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Charging method of lithium ion battery and charging device of lithium ion battery

A lithium-ion battery and charging method technology, applied in battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve the problems of user inconvenience in charging time, reduce full charging time, reduce charging constant current, The effect of reducing the charging time

Active Publication Date: 2021-03-05
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, the charging time of lithium-ion batteries is usually several hours, and the charging time is too long to cause inconvenience to the user

Method used

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  • Charging method of lithium ion battery and charging device of lithium ion battery
  • Charging method of lithium ion battery and charging device of lithium ion battery
  • Charging method of lithium ion battery and charging device of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

experiment Embodiment 1

[0080] A lithium-ion battery with a model number of 406687, a capacity of 3900mAh, and a rated voltage of 4.4V was selected for charging experiments.

[0081] Before the experiment, it was confirmed that the model system supports 1.5C DC charging, and the battery does not decompose lithium; it supports maximum charging of 1.7C, and the lithium decomposing voltage potential is 4.2V.

[0082] The specific steps of charging are:

[0083] ①Charge with a constant current of 1.7C to a voltage of 4.15V, and the charging time is about 4.2 minutes;

[0084] ② Discharge at 39mAh for 5 seconds;

[0085] ③Charge with a constant current of 1.5C to a voltage of 4.4V, and the charging time is about 20.6 minutes;

[0086] ④ Discharge at 39mAh for 5 seconds;

[0087] ⑤Charge to 4.45V with a constant current of 0.6C, and the charging time is about 1.5 minutes;

[0088] ⑥ Discharge at 39mAh for 5 seconds;

[0089] ⑦ Keep the rated voltage of 4.45V constant voltage and charge to 390mA (0.1C)...

experiment Embodiment 2

[0101] A lithium-ion battery with a model number of 334087, a capacity of 1800mAh, and a rated voltage of 4.4V was selected for charging experiments.

[0102] Before the experiment, confirm that the model system supports 3.0C DC charging, and the battery does not decompose lithium; it supports maximum charging of 3.3C, and the lithium decomposing voltage potential is 4.2V.

[0103] The specific steps of charging are:

[0104] ①Charge with a constant current of 3.3C to a voltage of 4.15V, and the timing charging time is about 2.2 minutes;

[0105] ②Discharge with 20mAh for 5 seconds;

[0106] ③Charge with a constant current of 3.0C to a voltage of 4.4V, and the timing charging time is about 9.4 minutes;

[0107] ④ Discharge at 20mAh for 5 seconds;

[0108] ⑤Charge with a constant current of 1.5C to 4.45V, and the timing charging time is about 1 minute;

[0109] ⑥Discharge with 20mAh for 5 seconds;

[0110] ⑦ Keep the rated voltage of 4.45V constant voltage and charge to 21...

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Abstract

The invention relates to a charging method of a lithium ion battery and a charging device of the lithium ion battery. The charging method of the lithium ion battery comprises the following steps: acquiring a polarization attribute of the lithium ion battery, wherein the polarization attribute comprises a maximum charging current of an anode of the lithium ion battery without separating out lithium; determining a plurality of sections of charging constant currents which are decreased progressively on the current value according to the sectional charging sequence according to the polarization attribute; respectively charging the lithium ion battery section by section by multiple sections of charging constant currents, and standing the lithium ion battery after each section of charging or discharging the lithium ion battery by a preset discharging current smaller than the maximum charging current; and when the voltage of the lithium ion battery reaches the constant-current cut-off voltage, taking the constant-current cut-off voltage as the constant voltage to carry out constant-voltage charging. According to the embodiments of the invention, the polarization of the battery is effectively reduced, so that the full-charge charging time of the lithium ion battery is reduced.

Description

technical field [0001] The present disclosure relates to the technical field of batteries, in particular to a charging method for a lithium ion battery and a charging device for a lithium ion battery. Background technique [0002] In related technologies, with the development of battery technology, lithium-ion batteries are widely used due to their large power, long battery life, light weight, low price, and high safety. Currently, they are widely used in mobile terminals such as mobile phones and tablets. [0003] However, on the one hand, during the charging process of the lithium-ion battery, lithium precipitation occurs at the anode, which affects the safety of the lithium-ion battery and shortens the service life. Therefore, there is a need for a method of how to safely charge a lithium-ion battery. [0004] On the other hand, the charging time of lithium-ion batteries is usually as long as several hours, and the charging time is too long to cause inconvenience to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/446H01M10/448H01M10/44H02J7/00711H02J7/007182H02J7/007188H01M10/0525
Inventor 杜思红
Owner BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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