344kWh Battery Storage Cabinet (eFLEX BESS)
AceOn offer a liquid cooled 344kWh battery cabinet solution. The ultra safe Lithium Ion Phosphate (LFP) battery cabinet can be connected in parallel to a maximum of 12 cabinets therefore offering a 4.13MWh battery block. The battery energy storage cabinet solutions offer the most flexible deployment of battery systems on the market.
Technical Specifications
Complete technical details and specifications for the 344kWh eFLEX BESS Liquid Cooled Battery Cabinet system.
| Parameter | Specification |
|---|---|
| System Information | |
| System Model | BESS-MSI-7605.5 | BESS-MSI-7605 |
| Max. Power | 172kW | 344kW |
| Nameplate Energy | 344kWh |
| Battery Information | |
| Battery Chemistry | LFP |
| Capacity | 280Ah |
| Configuration | 384S1P |
| Nominal Voltage | 1228.8V |
| Voltage Range | 1075.2-1382.4V |
| Working Conditions | |
| Degree of Protection | NEMA 3R / IP55 |
| Noise Emission | ~75dB@1M |
| Operating Temperature Range | -22°F~122°F / -30°C~50°C |
| Relative Humidity | 0~95% (No condensing) |
| Max. Working Altitude | 6,500ft/2,000m |
| General Information | |
| Dimensions(W×H×D) | 1300×2460×1300mm |
| Weight | 3,500kg |
| Cooling Method | Liquid Cooling |
| Fire Suppression System | Aerosol |
| Certificate | IEC62619, UL1973, UL9540A |
Download Full Datasheet
Get the complete technical documentation including detailed drawings, installation guidelines, and performance specifications.
Download Complete Datasheet PDF →Maximum System Flexibility
344kWh battery cabinet can be connected together in blocks of 12 with a Battery Connection Panel to create a 4.13MWh Battery Block which connects to a PCS or Inverter
Battery Cell
AceOn's battery storage systems rely on advanced LFP chemistry to provide a combination of high-power performance, low cost, and industry-leading safety. Flexible configuration to serve application scenarios, 3.2V 280Ah prismatic cells became AceOn's best pick for a battery storage solution.
Advanced Features
Advanced features of cells are:
Battery Module
Customised Configurations
Flexible design allowing for tailored system configurations
Ease of Maintenance
Simplified serviceability and component accessibility
Future Expansion
Scalable architecture for growing energy requirements
Modular System Architecture
Modular design which allows for customized configurations, ease of maintenance, and future expansion capability. Modules are formed by configuring 48 of LFP cells in series connection. Modules connected with a battery management system (BMU) to form a rack-mountable module assembly. Multiple module assemblies are then combined into a rack. Each rack contains rack-level BMS.
Connection & Safety Features
The positive and negative interface of the battery modules are provided with obvious marks, are convenient to connect, visual check, examine and repair; The positive sign of the battery module is "+" and the negative sign is "-". The external contact surface of the battery module is covered by insulating material(Metal protected against corrosion, the top cover is made of PP, the bottom is made of aluminum), the copper bar and screws are connected internally to prevent short circuit to ensure the electrical safety of the battery module. Each battery module has 16 temperature detectors.
Module Specifications
Battery Rack
There are 9 slots in each battery rack to accommodate 8 modules and 1 BSPU (Battery Switch & Protective Unit). Racks are connected in parallel and paired with a system BMS to meet the power and energy requirements of the application at hand. All wire connections are placed on the front side of the rack to allow for easy installation and maintenance.
Comprehensive System Components
Each battery Rack is with 384 battery cells in series with switch-disconnector, contactor, detective unit, sampling line, battery management systems, control unit, etc.
Battery Management System
Each battery Rack is with 384 battery cells in series with switch-disconnector, contactor, detective unit, sampling line, battery management systems, control unit, etc.
Module Battery management unit (BMU)
Cell-level voltage and temperature detection with balance functions
Rack Battery Management controlling System (RBMS)
Manages all module BMS units and executes protection functions
System-level BMS (SBMS)
Manages rack BMS units and communicates with PCS or EMS
At the lower level is the Module BMS (BMU), which is designed to detect voltage, temperature, and execute cell balance functions for cells. The rack BMS (RBMS) can manage all module BMS units and detects total voltage, current, and executes protection functions by switching DC-contactor. Finally, a system-level BMS (SBMS) manages rack BMS units and communicates with PCS or EMS. The table below outlines BMS units of the system.
Architecture of System BMS
BMS Functionality
| FUNCTIONALITY | BMU | RBMS | SBMS |
|---|---|---|---|
| Measurement | |||
| Cell Voltage | ✓ | ||
| Cell Temperature | ✓ | ||
| Rack Voltage | ✓ | ||
| Rack Current | ✓ | ||
| Calculation | |||
| SOC | ✓ | ✓ | |
| SOH | ✓ | ✓ | |
| Contactor Control | ✓ | ||
| Control | |||
| Cell Balancing | ✓ | ✓ | |
| Communication | |||
| CAN2.0 | ✓ | ✓ | |
| RS485 | ✓ | ||
| Ethernet | ✓ |
Battery Connection Panel
Battery Connection Panel (BCP) is a piece of crucial equipment in our BESS design. It serves several functions in the system:
BCP System Functions
Battery Combiner
The main function of the BCP is to combine multiple racks of batteries to one DC bus, then connect to the DC input of PCS with necessary protections. With SPDs, the BCP serves as a key part of battery protections.
Auxiliary Power Supply
With input connections, switches, connectors, UPS, and auxiliary power connection to the auxiliary loads (BMS, module fans, HVAC, FSS, etc.), BCP as acting as an auxiliary power panel to power internal equipment.
Communication Combiner
Through the connections to the BMS, HVAC, FSS, and other internal equipment, then combine them to the System Controller for control integration, the BCP also serves as a communication combiner and sometimes as a protocol adaptor.
Battery Connection Panel
BCP Core Capabilities
Battery System Controller
To offer a universal interface for communication between battery systems and SCADA or EMS and release EMS from basic system protection, AceOn deploys a system controller as part of the BESS integration.
Control Integration
Control integration of the battery system (include battery BMS, cooling units, BCP, PCS etc.)
Universal Interface
Offer a universal interface for communication between battery systems and SCADA or EMS.
Communication Support
Supports RS-485, CAN, dry contact, Ethernet communication and easy integration
Data Logging
Data logging (short period) for trouble shooting
Remote Firmware Update
Remote firmware updating
Specification of Battery System Controller
| ITEM | SPECIFICATION |
|---|---|
| Power Supply | DC 12~24V |
| Total Power Consumption | < 25W |
| Processor | Cortex-A53 |
| Frequency | 1.1GHz |
| M.2 SSD | 1 channel, 256GB |
| Operating System | Ubuntu-20.04 |
| RS485 | 8 channels, baud rate 1200bit/s, 2400bit/s, 4800bit/s, 9600bit/s, 19200bit/s, 38400bit/s, 115200bit/s |
| RS232 | 3 channels, baud rate 1200bit/s, 2400bit/s, 4800bit/s, 9600bit/s, 19200bit/s, 38400bit/s, 115200bit/s |
| Ethernet | 4 channels 1000M adaptive |
| CAN | 3 channels |
| TF Card Interface | 1 channel |
| USB Host | 2 channels |
| State Input | 18 channels, Input circuit adopts opt coupler isolation |
| Passive Dry Contact | 8 channels, Output circuit adopts relay isolation |
| RTC Clock | Yes |
| Independent Hardware Watchdog | Yes |
| Communication Protocol | Modbus-RTU, Modbus-TCP |
| Operating Temperature Range | -30°C ~ +60°C |
| Dimensions (W×H×D) (mm) | 232×59×113.2 |
| Relative Humidity | 0~65% (noncondensing) |
| Cooling Concept | Natural Air |
| Installation Method | Wall mount or rail mount |
Liquid Cooling System
The liquid cooling system is small in size and equipped on each rack.
Advantages of Liquid Cooling
Higher cooling capability
compare to air cooling, liquid cooling is capable of taking more heat away from batteries under the same condition. And liquid cooling is the best choice when thermal density is beyond the capability of air cooling.
Better temperature uniformity
Cooling liquid has a specific heat capacity which leads to a smaller temperature rise during the cooling process. Therefore, battery cells will have a smaller temperature difference with liquid cooling.
Lower Noise Emission
Without fans on battery modules for air cooling means no noise emission from battery modules.
Working principle of Liquid Cooling
Working principle of Liquid Cooling
Battery Cooling
Cooling liquid powered by the pump will circulate inside battery modules and take the heat from batteries. When the liquid gets out of the battery modules, it became hot liquid with the heat from batteries. The hot liquid will circle back to a heat exchanging tank.
Heat Exchanging
Inside the heat exchange tank, the refrigerant will vaporize from liquid state to gaseous state. During this state/phase change process, the refrigerant will absorb a huge amount of heat from the battery cooling liquid and cool down the cooling liquid.
AC Cooling
The rest of the system is a standard Air Conditioner which releases the heat to the environment through the phase change of the refrigerant.
Fire Suppression and Detection System
Type of Fire Protection
The outdoor cabinet has a separate and relatively sealed space. According to the working principle of the energy storage system and other related technical characteristics, aerosol fire extinguishers and smoke detectors are installed. The fire extinguisher will automatically release aerosols and send a signal to the control panel when the internal temperature reaches 74 °C (162 °F). After releasing, the pressure sensor will send a signal to the Fire Control Panel to report the release event. In a separate loop, the smoke detector sends a signal to the control panel after sensing smoke. Smoke detection is normally reported before aerosol release. Upon receipt of either signal, the fire control panel sends an alarm to the fire mainframe and triggers a light and sound alarm.
Fire suppression system
Detection Components
Thermal Bulb: Activates at 74°C (162°F)
Smoke Detector: Early warning system
Pressure Sensor: Confirms aerosol release
Control Integration
Control Panel: Central monitoring hub
Fire Mainframe: System coordination
Strobe and Horn: Visual and audible alerts
Suppression Process
Open Actuator: Initiates release mechanism
Release: Aerosol deployment
Extinguishing: Fire suppression completion
Aerosol automatic fire extinguishers
When the temperature rises high enough, the extinguisher will automatically and efficiently generate and release an ultra-fine potassium-based aerosol with the assistance of a series of auxiliary components. With the collaboration of the patented design, the aerosol composition, and the ultra-fine particle size, the reaction between oxygen and combustible materials is greatly interrupted, thus ending the spread of flame. Compared to gas fire extinguishing systems, aerosol offers higher performance than gas while using the same weight of the agent. Aerosol extinguishers require no pressurized vessels, pipes or other expensive components, are almost maintenance-free, have a service life of over ten years, and have a minimal size and weight. All these advantages make aerosol fire extinguishers a highly cost-effective solution for fire prevention.
Higher Performance
Superior effectiveness compared to gas systems using same agent weight
Low Maintenance
Almost maintenance-free with 10+ year service life
Cost-Effective
No pressurized vessels or expensive components required