Charging method for lithium ion battery management system

A technology of lithium ion battery and management system, applied in the charging field of battery management system, can solve problems such as unrealizable, achieve the effect of improving efficiency, charging efficiency, and improving anode lithium deposition

Active Publication Date: 2019-12-24
HENAN LI POWER SUPPLY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of reducing the anode polarization by increasing the discharge and shelving the process during the charging process cannot be realized in the actual battery management system, because the minimum charging current of the charging pile is 5A, and if it is lower than this value, it will fail and stop Charge

Method used

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  • Charging method for lithium ion battery management system
  • Charging method for lithium ion battery management system
  • Charging method for lithium ion battery management system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The state of charge is 0%, and its corresponding voltage is V 0 (V 0 <3.68V), the lithium-ion battery whose battery surface temperature is -10°C is charged in a constant temperature environment of -10°C according to the charging method of the lithium-ion battery management system of the present invention, and the specific steps are as follows:

[0070] 1) With a current of 0.15I 1 Charge the battery with a constant current, the charging capacity is 20% of the rated capacity of the battery, and the voltage of the battery is 3.68V at this time;

[0071] 2) With a current of 0.25I 1 Charge the battery with a constant current, the charging capacity is 10% of the rated capacity of the battery, and the voltage of the battery is 3.75V at this time;

[0072] 3) Use current 0.2I 1 Charge the battery with a constant current, the charging capacity is 25% of the rated capacity of the battery, and the voltage of the battery is 3.85V at this time;

[0073] 4) With a current of 0...

Embodiment 2

[0083] The state of charge is 0%, and its corresponding voltage is V 0 (V 0 <3.68V), the lithium-ion battery whose battery surface temperature is 0°C is charged in a constant temperature environment of 0°C according to the charging method of the lithium-ion battery management system of the present invention, and the specific steps are as follows:

[0084] 1) With a current of 0.3I 1 Charge the battery with a constant current, and the charging capacity is 20% of the rated capacity of the battery. At this time, the voltage of the battery is 3.68V.

[0085] 2) With a current of 0.45I 1 Charge the battery with a constant current, and the charging capacity is 10% of the rated capacity of the battery. At this time, the voltage of the battery is 3.75V.

[0086] 3) With a current of 0.35I 1 Charge the battery with a constant current, and the charging capacity is 25% of the rated capacity of the battery. At this time, the voltage of the battery is 3.85V.

[0087] 4) With a current...

Embodiment 3

[0096] The state of charge is 0%, and its corresponding voltage is V 0 (V 0 <3.68V), the battery surface temperature is 5 ℃ of lithium-ion batteries, under the constant temperature environment of 5 ℃, according to the charging method of lithium-ion batteries of the present invention, the battery is charged with multi-stage current and constant current, and the specific steps are as follows:

[0097] 1) With a current of 0.4I 1 Charge the battery with a constant current, and the charging capacity is 20% of the rated capacity of the battery. At this time, the voltage of the battery is 3.68V.

[0098] 2) With a current of 0.6I 1 Charge the battery with a constant current, and the charging capacity is 10% of the rated capacity of the battery. At this time, the voltage of the battery is 3.75V.

[0099] 3) With a current of 0.5I 1 Charge the battery with a constant current, and the charging capacity is 25% of the rated capacity of the battery. At this time, the voltage of the ba...

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Abstract

The invention discloses a charging method for a lithium ion battery management system. The method comprises a five-stage current continuous charging step. The state of charge of a battery is judged before charging, and then, different charging steps are selected according to the state of charge of the battery. When the state of charge of the battery changes, the charging steps of the battery are adjusted in time for charging until the battery is fully charged. The state of charge of the battery can be judged by measuring the voltage of the battery and comparing the measured voltage with presetvoltages in different charging states. According to the charging method for a lithium ion battery management system, a five-stage current continuous charging scheme is adopted, so that anode lithiumprecipitation of lithium ion batteries at low temperature is improved, the safety of batteries during lithium ion charging is enhanced, and the quantity of electricity charged into lithium ion batteries is increased.

Description

technical field [0001] The invention relates to a charging method for a battery management system, in particular to a charging method for a lithium-ion battery management system. Background technique [0002] New energy vehicles have become a new development hotspot in the automotive industry due to their clean and pollution-free, high energy efficiency and diversified energy sources. Lithium-ion batteries are widely used in new energy vehicles due to their high energy density, long cycle life, and high safety. As the power source of new energy vehicles, lithium-ion batteries still have many problems in practical applications, such as the energy density is significantly reduced under low temperature conditions, and the cycle life is also affected accordingly. Especially when using traditional constant current-constant voltage charging at low temperature, the lithium intercalation kinetics of the negative electrode will become worse, and the specific capacity of the negative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/446H01M10/44Y02E60/10
Inventor 杨涛蔡洪波赵俊丽李保鹏常艳李冰吕莹莹吴明霞
Owner HENAN LI POWER SUPPLY
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