How long is the service life of lead-acid batteries and lithium battery packs?

As we all know, lithium battery life is limited, generally 300-500 times. Lead-acid batteries and lithium battery packs are used more and more in daily life, and people have higher and higher requirements for their service life. Therefore, it is necessary to correct one's daily battery usage method and improve the battery usage environment. Although the manufacturing technology and manufacturing process of lead-acid batteries have been improved in recent years, there are still troublesome problems in the process of continuous use. That is, the service life of lead-acid batteries always seems to be unsatisfactory. On the one hand, the service life of lead-acid batteries is not up to standard, and its service life is shortened very quickly. 1. Depth of discharge Depth of discharge refers to the extent to which the discharge starts to stop 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 the shallow-cycle battery is used for deep-cycle use, the lead-acid battery will quickly fail. 2. The degree of overcharge. 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 shedding of the active material; 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 increases with the increase of temperature. Between 10°C and 35°C, for every 1°C increase, approximately 5~6 cycles will be added, and between 35°C and 45°C, per liter A higher temperature of 1°C can prolong the life for more than 25 cycles; a temperature higher than 50°C will reduce the life due to the loss of negative electrode vulcanization capacity. UPS battery life increases with the increase of temperature within a certain temperature range because the capacity increases with the increase of temperature. If the discharge capacity remains the same, the depth of discharge decreases when the temperature increases, 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 lead-acid battery is increased, and the corrosion of the grid is also accelerated, which also promotes the loosening and shedding of lead dioxide. The increase in acid density reduces the cycle life. 5. The influence of discharge current density As the discharge current density increases, the life of lead-acid batteries decreases, because under the conditions of high current density and high acid concentration, the positive lead dioxide is promoted to loosen and fall off. The domestic single-cell 12V lead-acid battery is designed to have a floating charge life of 5-8 years, but it has been completely scrapped in 1-2 years; no matter any lead-acid battery, it cannot escape the cycle of premature scrapping in use. Generally, the recyclable life of lead-acid batteries is up to one and a half years, and lead-acid batteries of better quality can even be recycled for up to two years. But under normal circumstances, the life of lead-acid batteries begins to decline after half a year of use. Its power will gradually decrease. Generally, if it is used in a new car, the service life is about 3-4 years, and the service life is about 2 years after a replacement. There are many factors that affect the life of power lithium battery packs and their mutual use makes the performance of lithium battery packs prone to serious deterioration, especially under conditions such as high temperature and low temperature or overcharge and discharge and lack of effective management and control. Performance will further decline. In addition, the series and parallel connection of a large number of single cells makes a cell with poor capacity and performance limit the performance of the entire lithium battery pack, which in turn limits the full use of the battery pack. The inconsistency of battery cells is important in the manufacturing process. Due to the level of technology, there are slight differences in the thickness of the battery plate, the microporosity, and the activation degree of the active material. This inconsistency in the internal structure of the battery will make it impossible to completely match the voltage, capacity, internal resistance, etc. of the same type of battery manufactured in the same batch. The influence of the inconsistency of the single battery on the service life of the power lithium battery pack is divided into the inconsistency of the voltage, the inconsistency of the capacity, and the inconsistency of the internal resistance. The influence of the internal factors of the lithium battery pack 1. The side reactions of the lithium battery; 2. The irreversible consumption of the active material of the lithium battery; 3. For large lithium batteries, the battery has a large working current and slow heat dissipation, which is easy to cause damage to the battery structure; statement ：Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.