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Why does the lithium battery in the battery sorter have to do the aging test and the aging test?

2019-11-08
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At present, new energy vehicles, new energy robots...The power battery of all products of new energy concept USES the lithium battery cell of new energy to compose large capacity lithium battery, so what is the technical specification of these lithium battery?We know that battery sorters generally use the 18650 battery specification.The 18650 is the ancestor of lithium-ion batteries -- a standard lithium-ion battery model developed by SONY in order to save costs. Among them, 18 means 18mm in diameter, 65 means 65mm in length, and 0 means cylindrical battery.

Common 18650 battery is divided into lithium ion battery, lithium iron phosphate battery.Lithium ion battery voltage is nominal voltage 3.7v, charging cut-off voltage 4.2v, lithium iron phosphate battery nominal voltage 3.2v, charging cut-off voltage 3.6v, capacity is usually 1200mAh-3000mAh, common capacity is 2200mAh-2600mAh.

The lithium battery in the battery sorter knows what it is, so what is aging?

Aging is to load and run the product under a certain temperature and/or load, and then check whether the performance index of the product meets the technical requirements after a period of time or a cycle.

Aging of lithium battery generally refers to the placement of battery after the first charging after the completion of battery assembly liquid injection. There can be room temperature aging or high temperature aging, which can stabilize the SEI properties and composition formed after the initial charging.Normal temperature aging temperature is 25 degrees, high temperature aging plant is different, some 38 degrees also have 45 degrees, time between 48-72 hours.

Aging is divided into mouth aging and sealing aging:

For batteries with open aging, it is better to seal them after aging if the relative humidity can be controlled below 2% for normal temperature aging.

For high temperature aging, aging after sealing is better.

However, it is certain that there are electrochemical dynamics changes in the aging process, which are of great help to the stability of SEI and promote the stability of the electrochemical system.

For lithium battery, the aging principle and purpose of the electrolyte in order to fully infiltrates, another is the live is the cathode material of some active ingredients through certain deactivation reaction, make the whole battery performance more stable performance, many companies in order to make this process faster, to adopt high temperature aging, high temperature aging need to pay attention to control the time and temperature, however, because of the high temperature aging can produce more than the normal temperature aging to living substances of degradation effect, good control, active ingredients fully reflect, battery features stable performance, control is not good,, so electrical performance degradation, low capacity, the increasing of IR,Even the occurrence of leakage and other conditions are very likely

After high temperature aging battery performance is more stable, the vast majority of lithium ion battery manufacturers in the production process are adopted high temperature aging operation mode, the temperature of 45~50 degrees Celsius aging 1~3 days, and then room temperature use.After high temperature aging of the battery potential adverse phenomena will be exposed: such as voltage changes, thickness changes, changes in internal resistance are direct test of the safety and electrochemical performance of the battery comprehensive indicators.

High temperature aging just in order to shorten the battery the whole production cycle, players into the battery only at high temperatures accelerate the chemical reaction, the battery is not more than the benefits of possible damage to the battery, often under the temperature incubation time in more than three weeks, let is negative, the diaphragm, sufficient for chemical reactions such as electrolyte balance, then the battery performance is more real.



Why does the lithium battery in the battery sorter have to do the aging test and the aging test?

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