Battery capacity modification

What is battery capacity estimation?

Battery capacity estimation is one of the key functions in the BMS, and battery capacity indicates the maximum storage capability of a battery which is essential for the battery State-of-Charge (SOC) estimation and lifespan management.

What is battery capacity?

In essence, the battery capacity is the number and energy of the electrons inside the electrodes [14, 15]. One consensus is that the Li-ion battery capacity will fade with battery degradation, which could be influenced by numerous external factors in operation conditions.

How have battery capacity prediction models changed over time?

The evolution of battery capacity prediction models has been significantly influenced by advanced signal processing and feature extraction methods. These techniques allow researchers to distil meaningful information from raw battery data, enhancing the accuracy of capacity and state-of-health (SOH) predictions.

Why is battery capacity important in BMS?

However, the capacity of an Li-ion battery is critical for the energy management decision marking of BMS. For example, the battery State of Charge (SOC) represents current energy left, which is a ratio of the present Ah amount to its capacity .

Why is battery capacity important?

Battery capacity is usually regarded as the indicator of its lifespan, and it is believed to reach its EOL once the battery capacity reaches 80% of its initial value . An accurate capacity can improve the accuracy of SOC estimation, thus enabling the users to perform charging operations and battery maintenance prompt.

What happens if Li-ion battery capacity is changed?

A slightly changed capacity will gradual deteriorate the battery’s electrical and thermal characteristics and further lead to other severe safety issues . However, a series of barriers hinder an accurately measurement of the Li-ion battery’s capacity.