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Battery Management System (BMS) is the “intelligent manager” of modern battery packs, widely used in fields such as electric vehicles, energy storage stations, and consumer electronics.
Our system level solutions for wired and wireless BMS include not only hardware, but also a completely new wireless protocol stack that supports over-the-air software updates and achieves the highest automotive cybersecurity qualification (ISO 21434 CAL-4).
Low-voltage centralized BMSes mostly do not have any internal communications. Distributed or modular BMSes must use some low-level internal cell–controller (modular architecture) or controller–controller (distributed architecture) communication. These types of communications are difficult, especially for high-voltage systems.
Lithium iron phosphate modules, each 700 Ah, 3.25 V. Two modules are wired in parallel to create a single 3.25 V 1400 Ah battery pack with a capacity of 4.55 kWh. Volumetric energy density = 220 Wh / L (790 kJ/L) Gravimetric energy density > 90 Wh/kg (> 320 J/g).
Multiple lithium iron phosphate modules are wired in series and parallel to create a 2800 Ah 52 V battery module. Total battery capacity is 145.6 kWh. Note the large, solid tinned copper busbar connecting the modules. This busbar is rated for 700 amps DC to accommodate the high currents generated in this 48 volt DC system.
Lithium-iron phosphate batteries officially surpassed ternary batteries in 2021, accounting for 52% of installed capacity. Analysts estimate that its market share will exceed 60% in 2024. The first vehicle to use LFP batteries was the Chevrolet Spark EV in 2014. A123 Systems made the batteries.
Superior Safety: Lithium Iron Phosphate chemistry eliminates the risk of explosion or combustion due to high impact, overcharging or short circuit situation. Increased Flexibility: Modular design enables deployment of up to four batteries in series and up to ten batteries in parallel. Max. Charge Current Continuous Current Max.
