Electrode groove detection method and device

A technology of slot detection and pole piece, which is applied in the field of pole piece slotting detection method and device, can solve the problems of tab failure, current collector welding, damage to current collector, etc., and achieve the effect of reasonable depth and easy cleaning

Active Publication Date: 2022-04-15
SHENZHEN BYD LITHIUM BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The step of removing the active material is also called grooving. If the groove is too deep, the current collector will be damaged. If the groove is too shallow, the active material will not be removed, and the tabs will not be able to contact the current collector. welding

Method used

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  • Electrode groove detection method and device
  • Electrode groove detection method and device
  • Electrode groove detection method and device

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0022] The pole piece is briefly described below. As a core component of a lithium-ion battery, the pole piece includes a current collector layer and an active material layer, and the active material layer is arranged on two opposite surfaces of the current collector layer. Generally, tabs need to be welded on the pole piece to lead out the positive and negative poles. Since the tab needs to be welded to the current collector layer, it is necessary to remove the active material layer on the pole piece where the tab needs to be welded. The process of removing the active material layer is also called slotting.

[0023] Generally, during the slotting process, the active material layer will be thinned first with a laser, and after a very thin active material layer is left, the r...

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Abstract

The present application discloses a pole piece slotting detection method and device, which includes thinning the active material layers in the regions to be slotted of X pole pieces respectively, so as to form X grooves on the X pole pieces respectively; Detect the characteristics of X grooves to obtain X characteristic values; the characteristics include brightness or grayscale, and the characteristic values ​​include brightness values ​​or grayscale values; determined according to the set range value and the average value of X brightness values Strength adjustment value for thinning. Based on the characteristic value and the set range value of the groove formed after the thinning treatment of the active material layer, it is determined whether to adjust the intensity of the current thinning treatment. This can make the depth of the grooves of the subsequent pole pieces more reasonable, that is, after the pole piece is thinned, the thickness of the remaining active material layer can protect the current collector layer, and can also be easily removed by physical cleaning.

Description

technical field [0001] The technical field of the application relates to, in particular, a method and device for detecting pole piece slotting. Background technique [0002] In the manufacturing process of lithium-ion batteries, welding tabs on pole pieces is a very important step. The tab is used as a device to lead out the positive and negative electrodes of the battery cell. If the welding is not good, the finished lithium-ion battery will not be usable. [0003] Before welding the tab on the pole piece, it is generally necessary to remove the active material in the area where the tab needs to be placed on the pole piece, expose the current collector under the active material, and then weld the tab to the current collector. The step of removing the active material is also called grooving. If the groove is too deep, the current collector will be damaged. If the groove is too shallow, the active material will not be removed, and the tabs will not be able to contact the cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01B21/08
CPCG01N21/84G01B21/08
Inventor 姜新军姚芳
Owner SHENZHEN BYD LITHIUM BATTERY
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