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

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The use performance of the battery monomer can be improved. The battery monomer comprises a shell, an electrode assembly and a first sealing structure, wherein a liquid injection hole penetrating through a first wall along a first direction is formed in the first wall of the shell; the first sealing structure is in sealing connection with the liquid injection hole; the liquid injection hole comprises a first hole section and a second hole section, the first hole section comprises an inclined section, and the inclined section is obliquely arranged towards the interior of the second hole section in the first direction; the first sealing structure comprises a first main body part and a first extension part which are connected with each other, the first extension part is located on the side, away from the electrode assembly, of the first main body part, and at least part of the surface, facing the inclined section, of the first extension part abuts against at least part of the surface, away from the electrode assembly, of the inclined section. The first direction is a direction along the thickness of the first wall and facing the electrode assembly.

Description

TECHNICAL FIELD

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

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

[0003] In the assembly process of the battery monomer, it is usually necessary to seal the injection hole using a sealing structure after injection is completed. In the case of applying a large pressure to the sealing structure, the sealing structure may fall into the interior of the battery monomer, affecting the use performance and sealing performance of the battery monomer. Therefore, how to reduce the risk of the sealing structure falling into the interior of the battery monomer during the assembly process to improve the use performance of the battery monomer has become a technical problem to be solved in the field. UTILITY MODEL CONTENT

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

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell comprising a first wall, the first wall being provided with an injection hole penetrating through the first wall along a first direction; an electrode assembly accommodated in the interior of the shell; a first sealing structure in sealing connection with the injection hole; wherein the injection hole comprises a first hole section and a second hole section distributed along the first direction, the first hole section being located on the side of the second hole section away from the electrode assembly, the aperture of the first hole section being greater than the aperture of the second hole section, the first hole section comprising an inclined section, the inclined section being inclinedly arranged along the first direction towards the interior of the second hole section; the first sealing structure comprising a first main body portion and a first extension portion connected with each other, the first extension portion being located on the side of the first main body portion away from the electrode assembly, at least part of the first main body portion being accommodated in the second hole section and in sealing connection with the second hole section, at least part of the surface of the first extension portion towards the inclined section abutting against at least part of the surface of the inclined section away from the electrode assembly, the minimum dimension of the first extension portion in the direction perpendicular to the first direction being greater than or equal to the maximum dimension of the first main body portion in the direction perpendicular to the first direction, the first direction being the direction along the thickness of the first wall and towards the electrode assembly.

[0006] In the embodiments of the present application, the liquid injection hole is provided with a first hole section and a second hole section distributed along the first direction, the first hole section is located on the side of the second hole section away from the electrode assembly, the aperture of the first hole section is larger than that of the second hole section, and the first hole section comprises an inclined section which is arranged to be inclined towards the inside of the second hole section along the first direction. The first sealing structure is in sealing connection with the liquid injection hole. The first direction is the direction along the thickness of the first wall and towards the electrode assembly. In the process of injecting electrolyte into the inside of the battery monomer, the electrolyte can quickly enter the inside of the battery monomer through the liquid injection hole, reducing the residue of electrolyte at the inner wall of the liquid injection hole, and reducing the risk of corrosion of the first sealing structure. In addition, the first sealing structure is provided with a first main body and a first extension which are connected to each other. The first extension is located on the side of the first main body away from the electrode assembly. At least part of the first main body is accommodated in the second hole section and is in sealing connection with the second hole section. At least part of the surface of the first extension towards the inclined section abuts against at least part of the surface of the inclined section away from the electrode assembly. The first extension and the inclined section cooperate with each other to limit the position of the first sealing structure, thereby reducing the risk of the first sealing structure falling off or falling into the inside of the battery monomer, and improving the assembly performance and use performance of the battery monomer.

[0007] In some embodiments, along the first direction, the size of the first main body in the direction perpendicular to the first direction gradually decreases.

[0008] In the embodiments of the present application, along the first direction, the size of the first main body in the direction perpendicular to the first direction is gradually reduced, so as to smoothly accommodate part of the first sealing structure inside the second hole section of the liquid injection hole, effectively reducing the force applied to the first sealing structure during assembly, thereby improving the assembly performance and use performance of the battery monomer.

[0009] In some embodiments, the angle a1 of the surface of the inclined section away from the electrode assembly with respect to the first direction satisfies: 0° < a1 < 90°.

[0010] In the embodiments of the present application, the angle a1 of the surface of the inclined section away from the electrode assembly with respect to the first direction is set to: 0° < a1 < 90°, so as to reduce the residue of electrolyte at the inner wall of the liquid injection hole when injecting electrolyte into the inside of the battery monomer, reduce the risk of corrosion of the first sealing structure, and at the same time, the first extension and the inclined section can cooperate with each other to limit the position of the first sealing structure at the liquid injection hole, that is, the efficiency of injecting electrolyte into the battery monomer and the limiting effect on the first sealing structure are taken into account, thereby reducing the risk of the first sealing structure falling off or falling into the inside of the battery monomer, and improving the assembly performance and use performance of the battery monomer.

[0011] In some embodiments, the first body part and the first extension part are integrally formed. In this way, in the embodiments of the present application, by setting the first body part and the first extension part to be integrally formed, the sealing performance and assembly performance of the first sealing structure can be effectively improved, and the structural strength of the first sealing structure can be improved, thereby improving the use performance of the battery monomer and facilitating reduction of the processing and manufacturing costs of the battery monomer.

[0012] In some embodiments, a surface of the first sealing structure on a side away from the electrode assembly is lower than a surface of the first wall on a side away from the electrode assembly, or the surface of the first sealing structure on the side away from the electrode assembly is flush with the surface of the first wall on the side away from the electrode assembly.

[0013] In the embodiments of the present application, by setting the surface of the first sealing structure on the side away from the electrode assembly to be lower than the surface of the first wall on the side away from the electrode assembly, or setting the surface of the first sealing structure on the side away from the electrode assembly to be flush with the surface of the first wall on the side away from the electrode assembly, the collision or wear of the first sealing structure during assembly or movement of the battery monomer can be reduced, the sealing performance of the first sealing structure can be improved, and thus the use performance of the battery monomer can be improved.

[0014] In some embodiments, the battery monomer further comprises a second sealing structure, at least part of the second sealing structure is accommodated in the liquid injection hole and is in sealing connection with the liquid injection hole, the second sealing structure comprises a second body part and a first protruding part connected to each other, the first protruding part is located on a side of the second body part facing the electrode assembly and extends in a direction facing the electrode assembly, wherein the first sealing structure comprises a first groove with an opening away from the electrode assembly, at least part of the first protruding part is accommodated in the first groove, and at least part of a surface of the first protruding part facing the electrode assembly abuts at least part of a surface of the first groove facing the inside of the first groove.

[0015] In the embodiments of the present application, by setting the second sealing structure in the battery monomer, the first protruding part of the second sealing structure is located on a side of the second body part facing the electrode assembly and extends in a direction facing the electrode assembly, and the first sealing structure comprises a first groove with an opening away from the electrode assembly, at least part of the first protruding part is accommodated in the first groove, and at least part of a surface of the first protruding part facing the electrode assembly abuts at least part of a surface of the first groove facing the inside of the first groove, so as to effectively improve the limiting effect on the first sealing structure, and at the same time, the positioning effect on the second sealing structure is achieved, so as to facilitate assembly of the second sealing structure, thereby improving the use performance of the battery monomer.

[0016] In some embodiments, the first recess gradually decreases in size perpendicular to the first direction.

[0017] In some embodiments, the at least part of the surface of the first protrusion facing the electrode assembly abuts against the at least part of the surface of the first recess facing the interior of the first recess.

[0018] In some embodiments, the at least part of the surface of the first protrusion facing the electrode assembly abuts against the entire surface of the first recess facing the interior of the first recess.

[0019] In some embodiments, the at least part of the surface of the first protrusion facing the electrode assembly abuts against the entire surface of the first recess facing the interior of the first recess.

[0020] In some embodiments, the injection hole further comprises a third hole section located on the side of the first hole section away from the electrode assembly, and the second sealing structure is partially accommodated in the third hole section, and the aperture of the third hole section is larger than the aperture of the second hole section.

[0021] In some embodiments, the injection hole further comprises a third hole section located on the side of the first hole section away from the electrode assembly, and the second sealing structure is partially accommodated in the third hole section, and the aperture of the third hole section is larger than the aperture of the second hole section.

[0022] In some embodiments, the first hole section further comprises a flat section, and the surface of the flat section away from the electrode assembly is perpendicular to the first direction, and the flat section is located between the third hole section and the inclined section, and the first sealing structure further comprises a second extension connected to the side of the first extension away from the first main body section and extending in the direction away from the geometric center of the first sealing structure, and the at least part of the surface of the second extension facing the electrode assembly abuts against the at least part of the surface of the flat section away from the electrode assembly.

[0023] In the embodiments of the present application, the flat section is located between the third hole section and the inclined section, and the first sealing structure further comprises a second extension part connected to a side of the first extension part away from the first main body part and extending away from the geometric center of the first sealing structure, at least part of a surface of the second extension part abutting at least part of a surface of the flat section away from the electrode assembly, so as to further improve the limiting effect on the first sealing structure, effectively reduce the risk of the first sealing structure falling off or falling into the interior of the battery monomer, and thus improve the assembly performance and use performance of the battery monomer.

[0024] In some embodiments, the second sealing structure is fixedly connected with the first sealing structure, and a projection of the second sealing structure covers a projection of the first sealing structure in a plane perpendicular to the first direction.

[0025] In the embodiments of the present application, the second sealing structure is fixedly connected with the first sealing structure, and a projection of the second sealing structure covers a projection of the first sealing structure in a plane perpendicular to the first direction, so as to further improve the limiting effect on the first sealing structure, further reduce the risk of the first sealing structure falling off or falling into the interior of the battery monomer, and thus improve the assembly performance and use performance of the battery monomer. Meanwhile, the fixed connection of the second sealing structure with the first sealing structure can improve the assembly efficiency of the first sealing structure and the second sealing structure relative to the liquid injection hole.

[0026] In some embodiments, the first extension part comprises a first through hole penetrating the first extension part along the first direction, the first main body part comprises a second groove with an opening away from the electrode assembly, the first through hole and the second groove are in communication to form the first groove, the first protruding part comprises a first sub-protruding part and a second sub-protruding part connected with each other, the second sub-protruding part is located on a side of the first sub-protruding part facing the electrode assembly, at least part of the first sub-protruding part is accommodated in the first through hole, and at least part of the second sub-protruding part is accommodated in the second groove.

[0027] In the embodiments of the present application, by setting the first extension part to include a first through hole penetrating through the first extension part along the first direction, the first main body part includes a second groove with an opening facing away from the electrode assembly, the first through hole and the second groove are in communication to form the first groove, and the first protrusion part is set to include a first sub-protrusion part and a second sub-protrusion part connected to each other, the second sub-protrusion part is located on the side of the first sub-protrusion part facing the electrode assembly, at least part of the first sub-protrusion part is accommodated in the first through hole, and at least part of the second sub-protrusion part is accommodated in the second groove, so as to improve the limiting effect of the first sealing structure, realize the fixed connection between the second sealing structure and the first sealing structure, and improve the assembly efficiency of the first sealing structure and the second sealing structure relative to the liquid injection hole.

[0028] In some embodiments, at least part of the second sub-protrusion part and the inner wall of the second groove are connected by one of the following connection modes: threaded connection, clamping connection or interference connection.

[0029] In the embodiments of the present application, at least part of the second sub-protrusion part and the inner wall of the second groove are set to be connected by one of the following connection modes: threaded connection, clamping connection or interference connection, so as to improve the connection strength between the second sealing structure and the first sealing structure, effectively improve the assembly efficiency of the second sealing structure and the first sealing structure relative to the liquid injection hole, effectively improve the limiting effect of the first sealing structure, reduce the risk of the first sealing structure falling off or falling into the inside of the battery monomer, and improve the assembly performance and use performance of the battery monomer.

[0030] In some embodiments, along the first direction, the size of the second sub-protrusion part is less than or equal to the depth of the second groove.

[0031] In the embodiments of the present application, along the first direction, the size of the second sub-protrusion part is set to be less than or equal to the depth of the second groove, so that the second sub-protrusion part can be accommodated in the second groove, and the part of the surface of the first protrusion part facing the electrode assembly can be attached or directly contacted with the part of the surface of the first main body part facing away from the electrode assembly, thereby improving the connection strength between the first sealing structure and the second sealing structure, facilitating the assembly efficiency of the second sealing structure and the first sealing structure relative to the liquid injection hole, and improving the assembly performance and use performance of the battery monomer.

[0032] In some embodiments, the surface of the second sealing structure facing away from the electrode assembly is lower than the surface of the first wall facing away from the electrode assembly, or the surface of the second sealing structure facing away from the electrode assembly is flush with the surface of the first wall facing away from the electrode assembly.

[0033] In the embodiments of the present application, the surface of the second sealing structure on the side away from the electrode assembly is arranged to be lower than the surface of the first wall on the side away from the electrode assembly, or the surface of the second sealing structure on the side away from the electrode assembly is arranged to be flush with the surface of the first wall on the side away from the electrode assembly, so as to reduce the collision or abrasion of the second sealing structure by the battery monomer during assembly or movement, improve the sealing performance of the second sealing structure, and thus improve the use performance of the battery monomer.

[0034] In a second aspect, a battery device is provided, comprising: a plurality of battery monomers, the battery monomers being the battery monomers in the first aspect or any implementation manner thereof.

[0035] In a third aspect, a power consuming device is provided, comprising the battery device in the first aspect, and the battery device is used to provide electric energy for the power consuming device.

[0036] In some implementation manners, the power consuming device can be a vehicle, a ship, a spacecraft, or the like.

[0037] In a fourth aspect, an energy storage device is provided, comprising the battery device in the second aspect, and the battery device is used to store electric energy for the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0039] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application.

[0040] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application.

[0041] Figure 3 is an exploded structural schematic diagram of a battery monomer provided by an embodiment of the present application.

[0042] Figure 4 is an exploded structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0043] Figure 5 is a sectional schematic diagram of a battery monomer provided by an embodiment of the present application.

[0044] Figure 6 is a partially enlarged sectional schematic diagram of a battery monomer provided by an embodiment of the present application.

[0045] Figure 7 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0046] Figure 8 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0047] Figure 9 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0048] Figure 10 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0049] Figure 11 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0050] Figure 12 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0051] Figure 13 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0052] Figure 14 is a partial enlarged sectional view of a battery cell provided by another embodiment of the present application.

[0053] BRIEF DESCRIPTION OF DRAWINGS 1 - vehicle; 10 - battery device; 20 - battery cell; 30 - controller; 40 - motor; 11 - box body; 111 - first structure; 112 - second structure; 112a - bottom plate; 112b - side plate; 21 - shell; 22 - electrode assembly; 211 - case; 212 - end cover; 213 - pressure relief mechanism; 222 - tab; 222a - positive tab; 222b - negative tab; 214 - electrode terminal; 214a - positive electrode terminal; 214b - negative electrode terminal; 23 - connecting member; 215 - first wall; 216 - liquid injection hole; 217 - first hole section; 218 - second hole section; 2171 - inclined section; 2172 - straight section; 50 - first sealing structure; 510 - first main body portion; 520 - first extension portion; 60 - second sealing structure; 610 - second main body portion; 620 - first protruding portion; 530 - first groove; 219 - third hole section; 540 - second extension portion; 541 - first through hole; 511 - second groove; 621 - first sub-protruding portion; 622 - second sub-protruding portion.

[0054] In the drawings, the drawings are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0056] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0058] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, nor is each necessarily mutually exclusive or alternative to the other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after it.

[0061] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0062] In the present application, "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0063] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0064] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0065] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0067] As an example, the positive electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, surface-treated metals, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] In some embodiments, the positive electrode can adopt a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as the positive electrode, the surface of the foamed metal can not be provided with the positive electrode active material, of course, the positive electrode active material can also be provided. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

[0069] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0070] As an example, the negative current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0072] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0073] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone only one or in combination of two or more.

[0074] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative active material, and of course, can be provided with a negative active material.

[0075] As an example, the negative active material can be filled or / and deposited in the negative current collector.

[0076] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0077] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0078] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0079] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0080] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0081] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be liquid, gel, or solid.

[0082] The liquid electrolyte includes an electrolyte salt and a solvent.

[0083] In some embodiments, the electrolyte can optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive that improves certain properties of the battery cell, such as an additive that improves overcharge / rapid charge performance, an additive that improves high-temperature performance, an additive that improves low-temperature performance, and the like.

[0084] The gel electrolyte includes a polymer as a backbone network, and can be used in combination with an ionic liquid-lithium salt.

[0085] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0086] As an example, the polymer of the polymer solid-state electrolyte can include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, and the like.

[0087] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium-ephosphorus-sulfur, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0088] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0089] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound and a stacked structure.

[0090] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0091] In some embodiments, the electrode assembly is a stacked structure.

[0092] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0093] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0094] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0095] As an example, a plurality of separators can be provided, respectively, between any adjacent positive electrode sheets or negative electrode sheets.

[0096] As an example, the separators can be continuously provided, and can be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0097] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0098] In some embodiments, the electrode assembly can be provided with tabs. The tabs can guide current from the electrode assembly. The tabs include positive tabs and negative tabs.

[0099] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., copper-aluminum composite housing), an aluminum-plastic film, or the like. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the sealing bag is used to encapsulate the electrode assembly and the electrolyte, and the like.

[0100] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), and the like, without particular limitation.

[0101] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the housing.

[0102] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0103] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to design requirements. The threshold value can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell.

[0104] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0105] As an example, the pressure relief mechanism can be provided separately from the housing and connected to the housing.

[0106] As used herein, "actuation" of a pressure relief mechanism refers to the pressure relief mechanism being activated or moved to a state in which the internal pressure and temperature of a battery cell can be released. The movement of the pressure relief mechanism can include, but is not limited to, movement of a component of the pressure relief mechanism to form a venting path, at least a portion of the pressure relief mechanism rupturing, breaking, tearing, or opening, and the like. Upon actuation of the pressure relief mechanism, the high temperature and pressure material inside the battery cell can be expelled as a discharge from the actuated portion. In this manner, the battery cell can be depressurized and cooled in a controlled manner to avoid more severe accidents.

[0107] In some embodiments, the housing is a non-sealed structure, and the pressure relief mechanism can be a through hole for discharging the gas inside the battery cell.

[0108] As used herein, the discharge from a battery cell can include, but is not limited to, electrolyte, dissolved or broken positive and negative electrode sheets, fragments of separators, high temperature and pressure gas generated by reactions, flames, and the like.

[0109] As used herein, a battery device can include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar.

[0110] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0111] As an example, a battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a single module. As an example, a battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0112] In some embodiments, a battery device can be a battery pack including a box and one or more battery cell assemblies received in the box.

[0113] As an example, a battery cell assembly can be a battery module, and the battery cell assembly can be received in the box by fixing the battery module in the box.

[0114] As an example, a battery cell assembly can also be received in the box by directly fixing a plurality of battery cells in the box.

[0115] As an example, the box can include a first box and a second box. The first box and the second box are coupled to form an enclosed space inside the box to receive the battery cell assembly. Here, enclosed refers to covered or closed, which can be sealed or non-sealed. The first box can be a top cover or a bottom plate.

[0116] As an example, the cabinet can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, respectively, so that an enclosed space is formed inside the cabinet to accommodate the battery monomer assembly.

[0117] In some embodiments, the cabinet can be part of a chassis structure of a vehicle. For example, part of the cabinet can be at least part of a floor of the vehicle, or part of the cabinet can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0118] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0119] The embodiments of the present application provide a storage device including one or more battery clusters to improve the voltage and capacity of the storage device. The battery cluster can include a plurality of battery devices connected in series through a busbar component to improve the voltage of the storage device. When the storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the storage device.

[0120] The storage device can be used in a storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the storage device can store electrical energy during a low electricity consumption period, and provide electrical energy to related users or electric devices during a high electricity consumption period. The storage system provided by the embodiments of the present application can be any power system that needs to use a storage device.

[0121] In some embodiments, the storage device is a storage container or a storage cabinet.

[0122] In some embodiments, the storage device can include a cabinet and one or more battery clusters, and the battery clusters are accommodated in the cabinet.

[0123] In some embodiments, the storage device can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0124] As an example, the thermal management module can include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery monomers to each battery device through a pipeline.

[0125] As an example, the master control module can be a battery management unit of the battery cluster, used for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes an auxiliary battery management unit, a fuse module, etc.

[0126] As an example, the general control module can be used as a battery management unit of the energy storage device to monitor and manage the energy storage device. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module, a main battery management unit, an Ethernet and optical fiber conversion module, and the like.

[0127] As an example, the fire control system includes a control panel, a detector, an alarm device, and the like, to detect, alarm, or extinguish the energy storage system.

[0128] As an example, the power distribution device can be used to distribute power to the energy storage device power module.

[0129] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development. At present, in the assembly process of the battery monomer, it is usually necessary to seal the injection hole using a sealing structure after the injection is completed. Under the condition of applying a relatively large pressure to the sealing structure, the sealing structure may fall or slide into the interior of the battery monomer, which is easy to cause the performance of the battery monomer to fail or to cause the phenomenon of swelling, affecting the use performance and sealing performance of the battery monomer. Therefore, how to reduce the risk of the sealing structure falling into the interior of the battery monomer during the assembly process to improve the use performance of the battery monomer has become a technical problem to be solved in the art.

[0130] Therefore, the battery monomer, the battery device, the power utilization device and the energy storage device are provided, the battery monomer comprises: a shell, an electrode assembly and a first sealing structure, the shell comprises a first wall, the first wall is provided with a liquid injection hole penetrating through the first wall along a first direction, the electrode assembly is contained in the inside of the shell, and the first sealing structure is in sealing connection with the liquid injection hole, wherein the liquid injection hole comprises a first hole section and a second hole section distributed along the first direction, the first hole section is located on the side of the second hole section away from the electrode assembly, the aperture of the first hole section is greater than the aperture of the second hole section, the first hole section comprises an inclined section, the inclined section is arranged to be inclined towards the inside of the second hole section along the first direction, the first sealing structure comprises a first main body part and a first extension part connected with each other, the first extension part is located on the side of the first main body part away from the electrode assembly, at least part of the first main body part is contained in the second hole section and is in sealing connection with the second hole section, at least part of the surface of the first extension part towards the inclined section abuts against at least part of the surface of the inclined section away from the electrode assembly, the minimum size of the first extension part in the direction perpendicular to the first direction is greater than or equal to the maximum size of the first main body part in the direction perpendicular to the first direction, and the first direction is the direction along the thickness of the first wall and towards the electrode assembly. In this way, in the embodiment of the present application, by arranging the liquid injection hole to comprise a first hole section and a second hole section distributed along the first direction, the first hole section is located on the side of the second hole section away from the electrode assembly, the aperture of the first hole section is greater than the aperture of the second hole section, and the first hole section comprises an inclined section arranged to be inclined towards the inside of the second hole section along the first direction, the first sealing structure is in sealing connection with the liquid injection hole, the first direction is the direction along the thickness of the first wall and towards the electrode assembly, so that the electrolyte can quickly enter the inside of the battery monomer through the liquid injection hole in the process of injecting the electrolyte into the inside of the battery monomer, the risk of corrosion of the first sealing structure is reduced due to the reduction of the electrolyte residue at the inner wall of the liquid injection hole, and secondly, the first sealing structure is arranged to comprise a first main body part and a first extension part connected with each other, the first extension part is located on the side of the first main body part away from the electrode assembly, at least part of the first main body part is contained in the second hole section and is in sealing connection with the second hole section, at least part of the surface of the first extension part towards the inclined section abuts against at least part of the surface of the inclined section away from the electrode assembly, and the first extension part and the inclined section cooperatively limit the first sealing structure, so as to reduce the risk of the first sealing structure falling off or falling into the inside of the battery monomer, thereby improving the assembly performance and use performance of the battery monomer.

[0131] The technical solutions described in the embodiments of the present application are applicable to various power utilization devices using battery devices.

[0132] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0133] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of electrical equipment.

[0134] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0135] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0136] For example, as shown in FIG. 1, a structural schematic diagram of a battery device 10 according to an embodiment of the present application can include a plurality of battery cells 20. The battery device 10 can further include a box 11 (or a cover) having a hollow structure inside, and the plurality of battery cells 20 can be accommodated in the box 11. For example, the plurality of battery cells 20 can be arranged in the box 11 in parallel, in series, or in a combination of parallel and series connection. Figure 2

[0137] As shown in FIG. 2, the box 11 can include two parts, which are referred to as a first structure 111 and a second structure 112, respectively. The first structure 111 and the second structure 112 can be coupled together. The shapes of the first structure 111 and the second structure 112 can be determined according to the shape of the combination of the plurality of battery cells 20. The first structure 111 and the second structure 112 can each have an opening. For example, the first structure 111 and the second structure 112 can each be a hollow cuboid and have only one face as an opening face. The opening of the first structure 111 and the opening of the second structure 112 can be oppositely arranged, and the first structure 111 and the second structure 112 can be coupled together to form the box 11 having a closed cavity. The second structure 112 can include a bottom plate 112a, a side plate 112b, and a beam. The plurality of battery cells 20 can be arranged in the box 11 formed by the coupling of the first structure 111 and the second structure 112 in parallel, in series, or in a combination of parallel and series connection. Figure 2

[0138] Optionally, the battery device 10 can further include other structures, which will not be described herein. For example, the battery device 10 can further include a current collecting component for realizing the electrical connection between the plurality of battery cells 20, such as parallel connection, series connection, or a combination of parallel and series connection. Specifically, the current collecting component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the current collecting component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can be further led out through the box by a conductive mechanism. Optionally, the conductive mechanism can also belong to the current collecting component.

[0139] According to different power requirements, the number of battery cells 20 can be set to any value. The plurality of battery cells 20 can be connected in series, in parallel, or in a combination of parallel and series connection to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery device 10 can be large, in order to facilitate installation, the battery cells 20 can be arranged in groups, and each group of battery cells 20 can form a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements.

[0140] ​​In the embodiments of the present application, the number of battery monomers 20 can be set to any value according to different power requirements. The plurality of battery monomers 20 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery monomers 20 included in each battery device 10 can be large, in order to facilitate installation, the battery monomers 20 can be arranged in groups, and each group of battery monomers 20 forms a battery module. The number of battery monomers 20 included in the battery module is not limited and can be set according to requirements. The battery device 10 can include a plurality of battery modules, and the battery modules can be connected in series, parallel or mixed connection.

[0141] Figure 3 A structural schematic diagram of the battery monomer 20 provided by an embodiment of the present application is shown, Figure 4 An exploded structural schematic diagram of the battery monomer 20 provided by another embodiment of the present application is shown. As Figure 3 and Figure 4 The battery monomer 20 of the embodiment of the present application can include a shell 21 having a closed containing space and an electrode assembly 22 placed in the containing space in the shell 21. The shell 21 can include a shell body 211 which is a hollow structure having at least one opening and an end cover 212 for being buckled with the shell body 211 to form the shell 21 having a closed containing space.

[0142] It should be understood that the battery monomer 20 in the embodiments of the present application can be a secondary battery, which refers to a battery monomer 20 that can be activated by charging after discharging to continue to be used. Exemplarily, the battery monomer 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0143] The electrode assembly 22 in the embodiments of the present application includes a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery monomer 20, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting and allow the active ions to pass through.

[0144] In some embodiments, the end cover 212 can be a plate-shaped structure for covering the opening of the shell body 211. In other embodiments, the end cover 212 has a similar structure to the shell body 211, i.e. the shell body 211 and the end cover 212 are both hollow structures having one opening, and the two openings are butted to form the shell 21 having a closed containing space.

[0145] It should be understood that if the end cover 212 is a plate structure, the shell 211 can be a hollow structure with one or more ends open. For example, if the shell 211 is a hollow structure with one end open, the end cover 212 can be provided as one; if the shell 211 is a hollow structure with opposite two ends open, the end cover 212 can be provided as two, and the two end covers 212 are respectively covered on the openings of the two ends of the shell 211.

[0146] The shell 21 can be various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, as shown in Figure 3 and Figure 4 illustrated, in the embodiment of the present application, the shell 21 is mainly described as a cuboid structure.

[0147] It should be understood that the end cover 212 of the embodiment of the present application is used to cooperate with the shell 211 to isolate the internal environment of the battery monomer 20 from the external environment. The shape of the end cover 212 can be adapted to the shape of the shell 211, as shown in Figure 3 and Figure 4 illustrated, the shell 211 is a cuboid structure, and the end cover 212 is a rectangular plate structure adapted to the shell 211.

[0148] In some embodiments, the shell 211 can be a hollow structure with at least one end open, and the shape of the end cover 212 can be adapted to the shape of the shell 211. The end cover 212 is used to cover the opening of the shell 211, so that the shell 21 isolates the internal environment of the battery monomer 20 from the external environment. If the shell 211 is a hollow structure with one end open, the end cover 212 can be provided as one.

[0149] The material of the shell 211 of the embodiment of the present application can include one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 212 can also be one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. Among them, the material of the end cover 212 and the material of the shell 211 can be the same or different; the materials of the different walls of the shell 211 can also be the same or different.

[0150] The end cover 212 of the embodiment of the present application can be any wall of the shell 21. For example, the end cover 212 can be the largest wall among the multiple walls included in the shell 21, or the smallest wall, or other walls, which are not limited in the embodiment of the present application. Alternatively, the end cover 212 can also be other structures, for example, the end cover 212 can also be a groove structure with an opening, so as to cover the opening of the shell 211 with the opening of the end cover 212, which is not limited in the embodiment of the present application.

[0151] It should be understood that the battery cell 20 also includes electrode terminals 214. The electrode terminals 214 of the embodiments of the present application are used to electrically connect with the electrode assembly 22 inside the battery cell 20 to output the electric energy of the battery cell 20. As shown in Figure 3 to Figure 4 The battery cell 20 can include at least two electrode terminals 214, which can include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b, the positive electrode terminal 214a being used to electrically connect with the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b being used to electrically connect with the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a can be directly connected with the positive electrode tab 222a, or can be indirectly connected, and the negative electrode terminal 214b can be directly connected with the negative electrode tab 222b, or can be indirectly connected. For example, the positive electrode terminal 214a can be electrically connected with the positive electrode tab 222a through a connecting member 23, and the negative electrode terminal 214b can be electrically connected with the negative electrode tab 222b through a connecting member 23. It should be understood that in the embodiments of the present application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as a tab 222.

[0152] In the embodiments of the present application, the walls of the shell 211 and the walls of the end cover 212 are collectively referred to as the walls of the battery cell 20, wherein for the rectangular parallelepiped battery cell 20 shown in Figure 3 and Figure 4 The walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the combined one or more electrode assemblies 22, for example, the shell 211 can be a hollow rectangular parallelepiped or a square or a cylinder, and one of the faces of the shell 211 has an opening so that the one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow rectangular parallelepiped or a square, one of the planes of the shell 211 is an open plane, i.e., the plane does not have a wall so that the inside and outside of the shell 211 are in communication. When the shell 211 can be a hollow cylinder, the end face of the shell 211 is an open plane, i.e., the end face does not have a wall so that the inside and outside of the shell 211 are in communication. The end cover 212 covers the opening and is connected with the shell 211 to form a closed cavity in which the electrode assembly 22 is placed. The shell 211 is filled with an electrolyte, such as an electrolyte solution.

[0153] In the battery cell 20, the electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20, and according to actual use requirements, the electrode assembly 22 in the shell 211 can be one or multiple. For example, as shown in Figure 4 two electrode assemblies 22 are provided in the battery cell 20. The electrode assembly 22 can be a cylinder, a rectangular parallelepiped, etc., and if the electrode assembly 22 is a cylindrical structure, the shell 211 can also be a cylindrical structure, and if the electrode assembly 22 is a rectangular parallelepiped structure, the shell 211 can also be a rectangular parallelepiped structure.

[0154] In the battery cell 20, the electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20, and the electrode assembly 22 in the housing 211 can be one or multiple according to actual use requirements. For example, as shown in FIG. 1, two electrode assemblies 22 are arranged in the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylinder structure, the housing 211 can also be a cylinder structure, and if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In the embodiments of the present application, the material of the housing 211 can include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc. Figure 4

[0155] The battery cell 20 can also be provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0156] The pressure relief mechanism 213 provided on the battery cell 20 can be various possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism configured to be able to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0157] In some implementations, the battery cell 20 can also be provided with an insulating piece, which is arranged in the accommodation space of the housing 211, and the insulating piece can be a hollow structure with one end or multiple ends forming an opening, and the accommodation space in the hollow structure is used to accommodate the electrode assembly 22 to improve the insulation performance of the battery cell 20.

[0158] Figure 5 A cross-sectional schematic view of the battery cell 20 provided by an embodiment of the present application is shown. Figure 6 A partially enlarged cross-sectional schematic view of the battery cell 20 provided by an embodiment of the present application is shown. Figure 7 A partially enlarged cross-sectional schematic view of the battery cell 20 provided by another embodiment of the present application is shown. For example, Figure 6 The injection hole 216 on the first wall 215 in the battery cell 20 shown in FIG. 2 is not provided with the first sealing structure 50. Figure 7 The injection hole 216 on the first wall 215 in the battery cell 20 shown in FIG. 3 is provided with the first sealing structure 50.

[0159] In some implementations, as shown in FIG. 4, the battery cell 20 can also be provided with a second sealing structure 60. The second sealing structure 60 is arranged on the second wall 212 of the housing 211, and the second sealing structure 60 is arranged on the second wall 212 of the housing 211 to seal the second wall 212 of the housing 211. Figure 3 to Figure 7 ​As shown, the battery cell 20 includes a housing 21, an electrode assembly 22, and a first sealing structure 50, the housing 21 includes a first wall 215 provided with a liquid injection hole 216 penetrating through the first wall 215 along a first direction, the electrode assembly 22 is accommodated in an interior of the housing 21, and the first sealing structure 50 is in sealing connection with the liquid injection hole 216, wherein the liquid injection hole 216 includes a first hole section 217 and a second hole section 218 distributed along the first direction, the first hole section 217 is located on a side of the second hole section 218 away from the electrode assembly 22, a hole diameter of the first hole section 217 is greater than a hole diameter of the second hole section 218, the first hole section 217 includes an inclined section 2171, the inclined section 2171 is provided in an inclined manner along the first direction toward an interior of the second hole section 218, the first sealing structure 50 includes a first main body part 510 and a first extension part 520 connected to each other, the first extension part 520 is located on a side of the first main body part 510 away from the electrode assembly 22, at least a part of the first main body part 510 is accommodated in and in sealing connection with the second hole section 218, at least a part of a surface of the first extension part 520 toward the inclined section 2171 abuts against at least a part of a surface of the inclined section 2171 away from the electrode assembly 22, a minimum dimension of the first extension part 520 in a direction perpendicular to the first direction is greater than or equal to a maximum dimension of the first main body part 510 in the direction perpendicular to the first direction, and the first direction is a direction along a thickness of the first wall 215 and toward the electrode assembly 22.

[0160] It should be understood that the housing 21 in the embodiments of the present application can include a shell 211 which is a hollow structure having at least one opening and an end cover 212 for being buckled with the shell 211 to form the housing 21 having a closed accommodation space. Exemplarily, as shown in Figure 3 to Figure 5 In the case where the first wall 215 is the end cover 212, the liquid injection hole 216 can be provided on the end cover 212 and the first sealing structure 50 is in sealing connection with the liquid injection hole 216. For example, the first wall 215 can be the shell 211 of the battery cell 20, that is, the liquid injection hole 216 can be provided on any one wall of the shell 211, for example, the wall with the largest area, and the first sealing structure 50 is in sealing connection with the liquid injection hole 216.

[0161] It should also be understood that in some implementations, the liquid injection hole 216 and the pressure relief mechanism 213 of the battery cell 20 can be provided on the same wall of the housing 21, or the liquid injection hole 216 and the pressure relief mechanism 213 of the battery cell 20 can be provided on different walls of the housing 21, respectively.

[0162] It should also be understood that the sealing connection between the first sealing structure 50 and the liquid injection hole 216 in the embodiments of the present application can refer to interference sealing fit or clamping connection between the first sealing structure 50 and the inner wall of the liquid injection hole 216. For example, the first main body part 510 of the first sealing structure 50 is in interference connection with the second hole section 218 of the liquid injection hole 216.

[0163] It should also be understood that the first main body part 510 and the first extension part 520 can be integrally formed or separately formed. For example, in the case of separate formation between the first main body part 510 and the first extension part 520, the first main body part 510 and the first extension part 520 can be connected by welding or bonding.

[0164] It should also be understood that the first direction in the embodiments of the present application refers to the direction along the thickness of the first wall 215 and towards the electrode assembly 22, and in some implementations, the first direction can also refer to the assembly direction of the first sealing structure 50.

[0165] It should also be understood that the cross-sectional shape of the liquid injection hole 216 in the embodiments of the present application in a plane perpendicular to the first direction can be circular, elliptical, polygonal, etc., and specifically, the cross-sectional shape of the liquid injection hole 216 in a plane perpendicular to the first direction can be set according to actual needs.

[0166] It should also be understood that the material of the first sealing structure 50 in the embodiments of the present application includes but is not limited to at least one of the following: fluororubber, ethylene-propylene-diene rubber, ethylene-propylene rubber, polytetrafluoroethylene plastic.

[0167] It should also be understood that the first hole section 217 in the embodiments of the present application has a larger hole diameter than the second hole section 218 can refer to that the maximum hole diameter of the first hole section 217 is larger than the maximum hole diameter of the second hole section 218, or the average hole diameter of the first hole section 217 is larger than the average hole diameter of the second hole section 218, or the minimum hole diameter of the first hole section 217 is larger than the minimum hole diameter of the second hole section 218.

[0168] In the embodiments of the present application, by setting the liquid injection hole 216 to include a first hole section 217 and a second hole section 218 distributed along the first direction, the first hole section 217 is located on the side of the second hole section 218 away from the electrode assembly 22, the aperture of the first hole section 217 is larger than the aperture of the second hole section 218, and the first hole section 217 includes an inclined section 2171 that is arranged to be inclined toward the inside of the second hole section 218 along the first direction, and the first sealing structure 50 is sealingly connected to the liquid injection hole 216, the first direction is the direction along the thickness of the first wall 215 and toward the electrode assembly 22, so that during the injection of electrolyte into the inside of the battery monomer 20, the electrolyte can quickly pass through the liquid injection hole and enter the inside of the battery monomer 20, reducing the residue of the electrolyte at the inner wall of the liquid injection hole 216, thereby reducing the risk of corrosion of the first sealing structure 50. Secondly, the first sealing structure 50 is arranged to include a first main body part 510 and a first extension part 520 connected to each other, the first extension part 520 is located on the side of the first main body part 510 away from the electrode assembly 22, at least part of the first main body part 510 is accommodated in the second hole section 218 and sealingly connected to the second hole section 218, at least part of the surface of the first extension part 520 toward the inclined section 2171 abuts against at least part of the surface of the inclined section 2171 away from the electrode assembly 22, and the first extension part 520 and the inclined section 2171 cooperate to limit the first sealing structure 50, thereby reducing the risk of the first sealing structure 50 falling off or falling into the inside of the battery monomer 20, thereby improving the assembly performance and use performance of the battery monomer 20.

[0169] Figure 8 A cross-sectional view of the battery monomer 20 provided by another embodiment of the present application is shown.

[0170] In some implementations, as shown in Figure 8 In the embodiments of the present application, along the first direction, the size of the first main body part 510 perpendicular to the first direction gradually decreases.

[0171] It should be understood that, in the embodiments of the present application, along the first direction, and the size of the first main body part 510 perpendicular to the first direction gradually decreases, which can mean that the size of the first main body part 510 perpendicular to the first direction continuously decreases, or discontinuously decreases. Alternatively, in some embodiments, it can also mean that the outer diameter of the first main body part 510 gradually decreases along the first direction. It should also be understood that the first main body part 510 can be arranged in a circular truncated cone structure, a prismatic truncated cone structure, or an arc-shaped structure, etc. Specifically, the structure of the first main body part 510 can be set according to actual needs.

[0172] In the embodiments of the present application, along the first direction, by setting the size of the first body part 510 in the direction perpendicular to the first direction to gradually decrease, so as to smoothly accommodate the part of the first sealing structure 50 inside the second hole section 218 of the liquid injection hole 216, the force applied to the first sealing structure 50 in the assembly process is effectively reduced, thereby improving the assembly performance and use performance of the battery monomer 20.

[0173] In some implementations, as shown in Figure 6 The inclination angle a1 of the surface of the inclined section 2171 away from the electrode assembly 22 with respect to the first direction satisfies: 0° < a1 < 90°.

[0174] Exemplarily, the inclination angle a1 of the surface of the inclined section 2171 away from the electrode assembly 22 with respect to the first direction can be set to: 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc., or a value within the range obtained by any two of the above combinations.

[0175] In the embodiments of the present application, by setting the inclination angle a1 of the surface of the inclined section 2171 away from the electrode assembly 22 with respect to the first direction to: 0° < a1 < 90°, the electrolyte residue at the inner wall of the liquid injection hole 216 is reduced when injecting electrolyte into the interior of the battery monomer 20, the risk of corrosion of the first sealing structure 50 is reduced, at the same time, the first extension part 520 and the inclined section 2171 can cooperate with each other to limit the position of the first sealing structure 50 at the liquid injection hole 216, that is, the efficiency of injecting electrolyte into the battery monomer 20 and the limiting effect of the first sealing structure 50 are considered, thereby reducing the risk of the first sealing structure 50 falling off or falling into the interior of the battery monomer 20, and improving the assembly performance and use performance of the battery monomer 20.

[0176] In some implementations, the first body part 510 and the first extension part 520 are integrally formed. Exemplarily, in the case of integrally forming between the first body part 510 and the first extension part 520, the first body part 510 and the first extension part 520 can be prepared by mold forming, thermoforming or injection molding.

[0177] In the embodiments of the present application, by setting the first body part 510 and the first extension part 520 to be integrally formed, the sealing performance and assembly performance of the first sealing structure 50 can be effectively improved, and the structural strength of the first sealing structure 50 can be improved, thereby improving the use performance of the battery monomer 20, and facilitating the reduction of the processing and manufacturing cost of the battery monomer 20.

[0178] In some implementations, a surface of the first sealing structure 50 on a side facing away from the electrode assembly 22 is lower than a surface of the first wall 215 on a side facing away from the electrode assembly 22, or the surface of the first sealing structure 50 on the side facing away from the electrode assembly 22 is flush with the surface of the first wall 215 on the side facing away from the electrode assembly 22.

[0179] In the embodiments of the present application, by setting the surface of the first sealing structure 50 on the side facing away from the electrode assembly 22 to be lower than the surface of the first wall 215 on the side facing away from the electrode assembly 22, or setting the surface of the first sealing structure 50 on the side facing away from the electrode assembly 22 to be flush with the surface of the first wall 215 on the side facing away from the electrode assembly 22, the collision or abrasion of the first sealing structure 50 by the battery cell 20 during assembly or movement is reduced, the sealing performance of the first sealing structure 50 is improved, and thus the use performance of the battery cell 20 is improved.

[0180] Figure 9 A cross-sectional view of a battery cell 20 provided by another embodiment of the present application is shown.

[0181] In some implementations, as shown in Figure 9 The battery cell 20 further includes a second sealing structure 60, at least a portion of the second sealing structure 60 is accommodated in the liquid injection hole 216 and sealingly connected with the liquid injection hole 216, the second sealing structure 60 includes a second main body portion 610 and a first protruding portion 620 connected with each other, the first protruding portion 620 is located on a side of the second main body portion 610 facing the electrode assembly 22 and extends in a direction facing the electrode assembly 22, wherein the first sealing structure 50 includes a first recess 530 with an opening facing away from the electrode assembly 22, at least a portion of the first protruding portion 620 is accommodated in the first recess 530, and at least a portion of a surface of the first protruding portion 620 facing the electrode assembly 22 abuts at least a portion of a surface of the first recess 530 facing an inside of the first recess 530.

[0182] It should be understood that the second sealing structure 60 in the embodiments of the present application is sealingly connected with the liquid injection hole 216, which can mean that a portion of the second sealing structure 60 is weldingly or adhesively connected with a portion of an inner wall of the liquid injection hole 216 to achieve a sealing assembly between the second sealing structure 60 and the liquid injection hole 216.

[0183] It should also be understood that the second sealing structure 60 in the embodiments of the present application can be integrally formed or separately formed between the second main body portion 610 and the first protruding portion 620. In the case of being separately formed between the second main body portion 610 and the first protruding portion 620, the second main body portion 610 and the first protruding portion 620 can be connected by welding or bonding, or in the case of being integrally formed between the second main body portion 610 and the first protruding portion 620, the second main body portion 610 and the first protruding portion 620 can be formed by stamping.

[0184] It should also be understood that the structure of the first protruding portion 620 in the embodiments of the present application can be correspondingly arranged according to the structure of the first recess 530. Exemplarily, along the first direction, in the case that the first recess 530 is arranged to be continuously reduced in size in the direction perpendicular to the first direction, i.e. the cross-sectional view of the first recess 530 along the first direction can be a trapezoidal recess as shown in FIG. 6B, the first protruding portion 620 can be arranged as a corresponding boss structure of the trapezoidal recess, so that at least part of the surface of the first protruding portion 620 facing the electrode assembly 22 abuts at least part of the surface of the first recess 530 facing the inside of the first recess 530. Figure 9

[0185] It should be understood that the material of the second sealing structure 60 includes but is not limited to aluminum material, steel material or titanium alloy, etc. Exemplarily, the material of the second sealing structure 60 can be the same as the material of the shell 211 of the battery monomer 20.

[0186] In the embodiments of the present application, by arranging the second sealing structure 60 in the battery monomer 20, the first protruding portion 620 of the second sealing structure 60 is located on the side of the second main body portion 610 facing the electrode assembly 22 and extends in the direction facing the electrode assembly 22, and the first sealing structure 50 includes the first recess 530 with the opening facing away from the electrode assembly 22, at least part of the first protruding portion 620 is accommodated in the first recess 530, and at least part of the surface of the first protruding portion 620 facing the electrode assembly 22 abuts at least part of the surface of the first recess 530 facing the inside of the first recess 530, so as to effectively improve the limiting effect on the first sealing structure 50, and at the same time, the second sealing structure 60 plays a positioning role, so as to facilitate the assembly of the second sealing structure 60, thereby improving the use performance of the battery monomer 20.

[0187] In some implementations, as shown in FIG. 6B, along the first direction, the size of the first recess 530 in the direction perpendicular to the first direction gradually decreases. Figure 9

[0188] ​​It should be understood that, in the embodiments of the present application, the first groove 530 gradually decreases in size in the direction perpendicular to the first direction can mean that the first groove 530 continuously decreases in size in the direction perpendicular to the first direction, or non-continuously decreases in size. Alternatively, in some embodiments, it can also mean that the inner diameter of the first groove 530 gradually decreases in the first direction. For example, the first groove 530 can be provided in an arc-shaped structure, and specifically, the structure of the first groove 530 can be provided according to actual needs.

[0189] In the embodiments of the present application, along the first direction, by setting the first groove 530 to gradually decrease in size in the direction perpendicular to the first direction, and by at least part of the first protrusion 620 being accommodated in the first groove 530, at least part of the surface of the first protrusion 620 facing the electrode assembly 22 abuts at least part of the surface of the first groove 530 facing the inside of the first groove 530, so as to improve the positioning effect on the second sealing structure 60, facilitate the assembly of the second sealing structure 60, and thus improve the use performance of the battery monomer 20.

[0190] In some implementations, at least part of the surface of the first protrusion 620 facing the electrode assembly 22 abuts the entire surface of the first groove 530 facing the inside of the first groove 530.

[0191] In the embodiments of the present application, by setting at least part of the surface of the first protrusion 620 facing the electrode assembly 22 to abut the entire surface of the first groove 530 facing the inside of the first groove 530, the first protrusion 620 of the second sealing structure 60 is in close contact with the entire surface of the inside of the first groove 530 of the first sealing structure 50, so as to further improve the positioning effect on the second sealing structure 60, facilitate the assembly of the second sealing structure 60, and thus improve the use performance of the battery monomer 20.

[0192] Figure 10 A cross-sectional schematic view of a battery monomer 20 provided by another embodiment of the present application is shown. Figure 11 A cross-sectional schematic view of a battery monomer 20 provided by another embodiment of the present application is shown. For example, Figure 10 The liquid injection hole 216 on the first wall 215 in the battery monomer 20 shown in FIG. 1 is not provided with the first sealing structure 50 and the second sealing structure 60. Figure 11 The liquid injection hole 216 on the first wall 215 in the battery monomer 20 shown in FIG. 2 is provided with the first sealing structure 50 and the second sealing structure 60.

[0193] In some implementations, as Figure 10As shown, the liquid injection hole 216 further includes a third hole section 219 located on a side of the first hole section 217 away from the electrode assembly 22, and a portion of the second sealing structure 60 is accommodated in the third hole section 219, and the third hole section 219 has a larger hole diameter than the second hole section 218.

[0194] It should be understood that the larger hole diameter of the third hole section 219 than the second hole section 218 in the embodiments of the present application can mean that the maximum hole diameter of the third hole section 219 is larger than the maximum hole diameter of the second hole section 218, or the average hole diameter of the third hole section 219 is larger than the average hole diameter of the second hole section 218, or the minimum hole diameter of the third hole section 219 is larger than the minimum hole diameter of the second hole section 218.

[0195] In the embodiments of the present application, by arranging the liquid injection hole 216 to include the third hole section 219 located on a side of the first hole section 217 away from the electrode assembly 22, and a portion of the second sealing structure 60 is accommodated in the third hole section 219, and the third hole section 219 has a larger hole diameter than the second hole section 218, the assembly of the second sealing structure 60 is facilitated, the influence on the first sealing structure 50 is reduced in the process of welding between the second sealing structure 60 and the surface of the liquid injection hole 216 facing the inside of the liquid injection hole 216, and thus the use performance of the battery monomer 20 is improved.

[0196] Figure 12 A cross-sectional schematic view of a battery monomer 20 provided by another embodiment of the present application is shown. Figure 13 A cross-sectional schematic view of a battery monomer 20 provided by another embodiment of the present application is shown. Exemplarily, Figure 12 The liquid injection hole 216 on the first wall 215 in the battery monomer 20 shown in FIG. 1 is not provided with the first sealing structure 50 and the second sealing structure 60. Figure 13 The liquid injection hole 216 on the first wall 215 in the battery monomer 20 shown in FIG. 2 is provided with the first sealing structure 50 and the second sealing structure 60.

[0197] In some implementations, as Figure 12 and Figure 13 As shown, the first hole section 217 further includes a flat section 2172 having a surface facing away from the electrode assembly 22 perpendicular to the first direction, and the flat section 2172 is located between the third hole section 219 and the inclined section 2171, and the first sealing structure 50 further includes a second extension 540 connected to a side of the first extension 520 away from the first main body 510 and extending in a direction away from the geometric center of the first sealing structure 50, and at least a portion of the surface of the second extension 540 facing the electrode assembly 22 abuts at least a portion of the surface of the flat section 2172 facing away from the electrode assembly 22.

[0198] It should be understood that the second extension 540 in the embodiments of the present application can be integrally formed with the first extension 520 or separately formed. Exemplarily, in the case of separate formation between the second extension 540 and the first extension 520, the second extension 540 and the first extension 520 can be connected by welding or bonding. In the case of integral formation between the second extension 540 and the first extension 520, the second extension 540 and the first extension 520 can be prepared by die forming, thermoforming or injection molding.

[0199] In the embodiments of the present application, by further providing a flat section 2172 in the first hole section 217, a surface of the flat section 2172 facing away from the electrode assembly 22 is perpendicular to the first direction, the flat section 2172 is located between the third hole section 219 and the inclined section 2171, and the first sealing structure 50 further has a second extension 541 connected to a side of the first extension 520 away from the first main body 510 and extending away from the geometric center of the first sealing structure 50, at least part of a surface of the second extension 540 abuts at least part of a surface of the flat section 2172 facing away from the electrode assembly 22, to further improve the limiting effect on the first sealing structure 50, effectively reduce the risk of the first sealing structure 50 falling off or falling into the inside of the battery monomer 20, and thus improve the assembly performance and use performance of the battery monomer 20.

[0200] In some implementations, the second sealing structure 60 is fixedly connected with the first sealing structure 50, and a projection of the second sealing structure 60 covers a projection of the first sealing structure 50 in a plane perpendicular to the first direction.

[0201] It should be understood that the fixed connection of the second sealing structure 60 with the first sealing structure 50 can mean that the second sealing structure 60 and the first sealing structure 50 are connected by clamping, interference or threaded connection, etc.

[0202] In the embodiments of the present application, by fixedly connecting the second sealing structure 60 with the first sealing structure 50, and the projection of the second sealing structure 60 covering the projection of the first sealing structure 50 in a plane perpendicular to the first direction, the limiting effect on the first sealing structure 50 is further improved, the risk of the first sealing structure 50 falling off or falling into the inside of the battery monomer 20 is further reduced, and thus the assembly performance and use performance of the battery monomer 20 are improved, and meanwhile, the fixed connection of the second sealing structure 60 with the first sealing structure 50 can improve the assembly efficiency of the first sealing structure 50 and the second sealing structure 60 relative to the liquid injection hole 216.

[0203] Figure 14A cross-sectional view of a battery cell 20 is shown.

[0204] In some implementations, as shown, the first extension portion 520 includes a first through hole 541 extending through the first extension portion 520 in the first direction, the first body portion 510 includes a second recess 511 having an opening facing away from the electrode assembly 22, the first through hole 541 and the second recess 511 communicate to form the first recess 530, the first protrusion portion 620 includes a first sub-protrusion portion 621 and a second sub-protrusion portion 622 connected to each other, the second sub-protrusion portion 622 is located on a side of the first sub-protrusion portion 621 facing the electrode assembly 22, at least a portion of the first sub-protrusion portion 621 is accommodated in the first through hole 541, and at least a portion of the second sub-protrusion portion 622 is accommodated in the second recess 511. Figure 14

[0205] It should be understood that the shapes of the first through hole 541 and the second recess 511 described above can be set according to actual needs. For example, the cross-sectional shape of the first through hole 541 or the second recess 511 in a plane perpendicular to the first direction can be circular, elliptical, polygonal, or the like.

[0206] It should also be understood that the first through hole 541 and the second recess 511 can communicate to form the first recess 530, for example, the end of the first through hole 541 in the first direction is connected to the opening of the second recess 511 to form the first recess 530.

[0207] It should also be understood that the first sub-protrusion portion 621 and the second sub-protrusion portion 622 in the embodiments of the present application can be integrally formed or separately formed. In the case of separate formation between the first sub-protrusion portion 621 and the second sub-protrusion portion 622, the first sub-protrusion portion 621 and the second sub-protrusion portion 622 can be connected by welding or bonding, or, in the case of integral formation between the first sub-protrusion portion 621 and the second sub-protrusion portion 622, the first sub-protrusion portion 621 and the second sub-protrusion portion 622 can be formed by stamping.

[0208] ​In the embodiment of the present application, by setting the first extension part 520 to include a first through hole 541 penetrating through the first extension part 520 in the first direction, the first main part 510 includes a second groove 511 with an opening facing away from the electrode assembly 22, the first through hole 541 and the second groove 511 communicate to form the first groove 530, and the first protrusion part 620 is set to include a first sub-protrusion part 621 and a second sub-protrusion part 622 connected to each other, the second sub-protrusion part 622 is located on the side of the first sub-protrusion part 621 facing the electrode assembly 22, at least part of the first sub-protrusion part 621 is accommodated in the first through hole 541, and at least part of the second sub-protrusion part 622 is accommodated in the second groove 511, so as to improve the limiting effect of the first sealing structure 50, realize the fixed connection between the second sealing structure 60 and the first sealing structure 50, and improve the assembly efficiency of the first sealing structure 50 and the second sealing structure 60 relative to the liquid injection hole 216.

[0209] In some implementations, at least part of the second sub-protrusion part 622 and the inner wall of the second groove 511 are connected by one of the following connection modes: threaded connection, clamping connection or interference fit.

[0210] It should be understood that at least part of the second sub-protrusion part 622 and the inner wall of the second groove 511 are connected by one of the following connection modes: threaded connection, clamping connection or interference fit, which can mean that the second sub-protrusion part 622 of the second sealing structure 60 and the inner wall of the second groove 511 of the first sealing structure 50 are first connected by threaded connection, clamping connection or interference fit, and then assembled to the liquid injection hole 216.

[0211] In the embodiment of the present application, by setting at least part of the second sub-protrusion part 622 and the inner wall of the second groove 511 to be connected by one of the following connection modes: threaded connection, clamping connection or interference fit, the connection strength between the second sealing structure 60 and the first sealing structure 50 is improved, the assembly efficiency of the second sealing structure 60 and the first sealing structure 50 relative to the liquid injection hole 216 is effectively improved, thereby effectively improving the limiting effect of the first sealing structure 50, reducing the risk of the first sealing structure 50 falling off or falling into the inside of the battery monomer 20, and improving the assembly performance and use performance of the battery monomer 20.

[0212] In some implementations, in the first direction, the size of the second sub-protrusion part 622 is less than or equal to the depth of the second groove 511.

[0213] It should be understood that, along the first direction, the size of the second sub-protrusion 622 is less than or equal to the depth of the second groove 511, which can mean that the part of the surface of the first protrusion 620 on the side facing the electrode assembly 22, except for the second sub-protrusion, can be attached or directly contacted with the part of the surface of the first body 510 on the side away from the electrode assembly 22, except for the second groove 511, effectively improving the sealing performance between the first sealing structure 50 and the second sealing structure, reducing the risk of electrolyte flowing into the second groove 511, and improving the connection strength between the first sealing structure 50 and the second sealing structure 60, while reducing the thickness of the first sealing structure 50 and the second sealing structure 60 after being fixedly connected in the first direction.

[0214] In the embodiments of the present application, along the first direction, the size of the second sub-protrusion 622 is less than or equal to the depth of the second groove 511, so that the second sub-protrusion 622 can be accommodated in the second groove 511, and the part of the surface of the first protrusion 620 on the side facing the electrode assembly 22 can be attached or directly contacted with the part of the surface of the first body 510 on the side away from the electrode assembly 22, improving the connection strength between the first sealing structure 50 and the second sealing structure 60, facilitating the assembly efficiency of the second sealing structure 60 and the first sealing structure 50 relative to the liquid injection hole 216, and thus improving the assembly performance and use performance of the battery monomer 20.

[0215] In some implementations, the surface of the second sealing structure 60 on the side away from the electrode assembly 22 is lower than the surface of the first wall 215 on the side away from the electrode assembly 22, or the surface of the second sealing structure 60 on the side away from the electrode assembly 22 is flush with the surface of the first wall 215 on the side away from the electrode assembly 22.

[0216] In the embodiments of the present application, by setting the surface of the second sealing structure 60 on the side away from the electrode assembly 22 to be lower than the surface of the first wall 215 on the side away from the electrode assembly 22, or setting the surface of the second sealing structure 60 on the side away from the electrode assembly 22 to be flush with the surface of the first wall 215 on the side away from the electrode assembly 22, the collision or wear of the second sealing structure 60 during the assembly or movement of the battery monomer 20 is reduced, the sealing performance of the second sealing structure 60 is improved, and thus the use performance of the battery monomer 20 is improved.

[0217] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 10 comprising a plurality of battery monomers 20, wherein the battery monomer 20 is the battery monomer 20 in any of the above embodiments.

[0218] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 10 as described above. Figure 1 The use device can be the vehicle 1 as shown in the above, or any use device using the battery device 10.

[0219] The use device can be any device or system using the battery device 10 as described above.

[0220] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 10 as described above.

[0221] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 10 as described above. Figure 3 to Figure 11The battery cell 20 includes a housing 21, an electrode assembly 22, and a first sealing structure 50. The housing 21 includes a first wall 215 provided with a liquid injection hole 216 extending through the first wall 215 in a first direction. The electrode assembly 22 is accommodated in an inside of the housing 21. The first sealing structure 50 is sealingly connected with the liquid injection hole 216. The liquid injection hole 216 includes a first hole section 217 and a second hole section 218 distributed in the first direction. The first hole section 217 is located on a side of the second hole section 218 away from the electrode assembly 22. A hole diameter of the first hole section 217 is greater than a hole diameter of the second hole section 218. The first hole section 217 includes an inclined section 2171 inclinedly arranged toward an inside of the second hole section 218 in the first direction. The first sealing structure 50 includes a first body portion 510 and a first extension portion 520 connected with each other. The first extension portion 520 is located on a side of the first body portion 510 away from the electrode assembly 22. At least a portion of the first body portion 510 is accommodated in and sealingly connected with the second hole section 218. At least a portion of a surface of the first extension portion 520 toward the inclined section 2171 abuts against at least a portion of a surface of the inclined section 2171 away from the electrode assembly 22. A minimum dimension of the first extension portion 520 in a direction perpendicular to the first direction is greater than or equal to a maximum dimension of the first body portion 510 in the direction perpendicular to the first direction. The first direction is a direction along a thickness of the first wall 215 and toward the electrode assembly 22. The battery cell 20 further includes a second sealing structure 60. At least a portion of the second sealing structure 60 is accommodated in and sealingly connected with the liquid injection hole 216. The second sealing structure 60 includes a second body portion 610 and a first protrusion portion 620 connected with each other. The first protrusion portion 620 is located on a side of the second body portion 610 toward the electrode assembly 22 and extends toward the electrode assembly 22. The first sealing structure 50 includes a first recess 530 having an opening away from the electrode assembly 22. At least a portion of the first protrusion portion 620 is accommodated in the first recess 530. At least a portion of a surface of the first protrusion portion 620 toward the electrode assembly 22 abuts against an entire surface of the first recess 530 toward an inside of the first recess 530. The liquid injection hole 216 further includes a third hole section 219 located on a side of the first hole section 217 away from the electrode assembly 22. A portion of the second sealing structure 60 is accommodated in the third hole section 219. A hole diameter of the third hole section 219 is greater than the hole diameter of the second hole section 218.

[0222] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery, comprising: a housing (21) comprising a first wall (215) provided with a liquid injection hole (216) penetrating through the first wall (215) along a first direction; an electrode assembly (22) accommodated in the interior of the housing (21); a first sealing structure (50) in sealing connection with the liquid injection hole (216); wherein the liquid injection hole (216) comprises a first hole section (217) and a second hole section (218) distributed along the first direction, the first hole section (217) is located on the side of the second hole section (218) away from the electrode assembly (22), the aperture of the first hole section (217) is larger than that of the second hole section (218), and the first hole section (217) comprises an inclined section (2171) which is arranged to be inclined towards the interior of the second hole section (218) along the first direction; the first sealing structure (50) comprises a first main body part (510) and a first extension part (520) connected with each other, the first extension part (520) is located on the side of the first main body part (510) away from the electrode assembly (22), at least part of the first main body part (510) is accommodated in the second hole section (218) and is in sealing connection with the second hole section (218), at least part of the surface of the first extension part (520) towards the inclined section (2171) abuts against at least part of the surface of the inclined section (2171) away from the electrode assembly (22), the minimum dimension of the first extension part (520) in the direction perpendicular to the first direction is greater than or equal to the maximum dimension of the first main body part (510) in the direction perpendicular to the first direction, and the first direction is the direction along the thickness of the first wall (215) and towards the electrode assembly (22).

2. The battery cell of claim 1, wherein, Along the first direction, the dimension of the first main body part (510) in the direction perpendicular to the first direction gradually decreases.

3. The battery cell of claim 1, wherein, The inclination angle alpha1 of the surface of the inclined section (2171) away from the electrode assembly (22) with respect to the first direction satisfies 0° < alpha1 < 90°.

4. The battery cell of claim 1, wherein, The first main body part (510) and the first extension part (520) are integrally formed.

5. The battery cell of claim 1, wherein, The surface of the first sealing structure (50) on the side away from the electrode assembly (22) is lower than the surface of the first wall (215) on the side away from the electrode assembly (22), or the surface of the first sealing structure (50) on the side away from the electrode assembly (22) is flush with the surface of the first wall (215) on the side away from the electrode assembly (22).

6. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell (20) further comprises a second sealing structure (60), at least part of the second sealing structure (60) is accommodated in the liquid injection hole (216) and is in sealing connection with the liquid injection hole (216), the second sealing structure (60) comprises a second main body part (610) and a first protruding part (620) connected with each other, the first protruding part (620) is located on a side of the second main body part (610) facing the electrode assembly (22) and extends in a direction facing the electrode assembly (22), The first sealing structure (50) comprises a first groove (530) with an opening facing away from the electrode assembly (22), at least part of the first protruding part (620) is accommodated in the first groove (530), and at least part of a surface of the first protruding part (620) facing the electrode assembly (22) abuts at least part of a surface of the first groove (530) facing the inside of the first groove (530).

7. The battery cell of claim 6, wherein, In the first direction, the size of the first groove (530) perpendicular to the first direction gradually decreases.

8. The battery cell of claim 6, wherein, At least part of a surface of the first protruding part (620) facing the electrode assembly (22) abuts all surfaces of the first groove (530) facing the inside of the first groove (530).

9. The battery cell of claim 6, wherein, The liquid injection hole (216) further comprises a third hole section (219), the third hole section (219) is located on a side of the first hole section (217) away from the electrode assembly (22), part of the second sealing structure (60) is accommodated in the third hole section (219), and the hole diameter of the third hole section (219) is greater than the hole diameter of the second hole section (218).

10. The battery cell of claim 9, wherein, The first hole section (217) further comprises a flat section (2172), a surface of the flat section (2172) facing away from the electrode assembly (22) is perpendicular to the first direction, the flat section (2172) is located between the third hole section (219) and the inclined section (2171), the first sealing structure (50) further comprises a second extending part (540), the second extending part (540) is connected to a side of the first extending part (520) away from the first main body part (510) and extends in a direction away from the geometric center of the first sealing structure (50), at least part of a surface of the second extending part (540) facing the electrode assembly (22) abuts at least part of a surface of the flat section (2172) facing away from the electrode assembly (22).

11. The battery cell of claim 6, wherein, The second sealing structure (60) is fixedly connected with the first sealing structure (50), and in a plane perpendicular to the first direction, the projection of the second sealing structure (60) covers the projection of the first sealing structure (50).

12. The battery cell of claim 11, wherein, The first extension portion (520) comprises a first through hole (541) penetrating through the first extension portion (520) along the first direction, the first main body portion (510) comprises a second groove (511) with an opening facing away from the electrode assembly (22), the first through hole (541) and the second groove (511) communicate to form the first groove (530), the first protrusion portion (620) comprises a first sub-protrusion portion (621) and a second sub-protrusion portion (622) connected to each other, the second sub-protrusion portion (622) is located on a side of the first sub-protrusion portion (621) facing the electrode assembly (22), at least part of the first sub-protrusion portion (621) is accommodated in the first through hole (541), and at least part of the second sub-protrusion portion (622) is accommodated in the second groove (511).

13. The battery cell of claim 12, wherein, At least part of the second sub-protrusion portion (622) and an inner wall of the second groove (511) are connected by one of the following connection modes: threaded connection, clamping connection or interference connection.

14. The battery cell of claim 12, wherein, In the first direction, the size of the second sub-protrusion portion (622) is less than or equal to the depth of the second groove (511).

15. The battery cell of any one of claims 7 to 14, wherein, The surface of the second sealing structure (60) on the side facing away from the electrode assembly (22) is lower than the surface of the first wall (215) on the side facing away from the electrode assembly (22), or the surface of the second sealing structure (60) on the side facing away from the electrode assembly (22) is flush with the surface of the first wall (215) on the side facing away from the electrode assembly (22).

16. A battery device characterized by comprising: Comprising: A plurality of battery cells as claimed in any one of claims 1 to 15.

17. An electrical device, comprising: Comprising: A battery device as claimed in claim 16, the battery device being configured to provide electrical energy to the electrical device.

18. An energy storage device, characterized by Comprising: A battery device as claimed in claim 16, the battery device being configured to store electrical energy for the energy storage device.

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