As lithium battery systems continue to increase in energy density, the importance of system-level safety grows accordingly. A battery module integrates multiple cells in a compact structure, which means once a single cell enters thermal runaway, the reaction may spread and cause severe damage. To address this challenge, Gushine applies a specialized safety potting material and controlled dual-stage potting process to effectively prevent heat propagation, reinforce the module structure, and enhance system reliability.
This article is prepared by the Gushine Technical Team and explains the working principle of safety potting materials, key steps in automated dispensing, and Gushine’s dual-stage potting process for safe battery packs.
The potting material plays a core role in stabilizing the battery module. It protects the pack through three functions: mechanical fixation, thermal buffering, and isolation.
Once cured, the potting material forms a dense layer between cells. If one cell experiences thermal runaway, this layer prevents high-temperature gas, molten lithium, and particles from directly affecting adjacent cells, blocking the path of thermal propagation.
The material is made from flame-retardant silicone or epoxy systems. It does not participate in combustion and helps restrict oxygen supply, suppressing flame spread within the module.
All surfaces must be clean and dry to ensure strong bonding.
A/B components are dispensed and mixed using precise metering pumps and static mixers, ensuring consistent performance from the source.
Gushine uses automated dispensing systems equipped with:
• Vacuum degassing to remove air bubbles before dispensing
• Accurate control of flow rate and pressure to avoid air entrapment during injection
After curing, each module undergoes sealing and reliability checks to ensure safety standards are met.
The module is filled with 60–80% of the potting volume while open.
This allows air to escape freely and ensures the bottom areas and narrow gaps are fully filled.
The material is left to partially cure, forming a stable gel structure that holds the filled areas in place.
The cover is installed and sealed to create a closed cavity with controlled injection and vent ports.
The remaining material is injected under controlled pressure to fully fill the upper cavity and eliminate microbubbles, ensuring a complete and bubble-free seal.
• Strong bonding with aluminum, copper, and plastics
• UL94 V-0 flame retardancy
• Low thermal conductivity to reduce heat transfer
• Long-term heat resistance and no harmful emissions
• Complies with ROHS and REACH regulations
• Precise positioning of isolation and buffer layers
• Absorbs expansion stress and vibration forces
• Protects critical electrical connections and PCB areas
Safety potting is a critical part of thermal runaway prevention in battery pack design. With 14 years of experience in custom lithium battery module manufacturing, Gushine integrates high-performance safety potting materials and a proven dual-stage dispensing process to deliver reliable and stable battery solutions for industrial, communication, medical, and energy storage systems.
We continue to innovate so that higher energy density always comes with higher safety.
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