Unlock instant, AI-driven research and patent intelligence for your innovation.

Test method for improving hot box performance of lithium ion battery

A lithium ion battery and hot box technology, applied in the field of lithium batteries, can solve the problems of high cost, inability to meet the strict requirements of high-end customers, low pass rate of lithium ion battery hot box performance test, etc. The method is simple and the performance of the hot box is improved. , The effect of improving the performance of the hot box

Pending Publication Date: 2021-07-16
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the performance test of the lithium-ion battery hot box to solve the problem that the pass rate of the curre

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Test method for improving hot box performance of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for improving the performance test of a lithium ion battery hot box, adjusting the ratio of the negative electrode active material capacity to the positive electrode active material capacity in the lithium ion battery, recording the ratio of the negative electrode active material capacity to the positive electrode active material capacity as the CB value, the present embodiment The CB value is 1.025, and the temperature / time of the hot box performance test are 130°C / 30min, 132°C / 30min, 135°C / 30min, 138°C / 30min; the test voltage is 4.45V.

Embodiment 2

[0023] A method for improving the performance test of a lithium ion battery hot box, adjusting the ratio of the negative electrode active material capacity to the positive electrode active material capacity in the lithium ion battery, recording the ratio of the negative electrode active material capacity to the positive electrode active material capacity as the CB value, the present embodiment The CB value is 1.035, and the temperature / time of the hot box performance test are 130°C / 30min, 132°C / 30min, 135°C / 30min, 138°C / 30min; the test voltage is 4.45V.

Embodiment 3

[0025] A method for improving the performance test of a lithium ion battery hot box, adjusting the ratio of the negative electrode active material capacity to the positive electrode active material capacity in the lithium ion battery, recording the ratio of the negative electrode active material capacity to the positive electrode active material capacity as the CB value, the present embodiment The CB value is 1.045, and the temperature / time of the hot box performance test are 130°C / 30min, 132°C / 30min, 135°C / 30min, 138°C / 30min; the test voltage is 4.45V.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a test method for improving the hot box performance of a lithium ion battery. The method comprises the following steps of adjusting the ratio of the capacity of a negative electrode active material to the capacity of a positive electrode active material in the lithium ion battery, and recording the ratio of the capacity of the negative electrode active material to the capacity of the positive electrode active material as a CB value which is 1.000-1.050. Compared with the CB value of 1.055-1.2 of the traditional cell design, the method is advantaged in that the hot box performance of the battery is improved by reducing the CB value of the cell, the cell with the improved CB value can resist 138 DEG C/30 min or above in the hot box performance test, the conventional 130 DEG C/30 min hot box test can be met, and strict requirements of high-end customers can also be met. In addition, the improvement method disclosed by the invention is simple, and cost is greatly saved; and meanwhile, the hot box performance of the battery cell can be further improved on the basis of the battery cell with a relatively good hot box performance system, so extreme requirements of customers are met.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for improving the performance test of a lithium ion battery heat box. Background technique [0002] Among secondary batteries, compared with other types of secondary batteries, lithium-ion secondary batteries occupy a mainstream position in the market due to their higher energy density advantages. The lithium-ion battery mainly includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. After being wound or laminated, it is made into a battery cell, packaged and added with an electrolyte to complete the preparation of the lithium-ion battery. After the preparation is completed, it is usually required to carry out various performance tests, such as drop test, vibration test test, impact test, hot box test and so on. [0003] At present, lithium-ion batteries have more and more str...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R31/378G01R31/385G01R31/00
CPCG01R31/378G01R31/385G01R31/003
Inventor 贺江凡蔡芬敏高鹏章雄峰杨山陈杰李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD