Secondary Battery Electrode Plate Layout for Higher Energy Density
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Solution Overview
Problem
Existing secondary battery designs face challenges in reducing the space occupied by the conductive structure, which affects the energy density due to the separation of current collectors and the need for additional metal sheets to improve current passing capacity.
Innovation Solution
The electrode plate features a current collector with an insulating layer and two conductive layers, where the conductive members are arranged to form electric guiding sections and current collecting sections, allowing for reduced thickness and improved current collection without the need for additional metal sheets, thereby minimizing space and enhancing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional metal sheets are arranged to connect to the sandwich structure to allow current channel, then current passing capacity is improved, but the space occupied by conductive structure increases
Solution Approach 1:
The patent merges the functions of current collection and current conduction by integrating conductive layers directly onto the current collector surfaces. The first and second conductive layers are formed on the first and second surfaces of the current collector respectively, eliminating the need for separate additional metal sheets to establish current channels.
Solution Approach 2:
The current collector is designed to serve multiple functions simultaneously: it acts as both the structural support and the current collection/conduction pathway. The conductive layers on both surfaces of the current collector enable it to collect current from electrode materials and conduct it to external terminals without requiring separate dedicated conduction components.
2Reliability
If current collector is designed with sandwich structure and additional metal sheets, then current collection is improved, but energy density decreases due to increased space occupation
Solution Approach 1:
The patent combines the current collection function with the current collector structure itself by forming conductive layers directly on its surfaces. This integration eliminates the need for additional separate metal sheets, thereby reducing the volume occupied by conductive structures and increasing the proportion of active materials in the battery.
Solution Approach 2:
The patent optimizes the thickness and conductivity parameters of the conductive layers formed on the current collector. By controlling these parameters, the design achieves sufficient current collection capability while minimizing the space occupied by non-active components, thus improving energy density.
Data Source
AI summary
A secondary battery includes an electrode assembly including current collecting sections, an electrode terminal, and an adapter sheet connecting the current collecting sections to the electrode terminal. The electrode assembly includes active material layer(s), current collector(s) each including an insulating layer and first and second conductive layers sandwiching the insulating layer, and conductive structures each including first and second conductive members. A portion of the first conductive member extending beyond the second conductive member forms a current collecting section. The current collecting sections are laminated with each other, with one of the current collecting sections directly contacting the adapter sheet. Neighboring ones of the current collecting sections directly contact each other, without any second conductive member arranged therebetween.