Battery monomer, battery device, electric equipment and energy storage equipment

Abstract

The utility model discloses a battery monomer, a battery device, electric equipment and energy storage equipment. The battery cell comprises a shell and at least one pair of electrode assemblies. The shell is provided with an accommodating space, and an electrode terminal is arranged on a first wall body of the shell; the electrode assemblies are arranged in the first direction and arranged in the containing space, each electrode assembly comprises a tab and a main body part, the tabs extend out of at least one end of the main body part in the second direction, and in the electrode assemblies, the tabs with the same polarity are electrically connected with the same electrode terminal; the tabs of the same pair of electrode assemblies comprise main body areas and protruding areas, the main body areas and the protruding areas jointly define avoiding spaces, the tabs, with the same polarity, of the pair of electrode assemblies are located in the avoiding spaces of each other, and the first direction and the second direction intersect with each other.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device, an electric equipment and an energy storage equipment. BACKGROUND

[0002] In the field of modern electronic equipment and new energy, the performance and stability of the battery as a key power supply component are crucial. The electrical connection between the tab and the electrode terminal in the battery monomer is a key link to ensure the normal operation of the battery. In many practical application scenarios, such as electric vehicles, electric tools, and aerospace equipment.

[0003] During the operation of the equipment, the battery output current generates heat between the tab and the electrode terminal, and a larger output current is easy to cause the electrical connection between the tab and the electrode terminal to fail. Therefore, how to improve the overcurrent capacity between the tab and the electrode terminal is a problem that needs to be solved at present. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a protruding area is added in the main body area of the electrode assembly, which can increase the electrical connection area between the tab and the electrode terminal, improve the overcurrent capacity of the electrode terminal and the tab, and improve the reliability of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, comprising:

[0006] a housing having a containing space, an electrode terminal is arranged on a first wall body of the housing; and

[0007] at least one pair of electrode assemblies arranged in the containing space along a first direction, each electrode assembly comprising a tab and a main body part, the tab extending from at least one end of the main body part along a second direction, in a pair of electrode assemblies, the tabs with the same polarity are electrically connected to the same electrode terminal, the tabs of the same pair of electrode assemblies each comprise a main body area and a protruding area, the main body area and the protruding area jointly define an avoiding space, the tabs with the same polarity of a pair of electrode assemblies are located in the avoiding space of each other, and the first direction and the second direction intersect.

[0008] The tabs with the same polarity of a pair of electrode assemblies are located in the avoiding space of each other, so that the tabs of a pair of electrode assemblies form a complementary structure after welding, which can increase the connection area of a single tab and an electrode terminal, and improve the overcurrent capacity between the tab and the electrode terminal without changing the size of the electrode terminal.

[0009] In some embodiments, the tab further comprises a root part and a bending part, the root part is connected with the main body part, the main body area is connected with the root part through the bending part, and the main body area and the protruding area are respectively electrically connected with the electrode terminal.

[0010] Thus, the tab can realize the complement of the avoidance space of the tab of the pair of electrode assemblies by the bending mode, so that the large surface of the tab is in contact with the electrode terminal, so as to increase the connection area of the tab and the electrode terminal, and improve the current carrying capacity between the tab and the electrode terminal.

[0011] In some embodiments, in the pair of electrode assemblies, the tabs with the same polarity are arranged in the first direction and the third direction, and the common plane of the first direction and the second direction intersects the third direction.

[0012] Thus, the possibility of short circuit caused by metal debris generated by interference of the two tabs can be reduced, so as to improve the safety of the battery monomer.

[0013] In some embodiments, one of the pair of electrode assemblies is a first electrode assembly, and the other of the pair of electrode assemblies is a second electrode assembly.

[0014] The protruding area of the first electrode assembly is located in the avoidance space of the second electrode assembly, the protruding area of the second electrode assembly is located in the avoidance space of the first electrode assembly, or the main body area of the first electrode assembly is located in the avoidance space of the second electrode assembly, and the main body area of the second electrode assembly is located in the avoidance space of the first electrode assembly.

[0015] Thus, the tab of the first electrode assembly and the tab of the second electrode assembly can form a complementary structure, which can increase the contact area of the tabs of the pair of electrode assemblies and the electrode terminal without changing the size of the electrode terminal, and improve the current carrying capacity.

[0016] In some embodiments, in the same electrode assembly, the protruding area includes a protruding area first edge, the main body area includes a main body area first edge, the protruding area first edge and the main body area first edge intersect and jointly define the avoidance space, and the protruding area first edge and the main body area first edge are connected by a round corner.

[0017] The protruding area first edge and the main body area first edge are connected by a round corner, so that when the tab is subjected to a pulling force in the welding or vibration process, the stress concentration at the connection position of the protruding area first edge and the main body area first edge can be reduced, and the possibility of tab fracture can be reduced.

[0018] In some embodiments, the protruding area further includes a protruding area second edge, the protruding area second edge and the protruding area first edge are arranged in the third direction, the main body area further includes a main body area second edge, the protruding area second edge and the main body area second edge are located on the same side of the tab along the third direction and are arranged flush, and the common plane of the first direction and the second direction intersects the third direction.

[0019] The second edge of the protruding area and the second edge of the main body area are arranged flush, so that the same side edge of the tab in the first direction is more flat, facilitating manufacturing, while the possibility of short circuit of the tab caused by stress concentration due to unevenness of the second edge of the protruding area and the second edge of the main body area can be reduced, and the reliability of the battery cell in operation can be improved.

[0020] In some embodiments, the surface of the electrode terminal is provided with a first solder print directly connected with the main body area and a second solder print directly connected with the protruding area.

[0021] Compared with the conventional mode of electrically connecting the tab with the electrode terminal through the adapter piece, the structure of the adapter piece can be omitted to make the structure more compact, reduce the occupied space inside the shell, and enable the electrode assembly to be made larger under the premise of unchanged shell volume, so as to improve the energy density. Meanwhile, the omission of the adapter piece can omit the intermediate transition piece to reduce the possibility of connection failure and improve the connection reliability. Moreover, the polarity-same partial tabs of a pair of electrode assemblies are located in the avoidance space of each other, so that the tabs of the pair of electrode assemblies form a complementary structure after being welded with the electrode assembly, the welding area of the tabs can be increased, the connection strength of the tabs and the electrode terminal can be improved, in the case of vibration, the external force generated by vibration can be uniformly dispersed in a larger area of the tab, the stress concentration phenomenon of the tab is reduced, the possibility of tab fracture is reduced, and the reliability and stability of the battery cell in operation are improved.

[0022] In some embodiments, in the third direction, the size of the main body area is W1, the size of the protruding area is W2, the width of the first solder print is W3, and the width of the second solder print is W4, W1-W2≥W3, and / or W1-W2≥W4, and the plane where the first direction and the second direction are located intersects the third direction.

[0023] In this way, the size of the tab located in the avoidance space in the third direction can be greater than or equal to the width of the solder print, so that the tab located in the avoidance space can be welded with the electrode terminal, thereby improving the welding strength.

[0024] In some embodiments, at least part of the first solder print extends in the third direction, and the plane where the first direction and the second direction are located intersects the third direction; and / or at least part of the second solder print extends in the second direction.

[0025] In this way, two long strip-shaped solder prints with different extension directions can be formed in the main body area and the protruding area respectively, so as to increase the connection strength of the tab and the electrode terminal and reduce the possibility of tab fracture due to vibration.

[0026] In some embodiments, at least part of the first solder print extends in the third direction, at least part of the second solder print extends in the second direction, the first solder print and the second solder print are connected, and the plane where the first direction and the second direction are located intersects the third direction.

[0027] The first and second welds are connected, so that the weld length of the tab and the electrode terminal is further increased to improve the connection strength.

[0028] In some embodiments, the tab with the main body region and the protruding region is provided with multiple layers, the multiple layers of the tab are stacked and welded, and the third and fourth welds are formed one-to-one on the surface of the main body region and the surface of the protruding region, respectively.

[0029] The multiple layers of the tab form the third and fourth welds one-to-one on the surface of the main body region and the surface of the protruding region, respectively, which can improve the welding strength between the multiple layers of the tab to reduce the possibility of single-layer or multi-layer tab breakage due to insufficient welding strength in the case of vibration.

[0030] In some embodiments, at least part of the third weld extends in a third direction, and the first and second directions are in a plane that intersects the third direction; and / or, at least part of the fourth weld extends in the first direction.

[0031] At least part of the third weld extends in the third direction, and / or at least part of the fourth weld extends in the first direction, so that the third and / or fourth welds form a long strip shape, which can increase the welding area to improve the connection strength of the multiple layers of the tab, thereby reducing the possibility of tab breakage due to vibration.

[0032] In some embodiments, the third and fourth welds are connected.

[0033] So that the welding area is further increased to improve the welding strength of the multiple layers of the tab to reduce the possibility of single-layer or multi-layer tab breakage due to insufficient welding strength in the case of vibration.

[0034] In a second aspect, the present application provides a battery device, comprising:

[0035] A battery cell assembly comprising a plurality of battery cells of the first aspect;

[0036] A box, the inside of the box has a containing space, and the battery cell assembly is located in the containing space.

[0037] Since the battery device comprises all the technical features of the battery cell of the first aspect described above, the effects are the same as described above, and will not be repeated here.

[0038] In a third aspect, the present application provides a power-using device, comprising the battery device of the second aspect, and the battery device is used to provide electric energy to the power-using device.

[0039] Since the power-using device comprises all the technical features of the battery device of the second aspect described above, the effects are the same as described above, and will not be repeated here.

[0040] In a fourth aspect, the present application provides an energy storage device, comprising a cabinet and at least one battery cluster, the battery cluster being accommodated in the cabinet, and the battery cluster comprising a plurality of the battery apparatus of the second aspect.

[0041] Since the energy storage device comprises all the technical features of the battery apparatus of the second aspect, the effects are the same as described above, and will not be repeated here.

[0042] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0043] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, in all the drawings, the same reference numerals represent the same parts. In the drawings:

[0044] Figure 1 An exploded view of a battery monomer according to an embodiment of the present application;

[0045] Figure 2 A partial exploded view of a battery monomer according to an embodiment of the present application;

[0046] Figure 3 A structural view of a first embodiment of an electrode assembly in a battery monomer according to an embodiment of the present application;

[0047] Figure 4 A structural view of a second embodiment of an electrode assembly in a battery monomer according to an embodiment of the present application;

[0048] Figure 5 A structural view of a third embodiment of an electrode assembly in a battery monomer according to an embodiment of the present application;

[0049] Figure 6 A structural view of a first embodiment of a tab in a battery monomer according to an embodiment of the present application;

[0050] Figure 7 A structural view of a second embodiment of a tab in a battery monomer according to an embodiment of the present application;

[0051] Figure 8 A structural view of a third embodiment of a tab in a battery monomer according to an embodiment of the present application;

[0052] Figure 9 A structural view of a first wall of a housing in a battery monomer according to an embodiment of the present application;

[0053] Figure 10 Structure diagram of an embodiment of an electrode assembly in a battery cell of an embodiment of the present application;

[0054] Figure 11 Structure diagram of a kind of electric equipment for vehicle for an embodiment of the present application;

[0055] Figure 12 Exploded view of a kind of battery device for an embodiment of the present application;

[0056] Figure 13 Axonometric view of a kind of energy storage equipment for an embodiment of the present application.

[0057] The specific embodiment in the method of claim is as follows:

[0058] 1000, vehicle;200, controller;300, motor;

[0059] 100, battery device;

[0060] 10, battery cell assembly;11, battery cell;111, shell;1111, electrode terminal;11111, first welding mark;11112, second welding mark;1112, first wall body;112, electrode assembly;1121, main body part;1122, tab;11221, main body area;112211, third welding mark;112212, third edge;112213, fourth edge;11222, protruding area;112221, fourth welding mark;112222, first edge;112223, second edge;11223, avoiding space;11224, root;11225, bending part;

[0061] 20, box;21, first box;22, second box;

[0062] 2000, energy storage equipment;2100, cabinet;2200, battery cluster;

[0063] X, first direction;Y, second direction;Z, third direction. Specific embodiment

[0064] The embodiments of the technical scheme of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, so only as an example, and cannot limit the protection scope of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0066] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0067] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0068] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0069] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0070] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated, and therefore cannot be understood as limiting the embodiments of the present application.

[0071] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0072] At present, the tab of the electrode assembly in the battery cell is electrically connected with the electrode terminal. For the battery cell of a pair of electrode assemblies, the tabs with the same polarity are electrically welded with the same electrode terminal. Since the tab of the electrode assembly is rectangular, due to the limitation in the width direction (the size of the arrangement direction of a pair of electrode assemblies) of the tab, the connection area of the tab and the electrode terminal is limited, which affects the overcurrent area between the tab and the electrode terminal.

[0073] In view of this, the present application provides a battery cell. The tabs with the same polarity of a pair of electrode assemblies are located in the avoiding space of each other, so that the tabs of a pair of electrode assemblies form a complementary structure after being welded with the electrode assembly. Compared with the rectangular structure of the tab, the width (the size of the arrangement direction of a pair of electrode assemblies) of a single tab can be increased to increase the connection area of a single tab and the electrode terminal, and the overcurrent capacity between the tab and the electrode terminal can be improved without changing the size of the electrode terminal.

[0074] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0075] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0076] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0077] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0078] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0079] As an example, the battery cell assembly can also be accommodated in the case by fixing a plurality of battery cells directly to the case.

[0080] As an example, the case can include a first case and a second case. The first case and the second case are coupled to accommodate the battery cell assembly.

[0081] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0082] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor panel of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0083] The technical solutions described in the embodiments of the present application are applicable to various electric equipment using battery devices, such as electric vehicles, vehicles, ships, and spacecraft, for example, spacecraft including airplanes, rockets, space shuttles, and spacecraft.

[0084] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after the battery cell is discharged.

[0085] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0086] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charging and discharging of the battery cell, active ions such as lithium ions are inserted and extracted between the positive electrode and the negative electrode. The separator disposed between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0087] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0089] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer fiber layer and a metal layer. The composite current collector can be formed by forming metal materials such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys on a polymer substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0090] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4). 4， It can also be abbreviated as LFP), lithium iron phosphate and carbon composite materials, lithium manganese phosphate (such as LiMnPO4), etc. 4) At least one of lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO). 2) Lithium nickel oxide (such as LiNiO) 2) Lithium manganese oxides (such as LiMnO2, 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， It can also be abbreviated as NCM 333 LiNi 0.5 Co 0.2 Mn 0.3 O 2， It can also be abbreviated as NCM 523 LiNi 0.5 Co 0.25 Mn 0.25 O 2， It can also be abbreviated as NCM 211 LiNi 0.6 Co 0.2 Mn 0.2 O 2， It can also be abbreviated as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O2， Also referred to as NCM 811) LiNi 0.8 Co 0.15 Al 0.05 O 2) and modified compounds thereof. Modified compounds refer to substances obtained by modification means such as doping or coating on the basis of the above-mentioned substances.

[0091] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, etc. When the foam metal is used as the positive electrode, the foam metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the positive electrode active material is filled and / or deposited in the foam metal.

[0092] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0093] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material fiber layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a substrate of a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0094] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0095] As an example, the negative electrode current collector has two opposite surfaces in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0097] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as the negative electrode sheet, the foamed metal surface can be free of the negative active material, or can be provided with the negative active material.

[0098] As an example, the negative active material can be filled and / or deposited within the negative current collector.

[0099] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0100] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0101] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0102] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0103] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and separate the positive and negative electrodes.

[0104] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of the electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0105] The liquid electrolyte includes an electrolyte salt and a solvent.

[0106] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bistrifluoromethylsulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium bioric oxalate, lithium difluoroboric dioxalate, and lithium tetrafluorophosphoric oxalate.

[0107] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, 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, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from 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, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0108] In some embodiments, the electrolyte solution can further include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / fast charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0109] In some embodiments, the gel-type electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0110] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0111] As an example, the polymer of the polymer solid-state electrolyte can include a polyether polyethylene oxide, a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0112] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor lithium germanium phosphorus sulfide, argyrodite, amorphous sulfide, and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte).

[0113] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0114] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0115] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0116] In some embodiments, the electrode assembly is a laminated structure.

[0117] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately laminated.

[0118] As an example, a plurality of positive electrode sheets are provided, and the negative electrode sheet is folded to form a plurality of folded segments which are laminated.

[0119] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments which are laminated.

[0120] As an example, a plurality of isolation pieces are provided, and each isolation piece is arranged between any adjacent positive electrode sheet or negative electrode sheet.

[0121] As an example, the isolation pieces are continuously arranged, and each isolation piece is arranged between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0122] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0123] In some embodiments, the electrode assembly is provided with a tab, and the tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0124] In some embodiments, the battery cell can include a shell. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), or a composite metal shell (such as a copper-aluminum composite shell, etc.). In some embodiments, the shell can be a sealed structure or a non-sealed structure.

[0125] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell (for example, a hexagonal prismatic battery cell, etc.), which is not particularly limited in the present application.

[0126] In some embodiments, the shell includes an end cap and a shell body, and the shell body is provided with an opening, and the end cap is arranged on the opening. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0127] In some embodiments, at least one electrode terminal is arranged on the shell, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or indirectly connected to the tab through a current collecting member. The electrode terminal can be arranged on the end cap or the shell body.

[0128] In some embodiments, a pressure relief mechanism is arranged on the shell. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0129] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold is designed differently according to design requirements. The threshold can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0130] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0131] As an example, the pressure relief mechanism can also be provided separately from the housing and connected to the housing.

[0132] As used herein, "actuation" refers to the pressure relief mechanism performing an action or being activated to a certain state, thereby allowing the internal pressure and temperature of the battery cell to be released. The action performed by the pressure relief mechanism can include, but is not limited to, a component in the pressure relief mechanism moving to form an exhaust passage, at least a portion of the pressure relief mechanism breaking, shattering, being torn or opened, and the like. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell are discharged outward from the actuated part as exhaust. In this way, the battery cell can be pressure released and temperature released under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0133] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell.

[0134] As used herein, the exhaust from the battery cell includes, but is not limited to, electrolyte, dissolved or split positive and negative plates, fragments of the separator, high-temperature and high-pressure gas generated by reaction, flame, and the like.

[0135] The following embodiments are described with reference to Figures 1-9 A battery cell 11 according to some embodiments of the present application is described by way of example.

[0136] The battery cell 11 comprises a shell 111 and at least one pair of electrode assemblies 112. The shell 111 has an accommodating space inside, and a first wall body 1112 of the shell 111 is provided with an electrode terminal 1111. The pair of electrode assemblies 112 are arranged in a first direction X and arranged in the accommodating space, and each electrode assembly 112 comprises a tab 1122 and a main body part 1121, the tab 1122 extends from at least one end of the main body part 1121 in a second direction Y, the tabs 1122 with the same polarity are electrically connected to the same electrode terminal 1111, and the tabs 1122 of the same pair of electrode assemblies 112 each comprise a main body area 11221 and a protruding area 11222, the main body area 11221 and the protruding area 11222 jointly define an avoiding space 11223, and the tabs 1122 with the same polarity of the pair of electrode assemblies 112 are located in the avoiding space 11223 of each other, and the first direction X intersects the second direction Y.

[0137] The number of protruding areas 11222 can be one or more. The number of protruding areas 11222 of the same pair of electrode assemblies 112 can be the same or different. For example, in the same pair of electrode assemblies 112, the number of protruding areas 11222 of one electrode assembly 112 is one, the protruding area 11222 and the main body area 11221 jointly define two avoiding spaces 11223, the number of protruding areas 11222 of the other electrode assembly 112 is two, the two protruding areas 11222 of the other electrode assembly 112 are spaced apart and jointly define an avoiding space 11223 with the main body area 11221, and the protruding area 11222 of one electrode assembly 112 is located between the two protruding areas 11222 of the other electrode assembly 112. The number of protruding areas 11222 of the same pair of electrode assemblies 112 can also be one.

[0138] The shape of the main body area 11221 and the shape of the protruding area 11222 can be square or trapezoidal, etc., which is not limited in the present application.

[0139] The number of first welds 11111 can be one or more, and the number of second welds 11112 can be one or more.

[0140] The connection between the tab 1122 and the electrode terminal 1111 can be, but is not limited to, screw connection or welding, etc.

[0141] The traditional rectangular tab and the electrode terminal 1111 are connected by a screw, which is limited by the width direction of the tab 1122, the screw placement of the tab 1122 is limited, and the effective electrical contact area between the tab 1122 and the electrode terminal 1111 is limited. The protruding area 11222 can be electrically connected to the electrode terminal 1111 by screw or welding, etc., to increase the effective electrical contact area between the tab 1122 and the electrode terminal 1111, and to improve the current carrying capacity between the tab 1122 and the electrode terminal 1111.

[0142] The main body 1121 can be made by winding or laminating, and specifically includes two polar plates with opposite polarities and a separator between the two polar plates. The main body region 11221 and the protruding region 11222 can be connected to the electrode terminal 1111 by intermittent spot welding or continuous welding, and form corresponding first welds 11111 and second welds 11112.

[0143] The contour shape of the welds formed by welding the two polar tabs 1122 with the same polarity to the electrode terminal 1111 can be, but is not limited to, rectangular, circular, or elliptical, etc. For example, the welds formed by welding each polar tab 1122 to the electrode terminal 1111 can be arc-shaped.

[0144] The polar tabs with the same polarity of the pair of electrode assemblies 112 are located in the avoidance space of each other, so that the polar tabs 1122 of the pair of electrode assemblies 112 form a complementary structure after being welded to the electrode assembly 112, which can increase the connection area of the single polar tab 1122 to the electrode terminal 1111, and increase the current carrying capacity between the polar tab 1122 and the electrode terminal 1111 without changing the size of the electrode terminal 1111.

[0145] In some embodiments, referring to Figure 1 The polar tab 1122 further includes a root 11224 and a bent portion 11225, the root 11224 is connected to the main body 1121, and the main body region 11221 is connected to the root 11224 through the bent portion 11225. The main body region 11221 and the protruding region 11222 are electrically connected to the electrode terminal 1111.

[0146] In the pair of electrode assemblies 112, the polar tab 1122 of each electrode assembly 112 can be bent to make part of the polar tabs 1122 of the pair of electrode assemblies 112 located in the avoidance space 11223 of each other, and the angle of the bending can be less than or equal to 90°, or greater than 90°. In other examples, the thickness direction of the main body region 11221 and the thickness direction of the protruding region 11222 can be the same or different.

[0147] Therefore, the polar tab 1122 can be bent to realize the complementarity of the avoidance space of the polar tab 1122 of the pair of electrode assemblies 112, so that the large surface of the polar tab 1122 is in contact with the electrode terminal 1111, thereby increasing the connection area of the polar tab 1122 to the electrode terminal 1111 and improving the current carrying capacity between the polar tab 1122 and the electrode terminal 1111.

[0148] In some embodiments, referring to Figure 4 and Figure 5In the pair of electrode assemblies 112, the tabs 1122 of the same polarity are arranged in the first direction X and the third direction Z, and the first direction and the second direction are perpendicular to the third direction.

[0149] Thus, the possibility of short circuit caused by metal debris generated by interference between the two tabs 1122 can be reduced, and the safety of the battery cell 11 can be improved.

[0150] In some embodiments, referring to Figures 3-5 One of the pair of electrode assemblies 112 is a first electrode assembly, and the other of the pair of electrode assemblies 112 is a second electrode assembly. The protruding region 11222 of the first electrode assembly is located in the avoiding space 11223 of the second electrode assembly, and the protruding region 11222 of the second electrode assembly is located in the avoiding space 11223 of the first electrode assembly; or the main body region 11221 of the first electrode assembly is located in the avoiding space 11223 of the second electrode assembly, and the main body region 11221 of the second electrode assembly is located in the avoiding space 11223 of the first electrode assembly.

[0151] The protruding region 11222 of the first electrode assembly and the protruding region 11222 of the second electrode assembly can be arranged in a staggered manner. The main body region 11221 of the first electrode assembly and the main body region 11221 of the second electrode assembly can be arranged in a staggered manner or in a parallel manner.

[0152] Thus, the tabs 1122 of the first electrode assembly and the tabs 1122 of the second electrode assembly can form a complementary structure, and the contact area between the tabs 1122 of the pair of electrode assemblies 112 and the electrode terminal 1111 can be increased without changing the size of the electrode terminal 1111, and the overcurrent capacity can be improved.

[0153] In some embodiments, referring to Figure 8 In the same electrode assembly, the protruding region 11222 includes a protruding region first edge 112222, and the main body region 11221 includes a main body region first edge 112212. The protruding region first edge 112222 and the main body region first edge 112212 intersect and jointly define the avoiding space, and the protruding region first edge 112222 and the main body region first edge 112212 are connected by a rounded corner.

[0154] The protruding region first edge 112222 and the main body region first edge 112212 are connected by a rounded corner, and when the tab 1122 is subjected to a pulling force in the welding or vibration process, the stress concentration at the connection position of the protruding region first edge 112222 and the main body region first edge 112212 can be reduced, and the possibility of fracture of the tab 1122 can be reduced.

[0155] In some embodiments, referring to Figure 8The protruding area 11222 further comprises a protruding area second edge 112223, the protruding area first edge 112222 and the protruding area second edge 112223 are arranged along the third direction Z, the main body area 11221 further comprises a main body area second edge 112213, the protruding area second edge 112223 and the main body area second edge 112213 are located on the same side of the tab 1122 along the third direction Z, and the protruding area second edge 112223 and the main body area second edge 112213 are flush arranged.

[0156] The protruding area second edge 112223 and the main body area second edge 112213 are flush arranged, so that the same side edge of the tab 1122 along the first direction X is more smooth, the manufacturing is facilitated, and meanwhile the possibility of stress concentration of the protruding area second edge 112223 and the main body area second edge 112213 due to unevenness causing short circuit of the tab 1122 is reduced, and the reliability of the battery monomer 11 is improved.

[0157] In some embodiments, referring to Figure 10 The surface of the electrode terminal 1111 is provided with the first welding mark 11111 directly connected with the main body area 1121 and the second welding mark 11112 directly connected with the protruding area 11222.

[0158] The surface of the electrode terminal 1111 is provided with the first welding mark 11111 directly connected with the main body area 1121 and the second welding mark 11112 directly connected with the protruding area 11222.

[0159] Compared with the traditional mode that the tab 1122 is electrically connected with the electrode terminal 1111 through a transition piece, the structure of the transition piece can be omitted, so that the structure is more compact, the occupied space inside the shell 111 is reduced, the electrode assembly 112 can be made larger under the premise that the volume of the shell 111 is unchanged, so as to improve the energy density; meanwhile, the transition piece is omitted, so that the intermediate transition piece is omitted, the possibility of connection failure is reduced, and the reliability of the connection is improved; and the polarity same part tabs 1122 of a pair of electrode assemblies 112 are located in the avoidance space of each other, so that the tabs 1122 of the pair of electrode assemblies 112 form a complementary structure after being welded with the electrode assembly 112, the welding area of the tab 1122 is increased, the connection strength between the tab 1122 and the electrode terminal 1111 is improved, in the case of vibration, the external force generated by vibration can be uniformly dispersed in the larger area of the tab 1122, the stress concentration phenomenon of the tab 1122 is reduced, the possibility of fracture of the tab 1122 is reduced, and the reliability and stability of the battery monomer 11 are improved.

[0160] In some embodiments, referring to Figure 8 and Figure 9The size of the main body area 11221 along the third direction Z is W1, the size of the protruding area 11222 along the third direction Z is W2, the width of the first welding point 11111 is W3, and the width of the second welding point 11112 is W4, W1-W2≥W3, and / or W1-W2≥W4.

[0161] When the first welding point 11111 is a spot welding point, the width of the first welding point 11111 refers to the diameter of the first welding point 11111, and when the second welding point 11112 is a spot welding point, the width of the second welding point 11112 refers to the diameter of the second welding point 11112.

[0162] In this way, the size of the tab 1122 located in the avoiding space 11223 along the third direction Z is greater than or equal to the width of the welding point, so that the tab 1122 located in the avoiding space 11223 can be welded with the electrode terminal 1111, thereby improving the welding strength.

[0163] In some embodiments, referring to Figure 2 At least part of the first welding point 11111 extends along the third direction Z, and the first direction X and the second direction Y together form a plane intersecting the third direction Z; and / or at least part of the second welding point 11112 extends along the second direction Y.

[0164] In this way, two long strip-shaped welding points with different extension directions can be formed in the main body area 11221 and the protruding area 11222 respectively, so as to increase the connection strength of the tab 1122 and the electrode terminal 1111 and reduce the possibility of fracture of the tab 1122 due to vibration.

[0165] In some embodiments, referring to Figure 2 At least part of the first welding point 11111 extends along the third direction Z, at least part of the second welding point 11112 extends along the second direction Y, the first welding point 11111 and the second welding point 11112 are connected, and the first direction X and the second direction Y together form a plane intersecting the third direction Z.

[0166] The first welding point 11111 and the second welding point 11112 are connected, so that the welding length of the tab 1122 and the electrode terminal 1111 is further increased, thereby improving the connection strength. In other examples, the first welding point 11111 and the second welding point 11112 can be intermittent welding points.

[0167] In some embodiments, referring to Figures 4-9 The tab 1122 with the main body area 11221 and the protruding area 11222 is provided with multiple layers, the multiple layers of the tab 1122 are stacked and welded and connected, and the third welding point 112211 and the fourth welding point 112221 are formed one by one on the surface of the main body area 11221 and the surface of the protruding area 11222 respectively.

[0168] The number of the third welds 112211 and the fourth welds 112221 can be one or more. As the third welds 112211 can be multiple, the number of the third welds 112211 can also be one formed by continuous welding. The fourth welds 112221 can be made in a similar way to the third welds 112211. Figure 7 The structure diagram is shown in which the third welds 112211 and the fourth welds 112221 are both multiple, the multiple third welds 112211 are arranged in intervals and in rows, and the multiple fourth welds 112221 are arranged in intervals and in rows.

[0169] The multiple layer tabs 1122 form the third welds 112211 and the fourth welds 112221 on the surface of the main body area 11221 and the surface of the protruding area 11222 respectively, which can improve the welding strength between the multiple layer tabs 1122, and reduce the possibility of the tab 1122 breaking due to insufficient welding strength in the case of vibration.

[0170] In some embodiments, referring to Figure 4 and Figure 5 , at least part of the third welds 112211 extend along the third direction Z, and the first direction X and the second direction Y together form a plane intersecting the third direction Z; and / or, at least part of the fourth welds 112221 extend along the first direction X.

[0171] The third welds 112211 extend along the third direction Z, and / or the fourth welds 112221 extend along the first direction X, so that the third welds 112211 and / or the fourth welds 112221 form long strips, which can increase the welding area to improve the connection strength of the multiple layer tabs 1122, thereby reducing the possibility of the tab 1122 breaking due to vibration.

[0172] In some embodiments, referring to Figure 5 , Figure 6 and Figure 8 , the third welds 112211 and the fourth welds 112221 are connected.

[0173] Figure 5 and Figure 8 respectively show the structure diagram in which the third welds 112211 and the fourth welds 112221 intersect and are connected. Figure 6 The structure diagram is shown in which the third welds 112211 and the fourth welds 112221 are connected to form arc-shaped welds.

[0174] The welding area is further increased to improve the welding strength of the multi-layer tab 1122, so as to reduce the possibility of the single-layer or multi-layer tab 1122 breaking due to insufficient welding strength in the case of vibration.

[0175] The following embodiments are described with reference to Figure 12 A battery device 100 according to some embodiments of the present application is described as an example.

[0176] The battery device includes a battery cell assembly 10 and a case 20. The battery cell assembly 10 includes a plurality of battery cells 11 according to the above embodiments. The case 20 has an accommodation space inside, and the battery cell assembly 10 is located in the accommodation space.

[0177] The case 20 can include a first case 21 and a second case 22, and the first case 21 and the second case 22 are buckled to each other and jointly define the accommodation space.

[0178] The number of battery cell assemblies 10 can be one or more.

[0179] Since the battery device 100 includes all the technical features of the battery cell 11 according to the above embodiments, the effects are the same as described above, and will not be repeated here.

[0180] The following embodiments are described with reference to

[0181] The power consumption equipment includes the battery device 100 according to the above embodiments, and the battery device 100 is used to provide electric energy to the power consumption equipment.

[0182] The power consumption equipment can be, but is not limited to, an electric vehicle, a power tool, a vehicle 1000, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0183] Figure 11 The structure of the power consumption equipment according to some embodiments of the present application is a vehicle 1000. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, and the battery device 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 further includes a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0184] Due to the use of the battery device 100 of the above-mentioned embodiments, the use of the battery device 100 has the same effects as described above, and thus the description is omitted here.

[0185] The following embodiments are described with reference to Figure 13 The energy storage device 2000 is taken as an example to illustrate some embodiments of the present application.

[0186] The energy storage device 2000 includes a cabinet 2100 and at least one battery cluster 2200, the at least one battery cluster 2200 is accommodated in the cabinet 2100, and the battery cluster 2200 includes a plurality of battery devices 100 of the above-mentioned embodiments.

[0187] The energy storage device 2000 includes a cabinet 2100 and at least one battery cluster 2200, the at least one battery cluster 2200 is accommodated in the cabinet 2100, and the battery cluster 2200 includes a plurality of battery devices 100 of the above-mentioned embodiments.

[0188] The battery cluster 2200 can improve the voltage and capacity of the energy storage device 2000. The battery cluster 2200 can include a plurality of battery devices 100. The plurality of battery devices 100 are connected in series through the busbar component to improve the voltage of the energy storage device 2000. When the energy storage device 2000 includes a plurality of battery clusters 2200, the plurality of battery clusters 2200 are connected in parallel to improve the capacity of the energy storage device 2000.

[0189] The energy storage device 2000 can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 2000 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 2000 can store electrical energy during the low valley of electricity consumption, and provide electrical energy for related users or electrical equipment during the peak of electricity consumption. The energy storage system provided by the embodiments of the present application can be any power system that needs to use the energy storage device 2000.

[0190] Due to the use of the battery device 100 of the above-mentioned embodiments, the use of the battery device 100 has the same effects as described above, and thus the description is omitted here.

[0191] In a specific optional embodiment of the battery cell 11, the battery cell 11 comprises a housing 111 and at least one pair of electrode assemblies 112. The housing 111 has a receiving space, a first wall body 1112 of the housing 111 is provided with an electrode terminal 1111. The pair of electrode assemblies 112 are arranged in the receiving space along a first direction X, and each electrode assembly 112 comprises a tab 1122 and a main body 1121, the main body 1121 and the tab 1122 are electrically connected, in the pair of electrode assemblies 112, the tabs 1122 with the same polarity are electrically connected to the same electrode terminal 1111, and the tabs 1122 of the same electrode assembly 112 each comprise a main body region 11221, a protruding region 11222, a root region 11224 and a bending region 11225, the root region 11224 is connected to the main body 1121, and the main body region 11221 is connected to the root region 11224 through the bending region 11225. The main body region 11221 and the protruding region 11222 jointly define an avoiding space 11223, the tabs 1122 with the same polarity of the pair of electrode assemblies 112 are located in the avoiding spaces 11223 of each other, and the surface of the electrode terminal 1111 is provided with a first welding mark 11111 directly connected to the main body region 11221 and a second welding mark 11112 directly connected to the protruding region 11222, the arrangement direction of the electrode terminal 1111 and the housing 111 is a second direction Y, and the first direction X and the second direction Y intersect. Along a third direction Z, the size of the main body region 11221 is W1, the size of the protruding region 11222 is W2, the width of the first welding mark 11111 is W3, and the width of the second welding mark 11112 is W4, W1-W2≥W3, and / or W1-W2≥W4. At least part of the first welding mark 11111 extends along the third direction Z, at least part of the second welding mark 11112 extends along the second direction Y, the first welding mark 11111 and the second welding mark 11112 are connected, and the plane where the first direction X and the second direction Y are located intersects the third direction Z. The tab 1122 with the main body region 11221 and the protruding region 11222 is provided with multiple layers, the multiple layers of the tab 1122 are stacked and welded, and the third welding mark 112211 and the fourth welding mark 112221 are formed one by one on the surface of the main body region 11221 and the surface of the protruding region 11222, respectively. At least part of the third welding mark 112211 extends along the third direction Z, the plane where the first direction X and the second direction Y are located intersects the third direction Z, and at least part of the fourth welding mark 112221 extends along the first direction X.

[0192] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery, comprising: a shell having a containing space, the shell having a first wall body provided with an electrode terminal; at least one pair of electrode assemblies arranged in the containing space along a first direction, the electrode assembly comprising a tab and a main body part, the tab extending from at least one end of the main body part along a second direction, in a pair of the electrode assemblies, the tabs with the same polarity are electrically connected to the same electrode terminal, the tabs of the same pair of the electrode assemblies each comprise a main body area and a protruding area, the main body area and the protruding area jointly define an avoiding space, the tabs with the same polarity of a pair of the electrode assemblies are located in the avoiding space of each other, and the first direction and the second direction intersect. The tab further comprises a root and a bending part, the root is connected to the main body part, the main body area is connected to the root through the bending part, and the main body area and the protruding area are electrically connected to the electrode terminal respectively.

2. The battery cell of claim 1, wherein, One of the pair of the electrode assemblies is a first electrode assembly, and the other of the pair of the electrode assemblies is a second electrode assembly; 3. The battery cell of claim 1, wherein, the protruding area of the first electrode assembly is located in the avoiding space of the second electrode assembly, the protruding area of the second electrode assembly is located in the avoiding space of the first electrode assembly, or the main body area of the first electrode assembly is located in the avoiding space of the second electrode assembly, and the main body area of the second electrode assembly is located in the avoiding space of the first electrode assembly. In the same electrode assembly, the protruding area comprises a protruding area first edge, the main body area comprises a main body area first edge, the protruding area first edge and the main body area first edge intersect and jointly define the avoiding space, and the protruding area first edge and the main body area first edge are connected through a round corner.

4. The battery cell of claim 1, wherein, The protruding area further comprises a protruding area second edge, the protruding area second edge and the protruding area first edge are arranged in a third direction, the main body area further comprises a main body area second edge, the protruding area second edge and the main body area second edge are located on the same side of the tab along the third direction and are arranged in a flush manner, and a plane where the first direction and the second direction are located intersects the third direction.

5. The battery cell of claim 4, wherein, The surface of the electrode terminal is provided with a first welding mark directly connected to the main body area and a second welding mark directly connected to the protruding area.

6. The battery cell of any one of claims 1-5, wherein, In the third direction, the size of the main body area is W1, the size of the protruding area is W2, the width of the first welding mark is W3, the width of the second welding mark is W4, W1-W2>=W3, and / or W1-W2>=W4, and a plane where the first direction and the second direction are located intersects the third direction.

7. The battery cell of claim 6, wherein, At least part of the first welding mark extends along the third direction, and a plane where the first direction and the second direction are located intersects the third direction; and / or at least part of the second welding mark extends along the first direction.

8. The battery cell of claim 6, wherein, ​ 9. The battery cell of claim 6, wherein, At least part of the first weld extends in a third direction, at least part of the second weld extends in the first direction, the first weld and the second weld are connected, and the first direction and the second direction are in a common plane intersecting the third direction.

10. The battery cell of claim 6, wherein, The tab with the main area and the protruding area is provided with multiple layers, the multiple layers of the tab are stacked and welded, and the third weld and the fourth weld are formed one by one on the surface of the main area and the surface of the protruding area, respectively.

11. The battery cell of claim 10, wherein, At least part of the third weld extends in a third direction, and the first direction and the second direction are in a common plane intersecting the third direction; and / or, at least part of the fourth weld extends in the first direction.

12. The battery cell of claim 10, wherein, The third weld and the fourth weld are connected.

13. The battery cell of any one of claims 1-5, wherein, In a pair of the electrode assemblies, the tabs with the same polarity are arranged in the first direction and the third direction, and the first direction and the second direction are in a common plane intersecting the third direction.

14. A battery device characterized by comprising: The battery device includes: The battery cell assembly includes a plurality of battery cells as claimed in any one of claims 1-13. The battery device includes:

15. An electrical device, characterized by The battery device includes:

16. An energy storage device, comprising: The battery device includes: The battery device includes: The battery device includes:

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