Apparatus for monitoring the voltage of a battery pack having a plurality of battery cells connected in series
View Patent ↗A battery voltage monitoring apparatus to monitor a voltage of an assembled battery having a plurality of battery cells, the battery voltage monitoring apparatus comprises a first voltage sensor module having a voltage sensor and a first and a second module terminals connected to the voltage sensor, a second voltage sensor module having a voltage sensor different from the voltage sensor included in the first voltage sensor module and a third module terminal connected to the voltage sensor, a first terminal connected to the first and the third module terminals, a second terminal connected to the second module terminal, and a voltage clamp circuit to clamp a voltage between the first and the second terminals disposed between the first and the second terminals.
1. A battery voltage monitoring apparatus to monitor a voltage of an assembled battery having a plurality of battery cells, the battery voltage monitoring apparatus comprising:
a first voltage sensor module having a first voltage sensor, a first and a second module terminals connected to the first voltage sensor;
a second voltage sensor module having a second voltage sensor different from the first voltage sensor included in the first voltage sensor module and a third module terminal connected to the second voltage sensor;
a first terminal connected to the first and the third module terminals;
a second terminal connected to the second module terminal; and
a voltage clamp circuit to clamp a voltage between the first and the second terminals disposed between the first and the second terminals.
2. The battery monitoring apparatus according to claim 1 , wherein the voltage clamp circuit is a Zener diode.
3. The battery voltage monitoring apparatus according to claim 1 , wherein the first module terminal is connected to a high potential power supply terminal of the first voltage sensor module, and the third module terminal is a low potential power supply terminal of the second voltage sensor module.
4. The battery voltage monitoring apparatus according to claim 2 , wherein the first module terminal is connected to the high potential power supply terminal of the first voltage sensor module, and the third module terminal is a low potential power supply terminal of the second voltage sensor module.
5. The battery voltage monitoring apparatus according to claim 1 , wherein the first module terminal is a low potential power supply terminal of the first voltage sensor module, and the third module terminal is connected to a high potential power supply terminal of the second voltage sensor module.
6. The battery voltage monitoring apparatus according to claim 2 , wherein the first module terminal is a low potential power supply terminal of the first voltage sensor module, and the third module terminal is connected to a high potential power supply terminal of the second voltage sensor module.
7. The battery voltage monitoring apparatus according to claim 1 , wherein the second terminal is supplied with a potential, the potential being different from the first terminal by one phase of the battery cell.
8. The battery voltage monitoring apparatus according to claim 1 , wherein the first terminal is connected to a low potential power supply terminal of the first voltage sensor module, and the second module terminal is a low potential power supply terminal of the second voltage sensor module.
9. The battery voltage monitoring apparatus according to claim 2 , wherein the first terminal is connected to a low power supply terminal of the first voltage sensor module, and the second terminal is connected to a high potential power supply terminal of the first voltage sensor module.
10. The battery voltage monitoring apparatus according to claim 1 , wherein the first module terminal is connected to the high potential power supply terminal of the first voltage sensor module, and the second module terminal is a low potential power supply terminal of the first voltage sensor module.
11. The battery voltage monitoring apparatus according to claim 2 , wherein the first module terminal is connected to the high potential power supply terminal of the first voltage sensor module, and the second module terminal is a low potential power supply terminal of the first voltage sensor module.
12. The battery voltage monitoring apparatus according to claim 1 , wherein at least one of the first and second voltage sensor modules comprising:
a plurality of input terminals; and a current source connected to the plurality of input terminals.
13. The battery voltage monitoring apparatus according to claim 8 , wherein at least one of the first and second voltage sensor modules comprising:
a current source to pass a current from a high potential power supply terminal to a low potential power supply terminal of the voltage sensor module; and
a switch to control a conductive condition of a current from the current source.