Battery Pack Fragile Support Frame Switching Mechanism
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Solution Overview
Problem
Battery packs in existing technologies can abnormally swell or generate high-temperature heat, leading to potential explosion or ignition when short-circuited due to overcharging or external impacts, posing a risk of explosion and ignition.
Innovation Solution
A battery pack design incorporating a fuse and a switching device with a fragile support frame, where the support frame breaks to connect copper plates, generating heat to melt and break a fuse, disconnecting the battery module from the electronic device to prevent further current and heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery module is designed with simple structure without protective devices, then the device complexity is reduced, but the reliability decreases due to risk of explosion or ignition from overcharging or short-circuit
Solution Approach 1:
The support frame is designed with fragility to break in advance under abnormal conditions (overcharging or external impact), triggering the switching device to disconnect the battery module before explosion or ignition can occur. This preliminary protective action resolves the contradiction by pre-positioning a failure mechanism that activates only when needed.
Solution Approach 2:
The support frame acts as an intermediary element between the battery cell and the switching device. It transmits the swelling force from the battery cell to the switching device, enabling indirect control and protection without requiring direct complex sensing mechanisms.
2Reliability
If a switching device with support frame is added to protect against overcharging, then the reliability improves, but the device complexity increases
Solution Approach 1:
The switching device utilizes the physical swelling of the battery cell itself as the triggering mechanism. The battery cell's own abnormal expansion directly breaks the fragile support frame, eliminating the need for external sensors or complex control systems to detect overcharging conditions.
Solution Approach 2:
The support frame is designed with specific fragility parameters that cause it to break at predetermined stress levels. This parameter-based design allows the protective device to activate automatically when the battery cell swelling exceeds safe thresholds, providing reliable protection through material property selection rather than complex control logic.
3Speed
If the support frame is made fragile to enable automatic switching, then the responsiveness to abnormal conditions improves, but the strength of the support structure deteriorates
Solution Approach 1:
The support frame exhibits different mechanical properties in different aspects: it has sufficient strength to support normal operational loads and maintain structural integrity, but possesses localized fragility in specific regions that allows it to break when subjected to abnormal swelling forces. This spatial differentiation of mechanical properties resolves the contradiction between strength and responsiveness.
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
Effectively prevents battery explosion or ignition by cutting off power during short-circuits and overcharging, ensuring safety by preventing additional current and heat accumulation.
Implementation Method 1
when the battery cell swells, the first plate deformed together with the battery cell breaks the support frame having the fragility
Implementation Method 2
the fuse is broken by high-temperature heat generated by connecting the first electrode terminal of the uppermost battery cell to the second electrode terminal of the lowermost battery cell
Data Source
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AI summary
The present invention relates to a battery pack connected to an electronic device. The battery pack comprises: a battery module provided with a plurality of battery cells which are disposed adjacent to each other and connected to each other in series and on which first and second electrode terminals are disposed, wherein the first electrode terminal of the uppermost battery cell is connected to a second electrode terminal of the electronic device, and the second electrode terminal of the lowermost battery cell is connected to a first electrode terminal of the electronic device; a fuse disposed between the first electrode terminal of the uppermost battery cell and the second electrode terminal of the electronic device; and a switching device provided with a first plate disposed on a top surface of the uppermost battery cell and connected to the first electrode terminal of the uppermost battery cell, a second plate disposed above the first plate and connected to the second electrode terminal of the lowermost battery cell, and a support frame disposed between the first plate and the second plate and having fragility.