Lithium Polymer Battery Layering Unit Cells with Oppositely Bent Terminals
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Solution Overview
Problem
Conventional methods for connecting lithium polymer batteries in series are inefficient and prone to environmental damage due to the fragility of the pouches and the need for additional connecting devices, which can lead to instability and susceptibility to external shocks.
Innovation Solution
A battery system where the anode and cathode terminals of each unit cell are oppositely bent and connected, allowing for series connection without additional devices, using a main and cover frame to securely hold and layer the cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional connecting devices are used to connect lithium polymer batteries in series, then the connection reliability is improved, but the device complexity and susceptibility to environmental damage increase
Solution Approach 1:
The patent merges the battery cell structure with the connection function by providing electrode terminals that extend directly from the pouch surface. The terminals are oppositely bent to enable direct series connection between adjacent cells, eliminating the need for separate connecting devices like tabs or wires. This integration reduces component count and potential failure points while maintaining connection reliability.
Solution Approach 2:
The patent extracts the connection function from separate external components and embeds it directly into the battery cell structure itself. The electrode terminals are designed with bent portions that protrude from the pouch, allowing the cells to connect to each other through their own structural features rather than requiring external connectors.
2Adaptability or versatility
If pouches are made flexible for various shapes, then the adaptability is improved, but the structural strength and resistance to external shocks deteriorate
Solution Approach 1:
The patent applies local quality by providing a rigid support frame structure that surrounds and supports the flexible pouch at critical locations. The pouch remains flexible in its main body for shape adaptability, while the frame provides localized structural strength and shock resistance where needed, particularly at the terminal connection points and along the edges.
Solution Approach 2:
The patent creates a composite structure combining the flexible pouch material with a rigid support frame. This composite design allows the battery to exhibit both the flexibility of the pouch and the structural integrity of the frame, resolving the contradiction between adaptability and strength.
3Ease of operation
If electrode terminals are extended from pouch surface, then the ease of connection is improved, but the susceptibility to environmental damage increases
Solution Approach 1:
The patent applies preliminary action by pre-bending the electrode terminals in opposite directions before the battery is assembled and connected. This preliminary configuration allows the terminals to be ready for immediate connection when batteries are stacked, eliminating the need for additional bending or adjustment during assembly and reducing the risk of damage during the connection process.
4Power
If multiple batteries are layered and connected in series, then the power output is improved, but the stability and resistance to external shocks deteriorate
Solution Approach 1:
The patent segments the battery system into modular unit cells, each with self-contained terminals that extend from the pouch. These modular units can be stacked in series to achieve desired power output while maintaining individual structural integrity. The segmentation allows each cell to be independently supported by the frame structure, improving overall stability.
Solution Approach 2:
The patent implements a nested structure where multiple battery cells are stacked within a common support frame. The frame structure encompasses and protects all the layered cells, providing external shock resistance and structural stability to the entire assembly while allowing the cells to maintain their individual flexible pouch structures.
Data Source
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AI summary
Disclosed herein is a structure of layering unit cells for a lithium polymer battery, in which electrode terminals are provided on surfaces of the respective unit cells for the lithium polymer battery, and are alternately layered, thus allowing the unit cells to be connected in series through only a layering operation without an additional connecting device. The battery system includes first and second unit cells each having a pouch and anode and cathode terminals which are connected to a surface of the pouch and are oppositely bent in upward and downward directions. In this case, the cathode terminal of the second unit cell is directly connected to the anode terminal of the first unit cell.