Advantages of Lithium Ion UPS Systems
Lithium ion batteries offer several times the energy and power density of the most common types in current UPS systems compared to lead-acid batteries. Their energy density is up to 200Wh/kg, which is three times as much as nickel metal hydride and four times of that of lead acid. As a result, UPSs built with lithium ion batteries take up only about one-third or less of the space of lead-acid-based solutions that provide the same power. This smaller footprint means lower cooling requirements, at least about two-thirds less weight. This means that customers have more flexibility in where the system is installed, and can often avoid costly building renovations. Lithium ion batteries can also withstand a wider temperature range than lead acid batteries. As a rule of thumb, every 10°C (18°F) increase in ambient temperature over 25°C (77°F) cuts the life of a lead acid battery in half. When used at low discharge rates, lithium ion batteries are much less sensitive to temperature fluctuations and can accept temperature spikes with little to no impact on battery life. For very short run times and high discharge rates, such as in UPS applications, lithium ions are still temperatur...
Multi-series Lithium Ion Battery Pack Equalization
In today market, there are two balancing methods for a multi-series lithium ion battery pack, including traditional passive balancing and automatic balancing. There is some controversy about whether the battery management circuit should have a balancer function. Here are some shares about it. If the production and storage time of a lithium ion battery pack composed of multiple series cells is relatively long, due to the different static power consumption of the management circuit and the different self-discharge rate of each cell, the voltage of each string of the battery pack will be inconsistent, and there will be a significant voltage difference. In order to ensure the consistency of capacity, the equalization circuit has a balanced cell voltage effect on the battery pack, and realizes full charge and complete discharge of the battery pack to maximize its effect. Many people believe that the equalization circuit works only when a lithium ion battery pack is used to the middle and late stages. In fact when the battery pack is used to the middle and late stages, the capacity difference due to the different capacity loss of each cell can not be compensated by the e...
Analysis About The Lithium Ion Battery Life
Lithium ion batteries will experience a decline in service life and become increasingly less durable during use, which is actually related to the battery cycle life and safety. Cycle life refers to the available capacity of a battery. If a battery is not durable, it means that its storage capacity is decreasing. The reason for this is that the activated lithium ions in the battery are blocked, making it impossible to charge and discharge. The safety issues of lithium ion batteries are caused by internal thermal runaway, overcharging and over discharging of the battery, as well as compression and puncture of the battery, resulting in short circuits, which can cause combustion or explosion of the battery. Defective coatings or folded electrodes on lithium ion batteries can pose a risk of affecting the life of lithium ion batteries, so battery protection must be in place. In addition to the activation of the protection mechanism by the battery protection board, the selection and manufacture of the battery module is also crucial. How to improve the life of lithium ion batteries? The ratio of cathode and anode materials of lithium ion batteries should be reasonabl...