Battery system in which information transmission occurs via insulating circuits

Patent metadata

Field	Value
Publication number	US-9647466-B2
Application number	US-49503809-A
Country	US
Kind code	B2
Filing date	Jun 30, 2009
Priority date	Jul 1, 2008
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A battery system includes a battery module that is constituted with a plurality of serially connected battery cells, a plurality of integrated circuits that group the battery cells so as to perform processing on battery cells in each group, a first transmission path through which a command signal is transmitted via a first insulating circuit from a higher-order control circuit that controls the integrated circuits to a highest-order integrated circuit of the integrated circuit, a second transmission path through which a data signal collected by the integrated circuits is transmitted from the highest-order integrated circuit to a lowest-order integrated circuit, and a third transmission path through which the data signal is transmitted from the lowest-order integrated circuit to the higher-order control circuit via a second insulating circuit.

First claim

What is claimed is:

1. A battery system, comprising:
a first lithium ion battery module that is constituted with a plurality of serially connected first lithium ion battery cell groups constituted with a plurality of serially connected lithium ion battery cells;
a second lithium ion battery module that is constituted with a plurality of serially connected second lithium ion battery cell groups constituted with a plurality of serially connected lithium ion battery cells;
a connector that removably connects the first lithium ion battery module with the second lithium ion battery module in series;
one power supply line that is connected to one end of the first lithium ion battery module;
another power supply line that is connected to the other end of the second lithium ion battery module;
a plurality of first integrated circuits that are provided corresponding to each first lithium ion battery cell group constituting the first lithium ion battery module so as to perform processing on lithium ion battery cells of corresponding first lithium ion battery cell group; and
a plurality of second integrated circuits that are provided corresponding to each second lithium ion battery cell group constituting the second lithium ion battery module so as to perform processing on lithium ion battery cells of corresponding second lithium ion battery cell group, wherein:
the first and second integrated circuits each include transmission terminals for transmitting signals and reception terminals for receiving signals, and each further include a plurality of voltage detection terminals for receiving terminal voltage at each lithium ion battery cell constituting a corresponding lithium ion battery cell group;
a first transmission path is formed by electrically connecting transmission terminals of the plurality of first integrated circuits and reception terminals of adjacent first integrated circuits respectively;
a second transmission path is formed by electrically connecting transmission terminals of the plurality of second integrated circuits and reception terminals of adjacent second integrated circuits respectively, and
an insulating circuit is provided for performing information transmission between the reception terminal or the transmission terminal of the first integrated circuit provided corresponding to the first lithium ion battery cell group at the other end of the first lithium ion battery module and the reception terminal or the transmission terminal of the second integrated circuit provided corresponding to the second lithium ion battery cell group at the one end of the second lithium ion battery module, so as to perform information transmission between the first transmission path and the second transmission path via the insulating circuit.

2. A battery system, comprising:
a first lithium ion battery module that is constituted with a plurality of serially connected first lithium ion battery cell groups constituted with a plurality of serially connected lithium ion battery cells;
a second lithium ion battery module that is constituted with a plurality of serially connected second lithium ion battery cell groups constituted with a plurality of serially connected lithium ion battery cells;
one power supply line that is connected to one end of the first lithium ion battery module;
another power supply line that is connected to the other end of the second lithium ion battery module;
a connector that removably connects the first lithium ion battery module with the second lithium ion battery module in series;
a plurality of first integrated circuits that are provided corresponding to each first lithium ion battery cell group constituting the first lithium ion battery module so as to perform processing on lithium ion battery cells of corresponding first lithium ion battery cell group;
a plurality of second integrated circuits that are provided corresponding to each second lithium ion battery cell group constituting the second lithium ion battery module so as to perform processing on lithium ion battery cells of corresponding second lithium ion battery cell group; and
a control circuit that controls the plurality of first and second integrated circuits, wherein:
a series circuit is formed by electrically connecting the one power supply line, the first lithium ion battery module, the connector, the second lithium ion battery module, and the other power supply line;
the control circuit, including transmission terminals for transmitting information and reception terminals for receiving information, operates based upon a power source electrically insulated from the series circuit;
each of the first and second integrated circuits includes transmission terminals for transmitting information, reception terminals for receiving information, and voltage detection terminals for receiving terminal voltage at each lithium ion battery cell constituting a corresponding lithium ion battery cell group, includes an analog/digital converter circuit therein, and converts terminal voltage at each lithium ion battery cell that has been input to the voltage detection terminal into a digital value and holds the same;
a first transmission path is formed by electrically connecting transmission terminals of the plurality of first integrated circuits and reception terminals of adjacent first integrated circuits;
a second transmission path is formed by electrically connecting transmission terminals of the plurality of second integrated circuits and reception terminals of adjacent second integrated circuits;
a first insulating circuit is provided for performing information transmission between the transmission terminals of the control circuit and the reception terminals of the first integrated circuit provided corresponding to the first lithium ion battery cell group at the one end of the first lithium ion battery module, so as to perform information transmission between the control circuit and the first transmission path via the first insulating circuit;
a second insulating circuit is provided for performing information transmission between the transmission terminals of the first integrated circuit provided corresponding to the first lithium ion battery cell group at the other end of the first lithium ion battery module and the reception terminals of the second integrated circuit provided corresponding to the second lithium ion battery cell group at the one end of the second lithium ion battery module, so as to perform information transmission between the first transmission path and the second transmission path via the second insulating circuit; and
a third insulating circuit is provided for performing information transmission between the transmission terminals of the second integrated circuit provided corresponding to the second lithium ion battery cell group at the other end of the second lithium ion battery module and the reception terminals of the control circuit, so as to perform information transmission between the second transmission path and the control circuit via the third insulating circuit.

3. A battery system, comprising:
a first battery module that is constituted with a plurality of serially connected battery cells;
a second battery module that is constituted with a plurality of serially connected battery cells;
a connector that removably connects the first battery module with the second battery module in series;
a plurality of first integrated circuits that group battery cells of the first battery module by a plurality thereof so as to perform processing on battery cells in each group;
a plurality of second integrated circuits that group battery cells of the second battery module by a plurality thereof so as to perform processing on battery cells in each group;
a first transmission path through which a command signal is transmitted via a first insulating circui

Assignees

• Kubo Kenji
• Kudo Akihiko
• Kikuchi Mutsumi
• Shibahara Gosuke
• Hitachi Ltd
• Hitachi Automotive Systems Ltd

Inventors

• Kubo Kenji
• Kudo Akihiko
• Kikuchi Mutsumi
• Shibahara Gosuke

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/56

  Active balancing, e.g. using capacitor-based, inductor-based or DC-DC converters · CPC title

• H02J7/54

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

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title