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US 11,959,971 B2Granted
Method and system for detecting connection fault of parallel connection cell
AssigneeLG Energy Solution, Ltd.
InventorJeong Wan Kim
Life of this patent
Estimating the term…
Abstract
Disclosed is a method and system for detecting connection failure of a parallel connected cell that provides improved accuracy by first detecting the cell connection failure due to the current interruption device (CID) operation of the battery or opening the parallel connection line for a battery that is being discharged by the operation of an external device, and confirming the first detection result through Direct Current Internal Resistance (DCIR) measurement for the battery.
Claims10
A method of detecting connection failure of a parallel connection cell, the method comprising:
- a reference data acquisition step of acquiring reference data when a cell connection failure occurs by generating a current interruption device (CID) operation or a parallel connection line open condition in a battery being discharged;
- a monitoring step of monitoring actual driving discharge data generated on the battery being discharged by an operation of an external device;
- a cell connection failure first detection step of comparing, from an actual driving discharge data monitored in the monitoring step, whether there is a section in the actual driving discharge data matching the amount of change in a discharge voltage value due to the CID operation or the open parallel connection line in the reference data and first detecting whether a cell connection failure occurs due to the CID operation or the open parallel connection line in the corresponding battery according to a comparison result;
- and
- a cell connection failure final detection step of finally confirming whether a result of the first detection is correct,
- wherein the reference data acquisition step comprises:
- a driving discharge reference data acquisition step of measuring the discharge voltage value at a predetermined periodic interval while discharging a predetermined reference battery connected to the external device through an operation of the external device, and acquiring driving discharge reference data based on the measured discharge voltage value;
- a connection failure time point reference data acquisition step of acquiring connection failure time point reference data generated accordingly due to the CID operation or the open parallel connection line at a predetermined time point while the driving discharge reference data acquisition step is in progress,
- wherein the driving discharge reference data is a change amount of the discharge voltage value for the reference battery, and
- wherein the connection failure time point reference data is an amount of change in the discharge voltage value caused by the CID operation or the open parallel connection line with respect to the reference battery.
7 more elements
A connection failure detection system of a parallel connection cell, the system comprising:
- one or more batteries including at least one or more cells connected in parallel;
- a voltage measurer configured to measure a discharge voltage of a battery at predetermined periodic intervals;
- a monitor configured to monitor actual driving discharge data derived as an analog signal in a waveform form based on the discharge voltage value measured by the voltage measurer;
- a memory configured to store reference data for detecting whether a cell connection failure occurs due to a current interruption device (CID) operation or an open parallel connection line in the battery;
- a cell connection failure first detector configured to detect whether there is a section matching the amount of change in the discharge voltage value due to the CID operation or the open parallel connection line of the reference data in the actual driving discharge data monitored by the monitor using the reference data stored in the memory and first detect whether a cell connection failure occurs due to the CID operation or the open parallel connection line in the corresponding battery;
- and
- a cell connection failure final detector configured to finally detect whether a cell connection failure due to the CID operation or the open parallel connection line occurs in the corresponding battery by checking whether the result of the first detection as being in a cell connection failure state is correct through the cell connection failure first detector,
- wherein the reference data stored in the memory is configured to include final connection failure detection reference data, and
- wherein the final connection failure detection reference data is the amount of change in the discharge voltage value of the battery that occurs when the CID operates or the parallel connection line is opened.
6 more elements
Dependencies are inferred from the claim text.