Large-cell lithium batteries (usually cells with a single cell capacity of ≥200Ah) are an important technical direction in the current energy storage and power battery fields. Their core advantages are reflected in system integration efficiency, cost control, life and simplified management.

1. Core advantages
(1) Improve system energy density

Optimize volume utilization:
Large cells reduce the number of modules and structural parts (such as end plates and connecting cables), which increases the volume energy density of the battery pack by 10%-20%.

(2) Reduce overall costs

Material and manufacturing costs:

The amount of structural parts such as shells and poles per unit capacity is reduced (such as 100 50Ah cells vs 20 250Ah cells);

Simplify the production process (reduce welding points and improve yield).

Data: The cost of the energy storage system of large cells can be reduced by 15%-25% (according to CATL's 2023 annual report).

Operation and maintenance costs:
Fewer cells reduce the complexity of the BMS (battery management system) and reduce the failure rate.

(3) Extended cycle life

Reduced consistency requirements:
The number of large cells in parallel at the same capacity is reduced, and the impact of single cell differences on the system is weakened (such as 20 strings vs. 100 strings), and the cycle life is increased by 10%-15%.

(4) Simplified thermal management

Thermal runaway risk control:
The number of large cells is reduced, the heat spread path is easier to design (such as interval heat dissipation channels), and the energy consumption of the cooling system is reduced.