CATL Holds Lead as BYD Narrows Gap in China's Battery Market

China’s electric vehicle battery sector recorded its highest monthly total this year in August, with installations reaching 79.0 GWh. This represents a 26.3% increase compared to the same period last year. Despite this overall growth, the distribution of that volume is becoming less concentrated at the very top. CATL, the long-time market leader, saw its share of the market dip slightly, while its closest rival, BYD, continued to close the distance between them.

According to data from the China Automotive Battery Innovation Alliance, CATL installed 32.54 GWh of batteries in August. This gave the company a 41.45% market share, down from 42.33% in the previous month. The decline is not due to a drop in absolute volume, as CATL’s installations actually rose by 3.6% from July. Instead, the rest of the market grew faster than CATL did, diluting its percentage. BYD, meanwhile, saw its installations jump by 15.5% to 16.47 GWh, boosting its market share to 20.98%.

BYD’s Rapid Expansion Closes the Gap

The distance between the top two manufacturers has shrunk for the third consecutive month. The gap between CATL and BYD is now 20.47 percentage points, a significant narrowing from previous months. Together, these two companies account for over 62% of the entire market. This concentration means that the health of the domestic EV supply chain is heavily dependent on just two players, with BYD gaining the most momentum.

Behind the leaders, the middle tier of the market remains relatively stable but competitive. CALB holds the third position with a 6.51% share, though this figure has also declined slightly. Eve Energy has moved into fourth place, overtaking Gotion High-tech, which now sits in fifth. The top five manufacturers collectively hold about 81% of the market, indicating that while the leaders are shifting, the broader landscape remains tight.

Lithium Iron Phosphate Dominates Over Ternary

There is a clear technological shift happening within these market shares. Lithium iron phosphate (LFP) batteries are taking an increasingly large portion of the market, reaching 67.6 GWh in August. This is a 7% increase from July. In contrast, ternary lithium batteries, which are often associated with higher performance but higher cost and complexity, continue to lose ground. Their installations fell for the third straight month, dropping to 11.0 GWh and accounting for only 14% of the total market.

This shift has significant implications for competitors. LG Energy Solution, which specializes heavily in ternary batteries, saw its share in that specific segment rise to 14.5%, reclaiming second place in that niche. However, in the overall market, its presence remains modest at 2.03%. The dominance of LFP suggests that cost-efficiency and safety are currently prioritized over the specific energy density benefits of ternary cells in the mass-market Chinese EV sector.

Market Consolidation and Future Implications

The data released by GN auto tech/ev: electric vehicle analysts highlights a market that is growing rapidly but becoming more bifurcated. The top two players are securing a larger slice of a growing pie, while smaller manufacturers struggle to maintain their foothold. The trade-off for CATL, despite its absolute volume growth, is a relative loss of market dominance. For BYD, the trade-off is the intense capital and manufacturing capacity required to sustain such rapid growth.

As the market matures, the focus will likely shift from sheer volume growth to efficiency and cost reduction. The decline of the ternary battery segment suggests that the industry is settling on a technology stack that balances performance with price. For consumers, this consolidation may lead to more stable pricing, but it also reduces the number of viable alternatives in the supply chain, creating a dependency on the top two manufacturers.