Battery Terminal Pushing Force for Vibration Resistance
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Solution Overview
Problem
Lithium-ion secondary batteries face reliability issues in the joining portion between the terminal and the electrode body due to repeated vibrations, which can lead to disconnection and reduced performance during vehicle use.
Innovation Solution
The battery design includes a terminal with a base end attached to a sealing plate, an intermediate part extending along the battery outer case, and a tip end that is joined to the electrode body, applying a force to push the electrode body against the case, enhancing the contact and reliability of the joining portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal is joined to the electrode body by resistance welding, then the joining portion can be formed, but the joining portion becomes unreliable under repeated vibrations
Solution Approach 1:
The terminal tip end is designed to apply a preliminary pushing force to the electrode body in advance, creating pre-compression at the joining portion. This preliminary anti-action counteracts the harmful effects of subsequent vibrations before they occur, preventing disconnection by maintaining continuous contact pressure between the terminal and electrode body during vibrational cycles
Solution Approach 2:
The terminal tip end is bent into a curved shape rather than remaining straight. This curvature allows the tip end to effectively push the electrode body toward the case main body, distributing the pushing force more effectively and ensuring reliable contact at the joining portion even when subjected to multi-directional vibrations from vehicle operation
2Reliability
If the tip end of the terminal is bent to push the electrode body, then close contact is maintained under vibration, but the terminal structure becomes more complex
Solution Approach 1:
The terminal is designed to perform multiple functions: it serves as both the electrical connection conductor and the pushing mechanism that applies compression to the electrode body. The tip end's bent shape enables it to fulfill both the electrical conduction function and the mechanical pushing function simultaneously, eliminating the need for separate components and thereby reducing overall device complexity while improving reliability
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 configuration ensures that the tip end of the terminal maintains close contact with the electrode body even under vibration, preventing disconnection and enhancing the reliability of the joining portion between the terminal and the electrode body.
Implementation Method 1
the tip end is joined to a surface on one side of the part to which the terminal is joined, and pushes the part to which the terminal is joined. In this case, a force acts in a direction where the tip end of the terminal makes close contact with an intermediate part of the electrode body.
Data Source
AI summary
A battery includes: a battery outer case; an electrode body; and a terminal. The case main body includes a bottomed case main body which has a flat accommodation space and of which one surface is opened, and a sealing plate attached to that one surface of the case main body which is opened. The electrode body is a flat electrode body, is accommodated in the flat accommodation space of the case main body, and has a part to which the terminal is joined. The terminal includes a base end attached to the sealing plate, an intermediate part extending from the base end toward the part to which the terminal is joined, along a surface on one side of the battery outer case, and a tip end joined to the part to which the terminal is joined. The tip end of the terminal is joined to a surface on one side of the part to which the terminal is joined, and pushes the part to which the terminal is joined.