Secondary Battery Degassing Hinge Structure for Obstacle-Free Venting
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Solution Overview
Problem
Existing degassing devices in secondary batteries are often obstructed by structural components, leading to insufficient gas discharge, potential wire damage, and short circuits, limiting their effectiveness in safely releasing internal pressure.
Innovation Solution
A degassing device with a central portion exposed to the outside, a bonding portion, a peripheral portion with a sloped surface, a main hinge, and sub-hinges that facilitate controlled opening to allow gas discharge, featuring trapezoidal or U-shaped cross-sections and varying depths and widths to ensure effective pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the degassing device is opened by internal pressure to discharge gas, then gas discharge function is improved, but the degassing device may be caught by surrounding structures (busbar, housing, gas/heat discharge passage) and cannot open sufficiently
Solution Approach 1:
The degassing device is divided into multiple independent hinge portions (first hinge portion, second hinge portion, third hinge portion) that can rotate independently. This segmentation allows each portion to navigate around obstacles separately, preventing the device from being caught by surrounding structures while maintaining gas discharge functionality.
Solution Approach 2:
The degassing device incorporates multiple rotating hinge portions that enable dynamic movement and adaptation during the opening process. The device can change its configuration from a closed state to an opened state through sequential rotation of hinge portions, allowing it to dynamically avoid obstacles in the gas discharge path.
2Reliability
If the degassing device is caught by surrounding structures, then gas discharge area is limited, but this may damage wire, cause short circuit, or block gas/heat discharge passage
Solution Approach 1:
By dividing the degassing device into multiple hinge portions that can rotate independently, the device can navigate around obstacles without forcing them aside. This reduces the risk of damaging surrounding components such as wires and gas/heat discharge passages while maintaining adequate gas discharge area.
Solution Approach 2:
The hinge portions act as intermediaries that mediate between the internal pressure force and the surrounding structures. Instead of the degassing device directly contacting and potentially damaging surrounding components, the hinge portions facilitate controlled movement through rotation, preventing harmful interactions.
Data Source
AI summary
A secondary battery includes a case with an opening therein, an electrode assembly accommodated in the case, a cap plate bonded to the opening of the case, a degassing device bonded to a gas discharge hole in one of the case and the cap plate to discharge gas from inside the case, wherein the degassing device includes a central portion exposed to an outside of the case through the gas discharge hole, a bonding portion bonded to a circumferential periphery of the gas discharge hole, a peripheral portion that is a surface for connecting the bonding portion and the central portion, a notch in the peripheral portion along an outline of the bonding portion, a main hinge on a line defined by the notch, and one or more sub-hinges parallel to the main hinge at one or more locations spaced apart from the main hinge.