Service Plug Protection Cover With Breaking Portion
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Solution Overview
Problem
Existing vehicular power source devices with protection covers for service plugs are difficult to open quickly in emergency situations, especially during car crashes, as the nuts or screws may be inaccessible, leading to a conflict between stable fixation and rapid exposure of the service plug.
Innovation Solution
A protection cover design featuring fixing boards with a breaking portion that can be easily broken using a bar, allowing the service plug to be exposed without requiring a wrench or spanner, and ensuring stable fixation during normal use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection cover is tightly fixed to the case using a nut and screw, then the service plug is reliably protected during normal use, but the protection cover cannot be quickly opened in emergency situations
Solution Approach 1:
The fixing board is segmented into a fixing portion and a linking portion with a breaking portion between them. The breaking portion is designed with lower strength than the linking portion, creating a predetermined failure point. During normal use, the nut and screw tightly secure the fixing portion to the case, ensuring reliable protection. In emergencies, force applied to the linking portion causes the breaking portion to fracture, quickly releasing the protection cover without requiring tool removal of the nut and screw.
Solution Approach 2:
The breaking portion is designed with specific material and geometric parameters that give it lower strength compared to the linking portion. This parameter differentiation creates a controlled weak point that fails at a predetermined lower force threshold, enabling quick release while maintaining strong fixation during normal operation.
2Ease of operation
If a wrench or spanner is used to remove the nut for opening the protection cover, then the cover can be removed, but it becomes inaccessible in crash emergencies
Solution Approach 1:
The invention extracts the tool-dependent removal mechanism (nut and screw requiring wrench/spanner) from the emergency opening process. Instead, the breaking portion is designed to fail under direct manual force applied to the linking portion, eliminating the need for external tools and making the opening mechanism accessible in crash emergencies where tools may be unavailable or inaccessible.
Solution Approach 2:
The protection cover system provides self-service opening capability through the breaking portion design. The structure itself contains the means for quick release (the predetermined weak point) that can be activated by direct force without requiring external tools or complex mechanisms, enabling the system to serve its own opening function in emergencies.
Data Source
AI summary
A vehicular power source device includes: a case incorporating a battery; a service plug coupled to the battery incorporated in the case; and a protection cover of the service plug. The protection cover includes: a covering portion of the service plug; a fixing board fixed to the case via a fastener; and an opening board disposed to be adjacent to the fixing board and providing a gap to the case. In addition, the fixing board includes: a fixing portion fixed onto the case via the fastener; a linking portion linking the fixing portion to the covering portion; and a breaking portion. The breaking portion is provided in the fixing portion or in a boundary portion between the fixing portion and the linking portion, and a breaking strength of the breaking portion is lower than that of the linking portion.