Battery pack with an automatic current regulation and charging method for the same
First Claim
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1. A battery pack, comprising:
- a battery including a positive electrode and a negative electrode;
a switching module including a charge switching device and a discharge switching device, the charge switching device and discharge switching device being electrically connected to a high current path of the battery;
a battery management unit (BMU) electrically connected to the switching module, the BMU being configured to adjust a limit value for a charging current supplied by the charge switching device and to set a magnitude of the charging current supplied by the charge switching device to be equal to or less than the adjusted limit value;
a temperature sensor electrically connected to the BMU and to the high current path of the battery; and
a voltage smoothing circuit electrically connected to the charge switching device, the BMU, and the high current path of the battery,wherein the BMU is configured to apply a pulse-width modulation (PWM) signal to the voltage smoothing circuit and to regulate the charging current of the charge switching device by varying a duty ratio of the PWM signal according to a temperature measured by the temperature sensor.
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Abstract
A battery pack includes a battery including a positive electrode and a negative electrode, a switching module including a charge switching device and a discharge switching device, the charge switching device and discharge switching device being electrically connected to a high current path of the battery, a battery management unit (BMU) electrically connected to the switching module, the BMU being configured to adjust a limit value for a charging current supplied by the charge switching device and to set a magnitude of the charging current supplied by the charge switching device to be equal to or less than the adjusted.
27 Citations
16 Claims
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1. A battery pack, comprising:
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a battery including a positive electrode and a negative electrode; a switching module including a charge switching device and a discharge switching device, the charge switching device and discharge switching device being electrically connected to a high current path of the battery; a battery management unit (BMU) electrically connected to the switching module, the BMU being configured to adjust a limit value for a charging current supplied by the charge switching device and to set a magnitude of the charging current supplied by the charge switching device to be equal to or less than the adjusted limit value; a temperature sensor electrically connected to the BMU and to the high current path of the battery; and a voltage smoothing circuit electrically connected to the charge switching device, the BMU, and the high current path of the battery, wherein the BMU is configured to apply a pulse-width modulation (PWM) signal to the voltage smoothing circuit and to regulate the charging current of the charge switching device by varying a duty ratio of the PWM signal according to a temperature measured by the temperature sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A battery pack, comprising:
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a battery including a positive electrode and a negative electrode; a switching module including a charge switching device and a discharge switching device, the charge switching device and discharge switching device being electrically connected to a high current path of the battery; and a battery management unit (BMU) electrically connected to the switching module, the BMU being configured to adjust a limit value for a charging current supplied by the charge switching device and to set a magnitude of the charging current supplied by the charge switching device to be equal to or less than the adjusted limit value, wherein the BMU includes; an analog front end electrically connected to the battery and to the switching module via a voltage smoothing circuit, the analog front end being configured to detect voltage in an open circuit voltage of the battery and to turn on/off the charge switching device and discharge switching device in the switching module, and a microprocessor unit electrically connected to the analog front end, the microprocessor unit being configured to control a current of the charge switching device in the switching module. - View Dependent Claims (12, 13)
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14. A charging method for a battery pack, comprising:
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detecting temperature and current of a battery; comparing the detected current to a value set using a limit value for the charging current for the detected temperature, limit values varying with temperature; and regulating a charging current of the battery, such that the charging current of the battery does not exceed the limit value of the charging current, wherein regulating the charging current of the battery includes; determining whether the detected current of the battery is above a hysteresis region, the hysteresis having positive and negative deviations with respect to current values for a given temperature, and reducing the charging current below the hysteresis region when the detected current of the battery is above the hysteresis region for the detected temperature. - View Dependent Claims (15, 16)
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Specification