Single-Seal Secondary Battery Packaging for Higher Volumetric Density
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Solution Overview
Problem
Existing secondary batteries have not achieved sufficient energy density per unit volume, necessitating improvements in their configuration to enhance this critical performance metric.
Innovation Solution
A secondary battery design featuring a flexible outer package member with a flat and columnar shape, sealed at one end and containing a battery device with positive and negative electrode wiring lines led out via a common seal part, allowing for increased energy density through efficient use of internal space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a wound electrode body is contained inside an outer package material sealed at four sides or three sides, then downsizing is achieved, but energy density per unit volume is insufficient
Solution Approach 1:
The outer package member is divided into a body portion and a single seal part, separating the sealing function to one specific location. This segmentation allows the majority of the package volume to be utilized for active components, reducing wasted space and improving energy density while maintaining compact dimensions.
Solution Approach 2:
The patent transitions from multi-side sealing (3D spatial constraint on multiple faces) to single-end sealing (1D linear constraint at one end). This dimensional simplification frees up spatial arrangements, allowing electrode leads and other components to be optimally positioned without the constraints of multiple seal locations, thereby increasing volumetric efficiency.
2Quantity of substance
If a wound electrode body is contained inside a laminated-film outer package body sealed at two locations, then energy density is increased, but device complexity increases
Solution Approach 1:
The sealing function is extracted from multiple locations and concentrated into a single seal part. This extraction simplifies the overall package structure by eliminating redundant seal locations while maintaining the necessary sealing function, thereby reducing device complexity without compromising energy density.
Solution Approach 2:
The single seal part performs multiple functions: it seals the outer package, provides a common exit path for both electrode leads, and maintains structural integrity. This multi-functionality reduces the number of separate components needed, simplifying the overall device structure while preserving high energy density.
3Ease of operation
If electrode leads are led out from multiple seal locations, then ease of operation is improved, but dead space increases reducing energy density
Solution Approach 1:
Both the positive and negative electrode leads are merged into a single seal part for extraction. This combining of functions eliminates the need for multiple separate seal locations, reducing dead space and improving energy density while maintaining ease of operation through the common seal structure.
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
The described configuration increases energy density per unit volume by minimizing dead space and optimizing the arrangement of electrode leads, thereby enhancing the battery's overall performance.
Implementation Method 1
The outer package member has flexibility, and accommodates the battery device
Implementation Method 2
the outer package member is formed by a deep drawing process
Data Source
AI summary
A secondary battery includes a battery device, an outer package member, a positive electrode wiring line, and a negative electrode wiring line. The battery device includes a positive electrode and a negative electrode. The outer package member has flexibility, and accommodates the battery device. The outer package member includes a seal part at one end, and includes no seal part at any position other than the one end. The positive electrode wiring line is coupled to the positive electrode and led to an outside of the outer package member via the seal part. The negative electrode wiring line is coupled to the negative electrode and led to the outside of the outer package member via the seal part. The outer package member has a flat and columnar shape. In the seal part, mutually opposed portions of the outer package member are joined to each other.