二次电池的不良检测方法及装置
The method of rapid detection of internal short circuits in lithium secondary batteries by alternating impedance method and construction of equivalent circuit model solves the problems of long detection time and limited capability in the existing technology, and improves detection efficiency and safety.
CN116203444BActive Publication Date: 2026-07-17MIN TECH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MIN TECH
- Filing Date
- 2022-11-21
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing technologies require a long time to detect internal short circuits in lithium secondary batteries and have limited detection capabilities, posing safety hazards.
Method used
The AC impedance method is used to apply a small-amplitude AC signal at varying frequencies, measure the impedance magnitude and phase difference, construct an equivalent circuit model, analyze the characteristics of the electrochemical system, and determine whether the battery is faulty.
Benefits of technology
It enables rapid and accurate detection of internal short circuits in lithium secondary batteries, improving detection efficiency and safety.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN116203444B_ABST
Abstract
本发明公开利用交流阻抗法检测二次电池的不良的方法及实现该方法的装置。本发明的方法包括如下步骤：以调制频率的方式向二次电池施加输入信号来测定输出信号，从输入信号和输出信号算出基于频率的交流阻抗；将所算出的交流阻抗形成为奈奎斯特图，并基于此来构建等效电路模型；在等效电路模型中，将电荷转移电阻成分和电双层电容成分的乘积作为时间常数算出，或者在奈奎斯特图中，算出呈现在低频带的直线的斜率；比较时间常数和预设时间常数，或者比较所算出的直线的斜率的绝对值与预设斜率的绝对值；以及在时间常数小于预设时间常数或者所算出的直线的斜率的绝对值小于预设斜率的绝对值的情况下，将二次电池判断为不良。
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