Battery Cell Annular Tab Layout for Shorter Current Paths
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Solution Overview
Problem
Existing battery cells face challenges in improving overcurrent capability and charging efficiency due to long conductive paths and excessive internal resistance, particularly when connecting electrode terminals to tabs.
Innovation Solution
A battery cell design that includes a current collecting member connecting the electrode terminal to a first annular portion of the tab, with specific geometric configurations to reduce conductive path length and enhance current density uniformity, along with strategic recesses and welded portions to minimize resistance and improve assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode terminal connection structure is used, then the assembly process is simple, but the conductive path is long and internal resistance is high
Solution Approach 1:
The patent transforms the conventional linear connection structure into a three-dimensional spatial arrangement by positioning the electrode terminal at the center of the cover and routing current collecting members through the central axis, creating a radial current collection geometry that shortens the conductive path length
Solution Approach 2:
The current collecting member acts as an intermediary component that bridges the electrode terminal and the electrode assembly tabs, providing an optimized conduction path that reduces internal resistance while maintaining structural simplicity
2Ease of manufacture
If the electrode terminal is positioned at the center of the cover, then the positioning precision requirement is reduced and assembly is simplified, but the alignment with tabs must be precise
Solution Approach 1:
The central positioning of the electrode terminal creates a symmetric geometric relationship with the tabs, where the central axis serves as a reference that simplifies positioning while the current collecting member design ensures uniform current distribution to reduce sensitivity to alignment variations
3Productivity
If the current collecting member is positioned between the cover and the first annular portion, then the conductive path is shortened and overcurrent capability is improved, but the internal structure becomes more complex
Solution Approach 1:
The current collecting member integrates multiple functions: it serves as both a structural support element and an electrical conduction path, merging the mechanical and electrical functions into a single component that reduces overall system complexity while improving charging efficiency
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 design shortens conductive paths, reduces internal resistance, and enhances overcurrent capability and charging efficiency, while simplifying the assembly process and increasing energy density.
Implementation Method 1
a current collecting member which is at least partially located between the cover and the first annular portion, wherein the current collecting member is configured to connect the first annular portion to the electrode terminal
Implementation Method 2
The first annular portion is welded to the current collecting member to form a first welded portion
Data Source
AI summary
The present application provides a battery cell, a method and system for manufacturing the battery cell, a battery, and a power consuming device. The battery cell according to an embodiment of the present application comprises: an electrode assembly comprising a first tab, wherein the first tab is arranged around a central axis of the electrode assembly; a housing configured to accommodate the electrode assembly, wherein the housing comprises a barrel and a cover connected to the barrel, the barrel is arranged around a periphery of the electrode assembly, the cover is provided with an electrode lead-out hole, the central axis extends in a first direction and passes through the electrode lead-out hole, the first tab comprises a first annular portion, the first annular portion is arranged opposite to the cover.