Explosion-proof valve assembly and battery

Abstract

The utility model provides an anti-explosion valve assembly and a battery, the anti-explosion valve assembly is arranged on a cover body of the battery, the anti-explosion valve assembly comprises a groove body, an anti-explosion sheet and a sharp part, the groove body is arranged on the cover body in an integrally formed protruding manner, and a through hole is formed in the groove wall of the groove body; the anti-explosion sheet is connected with the cover body and seals the opening end of the groove body; the pointed part is arranged on the groove wall. Therefore, when the battery is in thermal runaway, the pressure in the inner cavity of the battery is increased, the explosion-proof sheet is extruded to expand towards one side where the groove body is located, and the tip-shaped part punctures the explosion-proof sheet, so that the air pressure in the battery is prevented from exceeding a set value of the battery, and explosion is avoided. According to the anti-explosion valve assembly, expensive materials are not used, machining of a scribing machining grinding tool is not needed, and therefore the cost of the anti-explosion valve assembly in the machining process is reduced. And meanwhile, when electrolyte is injected into the battery by the groove body, the electrolyte is prevented from flowing into the anti-explosion valve assembly to pollute the anti-explosion valve assembly.

Description

Technical Field

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

[0002] With the rapid development of battery technology, especially lithium-ion batteries, the existing explosion-proof valves of batteries are stamped with precision molds to form engraved lines. The engraved lines are weaker than the surrounding areas. When the internal pressure of the battery is too high and exceeds the explosion pressure of the explosion-proof valve, the explosion-proof valve will rupture at the engraved lines. In order to ensure the high consistency of the explosion pressure of the explosion-proof valve, the material cost of the explosion-proof valve is expensive, and the cost of developing the engraved line processing mold is high. Utility Model Content

[0003] In view of this, the present application provides an explosion-proof valve assembly to solve the problem of high processing cost of explosion-proof valves in the prior art. The present application also provides a battery including the above-mentioned explosion-proof valve assembly.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] An explosion-proof valve assembly, arranged on a cover of a battery, comprises:

[0006] A trough body, wherein an integrally formed protrusion is arranged on the cover body, and a through hole is provided on the trough wall of the trough body;

[0007] An explosion-proof disk connected to the cover body and / or the trough body and sealing the open end of the trough body;

[0008] The pointed portion is arranged on the groove wall.

[0009] Optionally, the explosion-proof sheet includes a sheet-shaped portion and an annular portion, the annular portion is connected to the cover body, and the sheet-shaped portion is arranged between the annular portion and the cover body.

[0010] Optionally, the pointed portion is arranged on the bottom wall of the trough body.

[0011] Optionally, in a direction perpendicular to the cover body, the groove depth of the groove body is T, and the height of the pointed portion is H, wherein: T≥1mm, and / or, 1mm≤H≤T.

[0012] Optionally, in a direction perpendicular to the cover body, the thickness W of the explosion-proof disk satisfies: 0.001 mm≤W≤1 mm.

[0013] Optionally, the explosion-proof disk is provided with reinforcing ribs; and / or, the explosion-proof disk is provided with a thinning area.

[0014] Optionally, the area of ​​the explosion-proof disk is S 0 After the explosion-proof valve assembly explodes, the maximum opening area of ​​the explosion-proof disc is S 1, where S 0 and S 1 Satisfy: 0.1≤S 1 :S 0 ≤1.

[0015] Optionally, the area of ​​the through hole is S 2 The bottom wall area of ​​the tank is S 3 , where S 2 and S 3 Satisfy: 0.1≤S 2 :S 3 ≤1.

[0016] Optionally, the edge of the explosion-proof disk or the annular portion is welded to the cover body, and the welding depth is 0.2 mm-3 mm.

[0017] A battery, comprising a battery cell and a cover, wherein the cover comprises the explosion-proof valve assembly described in any one of the above items, and the cover is a top cover, a bottom cover or a side wall of the battery;

[0018] The cover body is provided with a sunken platform for mounting the explosion-proof plate, and a fixing piece is provided between the sunken platform and the explosion-proof plate.

[0019] The explosion-proof valve assembly provided by the present application has an integrally formed protrusion of the trough body disposed on the cover body, and a through hole is provided on the trough wall of the trough body; the explosion-proof plate is connected to the cover body, and seals the open end of the trough body to isolate the inner cavity of the battery and the trough body; the pointed portion is disposed on the trough wall, and can pierce the explosion-proof plate that is deformed due to the increase in pressure in the battery. In this way, when the battery is thermally runaway, the pressure in the inner cavity of the battery will increase, squeezing the explosion-proof plate to expand the explosion-proof plate toward the side where the trough body is located, and the pointed portion pierces the explosion-proof plate to prevent the air pressure in the battery from exceeding the set value of the battery and avoiding an explosion. The explosion-proof valve assembly does not need to use expensive materials or perform line engraving and mold processing to reduce the cost of the explosion-proof valve assembly processing process. At the same time, the trough body can also prevent the electrolyte from flowing into the explosion-proof valve assembly and contaminating the explosion-proof valve assembly when injecting electrolyte into the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 A three-dimensional diagram of a cover body of an explosion-proof valve assembly provided in an embodiment of the present application;

[0022] Figure 2 A three-dimensional diagram of a cover body of an explosion-proof valve assembly in another embodiment;

[0023] Figure 3 When the battery is working normally Figure 1 Sectional view at AA;

[0024] Figure 4 When the battery thermal runaway occurs Figure 1 Sectional view at AA;

[0025] Figure 5 for Figure 2 Sectional view at the middle BB;

[0026] Figure 6 for Figure 5 Enlarged view of point C in the middle.

[0027] exist Figure 1-Figure 6 middle:

[0028] 1- trough body, 2- explosion-proof disk, 3- pointed part, 4- cover body, 5- through hole, 6- fixing piece, 7- sinking platform;

[0029] 11- bottom wall, 21- sheet-shaped portion, 22- annular portion. DETAILED DESCRIPTION

[0030] The present application provides an explosion-proof valve assembly and a battery including the explosion-proof valve assembly.

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] like Figures 1 to 6As shown, the embodiment of the present application provides an explosion-proof valve assembly, which is arranged on the cover body 4, and the cover body 4 and the battery cell, electrolyte and shell together form a battery. The explosion-proof valve assembly mainly includes a tank body 1, an explosion-proof plate 2 and a pointed portion 3. The tank body 1 is integrally formed with a protrusion arranged on the cover body 4, and a through hole 5 is provided on the tank wall of the tank body 1; the explosion-proof plate 2 is connected to the cover body 4 and / or the tank body 1, and seals the open end of the tank body 1 to isolate the inner cavity of the battery and the tank body 1; the pointed portion 3 is arranged on the tank wall, and can pierce the explosion-proof plate 2 deformed due to the increase in pressure in the battery. Specifically, when the battery has thermal runaway and the pressure in the battery cavity increases, since the pressure in the battery cavity is greater than the external atmospheric pressure, the explosion-proof disc 2 with a certain degree of ductility expands to the side away from the battery cavity, so that the explosion-proof disc 2 gradually approaches the pointed portion 3 set on the wall of the tank body 1, and the pointed portion 3 will pierce the explosion-proof disc 2 deformed due to the increase in pressure in the battery, and the gas in the battery will be discharged from the through hole 5 on the wall of the tank body 1 to achieve pressure relief in the battery cavity, thereby preventing the battery from exploding. When the pointed portion 3 pierces the explosion-proof disc 2, the bottom wall 11 and side walls of the tank body 1 will block the splashing of fragments, and the gas will be discharged from the through hole 5, thereby improving the safety performance of the explosion-proof valve assembly when in use.

[0033] It should be noted that the tank body 1 is integrally stamped with the cover body 4, which can stabilize the structure of the tank body 1 and prevent the tank body 1 from being ejected when an explosion occurs, thereby ensuring the stability of the connection between the tank body 1 and the cover body 4 and ensuring the safety of the battery when an explosion occurs.

[0034] It should also be noted that the explosion-proof disc 2 can be connected to the cover body 4, and the explosion-proof disc 2 can also be connected to the tank body 1. In order to improve the stability of the connection, the explosion-proof disc 2 can be connected to the cover body 4 and the tank body 1 at the same time, and the explosion-proof disc 2 can seal the open end of the tank body 1, so that the explosion-proof disc 2 isolates the tank body 1 and the inner cavity of the battery. In this way, when the pressure in the inner cavity of the battery increases, the explosion-proof disc 2 can expand due to the increase in the inner cavity pressure of the battery and has been punctured by the pointed portion 3 to achieve the explosion-proof function. At the same time, when injecting electrolyte into the battery, since the tank body 1 protrudes from the cover body, the electrolyte can be prevented from flowing into the explosion-proof valve assembly to contaminate the explosion-proof valve assembly.

[0035] In this embodiment, further, the pointed portion 3 and the trough body 1 are integrally formed, and such a configuration improves the stability of the connection between the pointed portion 3 and the trough body 1 .

[0036] Exemplarily, preferably, the explosion-proof plate 2 can be made of the same material as the cover body 4 or a material with good welding performance. By directly welding the explosion-proof plate 2 to the cover body 4 and / or the trough body 1, the explosion-proof plate 2 can be quickly connected to the cover body 4 and / or the trough body 1.

[0037] In the explosion-proof valve assembly of the above structure, the trough body 1 is integrally formed with a protrusion disposed on the cover body 4, and a through hole 5 is provided on the trough wall of the trough body 1; the explosion-proof plate 2 is connected to the cover body 4, and seals the open end of the trough body 1 to isolate the inner cavity of the battery and the trough body 1; the pointed portion 3 is disposed on the trough wall, and can pierce the explosion-proof plate 2 that is deformed due to the increase in pressure inside the battery. In this way, when the battery thermally runs away, the pressure in the inner cavity of the battery will increase, squeezing the explosion-proof plate 2 so that the explosion-proof plate 2 expands toward the side where the trough body 1 is located, and the pointed portion 3 pierces the explosion-proof plate 2 to prevent the gas pressure inside the battery from exceeding the set value of the battery, thereby avoiding an explosion. The explosion-proof valve assembly does not require the use of expensive materials, and does not require line engraving and mold processing, so as to reduce the cost of the explosion-proof valve assembly processing process.

[0038] In some embodiments, see Figure 2 The explosion-proof disk 2 includes a sheet portion 21 and an annular portion 22, the annular portion 22 is connected to the cover body 4, and the sheet portion 21 is arranged between the annular portion 22 and the cover body 4, so that the sheet portion 21 and the cover body 4 can be connected. The connection between the annular portion 22 and the cover body 4 is preferably welded, so that the annular portion 22 and the cover body 4 can be tightly connected, and then the sheet portion 21 and the cover body 4 can be firmly connected.

[0039] It should be noted that the material of the sheet portion 21 can be the same metal material (aluminum, copper, stainless steel, etc.) as the material of the annular portion 22, and the sheet portion 21 and the annular portion 22 can be integrally punched. Since the sheet portion 21 is fixed to the cover body 4 by the connection between the annular portion 22 and the cover body 4, the material of the sheet portion 21 can be different from the material of the annular portion 22. For example, the annular portion 22 is made of a metal material that can be welded to the cover body 4, and the material of the annular portion 22 can be the same as or different from that of the cover body 4. The sheet portion 21 can be made of anti-corrosion materials such as ePTFE (expanded polytetrafluoroethylene), PET (polyethylene terephthalate), PP (polypropylene), PPS (polyphenylene sulfide), and ABS (acrylonitrile-butadiene-styrene copolymer), so as to avoid the electrolyte in the battery from corroding the sheet portion 21. Setting the explosion-proof sheet 2 as the above structure can rapidly expand the sheet portion 21 when the pressure in the battery cavity increases, thereby improving the efficiency of the pointed portion 3 piercing the sheet portion 21. Furthermore, the sheet portion 21 is configured as the above structure, so that the pointed portion 3 can easily pierce the sheet portion 21 and increase the rate at which the gas in the battery cavity flows out.

[0040] In this embodiment, a preferred implementation is provided, in which the sheet portion 21 is ePTFE, and the ePTFE material has certain small gaps, so that after the sheet portion 21 is sealed to the open end of the slot body 1 through the annular portion 22, the small gaps of the ePTFE can allow a certain amount of gas to enter and exit the battery, thereby ensuring that the pressure inside and outside the battery is the same, and avoiding the battery shell bulging due to thermal expansion and contraction. However, when the battery has thermal runaway and the pressure in the battery cavity increases, a large amount of gas causes the sheet portion 21 to bulge, causing the sheet portion 21 to touch the pointed portion 3, causing the sheet portion 21 to rupture and cause an explosion action, and the ePTFE sheet portion 21 does not affect the normal progress of the explosion action.

[0041] The explosion-proof disc 2 is welded to the cover body 4 or assembled in other ways, and the explosion-proof valve assembly is subjected to helium inspection, and the helium leak rate is ensured to be less than 10^-5Pa·m3 / s, and the bursting pressure P satisfies: 0.1≤P≤10MPa. Before the explosion, the explosion-proof disc 2 fluctuates near the initial position without pressure difference. When the bursting pressure is reached, the explosion-proof valve assembly contacts the pointed portion 3 and is punctured by the pointed portion 3, and the gas expands and escapes from the punctured position. It should be noted that the helium inspection is used to detect the air tightness of the explosion-proof valve assembly, and when the explosion-proof disc 2 adopts ePTFE, the tiny gaps of ePTFE are micropores smaller than ammonia molecules, and there will be no leakage or poor air tightness. This tiny gap will only ensure that the pressure inside and outside the battery is consistent under a specific state, and will no longer work when the explosion state is reached, that is, it will not affect the normal use of the explosion-proof valve assembly. Wherein, when the explosion-proof valve assembly explodes, the pressure P inside the battery satisfies: 0.1≤P≤10MPa, and preferably, the explosion pressure is 0.4≤P≤3MPa.

[0042] In some embodiments, the pointed portion 3 is disposed on the bottom wall 11 of the tank body 1. Specifically, the pointed portion 3 is disposed on the bottom wall 11 of the tank body 1, so that the pointed portion 3 can puncture the explosion-proof disc 2, and when the pressure in the battery cavity increases, the efficiency of puncturing the explosion-proof disc 2 is improved. Further, the pointed portion 3 is disposed in a direction perpendicular to the cover body 4 (the direction indicated by the double-headed arrow Z in the figure), so that when the explosion-proof disc 2 expands due to the increase in the pressure in the battery cavity, the pointed portion 3 can quickly puncture the explosion-proof disc 2.

[0043] In addition, the pointed portion 3 can also be arranged on the side wall of the slot body 1, and the tip of the pointed portion 3 faces the side where the explosion-proof plate 2 is located, so that the explosion-proof plate 2 can be punctured by the pointed portion 3 when it expands due to the increase in pressure inside the battery, thereby ensuring the safety performance of the battery.

[0044] Further, the number of the pointed portions 3 is not limited, and one or more pointed portions 3 may be provided, preferably multiple pointed portions 3 are provided, so that the probability of the pointed portions 3 piercing the explosion-proof disk 2 can be increased. When multiple pointed portions 3 are provided, preferably the multiple pointed portions 3 have the same height, so that when the pressure in the battery cavity increases, the multiple pointed portions 3 have the same height, and when one of the pointed portions 3 cannot pierce the expanded explosion-proof disk 2, the remaining pointed portions 3 can ensure that the explosion-proof disk 2 is pierced, so as to improve the safety of the battery when an explosion occurs.

[0045] In some embodiments, in the direction perpendicular to the cover body 4, the depth of the groove body 1 is T, and the height of the pointed portion 3 is H, wherein: T ≥ 1 mm, and / or, 1 mm ≤ H ≤ T. Preferably, 2 mm ≤ T ≤ 8 mm, 1 mm ≤ H ≤ 6 mm, and H ≤ T. Specifically, in order to facilitate the arrangement of the explosion-proof plate 2, the explosion-proof plate 2 is generally flush with the open end of the groove body 1, so that the depth of the groove body 1 and the height of the pointed portion 3 are ensured to be within the above range, and the tip of the pointed portion 3 is prevented from protruding out of the groove body 1, so that when the pressure in the battery cavity does not increase, the pointed portion 3 can be prevented from puncturing the explosion-proof plate 2, thereby ensuring that when the battery pressure increases, the pointed portion 3 punctures the expanded explosion-proof plate 2, so as to improve the safety performance of the battery.

[0046] Exemplarily, the depth T of the groove body 1 can be: 1mm, 2mm, 3mm, 5mm, 8mm, 10mm, 15mm, 20mm, etc.; the height H of the pointed portion 3 can be: 1mm, 2mm, 3mm, 5mm, 8mm, 10mm, 15mm, 20mm, etc.; and it is necessary to satisfy that the height of the pointed portion 3 is less than or equal to the depth of the groove body 1.

[0047] It should be noted that the direction perpendicular to the cover body 4 is Figure 3 The direction is indicated by the double-headed arrow Z.

[0048] In some embodiments, in the direction perpendicular to the cover body 4, the thickness W of the explosion-proof disc 2 satisfies: 0.001mm≤W≤1mm. Specifically, the explosion-proof disc 2 is set to the above range. When the pressure in the battery cavity increases, when the pressure in the battery cavity increases slightly due to the normal increase in temperature during battery charging, if the thickness of the explosion-proof disc 2 is too small, the explosion-proof disc 2 is prone to damage, which prevents the explosion-proof valve from failing to play an explosion-proof role; and it can also prevent the explosion-proof disc 2 from being too thick. After the explosion-proof disc 2 expands, the pointed portion 3 cannot puncture the explosion-proof disc 2 in time. Such a setting can ensure that the explosion-proof disc 2 is punctured in time after the pressure in the battery increases.

[0049] Exemplarily, the thickness of the bursting disk 2 may be: 0.001 mm, 0.002 mm, 0.005 mm, 0.01 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 0.9 mm, 0.95 mm, 0.99 mm, 1 mm, etc.

[0050] In some embodiments, in the direction perpendicular to the cover body 4, the distance between the pointed portion 3 and the explosion-proof disc 2 is G, and G≥0 before the pressure in the battery reaches the bursting pressure. Specifically, before the pressure in the battery reaches the bursting pressure, ensure that the distance between the pointed portion 3 and the explosion-proof disc 2 is greater than or equal to 0. Since the explosion-proof disc 2 has a certain thickness, even if the distance between the explosion-proof disc 2 and the pointed portion 3 is 0, the pointed portion 3 theoretically does not puncture the explosion-proof disc 2. When the battery is in normal use, the pressure inside and outside the battery is consistent, and the pointed portion 3 and the explosion-proof disc 2 are only in contact without force, so the explosion-proof disc 2 will not be punctured. Such a setting can prevent the pointed portion 3 from puncturing the explosion-proof disc 2 before the battery pressure reaches the bursting pressure. Preferably, before the pressure in the battery reaches the bursting pressure, G>0, so that when the battery is in normal use, the explosion-proof disc 2 can be prevented from being punctured due to a slight increase in the pressure in the battery cavity caused by the shaking of the battery or the charging of the battery.

[0051] Exemplarily, the distance between the pointed portion 3 and the explosion-proof disk 2 before the pressure inside the battery reaches the bursting pressure can be: 0, 0.01mm, 0.02mm, 0.05mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1mm, etc.

[0052] In some embodiments, the explosion-proof disc 2 is provided with reinforcing ribs; and / or, the explosion-proof disc 2 is provided with a thinning area. Exemplarily, the reinforcing ribs are provided at the circumferential edge of the explosion-proof disc 2, so that when the middle of the explosion-proof disc 2 is pierced by the pointed portion 3, the reinforcing ribs located at the circumferential edge of the explosion-proof disc 2 provide support for the explosion-proof disc 2, preventing the explosion-proof disc 2 from being further torn, so as to prevent the debris splashing from the explosion-proof disc 2 inside the battery from damaging the entire explosion-proof disc 2, and to prevent further damage to the cover body 4 structure, thereby reducing the area of ​​the explosion-proof disc 2 being torn; the thinning area is provided in the central area of ​​the explosion-proof disc 2, so that when the pressure in the battery cavity increases, the explosion-proof disc 2 is not damaged. After that, the pointed portion 3 pierces the central part of the explosion-proof plate 2, and it is easy to pierce the thinned area located in the middle of the explosion-proof plate 2, and the normal thickness area located at the circumferential edge can further prevent the punctured hole from expanding; preferably, while reinforcing ribs are provided on the circumferential edge of the explosion-proof plate 2, a thinned area is provided in the central area of ​​the explosion-proof plate 2, so that when the pressure in the battery cavity increases, the thinned area is ruptured first, and then the explosion-proof plate 2 is torn along the setting direction of the reinforcing ribs, which can more effectively prevent the explosion-proof plate 2 from being torn too much.

[0053] In this embodiment, further, the area of ​​the explosion-proof disk 2 is S 0 After the explosion-proof valve assembly explodes, the maximum opening area of ​​the explosion-proof disc 2 is S 1 , where S 0 and S 1 Satisfy: 0.1≤S 1 :S 0 ≤1. Here, it is ensured that the maximum opening area of ​​the explosion-proof disc 2 after the explosion-proof valve assembly explodes and the area of ​​the explosion-proof valve assembly are within the above range, which can prevent the explosion-proof disc 2 from opening too small after the explosion-proof valve assembly explodes, thereby failing to achieve the pressure relief effect; and it can also prevent the maximum opening area of ​​the explosion-proof disc 2 from exceeding the total area of ​​the explosion-proof valve assembly, thereby avoiding damage to the battery cover 4 and other components.

[0054] It should be noted that the area of ​​the explosion-proof disk and the maximum valve opening area after the explosion-proof disk is exploded are both the areas on the plane where the cover body 4 is located. Figure 2 The plane formed by the double-headed arrows X and Y in FIG.

[0055] Exemplarily, the ratio of the maximum opening area of ​​the explosion-proof valve assembly to the area of ​​the explosion-proof valve assembly after the explosion-proof valve assembly may be: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, and so on.

[0056] In some embodiments, the area of ​​the through hole 5 is S 2 , the area of ​​the bottom wall 11 of the tank body 1 is S 3 , where S 2 and S 3 Satisfy: 0.1≤S 2 :S 3 ≤1. Specifically, the larger the area of ​​the through hole 5, the greater the exhaust efficiency, the faster the exhaust efficiency, and the better the safety of the battery; but the larger the area of ​​the through hole 5, the more likely it is to cause fragments to splash. Further, ensure that the ratio of the area of ​​the through hole 5 to the area of ​​the bottom wall 11 of the tank body 1 satisfies 0.3≤S 2 :S 3 ≤0.8 relationship, which can ensure the exhaust speed during explosion while avoiding the splashing of fragments.

[0057] It should be noted that the area of ​​the through hole 5 and the area of ​​the bottom wall 11 of the tank body 1 are both areas on the plane where the cover body 4 is located.

[0058] Exemplarily, the ratio of the area of ​​the through hole 5 to the area of ​​the bottom wall 11 of the tank body 1 may be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and so on.

[0059] In some embodiments, the explosion-proof sheet 2 is an arc-shaped sheet convexly arranged toward the side where the needle-shaped portion is located. Such an arrangement can shorten the distance between the explosion-proof sheet 2 and the needle-shaped portion, so that when the gas pressure in the battery increases, the explosion-proof sheet 2 is easily punctured by the pointed portion 3 to achieve an explosion-proof effect, thereby improving the accuracy of the explosion-proof sheet 2 being punctured.

[0060] In some embodiments, the edge or annular portion 22 of the explosion-proof disc 2 is welded to the cover body 4, and the welding depth is 0.2 mm-3 mm. Ensuring that the welding depth is within the above range can ensure the stability of welding and prevent the explosion-proof disc 2 from falling off due to the increase of the pressure in the battery cavity.

[0061] A battery includes the above-mentioned cover body 4 and the explosion-proof valve assembly, the cover body 4 includes the above-mentioned explosion-proof valve assembly, and the cover body 4 is the top cover or bottom cover of the battery. Since the cover body 4 includes the above-mentioned explosion-proof valve assembly, the beneficial effects of the cover body 4 brought by the explosion-proof valve assembly can be found in the above content, which will not be repeated here. Similarly, the beneficial effects of the battery brought by the cover body 4 can be found in the above content.

[0062] It should be noted that the battery is a square battery or a cylindrical battery.

[0063] In some embodiments, a sink 7 for mounting the explosion-proof disc 2 is provided on the cover body 4, and a fixing member 6 is provided between the sink 7 and the explosion-proof disc 2. Specifically, the sink 7 can accommodate the explosion-proof disc 2, prevent the explosion-proof disc 2 from protruding from the surface of the cover body 4, prevent the explosion-proof disc 2 from squeezing the battery core, and improve the energy density of the battery. Furthermore, the fixing member 6 is provided between the sink 7 and the explosion-proof disc 2, which can further improve the stability of the bonding between the explosion-proof disc 2 and the fixing member 6.

[0064] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0065] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0066] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0067] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0068] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0069] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. An explosion-proof valve assembly, It is characterized in that It is arranged on the cover of the battery and includes: A trough body, wherein an integrally formed protrusion is arranged on the cover body, and a through hole is provided on the trough wall of the trough body; An explosion-proof disk connected to the cover body and / or the trough body and sealing the open end of the trough body; The pointed portion is arranged on the groove wall.

2. The explosion-proof valve assembly according to claim 1, It is characterized in that The explosion-proof sheet comprises a sheet portion and an annular portion, the annular portion is connected to the cover body, and the sheet portion is arranged between the annular portion and the cover body.

3. The explosion-proof valve assembly according to claim 1, It is characterized in that The pointed portion is arranged on the bottom wall of the trough body.

4. The explosion-proof valve assembly according to claim 1, It is characterized in that In a direction perpendicular to the cover body, the groove depth of the groove body is T, and the height of the pointed portion is H, wherein: T≥1mm, and / or, 1mm≤H≤T.

5. The explosion-proof valve assembly according to claim 1, It is characterized in that In a direction perpendicular to the cover body, the thickness W of the explosion-proof disk satisfies: 0.001 mm≤W≤1 mm.

6. The explosion-proof valve assembly according to claim 1, It is characterized in that The explosion-proof disk is provided with reinforcing ribs; and / or the explosion-proof disk is provided with a thinning area.

7. The explosion-proof valve assembly according to claim 6, It is characterized in that The area of ​​the explosion-proof disk is S 0 After the explosion-proof valve assembly explodes, the maximum opening area of ​​the explosion-proof disc is S 1 , where S 0 and S 1 Satisfy: 0.1≤S 1 :S 0 ≤1.

8. The explosion-proof valve assembly according to claim 2, It is characterized in that The area of ​​the through hole is S 2 The bottom wall area of ​​the tank is S 3 , where S 2 and S 3 Satisfy: 0.1≤S 2 :S 3 ≤1.

9. The explosion-proof valve assembly according to claim 2, It is characterized in that The edge of the explosion-proof disk or the annular portion is welded to the cover body, and the welding depth is 0.2 mm-3 mm.

10. A battery, It is characterized in that It comprises a battery cell and a cover, the cover comprising the explosion-proof valve assembly according to any one of claims 1 to 9, and the cover is a top cover, a bottom cover or a side wall of the battery; The cover body is provided with a sunken platform for mounting the explosion-proof plate, and a fixing piece is provided between the sunken platform and the explosion-proof plate.

Images