Safety Guidelines for Using Lithium Batteries in Parallel

In the process of connecting lithium batteries in parallel, it is very important to ensure the consistency of battery parameters. Key parameters include the battery’s capacity, open circuit voltage and internal resistance. Only when these parameters are similar can batteries be safely connected in parallel. In addition, in order to enhance safety, it is recommended to install a BMS in the battery pack to monitor the battery status in real time and prevent potential safety hazards.

When multiple batteries are connected in parallel, if one of the batteries has a significantly lower capacity than the others, a series of problems may occur. When charging, if there is no protection board, be sure to use a charger with a limited voltage of 4.2V to prevent overcharging of the lithium battery. Overcharging will not only increase the internal pressure of the battery, but may also cause thermal runaway and even cause an explosion.

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Even if a protective plate is installed in the battery pack, the smaller capacity battery may still be filled first, causing it to remain in an overcharged state for a long time. This situation will lead to an increase in the electrolyte inside the battery and side reactions, which will lead to battery leakage and affect its safety and performance.

Batteries with lower capacity may also be at risk of over-discharging during the discharge process. Not only will this shorten the life of the battery, it may also cause leakage, further increasing safety risks. Therefore, batteries that are overcharged and overdischarged for a long time may cause serious safety issues such as fire or explosion.

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Given that the battery you are using comes from a disassembled power bank, there may be parameter inconsistencies, and you are not sure whether the protective board is installed, it is strongly recommended not to assemble and use these batteries by yourself. Not only can this pose a threat to your own safety, but it can also be potentially harmful to the people and environment around you.

Use caution and follow safe operating procedures when handling lithium batteries. Choosing the right battery and charging equipment, and regularly checking the battery status to ensure it is working within a safe range are key to keeping you and others safe. Safety always comes first, and never ignore the potential risks of lithium batteries.