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In the research and development of lithium-ion batteries, Toyota's approach is to address safety and reliability issues with the first generation lithium-ion batteries, particularly emphasizing the safety of the battery cells themselves; The second generation lithium battery emphasizes better performance, high energy density, and high power.
Toyota's analysis of the risk factors affecting lithium-ion batteries includes overcharging, external short circuits, collisions, and internal short circuits.
Regarding overcharging, at the system level, a dual detection system is used to detect the voltage of the battery cell and module simultaneously; Regarding external short circuits, it is important at the system level to use current to turn off the system and the main circuit fuse method.
The important idea for dealing with overcharging and external short circuits at the cell level is to automatically cut off the current when a certain temperature is reached, which is achieved through the use of materials, electrodes, and structures.
Regarding collisions, the overall idea is to provide protection through the structural strength of the vehicle body and battery pack itself, while at the battery cell level, Toyota has put in a lot of research and adopted a "Heat Resistent Layer" (HRL) design. HRL is also used to address the risk of internal short circuits in battery cells, as there is currently no response method at the system level for internal short circuits in battery cells.
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