Battery Short-Circuit Detection via Self-Discharge Convergence Mapping
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Solution Overview
Problem
Existing battery inspection methods face challenges in accurately detecting short-circuit failures due to temperature fluctuations, which can cause self-discharge currents to be difficult to converge, leading to prolonged inspection times and reduced accuracy.
Innovation Solution
A battery inspection method and system that includes a preliminary step involving electrolyte injection, permeation, charging, high-temperature aging, and cooling, with data collection and analysis using a convergence value map to determine short-circuit failures based on voltage, current, temperature, and ambient temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery inspection is performed using self-discharge current convergence method, then short-circuit failure can be detected, but inspection time becomes excessively long when temperature fluctuates
Solution Approach 1:
The patent applies preliminary action by performing a preliminary step before the main self-discharge inspection. This preliminary step includes charging the battery to a predetermined voltage and allowing it to rest for a predetermined time, which stabilizes the battery state beforehand. This pre-stabilization enables the subsequent self-discharge current to converge faster, reducing inspection time while maintaining detection accuracy.
Solution Approach 2:
The patent utilizes parameter changes by establishing predetermined relationships between temperature parameters (ambient temperature, battery temperature) and time parameters (rest time, inspection time). Based on the measured temperature parameters, the system determines appropriate rest times and inspection durations, optimizing the inspection process to achieve convergence faster under varying temperature conditions.
2Device complexity
If battery inspection is performed without preliminary stabilization step, then inspection process is simpler, but self-discharge current convergence becomes difficult under temperature fluctuation
Solution Approach 1:
The patent introduces a preliminary stabilization step that charges the battery to a predetermined voltage and maintains it for a predetermined rest time before conducting the self-discharge inspection. This preliminary action ensures the battery reaches a stable state, making the self-discharge current convergence reliable even when temperature fluctuates, without significantly complicating the overall inspection process.
Solution Approach 2:
The patent employs self-service by utilizing the battery's own charging and resting processes to achieve stabilization. The battery is charged to a predetermined voltage and allowed to rest, during which it self-stabilizes its internal state. This self-stabilization mechanism ensures reliable current convergence without requiring external intervention or complex control systems.
3Adaptability or versatility
If ambient temperature changes during inspection, then inspection adaptability to real-world conditions is improved, but self-discharge current magnitude changes making convergence difficult
Solution Approach 1:
The patent applies parameter changes by establishing predetermined relationships between temperature parameters (ambient temperature, battery temperature) and time parameters (rest time, inspection time). The system measures the actual temperature parameters and determines appropriate inspection parameters based on predetermined relationships, allowing accurate convergence determination across varying temperature conditions while maintaining adaptability to real-world environments.
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
Enables accurate detection of short-circuit failures even with temperature fluctuations, reducing inspection time and improving accuracy by using a convergence value map that accounts for various parameters affecting self-discharge current convergence.
Implementation Method 1
inspecting short circuit failures in a battery based on a self-discharge current of the battery
Implementation Method 2
injecting an electrolyte into a case containing an electrode assembly, and causing the injected electrolyte to permeate the electrode assembly
Data Source
AI summary
The battery inspection method includes the following. Self-discharging the battery to be inspected until a predetermined time elapses from the start of self-discharging. Detecting a voltage, a current, a temperature of the battery and an ambient temperature when the predetermined time elapses. Perform a preliminary step prior to self-discharge of the battery. Obtain preliminary step information representing the execution conditions of the preliminary step. Calculating the current convergence value from the acquired preliminary step information, the detected voltage, current, and temperature, and the detected ambient temperature by referring to a predetermined correspondence between the preliminary step information, the voltage, current, and temperature of the battery at the time when the predetermined time elapses, the ambient temperature, and the current convergence value. Determining whether a short circuit failure of the battery has occurred based on the calculated current convergence value.