The invention provides a
thermal battery pack with single batteries activated sequentially and outputted parallelly. The
thermal battery pack comprises a plurality of single thermal batteries, a structural shell and a sequential activation
control circuit, wherein the single thermal batteries in all grades are sequentially activated under control of the sequential activation
control circuit and are outputted parallelly. The number of the single thermal batteries depends on service hours of both a power
system and the single thermal batteries. Output terminals of the single thermal batteries are in parallel connection through
rectifier diodes, and activation terminals are connected to activation
signal output ends corresponding to the
control circuit. After being activated by external activation signals, the first-stage single thermal batteries
control power-on operation of the circuit and start external output of the power
system while judge output
voltage or start a
delay time sequence, and activation signals of second-stage single thermal batteries are outputted if power
voltage is lower than a threshold value or
delay time is up. This process is repeated until
discharge of the last-stage single thermal batteries is completed.