Memory Package Thermal Regulation Using Phase Change Materials

The patent employs phase change materials (PCMs) that undergo phase transitions (solid-liquid or solid-solid) at specific temperature thresholds. When the memory device temperature exceeds the upper threshold, the PCM transitions from solid to liquid, absorbing excess heat. When temperature drops below the lower threshold, the PCM transitions from liquid to solid, releasing heat. This phase transition mechanism automatically maintains the memory device within its reliable operating temperature range, preventing both overheating and shutdown issues while enabling operation across extreme environmental temperatures.

The patent utilizes the thermal expansion and contraction properties of materials in response to temperature changes. The encapsulant material and PCM exhibit thermal expansion when heated and contraction when cooled, creating mechanical feedback that helps regulate the internal temperature of the memory device. This thermal expansion mechanism works in conjunction with the phase change material to prevent extreme temperature fluctuations that would compromise data integrity.

The patent integrates the phase change material directly into the memory device packaging structure, merging the thermal management function with the existing device architecture. The PCM is positioned between the memory die and the encapsulant, and the encapsulant itself serves as both a protective seal and a thermal regulation component. This merging eliminates the need for separate, complex thermal management subsystems such as external heat sinks, fans, or active cooling mechanisms, thereby simplifying the overall device structure while maintaining effective temperature control.

The phase change material provides self-regulating thermal management without requiring external control systems. The PCM automatically absorbs or releases heat based on its phase transition properties, responding directly to temperature changes within the device. This self-service mechanism eliminates the need for temperature sensors, control circuits, or power-consuming active cooling systems, significantly reducing device complexity and improving manufacturing precision compared to traditional active thermal management approaches.

The phase change material provides passive, self-regulating thermal management that requires no external power source. The PCM automatically absorbs excess heat through endothermic phase transitions when temperature rises and releases heat through exothermic phase transitions when temperature falls, creating a self-sustaining thermal regulation system. This eliminates the need for power-consuming active cooling systems such as fans, compressors, or Peltier devices, maintaining temperature stability while consuming zero additional energy.

The patent leverages the latent heat of phase transitions to achieve temperature stability without active energy input. The PCM undergoes phase changes at specific temperature thresholds, absorbing or releasing large amounts of thermal energy during transitions. This phase transition mechanism provides robust temperature control during extreme temperature conditions while maintaining zero power consumption, as the thermal regulation is driven entirely by the thermodynamic properties of the phase change material rather than external power sources.