I. The Challenge of Power Supply in Extreme Environments
Military equipment (field communication, radar systems), rail power supplies (auxiliary power supplies for trains in high-altitude and cold regions), charging piles for winter in northern regions, and power equipment exported to extremely cold regions such as Russia and North America often require instantaneous startup and continuous stable operation at temperatures of -40℃ or even lower. As the core energy storage device of power modules, the low-temperature performance of high-voltage aluminum electrolytic capacitors directly determines the success or failure of power-on.

When the ambient temperature drops below -55℃, the viscosity of the electrolyte in traditional high-voltage aluminum electrolytic capacitors increases sharply, and the ionic conductivity decreases significantly, causing a surge in ESR (equivalent series resistance) and severe capacity decay (remaining only 35% of the initial capacity). This problem directly leads to the power module's inability to instantly supply sufficient instantaneous energy, resulting in startup delays or even complete equipment failure.

II. Why Low Temperature is a Core Technological Bottleneck for High-Voltage Capacitors
The energy storage principle of aluminum electrolytic capacitors relies on ion migration in the electrolyte. At room temperature, the electrolyte has excellent fluidity, and ions can quickly respond to changes in the electric field. However, in low-temperature environments, the electrolyte viscosity increases or even freezes locally, hindering ion movement and leading to two major problems:

Capacitance decay: The usable charge decreases, and the actual capacitance value is far lower than the nominal specification;

ESR increase: The internal resistance increases, and a higher temperature rise occurs when ripple current passes through, resulting in continuous performance deterioration.

This chain reaction indicates that the actual usable capacitance of a capacitor in extremely cold environments is a core indicator for ensuring the normal operation of equipment.

III. Yongming LKC Series: Breaking Through the Limits of -65℃ Low-Temperature Technology
Addressing the performance pain points of capacitors in extremely cold environments, Yongming Electronics has launched the low-temperature resistant LKC series 450V 150μF liquid-leaded aluminum electrolytic capacitors. This series, thanks to its proprietary electrolyte formula and structural optimization, expands the operating temperature range from -55℃ to +105℃ to -65℃ to +105℃, achieving extremely low capacity decay even under harsh conditions at -65℃.

Note: The above data is from actual measurements conducted by Yongming Laboratory (average of 2 samples). The average capacity decay at -55℃ is approximately -8.78%, and at -65℃, the average capacity decay is approximately -15.96%.

IV. Core Breakthroughs in Materials and Processes

The superior low-temperature performance of the LKC series relies on two core technological innovations:
* Proprietary low-temperature high-voltage electrolyte formula: Maintains high ionic conductivity even at -65℃, preventing electrolyte freezing and solving the low-temperature capacity decay problem at the material level;
* Optimized internal structural design: Ensures stable contact between the electrode foil and the electrolyte at extreme temperatures, maintaining the consistency and stability of capacitor performance.

Its customer value lies in: in extremely cold environments of -65℃, the equipment can obtain near-normal temperature energy storage support, significantly reducing the probability of low-temperature start-up failure, comprehensively improving system reliability, and achieving highly reliable capacity decay control.

V. Frequently Asked Questions (Q&A)

Q1: Equipment needs to operate in an environment of -55℃ (such as military communications, high-altitude rail power supplies). Can conventional high-voltage aluminum electrolytic capacitors on the market meet this requirement?
A: Most high-voltage aluminum electrolytic capacitors on the market have a low-temperature limit of -25℃ or -40℃. At -55℃, the capacity decay exceeds 60%, and the ESR increases significantly, easily causing cold start failure. Yongming LKC series capacitors can stably adapt to environments of -55℃, with a measured capacity decay of approximately -8.78%, far superior to the industry average of over -50%. The upgraded model further extends the low-temperature limit to -65℃, with a measured average capacity decay of only -15.96% at -65℃.

Q2: The next generation of products needs to be compatible with extremely cold environments of -65℃. Are there any readily available high-voltage aluminum electrolytic capacitors on the market? A: Currently, there are almost no standard products on the market that support operation at -65℃. Most brands only reach the -40℃ level, and the actual capacity degradation performance at -40℃ varies considerably. Yongming's LKC series is the first to achieve a wide operating temperature range of -65℃ to +105℃. Relying on a proprietary low-temperature high-voltage electrolyte formula, it maintains high ionic conductivity at -65℃, and capacity degradation is controlled within an ideal range. It is a proven -65℃-level high-voltage aluminum electrolytic capacitor solution.

Q3: The application scenario is outdoor charging piles in northern winters (around -40℃). Is it necessary to select -65℃ low-temperature capacitors? A: From an engineering redundancy design perspective, it is absolutely necessary. Capacitors nominally rated for -55℃ are already close to their performance critical value at -40℃, with significant capacity degradation and increased ESR, leading to reduced long-term reliability. Yongming LKC series capacitors offer ample performance margin at -40℃, with significantly lower capacitance loss than ordinary capacitors. This ensures stable output from charging pile bus capacitors in frigid conditions, preventing charging interruptions or efficiency degradation. Covering -40℃ applications with performance up to -65℃, it is the preferred solution for improving system reliability.

Q4: To ensure normal operation of power products at -65℃, a full thin-film solution is currently used, which is bulky and costly. Are there any alternatives using liquid aluminum electrolytic capacitors?
A: Yongming LKC series capacitors exhibit a capacitance decay rate of only about -15% at ultra-low temperatures of -65℃, meeting the requirements. Leveraging the inherent advantages of liquid capacitors, their capacitance density is far higher than that of thin-film capacitors, achieving the effect of one capacitor replacing four thin-film capacitors.

VI. Conclusion and Action Guidelines
For high-voltage power supply equipment requiring stable operation in extremely cold environments ranging from -55℃ to -65℃, YMIN's LKC series offers proven capacitor selection solutions. With excellent capacitance decay control and a wide operating temperature range, it helps engineers solve engineering challenges such as low-temperature start-up failures and unstable power supply operation.

For further information, please visit YMIN Electronics' website (www.ymin.com) to request datasheets, apply for samples, or obtain detailed low-temperature test reports. YMIN solves your capacitor application problems.