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Aging test for lithium-ion batteries

Nowadays, all new energy concept products such as new energy vehicles and new energy robots use new energy lithium-ion battery cells to form high-capacity lithium-ion batteries. So, what are the technical specifications for these lithium-ion batteries? We understand that battery separators typically use 18650 battery sizes. 18650 is a standard lithium-ion battery type introduced by Sony Corporation in Japan to save costs, where 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery.

Ordinary 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion batteries is 3.7V, with a charging cut-off voltage of 4.2V. The nominal voltage of iron phosphate lithium-ion batteries is 3.2V, with a charging cut-off voltage of 3.6V. The general capacity is 1200mAh-3000mAh, and the general capacity is 2200mAh-2600mAh.

What is the lithium-ion battery in the battery separator and what is aging?

Aging is the process of loading and operating a product at a certain temperature and/or load, and after a period of time or a cycle, determining whether the product's functional goals are satisfactory.

The aging of lithium-ion batteries generally refers to the process of placing and assembling the battery for the first time before injecting liquid, which can be either room temperature aging or high temperature aging. Its purpose is to stabilize the properties and composition of the SEI film formed after the initial charge. The room temperature aging temperature is 25 degrees, and the high-temperature aging of different plants varies from 38 degrees to 45 degrees, with a time range of 48 to 72 hours.

Aging and aging of partitions and seals:

Regarding battery aging at room temperature, if the relative humidity can be controlled below 2%, it is best to seal it after aging,

Regarding high-temperature aging, the sealing aging effect is better.

However, it can be confirmed that there are electrochemical dynamic changes during the aging process, which greatly contribute to the stability of SEI and promote the stability of the electrochemical system.

Regarding lithium-ion batteries, the principle and purpose of aging is that the electrolyte needs to be fully moisturized, and the other is that the cathode material used in daily life contains active ingredients that must be deactivated in response, making the overall function of the battery safer. Many companies use high-temperature aging to make this process faster, but high-temperature aging requires attention to controlling time and temperature. Due to the fact that high-temperature aging can produce living substances that age beyond normal temperature, the degradation effect of control is good, and the effective ingredients fully reflect the safety characteristics of the battery. Poor control and excessive reaction can lead to a decrease in electrical function, reduced capacity, the addition of infrared radiation, and even possible leakage and other conditions

After high-temperature aging, the battery function becomes more stable. In the production process of most lithium-ion battery manufacturers, high-temperature aging is adopted. Aging at a temperature of 45-50c for 1-3 days, then leaving at room temperature. After high-temperature aging of batteries, potential adverse phenomena such as voltage changes, thickness changes, and internal resistance changes are directly tested for battery safety and electrochemical performance.

In order to shorten the entire production cycle of batteries, high-temperature aging only allows players to enter batteries that accelerate chemical reactions at high temperatures. The benefits of batteries may not exceed the damage they bring, and it is best to incubate at room temperature for more than three weeks. We are negative, and the gap and electrolyte balance meet the chemical reaction, such as when the battery is just the truth.

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