Method for testing residual capacity of echelon lithium battery
A technology of battery remaining capacity and test method, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems affecting the recovery and utilization of echelon batteries, large resource investment, and long testing time, and achieves the promotion of recycling and echelon. Utilize, improve screening efficiency, design scientific effects
Pending Publication Date: 2022-03-25
红安力神动力电池系统有限公司
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Therefore, not only the resource investment is large, but also the test time is long and the test efficiency is low, which affects the recycling and utilization of cascaded batteries
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[0041] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0042] see figure 1 , the invention provides a method for testing the remaining capacity of a step-by-step lithium battery, comprising the following steps:
[0043] The first step is to classify batteries: for multiple cascaded batteries to be tested, classify them according to specifications and models, and screen out multiple cascaded batteries corresponding to each specification and model;
[0044] The second step is to measure the sample battery: select a preset specification and model, and use the preset multiple (for example, 250, that is, multiple batteries of the same specification and model) echelon batteries corresponding to the specification and model as the sample battery. Each sample battery is subjected to a preset capacity te...
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The invention discloses a method for testing the residual capacity of echelon lithium batteries. The method comprises the following steps of: 1, classifying a plurality of echelon batteries to be tested according to specifications and models; step 2, taking a plurality of echelon batteries corresponding to the preset specification and model as sample batteries, respectively carrying out preset capacity test operation on each sample battery, testing to obtain the discharge capacity C1 of each sample battery, and respectively measuring to obtain the alternating-current internal resistance R1 of each sample battery; 3, drawing a scatter diagram of the alternating-current internal resistance R1 and the discharge capacity C1 of the sample battery; 4, fitting to obtain a fitting curve and a quantitative relational expression of the alternating-current internal resistance and the discharge capacity of the sample battery; and 5, measuring the alternating current resistance of the echelon battery of which the discharge capacity is to be tested, and substituting the alternating current resistance into the quantitative relational expression to obtain the discharge capacity of the echelon battery, namely the residual capacity. According to the invention, the residual capacity of the echelon battery can be rapidly and reliably detected, and the screening efficiency of the cell state of the echelon battery is improved.
Description
technical field [0001] The invention relates to the technical field of recovery and utilization of lithium iron phosphate batteries, in particular to a method for testing the remaining capacity of lithium iron phosphate batteries. Background technique [0002] At present, the decommissioned lithium-ion batteries (ie, secondary batteries) are in various states and have poor consistency. In order to realize the recovery and reuse of decommissioned lithium-ion batteries (that is, cascade utilization), it takes a lot of manpower to disassemble, and a large number of testing equipment is equipped to test the capacity of the batteries, and then sorting and matching groups are carried out to finally obtain the batteries that meet the expectations. Ladder batteries with capacity requirements. Therefore, not only the resource investment is large, but also the test time is long and the test efficiency is low, which affects the recycling and utilization of cascade batteries. [0003]...
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IPC IPC(8): G01R31/3842G01R31/389
CPCG01R31/3842G01R31/389
Inventor 夏鹏张习玖柳飞飞
Owner 红安力神动力电池系统有限公司