Explosion-proof valve for liquid immersion safety and battery cell

Abstract

The utility model relates to and discloses an anti-explosion valve for liquid immersion safety and a battery cell. Relates to the technical field of new energy batteries. The explosion-proof valve specifically comprises an explosion-proof valve body, an explosion-proof nick formed on the outer side of the explosion-proof valve body and a drainage device arranged on the inner side of the explosion-proof valve body, and the projection of the drainage device and the projection of the explosion-proof nick on the explosion-proof valve body do not coincide; and when thermal runaway occurs in the battery cell, the anti-explosion valve body is outwards turned over along the anti-explosion nick to form an outwards turned part and drives the drainage device to turn over. The explosion-proof valve further comprises a drainage device, the explosion-proof valve body is turned outwards along the explosion-proof nick to form an outwards-turned part, and the drainage device is driven to synchronously turn over, so that the drainage device is positioned on the inner side of the outwards-turned part, and the outwards-turned part and the drainage device form a drainage device for connecting the inside and the outside of the battery cell, so that the surface tension of liquid is effectively broken; and the liquid can smoothly enter the battery cell along the drainage device, so that the safety performance of the lithium battery is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially is related to a kind of explosion-proof valve and electric core for liquid immersion safety. BACKGROUND

[0002] Current lithium battery is applied more and more widely, and the safety performance of lithium battery is also more and more concerned by people. At present, the lithium battery industry actively develops new application safety technology of lithium battery, among which the immersion safety technology is proposed, that is, after the lithium battery has safety problems, the lithium battery is completely immersed by injecting liquid into the closed space of the lithium battery, to prevent the lithium battery from causing thermal diffusion after safety failure.

[0003] However, after the lithium battery has safety problems and the explosion-proof valve explodes, due to the high pressure inside the lithium battery and the surface tension of the liquid, it is difficult for the liquid to enter the inside of the lithium battery, so that it is difficult to inject liquid into the closed space of the lithium battery to completely immerse the lithium battery, which affects the safety performance of the lithium battery. UTILITY MODEL CONTENTS

[0004] The utility model aims at the deficiencies of the prior art, and provides an explosion-proof valve and electric core for liquid immersion safety, which enables the liquid to smoothly enter the inside of the lithium battery after the lithium battery has safety problems and the explosion-proof valve explodes, thereby ensuring the safety performance of the lithium battery.

[0005] The utility model provides an explosion-proof valve for liquid immersion safety, which comprises an explosion-proof valve body, an explosion-proof notch formed on the outer side of the explosion-proof valve body, and a flow inducer arranged on the inner side of the explosion-proof valve body, wherein the projection of the flow inducer on the explosion-proof notch on the explosion-proof valve body does not coincide.

[0006] Further, the flow inducer is at least two oppositely arranged on the inner side of the explosion-proof valve body, and the opposite flow inducers form an included angle on the inner side of the outer turning part, and the included angle is less than 90°.

[0007] Further, the explosion-proof valve body comprises an explosion-proof sheet and a mounting ring plate, the explosion-proof notch is arranged on the outer side of the explosion-proof sheet, the flow inducer is arranged on the inner side of the explosion-proof sheet, and the projection of the flow inducer on the explosion-proof notch on the explosion-proof sheet does not coincide, and the mounting ring plate is arranged on the outer side of the explosion-proof sheet to be fixedly connected with the electric core.

[0008] Further, the mounting ring plate and the top of the explosion-proof sheet form a flow guide groove, and the flow guide groove is used for guiding the liquid.

[0009] Further, the explosion-proof notch is a plurality of semicircular concave notches arranged in cross on the explosion-proof sheet.

[0010] Further, the flow guide includes a fixed part and a flow part, the fixed part is arranged at one end of the flow part and is fixedly connected with the inner side of the explosion-proof sheet, and the flow part is used for guiding liquid.

[0011] Further, the fixed part extends upward at the top of the flow part, and when the fixed part is fixedly connected with the inner side of the explosion-proof sheet, the flow part forms a gap with the inner side of the explosion-proof sheet.

[0012] Further, the flow part is provided with a breaking surface at one end close to the explosion-proof notch, and the breaking surface is used for breaking the surface tension of liquid when liquid injection.

[0013] Further, the flow part is provided with a flow surface on opposite sides, and the two flow surfaces are respectively connected with two ends of the breaking surface and are used for guiding liquid.

[0014] The utility model also proposes a kind of electric core, including the explosion-proof valve for liquid immersion safety described above, further include top cap and shell, the top cap is fixedly connected with the shell, to close the shell, the explosion-proof valve body is arranged on the top cap.

[0015] The utility model discloses a kind of explosion-proof valve and electric core for liquid immersion safety have the following beneficial effects:

[0016] (1) the explosion-proof valve further includes flow guide, explosion-proof valve body is opened outwards along explosion-proof notch and forms outer turning part, and drives flow guide to turn over synchronously, so that flow guide is located in the inner side of outer turning part, to form the flow guide device connected inside and outside electric core by outer turning part and flow guide, effectively break liquid surface tension, so that liquid can enter into electric core inside along flow guide, further guarantee the safety performance of lithium battery;

[0017] (2) the explosion-proof valve is injected into liquid inside electric core by the opening of outer turning part, and the included angle formed by at least two flow guides arranged oppositely is acute, so that when at least two flow guides guide liquid, liquid surface tension can be effectively broken, so that liquid can enter into electric core inside along flow guide, and electric core is immersed, further guarantee the safety performance of lithium battery;

[0018] (3) the explosion-proof valve forms flow guide groove at the top of mounting ring plate and explosion-proof sheet, when explosion-proof sheet is opened outwards along explosion-proof notch and forms outer turning part, is injected into liquid inside electric core by the opening of outer turning part, and the flow guide groove formed at the top of mounting ring plate and explosion-proof sheet can guide liquid, so that liquid better flows into electric core inside from the opening of outer turning part, to guarantee the safety performance of battery;

[0019] (4) The explosion-proof notch of the explosion-proof valve is a plurality of semicircular concave notches arranged in cross on the explosion-proof sheet, so that when thermal runaway occurs in the battery cell, the explosion-proof sheet is turned outward along the plurality of semicircular concave notches arranged in cross under the action of the pressure inside the battery cell, the explosion of the explosion-proof valve is easier, the function of the explosion-proof valve to release the pressure of the battery cell is ensured, and the safety performance of the lithium battery is ensured.

[0020] (5) When the top of the fixed part is fixedly connected with the inner side of the explosion-proof sheet, there is a gap between the top of the drainage part and the inner side of the explosion-proof sheet, so that the drainage device forms a gap with the explosion-proof sheet except the contact between the fixed part and the explosion-proof sheet on the explosion-proof valve body, the normal work of the drainage device is prevented, and the safety performance of the lithium battery is ensured.

[0021] (6) When the opening of the everted part injects liquid into the battery cell, the broken surface of the drainage part close to the explosion-proof notch faces the opening of the everted part, so that when the liquid flows into the opening of the everted part, the broken surface drains the liquid, effectively breaks the surface tension of the liquid, and then the liquid can smoothly enter the battery cell along the drainage device and immerse the battery cell.

[0022] (7) The drainage part of the explosion-proof valve is provided with drainage surfaces on the opposite sides, and the drainage surfaces on the opposite sides of the drainage part are connected with the two ends of the broken surface, so that when the opening of the everted part injects liquid into the battery cell, the broken surface facing the opening of the everted part contacts the liquid, effectively breaks the surface tension of the liquid, and the liquid smoothly flows into the battery cell along the drainage surfaces on the opposite sides of the drainage part, thereby ensuring the safety performance of the lithium battery.

[0023] (8) The battery cell further comprises a top cover and a shell, the top cover is fixedly connected with the shell, the top cover seals the shell, a closed space is formed in the shell, and the explosion-proof valve body is arranged on the top cover, when the explosion-proof valve body is turned outward along the explosion-proof notch to form an everted part, liquid is injected into the shell through the opening of the everted part, the drainage device on the everted part can effectively break the surface tension of the liquid, the liquid can enter the shell along the drainage device, and the safety performance of the lithium battery is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application. In these drawings, like reference numerals are used to represent similar elements.

[0025] Figure 1 It is a cross-sectional view of the explosion-proof valve body of the explosion-proof valve for liquid immersion safety after explosion of the explosion-proof valve body.

[0026] Figure 2 It is a cross section schematic view of the explosion-proof valve body before explosion of the explosion-proof valve for liquid immersion safety of the utility model embodiment;

[0027] Figure 3 It is a structure schematic view of the explosion-proof valve body after explosion of the explosion-proof valve for liquid immersion safety of the utility model embodiment;

[0028] Figure 4 It is a structure schematic view of the explosion-proof valve body after explosion of the explosion-proof valve for liquid immersion safety of the utility model embodiment;

[0029] Figure 5 It is a structure schematic view of the flow inducer in the inside of the explosion-proof valve body of the explosion-proof valve for liquid immersion safety of the utility model embodiment;

[0030] Figure 6 It is a structure schematic view of the flow inducer of the explosion-proof valve for liquid immersion safety of the utility model embodiment;

[0031] Figure 7 It is a structure schematic view of the explosion-proof valve body of the utility model embodiment.

[0032] In the drawing: 1, explosion-proof valve body; 11, explosion-proof notch; 12, everted part; 13, explosion-proof sheet; 14, mounting ring plate; 15, flow guide groove; 2, flow inducer; 21, fixed part; 22, flow inducing part; 221, breaking surface; 222, flow inducing surface; 3, top cover; 4, shell. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings in the utility model embodiment, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.

[0034] Please refer to Figures 1-7 The utility model embodiment provides a kind of explosion-proof valve for liquid immersion safety, including explosion-proof valve body 1, the explosion-proof notch 11 formed in the outside of explosion-proof valve body 1, and the flow inducer 2 being located in the inside of explosion-proof valve body 1, the projection of flow inducer 2 and explosion-proof notch 11 on explosion-proof valve body 1 does not coincide;When thermal runaway occurs in the inside of explosion-proof valve body 1, it is formed everted part 12 along explosion-proof notch 11 and drives flow inducer 2 to overturn and is outwards.

[0035] In the present application, the explosion-proof valve includes an explosion-proof valve body 1 and an explosion-proof notch 11, which is formed on the outer side of the explosion-proof valve body 1. When thermal runaway occurs inside the cell of the lithium battery, the pressure inside the cell increases, and under the action of the pressure inside the cell, the explosion-proof valve body 1 is turned outward along the explosion-proof notch 11 to form an outward turning part 12, thereby relieving the pressure of the cell through the explosion-proof valve body 1, and preventing the cell from exploding to cause more serious safety accidents.

[0036] Currently, the lithium battery industry proposes a kind of immersion safety technology, that is, after the cell generates thermal runaway, liquid is injected into the cell, and the liquid is immersed in the cell. On the one hand, the liquid directly acts on the thermal runaway cell to quickly reduce the temperature of the thermal runaway cell and inhibit the thermal runaway reaction, and block the temperature diffusion between the cells, thereby preventing the spread of thermal runaway of the cells and ensuring the safety performance of the cells.

[0037] On the other hand, thermal runaway of the cell is usually caused by internal short circuit of the cell, so by immersing the cell in liquid, the short circuit of the cell can also be prevented, thereby ensuring that the cell can continue to be used and prolonging the service life of the cell. It can be predicted that in the present application, the liquid injected into the cell can be electrolyte or cooling liquid with insulation performance.

[0038] In the present application, when the cell generates thermal runaway and the explosion-proof valve body 1 is turned outward along the explosion-proof notch 11 to form an outward turning part 12, liquid can be injected into the cell through the opening of the outward turning part 12. During the injection of the liquid, due to the high pressure inside the cell and the surface tension of the liquid, it may be difficult for the liquid to enter the cell, thereby making it difficult to inject the liquid into the cell and completely immerse the cell, which affects the safety performance of the cell.

[0039] Therefore, in the present application, the explosion-proof valve further includes a flow inducer 2, which is arranged on the inner side of the explosion-proof valve body 1, and the flow inducer 2 arranged on the inner side of the explosion-proof valve body 1 is arranged such that the projection of the explosion-proof notch 11 arranged on the outer side of the explosion-proof valve body 1 on the explosion-proof valve body 1 does not coincide, so that when the cell generates thermal runaway, the flow inducer 2 located on the inner side of the explosion-proof valve body 1 does not act on the pressure inside the cell to affect the turning of the explosion-proof valve body 1 outward along the explosion-proof notch 11, thereby ensuring the function of the explosion-proof valve body 1 relieving the pressure of the cell.

[0040] When the explosion-proof valve body 1 is flipped outward along the explosion-proof notch 11 to form the outwardly flipped portion 12, the flow director 2 is flipped synchronously, so that the flow director 2 is located inside the outwardly flipped portion 12. When the opening of the outwardly flipped portion 12 injects liquid into the inside of the battery cell, the flow director 2 and the outwardly flipped portion 12 form a flow device connected to the inside and outside of the battery cell, which can effectively break the surface tension of the liquid, so that the liquid enters the inside of the battery cell along the flow director 2, thereby effectively solving the problem that the liquid stays in the opening of the outwardly flipped portion 12 and does not enter the inside of the battery cell due to the high pressure in the battery cell and the surface tension of the liquid, and further enabling the liquid injection through the opening of the outwardly flipped portion 12 to proceed smoothly, thereby ensuring the safety performance of the lithium battery.

[0041] Specifically, in the present embodiment, the flow director 2 is at least two oppositely arranged inside the explosion-proof valve body 1, and the oppositely arranged flow directors 2 form an included angle inside the outwardly flipped portion 12, and the included angle is less than 90°. In the present application, at least two flow directors 2 are oppositely arranged inside the explosion-proof valve body 1, and when the explosion-proof valve body 1 is flipped outward along the explosion-proof notch 11 to form the outwardly flipped portion 12, the at least two flow directors 2 are flipped synchronously, so that the oppositely arranged at least two flow directors 2 form an included angle inside the outwardly flipped portion 12, and the included angle is an acute angle less than 90°.

[0042] When liquid is injected into the inside of the battery cell through the opening of the outwardly flipped portion 12, the included angle formed by the oppositely arranged at least two flow directors 2 is an acute angle, so that when the at least two flow directors 2 guide the liquid, the surface tension of the liquid can be effectively broken, and the liquid can smoothly enter the inside of the battery cell along the flow director 2, thereby submerging the battery cell and further ensuring the safety performance of the lithium battery.

[0043] In the present embodiment, the explosion-proof valve body 1 includes an explosion-proof sheet 13 and a mounting ring plate 14, the mounting ring plate 14 is arranged outside the explosion-proof sheet 13, and the mounting ring plate 14 is fixedly connected with the top cover 3 of the battery cell, so as to fix and mount the explosion-proof valve body 1 on the battery cell. Specifically, in actual implementation, the mounting ring plate 14 can be fixedly connected with the top cover 3 of the battery cell by laser welding, so as to ensure the stability of the fixed mounting of the explosion-proof valve body 1 on the top cover 3 and prevent the explosion-proof valve body 1 from falling off.

[0044] The explosion-proof notch 11 is arranged outside the explosion-proof sheet 13, and when thermal runaway occurs in the inside of the battery cell of the lithium battery, the explosion-proof sheet 13 is flipped outward along the explosion-proof notch 11 to form the outwardly flipped portion 12, so as to relieve the pressure in the battery cell through the explosion-proof sheet 13 and prevent more serious safety accidents caused by explosion of the battery cell.

[0045] The flow guide 2 is arranged at the inner side of the explosion-proof sheet 13 and does not coincide with the projection of the explosion-proof notch 11 on the explosion-proof sheet 13, so that when the internal heat of the battery cell is out of control, the flow guide 2 at the inner side of the explosion-proof sheet 13 does not act on the pressure in the battery cell to affect the opening of the explosion-proof sheet 13 along the explosion-proof notch 11, thereby ensuring the function of the explosion-proof sheet 13 to release the pressure of the battery cell.

[0046] When the explosion-proof sheet 13 is opened outward to form the outward turning part 12 along the explosion-proof notch 11, the flow guide 2 is turned synchronously to be located at the inner side of the outward turning part 12. When the liquid is injected into the battery cell through the opening of the outward turning part 12, the outward turning part 12 and the flow guide 2 form a flow guide device connecting the inside and outside of the battery cell, which can effectively break the surface tension of the liquid and make the liquid enter the battery cell along the flow guide 2, thereby effectively solving the problem that the liquid stays in the opening of the outward turning part 12 and does not enter the battery cell due to the high pressure in the battery cell and the surface tension of the liquid, and further ensuring the safety performance of the battery.

[0047] In the embodiment, when the mounting ring plate 14 is arranged around the outer periphery of the explosion-proof sheet 13, the height of the top of the mounting ring plate 14 is greater than the height of the top of the explosion-proof sheet 13, so that a flow guide groove 15 is formed between the top of the mounting ring plate 14 and the top of the explosion-proof sheet 13. When the explosion-proof sheet 13 is opened outward to form the outward turning part 12 along the explosion-proof notch 11, and the liquid is injected into the battery cell through the opening of the outward turning part 12, the flow guide groove 15 formed between the top of the mounting ring plate 14 and the top of the explosion-proof sheet 13 can guide the liquid, so that the liquid flows into the battery cell from the opening of the outward turning part 12, thereby ensuring the safety performance of the battery.

[0048] In the embodiment, the explosion-proof notch 11 is a plurality of semicircular notches arranged on the explosion-proof sheet 13, so that when the battery cell is out of control, the explosion-proof sheet 13 is opened outward along the plurality of semicircular notches arranged in cross, on the one hand, the explosion-proof valve is easier to burst, thereby ensuring the function of the explosion-proof valve to release the pressure of the battery cell, and further ensuring the safety performance of the lithium battery.

[0049] On the other hand, when the explosion-proof sheet 13 is opened outward along the plurality of semicircular notches arranged in cross to form the outward turning part 12 extending upward in multiple petals, at least two oppositely arranged flow guides 2 are turned synchronously, so that the at least two oppositely arranged flow guides 2 are respectively located at the inner side of the two opposite petals of the outward turning part 12, and an included angle is formed between the at least two flow guides 2, thereby forming a flow guide device connecting the inside and outside of the battery cell with the plurality of petals of the outward turning part 12 and the at least two flow guides 2.

[0050] When the liquid is injected into the interior of the battery cell through the opening of the multi-flap outward turning part 12, the multi-flap outward turning part 12 first guides the liquid to flow better through the opening of the multi-flap outward turning part 12 towards the interior of the battery cell; when the liquid flows to the position of the flow guide 2, the flow guide 2 further guides the liquid to break the surface tension of the liquid, so that the liquid can smoothly enter the interior of the battery cell along the flow guide 2, immerse the battery cell, and further ensure the safety performance of the lithium battery.

[0051] In the embodiment, the flow guide 2 includes a fixed part 21 and a flow part 22, the fixed part 21 is arranged at one end of the flow part 22, and the fixed part 21 is fixedly connected with the inner side of the explosion-proof sheet 13 to fix the flow part 22 on the inner side of the explosion-proof sheet 13, so that when the explosion-proof sheet 13 is turned outward along the explosion-proof notch 11 to form the outward turning part 12, the fixed part 21 and the flow part 22 are synchronously turned to make the flow part 22 located on the inner side of the outward turning part 12, and then when the liquid is injected into the interior of the battery cell through the opening of the outward turning part 12, the flow part 22 guides the liquid to effectively break the surface tension of the liquid, so that the liquid can smoothly enter the interior of the battery cell along the flow guide 2 and immerse the battery cell.

[0052] In actual implementation, the fixed part 21 can be fixedly connected with the inner side of the explosion-proof sheet 13 by spot welding, so that after the explosion-proof sheet 13 is broken, the flow part 22 is turned at the same angle as the explosion-proof sheet 13.

[0053] Specifically, in the embodiment, the fixed part 21 extends upward at the top of the flow part 22, that is, the top of the fixed part 21 is higher than the top of the flow part 22, so that when the top of the fixed part 21 is fixedly connected with the inner side of the explosion-proof sheet 13 to fix the flow part 22 on the inner side of the explosion-proof sheet 13, there is a gap between the top of the flow part 22 and the inner side of the explosion-proof sheet 13, that is, the flow part 22 is spaced apart from the explosion-proof sheet 13 by a certain distance, so that the flow guide 2 is in contact with the explosion-proof sheet 13 only at the fixed part 21 on the explosion-proof valve body 1, and the rest of the flow guide 2 is spaced apart from the explosion-proof sheet 13, thereby preventing the flow guide 2 from affecting the normal work of the explosion-proof valve and ensuring the safety performance of the lithium battery.

[0054] In the embodiment, the flow part 22 is provided with a breaking surface 221 at one end close to the explosion-proof notch 11. When the pressure in the battery acts on the explosion-proof sheet 13 to make the explosion-proof sheet 13 turn outward along the explosion-proof notch 11 to form the outward turning part 12, the flow part 22 fixed on the inner side of the explosion-proof sheet 13 by the fixed part 21 is turned upward together with the explosion-proof sheet 13.

[0055] When liquid is injected into the cell through the opening of the outward-turned part 12, the tension-breaking surface 221 of the drain part 22 near the explosion-proof notch 11 faces the opening of the outward-turned part 12. As the liquid flows in through the opening of the outward-turned part 12, the tension-breaking surface 221 guides the liquid, effectively breaking the surface tension of the liquid, so that the liquid can smoothly enter the cell along the drain 2 and immerse the cell.

[0056] Specifically, in actual implementation, the breaking surface 221 can be an arc surface or a slope surface located at the end of the drain section 22 near the explosion-proof notch 11. When liquid is injected through the opening of the outward-turned part 12, under the action of the pressure inside the cell and the surface tension of the liquid, the liquid agglomerates at the opening of the outward-turned part 12 and does not enter the cell.

[0057] In this application, the tension breaking surface 221 of the end of the drain section 22 near the explosion-proof notch 11 faces the opening of the outward-facing section 12. The tension breaking surface 221 of the arc or inclined surface comes into contact with the liquid, effectively breaking the surface tension of the liquid, allowing the liquid to smoothly enter the cell along the drainer 2, thereby ensuring the safety performance of the lithium battery.

[0058] In this embodiment, a flow-guiding surface 222 is provided on both sides of the flow-guiding part 22. The flow-guiding surfaces 222 on both sides of the flow-guiding part 22 are connected to the two ends of the tension-breaking surface 221, so that when liquid is injected into the cell through the opening of the outward-turned part 12, the tension-breaking surface 221 facing the opening of the outward-turned part 12 comes into contact with the liquid, effectively breaking the surface tension of the liquid, so that the liquid flows smoothly into the cell along the flow-guiding surfaces 222 on both sides of the flow-guiding part 22, thereby ensuring the safety performance of the lithium battery.

[0059] This utility model embodiment also provides a battery cell, including the aforementioned explosion-proof valve for liquid immersion safety, and further including a top cover 3 and a housing 4. The top cover 3 is fixedly connected to the housing 4, thereby sealing the housing 4 and forming a closed space inside the housing 4. The explosion-proof valve body 1 is disposed on the top cover 3. When the battery cell experiences thermal runaway, the pressure inside the housing 4 increases. Under the action of the pressure inside the housing 4, the explosion-proof valve body 1 flips outward along the explosion-proof notch 11 to form an outwardly folded part 12, thereby relieving pressure on the battery cell through the explosion-proof valve body 1 and preventing the battery cell from exploding and causing a more serious safety accident.

[0060] When the explosion-proof valve body 1 is flipped outward along the explosion-proof groove 11 to form the outward flipped part 12, liquid is injected into the housing 4 through the opening of the outward flipped part 12. The drain 2 located inside the outward flipped part 12 can effectively break the surface tension of the liquid, so that the liquid can enter the housing 4 along the drain 2, thereby ensuring the safety performance of the lithium battery.

[0061] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An explosion-proof valve for liquid immersion safety, characterized in that: It includes an explosion-proof valve body (1), an explosion-proof groove (11) formed on the outside of the explosion-proof valve body (1), and a drainer (2) provided on the inside of the explosion-proof valve body (1). The projections of the drainer (2) and the explosion-proof groove (11) on the explosion-proof valve body (1) do not coincide. When thermal runaway occurs inside the battery cell, the explosion-proof valve body (1) flips outward along the explosion-proof groove (11) to form an outward flipped part (12) and drives the drainer (2) to flip.

2. The explosion-proof valve for liquid immersion safety as described in claim 1, characterized in that: The drainers (2) are at least two arranged opposite each other on the inner side of the explosion-proof valve body (1), and the two drainers (2) form an angle on the inner side of the outward-turned part (12), the angle being less than 90°.

3. The explosion-proof valve for liquid immersion safety as described in claim 1, characterized in that: The explosion-proof valve body (1) includes an explosion-proof sheet (13) and a mounting ring plate (14). The explosion-proof groove (11) is located on the outside of the explosion-proof sheet (13). The drainer (2) is located on the inside of the explosion-proof sheet (13) and does not coincide with the projection of the explosion-proof groove (11) on the explosion-proof sheet (13). The mounting ring plate (14) surrounds the outside of the explosion-proof sheet (13) and is used to fix it to the battery cell.

4. The explosion-proof valve for liquid immersion safety as described in claim 3, characterized in that: The mounting ring plate (14) and the top of the explosion-proof plate (13) form a flow guide groove (15), which is used to guide the liquid.

5. The explosion-proof valve for liquid immersion safety as described in claim 3, characterized in that: The explosion-proof groove (11) is a plurality of semi-circular indentations that are intersected on the explosion-proof sheet (13).

6. The explosion-proof valve for liquid immersion safety as described in claim 3, characterized in that: The drainer (2) includes a fixing part (21) and a draining part (22). The fixing part (21) is located at one end of the draining part (22) and is used to be fixedly connected to the inner side of the explosion-proof sheet (13). The draining part (22) is used to drain liquid.

7. The explosion-proof valve for liquid immersion safety as described in claim 6, characterized in that: The fixing part (21) extends upward from the top of the draining part (22). When the fixing part (21) is fixedly connected to the inner side of the explosion-proof sheet (13), a gap is formed between the draining part (22) and the inner side of the explosion-proof sheet (13).

8. The explosion-proof valve for liquid immersion safety as described in claim 6, characterized in that: The drainage section (22) has a breaking surface (221) at one end near the explosion-proof groove (11), which is used to break the surface tension of the liquid during injection.

9. An explosion-proof valve for liquid immersion safety as described in claim 8, characterized in that: The drainage section (22) has drainage surfaces (222) on both sides opposite to each other. The two drainage surfaces (222) are respectively connected to the two ends of the tension breaking surface (221) to drain the liquid.

10. A battery cell, characterized in that, The explosion-proof valve for liquid immersion safety as described in any one of claims 1-9 further includes a top cover (3) and a housing (4), wherein the top cover (3) is fixedly connected to the housing (4) for sealing the housing (4), and the explosion-proof valve body (1) is disposed on the top cover (3).

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