resulting in less gravity on the second edge 22, and the risk of the second edge 22 and the first surface 11 not fitting tightly.

[0068] By setting the maximum spacing distance between the first edge 21 and the fifth edge 27 in the first direction X to A, and the maximum spacing distance between the second edge 22 and the fifth edge 27 in the first direction X to B, and satisfying: 2≤A / B≤4, the center of gravity of the cover body 20 is closer to the second plate 26, and the second edge 22 is in close contact with the first surface 11, and is not easily separated from the first surface 11 due to vibration and impact.

[0069] Please refer to Figure 2 The exhaust hole 13 is rotationally symmetrical about the first axis 40, the first axis 40 extends along the third direction Z, and the cross-sectional shape of the exhaust hole 13 at any position perpendicular to the first axis 40 is circular, and the center of gravity of the cover body 20 is spaced apart from the first axis 40. Optionally, the center of gravity of the cover body 20 is located on a side of the first axis 40 close to the second plate 26.

[0070] By setting the exhaust hole 13 rotationally symmetrical around the first axis 40, the first axis 40 extends along the third direction Z, and the cross-sectional shape of the exhaust hole 13 at any position perpendicular to the first axis 40 is circular, the center of gravity of the cover body 20 is spaced apart from the first axis 40, so that the center of gravity of the cover body 20 is closer to the second plate 26, and the second edge 22 is in close contact with the first surface 11, and is not easily separated from the first surface 11 due to vibration and impact, and at the same time, the gas encounters less resistance when passing through the exhaust hole 13.

[0071] Please refer to Figure 2 and Figure 3 , the maximum spacing distance between the fifth edge 27 and the first surface 11 in the third direction Z is C, the minimum inner diameter of the exhaust hole 13 is D, the maximum spacing distance between the first edge 21 and the second edge 22 in the first direction X is E, and the maximum spacing distance between the third edge 23 and the fourth edge 24 in the second direction Y is F, satisfying: 1 / 10≤C / D≤1 / 2, and / or, satisfying: 11 / 10≤E / D≤3 / 2, and / or, satisfying: 11 / 10≤F / D≤3 / 2.

[0072] Optional, please refer to Figure 2 , C / D can be 1 / 10, 1 / 5, 3 / 10, 2 / 5 and 1 / 2, etc., without limitation. Optionally, when C / D>1 / 2, the volume of the gas storage chamber 30 is too large, resulting in the battery cell needing to generate more gas to reach the gas pressure for elastic deformation of the cover body 20. Optionally, when C / D<1 / 10, the center of gravity of the cover body 20 is low, which is not conducive to the four peripheral edges of the cover body 20 abutting against the first surface 11.

[0073] Optional, please refer to Figure 3, E / D can be specifically 11 / 10, 6 / 5, 13 / 10, 7 / 5 and 3 / 2, etc., without limitation. Optionally, when E / D>3 / 2, the size of the cover body 20 is too large, and it is easy to bend or deform under the action of stress, which is not conducive to the four edges of the cover body 20 abutting against the first surface 11. Optionally, when E / D<11 / 10, there is a risk that the cover body 20 cannot completely isolate the exhaust hole 13.

[0074] Optional, please refer to Figure 3 , F / D can be specifically 11 / 10, 6 / 5, 13 / 10, 7 / 5 and 3 / 2, etc., without limitation. Optionally, when F / D>3 / 2, the size of the cover body 20 is too large, and it is easy to bend or deform under the action of stress, which is not conducive to the four edges of the cover body 20 abutting against the first surface 11. Optionally, when F / D<11 / 10, there is a risk that the cover body 20 cannot completely isolate the exhaust hole 13.

[0075] By setting the maximum spacing distance between the fifth edge 27 and the first surface 11 in the third direction Z to C, the minimum inner diameter of the exhaust hole 13 to D, the maximum spacing distance between the first edge 21 and the second edge 22 in the first direction X to E, and the maximum spacing distance between the third edge 23 and the fourth edge 24 in the second direction Y to F, the following conditions are satisfied: 1 / 10≤C / D≤1 / 2, and / or: 11 / 10≤E / D≤3 / 2, and / or: 11 / 10≤F / D≤3 / 2, so that the edges of the cover body 20 can abut against the first surface 11, and elastic deformation is facilitated to form a gap between the cover body 20 and the first surface 11.

[0076] Please refer to Figure 2 The inner diameter of the exhaust hole 13 gradually decreases from the second surface 12 to the first surface 11. Optionally, the inner wall surface of the exhaust hole 13 can extend along a straight line or in a curved shape without limitation.

[0077] By setting the inner diameter of the exhaust hole 13 to gradually decrease from the second surface 12 to the first surface 11, the gas in the battery cell can more easily enter the gas storage cavity 30 through the exhaust hole 13, and is not easy to overflow from the gas storage cavity 30 to the exhaust hole 13, so that the air pressure in the gas storage cavity 30 is higher than the air pressure at the exhaust hole 13 and the battery cell.

[0078] Please refer to Figure 2 The main body 10 is rotationally symmetric around the first axis 40, and the cross-sectional shape of the main body 10 at any position perpendicular to the first axis 40 is circular. In the orthographic projection of the third direction Z, the diameter of the main body 10 is G, satisfying: 1 / 10≤D / G≤1 / 5.

[0079] Optionally, D / G can be 1 / 10, 3 / 20, 1 / 5, etc., without limitation. Optionally, when D / G>1 / 5, the diameter of the exhaust hole 13 is too large relative to the diameter of the main body 10, resulting in a decrease in the structural strength of the main body 10. Optionally, when D / G<1 / 10, the diameter of the exhaust hole 13 is too small, which is not conducive to the gas entering the gas storage chamber 30 through the exhaust hole 13.

[0080] By setting the main body 10 to be rotationally symmetric around the first axis 40, and the cross-sectional shape of the main body 10 at any position of the first axis 40 is circular, in the orthographic projection of the third direction Z, the diameter of the main body 10 is G, satisfying: 1 / 10≤D / G≤1 / 5, so that the air resistance of the exhaust hole 13 is small, and the main body 10 meets the structural strength requirements.

[0081] Please refer to Figure 2 The main body 10 includes a main body portion 14 and a connecting portion 15 , the connecting portion 15 is arranged around the outer periphery of the main body portion 14 , the main body portion 14 includes a first surface 11 and a second surface 12 , the exhaust hole 13 is opened in the main body portion 14 , and a notch 16 is opened on the outer peripheral edge of the second surface 12 .

[0082] Optionally, the main body 14 and the connecting portion 15 can be an integrated structure, or can be connected and fixed by welding, clamping, screwing and bonding, etc., without limitation. Optionally, the thickness of the main body 14 is 0.2mm-1mm, and can be 0.2mm, 0.4mm, 0.6mm, 0.8mm and 1mm, etc., without limitation. Optionally, the thickness of the connecting portion 15 is 0.3mm-2mm, and can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm and 2mm, etc., without limitation. Optionally, the thickness of the notch 16 is 0.05 mm-0.3 mm, specifically 0.05 mm, 0.1 mm, 1.5 mm, 2 mm, 2.5 mm and 3 mm, etc., without limitation.

[0083] The main body 10 includes a main body portion 14 and a connecting portion 15, the connecting portion 15 is arranged around the outer periphery of the main body portion 14, the main body portion 14 includes a first surface 11 and a second surface 12, the exhaust hole 13 is opened in the main body portion 14, and the outer peripheral edge of the second surface 12 is opened with a notch 16, so that the main body 10 can be connected to the cover of the battery through the connecting portion 15, and when the pressure of the battery cell is too large, the main body 10 can rupture at the notch 16 to quickly release the pressure to prevent the battery cell from burning or exploding.

[0084] Please refer to Figure 2, from the connecting portion 15 toward the exhaust hole 13 , the size of the main body 14 in the third direction Z gradually decreases.

[0085] By setting the direction from the connecting portion 15 to the exhaust hole 13, the size of the main body 14 in the third direction Z is gradually reduced, so that the thickness of the connection between the main body 14 and the connecting portion 15 is sufficient to open the notch 16, and at the same time, the explosion-proof plate 100 can be ruptured in a predetermined manner, thereby quickly releasing the internal pressure and avoiding the battery explosion.

[0086] Please refer to Figure 2 The first surface 11 is an outwardly convex arc surface, the second surface 12 is an inwardly concave arc surface, the main body 10 encloses a cavity 17, and the cavity 17 is connected to the exhaust hole 13. Optionally, the cavity 17 is suitable for being connected to the battery cell.

[0087] By setting the first surface 11 as a convex arc surface and the second surface 12 as a concave arc surface, the main body 10 encloses a cavity 17, and the cavity 17 is connected to the exhaust hole 13, so that the gas generated by the battery cell can be first stored in the cavity 17, and then flow to the exhaust hole 13 and enter the gas storage cavity 30 under the guidance of the second surface 12, thereby reducing the gas resistance during gas flow and accelerating the release of gas.

[0088] Please refer to Figure 4 The utility model further provides an explosion-proof structure 1000, comprising a waterproof breathable membrane 200 and an explosion-proof plate 100 in an embodiment of the utility model, wherein the waterproof breathable membrane 200 is disposed on a side of the second surface 12 of the explosion-proof plate 100 away from the first surface 11.

[0089] Optionally, the waterproof breathable membrane 200 is connected to the connection portion 15 of the main body 10 of the explosion-proof plate 100, and the waterproof breathable membrane 200 is used to allow the gas generated in the battery core to pass through and enter the aforementioned cavity 17, and to prevent the water vapor and dust in the cavity 17 from entering the battery core. Optionally, the waterproof breathable membrane 200 and the explosion-proof plate 100 can be connected and fixed by bonding, clamping, screwing, riveting and welding, etc., without limitation. Optionally, the waterproof breathable membrane 200 can be made of a waterproof, breathable, high temperature and corrosion resistant material, specifically polytetrafluoroethylene, polyurethane, polyurethane and polylactic acid, etc., without limitation.

[0090] The explosion-proof structure 1000 provided by the utility model adopts a waterproof breathable membrane 200 and an explosion-proof plate 100 in the embodiment of the utility model. The waterproof breathable membrane 200 is arranged on the second surface 12 of the explosion-proof plate 100 away from the first surface 11, thereby achieving the discharge of the relatively small air pressure inside the battery. After the exhaust is completed, it can be re-sealed, thereby extending the service life of the explosion-proof structure 1000. At the same time, the explosion-proof plate 100 can rupture when the air pressure is relatively high to quickly release the air pressure, thereby improving the performance stability of the battery and isolating the external water vapor and dust from entering the battery core.

[0091] Please refer to Figure 4 The explosion-proof structure 1000 also includes a protective cover 300, which has a receiving space 301. The protective cover 300 is provided with an air outlet 302, which is connected to the receiving space 301. The protective cover 300 is connected to a side of the explosion-proof plate 100 away from the waterproof breathable membrane 200, and the cover body 20 of the explosion-proof plate 100 is received in the receiving space 301.

[0092] Optionally, there may be a plurality of air outlets 302, and the plurality of air outlets 302 are arranged at intervals on the outer peripheral wall of the protective cover 300. Optionally, the protective cover 300 and the explosion-proof disk 100 may be connected and fixed by bonding, clamping, screwing, riveting and welding, etc., without limitation. Optionally, the protective cover 300 may be made of a material that meets the requirements of structural strength, high temperature resistance and corrosion resistance, and may be aluminum alloy, carbon fiber and plastic, etc., without limitation.

[0093] By setting a protective cover 300, the protective cover 300 has a receiving space 301, the protective cover 300 is provided with an air outlet 302, the air outlet 302 is connected to the receiving space 301, the protective cover 300 is connected to the side of the explosion-proof plate 100 away from the waterproof breathable membrane 200, and the cover body 20 of the explosion-proof plate 100 is received in the receiving space 301, so that the explosion-proof plate 100 is not easily affected by external collision or compression, thereby ensuring the safety of the explosion-proof plate 100.

[0094] Please refer to Figure 4 The utility model further provides a cover plate assembly (not shown), including a cover plate (not shown) and an explosion-proof structure 1000 as in the embodiment of the utility model, the cover plate is provided with an air vent (not shown), the explosion-proof structure 1000 is connected to the cover plate, the explosion-proof structure 1000 is suitable for being configured to face away from the battery cell, and the air vent is suitable for connecting the battery cell and the explosion-proof structure 1000.

[0095] Optionally, the explosion-proof structure 1000 and the cover plate can be connected and fixed by bonding, clamping, screwing, riveting and welding, etc., without limitation. Optionally, the explosion-proof structure 1000 can be partially extended into the air vent to improve the air tightness of the connection between the explosion-proof structure 1000 and the cover plate. Optionally, the cover plate can be made of a material that meets the requirements of structural strength, high temperature resistance and corrosion resistance, specifically aluminum alloy, stainless steel and carbon fiber, etc., without limitation.

[0096] The improved cover plate assembly of the present invention adopts a cover plate and an explosion-proof structure 1000 as in the embodiment of the present invention, the cover plate is provided with air holes, the explosion-proof structure 1000 is connected to the cover plate, the explosion-proof structure 1000 is suitable for being configured to face away from the battery cell, the air holes are suitable for connecting the battery cell and the explosion-proof structure 1000, thereby achieving connection and communication between the explosion-proof structure 1000 and the battery cell, and the explosion-proof structure 1000 can discharge the relatively small air pressure inside the battery, and can be re-sealed after the exhaust is completed, and at the same time, the explosion-proof sheet 100 of the explosion-proof structure 1000 can rupture when the air pressure is relatively high to quickly release the air pressure, thereby improving the performance stability of the battery.

[0097] The utility model also provides a battery, including a shell (not shown), a battery cell (not shown) and a cover assembly in an embodiment of the utility model, the shell has a accommodating cavity (not shown), the battery cell is accommodated in the accommodating cavity, the cover assembly is connected to the shell and closes the accommodating cavity, and the air vent of the cover assembly is connected to the accommodating cavity.

[0098] Optionally, the battery may be a power battery, a household energy storage battery, a commercial energy storage battery, an industrial energy storage battery, etc., without limitation. Optionally, the accommodating cavity is filled with an electrolyte (not shown), and the battery cell is immersed in the electrolyte so that the battery cell can be charged and discharged by the electrolyte. Optionally, the cover plate of the cover plate assembly in the embodiment of the utility model is connected to the shell. Optionally, the cover plate and the shell can be connected and fixed by welding, clamping, bonding, riveting and screwing, etc., without limitation.

[0099] Optionally, the shell can be made of a material that meets the structural strength and is easy to process and form, specifically aluminum alloy, carbon fiber, copper alloy and other materials, without limitation. Optionally, the battery cell includes a negative electrode cell and a positive electrode cell, which are arranged alternately in sequence and isolated by an insulating diaphragm (not shown). Optionally, the positive electrode cell can use positive electrode materials such as lithium iron phosphate, nickel cobalt manganese ternary materials, lithium manganate and lithium titanate as the conductive medium, without limitation. Optionally, the negative electrode cell can use negative electrode materials such as graphite, silicon compounds, lithium titanate, lithium ferric acid and lithium as the conductive medium, without limitation.

[0100] The battery provided by the utility model adopts a shell, a battery cell and a cover plate assembly in the embodiment of the utility model. The shell has a accommodating cavity, the battery cell is accommodated in the accommodating cavity, the cover plate assembly is connected to the shell and closes the accommodating cavity, and the air vents of the cover plate assembly are connected to the accommodating cavity, thereby realizing the storage and output of electric energy. At the same time, the battery can discharge the small air pressure generated by the gas generated by the battery cell, and the battery performance is stable.

[0101] The utility model also provides an electrical equipment (not shown), including an electrical device (not shown) and a battery in an embodiment of the utility model, and the battery is suitable for supplying power to the electrical device. Optionally, the electrical equipment may be a vehicle, a household appliance, a commercial appliance, an industrial appliance, etc., without limitation. Optionally, the electrical device may be a motor, a controller, a sensor, etc., without limitation. The battery in the embodiment of the utility model realizes the storage of electrical energy and supplies power to the electrical device through the conversion between chemical energy and electrical energy. The electrical equipment realizes the storage and output of electrical energy through the electrical device and the battery in the embodiment of the utility model, and the battery is suitable for supplying power to the electrical device. At the same time, the battery can discharge the small air pressure generated by the gas generated by the battery cell, and the battery performance is stable.

[0102] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0103] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A bursting disk, characterized in that: include: A main body, comprising a first surface and a second surface opposite to each other in a thickness direction, wherein the second surface is adapted to be arranged to face the battery core, and the main body is provided with an exhaust hole penetrating the first surface and the second surface; The cover body is arranged on the first surface and closes the exhaust hole. The cover body is an elastic component. The four edges of the cover body are completely in contact with the first surface, and the cover body is suitable for elastic deformation to form a gap between at least part of the four edges of the cover body and the first surface.

2. The explosion-proof disk according to claim 1, characterized in that: The cover body includes a first edge and a second edge opposite to each other in a first direction, the first edge is connected and fixed to the first surface, and at least a portion of the second edge is bonded to the first surface.

3. The explosion-proof disk according to claim 2, characterized in that: The cover body further includes a third edge and a fourth edge opposite to each other in the second direction, the third edge connects the first edge and the second edge, and the fourth edge connects the first edge and the second edge; At least a portion of the third edge is connected and fixed to the first surface, and / or at least a portion of the fourth edge is connected and fixed to the first surface; The first direction and the second direction intersect.

4. The explosion-proof disk according to claim 3, characterized in that: The cover body includes a first plate and a second plate, the first plate is connected to the second plate, the first plate includes the first edge, the third edge and the fourth edge, the second plate includes the second edge, the first plate, the second plate and the main body form an air storage cavity, and the air storage cavity is connected to the exhaust hole.

5. The explosion-proof disk according to claim 4, characterized in that: The cover body also includes a fifth edge, which is connected to the second edge, the third edge and the fourth edge. From the fifth edge to the first edge, the size of the first plate in the third direction gradually decreases, and from the fifth edge to the second edge, the size of the second plate in the third direction gradually decreases, and the third direction intersects with the first direction and the second direction.

6. The explosion-proof disk according to claim 5, characterized in that: The maximum spacing distance between the first edge and the fifth edge in the first direction is A, and the maximum spacing distance between the second edge and the fifth edge in the first direction is B, satisfying: 2≤A / B≤4.

7. The explosion-proof disk according to claim 5, characterized in that: The exhaust hole is rotationally symmetrical about a first axis, the first axis extends along the third direction, and the cross-sectional shape of the exhaust hole at any position perpendicular to the first axis is circular, and the center of gravity of the cover body is spaced apart from the first axis.

8. The explosion-proof disk according to claim 7, characterized in that: The maximum spacing distance between the fifth edge and the first surface in the third direction is C, the minimum inner diameter of the exhaust hole is D, the maximum spacing distance between the first edge and the second edge in the first direction is E, and the maximum spacing distance between the third edge and the fourth edge in the second direction is F, satisfying: 1 / 10≤C / D≤1 / 2, and / or, satisfying: 11 / 10≤E / D≤3 / 2, and / or, satisfying: 11 / 10≤F / D≤3 / 2.

9. The explosion-proof disk according to claim 7, characterized in that: The inner diameter of the exhaust hole gradually decreases from the second surface to the first surface.

10. The explosion-proof disk according to claim 7, characterized in that: The main body is rotationally symmetric around the first axis, and the cross-sectional shape of the main body at any position perpendicular to the first axis is circular. In the orthographic projection in the third direction, the diameter of the main body is G, satisfying: 1 / 10≤D / G≤1 / 5.

11. The explosion-proof disk according to claim 10, characterized in that: The main body includes a main body portion and a connecting portion, wherein the connecting portion is arranged around the outer periphery of the main body portion, the main body portion includes the first surface and the second surface, the exhaust hole is provided in the main body portion, and a notch is provided on the outer peripheral edge of the second surface.

12. The explosion-proof disk according to claim 11, characterized in that: A dimension of the main body portion in the third direction gradually decreases from the connecting portion toward the exhaust hole.

13. The explosion-proof disk according to claim 1, characterized in that: The first surface is an outwardly convex arc surface, the second surface is an inwardly concave arc surface, the main body encloses a cavity, and the cavity is communicated with the exhaust hole.

14. An explosion-proof structure, characterized in that: It comprises a waterproof breathable membrane and an explosion-proof plate as claimed in any one of claims 1 to 13, wherein the waterproof breathable membrane is arranged on a side of the second surface of the explosion-proof plate away from the first surface.

15. The explosion-proof structure according to claim 14, characterized in that: The explosion-proof structure also includes a protective cover, which has a receiving space and is provided with an air outlet, which is communicated with the receiving space. The protective cover is connected to a side of the explosion-proof plate away from the waterproof breathable membrane, and the cover body of the explosion-proof plate is received in the receiving space.

16. A cover plate assembly, characterized in that: It comprises a cover plate and an explosion-proof structure as claimed in claim 14 or 15, wherein the cover plate is provided with a vent hole, the explosion-proof structure is connected to the cover plate, the explosion-proof structure is suitable for being configured to face away from the battery cell, and the vent hole is suitable for connecting the battery cell and the explosion-proof structure.

17. A battery, characterized in that: It comprises a shell, a battery cell and a cover assembly as described in claim 16, wherein the shell has a accommodating cavity, the battery cell is accommodated in the accommodating cavity, the cover assembly is connected to the shell and closes the accommodating cavity, and the air vent of the cover assembly is connected to the accommodating cavity.

18. An electrical equipment, characterized in that: The invention comprises an electric device and the battery as claimed in claim 17, wherein the battery is suitable for supplying power to the electric device.

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