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CN-122000270-A - Manufacturing method of battery cell pole piece, battery cell pole piece and battery cell

CN122000270ACN 122000270 ACN122000270 ACN 122000270ACN-122000270-A

Abstract

The application discloses a manufacturing method of an electrode slice, the electrode slice and an electrode core, and the manufacturing method of the electrode slice comprises the steps of providing a current collector; the method comprises the steps of coating slurry on the surface of a current collector to form a coating layer, baking the coating layer to form a first cracking layer corresponding to the coating layer, and rolling the first cracking layer to form a second cracking layer corresponding to the first cracking layer, so that the battery cell pole piece is obtained. When the electrode slice is coated, a baking process is set to enable the coating layer of the electrode slice to form a corresponding first cracking layer, and the electrode slice with the second cracking layer is obtained by roll pressing the first cracking layer. The second cracking layer improves the contact area of the electrolyte and the coating layer, reduces the diffusion path of the electrolyte in the coating layer, is beneficial to the electrolyte to infiltrate into the electrode slice of the battery through the coating layer quickly, is beneficial to the active substances to diffuse into the electrode slice of the battery quickly, and improves the electrochemical reaction rate of the battery.

Inventors

  • LOU SHUAISHUAI
  • HOU SHIJIE
  • Dong Bangyang

Assignees

  • 阳光电源股份有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (13)

  1. 1. The manufacturing method of the battery cell pole piece is characterized by comprising the following steps: Providing a current collector; Coating slurry on the surface of the current collector to form a coating layer; Baking the coating layer to form a first crack layer corresponding to the coating layer; And rolling the first cracking layer to form a second cracking layer corresponding to the first cracking layer, thereby obtaining the battery cell pole piece.
  2. 2. The method of claim 1, wherein the baking the coating layer to form a first crack layer corresponding to the coating layer comprises: adjusting the ambient temperature of the coating layer to a first preset temperature to bake the coating layer to form the first cracking layer; Adjusting the ambient temperature of the first cracking layer to a second preset temperature to cool the first cracking layer, wherein the second preset temperature is lower than the first preset temperature; adjusting the ambient temperature of the coating layer to a third preset temperature to dry the coating layer, wherein the third preset temperature is higher than the second preset temperature; And adjusting the ambient temperature of the coating layer to a fourth preset temperature so as to cool the dried coating layer, wherein the fourth preset temperature is lower than the third preset temperature.
  3. 3. The method of claim 2, wherein the first preset temperature is 105-115 ℃, the second preset temperature is 75-85 ℃, the third preset temperature is 95-105 ℃, and the fourth preset temperature is 75-85 ℃.
  4. 4. The method of manufacturing according to claim 1, wherein the rolling presses the first crack layer to form a second crack layer corresponding to the first crack layer, thereby obtaining the cell electrode sheet, comprising: and rolling the first cracking layer by adopting a thermal rolling process.
  5. 5. The method according to claim 1, wherein the second crack layer has a crack width a1 of 0.1mm < a 1≤0.5 mm.
  6. 6. The method according to claim 5, wherein the crack width of the first crack layer is a2, and a1< a2 is 1mm or less.
  7. 7. The method according to claim 1, wherein the crack depth of the second crack layer is 30% -70% of the thickness of the coating layer.
  8. 8. The method of claim 1, wherein the coating slurry is applied to the surface of the current collector to form the coating layer, comprising: coating a slurry on the upper surface of the current collector by using a first binder to form an upper surface of the coating layer, and And coating slurry on the lower surface of the current collector by adopting a second binder to form the lower surface of the coating layer, wherein the bonding strength of the second binder is higher than that of the first binder.
  9. 9. The method of claim 1, wherein applying a slurry to the surface of the current collector to form the coating layer comprises: coating a first slurry on the upper surface of the current collector to form an upper surface of the coating layer, and And coating a second slurry on the lower surface of the current collector to form the lower surface of the coating layer, wherein the particle size of the second slurry is higher than that of the first slurry.
  10. 10. An electrical core pole piece, characterized in that the electrical core pole piece comprises: a current collector; A coating layer formed on a surface of the current collector; And the second cracking layer is formed on the surface of the coating layer.
  11. 11. The battery cell sheet of claim 10, wherein the second crack layer has a gap of a1,0.1mm < a1 ∈0.5mm.
  12. 12. The battery cell sheet of claim 10, wherein the second crack layer has a depth of 30% -70% of the coating layer thickness.
  13. 13. A battery cell, characterized in that the battery cell comprises a battery cell pole piece according to any of claims 10-12.

Description

Manufacturing method of battery cell pole piece, battery cell pole piece and battery cell Technical Field The application relates to the technical field of electrode plates, in particular to a manufacturing method of an electrode plate and the electrode plate. Background The battery cell comprises a battery cell pole piece, the battery cell pole piece comprises a current collector and a coating layer on the surface of the current collector, the coating layer is an anode active substance or a cathode active substance, and the battery cell pole piece and electrolyte are subjected to electrochemical reaction to finish the storage and release of electric energy. In the related art, in order to shorten the ion diffusion path in the coating layer, the degree of wetting of the coating layer in the electrolyte is required to be increased. However, the coating layer is thicker, so that the infiltration speed and the infiltration performance of the electrolyte in the coating layer are poor, and the time and the energy consumption cost of the cell manufacturing process are increased. Disclosure of Invention The embodiment of the application provides a manufacturing method of an electrode slice, an electrode slice and an electrode. The manufacturing method of the battery cell pole piece comprises the steps of providing a current collector, coating slurry on the surface of the current collector to form a coating layer, baking the coating layer to form a first cracking layer corresponding to the coating layer, and rolling the first cracking layer to form a second cracking layer corresponding to the first cracking layer, so that the battery cell pole piece is obtained. In the method for manufacturing the battery cell pole piece provided by the embodiment of the application, when pole piece coating is carried out, a baking process is arranged to enable the coating layer of the battery cell pole piece to form a corresponding first cracking layer, and the roll press is provided with the first cracking layer so as to obtain the battery cell pole piece with a second cracking layer. The second cracking layer improves the contact area of the electrolyte and the coating layer, reduces the diffusion path of the electrolyte in the coating layer, is beneficial to the electrolyte to infiltrate into the electrode slice of the battery through the coating layer quickly, is beneficial to the active substances to diffuse into the electrode slice of the battery quickly, and improves the electrochemical reaction rate of the battery. In some embodiments, baking the coating layer to form a first crack layer corresponding to the coating layer includes adjusting an ambient temperature of the coating layer to a first preset temperature to bake the coating layer to form the first crack layer, adjusting the ambient temperature of the first crack layer to a second preset temperature to cool the first crack layer, the second preset temperature being lower than the first preset temperature, adjusting the ambient temperature of the coating layer to a third preset temperature to bake the coating layer, the third preset temperature being higher than the second preset temperature, and adjusting the ambient temperature of the coating layer to a fourth preset temperature to cool the dried coating layer, the fourth preset temperature being lower than the third preset temperature. In the manufacturing method of the battery cell pole piece provided by the embodiment of the application, in the process of baking the coating layer, the coating layer is required to be dried to remove the solvent to form a solid coating layer, and a first cracking layer is required to be formed on the surface of the coating layer. When the coating layer contains moisture, the first cracking layer is easier to form due to inconsistent volumes corresponding to the liquid material and the solid material. And when the coating layer is solid, the first crack layer is not easily formed. Therefore, the first crack layer may be formed on the surface of the coating layer, and then the water of the coating layer may be removed. The ambient temperature of the coating layer may be generally set to "high temperature-low temperature-high temperature-low temperature". In some embodiments, the first preset temperature is 105-115 ℃, the second preset temperature is 75-85 ℃, the third preset temperature is 95-105 ℃, and the fourth preset temperature is 75-85 ℃. In some embodiments, rolling the first crack layer to form a second crack layer corresponding to the first crack layer to obtain the cell pole piece includes rolling the first crack layer using a thermal rolling process. In the thermal roll pressing process, the setting of the crack width of the second crack layer according to the requirement is facilitated by setting the temperature. In some embodiments, the second crack layer has a crack width of a1,0.1mm < a1 ∈0.5mm. If the crack width of the second crack layer is too small, the electroly