Lithium battery packs and lead-acid batteries are often compared, especially in UPS applications. Mainly because lithium battery packs and lead-acid batteries are now the most commonly used storage energy batteries on UPS.
Among them, lead acid battery is from the UPS appeared to use the energy storage battery so far, and lithium battery pack is a rapidly developing in recent years compared to lead-acid batteries have more advantages of energy storage batteries.
Lithium battery ups has many advantages over lead-acid ups, among which the difference between the charge and discharge efficiency of lithium battery packs and lead-acid batteries is also a big contrast.
Comparison of charging and discharging efficiency of lithium battery pack and lead acid battery
When the lithium-ion battery is discharged, its operating voltage always changes with the continuation of time, using the battery's operating voltage to do the longitudinal coordinates, discharge time, or capacity, or charge State (SOC), or charging and discharging depth (DOD) to do the horizontal coordinates, drawn curves called charging and discharging curves. Depending on the charging and discharging curve, it is possible to determine whether the battery's performance is stable and the maximum current allowed by the battery while it is working stably.
The following two diagrams are lead-acid batteries and lithium-ion battery packs charging and discharging curves, from the graph can be intuitively obtained the charging and discharging efficiency of the two, which battery efficiency is higher, we can also judge.
For the same fully charged lead-acid battery, at the same temperature, using different magnification of the discharge current, its discharge output characteristics are very different, resulting in unstable power.
Lead acid battery charging and discharging curve
For the same fully discharged lithium battery pack, at the same temperature, using different magnification of the discharge current, its discharge output characteristics are very stable, compared with lead-acid batteries charging and discharging efficiency is much higher.
Lithium battery pack charging and discharging curve
In addition to charge and discharge efficiency, lithium battery packs have advantages over lead-acid batteries, and in other ways, lithium battery packs also have many advantages.
Comparison of other aspects of lithium battery packs and lead-acid batteries
Volumetric weight
Under the same volume, the volume and weight of lithium battery packs are one-third of lead acid, which can effectively save installation space, more conducive to space planning, easy centralized management, reduce operation and maintenance costs.
Material composition
Lithium battery packs are generally the use of lithium alloy metal oxides as cathode materials, graphite as cathode materials, the use of non-hydroelectric electrolyte batteries.
Lead acid battery is a kind of electrode mainly made of lead and its oxides. The electrolyte is a battery of sulfuric acid solution.
Lithium battery pack composition of the material compared to lead-acid batteries in the safety and environmental protection has a great advantage, if the lithium battery pack leakage, the leaking liquid will not pose a greater threat to the staff and the surrounding environment.
Since the main thrust of this paper is to analyze the comparison of charge and discharge efficiency between lithium battery packs and lead-acid batteries, some comparisons between lithium battery packs and lead-acid batteries in other areas are not mentioned much.
From the above lithium battery pack and lead-acid battery charging and discharging curve, we can see that lithium battery package compared to lead-acid battery, discharge output characteristics to be much more stable, charge and discharge overall efficiency is much higher. Analysis of charging and discharging efficiency of lithium battery pack and lead acid battery
