Cylinder Battery Insulating Plate Center Pin Separation Prevention
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Solution Overview
Problem
The existing cylinder type lithium ion secondary batteries face challenges in electrolyte impregnation and center pin separation due to the upper insulating plate's design, which prevents the center pin from being inserted after electrolyte injection, leading to reduced impregnation efficiency and potential safety issues during external shocks.
Innovation Solution
A center pin separation prevention unit is integrated into the upper insulating plate, allowing the center pin to be inserted after electrolyte injection, with a deforming portion that bends towards the electrode assembly and a rotation portion to secure the pin in place, ensuring effective electrolyte impregnation and preventing pin dislodgment during shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper insulating plate has a fixed hollow structure, then the center pin is prevented from separating toward the cap assembly during external shocks, but the center pin cannot be inserted after electrolyte injection, reducing electrolyte impregnation efficiency
Solution Approach 1:
The hollow structure of the upper insulating plate is designed with a deformable portion that can dynamically change its shape. During electrolyte injection, the hollow is in a first shape that allows center pin insertion. During external shocks, the deformable portion elastically deforms to a second shape that prevents center pin separation toward the cap assembly, while maintaining insulation functionality.
Solution Approach 2:
The shape parameter of the hollow structure is changed based on operating conditions. The deformable portion allows the hollow to transition between a first shape (during normal operation and electrolyte injection) that permits center pin insertion, and a second shape (during external shocks) that prevents center pin separation, thus adapting to different operational states.
2Reliability
If the center pin is inserted before electrolyte injection, then the center pin is secured in place, but the electrolyte impregnation rate is reduced
Solution Approach 1:
The upper insulating plate with the deformable hollow is prepared in advance to allow easy center pin insertion during electrolyte injection. The center pin is inserted into the electrode assembly after electrolyte injection begins, taking advantage of the pre-prepared hollow structure that guides and secures the pin while maintaining high electrolyte impregnation efficiency.
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 enhances electrolyte impregnation, maintains battery integrity during external shocks, and prevents safety vent damage by allowing the center pin to be securely inserted after electrolyte injection, improving overall battery performance and safety.
Implementation Method 1
a deforming portion connected to the hollow and bendable toward the electrode assembly when the center pin is inserted
Implementation Method 2
a rotation portion connected to an end of the deforming portion and to rotate toward the electrode assembly about the deforming portion by a predetermined angle when the center pin is inserted
Data Source
AI summary
A cylinder type lithium ion secondary battery has a center pin that is inserted into an electrode assembly after the injection of electrolyte to increase impregnation of the electrolyte. The battery includes an electrode assembly, a case to accommodate the electrode assembly, a center pin inserted into the center of the electrode assembly, a cap assembly to seal an upper end opening of the electrode assembly, and an upper insulating plate disposed between the electrode assembly and the cap assembly. The upper insulating plate has a hollow formed in the center through which the center pin can penetrate, and the hollow has a center pin separation preventing unit bendable only toward the electrode assembly when the center pin penetrates through the hollow.