BAK Battery: Comprehensively accelerating the industrialization of solid-state batteries

"BAK Battery, based on new solid-state battery technology, can achieve the transition from polymer cells to quasi-solid-state and all-solid-state batteries, and will enable the iteration and upgrade of the company's full range of products, and can develop products for different application scenarios according to market terminal needs." On August 30, at a solid-state battery technology forum, Zhan Xiaoyun, chief engineer of solid-state battery technology of Shenzhen BAK Power Battery Co., Ltd. (hereinafter referred to as "BAK Battery"), said.

With the performance advantages of extreme safety and high energy density, solid-state batteries have become a technological high ground in the global power battery field, and a fierce race is underway. Facing the technical difficulties of solid-state batteries, as one of the leaders in the lithium battery industry and new energy industry chain, BAK has proposed a new solution based on more than 20 years of deep industry experience.

Take steady steps and innovate to solve difficult problems

BAK adopts the technology of optimizing lithium-ion transmission channels and uses independently developed high-performance electrolytes to accelerate the transmission of lithium ions, ultimately achieving high safety, high energy density, good high and low temperature adaptability, and high power characteristics of solid-state batteries.

BAK Battery's rich experience and technical advantages in electrolytes and polymer monomer materials provide strong support for its research and development of semi-solid and solid-state batteries. BAK Battery has always insisted on independently developing functional electrolytes. The electrolyte solutions used in liquid batteries with different chemical material systems can be migrated to semi-solid systems, which is an important step in the gradual transition of batteries to quasi-solid and even all-solid states.

Performance breakthrough, enabling multiple application scenarios

BAK not only focuses on technology research and development, but also demonstrates the excellent performance of its products in multiple application scenarios. BAK's 2.6Ah semi-solid product has passed the needle puncture and 3mΩ short-circuit tests. The 7Ah product under the same system did not catch fire, explode, or leak after the 3mm needle puncture test, and has been gradually used in the explosion-proof field.

While pursuing ultimate safety, BAK's 2.6Ah semi-solid-state battery also has excellent cycle performance and high and low temperature discharge performance. After 1,000 cycles at a voltage of 4.4V, the capacity remains above 85%. In an ultra-low temperature environment of -20℃, it can still maintain a discharge capacity of more than 85% at a discharge rate of 0.2C.

BAK's semi-solid-state battery products used in the two-wheel vehicle field have an energy density of up to 270Wh/Kg and have also passed the 5mm needle puncture test. Through continuous technological innovation and strict quality control, BAK has been working hard to provide safer and more reliable solid-state battery solutions and accelerate penetration into more fields.

Planning for the future, iterative upgrade of all product categories

As an industry benchmark for high-energy-density batteries, in the field of polymer soft-pack products, BAK has successfully developed a 300Wh/Kg semi-solid-state battery that supports 3C discharge, -20°C discharge and 3C fast charging, and can still maintain 90% capacity after 1,000 cycles.

BAK is also actively promoting the integrated development of "semi-solid + sodium battery". Compared with lithium batteries , solid-state sodium-ion batteries have similar energy density, lower cost and higher safety. BAK's semi-solid sodium battery also improves interface stability through technical optimization, achieving a significant increase in battery cycle performance.

Zhan Xiaoyun, chief engineer of BAK solid-state battery technology, said: "BAK Battery will launch a 390Wh/Kg semi-solid product by the end of 2024 for use in drones and automotive electronics. In 2026, BAK's target energy density for semi-solid batteries will reach 450Wh/Kg, and it is expected to transition to all-solid-state batteries in 2028. At the same time, BAK is also planning new all-solid-state products, which are expected to be launched in 2030."

BAK has always pursued the goal of achieving high safety, high energy density and long life of its products. In the field of automotive power and eVTOL, BAK has already deployed 320Wh/Kg products. At the same time, since semi-solid-state batteries are not limited to packaging forms, BAK will also enable iterative upgrades of all categories of products such as cylindrical, square, and soft-pack batteries in the future.

According to data from the China Automotive Power Battery Industry Innovation Alliance, the cumulative installed capacity of semi-solid-state batteries from January to June 2024 reached 2.15GWh, far exceeding the cumulative installed capacity of 0.80GWh in 2023. GGII predicts that the annual installed capacity of domestic (semi-) solid-state batteries in 2024 is expected to exceed 5GWh. With the outbreak of new technologies and the adjustment of industrial cycles, solid-state batteries, as the next-generation battery technology route, are leading a fierce competitive landscape. BYD Battery will go all out to seize this new window of development, and through unremitting efforts and innovation, continue to accelerate on the road to industrialization, so as to promote the high-quality development of the new energy industry and become a key force in leading future energy changes.