BAK Battery Introduces Semi-Solid State Technology for Safer Power Banks

Amid growing consumer anxiety over power bank safety, BAK Battery has introduced semi-solid state technology to deliver a more secure energy storage solution. Recent incidents and discussions around power bank failures have heightened public concern, especially as updated regulations from China’s Ministry of Industry and Information Technology came into effect on August 15, pushing the industry toward stricter safety standards.

Power banks, being daily carry items subject to frequent use, pose significant risks when malfunctioning. This has intensified demand for highly safe products, particularly those addressing core safety issues at the battery cell level. In response, BAK Battery has implemented semi-solid state technology tailored specifically for power banks, offering a practical and reliable route to enhanced safety.

Semi-Solid State Technology: A Solution to Power Bank Safety Challenges
While all-solid state batteries are often regarded as the ultimate goal for next-generation energy storage, their mass application remains distant. Semi-solid state batteries, serving as a transitional technology, combine mature processes, manageable costs, and well-balanced performance, making them ideal for high-safety applications like power banks.

By incorporating solid electrolytes while retaining a small amount of liquid electrolyte, semi-solid batteries significantly reduce the risk of thermal runaway. They also offer high energy density and improved thermal stability. BAK Battery has integrated several material innovations and structural optimizations to strengthen the safety foundation of its batteries, resulting in power banks that are not only safer but also more portable and practical.

BAK’s Semi-Solid State Battery: Redefining Safety and User Experience
BAK’s approach starts at the materials and structure of the battery cell. The company uses self-developed solid electrolyte membranes that are more elastic and puncture-resistant than traditional separators. This design reduces the likelihood of short circuits or overheating even when the battery is pierced. Additional safety is provided through foil coating technology and uniform mixing of solid electrolytes in the electrodes.

To address overheating during charging and discharging, BAK’s batteries adopt a laminated structure that reduces internal resistance by at least half compared to traditional polymer batteries. This significantly lowers heat generation, allowing prolonged use without noticeable temperature rise.

Thanks to these innovations, BAK’s semi-solid state batteries pass extreme tests including 3mm nail penetration, hot box exposure, external short circuit, and compression. This ensures reliable performance in daily scenarios—such as drops, impacts, or contact with sharp objects.

Despite the strong safety focus, BAK has not compromised on portability and usability. A single 5000mAh battery weighs only 64.5 grams—about the weight of an egg—and can be combined for higher capacity. The use of silicon-carbon material also helps minimize expansion, allowing for slimmer end products.

Moreover, these batteries perform reliably across a wide temperature range, from -20°C to 55°C, making them suitable for outdoor and vehicular use. They also support 22.5W fast charging, enabling devices to reach 75% charge in approximately 30 minutes, effectively reducing charging anxiety for users.

Edit by paco

Last Update:2025-09-08 11:58:01