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Aging method of lithium ion battery

A lithium-ion battery and voltage technology, applied in the field of aging process of lithium-ion batteries, can solve the problems of difficulty in picking out low-voltage batteries, prolonging the aging cycle, increasing time, labor, and logistics costs, so as to shorten the aging time and prevent inflow. market effect

Inactive Publication Date: 2013-09-25
SHENZHEN DBK ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual voltage range of the battery is 3.700-4.200V. When the voltage of the battery is 4.000-4.200V, the battery is in a highly active state. If there is a micro-short circuit inside, it is easy to catch fire and cause a fire, which is a great threat to production and storage. When the voltage of the battery is 3.700-4.000V, the voltage is in the plateau period, the aging cycle is short, and it is difficult to pick out low-voltage batteries in a short time. In order to completely pick out bad batteries, the aging cycle must be extended, which increases time and labor. ,Logistics costs

Method used

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  • Aging method of lithium ion battery
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  • Aging method of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Using lithium cobalt oxide as the positive electrode material, a polymer 554060P 1500mAh cell was made, charged to 3.700V with constant current and constant voltage, aged at 85.0°C for 6 hours (hours), and the voltage of the battery was tested. The voltage trend is as follows figure 1 As shown, there is a voltage difference of about 0.20V between the good product and the defective product after the battery is aged for 6 hours, and the defective product can be accurately picked out by measuring the voltage. The voltage difference is 0.05V, which means that the defective products may be picked out after the battery is aged for 1 hour. Here, the purpose of constant current and constant voltage charging is to maintain the voltage consistency of the battery before aging.

Embodiment 2

[0017] Example 2: Using lithium cobalt oxide as the positive electrode material, a polymer 554060P 1500mAh battery cell was made, charged to 3.550V with constant current and constant voltage, aged at 85.0°C for 6 hours, and the voltage of the battery was tested. The voltage trend is as follows figure 2 As shown, there is a voltage difference of more than 0.25V between the good product and the defective product after the battery is aged for 6 hours, and the defective product can be accurately picked out by measuring the voltage. Compared with Example 1, it shows that within a limited voltage range and other conditions are the same, the lower the voltage charged to the battery cell, the easier it is to distinguish defective products.

Embodiment 3

[0018] Example 3: Using lithium cobaltate as the positive electrode material, a polymer 554060P 1500mAh battery cell was made, charged to 3.700V with constant current and constant voltage, aged at 45.0°C for 6 hours, and the voltage of the battery was tested. The voltage trend is as follows: image 3 As shown, there is a voltage difference of 0.08V between the good product and the defective product after the battery is aged for 6 hours, and the defective product can be accurately picked out by measuring the voltage. Compared with Example 1, it shows that within a limited temperature range and other conditions are the same, the higher the aging temperature, the easier it is to distinguish defective products.

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Abstract

The invention discloses an aging method of a lithium ion battery. The aging method includes the steps of charging the lithium ion battery in the constant current and the constant voltage until the voltage of the lithium ion battery reaches 3.000V to 3.700V, then, placing the lithium ion battery in an environment with the temperature from 45.0 DEG C to 85.0 DEG C to be aged for 1h to 24h. According to aging method, on the premise that safety production is ensured in the aging process, the aging time is greatly shortened, batteries with internal micro short circuits are more effectively selected, and batteries with potential safety hazards are prevented from entering the market.

Description

technical field [0001] The invention relates to an aging process for a lithium ion battery, in particular to an aging method for a rechargeable lithium ion secondary battery. Background technique [0002] Due to the characteristics of high energy density, high voltage and light weight of lithium-ion batteries, the application of lithium-ion batteries in mobile phones, digital products, notebooks and tablet computers, electric bicycles, electric vehicles and other fields has developed rapidly in recent years. , and become the mainstream product in the secondary battery market. [0003] Lithium-ion batteries (hereinafter referred to as batteries) are mainly a type of secondary battery that uses metal oxides as the positive electrode, carbon or alloy materials as the negative electrode, and organic electrolytes as the electrolyte. When the battery is in a higher charging state, the internal materials of the battery are in an active state. Once there is a micro-short circuit in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 李文杨宪宝
Owner SHENZHEN DBK ELECTRONICS
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