Method for quantitatively detecting electrolyte distribution in battery

A quantitative detection, electrolyte technology, applied in the direction of measurement device, material separation, analysis of materials, etc., can solve the problems affecting the stability of electrolyte composition and high cost, and achieve the effect of simple test method, low cost, and optimized liquid injection volume.

Active Publication Date: 2021-08-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The main purpose of the present invention is to provide a method for quantitatively detecting the distribution of electrolyte inside the battery, so as to solve the problems of high cost and influence on the composition of electrolyte in existing testing methods stability problem

Method used

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  • Method for quantitatively detecting electrolyte distribution in battery
  • Method for quantitatively detecting electrolyte distribution in battery
  • Method for quantitatively detecting electrolyte distribution in battery

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The specific operation steps for quantitatively detecting the electrolyte distribution inside the battery cell are as follows:

[0053] (1) The electrolyte in the target battery is lithium salt and LiPF 6 , 14.6wt%, the organic solvent is a mixture of ethylene carbonate and dimethyl carbonate, and the weight ratio is 3:7.

[0054] The above target battery was aged at a high temperature of 45° C. for 5 hours, and then the first dismantling treatment was performed to obtain a battery electrode assembly. The above-mentioned first dismantling process includes cutting the metal shell and aluminum-plastic film outside the battery cell, removing the metal shell and aluminum-plastic film outside the battery cell, and obtaining the battery electrode group.

[0055] (2) Take out the above-mentioned battery electrode group and place it horizontally in the glove box; let the above-mentioned battery electrode group stand still in an environment with an external dew point of -40°C, ...

Embodiment 2

[0064] The difference from Example 1 is: the distribution of the electrolyte of the battery aged at 45°C for 10 hours after liquid injection is shown in Figure 5 .

Embodiment 3

[0066] The difference from Example 1 is: the distribution of the electrolyte of the battery aged at 45°C for 15 hours after liquid injection is shown in Figure 6 .

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Abstract

The invention provides a method for quantitatively detecting electrolyte distribution in a battery. The method comprises the following steps: taking an organic solution of lithium salt LiPF6 as an electrolyte, and disassembling a target battery to obtain a plurality of pole pieces; sampling from each pole piece to obtain a plurality of groups of samples to be tested; and measuring the content of PF6<-> in each samples to be tested, and calculating the content of the electrolyte at the corresponding position of each samples to be tested, so as to obtain the distribution data of the electrolyte in the target battery. The test method is simple and low in cost, and no extra components are added, so that the method does not influence the electrolyte. The detection method plays a theoretical support for optimizing the liquid injection process in the battery production process, and also provides data support for the electrolyte consumption rate at different positions in the battery circulation process, optimization of the liquid injection amount, prediction of the service life of the battery and the like.

Description

technical field [0001] The invention relates to the field of lithium battery manufacturing, in particular to a method for quantitatively detecting the distribution of electrolyte inside the battery. Background technique [0002] The uniform distribution of the electrolyte in the lithium-ion battery is the key point to ensure the consistency and cycle performance of the battery. More electrolyte content will increase the rate of side reactions at this position, while less electrolyte content will lead to lithium-ion power at this position. Lithium intercalation is difficult during the charging process, and there is a great risk of lithium analysis. The uniform distribution of the electrolyte in the lithium-ion battery is beneficial to prolong the cycle life of the lithium-ion battery, reduce the risk of lithium analysis, and improve the safety of use. [0003] At present, the detection methods for the electrolyte distribution inside the lithium-ion battery include: [0004]...

Claims

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Application Information

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IPC IPC(8): G01N30/96G01N30/64
CPCG01N30/96G01N30/64G01N2030/645G01N2030/965Y02E60/10
Inventor 李树贤杜建平张要军刘子琪于奥段瑞杰杨红新高飞骆兆军
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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