Cell Ageing Tray Layout for Sequential Parallel Battery Testing
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Solution Overview
Problem
Existing cell ageing methods for lithium-ion batteries are inefficient and inaccurate, particularly for low-potential cells like LFP systems, as they require long test times and low accuracy, leading to challenges in identifying unqualified products due to irreversible chemical self-discharge and limited metal impurity precipitation.
Innovation Solution
A cell charging and discharging tray and method that uses a high-potential cell to sequentially charge and age multiple low-potential cells, ensuring stable voltage and facilitating high-temperature and high-potential dechemical self-discharge, with a tray design featuring insulating and conductive components for safe and efficient parallel connection, and a method involving controlled temperature and voltage testing to determine cell quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cell ageing methods are used for low-potential cells, then the testing process is simple, but the test time is long and the test accuracy is low
Solution Approach 1:
The patent changes the voltage parameter by introducing a high-potential cell (type-A) to charge low-potential cells (type-B), thereby increasing the operating voltage and potential of the low-potential cells during ageing. This parameter change accelerates metal impurity precipitation and improves both test accuracy and reduces test time
Solution Approach 2:
The patent introduces a high-potential cell (type-A) as an intermediary charging source to charge multiple low-potential cells (type-B) simultaneously. This intermediary cell enables the low-potential cells to operate at higher voltages during ageing, improving the effectiveness of metal precipitation without requiring complex external charging equipment
2Manufacturing precision
If high-potential cells are used to charge low-potential cells, then dechemical self-discharge and metal precipitation are enhanced, but the complexity of the device increases
Solution Approach 1:
The high-potential cell (type-A) serves itself by charging the low-potential cells (type-B) during the ageing process. After completing its charging function, the type-A cell itself undergoes ageing testing. This self-service approach eliminates the need for separate charging equipment, maintaining device simplicity while achieving enhanced metal precipitation
Solution Approach 2:
The type-A cell performs multiple functions: it serves as a charging source for type-B cells, and simultaneously serves as a test subject for ageing evaluation. This multi-functionality reduces the need for additional dedicated equipment, thereby limiting the increase in device complexity
3Productivity
If sequential parallel connection is used to age multiple cells, then productivity is improved, but the reliability of connection may be compromised
Solution Approach 1:
The patent segments the connection system into separate conductive components for positive poles and negative poles, with each component independently connecting multiple cells in sequence. This segmentation allows parallel ageing of multiple cells while maintaining reliable connections through dedicated conductive paths for each polarity
Solution Approach 2:
Conductive components serve as intermediaries to establish reliable electrical connections between the type-A cell and multiple type-B cells. These intermediary conductive components ensure stable current flow during sequential parallel connection, maintaining connection reliability while enabling high productivity
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
This approach enhances manufacturing efficiency by extending the service life of high-potential cells, reduces cyclic ageing damage, and achieves effective dechemical self-discharge and metal precipitation, thereby improving the selection of qualified cells while reducing costs.
Implementation Method 1
cell self-discharge can be divided into physical self-discharge and chemical self-discharge according to different reaction types
Implementation Method 2
the dissolution and precipitation of metal foreign matter impurities
Implementation Method 3
a conductive component for realizing sequential parallel connection of the type-A cell and the type-B cells
Implementation Method 4
an insulating base component for accommodating the type-A cell and the type-B cells
Data Source
AI summary
The present application relates to a cell charging and discharging tray, a cell ageing device and a cell ageing method, wherein the tray includes an insulating base component for accommodating cells and a conductive component for realizing sequential parallel connection of a type-A cell and type-B cells, and is adapted for simultaneously ageing one type-A cell and a plurality of type-B cells, where a potential of the type-A cell is higher than that of each type-B cell. The tray provided by the present application adopts a design that the base component is separated from the conductive component, so that the ageing of a high-potential cell will be completed after low-potential cells are aged, and the service life of the high-potential cell is not affected, so shipment may be performed after self-discharge for selecting bad products is completed, which is conducive to improving the manufacturing efficiency.