Dyness B4850 - Battery Management System (BMS); BMS Protection Functions

18-Introduction
2.5 Battery Management System (BMS)
2.5.1 VoltageProtection
Low Voltage Protection in Discharging: Whenanybatterycellvoltageortotal
voltageislowerthantheprotectionvalueduringdischarging,theover-discharging
modeisactivated,andthebatterybuzzermakesanalarmsound.Thenbattery
systemstopssupplyingpowertotheoutside.Whenthevoltageofeachcellbackto
ratedreturnrange,theprotectionisover.
Over Voltage Protection in Charging: Batterywillstopschargingwhentotal
voltageoranybatterycellvoltagereachestheratedprotectionvalueduring
chargingstage.Whentotalvoltageorallcellbacktoratedrange,theprotectionis
over.
2.5.2 CurrentProtection
Over Current Protection in Charging: Whenthechargecurrent>45A,current
limitprotectionmodeisactivated,currentwillbelimitedto4A,protectionisremoved
afterratedtimedelaying10S.Circulatelikethisuntilthecurrentislowerthan45A.
Over Current Protection in Discharging: Whenthedischargingcurrentisgreater
thantheprotectionvalue55A,thebatterybuzzeralarmsandthesystemstops
discharging.Protectionisremovedafterratedtimedelaying1min.
Caution: Thebuzzersoundalarmsettingcanbemanuallyturnedoffonthe
backgroundsoftware,andthefactorydefaultison.
2.5.3 TemperatureProtection
Low/Over temperature protection in charging: Whenbattery’stemperatureis
beyondrangeof-5°C~+55°Cduringcharging,temperatureprotectionisactivated,
devicestopscharging.
Theprotectionisoverwhentemperaturebacktoratedworkingrange.
Low/Over temperature protection in discharging: Whenbattery’stemperature
isbeyondrangeof-20°C~+55°Cduringdischarging,temperatureprotectionis
activated,devicestopssupplyingpowertotheoutside.
Theprotectionisoverwhentemperaturebacktoratedworkingrange.
2.5.4 OtherProtection
Short Circuit Protection: Whenthebatteryisactivatedfromtheshutdownstate,if
ashortcircuitoccurs,thesystemstartsshort-circuitprotectionfor60seconds.
Self-Shutdown: Whendeviceconnectsnoexternalloadsandpowersupply
andnoexternalcommunicationforover72hours,devicewilldormantstandby
automatically.
Caution: Battery’smaximumdischargingcurrentshouldbemorethanload’s
maximumworkingcurrent.