Wireless Battery Cell Diagnosis Using RF Signal Reflection
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Solution Overview
Problem
Existing battery management systems fail to accurately measure and diagnose detailed characteristics inside battery cells beyond voltage, current, and temperature using wireless BMS technology.
Innovation Solution
A battery management apparatus and method utilizing RF signals to diagnose battery cell states by measuring impedance, sensitivity changes, peak error rate, saturation level, and received signal strength indication, with a controller comparing RF signals to normal states and controlling switch operations for communication with battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless BMS technology is used to monitor battery cells, then ease of operation and system simplicity are improved, but measurement precision of detailed battery characteristics deteriorates
Solution Approach 1:
The patent introduces RF signals as an intermediary to indirectly measure detailed battery characteristics. Instead of directly measuring internal battery parameters, the system uses RF signal reflection properties (impedance, sensitivity, PER, saturation level, RSSI) as mediators that correlate with battery cell state, enabling precise measurements through wireless means
Solution Approach 2:
The patent replaces traditional direct electrical measurement systems with RF electromagnetic field-based measurement. By substituting mechanical/electrical contact methods with wireless RF signal interaction, the system achieves both ease of operation and maintains measurement precision through alternative physical principles
2Device complexity
If traditional voltage, current, and temperature measurement methods are used, then device complexity is reduced, but loss of information about detailed battery characteristics increases
Solution Approach 1:
The patent makes the RF transmitter serve multiple functions: it acts as both a communication device for wireless BMS operation and a measurement device for diagnosing battery characteristics. By transmitting RF signals and analyzing reflections, the same component gathers both operational and diagnostic information, eliminating the need for separate measurement systems
Solution Approach 2:
The battery cell itself serves as the measurement target and information source. By analyzing how the battery cell reflects RF signals (its impedance, sensitivity, and other RF characteristics), the system allows the battery to reveal its own detailed characteristics without requiring external specialized measurement equipment
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
Accurately measures and diagnoses battery cell states through RF signals, enabling failure prediction and safety enhancements without additional hardware, using RFIC for wireless communication.
Implementation Method 1
the second signal may be a reflected signal of the first signal
Data Source
AI summary
A battery management apparatus includes a communication unit configured to transmit a first signal to a battery cell, a switch configured to connect the communication unit to the battery cell, and a controller configured to control an operation of the switch, receive a second signal corresponding to the first signal, and diagnose a state of the battery cell based on the second signal.