What Causes the Bulging of Electric Vehicle Batteries?
3 Answers
The bulging of electric vehicle batteries is caused by high temperatures and overcharging. Below are detailed explanations: 1. High Temperatures: Under high temperatures, the internal pressure of the battery increases, forcing the pressure relief valve to open automatically. Once the pressure relief valve opens, it accelerates the loss of water in the battery. Excessive water loss leads to a decline in battery activity, making the battery prone to issues such as casing heating, bulging, and deformation during charging, commonly known as battery bulging. 2. Overcharging: Overcharging is the second major cause of battery bulging, so it is important to avoid overcharging. Additionally, it is crucial to use high-quality batteries. The quality of the battery is the most significant factor affecting battery bulging, with high-quality batteries experiencing fewer instances of bulging.
A swollen battery is no joke, and I find it quite alarming. It's mainly caused by internal gas expansion that pushes the outer casing outward. The most common reason is overcharging, such as when the charger malfunctions or is improperly set, leading to excessively high voltage that disrupts the chemical reactions. High temperatures also play a role—parking under direct sunlight or frequent use in summer can cause overheating, which promotes gas generation. Aging batteries nearing the end of their lifespan are also prone to swelling, as the electrolyte breaks down into gas that can't escape. The scariest part is the risk of explosion or fire. If you notice a swollen battery, stop riding immediately, turn off the engine, park in a safe location, and contact a professional repair shop for inspection. For daily use, avoid overcharging, park in shaded areas, and schedule regular maintenance to check battery health. Safety should always come first—never take chances by ignoring the issue.
Bulging indicates an internal issue with the battery, where gas expansion pushes the casing outward. The principle is quite simple—like when overcharging with high voltage or failing to recharge promptly after complete discharge, causing abnormal electrode reactions that produce excessive gas. Common causes include faulty or incompatible chargers, high ambient temperatures (e.g., leaving the car parked outside in extreme heat), or aging batteries with electrolyte leakage. If bulging is detected, stop using it immediately. Gently press the bulge (without excessive force) and disconnect all connections to prevent short circuits. Next, upgrade to a better charger or consult a professional to check for overvoltage with a voltmeter. For prevention, avoid leaving the car in extreme environments for too long, monitor charging time, and ensure proper ventilation and dryness to significantly reduce risks.
