Battery Insulating Member Layout for Adhesion and Short-Circuit Heat Control
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Solution Overview
Problem
Existing insulating members in secondary batteries face issues with reduced adhesion strength when mixed with adhesive agents and insulating inorganic materials, leading to potential peeling off and increased heat generation during internal short-circuiting due to conductive foreign objects.
Innovation Solution
A secondary battery design featuring a positive electrode with a heat resistive portion containing insulating inorganic material and an adhesive portion covering the base member, positioned to oppose the positive electrode lead, enhancing adhesion and suppressing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an adhesive agent and insulating inorganic material are mixed to form an insulating member, then heat generation is suppressed during internal short-circuiting, but the adhesion strength of the adhesive layer is reduced and the layer may peel off
Solution Approach 1:
The insulating member is divided into three distinct functional layers: a base member portion, a heat resistive portion containing insulating inorganic material positioned to oppose the positive electrode lead, and an adhesive portion covering the other surfaces. This segmentation allows the heat resistive portion to suppress heat generation while the adhesive portion maintains strong adhesion without mixing the adhesive agent with insulating inorganic material.
Solution Approach 2:
Different portions of the insulating member have different compositions and functions: the heat resistive portion contains insulating inorganic material for heat suppression, the adhesive portion contains adhesive agent for strong bonding, and the base member portion provides structural support. This local differentiation of material properties resolves the contradiction by providing each function in the appropriate location rather than mixing all materials throughout.
2Reliability
If the adhesive layer contains mixed adhesive agent and insulating inorganic material, then insulating performance is improved, but the adhesive layer peels off from the positive electrode
Solution Approach 1:
The insulating member is segmented into distinct layers where the adhesive portion is separated from the heat resistive portion. This allows the adhesive portion to maintain pure adhesive properties for strong bonding and layer integrity, while the heat resistive portion provides insulating performance without compromising adhesive strength.
Solution Approach 2:
The adhesive portion is formulated with adhesive agent without insulating inorganic material to maximize adhesion strength and prevent peeling, while the heat resistive portion contains the insulating inorganic material for electrical insulation. This local quality differentiation ensures both adhesive integrity and insulating performance are achieved in their respective locations.
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 prevents peeling off of the insulating member and reduces heat generation during internal short-circuiting by using a heat resistive portion with insulating inorganic material to act as a high-resistance element, thereby maintaining battery safety.
Implementation Method 1
an adhesive portion which covers at least a part of each of surfaces of the base member portion and the heat resistive portion
Implementation Method 2
a heat resistive portion formed over a part of one surface of the base member portion and containing an insulating inorganic material... the heat resistive portion opposes an outer surface of the one-end portion
Data Source
AI summary
This secondary battery is characterized by being provided with: a positive electrode; and a positive electrode lead that is connected to the positive electrode, wherein the positive electrode has a positive electrode collector and a positive electrode active material layer formed in at least one surface of the positive electrode collector, at least one of the surfaces of the positive electrode has a laminated part in which the positive electrode active material layer is formed, and an exposed part in which the positive electrode collector is exposed, and the positive electrode lead has an one-end part connected to the exposed part and an extended part which extends from the one-end part to the outside of the positive electrode. The secondary battery is further provided with an insulating member that has a base material part, a heat resistant and an adhesive part.