CN221057481U - Battery monomer, battery and electric equipment - Google Patents
Battery monomer, battery and electric equipment Download PDFInfo
- Publication number
- CN221057481U CN221057481U CN202420516635.6U CN202420516635U CN221057481U CN 221057481 U CN221057481 U CN 221057481U CN 202420516635 U CN202420516635 U CN 202420516635U CN 221057481 U CN221057481 U CN 221057481U
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- electrode assembly
- adhesive tape
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- 239000000178 monomer Substances 0.000 title abstract description 6
- 239000002390 adhesive tape Substances 0.000 claims abstract description 96
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- 230000008018 melting Effects 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
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- 229920002647 polyamide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002203 sulfidic glass Substances 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application provides a battery monomer, a battery and electric equipment, and relates to the technical field of batteries. The battery cell includes: a housing; an electrode assembly accommodated in the case; an adhesive tape adhered to an outer surface of the electrode assembly; wherein the adhesive tape comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, and lambda is less than 0.24. The shell comprises a shell body and an end cover, wherein the shell body is provided with an opening, and the end cover seals the opening; the battery cell further comprises an insulating member, the insulating member wraps the electrode assembly, the adhesive tape is arranged between the outer surface of the electrode assembly and the insulating member, and the insulating member is configured to insulate and isolate the electrode assembly from the shell; the adhesive tape further comprises a substrate layer, wherein the substrate layer is an adhesive tape body with an adhesive function, and the heat-resistant layer is a coating arranged on the substrate layer; or, the adhesive tape is a heat-resistant layer having an adhesive function.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.
Background
In the current lithium battery system, when thermal runaway occurs in the battery, the temperature and the air pressure of the battery are rapidly increased, the battery core can transfer the temperature to the outer shell, and then the battery is transferred to the adjacent battery, so that the condition of thermal diffusion of the adjacent battery can be caused, the dangerous conditions such as fire and explosion are easily caused, the safety of the battery is lower, and the current use requirement cannot be met.
Disclosure of utility model
Therefore, an objective of the embodiments of the present application is to provide a battery unit, a battery and an electric device, so as to solve the problem of low battery safety in the prior art.
In order to solve the above problems, in a first aspect, an embodiment of the present application provides a battery cell including:
a housing;
an electrode assembly accommodated in the case;
an adhesive tape adhered to an outer surface of the electrode assembly;
Wherein the adhesive tape comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, lambda is less than 0.24;
Wherein the housing comprises a shell and an end cap, the shell having an opening, the end cap closing the opening; the battery cell further includes an insulating member wrapping the electrode assembly, the adhesive tape being disposed between an outer surface of the electrode assembly and the insulating member, the insulating member being configured to insulate the electrode assembly from the case;
The adhesive tape further comprises a substrate layer, wherein the substrate layer is an adhesive tape body with an adhesive function, and the heat-resistant layer is a coating arranged on the substrate layer;
Or the adhesive tape is the heat-resistant layer with an adhesive function.
In the implementation process, the adhesive tape with the heat-resistant layer is adhered to the outer side of the electrode assembly, so that the adhesive tape can be used as a temperature isolation assembly between the electrode assembly and the shell, and the adhesive tape has high temperature resistance and/or high heat insulation performance due to the fact that the melting point of the heat-resistant layer is high and/or the heat conductivity coefficient is low, and temperature transmission between the electrode assembly and the shell can be effectively reduced. The case may include a case having an opening and an end cap closing the opening to accommodate the electrode assembly. And, an insulating member may be further provided between the case and the electrode assembly to insulate the electrode assembly. The base material layer is an adhesive tape body with an adhesive function so as to be adhered with the outer surface of the electrode assembly to serve as a corresponding identification adhesive tape. The heat-resistant material and/or the heat-insulating material can be sprayed on the substrate layer in a spraying manner to obtain a uniform coating serving as the heat-resistant layer, so that a uniform temperature isolation effect is realized. The heat-resistant layer can also be directly used for manufacturing the adhesive tape for bonding the outer surface of the electrode assembly, so that the contact time of the electrode assembly and the shell is delayed, and the heat diffusion between the electrode assembly and the shell is reduced. When the temperature and the air pressure of the electrode assembly in the battery are increased, the adhesive tape with high temperature resistance and/or high heat insulation performance can not be melted by the high temperature generated by the electrode assembly, isolate the high temperature generated by the electrode assembly, reduce the adverse condition that the high temperature on the electrode assembly is transferred to the shell, further reduce the temperature transfer between the shell and the adjacent battery, further reduce the dangerous conditions such as fire and explosion caused by the heat diffusion of the adjacent battery, effectively improve the safety and the stability of the battery, and be applicable to electric equipment for various applications.
In some embodiments, the inner side of the substrate layer is bonded to the outer surface of the electrode assembly, the substrate layer having a melting point lower than the melting point of the heat resistant layer, and/or the heat resistant layer having a thermal conductivity lower than the thermal conductivity of the substrate layer; the heat-resistant layer is arranged on the outer side surface of the base material layer, which faces away from the electrode assembly. Through setting up corresponding heat-resisting layer on the one side that original substrate layer deviates from electrode assembly, substrate layer and electrode assembly non-bonding's one side to obtain the sticky tape that has high temperature resistance and/or high thermal-insulated performance, can delay electrode assembly and the time of shell contact effectively under the circumstances that realizes sticky tape sign and bonding function, thereby reduce the thermal diffusion between electrode assembly and the shell.
In some embodiments, the substrate layer has a thickness D 1,0.01mm≤D1 ∈0.5mm. Considering that the adhesive tape is adhered to the outer surface of the electrode assembly and is arranged between the electrode assembly and the shell, in order to adapt to the space condition between the electrode assembly and the shell, D 1 is more than or equal to 0.01mm, so that the substrate layer has effective material thickness, the problems that normal coating cannot be carried out and deformation is easy to occur due to too thin material are solved, and D 1 is less than or equal to 0.5mm, so that adverse effects on normal lamination and battery packaging due to too thick material are reduced. By reasonably designing the thickness of the substrate layer, the functionality and applicability of the substrate layer are considered.
In some embodiments, the thickness of the heat-resistant layer is D 2,1μm≤D2≤300μm.D2 is more than or equal to 1 mu m, so that the heat-resistant layer on the substrate layer has effective material thickness, and the condition of poor temperature isolation effect caused by too thin material is reduced; and D 2 is less than or equal to 300 mu m, so that the heat-resistant layer on the substrate layer cannot influence the normal adhesion of the adhesive tape and the normal packaging of the battery due to too thick, and the functions and the applicability of the adhesive tape are considered by reasonably designing the thicknesses of the substrate layer and the heat-resistant layer.
In some embodiments, if the adhesive tape is the heat-resistant layer with an adhesive function, the thickness of the adhesive tape is D 3,0.01mm≤D3 -0.5 mm. In the case that the adhesive tape is a heat-resistant layer with an adhesive function, the adhesive tape is adhered to the outer surface of the electrode assembly and is arranged between the electrode assembly and the shell, so that in order to adapt to the space condition between the electrode assembly and the shell, D 3 is more than or equal to 0.01mm, the heat-resistant layer has an effective material thickness, and the condition that the temperature isolation effect is poor due to too thin material is reduced; d 3 is less than or equal to 0.5mm, so that the normal lamination of the heat-resistant layer cannot be influenced due to the fact that the heat-resistant layer is too thick, and the functions and the applicability of the adhesive tape are considered through reasonably designing the thickness of the heat-resistant layer.
In some embodiments, the electrode assembly includes a body portion and a tab, at least one end of the body portion in a first direction is provided with the tab, the adhesive tape extends around an axis parallel to the first direction and is adhered to an outer surface of the body portion, an extension length of the adhesive tape is L 1, a maximum dimension of the body portion in a second direction is L 2, the second direction is perpendicular to the first direction, the body portion has a first outer surface, the first outer surface is an outer surface with the largest area in the body portion, the first outer surface is parallel to the first direction and the second direction, and 1.ltoreq.L 1/L2.ltoreq.1.1. The length of the corresponding adhesive tape can be selected and designed according to the actual length of the electrode assembly, the heat insulation effect caused by too short adhesive tape can be effectively reduced, and the material waste caused by too long adhesive tape can be effectively reduced, so that the better heat insulation effect can be realized under the condition of low cost.
In some embodiments, the tape has a maximum dimension L 3 and the main body portion has a maximum dimension L 4,1.2≤L3/L4.ltoreq.2 in the first direction. The corresponding adhesive tape width can be selected and designed according to the actual width of the electrode assembly, the heat insulation effect caused by the fact that the adhesive tape is too narrow can be effectively reduced, and the material waste caused by the fact that the adhesive tape is too wide can be effectively reduced, so that the good heat insulation effect can be achieved under the condition of low cost.
In some embodiments, the heat resistant layer comprises: the heat-resistant layer comprises at least one layer of heat-resistant material and/or heat-insulating material; the heat-resistant material includes: ceramic material, plastic material or metal material with melting point of 150 deg.c or higher; the heat insulating material comprises: ceramic material with heat conductivity less than 0.24, asbestos material, rock wool material, aerogel felt material. The heat-resistant layer with a single-layer structure or the heat-resistant layer with a multi-layer composite layer structure is manufactured by using various heat-resistant materials with higher melting points exceeding or equal to 150 ℃ and/or heat-insulating materials with lower heat conductivity, so that the stability of the heat-resistant layer under the condition that the electrode assembly generates high temperature is effectively improved, the temperature isolation function is realized, and the temperature protection effect is effectively improved.
In some embodiments, a metal material of the heat-resistant material is disposed at a side of the heat-resistant layer facing away from the electrode assembly. Since the metal material has good conductivity, in order to enable the adhesive tape to have a corresponding insulating function, when the metal material is included in the heat-resistant layer, the metal material may be disposed on a side of the heat-resistant layer facing away from the electrode assembly, so as to perform insulation protection on the electrode assembly under the condition of realizing the high temperature resistant function.
In some embodiments, the heat insulating material is disposed on a side of the heat resistant layer adjacent to the electrode assembly. When the heat-resistant layer includes a heat-insulating material, in order to achieve better heat-insulating performance, the heat-insulating material may be disposed at a side of the heat-resistant layer adjacent to the electrode assembly to reduce a distance between the heat-insulating material and the electrode assembly, thereby improving a heat-insulating effect of the heat-resistant layer.
In some embodiments, the material thickness of each layer structure in the heat resistant layer is D 4,0.003mm≤D4 +.0.5 mm. In the case that the heat-resistant layer has a composite multi-layer structure, the material thickness of each layer structure can be defined according to actual conditions to reasonably set the thickness of the heat-resistant layer, so that the thickness of the adhesive tape is reasonably set, and the thickness of the adhesive tape is controlled while high temperature resistance and/or high heat insulation performance is realized, so that normal battery assembly is realized.
In some embodiments, the tape is provided with an identification portion thereon. The identification part can be provided with two-dimensional codes, cursor positioning or other types of identification information so as to identify relevant parameters of the electrode assembly and facilitate subsequent verification, information acquisition and other processes.
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 for the electric device.
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 of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can 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 exploded view of a battery cell according to some embodiments of the present application;
fig. 4 is a schematic structural view of the battery cell shown in fig. 3;
FIG. 5 is a schematic view of the assembled structure of the adhesive tape shown in FIG. 4;
FIG. 6 is an enlarged partial cross-sectional view of the first adhesive tape shown in FIG. 5 at A;
FIG. 7 is an enlarged partial cross-sectional view of a portion of the second tape shown in FIG. 5 at A;
Fig. 8 is a schematic diagram illustrating a specific structure of the battery cell shown in fig. 4.
Icon: 1-a housing; 11-a housing; 12-end caps; a 2-electrode assembly; 21-electrode lugs; 22-a main body; 221-a first outer surface; 3-electrode terminals; 4-a current collecting member; 5-insulating member; 6-adhesive tape; 61-a substrate layer; 611-inner side; 612-outer side; 62-a heat resistant layer; 71-blue glue; 72-blue film; 73-a logo; 10-battery cell; 20-a box body; 201-a first part; 202-a second part; 100-cell; 200-a controller; 300-motor; 1000-vehicle; thickness direction of the X-electrode assembly; y-a first direction; z-second 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.
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 cells include, but are not limited to, lithium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, and the like.
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, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced, and meanwhile, active ions can pass through the separator.
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, surface-silver-treated aluminum, surface-silver-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, 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 the lithium transition metal oxide may include, but are not limited to, at least one of lithium cobalt oxide (e.g., liCoO 2), lithium nickel oxide (e.g., liNiO 2), lithium manganese oxide (e.g., liMnO2, liMn2O 4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide (e.g., liNi1/3Co1/3Mn1/3O2 (may also be abbreviated as NCM 333), lini0.5co0.2mn0.3o2 (may also be abbreviated as NCM 523), lini0.5co0.25mn0.25o2 (may also be abbreviated as NCM 211), lini0.6co0.2mn0.2o2 (may also be abbreviated as NCM 622), lini0.8co0.1mn0.1o2 (may also be abbreviated as NCM 811), lithium nickel cobalt aluminum oxide (e.g., lini0.85co0.15 al0.05o2), and modified compounds thereof.
In some embodiments, the positive electrode may be a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy and 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, titanium, or the like can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy and 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 separator is a separator film. The isolating film may be any known porous isolating film with excellent chemical and mechanical stability.
As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multilayer composite film. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different. 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 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 include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.
In some embodiments, the solvent may include 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 include one or more of oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolyte (crystalline lithium super ion conductor (lithium germanium phosphorus sulfide, silver sulfur germanium mine), amorphous sulfide), and halide solid electrolyte, nitride solid electrolyte, and 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 stacked segments stacked one on top of the other, with one positive electrode sheet sandwiched between adjacent stacked segments.
As an example, the positive electrode sheet and the negative electrode sheet are each folded to form a plurality of stacked segments arranged in a stacked manner.
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 is provided with 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 examples, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, or the like.
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.
The inventor discovers that in the existing battery monomer, when thermal runaway occurs in the battery, the temperature and the air pressure of an electrode assembly in the battery rapidly rise, the temperature can be transferred to an outer shell of an outer layer, and then the temperature is transferred to an adjacent battery, so that the condition of heat diffusion of the adjacent battery can be caused, dangerous conditions such as fire and explosion are easy to cause, the safety of the battery is low, and the current use requirement cannot be met.
In view of this, the present application provides a battery cell including a housing; an electrode assembly accommodated in the case; an adhesive tape adhered to an outer surface of the electrode assembly; wherein the adhesive tape comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, and lambda is less than 0.24.
In the battery monomer, the adhesive tape comprises the heat-resistant layer with the melting point C being more than or equal to 150 ℃ and/or the heat conductivity coefficient lambda being less than 0.24, the heat-resistant layer can keep stability under the condition that the electrode assembly generates high temperature, the heat-resistant layer is not melted by the high temperature generated by the electrode assembly, and the heat transfer between the electrode assembly and the shell is reduced, so that the heat diffusion between each battery is reduced, the dangerous conditions such as fire and explosion are reduced, the safety of the battery is effectively improved, and the safety and stability of electric equipment in use are 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 may include 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, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present application. The battery cell 10 may include a case 1 and an electrode assembly 2, the electrode assembly 2 being accommodated in the case 1.
In some embodiments, the housing 1 may include a shell 11 and an end cap 12, the shell 11 having an opening, the end cap 12 closing the opening of the shell 11.
The case 11 is a member for accommodating the electrode assembly 2, and the case 11 may be a hollow structure having one end formed to be open, and the case 11 may be a hollow structure having opposite ends formed to be open. The housing 11 may be of various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, and 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, the 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 11, for example, the housing 11 is a cuboid structure, the end cover 12 is a rectangular plate structure adapted to the housing 11, 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.
In some embodiments, the battery cell 10 may further include an electrode terminal 3, the electrode terminal 3 being provided on the case 1, the electrode terminal 3 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 3 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 3 and the tab 21 may be directly connected, for example, the electrode terminal 3 and the tab 21 may be welded. The electrode terminal 3 and the tab 21 may be indirectly connected, for example, the electrode terminal 3 and the tab 21 may be indirectly connected through the current collecting member 4. The current collecting member 4 may be a metal conductor such as copper, iron, aluminum, steel, aluminum alloy, or the like.
As an example, as shown in fig. 3, an opening is formed at one end of the housing 11, one end cap 12 in the casing 1, and one end cap 12 closes one opening of the housing 11. The end cap 12 is provided with two electrode terminals 3, the two electrode terminals 3 are a positive electrode terminal and a negative electrode terminal, a positive electrode tab and a negative electrode tab are formed at one end of the electrode assembly 2 facing the end cap 12, the positive electrode terminal and the positive electrode tab are connected through one current collecting member 4, and the negative electrode terminal and the negative electrode tab are electrically connected through the other current collecting member 4.
In some embodiments, referring to fig. 3, the battery cell 10 may further include an insulating member 5, where the insulating member 5 is a member separating the case 11 from the electrode assembly 2, and insulating isolation of the case 11 from the electrode assembly 2 is achieved by the insulating member 5. The insulating member 5 is made of an insulating material, and the insulating member 5 includes but is not limited to: plastics, rubber, etc.
As an example, the insulator 5 is coated on the outside of the electrode assembly 2 in the circumferential direction of the opening of the case 11. The number of the electrode assemblies 2 in the case 1 may be one or more. If the electrode assembly 2 is one, the insulating member 5 is coated around the electrode assembly 2; if there are a plurality of electrode assemblies 2, the plurality of electrode assemblies 2 may be stacked in the thickness direction of the electrode assemblies, one insulating member 5 may be disposed corresponding to one electrode assembly 2, each insulating member 5 may be wrapped around one electrode assembly 2, or the plurality of electrode assemblies 2 may be an integral member, and the insulating member 5 may be wrapped around the integral member.
As an example, the insulating member 5 is coated on the outer sides of the plurality of electrode assemblies 2 in the circumferential direction of the opening of the case 11.
In some embodiments, the insulating member 5 may be a protective film such as Mylar (Mylar) film, which can be used to cover the electrode assembly 2, to prevent the separator from being scratched by the case 1 when the electrode assembly 2 is put into the case, and to insulate.
Referring to fig. 4, fig. 4 is a schematic structural diagram of the battery cell 10 shown in fig. 3; the battery cell 10 provided in the embodiment of the application includes: a housing 1; an electrode assembly 2 accommodated in the case 1; a tape 6 adhered to the outer surface of the electrode assembly 2; wherein the adhesive tape 6 comprises a heat-resistant layer 62, the melting point of the heat-resistant layer 62 is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer 62 is lambda, lambda is less than 0.24. The electrode assembly 2 may be a lamination structure or a winding structure. The electrode assembly 2 is flat, the thickness of the electrode assembly 2 is smaller than the width of the electrode assembly 2 and the height of the electrode assembly 2, and the electrode assembly 2 may have a substantially rectangular parallelepiped shape. The shape of the case 11 may be designed according to the actual shape of the electrode assembly 2, for example, the case 11 may have a rectangular parallelepiped shape, and the case 11 has a hollow structure having one end opened to accommodate the electrode assembly 2.
In some embodiments, the adhesive tape 6 may be provided in a corresponding shape according to the specific shape of the electrode assembly 2, and for example, the adhesive tape 6 may be provided in a soft adhesive tape structure having one and one half of the surface area of the electrode assembly 2, or may be provided in a one-piece type unitary structure or other number of separate structures.
In the present embodiment, by bonding the adhesive tape 6 having the heat-resistant layer 62 on the outside of the electrode assembly 2, the adhesive tape 6 can be made to function as a temperature-separation member between the electrode assembly 2 and the case 1, and since the heat-resistant layer 62 has a high melting point and/or a low thermal conductivity, the adhesive tape 6 has high temperature resistance and/or high heat insulation performance, and the temperature transfer between the electrode assembly 2 and the case 1 can be effectively reduced. When the temperature and the air pressure of the electrode assembly 2 in the battery are increased, the adhesive tape 6 with high temperature resistance and/or high heat insulation performance can not be melted by the high temperature generated by the electrode assembly 2, isolate the high temperature generated by the electrode assembly 2, reduce the adverse condition that the high temperature on the electrode assembly 2 is transferred to the shell 1, further reduce the temperature transfer between the shell 1 and the adjacent battery, further reduce the dangerous conditions such as fire, explosion and the like caused by the thermal diffusion of the adjacent battery, effectively improve the safety and the stability of the battery, and be applicable to electric equipment for various applications.
Referring to fig. 5-7, fig. 5 is a schematic diagram of an assembling structure of the adhesive tape 6 shown in fig. 4, fig. 6 is a partially enlarged sectional view of the adhesive tape 6 a shown in fig. 5 of the first type, and fig. 7 is a partially enlarged sectional view of the adhesive tape 6 a shown in fig. 5 of the second type.
In the embodiment shown in fig. 5, the adhesive tape 6 further includes a base material layer 61, the inner side 611 of the base material layer 61 is adhered to the surface of the electrode assembly 2, the melting point of the base material layer 61 is lower than that of the heat-resistant layer 62, and/or the heat-resistant layer 62 has a heat conductivity lower than that of the base material layer 61, i.e., the heat-resistant layer 62 has high temperature resistance and/or high heat insulation performance. The heat-resistant layer 62 is disposed on the outer side 612 of the base material layer 61 facing away from the electrode assembly 2 to achieve a temperature separation effect by the heat-resistant layer 62 having a high melting point. The base material layer 61 is a body of the adhesive tape 6 having an adhesive function to be adhered to the surface of the electrode assembly 2 as a corresponding index adhesive tape. By providing the corresponding heat-resistant layer 62 on the side of the original substrate layer 61 facing away from the electrode assembly 2, i.e., the non-adhesive side of the substrate layer 61 and the electrode assembly 2, to obtain the adhesive tape 6 with high temperature resistance and/or high heat insulation performance, the contact time between the electrode assembly 2 and the casing 1 can be effectively delayed under the condition of realizing the identification and adhesive function of the adhesive tape 6, so that the thermal diffusion between the electrode assembly 2 and the casing 1 is reduced.
In some embodiments, the substrate layer 61 may be a body of the adhesive tape 6 with a marking function, such as a large-surface code-etching adhesive, and the material of the substrate layer may be a PET (polyethylene terephthalate ) material, where the thermal conductivity coefficient of the PET material ranges from 0.2 to 0.24, and the PET material can be used for bonding the electrode assembly 2, so as to prevent the separator from being scratched by the housing 1 when the electrode assembly 2 is put into the housing, and also play a role in information marking.
Since the inner side 611 of the base material layer 61 is bonded to the surface of the electrode assembly 2, the heat-resistant layer 62 is provided only on the outer side 612 of the base material layer 61 facing away from the electrode assembly 2 in order to reduce adverse effects on the normal bonding function of the base material layer 61, thereby achieving an insulating function and a temperature blocking function in the case of normal bonding.
In some embodiments, since the adhesive tape 6 is disposed between the electrode assembly 2 and the case 11, in the case of having the base material layer 61 and the heat-resistant layer 62, in order to achieve normal packaging, the thicknesses of the base material layer 61 and the heat-resistant layer 62 may be determined according to the volume parameters of the electrode assembly 2 and the volume parameters of the case 1. For example, the size of the space between the electrode assembly 2 and the case 11 may be determined according to the volume parameter of the electrode assembly 2 and the volume parameter of the case 11, and the thicknesses of the base material layer 61 and the heat-resistant layer 62 may be designed in a case where the size of the space is satisfied.
In the embodiment shown in FIG. 6, the thickness of the base material layer 61 is D 1,0.01mm≤D1. Ltoreq.0.5 mm. Considering that the adhesive tape 6 is adhered to the surface of the electrode assembly 2 and is disposed between the electrode assembly 2 and the case 1, in order to adapt to the space condition between the electrode assembly 2 and the case 1, D 1 is greater than or equal to 0.01mm, so that the substrate layer 61 has an effective material thickness, the problems of incapability of normal coating and easy deformation caused by too thin material are reduced, and D 1 is less than or equal to 0.5mm, so that adverse effects on normal lamination and battery packaging caused by too thick material are reduced. By properly designing the thickness of the base material layer 61, both the functionality and applicability of the base material layer 61 are compromised.
In the embodiment shown in FIG. 6, the thickness of the heat-resistant layer 62 is D 2,1μm≤D2≤300μm.D2. Gtoreq.1 μm, so that the heat-resistant layer 62 on the substrate layer 61 has an effective material thickness, and the situation that the temperature isolation effect is poor due to too thin material is reduced; and D 2 is less than or equal to 300 mu m, so that the heat-resistant layer 62 on the substrate layer 61 cannot influence the normal lamination of the adhesive tape 6 and the normal encapsulation of a battery due to too thick, and the functions and the applicability of the adhesive tape 6 are considered by reasonably designing the thicknesses of the substrate layer 61 and the heat-resistant layer 62.
In some embodiments, the heat resistant layer 62 is a coating disposed on the substrate layer 61.
The heat-resistant material and/or the heat-insulating material may be sprayed onto the base material layer 61 by means of spraying to obtain a uniform coating layer as the heat-resistant layer 62, thereby achieving a uniform temperature insulation effect. Illustratively, the heat resistant material and/or the thermal insulating material may be sprayed onto the outer side 612 of the substrate layer 61 by a spray process that may accommodate different substrate surfaces, and may be sprayed multiple times to achieve a desired coating thickness, with ease of use, ease of operation, and high efficiency. The outer side 612 of the substrate layer 61 may be pre-treated prior to spraying to reduce dust and other impurities on the outer side 612 of the substrate layer 61, thereby ensuring that the sprayed layer can be firmly adhered to the outer side 612 of the substrate layer 61, and then preparing a corresponding heat resistant material and/or heat insulating material for spraying. The spraying may be performed by direct spraying, rolling or brushing, and the specific choice depends on the shape and size of the substrate layer 61 and the desired thickness of the coating. After the spraying is completed, the heat resistant material and/or the heat insulating material on the outer side 612 of the substrate layer 61 may be naturally air-dried or baked to form a firm sprayed layer.
In the embodiment shown in fig. 7, the adhesive tape 6 is a heat-resistant layer 62 having an adhesive function. The adhesive tape 6 adhered to the outer surface of the electrode assembly 2 can be directly manufactured by using materials which are resistant to high temperature, have low thermal conductivity, can be directly contacted with the electrode assembly 2, such as various different types of heat-resistant materials and/or heat-insulating materials, so that the contact time of the electrode assembly 2 and the case 1 is delayed, and the thermal diffusion between the electrode assembly 2 and the case 1 is reduced.
In the embodiment shown in FIG. 7, the thickness of the tape 6 is D 3,0.01mm≤D3. Ltoreq.0.5 mm. In the case that the adhesive tape 6 is the heat-resistant layer 62 having the adhesive function, considering that the adhesive tape 6 is adhered to the surface of the electrode assembly 2 and is disposed between the electrode assembly 2 and the case 1, in order to adapt to the space condition between the electrode assembly 2 and the case 1, D 3 is not less than 0.01mm, so that the heat-resistant layer 62 has an effective material thickness, and the condition that the temperature isolation effect is poor due to too thin material is reduced; d 3 is less than or equal to 0.5mm, so that the normal lamination of the heat-resistant layer 62 cannot be influenced due to the fact that the thickness of the heat-resistant layer 62 is reasonably designed, and the functionality and the applicability of the adhesive tape 6 are considered.
Referring to fig. 5, in some embodiments, referring to the thickness direction X of the electrode assembly 2, the electrode assembly 2 includes a main body 22 and a tab 21, at least one end of the main body 22 along the first direction Y is provided with the tab 21, for example, in the first direction Y, an end of the main body 22 near the end cap 12 is provided with the tab 21, the adhesive tape 6 extends around an axis parallel to the first direction Y and is adhered to an outer surface of the main body 22, the extension length of the adhesive tape 6 is L 1, the maximum dimension of the main body 22 along the second direction Z is L 2, the second direction Z is perpendicular to the first direction Y, the main body 22 has a first outer surface 221, the first outer surface 221 is an outer surface with the largest area in the main body 22, and the first outer surface 221 is parallel to the first direction Y and the second direction Z, and 1.ltoreq.l 1/L2.1. The length of the corresponding adhesive tape 6 can be selected according to the actual length of the electrode assembly 2, and the poor heat insulation effect caused by the too short adhesive tape 6 and the waste of materials caused by the too long adhesive tape 6 can be effectively reduced, thereby realizing the better heat insulation effect under the condition of low cost.
With continued reference to FIG. 5, in some embodiments, the tape 6 has a maximum dimension L 3 and the main body 22 has a maximum dimension L 4,1.2≤L3/L4.ltoreq.2 along the first direction Y. The width of the corresponding adhesive tape 6 can be selected according to the actual width through the electrode assembly 2, and thus the poor heat insulation effect due to the too narrow adhesive tape 6 and the waste of material due to the too wide adhesive tape 6 can be effectively reduced, thereby achieving a good heat insulation effect at low cost.
In some embodiments, the heat resistant layer 62 may include at least one layer of heat resistant material and/or insulating material; the heat resistant material may include: ceramic material, plastic material or metal material with melting point of 150 deg.c or higher; the insulating material may include: ceramic material with heat conductivity less than 0.24, asbestos material, rock wool material, aerogel felt material. The heat-resistant layer 62 with a single-layer structure or the heat-resistant layer 62 with a multi-layer composite layer structure is manufactured by using various heat-resistant materials with higher melting points exceeding or equal to 150 ℃ and/or heat-insulating materials with lower heat conductivity, so that the stability of the heat-resistant layer 62 under the condition that the electrode assembly 2 generates high temperature is effectively improved, the temperature isolation function is realized, and the temperature protection effect is effectively improved.
In some embodiments, the respective heat resistant material and/or heat conductive material may be selected according to the conditions of the melting point, the heat conductivity coefficient, and whether or not the electrode assembly 2 can be directly contacted. The plastic material of the heat-resistant material may include: high temperature nylon PA46, PPA, PARA, PPS, polyaryletherketone (PAEK) type materials, polyimide (PI) type materials, polysulfone (PSU) type materials, polyarylate (PAR) type materials, liquid Crystal Polymer (LCP) materials, fluoroplastic type materials [ Polytetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer (ETFE), fluorinated Ethylene Propylene (FEP), polyvinylidene fluoride (PVDF) ] and the like, and the metal materials in the heat-resistant materials may include copper foil or aluminum foil and the like. The plastic material in the heat insulating material can comprise polyester, polyimide film, polyamide PA material, polyoxymethylene POM material, polyester PBT material, polycarbonate PC material, polyphenylene oxide PPO material and the like.
In some embodiments, if the heat-resistant layer 62 includes a metal material of the heat-resistant materials, the metal material of the heat-resistant materials may be disposed on a side of the heat-resistant layer 62 facing away from the electrode assembly 2 in order to provide the adhesive tape 6 with a corresponding insulation function, so that the adhesive tape 6 performs a normal insulation protection on the electrode assembly 2 while achieving a high temperature resistant function.
In some embodiments, if the heat-resistant layer 62 includes a heat-insulating material therein, in order to achieve better heat-insulating performance, the heat-insulating material may be disposed at a side of the heat-resistant layer 62 adjacent to the electrode assembly 2 to reduce a distance between the heat-insulating material and the electrode assembly 2, thereby improving the heat-insulating effect of the heat-resistant layer 62.
In some embodiments, the material thickness of each layer structure in the heat resistant layer 62 is D 4,0.003mm≤D4. Ltoreq.0.5 mm. In the case where the heat-resistant layer 62 has a composite multi-layer structure, the material thickness of each layer structure may be defined according to actual conditions to reasonably set the thickness of the heat-resistant layer 62, thereby reasonably setting the thickness of the adhesive tape 6, and controlling the thickness of the adhesive tape 6 while achieving high temperature resistance and/or high heat insulation performance to achieve normal battery assembly.
In the embodiment shown in fig. 5 to 7, the heat-resistant layer 62 may comprise a single-layer structure of one layer, and the heat-resistant layer 62 of a double-layer structure is obtained by combining with the base material layer 61 made of a PET material, for example, one layer of a PET material+one layer of a heat-resistant material, for example: PET+PI (Polyimide)), PET+ceramic, which may be PET+PFA (Polyfluoroalkoxy, polyvinyl fluoride copolymer), PET+aluminum foil, PET+copper foil, or a layer of PET material+a layer of heat insulating material; the heat-resistant layer 62 may also be a multi-layered composite structure, and the heat-resistant layer 62 having a three-layer or more structure is obtained by combining the substrate layer 61, for example, one layer of PET material+double-layer heat-resistant material, one layer of PET material+double-layer heat-insulating material, or one layer of PET material+one layer of heat-resistant material+one layer of heat-insulating material, and the types of materials selected for each layer may be the same or different. In some multi-layered composite structures, for example, in the case where the heat-resistant layer 62 includes one layer of heat-resistant material and/or heat-insulating material, then the adhesive tape 6 includes a double-layered structure of the base material layer 61 and one layer of functional material, the thickness D 5 of the functional material may be set according to the thickness D 1 of the base material layer 61, for example, 0.3.ltoreq.d 5/D1.ltoreq.0.7 may be set, for example, D 5 =0.15 mm may be set when the thickness D 1 =0.3 mm of the base material layer 61, to achieve an effective heat-insulating function and/or heat-resistant function. In the case where the heat-resistant layer 62 includes two layers of heat-resistant material and/or heat-insulating material, the adhesive tape 6 includes a three-layer structure composed of the base material layer 61 and two layers of functional material, and the thickness ratio range of the three-layer structure can be set to 1 within the thickness range of the original base material layer 61: 1:1, for example, the base material layer 61 is set to 0.16mm, a layer of heat insulating material is set to 0.16mm, a layer of heat resistant material is set to 0.16mm, and the like, to achieve an effective heat insulating function and/or heat resistant function.
In the embodiment shown in fig. 8, the heat-resistant layer 62 may include a single-layer structure of one layer, for example, be directly made of one layer of heat-resistant material or one layer of heat-insulating material, and the heat-resistant layer 62 may be a multi-layer composite structure, for example, a double-layer heat-resistant material, a double-layer heat-insulating material, one layer of heat-resistant material + one layer of heat-insulating material, three-layer heat-resistant material, three-layer heat-insulating material, double-layer heat-resistant material + one layer of heat-insulating material, or double-layer heat-insulating material + one layer of heat-resistant material, and the types of materials selected for each layer may be the same or different. In some embodiments, where the heat resistant layer 62 comprises a double or triple layer structure, each layer of heat resistant material and/or insulating material may be provided at the same thickness, i.e., the ratio of the thicknesses of each layer of heat resistant material and/or insulating material is 1:1, for example, in a two-layer structure, the thickness of each layer of heat-resistant material and/or heat-insulating material is set to 0.25mm, and in a three-layer structure, the thickness of each layer of heat-resistant material and/or heat-insulating material is set to 0.16mm, to achieve an effective heat-insulating function and/or heat-resistant function.
Referring to fig. 8, fig. 8 is a schematic diagram of a specific structure of the battery cell 10 shown in fig. 4, and in some embodiments, the adhesive tape 6 is provided with a marking portion 73. The identification portion 73 may have two-dimensional codes, cursor positioning or other types of identification information, where the identification information may include parameter information such as a model number, a specification, a production date of the electrode assembly 2, so as to identify relevant parameters of the electrode assembly 2, so as to facilitate subsequent verification, information acquisition, and other processes.
In some embodiments, the position and shape of the identifier 73 may be selected and modified according to the actual situation and specific requirements, and an example case where the identifier 73 is located on the side wall of the adhesive tape 6 and the identifier is circular is shown in fig. 5.
With continued reference to fig. 8, in some embodiments, the housing 1 includes a shell 11 and an end cap 12, the shell 11 having an opening, the end cap closing the opening; the battery cell further includes an insulating member 5, the insulating member 5 wrapping the electrode assembly 2, a tape 6 being disposed between a surface of the electrode assembly 2 and the insulating member 5, the insulating member 5 being configured to insulate the electrode assembly 2 from the case 11. The case 1 may include a case 11 having an opening and an end cap closing the opening to accommodate the electrode assembly 2. Also, an insulator may be provided between the case 11 and the electrode assembly 2 to insulate the electrode assembly 2.
In some embodiments, the insulating member 5 may include a wrapping structure wrapping the electrode assembly 2 and a pallet structure at the bottom of the electrode assembly 2.
With continued reference to fig. 8, in some embodiments, the insulating member 5 may be connected to the top case 11 by a blue gel 71, and the outside of the case 11 may be further provided with a blue film 72 to protect the case 11.
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 (14)
1. A battery cell, the battery cell comprising:
a housing;
an electrode assembly accommodated in the case;
an adhesive tape adhered to an outer surface of the electrode assembly;
Wherein the adhesive tape comprises a heat-resistant layer, the melting point of the heat-resistant layer is C, C is more than or equal to 150 ℃, and/or the heat conductivity coefficient of the heat-resistant layer is lambda, lambda is less than 0.24;
Wherein the housing comprises a shell and an end cap, the shell having an opening, the end cap closing the opening; the battery cell further includes an insulating member wrapping the electrode assembly, the adhesive tape being disposed between an outer surface of the electrode assembly and the insulating member, the insulating member being configured to insulate the electrode assembly from the case;
The adhesive tape further comprises a substrate layer, wherein the substrate layer is an adhesive tape body with an adhesive function, and the heat-resistant layer is a coating arranged on the substrate layer;
Or the adhesive tape is the heat-resistant layer with an adhesive function.
2. The battery cell according to claim 1, wherein an inner side surface of the base material layer is bonded to an outer surface of the electrode assembly, a melting point of the base material layer is lower than a melting point of the heat-resistant layer, and/or a thermal conductivity of the heat-resistant layer is lower than a thermal conductivity of the base material layer;
The heat-resistant layer is arranged on the outer side surface of the base material layer, which faces away from the electrode assembly.
3. The battery cell of claim 2, wherein the substrate layer has a thickness D 1,0.01mm≤D1 mm or less.
4. The battery cell of claim 2, wherein the heat resistant layer has a thickness D 2,1μm≤D2 ∈300 μm.
5. The battery cell according to claim 1, wherein if the adhesive tape is the heat-resistant layer having an adhesive function, the thickness of the adhesive tape is D 3,0.01mm≤D3 -0.5 mm.
6. The battery cell according to any one of claims 1 to 5, wherein the electrode assembly includes a main body portion and a tab provided at least one end of the main body portion in a first direction, the adhesive tape extends around an axis parallel to the first direction and is adhered to an outer surface of the main body portion, the adhesive tape has an extension length L 1, a maximum dimension of the main body portion in a second direction is L 2, the second direction is perpendicular to the first direction, the main body portion has a first outer surface which is an outer surface of the main body portion having the largest area, the first outer surface is parallel to the first direction and the second direction, and 1.ltoreq.l 1/L2.ltoreq.1.1.
7. The battery cell of claim 6, wherein the tape has a maximum dimension L 3 and the main body portion has a maximum dimension L 4,1.2≤L3/L4 ∈2 in the first direction.
8. The battery cell of any one of claims 1-5, wherein the heat resistant layer comprises at least one layer of a heat resistant material and/or a thermally insulating material;
The heat-resistant material includes: ceramic material, plastic material or metal material with melting point of 150 deg.c or higher;
the heat insulating material comprises: ceramic material with heat conductivity less than 0.24, asbestos material, rock wool material, aerogel felt material.
9. The battery cell of claim 8, wherein a metallic material of the heat resistant material is disposed on a side of the heat resistant layer facing away from the electrode assembly.
10. The battery cell of claim 8, wherein the thermal insulation material is disposed on a side of the heat resistant layer adjacent to the electrode assembly.
11. The battery cell of claim 8, wherein each layer of the heat resistant layer has a material thickness D 4,0.003mm≤D4 ∈0.5mm.
12. The battery cell of any one of claims 1-5, wherein the tape is provided with an identification portion.
13. A battery comprising a cell according to any one of claims 1-12.
14. A powered device comprising a battery cell as claimed in any one of claims 1-12, the battery cell being configured to provide electrical energy to the powered device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420516635.6U CN221057481U (en) | 2024-03-18 | 2024-03-18 | Battery monomer, battery and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420516635.6U CN221057481U (en) | 2024-03-18 | 2024-03-18 | Battery monomer, battery and electric equipment |
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| Publication Number | Publication Date |
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| CN202420516635.6U Active CN221057481U (en) | 2024-03-18 | 2024-03-18 | Battery monomer, battery and electric equipment |
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