Current control system, current control method, and temperature distribution calculation method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasataka SATO
Life of this patent
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Abstract
The current control system includes a plurality of temperature sensors disposed on a main surface of a power storage cell, and an ECU that controls a charging current of the power storage cell based on measurement values of the temperature sensors. The ECU calculates a temperature distribution of the main surface based on measurement values of the temperature sensors by using a temperature distribution calculation model obtained in advance, calculates a current distribution in the power storage cell based on the temperature distribution, and calculates a value of the charging current that can be input to the power storage cell based on the current distribution.
Claims5
A current control system for controlling a charging current of a power storage cell included in a bipolar lithium-ion secondary battery, the current control system comprising:
- a plurality of temperature measurement units disposed on a surface of the power storage cell;
- and
- a controller configured to control the charging current of the power storage cell based on a measurement value measured by each of the temperature measurement units,
- wherein the controller is configured to
- calculate, by using a temperature distribution calculation model obtained in advance, a temperature distribution of the surface based on the measurement value of each of the temperature measurement units,
- calculate a current distribution in the power storage cell based on the temperature distribution, and
- calculate a value of the charging current inputtable to the power storage cell based on the current distribution.
A current control method of a current control system for controlling a charging current of a power storage cell included in a bipolar lithium-ion secondary battery, the current control method comprising:
- acquiring a measurement value of each of a plurality of temperature measurement units disposed on a surface of the power storage cell;
- calculating, by using a temperature distribution calculation model obtained in advance, a temperature distribution of the surface based on the measurement value of each of the temperature measurement units;
- calculating a current distribution in the power storage cell based on the temperature distribution;
- and
- calculating a value of the charging current inputtable to the power storage cell based on the current distribution.
A temperature distribution calculation method of calculating a temperature distribution of a surface of a power storage cell by using a plurality of temperature measurement units disposed on the surface, the temperature distribution calculation method comprising:
- acquiring a first measurement value of a first measurement unit among the temperature measurement units, the first measurement unit being disposed at a first position in a temperature change region in which a temperature increases or decreases as a distance from a predetermined temperature center on the surface increases;
- acquiring a second measurement value of a second measurement unit among the temperature measurement units, the second measurement unit being disposed at a second position belonging to a temperature range different from a temperature range of the first position in the temperature change region;
- and
- calculating a temperature at an intermediate position between a first contour and a second contour on the surface based on the first measurement value and the second measurement value, by using a first equation of the first contour on which the first measurement unit is disposed and a second equation of the second contour on which the second measurement unit is disposed, the first contour being determined based on coordinates of the first measurement unit on the surface and a region temperature distribution that is a temperature distribution in the temperature change region, and being a contour of temperatures centered at the temperature center, the second contour being determined based on coordinates of the second measurement unit on the surface and the region temperature distribution, and being a contour of temperatures centered at the temperature center.
Dependencies are inferred from the claim text.