EV 101 Class by Electric Vehicle
Product Information
The Dilithium BMS 2.2 is a battery management system designed
for use with various compatible battery modules, including Tesla
5.3kWh, Smart, LG Chem, Samsung, and Panasonic. The BMS has several
common settings that can be adjusted to optimize the performance
and lifespan of your battery pack.
HVC – High Voltage Cutoff
This setting determines the voltage at which the BMS goes into
High Voltage Alert. It is recommended to set this value at or
slightly above your charge voltage. For example, if your charge
voltage is 4.15V, you should set the HVC between 4.15-4.20
Volts.
LVC – Low Voltage Cutoff
This setting determines the voltage at which the BMS goes into
Low Voltage Alert. It is recommended to set this value at or
slightly above your discharge voltage. While many chemistries list
a discharge floor of 3.0-3.2 Volts, setting the LVC to 3.30 Volts
provides a more conservative approach and helps prolong the pack’s
lifespan with less degradation.
HVCC – High Voltage Cutoff Clear
This setting determines the voltage at which the High Voltage
Cutoff Alert is cleared. The voltage needs to drop below this value
for the alert to be cleared. Typically, this is set 0.05 Volts
below your HVC value.
LVCC – Low Voltage Cutoff Clear
This setting determines the voltage at which the Low Voltage
Cutoff Alert is cleared. The voltage needs to rise above this value
for the alert to be cleared. Typically, this is set 0.05 Volts
above your LVC value.
HVCDELAY – High Voltage Alarm Delay
This setting determines the duration in seconds that the HVC
Alert is suppressed. It is useful during periods of brake regen
that might briefly cause the voltage to go above the HVC value when
the state of charge is high. A 10-second delay allows the alarm to
function effectively during charging while filtering regen high
voltages.
LVCDELAY – Low Voltage Alarm Delay
This setting determines the duration in seconds that the LVC
Alert is suppressed. It is useful during periods of hard
acceleration that might briefly cause the voltage to fall below the
LVC value when the state of charge is low. A 10-second delay allows
the alarm to function effectively for discharge values while
filtering short periods of hard acceleration and temporary voltage
sag.
BVMIN – Balancing Voltage Minimum
This setting determines the voltage at which the BMS will stop
the balance discharge function once the cells drop below this
value. It prevents a total discharge of the pack or loss of range
at a lower state of charge. Typically, this is set just below
nominal voltage to ensure balancing won’t occur in the bottom 40%
of the pack.
THMAX – Thermistor Maximum
This setting determines the maximum temperature in degrees
Celsius at which the thermistors will trigger an alert. The default
value is 50 degrees Celsius.
BVC – Balance Voltage Cutoff
This setting tapers the charge current from the EVCC to the
Charger. It is recommended to leave this in the default
setting.
Product Usage Instructions
- Read the Dilithium Designs BMS 2.2 Manual thoroughly before
using this guide. - Review the recommended settings for each parameter based on
your specific battery module. - Adjust the HVC, LVC, HVCC, LVCC, HVCDELAY, LVCDELAY, BVMIN, and
THMAX values according to your requirements. - Ensure the balancing function and thermistors are enabled.
- Lock the configuration to receive an alert if any of the LTCs
fail to report. Use the command “enable balance” to lock the
configuration.
Dilithium BMS 2.2 Common Settings – Quick Start
Settings are for a 3.30V-4.20V Chemistry Compatible Modules Include Tesla 5.3kWh, Smart, LG Chem, Samsung, Panasonic
This is a quick refererence guide to the most common settings for our most commonly used battery modules. This is not a replacement for the Dilithium Designs BMS 2.2 Manual, and you must fully read the manual before using this guide.
HVC – High Voltage Cutoff = 4.15-4.20 Volts
This is the voltage at which the BMS goes into High Voltage Alert. You want this to be at or slightly above your charge voltage, so if you are more conservative with your charge voltage (4.15V) then the HVC should reflect that setting.
LVC – Low Voltage Cutoff = 3.30-3.35 Volts
This is the voltage at which the BMS goes into Low Voltage Alert. You want this to be at or slightly above your discharge voltage of your cell, so while many chemistries will list 3.0 to 3.2 Volts for the disharge floor, we like 3.30 Volts as it’s a little more conservative and will help your pack last longer with less degradation.
HVCC – High Voltage Cutoff Clear = 4.10-4.15 Volts
This is the voltage at which the High Voltage Cutoff Alert is cleared, so the voltage needs to drop below this value. We typically set this for 0.05 Volts below your HVC value.
LVCC – Low Voltage Cutoff Clear = 3.35-3.40 Volts
This is the voltage at which the Low Voltage Cutoff Alert is cleared, so the voltage needs to rise above this value. We typically set this for 0.05 Volts above your LVC value.
HVCDELAY – High Voltage Alarm Delay = 10 Seconds
This is the time in Seconds that the HVC Alert is supressed. This is useful during periods of brake regen that might briefly cause the voltage to go above the HVC value when the state of charge is high. By having a 10 Second delay, this allows the alarm to function well for charging while also filtering regen high voltages.
LVCDELAY – Low Voltage Alarm Delay = 10 Seconds
This is the time in Seconds that the LVC Alert is supressed. This is useful during periods of hard acceleration that might briefly cause the voltage to fall below the LVC value when the state of charge is low. By having a 10 Second delay, this allows the alarm to function well for discharge values, while filtering short periods of hard acceleration and temporary voltage sag.
BVMIN – Balancing Voltage Minimum = 3.60 Volts
This is the voltage at which the BMS will stop the balance discharge function once the cells drops below this value. This prevents a total discharge of the pack, or loss of range at a lower state of charge. Typically we set this just below nominal voltage to balancing won’t occur in the bottom 40% of the pack.
THMAX – Thermistor Maximum = 50 Degrees Celsius
This is the temperature at which the over-temperature fault is set. Most battery chemistries can operate up to 60° Celsius, but we like to be more conservative and under normal conditions the batteries should be kept below 50° Celcius.
BVC – Balance Voltage Cutoff = Default Setting
This is to taper the charge current from the EVCC to the Charger. We leave this in the default setting.
When finished setting up your values, don’t forget to enable the balancing function, the thermistors, and lock the configuration. Locking the configuration will cause an alert if any of the LTCs fail to report. This can be done with the following commands: enable balance
enable thermistor lock
