WO2023151274A1 - 一种叠片电芯制备方法、装置及叠片电芯 - Google Patents

一种叠片电芯制备方法、装置及叠片电芯 Download PDF

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Publication number
WO2023151274A1
WO2023151274A1 PCT/CN2022/119364 CN2022119364W WO2023151274A1 WO 2023151274 A1 WO2023151274 A1 WO 2023151274A1 CN 2022119364 W CN2022119364 W CN 2022119364W WO 2023151274 A1 WO2023151274 A1 WO 2023151274A1
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Prior art keywords
strip
laminated
positive electrode
diaphragm
negative electrode
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PCT/CN2022/119364
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English (en)
French (fr)
Inventor
唐武斌
刘斌
王春耕
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上海兰钧新能源科技有限公司
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Publication of WO2023151274A1 publication Critical patent/WO2023151274A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with 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
    • H01M10/0404—Machines for assembling 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to the technical field of batteries, in particular, to a method and device for preparing a stacked battery cell, and a stacked battery cell.
  • the continuous positive electrode strip is cut into a positive electrode sheet 10
  • the continuous negative electrode strip is cut into a negative electrode sheet 30 and then compounded with two layers of continuous separator strips 20 .
  • the overall structure obtained by compounding is cut to obtain laminated units 40 , and then a plurality of laminated units 40 are laminated to obtain laminated cells.
  • the disclosure provides a method for preparing a laminated battery cell, a device for preparing a laminated battery cell, and a laminated battery cell, which can prevent the diaphragm from turning over and improve the yield of the laminated battery cell.
  • a method for preparing a laminated battery cell comprising:
  • the secondary composite strip is cut multiple times to obtain a plurality of lamination units
  • a plurality of the laminated units are laminated to obtain a laminated cell.
  • the step of compounding the continuous negative electrode strip between the first diaphragm strip and the second diaphragm strip to obtain a first-level composite strip includes:
  • the plurality of positive electrode sheets are sequentially compounded on the first separator material belt on the first-level composite material belt at a side away from the negative electrode material belt, so as to obtain a second-level composite material belt. Steps include:
  • a plurality of the positive electrode sheets are sequentially placed on the side of the first separator material belt on the first-level composite material belt away from the negative electrode material belt;
  • the step of placing a plurality of the positive electrode sheets at intervals in sequence on the side of the first separator material belt on the primary composite material belt away from the negative electrode material belt includes:
  • the step of laminating a plurality of lamination units to obtain a laminated cell includes:
  • the plurality of laminated units are thrown in sequence, so that the plurality of laminated units are stacked sequentially under the action of inertia and gravity.
  • the step of sequentially throwing a plurality of the lamination units so that the plurality of lamination units are stacked sequentially under the action of inertia and gravity includes:
  • the present disclosure also provides a laminated cell preparation device, including:
  • the first composite assembly is configured to compound the continuous negative electrode strip between the first diaphragm strip and the second diaphragm strip to obtain a first-level composite strip;
  • the first cutting component is configured to cut the positive electrode strip into a plurality of positive electrode sheets
  • the second composite component is configured to sequentially composite a plurality of positive electrode sheets at intervals on the side of the first separator strip away from the negative electrode strip to obtain a secondary composite strip;
  • the second cutting component is configured to use the gap between two adjacent positive electrode sheets as the cutting position to cut the secondary composite strip multiple times to obtain a plurality of lamination units;
  • the laminated assembly is configured to laminate a plurality of laminated units to obtain laminated batteries.
  • the lamination assembly includes a throwing assembly and a tab assembly, the throwing assembly is configured to sequentially throw a plurality of the lamination units, and the tab assembly is configured to move in a vertical direction, To sequentially accept the plurality of lamination units thrown by the throwing assembly, so that the plurality of lamination units are sequentially stacked on the connecting sheet assembly.
  • the throwing assembly includes a driving member and a conveyor belt connected by transmission, the driving member is configured to drive the conveyor belt to move, and the conveyor belt is configured to carry and transport a plurality of the laminated units, so
  • the conveyor belt includes a first input end and a first output end oppositely arranged, and the first input end is higher than the first output end in the vertical direction; wherein, the first input end and the first output end The connection line at the output end is in the same direction as the conveying direction of the conveyor belt.
  • the first input end is higher than the first output end, so that the conveyor belt is inclined at a first angle relative to the horizontal plane, and the first angle is 10 degrees to 25 degrees.
  • the conveyor belt includes a first side and a second side oppositely arranged, a line connecting the first side and the second side is perpendicular to the conveying direction of the conveyor belt, and the second side of the conveyor belt One side is vertically higher than the second side.
  • the first side is vertically higher than the second side, so that the conveyor belt is inclined at a second angle relative to the horizontal plane, and the second angle is 10 degrees to 25 degrees.
  • the laminated unit includes a tab, and when the conveyor belt receives the cut laminated unit, the tab faces the first side of the conveyor belt.
  • the conveyor belt is in grid shape.
  • the tab assembly includes a transmission-connected lifter and a tab platform, the lifter is configured to drive the tab platform to move in the vertical direction, and the tab platform includes a second oppositely arranged an input end and a second output end, wherein the second input end is higher than the second output end in the vertical direction, so as to be inclined at a third angle relative to the horizontal plane in the conveying direction of the throwing assembly;
  • the splicing platform also includes a third side and a fourth side oppositely arranged, the third side is higher than the fourth side in the vertical direction, so as to be inclined relative to the horizontal plane by the third side in the conveying direction perpendicular to the throwing assembly. four angles.
  • a first stop wall is provided at the second output end of the web platform, and a second stop wall is provided at the fourth side of the web platform.
  • the third angle is 10 degrees to 25 degrees; the fourth angle is 10 degrees to 25 degrees.
  • the present disclosure also provides a laminated electric core, including a plurality of laminated units stacked sequentially in the first direction, and the laminated units include a second separator and a negative electrode sheet stacked sequentially in the first direction and combined together 1.
  • the first diaphragm and the positive electrode sheet, the negative electrode sheet is flush with both ends of the first diaphragm and the second diaphragm in the length direction (ie, the conveying direction of the diaphragm material belt).
  • the area of the positive electrode sheet is smaller than the area of the negative electrode sheet.
  • the beneficial effects of the method for preparing laminated batteries provided by the present disclosure include: the separator can be prevented from being rolled up, and the yield of laminated batteries can be improved.
  • Fig. 1 is a schematic structural view of the compounding of the positive electrode sheet, the negative electrode sheet and the separator strip and cutting to form a lamination unit in the prior art;
  • FIG. 2 is a schematic structural diagram of a laminated cell preparation device provided by an embodiment of the present disclosure
  • Fig. 3 is a schematic structural diagram of the application scene of the first composite assembly, the second composite assembly, the first cutting assembly and the second cutting assembly of the laminated cell preparation device provided by the embodiment of the present disclosure;
  • FIG. 4 is a schematic structural view of the composite and cutting of the positive electrode sheet, the negative electrode strip and the diaphragm strip provided by the embodiment of the present disclosure to form a laminated unit;
  • Fig. 5 is a structural schematic diagram of the conveyor belt conveying lamination unit of the laminated cell preparation device provided by an embodiment of the present disclosure
  • Fig. 6 is a structural schematic diagram of a stacking unit receiving a stacking platform of a stacked cell preparation device provided by an embodiment of the present disclosure
  • FIG. 7 is a flowchart of a method for preparing laminated batteries provided by an embodiment of the present disclosure.
  • Fig. 8 is a flow chart diagram of a sub-step of step S101 in Fig. 5;
  • Fig. 9 is a flow chart diagram of a sub-step of step S102 in Fig. 5;
  • Fig. 10 is a flow chart diagram of a sub-step of step S104 in Fig. 5;
  • FIG. 11 is a schematic structural view of a stacked cell provided by an embodiment of the present disclosure.
  • Icons 10-positive electrode sheet; 20-diaphragm strip; 30-negative electrode sheet; 40-laminated cell unit; 100-laminated cell preparation device; 101-negative electrode strip; Second diaphragm material belt; 107-first-level composite material belt; 109-secondary composite material belt; 110-first composite component; 111-first conveying roller group; 112-first preheating module; 113-first composite Roller group; 120-the first cutting assembly; 121-positive material belt; 130-the second composite assembly; 131-the second conveying roller group; 132-the second preheating module; 133-the second composite roller group; 140 - second cutting assembly; 150 - lamination assembly; 151 - throwing assembly; 1511 - conveyor belt; 1512 - drive member; 1513 - first input end; 1514 - first output end; 1515 - first side; -second side; 1517-transverse rib; 152-joint assembly; 1521-joint platform; 1522-first stop wall; 1523-second stop wall
  • connection can be a fixed connection or a Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components.
  • FIG. 2 is a schematic structural view of the laminated cell preparation device 100 provided in this embodiment
  • FIG. 1 A schematic diagram of the application scene structure of a composite assembly 110, a second composite assembly 130, a first cutting assembly 120, and a second cutting assembly 140
  • the laminated cell manufacturing apparatus 100 provided in this embodiment includes a first composite assembly 110 , a first cutting assembly 120 , a second composite assembly 130 , a second cutting assembly 140 and a lamination assembly 150 .
  • the first composite assembly 110 is configured to composite the continuous negative electrode strip 101 between the first separator strip 103 and the second separator strip 105 to obtain a primary composite strip 107 .
  • the first cutting component 120 is configured to cut the positive electrode strip 121 into a plurality of positive electrode sheets 214 .
  • the second composite component 130 is configured to composite a plurality of positive electrode sheets 214 sequentially at intervals on the side of the first separator strip 103 away from the negative electrode strip 101 to obtain a secondary composite strip 109 .
  • the second cutting assembly 140 is configured to use the gap between two adjacent positive electrode sheets 214 as the cutting position to cut the secondary composite strip 109 multiple times to obtain multiple lamination units 210 .
  • the laminated assembly 150 is configured to laminate a plurality of laminated units 210 to obtain laminated cells.
  • the negative electrode strip 101 is a continuous strip when it is combined with the first diaphragm strip 103 and the second diaphragm strip 105, after being cut by the second cutting assembly 140, it can ensure that the negative strip 101, the first strip
  • the cutting edges of the diaphragm material tape 103 and the second diaphragm material tape 105 are aligned, and the first diaphragm material tape 103 and the second diaphragm material tape 105 are combined with the negative electrode material tape 101 respectively, effectively preventing the cutting edge of the diaphragm material tape from rolling over and Short-circuit the positive and negative contacts.
  • the first membrane strip 103 is cut to form the first membrane 213 in the lamination unit 210 ; the second membrane strip 105 is cut to form the second membrane 211 in the lamination unit 210 .
  • the laminated cell preparation device 100 provided in this embodiment further includes a negative electrode unwinding mechanism 160 , a first separator unwinding mechanism 170 , a second separator unwinding mechanism 180 and a positive electrode unwinding mechanism 190 .
  • the negative electrode unwinding mechanism 160 unwinds the negative electrode material tape 101
  • the first diaphragm unwinding mechanism 170 unwinds the first diaphragm material tape 103
  • the second diaphragm unwinding mechanism 180 unwinds the second diaphragm material tape 105
  • the positive electrode unwinding mechanism 190 unwinds Roll the positive electrode material tape 121 .
  • the negative electrode unwinding mechanism 160 in addition to being configured to feed the negative electrode tape 101 , the negative electrode unwinding mechanism 160 also has functions such as negative electrode unwinding deviation correction, tension control adjustment, and process deviation correction, so as to better realize the negative electrode material tape 101 unwinding.
  • the first diaphragm unwinding mechanism 170 and the second diaphragm unwinding mechanism 180 realize the feeding of the first diaphragm material tape 103 and the second diaphragm material tape 105 respectively, and also have unwinding correction, tension control adjustment, and process correction during the feeding process. and other functions.
  • the positive electrode unwinding mechanism 190 is not only configured to feed the positive electrode material tape 121 , but also has the functions of positive electrode unwinding deviation correction, tension control adjustment, process deviation correction, etc., so as to better realize the positive electrode material tape 121 unwinding.
  • the first compound assembly 110 includes a first conveying roller set 111 , a first preheating module 112 and a first compound roller set 113 .
  • the movable end of the negative electrode strip 101 that is continuously unrolled is placed between the movable ends of the first diaphragm strip 103 and the second diaphragm strip 105 that are continuously unrolled, and the three extend into the first strip together.
  • the first conveying roller set 111 rotates to convey the movable ends of the negative electrode strip 101 , the first separator strip 103 and the second separator strip 105 toward the first preheating module 112 .
  • the first preheating module 112 preheats the three, and after preheating, the negative electrode material
  • the belt 101, the first diaphragm material belt 103 and the second diaphragm material belt 105 continue to move towards the first composite roller group 113 under the continuous action of the conveying roller group, and the first composite roller group 113 will preheat the first diaphragm material belt 103 and the second diaphragm material tape 105 are rolled on the negative electrode material tape 101 to realize the compounding of the negative electrode material tape 101 , the first diaphragm material tape 103 and the second diaphragm material tape 105 to obtain the primary composite material tape 107 .
  • the setting of the first preheating module 112 can reduce the composite time and improve the composite effect.
  • the first cutting assembly 120 is disposed downstream of the positive electrode unwinding mechanism 190 and is configured to cut the passed positive electrode strip 121 after unwinding to obtain a plurality of positive electrode sheets 214 .
  • the second composite assembly 130 includes a second conveying roller set 131, a second preheating module 132, and a second composite roller set 133.
  • the plurality of positive electrode sheets 214 obtained after being cut by the first cutting assembly 120 and the primary composite material
  • the belt 107 enters the second conveying roller set 131 together, and under the positioning action of the second conveying roller set 131, the first diaphragm material belt 103 arranged on the first-level composite material belt 107 with a plurality of positive electrode sheets 214 at intervals is kept away from the negative electrode On one side of the material strip 101, and conveyed to the second preheating module 132 together.
  • a plurality of positive electrode plates 214 may also be arranged at intervals successively on the second diaphragm material belt 105 on the first-level composite material belt 107 on the side away from the negative electrode material belt 101, and together to the second preheating module 132 delivery.
  • the second preheating module 132 preheats the positive electrode piece 214 and the composite material belt. Under the continuous action of the roller group 111, the two continue to move towards the second composite roller group 133, and the second composite roller group 133 rolls the positive electrode sheet 214 on the first separator material belt 103 on the primary composite material belt 107 away from the negative electrode material On one side of the strip 101, a secondary composite strip 109 is obtained.
  • the setting of the second preheating module 132 can reduce the composite time and improve the composite effect
  • the second cutting assembly 140 is arranged on the downstream of the second composite roller group 133, and when the secondary composite material belt 109 passes through the second cutting assembly 140, the second cutting assembly 140 is separated between two adjacent positive electrode sheets 214.
  • the gap is the cutting position, and the secondary composite strip 109 is cut multiple times to obtain a plurality of lamination units 210 .
  • the lamination assembly 150 includes a throwing assembly 151 and a splicing assembly 152, and the throwing assembly 151 is arranged downstream of the second cutting assembly 140, configured to accept cutting The last multiple lamination units 210 are thrown and the multiple lamination units 210 are thrown in sequence.
  • the tab assembly 152 is spaced apart from the throwing assembly 151, and the tab assembly 152 is configured to move in the vertical direction to successively receive a plurality of lamination units 210 thrown by the throwing assembly 151, so that the plurality of lamination units 210 is sequentially stacked on the tab assembly 152 .
  • the throwing assembly 151 includes a driving member 1512 and a conveying belt 1511 connected by transmission, the driving member 1512 is configured to drive the conveying belt 1511 to move, and the conveying belt 1511 is configured to carry and convey a plurality of laminated units 210 .
  • the conveyor belt 1511 is arranged side by side by a plurality of transverse ribs 1517 in the first direction Composed of grid-like structures.
  • the conveyor belt 1511 is a grid structure composed of a plurality of transverse ribs 1517 in the second direction arranged side by side at intervals.
  • the conveyor belt 1511 is a grid structure composed of a plurality of transverse ribs 1517 in the first direction and a plurality of transverse ribs 1517 in the second direction arranged crosswise.
  • the first direction is the conveying direction of the conveyor belt 1511
  • the second direction is the conveying direction perpendicular to the conveyor belt 1511 .
  • the conveyor belt 1511 includes a first input end 1513 and a first output end 1514 oppositely arranged, and the first input end 1513 is vertically higher than the first output end 1514; wherein, the first input end 1513 and the first output end 1514
  • the connecting line of is in the same direction as the conveying direction of the conveyor belt 1511.
  • the first input end 1513 is higher than the first output end 1514, so that the conveyor belt 1511 is inclined at a first angle a relative to the horizontal plane, and the first angle is 10° to 25°.
  • the first angle is 12 to 18 degrees, such as 13 degrees, 14 degrees, 15 degrees, 16 degrees or 17 degrees.
  • the conveyor belt 1511 includes a first side 1515 and a second side 1516 oppositely arranged, and the connecting line between the first side 1515 and the second side 1516 is perpendicular to the conveying direction of the conveyor belt 1511, and the first side 1515 of the conveyor belt 1511 is in the vertical direction. above the second side 1516.
  • the first side 1515 is vertically higher than the second side 1516, so that the conveyor belt 1511 is inclined at a second angle b relative to the horizontal plane, and the second angle is 10° to 25°.
  • the second angle is 12 to 18 degrees, such as 13 degrees, 14 degrees, 15 degrees, 16 degrees or 17 degrees.
  • the first input end 1513 of the conveyor belt 1511 is vertically higher than the first output end 1514, that is, the conveyor belt 1511 transports the lamination unit 210 obliquely downward.
  • the conveyor belt 1511 is inclined about 15° in the conveying direction.
  • the first side 1515 of the conveyor belt 1511 is vertically higher than the second side 1516 , which is equivalent to turning the conveyor belt 1511 by about 15°.
  • the conveyor belt 1511 is rectangular, and the two ends of the conveyor belt 1511 in the length direction (that is, the conveying direction of the lamination unit 210) are respectively the first input end 1513 and the first output end 1514, and the two sides in the width direction are It is a first side 1515 and a second side 1516 of unequal height.
  • the side of the lamination unit 210 where the tab 215 is located is a relatively higher side facing the conveyor belt 1511 , that is, the tab 215 faces the first side 1515 .
  • the side of the lamination unit 210 away from the lug 215 faces the relatively lower side (ie, the second side 1516 ) of the conveyor belt 1511 , that is, under the action of the conveyor belt 1511 , the lamination unit 210 is inclined in a self-inclining state. Downward movement.
  • the lamination unit 210 moves to the output end of the conveyor belt 1511, after being thrown out under the action of inertia, the lamination unit 210 still moves in an inclined state, and when it falls on the tab assembly 152, the lamination unit 210 is far away from the tab 215
  • One side of the first contact with the tab assembly 152 bears the gravity of the lamination unit 210 itself to protect the tab 215 and prevent the tab 215 from colliding, deforming or being damaged.
  • the connecting sheet assembly 152 includes a lifting member 1524 and a connecting sheet platform 1521 connected by transmission, and the lifting member 1524 is configured to drive the connecting sheet platform 1521 to move in the vertical direction.
  • the initial position of the splicing platform 1521 is lower than the first output end 1514 of the conveyor belt 1511.
  • the lifting member 1524 drives the splicing platform 1521 to descend by the thickness corresponding to one lamination unit 210. height, to prepare to accept the next lamination unit 210.
  • the lamination platform 1521 is also inclined correspondingly to the conveyor belt 1511 .
  • the tab platform 1521 includes a second input end 1531 and a second output end 1532 oppositely arranged, wherein the second input end 1531 is higher than the second output end 1532 in the vertical direction, so as to be in the conveying direction of the throwing assembly 151
  • the third angle is inclined relative to the horizontal plane;
  • the tab platform 1521 also includes a third side 1533 and a fourth side 1534 oppositely arranged, and the third side 1533 is higher than the fourth side 1534 in the vertical direction, so as to be in the vertical throwing assembly 151
  • the conveying direction is inclined at a fourth angle relative to the horizontal plane.
  • the connecting line between the second input end 1531 and the second output end 1532 is in the same direction as the conveying direction of the conveyor belt.
  • the line connecting the third side 1533 and the fourth side 1534 is perpendicular to the conveying direction of the conveyor belt 1511 .
  • the contact platform 1521 is arranged in a rectangular shape. That is, the second input end 1531 of the splicing platform 1521 is vertically higher than the second output end 1532, corresponding to the conveyor belt 1511, which is equivalent to the second input end 1531 of the splicing platform 1521 being inclined higher than the second output end 1532
  • the third angle of inclination is 10 degrees to 25 degrees.
  • the third angle is 12 to 18 degrees, such as 13 degrees, 14 degrees, 15 degrees, 16 degrees or 17 degrees. In this embodiment, the third angle is 15°.
  • the fourth angle is 10 degrees to 25 degrees.
  • the fourth angle is 12 to 18 degrees, such as 13 degrees, 14 degrees, 15 degrees, 16 degrees or 17 degrees. In this embodiment, the fourth angle is 15°.
  • the second output end 1532 of the tab platform 1521 is provided with a first stop wall 1522, and the third side 1533 of the tab platform 1521 is vertically higher than the fourth side 1534, which is equivalent to the tab platform 1521 Turning itself over about 15°, the second stop wall 1523 is provided on the lower side of the tab platform 1521 in the vertical direction, that is, the fourth side 1534 .
  • the stop wall 1523 stops to realize the positioning of the lamination unit 210, and ensures that the lamination unit 210 that arrives at the lamination platform 1521 later can be aligned with the lamination unit 210 that arrives at the lamination platform 1521 earlier in the stacking direction, without Manual intervention is required.
  • the laminated cell preparation device 100 uses the combination of the throwing assembly 151 and the splicing assembly 152 to laminate multiple lamination units 210.
  • the way of the unit 210 can prevent the lamination unit 210 from being grasped and deformed, so as to improve the yield rate of the lamination cell.
  • the laminated cell preparation device 100 the two-layer separator on the laminated unit 210 obtained by cutting and the two ends of the negative electrode sheet in the length direction are flush and combined together, that is, the separator
  • the cutting edge of the material strip is aligned with the cutting edge of the negative electrode sheet 212 and combined together. Therefore, the ends of the diaphragm do not roll over. Therefore, the laminated cell manufacturing device 100 provided in the present disclosure can prevent the separator from being rolled up and improve the yield of the laminated cell.
  • FIG. 7 is a flow chart of the method for preparing laminated batteries provided in this embodiment.
  • the method for preparing laminated batteries is applied to the device for preparing laminated batteries 100 provided above.
  • the method for preparing laminated batteries can avoid the diaphragm from rolling up and improve the yield.
  • the method for preparing laminated batteries may include the following steps:
  • step S101 the continuous negative electrode strip 101 is compounded between the first separator strip 103 and the second separator strip 105 to obtain a primary composite strip 107 .
  • the compounding of the negative electrode strip 101, the first diaphragm strip 103 and the second diaphragm strip 105 is carried out by rolling, and before rolling, the negative strip 101, the second The first membrane material strip 103 and the second membrane material belt 105 are preheated to improve the rolling effect.
  • other methods can be used to realize the compounding of the negative electrode strip 101, the first separator strip 103 and the second separator strip 105.
  • step S101 may include the following substeps:
  • Sub-step S1011 placing the continuous negative electrode strip 101 between the first separator strip 103 and the second separator strip 105 .
  • the first conveying roller set 111 rotates to convey the negative electrode material belt 101 and the movable ends of the first separator material belt 103 and the second separator material belt 105 toward the first preheating module 112 .
  • Sub-step S1012 preheating the negative electrode strip 101 , the first separator strip 103 and the second separator strip 105 .
  • the first preheating module 112 preheats the three.
  • the belt 101 , the first membrane material belt 103 and the second membrane material belt 105 continue to move toward the first compound roller set 113 under the continuous action of the conveying roller set.
  • Sub-step S1013 rolling the first separator material tape 103 and the second separator material tape 105 onto the negative electrode material tape 101 to obtain a primary composite material tape 107 .
  • the first composite roller group 113 rolls the preheated first diaphragm material tape 103 and the second diaphragm material tape 105 on the negative electrode material tape 101 to realize the alignment of the negative electrode material tape 101 and the first diaphragm material tape 103 and the second diaphragm.
  • the compounding of the material strip 105 obtains the primary composite material strip 107 .
  • the method for preparing laminated cells may also include:
  • Step S102 cutting the positive electrode strip 121 into a plurality of positive electrode sheets 214, and sequentially compounding the plurality of positive electrode sheets 214 on the side of the first separator strip 103 on the primary composite strip 107 away from the negative electrode strip 101 On, obtain the secondary composite strip 109.
  • the first cutting assembly 120 is disposed downstream of the positive electrode unwinding mechanism 190 and is configured to cut the passed positive electrode strip 121 after unwinding to obtain a plurality of positive electrode sheets 214 .
  • the composite of the positive electrode sheet 214 and the primary composite material tape 107 is carried out by rolling, and before rolling, the positive electrode sheet 214 and the primary composite material tape 107 are preheated, To improve the rolling effect.
  • FIG. 9 is a flow chart of a substep of step S102, and step S102 may include the following substeps:
  • a plurality of positive electrode sheets 214 are sequentially placed at intervals on the side of the first separator material belt 103 on the primary composite material belt 107 away from the negative electrode material belt 101 .
  • the plurality of positive electrode sheets 214 obtained after being cut by the first cutting assembly 120 enters the second conveying roller set 131 together with the primary compound material belt 107, and under the positioning action of the second conveying roller set 131, the plurality of positive electrode sheets 214 are sequentially arranged at intervals on the side of the first separator material belt 103 on the primary composite material belt 107 away from the negative electrode material belt 101 , and are transported to the second preheating module 132 together.
  • Sub-step S1022 preheating the plurality of positive electrode sheets 214 and the first-stage composite material tape 107 .
  • the second preheating module 132 preheats the positive electrode piece 214 and the composite material belt. Under the continuous action of the roller set 111, the two continue to move toward the second composite roller set 133.
  • sub-step S1023 rolling a plurality of positive electrode sheets 214 onto the primary composite material tape 107 to obtain a secondary composite material tape 109 .
  • the second composite roll group 133 rolls the positive electrode sheet 214 onto the side of the first separator material belt 103 on the primary composite material belt 107 away from the negative electrode material belt 101 to obtain a secondary composite material belt 109 .
  • the method for preparing laminated cells may also include:
  • Step S103 using the gap between two adjacent positive electrode sheets 214 as the cutting position to cut the secondary composite strip 109 multiple times to obtain multiple lamination units 210 .
  • the second cutting assembly 140 is arranged on the downstream of the second composite roller group 133, and when the secondary composite material belt 109 passes through the second cutting assembly 140, the second cutting assembly 140 is separated between two adjacent positive electrode sheets 214.
  • the gap is the cutting position, and the secondary composite strip 109 is cut multiple times to obtain a plurality of lamination units 210 .
  • the method for preparing laminated cells may also include:
  • Step S104 stacking a plurality of stacked units 210 to obtain a stacked cell.
  • FIG. 10 is a flow chart of a substep of step S104, and step S104 may include the following substeps:
  • sub-step S1041 the multiple laminated units 210 are thrown sequentially, so that the multiple laminated units 210 are stacked sequentially under the action of inertia and gravity.
  • the throwing assembly 151 is disposed downstream of the second cutting assembly 140 and is configured to receive the cut laminated sheets 210 and send the laminated sheets 210 sequentially.
  • the tab assembly 152 is spaced apart from the throwing assembly 151, and the tab assembly 152 can move in the vertical direction to successively receive a plurality of lamination units 210 thrown by the throwing assembly 151, so that the plurality of lamination units 210 Laminations are sequentially stacked on the tab assembly 152 .
  • each lamination unit 210 may drop down to the tab assembly sequentially along a parabola. Every time the tab assembly is connected to a lamination unit 210 , the thickness of one lamination unit 210 is reduced.
  • the two layers of separators on the laminated unit 210 obtained by cutting and the two ends of the negative electrode sheet in the length direction are flush and composited together.
  • the cut edge of the separator strip is aligned with the cut edge of the negative electrode sheet 212 and combined together. Therefore, the ends of the diaphragm do not roll over. Therefore, the laminated cell manufacturing device 100 provided in the present disclosure can prevent the separator from being rolled up and improve the yield of the laminated cell.
  • FIG. 11 is a schematic structural diagram of the laminated battery cell 200 provided in this embodiment.
  • the laminated battery cell 200 provided in this embodiment includes a plurality of laminated units 210 stacked in sequence in the first direction, and the laminated unit 210 includes a second separator 211 and a negative electrode sheet stacked in sequence in the first direction and composited together. 212 , the first diaphragm 213 and the positive electrode sheet 214 , and the negative electrode sheet 212 is flush with both ends of the first diaphragm 213 and the second diaphragm 211 in the length direction.
  • the laminated battery cell 200 provided in this embodiment is prepared by the method for preparing the laminated battery cell 200 provided above.
  • the two ends of the 211 in the length direction are even and compounded together, which can prevent the first separator 213 and the second separator 211 from rolling up, effectively solve the short circuit problem, and have better charge and discharge performance.
  • the area of the positive electrode sheet 214 is smaller than the area of the negative electrode sheet 212 .
  • the laminated battery cell 200 provided by this embodiment has better charge and discharge performance and better product quality.
  • the present disclosure provides a method for preparing a laminated cell, a device for preparing a laminated cell, and a laminated cell, which can prevent the diaphragm from turning over and improve the yield of the laminated cell 200.
  • the laminated cell 200 has more Good charge and discharge performance.

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Abstract

本公开公开了一种叠片电芯制备方法、装置及叠片电芯，涉及电池技术领域。该叠片电芯制备方法包括：将连续的负极料带复合在第一隔膜料带与第二隔膜料带之间，得到一级复合料带；将正极料带裁切成多个正极片，并将多个正极片依次间隔复合在一级复合料带上的第一隔膜料带远离负极料带的一侧上，得到二级复合料带；以相邻的两个正极片之间的间隙为裁切位置对二级复合料带进行多次裁切，得到多个叠片单元；将多个叠片单元进行叠片，得到叠片电芯。本公开提供的叠片电芯制备方法能够避免隔膜发生翻卷，提升叠片电芯成品率。

Description

一种叠片电芯制备方法、装置及叠片电芯
相关申请的交叉引用
本申请要求于2022年02月14日提交中国专利局的申请号为2022101315978、名称为“一种叠片电芯制备方法、装置及叠片电芯”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及电池技术领域，具体而言，涉及一种叠片电芯制备方法、装置及叠片电芯。
背景技术
结合图1，在制备电芯的过程中，连续的正极料带被裁切成正极片10，连续的负极料带被裁切成负极片30后与两层连续的隔膜料带20进行复合，之后对复合得到的整体结构进行裁切得到叠片单元40，再对多个叠片单元40进行叠片得到叠片电芯。
在对复合得到的整体结构进行裁切时，隔膜料带20的裁切边缘与复合在隔膜料带20上的单个正极片10或负极片30的边缘之间存在一定距离L，即裁切后隔膜料带20的裁切边缘与单个正极片10或负极片30的边缘未对齐。这样裁切得到的叠片单元40在长度方向(即隔膜料带的输送方向)上的两端存在部分隔膜未与极片(包括正极片及负极片)复合在一起，这部分隔膜易发生翻卷，使得正极片10和负极片30接触，从而导致制备得到的叠片电芯发生短路。
申请内容
本公开提供一种叠片电芯制备方法、叠片电芯制备装置及叠片电芯，能够防止隔膜发生翻卷，提升叠片电芯成品率。
本公开提供一种技术方案：
一种叠片电芯制备方法，包括：
将连续的负极料带复合在第一隔膜料带与第二隔膜料带之间，得到一级复合料带；
将正极料带裁切成多个正极片，并将多个所述正极片依次间隔复合在所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上，得到二级复合料带；
以相邻的两个所述正极片之间的间隙为裁切位置对所述二级复合料带进行多次裁切，得到多个叠片单元；
将多个所述叠片单元进行叠片，得到叠片电芯。
可选地，所述将连续的负极料带复合在第一隔膜料带与第二隔膜料带之间，得到一级复合料带的步骤包括：
将连续的所述负极料带置于所述第一隔膜料带与所述第二隔膜料带之间；
对所述负极料带与所述第一隔膜料带及所述第二隔膜料带进行预热；
将所述第一隔膜料带与所述第二隔膜料带辊压在所述负极料带上，得到所述一级复合料带。
可选地，所述将多个所述正极片依次间隔复合在所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧，得到二级复合料带的步骤包括：
将多个所述正极片依次间隔置于所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上；
对多个所述正极片与所述一级复合料带进行预热；
将多个所述正极片辊压在所述一级复合料带上，得到所述二级复合料带。
可选地，所述将多个所述正极片依次间隔置于所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上的步骤包括：
裁切正极料带为多个正极片，将多个所述正极片依次间隔置于所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上。
可选地，所述将多个所述叠片单元进行叠片，得到叠片电芯的步骤包括：
依次抛送多个所述叠片单元，以使多个所述叠片单元在惯性与重力作用下依次堆叠。
可选地，所述依次抛送多个所述叠片单元，以使多个所述叠片单元在惯性与重力作用下依次堆叠的步骤包括：
依次抛送多个所述叠片单元，其中，每个所述叠片单元沿抛物线依次下落至接片组件；
所述接片组件每接到一个所述叠片单元，则下降一个所述叠片单元的厚度。
本公开还提供一种叠片电芯制备装置，包括：
第一复合组件，配置成将连续的负极料带复合在第一隔膜料带与第二隔膜料带之 间，得到一级复合料带；
第一裁切组件，配置成将正极料带裁切成多个正极片；
第二复合组件，配置成将多个所述正极片依次间隔复合在所述第一隔膜料带远离所述负极料带的一侧上，得到二级复合料带；
第二裁切组件，配置成以相邻的两个所述正极片之间的间隙为裁切位置对所述二级复合料带进行多次裁切，得到多个叠片单元；
叠片组件，配置成将多个所述叠片单元进行叠片，得到叠片电芯。
可选地，所述叠片组件包括抛送组件及接片组件，所述抛送组件配置成依次抛送多个所述叠片单元，所述接片组件配置成在竖直方向上运动，以依次承接所述抛送组件抛送的多个所述叠片单元，以使多个所述叠片单元在所述接片组件上依次叠片。
可选地，所述抛送组件包括传动连接的驱动件与输送带，所述驱动件配置成驱动所述输送带运动，所述输送带配置成承载并输送多个所述叠片单元，所述输送带包括相对设置的第一输入端和第一输出端，所述第一输入端在竖直方向上高于所述第一输出端；其中，所述第一输入端和所述第一输出端的连线与所述输送带的输送方向同向。
可选地，所述第一输入端高于所述第一输出端，使得所述输送带相对水平面倾斜第一角度，所述第一角度为10度至25度。
可选地，所述输送带包括相对设置的第一侧和第二侧，所述第一侧和所述第二侧的连线与所述输送带的输送方向垂直，所述输送带的第一侧在竖直方向上高于所述第二侧。
可选地，所述第一侧在竖直方向上高于所述第二侧，使得所述输送带相对水平面倾斜第二角度，所述第二角度为10度至25度。
可选地，所述叠片单元包括极耳，所述输送带承接裁切后的所述叠片单元的状态下，所述极耳朝向所述输送带的第一侧。
可选地，所述输送带呈网格状。
可选地，所述接片组件包括传动连接的升降件及接片平台，所述升降件配置成驱动所述接片平台在竖直方向上运动，所述接片平台包括相对设置的第二输入端和第二输出端，其中，所述第二输入端在竖直方向上高于所述第二输出端，以在所述抛送组件的输送方向上相对水平面倾斜第三角度；所述接片平台还包括相对设置的第三侧和第四侧，所述第三侧在竖直方向上高于所述第四侧，以在垂直所述抛送组件的输送方向上相对水 平面倾斜第四角度。
可选地，所述接片平台的第二输出端设置有第一止挡壁，所述接片平台的第四侧设置有第二止挡壁。
可选地，所述第三角度为10度至25度；所述第四角度为10度至25度。
本公开还提供一种叠片电芯，包括多个在第一方向上依次堆叠的叠片单元，所述叠片单元包括在第一方向上依次堆叠并复合在一起的第二隔膜、负极片、第一隔膜及正极片，所述负极片与所述第一隔膜及所述第二隔膜在长度方向(即隔膜料带的输送方向)上的两端均平齐。
可选地，所述正极片的面积小于所述负极片的面积。
相比现有技术，本公开提供的叠片电芯制备方法，由于负极料带是连续的，并与第一隔膜料带与第二隔膜料带复合在一起，因此，在以相邻的两个正极片之间的间隙裁切二级复合料带时，裁切得到的叠片单元上的两层隔膜与负极片在长度方向上是平齐且复合在一起的，因此，隔膜的两端不会发生翻卷。因此，本公开提供的叠片电芯制备方法的有益效果包括：能够避免隔膜发生翻卷，提升叠片电芯成品率。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍。应当理解，以下附图仅示出了本公开的某些实施例，因此不应被看作是对范围的限定。对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为现有技术中正极片、负极片和隔膜料带复合以及裁切形成叠片单元的结构示意图；
图2为本公开的实施例提供的叠片电芯制备装置的结构示意图；
图3为本公开的实施例提供的叠片电芯制备装置的第一复合组件、第二复合组件、第一裁切组件和第二裁切组件的应用场景结构示意图；
图4为本公开的实施例提供的正极片、负极料带和隔膜料带复合以及裁切形成叠片单元的结构示意图；
图5为本公开的实施例提供的叠片电芯制备装置的输送带输送叠片单元的结构示意图；
图6为本公开的实施例提供的叠片电芯制备装置的接片平台承接叠片单元的结构示 意图；
图7为本公开的实施例提供的叠片电芯制备方法的流程框图；
图8为图5中步骤S101的一种子步骤流程框图；
图9为图5中步骤S102的一种子步骤流程框图；
图10为图5中步骤S104的一种子步骤流程框图；
图11为本公开的实施例提供的叠片电芯的结构示意图。
图标：10-正极片；20-隔膜料带；30-负极片；40-叠片单元；100-叠片电芯制备装置；101-负极料带；103-第一隔膜料带；105-第二隔膜料带；107-一级复合料带；109-二级复合料带；110-第一复合组件；111-第一输送辊组；112-第一预热模组；113-第一复合辊组；120-第一裁切组件；121-正极料带；130-第二复合组件；131-第二输送辊组；132-第二预热模组；133-第二复合辊组；140-第二裁切组件；150-叠片组件；151-抛送组件；1511-输送带；1512-驱动件；1513-第一输入端；1514-第一输出端；1515-第一侧；1516-第二侧；1517-横筋；152-接片组件；1521-接片平台；1522-第一止挡壁；1523-第二止挡壁；1524-升降件；1531-第二输入端；1532-第二输出端；1533-第三侧；1534-第四侧；160-负极放卷机构；170-第一隔膜放卷机构；180-第二隔膜放卷机构；190-正极放卷机构；200-叠片电芯；210-叠片单元；211-第二隔膜；212-负极片；213-第一隔膜；214-正极片；215-极耳。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本公开实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本公开的实施例的详细描述并非旨在限制要求保护的本公开的范围，而是仅仅表示本公开的选定实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本公开的描述中，需要理解的是，术语“上”、“下”、“内”、“外”、“左”、“右”等 指示的方位或位置关系为基于附图所示的方位或位置关系，或者是该公开产品使用时惯常摆放的方位或位置关系，或者是本领域技术人员惯常理解的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的设备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公开的限制。
此外，术语“第一”、“第二”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
在本公开的描述中，还需要说明的是，除非另有明确的规定和限定，“设置”、“连接”等术语应做广义理解，例如，“连接”可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接连接，也可以通过中间媒介间接连接，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
下面结合附图，对本公开的具体实施方式进行详细说明。
请参阅图2至图11，其中，图2所示为本实施例提供的叠片电芯制备装置100的结构示意图；图3为本公开的实施例提供的叠片电芯制备装置100的第一复合组件110、第二复合组件130、第一裁切组件120和第二裁切组件140的应用场景结构示意图；图4为本公开的实施例提供的正极片214、负极料带101和隔膜料带复合以及裁切形成叠片单元210的结构示意图。
本实施例提供的叠片电芯制备装置100包括第一复合组件110、第一裁切组件120、第二复合组件130、第二裁切组件140及叠片组件150。
第一复合组件110，配置成将连续的负极料带101复合在第一隔膜料带103与第二隔膜料带105之间，得到一级复合料带107。第一裁切组件120，配置成将正极料带121裁切成多个正极片214。第二复合组件130，配置成将多个正极片214依次间隔复合在第一隔膜料带103远离负极料带101的一侧上，得到二级复合料带109。第二裁切组件140，配置成以相邻的两个正极片214之间的间隙为裁切位置对二级复合料带109进行多次裁切，得到多个叠片单元210。叠片组件150，配置成将多个叠片单元210进行叠片，得到叠片电芯。由于负极料带101在与第一隔膜料带103、第二隔膜料带105复合时为连续料带，这样，在经第二裁切组件140裁切后，可以确保负极料带101、第一隔膜料带103和第二隔膜料带105的切割边缘对齐，且第一隔膜料带103和第二隔膜料带105分别与负极料带101复合在一起，有效防止隔膜料带的切割边缘翻卷而使正负极片 接触发生短路。容易理解，第一隔膜料带103被裁切后形成叠片单元210中的第一隔膜213；第二隔膜料带105被裁切后形成叠片单元210中的第二隔膜211。
本实施例提供的叠片电芯制备装置100还包括负极放卷机构160、第一隔膜放卷机构170、第二隔膜放卷机构180及正极放卷机构190。负极放卷机构160放卷负极料带101，第一隔膜放卷机构170放卷第一隔膜料带103，第二隔膜放卷机构180放卷第二隔膜料带105，正极放卷机构190放卷正极料带121。
可选地，负极放卷机构160除了配置成对负极料带101进行送料，还具有负极放卷纠偏、张力控制调节、过程纠偏等功能，以更好地实现负极料带101的放料。
第一隔膜放卷机构170和第二隔膜放卷机构180分别实现第一隔膜料带103和第二隔膜料带105的送料，同时在送料过程中还具有放卷纠偏、张力控制调节、过程纠偏等功能。类似地，正极放卷机构190除了配置成对正极料带121进行送料，还具有正极放卷纠偏、张力控制调节、过程纠偏等功能，以更好地实现正极料带121的放料。
第一复合组件110包括第一输送辊组111、第一预热模组112及第一复合辊组113。在实际应用中，将连续放卷的负极料带101的活动端置于连续放卷的第一隔膜料带103及第二隔膜料带105的活动端之间，并三者一同伸入第一输送辊组111内，第一输送辊组111转动，朝第一预热模组112输送负极料带101、第一隔膜料带103与第二隔膜料带105的活动端。
在负极料带101、第一隔膜料带103及第二隔膜料带105经过第一预热模组112时，第一预热模组112对三者进行预热，经过预热后，负极料带101、第一隔膜料带103及第二隔膜料带105在输送辊组的持续作用下继续朝第一复合辊组113运动，第一复合辊组113将预热后的第一隔膜料带103及第二隔膜料带105辊压在负极料带101上，实现对负极料带101、第一隔膜料带103及第二隔膜料带105的复合，得到一级复合料带107。第一预热模组112的设置能够减少复合时间，提高复合效果。
第一裁切组件120设置于正极放卷机构190的下游，配置成对放卷后经过的正极料带121进行裁切，以得到多个正极片214。
第二复合组件130包括第二输送辊组131、第二预热模组132及第二复合辊组133，经过第一裁切组件120裁切后得到的多个正极片214与一级复合料带107一起进入第二输送辊组131，在第二输送辊组131的定位作用下，将多个正极片214依次间隔排布在一级复合料带107上的第一隔膜料带103远离负极料带101的一侧上，并一起向第二预 热模组132输送。可选地，也可以将多个正极片214依次间隔排布在一级复合料带107上的第二隔膜料带105远离负极料带101的一侧上，并一起向第二预热模组132输送。
在正极片214与一级复合料带107经过第二预热模组132时，第二预热模组132对正极片214及以及复合料带进行预热，经过预热后，在第一输送辊组111的持续作用下，二者继续向第二复合辊组133运动，第二复合辊组133将正极片214辊压在一级复合料带107上的第一隔膜料带103远离负极料带101的一侧上，得到二级复合料带109。第二预热模组132的设置能够减少复合时间，提高复合效果
第二裁切组件140设置于第二复合辊组133的下游，二级复合料带109在经过第二裁切组件140时，第二裁切组件140以相邻的两个正极片214之间的间隙为裁切位置对二级复合料带109进行多次裁切，得到多个叠片单元210。
结合图2、图5和图6，本实施例中，叠片组件150包括抛送组件151及接片组件152，抛送组件151设置于第二裁切组件140的下游，配置成承接裁切后的多个叠片单元210并依次抛送多个叠片单元210。接片组件152与抛送组件151间隔设置，并且接片组件152配置成在竖直方向上运动，以依次承接抛送组件151抛送的多个叠片单元210，以使多个叠片单元210在接片组件152上依次叠片。
抛送组件151包括传动连接的驱动件1512与输送带1511，驱动件1512配置成驱动输送带1511运动，输送带1511配置成承载并输送多个叠片单元210。为了减小输送带1511与叠片单元210之间的接触面积，以方便对叠片单元210的抛送，本实施例中，输送带1511为由多个第一方向的横筋1517间隔并列排布组成的网格状结构。或者，输送带1511为由多个第二方向的横筋1517间隔并列排布组成的网格状结构。或者，输送带1511为由多个第一方向的横筋1517和多个第二方向的横筋1517交叉排布组成的网格状结构。其中，第一方向为输送带1511的输送方向，第二方向为垂直输送带1511的输送方向。
输送带1511包括相对设置的第一输入端1513和第一输出端1514，第一输入端1513在竖直方向上高于第一输出端1514；其中，第一输入端1513和第一输出端1514的连线与输送带1511的输送方向同向。第一输入端1513高于第一输出端1514，使得输送带1511相对水平面倾斜第一角度a，第一角度为10度至25度。可选地，第一角度为12至18度，比如13度、14度、15度、16度或17度等。输送带1511包括相对设置的第一侧1515和第二侧1516，第一侧1515和第二侧1516的连线与输送带1511的输送方向 垂直，输送带1511的第一侧1515在竖直方向上高于第二侧1516。第一侧1515在竖直方向上高于第二侧1516，使得输送带1511相对水平面倾斜第二角度b，第二角度为10度至25度。可选地，第二角度为12至18度，比如13度、14度、15度、16度或17度等。
为了方便对叠片单元210的抛送，本实施例中，输送带1511的第一输入端1513在竖直方向上高于第一输出端1514，即输送带1511倾斜向下输送叠片单元210，本实施例中，输送带1511在输送方向上倾斜约15°。另外，考虑到对叠片单元210上的极耳215的保护，输送带1511的第一侧1515在竖直方向上高于第二侧1516，相当于输送带1511翻转约15°。本实施例中，输送带1511呈矩形，输送带1511长度方向(即叠片单元210的输送方向)上的两端分别为第一输入端1513与第一输出端1514，宽度方向上的两边即为高度不等的第一侧1515和第二侧1516。
在实际应用中，叠片单元210上极耳215所在的一侧为朝向输送带1511的相对较高的一侧，即极耳215朝向第一侧1515。叠片单元210上远离极耳215的一侧朝向输送带1511的相对较低的一侧(即第二侧1516)，即在输送带1511的作用下，叠片单元210以自身倾斜的状态倾斜向下运动。在叠片单元210运动至输送带1511的输出端后，在惯性作用下抛出后，叠片单元210仍以倾斜状态运动，落在接片组件152上时，叠片单元210远离极耳215的一侧率先与接片组件152接触，承受叠片单元210自身的重力，实现对极耳215的保护，避免极耳215撞击变形或损坏。
接片组件152包括传动连接的升降件1524及接片平台1521，升降件1524配置成驱动接片平台1521在竖直方向上运动。实际上，接片平台1521的初始位置低于输送带1511的第一输出端1514，在接收到前一个叠片单元210后，升降件1524驱动接片平台1521下降对应一个叠片单元210厚度的高度，以准备承接后一个叠片单元210。
为了保证在后的叠片单元210在到达接片平台1521上后能够自动完成与在前的叠片单元210的对齐堆叠，本实施例中，接片平台1521同样对应输送带1511倾斜设置。接片平台1521包括相对设置的第二输入端1531和第二输出端1532，其中，第二输入端1531在竖直方向上高于第二输出端1532，以在抛送组件151的输送方向上相对水平面倾斜第三角度；接片平台1521还包括相对设置的第三侧1533和第四侧1534，第三侧1533在竖直方向上高于第四侧1534，以在垂直抛送组件151的输送方向上相对水平面倾斜第四角度。其中，第二输入端1531和第二输出端1532的连线与输送带的输送方向 同向。第三侧1533和第四侧1534的连线与输送带1511的输送方向垂直。本实施例中，接片平台1521呈矩形设置。即接片平台1521的第二输入端1531在竖直方向上高于第二输出端1532，对应输送带1511，相当于接片平台1521的第二输入端1531高出第二输出端1532呈倾斜设置，倾斜的第三角度为10度至25度。可选地，第三角度为12至18度，比如13度、14度、15度、16度或17度等。本实施例中，第三角度为15°。
可选地，第四角度为10度至25度。可选地，第四角度为12至18度，比如13度、14度、15度、16度或17度等。本实施例中，第四角度为15°。
可选地，接片平台1521的第二输出端1532设置有第一止挡壁1522，接片平台1521的第三侧1533在竖直方向上高于第四侧1534，相当于接片平台1521自身翻转约15°，接片平台1521在竖直方向上更低的一侧，即第四侧1534设置有第二止挡壁1523。
在实际应用中，输送带1511抛送出的叠片单元210在惯性与重力作用下到达接片平台1521时，惯性方向的运动受第一止挡壁1522止挡，重力方向的运动受第二止挡壁1523止挡，实现对叠片单元210的定位，保证在后到达接片平台1521的叠片单元210能够与在先到达接片平台1521的叠片单元210在堆叠方向上对齐，而不需要人工干涉。
本实施例提供的叠片电芯制备装置100采用抛送组件151与接片组件152的组合对多个叠片单元210进行叠片，相较于传统叠片过程中采用的机械手抓取叠片单元210的方式，能够避免叠片单元210被抓取变形，以提升叠片电芯的良品率。
综上，本实施例提供的叠片电芯制备装置100，裁切得到的叠片单元210上的两层隔膜与负极片在长度方向上的两端是平齐且复合在一起的，即隔膜料带的裁切边缘与负极片212的裁切边缘对齐，且复合在一起。因此，隔膜的两端不会发生翻卷。因此，本公开提供的叠片电芯制备装置100能够避免隔膜发生翻卷，提升叠片电芯成品率。
请参阅图7，图7所示为本实施例提供的叠片电芯制备方法的流程框图。该叠片电芯制备方法应用于上文提供的叠片电芯制备装置100，该叠片电芯制备方法能够避免隔膜翻卷，提升成品率，该叠片电芯制备方法可以包括以下步骤：
步骤S101，将连续的负极料带101复合在第一隔膜料带103与第二隔膜料带105之间，得到一级复合料带107。
负极料带101、第一隔膜料带103及第二隔膜料带105的复合采用辊压的方式进行，并且，在进行辊压之前，通过第一预热模组112对负极料带101、第一隔膜料带103及第二隔膜料带105进行预热，以提升辊压效果。在可选实施例中，还可以根据实际应用 条件，采用其他方式实现对负极料带101、第一隔膜料带103及第二隔膜料带105的复合。
请参阅图8，图8所示为步骤S101的一种子步骤流程框图，步骤S101可以包括以下子步骤：
子步骤S1011，将连续的负极料带101置于第一隔膜料带103与第二隔膜料带105之间。
将连续放卷的负极料带101的活动端置于连续放卷的第一隔膜料带103及第二隔膜料带105的活动端之间，并三者一同伸入第一输送辊组111内，第一输送辊组111转动，朝第一预热模组112输送负极料带101及第一隔膜料带103与第二隔膜料带105的活动端。
子步骤S1012，对负极料带101与第一隔膜料带103及第二隔膜料带105进行预热。
在负极料带101与第一隔膜料带103及第二隔膜料带105经过第一预热模组112时，第一预热模组112对三者进行预热，经过预热后，负极料带101与第一隔膜料带103及第二隔膜料带105在输送辊组的持续作用下继续朝第一复合辊组113运动。
子步骤S1013，将第一隔膜料带103与第二隔膜料带105辊压在负极料带101上，得到一级复合料带107。
第一复合辊组113将预热后的第一隔膜料带103及第二隔膜料带105辊压在负极料带101上，实现对负极料带101与第一隔膜料带103及第二隔膜料带105的复合，得到一级复合料带107。
请继续参阅图7，可选的，该叠片电芯制备方法还可以包括：
步骤S102，将正极料带121裁切成多个正极片214，并将多个正极片214依次间隔复合在一级复合料带107上的第一隔膜料带103远离负极料带101的一侧上，得到二级复合料带109。
第一裁切组件120设置于正极放卷机构190的下游，配置成对放卷后经过的正极料带121进行裁切，以得到多个正极片214。
同样的，本实施例中，正极片214与一级复合料带107的复合采用辊压的方式进行，并且，在进行辊压之前，对正极片214与一级复合料带107进行预热，以提升辊压效果。
请参阅图9，图9所示为步骤S102的一种子步骤流程框图，步骤S102可以包括以下子步骤：
子步骤S1021，将多个正极片214依次间隔置于一级复合料带107上的第一隔膜料带103远离负极料带101的一侧上。
经过第一裁切组件120裁切后得到的多个正极片214与一级复合料带107一起进入第二输送辊组131，在第二输送辊组131的定位作用下，将多个正极片214依次间隔排布在一级复合料带107上的第一隔膜料带103远离负极料带101的一侧上，并一起向第二预热模组132输送。
子步骤S1022，对多个正极片214与一级复合料带107进行预热。
在正极片214与一级复合料带107经过第二预热模组132时，第二预热模组132对正极片214及以及复合料带进行预热，经过预热后，在第一输送辊组111的持续作用下，二者继续向第二复合辊组133运动。
子步骤S1023，将多个正极片214辊压在一级复合料带107上，得到二级复合料带109。
第二复合辊组133将正极片214辊压在一级复合料带107上的第一隔膜料带103远离负极料带101的一侧上，得到二级复合料带109。
请继续参阅图7，可选的，该叠片电芯制备方法还可以包括：
步骤S103，以相邻的两个正极片214之间的间隙为裁切位置对二级复合料带109进行多次裁切，得到多个叠片单元210。
第二裁切组件140设置于第二复合辊组133的下游，二级复合料带109在经过第二裁切组件140时，第二裁切组件140以相邻的两个正极片214之间的间隙为裁切位置对二级复合料带109进行多次裁切，得到多个叠片单元210。
可选的，该叠片电芯制备方法还可以包括：
步骤S104，将多个叠片单元210进行叠片，得到叠片电芯。
请参阅图10，图10所示为步骤S104的一种子步骤流程框图，步骤S104可以包括以下子步骤：
子步骤S1041，依次抛送多个叠片单元210，以使多个叠片单元210在惯性与重力作用下依次堆叠。
抛送组件151设置于第二裁切组件140的下游，配置成承接裁切后的多个叠片单元210并依次抛送多个叠片单元210。接片组件152与抛送组件151间隔设置，并且接片组件152能够在竖直方向上运动，以依次承接抛送组件151抛送的多个叠片单元210， 以使多个叠片单元210在接片组件152上依次叠片。可选地，依次抛送多个叠片单元210时，其中，每个叠片单元210可沿抛物线依次下落至接片组件。接片组件每接到一个叠片单元210，则下降一个叠片单元210的厚度。
因此，本实施例提供的叠片电芯制备方法，裁切得到的叠片单元210上的两层隔膜与负极片在长度方向上的两端是平齐且复合在一起的。换言之，隔膜料带的裁切边缘与负极片212的裁切边缘对齐，且复合在一起。因此，隔膜的两端不会发生翻卷。因此，本公开提供的叠片电芯制备装置100能够避免隔膜发生翻卷，提升叠片电芯成品率。
请参阅图11，图11所示为本实施例提供的叠片电芯200的结构示意图。
本实施例提供的叠片电芯200包括多个在第一方向上依次堆叠的叠片单元210，叠片单元210包括在第一方向上依次堆叠并复合在一起的第二隔膜211、负极片212、第一隔膜213及正极片214，负极片212与第一隔膜213及第二隔膜211在长度方向上的两端均平齐。
本实施例提供的叠片电芯200由上文提供的叠片电芯200制备方法制备得到，该叠片电芯200的叠片单元210中的负极片212与第一隔膜213及第二隔膜211在长度方向上的两端均平齐且复合在一起，能够避免第一隔膜213与第二隔膜211翻卷，有效解决了短路问题，具有更好的充放电性能。可选地，正极片214的面积小于负极片212的面积。
因此，本实施例提供的叠片电芯200具有更好的充放电性能，产品质量更好。
以上仅为本公开的优选实施例而已，并不配置成限制本公开，对于本领域的技术人员来说，本公开可以有各种更改和变化。凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。
工业实用性
本公开提供的一种叠片电芯制备方法、一种叠片电芯制备装置和叠片电芯，能够防止隔膜发生翻卷，提升叠片电芯200的成品率，叠片电芯200具有更好的充放电性能。

Claims (19)

  1. 一种叠片电芯制备方法，其特征在于，包括：
    将连续的负极料带复合在第一隔膜料带与第二隔膜料带之间，得到一级复合料带；
    将正极料带裁切成多个正极片，并将多个所述正极片依次间隔复合在所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上，得到二级复合料带；
    以相邻的两个所述正极片之间的间隙为裁切位置对所述二级复合料带进行多次裁切，得到多个叠片单元；
    将多个所述叠片单元进行叠片，得到叠片电芯。
  2. 根据权利要求1所述的叠片电芯制备方法，其特征在于，所述将连续的负极料带复合在第一隔膜料带与第二隔膜料带之间，得到一级复合料带的步骤包括：
    将连续的所述负极料带置于所述第一隔膜料带与所述第二隔膜料带之间；
    对所述负极料带与所述第一隔膜料带及所述第二隔膜料带进行预热；
    将所述第一隔膜料带与所述第二隔膜料带辊压在所述负极料带上，得到所述一级复合料带。
  3. 根据权利要求1或2所述的叠片电芯制备方法，其特征在于，所述将多个所述正极片依次间隔复合在所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧，得到二级复合料带的步骤包括：
    将多个所述正极片依次间隔置于所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上；
    对多个所述正极片与所述一级复合料带进行预热；
    将多个所述正极片辊压在所述一级复合料带上，得到所述二级复合料带。
  4. 根据权利要求1至3中任一项所述的叠片电芯制备方法，其特征在于，所述将多个所述正极片依次间隔置于所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上的步骤包括：
    裁切正极料带为多个正极片，将多个所述正极片依次间隔置于所述一级复合料带上的所述第一隔膜料带远离所述负极料带的一侧上。
  5. 根据权利要求1至4中任一项所述的叠片电芯制备方法，其特征在于，所述将多个所述叠片单元进行叠片，得到叠片电芯的步骤包括：
    依次抛送多个所述叠片单元，以使多个所述叠片单元在惯性与重力作用下依次堆叠。
  6. 根据权利要求5所述的叠片电芯制备方法，其特征在于，所述依次抛送多个所述叠片单元，以使多个所述叠片单元在惯性与重力作用下依次堆叠的步骤包括：
    依次抛送多个所述叠片单元，其中，每个所述叠片单元沿抛物线依次下落至接片组件；
    所述接片组件每接到一个所述叠片单元，则下降一个所述叠片单元的厚度。
  7. 一种叠片电芯制备装置，其特征在于，包括：
    第一复合组件，配置成将连续的负极料带复合在第一隔膜料带与第二隔膜料带之间，得到一级复合料带；
    第一裁切组件，配置成将正极料带裁切成多个正极片；
    第二复合组件，配置成将多个所述正极片依次间隔复合在所述第一隔膜料带远离所述负极料带的一侧上，得到二级复合料带；
    第二裁切组件，配置成以相邻的两个所述正极片之间的间隙为裁切位置对所述二级复合料带进行多次裁切，得到多个叠片单元；
    叠片组件，配置成将多个所述叠片单元进行叠片，得到叠片电芯。
  8. 根据权利要求7所述的叠片电芯制备装置，其特征在于，所述叠片组件包括抛送组件及接片组件，所述抛送组件配置成依次抛送多个所述叠片单元，所述接片组件配置成在竖直方向上运动，以依次承接所述抛送组件抛送的多个所述叠片单元，以使多个所述叠片单元在所述接片组件上依次叠片。
  9. 根据权利要求8所述的叠片电芯制备装置，其特征在于，所述抛送组件包括传动连接的驱动件与输送带，所述驱动件配置成驱动所述输送带运动，所述输送带配置成承载并输送多个所述叠片单元，所述输送带包括相对设置的第一输入端和第一输出端，所述第一输入端在竖直方向上高于所述第一输出端；其中，所述第一输入端和所述第一输出端的连线与所述输送带的输送方向同向。
  10. 根据权利要求9所述的叠片电芯制备装置，其特征在于，所述第一输入端高于所述第一输出端，使得所述输送带相对水平面倾斜第一角度，所述第一角度为10度至25度。
  11. 根据权利要求9或10所述的叠片电芯制备装置，其特征在于，所述输送带包括 相对设置的第一侧和第二侧，所述第一侧和所述第二侧的连线与所述输送带的输送方向垂直，所述输送带的第一侧在竖直方向上高于所述第二侧。
  12. 根据权利要求11所述的叠片电芯制备装置，其特征在于，所述第一侧在竖直方向上高于所述第二侧，使得所述输送带相对水平面倾斜第二角度，所述第二角度为10度至25度。
  13. 根据权利要求11或12所述的叠片电芯制备装置，其特征在于，所述叠片单元包括极耳，所述输送带承接裁切后的所述叠片单元的状态下，所述极耳朝向所述输送带的第一侧。
  14. 根据权利要求9至13中任一项所述的叠片电芯制备装置，其特征在于，所述输送带呈网格状。
  15. 根据权利要求8至14中任一项所述的叠片电芯制备装置，其特征在于，所述接片组件包括传动连接的升降件及接片平台，所述升降件配置成驱动所述接片平台在竖直方向上运动，所述接片平台包括相对设置的第二输入端和第二输出端，其中，所述第二输入端在竖直方向上高于所述第二输出端，以在所述抛送组件的输送方向上相对水平面倾斜第三角度；所述接片平台还包括相对设置的第三侧和第四侧，所述第三侧在竖直方向上高于所述第四侧，以在垂直所述抛送组件的输送方向上相对水平面倾斜第四角度。
  16. 根据权利要求15所述的叠片电芯制备装置，其特征在于，所述接片平台的第二输出端设置有第一止挡壁，所述接片平台的第四侧设置有第二止挡壁。
  17. 根据权利要求15或16所述的叠片电芯制备装置，其特征在于，所述第三角度为10度至25度；所述第四角度为10度至25度。
  18. 一种叠片电芯，其特征在于，由如权利要求1-6中任一项所述的叠片电芯制备方法制备得到，该叠片电芯包括多个在第一方向上依次堆叠的叠片单元，所述叠片单元包括在第一方向上依次堆叠并复合在一起的第二隔膜、负极片、第一隔膜及正极片，所述负极片与所述第一隔膜及所述第二隔膜在长度方向上的两端均平齐。
  19. 根据权利要求18所述的叠片电芯，其特征在于，所述正极片的面积小于所述负极片的面积。
PCT/CN2022/119364 2022-02-14 2022-09-16 一种叠片电芯制备方法、装置及叠片电芯 WO2023151274A1 (zh)

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