Secondary battery protecting circuit and hybrid power source equipment

1. Hybrid power source equipment, comprising:

a nonaqueous secondary battery;

a secondary battery protecting circuit connected in parallel with said secondary battery; and

a solar cell connected to said secondary battery,

said secondary battery protecting circuit including

a first voltage detecting circuit,

a second voltage detecting circuit,

a switch section, and

a heat radiating section, wherein

said first voltage detecting circuit comprises a first resistance voltage-dividing circuit connected in parallel with said secondary battery, having a temperature detecting section and including a voltage outputting portion, and a first circuit whose input portion is connected to said voltage outputting portion of said first resistance voltage-dividing circuit and which turns ON in response to a voltage in said first circuit input portion being greater than or equal to a first reference voltage value,

said second voltage detecting circuit comprises a second resistance voltage-dividing circuit connected in parallel with said secondary battery and including a voltage outputting portion, and a second circuit whose input portion is connected to said voltage outputting portion of said second resistance voltage-dividing circuit and which turns ON in response to a voltage in said second circuit input portion being greater than or equal to a second reference voltage value,

said switch section and said heat radiating section are connected in series with each other and are connected in parallel with said secondary battery,

said switch section operates in response to outputs from said first circuit and said second circuit, and

when at least one of said first circuit and said second circuit is in an ON state, said switch section is in a conduction state, and an electric power accumulated in said secondary battery is transformed into heat by said heat radiating section.

2. The hybrid power source equipment according to claim 1 , wherein either when an output voltage value from said voltage outputting portion of said first resistance voltage-dividing circuit becomes greater than or equal to the first reference voltage value depending on a temperature detected by said temperature detecting section, or when an output voltage value from said voltage outputting portion of said second resistance voltage-dividing circuit becomes greater than or equal to the second reference voltage value, at least one of said first circuit and said second circuit is in the ON state.

3. The hybrid power source equipment according to claim 1 , wherein said temperature detecting section comprises a thermistor.

4. The hybrid power source equipment according to claim 1 , wherein said heat radiating section comprises a resistor.

5. The hybrid power source equipment according to claim 1 , wherein said switch section comprises a transistor.

6. The hybrid power source equipment according to claim 1 , wherein said secondary battery comprises a lithium ion battery.