WO2024016226A1 - 补锂装置和补锂方法 - Google Patents

补锂装置和补锂方法 Download PDF

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Publication number
WO2024016226A1
WO2024016226A1 PCT/CN2022/106832 CN2022106832W WO2024016226A1 WO 2024016226 A1 WO2024016226 A1 WO 2024016226A1 CN 2022106832 W CN2022106832 W CN 2022106832W WO 2024016226 A1 WO2024016226 A1 WO 2024016226A1
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WO
WIPO (PCT)
Prior art keywords
lithium
roller
pole piece
calendering
belt
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PCT/CN2022/106832
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English (en)
French (fr)
Inventor
谢斌
卢毅
蔡春辉
费新路
陈仕通
李克强
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/106832 priority Critical patent/WO2024016226A1/zh
Publication of WO2024016226A1 publication Critical patent/WO2024016226A1/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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M4/04—Processes of manufacture in general

Definitions

  • the present application relates to the field of battery technology, and in particular, to a lithium replenishing device and a lithium replenishing method.
  • battery performance is an issue that cannot be ignored.
  • Battery performance not only affects the development and application of battery-related products, but also affects consumer acceptance of electric vehicles.
  • the battery can be replenished with lithium to supplement the loss of active lithium during the use of the battery and extend the service life of the battery. It can also supplement the loss of active lithium during the first charging process and improve the energy density of the battery. . Therefore, how to replenish lithium efficiently in batteries has become a problem that needs to be solved.
  • the present application provides a lithium replenishing device and a lithium replenishing method, which can efficiently replenish lithium for the battery.
  • a lithium replenishing device including: a plurality of calendering devices for transferring lithium on a plurality of lithium belts to a plurality of first areas distributed along a first direction on a coating device, said The first direction is the width direction of the first pole piece to be replenished with lithium; the coating device is used to coat the lithium in the plurality of first regions on the first pole piece and the plurality of first pole pieces respectively.
  • a plurality of second areas corresponding to the first areas and a cutting device configured to cut the first pole piece according to the plurality of second areas to form a plurality of cut second areas. Extreme piece.
  • the lithium on multiple lithium strips is simultaneously transferred to multiple first areas distributed along the width direction of the pole piece by the coating device through multiple rolling devices, and the multiple first areas are transferred through the coating device.
  • the lithium in the area is transferred to the corresponding second areas on the first pole piece, and then the cutting device cuts the first pole piece based on the plurality of second areas, thereby forming a plurality of cut second pole pieces. Since multiple second pole pieces after lithium replenishment are formed at the same time, the lithium replenishment efficiency is greatly improved.
  • the calendering device includes a calendering roller
  • the coating device includes a fast roller
  • the lithium belt is used to pass between the fast roller and the calendering roller, so that the lithium belt The lithium on the roller is transferred to the first area on the fast roller corresponding to the lithium belt.
  • a roller system is used to transfer lithium on the lithium belt to a coating device, where the calendering device includes a calendering roller, and the coating device includes a fast roller.
  • the lithium belt is moved from When the fast roller and the calendering roller pass by, the lithium on each lithium belt is transferred to the first area on the fast roller corresponding to the lithium belt, which is easy to implement and has high reliability.
  • a protective belt is provided between the lithium belt and the calendering roller, and the protective belt and the lithium belt pass between the fast roller and the calendering roller at the same time.
  • a belt is used to isolate the lithium belt from the calendering roller.
  • the protective tape can protect the lithium belt from being damaged when it passes between the fast roller and the calendering roller.
  • the material of the protective tape is polyethylene terephthalate (PET), which is easy to obtain and has low cost.
  • the calendering device further includes a back roller, the calender roller is located between the back roller and the fast roller, and the back roller is used to provide the calender roller with a direction facing the fast roller. of support.
  • the size of the calendering roller is usually smaller than the size of the fast roller, when the calendering roller and the fast roller move relative to each other, the side of the calendering roller facing the fast roller will bear greater pressure, which can easily cause damage to the calendering roller and affect its service life.
  • a back roller to provide the calendering roller with support toward the fast roller, the pressure exerted by the fast roller on the calendering roller can be balanced, thereby protecting the calendering roller.
  • the calendering device further includes a scraper, the scraper being used to control the width of the lithium in the first area on the fast roller in the first direction. Through the scraper, the width of the lithium in the first area on the fast roller can be accurately controlled to match the width of the corresponding second pole piece.
  • the coating device further includes a laminating roller, and the first pole piece is used to pass between the fast roller and the laminating roller to cover all the particles on the fast roller.
  • the lithium in the first region is coated on the second region corresponding to the first region on the first pole piece.
  • a roller system is used to transfer lithium on the coating device to the first pole piece.
  • the coating device also includes a laminating roller arranged opposite to the fast roller. Through the relative movement between the laminating roller and the fast roller, The first pole piece is used to pass between the fast roller and the laminating roller to coat the lithium in the first area on the fast roller on the second area on the first pole piece corresponding to the first area, which is easy to implement, And high reliability.
  • At least part of the second areas among the plurality of second areas have different widths in the first direction.
  • the lithium replenishment device of the embodiment of the present application can simultaneously form multiple second pole pieces with different widths after lithium replenishment, and has greater applicability.
  • the lithium replenishing device includes a first sub-device and a second sub-device, each of the first sub-device and the second sub-device including the plurality of calendering devices and the Coating device, the first sub-device is used to coat the plurality of second areas on the first surface of the first pole piece with lithium, the second sub-device is used to coat lithium on the first surface of the first pole piece The plurality of second regions on the second surface of the sheet are coated with lithium.
  • the two surfaces of the first pole piece are replenished with lithium successively, thereby enhancing the lithium replenishing effect of the second pole piece.
  • the slitting device includes a mechanical cutter or a laser cutter, and the mechanical cutter or laser cutter is used to slit the first pole piece, which is easy to operate and has high reliability.
  • the lithium replenishing device further includes a plurality of winding devices, respectively used to wind a plurality of second pole pieces after replenishing lithium.
  • the winding of multiple second pole pieces is completed through multiple winding devices, which is easy to operate and has high reliability.
  • a lithium replenishing method which includes: transferring lithium on multiple lithium belts to multiple first areas distributed along a first direction on a coating device through multiple rolling devices, and the third One direction is the width direction of the first pole piece to be replenished with lithium; through the coating device, the lithium in the plurality of first regions is coated on the first pole piece and the plurality of first pole pieces respectively. and a plurality of second regions corresponding to each first region; the first pole piece is slit according to the plurality of second regions by a slitting device to form a plurality of slit second pole pieces.
  • the calendering device includes a calendering roller
  • the coating device includes a fast roller
  • the lithium on the multiple lithium belts is respectively transferred to a plurality of lithium strips distributed along the first direction on the coating device.
  • the first area includes: passing the lithium belt between the fast roller and the calendering roller, so that the lithium on the lithium belt is transferred to the corresponding part of the lithium belt on the fast roller. First area.
  • a protective belt is provided between the lithium belt and the calendering roller, and passing the lithium belt between the fast roller and the calendering roller includes: passing the protective belt The belt and the lithium belt pass between the fast roller and the calendering roller at the same time, and the protective belt is used to isolate the lithium belt and the calendering roller.
  • the protective tape is made of PET.
  • the calendering device further includes a scraper
  • the method further includes: using the scraper, controlling the width of the lithium in the first area on the fast roller in the first direction.
  • the coating device further includes a laminating roller, and the lithium in the plurality of first areas is respectively coated on the first pole piece corresponding to the plurality of first areas.
  • a plurality of second areas including: passing the first pole piece between the fast roller and the laminating roller to coat the lithium in the first area on the fast roller on The second area on the first pole piece corresponds to the first area.
  • At least part of the second areas among the plurality of second areas have different widths in the first direction.
  • the method further includes: using multiple winding devices to respectively wind up multiple second pole pieces after replenishing lithium.
  • Figure 1 is a schematic block diagram of a lithium supplement device according to an embodiment of the present application.
  • FIG 2 is a schematic structural diagram of a possible implementation of the lithium replenishment device shown in Figure 1;
  • Figure 3 is a schematic diagram of the relative position between the calendering roller and the fast roller
  • Figure 4 is a schematic diagram of the relative position between the calendering roller and the fast roller
  • Figure 5 is a schematic diagram of the relative position between the calendering roller and the fast roller
  • Figure 6 is a schematic diagram of the relative position between the calendering roller and the fast roller
  • Figure 7 is a schematic diagram of the relative position between the calendering roller and the fast roller
  • Figure 8 is a schematic diagram of the relative position between the calendering roller and the fast roller
  • Figure 9 is a schematic flow chart of the lithium supplement method according to the embodiment of the present application.
  • the battery in the embodiment of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell may include an electrode assembly and an electrolyte.
  • the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the current collector that is not coated with the positive electrode active material layer protrudes from the current collector that is coated with the positive electrode active material layer.
  • the current collector coated with the positive electrode active material layer serves as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the current collector that is not coated with the negative electrode active material layer protrudes from the current collector that is coated with the negative electrode active material layer.
  • the current collector coated with the negative active material layer serves as the negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be graphite, carbon or silicon.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the separator can be polypropylene (PP) or polyethylene (polyethylene, PE).
  • the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.
  • SEI solid electrolyte interphase
  • the positive electrode The irreversible consumption of lithium ions usually exceeds 10%, resulting in low first-cycle charge and discharge efficiency, thereby reducing the energy density of the battery.
  • the battery will continue to consume active lithium during normal use, resulting in a greatly reduced battery life.
  • replenishing lithium in the battery it can not only replenish the loss of active lithium during use of the battery including the battery cell, improve the service life of the battery, but also replenish the loss of active lithium during the first charging process of the battery. , improve the energy density of the battery, thereby effectively improving the performance of the battery.
  • this application proposes a lithium replenishment solution, which simultaneously transfers the lithium on multiple lithium belts to different areas of the coating device through multiple calendering devices, and transfers the lithium in different areas to the third through the coating device. Different areas of one pole piece are then cut to form multiple second pole pieces after lithium replenishment. Since multiple second pole pieces after lithium replenishment can be obtained at the same time, the lithium replenishment efficiency is greatly improved.
  • Electrical devices may be, for example, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.
  • spacecraft include aircraft, rockets, space shuttles, spaceships, etc.
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • Electric drills Electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • FIG. 1 shows a schematic block diagram of a lithium supplement device according to an embodiment of the present application.
  • the lithium replenishing device 100 includes a plurality of rolling devices 110 , a coating device 120 and a cutting device 130 .
  • the plurality of rolling devices 110 are used to transfer the lithium on the plurality of lithium belts 200 to a plurality of first areas 1211 distributed along the first direction X on the coating device 120.
  • the first direction The width direction of the first lithium pole piece 210.
  • the coating device 120 is used to apply lithium in the plurality of first regions 1211 to the plurality of second regions 1221 corresponding to the plurality of first regions 1211 on the first pole piece 210 .
  • the cutting device 130 is used to cut the first pole piece 210 according to the plurality of second regions 1221 to form a plurality of cut second pole pieces 220 .
  • the plurality of first regions 1211 are a plurality of regions distributed along the first direction X on the coating device 120
  • the plurality of second regions 1221 are a plurality of regions distributed along the first direction X on the first pole piece 210.
  • the lithium on each first area 1211 on the cloth device 120 is coated on the corresponding second area 1221 on the first pole piece 210 .
  • the first direction X is the width direction of the first pole piece 210 , that is, the width direction of the first pole piece 210 .
  • the first pole piece 210 is a very wide pole piece.
  • the plurality of second regions 1221 on the first pole piece 210 are coated with lithium at the same time, multiple plurality of second regions 1221 corresponding to the plurality of second regions 1221 are formed by cutting.
  • lithium on multiple lithium strips 200 is simultaneously transferred through multiple rolling devices 110 to multiple first areas 1211 distributed along the pole piece width direction X of the coating device 120, and passed through the coating device 120 transfer the lithium in the plurality of first regions 1211 to the corresponding plurality of second regions 1221 on the first pole piece 210, and then the cutting device 130 cuts the first pole piece 210 based on the plurality of second regions 1221, Thus, a plurality of slit second pole pieces 220 are formed. Since multiple second pole pieces 220 after lithium replenishment are formed at the same time, the lithium replenishment efficiency is greatly improved.
  • the calendering device 110 includes a calendering roller 111
  • the coating device 120 includes a fast roller 121
  • the lithium belt 200 is used to pass between the fast roller 121 and the calendering roller 111 to transfer lithium on the lithium belt 200 to the first area 1211 on the fast roller 121 corresponding to the lithium belt 200 .
  • a roller system is used to transfer lithium on the lithium belt 200 to the coating device 120 , wherein the calendering device 110 includes a calendering roller 111 , and the coating device 120 includes a fast roller 121 , passing between the calendering roller 111 and the fast roller 121
  • the relative movement of the lithium belt 200 causes the lithium belt 200 to pass through the fast roller 121 and the calendering roller 111, thereby transferring the lithium on each lithium belt 200 to the first area 1211 on the fast roller 121 corresponding to the lithium belt 200, which is easy to implement and reliable. High sex.
  • the coating device 120 further includes a laminating roller 122 , and the first pole piece 210 is used to pass between the fast roller 121 and the laminating roller 122 to convert the first area 1211 on the fast roller 121 Lithium is coated on the second region 1221 corresponding to the first region 1211 on the first pole piece 210 .
  • a roller system is used to transfer lithium on the coating device 120 to the first pole piece 210.
  • the coating device 120 also includes a laminating roller 122 arranged opposite to the fast roller 121. Through the laminating roller 122 and the fast roller The relative movement between 121 allows the first pole piece 210 to pass between the fast roller 121 and the laminating roller 122 to coat the lithium in the first area 1211 on the fast roller 121 on the first pole piece 210
  • the second area 1221 corresponding to the first area 1211 is easy to implement and has high reliability.
  • FIG. 2 is a schematic structural diagram of a possible implementation of the lithium replenishment device 100 shown in FIG. 1.
  • the calendering device 110 includes a calendering roller 111
  • the coating device 120 includes a fast roller 121 and a coating. Closing roller 122.
  • a plurality of calendering rollers 111 are arranged around the fast roller 121 and are staggered in the first direction X, that is, the roller surfaces of each calendering roller 111 do not overlap in the first direction X.
  • the lithium belt 200 passes between the fast roller 121 and the calendering roller 111 , the lithium on the lithium belt 200 will be transferred to the first area 1211 on the fast roller 121 corresponding to the lithium belt 200 .
  • the size of the calendering roller 111 is smaller than the size of the fast roller 121.
  • the diameter of the calendering roller 111 is smaller than the diameter of the fast roller 121, and the size of the calendering roller 11 along the first direction size. In this way, when the calendering roller 111 and the fast roller 121 move relative to each other, the side of the calendering roller 111 facing the fast roller 121 will bear greater pressure, which may easily cause wear to the calendering roller 111 and affect its service life.
  • the calendering device 110 may also include a back roller 112 , the calender roller 111 is located between the back roller 112 and the fast roller 121 , and the back roller 112 is used to provide the calender roller 111 with The supporting force towards the fast roller 121.
  • the pressure exerted by the fast roller 121 on the calendering roller 111 can be balanced, thereby protecting the calendering roller 111.
  • Multiple rolling devices 110 are shown in FIG. 2 , in order to illustrate more clearly how the lithium on the multiple lithium belts 200 is simultaneously transferred to the multiple second areas 1221 on the first pole piece 210 through the multiple rolling devices 110 . , below, a detailed description will be given with reference to Figures 3 to 7 .
  • Figure 3 shows the situation where there is only one rolling device 110, which can realize “one out, one out", that is, after sending a first pole piece 210 into the lithium replenishing device 100, only one second pole piece 220 is sent out;
  • Figure 4 shows Except for the situation where two rolling devices 110 are provided, “one out of two” can be realized, that is, one first pole piece 210 is sent into the lithium replenishing device 100 and two second pole pieces 220 are sent out;
  • Figures 5 and 6 show When three rolling devices 110 are provided, “one out of three” can be realized, that is, one first pole piece 210 is sent into the lithium replenishing device 100 and three second pole pieces 220 are sent out;
  • Figure 7 shows that four rolling devices are provided. In the case of 110, "one out of four” can be realized, that is, one first pole piece 210 is sent into the lithium replenishing device 100 and four second pole pieces 220 are sent out.
  • Figure 3 is a schematic diagram of the relative positions of the rolling device 110 and the coating device 120 in the lithium replenishing device 100 shown in Figure 2, wherein (a) in Figure 3 is the rolling device 11 and the coating device (b) is a top view of the side view of the device 120, and (c) is a schematic view of the surface of the first pole piece 210 facing the rolling device 110.
  • the calendering device 110 includes a calendering roller 111 and a backing roller 112
  • the coating device 120 includes a fast roller 121 and a laminating roller 122 .
  • the fast roller 121 and the calendering roller 111 are arranged oppositely along the Y direction, and the Y direction is perpendicular to the first direction X, which is the width direction of the first pole piece 210 .
  • the lithium belt 200 passes between the fast roller 121 and the calendering roller 111 , the lithium on the lithium belt 200 is transferred to the first area 1211 of the fast roller 121 .
  • the first pole piece 210 passes between the fast roller 121 and the laminating roller 122
  • the lithium in the first area 1211 on the fast roller 121 is transferred to the second area on the first pole piece 210 corresponding to the first area 1211 .
  • Area 1221 Area 1221.
  • FIG. 4 adds two rolling devices 110 .
  • (a) in FIG. 4 is a side view of the rolling device 110 and the coating device 120
  • (b) is a top view
  • (c) is a schematic view of the surface of the first pole piece 210 facing the rolling device 110.
  • two calender rollers 111 are respectively provided on both sides of the fast roller 121 along the Y direction, and the two calender rollers 111 are staggered in the first direction X.
  • One lithium belt 200 passes between the fast roller 121 and one calendering roller 111, and the other lithium belt 200 passes between the fast roller 121 and another calendering roller 111.
  • the lithium on the two lithium belts 200 can be At the same time, it is transferred to the two first areas 1211 arranged along the first direction Fill to distinguish. Then, when the first pole piece 210 passes between the fast roller 121 and the laminating roller 122 from left to right, the lithium on the first area 1211A of the fast roller 121 is transferred to the first pole piece 210 and the first area 1211A. Corresponding to the second area 1221A, lithium on the first area 1211B of the fast roller 121 is transferred to the second area 1221B on the first pole piece 210 corresponding to the first area 1211B.
  • FIG. 5 adds three rolling devices 110 .
  • 5 (a) is a side view of the rolling device 110 and the coating device 120, (b) is a top view, and (c) is a schematic view of the surface of the first pole piece 210 facing the rolling device 110.
  • two calender rollers 111 are respectively provided on both sides of the fast roller 121 along the Y direction, and another calender roller 111 is provided on one side of the fast roller 121 along the first direction X.
  • the three calendering rollers 111 are staggered in the first direction X.
  • the lithium belt 200 passes between the fast roller 121 and each calendering roller 111, so that the lithium on the lithium belt 200 is simultaneously transferred to three first areas 1211 of the fast roller 121 arranged along the first direction X, including the first area. 1211A, the first area 1211B and the first area 1211C.
  • the first area 1211A, the first area 1211B and the first area 1211C are filled with different line patterns for distinction.
  • the first pole piece 210 passes between the fast roller 121 and the laminating roller 122 from left to right, the lithium on the first area 1211A on the fast roller 121 is transferred to the first pole piece 210 and the first area.
  • the lithium in the second area 1221A corresponding to 1211A and the first area 1211B on the fast roller 121 is transferred to the second area 1221B on the first pole piece 210 corresponding to the first area 1211B and the first area 1211C on the fast roller 121 of lithium is transferred to the second region 1221C on the first pole piece 210 corresponding to the first region 1211C.
  • FIG. 6 adds three rolling devices 110 .
  • the difference between Figure 6 and Figure 5 is that the relative positions of the three calendering rollers 111 are different.
  • (a) in FIG. 6 is a side view of the rolling device 110 and the coating device 120
  • (b) is a top view
  • (c) is a schematic view of the surface of the first pole piece 210 facing the rolling device 110.
  • on both sides of the fast roller 121 along the Y direction one side is provided with a calendering roller 111 , and the other side is provided with two calendering rollers 111 .
  • the three calendering rollers 111 are staggered in the first direction X.
  • the lithium belt 200 passes between the fast roller 121 and each calendering roller 111, so that the lithium on the lithium belt 200 is simultaneously transferred to three first areas 1211 of the fast roller 121 arranged along the first direction X, including the first area. 1211A, the first area 1211B and the first area 1211C.
  • the first area 1211A, the first area 1211B and the first area 1211C are filled with different line patterns for distinction.
  • the first pole piece 210 passes between the fast roller 121 and the laminating roller 122 from left to right, the lithium on the first area 1211A of the fast roller 121 is transferred to the first pole piece 210 and the first area 1211A.
  • the lithium on the corresponding second area 1221A and the first area 1211B of the fast roller 121 is transferred to the second area 1221B on the first pole piece 210 corresponding to the first area 1211B, and the lithium on the first area 1211C of the fast roller 121 is transferred. to the second area 1221C on the first pole piece 210 corresponding to the first area 1211C.
  • FIG. 7 adds four rolling devices 110 .
  • (a) in FIG. 7 is a side view of the rolling device 110 and the coating device 120
  • (b) is a top view
  • (c) is a schematic view of the surface of the first pole piece 210 facing the rolling device 110.
  • two calendering rollers 111 are provided on one side
  • two calendering rollers 111 are provided on the other side.
  • the four calendering rollers 111 are staggered in the first direction X.
  • the lithium belt 200 passes between the fast roller 121 and each calendering roller 111, so that the lithium on the lithium belt 200 is simultaneously transferred to three first areas 1211 of the fast roller 121 arranged along the first direction X, including the first area. 1211A, the first area 1211B, and the first area 1211C.
  • the first area 1211A, the first area 1211B, the first area 1211C, and the first area 1211D are filled with different line patterns for distinction.
  • the first pole piece 210 passes between the fast roller 121 and the laminating roller 122 from left to right, the lithium on the first area 1211A of the fast roller 121 is transferred to the first pole piece 210 and the first area 1211A.
  • the lithium on the corresponding second area 1221A and the first area 1211B of the fast roller 121 is transferred to the second area 1221B on the first pole piece 210 corresponding to the first area 1211B, and the lithium on the first area 1211C of the fast roller 121 is transferred.
  • the lithium on the first area 1211D of the fast roller 121 is transferred to the second area 1221D on the first pole piece 210 corresponding to the first area 1211D.
  • FIG. 3 to FIG. 7 are only examples, and the relative positions between the plurality of calendering rollers 111 and the fast roller 121 may also have other implementations.
  • the number of calendering rollers 111 may also be larger.
  • a protective belt 210 is provided between the lithium belt 200 and the calendering roller 111.
  • the protective belt 210 and the lithium belt 200 pass between the fast roller 121 and the calendering roller 111 at the same time.
  • the protective belt 210 is used to isolate the lithium belt 200 and the calendering roller 111.
  • the protective belt 210 can protect the lithium belt 200 and prevent the lithium belt 200 from being damaged when passing between the fast roller 121 and the calendering roller 111 .
  • the material of the protective tape 210 is, for example, polyethylene terephthalate (PET), which is easy to obtain and has low cost.
  • the calendering device 110 further includes a scraper 140 , which is used to control the width of the lithium in the first region 1211 on the fast roller 111 in the first direction X.
  • a scraper 140 Through the scraper 140, the width of the lithium in the first area 1211 on the fast roller 11 can be accurately controlled to match the width of the corresponding second pole piece 220.
  • the width of the lithium in the first region 1211A, the first region 1211B, the first region 1211C and the first region 1211D in the first direction X can be controlled by the scraper 140 .
  • the corresponding scraper 140 can scrape off the lithium outside the width W during the rotation of the fast roller 121, leaving a width of W of lithium makes the width of the lithium transferred to the second region 1221A of the first pole piece 210 corresponding to the first region 1211A be W, thereby matching the width of the second pole piece 220 corresponding to the second region 1221A.
  • the second areas 1221 among the plurality of second areas 1221 have different widths in the first direction X. That is to say, the widths of the plurality of second regions 1221 in the first direction X may be the same, or may be partially or completely different.
  • the widths of the first region 1211A, the first region 1211B, the first region 1211C and the first region 1211D in the first direction X may be the same or different.
  • the widths of the second area 1221A, the second area 1221B, the second area 1221C and the second area 1221D on the first pole piece 210 are also different. After being cut by the cutting device 130, different widths can be formed. a plurality of second pole pieces 220.
  • the lithium replenishing device 100 of the embodiment of the present application can simultaneously form a plurality of lithium replenished second pole pieces 220 with different widths, the applicability is stronger.
  • the lithium replenishing device 100 includes a first sub-device 101 and a second sub-device 102.
  • Each of the first sub-device 101 and the second sub-device 02 includes the aforementioned plurality of calendering devices 110 and coating devices.
  • Device 120, the first sub-device 101 is used to coat a plurality of second areas 1221 with lithium on the first surface 210A of the first pole piece 210, and the second sub-device is used to coat the second surface 210B of the first pole piece 210 with lithium.
  • a plurality of second regions 1221 are coated with lithium.
  • the lithium replenishment device 100 includes two sets of sub-devices, namely a first sub-device 101 and a second set of sub-devices 102.
  • the first sub-device 101 is used to replenish the first surface 210A of the first pole piece 210.
  • the second sub-device 102 is used to replenish lithium on the second surface 210B of the first pole piece 210 .
  • the process of replenishing lithium by the second sub-device 102 on the second surface 210B of the first pole piece 210 is similar to the process of replenishing lithium by the first sub-device 101 on the first surface 210A of the first pole piece 210.
  • we won’t go into details here.
  • lithium is replenished on both surfaces of the first pole piece 210 one after another, thereby enhancing the lithium replenishing effect on the second pole piece 220 .
  • both surfaces of the first pole piece 210 are replenished with lithium, they are cut by the cutting device 130 to form a plurality of second pole pieces 220 .
  • the first pole piece 210 Since lithium is formed simultaneously on the plurality of second regions 1221 of the large first pole piece 210, the first pole piece 210 needs to be slit based on the plurality of second regions 1221 by the slitting device 130. A plurality of slit second pole pieces 220 are formed.
  • the slitting device 130 includes, for example, a mechanical cutter or a laser cutter.
  • the mechanical cutter or laser cutter is used to slit the first pole piece 210 , which is easy to operate and has high reliability.
  • FIG. 8 takes a circular cutter as an example. The circular cutter cuts the first pole piece 210 based on the plurality of second regions 1221 to form a plurality of second pole pieces 220 corresponding to the plurality of second regions. .
  • Each cut second pole piece 220 may also be subjected to other processing to form parts such as pole tabs.
  • the pole tabs are formed in areas of the second pole piece 220 that are not coated with lithium.
  • the electrode assembly is then formed by, for example, winding or lamination.
  • the lithium replenishing device 100 further includes an unwinding device 150 for releasing the first pole piece 210 .
  • the unwinding device 150 may be, for example, an unwinding roller 150 .
  • the lithium replenishing device 100 further includes a plurality of winding devices 160 , respectively used to wind a plurality of second pole pieces 220 after replenishing lithium.
  • the winding device 160 may be, for example, a winding roller 160 .
  • the unwinding device 150 and the plurality of winding devices 160 Through the unwinding device 150 and the plurality of winding devices 160, the unwinding of the first pole piece 210 and the winding of the plurality of second pole pieces 220 are respectively completed, which is easy to operate and has high reliability.
  • the relative positions between the multiple calender rollers 111 and the fast roller 121 are reasonably set to simultaneously form multiple second pole pieces 220 after lithium replenishment, which greatly improves the lithium replenishment efficiency.
  • the lithium filling and cutting of the large and wide first pole piece 210 are integrated, further increasing the production capacity and reducing the cost investment.
  • FIG. 9 shows a lithium supplement method 300 according to an embodiment of the present application.
  • the lithium replenishment method 300 can be performed by the above-mentioned lithium replenishment device 100.
  • the method 100 includes some or all of the following steps.
  • step 310 the lithium on the plurality of lithium belts 200 is transferred to a plurality of first areas 1211 distributed along the first direction X on the coating device 120 through the plurality of rolling devices 110.
  • the first direction The width direction of the first pole piece 210 that is replenished with lithium.
  • step 320 the coating device 120 is used to apply lithium in the plurality of first regions 1211 to the plurality of second regions 1221 corresponding to the plurality of first regions 1211 on the first pole piece 210 .
  • step 330 the cutting device 130 is used to cut the first pole piece 210 according to the plurality of second regions 1221 to form a plurality of cut second pole pieces 220 .
  • the calendering device 110 includes a calendering roller 111
  • the coating device 120 includes a fast roller 121, which transfers the lithium on the plurality of lithium belts 200 to the plurality of lithium belts distributed along the first direction X on the coating device 120.
  • a first area 1211 includes: passing the lithium belt 200 between the fast roller and the calendering roller 111, so that the lithium on the lithium belt 200 is transferred to the first area 1211 on the fast roller 121 corresponding to the lithium belt 200.
  • a protective belt 210 is disposed between the lithium belt 200 and the calendering roller 111. Passing the lithium belt 200 between the fast roller 121 and the calendering roller 111 includes: simultaneously passing the protective belt 210 and the lithium belt 200 from The protective belt 210 passes between the fast roller 121 and the calendering roller 111, and is used to isolate the lithium belt 200 from the calendering roller 111.
  • the material of the protective tape 210 is PET.
  • the calendering device 110 further includes a scraper 140, and the method further includes: controlling the width of the first area 1211 on the fast roller in the first direction X through the scraper 140.
  • the coating device 120 further includes a laminating roller 122 to apply lithium in the plurality of first regions 1211 on the first pole piece 210 corresponding to the plurality of first regions 1211 .
  • the second area 1221 includes: passing the first pole piece 210 between the fast roller and the laminating roller 122 to coat the lithium in the first area 1211 on the fast roller 121 on the first pole piece 210 and the first The second area 1221 corresponding to area 1211.
  • At least some of the second areas 1221 among the plurality of second areas 1221 have different widths in the first direction X.
  • the method 300 further includes: respectively winding the plurality of second pole pieces 220 after replenishing lithium through the plurality of winding devices 160 .
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Abstract

本申请提供一种补锂装置和补锂方法，能够高效地对电池进行补锂。所述补锂装置包括：多个压延装置，用于将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，所述第一方向为待补锂的第一极片的幅宽方向；所述涂布装置，用于将所述多个第一区域的锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域；以及，分切装置，用于根据所述多个第二区域，对所述第一极片进行分切，以形成多个分切后的第二极片。

Description

补锂装置和补锂方法 技术领域
本申请涉及电池技术领域，特别地，涉及一种补锂装置和补锂方法。
背景技术
节能减排是汽车产业可持续发展的关键。在这种情况下，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。而对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
在电池技术的发展中，电池的性能是一个不可忽视的问题。电池的性能不仅影响电池电池相关产品的发展和应用，而且还影响消费者对电动车辆的接受度。通常，可以通过对电池进行补锂，补充电池在使用过程中的活性锂的损耗，提高电池的使用寿命，并且还能补充电池在首次充电过程中的活性锂的损失，提高了电池的能量密度。因此，如何高效地对电池进行补锂，成为需要解决的问题。
发明内容
本申请提供一种补锂装置和补锂方法，能够高效地对电池进行补锂。
第一方面，提供一种补锂装置，包括：多个压延装置，用于将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，所述第一方向为待补锂的第一极片的幅宽方向；所述涂布装置，用于将所述多个第一区域的锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域；以及，分切装置，用于根据所述多个第二区域，对所述第一极片进行分切，以形成多个分切后的第二极片。
本申请实施例中，通过多个压延装置同时将多个锂带上的锂分别转移至涂布装置沿极片幅宽方向分布的多个第一区域，并通过涂布装置将多个第一区域的锂转移至第一极片上对应的多个第二区域上，之后分切装置基于多个第二区域对第一极片进行分切，从而形成分切后的多个第二极片。由于同时形成补锂后的多个第二极片，因此极大地提高了补锂效率。
在一种实现方式中，所述压延装置包括压延辊，所述涂布装置包括快辊，所述锂带用于从所述快辊和所述压延辊之间经过，以使所述锂带上的锂转移至所述快辊上与所述锂带对应的所述第一区域。
该实施例中，利用辊系将锂带上的锂转移至涂布装置，其中压延装置包括压延辊，涂布装置包括快辊，通过压延辊和快辊之间的相对运动，使锂带从快辊和压延辊经过时，将每个锂带上的锂转移至快辊上与该锂带对应的第一区域，易于实现，且可靠性高。
在一种实现方式中，所述锂带与所述压延辊之间设置有保护带，所述保护带与所述锂带同时从所述快辊和所述压延辊之间经过，所述保护带用于隔离所述锂带与所述压延辊。该保护带可以对锂带形成保护，避免锂带从快辊和压延辊之间经过时受到损伤。
在一种实现方式中，所述保护带的材料为聚对苯二甲酸乙二醇酯(PET)，易于获取，且成本低。
在一种实现方式中，所述压延装置还包括背辊，所述压延辊位于所述背辊和所述快辊之间，所述背辊用于向所述压延辊提供朝向所述快辊的支撑力。
由于通常压延辊的尺寸小于快辊的尺寸，当压延辊和快辊之间相对运动时，压延辊朝向快辊的一侧会承受较大的压力，容易对压延辊造成损耗，影响其使用寿命，通过增加背辊，向压延辊提供朝向快辊的支撑力，可以平衡快辊向压延辊施加的压力，从而对压延辊形成保护。
在一种实现方式中，所述压延装置还包括刮刀，所述刮刀用于控制所述快辊上的所述第一区域的锂在所述第一方向上的宽度。通过刮刀，可以精准地在控制快辊上的该第一区域的锂的宽度，以匹配对应的第二极片的幅宽。
在一种实现方式中，所述涂布装置还包括覆合辊，所述第一极片用于从所述快辊和所述覆合辊之间经过，以将所述快辊上的所述第一区域的锂，涂布在所述第一极片上与所述第一区域对应的所述第二区域。
该实施例中，利用辊系将涂布装置上的锂转移至第一极片，涂布装置还包括与快辊相对设置的覆合辊，通过覆合辊和快辊之间的相对运动，使第一极片用于从快辊和覆合辊之间经过，以将快辊上的第一区域的锂，涂布在第一极片上与第一区域对应的第二区域，易于实现，且可靠性高。
在一种实现方式中，所述多个第二区域中的至少部分第二区域在所述第一方向上的宽度不同。本申请实施例的补锂装置可以同时形成对幅宽不同的补锂后的多个第二极片，适用性更强。
在一种实现方式中，所述补锂装置包括第一子装置和第二子装置，所述第一子装置和所述第二子装置中的每个包括所述多个压延装置和所述涂布装置，所述第一子装置用于在所述第一极片的第一表面上的所述多个第二区域涂布锂，所述第二子装置用于在所述第一极片的第二表面上的所述多个第二区域涂布锂。
通过设置两套子装置，先后对第一极片的两个表面进行补锂，增强了对第二极片的补锂效果。
由于是在大幅宽的第一极片的多个第二区域上涂布锂，因此后续需要基于多个第二区域对第一极片进行分切，以形成分切后的多个第二极片。在一种实现方式中，所述分切装置包括机械切刀或者激光切刀，通过机械切刀或者激光切刀对第一极片进行分切，易于操作，且可靠性高。
在一种实现方式中，所述补锂装置还包括多个收卷装置，分别用于对多个补锂后的所述第二极片进行收卷。通过多个收卷装置完成对多个第二极片的收卷，操作简便，且可靠性高。
第二方面，提供一种补锂方法，包括：通过多个压延装置，将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，所述第一方向为待补锂的第一极片的幅宽方向；通过所述涂布装置，将所述多个第一区域的所述锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域；通过分切装置，根据所述多个第二区域，对所述第一极片进行分切，以形成多个分切后的第二极片。
在一种实现方式中，所述压延装置包括压延辊，所述涂布装置包括快辊，所述将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，包括：将所述锂带从所述快辊和所述压延辊之间经过，以使所述锂带上的所述锂转移至所述快辊上与锂带对应的所述第一区域。
在一种实现方式中，所述锂带与所述压延辊之间设置有保护带，所述将所述锂带从所述快辊和所述压延辊之间经过，包括：将所述保护带与所述锂带同时从所述快辊和所述压延辊之间经过，所述保护带用于隔离所述锂带与所述压延辊。
在一种实现方式中，所述保护带的材料为PET。
在一种实现方式中，所述压延装置还包括刮刀，所述方法还包括：通过所述刮刀，控制所述快辊上的所述第一区域的锂在所述第一方向上的宽度。
在一种实现方式中，所述涂布装置还包括覆合辊，所述将所述多个第一区域的锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域，包括：将所述第一极片从所述快辊和所述覆合辊之间经过，以将所述快辊上的所述第一区域的锂，涂布在所述第一极片上与所述第一区域对应的所述第二区域。
在一种实现方式中，所述多个第二区域中的至少部分第二区域在所述第一方向上的宽度不同。
在一种实现方式中，所述方法还包括：通过多个收卷装置，分别对多个补锂后的所述第二极片进行收卷。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1是本申请实施例的补锂装置的示意性框图；
图2是图1所示的补锂装置的一种可能的实现方式的结构示意图；
图3是压延辊和快辊之间的一种相对位置的示意图；
图4是压延辊和快辊之间的一种相对位置的示意图；
图5是压延辊和快辊之间的一种相对位置的示意图；
图6是压延辊和快辊之间的一种相对位置的示意图；
图7是压延辊和快辊之间的一种相对位置的示意图；
图8是压延辊和快辊之间的一种相对位置的示意图；
图9本申请实施例的补锂方法的示意性流程图。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即 本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
本申请的实施例中的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体可以包括电极组件和电解液，电极组件由正极片、负极片和隔离膜组成。电池单体主要依靠金属离子在正极片和负极片之间移动来工作。正极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的集流体凸出于已涂覆正极活性物质层的集流体，未涂敷正极活性物质层的集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的集流体凸出于已涂覆负极活性物质层的集流体，未涂敷负极活性物质层的集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为石墨、碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔膜的材质可以为聚丙烯(polypropylene，PP)或聚乙烯(polyethylene，PE)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构， 本申请实施例并不限于此。
电池，例如锂离子电池，目前存在的普遍问题是在首次充电过程中会消耗大量从正极脱出的锂离子，以形成负极表面的固体电解质界面(solid electrolyte interphase，SEI)膜，首次充电过程中正极锂离子的不可逆消耗通常会超过10％，致使首周期充放电效率较低，从而降低电池的能量密度。此外，电池在正常使用过程中也会持续消耗活性锂，导致电池的使用寿命大大减少。
通过对电池进行补锂，不仅可以补充包括有该电池单体的电池在使用过程中的活性锂的损耗，提高了电池的使用寿命，并且还能补充电池在首次充电过程中的活性锂的损失，提高电池的能量密度，从而有效提高电池的性能。
鉴于此，本申请提出一种补锂方案，通过多个压延装置同时将多个锂带上的锂转移至涂布装置的不同区域，并通过涂布装置将其不同区域的锂同转移至第一极片的不同区域，之后通过分切形成补锂后的多个第二极片，由于能够同时获得补锂后的多个第二极片，极大地提高了补锂效率。
本申请实施例描述的技术方案均适用于各种使用电池的用电设备。
用电设备例如可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电设备不做特殊限制。
图1示出了本申请实施例的补锂装置的示意性框图。如图1所示，补锂装置100包括多个压延装置110、涂布装置120和分切装置130。
其中，多个压延装置110用于将多个锂带200上的锂，分别转移至涂布装置120上沿第一方向X分布的多个第一区域1211，所述第一方向X为待补锂的第一极片210的幅宽方向。涂布装置120用于将多个第一区域1211的锂，分别涂布在第一极片210上与多个第一区域1211对应的多个第二区域1221。分切装置130用于根据多个第二区域1221，对第一极片210进行分切，以形成多个分切后的第二极片220。
这里，多个第一区域1211是涂布装置120上沿第一方向X分布的多个区域，多个第二区域1221是第一极片210上沿第一方向X分布的多个区域，涂布装置120上的每个第一区域1211上的锂涂布至第一极片210上对应的第二区域1221。第一方向X为第一极片210的幅宽方向，即第一极片210的宽度方向。
实际上，第一极片210为大幅宽的极片，当第一极片210上的多个第二区域1221上同时涂布锂后，通过分切形成与多个第二区域1221对应的多个第二极片220，其中，每个第二极片220包括其对应的补锂后的第二区域1221。
本申请实施例中，通过多个压延装置110同时将多个锂带200上的锂分别转移至涂布装置120沿极片幅宽方向X分布的多个第一区域1211，并通过涂布装置120将多个第一区域1211的锂转移至第一极片210上对应的多个第二区域1221上，之后分切装置130基于多个第二区域1221对第一极片210进行分切，从而形成分切后的多个第二极片220。由于同时形成补锂后的多个第二极片220，因此极大地提高了补锂效率。
在一种实现方式中，压延装置110包括压延辊111，涂布装置120包括快辊121，锂带200用于从快辊121和压延辊111之间经过，以使锂带200上的锂转移至快辊121上与锂带200对应的第一区域1211。
该实施例中，利用辊系将锂带200上的锂转移至涂布装置120，其中压延装置110包括压延辊111，涂布装置120包括快辊121，通过压延辊111和快辊121之间的相对运动，使锂带200从快辊121和压延辊111经过，从而将每个锂带200上的锂转移至快辊121上与锂带200对应的第一区域1211，易于实现，且可靠性高。
在一种实现方式中，涂布装置120还包括覆合辊122，第一极片210用于从快辊121和覆合辊122之间经过，以将快辊121上的第一区域1211的锂，涂布在第一极片210上与第一区域1211对应的第二区域1221。
该实施例中，利用辊系将涂布装置120上的锂转移至第一极片210，涂布装置120还包括与快辊121相对设置的覆合辊122，通过覆合辊122和快辊121之间的相对运动，使第一极片210用于从快辊121和覆合辊122之间经过，以将快辊121上的第一区域1211的锂，涂布在第一极片210上与第一区域1211对应的第二区域1221，易于实现，且可靠性高。
举例来说，图2是图1所示的补锂装置100一种可能的实现方式的结构示意图，如图2所示，压延装置110包括压延辊111，涂布装置120包括快辊121和覆合辊 122。多个压延辊111环绕快辊121设置，且在第一方向X上错开设置，即各个压延辊111的辊面在第一方向X上不重叠。锂带200从快辊121和压延辊111之间经过时，锂带200上的锂会转移至快辊121上与锂带200对应的第一区域1211。接着，第一极片210从快辊121和覆合辊122之间经过时，快辊121上的第一区域1211的锂，转移至第一极片210上与第一区域1211对应的第二区域1221。
通常，压延辊111的尺寸小于快辊121的尺寸，例如图2所示，压延辊111的直径小于快辊121的直径，并且，沿第一方向X压延辊11的尺寸也小于快辊121的尺寸。这样，当压延辊111和快辊121之间相对运动时，压延辊111朝向快辊121的一侧会承受较大的压力，容易对压延辊111造成损耗，影响其使用寿命。
为此，在一种实现方式中，如图2所示，压延装置110还可以包括背辊112，压延辊111位于背辊112和快辊121之间，背辊112用于向压延辊111提供朝向快辊121的支撑力。通过增加背辊112，向压延辊111提供朝向快辊121的支撑力，可以平衡快辊121向压延辊111施加的压力，从而对压延辊111形成保护。
图2中示出了多个压延装置110，为了更清楚地说明如何通过多个压延装置110同时将多个锂带200上的锂分别转移至第一极片210上的多个第二区域1221，以下，结合图3至图7进行详细说明。其中，图3示出了仅有一个压延装置110的情况，能够实现“一出一”，即将一个第一极片210送入补锂装置100后仅送出一个第二极片220；图4示出了设置两个压延装置110的情况，能够实现“一出二”，即将一个第一极片210送入补锂装置100后送出两个第二极片220；图5和图6示出了设置三个压延装置110的情况，能够实现“一出三”，即将一个第一极片210送入补锂装置100后送出三个第二极片220；图7示出了设置四个压延装置110的情况，能够实现“一出四”，即将一个第一极片210送入补锂装置100后送出四个第二极片220。
如图3所示，图3为图2所示的补锂装置100中的压延装置110和涂布装置120的相对位置的示意图，其中，图3中的(a)为压延装置11和涂布装置120的侧视图，(b)为其俯视图，(c)为第一极片210朝向压延装置110一侧的表面的示意图。压延装置110包括压延辊111和背辊112，涂布装置120包括快辊121和覆合辊122。从图3中可以看出，快辊121和压延辊111沿Y方向相对设置，Y方向与第一方向X垂直，第一方向X即第一极片210的幅宽方向。当锂带200从快辊121和压延辊111之间经过时，锂带200上的锂转移至快辊121的第一区域1211上。接着，当第一极片210从快 辊121和覆合辊122之间经过时，快辊121上的第一区域1211的锂转移至第一极片210上与第一区域1211对应的第二区域1221。
图4与图3相比，增加至两个压延装置110。其中，图4中的(a)为压延装置110和涂布装置120的侧视图，(b)为其俯视图，(c)为第一极片210朝向压延装置110一侧的表面的示意图。从图4中可以看出，快辊121沿Y方向的两侧分别设置有两个压延辊111，两个压延辊111在第一方向X上错开设置。一个锂带200从快辊121与一个压延辊111之间经过，另一个锂带200从快辊121与另一个压延辊111之间经过，这样，就可以将两个锂带200上的锂，同时转移至快辊121沿第一方向X排列的两个第一区域1211，包括第一区域1211A和第一区域1211B，图4中将第一区域1211A和第一区域1211B用不同的线条图案来填充以作区分。接着，当第一极片210由左向右从快辊121和覆合辊122之间经过时，快辊121的第一区域1211A上的锂转移至第一极片210上与第一区域1211A对应的第二区域1221A，快辊121的第一区域1211B上的锂转移至第一极片210上与第一区域1211B对应的第二区域1221B。
图5与图4相比，增加至三个压延装置110。其中，图5中的(a)为压延装置110和涂布装置120的侧视图，(b)为其俯视图，(c)为第一极片210朝向压延装置110一侧的表面的示意图。从图5中可以看出，快辊121沿Y方向的两侧分别设置有两个压延辊111，且快辊121沿第一方向X的一侧还设置有另一压延辊111。三个压延辊111在第一方向X上错开设置。锂带200从快辊121与每个压延辊111之间经过，以使锂带200上的锂，同时转移至快辊121沿第一方向X排列的三个第一区域1211，包括第一区域1211A、第一区域1211B和第一区域1211C，图5中将第一区域1211A、第一区域1211B和第一区域1211C用不同的线条图案来填充以作区分。接着，当第一极片210由左向右从快辊121和覆合辊122之间经过时，快辊121上的第一区域1211A上的锂转移至第一极片210上与第一区域1211A对应的第二区域1221A，快辊121上的第一区域1211B上的锂转移至第一极片210上与第一区域1211B对应的第二区域1221B，快辊121上的第一区域1211C上的锂转移至第一极片210上与第一区域1211C对应的第二区域1221C。
图6与图4相比，增加至三个压延装置110。图6和图5的区别在于三个压延辊111的相对位置不同。其中，图6中的(a)为压延装置110和涂布装置120的侧视图，(b)为其俯视图，(c)为第一极片210朝向压延装置110一侧的表面的示意图。 从图6中可以看出，快辊121沿Y方向的两侧，其中一侧设置有一个压延辊111，另外一侧设置有两个压延辊111。三个压延辊111在第一方向X上交错设置。锂带200从快辊121与每个压延辊111之间经过，以使锂带200上的锂，同时转移至快辊121沿第一方向X排列的三个第一区域1211，包括第一区域1211A、第一区域1211B和第一区域1211C，图5中将第一区域1211A、第一区域1211B和第一区域1211C用不同的线条图案来填充以作区分。接着，当第一极片210由左向右从快辊121和覆合辊122之间经过时，快辊121的第一区域1211A上的锂转移至第一极片210上与第一区域1211A对应的第二区域1221A，快辊121的第一区域1211B上的锂转移至第一极片210上与第一区域1211B对应的第二区域1221B，快辊121的第一区域1211C上的锂转移至第一极片210上与第一区域1211C对应的第二区域1221C。
图7与图5和图6相比，增加至四个压延装置110。其中，图7中的(a)为压延装置110和涂布装置120的侧视图，(b)为其俯视图，(c)为第一极片210朝向压延装置110一侧的表面的示意图。从图7中可以看出，在快辊121沿Y方向的两侧，其中一侧设置有两个压延辊111，另外一侧设置有两个压延辊111。四个压延辊111在第一方向X上交错设置。锂带200从快辊121与每个压延辊111之间经过，以使锂带200上的锂，同时转移至快辊121沿第一方向X排列的三个第一区域1211，包括第一区域1211A、第一区域1211B和第一区域1211C上，图5中将第一区域1211A、第一区域1211B、第一区域1211C和第一区域1211D用不同的线条图案来填充以作区分。接着，当第一极片210由左向右从快辊121和覆合辊122之间经过时，快辊121的第一区域1211A上的锂转移至第一极片210上与第一区域1211A对应的第二区域1221A，快辊121的第一区域1211B上的锂转移至第一极片210上与第一区域1211B对应的第二区域1221B，快辊121的第一区域1211C上的锂转移至第一极片210上与第一区域1211C对应的第二区域1221C，快辊121的第一区域1211D上的锂转移至第一极片210上与第一区域1211D对应的第二区域1221D。
应理解，图3至图7仅为示例，多个压延辊111与快辊121之间的相对位置还可以具有其他实现方式。压延辊111的数量也可以更多。
在一种实现方式中，如图2至图7所示，锂带200与压延辊111之间设置有保护带210，保护带210与锂带200同时从快辊121和压延辊111之间经过，保护带210用于隔离锂带200与压延辊111。该保护带210可以对锂带200形成保护，避免锂带200 从快辊121和压延辊111之间经过时受到损伤。保护带210的材料例如为聚对苯二甲酸乙二醇酯(polyethylene terephthalate，PET)等材料，易于获取，且成本低。
在一种实现方式中，如图2至图7所示，压延装置110还包括刮刀140，刮刀140用于控制快辊111上的第一区域1211的锂在第一方向X上的宽度。通过刮刀140，可以精准地在控制快辊11上第一区域1211的锂的宽度，以匹配对应的第二极片220的幅宽。
例如，如图2至图7所示，第一区域1211A、第一区域1211B、第一区域1211C和第一区域1211D的锂在第一方向X上的宽度，可以由刮刀140来控制。以第一区域1211A为例，假设所需求的第一区域1211A的锂的宽度为W，与其对应的刮刀140可以在快辊121的转动过程中，刮掉宽度W之外的锂，保留宽度为W的锂，使得转移至第一极片210上与第一区域1211A对应的第二区域1221A上的锂的宽度为W，从而匹配与第二区域1221A对应的第二极片220的幅宽。
在一种实现方式中，多个第二区域1221中的至少部分第二区域1221在第一方向X上的宽度不同。也就是说，多个第二区域1221的在第一方向X上的宽度可以相同，也可以部分或者全部不同。
例如，如图2至图7所示，第一区域1211A、第一区域1211B、第一区域1211C和第一区域1211D在第一方向X上的宽度可以相同，也可以不同。这样，在第一极片210上的第二区域1221A、第二区域1221B、第二区域1221C和第二区域1221D的宽度也不同，通过分切装置130进行分切后，便可以形成幅宽不同的多个第二极片220。
由于本申请实施例的补锂装置100可以同时形成幅宽不同的补锂后的多个第二极片220，适用性更强。
在一种实现方式中，补锂装置100包括第一子装置101和第二子装置102，第一子装置101和第二子装置02中的每个包括前述的多个压延装置110和涂布装置120，第一子装置101用于在第一极片210的第一表面210A上的多个第二区域1221涂布锂，第二子装置用于在第一极片210的第二表面210B上的多个第二区域1221涂布锂。
例如，如图8所示，补锂装置100包括两套子装置，即第一子装置101和第二套子装置102，第一子装置101用于对第一极片210的第一表面210A进行补锂，第二子装置102用于对第一极片210的第二表面210B进行补锂。第二套子装置102对第一极片210的第二表面210B进行补锂的过程，与前述的第一子装置101对第一极片210 的第一表面210A进行补锂的过程相似，为了简洁，这里不再赘述。通过设置两套子装置，先后对第一极片210的两个表面进行补锂，增强了对第二极片220的补锂效果。如图8所示，当第一极片210的两个表面均补锂完成后，再通过分切装置130分切形成多个第二极片220。
由于是在大幅宽的第一极片210的多个第二区域1221上同时形成锂，因此后续需要通过分切装置130，基于多个第二区域1221对第一极片210进行分切，以形成分切后的多个第二极片220。
分切装置130例如包括机械切刀或者激光切刀等，通过机械切刀或者激光切刀对第一极片210进行分切，易于操作，且可靠性高。图8中是以圆切刀为例，通过圆切刀，基于多个第二区域1221对第一极片210进行分切，从而形成与多个第二区域对应的多个第二极片220。
还可以对分切后的每个第二极片220进行其他处理，以形成极耳等部分，该极耳形成于第二极片220上未涂布锂的区域。之后通过例如卷绕或者叠片等方式，形成电极组件。
在一种实现方式中，如图8所示，补锂装置100还包括放卷装置150，用于释放第一极片210。如图8所示，放卷装置150例如可以是放卷辊150。
在一种实现方式中，如图8所示，补锂装置100还包括多个收卷装置160，分别用于对多个补锂后的第二极片220进行收卷。如图8所示，收卷装置160例如可以是收卷辊160。
通过放卷装置150和多个收卷装置160，分别完成对第一极片210的放卷和对多个第二极片220的收卷，操作简便，且可靠性高。
可见，本申请实施例中，通过合理地设置多个压延辊111和快辊121之间的相对位置，以同时形成补锂后的多个第二极片220，极大地提高了补锂效率，且对大幅宽的第一极片210的补锂和分切一体集成，进一步提高了产能，降低了成本投入。
图9示出了本申请实施例的补锂方法300。该补锂方法300可以由上述的补锂装置100执行，如图9所示，方法100包括以下步骤中的部分或全部。
在步骤310中，通过多个压延装置110，将多个锂带200上的锂，分别转移至涂布装置120上沿第一方向X分布的多个第一区域1211，第一方向X为待补锂的第一极片210的幅宽方向。
在步骤320中，通过涂布装置120，将多个第一区域1211的锂，分别涂布在第一极片210上与多个第一区域1211对应的多个第二区域1221。
在步骤330中，通过分切装置130，根据多个第二区域1221，对第一极片210进行分切，以形成多个分切后的第二极片220。
在一种实现方式中，压延装置110包括压延辊111，涂布装置120包括快辊121，将多个锂带200上的锂，分别转移至涂布装置120上沿第一方向X分布的多个第一区域1211，包括：将锂带200从快辊和压延辊111之间经过，以使锂带200上的锂转移至快辊121上与锂带200对应的第一区域1211。
在一种实现方式中，锂带200与压延辊111之间设置有保护带210，将锂带200从快辊121和压延辊111之间经过，包括：将保护带210与锂带200同时从快辊121和压延辊111之间经过，保护带210用于隔离锂带200与压延辊111。
在一种实现方式中，保护带210的材料为PET。
在一种实现方式中，压延装置110还包括刮刀140，方法还包括：通过刮刀140，控制快辊上的第一区域1211在第一方向X上的宽度。
在一种实现方式中，涂布装置120还包括覆合辊122，将多个第一区域1211的锂，分别涂布在第一极片210上与多个第一区域1211对应的多个第二区域1221，包括：将第一极片210从快辊和覆合辊122之间经过，以将快辊121上的第一区域1211的锂，涂布在第一极片210上与第一区域1211对应的第二区域1221。
在一种实现方式中，多个第二区域1221中的至少部分第二区域1221在第一方向X上的宽度不同。
在一种实现方式中，方法300还包括：通过多个收卷装置160，分别对多个补锂后的第二极片220进行收卷。
应理解，方法实施例中的补锂方法300中的具体实施方式以及实现的有益效果，可以参考装置实施例中针对补锂装置100的描述，为了简洁，此处不再赘述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考上述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。

Claims (19)

  1. 一种补锂装置，其特征在于，包括：
    多个压延装置，用于将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，所述第一方向为待补锂的第一极片的幅宽方向；
    所述涂布装置，用于将所述多个第一区域的锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域；以及，
    分切装置，用于根据所述多个第二区域，对所述第一极片进行分切，以形成多个分切后的第二极片。
  2. 根据权利要求1所述的补锂装置，其特征在于，所述压延装置包括压延辊，所述涂布装置包括快辊，所述锂带用于从所述快辊和所述压延辊之间经过，以使所述锂带上的锂转移至所述快辊上与所述锂带对应的所述第一区域。
  3. 根据权利要求2所述的补锂装置，其特征在于，所述锂带与所述压延辊之间设置有保护带，所述保护带与所述锂带同时从所述快辊和所述压延辊之间经过，所述保护带用于隔离所述锂带与所述压延辊。
  4. 根据权利要求3所述的补锂装置，其特征在于，所述保护带的材料为聚对苯二甲酸乙二醇酯PET。
  5. 根据权利要求2至4中任一项所述的补锂装置，其特征在于，所述压延装置还包括背辊，所述压延辊位于所述背辊和所述快辊之间，所述背辊用于向所述压延辊提供朝向所述快辊的支撑力。
  6. 根据权利要求2至5中任一项所述的补锂装置，其特征在于，所述压延装置还包括刮刀，所述刮刀用于控制所述快辊上的所述第一区域的锂在所述第一方向上的宽度。
  7. 根据权利要求2至6中任一项所述的补锂装置，其特征在于，所述涂布装置还包括覆合辊，所述第一极片用于从所述快辊和所述覆合辊之间经过，以将所述快辊上的所述第一区域的锂，涂布在所述第一极片上与所述第一区域对应的所述第二区域。
  8. 根据权利要求1至7中任一项所述的补锂装置，其特征在于，所述多个第二区域中的至少部分第二区域在所述第一方向上的宽度不同。
  9. 根据权利要求1至8中任一项所述的补锂装置，其特征在于，所述补锂装置包 括第一子装置和第二子装置，所述第一子装置和所述第二子装置中的每个包括所述多个压延装置和所述涂布装置，所述第一子装置用于在所述第一极片的第一表面上的所述多个第二区域涂布锂，所述第二子装置用于在所述第一极片的第二表面上的所述多个第二区域涂布锂。
  10. 根据权利要求1至9中任一项所述的补锂装置，其特征在于，所述分切装置包括机械切刀或者激光切刀。
  11. 根据权利要求1至10中任一项所述的补锂装置，其特征在于，所述补锂装置还包括多个收卷装置，分别用于对多个补锂后的所述第二极片进行收卷。
  12. 一种补锂方法，其特征在于，包括：
    通过多个压延装置，将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，所述第一方向为待补锂的第一极片的幅宽方向；
    通过所述涂布装置，将所述多个第一区域的所述锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域；
    通过分切装置，根据所述多个第二区域，对所述第一极片进行分切，以形成多个分切后的第二极片。
  13. 根据权利要求12所述的补锂方法，其特征在于，所述压延装置包括压延辊，所述涂布装置包括快辊，所述将多个锂带上的锂，分别转移至涂布装置上沿第一方向分布的多个第一区域，包括：
    将所述锂带从所述快辊和所述压延辊之间经过，以使所述锂带上的所述锂转移至所述快辊上与锂带对应的所述第一区域。
  14. 根据权利要求13所述的补锂方法，其特征在于，所述锂带与所述压延辊之间设置有保护带，所述将所述锂带从所述快辊和所述压延辊之间经过，包括：
    将所述保护带与所述锂带同时从所述快辊和所述压延辊之间经过，所述保护带用于隔离所述锂带与所述压延辊。
  15. 根据权利要求14所述的补锂方法，其特征在于，所述保护带的材料为聚对苯二甲酸乙二醇酯PET。
  16. 根据权利要求13至15中任一项所述的补锂方法，其特征在于，所述压延装置还包括刮刀，所述方法还包括：
    通过所述刮刀，控制所述快辊上的所述第一区域的锂在所述第一方向上的宽度。
  17. 根据权利要求13至16中任一项所述的补锂方法，其特征在于，所述涂布装置还包括覆合辊，所述将所述多个第一区域的锂，分别涂布在所述第一极片上与所述多个第一区域对应的多个第二区域，包括：
    将所述第一极片从所述快辊和所述覆合辊之间经过，以将所述快辊上的所述第一区域的锂，涂布在所述第一极片上与所述第一区域对应的所述第二区域。
  18. 根据权利要求12至17中任一项所述的补锂方法，其特征在于，所述多个第二区域中的至少部分第二区域在所述第一方向上的宽度不同。
  19. 根据权利要求12至18中任一项所述的补锂方法，其特征在于，所述方法还包括：
    通过多个收卷装置，分别对多个补锂后的所述第二极片进行收卷。
PCT/CN2022/106832 2022-07-20 2022-07-20 补锂装置和补锂方法 WO2024016226A1 (zh)

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