Integrated Waveform Generator for Battery Impedance Detection
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Solution Overview
Problem
Existing battery management systems face challenges in accurately monitoring battery state parameters like SOC, SOH, and DCR due to complex calculations and the high cost, large volume, and complexity of electrochemical impedance spectroscopy (EIS) detection systems, making them unsuitable for real-time applications in battery usage processes.
Innovation Solution
Integration of a waveform generator within a battery monitoring chip to generate excitation currents for EIS detection, reducing the need for additional devices and simplifying the detection process, enabling cost-effective and compact EIS detection within a battery management system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional EIS detection systems are used for battery state monitoring, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines the EIS detection function with the existing battery management system chip by integrating a waveform generator module. This merging eliminates the need for separate external EIS detection devices, reducing system complexity and cost while maintaining the ability to perform accurate impedance spectroscopy measurements for battery state monitoring.
Solution Approach 2:
The battery management system chip is designed to perform multiple functions simultaneously: it monitors basic battery parameters (voltage, current, temperature) and integrates EIS detection capabilities through the waveform generator. This multi-functional design allows a single chip to replace multiple separate devices, simplifying the overall system architecture.
2Measurement precision
If external EIS detection devices are added to improve measurement precision, then detection accuracy is improved, but volume and cost increase
Solution Approach 1:
The waveform generator module is nested within the existing battery management system chip structure. This nesting approach allows the EIS detection functionality to be embedded inside the already-present chip, eliminating the need for additional external components and reducing overall system volume while maintaining detection accuracy.
3Measurement precision
If complex calculation methods are used to determine battery state parameters, then measurement precision is improved, but productivity and real-time capability deteriorate
Solution Approach 1:
The waveform generator is pre-integrated into the battery management system chip during manufacturing, so that the EIS detection capability is already prepared and available. This preliminary integration eliminates the need for complex real-time calculations and external device communications during operation, enabling fast real-time impedance measurements.
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 solution allows for accurate, real-time battery state monitoring with high sensitivity, enabling early detection of subtle changes and improving the precision of state parameter estimation, thus enhancing the reliability and efficiency of battery management systems.
Implementation Method 1
Electrochemical impedance spectroscopy (EIS) is a response of an electrochemical system to an external excitation. It can be used to analyze internal resistance of the battery, electric-double-layer capacitance and faraday impedance etc.
Data Source
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AI summary
Embodiments of the present application provide a detection apparatus of electrochemical impedance spectroscopy and a battery management system, the detection apparatus including a waveform generator, where the waveform generator is integrated in a battery monitoring chip; an excitation resistor; a detection resistor; and an MOS switch, wherein the waveform generator is configured to generate a pulse waveform, a gate electrode of the MOS switch is configured to receive the pulse waveform; the excitation resistor is configured to enable the battery to generate an excitation current when the gate electrode of the MOS switch receives the pulse waveform; the detection resistor is configured to convert the excitation current into an excitation voltage, the excitation voltage is configured to calculate an electrochemical impedance of the battery, and electrochemical impedances of the battery under different frequencies are configured to form electrochemical impedance spectroscopy of the battery. The detection apparatus of electrochemical impedance spectroscopy in embodiments of the present application can lower cost and volume of EIS detection, enabling it to be widely applied in a BMS.