Battery Unit Screening by Overpotential for Storage Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery manufacturing processes result in inconsistent battery groups due to differences in manufacturing processes, leading to poor consistency between batteries, which worsens during storage before use.
Innovation Solution
A battery device comprising battery units with a relative difference in characteristic values within a preset range, determined by discharging at a specific rate and analyzing the overpotential variation curve to select units with consistent polarization characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single batteries are grouped directly after manufacturing based on voltage, internal resistance, and capacity, then the grouping process is simple and fast, but the consistency between batteries deteriorates during storage
Solution Approach 1:
The patent applies preliminary action by performing accelerated aging treatment on battery units before grouping to predict their future performance characteristics. This advance treatment allows the selection of battery units that will maintain good consistency during actual storage, rather than relying on initial measurements that do not account for storage degradation. The accelerated aging process simulates long-term storage effects in a condensed timeframe, enabling proactive selection of compatible battery units.
2Device complexity
If traditional screening methods using voltage, internal resistance, and capacity are used, then the screening process is simple, but the consistency between batteries worsens after storage
Solution Approach 1:
The patent changes the screening parameters from traditional voltage, internal resistance, and capacity measurements to polarization resistance and open-circuit voltage characteristics obtained through accelerated aging treatment. These new parameters better reflect the battery units' behavior during storage and provide more accurate predictions of future consistency. The parameter change enables more effective screening while maintaining a manageable process complexity through standardized testing procedures.
3Reliability
If accelerated aging treatment and polarization resistance testing are implemented, then the consistency between batteries is improved after storage, but the detection complexity increases
Solution Approach 1:
The patent implements feedback mechanisms through automated detection systems that measure polarization resistance and open-circuit voltage, then use this data to automatically screen and select battery units for grouping. The system provides real-time feedback on battery unit characteristics and compares them against predefined criteria, enabling automated decision-making. This feedback loop reduces the need for manual analysis and simplifies the overall detection process despite the increased measurement complexity.
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
Ensures better consistency and performance of battery groups after storage, with online monitoring capabilities to maintain consistency during use.
Implementation Method 1
During the storage process, a series of electrochemical changes spontaneously occur inside the single batteries
Implementation Method 2
a variation curve between the differential result of overpotential and time and time is obtained
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention discloses a battery device, a detection method thereof, and a screening method and device of a battery unit. A difference between characteristic values of any two battery units in the target charge state within a first preset range is controlled. Through the difference in overpotential of different battery units, the polarization difference between different battery units is reflected, thus reflecting the consistency difference between different battery units. The solution may dynamically monitor the consistency of various battery units, which may reflect the consistency of the battery unit during use, realize the online monitoring of the battery unit, and provide guidance for use of the battery device in subsequent process.