Battery Unit Housing and Tab Layout for Corrosion and Resistance
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Solution Overview
Problem
Battery housings, typically made of aluminum, corrode due to reactions with lithium, and the integral design of electrode tabs leads to high impedance and resistance in current flow.
Innovation Solution
The battery unit design includes a housing with an electrified positive electrode tab connected to the housing, and electrode tabs with multiple connection pieces to optimize current paths and reduce direct current resistance, preventing corrosion and impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the aluminum shell is used as the housing for the battery, then the housing provides structural support and containment, but the aluminum shell corrodes due to reaction with lithium during battery operation
Solution Approach 1:
An insulation layer is introduced as an intermediary between the aluminum shell and the battery core. This insulation layer prevents direct contact between aluminum and lithium, blocking the harmful chemical reaction that causes corrosion. The insulation layer maintains the structural integrity provided by the aluminum shell while protecting it from degradation, thereby extending battery service life.
2Ease of manufacture
If the positive electrode tab and negative electrode tab are designed as an integral structure, then the structure is simplified and easier to manufacture, but the direct current resistance and impedance increase due to the resistance of the aluminum shell
Solution Approach 1:
The battery unit is divided into electrically isolated modules: the battery core, the insulation layer, and separate electrode terminals. The positive and negative electrode tabs are no longer integrated through the aluminum shell but are instead separated and independently connected to their respective terminals. This segmentation eliminates the high-resistance path through the aluminum shell, reducing direct current resistance and impedance while maintaining manufacturing feasibility through modular assembly.
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 electrified housing prevents corrosion, and the optimized current path reduces internal resistance, extending the battery's service life and improving performance.
Implementation Method 1
the positive electrode tab is electrically connected to the housing... the housing is electrified to prevent the housing from being corroded
Implementation Method 2
each of an end of the first electrode tab and/or an end of the second electrode tab away from the electrode core includes multiple connection pieces spaced apart... the optimized current path reduces internal resistance
Data Source
AI summary
A battery unit includes a housing, an electrode core, a first electrode terminal, and a second electrode terminal. A chamber is defined in the housing. The electrode core is arranged in the chamber, the electrode core includes a first electrode tab and a second electrode tab, one of the first electrode tab and the second electrode tab is a positive electrode tab, the other one of the first electrode tab and the second electrode tab is a negative electrode tab, the positive electrode tab is physically and electrically connected to the housing, and each of an end of the first electrode tab and/or an end of the second electrode tab away from the electrode core includes multiple connection pieces spaced apart. The first electrode terminal is electrically connected to the first electrode tab. The second electrode terminal is electrically connected to the second electrode tab.