Battery cell, battery apparatus, electric apparatus, and energy storage apparatus

Abstract

Embodiments of the present application provide a battery cell, a battery apparatus, an electric apparatus, and an energy storage apparatus, which can improve the use performance of a battery cell. The battery cell comprises: a casing, an electrode assembly, a first electrode terminal, and a liquid injection hole. The casing comprises a first wall; the electrode assembly is accommodated inside the casing; the first electrode assembly is arranged in a first region of the first wall; the liquid injection hole is formed in a second region of the first wall and runs through the first wall in the thickness direction of the first wall; on a plane perpendicular to the thickness direction of the first wall, the projection of the first region does not overlap the projection of the second region; and in the thickness direction of the first wall, the surface of the first region away from the electrode assembly is arranged farther away from the electrode assembly than the surface of the second region away from the electrode assembly.

Description

Battery cells, battery devices, electrical devices, and energy storage devices Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, an electrical device, and an energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, besides improving the electrical performance of battery devices, safety is also a crucial issue. For example, during the electrolyte injection into battery cells, electrolyte can easily splash onto the electrode terminals, posing a risk of corrosion to the cell's casing and reducing its safety. If the safety of a battery cell cannot be guaranteed, it becomes unusable, thus reducing its performance. Therefore, improving the performance of battery cells has become a pressing technical problem in this field. Summary of the Invention

[0004] This application provides a battery cell, a battery device, an electrical device, and an energy storage device, which can improve the performance of the battery cell.

[0005] In a first aspect, a battery cell is provided, comprising: a housing including a first wall; an electrode assembly housed inside the housing; a first electrode terminal disposed in a first region of the first wall; and an injection hole disposed in a second region of the first wall and penetrating the first wall along its thickness direction, wherein the projection of the first region and the projection of the second region do not overlap on a plane perpendicular to the thickness direction of the first wall; wherein, along the thickness direction of the first wall, the surface of the first region away from the electrode assembly is disposed further away from the electrode assembly than the surface of the second region away from the electrode assembly.

[0006] In this embodiment, by setting the first electrode terminal in a first region of a first wall and providing a liquid injection hole penetrating the first wall along its thickness direction in a second region of the first wall, the projections of the first region and the second region do not overlap on a plane perpendicular to the thickness direction of the first wall. Furthermore, along the thickness direction of the first wall, the surface of the first region away from the electrode assembly is positioned further away from the electrode assembly than the surface of the second region away from the electrode assembly. This effectively reduces the risk of electrolyte splashing onto the area where the first electrode terminal is located during the electrolyte injection process of the battery cell, thereby reducing the risk of corrosion to the battery cell's casing and improving the battery cell's performance.

[0007] In some embodiments, the first wall is further provided with a second electrode terminal, and on a plane perpendicular to the thickness direction of the first wall, the minimum distance between the injection hole and the first electrode terminal is greater than or equal to the minimum distance between the injection hole and the second electrode terminal, and the polarities of the first electrode terminal and the second electrode terminal are opposite.

[0008] In this embodiment, on a plane perpendicular to the thickness direction of the first wall, by setting the minimum distance between the injection hole and the first electrode terminal to be greater than or equal to the minimum distance between the injection hole and the second electrode terminal, and the polarities of the first electrode terminal and the second electrode terminal being opposite, the risk of electrolyte splashing to the area where the first electrode terminal is located can be effectively reduced, the risk of corrosion of the battery cell casing can be effectively reduced, thereby improving the performance of the battery cell.

[0009] In some embodiments, the housing includes a casing, and if the casing is made of steel, the first electrode terminal is a positive electrode terminal; or if the casing is made of aluminum, the first electrode terminal is a negative electrode terminal.

[0010] In this embodiment, on a plane perpendicular to the thickness direction of the first wall, by setting the minimum distance between the injection hole and the first electrode terminal to be greater than or equal to the minimum distance between the injection hole and the second electrode terminal, the polarities of the first electrode terminal and the second electrode terminal are opposite. Furthermore, when the housing material includes steel, the first electrode terminal is a positive electrode terminal; or, when the housing material includes aluminum, the first electrode terminal is a negative electrode terminal. This further reduces the risk of electrolyte splashing onto the area where the first electrode terminal is located, effectively reducing the risk of corrosion to the battery cell's casing and thus improving the battery cell's performance.

[0011] In some embodiments, the surface of the first wall away from the electrode assembly is provided with a protruding structure that protrudes in a direction away from the electrode assembly and is located between the injection hole and the first electrode terminal.

[0012] In this embodiment, a protruding structure is provided on the surface of the first wall away from the electrode assembly. The protruding structure protrudes in a direction away from the electrode assembly and is located between the injection hole and the first electrode terminal. During the electrolyte injection process of the battery cell, the protruding structure can block the splashing of electrolyte, thereby effectively reducing the risk of electrolyte splashing to the area where the first electrode terminal is located, reducing the risk of corrosion of the battery cell casing, and thus improving the performance of the battery cell.

[0013] In some embodiments, along the protrusion direction of the protrusion structure, the dimension of the protrusion structure gradually increases in the direction perpendicular to the thickness of the first wall.

[0014] In this embodiment, along the protrusion direction of the protrusion structure, by setting the size of the protrusion structure in the direction perpendicular to the thickness of the first wall to gradually increase, that is, during the process of injecting electrolyte into the battery cell, the protrusion structure can block the splashing of electrolyte on a portion of its surface facing the electrode assembly, thereby further reducing the risk of electrolyte splashing into the area where the first electrode terminal is located, thereby reducing the risk of corrosion of the battery cell casing and improving the performance of the battery cell.

[0015] In some embodiments, the protruding structure is integrally stamped with the first wall.

[0016] In this embodiment, the protruding structure is integrally stamped with the first wall to facilitate the processing and manufacturing of the battery cell's casing and improve the manufacturing performance of the battery cell.

[0017] In some embodiments, the protrusion structure includes a first protrusion structure disposed on the surface of the first region away from the electrode assembly, the first protrusion structure being disposed near the injection hole.

[0018] In this embodiment, by configuring the protrusion structure to include a first protrusion structure, the first protrusion structure being disposed on the surface of the first region away from the electrode assembly and being disposed close to the injection hole, that is, during the process of injecting electrolyte into the battery cell, the portion of the surface of the first protrusion structure facing the injection hole can block the splashing of electrolyte, thereby further reducing the risk of electrolyte splashing into the area where the first electrode terminal is located, thereby reducing the risk of corrosion of the battery cell casing and improving the performance of the battery cell.

[0019] In some embodiments, the protrusion structure includes a second protrusion structure disposed in the second region away from the electrode assembly, the second protrusion structure being disposed at least partially around the outer periphery of the injection hole.

[0020] In this embodiment, by configuring the protrusion structure to include a second protrusion structure, the second protrusion structure is disposed on the surface of the second region away from the electrode assembly, and at least a portion of the second protrusion structure is configured to surround the outer periphery of the injection hole. That is, during the electrolyte injection process of the battery cell, the second protrusion structure can block the splashing of electrolyte, thereby further reducing the risk of electrolyte splashing to the area where the first electrode terminal is located, thereby reducing the risk of corrosion of the battery cell casing and improving the performance of the battery cell.

[0021] In some embodiments, the second protrusion structure is an annular structure, with the inner ring of the annular structure surrounding the injection hole.

[0022] In this embodiment, the second protrusion structure is set as a ring structure, and the inner ring of the ring structure surrounds the liquid injection hole, so as to facilitate the processing and manufacturing of the second protrusion structure, improve the processing and manufacturing efficiency of the battery cell, and take into account both the performance of the battery cell and the manufacturing performance.

[0023] In some embodiments, a connection is formed between the first region and the second region, and the surface of the connection away from the electrode assembly is provided with a protruding structure, and / or the surface of the connection away from the electrode assembly is provided with a groove structure.

[0024] In this embodiment, by forming a connection between the first region and the second region, and providing a protruding structure on the surface of the connection away from the electrode assembly to block electrolyte splashing, and / or by providing a groove structure on the surface of the connection away from the electrode assembly to store or contain electrolyte, the connection effectively reduces the risk of electrolyte splashing to the area where the first electrode terminal is located, thereby reducing the risk of corrosion of the battery cell casing and improving the performance of the battery cell.

[0025] In a second aspect, a battery device is provided, comprising: a plurality of battery cells, wherein the battery cells are those described in the first aspect or its various implementations.

[0026] Thirdly, an electrical device is provided, including the battery device described in the second aspect, the battery device being used to provide electrical energy to the electrical device.

[0027] In some implementations, the electrical device can be a vehicle, ship, or spacecraft.

[0028] Fourthly, an energy storage device is provided, including the battery device described in the second aspect, the battery device being used to store electrical energy for the energy storage device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0030] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application.

[0031] Figure 2 is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0032] Figure 3 is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0033] Figure 4 is an exploded structural diagram of a battery cell provided in an embodiment of this application.

[0034] Figure 5 is a cross-sectional schematic diagram of a battery cell provided in an embodiment of this application.

[0035] Figure 6 is a cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0036] Figure 7 is a schematic diagram of the structure of a battery cell provided in another embodiment of this application.

[0037] Figure 8 is a cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0038] Figure 9 is a cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery assembly; 20-Battery cell; 30-Controller; 40-Motor; 111-First part; 112-Second part; 112a-Base plate; 112b-Side plate; 21-Outer shell; 22-Electrode assembly; 211-Shell; 212-End cap; 222-Electrode tab; 222a-Positive electrode tab; 222b-Negative electrode tab; 213-Electrode terminal; 214a-First electrode terminal; 214b-Second electrode terminal; 23-Connecting member; 50-First wall; 510-First region; 511-First surface; 520-Second region; 521-Second surface; 530-Connecting part; 60-Injection hole; 610-Seal; 70-Protruding structure; 710-First protruding structure; 720-Second protruding structure.

[0040] The accompanying drawings are not drawn to scale. Detailed Implementation

[0041] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0048] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0049] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0050] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0051] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0052] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0053] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0054] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0055] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0056] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0057] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0058] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0059] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0060] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0061] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0062] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0063] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0064] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0065] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0066] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0067] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0068] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0069] Liquid electrolytes include electrolyte salts and solvents.

[0070] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0071] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0072] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0073] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0074] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0075] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0076] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0077] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0078] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0079] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0080] In some implementations, the electrode assembly is a stacked structure.

[0081] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0082] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0083] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0084] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0085] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0086] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0087] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0088] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0089] 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. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0090] 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 it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0091] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0092] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0093] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0094] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0095] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0096] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0097] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0098] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0099] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0100] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0101] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0102] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0103] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0104] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0105] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0106] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0107] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0108] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery clusters may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0109] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0110] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0111] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0112] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0113] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0114] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0115] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and Ethernet and fiber optic conversion modules.

[0116] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0117] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0118] Currently, energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. In the development of battery technology, besides improving the electrical performance of battery devices, safety is also a significant concern. For example, during the electrolyte injection into battery cells, electrolyte can easily splash onto the electrode terminals, posing a risk of corrosion to the cell's casing, reducing its structural strength and thus lowering the cell's safety. If the safety of a battery cell cannot be guaranteed, it becomes unusable, reducing its performance. Therefore, improving the performance of battery cells has become a pressing technical problem in this field.

[0119] Therefore, embodiments of this application provide a battery cell, a battery device, an electrical device, and an energy storage device. The battery cell includes: a housing, an electrode assembly, a first electrode terminal, and a liquid injection hole. The housing includes a first wall, the electrode assembly is housed inside the housing, the first electrode terminal is disposed in a first region of the first wall, and the liquid injection hole is disposed in a second region of the first wall and penetrates the first wall along its thickness direction. On a plane perpendicular to the thickness direction of the first wall, the projection of the first region and the projection of the second region do not overlap. In particular, along the thickness direction of the first wall, the surface of the first region away from the electrode assembly is disposed further away from the electrode assembly than the surface of the second region away from the electrode assembly. Thus, in this embodiment, by setting the first electrode terminal in a first region of the first wall and providing a liquid injection hole penetrating the first wall along its thickness direction in a second region of the first wall, the projections of the first region and the second region do not overlap on a plane perpendicular to the thickness direction of the first wall. Furthermore, along the thickness direction of the first wall, the surface of the first region away from the electrode assembly is positioned further away from the electrode assembly than the surface of the second region away from the electrode assembly. This effectively reduces the risk of electrolyte splashing onto the area where the first electrode terminal is located during the electrolyte injection process of the battery cell, thereby reducing the risk of corrosion to the battery cell's casing and improving the battery cell's performance.

[0120] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0121] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0122] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0123] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle 1 according to an embodiment of this application, vehicle 1 can be a gasoline vehicle, a natural gas 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 is used to control 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, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's 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.

[0124] 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.

[0125] For example, as shown in Figure 2, which is a structural schematic diagram of a battery device 10 according to an embodiment of this application, the battery device 10 may include a plurality of battery cells 20. The battery device 10 may also include a housing 11 (or cover), the housing 11 having a hollow structure, and the plurality of battery cells 20 are housed within the housing 11. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed configuration and then placed within the housing 11.

[0126] As shown in Figure 2, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The housing may include a bottom plate 112a, side plates 112b, and beams. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0127] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0128] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements.

[0129] In this embodiment, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery device 10 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0130] Figure 3 shows a schematic diagram of the structure of a battery cell 20 according to one embodiment of this application, and Figure 4 shows an exploded structural diagram of a battery cell 20 according to another embodiment of this application. As shown in Figures 3 and 4, the battery cell 20 of this embodiment may include: a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving space, and the electrode assembly 22 is placed in the receiving space within the housing 21. The housing 21 may include a shell 211 and an end cap 212. The shell 211 is a hollow structure with at least one opening; the end cap 212 is used to fasten with the shell 211 to form a housing 21 with a closed receiving space.

[0131] It should be understood that the battery cell 20 in this application embodiment can be a secondary battery. A secondary battery refers to a battery cell 20 that can be recharged after being discharged to activate the active materials and continue to be used. For example, the battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0132] The electrode assembly 22 in this embodiment includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 20, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0133] In some embodiments, the end cap 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the end cap 212 has a similar structure to the housing 211, that is, both the housing 211 and the end cap 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed accommodating space.

[0134] It should be understood that if the end cap 212 is a plate-like structure, the shell 211 can be a hollow structure with an opening at one or more ends. For example, if the shell 211 is a hollow structure with an opening at one end, the end cap 212 can be set as one; if the shell 211 is a hollow structure with openings at opposite ends, the end cap 212 can be set as two, with the two end caps 212 respectively covering the openings at both ends of the shell 211.

[0135] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, as shown in Figures 3 and 4, in this embodiment of the application, the outer shell 21 is mainly described as a cuboid structure.

[0136] It should be understood that the end cap 212 in this embodiment of the application is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211, as shown in Figures 3 and 4. The housing 211 is a cuboid structure, and the end cap 212 is a rectangular plate structure adapted to the housing 211.

[0137] The material of the housing 211 in this embodiment may include one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may also be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may be the same as or different from that of the housing 211; the materials of the different walls of the housing 211 may also be the same or different.

[0138] The end cap 212 in this embodiment can be any wall of the outer shell 21. For example, the end cap 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the end cap 212 can also be other structures. For example, the end cap 212 can also be a groove structure with an opening to cover the opening of the shell 211. This embodiment is not limited to this.

[0139] It should be understood that the battery cell 20 also includes electrode terminals 213. In this embodiment, the electrode terminals 213 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output electrical energy from the battery cell 20. As shown in Figures 3 and 4, the battery cell 20 may include at least two electrode terminals 213, which may include at least one first electrode terminal 214a and at least one second electrode terminal 214b. Exemplarily, when the first electrode terminal 214a is a positive electrode terminal, it is used for electrical connection with the positive electrode tab 222a of the electrode assembly 22; when the second electrode terminal 214b is a negative electrode terminal, it is used for electrical connection with the negative electrode tab 222b of the electrode assembly 22. The first electrode terminal 214a and the positive electrode tab 222a can be directly connected or indirectly connected, and the negative electrode terminal 214b and the negative electrode tab 222b can be directly connected or indirectly connected. For example, the first electrode terminal 214a can be electrically connected to the positive electrode tab 222a via a connecting member 23, and the second electrode terminal 214b can be electrically connected to the negative electrode tab 222b via a connecting member 23. It should be understood that, in the embodiments of this application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as electrode tab 222.

[0140] In this embodiment, the walls of the housing 211 and the end cap 212 are both referred to as the walls of the battery cell 20. For the cuboid battery cell 20 shown in Figures 3 and 4, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 depends on the shape of the combined one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, that is, this plane does not have a wall, allowing communication between the inside and outside of the housing 211. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is an open face, that is, this end face does not have a wall, allowing communication between the inside and outside of the housing 211. The end cap 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The casing 211 is filled with an electrolyte, such as an electrolyte solution.

[0141] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on the actual usage requirements, the electrode assembly 22 inside the casing 211 can be one or more. For example, as shown in Figure 4, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the casing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the casing 211 can also be a cuboid structure.

[0142] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or more. For example, as shown in Figure 4, the battery cell 20 contains two electrode assemblies 22. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is cylindrical, the casing 211 can also be cylindrical; if the electrode assembly 22 is cuboid, the casing 211 can also be cuboid. In this embodiment, the material of the casing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0143] A pressure relief mechanism (not shown in the figure) may also be provided on the battery cell 20. The pressure relief mechanism is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0144] The pressure relief mechanism can be any of the possible pressure relief mechanisms. For example, the pressure relief mechanism can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism reaches a threshold; and / or, the pressure relief mechanism can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism reaches a threshold.

[0145] Figure 5 shows a cross-sectional schematic diagram of a battery cell 20 provided in an embodiment of this application. Exemplarily, Figure 5 may be a cross-sectional schematic diagram of the battery cell 20 shown in Figure 3.

[0146] In some implementations, as shown in Figures 3 to 5, the battery cell 20 includes: a housing 21, an electrode assembly 22, a first electrode terminal 214a, and a liquid injection hole 60. The housing 21 includes a first wall 50, and the electrode assembly 22 is housed inside the housing 21. The first electrode terminal 214a is disposed in a first region 510 of the first wall 50, and the liquid injection hole 60 is disposed in a second region 520 of the first wall 50 and penetrates the first wall 50 along its thickness direction. On a plane perpendicular to the thickness direction of the first wall 50, the projection of the first region 510 and the projection of the second region 520 do not overlap. Along the thickness direction of the first wall 50, the surface of the first region 510 that is away from the electrode assembly 22 is positioned further away from the electrode assembly 22 than the surface of the second region 520 that is also away from the electrode assembly 22.

[0147] It should be understood that the battery cell 20 in this embodiment can be a polyhedral structure of any shape. The outer shell 21 in this embodiment can refer to the housing 211 of the battery cell 20 or an end cap 212 for covering one opening of the housing 211. The outer shell 21 of the battery cell 20 in this embodiment can include multiple walls. The first wall 50 in this embodiment can be any wall of the housing 211 of the battery cell 20. It should also be understood that the first wall 50 can be the wall where the end cap 212 of the battery cell 20 is located.

[0148] For example, the first wall 50 may include, but is not limited to, the following: the first wall 50 may be the wall with the smallest area of ​​the housing 211 of the battery cell 20; the first wall 50 may also be the wall with the largest area of ​​the housing 211 of the battery cell 20; the first wall 50 may be the wall of the housing 211 of the battery cell 20 on which the electrode terminals 214 are provided; the first wall 50 may be the wall adjacent to the wall of the battery cell 20 on which the electrode terminals 214 are provided; the first wall 50 may be the wall opposite to the wall of the battery cell 20 on which the electrode terminals 214 are provided.

[0149] It should also be understood that the first electrode terminal 214a in this embodiment is disposed in the first region 510 of the first wall 50, which means that the first electrode terminal 214a can penetrate the first wall 50 along the thickness direction of the first wall 50, and the protruding portion of the first electrode terminal 214a facing the electrode assembly 22 can be electrically connected to the electrode tab 222 of the electrode assembly 22. Furthermore, on a plane perpendicular to the thickness direction of the first wall 50, the orthographic projection of the first region 510 covers the orthographic projection of the first electrode terminal 214a.

[0150] It should also be understood that, on a plane perpendicular to the thickness direction of the first wall 50, the orthographic projection of the second region 520 overlaps the orthographic projection of the injection hole 60. It should also be understood that the battery cell 20 further includes a seal 610, at least a portion of which is received within the injection hole 60 to seal it. The seal 610 and the injection hole 60 can be fixedly connected, for example, by snap-fit ​​or welding.

[0151] It should also be understood that the shape of the injection hole 60 provided on the first wall 50 in this embodiment can be set according to actual needs. On a plane perpendicular to the thickness direction of the first wall 50, the shape of the injection hole 60 can be circular, elliptical, polygonal, rectangular, etc. It should also be understood that the number of injection holes 60 provided on each first wall 50 can be set according to actual needs. For example, one or more of the above-mentioned injection holes 60 can be provided on the first wall 50.

[0152] It should also be understood that the ranges of the first region 510 and the second region 520 in the embodiments of this application can be selected according to actual needs. For example, on a plane perpendicular to the thickness direction of the first wall 50, the area of ​​the orthographic projection of the first region 510 can be greater than, less than or equal to the area of ​​the orthographic projection of the second region 520, and the orthographic projection of the first region 510 and the orthographic projection of the second region 520 do not overlap.

[0153] It should also be understood that, along the thickness direction of the first wall 50, the surface of the first region 510 away from the electrode assembly 22 can be the first surface 511 shown in FIG. 3, and the surface 521 of the second region 520 away from the electrode assembly 22 can be the second surface 521 shown in FIG. 3. The distance between the first surface 511 and the second surface 521 along the thickness direction of the first wall 50 can be set according to actual needs.

[0154] In this embodiment, by providing a first electrode terminal 214a in a first region 510 of a first wall 50, and providing a liquid injection hole 60 penetrating the first wall 50 along its thickness direction in a second region 520 of the first wall 50, the projections of the first region 510 and the second region 520 do not overlap on a plane perpendicular to the thickness direction of the first wall 50. Furthermore, in a plane perpendicular to the thickness direction of the first wall 50, the surface of the first region 510 that is farther from the electrode assembly 22 is positioned farther from the electrode assembly 22 than the surface of the second region 520 that is farther from the electrode assembly 22. This effectively reduces the risk of electrolyte splashing onto the first electrode terminal 214a during the electrolyte injection process of the battery cell 20, thereby reducing the risk of corrosion to the casing 21 of the battery cell 20 and improving the performance of the battery cell 20.

[0155] Figure 6 shows a cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application. As shown in Figure 6, the liquid injection hole 60 is disposed on the second surface 521 of the second region 520, and the liquid injection hole is disposed between the first electrode terminal 214a and the second electrode terminal 214b.

[0156] In some implementations, as shown in Figures 5 and 6, the first wall 50 is further provided with a second electrode terminal 214b. On a plane perpendicular to the thickness direction of the first wall 50, the minimum distance between the injection hole 60 and the first electrode terminal 214a is greater than or equal to the minimum distance between the injection hole 60 and the second electrode terminal 214b, and the polarities of the first electrode terminal 214a and the second electrode terminal 214b are opposite. Thus, in this embodiment, by setting the minimum distance between the injection hole 60 and the first electrode terminal 214a to be greater than or equal to the minimum distance between the injection hole 60 and the second electrode terminal 214b, and by setting the polarities of the first electrode terminal 214a and the second electrode terminal 214b to be opposite, the risk of electrolyte splashing into the area where the first electrode terminal 214a is located can be effectively reduced, effectively reducing the risk of corrosion of the casing 21 of the battery cell 20, thereby improving the performance of the battery cell 20.

[0157] In some implementations, the housing 21 includes a housing 211. If the material of the housing 211 is steel, the first electrode terminal 214a is a positive electrode terminal; or if the material of the housing 211 is aluminum, the first electrode terminal 214a is a negative electrode terminal.

[0158] It should be understood that when the casing 211 is made of steel, if the first electrode terminal 214a is set as the positive electrode terminal, the presence of iron and chromium in the steel will easily lead to the formation of chromium fluoride and iron fluoride at the positive terminal, causing corrosion of the casing 211, reducing the structural strength of the battery cell 20, and affecting its performance. Similarly, when the casing 211 is made of aluminum, if the first electrode terminal 214a is set as the negative electrode terminal, a lithium-aluminum alloy will easily form at the negative terminal, causing corrosion of the casing 211, reducing the structural strength of the battery cell 20, and affecting its performance.

[0159] In this embodiment, on a plane perpendicular to the thickness direction of the first wall 50, by setting the minimum distance between the injection hole 60 and the first electrode terminal 214a to be greater than or equal to the minimum distance between the injection hole 60 and the second electrode terminal 214b, the first electrode terminal 214a and the second electrode terminal 214b have opposite polarities. When the material of the housing 211 includes steel, the first electrode terminal 214a is a positive electrode terminal; or, when the material of the housing 211 includes aluminum, the first electrode terminal 214a is a negative electrode terminal. That is, for housings of different material types, the risk of electrolyte splashing to the first electrode terminal 214a is further reduced, effectively reducing the risk of corrosion of the outer shell 21 of the battery cell 20, thereby improving the performance of the battery cell 20.

[0160] Figure 7 shows a structural schematic diagram of a battery cell 20 provided in another embodiment of this application. Figure 8 shows a cross-sectional schematic diagram of a battery cell 20 provided in one embodiment of this application. Figure 9 shows a cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application. Exemplarily, Figure 8 may be a cross-sectional schematic diagram of the battery cell 20 shown in Figure 7.

[0161] In some implementations, as shown in Figures 7 to 9, a protruding structure 70 is provided on the surface of the first wall 50 away from the electrode assembly 22. The protruding structure 70 protrudes in a direction away from the electrode assembly 22 and is located between the injection hole 60 and the first electrode terminal 214a.

[0162] It should be understood that the shape of the protruding structure 70 can be set according to actual needs. For example, on a plane perpendicular to the thickness direction of the first wall 50, the protruding structure 70 can be a rectangular structure as shown in Figures 7 and 8, or the protruding structure 70 can also be a circular structure, a polygonal structure, an annular structure, etc. It should also be understood that the size of the protrusion of the protruding structure 70 in the direction away from the electrode assembly 22 can be set according to actual needs.

[0163] In this embodiment, a protruding structure 70 is provided on the surface of the first wall 50 away from the electrode assembly 22. The protruding structure 70 protrudes in a direction away from the electrode assembly 22 and is located between the injection hole 60 and the first electrode terminal 214a. During the process of injecting electrolyte into the battery cell 20, the protruding structure 70 can block the splashing of electrolyte, thereby effectively reducing the risk of electrolyte splashing to the first electrode terminal 214a, reducing the risk of corrosion of the casing 21 of the battery cell 20, and thus improving the performance of the battery cell 20.

[0164] In some implementations, the protrusion structure 70 gradually increases in size in the direction perpendicular to the thickness of the first wall 50 along the protrusion direction of the protrusion structure 70.

[0165] It should be understood that the gradual increase in the size of the protruding structure 70 in the direction perpendicular to the thickness of the first wall 50 along the protruding direction of the protruding structure 70 can mean that the size of the protruding structure 70 in the direction perpendicular to the thickness of the first wall 50 increases intermittently or continuously.

[0166] In this embodiment, along the protrusion direction of the protrusion structure 70, by setting the size of the protrusion structure 70 in the direction perpendicular to the thickness of the first wall 50 to gradually increase, that is, during the electrolyte injection process of the battery cell 20, the part of the surface of the protrusion structure 70 facing the electrode assembly 22 can block the splashing of electrolyte, thereby further reducing the risk of electrolyte splashing to the first electrode terminal 214a, thereby reducing the risk of corrosion of the casing 21 of the battery cell 20, and thus improving the performance of the battery cell 20.

[0167] In some implementations, the protruding structure 70 is integrally stamped with the first wall 50. Thus, in this embodiment, by integrally stamping the protruding structure 70 with the first wall 50, the processing and manufacturing of the outer casing 21 of the battery cell 20 is facilitated, thereby improving the manufacturing performance of the battery cell 20.

[0168] In some implementations, as shown in Figures 7 and 8, the protrusion structure 70 includes a first protrusion structure 710 disposed on the surface of the first region 510 away from the electrode assembly 22, the first protrusion structure 710 being disposed near the injection hole 60.

[0169] It should be understood that the first protrusion structure 710 may be disposed on the first surface 511 of the first region 510, and the first protrusion structure 710 is disposed in the region of the first surface 511 near the injection hole 60, so that during the process of injecting electrolyte into the battery cell 20, the portion of the surface of the first protrusion structure 710 facing the injection hole 60 can block the splashing of electrolyte.

[0170] In this embodiment, by configuring the protrusion structure 710 to include a first protrusion structure 710, which is disposed on the surface of the first region 510 away from the electrode assembly 22 and close to the injection hole 60, during the electrolyte injection process of the battery cell 20, the first protrusion structure 710 can block the splashing of electrolyte on the side facing the electrode assembly 22, thereby further reducing the risk of electrolyte splashing to the area where the first electrode terminal 214a is located, thereby reducing the risk of corrosion of the casing 21 of the battery cell 20 and improving the performance of the battery cell 20.

[0171] In some implementations, as shown in FIG9, the protrusion structure 70 includes a second protrusion structure 720 disposed in the second region 520 away from the electrode assembly 22, the second protrusion structure 720 being disposed at least partially around the outer periphery of the injection hole 60.

[0172] It should be understood that the shape of the second protrusion structure 720 on the plane perpendicular to the thickness direction of the first wall 50 can be set according to actual needs. For example, the shape of the second protrusion structure 720 can be set as a circular ring, a rectangular ring, a polygonal ring, a waist-shaped ring, an irregular ring, etc. When the shape of the second protrusion structure 720 is set as a circular ring, the second protrusion structure 720 can be a continuous circular ring or a discontinuous circular ring. When the shape of the second protrusion structure 720 is set as a rectangular ring, the second protrusion structure 720 can be a continuous rectangular ring or a discontinuous rectangular ring.

[0173] In this embodiment, by configuring the protrusion structure 70 to include a second protrusion structure 720, the second protrusion structure 720 is disposed on the surface of the second region 520 away from the electrode assembly 22. At least a portion of the second protrusion structure 720 is configured to surround the outer periphery of the injection hole 60. That is, during the process of injecting electrolyte into the battery cell 20, the second protrusion structure 720 can block the splashing of electrolyte, thereby further reducing the risk of electrolyte splashing to the first electrode terminal 214a, thereby reducing the risk of corrosion of the casing 21 of the battery cell 20, and thus improving the performance of the battery cell 20.

[0174] In some implementations, as shown in Figure 9, the second protrusion structure 720 is an annular structure, with the inner ring of the annular structure surrounding the injection hole 60.

[0175] It should be understood that the annular structure can be configured according to the shape of the injection hole 60. For example, if the shape of the injection hole 60 in the plane perpendicular to the thickness direction of the first wall 50 is circular, the annular structure can be configured as a circular annular structure. Alternatively, if the shape of the injection hole 60 in the plane perpendicular to the thickness direction of the first wall 50 is rectangular, the annular structure can be configured as a rectangular structure.

[0176] In this embodiment of the application, by setting the second protrusion structure 720 as an annular structure, and the inner ring of the annular structure surrounding the liquid injection hole 60, the processing and manufacturing of the second protrusion structure 720 is facilitated, thereby improving the processing and manufacturing efficiency of the battery cell 20 and taking into account both the performance of the battery cell 20 in use and the manufacturing performance.

[0177] In some implementations, the second protrusion structure 720 is integrally stamped with the first wall 50. Thus, in this embodiment, by integrally stamping the second protrusion structure 720 with the first wall 50, the processing and manufacturing of the outer casing 21 of the battery cell 20 is facilitated, thereby improving the manufacturing performance of the battery cell 20.

[0178] In some implementations, as shown in Figures 3 to 6, a connecting portion 530 is formed between the first region 510 and the second region 520. The surface of the connecting portion 530 away from the electrode assembly 22 is provided with a protruding structure, and / or the surface of the connecting portion 530 away from the electrode assembly 22 is provided with a groove structure.

[0179] It should be understood that a stepped connection 530 can be formed between the first region 510 and the second region 520. That is, during the process of injecting electrolyte into the battery cell 20, the connection 530 can block the splashing of electrolyte, thereby effectively reducing the risk of electrolyte splashing to the area where the first electrode terminal 214a is located.

[0180] It should also be understood that the connecting portion 530 may have a trapezoidal structure in the direction from the second surface 521 toward the first surface 511, and the connecting portion 530 may include a multi-step structure, such as a two-step or three-step structure. Specifically, the number of steps of the connecting portion 530 can be set according to actual needs.

[0181] It should also be understood that the connecting portion 530 can be integrally formed with the first region 510 or the second region 520, or can be formed separately. For example, when the connecting portion 530 is integrally formed with the first region 510 and the second region 520, the connecting portion 530 can be integrally injection molded with the first region 510 and the second region 520, that is, the connecting portion 530 can be integrally formed with the first wall 50. Alternatively, when the connecting portion 530 is formed separately from the first region 510 and the second region 520, the connecting portion 530 can be welded to the first region 510 and the second region 520.

[0182] It should also be understood that the surface of the connection portion 530 away from the electrode assembly 22 may be provided with at least one protruding structure (not shown in the figure), such as a stepped structure shown in Figures 3 to 6, which has been used to block the splashing of electrolyte. It should also be understood that the surface of the connection portion 530 away from the electrode assembly 22 may be provided with at least one groove structure (not shown in the figure) to store or contain electrolyte, thereby effectively reducing the risk of electrolyte splashing into the area where the first electrode terminal 214a is located.

[0183] In this embodiment, by forming a connection portion 530 between the first region 510 and the second region 520, and by providing a protruding structure on the surface of the connection portion 530 away from the electrode assembly 22 to block the splashing of electrolyte, and / or by providing a groove structure on the surface of the connection portion 530 away from the electrode assembly 22 to store or contain electrolyte, the connection portion 530 effectively reduces the risk of electrolyte splashing to the area where the first electrode terminal 214a is located, thereby reducing the risk of corrosion of the casing 21 of the battery cell 20 and improving the performance of the battery cell 20.

[0184] According to some embodiments of this application, this application also provides a battery device 10, including a plurality of battery cells 20, wherein the battery cell 20 is the battery cell 20 in any of the above embodiments.

[0185] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be the vehicle 1 shown in FIG1 above, or any electrical device using the battery device 10.

[0186] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0187] According to some embodiments of this application, this application also provides an energy storage device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to store electrical energy for the energy storage device.

[0188] According to some embodiments of this application, referring again to Figures 3 to 9 above, a battery cell 20 is provided. The battery cell 20 includes: a housing 21, an electrode assembly 22, a first electrode terminal 214a, and a liquid injection hole 60. The housing 21 includes a first wall 50. The electrode assembly 22 is housed inside the housing 21. The first electrode terminal 214a is disposed in a first region 510 of the first wall 50. The liquid injection hole 60 is disposed in a second region 520 of the first wall 50 and penetrates the first wall 50 along its thickness direction. On a plane perpendicular to the thickness direction of the first wall 50, the projection of the first region 510 and the projection of the second region 520 do not overlap. Along the thickness direction of the first wall 50, the surface of the first region 510 that is away from the electrode assembly 22 is positioned further away from the electrode assembly 22 than the surface of the second region 520 that is also away from the electrode assembly 22. The first wall 50 is also provided with a second electrode terminal 214b. On a plane perpendicular to the thickness direction of the first wall 50, the minimum distance between the injection hole 60 and the first electrode terminal 214a is greater than or equal to the minimum distance between the injection hole 60 and the second electrode terminal 214b. The polarities of the first electrode terminal 214a and the second electrode terminal 214b are opposite. The outer casing 21 includes a housing 211. When the material of the housing 211 includes steel, the first electrode terminal 214a is a positive electrode terminal; or, when the material of the housing 211 includes aluminum, the first electrode terminal 214a is a negative electrode terminal.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 in that, include: The outer shell, including the first wall; Electrode assemblies are housed inside the housing; The first electrode terminal is disposed in the first region of the first wall; The injection hole is located in the second region of the first wall and penetrates the first wall along the thickness direction of the first wall. On a plane perpendicular to the thickness direction of the first wall, the projection of the first region and the projection of the second region do not overlap. Wherein, along the thickness direction of the first wall, the surface of the first region away from the electrode assembly is positioned further away from the electrode assembly than the surface of the second region away from the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The first wall is also provided with a second electrode terminal. On a plane perpendicular to the thickness direction of the first wall, the minimum distance between the injection hole and the first electrode terminal is greater than or equal to the minimum distance between the injection hole and the second electrode terminal. The polarities of the first electrode terminal and the second electrode terminal are opposite.

3. The battery cell according to claim 2, characterized in that, The housing includes a shell, and when the shell is made of steel, the first electrode terminal is a positive electrode terminal; or when the shell is made of aluminum, the first electrode terminal is a negative electrode terminal.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The surface of the first wall away from the electrode assembly is provided with a protruding structure, which protrudes in a direction away from the electrode assembly and is located between the injection hole and the first electrode terminal.

5. The battery cell according to claim 4, characterized in that, Along the protruding direction of the protruding structure, the dimension of the protruding structure gradually increases in the thickness direction perpendicular to the first wall.

6. The battery cell according to claim 5, characterized in that, The protruding structure is integrally stamped with the first wall.

7. The battery cell according to any one of claims 4 to 6, characterized in that, The protrusion structure includes a first protrusion structure disposed on the surface of the first region away from the electrode assembly, the first protrusion structure being disposed close to the injection hole.

8. The battery cell according to any one of claims 4 to 7, characterized in that, The protrusion structure includes a second protrusion structure disposed in the second region away from the electrode assembly, the second protrusion structure being disposed at least partially around the outer periphery of the injection hole.

9. The battery cell according to claim 8, characterized in that, The second protrusion structure is an annular structure, and the inner ring of the annular structure surrounds the injection hole.

10. The battery cell according to any one of claims 1 to 9, characterized in that, A connection portion is formed between the first region and the second region. The surface of the connection portion away from the electrode assembly is provided with a protruding structure, and / or the surface of the connection portion away from the electrode assembly is provided with a groove structure.

11. A battery device, characterized in that, include: Multiple battery cells, wherein the battery cells are as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, include: The battery device of claim 11, wherein the battery device is used to provide electrical energy to the electrical device.

13. An energy storage device, characterized in that, include: The battery device of claim 11, wherein the battery device is used to store electrical energy for the energy storage device.

Images