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Gaogong Lithium Battery learned that the batteries used in Nissan Leaf have been systematically designed and prevented from potential safety risks in various levels of design, such as battery cells, modules, bMS, packs, and the entire vehicle.

Sakamoto Hideyoshi analyzed that the three most important safety precautions for power lithium-ion batteries are: how to design the battery pack; How to control the heat dissipation of the battery itself; How to design a failure management system to cope with unexpected situations. Around these three points, Nissan Automobile and Vision AESC jointly conducted targeted development.

The overall design of the battery pack includes three levels: cell, module, and pack. In the electric core link, the first thing is to ensure chemical stability, select stable materials, and detect its stability through thousands of assessments, such as overcharge, vibration, thermal shock, and even acupuncture.

Sakamoto Hideyoshi analyzed that from the perspective of battery cells, the selection of liquid electrolytes and positive and negative electrode materials for batteries is crucial. At the same time, the short circuit inside the cell is closely related to the selection of diaphragm material, therefore, Yuanyuan AESC has made special designs on the internal materials of the cell.

In the module and pack process, the structure is used to protect the battery cell from impact. This includes the overall IP67 protection design of the shell, natural air-cooled heat dissipation system, separate charging system design, and the use of heat conduction to turn the entire vehicle body into a battery heat dissipation body. At the same time, it also fully considers FMEA to ensure that safety margin is left in the design.

It is worth noting that in the pack process, in addition to physical protective measures, the key is to diagnose the fault of the battery module through bMS, monitor the occurrence of abnormalities, and predict potential problems, in order to prevent problems from occurring through power outage.

Gaogong Lithium Battery has noticed that Leaf is a pioneer in the protection strategy of the bMS process, which classifies the faults detected by bMS testing based on the meaning of Class I/II/III faults. The overall idea is to divide it into four different fault modes from three aspects: driving restrictions, charging restrictions, and fault display.

Based on the different situations monitored, the bMS on the Nissan Leaf will protect the battery system in different forms, including cutting off any charging and discharging processes from the power source, and responding to higher level faults; Considering the battery failure within a certain range, limiting the motor output power and stopping charging in charging mode (preventing energy recovery); Limit the input and output power of the battery pack.

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