Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. A battery cell includes a housing, a first electrode terminal, a second electrode terminal, and an electrode assembly. The shell comprises a first wall, and the first electrode terminal and the second electrode terminal are arranged on the first wall at intervals in the first direction. The electrode assembly is housed within the housing. The first wall is provided with a liquid injection hole used for injecting electrolyte into the shell. The liquid injection hole is located in the side, away from the second electrode terminal, of the first electrode terminal in the first direction. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The battery cell of the battery is assembled into an electrode assembly (bare cell) by winding or stacking the positive electrode sheet, the negative electrode sheet and the separator, which is then placed in a casing and electrically connected to the electrode terminals provided on the casing, and then the electrolyte is injected through the injection hole.

[0004] In a battery cell, the injection hole is usually arranged between two electrode terminals, but other structural parts, such as adapters, are usually arranged between the two electrode terminals. In order to avoid the injection hole, it is necessary to design an avoidance structure on these structural parts, which reduces the reliability of these structural parts and thus affects the reliability of the battery cell as a whole. Utility Model Content

[0005] In view of the above problems, the embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the reliability of the battery cell.

[0006] In a first aspect, an embodiment of the present application provides a battery cell, comprising a housing, a first electrode terminal, a second electrode terminal and an electrode assembly. The housing comprises a first wall, and the first electrode terminal and the second electrode terminal are arranged on the first wall at intervals along a first direction. The electrode assembly is accommodated in the housing. The first wall is provided with an injection hole for injecting electrolyte into the housing. Along the first direction, the injection hole is located on a side of the first electrode terminal away from the second electrode terminal.

[0007] In the technical solution of the embodiment of the present application, by setting the injection hole on the side of the first electrode terminal away from the second electrode terminal, other structural parts arranged between the two electrode terminals do not need to be provided with an avoidance structure to avoid the injection hole, thereby improving the reliability of these structural parts, thereby improving the reliability of the battery cell.

[0008] In some embodiments, the electrode assembly includes a main body, a first pole tab and a second pole tab. The first pole tab and the second pole tab are both arranged on a side of the main body facing the first wall. The battery cell also includes a first adapter and a second adapter. The first adapter is used to electrically connect the first pole tab to the first electrode terminal. The second adapter is used to electrically connect the second pole tab to the second electrode terminal.

[0009] In the above solution, by arranging both the first tab and the second tab of the electrode assembly on the same side of the main body, and making the first adapter and the second adapter located on the same side of the electrode assembly, the first tab, the second tab, the first adapter, and the second adapter make full use of the distance between the main body and the first wall in the thickness direction of the first wall, thereby saving the space occupied by the first tab, the second tab, the first adapter, and the second adapter in the thickness direction of the first wall, so as to improve the energy density of the battery cell having such an electrode assembly.

[0010] In some embodiments, along the thickness direction of the first wall, the projection of the first adapter on the first wall is the first projection, and the projection of the second adapter on the first wall is the second projection. Along the first direction, the liquid injection hole is located on the side of the first projection away from the second projection.

[0011] In the above solution, the liquid injection hole is located on the side of the first projection away from the second projection, so that the part of the first adapter close to the second adapter and the second adapter do not need to be provided with an avoidance structure to avoid the liquid injection hole, thereby improving the reliability of the part of the first adapter close to the second adapter and the second adapter, and thus improving the reliability of the battery cell.

[0012] In some embodiments, along the second direction, the liquid injection hole does not overlap with the first projection, and the liquid injection hole does not overlap with the second projection. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other in pairs.

[0013] In the above solution, along the second direction, the liquid injection hole does not overlap with the first projection, and the liquid injection hole does not overlap with the second projection. Thus, neither the first adapter nor the second adapter needs to be provided with an avoidance structure to avoid the liquid injection hole. On the one hand, the part of the first adapter connected to the first tab does not need to be provided with an avoidance structure to avoid the liquid injection hole, so that the cross-sectional area of the part of the first adapter for passing current does not need to be reduced due to avoiding the liquid injection hole, thereby improving the current-carrying capacity of the first adapter; on the other hand, the part of the second adapter connected to the second tab does not need to be provided with an avoidance structure to avoid the liquid injection hole, so that the cross-sectional area of the part of the second adapter for passing current does not need to be reduced due to avoiding the liquid injection hole, thereby improving the current-carrying capacity of the second adapter.

[0014] In some embodiments, the battery cell further includes a first insulating member. Along the thickness direction of the first wall, the first insulating member is located between the first wall and the electrode assembly. The first insulating member is provided with a first cavity, and the first cavity is used to communicate the liquid injection hole and the space on the side of the first insulating member away from the first wall.

[0015] In the above solution, a first cavity communicating with the liquid injection hole and the space on the side of the first insulating member facing away from the first wall is provided in the first insulating member. When injecting electrolyte into the housing, the electrolyte enters the first cavity through the liquid injection hole, and after being buffered by the first cavity, it enters the space on the side of the first insulating member facing away from the first wall, thereby reducing the flow rate of the electrolyte, and thus reducing the risk of damaging the electrode assembly due to too fast a flow rate of the electrolyte.

[0016] In some embodiments, the first insulating member includes a first base body, a first convex portion and a second convex portion. Along the first direction, the first convex portion and the second convex portion are respectively arranged at two ends of the first base body, and the first convex portion and the second convex portion protrude from the side of the first base body facing the electrode assembly, and the first cavity is arranged in the first convex portion.

[0017] In the above solution, by respectively arranging a first convex portion and a second convex portion protruding towards the electrode assembly along the thickness direction of the first wall at opposite ends of the first base body in the first direction, when the electrode assembly approaches the first wall along the thickness direction of the first wall, the first convex portion and the second convex portion are in contact with the electrode assembly to limit the excessive movement of the electrode assembly along the thickness direction of the first wall, thereby reducing the risk of disconnection of the connection between the tab and the adapter caused by the excessive movement of the electrode assembly along the thickness direction of the first wall, which leads to an internal open circuit of the battery cell, and improving the reliability of the battery cell.

[0018] In some embodiments, a first through hole corresponding to the position of the liquid injection hole is provided on the side of the first insulating member facing the first wall, and the first through hole communicates with the first cavity. The first insulating member further includes a shielding portion, and the shielding portion is arranged in the first cavity and at least partially shields the first through hole along the thickness direction of the first wall.

[0019] In the above solution, a shielding portion is arranged in the first cavity and the shielding portion shields the first through hole along the thickness direction of the first wall. When the electrolyte enters the first cavity through the first through hole along the thickness direction of the first wall, the electrolyte will contact the shielding portion, so that the shielding portion hinders the flow of the electrolyte, thereby reducing the fluidity of the electrolyte, and thus reducing the risk of damaging the electrode assembly due to too fast a flow rate of the electrolyte, and improving the reliability of the battery cell.

[0020] In some embodiments, the first convex portion has a first surface facing the second convex portion along the first direction, and a first opening communicating with the first cavity is formed on the first surface.

[0021] In the above scheme, since a first opening connected to the first cavity is provided on the first surface of the first protrusion facing the second protrusion along the first direction, when the electrolyte enters the space on the side of the first insulating member away from the first wall from the first cavity, the electrolyte in the first cavity can enter the space on the side of the first insulating member away from the first wall through the first opening, thereby reducing the risk of the electrolyte being retained in the first cavity and improving the degree of electrolyte infiltration into the electrode assembly, which is beneficial to increasing the service life of the battery cell.

[0022] In some embodiments, the first protrusion has a second surface abutting against the main body, and the second surface is provided with a plurality of second through holes communicating with the first cavity, and the plurality of second through holes are arranged in an array.

[0023] In the above scheme, since a plurality of second through holes arranged in an array are provided on the second surface abutting against the main body, when the electrolyte enters the space on the side of the first insulating member away from the first wall from the first cavity, the electrolyte will contact the wall portion of the first cavity where the second through hole is not provided, so that the wall portion of the first cavity where the second through hole is not provided will hinder the flow of the electrolyte, thereby reducing the fluidity of the electrolyte, thereby reducing the risk of damaging the electrode assembly due to excessively fast electrolyte flow rate, thereby improving the reliability of the battery cell.

[0024] In some embodiments, the first protrusion has a second surface abutting against the main body, and the second surface is provided with a second opening communicating with the first cavity.

[0025] In the above scheme, since the second opening is provided on the second surface abutting against the main body, when the electrolyte enters the space on the side of the first insulating member away from the first wall from the first cavity, the electrolyte in the first cavity can directly enter the space on the side of the first insulating member away from the first wall through the second opening, thereby reducing the time for the electrolyte to pass through the first cavity and enter the space on the side of the first insulating member away from the first wall, thereby increasing the injection speed and further increasing the production efficiency of the battery cell.

[0026] In some embodiments, the first insulating member further includes a third protrusion, the third protrusion protrudes from a side of the first substrate facing the electrode assembly, and along the first direction, the third protrusion is located between the first protrusion and the second protrusion. At least a portion of the first transition member is located between the first protrusion and the third protrusion, and at least a portion of the second transition member is located between the second protrusion and the third protrusion.

[0027] In the above solution, since a third convex portion is provided between the first convex portion and the second convex portion in the first direction, and at least part of the first adapter is located between the first convex portion and the third convex portion, and at least part of the second adapter is located between the second convex portion and the third convex portion, the third convex portion can limit the movement of the first adapter and the second adapter in the first direction, thereby reducing the risk of internal short circuit of the battery cell caused by the overlap of the first adapter and the second adapter, and improving the reliability of the battery.

[0028] In some embodiments, the housing includes a housing body and a cover plate. The housing body has an opening, and the cover plate seals the opening. The first wall is the cover plate, or the first wall is the wall portion of the housing body opposite to the cover plate.

[0029] In the above solution, the design of the opening facilitates accommodating the electrode assembly in the housing body through the opening, and the cover plate seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly and improving the reliability of the battery cell.

[0030] In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in the first aspect embodiment.

[0031] In a third aspect, an embodiment of the present application provides an electrical device, including the battery provided in the second aspect embodiment. The battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

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

[0034] Figure 2 Stereo exploded view of a battery provided in some embodiments of the present application;

[0035] Figure 3 Stereo exploded view of a battery cell provided in some embodiments of the present application;

[0036] Figure 4 Structural schematic diagram of a first wall provided in some embodiments of the present application;

[0037] Figure 5 Structural schematic diagram of a first adapter or a second adapter provided in some embodiments of the present application;

[0038] Figure 6Another three-dimensional exploded view of a battery cell provided by some embodiments of the present application;

[0039] Figure 7 A cross-sectional view of a first insulating member provided by some embodiments of the present application;

[0040] Figure 8 For Figure 7 An enlarged view of part A in

[0041] Figure 9 A schematic structural diagram of a first insulating member provided by some embodiments of the present application;

[0042] Figure 10 A schematic structural diagram of another first insulating member provided by some embodiments of the present application;

[0043] Figure 11 A three-dimensional exploded view of a housing provided by some embodiments of the present application;

[0044] Figure 12 A three-dimensional exploded view of another housing provided by some embodiments of the present application.

[0045] Icons: 1000 - Vehicle;

[0046] 100 - Battery; 200 - Controller; 300 - Motor;

[0047] 10 - Box body; 11 - First box body; 12 - Second box body;

[0048] 20 - Battery cell; 21 - Housing; 211 - First wall; 211A - Liquid injection hole; 211B - Plugging member; 211C - Pressure relief mechanism; 212 - Shell; 213 - Cover plate;

[0049] 22 - First electrode terminal; 221 - Second electrode terminal;

[0050] 23 - Electrode assembly; 231 - First tab; 232 - Second tab; 233 - Main body;

[0051] 24 - First adapter; 24A - First projection; 241 - First main body portion; 242 - First protrusion; 242A - First end wall; 242B - First peripheral wall;

[0052] 25 - Second adapter; 25A - Second projection; 251 - Second main body portion; 252 - Second protrusion; 252A - Second end wall; 252B - Second peripheral wall;

[0053] 26 - First insulating member; 261 - First cavity; 262 - First through hole; 262A - First secondary hole; 263 - Shielding portion; 263A - Third end wall; 263B - Third peripheral wall; 264 - First surface; 264A - First opening; 265 - Second surface; 265A - Second opening; 265B - Second through hole;

[0054] 26A - First base body; 26B - First convex portion; 26C - Second convex portion; 26D - Third convex portion;

[0055] X - Thickness direction of the first wall; Y - First direction; Z - Second direction. Detailed implementation manners

[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 in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

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

[0058] Referring to "embodiments" in the present application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0059] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0060] The term "and / or" in this application merely describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0061] In the embodiments of this application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0062] The term "a plurality of" as used in this application refers to two or more (including two).

[0063] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging to continue use after discharging.

[0064] The battery cell includes but is not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0065] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0066] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet 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.

[0067] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on either or both of the two opposite surfaces of the positive electrode current collector.

[0068] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, 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 (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0069] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), composites of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), composites of lithium manganese phosphate and carbon, lithium manganese iron phosphate, composites of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides can 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and their modified compounds, etc. at least one of them.

[0070] In some embodiments, the positive electrode may employ a porous metal. The porous metal may be porous nickel, porous copper, porous aluminum, porous alloy, or porous carbon, etc. When the porous metal serves as the positive electrode, the positive electrode active material may not be provided on the surface of the porous metal. Of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited in the porous metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0071] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0072] As an example, the negative electrode current collector may employ a metal foil, a porous metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. may be used. The porous metal may be porous nickel, porous copper, porous aluminum, porous alloy, etc. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0074] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0075] As an example, the negative electrode active material may employ the negative electrode active materials known in the art for 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. The 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. The tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

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

[0077] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical stability and mechanical stability.

[0078] As an example, the material of the separator membrane can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a single component located between the positive and negative electrodes, or attached to the surfaces of the positive and negative electrodes.

[0079] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0080] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0081] In some embodiments, the electrolyte salt can include 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 difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0082] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0083] Among them, the gel electrolyte includes a polymer as the backbone network of the electrolyte, combined with an ionic liquid-lithium salt.

[0084] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0085] In some embodiments, the electrode assembly is a stacked structure.

[0086] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0087] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0088] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0089] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheet or negative electrode sheet.

[0090] As an example, the separators can be continuously arranged and are arranged between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0091] In some embodiments, the shape of the electrode assembly can be cylindrical, flat or prismatic, etc.

[0092] In some embodiments, the electrode assembly is provided with electrode tabs, and the electrode tabs can conduct current out of the electrode assembly. The electrode tabs include a positive electrode tab and a negative electrode tab.

[0093] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum plastic film, etc.

[0094] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0095] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0096] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0097] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0098] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0099] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0100] The pressure relief mechanism refers to an element or component that actuates to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. This threshold design varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell. The pressure relief mechanism can be in the form of, for example, an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve, or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0101] As used in this application, "actuate" means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The actions generated by the pressure relief mechanism may include, but are not limited to: at least a part of the pressure relief mechanism rupturing, breaking, being torn, or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell can be relieved under a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0102] The emissions from the battery cell mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0103] The pressure relief mechanism on the battery cell has an important impact on the safety of the battery. For example, when short circuit, overcharge and other phenomena occur, it may cause thermal runaway inside the battery cell, resulting in a sudden increase in pressure or temperature. In this case, the internal pressure and temperature can be released outward by actuating the pressure relief mechanism to reduce the risk of explosion and fire of the battery cell.

[0104] The battery has outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, and small self-discharge coefficient, and is an important part of the development of new energy today.

[0105] A battery cell generally includes a housing and an electrode assembly accommodated in the housing. The housing includes a first wall, and a first electrode terminal and a second electrode terminal are spaced apart on the first wall. The positive electrode and the negative electrode in the electrode assembly are electrically connected to the first electrode terminal and the second electrode terminal provided on the first wall respectively. In the related art, generally, an injection hole for injecting electrolyte into the housing and a part of the mechanism of the battery cell (such as a pressure relief mechanism) are jointly arranged in a partial area of the first wall between the first electrode terminal and the second electrode terminal. However, in order to reduce the probability of mutual interference between the injection hole and other mechanisms between the two electrode terminals, it is necessary to provide an avoidance structure on other mechanisms, which further makes the assembly of the battery cell more complex, thereby reducing the production qualification rate of the battery cell.

[0106] In view of this, in order to improve the problem that the avoidance structure on other mechanisms between the first electrode terminal and the second electrode terminal of the battery cell increases due to the injection hole being arranged between the first electrode terminal and the second electrode terminal, which further makes the assembly of the battery cell more complex, thereby reducing the production qualification rate of the battery cell. Some embodiments of the present application provide a battery cell, wherein, a first wall is provided with an injection hole for injecting electrolyte into the housing. Along the arrangement direction of the first electrode terminal and the second electrode terminal, the injection hole is located on a side of the first electrode terminal far from the second electrode terminal. By arranging the injection hole on the side of the first electrode terminal far from the second electrode terminal, it is not necessary to provide an avoidance structure on other structural members arranged between the two electrode terminals to avoid the injection hole, which further improves the reliability of these structural members, thereby improving the reliability of the battery cell.

[0107] Embodiments of the present application provide an electrical device using a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0108] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device according to an embodiment of the present application for illustration.

[0109] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. Inside vehicle 1000, there is a battery 100. Battery 100 can be arranged at the bottom of vehicle 1000, or at the head of vehicle 1000, or at the tail of vehicle 1000. Battery 100 can be used to supply power to vehicle 1000. For example, battery 100 can be used as the operating power source or the power consumption source of vehicle 1000, etc. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery 100 to supply power to motor 300. For example, it is used for the working power consumption requirements during the start, navigation, and driving of vehicle 1000.

[0110] In some embodiments of the present application, battery 100 can not only be used as the operating power source or the power consumption source of vehicle 1000, but also be used as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0111] Please refer to Figure 2 , Figure 2 Exploded perspective view of battery 100 provided by some embodiments of the present application. Battery 100 includes a box body 10 and battery cells 20. Battery cells 20 are accommodated in box body 10.

[0112] Among them, box body 10 is used to provide an assembly space for battery cells 20, and box body 10 can adopt various structures. In some embodiments, box body 10 can include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0113] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube, etc. Exemplarily, in Figure 2 , the shape of box body 10 is a cuboid.

[0114] In the battery 100, the battery cells 20 disposed in the box 10 may be one or more. When there are multiple battery cells 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 may also be in the form of multiple battery cells 20 first connected in series, in parallel, or in a series-parallel combination to form battery 100 modules, and then the multiple battery 100 modules are connected in series, in parallel, or in a series-parallel combination to form a whole, and the whole is accommodated in the box 10.

[0115] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for connecting the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0116] Among them, each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a prism, or other shapes, etc. Exemplarily, in Figure 2 the battery cell 20 is a cuboid.

[0117] According to some embodiments of the present application, a battery cell 20 is provided. Please refer to Figure 3 Figure 3 which is an exploded perspective view of the battery cell 20 provided by some embodiments of the present application.

[0118] The battery cell 20 includes a housing 21, a first electrode terminal 22, a second electrode terminal 221, and an electrode assembly 23. The housing 21 includes a first wall 211, and the first electrode terminal 22 and the second electrode terminal 221 are spaced apart along a first direction Y on the first wall 211. The electrode assembly 23 is accommodated in the housing 21. Among them, the first wall 211 is provided with a liquid injection hole 211A for injecting electrolyte into the housing 21. Along the first direction Y, the liquid injection hole 211A is located on a side of the first electrode terminal 22 away from the second electrode terminal 221.

[0119] The housing 21 is a component for accommodating the electrode assembly 23, and the housing 21 may also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, an accommodation cavity is formed inside the housing 21 for accommodating the electrode assembly 23.

[0120] In some embodiments, the material of the outer shell 21 can be metal or a combination of metal and non-metal. For example, the outer shell 21 can be made of metal, such as aluminum, copper, iron, aluminum, steel, or aluminum alloy, etc. Or, for another example, a part of the outer shell 21 can be made of metal, and the remaining part can be made of non-metal. For example, the first wall 211 can be made of metal, and other parts of the outer shell 21 can be made of non-metal materials.

[0121] The outer shell 21 can be of various shapes, such as a cylinder or a prism structure, etc. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cuboid structure, then the outer shell 21 with a cuboid structure can be selected.

[0122] The first wall 211 is a part of the structure of the outer shell 21, and the first electrode terminal 22 and the second electrode terminal 221 can be insulatingly installed on the first wall 211.

[0123] The first wall 211 can be made of a conductive material, such as a metal material. For example, the first wall 211 is made of materials such as aluminum, copper, iron, aluminum, steel, or aluminum alloy.

[0124] In some embodiments, the first wall 211 can be the cover plate 213 of the outer shell 21, and the housing 212 of the outer shell 21 surrounds the edge of the first wall 211.

[0125] In some embodiments, the first wall 211 can be connected to the housing 212 by welding, bonding, snap connection, or other connection methods. In some embodiments, the first wall 211 and the housing 212 can be integrally formed.

[0126] The thickness direction X of the first wall can be parallel to the height direction of the battery cell 20, the first direction Y can be parallel to the length direction of the battery cell 20, and the second direction Z can be parallel to the width direction of the battery cell 20.

[0127] Both the first electrode terminal 22 and the second electrode terminal 221 are components insulatingly installed on the first wall 211. The first electrode terminal 22 and the second electrode terminal 221 are respectively used for electrically connecting to the positive electrode and the negative electrode of the electrode assembly 23. So that current flows into the electrode assembly 23 through the first electrode terminal 22 and flows out of the electrode assembly 23 through the second electrode terminal 221; or, current flows into the electrode assembly 23 through the second electrode terminal 221 and flows out of the electrode assembly 23 through the first electrode terminal 22.

[0128] Exemplarily, the first electrode terminal 22 is electrically connected to the positive electrode of the electrode assembly 23, and the second electrode terminal 221 is electrically connected to the negative electrode of the electrode assembly 23; or, the second electrode terminal 221 is electrically connected to the positive electrode of the electrode assembly 23, and the first electrode terminal 22 is electrically connected to the negative electrode of the electrode assembly 23.

[0129] In some embodiments, the first electrode terminal 22 and the second electrode terminal 221 may both be cylindrical structures or polygonal prismatic structures. In some embodiments, the first electrode terminal 22 and the second electrode terminal 221 are made of a metallic material, for example, made of aluminum, copper, iron, aluminum, steel, alloy or composite metal.

[0130] In some embodiments, the first electrode terminal 22 and the second electrode terminal 221 may be mounted on the first wall 211 through an insulating structure.

[0131] It should be noted that the electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. The structure of the electrode assembly 23 can be various. Exemplarily, the electrode assembly 23 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. Exemplarily, the separator is a separator film, and 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.

[0132] In an embodiment where the electrode assembly 23 is a wound structure, the thickness direction X of the first wall may be parallel to the winding axis of the electrode assembly 23.

[0133] Exemplarily, the housing 21 may accommodate one electrode assembly 23 or may accommodate a plurality of electrode assemblies 23, and the plurality of electrode assemblies 23 are stacked along the second direction Z.

[0134] The liquid injection hole 211A is used for the electrolyte to enter the interior of the battery cell 20 from a liquid injection device. In an embodiment where the housing 21 has the liquid injection hole 211A, the battery cell 20 further includes a plugging member 211B for plugging the liquid injection hole 211A.

[0135] In some embodiments, the axes of the liquid injection hole 211A, the first electrode terminal 22, and the second electrode terminal 221 are pairwise parallel and lie in the same plane, so that after positioning the housing 21, the positioning of the liquid injection hole 211A can be completed, which facilitates the smooth progress of the electrolyte injection operation.

[0136] In an embodiment where the first electrode terminal 22 is closer to the liquid injection gun than the second electrode terminal 221, the liquid injection hole 211A is located on the side of the first electrode terminal 22 away from the second electrode terminal 221, so that the liquid injection gun is disposed relative to the liquid injection hole 211A between the first electrode terminal 22 and the second electrode terminal 221. During the process of injecting liquid into the battery cell 20 provided in the embodiments of the present application, the moving path is shorter, thereby reducing the time required for liquid injection, reducing the production time of the battery cell 20, and improving the production efficiency of the battery cell 20.

[0137] In the above technical solution, since the liquid injection hole 211A is provided on the side of the first electrode terminal 22 away from the second electrode terminal 221, on the one hand, other structural components (such as the pressure relief mechanism 211C and the adapter) arranged between the two electrode terminals do not need to be provided with an avoidance structure to avoid the liquid injection hole 211A, thereby improving the reliability of these structural components and thus improving the reliability of the battery cell 20; on the other hand, the area of the first wall 211 located between the two electrode terminals that needs to be drilled is reduced, thereby improving the reliability of the area of the first wall 211 located between the two electrode terminals and thus improving the reliability of the battery cell 20.

[0138] According to some embodiments of the present application, please continue to refer to Figure 3 , the electrode assembly 23 includes a main body 233, a first tab 231, and a second tab 232. The first tab 231 and the second tab 232 are both provided on the side of the main body 233 facing the first wall 211. The battery cell 20 further includes a first adapter 24 and a second adapter 25. The first adapter 24 is used to electrically connect the first tab 231 to the first electrode terminal 22. The second adapter 25 is used to electrically connect the second tab 232 to the second electrode terminal 221.

[0139] Among them, the main body 233 is the area where the electrode assembly 23 undergoes a chemical reaction in the battery cell 20. The main body 233 is a structure formed by winding a region where the positive electrode sheet is coated with a positive electrode active material layer, a separator, and a region where the negative electrode sheet is coated with a negative electrode active material layer, and mainly operates by the movement of metal ions between the positive electrode sheet and the negative electrode sheet with opposite polarities.

[0140] The first tab 231 and the second tab 232 are the parts of the electrode assembly 23 that are respectively used to guide current into and out of the main body 233. Exemplarily, the first tab 231 is used to guide current into the main body 233, and the second tab 232 is used to guide current out of the main body 233; or, the second tab 232 is used to guide current into the main body 233, and the first tab 231 is used to guide current out of the main body 233.

[0141] If the first tab 231 is used for inputting or outputting the positive electrode of the electrode assembly 23, the first tab 231 is a component formed by laminating and connecting regions on the positive electrode sheet where the positive electrode active material layer is not coated. Correspondingly, if the second tab 232 is used for outputting or inputting the negative electrode of the electrode assembly 23, the second tab 232 is a component formed by laminating and connecting regions on the negative electrode sheet where the negative electrode active material layer is not coated. If the first tab 231 is used for outputting or inputting the negative electrode of the electrode assembly 23, the first tab 231 is a component formed by laminating and connecting regions on the negative electrode sheet where the negative electrode active material layer is not coated. Correspondingly, if the second tab 232 is used for inputting or outputting the positive electrode of the electrode assembly 23, the second tab 232 is a component formed by laminating and connecting regions on the positive electrode sheet where the positive electrode active material layer is not coated. Exemplarily, in the embodiment of the present application, the first tab 231 is used for outputting or inputting the negative electrode of the electrode assembly 23, and the second tab 232 is used for outputting or inputting the positive electrode of the electrode assembly 23.

[0142] In an embodiment where the electrode assembly 23 is of a wound structure, the positive electrode sheet includes a plurality of positive sub-tabs where the positive electrode active material layer is not coated, and the plurality of positive sub-tabs form one of the first tab 231 and the second tab 232. The negative electrode sheet includes a plurality of negative sub-tabs where the negative electrode active material layer is not coated, and the plurality of negative sub-tabs form the other of the first tab 231 and the second tab 232.

[0143] The first adapter 24 is a component disposed between the first tab 231 and the first wall 211, and through the first adapter 24, the electrical connection between the first tab 231 and the first electrode terminal 22 can be achieved. The first adapter 24 is made of a conductive material. For example, the material of the first adapter 24 can be copper, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy, etc. The connection relationship between the first adapter 24 and the first tab 231 includes but is not limited to welding, bonding, clamping, or other connection relationships through other connection members. The connection relationship between the first adapter 24 and the first electrode terminal 22 includes but is not limited to welding, bonding, clamping, or other connection relationships through other connection members.

[0144] The second adapter 25 is a component disposed between the second tab 232 and the first wall 211, and through the second adapter 25, the electrical connection between the second tab 232 and the second electrode terminal 221 can be achieved. The second adapter 25 is made of a conductive material. For example, the material of the second adapter 25 can be copper, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy, etc. The connection relationship between the second adapter 25 and the second tab 232 includes but is not limited to welding, bonding, clamping, or other connection relationships through other connection members. The connection relationship between the second adapter 25 and the second electrode terminal 221 includes but is not limited to welding, bonding, clamping, or other connection relationships through other connection members.

[0145] In the above solution, by arranging both the first tab 231 and the second tab 232 of the electrode assembly 23 on the same side of the main body 233, and making the first adapter 24 and the second adapter 25 located on the same side of the electrode assembly 23, the distance between the main body 233 and the first wall 211 in the thickness direction X of the first wall is fully utilized by the first tab 231, the second tab 232, the first adapter 24, and the second adapter 25, thereby saving the space occupied by the first tab 231, the second tab 232, the first adapter 24, and the second adapter 25 in the thickness direction X of the first wall, so as to improve the energy density of the battery cell 20 having such an electrode assembly 23.

[0146] According to some embodiments of the present application, please continue to refer to Figure 3 and please continue to refer to Figure 4 , Figure 4 is a schematic structural view of the first wall 211 provided by some embodiments of the present application. Along the thickness direction X of the first wall, the projection of the first adapter 24 on the first wall 211 is the first projection 24A, and the projection of the second adapter 25 on the first wall 211 is the second projection 25A. Along the first direction Y, the liquid injection hole 211A is located on the side of the first projection 24A away from the second projection 25A.

[0147] The first projection 24A is the orthographic projection of the first adapter 24 on the first wall 211 along the thickness direction X of the first wall; the second projection 25A is the orthographic projection of the second adapter 25 on the first wall 211 along the thickness direction X of the first wall.

[0148] For the convenience of the ranges of the first projection 24A and the second projection 25A, please refer to Figure 4 , in the figure, the ranges where the first projection 24A and the second projection 25A are located are marked in the form of dotted lines or pattern filling. It should be noted that the dotted lines and pattern filling are only for the convenience of showing the ranges of the first projection 24A and the second projection 25A, and do not represent any physical meaning.

[0149] "Along the first direction Y, the liquid injection hole 211A is located on the side of the first projection 24A away from the second projection 25A" can be understood as that along the first direction Y, the liquid injection hole 211A, the first projection 24A, and the second projection 25A are arranged in sequence.

[0150] In the above solution, the liquid injection hole 211A is located on the side of the first projection 24A away from the second projection 25A, so that the part of the first adapter 24 close to the second adapter 25 and the second adapter 25 do not need to be provided with an avoidance structure to avoid the liquid injection hole 211A, thereby improving the reliability of the part of the first adapter 24 close to the second adapter 25 and the second adapter 25, and thus improving the reliability of the battery cell 20.

[0151] According to some embodiments of the present application, please continue to refer to Figure 4 , and please further refer to Figure 5 . Figure 5 FIG. 7 is a schematic structural diagram of the first adapter 24 or the second adapter 25 provided in some embodiments of the present application. Along the second direction Z, the liquid injection hole 211A does not overlap with the first projection 24A, and the liquid injection hole 211A does not overlap with the second projection 25A. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other in pairs.

[0152] "Along the second direction Z, the liquid injection hole 211A does not overlap with the first projection 24A" can be understood as that the straight lines extending along the second direction Z intersecting the liquid injection hole 211A do not intersect with the first projection 24A.

[0153] "Along the second direction Z, the liquid injection hole 211A does not overlap with the second projection 25A" can be understood as that the straight lines extending along the second direction Z intersecting the liquid injection hole 211A do not intersect with the first projection 24A.

[0154] In some embodiments, referring to Figure 5 , the first adapter 24 includes a first main body portion 241 and a first protrusion 242. The first protrusion 242 protrudes from the side surface of the first main body portion 241 facing the first wall 211. The first protrusion 242 includes a first end wall 242A and a first peripheral wall 242B. The first peripheral wall 242B surrounds the first end wall 242A. The first peripheral wall 242B connects the first end wall 242A and the first main body portion 241. The first end wall 242A is connected to a first electrode terminal (not shown in the figure). Along the second direction Z, the liquid injection hole 211A does not overlap with the first projection 24A, so that the first main body portion 241 does not need to be provided with an avoidance groove for avoiding the liquid injection hole 211A. Furthermore, the cross-section of the first main body portion 241 in the first direction Y will not be reduced due to the avoidance structure, so that the current-carrying area of the first adapter 24 will not be reduced due to the avoidance structure, thereby increasing the current-carrying capacity of the first adapter 24.

[0155] In some embodiments, referring to Figure 5, the second adapter 25 includes a second main body portion 251 and a second protrusion 252. The second protrusion 252 protrudes from the side of the second main body portion 251 facing the first wall (not shown in the figure). The second protrusion 252 includes a second end wall 252A and a second peripheral wall 252B. The second peripheral wall 252B surrounds the second end wall 252A. The second peripheral wall 252B connects the second end wall 252A and the second main body portion 251. The second end wall 252A is connected to the second electrode terminal (not shown in the figure). Along the second direction Z, the liquid injection hole 211A does not overlap with the second projection 25A, so that the second main body portion 251 does not need to be provided with an avoidance groove for avoiding the liquid injection hole 211A. Furthermore, the cross-section of the second main body portion 251 in the first direction Y will not be reduced due to the avoidance structure, so that the current-carrying area of the second adapter 25 will not be reduced due to the avoidance structure, thereby increasing the current-carrying capacity of the second adapter 25.

[0156] In the above solution, along the second direction Z, the liquid injection hole 211A does not overlap with the first projection 24A, and the liquid injection hole 211A does not overlap with the second projection 25A. Thus, neither the first adapter 24 nor the second adapter 25 needs to be provided with an avoidance structure to avoid the liquid injection hole 211A. On the one hand, the part of the first adapter 24 connected to the first tab 231 does not need to be provided with an avoidance structure to avoid the liquid injection hole 211A. Furthermore, the cross-sectional area of the part of the first adapter 24 for passing current does not need to be reduced due to avoiding the liquid injection hole 211A, thereby improving the current-carrying capacity of the first adapter 24; on the other hand, the part of the second adapter 25 connected to the second tab 232 does not need to be provided with an avoidance structure to avoid the liquid injection hole 211A. Furthermore, the cross-sectional area of the part of the second adapter 25 for passing current does not need to be reduced due to avoiding the liquid injection hole 211A, thereby improving the current-carrying capacity of the second adapter 25.

[0157] According to some embodiments of the present application, please refer to Figure 6 , Figure 6 is a three-dimensional exploded view of another battery 100 provided by some embodiments of the present application. The battery cell 20 further includes a first insulating member 26. Along the thickness direction X of the first wall, the first insulating member 26 is located between the first wall 211 and the electrode assembly 23. The first insulating member 26 is provided with a first cavity 261. The first cavity 261 is used to communicate the liquid injection hole 211A and the space on the side of the first insulating member 26 away from the first wall 211.

[0158] The first insulating member 26 is disposed between the electrode assembly 23 and the first wall 211. The first insulating member 26 has an insulating property and can insulate and isolate the first wall 211 from the first adapter 24 and the second adapter 25, and can also insulate and isolate the first wall 211 from the electrode assembly 23.

[0159] In some embodiments, the first insulating member 26 can be in the shape of a sheet, a plate or a ring, etc.

[0160] In some embodiments, the first insulating member 26 may be a rubber member, a silicone member, or a plastic member.

[0161] In some embodiments, the first insulating member 26 is made of insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0162] The first insulating member 26 may be the lower plastic of the battery cell 20 .

[0163] The connection relationship between the first insulating member 26 and the first wall 211 includes, but is not limited to, one-piece injection molding, bonding, clamping, or connection via other connecting components.

[0164] The first cavity 261 is a cavity in the first insulating member 26 for connecting the injection hole 211A and the space on the side of the first insulating member 26 away from the first wall 211. The electrolyte passes through the injection hole 211A and the first cavity 261 in sequence to enter the space on the side of the first insulating member 26 away from the first wall 211 to infiltrate the electrode assembly 23.

[0165] In the above scheme, a first cavity 261 is provided in the first insulating member 26, connecting the injection hole 211A and the space on the side of the first insulating member 26 away from the first wall 211. When the electrolyte is injected into the outer shell 21, the electrolyte enters the first cavity 261 through the injection hole 211A, and enters the space on the side of the first insulating member 26 away from the first wall 211 after being buffered by the first cavity 261, thereby reducing the flow rate of the electrolyte, thereby reducing the risk of damaging the electrode assembly 23 due to excessively fast electrolyte flow rate.

[0166] According to some embodiments of this application, please refer to Figure 6 , and please refer to Figure 7 , Figure 7 The first insulating member 26 is a three-dimensional exploded view provided in some embodiments of the present application. The first insulating member 26 includes a first base 26A, a first convex portion 26B and a second convex portion 26C. Along the first direction Y, the first convex portion 26B and the second convex portion 26C are respectively arranged at both ends of the first base 26A, the first convex portion 26B and the second convex portion 26C protrude from the side of the first base 26A facing the electrode assembly 23, and the first cavity 261 is arranged in the first convex portion 26B.

[0167] A first protrusion 26B is provided on the side of the first substrate 26A facing the electrode assembly 23, and the first protrusion 26B is the portion of the first insulating member 26 used for abutting the electrode assembly 23; a second protrusion 26C is provided on the side of the first substrate 26A facing the electrode assembly 23, and the second protrusion 26C is the portion of the first insulating member 26 used for abutting the electrode assembly 23.

[0168] The shape of the first convex portion 26B can be various. Exemplarily, in Figure 6 the first convex portion 26B is in the shape of a cuboid. The shape of the second convex portion 26C can also be various. Exemplarily, in Figure 6 the second convex portion 26C is in the shape of a cuboid.

[0169] The connection relationship between the first convex portion 26B and the first base body 26A includes but is not limited to integrally molding by injection, bonding, snap - fitting, or connecting through other connecting members, etc.; the connection relationship between the second convex portion 26C and the first base body 26A includes but is not limited to integrally molding by injection, bonding, snap - fitting, or connecting through other connecting members, etc.

[0170] In some embodiments, the first convex portion 26B is used to abut against the part of the main body 233 on the side of the first tab 231 away from the second tab 232, and the second convex portion 26C is used to abut against the part of the main body 233 on the side of the second tab 232 away from the first tab 231. Thus, both the first convex portion 26B and the second convex portion 26C are in contact with the main body 233, thereby reducing the risk of internal short - circuit of the battery cell 20 caused by the first adapter 24 and the second adapter 25 abutting against the main body 233 due to abutting against the first insulating member 26.

[0171] In the above solution, by respectively arranging the first convex portion 26B and the second convex portion 26C protruding towards the electrode assembly 23 in the X - direction along the thickness of the first wall at the opposite ends of the first base body 26A in the first direction Y, when the electrode assembly 23 approaches the first wall 211 in the X - direction along the thickness of the first wall, the first convex portion 26B and the second convex portion 26C are in contact with the electrode assembly 23 to limit the excessive movement of the electrode assembly 23 in the X - direction along the thickness of the first wall. Furthermore, it reduces the risk of internal open - circuit of the battery cell 20 caused by the connection break between the tab and the adapter due to the excessive movement of the electrode assembly 23 in the X - direction along the thickness of the first wall, and improves the reliability of the battery cell 20.

[0172] According to some embodiments of the present application, please refer to Figure 6 and Figure 7 , and please further refer to Figure 8 and Figure 9 . Figure 8 is Figure 7 the enlarged view of part A in Figure 9 is the structural schematic diagram of the first insulating member 26 provided by some embodiments of the present application. A first through - hole 262 corresponding to the position of the liquid injection hole 211A is provided on the side of the first insulating member 26 facing the first wall 211, and the first through - hole 262 communicates with the first cavity 261. The first insulating member 26 further includes a shielding portion 263. The shielding portion 263 is arranged in the first cavity 261, and at least partially shields the first through - hole 262 in the X - direction along the thickness of the first wall.

[0173] On one side of the first insulating member 26 facing the first wall 211, there is a first through hole 262 for communicating the liquid injection hole 211A and the first cavity 261.

[0174] In some embodiments, the first through hole 262 penetrates through one side of the first cavity 261 close to the first wall 211 along the thickness direction X of the first wall.

[0175] The cross-section of the first through hole 262 can be of various shapes. Exemplarily, the cross-section of the first through hole 262 can be circular, or can be equal to the cross-section of the first cavity 261.

[0176] In some embodiments, on one side of the first insulating member 26 facing the first wall 211, there is also a first auxiliary hole 262A for communicating the liquid injection hole 211A and the first cavity 261. The first auxiliary hole 262A is arranged around the outer periphery of the first through hole 262, and the cross-sectional area of the first auxiliary hole 262A is smaller than that of the first through hole 262. Exemplarily, referring to Figure 9 ..., the first auxiliary holes 262A are two respectively located on opposite sides of the first through hole 262 in the second direction Z.

[0177] In the first cavity 261, there is a shielding portion 263 for shielding the first through hole 262, so that the electrolyte entering the first cavity 261 from the first through hole 262 needs to bounce off the shielding portion 263 before entering the first cavity 261.

[0178] The connection relationship between the shielding portion 263 and the wall portion of the first cavity 261 includes but is not limited to integrally formed by injection molding, bonding, snap connection, or connection through other connecting members, etc.

[0179] In some embodiments, a part of the shielding portion 263 can be directly arranged in the first through hole 262 to block part of the first through hole 262.

[0180] In some embodiments, referring to Figure 9 ..., the shielding portion 263 includes a third end wall 263A and third peripheral walls 263B. The third peripheral walls 263B are two respectively arranged at both ends of the third end wall 263A in the first direction Y. The two third peripheral walls 263B respectively protrude from the side of the third end wall 263A facing the first wall (not shown in the figure) and are connected to one side of the first cavity 261 close to the first wall (not shown in the figure). So that along the thickness direction X of the first wall, the third end wall 263A shields the first through hole 262.

[0181] In the above scheme, a shielding portion 263 is provided in the first cavity 261, and the shielding portion 263 shields the first through hole 262 in the thickness direction X of the first wall. When the electrolyte enters the first cavity 261 through the first through hole 262 along the thickness direction X of the first wall, the electrolyte will contact the shielding portion 263, so that the shielding portion 263 hinders the flow of the electrolyte, thereby reducing the fluidity of the electrolyte, thereby reducing the risk of damaging the electrode assembly 23 due to excessive electrolyte flow rate, thereby improving the reliability of the battery cell 20.

[0182] According to some embodiments of this application, please refer to Figure 6 and Figure 7 , and please refer to Figure 8 and Figure 9 The first convex portion 26B has a first surface 264 facing the second convex portion 26C along the first direction Y, and the first surface 264 defines a first opening 264A communicating with the first cavity 261 .

[0183] The first protrusion 26B has a first surface 264 facing the second protrusion 26C along the first direction Y.

[0184] In the embodiment where the first protrusion 26B is cylindrical, the first surface 264 may be a peripheral side of the first protrusion 26B along the first direction Y close to the second protrusion 26C.

[0185] In the embodiment where the first protrusion 26B is in a rectangular parallelepiped shape, the first surface 264 may be a plane of the first protrusion 26B along the first direction Y close to the second protrusion 26C.

[0186] The first surface 264 defines a first opening 264A communicating with the first cavity 261 and a space on a side of the first insulating member 26 away from the first wall 211 .

[0187] The first opening 264A may be in various shapes matching the first cavity 261 .

[0188] In some embodiments, the battery cell 20 further includes an insulating film wrapped around the periphery of the electrode assembly 23 to isolate the electrode assembly 23 from the inner wall of the housing 21. The insulating film can seal, protect and insulate the electrode assembly 23. For example, the insulating film can be a Mylar film. The side of the insulating film close to the first wall 211 can be connected to the first insulating member 26 by hot melting. The first opening 264A is arranged on the first surface 264 of the first protrusion 26B facing the second protrusion 26C to increase the area where the first protrusion 242 is connected to the insulating film. Thereby, the connection strength between the insulating film and the first insulating member 26 is improved.

[0189] In the above solution, since the first convex portion 26B is provided with a first opening 264A communicating with the first cavity 261 on the first surface 264 facing the second convex portion 26C along the first direction Y, when the electrolyte enters the space on the side of the first insulating member 26 away from the first wall 211 from the first cavity 261, the electrolyte in the first cavity 261 can enter the space on the side of the first insulating member 26 away from the first wall 211 through the first opening 264A, reducing the risk of the electrolyte remaining in the first cavity 261 and improving the wetting degree of the electrolyte on the electrode assembly 23, which is beneficial to improving the service life of the battery cell 20.

[0190] According to some embodiments of the present application, please refer to Figure 6 and please further refer to Figure 10 , Figure 10 FIG. is a schematic structural view of another first insulating member 26 provided in some embodiments of the present application. The first convex portion 26B has a second surface 265 in contact with the main body 233, and a plurality of second through holes 265B communicating with the first cavity 261 are provided on the second surface 265, and the plurality of second through holes 265B are arranged in an array.

[0191] The first convex portion 26B has a second surface 265 facing the electrode assembly 23 along the thickness direction X of the first wall, and the second surface 265 is used for contacting the electrode assembly 23.

[0192] In some implementations, the second surface 265 may be a flat surface to facilitate surface contact with the electrode assembly 23. Thereby reducing the pressure received when the electrode assembly 23 contacts the first insulating member 26, and further reducing the risk of damage to the electrode assembly 23 caused by contacting the first insulating member 26.

[0193] Second through holes 265B communicating the first cavity 261 and the space on the side of the first insulating member 26 away from the first wall 211 are provided on the second surface 265.

[0194] The cross-section of the second through hole 265B can be various. Exemplarily, the cross-section of the second through hole 265B can be circular or square.

[0195] The plurality of second through holes 265B may be arranged in a rectangular array; or, the plurality of second through holes 265B may also be arranged in an annular array.

[0196] In the embodiment where the plurality of second through holes 265B may be arranged in a rectangular array, the plurality of second through holes 265B are arranged in a rectangular array, which may be that the distance between any two adjacent second through holes 265B is the same, or, alternatively, the distance between two adjacent second through holes 265B in each column is different from the distance between two adjacent second through holes 265B in each row.

[0197] In an embodiment where a plurality of second through-holes 265B are arranged in an annular array, the plurality of second through-holes 265B are arranged at intervals around the axis of the first through-hole 262.

[0198] In the above solution, since a plurality of second through-holes 265B arranged in an array are provided on the second surface 265 that abuts against the main body 233, when the electrolyte enters the space on the side of the first insulating member 26 away from the first wall 211 from the first cavity 261, the electrolyte will contact the wall portion of the first cavity 261 where the second through-holes 265B are not provided, thereby causing the wall portion of the first cavity 261 where the second through-holes 265B are not provided to impede the flow of the electrolyte, thereby reducing the fluidity of the electrolyte, and thus reducing the risk of damaging the electrode assembly 23 due to the too-fast flow rate of the electrolyte, thereby improving the reliability of the battery cell 20.

[0199] According to some embodiments of the present application, please refer to Figure 6 and Figure 7 , and please further refer to Figure 8 and Figure 9 , the first convex portion 26B has a second surface 265 that abuts against the main body 233, and a second opening 265A communicating with the first cavity 261 is provided on the second surface 265.

[0200] A second opening 265A communicating with the first cavity 261 and the space on the side of the first insulating member 26 away from the first wall 211 is provided on the second surface 265.

[0201] The second opening 265A can be various shapes adapted to the first cavity 261.

[0202] In an embodiment where the first surface 264 has a first opening 264A, referring to Figure 9 , the edge of the second opening 265A close to the second convex portion 26C in the first direction Y can extend towards the first opening 264A and communicate with the first opening 264A.

[0203] In the above solution, since the second opening 265A is provided on the second surface 265 that abuts against the main body 233, when the electrolyte enters the space on the side of the first insulating member 26 away from the first wall 211 from the first cavity 261, the electrolyte in the first cavity 261 can directly enter the space on the side of the first insulating member 26 away from the first wall 211 through the second opening 265A, thereby reducing the time for the electrolyte to enter the space on the side of the first insulating member 26 away from the first wall 211 through the first cavity 261, thereby increasing the injection speed, and thus increasing the production efficiency of the battery cell 20.

[0204] According to some embodiments of the present application, please refer to Figure 6 and Figure 7 , and please further refer to Figure 8 andFigure 9 Moreover, the first insulating member 26 further includes a third convex portion 26D protruding from a side of the first base body 26A facing the electrode assembly 23. Along the first direction Y, the third convex portion 26D is located between the first convex portion 26B and the second convex portion 26C. At least a part of the first adapter 24 is located between the first convex portion 26B and the third convex portion 26D, and at least a part of the second adapter 25 is located between the second convex portion 26C and the third convex portion 26D.

[0205] A third convex portion 26D is provided on a side of the first base body 26A facing the electrode assembly 23, and the third convex portion 26D is a portion of the first insulating member 26 for abutting against the electrode assembly 23.

[0206] The shape of the third convex portion 26D can be various. Exemplarily, in Figure 6 , the third convex portion 26D is in the shape of a cuboid.

[0207] The connection relationship between the third convex portion 26D and the first base body 26A includes, but is not limited to, integrally molding by injection, bonding, snap connection, or connection through other connecting members, etc.

[0208] In some embodiments, the third convex portion 26D is used to abut against a portion of the main body 233 located between the first tab 231 and the second tab 232. Thereby, the middle part of the first insulating member 26 can be supported by the electrode assembly 23. And the first adapter 24, the first tab 231, the second adapter 25, and the second tab 232 are insulated from each other, thereby reducing the risk of internal short circuit of the battery cell 20 caused by the overlap of the first adapter 24 and the second adapter 25, and improving the reliability of the battery 100.

[0209] In the above solution, since the third convex portion 26D is provided between the first convex portion 26B and the second convex portion 26C in the first direction Y, and at least a part of the first adapter 24 is located between the first convex portion 26B and the third convex portion 26D, and at least a part of the second adapter 25 is located between the second convex portion 26C and the third convex portion 26D, the third convex portion 26D can restrict the movement of the first adapter 24 and the second adapter 25 in the first direction Y, thereby reducing the risk of internal short circuit of the battery cell 20 caused by the overlap of the first adapter 24 and the second adapter 25, and improving the reliability of the battery 100.

[0210] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , Figure 11 is a three-dimensional exploded view of the housing 21 provided by some embodiments of the present application. Figure 12Another exploded perspective view of the housing 21 provided by some embodiments of the present application. The housing 21 includes a housing body 212 and a cover plate 213. The housing body 212 has an opening, and the cover plate 213 seals the opening. The first wall 211 is the cover plate 213, or the first wall 211 is the wall portion of the housing body 212 opposite to the cover plate 213.

[0211] The housing body 212 is a component for accommodating the electrode assembly 23.

[0212] The cover plate 213 is a component that covers the opening of the housing body 212 to isolate the internal environment of the battery cell 20 from the external environment.

[0213] It can be understood that the shape of the cover plate 213 can be adapted to the shape of the housing body 212. For example, the housing body 212 has a cuboid structure, and the cover plate 213 has a rectangular plate-like structure adapted to the housing body 212. The material of the cover plate 213 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 213 can be the same as or different from the material of the housing body 212.

[0214] It can be understood that with reference to Figure 11 , the first wall 211 can be the cover plate 213; or, with reference to Figure 12 , the first wall 211 can also be the wall portion of the housing body 212 opposite to the cover plate 213. The embodiments of the present application do not make any limitations.

[0215] In the above technical solution, the design of the opening facilitates accommodating the electrode assembly 23 into the housing body 212 through the opening, and the cover plate 213 seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly 23 and improving the reliability of the battery cell 20.

[0216] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 includes the battery cell 20 provided above.

[0217] Among them, as shown in Figure 2 , the battery 100 may further include a box body 10, and the battery cell 20 is accommodated in the box body 10.

[0218] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.

[0219] Optionally, the second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0220] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in Figure 2 the box body 10 is a cuboid structure.

[0221] Optionally, the battery cells 20 disposed in the box body 10 may be one or multiple. Exemplarily, in Figure 2 the box body 10 of the battery 100 is provided with multiple battery cells 20. The multiple battery cells 20 may be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10.

[0222] Among them, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component that connects the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0223] It should be noted that in some embodiments, the battery 100 may not be provided with the box body 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of the multiple battery cells 20 can be directly assembled to the electrical device to provide electrical energy for the electrical device through the multiple battery cells 20. That is to say, the box body 10 can be a part of the electrical device. Taking the electrical device as the vehicle 1000 as an example, the box body 10 can be a part of the chassis structure of the vehicle 1000. For example, a part of the box body 10 can become at least a part of the floor of the vehicle 1000, or a part of the box body 10 can become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0224] According to some embodiments of the present application, some embodiments of the present application further provide an electrical device. The electrical device includes the battery cell 20 provided above, and the battery cell 20 is used to provide electrical energy.

[0225] According to some embodiments of the present application, a battery cell 20 is provided. Please refer to Figures 3 - 12 . The battery cell 20 includes a housing 21, a first electrode terminal 22, a second electrode terminal 221, a first insulating member 26, and an electrode assembly 23.

[0226] The housing 21 includes a first wall 211. The housing 21 includes a housing body 212 and a cover plate 213. The housing body 212 has an opening, and the cover plate 213 seals the opening. Among them, referring to Figure 11 , the first wall 211 can be the cover plate 213; or, referring to Figure 12 , the first wall 211 can also be the wall portion of the housing body 212 opposite to the cover plate 213.

[0227] The thickness direction X of the first wall is parallel to the height direction of the battery cell 20, the first direction Y is parallel to the length direction of the battery cell 20, and the second direction Z is parallel to the width direction of the battery cell 20.

[0228] The first electrode terminal 22 and the second electrode terminal 221 are arranged on the first wall 211 at intervals along the first direction Y. The electrode assembly 23 is accommodated in the housing 21. The electrode assembly 23 includes a main body 233, a first tab 231, and a second tab 232. Both the first tab 231 and the second tab 232 are arranged on the side of the main body 233 facing the first wall 211. The battery cell 20 further includes a first adapter 24 and a second adapter 25. The first adapter 24 is used for electrically connecting the first tab 231 and the first electrode terminal 22. The second adapter 25 is used for electrically connecting the second tab 232 and the second electrode terminal 221.

[0229] Among them, the first wall 211 is provided with a liquid injection hole 211A for injecting electrolyte into the housing 21. Along the first direction Y, the liquid injection hole 211A is located on the side of the first electrode terminal 22 away from the second electrode terminal 221.

[0230] Along the thickness direction X of the first wall, the projection of the first adapter 24 on the first wall 211 is a first projection 24A, and the projection of the second adapter 25 on the first wall 211 is a second projection 25A. Along the first direction Y, the liquid injection hole 211A is located on the side of the first projection 24A away from the second projection 25A. And along the second direction Z, the liquid injection hole 211A does not overlap with the first projection 24A, and the liquid injection hole 211A does not overlap with the second projection 25A.

[0231] Furthermore, the structural interference between the first adapter 24 and the second adapter 25 and the liquid injection hole 211A along the second direction Z is reduced. Furthermore, it is not necessary to provide an avoidance structure for avoiding the liquid injection hole 211A on the first adapter 24 and the second adapter 25. Furthermore, the current-carrying area of the first adapter 24 and the second adapter 25 will not be reduced due to the avoidance structure, thereby increasing the current-carrying capacity of the first adapter 24 and the second adapter 25.

[0232] The first insulating member 26 includes a first base 26A, a first convex portion 26B, a second convex portion 26C, and a third convex portion 26D.

[0233] Along the first direction Y, the first convex portion 26B and the second convex portion 26C are respectively disposed at two ends of the first base body 26A, and the first convex portion 26B and the second convex portion 26C protrude from the side of the first base body 26A facing the electrode assembly 23. The third convex portion 26D protrudes from the side of the first base body 26A facing the electrode assembly 23. Along the first direction Y, the third convex portion 26D is located between the first convex portion 26B and the second convex portion 26C. At least part of the first adapter 24 is located between the first convex portion 26B and the third convex portion 26D, and at least part of the second adapter 25 is located between the second convex portion 26C and the third convex portion 26D.

[0234] The first convex portion 26B is used to abut against the part of the main body 233 on the side where the first tab 231 is away from the second tab 232, and the second convex portion 26C is used to abut against the part of the main body 233 on the side where the second tab 232 is away from the first tab 231. Thus, both the first convex portion 26B and the second convex portion 26C are in contact with the main body 233, thereby reducing the internal short circuit of the battery cell 20 caused by the contact of the first adapter 24 and the second adapter 25 with the main body 233 due to the contact with the first insulating member 26.

[0235] The third convex portion 26D is used to abut against the part of the main body 233 between the first tab 231 and the second tab 232. Thus, the middle part of the first insulating member 26 can be supported by the electrode assembly 23. And the first adapter 24, the first tab 231 and the second adapter 25, the second tab 232 are isolated, thereby reducing the risk of internal short circuit of the battery cell 20 caused by the overlap of the first adapter 24 and the second adapter 25, and improving the reliability of the battery 100.

[0236] The first insulating member 26 is provided with a first cavity 261, and the first cavity 261 is used to communicate the liquid injection hole 211A and the space on the side of the first insulating member 26 away from the first wall 211.

[0237] The first cavity 261 is disposed in the first convex portion 26B, and a first through hole 262 for communicating the liquid injection hole 211A and the first cavity 261 is provided on the side of the first insulating member 26 facing the first wall 211.

[0238] A shielding portion 263 is disposed in the first cavity 261. Refer to Figure 9 , the shielding portion 263 includes a third end wall 263A and a third peripheral wall 263B. The third peripheral wall 263B are two respectively disposed at two ends of the third end wall 263A in the first direction Y. The two third peripheral walls 263B respectively protrude from the side of the third end wall 263A facing the first wall 211 and are connected to the side of the first cavity 261 close to the first wall 211. So that along the thickness direction X of the first wall, the third end wall 263A shields the first through hole 262.

[0239] Therefore, by providing a shielding portion 263 within the first cavity 261 and causing the shielding portion 263 to shield the first through-hole 262 in the thickness direction X of the first wall, the shielding portion 263 can buffer the electrolyte entering the first cavity 261 from the first through-hole 262, thereby reducing the flow rate of the electrolyte, and further reducing the risk of wrinkling of the separator in the electrode assembly 23 due to the too-fast flow rate of the electrolyte, resulting in an internal short circuit in the electrode assembly 23.

[0240] The first convex portion 26B has a first surface 264 facing the second convex portion 26C along the first direction Y, and a first opening 264A communicating with the first cavity 261 is formed in the first surface 264.

[0241] Thus, the electrolyte in the first cavity 261 can enter the space on the side of the first insulating member 26 away from the first wall 211 through the first opening 264A, reducing the risk of the electrolyte remaining in the first cavity 261 and improving the wetting degree of the electrolyte on the electrode assembly 23, which is beneficial to improving the service life of the battery cell 20.

[0242] The first convex portion 26B has a second surface 265 that abuts against the main body 233.

[0243] In some embodiments, a plurality of second through-holes 265B communicating with the first cavity 261 are formed in the second surface 265, and the plurality of second through-holes 265B are arranged in an array.

[0244] In other embodiments, a second opening 265A communicating with the first cavity 261 is formed in the second surface 265.

[0245] In the above technical solution, by disposing the liquid injection hole 211A on the side of the first electrode terminal 22 away from the second electrode terminal 221, the number of avoidance structures required for other mechanisms between the two electrode terminals is reduced, and thus the assembly of the battery cell 20 is made more simple, thereby improving the production qualification rate of the battery cell 20.

[0246] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0247] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing including a first wall; a first electrode terminal and a second electrode terminal, wherein the first electrode terminal and the second electrode terminal are spaced apart and arranged on the first wall along a first direction; an electrode assembly, contained in the housing; The first wall is provided with an injection hole for injecting electrolyte into the shell, and along the first direction, the injection hole is located on a side of the first electrode terminal away from the second electrode terminal.

2. The battery cell according to claim 1, characterized in that: The electrode assembly comprises a main body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab are both arranged on a side of the main body facing the first wall; The battery cell further comprises: A first adapter, used for electrically connecting the first electrode tab and the first electrode terminal; The second adapter is used to electrically connect the second electrode tab and the second electrode terminal.

3. The battery cell according to claim 2, characterized in that: Along the thickness direction of the first wall, the projection of the first adapter on the first wall is a first projection, and the projection of the second adapter on the first wall is a second projection; Along the first direction, the injection hole is located on a side of the first projection away from the second projection.

4. The battery cell according to claim 3, characterized in that: Along the second direction, the injection hole does not overlap with the first projection, and the injection hole does not overlap with the second projection. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

5. The battery cell according to claim 2, characterized in that: The battery cell further includes a first insulating member, and along a thickness direction of the first wall, the first insulating member is located between the first wall and the electrode assembly; The first insulating member is provided with a first cavity, and the first cavity is used to connect the liquid injection hole and a space on a side of the first insulating member away from the first wall.

6. The battery cell according to claim 5, characterized in that: The first insulating member includes a first substrate, a first protrusion and a second protrusion. Along the first direction, the first protrusion and the second protrusion are respectively arranged at two ends of the first substrate, the first protrusion and the second protrusion protrude from a side of the first substrate facing the electrode assembly, and the first cavity is arranged at the first protrusion.

7. The battery cell according to claim 6, characterized in that: A first through hole corresponding to the position of the liquid injection hole is provided on a side of the first insulating member facing the first wall, and the first through hole is connected to the first cavity; The first insulating member further includes a shielding portion, which is disposed in the first cavity and at least partially shields the first through hole along a thickness direction of the first wall.

8. The battery cell according to claim 6, characterized in that: The first convex portion has a first surface facing the second convex portion along the first direction, and the first surface is provided with a first opening communicating with the first cavity.

9. The battery cell according to claim 6, characterized in that: The first convex portion has a second surface abutting against the main body, and the second surface is provided with a plurality of second through holes communicating with the first cavity, and the plurality of second through holes are arranged in an array.

10. The battery cell according to claim 6, characterized in that: The first convex portion has a second surface abutting against the main body, and the second surface is provided with a second opening communicating with the first cavity.

11. The battery cell according to claim 6, characterized in that: The first insulating member further includes a third protrusion, the third protrusion protruding from a side of the first substrate facing the electrode assembly, and along the first direction, the third protrusion is located between the first protrusion and the second protrusion; At least a portion of the first transition member is located between the first protrusion and the third protrusion, and at least a portion of the second transition member is located between the second protrusion and the third protrusion.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The housing comprises a shell and a cover plate, the shell has an opening, and the cover plate covers the opening; The first wall is the cover plate, or the first wall is a wall portion of the housing opposite to the cover plate.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising a battery as claimed in claim 13, the battery is used to provide electrical energy.

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