From Lithium Batteries to Hydrogen Energy: How to Solve the Endurance Problem of Drones？

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As we all know, drones are becoming increasingly versatile nowadays. They can be seen everywhere, handling tasks such as delivery, inspection, mapping, agricultural plant protection and emergency rescue. However, many people share the same impression: while drones powered by lithium batteries are highly convenient, they always seem to have a short flight time.

So how can we solve this problem? Many people would naturally come up with an idea — simply install more lithium batteries to extend their flight time. This sounds reasonable, yet things are not as straightforward as they seem in practice. Today, we will elaborate on this topic based on a relevant research study.

1. Can drones achieve longer flight time simply by installing larger batteries?

The answer is definitely no. Unlike ground vehicles, drones are designed to fly. And any aircraft is faced with a fundamental limitation: there is a maximum weight it can carry aloft.

This limited weight has to be distributed among various components: the airframe, motors and propellers, control systems, mission payloads and power systems. This is where the core problem lies. To extend a drone's flight time, more power sources need to be carried. However, extra power sources add to the overall weight of the aircraft, which in turn raises power consumption.

This creates a tricky dilemma. While carrying more energy is meant to prolong flight duration, the added weight ends up reducing it instead. Simply installing a larger battery cannot resolve this issue.

In essence, operating a drone is like solving a resource allocation problem with a fixed total weight. The airframe, payload, power and propulsion systems all have to share this weight limit. An aircraft's performance fundamentally depends on weight distribution, energy configuration and overall system efficiency.

Increasing payload capacity means cutting down space for power supplies. To achieve longer flight time, engineers have to fit more usable energy within the restricted weight budget. To accomplish both goals simultaneously, a more sophisticated and efficient overall design is a must.

In short, these components are not independent of one another but mutually restrictive. The propulsion system of a drone is essentially a system built for trade-offs. There are always inherent conflicts between flight endurance, payload capacity, weight and operational efficiency.

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2. What exactly are the advantages of hydrogen-powered drones?

Judging from the performance of current commercial drones, lithium batteries work quite well and can meet the demands of most scenarios. So why do we still conduct research on hydrogen power? To start with the conclusion: lithium batteries are by no means inferior. They are mature, user-friendly and have relatively predictable costs, remaining the most common power source for commercial drones today.

Nevertheless, they have an unavoidable drawback. When mission durations extend, lithium batteries are prone to hitting a flight endurance limit. To boost endurance with lithium batteries, drones generally need to carry more battery cells, which inevitably adds extra weight. The increased weight in turn reduces flight efficiency, making it increasingly difficult to further improve flight time.

This is where hydrogen fuel cells demonstrate their strengths. Their biggest advantage is not environmental friendliness, but the ability to deliver more energy per unit weight, thanks to hydrogen's superior energy density.

Hydrogen-powered drones can achieve a remarkable increase in flight endurance without adding excessive overall weight. Under current commercial technological conditions, hydrogen fuel cell solutions generally deliver far longer flight time than lithium battery alternatives. Hydrogen power performs exceptionally well especially for missions requiring prolonged flight and fewer mid-air refueling stops.

For multi-rotor drones, hydrogen power enables flight endurance of several hours, roughly two to three times that of lithium battery drones of the same weight. For platforms more suited for long-distance missions, such as compound-wing drones and vertical takeoff and landing fixed-wing drones, the long-endurance edge of hydrogen power becomes even more prominent.

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What deserves more attention is that hydrogen-powered drones still have considerable room for performance improvement in the future. Why is that? Because they can be further optimized in several aspects: lighter airframes, more efficient hydrogen storage methods, and lighter and more powerful fuel cells.

Hydrogen storage technology stands out as an especially crucial factor. When it comes to carrying hydrogen for flight, liquid hydrogen storage boasts a significantly higher energy density than the current gaseous hydrogen storage. This means the competitiveness of hydrogen-powered drones lies not only in their already proven long endurance but also in their potential for further enhancement in the days ahead.

3. Should all drones be switched to hydrogen power in the future?

It depends. Different application scenarios impose varying requirements on drones. As application scenarios keep expanding, flight endurance and payload capacity have increasingly become key factors that determine the operating range, working duration and in-depth application of commercial drones.

For instance, logistics transportation prioritizes long flight distances and strong load-carrying capacity; agricultural operations focus more on continuous working efficiency; inspection and monitoring attach great importance to flight endurance and stability; environmental perception emphasizes task adaptability, while emergency rescue lays stress on rapid takeoff and sustained task execution.

When choosing a power system, we cannot simply ask "which is more advanced, lithium batteries or hydrogen energy". Instead, we need to take task requirements into account.
For short-duration tasks that prioritize reliability, convenience and low operating costs, lithium batteries are usually the better option. If a task demands longer range, fewer refueling stops and extended continuous operation time, hydrogen power is well worth considering.
In short, lithium batteries suit short-term tasks while hydrogen energy fits long-term ones. What truly matters is not which technology is absolutely superior, but which solution is more applicable to specific scenarios.

As the low-altitude economy continues to develop, drones are no longer merely required to "get airborne". Instead, they need to "fly steadily, stay aloft longer and operate continuously". Against this backdrop, the selection of power systems is no longer just a technical detail, but a critical issue that shapes application scope and industrial development.

In the future, the development of drone power systems will most likely not follow a single dominant path. Instead, lithium batteries, hydrogen energy and a host of other new solutions will each leverage their strengths for diverse application scenarios. This is perhaps the most noteworthy aspect as technologies move toward practical real-world deployment.