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A method for assemblage of soft-pack power batteries
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A power battery and matching technology, used in secondary batteries, battery assembly machines, secondary battery manufacturing, etc., can solve problems such as battery inconsistency, affecting cycle life, etc., to improve consistency, prolong service life, and low cost. Effect
Active Publication Date: 2021-01-19
福建冠城瑞闽新能源科技有限公司
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Problems solved by technology
However, in the middle and later stages of the battery cycle, the polarization of the battery will cause the inconsistency of the battery and affect the cycle life.
Method used
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Embodiment 1
[0043] Please refer to Figure 1 to Figure 2 , Embodiment 1 of the present invention is:
[0044] A method for assemblage of soft pack power batteries,
Embodiment
[0048] (1) Randomly select 1000pcs batteries in the comparative example, and adjust the batteries to 50% SOC;
[0049] (2) Discharge the battery at 0.2C for 10s, charge at 0.2C for 10s; discharge at 0.5C for 10s, charge at 0.5C for 10s; discharge at 1C for 10s, charge at 1C for 10s; discharge at 2C for 10s, charge at 2C for 10s; discharge at 3C for 10s, charge at 3C for 10s.
[0050] (3) Calculate the DCR value of 10s pulse discharge at 0.2C, 0.5C, 1C, 2C, and 3C rates respectively, and subtract the DCR value of 0.5C from the DCR value of 0.2C to obtain D 1 , 0.5C DCR value minus 1C DCR value to get D 2 , the DCR value of 1C minus the DCR value of 2C to get D 3 , the DCR value of 2C minus the DCR value of 3C to get D 4 . Will D 1 ,D 2 ,D 3 ,D 4 Find the arithmetic mean to get D 0 . press D 0 The values are sorted from large to small, and each 196pcs is divided into one file for matching. The following table is the grouping data of some batteries after binning for ...
Embodiment 2
[0053] Please refer to Figure 1 to Figure 2 , the second embodiment of the present invention is:
[0054] A method for assembling soft pack power batteries, comprising the following steps:
[0055] S1, testing the finished battery;
[0056] S2. Initially grade the finished batteries obtained after the test in step S1;
[0057] S3. Adjusting the batteries obtained after the initial binning in step S2 to the same state of charge of the batteries;
[0058] S4, performing pulse charging and discharging at different rates on the battery under the same state of charge of the battery in step S3;
[0059] S5. Calculating the absolute value of the difference of the DC internal resistance of the battery in step S4 under different rate pulse charging and discharging states;
[0060] S6. Calculate and average the absolute values of all the differences obtained in step S5;
[0061] S7. Sort according to the magnitude of the average value calculated in step S6 to obtain the final matc...
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Abstract
The invention relates to the technical field of batteries, in particular to a method for assembling soft pack power batteries. It includes the following steps: classify according to the capacity of the battery; test the battery obtained after the classification in step S1; perform initial classification on the battery obtained after the test in step S2; adjust the battery obtained by the initial classification in step S3 to the same battery State of charge: Perform pulse charging and discharging at different rates on the batteries in the same state of charge of the battery in step S4; obtain the final grouping. In the present invention, after the conventional grouping and grouping, the average value of the DC internal resistance of the batteries with different rates of pulse charging and discharging is added to sort, so that the polarization conditions of the batteries that are finally grouped tend to be the same, which can effectively improve the cycle time of the battery pack. The consistency of batteries in the middle and later stages can prolong the service life of battery packs. This grouping method can be realized through the existing capacity distribution equipment of the enterprise, without adding new equipment, low cost and strong practicability.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to a method for assembling soft pack power batteries. Background technique [0002] In recent years, with the vigorous development of the electric vehicle industry, the requirements for vehicle power batteries, especially lithium-ion batteries, are getting higher and higher. Different from the single lithium-ion battery used in traditional 3C products, the car battery pack is composed of hundreds of thousands of lithium-ion batteries connected in series and parallel, and the consistency of the single battery will directly affect the service life of the battery pack and the electric vehicle. cruising range. [0003] Power batteries are generally divided into soft pack batteries, square shell batteries, and cylindrical batteries according to their shape and packaging materials. The shell of the pouch battery is made of flexible aluminum-plastic film material, which is safer than t...
Claims
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