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Method for testing content and consumption of electrolyte in battery

A test method and electrolyte technology, applied in the direction of removing certain components such as weighing, measuring devices, instruments, etc., can solve the problem of inaccurate calculation, and achieve accurate proportion results, less solvent consumption, and accurate electrolyte content. Effect

Pending Publication Date: 2021-12-31
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that part of the electrolyte in the battery is not completely cleaned out when calculating the electrolyte content, thereby providing a more accurate calculation of the electrolyte content and consumption in the battery. Quantitative test method

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  • Method for testing content and consumption of electrolyte in battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for testing the consumption of electrolyte in a battery. The battery to be tested is a 5Ah soft-pack battery, and the electrolyte injection volume of the battery is m 1 = 17.7g, the above-mentioned battery is used for testing after 1000 cycles, and the testing process is as follows:

[0036] Put the battery in the glove box and weigh the mass of the battery as m 2 =80.92g, make a gap on the side of the battery, and put the battery gap upwards, dry the volatile components of the electrolyte in the battery electrode group in an oven at 60°C until the battery mass no longer decreases, and test at this time Battery weight m 3 = Weight m of volatile components in 73.82g electrolyte 挥发 for m 2 -m 3 = 7.10 g.

[0037] Take the separator to wrap the battery that has been baked out of volatile components, and inject m 4 =25.01g of high-purity solvent DMC, sealed and placed in a high temperature state of 60°C, and left to stand for 48 hours. Make the high-purity s...

Embodiment 2

[0045] A test method for electrolyte content in a battery, the battery to be tested is a 5Ah soft-pack battery, and the electrolyte injection volume of the battery is m 1 = 17.55g, the above-mentioned battery is directly tested by the method in Example 1 before use, the testing process is exactly the same as that of Example 1, and the testing results are shown in Table 2.

[0046] Table 2

[0047] m 挥发

[0048] From the above test results, it can be known that the electrolyte injection volume m 1 and the detected m 电解液 There is little difference in content, which further proves the accuracy of the detection result of the present invention.

Embodiment 3

[0050] In this embodiment, the method in Example 1 is used to analyze whether the capacity of the battery with a diving battery is caused by insufficient electrolyte, so as to determine whether the injection volume of the battery electrolyte meets the battery cycle life requirements. The specific process is as follows:

[0051] Step 1. Prepare the same batch of batteries, and cycle them for different weeks according to the same cycle conditions until the battery dives;

[0052] Step 2, for batteries with different cycle numbers, detect the consumption m of the electrolyte according to the method in Example 1 消耗 ;

[0053] Step 3. Obtain the number of battery cycles and the consumption of electrolyte m 消耗 The relationship diagram between, such as figure 1 shown.

[0054] pass figure 1 From the results, it can be seen that the test method for electrolyte consumption in a battery disclosed in the present invention can be used to accurately determine whether the injection volu...

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Abstract

The invention discloses a method for testing the content and consumption of an electrolyte in a battery, which comprises the following steps that the weight mvolatile of volatile components is obtained, weighing is conducted to obtain the mass m2 of the battery, the battery is broken and dried until the weight is constant, weighing is conducted to obtain the mass m3 of the battery, and mvolatile=m2-m3; a dissolving solution is obtained, the dried battery is infiltrated with a high-purity solvent with the fixed mass m4, and the salt and the non-volatile solvent in the battery are dissolved through the high-purity solvent to obtain the dissolving solution; the weight mnon-volatile of a non-volatile substance is obtained, the ratio a of the non-volatile substance to the high-purity solvent in the dissolving solution is detected through a gas chromatography, and mnon-volatile is equal to a*m4; the weight msalt of the salt is obtained, the salt concentration c1 in the dissolving solution is detected by adopting ion chromatography, wherein msalt=(1+a)m4*c1; and the content melectrolyte of the electrolyte is obtained, and melectrolyte=mvolatile+mnon-volatile+msalt. The method has the advantage that the detected and calculated electrolyte content is more accurate.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for testing electrolyte content and consumption in batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, and electric vehicle power supplies due to their advantages such as high energy density, long life, high voltage, and low discharge. The electrolyte is the carrier of ion transmission between the positive and negative electrodes of the battery. During the charge and discharge process, lithium ions are transported. The electrolyte is generally composed of non-aqueous organic solvents, lithium salts and corresponding additives. Electrolyte is an important part of lithium-ion batteries. Electrolyte has a huge impact on the battery's charge and discharge performance, rate performance, high and low temperature performance, cycle life, and calendar life. [0003] During the use of the battery, the electrolyte will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/96G01N5/04
CPCG01N30/02G01N30/96G01N5/04
Inventor 段瑞杰李树贤
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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