WO2023185191A1 - 电芯以及电池 - Google Patents

电芯以及电池 Download PDF

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Publication number
WO2023185191A1
WO2023185191A1 PCT/CN2023/070643 CN2023070643W WO2023185191A1 WO 2023185191 A1 WO2023185191 A1 WO 2023185191A1 CN 2023070643 W CN2023070643 W CN 2023070643W WO 2023185191 A1 WO2023185191 A1 WO 2023185191A1
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WIPO (PCT)
Prior art keywords
insulating sheet
pole piece
battery core
insulating
tab
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/070643
Other languages
English (en)
French (fr)
Inventor
徐腾飞
杨赛男
彭宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Cosmx Battery Co Ltd
Original Assignee
Zhuhai Cosmx Battery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuhai Cosmx Battery Co Ltd filed Critical Zhuhai Cosmx Battery Co Ltd
Publication of WO2023185191A1 publication Critical patent/WO2023185191A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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

  • This application relates to the field of battery technology, specifically to a battery core and a battery.
  • Batteries include cells.
  • the battery core includes positive electrode sheets, separators and negative electrode sheets.
  • the separator is located between the positive and negative electrode plates.
  • the positive electrode plate has positive tabs.
  • the negative plate has negative tabs.
  • the structure of the battery cell usually adopts a lug-centered structure.
  • the middle-mounted pole tab structure is to weld the positive pole tab and the negative pole tab to the middle area of the pole piece respectively, thereby optimizing the distribution of current density on the pole piece during the battery charging and discharging process, reducing the internal resistance of the battery, and realizing fast charging of the battery.
  • the present application provides a battery core and a battery that can solve the problem of the positive electrode tab or the negative electrode tab piercing the separator, causing a short circuit in the connection between the positive electrode piece and the negative electrode piece.
  • this application provides a battery core, which includes:
  • the first pole piece includes a first tab and a first active material layer, the first active material layer includes a first mounting groove, and at least part of the first tab is disposed in the first mounting groove;
  • the second pole piece includes a second tab and a second active material layer, the second active material layer includes a second installation groove, and at least part of the second tab is disposed in the second installation groove;
  • first diaphragm disposed between the first pole piece and the second pole piece
  • the first insulating component is disposed between the first pole piece and the second pole piece.
  • the first insulating component includes a first insulating sheet.
  • the first insulating sheet is disposed on a side surface of the second pole piece close to the first diaphragm. In the thickness direction, the orthographic projections of the first mounting groove and the second mounting groove are located within the orthographic projection of the first insulating sheet.
  • the first insulating sheet can effectively prevent the burrs or metal solder joints of the second tab in the second installation groove from piercing the first separator and connect to the first active material layer of the first pole piece. It will cause a short circuit inside the battery core, and at the same time, it can also prevent the burrs or metal solder joints of the first pole tab in the first installation slot from piercing the second insulating sheet and the first diaphragm in turn, and the contact with the second pole piece can be avoided.
  • the connection of the second active material layer causes a short circuit inside the cell.
  • the first active material layer includes two first installation grooves, and the two first installation grooves are arranged oppositely along the thickness direction of the first pole piece, wherein the first pole tab is located away from the first insulating piece. of the first mounting slot.
  • the first insulating component includes a second insulating sheet, the second insulating sheet is disposed between the first diaphragm and the first pole piece and is disposed corresponding to the first installation slot close to the first insulating sheet.
  • the orthographic projection of the second insulating sheet is located within the orthographic projection of the first insulating sheet.
  • the second active material layer includes two second installation grooves, and the two second installation grooves are arranged oppositely along the thickness direction of the second pole piece, wherein the second pole tab is located away from the first insulating piece. second mounting slot.
  • the first insulating component further includes a third insulating sheet, the third insulating sheet is disposed between the first diaphragm and the first pole piece, and the third insulating sheet is close to the second installation slot of the second insulating sheet.
  • the size of the third insulating sheet is 0.5 times to 1 times the size of the second installation groove.
  • the second insulating sheet and the third insulating sheet have an integrated structure.
  • the battery core further includes a second insulating component and a third insulating component
  • the second insulating component is disposed on the side of the second pole piece facing away from the first mounting slot;
  • the third insulating component is disposed on the side of the first pole piece facing away from the second installation slot.
  • the battery core further includes a second diaphragm.
  • the first pole piece and the second pole piece are each provided with a second diaphragm on a side facing away from the first diaphragm.
  • the second insulating component includes a fourth insulating sheet and A second separator is disposed between the fifth insulating sheet, the fourth insulating sheet and the fifth insulating sheet, and the fourth insulating sheet is disposed between the second separator and the second pole piece.
  • the orthographic projection of the fifth insulating sheet is located within the orthographic projection of the fourth insulating sheet.
  • the second active material layer includes two second installation grooves, and the two second installation grooves are arranged oppositely along the thickness direction of the second pole piece, wherein the second pole tab is located away from the second insulating piece.
  • the second installation slot, the first insulating component also includes a third insulating piece, the third insulating piece is arranged on the side of the first insulating piece facing the second pole piece and is arranged corresponding to the second installation slot close to the second insulating piece,
  • the orthographic projection of the third insulating sheet is located within the orthographic projection of the second mounting groove.
  • the battery core further includes a second diaphragm.
  • the first pole piece and the second pole piece are each provided with a second diaphragm on a side facing away from the first diaphragm.
  • the second insulating component includes a fourth insulating sheet and The fifth insulating sheet, the fourth insulating sheet and the fifth insulating sheet are all located between the second pole piece and the second diaphragm, and the fourth insulating sheet is arranged between the fifth insulating sheet and the second pole piece.
  • the orthographic projection of the fourth insulating sheet is located within the orthographic projection of the fifth insulating sheet.
  • the size of the fourth insulating sheet is 0.5 to 1 times the size of the second installation slot.
  • the size of the fifth insulating sheet exceeds the size of the second installation slot in a range of 1 mm to 15 mm.
  • the battery core further includes a second diaphragm.
  • the first pole piece and the second pole piece are each provided with a second diaphragm on a side facing away from the first diaphragm.
  • the third insulating component includes a sixth insulating sheet and A second separator is disposed between the seventh insulating sheet, the sixth insulating sheet and the seventh insulating sheet, and the sixth insulating sheet is disposed between the second separator and the first pole piece.
  • the orthographic projection of the sixth insulating sheet is located within the orthographic projection of the seventh insulating sheet.
  • the first tab and the second tab are located on the same side of the central axis of the battery core, and the first tab and the second tab are located on the same fold of the battery core.
  • the present application provides a battery including the battery core of the above embodiment.
  • Figure 1 is a schematic diagram of a battery structure according to an embodiment of the present application.
  • Figure 2 is a schematic structural diagram of a battery cell according to an embodiment of the present application.
  • Figure 3 is a partial cross-sectional structural schematic diagram of a battery core according to an embodiment of the present application.
  • Figure 4 is a partial cross-sectional structural schematic diagram of a battery core in the prior art
  • Figure 5 is a partial cross-sectional structural schematic diagram of a battery core according to an embodiment of the present application.
  • Figure 6 is a partial cross-sectional structural diagram of a battery core according to another embodiment of the present application.
  • the first pole 2111.
  • the first pole connection part 2112.
  • the second pole 2211. The second pole connection part; 2212. The second pole lead-out part;
  • Second active material layer 222a. Second installation slot;
  • the second current collector
  • the third insulating component 241.
  • the sixth insulating sheet 242.
  • the seventh insulating sheet 241.
  • the second insulating component 251.
  • the fourth insulating sheet 252.
  • the fifth insulating sheet 251.
  • the first insulating component 261.
  • the first insulating sheet 262.
  • the second insulating sheet 263.
  • Double protective insulation layer 400. Double protective insulation layer
  • the battery 100 mainly relies on the movement of lithium ions between the positive electrode sheet and the negative electrode sheet for charging and discharging.
  • lithium ions are deintercalated from the positive electrode sheet and then embedded into the negative electrode sheet through the separator.
  • the active material content on the negative electrode sheet is lower than the active material content on the positive electrode sheet, the lithium ions deintercalated from the positive electrode sheet cannot be embedded in the negative electrode sheet, and lithium ions precipitate on the surface of the negative electrode sheet to form lithium dendrites, resulting in precipitation. Lithium phenomenon.
  • the battery 100 in the embodiment of the present application may include a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, or the like. It is not limited in this application.
  • the battery 100 is generally divided into square batteries and soft pack batteries according to the packaging method. There are no limitations in this application either.
  • the devices in the embodiments of this application may be mobile devices such as vehicles, ships, and small aircraft.
  • the vehicle in this application may be a new energy vehicle.
  • the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle.
  • the battery 100 can be used as a driving power source for a vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.
  • the battery 100 provides electrical energy for driving the motor.
  • the drive motor is connected to the wheels on the vehicle through a transmission mechanism to drive the vehicle forward.
  • the battery 100 can be disposed horizontally at the bottom of the vehicle.
  • a battery 100 includes a battery cell 200 .
  • the battery core 200 includes a first pole piece 210, a separator, and a second pole piece 220.
  • the first pole piece 210, the separator and the second pole piece 220 are formed into the battery core 200 using a winding process.
  • the first pole piece 210 includes a first tab 211 and a first current collector 213 .
  • the second pole piece 220 includes a second tab 221 and a second current collector 223 .
  • the first tab 211 and the second tab 221 are used to connect to external circuits.
  • the first tab 211 includes a first tab connection part 2111 and a first tab lead-out part 2112.
  • the first tab connection part 2111 is used to connect with the first current collector 213 .
  • the first tab lead-out portion 2112 is located outside the first current collector 213 .
  • the second tab 221 includes a second tab connection part 2211 and a second tab lead-out part 2212.
  • the second tab connection part 2211 is used to connect with the second current collector 223 .
  • the second tab lead-out portion 2212 is located outside the second current collector 223 .
  • the second tab lead-out part 2212 and the first tab lead-out part 2112 are used to connect external circuits.
  • the structure of the cell 200 of the battery 100 usually adopts a middle-mounted tab structure.
  • the pole-in-center structure means that the first pole 211 and the second pole 221 are respectively drawn from the middle area close to the first active material layer 212 and the second active material layer 222, thereby optimizing the pole piece during the charging and discharging process of the battery 100.
  • the distribution of current density reduces the internal resistance of the battery 100 and enables fast charging of the battery 100 .
  • first tab 211 and the second tab 221 are welded to the first active material layer 212 and the second active material layer 222 respectively, resulting in solder joints and burrs existing in the first tab 211 and the second tab 221 themselves.
  • the separator is easily punctured, causing the first pole piece 210 and the second pole piece 220 to be connected and short-circuited, affecting the safety of the battery 100 .
  • the applicant improved the structure of the battery core 200.
  • the embodiments of the present application are further described below.
  • the battery core 200 in the embodiment of the present application includes a first pole piece 210 , a second pole piece 220 , a first separator 230 and a first insulating component 260 .
  • the first pole piece 210 includes a first tab 211 and a first active material layer 212 .
  • the first active material layer 212 includes a first mounting groove 212a.
  • the first mounting groove 212a penetrates the first active material layer 212.
  • At least part of the first tab 211 is disposed in the first mounting groove 212a. It should be noted that the portion of the first tab 211 located in the first mounting groove 212a is the first tab connection portion 2111.
  • the first pole piece 210 includes a first active material layer 212 and a first current collector 213 .
  • First active material layers 212 are provided on both surfaces of the first current collector 213 .
  • the first mounting groove 212a is provided in the first active material layer 212.
  • the first current collector 213 is exposed from the first mounting groove 212a and is connected to the first tab connecting portion 2111.
  • the second pole piece 220 includes a second tab 221 and a second active material layer 222 .
  • the second active material layer 222 includes a second mounting groove 222a.
  • the second mounting groove 222a penetrates the second active material layer 222.
  • At least part of the second tab 221 is disposed in the second mounting groove 222a. It should be noted that the portion of the second tab 221 located in the first mounting groove 212a is the second tab connection portion 2211.
  • the second active material layer 222 includes a second current collector 223 and . Second active material layers 222 are provided on both surfaces of the second current collector 223 .
  • the second mounting groove 222a is provided in the second active material layer 222.
  • the second current collector 223 is exposed from the second mounting groove 222a and is connected to the second tab connecting portion 2211.
  • the first diaphragm 230 is disposed between the first pole piece 210 and the second pole piece 220 to insulate the first pole piece 210 and the second pole piece 220 .
  • the first insulation component 260 is disposed between the first pole piece 210 and the second pole piece 220 .
  • the first insulation component 260 includes a first insulation sheet 261 and a second insulation sheet 262 .
  • the first insulating sheet 261 is disposed on a side surface of the second pole piece 220 close to the first diaphragm 230 .
  • the first insulating sheet 261 can effectively prevent the burrs or metal solder joints of the second pole tab 221 in the second installation groove 222a from piercing the first diaphragm 230 and connecting with the first active material layer 212 of the first pole piece 210 to cause A short circuit occurs inside the battery core 200.
  • the connection of the second active material layer 222 of the diode piece 220 causes a short circuit inside the battery core 200 .
  • the first insulating sheet 261 in the embodiment of the present application may have an integral structure, and the orthographic projections of the first mounting groove 212a and the second mounting groove 222a are located within the orthographic projection of the first insulating sheet 261.
  • a second pole piece insulating layer 300 is provided on the second pole piece 220 at a position corresponding to the second pole tab 221 .
  • the second pole piece insulating layer 300 is located between the second pole piece 220 and the separator.
  • a double protective insulating layer 400 is provided on the first pole piece 210 at a position corresponding to the second pole tab 221 .
  • the double protective insulation layer 400 is located between the separator and the second pole piece 220 .
  • the second pole piece insulation layer 300 and the double protection insulation layer 400 are separate structures.
  • the second pole piece insulation layer 300 and the double protection insulation layer 400 is subjected to the extrusion force of the winding during the winding process of the battery core 200, along the thickness direction
  • the thickness of the core 200 in this overlapping area will be larger, resulting in a larger overall thickness range of the battery core 200 .
  • the overall range of the thickness of the battery core 200 refers to the difference between the maximum value and the minimum value of the thickness of the battery core 200 .
  • a large difference in the overall thickness of the battery core 200 will result in the internal winding of the battery core 200 not being tight after the winding process, thereby increasing the gap between the first pole piece 210, the separator and the second pole piece 220, and resulting in poor consistency.
  • the movement path of lithium ions is long, and even because of the large gap, lithium ions cannot be embedded. Eventually, lithium precipitation occurs on the surface of the pole piece with negative polarity.
  • the first insulating sheet 261 in the embodiment of the present application is subjected to the rolling extrusion force during the winding process of the battery core 200, the first insulating sheet 261 is less likely to overlap, which is beneficial to reducing the overall thickness difference of the battery core 200. Larger battery cells lead to poor flatness, poor consistency of the formation interface, and the possibility of lithium precipitation.
  • the first mounting groove 212a may be formed by removing part of the first active material layer 212 on the surface of the first current collector 213 through laser cleaning or a scraping process. For example, the bottom wall of the first installation groove 212a is cleaned and the first current collector 213 is exposed, thereby preventing the residual first active material layer 212 in the first installation groove 212a from affecting the first tab connection part 2111 and the first current collector. Connection stability between fluids 213.
  • the second mounting groove 222a may be formed by removing part of the second active material layer 222 on the surface of the second current collector 223 through laser cleaning or a scraping process.
  • the bottom wall of the second installation groove 222a is cleaned and the second current collector 223 is exposed, thereby preventing the residual second active material layer 222 in the second installation groove 222a from affecting the second tab connection part 2211 and the second current collector. Connection stability between fluids 223.
  • the first tab connecting portion 2111 and the first current collector 213 are connected by welding, for example, laser welding or ultrasonic welding.
  • the welding equipment acts on the surface of the second tab connection part 2211 facing away from the second current collector 223, and connects the second tab connection part 2211 to the second current collector 223.
  • the current collector 223 is welded together, and a welding point is formed in the second mounting groove 222a of the second active material layer 222 where the second tab connecting portion 2211 is not provided.
  • the solder joints easily penetrate the first separator 230 and connect with the first pole piece 210 , causing a short circuit of the battery core 200 .
  • the first insulating component 260 covers the side of the second current collector 223 that is not provided with the second tab connection portion 2211, which can effectively avoid the occurrence of solder joints after the second tab connection portion 2211 and the second current collector 223 are welded. Penetrating the first separator 230 and connecting with the first active material layer 212 causes a short circuit problem in the battery core 200 .
  • the first active material layer 212 includes two first installation grooves 212a.
  • the two first mounting grooves 212a are arranged oppositely along the thickness direction of the first pole piece 210.
  • the first tab 211 is located in the first installation groove 212a away from the first insulating sheet 261 .
  • the first insulation component 260 includes a second insulation sheet 262 .
  • the second insulating sheet 262 is disposed between the first diaphragm 230 and the first pole piece 210 and is disposed corresponding to the first mounting groove 212a close to the first insulating sheet 261 .
  • the first tab connecting portion 2111 is located in the first mounting groove 212a of the first pole piece 210 away from the first diaphragm 230.
  • the second insulating sheet 262 covers the first current collector 213 exposed in the first mounting groove 212a. That is, the second insulating sheet 262 covers the first mounting groove 212a on the first pole piece 210 where the first tab connecting portion 2111 is not provided.
  • the second insulating sheet 262 can effectively prevent the metal solder joints in the first installation groove 212a from piercing the first diaphragm 230 and causing a short circuit connection between the first tab 211 and the second active material layer 222 of the second pole piece 220, resulting in electrical failure.
  • a short circuit occurs inside the core 200.
  • the orthographic projection of the second insulating sheet 262 is located within the orthographic projection of the first insulating sheet 261 .
  • first pole piece 210 has negative polarity.
  • the second pole piece 220 has positive polarity.
  • the area covered by an insulating sheet 261 causes the lithium ions deintercalated from the second active material layer 222 containing the positive active material to be unable to be embedded in the first active material layer 212 containing the negative active material, and on the first pole piece 210 The phenomenon of lithium precipitation. Therefore, the orthographic projection of the second insulating sheet 262 is located within the orthographic projection of the first insulating sheet 261 to avoid the lithium precipitation phenomenon.
  • the second active material layer 222 includes two second installation grooves 222a.
  • the two second mounting grooves 222a are arranged oppositely along the thickness direction X of the second pole piece 220 .
  • the second tab 221 is located in the second installation groove 222a away from the second insulating sheet 262 .
  • the first insulation component 260 also includes a third insulation sheet 263.
  • the third insulating sheet 263 is disposed between the first diaphragm 230 and the first pole piece 210 and is disposed corresponding to the second mounting groove 222a close to the first insulating sheet 261 .
  • the first insulating sheet 261 and the third insulating sheet 263 can provide double protection to the first tab 211 , thereby helping to avoid burrs on the second tab connecting portion 2211 itself or on the second tab connecting portion 2211 and the second current collector 223
  • the solder joints generated by welding sequentially pierce the first insulating sheet 261 and the first separator 230 and come into contact with the first active material layer 212, causing a short circuit inside the battery core 200.
  • the second tab connecting portion 2211 is located in the second mounting groove 222a of the second pole piece 220 away from the first diaphragm 230 .
  • the third insulating sheet 263 covers the second current collector 223 exposed in the second mounting groove 222a. That is, the third insulating sheet 263 covers the second mounting groove 222a of the second pole piece 220 that is not provided with the second tab connecting portion 2211.
  • the first insulating sheet 261 and the third insulating sheet 263 can provide double protection to the first tab 211 , thereby helping to avoid burrs on the second tab connecting portion 2211 itself or on the second tab connecting portion 2211 and the second current collector 223
  • the solder joints generated by welding pierce the first insulating sheet 261 and the first separator 230 in sequence, and come into contact with the first active material layer 212 to cause a short circuit inside the battery core 200 .
  • the size of the third insulating sheet 263 is 0.5 times to 1 times the size of the second mounting groove 222a.
  • the second insulating sheet 262 may cover the solder joints of the first mounting groove 212a.
  • the size of the second insulating sheet 262 can be larger than the size of the first installation groove 212a, so that the second insulating sheet 262 is closely connected to the first pole piece 210, and the second insulating sheet 262 is reduced from detaching during the winding process of the battery core 200, resulting in the third If the two insulating pieces 262 fail, the metal solder joints in the first mounting groove 212a may pierce the first diaphragm 230, resulting in a short circuit between the first tab 211 and the second active material layer 222 of the second pole piece 220.
  • the second insulating sheet 262 and the third insulating sheet 263 have an integrated structure.
  • the integrated structure can prevent the second insulating sheet 262 and the third insulating sheet 263 from overlapping after being subjected to the extrusion force of the winding during the winding process of the battery core 200, thereby occupying the space of the battery core 200 in the thickness direction Energy density reduced by 100.
  • the integrated structure of the second insulating sheet 262 and the third insulating sheet 263 can reduce the type and quantity of the insulating sheets, and prevent the insulating sheets from being misplaced due to too many types of parts, thereby affecting the processing efficiency of the battery 100 .
  • the battery core further includes a second insulating component and a third insulating component.
  • the second insulating component 250 is disposed on the side of the second pole piece 220 facing away from the first mounting groove 212a.
  • the orthographic projection of the second mounting groove 222 a is located within the orthographic projection of the second insulation component 250 .
  • the second tab connection portion 2211 is located in the second installation groove 222a on the second active material layer 222 away from the first diaphragm 230.
  • the second insulating component 250 can cover the surface of the second tab connecting part 2211 facing away from the second current collector 223, thereby preventing the burrs of the second tab connecting part 2211 from connecting with the adjacent first pole piece 210, causing the battery core 200 to short circuit occurs internally.
  • the third insulating component 240 is disposed on the side of the first pole piece 210 facing away from the second mounting groove 222a.
  • the orthographic projection of the first mounting groove 212 a is located within the orthographic projection of the third insulating component 240 .
  • the first tab connection portion 2111 is located in the first installation groove 212a on the first active material layer 212 away from the first diaphragm 230.
  • the third insulating component 240 can cover the surface of the first tab connection part 2111 facing away from the first current collector 213, thereby preventing the burrs of the first tab connection part 2111 from interfacing with the second active material layer of the adjacent second pole piece 220. 222 connection, causing a short circuit inside the battery core 200.
  • the battery core 200 of the embodiment of the present application further includes a second separator 270 .
  • the second separator 270 , the first pole piece 210 , the first separator 230 and the second pole piece 220 are sequentially stacked and then rolled to form the battery core 200 .
  • a second diaphragm 270 is provided on the side of the second pole piece 220 and the first pole piece 210 facing away from the first diaphragm 230 .
  • the second insulation component 250 includes a fourth insulation sheet 251 and a fifth insulation sheet 252 .
  • a second diaphragm 270 is provided between the fourth insulating sheet 251 and the fifth insulating sheet 252 .
  • the fourth insulating sheet 251 is disposed between the second diaphragm 270 and the second pole piece 220 .
  • the second insulation component 250 includes two layers of insulation sheets, namely, a fourth insulation sheet 251 and a fifth insulation sheet 252 .
  • the second tab connection part 2211 is located in the second installation groove 222a of the second active material layer 222 away from the first separator 230.
  • the fourth insulating sheet 251 covers the surface of the second tab connecting portion 2211 facing away from the second current collector 223 , thereby preventing the burrs of the second tab connecting portion 2211 from directly penetrating the second diaphragm 270 and interfacing with the second diaphragm 270 away from the first diaphragm 230 .
  • One pole piece 210 is connected, causing a short circuit inside the battery core 200 .
  • the orthographic projection of the fifth insulating sheet 252 is located within the orthographic projection of the fourth insulating sheet 251 .
  • first active material layer 212 includes a negative active material.
  • the second active material layer 222 contains a negative active material.
  • the fourth insulating sheet 251 covers the second active material layer 222, and the fifth insulating sheet 252 covers the first active material layer 212. Therefore, the area of the fifth insulating sheet 252 covering the first active material layer 212 is smaller than that of the fourth insulating sheet 251 covering the first active material layer 212.
  • the area of the active material layer 222 can avoid the occurrence of lithium precipitation.
  • the first insulation component 260 further includes a third insulation sheet 263 .
  • the third insulating sheet 263 is disposed on the side of the first insulating sheet 261 facing the second pole piece 220 and is disposed corresponding to the second mounting groove 222a.
  • the orthographic projection of the third insulating sheet 263 is located within the orthographic projection of the first insulating sheet 261 .
  • the orthographic projection of the third insulating sheet 263 is located outside the orthographic projection of the second insulating sheet 262 .
  • the third insulating sheet 263 covers the area of the second current collector 223 exposed to the second mounting groove 222a. Since the third insulating sheet 263 is provided, the solder joints produced by the welding of the second tab connection part 2211 and the second current collector 223 need to pierce the third insulating sheet 263, the first insulating sheet 261 and the first diaphragm 230 in sequence before they can contact with the first separator 230. The first active material layer 212 is in contact, so the first insulating sheet 261 and the third insulating sheet 263 can form double protection, which is helpful to avoid short circuit of the battery core 200 .
  • first pole piece 210 has negative polarity.
  • the second pole piece 220 has positive polarity.
  • the orthographic projection of the third insulating sheet 263 and the orthographic projection of the second insulating sheet 262 are both located inside the orthographic projection of the first insulating sheet 261 .
  • the third insulating sheet covers the second active material layer 222 containing the positive active material, and both the second insulating sheet 262 and the third insulating sheet 263 cover the first active material layer 212 containing the negative active material, the third insulating sheet
  • the orthographic projection of 263 and the orthographic projection of the second insulating sheet 262 are both located inside the orthographic projection of the first insulating sheet 261 to avoid the area of the first active material layer 212 being covered by the second insulating sheet 262 and the third insulating sheet 263 is smaller than the area of the second active material layer 222 covered by the first insulating sheet 261 , causing the lithium ions deintercalated from the second active material layer 222 to be unable to be embedded in the first active material layer 212 and remain on the first pole piece 210 The lithium precipitation phenomenon occurs.
  • the size of the second insulating sheet 262 may be smaller than or equal to the first mounting groove 212a, so that along the thickness direction X, the second insulating sheet 262 is completely located inside the first mounting groove 212a.
  • the thickness of the second insulating sheet 262 does not occupy the space of the battery core 200 in the thickness direction X. Under the condition that the battery core 200 has a certain volume, the battery core 200 can be wound more tightly inside, thereby helping to increase the energy density of the battery 100 .
  • the battery core 200 further includes a second separator 270 .
  • a second diaphragm 270 is provided on the side of the second pole piece 220 and the first pole piece 210 facing away from the first diaphragm 230 .
  • the second insulation component 250 includes a fourth insulation sheet 251 and a fifth insulation sheet 252 .
  • the fourth insulating sheet 251 and the fifth insulating sheet 252 are both located between the second pole piece 220 and the second diaphragm 270 , and the fourth insulating sheet 251 is disposed between the fifth insulating sheet 252 and the second pole piece 220 .
  • the second tab connection portion 2211 is located in the second mounting groove 222a of the second active material layer 222 facing the second diaphragm 270.
  • the function of the fourth insulating sheet 251 is to prevent the burrs of the second tab 221 from piercing the second diaphragm 270 and contacting the first active material layer 212 away from the first diaphragm 230 to cause a short circuit.
  • the fourth insulating sheet 251 and the fifth insulating sheet 252 can provide double protection to the second tab connecting part 2211.
  • the size of the fifth insulating sheet 252 along the length direction Y can also be set smaller, so that the fourth insulating sheet 251 and The area of the fifth insulating sheet 252 acting on the second pole piece 220 is as small as possible, so that the area covered by the fourth insulating sheet 251 and the fifth insulating sheet 252 on the second active material layer 222 is small.
  • the second active material layer 222 contains a positive active material, the energy density of the battery core 200 can be effectively increased.
  • the orthographic projection of the fourth insulating sheet 251 is located within the orthographic projection of the fifth insulating sheet 252 .
  • the fourth insulating sheet 251 covers the second tab connection portion 2211.
  • the battery core 200 can be wound more tightly inside, thereby helping to increase the energy density of the battery 100 .
  • the size of the fourth insulating sheet 251 is 0.5 times to 1.5 times the size of the second mounting groove 222a.
  • the fourth insulating sheet 251 may cover the second tab 221 .
  • the size of the fourth insulating sheet 251 is smaller than or equal to the second mounting groove 222a, so that along the thickness direction X, the fourth insulating sheet 251 is completely located inside the second mounting groove 222a.
  • the thickness of the fourth insulating sheet 251 does not occupy the space of the battery core 200 in the thickness direction X. Under the condition that the battery core 200 has a certain volume, the battery core 200 can be wound more tightly inside, thereby helping to increase the energy density of the battery 100 .
  • the size of the fifth insulating sheet 252 exceeds the value range of the size of the second mounting groove 222a by 1 mm to 15 mm.
  • both sides of the surface of the fifth insulating sheet 252 facing the second active material layer 222 can be closely connected with the second active material layer 222 , so that the fifth insulating sheet can be lowered during the winding process of the battery core 200 252 is affected by the force of the second tab 221's own burrs, and the fifth insulating sheet 252 is detached from the second active material layer 222, resulting in poor flatness of the battery core 200 and the possibility of increasing the defective rate of the battery 100.
  • the battery core 200 in the embodiment of the present application further includes a second separator 270 .
  • a second diaphragm 270 is provided on the side of the second pole piece 220 and the first pole piece 210 facing away from the first diaphragm 230 .
  • the third insulation component 240 includes a sixth insulation sheet 241 and a seventh insulation sheet 242 .
  • a second diaphragm 270 is provided between the sixth insulating sheet 241 and the seventh insulating sheet 242 .
  • the sixth insulating sheet 241 is disposed between the second diaphragm 270 and the first pole piece 210 .
  • the third insulation component 240 includes two layers of insulation sheets, namely a sixth insulation sheet 241 and a seventh insulation sheet 242 .
  • the first tab connecting portion 2111 is located in the first mounting groove 212a of the first active material layer 212 away from the first diaphragm 230.
  • the sixth insulating sheet 241 covers the surface of the first tab connection portion 2111 facing away from the first current collector 213 , thereby preventing the burrs of the first tab connection portion 2111 from penetrating the second diaphragm 270 and connecting with the third diaphragm away from the first diaphragm 230 .
  • the diode pieces 220 are connected, causing a short circuit inside the battery core 200 .
  • the orthographic projection of the sixth insulating sheet 241 is located within the orthographic projection of the seventh insulating sheet 242 .
  • first active material layer 212 includes a negative active material.
  • the second active material layer 222 contains a positive active material.
  • the sixth insulating sheet 241 covers the second active material layer 222, and the seventh insulating sheet 242 covers the first active material layer 212. Therefore, the area of the sixth insulating sheet 241 covering the first active material layer 212 is smaller than that of the seventh insulating sheet 242 covering the first active material layer 212.
  • the area of the active material layer 222 can avoid the occurrence of lithium precipitation.
  • first tab 211 and the second tab 221 are located on the same side of the central axis M of the battery core 200 .
  • the first tab 211 and the second tab 221 are located on the same fold of the battery core 200 .
  • the first pole tab 211 and the second pole tab 221 are both arranged below the dividing line N; or, the first pole tab 211 and the second pole tab 221 are both arranged below the dividing line N. above.
  • the first tab 211 and the second tab 221 may be disposed below the dividing line N.
  • the first pole tab 211 and the second pole tab 221 are respectively disposed on the first pole piece 210 and the second pole piece 220 with the first diaphragm 230 in the middle.
  • a part of the first tab 211 of the embodiment of the present application is disposed in the first installation groove 212 a away from the first diaphragm 230 , that is, the first tab connection portion 2111 can It is disposed in the first installation groove 212a away from the first diaphragm 230.
  • a portion of the second tab 221 is disposed in the second mounting groove 222a away from the first diaphragm 230 . That is, the second tab connection part 2211 may be disposed in the second installation groove 222a away from the first diaphragm 230.
  • connection should be understood in a broad sense.
  • it can be a fixed connection or a fixed connection.
  • Indirect connection through an intermediary can be the internal connection between two elements or the interaction between two elements.
  • plural means two or more.
  • the term “and/or” in this article is just an association relationship that describes related objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations.
  • the character "/" in this article generally indicates that the related objects before and after are an “or” relationship; in the formula, the character "/" indicates that the related objects before and after are a "division" relationship.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the implementation of the present application.
  • the implementation of the examples does not constitute any limitations.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请提供一种电芯以及电池。电芯包括第一极片、第二极片、第一隔膜和第一绝缘组件。第一极片包括第一极耳和第一活性物质层。第一活性物质层包括第一安装槽。第一极耳至少部分设置于第一安装槽内。第二极片包括第二极耳和第二活性物质层。第二活性物质层包括第二安装槽。第二极耳的至少部分设置于第二安装槽内。第一隔膜设置于第一极片和第二极片之间。第一绝缘组件设置于第一极片和第二极片之间。第一绝缘组件包括第一绝缘片。第一绝缘片设置于第二极片靠近第一隔膜的一侧表面。第一安装槽以及第二安装槽各自的正投影位于第一绝缘片的正投影内。本申请的电芯以及电池能够解决正极耳或负极耳刺穿隔膜而导致正极片与负极片连接发生短路的问题。

Description

电芯以及电池
本申请要求于2022年03月31日提交中国专利局、申请号为202220734633.5、申请名称为“电芯以及电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，具体涉及一种电芯以及电池。
背景技术
随着科学技术的发展，电池技术也得到了迅速的发展。同时，用户也对电池的快速充电能力提出了更高的要求。目前，快速充电电池已经成为消费类电池最主要的发展方向之一。
电池包括电芯。电芯包括正极片、隔膜以及负极片。隔膜位于正极片和负极片之间。正极片具有正极耳。负极片具有负极耳。为了提升电池的快速充电性能，电池的电芯在结构上通常采用极耳中置结构。极耳中置结构是将正极耳和负极耳分别焊接于极片的中间区域，从而优化电池充放电过程中极片上电流密度的分布，降低电池的内阻，实现电池的快速充电。
然而，正极耳和负极耳分别焊接于正极片和负极片而产生的焊点以及正极耳和负极耳自身存在的毛刺存在将隔膜刺破的风险。示例性地，存在正极耳的焊点刺破隔膜而与负极片连接的可能性，从而导致正极片与负极片连接而发生短路，影响电池的使用安全性。
实用新型内容
本申请提供一种电芯以及电池，能够解决正极耳或负极耳刺穿隔膜而导致正极片与负极片连接发生短路的问题。
一方面，本申请提供一种电芯，其包括：
第一极片，包括第一极耳和第一活性物质层，第一活性物质层包括第一安装槽，第一极耳的至少部分设置于第一安装槽内；
第二极片，包括第二极耳和第二活性物质层，第二活性物质层包括第二安 装槽，第二极耳的至少部分设置于第二安装槽内；
第一隔膜，设置于第一极片和第二极片之间；
第一绝缘组件，设置于第一极片和第二极片之间，第一绝缘组件包括第一绝缘片，第一绝缘片设置于第二极片靠近第一隔膜的一侧表面上，沿厚度方向，第一安装槽以及第二安装槽各自的正投影位于第一绝缘片的正投影内。
本申请提供的电芯，第一绝缘片可以有效避免第二安装槽内的第二极耳自身的毛刺或者金属焊点刺破第一隔膜，而与第一极片的第一活性物质层连接导致电芯内部发生短路的现象，同时，也可以避免第一安装槽内的第一极耳自身的毛刺或者金属焊点依次刺破第二绝缘片和第一隔膜，而与第二极片的第二活性物质层连接导致电芯内部发生短路的现象。
根据本申请的一个实施例，第一活性物质层包括两个第一安装槽，两个第一安装槽沿第一极片的厚度方向相对设置，其中，第一极耳位于远离第一绝缘片的第一安装槽。
根据本申请的一个实施例，第一绝缘组件包括第二绝缘片，第二绝缘片设置于第一隔膜和第一极片之间并且与靠近第一绝缘片的第一安装槽对应设置。
根据本申请的一个实施例，沿厚度方向，第二绝缘片的正投影位于第一绝缘片的正投影内。
根据本申请的一个实施例，第二活性物质层包括两个第二安装槽，两个第二安装槽沿第二极片的厚度方向相对设置，其中，第二极耳位于远离第一绝缘片的第二安装槽。
根据本申请的一个实施例，第一绝缘组件还包括第三绝缘片，第三绝缘片设置于第一隔膜和第一极片之间，第三绝缘片靠近第二绝缘片的第二安装槽对应设置。
根据本申请的一个实施例，沿第二活性物质层的长度方向，第三绝缘片的尺寸为第二安装槽的尺寸的0.5倍至1倍。
根据本申请的一个实施例，第二绝缘片和第三绝缘片为一体结构。
根据本申请的一个实施例，电芯还包括第二绝缘组件和第三绝缘组件；
第二绝缘组件设置于第二极片背向第一安装槽的一侧；
第三绝缘组件设置于第一极片背向第二安装槽的一侧。
根据本申请的一个实施例，电芯还包括第二隔膜，第一极片和第二极片各自背向第一隔膜的一侧设置有第二隔膜，第二绝缘组件包括第四绝缘片和第五绝缘片，第四绝缘片和第五绝缘片之间设置有第二隔膜，第四绝缘片设置于第 二隔膜和第二极片之间。
根据本申请的一个实施例，沿厚度方向，第五绝缘片的正投影位于第四绝缘片的正投影内。
根据本申请的一个实施例，第二活性物质层包括两个第二安装槽，两个第二安装槽沿第二极片的厚度方向相对设置，其中，第二极耳位于远离第二绝缘片的第二安装槽，第一绝缘组件还包括第三绝缘片，第三绝缘片设置于第一绝缘片面向第二极片的一侧并且与靠近第二绝缘片的第二安装槽对应设置，沿厚度方向，第三绝缘片的正投影位于第二安装槽的正投影内。
根据本申请的一个实施例，电芯还包括第二隔膜，第一极片和第二极片各自背向第一隔膜的一侧设置有第二隔膜，第二绝缘组件包括第四绝缘片和第五绝缘片，第四绝缘片和第五绝缘片均位于第二极片和第二隔膜之间，第四绝缘片设置于第五绝缘片和第二极片之间。
根据本申请的一个实施例，沿厚度方向，第四绝缘片的正投影位于第五绝缘片的正投影内。
根据本申请的一个实施例，沿第二活性物质层的长度方向，第四绝缘片的尺寸为第二安装槽的尺寸的0.5倍至1倍。
根据本申请的一个实施例，沿第二活性物质层长度方向，第五绝缘片的尺寸超出第二安装槽的尺寸的取值范围1mm至15mm。
根据本申请的一个实施例，电芯还包括第二隔膜，第一极片和第二极片各自背向第一隔膜的一侧设置有第二隔膜，第三绝缘组件包括第六绝缘片和第七绝缘片，第六绝缘片和第七绝缘片之间设置有第二隔膜，第六绝缘片设置于第二隔膜和第一极片之间。
根据本申请的一个实施例，沿厚度方向，第六绝缘片的正投影位于第七绝缘片的正投影内。
根据本申请的一个实施例，沿厚度方向，第一极耳和第二极耳位于电芯的中心轴线的同一侧，第一极耳和第二极耳位于电芯的同一折上。
另一方面，本申请提供的一种电池，包括如上述实施例的电芯。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
图1为本申请一实施例的电池结构示意图；
图2为本申请一实施例的电芯结构示意图；
图3为本申请一实施例的电芯的局部剖视结构示意图；
图4为现有技术的电芯的局部剖视结构示意图；
图5为本申请一实施例的电芯的局部剖视结构示意图；
图6为本申请另一实施例的电芯的局部剖视结构示意图。
附图标记说明：
100、电池；
200、电芯；
210、第一极片；
211、第一极耳；2111、第一极耳连接部；2112、第一极耳引出部；
212、第一活性物质层；212a、第一安装槽；
213、第一集流体；
220、第二极片；
221、第二极耳；2211、第二极耳连接部；2212、第二极耳引出部；
222、第二活性物质层；222a、第二安装槽；
223、第二集流体；
230、第一隔膜；
240、第三绝缘组件；241、第六绝缘片；242、第七绝缘片；
250、第二绝缘组件；251、第四绝缘片；252、第五绝缘片；
260、第一绝缘组件；261、第一绝缘片；262、第二绝缘片；263、第三绝缘片；
270、第二隔膜；
300、第二极片绝缘层；
400、双重保护绝缘层；
X、厚度方向；
Y、长度方向。
通过上述附图，已示出本申请明确的实施例，后文中将有更详细的描述。这些附图和文字描述并不是为了通过任何方式限制本申请构思的范围，而是通过参考特定实施例为本领域技术人员说明本申请的概念。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描 述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
电池100主要依靠锂离子在正极片和负极片之间的移动进行充电和放电。电池100在充电过程中，锂离子从正极片脱嵌，然后经过隔膜再嵌入负极片。但是，当负极片上的活性物质含量低于正极片上的活性物质含量时，会导致从正极片脱嵌的锂离子无法嵌入负极片，锂离子析出在负极片的表面形成锂枝晶，从而产生析锂现象。
本申请实施例的电池100可以包括锂离子二次电池、锂硫电池或钠锂离子电池等。在本申请中不限定。电池100一般按封装的方式分成方形电池和软包电池。在本申请中也不做限定。
本申请实施例的设备可以为车辆、船舶、小型飞机等移动设备。以车辆为例，本申请的车辆可以是新能源汽车。该新能源汽车可以是纯电动汽车，也可以是混合动力汽车或增程式汽车。电池100可以作为汽车的驱动电源，替代或部分地替代燃油或天然气为车辆提供驱动动力。示例性地，电池100为驱动电机提供电能。驱动电机通过传动机构与车辆上的车轮连接从而驱动车辆行进。具体地，该电池100可水平设置于车辆的底部。
参见图1至图3所示，电池100包括电芯200。电芯200包括第一极片210、隔膜和第二极片220。第一极片210、隔膜和第二极片220采用卷绕的加工工艺形成电芯200。第一极片210包括第一极耳211和第一集流体213。第二极片220包括第二极耳221和第二集流体223。第一极耳211和第二极耳221用于连接外部电路。
第一极耳211包括第一极耳连接部2111和第一极耳引出部2112。第一极耳连接部2111用于与第一集流体213连接。第一极耳引出部2112位于第一集流体213的外部。第二极耳221包括第二极耳连接部2211和第二极耳引出部2212。第二极耳连接部2211用于与第二集流体223连接。第二极耳引出部2212位于第二集流体223的外部。第二极耳引出部2212和第一极耳引出部2112用于连接外部电路。
为了实现电池100的快速充电，电池100的电芯200在结构上通常采用极耳中置结构。极耳中置结构指的是第一极耳211和第二极耳221分别从靠近第一活性物质层212和第二活性物质层222的中间区域引出，从而优化电池100充放电过程中极片上电流密度的分布，降低电池100的内阻，实现电池100的快速充电。
然而，第一极耳211和第二极耳221分别焊接于第一活性物质层212和第二活 性物质层222而产生的焊点以及第一极耳211和第二极耳221自身存在的毛刺容易将隔膜刺破，从而导致第一极片210与第二极片220连接而发生短路，影响电池100的使用安全性。
基于申请人发现的上述问题，申请人对电芯200的结构进行改进，下面对本申请实施例进行进一步描述。
参见图5所示，本申请实施例的电芯200包括第一极片210、第二极片220、第一隔膜230和第一绝缘组件260。
第一极片210包括第一极耳211和第一活性物质层212。第一活性物质层212包括第一安装槽212a。沿第一极片210的厚度方向X，第一安装槽212a贯穿第一活性物质层212。第一极耳211的至少部分设置于第一安装槽212a内。需要说明的是，第一极耳211位于第一安装槽212a的部分为第一极耳连接部2111。
第一极片210包括第一活性物质层212和第一集流体213。第一集流体213的两个表面均设置有第一活性物质层212。第一安装槽212a设置于第一活性物质层212。第一集流体213外露于第一安装槽212a，从而与第一极耳连接部2111相连接。
第二极片220包括第二极耳221和第二活性物质层222。第二活性物质层222包括第二安装槽222a。沿厚度方向X，第二安装槽222a贯穿第二活性物质层222。第二极耳221的至少部分设置于第二安装槽222a内。需要说明的是，第二极耳221位于第一安装槽212a的部分为第二极耳连接部2211。
第二活性物质层222包括第二集流体223和。第二集流体223的两个表面均设置有第二活性物质层222。第二安装槽222a设置于第二活性物质层222。第二集流体223外露于第二安装槽222a，从而与第二极耳连接部2211相连接。
第一隔膜230设置于第一极片210和第二极片220之间，以使第一极片210和第二极片220绝缘隔离。
第一绝缘组件260设置于第一极片210和第二极片220之间。第一绝缘组件260包括第一绝缘片261和第二绝缘片262。第一绝缘片261设置于第二极片220靠近第一隔膜230的一侧表面上。沿厚度方向X，第一安装槽212a以及第二安装槽222a各自的正投影位于第一绝缘片261的正投影内。
第一绝缘片261可以有效避免第二安装槽222a内的第二极耳221自身的毛刺或者金属焊点刺破第一隔膜230，而与第一极片210的第一活性物质层212连接导致电芯200内部发生短路的现象，同时，也可以避免第一安装槽212a内的第一极耳211自身的毛刺或者金属焊点依次刺破第二绝缘片262和第一隔膜230，而与第 二极片220的第二活性物质层222连接导致电芯200内部发生短路的现象。
本申请实施例的第一绝缘片261可以为一体结构，并且第一安装槽212a以及第二安装槽222a各自的正投影均位于第一绝缘片261的正投影内。
现有技术中，参见图4所示，在第二极片220上与第二极耳221相对应的位置设置有第二极片绝缘层300。第二极片绝缘层300位于第二极片220与隔膜之间。在第一极片210上与第二极耳221相对应的位置设置有双重保护绝缘层400。双重保护绝缘层400位于隔膜与第二极片220之间。
第二极片绝缘层300和双重保护绝缘层400为分体结构。设置第二极片绝缘层300和双重保护绝缘层400后的电芯200，当第一极耳211与第二极耳221的中心距较小时，第二极片绝缘层300和双重保护绝缘层400在电芯200的卷绕工序中受到卷绕的挤压力后，沿厚度方向X，第二极片绝缘层300和双重保护绝缘层400的部分区域会产生相互重叠的现象，因此，电芯200在此重叠区域的厚度就会偏大，从而造成电芯200厚度整体的极差较大。需要说明的是，电芯200厚度整体的极差指的是电芯200厚度最大值与最小值的差值。
电芯200整体厚度极差较大会导致卷绕工序后的电芯200内部卷绕不紧密，从而使第一极片210、隔膜和第二极片220之间的间隙增大且一致性差，导致锂离子的运动路径较长，甚至由于间隙较大锂离子无法嵌入，最终在具有负极极性的极片的表面产生析锂现象。
电芯200整体厚度极差较大还会导致电芯200的平整度差，从而使电池100的不良率增高，影响电池100的交付。
因此，本申请实施例的第一绝缘片261在电芯200的卷绕工序中受到卷绕的挤压力后，第一绝缘片261不易出现重叠部分，有利于降低电芯200整体厚度极差较大导致的电芯平整度差、化成界面一致性差以及发生析锂现象的可能性。
在一些示例中，第一安装槽212a可以通过激光清洗或者刮片工艺将第一集流体213表面的部分第一活性物质层212去除的方式而形成。示例性地，第一安装槽212a的底壁清洗干净并露出第一集流体213，从而避免第一安装槽212a内残余的第一活性物质层212影响第一极耳连接部2111与第一集流体213之间的连接稳定性。第二安装槽222a可以通过激光清洗或者刮片工艺将第二集流体223表面的部分第二活性物质层222去除的方式而形成。示例性地，第二安装槽222a的底壁清洗干净并露出第二集流体223，从而避免第二安装槽222a内残余的第二活性物质层222影响第二极耳连接部2211与第二集流体223之间的连接稳定性。
在一些示例中，第一极耳连接部2111与第一集流体213的连接方式为焊接， 例如，激光焊接或超声波焊接。第二极耳连接部2211与第二集流体223的焊接过程中，焊接设备作用于第二极耳连接部2211背向第二集流体223的表面，将第二极耳连接部2211与第二集流体223焊接为一体，并在第二活性物质层222未设置有第二极耳连接部2211的第二安装槽222a内形成焊点。在电芯200的卷绕工序中，焊点容易刺穿第一隔膜230而与第一极片210连接，造成电芯200的短路。第一绝缘组件260覆盖于第二集流体223未设置有第二极耳连接部2211的一侧，可以有效避免出现第二极耳连接部2211与第二集流体223焊接后产生的焊点刺穿第一隔膜230而与第一活性物质层212连接造成电芯200短路的问题。
在一些可实现的方式中，参见图5和图6所示，第一活性物质层212包括两个第一安装槽212a。两个第一安装槽212a沿第一极片210的厚度方向相对设置。其中，第一极耳211位于远离第一绝缘片261的第一安装槽212a。
在一些可实现的方式中，第一绝缘组件260包括第二绝缘片262。第二绝缘片262设置于第一隔膜230和第一极片210之间并且与靠近第一绝缘片261的第一安装槽212a对应设置。
第一极耳连接部2111位于第一极片210远离第一隔膜230的第一安装槽212a内。第二绝缘片262覆盖外露于第一安装槽212a的第一集流体213，即第二绝缘片262覆盖第一极片210上未设置有第一极耳连接部2111的第一安装槽212a。第二绝缘片262可以有效避免第一安装槽212a内的金属焊点刺破第一隔膜230而使第一极耳211与第二极片220的第二活性物质层222连接发生短路连接导致电芯200内部发生短路的现象。
在一些可实现的方式中，参见图5和图6所示，沿厚度方向X，第二绝缘片262的正投影位于第一绝缘片261的正投影内。
在一些示例中，第一极片210具有负极极性。第二极片220具有正极极性。沿厚度方向X，若第二绝缘片262的正投影超出第一绝缘片261的正投影，会导致第一活性物质层212被第二绝缘片262覆盖的面积大于第一活性物质层212被第一绝缘片261覆盖的面积，从而导致包含正极活性物质的第二活性物质层222脱嵌出的锂离子无法嵌入到包含负极活性物质的第一活性物质层212，而在第一极片210上析出的析锂现象。因此，第二绝缘片262的正投影位于第一绝缘片261的正投影内可以避免析锂现象的发生。
在一些可实现的方式中，参见图5所示，第二活性物质层222包括两个第二安装槽222a。两个第二安装槽222a沿第二极片220的厚度方向X相对设置。其中，第二极耳221位于远离第二绝缘片262的第二安装槽222a。第一绝缘组件260还包 括第三绝缘片263。第三绝缘片263设置于第一隔膜230和第一极片210之间并且与靠近第一绝缘片261的第二安装槽222a对应设置。
第一绝缘片261和第三绝缘片263可以对第一极耳211进行双重保护，从而有利于避免第二极耳连接部2211自身的毛刺或者第二极耳连接部2211与第二集流体223焊接产生的焊点依次刺破第一绝缘片261和第一隔膜230而与第一活性物质层212相接触，导致电芯200内部发生短路的现象。
第二极耳连接部2211位于第二极片220远离第一隔膜230的第二安装槽222a内。第三绝缘片263覆盖外露于第二安装槽222a的第二集流体223，即第三绝缘片263覆盖第二极片220上未设置有第二极耳连接部2211的第二安装槽222a。第一绝缘片261和第三绝缘片263可以对第一极耳211进行双重保护，从而有利于避免第二极耳连接部2211自身的毛刺或者第二极耳连接部2211与第二集流体223焊接产生的焊点依次刺破第一绝缘片261和第一隔膜230，而与第一活性物质层212相接触导致电芯200内部发生短路的现象。
在一些可实现的方式中，沿第二活性物质层222的长度方向Y，第三绝缘片263的尺寸为第二安装槽222a的尺寸的0.5倍至1倍。
沿长度方向Y，第二绝缘片262可以覆盖第一安装槽212a的焊点。第二绝缘片262的尺寸可以大于第一安装槽212a尺寸，以使第二绝缘片262与第一极片210连接紧密，降低电芯200在卷绕工序中第二绝缘片262脱离，导致第二绝缘片262失效，第一安装槽212a内的金属焊点刺破第一隔膜230而使第一极耳211与第二极片220的第二活性物质层222连接发生短路的可能性。
在一些可实现的方式中，第二绝缘片262和第三绝缘片263为一体结构。一体结构可以避免电芯200在卷绕工序中，第二绝缘片262和第三绝缘片263受到卷绕的挤压力后发生重叠，从而占用电芯200在厚度方向X上的空间，导致电池100的能量密度降低。此外，一体结构的第二绝缘片262和第三绝缘片263可以减少绝缘片的种类以及数量，避免零件种类过多造成绝缘片贴错位置，从而影响电池100的加工效率。
在一些可实现的方式中，电芯还包括第二绝缘组件和第三绝缘组件。第二绝缘组件250设置于第二极片220背向第一安装槽212a的一侧。
在一些示例中，沿厚度方向X，第二安装槽222a的正投影位于第二绝缘组件250的正投影内。
示例性地，第二极耳连接部2211位于第二活性物质层222上远离第一隔膜230的第二安装槽222a内。第二绝缘组件250可以覆盖第二极耳连接部2211背离 第二集流体223的表面，从而避免第二极耳连接部2211自身的毛刺与相邻的第一极片210连接，导致电芯200的内部产生短路。
第三绝缘组件240设置于第一极片210背向第二安装槽222a的一侧。
在一些示例中，沿厚度方向X，第一安装槽212a的正投影位于第三绝缘组件240的正投影内。
示例性地，第一极耳连接部2111位于第一活性物质层212上远离第一隔膜230的第一安装槽212a内。第三绝缘组件240可以覆盖第一极耳连接部2111背离第一集流体213的表面，从而避免第一极耳连接部2111自身的毛刺与相邻的第二极片220的第二活性物质层222连接，导致电芯200的内部发生短路。
在一些可实现的方式中，参见图5所示，本申请实施例的电芯200还包括第二隔膜270。第二隔膜270、第一极片210、第一隔膜230和第二极片220依次叠放后卷绕从而形成电芯200。第二极片220和第一极片210各自背向第一隔膜230的一侧设置有第二隔膜270。第二绝缘组件250包括第四绝缘片251和第五绝缘片252。第四绝缘片251和第五绝缘片252之间设置有第二隔膜270。第四绝缘片251设置于第二隔膜270和第二极片220之间。
在一些示例中，第二绝缘组件250包括两层绝缘片，即第四绝缘片251和第五绝缘片252。第二极耳连接部2211位于第二活性物质层222远离第一隔膜230的第二安装槽222a内。第四绝缘片251覆盖第二极耳连接部2211背离第二集流体223的表面，从而避免第二极耳连接部2211自身的毛刺直接刺穿第二隔膜270而与远离第一隔膜230的第一极片210连接，导致电芯200的内部发生短路。
在一些可实现的方式中，参见图5所示，第五绝缘片252的正投影位于第四绝缘片251的正投影内。
在一些示例中，第一活性物质层212包含负极活性物质。第二活性物质层222包含负极活性物质。第四绝缘片251覆盖第二活性物质层222，而第五绝缘片252覆盖第一活性物质层212，因此第五绝缘片252覆盖第一活性物质层212的面积小于第四绝缘片251覆盖第二活性物质层222的面积，可以避免析锂现象的发生。
在一些可实现的方式中，参见图6所示，第一绝缘组件260还包括第三绝缘片263。第三绝缘片263设置于第一绝缘片261面向第二极片220的一侧并且与第二安装槽222a对应设置。
在一些示例中，沿厚度方向X，第三绝缘片263的正投影位于第一绝缘片261的正投影内。第三绝缘片263的正投影位于第二绝缘片262的正投影的外侧。
沿厚度方向X，第三绝缘片263的正投影位于第二绝缘片262的正投影的外侧， 以避免第二绝缘片262和第三绝缘片263之间相互重叠，导致电芯200的厚度较大，从而造成电芯200厚度整体的极差较大，影响电池100的一致性。
在一些示例中，第三绝缘片263覆盖第二集流体223外露于第二安装槽222a的区域。由于设置有第三绝缘片263，第二极耳连接部2211与第二集流体223焊接产生的焊点需依次刺穿第三绝缘片263、第一绝缘片261以及第一隔膜230才会与第一活性物质层212发生接触，因此第一绝缘片261和第三绝缘片263可以形成双重保护，有利于避免电芯200发生短路。
在一些示例中，第一极片210具有负极极性。第二极片220具有正极极性。第三绝缘片263的正投影和第二绝缘片262的正投影均位于第一绝缘片261的正投影的内部。由于第一绝缘片261覆盖包含正极活性物质的第二活性物质层222，而第二绝缘片262和第三绝缘片263均覆盖包含负极活性物质的第一活性物质层212，因此第三绝缘片263的正投影和第二绝缘片262的正投影均位于第一绝缘片261的正投影的内部，以避免第一活性物质层212被第二绝缘片262和第三绝缘片263覆盖后的面积小于第二活性物质层222被第一绝缘片261覆盖后的面积，从而导致由第二活性物质层222脱嵌出的锂离子无法嵌入到第一活性物质层212而在第一极片210上产生析出的析锂现象。
在一些示例中，第二绝缘片262的尺寸可以小于或者等于第一安装槽212a，以使沿厚度方向X，第二绝缘片262完全位于第一安装槽212a的内部。第二绝缘片262的厚度不会占用电芯200在厚度方向X上的空间。在电芯200体积一定的条件下，可以使电芯200内部卷绕的更加紧密，从而有利于提高电池100的能量密度。
在一些可实现的方式中，参见图6所示，电芯200还包括第二隔膜270。第二极片220和第一极片210各自背向第一隔膜230的一侧设置有第二隔膜270。第二绝缘组件250包括第四绝缘片251和第五绝缘片252。第四绝缘片251和第五绝缘片252均位于第二极片220和第二隔膜270之间，第四绝缘片251设置于第五绝缘片252和第二极片220之间。
在一些示例中，第二极耳连接部2211位于第二活性物质层222面向第二隔膜270的第二安装槽222a内。第四绝缘片251的作用为避免第二极耳221自身的毛刺刺破第二隔膜270而与远离第一隔膜230的第一活性物质层212相接触而产生短路。第四绝缘片251和第五绝缘片252可以对第二极耳连接部2211进行双重保护。
沿厚度方向X，第四绝缘片251的正投影可以位于第二安装槽222a的正投影的内部，因此，第四绝缘片251沿第二活性物质层222的长度方向Y的尺寸可以设 置的较小。此外，沿长度方向Y，由于第五绝缘片252超出第四绝缘片251即可，因此，第五绝缘片252沿长度方向Y的尺寸也可以设置的较小，以使第四绝缘片251和第五绝缘片252作用于第二极片220上的面积尽可能小，从而使第四绝缘片251和第五绝缘片252覆盖第二活性物质层222的面积小。当第二活性物质层222包含正极活性物质时，可以有效提高电芯200的能量密度。
在一些可实现的实施方式中，参见图6所示，沿厚度方向X，第四绝缘片251的正投影位于第五绝缘片252的正投影内。
在一些示例中，第四绝缘片251覆盖第二极耳连接部2211。沿厚度方向X，第四绝缘片251可以位于第二安装槽222a的内部，以使第四绝缘片251的厚度不会占用电芯200在厚度方向X上的空间。在电芯200体积一定的条件下，可以使电芯200内部卷绕的更加紧密，从而有利于提高电池100的能量密度。
在一些可实现的方式中，沿第二活性物质层222的长度方向Y，第四绝缘片251的尺寸为第二安装槽222a的尺寸的0.5倍至1.5倍。
沿长度方向Y，第四绝缘片251可以覆盖第二极耳221。第四绝缘片251的尺寸小于或者等于第二安装槽222a，以使沿厚度方向X，第四绝缘片251完全位于第二安装槽222a的内部。第四绝缘片251的厚度不会占用电芯200在厚度方向X上的空间。在电芯200体积一定的条件下，可以使电芯200内部卷绕的更加紧密，从而有利于提高电池100的能量密度。
在一些可实现的方式中，沿第二活性物质层222的长度方向Y，第五绝缘片252的尺寸超出第二安装槽222a的尺寸的取值范围的1mm至15mm。
沿长度方向Y，第五绝缘片252面向第二活性物质层222的表面的两侧可以与第二活性物质层222连接紧密，从而在电芯200的卷绕工艺中，可以降低第五绝缘片252受到第二极耳221自身毛刺的作用力，第五绝缘片252由第二活性物质层222上脱离下来，导致电芯200的平整度差、电池100的不良率增高的可能性。
在一些可实现的方式中，参见图5和图6所示，本申请实施例的电芯200还包括第二隔膜270。第二极片220和第一极片210各自背向第一隔膜230的一侧设置有第二隔膜270。第三绝缘组件240包括第六绝缘片241和第七绝缘片242。第六绝缘片241和第七绝缘片242之间设置有第二隔膜270。第六绝缘片241设置于第二隔膜270和第一极片210之间。
第三绝缘组件240包括两层绝缘片，即第六绝缘片241和第七绝缘片242。第一极耳连接部2111位于第一活性物质层212远离第一隔膜230的第一安装槽212a内。第六绝缘片241覆盖第一极耳连接部2111背向第一集流体213的表面，从而 避免第一极耳连接部2111自身的毛刺刺穿第二隔膜270而与远离第一隔膜230的第二极片220连接，导致电芯200的内部产生短路。
在一些可实现的方式中，参见图5和图6所示，沿厚度方向X，第六绝缘片241的正投影位于第七绝缘片242的正投影内。
在一些示例中，第一活性物质层212包含负极活性物质。第二活性物质层222包含正极活性物质。第六绝缘片241覆盖第二活性物质层222，而第七绝缘片242覆盖第一活性物质层212，因此第六绝缘片241覆盖第一活性物质层212的面积小于第七绝缘片242覆盖第二活性物质层222的面积，可以避免析锂现象的发生。
在一些可实现的方式中，第一极耳211和第二极耳221位于电芯200的中心轴线M的同一侧。第一极耳211和第二极耳221位于电芯200的同一折上。
在一些示例中，参见图3所示，第一极耳211和第二极耳221均设置于分界线N的下方；或者，第一极耳211和第二极耳221均设置于分界线N的上方。
示例性地，沿厚度方向X，分界线N的下方依次为第二隔膜270、第一极片210、第一隔膜230和第二极片220，并依次类推。第一极耳211和第二极耳221可以设置于分界线N的下方。并且，第一极耳211和第二极耳221分别设置于中间为第一隔膜230的第一极片210和第二极片220上。
在一些示例中，参见图5和图6所示，本申请实施例的第一极耳211的一部分设置于远离第一隔膜230的第一安装槽212a内，即第一极耳连接部2111可以设置于远离第一隔膜230的第一安装槽212a内。第二极耳221的一部分设置于远离第一隔膜230的第二安装槽222a内。即第二极耳连接部2211可以设置于远离第一隔膜230的第二安装槽222a内。
在本申请实施例的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应作广义理解，例如，可以是固定连接，也可以是通过中间媒介间接相连，可以是两个元件内部的连通或者两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
在本申请实施例或者暗示所指的装置或者元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。在本申请实施例的描述中，“多个”的含义是两个或两个以上，除非是另有精确具体地规定。
本申请实施例的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互 换，以便这里描述的本申请实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。
此外，术语“包括”和“具有”以及他们的任何变形，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、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本文中的术语“多个”是指两个或两个以上。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系；在公式中，字符“/”，表示前后关联对象是一种“相除”的关系。
可以理解的是，在本申请的实施例中涉及的各种数字编号仅为描述方便进行的区分，并不用来限制本申请的实施例的范围。
可以理解的是，在本申请的实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请的实施例的实施过程构成任何限定。

Claims (20)

  1. 一种电芯，其特征在于，包括：
    第一极片，包括第一极耳和第一活性物质层，所述第一活性物质层包括第一安装槽，所述第一极耳的至少部分设置于所述第一安装槽内；
    第二极片，包括第二极耳和第二活性物质层，所述第二活性物质层包括第二安装槽，所述第二极耳的至少部分设置于所述第二安装槽内；
    第一隔膜，设置于所述第一极片和所述第二极片之间；
    第一绝缘组件，设置于所述第一极片和所述第二极片之间，所述第一绝缘组件包括第一绝缘片，所述第一绝缘片设置于第二极片靠近所述第一隔膜的一侧表面上，沿所述第一极片的厚度方向，所述第一安装槽以及所述第二安装槽各自的正投影位于所述第一绝缘片的正投影内。
  2. 根据权利要求1所述的电芯，其特征在于，所述第一活性物质层包括两个所述第一安装槽，两个所述第一安装槽沿所述厚度方向相对设置，其中，所述第一极耳位于远离所述第一绝缘片的所述第一安装槽。
  3. 根据权利要求1所述的电芯，其特征在于，所述第一绝缘组件包括第二绝缘片，所述第二绝缘片设置于所述第一隔膜和所述第一极片之间；
    所述第二绝缘片与靠近所述第一绝缘片的所述第一安装槽对应设置。
  4. 根据权利要求3所述的电芯，其特征在于，沿所述厚度方向，所述第二绝缘片的正投影位于所述第一绝缘片的正投影内。
  5. 根据权利要求3所述的电芯，其特征在于，所述第二活性物质层包括两个所述第二安装槽，两个所述第二安装槽沿所述第二极片的厚度方向相对设置，其中，所述第二极耳位于远离所述第一绝缘片的所述第二安装槽。
  6. 根据权利要求5所述的电芯，其特征在于，所述第一绝缘组件还包括第三绝缘片，所述第三绝缘片设置于所述第一隔膜和所述第一极片之间；
    所述第三绝缘片靠近所述第二绝缘片的所述第二安装槽。
  7. 根据权利要求6所述的电芯，其特征在于，沿所述第二活性物质层的长度方向，所述第三绝缘片的尺寸为所述第二安装槽的尺寸的0.5倍至1倍。
  8. 根据权利要求6所述的电芯，其特征在于，所述第二绝缘片和所述第三绝缘片为一体结构。
  9. 根据权利要求1所述的电芯，其特征在于，所述电芯还包括第二绝缘组 件和第三绝缘组件；
    第二绝缘组件设置于所述第二极片背向所述第一安装槽的一侧；
    第三绝缘组件设置于所述第一极片背向所述第二安装槽的一侧。
  10. 根据权利要求9所述的电芯，其特征在于，所述电芯还包括第二隔膜，所述第一极片和所述第二极片各自背向所述第一隔膜的一侧设置有所述第二隔膜，所述第二绝缘组件包括第四绝缘片和第五绝缘片，所述第四绝缘片和所述第五绝缘片之间设置有所述第二隔膜，所述第四绝缘片设置于所述第二隔膜和所述第二极片之间。
  11. 根据权利要求10所述的电芯，其特征在于，沿所述厚度方向，所述第五绝缘片的正投影位于所述第四绝缘片的正投影内。
  12. 根据权利要求3所述的电芯，其特征在于，所述第二活性物质层包括两个所述第二安装槽，两个所述第二安装槽沿所述第二极片的厚度方向相对设置，其中，所述第二极耳位于远离所述第二绝缘片的所述第二安装槽，所述第一绝缘组件还包括第三绝缘片，所述第三绝缘片设置于所述第一绝缘片面向所述第二极片的一侧并且与靠近所述第二绝缘片的所述第二安装槽对应设置，沿所述厚度方向，所述第三绝缘片的正投影位于所述第二安装槽的正投影内。
  13. 根据权利要求10所述的电芯，其特征在于，所述电芯还包括第二隔膜，所述第一极片和所述第二极片各自背向所述第一隔膜的一侧设置有所述第二隔膜，所述第二绝缘组件包括第四绝缘片和第五绝缘片，所述第四绝缘片和所述第五绝缘片均位于所述第二极片和所述第二隔膜之间，所述第四绝缘片设置于所述第五绝缘片和所述第二极片之间。
  14. 根据权利要求13所述的电芯，其特征在于，沿所述厚度方向，所述第四绝缘片的正投影位于所述第五绝缘片的正投影内。
  15. 根据权利要求13所述的电芯，其特征在于，沿所述第二活性物质层的长度方向，所述第四绝缘片的尺寸为所述第二安装槽的尺寸的0.5倍至1倍。
  16. 根据权利要求14所述的电芯，其特征在于，沿所述第二活性物质层的长度方向，所述第五绝缘片的尺寸超出所述第二安装槽的尺寸的取值范围1mm至15mm。
  17. 根据权利要求9所述的电芯，其特征在于，所述电芯还包括第二隔膜，所述第一极片和所述第二极片各自背向所述第一隔膜的一侧设置有所述第二 隔膜，所述第三绝缘组件包括第六绝缘片和第七绝缘片，所述第六绝缘片和所述第七绝缘片之间设置有所述第二隔膜，所述第六绝缘片设置于所述第二隔膜和所述第一极片之间。
  18. 根据权利要求17所述的电芯，其特征在于，沿所述厚度方向，所述第六绝缘片的正投影位于所述第七绝缘片的正投影内。
  19. 根据权利要求1所述的电芯，其特征在于，沿所述厚度方向，所述第一极耳和所述第二极耳位于所述电芯的中心轴线的同一侧，所述第一极耳和所述第二极耳位于所述电芯的同一折上。
  20. 一种电池，其特征在于，包括如权利要求1至19任一项所述的电芯。
PCT/CN2023/070643 2022-03-31 2023-01-05 电芯以及电池 Ceased WO2023185191A1 (zh)

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