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Method for testing solid content of lithium ion secondary battery slurry

A test method and secondary battery technology, applied in the field of lithium ion batteries, can solve problems such as large calculation errors, and achieve the effects of high test accuracy, convenient use and improved test efficiency

Pending Publication Date: 2021-06-18
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to provide a method for testing the solid content of lithium-ion secondary battery slurry with less error, the present invention explores a method for improving the accuracy of solid content testing, so as to solve the problem of large calculation errors in the actual application process

Method used

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  • Method for testing solid content of lithium ion secondary battery slurry

Examples

Experimental program
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Embodiment 1

[0029] This embodiment provides a method for testing the solid content of lithium-ion secondary battery slurry, comprising the following steps:

[0030] (1) Cut a square piece of foil (the side length is 70mm), weigh it on a balance with an accuracy of one ten-thousandth, and record the weight in m 1 ;

[0031] (2) Place the foil on the operating table, coat the positive electrode lithium iron phosphate slurry to be tested on the surface of the foil, weigh it on a balance with an accuracy of one ten-thousandth, and record the weight as m 2 ;

[0032] (3) Place the foil with slurry on the induction cooker, turn on the induction cooker for heating, first heat at 1000W for 1.5min, then at 1600W for 2min, and finally at 1200W for 0.5min; after the heating is completed, Weigh on a balance with an accuracy of one ten-thousandth, and record the weight as m 3 ;

[0033] (4) Calculate the solid content of the slurry: (m 3 -m 1 ) / (m 2 -m 1 )*100%.

Embodiment 2

[0035] This embodiment provides a method for testing the solid content of lithium-ion secondary battery slurry, comprising the following steps:

[0036] (1) Cut a square piece of foil (the side length is 70mm), weigh it on a balance with an accuracy of one ten-thousandth, and record the weight in m 1 ;

[0037] (2) Place the foil on the operating table, coat the positive electrode ternary material slurry to be tested on the surface of the foil, weigh it on a balance with an accuracy of one ten-thousandth, and record the weight as m 2 ;

[0038] (3) Place the foil with the slurry on the induction cooker, turn on the induction cooker for heating, first heat at 800W for 1min, then at 1800W for 2min, and finally at 1300W for 0.5min; Weigh on a balance with an accuracy of one ten-thousandth, and record the weight in m 3 ;

[0039] (4) Calculate the solid content of the slurry: (m 3 -m 1 ) / (m 2 -m 1 )*100%.

Embodiment 3

[0041] This embodiment provides a method for testing the solid content of lithium-ion secondary battery slurry, comprising the following steps:

[0042] (1) Cut a square piece of foil (the side length is 90mm), weigh it on a balance scale with an accuracy of one ten-thousandth, and record the weight as m 1 ;

[0043] (2) Place the foil on the operating table, coat the negative electrode water-based graphite slurry on the surface of the foil, weigh it on a balance with an accuracy of 1 / 10,000, and record the weight as m 2 ;

[0044] (3) Place the foil with the slurry on the induction cooker, turn on the induction cooker for heating, first heat at 1200W for 2 minutes, then at 2000W for 2 minutes, and finally at 1600W for 0.5min; Weigh on a balance with an accuracy of one ten-thousandth, and record the weight in m 3 ;

[0045] (4) Calculate the solid content of the slurry: (m 3 -m 1 ) / (m 2 -m 1 )*100%.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a method for testing the solid content of lithium ion secondary battery slurry. The testing method comprises the following steps of coating the surface of a foil with slurry to be tested, flatly placing the material on an induction cooker, and heating at 800-2000 W for 3-5 minutes. According to the testing method disclosed by the invention, the solid content of the slurry can be rapidly measured within 3-5 minutes, so that the testing efficiency is greatly improved; the testing precision is high, and no powder flies in the whole process; and the testing method is simple and convenient to use.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for testing the solid content of slurry for lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries are widely used in notebooks, mobile phones, Bluetooth headsets, smart watches, electric vehicles and other fields. In the manufacturing process of lithium-ion secondary batteries, the first step is the preparation of ingredients and slurry. In order to prevent batch failure caused by the wrong addition of various materials, the solid content of the slurry is tested after the slurry is prepared; for this item Test items, the routine test method is: first take a piece of foil material to weigh and peel, then apply 2-5g of slurry evenly on the foil material, and then put it in a blast oven for 1-2 hours at 120-150°C Baking, weighing after baking to calculate the solid content. However, the numerical error of the solid co...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 王元杰薄晋科宫颂
Owner DALIAN CBAK POWER BATTERY CO LTD
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