Bipolar Battery Aging Charge Control for Shorter Manufacturing Time
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Solution Overview
Problem
The manufacturing process for bipolar batteries requires a longer high-temperature aging time due to the need to separately charge cells stacked in even numbers and odd numbers, which complicates the charging process and extends the aging time.
Innovation Solution
A method for manufacturing bipolar secondary batteries that involves an initial charging step, a high-temperature aging step, and an under-aging charging step. In the under-aging charging step, cells are alternately charged until they reach a specified voltage, with the charging completion condition determined based on the dissolution rate of metal foreign substances and the positive electrode potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cells are separately charged in even and odd groups during high-temperature aging, then charging completeness is improved, but aging time is extended
Solution Approach 1:
The patent performs preliminary charging of alternate cell groups (odd and even groups) before the high-temperature aging step. By pre-charging these groups to different voltage levels, the patent ensures that during aging, all cells will reach appropriate charge states without requiring extended aging time for separate charging operations, thus resolving the contradiction between charging completeness and aging time extension
Solution Approach 2:
The patent divides the cell groups into odd and even segments that are charged alternately and differently. This segmentation allows different charging strategies to be applied to different cell groups, optimizing the overall charging completeness during aging while managing the time required through systematic differentiation of charging approaches for each segment
2Device complexity
If charging completion is determined by lowest-voltage cell without considering dissolution rate, then process simplicity is maintained, but high-temperature aging time is extended
Solution Approach 1:
The patent implements a feedback mechanism where the charging completion determination incorporates the dissolution rate of foreign substances and positive electrode potential information. By using this feedback, the system can accurately determine when charging is complete based on actual electrochemical conditions rather than simple voltage thresholds, thereby reducing unnecessary aging time while maintaining process manageability through calculated completion criteria
Solution Approach 2:
The patent changes the determination parameter for charging completion from a simple voltage threshold to a more sophisticated criterion that includes dissolution rate and positive electrode potential. This parameter change enables more accurate timing of charging completion, reducing the high-temperature aging time required while ensuring proper charging of all cell groups
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 method shortens the high-temperature aging time by optimizing the charging process based on the dissolution rate and positive electrode potential, thereby improving manufacturing efficiency.
Implementation Method 1
a high-temperature aging step of performing aging at a high temperature higher than room temperature, and an under-aging charging step of alternately charging the first cell group and the second cell group in the high-temperature aging step
Data Source
AI summary
A method for manufacturing a bipolar secondary battery includes an initial charging step of charging, to a specified voltage, a first cell group including multiple cells arranged at every other tier in a stacking direction, and a second cell group including multiple cells arranged next to the respective cells included in the first cell group, a high-temperature aging step of performing aging at a higher temperature than room temperature, and an under-aging charging step of alternately charging the first and second cell groups until the first and second cell groups reach the specified voltage. In the under-aging charging step, a charging completion condition for at least one of the first and second cell groups is determined based on a dissolution rate calculated based on a metal foreign substance type and a positive electrode potential, and a voltage and an aging time of each cell in the under-aging charging step.