CATL EnerC+ 306 4MWH Battery Energy Storage System Container


The EnerC+ 4MWH containeris a modular fully integrated product , consisting of rechargeable lithium-ion batteries, with the characteristics of high energy density, long service life, high efficiency. It can provide stable energy release for


The EnerC+ 4MWH containeris a modular fully integrated product , consisting of rechargeable lithium-ion batteries, with the characteristics of high energy density, long service life, high efficiency. It can provide stable energy release for over 2h when the batteries are fully charged. The EnerC+ Energy Storage product is capable of various on-grid applications, such as frequency regulation, voltage support, arbitrage, peak shaving and valley filling, and demand response.In addition, EnerC+ container can also be used in black start, backup energy, congestion managemet, microgrid or other off-grid scenierios.
enerc plus containerenerc+ container2
The EnerC+ container is a battery energy storage system (BESS) that has four main components: batteries, battery management systems (BMS), fire suppression systems (FSS), and thermal management systems (TMS). These components work together to ensure the safe and efficient operation of the container.


The capacity of cell is 306Ah, 2P52S cells integrated in one module, 8 modules integrated into one rack, 5 racksintegrated into one container. Asthe core of the energy storage system, the battery releases and stores energy


BMS adopts the distributed scheme, through the three-level (CSC--SBMU--MBMU) architecture to control the BESS, to ensure the stable operation of the energy storage system. It can manage energy absorption and release, the thermal management system and low voltage power supply according to the detected information: battery voltage, current and temperature. It can monitor high voltage DC/AC security, diagnosis and analysis faults according information from various detectors and dry-contacts. And it can keep communication with PCS and EMS through CAN. The BMS is the most important control unit of EnerC+ container. The BMS possesses the UPS to keep normal function when facing the temporary out of power.


FSS consists of smoke detectors, heat detectors (optional), H2 detectors, the fire control panel, aerosol , the dry pipe(optional), the smoke exhaust ventilation system and the UPS. FSS undertakes functions : monitor the thermal run-away risks of container through the detectors, extinguish the thermal run away, especially the flame fire, control the loss to minimum. The control panel will control and record information for the fire suppression system. The FSS is independent with any other system and it is the security guard of EnerC+ container.


TMS consists of one powerful chiller, the PTC heater and the liquid cooling pipe distributed in each battery module. The TMS will control and keep the temperature of battery within reasonable range. The battery will work at best state and reach longest life under the thermal management system.

Advantages of EnerC+ container

1) Standard design.
The 20ft design is very convenient for the transportation. The standard design can be installed one-stop.
2) New generation Cell.
EnerC+ container integrates the LFP 306Ah cells from CATL, with more capacity, slow degradation, longer service life and higher efficiency.
3) High integrated.
The cell to pack and modular design will increase significantly the energy density of the same area. The system is highly integrated, and the area energy density is over 270 kWh/m2 .
4) Extreme safety.
The system supports three levels of safety: 
Firstly, the cell safety, the highly stable lithium iron phosphate is used in the EnerC+ container. LFP is a kind of safety material especially for the BESS.
Secondly, the electrical safety: 
a) E-Stop design;
b)multiple fuse protection design;
c) insulation monitor
voltage monitor;
d) multi-channel isolation design;
e) lightning protection design.
Thirdly, the fire protection design, CATL has four-level fire control strategy. The first-level is the alarm. The second-level is ventilation and smoke exhausting to prevent deflagration. The third-level is aerosol to extinguish initial fire, and the fourth-level is the dry pipe sprinkle fire protection to prevent fire spread.
5) Adaptive thermal management.
EnerC+ integrated single-cluster water pump, temperature control strategy automatically adjusted with battery status, prolonging battery life.
6) Easy extension.
It is very convenient for the augmentation of containers or racks. Furthermore, the EnerC+ support one PCS connected to 2 containers; this will decrease the covered area significantly.
7) Independent UPS.
EnerC+ container have integrated two UPS system, one is for FSS monitoring system which available capacity is 24 hours, another one is for BMS which available capacity is 20 minutes


Power and Energy of EnerC+
DC Side Data
Product Model C02306P05L01
P-Rate 0.5P
Cell type LFP
Cell capacity 306Ah
Cell Voltage range 2.5-3.65V
Cell rated Energy 979.2Wh
Configuration 5P2P416S
Rated Energy 4073.47kWh
Rated Voltage 1331.2VDC
Voltage Range 1040 ~ 1500VDC
Rated Charging Current 1530A
Maximum Charging Current 1883A
Rated Charging Power 2036.73kW
Rated Discharging Current 1530A
Maximum Discharging Current 1883A
Rated Discharging Power 2036.73kW
Auxiliary Power & Communication
Product Model C02306P05L01 Remark
P-Rate 0.5P  
Relative Humidity 0 ~ 95 % (non-
Degree of Anti-corrosion of Battery Unit C4, (optional C5)  
Seismic Level IEEE 693-2018
Moderate design level
Auxiliary Power 1 Voltage Range 3AC+N+PE 380V~480V ±10% ,50/60HZ  
Power Max. 31.01kW For reference
Inrush Current ≤65A,< 5S  
Auxiliary Power 2 Voltage Range 1AC230(L+N) or 2AC(380-480)  
Power Max. 0.8kW (Continuous)  
Inrush Current 5A  
DC24V. 7Ah capacity.@25℃
The UPS is only used to supply power to BMS    components. The UPS   is included in the Aux    power supply
Communication Protocol CAN, Modbus/TCP  
Mechanical Data
Product Model C02306P05L01 Remark
Transportation Land or sea transportation  
Size 2896mm(H)*2438mm(D)*6058mm(W)  
Weight ~35.2t  
Color RAL7042(Optional RAL 9003)  
IP Level IP55 (Battery Room)  
IPX5 (Electrical Room)  
IPX5(Cooling unit)  
Environment condition
Specifications Range Remark
Charge Temperature Range -25℃…+55  ℃ It is necessary to inform CATL for professional evaluation if temperature beyond range
Discharge Temperature Range -25℃…+55  ℃
Storage Temperature Range -30℃…+60℃  
Application Altitude ≤2000m(no derating)  

Battery Management System(BMS)


BMS Overview

BMS is used in energy storage system, which can monitor the battery voltage, current, temperature, managing energy absorption and release, thermal management, low voltage power supply, high voltage security monitoring, fault diagnosis and management, external communication with EMS and ensure the stable operation of the energy storage system.

BMS Function

The detailed information of BMS can be seen in Table 6. The parameters including: Cell voltage sampling, Cell temperature sampling, Current sampling, HV sampling, Ambient temperature detection, Insulation detection and other important parameters.
Detailed Performance Parameters of BMS

Fire Suppression System(FSS)


FSS Overview

As an outdoor non-walk-in battery energy storage system, EnerC + provides a perfect set of fire suppression system solutions with detection, explosion control and fire extinguishing functions. The fire extinguishing control strategy is divided into four levels:
  • First level, alarm warning;
  • Second level, ventilation and smoke exhaust to prevent deflagration;
  • Third level, aerosol is released to extinguish the initial fire;
  • Fourth level, dry pipe spraying to control the spread of fire.

FSS Function

The fire suppression system is divided into three parts: detection system, explosion-proof system and fire extinguishing system. The information of the interactive interface is shown in the following: 

Thermal Management System(TMS)


TMS Overview

The TMS system of EnerC+ is liquid cooling, which main function is to maintain the temperature of the battery system to an allowable operating temperature range. Thus, the battery shall work at the best conditions, adsorb and release the maximum energy, slow degradation the SOH and maintain the longest life.
The Thermal management system is composed with the high-efficiency liquid cooling unit, the liquid cooling pipe under the bottom of battery and the PTC heater. The TMS works under the control of BMS. BMS sends
the start up or shut down signals to the cooling unit, then the cooling unit and the PTC heater will work together to change the temperature of circulating coolant liquid for heat exchange in the cooling pipe. The circulating liquid will exchange the heat with the battery through the pipe. Thus, the temperature of battery will increase or decrease into appropriate range.
For example, the cooling unit will be started if the BMS detect the battery temperature over the setting value. The cooling mode will be activated to decrease the temperature of circulating liquid until reaching the setting value. When the BMS detectsthe battery temperature less than the setting value, the heat mode will be activated to increase the temperature of circulating liquid until the setting value. Detailed information will be described below.

TMS architecture

Overview of the cooling unit of EnerC+