Battery Short-Circuit Detection Using Voltage-Step Current Response
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Solution Overview
Problem
Current methods for detecting internal short circuits in batteries are inaccurate due to excessive errors in collecting characteristic parameters, leading to low precision and safety concerns.
Innovation Solution
A detection method that adjusts the battery voltage slightly lower than the current voltage and monitors the current response over a duration to determine if an internal short circuit is present, differentiating between batteries with and without short circuits based on current variations without requiring precise parameter values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a collected characteristic parameter of a battery is compared with a preset value to identify internal short circuit, then the detection method is simple, but the precision of recognition is low due to excessive errors in characteristic parameter collection
Solution Approach 1:
The patent changes the detection parameter from static characteristic parameters (voltage, temperature) to dynamic current response parameters. By applying a voltage step change and measuring the resulting current response over time, the system captures the battery's dynamic electrical characteristics, which are more sensitive to internal short circuits while reducing measurement errors.
Solution Approach 2:
The patent transitions from static detection to dynamic detection by applying a voltage step change and observing the current response over time. The dynamic current response characteristics reveal internal short circuit conditions more accurately than static parameter comparisons, as the transient behavior exposes internal defects that static measurements may miss.
2Reliability
If the specific value of characteristic parameter is collected to detect internal short circuit, then the detection can be performed, but excess errors occur resulting in inaccurate detection results
Solution Approach 1:
The patent implements feedback by continuously monitoring the current response during the voltage step change and comparing it against expected response patterns. This feedback mechanism allows the system to identify internal short circuits based on deviations from normal current behavior, improving reliability without requiring high-precision absolute measurements.
Solution Approach 2:
The patent replaces direct measurement of difficult-to-obtain precise characteristic parameters with an electrical measurement approach using current response. By substituting the measurement method from direct parameter collection to observing electrical response behavior, the system achieves higher reliability while avoiding the measurement precision limitations of traditional approaches.
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 the accuracy of internal short circuit detection, reduces errors, and provides a reliable warning signal, improving battery safety by allowing timely replacement and preventing safety accidents.
Implementation Method 1
A current voltage of the battery is adjusted to a requested voltage slightly lower than the current voltage, and a current of the battery varies accordingly. Since a battery in which an internal short circuit occurs and a battery in which an internal short circuit does not occur are different for current response generated by variation of a charging voltage
Data Source
AI summary
Embodiments of the present application provide a detection method and detection device for a battery, a battery management system, and a storage medium. The method may include: acquiring a current voltage of a battery; sending a charging request to a charging device, the charging request including a requested voltage, the charging request being used to request the charging device to output the requested voltage to the battery, where the requested voltage may be smaller than the current voltage; acquiring a current of the battery within a duration in which the charging device outputs the requested voltage to the battery; and determining an internal short circuit condition of the battery according to the current.