Battery Impedance Measurement with Delay Compensation
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Solution Overview
Problem
Existing battery management systems face inaccuracies in index testing due to external temperature influences, limiting effective battery management in hybrid and electric vehicles.
Innovation Solution
A battery management device comprising an analog-digital converter, impedance measuring element, comparator, driving element, and excitation signal generator, which compensates for delays to accurately measure impedance, reflecting the State-of-Health and State-of-Charge of batteries, thereby enabling precise performance indexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature-based battery management is used, then the system can manage battery output power when temperature reaches a given limit, but the measurement is easily influenced by external temperature and other factors, resulting in insufficient measurement accuracy
Solution Approach 1:
The patent changes the measurement parameter from temperature to impedance. By measuring the impedance of the battery instead of its temperature, the system avoids the problem of external temperature influence on measurement accuracy. The impedance measurement reflects the actual battery state more accurately, enabling reliable battery management decisions.
2Measurement precision
If impedance measurement is performed without delay compensation, then the measurement process is simple, but the driving element and excitation signal generator introduce delay that reduces measurement accuracy
Solution Approach 1:
The patent introduces a feedback mechanism where the system measures the delay caused by the driving element and excitation signal generator, then uses this delay information to compensate for the measurement error. The delay compensation module adjusts the measurement timing or calculation based on the measured delay, thereby improving impedance measurement precision while accounting for the added system complexity.
Data Source
AI summary
The disclosure provides a battery management device, method, and a chip. The device includes: an analog-digital converter connected with a first power supply access terminal, a second power supply access terminal and an impedance measuring element: wherein the analog-digital converter is configured to achieve analog-digital conversion between an accessed power supply and the impedance measuring element; the impedance measuring element is further connected with a comparator and a driving element; the impedance measuring element is configured to test an impedance of the accessed power supply; the comparator is configured to compensate delay generated by the driving element and an excitation signal generator; and the driving element is configured to drive the battery management device to work; and the excitation signal generator is connected with the comparator, the driving element, the first power supply access terminal and the second power supply access terminal.