Battery Cell Impedance Measurement With Separated Detection Timing
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Solution Overview
Problem
Existing impedance measurement apparatuses face challenges in accurately measuring the impedances of multiple battery cells due to signal interference between adjacent detection modules, which leads to inaccurate impedance calculations and reduced reliability.
Innovation Solution
The apparatus includes a controller that classifies detection modules into groups based on their arrangement order and adjusts detection times to minimize noise interference, ensuring accurate impedance measurements by separating signal detection times and reducing noise influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple detection modules are used to measure impedances of multiple battery cells simultaneously, then measurement efficiency is improved, but signal interference between adjacent detection modules occurs leading to measurement precision degradation
Solution Approach 1:
The patent divides the detection process into separate time slots for different detection modules. Each detection module is assigned a specific detection time window, transforming simultaneous measurements into sequential measurements. This time-based segmentation eliminates signal interference between adjacent detection modules while maintaining the ability to measure multiple battery cells, thus resolving the contradiction between measurement efficiency and precision.
2Measurement precision
If detection time is extended to improve signal detection accuracy, then measurement precision is improved, but response signal distortion from adjacent modules increases
Solution Approach 1:
The patent implements periodic detection cycles where each detection module operates in its designated time slot within a repeating measurement cycle. This periodic structure ensures that each module detects signals during interference-free intervals, maintaining detection accuracy without exposing the system to cumulative distortion from adjacent modules. The cyclic nature allows systematic rotation through all detection modules while preserving signal integrity.
Data Source
AI summary
An impedance measurement apparatus according to an embodiment of the present disclosure includes a plurality of sensors configured to detect response signals respectively corresponding to a plurality of battery cells and a controller configured to calculate impedances respectively corresponding to the plurality of battery cells based on the response signals, in which each of the plurality of sensors includes a power supply configured to supply input power to a corresponding battery cell of the plurality of battery cells and a detector configured to detect a response signal of the corresponding battery cell of the plurality of battery cells during a detection time, wherein the response signal is responsive to the input power, and the controller is further configured to adjust the detection time for the plurality of sensors.