WO2023005479A1 - 补锂装置及补锂方法 - Google Patents

补锂装置及补锂方法 Download PDF

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Publication number
WO2023005479A1
WO2023005479A1 PCT/CN2022/098996 CN2022098996W WO2023005479A1 WO 2023005479 A1 WO2023005479 A1 WO 2023005479A1 CN 2022098996 W CN2022098996 W CN 2022098996W WO 2023005479 A1 WO2023005479 A1 WO 2023005479A1
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WO
WIPO (PCT)
Prior art keywords
roller
lithium
coating
release agent
groove
Prior art date
Application number
PCT/CN2022/098996
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English (en)
French (fr)
Inventor
费新路
谢斌
赵丰刚
陈仕通
徐永强
冯涛
李克强
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to MX2023006313A priority Critical patent/MX2023006313A/es
Priority to EP22848086.9A priority patent/EP4239704A4/en
Publication of WO2023005479A1 publication Critical patent/WO2023005479A1/zh
Priority to US18/220,301 priority patent/US20230352648A1/en

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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
    • 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
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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

Definitions

  • the present application relates to the technical field of battery production equipment, in particular to a lithium replenishing device and a lithium replenishing method.
  • lithium-ion batteries are widely used in electric vehicles, consumer electronics and other fields due to their high energy density and long service life.
  • SEI film ie, solid electrolyte film
  • the lithium supplementation process is very important.
  • the purpose of the present application is to provide a lithium supplementation device and a lithium supplementation method.
  • the lithium replenishment device can avoid the sticking of the lithium belt to the roll and improve production safety.
  • the present application provides a lithium replenishment device for laminating a lithium strip to a substrate, including: a laminating mechanism, including a first roller, a second roller, and a third roller disposed adjacently in sequence , the first roller and the second roller are used to calender the lithium ribbon, and after calendering, the lithium ribbon is attached to the second roller, the second roller and the third roller
  • the wheel is used to cover the lithium strip attached to the second roller on the substrate;
  • the lithium strip includes two first surfaces opposite along the width direction of the lithium strip, and facing the The second surface of the second roller; a coating mechanism, along the direction of travel of the lithium belt, the coating mechanism is located upstream of the lamination mechanism, and the coating mechanism is configured to simultaneously said second surface and applying a release agent to at least one of said first surfaces.
  • the release agent is applied to the second surface and the first surface of the lithium strip simultaneously by the coating mechanism, and the release agent on the second surface and the first surface follows the extension of the lithium strip. Diffusion, so that the extended part of the lithium ribbon has a release agent, when the lithium ribbon follows the second roller and rotates between the third roller and the second roller, the lithium ribbon can be separated from the second roller and bonded to the base material, avoiding the sticking of the lithium belt to the roller, and improving production safety.
  • the coating mechanism includes a coating roller, the roller surface of the coating roller is provided with a groove for accommodating the lithium ribbon, and the groove is configured to simultaneously a second surface and applying a release agent to at least one of said first surfaces.
  • the groove can accommodate the lithium ribbon, the groove is matched with the lithium ribbon so that the groove can apply the release agent to the second surface and the first surface at the same time.
  • the groove is an annular groove arranged around the axis of the coating roller.
  • the annular groove continuously coats the release agent on the second surface and the first surface of the lithium ribbon, thereby improving the coating efficiency.
  • the groove includes a bottom surface and two opposite first sides along the axial direction of the coating roller, the bottom surface is configured to apply a release agent to the second surface, Both of the first sides are configured to apply a release agent to both of the first surfaces.
  • the release agent is applied to the second surface and the two first surfaces of the lithium ribbon simultaneously through the bottom surface and the two first sides, so that the coating effect can be ensured and the coating efficiency is high.
  • the inclined setting of the first side and the bottom surface enables the first surface of the lithium ribbon to be coated with more release agent, so as to ensure that the lithium ribbon has sufficient mold release in the extended part of the lithium ribbon after being rolled. agent.
  • the coating mechanism further includes a fixed roller, at least a part of the fixed roller is embedded in the groove and has a gap with the groove, and the fixed roller is used to control the adhesion on the The thickness of the release agent on the applicator roll.
  • the fixed roller can level off the over-thick part of the release agent on the coating roller, thereby controlling the thickness of the release agent on the coating roller and ensuring the surface adhesion of the lithium strip.
  • the thickness of the release agent is consistent.
  • a boss is provided on the roller surface of the fixed roller, and the boss is embedded in the groove and has a gap with the groove.
  • the thickness of the release agent attached to the coating roller is controlled through the gap between the boss and the groove, and the structure is simple.
  • the boss is an annular boss arranged around the axis of the fixed roller.
  • the boss is arranged around the axis of the fixed roller, which is convenient for processing.
  • the boss is formed with a notch for controlling the thickness of the release agent on the coating roller.
  • the fixed roller scraper is easily formed at the notch, so as to control the thickness of the release agent on the coating roller.
  • the fixed roller is located on a side of the coating roller away from the lithium belt.
  • the fixed roller is located on the side of the coating roller away from the lithium ribbon, so that the installation space can be reasonably utilized to avoid affecting the running of the lithium ribbon.
  • the coating mechanism further includes: a release agent extruding mechanism, configured to extrude the release agent between the coating roller and the fixed roller.
  • the release agent is extruded between the coating roller and the fixed roller through the release agent extrusion mechanism, so as to provide the release agent for the coating roller.
  • the coating mechanism further includes: a support roller, and the lithium belt passes between the support roller and the coating roller.
  • the supporting roller can support the lithium ribbon, so that the lithium ribbon can cooperate with the coating roller, and ensure that the surface of the lithium ribbon is uniformly attached with the release agent.
  • the embodiment of the present application also provides a method for replenishing lithium, which is used for laminating a lithium strip to a substrate, comprising: sending the lithium strip between the first roller and the second roller, passing The first roller and the second roller calender the lithium ribbon, and after calendering, the lithium ribbon is attached to the second roller, and the lithium ribbon includes two opposing rollers along the width direction of the lithium ribbon.
  • the substrate is fed between the second roller and the third roller, passing through the second roller and the first roller
  • Three rollers cover the lithium strip attached to the second roller on the base material; along the direction of travel of the lithium strip, upstream of the first roller and the second roller , applying a release agent to the second surface and to at least one of the first surfaces simultaneously by a coating mechanism.
  • the release agent coating on the first surface of the lithium strip can be realized, the situation that the lithium strip sticks to the roller during the lithium supplementation process can be avoided, and the production safety of lithium supplementation can be improved.
  • Fig. 1 is a schematic structural diagram of a lithium supplementation device provided by an embodiment of the present application
  • Figure 2 is a schematic diagram of the principle of a lithium supplementation process provided by an embodiment of the present application.
  • Fig. 3 shows the structural representation of the coating roller of an embodiment of the present application
  • Fig. 4 shows the structural representation of the coating mechanism of an embodiment of the present application
  • Fig. 5 is a schematic diagram of the working state of the coating mechanism of an embodiment of the present application.
  • FIG. 6 is a schematic structural view of a coating mechanism according to another embodiment of the present application.
  • FIG. 7 is a schematic structural view of a coating mechanism according to another embodiment of the present application.
  • FIG. 8 is a schematic diagram of a lithium supplementation device in an embodiment of the present application during the lithium supplementation process
  • Fig. 9 is a schematic diagram of a cleaning mechanism according to an embodiment of the present application.
  • Fig. 10 is another schematic diagram of a cleaning mechanism according to an embodiment of the present application.
  • Figure 11 is a schematic flow chart of a lithium supplementation method according to an embodiment of the present application.
  • Marking description 100-laminating mechanism; 110-first roller; 120-second roller; 130-third roller; 140-fourth roller; 200-coating mechanism; 210-coating roller; 211 -groove; 2111-first side; 2112-bottom surface; ⁇ -angle; 220-fixed roller; 221-boss; 222-gap; Accommodating tank; 300-lithium belt conveying mechanism; 310-lithium belt unwinding roller; 400-substrate conveying mechanism; 410-substrate unwinding roller; 420-substrate rewinding roller; Pressure roller; 610-traction roller; 620-traction belt; 700-cleaning mechanism; 710-cleaning scraper; 720-cleaning brush; 730-vacuum assembly; L-lithium belt; surface; L3-third surface; P-substrate.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • Multiple appearing in this application refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two groups), and “multi-piece” refers to more than two (Includes two pieces).
  • a battery refers to a single physical module comprising 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, and the like.
  • the core component of the lithium-ion battery that can realize the repeated charge and discharge function is the electrode assembly in the battery cell.
  • the electrode assembly includes the positive pole piece, the negative pole piece and the separator.
  • Lithium-ion batteries work primarily by moving lithium ions between the positive and negative plates.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector.
  • the current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer coated.
  • the current collector of the positive active material layer serves as the positive tab.
  • the positive electrode current collector can be aluminum foil, and the positive electrode active material layer can be ternary lithium, lithium manganese oxide, lithium cobalt oxide, or lithium iron phosphate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector.
  • the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer.
  • the current collector of the material layer is used as the negative electrode tab.
  • the negative electrode current collector can be copper foil, and the negative electrode active material layer can be carbon or silicon.
  • Lithium-ion batteries will form a solid electrolyte film during the first charge and discharge process, and the solid electrolyte film will consume part of the lithium, resulting in the loss of lithium, which in turn leads to the loss of lithium-ion battery capacity.
  • active lithium needs to be supplemented on the active material layer of the pole piece in advance during the forming process of the pole piece.
  • the lithium-ion battery is usually coated with lithium on the surface of the pole piece by a lithium-supplementing device to reduce the irreversible decrease in the capacity of the lithium-ion battery during the first charging process, thereby improving the capacity and cycle life of the lithium-ion battery.
  • the pole piece lithium replenishment device can be used to supplement lithium on the pole piece to improve the capacity and cycle life of lithium-ion batteries.
  • the base material mentioned in the embodiment of the present application may be a metal foil, that is, a current collector, or a pole piece provided with an active material layer.
  • the lithium supplementation process of the substrate mainly includes the calendering process and the cladding process.
  • the calendering process is to thin the lithium strip to form a lithium film; and the lamination process is to laminate the lithium film to the surface of the substrate by rolling. It should be pointed out that, for the convenience of subsequent writing, the lithium membrane in the actual sense is also named after the lithium ribbon.
  • the lithium replenishment device rolls the lithium strip through a lamination mechanism and laminates the rolled lithium strip to the substrate.
  • safety hazards such as smoke and fire often occur.
  • the present application provides a lithium replenishment device, which includes a cladding mechanism and a coating mechanism
  • the cladding mechanism includes a first roller, a second roller and a third roller arranged adjacently in sequence, and the coating
  • the cloth mechanism is arranged upstream of the cladding mechanism, and the second surface of the lithium belt facing the second roller and at least one first surface in the width direction of the lithium belt are coated with a release agent by the coating mechanism, and the second The release agent on the surface and the first surface follows the extension of the lithium belt and diffuses, so that the extended part of the lithium belt has a release agent.
  • FIG. 1 shows a schematic structural diagram of a lithium supplementation device according to an embodiment of the present application
  • FIG. 2 shows a schematic diagram of the principle of a lithium supplementation process according to an embodiment of the present application.
  • the lithium supplementation device includes a cladding mechanism 100 and a coating mechanism 200 .
  • the cladding mechanism 100 includes a first roller 110, a second roller 120 and a third roller 130 arranged adjacently in sequence. As shown in FIG. 2, the first roller 110 and the second roller 120 are used to roll the lithium strip L, and after calendering, the lithium strip L is attached to the second roller 120 to realize the calendering process; the second roller 120 and the third roller 130 are used to cover the lithium strip L attached to the second roller 120 on the base Material P to realize the cladding process.
  • the first roller 110 , the second roller 120 and the third roller 130 are arranged parallel to each other, that is, the axes of the three are parallel.
  • the first roller 110 and the second roller 120 are arranged oppositely, and the nip between the first roller 110 and the second roller 120 is used for passing through the lithium strip L, and the first roller 110 and the second roller 120 Cooperate to realize the calendering function.
  • the second roller 120 and the third roller 130 are arranged oppositely, and the nip between the second roller 120 and the third roller 130 is used for the substrate P to pass through.
  • the second roller 120 and the third roller 130 Cooperate to realize the composite function.
  • first roller 110, the second roller 120 and the third roller 130 is not limited, for example, the first roller 110, the second roller 120 and the third roller 130 can Or, the first roller 110, the second roller 120 and the third roller 130 can also be arranged in sequence along the vertical direction, or, the first roller 110, the second roller 120 and the third roller
  • the wheels 130 can also be arranged in an L shape.
  • the arrangement of the first roller 110, the second roller 120, and the third roller 130 depends on the working condition requirements of the lithium supplementing device.
  • first roller 110 the second roller
  • the arrangement form of the rollers 120 and the third rollers 130 is illustrated in this embodiment by taking the arrangement of the first rollers 110 , the second rollers 120 and the third rollers 130 in sequence along the horizontal direction as an example.
  • the lithium ribbon L includes two first surfaces L1 (please refer to FIG. 2 ) opposite along the width direction of the lithium ribbon L, and a second surface L2 facing the second roller 120.
  • the width direction of the lithium ribbon L is the same as the second surface L1.
  • the axes of the rollers 120 are parallel, that is, the first surface L1 is the narrow side of the lithium ribbon L.
  • the lithium strip L has certain plasticity, when it is sent between the first roller 110 and the second roller 120, because the gap between the first roller 110 and the second roller 120 is smaller than that of the lithium strip L Thickness, the lithium strip L will expand in the width direction due to being squeezed, and form a film-like structure with a certain thickness, so that it can be laminated on the surface of the substrate P in the subsequent lamination process.
  • the coating mechanism 200 is arranged upstream of the laminating mechanism 100, and the coating mechanism 200 is configured to simultaneously coat the second surface L2 and at least one first surface L1. Cloth release agent.
  • upstream and downstream refer to the sequence in the processing technology of the lithium strip L, and have nothing to do with the spatial position.
  • the coating mechanism 200 is arranged upstream of the cladding mechanism 100, which means that the lithium strip L is first coated.
  • the mechanism 200 coats the release agent, and then passes through the calendering and laminating process of the laminating mechanism 100 , and finally laminates it on the substrate P.
  • the release agent is applied to the second surface L2 and the first surface L1 through the coating mechanism 200 at the same time, and the second surface L2 and the first surface L1 are released from the mold.
  • the agent diffuses following the extension of the lithium ribbon L, so that the extended part of the lithium ribbon L has a release agent.
  • the lithium ribbon L follows the second roller 120 and rotates between the third roller 130 and the second roller 120, due to The lithium ribbon L is coated with a release agent, so that the lithium ribbon L can be transferred from the second roller 120 to the substrate P, and the lithium ribbon L is not easy to adhere to the second roller 120, which relieves the lithium ribbon L. Roller sticking causes problems such as smoke and fire, which improves production safety.
  • the coating mechanism 200 can only apply the release agent to one first surface L1 of the lithium ribbon L, or can apply the release agent to both first surfaces L1 of the lithium ribbon L at the same time.
  • the coating mechanism 200 only applies the release agent to one first surface L1 of the lithium ribbon L, in order to ensure that the two first surfaces L1 of the lithium ribbon L can be coated with the release agent, the lithium replenishing device is also provided with another The coating mechanism applies the release agent to the two first surfaces L1 of the lithium ribbon L in the width direction through the two coating mechanisms.
  • the coating mechanism 200 of the embodiment of the present application can apply the release agent to the second surface L2 and the two first surfaces L1 of the lithium ribbon L at the same time.
  • FIG. 3 shows a schematic structural view of a coating roller 210 according to an embodiment of the present application
  • FIG. 4 shows a schematic structural view of a coating mechanism 200 according to an embodiment of the present application.
  • the coating mechanism 200 includes a coating roller 210, and the roller surface of the coating roller 210 is provided with a groove 211 for accommodating the lithium strip L, the groove 211 It is configured to apply a release agent to the second surface L2 and to the at least one first surface L1 simultaneously. Since the groove 211 can accommodate the lithium ribbon L, the groove 211 coats the release agent on the lithium ribbon L by: when the lithium ribbon L passes through the groove 211, the mold release agent adhered to the groove surface of the groove 211 It is attached to the first surface L1 and the second surface L2 of the lithium ribbon L at the same time.
  • the groove 211 is an annular groove disposed around the axis of the coating roller 210 .
  • the annular groove 211 continuously coats the release agent on the first surface L1 and the second surface L2 of the lithium ribbon L, so as to improve the coating efficiency.
  • the groove 211 includes a bottom surface 2112 and two opposite first side surfaces 2111 along the axial direction of the coating roller 210, and the bottom surface 2112 is configured to face toward the second surface.
  • L is coated with a release agent, and the two first sides 2111 are configured to apply a release agent to the two first surfaces L1.
  • Both the bottom surface 2112 and the two first side surfaces 2111 are groove surfaces of the groove 211 .
  • the bottom surface 2112 connects the two first side surfaces 2111 so as to accommodate the lithium strip L; when the bottom surface 2112 and the first side surface 2111 are coated with a release agent, after the lithium strip L enters the groove 211, the release agent on the bottom surface 2112 and The release agent on the first side 2111 can be transferred to the second surface L2 and the first surface L1 of the lithium ribbon L at the same time, and the release agent is applied to the second surface L2 and the first surface L1 simultaneously.
  • the release agent is applied to the second surface L2 and the two first surfaces L1 of the lithium ribbon L at the same time through the bottom surface 2112 and the two first side surfaces 2111, so that the coating effect can be guaranteed and the coating efficiency is high.
  • the first side 2111 can also function as a position limiter to ensure that both the first surface L1 and the second surface L2 of the lithium ribbon L can be coated with a release agent.
  • the included angle ⁇ may be a right angle.
  • the included angle ⁇ may also be an obtuse angle. That is, the first side surface 2111 and the bottom surface 2112 are arranged obliquely. In this case, the first side surface 2111 has a larger area, so the first surface L1 can be coated with more release agent to ensure that the lithium strip L is rolled. Finally, there is enough release agent in the extended part of the lithium ribbon L.
  • the included angle ⁇ is 135°, which is convenient for processing.
  • the coating mechanism 200 also includes a fixed roller 220, at least a part of the fixed roller 220 is embedded in the groove 211 and has a gap with the groove 211, and the fixed roller 220 is used to control The thickness of the release agent attached to the coating roller 210.
  • the gap between the part of the fixed roller 220 embedded in the groove 211 and the groove 211 means that the contour of the part of the structure of the fixed roller 220 matches the contour of the groove 221, and this part of the fixed roller 220 is embedded in the groove 211, which is consistent with the groove 211.
  • a gap is formed between groove surfaces of the groove 211 to allow the release agent to pass through.
  • the thickness of the release agent attached to the coating roller 210 can be controlled. That is, the fixed roller 220 is fixedly installed, the coating roller 210 is rotated, and the coating roller 210 can rotate relative to the fixed roller 220 . Through the cooperation of the fixed roller 220 and the groove 211, the thickness of the release agent on the coating roller 210 can be controlled to ensure that the thickness of the release agent attached to the surface of the lithium ribbon L is consistent.
  • the fixed roller 220 will move the release agent on the coating roller 210 over The thick part is scraped off so that the thickness of the release agent on the coating roller 210 is roughly equal to the width of the gap, so that the thickness of the release agent on the coating roller 210 is consistent.
  • the coating roller 210 cooperates with the lithium ribbon L, the release agent on the coating roller 210 is transferred to the first surface L1 of the lithium ribbon L, and the release agent is coated on the first surface L1. Since the thickness of the release agent on the coating roller 210 is uniform, the problem of uneven coating due to the inability of the coating roller 210 to provide the release agent uniformly can be alleviated, so that the thickness of the release agent on the first surface L1 is consistent.
  • a boss 221 is provided on the roller surface of the fixed roller 220 , and the boss 221 is embedded in the groove 211 and has a gap with the groove 211 . That is, the profile of the boss 221 matches the profile of the groove 211, the depth value of the boss 221 embedded in the groove 211 determines the size of the gap between the boss 221 and the groove 211, by adjusting the embedding of the boss 221 into the groove 211 The depth can change the gap between the boss 221 and the groove 211 , and then control the thickness of the release agent on the coating roller 210 . The thickness of the release agent adhering to the coating roller 210 is controlled through the gap between the boss 221 and the groove 211, and the structure is simple and the operation is convenient.
  • the boss 221 is an annular boss arranged around the axis of the fixed roller 220, which is convenient for processing.
  • FIG. 5 shows a schematic view of the working state of the coating mechanism 200 according to an embodiment of the present application.
  • the boss 221 is arranged around the axis of the fixed roller 220, and the boss 221 has a gap 222 in the circumferential direction of the fixed roller 220, in other words, the boss 221 in the annular structure
  • the boss 221 is formed with a notch 222 for controlling the thickness of the release agent on the coating roller 210 .
  • the notch 222 cuts off the annular boss 221, and at the same time, the notch 222 runs through the boss 221 along the axial direction of the fixed roller 220, so that the notch 222 of the boss 221 is close to the concave
  • a fixed roller scraper 223 is formed at the edge of the groove 211, and the fixed roller scraper 223 matches the contour of the groove 211, and the gap between the fixed roller scraper 223 and the groove 211 determines the thickness of the release agent attached to the groove surface of the groove 211 , and then control the thickness of the release agent on the coating roller 210 .
  • the coating roller 210 first passes through the fixed roller 220, cooperates with the fixed roller 220 to control the thickness of the release agent on the coating roller 210, and then the coating roller 210 Then apply the release agent on the second surface L2 and the first surface L1 of the lithium ribbon L.
  • the fixed roller 220 is located on a side of the coating roller 210 away from the lithium strip L. As shown in FIG. That is, the fixed roll 220 and the lithium ribbon L are arranged at 180° on the turning direction of the coating roll 210 . This setting method makes reasonable use of the installation space and avoids affecting the movement of the lithium belt L.
  • the setting position of the fixed roller 220 can be determined according to the actual working conditions of lithium supplementation, and the fixed roller 220 can be arranged on the coating roller under the condition that it does not affect the running of the lithium strip L and does not interfere with other components. Any position of the turning of 210, as long as the thickness of the release agent on the coating roller 210 can be guaranteed to be consistent.
  • the coating mechanism 200 may also include a release agent extrusion mechanism (not shown in the figure), and the release agent extrusion mechanism is used to extrude the release agent to the coating roller 210 and the fixed roller 210. Between the rollers 220.
  • the storage device is connected through a conduit, and the release agent is extruded to between the coating roller 210 and the fixed roller 220 through the conduit through a pumping mechanism.
  • the coating mechanism 200 further includes a supporting roller 230 , and the lithium belt L passes between the supporting roller 230 and the coating roller 210 . That is, the supporting roller 230 is in contact with the third surface L3 of the lithium ribbon L facing away from the second roller 120 (shown in FIG. 1 ), and supports the third surface L3 (see FIG. 4 ). During the process of running the lithium strip L, the lithium strip L will shake.
  • the lithium strip L is limited between the support roller 230 and the coating roller 210 to ensure that the lithium strip L
  • the first surface L1 and the second surface L2 of the ribbon L can be coated with a release agent at the same time, so as to ensure that the release agent attached to the surface of the lithium ribbon L is uniform.
  • the support roll 230 is arranged in parallel with the coating roll 210, the size of the groove 211 of the coating roll 210 is slightly larger than the size of the lithium strip L, and the roll surface of the support roll 230 is in contact with the roll surface of the coating roll 210.
  • the support roller 230 presses the lithium strip L into the groove 211 of the coating roller 210, the contact stress between the support roller 230 and the lithium strip L is stable, and the gap between the lithium strip L and the groove 211 is guaranteed to be fixed, thereby ensuring The release agent was evenly coated on the surface of the lithium ribbon L.
  • the axial dimension of the supporting roller 230 is greater than the dimension of the groove 211 of the coating roller 210 in the axial direction of the coating roller 210, and when the supporting roller 230 cooperates with the coating roller 210, On the projection plane of the thickness direction of the belt L, the projection of the groove 211 is located within the projection of the support roller 230 .
  • the support roller 230 presses the lithium ribbon L into the groove 211, the movement of the lithium ribbon L in the width direction can be restricted by the two first side surfaces 2111 of the groove 211, thereby functioning as a position limiter.
  • the supporting roller 230 presses the lithium strip L into the groove 211, and following the rotation of the coating roller 210, the groove 211 can simultaneously move toward the second surface L2 and the two sides of the lithium strip L.
  • the first surface L1 is coated with a release agent to ensure that the release agent attached to the surface of the lithium ribbon L is uniform and the coating effect is ensured.
  • FIG. 6 shows a schematic structural diagram of a coating mechanism 200 according to another embodiment of the present application
  • FIG. 7 shows a schematic structural diagram of a coating mechanism 200 according to another embodiment of the present application.
  • the coating mechanism 200 can also be a spraying mechanism, that is, as shown in Figure 6 and Figure 6
  • the coating mechanism 200 includes a nozzle 250 configured to apply a release agent to the second surface L2 and the first surface L1 of the lithium ribbon L at the same time.
  • the coating mechanism 200 is provided with an accommodating groove 260 for accommodating the lithium ribbon L, and the accommodating groove 260 can at least accommodate the second surface L2 and two first surfaces L1 of the lithium ribbon L.
  • the accommodating groove 260 can accommodate the second surface L2 and the two first surfaces L1 of the lithium ribbon L; All surfaces including the surface L2 and the two first surfaces L1 , that is, the receiving groove 260 is an annular groove, and the lithium strip L passes through the receiving groove 260 .
  • FIG. 6 and FIG. 7 are only schematic diagrams of the arrangement of the nozzle 250 of the coating mechanism 200 , and other components are not disclosed.
  • FIG. 8 shows a schematic diagram of a lithium supplementation device in an embodiment of the present application during a lithium supplementation process.
  • the lithium replenishing device also includes a lithium belt conveying mechanism 300 and a substrate conveying mechanism 400, and the lithium belt conveying mechanism 300 is used to send the lithium ribbon L into the first roller 110 and the second roller 120 , the substrate conveying mechanism 400 is used to send the substrate P into between the second roller 120 and the third roller 130 .
  • the lithium ribbon conveying mechanism 300 includes a lithium ribbon unwinding roller 310, the lithium ribbon unwinding roller 310 is configured to set the lithium ribbon L, for example, the lithium ribbon L can be set on the lithium ribbon unwinding roller 310 by winding, and the lithium ribbon The rotation of the unwinding roller 310 sends the lithium ribbon L into between the first roller 110 and the second roller 120 .
  • the substrate conveying mechanism 400 includes a substrate unwinding roller 410 and a substrate winding roller 420 .
  • the substrate unwinding roller 410 and the substrate winding roller 420 are used to set the substrate P, for example, the substrate P can be arranged on the substrate unwinding roller 410 and the substrate winding roller 420 by winding.
  • the substrate P is sent into between the second roller 120 and the third roller 130 by the substrate transport mechanism 400, at this time, The lithium ribbon L and the substrate P are located in the nip between the second roller 120 and the third roller 130 at the same time.
  • the substrate P has a greater surface roughness, and the adhesion between the lithium ribbon L and the substrate P is greater than the adhesion between the lithium ribbon L and the second roller 120.
  • the lithium replenishing device also includes a roll gap adjustment mechanism (not shown in the figure), which is used to adjust the roll gap between the first roll 110 and the second roll 120, and use
  • the purpose of adjusting the roll gap between the second roller 120 and the third roller 130 is to adjust the calendering effect and lamination effect of the lamination mechanism 100, thereby adapting to different lithium replenishment requirements.
  • the lithium replenishing device further includes a preloading mechanism 500.
  • the preloading mechanism 500 is arranged upstream of the coating mechanism 200 along the running direction of the lithium strip L.
  • the preloading mechanism 500 is used to pre-roll the lithium ribbon L to improve the thickness consistency of the lithium ribbon L, thereby significantly improving the effect of coating the release agent on the surface of the lithium ribbon L.
  • the thickness consistency of the lithium ribbon L is related to the manufacturing cost, and reducing the requirement for the thickness consistency of the lithium ribbon L can reduce the cost of the incoming lithium ribbon L.
  • the pre-compression mechanism 500 includes two pre-compression rollers 510 , and the lithium strip L first passes between the two pre-compression rollers 510 and then passes through the coating mechanism 200 .
  • the compression amount of the lithium ribbon L is 10%-20%. Since the compression amount of the lithium ribbon L is small, it is not easy to adhere to the pre-compression roller 510 , so the two pre-compression rollers 510 can be arranged upstream of the coating mechanism 200 .
  • the roll diameter of the first roll 110 is smaller than the roll diameter of the second roll 120 , and rolling with different diameters can be realized by matching the roll diameters.
  • the different-diameter rolling increases the contact area between the second roll 120 and the lithium strip L, improves the biting effect of the lithium strip L and the first roll 110 and the lithium strip L and the second roll. 120, the lithium ribbon L is more likely to adhere to the roller surface of the second roller 120.
  • the laminating mechanism 100 further includes a fourth roller 140, the fourth roller 140 is disposed opposite to the first roller 110 and is located on the side of the first roller 110 away from the second roller 120 .
  • the roller diameter of the fourth roller 140 is larger than the roller diameter of the first roller 110 .
  • the fourth roller 140 and the first roller 110 are in contact with each other and rotate relative to each other, which can reduce the deformation of the first roller 110 during long-term use, improve the thickness consistency of the rolled lithium strip L, and prolong the service life of the device.
  • the lithium replenishing device further includes a traction roller 610 and a traction belt 620, the traction belt 620 is connected to the traction roller 610, and the traction roller 610 is arranged along the direction of the lithium strip L. Downstream of the first roller 110.
  • the traction roller 610 is a driving roller.
  • the traction belt 620 can be connected to the lithium ribbon L, and then the lithium ribbon L can be driven by the rotation of the traction roller 610 .
  • the lithium strip L follows the traction belt 620 and enters between the first roller 110 and the second roller 120, since the gap between the first roller 110 and the second roller 120 is smaller than the thickness of the lithium strip L, the Under the action of pressure, the thinned lithium ribbon L is separated from the traction belt 620 , and the lithium ribbon L is bonded to the roller surface of the second roller 120 .
  • the lithium belt L needs to be manually drawn between the first roller 110 and the second roller 120, and the lithium belt is pulled by the first roller 110 and the second roller 120 L walks. This will cause the coating mechanism 200 to fail to coat the release agent on the initial section of the lithium ribbon L, causing the initial section of the lithium ribbon L to adhere to the surface of the first roller 110 or the second roller 120. At this time, the lithium ribbon The initial segment of L cannot be transferred to the surface of the substrate P, resulting in waste of the lithium ribbon L, and at the same time, reducing the flatness of the roll surfaces of the first roller 110 and the second roller 120, affecting the calendering of the subsequent lithium ribbon L.
  • the lithium shavings and release agent will remain on the roller surface of the second roller 120.
  • the lithium replenishing device further includes a cleaning mechanism 700 for cleaning the roller surface of the second roller 120 .
  • FIG. 9 shows a schematic diagram of a cleaning mechanism 700 according to an embodiment of the present application
  • FIG. 10 shows another schematic diagram of the cleaning mechanism 700 according to an embodiment of the present application.
  • the cleaning mechanism 700 includes a cleaning blade 710, a cleaning brush 720 and a dust suction assembly 730, the cleaning blade 710 is used to abut against the roller surface of the second roller 120, and the cleaning brush 720 is used to In contact with the roller surface of the second roller 120, the dust suction assembly 730 is used to suck up the lithium shavings scraped off by the cleaning blade 710 and remove the mold.
  • the cleaning scraper 710 scrapes off the residual lithium shavings and the release agent on the roller surface of the second roller 120; the cleaning brush 720 is positioned at the downstream of the cleaning scraper 710 for further cleaning the first The roller surface of the two rollers 120; the dust suction assembly 730 can be arranged on the side of the cleaning blade 710, so as to suck and remove the lithium shavings and the release agent scraped off by negative pressure.
  • Fig. 11 shows a schematic flow chart of a method for replenishing lithium according to an embodiment of the present application. As shown in Fig. 11, the method for replenishing lithium includes:
  • the lithium ribbon L is fed between the first roller 110 and the second roller 120, and the lithium ribbon L is rolled by the first roller 110 and the second roller 120, and the lithium ribbon L is attached to the second roller after calendering 120.
  • the lithium ribbon L includes two first surfaces L1 facing each other along the width direction of the lithium ribbon L, and a second surface L2 facing the second roller 120;
  • the substrate P is sent between the second roller 120 and the third roller 130, and the lithium ribbon L attached to the second roller 120 is laminated on the second roller 120 and the third roller 130 Substrate P;
  • a release agent is applied to the first surface L1 of the lithium ribbon L in the width direction, so that the extended part of the lithium ribbon L after being rolled has sufficient Mold release agent, avoid lithium belt L sticking to the roll, improve the safety of production.

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Abstract

本申请涉及一种补锂装置及补锂方法，属于电池生产设备技术领域。补锂装置包括：覆合机构，包括依次相邻设置的第一辊轮、第二辊轮和第三辊轮，第一辊轮和第二辊轮用于压延锂带，且压延后锂带附着于第二辊轮，第二辊轮和第三辊轮用于将附着于第二辊轮上的锂带覆合于基材；锂带包括沿锂带的宽度方向相对的两个第一表面、以及面向第二辊轮的第二表面；涂布机构，沿锂带的走带方向，涂布机构设于覆合机构的上游，涂布机构被配置为同时向第二表面和向至少一个第一表面涂布脱模剂。该补锂装置，能够避免锂带粘辊，提高生产安全性。

Description

补锂装置及补锂方法
相关申请的交叉引用
本申请要求享有于2021年07月30日提交的名称为“补锂装置及补锂方法”的中国专利申请202110876169.3的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池生产设备技术领域，特别是涉及一种补锂装置及补锂方法。
背景技术
目前，锂离子电池由于能量密度高、使用寿命长等优点而被广泛应用于电动汽车、消费类电子产品等领域。锂离子电池在首次充电过程中，由于SEI膜(即固体电解质膜)的形成而会消耗部分锂，继而造成正极材料锂的损失、降低电池的容量，最终造成首次效率的降低。为了减少电池在首次充电过程中电池容量的不可逆降低，业内常通过补锂装置在基材表面进行覆锂来实现。因此，补锂工序十分重要。
发明内容
本申请的目的在于提供一种补锂装置及补锂方法。该补锂装置，能够避免锂带粘辊，提高生产安全性。
本申请是通过下述技术方案实现的：
一方面，本申请提供了一种补锂装置，用于将锂带覆合于基材，包括：覆合机构，包括依次相邻设置的第一辊轮、第二辊轮和第三辊轮，所述第一辊轮和所述第二辊轮用于压延所述锂带，且压延后所述锂带附着于所述第二辊轮，所述第二辊轮和所述第三辊轮用于将附着于所述第二辊轮上的所述锂带覆合于所述基材；所述锂带包括沿所述锂带的宽度方向相对的两个第一表面、以及面向所述第二辊轮的第二表面；涂布机构，沿所述锂带的走带方向，所述涂布机构设于所述覆合机构的上游，所述涂布机构被配置为同时向所述第二表面和向至少一个所述第一表面涂布脱模剂。
根据本申请实施例的补锂装置，通过涂布机构同时向锂带的第二表面和向第一表面涂布脱模剂，第二表面和第一表面的脱模剂跟随锂带的延展而扩散，使得锂带的延展部分具有脱模剂，当锂带跟随第二辊轮转动至第三辊轮与第二辊轮之间时，锂带能够从第二辊轮脱离而覆合于基材，避免锂带粘辊，提高生产安全性。
根据本申请的一些实施例，所述涂布机构包括涂布辊，所述涂布辊的辊面上设有用于容纳所述锂带的凹槽，所述凹槽被配置为同时向所述第二表面和向至少一个所述第一表面涂布脱模剂。
在上述实施方式中，由于凹槽能够容纳锂带，通过凹槽与锂带的配合，以便于凹槽同时向第二表面和向第一表面涂布脱模剂。
根据本申请的一些实施例，所述凹槽为绕所述涂布辊的轴线设置的环形凹槽。
在上述实施方式中，涂布辊转动时，环形的凹槽持续向锂带的第二表面和第一表面涂布脱模剂，提高涂布效率。
根据本申请的一些实施例，所述凹槽包括底面和沿所述涂布辊的轴向相对的两个第一侧面，所述底面被配置为向所述第二表面涂布脱模剂，两个所述第一侧面被配置为向两个所述第一表面涂布脱模剂。
在上述实施方式中，通过底面和两个第一侧面同时向锂带的第二表面和两个第一表面涂布脱模剂，能够保证涂布效果，涂布效率高。
根据本申请的一些实施例，所述第一侧面与所述底面之间具有夹角，所述夹角为钝角。
在上述实施方式中，第一侧面和底面的倾斜设置，使得锂带的第一表面能够涂布较多的脱模剂，以保证锂带被压延后在锂带的延展部分具有足够的脱模剂。
根据本申请的一些实施例，所述涂布机构还包括定辊，所述定辊的至少一部分嵌入所述凹槽且与所述凹槽之间具有间隙，所述定辊用于控制附着在所述涂布辊上的脱模剂的厚度。
在上述实施方式中，通过定辊与凹槽配合，定辊能够将涂布辊上脱模剂超厚的部分刮平，从而控制涂布辊上的脱模剂厚度，保证锂带的表面附着的脱模剂的厚度一致。
根据本申请的一些实施例，所述定辊的辊面上设有凸台，所述凸台嵌入所述凹槽且与所述凹槽之间具有间隙。
在上述实施方式中，通过凸台与凹槽之间的间隙控制附着在涂布辊上的脱模剂的厚度，结构简单。
根据本申请的一些实施例，所述凸台为绕所述定辊的轴线设置的环形凸台。
在上述实施方式中，凸台绕定辊的轴线设置，便于加工。
根据本申请的一些实施例，所述凸台形成有缺口，用于控制所述涂布辊上的脱模剂的厚度。
在上述实施方式中，缺口处容易形成定辊刮刀，以便于控制涂布辊上的脱模剂的厚度。
根据本申请的一些实施例，所述定辊位于所述涂布辊的背离所述锂带的一侧。
在上述实施方式中，定辊位于涂布辊的背离锂带的一侧，合理利用安装空间，避免影响锂带的走带。
根据本申请的一些实施例，所述涂布机构还包括：脱模剂挤出机构，用于将脱模剂挤出到所述涂布辊和所述定辊之间。
在上述实施方式中，通过脱模剂挤出机构将脱模剂挤出到涂布辊和定辊之间，以便于为涂布辊提供脱模剂。
根据本申请的一些实施例，所述涂布机构还包括：支撑辊，所述锂带从所述支 撑辊和所述涂布辊之间穿过。
在上述实施方式中，支撑辊能够支撑锂带，以便于锂带与涂布辊配合，保证锂带的表面均匀附着脱模剂。
另一方面，本申请实施例还提供了一种补锂方法，用于将锂带覆合于基材，包括：将所述锂带送入第一辊轮和第二辊轮之间，通过所述第一辊轮和所述第二辊轮压延所述锂带，压延后所述锂带附着于所述第二辊轮，所述锂带包括沿所述锂带的宽度方向相对的两个第一表面、以及面向所述第二辊轮的第二表面；将所述基材送入所述第二辊轮和第三辊轮之间，通过所述第二辊轮和所述第三辊轮将附着于第二辊轮上的所述锂带覆合于所述基材；沿所述锂带的走带方向，在所述第一辊轮和所述第二辊轮的上游，通过涂布机构同时向所述第二表面和向至少一个所述第一表面涂布脱模剂。
根据本申请实施例的补锂方法，能够实现锂带的第一表面脱模剂涂布，避免补锂工艺中出现锂带粘辊的情况，提高补锂生产安全性。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请一实施例提供的补锂装置的结构示意图；
图2为本申请一实施例提供的补锂工艺的原理示意图；
图3示出了本申请一实施例的涂布辊的结构示意图；
图4示出了本申请一实施例的涂布机构的结构示意图；
图5为本申请一实施例的涂布机构的工作状态示意图；
图6为本申请另一实施例的涂布机构的结构示意图；
图7为本申请又一实施例的涂布机构的结构示意图；
图8为本申请一实施例的补锂装置在补锂过程的示意图；
图9为本申请一实施例的清理机构的一示意图；
图10为本申请一实施例的清理机构的另一示意图；
图11为本申请一实施例的补锂方法的示意性流程图；
在附图中，附图并未按照实际的比例绘制。
标记说明：100-覆合机构；110-第一辊轮；120-第二辊轮；130-第三辊轮；140-第四辊轮；200-涂布机构；210-涂布辊；211-凹槽；2111-第一侧面；2112-底面；α-夹角；220-定辊；221-凸台；222-缺口；223-定辊刮刀；230-支撑辊；250-喷嘴；260-容纳槽；300-锂带输送机构；310-锂带放卷辊；400-基材输送机构；410-基材放卷辊；420-基材收卷辊；500-预压机构；510-预压辊；610-牵引辊；620-牵引带；700-清理机 构；710-清洁刮刀；720-清洁毛刷；730-吸尘组件；L-锂带；L1-第一表面；L2-第二表面；L3-第三表面；P-基材。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限定本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“附接”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，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请中出现的“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请中，所提及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，本申请中所提及的电池可以包括电池模块或电池包等。
锂离子电池能够实现重复充放电功能的核心构件为电池单体中的电极组件，电极组件包括正极极片、负极极片和隔离膜。锂离子电池主要依靠锂离子在正极极片和负极极片之间移动来工作。
其中，正极极片包括正极集流体和涂覆于正极集流体表面的正极活性物质层， 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。通常情况下，在锂离子电池中，正极集流体可以为铝箔，正极活性物质层可以为三元锂、锰酸锂、钴酸锂或磷酸铁锂等。
负极极片包括负极集流体和涂覆于负极集流体表面的负极活性物质层，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。通常情况下，在锂离子电池中，负极集流体可以为铜箔，负极活性物质层可以为碳或硅等。
锂离子电池在首次充放电过程中会形成固体电解质膜，而固体电解质膜会消耗部分锂，造成锂的损失，进而导致锂离子电池容量的损失。为了补偿锂离子电池在首次充放电过程中的活性锂损失，在极片的成型过程中，需要预先在极片的活性物质层上补充活性锂。目前，通常是通过补锂装置在极片表面进行覆锂来减少锂离子电池在首次充电过程中容量的不可逆降低，进而来提升锂离子电池的容量和循环寿命。
极片补锂装置可用于在极片上补锂，以提高锂离子电池的容量和循环寿命。本申请实施例提及的基材可以为金属箔材即集流体，也可以为设置有活性物质层的极片。
基材的补锂工艺主要包括压延工艺和覆合工艺。压延工艺是将锂带压薄以形成锂膜；而覆合工艺则是通过辊压将锂膜覆合到基材的表面。需要指出的是，为了便于后续行文，实际意义上的锂膜也以锂带命名进行说明。
在现有技术中，补锂装置通过覆合机构压延锂带并将压延后的锂带覆合至基材上，补锂过程中，常常出现冒烟、起火等安全隐患。
发明人发现冒烟、起火的主要原因是锂带粘辊，而锂带粘辊主要是锂带的边缘部分附着于辊轮，进一步研究发现，锂带在被压延后，锂带的宽度方向会发生延展，而延展部分的锂带由于没有脱模剂，在覆合过程中，延展部分的锂带与辊轮的辊面的粘附力大于与基材的粘附力，导致延展部分的锂带依旧附着于辊轮的辊面而造成粘辊，进而造成冒烟、起火等安全隐患。
鉴于此，本申请提供一种补锂装置，该补锂装置包括覆合机构和涂布机构，覆合机构包括依次相邻设置的第一辊轮、第二辊轮和第三辊轮，涂布机构设置在覆合机构的上游，通过涂布机构同时向锂带的面向第二辊轮的第二表面和向锂带的宽度方向上的至少一个第一表面涂布脱模剂，第二表面和第一表面的脱模剂跟随锂带的延展而扩散，使得锂带的延展部分具有脱模剂，当锂带跟随第二辊轮转动至第三辊轮与第二辊轮之间时，锂带能够从第二辊轮脱离而覆合于基材，避免锂带粘辊，提高了生产安全性。
图1示出了本申请一实施例的补锂装置的结构示意图；图2示出了本申请一实施例的补锂工艺的原理示意图。如图1所示，补锂装置包括覆合机构100及涂布机构200。
覆合机构100包括依次相邻设置的第一辊轮110、第二辊轮120和第三辊轮130，如图2所示，第一辊轮110和第二辊轮120用于压延锂带L，且压延后锂带L附着于第二辊轮120，实现压延工艺；第二辊轮120和第三辊轮130用于将附着于第二辊 轮120上的锂带L覆合于基材P，实现覆合工艺。
第一辊轮110、第二辊轮120及第三辊轮130相互平行设置，也即三者的轴线均平行。
第一辊轮110和第二辊轮120相对设置，第一辊轮110和第二辊轮120之间的辊隙用于供锂带L穿过，第一辊轮110和第二辊轮120配合实现压延功能。第二辊轮120和第三辊轮130相对设置，第二辊轮120和第三辊轮130之间的辊隙用于供基材P穿过，第二辊轮120和第三辊轮130配合实现覆合功能。
需要指出的是，第一辊轮110、第二辊轮120和第三辊轮130的设置形式不作限定，例如，第一辊轮110、第二辊轮120和第三辊轮130可以沿水平方向依次布设，或者，第一辊轮110、第二辊轮120和第三辊轮130也可以沿竖直方向依次布设，又或者，第一辊轮110、第二辊轮120和第三辊轮130还可以呈L形布设。第一辊轮110、第二辊轮120及第三辊轮130具体设置为哪种布设形式根据补锂装置匹配的工况需求而定，本实施例中不限定第一辊轮110、第二辊轮120和第三辊轮130的布设形式，本实施例中仅以第一辊轮110、第二辊轮120和第三辊轮130沿水平方向依次布设为例说明。
锂带L包括沿锂带L的宽度方向相对的两个第一表面L1(请参照图2所示)、以及面向第二辊轮120的第二表面L2，锂带L的宽度方向与第二辊轮120的轴向平行，即第一表面L1为锂带L的窄侧面。
锂带L具有一定的塑性，当其被送入第一辊轮110和第二辊轮120之间时，由于第一辊轮110和第二辊轮120之间的辊隙小于锂带L的厚度，锂带L会因受到挤压而产生宽度方向的延展，并形成具有一定厚度的薄膜状结构，以便于其在后续的覆合工序覆合至基材P的表面上。
如图1所示，沿锂带L的走带方向，涂布机构200设于覆合机构100的上游，涂布机构200被配置为同时向第二表面L2和向至少一个第一表面L1涂布脱模剂。
需要指出的是，上游和下游是针对锂带L的加工工艺中的前后顺序，与空间位置无关，例如，涂布机构200设于覆合机构100的上游是指，锂带L先经过涂布机构200涂布脱模剂，然后，再经过覆合机构100的压延覆合工艺，最终覆合至基材P上。
根据本申请实施例的补锂装置，结合图2所示，通过涂布机构200同时向第二表面L2和第一表面L1涂布脱模剂，第二表面L2和第一表面L1的脱模剂跟随锂带L的延展而扩散，使得锂带L的延展部分具有脱模剂，当锂带L跟随第二辊轮120转动至第三辊轮130与第二辊轮120之间时，由于锂带L上涂覆有脱模剂，使得锂带L能够从第二辊轮120转移覆合至基材P上，锂带L不容易粘附在第二辊轮120上，缓解锂带L粘辊导致冒烟、起火等问题，提高了生产安全性。
需要指出的是，涂布机构200可以仅向锂带L的一个第一表面L1涂布脱模剂，也可以同时向锂带L的两个第一表面L1涂布脱模剂。当涂布机构200仅向锂带L的一个第一表面L1涂布脱模剂时，为了保证锂带L的两个第一表面L1均能够涂布脱模剂，补锂装置还设置另外一个涂布机构，通过两个涂布机构分别向锂带L的宽度方向的两个第一表面L1涂布脱模剂。为了保证锂带L表面的脱模剂涂布均匀，本申请实 施例的涂布机构200可以同时向锂带L的第二表面L2及两个第一表面L1涂布脱模剂。
图3示出了本申请一实施例的涂布辊210的结构示意图；图4示出了本申请一实施例的涂布机构200的结构示意图。
根据本申请的一些实施例，如图3和图4所示，涂布机构200包括涂布辊210，涂布辊210的辊面上设有用于容纳锂带L的凹槽211，凹槽211被配置为同时向第二表面L2和向至少一个第一表面L1涂布脱模剂。由于凹槽211能够容纳锂带L，凹槽211向锂带L涂布脱模剂的方式为：锂带L从凹槽211中经过时，凹槽211的槽面上粘附的脱模剂同时附着在锂带L的第一表面L1和第二表面L2。
根据本申请的一些实施例，凹槽211为绕涂布辊210的轴线设置的环形凹槽。涂布辊210转动时，环形的凹槽211持续向锂带L的第一表面L1和第二表面L2涂布脱模剂，提高涂布效率。
根据本申请的一些实施例，如图3和图4所示，凹槽211包括底面2112和沿涂布辊210的轴向相对的两个第一侧面2111，底面2112被配置为向第二表面L涂布脱模剂，两个第一侧面2111被配置为向两个第一表面L1涂布脱模剂。底面2112和两个第一侧面2111均为凹槽211的槽面。底面2112连接两个第一侧面2111，以便于容纳锂带L；当底面2112和第一侧面2111涂布有脱模剂时，在锂带L进入凹槽211后，底面2112的脱模剂和第一侧面2111的脱模剂能够同时转移至锂带L的第二表面L2和第一表面L1，完成同时向第二表面L2和第一表面L1涂布脱模剂。通过底面2112和两个第一侧面2111同时向锂带L的第二表面L2和两个第一表面L1涂布脱模剂，能够保证涂布效果，涂布效率高。
另外，在锂带L走带过程中，锂带L容易发生位置偏移，在当锂带L与凹槽211配合时，由于两个第一侧面2111与两个第一表面L1对应，两个第一侧面2111还能够起到限位的作用，保证锂带L的第一表面L1和第二表面L2均能够涂布有脱模剂。
如图3和图4所示，第一侧面2111与底面2112之间具有夹角α。
例如，在本申请的一些实施例中，夹角α可以为直角。
又例如，在本申请的一些实施例中，如图3所示，夹角α也可以为钝角。也即，第一侧面2111和底面2112倾斜设置，此种情况下，第一侧面2111具有较大的面积，故而第一表面L1能够涂布较多的脱模剂，以保证锂带L被压延后在锂带L的延展部分具有足够的脱模剂。
可选地，夹角α为135°，便于加工。
根据本申请的一些实施例，如图4所示，涂布机构200还包括定辊220，定辊220的至少一部分嵌入凹槽211且与凹槽211之间具有间隙，定辊220用于控制附着在涂布辊210上的脱模剂的厚度。嵌入凹槽211的部分定辊220与凹槽211之间的间隙是指，定辊220的部分结构的轮廓与凹槽221的轮廓匹配，且该部分定辊220嵌入凹槽211内，与凹槽211的槽面之间形成间隙，该间隙用于容许脱模剂通过。通过控制定辊220和凹槽211之间的间隙宽度，能够控制附着在涂布辊210上的脱模剂的厚 度。也即，定辊220为固定设置，涂布辊210为转动设置，涂布辊210能够相对于定辊220转动。通过定辊220与凹槽211配合，能够控制涂布辊210上的脱模剂厚度，保证锂带L的表面附着的脱模剂的厚度一致。
具体为，当锂带L进入凹槽211内后，由于定辊220与涂布辊210之间的间隙固定，通过涂布辊210的转动，定辊220将涂布辊210上脱模剂超厚的部分刮平，使涂布辊210上的脱模剂厚度大致等于间隙的宽度，从而涂布辊210上的脱模剂的厚度一致。在涂布辊210与锂带L配合时，涂布辊210上的脱模剂转移至锂带L的第一表面L1，完成向第一表面L1涂布脱模剂。由于涂布辊210上的脱模剂厚度均匀，能够缓解由于涂布辊210不能均匀提供脱模剂而涂布不均匀的问题，使得第一表面L1上的脱模剂厚度一致。
根据本申请的一些实施例，如图4所示，定辊220的辊面上设有凸台221，凸台221嵌入凹槽211且与凹槽211之间具有间隙。也即，凸台221的轮廓与凹槽211的轮廓匹配，凸台221嵌入凹槽211的深度值决定凸台221与凹槽211之间的间隙大小，通过调节凸台221嵌入凹槽211的深度，能够改变凸台221与凹槽211之间的间隙，进而控制涂布辊210上的脱模剂的厚度。通过凸台221与凹槽211之间的间隙控制附着在涂布辊210上的脱模剂的厚度，结构简单，操作便捷。
根据本申请的一些实施例，凸台221为绕定辊220的轴线设置的环形凸台，便于加工。
图5示出了本申请一实施例的涂布机构200的工作状态示意图。根据本申请的另一些实施例，如图5所示，凸台221绕定辊220的轴线设置，且凸台221在定辊220的周向上具有缺口222，换句话说，在环形结构的凸台221的基础上，凸台221形成有缺口222，用于控制涂布辊210上的脱模剂的厚度。具体为，在定辊220的周向上，缺口222将环形的凸台221切断，同时，缺口222沿定辊220的轴线的方向贯穿凸台221，以便于在凸台221的缺口222的靠近凹槽211的边缘处形成定辊刮刀223，定辊刮刀223与凹槽211的轮廓匹配，定辊刮刀223与凹槽211之间的间隙确定附着于凹槽211的槽面的脱模剂的厚度，进而控制涂布辊210上的脱模剂的厚度。
在涂布辊210工作过程中，绕涂布辊210的转向，涂布辊210先经过定辊220，与定辊220配合控制涂布辊210上的脱模剂的厚度，然后涂布辊210再将脱模剂涂布于锂带L的第二表面L2和第一表面L1。
根据本申请的一些实施例，定辊220位于涂布辊210的背离锂带L的一侧。也即，定辊220和锂带L在涂布辊210的转向上呈180°设置。该种设置方式，合理利用安装空间，避免影响锂带L的走带。
需要指出的是，定辊220的设置位置可以根据实际补锂工况确定，在保证不影响锂带L的走带，且不与其他部件干涉的情况下，定辊220可以设置于涂布辊210的转向的任意位置，只要能够保证涂布辊210上的脱模剂厚度一致即可。
根据本申请的一些实施例，涂布机构200还可以包括脱模剂挤出机构(图中未示出)，脱模剂挤出机构用于将脱模剂挤出到涂布辊210和定辊220之间。例如，通过导管连接储料设备，通过泵送机构将脱模剂经由导管挤出至涂布辊210和定辊220 之间。
根据本申请的一些实施例，如图4和图5所示，涂布机构200还包括支撑辊230，锂带L从支撑辊230和涂布辊210之间穿过。也即，支撑辊230与锂带L的背离第二辊轮120(参照图1所示)一侧的第三表面L3接触，并支撑第三表面L3(参照图4)。在锂带L走带的过程中，锂带L会发生晃动，通过设置支撑辊230与涂布辊210的配合，将锂带L限制于支撑辊230和涂布辊210之间，以保证锂带L的第一表面L1和第二表面L2能够同时被涂布脱模剂，保证锂带L的表面附着的脱模剂均匀。例如，如图5所示，支撑辊230与涂布辊210平行设置，涂布辊210的凹槽211尺寸略大于锂带L的尺寸，支撑辊230的辊面与涂布辊210的辊面贴合，支撑辊230将锂带L压于涂布辊210的凹槽211内，支撑辊230与锂带L的接触应力稳定，保证锂带L与凹槽211之间的间隙固定，进而保证锂带L的表面涂布的脱模剂均匀。
需要指出的是，支撑辊230的轴向的尺寸大于涂布辊210的凹槽211在涂布辊210的轴向上的尺寸，并且，支撑辊230在与涂布辊210配合时，沿锂带L的厚度方向的投影面上，凹槽211的投影位于支撑辊230的投影内。
另外，由于支撑辊230将锂带L压入凹槽211内，能够通过凹槽211的两个第一侧面2111限制锂带L在宽度方向的移动，起到限位的作用。
当支撑辊230与涂布辊210配合时，支撑辊230将锂带L压入凹槽211内，跟随涂布辊210的转动，凹槽211可以同时向锂带L的第二表面L2及两个第一表面L1涂布脱模剂，保证锂带L的表面附着的脱模剂均匀，保证涂布效果。
图6示出了本申请另一实施例的涂布机构200的结构示意图；图7示出了本申请又一实施例的涂布机构200的结构示意图。涂布机构200除了上述的通过涂布辊210实现脱模剂转移涂布方式外，根据本申请的另一些实施例，涂布机构200还可以为喷涂式机构，也即，如图6和图7所示，涂布机构200包括喷嘴250，喷嘴250被配置为同时向锂带L的第二表面L2和第一表面L1涂布脱模剂。涂布机构200设置有用于容纳锂带L的容纳槽260，容纳槽260至少能够容纳锂带L的第二表面L2和两个第一表面L1。例如，如图6所示，容纳槽260可以容纳锂带L的第二表面L2和两个第一表面L1；又例如，如图7所示，容纳槽260可以容纳锂带L的包括第二表面L2和两个第一表面L1在内的所有表面，也即容纳槽260为环形槽，锂带L从容纳槽260中穿过。需要指出的是，图6和图7仅为涂布机构200的喷嘴250设置方式示意图，其他部件并未公开。
图8示出了本申请一实施例的补锂装置在补锂过程的示意图。
通常情况下，如图8所示，补锂装置还包括锂带输送机构300和基材输送机构400，锂带输送机构300用于将锂带L送入第一辊轮110和第二辊轮120之间，基材输送机构400用于将基材P送入第二辊轮120和第三辊轮130之间。
锂带输送机构300包括锂带放卷辊310，锂带放卷辊310被配置为设置锂带L，例如，锂带L可通过卷绕的方式设置于锂带放卷辊310，通过锂带放卷辊310的转动，将锂带L送入第一辊轮110和第二辊轮120之间。基材输送机构400包括基材放卷辊410和基材收卷辊420。基材放卷辊410和基材收卷辊420用于设置基材P，例 如，基材P可通过卷绕的方式设置在基材放卷辊410和基材收卷辊420上。
在锂带L被送入第二辊轮120和第三辊轮130的同时，由于基材输送机构400将基材P送入第二辊轮120和第三辊轮130之间，此时，锂带L和基材P同时位于第二辊轮120和第三辊轮130之间的辊隙中。相较于第二辊轮120的辊面，基材P具有更大的表面粗糙度，锂带L与基材P之间的粘附力大于锂带L与第二辊轮120之间的粘附力，当锂带L和基材P接触并受到辊压时，锂带L会附着在基材P上，而随着基材P的输送，基材P会对锂带L产生牵引，并使得锂带L从第二辊轮120的辊面剥离，如此便实现了对基材P的覆锂，也即完成对基材P的补锂工艺。
为了提升覆合机构100的适用性，该补锂装置还包括辊隙调节机构(图中未示出)，用于调整第一辊轮110和第二辊轮120之间的辊隙，以及用于调整第二辊轮120和第三辊轮130之间的辊隙，从而调控覆合机构100的压延效果和覆合效果，进而适配不同的补锂需求。
根据本申请的一些实施例，如图8所示，该补锂装置还包括预压机构500，沿锂带L的走带方向，预压机构500设置于涂布机构200的上游，预压机构500用于对锂带L进行预压延，以提高锂带L的厚度一致性，从而显著地改善在锂带L的表面涂布脱模剂的效果。锂带L的厚度一致性与制造成本相关，降低对锂带L的厚度一致性的要求，可以降低锂带L来料的成本。如图8所示，预压机构500包括两个预压辊510，锂带L先从两个预压辊510之间穿过，再经过涂布机构200。
在预压机构500的辊压作用下，锂带L的压缩量为10％-20％。由于锂带L的压缩量较小，不易黏附在预压辊510上，所以两个预压辊510可设置在涂布机构200的上游。
根据本申请的一些实施例，第一辊轮110的辊径小于第二辊轮120的辊径，通过大小辊径搭配，可以实现异径轧制。相比于同径轧制，异径轧制增大第二辊轮120与锂带L的接触面积，改善锂带L与第一辊轮110的咬入效果和锂带L与第二辊轮120的咬入效果，锂带L更容易粘附在第二辊轮120的辊面。
由于第一辊轮110的辊径较小，在压延的过程中，第一辊轮110容易变形，降低压延的厚度一致性。根据本申请的一些实施例，覆合机构100还包括第四辊轮140，第四辊轮140与第一辊轮110相对设置且位于第一辊轮110的远离第二辊轮120的一侧。第四辊轮140的辊径大于第一辊轮110的辊径。第四辊轮140和第一辊轮110彼此接触且相对转动，这样可以减小第一辊轮110在长期使用过程中的变形，提高锂带L压延的厚度一致性，延长装置的使用寿命。
根据本申请的一些实施例，如图8所示，该补锂装置还包括牵引辊610和牵引带620，牵引带620连接于牵引辊610，沿锂带L的走带方向，牵引辊610设置于第一辊轮110的下游。牵引辊610为主动辊，当需要牵引锂带L走带时，可将牵引带620连接到锂带L，然后通过牵引辊610的转动带动锂带L走带。当锂带L跟随牵引带620进入第一辊轮110和第二辊轮120之间时，由于第一辊轮110和第二辊轮120之间的辊隙小于锂带L的厚度，在辊压力的作用下，压薄后的锂带L与牵引带620分离，锂带L粘接于第二辊轮120的辊面。
如果不设置牵引辊610和牵引带620，那么需要手动将锂带L牵引到第一辊轮110和第二辊轮120之间，并由第一辊轮110和第二辊轮120牵引锂带L走带。这样会导致涂布机构200无法在锂带L的初始段涂布脱模剂，造成锂带L的初始段粘附在第一辊轮110或第二辊轮120的表面，此时，锂带L的初始段无法转移到基材P的表面，造成锂带L的浪费，同时，降低第一辊轮110和第二辊轮120的辊面的平整度，影响后面的锂带L的压延。
将锂带L覆合到基材P之后，第二辊轮120的辊面会残留锂屑和脱模剂，为避免影响锂带L的压延和覆合，需要及时去除残留在第二辊轮120上的残留物。
如图8所示，该补锂装置还包括清理机构700，清理机构700用于清理第二辊轮120的辊面。图9示出了本申请一实施例的清理机构700的一示意图；图10示出了本申请一实施例的清理机构700的另一示意图。如图9和图10所示，清理机构700包括清洁刮刀710、清洁毛刷720及吸尘组件730，清洁刮刀710用于与第二辊轮120的辊面相抵接，清洁毛刷720用于与第二辊轮120的辊面相接触，吸尘组件730用于吸除清洁刮刀710刮下的锂屑和脱模你。随着第二辊轮120的转动，清洁刮刀710将第二辊轮120的辊面上残留的锂屑和脱模剂刮除；清洁毛刷720位于清洁刮刀710的下游，用于进一步清洁第二辊轮120的辊面；吸尘组件730可以设置于清洁刮刀710的侧方，以便于通过负压作用吸除刮下的锂屑和脱模剂。
下文将描述根据本申请实施例提供的补锂方法，该补锂方法采用上述的补锂装置。图11示出了本申请一实施例的补锂方法的示意性流程图，如图11所示，该补锂方法包括：
S100，将锂带L送入第一辊轮110和第二辊轮120之间，通过第一辊轮110和第二辊轮120压延锂带L，压延后锂带L附着于第二辊轮120，锂带L包括沿锂带L的宽度方向相对的两个第一表面L1、以及面向第二辊轮120的第二表面L2；
S200，将基材P送入第二辊轮120和第三辊轮130之间，通过第二辊轮120和第三辊轮130将附着于第二辊轮120上的锂带L覆合于基材P；
S300，沿锂带L的走带方向，在第一辊轮110和第二辊轮120的上游，通过涂布机构200同时向第二表面L2和向至少一个第一表面L1涂布脱模剂。
根据本申请实施例的补锂方法，通过在锂带L被压延前，在锂带L的宽度方向的第一表面L1涂布脱模剂，使得锂带L被压延后的延展部分具有足够的脱模剂，避免锂带L粘辊，提高生产的安全性。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (13)

  1. 一种补锂装置，用于将锂带覆合于基材，包括：
    覆合机构，包括依次相邻设置的第一辊轮、第二辊轮和第三辊轮，所述第一辊轮和所述第二辊轮用于压延所述锂带，且压延后所述锂带附着于所述第二辊轮，所述第二辊轮和所述第三辊轮用于将附着于所述第二辊轮上的所述锂带覆合于所述基材；
    所述锂带包括沿所述锂带的宽度方向相对的两个第一表面、以及面向所述第二辊轮的第二表面；
    涂布机构，沿所述锂带的走带方向，所述涂布机构设于所述覆合机构的上游，所述涂布机构被配置为同时向所述第二表面和向至少一个所述第一表面涂布脱模剂。
  2. 根据权利要求1所述的补锂装置，其中，所述涂布机构包括涂布辊，所述涂布辊的辊面上设有用于容纳所述锂带的凹槽，所述凹槽被配置为同时向所述第二表面和向至少一个所述第一表面涂布脱模剂。
  3. 根据权利要求2所述的补锂装置，其中，所述凹槽为绕所述涂布辊的轴线设置的环形凹槽。
  4. 根据权利要求2所述的补锂装置，其中，所述凹槽包括底面和沿所述涂布辊的轴向相对的两个第一侧面，所述底面被配置为向所述第二表面涂布脱模剂，两个所述第一侧面被配置为向两个所述第一表面涂布脱模剂。
  5. 根据权利要求4所述的补锂装置，其中，所述第一侧面与所述底面之间具有夹角，所述夹角为钝角。
  6. 根据权利要求2-5中任一项所述的补锂装置，其中，所述涂布机构还包括定辊，所述定辊的至少一部分嵌入所述凹槽且与所述凹槽之间具有间隙，所述定辊用于控制附着在所述涂布辊上的脱模剂的厚度。
  7. 根据权利要求6所述的补锂装置，其中，所述定辊的辊面上设有凸台，所述凸台嵌入所述凹槽且与所述凹槽之间具有间隙。
  8. 根据权利要求7所述的补锂装置，其中，所述凸台为绕所述定辊的轴线设置的环形凸台。
  9. 根据权利要求8所示的补锂装置，其中，所述凸台形成有缺口，用于控制所述涂布辊上的脱模剂的厚度。
  10. 根据权利要求6-9中任一项所述的补锂装置，其中，所述定辊位于所述涂布辊的背离所述锂带的一侧。
  11. 根据权利要求6-9中任一项所述的补锂装置，其中，所述涂布机构还包括：
    脱模剂挤出机构，用于将脱模剂挤出到所述涂布辊和所述定辊之间。
  12. 根据权利要求2-11中任一项所述的补锂装置，其中，所述涂布机构还包括：
    支撑辊，所述锂带从所述支撑辊和所述涂布辊之间穿过。
  13. 一种补锂方法，用于将锂带覆合于基材，包括：
    将所述锂带送入第一辊轮和第二辊轮之间，通过所述第一辊轮和所述第二辊轮压延所述锂带，压延后所述锂带附着于所述第二辊轮，所述锂带包括沿所述锂带的宽度 方向相对的两个第一表面、以及面向所述第二辊轮的第二表面；
    将所述基材送入所述第二辊轮和第三辊轮之间，通过所述第二辊轮和所述第三辊轮将附着于第二辊轮上的所述锂带覆合于所述基材；
    沿所述锂带的走带方向，在所述第一辊轮和所述第二辊轮的上游，通过涂布机构同时向所述第二表面和向至少一个所述第一表面涂布脱模剂。
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CN115692626B (zh) 2023-10-20
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US20230352648A1 (en) 2023-11-02
CN115692626A (zh) 2023-02-03
MX2023006313A (es) 2023-06-14

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