Power System Battery Management/Charging


Started: 2014-09-20
Ongoing project

The power system consists of six 5000mAh 4S1P 14.8V Lithium-Polymer (Li-Po) batteries. These batteries will go through DC-DC converters to respective voltages used around the robot to power items such as the processing unit, stepper motors, drive train, sensors, along with various other things. Currently, it is proposed to mount a few batteries directly inside the chassis of the v2 robot, pending any potential changes to it. Due to the complexity and safety issues associated with Li-Po charging and Li-Po battery technology, we decided to use commercially available iMAX B6 compact chargers. One charger for each individual battery to balance, maintain, charge, and monitor changes to ensure maximum performance. The iMAX B6 was chosen for it's simple yet reliable design along with it's 12V input source which allows for a centralized 12V power source for all the chargers. The chargers will be mounted inside the robot and a 12V power source will feed in. The 12V port will be a magnetic quick connect port to allow ease of charging. An AC/DC switching power supply is used outside the robot to convert power from the outlets to the 12V feed in source. A rack has been constructed to charge batteries on. Due to space limitations in v2 drivetrain, batteries are not charged internally. External documentation: https://docs.google.com/document/d/1oBgBlAC-KhE4CtWwHB0g7HsOgbK8nyrz3dPP31hZxNk/edit?usp=sharing