WO2023035780A1 - Dispositif d'ajout de lithium - Google Patents

Dispositif d'ajout de lithium Download PDF

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Publication number
WO2023035780A1
WO2023035780A1 PCT/CN2022/106662 CN2022106662W WO2023035780A1 WO 2023035780 A1 WO2023035780 A1 WO 2023035780A1 CN 2022106662 W CN2022106662 W CN 2022106662W WO 2023035780 A1 WO2023035780 A1 WO 2023035780A1
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WO
WIPO (PCT)
Prior art keywords
lithium
roll
pole piece
calendering
auxiliary film
Prior art date
Application number
PCT/CN2022/106662
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English (en)
Chinese (zh)
Inventor
李云明
王学飞
Original Assignee
蜂巢能源科技股份有限公司
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Application filed by 蜂巢能源科技股份有限公司 filed Critical 蜂巢能源科技股份有限公司
Publication of WO2023035780A1 publication Critical patent/WO2023035780A1/fr

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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 production and manufacture of lithium batteries, for example, to a lithium replenishment device.
  • lithium-ion batteries Due to the advantages of high energy density, long cycle life and no memory effect, lithium-ion batteries are widely used in consumer electronics and new energy vehicles.
  • the loss of lithium caused by the formation of the solid electrolyte film will limit the energy density of the lithium-ion battery, especially in the silicon-based negative electrode material system, and in the cycle The loss of active lithium caused by side reactions in the process will shorten the cycle life.
  • Lithium supplementation device uses a lithium replenishment device to supplement lithium to the pole piece, so as to achieve the purpose of improving the energy density and cycle life of the lithium ion battery.
  • Lithium supplementation device has the following two forms:
  • the first type is that the lithium replenishing device adopts the form of split calendering one-time coating.
  • the lithium replenishing device includes a pole piece conveying mechanism, a lithium belt conveying mechanism, an auxiliary film conveying mechanism and a transfer mechanism.
  • the pole piece conveying mechanism is set to transport the pole piece
  • the lithium belt conveying mechanism is set to convey the lithium belt
  • the auxiliary film conveying mechanism is set to convey the auxiliary film
  • the two sides of the lithium belt can be respectively abutted against the auxiliary film and the transfer mechanism, so as to bond the rolled lithium belt to the transfer mechanism
  • the transfer mechanism transports the lithium belt to the pole piece, thereby realizing the process of lithium supplementation for the pole piece.
  • the auxiliary film Since the two sides of the lithium ribbon can contact the auxiliary film and the transfer mechanism respectively, the auxiliary film provides support for the lithium ribbon, and the auxiliary film only covers the surface of the lithium ribbon once during the lithium replenishment process. As far as the electrode is concerned, the auxiliary film with double the area of the pole piece needs to be consumed, and the auxiliary film cannot be reused, resulting in high cost of lithium supplementation.
  • the second type is that the lithium supplementary device adopts the form of integral calendering without an auxiliary film.
  • the transfer mechanism of the lithium supplementary device not only plays the role of transfer, but also plays the role of calendering.
  • the transfer mechanism needs to have a relatively Small size to roll thicker lithium ribbon to thinner lithium foil; for the transfer process, the transfer mechanism needs to have a larger size to reduce the extension effect of the pole piece, and the transfer mechanism is difficult to be compatible with the calendering process and Problems with the transfer process.
  • the application provides a lithium supplementation device, which can meet the functional requirements of calendering and transfer at the same time, realize the circulation of the auxiliary membrane, and save production costs.
  • a lithium supplement device comprising:
  • the pole piece conveying mechanism is configured to convey the pole piece
  • the lithium belt conveying mechanism is set to convey the lithium belt
  • a calendering mechanism including a first calendering roll and a second calendering roll, a gap capable of accommodating the lithium belt is provided between the first calendering roll and the second calendering roll;
  • a transfer roll located between the second calender roll and the pole piece and abutting against the pole piece, an auxiliary film is sleeved between the second calender roll and the transfer roll;
  • both sides of the lithium ribbon abut against the first calendering roll and the auxiliary film respectively, and the calendering mechanism is configured to pass through the gap
  • the lithium ribbon is rolled into a lithium foil and adhered to the auxiliary film, and the transfer roller is configured to attach the lithium foil adhered to the auxiliary film to the pole piece.
  • Fig. 1 is a schematic structural diagram of a lithium supplementation device provided in an embodiment of the present application
  • FIG. 2 is a schematic structural view of the surface of a transfer roller in a lithium supplementation device provided in an embodiment of the present application;
  • FIG. 3 is a schematic structural view of the surface of a transfer roller in another lithium supplementation device provided in an embodiment of the present application.
  • Electrode conveying mechanism 2. Lithium belt conveying mechanism; 3. Support roller; 4. Calendering mechanism; 5. Release agent coating mechanism; 6. Cleaning mechanism; 7. Transfer roller;
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components.
  • connection can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components.
  • a first feature being "on” or “under” a second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact. contact but through additional feature contact between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • "Below”, “beneath” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the lithium replenishing device includes a pole piece conveying mechanism 1, a lithium belt conveying mechanism 2, a calendering mechanism 4, and a transfer roller 7, the pole piece conveying mechanism 1 is set to convey pole pieces, and the lithium belt conveying mechanism 2 is set to convey Lithium strip, calendering mechanism 4 is set to calendering lithium strip, is wound with auxiliary film 100 between calendering mechanism 4 and transfer roller 7, and lithium strip can be calendered into lithium foil and adheres to the surface of auxiliary film 100, and auxiliary film 100 is Lithium straps provide support and transfer.
  • the transfer roller 7 is located between the calendering mechanism 4 and the pole piece and abuts against the pole piece. The transfer roller 7 plays the role of intermediate transfer, and the lithium foil is attached to the pole piece through the transfer roller 7 .
  • the pole piece conveying mechanism 1 includes a pole piece discharge roller 11 and a pole piece take-up roller 12, the pole piece is respectively wound around the pole piece discharge roller 11 and the pole piece take-up roller 12, and the pole piece discharge roller 11 is set as a pole piece
  • the feeding of the pole piece, the pole piece receiving roller 12 is set to complete the collection of the lithium supplemented pole piece.
  • At least one of the pole piece discharging roller 11 and the pole piece receiving roller 12 can rotate to drive the movement of the pole piece, thereby realizing the conveying process of the pole piece.
  • the lithium belt conveying mechanism 2 includes a lithium belt discharge roller, the lithium belt is wound on the outside of the lithium belt discharge roller, the lithium belt discharge roller is set as the discharge of the lithium belt, and the lithium belt discharge roller can rotate to drive the movement of the lithium belt , so as to realize the conveying process of the lithium belt.
  • the auxiliary film 100 only covers the surface of the lithium strip at one time during the lithium supplementation process, for a pole piece that needs lithium supplementation on both sides, the auxiliary film 100 with double the area of the pole piece needs to be consumed, and the auxiliary film 100 cannot Repeated use causes the cost of lithium supplementation to be too high.
  • the transfer roller 7 has the problem that the two processes of the calendering process and the transfer process cannot be compatible.
  • the calendering mechanism 4 includes a first calendering roll 41 and a second calendering roll 42, a gap that can accommodate and calender the lithium band is provided between the first calendering roll 41 and the second calendering roll 42, and the lithium band conveying mechanism 2.
  • the lithium ribbon can be released to the gap between the first calender roll 41 and the second calender roll 42. If the thickness of the lithium ribbon is greater than 1 mm, the lithium ribbon is a thick lithium ribbon.
  • the gap between the first calender roll 41 and the second calender roll 42 is The gap between them is small, and under the joint action of the first calender roll 41 and the second calender roll 42, the lithium strip can be rolled to the lithium foil, and the thickness of the lithium foil is between 2 ⁇ m-10 ⁇ m, so as to complete the rolling of the thick lithium strip to ultrathin lithium foil.
  • the auxiliary film 100 is sleeved between the second calender roll 42 and the transfer roll 7, and the second calender roll 42 also realizes the supply of the auxiliary film 100 while realizing the calendering function.
  • Both sides of the lithium ribbon can contact the first calender roll 41 and the auxiliary film 100 respectively, and the auxiliary film 100 provides support and transfer for the lithium ribbon.
  • the lithium ribbon can be rolled into a lithium foil and adhered to the auxiliary film 100, and the lithium foil is attached to the pole piece by the transfer roller 7, and the transfer roller 7 plays the role of transferring the lithium foil.
  • the pole piece conveying mechanism 1 is set to transport the pole piece.
  • the lithium replenishing device provided in this embodiment under the joint action of the transfer roller 7 and the second calender roller 42, enables the auxiliary film 100 to form a closed ring structure to realize the recycling of the auxiliary film 100, which is different from the auxiliary film 100 in the related art.
  • the auxiliary membrane 100 has a high reusability rate and saves production costs.
  • a gap that can accommodate and calender the lithium strip is provided between the first calender roller 41 and the second calender roller 42 to complete the calendering process, and the auxiliary film 100 attaches the lithium foil to the pole piece through the transfer roller 7 to complete the lithium foil
  • the calendering process and the transfer process are separated by adding the auxiliary film 100, which can meet the functional requirements of calendering and transfer at the same time, and has good compatibility.
  • Both the diameters of the first calendering roll 41 and the second calendering roll 42 are d, and the diameter of the transfer roll 7 is D, where d ⁇ D.
  • D the diameter of the transfer roll 7
  • 100mm ⁇ d ⁇ 200mm, 200mm ⁇ D ⁇ 500mm By setting the diameters of the two calendering rolls to be small, and using two calendering rolls with small roll diameters in the calendering process, a thicker lithium ribbon can be rolled to a thinner lithium foil, thereby realizing the preparation of an ultra-thin metal lithium foil.
  • the transfer roller 7 with a large diameter is used in the transfer process to avoid the extension of the pole piece caused by the lithium foil during the transfer process, so as to achieve the purpose of reducing the extension effect of the pole piece.
  • the linear velocity v1 of the first calendering roll 41 is less than or equal to the linear velocity v2 of the second calendering roll 42 , and in this embodiment, 0.4 ⁇ v1/v2 ⁇ 1.
  • the linear velocity v1 of the first calendering roll 41 is less than or equal to the linear velocity v2 of the second calendering roll 42, there is a linear velocity difference between the two calendering rolls to ensure the calendering effect of the lithium foil.
  • the auxiliary film 100 supports the thinned and elongated lithium foil during the rolling process of the lithium ribbon, when the lithium foil needs to be adhered to the pole piece, it is required that the lithium foil can be separated from the auxiliary film 100. If the lithium foil It cannot be separated from the auxiliary film 100, and the auxiliary film 100 is easy to deviate along with the movement of the lithium strip, which affects the transfer of the lithium foil by the transfer roller 7.
  • the total friction force between the auxiliary film 100 and the second calender roll 42 and the transfer roll 7 is greater than the friction force between the auxiliary film 100 and the lithium belt, that is, the auxiliary film 100 and the second calender roll 42
  • the sum of the friction force between them and the friction force between the auxiliary film 100 and the transfer roller 7 is greater than the friction force between the auxiliary film 100 and the lithium ribbon.
  • the auxiliary film 100 is made of polyester fiber (Polyester, PET) film, polypropylene (Polypropylene, PP) film, polyethylene (Polyethylene, PE) film or stainless steel foil, the outer surface of the auxiliary film 100 is smoothed, and the auxiliary film The inner surface of the film 100 is roughened, so that the total friction between the inner surface of the auxiliary film 100 and the second calender roll 42 and the transfer roll 7 is greater than the resistance of the calender mechanism 4 and the transfer roll 7 when rolling the lithium strip, so as to realize the auxiliary
  • the film 100 operates synchronously with the second calender roll 42 and the transfer roll 7 to avoid deviation of the auxiliary film 100 and ensure the lithium replenishment effect of the transfer roll 7 on the pole piece.
  • the surfaces of both sides of the lithium ribbon are coated with a release agent, such as polymethyl Silicones and polyethers.
  • a release agent such as polymethyl Silicones and polyethers.
  • a conductive agent or a lithium salt or a mixture of a conductive agent and a lithium salt is added to the release agent, so that the release agent has ionic, electronic or mixed conductivity, thereby reducing the effect of the release agent on the diffusion of lithium ions.
  • the lithium replenishing device also includes a release agent coating mechanism 5, which is located between the lithium belt conveying mechanism 2 and the first calendering roller 41, and is set to the lithium belt Coating the release agent plays the role of recoating the release agent to the lithium tape.
  • the coating method can be one of spray coating, extrusion coating and transfer coating.
  • the lithium replenishing device also includes a support roll 3, and the auxiliary film 100 is sleeved on the outside of the support roll 3, the second calender roll 42 and the transfer roll 7, under the joint action of the support roll 3, the second calender roll 42 and the transfer roll 7 , so that the auxiliary film 100 can form a closed-loop structure to realize the recycling of the auxiliary film 100.
  • the auxiliary film 100 can form a closed-loop structure to realize the recycling of the auxiliary film 100.
  • the position of the support roller 3 is adjustable, and the tension of the auxiliary film 100 can be controlled by controlling the position of the support roller 3 .
  • the auxiliary film 100 is detachably connected to the support roll 3 and the second calender roll 42 .
  • the auxiliary film 100 can be replaced regularly according to the release force and damage degree of the outer surface during use, so as to ensure that the auxiliary film 100 always has a good auxiliary supporting effect on the lithium ribbon.
  • the lithium replenishment method can also be stripe lithium replenishment.
  • the outer wall of the transfer roller 7 is provided with protrusions 71 .
  • the protrusion 71 can reduce the contact area and increase the pressure. Under the action of the pressure, the lithium foil corresponding to the position of the protrusion 71 can be better transferred to the pole piece.
  • Protrusion 71 can be arranged along the circumference of transfer roller 7 (as shown in Figure 2), and the quantity of protrusion 71 can be a plurality of, and the extension direction of a plurality of protrusions 71 is arranged in parallel with the axial direction of transfer roller 7 and along the transfer roller 7.
  • the circumferential direction of the rollers 7 is distributed in parallel and at intervals to form a transverse stripe structure.
  • Protrusion 71 can be arranged along the axial direction of transfer roller 7 (as shown in Figure 3), the quantity of protrusion 71 can be a plurality of, the extension direction of a plurality of protrusions 71 and the axial direction of described transfer roller 7 are perpendicular to each other and They are distributed in parallel and at intervals along the axial direction of the transfer roller 7 to form a vertical stripe structure.
  • the striped structure is used to improve the uniformity of lithium foil transfer.
  • the cleaning mechanism 6 includes a scraper and a suction nozzle, the scraper is set to separate the residue from the auxiliary film 100, and the suction nozzle is set to suck the residue.
  • the above-mentioned mechanism can be set as one-sided lithium replenishment of the pole piece. If the pole piece needs double-sided lithium supplementation, the lithium belt conveying mechanism 2, the support roller 3, the first calender roller 41, the second calender roller 42, the transfer roller 7, the There are two formulation coating mechanisms 5 and two cleaning mechanisms 6, which are symmetrically arranged on both sides of the pole piece, which is equivalent to two sets of systems simultaneously replenishing lithium on both sides of the pole piece, with good synchronization and high production efficiency.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

L'invention concerne un dispositif d'ajout de lithium. Le dispositif d'ajout de lithium comprend : un mécanisme de transport de pièce polaire configuré pour transporter une pièce polaire ; un mécanisme de transport de bande de lithium configuré pour transporter une bande de lithium ; un mécanisme de calandrage, comprenant un premier rouleau de calandrage et un second rouleau de calandrage, un espace pouvant recevoir une bande de lithium étant disposé entre le premier rouleau de calandrage et le second rouleau de calandrage ; un rouleau de transfert est situé entre le second rouleau de calandrage et la pièce polaire et vient en butée contre la pièce polaire, et un film auxiliaire est emmanché entre le second rouleau de calandrage et le rouleau de transfert ; lorsqu'une bande de lithium est située dans l'espace, deux côtés de la bande de lithium butent respectivement contre le premier rouleau de calandrage et le film auxiliaire ; le mécanisme de calandrage est configuré pour calandrer une bande de lithium à travers l'espace pour former une feuille de lithium, et pour coller celle-ci à un film auxiliaire, et le rouleau de transfert est configuré pour être collé à une pièce polaire de la feuille de lithium collée au film auxiliaire.
PCT/CN2022/106662 2021-09-07 2022-07-20 Dispositif d'ajout de lithium WO2023035780A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202122147500.6 2021-09-07
CN202122147500.6U CN216161767U (zh) 2021-09-07 2021-09-07 一种补锂装置

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WO2023035780A1 true WO2023035780A1 (fr) 2023-03-16

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN216161767U (zh) * 2021-09-07 2022-04-01 蜂巢能源科技有限公司 一种补锂装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003297430A (ja) * 2002-04-03 2003-10-17 Mitsubishi Heavy Ind Ltd 二次電池の製造方法、二次電池電極の製造装置
CN206878096U (zh) * 2017-07-12 2018-01-12 宁德时代新能源科技股份有限公司 压延装置
CN207038628U (zh) * 2017-07-12 2018-02-23 宁德时代新能源科技股份有限公司 极片补锂装置
CN210136958U (zh) * 2019-08-07 2020-03-10 宁德时代新能源科技股份有限公司 用于极片补锂的装置
WO2020150254A1 (fr) * 2019-01-16 2020-07-23 Maxwell Technologies, Inc. Système et procédés de fabrication d'une électrode sèche
CN212434661U (zh) * 2020-09-21 2021-01-29 深圳市镭煜科技有限公司 一种压延卧式补锂一体机
CN216161767U (zh) * 2021-09-07 2022-04-01 蜂巢能源科技有限公司 一种补锂装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003297430A (ja) * 2002-04-03 2003-10-17 Mitsubishi Heavy Ind Ltd 二次電池の製造方法、二次電池電極の製造装置
CN206878096U (zh) * 2017-07-12 2018-01-12 宁德时代新能源科技股份有限公司 压延装置
CN207038628U (zh) * 2017-07-12 2018-02-23 宁德时代新能源科技股份有限公司 极片补锂装置
WO2020150254A1 (fr) * 2019-01-16 2020-07-23 Maxwell Technologies, Inc. Système et procédés de fabrication d'une électrode sèche
CN210136958U (zh) * 2019-08-07 2020-03-10 宁德时代新能源科技股份有限公司 用于极片补锂的装置
CN212434661U (zh) * 2020-09-21 2021-01-29 深圳市镭煜科技有限公司 一种压延卧式补锂一体机
CN216161767U (zh) * 2021-09-07 2022-04-01 蜂巢能源科技有限公司 一种补锂装置

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