CATL plans 40 GWh sodium plant

Sodium-ion batteries have spent years sounding like the backup plan — cheaper materials, better cold-weather behavior, decent safety, but never quite enough scale to matter. That is what changed this month. CATL, already the world’s biggest battery maker, is now planning a dedicated 40 GWh sodium-ion expansion in Fujian after signing a 60 GWh sodium supply agreement with energy-storage integrator HyperStrong. That is not a lab story anymore. It is a factory story. ### Why is this a bigger deal than another factory filing? Because the numbers finally line up. CATL’s new project would add 40 GWh of annual sodium-ion capacity, and it follows a three-year 60 GWh order that CATL and HyperStrong call the largest sodium-ion supply agreement disclosed so far. A chemistry starts to look real when orders and factories begin chasing each other in both directions — demand pulling supply, and supply making customers less nervous about betting on it. (cnevpost.com) ### What exactly is CATL building? The filing points to a new sodium-ion power-battery production line at CATL’s Fuding base in Ningde, Fujian, through its wholly owned subsidiary Fuding Shidai. CATL plans to spend about 5 billion yuan, build new cell, electrode, testing, and module facilities, and finish the project over roughly 24 months. When this sixth-phase expansion is counted in, the total planned capacity at the Fuding base reaches 149 GWh. (cnevpost.com) ### Why sodium, not just more lithium iron phosphate? Basically, sodium is attractive where cost, safety, temperature range, and durability matter more than squeezing out the very highest energy density. CATL says its sodium cells handle wide temperature swings, generate less heat, and can simplify system design in long-duration storage. That makes them especially interesting for grid storage, remote renewable projects, and other jobs where batteries sit still and cycle for years. (cnevpost.com) ### Is this mostly about cars or the grid? Right now, mostly the grid. The HyperStrong agreement is specifically for energy storage, and CATL’s recent sodium push has leaned hard into stationary storage products. At ESIE 2026, CATL presented a sodium-ion storage battery aimed at 2-hour to 8-hour utility projects, shared storage, renewable bases, and AI data centers. The cell keeps the same enclosure dimensions as CATL’s existing 587 Ah lithium storage cell, which lowers switching friction for customers and for CATL’s own manufacturing system. (catl.com) ### Why does compatibility matter so much? Because a new chemistry usually dies in the boring parts — pack design, factory tooling, certification work, and project integration. CATL is trying to dodge that trap by giving its sodium storage battery the same form factor as its lithium product. Think of it like changing the engine without redesigning the whole car around it. If developers can slot sodium into familiar hardware and supply chains, adoption gets much easier. (hyperstrong.com) ### What is the catch? Sodium still does not win every job. Its biggest weakness versus top lithium chemistries is energy density, which matters a lot in passenger EVs where space and weight are brutal constraints. That is why CATL keeps framing sodium and lithium as a “dual-star” path rather than a total replacement story. The company is building optionality — use lithium where density matters most, use sodium where economics and resilience matter more. (catl.com) ### Why now? Turns out CATL has been laying the groundwork for a while. It launched the Naxtra sodium-ion brand in 2025, said sodium would enter large-scale deployment in 2026, and had already put close to 10 billion yuan into sodium R&D by the end of 2025. The order from HyperStrong looks like the market signal CATL needed to move from commercialization talk to capacity buildout. (ess-news.com) ### Bottom line The important shift is not that sodium-ion batteries suddenly beat lithium everywhere. They do not. It is that CATL is now treating sodium as a scaled manufacturing business with named customers, multi-year volumes, and a real factory footprint. Once that happens, the competition changes — from “does this chemistry work?” to “who can deliver the right chemistry, at scale, for the right job?” (cnevpost.com)