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LFP batteries are not inherently self balancing the way that Lead Acid batteries are. They can also be damaged by over-charge and over-discharge. Electronic control is essential.
The heart of the EV Power system is the analog cell balancer/monitor module. Simple and elegant.
A battery consists of two or more cells. There is one cell module for each cell in a battery. The cell modules perform the function of balancing and monitoring the cells.
EV Power developed its unique one wire system that connects each cell module to the next. This provides two ends that interface back to a master unit which controls charge and discharge if there is a problem with one cell.
- Epoxy Encapsulated to prevent moisture and dust interference. Also keeps out bugs, dropped spanners, loose cables, nuts and fingers!
- Gold plated cell terminal connectors for perfect connection and professional looks.
- One wire link between cell modules. We developed this system.
- Soldered signal connections for lifetime reliability.
- Low profile, does not even protrude above terminal bolts.
- Up to 2A shunt current capacity.
- No heat buildup when regulating, no bulky hot resistors.
- Small footprint the actual circuit is the size of a postage stamp! Does not interfere with mounting hardware.
- Low power consumption <3mA ==> 3+ years to drain a 100Ah idle cell.
- Reverse polarity protected.
- Internal fuse to prevent cell damage from incorrect installation.
- Simple to install and easy to understand.
- Suitable for LiFePO4 cell chemistry.
- LOW COST compared to more sophisticated systems.
- Sizes suitable for Winston Battery and CALB
A cell module can operate as a standalone shunt regulator or in combination with other modules to monitor and balance a LiFePO4 battery with any number of cells.
Connecting the signal output from a cell module in series with other cell modules and a master unit provides complete battery protection from overcharge and over-discharge.
EV Power cell modules go through a three stage burn-in testing procedure during manufacture and then a confirmation test just prior to dispatch. Four stages of testing, each and every cell module.
The above photograph shows the quiescent current draw of our V8 cell module at 3.3V. At this rate it takes 10+ years to drain a 180Ah cell. Of course it will never overdischarge the cell because it switches off at about 2.6V.