Bigger cell sizes among major BESS cost
Trend towards larger battery cell sizes and higher energy density containers is contributing significantly to falling BESS costs.
The scale of the reduction suggests that in addition to the falling cost of batteries—BNEF's recent Lithium-ion Battery Price Survey found that battery pack prices fell 20% year-on-year to 2024, again the biggest drop recorded to date—energy storage system providers are working on cost reduction in other areas, Kikuma said.
A growing industry trend towards larger battery cell sizes and higher energy density containers is contributing significantly to falling battery energy storage system (BESS) costs.
As market demand evolves, large-capacity energy storage systems continue to advance. In 2024, 20-foot 5MWh+ systems were widely released and commercialized in H2. By 2025, 6~9MWh+ systems took center stage at ESIE 2025.
The company's energy storage battery revenue reached 57.3 billion yuan, accounting for 15.83% of total revenue, with a gross margin of 26.84%—up 8.19% YoY and surpassing its power battery business margin (23.94%), solidifying energy storage as CATL's second growth driver. 6~9MWh Energy Storage Systems: Who Will Lead the Future?
Trend towards larger battery cell sizes and higher energy density containers is contributing significantly to falling BESS costs.
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