Key Takeaways
1. BAIC has developed a new sodium-ion battery, the Aurora, with an energy density exceeding 170 Wh/kg, comparable to current lithium iron phosphate (LFP) batteries in electric vehicles.
2. The Aurora battery can charge quickly at 4C speeds, achieving a full charge in approximately 15 minutes and maintaining over 92% capacity in cold temperatures down to -20°C.
3. The battery is designed to endure electrical, mechanical, and thermal stresses, addressing common challenges faced by EV batteries during crashes and regulatory tests.
4. BAIC has filed for 20 patents related to various aspects of the Aurora battery, indicating a strong focus on innovation and comprehensive technology development.
5. The Aurora battery is entering mass production as the demand for sodium-ion technology grows, especially amid rising lithium prices.
In a recent breakthrough in solid-state battery technology, BAIC has introduced a new battery that does not use lithium and matches the energy density of the LFP batteries that are commonly found in electric vehicles (EVs) today.
Specifications of the New Battery
BAIC’s new Aurora sodium-ion battery boasts a prismatic cell energy density exceeding 170 Wh/kg, which is on par with CATL’s Naxtra battery pack. This energy density level aligns with that of the widely used LFP batteries found in various devices, from popular Teslas to the Anker Solix 2 power station, which is currently available at a 47% discount on Amazon.
Another notable feature is its capability for quick charging at 4C speeds, allowing the Aurora sodium-ion battery to fully charge from empty in just 15 minutes. While BAIC’s team mentions an 11-minute time frame, this is likely referring to the more standard 10-90% charging test. The battery also performs remarkably well in cold conditions; it maintains over 92% of its capacity at -20°C, functioning effectively across a temperature range of -40°C (-40°F) to 60°C.
Durability and Innovation
The sodium-ion battery is resilient against electrical, mechanical, and thermal stresses, which are typical challenges for EV batteries during crashes and regulatory testing. BAIC has applied for 20 patents covering various aspects such as core materials, cell architecture, production techniques, testing methodologies, and system integration, making their Aurora battery line a comprehensive offering that includes lithium, solid-state, and sodium technologies.
In comparison, CATL has already launched a sodium-ion battery with similar characteristics. Their Naxtra series provides an energy density of 175 Wh/kg, supports peak charging at 5C, and aims for a range of 500 km on a single charge, while also offering a lifespan of over 10,000 cycles. Additionally, it functions efficiently in a broader temperature range, especially in high-temperature environments, and delivers three times the discharge power at -30°C compared to traditional LFP batteries.
Future Prospects
Moreover, the Naxtra battery has successfully obtained the forthcoming GB 38031-2025 national safety certification, marking it as the first sodium-ion cell to achieve this milestone. Nevertheless, BAIC’s Aurora Na-ion battery has made significant strides and is now preparing for mass production, which is a promising sign for the future of sodium-ion batteries, especially as lithium prices continue to rise.
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