Reasons for Battery Heating During Charging
3 Answers
Battery heating during charging can be attributed to the following reasons: Insufficient Electrolyte: If the electrolyte level is low, the battery's internal resistance increases during charging and discharging, leading to heat generation and reduced battery lifespan. Mismatched Charger and Battery: With the widespread use of electric vehicles, many households own two or more EVs. Some users, for convenience, frequently interchange chargers. For instance, using a 60V charger for a 48V battery will cause temperature rise due to voltage mismatch. Moreover, this practice is highly dangerous and may even damage the electric vehicle directly. Therefore, it is recommended to use dedicated chargers for specific vehicles.
I've always thought that car batteries heating up during charging is quite common, usually caused by mismatched chargers or excessively high voltage settings that intensify internal chemical reactions. My old car once had a charging overheating issue, and after inspection, it turned out to be due to the battery's aging increased internal resistance combined with a too-hot charging environment, causing the temperature to rise rapidly. Overcharging can lead to electrolyte decomposition, generating heat and even causing swelling, damaging the battery. Regularly using professional instruments to check the charging status and choosing well-ventilated locations are crucial. Personal experience tells me not to use cheap chargers from small stalls—proper maintenance can prevent overheating and extend the battery's lifespan by at least three years, saving both hassle and money. Simply put, match the equipment and avoid charging in high temperatures.
From a practical perspective, the main causes of battery overheating during charging include exceeding specified charging voltage, internal short circuits, or external temperature influences. I frequently assist in checking such issues and often find that vehicle owners overlook whether the charger's output values match their battery type, leading to overheating from overcharging. Lead-acid batteries are prone to heat buildup due to electrolyte water loss, while lithium-ion batteries are more sensitive and susceptible to thermal runaway. It's advisable to consult the manual for recommended values before charging and use smart chargers that automatically adjust voltage and current, with temperature monitoring being crucial. Preventive measures include regularly cleaning electrodes and avoiding prolonged charging beyond eight hours. Immediate cooling intervention upon detecting issues can effectively mitigate risks.
