KR-20260065594-A - Waterproof and dustproof housing structure for electric two-wheeled vehicle batteries

Abstract

The present invention relates to a waterproof and dustproof housing structure for protecting a battery pack mounted on an electric two-wheeled vehicle from external moisture, dust, and impact. The housing structure of the present invention includes a double-walled housing body made of aluminum alloy or flame-retardant polycarbonate material, a cover assembly having a three-stage multi-sealing structure, a heat dissipation fin assembly, a waterproof connector module, a quick-release locking mechanism, and a safety pressure release valve. The cover assembly achieves waterproof and dustproof performance of IP67 or higher by employing a three-stage sealing structure consisting of an EPDM O-ring, a silicone gasket, and a UV-curing waterproof coating layer. The heat dissipation fin assembly works in conjunction with a ventilation channel formed between the inner and outer walls of the housing and a waterproof ventilation membrane made of expanded PTFE to release heat generated by the battery to the outside via natural convection without compromising waterproof performance. Polyurethane foam shock absorber is filled within the double-wall structure of the housing body, providing impact resistance capable of passing a 1.5m drop test. The quick-release locking mechanism consists of a spring latch structure and a lever button, allowing the battery to be removed within 10 seconds with a single touch operation without the need for separate tools. The safety pressure release valve automatically opens when the internal pressure of the housing exceeds a set value to release internal gas and prevent the risk of battery explosion, and automatically re-seales by the spring restoring force after the pressure is released.

Inventors

• 이상호

Assignees

• 주식회사 핸디라이프

Dates

Publication Date

20260508

Application Date

20260416

Claims (1)

1. A waterproof and dustproof housing structure for accommodating a battery pack mounted on an electric two-wheeled vehicle comprises: a housing body (100) made of aluminum alloy (A6061-T6) or flame-retardant polycarbonate (PC/ABS alloy) material, having an internal space for accommodating a battery cell assembly and an upper opening; a cover assembly (200) coupled to close the opening of the housing body (100) and having a three-stage multi-seal structure (210) comprising a first sealing layer EPDM O-ring (211), a second sealing layer silicone gasket (212), and a third sealing layer UV-curable waterproof coating layer (213); and a heat dissipation fin assembly (300) made of aluminum alloy material that communicates with a ventilation channel (130) formed between the inner wall and the outer wall of the housing body (100) and is tightly fixed between the battery cell assembly and the inner wall of the housing via a thermally conductive interface material (TIM). A waterproof and dustproof housing structure for an electric two-wheeled vehicle battery, characterized by comprising: a waterproof connector module (400) installed on one side of the housing body (100) and allowing external electrical connection while maintaining a waterproof rating of IP67; a quick-release locking mechanism (500) including a spring latch structure (511) symmetrically arranged on both sides of the housing body (100), a locking hook (513) coupled to a catch groove (512) on the inner surface of the cover, and a lever button (514) for one-touch operation; and a safety pressure release valve (600) mounted on the cover assembly (200) and automatically opening to release pressure when the internal pressure of the housing rises above a set value (0.3 to 0.5 bar).

Description

Waterproof and dustproof housing structure for electric two-wheeled vehicle batteries The present invention relates to a waterproof and dustproof housing structure for protecting a battery pack mounted on an electric two-wheeled vehicle (including electric kick scooters, electric motorcycles, electric bicycles, etc.) from the external environment. In particular, it relates to an integrated housing structure that satisfies a waterproof and dustproof rating of IP67 or higher, effectively performs heat dissipation of the battery, and simultaneously achieves shock absorption and ease of attachment and detachment. Electric motorcycles are rapidly becoming a viable eco-friendly means of mobility in the urban last-mile transportation sector, and the safety and durability of their core power source, the lithium-ion battery pack, are directly linked to product reliability. Due to their structural characteristics, electric motorcycles are mostly driven in outdoor environments, posing a constant risk of battery damage from various external factors such as rain, car washes, road splashes, dust, and foreign matter. In particular, waterproof and dustproof design is critical for lithium-ion battery cells, as moisture penetration can lead to internal short circuits, overheating, and ultimately thermal runaway. Conventional battery housings were limited to simple plastic cases with rubber packing, and most only satisfied waterproof ratings of IP54 to IP55. Furthermore, adopting a completely sealed structure to ensure waterproofing prevented the dissipation of heat generated during battery operation, resulting in shortened battery life and performance degradation. Furthermore, as the trade-off between the ease of detachment for battery charging and replacement and waterproof performance has not been resolved, there is a growing technical need for a structure that allows users to easily detach the battery while maintaining waterproof performance. FIG. 1 is an overall perspective view of a waterproof and dustproof housing structure for an electric two-wheeled vehicle battery according to the present invention. 1. Housing body (100) The housing body (100) is a main structure that accommodates a battery cell assembly and is manufactured by casting or extrusion. The material may be an aluminum alloy (A6061-T6) or a flame-retardant PC/ABS alloy of UL94 V-0 grade. When using an aluminum alloy, corrosion resistance is improved through anodizing treatment. The housing body (100) has a double-wall structure consisting of an outer wall (110) and an inner wall, with the gap between the two walls set to 8 to 12 mm. This space is filled with a polyurethane foam shock absorber (150) with a density of 45 to 65 kg/m³ to absorb external shocks. This structure provides shock resistance capable of passing through a 1.5 m drop test (according to IEC 62133) without damage to the battery cells. Inside the housing, a rib structure for securing the battery cell assembly and a holder bracket for mounting the battery management system (BMS) board are integrally molded. 2. Cover assembly (200) having a three-stage multi-sealing structure (210) The cover assembly (200) is a structure that seals the opening of the housing body (100), and its airtightness determines the waterproof and dustproof grade of the entire housing. The first sealing layer is an O-ring (211) made of EPDM (ethylene propylene diene monomer), and an EPDM material with a cross-sectional diameter of 3.0 mm and a low coefficient of linear expansion conforming to KS B 2805 is used. The compression set is minimized by maintaining the compression ratio in the range of 15 to 25% by appropriately designing the depth of the O-ring mounting groove in the housing body. The second sealing layer is a silicone gasket (212) of Shore A 50, which is positioned in a grooved manner at a position 6 mm outside the first sealing layer. The silicone material maintains elastic properties over a wide temperature range of -40°C to +200°C, providing stable sealing performance in both hot and cold weather. The third sealing layer is formed by applying a polyurethane-based UV-curing waterproof coating agent to the entire outer periphery of the cover to a thickness of 0.2 mm and then curing it with UV irradiation (illumination of 1000 mJ/cm²). This coating layer complements the primary and secondary waterproofing functions of O-rings and gaskets, and serves to seal fine gaps such as screw fastening parts. Through the above three-stage sealing structure, the present invention can satisfy not only the IP67 (submersion in water at a depth of 1 m for 30 minutes) standard according to ISO 20653 and IEC 60529, but also the IP68 (submersion in water at a depth of 1.5 m for 30 minutes) condition. 3. Heat dissipation fin assembly (300) and waterproof ventilation membrane Heat generated during battery operation has a direct impact on battery life and performance. The optimal operating temperature for lithium-ion batteries i