Slave BMS Antenna Circuit for Wireless Impedance Matching
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Solution Overview
Problem
Existing battery systems require additional components for wireless communication between battery management systems (BMSs), leading to issues with electrical wiring and maintenance, and lack impedance matching in various frequency bands.
Innovation Solution
A battery system with a slave BMS configuration that includes a communication unit, capacitors, and inductors for impedance matching, allowing wireless communication with a master BMS using a simple configuration and commonized PCB design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional components are added for wireless communication between BMSs, then wireless communication capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the communication unit serve dual functions: traditional wired communication and wireless communication through antenna mode. By configuring the existing communication unit to operate in antenna mode with appropriate impedance matching circuits, the system achieves wireless capability without adding separate wireless communication components, thus resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The patent combines the wireless communication function with the existing communication unit structure. The impedance matching circuit (including inductors and capacitors) is integrated into the communication unit, merging multiple functions into a single component structure, which reduces overall device complexity while maintaining wireless communication capability
2Adaptability or versatility
If impedance matching components are added for various frequency bands, then communication adaptability is improved, but device complexity increases
Solution Approach 1:
The patent employs switchable impedance matching circuits that can be dynamically configured for different frequency bands. The switching mechanism allows the communication unit to adapt its impedance characteristics based on the operating frequency band, providing multi-band adaptability without requiring separate fixed circuits for each band, thus managing circuit complexity while enhancing frequency band adaptability
Solution Approach 2:
The patent changes the electrical parameters (impedance values) of the communication circuit by switching between different inductor and capacitor configurations. This allows the same physical circuit to operate across multiple frequency bands by adjusting its electrical characteristics, achieving frequency adaptability without increasing physical circuit complexity
3Adaptability or versatility
If separate wireless communication components are added, then wireless communication is enabled, but manufacturing cost increases
Solution Approach 1:
The patent makes the existing communication unit multi-functional by enabling it to operate in both wired and wireless modes. This eliminates the need for separate wireless communication modules, reducing component count and manufacturing cost while maintaining wireless communication functionality
Solution Approach 2:
The communication unit serves itself by performing both wired and wireless communication functions through a single structure. The impedance matching circuit uses readily available components (inductors, capacitors, switches) that can be integrated into the existing communication unit manufacturing process, reducing additional manufacturing costs
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
Enables wireless communication between BMSs without additional components, reducing PCB size and cost, and supports communication in various industrial scientific and medical bands.
Implementation Method 1
a capacitor connected between the communication unit and a first ground, a first inductor and a second inductor connected in series between a contact between the first ground and the capacitor and a second ground, and a control unit configured to transmit an alternating current (AC) signal having a predetermined frequency to the communication unit in an antenna mode in which the slave BMS communicates with an outside, in which the second inductor is configured to include a wire so that a first antenna impedance determined by the first inductor matches a second antenna impedance of a master BMS that is a communication target
Implementation Method 2
the control unit configured to transmit an alternating current (AC) signal having a predetermined frequency to the communication unit in an antenna mode in which the slave BMS communicates with an outside
Data Source
AI summary
A battery system may include at least one battery module including a battery cell configuration unit and a slave battery management system (BMS) managing the battery cell configuration unit includes a communication unit of the slave BMS, a capacitor connected between the communication unit and a first ground, a first inductor and a second inductor connected in series between a contact between the first ground and the capacitor and a second ground, and a control unit transmitting an AC signal having a predetermined frequency to the communication unit in an antenna mode in which the slave BMS communicates with an outside. In addition, the second inductor may be configured of a wire so that a first antenna impedance determined by the first inductor matches a second antenna impedance of a master BMS that is a communication target.