Reliability Analysis of the High-Voltage Power Battery System Based on the Polymorphic Fuzzy Fault Tree

Table 2

Event definitions and codes.

Event name	Event code	Event name	Event code
Functional-failure mode		Deteriorated-state mode
Battery module failure		Management system failure
Battery unit failure		Battery pack failure
No CAN communication		Inaccurate signal
No execution		Overtemperature
Short circuit		Low voltage
Monomer inconsistency		Charging fault
Fan failure		Main relay fault
Cannot be charged		High charge voltage
Electrolyte redox		Positive material phase change
Negative electrode material aging		Aging of diaphragms and increased porosity
Insulation failure		Fan not ON
Loose connection		Increased internal resistance of the battery
Plate damage		Short circuit
Low SOC		Capacity attenuation
Inconsistent voltage		Inconsistent temperature
Charger fault		Shedding of active substances
Battery deformation		Low-temperature environment
Late life		High SOC
No external internal resistance		CAN high and low reverse connection
Software bug		Impact fault
Bias fault		Electromagnetic interference
Sampling circuit fault		Connection line failure
Line damage		Damaged cooling fan
No working power supply		Low driving voltage