Secondary Battery Lead Structure for Vibration and Shock Durability
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Solution Overview
Problem
Secondary batteries lack sufficient physical durability, which is a critical issue as they are prone to damage from external forces such as vibration and shock, leading to potential defects like cracking or breakage of the positive electrode lead and internal short circuits.
Innovation Solution
The design incorporates a positive electrode lead with a curved turning part that allows it to be securely coupled, reducing stress concentrations and enhancing durability by being sandwiched between the cover part and the battery device, while also using insulating films and sealants to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positive electrode lead is made rigid for stable electrical coupling, then electrical connectivity is improved, but susceptibility to cracking and breakage under external forces increases
Solution Approach 1:
The positive electrode lead includes a turning part with a curved shape that allows the lead to flex and absorb external forces such as vibration and shock. This curvature enables the lead to bend without breaking, maintaining both electrical connectivity and mechanical strength under external forces.
Solution Approach 2:
The positive electrode lead is designed with a flexible turning part that can dynamically adjust its shape in response to external forces. Rather than being completely rigid, the lead can bend and deform elastically to absorb stress, preventing cracking while maintaining electrical coupling.
2Strength
If the positive electrode lead is made flexible to resist cracking, then durability under external forces is improved, but electrical coupling stability may deteriorate
Solution Approach 1:
The curved turning part provides flexibility to resist cracking while the overall lead structure maintains stable electrical coupling. The curvature is designed to flex under external forces without compromising the electrical connection between electrodes.
Solution Approach 2:
The positive electrode lead is divided into different sections with varying flexibility - the turning part is designed to be flexible to absorb stress, while other portions maintain rigidity for stable electrical coupling. This segmentation allows different parts to fulfill different functional requirements.
3Volume of moving object
If the coupling wiring line is positioned close to the battery device for compact design, then device size is reduced, but susceptibility to damage from external forces increases
Solution Approach 1:
The curved turning part of the coupling wiring line allows it to fit within the compact battery device while maintaining the ability to flex and absorb external forces. The curvature enables the wiring to bend without breaking even in the constrained space of a compact design.
Solution Approach 2:
The coupling wiring line incorporates a dynamic turning part that can flex in response to external forces, allowing the compact battery device to withstand vibration and shock without damaging the internal wiring.
Data Source
AI summary
A secondary battery includes an outer package member, a battery device, an external terminal, and a coupling wiring line. The battery device is placed in the outer package member and includes a first electrode and a second electrode. The external terminal is attached to the outer package member and electrically insulated from the outer package member. The coupling wiring line is electrically insulated from the outer package member and electrically coupled to each of the first electrode and the external terminal. The coupling wiring line includes a first part, a second part that overlaps with the first part, and a turning part that is curved to allow the first part and the second part to be coupled to each other.