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Lithium ion battery aging method

A lithium-ion battery, battery technology, applied in the manufacture of secondary batteries, electrochemical generators, electrolyte batteries, etc., can solve the problems of affecting battery life, low production efficiency, slow interface reaction, etc., to achieve excellent cycle performance, improve production Efficiency, effect of short aging time

Active Publication Date: 2014-08-13
JIANGSU ZHIHANG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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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  • Lithium ion battery aging method

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Experimental program
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Effect test

Embodiment 1

[0026] Step 1: Perform the first stage of standing for the battery after formation, that is, stand at 40°C for 24 hours;

[0027] Step 2: Carry out the second stage of standing for the battery after the first stage of standing, that is, standing at 25°C for 72h;

[0028] Step 3: Perform the third stage of standing for the battery after the second stage of standing, that is, stand at -10°C for 48 hours, and the aging of the lithium ion battery is completed.

[0029] After aging the lithium-ion battery by this method, the following data are obtained: the internal resistance is 3.5mΩ, the first discharge capacity is 8.084Ah, the 200th discharge capacity is 7.776Ah, and the capacity retention rate at the 200th cycle is 96.2%.

Embodiment 2

[0031] Step 1: Perform the first stage of standing for the battery after formation, that is, stand at 45°C for 48 hours;

[0032] Step 2: Carry out the second stage of standing for the battery after the first stage of standing, that is, standing at 25°C for 48h:

[0033] Step 3: Perform the third stage of standing for the battery that has passed the second stage of standing, that is, standing at -10°C for 72 hours, and the aging of the lithium-ion battery is complete.

[0034] After aging the lithium-ion battery by 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 capacity retention rate at the 200th cycle is 96.1%.

Embodiment 3

[0036] Step 1: Perform the first stage of standing for the battery after formation, that is, stand at 45°C for 24 hours;

[0037] Step 2: Carry out the second stage of standing for the batteries that have passed the first stage of standing, that is, standing at 15°C for 24 hours;

[0038] Step 3: Carry out the third stage of standing for the battery after the second stage of standing, that is, standing at -20°C for 48h;

[0039] Step 4: Repeat step 1 to step 3 once until the aging of the lithium-ion battery is complete.

[0040] After aging the lithium-ion battery by 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 capacity retention rate at the 200th cycle is 96.6%.

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Abstract

The invention relates to a lithium ion battery aging method. The lithium ion battery aging method comprises the following steps: step one, standing at a first stage for an aged battery according to a first preset environment temperature and a first preset time; step two, standing at a second stage for the battery through standing at the first stage according to a second preset environment temperature and a second preset time; step three, standing at a third stage for the battery through standing at the second stage according to a third preset environment temperature and a third preset time; and step four, repeatedly carrying out the step one to the step three according to a preset cycle index until the aging of the lithium ion battery is finished. The method overcomes the defects of a conventional lithium ion battery aging method that the aging time is long and the battery performance after aging is low. The method can select batteries with low high-and-low temperature performance, so that the consistency of the batteries after being aged is ensured; meanwhile, the method is short in aging time, the production efficiency is improved, and the method is easy to operate and high in reliability.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery aging method. Background technique [0002] Lithium-ion batteries have been widely used in new energy vehicles, electric bicycles, energy storage and other fields due to their high energy density, high power density, long cycle life, and good safety. [0003] In the production and manufacturing process of lithium-ion batteries, aging steps are set. This step refers to standing the battery for a period of time under a certain state of charge. 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 (Solid Electrolyte Interface, solid electrolyte interface film) formed during the formation process on the interface between the electrode material and the electr...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 张波林道勇
Owner JIANGSU ZHIHANG NEW ENERGY
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