| CPC H02J 7/0024 (2013.01) [G01R 31/3648 (2013.01); G01R 31/3835 (2019.01); H02J 7/0014 (2013.01)] | 10 Claims |
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1. A charging method for charging a plurality of serially connected battery cells in a charger, the method comprising Step 1 to Step 14, wherein
Step 1 comprises setting a charging voltage/current to the charger;
Step 2 comprises charging the serially connected battery cells by the charger;
Step 3 comprises starting a Total Voltage Follow-up Procedure (TVFP);
Step 4 comprises:
BMS checking a total voltage of the serially connected battery cells;
in response to determining that the total voltage is greater than or equal to a Target Voltage (TV), proceeding to Step 5; and
otherwise, returning to Step 2;
Step 5 comprises:
calculating an Average Battery Cell Voltage (ABCV) for the serially connected battery cells, by dividing the total voltage of the serially connected battery cells by the number of the serially connected battery cells; and
setting an Equalizing Trigger Voltage (ETV) based on the ABCV;
Step 6 comprises:
checking each battery cell voltage;
in response to determining that the battery cell voltage is greater than or equal to the ETV, proceeding to Step 7; and
otherwise, returning to Step 4;
Step 7 comprises starting an Equalizing Procedure for Battery Cells, by discharging specific battery cells having the battery cell voltage greater than or equal to the ETV;
Step 8 comprises:
checking all battery cell voltages of the battery cells;
in response to determining that all battery cell voltages are below the ETV, proceeding to Step 9; and
otherwise, returning to Step 7;
Step 9 comprises:
checking a Minimum Battery Cell Voltage (MBCV);
in response to determining that the MBCV is smaller than a predetermined Battery Cell Voltage Low Limit (BCVLL), proceeding to Step 10; and
otherwise, returning to Step 8;
Step 10 comprises starting an Artificial Intelligent Equalizing Procedure (AIEP);
Step 11 comprises:
checking:
(1) whether the total voltage is greater than a predetermined Total Voltage Low Limit (TVLL),
(2) whether the MBCV is smaller than a predetermined Battery Cell Voltage Low Limit (BCVLL), and
(3) whether a maximum battery cell voltage is greater than a predetermined Battery Cell Voltage High Limit (BCVHL);
in response to determining that (1), (2) and (3) are satisfied, proceeding to Step 12; and
otherwise, returning to Step 3;
Step 12 comprises setting an AI Equalizing Trigger Voltage (AIETV) based on the BCVHL;
Step 13 comprises discharging specific battery cells having the battery cell voltage greater than or equal to the AIETV, until all battery cell voltages are below the AIETV; and
Step 14 comprises:
checking a Battery Cell Voltage Difference (BCVD) being the maximum battery cell voltage minus the MBCV;
in response to determining that the BCVD is smaller than a predetermined Voltage Difference Setting Value (VDSV), returning to Step 3; and
otherwise, returning to Step 11.
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