Three-series and four-parallel lithium battery production

The series and parallel connection of lithium batteries is a key technology to increase voltage and capacity, but it also contains safety risks. This article will analyze in detail the principles, methods and precautions of series and parallel connection of lithium batteries to help you avoid potential risks and build a battery system correctly.

The method undergoes a real-world electric vehicle testing with 276 cells. The limited charging performance of lithium-ion battery (LIB) packs has hindered the widespread adoption of electric vehicles (EVs), due to the complex arrangement of numerous cells in parallel or series within the packs.

This article will answer your questions: Lithium battery series connection is to connect multiple batteries end to end, with the positive electrode connected to the negative electrode of the next battery, which can increase the total voltage without changing the capacity.

Lithium battery parallel connection is to connect the positive poles of multiple batteries together, and the negative poles together, so that the total capacity can be increased while keeping the voltage unchanged.

The aforementioned studies covered the TR propagation scenarios for modules with different types of lithium-ion cells and different electrical connections. However, few studies have been performed on the TR propagation behaviours of modules with hybrid connection methods, i.e., modules containing both parallel and series connections.

The energy release of a single cell during TR may be limited. However, it may propagate to adjacent cells in the battery module/pack (Wang et al., 2012), which is called TR propagation of lithium-ion batteries. The TR will propagate between modules once it happens in a battery pack (Shang Gao, 2019).