Battery End Cover Assembly With Two-Stage Pressure Relief
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Solution Overview
Problem
Existing explosion-proof valves or sheets in energy storage apparatuses, such as batteries, often cause electrolyte leakage when burst, leading to pollution, and existing stimulus-response members fail to effectively short-circuit electrodes at critical pressure points, risking explosion.
Innovation Solution
An energy storage apparatus with a stimulus-response member and an explosion-proof sheet, where the stimulus-response member short-circuits the apparatus at a first pressure value and the explosion-proof sheet bursts at a second pressure value, with a controlled ratio between these values to ensure safe operation and prevent electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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 divided into two separate components: a stimulus-response member that short-circuits at a first pressure value (0.3-0.6 MPa) and an explosion-proof sheet that bursts at a second pressure value (0.6-1.0 MPa). This segmentation ensures that the short-circuiting action prevents further pressure buildup before the explosion-proof sheet needs to burst, thereby preventing electrolyte leakage.
Solution Approach 2:
The stimulus-response member performs a preliminary short-circuiting action when the pressure reaches the first pressure value, which is lower than the pressure required to burst the explosion-proof sheet. This preliminary action prevents the pressure from reaching the dangerous level that would cause electrolyte leakage, while the explosion-proof sheet remains intact.
2Reliability
If a stimulus-response member is designed to short-circuit electrodes at critical pressure points, then explosion prevention is improved, but existing designs fail to effectively short-circuit at the appropriate pressure values
Solution Approach 1:
The stimulus-response member is designed with specific thickness parameters: the minimum thickness of the deformation part is less than the thickness of the abutting part and connecting part. The deformation part thickness ranges from 0.3-1.0 mm, the abutting part thickness ranges from 1.6-3.4 mm, and the connecting part thickness ranges from 0.45-1.5 mm. These parameter variations ensure that the deformation part deforms first at the lower first pressure value (0.3-0.6 MPa) to initiate short-circuiting, while the thicker abutting and connecting parts maintain structural integrity.
Solution Approach 2:
Different parts of the stimulus-response member have different thicknesses to perform different functions: the deformation part has minimum thickness to deform and initiate short-circuiting at the lower pressure, while the abutting part has greater thickness to maintain contact force, and the connecting part has intermediate thickness to provide structural support. This local quality differentiation ensures precise control over the short-circuiting pressure point.
3Ease of manufacture
If the explosion-proof sheet is made with uniform thickness, then manufacturing is simplified, but the sheet may burst at incorrect pressure values or cause uncontrolled explosion
Solution Approach 1:
The explosion-proof sheet is designed with non-uniform thickness: the outer periphery portion has greater thickness (0.5-0.6 mm) to maintain structural integrity and seal the through hole, while the center portion has reduced thickness (0.25-0.35 mm) to allow bursting at the predetermined second pressure value (0.6-1.0 MPa). The notch in the center portion further facilitates controlled bursting. This local quality differentiation ensures reliable pressure control while maintaining manufacturability.
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 apparatus effectively prevents electrolyte leakage and explosion by short-circuiting at the appropriate pressure and bursting the sheet to release pressure safely, ensuring double insurance against excessive pressure buildup.
Implementation Method 1
The deformation part is bent from an end of the connecting part away from the top cover in a direction away from the metal block. The abutting part is configured to abut against the metal block to short-circuit the energy storage apparatus in response to the energy storage apparatus reaching the first pressure value.
Implementation Method 2
The explosion-proof sheet is configured to burst in response to the energy storage apparatus reaching a second pressure value. The explosion-proof sheet is provided with a notch.
Data Source
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 falls within a range of the preset surface.