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A kind of lithium-ion battery aging method
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A lithium-ion battery and battery technology, applied in the field of lithium batteries, can solve the problems of affecting battery life, low production efficiency, slow interface reaction, etc., and achieve the effects of excellent cycle performance, improved production efficiency, and short aging time.
Active Publication Date: 2017-06-06
JIANGSU ZHIHANG NEW ENERGY
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[0004] At present, the conventional lithium-ion battery aging method is to leave the lithium-ion battery at room temperature for more than two weeks after it is first charged and formed. This method is left at room temperature, and the interface reaction is relatively slow. The formation of the SEI film Incomplete, side reactions will continue to occur in the subsequent charging and discharging process, the capacity of the battery will decay, and the life of the battery will be affected
At the same time, the ambient temperature under normal temperature conditions cannot be guaranteed, and different ambient temperatures will have differences in the internal resistance and self-discharge of the battery, resulting in poor consistency of the selected batteries
Moreover, the method has a long standing time and low production efficiency, which affects large-scale mass production.
Method used
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Embodiment 1
[0026] Step 1: Perform the first stage of standing for the formed battery, that is, standing for 24 hours at 40°C;
[0027] Step 2: Perform the second stage of standing for the battery after the first stage of standing, that is, standing for 72 hours at 25°C;
[0028] Step 3: Perform the third stage of standing on the battery that has passed the second stage of standing, that is, standing at -10°C for 48 hours, and the aging of the lithium ion battery is completed.
[0031] Step 1: Perform the first stage of standing for the formed battery, that is, stand for 48h at 45°C;
[0032] Step 2: Perform a second stage of standing for the battery that has passed the first stage of standing, that is, standing for 48 hours at 25°C:
[0033] Step 3: Perform the third stage of standing for the battery that has passed the second stage of standing, that is, standing for 72 hours at -10°C, and the aging of the lithium ion battery is completed.
[0034] After aging the lithium ion battery using this method, the following data are obtained: the internal resistance is 3.4mΩ, the first discharge capacity is 8.065Ah, the 200th discharge capacity is 7.750Ah, and the 200th week capacity retention rate is 96.1%.
Embodiment 3
[0036] Step 1: Perform the first stage of standing for the formed battery, that is, stand for 24h at 45°C;
[0037] Step 2: Perform a second stage of standing for the battery that has passed the first stage of standing, that is, standing for 24 hours at 15°C;
[0038] Step 3: Perform the third stage of standing on the battery that has passed the second stage of standing, that is, standing at -20°C for 48 hours;
[0039] Step 4: Perform step 1 to step 3 once in a loop until the aging of the lithium ion battery is complete.
[0040] After aging the lithium ion battery using this method, the following data are obtained: the internal resistance is 3.3mΩ, the first discharge capacity is 8.055Ah, the 200th discharge capacity is 7.781Ah, and the 200th week capacity retention rate is 96.6%.
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Abstract
The invention relates to an aging method for a lithiumion battery, comprising the following steps: Step 1: perform a first stage of standing for the formed battery according to a first preset ambient temperature and a first preset time; The batteries that have been left standing in the first stage are allowed to stand in the second stage according to the second preset ambient temperature and the second preset time; For three preset times, the third stage of standing is performed; Step 4: Repeat steps 1 to 3 according to a predetermined number of cycles, until the aging of the lithium-ion battery is completed. The invention overcomes the disadvantages of long aging time and poor battery performance after aging in the conventional lithiumion battery aging method. The method of the invention can select batteries with poor high and low temperature performance, ensuring the consistency of the batteries after aging; meanwhile, the method has a short aging time, improves the production efficiency, and has simple operation and high reliability.
Description
Technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for aging of lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in new energy vehicles, electric bicycles, energy storage and other fields due to the advantages of high energy density, high power density, long cycle life, and good safety. [0003] In the production process of lithium-ion batteries, an aging step is set up. This step refers to leaving the battery to stand for a period of time under a certain state of charge. It usually occurs after the battery is fully charged and formed. The purpose is to make the battery separate Some materials fully activate the reaction and reach a relatively stable state. During the aging process of lithium-ion batteries, on the one hand, the positive and negative electrode materials continue to react with the electrolyte, and the SEI film (SolidElectrolyte Interface) formed during t...
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