Maxim ROBUST BMS SOLUTION

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发表于 2016-3-7 10:35:53 | 显示全部楼层 |阅读模式
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本帖最后由 kelvin_chen 于 2016-3-7 10:38 编辑

Ensures Safe Operation of Li-Ion Battery Packs While Reducing System Cost

Our groundbreaking BMS architecture provides the most comprehensive safety and reliability available while greatly reducing
system cost. It employs a low-power, capacitively coupled daisy chain to overcome the shortcomings of current-driven
architectures.
At the heart of the system is Maxim’s fourth-generation high-voltage battery-management IC (MAX17823). This daisy-chainable
12-cell device integrates a full suite of ISO-26262 diagnostic features to ensure ASIL D compliance. To minimize isolation
requirements, our proprietary architecture utilizes a unidirectional, differential UART-to-SPI bridge (MAX17841B) to provide a
robust interface between the cell monitoring ICs and the BMS microprocessor’s SPI port. This approach only requires one pair of
low-cost transformers at the bottom of the daisy chain to achieve galvanic isolation for the high-voltage electronics. In contrast,
current-driven architectures require isolation transformers at each BMS monitoring IC, imposing a significant cost penalty.
Additionally, Maxim’s proprietary daisy chain achieves the fastest speeds for cell-stack measurements and ASIL diagnostics.
This gives you the most accurate synchronization to pack current measurements and, therefore, most accurate state-of-charge
estimation. The result is higher battery service life, higher driving range per charge, and lower system cost.

Key Advantages

Safe
• Proprietary differential UART daisy
chain has best-in-class EMC/EMI
robustness
• Integrated self-diagnostics for ASIL D
compliance
• World-class measurement and
diagnostic speed at 100 measurements
per second
Cost Effective
• Capacitively coupled daisy chain
only requires one pair of isolation
transformers at bottom of daisy chain
• Built-in diagnostics minimize part count
and development costs
Future Proof
• Superior noise immunity for future
fast-charge techniques
• High robustness for different battery
chemistries
• Supports cable lengths greater than 1m
for optimal distribution of cells
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