Method for evaluating crushing strength of powder particles

A technology of crushing strength and powder particles, which is applied in the field of battery material characteristic detection, can solve the problems of high cost and complicated operation, and achieve the effect of low cost, simple process and reduced R&D cost

Pending Publication Date: 2022-03-04
元能科技(厦门)有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0003] In the prior art, the evaluation method for the crushing strength of the cell material particles is to compress the powder of the cell material particles and then use a scanning electron microscope to analyze whether the powder is broken. This method is costly and complicated to operate.

Method used

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  • Method for evaluating crushing strength of powder particles

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Embodiment Construction

[0016] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples.

[0017] The invention is a method for evaluating the crushing strength of powder particles. After the powder sample of the cell material particles is vibrated, the powder sample is subjected to a continuous pressurization-depressurization cycle compression experiment, and the thickness of the powder sample is measured when different pressures are applied. Rebound value, draw the pressure-thickness rebound value relationship curve of the powder sample, and take the highest point of the curve as the critical point of pressure for the powder sample to break.

[0018] The present invention uses compaction density meter and powder resistance meter during concrete implementation, comprises the following steps:

[0019] Step 1. Take the powder sample of the cell material particles and pour it into the jig (laying thick...

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Abstract

The invention discloses a method for evaluating the crushing strength of powder particles, which comprises the following steps of: compacting a powder sample of battery cell material particles, performing a continuous pressurization-pressure relief cyclic compression experiment on the powder sample, measuring thickness rebound values of the powder sample when different pressures are applied, drawing a pressure-thickness rebound value relation curve of the powder sample, and calculating the crushing strength of the powder particles according to the pressure-thickness rebound value relation curve. And taking the highest point of the curve as a pressure critical point for crushing the powder sample. According to the method, a pressurization-pressure relief circulation experiment is carried out on a powder sample of battery cell material particles at increasing pressure, the pressure intensity applied each time and the thickness of the powder sample are recorded, a pressure intensity-thickness rebound value relation curve is calculated and drawn, and the pressure intensity critical point of crushing of the powder sample can be judged through the highest point of the curve, so that the crushing accuracy of the powder sample is improved. Therefore, the maximum bearing pressure of the powder is known, and the hardness performance of the material is represented.

Description

technical field [0001] The invention relates to the technical field of battery material characteristic detection, in particular to a method for evaluating the crushing strength of powder particles. Background technique [0002] During the charge and discharge process of lithium-ion batteries, as lithium ions are intercalated and extracted from the negative electrode, the cells will expand and contract. Excessive expansion will cause the shattering of the cell material particles, seriously affecting the performance of the cell. Therefore, it is of great significance to accurately and effectively evaluate the mechanical properties of battery material particles to maintain the reliability and consistency of battery quality. [0003] In the prior art, the evaluation method for the crushing strength of the cell material particles is to compress the powder of the cell material particles and then use a scanning electron microscope to analyze whether the powder is broken. This meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N9/00G01N27/04
CPCG01N3/32G01N9/00G01N27/043
Inventor 齐琼琼魏丽英杨凡王益李希龙
Owner 元能科技(厦门)有限公司
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