Battery monomer, battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The use performance of the battery monomer can be improved. The battery monomer comprises a shell, an electrode assembly and a valve assembly, the shell is provided with a first accommodating space, the electrode assembly is accommodated in the first accommodating space, the valve assembly is arranged on a first wall of the shell, the valve assembly is provided with a second accommodating space, the valve assembly comprises a main body part, a valve cover part, an elastic part and a sealing assembly, and the elastic part is connected to the sealing assembly; under the condition that the air pressure in the first accommodating space is greater than or equal to a first threshold value, a part of the elastic component protrudes towards the direction of the valve cover component, and air in the first accommodating space is discharged to the outside of the battery monomer through the second accommodating space, and under the condition that the air pressure in the first accommodating space is less than or equal to a second threshold value, the elastic component is partially discharged towards the direction of the valve cover component. Part of the elastic component protrudes towards the direction of the electrode assembly, and the first containing space and the second containing space are arranged in a sealed and isolated mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a battery monomer, a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Motor vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In order to improve the safety of the battery monomer, a pressure relief mechanism is usually provided on the shell of the battery monomer to release the pressure inside the battery monomer when the pressure or temperature inside the battery monomer reaches a threshold value. However, the current pressure relief mechanism may have the problem of premature actuation of pressure relief during use, which adversely affects the use performance of the battery monomer and reduces the service life and reliability of the battery monomer. Therefore, how to improve the use performance of the battery monomer has become a technical problem to be solved in the field. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a battery monomer, a battery device, a power utilization device and an energy storage device, which can improve the use performance of the battery monomer.

[0005] In a first aspect, a battery monomer is provided, comprising: a shell having a first accommodation space; an electrode assembly accommodated in the first accommodation space; a valve assembly provided on a first wall of the shell, the valve assembly having a second accommodation space, the valve assembly comprising a main body component, a valve cover component, an elastic component and a sealing assembly, the main body component and the valve cover component enclosing the second accommodation space, the elastic component and the sealing assembly being accommodated in the second accommodation space, the elastic component being connected to the sealing assembly; wherein the elastic component is configured to: in a case where the gas pressure in the first accommodation space is greater than or equal to a first threshold A1, part of the elastic component protrudes towards the valve cover component, and the gas in the first accommodation space is discharged to the outside of the battery monomer through the second accommodation space; in a case where the gas pressure in the first accommodation space is less than or equal to a second threshold A2, part of the elastic component protrudes towards the electrode assembly, the first accommodation space and the second accommodation space are sealed and isolated, and the first threshold A1 is greater than the second threshold A2.

[0006] In the embodiments of the present application, the valve assembly is arranged on the first wall of the shell, the valve assembly includes a main body component, a valve cover component, an elastic component and a sealing assembly, the main body component and the valve cover component enclose the second accommodating space, the elastic component and the sealing assembly are accommodated in the second accommodating space, and the elastic component is connected to the sealing assembly. In the case that the gas pressure in the first accommodating space is greater than or equal to the first threshold A1, part of the elastic component protrudes towards the valve cover component, the gas in the first accommodating space is discharged to the outside of the battery monomer through the second accommodating space, so that the valve assembly can timely discharge the gas in the battery monomer to the outside of the battery monomer, reducing the risk of premature opening of the pressure relief mechanism. At the same time, in the case that the gas pressure in the first accommodating space is less than or equal to the second threshold A2, part of the elastic component protrudes towards the electrode assembly, so as to realize the sealed isolation between the first accommodating space and the second accommodating space. Compared with the technical solution of using a spring structure in the valve assembly, the time for sealing and isolating between the first accommodating space and the second accommodating space can be reduced, so as to reduce the influence of water vapor or other impurities outside the battery monomer on the inside of the battery monomer, thereby improving the use performance of the battery monomer.

[0007] In some embodiments, the difference between the first threshold A1 and the second threshold A2 satisfies: 0.1MPa≤A1-A2≤0.3MPa. In this way, in the embodiments of the present application, by setting the difference between the first threshold A1 and the second threshold A2 to satisfy: 0.1MPa≤A1-A2≤0.3MPa, in the case that the gas pressure in the first accommodating space is greater than or equal to the first threshold A1, the gas in the first accommodating space is discharged to the outside of the battery monomer through the second accommodating space, the valve assembly can timely discharge the gas in the battery monomer to the outside of the battery monomer, reducing the risk of premature opening of the pressure relief mechanism. At the same time, in the case that the gas pressure in the first accommodating space is less than or equal to the second threshold A2, the sealed isolation between the first accommodating space and the second accommodating space is realized, so as to reduce the influence of water vapor or other impurities outside the battery monomer on the inside of the battery monomer, thereby improving the use performance of the battery monomer.

[0008] In some embodiments, a difference between the first threshold value A1 and the second threshold value A2 satisfies: 0.2 MPa≤A1-A2≤0.3 MPa. In this way, in the embodiments of the present application, by setting the difference between the first threshold value A1 and the second threshold value A2 to satisfy: 0.2 MPa≤A1-A2≤0.3 MPa, so that in the case that the air pressure in the first containing space is greater than or equal to the first threshold value A1, the gas in the first containing space is discharged to the outside of the battery cell through the second containing space, the valve assembly can timely discharge the gas in the battery cell to the outside of the battery cell, reducing the risk of premature opening of the pressure relief mechanism, while in the case that the air pressure in the first containing space is less than or equal to the second threshold value A2, the sealing isolation between the first containing space and the second containing space is achieved, effectively reducing the influence of water vapor or other impurities outside the battery cell on the inside of the battery cell, thereby improving the use performance of the battery cell.

[0009] In some embodiments, the elastic component includes a deformation portion and a first extension portion connected to an outer periphery of the deformation portion and extending away from the geometric center of the elastic component, a surface of the first extension portion on the side facing the valve cover component is fixedly connected to a part of the surface of the valve cover component on the side facing the elastic component, and in the case that the air pressure in the first containing space is greater than or equal to the first threshold value, the deformation portion protrudes towards the valve cover component; in the case that the air pressure in the first containing space is less than or equal to the second threshold value, the deformation portion protrudes towards the electrode assembly.

[0010] In the embodiments of the present application, by setting the elastic component to include a deformation portion and a first extension portion, and in the case that the air pressure in the first containing space is greater than or equal to the first threshold value, the deformation portion protrudes towards the valve cover component; in the case that the air pressure in the first containing space is less than or equal to the second threshold value, the deformation portion protrudes towards the electrode assembly, the gas in the battery cell is timely discharged to the outside of the battery cell, reducing the risk of premature opening of the pressure relief mechanism, improving the use performance of the battery cell, and at the same time, the structure is simple, facilitating the processing and manufacturing of the valve assembly.

[0011] In some embodiments, in the thickness direction of the valve assembly, the maximum deformation amount L0 of the deformation portion is less than the maximum dimension L1 between the surface of the valve cover component facing the electrode assembly and the surface of the sealing assembly facing away from the electrode assembly.

[0012] In the embodiments of the present application, in the thickness direction of the valve assembly, by setting the maximum deformation amount L0 of the deformation portion to be less than the maximum dimension L1 between the surface of the valve cover component facing the electrode assembly and the surface of the sealing assembly facing away from the electrode assembly, sufficient deformation space is provided for the elastic component, improving the installation performance and use performance of the elastic component.

[0013] In some embodiments, the valve cover component is provided with a first through hole penetrating the valve cover component along the thickness direction of the valve assembly, and in a plane perpendicular to the thickness direction of the valve assembly, a projection of the deformation portion covers a projection of the first through hole.

[0014] In the embodiments of the present application, in a plane perpendicular to the thickness direction of the valve assembly, by covering the projection of the first through hole with the projection of the deformation portion, the deformation portion can protrude towards the valve cover component when the air pressure in the first accommodation space is greater than or equal to the first threshold value, and the deformation portion can protrude towards the electrode assembly when the air pressure in the first accommodation space is less than or equal to the second threshold value, so as to improve the deformation performance of the elastic component, thereby improving the use performance of the valve assembly.

[0015] In some embodiments, at least part of the surface of the first extension portion towards the valve cover component is welded to part of the surface of the valve cover component towards the elastic component. In this way, in the embodiments of the present application, by welding at least part of the surface of the first extension portion towards the valve cover component to part of the surface of the valve cover component towards the elastic component, the connection strength between the elastic component and the valve cover component is improved, and at the same time, the connection method is simple and facilitates the processing and manufacturing of the valve assembly.

[0016] In some embodiments, the main body component includes a first groove and a second groove arranged in a stepped manner, one end of the first groove is formed on the surface of the main body component away from the electrode assembly, the second groove is located on the side of the first groove towards the electrode assembly, and the openings of the first groove and the second groove are both away from the electrode assembly, wherein at least part of the valve cover component is accommodated in the first groove, and at least part of the sealing assembly is accommodated in the second groove.

[0017] In the embodiments of the present application, by arranging the main body component to include a first groove and a second groove arranged in a stepped manner, one end of the first groove is formed on the surface of the main body component away from the electrode assembly, the second groove is located on the side of the first groove towards the electrode assembly, at least part of the valve cover component is accommodated in the first groove, and at least part of the sealing assembly is accommodated in the second groove, so as to facilitate the installation of the valve cover component and the sealing assembly inside the main body component, thereby facilitating the processing and manufacturing of the valve assembly.

[0018] In some embodiments, the bottom wall of the second groove is provided with a second through hole, the second through hole communicates the first accommodation space with the second accommodation space when the air pressure in the first accommodation space is greater than or equal to the first threshold value, and in a plane perpendicular to the thickness direction of the valve assembly, a projection of the sealing assembly covers a projection of the second through hole.

[0019] In the embodiment, the bottom wall of the second groove is provided with a second through hole, and the second through hole communicates the first accommodating space and the second accommodating space when the air pressure in the first accommodating space is greater than or equal to the first threshold value, so as to timely discharge the gas in the battery monomer to the outside of the battery monomer, reduce the risk of early opening of the pressure relief mechanism, and at the same time, in the plane perpendicular to the thickness direction of the valve assembly, the projection of the sealing assembly covers the projection of the second through hole, so that the sealing assembly seals the second through hole when the air pressure in the first accommodating space is less than or equal to the second threshold value, so as to realize the sealing isolation between the first accommodating space and the second accommodating space, thereby improving the use performance of the valve assembly.

[0020] In some embodiments, the inner diameter r1 of the second through hole and the maximum dimension r2 of the sealing assembly in the thickness direction of the valve assembly satisfy: 0.5≤r1 / r2≤0.8. In this way, in the embodiment, the relationship between the inner diameter r1 of the second through hole and the maximum dimension r2 of the sealing assembly in the thickness direction of the valve assembly is set to satisfy: 0.5≤r1 / r2≤0.8, so as to balance the use performance and installation performance of the valve assembly, thereby improving the use performance of the battery monomer.

[0021] In some embodiments, the surface of the first groove facing the second accommodating space is provided with an inner recess, and the inner recess communicates the second accommodating space and the outside of the battery monomer. In this way, in the embodiment, the surface of the first groove of the main body component facing the second accommodating space is provided with an inner recess, and the inner recess communicates the second accommodating space and the outside of the battery monomer, so as to facilitate the discharge of the gas in the battery monomer to the outside of the battery monomer, reduce the risk of early opening of the pressure relief mechanism, and at the same time, the structure is simple, facilitating the processing and manufacturing of the valve assembly.

[0022] In some embodiments, the valve cover component is welded to the side wall of the first groove except the inner recess. In this way, in the embodiment, the valve cover component is welded to the side wall of the first groove except the inner recess, which can effectively balance the connection strength between the valve cover component and the main body component and the use performance of the valve assembly, and at the same time, the connection mode is simple, facilitating the processing and manufacturing of the valve assembly.

[0023] In some embodiments, the sealing assembly comprises a sealing part and a guiding part, the guiding part is located on a side of the sealing part away from the electrode assembly, a surface of the guiding part away from the electrode assembly is provided with a protruding structure protruding towards the elastic part, the sealing part is fixedly connected with the guiding part, and in a case where the air pressure in the first accommodating space is less than or equal to the second threshold value, a surface of the sealing part towards the electrode assembly abuts against a part of a surface of the second groove towards the second accommodating space.

[0024] In the embodiments of the present application, by setting the sealing assembly to comprise a sealing part and a guiding part, the guiding part is located on a side of the sealing part away from the electrode assembly, a surface of the guiding part away from the electrode assembly is provided with a protruding structure protruding towards the elastic part, the sealing part is fixedly connected with the guiding part, and in a case where the air pressure in the first accommodating space is less than or equal to the second threshold value, a surface of the sealing part towards the electrode assembly abuts against a part of a surface of the second groove towards the second accommodating space, the installation performance and the use performance of the valve assembly are effectively balanced, and thus the use performance of the battery monomer is improved.

[0025] In some embodiments, in a direction perpendicular to the thickness direction of the valve assembly, the maximum size D1 of the protruding structure and the maximum size D2 of the deformed part satisfy: 0mm≤D2-D1≤5mm.

[0026] In the embodiments of the present application, in a direction perpendicular to the thickness direction of the valve assembly, by setting the maximum size D1 of the protruding structure and the maximum size D2 of the deformed part to satisfy: 0mm≤D2-D1≤5mm, in a case where the air pressure in the first accommodating space is greater than or equal to the first threshold value, the protruding structure can move towards the elastic part, so that the deformed part of the elastic part protrudes towards the valve cover part, and the gas in the first accommodating space is discharged to the outside of the battery monomer through the second accommodating space in time, the installation performance and the use performance of the valve assembly are effectively balanced, and thus the use performance of the battery monomer is improved.

[0027] In some embodiments, the sealing part and the guiding part are connected by clamping or interference. In this way, in the embodiments of the present application, by setting the sealing part and the guiding part to be connected by clamping or interference, the connection strength between the sealing part and the guiding part and the use performance of the sealing assembly are balanced, and at the same time, the connection mode is simple, and the processing and manufacturing of the valve assembly are facilitated.

[0028] In some embodiments, the outer periphery of the side of the main body component distal to the electrode assembly is provided with a second extension, the second extension extending in a direction away from the center of the main body component, the surface of the second extension distal to the electrode assembly is provided with a third groove, the third groove is arranged around the outer periphery of the valve cover component in a plane perpendicular to the thickness direction of the valve assembly.

[0029] In the embodiments, the outer periphery of the side of the main body component distal to the electrode assembly is provided with a second extension, the second extension extending in a direction away from the center of the main body component, the surface of the second extension distal to the electrode assembly is provided with a third groove, the third groove is arranged around the outer periphery of the valve cover component in a plane perpendicular to the thickness direction of the valve assembly, so that when the valve assembly is installed on the first wall, the third groove arranged on the second extension can release the welding stress generated between the valve assembly and the first wall, so as to reduce the influence of the welding stress on the weld between the valve assembly and the first wall, reduce the risk of seal failure caused by weld cracking, and improve the use performance of the valve assembly.

[0030] In some embodiments, the surface of the second extension distal to the electrode assembly is provided with a plurality of third grooves, and the plurality of third grooves are arranged around the outer periphery of the valve cover component in a direction away from the center of the main body component in a plane perpendicular to the thickness direction of the valve assembly. In this way, in the embodiments, the surface of the second extension distal to the electrode assembly is provided with a plurality of third grooves, and the plurality of third grooves are arranged around the outer periphery of the valve cover component in a direction away from the center of the main body component in a plane perpendicular to the thickness direction of the valve assembly, which can effectively release the welding stress generated between the valve assembly and the first wall, so as to reduce the influence of the welding stress on the weld between the valve assembly and the first wall, reduce the risk of seal failure caused by weld cracking, and improve the use performance of the valve assembly.

[0031] In some embodiments, the surface of the second extension facing the electrode assembly is inclined towards the geometric center of the main body component, and the size of the second extension in the thickness direction of the valve assembly gradually decreases in a direction away from the geometric center of the main body component.

[0032] In the embodiments, the surface of the second extension facing the electrode assembly is inclined towards the geometric center of the main body component, and the size of the second extension in the thickness direction of the valve assembly gradually decreases in a direction away from the geometric center of the main body component, so as to facilitate the assembly between the valve assembly and the first wall, and the structure is simple, facilitating the processing and manufacturing of the valve assembly.

[0033] In some embodiments, the battery cell further comprises an insulation structure disposed on a first surface of the first wall facing the electrode assembly, the insulation structure being configured to wrap a portion of the valve assembly protruding from the first surface.

[0034] In the embodiments of the present application, by disposing the insulation structure on the first surface of the first wall facing the electrode assembly, and by configuring the insulation structure to wrap the portion of the valve assembly protruding from the first surface, the valve assembly and the electrode assembly are insulated and separated, the risk of short circuit of the battery cell caused by direct contact between the valve assembly and the electrode assembly is reduced, and the use performance of the battery cell is improved.

[0035] In some embodiments, the insulation structure is provided with a third through hole corresponding to the second through hole, the third through hole penetrating the insulation structure along the thickness direction of the first wall, and in the case that the gas pressure in the first accommodation space is greater than or equal to the first threshold value, the first accommodation space is in communication with the second accommodation space through the third through hole and the second through hole in sequence.

[0036] In the embodiments of the present application, by providing the insulation structure with the third through hole corresponding to the second through hole, and by configuring the third through hole to penetrate the insulation structure along the thickness direction of the first wall, in the case that the gas pressure in the first accommodation space is greater than or equal to the first threshold value, the gas in the first accommodation space enters the second accommodation space through the third through hole and the second through hole in sequence, and is discharged to the outside of the battery cell through the second accommodation space, so as to effectively balance the installation performance and use performance of the valve assembly, and thus the use performance of the battery cell is improved.

[0037] In some embodiments, the material of the sealing portion comprises at least one of the following materials: fluororubber, fluoroplastic, and ethylene-propylene-diene rubber. In this way, in the embodiments of the present application, by configuring the material of the sealing portion to comprise at least one of the following materials: fluororubber, fluoroplastic, and ethylene-propylene-diene rubber, the sealing performance between the sealing portion and the main component is improved, the use performance of the valve assembly is improved, and thus the use performance of the battery cell is improved.

[0038] In some embodiments, the housing comprises an end cover and a shell, the shell having an opening, the end cover being covered on the opening, and the first wall comprising at least a portion of the end cover. In this way, in the embodiments of the present application, by configuring the first wall to comprise at least a portion of the end cover, i.e. by configuring the valve assembly on the first wall on the end cover, the valve assembly is facilitated to be assembled, the processing and manufacturing of the battery cell are facilitated, and the use performance of the battery cell is improved.

[0039] In some embodiments, the material of the body component, the valve cover component and the end cover is the same. In this way, in the embodiments of the present application, by setting the material of the body component, the valve cover component and the end cover to be the same material, the processing and manufacturing of the battery cell are facilitated, and the production cost is reduced.

[0040] In some embodiments, the battery cell is a sodium-ion battery cell or a sodium-metal battery cell. In this way, in the embodiments of the present application, by setting the battery cell to be a sodium-ion battery cell or a sodium-metal battery cell, the use performance and manufacturing performance of the battery cell are improved.

[0041] In a second aspect, a battery device is provided, comprising: a plurality of battery cells, the battery cell being the battery cell in the first aspect or any of the implementation forms thereof.

[0042] In a third aspect, a power consumption device is provided, comprising the battery device in the second aspect, and the battery device is used to provide electric energy for the power consumption device.

[0043] In some implementation forms, the power consumption device can be a vehicle, a ship or a spacecraft, etc.

[0044] In a fourth aspect, an energy storage device is provided, comprising the battery device in the second aspect, and the battery device is used to store electric energy for the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0046] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application.

[0047] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application.

[0048] Figure 3 is a structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0049] Figure 4 is an exploded structural schematic diagram of a battery cell provided by another embodiment of the present application.

[0050] Figure 5 is a structural schematic diagram of a valve assembly provided by an embodiment of the present application.

[0051] Figure 6is a schematic diagram of an exploded structure of a valve assembly provided by an embodiment of the present application.

[0052] Figure 7 is a schematic diagram of a cross section of a housing provided by an embodiment of the present application.

[0053] Figure 8 is a schematic diagram of a cross section of a housing provided by another embodiment of the present application.

[0054] Figure 9 is a schematic diagram of a cross section of a housing provided by another embodiment of the present application.

[0055] Figure 10 is a schematic diagram of a cross section of a housing provided by another embodiment of the present application.

[0056] Figure 11 is a schematic diagram of a cross section of a housing provided by another embodiment of the present application.

[0057] Figure 12 is a schematic diagram of a cross section of a housing provided by another embodiment of the present application.

[0058] BRIEF DESCRIPTION OF DRAWINGS 1 - vehicle; 10 - battery device; 20 - battery cell; 30 - controller; 40 - motor; 111 - first part; 112 - second part; 112a - bottom plate; 112b - side plate; 21 - housing; 22 - electrode assembly; 210 - first accommodation space; 211 - casing; 212 - end cover; 213 - pressure relief mechanism; 222 - electrode tab; 222a - positive electrode tab; 222b - negative electrode tab; 214 - electrode terminal; 214a - positive electrode terminal; 214b - negative electrode terminal; 23 - connecting member; 215 - first wall; 2151 - first surface; 216 - through-hole structure; 50 - valve assembly; 510 - main body part; 511 - first recess; 512 - second recess; 513 - second through-hole; 514 - inner recess; 515 - second extension; 516 - third recess; 520 - valve cover part; 521 - first through-hole; 530 - elastic part; 531 - deformation part; 532 - first extension; 540 - sealing assembly; 541 - sealing part; 542 - guide part; 543 - protrusion structure; 544 - first protrusion; 545 - fourth recess; 60 - second accommodation space; 70 - insulation structure; 710 - third through-hole.

[0059] In the drawings, the drawings are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0061] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0063] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0064] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after it.

[0066] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0067] In the present application, "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0068] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0069] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0070] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0071] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0072] As an example, the positive electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, surface-treated metals, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only or in combination of two or more. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (may also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi1 / 3Co1 / 3Mn1 / 3O2 (may also be referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (may also be referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (may also be referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (may also be referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (may also be referred to as NCM811), lithium nickel cobalt aluminum oxide (e.g., LiNi0.8Co0.15Al0.05O2), and a modified compound thereof. The modified compound refers to a substance obtained by a modification method such as doping or coating on the basis of the above-mentioned substance.

[0074] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, etc. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, and of course, the positive electrode active material can be provided. As an example, the positive electrode active material is filled or / and deposited in the foam metal.

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0076] As an example, the negative current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0078] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0079] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone only one or in combination of two or more.

[0080] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative active material, and of course, can be provided with a negative active material.

[0081] As an example, the negative active material can be filled and / or deposited in the negative current collector.

[0082] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0083] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0084] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any known porous separator film having good chemical stability and mechanical stability can be used.

[0085] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0086] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0087] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0088] The liquid electrolyte includes an electrolyte salt and a solvent.

[0089] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium di-oxalate borate, lithium difluoro di-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0090] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0091] In some embodiments, the electrolyte solution can also optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / fast charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0092] The gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0093] The solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0094] As an example, the polymer of the polymer solid electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0095] As an example, the inorganic solid electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0096] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0097] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of the wound and stacked structures.

[0098] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0099] In some embodiments, the electrode assembly is a stacked structure.

[0100] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0101] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0102] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0103] As an example, a plurality of separators can be provided, and each of the plurality of separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0104] As an example, the separators can be continuously provided between any adjacent positive or negative electrode sheets by being folded or wound.

[0105] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0106] In some embodiments, the electrode assembly can be provided with tabs that can lead current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0107] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, the sealing bag being used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the housing is used to encapsulate the electrode assembly and the electrolyte, etc.

[0108] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell having another shape, and the prismatic battery cell can include a square battery cell, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), etc.

[0109] In some embodiments, the housing can be provided with at least one electrode terminal electrically connected to the tabs. The electrode terminal can be directly connected to the tabs or indirectly connected to the tabs through a current collecting member. The electrode terminal can be provided on an end cap or on the housing.

[0110] In some embodiments, the housing can be provided with a pressure relief mechanism. The pressure relief mechanism can be used to discharge internal gas of the battery cell.

[0111] As an example, the pressure relief mechanism can be actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage through which the internal pressure or temperature can be released. The threshold can be designed differently depending on design requirements. The threshold can depend on the material of one or more of the positive electrode sheets, the negative electrode sheets, the electrolyte, and the separators in the battery cell.

[0112] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0113] As an example, the pressure relief mechanism can also be provided separately from the housing and coupled to the housing.

[0114] As used herein, "actuation" of the pressure relief mechanism refers to the pressure relief mechanism being activated or moved to a state in which the internal pressure and temperature of the battery cell can be released. The actuation of the pressure relief mechanism can include, but is not limited to, movement of a component of the pressure relief mechanism to form a venting path, at least a portion of the pressure relief mechanism rupturing, breaking, tearing, or opening, etc. Upon actuation of the pressure relief mechanism, the high temperature and pressure material inside the battery cell can be released as an effluent from the actuated portion. In this manner, the battery cell can be vented and cooled in a controlled manner to avoid a potentially more severe accident.

[0115] In some embodiments, the housing is not a sealed structure, and the pressure relief mechanism can be provided as a through hole for releasing the gas inside the battery cell.

[0116] As used herein, the effluent from the battery cell can include, but is not limited to, electrolyte, dissolved or broken positive and negative electrode sheets, fragments of separators, high temperature and pressure gases generated by the reaction, flames, etc.

[0117] As used herein, the battery device can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar.

[0118] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0119] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a single module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0120] In some embodiments, the battery device can be a battery pack including a case and one or more battery cell assemblies received in the case.

[0121] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be received in the case by fixing the battery module in the case.

[0122] As an example, the battery cell assembly can also be received in the case by directly fixing a plurality of battery cells in the case.

[0123] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an inside of the box forms a closed space to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0124] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively so that an inside of the box forms a closed space to accommodate the battery cell assembly.

[0125] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, part of the box can be at least part of a floor of the vehicle, or part of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0126] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, such as aircraft, rockets, space shuttles and spacecraft.

[0127] The embodiments of the present application provide a storage device, which includes one or more battery clusters to improve the voltage and capacity of the storage device. The battery cluster can include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to improve the voltage of the storage device. When the storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the storage device.

[0128] The storage device can be used in a storage power station, a wind power system, a solar power system, a mobile power system or a temporary power supply system, etc. The storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the storage device can store electrical energy during the low electricity consumption period, and provide electrical energy for related users or electric devices during the peak electricity consumption period. The storage system provided by the embodiments of the present application can be any power system that needs to use a storage device.

[0129] In some embodiments, the storage device is a storage container or a storage cabinet.

[0130] In some embodiments, the storage device can include a cabinet and one or more battery clusters, and the battery clusters are accommodated in the cabinet.

[0131] In some embodiments, the storage device can include a thermal management module, a master control module, a general control module, a power distribution module and a fire-fighting module.

[0132] As an example, the thermal management module can include a liquid cooling unit, and the liquid cooling unit provides a cooling liquid for adjusting the temperature of the battery cell through a pipeline to each battery device.

[0133] As an example, the master module can be used as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, etc. of the battery cluster can be controlled. The master module includes auxiliary battery management units, fusion switches, and other modules.

[0134] As an example, the master module can be used as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, etc. of the battery cluster can be controlled. The master module includes auxiliary battery management units, fusion switches, and other modules.

[0135] As an example, the fire control system includes a control panel, a detector, an alarm device, etc. for detecting, alarming, or extinguishing the energy storage system.

[0136] As an example, the power distribution device can be used to distribute power to the energy storage device power module.

[0137] Currently, the development of battery device technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, and charge-discharge rate. In the development of battery device technology, in addition to improving the electrical performance of the battery device, safety is also an issue that cannot be ignored. In the field of battery technology, in order to improve the safety of the battery monomer, a pressure relief mechanism is usually provided on the shell of the battery monomer to release the pressure inside the battery monomer when the pressure or temperature inside the battery monomer reaches a threshold value. However, the current pressure relief mechanism may have the problem of premature actuation during use, which adversely affects the performance of the battery monomer and reduces the service life and reliability of the battery monomer. Therefore, how to timely discharge the gas inside the battery monomer to the outside of the battery monomer and reduce the risk of premature opening of the pressure relief mechanism to improve the performance of the battery monomer has become a technical problem that needs to be solved in the field.

[0138] Therefore, the battery monomer, the battery device, the power utilization device and the energy storage device are provided. The battery monomer comprises a shell, an electrode assembly and a valve assembly. The shell has a first accommodating space. The electrode assembly is accommodated in the first accommodating space. The valve assembly is arranged on a first wall of the shell. The valve assembly has a second accommodating space. The valve assembly comprises a main body component, a valve cover component, an elastic component and a sealing assembly. The main body component and the valve cover component enclose the second accommodating space. The elastic component and the sealing assembly are both accommodated in the second accommodating space. The elastic component is connected to the sealing assembly. When the gas pressure in the first accommodating space is greater than or equal to a first threshold A1, part of the elastic component protrudes towards the valve cover component. The gas in the first accommodating space is discharged to the outside of the battery monomer through the second accommodating space. When the gas pressure in the first accommodating space is less than or equal to a second threshold A2, part of the elastic component protrudes towards the electrode assembly. The first accommodating space is sealingly isolated from the second accommodating space. The first threshold A1 is greater than the second threshold A2. In this way, in the present application, the valve assembly is arranged on the first wall of the shell. The valve assembly comprises a main body component, a valve cover component, an elastic component and a sealing assembly. The main body component and the valve cover component enclose the second accommodating space. The elastic component and the sealing assembly are both accommodated in the second accommodating space. The elastic component is connected to the sealing assembly. When the gas pressure in the first accommodating space is greater than or equal to a first threshold A1, part of the elastic component protrudes towards the valve cover component. The gas in the first accommodating space is discharged to the outside of the battery monomer through the second accommodating space. Therefore, the valve assembly can timely discharge the gas in the battery monomer to the outside of the battery monomer, reducing the risk of premature opening of the pressure relief mechanism. When the gas pressure in the first accommodating space is less than or equal to a second threshold A2, part of the elastic component protrudes towards the electrode assembly, so as to realize the sealing isolation between the first accommodating space and the second accommodating space. Compared with the technical solution using a spring structure, the time for sealing isolation between the first accommodating space and the second accommodating space can be effectively reduced, so as to reduce the influence of water vapor or other impurities outside the battery monomer on the inside of the battery monomer, thereby improving the use performance of the battery monomer.

[0139] The technical solutions described in the present application are applicable to various power utilization devices using battery devices.

[0140] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0141] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0142] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0143] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0144] For example, such as Figure 2 The diagram shown is a structural schematic of a battery device 10 according to an embodiment of this application. The battery device 10 may include a plurality of battery cells 20. The battery device 10 may also include a housing 11 (or cover), the housing 11 having a hollow structure, and the plurality of battery cells 20 are housed within the housing 11. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed configuration and then placed within the housing 11.

[0145] like Figure 2 As shown, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The housing may include a bottom plate 112a, side plates 112b, and beams. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0146] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0147] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements.

[0148] In the embodiments of the present application, the number of battery monomers 20 can be set to any value according to different power requirements. The plurality of battery monomers 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery monomers 20 included in each battery device 10 can be large, in order to facilitate installation, the battery monomers 20 can be arranged in groups, and each group of battery monomers 20 forms a battery module. The number of battery monomers 20 included in the battery module is not limited and can be set according to requirements. The battery device 10 can include a plurality of battery modules, and the battery modules can be connected in series, parallel or mixed connection.

[0149] Figure 3 A structural schematic diagram of the battery monomer 20 provided by an embodiment of the present application is shown, Figure 4 An exploded structural schematic diagram of the battery monomer 20 provided by another embodiment of the present application is shown. As Figure 3 and Figure 4 shown, the battery monomer 20 of the embodiment of the present application can include a shell 21 having a closed containing space and an electrode assembly 22 placed in the containing space in the shell 21. The shell 21 can include a shell body 211 which is a hollow structure having at least one opening, and an end cover 212 for mutually buckling with the shell body 211 to form the shell 21 having a closed containing space.

[0150] It should be understood that the battery monomer 20 in the embodiments of the present application can be a secondary battery, which refers to a battery monomer 20 that can be activated by charging after discharging to continue to be used. Exemplarily, the battery monomer 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0151] The electrode assembly 22 in the embodiments of the present application includes a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery monomer 20, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through.

[0152] In some embodiments, the end cover 212 can be a plate-shaped structure for covering the opening of the shell body 211. In other embodiments, the end cover 212 has a similar structure to the shell body 211, i.e. the shell body 211 and the end cover 212 are both hollow structures having one opening, and the two openings are butted to form the shell 21 having a closed containing space.

[0153] It should be understood that if the end cover 212 is a plate structure, the shell 211 can be a hollow structure with one or more ends open. For example, if the shell 211 is a hollow structure with one end open, the end cover 212 can be provided as one; if the shell 211 is a hollow structure with two opposite ends open, the end cover 212 can be provided as two, and the two end covers 212 are respectively covered on the openings of the two ends of the shell 211.

[0154] The shell 21 can be various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, as shown in Figure 3 and Figure 4 In the embodiment of the present application, the shell 21 is mainly described as a cuboid structure.

[0155] It should be understood that the end cover 212 of the present application is used to cooperate with the shell 211 to isolate the internal environment of the battery monomer 20 from the external environment. The shape of the end cover 212 can be adapted to the shape of the shell 211, such as Figure 3 and Figure 4 As shown in the shell 211 is a cuboid structure, and the end cover 212 is a rectangular plate structure adapted to the shell 211.

[0156] The material of the shell 211 of the present application can include one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 212 can also be one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. Among them, the material of the end cover 212 and the material of the shell 211 can be the same or different; the materials of the different walls of the shell 211 can also be the same or different.

[0157] The end cover 212 of the present application can be any wall of the shell 21, for example, the end cover 212 can be the largest wall among the multiple walls included in the shell 21, or the smallest wall, or other walls, which are not limited by the present application. Alternatively, the end cover 212 can also be other structures, for example, the end cover 212 can also be a groove structure with an opening, to cover the opening of the shell 211 with the opening of the end cover 212, which is not limited by the present application.

[0158] It should be understood that the battery monomer 20 also includes an electrode terminal 214. The electrode terminal 214 of the present application is used to electrically connect with the electrode assembly 22 inside the battery monomer 20 to output the electric energy of the battery monomer 20. As shown in Figure 3 to Figure 4As shown, the battery cell 20 can include at least two electrode terminals 214, which can include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b, the positive electrode terminal 214a being configured to be electrically connected to the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b being configured to be electrically connected to the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a can be directly connected to the positive electrode tab 222a, or can be indirectly connected to the positive electrode tab 222a, and the negative electrode terminal 214b can be directly connected to the negative electrode tab 222b, or can be indirectly connected to the negative electrode tab 222b. For example, the positive electrode terminal 214a can be electrically connected to the positive electrode tab 222a through a connecting member 23, and the negative electrode terminal 214b can be electrically connected to the negative electrode tab 222b through a connecting member 23. It should be understood that, in the embodiments of the present application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as a tab 222.

[0159] In the embodiments of the present application, the walls of the shell 211 and the walls of the end cover 212 are collectively referred to as the walls of the battery cell 20, wherein the walls of the shell 211 include a bottom wall and four side walls for the cuboid-shaped battery cell 20 shown in FIGS. 1 to 3. Figure 3 and Figure 4 For the cuboid-shaped battery cell 20 shown in FIGS. 1 to 3, the walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the combined one or more electrode assemblies 22. For example, the shell 211 can be a hollow cuboid or a hollow square or a hollow cylinder, and one of the faces of the shell 211 has an opening so that the one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a hollow square, one of the planes of the shell 211 is an opening plane, i.e., the plane does not have a wall so that the inside and outside of the shell 211 are in communication. When the shell 211 can be a hollow cylinder, the end face of the shell 211 is an opening plane, i.e., the end face does not have a wall so that the inside and outside of the shell 211 are in communication. The end cover 212 covers the opening and is connected to the shell 211 to form a closed cavity in which the electrode assembly 22 is placed. The shell 211 is filled with an electrolyte, such as an electrolyte solution.

[0160] In the battery cell 20, the electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20. According to actual use requirements, the electrode assembly 22 in the shell 211 can be one or multiple. For example, as shown in FIGS. 1 to 3, two electrode assemblies 22 are provided in the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the shell 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the shell 211 can also be a cuboid structure. Figure 4

[0161] ​In the battery cell 20, the electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20, and the electrode assembly 22 in the shell 211 can be one or multiple according to actual use requirements. For example, as shown in Figure 4 two electrode assemblies 22 are arranged in the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylinder structure, the shell 211 can also be a cylinder structure, and if the electrode assembly 22 is a cuboid structure, the shell 211 can also be a cuboid structure. In the embodiment of the present application, the material of the shell 211 can include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0162] The battery cell 20 can also be provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0163] The pressure relief mechanism 213 can be various possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism configured to be able to break when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0164] It should be understood that, as shown in Figure 3 and Figure 4 , the end cover 212 of the battery cell 20 is also provided with a valve assembly 50. In the case that the air pressure inside the battery cell 20 is large and has not yet reached the pressure threshold value for opening the pressure relief mechanism 213, the valve assembly 50 is used to discharge the gas inside the battery cell 20 to the outside of the battery cell 20, so as to reduce the risk of premature opening of the pressure relief mechanism 213. Specifically, the specific structure of the valve assembly 50 is described in detail below in conjunction with specific drawings.

[0165] Figure 5 The structure schematic diagram of the valve assembly 50 provided by an embodiment of the present application is shown. Figure 6 The exploded structure schematic diagram of the valve assembly 50 provided by an embodiment of the present application is shown. Figure 7 The cross-sectional schematic diagram of the shell 21 provided by an embodiment of the present application is shown. Figure 8 The cross-sectional schematic diagram of the shell 21 provided by another embodiment of the present application is shown. For example, Figure 6 may be Figure 5 the exploded structure schematic diagram of the valve assembly 50 shown in

[0166] In some implementations, as Figure 5 to Figure 8As shown, the battery cell 20 includes a housing 21, an electrode assembly 22, and a valve assembly 50. The housing 21 has a first accommodation space 210, and the electrode assembly 22 is accommodated in the first accommodation space 210. The valve assembly 50 is disposed on a first wall 215 of the housing 21, and has a second accommodation space 60. The valve assembly 50 includes a main body part 510, a valve cover part 520, an elastic part 530, and a sealing assembly 540. The main body part 510 and the valve cover part 520 enclose the second accommodation space 60. The elastic part 530 and the sealing assembly 540 are both accommodated in the second accommodation space 60. The elastic part 530 is connected to the sealing assembly 540. When the gas pressure in the first accommodation space 210 is greater than or equal to a first threshold value A1, a portion of the elastic part 530 protrudes toward the valve cover part 520, and the gas in the first accommodation space 210 is discharged to the outside of the battery cell 20 through the second accommodation space 60. When the gas pressure in the first accommodation space 210 is less than or equal to a second threshold value A2, a portion of the elastic part 530 protrudes toward the electrode assembly 22, and the first accommodation space 210 is sealed and isolated from the second accommodation space 60. The first threshold value A1 is greater than the second threshold value A2.

[0167] It should be understood that the housing 21 in the embodiments of the present application can refer to a shell 211 of the battery cell 20 or an end cover 212 used to cover an opening at one end of the shell 211. Exemplarily, the valve assembly 50 in the embodiments of the present application can be disposed on the shell 211 or on the end cover 212. It should also be understood that, when the housing 21 is the shell 211 of the battery cell 20, the first wall 215 can be a wall with the largest area or a wall with the smallest area of the shell 211.

[0168] It should also be understood that the first accommodation space 210 is used to accommodate the electrode assembly 22 and the electrolyte, and the second accommodation space 60 is used to accommodate the valve cover part 520, the elastic part 530, and the sealing assembly 540. When the valve assembly 50 is in an open state, the first accommodation space 210 and the second accommodation space 60 are in communication, and the second accommodation space 60 can be in communication with the outside of the battery cell 20, so that the gas in the first accommodation space 210 of the battery cell 20 is discharged to the outside of the battery cell 20 through the second accommodation space 60. When the valve assembly 50 is in a closed state, the first accommodation space 210 and the second accommodation space 60 are sealed and isolated.

[0169] It should also be understood that the first threshold value A1 and the second threshold value A2 in the embodiments of the present application can be set according to relevant parameters such as the specific structure and material of the valve assembly 50. For example, the first threshold value A1 and the second threshold value A2 can be determined according to the structure and material of the elastic component 530 and the sealing assembly 540 in the valve assembly 50. It should also be understood that the first threshold value A1 is greater than the second threshold value A2, and the first threshold value A1 is less than the threshold value of the gas pressure at which the pressure relief mechanism 213 in the battery monomer 20 is actuated to open.

[0170] It should also be understood that the elastic component 530 in the embodiments of the present application refers to an elastic component 530 capable of producing sufficient elastic deformation under force. Under the action of external force, the elastic component 530 will produce elastic deformation, and in the case of removal of external force, the elastic component 530 will return to its original state. That is, the elastic component 530 will store a certain amount of elastic potential energy in the deformed state, which will be converted into restoring force after the external force is removed to push the elastic component to return to the original state.

[0171] For example, when the gas pressure in the first containing space 210 of the battery monomer 20 is less than or equal to the second threshold value A2, the elastic component 530 can be in the original state or the first state, that is, part of the elastic component 530 protrudes towards the electrode assembly 22, and in this case, the first containing space 210 and the second containing space 60 are sealed and isolated. When the gas pressure in the first containing space 210 is greater than or equal to the first threshold value A1, the elastic component 530 reaches the deformation threshold value and produces elastic deformation, and the elastic component 530 can be in a deformed state or a second state, that is, part of the elastic component 530 protrudes towards the valve cover component 520, so that the gas in the first containing space 210 is discharged to the outside of the battery monomer 20 through the second containing space 60. Subsequently, when the gas pressure in the first containing space 210 of the battery monomer 20 decreases to the second threshold value A2, the elastic component 530 deforms to the first state, that is, part of the elastic component 530 protrudes towards the electrode assembly 22, and in this case, the first containing space 210 and the second containing space 60 are sealed and isolated.

[0172] It should also be understood that the first threshold value A1 and the second threshold value A2 in the embodiments of the present application can refer to the difference between the gas pressure in the first containing space 210 inside the battery monomer 20 and the current atmospheric pressure. For example, the atmospheric pressure at the current location of the battery monomer 20 can be the standard atmospheric pressure at the location, or the atmospheric pressure at the current location of the battery monomer 20 can be set according to the altitude of the location where the battery monomer 20 is located.

[0173] It should also be understood that in the embodiments of the present application, in some implementations, the first threshold value A1 can be set to 0.5 MPa≤A1≤0.7 MPa. Exemplarily, the first threshold value A1 can be set to 0.51 MPa, 0.54 MPa, 0.56 MPa, 0.58 MPa, 0.6 MPa, 0.62 MPa, 0.64 MPa, 0.66 MPa, 0.68 MPa, 0.7 MPa, or the like, or a value within a range obtained by any two of the above-mentioned values. It should also be understood that in the embodiments of the present application, in some implementations, the second threshold value A2 can be set to 0.1 MPa≤A2≤0.2 MPa. Exemplarily, the second threshold value A2 can be set to 0.11 MPa, 0.12 MPa, 0.13 MPa, 0.14 MPa, 0.15 MPa, 0.16 MPa, 0.17 MPa, 0.18 MPa, 0.19 MPa, 0.2 MPa, or the like, or a value within a range obtained by any two of the above-mentioned values.

[0174] It should also be understood that the shape of the elastic component 530 can be set according to actual needs. Exemplarily, in a plane perpendicular to the thickness direction of the elastic component 530, the shape of the elastic component 530 can be circular, directional, polygonal, or the like.

[0175] It should also be understood that when the air pressure in the first containing space 210 is greater than or equal to the first threshold value A1, the gas in the first containing space 210 can sequentially push the sealing component 540 and the elastic component 530 in the valve assembly 50 to realize the communication between the first containing space 210 and the second containing space 60, and discharge the gas to the outside of the battery monomer 20 through the second containing space 60. When the air pressure in the first containing space 210 is less than or equal to the second threshold value A2, the elastic component 530 returns to the first state described above, i.e., part of the elastic component 530 protrudes towards the electrode assembly 22 to drive the sealing component 540 to move towards the electrode assembly 22, and realize the sealing isolation between the first containing space 210 and the second containing space 60.

[0176] It should also be understood that the elastic component 530 is connected to the sealing assembly 540, and specifically, the elastic component 530 can be fixedly connected or attached to the sealing assembly 540. For example, during the manufacturing of the valve assembly 50, the main body component 510 in the valve assembly 50 can be formed by stamping, and the sealing assembly 540 is placed inside the main body component 510, and then the valve cover component 520 is fixedly connected to the elastic component 530, and the valve cover component 520 is placed inside the main body component 510 and fixedly connected to the main body component 510. It should also be understood that the first wall 215 can be provided with a through-hole structure 216, and at least part of the valve assembly 50 is accommodated in the through-hole structure 216.

[0177] In the embodiments of the present application, by providing the valve assembly 50 on the first wall 215 of the shell 21, the valve assembly 50 includes the main body component 510, the valve cover component 520, the elastic component 530, and the sealing assembly 540, and the main body component 510 and the valve cover component 520 enclose the second accommodation space 60, the elastic component 530 and the sealing assembly 540 are both accommodated in the second accommodation space 60, and the elastic component 530 is connected to the sealing assembly 540. The elastic component 530 is configured to: in the case that the air pressure in the first accommodation space 210 is greater than or equal to the first threshold A1, part of the elastic component 530 protrudes towards the valve cover component 520, and the gas in the first accommodation space 210 is discharged to the outside of the battery monomer 20 through the second accommodation space 60, so that the valve assembly 50 can timely discharge the gas inside the battery monomer 20 to the outside of the battery monomer 20, reducing the risk of the pressure relief mechanism 213 being opened prematurely, and in the case that the air pressure in the first accommodation space 210 is less than or equal to the second threshold A2, part of the elastic component 530 protrudes towards the electrode assembly 22, to realize the sealed isolation between the first accommodation space 210 and the second accommodation space 60. Compared with the technical solution of using a spring structure in the valve assembly 50, the time for sealing and isolating between the first accommodation space 210 and the second accommodation space 60 can be reduced, so as to reduce the influence of water vapor or other impurities outside the battery monomer 20 on the inside of the battery monomer 20, thereby improving the use performance of the battery monomer 20.

[0178] In some implementations, the difference between the first threshold A1 and the second threshold A2 satisfies: 0.1 MPa≤A1-A2≤0.3 MPa.

[0179] Exemplarily, the difference between the first threshold value A1 and the second threshold value A2 can be set to 0.1 MPa, 0.12 MPa, 0.14 MPa, 0.16 MPa, 0.18 MPa, 0.2 MPa, 0.22 MPa, 0.24 MPa, 0.26 MPa, 0.28 MPa, 0.3 MPa, or the like, or a value within a range obtained by any two of the above values.

[0180] In the embodiments of the present application, by setting the difference between the first threshold value A1 and the second threshold value A2 to satisfy 0.1 MPa≤A1-A2≤0.3 MPa, in the case that the air pressure in the first containing space 210 is greater than or equal to the first threshold value A1, the gas in the first containing space 210 is discharged to the outside of the battery monomer 20 through the second containing space 60, the valve assembly 50 can timely discharge the gas inside the battery monomer 20 to the outside of the battery monomer 20, reducing the risk of the pressure relief mechanism 213 opening in advance, and in the case that the air pressure in the first containing space 210 is less than or equal to the second threshold value A2, the sealing and isolation between the first containing space 210 and the second containing space 60 is achieved, reducing the influence of water vapor or other impurities outside the battery monomer 20 on the inside of the battery monomer 20, thereby improving the use performance of the battery monomer 20.

[0181] In some implementations, the difference between the first threshold value A1 and the second threshold value A2 can also satisfy 0.15 MPa≤A1-A2≤0.3 MPa.

[0182] In some implementations, the difference between the first threshold value A1 and the second threshold value A2 can also satisfy 0.2 MPa≤A1-A2≤0.3 MPa.

[0183] Exemplarily, the difference between the first threshold value A1 and the second threshold value A2 can be set to 0.2 MPa, 0.21 MPa, 0.22 MPa, 0.23 MPa, 0.24 MPa, 0.25 MPa, 0.26 MPa, 0.27 MPa, 0.28 MPa, 0.29 MPa, 0.3 MPa, or the like, or a value within a range obtained by any two of the above values.

[0184] In the embodiment of the present application, by setting the difference between the first threshold value A1 and the second threshold value A2 to satisfy 0.2 MPa≤A1-A2≤0.3 MPa, in the case that the gas pressure in the first containing space 210 is greater than or equal to the first threshold value A1, the gas in the first containing space 210 is discharged to the outside of the battery monomer 20 through the second containing space 60, the valve assembly 50 can timely discharge the gas inside the battery monomer 20 to the outside of the battery monomer 20, reducing the risk of the pressure relief mechanism 213 opening in advance, and in the case that the gas pressure in the first containing space 210 is less than or equal to the second threshold value A2, the sealing and isolation between the first containing space 210 and the second containing space 60 is achieved, effectively reducing the influence of water vapor or other impurities outside the battery monomer 20 on the inside of the battery monomer 20, thereby improving the use performance of the battery monomer 20.

[0185] In some implementations, as shown in FIG. 5, the elastic component 530 includes a deformed portion 531 and a first extension portion 532 connected to the outer periphery of the deformed portion 531 and extending away from the geometric center of the elastic component 530. The surface of the first extension portion 532 on the side facing the valve cover component 520 is fixedly connected to the surface of the valve cover component 520 on the side facing the elastic component 530. In the case that the gas pressure in the first containing space 210 is greater than or equal to the first threshold value, the deformed portion 531 protrudes towards the valve cover component 520. In the case that the gas pressure in the first containing space 210 is less than or equal to the second threshold value, the deformed portion 531 protrudes towards the electrode assembly 22. Figure 6 to Figure 8

[0186] It should be understood that the deformed portion 531 and the first extension portion 532 of the elastic component 530 in the embodiment of the present application can be integrally formed or separately formed. In the case that the deformed portion 531 and the first extension portion 532 are integrally formed, the deformed portion 531 and the first extension portion 532 can be integrally injection molded. In the case that the deformed portion 531 and the first extension portion 532 are separately formed, the deformed portion 531 and the first extension portion 532 can be connected by welding.

[0187] It should also be understood that the material of the elastic component 530 can be set according to actual needs. For example, the material of the elastic component 530 can be steel material, alloy material, or plastic, etc. For another example, in the case that the deformed portion 531 and the first extension portion 532 are separately formed, the deformed portion 531 and the first extension portion 532 can be the same or different.

[0188] ​It should also be understood that, in the embodiments of the present application, the projection of the valve cover component 520 covers the projection of the elastic component 530 in a plane perpendicular to the thickness direction of the valve assembly 50, so as to facilitate the connection and assembly between the valve cover component 520 and the elastic component 530.

[0189] In the embodiments of the present application, by setting the elastic component 530 to include the deformation portion 531 and the first extension portion 532, and in the case where the air pressure in the first accommodation space 210 is greater than or equal to the first threshold value, the deformation portion 531 protrudes towards the valve cover component 520; in the case where the air pressure in the first accommodation space 210 is less than or equal to the second threshold value, the deformation portion 531 protrudes towards the electrode assembly 22, and at the same time, the gas inside the battery monomer 20 is discharged to the outside of the battery monomer 20, reducing the risk of premature opening of the pressure relief mechanism 213, improving the use performance of the battery monomer 20, and at the same time, the structure is simple, facilitating the processing and manufacturing of the valve assembly 50.

[0190] In some implementations, as shown in Figure 7 and Figure 8 In the thickness direction of the valve assembly 50, the maximum deformation amount L0 of the deformation portion 531 is less than the maximum size L1 between the surface of the valve cover component 520 facing the electrode assembly 22 and the surface of the sealing assembly 540 facing away from the electrode assembly 22.

[0191] It should be understood that, as shown in Figure 7 the maximum deformation amount L0 / 2 in the case where the elastic component 530 protrudes towards the valve cover component 520, Figure 8 the maximum deformation amount L0 / 2 in the case where the elastic component 530 protrudes towards the electrode assembly 22, i.e., the maximum deformation amount of the elastic component 530 in the embodiments of the present application can be L0.

[0192] It should also be understood that, in the embodiments of the present application, the maximum size L1 between the surface of the valve cover component 520 facing the electrode assembly 22 and the surface of the sealing assembly 540 facing away from the electrode assembly 22 can refer to the distance between the surface of the valve cover component 520 facing the electrode assembly 22 and the surface of the sealing assembly 540 facing away from the electrode assembly 22 in the thickness direction of the valve assembly 50 in the case where the air pressure in the first accommodation space 210 is less than or equal to the second threshold value.

[0193] In the embodiment of the present application, in the thickness direction of the valve assembly 50, by setting the maximum deformation amount L0 of the deformation portion 531 to be less than the maximum dimension L1 between the surface of the valve cover member 520 facing the electrode assembly 22 and the surface of the sealing assembly 540 facing away from the electrode assembly 22, sufficient deformation space is provided for the elastic member 530 to improve the installation performance and use performance of the elastic member 530.

[0194] In some implementations, as shown in Figure 5 to Figure 8 The valve cover member 520 is provided with a first through hole 521 extending through the valve cover member 520 in the thickness direction of the valve assembly 50, and the projection of the deformation portion 531 covers the projection of the first through hole 521 in the plane perpendicular to the thickness direction of the valve assembly 50.

[0195] It should be understood that the shape of the first through hole 521 provided in the valve cover member 520 in the embodiment of the present application can be set according to actual needs. For example, in the plane perpendicular to the thickness direction of the valve cover member 520, the shape of the first through hole 521 can be set to be circular, directional or polygonal, etc. It should also be understood that the number of first through holes 521 on the valve cover member 520 can be set according to actual needs, for example, one or more, to ensure the deformation performance of the elastic member 530.

[0196] In the embodiment of the present application, in the plane perpendicular to the thickness direction of the valve assembly 50, by covering the projection of the first through hole 521 with the projection of the deformation portion 531, in the case where the air pressure in the first accommodation space 210 is greater than or equal to the first threshold value, the deformation portion 531 can protrude towards the valve cover member 520, and in the case where the air pressure in the first accommodation space 210 is less than or equal to the second threshold value, the deformation portion 531 can protrude towards the electrode assembly 22, to improve the deformation performance of the elastic member 530, thereby improving the use performance of the valve assembly 50.

[0197] In some implementations, at least part of the surface of the first extension portion 532 on the side facing the valve cover member 520 is welded to part of the surface of the valve cover member 520 on the side facing the elastic member 530. In this way, in the embodiment of the present application, by welding at least part of the surface of the first extension portion 532 on the side facing the valve cover member 520 to part of the surface of the valve cover member 520 on the side facing the elastic member 530, the connection strength between the elastic member 530 and the valve cover member 520 is improved, and at the same time, the connection method is simple, facilitating the processing and manufacturing of the valve assembly 50.

[0198] In some implementations, as shown in Figure 7 and Figure 8As shown, the main body component 510 includes a first recess 511 and a second recess 512 in a stepped distribution, one end of the first recess 511 is formed on the surface of the main body component 510 away from the electrode assembly 22, the second recess 512 is located on the side of the first recess 511 towards the electrode assembly 22, the openings of the first recess 511 and the second recess 512 are both away from the electrode assembly 22, wherein at least part of the valve cover component 520 is accommodated in the first recess 511, and at least part of the sealing assembly 540 is accommodated in the second recess 512.

[0199] It should be understood that the size and shape of the first recess 511 and the second recess 512 in the plane perpendicular to the thickness direction of the valve assembly 50 can be set according to actual needs. For example, in order to facilitate the processing and manufacturing of the main body component 510 of the valve assembly 50, the bottom wall of the first recess 511 covers the bottom wall of the second recess 512 in the plane perpendicular to the thickness direction of the valve assembly 50.

[0200] It should also be understood that during the assembly of the valve assembly 50, the sealing assembly 540 can be placed on the bottom wall of the second recess 512 of the main body component 510 first, and then the valve cover component 520 and the elastic component 530 fixedly connected are placed on the bottom wall of the first recess 511, and the side wall of the valve cover component 520 can be fixedly connected with part of the side wall of the first recess 511.

[0201] In the embodiments of the present application, by setting the main body component 510 to include a first recess 511 and a second recess 512 in a stepped distribution, one end of the first recess 511 is formed on the surface of the main body component 510 away from the electrode assembly 22, the second recess 512 is located on the side of the first recess 511 towards the electrode assembly 22, at least part of the valve cover component 520 is accommodated in the first recess 511, and at least part of the sealing assembly 540 is accommodated in the second recess 512, so as to facilitate the installation of the valve cover component 520 and the sealing assembly 540 inside the main body component 510, thereby facilitating the processing and manufacturing of the valve assembly 50.

[0202] In some implementations, as shown in Figure 7 and Figure 8 As shown, the bottom wall of the second recess 512 is provided with a second through hole 513, the second through hole 513 communicates the first accommodation space 210 and the second accommodation space 60 when the gas pressure in the first accommodation space 210 is greater than or equal to a first threshold value, and the projection of the sealing assembly 540 covers the projection of the second through hole 513 in the plane perpendicular to the thickness direction of the valve assembly 50.

[0203] It should be understood that the shape of the second through hole 513 provided on the bottom wall of the second groove 512 in the embodiments of the present application can be set according to actual needs. For example, in a plane perpendicular to the thickness direction of the valve assembly 50, the shape of the second through hole 513 can be set as a circle, a rectangle, or a polygon, etc.

[0204] It should also be understood that in a plane perpendicular to the thickness direction of the valve assembly 50, the projection of the sealing assembly 540 covers the projection of the second through hole 513, so that the sealing assembly 540 achieves the sealing isolation between the first containing space 210 and the second containing space 60 when the air pressure in the first containing space 210 is less than or equal to the second threshold value. Secondly, when the air pressure in the first containing space 210 is greater than or equal to the first threshold value, the second through hole 513 connects the first containing space 210 and the second containing space 60, that is, the gas in the first containing space 210 can enter the second containing space 60 through the second through hole 513 and the gap between the sealing assembly 540 and the second groove 512, and then be discharged to the outside of the battery monomer 20 through the second containing space 60.

[0205] In the embodiments of the present application, by providing the second through hole 513 on the bottom wall of the second groove 512, and when the air pressure in the first containing space 210 is greater than or equal to the first threshold value, the second through hole 513 connects the first containing space 210 and the second containing space 60, so as to timely discharge the gas inside the battery monomer 20 to the outside of the battery monomer 20, thereby reducing the risk of premature opening of the pressure relief mechanism 213, and at the same time, in a plane perpendicular to the thickness direction of the valve assembly 50, by covering the projection of the second through hole 513 with the projection of the sealing assembly 540, when the air pressure in the first containing space 210 is less than or equal to the second threshold value, the sealing assembly 540 seals the second through hole 513 to achieve the sealing isolation between the first containing space 210 and the second containing space 60, thereby improving the use performance of the valve assembly 50.

[0206] In some implementations, as shown in Figure 7 and Figure 8 The ratio r1 / r2 between the inner diameter r1 of the second through hole 513 and the maximum dimension r2 of the sealing assembly 540 in the thickness direction of the valve assembly 50 satisfies: 0.5≤r1 / r2≤0.8.

[0207] For example, the ratio r1 / r2 between the inner diameter r1 of the second through hole 513 and the maximum dimension r2 of the sealing assembly 540 in the thickness direction of the valve assembly 50 can be set as: 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc., or a value within the range obtained by any two of the above combinations.

[0208] In the embodiment of the present application, the relationship between the inner diameter r1 of the second through hole 513 and the maximum dimension r2 of the sealing assembly 540 in the thickness direction perpendicular to the valve assembly 50 is set to satisfy 0.5≤r1 / r2≤0.8, so as to balance the use performance and installation performance of the valve assembly 50, thereby improving the use performance of the battery monomer 20.

[0209] In some implementations, as shown in Figure 5 to Figure 8 The surface of the first groove 511 facing the second accommodating space 60 is provided with an inner recess 514, and the inner recess 514 communicates the second accommodating space 60 and the outside of the battery monomer 20.

[0210] It should be understood that the shape and number of the inner recess 514 provided on the first groove 511 in the embodiment of the present application can be set according to actual needs to realize the communication between the second accommodating space 60 and the outside of the battery monomer 20, that is, in the case that the gas pressure in the first accommodating space 210 is greater than or equal to the first threshold value, the gas in the first accommodating space 210 can be sequentially discharged to the outside of the battery monomer 20 through the second accommodating space 60 and the inner recess 514.

[0211] It should also be understood that in the case that the gas pressure in the first accommodating space 210 is greater than or equal to the first threshold value, the inside of the valve assembly 50 can form an exhaust passage, and the gas generated in the first accommodating space 210 can be sequentially discharged to the outside of the battery monomer 20 through the second through hole 513, the gap between the sealing assembly 540 and the bottom wall of the second groove 512, the gap between the sealing assembly 540 and the side wall of the second groove 512, and the inner recess 514.

[0212] In the embodiment of the present application, the surface of the first groove 511 of the main body component 510 facing the second accommodating space 60 is provided with an inner recess 514, and the inner recess 514 communicates the second accommodating space 60 and the outside of the battery monomer 20, so as to facilitate the discharge of the gas inside the battery monomer 20 to the outside of the battery monomer 20, and reduce the risk of premature opening of the pressure relief mechanism 213, and at the same time, the structure is simple, facilitating the processing and manufacturing of the valve assembly 50.

[0213] In some implementations, the valve cover component 520 is welded to the side wall of the first groove 511 except the inner recess 514. In this way, in the embodiment of the present application, by welding the valve cover component 520 to the side wall of the first groove 511 except the inner recess 514, the connection strength between the valve cover component 520 and the main body component 510 and the use performance of the valve assembly 50 can be effectively balanced, and at the same time, the connection mode is simple, facilitating the processing and manufacturing of the valve assembly 50.

[0214] In some implementations, as shown in FIG. 5, the sealing assembly 540 includes a sealing portion 541 and a guiding portion 542 located on a side of the sealing portion 541 away from the electrode assembly 22, a surface of the guiding portion 542 away from the electrode assembly 22 is provided with a protruding structure 543 protruding towards the elastic member 530, and the sealing portion 541 is fixedly connected with the guiding portion 542. In a case where the gas pressure in the first accommodating space 210 is less than or equal to the second threshold value, a surface of the sealing portion 541 facing the electrode assembly 22 is in abutment with a part of the surface of the second groove 512 facing the second accommodating space 60. Figure 6 to Figure 8 It should be understood that, in a case where the gas pressure in the first accommodating space 210 is less than or equal to the second threshold value, the sealing portion 541 in the sealing assembly 540 is used to be in abutment with the part of the surface of the second groove 512 facing the second accommodating space 60, so as to achieve the sealed isolation between the first accommodating space 210 and the second accommodating space 60. In a case where the gas pressure in the first accommodating space 210 is greater than or equal to the first threshold value, a gap is formed between the sealing portion 541 and the part of the surface of the second groove 512 facing the second accommodating space 60, so that the first accommodating space 210 and the second accommodating space 60 are in communication, i.e., the gas generated in the first accommodating space 210 can enter the second accommodating space 60 through the second through hole 513 and the gap between the second groove 512 and the sealing portion 541, and be discharged to the outside of the battery cell 20 through the second accommodating space 60.

[0215] It should also be understood that, in a case where the gas pressure in the first accommodating space 210 is greater than or equal to the first threshold value, the guiding portion 542 in the sealing assembly 540 is used to move towards the direction of the elastic member 530, so as to push the elastic member 530 to generate elastic deformation. In a case where the gas pressure in the first accommodating space 210 is less than or equal to the second threshold value, the elastic member 530 returns to the initial state and is in contact with the guiding portion 542, so that the sealing assembly 540 moves towards the direction of the electrode assembly 22, so as to achieve the sealed isolation between the first accommodating space 210 and the second accommodating space 60.

[0216] It should also be understood that the sealing portion 541 and the guiding portion 542 can be formed in separate parts, and the sealing portion 541 and the guiding portion 542 can be connected by clamping, interference or bonding. It should also be understood that the shapes of the sealing portion 541 and the guiding portion 542 can be set according to actual needs.

[0217]

[0218] ​In the embodiment of the present application, by setting the sealing assembly 540 to include a sealing portion 541 and a guiding portion 542, and the guiding portion 542 is located on the side of the sealing portion 541 away from the electrode assembly 22, the surface of the guiding portion 542 away from the electrode assembly 22 is provided with a protruding structure 543 protruding towards the elastic member 530, and the sealing portion 541 is fixedly connected with the guiding portion 542, in the case that the gas pressure in the first containing space 210 is less than or equal to the second threshold value, the surface of the sealing portion 541 towards the electrode assembly 22 abuts against the part of the surface of the second groove 512 towards the second containing space 60, so as to effectively balance the installation performance and use performance of the valve assembly 50, thereby improving the use performance of the battery monomer 20.

[0219] In some implementations, as shown in Figure 7 and Figure 8 The maximum size D1 of the protruding structure 543 and the maximum size D2 of the deformed portion 531 satisfy: 0mm≤D2-D1≤5mm.

[0220] Exemplarily, the difference D2-D1 between the maximum size D1 of the protruding structure 543 and the maximum size D2 of the deformed portion 531 can be set to: 0mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 3mm, 4mm, 5mm, etc., or the value is within the range obtained by any two of the above combinations.

[0221] In the embodiment of the present application, in the direction perpendicular to the thickness direction of the valve assembly 50, by setting the maximum size D1 of the protruding structure 543 and the maximum size D2 of the deformed portion 531 to satisfy: 0mm≤D2-D1≤5mm, in the case that the gas pressure in the first containing space 210 is greater than or equal to the first threshold value, the protruding structure 543 can move towards the elastic member 530, so that the deformed portion 531 of the elastic member 530 protrudes towards the valve cover member 520, and the gas in the first containing space 210 is discharged to the outside of the battery monomer 20 through the second containing space 60, so as to effectively balance the installation performance and use performance of the valve assembly 50, thereby improving the use performance of the battery monomer 20.

[0222] In some implementations, as shown in Figure 7 and Figure 8 The sealing portion 541 and the guiding portion 542 are snap-connected or interference-connected.

[0223] Exemplarily, in the case of the clamping connection between the sealing part 541 and the guiding part 542, a first protrusion 544 is arranged on the surface of the sealing part 541 facing the guiding part 542, and a fourth groove 545 is arranged on the surface of the guiding part 542 facing the sealing part 541, and the first protrusion 544 is accommodated in the fourth groove 545 to realize the connection between the sealing part 541 and the guiding part 542.

[0224] In the embodiment of the present application, the sealing part 541 and the guiding part 542 are arranged in clamping connection or sealing connection, so as to take into account the connection strength between the sealing part 541 and the guiding part 542 and the use performance of the sealing assembly 50, and at the same time, the connection mode is simple, facilitating the processing and manufacturing of the valve assembly 50.

[0225] Figure 9 A cross-sectional view of the shell 21 provided by another embodiment of the present application is shown. Figure 10 A cross-sectional view of the shell 21 provided by another embodiment of the present application is shown. As Figure 9 and Figure 10 As shown in the drawings, the valve assembly 50 arranged in the shell 21 is in a sealing state or a closed state, so as to seal and isolate the first containing space 210 and the outside of the battery monomer 20.

[0226] In some implementations, as Figure 9 shown, the outer periphery of the body part 510 away from the electrode assembly 22 is provided with a second extension part 515, the second extension part 515 extends away from the center of the body part 510, the surface of the second extension part 515 away from the electrode assembly 22 is provided with a third groove 516, and the third groove 516 is arranged around the outer periphery of the valve cover part 520 in a plane perpendicular to the thickness direction of the valve assembly 50.

[0227] It should be understood that by arranging the second extension part 515 on the body part 510, the valve assembly 50 is arranged on the first wall 215, that is, the valve assembly 50 is accommodated in the through-hole structure 216 on the first wall 215, thereby improving the assembly efficiency of the battery monomer 20.

[0228] It should also be understood that the shape or number of the third groove 516 arranged on the surface of the second extension part 515 away from the electrode assembly 22 can be arranged according to actual needs. Exemplarily, the shape of the third groove 516 in the plane perpendicular to the thickness direction of the valve assembly 50 can be annular or arc-shaped.

[0229] In the embodiment of the present application, the second extension 515 is arranged on the outer periphery of the main body component 510 away from the electrode assembly 22, and extends away from the center of the main body component 510. The surface of the second extension 515 away from the electrode assembly 22 is provided with a third groove 516. The third groove 516 is arranged around the outer periphery of the valve cover component 520 in a plane perpendicular to the thickness direction of the valve assembly 50. When the valve assembly 50 is installed on the first wall 215, the third groove 516 arranged on the second extension 515 can release the welding stress generated between the valve assembly 50 and the first wall 215, so as to reduce the influence of the welding stress on the weld between the valve assembly 50 and the first wall 215, reduce the risk of seal failure caused by weld cracking, and improve the use performance of the valve assembly 50.

[0230] In some implementations, as shown in Figure 10 the surface of the second extension 515 away from the electrode assembly 22 is provided with a plurality of third grooves 516. In a plane perpendicular to the thickness direction of the valve assembly 50, the plurality of third grooves 516 are arranged in intervals around the outer periphery of the valve cover component 520 in a direction away from the center of the main body component 510.

[0231] It should be understood that the distance between the plurality of third grooves 516 can be arranged according to actual needs. For example, the distance between any two adjacent third grooves 516 in the plurality of third grooves 516 can be arranged at equal intervals.

[0232] In the embodiment of the present application, by arranging a plurality of third grooves 516 on the surface of the second extension 515 away from the electrode assembly 22, and arranging the plurality of third grooves 516 in intervals around the outer periphery of the valve cover component 520 in a direction away from the center of the main body component 510 in a plane perpendicular to the thickness direction of the valve assembly 50, the welding stress generated between the valve assembly 50 and the first wall 215 can be effectively released, so as to reduce the influence of the welding stress on the weld between the valve assembly 50 and the first wall 215, reduce the risk of seal failure caused by weld cracking, and improve the use performance of the valve assembly 50.

[0233] Figure 11 A cross-sectional view of the housing 21 provided by another embodiment of the present application is shown.

[0234] In some implementations, as shown in Figure 11 the surface of the second extension 515 away from the electrode assembly 22 is provided with a plurality of third grooves 516. In a plane perpendicular to the thickness direction of the valve assembly 50, the plurality of third grooves 516 are arranged in intervals around the outer periphery of the valve cover component 520 in a direction away from the center of the main body component 510.

[0235] It should be understood that the gradually decreasing dimension of the second extending portion 515 in the thickness direction of the valve assembly 50 in the direction away from the geometric center of the main body component 510 can refer to that the dimension of the second extending portion 515 in the thickness direction of the valve assembly 50 can be continuously decreasing or decreasing in steps.

[0236] In the embodiment of the present application, by arranging the surface of the second extending portion 515 facing the electrode assembly 22 to be inclined towards the geometric center of the main body component 510, and gradually decreasing the dimension of the second extending portion 515 in the thickness direction of the valve assembly 50 in the direction away from the geometric center of the main body component 510, the assembly between the valve assembly 50 and the first wall 215 is facilitated, and the structure is simple, facilitating the processing and manufacturing of the valve assembly 50.

[0237] Figure 12 A cross-sectional view of the housing 21 provided by another embodiment of the present application is shown.

[0238] In some implementations, as shown in Figure 12 The battery cell 20 further includes an insulating structure 70 arranged on the first surface 2151 of the first wall 215 facing the electrode assembly 22, and the insulating structure 70 is used to wrap the part of the valve assembly 50 protruding from the first surface 2151.

[0239] It should be understood that arranging the insulating structure 70 on the first surface 2151 of the first wall 215 facing the electrode assembly 22 can refer to that the side of the insulating structure 70 facing the first surface 2151 is fixedly connected, for example, adhesively connected, with the first surface 2151.

[0240] It should also be understood that the side of the insulating structure 70 facing the valve assembly 50 can be fixedly connected or not fixedly connected with the part of the main body component 510 of the valve assembly 50 protruding from the first surface 2151. For example, in the case that the side of the insulating structure 70 facing the valve assembly 50 is fixedly connected with the part of the main body component 510 protruding from the first surface 2151, the insulating structure 70 can be adhesively connected with the part of the main body component 510 protruding from the first surface 2151.

[0241] It should also be understood that the material of the insulating structure 70 can be at least one of the following: rubber material, silicone material, or plastic material, etc.

[0242] In the embodiment of the present application, by arranging the insulating structure 70 on the first surface 2151 of the first wall 215 facing the electrode assembly 22, and wrapping the insulating structure 70 around the part of the valve assembly 50 protruding from the first surface 2151, the valve assembly 50 and the electrode assembly 22 are insulated and separated, reducing the risk of short circuit of the battery monomer 20 caused by direct contact between the valve assembly 50 and the electrode assembly 22, thereby improving the use performance of the battery monomer 20.

[0243] In some implementations, as shown in Figure 12 The insulating structure 70 is provided with a third through hole 710 corresponding to the second through hole 513, the third through hole 710 penetrates the insulating structure 70 along the thickness direction of the first wall 215, and in the case that the gas pressure in the first containing space 210 is greater than or equal to the first threshold value, the first containing space 210 is in communication with the second containing space 60 through the third through hole 710 and the second through hole 513 in turn.

[0244] It should be understood that the third through hole 710 corresponding to the second through hole 513 provided on the insulating structure 70 can mean that the projection of the second through hole 513 and the projection of the third through hole 710 overlap each other in the plane perpendicular to the thickness direction of the valve assembly 50, or the projection of the second through hole 513 covers the projection of the third through hole 710.

[0245] It should also be understood that the shape and number of the third through hole 710 can be set according to actual needs. For example, in the plane perpendicular to the thickness direction of the valve assembly 50, the shape of the third through hole 710 can be circular, square or polygonal.

[0246] Specifically, in the case that the gas pressure in the first containing space 210 is greater than or equal to the first threshold value, the gas generated in the first containing space 210 can enter the second containing space 60 through the third through hole 710 and the second through hole 513 in turn, and be discharged to the outside of the battery monomer 20 through the second containing space 60.

[0247] In the embodiment of the present application, by arranging the third through hole 710 corresponding to the second through hole 513 on the insulating structure 70, and the third through hole 710 penetrates the insulating structure 70 along the thickness direction of the first wall 215, in the case that the gas pressure in the first containing space 210 is greater than or equal to the first threshold value, the gas in the first containing space 210 enters the second containing space 60 through the third through hole 710 and the second through hole 513 in turn, and is discharged to the outside of the battery monomer 20 through the second containing space 60, so as to effectively balance the installation performance and use performance of the valve assembly 50, thereby improving the use performance of the battery monomer 20.

[0248] In some embodiments, the material of the sealing portion 541 comprises at least one of the following materials: fluororubber, fluoroplastic, ethylene propylene diene rubber. In this way, in the embodiments of the present application, by setting the material of the sealing portion 541 to comprise at least one of the following materials: fluororubber, fluoroplastic, ethylene propylene diene rubber, the sealing performance between the sealing portion 541 and the main body component 510 is improved, the use performance of the valve assembly 50 is improved, and thus the use performance of the battery monomer 20 is improved.

[0249] In some embodiments, as shown in FIG. 1, the housing 21 comprises an end cover 212 and a shell 211 having an opening, the end cover 212 covering the opening, and the first wall 215 comprising at least part of the end cover 212. Figure 7 to Figure 12

[0250] It should be understood that, compared with the shell 211, the thickness of the end cover 212 is generally set to be thicker, so as to facilitate the assembly of the valve assembly 50 to the end cover 212 and improve the assembly efficiency of the battery monomer 20.

[0251] It should also be understood that the pressure relief mechanism 213 in the embodiments of the present application can be arranged on the same wall or different walls of the valve assembly 50 in the housing 21. For example, the pressure relief mechanism 213 and the valve assembly 50 can be arranged on the end cover 212.

[0252] In the embodiments of the present application, by setting the first wall 215 to comprise at least part of the end cover 212, i.e., the first wall 215 on which the valve assembly 50 is arranged on the end cover 212, the assembly of the valve assembly 50 is facilitated, and the processing and manufacturing of the battery monomer 20 are facilitated, and the use performance of the battery monomer 20 is improved.

[0253] In some embodiments, the materials of the main body component 510, the valve cover component 520, and the end cover 212 are the same. For example, the materials of the main body component 510, the valve cover component 520, and the end cover 212 can be set to at least one of the following materials: steel, titanium alloy, aluminum, etc.

[0254] In this way, in the embodiments of the present application, by setting the materials of the main body component 510, the valve cover component 520, and the end cover 212 to be the same, the processing and manufacturing of the battery monomer 20 are facilitated, and the production cost is reduced.

[0255] In some embodiments, the battery monomer 20 is a sodium ion battery monomer or a sodium metal battery monomer. In this way, in the embodiments of the present application, by setting the battery monomer 20 to be a sodium ion battery monomer or a sodium metal battery monomer, the use performance and manufacturing performance of the battery monomer 20 are improved.

[0256] ​According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10 comprising a plurality of battery cells 20, which are any of the battery cells 20 described above.

[0257] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10 comprising a plurality of battery cells 20, which are any of the battery cells 20 described above. Figure 1 The vehicle 1 shown in the figure can also be any power-using device using the battery device 10.

[0258] The power-using device can be any of the devices or systems using the battery device 10 described above.

[0259] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10 comprising a plurality of battery cells 20, which are any of the battery cells 20 described above.

[0260] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10 comprising a plurality of battery cells 20, which are any of the battery cells 20 described above. Figure 5 to Figure 8As shown, a battery cell 20 is provided, which includes a housing 21 having a first accommodation space 210, an electrode assembly 22 accommodated in the first accommodation space 210, and a valve assembly 50 provided at a first wall 215 of the housing 21, the valve assembly 50 having a second accommodation space 60, the valve assembly 50 including a main body part 510, a valve cover part 520, an elastic part 530, and a sealing assembly 540, the main body part 510 and the valve cover part 520 enclosing the second accommodation space 60, the elastic part 530 and the sealing assembly 540 both accommodated in the second accommodation space 60, the elastic part 530 connected to the sealing assembly 540, wherein, in a case where a gas pressure in the first accommodation space 210 is greater than or equal to a first threshold value A1, a portion of the elastic part 530 protrudes toward the valve cover part 520, and a gas in the first accommodation space 210 is discharged to an outside of the battery cell 20 through the second accommodation space 60; in a case where the gas pressure in the first accommodation space 210 is less than or equal to a second threshold value A2, a portion of the elastic part 530 protrudes toward the electrode assembly 22, and the first accommodation space 210 is sealingly isolated from the second accommodation space 60, the first threshold value A1 being greater than the second threshold value A2. A difference between the second threshold value A2 and the first threshold value A1 satisfies: 0.2 MPa ≤ A2-A1 ≤ 0.3 MPa. The elastic part 530 includes a deformation part 531 and a first extension part 532 connected to an outer periphery of the deformation part 531 and extending away from a geometric center of the elastic part 530, a surface of the first extension part 532 on a side toward the valve cover part 520 is fixedly connected to a portion of a surface of the valve cover part 520 on a side toward the elastic part 530, in a case where the gas pressure in the first accommodation space 210 is greater than or equal to the first threshold value, the deformation part 531 protrudes toward the valve cover part 520; in a case where the gas pressure in the first accommodation space 210 is less than or equal to the second threshold value, the deformation part 531 protrudes toward the electrode assembly 22. In a thickness direction of the valve assembly 50, a maximum deformation amount L0 of the deformation part 531 is less than a maximum dimension L1 between a surface of the valve cover part 520 on a side toward the electrode assembly 22 and a surface of the sealing assembly 540 on a side away from the electrode assembly 22.

[0261] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, comprising: a housing having a first accommodating space; an electrode assembly accommodated in the first accommodating space; a valve assembly arranged on a first wall of the housing, the valve assembly having a second accommodating space, the valve assembly comprising a main body part, a valve cover part, an elastic part and a sealing assembly, the main body part and the valve cover part enclosing the second accommodating space, the elastic part and the sealing assembly being accommodated in the second accommodating space, the elastic part being connected to the sealing assembly; wherein the elastic part is configured to protrude in the direction of the valve cover part when the gas pressure in the first accommodating space is greater than or equal to a first threshold value A1, the gas in the first accommodating space being discharged to the outside of the battery cell through the second accommodating space; and the elastic part is configured to protrude in the direction of the electrode assembly when the gas pressure in the first accommodating space is less than or equal to a second threshold value A2, the first accommodating space being sealed and isolated from the second accommodating space, the first threshold value A1 being greater than the second threshold value A2.

2. The battery cell of claim 1, wherein, The difference between the first threshold value A1 and the second threshold value A2 satisfies 0.1 MPa <= A1-A2 <= 0.3 MPa.

3. The battery cell of claim 1, wherein, The difference between the first threshold value A1 and the second threshold value A2 satisfies 0.2 MPa <= A1-A2 <= 0.3 MPa.

4. The battery cell of claim 1, wherein, The elastic part comprises a deformation part and a first extension part, the first extension part being connected to the outer periphery of the deformation part and extending in the direction away from the geometric center of the elastic part, the surface of the first extension part on the side facing the valve cover part being fixedly connected to the surface of the valve cover part on the side facing the elastic part, the deformation part protrudes in the direction of the valve cover part when the gas pressure in the first accommodating space is greater than or equal to the first threshold value; and the deformation part protrudes in the direction of the electrode assembly when the gas pressure in the first accommodating space is less than or equal to the second threshold value.

5. The battery cell of claim 4, wherein, In the thickness direction of the valve assembly, the maximum deformation amount L0 of the deformation part is less than the maximum size L1 between the surface of the valve cover part on the side facing the electrode assembly and the surface of the sealing assembly on the side facing away from the electrode assembly.

6. The battery cell of claim 4, wherein, The valve cover part is provided with a first through hole penetrating through the valve cover part in the thickness direction of the valve assembly, and the projection of the deformation part covers the projection of the first through hole in a plane perpendicular to the thickness direction of the valve assembly.

7. The battery cell of claim 4, wherein, At least part of the surface of the first extension part on the side facing the valve cover part is welded to the surface of the valve cover part on the side facing the elastic part.

8. The battery cell of claim 4, wherein, The main body part comprises a first groove and a second groove arranged in a stepped manner, one end of the first groove being formed on the surface of the main body part on the side facing away from the electrode assembly, the second groove being located on the side of the first groove facing the electrode assembly, and the openings of the first groove and the second groove both face away from the electrode assembly; wherein at least part of the valve cover part is accommodated in the first groove, and at least part of the sealing assembly is accommodated in the second groove.

9. The battery cell of claim 8, wherein, A bottom wall of the second groove is provided with a second through hole, the second through hole communicates the first accommodation space and the second accommodation space when the air pressure in the first accommodation space is greater than or equal to a first threshold value, a projection of the sealing assembly covers a projection of the second through hole on a plane perpendicular to a thickness direction of the valve assembly.

10. The battery cell of claim 9, wherein, An inner diameter r1 of the second through hole and a maximum dimension r2 of the sealing assembly in a direction perpendicular to the thickness direction of the valve assembly satisfy: 0.5≤r1 / r2≤0.

8.

11. The battery cell of claim 8, wherein, A surface of the first groove facing the second accommodation space is provided with an inner recess, the inner recess communicates the second accommodation space and an outside of the battery monomer.

12. The battery cell of claim 11, wherein, The valve cover component is welded to a side wall of the first groove except the inner recess.

13. The battery cell of claim 9, wherein, The sealing assembly includes a sealing part and a guide part, the guide part is located on a side of the sealing part away from the electrode assembly, a surface of the guide part away from the electrode assembly is provided with a protruding structure protruding towards the elastic component, the sealing part is fixedly connected to the guide part, Wherein, when the air pressure in the first accommodation space is less than or equal to the second threshold value, a surface of the sealing part facing the electrode assembly abuts against a part surface of the second groove facing the second accommodation space.

14. The battery cell of claim 13, wherein, In a direction perpendicular to the thickness direction of the valve assembly, a maximum dimension D1 of the protruding structure and a maximum dimension D2 of the deformed part satisfy: 0mm≤D2-D1≤5mm.

15. The battery cell of claim 13, wherein, The sealing part and the guide part are connected by clamping or interference.

16. The battery cell of claim 10, wherein, A side of the main body component away from the electrode assembly is provided with a second extension, the second extension extends away from a center of the main body component, a surface of the second extension away from the electrode assembly is provided with a third groove, the third groove is arranged around an outer periphery of the valve cover component on a plane perpendicular to a thickness direction of the valve assembly.

17. The battery cell of claim 16, wherein, A surface of the second extension away from the electrode assembly is provided with a plurality of the third grooves, the plurality of the third grooves are arranged around the outer periphery of the valve cover component in a direction away from the center of the main body component on a plane perpendicular to the thickness direction of the valve assembly.

18. The battery cell of claim 16, wherein, A surface of the second extension facing the electrode assembly is inclined towards a geometric center of the main body component, in a direction away from the geometric center of the main body component, a dimension of the second extension in the thickness direction of the valve assembly gradually decreases.

19. The battery cell of claim 10, wherein, The battery monomer further includes an insulation structure, the insulation structure is arranged on a first surface of the first wall facing the electrode assembly, and the insulation structure is used for wrapping a part of the valve assembly protruding from the first surface.

20. The battery cell of claim 19, wherein, The insulation structure is provided with a third through hole corresponding to the second through hole, the third through hole penetrates the insulation structure in a thickness direction of the first wall, When the air pressure in the first accommodation space is greater than or equal to the first threshold value, the first accommodation space communicates with the second accommodation space through the third through hole and the second through hole in sequence.

21. The battery cell of claim 13, wherein, The material of the sealing portion includes at least one of the following materials: fluoroelastomer, fluoroplastic, ethylene propylene diene rubber.

22. The battery cell of any one of claims 1-21, wherein, The housing includes an end cap and a shell having an opening, the end cap covering the opening, the first wall including at least a portion of the end cap.

23. The battery cell of claim 22, wherein, The material of the main body component, the valve cover component, and the end cap is the same.

24. The battery cell of claim 23, wherein, The battery cell is a sodium-ion battery cell or a sodium-metal battery cell.

25. A battery device, characterized by Comprising: A plurality of battery cells, the battery cells being as claimed in any one of claims 1 to 24.

26. An electrical device, comprising: Comprising: The battery device of claim 25, the battery device being configured to provide electrical energy to the electrical device.

27. An energy storage device, comprising: Comprising: The battery device of claim 25, the battery device being configured to store electrical energy for the energy storage device.

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