Pole piece resistivity test method

A test method and resistivity technology, applied in the field of electrode resistivity testing, can solve the problems of large measurement error, large difference in resistivity, and large difference in contact between the upper and lower probe indenters and the pole piece, and achieve low measurement error. , The effect of solving the large measurement error

Pending Publication Date: 2021-04-20
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage is that the test method of prior art 1 has relative reference significance only when the fluctuation of the forward pressure parameter is small, but for pole pieces with different compaction states and large differences in conductivity, such as the resistance of the coating layer of the pole piece There is a large difference in the resistivity of the current collector and the pole piece. In the case of a large difference in the forward pressure parameters, the contact between the upper and lower detection pressure heads and the pole piece is quite different, resulting in a large measurement error.

Method used

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  • Pole piece resistivity test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. The polar piece with the formula of binder PVDF: conductive agent SP: lithium cobaltate at 2:2:96 is facing the glass plate (100mm×50mm) with high-strength double-sided adhesive (10mm×50mm), Use a 10kg roller to roll on the pole piece 50 times. The part of the pole piece that exceeds the double-sided adhesive tape is turned over at 180°C along the edge of the double-sided adhesive tape width direction. The current collector is separated from the coating layer to prepare the coating layer to be tested.

[0032] 2. Use an alligator clip with a bite force of 10kg (clamp width: 5mm) to clamp at 5mm positions at both ends of the length direction of the paint layer to be tested (the upper and lower metal sheets of the crocodile clip are respectively in contact with the paint layer to be tested and the glass plate), and the paint layer to be tested The length of the material is 40mm, and the width is 10mm.

[0033] 3. Connect the alligator clip to the electrochemical workst...

Embodiment 2

[0035] 1. The formula is binder PVDF: conductive agent SP: lithium cobaltate is 2:2:96 pole piece after rolling (the compaction density of the pole piece is 4.0g / cm3), and the high-strength double-sided adhesive ( 10mm×40mm) on a glass plate (100mm×40mm), use a 10kg roller to roll on the pole piece 50 times, and the part of the pole piece beyond the double-sided adhesive is folded at 180°C along the edge of the double-sided adhesive width direction, and the current collector and The coating layer is separated to prepare the coating layer to be tested.

[0036] 2. Use an alligator clip with a bite force of 10kg (clamp width: 5mm) to clamp at 5mm positions at both ends of the length direction of the paint layer to be tested (the upper and lower metal sheets of the crocodile clip are respectively in contact with the paint layer to be tested and the glass plate), and the paint layer to be tested The length of the material is 30mm, and the width is 10mm.

[0037] 3. Connect the al...

Embodiment 3

[0039] 1. The polar piece with the formula of binder PVDF: conductive agent SP: lithium cobaltate at 2:2:96 is facing the glass plate (100mm×30mm) with high-strength double-sided adhesive (10mm×30mm), Use a 10kg roller to roll on the pole piece 50 times. The part of the pole piece that exceeds the double-sided adhesive tape is turned over at 180°C along the edge of the double-sided adhesive tape width direction. The current collector is separated from the coating layer to prepare the coating layer to be tested.

[0040] 2. Use an alligator clip with a bite force of 10kg (clamp width: 5mm) to clamp at 5mm positions at both ends of the length direction of the paint layer to be tested (the upper and lower metal sheets of the crocodile clip are respectively in contact with the paint layer to be tested and the glass plate), and the paint layer to be tested The length of the material is 20mm, and the width is 10mm.

[0041] 3. Connect the alligator clip to the electrochemical workst...

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Abstract

The invention belongs to the field of lithium ion battery pole pieces, and particularly relates to a pole piece resistivity test method, which comprises the following steps of: S1, fixing a pole piece coated with slurry on an insulating plate, wherein the pole piece comprises a coating layer and a current collector, and separating the current collector on the pole piece to obtain a to-be-tested coating layer; S2, connecting the to-be-tested coating layer to an electrochemical workstation for resistivity testing; and S3, calculating the apparent resistivity of the to-be-tested coating layer; compared with the prior art, the error of measuring the resistivity of the pole piece is reduced.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery pole pieces, and in particular relates to a pole piece resistivity testing method. Background technique [0002] During the charging and discharging process of lithium-ion batteries, lithium ions and electrons are transported inside the battery pole piece. Lithium ions are transported through the electrolyte filled in the pores of the electrodes, while electrons are mainly conducted through the three-dimensional network composed of solid particles, especially conductive agents. The active material particles or the electrolyte interface participate in the electrode reaction; the conduction characteristics of the electrons have a great influence on the battery performance, mainly affecting the rate performance of the battery; and in the battery pole piece, the main factors affecting the resistivity include the bonding interface between the foil substrate and the coating layer conditions, the distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04G01N27/26G01N1/28G01R27/02
Inventor 李掌权桂亚林杨国强夏小勇
Owner 东莞维科电池有限公司
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