SYSTEM FOR CAUSING TEMPERATURE RISE IN BATTERY
First Claim
1. A battery temperature rise causing system, comprising:
- a rechargeable battery that holds electric power;
an accumulator that accumulates the electric power received from the battery;
a voltage converting unit that performs voltage conversion of the electric power between the battery and the accumulator; and
a control unit that receives a battery temperature of the battery and controls the converting unit, when the received battery temperature is lower than a reference value, to increase the battery temperature while alternately transferring electric power from the accumulator to the battery and from the battery to the accumulator,wherein the control unit receives a battery voltage of the battery and controls the converting unit to change a transfer direction of the electric power between the battery and the capacitor each time the received battery voltage reaches a battery upper limit or a battery lower limit.
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Accused Products
Abstract
A battery temperature rise causing system has a converting unit for converting voltage of electric power held in one of a rechargeable battery and a capacitor and applies the converted voltage to the other one, and a control unit controlling the converting unit to alternately perform first transfer of electric power from the battery to the capacitor and second transfer of electric power from the capacitor to the battery while changing the first transfer for the second transfer each time the battery voltage reaches a lower limit and changing the second transfer for the first transfer each time the battery voltage reaches an upper limit, and to increase temperature of the battery due to heat generated by electric current flowing through the battery during the electric power transfer.
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Citations
20 Claims
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1. A battery temperature rise causing system, comprising:
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a rechargeable battery that holds electric power; an accumulator that accumulates the electric power received from the battery; a voltage converting unit that performs voltage conversion of the electric power between the battery and the accumulator; and a control unit that receives a battery temperature of the battery and controls the converting unit, when the received battery temperature is lower than a reference value, to increase the battery temperature while alternately transferring electric power from the accumulator to the battery and from the battery to the accumulator, wherein the control unit receives a battery voltage of the battery and controls the converting unit to change a transfer direction of the electric power between the battery and the capacitor each time the received battery voltage reaches a battery upper limit or a battery lower limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A battery temperature rise causing system, comprising:
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a rechargeable battery that holds electric power; an accumulator that accumulates the electric power received from the battery; a voltage converting unit that performs voltage conversion of the electric power between the battery and the accumulator; and a control unit that receives a battery temperature of the battery and controls the converting unit, when the received battery temperature is lower than a reference value, to increase the battery temperature while alternately transferring electric power from the accumulator to the battery and from the battery to the accumulator, wherein the control unit stores in advance data indicating a relation between frequency in the transfer of the electric power and calorific power, generated in the battery due to the alternated transfer of the electric power, for each of levels of the battery temperature on condition that a battery voltage of the battery is lower than a battery upper limit and is higher than a battery lower limit, determines an optimum frequency at which the calorific power corresponding to the received battery temperature is maximized, and controls the converting unit to change a transfer direction of the electric power between the battery and the capacitor at the optimum frequency. - View Dependent Claims (10, 11)
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12. A battery temperature rise causing system, comprising:
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a rechargeable battery that holds electric power; an accumulator that accumulates the electric power received from the battery; a voltage converting unit that performs voltage conversion of the electric power between the battery and the accumulator; and a control unit that receives a battery temperature of the battery and controls the converting unit, when the received battery temperature is lower than a reference value, to increase the battery temperature while alternately transferring electric power from the accumulator to the battery and from the battery to the accumulator, wherein the control unit stores in advance data indicating a relation between frequency in the transfer of the electric power and battery current flowing through the battery, for each of levels of battery temperature on condition that a battery voltage of the battery is lower than a battery upper limit and is higher than a battery lower limit, determines an optimum frequency at which calorific power generated in the battery due to the alternated transfer of the electric power is maximized, by using the relation corresponding to the level of the received battery temperature, and controls the converting unit to change a transfer direction of the electric power between the battery and the capacitor at the optimum frequency. - View Dependent Claims (13, 14)
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15. A battery temperature rise causing system, comprising:
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a rechargeable battery that holds electric power; an accumulator that accumulates the electric power received from the battery or accumulates electric power regenerated in an electric motor; a voltage converting unit that performs voltage conversion of the electric power between the battery and the accumulator; an inverter that converts an accumulated power voltage of the electric power accumulated in the accumulator into an alternating current voltage and applying the alternating current voltage to the electric motor to drive the electric motor during running of a vehicle; and a control unit that receives a battery temperature of the battery and controls the converting unit, when the received battery temperature is lower than a reference value, to increase the battery temperature while alternately transferring electric power from the accumulator to the battery and transferring electric power from the battery to the accumulator, wherein the control unit determines a driving voltage, required to drive the electric motor, according to a running condition of the vehicle, receives the accumulated power voltage of the accumulator and a battery voltage of the battery, and controls the converting unit according to the driving voltage, the accumulated power voltage and the battery voltage to alternately perform the transfers of the electric power. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification