The role of the battery pack is to store the energy emitted by the solar array while it is illuminated and to supply power to the load at any time. The basic requirements of the solar cell power generation system for the battery pack used are:
1 self-discharge rate is low;
2 long service life;
3 deep discharge capacity;
4 high charging efficiency;
5 less maintenance or maintenance-free;
6 working temperature range is wide;
7 low price.