Battery Cell Electrode Unit with Side Collectors for Gas Venting
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Solution Overview
Problem
Lithium-ion battery cells face issues with gas buildup and pressure due to internal faults, leading to potential deformation and bloating of the cell housing, and existing manufacturing processes for electrode units are complex and costly.
Innovation Solution
A battery cell design featuring an electrode unit with alternately layered anode and cathode sheets, bent at the bottom side and open at the end face, allowing gases to escape through a rupture opening and simplifying production by reducing stacking complexity, and incorporating a functional layer for monitoring without obstruction by collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode unit is designed with collectors protruding from multiple sides, then electrical connection is improved, but gas escape paths are blocked and pressure buildup occurs
Solution Approach 1:
The patent extracts the collectors from the end face area where gas escape is needed. Specifically, the end face is designed to be substantially free of collectors, allowing gas to escape unimpeded through the rupture opening while collectors are positioned only on the side faces to provide electrical connection without blocking gas paths.
2Stability of the object's composition
If traditional stacking methods are used for electrode units, then structural integrity is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The patent segments the electrode unit into distinct functional zones: side faces with collectors for electrical connection and an end face free of collectors for gas escape. This segmentation allows simplified manufacturing where the end face can be directly formed without complex stacking operations, while side faces maintain collector structures for electrical function.
Solution Approach 2:
Instead of the conventional approach where collectors are distributed across all faces including the end face, the patent inverts the design by positioning collectors only on side faces and leaving the end face substantially free of collectors. This inversion simplifies manufacturing and enables direct gas escape paths.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a battery cell (2) comprising a cell housing (11) having a rupture opening (33) and an electrode assembly (10) having an anode (5) and a cathode (3), wherein the anode (5) and the cathode (3) each comprise several layers which are alternately stacked on top of each other, wherein the electrode assembly (10) has a bottom side (94) at which the layers of the anode (5) and the cathode (3) are bent over, and an open end side (96) opposite the bottom side (94). The anode (5) is connected to a first collector (7) at a first narrow side (91) of the electrode assembly (10), the cathode (3) is connected to a second collector (9) at a second narrow side (92) of the electrode assembly (10) opposite the first narrow side (91), and the end side (96) faces the rupture opening (33).