WO2021109363A1 - 电极组件及其成型方法和生产系统、二次电池、电池模块以及装置 - Google Patents

电极组件及其成型方法和生产系统、二次电池、电池模块以及装置 Download PDF

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Publication number
WO2021109363A1
WO2021109363A1 PCT/CN2020/081139 CN2020081139W WO2021109363A1 WO 2021109363 A1 WO2021109363 A1 WO 2021109363A1 CN 2020081139 W CN2020081139 W CN 2020081139W WO 2021109363 A1 WO2021109363 A1 WO 2021109363A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
electrode assembly
sections
bending
bending section
Prior art date
Application number
PCT/CN2020/081139
Other languages
English (en)
French (fr)
Inventor
赵丰刚
吴志阳
廖如虎
曾钢
戴亚
虞永生
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP20896510.3A priority Critical patent/EP3907807B1/en
Priority to KR1020227018609A priority patent/KR20220093183A/ko
Priority to CN202080005889.6A priority patent/CN113302777B/zh
Priority to JP2022532140A priority patent/JP7416942B2/ja
Publication of WO2021109363A1 publication Critical patent/WO2021109363A1/zh
Priority to US17/489,666 priority patent/US20220021016A1/en
Priority to JP2024000179A priority patent/JP2024041838A/ja

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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/045—Cells or batteries with folded plate-like electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/045—Cells or batteries with folded plate-like electrodes
    • H01M10/0454—Cells or batteries with electrodes of only one polarity folded
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling 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
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • H01M4/74—Meshes or woven material; Expanded metal
    • H01M4/742—Meshes or woven material; Expanded metal perforated material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/005—Devices for making primary cells
    • 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, in particular to an electrode assembly and its forming method and production system, secondary battery, battery module and device.
  • the secondary battery forms a battery module by connecting a plurality of battery cells in series or in parallel to achieve a larger capacity or power.
  • the secondary battery includes a cathode sheet and an anode sheet, and the cathode sheet and the anode sheet are stacked to form an electrode assembly.
  • the cathode sheet and the anode sheet are stacked on each other, at least one of the cathode sheet and the anode sheet may deviate from a predetermined position, thereby affecting the electrochemical performance of the secondary battery.
  • the embodiments of the present application provide an electrode assembly and its forming method and production system, secondary battery, battery module and device, which can ensure that the first pole piece and the second pole piece are in a predetermined position after being laminated, thereby ensuring that the secondary battery has Good electrochemical performance.
  • an electrode assembly for a secondary battery which includes:
  • the first pole piece includes a plurality of bending sections and a plurality of stacked first stacking sections, each bending section is used to connect two adjacent first stacking sections, wherein the bending section has a guide part, To guide the bending of the bending section during production; the second pole piece with the opposite polarity to the first pole piece, the second pole piece includes a plurality of second stacking sections, and each second stacking section is arranged on two adjacent first pole pieces. Between a stack of sections.
  • a secondary battery which includes the electrode assembly as in the above-mentioned embodiment.
  • a battery module which includes the secondary battery as in the above-mentioned embodiment.
  • a device which includes the secondary battery as in the above-mentioned embodiment, and the secondary battery provides electrical energy.
  • a method for forming an electrode assembly which includes:
  • a first pole piece is provided, the first pole piece includes a plurality of bending sections and a plurality of first stacking sections, each bending section is used to connect two adjacent first stacking sections, wherein the bending section has a guiding part ;
  • the second pole piece includes a plurality of second stacking sections, and each second stacking section is arranged between two adjacent first stacking sections;
  • the bending section is bent along the guide portion, so that two adjacent first stacking sections connected to the bending section are stacked.
  • an electrode assembly production system is provided according to an embodiment of the present application, which includes:
  • the first conveying mechanism provides a first pole piece, the first pole piece includes a plurality of bending sections and a plurality of stacked first stacking sections, each bending section is used to connect two adjacent first stacking sections;
  • the marking mechanism is used to set a guide on the bending section, and the guiding section is used to guide the bending of the bending section during production;
  • the second conveying mechanism provides a second pole piece with the opposite polarity to the first pole piece, the second pole piece includes a plurality of second stacking sections, and each second stacking section is arranged between two adjacent first stacking sections ;
  • the sheet lamination mechanism is used to bend the bending section along the guide portion, and to stack two adjacent first stacking sections connected to the bending section.
  • the beneficial effects of the present application are as follows: by arranging the guiding part in the bending section, the bending section can be bent along the guiding part during production, which ensures that the bending position of the bending section is more accurate relative to the first stacking section.
  • the first pole piece and the second pole piece are stacked in a predetermined position, thereby ensuring that the secondary battery has good electrochemical performance.
  • Fig. 1 is a schematic structural diagram of a vehicle disclosed in an embodiment of the present application
  • FIG. 2 is a schematic diagram of an exploded structure of a battery pack disclosed in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a partial structure of a battery module disclosed in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an exploded structure of a secondary battery disclosed in an embodiment of the present application.
  • FIG. 5 is a schematic partial top view of the first pole piece before bending according to an embodiment of the present application.
  • FIG. 6 is a schematic side view of the structure of the first pole piece of the embodiment shown in FIG. 5;
  • FIG. 7 is a schematic structural view of the first pole piece in the bent state of the embodiment shown in FIG. 5;
  • FIG. 8 is a schematic diagram of the connection structure of the first pole piece, the second pole piece and the isolation membrane of the embodiment shown in FIG. 5;
  • FIG. 9 is a schematic side view of the structure of an electrode assembly according to an embodiment of the present application.
  • FIG. 10 is a top view of the first structure diagram of the electrode assembly of the embodiment shown in FIG. 9;
  • FIG. 11 is a top view of the second structure diagram of the electrode assembly of the embodiment shown in FIG. 9;
  • FIG. 12 is a schematic side view of the structure of an electrode assembly according to another embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a bent state of the first pole piece according to another embodiment of the present application.
  • FIG. 14 is a schematic side view of the structure of the electrode assembly including the first pole piece of the embodiment shown in FIG. 13;
  • 15 is a schematic structural diagram of a bent state of the first pole piece according to another embodiment of the present application.
  • 16 is a schematic structural diagram of the first pole piece in a bent state according to another embodiment of the present application.
  • FIG. 17 is a schematic cross-sectional view of the side view of the electrode assembly including the first pole piece of the embodiment shown in FIG. 16;
  • FIG. 18 is a schematic structural diagram of a first pole piece in a bent state according to another embodiment of the present application.
  • FIG. 19 is a schematic side view of the structure of an electrode assembly according to another embodiment of the present application.
  • 20 is a schematic side view of the structure of an electrode assembly according to another embodiment of the present application.
  • 21 is a schematic structural diagram of a laminated battery cell production system according to an embodiment of the present application.
  • Figure 22 is a schematic structural diagram of a first conveying mechanism according to an embodiment of the present application.
  • FIG. 23 is a schematic diagram of the structure of the anode sheet and the trace-making mechanism of the embodiment of the present application.
  • FIG. 24 is a schematic diagram of an anode sheet with traces according to an embodiment of the present application.
  • Figure 25 is a schematic structural diagram of a second conveying mechanism according to an embodiment of the present application.
  • FIG. 26 is a schematic structural diagram of a composite mechanism of an embodiment of the present application.
  • FIG. 27 is a schematic diagram of the structure of the heating transmission assembly of the embodiment of the present application.
  • Figure 28 is a top view of the structure shown in Figure 27;
  • 29 is a schematic diagram of the structure of the lamination mechanism of the embodiment of the present application.
  • Figure 30 is a bottom view of the structure shown in Figure 29;
  • FIG. 31 is a schematic diagram of the cooperation of the lamination mechanism with the main conveying mechanism and the group of laminations according to an embodiment of the present application.
  • Electrode assembly 50a, body part; 50b, tab;
  • W Extension direction
  • H thickness direction
  • X first direction
  • Y second direction
  • Z bending direction
  • the first conveying mechanism 101.
  • the first unwinding device 102.
  • the first belt connecting device 103.
  • the first tension balance device 104.
  • the first correction device 105.
  • the first dust removal device 106.
  • the second conveying mechanism 401.
  • the second unwinding device 402.
  • the second belt connecting device 403.
  • the second tension balance device 403.
  • the second correction device 405.
  • the cutting device 406.
  • the second dust removal device. 4061, belt brush; 4062, dust collection device;
  • 500 Composite mechanism; 501. Heating transmission component; 5011, heating component; 5012, conveying component; 5012a, transmission wheel; 5012b, transmission belt; 502, rolling component; 5021, squeezing roller; 503, dust removal component;
  • 600 laminated mechanism; 601, power source; 602, swing mechanism; 6021, gap; 6022, mounting seat; 6023, clamping roller; 6024, limit reinforcement roller;
  • the main conveying mechanism 700.
  • the embodiment of the present application provides a device that uses the secondary battery 30 as a power source.
  • the device can be, but is not limited to, a vehicle, a ship, or an aircraft.
  • an embodiment of the present application provides a vehicle 1 including a vehicle body and a battery module.
  • the battery module is installed in the vehicle body.
  • the vehicle 1 may be a pure electric vehicle, a hybrid electric vehicle or an extended-range vehicle.
  • the vehicle body is provided with a drive motor electrically connected to the battery module.
  • the battery module provides power to the drive motor.
  • the drive motor is connected to the wheels on the vehicle body through a transmission mechanism to drive the vehicle to travel.
  • the battery module may be horizontally arranged at the bottom of the vehicle body.
  • the battery module may be a battery pack 10.
  • the battery pack 10 includes a box body and a battery module 20 disposed in the box body.
  • the number of battery modules 20 is one or more.
  • One or more battery modules 20 are arranged side by side in the box.
  • the type of cabinet is not limited.
  • the box can be a frame-shaped box, a disk-shaped box, or a box-shaped box.
  • the box body includes a lower box body for accommodating the battery module 20 and an upper box body covered with the lower box body.
  • the upper box body and the lower box body are closed to form a receiving portion for accommodating the battery module 20.
  • the battery module may also be the battery module 20, that is, the battery module 20 is directly arranged on the vehicle body.
  • the battery module 20 includes a plurality of secondary batteries 30.
  • the battery module 20 includes an accommodating part and a plurality of secondary batteries 30 located in the accommodating part.
  • a plurality of secondary batteries 30 are arranged side by side in the accommodating part.
  • the accommodating part includes a shell and a cover plate covering the housing; or, the accommodating part includes side plates and end plates that are successively enclosed and connected; or, the accommodating part includes two oppositely arranged ends Plates and bands surrounding the end plates and the secondary battery 30.
  • the cathode sheet and the anode sheet in the formed electrode assembly deviated from the predetermined position, thus affecting the existence of the secondary battery. Electrochemical performance.
  • the applicant further discovered that at least one of the cathode sheet and the anode sheet in the formed electrode assembly deviated from a predetermined position, resulting in the phenomenon of lithium evolution in the electrode assembly, thereby affecting the electrochemical performance of the secondary battery. It is inferred that the reason may be that the size of the part of the anode sheet beyond the outer edge of the cathode sheet is too small or the anode sheet does not exceed the outer edge of the cathode sheet.
  • the applicant further studied the phenomenon of lithium evolution and found that taking the anode sheet as a continuous arrangement and the cathode sheet as an intermittent arrangement as an example, it is difficult for the anode sheet to be folded along the predetermined area during the bending process. Bending, after the cathode sheet and the anode sheet are stacked to form the electrode assembly, the size of the part of the anode sheet beyond the outer edge of the cathode sheet is too small, which easily leads to the phenomenon of lithium evolution in the electrode assembly, thereby affecting the electrochemical performance of the secondary battery And safety performance.
  • the secondary battery 30 of the embodiment of the present application includes a casing 40, an electrode assembly 50 provided in the casing 40, and a top cover assembly 60 sealedly connected to the casing 40.
  • the housing 40 in the embodiment of the present application has a square structure or other shapes.
  • the case 40 has an internal space accommodating the electrode assembly 50 and the electrolyte, and an opening communicating with the internal space.
  • the housing 40 may be made of materials such as aluminum, aluminum alloy, or plastic.
  • the top cover assembly 60 of the embodiment of the present application includes a top cover plate 61 and electrode terminals 62.
  • the top cover 61 of the embodiment of the present application has opposite outer and inner surfaces, and electrode extraction holes penetrating the outer and inner surfaces.
  • the top cover 61 can cover and close the opening of the housing 40 and is connected to the housing 40 in a sealed manner.
  • the inner surface of the top cover plate 61 faces the electrode assembly 50.
  • the electrode terminal 62 is arranged on the top cover plate 61 and arranged corresponding to the electrode lead-out hole. A part of the electrode terminal 62 is exposed on the outer surface of the top cover plate 61 and is used for welding with the bus bar.
  • the electrode assembly 50 of the embodiment of the present application includes a main body 50a and tabs 50b extending from the main body 50a.
  • two opposite end surfaces of the main body 50a each extend with a tab 50b.
  • one of the two opposite end surfaces of the main body portion 50a extends two tabs 50b.
  • the polarities of the two tabs 50b are opposite, one is the cathode tab and the other is the anode tab.
  • the cathode sheet active material is coated on the coating area of the cathode sheet, and the anode sheet active material is coated on the coating area of the anode sheet.
  • a plurality of uncoated regions extending from the coated region of the main body portion 50a are stacked as tabs 50b.
  • the cathode lug extends from the coating area of the cathode sheet, and the anode lug extends from the coating area of the anode sheet.
  • the adapter sheet 70 is used to connect the tab 50 b of the electrode assembly 50 and the electrode terminal 62.
  • FIG. 5 schematically shows a partial structure of the first pole piece 51 in an unfolded state.
  • the first pole piece 51 includes a plurality of bending sections 511 and a plurality of first stacking sections 512, wherein the bending section 511 is at least partially in a bent state after being bent.
  • the first pole piece 51 is a continuous extension structure as a whole.
  • the bending section 511 and the first stacking section 512 are alternately arranged.
  • Each bending section 511 connects two adjacent first lamination sections 512.
  • each first laminated section 512 has two opposite first outer edges 5121, and each bent section 511 has two opposite second outer edges 5112.
  • the first direction X is the same as the width direction of the first pole piece 51.
  • the first direction X is perpendicular to the extension direction W. In this embodiment, along the first direction X, the first outer edge 5121 and the second outer edge 5112 on the same side are flush.
  • the first pole piece 51 also has a tab 50b extending beyond the first outer edge 5121 of the first stack section 512 along the first direction X. The number and positions of the tabs 50b are set in one-to-one correspondence with the number and positions of the first stacking section 512.
  • the first pole piece 51 has a guide portion 5111 provided in the bending section 511. The number of the guide parts 5111 may be the same as the number of the bending sections 511.
  • the guiding part 5111 is used to guide the bending section 511 to bend during production.
  • the bending section 511 is easier to bend in the area where the guide portion 5111 is located. It is beneficial to improve the controllability and accuracy of the bending position, thereby ensuring that the first pole piece 51 and the second pole piece 52 are respectively at a predetermined position, so as to ensure that the secondary battery 30 has good electrochemical performance.
  • FIG. 6 schematically shows the side view structure of the first pole piece 51 of the embodiment shown in FIG. 5.
  • the first pole piece 51 includes a current collector 51a and an electrode active material layer 51b coated on the current collector 51a.
  • the current collector 51a has two surfaces opposed to each other in the thickness direction H of the first pole piece 51. Two electrode active material layers 51b are respectively provided on both surfaces.
  • the material of the current collector 51a is a metal material such as aluminum or aluminum alloy.
  • the material of the current collector 51a is a metal material such as copper or copper alloy.
  • the guide 5111 can leave traces for things.
  • it may refer to the removal of a part of the electrode active material layer 51b on the first pole piece 51 by a material removing member, or the removal of a part of the electrode active material layer 51b and a part of the current collector 51a on the first pole piece 51.
  • a guide part 5111 is provided on each bending section 511.
  • the guide portion 5111 includes a groove 5111a.
  • the groove 5111a is recessed and extends from the surface of the first pole piece 51 in the thickness direction H of the first pole piece 51 toward the direction close to the current collector 51a.
  • the groove 5111a provided in one bending section 511 is located on one side of the current collector 51a, and the groove 5111a provided in the other bending section 511 is located on the other side of the current collector 51a.
  • the groove 5111a may be formed by removing part of the electrode active material layer 51b on the first pole piece 51.
  • the depth of the groove 5111a may be equal to the thickness of the electrode active material layer 51b.
  • the groove 5111a extends to the surface of the current collector 51a, but does not extend into the current collector 51a.
  • the depth of the groove 5111a may also be smaller than the thickness of the electrode active material layer 51b, so that the groove 5111a does not penetrate the electrode active material layer 51b in the thickness direction H.
  • the groove 5111a and the current collector 51a There is also a part of electrode active material in the room.
  • the current collector 51a since the depth of the groove 5111a is less than or equal to the thickness of the electrode active material layer 51b, the current collector 51a will not be damaged when the groove 5111a is formed, and the depth of the groove 5111a is greater than that of the electrode active material layer 51b. In the case of thickness (at this time, the current collector 51a will be damaged), the strength of the current collector 51a will not be affected.
  • the mouth of the groove 5111a is greater than or equal to the bottom of the groove 5111a.
  • the projection of the groove 5111a on a plane perpendicular to the first direction X is V-shaped.
  • the projection of the groove 5111a is not limited to a V shape, and may also be a U shape or a rectangular shape. Since the mouth of the groove 5111a is greater than or equal to the bottom of the groove 5111a, on the one hand, it is beneficial to ensure the bending position of the bending section 511, and the groove 5111a is easy to form; on the other hand, during the bending process, the concave The electrode active material near the mouth of the groove 5111a receives little or no compressive stress, so that the bending resistance of the first laminated section 512 is reduced, and it is easier to bend to a predetermined position more accurately. .
  • the first pole piece 51 further has a weakened area 5110 arranged in the bending section 511, and the weakened area 5110 is arranged corresponding to the groove 5111a along the thickness direction H of the first pole piece 51.
  • the thickness of the first pole piece 51 in the weakened area 5110 is smaller than the thickness of the first pole piece 51 except for the weakened area 5110.
  • the bending section 511 is easier to bend in the weakened area 5110, which is beneficial to the two adjacent first laminated sections
  • the first outer edges 5121 of 512 on the same side are the same.
  • the thickness of the weakened area 5110 shows an increasing trend from the central area to the two side areas.
  • the groove 5111a extends to two opposite second outer edges 5112 of the bending section 511 to penetrate the entire bending section 511. Compared with the situation where the groove 5111a does not penetrate the entire bending section 511, During the bending process, the electrode active material near the groove 5111a receives less or no compression stress, so that the bending resistance of the first laminated section 512 is reduced, so that the bending can be better ensured.
  • the bending section 511 has a part of the electrode active material layer 51b.
  • the part of the two electrode active material layers 51b corresponding to the weakened area 5110 is not completely removed, and the other layer may or may not be completely removed.
  • the opening size of the groove 5111a is smaller than the size of the bending section 511, so that the other area of the bending section 511 except the guide portion 5111 is covered by the electrode active material.
  • Layer 51b covers. In one example, the portions corresponding to the two electrode active material layers 51b and the weakened area 5110 are completely removed.
  • the size of the guide portion 5111 in the first direction X is set according to the size of the bending section 511 in the first direction X.
  • the dimension of the guide part 5111 in the first direction X is the length of the guide part 5111.
  • the size of the bending section 511 in the first direction X is also the length of the bending section 511. Therefore, in some other embodiments, the groove 5111a does not penetrate the bending section 511 along the first direction X.
  • the ratio of the size of the groove 5111a in the first direction X to the size of the bending section 511 in the first direction X is 0.4 to 0.8, preferably 0.4, 0.5, 0.6, 0.7 or 0.8.
  • FIG. 7 schematically shows the structure of the first pole piece 51 of the embodiment shown in FIG. 5 in a multiple reciprocating folding state.
  • the first pole piece 51 needs to be bent.
  • the guide portion 5111 can guide the bending section 511 to bend, that is, the bending section 511 can be bent along the guide portion 5111, so that the bending position can be located at a predetermined position, which is beneficial to ensure adjacent
  • the first outer edges 5121 of the two first stacked sections 512 are the same.
  • the bending section 511 of the first pole piece 51 is bent along the bending direction Z shown in FIG. 7.
  • the bending direction Z and the first direction X are perpendicular to each other, that is, the plane of the bending direction Z and the first direction X are perpendicular to each other.
  • the first pole piece 51 can be bent reciprocally in a substantially zigzag shape.
  • the dashed line shown in FIG. 7 does not indicate a physical structure, but schematically shows a separation line between the bending section 511 and the first laminated section 512.
  • the two adjacent grooves 5111a are located on the two opposite surfaces of the first pole piece 51, and the grooves 5111a are located on the side that bears the compressive stress when the bending section 511 is bent, after the first pole piece 51 is folded,
  • the opening of the groove 5111a on the bending section 511 faces the space formed between two adjacent first lamination sections 512, that is, the groove 5111a is located on the inner surface of the bending section 511, so that the weakened area 5110 is close to the groove 5111a.
  • One side does not bear tensile stress, which reduces the possibility of fracture of the weak area 5110 under tensile stress.
  • the bent section 511 after bending has an arc shape, for example, it may be a circular arc shape.
  • isolation films 53 are respectively provided on opposite sides of the first pole piece 51.
  • the two isolation films 53 are arranged in a pair, and the first pole piece 51 is arranged between the two isolation films 53.
  • the isolation film 53 covers the first laminated section 512 and the bending section 511.
  • a second pole piece 52 is provided on the side of the isolation membrane 53 away from the first pole piece 51.
  • the polarities of the first pole piece 51 and the second pole piece 52 are opposite, and when one of them is a cathode piece, the other is an anode piece.
  • the second pole piece 52 includes a plurality of second stacked sections 521.
  • two adjacent second lamination sections 521 are respectively disposed on opposite sides of the first pole piece 51.
  • the first stacking section 512 and the second stacking section 521 are positioned corresponding to each other.
  • a second stacking section 521 is provided between two adjacent bending sections 511.
  • the present application does not limit the provision of a second stacking section 521 between two adjacent bending sections 511, and a matching number of second stacking sections 521 can also be provided according to product requirements.
  • the second laminated section 521 is attached to the isolation film 53.
  • the second laminated section 521 and the isolation film 53 may be connected by hot pressing, electrophoresis, or bonding.
  • the isolation film 53 is an insulator interposed between the first pole piece 51 and the second pole piece 52.
  • the material of the isolation film 53 may be an insulating material such as plastic to insulate and isolate the first pole piece 51 and the second pole piece 52.
  • FIG. 9 schematically shows a side view structure of an electrode assembly 50 according to an embodiment.
  • the bending section 511 is bent under the guidance of the guide portion 5111, and finally the folded state shown in FIG. 9 is formed .
  • a second stacking section 521 is provided between two adjacent first stacking sections 512, so that the first stacking section 512 and the second stacking section 521 are alternately arranged in sequence.
  • the bending section 511 and the second stacking section 521 do not overlap each other.
  • the bending section 511 is completely in a bending state, and the starting line of the bending section 511 is the area where the bending starts with respect to the first layered section 512. There is a gap between the bending section 511 and the second stacking section 521. At this time, both edges of the first stacking section 512 in the extension direction W extend beyond the second stacking section 521, and the second stacking section 521 faces the bending along the extension direction W. The end of the bent section 511 is not in contact with the bent section 511, thereby reducing the possibility of the electrode active material falling off or falling off due to interference with the bent section 511 at the end of the second laminated section 521.
  • the groove 5111a on each bending section 511 is located on the inner surface of the bending section 511, that is, after the first pole piece 51 is bent, the groove 5111a on each bending section 511 is They are all located on the side of the current collector 51 a close to the second stacking section 521.
  • the inner surface refers to the surface of the bent section 511 close to the second laminated section 521.
  • the outer surface of the bent section 511 refers to the surface of the bent section 511 away from the second laminated section 521.
  • the guiding portion 5111 on the bent section 511 after bending is disposed corresponding to the middle area of the second stacking section 521.
  • FIG. 10 schematically shows a top view structure in which the first stacking section 512 and the second stacking section 521 are stacked on each other.
  • the first pole piece 51 is an anode piece
  • the second pole piece 52 is a cathode piece.
  • the circumferential edges of the first stacking section 512 all extend beyond the second stacking section 521, so as to ensure that the second stacking section 521 as a whole is The coverage of the first stacking section 512 effectively reduces the possibility of lithium evolution caused by the second stacking section 521 exceeding the first stacking section 512.
  • the entire second stacking section 521 is covered by the first stacking section 512 means that the orthographic projection of the second stacking section 521 in the second direction Y is completely within the orthographic projection of the first stacking section 512 in the second direction Y, At this time, the projected area of the second stacking section 521 is smaller than the projected area of the first stacking section 512.
  • the distance between the first outer edge 5121 of the first laminated section 512 and the third outer edge 5211 of the corresponding second laminated section 521 is greater than or equal to 0.2 mm and less than or equal to 5 mm, preferably 0.5 mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or 4.5mm.
  • the first pole piece 51 is bent under the guidance of the guide portion 5111, so that the first pole piece 51 of each of the two adjacent first stacking sections 512 connected to the bending section 511 is
  • One outer edge 5121 is the same, that is, two first outer edges 5121 of two adjacent first stacked sections 512 on the same side have an included angle ⁇ .
  • the first outer edges 5121 of the two adjacent first stacked sections 512 are consistent, including the state shown in FIG. 10, that is, along the second direction Y, the projections of the two adjacent first stacked sections 512 coincide with each other.
  • the included angle ⁇ of the two first outer edges 5121 of the two adjacent first stacked sections 512 on the same side is 0°, so that in a top view, the two adjacent first stacked sections 512 have respective first outer edges 5121 Align with each other and stay consistent.
  • the first outer edges 5121 of two adjacent first stacked sections 512 are identical, which also includes the state shown in FIG. 11.
  • FIG. 11 schematically shows another top view structure after the first stacking section 512 and the second stacking section 521 are stacked on each other.
  • the two first outer edges 5121 of the two adjacent first stacked sections 512 on the same side in a plan view are not completely aligned.
  • the two first outer edges 5121 of the two adjacent first stacked sections 512 on the same side have an included angle ⁇ .
  • the included angle ⁇ is greater than 0° and less than or equal to 30° to ensure that the first stacked section 512 covers the second stacked section 521.
  • the included angle ⁇ is 5°, 10°, 15°, 20° or 25°.
  • the included angle ⁇ is the allowable error angle.
  • the first outer edge 5121 of the first layered section 512 after bending is offset, resulting in failure to coincide with the first outer edge 5121 of the other first layered section 512, but it can still be ensured that the first layered section 512 covers the first outer edge 5121.
  • the included angle ⁇ between the two first outer edges 5121 of two adjacent first stacking sections 512 on the same side is called the allowable error angle.
  • the first pole piece 51 of the embodiment of the present application is provided with a guide portion 5111 in the bending section 511, when the first pole piece 51 is bent during the production process of the electrode assembly 50, the first pole piece 51 Under the guidance of the guide portion 5111, it is easier to bend in the area of the guide portion 5111 of the bending section 511, so that the controllability and accuracy of the bending position of the bending section 511 can be improved by providing the guide portion 5111, thereby improving the two
  • the consistency of the first outer edges 5121 of the two adjacent first stacking sections 512 reduces the randomness of the bending position after the first pole piece 51 is bent, which results in the existence of the first stacking section 512 and the second stacking section 521 as There is a possibility that one of the negative electrodes cannot completely cover the other of the positive electrodes, thereby reducing the possibility of lithium evolution in the electrode assembly 50 manufactured by processing.
  • the electrode active material layer 51b coated on the current collector 51a itself has a certain brittleness.
  • the electrode active material layer 51b will be subjected to an external force, so that the electrode active material layer 51b may fall off or drop powder from the current collector 51a, which affects the electrochemical performance and safety performance of the electrode assembly 50 .
  • the groove 5111a of the present application is formed by reducing the corresponding electrode active material, so that during the bending process of the bending section 511, the groove 5111a provided is beneficial to reduce the inner portion carried by the corresponding electrode active material layer 51b. Stress, thereby reducing the possibility that the electrode active material layer 51b will fall off or fall off.
  • the same structure as the embodiment shown in FIG. 7 and FIG. 9 will not be repeated here, and the difference from the embodiment shown in FIG. 7 and FIG. 9 will be mainly described here.
  • the groove 5111a of one is located on one surface of the first pole piece 51, and the groove 5111a of the other is located on the other surface of the first pole piece 51, so After bending the first pole piece 51, the guide portion 5111 on the bending section 511 faces away from the space formed between the two adjacent first stack sections 512, that is, is located on the outer surface of the bending section 511, so that the groove 5111a is located on the side that bears the tensile stress when the bending section 511 is bent.
  • each bending section 511 is provided with a guide portion 5111.
  • the grooves 5111a of the respective guide portions 5111 on the two adjacent bending sections 511 are located on the same surface of the first pole piece 51. Therefore, in the first pole piece 51 after bending, in the two adjacent bending sections 511
  • the groove 5111a on one of the bending sections 511 is located on the outer surface of the bending section 511 so as to face away from the space formed between two adjacent first laminated sections 512, and the groove 5111a on the other bending section 511 is located on the outer surface of the bending section 511.
  • the inner surface of the bent section 511 thus faces the space formed between two adjacent first stacked sections 512.
  • FIG. 12 schematically shows a side view structure of an electrode assembly 50 according to another embodiment of the present application.
  • each bending section 511 is correspondingly provided with a guide portion 5111.
  • One guide part 5111 includes two grooves 5111a. When the first pole piece 51 is in the expanded state, the two grooves 5111a are correspondingly arranged along the thickness direction H of the first pole piece 51.
  • one of the two grooves 5111a is provided on the outer surface of the bending section 511 so as to face away from the space formed between two adjacent first lamination sections 512, and the other It is arranged on the inner surface of the bending section 511 so as to face the space formed between two adjacent first lamination sections 512.
  • two grooves 5111a are provided in the thickness direction H. At this time, the thickness of the weakened area 5110 is smaller, which is beneficial to further reduce the rigidity of the weakened area 5110.
  • the bending section 511 is more likely to bend in the weakened area 5110 area, which is beneficial to further improve the controllability and accuracy of the bending position. .
  • the internal stress of the electrode active material layers 51b on both sides of this embodiment will be relatively smaller when being bent, which is beneficial to further reduce the bending difficulty and There is a possibility that the electrode active material layer 51b may fall off or powder from the current collector 51a due to tensile or compressive stress.
  • the structures of the two grooves 5111a are the same.
  • the guide portion 5111 includes a groove 5111a.
  • the groove 5111a extends from the inner surface of the bent section 511 toward the current collector 51a.
  • the opening of the groove 5111a faces the second lamination section 521.
  • the groove 5111a penetrates the inner electrode active material layer 51b and part of the current collector 51a along the thickness direction H of the first pole piece 51.
  • at least one of a metal cutter, a laser cutter, and a liquid etching tool is used to form the groove 5111a.
  • a part of the groove 5111a is allowed to be opened to the current collector 51a, so as to ensure that the electrode active material in the corresponding area is removed, and the processing accuracy requirements and the processing difficulty are also reduced.
  • a part of the current collector 51a is removed to form a part of the groove 5111a, it is beneficial to further reduce the rigidity of the weakened area 5110 corresponding to the groove 5111a, making the bending section 511 easier to bend at the guide portion 5111 .
  • the groove 5111a extends from the bent section 511 away from the outer surface of the second laminated section 521 toward the current collector 51a.
  • the opening of the groove 5111a is located on the outer surface of the bending section 511, so that the opening of the groove 5111a faces away from the second laminated section 521.
  • the groove 5111a penetrates the outer electrode active material layer 51b and part of the current collector 51a along the thickness direction H of the first pole piece 51.
  • FIG. 13 schematically shows the structure of the first pole piece 51 in the multiple reciprocating folding state of another embodiment of the present application.
  • FIG. 14 schematically shows a side view structure of an electrode assembly 50 according to another embodiment of the present application.
  • the first pole piece 51 in the embodiment shown in FIG. 14 is the first pole piece 51 in the embodiment shown in FIG. 13.
  • the guide portion 5111 includes a groove 5111a.
  • the groove 5111a is recessed and extends from the inner surface of the bent section 511 toward the current collector 51a.
  • the opening of the groove 5111a faces the second lamination section 521.
  • the groove 5111a penetrates the inner electrode active material layer 51b along the thickness direction H of the first pole piece 51, and along the extension direction W of the first pole piece 51, the size of the groove 5111a is equal to the size of the bent section 511.
  • the portion of the inner electrode active material layer 51b corresponding to the bent section 511 is completely removed so that the surface of the current collector 51a facing the second laminated section 521 is exposed.
  • the portion corresponding to the bent section 511 on the outer electrode active material layer 51b is not removed but all remains.
  • the rear inner electrode active material layer 51b may be peeled off or powdered. In some other embodiments, the portion corresponding to the bent section 511 on the outer electrode active material layer 51b may be partially removed to form the guide portion 5111 on the outer electrode active material layer 51b.
  • the guide portion 5111 includes a groove 5111a.
  • the groove 5111a extends from the outer surface of the bent section 511 toward the current collector 51a.
  • the opening of the groove 5111a faces away from the second laminated section 521.
  • the groove 5111a penetrates the outer electrode active material layer 51b along the thickness direction H of the first pole piece 51, and along the extension direction W of the first pole piece 51, the size of the groove 5111a is equal to the size of the bent section 511.
  • the portion of the outer electrode active material layer 51b corresponding to the bent section 511 is completely removed, so that the surface of the current collector 51a facing away from the second laminated section 521 is exposed.
  • the portion of the inner electrode active material layer 51b corresponding to the bent section 511 is not removed but all remains.
  • the portion corresponding to the bent section 511 on the inner electrode active material layer 51b may also be partially removed to form the groove 5111a on the inner electrode active material layer 51b.
  • the rear outer electrode active material layer 51b may be peeled off or powdered.
  • FIG. 15 schematically shows the structure of the first pole piece 51 in the multiple reciprocating folding state of another embodiment of the present application.
  • the guide portion 5111 includes more than two grooves 5111a. Along the first direction X, two or more grooves 5111a are spaced apart.
  • the weakened area 5110 is provided corresponding to the groove 5111a along the thickness direction H of the first pole piece 51.
  • the number and positions of the weakened areas 5110 and the number and positions of the grooves 5111a are set in one-to-one correspondence.
  • the projection of the groove 5111a on a plane perpendicular to the first direction X may be a triangle.
  • the projection of the groove 5111a is not limited to a triangle, and may also be a trapezoid or a rectangle.
  • Each groove 5111a extends from the outer surface of the bent section 511 toward the current collector 51a, so that the opening of the groove 5111a faces away from the second laminated section 521.
  • the ratio of the sum of the size of each groove 5111a in the first direction X to the size of the bending section 511 in the first direction X is 0.4 to 0.8, preferably 0.4, 0.5, 0.6, 0.7 or 0.8.
  • each groove 5111a extends from the inner surface of the bent section 511 toward the current collector 51a, so that the opening of the groove 5111a faces the second stack section 521.
  • a plurality of grooves 5111a are respectively provided on the inner surface and the outer surface of the bending section 511.
  • the position of the weakened area 5110 corresponds to the position of the groove 5111a on the inner surface and the position of the groove 5111a on the outer surface in a one-to-one correspondence.
  • the groove 5111a on the inner surface and the groove 5111a on the outer surface jointly provide a weak area 5110 correspondingly.
  • FIG. 16 schematically shows the structure of the first pole piece 51 in the multiple reciprocating folding state of another embodiment of the present application.
  • the guide portion 5111 includes more than two perforations 5111b.
  • the through hole 5111b penetrates the two electrode active material layers 51b and the current collector 51a.
  • the size of the perforation 5111 b in the extending direction W of the first pole piece 51 is smaller than the size of the bent section 511 in the extending direction W of the first pole piece 51.
  • the shape of the through hole 5111b may be a rectangle, a square, an ellipse, a trapezoid, or a triangle.
  • the ratio of the sum of the size of each perforation 5111b in the first direction X to the size of the bending section 511 in the first direction X is 0.4 to 0.8, preferably 0.6 or 0.7.
  • the guide portion 5111 includes a through hole 5111b.
  • the ratio of the size of the perforation 5111b in the first direction X to the size of the bending section 511 in the first direction X is 0.4 to 0.8, preferably 0.6 or 0.7.
  • FIG. 17 schematically shows a side cross-sectional structure of an electrode assembly 50 according to another embodiment of the present application.
  • the first pole piece 51 included in the electrode assembly 50 is the first pole piece 51 of the embodiment shown in FIG. 16.
  • the perforation 5111b on the bent section 511 after bending is arranged corresponding to the middle area of the second laminated section 521.
  • the present application does not limit the position of the perforation 5111b, and the position of the perforation 5111b can also be set corresponding to other areas of the second stacking section 521 that are offset from the middle area along the second direction Y.
  • FIG. 18 schematically shows the structure of the first pole piece 51 in the multiple reciprocating folding state of another embodiment of the present application.
  • the guide portion 5111 includes more than two grooves 5111a and more than two perforations 5111b.
  • one or more grooves 5111a may be provided between two adjacent through holes 5111b.
  • one or more perforations 5111b may be provided between two adjacent grooves 5111a.
  • the guide portion 5111 may include other numbers of grooves 5111a and other numbers of perforations 5111b according to needs.
  • the guide part 5111 may include a groove 5111a and a perforation 5111b. As shown in Figure 18, in two adjacent bending sections 511, on one bending section 511, each groove 5111a extends from the outer surface of the bending section 511 toward the current collector 51a, so that the opening of the groove 5111a faces away from The second stacking section 521; on the other bending section 511, each groove 5111a extends from the inner surface of the bending section 511 toward the current collector 51a, so that the opening of the groove 5111a faces the second stacking section 521.
  • each groove 5111a on each bending section 511 extend from the outer surface of the bending section 511 toward the current collector 51a, so that the opening of the groove 5111a faces away from the second stack section 521.
  • each groove 5111a on each bending section 511 extends from the outer surface of the bending section 511 toward the current collector 51a, so that the opening of the groove 5111a faces the second stack section 521.
  • FIG. 19 schematically shows a side view structure of an electrode assembly 50 according to another embodiment of the present application.
  • the bending section 511 includes two connecting portions 511a and an intermediate transition portion 511b connecting the two connecting portions 511a.
  • the intermediate transition portion 511b and the connecting portion 511a are substantially perpendicular, and the intermediate transition portion 511b and the first stacking section 512 are substantially perpendicular.
  • the two connecting portions 511a of the bending section 511 are respectively connected to two adjacent first stacked sections 512. As shown in FIG.
  • each bending section 511 is provided with two guide portions 5111.
  • the two guide portions 5111 are arranged at intervals along the extending direction W of the first pole piece 51.
  • a part of each guide part 5111 is located at the connecting part 511a, and the other part is located at the intermediate transition part 511b.
  • the two guide portions 5111 are both provided on the inner surface of the bending section 511.
  • the inner side of the intermediate transition portion 511b has a partial electrode active material layer 51b.
  • the first pole piece 51 when the first pole piece 51 is performing the bending operation, it is easy to bend at the positions corresponding to the two guide parts 5111, thereby further improving the controllability and accuracy of the bending position, and further ensuring the two The first outer edges 5121 of adjacent first stacked sections 512 are consistent.
  • FIG. 20 schematically shows a side view structure of an electrode assembly 50 according to another embodiment of the present application.
  • the same structure as the embodiment shown in FIG. 9 will not be repeated here, and the differences from the embodiment shown in FIG. 9 will be mainly described here.
  • the isolation film 53 extends beyond the first pole piece 51, and the portion of the isolation film 53 that exceeds the first pole piece 51 wraps around the first pole piece 51 and the second pole piece 52, so that the isolation film 53 directly faces the first pole piece 51.
  • the first pole piece 51 and the second pole piece 52 form an insulation protection, which reduces the subsequent steps of insulating and packaging the folded first pole piece 51 and the second pole piece 52 again.
  • the electrode assembly 50 of the embodiment of the present application includes a first pole piece 51, a second pole piece 52 and an isolation film 53.
  • the first pole piece 51 has a first stacking section 512 and a bending section 511 which are alternately arranged.
  • the bending section 511 has a guide 5111.
  • the isolation film 53 and the second pole piece 52 need to be arranged in sequence on the first pole piece 51, and then the first pole piece 51 is bent multiple times to make the first stacking section 512 and the second pole piece 51
  • the second stacking sections 521 of the diode plate 52 are stacked on each other.
  • the guiding portion 5111 of the bending section 511 can guide the first pole piece 51 to bend at a predetermined position of the bending section 511 during the bending process of the first pole piece 51, thereby improving the controllability of the bending position of the first pole piece 51 Therefore, it is ensured that the first outer edge 5121 of the first stacking section 512 is consistent, so that one of the first stacking section 512 and the second stacking section 521 as the cathode sheet can cover the other as the anode sheet. In this way, in the electrode assembly 50 of the embodiment of the present application, the possibility of lithium evolution between the first pole piece 51 and the second pole piece 52 is low, which ensures that the secondary battery using the electrode assembly 50 has good electrochemical performance. And safety performance.
  • the embodiment of the present application also provides a method for forming the electrode assembly 50, which includes:
  • a first pole piece 51 is provided.
  • the first pole piece 51 includes a plurality of bending sections 511 and a plurality of first stacking sections 512, and each bending section 511 is used to connect two adjacent first stacking sections 512, wherein,
  • the bending section 511 has a guide part 5111;
  • a second pole piece 52 with the opposite polarity to the first pole piece 51 is provided.
  • the second pole piece 52 includes a plurality of second stack sections 521, and each second stack section 521 is disposed between two adjacent first stack sections 512. between;
  • the bending section 511 is bent along the guide portion 5111 so that the first outer edges 5121 of the two adjacent first stacked sections 512 connected to the bending section 511 are consistent.
  • the forming method of the electrode assembly 50 of the embodiment of the present application can be used to manufacture the electrode assembly 50 of the above-mentioned embodiments.
  • the molding method further includes a step of forming the guide portion 5111 by at least one of a metal cutter, a laser cutter, and a liquid etching tool.
  • the electrode active material layer 51b at a predetermined position on the bending section 511 is removed by mechanical cutting, laser cutting, water erosion, or chemical reaction, etc., so as to be on the first pole piece 51
  • the guide portion 5111 is formed.
  • the first pole piece 51 having the guide portion 5111 is provided with the isolation film 53 arranged in pairs, and is formed into The pair of isolation films 53 are located on opposite sides of the first pole piece 51.
  • the first pole piece 51 is bent along the guide portion 5111 of the bending section 511.
  • the guiding portion 5111 of the bending section 511 can guide the first pole piece 51 to bend at a predetermined position of the bending section 511 during the bending process of the first pole piece 51, thereby improving the controllability of the bending position of the first pole piece 51
  • the first outer edge 5121 of the two adjacent first stacking sections 512 connected with the bending section 511 is consistent, and the first stacking section 512 and the second stacking section 521 serve as one of the cathode sheets. One covers the other as the anode sheet.
  • the electrode assembly 50 manufactured by the method of forming the electrode assembly 50 of the embodiment of the present application has a low possibility of lithium evolution between the first pole piece 51 and the second pole piece 52, which ensures the application of the electrode assembly 50
  • the secondary battery has good electrochemical performance and safety performance.
  • the electrode assembly 50 may be a laminated cell formed by stacking a first pole piece 51, an isolation film 53, and a second pole piece 52.
  • the first pole piece 51 includes a plurality of bending sections 511 and a plurality of first stacking sections 512, wherein the bending section 511 is at least partially in a bent state after being bent.
  • the first pole piece 51 is a continuous extension structure as a whole. Along the extension direction W of the first pole piece 51 itself, the bending section 511 and the first stacking section 512 are alternately arranged.
  • the second pole piece 52 includes a plurality of second stacked sections 521, and each second stacked section 521 is disposed between two adjacent first stacked sections 512.
  • the first pole piece 51 is used as an anode piece and the second pole piece 52 is used as a cathode piece for illustration.
  • the first pole piece 51 may be a cathode piece
  • the second pole piece 52 is an anode piece.
  • the guide part 5111 may be a trace formed on the first pole piece 51.
  • the embodiment of the application provides a laminated battery cell production system, including
  • the first conveying mechanism 100 provides an anode sheet.
  • the anode sheet includes a plurality of bending sections 511 and a plurality of first stacking sections 512, and each bending section 511 is used to connect two adjacent first stacking sections 512;
  • Marking mechanism 300 marking mechanism 300 is used to set marks on the bending section 511, and the marks are used to guide the bending section 511 to bend during production;
  • the second conveying mechanism 400 provides a cathode sheet with a polarity opposite to that of the anode sheet.
  • the cathode sheet includes a plurality of second stacking sections 521, and each second stacking section 521 is disposed between two adjacent first stacking sections 512;
  • the lamination mechanism 600 is used to bend the bending section 511 along the trace, and to stack two adjacent first lamination sections 512 connected to the bending section 511.
  • the laminated cell production system includes a first conveying mechanism 100, an isolation film conveying mechanism 200, a marking mechanism 300, a second conveying mechanism 400, and a composite mechanism. 500 and a lamination mechanism 600.
  • the first conveying mechanism 100 is used to provide anode sheets.
  • the isolation film conveying mechanism 200 is arranged downstream of the first conveying mechanism 100 and is used to provide a pair of isolation films 53, and the pair of isolation films 53 are used to clamp the anode sheet.
  • the marking mechanism 300 is arranged upstream of the isolation membrane conveying mechanism 200.
  • the marking mechanism 300 may be located between the first conveying mechanism 100 and the isolation membrane conveying mechanism 200, and the marking mechanism 300 is used to set on the anode sheet. trace.
  • the second conveying mechanism 400 is provided downstream of the isolation film conveying mechanism 200 and is used to provide the isolation film 53 with a plurality of cathode sheets.
  • the composite mechanism 500 is arranged downstream of the second conveying mechanism 400 and is used to composite the anode sheet, the isolation film 53 and the cathode sheet to form a stack to be laminated.
  • the lamination mechanism 600 is arranged downstream of the composite mechanism 500, and the lamination mechanism 600 is used to reciprocally stack the group of sheets to be laminated along the traces to form a laminated cell.
  • upstream and downstream refer to the sequence of the production sequence of the laminated cell, and do not limit the spatial position between the components.
  • a crease, etc. optionally, it may refer to a structure formed by a part of the material being removed after a part of the material is removed from the anode sheet by a material removal component.
  • the laminated battery cell production system provided by the embodiment of the present application can meet the production requirements of the laminated battery cell, and at the same time, can reduce the safety hazards of the laminated battery core.
  • the first conveying mechanism 100 may include a first unwinding device 101, a first tape splicing device 102, a first tension balance device 103 and a first correction device 104.
  • the first correcting device 104 is arranged downstream of the first unwinding device 101, and the first tape splicing device 102 and the first tension balance device 103 are both located between the first unwinding device 101 and the first correcting device 104.
  • the first unwinding device 101 may include a first unwinding roller and a driving component that drives the first unwinding roller to make a rotary motion.
  • the anode sheet is wound on the first unwinding roller, and the first unwinding roller rotates to realize the positive effect on the anode sheet. Release.
  • the first strapping device 102 can be arranged downstream of the first unwinding device 101, and when the anode sheet is unrolled, this mechanism can be used for strapping to ensure continuous production.
  • the first correction device 104 is located upstream of the marking mechanism 300, and it can be monitored in real time by the detection device or at a certain time interval to monitor whether the anode sheet is within the predetermined range of the marking mechanism 300. The position is adjusted to ensure that the anode sheet is always within the marking range of the marking mechanism 300.
  • the first tension balancing device 103 may be located downstream of the first strapping device 102.
  • the first tension balancing device may be used.
  • the device 103 adjusts to keep the tension of the anode sheet within a certain range.
  • the marking mechanism 300 includes a first marking component 301 and a second marking component 302 arranged at intervals, in the thickness direction H of the anode sheet.
  • a marking component 301 is used to provide traces on one surface of the anode sheet
  • the second marking component 302 is used to provide traces on the other surface of the anode sheet.
  • the first marking component 301 is one of a metal cutter, a laser cutter, and a liquid etching tool.
  • the first marking component 301 in the above form can be realized by mechanical cutting or laser cutting. , Water flow erosion or chemical reaction to remove the material at the predetermined position to form a trace on one surface of the anode sheet in the thickness direction H.
  • the operation process is simple, and the formation of traces is easy.
  • the second marking component 302 of the laminated cell production system of the foregoing embodiments is one of a metal cutter, a laser cutter, and a liquid etching tool.
  • the second marking component 302 can remove the material at a predetermined position by mechanical cutting, laser cutting, water erosion, or chemical reaction to form a mark on the other surface of the anode sheet in the thickness direction H.
  • the operation process is simple, and the formation of traces is easy.
  • a first dust removal device 105 is provided downstream of the marking mechanism 300.
  • the first dust removal device 105 is located between the marking mechanism 300 and the isolation film conveying mechanism 200.
  • the first dust removal device 105 includes Dust removal is performed on the front and/or back of the anode sheet to achieve the purpose of cleaning the anode sheet.
  • the first dust removal device 105 may include a fur brush and a dust suction component. During the operation of the anode sheet, the dust can be peeled off by the fur brush, and the dust peeled off from the anode sheet can be sucked and recovered by the dust suction device to ensure that the anode sheet is clamped.
  • the cleanliness of the isolation film 53 can further optimize the electrical performance of the laminated cell formed by stacking.
  • the isolation film conveying mechanism 200 may be further located downstream of the second marking member 302 of the marking mechanism 300, and the isolation film conveying mechanism 200 includes a pair of isolation film conveying devices, two of the same pair. Two isolation film conveying devices can be arranged oppositely.
  • Each isolation film conveying device includes an isolation film unwinding roller 21 and a driving component that drives the isolation film unwinding roller to rotate.
  • the isolation film 53 is wound on the isolation film unwinding roller, and the isolation is realized by the rotation of the isolation film unwinding roller. When the film 53 is released, the corresponding isolation film 53 can be guided to a predetermined position by the guide wheel to clamp the anode sheet with traces.
  • the second conveying mechanism 400 may include a second unwinding device 401, a second tape connecting device 402, a second tension balance device 403, a second correction device 404, The cutting device 405 and the second dust removal device 406.
  • the second unwinding device 401 may include a second unwinding roller and a driving component that drives the second unwinding roller to rotate.
  • the cathode sheet is wound on the second unwinding roller and is rotated by the second unwinding roller. Realize the release of the cathode sheet.
  • the second tape splicing device 402 may be arranged downstream of the second unwinding device 401, and when the cathode sheet is unrolled, this mechanism may be used for tape splicing to ensure continuous production.
  • the second tension balance device 403 is located downstream of the second tape splicing device 402.
  • the second tension balance device can be used 403 adjusts to keep the tension of the cathode sheet within a certain range.
  • the second correction device 404 is located downstream of the second tension balance device 403, and it can be monitored in real time by the detection device or at a certain time interval to monitor whether the cathode sheet is within the predetermined range of the second correction device 404. If not, it needs to be corrected. The position of the cathode sheet is adjusted to ensure that the cathode sheet is always within the cutting range of the cutting mechanism 45.
  • the cutting device 405 is arranged downstream of the second correction device 404, and is used to cut the strip-shaped cathode sheet into a plurality of block-shaped structures of a predetermined size.
  • the second dust removal device 406 is located downstream of the cutting device 405, and is used to receive the block-shaped cathode sheet and dust the cathode sheet to ensure the cleanliness of the cathode sheet connected to the isolation membrane 53.
  • the second dust removal device 406 may include a belt brush 4061 and a dust suction device 4062.
  • the cathode sheet cut by the cutting device 405 falls to the belt brush 4061 of the second dust removal device 406, and the cathode sheet can be transported to the composite mechanism 500 through the belt brush 4061. Located in the direction and connected to the isolation membrane 53.
  • the dust on the cathode sheet can be peeled off by the belt brush 4061 and sucked and recovered by the dust collector 4062, so as to ensure the cleanliness of the cathode sheet connected to the isolation film 53, thereby making the laminated sheet produced
  • the battery cell can better meet its electrical requirements.
  • the second conveying mechanism 400 may be arranged in pairs according to requirements, and the paired second conveying mechanisms 400 may be opposite and synchronously or alternately providing cathode sheets to the same isolation film 53 or different isolation films 53.
  • the composite mechanism 500 of the laminated cell production system may include a heating transmission component 501 and a roller pressing component 502.
  • the heating transmission component 501 is used for heating The separation film 53 and the cathode sheet are transported, and the rolling member 502 is arranged downstream of the heating transmission assembly 501 and is used to roll the heated separation film 53 and the cathode sheet, so that the two are compositely connected.
  • the composite mechanism 500 adopts the above-mentioned structural form, has a simple structure, and can ensure the composite effect between the cathode sheet and the isolation membrane 53 holding the anode sheet.
  • the heating transmission assembly 501 includes a heating component 5011 and a conveying component 5012.
  • the heating member 5011 is used to heat the separator 53 and the cathode sheet.
  • the conveying component 5012 includes a transmission wheel 5012a and a transmission belt 5012b matched with the transmission wheel 5012a.
  • the transmission belt 5012b is arranged around the heating component 5011 and is used for conveying the isolation film 53 and the cathode sheet.
  • the cathode sheet carries the PVDF adhesive, and the corresponding isolation film 53 is also attached with the PVDF adhesive, the adhesives of both sides can be better bonded together by heating and squeezing.
  • the heating transmission assembly 501 adopts the above structure, which can meet the heating and bonding requirements.
  • the restricting conveying component 5012 includes a transmission wheel 5012a and a transmission belt 5012b that cooperates with the transmission wheel 5012a, by restricting the relationship between the transmission belt 5012b and the heating component 5011
  • the cathode sheet on the surface of the isolation film 53 can be protected and transported by the transmission belt 5012b, so that the cathode sheet can move synchronously with the isolation film 53, to ensure the stability of the relative positions of the two, thereby ensuring Recombination requirements between the cathode sheet and the isolation membrane 53.
  • the heating transmission assembly 501 adopts the above-mentioned structural form, so that after the cathode sheet is sufficiently heated by the heating part 5011, the cathode sheet and the isolation film 53 are connected to each other through the rolling part 502 At the same time, the purpose of making the stack to be laminated is achieved.
  • the heating transmission assembly 501 uses a transmission belt to replace the disposable PET film. By eliminating the PET film, the time for unwinding and winding of the PET film is eliminated, which can increase the utilization rate of the equipment and reduce the production. manufacturing cost.
  • the heating component 5011 may be an oven, a heat exchanger, and other components capable of providing thermal energy to complete heating of at least the cathode sheet and the isolation film 53.
  • the oven when the heating component 5011 adopts an oven structure, can be made of a metal plate with multiple heating tubes evenly placed inside, and the heating tubes are heated to make the heating oven reach a set temperature.
  • the temperature of the oven makes the cathode sheet and the isolation film 53 reach a certain temperature by means of heat radiation.
  • the transmission belt 5012b can be a belt, the number of which can be set according to the size of the cathode sheet. In some optional embodiments, the number of the transmission belt 5012b can be more than two, and the two or more transmission belts 5012b are spaced apart from each other and transported together.
  • the cathode sheet and the isolating film 53 ensure the stability of the force applied to the cathode sheet, thereby ensuring that the cathode sheet can operate synchronously and smoothly with the isolating film 53.
  • the number of heating transmission components 501 is more than two, and every two heating transmission components 501 form a group and are arranged oppositely.
  • the two heating transmission components 501 of the same group pass through oppositely arranged transmission belts 5012b.
  • the cathode sheet and the separator 53 are clamped and transported together.
  • the heating transmission components 501 By arranging the heating transmission components 501 in pairs, and making the paired heating transmission components 501 clamp and act on the cathode sheet and the isolation film 53 together, it can be ensured that the cathode sheets on the two isolation films 53 can be separated from their respective counterparts.
  • the membrane 53 operates synchronously to better ensure the stability of the relative position of each cathode sheet and the isolation film 53, so that the position of the cathode sheet on the isolation film 53 is accurate before the rolling member 502.
  • the rolling member 502 may include squeezing rollers 5021 arranged in pairs, and the heated cathode sheet and the separator 53 can be squeezed by the squeezing rollers 5021 arranged in pairs, thereby making The two are compositely connected and form a stack to be laminated together with the anode sheet.
  • the rolling member 502 and/or the transmission belt 5012b is provided with a dust removal member 503, that is, at least one of the rolling member 502 and the transmission belt 5012b is provided with a dust removal member 503, and the dust removal member 503 may also The combination of a brush and a dust suction device is used to remove dust from the laminated group to better ensure the performance of the laminated cell.
  • the laminated cell production system may have a laminated mechanism 600 including a power source 601 and a swing mechanism 602.
  • the swing mechanism 602 There is a gap 6021 for the group of sheets to be laminated to pass through.
  • the power source 601 is connected to the swing mechanism 602 and drives the swing mechanism 602 to reciprocate along a predetermined track to reciprocally stack the group of sheets to be laminated and form a laminated cell.
  • the lamination mechanism 600 adopts the above-mentioned structural form, has a simple structure and low cost, and can reciprocally fold the group of laminations to be laminated according to the traces on the anode sheet, so that the formed lamination cell has better performance.
  • the swing mechanism 602 includes a mounting base 6022 and a pair of clamping rollers 6023 connected to the mounting base 6022, a gap 6021 is formed between the pair of clamping rollers 6023, and the swing mechanism 602 It is connected to the power source 601 through the mounting base 6022.
  • the swing mechanism 602 adopts the above-mentioned structural form, which can be easily connected with the power source 601 to better meet the power transmission. At the same time, it can also meet the requirements of the stack to be laminated, so that it can be folded back and forth according to the predetermined traces to ensure the power of the laminated sheets. Core group requirements.
  • the power source 601 may adopt a drive motor
  • the mounting base 6022 may include a pair of mounting plates arranged at intervals
  • the clamping roller 6023 is located between the two mounting plates and the axial ends are respectively connected to the corresponding mounting plates .
  • the swing mechanism 602 further includes a pair of limit reinforcement rollers 6024, and the limit reinforcement roller 6024 is located upstream of the clamping roller 6023 and connected to the mounting seat 6022.
  • the limit reinforcement roller 6024 By providing the limit reinforcement roller 6024, the tilt angle of the stack to be laminated can be limited when the swing mechanism 602 is moving, so as to better ensure that the stack to be laminated can be folded back and forth according to the corresponding traces, thereby ensuring the accuracy of the stack.
  • the setting of the limit reinforcement roller 6024 can also strengthen the mounting seat 6022, avoiding the clamping between the mounting seat 6022 and the clamping roller 6023 or in pairs when the swing mechanism 602 swings along a predetermined track.
  • the relative position between the holding rollers 6023 is changed, which can also better ensure the lamination requirements of the laminated cells.
  • the laminated battery cell production system provided in the foregoing embodiments further includes a main conveying mechanism 700, the main conveying mechanism 700 is located between the composite mechanism 500 and the laminated mechanism 600, and the main conveying mechanism 700 is used for In order to provide operating power to the stack to be laminated, to better ensure that the stack to be laminated runs toward the stacking mechanism 600 at a predetermined speed.
  • the driving motor used to provide power to the anode sheet mentioned in the foregoing embodiments may be the main conveying mechanism 700.
  • the laminated cell production system includes a first conveying mechanism 100, an isolation film conveying mechanism 200, a marking mechanism 300, a second conveying mechanism 400, a composite mechanism 500, and a laminated mechanism 600. Because of the setting of the marking mechanism 300 and the setting of traces on the anode sheet, the cutting step of the anode sheet can be omitted, the generation of burrs can be avoided, the safety of the laminated cell can be ensured, and the production system of the laminated cell can be simplified. Structure.
  • An embodiment of the present application also provides a method for forming a laminated battery core, including:
  • S100 Provide an anode sheet, and set a plurality of traces on the anode sheet, and the plurality of traces are distributed at intervals in the extension direction W of the anode sheet;
  • the laminated cell forming method provided in the embodiments of the present application may be implemented by the laminated cell production system mentioned in the foregoing embodiments.
  • the anode sheet is provided in a continuous belt-like structure, and the trace is the structure formed by the material removed part after part of the material is removed from the anode sheet by the material removal component, wherein the material removal component is a metal
  • the material removal component is a metal
  • the material removal component may be the marking mechanism 300 mentioned in the foregoing embodiments.
  • part of the material removed by the material removal component on the anode sheet may be an electrode active material, and the depth of the trace at this time is less than or equal to the thickness of the electrode active material layer 51b.
  • the material removal member removes a part of the material on the anode sheet, and may also be the electrode active material and the material of the current collector 51a. In this case, the depth of the trace is greater than the thickness of the electrode active material layer 51b.
  • step S100 among the two adjacent traces, one trace is located on one surface of the anode sheet in the thickness direction H, and the other trace is located on the other surface of the anode sheet in the thickness direction H.
  • the anode sheet may be provided by the first conveying mechanism 100, and the corresponding marking mechanism 300 may be provided on the anode sheet. trace.
  • the isolation films 53 arranged in pairs may be provided by the isolation film transport mechanism 200.
  • one of the two adjacent cathode plates is connected to one of the pair of isolation films 53, and the other is connected to the pair of isolation films.
  • the other of 53 the molded laminated cell can better meet the use requirements and optimize the electrical performance of the laminated cell.
  • the cathode sheet may be provided by the second conveying mechanism 400 in the laminated cell production system provided by any of the foregoing embodiments.
  • step S400 the lamination mechanism 600 in the laminated cell production system provided by any of the above embodiments may stack the to-be-laminated group to complete the production requirements of the laminated cell.
  • the laminated cell forming method provided in the embodiments of the present application can meet the production requirements of the laminated cell, and at the same time can reduce the hidden safety hazard of the laminated cell.
  • the thickness of the area where the trace is formed on the anode sheet is smaller than the other anode sheet.
  • the thickness of the area where no trace is formed. The setting of the trace can ensure that the anode sheet is easier to be folded in the area where the trace is located than in other areas.
  • the trace may be the groove 5111a of the foregoing embodiments formed after material is removed on the anode sheet.
  • the shape of the groove 5111a may be a U-shaped groove, a triangular groove, or other regular-shaped polygonal grooves or irregularly shaped special-shaped grooves.
  • the trace penetrates the anode sheet in the width direction of the anode sheet.
  • the belt width direction of the anode sheet is the same as the first direction X, and the belt width direction is perpendicular to its extending direction W and thickness direction H.
  • the number of grooves 5111a is more than two. Along the first direction X, two or more grooves 5111a are spaced apart. Or the number of grooves 5111a is one.
  • the trace may be the through hole 5111b of the foregoing embodiments formed after material is removed on the anode sheet.
  • the through hole 5111b penetrates the two electrode active material layers 51b and the current collector 51a.
  • the shape of the through hole 5111b may be a rectangle, a square, an ellipse, a trapezoid, or a triangle.
  • the number of the perforations 5111b is more than two, and along the first direction X, the two or more perforations 5111b are arranged at intervals. In one embodiment, the number of perforations 5111b is one.
  • the traces may be the grooves 5111a and the perforations 5111b of the foregoing embodiments formed after the material is removed on the anode sheet.
  • the number of perforations 5111b is more than two, and along the first direction X, one or more grooves 5111a may be provided between two adjacent perforations 5111b.
  • the number of grooves 5111a is more than two, and one or more perforations 5111b may be provided between two adjacent grooves 5111a.

Abstract

本申请涉及一种电极组件及其成型方法和生产系统、二次电池、电池模块以及装置。电极组件包括：第一极片，包括多个折弯段和多个层叠设置的第一层叠段，每个折弯段用于连接两个相邻的第一层叠段，其中，折弯段具有引导部，用于在生产时引导折弯段折弯；与第一极片极性相反的第二极片，第二极片包括多个第二层叠段，每个第二层叠段设置于相邻两个第一层叠段之间。本申请实施例的电极组件能够保证第一极片和第二极片层叠后处于预定位置，以此保证二次电池具有良好的电化学性能。

Description

电极组件及其成型方法和生产系统、二次电池、电池模块以及装置
相关申请的交叉引用
本申请要求享有于2019年12月04日提交的名称为“叠片电芯生产系统以及叠片电芯成型方法”的中国专利申请201911224967.7的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，特别是涉及一种电极组件及其成型方法和生产系统、二次电池、电池模块以及装置。
背景技术
随着社会和科学技术的发展，二次电池被广泛地应用于为高功率的装置提供动力，例如电动车辆等。二次电池通过将多个电池单元串联或并联连接形成电池模块，以实现较大的容量或功率。
二次电池包括阴极片和阳极片，阴极片和阳极片通过堆叠的方式形成电极组件。然而，在阴极片和阳极片相互堆叠后，阴极片和阳极片中的至少一者会偏离预定位置，从而影响二次电池的电化学性能。
发明内容
本申请实施例提供一种电极组件及其成型方法和生产系统、二次电池、电池模块以及装置，能够保证第一极片和第二极片层叠后处于预定位置，以此保证二次电池具有良好的电化学性能。
一方面，根据本申请实施例提出一种电极组件，用于二次电池，其包括：
第一极片，包括多个折弯段和多个层叠设置的第一层叠段，每个折弯段用于连接两个相邻的第一层叠段，其中，折弯段具有引导部，用于在生 产时引导折弯段折弯；与第一极片极性相反的第二极片，第二极片包括多个第二层叠段，每个第二层叠段设置于相邻两个第一层叠段之间。
另一方面，根据本申请实施例提出一种二次电池，其包括如上述实施例的电极组件。
又一方面，根据本申请实施例提出一种电池模块，其包括如上述实施例的二次电池。
又一方面，根据本申请实施例提出一种装置，其包括如上述实施例的二次电池，二次电池提供电能。
再一方面，根据本申请实施例提出一种电极组件成型方法，其包括：
提供第一极片，第一极片包括多个折弯段和多个第一层叠段，每个折弯段用于连接两个相邻的第一层叠段，其中，折弯段具有引导部；
提供与第一极片极性相反的第二极片，第二极片包括多个第二层叠段，每个第二层叠段设置于相邻两个第一层叠段之间；
沿引导部折弯折弯段，以使与折弯段相连接的两个相邻第一层叠段层叠。
再一方面，根据本申请实施例提出一种电极组件生产系统，其中，包括：
第一输送机构，提供第一极片，第一极片包括多个折弯段和多个层叠设置的第一层叠段，每个折弯段用于连接两个相邻的第一层叠段；
制痕机构，制痕机构用于在折弯段上设置引导部，引导部用于在生产时引导折弯段折弯；
第二输送机构，提供与第一极片极性相反的第二极片，第二极片包括多个第二层叠段，每个第二层叠段设置于相邻两个第一层叠段之间；
叠片机构，叠片机构用于将折弯段沿引导部折弯，并且使与折弯段相连接的两个相邻第一层叠段层叠。
本申请的有益效果如下：通过在折弯段设置引导部，在生产时，折弯段能够沿着引导部折弯，保证折弯段相对于第一层叠段折弯时折弯位置更准确，使得第一极片和第二极片层叠后处于预定位置，从而保证二次电池具有良好的电化学性能。
附图说明
下面将通过参考附图来描述本申请示例性实施例的特征、优点和技术效果。
图1是本申请一实施例公开的一种车辆的结构示意图；
图2是本申请一实施例公开的一种电池组的分解结构示意图；
图3是本申请一实施例公开的一种电池模组的局部结构示意图；
图4是本申请一实施例公开的一种二次电池的分解结构示意图；
图5是本申请一实施例的第一极片折弯前的局部俯视结构示意图；
图6是图5所示实施例的第一极片的侧视结构示意图；
图7是图5所示实施例的第一极片折弯状态的结构示意图；
图8是图5所示实施例的第一极片、第二极片和隔离膜连接结构示意图；
图9是本申请一实施例的电极组件的侧视结构示意图；
图10是图9所示实施例的电极组件的俯视第一种结构示意图；
图11是图9所示实施例的电极组件的俯视第二种结构示意图；
图12是本申请另一实施例的电极组件侧视结构示意图；
图13是本申请另一实施例的第一极片折弯状态的结构示意图；
图14是包括图13所示实施例的第一极片的电极组件侧视结构示意图；
图15是本申请另一实施例的第一极片折弯状态的结构示意图；
图16是本申请另一实施例的第一极片折弯状态的结构示意图；
图17是包括图16所示实施例的第一极片的电极组件侧视图的剖视结构示意图；
图18是本申请另一实施例的第一极片折弯状态的结构示意图；
图19是本申请另一实施例的电极组件侧视结构示意图；
图20是本申请另一实施例的电极组件侧视结构示意图；
图21是本申请一个实施例的叠片电芯生产系统的结构示意图；
图22是本申请实施例的第一输送机构的结构示意图；
图23是本申请实施例的阳极片与制痕机构的结构示意图；
图24是本申请实施例的具有痕迹的阳极片的示意图；
图25是本申请实施例的第二输送机构的结构示意图；
图26是本申请实施例的复合机构的结构示意图；
图27是本申请实施例的加热传输组件的结构示意图；
图28是图27所示结构的俯视图；
图29是本申请实施例的叠片机构的结构示意图；
图30是图29所示结构的仰视图；
图31是本申请实施例的叠片机构与主输送机构以及待叠片组的配合示意图。
在附图中，各个附图未必按照实际的比例绘制。
标记说明：
1、车辆；
10、电池组；
20、电池模组；
30、二次电池；
40、壳体；
50、电极组件；50a、主体部；50b、极耳；
51、第一极片；51a、集流体；51b、电极活性材料层；511、折弯段；511a、连接部；511b、中间过渡部；5110、薄弱区；5111、引导部；5111a、凹槽；5111b、穿孔；5112、第二外边缘；512、第一层叠段；5121、第一外边缘；
52、第二极片；521、第二层叠段；5211、第三外边缘；
53、隔离膜；
60、顶盖组件；61、顶盖板；62、电极端子；
70、转接片；
W、延伸方向；H、厚度方向；X、第一方向；Y、第二方向；Z、弯折方向；
100、第一输送机构；101、第一放卷装置；102、第一接带装置； 103、第一张力平衡装置；104、第一纠偏装置；105、第一除尘装置；
200、隔离膜输送机构；
300、制痕机构；301、第一制痕部件；302、第二制痕部件；
400、第二输送机构；401、第二放卷装置；402、第二接带装置；403、第二张力平衡装置；404、第二纠偏装置；405、裁切装置；406、第二除尘装置；4061、皮带刷；4062、吸尘装置；
500、复合机构；501、加热传输组件；5011、加热部件；5012、输送部件；5012a、传动轮；5012b、传动带；502、辊压部件；5021、挤压辊；503、除尘部件；
600、叠片机构；601、动力源；602、摆动机构；6021、间隙；6022、安装座；6023、夹持辊；6024、限位加强辊；
700、主输送机构。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或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的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
为了更好地理解本申请，下面结合图1至图31对本申请实施例进行描述。
本申请实施例提供一种使用二次电池30作为电源的装置。该装置可以但不仅限于为车辆、船舶或飞行器等。参见图1所示，本申请的一个实施例提供一种车辆1，其包括车辆主体和电池模块。电池模块设置于车辆主体。其中，车辆1可以是纯电动汽车，也可以是混合动力汽车或增程式汽车。车辆主体设置有与电池模块电连接的驱动电机。电池模块向驱动电机提供电能。驱动电机通过传动机构与车辆主体上的车轮连接，从而驱动汽车行进。可选地，电池模块可水平设置于车辆主体的底部。
参见图2所示，电池模块可以是电池组10。电池组10的设置方式有多种。在一些可选的实施例中，电池组10包括箱体和设置于箱体内的电池模组20。电池模组20的数量为一个或多个。一个或多个电池模组20排列布置于箱体内。箱体的类型不受限制。箱体可为框状箱体、盘状箱体或盒状箱体等。可选地，箱体包括用于容纳电池模组20的下箱体和与下箱体盖合的上箱体。上箱体和下箱体盖合后形成容纳电池模组20的容纳部。可以理解地，电池模块也可以是电池模组20，即将电池模组20直接设置于车辆主体上。
参见图3所示，电池模组20包括多个二次电池30。电池模组20的设置方式有多种。在一个实施例中，电池模组20包括容纳部和位于容纳部内的多个二次电池30。多个二次电池30在容纳部内并排设置。容纳部的设置方式有多种，例如容纳部包括外壳和盖设于外壳处的盖板；或者，容纳部包括相继围合连接的侧板和端板；或者，容纳部包括相对设置的两端板及环绕于端板和二次电池30外的箍带。
申请人在注意到现有二次电池存在电化学性能较差的问题之后，发现是由于成型的电极组件中的阴极片和阳极片中的至少一者偏离预定位置，因此影响了二次电池存在电化学性能。申请人进一步发现成型的电极组件中的阴极片和阳极片中的至少一者偏离预定位置，导致电极组件存在析锂现象，从而影响了二次电池存在电化学性能。由此推测原因可能是阳极片超出阴极片外边缘的部分的尺寸过小或者阳极片不超出阴极片外边缘。
通过对电极组件的装配过程进行分析，申请人对析锂现象进一步研究发现，以阳极片为连续设置、阴极片为间断设置为例，阳极片在折弯过程中很难能沿预定区域进行折弯，导致阴极片和阳极片在堆叠形成电极组件后，存在阳极片超出阴极片外边缘的部分的尺寸过小的情况，容易导致电极组件存在析锂现象，从而影响二次电池的电化学性能和安全性能。
基于申请人发现的上述问题，申请人对电极组件50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4所示，本申请实施例的二次电池30包括壳体40、设置于壳体40内的电极组件50以及与壳体40密封连接的顶盖组件60。
本申请实施例的壳体40为方形结构或其他形状。壳体40具有容纳电极组件50和电解液的内部空间以及与内部空间相连通的开口。壳体40可以由例如铝、铝合金或塑料等材料制造。
本申请实施例的顶盖组件60包括顶盖板61以及电极端子62。本申请实施例的顶盖板61具有相对的外表面和内表面以及贯穿外表面和内表面的电极引出孔。顶盖板61可以盖闭壳体40的开口并与壳体40密封连接。顶盖板61的内表面朝向电极组件50。电极端子62设置于顶盖板61并与电极引出孔相对应设置。电极端子62的一部分露出于顶盖板61的外表面，并用于与汇流片焊接。
本申请实施例的电极组件50包括主体部50a以及从主体部50a上延伸出的极耳50b。本申请实施例中，主体部50a相对的两个端面上各自延伸出一个极耳50b。在其它一些实施例中，主体部50a相对的两个端面中的一个端面延伸出两个极耳50b。两个极耳50b的极性相反，一个为阴极耳，另一个为阳极耳。阴极片活性物质被涂覆在阴极片的涂覆区上，而阳极片活性物质被涂覆到阳极片的涂覆区上。主体部50a的涂覆区延伸出的多个未涂覆区层叠作为极耳50b。阴极耳从阴极片的涂覆区延伸出，而阳极耳从阳极片的涂覆区延伸出。转接片70用于连接电极组件50的极耳50b与电极端子62。
在一个实施例中，图5示意性地显示了第一极片51处于展开状态的局部结构。参见图5所示，第一极片51包括多个折弯段511和多个第一 层叠段512，其中，折弯段511在被折弯后至少部分处于弯折状态。第一极片51整体为连续延伸结构。沿第一极片51自身的延伸方向W，折弯段511和第一层叠段512交替设置。每个折弯段511连接相邻两个第一层叠段512。沿第一方向X，每个第一层叠段512具有相对的两个第一外边缘5121，而每个折弯段511具有相对的两个第二外边缘5112。第一方向X与第一极片51的宽度方向相同。第一方向X与延伸方向W相垂直。本实施例中，沿第一方向X，位于同侧的第一外边缘5121和第二外边缘5112相齐平。第一极片51还具有沿第一方向X延伸超出第一层叠段512的第一外边缘5121的极耳50b。极耳50b的数量和位置与第一层叠段512的数量和位置一一对应设置。本实施例中，第一极片51具有设置于折弯段511的引导部5111。引导部5111的数量可以与折弯段511的数量相同。当然，可以理解地，所有折弯段511中部分数量的折弯段511设置引导部5111，而其它的折弯段511可以不设置引导部5111。引导部5111用于在生产时引导折弯段511折弯。在生产过程中，对第一极片51施加外力进行折弯操作时，由于折弯段511上设置有引导部5111，因此折弯段511更容易在引导部5111所在区域实现折弯，从而有利于提高折弯位置的可控性以及准确性，进而保证第一极片51和第二极片52各自处于预定位置，以此保证二次电池30具有良好的电化学性能。
图6示意性地显示了图5所示实施例的第一极片51的侧视结构。第一极片51包括集流体51a以及涂覆于集流体51a上的电极活性材料层51b。集流体51a具有沿第一极片51的厚度方向H相对的两个表面。两个电极活性材料层51b分别设置于两个表面。在一个示例中，第一极片51为阴极片时，集流体51a的材料为铝或铝合金等金属材料。第一极片51为阳极片时，集流体51a的材料为铜或铜合金等金属材料。引导部5111可以为事物留下的痕迹。可选地，其可以是指通过材料去除部件在第一极片51上去除部分电极活性材料层51b，或者，在第一极片51上去除部分电极活性材料层51b和部分集流体51a后所形成的结构。
本实施例中，每个折弯段511上设置有引导部5111。本实施例中，引导部5111包括凹槽5111a。凹槽5111a从第一极片51的表面沿第一极片 51的厚度方向H朝靠近集流体51a的方向凹陷并延伸。相邻两个折弯段511中，一个折弯段511设置的凹槽5111a位于集流体51a的一侧，另一个折弯段511设置的凹槽5111a位于集流体51a的另一侧。凹槽5111a可以通过在第一极片51上去除部分的电极活性材料层51b形成。或者，在集流体51a上涂覆电极活性材料时，在对应的位置涂覆较少的电极活性材料以形成该凹槽5111a。本实施例中，沿厚度方向H，凹槽5111a的深度可以等于电极活性材料层51b的厚度。凹槽5111a延伸至集流体51a的表面，但不延伸至集流体51a内。但是，可以理解地，凹槽5111a的深度也可以小于电极活性材料层51b的厚度，从而沿厚度方向H凹槽5111a并不贯穿电极活性材料层51b，此时，凹槽5111a与集流体51a之间还设有一部分电极活性材料。在本实施例中，由于凹槽5111a的深度小于或者等于电极活性材料层51b的厚度，使得形成凹槽5111a时不会损伤集流体51a，相对于凹槽5111a的深度大于电极活性材料层51b的厚度的情形(此时会损伤集流体51a)，从而集流体51a的强度不会受到影响。本实施例中，凹槽5111a的口部大于或等于凹槽5111a的底部。在一个示例中，凹槽5111a在垂直于第一方向X的平面投影为V形。但凹槽5111a的投影并不限于V形，也可以是U形或矩形等。由于凹槽5111a的口部大于或等于凹槽5111a的底部，从而一方面有利于保证折弯段511的折弯位置，同时该凹槽5111a易于成型；另一方面，在折弯过程中，凹槽5111a的口部附近的电极活性材料所受到的挤压应力较小或者不会受到挤压应力，使得第一层叠段512受到折弯阻力变小，从而更容易更准确地弯折到预定位置。在本实施例中，第一极片51还具有设置于折弯段511的薄弱区5110，沿第一极片51的厚度方向H，薄弱区5110与凹槽5111a相对应设置。第一极片51在薄弱区5110的厚度小于第一极片51除薄弱区5110之外区域的厚度。此时，因为薄弱区5110的刚度小于第一极片51除薄弱区5110之外区域的刚度，故折弯段511更容易在薄弱区5110折弯，从而有利于相邻两个第一层叠段512的位于同侧的第一外边缘5121一致。
在图5和图6所示实施例中，在第一极片51的延伸方向W上，薄弱区5110的厚度从中心区域至两侧区域呈增大趋势。沿第一方向X，凹槽 5111a延伸至折弯段511相对的两个第二外边缘5112以贯穿整个折弯段511，相比于凹槽5111a不贯穿整个折弯段511的情形，从而在折弯过程中，凹槽5111a附近的电极活性材料所受到的挤压应力较小或者不会受到挤压应力，使得第一层叠段512受到折弯阻力变小，从而可以更好地保证折弯段511的折弯位置的准确性，进而保证第一层叠段512更容易更准确地弯折到预定位置。在本实施中，折弯段511具有部分电极活性材料层51b。两层电极活性材料层51b其中一层与薄弱区5110对应的部分未被完全去除，另一层可被完全去除，也可不被完全去除。本实施例中，沿第一极片51的延伸方向W，凹槽5111a的开口尺寸小于折弯段511的尺寸，从而使得折弯段511上除引导部5111之外的其它区域被电极活性材料层51b覆盖。在一个示例中，两层电极活性材料层51b与薄弱区5110所对应的部分均被完全去除。
引导部5111在第一方向X上的尺寸根据折弯段511在该第一方向X上的尺寸设置。引导部5111在第一方向X上的尺寸也即引导部5111的长度。折弯段511在该第一方向X上的尺寸也即折弯段511的长度。因此，在其它一些实施例中，凹槽5111a沿第一方向X不贯穿折弯段511。该凹槽5111a在第一方向X上的尺寸与折弯段511在第一方向X上的尺寸的比值为0.4至0.8，优选为0.4、0.5、0.6、0.7或0.8。
图7示意性地显示了图5所示实施例的第一极片51的多次往复折叠状态的结构。在电极组件50加工制造过程中，需要对第一极片51进行折弯。在生产时，引导部5111可以引导折弯段511进行折弯，也就是说，折弯段511可以沿着引导部5111进行弯折，从而可以使得折弯位置位于预定位置，有利于保证相邻两个第一层叠段512的第一外边缘5121一致。第一极片51的折弯段511沿图7中所示的弯折方向Z弯折。弯折方向Z与第一方向X相互垂直，也即弯折方向Z所在平面和第一方向X相互垂直。本实施例中，第一极片51可以大致呈Z字形往复折弯。图7中所示的虚线并不表示实体结构，而是示意性地显示折弯段511和第一层叠段512两者的分隔线。由于相邻两个凹槽5111a位于第一极片51的两个相对表面，并且凹槽5111a位于折弯段511弯折时承受压应力的一侧，因此在 第一极片51折叠完成后，折弯段511上的凹槽5111a的开口朝向相邻两个第一层叠段512之间形成的空间，也即凹槽5111a位于折弯段511的内侧表面，从而薄弱区5110靠近凹槽5111a的一侧不承载拉伸应力，降低薄弱区5110在拉伸应力作用下发生断裂的可能性。在第一极片51折叠完成后，相邻两个第一层叠段512沿第二方向Y间隔层叠设置，并且相邻两个第一层叠段512之间形成的空间用于容纳第二极片52的第二层叠段521。第二方向Y与第一层叠段512的层叠方向相同并且与第一方向X相互垂直。本实施例中，折弯后的折弯段511呈弧形，例如可以是圆弧形。
图8所示实施例中，以第一极片51为基础，在第一极片51的厚度方向H上，第一极片51的相对两侧分别设置隔离膜53。两个隔离膜53成对设置，而第一极片51设置于两个隔离膜53之间。隔离膜53覆盖第一层叠段512和折弯段511。沿图5所示的第一方向X，至少部分极耳50b超出隔离膜53的边缘。在生产过程中，通过相应送料设备，分别将两个隔离膜53贴附在第一极片51上。在隔离膜53远离第一极片51的一侧设置第二极片52。第一极片51和第二极片52的极性相反，其中一者为阴极片时，另一者为阳极片。第二极片52包括多个第二层叠段521。本实施例中，相邻的两个第二层叠段521分别设置于第一极片51的相对两侧。沿厚度方向H，第一层叠段512和第二层叠段521彼此位置相对应设置。本实施例中，相邻两个折弯段511之间设置一个第二层叠段521。但本申请并不限定相邻两个折弯段511之间设置一个第二层叠段521，也可以根据产品要求设置相适配数量的第二层叠段521。在一个示例中，在第一极片51上设置好隔离膜53后，将第二层叠段521附接于隔离膜53上。例如，第二层叠段521和隔离膜53可以通过热压、电泳或粘接方式连接。隔离膜53是介于第一极片51和第二极片52之间的绝缘体。隔离膜53的材料可以为塑料等绝缘材料，以绝缘隔离第一极片51和第二极片52。
图9示意性地显示了一种实施例的电极组件50的侧视结构。在第一极片51、隔离膜53以及第二极片52按照图8所示方式组合后，将折弯段511在引导部5111的引导下进行折弯，最后形成图9所示的折叠状态。在第二方向Y上，相邻两个第一层叠段512之间设置一个第二层叠段521， 以使第一层叠段512和第二层叠段521依次交替设置。在第二方向Y上，折弯段511和第二层叠段521彼此不存在重叠区域。在本实施例中，折弯段511完全处于弯折状态，折弯段511的起始线为相对于第一层叠段512开始弯折的区域。折弯段511与第二层叠段521之间具有间隙，此时第一层叠段512沿延伸方向W的两个边缘均超出第二层叠段521，而第二层叠段521沿延伸方向W朝向折弯段511的端部不与折弯段511接触，从而降低第二层叠段521的端部因与折弯段511干涉而出现电极活性材料掉粉或脱落的可能性。在第一极片51折弯后，各个折弯段511上的凹槽5111a位于折弯段511的内侧表面，即在第一极片51折弯后，各个折弯段511上的凹槽5111a均位于集流体51a靠近第二层叠段521的一侧。这里，内侧表面指的是折弯段511靠近第二层叠段521的表面。相应地，折弯段511的外侧表面指的是折弯段511远离第二层叠段521的表面。本实施例中，弯折后的折弯段511上的引导部5111与第二层叠段521的中间区域对应设置。
图10示意性地显示了第一层叠段512和第二层叠段521互相层叠后的一种俯视结构。本实施例中，第一极片51为阳极片，而第二极片52为阴极片。在折弯段511上的引导部5111的引导作用下，第一极片51往复折叠后，第一层叠段512的周向边缘均超出第二层叠段521，从而保证第二层叠段521整体被第一层叠段512覆盖，有效降低因第二层叠段521超出第一层叠段512而导致出现析锂现象的可能性。这里，第二层叠段521整体被第一层叠段512覆盖指的是第二层叠段521在第二方向Y上的正投影完全位于第一层叠段512在第二方向Y上的正投影内，此时第二层叠段521的投影面积小于第一层叠段512的投影面积。在一个示例中，第一层叠段512的第一外边缘5121与相对应的第二层叠段521的第三外边缘5211之间的间距大于等于0.2毫米并且小于等于5毫米，优选为0.5毫米、1毫米、1.5毫米、2毫米、2.5毫米、3毫米、3.5毫米、4毫米或4.5毫米。由于折弯段511设置引导部5111，因此第一极片51在引导部5111的引导作用下折弯，以使与折弯段511相连接的两个相邻的第一层叠段512各自的第一外边缘5121一致，也即两个相邻的第一层叠段512位 于同侧的两个第一外边缘5121具有夹角α。这里，两个相邻的第一层叠段512各自第一外边缘5121一致包括图10所示出的状态，即沿第二方向Y，相邻两个第一层叠段512的投影彼此重合。两个相邻的第一层叠段512位于同侧的两个第一外边缘5121的夹角α为0°，从而俯视状态下，两个相邻的第一层叠段512各自第一外边缘5121相互对齐而保持一致。两个相邻的第一层叠段512各自第一外边缘5121一致也包括图11所示出的状态。图11示意性地显示了第一层叠段512和第二层叠段521互相层叠后的另一种俯视结构。两个相邻的第一层叠段512在俯视状态下位于同侧的两个第一外边缘5121不是完全对齐状态。两个相邻的第一层叠段512位于同侧的两个第一外边缘5121存在夹角α。夹角α大于0°并且小于等于30°，以保证第一层叠段512覆盖第二层叠段521。优选地，夹角α的取值为5°、10°、15°、20°或25°。这里，夹角α为允许误差角度。在折弯后的第一层叠段512的第一外边缘5121出现偏移而导致未能与另一个第一层叠段512的第一外边缘5121重合，但是仍然能够保证第一层叠段512覆盖第二层叠段521时，两个相邻的第一层叠段512位于同侧的两个第一外边缘5121存在的夹角α被称为允许误差角度。
本申请实施例的第一极片51，由于在折弯段511设置有引导部5111，因此在电极组件50的生产过程中，对第一极片51进行折弯操作时，第一极片51在引导部5111的引导作用下，更加容易在折弯段511的引导部5111区域折弯，从而可以通过设置引导部5111提高折弯段511折弯位置的可控性和准确性，进而提高两个相邻的第一层叠段512的第一外边缘5121一致性，降低第一极片51折弯后因折弯位置存在随机性而导致第一层叠段512和第二层叠段521存在其中作为负极的一者无法将作为正极的另一者完全覆盖的可能性，以此降低加工制造的电极组件50出现析锂现象的可能性。另外，涂覆于集流体51a上的电极活性材料层51b自身具有一定脆性。在折弯段511弯折过程中电极活性材料层51b会受到外力作用，从而电极活性材料层51b会存在从集流体51a上脱落或掉粉的情况，影响电极组件50的电化学性能和安全性能。本申请的凹槽5111a通过减少相对应的电极活性材料的方式形成，从而在折弯段511折弯过程 中，设置的凹槽5111a有利于减小相对应的电极活性材料层51b所承载的内部应力，从而降低电极活性材料层51b出现脱落或掉粉的可能性。
在其它一些实施例中，与图7和图9所示实施例相同的结构在此不在赘述，这里主要描述与图7和图9所示实施例的不同之处。本实施例中，相邻两个折弯段511中，一者的凹槽5111a位于第一极片51的一个表面，另一者的凹槽5111a位于第一极片51的另一个表面，因此折弯后的第一极片51，折弯段511上的引导部5111背向相邻两个第一层叠段512之间形成的空间，也即位于折弯段511的外侧表面，从而凹槽5111a位于折弯段511弯折时承受拉应力的一侧。
在其它一些实施例中，与图9所示实施例相同的结构在此不在赘述，这里主要描述与图9所示实施例的不同之处。本实施例中，每个折弯段511设置一个引导部5111。相邻两个折弯段511上的各自引导部5111的凹槽5111a位于第一极片51的同一个表面，因此折弯后的第一极片51中，相邻两个折弯段511中的一个折弯段511上的凹槽5111a位于折弯段511的外侧表面从而背向相邻两个第一层叠段512之间形成的空间，另一个折弯段511上的凹槽5111a位于折弯段511的内侧表面从而朝向相邻两个第一层叠段512之间形成的空间。本实施例中，在加工制造第一极片51时，只需要在第一极片51的同一个表面加工各个凹槽5111a，有利于降低第一极片51的加工难度。
图12示意性地显示了本申请的另一种实施例的电极组件50的侧视结构。图12所示在其它一些实施例中，与图9所示实施例相同的结构在此不在赘述，这里主要描述与图9所示实施例的不同之处。本实施例中，每个折弯段511对应设置一个引导部5111。一个引导部5111包括两个凹槽5111a。在第一极片51处于展开状态时，两个凹槽5111a沿第一极片51的厚度方向H相对应设置。折弯后的第一极片51中，两个凹槽5111a中的一者设置于折弯段511的外侧表面从而背向相邻两个第一层叠段512之间形成的空间，另一者设置于折弯段511的内侧表面从而朝向相邻两个第一层叠段512之间形成的空间。本实施例中，对于每个折弯段511，在厚度方向H上设置两个凹槽5111a，此时薄弱区5110的厚度更小，从而有利 于进一步降低薄弱区5110的刚度。这样，由于对应于两个凹槽5111a的薄弱区5110刚度较小，因此折弯段511在设置的薄弱区5110区域更加容易发生折弯，有利于进一步提高折弯位置的可控性和准确性。这样，相对于未设置凹槽5111a的折弯段511，本实施例中的两侧的电极活性材料层51b在被折弯时自身内部应力会相对变小，进而有利于进一步降低折弯难度以及电极活性材料层51b因受拉伸或挤压应力而从集流体51a上脱落或掉粉的可能性。在一个示例中，两个凹槽5111a的结构相同。
在其它一些实施例中，与图9所示实施例相同的结构在此不在赘述，这里主要描述与图9所示实施例的不同之处。本实施例中，引导部5111包括一个凹槽5111a。凹槽5111a从折弯段511的内侧表面朝集流体51a延伸。凹槽5111a的开口朝向第二层叠段521。凹槽5111a沿第一极片51的厚度方向H贯穿内侧的电极活性材料层51b以及部分的集流体51a。在一个示例中，采用金属刀具、激光刀具和液体蚀刻器具的至少一者形成凹槽5111a。因此，本实施例中，允许凹槽5111a的一部分开设至集流体51a，从而在保证去除相对应区域的电极活性材料的同时也降低了加工精度要求以及加工难度。另外，由于集流体51a的一部分被去除而形成凹槽5111a的一部分，从而有利于进一步降低与凹槽5111a相对应设置的薄弱区5110的刚度，使得折弯段511在引导部5111更加易于折弯。在其他实施例中，凹槽5111a从折弯段511背向第二层叠段521的外侧表面朝集流体51a延伸。凹槽5111a的开口位于折弯段511的外侧表面，从而凹槽5111a的开口背向第二层叠段521。凹槽5111a沿第一极片51的厚度方向H贯穿外侧的电极活性材料层51b以及部分的集流体51a。
图13示意性地显示了本申请的另一种实施例的第一极片51的多次往复折叠状态的结构。图14示意性地显示了本申请的另一种实施例的电极组件50的侧视结构。图14所示实施例中的第一极片51为图13所示实施例的第一极片51。图13和图14所示实施例中，与图9所示实施例相同的结构在此不在赘述，这里主要描述与图9所示实施例的不同之处。本实施例中，引导部5111包括一个凹槽5111a。凹槽5111a从折弯段511的内侧表面朝集流体51a凹陷并延伸。凹槽5111a的开口朝向第二层叠段521。 凹槽5111a沿第一极片51的厚度方向H贯穿内侧的电极活性材料层51b，并且沿第一极片51的延伸方向W，凹槽5111a的尺寸等于折弯段511的尺寸。内侧的电极活性材料层51b上与折弯段511相对应的部分被全部去除，以使集流体51a上朝向第二层叠段521的表面被暴露。外侧的电极活性材料层51b上与折弯段511相对应的部分未被去除而是全部保留。由于折弯段511上内侧的电极活性材料层51b被全部去除，因此进一步降低折弯段511的刚度，使得折弯段511易于在引导部5111折弯，并且也有效避免折弯段511折弯后内侧电极活性材料层51b发生脱落或掉粉的情况。在其它一些实施例中，外侧的电极活性材料层51b上与折弯段511相对应的部分可以被部分地去除，以在外侧的电极活性材料层51b上也形成引导部5111。
在其它一些实施例中，与图14所示实施例相同的结构在此不在赘述，这里主要描述与图14所示实施例的不同之处。本实施例中，引导部5111包括一个凹槽5111a。凹槽5111a从折弯段511的外侧表面朝集流体51a延伸。凹槽5111a的开口背向第二层叠段521。凹槽5111a沿第一极片51的厚度方向H贯穿外侧的电极活性材料层51b，并且沿第一极片51的延伸方向W，凹槽5111a的尺寸等于折弯段511的尺寸。外侧的电极活性材料层51b上与折弯段511相对应的部分被全部去除，以使集流体51a上背向第二层叠段521的表面被暴露。内侧的电极活性材料层51b上与折弯段511相对应的部分未被去除而是全部保留。在其它一些实施例中，内侧的电极活性材料层51b上与折弯段511相对应的部分也可以被部分地去除，以在内侧的电极活性材料层51b上形成凹槽5111a。由于折弯段511上外侧的电极活性材料层51b被全部去除，因此进一步降低折弯段511的刚度，使得折弯段511易于在引导部5111折弯，并且也有效避免折弯段511折弯后外侧电极活性材料层51b发生脱落或掉粉的情况。
图15示意性地显示了本申请的另一种实施例的第一极片51的多次往复折叠状态的结构。图15所示实施例中，与图7所示实施例相同的结构在此不在赘述，这里主要描述与图7所示实施例的不同之处。本实施例中，引导部5111包括两个以上的凹槽5111a。沿第一方向X，两个以上的 凹槽5111a间隔设置。本实施例中，在第一极片51处于展开状态下，沿第一极片51的厚度方向H，薄弱区5110与凹槽5111a相对应设置。薄弱区5110的数量和位置与凹槽5111a的数量和位置一一对应设置。本实施例中，凹槽5111a在垂直于第一方向X的平面投影可以为三角形。但凹槽5111a的投影并不限于三角形，也可以是梯形或矩形等。各个凹槽5111a从折弯段511的外侧表面朝集流体51a延伸，从而凹槽5111a的开口背向第二层叠段521。各个凹槽5111a在第一方向X的尺寸之和与折弯段511在第一方向X上的尺寸的比值为0.4至0.8，优选为0.4、0.5、0.6、0.7或0.8。在其它一些实施例中，各个凹槽5111a从折弯段511的内侧表面朝集流体51a延伸，从而凹槽5111a的开口朝向第二层叠段521。在其它一些实施例中，在折弯段511的内侧表面和外侧表面分别设置多个凹槽5111a。在一个示例中，在第一极片51处于展开状态下，沿第一极片51的厚度方向H，内侧表面上的凹槽5111a和外侧表面上的凹槽5111a位置相对应。薄弱区5110的位置与内侧表面上的凹槽5111a以及外侧表面的凹槽5111a的位置一一对应设置。内侧表面上的凹槽5111a以及外侧表面的凹槽5111a共同对应设置一个薄弱区5110。
图16示意性地显示了本申请的另一种实施例的第一极片51的多次往复折叠状态的结构。图16所示实施例中，与图7所示实施例相同的结构在此不在赘述，这里主要描述与图7所示实施例的不同之处。本实施例中，引导部5111包括两个以上的穿孔5111b。沿第一方向X，两个以上的穿孔5111b间隔设置。在第一极片51处于展开状态下，沿第一极片51的厚度方向H，穿孔5111b贯穿两层电极活性材料层51b以及集流体51a。在第一极片51展开状态下，穿孔5111b在第一极片51的延伸方向W上的尺寸小于折弯段511在第一极片51的延伸方向W上的尺寸。在一个示例中，穿孔5111b的形状可以为矩形、正方形、椭圆形、梯形或者三角形。本实施例中，各个穿孔5111b在第一方向X的尺寸之和与折弯段511在第一方向X上的尺寸的比值为0.4至0.8，优选为0.6或0.7。
在一个实施例中，引导部5111包括一个穿孔5111b。该穿孔5111b在第一方向X上的尺寸与折弯段511在第一方向X上的尺寸的比值为0.4至 0.8，优选为0.6或0.7。
图17示意性地显示了本申请的另一种实施例的电极组件50的侧视剖视结构。电极组件50中包括的第一极片51为图16所示实施例的第一极片51。本实施例中，弯折后的折弯段511上的穿孔5111b与第二层叠段521的中间区域对应设置。但本申请并不对穿孔5111b的位置进行限定，穿孔5111b的位置也可以与第二层叠段521上沿第二方向Y偏离中间区域的其它区域对应设置。
图18示意性地显示了本申请的另一种实施例的第一极片51的多次往复折叠状态的结构。图18所示实施例中，与图7所示实施例相同的结构在此不在赘述，这里主要描述与图7所示实施例的不同之处。本实施例中，引导部5111包括两个以上的凹槽5111a和两个以上的穿孔5111b。沿第一方向X，相邻两个穿孔5111b之间可以设置一个或两个以上的凹槽5111a。或者，相邻两个凹槽5111a之间可以设置一个或两个以上的穿孔5111b。在其它一些实施例中，可以根据需要，引导部5111可以包括其它数量的凹槽5111a和其它数量的穿孔5111b。在一个示例中，引导部5111可以包括一个凹槽5111a和一个穿孔5111b。如图18所示，相邻两个折弯段511中，在一个折弯段511上，各个凹槽5111a从折弯段511的外侧表面朝集流体51a延伸，从而凹槽5111a的开口背向第二层叠段521；在另一个折弯段511上，各个凹槽5111a从折弯段511的内侧表面朝集流体51a延伸，从而凹槽5111a的开口朝向第二层叠段521。可以理解地，在其他实施例中，每个折弯段511上的各个凹槽5111a从折弯段511的外侧表面朝集流体51a延伸，从而凹槽5111a的开口背向第二层叠段521。或者，每个折弯段511上的各个凹槽5111a从折弯段511的外侧表面朝集流体51a延伸，从而凹槽5111a的开口朝向第二层叠段521。
图19示意性地显示了本申请的另一种实施例的电极组件50的侧视结构。图19所示实施例中，与图9所示实施例相同的结构在此不在赘述，这里主要描述与图9所示实施例的不同之处。本实施例中，折弯段511包括两个连接部511a以及连接两个连接部511a的中间过渡部511b。中间过渡部511b与连接部511a大致呈垂直状态，并且中间过渡部511b与第一 层叠段512大致呈垂直状态。折弯段511的两个连接部511a分别连接于两个相邻的第一层叠段512。如图19所示，连接部511a与第一层叠段512相齐平。每个折弯段511设置两个引导部5111。在第一极片51处于展开状态时，两个引导部5111沿第一极片51的延伸方向W间隔设置。每个引导部5111的一部分位于连接部511a，另一部分位于中间过渡部511b。本实施例中，两个引导部5111均设置于折弯段511的内侧表面。中间过渡部511b的内侧具有部分电极活性材料层51b。本实施例中，在第一极片51进行折弯操作时，易于在两个引导部5111相对应的位置进行折弯，从而进一步提高折弯位置的可控性和准确性，进一步保证两个相邻的第一层叠段512的第一外边缘5121一致。
图20示意性地显示了本申请的另一种实施例的电极组件50的侧视结构。图20所示实施例中，与图9所示实施例相同的结构在此不在赘述，这里主要描述与图9所示实施例的不同之处。本实施例中，隔离膜53延伸超过第一极片51，并且隔离膜53超过第一极片51的部分环绕包覆第一极片51和第二极片52，从而隔离膜53直接对第一极片51和第二极片52形成绝缘防护，减少后续对完成折叠的第一极片51和第二极片52再次进行绝缘封装的工序。
本申请实施例的电极组件50包括第一极片51、第二极片52以及隔离膜53。第一极片51具有交替设置的第一层叠段512和折弯段511。折弯段511具有引导部5111。在电极组件50生产过程中，需要在第一极片51上依次设置隔离膜53以及第二极片52，然后通过多次往复折弯第一极片51，以使第一层叠段512和第二极片52的第二层叠段521相互层叠。折弯段511的引导部5111能够在第一极片51折弯过程中引导第一极片51在折弯段511的预定位置进行折弯，从而提高第一极片51折弯位置的可控性和准确性，进而保证第一层叠段512的第一外边缘5121一致，使得第一层叠段512与第二层叠段521中作为阴极片的一者能够覆盖作为阳极片的另一者。这样，本申请实施例的电极组件50，在第一极片51和第二极片52之间出现析锂现象的可能性较低，保证应用电极组件50的二次电池具有良好的电化学性能和安全性能。
本申请实施例还提供一种电极组件50成型方法，其包括：
提供第一极片51，第一极片51包括多个折弯段511和多个第一层叠段512，每个折弯段511用于连接两个相邻的第一层叠段512，其中，折弯段511具有引导部5111；
提供与第一极片51极性相反的第二极片52，第二极片52包括多个第二层叠段521，每个第二层叠段521设置于相邻两个第一层叠段512之间；
沿引导部5111折弯折弯段511，以使与折弯段511相连接的两个相邻第一层叠段512的第一外边缘5121一致。
本申请实施例的电极组件50的成型方法可以用于制造上述各实施例的电极组件50。
在一个实施例中，成型方法还包括通过金属刀具、激光刀具以及液体刻蚀器具中的至少一者形成引导部5111的步骤。在一个示例中，本步骤中，通过机械切割方式、激光切割方式、水流冲蚀或者通过化学反应等方式去除折弯段511上预定位置的电极活性材料层51b，以在第一极片51上形成引导部5111。
在一个实施例中，在提供与第一极片51极性相反的第二极片52的步骤之前，向具有引导部5111的第一极片51提供成对设置的隔离膜53，并使得成对设置的隔离膜53位于第一极片51的相对两侧。
本申请的电极组件50的成型方法，在电极组件50生产过程中，将第一极片51沿折弯段511的引导部5111折弯。折弯段511的引导部5111能够在第一极片51折弯过程中引导第一极片51在折弯段511的预定位置进行折弯，从而提高第一极片51折弯位置的可控性和准确性，以使与折弯段511相连接的两个相邻第一层叠段512的第一外边缘5121一致，并且第一层叠段512与第二层叠段521中作为阴极片的一者覆盖作为阳极片的另一者。这样，采用本申请实施例的电极组件50的成型方法制造的电极组件50，在第一极片51和第二极片52之间出现析锂现象的可能性较低，保证应用电极组件50的二次电池具有良好的电化学性能和安全性能。
本申请实施例中，电极组件50可以是第一极片51、隔离膜53和第二极片52叠置形成的叠片电芯。第一极片51包括多个折弯段511和多个第一层叠段512，其中，折弯段511在被折弯后至少部分处于弯折状态。第一极片51整体为连续延伸结构。沿第一极片51自身的延伸方向W，折弯段511和第一层叠段512交替设置。第二极片52包括多个第二层叠段521，每个第二层叠段521设置于相邻两个第一层叠段512之间。在以下实施例中，示例性地以第一极片51为阳极片，第二极片52为阴极片进行说明。同样地，在其他的实施例中，第一极片51可以为阴极片，而第二极片52为阳极片。引导部5111可以是在第一极片51上形成的痕迹。
为了更好地理解本申请，下面结合图21至图32根据本申请实施例的叠片电芯生产系统以及叠片电芯成型方法进行详细描述。
本申请实施例提供一种叠片电芯生产系统，包括
第一输送机构100，提供阳极片，阳极片包括多个折弯段511和多个第一层叠段512，每个折弯段511用于连接两个相邻的第一层叠段512；
制痕机构300，制痕机构300用于在折弯段511上设置痕迹，痕迹用于在生产时引导折弯段511折弯；
第二输送机构400，提供与阳极片极性相反的阴极片，阴极片包括多个第二层叠段521，每个第二层叠段521设置于相邻两个第一层叠段512之间；
叠片机构600，叠片机构600用于将折弯段511沿痕迹折弯，并且使与折弯段511相连接的两个相邻第一层叠段512层叠。
在一个实施例中，请参阅图21，本申请实施例提供的叠片电芯生产系统，包括第一输送机构100、隔离膜输送机构200、制痕机构300、第二输送机构400、复合机构500以及叠片机构600。第一输送机构100用于提供阳极片。隔离膜输送机构200设置于第一输送机构100的下游并用于提供成对设置的隔离膜53，成对设置的隔离膜53用于夹持阳极片。制痕机构300设置隔离膜输送机构200的上游，一些可选的示例中，制痕机构300可以位于第一输送机构100与隔离膜输送机构200之间，制痕机构300用于在阳极片上设置痕迹。第二输送机构400设置于隔离膜输送机构 200的下游并用于向隔离膜53提供多个阴极片。复合机构500设置于第二输送机构400的下游并用于将阳极片、隔离膜53以及阴极片复合形成待叠片组。叠片机构600设置于复合机构500下游，叠片机构600用于将待叠片组沿痕迹往复叠置，以成型叠片电芯。
需要说明的是，本申请以上以及以下所提及的“上游”以及“下游”指的是叠片电芯生产顺序的先后，并非限定各部件之间的空间位置。
同时，本申请以上以及以下所提及的痕迹是指事物留下的印痕或印迹。如：折痕等，可选地，其可以是指通过材料去除部件在阳极片上去除部分材料后，材料被去除部分所形成的结构。
本申请实施例提供的叠片电芯生产系统，能够满足叠片电芯的生产需求，同时还能够降低叠片电芯的安全隐患。
请一并参阅图22，可选地，第一输送机构100可以包括第一放卷装置101、第一接带装置102、第一张力平衡装置103以及第一纠偏装置104。第一纠偏装置104设置于第一放卷装置101的下游，第一接带装置102以及第一张力平衡装置103均位于第一放卷装置101以及第一纠偏装置104之间。
第一放卷装置101可以包括第一放卷辊以及驱动第一放卷辊做回转运动的驱动部件，阳极片缠绕在第一放卷辊上，通过第一放卷辊的转动实现对阳极片的释放。
可选地，第一接带装置102可以设置于第一放卷装置101的下游，当阳极片放卷完成时，可以用此机构进行接带，以保证连续生产。
可选地，第一纠偏装置104位于制痕机构300的上游，可以通过检测装置实时监测或者按照一定时间间隔监测阳极片是否在制痕机构300预定的范围内，若不在，需要对阳极片的位置进行调整，进而确保阳极片始终在制痕机构300的制痕范围内。
可选地，第一张力平衡装置103可以位于第一接带装置102的下游，当第一放卷装置101和用于给阳极片提供运行动力的驱动电机不同步时，可以通过第一张力平衡装置103进行调节，让阳极片张力保持在一定范围内。
请一并参阅图23以及图25，在一些可选的实施例中，制痕机构300包括间隔设置的第一制痕部件301以及第二制痕部件302，在阳极片的厚度方向H，第一制痕部件301用于在阳极片的其中一个表面设置痕迹，第二制痕部件302用于在阳极片的另一个表面设置痕迹。通过上述设置，使得制痕机构300在工作时，能够在阳极片的厚度方向H上的两个表面交替设置痕迹，使得最终叠片时阳极片能顺利地沿着阳极片两个表面上的痕迹进行折叠。痕迹与最终的折叠痕方向一致，更利于叠片机构600按照痕迹往复叠置待叠片组。
作为一种可选的实施方式，第一制痕部件301为金属刀具、激光刀具以及液体刻蚀器具中的一者，上述形式的第一制痕部件301能够实现通过机械切割方式、激光切割方式、水流冲蚀或者通过化学反应等方式去除预定位置的材料，以在阳极片的厚度方向H的一个表面形成痕迹。操作工艺简单，且易于痕迹的形成。
在一些可选的示例中，同样的，上述各实施例的叠片电芯生产系统，其第二制痕部件302为金属刀具、激光刀具以及液体刻蚀器具中的一者，上述形式的第二制痕部件302能够实现通过机械切割方式、激光切割方式、水流冲蚀或者通过化学反应等方式去除预定位置的材料，以在阳极片的厚度方向H的另一个表面形成痕迹。操作工艺简单，且易于痕迹的形成。
作为一种可选的实施方式，在制痕机构300的下游设置有第一除尘装置105，第一除尘装置105位于制痕机构300以及隔离膜输送机构200之间，第一除尘装置105包括用于阳极片的正面和/或反面进行除尘，以达到清洁阳极片的目的。第一除尘装置105可以包括毛刷以及吸尘部件，在阳极片运行的过程中能够通过毛刷将粉尘剥离并通过吸尘部件将由阳极片上剥离的粉尘抽吸并回收，保证阳极片在夹持于隔离膜53时的清洁度，进而优化叠置形成的叠片电芯的电学性能。
在一些可选的实施例中，隔离膜输送机构200进一步可以位于制痕机构300的第二制痕部件302的下游，隔离膜输送机构200包括成对设置的隔离膜输送装置，同一对的两个隔离膜输送装置可以相对设置。每个隔离 膜输送装置包括隔离膜放卷辊21以及驱动隔离膜放卷辊做回转运动的驱动部件，隔离膜53缠绕在隔离膜放卷辊上，通过隔离膜放卷辊的转动实现对隔离膜53的释放，通过引导轮可以将相应的隔离膜53引导至预定位置以将具有痕迹的阳极片夹持。
请一并参阅图25，在一些可选的实施例中，第二输送机构400可以包括第二放卷装置401、第二接带装置402、第二张力平衡装置403、第二纠偏装置404、裁切装置405以及第二除尘装置406。
可选的，第二放卷装置401可以包括第二放卷辊以及驱动第二放卷辊做回转运动的驱动部件，阴极片缠绕在第二放卷辊上，通过第二放卷辊的转动实现对阴极片的释放。
可选的，第二接带装置402可以设置于第二放卷装置401的下游，当阴极片放卷完成时，可以用此机构进行接带，以保证连续生产。
可选的，第二张力平衡装置403位于第二接带装置402的下游，当第二放卷装置401和用于给阴极片提供运行动力的驱动电机不同步时，可以通过第二张力平衡装置403进行调节，让阴极片张力保持在一定范围内。可选的，第二纠偏装置404位于第二张力平衡装置403的下游，可以通过检测装置实时监测或者按照一定时间间隔监测阴极片是否在第二纠偏装置404预定的范围内，若不在，需要对阴极片的位置进行调整，进而确保阴极片始终在裁切机构45的裁切范围内。
可选的，裁切装置405设置于第二纠偏装置404的下游，用于将带状的阴极片切割呈多个预定大小的块状结构。
可选的，第二除尘装置406位于裁切装置405的下游，用于接收块状的阴极片并对阴极片进行除尘，保证连接至隔离膜53的阴极片的清洁度。第二除尘装置406可以包括皮带刷4061以及吸尘装置4062，裁切装置405裁切的阴极片落至第二除尘装置406的皮带刷4061，通过皮带刷4061能够将阴极片运送至复合机构500所在方向并连接于隔离膜53。且在运送的过程中，通过皮带刷4061还能够将阴极片上的粉尘剥离并通过吸尘装置4062抽吸并回收，保证连接于隔离膜53上的阴极片的清洁度，进而使得生产的叠片电芯能够更好的满足其电性要求。
在具体实施时，可以根据需求，将第二输送机构400成对设置，成对设置的第二输送机构400可以相对并同步或者交替向同一隔离膜53或者不同隔离膜53提供阴极片。
请一并参阅图26至图28，可选的，上述各实施例提供的叠片电芯生产系统，其复合机构500可以包括加热传输组件501以及辊压部件502，加热传输组件501用于加热并输送隔离膜53以及阴极片，辊压部件502设置于加热传输组件501的下游并用于辊压被加热后的隔离膜53以及阴极片，以使二者复合连接。复合机构500采用上述结构形式，结构简单，且能够保证阴极片与夹持有阳极片的隔离膜53之间的复合效果。
作为一种可选的实施方式，加热传输组件501包括加热部件5011以及输送部件5012。加热部件5011用于加热隔离膜53以及阴极片。输送部件5012包括传动轮5012a以及与传动轮5012a配合的传动带5012b，传动带5012b环绕加热部件5011设置并用于输送隔离膜53以及阴极片。
由于阴极片片携带有PVDF粘结剂，而对应隔离膜53也附带有PVDF粘结剂，双方的粘结剂通过加热后挤压，可以使其更好的粘结在一起。
因此，加热传输组件501采用上述结构，既能够满足加热粘接要求，同时，限制输送部件5012包括传动轮5012a以及与传动轮5012a配合的传动带5012b，通过限制传动带5012b与加热部件5011之间的关系，在满足加热需求的基础上，还能够通过传动带5012b对位于隔离膜53表面的阴极片进行防护以及运输，使得阴极片能够与隔离膜53同步运动，保证二者相对位置的稳定性，进而保证阴极片与隔离膜53之间的复合要求。
并且，本申请实施例提供的叠片电芯生产系统，其加热传输组件501采用上述结构形式，使得阴极片经加热部件5011充分加热后，通过辊压部件502使阴极片和隔离膜53连接在一起，达到待叠片组的制作目的。与传统的复合机构500对比，加热传输组件501采用传动带替代一次性使用的PET膜，通过取消PET膜，进而省去了PET膜放卷和收卷的时间，能够提高设备的使用率并降低生产制造成本。
在一些可选的实施例中，加热部件5011可以采用烘箱、换热器等能够提供热能的部件，以完成至少对阴极片以及隔离膜53的加热。
在一些可选的实施例中，当加热部件5011采用烘箱结构时，烘箱可以由金属板制成且内部均匀放置多根发热管，通过发热管的加热，使热烘箱达到设定的温度，当阴极片通过烘箱时，烘箱的温度通过热辐射的方式使阴极片以及隔离膜53达到一定的温度。
可选的，传动带5012b可以为皮带，其数量可以根据阴极片的尺寸设置，在一些可选的实施例中，传动带5012b的数量可以为两个以上，两个以上传动带5012b彼此间隔设置并共同输送阴极片以及隔离膜53，以保证阴极片受力的稳定性，进而能够保证阴极片能够随隔离膜53同步且平稳的运行。
作为一种可选的实施例方式，加热传输组件501的数量为两个以上，每两个加热传输组件501为一组且相对设置，同一组的两个加热传输组件501通过相对设置的传动带5012b共同夹持并输送阴极片以及隔离膜53。
通过将加热传输组件501成对设置，并使得成对设置的加热传输组件501共同夹持并作用于阴极片以及隔离膜53，能够保证两个隔离膜53上的阴极片能够与各自对应的隔离膜53同步运行，进而更好的保证各阴极片与隔离膜53相对位置的稳定性，使得在辊压部件502之前，阴极片在隔离膜53上的位置的准确性。
作为一种可选的实施方式，辊压部件502可以包括成对设置的挤压辊5021，通过成对设置的挤压辊5021能够对被加热后阴极片以及隔离膜53进行挤压，进而使得二者复合连接并与阳极片共同形成待叠片组。
作为一种可选的实施方式，辊压部件502和/或传动带5012b上设置有除尘部件503，即，辊压部件502以及传动带5012b的至少一者上设置有除尘部件503，除尘部件503同样可以采用毛刷与吸尘装置的配合方式，以对待叠片组进行除尘，更好的保证叠片电芯的性能。
请一并参阅图29至图31，在一些可选的实施例中，上述各实施例提供的叠片电芯生产系统，其叠片机构600可以包括动力源601以及摆动机构602，摆动机构602具有用于待叠片组穿过的间隙6021，动力源601与摆动机构602连接并驱动摆动机构602沿着预定的轨迹往复摆动，以将待叠片组往复叠置并成型叠片电芯。叠片机构600采用上述结构形式，结构 简单，成本低廉，且能够根据阳极片上的痕迹往复折叠待叠片组，使得成型的叠片电芯具有更好的性能。
作为一种可选的实施方式，摆动机构602包括安装座6022以及成对设置并与安装座6022连接的夹持辊6023，间隙6021形成于成对设置的夹持辊6023之间，摆动机构602通过安装座6022与动力源601连接。摆动机构602采用上述结构形式，能够便于与动力源601连接，更好的满足动力传递，同时还能够满足待叠片组的穿设要求，使其按照预定的痕迹被往复折叠，保证叠片电芯的成组要求。
可选的，动力源601可以采用驱动电机，安装座6022可以包括成对且间隔设置的安装板，夹持辊6023位于两个安装板之间且轴向的端部分别与对应的安装板连接。
在一些可选的实施例中，摆动机构602进一步包括成对设置的限位加强辊6024，限位加强辊6024位于夹持辊6023的上游并与安装座6022连接。通过设置限位加强辊6024，能够使得摆动机构602在运动时，对待叠片组的倾斜角度进行限制，更好的保证待叠片组能够按照相应的痕迹进行往复折叠，进而保证叠片精度。
同时，限位加强辊6024的设置，还能够对安装座6022起到加强作用，避免摆动机构602在沿着预定轨迹摆动时，造成安装座6022与夹持辊6023之间或者成对设置的夹持辊6023之间的相对位置发生变化，同样能够更好的保证叠片电芯的叠片要求。
在一些可选的实施例中，上述各实施例提供的叠片电芯生产系统，进一步包括主输送机构700，主输送机构700位于复合机构500以及叠片机构600之间，主输送机构700用于向待叠片组提供运行动力，以更好的保证待叠片组按照预定速度向叠片机构600运行。上述各实施例中提及的用于给阳极片提供动力的驱动电机可以为主输送机构700。
由此，本申请实施例提供的叠片电芯生产系统，因其包括第一输送机构100、隔离膜输送机构200、制痕机构300、第二输送机构400、复合机构500以及叠片机构600，由于制痕机构300的设置并使其在阳极片上设置痕迹，可以省略对阳极片的切割步骤，避免毛刺的产生，保证叠片电芯 的安全，同时，还可以简化叠片电芯生产系统的结构。
在一个实施例中，请一并参阅图21至图32，本申请实施例还提供一种叠片电芯成型方法，包括：
S100、提供阳极片，在阳极片上设置多个痕迹，多个痕迹在阳极片的延伸方向W间隔分布；
S200、向带有痕迹的阳极片提供成对设置的隔离膜53，并使得成对设置的隔离膜53共同夹持阳极片；
S300、向隔离膜53提供多个阴极片，使得多个阴极片沿着延伸方向W间隔贴敷并连接于隔离膜53远离阳极片的表面，以形成待叠片组，每个阴极片位于相邻两个痕迹之间；
S400、沿多个痕迹所在位置往复叠置待叠片组以形成叠片电芯。
在一些可选的示例中，本申请实施例提供的叠片电芯成型方法可以采用上述各实施例提及的叠片电芯生产系统实施。
在步骤S100中，提供的阳极片是呈连续的带状结构，所述的痕迹为通过材料去除部件在阳极片上去除部分材料后、材料被去除部分所形成的结构，其中，材料去除部件为金属刀具、激光刀具以及液体刻蚀器具中的一者，即，材料去除部件可以为上述各实施例提及的制痕机构300。
在一些可选的示例中，材料去除部件在阳极片上去除部分材料可以是电极活性材料，此时痕迹的深度小于或等于电极活性材料层51b的厚度。材料去除部件在阳极片上去除部分材料也可以是电极活性材料和集流体51a的材料，此时痕迹的深度大于电极活性材料层51b的厚度。
在一些可选的示例中，在步骤S100中，相邻两个痕迹中，其中一个痕迹位于阳极片在自身厚度方向H的一个表面，另一个痕迹位于阳极片在厚度方向H的另一个表面。
当通过上述任意实施例提供的叠片电芯生产系统实施本申请的成型方法时，在步骤S100中，可以通过第一输送机构100提供阳极片，并通过制痕机构300在阳极片上设置相应的痕迹。在步骤S200中，可以通过隔离膜输送机构200提供成对设置的隔离膜53。
在一些可选的实施例中，在步骤S300中，相邻的两个阴极片中，其 中一个连接于成对设置的隔离膜53中的其中一者，另一个连接于成对设置的隔离膜53中的另一者。通过上述设置，使得成型的叠片电芯能够更好的满足使用要求，优化叠片电芯的电学性能。
在一些可选的示例中，阴极片可以由上述任意实施例提供的叠片电芯生产系统中的第二输送机构400提供。
在步骤S400中，可以由上述任意实施例提供的叠片电芯生产系统中的叠片机构600对待叠片组进行叠置，完成叠片电芯的生产要求。
本申请实施例提供的叠片电芯成型方法，能够满足叠片电芯的生产需求，同时还能够降低叠片电芯的安全隐患。
需要说明的是，本申请上述各实施例提供的的叠片电芯生产系统以及叠片电芯成型方法中，在阳极片的厚度方向H上，阳极片上形成痕迹的区域的厚度小于阳极片其他未形成痕迹的区域的厚度。痕迹的设置能够保证阳极片在痕迹所在区域相对其他区域更易被折叠。
可选地，痕迹可以为在阳极片上去除材料后所形成的上述各实施例的凹槽5111a。可选地，凹槽5111a的形状可以为U形槽、三角形槽或者其他形状规则的多边形槽或者形状不规则的异形槽。可选地，痕迹在阳极片的带宽方向贯穿阳极片。阳极片的带宽方向与第一方向X相同，并且带宽方向与其延伸方向W以及厚度方向H均垂直。
可选地，凹槽5111a的数量为两个以上。沿第一方向X，两个以上的凹槽5111a间隔设置。或者凹槽5111a的数量为一个。
可选地，痕迹可以为在阳极片上去除材料后所形成的上述各实施例的穿孔5111b。在第一极片51处于展开状态下，沿第一极片51的厚度方向H，穿孔5111b贯穿两层电极活性材料层51b以及集流体51a。在一个示例中，穿孔5111b的形状可以为矩形、正方形、椭圆形、梯形或者三角形。穿孔5111b的数量为两个以上，沿第一方向X，两个以上的穿孔5111b间隔设置。在一个实施例中，穿孔5111b的数量为一个。
可选地，痕迹可以为在阳极片上去除材料后所形成的上述各实施例的凹槽5111a和穿孔5111b。可选地，穿孔5111b的数量为两个以上，沿第一方向X，相邻两个穿孔5111b之间可以设置一个或两个以上的凹槽 5111a。或者，凹槽5111a的数量为两个以上，相邻两个凹槽5111a之间可以设置一个或两个以上的穿孔5111b。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件，尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (26)

  1. 一种电极组件，用于二次电池，包括：
    第一极片，包括多个折弯段和多个层叠设置的第一层叠段，每个所述折弯段用于连接两个相邻的所述第一层叠段，其中，所述折弯段具有引导部，用于在生产时引导所述折弯段折弯；
    与所述第一极片极性相反的第二极片，所述第二极片包括多个第二层叠段，每个所述第二层叠段设置于相邻两个所述第一层叠段之间。
  2. 根据权利要求1所述的电极组件，其中，所述引导部沿第一方向设置，所述第一方向与所述折弯段的弯折方向垂直。
  3. 根据权利要求1或2所述的电极组件，其中，每个所述第一层叠段具有相对的两个第一外边缘，在生产时引导所述折弯段折弯后，与所述折弯段相连接的两个相邻所述第一层叠段的所述第一外边缘一致。
  4. 根据权利要求2或3所述的电极组件，其中，所述引导部在所述第一方向上的尺寸根据所述折弯段在该方向上的尺寸设置。
  5. 根据权利要求1至4任一项所述的电极组件，其中，所述引导部包括：至少一个凹槽，和/或，至少一个穿孔。
  6. 根据权利要求5所述的电极组件，其中，当所述引导部包含多个凹槽和/或多个穿孔时，所述多个凹槽和/或所述多个穿孔间隔设置。
  7. 根据权利要求2至6任一项所述的电极组件，其中，所述引导部在垂直于所述第一方向的平面投影为三角形、梯形、U形、矩形或V形。
  8. 根据权利要求1至7任一项所述的电极组件，其中，所述第一极片为阳极片，所述第二极片为阴极片。
  9. 一种二次电池，其中，包括如权利要求1至8任一项所述的电极组件。
  10. 一种电池模块，其中，包括如权利要求9所述的二次电池。
  11. 一种装置，其中，包括如权利要求9所述的二次电池，所述二次电池提供电能。
  12. 一种电极组件成型方法，其中，包括：
    提供第一极片，所述第一极片包括多个折弯段和多个第一层叠段，每个所述折弯段用于连接两个相邻的所述第一层叠段，其中，所述折弯段具有引导部；
    提供与所述第一极片极性相反的第二极片，所述第二极片包括多个第二层叠段，每个所述第二层叠段设置于相邻两个所述第一层叠段之间；
    沿所述引导部折弯所述折弯段，以使与所述折弯段相连接的两个相邻所述第一层叠段层叠。
  13. 根据权利要求12所述的成型方法，其中，所述成型方法还包括通过金属刀具、激光刀具以及液体刻蚀器具中的至少一者形成所述引导部的步骤。
  14. 根据权利要求12所述的成型方法，其中，在所述沿所述引导部折弯所述折弯段，以使与所述折弯段相连接的两个相邻所述第一层叠段层叠的步骤中，每个所述第一层叠段具有相对的两个第一外边缘，沿所述引导部折弯所述折弯段，以使与所述折弯段相连接的两个相邻所述第一层叠段的所述第一外边缘一致。
  15. 一种电极组件生产系统，其中，包括：
    第一输送机构，提供第一极片，所述第一极片包括多个折弯段和多个第一层叠段，每个所述折弯段用于连接两个相邻的所述第一层叠段；
    制痕机构，所述制痕机构用于在所述折弯段上设置引导部，所述引导部用于在生产时引导所述折弯段折弯；
    第二输送机构，提供与所述第一极片极性相反的第二极片，所述第二极片包括多个第二层叠段，每个所述第二层叠段设置于相邻两个所述第一层叠段之间；
    叠片机构，所述叠片机构用于将所述折弯段沿所述引导部折弯，并且使与所述折弯段相连接的两个相邻所述第一层叠段层叠。
  16. 根据权利要求15所述的电极组件生产系统，其中，所述制痕机构包括间隔设置的第一制痕部件以及第二制痕部件，所述第一制痕部件用于在所述第一极片的其中一个表面设置所述引导部，所述第二制痕部件用于在所述第一极片的另一个表面设置所述引导部。
  17. 根据权利要求16所述的电极组件生产系统，其中，所述第一制痕部件为金属刀具、激光刀具以及液体刻蚀器具中的一者；和/或，所述第二制痕部件为金属刀具、激光刀具以及液体刻蚀器具中的一者。
  18. 根据权利要求15至17任一项所述的电极组件生产系统，其中，所述电极组件生产系统还包括隔离膜输送机构；
    所述隔离膜输送机构位于所述第一输送机构的下游，并且位于所述第二输送机构的上游，所述隔离膜输送机构用于提供成对设置的隔离膜，成对设置的所述隔离膜用于夹持所述第一极片。
  19. 根据权利要求18所述的电极组件生产系统，其中，所述电极组件生产系统还包括复合机构，用于将所述第一极片、所述隔离膜以及所述第二极片复合形成待叠片组；
    所述复合机构包括：加热传输组件，用于加热并输送所述隔离膜以及所述第二极片；
    辊压部件，设置于所述加热传输组件的下游并用于辊压被加热后的所述隔离膜以及所述第二极片，以使二者复合连接。
  20. 根据权利要求19所述的电极组件生产系统，其中，所述加热传输组件包括：加热部件，用于加热所述隔离膜以及所述第二极片；
    输送部件，包括传动轮以及与所述传动轮配合的传动带，所述传动带环绕所述加热部件设置并用于输送所述隔离膜以及所述第二极片。
  21. 根据权利要求20所述的电极组件生产系统，其中，所述加热传输组件的数量为两个以上，每两个所述加热传输组件为一组且相对设置，同一组的两个所述加热传输组件通过相对设置的所述传动带共同夹持并输送所述第二极片以及所述隔离膜。
  22. 根据权利要求20或21所述的电极组件生产系统，其中，所述辊压部件和/或所述传动带上设置有除尘部件。
  23. 根据权利要求15至22任一项所述的电极组件生产系统，其中，所述叠片机构包括动力源以及摆动机构，所述动力源与所述摆动机构连接并驱动所述摆动机构沿着预定的轨迹往复摆动，以将所述待叠片组往复叠置并成型所述电极组件。
  24. 根据权利要求23所述的电极组件生产系统，其中，所述摆动机构包括安装座以及成对设置并与所述安装座连接的夹持辊，所述摆动机构具有用于所述待叠片组穿过的间隙，所述间隙形成于成对设置的所述夹持辊之间，所述摆动机构通过所述安装座与所述动力源连接。
  25. 根据权利要求24所述的电极组件生产系统，其中，所述摆动机构进一步包括成对设置的限位加强辊，所述限位加强辊位于所述夹持辊的上游并与所述安装座连接。
  26. 根据权利要求19至25任一项所述的电极组件生产系统，其中，所述电极组件生产系统进一步包括主输送机构，所述主输送机构位于所述复合机构以及所述叠片机构之间，所述主输送机构用于向所述待叠片组提供运行动力。
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