Battery control system and vehicle control system

Patent metadata

Field	Value
Publication number	US-2016185248-A1
Application number	US-201414910277-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Aug 9, 2013
Publication date	Jun 30, 2016
Grant date	—

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; and a charge/discharge restriction unit that imposes a first charge/discharge restriction so as to restrict the charge/discharge current based upon the effective current value calculated by the effective current value calculation unit.

First claim

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 cumulative time length calculation unit that calculates a cumulative time length expressed as a cumulative value for a length of time over which the effective current value has been in excess of a predetermined allowable value; and a charge/discharge restriction unit that imposes a first charge/discharge restriction so as to restrict an allowable value of the charge/discharge current to a predetermined first current value based upon the effective current value calculated by the effective current value calculation unit and imposes a second charge/discharge restriction to further restrict the allowable value of the charge/discharge current to a predetermined second current value, which is smaller than the first current value and larger than zero based upon the cumulative time length calculated by the cumulative time length calculation unit.

2 . The battery control system according to claim 1 , wherein:
the effective current value calculation unit individually calculates a plurality of effective current values in a plurality of time windows different from one another; and the charge/discharge restriction unit imposes the first charge/discharge restriction based upon the plurality of effective current values.

3 . (canceled)

4 . The battery control system according to claim 1 , wherein:
the charge/discharge restriction unit sets a threshold value for the cumulative time length in correspondence to the effective current value and imposes the second charge/discharge restriction based upon results obtained by comparing the cumulative time length with the threshold value.

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

6 . The battery control system according to claim 5 , 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.

7 . 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 issues an instruction for the battery control system so as to impose a first charge/discharge restriction to restrict an allowable value of the charge/discharge current to a predetermined first current value based upon the effective current value calculated by the effective current value calculation unit, and the vehicle control unit calculates a cumulative time length expressed as a cumulative value for a length of time over which the effective current value has been in excess of a predetermined allowable value, and imposes a second charge/discharge restriction to further restrict the allowable value of the charge/discharge current to a predetermined second current value, which is smaller than the first current value and larger than zero, based upon the calculated cumulative time length.

Assignees

• Hitachi Automotive Systems Ltd
• Nissan Motor

Inventors

• Aoshima Yoshinori
• Morikawa Hiroshi
• 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

• H02J7/54

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

• H02J7/865 Primary

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title