What are the factors related to the service life of lead-acid batteries?

The service life of lead-acid batteries is related to many factors, which cannot be generalized. The following factors affect the service life of lead-acid batteries: 1. Depth of discharge Depth of discharge is the extent to which discharge starts to stop during use. 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 considerations is 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 it is restored 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. The mole of lead oxide is converted into one mole of lead sulfate, and the volume is increased by 95%. In this way, repeated shrinkage and expansion will gradually loosen the mutual bond between the lead dioxide particles and easily fall off. If the active material of one mole of lead dioxide is only 20 % Discharge, the degree of contraction and expansion is greatly reduced, and the destruction of the binding force becomes slower. Therefore, the deeper the depth of discharge, the shorter the cycle life. 2. The degree of overcharge When overcharged, a large amount of gas is precipitated, and the positive plate is active at this time The material is subject to the impact of gas, and this impact will promote the shedding of the active material; in addition, the positive grid alloy is also subject to severe anodic oxidation and corrosion, so the application period will be shortened when the battery is overcharged. 3. Temperature affects the life of lead-acid batteries. Extends with the increase of temperature. Between 10℃~35℃, for every 1℃ increase, approximately 5~6 cycles will be added, and between 35℃~45℃, the life can be extended by 25 cycles for every 1℃ increase Above; if the temperature is higher than 50℃, the life will be reduced due to the loss of vulcanization capacity of the negative electrode. The life of the battery increases with the increase of temperature within a certain temperature range, because the capacity increases with the increase of temperature. If the discharge capacity does not change, then When the temperature rises, the depth of discharge decreases and the solid life is prolonged. 4. The influence of sulfuric acid concentration increases the acid density, although it 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 loose and shedding of lead dioxide will decrease the cycle life with the increase of the acid density used in the battery. 5. The influence of the discharge current density As the discharge current density increases, the life of the battery decreases because of the high current density and high acid density. Under the condition of concentration, the positive lead dioxide is caused to fall off loosely. Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: What are the differences between lithium batteries and nickel-metal hydride batteries?