Battery voltage monitoring apparatus

Patent metadata

Field	Value
Publication number	US-2016231384-A1
Application number	US-201615130693-A
Country	US
Kind code	A1
Filing date	Apr 15, 2016
Priority date	Jan 5, 2007
Publication date	Aug 11, 2016
Grant date	—

Abstract

A battery voltage monitoring apparatus monitoring a voltage of an assembled battery, the assembled battery including a plurality of battery cells, comprising; a first voltage sensor module that monitors voltages of a plurality of battery cells arranged at a high voltage side; and a second voltage sensor module that monitors voltages of a plurality of battery cells arranged at a low voltage side, wherein the second voltage sensor module comprises a voltage sensor that is connected to a terminal and detects a voltage of a battery cell connected to the terminal, the terminal being supplied with a power source potential of the second voltage sensor module, the voltage sensor comprises a comparator including a first terminal and a second terminal, the first terminal being supplied with a voltage according to the voltage of the battery cell, the second terminal being supplied with a reference voltage.

First claim

What is claimed is:

1 . A battery voltage monitoring apparatus monitoring a voltage of an assembled battery, the assembled battery including a plurality of battery cells, comprising;
a first voltage sensor module that monitors voltages of a plurality of battery cells arranged at a high voltage side; and a second voltage sensor module that monitors voltages of a plurality of battery cells arranged at a low voltage side, wherein the second voltage sensor module comprises a voltage sensor that is connected to a terminal and detects a voltage of a battery cell connected to the terminal, the terminal being supplied with a power source potential of the second voltage sensor module, the voltage sensor comprises a comparator including a first terminal and a second terminal, the first terminal being supplied with a voltage according to the voltage of the battery cell, the second terminal being supplied with a reference voltage, and the comparator has a hysteresis characteristic and the hysteresis characteristic of the comparator is set according to an output of the comparator.

2 . The battery voltage monitoring apparatus according to claim 1 , wherein
the second voltage sensor module further comprises:
an output logic circuit outputting a voltage detection signal based on an output of the voltage sensor, the voltage detection signal indicating that an abnormal voltage is detected; and
a delay circuit adding a certain delay to the output of the voltage sensor and outputting the delayed voltage detection signal to the output logic circuit.

3 . The battery voltage monitoring apparatus according to claim 1 , wherein
the comparator having the hysteresis characteristic short-circuits at least one resistor connected to an input terminal of the comparator according to a change in the output of the comparator so that the hysteresis characteristic is obtained.

4 . The battery voltage monitoring apparatus according to claim 2 , wherein
the voltage sensor further comprises:
a voltage divider resistor including at least two resistors connected in series with each other, the two resistors being connected to the battery cell in parallel; and
a switching element connected to one of the two resistors in parallel, the switching element being configured to be short-circuited according to the output of the comparator, and
wherein a voltage of a node between the two resistors is supplied to the first terminal of the comparator.

5 . The battery voltage monitoring apparatus according to claim 4 , wherein
the output logic circuit outputs the voltage detection signal after the switching element is short-circuited.

6 . The battery voltage monitoring apparatus according to claim 2 , wherein the second voltage sensor module further comprises a level shift circuit connected between the delay circuit and the output logic circuit.

7 . The battery voltage monitoring apparatus according to claim 1 , wherein
each of the first and second voltage sensor modules further comprises:
a plurality of input terminals, each input terminal being connected to a respective one of the plurality of battery cells through a voltage measurement line; and
a plurality of current sources connected to the plurality of input terminals, the current sources being configured to feed currents through the plurality of input terminals on a condition that there is no disconnection in the voltage measurement line.

8 . The battery voltage monitoring apparatus according to claim 1 , wherein
the second voltage sensor module further comprises:
first, second, and third input terminals connected to the plurality of battery cells through first, second, and third voltage measurement lines, respectively;
a first resistor connected to the first and second input terminals, the first resistor being configured to keep a potential deference between the first and the second input terminals at a first predetermined value on a condition that there is no disconnection in the first and the second voltage measurement lines; and
a second resistor connected to the second and the third input terminals, the second resistor being configured to keep a potential difference between the second and the third input terminals at a second predetermined value on a condition that there is no disconnection in the second and the third voltage measurement line.

9 . The battery voltage monitoring apparatus according to claim 2 , wherein
the delay circuit comprises a resistance component and a capacitance component.

10 . The battery voltage monitoring apparatus according to claim 1 , wherein
the comparator is a comparator for excess voltage detection detecting an excess voltage of the battery cell.

Assignees

• Renesas Electronics Corp

Inventors

• Miyamoto Manabu

Classifications

• G01R19/16542

  for batteries (charge condition monitoring in G01R31/36) · CPC title

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title

• G01R31/396

  Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery · CPC title

• G01R31/3835 Primary

  involving only voltage measurements · CPC title

• G01R15/04 Primary

  Voltage dividers · CPC title