Battery Electrode Assembly With Bendable Conductors and Low Resistance
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Solution Overview
Problem
The existing methods for connecting anode and cathode foils to battery terminals in battery cells require lengthening of the arresters, leading to increased weight, larger cell casing volume, and higher ohmic resistance, making it difficult to bend the flag-shaped packages and limiting the minimum bending radius.
Innovation Solution
The electrode arrangement features anode and cathode arresters that are partially connected in sections with bending sections allowing flexible folding, reducing the required length and enabling compact design and reduced ohmic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the anode and cathode arresters are fully welded to form a solid body, then the structural strength is improved, but the flexibility for bending is worsened and the minimum bending radius is increased
Solution Approach 1:
The flag packs are divided into multiple individual layers instead of being fully welded into a solid body. This segmentation allows each layer to be bent independently, providing flexibility while maintaining structural integrity through selective welding at specific locations.
Solution Approach 2:
Welding is applied locally at specific positions rather than across the entire surface. The flag packs are welded at their ends to form connecting sections, while leaving bending sections unwelded to maintain flexibility. This local quality approach resolves the contradiction by providing strength where needed and flexibility where required.
2Ease of operation
If the anode and cathode arresters are lengthened to facilitate bending, then the flexibility for bending is improved, but the weight and ohmic resistance are increased
Solution Approach 1:
The arresters are segmented into connecting sections and bending sections. The bending sections consist of multiple unwelded individual layers that can be folded with a small bending radius without requiring increased length, thereby avoiding the weight penalty associated with longer arresters.
Solution Approach 2:
The structure transitions from a rigid fully-welded solid body to a dynamic configuration with unwelded bending sections. This allows the flag packs to be bent and folded during assembly without requiring excessive length, reducing the overall weight while maintaining the ability to achieve the necessary bending.
3Ease of operation
If the anode and cathode arresters are lengthened to facilitate bending, then the flexibility for bending is improved, but the required internal volume of the cell casing is increased
Solution Approach 1:
By segmenting the flag packs into individual layers with selective welding, the structure achieves bendability without requiring excessive length. This segmentation allows the arresters to be folded into compact configurations, reducing the internal volume requirement of the cell casing.
Solution Approach 2:
The dynamic configuration with unwelded bending sections enables compact folding and bending during assembly. This eliminates the need for excessively long arresters, thereby reducing the internal volume required for the cell casing while maintaining the necessary flexibility for bending operations.
4Ease of operation
If the anode and cathode arresters are lengthened to facilitate bending, then the flexibility for bending is improved, but the ohmic resistance is increased
Solution Approach 1:
The segmentation into connecting sections and bending sections allows the current path to be optimized. The connecting sections provide electrical connection while the unwelded bending sections maintain low resistance by avoiding unnecessary length, thereby reducing overall ohmic resistance while preserving bendability.
Solution Approach 2:
The dynamic structure with selective welding allows the arresters to achieve the necessary bending without excessive length. This reduces the ohmic resistance by minimizing the total length of the conductive path while maintaining the flexibility required for bending during assembly.
Data Source
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AI summary
The invention relates to an electrode arrangement, particularly for a battery cell, comprising at least one electrode pack with a plurality of anode foils and cathode foils separated from one another by separator foils, wherein the anode foils have anode arresters at their ends and the cathode foils have cathode arresters at their ends, which project along a longitudinal direction on opposite sides of the electrode pack, wherein the anode arresters project on a first side and are connected to one another by at least two connecting sections spaced apart from one another by at least one bending section, and/or wherein the cathode arresters project on a second side of the electrode pack and are connected to one another by at least two connecting sections spaced apart from one another by at least one bending section. The invention further relates to a battery cell and a method for manufacturing battery cells.