For extra reliability, a ring cable can be installed, which can transmit data in either direction in the event of a daisy chain cable break. Current sensing on the power line is also used to calculate the battery pack’s state of charge and state of health. In a wired system, the monitors are connected in a daisy chain of twisted-pair cabling, which carries cell temperature and voltage data back to the BMU. Power electronics market 2020: Winners, losers and opportunities We can look a little more closely at both approaches to better understand their relative merits. There are several design considerations which must be traded off to decide on the best option for any particular project. However, designers must decide on which type of communication channel to use: the monitors can be connected back to the BMU either with wires, or wirelessly. This way, the BMS can ensure that all cells are operating correctly, while load sharing is properly balanced. Accordingly, the BMS can operate in real time to monitor the performance of each cell within the EV. The battery monitors, which are mounted one on each cell, must connect with a central Battery Management Unit (BMU) to make up a distributed Battery Management System (BMS). The EV battery communications requirement One common design technique is to implement a distributed battery pack system, which supports high-cell-count packs by using multiple high-accuracy battery monitors. These high-voltage packs are increasingly requiring more sophisticated technologies to report cell diagnostics for each cell in a safe, timely and reliable manner.
Automotive wireless battery monitor series#
The EV’s AC motor may demand up to 800 V or more this translates into potentially 100 or more Li-ion cells stacked together in series inside the vehicle chassis.
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