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Brill Power


State-of-the-art lithium-ion (Li-ion) batteries are expensive and lose their ability to hold charge as they age. This is, to a large part, due to the way that conventional batteries are connected and controlled – their performance and lifetime are limited by the weakest cell in the pack. Once the weakest cell no longer holds enough charge, most battery packs become useless and are discarded. This is the reason for high lifetime cost and large amounts of battery waste – more than 50% of cells from discarded battery packs are still useful.


We have developed battery control and management technology, which fully utilizes the available capacity of each cell in a pack. Initial results show that we are able to extend the cycle life of a multi-cell Li-ion battery by up to 60% while retaining a higher energy storage capacity than conventional battery packs. We have so far filed three patent applications and will protect our software through copyrights and embedding on microcontrollers. Current industry leaders focus on active cell balancing with low balancing currents, whereas our technology enables complete energy management, which unlocks the benefits of longer life, improved reliability, safety, and faster charging.

Uniqueness, Technology overview, barriers to competition

Our first product will be a printed circuit board (PCB) supported by specialized battery control software, which ensures optimal utilization of every cell in a pack. The product is modular and can be integrated with any size of battery pack for both stationary energy storage and electric vehicle (EV) applications. We will supply our first product to battery system integrators for stationary storage applications at an expected price of £10 per 500W of power. Our solution will allow the owners of grid-scale batteries to generate 60% more revenue from grid services thanks to the extended asset lifetime. We expect to miniaturize our technology before entering the EV market. Product margins are anticipated to be 50% for stationary storage applications and 30% for EVs. Our technology will enable OEMs to match the lifetime of the vehicle with the lifetime of the traction battery, avoiding the need for costly battery replacements.

Market size and analysis

Our first target market is grid-scale energy storage. This market is estimated to reach a size of $1B globally by 2019, growing by 33% annually. We will enter this market by developing a pilot system in partnership with a battery system integrator for small to medium sized gird-connected energy storage systems. We are currently in the process of formalizing a partnership to that end. We anticipate the completion of the pilot in 2018 and first sales in 2019. We expect to enter the EV market in 2022, which is estimated to reach a size of $250B globally with an annual growth rate of 42%. Supplying our technology to one manufacturing line of EVs, which produces 200,000 vehicles per year, will generate an expected revenue of £200M.

Core Team

First Name Last Name Job Title Impressive Facts
Christoph Birkl CEO Dphil
Carolyn Hicks CFO MBA
Damien Frost CTO

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