What are the reasons why the BYD Qin suddenly cannot charge?
2 Answers
The reasons why the BYD Qin cannot charge include loose connections in the charging circuit, damaged charger, dry-out inside the battery, and irreversible sulfation of the battery plates. Plate sulfation refers to the excessive deposition of lead sulfate on the plates inside the battery, which increases the internal resistance and reduces the capacity of the battery. Check whether the connections in the charging circuit are secure, whether the wiring and plug contacts are intact, carefully inspect the socket and plug for signs of sparking or burning, and check for any line damage or breaks. Provide a stable DC power supply to the charger. Check whether the charger is damaged and whether the charging parameters meet the requirements, i.e., the initial charging current reaches 1.6 to 2.5A per cell; the maximum charging voltage reaches 14.8 to 14.9V per cell. Check whether there is a dry-out phenomenon inside the battery, i.e., whether the battery is severely lacking in electrolyte. Check whether there is irreversible sulfation of the battery plates. Irreversible sulfation of the plates can be determined by measuring the change in terminal voltage during charge and discharge. During charging, the battery voltage rises very quickly, and the battery does not hold or holds very little charge. If the above conditions occur, it can be determined that the battery has irreversible sulfation.
Last time I drove the BYD Qin, I also encountered this issue. It might be that the charging port is blocked by dust or dirt, causing poor contact and preventing charging. This situation is prone to happen after rain, or if the charging gun isn't plugged in tightly, leading to signal interruption. Additionally, blown internal fuses are quite common, especially in older cars with aging wiring that causes short circuits. For a simple self-check, you can try switching to another charging station or cleaning the port with a soft cloth. If that doesn't work, restarting the vehicle system sometimes helps. Don't attempt to dismantle or repair it yourself—high-voltage components are extremely dangerous. It's best to drive to a BYD 4S store immediately to check if the battery management module is faulty. Developing a habit of regularly cleaning the charging port during daily use can effectively prevent such issues. Charging problems shouldn't be delayed; address them as soon as possible to ensure driving safety.
