Retractable Battery Pack Handle for Space-Saving Durability
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Solution Overview
Problem
Conventional battery packs with protruding handles limit accommodation space, interfere with external objects, and have a high risk of structural damage due to concentrated force during handling.
Innovation Solution
A battery pack design featuring a handle bar with a bendable strap that embeds into an accommodation portion, secured by a stopper and magnetic forces, minimizing volume and preventing upward movement, enhancing durability and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protruding handle is provided to the external housing, then the user can move the battery pack conveniently, but the handle limits the accommodation space and is highly likely to interfere or collide with external objects
Solution Approach 1:
The handle bar is inserted into an accommodation portion formed in the external housing, creating a nested structure where the handle resides within the housing volume rather than protruding outward. This nesting approach allows the handle to be stored inside the battery pack when not in use, eliminating the need for additional protruding space while maintaining ease of handling.
2Device complexity
If a hook structure is used to restrain the handle end, then the connection is simple, but the coupling structure is easily destroyed when the user moves while picking up a heavy battery pack
Solution Approach 1:
The patent replaces the mechanical hook structure with a magnetic coupling system. A magnetic member is installed in the accommodation portion of the external housing, which magnetically attracts and holds the handle bar in place. This magnetic field-based retention mechanism eliminates the need for mechanical hooks that concentrate stress at single points, distributing the force more evenly and preventing structural damage while maintaining simple connection.
3Ease of operation
If the handle is made to protrude outward for easy access, then the user can grip it conveniently, but the handle is highly likely to interfere or collide with an external object
Solution Approach 1:
The handle design allows dynamic reconfiguration: the handle bar can be inserted into and removed from the accommodation portion as needed. When not in use, the handle is stored inside the housing, eliminating collision risk. When needed, it is easily accessed by pulling it out. This dynamic approach allows the system to adapt between two states (stored/protruding) to balance accessibility and collision prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design increases energy density by optimizing space utilization and prevents structural damage, while improving user convenience through secure handling and magnetic fixation.
Implementation Method 1
an accommodation portion configured such that when the handle bar is loaded therein, a center portion between extensions of the strap respectively extending from both ends of the handle bar is caught therein
Data Source
AI summary
A battery pack including a battery module having a plurality of secondary batteries; and a pack housing including an outer wall to form an inner space for accommodating the battery module, a handle having a handle bar to elongate in one direction and a strap in the form of a bendable strap to respectively extend from both ends of the handle bar, and an accommodation portion such that the handle bar is loaded therein, wherein the strap is embedded in the accommodation portion in a state of being bent at least once when the handle bar is loaded in the accommodation portion, and wherein a center portion between extensions of the strap respectively extending from both ends of the handle bar is caught in the accommodation portion when the handle bar is drawn out.