836kWh Liquid Cooled Battery Storage Cabinet (eFLEX BESS)
AceOn's Flexible Energy Storage Solution
AceOn's eFlex 836kWh Liquid-Cooling ESS offers a breakthrough in cost efficiency. Thanks to its high energy density design, eFlex maximizes the energy stored per unit of space, drastically reducing land and construction costs. Besides, eFlex delivers unmatched flexibility with Its modular design supporting parallel connection of 6-8 cabinets (maximum capacity of 6,688 kWh) and its adaptive Rack architecture allowing the removal of up to 6 packs (single-cabinet capacity down to 520 kWh). Engineered for versatility, eFlex empowers cost-optimized energy solutions tailored to your operational requirements.
Technical Specifications
Complete technical details and specifications for the 836kWh eFLEX BESS Liquid Cooled Battery Storage Cabinet system.
| Parameter | Specification |
|---|---|
| System Model | BESS-MSI-7622 |
| System Information | |
| Nominal AC Power | 418kW |
| Nameplate Capacity | 836kWh |
| Battery Information | |
| Battery Chemistry | LFP |
| Battery Capacity | 314Ah |
| Configuration | 416S2P |
| Nominal Voltage | 1331.2V |
| Voltage Range | 1123.2~1497.6V |
| Working Conditions | |
| Degree of Protection | IP55 |
| Noise Emission | ≤72dB |
| Operating Temperature Range | -30°C~55°C (-40°C~55°C optional) |
| Relative Humidity | 0~100%RH |
| Max Working Altitude | 4000m |
| System Information | |
| Dimensions(WxHxD) | 2000x2470x1720mm |
| Weight | ≤8t |
| Cooling Method | Intelligent Liquid Cooling |
| Aux. Power Supply | AC400V/3PAL 50Hz |
| Fire Suppression System | Dry pipe, Gas detection and Ventilation, Aerosol, Alarm System |
| Certificate | IEC62619, IEC63056, IEC60730, IEC62477, IEC61000 |
Enhance Energy Density and Space Utilization
Industrial facilities and urban areas often struggle to find space for large-scale energy storage solutions.
The eFlex 836kWh system is designed to fit into even the most compact spaces. With an energy density of 98.4kWh/m³ and a footprint of just 3.44㎡, it offers a high-performance solution that maximizes space utilization without sacrificing storage capacity.
Reliable Environmental Adaptability
Extreme temperatures can affect the reliability and performance of energy storage systems, making them unsuitable for diverse environmental conditions.
The eFlex 836kWh system operates seamlessly in temperatures ranging from -40°C to 55°C, ensuring reliability in harsh climates. Its liquid cooling technology guarantees optimal performance even in confined spaces, making it ideal for both large industrial facilities and smaller public utility deployments.
Flexible and Scalable Energy Storage
A one-size-fits-all approach doesn't work for every project. You need scalable and customisable energy storage solutions that fit your specific needs.
The eFlex 836kWh system offers unmatched flexibility. With the ability to connect up to 6 packs, it can easily scale from 520kWh to 836kWh, meeting the demands of a variety of projects. Whether you're deploying small public utility installations or large industrial systems, the modular design ensures optimal energy storage at any scale. This flexibility enables you to tailor the system to your exact requirements, ensuring maximum efficiency and reliability across different applications.
Comprehensive Safety and Certifications
Energy storage systems must meet stringent safety standards and regulations to ensure reliability.
The eFlex 836kWh system meets global safety standards, including UL1973, UL9540, UL9540A, IEC 62619, IEC 63056, IEC 62477-1, IEC 61000-6-2/-4, NFPA 68/69, and CE certifications. Equipped with MSD fuses and intelligent Battery Management Units (BMUs), it delivers a safe and stable energy storage solution for even the most demanding environments.
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 314Ah prismatic cells became AceOn's best pick for a battery storage solution.
Advanced features of cells are:
- Lower fire risk, no explosion risk, higher safety
- Advanced thermal dissipation design
- Active protection: short circuit, over-charging, over-discharging, high temperature, extrusion, and other safety features
- Safety Vent (in the middle of 2 pole of cell)
- Metal protected against corrosion, be made of alumimum
- Self-discharge rate：Per month ≤3.0%
Battery Module
Battery Modules are formed by configuring 52 LFP cells in a series connection. The modular design enables customized configurations, ease of maintenance, and future expandability. Each battery module is equipped with a battery management system (BMU) to form a rack-mountable module assembly. Multiple module assemblies are then connected in series to form a battery rack. Each battery rack contains a rack-level BMS.
The positive (+) and negative (-) terminals of the battery modules are clearly marked and are designed for the convenience of connection, visual check, examine, and repair.
The external casing is made of metal covered by insulating materials. For example, the top cover is made of PP, the bottom base is made of aluminum. The copper bars and screws are connected internally to prevent short circuit to ensure the electrical safety of the battery module. Each battery module has 8 temperature detectors.
Battery Cabinet & Management System
Battery Cabinet
There are 2 racks that fit in a single battery cabinet, 9 slots in each battery rack to accommodate 8 battery modules and total 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 easy installation and maintenance.
Configuration: Since each battery rack hosts 8 battery modules and each battery module has 52 battery cells, each battery Rack has a total of 416 battery cells connected in series.
In addition to battery cells, there are switch-disconnectors, contactors, sensors, sampling lines, battery management systems, as well as control units being integrated into the same battery rack.
Battery Management System
BESS employs a sophisticated, multilevel battery management system (BMS) for system monitoring and control. Each battery management system including:
- Module Battery management unit (BMU)
- Rack Battery Management controlling System (RBMS)
- System-level BMS (SBMS)
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.
BMS Units System Architecture
BMS Major Functionality
The table below outlines BMS units of the system.
| FUNCTIONALITY | BMU | RBMS | SBMS |
|---|---|---|---|
| Measurement | |||
| Cell Voltage | √ | ||
| Cell Temperature | √ | ||
| Rack Voltage | √ | ||
| Rack Current | √ | ||
| Calculation | |||
| SOC | √ | √ | |
| SOH | √ | √ | |
| Power Prediction | √ | ||
| Control | |||
| Contactor Control | √ | ||
| Cell Balancing | √ | √ | |
| Communication | |||
| CAN2.0 | √ | √ | |
| RS485 | √ | ||
| Ethernet | √ | ||
Battery Connection Panel
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 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 of the battery system (include battery BMS, cooling units, BCP, PCS etc.)
Offer a universal interface for communication between battery systems and SCADA or EMS.
Supports RS-485, CAN, dry contact, Ethernet communication and easy integration
Data logging (short period) for trouble shooting
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 |
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 of the battery system (include battery BMS, cooling units, BCP, PCS etc.)
Offer a universal interface for communication between battery systems and SCADA or EMS.
Supports RS-485, CAN, dry contact, Ethernet communication and easy integration
Data logging (short period) for trouble shooting
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
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 - 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.
Advantages of Aerosol Fire Extinguishers
Higher performance than gas while using the same weight of the agent
No pressurized vessels, pipes or other expensive components required
Almost maintenance-free operation
Service life of over ten years
Minimal size and weight for easy installation
Highly cost-effective solution for fire prevention