Explosion-proof valve, end cover assembly and battery cell

Abstract

The utility model provides an anti-explosion valve, an end cover assembly and a battery cell, and relates to the technical field of batteries. The anti-explosion valve comprises a valve shell, a valve element, an elastic piece and a sealing ring. The valve shell is provided with a mounting through hole. The valve element is slidably arranged in the mounting through hole, a groove is formed in one end of the valve element, and an exhaust through hole is formed in the groove wall of the groove; two ends of the elastic piece are respectively connected with the valve core and the valve shell; the sealing ring is arranged between the valve shell and the valve element. The valve element is provided with a first position, and the sealing ring seals the matching portion between the valve shell and the valve element. The valve element has a second position, and the end, away from the groove, of the exhaust through hole communicates with the outside. According to the scheme, when the gas is accumulated in the battery cell, the valve core can be pushed to move through the gas with increased pressure in the battery cell, so as to exhaust through the exhaust through hole, so that the pressure in the battery cell can be reduced, the stress state of components in the battery cell can be improved, and the chemical reaction in the battery cell can be smoothly carried out.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an explosion-proof valve, an end cap assembly, and a battery cell. Background Technology

[0002] During use, the electrolyte or SEI (Solid-Electrolyte Interface) membrane inside the battery cell may decompose due to high temperature or other factors, producing gas. This can increase the internal pressure of the battery cell, causing the outer casing of the battery cell to swell or even rupture.

[0003] In related technologies, to prevent the battery cell casing from bulging and rupturing, an explosion-proof valve is installed on the battery cell casing. When gas is generated inside the battery cell and the internal pressure rises to a certain threshold, the explosion-proof valve opens to release the high-pressure gas inside the battery cell and relieve the internal pressure.

[0004] However, as the gas inside the battery cell accumulates and increases to the pressure threshold that allows the explosion-proof valve to open, the internal components are under pressure due to the continuous increase in internal pressure. This adversely affects the chemical reactions and components within the cell. For example, it can lead to a series of failure problems such as blue film crushing, cell short circuits, and steel strip breakage. This severely impacts the battery cell's lifespan. Utility Model Content

[0005] Embodiments of this application provide an explosion-proof valve, an end cap assembly, and a battery cell, which can alleviate the internal pressure of the battery cell.

[0006] In a first aspect, embodiments of this application provide an explosion-proof valve, which includes a valve housing, a valve core, an elastic element, and a sealing ring; the valve housing has an installation through hole; the valve core is slidably disposed in the installation through hole, and one end of the valve core is provided with a groove, the groove wall of which is provided with an exhaust through hole; both ends of the elastic element are respectively connected to the valve core and the valve housing; the sealing ring is disposed between the valve housing and the valve core; wherein, the valve core has a first position, and the sealing ring seals the mating part between the valve housing and the valve core; the valve core has a second position, and the end of the exhaust through hole away from the groove is connected to the outside.

[0007] In one embodiment, the valve core further has a third position, and the connection between the elastic element and the valve core or the connection between the elastic element and the valve housing is disconnected.

[0008] In one embodiment, a first outward flange is provided at one end of the valve core, and an elastic element is sleeved on the valve core and disposed adjacent to the first outward flange, with one end of the elastic element connected to the first outward flange.

[0009] In an embodiment, the first outward turning edge is located on one side of the valve housing and is arranged adjacent to the slot opening of the groove; the elastic member is located between the first outward turning edge and the valve housing, and the elastic member abuts against the first outward turning edge; wherein the valve core further has a third position, and the elastic member is disengaged from the abutment against the first outward turning edge.

[0010] In an embodiment, the groove wall smoothly transitions to the surface of the first outward turning edge away from the bottom wall of the groove.

[0011] In an embodiment, the elastic member is located on the side of the valve housing adjacent to the slot opening of the groove.

[0012] In an embodiment, the valve core is provided with a second outward turning edge at the end away from the slot opening of the groove, and the sealing ring is arranged on the valve core and adjacent to the second outward turning edge; wherein along the axial direction of the mounting through hole, the two end faces of the sealing ring are in sealing cooperation with the second outward turning edge and the valve housing, respectively.

[0013] In an embodiment, the valve housing is provided with a sunken platform, the mounting through hole penetrates the bottom wall of the sunken platform, and the sealing ring is located in the sunken platform.

[0014] In an embodiment, the valve core is located at the first position, and the second outward turning edge is located in the sunken platform.

[0015] In a second aspect, the embodiments of the present application provide an end cover assembly, which comprises a cover plate and the aforementioned explosion-proof valve; the valve housing is connected with the cover plate, and the mounting through hole penetrates the cover plate.

[0016] In an embodiment, the cover plate is integrally formed with the valve housing.

[0017] In a third aspect, the embodiments of the present application provide a battery cell, which comprises a housing, an electrode assembly, and the aforementioned end cover assembly; the electrode assembly is arranged in the housing; and the cover plate is covered with the housing.

[0018] The beneficial effects of the embodiments of the present application are as follows:

[0019] In the embodiments of the present application, when the gas accumulates in the battery cell, the valve core can be moved by the gas with increased pressure in the battery cell to discharge the gas through the exhaust through hole, so as to reduce the pressure in the battery cell and improve the stress state of the components in the battery cell, and facilitate the smooth chemical reaction in the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0021] Figure 1 is a structural schematic view of an explosion-proof valve provided by an embodiment of the present application;

[0022] Figure 2 is a structural schematic view of another view of an explosion-proof valve provided by an embodiment of the present application;

[0023] Figure 3 is a sectional view of A-A in Figure 1

[0024] Figure 4 is a structural schematic view of cooperation between a valve shell and a valve core provided by an embodiment of the present application;

[0025] Figure 5 is a structural schematic view of cooperation between another valve shell and a valve core provided by an embodiment of the present application;

[0026] Figure 6 is a structural schematic view of cooperation between still another valve shell and a valve core provided by an embodiment of the present application;

[0027] Figure 7 is a schematic view of a valve core located at a second position provided by an embodiment of the present application;

[0028] Figure 8 is a structural schematic view of an end cover assembly provided by an embodiment of the present application;

[0029] Figure 9 is a partial sectional view of an end cover assembly provided by an embodiment of the present application;

[0030] Figure 10 is a structural schematic view of an electric core provided by an embodiment of the present application.

[0031] Explanation of Reference Signs:

[0032] 1 - explosion-proof valve;

[0033] 11 - valve shell; 111 - mounting through hole; 112 - sink;

[0034] 12 - valve core; 121 - groove; 122 - exhaust through hole; 123 - first outward turning edge; 124 - second outward turning edge;

[0035] 13 - elastic member; 14 - sealing ring;

[0036] 2 - end cover assembly; 21 - cover plate; 22 - positive pole column; 23 - negative pole column;

[0037] 3 - electric core; 31 - shell. DETAILED DESCRIPTION

[0038] ​With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application. In addition, it should be understood that the specific implementations described herein are merely used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0040] The terms "including", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the current collector, the cap assembly and the battery cell including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to the current collector, the cap assembly and the battery cell.

[0041] In the description of the embodiments of the present application, the words "example" or "for example" are used to represent examples, illustrations, or descriptions. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The words "example" or "for example" are intended to present relative concepts in a clear manner.

[0042] Please refer to Figures 1 to 3 , Figure 1 is a structural schematic diagram of the explosion-proof valve 1 provided by the embodiments of the present application, Figure 2 is a structural schematic diagram of the explosion-proof valve 1 provided by the embodiments of the present application from another perspective, Figure 3 is Figure 1Figure 2 is a sectional view along A-A. The embodiment of the present application provides an explosion-proof valve 1. The explosion-proof valve 1 comprises a valve housing 11, a valve core 12, an elastic member 13 and a sealing ring 14. The valve housing 11 has a mounting through hole 111. The valve core 12 is slidingly arranged in the mounting through hole 111. One end of the valve core 12 is provided with a groove 121. The groove wall of the groove 121 is provided with an exhaust through hole 122. The two ends of the elastic member 13 are connected with the valve core 12 and the valve housing 11 respectively. The sealing ring 14 is arranged between the valve housing 11 and the valve core 12. The valve core 12 has a first position, and the sealing ring 14 seals the fitting part between the valve housing 11 and the valve core 12. The valve core 12 has a second position, and the exhaust through hole 122 is communicated with the outside away from one end of the groove 121.

[0043] It can be understood that when the valve core 12 is in the second position, the elastic member 13 is in an elastic deformation state.

[0044] Exemplarily, the sealing ring 14 can be sealed and fitted between the valve core 12 and the valve housing 11 by being axially pressed, as shown in Figure 3 and Figure 4 . Figure 4 is a structure schematic diagram of the valve housing 11 and the fitting between the valve housings provided by the embodiment of the present application.

[0045] Exemplarily, the sealing ring 14 can also be sealed and fitted between the valve core 12 and the valve housing 11 by being radially pressed, as shown in Figure 5 and Figure 6 . Figure 5 is another structure schematic diagram of the valve housing 11 and the fitting between the valve housings provided by the embodiment of the present application, Figure 6 is still another structure schematic diagram of the valve housing 11 and the fitting between the valve housings provided by the embodiment of the present application.

[0046] Exemplarily, the elastic member 13 can be arranged on one side of the valve housing 11 close to the notch of the groove 121, as shown in Figure 3 or Figure 5 . Figure 3 In the case that the sealing ring 14 seals the fitting part between the valve housing 11 and the valve core 12, the elastic member 13 can be in a compressed state to increase the pressure of the end face of the sealing ring 14 through the restoring force of the elastic member 13, so as to improve the sealing performance.

[0047] Exemplarily, the elastic member 13 can also be arranged on one side of the valve housing 11 away from the notch of the groove 121, as shown in Figure 4 and Figure 6 . Figure 4 In the case that the sealing ring 14 seals the fitting part between the valve housing 11 and the valve core 12, the elastic member 13 can be in a stretched state to increase the pressure of the end face of the sealing ring 14 through the restoring force of the elastic member 13, so as to improve the sealing performance.

[0048] When the explosion-proof valve 1 is applied to the battery cell 3, in a normal state, the valve core 12 is located at the first position, as shown in Figure 3 Only Figure 6 is shown. Figure 3 Only Figure 6 In the first position, the sealing ring 14 seals the fitting part between the valve shell 11 and the valve core 12. When the gas inside the battery cell 3 increases and the pressure increases, the pressure of the gas acting on the valve core 12 pushes the valve core 12 to move along the mounting hole, so that at least part of the exhaust through hole 122 moves to the side away from the notch of the groove 121 of the sealing ring 14, that is, the valve core 12 is located at the second position, as shown in Figure 7 is shown, Figure 7 is a schematic view of the valve core in the second position provided by an embodiment of the present application. Figure 7 In the figure, the dashed line is a schematic line of the exhaust path. In this way, the gas inside the battery cell 3 is sequentially discharged to the outside environment of the battery cell 3 through the groove 121 and the exhaust through hole 122. At this time, the elastic member 13 is in an elastically deformed state. The elastic member 13 can be in a compressed state or a stretched state.

[0049] Correspondingly, when the pressure inside the battery cell 3 decreases as the gas is discharged, the restoring force of the elastic member 13 drives the valve core 12 to return to the original position, that is, to move to the first position, so as to maintain the sealing fit between the valve shell 11 and the valve core 12. At the same time, the valve core 12 returning to the first position prepares for the next exhaust.

[0050] Exemplarily, the elastic member 13 includes but is not limited to an elastic rubber member, a spiral spring, and a metal elastic sheet.

[0051] Exemplarily, a waterproof and breathable film can be arranged in the exhaust through hole 122 or the groove 121, so as to avoid the leakage of electrolyte from the exhaust through hole 122 due to the exhaust action when the battery cell 3 is inverted or inclined.

[0052] In the embodiment, when the gas inside the battery cell 3 accumulates, the valve core 12 can be pushed to move by the gas with increased pressure inside the battery cell 3, so as to discharge the gas through the exhaust through hole 122, thereby reducing the pressure inside the battery cell 3 and improving the stress state of the components inside the battery cell 3, and facilitating the smooth chemical reaction inside the battery cell 3.

[0053] Meanwhile, the explosion-proof valve 1 provided by the embodiment has a simple structure and is easy to manufacture, so as to control the manufacturing cost of the explosion-proof valve 1.

[0054] In addition, when the battery cell 3 rapidly generates a large amount of gas due to thermal runaway or other reasons, so that the pressure inside the battery cell 3 increases sharply, another explosion-proof valve 1 can be used for rapid pressure relief, or the valve core 12 can be directly pushed out of the mounting through hole 111 to achieve rapid pressure relief.

[0055] In an embodiment, the valve core 12 further has a third position, and the connection between the elastic member 13 and the valve core 12 or the connection between the elastic member 13 and the valve shell 11 is disconnected.

[0056] Specifically, when the pressure on the valve core 12 reaches the threshold value, the valve core 12 is separated from the elastic member 13, and the valve core 12 is pushed out of the mounting through hole 111 by the pressure.

[0057] In the process from the normal working state of the battery cell 3 to the increase of the internal pressure, and then to the threshold value of the internal pressure, the valve core 12 correspondingly changes from the first position to the second position, and then to the third position of being separated from the mounting through hole 111.

[0058] It can be understood that the threshold value of the battery cell 3 can be different due to different models and different use environments of the battery cell 3. For example, the threshold value of the battery cell 3 with a thinner shell 31 can be set to be lower, such as 1 MPa. The threshold value of the battery cell 3 with a thicker shell 31 can be set to be higher, such as 4 MPa.

[0059] It can be understood that the pressure on the valve core 12 can break the connection between the valve core and the elastic member 13 when the pressure reaches the threshold value, so that the valve core and the elastic member 13 can be separated. Alternatively, the pressure can break the valve core, so that the valve core cannot be connected with the elastic member 13. For example, the pressure can cause the valve core to deform, so that the valve core cannot abut against the elastic member 13, so that the valve core and the elastic member 13 can be separated.

[0060] For example, the threshold value of a battery cell 3 is 2 MPa. Correspondingly, before the pressure in the battery cell 3 increases to 2 MPa, the battery cell 3 is vented through the venting through hole 122. When the pressure in the battery cell 3 reaches 2 MPa or above, the pressure in the battery cell 3 causes the valve core to be separated from the elastic member 13, and the valve core 12 is pushed out of the mounting through hole 111, so that the battery cell 3 is rapidly vented through the mounting through hole 111.

[0061] In the embodiment, the above arrangement makes the explosion-proof valve 1 vent the battery cell 3 when the pressure in the battery cell 3 slowly increases, so as to reduce the pressure in the battery cell 3. When the pressure in the battery cell 3 rapidly increases, the explosion-proof valve 1 directly vents the battery cell 3 through the mounting through hole 111, so as to effectively avoid the thermal runaway of the battery cell 3 and reduce the risk of explosion of the battery cell 3.

[0062] Please refer to Figure 3 In an embodiment, one end of the valve core 12 is provided with a first outward turning edge 123. The elastic member 13 is sleeved on the valve core 12 and is arranged adjacent to the first outward turning edge 123. One end of the elastic member 13 is connected with the first outward turning edge 123.

[0063] In the embodiment, the first outward turning edge 123 is arranged to increase the contact area between the valve core 12 and the elastic member 13, thereby improving the reliability of the contact between the valve core 12 and the elastic member 13 and improving the symmetry of the force applied to the valve core 12, so as to improve the force state of the valve core 12.

[0064] Referring to Figure 3 In an embodiment, the first outward turning edge 123 is arranged on one side of the valve shell 11 and adjacent to the groove 121. The elastic member 13 is arranged between the first outward turning edge 123 and the valve shell. The elastic member 13 is in abutment with the first outward turning edge 123. The valve core 12 further has a third position, and the elastic member 13 is out of abutment with the first outward turning edge.

[0065] It can be understood that the connection part between the first outward turning edge 123 and the valve core 12 is configured to deform when the pressure applied to the valve core 12 reaches a threshold value, and the valve core 12 and the first outward turning edge 123 are pushed out of the mounting through hole 111 by the pressure and are in the third position.

[0066] It can be understood that when the pressure inside the battery cell 3 increases, the pressure pushes the valve core 12 to move relative to the valve shell. At the same time, the pressure applied by the elastic member 13 to the first outward turning edge 123 also increases. When the pressure inside the battery cell 3 increases to a threshold value, the first outward turning edge 123 deforms to converge towards the axis of the mounting through hole 111, so that the first outward turning edge 123 is out of abutment with the elastic member 13 and can be pushed out of the mounting through hole 111.

[0067] Exemplarily, the connection part between the first outward turning edge 123 and the valve core 12 can be elastically deformed or plastically deformed when the pressure applied to the valve core 12 reaches a threshold value.

[0068] In addition, in order to facilitate the deformation of the first outward turning edge 123 when the pressure applied to the valve core 12 reaches a threshold value, the central angle of the first outward turning edge 123 is less than 180°, so as to reduce the resistance of the first outward turning edge 123 when converging towards the axis of the mounting through hole 111. For example, the first outward turning edge 123 has four first outward turning edges 123 arranged at intervals along the circumference of the mounting through hole 111, and each first outward turning edge 123 has a central angle of 20°.

[0069] Referring to Figure 3 In an embodiment, the groove wall of the groove 121 smoothly transitions to the surface of the first outward turning edge 123 away from the bottom wall of the groove 121. In this way, the stress concentration of the connection part between the valve core 12 and the first outward turning edge 123 can be improved, so as to improve the force state of the explosion-proof valve 1 and thereby improve the reliability of the explosion-proof valve 1.

[0070] Referring to Figure 3In an embodiment, the elastic member 13 is located at one side of the valve housing 11 close to the groove 121. In this way, the structure of the explosion-proof valve 1 outside the battery cell 3 is regular, which is conducive to the series and parallel connection between the battery cells 3.

[0071] Referring to Figure 3 In an embodiment, the valve core 12 is provided with a second outward turning edge 124 at one end away from the groove 121. The sealing ring 14 is sleeved on the valve core 12 and located adjacent to the second outward turning edge 124. In the axial direction of the mounting through hole 111, the two end faces of the sealing ring 14 are in sealing cooperation with the second outward turning edge 124 and the valve housing 11 respectively.

[0072] Specifically, the elastic member 13 is in a compressed state. In this way, the second outward turning edge 124 is driven to move towards the inside of the battery cell 3 by the restoring force of the elastic member 13, so as to increase the pressure of the second outward turning edge 124 acting on the sealing ring 14, thereby improving the sealing reliability.

[0073] Illustratively, the sealing surface of the sealing ring 14 can be subjected to a pressure of 0.1-0.3 MPa.

[0074] In the embodiment, the sealing between the valve housing 11 and the valve core 12 is realized by axially pressing the sealing ring 14. On the one hand, the uniformity of the force acting on the sealing ring 14 is improved, so as to facilitate the sealing ring 14 to maintain a stable sealing state. On the other hand, the precision requirement of the cooperation part between the valve housing 11, the valve core 12 and the sealing ring 14 is reduced, thereby reducing the processing cost.

[0075] Referring to Figure 3 In an embodiment, the valve housing 11 is provided with a sunken platform 112. The mounting through hole 111 penetrates the bottom wall of the sunken platform 112. The sealing ring 14 is located in the sunken platform 112. In this way, the sealing ring 14 is protected by the sunken platform 112 to avoid damage.

[0076] Referring to Figure 3 In an embodiment, the valve core 12 is located at the first position, and the second outward turning edge 124 is located in the sunken platform 112. In this way, the valve core 12 is protected by the sunken platform 112 to avoid damage.

[0077] Referring to Figure 8 , Figure 8 is a structural schematic view of an end cover assembly 2 provided by an embodiment of the present application. The embodiment of the present application further provides an end cover assembly 2. The end cover assembly 2 comprises a cover plate 21 and the aforementioned explosion-proof valve 1. The valve housing 11 is connected with the cover plate 21. The mounting through hole 111 penetrates the cover plate 21.

[0078] It can be understood that the end cover assembly 2 further comprises a positive pole 22, a negative pole 23, an upper plastic part, a lower plastic part, and the like. The upper plastic part and the lower plastic part are respectively located on both sides of the cover plate 21, and the lower plastic part and the notch of the groove 121 are located on the same side of the cover plate 21. At least one of the positive pole 22 and the negative pole 23 is insulated and separated from the cover plate 21 by the upper plastic part.

[0079] In the embodiment, when the gas in the battery cell 3 accumulates, the valve core 12 is pushed to move by the gas with the increased pressure in the battery cell 3, so that the gas is discharged through the exhaust through hole 122, thereby reducing the pressure in the battery cell 3, improving the stress state of the components in the battery cell 3, and facilitating the smooth chemical reaction in the battery cell 3.

[0080] Please refer to Figure 9 , Figure 9 is a partial sectional view of the end cover assembly 2 provided by the embodiments of the present application. In an embodiment, the cover plate 21 is integrally formed with the valve shell 11. In this way, the process step of connecting the cover plate 21 and the valve shell 11 can be omitted, thereby improving the assembly efficiency of the cover plate 21 assembly and improving the strength of the connecting part between the cover plate 21 and the valve shell 11.

[0081] Please refer to Figure 10 , Figure 10 is a structural schematic view of the battery cell 3 provided by the embodiments of the present application. The embodiments of the present application provide a battery cell 3. The battery cell 3 comprises a shell 31, an electrode assembly, and the aforementioned end cover assembly 2. The electrode assembly is arranged in the shell 31. The cover plate 21 is covered with the shell 31.

[0082] It can be understood that the electrode assembly comprises at least a positive pole sheet, a diaphragm, and a negative pole sheet which are sequentially stacked. The positive pole sheet is connected with the positive pole 22 through a positive pole lug, and the negative pole sheet is connected with the negative pole 23 through a negative pole lug.

[0083] In the embodiment, when the gas in the battery cell 3 accumulates, the valve core 12 is pushed to move by the gas with the increased pressure in the battery cell 3, so that the gas is discharged through the exhaust through hole 122, thereby reducing the pressure in the battery cell 3, improving the stress state of the components in the battery cell 3, and facilitating the smooth chemical reaction in the battery cell 3.

[0084] The embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An explosion relief valve, characterized in that The valve comprises: a valve housing having a mounting hole; a valve core slidingly arranged in the mounting hole, one end of the valve core being provided with a groove, a vent hole being arranged on the groove wall of the groove; a resilient member, two ends of which are connected with the valve core and the valve housing respectively; a sealing ring arranged between the valve housing and the valve core; wherein the valve core has a first position, and the sealing ring seals the fitting part between the valve housing and the valve core; the valve core has a second position, and the vent hole is communicated with the outside at one end away from the groove.

2. The explosion relief valve of claim 1, wherein The valve core further has a third position, and the connection part between the resilient member and the valve core or the connection part between the resilient member and the valve housing is disconnected.

3. The explosion relief valve of claim 1, wherein, One end of the valve core is provided with a first outward turning edge, the resilient member is arranged on the valve core and adjacent to the first outward turning edge, and one end of the resilient member is connected with the first outward turning edge.

4. The explosion relief valve of claim 3, wherein The first outward turning edge is located on one side of the valve housing and adjacent to the groove opening, the resilient member is located between the first outward turning edge and the valve housing, and the resilient member abuts against the first outward turning edge. The valve core further has a third position, and the resilient member is disengaged from the first outward turning edge.

5. The explosion relief valve of claim 3, wherein The groove wall smoothly transitions to the surface of the first outward turning edge away from the bottom wall of the groove.

6. Explosion relief valve according to any of claims 1-5, characterized in that The resilient member is located on the side of the valve housing close to the groove opening.

7. Explosion relief valve according to any of claims 1-5, characterized in that The valve core is provided with a second outward turning edge at one end away from the groove opening, and the sealing ring is arranged on the valve core and adjacent to the second outward turning edge. Along the axial direction of the mounting hole, the two end faces of the sealing ring are in sealing fit with the second outward turning edge and the valve housing respectively.

8. The explosion relief valve of claim 7, wherein, The valve housing is provided with a sunken platform, the mounting hole penetrates the bottom wall of the sunken platform, and the sealing ring is located in the sunken platform.

9. The explosion relief valve of claim 8, wherein, The valve core is located in the first position, and the second outward turning edge is located in the sunken platform.

10. An end cap assembly characterized by, The valve comprises: a cover plate; and the explosion-proof valve as claimed in any one of claims 1-9, the valve housing being connected with the cover plate, and the mounting hole penetrating the cover plate.

11. The end cap assembly of claim 10, wherein, The cover plate is integrally formed with the valve housing.

12. An electric cell characterized by The valve comprises: a housing; an electrode assembly arranged in the housing; and the end cover assembly as claimed in claim 10 or 11, the cover plate being covered with the housing.

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