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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