What are the factors that affect the life of lead-acid batteries?

Factors affecting the life of lead-acid batteries The failure of lead-acid batteries is the result of a combination of many factors, which are determined by the internal factors of the plate, such as the composition of the active material, crystal type, porosity, plate size, grid material and structure, etc. , Also depends on a series of external factors, such as discharge current density, electrolyte concentration and temperature, depth of discharge, maintenance status and storage time. Here is an analysis of important external factors. 1. Depth of discharge. The depth of discharge is the extent to which the discharge starts and stops during use. 100% depth means to release the full capacity. 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 electrode active material lead dioxide itself is not well-bound, 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 dioxide, and the volume of the active material expands during discharge. If 1 mole of lead dioxide is converted to 1 mole of lead sulfate, the volume increases by 95%. Such repeated contraction and expansion will gradually loosen the mutual bond between the lead dioxide particles and easily fall off. If only 20% of the active material of 1 mole of lead dioxide is discharged, the degree of shrinkage 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. The degree of overcharge. A large amount of gas is precipitated during overcharging. At this time, the active material of the positive plate is impacted by the gas. This impact will promote the active material to fall off. In addition, the positive electrode grid alloy is also subject to severe anodic oxidation and corrosion, so the battery will cause damage when overcharged. The application period is shortened. 3. The influence of temperature. The life of lead-acid batteries increases with increasing temperature. Between 10-35℃, for every 1℃ increase, about 5-6 new cycles are added; between 35-45℃, every 1℃ increase can prolong the life by more than 25 cycles; above 50℃, the negative electrode The vulcanization capacity is lost and life is reduced. The battery life increases with increasing temperature within a certain temperature range because the capacity increases with increasing temperature. If the discharge capacity remains unchanged, the depth of discharge decreases when the temperature rises, and the solid life is extended. 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 article: What are the differences between lithium batteries and polymer batteries?