Planar Pouch Cell Lug Layout for Safer Pack Connection
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Solution Overview
Problem
Pouch cells in mass production processes are difficult to handle due to close proximity of contact lugs, leading to potential short-circuiting and high technical and financial costs for automated electrical connections, and conventional cylindrical lithium-ion cells in battery packs for handheld power tools experience power losses, requiring early shutdown due to temperature-related issues.
Innovation Solution
Design of pouch cells with upper and lower connecting elements on positive and negative contact lugs, allowing for easy and reliable electrical contact through plug-in, pressing, or heating methods, reducing power losses and enabling longer operation or higher power usage by replacing conventional cells with pouch cells in battery packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If contact lugs are positioned close together to reduce device size, then the pouch cell becomes more compact, but the risk of short-circuiting increases and handling becomes more difficult
Solution Approach 1:
The patent transitions from a conventional single-sided contact lug arrangement to a three-dimensional configuration where contact lugs are distributed on opposite sides of the pouch cell. This spatial redistribution in multiple dimensions allows compact overall cell size while maintaining safe distances between positive and negative contacts, thereby reducing short-circuit risk.
2Device complexity
If conventional cylindrical lithium-ion cells are used in battery packs, then the battery pack structure is simple, but power losses are high and temperature-related shutdowns occur
Solution Approach 1:
The patent changes the fundamental geometric parameters of the battery cells from cylindrical to planar/pouch configuration. This parameter change results in lower internal resistance and reduced power losses during discharge, while also improving thermal management characteristics to prevent temperature-related shutdowns.
3Manufacturing precision
If automated electrical connection systems are developed to handle pouch cells with close contact lugs, then connection precision improves, but technical and financial expenditure increases
Solution Approach 1:
The patent incorporates connecting elements directly into the contact lugs during the cell manufacturing process, before the cells are assembled into battery packs. This preliminary integration simplifies subsequent assembly operations and reduces the complexity and cost of automated connection systems required in production.
Data Source
AI summary
Pouch cell having a positive contact lug and a negative contact lug, in which contact lugs electrical contact can be made with the pouch cell pouch cell and the pouch cell can be charged and discharged in this way, wherein the pouch cell is of planar design and has a flat cell surface which extends parallel in relation to the positive contact lug and the negative contact lug, wherein the positive contact lug has an upper positive connecting element and a lower positive connecting element, which positive connecting elements are arranged on opposite sides of the positive contact lug, and the negative contact lug has an upper negative connecting element and a lower negative connecting element, which negative connecting elements are arranged on opposite sides of the negative contact lug.