Occam Power Solutions provides engineering consulting services in the battery management and power control space.  Some of our previous designs and projects are shown below.  Contact us for a quote.


Battery Controller Module (BCM) provides the following:

BCM
  • High-precision, high-voltage pack measurement (0.1V resolution, 0 to 400V range)
  • Pack isolation meaurement and detection
  • High precision, high current shunt measurement (0.05A resolution, -250 to +250A range)
  • Isolated contactor control (3 contactors)
  • Isolated CAN (3 channels)
  • Isolated power supply
  • Ultra low quiescent current (<0.001mA)



Battery Management Module (BMM) provides the following:

BMM
  • High precision cell level voltage measurement (1mV resolution, 0 to 4.5V/cell)
  • High precision cell temperature measurement (0.5 deg C resolution, -40 to 85C range)
  • 3 to 28 cell operation
  • Isolated communications to BCM
  • Ultra low quescent current (~0.015mA)



91S Integrated Battery Management System (iBMS) with cell test stand:

The iBMS provides the following, all in a single PCB:

iBMS
  • High-precision, high-voltage pack measurement (0.1V resolution, 0 to 400V range)
  • Pack isolation meaurement and detection
  • Isolated high precision, high current shunt measurement (0.05A resolution, -250 to +250A range)
  • Isolated contactor control (3 contactors)
  • Isolated CAN (3 channels)
  • Isolated power supply
  • High precision cell level voltage measurement (1mV resolution, 0 to 4.5V/cell)
  • High precision cell temperature measurement (0.5 deg C resolution, -40 to 85C range)
  • 3 to 91 cell operation
  • Ultra low quescent current (~0.015mA)
  • IP67 rated keyed (poka-yoke) connectors

The use of actual cells for final bench testing allows us to measure actual thermal effects, perform real balancing during cycling, and very precisely measure quiescent current over long sleep intervals.



RAV4EV - RAV4EV Test Platform:

RAV4-2
RAV4-3
RAV4-4
RAv4-5
 RAV4-GUI

Our Battery Electric Vehicle (BEV) test platform consists of a 1st generation RAV4EV converted from Nickel-Metal Hydride cells (NiMH) to Lithium-Ion Nickel Manganese Cobalt (NMC) cells.  The converted pack increases capacity from 29kWh in the original configuration to 32kWh in the lithium-ion configuration while reducing vehicle weight by over 300 lbs.


An industry standard J1772 charger solution was added in parallel to the original J1773 Small Padlle Inductive charge interface (which remains intact).


The RAV4EV provides us with a platform for long term validation of our battery management systems in a high noise, high current, high transient load environment that is simply not possible to simulate in a laboratory.  Exposing our systems to motor controller/inverter noise, large power transients, vibration and thermal cycling, and hookup to public charge stations provides our customers with truly tested solutions that don't require design iteration after design iteration in order to operate reliabily in a real world environment.






RAV GUI - A tablet based GUI was developed to provide data visualization, data logging, and communications system testing.  Real time data display included current, voltage, and temperature traces, as well as individual cell voltage measurements for the entire pack.

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