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Lithium ion battery self-discharge test method and battery assembling method

A technology of lithium ion battery and testing method, applied in the field of lithium ion battery self-discharge test and battery matching field, can solve the problems of very small change, constant voltage, judgment of battery self-discharge degree, etc., to achieve the effect of ensuring service life

Active Publication Date: 2016-04-20
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +2
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Problems solved by technology

However, although some batteries have large self-discharge, the voltage remains unchanged or changes very little for a long time, such as lithium iron phosphate / graphite, lithium iron phosphate / lithium titanate, lithium nickel manganese oxide / graphite with a relatively stable charge and discharge platform , lithium nickel manganese oxide / lithium titanate and other battery systems, so the self-discharge degree of the battery cannot be judged by its voltage

Method used

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Embodiment Construction

[0024] The invention provides a lithium ion battery self-discharge testing method, comprising the following steps:

[0025] Step S1, placing the lithium-ion battery to be tested at room temperature, and then discharging the lithium-ion battery to be tested to a preset state of charge SOC (that is, the depth of charge of the battery);

[0026] Step S2, placing the discharged lithium ion battery to be tested at a preset temperature for a preset time, and then performing pulse discharge on the lithium ion battery to be tested, and measuring the instantaneous rebound potential of the lithium ion battery to be tested after the pulse discharge is completed;

[0027] Step S3, compare the instantaneous rebound potential of the lithium-ion battery to be tested with the instantaneous rebound potential of the preset battery in the full SOC range, determine the SOC of the lithium-ion battery to be tested by the value of the instantaneous rebound potential after shelving, according to the S...

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Abstract

The invention discloses a lithium ion battery self-discharge test method and a battery assembling method. By use of the feature that the lithium ion diffusion coefficient of an electrode material in a discharge platform area is quite small, the SOCs of batteries are tested through short-time pulse discharge tests, the self-discharge rates of the batteries are calculated, such that the batteries with consistent self-discharge performance are accurately and reliably sorted, battery packs are formed by effectively pairing the batteries, the overall service life of the battery packs is guaranteed, and the test method and the assembling method have a great practical significance for detecting the self-discharge capability of a power energy storage lithium ion battery system.

Description

technical field [0001] The invention relates to a lithium-ion battery self-discharge testing method and a battery assembly method thereof. Background technique [0002] Lithium-ion batteries are currently the most widely used energy source. It has the advantages of light weight, high capacity, green environmental protection, and small self-discharge, and is widely used in mobile phones, portable digital products, electric vehicles, energy storage systems and other fields. [0003] During storage, lithium-ion batteries will self-discharge, resulting in a loss of remaining capacity. The monthly self-discharge rate of ordinary domestic lithium-ion batteries at room temperature is usually around 3% to 5%. The battery self-discharge rate is an important variable to measure battery life. Although the self-discharge rate of lithium-ion batteries is lower than that of other types of batteries, the current lithium-ion batteries are increasingly developing in the direction of multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/42
CPCG01R31/385H01M10/4207H01M10/4221Y02E60/10
Inventor 罗英冯毅吕桃林刘辉解晶莹晏莉琴张熠霄
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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