Storage battery, method of controlling storage battery, and non-transitory storage medium

Patent metadata

Field	Value
Publication number	US-2016276715-A1
Application number	US-201415034407-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Nov 14, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

A problem to be solved is to realize a reduction of a difference in temperature between battery cells. Provided is a storage battery ( 10 ) including an electrical storage unit ( 20 ) including a battery cell group having a plurality of battery cells connected in series, a temperature difference detection unit ( 21 ) that detects a difference in temperature between the plurality of battery cells, and a charging and discharging control unit ( 22 ) that executes control processing of controlling at least one of charging to the electrical storage unit ( 20 ) and discharging from the electrical storage unit ( 20 ) so that the amount of current flowing in a battery cell having a relatively low temperature among the plurality of battery cells becomes greater than the amount of current flowing in a battery cell having a relatively high temperature among the plurality of battery cells.

First claim

1 . A storage battery, comprising:
an electrical storage unit including a battery cell group having a plurality of battery cells connected in series; a temperature difference detection unit that detects a difference in temperature between the plurality of battery cells; and a charging and discharging control unit that executes control processing of controlling at least one of charging to the electrical storage unit and discharging from the electrical storage unit so that the amount of current flowing in a battery cell having a relatively low temperature among the plurality of battery cells becomes greater than the amount of current flowing in a battery cell having a relatively high temperature among the plurality of battery cells.

2 . The storage battery according to claim 1 , further comprising an auxiliary electrical storage unit capable of storing electric power,
wherein the charging and discharging control unit connects the auxiliary electrical storage unit to the battery cell having a relatively high temperature in parallel, and controls discharging from the electrical storage unit so that discharging is performed from the electrical storage unit and the auxiliary electrical storage unit in a state of the parallel connection.

3 . The storage battery according to claim 1 ,
wherein the charging and discharging control unit controls charging to the electrical storage unit so as to execute processing of supplying electric power supplied from an external power supply to an entirety of the plurality of battery cells which are connected in series, and processing of individually supplying the electric power to the battery cell having a relatively low temperature.

4 . The storage battery according to claim 1 , further comprising an auxiliary electrical storage unit capable of storing electric power,
wherein the charging and discharging control unit controls charging to the electrical storage unit so as to execute processing of supplying electric power supplied from an external power supply to the entirety of the plurality of battery cells which are connected in series, and processing of individually supplying electric power stored in the auxiliary electrical storage unit to the battery cell having a relatively low temperature.

5 . The storage battery according to claim 1 , further comprising a determination unit that determines whether or not the difference in temperature is equal to or more than a predetermined value,
wherein when the difference in temperature is determined as being equal to or more than the predetermined value, the charging and discharging control unit executes the control processing in accordance with the determination result.

6 . A method of controlling a storage battery including an electrical storage unit including a battery cell group having a plurality of battery cells connected in series, the method comprising:
a temperature difference detection step of detecting a difference in temperature between the plurality of battery cells; and a charging and discharging control step of executing control processing of controlling at least one of charging to the electrical storage unit and discharging from the electrical storage unit so that the amount of current flowing in a battery cell having a relatively low temperature among the plurality of battery cells becomes greater than the amount of current flowing in a battery cell having a relatively high temperature among the plurality of battery cells.

7 . A non-transitory storage medium storing a program for a storage battery including an electrical storage unit including a battery cell group having a plurality of battery cells connected in series, the program allowing a computer to function as:
a temperature difference detection unit that detects a difference in temperature between the plurality of battery cells; and a charging and discharging control unit that executes control processing of controlling at least one of charging to the electrical storage unit and discharging from the electrical storage unit so that the amount of current flowing in a battery cell having a relatively low temperature among the plurality of battery cells becomes greater than the amount of current flowing in a battery cell having a relatively high temperature among the plurality of battery cells.

Assignees

• Nec Corp

Inventors

• Kajitani Hiroshi

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/54

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

• H02J7/52

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

• H01M10/4257 Primary

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title