Lead-acid battery life, in the end is the number of years or use?

- Jun 19, 2018-

Yesterday, the circle sister sent an interactive topic in the circle of friends about whether the service life of the lead-acid battery is the number of years or the number of uses. According to everyone's feedback, the circle sister also checked some information and sorted out articles for everyone to share. There are insufficient places to welcome everyone to leave a message.

The life of a battery depends to a large extent on the environment in which the battery is used, the manufacturing process and the state of storage. If you choose to choose between two, the number of uses will determine the battery life to be more accurate.

The service life of lead-acid batteries is related to many factors and cannot be generalized. The following factors affect the service life of lead-acid batteries:

1, the depth of discharge

The depth of discharge is the extent to which discharge is stopped during use, and 100% of the depth is the discharge of full capacity. Lead-acid battery life is greatly affected by the depth of discharge. Design considerations focus on deep-cycle use, shallow-cycle use, or floating-charge use. If a shallow-cycle battery is used for deep-cycle use, the lead-acid battery will quickly fail.

Because the positive electrode active material lead dioxide itself is not firmly bonded to each other, lead sulfate is generated during discharge, and is reverted to lead dioxide when charged. The molar volume of lead sulfate is larger than that of lead oxide, and the active material volume expands during discharge. If one mole of lead oxide is converted into one mole of lead sulfate, the volume increases by 95%, so that repeated contraction and expansion cause the mutual bond between the lead dioxide particles to gradually relax and easily fall off. If only 20% of the active material of one mole of lead dioxide is discharged, the degree of shrinkage and expansion will be greatly reduced, and the binding force will be destroyed slowly. Therefore, the deeper the depth of discharge, the shorter the cycle life.

2, over charge level

A large amount of gas precipitates during overcharging. At this time, the active material of the positive electrode plate is subjected to the impact of gas. This kind of impact will promote the release of the active material. In addition, the positive electrode grid alloy is also subject to severe anodization and corrosion, so the battery will be overcharged. Reduced application deadlines.

3, the impact of temperature

Lead-acid battery life is extended with increasing temperature. For every 1°C increase between 10°C and 35°C, increase about 5-6 cycles. Between 35°C and 45°C, increase the lifetime by 25 cycles or more for every 1°C increase; Negative electrode sulfuration capacity loss reduces life.

Battery life increases with increasing temperature over a range of temperatures because the capacity increases with temperature. If the discharge capacity does not change, the depth of discharge decreases as the temperature rises, and the solid life is prolonged.

4, the effect of sulfuric acid concentration

The increase in acid density, although beneficial to the positive plate capacity, but the self-discharge of the battery increases, the corrosion of the grid is also accelerated, also contributed to the loose off of the lead dioxide, with the increase in acid density of the battery, the cycle life is reduced.

5, the impact of discharge current density

As the discharge current density increases, the life of the battery decreases, because the positive lead dioxide lead looses off under conditions of high current density and high acid concentration.


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