Secondary Battery Case With Variable Wall Thickness
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Solution Overview
Problem
Existing secondary batteries face challenges in maximizing capacity within a limited volume, as they often lack sufficient internal space to accommodate a larger amount of electrolyte.
Innovation Solution
The design of a secondary battery case with a unique configuration of short side walls, featuring a thicker bottom region and a thinner top region with a step, allows for increased internal space, enabling more electrolyte to be accommodated, thereby enhancing the battery's capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the case has a uniform thickness design, then the manufacturing is simple, but the internal space is reduced and capacity is limited
Solution Approach 1:
The case is designed with non-uniform thickness where the bottom region has a greater thickness than the top region. This local variation in thickness optimizes the distribution of internal space, allowing more electrolyte to be accommodated in the bottom region while maintaining structural integrity where needed.
Solution Approach 2:
The case structure transitions from a two-dimensional uniform thickness design to a three-dimensional variable thickness design. By introducing thickness variation along the vertical dimension, the internal volume is increased without significantly increasing the external footprint, thereby accommodating more electrolyte.
2Quantity of substance
If the internal space is increased to accommodate more electrolyte, then the capacity increases, but the structural integrity and stiffness may be compromised
Solution Approach 1:
The bottom region of the case is designed with greater thickness to provide enhanced structural support and stiffness. This localized reinforcement ensures that the case maintains its structural integrity while the overall internal volume is increased through the thickness variation.
Solution Approach 2:
The case may be constructed using composite materials or material structures that provide high strength-to-weight ratios. This allows the case to maintain sufficient structural integrity and stiffness while accommodating a larger internal volume for electrolyte storage.
Data Source
AI summary
A secondary battery including an electrode assembly, and a case, the case including a pair of long side walls facing each other, and a pair of short side walls at ends of the long side walls, and accommodating the electrode assembly in a space defined by the long side walls and the short side walls, each short side wall including a bottom region and a top region, the bottom region and top region each having a thickness, and the thickness of the bottom region being greater than the thickness of the top region.