Lithium battery detection method and device
A detection method and technology for lithium batteries, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of not fully considering the resistance time of lithium batteries, can only be applied to different, and the charging and discharging test time varies greatly. Achieve the effect of prolonging the charging and discharging test time, eliminating polarization and good data support
Active Publication Date: 2021-07-20
BEIJING ELECTRIC VEHICLE
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[0004] The embodiment of the present invention provides a lithium battery detection method and device, which is used to solve the problem that the initial static voltage is used as the balance voltage of the lithium battery in the prior art, and the charging and discharging test time changes greatly, and the impedance of the lithium battery is not fully considered. The time required for each link in the process, the measured value can only be applied to the reference value of the internal resistance of different types of lithium batteries
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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0032] The present invention aims at using the initial static voltage as the balance voltage of the lithium battery in the prior art, and the change in the charge and discharge test time is relatively large, and the time required for each link in the impedance of the lithium battery is not fully considered, and the measured value can only be applied to For the reference value of the internal resistance of different types of lithium batteries, a detection method and device for lithium batteries are provided.
[0033] Such as figure 1 Shown, a kind of detection method of lithium battery comprises:
[0034] Step 11, controlling the lithium battery to discharge to a preset remaining capacity with a first constant current, and detecting the first voltag...
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The invention provides a lithium battery detection method and device, and the method comprises the steps: controlling a lithium battery to discharge at a first constant current to a preset residual electric quantity, and detecting a first voltage value at a discharge end moment; controlling the lithium battery to execute at least one charge-discharge cycle process, wherein each charge-discharge cycle process comprises a charge-discharge cycle process of a first sequence of continuously charging for a first preset time period with a second constant current and continuously discharging for a first preset time period with the second constant current after standing for a preset time in sequence, or a charge-discharge cycle process of a second sequence of discharging and then charging in the same method; obtaining a voltage average value of the lithium battery at the end of each charge-discharge cycle process to obtain a second voltage value; and according to the first voltage value and the second voltage value of the lithium battery, calculating the internal resistance of the lithium battery at the preset residual electric quantity. The method can accurately measure the instant or stable DC internal resistance value of the lithium battery in any state.
Description
technical field [0001] The invention relates to the field of performance detection of lithium batteries, in particular to a detection method and device for lithium batteries. Background technique [0002] The impedance of a lithium-ion lithium battery is mainly composed of the ionic impedance inside the lithium battery, including the process impedance of lithium ion solvation / desolvation, the impedance of the SEI film through the solid electrolyte interface, the electrochemical reaction impedance, and the lithium ion in the solid phase material. The time required for various impedances to occur is different, and the time required for solid phase mass transfer resistance to occur is the longest. If the collection time is short, the mass transfer of lithium ions inside the lithium battery has not yet occurred. When the dynamic balance is reached, the DC internal resistance is low and the working voltage is high. It can only be used for instantaneous internal resistance measure...
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IPC IPC(8): G01R31/385G01R31/389
CPCG01R31/385G01R31/389Y02E60/10
Inventor 戴权
Owner BEIJING ELECTRIC VEHICLE