Renesas Electronics Launches Automotive BMS Reference Design to Further Improve Vehicle Range and Battery Life
In this context, Renesas Electronics launched the ISL78714BMS5XBEKIT1Z automotive-grade multi-cell lithium-ion battery management system reference design kit based on the automotive-grade lithium-ion battery manager IC ISL78714 . This reference design can be used as a complete automotive battery management system to monitor up to 70 lithium batteries in series, while achieving ultra-high monitoring accuracy of 2mV and 6 sigma long-term drift (LTD) performance requirements, greatly extending the driving range and battery life. At the same time, the RH850 Renesas processor used in the solution can achieve ASIL-D rating.
Figure | Automotive-grade multi-cell lithium-ion battery manager reference design kit ISL78714BMS5XBEKIT1Z
Reference Hardware Board
The automotive BMS reference hardware board uses the RH850 microcontroller (MCU) to communicate with the ISL78714 multi-cell Li-ion battery management device to monitor cell voltage, battery pack temperature and current, log major fault detection and control cell balancing.
Figure | Automotive BMS system block diagram
The main ISL78714 is connected to the host microcontroller RH850 through the SPI port and additional ISL78714 devices (up to 29) are connected together through a reliable dedicated two-wire daisy chain to provide stable and isolated communication between batteries. The RH850 comes with a driver and additional application software dedicated to the BMS, and can be connected to multiple CAN, LIN, UART and RS-485 buses through interfaces and control multiple PWM outputs.
In addition, the RAA27000G power management chip can perfectly solve various power management needs, meet the RH850 MCU power timing, and reduce system design costs. The RV1S2752Q optocoupler device isolates the low-voltage control domain from the high-voltage domain of the power battery to prevent leakage from causing danger to personnel. The integrated power device or intelligent power device (IPD) can support the self-diagnosis switching function of external loads, such as fans, pumps or other load devices.
It is worth mentioning that a single ISL78714 chip can monitor up to 14 series-connected batteries, and as a complete automotive battery management system, the ISL78714BMS5XBEKIT1Z reference design kit can monitor up to 70 series-connected lithium batteries. Based on the above reference design, users can achieve the lowest BOM cost and the best FuSa/EMI/EMC/hot-swap solution, greatly reducing the R&D workload.
Application Models and Software
In electric vehicle applications, in order to use the battery safely, the battery management system needs to estimate the state of charge (SOC) and state of health (SOH). To this end, Renesas also provides the corresponding BMS application model and software for the ISL78714BMS5XBEKIT1Z reference design kit for a complete evaluation and development platform optimized for automotive battery management systems , thereby reducing customer development time and workload.
Figure | Automotive BMS application model and software
Video | Automotive BMS Application Model and Software
The automotive BMS application model and software have four major advantages:
1
Renesas Electronics provides Simulink reference application models and battery models. The model modules provided by Simulink can be loaded into the simulation processing system to estimate SOC and SOH. By confirming the simulation results on the PC and improving the estimation algorithm, modifications that occur during the actual machine evaluation phase can be reduced.
2
The reference application model can automatically generate reference application software code, thus reducing the workload of software programming;
3
Reduce software programming workload by providing reference driver software for controlling battery management ICs (BMICs) and intelligent power devices (IPDs);
4
Application notes provided by Renesas cover everything from PC simulation to code execution on the control board. These application notes will shorten the time necessary to learn the Renesas environment.
In summary, the application of BMS application models and software will achieve simulation in the design phase, thereby helping users reduce the time and workload in application development, while reducing costs and increasing market first-mover advantages.
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