CN219779170U

CN219779170U - Battery monomer, battery and electric equipment

Info

Publication number: CN219779170U
Application number: CN202320345615.2U
Authority: CN
Inventors: 雷育永; 郭志君; 李川; 严涵; 黄绍斌
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-09-29
Anticipated expiration: 2033-02-28

Abstract

The embodiment of the application provides a battery monomer, a battery and electric equipment. The battery cell includes a housing and a first insulator. The shell is provided with a welding printing area. The first insulating piece is arranged on the outer surface of the shell and is provided with a first thickening area, and at least one part of the welding printing area is covered by the first thickening area. Therefore, the risk of insulation failure of the battery cell caused by the fact that the welding area punctures the first insulating piece is reduced, and the insulation performance of the battery cell is improved.

Description

Battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

With the development of new energy technology, the battery is increasingly widely applied, for example, to mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like.

In the battery technology, the battery cell needs to have good insulating property to reduce the risk of the battery cell generating short circuit, causing ignition, explosion and the like. Therefore, how to improve the insulation performance of the battery cell is a problem to be solved in the battery technology.

Disclosure of Invention

The embodiment of the utility model provides a battery monomer, a battery and electric equipment, which can effectively improve the insulation performance of the battery monomer.

In a first aspect, an embodiment of the present utility model provides a battery cell including a housing and a first insulating member. The shell is provided with a welding printing area. The first insulating piece is arranged on the outer surface of the shell and is provided with a first thickening area, and at least one part of the welding printing area is covered by the first thickening area.

In the technical scheme, the first thickened area of the first insulating piece covers at least one part of the welding and printing area, so that the risk of insulating failure of the battery monomer caused by the fact that the welding and printing area punctures the first insulating piece is reduced, and the insulating performance of the battery monomer is improved.

In some embodiments, the first insulating member includes a first insulating portion and a second insulating portion disposed on an outer surface of the housing, the first insulating portion and the second insulating portion having a first overlap region, the first overlap region forming a first thickened region. The first overlapping region is formed by overlapping the first insulating part and the second insulating part, so that the first insulating part is locally thickened to correspondingly form a first thickened region, and the first thickened region is simple in forming mode.

In some embodiments, the first insulating member is wrapped around the outer surface of the housing along the circumferential direction of the housing, and two end portions of the first insulating member form a first insulating portion and a second insulating portion, respectively, along the circumferential direction of the housing. The first insulating piece is wrapped on the outer surface of the shell along the circumferential direction of the shell, so that more areas of the outer surface of the shell can be covered rapidly, and the insulating performance of the battery cell is improved. The first insulating piece is coated on the outer surface of the shell along the circumferential direction of the shell, and the two end parts of the first insulating piece are overlapped with each other, so that a first thickening area can be formed, and the forming mode of the first thickening area is simple. When the first insulating piece is coated on the outer surface of the shell, the position of the welding and printing area can be more conveniently confirmed, the first thickened area can be rapidly covered on the welding and printing area, and the production efficiency is improved.

In some embodiments, the housing includes a first wall portion, the solder pad is located on the first wall portion, and the first insulating portion and the second insulating portion collectively cover an outer surface of the first wall portion. The first insulating part and the second insulating part cover the outer surface of the first wall part with the welding area together, so that the insulation of the first wall part is realized, and the insulation performance of the battery cell is further improved.

In some embodiments, the first thickened region completely covers the solder pad region. The overlapping area of the first thickening area and the welding printing area is increased, and the risk that the welding printing area punctures the first insulating piece is further reduced.

In some embodiments, the first thickened region has a width W along the circumference of the shell ₁ The width of the welding printing area is W ₂ ，W ₁ ＞W ₂ . In this way, the first thickened region has more area available to cover the solder pad area.

In some embodiments, W ₁ -W ₂ And is more than or equal to 1mm. Therefore, the first thickened area has larger coverage allowance, is favorable for realizing that the first thickened area completely covers the welding printing area, can meet the alignment precision requirement of the first thickened area and the welding printing area, and improves the assembly efficiency of the first insulating piece and the shell.

In some embodiments, W ₁ And is more than or equal to 3mm. In this way, the first thickened region has a larger width and can cover more of the area of the solder pad.

In some embodiments, the solder pad includes a first protrusion protruding from the outer surface of the housing, the first protrusion protruding from the outer surface of the housing by a height H ₁ A first thickened regionThickness D ₁ ，H ₁ ＜D ₁ . Thus, even if the first convex part completely penetrates into the first thickened area, the first thickened area is difficult to puncture, and the risk of insulation failure of the battery cell is further reduced.

In some embodiments, the housing is formed from a sheet of material that includes a first end and a second end welded together along a perimeter of the housing to form a weld zone. The shaping mode of casing is simple, can effectively reduce the shaping degree of difficulty of casing. In addition, when the shell is formed, only the first end part and the second end part of the plate are required to be welded, a welding area is formed in the welding area of the first end part and the second end part, and the shell has good strength.

In some embodiments, the end face of the first end and the end face of the second end are welded together. On one hand, the two ends of the plate are connected and have no overlapped parts, so that materials are saved, and the production cost of the shell is reduced; on the other hand, the shell is smoother, the inner space of the shell can be increased, and the energy density of the battery cell can be improved.

In some embodiments, the first end and the second end have a second overlap region, and the solder mask region is located in the second overlap region. Therefore, the welding difficulty of the first end part and the second end part can be reduced, the contact area between the first end part and the second end part is increased, and the connection strength of the first end part and the second end part is improved.

In some embodiments, the housing includes a plurality of wall portions and a plurality of corner portions, each corner portion connecting adjacent two wall portions in a circumferential direction of the housing. Wherein the solder pad is located at the wall portion. The positioning difficulty of the shell in the welding forming process can be reduced, and the forming difficulty of the shell is further reduced. In addition, the weld zone is provided at the wall portion, not the corner portion, so that the connection strength of the housing at the welding position can be improved, thereby improving the strength of the housing.

In some embodiments, the plurality of walls includes a first wall and a second wall, the first wall and the second wall being connected by a corner, the second wall being a wall of the housing having a largest outer surface area, the weld zone being located in the first wall. Because the second wall portion is the biggest wall portion of outer surface area in the casing, when the inside electrode assembly of battery cell takes place to expand, the second wall portion is more out of shape in first wall portion relatively, and will weld the seal district and set up in the first wall portion that the deflection is less, on the one hand, can reduce the casing and weld the risk that the seal district was damaged when electrode assembly expands, on the other hand, can reduce the seal district and puncture the risk of first insulating part when electrode assembly expands.

In some embodiments, the plurality of wall portions includes two first wall portions disposed opposite each other along a first direction and two second wall portions disposed opposite each other along a second direction, the first direction being perpendicular to the second direction. Wherein at least one first wall portion is formed with a solder pad. The shell is of a quadrangular prism structure and is simple in structure.

In some embodiments, the battery cell further comprises a pressure relief mechanism, the pressure relief mechanism and the weld mark being located on the two wall portions, respectively. The pressure release mechanism and the welding area are not arranged on the same wall part, so that the influence on the pressure release mechanism in the process of welding the shell to form the welding area is reduced, and the reliability of the pressure release mechanism is improved.

In some embodiments, the plurality of wall portions includes two opposing first wall portions, and the pressure relief mechanism and the solder mask are located on the two first wall portions, respectively. Therefore, the pressure relief mechanism and the welding zone are further away from each other in the circumferential direction of the shell, and the influence on the pressure relief mechanism in the process of welding the shell to form the welding zone is further reduced.

In some embodiments, the battery cell further includes an electrode assembly and a second insulator. The electrode assembly is disposed within the housing. The second insulator is disposed between the electrode assembly and the case, and the second insulator is configured to insulate the electrode assembly from the case. The second insulating piece is provided with a second thickening area, and the second thickening area covers at least one part of the welding printing area. The second insulating member is positioned between the electrode assembly and the case, and serves to separate the electrode assembly and the case, so as to insulate the electrode assembly from the case. The second thickened region of the second insulating member covers at least a portion of the solder print region, so that the risk of insulation failure of the electrode assembly and the shell caused by the puncture of the second insulating member by the solder print region can be reduced.

In some embodiments, the second insulator includes a third insulator and a fourth insulator, the third insulator and the fourth insulator having a third overlap region, the third overlap region forming a second thickened region. The third overlapping region is formed by overlapping the third insulating part and the fourth insulating part, so that the second insulating part is locally thickened to correspondingly form a second thickened region, and the forming direction of the second thickened region is simple.

In some embodiments, the second insulating member is coated on the outer surface of the electrode assembly in the circumferential direction of the case, and both end portions of the second insulating member form a third insulating portion and a fourth insulating portion, respectively, in the circumferential direction of the case. The second insulating part is coated on the outer surface of the electrode assembly along the circumferential direction of the shell, so that more areas of the outer surface of the electrode assembly can be covered rapidly, and the insulating performance between the electrode assembly and the shell is improved. The second insulating part is coated on the outer surface of the electrode assembly along the circumferential direction of the shell, and the two end parts of the second insulating part are overlapped with each other, so that a second thickening area can be formed, and the forming mode of the second thickening area is simple.

In some embodiments, the second thickened region completely covers the solder pad region. The overlapping area of the second thickened area and the welding printing area is increased, and the risk that the welding printing area pierces the second insulating piece is further reduced.

In some embodiments, the solder pad includes a second protrusion protruding from the inner surface of the housing, the second protrusion protruding from the inner surface of the housing by a height H ₂ The thickness of the second thickening area is D ₂ ，H ₂ ＜D ₂ . In this way, even if the second protruding portion completely penetrates into the second thickened region, it is difficult to puncture the second thickened region, further reducing the risk of insulation failure between the electrode assembly and the case.

In some embodiments, the housing is a rectangular parallelepiped housing. The method is suitable for cuboid battery monomers and can meet the high-capacity requirement of the battery monomers.

In some embodiments, the housing defines an opening at opposite ends along the length of the housing. The length of the shell is a, the width of the shell is b, the height of the shell is c, and b is more than or equal to c and less than or equal to a/1.5. The shell is long-strip-shaped, so that the energy density of the battery monomer can be improved.

In some embodiments, the opposite ends of the housing form openings. The battery cell also comprises end covers, wherein the end covers correspond to the openings one by one, and the end covers seal the openings. When the battery monomer is assembled, the electrode assembly can enter the shell from the opening at any end of the shell, and the assembly efficiency of the battery monomer can be effectively improved.

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

In a third aspect, an embodiment of the present application provides an electric device, including the battery unit provided in any one of the embodiments of the first aspect, where the battery unit is used to provide electric energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in some embodiments of the present application;

fig. 3 is an isometric view of a battery cell according to some embodiments of the present application;

fig. 4 is an exploded view of the battery cell shown in fig. 3;

FIG. 5 is a partial cross-sectional view of the battery cell shown in FIG. 3;

FIG. 6 is an exploded view of a housing and a first insulator according to some embodiments of the present application;

FIG. 7 is an assembly view of the housing and the first insulator shown in FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 7 at A;

FIG. 9 is a partial view of the housing shown in FIG. 8;

FIG. 10 is a partial enlarged view at B in FIG. 8;

FIG. 11 is a schematic view of a housing according to some embodiments of the present application;

FIG. 12 is a schematic view of the housing of FIG. 11 after being unfolded;

FIG. 13 is a schematic view of the housing of FIG. 11 with the solder mask removed;

FIG. 14 is a schematic view of a housing according to other embodiments of the present application;

FIG. 15 is an enlarged view of a portion of FIG. 14 at C;

FIG. 16 is a schematic view showing an assembly of a housing and a first insulating member according to other embodiments of the present application;

FIG. 17 is a schematic view of the housing shown in FIG. 16;

FIG. 18 is an isometric view of a housing provided in some embodiments of the application;

fig. 19 is a schematic structural view of a battery cell according to some embodiments of the present application;

FIG. 20 is an enlarged view of a portion of FIG. 19 at D;

FIG. 21 is an enlarged view of a portion of FIG. 20 at E;

fig. 22 is an isometric view of a housing provided in accordance with still other embodiments of the present application.

Icon: 1-a housing; 11-a housing; 111-a solder printing area; 1111-a first protrusion; 1112-a second protrusion; 112-wall portion; 1121-a first wall portion; 11211-a first end; 11212-a second end; 11213-first end face; 11214—a second end face; 11215-a second overlap region; 1122-a second wall portion; 113-corner sections; 12-end caps; a 2-electrode assembly; 21-electrode lugs; 3-a first insulator; 31-a first thickened region; 32-a first insulating portion; 33-a second insulating portion; 4-a second insulator; 41-a second thickened region; 42-a third insulating portion; 43-fourth insulation part; 5-electrode terminals; 6-a pressure release mechanism; 10-battery cell; 20-a box body; 201-a first part; 202-a second part; 100-cell; 200-a controller; 300-motor; 1000-vehicle; x-a first direction; y-a second direction; z-third direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, 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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be a lithium 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 storage battery, etc., which is not limited by the embodiment of the application.

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 of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

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

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., liFePO4 (which may also be abbreviated as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., liMnPO 4), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (e.g., liCoO) ₂ ) Lithium nickel oxide (e.g. LiNiO) ₂ ) Lithium manganese oxide (e.g. LiMnO ₂ 、LiMn2O ₄ ) Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., liNi) _1/3 Co _1/3 Mn _1/3 O ₂ (also referred to as NCM) ₃₃₃ )、LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (also referred to as NCM) ₅₂₃ )、LiNi _0.5 Co _0.25 Mn _0.25 O ₂ (also referred to as NCM) ₂₁₁ )、LiNi _0.6 Co _0.2 Mn _0.2 O ₂ (also referred to as NCM) ₆₂₂ )、LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (also referred to as NCM) ₈₁₁ ) Lithium nickel cobalt aluminum oxide (e.g. LiNi _0.85 Co _0.15 Al _0.05 O ₂ ) And at least one of its modified compounds and the like.

In some embodiments, the positive electrode may be a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material, but may be provided with the positive electrode active material. As an example, a lithium source material, which is lithium metal and/or a lithium-rich material, potassium metal or sodium metal, may also be filled and/or deposited within the foam metal.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

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

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative active material for a battery cell, which is well known in the art, may be used. As an example, the anode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

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

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

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

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

Wherein the liquid electrolyte comprises an electrolyte salt and a solvent.

In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.

In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methylethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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 sulfone, and diethyl sulfone. The solvent may also be selected from ether solvents. 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.

The gel electrolyte comprises a skeleton network taking a polymer as an electrolyte and is matched with ionic liquid-lithium salt.

Wherein the solid electrolyte comprises a polymer solid electrolyte, an inorganic solid electrolyte and a composite solid electrolyte.

As examples, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single ion polymer, polyion liquid-lithium salt, cellulose, or the like.

As an example, the inorganic solid electrolyte may be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium super ion conductor (lithium germanium phosphorus sulfide, silver sulfur germanium mine), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

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

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

As an example, a plurality of positive electrode sheets and negative electrode sheets may be provided, respectively, and a plurality of positive electrode sheets and a plurality of negative electrode sheets may be alternately stacked.

As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of folded sections arranged in a stacked manner, with one positive electrode sheet sandwiched between adjacent folded sections.

As an example, the positive and negative electrode sheets are each folded to form a plurality of folded sections in a stacked arrangement.

As an example, the separator may be provided in plurality, respectively between any adjacent positive electrode sheet or negative electrode sheet.

As an example, the separator may be continuously provided, being disposed between any adjacent positive or negative electrode sheets by folding or winding.

In some embodiments, the electrode assembly may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

In some embodiments, the electrode assembly has tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.

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

As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, and the prismatic battery cell includes a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, etc., and the present application is not particularly limited.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

In the battery monomer, generally set up the insulating part in the outside of casing to realize battery monomer is insulating, in order to reduce the battery monomer and take place the short circuit, and cause the risk such as battery monomer fire, explosion.

The shell is generally formed by stamping or stretching a base material, the extrusion force applied to the base material is increased in the forming process, the damage is easy to occur, and the forming difficulty of the shell is high, especially a long-strip thin-wall shell.

In order to reduce the shaping degree of difficulty of casing, can form the casing through welded mode by panel, after the casing shaping, can form the welding zone in the welding position, the welding zone can lead to the fact the influence at the insulating part that is located the casing outside, and the welding zone probably pierces insulating part to cause battery monomer insulation failure.

In view of this, the embodiment of the application provides a battery cell, which is characterized in that a first thickened area is arranged on a first insulating piece positioned on the outer side of a shell, and at least a part of a welding area is covered by the first thickened area, so that the risk that the welding area punctures the first insulating piece to cause insulation failure of the battery cell is reduced, and the insulation performance of the battery cell is improved.

The battery cell described in the embodiment of the application is suitable for a battery and electric equipment using the battery cell.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or 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.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a battery cell 10 and a case 20, and the battery cell 10 is accommodated in the case 20.

The case 20 is a component for accommodating the battery cell 10, the case 20 provides an accommodating space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 201 and a second portion 202, the first portion 201 and the second portion 202 being overlapped with each other to define a receiving space for receiving the battery cell 10. The first portion 201 and the second portion 202 may be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first portion 201 may be a hollow structure with one side opened, and the second portion 202 may be a hollow structure with one side opened, and the open side of the second portion 202 is closed to the open side of the first portion 201, so as to form the case 20 having the accommodating space. The first portion 201 may be a hollow structure with one side open, the second portion 202 may be a plate-like structure, and the second portion 202 may be covered on the open side of the first portion 201 to form the case 20 having the accommodation space. The first portion 201 and the second portion 202 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.

In the battery 100, the number of the battery cells 10 may be one or a plurality. If there are multiple battery cells 10, the multiple battery cells 10 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 10. The plurality of battery cells 10 may be connected in series or parallel or in series-parallel to form a battery module, and the plurality of battery modules may be connected in series or parallel or in series-parallel to form a whole and be accommodated in the case 20. All the battery cells 10 may be directly connected in series, parallel or series-parallel, and then the whole body formed by all the battery cells 10 is accommodated in the case 20.

Referring to fig. 3-5, fig. 3 is an isometric view of a battery cell 10 according to some embodiments of the present application; fig. 4 is an exploded view of the battery cell 10 shown in fig. 3; fig. 5 is a partial cross-sectional view of the battery cell 10 shown in fig. 3. The battery cell 10 may include a case 1, an electrode assembly 2, a first insulating member 3, and a second insulating member 4.

The case 1 is a member for accommodating the electrode assembly 2, an electrolyte, and the like. As an example, the housing 1 may include a case 11 and an end cap 12.

The housing 11 may be a hollow structure having one end formed with an opening, or the housing 11 may be a hollow structure having opposite ends formed with an opening. The housing 11 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The material of the housing 11 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

The end cap 12 is a member closing the opening of the case 11 to isolate the inner environment of the battery cell 10 from the outer environment. The end cap 12 defines a receiving space for receiving the electrode assembly 2, electrolyte, and other components together with the case 11. The end cap 12 may be attached to the housing 11 by welding or crimping to close the opening of the housing 11. The shape of the end cover 12 may be adapted to the shape of the housing 1, for example, the housing 11 is a cuboid structure, the end cover 12 is a rectangular plate structure adapted to the housing 1, for example, the housing 11 is a cylindrical structure, and the end cover 12 is a circular plate structure adapted to the housing 11. The material of the end cap 12 may be various, for example, copper, iron, aluminum, steel, aluminum alloy, plastic, etc., and the material of the end cap 12 and the housing 11 may be the same or different.

In embodiments where the housing 11 is open at one end, the end caps 12 may be provided one for each. In the embodiment where the housing 11 is formed with openings at two opposite ends, two end caps 12 may be correspondingly disposed, and the two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define a receiving space.

The first insulating member 3 is a member disposed at the outer side of the case 11 to insulate the battery cell 10. The first insulating member 3 is made of insulating material, and may be plastic, rubber, or the like.

The second insulator 4 is a member provided inside the case 11 to insulate the case 11 from the electrode assembly 2. The second insulating member 4 is made of insulating material, and may be plastic, rubber, or the like.

In some embodiments, the battery cell 10 may further include an electrode terminal 5, the electrode terminal 5 being provided on the case 1, the electrode terminal 5 being for electrical connection with the tab 21 of the electrode assembly 2 to output electrical energy of the battery cell 10. The electrode terminal 5 may be provided on the case 11 of the case 1 or may be provided on the end cap 12 of the case 1. The electrode terminal 5 and the tab 21 may be directly connected, for example, the electrode terminal 5 and the tab 21 may be directly welded. The electrode terminal 5 and the tab 21 may be indirectly connected, for example, the electrode terminal 5 and the tab 21 may be indirectly connected through a current collecting member. The current collecting member may be a metal conductor such as copper, iron, aluminum, steel, aluminum alloy, or the like.

As an example, as shown in fig. 3 to 5, the casing 11 is a hollow structure with openings formed at opposite ends, end caps 12 are respectively provided at opposite ends of the casing 11, electrode terminals 5 are respectively provided on the end caps 12 at opposite ends of the casing 11, tabs 21 are respectively formed at opposite ends of the electrode assembly 2, the tab 21 at one end of the electrode assembly 2 is a positive tab, the tab 21 at the other end of the electrode assembly 2 is a negative tab, the electrode terminal 5 on one end cap 12 is electrically connected with the positive tab, and the electrode terminal 5 on the other end cap 12 is electrically connected with the negative tab.

Referring to fig. 6-9, fig. 6 is an exploded view of a housing 11 and a first insulating member 3 according to some embodiments of the present application; fig. 7 is an assembly view of the housing 11 and the first insulating member 3 shown in fig. 6; FIG. 8 is an enlarged view of a portion of FIG. 7 at A; fig. 9 is a partial view of the housing 11 shown in fig. 8. The embodiment of the application provides a battery cell 10, which comprises a shell 11 and a first insulating member 3. The housing 11 has a solder land 111. The first insulating member 3 is disposed on the outer surface of the housing 11, and the first insulating member 3 has a first thickened region 31, and the first thickened region 31 covers at least a portion of the solder pad 111.

The housing 11 may have an opening formed at one end or may have openings formed at opposite ends. The case 11 may be a prism, a cylinder, or the like, and the prism may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, or the like. The first insulating member 3 may realize insulation between the battery cells 10. The first insulating member 3 may entirely cover the outer surface of the housing 11, or may cover a part of the outer surface of the housing 11. The first insulator 3 may be provided to the outer surface of the housing 11 along the circumferential direction of the housing 11, the circumferential direction of the housing 11 coinciding with the circumferential direction of the opening of the housing 11.

The first insulating member 3 may be an integrally formed insulating sleeve structure; the first insulating member 3 may be formed by a sheet body around the housing 11. The first insulating member 3 may be formed by connecting both end portions of a sheet body to each other; the first insulating member 3 may be formed of a plurality of sheets, which are provided separately, and two adjacent sheets are connected to each other.

The welding area 111 is a welding part formed by welding two parts in the molding process of the shell 11 so as to realize the fixed connection of the two parts. The number of the lands 111 on the case 11 may be one or more. For example, the case 11 is formed by bending a plate material, and both end portions of the plate material are welded to each other, so that a welding area 111 is formed on the case 11; for another example, the housing 11 is formed by splicing a plurality of plates, two adjacent plates are welded to each other, and a welding area 111 is formed at the welding position of the two adjacent plates, so that a plurality of welding areas 111 are formed on the housing 11.

The first thickened region 31 is a region of partial thickening on the first insulating member 3. It is possible that the first insulating member 3 is locally raised to form a first thickened region 31; it is also possible that the two parts of the first insulating member 3 overlap each other so that the overlapping area is thicker to form the first thickened region 31.

The first thickened regions 31 may be in one-to-one correspondence with the solder lands 111, or one first thickened region 31 may be in correspondence with a plurality of solder lands 111. The first thickened region 31 covers at least a part of the solder mask region 111, i.e. the projection of the solder mask region 111 in the wall thickness direction of the housing 11 is at least partially located in the first thickened region 31. The first thickened region 31 may completely cover the solder print region 111, i.e. the projection of the solder print region 111 in the wall thickness direction of the housing 11 is entirely located within the first thickened region 31; the first thickened region 31 may also cover a part of the solder land 111, i.e. a part of the projection of the solder land 111 in the wall thickness direction of the housing 11 is located within the first thickened region 31.

The land may include a first protrusion 1111 protruding from the outer surface of the case 11, i.e., the first protrusion 1111 is a portion of the land 111 protruding from the outer surface of the case 11. The first protrusions 1111 may be solder or slag formed during the welding process of the housing 11, and the first protrusions 1111 may be portions protruding from the outer surface of the housing 11 after the welding portion of the housing 11 is fused. The first insulating member 3 may cover at least a portion of the first protruding portion 1111, i.e., the first insulating member 3 may cover the first protruding portion 1111 entirely, or may cover a portion of the first protruding portion 1111.

In the embodiment of the application, the first thickened area 31 of the first insulating member 3 covers at least a part of the welding area 111, so that the risk of insulation failure of the battery cell 10 caused by the welding area 111 piercing the first insulating member 3 is reduced, and the insulation performance of the battery cell 10 is improved.

In some embodiments, please continue to refer to fig. 8, the first insulating member 3 includes a first insulating portion 32 and a second insulating portion 33, the first insulating portion 32 and the second insulating portion 33 are disposed on the outer surface of the housing 11, the first insulating portion 32 and the second insulating portion 33 have a first overlapping region, and the first overlapping region forms the first thickened region 31.

The first insulating member 3 may be formed by a single piece around the housing 11, and the first insulating portion 32 and the second insulating portion 33 are two integrally formed portions of the first insulating member 3. The first insulating portion 32 and the second insulating portion 33 may be separately provided and connected, for example, the first insulating member 3 may be formed of a plurality of separately provided sheets provided around the housing 11, adjacent two sheets are connected to each other, all or part of one sheet forms the first insulating portion 32, all or part of the other sheet forms the second insulating portion 33, and the first insulating portion 32 and the second insulating portion 33 form the first overlap region. Of course, the number of sheets in the first insulating member 3 may be two, three, four or more.

The portion where the first insulation portion 32 and the second insulation portion 33 overlap each other is the first thickened region 31, and it is understood that a portion of the first thickened region 31 is located in the first insulation portion 32, and another portion of the first thickened region 31 is located in the second insulation portion 33. In the first thickened region 31, the first insulating portion 32 and the second insulating portion 33 may be connected by various means, such as adhesion, heat fusion connection, or the like. The thickness of the first insulating portion 32 may be equal to or different from the thickness of the second insulating portion 33.

The first insulation part 32 and the second insulation part 33 are overlapped to form a first overlapped area, so that the first insulation part 3 is locally thickened to correspondingly form a first thickened area 31, and the first thickened area 31 is formed in a simple mode. It will be appreciated that the first insulating member 3 has a two-layer insulating portion in the first overlapping region, and this region has a double-layer structure, and taking the example that the first insulating portion 32 is located on the side of the second insulating portion 33 facing the housing 11 in the first thickened region 31, even if the solder print region 111 pierces the first insulating portion 32, the second insulating portion 33 is not easy to pierce, and the second insulating portion 33 can still perform good insulation protection, so as to reduce the risk that the solder print region 111 pierces the first insulating member 3.

In some embodiments, please continue to refer to fig. 7 and 8, the first insulating member 3 is wrapped around the outer surface of the housing 11 along the circumferential direction of the housing 11, and the two end portions of the first insulating member 3 respectively form the first insulating portion 32 and the second insulating portion 33 along the circumferential direction of the housing 11.

In the present embodiment, the first insulating member 3 may be formed by a single piece disposed around the housing 11 in the circumferential direction of the housing 11. The first insulating portion 32 and the second insulating portion 33 are two end portions of the first insulating member 3, and it is understood that the two end portions of the first insulating member 3 form a first overlapping region. The first insulator 3 extends from the end face of one end in the forward direction of the circumferential direction of the housing 11 by a first preset distance L ₁ The portion in the region of (2) is one end of the first insulating member 3, the length of which is equal to the first preset distance L ₁ The method comprises the steps of carrying out a first treatment on the surface of the The first insulating member 3 extends from the end face of the other end in the opposite direction of the circumferential direction of the housing 11 by a second predetermined distance L ₂ The portion in the region of (2) is the other end of the first insulating member 3, the length of which is equal to the second preset distance L ₂ . A first preset distance L ₁ From a second preset distance L ₂ May be equal or different.

In this embodiment, the first insulating member 3 is wrapped on the outer surface of the housing 11 along the circumferential direction of the housing 11, so that more areas of the outer surface of the housing 11 can be covered quickly, thereby improving the insulating performance of the battery cell 10. The first insulation member 3 is wrapped on the outer surface of the housing 11 along the circumferential direction of the housing 11, and two ends of the first insulation member 3 are overlapped with each other, so that the first thickened region 31 can be formed, and the forming mode of the first thickened region 31 is simple. When the first insulating member 3 is coated on the outer surface of the housing 11, the position of the solder printing region 111 can be more conveniently confirmed, the first thickened region 31 can be rapidly covered on the solder printing region 111, and the production efficiency is improved.

In some embodiments, referring to fig. 8, the housing 11 includes a first wall 1121, the solder pad 111 is located on the first wall 1121, and the first insulating portion 32 and the second insulating portion 33 jointly cover the outer surface of the first wall 1121.

The first wall 1121 is one wall in the housing 11. For the first wall portion 1121 formed with the land 111, the first wall portion 1121 includes two parts that are welded together to form the land 111. Taking the case 11 as a rectangular parallelepiped case as an example, the case 11 includes four wall portions provided in the circumferential direction, two wall portions are provided opposite to each other in the width direction of the case 11, and two wall portions are provided in the height direction of the case 11, and may be the first wall portion 1121 in the width direction of the case 11, and may be the first wall portion 1121 in the length direction of the case 11.

The portion of the first insulating member 3 located at the first wall portion 1121 may be the first insulating portion 32 and the second insulating portion 33 such that the first insulating portion 32 and the second insulating portion 33 collectively cover the outer surface of the first wall portion 1121.

In the present embodiment, the first insulating portion 32 and the second insulating portion 33 cover the outer surface of the first wall portion 1121 where the solder pad 111 is formed together, so as to insulate the first wall portion 1121, thereby improving the insulating performance of the battery cell 10.

In some embodiments, please continue to refer to fig. 8, the first thickened region 31 completely covers the solder pad 111.

It will be appreciated that the projection of the weld zone 111 in the wall thickness direction of the housing 11 is entirely within the first thickened zone 31.

In the present embodiment, the first thickened region 31 completely covers the solder print region 111, so as to increase the overlapping area between the first thickened region 31 and the solder print region 111, and further reduce the risk that the solder print region 111 pierces the first insulating member 3.

In some embodiments, referring to fig. 10, fig. 10 is a partial enlarged view of fig. 8B. The width of the first thickened region 31 is W in the circumferential direction of the housing 11 ₁ The width of the solder pad 111 is W ₂ ，W ₁ ＞W ₂ 。

As an example, the housing 11 includes a first wall portion 1121, the land 111 is located in the first wall portion 1121, and the thickened region is located in the first wall portion 1121 to cover at least a portion of the land 111. The width direction of the first thickened region 31 coincides with the width direction of the land 111, both of which are perpendicular to the thickness direction of the first wall portion 1121.

In the present embodiment, W ₁ ＞W ₂ The first thickened region 31 has more area available to cover the solder pad 111.

In some embodiments, W ₁ -W ₂ ≥1mm。

W ₁ －W ₂ The point value may be any one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc., or a range value between any two.

In this embodiment, the first thickened area 31 has a larger coverage margin, which is beneficial to realizing that the first thickened area 31 completely covers the solder pad area 111, and can meet the alignment accuracy requirement of the first thickened area 31 and the solder pad area 111, and improve the assembly efficiency of the first insulating member 3 and the housing 11.

In some embodiments, W ₁ ≥3mm。

W ₁ The point value may be any one of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc., or a range value between any two of them.

When the case 11 is welded, the width of the land 111 formed by welding the case 11 is generally between 0.2mm and 2mm, and therefore, W ₁ And is more than or equal to 3mm, so that the first thickened area 31 has a larger width, can cover more areas of the welding printing area 111, and is beneficial to realizing the whole coverage of the welding printing area 1111 by the first thickened area 31.

In some embodiments, referring to fig. 10, the solder pad 111 includes a first protrusion 1111 protruding from the outer surface of the housing 11, and the height of the first protrusion 1111 protruding from the outer surface of the housing 11 is H ₁ The first thickened region 31 has a thickness D ₁ ，H ₁ ＜D ₁ 。

The height direction of the first projection 1111 and the thickness direction of the first thickened region 31 are bothThe thickness direction of the first wall 1121 is uniform. Taking the first insulation portion 32 and the second insulation portion 33 of the first insulation member 3 to form a first overlapping region, taking the corresponding formation of the first thickened region 31 as an example, the total thickness of the first insulation portion 32 and the second insulation portion 33 is the thickness D of the first thickened region 31 ₁ 。

In the present embodiment, H ₁ ＜D ₁ Even if the first protrusions 1111 completely penetrate into the first thickened region 31, it is difficult to puncture the first thickened region 31, further reducing the risk of insulation failure of the battery cell 10.

In some embodiments, referring to fig. 11, fig. 11 is a schematic structural diagram of a housing 11 according to some embodiments of the present application. The housing 11 is formed by bending a plate material, and the plate material includes a first end 11211 and a second end 11212 along the circumferential direction of the housing 11, and the first end 11211 and the second end 11212 are welded together to form the land 111.

The first end 11211 and the second end 11212 are two ends of the sheet material at the end to end. The solder land 111 is a solder land formed after the first end 11211 and the second end 11212 are welded, and the first end 11211 and the second end 11212 are fixedly connected by the solder land 111.

Before the shell 11 is formed, the plate may be a rectangular plate, and the rectangular plate may be bent to form a cylindrical shell, a prismatic shell, or the like. The prism may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. As an example, as shown in fig. 11, the housing 11 is a rectangular parallelepiped housing.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a housing 11 according to some embodiments of the present application after being unfolded. The sheet material has opposite end faces, first end face 11213 and second end face 11214, respectively, prior to forming the housing 11. The sheet material is offset from the first end face 11213 by a third predetermined distance L in a direction approaching the second end face 11214 ₃ The part in the region is a first end 11211 of the sheet material, the length of the first end 11211 being equal to a third predetermined distance L ₃ The method comprises the steps of carrying out a first treatment on the surface of the The sheet material is offset from the second end face 11214 by a fourth predetermined distance L in a direction approaching the first end face 11213 ₄ A second end 11212 of the sheet material in the range, the second end 11212 having a length equal toA second preset distance L ₄ . Wherein the third preset distance L ₃ From a fourth preset distance L ₄ May be equal or different.

As an example, the housing 11 includes a plurality of wall portions 112 and a plurality of corner portions 113, each corner portion 113 connecting two adjacent wall portions 112 in the circumferential direction of the housing 11. The land 111 may be located at the corner portion 113 or at the wall portion 112. As shown in fig. 11, taking the solder mask 111 as an example of the wall 112, the wall 112 includes two portions, which may be respectively used as the first end 11211 and the second end 11212.

In this embodiment, the molding mode of the housing 11 is simple, and the molding difficulty of the housing 11 can be effectively reduced. In addition, when forming the case 11, only the first and second ends 11211, 11212 of the plate material need be welded, and the weld zone 111 is formed in the welding area of the first and second ends 11211, 11212, and the case 11 has excellent strength.

In some embodiments, referring to fig. 11-13, fig. 13 is a schematic structural diagram of the housing 11 shown in fig. 11 after the solder lands 111 are removed. An end surface of the first end 11211 and an end surface of the second end 11212 are welded together.

The end face of the first end 11211 and the end face of the second end 11212 are two opposite end faces of the plate material of the housing 11. The end face of the first end 11211 and the end face of the second end 11212 are a first end face 11213 and a second end face 11214, respectively. The first end face 11213 and the second end face 11214 may be planar or curved, and the curved surface may be arcuate, serrated, etc. The first end face 11213 and the second end face 11214 are welded together, a welded joint is formed between the first end face 11213 and the second end face 11214, and a land 111 is formed at the welded joint position.

The outer surface of the first end 11211 may be flush with the outer surface of the second end 11212, and the portion of the solder land 111 protruding from the outer surface of the first end 11211 and the outer surface of the second end 11212 is the first protrusion 1111. Along the thickness direction of the first end 11211, the surface of the first end 11211 facing away from the inside of the housing 11 is the outer surface of the first end 11211; along the thickness direction of the second end 11212, the surface of the second end 11212 facing away from the inside of the housing 11 is the outer surface of the second end 11212. Wherein the thickness direction of the first end 11211 coincides with the thickness direction of the second end 11212.

In this embodiment, the end face of the first end 11211 and the end face of the second end 11212 are welded, on one hand, there is no overlapping portion after the two end portions of the plate are connected, so that materials are saved, and the production cost of the housing 11 is reduced; on the other hand, the housing 11 is made smoother, the inner space of the housing 11 can be increased, and the energy density of the battery cell 10 can be improved.

In some embodiments, referring to fig. 14 and 15, fig. 14 is a schematic structural diagram of a housing 11 according to other embodiments of the present application; fig. 15 is a partial enlarged view at C in fig. 14. The first end 11211 and the second end 11212 have a second overlap region 11215, and the solder pad 111 is located in the second overlap region 11215.

The portion where the first end 11211 and the second end 11212 overlap each other is referred to as a second overlapping region 11215, and it is understood that a portion of the second overlapping region 11215 is located at the first end 11211 and another portion of the second overlapping region 11215 is located at the second end 11212.

As an example, as shown in fig. 15, in the second overlap region 11215, the second end portion 11212 is located outside the first end portion 11211, and a portion of the land 111 protruding from the outer surface of the second end portion 11212 is a first convex portion 1111. Along the thickness direction of the second end 11212, the surface of the second end 11212 facing away from the inside of the housing 11 is the outer surface of the second end 11212.

In this embodiment, the first end portion 11211 and the second end portion 11212 have the second overlapping region 11215, and the solder pad 111 is located in the second overlapping region 11215, so that the welding difficulty of the first end portion 11211 and the second end portion 11212 can be reduced, the contact area between the first end portion 11211 and the second end portion 11212 can be increased, and the connection strength between the first end portion 11211 and the second end portion 11212 can be improved.

In some embodiments, referring to fig. 11, 13 and 14, the housing 11 includes a plurality of wall portions 112 and a plurality of corner portions 113, each corner portion 113 connecting two adjacent wall portions 112 in the circumferential direction of the housing 11. Wherein the solder pad 111 is located at the wall portion 112.

It will be appreciated that the corner portions 113 alternate with the wall portions 112 in the circumferential direction of the housing 11, and that the plurality of wall portions 112 and the plurality of corner portions 113 constitute an end-to-end closed structure. If the housing 11 is a triangular prism, the number of the wall portions 112 in the housing 11 may be three, and the three wall portions 112 are respectively located on three sides of the triangle; if the housing 11 is a quadrangular prism, the number of the wall portions 112 in the housing 11 may be four, and the four wall portions 112 are respectively located on four sides of the quadrangle; if the housing 11 is a pentagonal prism, the wall portions 112 in the housing 11 may be five, and the five wall portions 112 are respectively located on five sides of the pentagon; if the housing 11 is a hexagonal prism, the walls 112 in the housing 11 may be six, and the six walls 112 are located on six sides of the hexagon, respectively.

The corner portion 113 is a portion connecting the adjacent two wall portions 112 and located at a corner position of the housing 11. The cross section of the corner portion 113 may be circular arc-shaped, and the cross section of the corner portion 113 is parallel to the thickness direction of the two wall portions 112 connected to the corner portion 113.

In the case 11, if the number of welding positions of the case 11 is one, the number of welding areas 111 in the case 11 is one, and the welding areas 111 are correspondingly located on one wall 112 of the case 11. As shown in fig. 11, 13 and 14, taking an example in which the case 11 is formed by bending a plate material, and the first end 11211 and the second end 11212 of the plate material are welded to form the lands 111, the lands 111 in the case 11 are one.

In the case 11, if there are a plurality of welding positions of the case 11, there are a plurality of welding lands 111 in the case 11. Taking two welding positions of the housing 11 as an example, the number of welding areas 111 in the housing 11 is two, and the two welding areas 111 may be respectively located on the two wall portions 112 of the housing 11.

In this embodiment, the welding area 111 is disposed at the wall portion 112, but not the corner portion 113, so that the positioning difficulty of the housing 11 in the welding forming process can be reduced, the forming difficulty of the housing 11 is further reduced, and the connection strength of the housing 11 at the welding position can be improved, thereby improving the strength of the housing 11.

In some embodiments, the plurality of wall portions 112 includes a first wall portion 1121 and a second wall portion 1122, the first wall portion 1121 and the second wall portion 1122 are connected by one corner portion 113, the second wall portion 1122 is the wall portion 112 with the largest outer surface area in the housing 11, and the solder pad 111 is located in the first wall portion 1121.

The first wall portion 1121 and the second wall portion 1122 are two adjacent wall portions 112 in the housing 11, and the two wall portions 112 are connected by one corner portion 113. In the present embodiment, the case 1 may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, or the like. In the case 11, the first wall 1121 and the second wall 1122 may be one or a plurality of. For the first wall portion 1121 formed with the land 111, the first wall portion 1121 includes two parts that are welded together to form the land 111.

Since the second wall portion 1122 is the wall portion 112 having the largest outer surface area in the case 11, when the electrode assembly 2 inside the battery cell 10 (located inside the case 11) expands, the second wall portion 1122 is more easily deformed than the first wall portion 1121, and the solder mark region 111 is provided on the first wall portion 1121 having a smaller deformation amount, on the one hand, the risk that the case 11 is damaged at the solder mark region 111 when the electrode assembly 2 expands can be reduced, and on the other hand, the risk that the solder mark region 111 punctures the first insulating member 3 when the electrode assembly 2 expands can be reduced.

In some embodiments, referring to fig. 11, 13 and 14, the plurality of wall portions 112 includes two first wall portions 1121 and two second wall portions 1122, the two first wall portions 1121 are disposed opposite to each other along a first direction X, and the two second wall portions 1122 are disposed opposite to each other along a second direction Y, wherein the first direction X is perpendicular to the second direction Y. Wherein at least one first wall portion 1121 is formed with a solder pad 111.

The first direction X may be a height direction of the housing 11, and the second direction Y may be a width direction of the housing 11, the height of the housing 11 being greater than the width of the housing 11 such that the second wall portion 1122 is the wall portion 112 having the largest outer surface area in the housing 11.

In the two first wall portions 1121 of the case 11, the land 111 may be formed in one first wall portion 1121, or the land 111 may be formed in both first wall portions 1121. As an example, one first wall portion 1121 in the case 11 is formed with the land 111, and the first end portion 11211 and the second end portion 11212 of the plate material of the case 11 together constitute the first wall portion 1121.

In this embodiment, the housing 11 has a quadrangular prism structure, and the structure is simple. When the electrode assembly 2 inside the battery cell 10 expands, the expansion amount of the electrode assembly 2 in the second direction Y is larger than the expansion amount in the first direction X, so that the deformation amount of the two second wall portions 1122 pressed by the electrode assembly 2 is larger than the deformation amount of the two first wall portions 1121, and therefore, the impact of the expansion of the electrode assembly 2 on the welding region 111 can be reduced by providing the welding region 111 on the first wall portions 1121, the structural strength of the case 11 can be improved, and the risk of the welding region 111 piercing the first insulator 3 can be reduced.

As can be seen from the above embodiments, in the case 11, only one first wall portion 1121 is formed with the solder pad 111, in other embodiments, referring to fig. 16 and 17, fig. 16 is an assembly diagram of the case 11 and the first insulating member 3 according to other embodiments of the present application, fig. 17 is a schematic structural diagram of the case 11 shown in fig. 16, or two first wall portions 1121 in the case 11 are formed with the solder pad 111.

It is understood that there are two lands 111 in the housing 11, and the two lands 111 are located on the two first wall portions 1121, respectively. In the embodiment in which the first insulating member 3 includes the first insulating portion 32 and the second insulating portion 33, and the first thickened region 31 is formed by the first overlapping region of the first insulating portion 32 and the second insulating portion 33, the first insulating member 3 may include two sheets, the two sheets are disposed on the outer surface of the housing 11, two ends of one sheet are both the first insulating portion 32, and two ends of the other sheet are both the second insulating portion 33. A first insulating portion 32 of one sheet and a second insulating portion 33 of the other sheet have a first overlap region covering the solder pad 111 on a first wall portion 1121; the other first insulating portion 32 of one sheet and the other second insulating portion 33 of the other sheet have another first overlapping region that covers the solder land 111 on the other first wall portion 1121.

Referring to fig. 18, fig. 18 is an isometric view of a housing 11 according to some embodiments of the present application. In some embodiments, the battery cell 10 further includes a pressure relief mechanism 6, the pressure relief mechanism 6 and the weld area 111 being located on two walls 112, respectively.

The pressure release mechanism 6 is a member for releasing the internal pressure of the battery cell 10. When the internal pressure of the battery cell 10 reaches the threshold value, the internal pressure of the battery cell 10 is released through the pressure release mechanism 6.

The wall 112 where the pressure release mechanism 6 is located and the wall 112 where the welding area 111 is located may be two adjacent wall 112, and the two wall 112 may be connected by other wall 112.

The pressure release mechanism 6 and the housing 11 may be of an integral structure, for example, a wall 112 of the housing 11 is provided with a score groove, and a region of the wall 112 where the score groove is provided corresponds to the pressure release mechanism 6. The score groove may be a variety of shaped grooves, such as a straight line groove, a circular groove, an elliptical groove, an annular groove, a circular arc groove, a U-shaped groove, an H-shaped groove, etc. Here, the circular groove means a groove having a circular cross section, and the elliptical groove means a groove having an elliptical cross section, which is perpendicular to the thickness direction of the wall portion 112 provided with the score groove. As an example, in fig. 18, the score groove is an annular groove.

The pressure release mechanism 6 and the housing 11 may be of a split type. The pressure release mechanism 6 and the shell 11 are two independent components, and the two components are installed together after being formed independently. The pressure release mechanism 6 may be an explosion-proof valve, an explosion-proof sheet, or the like. The pressure release mechanism 6 may be attached to the wall 112 of the housing 11 by means of adhesion, welding or the like.

In this embodiment, the pressure release mechanism 6 and the welding area 111 are respectively located on two wall portions 112, and the pressure release mechanism 6 and the welding area 111 are not arranged on the same wall portion 112, so that the influence on the pressure release mechanism 6 in the process of welding the shell 11 to form the welding area 111 is reduced, and the reliability of the pressure release mechanism 6 is improved.

In some embodiments, please continue to refer to fig. 18, the plurality of wall portions 112 includes two opposite first wall portions 1121, and the pressure release mechanism 6 and the solder pad 111 are respectively located on the two first wall portions 1121.

The two first wall portions 1121 are opposite wall portions 112 in the housing 11.

As an example, the plurality of wall portions further includes two opposing second wall portions 1122, the first wall portion 1121 and the second wall portion 1122 being connected by one corner portion. The two first wall portions 1121 are disposed opposite to each other in the first direction X, the two second wall portions 1122 are disposed opposite to each other in the second direction Y, and the first wall portions 1121 are perpendicular to the second wall portions 1122. The distance between the two first wall portions 1121 is greater than the distance between the two second wall portions 1122 in the first direction X.

In the present embodiment, the pressure relief mechanism 6 and the land 111 are located at the two first wall portions 1121, respectively, so that the pressure relief mechanism 6 and the land 111 are further apart in the circumferential direction of the housing 11, further reducing the influence on the pressure relief mechanism 6 during the welding of the housing 11 to form the land 111.

In some embodiments, referring to fig. 19-21, fig. 19 is a schematic structural diagram of a battery cell 10 according to some embodiments of the present application; FIG. 20 is an enlarged view of a portion of FIG. 19 at D; fig. 21 is a partial enlarged view at E in fig. 20. The battery cell 10 further includes an electrode assembly 2 and a second insulating member 4. The electrode assembly 2 is disposed within the case 11. The second insulator 4 is disposed between the electrode assembly 2 and the case 11, and the second insulator 4 is configured to insulate the electrode assembly 2 from the case 11.

Wherein the second insulating member 4 has a second thickened region 41, and the second thickened region 41 covers at least a part of the solder land 111.

The second insulating member 4 is an insulating member provided between the electrode assembly 2 and the case 11, and is made of an insulating material, such as rubber or plastic.

The second insulating member 4 may be an integrally formed insulating sleeve structure; the second insulating member 4 may also be formed of a sheet body surrounding the electrode assembly 2. The second insulating member 4 may be formed by connecting end portions of a sheet body to each other; the second insulating member 4 may be formed of a plurality of sheets, which are separately provided, and two connected sheets are connected to each other.

The second thickened region 41 is a region of partial thickening on the second insulating member 4. It is possible to form the second insulation 4 locally with a bulge to form a second thickened region 41; it is also possible that the two parts of the second insulation 4 overlap each other so that the overlapping area is thicker to form the second thickened area 41.

The second thickened regions 41 may be in one-to-one correspondence with the solder lands 111, or one first thickened region 31 may be in correspondence with a plurality of solder lands 111. The second thickened region 41 covers at least a part of the solder land 111, and the projection of the solder land 111 in the wall thickness direction of the housing 11 is at least partially located in the second thickened region 41. The second thickened region 41 may completely cover the solder print region 111, i.e. the projection of the solder print region 111 in the wall thickness direction of the housing 11 is entirely located within the second thickened region 41; the second thickened region 41 may also cover a part of the solder land 111, i.e. a part of the projection of the solder land 111 in the wall thickness direction of the housing 11 is located in the second thickened region 41. The second thickened region 41 may be in contact with the solder land 111 or may be disposed in a gap. As an example, in fig. 21, the second thickened region 41 is disposed in a gap with the solder land 111 so that the solder land 111 is more difficult to pierce the second insulating member 4. Taking the case 11 as an example having two opposite first wall portions 1121, one first wall portion 1121 is located at the bottom of the electrode assembly 2 to support the electrode assembly 2, and the other wall portion 112 is located at the top of the electrode assembly 2 and is formed with the welding region 111, such that the second thickened region 41 of the second insulating member 4 is disposed in a gap with the welding region 111 under the action of gravity of the electrode assembly 2.

The second insulating member 4 is located between the electrode assembly 2 and the case 11, and serves to separate the electrode assembly 2 and the case 11, so as to insulate the electrode assembly 2 from the case 11. The second thickened region 41 of the second insulating member 4 covers at least a portion of the solder print region 111, which reduces the risk of the solder print region 111 piercing the second insulating member 4 and causing insulation failure of the electrode assembly 2 from the case 11.

In some embodiments, please continue to refer to fig. 20 and 21, the second insulating member 4 includes a third insulating portion 42 and a fourth insulating portion 43, the third insulating portion 42 and the fourth insulating portion 43 have a third overlapping region, and the third overlapping region forms the second thickened region 41.

The second insulating member 4 may be formed by a single piece around the housing 11, and the third insulating portion 42 and the fourth insulating portion 43 are two integrally formed portions of the second insulating member 4. The third insulating portion 42 and the fourth insulating portion 43 may be separately provided and connected, for example, the second insulating member 4 may be formed of a plurality of separately provided sheets, the plurality of sheets being provided around the housing 11, two adjacent sheets being connected to each other, all or part of one sheet forming the third insulating portion 42 and all or part of the other sheet forming the fourth insulating portion 43, and the third insulating portion 42 and the fourth insulating portion 43 forming a third overlapping region. Of course, the number of sheets in the second insulating member 4 may be two, three, four or more.

The portion where the third insulating portion 42 and the fourth insulating portion 43 overlap each other is the second thickened region 41, and it is understood that a portion of the second thickened region 41 is located in the third insulating portion 42, and another portion of the second thickened region 41 is located in the fourth insulating portion 43. In the second thickened region 41, the third insulating portion 42 and the fourth insulating portion 43 may be connected by various means, such as bonding, heat fusion, or the like. The thickness of the third insulating portion 42 may be equal to or different from the thickness of the fourth insulating portion 43.

The third overlapping region is formed by overlapping the third insulating portion 42 and the fourth insulating portion 43 with each other, so that the second insulating member 4 is locally thickened to correspondingly form the second thickened region 41, and the forming direction of the second thickened region 41 is simple. It will be appreciated that the second insulating member 4 has a two-layer insulating portion in the third overlapping region, which is not double-layered, and taking an example in which the third insulating portion 42 is located on the side of the fourth insulating portion 43 facing the electrode assembly 2 in the third overlapping region, even if the solder print region 111 pierces the fourth insulating portion 43, the third insulating portion 42 is not easily pierced, and the third insulating portion 42 can still perform good insulation protection, thereby achieving a reduced risk of the solder print region 111 piercing the second insulating member 4.

In some embodiments, referring to fig. 19-21, the second insulating member 4 is coated on the outer surface of the electrode assembly 2 along the circumferential direction of the case 11, and the two ends of the second insulating member 4 form a third insulating portion 42 and a fourth insulating portion 43, respectively, along the circumferential direction of the case 11.

The circumferential direction of the case 11 coincides with the circumferential direction of the electrode assembly 2.

In the present embodiment, the second insulating member 4 may be formed by a single piece disposed around the housing 11 in the circumferential direction of the housing 11. The third insulating portion 42 and the fourth insulating portion 43 are both ends of the second insulator 4The two ends of the second insulating element 4 form a third overlap region, as will be appreciated. The second insulating member 4 extends from the end face of one end in the forward direction of the circumferential direction of the housing 11 by a fifth preset distance L ₅ The portion in the region of (2) is one end of the second insulating member 4, the length of which is equal to the fifth preset distance L ₅ The method comprises the steps of carrying out a first treatment on the surface of the The second insulating member 4 extends from the end face of the other end in the opposite direction of the circumferential direction of the housing 11 by a sixth preset distance L ₆ The portion in the region of (2) is the other end of the second insulating member 4, the length of which is equal to the sixth preset distance L ₆ . A first preset distance L ₅ From a second preset distance L ₆ May be equal or different. As an example, the land 111 is located at the first wall portion 1121 of the case 11, the third insulating portion 42 and the fourth insulating portion 43 are disposed opposite to the first wall portion 1121, and a gap is formed between each of the third wall portion 112 and the fourth wall portion 112 and the first wall portion 1121.

In the present embodiment, the second insulating member 4 is coated on the outer surface of the electrode assembly 2 along the circumferential direction of the case 11, so that more area of the outer surface of the electrode assembly 2 can be rapidly covered, thereby improving the insulating performance between the electrode assembly 2 and the case 11. The second insulating member 4 is coated on the outer surface of the electrode assembly 2 in the circumferential direction of the case 11, and both end portions of the second insulating member 4 are overlapped with each other, so that the second thickened region 41 can be formed, and the second thickened region 41 can be formed in a simple manner.

In some embodiments, referring to fig. 21, the second thickened region 41 completely covers the solder pad 111.

It will be appreciated that the projection of the weld zone 111 in the wall thickness direction of the housing 11 is entirely within the second thickened zone 41.

In the present embodiment, the second thickened region 41 completely covers the second protrusion 1112, so as to increase the overlapping area of the second thickened region 41 and the solder land 111, and further reduce the risk of the solder land 111 piercing the second insulating member 4.

In some embodiments, referring to fig. 21, the solder pad 111 includes a second protrusion 1112 protruding from the inner surface of the housing 11, where the height of the second protrusion 1112 protruding from the inner surface of the housing 11 is H ₂ The second thickened region 41 has a thickness D ₂ ，H ₂ ＜D ₂ 。

The second protrusions 1112 are portions of the solder lands 111 protruding from the inner surface of the housing 11, and the second protrusions 1112 may be solder or slag formed during the soldering process of the housing 11, or the second protrusions 1112 may be portions of the solder lands protruding from the outer surface of the housing 11 after fusion.

The height direction of the second protrusions 1112 and the thickness direction of the second thickened region 41 are the same as the thickness direction of the first wall 1121. Taking the third insulating portion 42 and the fourth insulating portion 43 of the second insulating member 4 as an example to form the third overlapped region and correspondingly form the second thickened region 41, the total thickness of the third insulating portion 42 and the fourth insulating portion 43 is the thickness D of the second thickened region 41 ₂ 。

In the present embodiment, H ₂ ＜D ₂ Even if the second protrusions 1112 completely penetrate into the second thickened region 41, it is difficult to pierce the second thickened region 41, further reducing the risk of insulation failure between the electrode assembly 2 and the case 11.

In some embodiments, referring to fig. 22, fig. 22 is an isometric view of a housing 11 according to still other embodiments of the present application. The housing 11 is a rectangular parallelepiped housing. The case 11 is suitable for the rectangular parallelepiped battery cell 10, and can satisfy the large capacity requirement of the battery cell 10.

In some embodiments, openings are formed at opposite ends of the housing 11 along the length of the housing 11. The length of the shell 11 is a, the width of the shell 11 is b, the height of the shell 11 is c, and b is less than or equal to c and less than or equal to a/1.5.

It will be appreciated that a/c is ≡1.5, and a/c may be any one point value or range value between any two of 1.5, 2, 3, 4, 5, etc. B < c or b=c. In the embodiment shown in fig. 22, b < c.

As an example, the case 11 includes two first wall portions 1121 and second wall portions 1122, the first wall portions 1121 and the second wall portions 1122 are connected by one corner portion 113, the two first wall portions 1121 are disposed opposite to each other in the first direction X, the solder lands 111 are formed in one first wall portion 1121 of the two first wall portions 1121, the two second wall portions 1122 are disposed opposite to each other in the second direction Y, the two openings of the case 11 are disposed opposite to each other in the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X may be the height direction of the housing 11, the second direction Y may be the width direction of the housing 11, and the third direction Z may be the length direction of the housing 11.

The housing 11 is elongated, which is advantageous for improving the energy density of the battery cell 10. In the embodiment in which the housing 11 is formed by bending a plate material and the two end portions of the plate material are welded to form the weld zone 111, the housing 11 is formed by bending the plate material more easily than the conventional stamping or pulling-up housing 11, and the molding efficiency and the yield are higher, especially the thin-walled housing 11 having a wall thickness of not more than 0.6 mm.

In some embodiments, referring to fig. 4, opposite ends of the housing 11 are formed with openings. The battery cell 10 further includes an end cap 12, the end cap 12 being in one-to-one correspondence with the openings, the end cap 12 closing the openings.

The two openings are oppositely arranged in a third direction Z, the circumference of the housing 11 being arranged around a centre line, which extends in the third direction Z.

The end cap 12 is illustratively provided with electrode terminals 5. In the battery cell 10, one end cap 12 is provided with a positive electrode terminal, and the other end cap 12 is provided with a negative electrode terminal. The electrode assembly 2 has a positive tab and a negative tab, which are formed at opposite ends of the electrode assembly 2 in the third direction Z, the positive tab being electrically connected to the positive electrode terminal, and the negative tab being electrically connected to the negative electrode terminal.

When the battery cell 10 is assembled, the electrode assembly 2 can enter the case 11 from the opening at either end of the case 11, and the assembly efficiency of the battery cell 10 can be effectively improved.

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

The embodiment of the application provides electric equipment, which comprises the battery cell 10 provided by any one of the embodiments, wherein the battery cell 10 is used for providing electric energy.

An embodiment of the present application provides a battery cell 10 including a case 11, an end cap 12, an electrode assembly 2, a first insulating member 3, and a second insulating member 4. Shell and shellThe body 11 is a rectangular parallelepiped housing, the housing 11 includes two first wall portions 1121 and two second wall portions 1122, the first wall portions 1121 and the second wall portions 1122 are connected by a corner portion 113, the two first wall portions 1121 are oppositely disposed along a first direction X, the two second wall portions 1122 are oppositely disposed along a second direction Y, the second wall portions 1122 are wall portions 112 with the largest surface area in the housing 11, the housing 11 has two openings oppositely disposed along a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The housing 11 is formed by bending a plate material, and the plate material comprises a first end 11211 and a second end 11212 along the circumferential direction of the housing 11, wherein the first end 11211 and the second end 11212 are welded to form a welding zone 111, and the welding zone 111 comprises a first protrusion 1111 protruding from the outer surface of the housing 11 and a second protrusion 1112 protruding from the inner surface of the housing 11. The number of the end caps 12 is two, the two end caps 12 respectively close the two openings of the case 11, one end cap 12 is provided with a positive electrode terminal, and the other end cap 12 is provided with a negative electrode terminal. The electrode assembly 2 is disposed in the case 11, and positive and negative tabs are formed at both ends of the electrode assembly 2 in the third direction Z, respectively, the positive tab being electrically connected with the positive electrode terminal, and the negative tab being electrically connected with the negative electrode terminal. The first insulating member 3 is wrapped on the outer surface of the housing 11 along the circumferential direction of the housing 11, and the two ends of the first insulating member 3 are provided with first overlapping areas along the circumferential direction of the housing 11, wherein the first overlapping areas form a first thickened area 31 of the first insulating member 3, and the first thickened area 31 completely covers the welding area 111. The width of the first thickened region 31 is W in the circumferential direction of the housing 11 ₁ ，W ₁ Not less than 3mm, the width of the first projection 1111 is W ₂ ，W ₁ -W ₂ And is more than or equal to 1mm. The first projection 1111 projects from the outer surface of the housing 11 by a height H ₁ The first thickened region 31 has a thickness D ₁ ，H ₁ ＜D ₁ . The second insulating member 4 is coated on the outer surface of the electrode assembly 2 along the circumferential direction of the case 11, and the second insulating member 4 has second overlapping regions 11215 at both ends along the circumferential direction of the case 11, the second overlapping regions 11215 forming second thickened regions 41 of the second insulating member 4, the second thickened regions 41 completely covering the solder pad regions 111. The second protrusions 1112 protrude from the inner surface of the housing 11 by a height H ₂ The second thickened region 41 has a thickness D ₂ ，H ₂ ＜D ₂ 。

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

The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing having a solder pad;

the first insulating piece is arranged on the outer surface of the shell and is provided with a first thickening area, and at least one part of the welding area is covered by the first thickening area.

2. The battery cell of claim 1, wherein the first insulator comprises a first insulator and a second insulator, the first insulator and the second insulator being disposed on an outer surface of the housing, the first insulator and the second insulator having a first overlap region, the first overlap region forming the first thickened region.

3. The battery cell as defined in claim 2, wherein the first insulating member is coated on the outer surface of the case in the circumferential direction of the case, and both end portions of the first insulating member form the first insulating portion and the second insulating portion, respectively, in the circumferential direction of the case.

4. The battery cell of claim 2, wherein the housing includes a first wall portion, the weld region is located on the first wall portion, and the first insulating portion and the second insulating portion collectively cover an outer surface of the first wall portion.

5. The battery cell of claim 1, wherein the first thickened region completely covers the solder pad.

6. The battery cell of claim 1, wherein the first thickened region has a width W along a circumferential direction of the housing ₁ The width of the welding area is W ₂ ，W ₁ ＞W ₂ 。

7. The battery cell of claim 6, wherein W ₁ -W ₂ ≥1mm。

8. The battery cell of claim 6, wherein W ₁ ≥3mm。

9. The battery cell of any one of claims 1-8, wherein the solder pad comprises a first protrusion protruding from an outer surface of the housing, the first protrusion protruding from the outer surface of the housing by a height H ₁ The thickness of the first thickening area is D ₁ ，H ₁ ＜D ₁ 。

10. The battery cell of any one of claims 1-8, wherein the housing is formed from a sheet of material that includes a first end and a second end in a circumferential direction of the housing, the first end and the second end being welded together to form the weld zone.

11. The battery cell of claim 10, wherein an end face of the first end portion and an end face of the second end portion are welded together.

12. The battery cell of claim 10, wherein the first end and the second end have a second overlap region, and the weld region is located in the second overlap region.

13. The battery cell of any one of claims 1-8, wherein the housing comprises a plurality of wall portions and a plurality of corner portions, each of the corner portions connecting adjacent two wall portions in a circumferential direction of the housing;

Wherein the solder pad is located at the wall portion.

14. The battery cell of claim 13, wherein the plurality of walls includes a first wall and a second wall, the first wall and the second wall being connected by one of the corner portions, the second wall being a wall of the housing having a largest outer surface area, the weld zone being located in the first wall.

15. The battery cell of claim 14, wherein the plurality of wall portions includes two of the first wall portions and two of the second wall portions, the two first wall portions being disposed opposite one another in a first direction, the two second wall portions being disposed opposite one another in a second direction, the first direction being perpendicular to the second direction;

wherein at least one of the first wall portions is formed with the land.

16. The battery cell of claim 13, further comprising a pressure relief mechanism, wherein the pressure relief mechanism and the weld are located on two of the wall portions, respectively.

17. The battery cell of claim 16, wherein the plurality of wall portions includes two opposing first wall portions, the pressure relief mechanism and the solder mask being positioned on the two first wall portions, respectively.

18. The battery cell of any one of claims 1-8, wherein the battery cell further comprises:

an electrode assembly disposed within the housing;

a second insulator disposed between the electrode assembly and the case, the second insulator configured to insulate the electrode assembly from the case;

wherein the second insulator has a second thickened region that covers at least a portion of the solder pad.

19. The battery cell of claim 18, wherein the second insulator comprises a third insulator and a fourth insulator, the third insulator and the fourth insulator having a third overlap region, the third overlap region forming the second thickened region.

20. The battery cell as defined in claim 19, wherein the second insulating member is coated on the outer surface of the electrode assembly in the circumferential direction of the case, and both end portions of the second insulating member form the third insulating portion and the fourth insulating portion, respectively, in the circumferential direction of the case.

21. The battery cell of claim 18, wherein the second thickened region completely covers the solder pad.

22. The battery cell of claim 18, wherein the weld zone includes a second protrusion protruding from the interior surface of the housing, the second protrusion protruding from the interior surface of the housing by a height H ₂ The thickness of the second thickening area is D ₂ ，H ₂ ＜D ₂ 。

23. The battery cell of any one of claims 1-8, wherein the housing is a rectangular parallelepiped housing.

24. The battery cell of claim 23, wherein the housing defines openings at opposite ends along a length of the housing;

the length of the shell is a, the width of the shell is b, the height of the shell is c, and b is not less than c and not more than a/1.5.

25. The battery cell of any one of claims 1-8, wherein opposite ends of the housing form openings;

the battery cell also comprises end covers, wherein the end covers correspond to the openings one by one, and the end covers seal the openings.

26. A battery comprising a cell according to any one of claims 1-25.

27. A powered device comprising a battery cell as claimed in any one of claims 1 to 25, the battery cell being configured to provide electrical energy.