Fuel cell scanning type voltage and impedance detection device

Abstract

The utility model discloses a fuel cell scanning type voltage and impedance detection device which is provided with a control unit, the control unit is connected with a detection channel unit and an alternating current injection unit, and the number of detection channels of the detection channel unit is consistent with the number of single cells in a detected combustion cell. The AC injection unit is connected with the detection channel unit, the output of the detection channel unit is connected with the voltage processing unit, one output of the voltage processing unit is connected with the A / D conversion unit, the other output of the voltage processing unit is connected with the impedance detection unit, and the impedance detection unit is connected with the A / D conversion unit. The device is simple in structure, is not limited by a detection channel, can achieve the quick detection of the voltage and impedance of a fuel cell, can achieve the detection of the voltage and impedance of each cell, is higher in detection efficiency, is good in stability, and can guarantee the normal work of a fuel cell system.

Description

Technical Field

[0001] This utility model relates to a fuel cell testing device, and more particularly to a fuel cell scanning voltage and impedance testing device. Background Technology

[0002] Fuel cells typically consist of dozens or hundreds of individual cells. The overall performance of a fuel cell depends on each individual cell. To ensure the fuel cell system operates stably, each cell needs to be monitored in real time. Currently, fuel cell monitoring devices generally use integrated acquisition chips, which are not only expensive and limited in the number of cells that can be monitored, but also can only detect cell voltage, failing to simultaneously detect voltage and impedance. Impedance comprehensively reflects the internal chemical composition and membrane health of the fuel cell, serving as a crucial indicator of its health. However, existing impedance detection devices cannot detect the impedance of a single fuel cell cell. Summary of the Invention

[0003] The present invention aims to solve the aforementioned technical problems existing in the prior art by providing a fuel cell scanning voltage and impedance detection device.

[0004] The technical solution of this utility model is: a scanning voltage and impedance detection device for fuel cells, characterized in that: a control unit is provided, the control unit is connected to a detection channel unit and an AC injection unit, the number of detection channels of the detection channel unit is consistent with the number of individual cells in the fuel cell under test, the AC injection unit is connected to the detection channel unit, the output of the detection channel unit is connected to a voltage processing unit, one output of the voltage processing unit is connected to an A / D conversion unit, and the other output is connected to an impedance detection unit, the impedance detection unit is connected to the A / D conversion unit.

[0005] Preferably, the detection channel unit consists of multiple relays or multi-channel logic devices.

[0006] Preferably, the AC injection unit is a square wave or triangular wave generator.

[0007] Preferably, the voltage processing unit is a resistive voltage divider measurement circuit or a differential measurement circuit.

[0008] Preferably, the impedance detection unit is an automatic balancing bridge detection circuit or an AC impedance detection circuit.

[0009] This invention utilizes a detection channel unit to achieve voltage acquisition of a single battery cell via channel switching, allowing for terminal voltage measurement without interference from other cells. The voltage processing unit controls the voltage output in real time, simulating the characteristics of a fuel cell voltage, ensuring the detection state matches the operational state and improving detection reliability. The detected voltage signal is processed by an impedance detection unit to detect the impedance of a single battery cell; voltage and impedance are acquired simultaneously without interference. This invention is not limited by detection channels, enabling rapid detection of both fuel cell voltage and impedance, and allowing for the detection of voltage and impedance of each individual battery cell. It boasts high detection efficiency and good stability, thus ensuring the normal operation of the fuel cell system. Attached Figure Description

[0010] Figure 1 This is a circuit diagram of an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram of the usage state of an embodiment of this utility model.

[0012] Figure 1 , 2 The components are: 1. Control unit; 2. Detection channel unit; 3. AC injection unit; 4. Voltage processing unit; 5. AD conversion unit; 6. Impedance detection unit; 7. Fuel cell under test. Detailed Implementation

[0013] This utility model discloses a scanning voltage and impedance detection device for a fuel cell, the circuit of which is as follows: Figure 1 The diagram shows a control unit 1, which can be a microcontroller. The control unit 1 is connected to a detection channel unit 2 and an AC injection unit 3. The detection channel unit 2 consists of multiple relays or multi-channel logic controllers, and the number of its detection channels is consistent with the number of individual cells in the tested combustion battery. The AC injection unit 3 is a square wave or triangular wave generator, and it is connected to the detection channel unit 2. The output of the detection channel unit 2 is connected to a voltage processing unit 4, which can be a resistance voltage divider measurement circuit or a differential measurement circuit. One output of the voltage processing unit 4 is connected to an A / D conversion unit 5, and the other output is connected to an impedance detection unit 6, which is an automatic balancing bridge detection circuit or an AC impedance detection circuit. The impedance detection unit 6 is connected to the A / D conversion unit 5.

[0014] During testing, the detection channel of detection channel unit 2 is connected to each cell of the fuel cell under test. Control unit 1 controls the detection channel to be turned on and controls AC injection unit 3 to continuously inject AC signals according to the channel switching state; voltage processing unit 4 performs differential processing on the two conducting voltages to obtain the single cell voltage of the fuel cell; impedance detection unit 6 processes the voltage obtained by voltage processing unit to obtain the single cell impedance of fuel cell; A / D conversion unit 5 converts the detected voltage and impedance from analog to digital quantities to provide digital signals for the next communication unit.

[0015] The control steps employed by the control unit of this utility model are as follows:

[0016] Step 1: Let n=0, where n is the ordinal number of a single battery cell;

[0017] Step 2: Control the detection channel unit 2 to connect the nth and n+1th cells of the fuel cell 7 under test to the corresponding detection channels respectively;

[0018] Step 3: Control the AC injection unit 3 to inject a fixed frequency and current AC signal into the detection channel;

[0019] Step 4: After differential processing by voltage processing unit 4, the voltage is converted by AD conversion unit to obtain the voltage of the nth single cell of fuel cell 7; the voltage of the nth single cell is then processed by impedance detection unit 6 to obtain the impedance of the nth single cell of fuel cell, which is then converted by AD conversion unit.

[0020] Step 5: Determine if n is equal to N-1, where N is the total number of single batteries. If yes, the inspection ends; otherwise, proceed to step 4.

[0021] Step 6: Move n←n+1 and return to step 2.

Claims

1. A scanning voltage and impedance detection device for fuel cells, characterized in that: The application discloses a battery impedance detection device, which comprises a control unit (1), a detection channel unit (2) and an alternating current injection unit (3).

2. The fuel cell scanning voltage and impedance detection device according to claim 1, characterized by: The detection channel unit (2) is composed of a plurality of relays or a multi-channel logic unit.

3. The fuel cell scanning voltage and impedance detection apparatus according to claim 2, characterized by: The alternating current injection unit (3) is a square wave or triangular wave generator.

4. The fuel cell scanning voltage and impedance detection apparatus according to claim 3, characterized by: The voltage processing unit (4) is a resistance voltage dividing measurement circuit or a differential measurement circuit.

5. The fuel cell scanning voltage and impedance detection apparatus according to claim 4, characterized by: The impedance detection unit (6) is an automatic balance bridge detection circuit or an alternating current impedance detection circuit.

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