Battery management system and driving method thereof
First Claim
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1. A battery management system comprising a plurality of battery cells, the system comprising:
- a voltage and current sensor for the battery that generates voltage and current signals concerning the battery; and
a main controller that receives the voltage and current signals from the sensor and is configured to;
(a) measure a key-on open circuit voltage (OCV) using the battery voltage signal, (b) determine whether the key-on OCV belongs to a first OCV region or a second OCV region, and (c) estimate an initial state of charge (SOC) of the battery using a linear equation when the key-on OCV belongs to the first OCV region;
wherein the main controller is further configured to calculate the key-off time period, the key-off time period being an amount of time that the battery has been in a key-off state from a key-off time point to a time point at which the present key-on state begins, and to compare the key-off time with a reference time; and
wherein when the key-off time is longer than the reference time the main controller determines whether the key-on OCV belongs to the first OCV region.
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Abstract
A battery management system for managing a battery including a plurality of battery cells and a driving method are provided. The system includes a sensor, and a main control unit (MCU). The sensor senses a voltage and a current of the battery. The MCU receives the voltage and the current of the battery, measures an open circuit voltage (OCV) in key-on using the battery voltage, and estimates an initial SOC depending on the OCV in the key-on. The MCU divides the OCV into first and second OCV regions, and, when the OCV in the key-on is in the first OCV region, estimates the initial SOC using a linear equation.
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13 Claims
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1. A battery management system comprising a plurality of battery cells, the system comprising:
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a voltage and current sensor for the battery that generates voltage and current signals concerning the battery; and a main controller that receives the voltage and current signals from the sensor and is configured to;
(a) measure a key-on open circuit voltage (OCV) using the battery voltage signal, (b) determine whether the key-on OCV belongs to a first OCV region or a second OCV region, and (c) estimate an initial state of charge (SOC) of the battery using a linear equation when the key-on OCV belongs to the first OCV region;wherein the main controller is further configured to calculate the key-off time period, the key-off time period being an amount of time that the battery has been in a key-off state from a key-off time point to a time point at which the present key-on state begins, and to compare the key-off time with a reference time; and wherein when the key-off time is longer than the reference time the main controller determines whether the key-on OCV belongs to the first OCV region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of estimating an initial state of charge (SOC) of a battery, comprising:
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(a) sensing voltage and current from the battery to obtain voltage and current signals; (b) measuring a key-on open circuit voltage (OCV) using the voltage signal; (c) determining whether the key-on OCV belongs to a first OCV region or a second OCV region; and (d) estimating the initial SOC using a linear equation when the key-on OCV belongs to the first OCV region; wherein step (c) comprises; comparing a key-off time of the battery with a reference time; and determining the key-on OCV to be in the first OCV region when the key-off time is longer than the reference time. - View Dependent Claims (11, 12, 13)
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Specification