Voltage monitoring module and voltage monitoring system to detect a current leakage

Patent metadata

Field	Value
Publication number	US-10895603-B2
Application number	US-201815937360-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Mar 31, 2011
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A voltage monitoring module including a first input terminal coupled to a high-voltage-side terminal of a battery cell through a first path including an external resistor, a first terminal coupled to the high-voltage-side terminal of the battery cell through a second path; a first switch coupled to the first input terminal, a second switch coupled to the first terminal; a second input terminal and a second terminal coupled to a low-voltage-side terminal of the battery cell, a third switch that is coupled to the second input terminal; a fourth switch that is coupled to the second terminal, and a control circuit that controls ON/OFF of the first through fourth switches, wherein an element that suppresses fluctuation of a voltage input to the first switch through the first input terminal that is coupled between the first switch and a fixed voltage.

First claim

The invention claimed is:

1. A battery management device comprising:
a first terminal configured to detect a voltage of a first external electrode of a battery cell via a first path;
a second terminal configured to detect a voltage of a second external electrode of the battery cell via a second path;
a third terminal configured to couple with the first external electrode via a third path;
a fourth terminal configured to couple with the second external electrode via a fourth path;
a transistor configured to short-circuit the second terminal and the third terminal; and
a voltage measurement circuit configured to detect:
a first potential difference between the first path and the second path; and
a second potential difference between the third path and the fourth path, wherein

the battery management device is configured to detect a current leakage among the first path, the second path, the third path, and the fourth path by comparing the first potential difference and the second potential difference.

2. The battery management device according to claim 1 , wherein the voltage measurement circuit comprises:
a voltage detection circuit configured to detect a potential difference between a first node and a second node, and
a routing circuit configured to couple the first path or the third path with the first node, and configured to couple the second path or the fourth path with the second node.

3. The battery management device according to claim 1 , wherein the first path includes a filter circuit.

4. The battery management device according to claim 1 , wherein the first path includes a voltage protection circuit.

5. The battery management device according to claim 1 ,
wherein the first external electrode is a positive electrode of the battery cell, and
wherein the second external electrode is a negative electrode of the battery cell.

6. The battery management device according to claim 5 ,
wherein the third path includes a resistor, and
wherein the battery management device is configured to discharge a charge of the battery cell via the third path and the second path through the transistor.

7. A battery management device comprising:
a first terminal configured to detect a voltage of a first external electrode of a battery cell via a first path;
a second terminal configured to detect a voltage of a second external electrode of the battery cell via a second path;
a third terminal configured to couple with the first external electrode via a third path;
a fourth terminal configured to couple with the second external electrode via a fourth path;
a first transistor, a second transistor, a third transistor, and a fourth transistor respectively coupled to the first terminal, the second terminal, the third terminal and the fourth terminal, the second transistor configured to short-circuit the second terminal and the third terminal;
a voltage measurement circuit configured to detect:
a first potential difference between the first path and the second path; and
a second potential difference between the third path and the fourth path; and

a control circuit configured to detect a current leakage among the first path, the second path, the third path, and the fourth paths by comparing the first potential difference and the second potential difference.

8. The battery management device according to claim 7 , wherein the voltage measurement circuit comprises:
a voltage detection circuit configured to detect a potential difference between a first node and a second node, and
a routing circuit configured to couple the first path or the third path with the first node, and configured to couple the second path or the fourth path with the second node.

9. The battery management device according to claim 7 , wherein the first path includes a filter circuit.

10. The battery management device according to claim 7 , wherein the first path includes a voltage protection circuit.

11. The battery management device according to claim 7 ,
wherein the first external electrode is a positive electrode of the battery cell, and
wherein the second external electrode is a negative electrode of the battery cell.

12. The battery management device according to claim 11 ,
wherein the third path includes a resistor, and
wherein the control circuit is configured to discharge a charge of the battery cell via the third path and the second path through the transistor.

13. A battery control device comprising:
a first terminal configured to detect a voltage of a first external electrode of a battery cell via a first path;
a second terminal configured to detect a voltage of a second external electrode of the battery cell via a second path;
a third terminal configured to couple with the first external electrode via a third path;
a fourth terminal configured to couple with the second external electrode via a fourth path;
a transistor configured to short-circuit the second terminal and the third terminal;
a voltage measurement circuit configured to detect:
a first potential difference between the first path and the second path; and
a second potential difference between the third path and the fourth path; and

a control circuit configured to detect a current leakage among the first path, the second path, the third path, and the fourth paths by comparing the first potential difference and the second potential difference.

14. The battery control device according to claim 13 ,
wherein the voltage measurement circuit comprises:
a voltage detection circuit configured to detect a potential difference between a first node and a second node, and
a routing circuit configured to couple the first path or the third path with the first node, and configured to couple the second path or the fourth path with the second node.

15. The battery control device according to claim 13 , wherein the first path includes a filter circuit.

16. The battery control device according to claim 13 , wherein the first path includes a voltage protection circuit.

17. The battery control device according to claim 13 ,
wherein the first external electrode is a positive electrode of the battery cell, and
wherein the second external electrode is a negative electrode of the battery cell.

18. The battery control device according to claim 17 ,
wherein the third path includes a resistor, and
wherein the control circuit is configured to discharge a charge of the battery cell via the third path and the second path through the transistor.

Assignees

• Renesas Electronics Corp

Inventors

• Kiuchi Hideki

Classifications

• H02J7/585

  Sequential battery discharge in systems with a plurality of batteries · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/54

  Passive balancing, e.g. using resistors or parallel MOSFETs · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• B60L3/04

  Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) · CPC title