Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Self-discharge test method for lithium ion battery

A lithium-ion battery and testing method technology, which is applied in the field of self-discharge testing of lithium-ion batteries, can solve problems such as long medium-discharge time and complicated procedures, and achieve accurate self-discharge conditions and ensure accuracy.

Inactive Publication Date: 2017-12-01
CALB CO LTD
View PDF10 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the discharge time of the above-mentioned invention patent is long and the process is complicated

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
  • Self-discharge test method for lithium ion battery
  • Self-discharge test method for lithium ion battery
  • Self-discharge test method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] Step S1: Randomly select 5 formed batteries with a rated capacity of 72Ah. First cycle the battery for 8 times. After the cycle is completed, adjust the battery to constant capacity. The cycle conditions are: in the constant capacity workshop (25±2°C) Under normal conditions, the charge-discharge cycle is carried out with a current of 1C; after the cycled battery is left to stand for 3 hours, the volume is constant. Discharge 0.5C to 2.5V, and then use 0.1C to discharge completely, that is to complete the constant volume.

[0033] Step S2: Charge the battery with a constant current of 0.5C to a fully charged state, then transfer the battery to a high-temperature room at 45°C, and store it for 7 days.

[0034] Step S3: Transfer the static battery to the constant volume room. After static for 8 hours, discharge the battery, then fully charge it, and constant volume. Refer to the second step for discharge conditions and constant volume conditions.

[0035] Table 1. Batter...

Embodiment approach 2

[0039] Step S1: Randomly select 5 formed batteries with a rated capacity of 72Ah. First cycle the battery 5 times. After the cycle is completed, constant the capacity of the battery. The cycle conditions are: in the constant capacity workshop (25±2°C) Under normal conditions, the charge-discharge cycle is carried out with a current of 1C; after the cycled battery is left to stand for 3 hours, the volume is constant. Discharge 0.5C to 2.5V, and then use 0.1C to discharge completely, that is to complete the constant volume.

[0040] Step S2: Charge the battery with a constant current of 0.1C to a fully charged state, then transfer the battery to a high temperature room at 45°C, and store it for 10 days.

[0041] Step S3: Transfer the static battery to the constant volume room. After static for 8 hours, discharge the battery, then fully charge it, and constant volume. Refer to the second step for discharge conditions and constant volume conditions.

[0042] Table 2. Battery self...

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 the technical field of lithium battery test, and particularly relates to a self-discharge test method for a lithium ion battery. The method comprises the following steps of S1, carrying out several times of charge and discharge circulation on a lithium-ion battery, and carrying out the volume metering test on the lithium-ion battery; S2, charging the lithium-ion battery which has been already subjected to charging and discharging pretreatment to a full-electricity state, and standing the lithium-ion battery at a high-temperature environment of 35-50 DEG C for 1-10 days; S3, cooling the lithium-ion battery after the standing treatment, metering the volume of the lithium-ion battery again, and determining the self-discharge condition of the lithium-ion battery according to two volume metering results. By adopting the above method, the temperature of 35-50 DEG C is adopted as a high-temperature standing temperature based on the results of a large number of experimental tests. Therefore, the performance of the lithium-ion battery can be optimized, and the experiment testing time can be greatly shortened.

Description

technical field [0001] The invention relates to the technical field of lithium battery testing, in particular to a lithium ion battery self-discharge testing method. Background technique [0002] With the development of the electric vehicle industry, since lithium iron phosphate batteries have better safety performance and longer life than other lithium-ion batteries, it has become a trend for lithium iron phosphate batteries to be used in electric vehicles. [0003] When the storage battery and primary battery are not connected to the external circuit, the loss of battery capacity caused by the internal white hair reaction is generally called self-discharge. Expressed by the percentage of capacity lost per year or per month, for example, the self-discharge of various lithium-ion batteries is very small, 1-2% per month, and the metal hydride is relatively large, reaching more than 10% per month. Due to the uncertainty of the production process and the uncontrollability of v...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/378G01R31/392G01R31/396
Inventor 王云辉樊彦良孙青山王红领李景凯
Owner CALB CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com