Battery Negative Electrode Bonding to Prevent Micro Shorts
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Solution Overview
Problem
Nonaqueous electrolyte secondary batteries face issues with micro short circuits due to foreign metal substances, which are difficult to dissolve and precipitate on the negative electrode, leading to delayed micro short circuits during battery usage.
Innovation Solution
The battery design involves bonding the ends of the negative electrode active material layer and the separator to prevent foreign metal substances from being included between them, thereby suppressing the occurrence of micro short circuits by ensuring they are dissolved during the aging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If foreign metal substances are included in the battery case as impurities, then the battery manufacturing process is simplified, but micro short circuits occur during battery usage due to delayed dissolution and precipitation
Solution Approach 1:
The patent applies preliminary action by bonding the negative electrode active material layer to the separator before foreign metal substances can cause harm. This preventive bonding is performed during the aging process, ensuring that even if foreign metal substances are present, they cannot migrate and cause micro short circuits. The bonding is established in advance to eliminate the harmful effect of included impurities.
2Measurement precision
If aging is applied to dissolve foreign metal substances, then detection accuracy is improved, but production time is extended due to delayed dissolution of substances between separator and negative electrode
Solution Approach 1:
The patent performs the bonding action during the aging process itself, combining the detection function with the preventive action. By bonding the negative electrode active material layer to the separator while aging is in progress, the patent eliminates the need for extended aging time after the bonding is complete. This integrated approach maintains high detection accuracy while reducing total production time.
3Device complexity
If foreign metal substances are included between separator and negative electrode, then manufacturing complexity is reduced, but delayed micro short circuits occur during battery usage
Solution Approach 1:
The patent applies preliminary action by establishing the bond between the negative electrode active material layer and the separator before the battery is put into service. This bonding prevents foreign metal substances from migrating between these components during battery operation. The preventive measure is simple to implement and does not significantly increase device complexity, yet it effectively eliminates delayed micro short circuits.
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 configuration effectively reduces the likelihood of micro short circuits, allowing for accurate detection of defective products and providing a high-quality battery with enhanced safety and reliability, suitable for applications requiring high safety and reliability, such as vehicle power supplies.
Implementation Method 1
The included foreign metal substances can be ionized in an environment that exceeds a dissolved potential as a result of charging, and then dissolved into an electrolyte
Implementation Method 2
The ionized foreign metal substances migrate toward the negative electrode during charging
Implementation Method 3
The ionized foreign metal substances migrate toward the negative electrode during charging, and locally precipitate on the opposing negative electrode
Data Source
AI summary
A nonaqueous electrolyte secondary battery includes: an electrode assembly; a nonaqueous electrolyte; and a battery case. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode active material layer. The negative electrode includes a negative electrode active material layer. The separator is interposed between the positive electrode and the negative electrode. The battery case accommodates the electrode assembly and the nonaqueous electrolyte. Ends of contact faces of the negative electrode active material layer and the separator are at least partially bonded to each other.