Stacked Battery Packaging for Dual-End Current Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stacked-type batteries require a central portion of the laminate sheet to be cut off for current extraction, leading to increased production costs and waste.
Innovation Solution
A stacked-type battery design with conductive plates on both ends of the electrode stack, using laminate sheets that cover the peripheral edges without cutting the central portion, and incorporating resin layers for sealing and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a laminate sheet with a central opening is used for current extraction, then current can be extracted from both ends of the electrode stack, but the central portion of the laminate sheet must be cut off, increasing production cost and creating waste
Solution Approach 1:
The exterior package is divided into a body portion and a lid portion, with current extraction ports provided in both portions. This segmentation allows current to be extracted from both ends of the electrode stack without requiring a central opening that would waste laminate sheet material.
Solution Approach 2:
The current extraction function is extracted from the central region of the laminate sheet and relocated to the body portion and lid portion of the exterior package. This allows the laminate sheet to maintain its full rectangular shape without central cutouts, eliminating material waste.
2Ease of operation
If a laminate sheet with a central opening is used, then current extraction is enabled, but the production process becomes complicated due to cutting the central portion
Solution Approach 1:
The exterior package is segmented into body and lid portions, with current extraction ports distributed across both portions. This eliminates the need for complex central cutting operations while maintaining current extraction functionality.
Solution Approach 2:
Current extraction ports are preliminarily arranged in the body portion and lid portion before assembly, avoiding the need for post-assembly central opening creation and simplifying the manufacturing process.
3Ease of operation
If conductive plates are provided on both surfaces of the electrode stack, then current extraction from both ends is achieved, but the structure becomes more complex
Solution Approach 1:
The body portion and lid portion of the exterior package serve multiple functions: they provide structural enclosure and simultaneously house current extraction ports. This multi-functionality reduces overall structural complexity while enabling current extraction from both ends.
Solution Approach 2:
The current extraction function is merged with the body portion and lid portion structures, rather than being separate components. This integration simplifies the overall device structure while achieving the desired current extraction capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces production costs by minimizing laminate sheet waste and maintains excellent sealing properties while allowing current extraction from both ends, enhancing insulation and preventing short circuits.
Implementation Method 1
The sealant resin layer of each of the first sheets and the first resin layer of a corresponding one of the second sheets may be melted to each other
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A stacked-type battery includes: a stacked-electrode assembly including a plurality of electrodes stacked in a stacking direction; and an exterior package that accommodates the stacked-electrode assembly, wherein the exterior package includes a first conductive plate (18) provided on one surface of the stacked-electrode assembly in the stacking direction, a second conductive plate provided on the other surface of the stacked-electrode assembly in the stacking direction, a first laminate sheet portion joined to a peripheral edge of the first conductive plate, and a second laminate sheet portion joined to a peripheral edge of the second conductive plate, each of the first laminate sheet portion and the second laminate sheet portion includes one or more first sheets (31) and one or more second sheets (32), and the one or more first sheets (31) and the one or more second sheets (32) cover each of the peripheral edge of the first conductive plate (18) and the peripheral edge of the second conductive plate together in a state in which a part of each of the second sheets (32) is overlapped with a part of a corresponding one of the first sheets (31).