For the secondary battery (batteries, rechargeable batteries) is concerned, life cycle or life cycle is also a measure of battery performance of an important parameter. After a secondary battery charge and discharge, as a cycle, or call a cycle.

Certain discharge conditions, the battery capacity dropped to a specified value before the number of cycles the battery can withstand, as secondary batteries of cycle life, or life cycle. Life cycle of various secondary batteries, unlike the same series, the same specifications, life cycle are different.

Impact secondary battery cycle life of many factors, except for proper use and maintenance of things, the following points.

① In the charge-discharge process, the active material particles increases the effective electrode surface area decreased activity of reaction, in the same discharge current conditions, current density, electrode polarization increased, the output performance of the battery down;

② electrode active material and electrode contact resistance of the conductive frame increases, HP ProBook 4310s battery or even fall off, or transfer;

③ In the course of battery life, some of the electrode material corrosion;

④ In the cycle, the electrodes produce dendrite, causing internal short-circuit the battery;

⑤ dissolved substances such as membrane damage;

⑥ In the charge-discharge process, the active substance of crystal transformation, resulting in decreased.

Currently, the startup type of lead – acid battery has not adopted that their life cycles, instead of using the endurance capacity of over charge or cycle endurance capacity of unit number to represent.

The so-called overcharge endurance capacity, is fully charged rechargeable battery placed in temperature (40 ± 2) ℃ constant temperature water bath, with 0.1 ℃ (C rated capacity) of the constant current discharge 100h, open place after 68h. Then 〔40 ± 2) ℃ temperature with fast start-up current (> = 240s> termination of discharge to a single battery voltage 1.33V. Rapid discharge end of the experiment, the battery charging unit to complete an over. In accordance with our Ministerial standards, start-type of lead – acid battery overcharge the number of elements should be greater than 4.

The so-called cycle endurance capacity, is a fully charged battery in temperature (40 plus or minus 2) ℃ constant temperature water bath, with constant current 0.1C discharge 1h, and then immediately use the 0.1C charge current 5h, Lenovo Ideapad Y650A battery so a continuous cycle of charge discharge 36, 96h after the last open place with a quick start current discharge to 1.33V. The 36 cycles of charge, open place 96h, rapid discharge and subsequent re fully charged, the formation of a cell cycle endurance capacity. Ministerial standards in China for 3 cycles of durable unit experiments. In the last part, open 96h, in (a 18 ± 1) ℃ under the conditions to start the discharge current, discharge time should be no smaller than the 60s.