Flexible Thin Battery Electrode Group With Lower Flexural Modulus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional thin batteries lack the necessary flexibility for use in devices that operate in contact with the human body, and reducing the thickness of the active material layer in the electrode group does not provide a high-capacity battery solution.
Innovation Solution
An electrode group design featuring a sheet-like first electrode with a sheet-like second electrode laminated on both surfaces, an electrolyte layer in between, and a pouch-like housing, where the second electrode has a lower flexural modulus than the first electrode, allowing for high flexibility and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrode group is made thinner by forming an active material layer using a vapor phase process, then the flexibility of the electrode group is improved, but the capacity of the battery is reduced
Solution Approach 1:
The patent transitions from a conventional single-layer electrode structure to a three-dimensional stacked configuration where multiple second electrodes are arranged in layers around the first electrode. This dimensional change allows the battery to maintain thinness and flexibility while increasing the total active material volume and capacity through vertical stacking rather than horizontal expansion.
Solution Approach 2:
The patent implements a nested structure where multiple second electrodes are stacked around the central first electrode, with electrolyte layers interposed between them. This nesting arrangement maximizes the use of space within the thin battery form factor, allowing multiple active material layers to be contained within a compact volume while maintaining overall thinness.
2Ease of manufacture
If conventional electrode group structures are used, then the battery can be manufactured with standard processes, but the flexibility required for devices that operate in contact with human body cannot be achieved
Solution Approach 1:
The patent employs thin-film construction for all electrode components, with the entire electrode group achieving a thickness of 1.0 mm or less. The use of vapor phase deposition processes creates uniformly thin active material layers that inherently possess the flexibility required for wearable applications, while the laminated structure of multiple thin layers maintains manufacturability through established thin-film fabrication techniques.
Solution Approach 2:
The patent utilizes vapor phase deposition parameters to control the thickness and morphology of active material layers, achieving optimal balance between flexibility and capacity. By adjusting deposition conditions such as temperature, pressure, and material flux, the process produces thin films with controlled mechanical properties that enable flexibility while maintaining sufficient active material content for adequate capacity.
Data Source
AI summary
Provided is a high-capacity and highly-flexible electrode group for thin batteries, a thin battery including the electrode group, and an electronic device in which the thin battery is incorporated.The electrode group for thin batteries includes: a sheet-like first electrode, a sheet-like second electrode being laminated on each of both surfaces of the first electrode, and an electrolyte layer interposed between the first electrode and the second electrode. The second electrode has a polarity opposite to that of the first electrode. The second electrode has a flexural modulus lower than that of the first electrode. The thin battery includes the electrode group, and a pouch-like housing accommodating the electrode group. The electronic device includes an electronic device main body with flexibility, and the thin battery is incorporated in the electronic device main body.