What are the causes of the whole vehicle insulation failure in the BAIC EU5 R500?
3 Answers
Here are the reasons for the whole vehicle insulation failure in the BAIC EU5 R500: 1. Battery electrolyte leakage: The electrolyte is dilute sulfuric acid, which can corrode the vehicle body and other equipment. After the single-cell liquid is completely leaked, the electrode plates are directly exposed to air, causing oxidation of the plates and shortening the battery's service life. 2. External liquid ingress: After the battery system is submerged, gas is generated due to the electrolysis of water reaction. The movement of high-pressure connected gas produces switching, causing arcing at the connection points. If fully submerged, the arcing may cause a battery fire. 3. Formation of conductive circuits: After the insulation layer is damaged, conductive circuits appear between battery modules and cells, causing short circuits and resulting in whole vehicle insulation failure.
When I discovered the whole vehicle insulation fault issue with the BAIC EU5 R500, I was really panicked because it's primarily related to insulation layer damage in the high-voltage electrical system. For instance, aging battery pack casings or high-voltage wiring harnesses can allow moisture to seep through tiny gaps causing short circuits, especially after rainy days or water wading. Loose or corroded connectors can exacerbate the problem, with significant wear occurring during vehicle vibration. That time when the air conditioning suddenly lost power and the system immediately triggered a warning, I quickly pulled over and didn't dare move. Later I learned it was the protection mechanism triggered by dropping insulation detection resistance - broken spacers between battery cells inside the pack can also cause this. I recommend thoroughly drying the undercarriage after each rain exposure, and never skip professional inspections at authorized service centers to save money - safety is more important than anything.
As a professional who has handled numerous automotive repair cases, the common sources of BAIC EU5 insulation faults are insulation material wear in the high-voltage circuit or moisture intrusion. When the battery pack's sealing ring ages and cracks, moisture penetrates the conductive path, causing leakage current to exceed the standard; or the high-voltage control module's connectors oxidize and loosen, leading the system to misjudge it as a short-circuit risk. Long-term use of the vehicle in humid environments accelerates corrosion, and salt splashes are also culprits. We use a multimeter to measure whether the impedance is below the standard value for diagnosis. Owners are advised to avoid driving through deep water, regularly replace insulation gaskets, but never attempt to disassemble high-voltage components themselves, prioritizing the prevention of electric shock risks.
