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Lithium ion battery self-discharge screening and matching method

A lithium-ion battery and self-discharge technology, applied in the field of lithium-ion, can solve the problems of harshness, irreversibility, capacity attenuation of lithium-ion batteries, etc., and achieve the effect of ensuring product quality requirements, convenient operation, and improving cycle performance and safety performance.

Inactive Publication Date: 2020-04-24
安徽益佳通电池有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

Because the lithium-ion battery is left in the state of constant current and constant voltage full charge, the voltage difference fluctuates greatly, and the charging method of the lithium-ion battery system cannot perfectly realize the constant current and constant voltage mode, resulting in the large dynamic pressure difference of the battery screened by this method , the difference of the battery system is constantly enlarged and bad during the use process, which cannot meet the needs of users
Moreover, the fully charged lithium-ion battery has a large self-discharge during storage, and the battery capacity decays quickly and cannot be recovered; the fully charged lithium-ion battery has a slight short circuit or a complete short circuit safety accident caused by misoperation during the assembly process.
[0004] Aiming at the deficiencies of the existing technology, we propose a method of lithium-ion self-discharge screening and grouping to solve the problem of rapid capacity decay and time-consuming problems of lithium-ion batteries in stock due to the large pressure difference during the use of lithium-ion batteries and the lack of grouping for the time being. security incidents etc.

Method used

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  • Lithium ion battery self-discharge screening and matching method

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Embodiment Construction

[0021] In order to make the implementation technical means, creative features, objectives and effects of the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific illustrations.

[0022] like figure 1 As shown, the present invention provides a method for self-discharging screening and grouping of lithium-ion batteries, charging the batteries after capacity division to the preset state of charge, and selecting alternative batteries whose battery voltage is within the set range, including the following step:

[0023] Step 1: Lithium-ion battery is charged and discharged;

[0024] Step 2: Classify the capacity of the batteries sorted out in Step 1 according to a fluctuation tolerance of 1%;

[0025] Step 3: Test the batteries classified in the above steps separately, and charge them with a constant current of less than 0.2C to a capacity of 5%-20%;

[0026] Step 4: Shelve for 4-8 hours at a temperature of 25°C...

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Abstract

The invention provides a lithium ion battery self-discharge screening and matching method. The method comprises the steps of charging a capacity-graded battery to a preset state of charge, and selecting alternative batteries of which the battery voltage is within a set range; According to the method, the battery is capacity-graded; the battery with the first-grade capacity is tested, meanwhile, the subsequent voltage difference and the numerical value of the DC internal resistance DCIR are analyzed, so as to guarantee that the difference among the capacity, the self-discharge voltage and the internal resistance of the assembled battery is small; the problems of large voltage difference, rapid capacity attenuation and the like in the using process of the lithium ion battery due to mismatching of the assembled battery are solved; high-temperature shelving of the battery is beneficial to infiltration of the electrolyte of the lithium ion battery, and micro short-circuit points in the battery can be aggravated due to the high-temperature expansion effect, so that later-period self-discharge screening is facilitated; the method is convenient to operate; the cycle performance and safetyperformance of the battery pack are improved; the method is suitable for batch production; the product quality requirement is met; and a basis is provided for single battery process inspection.

Description

technical field [0001] The invention relates to the field of lithium ion technology, in particular to a method for self-discharge screening and grouping of lithium ion batteries. Background technique [0002] As the heart of new energy electric vehicles, ships, industrial vehicles, and base station energy storage, lithium-ion batteries have the advantages of long cycle life, high specific energy, fast charge and discharge, wide operating temperature range, strong adaptability, and environmental protection. It is highly valued by the country and various industries, and is a strategic direction firmly supported by the country; lithium-ion batteries are composed of battery modules and battery systems in series and parallel. In order to ensure the stable operation of the lithium-ion battery system, it is particularly important for the screening and matching of lithium-ion batteries to be consistent. [0003] Lithium-ion battery self-discharge refers to the capacity loss caused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/44Y02E60/10
Inventor 苏小柳周德清王永军张前兵邱峰
Owner 安徽益佳通电池有限公司
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