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Lithium-ion battery charging method and lithium-ion battery charging device

A lithium-ion battery and charging method technology, which is applied in battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve the problems of user inconvenience in charging time, reduce the risk of lithium analysis, and reduce the full charge time , Improve the safety performance and service life effect

Active Publication Date: 2022-06-24
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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  • Lithium-ion battery charging method and lithium-ion battery charging device
  • Lithium-ion battery charging method and lithium-ion battery charging device
  • Lithium-ion battery charging method and lithium-ion battery charging device

Examples

Experimental program
Comparison scheme
Effect test

experiment Embodiment 1

[0080] A lithium-ion battery with a model 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 precipitate lithium; it supports a maximum charging of 1.7C, and the lithium deposition voltage potential is 4.2V.

[0082] The specific steps for charging are:

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

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

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

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

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

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

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

experiment Embodiment 2

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

[0102] Before the experiment, it was confirmed that the model system supports 3.0C DC charging, and the battery does not precipitate lithium; it supports a maximum charging of 3.3C, and the voltage potential of lithium evolution is 4.2V.

[0103] The specific steps for 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] ② Discharge at 20mAh for 5 seconds;

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

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

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

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

[0110] ⑦Keep the rated voltage 4.45V constant voltage charge to 216mA (0.12C), and the timing chargi...

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Abstract

The disclosure relates to a charging method for a lithium ion battery and a charging device for the lithium ion battery. The charging method of lithium-ion battery comprises: obtaining the polarization property of lithium-ion battery, and polarization property comprises the anode of lithium-ion battery and does not analyze the maximum charging current of lithium; According to the polarization property, it is determined that according to the stepwise charging sequence, the current value decreases progressively. Multi-stage charging constant current; charge the lithium-ion battery step by step with multi-stage charging constant current, and after each stage of charging, let the lithium-ion battery stand still or discharge the lithium-ion battery at a preset discharge current that is less than the maximum charging current; when the lithium-ion When the voltage of the battery reaches the constant current cutoff voltage, constant voltage charging is performed with the constant current cutoff voltage as a constant voltage. Various embodiments of the present disclosure effectively reduce the polarization of the battery, thereby reducing the full charge time of the lithium-ion battery.

Description

technical field [0001] The present disclosure relates to the technical field of batteries, and in particular, to a charging method for a lithium ion battery and a charging device for the lithium ion battery. Background technique [0002] In the related art, with the development of battery technology, lithium-ion batteries are widely used because of their large power, long battery life, light weight, low price, and high safety, and are currently widely used in mobile terminals such as mobile phones and tablets. [0003] However, on the one hand, the lithium-ion battery will produce lithium deposition at the anode during the charging process, 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 lithium-ion batteries. [0004] On the other hand, the charging time of lithium-ion batteries is usually several hours, which is inconvenient for users. Therefore, the need for fast charging ...

Claims

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Application Information

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Patent Type & Authority Patents(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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