Secondary Battery Fuse Insulation Against Electric Arcs
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Solution Overview
Problem
Existing secondary batteries with fuses outside the exterior body face reliability issues due to potential damage from electric arcs and deformation during short circuits, and existing designs may not adequately protect components from such events.
Innovation Solution
A secondary battery design featuring a fuse integrated into the positive-electrode conductive member, covered by an insulating resin, and an insulating member between the conductive member and the sealing body, which prevents electric arcs from damaging external components and reduces the risk of fuse deformation during welding or impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuse is disposed outside the exterior body to block current path during short circuit, then the battery can prevent excessive current flow, but the fuse may be damaged by electric arcs and deformation during short circuits
Solution Approach 1:
The patent introduces an insulating member as an intermediary between the fuse and the exterior body. This insulating member acts as a mediator that protects the fuse from electric arcs and harmful factors during short circuits, while still allowing the fuse to perform its current blocking function. The insulating member is positioned between the fuse and the exterior body opening, creating a protective barrier.
Solution Approach 2:
The patent applies preliminary anti-action by pre-positioning the insulating member to counteract the harmful effects of electric arcs before they can damage the fuse. The insulating member is installed in advance to prevent electric arc damage, rather than attempting to protect the fuse after damage occurs. This proactive approach ensures the fuse remains intact and functional during short circuit events.
2Reliability
If the fuse is placed outside the exterior body for current protection, then the battery can block excessive current, but the fuse may deform during welding or impact
Solution Approach 1:
The insulating member serves as a protective intermediary that shields the fuse from external mechanical impacts and welding heat. By positioning the insulating member between the fuse and the exterior body, the fuse is protected from deformation during welding operations and impact events, maintaining its structural integrity while preserving its current blocking capability.
Solution Approach 2:
The patent implements beforehand cushioning by pre-installing the insulating member to cushion the fuse against potential mechanical damage. The insulating member is positioned in advance to absorb and distribute mechanical stresses from impacts and thermal stresses from welding, preventing fuse deformation before it can occur.
3Object-affected harmful factors
If the fuse is covered by insulating material to protect from electric arcs, then component damage is prevented, but the device complexity increases
Solution Approach 1:
The insulating member is designed to serve multiple functions simultaneously: it provides electric arc protection to the fuse, acts as a mechanical support structure, and serves as an integral part of the sealing body assembly. By making the insulating member multi-functional, the patent reduces the need for additional separate protective components, thereby minimizing the increase in device complexity while maintaining comprehensive protection.
Solution Approach 2:
The patent merges the insulating member with the sealing body structure, combining the protective insulating function with the existing sealing and structural components. This integration approach eliminates the need for separate protective housings or additional complex assembly steps, achieving electric arc protection with minimal increase in overall device complexity.
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
The design enhances the reliability of secondary batteries by preventing component damage from electric arcs and ensuring the fuse remains intact during short circuits, maintaining the battery's structural integrity and functionality.
Implementation Method 1
When a short circuit occurs in the secondary battery and an excessive short-circuit current flows through the secondary battery, the fuse 106 melts due to Joule heat, blocking the current path.
Data Source
AI summary
A secondary battery includes an electrode body including a positive-electrode sheet and a negative-electrode sheet, an exterior body having an opening and accommodating the electrode body, a sealing body sealing the opening, a terminal electrically connected to the positive-electrode sheet and extending through a through-hole formed in the sealing body, and a conductive member connected to the terminal outside the sealing body. The conductive member includes a fuse. The fuse is covered by a cover. An insulating member is disposed between the conductive member including the fuse and the sealing body.