Secondary Cell State Detector High-Speed Voltage Measurement
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Solution Overview
Problem
Conventional secondary cell state detectors are unable to measure differential voltage at high speeds due to the need for a significant time interval between sampling electrode-to-electrode voltages using two condensers, which limits continuous measurement.
Innovation Solution
A secondary cell state detector design that includes a condenser connected to both electrodes of the cell, with a first switch and a differential amplifier circuit allowing for high-speed differential voltage detection by connecting one-side electrodes to the amplifier inputs, and an additional switch for electrode-to-electrode voltage detection without waiting for condenser charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two condensers are used to sample electrode-to-electrode voltages in two states, then the internal resistance can be accurately detected, but the measurement speed is limited due to the required charging time of condensers
Solution Approach 1:
The condenser charges the electrode-to-electrode voltage in advance during the first state (charging state), so that when the second state (discharge suspended state) is reached, the voltage is already stored and can be immediately compared without waiting for charging time, thus achieving high-speed accurate measurement
2Measurement precision
If the sampling interval is set to accommodate condenser charging time, then accurate voltage comparison can be made, but continuous high-speed measurement cannot be achieved
Solution Approach 1:
The system continuously switches between charging state and discharge suspended state, with the condenser continuously charging during the first state and continuously discharging during the second state, enabling continuous high-speed measurement cycles without idle waiting time
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 high-speed detection of secondary cell states and internal resistance without the delay associated with condenser charging, allowing for more accurate and timely monitoring of battery health.
Implementation Method 1
a condenser Co, a first switch SW1... turns ON the first switch to connect both electrodes of the secondary cell to both plates of the condenser
Implementation Method 2
a differential amplifier circuit 4 having a first input to which the one-side plate of the condenser is connected and a second input to which the one-side electrode of the secondary cell is connected, the differential amplifier circuit outputting a differential voltage of the first input and the second input
Data Source
AI summary
A condenser is connected to both electrodes of a secondary cell. A first switch is provided between a positive electrode of the secondary cell and a one-side plate of the condenser. An MCU turns ON the first switch when the secondary cell is in a first state to connect both electrodes of the secondary cell to both plates of the condenser, and then turns OFF the first switch. In addition, thereafter, the MCU detects a state of the secondary cell based on a differential voltage output from a differential amplifier circuit when the secondary cell is in a second state.