Long-Width Secondary Battery Electrode Assembly for Lower Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Long width secondary batteries used in electric vehicles and hybrid vehicles face high resistance due to the long widths of their cathode and anode plates, leading to significant electrical output losses.
Innovation Solution
The battery design incorporates additional electrode assemblies and conductive members with increased thickness and cross-sectional areas to reduce resistance, with conductive members connecting uncoated portions of the plates to provide enhanced current movement paths, and a support member to improve assembly efficiency and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the width of cathode plate and anode plate is increased to achieve long width secondary battery, then the battery can be used in electric vehicles or hybrid vehicles requiring high energy, but the current movement path becomes longer and resistance increases
Solution Approach 1:
The battery is divided into multiple electrode assemblies arranged in series, with each assembly having optimized plate dimensions. The current collectors are segmented into multiple sections with uncoated portions that facilitate shorter current paths. This segmentation allows the battery to achieve high energy capacity through multiple assemblies while maintaining lower resistance within each individual assembly.
Solution Approach 2:
The patent introduces additional current movement paths by utilizing the width dimension of the current collectors. Uncoated portions are created on the width-wise surfaces of current collectors, allowing current to travel across the width rather than only along the length, effectively shortening the current path in the length direction while maintaining the long width configuration.
2Power
If additional electrode assemblies and conductive members are added to reduce resistance, then electrical output is enhanced, but device complexity increases
Solution Approach 1:
Multiple electrode assemblies are merged into a single battery structure with shared current collectors and separators. The current collectors serve dual purposes as both structural support and current conduction pathways. Conductive members are integrated directly into the current collector structure, eliminating separate connection components and reducing overall device complexity.
Solution Approach 2:
The current collectors perform multiple functions: they provide structural support for the electrode plates, serve as current conduction pathways, and act as separators between adjacent electrode assemblies. The uncoated portions of current collectors simultaneously provide mechanical alignment and create additional current movement paths, reducing the need for separate conductive components.
3Reliability
If current collectors have uncoated portions for conductive members, then resistance is reduced through enhanced current paths, but manufacturing precision requirements increase
Solution Approach 1:
The uncoated portions are created during the current collector preparation stage before electrode plate assembly. This preliminary action allows for precise control of the uncoated area dimensions and positions, ensuring consistent current path lengths across all battery assemblies. The masking and coating processes are optimized to create uniform uncoated zones that facilitate reliable current conduction.
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
This design effectively reduces the resistance of the long width secondary battery, enhancing electrical output and assembly efficiency while maintaining a strong and efficient structure.
Implementation Method 1
the first cathode uncoated portion and the second cathode uncoated portion are connected to a cathode tab positioned on a second side of the first electrode assembly by a cathode conductive member, and the first anode uncoated portion and the second anode uncoated portion are connected to an anode tab positioned on a first side of the second electrode assembly by an anode conductive member
Data Source
AI summary
In the present invention, not only a movement path of a current generated from a first electrode assembly, but also a movement path of a current generated from a second electrode assembly are provided by a cathode conductive member, and not only a movement path of the current generated from the second electrode assembly, but also a movement path of the current generated from the first electrode assembly are provided by an anode conductive member, such that cross sectional areas of the correct movement paths are increased. Therefore, a resistance of the long width secondary battery may be reduced.