Method for detecting charge state of lithium ion battery
A lithium-ion battery, state-of-charge technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of low test efficiency and test accuracy, long battery rest time, and inability to quickly and accurately estimate lithium-ion batteries. State of charge and other issues to achieve the effect of improving reliability and accuracy, saving resources, and saving time and cost
Active Publication Date: 2019-04-09
CHINA ELECTRIC POWER RES INST +2
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[0003] The state of charge is an important indicator of the performance of lithium-ion batteries, and its accurate estimation is one of the prerequisites and key technologies for the operation of the battery management system. The long standing time, low test efficiency and test accuracy cannot meet the requirements of quickly and accurately estimating the state of charge of lithium-ion batteries for electric vehicles
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0027] This embodiment discloses a method for detecting the state of charge of a lithium-ion battery, comprising the following steps:
[0028] 1) Place the lithium-ion battery in a constant temperature environment and let it stand for a set time;
[0029] Wherein, the setting time is 0.5~3h; the temperature of the constant temperature environment is -20~40°C.
[0030] 2) After standing still for a set time, charge the lithium-ion battery with a constant current until it is fully charged, and then stand still for 2 to 5 hours;
[0031] In one embodiment, the charging rate during the charging process is 0.1-3C.
[0032] 3) Perform constant current discharge on the lithium-ion batt...
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The invention discloses a method for detecting a charge state of a lithium ion battery. The method comprises the following steps of firstly putting the lithium ion battery into a constant-temperatureenvironment, and standing for a set time; performing constant-current charging on the battery until the battery is fully charged; performing constant-current discharging on the battery, and measuringdynamic impedance of the battery once after a charge state value of the lithium ion battery is lowered by a set value in the discharging process; dynamic impedance graphs of different charge states are made according to the obtained dynamic impedance of the battery; an equivalent circuit is established, and the dynamic impedance of the battery is fitted according to the equivalent circuit to obtain fitted data; and constant phase angle element parameters in the fitted data are extracted, and the charge state of the lithium ion battery is calculated out according to the constant phase angle element parameters. The reliability and accuracy of battery charge state detection are improved, and the detection efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for detecting the state of charge of a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C products and electric vehicles due to their advantages such as high specific energy. Lithium-ion batteries are used as power batteries in electric vehicles. The battery management system (BMS) of electric vehicles ensures the safe and reliable operation of electric vehicles by effectively controlling and managing the on-board power batteries. [0003] The state of charge is an important indicator of the performance of lithium-ion batteries, and its accurate estimation is one of the prerequisites and key technologies for the operation of the battery management system. The long standing time, low test efficiency and test accuracy cannot meet the requirements of quickly and accurately estimating the state of charge of the lithi...
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IPC IPC(8): G01R31/387
Inventor 耿萌萌杨凯方陈阮一钊张宇时珊珊范茂松张明杰高飞刘皓王康康王凯丰
Owner CHINA ELECTRIC POWER RES INST