Solid-State Battery Tab Winding for High-Capacity Cylindrical Cells
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Solution Overview
Problem
Conventional solid-state batteries face challenges in achieving high capacity and energy density due to the difficulty in producing a wound body with fragile electrodes, leading to increased components and reduced safety, especially when housed in cylindrical shapes.
Innovation Solution
A solid-state battery design featuring a multilayer body with spirally wound positive and negative electrode tabs on the outer surface, using a metal porous current collector, and incorporating an insulating material in the unfilled portion to prevent short-circuits and enhance connection reliability, allowing for uniform pressure application and high capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state battery is housed in a cylindrical outer body, then stress is not concentrated on the corner portion and restraining pressure can be uniformly applied, but it is difficult to produce a wound body because the electrode is hard and fragile
Solution Approach 1:
The battery structure is segmented into a multilayer body with stacked electrode layers and solid electrolyte layers, eliminating the need for a traditional wound body configuration. This segmentation allows the use of rigid electrodes while maintaining manufacturability and uniform pressure distribution in a cylindrical form factor.
Solution Approach 2:
Instead of winding flexible electrodes to create a cylindrical structure, the patent inverts the approach by stacking rigid electrode layers to form a multilayer body that is then housed in a cylindrical outer body. This inversion resolves the contradiction between structural integrity and manufacturing difficulty.
2Power
If a multilayer body including a plurality of electrodes is housed in a cylindrical-shaped outer body with series connection, then the cell has a high voltage, but the capacity is small and insulating components are required
Solution Approach 1:
Multiple electrode layers are merged into a single integrated multilayer body structure, allowing parallel connection of electrodes within the same physical unit. This merging enables high capacity while maintaining high voltage, eliminating the need for separate insulating components and parallel connector installations.
Solution Approach 2:
The patent transitions from a planar series/parallel connection approach to a three-dimensional multilayer stacking configuration. This dimensional change allows multiple electrodes to be connected in parallel within the same voltage level, achieving high capacity without requiring additional insulating components or complex external connections.
3Quantity of substance
If connectors are installed in parallel to increase capacity, then the capacity increases, but the number of components is increased resulting in lowering the energy density per module unit
Solution Approach 1:
The patent merges multiple electrode layers into a single integrated multilayer body, achieving high capacity through internal parallel connection without requiring external connectors. This merging dramatically reduces the number of components while maintaining high capacity, thereby improving energy density per module unit.
Data Source
AI summary
To provide a solid-state battery capable of achieving high capacity. A solid-state battery including a multilayer body including a stack of a plurality of electrode layers including positive electrode layers and negative electrode layers and solid electrolyte layers each disposed between the electrode layers, the multilayer body having a columnar shape; and the solid-state battery including a positive electrode terminal and a negative electrode terminal disposed at both end portions of the multilayer body; a positive electrode tab electrically connected to the positive electrode layer and the positive electrode terminal; and a negative electrode tab electrically connected to the negative electrode layer and the negative electrode terminal, wherein the positive electrode tab and the negative electrode tab are spirally wound on an outer peripheral surface of the multilayer body.