Stay Away from Charging Anxiety: BAK Battery Brings "Hardcore Safety" to Power Banks with Semi-Solid Technology

2025-09-08 | Eric

Recently, the safety of power banks has become a hot topic among consumers and within the industry, sparking concerns about everyday use. With the new power bank regulations from the Ministry of Industry and Information Technology officially taking effect on August 15, the entire industry is entering a new phase of technology upgrades centered around "ultimate safety." As a portable and frequently used device, a power bank failure can bring unpredictable risks. Demand for high-safety power banks has risen sharply, and reducing safety hazards at the cell level has become the key issue for both the industry and consumers. Against this backdrop, BAK Battery has introduced semi-solid technology into the power bank sector, creating a perfect match for the next generation of high-safety power banks and offering a practical solution for safety upgrades.

Semi-Solid Batteries: Unlocking the Safety Puzzle

Rising battery standards are driving ongoing industry transformation. Although all-solid-state batteries are widely seen as the ultimate goal for next-generation power solutions, large-scale commercialization remains far off. Semi-solid batteries, however, serve as a critical bridge between liquid and solid-state batteries. Thanks to relatively mature technology, controllable costs, and reliable performance, they have become the main development direction for power banks under stringent safety requirements.

Semi-solid batteries introduce solid electrolytes while retaining a small amount of liquid electrolyte. By significantly reducing the liquid component, they effectively prevent thermal runaway, while also delivering high energy density and excellent thermal stability—key factors in superior safety performance. To meet the industry’s urgent demand for higher safety, BAK Battery has applied semi-solid technology through innovative materials and structural optimization, strengthening the foundation of battery safety. This empowers end products to deliver enhanced safety, portability, and usability, ultimately upgrading the overall user experience.

BAK Semi-Solid Batteries: Redefining Safety and Experience in Power Banks

BAK Battery starts with the core—materials and structure—to weave safety into every detail of its power banks. Its semi-solid batteries feature a self-developed solid electrolyte membrane that offers better elasticity and puncture resistance compared to traditional separators. Even if accidentally pierced by sharp objects, the risk of short-circuiting or catching fire is greatly reduced. Safety is further enhanced by foil coating design and a uniform dispersion technology that blends solid electrolytes with electrode sheets, improving both stability and reliability. To tackle the common issue of overheating, the batteries adopt a stacked structure that lowers internal resistance by at least half compared to traditional polymer batteries. As a result, heat generation during charging and discharging is significantly reduced, ensuring long-term use without noticeable heating—giving users greater peace of mind.

Thanks to multiple protective measures, BAK’s semi-solid batteries create a strong safety barrier, passing extreme tests such as 3mm needle puncture, thermal chamber, external short circuit, and compression. This means that even in real-world accidents—drops, bumps, pressure from keys or other hard objects, or even sharp punctures—the batteries remain stable and safe at all times.

Beyond meeting high safety standards, BAK semi-solid batteries also focus on portability and practicality. A single 5000mAh cell weighs only 64.5g, about the weight of an egg, and supports stacking for higher capacity. With the integration of silicon-carbon technology, the cells achieve low expansion, allowing slimmer and lighter end products that fit easily into pockets or bags for daily commutes or outdoor trips. Designed for various climates, the batteries perform reliably in extreme conditions—from -20℃ in freezing outdoors to 55℃ inside a hot car—keeping power supply stable at all times. Moreover, power banks equipped with these batteries support 22.5W fast charging, charging devices up to 75% in just 30 minutes. This dramatically shortens charging time and eases range anxiety.

Liu Zhibo, Executive Vice President of BAK Battery, stated: “Driven by both market demand and new regulations, the power bank industry is moving into a new stage where ultimate safety is the top priority, with solid-state technology serving as the ‘core engine.’ By leveraging semi-solid technology, BAK aims to solve safety challenges at the root—the cell level—delivering next-generation battery products with both reliable performance and comprehensive safety. Looking ahead, BAK will continue to focus on technological innovation to provide consumers with a truly worry-free power bank experience.”

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