At Boston-Power, we gave safety equal weight at the design table when we created our lithium-ion battery technology platform. Our cell design incorporates multiple independent safety features that activate at precise trigger points, resulting in possibly the safest battery system on the market today. For large format applications, safety is further architected into blocks, modules and systems and controlled by our Battery Management System (BMS). Additionally, we have implemented stringent controls in our manufacturing processes through Six Sigma methods to augment the safe design of the batteries, including full traceability to the individual cell level.
Through a combination of inherently safe chemistry and novel safety devices integrated in the cell design for over-charge and short-circuit protection, our technology platform provides superior cell and pack-level safety when compared to alternative solutions on the market today. Each cell incorporates multiple, independent safety devices located in different areas of the cell. The design of each safety component is optimized independent of the other components, and the distributed location eliminates unwanted interactions between them.
One of the safety devices is the integrated Current Interrupt Device (CID), which electrically disconnects the cell if internal pressures get too high. The CID is located inside the aluminum can, away from the vents for greater reliability. A cell may also contain a discrete Positive Temperature Coefficient (PTC), (*Sonata only), to protect against shorts if the cell is mishandled during pack assembly. There are also two vents on the side of the can for redundancy, lessening the chance of cascading failures in a multi-cell pack. In addition, because the cell can is constructed from aluminum, supporting a low pressure design allows safety components to activate earlier, minimizing the chance that the cell will enter thermal runaway. The activation pressure and tolerances of each of the components are designed to prevent inadvertent activation.
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