Battery monitoring device and battery system using same

Patent metadata

Field	Value
Publication number	US-2016169976-A1
Application number	US-201314784440-A
Country	US
Kind code	A1
Filing date	Apr 26, 2013
Priority date	Apr 26, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

Provided are a battery monitoring device capable of suppressing a current flowing to individual battery cells and enhancing the safety thereof, even when there is a short circuit, for example, in a connection line connecting substrates having integrated circuits mounted thereon and a substrate having a microcomputer mounted thereon or a connection line connecting the substrates having the integrated circuits mounted thereon, and a battery system using the same. Resistors are provided in a positive electrode input line 13 a connecting a positive electrode side of a battery pack group 200 and a total voltage detecting unit 13 and/or a negative electrode input line 13 b connecting a negative electrode side of the battery pack group 200 and the total voltage detecting unit 13 and the resistors of the positive electrode input line 13 a and/or negative electrode input line 13 b are arranged on individual cell monitoring circuit boards 31 and 32.

First claim

1 . A battery monitoring device for monitoring a battery pack group formed by electrically connecting a plurality of battery packs, comprising:
a plurality of cell monitoring circuit boards on which first voltage detecting circuits to detect voltages of individual battery cells forming the battery packs are mounted, respectively; and a battery monitoring circuit board on which a second voltage detecting circuit to detect a total voltage of the battery pack group is mounted, wherein a total voltage detecting unit connected to a positive electrode side and a negative electrode side of the battery pack group is connected to the second voltage detecting circuit, at least one resistor is provided in a positive electrode input line to connect the positive electrode side of the battery pack group and the total voltage detecting unit and/or a negative electrode input line to connect the negative electrode side of the battery pack group and the total voltage detecting unit, and the resistor of the positive electrode input line and/or the negative electrode input line is arranged on at least one of the plurality of cell monitoring circuit boards.

2 . The battery monitoring device according to claim 1 , wherein the resistor of the positive electrode input line and/or the negative electrode input line is arranged to be distributed to each of the plurality of cell monitoring circuit boards.

3 . A battery monitoring device for monitoring a battery pack group formed by electrically connecting a plurality of battery packs, comprising:
a plurality of cell monitoring circuit boards on which integrated circuits to detect voltages of individual battery cells forming the battery packs are mounted, respectively; and a host control circuit board on which a microcomputer to detect a total voltage of the battery pack group is mounted, wherein a total voltage detecting unit connected to a positive electrode side and a negative electrode side of the battery pack group is connected to the microcomputer, at least one resistor is provided in a positive electrode input line to connect the positive electrode side of the battery pack group and the total voltage detecting unit and/or a negative electrode input line to connect the negative electrode side of the battery pack group and the total voltage detecting unit, and the resistor of the positive electrode input line and/or the negative electrode input line is arranged on at least one of the plurality of cell monitoring circuit boards.

4 . A battery monitoring device for monitoring a battery pack group formed by electrically connecting a plurality of battery packs, comprising:
a plurality of cell monitoring circuit boards on which integrated circuits to detect voltages of individual battery cells forming the battery packs are mounted, respectively, wherein a cell monitoring circuit board for battery monitoring selected from the plurality of cell monitoring circuit boards detects a total voltage of the battery pack group by the mounted integrated circuit, and a total voltage detecting unit connected to a positive electrode side and a negative electrode side of the battery pack group is provided in the integrated circuit of the cell monitoring circuit board for the battery monitoring, at least one resistor is provided in a positive electrode input line to connect the positive electrode side of the battery pack group and the total voltage detecting unit or a negative electrode input line to connect the negative electrode side of the battery pack group and the total voltage detecting unit, and the resistor of the positive electrode input line or the negative electrode input line is arranged on at least one of the plurality of cell monitoring circuit boards.

5 . The battery monitoring device according to claim 4 , wherein the cell monitoring circuit board for the battery monitoring is a cell monitoring circuit board on which an integrated circuit to detect a voltage of a battery cell having a highest potential in the battery pack group is mounted or a cell monitoring circuit board on which an integrated circuit to detect a voltage of a battery cell having a lowest potential in the battery pack group is mounted.

6 . A battery system, comprising:
the battery monitoring device according to claim 1 ; and a battery pack group including a plurality of battery packs connected to individual cell monitoring circuit boards of the battery monitoring device.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Miura Hikaru
• Kudoh Akihiko
• Kikuchi Mutsumi
• Kanai Tomonori

Classifications

• H02J7/54

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

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title