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TECH & SOLUTIONS

VRFB System

What is Vanadium Redox Flow Battery?

Vanadium Redox Flow Battery (VRFB) is the most common and commercialized flow battery technology. The flow of vanadium based electrolyte in the positive and negative battery components goes through an electro-chemical process of oxidation and reduction which allows the battery to charge and discharge repeatedly with extremely minimum degradation. The main difference from other types of batteries is that the charge and the discharge occurs during the circulating flow of the electrolyte, where energy is stored directly into the electrolyte. Charging and discharging is processed through a component called the ‘stack’, where the electro-chemical reaction occurs.
  • Long Cycle Life & Shelf Life

    One of the advantages of VRFB is that it has a long storage and cycle life. VRFB generally has a life of 20,000+ cycles and over 20 life years, which is the longest amongst commercially available rechargeable battery. Due to this long life, it can dramatically reduce the total cost of ownership through low maintenance costs.

  • Power/Energy Scalability

    One of the key features of VRFB is that the power output and energy capacity are completely independent. The output is determined by the number or size of the stacks, and the energy capacity is determined by the amount of electrolytes stored in a separate tank, allowing easy scaling of power output and storage capacity according to the customer's needs. VRFB is suitable to accommodate from several kWh to hundreds of MWh large scale system.

  • Safe & Sustainable

    VRFB is inherently stable based on an aqueous electrolyte which provides a solution risk-free of explosion. It is also very sustainable due to it’s indefinite reusable and recyclable electrolytes.

Core Components

  • Stack - Single cell components

    A single-cell comprises of several components to create a positive and negative side . The electrolytes flow through each side of the electrode separated by the membrane. Several single-cells may be stacked together to create a single unit stack which decides the power capacity.

  • Vanadium electrolytes

    Energy is stored directly in the water-based vanadium electrolyte during its flow through the stack. According the battery’s charged state, the electrolyte shows four different electron states, V5+ and V4+(positive), V2+ and V3+(negative). The colors of the electrolyte in the above picture represents the actual electron state of the electrolyte. During the repeated cycling of charge and discharge, the electrolyte is non-consumed allowing an indefinite use and there is no emission of gas or byproduct

Solutions

  • Microgridt
    Micro-grid
    • As we shift to clean renewable energy source, we also shift from centralized power generation to a localized and distributed electricity supply system know as micro-grids. Micro-grids may be connected to the main grid or can be completely independent and self-sufficient grid system.
    • Micro-grid system provides a smarter and economic energy supply system in the long-term. It requires large distributed energy storage capacity to maintain a reliable power supply.
    • Long-duration energy storage system(ESS) such as vanadium redox flow battery(VRFB) ESS provides the right ESS solution for grid connected or independent micro-grids.
    • Energy independent towns, schools, military base, Islands, large scale apartments and others.
  • Renewable integration
    Renewable Integration
    • As we accelerate towards creating a more sustainable clean energy platform, intermittent energy sources such as solar and wind are gaining portion in the grid energy supply. Ultimately, we must make 100% transition to clean energy source but the intermittency of such resources causes instability and supply demand imbalance issues which limits the integration of renewable energy to the grid.
    • Energy storage plays an important role to resolve these issues and allow us to continue our efforts to transform our fossil fuel dependent energy economy. Integrating solar or wind energy also requires very large capacity energy storage. Flow battery technology is the perfect fitting solution to deal with large scale energy capacity required to stabilize and match the supply demand curve.
    • Solar & wind farms, distributed renewable micro-grid resources
  • Telecom Tower
    Telecommunication Tower
    • Telecommunication tower industry is one of the sectors that depend heavily on diesel fuel resulting high carbon emission. There are over 2 million telecom towers globally and roughly 50% of the towers are located in either an unstable grid or out of grid electricity’s reach. Especially, in developing countries, technology leap to mobile communications has increased the expansion of rural telecom towers resulting an increased dependence on diesel generators for power supply.
    • Transition to solar+energy storage not only decreases the carbon footprint but greatly enhances the economics of tower operations by lowering fuel cost. VRFB ESS, with it’s long duration storage characteristics, long life time and low operating cost provides the ideal economic solution for the industry.
    • Off-grid base stations and mobile communication towers, remote region communication facility
  • Utility
    Utility
    • Uitility scale energy storage mostly requires large scale power or energy capacity to support the front of the meter power grid needs. Today, the majority of ESS application is focused towards power oriented application such as frequency regulation but ESS application is now expanding more towards energy capacity oriented applications as renewable energy portion increases in our energy supply.
    • Long-duration type VRFB ESS is a matching solution to stabilize and time-shift energy resources from utility scale solar and wind farm. This also helps to relieve transmission & distribution grid congestion to defer additional investment in expensive power infrastructure, another key application for long-duration energy storage.
    • Long-duration VRFB storage solutions will play a key role to accelerate our transition to a carbon free energy system.
    • Power plants, substations, large-scale electricity storage facilities.
  • Residential & commercial
    Residential and Commercial Area
    • ESS applications in residential and commercial areas help to relieve peak hour loads and reduce time-of-use electricity cost by curtailing the grid electricity use during high rated hours. Behind the meter ESS installations opens new business opportunities by using aggregated ESS installation capacity to participate in the ancillary services to help manage the grid’s energy supply. Also, consumer side ESS allows the traditional electricity consumers to transform to a proactive consumer and producer, so called ‘E-Prosumer’, by exchanging excess energy.
    • Energy storage will not only change the energy industry but will also impact our daily lives by enabling us to consume and produce clean energy, smarter and more efficiently.
    • Remote residential, energy independent towns, zero-energy buildings, factories, etc.