Secondary Battery Heat-Resistant Insulation for Welded Sealing
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving both high battery capacity and safety by effectively suppressing short circuits, particularly in high-temperature environments.
Innovation Solution
A secondary battery design incorporating a heat-resistant member with insulating properties is disposed between the outer package member and the battery device, covering from the opposed surface to the side surface, thereby preventing short circuits while maintaining battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closing member is welded to the container member to seal the battery, then the battery structure is completed and sealed, but heat generated during welding may damage the separator and cause short circuits
Solution Approach 1:
A heat-resistant member with insulating properties is introduced as an intermediary between the battery device and the closing member. This mediator protects the separator from heat generated during welding of the closing member to the container member, preventing short circuits while maintaining sealing reliability.
Solution Approach 2:
The heat-resistant member is disposed in advance between the outer package and the battery device before the welding process. This preliminary placement ensures that when welding occurs, the protective insulation is already in position to prevent heat damage to the separator.
2Reliability
If insulating tape is applied to electrodes to prevent short circuits in high temperature environments, then short circuit prevention is improved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The heat-resistant member combines multiple functions into a single component: it provides thermal insulation during welding, maintains insulating properties in high-temperature environments, and structurally positions the battery device within the outer package. This eliminates the need for separate insulating tapes on electrodes.
Solution Approach 2:
The heat-resistant member serves multiple purposes simultaneously: protecting against welding heat, preventing short circuits in high-temperature operation, and providing structural support. This multi-functional design simplifies the overall battery structure compared to using multiple specialized components.
3Quantity of substance
If the heat-resistant member covers only part of the battery device, then material usage is reduced, but insufficient coverage may leave areas vulnerable to short circuits
Solution Approach 1:
The heat-resistant member is strategically positioned to cover specific critical areas of the battery device where short circuit risks are highest, such as areas near the closing member welding zone and electrode interfaces. This targeted coverage optimizes the balance between material usage and protective effectiveness.
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 effectively suppresses short circuits and maintains battery capacity by using a heat-resistant member to insulate the battery device, enhancing safety and energy density.
Implementation Method 1
the heat-resistant member has an insulating property and is disposed between the outer package member and the battery device
Implementation Method 2
the closing member closes the opening, and is welded to the container member
Data Source
AI summary
A secondary battery includes an outer package member, a battery device, and a heat-resistant member. The battery device is contained inside the outer package member. The heat-resistant member has an insulating property and is disposed between the outer package member and the battery device. The outer package member includes a container member and a closing member. The container member has an opening, and contains the battery device inside. The closing member closes the opening, and is welded to the container member. The battery device has an opposed surface and a side surface. The opposed surface is opposed to the closing member. The side surface is coupled to the opposed surface. The heat-resistant member covers from the opposed surface to the side surface.