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CN-121983512-A - Pole piece, manufacturing method and manufacturing device thereof

CN121983512ACN 121983512 ACN121983512 ACN 121983512ACN-121983512-A

Abstract

The invention discloses a pole piece, a manufacturing method and a manufacturing device thereof, belonging to the technical field of batteries, wherein the pole piece comprises: the active material layer comprises a first active material and a second active material which are adjacently conducted, wherein the first active material is coated on the first coating area, and the second active material is coated on the second coating area. According to the pole piece provided by the embodiment of the invention, the middle tab welding area of the current collector is not covered by the active material layer, so that the welding of the tab and the middle tab welding area is facilitated, the processing technology can be simplified, the processing cost is reduced, dust pollution to the pole piece is prevented, meanwhile, the conductivity of the first active material aligned with the middle tab welding area is larger than that of the second active material staggered with the middle tab welding area, so that the lithium precipitation risk is reduced, the reliability of the pole piece is improved, and the service life of the pole piece is prolonged.

Inventors

  • CHEN LIN
  • LI BIAO
  • WU XIAOHAO
  • TANG YANGYANG

Assignees

  • 深圳欣界能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260130

Claims (10)

  1. 1. A pole piece, comprising: The current collector is provided with a first coating area, a second coating area and a middle tab welding area, the middle tab welding area is positioned in the middle area of the current collector in the length direction of the current collector, the width of the middle tab welding area is smaller than that of the current collector in the width direction of the current collector, the first coating area is aligned with the middle tab welding area, and the second coating area is staggered with the middle tab welding area; An active material layer comprising a first active material and a second active material in contiguous communication, the first active material being coated on the first coated region, the second active material being coated on the second coated region, and the first active material having a conductivity greater than a conductivity of the second active material.
  2. 2. The pole piece of claim 1, wherein the first active material has a greater conductive agent content than the second active material.
  3. 3. A pole piece manufacturing method for manufacturing the pole piece according to claim 1 or 2, comprising: coating the current collector along the length direction of the current collector; The first active material is intermittently discharged to coat the first active material on the first coating area and to avoid the middle tab welding area, and the second active material is continuously discharged to coat the second active material on the second coating area.
  4. 4. A pole piece manufacturing device for manufacturing the pole piece according to claim 1 or 2, comprising: The single-layer die head is provided with a coating slit and a dispensing runner, the dispensing runner is provided with a first feeding hole and a first discharging hole, the coating slit is provided with a second feeding hole and a second discharging hole, the first discharging hole corresponds to the first coating area, and the second discharging hole corresponds to the second coating area; A first buffer tank storing the first active material, the first buffer tank being in selective communication with the first feed port; The second cache tank is used for storing the second active materials and is communicated with the second feed inlet.
  5. 5. The pole piece manufacturing device according to claim 4, wherein islands for reducing the flow area of the dispensing runner are arranged in the dispensing runner.
  6. 6. The pole piece manufacturing device of claim 4, wherein the first buffer tank is in selective communication with the first feed port through a first interstitial valve set.
  7. 7. The pole piece manufacturing device according to claim 6, wherein the number of the dispensing channels is plural, the coating slit is provided with a plurality of second discharge holes, the first discharge hole of each dispensing channel corresponds to one or two first coating areas, and the plurality of second discharge holes corresponds to a plurality of second coating areas one by one; the pole piece manufacturing device further comprises a flow divider, and the first gap valve group is communicated with the first feed inlet of each dispensing runner through the flow divider.
  8. 8. A pole piece manufacturing device for manufacturing the pole piece according to claim 1 or 2, comprising: the double-layer die head is provided with a first slit and a second slit, the first slit is provided with a first feeding hole and a first discharging hole, the second slit is provided with a second feeding hole and a second discharging hole, the first discharging hole corresponds to the first coating area, and the second discharging hole corresponds to the second coating area; A first storage tank storing the first active material, the first storage tank being in selective communication with the first feed inlet; the second storage tank is used for storing the second active materials and is communicated with the second feeding port.
  9. 9. The pole piece manufacturing device of claim 8, wherein the first reservoir tank is in selective communication with the first feed inlet via a second interstitial valve set.
  10. 10. The pole piece manufacturing device of claim 8, wherein the first slit has a plurality of the first discharge openings, the second slit has a plurality of the second discharge openings, and each of the first discharge openings corresponds to one or two of the first coating regions, and the plurality of the second discharge openings corresponds to a plurality of the second coating regions one to one.

Description

Pole piece, manufacturing method and manufacturing device thereof Technical Field The invention relates to the technical field of batteries, in particular to a pole piece, and a manufacturing method and a manufacturing device thereof. Background The polymer lithium ion battery has the advantages of high energy density, high working voltage and the like, and the traditional winding processing mode has high production efficiency, but the electrode lugs are positioned at the heads of the pole pieces, so that the electron transmission path is long, the internal resistance is high, and the charge and discharge rate is limited. Therefore, in the related art, a lug middle-setting method is adopted, and the lug is welded in the middle area of the pole piece, so that the energy density is improved, and the charge and discharge performance is improved. The electrode lug is arranged in a relying mode on a laser cleaning technology, an active material layer on the electrode plate needs to be cleaned through laser, the technology is complex in process and high in equipment cost, dust is difficult to clean after cleaning, the electrode plate is easy to pollute, in addition, the current density of an electrode lug arranged in the electrode lug is high when the electrode lug is charged at a high multiplying power, electrolyte consumption is accelerated, lithium precipitation is easy to cause, and the safety of an electric core is threatened. Disclosure of Invention The present invention aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the invention provides the pole piece, which can prevent dust from polluting the pole piece, and improve the reliability and the service life of the pole piece. The invention also provides a pole piece manufacturing method. The invention also provides a pole piece manufacturing device. The invention also provides another pole piece manufacturing device. The pole piece comprises a current collector, an active material layer and an active material layer, wherein the current collector is provided with a first coating area, a second coating area and a middle-arranged pole lug welding area, the middle-arranged pole lug welding area is located in the middle area of the current collector in the length direction of the current collector, the width of the middle-arranged pole lug welding area is smaller than that of the current collector in the width direction of the current collector, the first coating area is aligned with the middle-arranged pole lug welding area, the second coating area is staggered with the middle-arranged pole lug welding area, the active material layer comprises a first active material and a second active material which are adjacently conducted, the first active material is coated on the first coating area, the second active material is coated on the second coating area, and the conductivity of the first active material is larger than that of the second active material. According to the pole piece provided by the embodiment of the invention, the middle-arranged pole lug welding area of the current collector is not covered by the active material layer, so that the welding of the pole lug and the middle-arranged pole lug welding area is facilitated, the processing technology can be simplified, the processing cost is reduced, dust pollution to the pole piece in the process of removing the active material layer by laser is avoided, meanwhile, the conductivity of the first active material aligned with the middle-arranged pole lug welding area is higher than that of the second active material staggered with the middle-arranged pole lug welding area, so that the lithium precipitation risk is reduced, the reliability of the pole piece is improved, and the service life of the pole piece is prolonged. According to some embodiments of the invention, the first active material has a greater conductive agent content than the second active material. According to a second aspect of the present invention, a pole piece manufacturing method is provided for manufacturing the pole piece, and the pole piece manufacturing method includes coating the current collector along a length direction of the current collector, intermittently discharging the first active material to coat the first active material on the first coating region, and continuously discharging the second active material to coat the second active material on the second coating region while avoiding the middle tab welding region. According to the pole piece manufacturing method provided by the embodiment of the invention, the first active material is intermittently discharged so as to avoid the middle-arranged pole lug welding area when being coated, and the middle-arranged pole lug welding area of the current collector is not covered with the active material layer, so that the welding of the pole lug and the middle-arranged pole lug welding area is facilitated, the processing techn