Challenges in Battery Safety Assurance
Difficulties: During the manufacturing process of lithium batteries, issues such as internal short circuits, overcharging, over-discharging, and thermal runaway can easily lead to combustion and even explosions, posing a serious threat to user safety. For example, during the battery assembly process, foreign objects like metal debris getting mixed into the battery can pierce the separator, causing the positive and negative electrodes to come into direct contact and triggering a short circuit. In the process of injecting the electrolyte, inaccurate injection volume can affect the electrochemical performance of the battery and increase the risk of thermal runaway.
Solving Process: Strengthen safety assurance measures from multiple aspects. In terms of the production environment, establish a dust-free and dry production workshop, and control the temperature, humidity, and cleanliness inside the workshop to reduce the possibility of foreign objects entering. In terms of process control, add online detection equipment, such as X-ray detection equipment, to conduct non-destructive testing on the internal structure of the battery, and promptly detect problems such as foreign objects and short circuits. In the electrolyte injection process, use high-precision metering pumps and liquid level detection systems to accurately control the injection volume of the electrolyte. In terms of battery design, optimize the structural design of the battery and adopt safety devices such as safety valves and explosion-proof valves. When the internal pressure and temperature of the battery are too high, the pressure can be automatically released to prevent the battery from exploding. In addition, develop advanced Battery Management Systems (BMS) to monitor parameters such as the battery's voltage, current, and temperature in real-time. Once abnormalities are detected, immediate protective measures, such as cutting off the charge and discharge circuit, can be taken to avoid safety accidents.
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