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Non-constant-voltage charging method for lithium ion battery capable of correcting and compensating voltage

一种锂离子电池、恒压充电的技术，应用在二次电池充电/放电、电池电路装置、二次电池等方向，能够解决电池充饱、充饱程度只达到、充饱程度只达到97％等问题，达到长循环寿命、充电快的效果

Active Publication Date: 2016-05-25
GUANGZHOU FULLRIVER BATTERY NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When this method is applied to lithium iron phosphate batteries, Uo is the standard charging cut-off voltage 3.60V used in the small rate constant current-constant voltage charging method generally accepted by the industry, and it is charged to the battery charging limit voltage U=2Uo-Us. Fully charge the battery, the full charge is only about 88%, and the battery performance cannot be fully utilized
The standard charging cut-off voltage Uo used in the small-rate constant current-constant voltage charging method generally accepted by the lithium iron phosphate battery industry is 3.50V, 3.65V, and 3.7V. Failed to fully charge the battery and failed to give full play to the performance of the battery
[0004] When this method is applied to lithium cobalt oxide batteries, Uo is the standard charging cut-off voltage 4.20V used in the small rate constant current-constant voltage charging method generally accepted by the industry, and it is charged to the battery charging limit voltage U=2Uo-Us. Fully charge the battery, the full charge is only about 97%, and the performance of the battery cannot be fully utilized

Method used

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  • Non-constant-voltage charging method for lithium ion battery capable of correcting and compensating voltage
  • Non-constant-voltage charging method for lithium ion battery capable of correcting and compensating voltage
  • Non-constant-voltage charging method for lithium ion battery capable of correcting and compensating voltage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1: lithium iron phosphate battery, the inventive method

[0068] With the battery of Comparative Example 1.1, use the stable voltage Us measured in Comparative Example 1.2;

[0069] 1. Measure the standard stable voltage: Charge to 3.6V with 38mA (0.2C) constant current, turn to constant voltage 3.6V to charge until the current decreases to 3.8mA (0.02C), stop, test the open circuit voltage, and measure the standard stable voltage Uso , the standard stable voltage Uso curve is shown in the attached figure 1 ;When the battery stops constant current and constant voltage charging and starts to be put on hold, it is timed, and every 10 minutes is regarded as a time period. When the battery starts from a certain time period, the open circuit voltage drop of the battery within 10 minutes can be regarded as less than 1mV. The voltage of the battery has reached stability, and the voltage corresponding to the first time point of this time period is taken as the stan...

Embodiment 2

[0108] Embodiment 2: lithium cobalt oxide battery, method of the present invention

[0109] With the battery of Comparative Example 2.1, use the stable voltage Us measured in Comparative Example 2.2;

[0110] 1. Measure the standard stable voltage: Charge to 4.2V with 160mA (0.2C) constant current, turn to constant voltage 4.2V to charge until the current decreases to 16mA (0.02C), stop, test the open circuit voltage, and measure the standard stable voltage Uso, The standard stable voltage Uso curve is attached figure 2 ;When the battery stops constant current and constant voltage charging and starts to be put on hold, it is timed, and every 10 minutes is regarded as a time period. When the battery starts from a certain time period, the open circuit voltage drop of the battery within 10 minutes can be regarded as less than 1mV. The voltage of the battery has reached stability, and the voltage corresponding to the first time point of this time period is taken as the standard s...

Embodiment 3

[0148] Embodiment 3: 4.35V high-voltage lithium cobalt oxide battery, the method of the present invention

[0149] With the battery of Comparative Example 3.1, use the stable voltage Us measured in Comparative Example 3.2;

[0150] 1. Measure the standard stable voltage: Charge to 4.35V with 47mA (0.2C) constant current, turn to constant voltage 4.35V to charge until the current decreases to 4.7mA (0.02C), stop, test the open circuit voltage, and measure the standard stable voltage Uso , the standard stable voltage Uso curve is shown in the attached image 3 ;When the battery stops constant current and constant voltage charging and starts to be put on hold, it is timed, and every 5 minutes is regarded as a time period. When the battery starts from a certain time period, the open circuit voltage drop of the battery within 5 minutes is less than 2mV. The voltage of the battery has reached stability, and the voltage corresponding to the first time point of this time period is ta...

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Abstract

The invention discloses a non-constant-voltage charging method for a lithium ion battery capable of correcting and compensating voltage. According to the charging method, when the voltage of the battery in charging reaches a charging limiting voltage, the charging process is stopped; the charging limiting voltage between two electrodes of a battery is set to U=3Uo-Us-Uso, wherein Uso refers to a standard steady voltage of battery voltage drop after the battery is charged to Uo in a constant-current and constant-voltage manner; Us refers to a steady voltage of the battery voltage drop after the battery is charged to Uo in a constant-current manner; Uo refers to a standard charge cut-off voltage; the selection of Uso is from the moment when the constant-current and constant-voltage charging for the battery is stopped; the battery is charged from a certain time frame; when the open-circuit voltage drop of the battery is less than a certain numerical value within a certain time frame, and when the voltage of the battery is steady, a voltage corresponding to the first time point within the time frame is selected as the standard steady voltage Uso of the battery. The charging method is high in charging speed, and almost saturated electric quantity can be charged for the battery; by adoption of the charging method, the charged battery has a longer cycling life when the battery is discharged by a standard method or a user's method; or under the same number of cycles, the discharged capacity of the battery is higher when the battery is charged by the charging method provided by the invention.

Description

technical field [0001] The invention belongs to the technical field of battery charging methods, in particular to a non-constant voltage charging method for lithium ion batteries and polymer lithium ion batteries. Background technique [0002] Chinese patent CN101388477B discloses a fast charging method, which is a lithium-ion battery charging method that increases the charging limit voltage to compensate for the internal voltage drop of the battery. When a lithium-ion battery or a polymer lithium-ion battery is charging, when the charging voltage reaches the charging limit voltage, Stop charging, and the battery charging limit voltage between the two poles of the battery is set to U=2Uo-Us, Us is the stable voltage of the battery voltage after constant current charging to Uo, Uo is the standard charging cut-off voltage, Uo is generally accepted by the industry The standard charging cut-off voltage used in the small rate constant current-constant voltage charging method, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/446H01M10/448H01M10/44H01M10/0525Y02E60/10H02J7/007182H02J7/007188H01M10/02
Inventor 唐胜成曾石华李利易世明
Owner GUANGZHOU FULLRIVER BATTERY NEW TECH
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