SLUAAH5 November   2022 BQ25171-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
  4. 2 Li-Ion Overview
  5. 3 Li-Ion Applications
  6. 4 LiFePO4 Overview
  7. 5 LiFePO4 Applications
  8. 6 NiMH Overview
  9. 7 NiMH Applications
  10. 8 Super Capacitors
  11. 9 Super Capacitor Applications
  12. 10Summary
  13. 11References

2 Li-Ion Overview

The Li-ion battery is widely used in portable applications for the high energy density vs. weight. Single cell voltage range is typically 3.0 V to 4.2 V which is high enough to reduce the need for a boost converter. The cell has a long life at 500 cycles before capacity drops by 80%.

The Li-Ion cells are sensitive to overcharge, discharge, high currents, overheating and other conditions. To provide safe operation, a protection circuit module (PCM) is required which increases the battery pack cost.

Due to risk of overheating and thermal run away, a number of shipping restrictions and safety requirements apply to the cells transport.

While 18650 size is well known, flat pouch form factor is also widely available to provide better physical fit to the mechanical design.



Figure 2-1 Typical Li-Ion Battery Charging Profile CC-CV