Apparatus and method for diagnosing state of battery pack
AssigneeLG Energy Solution, Ltd.
InventorsDong-Chun LEE, Won-Hoe LEE, Seog-Jin YOON, Suk-Hoon LEE
Life of this patent
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Abstract
The present disclosure relates to an apparatus and method for diagnosing a state of a battery pack, and more particularly, to an apparatus and method for diagnosing a state of a battery pack based on a SOC of a battery module included in the battery pack. According to the present disclosure, since the SOC of the battery module corresponding to an induced abnormal situation is estimated and the state of each battery module is diagnosed based on the estimated SOC, a risk factor that may occur in the battery module may be diagnosed in advance.
Claims11
An apparatus for diagnosing a state of a battery pack, comprising:
- a charging and discharging assembly configured to discharge and charge a plurality of battery modules having a plurality of battery cells connected to each other, in a plurality of cycles;
- a monitoring assembly configured to measure a voltage or current of the plurality of battery modules in a fully charged state, in every cycle;
- and
- a controller configured to, in every cycle:
- change the number of battery cells included in the plurality of battery modules and connected to each other,
- receive a measurement value for the voltage or current of the plurality of battery modules measured by the monitoring assembly,
- estimate a state of charge (SOC) of each of the plurality of battery modules based on the received measurement value,
- calculate a SOC change amount by comparing the estimated SOC of each of the plurality of battery modules with a preset reference value, and
- diagnose a state of the plurality of battery modules based on the calculated SOC change amount and the changed number of battery cells included in the plurality of battery modules.
A method for diagnosing a state of a battery pack, comprising:
- a charging and discharging step of discharging and charging a plurality of battery modules having a plurality of battery cells connected to each other, in every cycle;
- a monitoring step of measuring a voltage or current of the plurality of battery modules in a fully charged state;
- a SOC estimating step of estimating a SOC of each battery module based on the voltage or current measured in the monitoring step;
- a SOC change amount calculating step of calculating a SOC change amount by comparing the estimated SOC of each battery module with a preset reference value;
- and
- a diagnosing step of diagnosing a state of the plurality of battery modules based on the calculated SOC change amount.
Dependencies are inferred from the claim text.