Views: 21 Author: Site Editor Publish Time: 2023-11-20 Origin: Site
When you are choosing to buy lithium-ion solar batteries, you will often come across the terminology about lithium battery throughput inside the supplier's warranty commitment. Maybe this concept is a little strange for you who just contact with lithium battery, but for professional solar battery manufacturer BSLBATT, this is one of the lithium battery terminology that we often as well, so today I will explain what is lithium battery throughput and how to calculate.
Lithium battery throughput is the total energy that can be charged and discharged during the entire life of the battery, which is a key performance indicator reflecting the durability and life of the battery. The design of the lithium battery, the quality of the materials used, the operating conditions (temperature, charge/discharge rate) and the management system all play a vital role and influence on the throughput of the lithium battery. The term is often used in the context of cycle life, which refers to the number of charge/discharge cycles a battery can undergo before its capacity drops significantly.
Higher throughput typically indicates a longer battery life, as it means that the battery can withstand more charge/discharge cycles without significant capacity loss. Manufacturers often specify the expected cycle life and throughput of a battery to give the user an idea of how long the battery will last under normal operating conditions.
The throughput of a lithium battery can be calculated using the following formula:
Throughput (Ampere-hour or Watt-hour) = Battery capacity × Number of cycles × Depth of discharge × Cycle efficiency
According to the above formula, it can be seen that the total throughput of a lithium battery is mainly affected by its number of cycles and depth of discharge. Let's analyze the components of this formula:
Number of Cycles:
This represents the total number of charge/discharge cycles that a Li-ion battery can undergo before its capacity drops significantly. During the use of the battery, the number of cycles will change according to different environmental conditions (e.g. temperature, humidity), usage patterns and operating habits, thus making the throughput of the lithium battery a dynamically changing value.
For example, if the battery is rated for 1000 cycles, then the number of cycles in the formula is 1000.
This is the total amount of energy a battery can store, usually measured in Ampere-hours (Ah) or Watt-hours (Wh).
Depth of Discharge:
The depth of discharge of a lithium-ion battery is the degree to which the battery's stored energy is utilized or discharged during a cycle. It is usually expressed as a percentage of the total battery capacity. In other words, it indicates how much of the battery's available energy is used before it is recharged. Lithium batteries are usually discharged to a depth of 80-90%.
For example, if a lithium-ion battery with a capacity of 100 amp-hours is discharged to 50 amp-hours, the depth of discharge will be 50% because half of the battery's capacity has been used.
Lithium-ion batteries lose a small amount of energy during the charge/discharge cycle. Cycle efficiency is the ratio of the energy output during discharge to the energy input during charging. The cycle efficiency (η) can be calculated by the following formula: η = energy output during discharge/energy input during charge × 100
In reality, no battery is 100% efficient, and there are losses in both the charging and discharging processes. These losses can be attributed to heat, internal resistance, and other inefficiencies in the battery's internal electrochemical processes.
Now, let's take an example:
Let's say you have a 10kWh BSLBATT solar wall battery, we set the depth of discharge at 80%, and the battery has a cycling efficiency of 95%, and using one charge/discharge cycle per day as the standard, that's a minimum of 3,650 cycles within the 10 year warranty.
Throughput = 3650 cycles x 10kWh x 80% DOD x 95% = 27.740 MWh
So, in this example, the throughput of the lithium solar battery is 27.740 MWh. this means that the battery will provide a total of 27.740 MWh of energy through charging and discharging cycles over its lifetime.
The higher the throughput value for the same battery capacity, the longer the life of the battery, making it a durable and reliable choice for applications such as solar storage. This calculation provides a concrete measure of a battery's durability and longevity, helping to provide a comprehensive understanding of the battery's performance characteristics. The throughput of a lithium battery is also one of the reference conditions for the battery warranty.