What factors will affect the life of lead-acid batteries?

The depth of discharge refers to the extent to which the discharge starts and stops during use. 100% depth refers to the full capacity of the 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 When a 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 firmly bonded to each other, lead sulfate is generated during discharge, and it 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 to one mole of lead sulfate, the volume increases by 95%. In this way, repeated shrinkage and expansion will make the lead dioxide particles The bonding between each other gradually relaxes and is easy to 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 cycle life The shorter. 2, the degree of overcharge A large amount of gas is released during overcharge, and the active material of the positive plate is subjected to the impact of the gas, and this impact will promote the shedding of the active material; in addition, the positive electrode grid alloy is also subject to severe anodic oxidation and corrosion , So the application period will be shortened when the battery is overcharged. 3. The influence of temperature The life of lead-acid batteries will increase with the increase of temperature. Between 10℃ and 35℃, for every 1℃ increase, approximately 5~6 cycles will be added Between 35°C and 45°C, each increase of 1°C can extend the life by more than 25 cycles; above 50°C, the life will be reduced due to the loss of vulcanization capacity of the negative electrode. The battery life will increase with the temperature within a certain temperature range. The increase is because the capacity increases with the increase in temperature. If the discharge capacity does not change, the depth of discharge decreases when the temperature increases, and the solid life is prolonged. 4. The influence of the concentration of sulfuric acid increases the acid density, although it has a positive effect on the positive electrode. The board capacity is favorable, but the self-discharge of the battery increases and the corrosion of the grid accelerates, which also promotes the loosening of lead dioxide. With the increase of the acid density used in the battery, the cycle life decreases. Disclaimer: Article published on this site Some pictures and content are from the Internet. If there is any infringement, please contact to delete the previous article: What are the precautions for installing the lithium battery pack?