Lithium-ion battery pack, also known as battery module, is a manufacturing process for lithium-ion batteries. It involves connecting multiple lithium-ion batteries in series and parallel configurations, while considering factors such as system mechanical strength, thermal management and BMS compatibility.
Its key technologies include overall structural design, welding and processing technology control, protection level and active thermal management system.
Series-parallel configuration: The battery module consists of individual batteries connected in series and parallel.
Parallel connection increases capacity without changing voltage; series connection increases voltage while capacity remains unchanged.
Battery requirements: Select the corresponding cells according to the design requirements.
The batteries in parallel and series connection should have consistent types and models, and the difference in capacity, internal resistance and voltage values should not exceed 2%. Whether it is a soft pack battery or a cylindrical battery, multiple series combinations are required.
PACK manufacturing process: There are two main methods for assembling battery packs.
One is through laser welding, ultrasonic welding or pulse welding, which are common welding methods known for their reliability but not easy to replace.
Another method is to make contact through a flexible metal strip, which eliminates the need for soldering and makes battery replacement easier, but may result in poor contact.
