Battery management system and driving method thereof
First Claim
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1. A battery management system for a vehicle, comprising:
- a main control unit (MCU) configured to set an open circuit voltage (OCV) setting and estimate a state of charge (SOC) therefrom for a plurality of times; and
a sensing unit configured to measure a battery current of a battery and a battery voltage of the battery, the battery current and the battery voltage being measured at an expiration of a determining period, and to transmit at least the battery voltage to the MCU,wherein the MCU is further configured to, for each of the plurality of times;
set the battery voltage measured at the expiration of the determining period as the OCV setting and estimate the SOC therefrom in response to a length of time of a no-load state period equaling a length of time of the determining period, and the lengths of time of the no-load state period and the determining period are measured with respect to a stop point; and
extend the determining period by an increment of time upon the setting of the OCV setting, andwherein the no-load state period is a period in which the battery is not being charged and not being discharged.
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Abstract
Battery management system and a driving method thereof including a sensing unit and an MCU. The sensing unit measures a battery current and a battery voltage. The MCU sets an OCV during a no-load state period at time increments measured from the beginning of the no-load state period, and estimates an SOC corresponding to the set OCV.
5 Citations
17 Claims
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1. A battery management system for a vehicle, comprising:
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a main control unit (MCU) configured to set an open circuit voltage (OCV) setting and estimate a state of charge (SOC) therefrom for a plurality of times; and a sensing unit configured to measure a battery current of a battery and a battery voltage of the battery, the battery current and the battery voltage being measured at an expiration of a determining period, and to transmit at least the battery voltage to the MCU, wherein the MCU is further configured to, for each of the plurality of times; set the battery voltage measured at the expiration of the determining period as the OCV setting and estimate the SOC therefrom in response to a length of time of a no-load state period equaling a length of time of the determining period, and the lengths of time of the no-load state period and the determining period are measured with respect to a stop point; and extend the determining period by an increment of time upon the setting of the OCV setting, and wherein the no-load state period is a period in which the battery is not being charged and not being discharged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A driving method of a battery management system for a vehicle, the driving method comprising:
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(a) measuring a length of time of a no-load state period with respect to a stop point; (b) during the no-load state period, setting a measured battery voltage of a battery as an open circuit voltage (OCV) setting in response to the length of time of the no-load state period equaling a length of time of a determining period with respect to the stop point; (c)estimating a state of charge (SOC) from the OCV setting; (d) extending the determining period by an increment of time upon the setting of the OCV setting; and (e) repeating steps (a) through (d), wherein the no-load state period is a period in which the battery is not being charged and not being discharged. - View Dependent Claims (10, 11, 12, 13)
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14. A battery management system for a vehicle, comprising:
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a main control unit (MCU) configured to set an open circuit voltage (OCV) setting; and a sensing unit configured to measure a battery current of a battery and a battery voltage of the battery, and to transmit at least the battery voltage to the MCU, wherein the MCU is further configured to set the measured battery voltage as the OCV setting and to estimate a state of charge (SOC) therefrom upon expiration of each of a plurality of increments of time during a no-load state period, a first of the increments of time being measured with respect to a stop point, a second of the increments of time being measured with respect to the expiration of the first of the increments of time, and a third of the increments of time being measured with respect to the expiration of the second of the increments of time, and wherein the no-load state period is a period in which the battery is not being charged and not being discharged. - View Dependent Claims (15, 16, 17)
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Specification