Semi-solid State Battery Energy Storage System BESS 261kwh
The battery energy storage system BESS integrates battery system with power conversion system and smart battery and energy management such as BMS and EMS. It has many connectivity options on the AC bus and the DC bus, and can connect with the power grid, the solar panel, the local electrical load, the charging station through both AC bus and the DC bus. It can be used for load balancing, el price arbitrage with connection to real time el price database, peak shaving, local el backup such as UPS service, and charging services to electrical vehicles and machineries. It can be used both on-grid and off-grid.
Technical specification
Product models | BESS261 |
Battery capacity | 261.2kwh |
Rated power | 130kw |
DoD Depth of Discharge | 100% |
Cycles | 8000 cycles ≥70%SOH@0.5C/0.5C-100%DoD 7000 cycles ≥80%SOH@0.5C/0.5C-100%DoD |
Cell type | 3.2V/314Ah, semi-solid state LFP |
C factor | Fast 1C; Standard 0.5C |
Battery cell round trip efficiency | 94.8% |
System round trip efficiency | 92-94% |
Battery setup | 1P260S |
Rated voltage | 832V |
Input voltage AC | 3~ 400VAC |
Input frequency AC | 50/60 Hz |
Input connector AC | 3P+1N+1PE |
Installation | Stationary |
IP rating | IP54 |
Operating temperature | -35°C ~ +55°C |
Cooling for battery | liquid cooling |
Cooling for PCS | liquid cooling |
PCS maximum efficiency | ≥98% |
THD | <3% |
Noise | ≤ 65dB |
Relative humidity | 5% ~ 95% |
Network connectivity | 4G, Ethernet |
Communication protocol | RS485, CAN |
Rated current AC | 180A |
Maximum current AC | 198A |
Overload capability | 1.1 times in long term; 1.2 times in 10 minutes |
MPPT for PV integration | optional, up to 120kw |
Safety and protection | Over and under voltage protection, overload protection, current leakage protection, over temperature protection, low temperature protection, grounding protection, lightning surge protection, anti-static protection, emergency stop, insulation control |
Safety features in battery | 5mm nail penetration without smoke emission, Formation of a highly stable SEI, No thermal runaway under 1?mΩ short circuit condition, |
Standby consumption | 50~150w |
Self cooling consumption | 200~600w |
Enclosure | Cabin |
Dimension | 1450x1430x2000mm |
Weight | 2600kg |
Semi solid state battery cell
A semi solid state battery has a long cylce life. It incorporates a new type of nano solid-state electrolyte technology. This significantly suppresses side reactions and reduces active lithium loss. This achieves ≥7000 cycles at room temperature with ≥80?% SOH (@0.5?C/0.5?C, 100?% DOD).
A semi solid state battery has high safety. It passes 5mm nail penetration without smoke emission. It forms a highly stable SEI with high inorganic content. It supports 1C fast discharge. There is no thermal runaway under 1?mΩ short circuit condition, and thermal runaway temperature is >120?℃.
Rated capacity | 314Ah(0.5C) |
Nominal Energy | 1004.8Wh(0.5C) |
Rated voltage | 3.2V(0.5C) |
Charge cut-off voltage | 3.65V |
Discharge cut-off voltage | 2.5V(>0℃),2.0V (≤0℃) |
Charge standard | 25℃, 0.5C CP to 3.65V |
Discharge standard | 25℃, 0.5C DP to 2.5V |
Discharge maximum power | 25℃, 1C DP to 2.5V. |
Cycles | 8000 cycles ≥70%SOH@0.5C/0.5C-100%DoD |
Operating temperature | Charge: 0℃~60℃; Discharge: -30℃~60℃ |
Storage temperature | Short-term storage(1 month）：-30℃~60℃ Long-term storage(6 months）：-20℃~40℃ |
Storage humidity | ≤85%RH |
Energy Density | ≥180Wh/kg (0.5C/0.5C) ≥385Wh/L (0.5C/0.5C) |
AC impedance | 0.18±0.05mΩ(Ac. 1kHz 25℃ , 27%SOC) |
DC impedance | 0.45±0.05mΩ(Dc. 314A 30s, 25℃ , 50%SOC) |
Weight | 5.6±0.1kg |
Shipped SOC | 27%SOC |
Self discharge | ≤3%/month(27%SOC-25±2℃ storage) |
Operating elevation | ≤5000m |
DC coupling with PV panel, battery, and charging station improves round-trip energy efficiency
A charging station needs to convert input el current to DC current so that it can be accepted by the charging objects such as an electrified vehicle or machinery. If the input current comes from battery energy storage, which outputs DC current directly, there is no need to have AC conversion in the process, and there is efficiency gain if both the battery and the charging station can be directly connected to a DC bus.
A PV panel collects photons and generates electrical current as DC current. This can be connected to a DC bus and feed directly into battery and charging station without any AC conversion in the process. This can also lead to efficiency gain.
Liquid cooling for PCS and MPPT
Liquid cooling improves cooling efficiency and lowers noise level. Battery has internal impedance and charging and discharging of the battery will have energy loss and generate heat. All the power modules that convert between AC and DC, and between DC and DC will have energy loss and generate heat. Compared to direct air cooling, liquid cooling is more effective. It can also lower the noise which typically comes from a cooling electric fan that brings in forced air for air cooling system.
