Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment. The battery cell includes a housing, an electrode assembly, and an electrode terminal. The housing has a first wall portion and a second wall portion disposed opposite to each other in a first direction. The electrode assembly is housed within the housing. The electrode terminal is provided on the first wall portion, and the electrode terminal is electrically connected to the electrode assembly. Wherein in the first direction, the first wall part is provided with a first surface, the first surface is the surface, farthest from the second wall part, of the first wall part, and the electrode terminal does not protrude out of the first surface in the direction, pointing to the first wall part, of the second wall part. The electrode terminal is arranged on the first wall part, and the electrode terminal does not protrude out of the first surface of the first wall part along the direction from the second wall part to the first wall part, so that the risk that an external component interferes with the electrode terminal can be reduced, and the risk that the electrode terminal is damaged due to contact with the external component is reduced; and the service life of the battery monomer is prolonged.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have witnessed a leapfrog development. In the field of electric vehicles, the power battery, as the power source of the electric vehicle, plays an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing day by day. As the demand for batteries grows, higher requirements are put forward for the service life of battery cells. Therefore, how to extend the service life of battery cells is an urgent problem to be solved in battery technology. Summary of the Utility Model

[0003] Embodiments of the present application provide a battery cell, a battery and an electrical device to extend the service life of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a housing, an electrode assembly and an electrode terminal; the housing has a first wall portion and a second wall portion oppositely arranged along a first direction; the electrode assembly is accommodated in the housing; the electrode terminal is arranged on the first wall portion, and the electrode terminal is electrically connected to the electrode assembly; wherein, along the first direction, the first wall portion has a first surface, and the first surface is the surface of the first wall portion that is farthest from the second wall portion, and the electrode terminal does not protrude beyond the first surface along the direction from the second wall portion to the first wall portion.

[0005] In the above technical solution, by arranging the electrode terminal on the first wall portion and the electrode terminal not protruding beyond the first surface of the first wall portion along the direction from the second wall portion to the first wall portion, the risk of interference between the external component and the electrode terminal can be reduced, thereby reducing the risk of damage to the electrode terminal due to contact with the external component and extending the service life of the battery cell.

[0006] In some embodiments, the first wall portion includes a wall main body, a connecting portion and a sinking portion, the connecting portion connects the wall main body and the sinking portion, along the first direction, the sinking portion is closer to the second wall portion than the wall main body, and the electrode terminal is arranged on the sinking portion. By providing the sinking portion and arranging the electrode terminal on the sinking portion, the electrode terminal can be exposed on the outer surface of the first wall portion for easy electrical connection with an external connector of the electrode terminal, and it can also be ensured that the electrode terminal does not protrude beyond the first surface along the direction from the second wall portion to the first wall portion, reducing the risk of interference between the external component and the electrode terminal.

[0007] In some embodiments, the electrode assembly includes a first tab and a second tab with opposite polarities. The electrode terminal is insulated and connected to the sinking portion. The electrode terminal is electrically connected to the first tab, and the sinking portion is electrically connected to the second tab. By electrically connecting the first tab through the electrode terminal and the second tab through the sinking portion, the processing difficulty of the battery cell can be reduced, and the processing cost can be saved.

[0008] In some embodiments, the electrode assembly includes a first tab and a second tab with opposite polarities. Two electrode terminals are provided in the sinking portion, and the two electrode terminals are respectively electrically connected to the first tab and the second tab. By providing two electrode terminals and electrically connecting them to the first tab and the second tab respectively, both of the two electrode terminals can protrude from the sinking portion, making it more convenient for an external connector to be electrically connected to the electrode terminals.

[0009] In some embodiments, the first tab and the second tab are formed at the same end of the electrode assembly. By forming the first tab and the second tab at the same end of the electrode assembly, the occupied space of the electrode assembly in the housing can be reduced, and the energy density of the battery cell can be increased.

[0010] In some embodiments, the battery cell includes two electrode terminals, and the electrode assembly includes a first tab and a second tab with opposite polarities; the first wall portion includes two sinking portions, each sinking portion is connected to the wall body through a connecting portion, the two sinking portions are spaced apart, the two electrode terminals are respectively arranged in the two sinking portions, and are respectively electrically connected to the first tab and the second tab. By providing two sinking portions and respectively arranging the two electrode terminals in the two sinking portions, both of the two electrode terminals can protrude from the first wall portion without protruding from the first surface, making the arrangement of the electrode terminals more convenient.

[0011] In some embodiments, the two sinking portions are spaced apart along the second direction, the first tab and the second tab are respectively formed at opposite ends of the electrode assembly along the second direction, and the second direction is perpendicular to the first direction. When the electrode terminals are electrically connected to the external connectors, the risk of interference between the two external connectors for electrically connecting the two electrode terminals is reduced.

[0012] In some embodiments, the housing further includes a third wall portion, the third wall portion connects the first wall portion and the second wall portion, and the sinking portion is directly connected to the third wall portion. By directly connecting the sinking portion to the third wall portion and arranging the electrode terminal in the sinking portion, the electrical connection between the electrode terminal and the external connector is made more convenient.

[0013] In some embodiments, the sinking portion and the connecting portion jointly define a receiving groove, at least a part of the electrode terminal is received in the receiving groove, and the receiving groove penetrates the outer surface of the third wall portion. By receiving at least a part of the electrode terminal in the receiving groove, the electrode terminal can protrude from the bottom wall of the receiving groove, facilitating the electrical connection between the external connector and the electrode terminal.

[0014] In some embodiments, the minimum dimension of the sunken portion in the thickness direction of the third wall portion is greater than the maximum dimension of the third wall portion in the first direction. By setting the minimum dimension of the sunken portion to be greater than the maximum dimension of the third wall portion in the first direction, the electrode terminal mounted in the sunken portion has a larger mounting space, and an electrode terminal with a dimension greater than the maximum dimension of the third wall portion in the first direction can be provided in the sunken portion, thereby improving the current-carrying capacity of the electrode terminal and facilitating the installation of the electrode terminal on the first wall portion.

[0015] In some embodiments, the housing further includes a third wall portion connecting the first wall portion and the second wall portion; the electrode assembly includes a main body portion, a first tab and a second tab, the first tab and the second tab having opposite polarities and both protruding from the main body portion; the battery cell has two electrode lead portions, the two electrode lead portions being electrically connected to the first tab and the second tab respectively, and in the first direction, the projections of the two electrode lead portions respectively at least partially overlap the projections of the first tab and the second tab, and at least one of the two electrode lead portions is an electrode terminal; in the thickness direction of the third wall portion, the projection of the connecting portion at least partially overlaps the projection of the main body portion. In the thickness direction of the third wall portion, the projection of the connecting portion at least partially overlaps the projection of the main body portion, so that at least a part of the connecting portion is located between the third wall portion and the electrode assembly, and the electrode assembly can be disposed on a side of the connecting portion away from the third wall portion, and the connecting portion can limit the movement of the electrode assembly in the battery cell, thereby facilitating the installation and arrangement of the electrode assembly.

[0016] In some embodiments, in the first direction, the electrode terminal has a second surface, the second surface being the surface of the electrode terminal farthest from the second wall portion, and the second surface is flush with the first surface. By setting the second surface to be flush with the first surface, it is easier for an external connector to be electrically connected to the electrode terminal, and the electrical connection between the external connector and the electrode terminal can be made more stable.

[0017] In some embodiments, the battery cell is in the shape of a cuboid, the length and width of the battery cell are both greater than the thickness of the battery cell, and the first direction is parallel to the thickness direction of the battery cell. The length and width of the battery cell are both greater than its thickness, and the first direction is parallel to the thickness direction of the battery cell, so that the first wall portion and the second wall portion are the two largest walls of the battery cell, and the electrode terminal is disposed on the first wall portion, which is beneficial to the installation of the electrode terminal.

[0018] In some embodiments, the housing includes a housing body and an end cap; one end of the housing body in the first direction has an opening; the end cap covers the opening; wherein, the first wall portion is the wall portion of the housing body opposite to the end cap in the first direction. By setting the end cap to be the wall portion opposite to the first wall portion in the first direction and disposing the electrode terminal on the first wall portion, it is beneficial to install the electrode terminal on the first wall portion and reduce the installation difficulty of the electrode terminal.

[0019] In some embodiments, the end cap includes a second wall portion and an edge portion. Along a first direction, the second wall portion is disposed opposite to the first wall portion. The edge portion surrounds the second wall portion and extends in a direction approaching the first wall portion. The edge portion is connected to the housing.

[0020] In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in any one of the embodiments of the first aspect.

[0021] In a third aspect, an embodiment of the present application provides an electrical device, including the battery cell provided in any one of the embodiments of the first aspect or the battery provided in any one of the embodiments of the second aspect. The battery cell is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces 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 thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Structural schematic diagram of a vehicle provided in some embodiments of the present application;

[0024] Figure 2 Explosion view of a battery provided in some embodiments of the present application;

[0025] Figure 3 Structural schematic diagram of a battery cell provided in some embodiments of the present application;

[0026] Figure 4 Explosion view of a battery cell provided in some embodiments of the present application;

[0027] Figure 5 For Figure 4 Partial enlarged view of area A in

[0028] Figure 6 Explosion view of a battery cell provided in some other embodiments of the present application;

[0029] Figure 7 Explosion view of a battery cell provided in some further embodiments of the present application;

[0030] Figure 8 Structural schematic diagram of a battery cell provided in some other embodiments of the present application;

[0031] Figure 9 For Figure 8 Partial enlarged view of area B in

[0032] Figure 10 Structural schematic diagram of a battery cell provided for some other embodiments of the present application;

[0033] Figure 11 For Figure 10 Partial enlarged view of area C in

[0034] Reference numerals: 1000 - vehicle; 100 - battery; 10 - battery cell; 1 - housing; 11 - end cap; 111 - edge portion; 12 - shell; 13 - first wall portion; 131 - first surface; 132 - stepped surface; 133 - wall body; 134 - connecting portion; 135 - sunken portion; 1351 - stacking area; 13511 - first edge; 136 - receiving groove; 14 - second wall portion; 15 - third wall portion; 2 - electrode assembly; 21 - tab; 211 - first tab; 212 - second tab; 22 - main body portion; 3 - electrode terminal; 31 - second surface; 20 - box body; 201 - first part; 202 - second part; 200 - controller; 300 - motor; X - first direction; Z - second direction; Y - third direction. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the 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 shall fall within the protection scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application 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 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 drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0037] 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 at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0038] In this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three cases: 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.

[0039] 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 in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0040] The term "a plurality of" as used in this application refers to two or more (including two).

[0041] 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.

[0042] 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.

[0043] 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) intercalate and deintercalate 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.

[0044] In some embodiments, the positive electrode can be a positive electrode tab, and the positive electrode tab 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.

[0045] 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 any one or both of the two opposite surfaces of the positive electrode current collector.

[0046] 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 electrode, 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 a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0047] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials 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 phosphate can include but are not limited to lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material 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 LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn2O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn0.1 O 2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0048] In some embodiments, the positive electrode can be made of porous metal. The porous metal can be porous nickel, porous copper, porous aluminum, or porous alloy, etc. When the porous metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the porous metal, and of course, the positive electrode active material can also be provided. As an example, a lithium source material, potassium metal or sodium metal can also be filled or / and deposited in the porous metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0049] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0050] As an example, the negative electrode current collector can be made of a metal foil, porous metal or 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. can be used. The porous metal can be porous nickel, porous copper, porous aluminum, porous alloy, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can 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.).

[0051] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0052] 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.

[0053] As an example, the negative electrode active material can be the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material can 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 can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, 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 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0054] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0055] 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.

[0056] 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 can be attached to the surfaces of the positive and negative electrodes.

[0057] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays the role of transporting ions and isolating the positive and negative electrodes.

[0058] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte plays the role of conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0059] In some embodiments, the electrolyte salts 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 difluorooxalate borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0060] In some embodiments, the solvent may 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 may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0061] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0062] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0063] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0064] As an example, the inorganic solid electrolyte may include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0065] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0066] 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.

[0067] In some embodiments, the electrode assembly is a stacked structure.

[0068] As an example, multiple positive electrode sheets and multiple negative electrode sheets may be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0069] As an example, multiple positive electrode sheets may 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.

[0070] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0071] As an example, a plurality of separators may be provided and are respectively disposed between any adjacent positive electrode plates or negative electrode plates.

[0072] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode plates or negative electrode plates by folding or winding.

[0073] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, or the like.

[0074] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive electrode tabs and negative electrode tabs.

[0075] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel 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.

[0076] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0077] 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.

[0078] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0079] In some embodiments, the battery may 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.

[0080] In some embodiments, the box body may be a part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0081] 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.

[0082] A battery cell generally may include a housing, an electrode assembly, and electrode terminals. The electrode assembly is accommodated within the housing, and the electrode terminals may be mounted on the wall of the housing. The electrode terminals generally protrude from the outer surface of the wall where they are located, so as to facilitate contact between an external connector and the electrode terminals, and realize the output or input of electrical energy of the battery cell. During the use of the battery cell, since the electrode terminals protrude from the outer surface of the wall where they are located, the part of the electrode terminal protruding from the outer surface of the wall where it is located is liable to be interfered by external components, liable to cause damage to the electrode terminals, damage the structure of the battery cell, and affect the service life of the battery cell.

[0083] In view of this, in order to reduce the risk of damage to the electrode terminals. An embodiment of the present application provides a battery cell. By disposing the electrode terminals on a first wall of the housing and making one end of the electrode terminals extending out of the housing not protrude from the first surface of the first wall, the risk of interference between external components and the electrode terminals can be reduced, thereby reducing the risk of damage to the electrode terminals due to contact with external components, and extending the service life of the battery cell.

[0084] The battery cell described in the embodiment of the present application is applicable to batteries and electrical equipment using the batteries.

[0085] The electrical equipment may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc.

[0086] For the convenience of description in the following embodiments, the electrical equipment is taken as a vehicle as an example for description.

[0087] Please refer to Figure 1 , Figure 1 FIG. 19 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may be used as an operating power source of the vehicle 1000.

[0088] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0089] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 , Figure 2 , which is an exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and battery cells 10. The box body 20 is used to accommodate the battery cells 10.

[0091] Among them, the box body 20 is a component for accommodating the battery cells 10. The box body 20 provides a accommodation space for the battery cells 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 may include a first part 201 and a second part 202. The first part 201 and the second part 202 cover each other to define a accommodation space for accommodating the battery cells 10. The first part 201 and the second part 202 can be of various shapes, such as a cuboid, a cylinder, etc. The first part 201 can be a hollow structure with one side open, and the second part 202 can also be a hollow structure with one side open. The open side of the second part 202 covers the open side of the first part 201, then the box body 20 with a accommodation space is formed. It can also be that the first part 201 is a hollow structure with one side open, and the second part 202 is a plate-like structure. The second part 202 covers the open side of the first part 201, then the box body 20 with a accommodation space is formed. The first part 201 and the second part 202 can be sealed through a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0092] In the battery 100, the battery cells 10 can be one or multiple. If there are multiple battery cells 10, the multiple battery cells 10 can 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 10. It can be that multiple battery cells 10 are first connected in series, parallel, or in a mixed connection to form a battery 100 module, and then multiple battery 100 modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 20. It can also be that all the battery cells 10 are directly connected in series, parallel, or in a mixed connection together, and then the whole formed by all the battery cells 10 is accommodated in the box body 20.

[0093] In some embodiments, the battery 100 may further include a busbar component. The plurality of battery cells 10 can be electrically connected through the busbar component to achieve series connection, parallel connection, or hybrid connection of the plurality of battery cells 10. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0094] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural diagram of the battery cell 10 provided in some embodiments of the present application; Figure 4 which is an exploded view of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes a housing 1 and an electrode assembly 2.

[0095] In some embodiments, the housing 1 may include a shell 12 and an end cap 11. The shell 12 has an opening, and the end cap 11 closes the opening of the shell 12.

[0096] The shell 12 is a component for accommodating the electrode assembly 2. The shell 12 can be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at opposite ends. The shell 12 can be in various shapes, such as cylindrical, cuboid, etc. The material of the shell 12 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0097] The end cap 11 is a component for closing the opening of the shell 12 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 11 and the shell 12 together define a receiving space for accommodating the electrode assembly 2, the electrolyte, and other components. The shape of the end cap 11 can be adapted to the shape of the housing 1. For example, when the shell 12 is a cuboid structure, the end cap 11 is a rectangular plate-like structure adapted to the housing 1. Another example is that when the shell 12 is cylindrical, the end cap 11 is a circular plate-like structure adapted to the shell 12. The material of the end cap 11 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 11 and the shell 12 can be the same or different.

[0098] In the embodiment where the shell 12 has an opening formed at one end, one end cap 11 can be correspondingly provided. In the embodiment where the shell 12 has openings formed at opposite ends, two end caps 11 can be correspondingly provided. The two end caps 11 respectively close the two openings of the shell 12, and the two end caps 11 and the shell 12 together define the receiving space.

[0099] In some embodiments, the battery cell 10 may further include an electrode terminal 3. The electrode terminal 3 is disposed on the housing 1 and is used for electrically connecting with the tab 21 of the electrode assembly 2 to output or input the electric energy of the battery cell 10. The electrode terminal 3 may be disposed on the housing body 12 of the housing 1 or on the end cover 11 of the housing 1. The electrode terminal 3 and the tab 21 may be directly connected. For example, the electrode terminal 3 and the tab 21 are connected by welding. The electrode terminal 3 and the tab 21 may also be indirectly connected. For example, the electrode terminal 3 and the tab 21 are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0100] As an example, such as Figure 3 and Figure 4 , one end of the housing body 12 is open, and there is one end cover 11 in the housing 1, and the end cover 11 closes the opening. The battery cell 10 includes two electrode terminals 3, and both of the two electrode terminals 3 pass through the wall portion of the housing body 12 and are electrically connected to the electrode assembly 2.

[0101] Please continue to refer to Figure 3 and Figure 4 . An embodiment of the present application provides a battery cell 10, including: a housing 1, an electrode assembly 2, and an electrode terminal 3. The housing 1 has a first wall portion 13 and a second wall portion 14 oppositely disposed along a first direction X. The electrode assembly 2 is accommodated in the housing 1. The electrode terminal 3 is disposed on the first wall portion 13, and the electrode terminal 3 is electrically connected to the electrode assembly 2. Wherein, along the first direction X, the first wall portion 13 has a first surface 131, and the first surface 131 is the surface of the first wall portion 13 that is farthest from the second wall portion 14, and the electrode terminal 3 does not protrude beyond the first surface 131 along the direction from the second wall portion 14 to the first wall portion 13.

[0102] The first wall portion 13 and the second wall portion 14 are two oppositely disposed wall portions on the battery cell 10. The battery cell 10 may be a cylindrical structure, and the first wall portion 13 and the second wall portion 14 are two wall portions oppositely disposed along the axial direction of the battery cell 10 in the housing. The battery cell 10 may also be a cuboid structure, the length and width of the battery cell 10 are both greater than the thickness of the battery cell 10, and the first wall portion 13 and the second wall portion 14 may be two wall portions oppositely disposed along the length direction of the battery cell 10 in the housing 1; the first wall portion 13 and the second wall portion 14 may also be two wall portions oppositely disposed along the width direction of the battery cell 10 in the housing 1; the first wall portion 13 and the second wall portion 14 may also be two wall portions oppositely disposed along the thickness direction of the battery cell 10 in the housing 1.

[0103] The first surface 131 is the surface of the first wall portion 13 that is farthest from the second wall portion 14 along the first direction X. The first surface 131 may be a plane; or the first surface 131 may be a curved surface, for example, the first surface 131 is an arc surface.

[0104] The electrode terminal 3 can be one or multiple. When there is one electrode terminal 3, the positive electrode tab of the electrode assembly 2 can be electrically connected to the electrode terminal 3, and the negative electrode tab of the electrode assembly 2 can be electrically connected to the housing 1. When there are multiple electrode terminals 3, a part of the electrode terminals 3 can be electrically connected to the positive electrode tab, and another part of the electrode terminals 3 can be electrically connected to the negative electrode tab. For example, when there are two electrode terminals 3, the two electrode terminals 3 are respectively electrically connected to the positive electrode tab and the negative electrode tab.

[0105] The electrode terminal 3 can be disposed on the first surface 131; for example, the first surface 131 has a lead-out hole, and the electrode terminal 3 has a second surface 31 that is farthest from the second wall portion 14 along the first direction X. It can be that the second surface 31 is located within the lead-out hole, or the second surface 31 is flush with the first surface 131, so that the electrode terminal 3 does not protrude from the first surface 131 in the direction from the second wall portion 14 to the first wall portion 13.

[0106] The first wall portion 13 can further have a stepped surface 132. Along the first direction X, the stepped surface 132 is disposed away from the second wall portion 14 and the stepped surface 132 is closer to the second wall portion 14 than the first surface 131. The electrode terminal 3 can be disposed on the stepped surface 132. For example, the stepped surface 132 can be provided with a lead-out hole, and along the first direction X, the electrode terminal 3 has a second surface 31 that is farthest from the second wall portion 14. It can be that the second surface 31 is located within the lead-out hole; or the second surface 31 is flush with the stepped surface 132; or the second surface 31 protrudes from the stepped surface 132, and the second surface 31 does not protrude from the first surface 131. Among them, the second surface 31 can be a plane or a curved surface.

[0107] In an embodiment where the first surface 131 is a curved surface, when the second surface 31 is a plane, it can be that the entire second surface 31 is located on the side of the first surface 131 along the direction from the first wall portion 13 to the second wall portion 14; or the first surface 131 has a first end portion that is farthest from the second wall portion 14 along the first direction X, and the second surface 31 is located on the side of the first end portion along the direction from the first wall portion 13 to the second wall portion 14; or along the direction from the second wall portion 14 to the first wall portion 13, the end of the second surface 31 that is farthest from the second wall portion 14 is flush with the first end portion. When the second surface is a curved surface, it can be that the entire second surface 31 is located on the side of the first surface 131 along the direction from the first wall portion 13 to the second wall portion 14; or the second surface 31 is located on the side of the first end portion along the direction from the first wall portion 13 to the second wall portion 14; or along the direction from the second wall portion 14 to the first wall portion 13, the end of the second surface 31 that is farthest from the second wall portion 14 is flush with the first end portion.

[0108] In the embodiments of the present application, by disposing the electrode terminal 3 on the first wall portion 13 and the electrode terminal 3 not protruding from the first surface 131 of the first wall portion 13 in the direction from the second wall portion 14 to the first wall portion 13, the risk of interference between the external components and the electrode terminal 3 can be reduced, thereby reducing the risk of damage to the electrode terminal 3 due to contact with external components and extending the service life of the battery cell 10.

[0109] In some embodiments, please refer to Figures 3 - 5 , Figure 5 which is Figure 4 a partial enlarged view of area A in

[0110] . The first wall portion 13 includes a wall main body 133, a connecting portion 134, and a sinking portion 135. The connecting portion 134 connects the wall main body 133 and the sinking portion 135. Along the first direction X, the sinking portion 135 is closer to the second wall portion 14 than the wall main body 133, and the electrode terminal 3 is disposed on the sinking portion 135. Figure 5 As shown in

[0111] , the battery cell 10 has a third wall portion 15 connecting the first wall portion 13 and the second wall portion 14. The sinking portion 135 is connected to the third wall portion 15. The sinking portion 135 and the connecting portion 134 form a groove portion. The groove portion penetrates the third wall portion 15 along the second direction Z. Two electrode terminals 3 are disposed on the sinking portion 135, and the two electrode terminals 3 are spaced apart along the third direction Y. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other in pairs.

[0111] It can be understood that the first surface 131 is the surface of the wall main body 133 that is farthest from the second wall portion 14 along the first direction X.

[0112] In the embodiment where the first wall portion 13 has a stepped surface 132, the stepped surface 132 can be the surface of the sinking portion 135 that is farthest from the second wall portion 14 along the first direction X.

[0113] When there is one electrode terminal 3, one electrode terminal 3 is disposed on the sinking portion 135; when there are multiple electrode terminals 3, multiple electrode terminals 3 are all disposed on the sinking portion 135.

[0114] By providing the sinking portion 135 and disposing the electrode terminal 3 in the sinking portion 135, the electrode terminal 3 can be exposed on the outer surface of the first wall portion 13 to facilitate the electrical connection between the electrode terminal 3 and an external connector. Also, the electrode terminal 3 can be prevented from protruding beyond the first surface 131 in the direction from the second wall portion 14 towards the first wall portion 13, reducing the risk of interference between the external components and the electrode terminal 3.

[0115] In some embodiments, the electrode assembly 2 includes a first tab 211 and a second tab 212 with opposite polarities. Two electrode terminals 3 are disposed in the sinking portion 135 and are electrically connected to the first tab 211 and the second tab 212 respectively.

[0116] As an example, please continue to refer to Figure 4 , the first tab 211 and the second tab 212 are located at the same end of the main body portion 22. The two electrode terminals 3 disposed in the sinking portion 135 are electrically connected to the first tab 211 and the second tab 212 respectively.

[0117] By providing two electrode terminals 3 electrically connected to the first tab 211 and the second tab 212 respectively, both of the two electrode terminals 3 can protrude from the sinking portion 135, making it more convenient for the external connector to be electrically connected to the electrode terminals 3.

[0118] In some embodiments, please refer to Figure 6 , Figure 6 which is an exploded view of the battery cell 10 provided in yet some other embodiments of the present application. The electrode assembly 2 includes a first tab 211 and a second tab 212 with opposite polarities. The electrode terminal 3 is insulatedly connected to the sinking portion 135, the electrode terminal 3 is electrically connected to the first tab 211, and the sinking portion 135 is electrically connected to the second tab 212.

[0119] The electrode assembly 2 may further include a main body portion 22. Both the first tab 211 and the second tab 212 are connected to the main body portion 22. The first tab 211 and the second tab 212 may be located at the same end of the main body portion 22 or at different ends of the main body portion 22.

[0120] The number of the sinking portions 135 may be one or more. When there is one sinking portion 135, the electrode terminal 3 may be insulatedly connected to the sinking portion 135 and the sinking portion 135 is electrically connected to the second tab 212. When there are multiple sinking portions 135, one of the multiple sinking portions 135 may be both insulatedly connected to the electrode terminal 3 and electrically connected to the second tab 212; or one of the multiple sinking portions 135 may be insulatedly connected to the electrode terminal 3 and another one may be electrically connected to the second tab 212.

[0121] By electrically connecting the first tab 211 with the electrode terminal 3 and electrically connecting the second tab 212 with the sinking portion 135, the processing difficulty of the battery cell 10 can be reduced and the processing cost can be saved.

[0122] In some embodiments, the first tab 211 and the second tab 212 are formed at the same end of the electrode assembly 2.

[0123] By forming the first tab 211 and the second tab 212 at the same end of the electrode assembly 2, the occupied space of the electrode assembly 2 in the housing 1 is reduced, and the energy density of the battery cell 10 can be improved.

[0124] In some embodiments, please refer to Figure 7 , Figure 7 is an exploded view of the battery cell 10 provided in still other embodiments of the present application. The battery cell 10 includes two electrode terminals 3, and the electrode assembly 2 includes a first tab 211 and a second tab 212 with opposite polarities. The first wall portion 13 includes two sinking portions 135, each sinking portion 135 is connected to the wall main body 133 through a connecting portion 134, the two sinking portions 135 are arranged at intervals, the two electrode terminals 3 are respectively arranged in the two sinking portions 135, and are respectively electrically connected to the first tab 211 and the second tab 212.

[0125] The two sinking portions 135 may be located at the same end of the first wall, or may be located at opposite ends of the first wall portion 13.

[0126] By providing the two sinking portions 135 and respectively arranging the two electrode terminals 3 in the two sinking portions 135, the two electrode terminals 3 can both protrude from the first wall portion 13 without protruding from the first surface 131, making the arrangement of the electrode terminals 3 more convenient.

[0127] In some embodiments, the two sinking portions 135 are arranged at intervals along the second direction Z, the first tab 211 and the second tab 212 are respectively formed at opposite ends of the electrode assembly 2 along the second direction Z, and the second direction Z is perpendicular to the first direction X.

[0128] As an example, as Figure 7 shown, the first tab 211 and the second tab 212 are arranged on opposite sides of the main body portion 22 along the second direction Z, the two sinking portions 135 are arranged on opposite sides of the first wall portion 13 along the second direction Z, the two electrode terminals 3 are respectively arranged in the two sinking portions 135, and are respectively electrically connected to the first tab 211 and the second tab 212.

[0129] In the above embodiments, when the electrode terminals 3 are electrically connected to the external connectors, the risk of interference between the two external connectors for electrically connecting the two electrode terminals 3 is reduced.

[0130] In some embodiments, please continue to refer to Figure 4 and Figure 5The housing 1 further includes a third wall portion 15. The third wall portion 15 connects the first wall portion 13 and the second wall portion 14, and the sunken portion 135 is directly connected to the third wall portion 15.

[0131] As an example, the sunken portion 135 and the connecting portion 134 form a receiving groove 136. The receiving groove 136 extends to the third wall portion 15 so that the sunken portion 135 is directly connected to the third wall portion 15.

[0132] By directly connecting the sunken portion 135 to the third wall portion 15 and disposing the electrode terminal 3 in the sunken portion 135, the electrical connection between the electrode terminal 3 and the external connector is made more convenient.

[0133] In some embodiments, the sunken portion 135 and the connecting portion 134 jointly define a receiving groove 136. At least a part of the electrode terminal 3 is received in the receiving groove 136, and the receiving groove 136 penetrates the outer surface of the third wall portion 15.

[0134] As an example, as Figure 4 and Figure 5 shown, the sunken portion 135 is provided with two lead holes. Two electrode terminals 3 respectively pass through the two lead holes. The second surfaces 31 of the two electrode terminals 3 both protrude from the step surface 132, and the second surfaces 31 of the two electrode terminals 3 do not protrude from the first surface 131.

[0135] By receiving at least a part of the electrode terminal 3 in the receiving groove 136, the electrode terminal 3 can protrude from the bottom wall of the receiving groove 136, facilitating the electrical connection between the external connector and the electrode terminal 3.

[0136] In some embodiments, the housing 1 further includes a third wall portion 15. The third wall portion 15 connects the first wall portion 13 and the second wall portion 14. The electrode assembly 2 includes a main body portion 22, a first tab 211 and a second tab 212. The first tab 211 and the second tab 212 have opposite polarities and both protrude from the main body portion 22. The battery cell 10 has two electrode lead-out portions. The two electrode lead-out portions are respectively electrically connected to the first tab 211 and the second tab 212. Along the first direction X, the projections of the two electrode lead-out portions respectively at least partially overlap the projections of the first tab 211 and the second tab 212. At least one of the two electrode lead-out portions is the electrode terminal 3. Along the thickness direction of the third wall portion 15, the projection of the connecting portion 134 at least partially overlaps the projection of the main body portion 22.

[0137] The electrode lead-out portion can be the electrode terminal 3 or a part of the housing 1. It can be that both of the two electrode lead-out portions are the electrode terminals 3, and the two electrode terminals 3 are both located in the sunken portion 135. It can also be that one of the two electrode lead-out portions is the electrode terminal 3 and the other is the housing 1, and the electrode terminal 3 is located in the sunken portion 135.

[0138] Along the first direction X, the projections of the two electrode lead portions may only partially overlap with the projections of the first tab 211 and the second tab 212 respectively; or the projections of the two electrode lead portions may completely overlap with the projections of the first tab 211 and the second tab 212 respectively.

[0139] Along the thickness direction of the third wall, the projection of the connecting portion 134 may partially overlap with the projection of the main body portion 22, or the projection of the connecting portion 134 may completely overlap with the projection of the main body portion 22, so that the connecting portion 134 and the main body portion 22 are arranged along the thickness direction of the third wall. Wherein, the thickness direction of the third wall portion 15 may be parallel to the second direction Z, and the second direction Z is perpendicular to the first direction X.

[0140] In the above embodiment, along the thickness direction of the third wall portion 15, the projection of the connecting portion 134 at least partially overlaps with the projection of the main body portion 22, so that at least a part of the connecting portion 134 is located between the third wall portion 15 and the electrode assembly 2. The electrode assembly 2 may be disposed on a side of the connecting portion 134 away from the third wall portion 15. The connecting portion 134 may limit the movement of the electrode assembly 2 within the battery cell 10, thereby facilitating the installation and arrangement of the electrode assembly 2.

[0141] In some embodiments, please refer to Figure 8 and Figure 9 , Figure 8 which is a schematic structural diagram of the battery cell 10 provided by some other embodiments of the present application; Figure 9 is Figure 8 a partial enlarged view of region B in

[0142] Along the thickness direction of the third wall portion 15, the electrode terminal 3 and the sunken portion 135 have a stacked region 1351. The minimum distance of the outer edge of the stacked region 1351 along the thickness direction of the third wall portion 15 is the minimum size of the sunken portion 135. The sunken portion 135 may be rectangular, circular or irregular in shape. The maximum size of the third wall portion 15 along the first direction X may be the maximum thickness of the battery cell 10 along the first direction X.

[0143] As an example, as Figure 9 shown, along the second direction Z, the sunken portion 135 has a stacked region 1351 stacked with the electrode terminal 3. The stacked region 1351 has two first edges 13511 oppositely arranged along the second direction Z. One of the two first edges 13511 is connected to the connecting portion 134, and the other is connected to the third wall portion 15. The minimum distance between the two first edges 13511 is the minimum size of the sunken portion 135. The second direction Z is perpendicular to the first direction X.

[0144] By setting the minimum size of the sinking portion 135 to be greater than the maximum size of the third wall portion 15 along the first direction X, the electrode terminal 3 installed in the sinking portion 135 has a larger installation space. The sinking portion 135 can be provided with an electrode terminal 3 whose size is greater than the maximum size of the third wall portion 15 along the first direction X, thereby improving the current-carrying capacity of the electrode terminal 3 and facilitating the installation of the electrode terminal 3 on the first wall portion 13.

[0145] In some embodiments, along the first direction X, the electrode terminal 3 has a second surface 31, and the second surface 31 is the surface of the electrode terminal 3 farthest from the second wall portion 14. The second surface 31 is flush with the first surface 131.

[0146] It can be that the second surface 31 is a plane and the second surface 31 is flush with the first surface 131; or it can be that the second surface 31 is a curved surface, and the end of the second surface 31 farthest from the second wall portion 14 along the first direction X is flush with the first surface 131.

[0147] By setting the second surface 31 to be flush with the first surface 131, it is easier for the external connector to be electrically connected to the electrode terminal 3, and the electrical connection between the external connector and the electrode terminal 3 can be made more stable.

[0148] In some embodiments, the battery cell 10 is in the shape of a cuboid, the length and width of the battery cell 10 are both greater than the thickness of the battery cell 10, and the first direction X is parallel to the thickness direction of the battery cell 10.

[0149] The first wall portion 13 and the second wall portion 14 are the two largest wall portions of the battery cell 10.

[0150] In the above embodiments, the length and width of the battery cell 10 are both greater than its thickness, and the first direction X is parallel to the thickness direction of the battery cell 10, so that the first wall portion 13 and the second wall portion 14 are the two largest wall portions of the battery cell 10, and the electrode terminal 3 is arranged on the first wall portion 13, which is beneficial to the installation of the electrode terminal 3.

[0151] In some embodiments, the housing 1 includes a housing body 12 and an end cap 11. One end of the housing body 12 along the first direction X has an opening. The end cap 11 covers the opening. Among them, the first wall portion 13 is the wall portion of the housing body 12 opposite to the end cap 11 along the first direction X. By setting the first wall portion 13 to be the wall portion of the housing body 12 opposite to the end cap 11 along the first direction X, the electrode terminal 3 can be assembled before the end cap 11 is installed, so that the electrode terminal 3 has a larger assembly space.

[0152] In some embodiments, please refer to Figure 10 and Figure 11 , Figure 10 is a schematic structural diagram of the battery cell 10 provided in still some other embodiments of the present application; Figure 11For Figure 10 A partial enlarged view of region C in Figure 10 . The end cap 11 includes a second wall portion 14 and an edge portion 111. Along the first direction X, the second wall portion 14 is disposed opposite to the first wall portion 13. The edge portion 111 surrounds the second wall portion 14 and extends along the direction close to the first wall portion 13. The edge portion 111 is connected to the housing 12. The edge portion 111 can be bonded, welded, etc. to the housing 12. By connecting the edge portion 111 to the housing 12, the contact area between the end cap 11 and the housing 12 is increased, which helps to enhance the connection strength between the end cap 11 and the housing 12.

[0153] An embodiment of the present application provides a battery 100, including the battery cell 10 provided in any one of the above embodiments.

[0154] An embodiment of the present application provides an electrical device, including the battery cell 10 provided in any one of the above embodiments or the battery 100 provided in any one of the above embodiments. The battery cell 10 is used to provide electrical energy to the electrical device.

[0155] Please refer to Figures 3 - 5 . An embodiment of the present application provides a battery cell 10, including a housing 1, an electrode assembly 2, and an electrode terminal 3. The electrode assembly 2 is accommodated in the housing 1. The housing 1 has a first wall portion 13 and a second wall portion 14 disposed opposite to each other along the first direction X. The first wall portion 13 and the second wall portion 14 are the two largest wall portions of the housing 1. The first wall portion 13 includes a wall main body 133, a connecting portion 134, and a sinking portion 135. The connecting portion 134 connects the wall main body 133 and the sinking portion 135. Along the first direction X, the sinking portion 135 is closer to the second wall portion 14 than the wall main body 133. The electrode terminal 3 is disposed on the first wall portion 13, and the electrode terminal 3 does not protrude from the first surface 131 along the direction from the second wall portion 14 to the first wall portion 13.

[0156] By disposing the electrode terminal 3 on the first wall portion 13, and the first wall portion 13 and the second wall portion 14 are the two largest wall portions of the housing 1, it is beneficial to the installation of the electrode terminal 3. By disposing the electrode terminal 3 on the first wall portion 13 and the electrode terminal 3 does not protrude from the first surface 131 of the first wall portion 13 along the direction from the second wall portion 14 to the first wall portion 13, the risk of interference between the external components and the electrode terminal 3 can be reduced, thereby reducing the risk of damage to the electrode terminal 3 due to contact with the external components, and extending the service life of the battery cell 10.

[0157] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0158] 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 changes and modifications 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: The housing has a first wall portion and a second wall portion which are arranged opposite to each other along a first direction; an electrode assembly, contained in the housing; an electrode terminal, disposed on the first wall portion, the electrode terminal being electrically connected to the electrode assembly; Wherein, along the first direction, the first wall portion has a first surface, the first surface is the surface of the first wall portion farthest from the second wall portion, and the electrode terminal does not protrude from the first surface along the direction from the second wall portion to the first wall portion.

2. The battery cell according to claim 1, characterized in that: The first wall portion includes a wall body, a connecting portion and a sinking portion, the connecting portion connects the wall body and the sinking portion, along the first direction, the sinking portion is closer to the second wall portion than the wall body, and the electrode terminal is arranged in the sinking portion.

3. The battery cell according to claim 2, characterized in that: The electrode assembly comprises a first electrode tab and a second electrode tab with opposite polarities, the electrode terminal is insulated and connected to the sinking portion, the electrode terminal is electrically connected to the first electrode tab, and the sinking portion is electrically connected to the second electrode tab.

4. The battery cell according to claim 2, characterized in that: The electrode assembly includes a first electrode tab and a second electrode tab with opposite polarities. The sinking portion is provided with two electrode terminals, and the two electrode terminals are electrically connected to the first electrode tab and the second electrode tab respectively.

5. The battery cell according to claim 3, characterized in that: The first electrode tab and the second electrode tab are formed at the same end of the electrode assembly.

6. The battery cell according to claim 2, characterized in that: The battery cell comprises two electrode terminals, and the electrode assembly comprises a first electrode tab and a second electrode tab with opposite polarities; The first wall portion includes two sinking portions, each of which is connected to the wall body via a connecting portion, the two sinking portions are arranged at intervals, and the two electrode terminals are respectively provided with two sinking portions, which are respectively electrically connected to the first pole tab and the second pole tab.

7. The battery cell according to claim 6, characterized in that: The two sinking portions are spaced apart along a second direction, and the first electrode tab and the second electrode tab are respectively formed at two opposite ends of the electrode assembly along the second direction, and the second direction is perpendicular to the first direction.

8. The battery cell according to claim 2, characterized in that: The housing further includes a third wall portion, the third wall portion connects the first wall portion and the second wall portion, and the sinking portion is directly connected to the third wall portion.

9. The battery cell according to claim 8, characterized in that: The sinking portion and the connecting portion together define a receiving groove, in which at least a portion of the electrode terminal is received, and the receiving groove penetrates through the outer surface of the third wall portion.

10. The battery cell according to claim 8, characterized in that: A minimum dimension of the sinking portion along a thickness direction of the third wall portion is greater than a maximum dimension of the third wall portion along the first direction.

11. The battery cell according to claim 2, characterized in that: The housing further comprises a third wall portion, the third wall portion connecting the first wall portion and the second wall portion; The electrode assembly comprises a main body, a first pole ear and a second pole ear, wherein the first pole ear and the second pole ear have opposite polarities and both protrude from the main body; The battery cell has two electrode lead-out portions, the two electrode lead-out portions are electrically connected to the first pole tab and the second pole tab respectively, and along the first direction, the projections of the two electrode lead-out portions at least partially overlap with the projections of the first pole tab and the projections of the second pole tab respectively, and at least one of the two electrode lead-out portions is the electrode terminal; Along the thickness direction of the third wall portion, a projection of the connecting portion at least partially overlaps with a projection of the main body portion.

12. The battery cell according to any one of claims 1 to 11, characterized in that: Along the first direction, the electrode terminal has a second surface, the second surface is a surface of the electrode terminal farthest from the second wall portion, and the second surface is flush with the first surface.

13. The battery cell according to any one of claims 1 to 11, characterized in that: The battery cell is in a rectangular parallelepiped shape, the length of the battery cell and the width of the battery cell are both greater than the thickness of the battery cell, and the first direction is parallel to the thickness direction of the battery cell.

14. The battery cell according to any one of claims 1 to 11, characterized in that: The housing comprises: A housing having an opening at one end along the first direction; An end cover, covering the opening; Wherein, the first wall portion is a wall portion in the shell that is opposite to the end cover along the first direction.

15. The battery cell according to claim 14, characterized in that: The end cover includes the second wall portion and an edge portion. Along the first direction, the second wall portion is arranged opposite to the first wall portion. The edge portion is arranged around the second wall portion and extends in a direction close to the first wall portion. The edge portion is connected to the shell.

16. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 15.

17. An electrical equipment, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 15 or a battery as claimed in claim 16, wherein the battery cell is used to provide electrical energy to the electrical device.

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