Electric Superbike Battery Management System 3.0
Electric Superbike Battery Management System 3.0 from Joshua Jones
Electric Superbike Battery Management System 3.0

As a part of the Rochester Institute of Technology's Electric Vehicle Team, we are dedicated to the advancement of electric vehicle technologies. RIT EVT is a team that prides itself on unique in house designs. As such, we have been developing many systems that push the capabilities and performance of many commonly used systems today. As Lead Electrical Engineer, my time has been primarily spent on the development of a battery management system that far exceeds the capabilities of most commercially available off the shelf systems. Our system is not only capable of tracking state of charge, balancing cells, and monitoring over and under charge conditions but is also equipped with an MCU that can handle up to 2048 sensors as well as perform Coulomb counting for much greater precision when determining remaining distance during a race.

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The PIC18F25K80 was selected as the primary MCU for the Battery Management System (BMS) because of its vast functionality, low power characteristics and built in Communication Area Network (CAN). This MCU controls all of the main functions of the BMS. These include state of charge, Coulomb counting, temperature and pressure as well as balancing of each of 26 cells installed in our battery modules
The BMS chip selected was designed by Linear Technologies. Their chip allows us to perform many tasks with very little sacrifice. With the LTC6802, we have the ability to passively balance an infinite stack of lithium ion cells using a single MCU as well as an S.P.I. bus.
By sequentially tying cells together in series, we have the ability to balance the cells at all times (during both charge and discharge cycles). This enabled us to integrate the BMS into the design of our battery modules. This also enabled us to discharge anywhere from 0 to 12 cells at the same time should we so choose.
The latest and most exciting addition to our Battery Management System is Coulomb Counting. With a new 16 channel 16 Bit Analog to Digital Converter, we have the ability to track the amount of energy with put into the batteries before a race. This is done using a high precision current shunt with a shunt amplifier. WIth this new system, we will be able to determine the exact remaining distance before our batteries are fully depleted. Having this knowledge helps us to optimize the bikes weight for every race.
Our entire sub-system design has been completed. We are now preparing the artwork for manufacturing. This system will be up and running very shortly.
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Electric Superbike Battery Management System 3.0

As a part of the Rochester Institute of Technology's Electric Vehicle Team, we are dedicated to the advancement of electric vehicle technologies. RIT EVT is a team that prides itself on unique in house designs. As such, we have been developing many systems that push the capabilities and performance of many commonly used systems today. As Lead Electrical Engineer, my time has been primarily spent on the development of a battery management system that far exceeds the capabilities of most commercially available off the shelf systems. Our system is not only capable of tracking state of charge, balancing cells, and monitoring over and under charge conditions but is also equipped with an MCU that can handle up to 2048 sensors as well as perform Coulomb counting for much greater precision when determining remaining distance during a race.

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Joshua Jones
Graduate Student Rochester, NY