Battery Case Structure for Long Wound Electrode Assembly
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Solution Overview
Problem
The challenge is to reduce the load on an electrode assembly during assembly in energy storage devices, particularly when the electrode assembly is long in the winding-axis direction, as conventional methods face difficulties in accommodating and securing the assembly without increasing the load.
Innovation Solution
The energy storage device features a rectangular parallelepiped case with a lid formed from short side surfaces and a case body formed from three surfaces, allowing the electrode assembly to be easily positioned between the short side surfaces, with electrode terminals and current collectors strategically placed on the short side surfaces to facilitate assembly and reduce the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly is made longer in the winding-axis direction to increase energy storage capacity, then the energy storage capacity is improved, but it becomes difficult to accommodate the electrode assembly in the case during assembly and the load on the electrode assembly increases
Solution Approach 1:
The case is divided into a lid and a case body that can be assembled separately. The lid is formed of a pair of short side surfaces and one other surface, while the case body is formed of three surfaces, creating an open structure that facilitates insertion of long electrode assemblies without excessive load.
Solution Approach 2:
The case structure utilizes three-dimensional spatial arrangement with the lid forming the top and short sides, and the case body forming the bottom and long sides. This dimensional configuration creates an open assembly path that accommodates long electrode assemblies effectively.
2Quantity of substance
If the electrode assembly is made longer in the winding-axis direction to increase energy storage capacity, then the energy storage capacity is improved, but the load on the electrode assembly increases
Solution Approach 1:
By segmenting the case into lid and case body components that assemble together, the structure creates sufficient internal space and reduces constraints on the electrode assembly, thereby reducing the load while maintaining the ability to house longer assemblies for increased capacity.
Solution Approach 2:
The lid and case body are prepared as separate pre-formed components with specific geometries that, when assembled, create the optimal internal environment for the electrode assembly before the assembly process occurs, reducing load during insertion.
3Reliability
If the case is constructed as a complete enclosed structure to protect the electrode assembly, then the protection is improved, but the ease of assembly is reduced
Solution Approach 1:
The case is segmented into lid and case body portions that can be assembled in an open configuration to easily receive the electrode assembly, then closed to provide protection. This segmentation enables both easy assembly and adequate protection.
Solution Approach 2:
Instead of assembling a complete enclosed case and then trying to insert the electrode assembly, the case is assembled in an inverted manner where the lid and case body form an open structure first, allowing easy insertion, and then closed to provide protection.
Data Source
AI summary
An energy storage device includes: an electrode assembly formed by winding a plurality of plates; and a rectangular parallelepiped case housing the electrode assembly. The case is constructed by welding: a lid formed of a pair of short side surfaces of the case, which face each other in a winding-axis direction, and an other one surface of the case; and a case body formed of three surfaces, except for the pair of short side surfaces and the other one surface, of the case.