Battery control system and vehicle control system

Patent metadata

Field	Value
Publication number	US-9821667-B2
Application number	US-201414909473-A
Country	US
Kind code	B2
Filing date	Jul 25, 2014
Priority date	Aug 9, 2013
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A battery control system connected to a battery, which controls charge/discharge at the battery, includes: a current detection unit that measures a current value by detecting a charge/discharge current flowing through the battery; a voltage detection unit that detects a voltage at the battery; a temperature detection unit that detects a temperature at the battery; an effective current value calculation unit that calculates, based upon the current value measured by the current detection unit, an effective current value in a predetermined time window; a time ratio calculation unit that determines a time ratio indicating a ratio of a length of time over which the effective current value has been in excess of a predetermined allowable value during a predetermined specified time period; and a charge/discharge restriction unit that restricts the charge/discharge current based upon the time ratio determined by the time ratio calculation unit.

First claim

The invention claimed is:

1. A battery control system connected to a battery, which controls charge/discharge at the battery, comprising:
a current detection unit that measures a current value by detecting a charge/discharge current flowing through the battery;
a voltage detection unit that detects a voltage at the battery;
a temperature detection unit that detects a temperature at the battery;
an effective current value calculation unit that calculates, based upon the current value measured by the current detection unit, an effective current value in a predetermined time window;
a time ratio calculation unit that determines a time ratio indicating a ratio of a length of time over which the effective current value has been in excess of a predetermined allowable value during a predetermined specified time period; and
a charge/discharge restriction unit that restricts the charge/discharge current based upon the time ratio determined by the time ratio calculation unit.

2. The battery control system according to claim 1 , wherein:
the specified time period is at least 24 hours.

3. The battery control system according to claim 1 , wherein:
the charge/discharge restriction unit restricts the charge/discharge current when the time ratio is equal to or greater than 0.5.

4. The battery control system according to claim 1 , wherein:
the charge/discharge restriction unit clears restriction on the charge/discharge current once a length of elapsed time having elapsed since the restriction on the charge/discharge current came into effect or a total length of time over which the restriction on the charge/discharge current has been in effect exceeds a predetermined restriction clearance time.

5. The battery control system according to claim 4 , wherein:
the battery control system is connected to an in-vehicle communication network; and
the charge/discharge restriction unit obtains information pertaining to the length of elapsed time or the total length of time via the communication network.

6. A vehicle control system, comprising:
a battery control system connected to a battery, which controls charge/discharge at the battery; and
a vehicle control unit connected with the battery control system, wherein:
the battery control system includes a current detection unit that measures a current value by detecting a charge/discharge current flowing through the battery, a voltage detection unit that detects a voltage at the battery, a temperature detection unit that detects a temperature at the battery and an effective current value calculation unit that calculates, based upon the current value measured by the current detection unit, an effective current value in a predetermined time window; and
the vehicle control unit determines a time ratio indicating a ratio of a length of time over which the effective current value has been in excess of a predetermined allowable value during a predetermined specified time period and issues an instruction for the battery control system so as to restrict the charge/discharge current based upon the time ratio having been determined.

Assignees

• Hitachi Automotive Systems Ltd
• Nissan Motor

Inventors

• Morikawa Hiroshi
• Aoshima Yoshinori
• Takada Masayuki
• Tsuru Kenichiro
• Kiyota Shigeyuki
• Tanaka Yoshiyuki
• Iguchi Toyoki
• Hashimoto Hiroaki
• Takahashi Yasuyuki

Classifications

• H02J2105/37

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

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/52

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

• H02J7/947

  in response to integrated charge or discharge current · CPC title