Segmented Current Collector for High-Density Secondary Batteries
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Solution Overview
Problem
Secondary batteries used in small devices face limitations in increasing energy density due to reduced volumes, leading to shorter lifespans as they are charged and discharged more frequently.
Innovation Solution
A current collector with a specific structure, including grooves to accommodate fixing members and provide elasticity, is used in a secondary battery design, enhancing contact area and optimizing electrode structure to increase energy density and battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the volume of secondary batteries is decreased to fit small devices, then the battery size is reduced, but the energy density increases are limited and battery lifespan is shortened
Solution Approach 1:
The current collector is divided into multiple plates (first conductive plate, second conductive plate, third conductive plate) connected in sequence, creating a segmented structure that accommodates fixing members and provides elasticity. This segmentation allows the battery to maintain structural integrity and electrical connectivity while adapting to volume constraints, thereby preserving battery lifespan in small devices.
2Volume of moving object
If the battery volume is reduced for small devices, then the device size is decreased, but the contact area of current collectors is reduced
Solution Approach 1:
The current collector structure extends in the vertical dimension with multiple stacked conductive plates connected in sequence. This multi-layer arrangement increases the total contact area with electrode stacks without increasing the horizontal footprint, effectively solving the contradiction between reduced battery volume and maintained contact area in small devices.
3Volume of moving object
If the battery volume is decreased, then the device size is reduced, but the energy density cannot be increased
Solution Approach 1:
The current collector structure incorporates elastic components through grooves and flexible plate arrangements that can deform and adapt to the compact battery geometry. This flexibility allows maximization of active material packing density while maintaining electrical connectivity, thereby increasing energy density within the reduced volume constraints of small devices.
Data Source
AI summary
A current collector, a secondary battery including the same, and an electronic apparatus including the battery. The current collector includes a first conductive plate including first and second grooves, wherein the first and second grooves are configured to accommodate a fixing member, and wherein the first and second grooves are symmetrical to each other.