Terminal Plate Step Structure for Battery Contact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As electrical storage devices are miniaturized, the reduced size of terminal plates and bus bars increases contact resistance, leading to decreased holding power and potential disconnection of terminal plates from electrode assemblies due to tilting of holders when torque pressure is applied.
Innovation Solution
The electrical storage device features a terminal plate with a larger first plane and a step or slope on its side surface, surrounded by an insulating holder, which increases the contact area with the bus bar and maintains holding power, preventing tilting and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the terminal plate is reduced to miniaturize the electrical storage device, then the device size is reduced, but the contact area between the terminal plate and bus bar decreases, causing contact resistance to increase
Solution Approach 1:
The terminal plate is designed with a step structure that creates different surface levels: a first surface that contacts the bus bar and a second surface that contacts the holder. This local differentiation allows the contact area with the bus bar to be sufficiently large for low contact resistance, while the overall plate size remains compact.
2Volume of moving object
If the holder size is reduced to accommodate miniaturization, then the device size is reduced, but the holding power of the holder decreases, causing the terminal plate to tilt when torque is applied
Solution Approach 1:
The holder is designed with a recess that specifically receives the second surface of the terminal plate. This localized fitting structure provides sufficient holding power to prevent tilting under torque, while the overall holder dimensions remain compact to accommodate device miniaturization.
3Reliability
If the contact area between terminal plate and bus bar is increased to reduce contact resistance, then contact resistance decreases, but the holder size must be increased, causing the device size to increase
Solution Approach 1:
The terminal plate surface is segmented into two distinct levels: the first surface for bus bar contact and the second surface for holder contact. This segmentation allows the bus bar contact area to be optimized for low resistance independently of the holder dimensions, enabling compact device design without compromising electrical connection quality.
4Strength
If the holder is made larger to prevent tilting under torque, then holding power increases, but the device complexity and size increase
Solution Approach 1:
Rather than uniformly increasing holder size, the design uses a localized recess structure that fits precisely with the second surface of the terminal plate. This targeted approach provides sufficient anti-tilting strength without unnecessarily increasing overall holder dimensions or structural complexity.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An electrical storage device (100) includes a casing (10) that has an opening (12), an electrode assembly (20) that is placed inside the casing (10), a terminal plate (40) that is electrically connected to the electrode assembly (20), and a holder (50) that is provided to surround the terminal plate (40), the terminal plate (40) having a step or a slope in an area in which the terminal plate (40) comes in contact with the holder (50).