WO2024087957A1 - 卷绕式电芯、电池、电池组件及用电装置 - Google Patents

卷绕式电芯、电池、电池组件及用电装置 Download PDF

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Publication number
WO2024087957A1
WO2024087957A1 PCT/CN2023/120176 CN2023120176W WO2024087957A1 WO 2024087957 A1 WO2024087957 A1 WO 2024087957A1 CN 2023120176 W CN2023120176 W CN 2023120176W WO 2024087957 A1 WO2024087957 A1 WO 2024087957A1
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WIPO (PCT)
Prior art keywords
anode
cathode
winding
tabs
tab
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PCT/CN2023/120176
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English (en)
French (fr)
Inventor
蒋嘉丽
毛国安
严涵
陈悦飞
曹俊琪
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2024087957A1 publication Critical patent/WO2024087957A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of battery technology, and in particular to wound cells, batteries, battery assemblies and electrical devices.
  • the battery cell of a secondary battery is the main component that affects the electrochemical performance of a secondary battery.
  • a wound battery cell is formed by winding a cathode electrode sheet, an anode electrode sheet, and a diaphragm, and at least one pole ear is provided on the cathode electrode sheet and the anode electrode sheet, respectively.
  • some wound batteries use multiple pole ears on the cathode electrode sheet and the anode electrode sheet, respectively.
  • the main technical problem to be solved by the present application is that there are too many layers of the electrode ears of the wound battery cell, which leads to the problem of interlayer cold welding between the electrode ears and the conductive connection welding joints of the battery cell.
  • a wound battery cell comprising:
  • the main body includes a cathode electrode sheet, an anode electrode sheet and a separator; the separator is stacked between the cathode electrode sheet and the anode electrode sheet; the main body is wound around a virtual axis to form a flat winding body; the main body includes a plurality of winding parts along the winding direction; the winding part includes a cathode winding part, an anode winding part and a separator winding part;
  • the pole ear part is connected to one side of the main body part, and includes a plurality of cathode pole ears and a plurality of anode pole ears;
  • each cathode winding part in a part of the cathode winding parts is connected to a cathode ear, and one side of each cathode winding part in another part of the cathode winding parts is connected to two cathode ears; the two cathode ears of each cathode winding part in another part of the cathode winding parts are located on opposite sides of the virtual axis along the thickness direction of the main body; and/or,
  • each anode winding in a portion of the anode windings is connected to an anode tab, and the other portion of the anode windings is connected to an anode tab.
  • One side of each anode winding in the pole windings is connected to two anode tabs; the two anode tabs of each anode winding in the other part of the anode windings are located on opposite sides of the virtual axis along the thickness direction of the main body.
  • one side of each cathode winding in a portion of the cathode windings is connected to a cathode tab, and one side of each cathode winding in another portion of the cathode windings is connected to two cathode tabs; and one side of each anode winding in a portion of the anode windings is connected to an anode tab, and one side of each anode winding in another portion of the anode windings is connected to two anode tabs.
  • each cathode winding portion in a portion of the cathode winding portions is connected to a cathode ear
  • one side of each cathode winding portion in another portion of the cathode winding portions is connected to two cathode ears
  • the two cathode ears of each cathode winding portion in another portion of the cathode winding portions are axially symmetrically arranged along the thickness direction of the main body
  • each anode winding portion is connected to an anode ear.
  • each anode winding portion in a portion of the anode winding portions is connected to an anode ear
  • one side of each anode winding portion in another portion of the anode winding portions is connected to two anode ears
  • the two anode ears of each anode winding portion in another portion of the anode winding portions are axially symmetrically arranged along the thickness direction of the main body
  • each cathode winding portion is connected to a cathode ear.
  • each cathode winding portion in the first half of the cathode winding portions is connected to two cathode tabs, and one side of each cathode winding portion in the second half of the cathode winding portions is connected to one cathode tab; and/or,
  • each anode winding part in the first half of the anode winding parts is connected to two anode tabs, and one side of each anode winding part in the second half of the anode winding parts is connected to one anode tab.
  • each cathode winding part in the odd-numbered turns of the cathode winding part is connected to two cathode pole ears, and one side of each cathode winding part in the even-numbered turns of the cathode winding part is connected to one cathode pole ear; or, one side of each cathode winding part in the odd-numbered turns of the cathode winding part is connected to one cathode pole ear, and one side of each cathode winding part in the even-numbered turns of the cathode winding part is connected to two cathode pole ears; and/or,
  • each anode winding part in the odd-numbered turns is connected to two anode lugs, and one side of each anode winding part in the even-numbered turns is connected to one anode lug; or, one side of each anode winding part in the odd-numbered turns is connected to one anode lug, and one side of each anode winding part in the even-numbered turns is connected to two anode lugs.
  • the cathode electrode sheet includes a cathode current collector and a cathode active material layer disposed on one side of the cathode current collector;
  • the anode electrode sheet includes an anode current collector and an anode active material layer disposed on one side of the anode current collector;
  • cathode tab One end of the cathode tab is connected to the cathode current collector of the corresponding cathode winding part, and the other end is away from the cathode current collector along the virtual axis; one end of the anode tab is connected to the anode current collector of the corresponding anode winding part, and the other end is away from the anode current collector along the virtual axis; along the thickness direction of the main body, multiple cathode tabs located on the same side of the virtual axis are stacked, and multiple anode tabs located on the same side of the virtual axis are stacked.
  • the thickness of the cathode tab is the same as the thickness of the cathode current collector; the thickness of the anode tab is the same as the thickness of the anode current collector.
  • the stacked cathode tabs are equal length tabs or gradually Variable length tabs; in the direction of the virtual axis, the multiple stacked anode tabs are equal length tabs or gradually variable length tabs.
  • the multiple cathode pole ears arranged in a stacked manner are equal-length pole ears, and the length of the cathode pole ears is 28% to 29% of the width of the cathode winding portion connected to the cathode pole ears; the multiple anode pole ears arranged in a stacked manner are equal-length pole ears, and the length of the anode pole ears is 28% to 29% of the width of the anode winding portion connected to the anode pole ears.
  • the plurality of cathode tabs arranged in a stacked manner are tabs of gradually varying lengths, wherein the maximum length of the cathode tab is 28% to 29% of the width of the cathode winding portion connected to the cathode tab, and the minimum length of the cathode tab is 19% to 20% of the width of the cathode winding portion connected to the cathode tab; the lengths of the plurality of cathode tabs arranged in a stacked manner decrease layer by layer in an equidistant size from the inner circle to the outer circle;
  • the multiple anode tabs arranged in a stacked manner are tabs of gradual length.
  • the maximum length of the anode tab is 28% to 29% of the width of the anode winding portion connected to the anode tab, and the minimum length of the anode tab is 19% to 20% of the width of the anode winding portion connected to the anode tab; the lengths of the multiple anode tabs arranged in a stacked manner decrease layer by layer in an equidistant size from the inner circle to the outer circle.
  • the width of the cathode tab at one end away from the cathode current collector is 10% to 12.5% of the circumference of the innermost winding portion of the flat winding body, and the width of the cathode tab at one end connected to the cathode winding portion is 11% to 14% of the circumference of the innermost winding portion of the flat winding body.
  • the flat winding body has a length direction and a width direction; the virtual axis is parallel to the width direction; the width of the anode electrode piece is greater than the width of the cathode electrode piece, and the length of the anode electrode piece is greater than the length of the cathode electrode piece.
  • the innermost circle of the flat-shaped wound body is a partial anode winding portion; and the outermost circle of the flat-shaped wound body is a partial anode winding portion.
  • one side of each cathode winding in the cathode winding part is connected to one or two cathode tabs; one side of each anode winding part in the anode winding part is connected to one or two anode tabs; or,
  • each cathode winding part in the cathode winding part is connected to one or two cathode tabs; in the anode winding part, the innermost anode winding part or the outermost anode winding part is not provided with an anode tab, and one side of the other anode winding parts is connected to one or two anode tabs.
  • a battery comprising any of the above-mentioned wound battery cells.
  • a battery assembly including the above battery.
  • an electrical device comprising the above battery assembly.
  • the present invention connects one cathode tab/anode tab on one side of each cathode tab/anode tab in a part of the cathode winding part/anode winding part, and connects two cathode tabs/anode tabs on one side of each cathode tab/anode winding part in another part of the cathode winding part/anode winding part.
  • the number of cathode tabs/anode tabs is increased, and the flow area of the wound battery cell is improved.
  • FIG1 is a schematic diagram of the structure of a wound battery cell provided by the present application.
  • FIG2 is a schematic top view of the wound battery cell provided in FIG1 ;
  • FIG3 is a schematic structural diagram of a pole piece and a diaphragm of a wound battery cell provided in FIG1 ;
  • Fig. 4a is a partial cross-sectional view of the wound battery core provided in Fig. 2 along line A-A;
  • Fig. 4b is a partial cross-sectional view of the wound battery core provided in Fig. 2 along line B-B;
  • Fig. 5a is a second partial cross-sectional view of the wound battery core provided in Fig. 2 along line A-A;
  • FIG5 b is a second partial cross-sectional view of the wound battery core provided in FIG2 along line B-B;
  • FIG6 is a schematic top view of a second embodiment of a wound battery cell provided by the present application.
  • FIG7 is a schematic top view of a third embodiment of a wound battery cell provided in the present application.
  • FIG8 is a schematic top view of a fourth embodiment of a wound battery cell provided by the present application.
  • FIG9 is a schematic top view of a fifth embodiment of a wound battery cell provided in the present application.
  • FIG10 is a schematic top view of a sixth embodiment of a wound battery cell provided in the present application.
  • FIG11 is a schematic diagram of the structure of a battery provided by the present application.
  • FIG12 is a schematic diagram of the structure of a battery assembly provided by the present application.
  • FIG13 is a schematic diagram of the structure of the electrical device provided in the present application.
  • 100-wound battery cell 10-main body, 11-cathode pole piece, 12-anode pole piece, 13-diaphragm, Y-virtual axis, H-thickness of the main body, X-axis perpendicular to the thickness direction of the main body and perpendicular to the direction of the virtual axis, 101-wound part, 101a-cathode winding part, 101b-anode winding part, 101c-diaphragm winding part, 20-ear part, 21-cathode ear, 22-anode ear, 11a-cathode current collector, 11b-cathode active material Layer, 12a-anode current collector, 12b-anode active material layer, L-length of cathode/anode tab, W-width of cathode/anode winding portion, K1-width of cathode/anode tab away from one end of cathode/anode current collector, K
  • first”, “second”, “third” in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.
  • the features defined as “first”, “second”, “third” can expressly or implicitly include at least one of the features.
  • the meaning of “multiple” is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
  • all directional indications (such as up, down, left, right, front, back%) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly.
  • the flow area of the battery cell is the product of the sum of the thickness of the multi-layer tabs and the width of the tabs.
  • the thickness of the substrate should be as thin as possible.
  • the number of tab layers can only be increased or the width of the tabs can be widened.
  • the tab misalignment may interfere with the lower plastic under the explosion-proof valve, and there is a risk of the tab lapped with the lower plastic (under the high temperature cycle conditions of the battery cell, the lower plastic will soften and deform, and the tab lapped with the lower plastic may directly contact the battery explosion-proof valve, causing a short circuit, and the risk of battery fire is greatly increased), or it may be misaligned to the right, which may interfere with the injection hole and cause the risk of clogging the injection hole. Therefore, increasing the number of tab layers is an optional way to meet the requirements of the flow area. However, the number of tab layers cannot be increased indefinitely. It is necessary to avoid the problem of interlayer cold welding between the tabs of the battery cell and the conductive connection welding joints when the number of tab layers is increased.
  • Figure 1 is a structural schematic diagram of the wound battery cell provided in the present application
  • Figure 2 is a top view schematic diagram of the wound battery cell provided in Figure 1
  • Figure 3 is a structural schematic diagram of the electrode sheet and diaphragm of the wound battery cell provided in Figure 1
  • Figure 4a is a partial cross-sectional view of the wound battery cell provided in Figure 2 along the A-A line
  • Figure 4b is a partial cross-sectional view of the wound battery cell provided in Figure 2 along the B-B line.
  • an embodiment of the present application provides a wound battery cell 100 , including a main body portion 10 and a tab portion 20 .
  • the main body 10 includes a cathode electrode sheet 11, an anode electrode sheet 12 and a diaphragm 13.
  • the diaphragm 13 is stacked between the cathode electrode sheet 11 and the anode electrode sheet 12.
  • the main body 10 is wound around a virtual axis Y to form a flat winding body.
  • the main body 10 includes a plurality of windings 101 along the winding direction.
  • the windings 101 include a cathode winding 101a, an anode winding 101b and a diaphragm winding 101c.
  • Each winding 101 winds around the virtual axis Y once, and each winding 101 forms two layers of sub-windings in the thickness H direction of the main body 10, and each layer of sub-windings winds around the virtual axis Y half a circle.
  • the two layers of sub-windings of each winding 101 are axially symmetrically arranged in the thickness direction of the main body 10, that is, vertically
  • the sub-winding parts are arranged symmetrically along an axis X which is perpendicular to the thickness H direction of the main body 10 and perpendicular to the virtual axis Y.
  • Each layer of sub-winding parts includes a cathode sub-winding part, a diaphragm sub-winding part and an anode sub-winding part which are stacked.
  • the pole ear portion 20 is connected to one side of the main body portion 10 , and includes a plurality of cathode pole ears 21 and a plurality of anode pole ears 22 .
  • each cathode winding part 101a in a part of the cathode winding parts 101a is connected to a cathode pole ear 21, and one side of each cathode winding part 101a in another part of the cathode winding parts 101a is connected to two cathode pole ears 21.
  • the two cathode pole ears 21 of each cathode winding part 101a in another part of the cathode winding parts 101a are located on opposite sides of the virtual axis Y along the thickness H direction of the main body 10.
  • each cathode winding part 101a in a part of the cathode winding parts 101a is connected to a cathode pole ear 21
  • one side of each layer of cathode sub-winding part of each cathode winding part 101a in another part of the cathode winding parts 101a is connected to a cathode pole ear 21.
  • each anode winding part 101b in a part of the anode winding parts 101b is connected to one anode tab 22, and one side of each anode winding part 101b in another part of the anode winding parts 101b is connected to two anode tabs 22.
  • the two anode tabs 22 of each anode winding part 101b in another part of the anode winding parts 101b are located on opposite sides of the virtual axis Y along the thickness direction of the main body 10.
  • each anode winding part 101b in a part of the anode winding parts 101b is connected to one anode tab 22
  • one side of each layer of anode sub-winding part of each anode winding part 101b in another part of the anode winding parts 101b is connected to one anode tab 22.
  • the wound battery cell 100 represents a flat wound body formed by manually or machine-winding the cathode electrode sheet 11, the anode electrode sheet 12 and the separator 13 around the virtual axis Y. Specifically, in the process of forming the battery cell, the electrode sheet and the separator 13 use the winding needle as the supporting component of the battery cell to provide winding support for the battery cell, and the battery cell is wound on the outside of the winding needle. After completing the battery cell winding step, the winding needle can be taken out of the battery cell.
  • the main body 10 represents a flat winding body formed by winding a cathode pole piece 11, an anode pole piece 12 and a separator 13.
  • the cathode pole piece 11 includes a cathode current collector 11a and a cathode active material layer 11b, and the cathode active material layer 11b is coated on the surface of the cathode current collector 11a.
  • the material of the cathode current collector 11a can be aluminum
  • the cathode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide.
  • the anode pole piece 12 includes an anode current collector 12a and an anode active material layer 12b, and the anode active material layer 12b is coated on the surface of the anode current collector 12a.
  • the material of the anode current collector 12a can be copper, and the anode active material can be carbon or silicon.
  • the material of the separator 13 can be PP or PE.
  • the virtual axis Y represents the line connecting the centroids of all cross sections of the main body 10.
  • the winding part 101 represents a portion of the cathode electrode sheet 11, a portion of the anode electrode sheet 12 or a portion of the separator 13 wound in each turn of the main body 10 formed by winding multiple turns.
  • the cathode winding part 101a represents a portion of the cathode electrode sheet 11 wound in each turn of the main body 10 formed by winding multiple turns.
  • the anode winding part 101b represents a portion of the anode electrode sheet 12 wound in each turn of the main body 10 formed by winding multiple turns.
  • the separator winding part 101c represents a portion of the separator 13 wound in each turn of the main body 10 formed by winding multiple turns.
  • the tab 20 is connected to the main body 10 and is a conductor used to lead out the cathode tab 11 and the anode tab 12 of the main body 10.
  • the cathode tab 21 is a tab used to lead out the cathode tab 11 and can be integrally formed with the cathode current collector 11a.
  • the anode tab 22 is a tab used to lead out the anode tab 12 and can be integrally formed with the anode current collector 11a.
  • the cathode current collector 11a not coated with the cathode active material protrudes from the cathode current collector 11a coated with the cathode active material, and the portion of the cathode current collector 11a not coated with the cathode active material serves as the cathode tab 21.
  • the anode current collector 12a not coated with the anode active material protrudes from the anode current collector 12a coated with the anode active material, and the portion of the anode current collector 12a not coated with the anode active material serves as the anode tab 22.
  • One cathode tab 21 is connected to one side of the cathode winding 101a, which means that one cathode tab 21 is provided on one side of the cathode winding 101a along the virtual axis Y.
  • Two cathode tabs 21 are connected to one side of the cathode winding 101a, which means that two cathode tabs 21 are provided on one side of the cathode winding 101a along the virtual axis Y.
  • One anode tab 22 is connected to one side of the anode winding 101b, which means that one anode tab 22 is provided on one side of the anode winding 101b along the virtual axis Y.
  • Two anode tabs 22 are connected to one side of the anode winding 101b, which means that two anode tabs 22 are provided on one side of the anode winding 101b along the virtual axis Y.
  • One cathode tab 21 is connected or provided, which means that only one cathode tab 21 is connected or provided; two cathode tabs 21 are connected or provided, which means that only two cathode tabs 21 are connected or provided; one anode tab 22 is connected or provided, which means that only one anode tab 22 is connected or provided; and two anode tabs 22 are connected or provided, which means that only two anode tabs 22 are connected or provided.
  • the present application connects one cathode tab 21 on one side of each cathode winding portion 101a in a portion of the cathode winding portions 101a, and connects two cathode tabs 21 on one side of each cathode winding portion 101a in another portion of the cathode winding portions 101a.
  • the number of cathode tabs 21 is increased, thereby improving the flow area of the wound battery cell 100.
  • interlayer cold solder joints between too many cathode tabs 21 and the conductive connection welding joints are avoided.
  • the present application connects one anode tab 22 to one side of each anode winding portion 101b in a portion of the anode winding portion 101b, and connects two anode tabs 22 to one side of each anode winding portion 101b in another portion of the anode winding portion 101b.
  • the number of anode tabs 22 is increased, thereby improving the flow area of the wound battery cell 100.
  • interlayer cold solder joints caused by too many anode tabs 22 and the conductive connection welding joints are avoided.
  • each anode winding part 101b in a part of the anode winding part 101b is connected to an anode pole tab 22
  • one side of each anode winding part 101b in another part of the anode winding part 101b is connected to two anode pole tabs 22
  • the two anode pole tabs 22 of each anode winding part 101b in another part of the anode winding part 101b are arranged symmetrically along the thickness direction of the main body 10
  • each cathode winding part 101a is connected to a cathode pole tab 21.
  • the multiple anode pole tabs 22 in the first frame S1 in FIG2 and the multiple anode pole tabs 22 in the second frame S2 are arranged symmetrically along the axis X perpendicular to the thickness direction of the main body 10 and perpendicular to the virtual axis Y direction.
  • the number of multiple anode tabs 22 is increased compared to the number when only one anode tab 22 is provided for each circle of the anode winding portion 101b, which increases the flow area of the wound battery cell 100, reduces the internal resistance of the wound battery cell 100, and the number of multiple anode tabs 22 will not cause the problem of interlayer cold welding between too many anode tabs 22 and the conductive connection welding joints. For example, avoiding the problem of interlayer cold welding between the conductive connection welding joints caused by two anode tabs 22 provided for each circle of the anode winding portion 101b.
  • the number of circles of the anode winding portion 101b with two anode tabs 22 can be selected and designed specifically according to the total number of circles of the anode winding portion 101b.
  • the cathode electrode sheet 11 includes a cathode current collector 11 a and a cathode active material layer 11 b disposed on one side of the cathode current collector 11 a ;
  • the anode electrode sheet 12 includes an anode current collector 12 a and an anode active material layer 12 b disposed on one side of the anode current collector 12 a .
  • cathode tab 21 is connected to the cathode current collector 11a of the corresponding cathode winding part 101a, and the other end is away from the cathode current collector 11a along the virtual axis Y.
  • One end of the anode tab 22 is connected to the anode current collector 12a of the corresponding anode winding part 101b, and the other end is away from the anode current collector 12a along the virtual axis Y.
  • multiple cathode tabs 21 located on the same side of the virtual axis Y are stacked, and multiple anode tabs 22 located on the same side of the virtual axis Y are stacked.
  • the thickness of the cathode tab 21 is the same as the thickness of the cathode current collector 11 a ; the thickness of the anode tab 22 is the same as the thickness of the anode current collector 12 a .
  • the innermost circle of the flat winding body is a part of the anode winding part 101b
  • the outermost circle of the flat winding body is a part of the anode winding part 101b, which is used to slow down the occurrence of lithium deposition. That is, the anode winding part 101b is at least one more circle than the cathode winding part 101a.
  • the multiple cathode pole ears 21 stacked are equal-length pole ears or gradually variable-length pole ears.
  • the multiple anode pole ears 22 stacked are equal-length pole ears or gradually variable-length pole ears.
  • the multiple cathode pole ears 21/anode pole ears 22 stacked can overlap or partially overlap (i.e., staggered) or be arranged at intervals in their respective width directions. It can be understood that the multiple cathode pole ears 21/anode pole ears 22 stacked in the direction of the thickness H of the main body 10 partially overlap or are arranged at intervals.
  • the width of the multiple cathode pole ears 21/anode pole ears 22 increases, and the area of the copper adapter and the aluminum adapter will also increase accordingly.
  • the width direction of the battery cell is designed to be too narrow, there is interference between the positive and negative poles or between the injection hole and the cathode adapter.
  • the former has a short circuit risk, and the latter will affect the battery injection. Therefore, in this embodiment, the multiple cathode pole ears 21/anode pole ears 22 stacked are arranged to overlap in their respective width directions.
  • the plurality of cathode tabs 21 stacked are tabs of equal length, and the length L of the cathode tab 21 is 28% to 29% of the width W of the cathode winding portion 101a connected to the cathode tab 21.
  • the plurality of anode tabs 22 stacked are tabs of equal length, and the length L of the anode tab 22 is 28% to 29% of the width W of the anode winding portion 101b connected to the anode tab 22.
  • the width K1 of the end of the cathode tab 21 away from the cathode current collector 11a is 10% to 12.5% of the circumference of the innermost winding portion 101 of the flat winding body
  • the width K2 of the end of the cathode tab 21 connected to the cathode current collector 11a is 11% to 14% of the circumference of the innermost winding portion 101 of the flat winding body.
  • the flat winding body has a length direction and a width direction; the length direction is the length direction of the flat winding body before or after it is wound along the winding direction; the virtual axis Y is parallel to the width direction; the width of the anode electrode sheet 12 is greater than the width of the cathode electrode sheet 11, and the length of the anode electrode sheet 12 is greater than the length of the cathode electrode sheet 11.
  • one side of each cathode winding 101a in the cathode winding 101a is connected to the cathode tab 21, specifically one or two cathode tabs 21.
  • One side of the winding portion 101b is connected to the anode tab 22, specifically one or two anode tabs 22.
  • each cathode winding portion 101a in the cathode winding portion 101a is connected to the cathode tab 21, specifically one or two cathode tabs 21; in the anode winding portion 101b, the innermost anode winding portion 101b or the outermost anode winding portion 101b is not provided with the anode tab 22, and one side of the other anode winding portions 101b is connected to the anode tab 22, specifically one or two anode tabs 22.
  • each cathode winding portion 101a in the first half of the cathode winding portions 101a is connected to two cathode pole ears 21, and one side of each cathode winding portion 101a in the second half of the cathode winding portions 101a is connected to one cathode pole ear 21 (as shown in Figures 6 and 7).
  • each anode winding portion 101b in the first half of the anode winding portions 101b is connected to two anode tabs 22, and one side of each anode winding portion 101b in the second half of the anode winding portions 101b is connected to one anode tab 22 (as shown in Figures 2 and 7).
  • the flow area of the wound battery cell 100 is increased, the internal resistance of the wound battery cell 100 is reduced, and the number of multiple cathode tabs 21 will not result in the problem of interlayer cold solder joints between too many cathode tabs 21 and conductive connection welding joints.
  • the multiple cathode tabs 21 are arranged in such a way that the cathode tabs 21 are closely spaced, and the welding effect is good.
  • the flow area of the wound battery cell 100 is increased, the internal resistance of the wound battery cell 100 is reduced, and the number of multiple anode tabs 22 will not result in the problem of interlayer cold solder joints caused by too many anode tabs 22 and conductive connection welding joints.
  • the multiple anode tabs 22 are arranged in a manner that the anode tabs 22 are closely spaced, and the welding effect is good.
  • Figure 5a is a second partial cross-sectional view of the wound battery cell provided in Figure 2 along the A-A line
  • Figure 5b is a second partial cross-sectional view of the wound battery cell provided in Figure 2 along the B-B line.
  • the difference between the wound battery cell 100 provided in this embodiment and the wound battery cell 100 provided in FIG4a is that: as shown in 5a, in the direction of the virtual axis Y, the multiple cathode pole ears 21 of this embodiment are gradually variable length pole ears, and the maximum length of the cathode pole ear 21 is 28% to 29% of the width W of the cathode winding portion 101a connected to the cathode pole ear 21, and the minimum length of the cathode pole ear 21 is 19% to 20% of the width W of the cathode winding portion 101a connected to the cathode pole ear 21; the length L of the multiple cathode pole ears 21 stacked in a layer decreases layer by layer in an equidistant size from the inner circle to the outer circle.
  • the multiple anode tabs 22 stacked are tabs with gradient lengths.
  • the maximum length of the anode tab 22 is 28% to 29% of the width W of the anode winding portion 101b connected to the anode tab 22, and the minimum length of the anode tab 22 is 19% to 20% of the width W of the anode winding portion 101b connected to the anode tab 22;
  • the length L of the multiple anode tabs 22 stacked decreases layer by layer in an equidistant size from the inner circle to the outer circle.
  • FIG. 6 is a top view schematically showing a second embodiment of a wound battery cell provided in the present application.
  • the wound battery cell 100 provided in this embodiment is different from the wound battery cell 100 provided in FIG. 2 in that: in this embodiment, one side of each cathode winding portion 101a in a portion of the cathode winding portions 101a is connected to a cathode tab 21, and one side of each cathode winding portion 101a in another portion of the cathode winding portions 101a is connected to a cathode tab 21.
  • Two cathode tabs 21 are connected to the side of the main body 10 , and the two cathode tabs 21 of each cathode winding part 101a in the other part of the cathode winding part 101a are symmetrically arranged along the thickness direction H of the main body 10 ; and each anode winding part 101b is connected to an anode tab 22 .
  • the number of the plurality of cathode tabs 21 is increased compared to the number when only one cathode tab 21 is provided in each circle of the cathode winding portion 101a, thereby increasing the flow area of the wound battery cell 100 and reducing the internal resistance of the wound battery cell 100. Furthermore, the number of the plurality of cathode tabs 21 will not result in the problem of interlayer cold solder joints caused by too many cathode tabs 21 and the conductive connection welding joints.
  • FIG. 7 is a top view schematically showing a third embodiment of a wound battery cell provided in the present application.
  • the difference between the wound cell 100 shown in this embodiment and the wound cell 100 shown in FIG. 2 is that: in the wound cell 100 provided in this embodiment, one side of each cathode winding part 101a in a part of the cathode winding parts 101a is connected to a cathode pole tab 21, and one side of each cathode winding part 101a in another part of the cathode winding parts 101a is connected to two cathode pole tabs 21.
  • each anode winding part 101b in a part of the anode winding parts 101b is connected to an anode pole tab 22
  • one side of each anode winding part 101b in another part of the anode winding parts 101b is connected to two anode pole tabs 22.
  • the number of multiple cathode pole tabs 21 and the number of multiple anode pole tabs 22 are increased, which jointly improve the overall flow area of the wound battery cell 100, avoid interlayer cold solder joints caused by too many cathode pole tabs 21, anode pole tabs 22 and conductive connection welding joints, and the increase trend of the number of multiple cathode pole tabs 21 and the number of multiple anode pole tabs 22 is the same, which has a synergistic effect on improving the overall flow capacity of the wound battery cell 100.
  • each cathode winding part 101a in the odd-numbered turns of the cathode winding part 101a is connected to two cathode pole tabs 21, and one side of each cathode winding part 101a in the even-numbered turns of the cathode winding part 101a is connected to one cathode pole tab 21.
  • one side of each cathode winding part 101a in the odd-numbered turns of the cathode winding part 101a is connected to one cathode pole tab 21, and one side of each cathode winding part 101a in the even-numbered turns of the cathode winding part 101a is connected to two cathode pole tabs 21.
  • one side of each anode winding portion 101b in the odd-numbered turns of the anode winding portion 101b is connected to two anode tabs 22, and one side of each anode winding portion 101b in the even-numbered turns of the anode winding portion 101b is connected to one anode tab 22; or, one side of each anode winding portion 101b in the odd-numbered turns of the anode winding portion 101b is connected to one anode tab 22, and one side of each anode winding portion 101b in the even-numbered turns of the anode winding portion 101b is connected to two anode tabs 22.
  • FIG. 8 is a top view schematically showing a fourth embodiment of a wound battery cell provided in the present application.
  • the difference between the wound cell 100 shown in this embodiment and the wound cell 100 shown in FIG2 is that: in this embodiment, along the direction from the inner circle to the outer circle, one side of each cathode winding part 101a in the odd-numbered circles of the cathode winding part 101a is connected to two cathode pole tabs 21, one side of each cathode winding part 101a in the even-numbered circles of the cathode winding part 101a is connected to one cathode pole tab 21, and one side of each circle of the anode winding part 101b is connected to one anode pole tab 22.
  • This arrangement on the one hand, achieves the effect of increasing the flow area of the wound cell 100, and on the other hand, makes the distribution of multiple cathode pole tabs 21 balanced, thereby improving the welding effect of multiple cathode pole tabs 21.
  • FIG. 9 is a top view schematically showing a fifth embodiment of a wound battery cell provided in the present application.
  • the difference between the wound cell 100 shown in this embodiment and the wound cell 100 shown in FIG2 is that: in this embodiment, along the direction from the inner circle to the outer circle, one side of each anode winding part 101b in the odd-numbered circles of the anode winding part 101b is connected to two anode pole tabs 22, one side of each anode winding part 101b in the even-numbered circles of the anode winding part 101b is connected to one anode pole tab 22, and one side of each circle of the cathode winding part 101a is connected to one cathode pole tab 21.
  • This arrangement on the one hand, achieves the effect of increasing the flow area of the wound cell 100, and on the other hand, makes the distribution of multiple anode pole tabs 22 balanced, and improves the welding effect of multiple anode pole tabs 22.
  • FIG. 10 is a top view schematically showing a sixth embodiment of a wound battery cell provided in the present application.
  • the difference between the wound cell 100 shown in this embodiment and the wound cell 100 shown in FIG. 2 is that: in this embodiment, along the direction from the inner circle to the outer circle, one side of each anode winding part 101b in the odd-numbered turns of the anode winding part 101b is connected to two anode tabs 22, and one side of each anode winding part 101b in the even-numbered turns of the anode winding part 101b is connected to one anode tab 22.
  • each cathode winding part 101a in the odd-numbered turns of the cathode winding part 101a is connected to two cathode tabs 21
  • one side of each cathode winding part 101a in the even-numbered turns of the cathode winding part 101a is connected to one cathode tab 21
  • one side of each turn of the anode winding part 101b is connected to one anode tab 22.
  • This arrangement achieves the effect of increasing the flow area of the wound battery cell 100 , and on the other hand, makes the distribution of the multiple cathode tabs 21 and the anode tabs 22 balanced, thereby improving the welding effect of the multiple cathode tabs 21 and the anode tabs 22 .
  • FIG. 11 is a schematic diagram of the structure of the battery provided in the present application.
  • the present application provides a battery 200 , including a housing 210 and any of the above-mentioned wound battery cells 100 .
  • the battery 200 represents a single physical module including one or more wound cells 100 (as shown in Figures 1 to 10) to provide higher voltage and capacity.
  • the wound cell 100 includes a main body 10 and a pole ear portion 20.
  • the main body 10 includes a cathode pole sheet 11, an anode pole sheet 12 and a separator 13.
  • the separator 13 is stacked between the cathode pole sheet 11 and the anode pole sheet 12.
  • the main body 10 is wound around the virtual axis Y to form a flat winding body.
  • the main body 10 includes a plurality of windings 101 along the winding direction.
  • the winding portion 101 includes a cathode winding portion 101a, an anode winding portion 101b and a separator winding portion 101c.
  • the pole ear portion 20 is connected to one side of the main body 10, and includes a plurality of cathode pole ears 21 and a plurality of anode pole ears 22.
  • each cathode winding part 101a in a part of the cathode winding parts 101a is connected to one cathode pole ear 21, and one side of each cathode winding part 101a in another part of the cathode winding parts 101a is connected to two cathode pole ears 21.
  • the two cathode pole ears 21 of each cathode winding part 101a in another part of the cathode winding parts 101a are located on opposite sides of the virtual axis Y along the thickness H direction of the main body 10.
  • each anode winding part 101b in a part of the anode winding parts 101b is connected to one anode tab 22, and one side of each anode winding part 101b in another part of the anode winding parts 101b is connected to two anode tabs 22.
  • the two anode tabs 22 of each anode winding part 101b in another part of the anode winding parts 101b are located on opposite sides of the virtual axis Y along the thickness direction of the main body 10.
  • FIG. 12 is a schematic diagram of the structure of the battery assembly provided in the present application.
  • the present application provides a battery assembly 300, including the battery 200 described above.
  • Battery assembly 300 It may also include a box for providing a storage space for the battery 200, and the box may be in various shapes.
  • multiple batteries 200 may be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that multiple batteries 200 are both connected in series and in parallel.
  • Multiple batteries 200 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by multiple batteries 200 is accommodated in the box; of course, the battery assembly 300 may also be a battery module formed by multiple batteries 200 connected in series, in parallel, or in mixed connection, and then multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box.
  • the battery assembly 300 may also include other structures.
  • the battery assembly 300 may also include a confluence component for realizing electrical connection between multiple batteries 200.
  • Each battery 200 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.
  • FIG. 13 is a schematic diagram of the structure of the electrical device provided in the present application.
  • the present application provides an electrical device including the battery assembly 300 described above.
  • the power-consuming device may be a mobile phone, a computer, an electric motorcycle, an electric car, etc.
  • This embodiment is described by taking an electric car 400 as an example.
  • a battery assembly 300 is arranged inside the electric car 400, and the battery assembly 300 may be arranged at the bottom, head, or tail of the electric car 400.
  • the battery assembly 300 may be used to power the electric car 400, for example, the battery assembly 300 may be used as an operating power source for the electric car 400.
  • the electric car 400 may also include a controller 401 and a motor 402, and the controller 401 is used to control the battery assembly 300 to power the motor 402, for example, for starting, navigating, and driving the electric car 400.
  • the battery assembly 300 can not only serve as an operating power source for the electric vehicle 400 , but also serve as a driving power source for the electric vehicle 400 , thereby providing driving power for the electric vehicle 400 .
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

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Abstract

一种卷绕式电芯、电池、电池组件及用电装置，卷绕式电芯（100）包括主体部（10）和极耳部（20）；一部分阴极卷绕部（101a）中的每个阴极卷绕部（101a）的一侧连接一个阴极极耳（21），另一部分阴极卷绕部（101a）中的每个阴极卷绕部（101a）的一侧连接两个阴极极耳（21）；和/或，一部分阳极卷绕部（101b）中的每个阳极卷绕部（101b）的一侧连接一个阳极极耳（22），另一部分阳极卷绕部（101b）中的每个阳极卷绕部（101b）的一侧连接两个阳极极耳（22）。该结构一方面增加了阴极极耳/阳极极耳的数量，提高了卷绕式电芯的过流面积，另一方面对阴极极耳/阳极极耳数量的约束，避免了过多的阴极极耳/阳极极耳与导电连接焊接接头出现层间虚焊。

Description

卷绕式电芯、电池、电池组件及用电装置
相关申请的交叉引用
本申请要求2022年10月26日提交的中国专利申请202222831093.5的优先权，其全部内容通过引用并入本文。
技术领域
本申请涉及电池技术技术领域，特别是涉及卷绕式电芯、电池、电池组件及用电装置。
背景技术
本部分提供的仅仅是与本申请相关的背景信息，其并不必然是现有技术。
当前市场上的二次电池以超长寿命、使用安全、大容量等优势受到广泛关注。二次电池的电芯是影响二次电池电化学性能的主要部件。以卷绕式电芯为例，其由阴极极片、阳极极片和隔膜卷绕形成，在阴极极片和阳极极片上分别至少设置一个极耳。为了提高过流面积、降低电池内阻，部分卷绕式电芯采用在阴极极片和阳极极片上分别设置多个极耳。随着二次电池容量增加的趋势，卷绕式电芯的极片层数逐渐增加，阴极极片的多个极耳和阳极极片的多个极耳的层数也随之增加，从而容易出现阴极极片的多个极耳和阳极极片的多个极耳的层数过多的问题，这一问题则容易使现有超声波震动能量无法穿透多层极耳，从而导致电芯的极耳与导电连接焊接接头出现层间虚焊的问题。
发明内容
本申请主要解决的技术问题是卷绕式电芯极耳的层数过多，导致电芯的极耳与导电连接焊接接头出现层间虚焊的问题。
为解决上述技术问题，本申请采用的一个技术方案是：一种卷绕式电芯，包括：
主体部，包括阴极极片、阳极极片和隔膜；隔膜层叠设于阴极极片和阳极极片之间；主体部绕虚拟轴线卷绕形成扁平状卷绕体；主体部沿卷绕方向包括有多圈卷绕部；卷绕部包括阴极卷绕部、阳极卷绕部和隔膜卷绕部；
极耳部，连接于主体部的一侧，包括多个阴极极耳和多个阳极极耳；
其中，一部分阴极卷绕部中的每个阴极卷绕部的一侧连接一个阴极极耳，另一部分阴极卷绕部中的每个阴极卷绕部的一侧连接两个阴极极耳；另一部分阴极卷绕部中的每个阴极卷绕部的两个阴极极耳沿主体部的厚度方向位于虚拟轴线的相对两侧；和/或，
一部分阳极卷绕部中的每个阳极卷绕部的一侧连接一个阳极极耳，另一部分阳 极卷绕部中的每个阳极卷绕部的一侧连接两个阳极极耳；另一部分阳极卷绕部中的每个阳极卷绕部的两个阳极极耳沿主体部的厚度方向位于虚拟轴线的相对两侧。
在一些实施例中，一部分阴极卷绕部中的每个阴极卷绕部的一侧连接一个阴极极耳，另一部分阴极卷绕部中的每个阴极卷绕部的一侧连接两个阴极极耳；且，一部分阳极卷绕部中的每个阳极卷绕部的一侧连接一个阳极极耳，另一部分阳极卷绕部中的每个阳极卷绕部的一侧连接两个阳极极耳。
在一些实施例中，一部分阴极卷绕部中的每个阴极卷绕部的一侧连接一个阴极极耳，另一部分阴极卷绕部中的每个阴极卷绕部的一侧连接两个阴极极耳，另一部分阴极卷绕部中的每个阴极卷绕部的两个阴极极耳沿主体部的厚度方向轴对称设置；且，每个阳极卷绕部连接有一个阳极极耳。
在一些实施例中，一部分阳极卷绕部中的每个阳极卷绕部的一侧连接一个阳极极耳，另一部分阳极卷绕部中的每个阳极卷绕部的一侧连接两个阳极极耳，另一部分阳极卷绕部中的每个阳极卷绕部的两个阳极极耳沿主体部的厚度方向轴对称设置；且，每个阴极卷绕部连接有一个阴极极耳。
在一些实施例中，沿由内圈向外圈方向，前半数的阴极卷绕部中的每个阴极卷绕部的一侧连接两个阴极极耳，后半数的阴极卷绕部中的每个阴极卷绕部的一侧连接一个阴极极耳；和/或，
沿由内圈向外圈方向，前半数的阳极卷绕部中的每个阳极卷绕部的一侧连接两个阳极极耳，后半数的阳极卷绕部中的每个阳极卷绕部的一侧连接一个阳极极耳。
可选地，沿由内圈向外圈方向，第奇数圈的阴极卷绕部中的每个阴极卷绕部的一侧连接两个阴极极耳，第偶数圈的阴极卷绕部中的每个阴极卷绕部的一侧连接一个阴极极耳；或，第奇数圈的阴极卷绕部中的每个阴极卷绕部的一侧连接一个阴极极耳，第偶数圈的阴极卷绕部中的每个阴极卷绕部的一侧连接两个阴极极耳；和/或，
沿由内圈向外圈方向，第奇数圈的阳极卷绕部中的每个阳极卷绕部的一侧连接两个阳极极耳，第偶数圈的阳极卷绕部中的每个阳极卷绕部的一侧连接一个阳极极耳；或，第奇数圈的阳极卷绕部中的每个阳极卷绕部的一侧连接一个阳极极耳，第偶数圈的阳极卷绕部中的每个阳极卷绕部的一侧连接两个阳极极耳。
在一些实施例中，阴极极片包括阴极集流体和设置在阴极集流体一侧的阴极活性物质层；阳极极片包括阳极集流体和设置在阳极集流体一侧的阳极活性物质层；
阴极极耳的一端与对应的阴极卷绕部的阴极集流体连接，另一端沿着虚拟轴线远离阴极集流体；阳极极耳的一端与对应的阳极卷绕部的阳极集流体连接，另一端沿着虚拟轴线远离阳极集流体；沿主体部的厚度方向，位于虚拟轴线同一侧的多个阴极极耳层叠设置，位于虚拟轴线同一侧的多个阳极极耳层叠设置。
在一些实施例中，阴极极耳的厚度与阴极集流体的厚度相同；阳极极耳的厚度与阳极集流体的厚度相同。
在一些实施例中，在虚拟轴线方向，层叠设置的多个阴极极耳为等长极耳或渐 变长度极耳；在虚拟轴线方向，层叠设置的多个阳极极耳为等长极耳或渐变长度极耳。
在一些实施例中，层叠设置的多个阴极极耳为等长极耳，阴极极耳的长度为与阴极极耳连接的阴极卷绕部的宽度的28％～29％；层叠设置的多个阳极极耳为等长极耳，阳极极耳的长度为与阳极极耳连接的阳极卷绕部的宽度的28％～29％。
在一些实施例中，层叠设置的多个阴极极耳为渐变长度极耳，多个阴极极耳中，阴极极耳的最大长度为与阴极极耳连接的阴极卷绕部的宽度的28％～29％，阴极极耳的最小长度为与阴极极耳连接的阴极卷绕部的宽度的19％～20％；层叠设置的多个阴极极耳的长度沿由内圈向外圈方向按等差尺寸逐层递减；
层叠设置的多个阳极极耳为渐变长度极耳，多个阳极极耳中，阳极极耳的最大长度为与阳极极耳连接的阳极卷绕部的宽度的28％～29％，阳极极耳的最小长度为与阳极极耳连接的阳极卷绕部的宽度的19％～20％；层叠设置的多个阳极极耳的长度沿由内圈向外圈方向按等差尺寸逐层递减。
在一些实施例中，阴极极耳远离阴极集流体的一端的宽度为扁平状卷绕体的最内圈卷绕部的周长的10％～12.5％，阴极极耳连接阴极卷绕部的一端的宽度为扁平状卷绕体的最内圈卷绕部的周长的11％～14％。
在一些实施例中，扁平状卷绕体具有长度方向和宽度方向；虚拟轴线平行于宽度方向；阳极极片的宽度大于阴极极片的宽度，阳极极片的长度大于阴极极片的长度。
在一些实施例中，扁平状卷绕体的最内圈为部分阳极卷绕部；扁平状卷绕体的最外圈为部分阳极卷绕部。
在一些实施例中，阴极卷绕部中的每个阴极卷绕部的一侧均连接一个或两个阴极极耳；阳极卷绕部中的每个阳极卷绕部的一侧均连接一个或两个阳极极耳；或，
阴极卷绕部中的每个阴极卷绕部的一侧均连接一个或两个阴极极耳；阳极卷绕部中，最内圈的阳极卷绕部或最外圈的阳极卷绕部不设置阳极极耳，其它阳极卷绕部的一侧均连接一个或两个阳极极耳。
为解决上述技术问题，本申请采用的另一个技术方案是：一种电池，包括上述任一的卷绕式电芯。
为解决上述技术问题，本申请采用的另一个技术方案是：一种电池组件，包括上述电池。
为解决上述技术问题，本申请采用的另一个技术方案是：一种用电装置，包括上述电池组件。
有益效果：本申请通过在一部分阴极卷绕部/阳极卷绕部中的每个阴极卷绕部/阳极卷绕部的一侧连接一个阴极极耳/阳极极耳，另一部分阴极卷绕部/阳极卷绕部中的每个阴极卷绕部/阳极卷绕部的一侧连接两个阴极极耳/阳极极耳，一方面增加了阴极极耳/阳极极耳的数量，提高了卷绕式电芯的过流面积，另一方面由于对阴极极耳/阳极极耳数量的约束，避免了过多的阴极极耳/阳极极耳与导电连接焊接接头出现层 间虚焊。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1是本申请提供的卷绕式电芯的结构示意图；
图2是图1提供的卷绕式电芯的俯视示意图；
图3是图1提供的卷绕式电芯的极片和隔膜的结构示意图；
图4a是图2提供的卷绕式电芯沿A-A线的局部剖视图；
图4b是图2提供的卷绕式电芯沿B-B线的局部剖视图；
图5a是图2提供的卷绕式电芯沿A-A线的第二种局部剖视图；
图5b是图2提供的卷绕式电芯沿B-B线的第二种局部剖视图；
图6是本申请提供的卷绕式电芯的第二实施例的俯视示意图；
图7是本申请提供的卷绕式电芯的第三实施例的俯视示意图；
图8是本申请提供的卷绕式电芯的第四实施例的俯视示意图；
图9是本申请提供的卷绕式电芯的第五实施例的俯视示意图；
图10是本申请提供的卷绕式电芯的第六实施例的俯视示意图；
图11是本申请提供的电池的结构示意图；
图12是本申请提供的电池组件的结构示意图；
图13是本申请提供的用电装置的结构示意图。
附图标号：
100-卷绕式电芯、10-主体部、11-阴极极片、12-阳极极片、13-隔膜、Y-虚拟轴线、H-主体部的厚度、X-垂直于主体部厚度方向且垂直于虚拟轴线方向的轴线、101-卷绕部、101a-阴极卷绕部、101b-阳极卷绕部、101c-隔膜卷绕部、20-极耳部、21-阴极极耳、22-阳极极耳、11a-阴极集流体、11b-阴极活性物质层、12a-阳极集流体、12b-阳极活性物质层、L-阴极/阳极极耳的长度、W-阴极/阳极卷绕部的宽度、K1-阴极/阳极极耳远离阴极/阳极集流体的一端的宽度、K2-阴极/阳极极耳连接阴极/阳极集流体的一端的宽度、S1-第一框、S2-第二框、200-电池、210-外壳、300-电池组件、400-电动汽车、401-控制器、402-马达。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请中的术语“第一”、“第二”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”、“第三”的特征可以明示或者隐含地包括至少一个该特征。本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。本申请实施例中所有方向性指示(诸如上、下、左、右、前、后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
本申请研发人员在研究中发现：电芯的过流面积为多层极耳的厚度之和与极耳宽度的乘积。有些极限能量密度的电芯设计，基材厚度要尽可能减薄，为满足过流面积的要求，只能增加极耳层数或加宽极耳下宽，当极耳层数不变，极耳宽度加宽，在极耳错位符合规范的情况下，向左错位可能会干涉防爆阀底下的下塑胶，出现极耳搭接下塑胶的不良风险(电芯高温循环条件下，下塑胶会软化变形，与下塑胶搭接的极耳有可能直接与电池防爆阀接触，造成短路，电池起火风险大幅度提升)，抑或是向右错位，可能会干涉注液孔，造成注液孔堵塞风险。因此，增加极耳层数是为满足过流面积要求的可选方式。但极耳层数不能无限制增加，需要在增加极耳层数的情况下，避免电芯的极耳与导电连接焊接接头出现层间虚焊的问题的发生。
下面结合附图和实施例对本申请进行详细的说明。
请参阅图1-图4b，图1是本申请提供的卷绕式电芯的结构示意图，图2是图1提供的卷绕式电芯的俯视示意图，图3是图1提供的卷绕式电芯的极片和隔膜的结构示意图，图4a是图2提供的卷绕式电芯沿A-A线的局部剖视图，图4b是图2提供的卷绕式电芯沿B-B线的局部剖视图。
参见图1-图4b，本申请实施例提供一种卷绕式电芯100，包括主体部10和极耳部20。
其中，主体部10包括阴极极片11、阳极极片12和隔膜13。隔膜13层叠设于阴极极片11和阳极极片12之间。主体部10绕虚拟轴线Y卷绕形成扁平状卷绕体。主体部10沿卷绕方向包括有多圈卷绕部101。卷绕部101包括阴极卷绕部101a、阳极卷绕部101b和隔膜卷绕部101c。每个卷绕部101绕虚拟轴线Y一周，每个卷绕部101在主体部10的厚度H方向形成两层子卷绕部，每层子卷绕部绕虚拟轴线Y半周。每个卷绕部101的两层子卷绕部在主体部10的厚度方向轴对称设置，即，垂 直于主体部10厚度H方向且垂直于虚拟轴线Y方向的轴线X轴对称设置。每层子卷绕部包括层叠设置的阴极子卷绕部、隔膜子卷绕部、阳极子卷绕部。
其中，极耳部20连接于主体部10的一侧，包括多个阴极极耳21和多个阳极极耳22。
其中，一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21。另一部分阴极卷绕部101a中的每个阴极卷绕部101a的两个阴极极耳21沿主体部10的厚度H方向位于虚拟轴线Y的相对两侧。即，一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的每层阴极子卷绕部一侧连接一个阴极极耳21。
和/或，一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22。另一部分阳极卷绕部101b中的每个阳极卷绕部101b的两个阳极极耳22沿主体部10的厚度方向位于虚拟轴线Y的相对两侧。即，一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的每层阳极子卷绕部一侧连接一个阳极极耳22。
本申请中：
卷绕式电芯100表示以手工或机器方式，将阴极极片11、阳极极片12和隔膜13绕虚拟轴线Y卷绕形成的扁平状卷绕体，具体地，在电芯形成的工序中，极片和隔膜13以卷针为电芯的支撑部件为电芯卷绕提供卷绕支撑，电芯卷绕在卷针的外侧，完成电芯卷绕步骤后，可以将卷针从电芯内取出。
主体部10表示由阴极极片11、阳极极片12和隔膜13经卷绕形成的扁平状卷绕体。阴极极片11包括阴极集流体11a和阴极活性物质层11b，阴极活性物质层11b涂覆于阴极集流体11a的表面。以锂离子电池为例，阴极集流体11a的材料可以为铝，阴极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。阳极极片12包括阳极集流体12a和阳极活性物质层12b，阳极活性物质层12b涂覆于阳极集流体12a的表面。以锂离子电池为例，阳极集流体12a的材料可以为铜，阳极活性物质可以为碳或硅等。隔膜13的材质可以为PP或PE等。虚拟轴线Y表示主体部10所有横截面形心的连线。
卷绕部101表示多圈卷绕形成的主体部10中，每圈卷绕的部分阴极极片11、部分阳极极片12或部分隔膜13。阴极卷绕部101a表示多圈卷绕形成的主体部10中，每圈卷绕的部分阴极极片11。阳极卷绕部101b表示多圈卷绕形成的主体部10中，每圈卷绕的部分阳极极片12。隔膜卷绕部101c表示多圈卷绕形成的主体部10中，每圈卷绕的部分隔膜13。
极耳部20与主体部10连接，为导电体，用于将主体部10的阴极极片11和阳极极片12引出。阴极极耳21表示用于引出阴极极片11的极耳，可以与阴极集流体11a一体成型。阳极极耳22表示用于引出阳极极片12的极耳，可以与阳极集流体 12a一体成型。在一些具体的实施例中，未涂敷阴极活性物质的阴极集流体11a凸出于已涂覆阴极活性物质的阴极集流体11a，未涂敷阴极活性物质的部分阴极集流体11a作为阴极极耳21。未涂敷阳极活性物质的阳极集流体12a凸出于已涂覆阳极活性物质的阳极集流体12a，未涂敷阳极活性物质的部分阳极集流体12a作为阳极极耳22。
阴极卷绕部101a的一侧连接一个阴极极耳21表示阴极卷绕部101a沿虚拟轴线Y的一侧设置一个阴极极耳21。阴极卷绕部101a的一侧连接两个阴极极耳21表示阴极卷绕部101a沿虚拟轴线Y的一侧设置两个阴极极耳21。阳极卷绕部101b的一侧连接一个阳极极耳22表示阳极卷绕部101b沿虚拟轴线Y的一侧设置一个阳极极耳22。阳极卷绕部101b的一侧连接两个阳极极耳22表示阳极卷绕部101b沿虚拟轴线Y的一侧设置两个阳极极耳22。连接或设置一个阴极极耳21指仅连接或设置一个阴极极耳21，连接或设置两个阴极极耳21指仅连接或设置两个阴极极耳21，连接或设置一个阳极极耳22指仅连接或设置一个阳极极耳22，连接或设置两个阳极极耳22指仅连接或设置两个阳极极耳22。
本申请通过在一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21，一方面增加了阴极极耳21的数量，提高了卷绕式电芯100的过流面积，另一方面由于对阴极极耳21数量的约束，避免了过多的阴极极耳21与导电连接焊接接头出现层间虚焊。
本申请通过在一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22，一方面增加了阳极极耳22的数量，提高了卷绕式电芯100的过流面积，另一方面由于对阳极极耳22数量的约束，避免了过多的阳极极耳22与导电连接焊接接头出现层间虚焊。
具体地，如图2所示，本实施例中，一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的两个阳极极耳22沿主体部10的厚度方向轴对称设置；且，每个阴极卷绕部101a连接有一个阴极极耳21。即，图2中的第一框S1中的多个阳极极耳22与第二框S2中的多个阳极极耳22以垂直于主体部10厚度方向且垂直于虚拟轴线Y方向轴线X轴对称设置。
本实施例中，多个阳极极耳22的数量较每圈阳极卷绕部101b仅设置一个阳极极耳22时的数量增加，增加了卷绕式电芯100的过流面积，降低了卷绕式电芯100的内阻，且多个阳极极耳22的数量不至于出现过多的阳极极耳22与导电连接焊接接头出现层间虚焊的问题。例如，避免每圈阳极卷绕部101b都设置两个阳极极耳22会导致导电连接焊接接头出现层间虚焊的问题。设置两个阳极极耳22的阳极卷绕部101b的圈数具体可以根据阳极卷绕部101b的总圈数进行选择和设计。
请继续结合图1-图3，卷绕式电芯100中，阴极极片11包括阴极集流体11a和设置在阴极集流体11a一侧的阴极活性物质层11b；阳极极片12包括阳极集流体12a和设置在阳极集流体12a一侧的阳极活性物质层12b。
阴极极耳21的一端与对应的阴极卷绕部101a的阴极集流体11a连接，另一端沿着虚拟轴线Y远离阴极集流体11a。阳极极耳22的一端与对应的阳极卷绕部101b的阳极集流体12a连接，另一端沿着虚拟轴线Y远离阳极集流体12a。沿主体部10的厚度方向，位于虚拟轴线Y同一侧的多个阴极极耳21层叠设置，位于虚拟轴线Y同一侧的多个阳极极耳22层叠设置。
在一些具体的实施例中，阴极极耳21的厚度与阴极集流体11a的厚度相同；阳极极耳22的厚度与阳极集流体12a的厚度相同。
在一些实施例中，如图2所示，扁平状卷绕体的最内圈为部分阳极卷绕部101b；扁平状卷绕体的最外圈为部分阳极卷绕部101b，用于减缓析锂情况的发生。也就是说，阳极卷绕部101b比阴极卷绕部101a至少多一圈。
在一些实施例中，在虚拟轴线Y方向，层叠设置的多个阴极极耳21为等长极耳或渐变长度极耳。在虚拟轴线Y方向，层叠设置的多个阳极极耳22为等长极耳或渐变长度极耳。主体部10的厚度H的方向上，层叠设置的多个阴极极耳21/阳极极耳22在各自的宽度方向上可重合或部分重合(即交错)或间隔设置。可以理解，层叠设置的多个阴极极耳21/阳极极耳22在主体部10的厚度H的方向上部分重合或间隔设置的方案，多个阴极极耳21/阳极极耳22的宽度增大，铜转接片及铝转接片面积相应也会增大，在电芯宽度方向设计过窄的情况下，存在正负极干涉或是注液孔与阴极转接片之间的干涉问题，前者有短路风险，后者会影响电池注液。因此，本实施例中，层叠设置的多个阴极极耳21/阳极极耳22在各自的宽度方向上重合设置。
在一些实施例中，如图3和图4a所示，在虚拟轴线Y方向，层叠设置的多个阴极极耳21为等长极耳，阴极极耳21的长度L为与阴极极耳21连接的阴极卷绕部101a的宽度W的28％～29％。如图3和图4b所示，在虚拟轴线Y方向，层叠设置的多个阳极极耳22为等长极耳，阳极极耳22的长度L为与阳极极耳22连接的阳极卷绕部101b的宽度W的28％～29％。
在一些实施例中，如图3所示，阴极极耳21远离阴极集流体11a的一端的宽度K1为扁平状卷绕体的最内圈卷绕部101的周长的10％～12.5％，阴极极耳21连接阴极集流体11a的一端的宽度K2为扁平状卷绕体的最内圈卷绕部101的周长的11％～14％。在一些实施例中，扁平状卷绕体具有长度方向和宽度方向；长度方向即扁平状卷绕体沿卷绕方向卷绕之前或展开之后的长度方向；虚拟轴线Y平行于宽度方向；阳极极片12的宽度大于阴极极片11的宽度，阳极极片12的长度大于阴极极片11的长度。
在一些实施例中，阴极卷绕部101a中的每个阴极卷绕部101a的一侧均连接阴极极耳21，具体为连接一个或两个阴极极耳21。阳极卷绕部101b中的每个阳极卷 绕部101b的一侧均连接阳极极耳22，具体为连接一个或两个阳极极耳22。或，阴极卷绕部101a中的每个阴极卷绕部101a的一侧均连接阴极极耳21，具体为连接一个或两个阴极极耳21；阳极卷绕部101b中，最内圈的阳极卷绕部101b或最外圈的阳极卷绕部101b不设置阳极极耳22，其它阳极卷绕部101b的一侧均连接阳极极耳22，具体为连接一个或两个阳极极耳22。
在一些实施例的卷绕式电芯100中，沿由内圈向外圈方向，前半数的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21，后半数的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21(如图6和图7所示)。
和/或，沿由内圈向外圈方向，前半数的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22，后半数的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22(如图2和图7所示)。
具体地，通过在卷绕式电芯100的内圈阴极卷绕部101a上连接两个阴极极耳21，外圈阴极卷绕部101a上连接一个阴极极耳21，增加了卷绕式电芯100的过流面积，降低了卷绕式电芯100的内阻，且多个阴极极耳21的数量不至于出现过多的阴极极耳21与导电连接焊接接头出现层间虚焊的问题，且多个阴极极耳21的设置方式使阴极极耳21相距紧密，焊接效果良好。通过在卷绕式电芯100的阳极卷绕部101b的一侧连接两个阳极极耳22，外圈阳极卷绕部101b的一侧连接一个阳极极耳22，增加了卷绕式电芯100的过流面积，降低了卷绕式电芯100的内阻，且多个阳极极耳22的数量不至于出现过多的阳极极耳22与导电连接焊接接头出现层间虚焊的问题，且多个阳极极耳22的设置方式使阳极极耳22相距紧密，焊接效果良好。
请参阅图5a-图5b，图5a是图2提供的卷绕式电芯沿A-A线的第二种局部剖视图，图5b是图2提供的卷绕式电芯沿B-B线的第二种局部剖视图。
参见图5a和图5b，本实施例提供的卷绕式电芯100与图4a提供的卷绕式电芯100的区别之处在于：如5a所示，在虚拟轴线Y方向，本实施例的多个阴极极耳21为渐变长度极耳，多个阴极极耳21中，阴极极耳21的最大长度为与阴极极耳21连接的阴极卷绕部101a的宽度W的28％～29％，阴极极耳21的最小长度为与阴极极耳21连接的阴极卷绕部101a的宽度W的19％～20％；层叠设置的多个阴极极耳21的长度L沿由内圈向外圈方向按等差尺寸逐层递减。
如图5b所示，层叠设置的多个阳极极耳22为渐变长度极耳，多个阳极极耳22中，阳极极耳22的最大长度为与阳极极耳22连接的阳极卷绕部101b的宽度W的28％～29％，阳极极耳22的最小长度为与阳极极耳22连接的阳极卷绕部101b的宽度W的19％～20％；层叠设置的多个阳极极耳22的长度L沿由内圈向外圈方向按等差尺寸逐层递减。
请参阅图6，图6是本申请提供的卷绕式电芯的第二实施例的俯视示意图。
参见图6，本实施例提供的卷绕式电芯100与图2提供的卷绕式电芯100的区别之处在于：本实施例中，一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的一 侧连接两个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的两个阴极极耳21沿主体部10的厚度方向H轴对称设置；且，每个阳极卷绕部101b连接有一个阳极极耳22。
本实施例中，多个阴极极耳21的数量较每圈阴极卷绕部101a仅设置一个阴极极耳21时的数量增加，增加了卷绕式电芯100的过流面积，降低了卷绕式电芯100的内阻，且多个阴极极耳21的数量不至于出现过多的阴极极耳21与导电连接焊接接头出现层间虚焊的问题。
请参阅图7，图7是本申请提供的卷绕式电芯的第三实施例的俯视示意图。
参见图7，本实施例所示的卷绕式电芯100与图2所示的卷绕式电芯100的区别之处在于：本实施例提供的卷绕式电芯100中，一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21。且，一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22。
上述实施例中，多个阴极极耳21与多个阳极极耳22的数量均增加，共同提高卷绕式电芯100的整体过流面积，避免了过多的阴极极耳21、阳极极耳22与导电连接焊接接头出现层间虚焊，且多个阴极极耳21与多个阳极极耳22的数量的增加趋势相同，对于卷绕式电芯100的整体过流能力的提高具有协同作用。
在一些实施例中，沿由内圈向外圈方向，第奇数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21，第偶数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21。或，第奇数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，第偶数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21。和/或，沿由内圈向外圈方向，第奇数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22，第偶数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22；或，第奇数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，第偶数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22。
请参阅图8，图8是本申请提供的卷绕式电芯的第四实施例的俯视示意图。
参见图8，本实施例所示的卷绕式电芯100与图2所示的卷绕式电芯100的区别之处在于：本实施例中，沿由内圈向外圈方向，第奇数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21，第偶数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，且每圈阳极卷绕部101b的一侧连接一个阳极极耳22。这种设置方式，一方面实现了增加卷绕式电芯100的过流面积的效果，另一方面使得多个阴极极耳21的分布均衡，提升多个阴极极耳21的焊接效果。
请参阅图9，图9是本申请提供的卷绕式电芯的第五实施例的俯视示意图。
参见图9，本实施例所示的卷绕式电芯100与图2所示的卷绕式电芯100的区别之处在于：本实施例中，沿由内圈向外圈方向，第奇数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22，第偶数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，且每圈阴极卷绕部101a的一侧连接一个阴极极耳21。这种设置方式，一方面实现了增加卷绕式电芯100的过流面积的效果，另一方面使得多个阳极极耳22的分布均衡，提升多个阳极极耳22的焊接效果。
请参阅图10，图10是本申请提供的卷绕式电芯的第六实施例的俯视示意图。
参见图10，本实施例所示的卷绕式电芯100与图2所示的卷绕式电芯100的区别之处在于：本实施例中，沿由内圈向外圈方向，第奇数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22，第偶数圈的阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22。且沿由内圈向外圈方向，第奇数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21，第偶数圈的阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，且每圈阳极卷绕部101b的一侧连接一个阳极极耳22。这种设置方式，一方面实现了增加卷绕式电芯100的过流面积的效果，另一方面使得多个阴极极耳21和阳极极耳22的分布均衡，提升多个阴极极耳21和阳极极耳22的焊接效果。
请参阅图11，图11是本申请提供的电池的结构示意图。
参见图11，本申请提供一种电池200，包括外壳210和上述任一的卷绕式电芯100。
本实施例中，电池200表示包括一个或多个卷绕式电芯100(如图1～图10所示)以提供更高的电压和容量的单一的物理模块。卷绕式电芯100包括主体部10和极耳部20。其中，主体部10包括阴极极片11、阳极极片12和隔膜13。隔膜13层叠设于阴极极片11和阳极极片12之间。主体部10绕虚拟轴线Y卷绕形成扁平状卷绕体。主体部10沿卷绕方向包括有多圈卷绕部101。卷绕部101包括阴极卷绕部101a、阳极卷绕部101b和隔膜卷绕部101c。极耳部20连接于主体部10的一侧，包括多个阴极极耳21和多个阳极极耳22。
其中，一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接一个阴极极耳21，另一部分阴极卷绕部101a中的每个阴极卷绕部101a的一侧连接两个阴极极耳21。另一部分阴极卷绕部101a中的每个阴极卷绕部101a的两个阴极极耳21沿主体部10的厚度H方向位于虚拟轴线Y的相对两侧。
和/或，一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接一个阳极极耳22，另一部分阳极卷绕部101b中的每个阳极卷绕部101b的一侧连接两个阳极极耳22。另一部分阳极卷绕部101b中的每个阳极卷绕部101b的两个阳极极耳22沿主体部10的厚度方向位于虚拟轴线Y的相对两侧。
请参阅图12，图12是本申请提供的电池组件的结构示意图。
参见图12，本申请提供一种电池组件300，包括上述电池200。电池组件300 还可包括箱体，用于为电池200提供容纳空间，箱体可为多种形状。电池组件300中，多个电池200之间可串联或并联或混联，混联是指多个电池200中既有串联又有并联。多个电池200之间可直接串联或并联或混联在一起，再将多个电池200构成的整体容纳于箱体内；当然，电池组件300也可以是多个电池200先串联或并联或混联组成电池模块形式，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体内。电池组件300还可以包括其他结构，例如，该电池组件300还可以包括汇流部件，用于实现多个电池200之间的电连接。其中，每个电池200可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。
请参阅图13，图13是本申请提供的用电装置的结构示意图。
参见图13，本申请提供一种用电装置，包括上述电池组件300。
用电装置可以为手机、电脑、电动摩托、电动汽车等。本实施例以电动汽车400为例进行说明。电动汽车400的内部设置有电池组件300，电池组件300可以设置在电动汽车400的底部或头部或尾部。电池组件300可以用于电动汽车400的供电，例如，电池组件300可以作为电动汽车400的操作电源。电动汽车400还可以包括控制器401和马达402，控制器401用来控制电池组件300为马达402供电，例如，用于电动汽车400的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池组件300不仅可以作为电动汽车400的操作电源，还可以作为电动汽车400的驱动电源，为电动汽车400提供驱动动力。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
以上所述仅为本申请的实施方式，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。

Claims (17)

  1. 一种卷绕式电芯，其中，包括：
    主体部，包括阴极极片、阳极极片和隔膜；所述隔膜层叠设于所述阴极极片和所述阳极极片之间；所述主体部绕虚拟轴线卷绕形成扁平状卷绕体；所述主体部沿卷绕方向包括有多圈卷绕部；所述卷绕部包括阴极卷绕部、阳极卷绕部和隔膜卷绕部；
    极耳部，连接于所述主体部的一侧，包括多个阴极极耳和多个阳极极耳；
    其中，一部分所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接一个所述阴极极耳，另一部分所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接两个所述阴极极耳；所述另一部分所述阴极卷绕部中的每个所述阴极卷绕部的两个所述阴极极耳沿所述主体部的厚度方向位于所述虚拟轴线的相对两侧；和/或，
    一部分所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接一个所述阳极极耳，另一部分所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接两个所述阳极极耳；所述另一部分所述阳极卷绕部中的每个所述阳极卷绕部的两个所述阳极极耳沿所述主体部的厚度方向位于所述虚拟轴线的相对两侧。
  2. 根据权利要求1所述的卷绕式电芯，其中，一部分所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接一个所述阴极极耳，另一部分所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接两个所述阴极极耳，所述另一部分所述阴极卷绕部中的每个所述阴极卷绕部的两个所述阴极极耳沿所述主体部的厚度方向轴对称设置；且，每个所述阳极卷绕部连接有一个所述阳极极耳。
  3. 根据权利要求1或2所述的卷绕式电芯，其中，一部分所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接一个所述阳极极耳，另一部分所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接两个所述阳极极耳，所述另一部分所述阳极卷绕部中的每个所述阳极卷绕部的两个所述阳极极耳沿所述主体部的厚度方向轴对称设置；且，每个所述阴极卷绕部连接有一个所述阴极极耳。
  4. 根据权利要求1-3中任一项所述的卷绕式电芯，其中，沿由内圈向外圈方向，前半数的所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接两个所述阴极极耳，后半数的所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接一个所述阴极极耳；和/或，
    沿由内圈向外圈方向，前半数的所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接两个所述阳极极耳，后半数的所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接一个所述阳极极耳。
  5. 根据权利要求1-4中任一项所述的卷绕式电芯，其中，沿由内圈向外圈方向，第奇数圈的所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接两个所述阴极极耳，第偶数圈的所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接一个所述阴极极耳；或，第奇数圈的所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接一个所述阴极极耳，第偶数圈的所述阴极卷绕部中的每个所述阴极卷绕部的一侧连接两个所述阴极极耳；和/或，
    沿由内圈向外圈方向，第奇数圈的所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接两个所述阳极极耳，第偶数圈的所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接一个所 述阳极极耳；或，第奇数圈的所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接一个所述阳极极耳，第偶数圈的所述阳极卷绕部中的每个所述阳极卷绕部的一侧连接两个所述阳极极耳。
  6. 根据权利要求1-5中任一项所述的卷绕式电芯，其中，所述阴极极片包括阴极集流体和设置在阴极集流体一侧的阴极活性物质层；所述阳极极片包括阳极集流体和设置在阳极集流体一侧的阳极活性物质层；
    所述阴极极耳的一端与对应的所述阴极卷绕部的所述阴极集流体连接，另一端沿着所述虚拟轴线远离所述阴极集流体；所述阳极极耳的一端与对应的所述阳极卷绕部的所述阳极集流体连接，另一端沿着所述虚拟轴线远离所述阳极集流体；沿所述主体部的厚度方向，位于所述虚拟轴线同一侧的多个所述阴极极耳层叠设置，位于所述虚拟轴线同一侧的多个所述阳极极耳层叠设置。
  7. 根据权利要求6所述的卷绕式电芯，其中，所述阴极极耳的厚度与所述阴极集流体的厚度相同；所述阳极极耳的厚度与所述阳极集流体的厚度相同。
  8. 根据权利要求6或7所述的卷绕式电芯，其中，在所述虚拟轴线方向，层叠设置的多个所述阴极极耳为等长极耳或渐变长度极耳；在所述虚拟轴线方向，层叠设置的多个所述阳极极耳为等长极耳或渐变长度极耳。
  9. 根据权利要求8所述的卷绕式电芯，其中，层叠设置的多个所述阴极极耳为等长极耳，所述阴极极耳的长度为与所述阴极极耳连接的所述阴极卷绕部的宽度的28％～29％；层叠设置的多个所述阳极极耳为等长极耳，所述阳极极耳的长度为与所述阳极极耳连接的所述阳极卷绕部的宽度的28％～29％。
  10. 根据权利要求8所述的卷绕式电芯，其中，层叠设置的多个所述阴极极耳为渐变长度极耳，多个所述阴极极耳中，所述阴极极耳的最大长度为与所述阴极极耳连接的所述阴极卷绕部的宽度的28％～29％，所述阴极极耳的最小长度为与所述阴极极耳连接的所述阴极卷绕部的宽度的19％～20％；层叠设置的多个所述阴极极耳的长度沿由内圈向外圈方向按等差尺寸逐层递减；
    层叠设置的多个所述阳极极耳为渐变长度极耳，多个所述阳极极耳中，所述阳极极耳的最大长度为与所述阳极极耳连接的所述阳极卷绕部的宽度的28％～29％，所述阳极极耳的最小长度为与所述阳极极耳连接的所述阳极卷绕部的宽度的19％～20％；层叠设置的多个所述阳极极耳的长度沿由内圈向外圈方向按等差尺寸逐层递减。
  11. 根据权利要求6-10中任一项所述的卷绕式电芯，其中，所述阴极极耳远离所述阴极集流体的一端的宽度为所述扁平状卷绕体的最内圈所述卷绕部的周长的10％～12.5％，所述阴极极耳连接所述阴极卷绕部的一端的宽度为所述扁平状卷绕体的最内圈所述卷绕部的周长的11％～14％。
  12. 根据权利要求1-11中任一项所述的卷绕式电芯，其中，所述扁平状卷绕体具有长度方向和宽度方向；所述虚拟轴线平行于所述宽度方向；所述阳极极片的宽度大于所述阴极极片的宽度，所述阳极极片的长度大于所述阴极极片的长度。
  13. 根据权利要求1-12中任一项所述的卷绕式电芯，其中，所述扁平状卷绕体的最内圈为部分所述阳极卷绕部；所述扁平状卷绕体的最外圈为部分所述阳极卷绕部。
  14. 根据权利要求1-13中任一项所述的卷绕式电芯，其中，所述阴极卷绕部中的每个所 述阴极卷绕部的一侧均连接一个或两个所述阴极极耳；所述阳极卷绕部中的每个所述阳极卷绕部的一侧均连接一个或两个所述阳极极耳；或，
    所述阴极卷绕部中的每个所述阴极卷绕部的一侧均连接一个或两个所述阴极极耳；所述阳极卷绕部中，最内圈的所述阳极卷绕部或最外圈的所述阳极卷绕部不设置所述阳极极耳，其它所述阳极卷绕部的一侧均连接一个或两个所述阳极极耳。
  15. 一种电池，其中，包括权利要求1～14中任一项所述的卷绕式电芯。
  16. 一种电池组件，其中，包括权利要求15所述的电池。
  17. 一种用电装置，其中，包括权利要求16所述的电池组件。
PCT/CN2023/120176 2022-10-26 2023-09-20 卷绕式电芯、电池、电池组件及用电装置 WO2024087957A1 (zh)

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