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Merge pull request #199 from dalathegreat/feature/tesla-float-charge

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Feature: Add top balancing for Tesla batteries
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Daniel Öster 2024-02-26 12:27:24 +02:00 • committed by GitHub
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2 changed files with 20 additions and 5 deletions
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22
Software/src/battery/TESLA-MODEL-3-BATTERY.cpp
View file

@ -156,9 +156,9 @@ static const char* hvilStatusState[] = {"NOT OK",
#define MIN_CELL_VOLTAGE_NCA_NCM 2950 //Battery is put into emergency stop if one cell goes below this value #define MIN_CELL_VOLTAGE_NCA_NCM 2950 //Battery is put into emergency stop if one cell goes below this value
#define MAX_CELL_DEVIATION_NCA_NCM 500 //LED turns yellow on the board if mv delta exceeds this value #define MAX_CELL_DEVIATION_NCA_NCM 500 //LED turns yellow on the board if mv delta exceeds this value
#define MAX_CELL_VOLTAGE_LFP 3520 //Battery is put into emergency stop if one cell goes over this value #define MAX_CELL_VOLTAGE_LFP 3550 //Battery is put into emergency stop if one cell goes over this value
#define MIN_CELL_VOLTAGE_LFP 2800 //Battery is put into emergency stop if one cell goes below this value #define MIN_CELL_VOLTAGE_LFP 2800 //Battery is put into emergency stop if one cell goes below this value
#define MAX_CELL_DEVIATION_LFP 150 //LED turns yellow on the board if mv delta exceeds this value #define MAX_CELL_DEVIATION_LFP 200 //LED turns yellow on the board if mv delta exceeds this value
#define REASONABLE_ENERGYAMOUNT 20 //When the BMS stops making sense on some values, they are always <20 #define REASONABLE_ENERGYAMOUNT 20 //When the BMS stops making sense on some values, they are always <20
@ -200,10 +200,22 @@ void update_values_battery() { //This function maps all the values fetched via
} }
//The allowed charge power behaves strangely. We instead estimate this value //The allowed charge power behaves strangely. We instead estimate this value
if (system_scaled_SOC_pptt == 10000) { // When scaled SOC is 100%, set allowed charge power to 0 if (system_scaled_SOC_pptt == 10000) { // When scaled SOC is 100.00%, set allowed charge power to 0
system_max_charge_power_W = 0; system_max_charge_power_W = 0;
} else if (soc_vi > 950) { // When real SOC is between 95-99.99%, ramp the value between Max<->0 } else if (soc_vi > 990) {
system_max_charge_power_W = MAXCHARGEPOWERALLOWED * (1 - (soc_vi - 950) / 50.0); system_max_charge_power_W = FLOAT_MAX_POWER_W;
} else if (soc_vi > RAMPDOWN_SOC) { // When real SOC is between RAMPDOWN_SOC-99%, ramp the value between Max<->0
system_max_charge_power_W = MAXCHARGEPOWERALLOWED * (1 - (soc_vi - RAMPDOWN_SOC) / (1000.0 - RAMPDOWN_SOC));
//If the cellvoltages start to reach overvoltage, only allow a small amount of power in
if (system_LFP_Chemistry) {
if (cell_max_v > (MAX_CELL_VOLTAGE_LFP - FLOAT_START_MV)) {
system_max_charge_power_W = FLOAT_MAX_POWER_W;
}
} else { //NCM/A
if (cell_max_v > (MAX_CELL_VOLTAGE_NCA_NCM - FLOAT_START_MV)) {
system_max_charge_power_W = FLOAT_MAX_POWER_W;
}
}
} else { // No limits, max charging power allowed } else { // No limits, max charging power allowed
system_max_charge_power_W = MAXCHARGEPOWERALLOWED; system_max_charge_power_W = MAXCHARGEPOWERALLOWED;
} }

3
Software/src/battery/TESLA-MODEL-3-BATTERY.h
View file

@ -7,6 +7,9 @@
#define BATTERY_SELECTED #define BATTERY_SELECTED
#define RAMPDOWN_SOC 900 // 90.0 SOC% to start ramping down from max charge power towards 0 at 100.00%
#define FLOAT_MAX_POWER_W 200 // W, what power to allow for top balancing battery
#define FLOAT_START_MV 20 // mV, how many mV under overvoltage to start float charging
#define MAXCHARGEPOWERALLOWED 15000 // 15000W we use a define since the value supplied by Tesla is always 0 #define MAXCHARGEPOWERALLOWED 15000 // 15000W we use a define since the value supplied by Tesla is always 0
#define MAXDISCHARGEPOWERALLOWED \ #define MAXDISCHARGEPOWERALLOWED \
60000 // 60000W we need to cap this value to max 60kW, most inverters overflow otherwise 60000 // 60000W we need to cap this value to max 60kW, most inverters overflow otherwise