Battery Cell Housing Layout for Impact-Resistant Cover Plate Joints
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Solution Overview
Problem
The existing battery cell structures are vulnerable to external impacts, which can lead to failure of the connection between the cover plate and the housing, posing safety risks.
Innovation Solution
The battery cell design includes a housing with an electrode terminal on its bottom wall, a cover plate that fits and covers the opening of the housing, and a junction between the cover plate and the housing located far away from the electrode terminal. This configuration reduces the impact of external forces on the junction and enhances safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal is disposed on the bottom wall of the housing and the cover plate is connected to the housing, then the junction between the cover plate and the housing is located far away from the electrode terminal, but the structural complexity increases
Solution Approach 1:
The battery cell structure is segmented into distinct functional zones: the electrode terminal is positioned on the bottom wall while the cover plate connects to the housing at a distant location. This segmentation separates the electrical connection function from the structural closure function, reducing the risk that impact forces affecting one component will compromise the other.
Solution Approach 2:
The housing acts as an intermediary element that spatially separates the electrode terminal from the cover plate junction. By using the housing as a mediator, the design ensures that external impacts must traverse a longer path through the structural components, reducing the direct transmission of forces to critical connection points.
2Quantity of substance
If the cover plate is made thinner to reduce weight and volume, then the energy density increases, but the strength of the cover plate decreases
Solution Approach 1:
The cover plate is designed with non-uniform thickness distribution, featuring localized reinforcement at the junction area where it connects to the housing. This local quality enhancement ensures that the critical connection zone maintains high strength to resist impact forces, while the remaining portions of the cover plate remain thin to minimize weight and maximize energy density.
Solution Approach 2:
The cover plate utilizes composite material construction, combining materials with different mechanical properties to achieve optimal performance. The composite structure provides high strength-to-weight ratio, allowing the cover plate to be thin overall while maintaining sufficient strength at critical locations through strategically placed material layers or reinforcements.
Data Source
AI summary
This application provides a battery cell, a battery, and an electrical device, and enhances safety of the battery cell by improving the structure of the battery cell. The battery cell includes: a housing, on which an opening is created; an electrode assembly, accommodated in the housing; an electrode terminal, disposed on a bottom wall of the housing and connected to a tab of the electrode assembly, where the bottom wall is opposite to the opening; and a cover plate, connected to the housing and configured to fit and cover the opening.