PUTM_EV_BMS_HV_SLAVE_2024

Accumulator Managment System (High Voltage Battery Managment System)

Overview

The AMS system consists of two main parts, the master and multiple slaves.

The apparatus is responsible for the managment of the battery as a whole, determining it's states like: state of charge or unsafe state plausibility. It also supervises the turning on and off of the hv bus.

Slave

The AMS Slave is a subsidiary system responsible for measuring all the cell voltages and strategically placed temperatures on one stack.

Hardware

The AMS Slave is powered by LTC6811, a powerful, new gen IC capable of measuring of up to 12 cell simultaneously and up to 5 auxilary readings. One slave features 2 of such IC for a total of 20 cell and 10 temperature measurements. All Slaves are connected in chain configuration allowing for a quick data dump from all slaves in series. For interfacing the LTC6811 uses isoSPI, a special SPI/Ethernet like protocol, which features amazing noise immunity due to usage of a twisted differential pair. All of that on a custom 4 layer board. The AMS slave boasts a lot smaller (106mm x 50mm) size compared to it's predecessor allowing for a lot more versatile usage and making one cell stack far more compact.

The research and development work was carried out was a part of the Student Scientific Clubs Create Innovations (SKNTI) program. Ministry of Science and Higher Education