CN220527166U

CN220527166U - Battery monomer, battery and power consumption device

Info

Publication number: CN220527166U
Application number: CN202321785746.9U
Authority: CN
Inventors: 杜香龙
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2024-02-23
Anticipated expiration: 2033-07-07

Abstract

The application provides a battery monomer, battery and power consumption device, belongs to battery technical field. The battery cell comprises a shell, an electrode assembly and a liquid storage piece. The housing is for containing an electrolyte. The electrode assembly is accommodated in the shell and comprises a main body part and a tab, and the tab is arranged at one end of the main body part. The liquid storage piece is arranged between the shell and the main body part, is configured to store electrolyte and is configured to release the electrolyte when the electrolyte is expanded and pressed by the main body part. The battery unit can reduce the electrolyte free in the shell, so that the risk of lithium precipitation of the electrode assembly caused by non-uniformity of the electrolyte in the shell can be reduced, and when the electrode assembly expands or the electrolyte is consumed in the subsequent use process of the battery unit, the electrolyte can be further supplemented by the liquid storage part, the distribution condition of the electrolyte in the shell can be regulated, and the phenomenon of insufficient infiltration or dry electrolyte of the electrode assembly can be relieved.

Description

Battery monomer, battery and power consumption device

Technical Field

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

Background

In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, a power battery plays an important role as a power source of the electric automobile. Along with the great popularization of new energy automobiles, the demand for power battery products is also growing, and batteries as core parts of the new energy automobiles have higher requirements on the use reliability. The battery cell generally includes a case and an electrode assembly received in the case, however, the existing battery cell has low reliability in use and a short service life.

Disclosure of Invention

The embodiment of the application provides a battery monomer, battery and power consumption device, can effectively promote battery monomer's reliability in use and life.

In a first aspect, embodiments of the present application provide a battery cell comprising a housing, an electrode assembly, and a reservoir; the shell is used for containing electrolyte; the electrode assembly is accommodated in the shell and comprises a main body part and a tab, and the tab is arranged at one end of the main body part; the liquid storage member is disposed between the housing and the body portion, and is configured to store the electrolyte and to release the electrolyte when the electrolyte is expanded and pressed by the body portion.

In the technical scheme, the liquid storage part is arranged in the shell, and is positioned between the shell and the main body part of the electrode assembly, so that the liquid storage part can absorb and store electrolyte in the shell, and can release the stored electrolyte when the main body part of the electrode assembly expands and extrudes the liquid storage part.

In some embodiments, the battery cell further comprises a first insulator; the first insulating piece is coated on the outer side of the main body part along the circumferential direction of the main body part and is used for separating the main body part and the shell; the liquid storage piece is arranged between the first insulating piece and the main body part.

In the above technical scheme, the battery cell is further provided with a first insulating member coated on the outer side of the main body part of the electrode assembly, so that the main body part and the housing can be insulated and isolated through the first insulating member, and the risk of short circuit between the electrode assembly and the housing can be reduced. In addition, through setting up the stock solution spare between first insulating part and main part, be convenient for assemble the stock solution spare on the one hand, on the other hand can realize stock solution spare and electrode assembly's main part direct contact, is favorable to in time supplementing electrode assembly's main part when stock solution spare releases electrolyte to can improve electrode assembly's electrolyte's infiltration effect.

In some embodiments, the reservoir extends circumferentially of the body portion.

In the above technical scheme, the liquid storage piece is arranged to be of a structure extending along the circumferential direction of the main body part, so that the liquid storage piece is arranged between the first insulating piece and the main body part, and the contact area between the liquid storage piece and the main body part is increased.

In some embodiments, the liquid storage member is wrapped around the outer side of the main body along the circumferential direction of the main body.

In the above-mentioned technical scheme, through setting up the stock solution spare into the structure in the outside of main part along the circumference cladding of main part for the stock solution spare is the structure that encircles main part setting, thereby can further increase the area of contact between stock solution spare and the main part on the one hand, be favorable to the stock solution spare to electrode assembly further supplement electrolyte and adjust the distribution condition of the electrolyte in the shell, and be convenient for the stock solution spare absorb and store the electrolyte that holds in the shell, on the other hand be convenient for assemble the stock solution spare to between first insulating part and the main part, be favorable to reducing the assembly degree of difficulty of stock solution spare.

In some embodiments, the battery unit includes a plurality of the liquid storage pieces, and the plurality of liquid storage pieces are arranged at intervals along the circumferential direction of the main body portion.

In the above technical scheme, through setting up a plurality of stock solutions spare between first insulating part and main part, and a plurality of stock solutions spare are arranged along the circumference interval of main part to can further increase the area of contact between stock solution spare and the main part, be favorable to the stock solution spare to further make up electrolyte and adjust the distribution condition of the electrolyte in the shell to the electrode assembly, and be convenient for the stock solution spare absorb and store the electrolyte that holds in the shell.

In some embodiments, the liquid storage member is connected to a surface of the first insulating member facing the main body portion.

In the above technical scheme, through connecting the stock solution spare on the one side that the first insulating part faces the main part, on the one hand can improve the structural stability and the firm nature of stock solution spare setting between first insulating part and main part, on the other hand is convenient for assemble the stock solution spare, can connect the stock solution spare on first insulating part earlier after, just can realize when cladding the outside of main part that the stock solution spare just can realize the stock solution spare and assemble between first insulating part and the main part, be favorable to optimizing battery monomer's takt of production, improve battery monomer's production efficiency.

In some embodiments, the reservoir is bonded to the first insulating member.

In the technical scheme, the liquid storage piece is connected to the first insulating piece by adopting the bonded structure, the structure is simple, the stability is high, the operation and the assembly are convenient, and the assembly difficulty between the liquid storage piece and the first insulating piece is reduced.

In some embodiments, the reservoir is an insulating material.

In the above technical scheme, through setting up the stock solution spare into insulating material for the stock solution spare can further play the effect of insulating isolation shell and electrode assembly's main part, in order to further reduce the risk of appearing the short circuit between shell and the electrode assembly.

In the above technical scheme, through setting up the stock solution spare into the structure in the outside of main part along the circumference cladding of main part for the stock solution spare is the structure that encircles main part setting, thereby can further increase the area of contact between stock solution spare and the main part, be favorable to the stock solution spare to electrode assembly further supplement electrolyte and adjust the distribution condition of the electrolyte in the shell, and be convenient for the stock solution spare absorb and store the electrolyte that holds in the shell.

In some embodiments, the liquid storage member is made of an insulating material, and the liquid storage member is used for separating the main body portion and the housing.

In the above technical scheme, through setting up the stock solution spare of cladding in the outside of electrode assembly's main part into insulating material for stock solution spare can also play insulating isolation's effect between shell and main part, thereby can reduce the risk of appearing the short circuit between shell and the electrode assembly, and then need not to independently wrap up insulating film isotructure in electrode assembly's outside again, is favorable to reducing battery monomer manufacturing cost, and can optimize battery monomer's production technology, in order to promote battery monomer's production efficiency.

In some embodiments, the reservoir is attached to an outer peripheral surface of the body portion.

In the above technical scheme, through connecting the stock solution spare on the outer peripheral face of main part to improve the structural stability and the firm nature of stock solution spare cladding in the outside of main part, be favorable to alleviating the stock solution spare and appear the phenomenon that drops in the use, thereby can promote the free stability in use and reliability of battery.

In some embodiments, the reservoir is bonded to the body portion.

In the technical scheme, the liquid storage part is connected to the main body part of the electrode assembly by adopting the bonded structure, so that the structure is simple, the stability is high, the operation and the assembly are convenient, and the assembly difficulty between the liquid storage part and the main body part of the electrode assembly is reduced.

In some embodiments, the main body portion has a cylindrical shape, and the tab is disposed at one end of the main body portion along an axial direction of the main body portion.

In the technical scheme, the main body part of the electrode assembly is of a cylindrical structure, so that the battery monomer of the cylindrical structure is conveniently formed by subsequent processing, and the battery monomer has the advantages of high capacity, long cycle life, wide use environment temperature and the like. In addition, the main body part of cylindric structure can extrude the stock solution spare better to electrode assembly is in the follow-up use through the stock solution spare and is replenished electrolyte.

In a second aspect, an embodiment of the present application further provides a battery, including the above battery cell.

In a third aspect, an embodiment of the present application further provides an electrical device, including the above battery cell, where the battery cell is used to provide electrical energy.

Drawings

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

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

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to some embodiments of the present disclosure;

FIG. 4 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

fig. 5 is a structural exploded view of a battery cell according to some embodiments of the present application;

fig. 6 is a top view of a battery cell reservoir coupled to an electrode assembly according to some embodiments of the present application;

fig. 7 is a top view of a battery cell reservoir coupled to an electrode assembly according to further embodiments of the present application;

fig. 8 is a top view of a battery cell reservoir coupled to an electrode assembly according to further embodiments of the present application;

fig. 9 is an exploded view of a battery cell according to other embodiments of the present application;

fig. 10 is a top view of a battery cell according to another embodiment of the present disclosure.

Icon: 1000-vehicle; 100-cell; 10-a box body; 11-a first tank body; 12-a second tank body; 20-battery cells; 21-a housing; 211-a housing; 2111-opening; 212-end caps; 22-electrode assembly; 221-a main body portion; 222-tab; 23-a reservoir; 24-a second insulator; 25-electrode terminals; 26-a pressure release mechanism; 27-a first insulating member; 200-a controller; 300-motor; x-a first direction; the Y-body portion is circumferential.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the 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. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present 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 and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

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

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

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

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

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

In this embodiment of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use.

The battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like, which is not limited in the embodiment of the present application.

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

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

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

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

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

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

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

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

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

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

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

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

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

In some embodiments, the separator is a separator film. The type of the separator may be various, and any known porous separator having good chemical stability and mechanical stability may be selected.

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. Wherein the 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.

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

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

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

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

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

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

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

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

In some embodiments, the electrode assembly 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 cells may be cylindrical battery cells, prismatic battery cells, pouch battery cells, or other shaped battery cells, including but not limited to square-case battery cells, blade-shaped battery cells, polygonal prismatic batteries, such as hexagonal-prismatic batteries, and the like.

Reference to a battery in embodiments 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 battery has the outstanding advantages of high energy density, small environmental pollution, large power density, long service life, wide application range, small self-discharge coefficient and the like, and is an important component of the development of new energy sources at present.

For a general battery cell, the battery cell generally includes a case, and an electrode assembly and an electrolyte, which are accommodated in the case, the electrolyte functioning to conduct ions between positive and negative electrodes of the electrode assembly, so as to realize input or output of electric energy of the battery cell. However, in the related art, the electrolyte is not uniformly distributed in the use process of the battery cell, so that the lithium is separated from the electrode assembly, so that the battery cell has a larger use risk, the use reliability of the battery cell is not improved, and the electrode assembly of the battery cell is expanded and the electrolyte in the shell is gradually consumed along with the use of the battery cell, so that the electrolyte is insufficient or is dried, and the service life of the battery cell is shorter.

Based on the above consideration, in order to solve the problems of low use reliability and short service life of the battery cell, the embodiment of the application provides a battery cell, and the battery cell comprises a housing, an electrode assembly and a liquid storage piece. The shell is used for containing electrolyte, and electrode assembly holds in the shell, and electrode assembly includes main part and utmost point ear, and the utmost point ear sets up in the one end of main part. The liquid storage piece is arranged between the shell and the main body part, is configured to store electrolyte and is configured to release the electrolyte when the electrolyte is expanded and pressed by the main body part.

In the battery monomer of this kind of structure, through setting up the stock solution spare in the shell, and the stock solution spare is located between the main part of shell and electrode assembly, make the stock solution spare can absorb and store the electrolyte in the shell, and the stock solution spare can release the electrolyte of storage when the main part of electrode assembly takes place the inflation extrusion stock solution spare, the liquid level of the inside electrolyte of battery monomer can be reduced to the battery monomer of adopting this kind of structure on the one hand, reduce the electrolyte of wanting in the shell, thereby can reduce the electrolyte in the shell and lead to the risk that the electrode assembly appears separating lithium because of inhomogeneous respectively, be favorable to improving the use reliability of battery monomer, on the other hand when electrode assembly inflation appears in the later use of battery monomer or electrolyte is consumed, the stock solution spare can further be supplemented and the distribution condition of the electrolyte in the adjustment shell, and timely replenishing the electrolyte in the electrode assembly, thereby can alleviate the phenomenon that the electrode assembly appears the infiltration is insufficient or electrolyte is dry, be favorable to improving the life of battery monomer.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. The power supply system with the battery monomer, the battery and the like disclosed by the application can be used, so that the problem that lithium precipitation or electrolyte infiltration is insufficient in the use process of the electrode assembly of the battery monomer is solved, and the use reliability and the service life of the battery monomer are improved.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present application 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 present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, at the head of the vehicle 1000, or at the rear 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 operation power source or a use power source of the vehicle 1000, or the like. 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 present application, battery 100 may not only be used as an operating power source or a utility power source for vehicle 1000, but may also be used as a drive power source for vehicle 1000 to provide drive power for vehicle 1000 instead of or in part instead of fuel oil or natural gas.

Referring to fig. 2 and 3, fig. 2 is a structural exploded view of a battery 100 according to some embodiments of the present application, and fig. 3 is a structural schematic diagram of a battery cell 20 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10.

The case 10 is used to provide an assembly space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first case body 11 and a second case body 12, the first case body 11 and the second case body 12 being covered with each other, the first case body 11 and the second case body 12 together defining an assembly space for accommodating the battery cell 20. The second box body 12 may have a hollow structure with one end opened, the first box body 11 may have a plate-shaped structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 define an assembly space together; the first tank body 11 and the second tank body 12 may each have a hollow structure with one side opened, and the open side of the first tank body 11 may be closed to the open side of the second tank body 12.

Of course, the case 10 formed by the first case body 11 and the second case body 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or a square, etc. Illustratively, in fig. 2, the case 10 is rectangular in shape.

In the battery 100, the number of battery cells 20 provided in the case 10 may be one or more. When the number of the battery cells 20 disposed in the case 10 is plural, the plurality of battery cells 20 may be connected in series or parallel or a series-parallel connection, and the series-parallel connection means that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are integrally accommodated in the case 10.

In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include a bus member for connecting the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, prism, or other shape, etc. Illustratively, in fig. 2, the battery cell 20 is of cylindrical configuration.

Referring to fig. 3 and further referring to fig. 4 and 5, fig. 4 is a partial cross-sectional view of a battery cell 20 according to some embodiments of the present application, and fig. 5 is a structural exploded view of the battery cell 20 according to some embodiments of the present application. The application provides a battery cell 20, the battery cell 20 includes a housing 21, an electrode assembly 22, and a reservoir 23. The housing 21 is for containing an electrolyte. The electrode assembly 22 is accommodated in the case 21, and the electrode assembly 22 includes a main body 221 and a tab 222, the tab 222 being disposed at one end of the main body 221. The liquid storage member 23 is disposed between the housing 21 and the main body 221, and the liquid storage member 23 is configured to store the electrolyte and to release the electrolyte when being expanded and pressed by the main body 221.

The case 21 is used for accommodating the electrolyte and the electrode assembly 22, etc., and the material of the case 21 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

In some embodiments, referring to fig. 3 and 5, the case 21 may include a case 211 in which a receiving chamber for receiving the electrode assembly 22 is formed at the inside of the case 211, and both ends of the receiving chamber in the first direction X are formed with openings 2111, that is, the case 211 is a hollow structure of both end openings 2111 in the first direction X, and two end caps 212 are respectively capped at the two openings 2111 of the case 211 and form a sealing connection to form a sealed space for receiving the electrode assembly 22 and an electrolyte. Of course, in other embodiments, the housing 21 may have other structures, for example, the housing 21 includes a housing 211 and an end cover 212, where the housing 211 is a hollow structure with an opening 2111 at one end, and the end cover 212 is covered at the opening 2111 of the housing 211.

In assembling the battery cell 20, the electrode assembly 22 may be placed in the case 211, and the case 211 may be filled with an electrolyte, and then the two end caps 212 may be respectively covered on the two openings 2111 of the case 211, so as to complete the assembly of the battery cell 20.

The housing 211 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure, etc. The shape of the case 211 may be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical-structured case 211 may be used. Of course, the structure of the end cap 212 may be various, for example, the end cap 212 may be a plate structure or a hollow structure with one end opened. Illustratively, in fig. 5, the housing 211 is a cylindrical structure and the end cap 212 is a plate-like structure.

The electrode assembly 22 is a member in which electrochemical reaction occurs in the battery cell 20, and the structure of the electrode assembly 22 may be various, and the electrode assembly 22 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or may be a laminated structure formed by laminating a positive electrode sheet, a separator, and a negative electrode sheet. Illustratively, in fig. 5, the electrode assembly 22 is a rolled structure formed by rolling a positive electrode sheet, a separator, and a negative electrode sheet, and the electrode assembly 22 has a cylindrical shape, and the axial direction of the electrode assembly 22 is the same as the first direction X. Of course, in other embodiments, the cross-section of the electrode assembly 22 perpendicular to the first direction X may also be elliptical, rectangular, or the like.

The separator is exemplified by a separator, and the separator may be made of at least one material selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

The electrode assembly 22 includes a main body 221 and a tab 222, the main body 221 is a region where the electrode assembly 22 chemically reacts in the battery cell 20, the main body 221 is a structure formed by winding a region where the positive electrode sheet is coated with a positive electrode active material layer, a separator, and a region where the negative electrode sheet is coated with a negative electrode active material layer, and mainly operates by means of metal ions moving between the positive electrode sheet and the negative electrode sheet with opposite polarities. The tab 222 is connected to one end of the body 221 in the first direction X, and the tab 222 is used to output or input electric power to or from the electrode assembly 22.

In fig. 5, the electrode assembly 22 includes two tabs 222, the polarities of the two tabs 222 are opposite, and the two tabs 222 are respectively used for outputting or inputting the positive and negative electrodes of the electrode assembly 22. If the tab 222 is used for inputting or outputting the positive electrode of the electrode assembly 22, the tab 222 is a component formed by mutually laminating and connecting areas of the positive electrode sheet, which are not coated with the positive electrode active material layer, and correspondingly, the other tab 222 is used for outputting or inputting the negative electrode of the electrode assembly 22; if the tab 222 is used to output or input the negative electrode of the electrode assembly 22, the tab 222 is a member formed by stacking and connecting regions of the negative electrode sheet, to which the negative electrode active material layer is not applied, and the other tab 222 is correspondingly used to input or output the positive electrode of the electrode assembly 22.

Illustratively, two tabs 222 are respectively connected to both ends of the main body 221 in the first direction X.

Optionally, the battery unit 20 may further include a second insulating member 24, where the second insulating member 24 is disposed in one-to-one correspondence with the tab 222, and the second insulating member 24 surrounds the outer side of the tab 222 along the circumferential direction Y of the main body portion so as to cover the tab 222, and the second insulating member 24 is used for separating the tab 222 from the housing 211 of the housing 21, so as to reduce the risk of shorting between the tab 222 and the housing 21.

The material of the second insulating member 24 may be rubber, silicone, plastic, or the like.

The reservoir 23 is disposed between the case 21 and the main body 221, that is, the reservoir 23 is disposed between the main body 221 of the electrode assembly 22 and the case 211 of the case 21.

The liquid storage member 23 is configured to store an electrolyte and is configured to release the electrolyte when the liquid storage member 23 is expanded and pressed by the main body portion 221, that is, the liquid storage member 23 can absorb and store the electrolyte contained in the housing 21, and can release the electrolyte stored in the liquid storage member 23 when the liquid storage member 23 is pressed by an external force, that is, the liquid storage member 23 is expanded and pressed by the main body portion 221 during use of the main body portion 221, and the electrolyte stored in the liquid storage member 23 can be extruded.

The liquid storage member 23 is made of a porous elastic material, so that the liquid storage member 23 can absorb and store electrolyte, and can release the electrolyte stored in the liquid storage member 23 when being extruded. For example, the liquid storage member 23 may be a porous elastic cotton or a porous rubber product or the like.

In some embodiments, the battery cell 20 may further include two electrode terminals 25, the polarities of the two electrode terminals 25 are opposite, the two electrode terminals 25 are respectively mounted on the two end caps 212 in an insulating manner, that is, no electrical connection is formed between the electrode terminals 25 and the housing 21, and each electrode terminal 25 is electrically connected to one tab 222, so as to achieve input or output of electric energy of the battery cell 20. Of course, in other embodiments, only one electrode terminal 25 may be provided in the battery cell 20, one tab 222 is electrically connected to the end cap 212 or the case 211 of the housing 21, and the other tab is electrically connected to the electrode terminal 25.

The electrode terminal 25 serves to output or input electric power from or to the battery cell 20, and may be made of various materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

In some embodiments, the battery cell 20 may further include a pressure relief mechanism 26, the pressure relief mechanism 26 being disposed on the housing 21. Alternatively, the pressure release mechanism 26 may be disposed on the end cap 212 of the housing 21, or may be disposed on the shell 211 of the housing 21, where the pressure release mechanism 26 is configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

The pressure release member and the housing 21 may be integrally formed, or may be separately provided. Illustratively, in fig. 5, the pressure relief member is configured to be separate from the housing 21, and the pressure relief member is mounted on one of the two end caps 212, and the pressure relief member may be a pressure relief member such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure relief valve, or a safety valve. Of course, in other embodiments, the pressure relief component may be formed integrally with the housing 21, where the pressure relief component is a weak structure formed on the end cover 212 or the housing 211, for example, where the pressure relief component is a scored groove formed on the end cover 212.

Through setting up stock solution spare 23 in shell 21, and stock solution spare 23 is located between the main part 221 of shell 21 and electrode assembly 22, make stock solution spare 23 can absorb and store the electrolyte in the shell 21, and when the main part 221 of electrode assembly 22 takes place the inflation extrusion stock solution spare 23, stock solution spare 23 can release the electrolyte of storage, the liquid level of the inside electrolyte of battery monomer 20 can be reduced to battery monomer 20 adopting this kind of structure on the one hand, reduce the electrolyte of freeing in shell 21, thereby can reduce the electrolyte in shell 21 and lead to the risk that electrode assembly 22 appears separating lithium because of inhomogeneous respectively, be favorable to improving the reliability in use of battery monomer 20, on the other hand when electrode assembly 22 inflation or electrolyte is consumed appear in the later use of battery monomer 20, stock solution spare 23 can further be replenished and adjust the distribution condition of electrolyte in the shell 21, and in time replenish the electrolyte in the electrode assembly 22, thereby can alleviate the phenomenon that electrode assembly 22 appears not enough or electrolyte dry out, be favorable to improving the life of battery monomer 20.

Referring to fig. 4 and 5, and further referring to fig. 6, fig. 6 is a top view of a battery cell 20 according to some embodiments of the present application, in which a reservoir 23 is connected to an electrode assembly 22. The battery cell 20 may further include a first insulating member 27. Along the circumferential direction Y of the main body, the first insulating member 27 is wrapped around the main body 221, the first insulating member 27 is used for separating the main body 221 and the housing 21, and the liquid storage member 23 is disposed between the first insulating member 27 and the main body 221.

The first insulating member 27 is wrapped around the outer side of the main body 221 along the circumferential direction Y of the main body, that is, the first insulating member 27 surrounds the outer circumferential side of the main body 221 around an axis extending in the first direction X.

The first insulating member 27 serves to insulate the main body 221 from the housing 211 of the casing 21, and the material of the first insulating member 27 may be various, such as rubber, silica gel, or plastic.

The liquid storage member 23 is disposed between the first insulating member 27 and the main body 221, that is, the liquid storage member 23 is located between the first insulating member 27 and the outer peripheral surface of the main body 221.

The battery cell 20 is further provided with a first insulating member 27 coated on the outside of the main body portion 221 of the electrode assembly 22 so that the main body portion 221 and the case 21 can be insulated by the first insulating member 27, whereby the risk of occurrence of short between the electrode assembly 22 and the case 21 can be reduced. In addition, by disposing the liquid storage member 23 between the first insulating member 27 and the main body 221, on one hand, assembly of the liquid storage member 23 is facilitated, and on the other hand, direct contact between the liquid storage member 23 and the main body 221 of the electrode assembly 22 can be realized, which is beneficial to timely replenishing the main body 221 of the electrode assembly 22 when the liquid storage member 23 releases the electrolyte, so that the electrolyte soaking effect of the electrode assembly 22 can be improved.

According to some embodiments of the present application, referring to fig. 5 and 6, the liquid storage member 23 extends along the circumferential direction Y of the main body portion. That is, the liquid storage member 23 is provided around the entire circumference or part of the main body 221.

Alternatively, the liquid storage member 23 disposed between the first insulating member 27 and the main body 221 may have various structures, for example, the liquid storage member 23 may be coated on the outer side of the main body 221 or may be coated on a part of the main body 221. Illustratively, in fig. 6, the liquid storage member 23 is disposed around the entire circumference of the main body 221, that is, the liquid storage member 23 is wrapped around the outside of the main body 221 along the circumferential direction Y of the main body. Of course, in other embodiments, the battery cell 20 may have other structures, and referring to fig. 7, fig. 7 is a top view of the battery cell 20 according to still other embodiments of the present application, in which the liquid storage member 23 is connected to the electrode assembly 22. The liquid storage member 23 is provided around a portion of the main body 221, that is, the liquid storage member 23 is wrapped around the portion of the main body 221 in the circumferential direction Y of the main body.

By providing the liquid storage member 23 in a structure extending in the circumferential direction Y of the main body portion, the liquid storage member 23 is disposed between the first insulating member 27 and the main body portion 221, and the contact area of the liquid storage member 23 and the main body portion 221 is advantageously increased.

According to some embodiments of the present application, referring to fig. 6, the liquid storage member 23 is wrapped around the outer side of the main body 221 along the circumferential direction Y of the main body.

Through setting up stock solution spare 23 to the structure of cladding in the outside of main part 221 along the circumference Y of main part for stock solution spare 23 is the structure of encircleing main part 221 setting, thereby can further increase the area of contact between stock solution spare 23 and the main part 221 on the one hand, be favorable to stock solution spare 23 to the further replenishment electrolyte of electrode assembly 22 and adjust the distribution condition of the electrolyte in the shell 21, and be convenient for stock solution spare 23 to holding the electrolyte in shell 21 and absorb and store, on the other hand be convenient for assemble stock solution spare 23 to between first insulating member 27 and the main part 221, be favorable to reducing the assembly degree of difficulty of stock solution spare 23.

In the embodiment in which the liquid storage member 23 covers the portion of the main body 221 in the circumferential direction Y of the main body, there may be one or more liquid storage members 23 disposed between the first insulating member 27 and the main body 221, and in fig. 7, there is only one liquid storage member 23 disposed between the first insulating member 27 and the main body 221. Referring to fig. 8, fig. 8 is a top view of a battery cell 20 according to further embodiments of the present application with a reservoir 23 attached to an electrode assembly 22, according to some embodiments of the present application. The battery cell 20 includes a plurality of liquid storage members 23, and the plurality of liquid storage members 23 are arranged at intervals along the circumferential direction Y of the main body portion.

Illustratively, in fig. 8, two liquid storage members 23 are disposed between the first insulating member 27 and the main body 221, and the two liquid storage members 23 are arranged at intervals along the circumferential direction Y of the main body, however, in other embodiments, three, four, five, six or the like liquid storage members 23 may be disposed between the first insulating member 27 and the main body 221.

Through setting up a plurality of stock solution pieces 23 between first insulating part 27 and main part 221, and a plurality of stock solution pieces 23 are arranged along the circumference Y interval of main part to can further increase the area of contact between stock solution piece 23 and the main part 221, be favorable to stock solution piece 23 to further supply electrolyte and adjust the distribution condition of the electrolyte in the shell 21 to electrode assembly 22, and be convenient for stock solution piece 23 absorb and store the electrolyte that holds in shell 21.

According to some embodiments of the present application, referring to fig. 4, 5 and 6, the liquid storage member 23 is connected to a surface of the first insulating member 27 facing the main body 221.

The liquid storage member 23 may be connected to the first insulating member 27 by various structures, for example, the liquid storage member 23 may be adhered to the first insulating member 27, or may be connected to the first insulating member 27 by a thermal fusion connection.

Through connecting stock solution piece 23 on the side that first insulating part 27 faced main part 221, on the one hand can improve structural stability and the firm nature of stock solution piece 23 setting between first insulating part 27 and main part 221, on the other hand is convenient for assemble stock solution piece 23, can connect stock solution piece 23 on first insulating part 27 earlier afterwards, just can realize when cladding the outside of main part 221 that stock solution piece 27 just can realize between stock solution piece 23 and main part 221 first insulating part 27, be favorable to optimizing the takt of battery unit 20, improve the production efficiency of battery unit 20.

In some embodiments, the reservoir 23 is bonded to the first insulating member 27.

Illustratively, the liquid storage member 23 may be adhered to the surface of the first insulating member 27 facing the main body 221 by glue or double-sided adhesive tape or the like.

The liquid storage piece 23 is connected to the first insulating piece 27 by adopting an adhesive structure, so that the structure is simple, the stability is high, the operation and the assembly are convenient, and the assembly difficulty between the liquid storage piece 23 and the first insulating piece 27 is reduced.

According to some embodiments of the present application, the liquid storage member 23 is made of an insulating material.

By way of example, the reservoir 23 may be a sponge, foam, or liquid absorbent cloth, etc.

By setting the liquid storage member 23 to be an insulating material, the liquid storage member 23 can further function as a main body 221 of the insulating and isolating housing 21 and the electrode assembly 22, so as to further reduce the risk of shorting between the housing 21 and the electrode assembly 22.

Referring to fig. 9 and 10, fig. 9 is an exploded view of the structure of a battery cell 20 according to other embodiments of the present application, and fig. 10 is a top view of a battery cell 20 according to other embodiments of the present application, in which a reservoir 23 is connected to an electrode assembly 22. Along the circumferential direction Y of the main body, the reservoir 23 is wrapped around the outside of the main body 221.

The liquid storage member 23 is wrapped around the outer side of the main body 221 along the circumferential direction Y of the main body, that is, the liquid storage member 23 is configured to surround the outer side of the main body 221 along the circumferential direction Y of the main body, so that the liquid storage member 23 is located between the main body 221 and the housing 211 of the casing 21.

Through setting up the stock solution piece 23 to the structure of cladding in the outside of main part 221 along the circumference Y of main part for the stock solution piece 23 is the structure of encircleing main part 221 setting, thereby can further increase the area of contact between stock solution piece 23 and the main part 221, be favorable to stock solution piece 23 to further supply electrolyte and adjust the distribution condition of the electrolyte in the shell 21 to electrode assembly 22, and be convenient for stock solution piece 23 to absorb and store the electrolyte that holds in shell 21.

In some embodiments, referring to fig. 9, the liquid storage member 23 is made of an insulating material, and the liquid storage member 23 is used to separate the main body 221 and the housing 21. In this embodiment, the battery cell 20 may not be provided with the first insulating member 27, and may function as a case 211 insulating and isolating the main body 221 of the electrode assembly 22 from the case 21 through the liquid storage member 23.

Through setting up the stock solution piece 23 of cladding in the outside of the main part 221 of electrode assembly 22 to insulating material for stock solution piece 23 can also play insulating isolation's effect between shell 21 and main part 221, thereby can reduce the risk that appears the short circuit between shell 21 and the electrode assembly 22, and then need not to independently wrap up insulating film isotructure in the outside of electrode assembly 22 again, is favorable to reducing the manufacturing cost of battery monomer 20, and can optimize the production technology of battery monomer 20, in order to promote the production efficiency of battery monomer 20.

In some embodiments, the reservoir 23 is attached to the outer peripheral surface of the body portion 221. The outer peripheral surface of the main body 221 is a surface of the main body 221 facing the housing 211 of the casing 21.

The liquid storage member 23 may be connected to the outer peripheral surface of the main body 221 in various manners, for example, the liquid storage member 23 may be adhered to the outer peripheral surface of the main body 221, or may be connected to the outer peripheral surface of the main body 221 by a heat-sealing connection.

Through connecting stock solution spare 23 on the outer peripheral face of main part 221 to improve the structural stability and the firm nature of stock solution spare 23 cladding in the outside of main part 221, be favorable to alleviating stock solution spare 23 and appear the phenomenon that drops in the use, thereby can promote battery cell 20's stability in use and reliability.

In some embodiments, the reservoir 23 is adhered to the body portion 221.

Illustratively, the liquid storage member 23 may be adhered to the outer circumferential surface of the main body 221 by glue, double-sided tape, or the like.

The liquid storage piece 23 is connected to the main body 221 of the electrode assembly 22 by adopting an adhesive structure, so that the structure is simple, the stability is high, the operation and the assembly are convenient, and the assembly difficulty between the liquid storage piece 23 and the main body 221 of the electrode assembly 22 is reduced.

According to some embodiments of the present application, referring to fig. 5 and 9, the body 221 is cylindrical, and the tab 222 is disposed at one end of the body 221 along the axial direction of the body 221.

The main body 221 is cylindrical, that is, the electrode assembly 22 is an electrode assembly 22 with a cylindrical structure, and the axial direction of the main body 221 is the same as the first direction X, and two tabs 222 are respectively connected to two ends of the main body 221 in the axial direction of the main body 221, and correspondingly, in the embodiment where the case 21 includes two end caps 212, the two end caps 212 are respectively located at two ends of the electrode assembly 22 in the first direction X.

By providing the body part 221 of the electrode assembly 22 in a cylindrical structure so as to facilitate the subsequent processing of the battery cell 20 forming the cylindrical structure, the battery cell 20 has the advantages of high capacity, long cycle life, wide use environment temperature, and the like. In addition, the cylindrical body part 221 can better squeeze the liquid storage member 23, so that the electrode assembly 22 can supplement electrolyte through the liquid storage member 23 in the subsequent use process.

According to some embodiments of the present application, there is also provided a battery 100, the battery 100 including the battery cell 20 of any one of the above aspects.

According to some embodiments of the present application, there is also provided an electrical device comprising the battery cell 20 of any of the above aspects, and the battery cell 20 is used to provide electrical energy to the electrical device.

The power utilization device may be any of the aforementioned devices or systems that employ the battery cells 20.

According to some embodiments of the present application, referring to fig. 3 to 6, there is provided a battery cell 20, the battery cell 20 including a case 21, an electrode assembly 22, a first insulating member 27, and a liquid storage member 23. The housing 21 is for containing an electrolyte. The electrode assembly 22 is accommodated in the case 21, the electrode assembly 22 includes a main body 221 and two tabs 222, the main body 221 is cylindrical, and an axis of the main body 221 extends along the first direction X, and the two tabs 222 are respectively disposed at two ends of the main body 221 in the first direction X. The first insulating member 27 is wrapped around the outside of the main body 221 along the circumferential direction Y of the main body, and the first insulating member 27 serves to separate the main body 221 and the housing 21. The liquid storage member 23 is disposed between the first insulating member 27 and the main body 221, and along the circumferential direction Y of the main body, the liquid storage member 23 is wrapped around the outer side of the main body 221, and the liquid storage member 23 is configured to store the electrolyte and to release the electrolyte when being expanded and pressed by the main body 221. The liquid storage member 23 is adhered to a surface of the first insulating member 27 facing the main body 221, and the liquid storage member 23 is made of an insulating material.

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

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing for containing an electrolyte;

an electrode assembly accommodated in the case, the electrode assembly including a body portion and a tab disposed at one end of the body portion; and

and a liquid storage member disposed between the housing and the body portion, the liquid storage member configured to store the electrolyte and configured to release the electrolyte when the electrolyte is expanded and pressed by the body portion.

2. The battery cell of claim 1, wherein the battery cell further comprises:

a first insulating member which is coated on the outer side of the main body part along the circumferential direction of the main body part, wherein the first insulating member is used for separating the main body part and the shell;

The liquid storage piece is arranged between the first insulating piece and the main body part.

3. The battery cell of claim 2, wherein the reservoir extends circumferentially of the body portion.

4. The battery cell according to claim 3, wherein the reservoir is coated on the outer side of the main body in the circumferential direction of the main body.

5. A battery cell according to claim 3, wherein the battery cell comprises a plurality of the liquid storage members, the plurality of liquid storage members being disposed at intervals along the circumferential direction of the main body portion.

6. The battery cell of claim 2, wherein the reservoir is attached to a surface of the first insulator facing the body portion.

7. The battery cell of claim 6, wherein the reservoir member is bonded to the first insulating member.

8. The battery cell of claim 2, wherein the reservoir is an insulating material.

9. The battery cell according to claim 1, wherein the reservoir is coated on the outer side of the main body portion in the circumferential direction of the main body portion.

10. The battery cell of claim 9, wherein the reservoir is an insulating material separating the body portion and the housing.

11. The battery cell of claim 9, wherein the reservoir is attached to an outer peripheral surface of the body portion.

12. The battery cell of claim 11, wherein the reservoir is bonded to the body portion.

13. The battery cell according to any one of claims 1 to 12, wherein the main body portion has a cylindrical shape, and the tab is provided at one end of the main body portion in an axial direction of the main body portion.

14. A battery comprising a cell according to any one of claims 1-13.

15. An electrical device comprising a cell according to any one of claims 1-13 for providing electrical energy.