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 trading, 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

Full DC Architecture 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.

Full Liquid Cooling Improves Energy Efficiency and 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. Liquid cooling is more energy efficient. It can also lower the noise which typically comes from a cooling electric fan that brings in forced air for air cooling system. The noise level typically stays at around 70dB for an air cooling system. Liquid cooling can lower this down to 60 dB.

Semi Solid State Battery Cell

A semi solid state battery has a long cycle 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 (@0.5C/0.5C, 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°C.