interference and needs to be isolated. Historically, the best solution for this has been to utilise the CAN communication standard along with some form of isolation. Analog Devices’ isoSPI interface is a proprietary physical layer adaptation of the standard chip-level SPI that unleashes the full potential of cost-effective distributed-pack architectures. Designed for use in high voltage and high noise systems, isoSPI provides safe and reliable data transfer of up to 1 Mbps over up to 100 meters of single twisted pair cable, using a simple pulse transformer. isoSPI offers a cost-conscious alternative to other on-board isolation solutions.
Functional Safety Management
Analog Devices’ have developed this ISO 26262 compliant platform further with the addition of the recently released ADBMS6815 multicell battery monitor which features diagnostic coverage to enable ASIL D rated systems.
The future of Battery Management Notwithstanding the existing array of industry leading BMS solutions, Analog Devices continue to innovate with their next generation of products which includes the recent announcement of the industry’s first wireless battery management system (wBMS), Figure 2.
Analog Devices have carefully developed wBMS to meet the demanding requirements of the global automotive industries next generation EV platforms, it simplifies battery pack construction whilst allowing design flexibility and reuse across different vehicles, increased battery pack energy density and optimised range, mechanical reliability and all important lower overall system cost. Analog Devices new wBMS enables automotive manufacturers the increased flexibility to scale their electric
vehicle fleets into volume production across a wide range of battery platforms and vehicle classes. The implementation of the Analog Devices wBMS allows for elimination of the need for a traditional wired harness, this can save up to 90% of the wiring typically required and up to 15% of the volume in the battery pack, saving valuable space and reducing weight as well as improving design flexibility and manufacturability, without compromising vehicle range and accuracy over the life of the battery.
The Analog Devices wBMS includes all integrated circuits, hardware and software for power, battery management, RF communication, and system functions in a single system-level product that supports ASIL-D safety and module-level security building upon Analog Devices proven industry leading BMS battery cell measurement technology. By delivering high accuracy across the entire lifetime of the vehicle battery, the wBMS enables maximum energy use per cell required to achieve the best vehicle range and supports new generation safe and sustainable zero-cobalt battery chemistries, such as lithium iron phosphate (LFP). Additional system features enable batteries to measure and report their own performance, increasing early failure detection, and enabling optimized battery pack assembly. The data can be monitored remotely throughout the battery lifecycle – from assembly to warehouse and transport through to installation, maintenance and into a second-life phase. This is the industry’s first wireless battery management system available for production electric vehicles and will debut on upcoming production EV platforms from a globally recognised automotive manufacturer. By bringing this breakthrough system innovation to market, Analog devices are helping to accelerate the entire industry towards a more sustainable future.
Figure 2: wBMS example implementation
Design Support
Anglia offers comprehensive design support via its team of fully trained FAE’s and offers evaluation hardware for the full Analog Devices portfolio including the innovative BMS product range. There is an extensive suite of demonstration boards available including three differing boards for the LTC2949 integrated current, voltage, and charge monitor, five demo boards for the LTC6820 isoSPI isolated communications interface and LTC681x multicell battery monitor. These demo boards cover all aspects of the battery management system and can be used together in different configurations allowing designers to cater for a multitude of system architectures.
Anglia offer support for customer designs with free evaluation kits, demonstration boards and samples of Analog Devices products via the EZYsample service which is available to all registered Anglia Live account customers.
Anglia’s engineering team have extensive experience of working with battery management systems and can offer component advice and system level support to designers. This expertise is available to assist customers with all aspects of their product design, providing hands on support and access to additional comprehensive Analog Devices resources including technical application notes and reference designs.
Visit
www.anglia-live.com to see the full range of other Analog Devices products available from Anglia.
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www.cieonline.co.uk Components in Electronics November 2020 9
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