Today we will talk about why lead-acid batteries are bulging

Lead-acid batteries, whether it is a starter battery for a car or a single battery for an electric motorcycle, will swell. What are the reasons for it? First of all, it is the problem caused by the daily maintenance usage habits. For example, improper charging and discharging for a long time, excessive charging and discharging, fast high-current charging, and not paying attention to abnormal battery temperature, these habits are very harmful to the battery pack. If the electrolyte temperature of the battery pack exceeds 35 degrees, the battery plates and separator plates will swell violently at high temperatures, and even break the positive and negative plates, exceeding the expansion force that the battery casing can withstand, causing the so-called swelling phenomenon. Automobile starter batteries require high starting power, so in the manufacturing design, the lead and antimony metal content is relatively high, the plate is relatively thick, and the shell is relatively strong. Generally, the phenomenon of swelling of the battery pack used in the automobile is relatively rare. The lead-acid battery pack used in a single electric motorcycle or other purposes has a small lead and antimony metal content ratio, thin plate, poor resistance, usually high charging and discharging temperature, the plate is easy to break and bend, and the battery pack is thin, so it is easy Bloated and scrapped. If we want to avoid battery bulging or damage, then we must limit the battery temperature rise to the greatest extent, charge with low current, do not lack distilled water, do not add electrolyte, and maintain the battery pack. Correct operation is the way to extend battery life. . Starting batteries for automobiles and batteries for electric motorcycles are two different types of batteries. First of all, with different structures, car start-up batteries are maintenance-free batteries. It is a flooded battery. So there is liquid in the battery. When you shake the maintenance-free battery, you can hear the sound of the liquid inside. Batteries for electric motorcycles are lean batteries. There is no free electrolyte inside. The electrolyte is trapped in the glass fiber separator. So there is no sound when shaking. More importantly, the working principles of these two batteries are different. The car starter battery only provides a large amount of current when it is started, and waits for the engine to start the generator to start working. This is an intermittent working mode. The electric motorcycle battery works in a continuous discharge mode. As long as you drive on the road, the battery will discharge. From this point of view, the working mode of the battery used in an electric motorcycle is much more fatigued than the starting battery. The last one is the charging method of the electric vehicle battery, which takes at least 6-8 hours to be fully charged. Electric vehicle batteries usually use a constant current + constant voltage charging mode. This is also the root cause of battery failure. Constant current charging will charge the battery voltage to 14.5~14.7 volts. Under this voltage state, hydrogen and oxygen are separated out inside the battery. This is the water in the electrolyte. The hydrogen and oxygen are ionized. Partially ionized hydrogen and oxygen escape into the air. If things go on like this, it will cause the battery electrolyte to dry and lack of liquid, and the lack of liquid battery will generate heat. Thermal batteries will accelerate the evaporation of electrolyte. This is a vicious circle. The final result is an increase in the internal pressure of the battery. The plastic casing began to expand slowly, which is the root cause of the expansion of electric vehicle batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.