Battery Current Collection Terminal With Porous Resin-Sealed Interface
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Solution Overview
Problem
Existing batteries face issues with moisture ingress through resin layers in the laminate film, compromising adhesion and integrity, particularly in the junction between the current collection terminal and the laminate exterior material.
Innovation Solution
A battery design incorporating a current collection terminal with a porous portion filled with a resin layer, where the terminal includes a base portion and a porous portion, and a laminate film with a metal and inner resin layer, enhancing adhesion and reducing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a tab film (resin layer) is disposed between the current collection terminal and the laminate film to improve adhesion, then adhesion between the current collection terminal and the laminate film increases, but moisture easily enters the internal region sealed by the laminate film through the resin layer
Solution Approach 1:
The current collection terminal includes a porous portion that allows the resin layer to fill its interior, creating a mechanically interlocked structure. This porous configuration enables the resin layer to penetrate and anchor within the terminal structure, significantly enhancing adhesion strength while maintaining moisture barrier integrity through the filled porous structure.
Solution Approach 2:
The invention creates a composite structure where the resin layer and the porous current collection terminal (containing alumite layer) are combined. The resin layer fills the porous portion to form an integrated composite structure that simultaneously provides strong adhesion and effective moisture resistance, resolving the contradiction between these two properties.
2Ease of manufacture
If the current collection terminal has a smooth surface for easy manufacturing, then manufacturing is simpler, but adhesion to the laminate film is insufficient
Solution Approach 1:
The current collection terminal is designed with a porous portion that can be formed through anodization treatment of aluminum. This porous structure is created during the manufacturing process itself, adding adhesion-enhancing features without requiring separate complex manufacturing steps. The porous structure forms naturally through electrochemical oxidation, maintaining manufacturing simplicity while dramatically improving adhesion.
Solution Approach 2:
The porous portion is formed in advance on the current collection terminal before the resin layer is applied. This preliminary creation of the porous structure allows the resin layer to subsequently fill and anchor into the pores, ensuring strong adhesion is built into the structure during the manufacturing sequence rather than requiring post-processing modifications.
3Strength
If an alumite layer is applied to the current collection terminal to improve adhesion, then adhesion increases, but the surface becomes rough and moisture resistance decreases
Solution Approach 1:
The alumite layer is specifically configured as a porous portion rather than a solid coating. This porous structure has a controlled pore size and distribution that allows resin layer penetration for adhesion while the resin filling of these pores creates a sealed structure that prevents moisture ingress. The porous alumite thus provides both adhesion enhancement and moisture resistance when combined with the resin layer.
Solution Approach 2:
The resin layer acts as an intermediary substance that fills the porous alumite layer. This resin mediator simultaneously achieves two functions: it mechanically interlocks with the alumite structure to provide strong adhesion, and it seals the porous structure to prevent moisture penetration, thus resolving the contradiction between adhesion enhancement and moisture resistance.
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 restricts moisture entry while maintaining strong adhesion between the current collection terminal and the laminate film, thereby improving the battery's overall integrity and performance.
Implementation Method 1
at least a part of the resin layer fills the interior of the porous portion
Implementation Method 2
the current collection terminal contains aluminum; and the porous portion is an alumite portion
Data Source
AI summary
The present disclosure solves the problem by providing a battery including: an electrode body; a current collection terminal disposed at a side surface portion of the electrode body; and a laminate film covering the electrode body and the current collection terminal, in which: the electrode body includes a current collection tab; the current collection tab and the current collection terminal are electrically connected; the laminate film includes a metal layer and an inner resin layer closer to the current collection terminal than the metal layer is; the current collection terminal includes a base portion and a porous portion closer to the laminate film than the base portion is; a resin layer including the inner resin layer is disposed between the base portion and the metal layer; the porous portion and the resin layer contact; and at least a part of the resin layer fills the interior of the porous portion.