Hofer Powertrain Builds Battery Module With Programmable Cell Pressure Control
The company says its approach could double cycle life at double energy density for some cell types.
Hofer Powertrain has developed a battery module that adjusts mechanical preload on each cell during operation, turning what is typically a fixed design parameter into one the system can actively control.
What Happened
The module uses a freely programmable force map that varies pressure on cells based on operating conditions rather than maintaining a constant preload. The company drew on more than five years of research and customer projects studying how cell preload, breathing, swelling, and deformation affect cycle life and performance across different chemistries. To measure these effects, hofer built programmable test equipment that records a cell's deformation, temperature, voltage, capacity, and impedance under defined charge and load profiles. The company says the readings flag early which mechanical constraints suit a given cell technology. This method has been applied to NMC, LFP, and next-generation solid-state cells.
Why It Matters
How much pressure a cell sees directly influences how quickly it ages. Too little or too much preload can accelerate degradation, meaning the ideal pressure varies by chemistry, format, state of charge, temperature, and operating profile. Hofer says holding pressure in the right range during operation can extend how long a cell maintains its performance. University of Cambridge research found that carefully controlled mechanical loading can significantly reduce lithium-ion aging under certain test conditions. If realized at scale, this approach could benefit applications ranging from conventional EVs to commercial vehicles, stationary storage, marine systems, and aviation—particularly for solid-state cells in grid-storage roles and batteries supporting vehicle-to-home or vehicle-to-grid operation.
The Bottom Line
Hofer estimates its programmable pressure control could yield up to double the cycle life at double the energy density when applied to current NMC and solid-state cells, though the company notes actual gains depend on cell technology, operating profile, and initial system design. No single ideal pressure works for every cell, making active control a potential advantage over fixed-preload modules.
