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

Lithium ion battery pack consistency discrimination method and system

A lithium-ion battery pack and lithium-ion battery technology, which is applied in secondary batteries, secondary battery testing, secondary battery charging/discharging, etc., can solve problems such as deviation and low accuracy

Active Publication Date: 2018-09-14
SUZHOU GCLSI SCI & TECH IND APPL RES INST CO LTD +2
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many factors that affect the performance of lithium-ion batteries, and the single method of judging the consistency by considering the charge and discharge capacity has large deviations and low accuracy.

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
  • Lithium ion battery pack consistency discrimination method and system
  • Lithium ion battery pack consistency discrimination method and system
  • Lithium ion battery pack consistency discrimination method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] refer to figure 1 , a method for discriminating consistency of a lithium-ion battery pack in an embodiment includes the following steps.

[0029] S110: Perform a discharge capacity test on each lithium ion battery in the lithium ion battery pack, and obtain the actual discharge capacity of each lithium ion battery as a first array.

[0030] Lithium-ion battery is a kind of rechargeable battery, including lithium iron phosphate battery, ternary lithium-ion battery, etc.; lithium-ion battery pack is obtained by combining multiple lithium-ion batteries in series or in parallel. Battery capacity is one of the important performance indicators of battery performance. The actual discharge capacity of a lithium-ion battery refers to the amount of electricity discharged under certain conditions (discharge rate, temperature, end-of-discharge voltage, etc.). The discharge capacity test for a lithium-ion battery can be specifically Each lithium-ion battery is discharged under pres...

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 relates to a lithium ion battery pack consistency discrimination method and system. The method comprises steps that through the discharge capacity test, the electrochemical AC impedancespectroscopy test and the DC discharge internal resistance test of each lithium ion battery in the lithium ion battery pack, a first array formed by the actual discharge capacity of each lithium ion battery, a second array formed by the time constant of each lithium ion battery and a third array formed by the DC discharge internal resistance of each lithium ion battery are respectively acquired; difference analysis of the lithium ion battery pack is carried out according to the first array, the second array and the third array to acquire a difference value of each lithium ion battery respectively corresponding to the first array, the second array and the third array; a non-uniform lithium ion battery is determined from the lithium ion battery pack based on the difference values. The methodis advantaged in that difference is analyzed through three types of data including the actual discharge capacity, the time constant and the DC discharge internal resistance, multiple types of factorsare integrated to consider consistency of performance among the lithium ion batteries in the lithium ion battery pack, and discrimination accuracy is high.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and system for judging the consistency of lithium-ion battery packs. Background technique [0002] Lithium-ion batteries are currently the most widely used secondary batteries. Multiple lithium-ion batteries are connected in series or in parallel to form a lithium-ion battery pack, which can be used as an energy storage device for electric vehicles. The performance consistency of each lithium-ion battery in a lithium-ion battery pack will affect the comprehensive energy utilization efficiency of the entire lithium-ion battery pack. Therefore, with the rapid development of electric vehicles and energy storage systems, the performance of lithium-ion battery packs Consistency requirements are getting higher and higher. [0003] The traditional method for judging the consistency of lithium-ion battery packs is generally to conduct a simple charge and discharge capacity te...

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): G01R31/36H01M10/42H01M10/44H01M10/48
CPCH01M10/4285H01M10/441H01M10/482Y02E60/10
Inventor 王文杰陈德荣
Owner SUZHOU GCLSI SCI & TECH IND APPL RES INST CO LTD