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Battery formation method

A chemical formation method and secondary battery technology, applied in secondary batteries, electrochemical generators, secondary battery repair/maintenance, etc., can solve problems such as self-discharge, affecting the performance of lithium-ion secondary batteries, energy waste, etc., to achieve The effect of reducing the ratio, suppressing the self-discharge phenomenon, and avoiding energy waste

Inactive Publication Date: 2012-08-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-ion secondary battery formed by this method has a serious self-discharge phenomenon during storage, and the problem of a large ratio of low-voltage batteries seriously affects the performance of the lithium-ion secondary battery and causes a waste of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 10,000 normal production batteries LP463446ARU after liquid injection, charge them to 3.4V with 0.03C current, and leave them for 5 minutes with a discharge current of 0.05C and a charge current of 0.03C at 3.4V-2.3V cycle charge and discharge 4 times , Charging current is 0.03C, discharging current is 0.05C, and the injection hole is sealed. After aging for 3 days, continue to charge the battery with a constant current of 0.1C to 4.1V and complete the formation, obtaining the formed lithium ion battery A1.

Embodiment 2

[0025] Take 10,000 normal production batteries LP463446ARU after injection, charge them to 3.5V with 0.03C current, and leave them for 5 minutes with a discharge current of 0.05C and a charge current of 0.03C at 3.5V-2.3V cycle charge and discharge twice , Charging current is 0.03C, discharging current is 0.05C, and the injection hole is sealed. After aging for 3 days, continue to charge the battery with a constant current of 0.1C to 3.85V and complete the formation, obtaining the formed lithium ion battery A2.

Embodiment 3

[0027] Take 1 million normally produced LP463446ARU battery after injection, charge it to 3.7V with a current of 0.05C, and then charge and discharge 2 cycles at 3.5V-2.3V with a discharge current of 0.08C and a charge current of 0.05C after being left for 5 minutes. . Continue to charge to 3.7V with a constant current of 0.05C and seal the injection hole. After aging for 3 days, continue to charge the battery with a constant current of 0.1C to 4.0V and complete the formation, and the formed lithium ion battery A3 is obtained.

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PUM

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Abstract

The invention discloses a battery formation method, which comprises the following steps of: performing formation on a battery at a formation temperature; charging the battery to V2 volt with constant current in the first stage; discharging the battery for at least one time with circulating constant current of V2-V1 volt; and charging the battery to V3 volt with the constant current in the second stage, wherein the voltage V2 is more than the voltage V1 and is less than the voltage V3. The battery formation method can prevent metallic impurities from forming lithium dendrites so as to effectively inhibit the self-discharge effect of the battery and reduce the low voltage ratio of the battery.

Description

Technical field [0001] The invention relates to a battery formation method, in particular to a lithium ion secondary battery formation method. Background technique [0002] Lithium-ion battery is a new type of chemical power source. Because of its high energy density, high working voltage, long life and environmental protection, it is widely used in portable electronic products such as mobile phones. [0003] Formation refers to the process of charging and discharging the battery for the first time. The formation step of the lithium ion secondary battery is an important stage in the manufacture of the battery, and the formation is related to the battery's capacity, self-discharge performance and many other qualities. [0004] The current formation method of lithium-ion secondary rechargeable batteries is: first charge with a low current constant current of 0.01C-1C, then charge with a large current of 0.05C-10C, and then age at 30-80℃ for 0.5 -160 hours. The lithium ion secondary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M10/44
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 邓慧芬雷裕东刘卫平
Owner BYD CO LTD