Battery End Cover Assembly With Pressure-Triggered Short-Circuit Venting
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Solution Overview
Problem
Existing energy storage apparatuses face issues with electrolyte leakage and explosion due to the bursting of explosion-proof valves or sheets, which can lead to pollution and safety hazards, and existing stimulus-response members fail to effectively short-circuit the apparatus at appropriate pressure thresholds.
Innovation Solution
The energy storage apparatus incorporates a stimulus-response member that deforms and flips over to short-circuit the positive and negative electrodes when internal pressure reaches a first threshold, and if pressure continues to rise, an explosion-proof sheet bursts to relieve pressure, with a controlled ratio of these thresholds to ensure safety, providing a double-insurance mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If an explosion-proof valve or explosion-proof sheet is disposed on the end cover assembly to relieve pressure when internal air pressure increases, then pressure relief function is improved, but electrolyte leakage and pollution occur when the valve or sheet bursts
Solution Approach 1:
The pressure relief function is segmented into two independent components: a stimulus-response member for early warning short-circuiting at a first pressure threshold, and an explosion-proof sheet for final pressure relief at a second pressure threshold. This segmentation allows each component to operate at different pressure levels, preventing electrolyte leakage by activating the short-circuit before the explosion-proof sheet bursts.
Solution Approach 2:
The stimulus-response member performs a preliminary action by deforming and causing short-circuiting when the internal air pressure reaches the first pressure threshold (P1), which occurs before the second pressure threshold (P2). This preliminary short-circuiting action stops charging/discharging in advance, preventing the pressure from reaching the level that would cause the explosion-proof sheet to burst and electrolyte to leak.
2Reliability
If a stimulus-response member is designed to short-circuit the energy storage apparatus when pressure reaches a threshold, then safety is improved, but the apparatus may short-circuit excessively early affecting normal use
Solution Approach 1:
The design changes the pressure threshold parameter by establishing a specific ratio relationship between the first pressure threshold (P1) for stimulus-response member activation and the second pressure threshold (P2) for explosion-proof sheet bursting. By controlling P1 to be between 0.4P2 and 0.87P2, the short-circuiting occurs at an optimal pressure level that ensures safety while avoiding excessive early activation that would affect normal use.
3Stress or pressure
If the explosion-proof sheet is designed to burst at a specific pressure to relieve pressure, then pressure control is improved, but the sheet may burst during or before stimulus-response member flip-over
Solution Approach 1:
The design changes the pressure threshold parameter by establishing a specific ratio relationship between the first pressure threshold (P1) for stimulus-response member activation and the second pressure threshold (P2) for explosion-proof sheet bursting. By controlling P1 to be between 0.4P2 and 0.87P2, the patent ensures that the stimulus-response member activates first, followed by the explosion-proof sheet at a higher pressure, thereby preventing the sheet from bursting during or before member flip-over and achieving the double-insurance function.
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
This design prevents electrolyte leakage and explosion by ensuring timely short-circuiting and controlled pressure release, enhancing the safety and reliability of the energy storage apparatus.
Implementation Method 1
When a pressure in the energy storage apparatus reaches a first pressure value, the stimulus-response member deforms, and the center part of the stimulus-response member move towards the metal block and is flipped over
Data Source
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AI summary
The present disclosure provides an energy storage apparatus and a power-consuming device. The energy storage apparatus includes an electrode assembly, a connector, and an end cover assembly. The end cover assembly includes a pole assembly, a top cover, a stimulus-response member, and an explosion-proof assembly. The pole assembly includes a metal block, where the metal block is electrically connected to the connector, and the metal block has a preset surface. The top cover is disposed at an interval with the preset surface of the metal block, where the top cover defines a through hole and an explosion-proof hole arranged at an interval with each other, and an orthographic projection of the through hole on the preset surface fall within a range of the preset surface. The stimulus-response member seals the through hole and is connected to the top cover, where the stimulus-response member is configured to abut against the metal block to short-circuit the energy storage apparatus in response to the energy storage apparatus reaching a first pressure value. The explosion-proof assembly includes an explosion-proof sheet, where the explosion-proof sheet is configured to seal the explosion-proof hole and is connected to the top cover, and the explosion-proof sheet is configured to burst in response to the energy storage apparatus reaching a second pressure value. The range of a ratio of the first pressure value PI to the second pressure value P2 is 0.4 ≤ P1/P2 ≤ 0.87; and a thickness of the stimulus-response member is in a range of 0.1 mm to 6.2 mm.