SoH, SoC Estimation and Self Discharge - I — Lesson 7

This lesson covers the crucial concepts related to the use of batteries in electric vehicles. It delves into the understanding of the state of health (SOH) and state of charge (SOC) of a battery. The lesson explains how to estimate the SOH and SOC of a battery, which are vital for designing and using batteries in electric vehicles. It also discusses the concept of self-discharge. The lesson further explains how the open circuit voltage of a battery, such as a lead-acid battery, is a function of its state of charge. It also highlights how the state of charge of a battery can vary depending on the current and the internal resistance of the battery. The lesson also discusses the implications of fast charging and discharging on the life of a battery.

Video Highlights

00:17 - Introduction
00:45 - How to estimate the state of health and state of charge of a battery
01:12 - State of charge (SoC)
02:18 - Discussion on how state of charge is linearly proportional to open circuit voltage in a lead acid battery
06:47 - Explanation of the concept of constant current charging and constant voltage charging
14:37 - Discussion on the implications of state of charge on battery life and performance

Key Takeaways

- The state of charge (SOC) of a battery is a percentage of the total charge available at any particular time.
- The open circuit voltage of a battery is a function of its state of charge.
- Fast charging and discharging can impact the life of a battery.
- The state of charge is not a linear function of voltage, and the actual SOC is always the open circuit SOC.