The torque for a lithium battery terminal depends on several factors. Generally, in the case of automotive lithium batteries, the torque typically ranges from 5 to 15 N·m. However, for precise values, it is essential to refer to the specifications provided by the battery manufacturer. For large industrial or solar batteries, higher torque values are often required, usually within the range of 10 to 25 N·m.
For example, the Victron Smart Lithium 200Ah batteries specify a torque of 9 - 11 ft/lbs (approximately 12.2 - 14.9 N·m) for the terminal fasteners. In contrast, Huawei's UPS2000-G-6KRTLL 48V lithium battery module with M6 screws has a torque requirement of 4.5 - 5.5 N·m.
· Insufficient torque: The battery terminal connection may be loose, which increases the contact resistance. When current passes through, excessive heat will be generated due to the increase in contact resistance, which may cause local overheating of the battery and cause safety hazards such as thermal runaway of the battery.
· Excessive torque: It may cause the metal structure of the battery terminal to deform, destroy its original sealing performance, and cause damage to the battery terminal or connecting parts. For some sealed lithium batteries, this will make the electrolyte inside the lithium battery more likely to leak. The electrolyte is corrosive and may damage surrounding electronic components once it leaks, and it will also have a negative impact on the performance and life of the battery.
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