Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The embodiment of the utility model provides a battery monomer which comprises a shell, a first valve and a second valve, the shell is provided with a liquid injection hole and an exhaust hole, one of the first valve and the second valve is arranged in the liquid injection hole, and the other one of the first valve and the second valve is arranged in the exhaust hole. The first valve and the second valve are configured to be capable of switching connection and disconnection between the inner space of the shell and the outer space of the shell. According to the invention, the influence of the external environment on the battery monomer production process can be reduced, so that the production quality is improved and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] During the production process of battery cells, the external environment has an important impact on the production quality of battery cells. It is usually necessary to strictly control the external environment to reduce the risk of battery cell scrapping. However, strict external environment control will also increase the overall production cost of battery cells. Therefore, how to effectively reduce the impact of the external environment on battery cells during the production process is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can reduce the impact of the external environment on the battery cell production process, so as to improve production quality and reduce costs.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes a shell, a first valve, and a second valve. The shell is provided with an injection hole and an exhaust hole. One of the first valve and the second valve is arranged at the injection hole, and the other of the first valve and the second valve is arranged at the exhaust hole. The first valve and the second valve are both configured to be able to switch the connection between the internal space of the shell and the external space of the shell.

[0006] The above technical solution can open the first valve and / or the second valve to provide operating conditions for the processing of the battery monomer when the battery monomer is undergoing a processing procedure that requires the internal space of the shell to be connected with the external space of the shell to complete the relevant operation; when the battery monomer is not being processed or is undergoing a processing procedure that does not require the internal space of the shell to be connected with the external space of the shell to complete the relevant operation, the first valve and / or the second valve can be closed to isolate the interaction between the external environment and the interior of the battery monomer, thereby reducing the impact of the external environment on the internal structure and components of the battery monomer caused by the interaction between the external environment and the internal space of the shell through the injection hole and the exhaust hole, thereby helping to improve production quality. At the same time, since the impact of the external environment on the battery monomer during the production process is reduced, the control standards of the external environment can be lowered or the control of the external environment can be cancelled, thereby helping to reduce production costs.

[0007] In addition, the structures of the first valve and the second valve can be designed differently according to the different structures of the injection hole and the exhaust hole, so as to better meet the process requirements of injection and exhaust, thereby helping to further improve production quality.

[0008] In some embodiments of the first aspect, the housing includes a first wall and a second wall, the exhaust hole is disposed on the first wall, and the injection hole is disposed on the second wall.

[0009] By arranging the exhaust hole and the injection hole on the first wall and the second wall respectively, on the one hand, the installation space of the first valve and the second valve can be increased, which is conducive to reducing the difficulty of installing the first valve and the second valve; on the other hand, it also helps to maintain the structural stability and balance of the shell, thereby improving the overall reliability of the battery cell.

[0010] In some embodiments of the first aspect, the first wall and the second wall are arranged opposite to each other, which can further improve the structural balance of the entire housing.

[0011] In some embodiments of the first aspect, the housing includes an end cap and a shell, the shell has an opening, the end cap covers the opening, and the end cap is configured as a first wall. The shell includes a second wall, and the second wall is arranged opposite to the end cap.

[0012] The above technical solution can not only improve the gas exhaust efficiency in the processing steps of the battery cell that require exhaust, but also effectively reduce the risk of electrolyte contamination of the battery cell in the liquid injection process of the battery cell.

[0013] In some embodiments of the first aspect, the first valve includes a first main body and a first core, the first main body includes a first port and a second port that are connected, the first port is connected to an external space, and the second port is connected to an internal space. The first core is disposed in the first main body, and the first core is configured to be able to open when subjected to pressure so that the first port and the second port are connected, and to be able to isolate the first port and the second port when not under pressure.

[0014] The above technical solution sets the first valve as a push-type valve. During the opening and closing of the first valve, the first core moves in a direction close to the inner space of the shell, which can significantly reduce the requirements for the external operating space of the battery cell and help adapt to more processing procedures of the battery cell. In addition, the first valve is opened by pressing, which makes the operation more convenient and can effectively improve the production efficiency of the battery cell.

[0015] In some embodiments of the first aspect, the first valve further includes a first elastic body, the first elastic body connects the first main body portion and the first core portion, and the first elastic body applies a force to the first core portion in a direction close to the first port.

[0016] The above technical solution provides a preset force for the first core portion by setting a first elastomer, which not only has a simple structure and is conducive to reducing the preparation cost of the first valve, but also can flexibly adjust the shape, size and material of the first elastomer according to different application environments and requirements, thereby helping to improve the design flexibility and applicability of the first valve.

[0017] In some embodiments of the first aspect, the first elastic body is disposed on a side of the first core portion facing away from the first port.

[0018] The first elastomer being in a compressed state can make the volume of the first elastomer relatively small, thereby reducing the occupancy rate of the first elastomer in the internal space of the first valve, thereby freeing up more space inside the first valve for realizing functions such as transporting electrolyte or gas during the processing of the battery cell, thereby improving the production efficiency of the battery cell.

[0019] In some embodiments of the first aspect, the first main body portion further includes a cavity, the cavity communicating with the first port and the second port. The first core portion includes a body and a convex portion connected to each other, the convex portion protruding from a side surface of the body close to the first port, the body is disposed in the cavity, and a side surface of the body close to the first port abuts against the first main body portion, and at least a portion of the convex portion is accommodated in the first port.

[0020] The above technical solution can improve the sealing performance when the first valve is in a closed state, thereby reducing the impact of external environmental factors on the battery cell during the production process, so as to further improve the production quality.

[0021] In some embodiments of the first aspect, the second valve includes a second main body and a second core, the second main body includes a third port and a fourth port connected, the third port is connected to the internal space. The second core is disposed in the second main body, a portion of the second core passes through the fourth port and extends out of the housing, the second core is provided with a channel, the channel is connected to the external space, and the second core is configured to be opened when subjected to a pulling force so that the third port is connected to the channel, and to be isolated from the third port and the channel when not subjected to a pulling force.

[0022] The above technical solution configures the second valve as a pull-out valve. During the opening and closing of the second valve, the second core moves in a direction away from the internal space of the outer shell, thereby reducing the risk of the second core falling off and into the internal space of the outer shell during movement, thereby facilitating improving the reliability of the battery cell.

[0023] In some embodiments of the first aspect, the second valve further includes a second elastic body, the second elastic body connects the second main body portion and the second core portion, and the second elastic body applies a force to the second core portion in a direction away from the fourth port.

[0024] The above technical solution provides a preset force for the second core portion by setting a second elastomer, which not only has a simple structure and is conducive to reducing the preparation cost of the second valve, but also can flexibly adjust the shape, size and material of the second elastomer according to different application environments and requirements, thereby helping to improve the design flexibility and applicability of the second valve.

[0025] In some embodiments of the first aspect, the second elastic body is disposed on a side of the second core portion close to the fourth port.

[0026] The second elastomer being in a compressed state can make the volume of the second elastomer relatively small, thereby reducing the occupancy rate of the second elastomer in the internal space of the second valve, thereby freeing up more space inside the second valve for realizing functions such as transporting electrolyte or gas during the processing of the battery cell, thereby improving the production efficiency of the battery cell.

[0027] In some embodiments of the first aspect, the second valve further includes an anti-slip member connected to a portion of the second core portion extending out of the housing.

[0028] The above technical solution provides an anti-slip part, which can increase the friction coefficient of the part of the second core body extending out of the shell to reduce the risk of the second core body slipping after being grasped by an operator or equipment, thereby improving the reliability of the second valve.

[0029] In a second aspect, the present application provides a battery, which includes a battery cell provided by any embodiment of the first aspect.

[0030] In a third aspect, the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect, wherein the battery cell is used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0034] Figure 2A schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0035] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application;

[0036] Figure 4 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0037] Figure 5 for Figure 4 A schematic diagram of the top view of the battery cell shown;

[0038] Figure 6 for Figure 5 A schematic cross-sectional structure diagram of a battery cell along AA when the first valve and the second valve are both in a closed state;

[0039] Figure 7 for Figure 6 A schematic diagram of the local enlarged structure at D;

[0040] Figure 8 for Figure 6 A schematic diagram of the local enlarged structure along F;

[0041] Fig. 9 for Figure 5 A schematic cross-sectional structure diagram of a battery cell along AA when the first valve and the second valve are both in an open state;

[0042] Fig.10 for Fig. 9 A schematic diagram of the local enlarged structure at G;

[0043] Fig.11 for Fig. 9 Schematic diagram of the local enlarged structure along H.

[0044] The reference numerals in the specific implementation manner are as follows:

[0045] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Box; 5a. First box portion; 5b. Second box portion; 5c. Accommodation space; 6. Battery module; 7. Battery cell;

[0046] 10. Shell; 10a. Shell; 10b. End cover; 11. Filling hole; 12. Exhaust hole; 13. First wall; 14. Second wall; 20. First valve; 21. First main body; 211. First port; 212. Second port; 213. Cavity; 22. First core body; 221. Main body; 222. Protrusion; 23. First elastomer; 30. Second valve; 31. Second main body; 311. Third port; 312. Fourth port; 32. Second core body; 321. Channel; 33. Second elastomer; 34. Anti-slip part. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0049] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the embodiments of the present application, the same reference numerals 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, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0053] The term "plurality" used in the present application refers to two or more (including two).

[0054] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0055] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0056] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0057] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode.

[0058] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting while allowing active ions to pass through.

[0059] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0060] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector.

[0061] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, silver-surface-treated aluminum, silver-surface-treated stainless steel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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 substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] As an example, the positive electrode active material layer includes a positive electrode active material. The positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0063] In some embodiments, the positive electrode may be carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam or alloy foam. When the metal foam is used as the positive electrode, the positive electrode active material may not be provided on the surface of the metal foam, but the positive electrode active material may also be provided. As an example, lithium source material, potassium metal or sodium metal may be filled or / and deposited in the metal foam, and the lithium source material is lithium metal and / or lithium-rich material.

[0064] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0065] As an example, the negative electrode current collector may be a metal foil, a foamed metal, a foamed carbon or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, silver-surface-treated aluminum, silver-surface-treated stainless steel, a carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum or a foamed alloy, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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 substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0067] In some embodiments, the negative electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy, etc. When the foamed metal is used as the negative electrode sheet, the surface of the foamed metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0068] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0069] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0070] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0071] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0072] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0073] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0074] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0075] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0076] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0077] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0078] The gel electrolyte includes a polymer-based electrolyte framework network combined with an ionic liquid-lithium salt.

[0079] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0080] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0081] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0082] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0083] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0084] In some embodiments, the electrode assembly is a laminate structure.

[0085] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0086] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0087] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0088] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0089] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0090] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0091] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0092] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0093] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0094] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0095] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0096] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0097] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0098] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0099] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0100] During the production process of battery cells, the external environment has an important impact on the production quality of battery cells. Strict control of the external environment is usually required to reduce the risk of battery cell scrapping. However, strict external environment control will also increase the overall production cost of battery cells accordingly.

[0101] In some processes or links in the production process of battery cells, the internal space of the shell needs to be connected with the external space of the shell in order to complete the relevant operations. For example, in the baking process of the battery cell, the internal space of the shell needs to be connected with the external space of the shell so that the water vapor in the internal space can be discharged to the external space; in the injection process of the battery cell, the internal space of the shell needs to be connected with the external space of the shell so that the injection equipment located in the external space of the shell can inject the electrolyte into the external space of the shell; in the formation process of the battery cell, the internal space of the shell needs to be connected with the external space of the shell so that the gas generated by the formation process in the internal space can be discharged to the external space.

[0102] It is understandable that when the internal space of the shell is in a state of communication with the external space of the shell, some factors in the external environment will affect the structure or components in the internal space of the shell. For example, if the humidity in the production plant of the battery cell is high, when the internal space of the shell is in a state of communication with the external space of the shell, moisture will enter the internal space of the shell, thereby affecting the pole piece, diaphragm or electrolyte in the internal space of the shell.

[0103] If during the production process of the battery cell, the internal space of the shell is always or for a long time in a connected state, in other words, when the battery cell is not processed or when a processing procedure that does not require the internal space of the shell to be connected with the external space of the shell is performed to complete the relevant operation, the internal space of the shell and the external space of the shell are still in a connected state, which will increase the risk of damage to the internal structure or components of the battery cell by external environmental factors, and easily lead to the scrapping of the battery cell. Therefore, it is often necessary to strictly control the external environment during the production process of the battery cell, such as the humidity in the production plant, to reduce the risk of damage to the pole piece, diaphragm or electrolyte inside the battery cell caused by the external environment. However, the cost of controlling the external environment is high, and therefore, the overall production cost of the battery cell will be increased accordingly, seriously affecting the economic benefits.

[0104] Based on the above considerations, the present application designs a battery cell, which includes a shell, a first valve and a second valve. The shell is provided with an injection hole and an exhaust hole. One of the first valve and the second valve is arranged at the injection hole, and the other of the first valve and the second valve is arranged at the exhaust hole. The first valve and the second valve are both configured to be able to switch the connection between the internal space of the shell and the external space of the shell.

[0105] When the battery cell is undergoing a processing procedure that requires the internal space of the shell to be connected with the external space of the shell in order to complete the relevant operation, the first valve and / or the second valve are opened to provide operating conditions for the processing procedure of the battery cell; when the battery cell is not being processed or is undergoing a processing procedure that does not require the internal space of the shell to be connected with the external space of the shell in order to complete the relevant operation, the first valve and / or the second valve are closed to isolate the interaction between the external environment and the interior of the battery cell, and reduce the impact of the external environment on the internal structure and components of the battery cell due to the interaction between the external environment and the internal space of the shell through the injection hole and the exhaust hole, thereby helping to improve production quality. At the same time, since the impact of the external environment on the battery cell during the production process is reduced, the control standards of the external environment can be lowered or the control of the external environment can be cancelled, which is conducive to reducing production costs.

[0106] In addition, the structures of the first valve and the second valve can be designed differently according to the different structures of the injection hole and the exhaust hole, so as to better meet the process requirements of injection and exhaust, thereby helping to further improve production quality.

[0107] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0108] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0109] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including battery boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0110] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0111] Continue to refer Figure 1The vehicle 1 is provided with a battery 2 inside, and the battery 2 can be provided at the bottom, head, or tail of the vehicle 1. The battery 2 can be used for powering the vehicle 1, for example, the battery 2 can be used as an operating power source for the vehicle 1.

[0112] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0113] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0114] Figure 2 An exploded schematic diagram of a battery provided for some embodiments of the present application.

[0115] Continue to refer Figure 2 The battery 2 includes a box body 5 and a battery cell, and the battery cell is accommodated in the box body 5.

[0116] The box 5 is used to accommodate the battery cells, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 5a and a second box portion 5b, the first box portion 5a and the second box portion 5b cover each other, and the first box portion 5a and the second box portion 5b jointly define a storage space 5c for accommodating the battery cells. The second box portion 5b can be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c; the first box portion 5a and the second box portion 5b can also be hollow structures with one side open, and the open side of the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c. Of course, the first box portion 5a and the second box portion 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0117] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0118] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0119] In the battery 2, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells are both connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 5; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 6, and the multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5.

[0120] Figure 3 for Figure 2 Schematic diagram of the structure of the battery module shown.

[0121] In some embodiments, referring to the figure, there are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed connection to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in the box.

[0122] The multiple battery cells 7 in the battery module 6 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0123] Figure 4 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application is shown in FIG. Figure 5 for Figure 4 The schematic diagram of the top view of the battery cell shown in FIG. Figure 6 for Figure 5 The schematic cross-sectional structure diagram of the battery cell shown is taken along AA when both the first valve and the second valve are in a closed state. Figure 7 for Figure 6 The local enlarged structural diagram at D is as follows: Figure 8 for Figure 6 A schematic diagram of the local enlarged structure along F. Fig. 9 for Figure 5 The schematic cross-sectional structure diagram of the battery cell shown in FIG. 1 along AA when the first valve and the second valve are both in an open state, Fig.10 for Fig. 9 Schematic diagram of the local enlarged structure at G, Fig.11 for Fig. 9 Schematic diagram of the local enlarged structure along H.

[0124] like Figures 4 to 11As shown, an embodiment of the present application provides a battery cell 7, which includes a shell 10, a first valve 20 and a second valve 30. The shell 10 is provided with an injection hole 11 and an exhaust hole 12. One of the first valve 20 and the second valve 30 is arranged at the injection hole 11, and the other of the first valve 20 and the second valve 30 is arranged at the exhaust hole 12. The first valve 20 and the second valve 30 are both configured to be able to switch the internal space of the shell 10 and the external space of the shell 10.

[0125] Exemplarily, the housing 10 is a component for forming an internal environment of the battery cell 7. The formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. Optionally, the housing 10 can be but is not limited to being made of metal or non-metal materials, for example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0126] The electrode assembly is a component in the battery cell 7 where electrochemical reactions occur. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the terminal group to form a current loop.

[0127] The outer shell 10 is provided with a liquid injection hole 11, which connects the inner space of the outer shell 10 with the outer space, so that the liquid injection device can inject electrolyte into the inner space of the battery cell 7 during the liquid injection process of the battery cell 7. The outer shell 10 is provided with an exhaust hole 12, which connects the inner space of the outer shell 10 with the outer space, so that water vapor can be discharged during the baking process of the battery cell 7 and gas can be discharged during the formation process of the battery cell 7.

[0128] The first valve 20 and the second valve 30 are respectively arranged at the injection hole 11 and the exhaust hole 12. The first valve 20 can be arranged at the injection hole 11 and the second valve 30 can be arranged at the exhaust hole 12; or the first valve 20 can be arranged at the exhaust hole 12 and the second valve 30 can be arranged at the injection hole 11.

[0129] The first valve 20 is configured to be able to switch the connection between the internal space of the housing 10 and the external space of the housing 10. In other words, the first valve 20 includes an open state and a closed state, and the first valve 20 can be switched between the open state and the closed state. Specifically, when the first valve 20 is in the open state, the internal space of the housing 10 is in a connected state with the external space of the housing 10; when the first valve 20 is in the closed state, the internal space of the housing 10 is in an isolated state with the external space of the housing 10.

[0130] Optionally, the first valve 20 may be opened or closed by, but is not limited to, manual operation, mechanical operation, electrical signal, or instruction of an automated control system.

[0131] The second valve 30 is configured to be able to switch the connection between the internal space of the housing 10 and the external space of the housing 10. In other words, the second valve 30 includes an open state and a closed state, and the second valve 30 can be switched between the open state and the closed state. Specifically, when the second valve 30 is in the open state, the internal space of the housing 10 is in a connected state with the external space of the housing 10; when the second valve 30 is in the closed state, the internal space of the housing 10 is in an isolated state with the external space of the housing 10.

[0132] Optionally, the second valve 30 may be opened or closed by, but not limited to, manual operation, mechanical operation, electrical signal or command of an automated control system.

[0133] The first valve 20 and the second valve 30 may have the same physical structure or different physical structures. As an example, the first valve 20 may be an electrically controlled valve and the second valve 30 may be a mechanical valve; the first valve 20 and the second valve 30 may both be electrically controlled valves; or the first valve 20 and the second valve 30 may both be mechanical valves. It should be noted that an electrically controlled valve refers to a valve that is opened or closed by an electrical signal, and a mechanical valve refers to a valve that is opened or closed by applying an external force.

[0134] The first valve 20 may be detachably connected to the housing 10, or may be integrally provided on the housing 10. The first valve 20 may be directly connected to the housing 10, or may be restricted to the housing 10 by other components. As an example, the connection between the first valve 20 and the housing 10 may be, but is not limited to, bolt connection, welding, riveting, or clamping.

[0135] The second valve 30 may be detachably connected to the housing 10, or may be integrally provided on the housing 10. The second valve 30 may be directly connected to the housing 10, or may be restricted to the housing 10 by other components. As an example, the connection method between the second valve 30 and the housing 10 may be, but is not limited to, bolt connection, welding, riveting, or clamping.

[0136] Optionally, the first valve 20 and the second valve 30 may be made of, but not limited to, metal or non-metal materials. For example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene, polyvinyl chloride or rubber, etc. As an example, the first valve 20 and the second valve 30 may be made of the same material to simplify the manufacturing process and help reduce costs.

[0137] In some processes or links in the production process of the battery cell 7, the internal space of the shell 10 needs to be connected with the external space of the shell 10 in order to complete the relevant operations. For example, in the baking process of the battery cell 7, the internal space of the shell 10 needs to be connected with the external space of the shell 10 so that the water vapor in the internal space can be discharged to the external space; in the injection process of the battery cell 7, the internal space of the shell 10 needs to be connected with the external space of the shell 10 so that the injection equipment located in the external space of the shell 10 can inject the electrolyte into the external space of the shell 10; in the formation process of the battery cell 7, the internal space of the shell 10 needs to be connected with the external space of the shell 10 so that the gas generated by the formation process in the internal space can be discharged to the external space.

[0138] As an example, the first valve 20 is provided at the injection hole 11, so that when the battery cell 7 is undergoing the injection process, the first valve 20 is opened, so that the internal space of the housing 10 is in a state of communication with the external space of the housing 10, so that the injection device can inject electrolyte into the battery cell 7; after the battery cell 7 completes the injection process, the first valve 20 is closed, so that the internal space of the housing 10 is in an isolated state with the external space of the housing 10, so as to isolate the interaction between the external environment and the interior of the battery cell 7, so as to reduce the influence of external environmental factors on the internal structure and components of the battery cell 7. The second valve 30 is provided at the exhaust hole 12, so that when the battery cell 7 is undergoing the baking process or the formation process, the second valve 30 is opened, so that the internal space of the housing 10 is in a state of communication with the external space of the housing 10, so as to discharge water vapor or gas; after the battery cell 7 completes the baking process or the formation process, the second valve 30 is closed, so that the internal space of the housing 10 is in an isolated state with the external space of the housing 10, so as to isolate the interaction between the external environment and the interior of the battery cell 7, so as to reduce the influence of external environmental factors on the internal structure and components of the battery cell 7.

[0139] It should be understood that the technical solution described in the embodiments of the present application is not limited to the baking process, liquid injection process and chemical formation process described above, but can also be applied to all processing processes that require the internal space of the shell 10 to be connected with the external space of the shell 10 in order to complete the relevant operations. However, for the sake of simplicity of description, the following embodiments are explained using the baking process, liquid injection process or chemical formation process as an example.

[0140] It is understandable that, when the internal space of the housing 10 is in a state of communication with the external space of the housing 10, some factors in the external environment may affect the structure or components in the internal space of the housing 10. For example, if the humidity in the production plant of the battery cell 7 is high, when the internal space of the housing 10 is in a state of communication with the external space of the housing 10, moisture may enter the internal space of the housing 10, thereby affecting the pole piece, diaphragm or electrolyte in the internal space of the housing 10.

[0141] If during the production process of the battery cell 7, the internal space of the shell 10 is always or for a long time in a connected state with the external space of the shell 10, in other words, when the battery cell 7 is not processed or a processing procedure that does not require the internal space of the shell 10 to be connected with the external space of the shell 10 is being performed to complete the relevant operation, the internal space of the shell 10 is still in a connected state with the external space of the shell 10, which will increase the risk of damage to the internal structure or components of the battery cell 7 by external environmental factors, and easily lead to the scrapping of the battery cell 7. Therefore, it is often necessary to strictly control the external environment during the production process of the battery cell 7, such as the humidity in the production plant, to reduce the risk of damage to the pole piece, diaphragm or electrolyte inside the battery cell 7 by the external environment. However, the cost of controlling the external environment is high, and therefore, the overall production cost of the battery cell 7 will be increased accordingly, seriously affecting the economic benefits.

[0142] In this way, the above technical solution of the present application can open the first valve 20 and / or the second valve 30 to provide operating conditions for the processing of the battery cell 7 when the battery cell 7 is undergoing a processing procedure that requires the internal space of the shell 10 to be connected with the external space of the shell 10 to complete the relevant operation; when the battery cell 7 is not being processed or is undergoing a processing procedure that does not require the internal space of the shell 10 to be connected with the external space of the shell 10 to complete the relevant operation, the first valve 20 and / or the second valve 30 are closed to isolate the interaction between the external environment and the inside of the battery cell 7, effectively reducing the impact of the external environment on the internal structure and components of the battery cell 7 due to the interaction between the external environment and the internal space of the shell 10 through the injection hole 11 and the exhaust hole 12, thereby helping to improve the production quality. At the same time, since the impact of the external environment on the battery cell 7 during the production process is reduced, the control standard of the external environment can be lowered or the control of the external environment can be cancelled, thereby helping to reduce production costs.

[0143] In addition, the structures of the first valve 20 and the second valve 30 can be designed differently according to the different structures of the injection hole 11 and the exhaust hole 12, so as to better meet the process requirements of injection and exhaust, thereby facilitating further improving the production quality.

[0144] In some embodiments, the housing 10 includes a first wall 13 and a second wall 14 , the exhaust hole 12 is disposed on the first wall 13 , and the injection hole 11 is disposed on the second wall 14 .

[0145] Exemplarily, the first wall 13 and the second wall 14 are different walls on the housing 10 . The first wall 13 and the second wall 14 may be disposed adjacent to each other, or the first wall 13 and the second wall 14 may be disposed opposite to each other.

[0146] By arranging the exhaust hole 12 and the injection hole 11 on the first wall 13 and the second wall 14 respectively, on the one hand, the installation space of the first valve 20 and the second valve 30 can be increased, which is conducive to reducing the difficulty of installing the first valve 20 and the second valve 30; on the other hand, it also helps to maintain the structural stability and balance of the outer shell 10, thereby improving the overall reliability of the battery cell 7.

[0147] In some embodiments, the first wall 13 and the second wall 14 are arranged opposite to each other, which can further improve the overall structural balance of the housing 10 .

[0148] Exemplarily, the first wall 13 and the second wall 14 may be arranged opposite to each other along the height direction of the battery cell 7 , the first wall 13 and the second wall 14 may be arranged opposite to each other along the width direction of the battery cell 7 , or the first wall 13 and the second wall 14 may be arranged opposite to each other along the length direction of the battery cell 7 .

[0149] In some embodiments, the housing 10 includes an end cap 10b and a shell 10a, the shell 10a has an opening, the end cap 10b covers the opening, and the end cap 10b is configured as a first wall 13. The shell 10a includes a second wall 14, and the second wall 14 is arranged opposite to the end cap 10b.

[0150] Exemplarily, the end cap 10b refers to a component that covers the opening of the shell 10a to isolate the internal environment of the battery cell 7 from the external environment. Optionally, the shape of the end cap 10b can be adapted to the shape of the shell 10a to match the shell 10a. Optionally, the end cap 10b can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 10b is not easy to deform when it is squeezed and collided, so that the battery cell 7 can have a higher structural strength and reliability can also be improved. Functional components such as terminal groups can be arranged on the end cap 10b. In some embodiments, the end cap 10b can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 77 reaches a threshold. The material of the end cap 10b can also be a variety of materials, for example, the end cap 10b can be but not limited to being made of metal or non-metallic materials, for example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metallic material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0151] The shell 10a is a component used to cooperate with the end cap 10b to form the internal environment of the battery cell 7. The internal environment formed can be used to accommodate the electrode assembly, electrolyte and other components. The shell 10a and the end cap 10b can be independent components, and an opening can be set on the shell 10a, and the internal environment of the battery cell 7 is formed by covering the opening with the end cap 10b at the opening. Optionally, the end cap 10b and the shell 10a can also be integrated. Specifically, the end cap 10b and the shell 10a can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 10a, the end cap 10b is covered with the shell 10a. The shell 10a can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 10a can be determined according to the specific shape and size of the electrode assembly. The shell 10a can be made of various materials. For example, the shell 10a can be but is not limited to being made of metal or non-metal materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0152] Optionally, the end cap 10b may be detachably connected to the housing 10a, or may be integrally provided on the housing 10a. The end cap 10b may be directly connected to the housing 10a, or may be restricted to the housing 10a by other components. As an example, the connection method between the end cap 10b and the housing 10a may be, but is not limited to, welding, riveting, or bonding.

[0153] The second wall 14 is arranged opposite to the end cover 10b. In other words, the second wall 14 can be understood as the bottom wall of the shell 10a. The end cover 10b is located at the top of the battery cell 7. Since the gas itself will gather toward the top of the battery cell 7, the exhaust hole 12 is arranged on the end cover 10b, which helps to improve the gas exhaust efficiency. The second wall 14 is located at the bottom of the battery cell 7, and the injection hole 11 is arranged on the second wall 14. During the injection process of the battery cell 7, the injection equipment injects electrolyte from the bottom of the battery cell 7. Due to the effect of gravity, even if the electrolyte leaks, the electrolyte will drip directly toward the ground instead of adhering to the battery cell 7, thereby effectively reducing the risk of electrolyte contamination of the battery cell 7.

[0154] In this way, the above technical solution can not only improve the gas exhaust efficiency in the processing steps of the battery cell 7 that require exhaust, but also effectively reduce the risk of electrolyte contamination of the battery cell 7 in the liquid injection process of the battery cell 7.

[0155] In some embodiments, the first valve 20 includes a first main body 21 and a first core 22. The first main body 21 includes a first port 211 and a second port 212 that are connected. The first port 211 is connected to the external space, and the second port 212 is connected to the internal space. The first core 22 is disposed in the first main body 21. The first core 22 is configured to be opened when subjected to pressure so that the first port 211 and the second port 212 are connected, and to be isolated from the first port 211 and the second port 212 when not subjected to pressure.

[0156] Exemplarily, when the battery cell 7 undergoes a liquid injection process, the first port 211 mainly functions as an inlet path for the electrolyte to be transported from the liquid injection device located in the external space of the shell 10 to the internal space of the shell 10, while the second port 212 is used to guide the electrolyte to enter the internal space of the shell 10. When the battery cell 7 undergoes a baking process, the second port 212 mainly functions as an inlet path for water vapor to enter the first valve 20 from the internal space of the shell 10, while the first port 211 is used to guide the water vapor to be discharged to the external space of the shell 10. When the battery cell 7 undergoes a formation process, the second port 212 mainly functions as an inlet path for gas to enter the first valve 20 from the internal space of the shell 10, while the first port 211 is used to guide the gas to be discharged to the external space of the shell 10.

[0157] Optionally, the first core portion 22 may be detachably connected to the first main body portion 21, or may be integrally provided on the first main body portion 21; the first core portion 22 may be directly connected to the first main body portion 21, or may be restricted on the first main body portion 21 by other components. The first core portion 22 and the first main body portion 21 may both be made of, but not limited to, metal or non-metal materials, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc.

[0158] As an example, the liquid injection process of the battery cell 7 is taken as an example for explanation. The first core part 22 is designed to be able to dynamically respond to external pressure to realize the push-type valve opening function. Under normal conditions, the first core part 22 is not subjected to external force, and the first core part 22 remains in a closed state, so that the first port 211 and the second port 212 are in an isolated state, thereby cutting off the interaction between the external environment and the inside of the battery cell 7. When the battery cell 7 needs to be injected, pressure is applied to the first core part 22 to open the first core part 22 so that the first port 211 and the second port 212 are connected, so that the injection equipment can inject electrolyte into the inside of the battery cell 7 through the first valve 20. After the injection of the battery cell 7 is completed, the external pressure acting on the first core part 22 is removed, and the first core part 22 automatically returns to its position and remains in a closed state by relying on a preset recovery mechanism, and the first port 211 and the second port 212 are cut off again, thereby cutting off the interaction between the external environment and the inside of the battery cell 7 again.

[0159] For example, the pressure on the first core portion 22 may be applied by, but is not limited to, manual operation, mechanical operation, electrical signal, or instruction of an automated control system.

[0160] Optionally, the first core portion 22 may be, but is not limited to, a plate-like structure, a block-like structure, or a spherical structure, etc. The specific shape and size of the first core portion 22 may be set according to the specific structure inside the first main body portion 21 .

[0161] Optionally, the first core portion 22 and the first main body portion 21 may be made of, but not limited to, metal or non-metal materials, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc. Further, the first core portion 22 and the first main body portion 21 may be made of the same material to simplify the manufacturing process and help reduce costs.

[0162] As an example, the first core part 22 is movably arranged relative to the first main body part 21, so that the first core part 22 has an initial position and a valve opening position. When the first core part 22 is not subjected to pressure, the first core part 22 is located at the initial position, which can block the first port 211 and the second port 212, so that the first port 211 and the second port 212 are not connected; when pressure acts on the first core part 22, the first core part 22 is located at the valve opening position, canceling the blocking of the first port 211 and the second port 212, so that the first port 211 and the second port 212 are connected.

[0163] As another example, the first core part 22 includes a first valve port 20 and a first sealing member, the first port 211 and the second port 212 can be connected through the first valve port 20, and the first sealing member can be movably arranged to open or close the first valve port 20. When the first core part 22 is not subjected to pressure, the first valve port 20 is closed, and the passage between the first port 211 and the second port 212 can be cut off; when pressure acts on the first core part 22, the first valve port 20 is opened, so that the first port 211 and the second port 212 can be connected through the first valve port 20.

[0164] The above technical solution sets the first valve 20 as a push-type valve. During the opening and closing of the first valve 20, the first core portion 22 moves in a direction close to the internal space of the housing 10, which can significantly reduce the requirements for the external operating space of the battery cell 7 and help adapt to more processing procedures of the battery cell 7. In addition, the first valve 20 is opened by pressing, which makes the operation more convenient and can effectively improve the production efficiency of the battery cell 7.

[0165] In some optional embodiments, the second valve 30 may be configured as a push-type valve having the same or similar structure as the first valve 20 .

[0166] In some embodiments, the first valve 20 further includes a first elastic body 23 , which connects the first main body 21 and the first core 22 , and applies a force to the first core 22 in a direction close to the first port 211 .

[0167] Exemplarily, the first elastic body 23 is used to provide a preset force for the first core part 22. The first elastic body 23 applies a force to the first core part 22 in a direction close to the first port 211 through its inherent elastic force, so that the first core part 22 can abut against the junction of the first port 211 and the second port 212 when the first core part 22 is not subjected to external pressure, so as to isolate the first port 211 and the second port 212. When the external pressure applied to the first core part 22 exceeds the elastic force applied by the first elastic body 23 to the first core part 22, the first core part 22 moves in a direction away from the first port 211, so that the first port 211 and the second port 212 are connected.

[0168] The first elastic body 23 can be detachably connected to the first main body 21 and the first core 22, or can be integrally provided on the first main body 21 and the first core 22. The first elastic body 23 can be directly connected to the first main body 21 and the first core 22, or can be restricted on the first main body 21 and the first core 22 by other components. As an example, the connection method between the first elastic body 23 and the first main body 21 and the connection method between the first elastic body 23 and the first core 22 can be, but not limited to, bolt connection, welding, riveting or clamping, etc.

[0169] Optionally, the first elastic body 23 may be, but is not limited to, a spring, a rubber strip, or a memory alloy, etc. In addition, the first elastic body 23 with different elastic coefficients may be selected, or the preload force of the first elastic body 23 may be adjusted to set different switch sensitivities of the first valve 20 for better applicability.

[0170] The above technical solution sets the first elastomer 23 to provide a preset force for the first core portion 22. It not only has a simple structure, which is beneficial to reducing the preparation cost of the first valve 20, but also can flexibly adjust the shape, size and material of the first elastomer 23 according to different application environments and requirements, thereby helping to improve the design flexibility and applicability of the first valve 20.

[0171] In some embodiments, the first elastic body 23 is disposed on a side of the first core portion 22 facing away from the first port 211 .

[0172] Exemplarily, the first elastomer 23 applies a force on the first core portion 22 in a direction close to the first port 211 through its own elastic deformation. When the first elastomer 23 is arranged on the side of the first core portion 22 facing away from the first port 211, the first elastomer 23 will always be in a compressed state to provide thrust for the first core portion 22.

[0173] In this way, the first elastomer 23 is in a compressed state so that the volume of the first elastomer 23 is relatively small, thereby reducing the occupancy rate of the first elastomer 23 in the internal space of the first valve 20, thereby freeing up more space inside the first valve 20 for realizing functions such as transporting electrolyte or gas during the processing of the battery cell 7, thereby improving the production efficiency of the battery cell 7.

[0174] In some embodiments, the first main body 21 further includes a cavity 213, and the cavity 213 communicates with the first port 211 and the second port 212. The first core 22 includes a body 221 and a convex portion 222 connected to each other, the convex portion 222 protrudes from a side surface of the body 221 close to the first port 211, the body 221 is disposed in the cavity 213, and a side surface of the body 221 close to the first port 211 abuts against the first main body 21, and at least a portion of the convex portion 222 is accommodated in the first port 211.

[0175] Exemplarily, the main function of the convex portion 222 is to block the first port 211. The first step structure formed between the convex portion 222 and the body 221 and the second step structure formed between the first port 211 and the cavity 213 abut against each other to form an effective sealing path, thereby further improving the sealing performance of the first valve 20 in the closed state. Part of the convex portion 222 may be accommodated in the first port 211, or all of the convex portion 222 may be accommodated in the first port 211.

[0176] The protrusion 222 can be detachably connected to the body 221, or can be integrally provided on the body 221. The first elastic body 23 can be directly connected to the body 221, or can be restricted to the body 221 by other components. As an example, the connection between the first elastic body 23 and the body 221 can be, but is not limited to, bolt connection, welding, riveting or clamping.

[0177] Optionally, the body 221 and the convex portion 222 are integrally formed. On the one hand, there is no need to connect the body 221 and the convex portion 222 through an additional connection process, which simplifies the manufacturing process. On the other hand, compared with connecting the body 221 and the convex portion 222 through an additional connection process, the body 221 and the convex portion 222 in an integral structure have a higher connection firmness.

[0178] The above technical solution can improve the sealing performance when the first valve 20 is in a closed state, thereby reducing the influence of external environmental factors on the battery cell 7 during the production process, so as to further improve the production quality.

[0179] In some embodiments, the second valve 30 includes a second body portion 31 and a second core portion 32. The second body portion 31 includes a third port 311 and a fourth port 312 that are connected. The third port 311 is connected to the internal space. The second core portion 32 is disposed in the second body portion 31. A portion of the second core portion 32 passes through the fourth port 312 and extends out of the housing 10. The second core portion 32 is provided with a channel 321, which is connected to the external space. The second core portion 32 is configured to be opened when subjected to a pulling force so that the third port 311 and the channel 321 are connected, and the third port 311 and the channel 321 can be isolated when not subjected to a pulling force.

[0180] Exemplarily, the fourth port 312 is used to avoid the second core portion 32 so that part of the second core portion 32 can pass through the fourth port 312 and extend out of the shell 10. The second core portion 32 located in the external space of the shell 10 is used to facilitate the operator or equipment to grab the second core portion 32 to apply tension to it. When the battery cell 7 undergoes the liquid injection process, the main function of the channel 321 is to serve as an inlet path for the electrolyte to be transported from the liquid injection equipment located in the external space of the shell 10 to the internal space of the shell 10, and the third port 311 is used to guide the electrolyte to enter the internal space of the shell 10. When the battery cell 7 undergoes the baking process, the main function of the third port 311 is to serve as an inlet path for water vapor to enter the first valve 20 from the internal space of the shell 10, and the channel 321 is used to guide the water vapor to be discharged to the external space of the shell 10. When the battery cell 7 is undergoing a formation process, the third port 311 mainly serves as an inlet path for gas to enter the first valve 20 from the inner space of the housing 10 , while the channel 321 is used to guide the gas to be discharged to the outer space of the housing 10 .

[0181] Optionally, the second core part 32 may be detachably connected to the second main body part 31, or may be integrally provided on the second main body part 31; the second core part 32 may be directly connected to the second main body part 31, or may be restricted on the second main body part 31 by other components. The second core part 32 and the second main body part 31 may both be made of, but not limited to, metal or non-metal materials, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc.

[0182] As an example, the formation process of the battery cell 7 is taken as an example for explanation. The second core part 32 is designed to be able to dynamically respond to external tension to realize the pull-out valve opening function. Under normal conditions, the second core part 32 is not subjected to external force, and the second core part 32 remains in a closed state, so that the third port 311 and the channel 321 are in an isolated state, thereby cutting off the interaction between the external environment and the inside of the battery cell 7. When the battery cell 7 needs to be formed, a pulling force is applied to the second core part 32 to open the second core part 32, so that the third port 311 and the channel 321 are connected, so that the gas generated by the formation in the internal space of the shell 10 can be discharged to the external space of the shell 10 through the second valve 30. After the formation of the battery cell 7 is completed, the external tension acting on the second core part 32 is removed, and the second core part 32 automatically returns to the closed state by relying on the preset recovery mechanism, and the third port 311 and the channel 321 are cut off again, thereby cutting off the interaction between the external environment and the inside of the battery cell 7 again.

[0183] For example, the pressure on the second core portion 32 may be applied by, but is not limited to, manual operation, mechanical operation, electrical signal, or instruction of an automated control system.

[0184] Optionally, the second core portion 32 may be, but is not limited to, a plate-like structure, a block-like structure or a spherical structure, etc. The specific shape and size of the second core portion 32 may be set according to the specific structure inside the second main body portion 31 .

[0185] Optionally, the second core portion 32 and the second main body portion 31 may be made of, but not limited to, metal or non-metal materials, for example, the metal material may be steel, iron, copper, copper alloy, aluminum or aluminum alloy, etc.; the non-metal material may be polyethylene, polypropylene or polyvinyl chloride, etc. Further, the second core portion 32 and the second main body portion 31 may be made of the same material to simplify the manufacturing process and help reduce costs.

[0186] As an example, the second core part 32 is movably arranged relative to the second main body part 31, so that the second core part 32 has an initial position and a valve opening position. When the second core part 32 is not subjected to a tensile force, the second core part 32 is located at the initial position, and can block the third port 311 and the channel 321, so that the third port 311 and the channel 321 are not connected; when a tensile force acts on the second core part 32, the second core part 32 is located at the valve opening position, and the blocking of the third port 311 and the channel 321 is cancelled, so that the third port 311 and the channel 321 are connected.

[0187] As another example, the second core part 32 includes a second valve 30 port and a second sealing member, the third port 311 and the channel 321 can be connected through the second valve 30 port, and the second sealing member can be movably arranged to open or close the second valve 30 port. When the second core part 32 is not subjected to a tensile force, the second valve 30 port is closed, and the passage between the third port 311 and the channel 321 can be cut off; when a tensile force is applied to the second core part 32, the second valve 30 port is opened, so that the third port 311 and the channel 321 can be connected through the second valve 30 port.

[0188] The above technical solution configures the second valve 30 as a pull-out valve. During the switching of the second valve 30, the second core portion 32 moves in a direction away from the internal space of the outer shell 10. This can reduce the risk of the second core portion 32 falling off and into the internal space of the outer shell 10 during the movement, thereby helping to improve the reliability of the battery cell 7.

[0189] In some optional embodiments, the first valve 20 may be configured as a pull-out valve having the same or similar structure as the second valve 30 .

[0190] In some optional embodiments, the first valve 20 is disposed at the injection hole 11 and is configured as a push-type valve to facilitate the injection operation of the injection device, and the second valve 30 is disposed at the exhaust hole 12 and is configured as a pull-type valve to facilitate the exhaust operation.

[0191] In some embodiments, the second valve 30 further includes a second elastic body 33 , which connects the second body portion 31 and the second core portion 32 , and applies a force to the second core portion 32 in a direction away from the fourth port 312 .

[0192] Exemplarily, the second elastic body 33 is used to provide a preset force for the second core part 32. The second elastic body 33 applies a force to the second core part 32 in a direction away from the fourth port 312 through its inherent elastic force, so that the second core part 32 can block the third port 311 without being subjected to an external tensile force, so as to isolate the third port 311 from the channel 321. When the external tensile force applied to the second core part 32 exceeds the elastic force applied by the second elastic body 33 to the second core part 32, the second core part 32 moves in a direction close to the fourth port 312 to cancel the blockage of the third port 311, so as to connect the third port 311 with the channel 321.

[0193] The second elastic body 33 can be detachably connected to the second main body 31 and the second core 32, or can be integrally provided on the second main body 31 and the second core 32. The second elastic body 33 can be directly connected to the second main body 31 and the second core 32, or can be restricted on the second main body 31 and the second core 32 by other components. As an example, the connection between the second elastic body 33 and the second main body 31 and the connection between the second elastic body 33 and the second core 32 can be, but are not limited to, bolt connection, welding, riveting or clamping.

[0194] Optionally, the second elastic body 33 may be, but is not limited to, a spring, a rubber strip or a memory alloy, etc. In addition, the second elastic body 33 with different elastic coefficients may be selected, or the preload force of the second elastic body 33 may be adjusted to set different switch sensitivities of the second valve 30 for better applicability.

[0195] The above technical solution provides a preset force for the second core portion 32 by setting a second elastomer 33. This not only has a simple structure, which is beneficial to reducing the preparation cost of the second valve 30, but also can flexibly adjust the shape, size and material of the second elastomer 33 according to different application environments and requirements, thereby facilitating improving the design flexibility and applicability of the second valve 30.

[0196] In some embodiments, the second elastic body 33 is disposed on a side of the second core portion 32 close to the fourth port 312 .

[0197] Exemplarily, the second elastomer 33 applies a force on the second core portion 32 in a direction away from the fourth port 312 through its own elastic deformation. When the second elastomer 33 is arranged on a side of the second core portion 32 close to the fourth port 312, the second elastomer 33 will always be in a compressed state to provide thrust for the second core portion 32.

[0198] In this way, the second elastomer 33 is in a compressed state, which can make the volume of the second elastomer 33 relatively small, thereby reducing the occupancy rate of the second elastomer 33 in the internal space of the second valve 30, thereby freeing up more space inside the second valve 30 for realizing functions such as transporting electrolyte or gas during the processing of the battery cell 7, so as to improve the production efficiency of the battery cell 7.

[0199] In some embodiments, the second valve 30 further includes an anti-slip member 34 connected to a portion of the second core portion 32 extending out of the housing 10 .

[0200] Exemplarily, the second core portion 32 located in the outer space of the housing 10 is used to facilitate an operator or device to grasp the second core portion 32 to apply a pulling force thereto. The anti-slip member 34 may be detachably connected to the second core portion 32, or may be integrally provided on the second core portion 32. The anti-slip member 34 can increase the friction coefficient of the portion of the second core portion 32 extending out of the housing 10, so as to reduce the risk of the operator or device slipping off the second core portion 32 after grasping it.

[0201] The anti-slip member 34 may be directly connected to the second core portion 32, or may be restricted on the second core portion 32 by other components. As an example, the connection between the anti-slip member 34 and the second core portion 32 may be, but is not limited to, bolt connection, welding, riveting or clamping.

[0202] As an example, the anti-slip member 34 may be a concave-convex structure provided on the outer surface of the second core portion 32 ; the anti-slip member 34 may also be an anti-slip pad or an anti-slip coating provided on the outer surface of the second core portion 32 .

[0203] Optionally, the anti-slip member 34 may be made of, but is not limited to, rubber, polyvinyl chloride, polyurethane or other materials.

[0204] The above technical solution sets an anti-slip part 34, which can increase the friction coefficient of the part of the second core part 32 extending out of the outer shell 10, so as to reduce the risk of the second core part 32 slipping after being grasped by an operator or equipment, thereby improving the reliability of the second valve 30.

[0205] According to some embodiments of the present application, the present application also provides a battery, comprising a battery cell 7 of any of the above schemes.

[0206] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery cell 7 according to any of the above schemes, and the battery cell 7 is used to provide electrical energy.

[0207] In order to better understand the battery cell 7 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned battery cell 7 in actual application is provided here for illustration.

[0208] The embodiment of the present application provides a battery cell 7 , which includes a housing 10 , a first valve 20 and a second valve 30 , wherein the first valve 20 and the second valve 30 are both disposed on the housing 10 .

[0209] The housing 10 includes an end cover 10b and a shell 10a. The shell 10a has an opening. The end cover 10b covers the opening. The end cover 10b is provided with an exhaust hole 12. A liquid injection hole 11 is provided on the wall of the shell 10a opposite to the end cover 10b. The first valve 20 is provided at the liquid injection hole 11, and the second valve 30 is provided at the exhaust hole 12.

[0210] The first valve 20 includes a first main body 21, a first core 22 and a first elastic body 23. The first main body 21 includes a first port 211 and a second port 212 that are connected. The first port 211 is connected to the external space, and the second port 212 is connected to the internal space. The first core 22 is disposed in the first main body 21. The first elastic body 23 connects the first main body 21 and the first core 22. The first elastic body 23 applies a force to the first core 22 in a direction close to the first port 211. The first core 22 is configured to be opened when subjected to pressure so that the first port 211 and the second port 212 are connected, and to be isolated from the first port 211 and the second port 212 when not subjected to pressure.

[0211] The second valve 30 includes a second main body 31, a second core 32, and a second elastic body 33. The second main body 31 includes a third port 311 and a fourth port 312 that are connected. The third port 311 is connected to the internal space. The second core 32 is arranged in the second main body 31. A portion of the second core 32 passes through the fourth port 312 and extends out of the housing 10. The second core 32 is provided with a channel 321, which is connected to the external space. The second elastic body 33 connects the second main body 31 and the second core 32. The second elastic body 33 applies a force to the second core 32 in a direction away from the fourth port 312. The second core 32 is configured to be opened when subjected to a pulling force so that the third port 311 and the channel 321 are connected, and the third port 311 and the channel 321 can be isolated when not subjected to a pulling force.

[0212] The above technical solution of the present application can open the first valve 20 and / or the second valve 30 when the battery cell 7 is undergoing a processing procedure that requires the internal space of the shell 10 to be connected with the external space of the shell 10 to complete the relevant operation, so as to provide operating conditions for the processing procedure of the battery cell 7; when the battery cell 7 is not being processed or is undergoing a processing procedure that does not require the internal space of the shell 10 to be connected with the external space of the shell 10 to complete the relevant operation, the first valve 20 and / or the second valve 30 are closed to isolate the interaction between the external environment and the inside of the battery cell 7, effectively reducing the influence of the external environment on the internal structure and components of the battery cell 7 due to the interaction between the external environment and the internal space of the shell 10 through the injection hole 11 and the exhaust hole 12, thereby facilitating the improvement of production quality. At the same time, since the influence of the external environment on the battery cell 7 during the production process is reduced, the control standard of the external environment can be lowered or the control of the external environment can be cancelled, thereby facilitating the reduction of production costs.

[0213] In addition, the structures of the first valve 20 and the second valve 30 can be designed differently according to the different structures of the injection hole 11 and the exhaust hole 12, so as to better meet the process requirements of injection and exhaust, thereby facilitating further improving the production quality.

[0214] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0215] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The outer shell is provided with a liquid injection hole and an exhaust hole; A first valve and a second valve, one of the first valve and the second valve is arranged at the injection hole, and the other of the first valve and the second valve is arranged at the exhaust hole, and the first valve and the second valve are both configured to be able to switch between the internal space of the shell and the external space of the shell.

2. The battery cell according to claim 1, characterized in that: The housing includes a first wall and a second wall, the exhaust hole is arranged on the first wall, and the injection hole is arranged on the second wall.

3. The battery cell according to claim 2, characterized in that: The first wall and the second wall are arranged opposite to each other.

4. The battery cell according to claim 2, characterized in that: The housing comprises an end cover and a shell, the shell has an opening, the end cover covers the opening, and the end cover is configured as the first wall; The housing includes the second wall, and the second wall is arranged opposite to the end cover.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The first valve comprises a first main body and a first core, the first main body comprises a first port and a second port connected to each other, the first port is connected to the external space, and the second port is connected to the internal space; The first core part is disposed in the first main body part, and is configured to be opened when subjected to pressure so as to connect the first port and the second port, and to be isolated from the first port and the second port when not subjected to pressure.

6. The battery cell according to claim 5, characterized in that: The first valve further includes a first elastic body, the first elastic body connects the first main body portion and the first core portion, and the first elastic body applies a force to the first core portion in a direction approaching the first port.

7. The battery cell according to claim 6, characterized in that: The first elastic body is arranged on a side of the first core portion facing away from the first port.

8. The battery cell according to claim 5, characterized in that: The first main body also includes a cavity, and the cavity communicates with the first port and the second port; The first core portion includes a connected main body and a convex portion, the convex portion protrudes from a side surface of the main body close to the first port, the main body is arranged in the cavity, and a side surface of the main body close to the first port abuts against the first main body portion, and at least a portion of the convex portion is accommodated in the first port.

9. The battery cell according to any one of claims 1 to 4, characterized in that: The second valve comprises a second main body and a second core body, the second main body comprises a third port and a fourth port connected to each other, the third port is connected to the internal space; The second core portion is arranged in the second main body portion, and a part of the second core portion passes through the fourth port and extends out of the outer shell. The second core portion is provided with a channel, and the channel is connected to the external space. The second core portion is configured to be able to open when subjected to tension so that the third port and the channel are connected, and to be able to isolate the third port and the channel when not subjected to tension.

10. The battery cell according to claim 9, characterized in that: The second valve further includes a second elastic body, the second elastic body connects the second main body portion and the second core portion, and the second elastic body applies a force to the second core portion in a direction away from the fourth port.

11. The battery cell according to claim 10, characterized in that: The second elastic body is arranged on a side of the second core portion close to the fourth port.

12. The battery cell according to claim 9, characterized in that: The second valve further includes an anti-slip member connected to a portion of the second core portion extending out of the housing.

13. A battery, characterized in that: Comprising a battery cell as described in any one of claims 1-12.

14. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12, wherein the battery cell is used to provide electrical energy.

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