What will happen to the lithium-ion battery after storage long time?

What will happen to the lithium-ion battery after storage long time?

1. Physical characteristics

 In the case of high humidity, after long-term storage of lithium-ion batteries, its increase is significantly higher than that of batteries placed under low humidity. For example, the steel shell of the battery is prone to rust when the humidity is high, resulting in a slight increase in quality. Rust will not affect the internal state of the battery, but it will directly affect the shipment of the product and may have a negative impact on the electronic components that match it.

2. Electrochemical characteristics

●Capacity The long-term shelved lithium-ion battery capacity changes are mainly reflected in two points: one is the decrease in battery capacity, which is mainly caused by self-discharge; the other is the increase in irreversible capacity, which mainly depends on the irreversible consumption reaction between the internal chemical system of the battery. Self-discharge is inevitable in all lithium-ion batteries.

●Internal resistance Regarding long-term storage of lithium-ion batteries, the resistance tends to increase as the storage time increases. Exceeding a certain resistance will cause the internal battery to exceed the benchmark and be scrapped or degraded. Therefore, it is necessary to pay attention to the resistance change of the battery during long-term storage.

●Discharge characteristics After long-term storage, the discharge characteristics of lithium-ion batteries show a downward trend. The low temperature performance of batteries stored for a long time is significantly reduced.