Square Battery Case Pinching for Electrode Body Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing square type batteries face challenges in preventing the electrode body from moving within the case main body, which can lead to inefficiencies and potential damage.
Innovation Solution
The battery design incorporates a case main body with pairs of opposed side surfaces that are pinched inward to abut the electrode body, including narrow width surfaces with abutting parts and separation parts to stabilize the electrode, and a manufacturing method that deforms these surfaces to form abutting parts during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode body is accommodated in a case main body without side surface deformation, then the manufacturing process is simple, but the electrode body cannot be effectively suppressed from moving
Solution Approach 1:
The side surfaces of the case main body are pre-formed with pinched portions at specific positions before electrode body installation. These pinched portions create abutting surfaces that will engage with the electrode body, preventing movement in advance of any potential displacement issues.
Solution Approach 2:
The case main body features localized pinched portions at specific side surfaces rather than uniform deformation throughout. This local deformation creates targeted abutting surfaces at critical positions while maintaining the overall simplicity of the case structure elsewhere.
2Reliability
If the side surfaces are pinched inward to abut the electrode body, then electrode movement is suppressed, but the case main body structure becomes more complex
Solution Approach 1:
The pinched portions are formed on the side surfaces before electrode body installation, creating ready-to-eng age abutting surfaces. This preliminary structuring ensures proper electrode positioning without requiring complex assembly operations or additional components.
Solution Approach 2:
The pinched portions on the case main body automatically engage with the electrode body upon insertion, providing self-positioning and self-constraint functionality. The electrode body itself serves as the constraint surface, eliminating the need for separate retaining structures.
3Reliability
If all side surfaces are pinched inward, then electrode movement is fully restricted, but expansion space for the electrode body is reduced
Solution Approach 1:
Pinched portions are selectively formed only on specific side surfaces of the case main body rather than uniformly on all surfaces. This localized constraint allows the electrode body to expand freely in directions where no pinched portions exist, maintaining adaptability while providing necessary constraint.
Solution Approach 2:
Instead of fully constraining all side surfaces, the invention applies partial constraint only where necessary to prevent electrode movement. This partial action approach provides sufficient stabilization while leaving adequate space for electrode expansion and electrolyte distribution.
4Manufacturing precision
If the case main body is deformed to create abutting parts, then manufacturing precision is improved for electrode positioning, but the manufacturing process difficulty increases
Solution Approach 1:
The pinched portions are formed on the case main body in advance before electrode installation, ensuring precise positioning features are ready beforehand. This preliminary formation of constraint surfaces simplifies the overall manufacturing sequence while maintaining high positioning accuracy.
Solution Approach 2:
The side surfaces of the case main body undergo controlled local deformation through pinching, changing the geometric parameters of specific regions to create abutting surfaces. This parameter change approach achieves precise positioning features through relatively simple forming operations.
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 suppresses electrode movement, allows for expansion space, enhances battery performance, and facilitates easier manufacturing by creating gaps for electrolyte entry and gas escape.
Implementation Method 1
pressing at least one side surface of a case main body and deforming the pressed side surface to make the pressed side surface and a side surface opposed to the pressed side surface abut the electrode body
Data Source
AI summary
A square type battery includes a cover that is provided with a terminal and is formed in a substantially rectangle, a case main body that is formed in a substantially rectangular parallelopiped and that includes two pairs of opposed side surfaces connected to a peripheral edge part of the cover, and an electrode body that is accommodated inside the case main body and that is connected to the terminal. At least a first side surface among the two pairs of opposed side surfaces is pinched toward an inward of the case main body. The first side surface and a second side surface opposed to the first side surface abut the electrode body.