Excessive temperature rise is one of the most frequent and dangerous faults in energy storage wiring harnesses. According to statistics on energy storage engineering failures, over 90% of electrical fire hazards in energy storage power stations originate from abnormal temperature rises in wiring harnesses and terminals. Prolonged excessive temperature rises can accelerate the aging, melting, and breakdown of insulation layers, ultimately leading to short circuits, arcing, fires, thermal runaway chain reactions, and posing a direct threat to the safety of energy storage systems. The excessive temperature rise in energy storage wiring harnesses is not caused by a single factor, but mainly concentrated in four dimensions: substandard wire selection, defective terminal crimping processes, irregular construction wiring, and harsh operating environments. Comprehensive rectification and solutions are needed from the source. Firstly, the temperature rise problem caused by substandard wire selection is the most common industry malpractice. Some construction companies, in order to reduce costs, choose to use falsely labeled wire diameters, insufficient conductor cross-sectional areas, and non-standard mixed copper core wiring harnesses. Under the same current load, the current carrying capacity is insufficient, and current overload leads to continuous temperature rise. Additionally, without selecting wire diameters based on peak currents, only selecting wire diameters based on rated currents, the instantaneous peak current during energy storage system charging and discharging far exceeds the rated current, and short-term overload can quickly heat up the wiring harness. Furthermore, the temperature resistance level of the wire does not match. High-temperature energy storage cabinets use 70°C ordinary cables, which cannot withstand long-term high-temperature working environments. The wiring harness continues to accumulate heat and the temperature rise accumulates, accelerating aging and temperature rise. To solve the selection problem, it is necessary to strictly match the peak current, line length, and environmental temperature with the national standard wire diameters. Select 90°C and 105°C high-temperature-resistant energy storage dedicated wiring harnesses, eliminate non-standard falsely labeled wires, and appropriately increase the wire diameter margin for long-distance wiring and high-temperature environments to reduce line impedance and temperature rise. Secondly, terminal crimping and connection defects are the core hidden hazards of excessive temperature rise. The weak spots of temperature rise in energy storage wiring harnesses have never been the wire itself, but rather the terminal crimping points and bolt connection points. Insufficient crimping, loose wire cores, terminal oxidation, impurities on the contact surface, failure to apply conductive paste, and bolt torque not meeting standards can all lead to a sharp increase in contact resistance. During high-current operation, a large amount of Joule heat is generated, causing the terminal to heat up excessively, spark, oxidize, and turn black. The solution is to use dedicated energy storage terminals during construction, use a torque wrench to tighten according to standard torque, thoroughly clean and remove oxidation from the connection end surface, evenly apply dedicated conductive paste, reduce contact resistance, and eliminate false connections and loose connections. Thirdly, the heat accumulation and temperature rise caused by irregular wiring during construction. When wire harnesses are densely stacked, bundled too tightly, without heat dissipation gaps, closely attached to heating equipment, or enclosed in pipes without ventilation, the heat from the wire harnesses cannot be dissipated, leading to continuous heat accumulation and temperature rise. The energy storage cabin itself is a sealed high-temperature environment. If multiple high-current wire harnesses are closely fitted and arranged together during wiring, the heat will accumulate and the temperature will far exceed the normal operating temperature. During construction, it is necessary to arrange the wire harnesses in layers, reserve heat dissipation gaps, keep away from high-temperature heat sources such as battery cells and inverters, and prohibit tight bundling and enclosed wrapping to ensure air circulation and heat dissipation. Fourthly, abnormal temperature rise caused by working conditions. Dust accumulation, moisture oxidation, and aging corrosion of wire harnesses in the energy storage cabin will increase line impedance and trigger a temperature rise. Daily operation and maintenance require regular cleaning of wire harness dust, inspection of terminal oxidation, and timely maintenance. Comprehensive control from four aspects: selection, process, construction, and operation and maintenance, can thoroughly solve the problem of excessive temperature rise in energy storage wire harnesses and eliminate electrical fire hazards.