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Method for evaluating high-temperature aging time of lithium ion battery

A lithium-ion battery, high-temperature aging technology, applied in the field of lithium-ion batteries, can solve the problems of no high-temperature aging time evaluation method, poor battery performance, and electric vehicle fire.

Active Publication Date: 2022-08-05
楚能新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]At present, the high-temperature aging time adopted by various power battery enterprises is between 0-48h. If the aging time is too short, the aging effect will not be achieved, resulting in poor performance of the battery. Self-discharging defective batteries containing metal particles will flow into the market and cause electric vehicle fire problems; if the aging time at high temperature is too long, the battery production cycle will be prolonged, which is not conducive to reducing the battery life. manufacturing cost

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  • Method for evaluating high-temperature aging time of lithium ion battery
  • Method for evaluating high-temperature aging time of lithium ion battery

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Embodiment Construction

[0032] The following specific examples will further illustrate the present invention in detail.

[0033] A method for evaluating the high temperature aging time of a lithium ion battery provided by the present invention includes the following steps:

[0034] 1) Preparation of Fe and Cu metal particles

[0035] Add Fe and Cu particles with a particle size of 80-100 μm into a vial filled with absolute ethanol, respectively, and the volume ratio of Fe and Cu metal particles to absolute ethanol is 1:100 (the volume of metal particles is calculated by stacking volume) to obtain Fe / alcohol mixture, Cu / alcohol mixture;

[0036] 2) Cell production

[0037] Take 4N bare cells of the same type that have just been wound as a group. In this embodiment, N=4, and N cells are taken from each group of bare cells to implant Fe particles, that is, shake the vial of Fe / alcohol mixture to make the The particles are evenly dispersed in the alcohol, and a drop of Fe / alcohol mixture is drawn with...

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Abstract

The invention discloses a lithium ion battery high-temperature aging time evaluation method which comprises the following steps: 1) respectively adding Fe and Cu particles into absolute ethyl alcohol to obtain a Fe / alcohol mixture and a Cu / alcohol mixture; 2) taking a plurality of naked battery cells as a group, dividing each group of naked battery cells into three parts, performing Fe particle implantation on one part of naked battery cells, performing Cu particle implantation on the other part of naked battery cells, and performing no metal particle implantation on the rest part of naked battery cells; 3) taking the four groups of naked battery cells obtained in the same step 2), producing according to a process with different high-temperature aging time to obtain finished battery cells, and carrying out OCV test on the finished battery cells after capacity grading; and 4) processing and analyzing test data to obtain target high-temperature aging time T. According to the method, the Fe and Cu metal particles are implanted into the battery cell, so that the self-discharge screening rates of the metal implanted battery cell at different high-temperature aging times are compared, and the optimal high-temperature aging time is quickly and accurately obtained.

Description

technical field [0001] The present invention relates to lithium ion batteries, in particular to a method for evaluating high temperature aging time of lithium ion batteries. Background technique [0002] Lithium-ion batteries have many advantages such as high voltage, high specific capacity, environmental friendliness, and many cycles. They have been widely used in mobile phones, digital cameras, notebook computers, electric vehicles and other fields. [0003] There is an aging process in the lithium-ion battery manufacturing process. Aging is divided into normal temperature aging and high temperature aging. The purpose of aging is to stabilize the properties and composition of the SEI film formed after initial charging, while high temperature aging is mainly to shorten the aging time. Thus, the production efficiency is improved, and the high temperature aging can fully expose the bad phenomena of the battery. [0004] At present, the high-temperature aging time adopted by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/392G01R31/378
CPCG01R31/3865G01R31/392G01R31/378Y02P70/50Y02E60/10
Inventor 钟祥龙矫贺东
Owner 楚能新能源股份有限公司
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