Is the service life of lead-acid batteries the number of years or the number of uses?

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. Depth of discharge Depth of discharge refers to the extent to which discharge starts and stops during use, and 100% depth refers to the full capacity of discharge. The life of lead-acid batteries is greatly affected by the depth of discharge. The focus of design consideration is deep cycle use, shallow cycle use or floating charge use. If the shallow-cycle battery is used for deep-cycle use, the lead-acid battery will quickly fail. Because the positive active material lead dioxide itself is not well-bonded with each other, lead sulfate is generated during discharge, and returns to lead dioxide during charging. The molar volume of lead sulfate is larger than that of lead oxide, and the volume of the active material 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 shrinkage and expansion will gradually loosen the bond between the lead dioxide particles and easily fall off. If only 20% of the active material of one mole of lead dioxide is discharged, the degree of contraction and expansion will be greatly reduced, and the destruction of the binding force will become slower. Therefore, the deeper the discharge depth, the shorter the cycle life. 2. Overcharge level A large amount of gas is released during overcharge. At this time, the active material of the positive plate is impacted by the gas, and this impact will promote the active material to fall off; in addition, the positive grid alloy is also subject to severe anodic oxidation and corrosion, so the battery Overcharging will shorten the application period. 3. The influence of temperature The life of lead-acid batteries is prolonged with the increase of temperature. Between 10°C and 35°C, for every 1°C increase, approximately 5~6 cycles increase. Between 35°C and 45°C, each 1°C increase can prolong life by more than 25 cycles; higher than 50°C is due to The vulcanization capacity of the negative electrode is lost and the life is reduced. Battery life increases with increasing temperature within a certain temperature range because the capacity increases with increasing temperature. If the discharge capacity does not change, the depth of discharge decreases when the temperature rises, and the solid life is prolonged. 4. The influence of sulfuric acid concentration The increase in acid density is beneficial to the capacity of the positive plate, but the self-discharge of the battery increases, and the corrosion of the grid also accelerates, which also promotes the loosening of lead dioxide. With the increase of the acid density in the battery , The cycle life is reduced. 5. The influence of the discharge current density As the discharge current density increases, the battery life decreases, because under the conditions of high current density and high acid concentration, the positive lead dioxide is promoted to loosen and fall off. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Will lead-acid batteries explode?