Patent ID: 11959971
Assignee: LG ENERGY SOLUTION, LTD.
Field: Measurement (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. 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.