Method for evaluating self-discharge of lithium ion battery

A technology of lithium ion battery and evaluation method, applied in the field of lithium ion power battery, can solve the problems of accelerating the dissolution of metal elements and shortening the evaluation period, etc.

Inactive Publication Date: 2018-07-17
EVE ENERGY CO LTD
View PDF12 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for evaluating the self-discharge of lithium-ion batteries. By cycling and storing at high temperature, the dissolution process of metal elements in lithium-ion batteries is accelerated, and the lithium-ion batteries are evaluated by comparing the vol...

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
  • Method for evaluating self-discharge of lithium ion battery
  • Method for evaluating self-discharge of lithium ion battery
  • Method for evaluating self-discharge of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 It is a schematic flow chart of a method for evaluating self-discharge of a lithium-ion battery provided in the first embodiment of the present invention. The method for evaluating the self-discharge of lithium-ion batteries in the embodiments of the present invention can be applied to scenarios where it is necessary to quickly identify the influence of metal elements in new materials on the self-discharge performance of lithium-ion batteries. The new materials may include main materials, current collectors, and conductive materials. Exemplary main materials may include lithium nickel cobalt manganese oxide, lithium cobalt oxide, graphite, silicon carbon and silicon oxygen; exemplary current collectors may include copper foil and aluminum foil; exemplary conductive agents may include superconducting graphite, Carbon black, acetylene black and graphene. The identifiable metal elements may include metal elements such as iron, copper, zinc, manganese, titanium, alu...

Embodiment 2

[0067] figure 2 It is a schematic flow chart of a method for evaluating self-discharge of a lithium ion battery provided by the second embodiment of the present invention, see figure 2 , On the basis of the first embodiment, the method includes:

[0068] S210: Charge the lithium-ion battery to a first state of charge, and control the lithium-ion battery to cycle charging and discharging for a first preset time at a first preset temperature.

[0069] S220. Charge the lithium ion battery to a second state of charge at a second preset temperature, and store the lithium ion battery at a third preset temperature, and obtain the unit time of the lithium ion battery during the storage process The first pressure drop changes within.

[0070] S230. Repeat the cycle and storage operations at least once, and obtain a second voltage drop change of the lithium ion battery per unit time during each repetition.

[0071] Wherein, the first preset temperature is greater than the second preset temper...

Embodiment 3

[0083] image 3 It is a schematic flow chart of a method for evaluating self-discharge of a lithium ion battery provided by the third embodiment of the present invention, see image 3 , On the basis of the first embodiment, the method includes:

[0084] S310. Charge the lithium-ion battery to a first state of charge, and control the lithium-ion battery to cycle charging and discharging for a first preset time at a first preset temperature.

[0085] S320. At the second preset temperature, charge the lithium ion battery to a second state of charge, and store the lithium ion battery at a third preset temperature. When the storage process starts, obtain the lithium ion battery The first open circuit voltage value.

[0086] S330. Place the lithium ion battery at a third preset temperature and store it for a second preset time, and when the storage process ends, obtain a second open circuit voltage value of the lithium ion battery.

[0087] Optionally, the second preset time may be 1 day to...

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 discloses a method for evaluating the self-discharge of a lithium ion battery. The method includes: charging the lithium ion battery to a first state of charge, and circularly charging and discharging the lithium ion battery for first preset time at a first preset temperature; charging the lithium ion battery to a second preset state of charge at a second preset temperature, storingthe lithium ion battery at a third preset temperature, and obtaining the first voltage drop change of the lithium ion battery per unit time during the storage process; repeatedly executing the circulation and the storage operations at least once, and obtaining a second voltage drop change of the lithium ion battery per unit time during each repetitive process; comparing the first voltage drop change and the second voltage drop change, evaluating the self-discharge performance of the lithium ion battery, wherein the first preset temperature is greater than the second preset temperature, and thethird preset temperature is greater than the second preset temperature. According to the technical solution of the present invention, the metal elements in the lithium ion battery are dissolved out by the circular storage at the high temperature, and the evaluation period of the influence of the metal elements on the performance of the battery is shortened.

Description

Technical field [0001] The embodiments of the present invention relate to the technical field of lithium-ion power batteries, and in particular to a method for evaluating self-discharge of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in electronic equipment and energy fields due to their advantages of high voltage, high energy density, small size, large capacity and long cycle life. This year, with the rapid development of the new energy automobile industry, the safety and consistency of lithium-ion batteries need to be further improved. In the energy storage system and tool market of electric vehicles, a single lithium-ion battery is connected in series or parallel to form a lithium-ion battery pack. Each lithium-ion battery in the lithium-ion battery pack must ensure good self-discharge consistency to ensure charging or There will be no overcharging during storage. [0003] Generally, methods for evaluating the self-discharge of lit...

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): G01R31/36
CPCG01R31/3648G01R31/378G01R31/385
Inventor 牛雁黄河徐悦斌何巍刘金成
Owner EVE ENERGY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap