Method for detecting service life of lithium ion battery for electric vehicle
A lithium-ion battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as difficult detection, large errors, and insignificant differences in battery charge and discharge time, and achieve accuracy and convenience. Effect
Pending Publication Date: 2020-11-06
湖州快驴科技有限公司
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[0004] It is very important to test the cycle life of lithium batteries. The traditional detection method is to charge and discharge the lithium battery, record the charging and discharging time, and compare it with the comparison table to determine the cycle life of the lithium battery. The detection method, in the detection, has a large error, and the prediction of the cycle life of the lithium battery is not accurate. At the same time, the difference in the charge and discharge time of the battery in the short-term of the lithium battery is not obvious, it is difficult to detect, and it cannot meet the detection needs of the lithium battery.
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[0022] Such as figure 1 As shown, the present invention provides a kind of technical scheme: a kind of detection method of lithium-ion battery life-span for electric vehicle, comprises the following steps:
[0023] Step 1. Connect the lithium battery to be tested with the charger, and the charger will charge the lithium battery to be tested with a constant current, then charge it in constant voltage mode, and record the charging data of the lithium battery terminal to be tested.
[0024] Step 2: Connect the charged lithium battery to be tested with a discharge load, discharge the lithium battery to be tested with a constant current, and record the terminal discharge data of the lithium battery to be tested.
[0025] Step 3: Measure the internal impedance of the lithium battery to be detected, and record the impedance data, which includes the sensor current value, the lithium battery current value and the ratio of the two currents.
[0026] Step 4: Establish a fitting relation...
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The invention provides a method for detecting the service life of a lithium ion battery for an electric vehicle, and relates to the technical field of lithium batteries. The method achieves the accurate prediction of the cycle life of a lithium battery, facilitates the detection, and comprises the following steps: S1, connecting a to-be-detected lithium battery with a charger, performing constant-current charging on the to-be-detected lithium battery by the charger, then performing charging in a constant-voltage mode, and recording the charging data of the to-be-detected lithium battery terminal. According to the invention, when a lithium battery is charged and discharged, data recording and impedance measuring are performed, a fitting relation is established, the capacity degradation curve of the lithium battery is further established and intersects with a failure threshold value to obtain the accurate cycle life of the lithium battery, and the cycle life of the lithium battery can bedetected under the condition that the charging and discharging frequency interval of the lithium battery is short, so that the detection precision is guaranteed, and use is convenient.
Description
technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a detection method for the service life of lithium ion batteries used in electric vehicles. Background technique [0002] Due to the advantages of high working voltage, small size, light weight, specific energy quotient, long life and low self-discharge rate, lithium-ion batteries have become energy storage power sources for electric vehicles replacing traditional nickel-hydrogen and nickel-cadmium batteries. Life state is the core content of its reliability research. [0003] In general, the remaining life prediction refers to "cycle life", which is defined as the number of charge and discharge cycles that the battery undergoes before the capacity drops to a specified value under a certain charge and discharge system. For many applications of lithium batteries, When the lithium battery is fully charged, when the actual capacity drops to 70% of the rated capacity, it i...
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IPC IPC(8): G01R31/392
CPCG01R31/392
Inventor 雷明珠魏宏亮张洋武英杰
Owner 湖州快驴科技有限公司