What We Do

Technology

Element Energy’s Cell-Level BMS (CLB) utilizes adaptive cell-learning algorithms to improve the safety, energy throughput and lifetime of large lithium-ion battery packs.  We aim to make grid-tied energy storage safer and more dependable, with levelized cost of storage up to 50% lower than is possible with conventional battery management systems (BMS).

Technology

Element Energy’s Cell-Level BMS (CLB) utilizes adaptive cell-learning and management algorithms to improve the safety, energy throughput and lifetime of large lithium-ion battery packs.  We aim to make grid-tied energy storage safer and more dependable, with levelized cost of storage up to 50% lower than is possible with conventional BMS

Limitations of Conventional BMS

Conventional battery packs consist of many series-connected cells to produce sufficient voltage.  This means that all cells in the series string are charged and discharged with the same current so that the weaker cells charge and discharge more quickly than their stronger neighbors. While capacities and series resistances of new cells tend to be factory-binned and well-matched, small differences between cells grow with use. 

Conventional BMS also lacks critical safety features. While each cell in the pack is monitored, charge and discharge functions to the cells are only controllable at the pack level, with a slow response time and no means to isolate faulty cells. And since all of the cells are hard-wired together, there exist high voltages in conductors and connectors throughout the pack, providing potential to arc and feed energy to shorts.  This means that many system-level faults, including internal and external shorts, ground faults and arc faults, are relatively unprotected and are likely to cause catastrophic failure.

Element Energy’s Cell-Level BMS

Element Energy relies on the patented Cell-Level BMS (CLB) architecture developed over more than a decade of R&D to provide software control of the charge and discharge of each individual cell to improve the safety, energy throughput and lifetime of the pack.   In this way, each cell becomes an independent energy source, regardless of the states of charge, health or safety of any other cell in the pack.  Mismatch energy is recovered.  Differential aging is nearly eliminated.  Weak or failed cells are isolated for safety while the other cells continue to feed power to a load.  Internal and external shorts, series and parallel arc faults and ground faults are rapidly detected and isolated to prevent catastrophic failure.

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