FS-XTSmart Battery Management System

ApplicationsElectric Industrial MachineryPassenger & Commercial Electric Vehicles Battery Energy Storage Systems

Battery Monitoring Unit (Slave)

System Management Unit (Master)

FS-XT is a distributed battery management system designed for high voltage battery systems. Typically, large battery packs are built using multiple smaller battery modules connected in series or parallel combinations. That’s why the FS-XT is designed using a stackable master-slave architecture. It consists of a master unit, System Monitoring Unit (SMU) which can be connected up to 24 slave units, Battery Monitoring Unit (BMU). Each BMU can monitor from 6 to 18 cells in series. This enables FS-XT to manage battery systems from 13V to 900V. For even larger energy storage systems, multiple SMUs can be interconnected together in a parallel architecture.

The BMUs communicate with the SMU over the state of the art isoSPI protocol without the need of a processor. The SMU runs advanced SOC and SOH algorithms to provide accurate system information. It supports dual-channel current sensors, real time clock circuitry, configurable input and output ports, temperature sensing channels and can drive up to 8 external relays. It also comes with premium safety features suitable for automotive and storage applications like support for insulation monitoring devices (IMD), system interlock monitoring, contactor weld detection and system communication with isolated CAN bus. FS-XT is chemistry agnostic and compatible with all leading chemistries of lithium-ion batteries.

Introduction

Design• Stackable master-slave architecture • Each BMU manages from 6 to 18 cells in series.• Upto 24 BMUs can be connected to a single master unit,

SMU• Supports paralleling of multiple SMUs (Master Units)• Support multiple battery chemistries - LCO, LMO, NMC,

LFP, NCA and LTO

Safety• Supports contactor weld detection,Insulation Monitoring

Device(IMD) & system interlock monitoring• Watchdogs and self-diagnostics safety systems• Detection of 25 errors and 41 event flags on the battery• Status LEDs for error indication and balancing

Performance• Smart passive balancing algorithm with a configurable

balancing current • State of Charge (SOC) and State of Health (SOH) estimations

based on advanced algorithms• Sleep mode current consumption for BMU is less than 6uA

Intelligence• 200+ parameters available to configure the BMS in sync

with the battery and application• Real-time monitoring and data logging of 65+ variables• Stores up to 20 years of historical battery data• Compatible with Edison Analytics™ for insights into battery life and performance.

Communication• CAN bus 2.0 A/B interface for charger control and system

interfacing • Bluetooth 4.1 BLE monitoring capabilities with companion

mobile application ION Lens• Compatible with our Telematics Control Unit to track

battery deployments in real-time

Application Software• ION Lens: Companion Smartphone App connects to the

BMS via Bluetooth and displays live data of the battery’s performance• CAN View: Desktop software to communicate with the

BMS, get historical data and program it’s configuration parameters via the USB/CAN Adaptor

• Edison Analytics™: Cloud-connected battery analytics platform to manage a large fleet of batteries

GPIO

BMU 1Slave BMS

Voltage, Temperature monitoring

Voltage, Temperature monitoring

SMUMaster BMS

Hall effect current sensor

Coil drivers

Coil & power

IsolatedCAN 1

IsolatedCAN 2

isoSPI

isoS

PI

isoS

PI

isoSPI

BMU 12Slave BMS

isoSPI

supply

Current sensor

Precharge + -

+ -A

9 to 60V

ChargerEx: motorcontroller,

DC/DC converter

Load

CAN bus (optional)

CAN bus (optional)

Ignition Key, status LED,

Interlock, etc Dashboard

Low

Ran

ge

Hig

h R

ang

e

Relay Sensing (Voltage)VoltageSensor

Bluetooth lowEnergy Module

Micro SDcard

TemperatureSensors

TemperatureSensors

CellVoltages

12/18cells

CellVoltages

12/18cells

Bat

tery

TemperatureSensors

CellVoltages

12/18cells

TemperatureSensors

CellVoltages

12/18cells

Battery

BMU 13Slave BMS

BMU 24Slave BMS

Voltage, Temperature

monitoring

Voltage, Temperature

monitoring

+-

IMDFLT/STAT

BATT+

EARTH

BATT-

Typical FS-XT Application

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Battery Monitoring Unit (Slave) SpecificationsParameters Cell voltage rangeCell configuration (per Slave board)Balancing current per cellVoltage measurement accuracyActive mode current consumption Sleep mode current consumption Communication with SMU (Master) Temperature sensorsTemperature measurement accuracyGPIODimensionsWeight

Description1 VDC to 5 VDC6 - 18 cells in series420 mA @ 4.2V±2.80 mV14 mA @65V 6μA @65VIso-SPI1 on the board + 3 external sensors±1.00 °CFor additional temperature sensors & module controls100 X 80 X 10.63 mm~40 g

Maxwell Energy Systems Pvt. Ltd. Head o�ce 703-704 Wellington Business Park 2,Hasan Pada Rd, Marol, Mumbai-400059hello@ionenergy.co www.ionenergy.co

BMS System SpecificationsDescription

13VDC – 900 VDC

6 - 432

Two 2.0 A/B isolated CAN channels

125K, 250K, 500K, 1M kbits/sec

• 1KV DC for isoSPI,

• 2.5KV DC for CAN,

• 3KV DC for voltage sensing lines.

-40°C to 85°C

20 meters

Parameters

System voltage range

Number of cells in series for system

CAN communication

Supported CAN speeds

High system isolation level

Operating temperature

Max length supported by iso-SPI cables

System Monitoring Unit (Master) Specifications

Parameters

Input voltage

Number of slaves supported

High voltage measurement channels

High voltage measurement range

High voltage measurement accuracy

Active current consumption

Sleep current consumption

Supported output voltage range of external current sensors

Temperature sensors

General purpose output

Dimensions

Weight

Description

9 to 60 V

24

4 isolated channels

0-900V

±1VDC -40°C to 85°C

32 mA @ 60V & 25°C

14 mA @ 60V & 25°C

0-5 VDC

4 external temperature sensor (NTC) connections

• 8 channels for driving contactors for charge,discharge,

pre-charge,thermal management, etc.

• 2 high side open drain outputs,

• 2 low side open drain outputs.

155 X 155 X 17.78 mm

~150 g

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