Battery monomer, battery and electric device

Abstract

The utility model provides a single battery, a battery and a power utilization device, the single battery comprises a shell, an electrode terminal, an electrode assembly and an insulating part, the electrode terminal is arranged on the wall part of the shell, the electrode assembly is accommodated in the shell, a first tab of the electrode assembly is electrically connected to the electrode terminal, a first insulating part of the insulating part surrounds the outer side of the first tab, and a second tab of the insulating part is electrically connected to the first tab. The second insulating portion is connected to the first insulating portion and is located between the wall portion and the first tab. According to the structure, the first insulating part of the insulating part surrounds the outer side of the first tab, and the second insulating part is positioned between the wall part and the first tab, so that the insulating part can insulate and isolate the first tab from the shell, insulating treatment procedures such as pasting insulating glue on the first tab are reduced, and the production efficiency of the battery monomer is improved.

Description

Technical Field

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

[0002] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric tools, etc.

[0003] As the application scope of batteries continues to expand, how to improve the production efficiency of batteries has always been the focus of technical personnel in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, wherein the battery cell has high production efficiency.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode terminal, an electrode assembly and an insulating member, wherein the shell includes a wall portion; the electrode terminal is arranged on the wall portion; the electrode assembly is accommodated in the shell, and the electrode assembly includes a first pole ear, which is electrically connected to the electrode terminal; the insulating member includes a first insulating portion and a second insulating portion, the first insulating portion surrounds the outside of the first pole ear, and the second insulating portion is connected to the first insulating portion and is located between the wall portion and the first pole ear.

[0006] In the above structure, since the first insulating portion of the insulating member surrounds the outside of the first pole lug and the second insulating portion is located between the wall portion and the first pole lug, the insulating member can insulate the first pole lug from the shell, reducing the insulation treatment steps such as sticking insulating glue to the first pole lug, which is beneficial to improving the production efficiency of the battery cell.

[0007] According to the battery cell provided in some embodiments of the present application, a notch is provided on the end face of the first insulating part facing away from the second insulating part, and the notch penetrates the first insulating part along the thickness direction of the first insulating part, so that when the first pole ear extends into the space enclosed by the first insulating part, the first insulating part can open at the notch, and the opening of the first insulating part facing away from the second insulating part can be enlarged, so that the first pole ear can be more easily inserted into the space enclosed by the first insulating part, which is beneficial to improving the convenience of assembling the battery cell.

[0008] According to the battery cell provided in some embodiments of the present application, the first insulating part is provided with a plurality of notches, which are arranged along the circumference of the first insulating part, so that the opening of the first insulating part away from the second insulating part can be uniformly increased, which is beneficial to improving the smoothness of the first pole ear during the insertion process.

[0009] According to the battery cells provided in some embodiments of the present application, along the direction from the first insulating portion to the electrode assembly, the width of the notch in the circumferential direction of the first electrode tab gradually increases, which facilitates the opening of the second insulating portion.

[0010] According to the battery cell provided in some embodiments of the present application, the battery cell also includes a current collecting member connected to the first pole ear, the first insulating portion encloses a containing inner cavity, the current collecting member is located in the containing inner cavity, and at least a portion of the current collecting member is located between the second insulating portion and the first pole ear; a through hole communicating with the containing inner cavity is formed on the second insulating portion, and the current collecting member is connected to the electrode terminal through the through hole.

[0011] According to the battery cell provided in some embodiments of the present application, along the thickness direction of the wall, the size of the first insulating portion is H1, the thickness of the current collector is H3, the size of the notch is H4, H4≤H1-H3, so that the current collector can be completely surrounded by the first insulating portion in its circumferential direction, and the current collector is not likely to leak electricity to the shell through the notch, which is beneficial to improving the reliability of the battery cell.

[0012] According to the battery cell provided in some embodiments of the present application, the electrode assembly also includes a stacked pole piece and an isolating member, the first pole tab is connected to the pole piece and extends out of the isolating member; along the thickness direction of the wall portion, the size of the first insulating portion is H1, the size of the first pole tab extending out of the isolating member is H2, the thickness of the current collecting member is H3, H1≥H2+H3, so that the current collecting member and the portion of the first pole tab extending out of the isolating member can be completely located in the accommodating space surrounded by the first insulating portion, so that the first insulating portion can surround the current collecting member and the portion of the first pole tab extending out of the isolating member, thereby reducing the leakage of the current collecting member and the portion of the first pole tab extending out of the isolating member to the shell, which is beneficial to improving the reliability of the battery cell.

[0013] According to the battery cell provided in some embodiments of the present application, the first pole ear is a columnar body, the length of the first pole ear along the winding direction is L1, the length of the pole piece along the winding direction is L2, L1 / L2≥50%, so that the length of the first pole ear in the winding direction is sufficient, which is beneficial to improve the current carrying capacity of the first pole ear.

[0014] According to the battery cell provided in some embodiments of the present application, the battery cell also includes a current collector connected to the first pole ear, the first insulating part encloses to form a receiving inner cavity, the current collector is located in the receiving inner cavity, and at least part of the current collector is located between the second insulating part and the first pole ear; a through hole connected to the receiving inner cavity is formed on the second insulating part, and the current collector is connected to the electrode terminal through the through hole; the battery cell also includes an insulating structure, the insulating structure is arranged on the surface of the wall facing the electrode assembly, and at least part of the insulating structure is located between the wall and the second insulating part. By making at least part of the insulating structure located between the wall and the second insulating part, the wall can press or block the second insulating part through the insulating structure, which is conducive to improving the stability of the insulating part installed on the electrode assembly.

[0015] According to the battery cells provided in some embodiments of the present application, along the direction from the first insulating portion to the first pole ear, at least a portion of the insulating structure extends out of the inner wall surface of the through hole to insulate the current collecting part from the wall portion, so that at least a portion of the insulating structure can cover the through hole and insulate the insulating part located in the accommodating inner cavity from the wall portion.

[0016] According to the battery cells provided in some embodiments of the present application, at least a portion of the insulating structure extending out from the inner wall of the through hole abuts against the current collector to squeeze the first pole ear, so that the current collector can squeeze the first pole ear under the action of the insulating structure, so that the first pole ear is in a compressed state, so that the first pole ear can be stably connected to the current collector under the action of its own elastic restoring force.

[0017] According to the battery cells provided in some embodiments of the present application, at least a portion of the insulating structure is sandwiched between the wall portion and the second insulating portion, so that the insulating structure can push the insulating member to stably cover the end of the electrode assembly, reducing the possibility of the insulating member falling off the electrode assembly.

[0018] According to the battery cells provided in some embodiments of the present application, along the thickness direction of the wall, the overlapping area between the projection of the insulating structure and the projection of the second insulating portion is annular, and the width of the overlapping area in the radial direction of the first pole ear is D, D≥0.8mm, so that the overlapping area has a sufficient width to ensure stable pressing or blocking of the second insulating portion by the insulating structure.

[0019] According to the battery cells provided in some embodiments of the present application, the wall thickness of the second insulating portion is T1 along the thickness direction of the wall, 0.05mm≤T1≤4mm, so that the second insulating portion has sufficient thickness to improve the structural strength of the insulating member, and the second insulating portion is not prone to material waste due to excessive thickness.

[0020] According to the battery cell provided in some embodiments of the present application, the first insulating portion encloses a containing inner cavity, and at least a portion of the first pole lug is contained in the containing inner cavity; along the direction from the first pole lug to the first insulating portion, the radial dimension of at least a portion of the containing inner cavity is reduced in the first pole lug, so that the current collector and the first pole lug can be conveniently inserted into the containing inner cavity away from the opening of the second insulating portion.

[0021] According to the battery cells provided in some embodiments of the present application, the thickness of the end region of the first insulating part away from the second insulating part is smaller than the thickness of the end region of the first insulating part close to the second insulating part, so that the first insulating part changes the radial dimension of the accommodating inner cavity by changing its own wall thickness, so that the current collector and the first pole ear can be easily inserted from the opening of the accommodating inner cavity away from the second insulating part.

[0022] According to the battery cells provided in some embodiments of the present application, the thickness of at least part of the first insulating portion gradually increases along the direction from the first pole ear to the first insulating portion, so that the thickness of the first insulating portion changes continuously, which is beneficial to reducing the possibility of stress concentration on the first insulating portion.

[0023] According to the battery cell provided in some embodiments of the present application, the electrode assembly further includes a second pole tab having a polarity opposite to that of the first pole tab, and the second pole tab is electrically connected to the housing.

[0024] According to the battery cell provided in some embodiments of the present application, the outer shell includes a shell and an end cover, the shell includes an end wall and a side wall, the side wall is arranged around the outer periphery of the end wall, one end of the side wall is connected to the end wall, and the other end forms an opening opposite to the end wall, the end cover covers the opening, and the wall portion is the end wall or the end cover.

[0025] In a second aspect, some embodiments of the present application further provide a battery, which includes the battery cell provided by the aforementioned technical solution.

[0026] In a third aspect, some embodiments of the present application further provide an electrical device, which includes the battery provided by the aforementioned technical solution, and the battery is used to provide electrical energy.

[0027] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0028] Some embodiments of the present application provide a battery cell, which includes a shell, an electrode terminal, an electrode assembly, and an insulating member, wherein the electrode terminal is disposed on the wall of the shell, the electrode assembly is contained in the shell, a first pole tab of the electrode assembly is electrically connected to the electrode terminal, a first insulating portion of the insulating member surrounds the outside of the first pole tab, and a second insulating portion is connected to the first insulating portion and is located between the wall and the first pole tab. In the above structure, since the first insulating portion of the insulating member surrounds the outside of the first pole tab, and the second insulating portion is located between the wall and the first pole tab, the insulating member can insulate and isolate the first pole tab from the shell, reducing the insulation treatment process such as attaching insulating glue to the first pole tab, which is conducive to improving the production efficiency of the battery cell.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0031] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0032] Figure 2 An exploded view of a battery provided in some embodiments of the present application;

[0033] Figure 3 A schematic diagram of the internal structure of a battery cell provided in some embodiments of the present application;

[0034] Figure 4 A schematic diagram of disassembling a battery cell provided in some embodiments of the present application;

[0035] Figure 5 A top view of a battery cell provided in some embodiments of the present application;

[0036] Figure 6 for Figure 5 Sectional view at AA in the middle;

[0037] Figure 7 A front view of an insulating member of a battery cell provided in some embodiments of the present application;

[0038] Figure 8 A top view of an insulating member of a battery cell provided in some embodiments of the present application;

[0039] Fig. 9 for Figure 8 CC is a cross-sectional view in some embodiments;

[0040] Fig.10 for Figure 8 CC is a cross-sectional view in other embodiments;

[0041] Fig.11 A front view of an insulating member of a battery cell provided in some other embodiments of the present application;

[0042] Fig.12 for Figure 6 Enlarged view of point B in the middle.

[0043] In the attached picture:

[0044] 1. Shell; 11. Wall; 12. Shell; 121. End wall; 122. Side wall; 13. End cap; 2. Electrode terminal; 3. Electrode assembly; 32. First pole ear; 33. Second pole ear; 34. Isolator; 35. Pole piece; 4. Insulator; 41. First insulating portion; 411. Notch; 412. Accommodating inner cavity; 42. Second insulating portion; 421. Through hole; 5. Current collector; 6. Insulating structure; 10. Case; 101. First case; 102. Second case; 20. Battery cell; 1000. Vehicle; 100. Battery; 200. Controller; 300. Motor. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0047] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0051] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0052] The term "plurality" used in the present application refers to two or more (including two).

[0053] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0054] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0055] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0056] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode.

[0057] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting while allowing active ions to pass through.

[0058] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0059] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector.

[0060] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, silver-surface-treated aluminum, silver-surface-treated stainless steel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] As an example, the positive electrode active material layer includes a positive electrode active material. 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 traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、L i Mn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、L iNi 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 )、Li Ni 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as Li Ni 0.80 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0062] In some embodiments, the positive electrode may be carbon foam or metal foam. The metal foam may be nickel foam, copper foam, aluminum foam or alloy foam. When the metal foam is used as the positive electrode, the positive electrode active material may not be provided on the surface of the metal foam, but the positive electrode active material may also be provided. As an example, lithium source material, potassium metal or sodium metal may be filled or / and deposited in the metal foam, and the lithium source material is lithium metal and / or lithium-rich material.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0064] As an example, the negative electrode current collector may be a metal foil, a foamed metal, a foamed carbon or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, silver-surface-treated aluminum, silver-surface-treated stainless steel, a carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum or a foamed alloy, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0066] In some embodiments, the negative electrode may be foamed carbon or foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum or foamed alloy, etc. When the foamed metal is used as the negative electrode sheet, the surface of the foamed metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0067] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0068] 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.

[0069] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0070] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0071] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0072] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0073] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0074] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0075] In some embodiments, the electrolyte salt can 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0076] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0077] The gel electrolyte includes a polymer-based electrolyte skeleton network combined with an ionic liquid-lithium salt.

[0078] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0079] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0080] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous Li PON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0081] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0082] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0083] In some embodiments, the electrode assembly is a laminate structure.

[0084] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0085] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0086] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0087] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0088] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0089] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0090] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0091] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0092] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0093] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0094] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0095] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0096] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0097] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0098] At present, in order to achieve insulation between the shell and the electrode assembly, the electrode assembly in the prior art is usually wrapped with insulating glue on the periphery of the tab, which not only reduces the production efficiency of the battery cell, but also affects the yield rate of the battery cell due to poor winding of the insulating glue.

[0099] In order to improve the production efficiency of battery cells, some embodiments of the present application provide a battery cell, which includes a shell, an electrode terminal, an electrode assembly and an insulating member, wherein the electrode terminal is arranged on the wall of the shell, the electrode assembly is accommodated in the shell, the first pole tab of the electrode assembly is electrically connected to the electrode terminal, the first insulating portion of the insulating member surrounds the outside of the first pole tab, and the second insulating portion is connected to the first insulating portion and is located between the wall and the first pole tab. In the above structure, since the first insulating portion of the insulating member surrounds the outside of the first pole tab and the second insulating portion is located between the wall and the first pole tab, the insulating member can insulate and isolate the first pole tab from the shell, reducing the insulation treatment process such as applying insulating glue to the first pole tab, which is conducive to improving the production efficiency of the battery cell.

[0100] The battery cell described in the embodiments of the present application is suitable for use in batteries and electrical devices using batteries. The battery cell can be used for, but is not limited to, batteries, and can also be used for vehicles, aircraft, ships, electronic equipment, power tools and other products, and can improve the reliability of these products.

[0101] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0102] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0103] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0104] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0105] Please refer to Figure 2 , Figure 2An exploded diagram of a battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 20. There may be multiple battery cells 20 in the battery 100, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the housing 10; of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the housing 10.

[0106] The box 10 may include a first box 101 and a second box 102, and the first box 101 and the second box 102 cover each other to define a placement space for accommodating the battery cells 20. The first box 101 and the second box 102 may be in various shapes, such as a cuboid, a cylinder, etc. The first box 101 may be a hollow structure with one side open, and the second box 102 may also be a hollow structure with one side open, and the open side of the second box 102 covers the open side of the first box 101, thereby forming a box 10 with a placement space.

[0107] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0108] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0109] In some embodiments of the present application, Figure 3 As shown, the battery cell 20 includes a housing 1 and an electrode assembly 3, and the electrode assembly 3 is accommodated in the housing 1. The housing 1 can be a wall structure arranged on the periphery of the battery cell 20, which can form a cavity for accommodating other components of the battery cell 20 such as the electrode assembly 3 and the electrolyte. The electrode assembly 3, as a component accommodated in the housing 1, is in contact with the electrolyte, and active ions (such as lithium ions) can be conducted between the electrode assembly 3 and the electrolyte.

[0110] The housing 1 comprises an end cover and a shell, the shell has an opening, and the end cover covers the opening.

[0111] In some embodiments of the present application, continue to refer to Figures 4 to 6As shown, some embodiments of the present application provide a battery cell 20, the battery cell 20 includes a housing 1, an electrode terminal 2, an electrode assembly 3 and an insulating member 4, the housing 1 includes a wall portion 11; the electrode terminal 2 is disposed on the wall portion 11; the electrode assembly 3 is accommodated in the housing 1, and the electrode assembly 3 includes a first pole ear 32, and the first pole ear 32 is electrically connected to the electrode terminal 2. Figure 7 and Figure 8 The insulating member 4 includes a first insulating portion 41 and a second insulating portion 42. Figure 7 The first insulating portion 41 surrounds the outside of the first pole tab 32 , and the second insulating portion 42 is connected to the first insulating portion 41 and is located between the wall portion 11 and the first pole tab 32 .

[0112] In the embodiment of the present application, the housing 1 of the battery cell 20 may include an end cap 13 and a shell 12, which are sealed and connected to form a storage space for accommodating components such as the electrode assembly 3. Exemplarily, the shell 12 may be a cylindrical structure with an opening at at least one end, and the end cap 13 is sealed to cover the opening, and the end cap 13 and the shell 12 together form a storage space for accommodating components such as the electrode assembly 3 and the electrolyte. The wall portion 11 may be a certain partial structure in the housing 1, which may be the end cap 13 or a partial structure in the shell 12.

[0113] The electrode terminal 2 may be a connection terminal disposed on the wall portion 11 of the housing 1, which is electrically connected to the electrode assembly 3 in the battery cell 20 and protrudes outward from the housing 1. The electrode terminal 2 is used to electrically connect to an external electrical device to transmit electrical energy to the external electrical device. The electrode terminal 2 includes but is not limited to a cylindrical structure, and may also be a prismatic structure or other shapes.

[0114] The electrode assembly 3 may include a first pole tab 32, a pole piece 35 and a separator 34. The pole piece 35 may include a positive pole piece and a negative pole piece with opposite polarities. The positive pole piece and the negative pole piece may be used as a positive electrode and a negative electrode, respectively. The separator 34 is stacked between the positive pole piece and the negative pole piece to isolate the positive pole piece and the negative pole piece. Among them, the surface of the positive current collector in the positive pole piece is coated with a positive active material layer, and the surface of the negative current collector in the negative pole piece is coated with a negative active material layer. The first pole tab 32 is connected to the positive current collector or the negative current collector and extends from one end of the positive current collector or the negative current collector facing the wall 11. The first pole tab 32 is electrically connected to the electrode terminal 2, so that the pole piece 35 can be electrically connected to the electrode terminal 2.

[0115] The insulating member 4 may be a component with insulating properties, and may be made of insulating materials such as rubber and plastic. The first insulating portion 41 and the second insulating portion 42 are partial structures in the insulating member 4, respectively, and the two are connected to each other. The first insulating portion 41 surrounds the outside of the first pole ear 32, and the first insulating portion 41 may be a cylindrical structure, and the first insulating portion 41 is sleeved on the outside of the first pole ear 32 to achieve insulation between the first pole ear 32 and the housing 1.

[0116] The second insulating portion 42 may be a portion connected to the end of the first insulating portion 41. The second insulating portion 42 is connected to the end of the first insulating portion 41 along its own axial direction, so that when the first insulating portion 41 is sleeved on the outside of the first pole ear 32, the second insulating portion 42 is located between the wall portion 11 and the first pole ear 32, and is used to insulate the first pole ear 32 from the wall portion 11.

[0117] In the above structure, since the first insulating portion 41 of the insulating member 4 surrounds the outside of the first pole lug 32 and the second insulating portion 42 is located between the wall portion 11 and the first pole lug 32, the insulating member 4 can insulate the first pole lug 32 from the outer shell 1, reducing the insulation treatment steps such as sticking insulating glue on the first pole lug 32, which is beneficial to improving the production efficiency of the battery cell 20.

[0118] Exemplarily, the insulating member 4 is an integrally formed structure. The first insulating portion 41 and the second insulating portion 42 can be integrally formed by injection molding, so that the insulating member 4 has good structural strength.

[0119] In some embodiments, continue to refer to Figures 9 to 12 A notch 411 is provided on the end surface of the first insulating portion 41 facing away from the second insulating portion 42 , and the notch 411 penetrates the first insulating portion 41 along the thickness direction of the first insulating portion 41 .

[0120] The notch 411 may be a structure formed by removing material from the first insulating portion 41. By providing an inwardly recessed notch 411 on the end surface of the first insulating portion 41 away from the second insulating portion 42, and allowing the notch 411 to penetrate the first insulating portion 41 along the thickness direction of the first insulating portion 41, the first insulating portion 41 can be opened at the notch 411 during the process of the first pole tab 32 extending into the space enclosed by the first insulating portion 41, and the opening of the first insulating portion 41 away from the second insulating portion 42 can be enlarged, so that the first pole tab 32 can be more easily inserted into the space enclosed by the first insulating portion 41, which is conducive to improving the convenience of assembling the battery cell 20.

[0121] In some embodiments, the first insulating portion 41 is provided with a plurality of notches 411 , and the plurality of notches 411 are arranged along the circumference of the first insulating portion 41 .

[0122] By providing a plurality of notches 411 on the first insulating portion 41 and arranging the plurality of notches 411 along the circumference of the first insulating portion 41, when the first pole ear 32 extends into the space enclosed by the first insulating portion 41, the opening of the first insulating portion 41 away from the second insulating portion 42 can be more easily enlarged, thereby further facilitating the first pole ear 32 to be inserted into the space enclosed by the first insulating portion 41.

[0123] The plurality of notches 411 are arranged along the circumference of the first insulating portion 41 , and the plurality of notches 411 may be arranged at equal intervals along the circumference of the first insulating portion 41 , so that the opening of the first insulating portion 41 away from the second insulating portion 42 can be uniformly enlarged, which is beneficial to improving the smoothness of the first pole lug 32 during the insertion process.

[0124] In some embodiments, continue to refer to Fig.12 , along the direction from the first insulating portion 41 to the electrode assembly 3 , the width of the notch 411 in the circumferential direction of the first electrode tab 32 gradually increases.

[0125] By setting the width of the notch 411 in the circumferential direction of the first electrode ear 32 to gradually increase along the direction from the first insulating portion 41 to the electrode assembly 3, the notch 411 can be in a V-shaped structure with the opening facing away from the first insulating portion 41, which facilitates the opening of the second insulating portion 42 to open.

[0126] In some embodiments, continue to refer to Figure 7 The battery cell 20 also includes a current collector 5 connected to the first pole ear 32. The first insulating portion 41 encloses a receiving cavity 412. The current collector 5 is located in the receiving cavity 412. At least part of the current collector 5 is located between the second insulating portion 42 and the first pole ear 32. A through hole 421 communicating with the receiving cavity 412 is formed on the second insulating portion 42. The current collector 5 is connected to the electrode terminal 2 through the through hole 421.

[0127] The current collector 5 may be a component connected to the plurality of first electrode tabs 32 in the electrode assembly 3 , and may collect currents drawn from the plurality of first electrode tabs 32 to facilitate electrical connection between the first electrode tabs 32 and the electrode terminal 2 .

[0128] The accommodating inner cavity 412 may be a space surrounded by the first insulating portion 41 , which is used to accommodate the current collecting member 5 and at least a portion of the first electrode tab 32 .

[0129] The through hole 421 may be a hole-shaped structure provided on the second insulating part 42 and extending through the second insulating part 42 in the thickness direction. Since the second insulating part 42 is provided with the through hole 421 extending through the second insulating part 42 in the thickness direction, the through hole 421 connects the accommodating cavity 412 with the outside, and the current collecting member 5 located in the accommodating cavity 412 can be connected to the electrode terminal 2 through the through hole 421.

[0130] At least part of the current collector 5 is located between the second insulating part 42 and the first pole ear 32, which may mean that the diameter of the current collector 5 is larger than the diameter of the through hole 421, a part of the current collector 5 is located between the second insulating part 42 and the first pole ear 32, and another part of the current collector 5 corresponds to the through hole 421 and is electrically connected to the electrode terminal 2 through the through hole 421.

[0131] In some embodiments, along the thickness direction of the wall portion 11 , the size of the first insulating portion 41 is H1 , the thickness of the current collecting member 5 is H3 , the size of the notch 411 is H4 , and H4 ≤ H1 - H3 .

[0132] The dimension of the first insulating part 41 in the thickness direction of the wall 11 is set to H1, the thickness of the current collector 5 in the thickness direction of the wall 11 is set to H3, and the dimension of the notch 411 in the thickness direction of the wall 11 is set to H4, and H4≤H1-H3, so that the dimension obtained by subtracting the depth of the current collector 5 in the thickness direction of the wall 11 from the depth of the accommodating cavity 412 in the thickness direction of the wall 11 is greater than the dimension of the notch 411 in the thickness direction of the wall 11, so that the current collector 5 can be completely surrounded by the first insulating part 41 in its own circumferential direction, and it is not easy for the current collector 5 to leak electricity to the shell 12 through the notch 411, which is beneficial to improving the reliability of the battery cell 20.

[0133] In some embodiments, H4≤H1-H3-0.2mm, so that the current collector 5 can be better completely surrounded by the first insulating portion 41 in its own circumferential direction, and the current collector 5 is not easy to leak electricity to the shell 12 through the gap 411, which is beneficial to improving the reliability of the battery cell 20.

[0134] In some embodiments, the electrode assembly 3 also includes a stacked pole piece 35 and an isolating member 34, and the first pole ear 32 is connected to the pole piece 35 and extends out of the isolating member 34; along the thickness direction of the wall portion 11, the size of the first insulating portion 41 is H1, the size of the first pole ear 32 extending out of the isolating member 34 is H2, and the thickness of the current collector 5 is H3, H1≥H2+H3.

[0135] The first pole ear 32 is a component provided on the pole piece 35 for electrically connecting with the current collector 5 of the battery cell 20 . It is provided at the end of the pole piece 35 along the thickness direction of the wall portion 11 , so that the end of the pole piece 35 along the thickness direction of the wall portion 11 can be connected to the current collector 5 through the first pole ear 32 .

[0136] Exemplarily, by arranging a plurality of first pole lugs 32 at intervals at the end of the pole piece 35 , the pole piece 35 can transfer electric energy to other components uniformly and stably through the plurality of first pole lugs 32 .

[0137] The stacking arrangement of the pole pieces 35 and the isolation members 34 may refer to that the electrode assembly 3 is a laminated structure, in which the pole pieces 35 and isolation members 34 in sheet form are stacked in layers; or it may refer to that the electrode assembly 3 is a winding structure, in which the pole pieces 35 and isolation members 34 in strip form are stacked and then wound in a winding direction.

[0138] The connection between the first pole tab 32 and the pole piece 35 may refer to the connection between the first pole tab 32 and the current collector in the pole piece 35 . By extending the first pole tab 32 out of the isolation member 34 , the first pole tab 32 can lead the current of the pole piece 35 outward.

[0139] The dimension of the first insulating part 41 in the thickness direction of the wall 11 is set to H1, the dimension of the first pole tab 32 extending out of the isolation part 34 in the thickness direction of the wall 11 is set to H2, and the thickness of the current collector 5 in the thickness direction of the wall 11 is set to H3. By making H1≥H2+H3, the current collector 5 and the portion of the first pole tab 32 extending out of the isolation part 34 can be completely located in the accommodating space surrounded by the first insulating part 41, so that the first insulating part 41 can surround the portion of the current collector 5 and the first pole tab 32 extending out of the isolation part 34, thereby reducing the leakage of the portion of the current collector 5 and the first pole tab 32 extending out of the isolation part 34 to the shell 12, which is beneficial to improving the reliability of the battery cell 20.

[0140] In some embodiments, the first pole tab 32 is a columnar body, the length of the first pole tab 32 along the winding direction is L1, the length of the pole piece 35 along the winding direction is L2, and L1 / L2≥50%.

[0141] Continue to refer Figure 3 The electrode assembly 3 is a winding structure, and the first electrode tab 32 is a columnar body. The first electrode tab 32 extending from the separator 34 may be a columnar body structure after a flattening process.

[0142] By setting the length of the first pole lug 32 along the winding direction to L1, setting the length of the pole piece 35 along the winding direction to L2, and making L1 / L2≥50%, the length of the first pole lug 32 in the winding direction is sufficient, which is beneficial to improving the current carrying capacity of the first pole lug 32.

[0143] Exemplarily, the ratio L1 / L2 of the length L1 of the first pole tab 32 along the winding direction to the length L2 of the pole piece 35 along the winding direction can be 50%, 60% or 70%, so that the length of the first pole tab 32 in the winding direction is sufficient, which is beneficial to improve the current carrying capacity of the first pole tab 32.

[0144] In some embodiments, the battery cell 20 also includes a current collector 5 connected to the first pole ear 32, the first insulating portion 41 encloses a receiving cavity 412, the current collector 5 is located in the receiving cavity 412, and at least a portion of the current collector 5 is located between the second insulating portion 42 and the first pole ear 32; a through hole 421 communicating with the receiving cavity 412 is formed on the second insulating portion 42, and the current collector 5 is connected to the electrode terminal 2 through the through hole 421; the battery cell 20 also includes an insulating structure 6, the insulating structure 6 is arranged on the surface of the wall portion 11 facing the electrode assembly 3, and at least a portion of the insulating structure 6 is located between the wall portion 11 and the second insulating portion 42.

[0145] The insulating structure 6 may refer to a structure with insulating properties, which may be made of insulating materials such as rubber and plastic. The insulating structure 6 is disposed on the surface of the wall 11 facing the electrode assembly 3, and the insulating structure 6 may be formed with insulating material on the surface of the wall 11 facing the electrode assembly 3 by using the wall 11 as an insert.

[0146] By making at least a portion of the insulating structure 6 located between the wall portion 11 and the second insulating portion 42 , the wall portion 11 can press or block the second insulating portion 42 through the insulating structure 6 , which is beneficial to improving the stability of the insulating member 4 installed on the electrode assembly 3 .

[0147] In some embodiments, along the direction from the first insulating portion 41 to the first electrode tab 32 , at least a portion of the insulating structure 6 extends out of the inner wall surface of the through hole 421 to insulate the current collecting member 5 from the wall portion 11 .

[0148] By making at least part of the insulating structure 6 extend out of the inner wall surface of the through hole 421 along the direction from the first insulating portion 41 to the first pole ear 32 , at least part of the insulating structure 6 can cover the through hole 421 and insulate the insulating member 4 and the wall portion 11 located in the accommodating cavity 412 .

[0149] In some embodiments, at least a portion of the insulating structure 6 extending out from the inner wall of the through hole 421 abuts against the current collecting member 5 to press the first electrode tab 32 .

[0150] By making at least part of the insulating structure 6 extending out of the inner wall of the through hole 421 press against the current collector 5, the current collector 5 can squeeze the first pole ear 32 under the action of the insulating structure 6, so that the first pole ear 32 is in a compressed state, so that the first pole ear 32 can be stably connected to the current collector 5 under the action of its own elastic restoring force.

[0151] In some embodiments, at least a portion of the insulating structure 6 is sandwiched between the wall portion 11 and the second insulating portion 42 .

[0152] By sandwiching at least a portion of the insulating structure 6 between the wall portion 11 and the second insulating portion 42, the insulating structure 6 can push the insulating member 4 to stably cover the end of the electrode assembly 3, thereby reducing the possibility of the insulating member 4 falling off the electrode assembly 3.

[0153] In some embodiments, along the thickness direction of the wall portion 11 , the overlapping area between the projection of the insulating structure 6 and the projection of the second insulating portion 42 is annular, and the width of the overlapping area in the radial direction of the first electrode tab 32 is D, and D≥0.8 mm.

[0154] By setting the overlapping area of ​​the projection of the insulating structure 6 in the thickness direction of the wall 11 and the projection of the second insulating part 42 in the thickness direction of the wall 11 to be ring-shaped, the insulating structure 6 presses or blocks the second insulating part 42 in the entire circle around the through hole 421, which is beneficial to improving the stability of the action on the second insulating part 42.

[0155] By setting the width D of the overlap region in the radial direction of the first electrode tab 32 to be D≧0.8 mm, the overlap region has a sufficient width, so that the insulating structure 6 can stably press or block the second insulating portion 42 .

[0156] For example, the width D of the overlapped region in the radial direction of the first electrode tab 32 may be set to 0.8 mm, 1 mm or 1.2 mm, so that the pressing or blocking of the second insulating portion 42 by the insulating structure 6 is stable.

[0157] In some embodiments, along the thickness direction of the wall portion 11 , the wall thickness of the second insulating portion 42 is T1 , and 0.05 mm≤T1≤4 mm.

[0158] By setting the wall thickness T1 of the second insulating part 42 in the thickness direction of the wall part 11 to a range of 0.05mm≤T1≤4mm, the second insulating part 42 has sufficient thickness to improve the structural strength of the insulating member 4, while preventing the second insulating part 42 from causing material waste due to excessive thickness.

[0159] In some embodiments, 0.1 mm ≤ T1 ≤ 2 mm. For example, T1 can be set to 0.5 mm, 1 mm or 1.5 mm, so that the second insulating portion 42 has sufficient thickness to improve the structural strength of the insulating member 4, and the second insulating portion 42 is not prone to waste of material due to excessive thickness.

[0160] In some embodiments, the first insulating portion 41 encloses a receiving cavity 412 , and at least a portion of the first pole ear 32 is received in the receiving cavity 412 ; along the direction from the first pole ear 32 to the first insulating portion 41 , at least a portion of the receiving cavity 412 decreases in radial dimension of the first pole ear 32 .

[0161] By reducing the radial dimension of at least a portion of the accommodating inner cavity 412 along the direction from the first pole ear 32 to the first insulating part 41, the radial dimension of the accommodating inner cavity 412 away from the first insulating part 41 is larger than the radial dimension close to the first insulating part 41, so that the collector 5 and the first pole ear 32 can be easily inserted from the opening of the accommodating inner cavity 412 away from the second insulating part 42.

[0162] For example, the size of at least a portion of the accommodating inner cavity 412 in the radial direction of the first pole ear 32 may gradually decrease, so that the radial size of the accommodating inner cavity 412 changes continuously; or the size of at least a portion of the accommodating inner cavity 412 in the radial direction of the first pole ear 32 may decrease in a step-like manner, so that the radial size of the accommodating inner cavity 412 changes discontinuously.

[0163] In some embodiments, the thickness of the end region of the first insulating portion 41 away from the second insulating portion 42 is smaller than the thickness of the end region of the first insulating portion 41 close to the second insulating portion 42 .

[0164] By setting the thickness of the end area of ​​the first insulating part 41 away from the second insulating part 42 to be smaller than the thickness of the end area of ​​the first insulating part 41 close to the second insulating part 42, the first insulating part 41 changes the radial dimension of the accommodating cavity 412 by changing its own wall thickness, so that the current collecting part 5 and the first pole ear 32 can be easily inserted from the opening of the accommodating cavity 412 away from the second insulating part 42.

[0165] Exemplarily, the thickness of the first insulating portion 41 may vary continuously or in a step-like manner, and those skilled in the art may change the thickness of the first insulating portion 41 according to actual conditions.

[0166] In some embodiments, continue to refer to Fig.11 , along the direction from the first electrode tab 32 to the first insulating portion 41 , the thickness of at least a portion of the first insulating portion 41 gradually increases.

[0167] By setting the thickness of at least part of the first insulating portion 41 to gradually increase along the direction from the first pole ear 32 to the first insulating portion 41 , the thickness of the first insulating portion 41 changes continuously, which is beneficial to reducing the possibility of stress concentration on the first insulating portion 41 .

[0168] In some embodiments, the electrode assembly 3 further includes a second electrode tab 33 having a polarity opposite to that of the first electrode tab 32 , and the second electrode tab 33 is electrically connected to the housing 1 .

[0169] The second pole tab 33 may be a component that has a polarity opposite to that of the first pole tab 32 and leads the current of the pole piece 35 outward. The second pole tab 33 extends out of the isolation member 34 and is electrically connected to the housing 1 .

[0170] In some embodiments, the housing 1 includes a shell 12 and an end cover 13, the shell 12 includes an end wall 121 and a side wall 122, the side wall 122 is arranged around the outer periphery of the end wall 121, one end of the side wall 122 is connected to the end wall 121, and the other end forms an opening opposite to the end wall 121, the end cover 13 covers the opening, and the wall portion 11 is the end wall 121 or the end cover 13.

[0171] The shell 12 may be a cylindrical structure with an opening at one end, and the end cap 13 is sealed to cover the opening. The end cap 13 and the shell 12 together form a storage space for accommodating the electrode assembly 3, the insulating member 4, and other components and the electrolyte. The side wall 122 may be a structure arranged around the outer periphery of the end wall 121 in the shell 12, one end of the side wall 122 is connected to the end wall 121, and the other end forms an opening opposite to the end wall 121. Exemplarily, the shell 12 is an integrally formed structure, and the end wall 121 and the side wall 122 are integrally formed by a stamping process.

[0172] The wall portion 11 in the present application may be an end wall 121 or an end cover 13 , so that the electrode terminal 2 is located at the end of the battery cell 20 , which facilitates the battery cell 20 to output electrical energy to the outside.

[0173] Some embodiments of the present application further provide a battery 100 , which includes a battery cell 20 provided by the above technical solution.

[0174] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0175] Some embodiments of the present application provide a battery cell 20, which includes a shell 1, an electrode terminal 2, an electrode assembly 3, a current collector 5 and an insulating member 4, wherein the electrode terminal 2 is arranged on the wall 11 of the shell 1, and the electrode assembly 3 is located in the shell 1, and the first pole ear 32 thereon is connected to the current collector 5, and the current collector 5 and the first pole ear 32 are located in a accommodating cavity 412 formed by the insulating member 4, and the first insulating portion 41 of the insulating member 4 surrounds the outside of the first pole ear 32 and the current collector 5, and the current collector 5 is connected to the electrode terminal 2 through a through hole 421 in the second insulating portion 42, and the end surface of the first insulating portion 41 facing away from the second insulating portion 42 is provided with a notch 411 penetrating the first insulating portion 41. In the above structure, since the first insulating portion 41 of the insulating member 4 surrounds the outside of the first pole lug 32 and the second insulating portion 42 is located between the wall portion 11 and the first pole lug 32, the insulating member 4 can insulate the first pole lug 32 from the outer shell 1, reducing the insulation treatment steps such as sticking insulating glue on the first pole lug 32, which is beneficial to improving the production efficiency of the battery cell 20.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing, including a wall portion; an electrode terminal, disposed on the wall portion; An electrode assembly, contained in the housing, comprising a first electrode tab, wherein the first electrode tab is electrically connected to the electrode terminal; The insulating member includes a first insulating portion and a second insulating portion, wherein the first insulating portion surrounds the outside of the first pole lug, the second insulating portion is connected to the first insulating portion and is located between the wall portion and the first pole lug, and a notch is provided on the end surface of the first insulating portion facing away from the second insulating portion, and the notch penetrates the first insulating portion along the thickness direction of the first insulating portion.

2. The battery cell according to claim 1, characterized in that: The first insulating portion is provided with a plurality of the notches, and the plurality of the notches are arranged along a circumferential direction of the first insulating portion.

3. The battery cell according to claim 1, characterized in that: Along the direction from the first insulating portion to the electrode assembly, the width of the notch in the circumferential direction of the first electrode tab gradually increases.

4. The battery cell according to claim 1, characterized in that: The battery cell further includes a current collector connected to the first pole lug, the first insulating portion encloses to form a receiving inner cavity, the current collector is located in the receiving inner cavity, and at least a portion of the current collector is located between the second insulating portion and the first pole lug; A through hole communicating with the accommodating inner cavity is formed on the second insulating portion, and the current collecting member is connected to the electrode terminal through the through hole.

5. The battery cell according to claim 4, characterized in that: Along the thickness direction of the wall portion, the size of the first insulating portion is H1, the thickness of the current collecting member is H3, the size of the notch is H4, and H4≤H1-H3.

6. The battery cell according to claim 4, characterized in that: The electrode assembly also includes stacked pole pieces and separators, the first pole tab is connected to the pole piece and extends out of the separator; along the thickness direction of the wall portion, the size of the first insulating portion is H1, the size of the first pole tab extending out of the separator is H2, the thickness of the current collector is H3, H1≥H2+H3.

7. The battery cell according to claim 6, characterized in that: The first pole lug is a columnar body, the length of the first pole lug along the winding direction is L1, the length of the pole piece along the winding direction is L2, and L1 / L2≥50%.

8. The battery cell according to claim 1, characterized in that: The battery cell further includes a current collector connected to the first pole lug, the first insulating portion encloses to form a receiving inner cavity, the current collector is located in the receiving inner cavity, and at least a portion of the current collector is located between the second insulating portion and the first pole lug; The second insulating portion is formed with a through hole communicating with the accommodating inner cavity, and the current collector is connected to the electrode terminal through the through hole; The battery cell further includes an insulating structure, which is disposed on a surface of the wall portion facing the electrode assembly, and at least a portion of the insulating structure is located between the wall portion and the second insulating portion.

9. The battery cell according to claim 8, characterized in that: Along the direction from the first insulating portion to the first electrode tab, at least a portion of the insulating structure extends out of the inner wall surface of the through hole to insulate the current collecting member from the wall portion.

10. The battery cell according to claim 9, characterized in that: At least a portion of the insulating structure extending out of the inner wall surface of the through hole abuts against the current collecting member to press the first electrode tab.

11. The battery cell according to claim 8, characterized in that: At least a portion of the insulating structure is sandwiched between the wall portion and the second insulating portion.

12. The battery cell according to claim 8, characterized in that: Along the thickness direction of the wall portion, an overlapping area between the projection of the insulating structure and the projection of the second insulating portion is annular, and a width of the overlapping area in the radial direction of the first pole tab is D, where D≥0.8 mm.

13. The battery cell according to claim 1, characterized in that: Along the thickness direction of the wall portion, the wall thickness of the second insulating portion is T1, 0.05 mm≤T1≤4 mm.

14. The battery cell according to claim 1, characterized in that: The first insulating portion encloses to form an accommodating inner cavity, and at least a portion of the first electrode tab is accommodated in the accommodating inner cavity; Along the direction from the first pole tab to the first insulating portion, a size of at least a portion of the accommodating inner cavity in the radial direction of the first pole tab decreases.

15. The battery cell according to claim 1, characterized in that: A thickness of an end region of the first insulating portion away from the second insulating portion is smaller than a thickness of an end region of the first insulating portion close to the second insulating portion.

16. The battery cell according to claim 15, characterized in that: Along a direction from the first electrode tab to the first insulating portion, a thickness of at least a portion of the first insulating portion gradually increases.

17. The battery cell according to claim 1, characterized in that: The electrode assembly further includes a second electrode tab having a polarity opposite to that of the first electrode tab, and the second electrode tab is electrically connected to the housing.

18. The battery cell according to claim 1, characterized in that: The outer shell includes a shell and an end cover, the shell includes an end wall and a side wall, the side wall is arranged around the outer periphery of the end wall, one end of the side wall is connected to the end wall, and the other end forms an opening opposite to the end wall, the end cover covers the opening, and the wall portion is the end wall or the end cover.

19. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 18.

20. An electrical device, characterized in that: Comprising a battery as claimed in claim 19, the battery is used to provide electrical energy.

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