Cell Stack Tape Layout to Reduce Battery Module Thickness
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Solution Overview
Problem
Existing cell stack assemblies in batteries suffer from reduced volumetric efficiency due to the increased thickness caused by the winding of fixing tapes around electrode assemblies and laminate exterior packagings.
Innovation Solution
The cell stack assembly is designed such that the winding positions of the fixing tapes, whether inner or outer, do not overlap in the stacking direction for adjacent battery cells, thereby minimizing the overall thickness and enhancing volumetric efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing tape is wound around electrode assemblies and laminate exterior packaging, then the electrode assemblies are securely fixed, but the thickness increases and volumetric efficiency decreases
Solution Approach 1:
The patent combines the inner fixing tape and outer fixing tape into an integrated fixing system where both tapes work together to secure the electrode assembly. The inner fixing tape is wound around the electrode assembly itself while the outer fixing tape is wound around the laminate exterior packaging, creating a merged fixing mechanism that provides reliable fixation without requiring excessive thickness from a single tape layer.
Solution Approach 2:
The patent implements a nested fixing structure where the inner fixing tape is positioned inside the laminate exterior packaging and the outer fixing tape is positioned outside the laminate exterior packaging. This nested arrangement allows the fixing tapes to be layered concentrically, minimizing the overall thickness increase while maintaining secure fixation of the electrode assembly.
2Reliability
If fixing tape is wound onto laminate exterior packaging, then the electrode assembly is indirectly fixed, but the overall thickness increases
Solution Approach 1:
The patent merges direct fixing (inner fixing tape on electrode assembly) and indirect fixing (outer fixing tape on laminate exterior packaging) into a unified fixing system. This combination ensures that the electrode assembly is securely fixed through both direct and indirect mechanisms, while the distributed thickness of two thinner tapes is less than a single thick tape would require.
3Reliability
If multiple layers of fixing tape are used to ensure secure fixation, then fixing reliability improves, but volumetric efficiency decreases
Solution Approach 1:
The patent uses a nested arrangement where the inner fixing tape and outer fixing tape are positioned at different radial levels - one inside the laminate packaging and one outside. This nesting allows multiple fixing layers to coexist with minimal overall thickness increase, maintaining high volumetric efficiency while providing secure fixation through multiple tape layers.
Data Source
AI summary
A cell stack assembly, including: a plurality of stacked battery cells, each including an electrode assembly; a laminate exterior packaging that covers the electrode assembly and encloses the electrode assembly internally; and a fixing tape, including at least one of an inner fixing tape wound in a peripheral direction onto an outer peripheral face of the electrode assembly at an inner side of the laminate exterior packaging, or an outer fixing tape wound in a peripheral direction onto an outer peripheral face of the laminate exterior packaging, wherein: taking a direction in which the plurality of battery cells are stacked as a stacking direction, the fixing tape is wound such that winding positions of the fixing tape do not overlap in the stacking direction for at least one adjacent pair of the battery cells.