POWER STORAGE SYSTEM

• US 20170057376A1
• Filed: 02/18/2015
• Published: 03/02/2017
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: MURATA, Takashi
• Granted Patent: US 10,322,645 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 53/20 characterised by converters located in the vehicle
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 10/615 Heating or keeping warm
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/633 characterised by algorithms, flow charts, software details or the like
• CPC Class Codes: H01M 10/6571 Resistive heaters arrangements for heating the battery by its resistance to the internal current H01M10/637
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y10S 903/903 : having energy storing means, e.g. battery, capacitor

Abstract

A power storage system for a vehicle includes a battery, a temperature sensor, a battery heater, a charger, and a controller. The battery is configured to supply electric power to a motor for traveling of the vehicle, and configured to be charged with external power supplied from an external power supply. The temperature sensor is configured to detect a temperature of the battery. The battery heater is configured to raise the temperature of the battery. The charger is configured to be connectable with the external power supply, and deliver the external power to the battery and the battery heater, respectively. The controller is configured to perform charge control. The charge control is a control that charges the battery with the external power. The controller is configured to store a map. The map specifies, for each temperature of the battery, a ratio of a temperature-elevating power supplied to the battery heater to a maximum power of the external power at the time when a charging time is minimized. The controller is configured to calculate the ratio, using the map, from the temperature of the battery measured at the time when charging is started. The controller is configured to perform temperature regulation control during charging, using the temperature-elevating power corresponding to the calculated ratio. The temperature regulation control is a control that supplies a part of the external power to the battery heater during charging so as to raise the temperature of the battery.

Claims

1. A power storage system for a vehicle, the power storage system comprising:

a battery configured to supply electric power to a motor for traveling of the vehicle, the battery being configured to be charged with external power supplied from an external power supply;

a temperature sensor configured to detect a temperature of the battery;

a battery heater configured to raise the temperature of the battery;

a charger configured to be connectable with the external power supply, and deliver the external power to the battery and the battery heater, respectively; and

a controller configured to

perform charge control, the charge control being a control that charges the battery with the external power;

store a map, the map specifying, for each temperature of the battery, a ratio of a temperature-elevating power supplied to the battery heater to a maximum power of the external power at the time when a charging time is minimized;

calculate the ratio, using the map, from the temperature of the battery measured at the time when charging is started and

perform temperature regulation control during charging, using the temperature-elevating power corresponding to the calculated ratio, the temperature regulation control being a control that supplies a part of the external power to the battery heater during charging so as to raise the temperature of the battery.

2. The power storage system according to claim 1, wherein the controller is configured to

perform the charge control and the temperature regulation control in a first charge mode and a second charge mode, the first charge mode being a mode in which the battery is charged with a first charging power until an amount of charge of the battery becomes equal to a first charge amount, and a first temperature-elevating power is supplied to the battery heater, the second charge mode being a mode in which the battery is charged with a second charging power as a fixed value after the amount of charge of the battery reaches the first charge amount, and a second temperature-elevating power is supplied to the battery heater,

set a difference between the temperature-elevating power calculated based on the map and the maximum power as the first charging power when the temperature-elevating power calculated based on the map as the first temperature-elevating power, and

newly set the first temperature-elevating power such that the first charging power becomes larger than the second charging power when the set first charging power is smaller than the second charging power.

3. The power storage system according to claim 2, wherein the controller is configured to

compare a difference between the maximum power and the second charging power with the temperature-elevating power calculated based on the map,

set the first temperature-elevating power using a smaller one of the difference and the temperature-elevating power calculated based on the map, and

set a difference between the maximum power and the set first temperature-elevating power as the first charging power.

4. The power storage system according to claim 1, wherein

the controller is configured to perform the charge control and the temperature regulation control in a first charge mode and a second charge mode, the first charge mode being a mode in which a difference between the maximum power of the external power and the temperature-elevating power calculated based on the map is set as a first charging power, and the battery is charged with the first charging power until an amount of charge of the battery becomes equal to a first charge amount, while the temperature-elevating power calculated based on the map is supplied to the battery heater, the second charge mode being a mode in which the battery is charged with a second charging power that is smaller than the first charging power after the amount of charge of the battery reaches the first charge amount, and a difference between the maximum power and the second charging power, or electric power corresponding to a maximum output of the battery heater, is supplied to the battery heater.