The first is the chemical system. We are a firm iron-lithium group. It does not mean that lithium iron phosphate will not catch fire, but the probability is much lower than that of ternary batteries. This is a technical route choice.
Secondly, manufacturer quality, process control, and cell level control of the overall system are also critical, so there is a big gap between the quality levels of different manufacturers. If there is a problem with the battery, you basically cannot prevent it from other places, so the battery must first be safe.
The third is the PACK angle, which is the voltage. A large-scale fire broke out in a Korean friendly business, but a lot of household products were sold. It is rare to hear that household products caught fire. Because of the low voltage, there will be basically no problems.
The fourth is system design. This requires more consideration, such as voltage and current. This has to balance cost and safety issues. At the cell level, whether the diaphragm becomes thinner and thinner is closely related to the safety hazards of the cell itself. As the system voltage increases, the overall system cost will decrease, which is a cost advantage. But relatively speaking, the hidden dangers of safety must be better controlled.
There is another level of installation, debugging and maintenance, especially in large systems, which is more important. If the installation is not in place, the plugs are not inserted tightly, and the buried wires are not buried well.