During the spring and summer seasons, frequent rainfall leaves electric‑vehicle users most concerned about battery moisture, short circuits, and even damage. For owners of electric two‑wheelers, three‑wheelers, and low‑speed four‑wheel mobility scooters, the waterproof and moisture‑resistant performance of lithium batteries directly impacts both vehicle safety and service life. As a manufacturer dedicated to the R&D and production of lithium batteries, we fully understand these user challenges. To address the humid conditions of the rainy season, we have developed a comprehensive waterproofing and moisture‑proofing solution—covering everything from cell‑level protection to enclosure design. This article will provide an in-depth overview of waterproofing technologies for electric‑vehicle lithium batteries and share practical tips for everyday use.

I. What challenges do lithium batteries in electric vehicles face during the rainy season? ？

During the rainy season, lithium batteries may face the following risks:

1. Rainwater infiltrates directly.

When an electric vehicle is ridden or parked in heavy rain, water may seep into the battery pack through gaps, causing a short circuit.

2. Corrosion in humid environments

Prolonged high humidity can cause metal components to rust, and moisture on circuit boards may lead to malfunctions.

3. Condensation due to sudden temperature changes

When a battery is subjected to a sudden temperature drop in a high‑temperature, high‑humidity environment—such as being exposed to direct sunlight after rain and then splashed with cold water—condensation may form inside.

4. Accidental Immersion Risk

When water accumulates to a significant depth on low-lying road sections, the battery pack may become partially or fully submerged.

These potential hazards can, at best, lead to reduced battery life and charging malfunctions, and at worst, cause electrical leakage or even fire. Therefore, waterproof and moisture‑proof design is a critical safeguard for lithium‑battery safety.

II. Our waterproof and moisture-proof technology: four layers of protection, inside and out.

In response to the challenges of the rainy season, we Ginkgo Lithium battery Product Adopted “Core Protection” + Structural sealing + An “external barrier” multi-layer waterproofing system covers every critical component, from the battery cell to the interface.

1、 First layer of protection: BMS Conformal Coating Application—Protecting the “Battery Brain”

BMS (The battery management system) is the “intelligent brain” of lithium batteries, responsible for monitoring voltage, Electric current, Temperature and protection against overcharging and overdischarging Handling of exceptions 。 BMS circuit board If Exposure to humid environments can easily lead to oxidation and corrosion. ， Even short-circuit damage 。

Our proposal:

◆   To BMS The circuit board is fully coated with conformal coating to provide protection against moisture, salt spray, and mold.

◆   High-temperature-resistant insulating materials are used to ensure that the coating remains stable at… -40 °C ~120 Does not peel off in a ℃ environment.

Effect: Even when the internal humidity of the battery pack reaches 95%， BMS It can still operate reliably, preventing false alarms or control failures caused by moisture.

2、 Second-layer protection: All‑internal potting process ——The “Sealed Armor” of the Battery Cell

Inside conventional battery packs, cells are typically secured with brackets, and moisture tends to accumulate in the gaps.

Our proposal:

In After the battery pack has completed internal system integration, , pour silicone potting compound into the battery pack. ， The colloid completely fills the battery cell. 、 Bracket 、 BMS board The gap between them forms a seamless sealing layer with no dead zones. 。 Colloids simultaneously possess Guide Thermal function, capable of heating the battery cell 、 BMS Work heat is evenly dissipated.

Example: Taking our… 48V Take lithium battery packs as an example; after potting, they are passed through… IP67 Standard test (immersion) 1 meters deep 30 (No water enters after a few minutes), making it especially suitable for delivery e‑bikes that are frequently exposed to rain.

3、 Third-layer protection: Fully coated aluminum alloy casing ——A dual barrier against rust and scratches

The battery casing serves as the first line of defense against external moisture. Conventional steel casings are prone to rust, while plastic casings offer poor impact resistance.

Our proposal:

◆   The shell is made of 3mm Thickened Made of aluminum alloy, it is lightweight and highly durable.

◆   The surface undergoes a nano-ceramic coating treatment, forming a hydrophobic layer (water contact angle > 110 °), rainwater cannot adhere;

Effect: The coated housing retains its rust‑resistant properties even when scratched by sand and gravel, making it especially well suited for tricycles and low‑speed four‑wheelers operating on muddy roads. 。

4、 Fourth-layer protection: waterproof charge/discharge port — Plug and unplug Thousands No leaks next time.

Ordinary battery connectors are prone to short circuits when exposed to water, and wear on the metal contacts during insertion and removal can also compromise their seal.

Our proposal:

◆   The charge/discharge interface features a female socket with an embedded design; upon insertion, the plug automatically compresses the sealing O-ring.

◆   Gold-plated contacts for enhanced corrosion resistance. 5 times;

◆   Standard configuration Interface protective cover , when the battery is idle and not in use, it can be fastened on. The protective cover provides basic protection.

III. A Must-Read for Users: Battery Usage and Maintenance Guide for the Rainy Season

Even if the battery itself boasts excellent water resistance, adopting proper usage habits can further extend its lifespan:

1. Parking and Cycling Guidelines

Avoid prolonged parking in low-lying, waterlogged areas; whenever possible, choose a shaded parking spot.

When cycling through deep water (where the water level exceeds half the wheel hub), it is recommended to walk your bike across.

After rain, promptly wipe the battery casing with a dry cloth, paying special attention to the connector area.

2. Key Points for Moisture-Proof Charging

Be sure to dry both the charger plug and the battery connector before making the connection.

Avoid charging in open-air, rain-exposed conditions; we recommend using a charging station equipped with a rain cover.

After charging is complete, unplug the connector and replace the port protection cover.

3. Special Maintenance Recommendations for the Rainy Season

Inspect the battery casing seal ring for aging or deformation once a month.

If the battery is accidentally submerged, immediately disconnect power and contact customer service for inspection; do not attempt to disassemble it yourself.

When not in use for an extended period, store the battery in a dry, well-ventilated area and keep it at… 50% Battery level...

Conclusion:

The rainy season is not suitable for electric vehicles. “Natural enemy”—a professional waterproofing and moisture‑proofing solution is all it takes to meet the challenges of dampness. From… BMS From conformal coating to full potting, from coated housings to waterproof connectors, we employ four layers of protective technology to ensure… 48V、60V、72V Lithium‑ion battery packs are impervious to wind and rain. By choosing a truly waterproof battery and adopting responsible usage habits, you can ensure your electric vehicle remains safe, reliable, and delivers long‑lasting range even during the rainy season.

Safety Notice: If your battery is swollen, the connectors are oxidized, or charging behaves abnormally, stop using it immediately and contact a professional for inspection. A waterproof design is intended for prevention, not as a substitute for repairs.