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Lithium ion battery PACK assembly process and assembly method introduction

Lithium-ion battery PACK assembly process


The PACK of lithium-ion batteries is realized in two ways. One is laser welding, ultrasonic welding or pulse welding. This is a commonly used welding method. The advantage is that it has good reliability, but it is not easy to replace. The second is the contact through the elastic metal sheet. The advantage is that there is no need for welding and the battery is easy to replace. The disadvantage is that it may cause poor contact.


Lithium ion battery pack assembly method


①Serial and parallel composition: The battery is formed by connecting single cells in parallel. The capacity is added in parallel, and the voltage remains the same. After series connection, the voltage doubles and the capacity remains the same. For example, a 3.6V/10Ah battery is composed of a single N18650/2Ah through 5 parallels. Parallel first and then series: Parallel connection will affect the battery cycle life after parallel connection due to the difference in internal resistance and uneven heat dissipation. However, a single battery will automatically exit when it fails. In addition to the reduction in capacity, it will not affect the parallel connection. The parallel process is stricter. When a unit battery is short-circuited in parallel, the current in the parallel circuit will be very large, and fuse protection technology is usually used to prevent it. First in series and then in parallel: According to the capacity of the whole group of batteries, it is connected in series first, such as 1/3 of the capacity of the whole group, and finally connected in parallel, which reduces the failure probability of large-capacity battery packs.


②Battery core requirements: According to your own design requirements, select the corresponding batteries. The parallel and series batteries require the same type and model, and the difference in capacity, internal resistance, and voltage value is not more than 2%. In general, after the battery is combined in parallel and series, the capacity loss is 2%5%. The more the number of batteries, the more capacity loss. Whether it is a flexible package battery or a cylindrical battery, it must be combined in multiple strings. If the consistency is poor and the battery capacity is affected, the battery with the lowest capacity in a group determines the capacity of the entire battery group. High current discharge performance is required. The starting current of the motor is 3 times of the normal working current, and high current discharge can improve the power performance of the motor. Good heat dissipation of the battery is required. With a large number of batteries, the temperature rise of the batteries inside the battery box is not easy to dissipate, resulting in uneven temperature between the batteries, different discharge characteristics, and long-term battery performance degradation. The level of production technology is high. The battery must be able to withstand the vibration and impact of bumpy roads. High requirements for production process, especially spot welding process. Test after welding to prevent false welding and desoldering.



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