CN112563560B - Battery cell, battery, electric device, and method for manufacturing battery cell - Google Patents

Battery cell, battery, electric device, and method for manufacturing battery cell Download PDF

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Publication number
CN112563560B
CN112563560B CN202110199429.8A CN202110199429A CN112563560B CN 112563560 B CN112563560 B CN 112563560B CN 202110199429 A CN202110199429 A CN 202110199429A CN 112563560 B CN112563560 B CN 112563560B
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China
Prior art keywords
clamping
bending
pole piece
battery
bent
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CN202110199429.8A
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Chinese (zh)
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CN112563560A (en
Inventor
上官会会
雷育永
唐代春
白子瑜
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Jiangsu Contemporary Amperex Technology Ltd
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Jiangsu Contemporary Amperex Technology Ltd
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Priority to CN202110199429.8A priority Critical patent/CN112563560B/en
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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • H01M10/0583Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • H01M10/0587Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The application relates to a battery monomer, a battery, an electric device and a manufacturing method of the battery monomer, and belongs to the technical field of batteries. The battery cell includes: the electrode assembly comprises a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece are wound or folded to form a bending area, the first pole piece comprises a first bending part located in the bending area, and the second pole piece comprises a second bending part located in the bending area; a clamp configured to clamp at least adjacent first and second bend portions to reduce a distance between the adjacent first and second bend portions. The single battery can reduce or avoid the phenomenon of lithium precipitation, and the safety of the single battery is improved.

Description

Battery cell, battery, electric device, and method for manufacturing battery cell
Technical Field
The application relates to the technical field of batteries, in particular to a battery cell, a battery, an electric device and a manufacturing method of the battery cell.
Background
The lithium ion battery as a rechargeable battery has the advantages of small volume, high energy density, high power density, more recycling times, long storage time and the like.
The lithium ion battery comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a first pole piece, a second pole piece and a separation film positioned between the first pole piece and the second pole piece.
The lithium separation is a common abnormal phenomenon of the lithium ion battery, the charging efficiency and the energy density of lithium ions can be influenced, lithium crystals can be formed when the lithium separation is serious, and the lithium crystals can pierce an isolating membrane to cause internal short circuit thermal runaway, so that the safety of the battery is seriously damaged.
Therefore, how to reduce or avoid lithium precipitation and improve the battery safety becomes a difficult problem in the industry.
Disclosure of Invention
The present application provides a battery cell, a battery, an electric device, and a method for manufacturing the battery cell, which can reduce or prevent the occurrence of a lithium deposition phenomenon and improve the safety of the battery cell.
The application is realized by the following technical scheme:
in one aspect, the present application provides a battery cell, including:
the electrode assembly comprises a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece are wound or folded to form a bending area, the first pole piece comprises a first bending part located in the bending area, and the second pole piece comprises a second bending part located in the bending area;
a clamp configured to clamp at least adjacent first and second bend portions to reduce a distance between the adjacent first and second bend portions.
According to the battery monomer of this application embodiment, through the clamping action of holder, reduced by the distance between the adjacent first kink of centre gripping and the second kink, lithium ion's transmission distance reduces, and based on the dynamics performance, lithium ion's migration ability improves, reduces or has avoided the emergence of the lithium phenomenon of analysing, has improved the free security of battery.
In some embodiments of the present application, the first pole piece and the second pole piece are wound to form a bending region, and the clamping member is configured to clamp at least the innermost adjacent first bending portion and the innermost adjacent second bending portion.
In the above scheme, because lithium is easily separated out to the innermost side of bending region, through the first kink and the second kink of holder centre gripping innermost side, reduced the interval of the adjacent first kink and the second kink of innermost side, can effectively reduce or avoid separating out the emergence of lithium phenomenon, guarantee the free security of battery.
In some embodiments of the present application, the clip includes a first clip portion and a second clip portion that are oppositely disposed, the first clip portion is configured to contact an inner circumferential surface of the bending region, and the second clip portion is configured to be interposed between the first bending portion and the second bending portion.
In the above scheme, the clamping piece clamps the innermost multilayer bent part of the bent area, so that the distance between the innermost multilayer bent parts can be reduced, and the occurrence of the lithium precipitation phenomenon of the innermost multilayer bent part of the bent area can be effectively reduced or avoided.
In some embodiments of the present application, the clamping member includes a first clamping portion and a second clamping portion, which are oppositely disposed, the first clamping portion is configured to abut against an inner circumferential surface of the bending region, and the second clamping portion is configured to abut against an outer circumferential surface of the bending region.
In the above scheme, the clamping piece clamps the whole bending area in the thickness direction of the bending area, so that the distance between two adjacent layers of bending parts in the bending area can be ensured to be smaller, and the occurrence of a lithium precipitation phenomenon is effectively reduced or avoided.
In some embodiments of the present application, the clamp includes a first clamp portion and a second clamp portion that are oppositely disposed, and the first clamp portion and the second clamp portion are integrally formed.
In the above scheme, adopt integrated into one piece's structure, the handling ease guarantees the bulk strength of holder, can also simplify the installation, improves production efficiency.
In some embodiments of the present application, the clamping member further includes a connecting portion, the first end of the first clamping portion is connected to the first end of the second clamping portion through the connecting portion, and the first clamping portion, the second clamping portion and the connecting portion are integrally formed.
In the above scheme, the connection transition of the first clamping part and the second clamping part is realized through the connecting part, the connection stability of the first clamping part and the second clamping part is ensured, the displacement of the first bending part and the second bending part between the first clamping part and the second clamping part is convenient to limit, the distance between the first bending part and the second bending part between the first clamping part and the second clamping part is reduced, the transmission distance of lithium ions is reduced, and the occurrence of a lithium precipitation phenomenon is reduced or avoided.
In some embodiments of the present application, the second end of the first clamping portion is detachably connected with the second end of the second clamping portion, so that the first clamping portion and the second clamping portion enclose a closed ring-shaped structure.
In the above scheme, first clamping part and second clamping part enclose into closed annular structure, guarantee that holder and electrode subassembly have better connection stability, prevent that the holder from moving for electrode subassembly.
In some embodiments of the present application, the clamp includes a first clamp portion and a second clamp portion disposed opposite each other, the first clamp portion and the second clamp portion being physically disposed and removably coupled.
In the scheme, the first clamping part and the second clamping part are arranged in a split manner, so that on one hand, the assembly is flexible and the replacement is convenient; on the other hand, the material use and the cost can be reduced by processing and production.
In some embodiments of the present application, the first end of the first clamping portion is detachably connected to the first end of the second clamping portion, and the second end of the first clamping portion is detachably connected to the second end of the second clamping portion, so that the first clamping portion and the second clamping portion form a closed ring structure.
In the above scheme, first clamping part and second clamping part enclose into closed annular structure, and convenient assembling guarantees that holder and electrode subassembly have better connection stability, prevents that the holder from removing for electrode subassembly.
In some embodiments of this application, the holder includes relative first clamping part and the second clamping part that sets up, and the one side of the orientation second clamping part of first clamping part is the first arc surface that suits with the bending zone, and the one side of the orientation first clamping part of second clamping part is the second arc surface that suits with the bending zone.
In the above scheme, through first arc surface and second arc surface and bending zone phase-match, guarantee first clamping part and bending zone laminating, second clamping part and bending zone laminating, guarantee the stability of being connected of holder and electrode subassembly on the one hand, on the other hand avoids damaging first kink and second kink, is convenient for reduce or avoid the emergence of separating out the lithium phenomenon.
In some embodiments of the present application, the clamp includes an aperture through which the clamp is configured to direct the electrolyte to the electrode assembly.
In the above scheme, the arrangement of the pores can store the electrolyte and guide the electrolyte to the electrode assembly so as to facilitate the infiltration of the electrode assembly.
On the other hand, the application also provides a battery, which comprises the battery cell.
In another aspect, the present application also provides an electric device, including the battery cell.
In another aspect, the present application also provides a method of manufacturing a battery cell, including:
providing an electrode assembly, wherein the electrode assembly comprises a first pole piece and a second pole piece, the first pole piece and the second pole piece form a bending area after being wound or folded, the first pole piece comprises a first bending part located in the bending area, and the second pole piece comprises a second bending part located in the bending area;
providing a clamping piece;
the clamping piece is used for clamping at least the adjacent first bending part and the second bending part so as to reduce the distance between the adjacent first bending part and the second bending part.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure;
fig. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of an assembled rolled electrode assembly and a clamping member according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of a folded electrode assembly and a clip according to an embodiment of the present application;
FIG. 6 is an enlarged schematic view of FIG. 5 at A;
FIG. 7 is a schematic view of the assembly of a clamping member and an electrode assembly according to an embodiment of the present application;
FIG. 8 is a schematic view of the assembly of a clamp and an electrode assembly according to another embodiment of the present application;
FIG. 9 is a schematic view of a clamp according to an embodiment of the present application;
FIG. 10 is a schematic view of a clamp according to another embodiment of the present application;
FIG. 11 is a schematic view of a clamp according to yet another embodiment of the present application;
FIG. 12 is a schematic view of a clamp according to yet another embodiment of the present application;
FIG. 13 is an enlarged view of FIG. 11 at B;
FIG. 14 is an enlarged view at C of FIG. 12;
FIG. 15 is a schematic view of the assembly of a clamp and electrode assembly according to yet another embodiment of the present application;
fig. 16 shows a schematic flow chart of a method of manufacturing a battery cell according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are used only for convenience in describing the present application and for simplification of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.
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. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.
The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the mass flow body protrusion on the anodal active substance layer of uncoated positive active substance layer is in the mass flow body of coating anodal active substance layer, and the mass flow body on the anodal active substance layer of uncoated positive is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative active material layer of uncoated negative active material layer, the mass flow body of uncoated negative active material layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene).
The isolating film has electronic insulativity and is used for isolating the adjacent positive pole piece and the negative pole piece and preventing the adjacent positive pole piece and the negative pole piece from being short-circuited. The isolating membrane has a large number of through micropores, can ensure that electrolyte ions can freely pass through, and has good permeability to lithium ions, so that the isolating membrane can not basically block the lithium ions from passing through.
In order to make the volume of the single lithium ion battery smaller and the energy density higher, a negative pole piece, a positive pole piece and a separation film in an electrode assembly of the single lithium ion battery can be wound or folded and then compacted. The electrode assembly comprises a straight area and bending areas positioned at two ends of the straight area, wherein the straight area is an area with a parallel structure in the electrode assembly, namely the surfaces of a negative pole piece, a positive pole piece and a separation film in the straight area are all planes. The bending area is an area with a bending structure in the electrode assembly, namely, the negative pole piece, the positive pole piece and the isolating membrane in the bending area are all bent, namely, the surfaces of each layer of negative pole piece, positive pole piece and isolating membrane of the electrode assembly in the bending area are all curved surfaces.
When a lithium ion battery cell is charged, lithium ions are extracted from a positive electrode plate and are inserted into a negative electrode plate, but some abnormal situations may occur, for example, the lithium insertion space of the negative electrode plate is insufficient, the distance between the negative electrode plate and the positive electrode plate is too large, the resistance of the lithium ions inserted into the negative electrode plate is too large, or the lithium ions are extracted from the positive electrode plate too fast, the extracted lithium ions cannot be equally inserted into a negative active material layer of the negative electrode plate, and the lithium ions which cannot be inserted into the negative electrode plate can only obtain electrons on the surface of the negative electrode plate, so that a silver-white metal lithium simple substance is formed, which is a lithium precipitation phenomenon. The lithium separation not only reduces the performance of the lithium ion battery monomer and greatly shortens the cycle life, but also limits the quick charge capacity of the lithium ion battery monomer. In addition, when lithium ion batteries generate lithium separation, the separated lithium metal is very active and can react with electrolyte at a lower temperature, so that the self-heat generation starting temperature of the battery monomer is reduced, the self-heat generation rate is increased, and the safety of the battery monomer is seriously damaged. Moreover, when the lithium is separated seriously, the lithium ions which are extracted can form lithium crystals on the surface of the negative pole piece, and the lithium crystals can easily puncture the isolating membrane, so that the adjacent positive pole piece and the negative pole piece have the risk of short circuit.
The inventor finds that the lithium separation phenomenon frequently occurs in the bending region of the electrode assembly, and through further research, the inventor finds that the reason for the lithium separation phenomenon is that after the electrode assembly is bent, the distance between two adjacent first pole pieces and two adjacent second pole pieces in the bending region is large, the transmission distance of lithium ions is large, the lithium ions are influenced by dynamic performance, the migration capacity of the lithium ions is reduced, and the lithium separation phenomenon easily occurs in the bending region.
In view of this, the application provides a technical scheme, through the clamping effect of holder, has reduced the distance between the first pole piece of part and the part second pole piece that is held by bending zone, and the transmission distance of lithium ion reduces, and based on the dynamics performance, the mobility of lithium ion improves, has reduced the emergence of the lithium phenomenon of educing, has improved the single safety of battery.
The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, for example, the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like.
It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may be applied to all devices using a battery, and for brevity of description, the following embodiments are all described by taking an electric vehicle as an example.
For example, fig. 1 shows a schematic structural diagram of a vehicle 1000 according to an embodiment of the present application, where the vehicle 1000 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The battery 100 is provided inside the vehicle 1000. For example, the battery 100 may be provided at the bottom or the head or 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 operation power supply of the vehicle 1000 for a circuit system of the vehicle 1000, for example, for power demand for operation in starting, navigation, and running of the vehicle 1000. In another embodiment of the present application, the battery 100 may be used not only as an operation power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving force for the vehicle 1000.
The motor 200 and the controller 300 may be further disposed inside the vehicle 1000, and the controller 300 is configured to control the battery 100 to supply power to the motor 200, for example, for starting, navigation and operation power demand during driving of the vehicle 1000.
In order to meet different power requirements, the battery 100 may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. The battery 100 may also be referred to as a battery pack. In some embodiments, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form the battery 100. That is, a plurality of battery cells may directly constitute the battery 100, or a battery module may be first constituted and then the battery 100 may be constituted.
Fig. 2 shows a schematic structural diagram of the battery 100 according to an embodiment of the present application. In fig. 2, the battery 100 may include a case 101 and a plurality of battery cells 10, where the case 101 has a hollow structure such that a receiving cavity is formed inside the case 101, and the plurality of battery cells 10 are received in the receiving cavity inside the case 101. The case 101 includes a first portion 1011 having an opening so that the plurality of battery cells 10 can be received in the first portion 1011 from the opening of the first portion 1011, and a second portion 1012 for coupling to the opening of the first portion 1011 to form the case 101 having a receiving chamber, the second portion 1012 being sealed after coupling to the first portion 1011.
Fig. 3 shows an exploded view of the battery cell 10 of an embodiment of the present application. Fig. 4 shows a schematic view of the assembly of the wound electrode assembly 11 and the holder 12 according to an embodiment of the present application. Fig. 5 shows a schematic view of the assembly of the electrode assembly 11 of the folded type and the holder 12 according to an embodiment of the present application. Fig. 6 is an enlarged schematic view of a portion a of fig. 5. In fig. 3 to 6, the battery cell 10 includes a case 13, an end cap 14, an electrode assembly 11 accommodated in the case 13, and a holder 12.
As shown in fig. 3, the case 13 has a receiving cavity, and the case 13 has an opening so that the electrode assembly 11 and the holder 12 can be received in the receiving cavity of the case 13; the end cap 14 is configured to close the opening of the housing 13; the end cap 14 and the case 13 are combined at the opening of the case 13 to form a hollow cavity, the electrode assembly 11 and the holder 12 are accommodated in the case 13, and the case 13 is filled with an electrolyte.
The case 13 is determined according to the shape of the one or more electrode assemblies 11 after being assembled, and for example, the case 13 may be a hollow rectangular parallelepiped or a hollow cube or a hollow cylinder. For example, when the housing 13 is a hollow rectangular parallelepiped or cube, an end surface of the housing 13 is opened so that the inside and outside of the housing 13 are the same.
In some embodiments of the present application, the housing 13 may be made of a material of conductive metal or plastic, alternatively, the housing 13 is made of aluminum or aluminum alloy.
Fig. 7 is a schematic view illustrating the assembly of the clamping member 12 and the electrode assembly 11 according to an embodiment of the present disclosure. In some embodiments of the present application, as shown in fig. 6 and 7, the electrode assembly 11 includes a first pole piece 111, a second pole piece 112, and a separation film 113, the first pole piece 111, the second pole piece 112, and the separation film 113 are wound or folded to form a bending region 114, the first pole piece 111 includes a first bending portion 1111 located in the bending region 114, and the second pole piece 112 includes a second bending portion 1121 located in the bending region 114. The clamping member 12 is configured to clamp at least the adjacent first bent portion 1111 and the second bent portion 1121 to reduce a distance between the adjacent first bent portion 1111 and the second bent portion 1121. The first pole piece 111 and the second pole piece 112 are two pole pieces with opposite polarities, for example, the first pole piece 111 is a negative pole piece, and the second pole piece 112 is a positive pole piece.
As shown in fig. 7, the first pole piece 111, the second pole piece 112, and the separation film 113 may be stacked to form a winding structure around a winding axis, for example, a winding structure of a flat body; as shown in fig. 5, the first pole piece 111, the second pole piece 112, and the separator 113 may be continuously folded in a zigzag shape after being laminated, and the electrode assembly 11, whether formed by winding or continuously folded in a zigzag shape, includes a straight region 115 and a bent region 114 connecting both ends of the straight region 115.
According to the single battery 10 of the embodiment of the application, the distance between the clamped first bending portion 1111 and the clamped second bending portion 1121 is reduced by the clamping action of the clamping member 12, the transmission distance of lithium ions is reduced, the migration capability of the lithium ions is improved based on the dynamic performance, the occurrence of the lithium precipitation phenomenon is reduced or avoided, and the safety of the single battery 10 is improved.
For simplicity, the first pole piece 111 is used as a negative pole piece, and the second pole piece 112 is used as a positive pole piece.
In some embodiments of the present application, as shown in fig. 6 and 7, the clamping member 12 includes a first clamping portion 121 and a second clamping portion 122 disposed opposite to each other, a clamping area 124 is formed between the first clamping portion 121 and the second clamping portion 122, and the clamping area 124 is configured to accommodate at least a first bending portion 1111 and a second bending portion 1121 adjacent to each other, so as to reduce a distance between the first bending portion 1111 and the second bending portion 1121 adjacent to each other, which is defined in the clamping area 124 by the first clamping portion 121 and the second clamping portion 122. It is understood that the first clamping portion 121 and the second clamping portion 122 are oppositely disposed in the thickness direction of the bending region 114. Note that the thickness direction of the bending region 114 refers to the stacking direction of the first bent portion 1111 and the second bent portion 1121 in the bending region 114, and may also be understood as the thickness direction of the first pole piece 111 or the second pole piece 112 in the bending region 114.
Fig. 8 shows a schematic view of the assembly of the holder 12 and the electrode assembly 11 according to another embodiment of the present application. In some embodiments of the present application, the first pole piece 111 and the second pole piece 112 are wound to form a bending region 114, and the clamping member 12 is configured to clamp at least the innermost adjacent first bent portion 1111 and the second bent portion 1121, for example, as shown in fig. 8, the clamping member 12 is configured to clamp the innermost adjacent first bent portion 1111 and the second bent portion 1121, and for example, as shown in fig. 7, the clamping member 12 is configured to clamp all the bent portions (the first bent portion 1111 and the second bent portion 1121) of the bending region 114. It can be appreciated that the clip 12 at least limits the distance between the first bend 1111 and the second bend 1121 at the innermost side of the bend region 114. Compared with the distance between the first bent portion 1111 and the second bent portion 1121 at the outermost side of the bent region 114, the distance between the first bent portion 1111 and the second bent portion 1121 at the innermost side of the bent region 114 is larger, so that a lithium deposition phenomenon is easily caused, the clamping member 12 at least clamps the first bent portion 1111 and the second bent portion 1121 at the innermost side, so that the distance between the adjacent first bent portion 1111 and the second bent portion 1121 at the innermost side is reduced, the transmission distance of lithium ions is reduced, the occurrence of the lithium deposition phenomenon can be effectively reduced or avoided, and the safety of the single battery 10 is ensured.
It is noted that the electrode assembly 11 is wound to form a wound structure, and the innermost side refers to a side of the wound structure close to the winding axis, and the outermost side refers to a side of the wound structure facing away from the winding axis.
In some embodiments of the present application, as shown in fig. 8, the first clamping portion 121 is configured to contact with an inner circumferential surface of the bending region 114, and the second clamping portion 122 is configured to be inserted between the first bending portion 1111 and the second bending portion 1121. It can be understood that, the part of the bent portion of the bending region 114 clamped by the clamping member 12, that is, the innermost multi-layer bent portion of the bending region 114 clamped by the clamping member 12, can reduce the distance between the innermost multi-layer bent portions, reduce the transmission distance of lithium ions in this region, and effectively reduce or avoid the occurrence of the lithium deposition phenomenon at the innermost side of the bending region 114.
In some embodiments of the present application, as shown in fig. 8, an even-numbered layer of bent portions is sandwiched between the first clamping portion 121 and the second clamping portion 122, which can be understood as an even-numbered layer of bent portions contained in the clamping region 124. When the even number of layers of bent portions are clamped by the clamping member 12, the bent portion located at the innermost side of the bent portion 114 is the first bent portion 1111 in one case, and the bent portion located at the innermost side of the bent portion 114 is the second bent portion 1121 in the other case. For example, as shown in fig. 8, the bending portion located at the innermost side of the bending region 114 is a first bending portion 1111, and the first pole piece 111 is a negative pole piece; the clamping area 124 contains two layers of bent parts (one layer of first bent part 1111 and one layer of second bent part 1121), the first clamping part 121 is located at the innermost side of the winding structure and contacts with one surface of the innermost first bent part 1111 near the winding axis; the second bending portion 1121 of the clamping region 124 is in contact with a surface of the second clamping portion 122 facing away from the winding axis. In the above embodiment, when the second clamping portion 122 is located between the second bent portion 1121 and the first bent portion 1111, the distance between the first bent portion 1111 and the second bent portion 1121 on the innermost side of the bent region 114 is reduced, and the distance between the second bent portion 1121 and the first bent portion 1111 on both sides of the second clamping portion 122 is increased, but since the ratio of the negative electrode active material to the positive electrode active material is sufficiently large, the increase of the distance between the second bent portion 1121 and the first bent portion 1111 on both sides of the second clamping portion 122 has negligible effect on the lithium deposition phenomenon, and for the entire electrode assembly 11, the clamping effect of the clamping member 12 can effectively reduce the occurrence of the lithium deposition phenomenon on the innermost side of the bent region 114, and thus the occurrence of the lithium deposition phenomenon of the battery cell 10.
In some embodiments of the present application, as shown in fig. 6 and 7, the first clamping portion 121 is configured to abut against an inner circumferential surface of the bending region 114, and the second clamping portion 122 is configured to abut against an outer circumferential surface of the bending region 114. It can be understood that, the clamping area 124 accommodates all the bent portions in the thickness direction of the bent area 114, so that the distance between two adjacent bent portions of the bent area 114 can be ensured to be small, and the occurrence of the lithium deposition phenomenon can be effectively reduced or avoided.
It should be noted that the inner peripheral surface of the bending region 114 refers to a surface of the bending region 114 close to the winding axis or the bending axis, and the outer peripheral surface of the bending region 114 refers to a surface of the bending region 114 away from the winding axis or the bending axis, that is, the inner peripheral surface and the outer peripheral surface of the bending region 114 are two opposite surfaces in the thickness direction of the bending region 114, respectively, and it can be understood that the inner peripheral surface of the bending region 114 and the outer peripheral surface of the bending region 114 are both curved surfaces.
FIG. 9 is a schematic view of a clamp 12 according to an embodiment of the present disclosure; fig. 10 is a schematic structural view of a clamping member 12 according to another embodiment of the present application.
In some embodiments of the present application, as shown in fig. 9 and 10, the first clamping portion 121 and the second clamping portion 122 are integrally formed. Adopt integrated into one piece's structure, the handling ease guarantees the bulk strength of holder 12, can also simplify the installation, improves production efficiency.
In some embodiments of the present application, as shown in fig. 9 and 10, the clamping member 12 further includes a connecting portion 123, the first end 1211 of the first clamping portion is connected with the first end 1221 of the second clamping portion by the connecting portion 123, and the first clamping portion 121, the second clamping portion 122 and the connecting portion 123 are integrally formed. The connection transition of the first clamping portion 121 and the second clamping portion 122 is realized through the connection portion 123, the connection stability of the first clamping portion 121 and the second clamping portion 122 is ensured, the displacement of the first bending portion 1111 and the second bending portion 1121 in the clamping area 124 is convenient to be limited, the distance between the adjacent first bending portion 1111 and the second bending portion 1121 in the clamping area 124 is reduced, the transmission distance of lithium ions is reduced, and the occurrence of a lithium precipitation phenomenon is reduced or avoided.
It is understood that the first and second clamping parts 121 and 122 extend in a direction parallel to the winding axis or bending axis of the electrode assembly 11; a first end 1211 of the first clamping portion and a second end 1212 of the first clamping portion are opposite ends of the first clamping portion 121 in a direction parallel to a winding axis or a bending axis of the electrode assembly 11, and a first end 1221 of the second clamping portion and a second end 1222 of the second clamping portion are opposite ends of the second clamping portion 122 in a direction parallel to the winding axis or the bending axis of the electrode assembly 11; the first end 1211 of the first clamping portion corresponds to the first end 1221 of the second clamping portion, and the second end 1212 of the first clamping portion corresponds to the second end 1222 of the second clamping portion.
The clamp 12 described in the above embodiments may be either an open structure or a closed structure.
For example, as shown in fig. 9, the clamping member 12 may have a U-shaped structure, and the second end 1212 of the first clamping portion and the second end 1222 of the second clamping portion are free ends, so that the clamping member 12 has an open structure, which facilitates quick assembly of the clamping member 12 and the electrode assembly 11, saves time, and improves production efficiency.
In some embodiments of the present application, when the clamping member 12 is an open structure, as shown in fig. 9, a side of the first clamping portion 121 facing the second clamping portion 122 may be arched, and a side of the second clamping portion 122 facing the first clamping portion 121 may be arched, so as to reduce the space of the clamping area 124. When the clamping member 12 is engaged with the electrode assembly 11, the clamping member 12 is facilitated to clamp the multi-layer bent portion located in the clamping region 124, so as to reduce the distance between the adjacent first bent portion 1111 and the second bent portion 1121, thereby ensuring that the clamping member 12 has a better clamping effect and preventing the clamping member 12 from moving relative to the multi-layer bent portion.
For another example, as shown in fig. 10, the second end 1212 of the first clamping portion is detachably connected to the second end 1222 of the second clamping portion, so that the first clamping portion 121 and the second clamping portion 122 enclose a closed ring-shaped structure.
In some embodiments of the present application, as shown in fig. 10, the second end 1212 of the first clamping portion is provided with a first clamping portion 1213, the second end 1222 of the second clamping portion is provided with a second clamping portion 1223, and the first clamping portion 1213 is clamped with the second clamping portion 1223. One of the first clamping portion 1213 and the second clamping portion 1223 may be a hook, and the other may be a buckle; or both the first clamping portion 1213 and the second clamping portion 1223 are hooks. For example, in fig. 10, the first end 1211 of the first clamping portion, the first end 1221 of the second clamping portion, and the connecting portion 123 are integrally formed; the first clamping portion 1213 is a first clamping hook formed at the second end 1212 of the first clamping portion and extending toward the second clamping portion 122; the second clamping portion 1223 is a second hook for engaging with the first hook, and the second hook is formed at the second end 1222 of the second clamping portion and extends toward the first clamping portion 121. When the first hook and the second hook are engaged, the first hook and the second hook are constrained to each other, so as to limit the displacement of the second end 1212 of the first clamping portion relative to the second end 1222 of the second clamping portion, and further reduce the distance between the first bending portion 1111 and the second bending portion 1121 in the clamping region 124. By reducing the distance between the first clamping part 121 and the second clamping part 122, for example, pressing the first clamping part 121 toward the second clamping part 122, the first hook and the second hook can be disengaged, facilitating the assembly and disassembly of the clamping member 12 and the electrode assembly 11.
In other embodiments of the present application, the second end 1212 of the first clamping portion and the second end 1222 of the second clamping portion may be sleeved with each other, or may be connected with each other by other fixing members (e.g., bolts, screws, pins, etc.). The first clamping portion 121 and the second clamping portion 122 enclose a closed ring structure, so that the clamping member 12 and the electrode assembly 11 have good connection stability, and the clamping member 12 is prevented from moving relative to the electrode assembly 11.
FIG. 11 is a schematic view of a clamp 12 according to another embodiment of the present application; FIG. 12 is a schematic view of a clamp 12 according to yet another embodiment of the present application; fig. 13 is an enlarged schematic view of fig. 11 at B.
In some embodiments of the present application, as shown in fig. 11 and 12, the first clamping portion 121 and the second clamping portion 122 are separately provided and detachably connected. The first clamping part 121 and the second clamping part 122 are arranged separately, so that on one hand, the assembly is flexible, and the replacement is convenient; on the other hand, the material use and the cost can be reduced by processing and production.
As shown in fig. 11 and 12, the first end 1211 of the first clamping portion is detachably connected to the first end 1221 of the second clamping portion, and the second end 1212 of the first clamping portion is detachably connected to the second end 1222 of the second clamping portion, so that the first clamping portion 121 and the second clamping portion 122 enclose a closed ring-shaped structure. The first clamping portion 121 and the second clamping portion 122 enclose a closed ring structure, so that the assembly is convenient, the clamping member 12 and the electrode assembly 11 are ensured to have better connection stability, and the clamping member 12 is prevented from moving relative to the electrode assembly 11.
In some embodiments of the present application, the second end 1212 of the first clamping portion is provided with a first clamping portion 1213, the second end 1222 of the second clamping portion is provided with a second clamping portion 1223, and the first clamping portion 1213 is clamped with the second clamping portion 1223; the first end 1211 of the first clamping portion is provided with a third clamping portion 1214, the first end 1221 of the second clamping portion is provided with a fourth clamping portion 1224, and the third clamping portion 1214 is clamped with the fourth clamping portion 1224. One of the first clamping portion 1213 and the second clamping portion 1223 may be a hook, and the other may be a buckle; alternatively, the first clamping portion 1213 and the second clamping portion 1223 are both clamping hooks; further alternatively, one of the first clamping portion 1213 and the second clamping portion 1223 is a male buckle, and the other is a female buckle. One of the third clamping portion 1214 and the fourth clamping portion 1224 can be a hook, and the other can be a buckle; or the third clamping portion 1214 and the fourth clamping portion 1224 are both clamping hooks; alternatively, one of the third clamping portion 1214 and the fourth clamping portion 1224 is a male buckle, and the other is a female buckle.
For example, as shown in fig. 11, the first clamping portion 1213 is a first hook, the second clamping portion 1223 is a second hook for cooperating with the first hook, the third clamping portion 1214 is a third hook, and the fourth clamping portion 1224 is a fourth hook for cooperating with the third hook; the first clamping portion 121 and the second clamping portion 122 are both C-shaped. The first hook is formed at the second end 1212 of the first clamping portion and extends toward the second clamping portion 122, and the third hook is formed at the first end 1211 of the first clamping portion and extends toward the second clamping portion 122; the second hook is formed at the second end 1222 of the second clamping portion and extends toward the first clamping portion 121, and the fourth hook is formed at the first end 1221 of the second clamping portion and extends toward the first clamping portion 121. When the first hook is engaged with the second hook and the third hook is engaged with the fourth hook, the first hook and the second hook are constrained to each other and the third hook and the fourth hook are constrained to each other, so as to limit the displacement of the first clamping portion 121 relative to the second clamping portion 122, and further reduce the distance between the first bending portion 1111 and the second bending portion 1121 in the clamping area 124.
By pressing the first clamping portion 121 and the second clamping portion 122 in the thickness direction of the bending region 114, the first hook and the second hook can be separated, the third hook and the fourth hook can be separated, and the assembly and disassembly of the clamping member 12 and the electrode assembly 11 are facilitated. In the above embodiment, the first clamping portion 121 and the second clamping portion 122 may have different structures, as shown in fig. 11, the second clamping portion is located below the first clamping portion, the fourth clamping portion is located above the third clamping portion, and the first clamping portion and the second clamping portion have a better limiting effect in a direction parallel to the winding axis or the bending axis; the first clamping portion 121 and the second clamping portion 122 can also have the same structure, so that the processing and the manufacturing are convenient, the manufacturing cost is reduced, and the replacement is convenient.
For another example, as shown in fig. 12, the first clamping portion 1213 is a first male buckle, the second clamping portion 1223 is a first female buckle for cooperating with the first male buckle, the third clamping portion 1214 is a second male buckle, and the fourth clamping portion 1224 is a second female buckle for cooperating with the second male buckle; the first clamping portion 121 has a C-shaped structure, and the second clamping portion 122 has a rod-shaped structure. The first male snap is formed at the second end 1212 of the first clamping portion and extends toward the second clamping portion 122, the first female snap is formed at the second end 1222 of the second clamping portion, the second male snap is formed at the first end 1211 of the first clamping portion and extends toward the second clamping portion 122, and the second female snap is formed at the first end 1221 of the second clamping portion. For example, fig. 14 is an enlarged view at C of fig. 12, and as shown in fig. 12 and 14, the first male buckle and the second male buckle may have arrow-head-like structures, and when the first male buckle and the first female buckle are engaged, the first male buckle and the first female buckle are constrained with each other, so as to limit the displacement of the second end 1212 of the first clamping portion and the second end 1222 of the second clamping portion; when the second male buckle and the second female buckle are buckled, the second male buckle and the second female buckle are constrained with each other, and the displacement of the first end 1211 of the first clamping part and the first end 1221 of the second clamping part is limited. As shown in fig. 14, taking the first male buckle as an example, each male buckle includes a male buckle body 1251, two hooks 1252, and a buffer groove 1253 is provided between the two hooks 1252 to allow the two hooks 1252 to deform. In an initial state, the two hooks 1252 are parallel to each other, and when the two hooks 1252 are pressed, the two hooks 1252 approach each other, so that the two hooks 1252 can enter the corresponding female buckle or exit from the corresponding female buckle. When the first male buckle and the first female buckle are released from being buckled or the second male buckle and the second female buckle are buckled, the first male buckle or the second male buckle needs to be squeezed to deform the first male buckle or the second male buckle so as to be separated from the first female buckle or the second female buckle.
It should be noted that all the hooks in fig. 10 and 11 of the above embodiments may have the same structure, for example, taking the first and second catching portions 1213 and 1223 as an example, as shown in fig. 13, the first catching portion 1213 includes a first body portion 1213a, a first recess portion 1213b, and a first hooking portion 1213c, the first body portion 1213a includes a first face 1213d and a second face 1213e that are oppositely disposed in a direction parallel to the winding axis or the bending axis, the first face 1213d is configured to be located on a face of the first body portion 1213a facing away from the electrode assembly 11, the second face 1213e is configured to be located on a face of the first body portion 1213a facing the electrode assembly 11, the first recess portion 1213b is located at an end of the first body portion 1213a in the thickness direction of the bending region 114, the first recess portion 1213b is formed by the first face 1213d being recessed toward the second face 1213e, and the first hooking portion 1213c is formed at the first recess portion 1213b and at an end of the first recess portion 1213 b. The second clamping portion 1223 includes a second body portion 1223a, a second recessed portion 1223b, and a second hooking portion 1223c, the second body portion 1223a includes a third face 1223d and a fourth face 1223e oppositely disposed along a direction parallel to the winding axis or the bending axis, the third face 1223d is configured to be located on a face of the second body portion 1223a facing away from the electrode assembly 11, the fourth face 1223e is configured to be located on a face of the second body portion 1223a facing the electrode assembly 11, the second recessed portion 1223b is located at an end of the second body portion 1223a along the thickness direction of the bending region 114, the second recessed portion 1223b is formed by the fourth face 1223e being recessed toward the third face 1223d, the second hooking portion 1223c is formed on the second recessed portion 1223b and located at an end of the second recessed portion 1223b, and the second hooking portion 1223c of the second clamping portion 1223 is oppositely disposed with the first hooking portion 1213c of the first clamping portion 1213.
When the first engaging portion 1213 engages with the second engaging portion 1223, the first hooking portion 1213c hooks with the second hooking portion 1223c and restricts the separation of the two along the thickness direction of the bending region 114. In this case, the first surface 1213d of the first clip portion 1213 is coplanar with the third surface 1223d of the second clip portion 1223, and the second surface 1213e of the first clip portion 1213 is coplanar with the fourth surface 1223e of the second clip portion 1223, so as to reduce the space occupied by the first clip portion 1213 and the second clip portion 1223.
When the first hooking portion 1213c and the second hooking portion 1223c need to be separated, the first clamping portion 121 and the second clamping portion 122 are extruded along the thickness direction of the bending region 114, the overlapping area of the first recess portion 1213b and the second recess portion 1223b is increased, the first hooking portion 1213c and the second hooking portion 1223c are gradually separated, and the first hooking portion 1213c is moved out of the second recess portion 1223b, so that the first engaging portion 1213c and the second engaging portion 1223c can be separated.
In the above embodiment, the first clamping portion 121 and the second clamping portion 122 can be detachably connected by a sleeve, for example, the first end 1211 of the first clamping portion is sleeved outside the first end 1221 of the second clamping portion, and the second end 1212 of the first clamping portion is sleeved outside the second end 1222 of the second clamping portion; other fasteners (such as bolts, screws, pins, etc.) may also be used.
Fig. 15 shows a schematic view of the assembly of the holder 12 and the electrode assembly 11 according to yet another embodiment of the present application. In some embodiments of the present application, as shown in fig. 15 and 8, a surface of the first clamping portion 121 facing the second clamping portion 122 is a first arc surface 1215 corresponding to the bending region 114, and a surface of the second clamping portion 122 facing the first clamping portion 121 is a second arc surface 1225 corresponding to the bending region 114. It can be understood that the first arc surface 1215 is attached to the bending portion contacting with the first clamping portion 121, so that the first clamping portion 121 and the bending portion have a larger contact area; the second arc surface 1225 is attached to the bent portion contacting with the second clamping portion 122, so that the second clamping portion 122 and the bent portion have a larger contact area. Through first arc surface 1215 and second arc surface 1225 and bending region 114 phase-match, guarantee first clamping part 121 and bending region 114 laminating, second clamping part 122 and bending region 114 laminating, guarantee the stability of being connected of holder 12 and electrode assembly 11 on the one hand, on the other hand avoids damaging first kink 1111 and second kink 1121, is convenient for reduce or avoid the emergence of the lithium phenomenon of educing.
In some embodiments of the present application, as shown in fig. 15, when the second clamping portion 122 is configured to be inserted between the first bent portion 1111 and the second bent portion 1121, a surface of the second clamping portion 122 facing away from the first clamping portion 121 is a third arc surface 1226 corresponding to the bent area 114. It can be understood that the second clamping portion 122 can be attached to the adjacent first bending portion 1111 and the second bending portion 1121 to reduce the occupied space, and at the same time, the bending portion can be prevented from being damaged, so as to reduce or prevent the occurrence of the lithium deposition phenomenon.
In some embodiments of the present application, the clamping member 12 includes an aperture (not shown in the drawings), and the clamping member 12 is configured to guide the electrolyte to the electrode assembly 11 through the aperture. The pores are provided to store and guide the electrolyte to the electrode assembly 11 to facilitate wetting of the electrode assembly 11. For example, the holder 12 may achieve the guidance of the electrolyte using a capillary phenomenon.
In some embodiments of the present application, the clip 12 is made of plastic or insulating material to avoid short circuit. Meanwhile, the selection of the above materials needs to consider the high temperature resistance, and the high temperature resistance is selected as much as possible to exceed 80 ℃, and also can be selected to have certain thermal conductivity, so as to reduce the internal temperature of the electrode assembly 11. For example, plastic such as PE (polyethylene), PP (polypropylene), PTFE (polytetrafluoroethylene), PA (Polyamide), and PET (polyethylene terephthalate) may be used for the holder 12, and ceramic, rubber, or the like may be used for the holder 12.
When the clamp 12 clamps the partially bent portion of the bent region 114, the clamp 12 is configured to separate the electrode assembly 11 and the end cap 14. For example, in a direction parallel to the winding axis or bending axis of the electrode assembly 11, one end of the clamping member 12 is configured to contact the end cap 14, e.g., the first end 1211 of the first clamping portion and the first end 1221 of the second clamping portion contact the end cap 14, both to space the electrode assembly 11 from the end cap 14 and to fix the position of the electrode assembly 11 and to protect the electrode assembly 11.
When the clamping member 12 clamps the entire bending region 114, the clamping member 12 is configured to separate the electrode assembly 11 from the case 13. For example, one end of the holder 12 is arranged to be in contact with the end cap 14 in a direction parallel to the winding axis or bending axis of the electrode assembly 11, and the second holding portion 122 of the holder 12 is located between the electrode assembly 11 and the case 13 in the thickness direction of the bending region 114. The clamping piece 12 can play a role in insulation and isolation, and can also realize the fixation of the electrode assembly 11 and protect the electrode assembly 11.
An embodiment of the present application further provides an electric device, which may include the battery cell 10 in the foregoing embodiments. In some embodiments, the powered device may be a vehicle 1000, a watercraft, or a spacecraft.
Having described the battery cell 10, the battery 100, and the electric device of the embodiment of the present application, a method of manufacturing the battery cell 10 of the embodiment of the present application will be described below, and portions not described in detail may be referred to the foregoing embodiments.
Fig. 16 shows a schematic flowchart of a method of manufacturing the battery cell 10 according to an embodiment of the present application. As shown in fig. 16, the method may include:
401, providing an electrode assembly 11, where the electrode assembly 11 includes a first pole piece 111 and a second pole piece 112, the first pole piece 111 and the second pole piece 112 are wound or folded to form a bending region 114, the first pole piece 111 includes a first bending portion 1111 located in the bending region 114, and the second pole piece 112 includes a second bending portion 1121 located in the bending region 114;
402, providing a clamp 12;
403, the clamping member 12 at least clamps the adjacent first bending portion 1111 and the second bending portion 1121 to reduce the distance between the adjacent first bending portion 1111 and the second bending portion 1121.
It should be noted that the above steps illustrate a method for manufacturing a battery cell provided in the embodiments of the present application, where the sequence of the steps "401, providing the electrode assembly 11", "402, and providing the clamping member 12" is not exclusive, and may be adjusted, for example, the steps "402, providing the clamping member 12", "401, and providing the electrode assembly 11" are performed sequentially.
It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced, but the modifications or the replacements do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (14)

1. A battery cell, comprising:
the electrode assembly comprises a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece are wound or folded to form a bending area, the first pole piece comprises a first bending part located in the bending area, and the second pole piece comprises a second bending part located in the bending area;
a clamp configured to clamp at least the first and second adjacent bend portions to reduce a distance between the first and second adjacent bend portions.
2. The battery cell according to claim 1, wherein the first and second pole pieces are wound to form a bent region, and the clamping member is configured to clamp at least the innermost adjacent first and second bent portions.
3. The battery cell according to claim 2, wherein the clamping member includes a first clamping portion and a second clamping portion that are disposed opposite to each other, the first clamping portion is configured to contact an inner circumferential surface of the bending region, and the second clamping portion is configured to be inserted between the first bending portion and the second bending portion.
4. The battery cell as recited in claim 1, wherein the clamping member comprises a first clamping portion and a second clamping portion that are disposed opposite to each other, the first clamping portion is configured to abut against an inner circumferential surface of the bending region, and the second clamping portion is configured to abut against an outer circumferential surface of the bending region.
5. The battery cell as recited in claim 1, wherein the clamping member comprises a first clamping portion and a second clamping portion disposed opposite to each other, and the first clamping portion and the second clamping portion are integrally formed.
6. The battery cell as recited in claim 5, wherein the clamping member further comprises a connecting portion through which a first end of the first clamping portion is connected with a first end of the second clamping portion, and the first clamping portion, the second clamping portion and the connecting portion are integrally formed.
7. The battery cell as recited in claim 6 wherein the second end of the first clamping portion is removably coupled to the second end of the second clamping portion such that the first clamping portion and the second clamping portion define a closed loop configuration.
8. The battery cell as recited in claim 1, wherein the clamping member comprises a first clamping portion and a second clamping portion that are oppositely disposed, and the first clamping portion and the second clamping portion are separately disposed and detachably connected.
9. The battery cell as recited in claim 8 wherein the first end of the first clamping portion is removably coupled to the first end of the second clamping portion and the second end of the first clamping portion is removably coupled to the second end of the second clamping portion such that the first clamping portion and the second clamping portion define a closed loop configuration.
10. The battery cell according to claim 1, wherein the clamping member includes a first clamping portion and a second clamping portion that are disposed opposite to each other, a surface of the first clamping portion facing the second clamping portion is a first arc surface corresponding to the bending region, and a surface of the second clamping portion facing the first clamping portion is a second arc surface corresponding to the bending region.
11. The battery cell of claim 1, wherein the clamp includes an aperture, the clamp configured to direct electrolyte to the electrode assembly through the aperture.
12. A battery comprising a cell according to any one of claims 1 to 11.
13. An electric device comprising a battery cell according to any one of claims 1 to 11.
14. A method of manufacturing a battery cell, comprising: providing an electrode assembly, wherein the electrode assembly comprises a first pole piece and a second pole piece, the first pole piece and the second pole piece are wound or folded to form a bending area, the first pole piece comprises a first bending part located in the bending area, and the second pole piece comprises a second bending part located in the bending area;
providing a clamping piece;
and clamping at least the adjacent first bent part and the second bent part by the clamping piece so as to reduce the distance between the adjacent first bent part and the second bent part.
CN202110199429.8A 2021-02-23 2021-02-23 Battery cell, battery, electric device, and method for manufacturing battery cell Active CN112563560B (en)

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