Battery monitoring device, power storage system, and control system

Patent metadata

Field	Value
Publication number	US-9910099-B2
Application number	US-201314654787-A
Country	US
Kind code	B2
Filing date	Jan 30, 2013
Priority date	Jan 30, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A controller of a battery monitoring apparatus, said controller calculating the amount of heat generated inside a battery on the basis of information about the electric current which flows out of or flows into the battery. Furthermore, the controller calculates the amount of heat discharged from the surface of the battery, said amount being calculated on the basis of temperature information about at least one from among the surface of the battery and a substance in the vicinity of the battery. In addition, the controller calculates the temperature inside the battery on the basis of information about the amount of heat generated, and information about the amount of heat discharged.

First claim

The invention claimed is:

1. A battery monitoring apparatus, comprising:
an electric current information acquirer acquiring information about electric current flowing out of a battery or flowing into the battery;
a generated heat amount calculator calculating the amount of heat generated inside the battery, on the basis of the information about electric current acquired by the electric current information acquirer;
a temperature information acquirer acquiring temperature information about at least one out of the surface of the battery and a substance in the vicinity of the battery;
a discharged heat amount calculator calculating the amount of heat discharged from the surface of the battery, on the basis of the temperature information acquired by the temperature information acquirer; and
an internal temperature calculator calculating the internal temperature of the battery, on the basis of the generated heat amount information and the information about the amount of heat discharged from the surface of the battery,
wherein:
the battery is located inside a container having an air inlet and an air outlet,
the temperature information acquirer acquires temperature information about air supplied from the air inlet, temperature information about air flowed out from the air outlet and an external surface temperature of the container, and
the discharged heat amount calculator acquires information about the amount of air supplied from the air inlet or flowed out from the air outlet, calculates the amount of heat discharged from the container on the basis of information about the amount of air, the temperature information about air supplied from the air inlet, the temperature information about air flowed out from the air outlet and the external surface temperature of the container, and calculates the amount of heat discharged from the surface of the battery on the basis of the information about the amount of heat discharged from the container.

2. The battery monitoring apparatus according to claim 1 , further comprising:
a voltage information acquirer acquiring voltage information between terminals of the battery; and
a state-of-charge calculator specifying an internal resistance value of the battery on the basis of the information about the internal temperature of the battery, calculating an open-circuit voltage value of the battery on the basis of the internal resistance value and the voltage information between terminals of the battery, and calculating the state of charge of the battery on the basis of the calculated open-circuit voltage value.

3. A power storage system provided with a power storage apparatus and a battery monitoring apparatus, wherein:
the power storage apparatus comprises at least one battery located inside a container having an air inlet and an air outlet; and
the battery monitoring apparatus comprises:
an electric current information acquirer acquiring information about electric current flowing out of a battery or flowing into the battery,
a generated heat amount calculator calculating the amount of heat generated inside the battery, on the basis of the information about electric current acquired by the electric current information acquirer,
a temperature information acquirer acquiring temperature information about air supplied from the air inlet, temperature information about air flowed out from the air outlet and an external surface temperature of the container,
a discharged heat amount calculator acquiring information about the amount of air supplied from the air inlet or flowed out from the air outlet, and calculating the amount of heat discharged from the surface of the battery, on the basis of the information about the amount of air and the temperature information about air supplied from the air inlet, the temperature information about air flowed out from the air outlet and the external surface temperature of the container acquired by the temperature information acquirer, and
an internal temperature calculator calculating the internal temperature of the battery, on the basis of the generated heat amount information and the information about the amount of heat discharged from the surface of the battery.

4. The power storage system according to claim 3 , wherein:
the power storage apparatus comprises a ventilator for changing the air of the inside of the container in which the battery is located, and
the battery monitoring apparatus comprises a ventilator controller controlling the ventilator on the basis of information about the internal temperature of the battery calculated by the internal temperature calculator.

5. A control system comprising a power storage apparatus, a battery monitoring apparatus and an electric power control apparatus, wherein:
the power storage apparatus comprises at least one battery located inside a container having an air inlet and an air outlet;
the battery monitoring apparatus comprises:
an electric current information acquirer acquiring information about electric current flowing out of a battery or flowing into the battery,
a generated heat amount calculator calculating the amount of heat generated inside the battery, on the basis of the information about electric current acquired by the electric current information acquirer,
a temperature information acquirer acquiring temperature information about air supplied from the air inlet, temperature information about air flowed out from the air outlet and an external surface temperature of the container,
a discharged heat amount calculator acquiring information about the amount of air supplied from the air inlet or flowed out from the air outlet, calculating the amount of heat discharged from the surface of the battery, on the basis of the information about the amount of air and the temperature information about air supplied from the air inlet, the temperature information about air flowed out from the air outlet and the external surface temperature of the container acquired by the temperature information acquirer, and
an internal temperature calculator calculating the internal temperature of the battery, on the basis of the generated heat amount information and the information about the amount of heat discharged from the surface of the battery; and

the electric power control apparatus comprises:
a battery information acquirer acquiring from the battery monitoring apparatus at least one item of information from among information about the internal temperature of the battery and information calculated using the information about the internal temperature of the battery, and
a charging/discharging controller controlling discharging or charging of the power storage apparatus on the basis of the information acquired by the battery information acquirer.

6. The control system according to claim 5 , wherein:
the battery monitoring apparatus comprises:
a voltage information acquirer acquiring voltage information between terminals of the battery, and
a state-of-charge calculator specifying an internal resistance value of the battery on the basis of the information about the internal temperature of the battery, calculating an open-circuit voltage value of the battery on the basis of the internal resistance value and the voltage information between the terminals of the battery, and calculating the state of charge of the power storage apparatus on the basis of the calculated open-circuit voltage value;

the battery information acquirer acquires information about the state of charge of the power storage apparatus from the battery monitoring apparatus; and
the charging/discharging controller controls discharging or charging of the power storage apparatus on the basis of the information about the state of charge of the power storage apparatus.

7. The control syst

Assignees

• Okada Yuruki
• Shiraga Sho
• Wada Toshihiro
• Yoshioka Shoji
• Mitsubishi Electric Corp

Inventors

• Okada Yuruki
• Shiraga Sho
• Wada Toshihiro
• Yoshioka Shoji

Classifications

• H01M10/486

  for measuring temperature · CPC title

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H02J7/007

  Electricity · mapped topic

• H02J7/0021

  Electricity · mapped topic