Decrypt lithium battery aging test

At present, new energy vehicles, new energy robot and so on. All of the concepts of new power battery energy products adopt new energy lithium battery to make batteries with large capacity. What is the technical specification of lithium battery? We know that it usually adopts 18650 battery specifications.18650 is the first lithium ion batteries--Japan's SONY company make it to save cost and set a standard of lithium ion battery model. The number 18 means 18 mm in diameter, the number of 65 means 65 mm for length, while the number of 0 means for cylindrical batteries.

Common batteries are divided into 18650 lithium ion battery, Lithium iron phosphate batteries. For the nominal voltage of 3.7 v lithium ion battery voltage, charging by the voltage of 4.2V, the nominal voltage of 3.2 v lithium iron phosphate battery, charge cut-off voltage of 3.6V, the capacity is 1200 mAh - 1200 mAh, usually common capacity is 2200 mAh - 2600 mAh.

Know what is the lithium-ion battery? What is aging?

Aging is under a certain temperature and/or load to load operation of products, after a period of time or loop to check whether the performance index of the products meet the technical requirements.

Lithium battery aging generally refers to the battery assembly note liquid after the completion of the first charge into the place, can have a room temperature can also have a high temperature aging, aging effect is made after the first charge formation of the SEI film properties and composition can be stable. Room temperature ageing temperature is 25 degrees, high temperature aging GeChang is different, have a plenty of 38 degrees, 45 degrees, the time between 48-72 hours.

Aging and separate mouth sealed aging and aging two cases:

For opening for the aging of cells, for the normal temperature aging if relative humidity can be controlled under 2%, aging after sealing is better,

For high temperature aging, aging is better after sealing.

But what is certain is that the aging process with electrochemical dynamics of change, is of great help to the stability of the SEI, can promote the electrochemical stability of the 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, such as leakage happens even situation are likely

After high temperature aging of battery performance is more stable, the vast majority of lithium-ion battery manufacturers took in the process of high temperature ageing operating mode, 45 ~ 50 degrees Celsius temperature aging 1 ~ 3 days, then the normal temperature. After high temperature aging cell potential adverse phenomenon will be exposed, such as voltage, thickness, internal resistance changes are directly test this batch of battery safety and electrochemical performance of comprehensive indicators.

High temperature aging aims to shorten the whole production cycle of the battery, the formation battery only accelerate the chemical reaction at high temperatures. It does not have benefits but damage to the battery. It is better to store the battery at room temperature for more than three weeks to make balanced chemical reaction on positive pole, negative pole, diaphragm and sufficient. The battery performance at that time is more reliable.

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