Crosslinked Insulating Adhesive Layer for Battery Electrode Edges
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Solution Overview
Problem
Secondary ion batteries face issues such as short-circuiting due to metal particle punctures in the separator and tab bending, leading to safety risks during assembly and encasement, which conventional insulating adhesive layers fail to adequately address.
Innovation Solution
An insulating adhesive layer composed of a three-dimensional crosslinked network formed by structural units A, B, and D, including acrylonitrile and acrylate monomers, enhances wear resistance and flexibility, preventing direct laser cutting and metal particle splashes, and isolating tab and electrode plate contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulating adhesive layer is used at the edge of the positive electrode plate, then it provides basic insulation, but it has poor wear resistance and cannot effectively prevent tab root contact with the electrode plate during encasement
Solution Approach 1:
The patent uses a composite adhesive composition containing acrylic resin as the main component, along with specific additives and fillers. This composite material provides both insulation properties and enhanced wear resistance, resolving the contradiction between reliability and strength.
Solution Approach 2:
The patent modifies the adhesive properties by changing parameters such as adding specific fillers (alumina, silica), adjusting the adhesive composition ratios, and controlling the thickness of the adhesive layer (5-20 μm). These parameter changes enhance wear resistance while maintaining insulation reliability.
2Ease of manufacture
If the current collector is directly subjected to laser cutting, then the manufacturing process is simple, but metal particles splash onto the separator causing punctures and short circuits
Solution Approach 1:
The insulating adhesive layer acts as an intermediary between the laser cutting process and the separator. It protects the separator from metal particle splashes while allowing the laser cutting process to proceed on the current collector, thus resolving the contradiction between ease of manufacture and harmful factors.
Solution Approach 2:
The adhesive layer is applied beforehand to the current collector before laser cutting. This prior cushioning prevents metal particles from reaching and puncturing the separator during the laser cutting process, eliminating the harmful effect while maintaining the simple manufacturing process.
3Adaptability or versatility
If the tab bends during encasement, then it flexes to accommodate positioning, but the tab root contacts the blank edge of the positive electrode plate causing short circuits
Solution Approach 1:
The patent applies a thin film insulating adhesive layer (5-20 μm) over the positive electrode plate edge. This flexible thin film accommodates tab bending movements while maintaining electrical insulation, thus resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The insulating adhesive layer serves as an intermediary barrier between the tab root and the positive electrode plate blank edge. It allows tab flexibility for positioning while preventing direct contact that would cause short circuits, resolving the contradiction between adaptability and reliability.
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 adhesive layer effectively prevents short circuits and metal particle punctures, ensuring safer battery operation by enhancing wear resistance and protecting the separator from laser cutting debris.
Implementation Method 1
where at least a part of the structural unit A is crosslinked with at least a part of the structural unit D through hydrogen bond interactions
Implementation Method 2
the formed insulating adhesive layer can prevent the current collector of the positive electrode plate from being directly subjected to laser cutting, effectively resisting the splashing of metal particles
Implementation Method 3
the structural unit B is provided by an acrylonitrile monomer, where the monomer is a hard monomer that can enhance the strength of an insulating adhesive layer
Implementation Method 4
the structural unit C is provided by acrylate monomer, where the acrylate is a soft monomer that can improve the flexibility of the insulating adhesive layer and can also enhance the adhesive force of the insulating adhesive layer to a current collector
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
This application provides an adhesion substance, an adhesive composition, a positive electrode plate, a secondary battery, and an electric apparatus. The adhesion substance includes an adhesive, the adhesive including structural unit A, structural unit B, structural unit C, and structural unit D, at least a portion of the structural unit A being crosslinked with at least a portion of the structural unit D; where the structural unit A is formula (1); the structural unit B is independently selected from any one or more of formula (2), formula (3), formula (4), formula (6), or formula (6), optionally, the structural unit B is formula (1) or formula (2); the structural unit C is independently selected from any one of formula (7) or formula (8), m1 and m2 being each independently an integer from 1 to 20, optionally, each m1 being independently an integer from 2 to 12, and each m2 being independently an integer from 8 to 12; and the structural unit D is independently selected from any one or more of formula (9), each n1 being independently an integer from 1 to 20, optionally, n1 being an integer from 1 to 12, further optionally n1 being an integer from 1 to 6.