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Soft-pack power battery matching method
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A technology of power battery and grouping, applied in secondary batteries, battery assembly machines, secondary battery manufacturing, etc., can solve problems such as affecting cycle life and battery inconsistency, and achieve long service life, improve consistency, and low cost. Effect
Active Publication Date: 2019-08-02
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 under the charge and discharge state of different rate pulses in step S4;
[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 m...
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Abstract
The invention relates to the technical field of batteries, in particular to a soft-pack power battery matching method comprising the following steps: classifying according to the capacity of batteries; testing the batteries obtained by classifying in step S1; performing initial grading on the batteries obtained after the test in step S2; adjusting the batteries obtained after initial grading in step S3 to the same state of charge; performing charging and discharging on the batteries under the same state of charge in step S4 with pulses of different magnification; and obtaining the final match.After conventional grading and matching, the step of performing the test of different magnification of pulses of charging and discharging is additionally arranged and the average value of the batteryDC internal resistance polarization difference is sorted so that that the polarization situation of the batteries of the final group tends to be the same, the battery consistency of the battery packcirculating to the middle and late periods can be effectively improved and the service life of the battery pack can be prolonged. The matching method can be realized through the existing capacity dividing equipment of the enterprise without adding new equipment, and the cost is low and the practicability is high.
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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