Battery charging system for controlling the supply of charging current depending on battery temperature, a battery operated system and a method for state controlled charging
First Claim
1. A battery charging system, comprising:
- a first switchable path for supplying charging current from an energy source to a battery;
a second path, in parallel with the first switchable path, for supplying charging current from a controlled charging device to the battery; and
a control unit for controlling the supply of charging current along the first switchable path and the second path in response to a detected temperature of the battery,wherein the control unit is configured to communicate with a first temperature sensor for receiving information regarding the detected temperature of the battery, and to control the supply of charging current along the second path and to break the first switchable path such that the battery receives charging current from the controlled charging device via the second path, and not from the energy source via the first switchable path, in response to detection of the temperature of the battery above a predetermined first threshold temperature.
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Abstract
A battery charging system (15) and method for state controlled charging of a battery (12). The battery charging system comprises two parallel paths (16, 17) for supplying charging current to the battery (12) from two parallel sources of charging current, an energy source (13) and a controlled charging device (14). A control unit (18) is adapted to control the supply of charging current along the two paths in response to a detected state of the battery (12). If a state above a predetermined threshold is detected, the control unit (18) controls the supply of charging current such that the battery (12) receives charging current from the controlled charging device (14), but not directly from the energy source (13). The detected state of the battery may e.g. be a temperature state. The present invention allows for balancing the demands of high charging rate and long expected lifetime of the battery (12).
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Citations
17 Claims
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1. A battery charging system, comprising:
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a first switchable path for supplying charging current from an energy source to a battery; a second path, in parallel with the first switchable path, for supplying charging current from a controlled charging device to the battery; and a control unit for controlling the supply of charging current along the first switchable path and the second path in response to a detected temperature of the battery, wherein the control unit is configured to communicate with a first temperature sensor for receiving information regarding the detected temperature of the battery, and to control the supply of charging current along the second path and to break the first switchable path such that the battery receives charging current from the controlled charging device via the second path, and not from the energy source via the first switchable path, in response to detection of the temperature of the battery above a predetermined first threshold temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery operated system, comprising:
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a battery charging system comprising a first switchable path for supplying charging current from an energy source to a battery, a second path, in parallel with the first switchable path, for supplying charging current from a controlled charging device to the battery, and a control unit for controlling the supply of charging current along the first switchable path and the second path in response to a detected temperature of the battery, the control unit being configured to communicate with a first temperature sensor for receiving information regarding the detected temperature of the battery, and to control the supply of charging current along the second path and to break the first switchable path such that the battery receives charging current from the controlled charging device via the second path, and not from the energy source via the first switchable path, in response to detection of the temperature of the battery above a predetermined first threshold temperature; an energy source connected to the first switchable path of the battery charging system; a controlled charging device connected to the second path of the battery charging system; a battery connected to the first switchable path and the second path of the battery charging system; and a first temperature sensor adapted to detect the temperature of the battery and having a communication connection with the control unit of the battery charging system. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for state controlled charging of a battery, the method comprising:
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detecting a temperature of the battery; and supplying charging current to the battery in response to the detected temperature of the battery, wherein the supply of charging current to the battery is controlled such that the battery receives charging current from an energy source via a first switchable path and from a controlled charging device via a second path, in parallel with the first switchable path, until a temperature above a predetermined first threshold temperature is detected, and when the temperature is detected to be above the predetermined first threshold temperature, the supply of charging current to the battery is controlled such that the battery receives charging current from the controlled charging device but not from the energy source via the first switchable path. - View Dependent Claims (15, 16, 17)
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Specification