Electrode coating method

An electrode sheet and coating technology, which is applied in the direction of electrode collector coating, electrode manufacturing, battery electrodes, etc., can solve the problem that the amount of electrode sheet coating is difficult to control

Active Publication Date: 2017-05-24
SHENZHEN BAK POWER BATTERY CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the difference in the viscoelastic properties of different batches of lithium-ion battery slurry, it is difficult to control the coating amount of the electrode sheet

Method used

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  • Electrode coating method

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Embodiment Construction

[0018] see figure 1 , an electrode sheet coating method according to an embodiment includes the following steps S110 to S150.

[0019] Step S110: Provide the viscosity value Rv1 and elastic modulus K1 of the previous batch of lithium-ion battery slurry at the coating speed V1 and the gap value H1 of the previous batch of lithium-ion battery slurry during coating.

[0020] The coating speed V1 is a set value, which is set according to the process conditions.

[0021] The viscosity value Rv1 and elastic modulus K1 at the coating speed V1 are measured values. The viscosity value Rv1 is measured by a rheometer, and the elastic modulus K1 is measured by an optical lever method measuring device.

[0022] The gap value H1 during coating is a set value, which can be directly read by the double-roller coating equipment.

[0023] Step S120: Measure the viscosity value Rv2 of this batch of lithium-ion battery slurry at the coating speed V2.

[0024] The coating speed V2 is a set valu...

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Abstract

The invention relates to an electrode coating method. The electrode coating method comprises the following steps: the viscosity value Rv1 and the elasticity modulus K1 of lithium ion battery paste of the previous batch at the coating speed of V1 as well as the gap value H1 of the lithium ion battery paste of the previous batch during coating are provided; the viscosity value Rv2 of the lithium ion battery paste of the current batch at the coating speed of V2 is determined; the elasticity modulus K2 of the lithium ion battery paste of the current batch at the coating speed of V2 is determined; the gap value H2 of the lithium ion battery paste of the current batch during coating is determined according to the following formula: H2=(V1*H1+V1*Rv1*H1 / K1) / (V2+V2*Rv2 / K2); the gap value of two rollers of double-roller coating equipment is set to be H2, and an electrode is coated with the lithium ion battery paste of the current batch. According to the method, the difference between the viscosity and elasticity properties of the lithium ion battery paste of different batches are taken into consideration, the gap value H2 is regulated pertinently, and the coating quantity of the lithium ion battery paste can be controlled better.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for coating electrode sheets. Background technique [0002] Lithium-ion battery slurry generally includes components such as polymer fluid, positive electrode active material and conductive agent. In the actual production process, the same ratio of lithium-ion battery slurry will result in different viscoelastic properties of the final lithium-ion battery slurry due to differences in the manufacturing process. [0003] Due to the difference in the viscoelastic properties of different batches of lithium-ion battery slurry, it is difficult to control the coating amount of the electrode sheet. The coating amount of the electrode sheet is one of the most important parameters of the forming cell. If the coating amount of the electrode sheet is not well controlled during the production process, it will lead to a decline in the qualified rate of the electrode she...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139
CPCH01M4/0404H01M4/139Y02E60/10
Inventor 余学锋
Owner SHENZHEN BAK POWER BATTERY CO LTD
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