Basic introduction
The Smart Li-ion BMS is suitable for lithium iron phosphate battery communication backup power supply, can provide over-charge, over-discharge, over-current, over-temperature, under-temperature, short-circuit and reverse connection protection for the battery pack, and also provide voltage equalization in the charging process; it can be used to realize reliable multi-group parallel connection and communicate with the upper computer through the CAN bus or RS485, and the maximum number of parallel connection groups is 32 groups. Parameter configuration, data monitoring and software upgrading can be carried out on the software of the upper computer. Intelligent Li-ion BMS is compatible with 15-series and 16-series Li-ion battery packs.
Intelligent Li-ion BMS is divided into two parts, BMU and BDC, BMU (Battery Management Unit) realizes voltage and temperature monitoring of single cell, SOC calculation, operation logic strategy control, parameter setting, external communication, etc. BDC (Bidirectional Direct Current Converter) is a system that connects the battery pack with the battery pack. BDC (Bidirectional Direct Current Converter) is a bi-directional DC converter circuit between the battery pack and the main circuit of the communication backup power supply, which is used to carry out the functions of constant current, constant voltage charging and discharging as well as standby and protection of the battery.
Overall structure
●Bidirectional current limiting function, current limiting value can be set;
●Constant voltage 44-57V discharge mode can be realized;
●Rectifier module adopts CNC soft-switching technology, with peak efficiency up to more than 98.5%;
●DCDC and BMS are highly integrated, realizing low cost and high performance;
●Integrated perfect battery management (collection, protection, equalization).
System Components
Product Advantages
Product Characteristics
Integrated BMS + bi-directional DCDC, realizing intelligent management of Li-ion battery charging and discharging.Support lead-acid and lithium mixed use, boost charging
Intelligent design
With Bluetooth APP, wireless 4G communication, parallel online upgrade, gyroscope, anti-theft and other extended function interface.
Multiple operation modes
Self-managed constant-voltage discharge, power-managed constant-voltage discharge, battery characteristic,Discharge and peak shaving four modes.
Discharge characteristics
Support constant voltage discharge, discharge current equalization, discharge voltage can be set to realize remote power supply, seamless charging/discharging switching, etc.
Parallel power expansion
Supports up to 32 groups of batteries in parallel, with peak efficiency up to 98.5%.
Easy maintenance
Supports multiple activation methods, forced power-down function, and maintenance mode to automatically align addresses with physical locations.
Battery mode
Battery Characterization Mode
The Smart Li-ion BMS module outputs according to the characteristic discharge curve of the battery, i.e. the output voltage of the intelligent Li-ion battery is equal to the battery voltage. This mode is similar to the common Li-ion BMS, but the charging and discharging overcurrent will start DCDC for current limitation instead of direct overcurrent protection. This mode can be connected in parallel with lead-acid batteries to support synchronized discharge.
Self-managed constant voltage discharge mode
1. It is mainly used for parallel connection with lead-acid batteries and lithium iron phosphate batteries (including ladder batteries).
2. Intelligent lithium battery enters the constant voltage discharge state according to the change of power system bus voltage, which can realize the priority discharge of intelligent lithium battery for main use.
Power Management Mode
1. It can realize constant voltage discharge, turn discharge to the set value of power supply constant voltage to maintain the output (48V-57V can be set);
2. Mainly used for peak shaving and valley filling scenarios, realizing intelligent staggered power consumption.
3. Enhance the power supply capacity of site pulling far away.
System parameter
Protective Function
Parallel Function
1, The Smart Li-ion BMS supports parallel application, synchronously increase the backup time or backup power: the maximum power of a single battery module 4.8kW, parallel support for the maximum 32 groups.
2、By entering the maintenance mode function, it can meet the situation that the battery of the existing network is not powered down, and expand the capacity of the system online, and guarantee that the battery will not go down in the process of expanding the capacity due to utility blackout and down station.
3、In the discharge mode, the average current imbalance between modules is ≤5%.
Efficiency Graph
Application Scenario Examples
Zhejiang Tower Application Scenario Case Sharing
Cutting the peaks and filling the valleys:
1. Configure the energy storage to discharge continuously for 6 hours;
2. The minimum backup time after energy storage discharge is not less than 3 hours or the depth of discharge is not higher than 90%;
System Configuration:
1, the configuration of six 48V100ah intelligent lithium (power management mode), a wireless transmission unit, a meter, a shunt.
2, charger DC voltage configuration (55.2V).
3、The information of energy storage monitoring should be provided to A and B at the same time;
Hefei Tower Application Scenario Case Sharing
Normal lithium batteries are mixed with smart lithium batteries:
System Configuration:
1, charger DC voltage (54.6V).
2, the site configuration of two 48V200ah ordinary lithium-ion and two 48V100ah intelligent lithium-ion (self-management with temperature compensation mode)
Self-management model:
1. When connected in parallel, the intelligent lithium battery enters the constant voltage discharge state according to the change of power system bus voltage, realizing that the intelligent lithium battery has priority to be discharged for main use when the utility power goes out;
2、The minimum backup time after energy storage discharge is not less than 3 hours or the depth of discharge is not higher than 90%;
Low-voltage intelligent lithium home storage application scenarios sharing
stacked
1. Fully automatic distribution type, each battery can be stacked randomly.
2、Fixed half-distribution type for host, slave batteries stacked at will, single parallel supports up to 32 groups, cluster parallel supports up to 16 groups.
3、One-key startup function/cluster SOC display
Color display, 4.3inch/7inch
WIFI/Bluetooth type: Bluetooth near-end, WIFI far-end connected to the cloud platform
Support all mainstream inverter protocol communication
Key words:
Smart Li-ion BMS, Intelligent Li-ion BMS
