Laminated Battery Switch Timing Control for Noise Reduction
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Solution Overview
Problem
Noise is mixed into the circuit of a cell system connected to a fuel cell due to stray electrical capacitance between power lines, affecting the accuracy of state detection in fuel cell systems.
Innovation Solution
A cell system with a laminated battery, featuring a first switch connected to the positive electrode and a second switch connected to the negative electrode, where a controller adjusts the timing of switching these switches based on the electrical capacitance between them to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both switches are connected simultaneously when connecting the fuel cell to the electric motor, then the connection process is simple and fast, but noise is mixed into the detection circuit due to stray electrical capacitance between power lines
Solution Approach 1:
The patent applies preliminary action by connecting one switch (first switch on positive electrode side) before the other switch (second switch on negative electrode side) when establishing the connection between fuel cell and electric motor. This sequential connection approach prepares the circuit in a controlled manner, allowing the detection circuit to be connected to the power line before full power connection occurs, thereby preventing noise from stray capacitance from entering the detection circuit during the connection process.
2Object-affected harmful factors
If the first switch is connected before the second switch when disconnecting the fuel cell from the electric motor, then noise is suppressed in the detection circuit, but the disconnection process becomes more complex
Solution Approach 1:
The patent applies preliminary action in reverse during disconnection by first disconnecting the first switch (positive electrode side) before disconnecting the second switch (negative electrode side). This sequential disconnection ensures that the detection circuit remains isolated from the power line during the disconnection process, preventing noise from stray capacitance from entering the detection circuit, while maintaining relatively simple control logic.
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 approach reduces the peak surge current flowing into the electrical circuit, thereby minimizing noise and improving the accuracy of state detection and operation of the fuel cell system.
Implementation Method 1
a controller configured to shift control timings of the first switch and the second switch from the shut-off state to a connected state according to an electrical capacitance generated between the positive electrode and the negative electrode
Data Source
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AI summary
A cell system includes a laminated battery, a plurality of battery cells being laminated in the laminated battery, a first switch connected to a positive electrode of the laminated battery and configured to switch connection to the positive electrode to a shut-off state, and a second switch connected to a negative electrode of the laminated battery and configured to switch connection to the negative electrode to a shut-off state. Furthermore, the cell system includes a circuit to be connected at least either between the positive electrode and the first switch or between the negative electrode and the second switch; and a controller configured to shift control timings of the first switch and the second switch from the shut-off state to a connected state according to an electrical capacitance generated between the positive electrode and the negative electrode.