WO2022179621A1 - 电芯及叠片装置 - Google Patents

电芯及叠片装置 Download PDF

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Publication number
WO2022179621A1
WO2022179621A1 PCT/CN2022/078009 CN2022078009W WO2022179621A1 WO 2022179621 A1 WO2022179621 A1 WO 2022179621A1 CN 2022078009 W CN2022078009 W CN 2022078009W WO 2022179621 A1 WO2022179621 A1 WO 2022179621A1
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WO
WIPO (PCT)
Prior art keywords
polar
tape
diaphragm
strip
pole piece
Prior art date
Application number
PCT/CN2022/078009
Other languages
English (en)
French (fr)
Inventor
赵凯
李昆芃
郑赫
Original Assignee
蜂巢能源科技股份有限公司
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Application filed by 蜂巢能源科技股份有限公司 filed Critical 蜂巢能源科技股份有限公司
Publication of WO2022179621A1 publication Critical patent/WO2022179621A1/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
    • H01M10/05—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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of power batteries, for example, to a battery cell and a lamination device.
  • Lithium-ion device technology is a key technology for the development of electric vehicles. Square-stacked batteries are widely used, and the speed of manufacturing directly determines the production capacity of the entire line and the cost of battery cell manufacturing.
  • the manufacturing process of a battery cell in the related art is as follows: first, the positive electrode sheet is punched into a plurality of monolithic positive electrodes, the negative electrode sheet is punched into a plurality of monolithic negative electrodes, and a plurality of spaced apart by hot pressing A single-sheet positive electrode or a plurality of single-sheet-shaped negative electrodes arranged at intervals are placed between two sheets of adhesive separators to form a pole-piece separator strip bag, and then a plurality of single-sheet negative electrodes or a plurality of single-sheet-shaped positive electrodes are placed in the electrode.
  • the two sides of the diaphragm strip bag are heated and pressed to form a pole piece material strip, and then the pole piece material strip is folded in a Z-shape to form a laminated battery core.
  • the manufacturing speed of this kind of Z-type laminated cell is relatively slow, and each positive electrode sheet and each negative electrode sheet need to be punched into sheets, which takes a long time to manufacture.
  • the corners of the positive electrode or negative electrode between the diaphragms need to be V-angled, resulting in a large number of equipment and a large footprint, prolonging the manufacturing time, reducing the production efficiency and increasing the production cost.
  • the present application provides an electric core, which can omit the process of punching and processing fillets by using a continuous strip between two diaphragms, shorten the manufacturing time, improve the production efficiency, and reduce the cost.
  • An embodiment provides a battery cell, including a Z-folded battery pole piece tape, wherein the battery pole piece tape includes a first polar tape, a first separator tape, and a second separator tape and a plurality of second polar sheets, the first diaphragm material and the second diaphragm material are respectively covered on both sides of the first polar material, and the first polar material includes a belt-shaped material.
  • first polar dressings coated on the strip-shaped current collector at intervals along the extending direction of the strip-shaped current collector, and the first membrane strip material is opposite to the first polar strip
  • One side of the material and the side of the second diaphragm tape opposite to the first polar tape are respectively provided with the second polar sheets, and a plurality of the second polar sheets are connected to a plurality of places.
  • the first polar dressings are in one-to-one correspondence; the battery pole piece tapes are arranged to be folded at the tape-shaped current collector between two adjacent first polar dressings.
  • An embodiment provides a lamination device, which can improve the production efficiency of battery cells, shorten the production time, and reduce the production cost.
  • a lamination device for manufacturing the above-mentioned battery comprising: a first discharging mechanism, including a first discharging roller configured to supply the first polar tape; a diaphragm supplying A feeding mechanism, comprising a first diaphragm roller configured to supply the first diaphragm strip and a second diaphragm roller configured to supply the second diaphragm strip, the first diaphragm roller and the second diaphragm roller are respectively Set on both sides of the first polar tape, so that the first diaphragm tape and the second diaphragm tape are covered on both sides of the first polar tape; the second discharge mechanism , placed on the side of the first diaphragm tape opposite to the first polar tape, and configured to supply the second polar sheet to the first diaphragm tape; the third discharging mechanism , placed on the side of the second diaphragm tape opposite to the first polar tape, and configured to supply the second polar sheet to the second diaphra
  • FIG. 1 is a schematic structural diagram of a battery cell provided in Embodiment 1 of the present application.
  • FIG. 2 is a schematic diagram of the partially folded battery pole piece tape provided in Embodiment 1 of the present application;
  • FIG. 3 is a schematic structural diagram of a first polar tape provided in Embodiment 1 of the present application.
  • FIG. 4 is a side view of the first polar tape provided in Embodiment 1 of the present application.
  • FIG. 5 is a schematic structural diagram of the first polar tape provided in Embodiment 1 of the present application before die cutting;
  • FIG. 6 is a schematic structural diagram of a lamination device provided in Embodiment 1 of the present application.
  • FIG. 7 is a schematic structural diagram of a lamination device provided in Embodiment 2 of the present application.
  • FIG. 8 is a schematic structural diagram of a lamination device provided by an embodiment of the present application.
  • 100 battery pole piece tape; 10, first polarity tape; 101, strip current collector; 1011, pole lug; 102, first polarity dressing; 20, second polarity sheet; 21, second pole Sex tape; 30, the first diaphragm tape; 40, the second diaphragm tape;
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • connection may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • a first feature "on” or “under” a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the battery cell includes a battery pole piece tape 100 folded in a Z-shape.
  • the battery electrode strip 100 includes a first polar strip 10, a plurality of second polar strips 20, a first diaphragm strip 30 and a second diaphragm strip 40, and the first diaphragm strip 30 and the second diaphragm strip
  • the material 40 is respectively covered on both sides of the first polar strip material 10, and the first polar strip material 10 includes a strip-shaped current collector 101 and a strip-shaped current collector 101 that is coated on the strip-shaped current collector 101 at intervals along the extending direction of the strip-shaped current collector 101.
  • the second polar sheets 20 are arranged, and the plurality of second polar sheets 20 are in one-to-one correspondence with the plurality of first polar dressings 102;
  • the strip-shaped current collector is folded at 101 .
  • This embodiment provides a battery cell, in which a strip-shaped first polar strip 10 is used between the first diaphragm strip 30 and the second diaphragm strip 40 , compared with the plurality of spaced-apart strips in the related art
  • a single-piece positive electrode or a plurality of single-piece negative electrodes arranged at intervals are encapsulated between two sheets of separators to form a pole piece separator strip bag.
  • the structure of the sharp corners of the diaphragm tape 40 omits the process of punching and processing the V-angle for the first polar tape 10, shortens the manufacturing time, improves the production efficiency, reduces the cost, and reduces the need for production equipment.
  • the first polarity tape 10 adopts the structure in which the first polarity dressings 102 are arranged on the tape-shaped current collector 101 at intervals, which avoids the re-processing of fold marks on the first polarity tape 10, and ensures the battery pole piece tape 100. It can be folded at the strip-shaped current collector 101 between two adjacent first polar dressings 102, which simplifies the production process and avoids the need for the first polar dressing on the first polar tape 10 in the process of reprocessing.
  • the damage of 102 is avoided, so as to avoid powder falling from the first polarity dressing 102 to other parts, and the quality and qualification rate of the battery cells are ensured.
  • the two second polar sheets 20 corresponding to two adjacent first polar dressings 102 are respectively placed on the first diaphragm tape 30 and the second diaphragm tape 40 to ensure that the The polar dressings 102 and the second polar sheets 20 are alternately arranged.
  • the first polar dressing 102 is coated on the tape current collector 101 at intervals.
  • the first polar dressing 102 can also be continuously coated on the tape current collector 101.
  • the strip-shaped current collector 101 it is only necessary to ensure that the interval between two adjacent second polar sheets 20 along the extension direction of the strip-shaped current collector 101 is the same, which simplifies the processing of the first polar strip material 10 process.
  • the first polarity is opposite to the second polarity.
  • the first polarity is a negative electrode
  • the second polarity is a positive electrode
  • the first polarity tape material 10 is a negative electrode tape material
  • the first polarity dressing 102 is a negative electrode dressing
  • the second polarity sheet 20 is a negative electrode tape material. positive plate.
  • the length of the negative electrode dressing at each location is the same
  • the length of the positive electrode sheet is also the same
  • the length of the negative electrode dressing is greater than the length of the positive electrode sheet.
  • the width of the negative electrode dressing is not less than the width of the positive electrode sheet.
  • the first polarity may also be a positive electrode, and then the second polarity is a negative electrode, which is not limited herein.
  • a positive electrode strip can also be used instead of a positive electrode sheet, that is to say, the positive electrode strip also includes a strip-shaped current collector 101 used as a positive electrode and a strip-shaped current collector 101 that is coated on the strip at intervals along the extending direction of the strip-shaped current collector 101 .
  • the first diaphragm material 30 is made of insulating material and adopts a rubberized diaphragm, and the two sides of the diaphragm are respectively coated with an adhesive layer, which is convenient for fixing the first polar tape 10 and the second polar sheet 20 and avoids During the folding process of the battery pole piece tape 100 , the first polarity tape material 10 and the second polarity piece 20 move, thereby ensuring the positional correspondence between the negative electrode dressing and the positive electrode piece, and ensuring the function of the battery cell sex.
  • the second diaphragm material 40 is also made of insulating material and adopts a rubberized diaphragm, and the two sides of the diaphragm are respectively coated with an adhesive layer, so as to avoid the first polar belt material 10 and the first polar belt material 10 and the The second polar sheet 20 moves, thereby ensuring the positional correspondence between the negative electrode dressing and the positive electrode sheet, and ensuring the functionality of the battery.
  • the thickness and material of the adhesive layer on the first diaphragm tape 30 and the second diaphragm tape 40 are determined according to actual requirements, and are not limited herein. In one embodiment, in order to ensure good insulation between the second polar sheet 20 and the first polar dressing 102 on the first polar tape 10, the first diaphragm tape 30 and the second diaphragm tape 40 respectively as continuous strips.
  • the interval between two adjacent first polarity dressings 102 is 0.5-10 mm, which can be adjusted adaptively according to parameters such as the size of the cell. Since the first polarity is a negative electrode, the material of the strip-shaped current collector 101 is copper foil, and the material of the first polarity dressing 102 can be determined according to actual requirements, which is not limited herein.
  • FIG. 5 is a schematic structural diagram of the first polar tape 10 before die cutting
  • the first polar dressing 102 covers the first end of the tape current collector 101 perpendicular to the extending direction
  • the strip-shaped current collector 101 at the second end in the extending direction protrudes from the first polar dressing 102, and the excess material of the strip-shaped current collector 101 on the protruding side is cut off during the die-cutting process.
  • the strip-shaped current collector 101 on the protruding side forms a tab 1011 , which is specifically a negative tab in this embodiment.
  • the lamination device includes a first discharge mechanism, a diaphragm discharge mechanism, a second discharge mechanism, a third discharge mechanism, a heat sealing mechanism 6 and a lamination mechanism 13 .
  • the first discharge mechanism includes a first discharge roller 1 configured to supply the first polar tape 10;
  • the diaphragm discharge mechanism includes a first diaphragm roller 41 configured to supply the first diaphragm tape 30 and a first diaphragm roller 41 configured to supply the second.
  • the second diaphragm roller 42, the first diaphragm roller 41 and the second diaphragm roller 42 of the diaphragm strip 40 are respectively arranged on both sides of the first polar strip 10, so that the first diaphragm strip 30 and the second diaphragm strip are 40 is covered on both sides of the first polar band material 10; the second discharging mechanism is placed on the side of the first diaphragm band material 30 opposite to the first polar band material 10, and is set to the first diaphragm band material 30 The second polar sheet 20 is supplied on the top; the third discharging mechanism is placed on the side of the second diaphragm tape 40 opposite to the first polar tape 10, and is configured to supply the second polar sheet to the second diaphragm tape 40.
  • the heat sealing mechanism 6 includes a pressing component and two sets of heating components 61, and the two sets of heating components 61 are respectively placed upstream of the pressing component and are respectively set to heat the first diaphragm material 30 and the second diaphragm material 40,
  • the pressing assembly is configured to press and stack the first polar strip material 10 , the first diaphragm strip material 30 , the second diaphragm strip material 40 and the second polar sheet material 20 to form the battery pole piece strip material 100 .
  • the lamination mechanism 13 is placed downstream of the heat sealing mechanism 6, and is arranged to fold the battery pole strip material 100 into a Z shape.
  • the present embodiment provides a lamination device, which can supply the second polar sheets 20 to the first diaphragm web 30 and the second diaphragm web 40 simultaneously on both sides of the first polar web 10, thereby improving the The production efficiency of the battery cell shortens the production time and reduces the production cost.
  • the heat sealing mechanism is set to realize the first polar strip 10, the first diaphragm strip 30, the second diaphragm strip 40 and the second polar sheet 20 to form the battery pole strip 100, which improves the connection firmness between the parts. It avoids the movement of each part when the battery pole piece material 100 is folded to form the battery cell, and ensures the qualified rate of the battery core.
  • the heat-sealing mechanism 6 includes a heating component 61 for heating the first diaphragm strip 30 and the second diaphragm strip 40 and a pressing component downstream of the heating component 61, so that the first diaphragm strip 30 and the first diaphragm strip 30 and the second diaphragm can be heated before pressing.
  • Heating the two diaphragm strips 40 avoids heating the stacked first polar strips 10 , the first diaphragm strips 30 , the second diaphragm strips 40 and the second polar sheets 20 together, reducing the amount of heating required.
  • the thickness of the material accelerates the heating rate and further improves the production efficiency.
  • each group of heating elements 61 includes two heating elements, and the two heating elements are spaced apart and opposite to each other. It is convenient to heat the first diaphragm material 30 and the second diaphragm material 40 .
  • the first polar tape 10 discharged from the first feeding roller 1 is conveyed in the horizontal direction
  • the first diaphragm roller 41 and the second feeding mechanism are arranged above the first polar tape 10
  • the two diaphragm rollers 42 and the third discharging mechanism are arranged below the first polar strip 10 .
  • the second discharging mechanism is set to supply the second polar sheet 20 above the first diaphragm strip 30
  • the third discharging mechanism is configured to supply the second polar sheet 20 below the second diaphragm material 40 .
  • the lamination mechanism 13 includes a material box and a gas nozzle for air injection, the top of the material box is open, the gas nozzle is arranged on the side wall of the material box, and the battery pole piece material 100 enters the material box through the opening, And one side of the battery pole strip material 100 is facing the gas nozzle.
  • the end of the battery pole piece tape material 100 enters the material box, and the air nozzle blows air to the battery pole piece tape material 100, so that the battery pole piece tape material 100 is located in the two adjacent first at the end.
  • the strip-shaped current collector 101 between one polar dressing 102 is folded, and the remaining battery pole piece strips 100 are automatically folded due to the action of gravity. And the folding mechanism is not shown in FIG. 6 .
  • the second feeding mechanism includes a second feeding roller 2 configured to supply the second polarity tape 21 and a first cutting member 51, and the first cutting member 51 is configured to cut the second feeding member 51.
  • the second polar strip 21 discharged from the feed roll 2 is used to form the second polar sheet 20 .
  • the first cutting member 51 is a cutting knife. Since the second polarity is the positive electrode, the second polarity tape material 21 is the positive electrode tape material. In other embodiments, if a strip-shaped positive electrode material is used instead of a positive electrode sheet to participate in the folding process of the battery electrode sheet material 100 , the first cutting member 51 may not be provided.
  • the third feeding mechanism includes a third feeding roller 3 configured to supply the second polarity tape 21 and a second cutting member 52, and the second cutting member 52 is configured to cut the third feeding member 52.
  • the second polar strip 21 discharged from the feed roll 3 is used to form the second polar sheet 20 .
  • the second cutting member 52 is a cutting knife. Since the second polarity is the positive electrode, the second polarity tape material 21 is the positive electrode tape material. In other embodiments, if a strip-shaped positive electrode material is used instead of the positive electrode sheet to participate in the folding process of the battery electrode sheet material 100 , the second cutting member 52 may not be provided.
  • the conveying speed of the first polarity strip material 10 is twice the conveying speed of the second polarity strip material 21, that is, The linear speed of the first feeding roller 1 is twice that of the second feeding roller 2 , and the linear speed of the third feeding roller 3 is the same as that of the second feeding roller 2 .
  • the pressing assembly further includes a pressing roller 62 disposed downstream of the heating assembly 61 , two pressing rollers 62 are arranged in parallel and spaced apart, and the two pressing rollers 62 are respectively placed on the battery pole piece tape 100 . on both sides.
  • Setting the pressing roller 62 can realize the first polar strip 10, the first diaphragm strip 30, the second diaphragm strip 40 and the second polar sheet 20 to form the battery pole strip 100, which improves the distance between the parts.
  • the firmness of the connection avoids the movement of each part when the battery pole piece tape 100 is folded to form the battery cell, and ensures the qualification rate of the battery cell.
  • the first polar strip 10 , the first diaphragm strip 30 , the second diaphragm strip 40 and the second polar sheet 20 can pass through the gap between the two pressing rollers 62 , and the two pressing rollers 62 is configured to clamp and press the stacked first polar strip 10 , first separator strip 30 , second separator strip 40 and second polar sheet 20 to form battery pole strip strip 100 .
  • the heating assembly 61 is arranged between the pressing roller 62 and the diaphragm discharging mechanism.
  • the lamination device may further include a pressing protection mechanism, there are two pressing protection mechanisms, and the two pressing protection mechanisms are respectively arranged on both sides of the battery pole piece tape material 100, that is, the battery pole piece belt.
  • the pressing protection mechanism located above the battery pole piece strip material 100 includes a PET film unwinding roller and a PET film winding roller, the PET film unwinding roller is set to supply the PET film, and the PET film winding roller is set For winding PET film.
  • the PET film unwinding roller is located upstream of the pressing roller 62 above the battery pole piece tape 100, the PET film winding roller is located downstream of the pressing roller 62 above the battery pole piece tape 100, and the PET film unwinding roller
  • the PET film can be passed between the second polar sheet 20 and the pressing roller 62 above the battery polar sheet tape 100 and taken back by the PET film winding roller, avoiding the contact between the pressing roller 62 and the second polar sheet 20. direct contact.
  • the pressing protection mechanism located under the battery pole piece tape 100 is the same as the above structure, and also includes a PET film unwinding roller and a PET film winding roller.
  • the PET film unwinding roller is used to supply the PET film, and the PET film winding roller is set to Rewind PET film.
  • the PET film unwinding roller is located upstream of the pressing roller 62 below the battery pole piece tape 100, the PET film winding roller is located downstream of the pressing roller 62 below the battery pole piece tape 100, and the PET film unwinding roller
  • the PET film can be inserted between the second polar sheet 20 and the pressing roller 62 below the battery polar sheet tape 100 and taken back by the PET film winding roller, avoiding the contact between the pressing roller 62 and the second polar sheet 20. direct contact.
  • the lamination device further includes a driving mechanism 12 , and the driving mechanism 12 is placed between the heat sealing mechanism 6 and the lamination mechanism 13 .
  • the drive mechanism 12 is configured to provide power for the conveyance of the battery pole piece strip 100 in the lamination device.
  • the driving mechanism 12 includes two sets of conveyor belts, each set of conveyor belts is respectively provided with a driving wheel and a driven wheel, the transmission belt is wound around the driving wheel and the driven wheel, and the two sets of conveyor belts are respectively arranged on the battery pole piece belt.
  • the two sides of the material 100 that is, the upper side and the lower side of the battery pole piece strip material 100, the battery pole piece strip material 100 passes through the gap between the two sets of conveyor belts, and uses friction to drive the battery pole piece 100.
  • the lamination device further includes a reject member 7, and the reject member 7 is configured to reject the waste material on the battery pole piece tape 100, and the waste reject piece 7 is provided to avoid the waste material on the battery pole piece tape 100. It is folded in the cell to ensure the pass rate of the cell.
  • the waste rejecting member 7 can cut and remove the battery pole piece branch tapes where the wastes are located from the battery pole piece tapes 100 at the same time during the process of rejecting the wastes.
  • the lamination device further includes an image capture member 8 .
  • the image collection part 8 is located between the waste rejection part 7 and the heat sealing mechanism 6, and two image collection parts 8 are provided, and the two image collection parts 8 are respectively placed on both sides of the battery pole piece tape material 100 to collect the battery pole piece tapes. images on both sides of the material 100.
  • the image capturing element 8 can be arranged to detect the waste material on the battery pole piece tape 100, so that the waste material 7 can easily remove the waste material.
  • two adjacent places The two positive electrode sheets corresponding to the negative electrode dressing are respectively located above the first separator tape 30 and below the second separator tape 40, and the length of the negative electrode dressing is greater than the length of the positive electrode sheet, and the width of the negative electrode dressing is not less than the width of the positive electrode sheet , that is to say, the positive electrode sheet under the second separator strip 40 can be completely covered by the negative electrode dressing corresponding to the positive electrode sheet from above.
  • the positive electrode sheet above the first separator strip material 30 can be covered with the positive electrode sheet.
  • the corresponding negative electrode dressing is completely covered from below.
  • two image capturing elements 8 are provided, which can capture images on both sides of the battery pole piece tape material 100, so as to more accurately determine the position of the waste material on the battery pole piece tape material 100. , to ensure the qualified rate of the cell.
  • the image acquisition part 8 is a CCD camera. In other embodiments, the image acquisition part 8 may also use other cameras, which is not limited here.
  • the lamination device further comprises a cutting member 9 .
  • the cutting member 9 is placed between the lamination mechanism 13 and the rejecting member 7, the cutting member 9 can cut the battery pole piece tape 100, and the cutting piece 9 can be set to cut off the battery pole piece tape 100 at a preset length, which is convenient for adjustment.
  • the length of the battery pole piece strip material 100 used to fold to form the battery cell expands the applicable scope of the lamination device.
  • the cutting position of the cutting member 9 is the interval between two adjacent negative electrode dressings.
  • the cutting member 9 can be a laser cutting device. In other embodiments, the cutting member 9 may also be other devices, which are not limited herein.
  • this embodiment is further provided with a pre-pressing component on the lamination device.
  • the pre-pressing assembly includes two parallel and spaced-apart pre-pressing rollers 11.
  • the pre-pressing roller 11 is placed between the heating assembly 61 and the pressing roller 62.
  • the pre-pressing roller 11 is configured to press and stack the first polar tape 10. , the first diaphragm material 30 and the second diaphragm material 40 .
  • the stacked first polar The sexual tape 10, the first diaphragm tape 30 and the second diaphragm tape 40 are pre-pressed to ensure that when the subsequent pressing roller 62 is pressed, the first polar tape 10, the first diaphragm tape 30 and the The position of the second diaphragm material 40 moves, which further ensures the pass rate of the cells processed by the device.

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Abstract

一种电芯及叠片装置，电芯包括呈Z型折叠的电池极片带料，电池极片带料包括第一极性带料、第一隔膜带料、第二隔膜带料和多个第二极性片，第一隔膜带料与第二隔膜带料分别覆盖在第一极性带料的两侧，第一极性带料包括带状集流体和间隔涂布在带状集流体上的多处第一极性敷料，第一隔膜带料和第二隔膜带料相背于第一隔膜带料的一侧上分别设置第二极性片，且多个第二极性片与多处第一极性敷料一一对应；电池极片带料在相邻两处第一极性敷料之间的带状集流体处折叠。

Description

电芯及叠片装置
本申请要求申请日为2021年2月26日、申请号为202120428030.8的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及动力电池技术领域，例如涉及一种电芯及叠片装置。
背景技术
在使用传统能源作为动力供给的汽车工业环境下，环境污染问题愈发严重，积极发展新能源汽车，能够减少对于环境的危害。锂离子设备技术是电动汽车发展的关键技术。方形叠片的电池被广泛应用，其中，制造速度的快慢直接决定整线产能与电芯制造成本。相关技术中一种电芯的制作过程是：先将正极片冲切成多个单片状正极，将负极片冲切成多个单片状负极，通过热压方式将间隔排布的多个单片状正极或间隔排布的多个单片状负极置于两片带胶隔膜之间以形成极片隔膜条袋，再将多个单片状负极或多个单片状正极置于极片隔膜条袋的两侧并加热压合形成极片料带，之后将该极片料带进行Z型折叠，形成叠片式电芯。此种Z型叠片电芯的制造速度较慢，且需要将每个正极片和每个负极片均冲切为片状，制造时间较长，且为了避免极片直角刺穿隔膜，在两片隔膜之间的正极片或负极片的拐角处需要进行V角处理，造成设备台数需求量大，占地面积大，延长了制造时间，降低了生产效率，提高了生产成本。
发明内容
本申请提供了一种电芯，通过两片隔膜之间采用连续的带料，能够省略冲切和加工圆角的过程，缩短了制造时间，提高了生产效率，降低了成本。
一实施例提供了一种电芯，包括呈Z型折叠的电池极片带料，其中，所述电池极片带料包括第一极性带料、第一隔膜带料、第二隔膜带料和多个第二极性片，所述第一隔膜带料与所述第二隔膜带料分别覆盖在所述第一极性带料的两侧，所述第一极性带料包括带状集流体和沿所述带状集流体的延伸方向间隔涂布在所述带状集流体上的多处第一极性敷料，所述第一隔膜带料相背于所述第一极性带料的一侧和所述第二隔膜带料相背于所述第一极性带料的一侧分别设 置所述第二极性片，且多个所述第二极性片与多处所述第一极性敷料一一对应；所述电池极片带料设置为在相邻两处所述第一极性敷料之间的所述带状集流体处折叠。
一实施例提供了一种叠片装置，能够提高电芯的生产制造的效率，缩短了生产时间，降低了生产成本。
一种叠片装置，用于制造如上所述的电芯，所述叠片装置包括：第一放料机构，包括设置为供给所述第一极性带料的第一放料辊；隔膜供料机构，包括设置为供给所述第一隔膜带料的第一隔膜辊和设置为供给所述第二隔膜带料的第二隔膜辊，所述第一隔膜辊和所述第二隔膜辊分别设置在所述第一极性带料的两侧，以使所述第一隔膜带料与所述第二隔膜带料覆盖在所述第一极性带料的两侧；第二放料机构，置于所述第一隔膜带料相背于所述第一极性带料的一侧，设置为向所述第一隔膜带料上供给所述第二极性片；第三放料机构，置于所述第二隔膜带料相背于所述第一极性带料的一侧，设置为向所述第二隔膜带料上供给所述第二极性片；热合机构，所述热合机构包括压合组件和两组加热组件，两组所述加热组件分别置于所述压合组件的上游且分别设置为加热所述第一隔膜带料和所述第二隔膜带料，所述压合组件设置为压合叠放的所述第一极性带料、所述第一隔膜带料、所述第二隔膜带料和所述第二极性片以形成所述电池极片带料；及叠片机构，置于所述热合机构下游，设置为将折叠所述电池极片带料为Z型。
附图说明
图1是本申请实施例一提供的电芯的结构示意图；
图2是本申请实施例一提供的电池极片带料部分折叠的示意图；
图3是本申请实施例一提供的第一极性带料的结构示意图；
图4是本申请实施例一提供的第一极性带料的侧视图；
图5是本申请实施例一提供的第一极性带料在模切前的结构示意图；
图6是本申请实施例一提供的叠片装置的结构示意图；
图7是本申请实施例二提供的叠片装置的结构示意图；
图8是本申请一实施提供的叠片装置的结构示意图。
图中：
100、电池极片带料；10、第一极性带料；101、带状集流体；1011、极耳； 102、第一极性敷料；20、第二极性片；21、第二极性带料；30、第一隔膜带料；40、第二隔膜带料；
1、第一放料辊；2、第二放料辊；3、第三放料辊；
41、第一隔膜辊；42、第二隔膜辊；51、第一裁切件；52、第二裁切件；
6、热合机构；61、加热组件；62、压合辊；
7、剔废件；8、图像采集件；9、切割件；11、预压辊；12、驱动机构；13、叠片机构。
具体实施方式
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本实用新型中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
实施例一
本实施例提供了一种电芯。如图1-图5所示，电芯包括呈Z型折叠的电池极片带料100。电池极片带料100包括第一极性带料10、多个第二极性片20，以及第一隔膜带料30和第二隔膜带料40，第一隔膜带料30与第二隔膜带料40分别覆盖在第一极性带料10的两侧，第一极性带料10包括带状集流体101和沿带状集流体101的延伸方向间隔涂布在带状集流体101上的多处第一极性敷料102，第一隔膜带料30相背于第一极性带料10的一侧和第二隔膜带料40相背于第一极性带料10的一侧上分别设置第二极性片20，且多个第二极性片20与多处第一极性敷料102一一对应；电池极片带料100在相邻两处第一极性敷料102之间的带状集流体 101处折叠。本实施例提供了一种电芯，在第一隔膜带料30与第二隔膜带料40之间采用带状的第一极性带料10，相较相关技术中将间隔排布的多个单片状正极或间隔排布的多个单片状负极封装于两片隔膜之间以形成极片隔膜条袋的方式，本实施例提供的电芯减少了第一隔膜带料30与第二隔膜带料40的尖角的结构，省略了对于第一极性带料10的冲切和加工V角的过程，缩短了制造时间，提高了生产效率，降低了成本，同时降低了对于生产设备种类的需求，减小了生产所需要占用的面积，也减少了能源上的需求与后期维护的需求，进一步降低了成本。且第一极性带料10采用在带状集流体101上间隔设置第一极性敷料102的结构，避免了在第一极性带料10再次加工折叠痕迹，保证了电池极片带料100能够在相邻两处第一极性敷料102之间的带状集流体101处折叠，简化了生产过程，也避免了再次加工的过程中对于第一极性带料10上第一极性敷料102的损伤，从而避免从第一极性敷料102上向其他部分掉落粉料，保证了电芯的质量和合格率。在本实施例中，相邻两处第一极性敷料102所对应的两个第二极性片20分别置于第一隔膜带料30和第二隔膜带料40上，保证折叠后第一极性敷料102和第二极性片20交替设置。本实施例使用的第一极性带料10中，第一极性敷料102间隔涂布在带状集流体101上，在其他实施例中，也可以将第一极性敷料102连续涂布在带状集流体101上，仅需保证沿带状集流体101的延伸方向上的相邻两个第二极性片20之间的间隔相同即可，简化了第一极性带料10的加工过程。
在一实施例中，第一极性与第二极性相反。在本实施例中，第一极性为负极，第二极性为正极，则第一极性带料10为负极带料，第一极性敷料102为负极敷料，第二极性片20为正极片。此外，对于沿带状集流体101延伸的方向上而言，每一处的负极敷料的长度相同，正极片的长度也相同，且负极敷料的长度大于正极片的长度。对于垂直于带状集流体101延伸的方向上而言，负极敷料的宽度不小于正极片的宽度。在一实施例中，第一极性还可以为正极，那么第二极性为负极，在此不作限定。此外，在其他实施例中，还可以采用正极带料代替正极片，也就是说正极带料也包括用作正极的带状集流体101和沿带状集流体101的延伸方向间隔涂布在带状集流体101上的多处正极敷料，正极敷料与负极敷料的位置相对应，此时，正极带料有两条，分别位于第一隔膜带料30和第二隔膜带料40相背于第一隔膜带料30的一侧，相邻两处负极敷料所对应的两处正极敷料分别位于两条不同的正极带料上。
在本实施例中，第一隔膜带料30为绝缘材质且采用涂胶隔膜，隔膜的两侧 分别涂覆有胶层，便于固定第一极性带料10和第二极性片20，避免在电池极片带料100折叠的过程中第一极性带料10和第二极性片20产生窜动，从而保证了负极敷料与正极片之间的位置对应关系，保证了电芯的功能性。同理，第二隔膜带料40也为绝缘材质且采用涂胶隔膜，隔膜的两侧分别涂覆有胶层，避免在电池极片带料100折叠的过程中第一极性带料10和第二极性片20产生窜动，从而保证了负极敷料与正极片之间的位置对应关系，保证了电池的功能性。第一隔膜带料30与第二隔膜带料40上的胶层的厚度与材质根据实际需求确定，在此不作限定。在一实施例中，为了保证第二极性片20与第一极性带料10上的第一极性敷料102之间能够良好的绝缘，第一隔膜带料30和第二隔膜带料40分别为连续的带状。
在本实施例中，相邻两个第一极性敷料102之间的间隔为0.5～10mm，具体可根据电芯尺寸等参数适应性调整。由于第一极性为负极，带状集流体101的材质为铜箔，第一极性敷料102的材质可根据实际需求确定，在此不作限定。
在一实施例中，如图5所示为第一极性带料10在模切前的结构示意图，第一极性敷料102覆在带状集流体101上垂直于延伸方向的第一端，延伸方向的第二端的带状集流体101凸出于第一极性敷料102，模切的过程中将凸出一侧的带状集流体101的多余材料切除。如图3所示，经过模切后，凸出一侧的带状集流体101形成极耳1011，具体在本实施例中为负极极耳。
本实施例还提供了一种叠片装置，用于制造如上的电芯。具体地，如图6和如8所示，叠片装置包括第一放料机构、隔膜放料机构、第二放料机构、第三放料机构、热合机构6和叠片机构13。第一放料机构包括设置为供给第一极性带料10的第一放料辊1；隔膜放料机构包括设置为供给第一隔膜带料30的第一隔膜辊41和设置为供给第二隔膜带料40的第二隔膜辊42，第一隔膜辊41和第二隔膜辊42分别设置在第一极性带料10的两侧，以使第一隔膜带料30与第二隔膜带料40覆盖在第一极性带料10的两侧；第二放料机构置于第一隔膜带料30相背于第一极性带料10的一侧，设置为向第一隔膜带料30上供给第二极性片20；第三放料机构置于第二隔膜带料40相背于第一极性带料10的一侧，设置为向第二隔膜带料40上供给第二极性片20；热合机构6包括压合组件和两组加热组件61，两组加热组件61分别置于压合组件的上游且分别设置为加热第一隔膜带料30和第二隔膜带料40，压合组件设置为压合叠放第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20，以形成电池极片带料100。叠片机构13置于热合机 构6下游，设置为将电池极片带料100折叠为Z型。本实施例提供了一种叠片装置，能够实现在第一极性带料10的两侧同时向第一隔膜带料30和第二隔膜带料40上供给第二极性片20，提高了电芯的生产制造的效率，缩短了生产时间，降低了生产成本。设置热合机构实现第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20形成电池极片带料100，提高了部分之间的连接牢固程度，避免了在电池极片带料100折叠形成电芯时各部分产生窜动，保证了电芯的合格率。此外，热合机构6包括对第一隔膜带料30和第二隔膜带料40加热的加热组件61以及处于加热组件61下游的压合组件，能够在压合前对第一隔膜带料30和第二隔膜带料40进行加热，避免了将叠放的第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20共同加热，降低了需要加热的材料的厚度，加快了加热速率，进一步提高了生产效率。而且相关技术中用作热压机构的装置的结构也相对复杂，将加热组件61与压合组件分开设置，也在一定程度上能够简化装置结构，减少了占地面积。两组加热组件61分别用于加热第一隔膜带料30和第二隔膜带料40，分别加热第一隔膜带料30与第二隔膜带料40，保证加热效果，便于后续压合形成电池极片带料100。在本实施例中，每组加热组件61包括两个加热件，两个加热件间隔且相对设置，第一隔膜带料30或第二隔膜带料40穿设于同组加热组件61的间隔，便于对第一隔膜带料30与第二隔膜带料40加热。
在本实施例中，第一放料辊1放出的第一极性带料10沿水平方向输送，第一隔膜辊41和第二放料机构设置在第一极性带料10的上方，第二隔膜辊42和第三放料机构设置在第一极性带料10的下方，可以理解的是，第二放料机构设置为向第一隔膜带料30的上方供给第二极性片20，第三放料机构设置为向第二隔膜带料40的下方供给第二极性片20。
在一实施例中，叠片机构13包括料盒和用于喷气的气嘴，料盒的顶端开口，气嘴设置在料盒的侧壁上，电池极片带料100通过开口进入料盒，且电池极片带料100的一侧正对于气嘴。当在制造电芯时，电池极片带料100的端部进入料盒，气嘴向电池极片带料100吹气，使得电池极片带料100在位于端部的两个相邻的第一极性敷料102之间的带状集流体101处折叠，剩余的电池极片带料100由于重力作用自动折叠。且折叠机构在图6中未示出。
在一实施例中，第二放料机构包括设置为供给第二极性带料21的第二放料辊2和第一裁切件51，第一裁切件51设置为裁切第二放料辊2放出的第二极性带 料21以形成第二极性片20。在本实施例中，第一裁切件51为裁切刀。由于第二极性为正极，那么第二极性带料21为正极带料。在其他实施例中，若使用带状的正极带料代替正极片参与电池极片带料100的折叠过程，也可不设置第一裁切件51。
在一实施例中，第三放料机构包括设置为供给第二极性带料21的第三放料辊3和第二裁切件52，第二裁切件52设置为裁切第三放料辊3放出的第二极性带料21以形成第二极性片20。在本实施例中，第二裁切件52为裁切刀。由于第二极性为正极，那么第二极性带料21为正极带料。在其他实施例中，若使用带状的正极带料代替正极片参与电池极片带料100的折叠过程，也可不设置第二裁切件52。
在一实施例中，由于正极片可同时在负极带料的上方与下方供给，那么第一极性带料10的输送速度为第二极性带料21的输送速度的两倍，也就是说第一放料辊1的线速度为第二放料辊2的线速度的两倍，且第三放料辊3的线速度与第二放料辊2的线速度相同。
在一实施例中，压合组件还包括置于加热组件61下游的压合辊62，压合辊62平行且间隔设置有两个，两个压合辊62分别置于电池极片带料100的两侧。设置压合辊62，能够实现第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20形成电池极片带料100，提高了部分之间的连接牢固程度，避免了在电池极片带料100折叠形成电芯时每个部分产生窜动，保证了电芯的合格率。第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20能够穿设于两个压合辊62之间的间隙处，且两个压合辊62设置为夹紧并压合叠放的第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20以形成电池极片带料100。为了在压合前对隔膜加热，加热组件61设置在压合辊62与隔膜放料机构之间。
在一实施例中，叠片装置还可包括压合保护机构，压合保护机构设有两个，两个压合保护机构分别设置在电池极片带料100的两侧，即电池极片带料100的上方和下方，位于电池极片带料100上方的压合保护机构包括PET膜放料辊和PET膜收卷辊，PET膜放料辊设置为供给PET膜，PET膜收卷辊设置为卷收PET膜。PET膜放料辊位于电池极片带料100上方的压合辊62的上游，PET膜收卷辊位于电池极片带料100上方的压合辊62的下游，且PET膜放料辊放出的PET膜能够穿设于第二极性片20与电池极片带料100上方的压合辊62之间并被PET膜收卷辊收回，避 免了压合辊62与第二极性片20之间直接接触。位于电池极片带料100下方的压合保护机构与上述结构相同，也包括PET膜放料辊和PET膜收卷辊，PET膜放料辊用于供给PET膜，PET膜收卷辊设置为卷收PET膜。PET膜放料辊位于电池极片带料100下方的压合辊62的上游，PET膜收卷辊位于电池极片带料100下方的压合辊62的下游，且PET膜放料辊放出的PET膜能够穿设于第二极性片20与电池极片带料100下方的压合辊62之间并被PET膜收卷辊收回，避免了压合辊62与第二极性片20之间直接接触。
在一实施例中，如图8所示，叠片装置还包括驱动机构12，驱动机构12置于热合机构6与叠片机构13之间。驱动机构12设置为为叠片装置中电池极片带料100的输送提供动力。在一实施例中，驱动机构12包括两组传送带，每组传送带上分别设置有一个主动轮和一个从动轮，传动带绕设在主动轮和从动轮上，两组传送带分别设置在电池极片带料100的两侧，即电池极片带料100的上侧和下侧，电池极片带料100穿设于两组传送带之间的间隙，利用摩擦力驱动电池极片100的输送。
在一实施例中，叠片装置还包括剔废件7，剔废件7设置为剔除电池极片带料100上的废料，设置剔废件7，避免了电池极片带料100上的废料被折叠在电芯中，保证了电芯的合格率。在一实施例中，若将相邻两处第一极性敷料102以及所对应的两个第二极性片20看作一组电池极片分支带料，多组电池极片分支带料依次连接形成电池极片带料100，那么剔废件7在剔废的过程中能够将废料所处的电池极片分支带料同时从电池极片带料100上剪切并剔除。
在一实施例中，叠片装置还包括图像采集件8。图像采集件8位于剔废件7与热合机构6之间，图像采集件8设置有两个，两个图像采集件8分别置于电池极片带料100的两侧，以采集电池极片带料100的两侧的图像。设置图像采集件8能够检测电池极片带料100上的废料，便于剔废件7将废料剔除。由于相邻两处第一极性敷料102所对应的两个第二极性片20分别置于第一隔膜带料30和第二隔膜带料40上，在一实施例中，相邻两处负极敷料所对应的两个正极片分别位于第一隔膜带料30的上方以及第二隔膜带料40的下方，且负极敷料的长度大于正极片的长度，负极敷料的宽度不小于正极片的宽度，也就是说，在第二隔膜带料40的下方的正极片能够被与正极片对应的负极敷料从上方完全覆盖，同理在第一隔膜带料30的上方的正极片能够被与正极片对应的负极敷料从下方完全覆盖，因此本实施里设置两个图像采集件8，能够在电池极片带料100的两侧采集图像， 从而更准确的判断电池极片带料100上废料的位置，保证了电芯的合格率。在本实施例中，图像采集件8为CCD相机，在其他实施例中，图像采集件8还可采用其他相机，在此不作限定。
在一实施例中，叠片装置还包括切割件9。切割件9置于叠片机构13与剔废件7之间，切割件9能够切断电池极片带料100，设置切割件9能够在预设长度处切断电池极片带料100，便于调整用于折叠形成电芯的电池极片带料100的长度，扩大了叠片装置的适用范围。在一实施例中，切割件9的切割位置为相邻两处负极敷料之间的间隔处。在本实施例中，切割件9可为激光切割装置。在其他实施例中，切割件9还可为其他装置，在此不作限定。
实施例二
本实施例相较实施例一而言，如图7所示，在叠片装置上还设置有预压组件。预压组件包括两个平行且间隔设置的预压辊11，预压辊11置于加热组件61和压合辊62之间，预压辊11设置为压合叠放第一极性带料10、第一隔膜带料30和第二隔膜带料40。在将叠放的第一极性带料10、第一隔膜带料30、第二隔膜带料40和第二极性片20形成电池极片带料100之前，能够将叠放的第一极性带料10、第一隔膜带料30和第二隔膜带料40进行预压合，保证了在后续压合辊62压合时，第一极性带料10、第一隔膜带料30和第二隔膜带料40发生位置移动，进一步保证了使用本装置加工的电芯的合格率。

Claims (10)

  1. 一种电芯，包括呈Z型折叠的电池极片带料(100)；
    其中，所述电池极片带料(100)包括第一极性带料(10)、第一隔膜带料(30)、第二隔膜带料(40)和多个第二极性片(20)，所述第一隔膜带料(30)与所述第二隔膜带料(40)分别覆盖在所述第一极性带料(10)的两侧，所述第一极性带料(10)包括带状集流体(101)和沿所述带状集流体(101)的延伸方向间隔涂布在所述带状集流体(101)上的多处第一极性敷料(102)，所述第一隔膜带料(30)相背于所述第一极性带料(10)的一侧和所述第二隔膜带料(40)相背于所述第一极性带料(10)的一侧分别设置所述第二极性片(20)，且多个所述第二极性片(20)与多处所述第一极性敷料(102)一一对应；所述电池极片带料(100)设置为在相邻两处所述第一极性敷料(102)之间的所述带状集流体(101)处折叠。
  2. 一种叠片装置，用于制造如权利要求1所述的电芯，其中，所述叠片装置包括：
    第一放料机构，包括设置为供给所述第一极性带料(10)的第一放料辊(1)；
    隔膜供料机构，包括设置为供给所述第一隔膜带料(30)的第一隔膜辊(41)和设置为供给所述第二隔膜带料(40)的第二隔膜辊(42)，所述第一隔膜辊(41)和所述第二隔膜辊(42)分别设置在所述第一极性带料(10)的两侧，以使所述第一隔膜带料(30)与所述第二隔膜带料(40)覆盖在所述第一极性带料(10)的两侧；
    第二放料机构，置于所述第一隔膜带料(30)相背于所述第一极性带料(10)的一侧，设置为向所述第一隔膜带料(30)上供给所述第二极性片(20)；
    第三放料机构，置于所述第二隔膜带料(40)相背于所述第一极性带料(10)的一侧，设置为向所述第二隔膜带料(40)上供给所述第二极性片(20)；
    热合机构(6)，所述热合机构(6)包括压合组件和两组加热组件(61)，两组所述加热组件(61)分别置于所述压合组件的上游且分别设置为加热所述第一隔膜带料(30)和所述第二隔膜带料(40)，所述压合组件设置为压合叠放的所述第一极性带料(10)、所述第一隔膜带料(30)、所述第二隔膜带料(40)和所述第二极性片(20)以形成所述电池极片带料(100)；及
    叠片机构(13)，置于所述热合机构(6)下游，并设置为将所述电池极片带料(100)折叠为Z型。
  3. 根据权利要求2所述的叠片装置，其中，所述第二放料机构包括设置为 供给第二极性带料(21)的第二放料辊(2)和第一裁切件(51)，所述第一裁切件(51)设置为裁切所述第二放料辊(2)放出的所述第二极性带料(21)以形成所述第二极性片(20)。
  4. 根据权利要求2所述的叠片装置，其中，所述第三放料机构包括设置为供给第二极性带料(21)的第三放料辊(3)和第二裁切件(52)，所述第二裁切件(52)设置为裁切所述第三放料辊(3)放出的所述第二极性带料(21)以形成所述第二极性片(20)。
  5. 根据权利要求2所述的叠片装置，其中，所述压合组件包括置于所述加热组件(61)下游的压合辊(62)，所述压合辊(62)平行且间隔设置有两个，两个所述压合辊(62)分别置于所述电池极片带料(100)的两侧。
  6. 根据权利要求5所述的叠片装置，还包括预压组件，所述预压组件包括两个平行且间隔设置的预压辊(11)，所述预压辊(11)置于所述加热组件(61)和所述压合辊(62)之间，所述预压辊(11)设置为压合叠放所述第一极性带料(10)、所述第一隔膜带料(30)和所述第二隔膜带料(40)。
  7. 根据权利要求2所述的叠片装置，还包括驱动机构(12)，所述驱动机构(12)置于所述热合机构(6)与所述叠片机构(13)之间。
  8. 根据权利要求2所述的叠片装置，还包括剔废件(7)，所述剔废件(7)设置为剔除所述电池极片带料(100)上的废料。
  9. 根据权利要求8所述的叠片装置，还包括图像采集件(8)，所述图像采集件(8)位于所述剔废件(7)与所述热合机构(6)之间，所述图像采集件(8)设置有两个，两个所述图像采集件(8)分别置于所述电池极片带料(100)的两侧，以采集所述电池极片带料(100)的两侧的图像。
  10. 根据权利要求8所述的叠片装置，还包括切割件(9)，所述切割件(9)置于所述叠片机构(13)与所述剔废件(7)之间，所述切割件(9)设置为切断所述电池极片带料(100)。
PCT/CN2022/078009 2021-02-26 2022-02-25 电芯及叠片装置 WO2022179621A1 (zh)

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