End Cover Lower Plastic Structure for Thin Battery Electrolyte Flow
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Solution Overview
Problem
Current end cover assemblies in secondary batteries, particularly the lower plastic parts, face challenges in optimizing energy density per volume due to their thin design, which affects the overall performance and efficiency of energy storage devices.
Innovation Solution
The design of a lower plastic part with specific features such as grooves, stream guidance holes, ejector pin parts, and injection molding parts enhances insulation and electrolyte management, improving energy storage efficiency and reducing production costs through improved injection molding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lower plastic part is designed to be very thin to improve battery energy density per volume, then the energy density per volume increases, but the structural integrity and insulation performance deteriorate
Solution Approach 1:
The lower plastic part is segmented into multiple functional regions including grooves, protrusions, and recesses that divide the structure into distinct zones for insulation, electrolyte management, and mechanical support. This segmentation allows each zone to optimize its function without requiring increased overall thickness
Solution Approach 2:
Different regions of the lower plastic part are designed with locally optimized properties - grooves provide enhanced insulation pathways, protrusions offer mechanical support points, and recesses facilitate electrolyte flow. This local quality approach maintains structural integrity in critical areas while keeping the overall part thin
2Volume of moving object
If the lower plastic part is designed to be very thin to improve battery energy density per volume, then the energy density per volume increases, but the insulation performance deteriorates
Solution Approach 1:
The insulation function is extended from a simple thickness dimension to a three-dimensional network of grooves and protrusions. This dimensional transformation creates multiple insulation pathways and barriers within the thin structure, maintaining insulation performance without increasing overall thickness
Solution Approach 2:
Insulation properties are locally enhanced through strategically placed grooves and protrusions that create thermal barriers at critical locations, ensuring reliable insulation performance in specific areas without requiring uniform thickness increase throughout the entire part
3Reliability
If complex features are added to the lower plastic part to improve electrolyte management, then electrolyte flow optimization improves, but manufacturing complexity increases
Solution Approach 1:
Multiple functions including electrolyte flow channels, insulation barriers, and mechanical support structures are merged into a single integrated lower plastic part. This consolidation achieves complex electrolyte management functionality without requiring separate components, thereby limiting the increase in overall device complexity
Solution Approach 2:
The lower plastic part is designed as a multi-functional component that simultaneously provides insulation, electrolyte flow management, and mechanical support. This universality approach allows a single part to perform multiple functions that would otherwise require separate components, balancing functionality with manufacturing feasibility
Data Source
AI summary
The present disclosure provides a lower plastic part, an end cover assembly, an energy storage device, and electrical equipment. The lower plastic part has a first surface and a second surface opposite to the first surface. The lower plastic part defines a groove, a stream guidance hole, and a concave portion. The groove and the concave portion are located at opposite ends of the lower plastic part in its length direction. The stream guidance hole penetrates through a bottom wall of the groove. A hole diameter of the stream guidance hole is progressively smaller. The lower plastic part further comprises a plurality of first ejector pin parts, a plurality of second ejector pin parts, and a plurality of third ejector pin parts which are symmetrical with respect to a center line of the lower plastic part in a width direction.