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Battery pole piece testing method and die for preparing battery pole piece

A battery pole piece and testing method technology, which is applied in the field of failure analysis research of lithium-ion batteries, can solve problems such as current collector damage, dressing residue, consistency, and repetitive battery pole piece capacity value difficulties, and achieve a simple test method Effect

Active Publication Date: 2018-09-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] After the commercial battery is disassembled, the conventional single-sided electrode treatment method is to wipe the double-sided electrode with N-methylpyrrolidone. Since the wiping process is likely to cause damage to the current collector or residual dressing on the wiped surface, the wiping operation takes a long time. Wiping The area where the operation is easy to complete is limited to the central area of ​​the entire pole piece, and it is difficult to simply obtain the capacity value of the current state of the battery pole piece after disassembly with good consistency and repeatability

Method used

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  • Battery pole piece testing method and die for preparing battery pole piece
  • Battery pole piece testing method and die for preparing battery pole piece
  • Battery pole piece testing method and die for preparing battery pole piece

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Embodiment 1

[0051] The fully charged state (LiNi 0.6 co 0.2 mn 0.2 o 2 +LiMn 2 o 4 ) / graphite pouch battery for disassembly. The disassembled double-sided positive and negative electrodes were cut into circular pole pieces with a diameter of 16 mm. The disassembled single-sided positive and negative electrodes were cut into circular pole pieces with a diameter of 14 mm. Cut the copper glue and aluminum glue into a circular size with a diameter of 14mm. Put a circular pole piece with a diameter of 16mm into a cylindrical mold. The schematic diagram of the mold is as follows figure 2 As shown, make the center of the circular pole piece coincide with the center of the mold. Clamp the upper and lower ends of the mold, use tweezers to scrape off the pole piece dressing on the ring with an outer diameter of 16mm and an inner diameter of 14mm in the circular pole piece with a diameter of 16mm, and obtain a pole piece with a shape similar to a "beer bottle cap" with a center diameter of ...

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Abstract

The invention provides a battery pole piece testing method and a die for preparing a battery pole piece, and belongs to the field of failure analysis research of lithium ion batteries. A battery is disassembled, pre-treatment is carried out on a double-side battery pole piece, and capacity and impedance testing results of the double-side pole piece after treatment are basically the same with thoseof a single-side pole piece in the disassembled battery. The double-side battery pole piece after disassembling of the battery is sliced directly, rubberizing is carried out after that the pole pieceis processed by the die, single-side treatment is completed for the double-side pole piece, the pole piece is assembled into a button cell form, a charging-discharging curve of a half cell and electromechanical impedance spectra of a full cell and a symmetric cell are measured, and the testing method is simple and accurate.

Description

technical field [0001] The invention relates to the research field of failure analysis of lithium ion batteries, in particular to a battery pole piece testing method and a mold for preparing battery pole pieces. Background technique [0002] As one of the most widely used and largest chemical energy storage technologies, lithium-ion batteries can accurately obtain the main cause of battery failure through failure analysis, which is conducive to preventing safety accidents during battery use and prolonging battery life. Improve the reliability of the battery, and at the same time feed back information to optimize the improvement plan in the process of battery production and preparation. [0003] Capacity fading is a common manifestation of battery failure. The commonly used failure analysis method after battery disassembly is electrochemical measurement method, including half-cell charge and discharge test, and electrochemical impedance spectroscopy test of full battery and s...

Claims

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Application Information

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IPC IPC(8): G01R31/36H01M4/04
CPCH01M4/04Y02E60/10
Inventor 周格王其钰王朔郑杰允禹习谦李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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