CN105759110A - Leak current testing method for anti-open-circuit protection diode assembly of hydrogen-nickel battery - Google Patents

Abstract

The invention relates to a leakage current testing method for an anti-open circuit protection diode assembly of a nickel-hydrogen storage battery for space use. The invention belongs to the technical field of testing components of nickel-hydrogen storage battery packs. A method for testing leakage current of a nickel-hydrogen storage battery anti-open-circuit protection diode assembly for space, which is characterized in that: the leakage current test method for a nickel-hydrogen storage battery anti-open-circuit protection diode assembly for space uses a ready-made DC power supply and a digital multimeter with voltage and current measurement functions , through the connection of wires, build a set of anti-open-circuit protection diode assembly leakage current test device for space-use nickel-hydrogen battery, through the simple switch between voltage and current measurement functions, adjust the output voltage of the power supply, measure the leakage current of the diode assembly, and realize the anti-open circuit protection Diode component leakage current test. The invention has the advantages of simple testing method, reliable performance, portable and flexible testing equipment, high testing efficiency and high measuring precision.

Description

Leakage current test method for anti-open circuit protection diode assembly of nickel-hydrogen battery for space use

technical field

The invention belongs to the technical field of testing components of nickel-hydrogen battery packs, in particular to a leakage current testing method for an anti-open circuit protection diode assembly of a nickel-hydrogen battery for space use.

Background technique

At present, in order to improve the reliability of the nickel-hydrogen battery pack and prevent the failure of a single battery due to an open circuit failure, an anti-open circuit protection diode assembly is required to be connected in parallel between the positive and negative poles of each single battery on the battery pack. This component is a cold backup device. One of the main technical indicators is that the applied voltage is 1.6V and the leakage current is less than 20mA. When the nickel-hydrogen battery is working normally, the battery voltage is generally between 1.0 and 1.55V. voltage, the current conducted in the diode assembly is very small. Only when the single battery fails in open circuit, the diode components connected in parallel will no longer be clamped by the battery voltage, and the withstand voltage will exceed 1.6V, and the components connected in parallel will conduct forward and play the role of bypass current. In order to determine the performance of the diode assembly, it is generally necessary to measure the leakage current of the diode assembly 100% when the voltage of 1.6V is applied (required to be less than 20mA) before and after the wire bonding of the diode assembly.

Through the search, there is no test method for the leakage current of the anti-open-circuit protection diode assembly of the space-use nickel-hydrogen battery. Generally, the leakage current of diode components is tested with an oscilloscope. The test equipment is bulky and expensive. The intuitive result is an I-V characteristic curve. It is necessary to estimate the leakage current at a specific voltage according to the curve, and the measurement accuracy is poor. Or use the TLP (Transmission Line Pulse) test system test, the retrieved TLP method uses short pulses (20-200ns) to measure the current/voltage characteristics of the ESD protection circuit in the integrated circuit. TLP adopts a relatively simple two-terminal test system, which is easy to repeat and has high practicability. However, this method requires special instruments with the function of forming simple pulses, and is mainly suitable for high-volume chip-level testing. There are technical problems such as inability to quickly, conveniently and accurately test the leakage current of the "Ni-MH battery anti-open circuit protection diode assembly for space use" (including multiple diodes in series and parallel structure).

Contents of the invention

In order to solve the technical problems existing in the known technology, the invention provides a leakage current testing method for the anti-open circuit protection diode assembly of the nickel-hydrogen storage battery for space use.

The object of the present invention is to provide a kind of testing method for the leakage current of the anti-open circuit protection diode assembly of the nickel-hydrogen storage battery for space with the characteristics of simple testing method, reliable performance, portable and flexible testing equipment, high testing efficiency and high measurement accuracy.

In order to improve measurement accuracy and measurement efficiency, the present invention uses ready-made DC power supply and digital multimeter (with voltage and current measurement functions), connects through wires, and simply switches between voltage and current measurement functions, and uses common instruments and equipment to build a A set of anti-open circuit protection diode component leakage current test system. The test system only needs: 1 small DC power supply (capable of outputting 1.6V voltage), 1 piece of digital multimeter (~1.6V voltage, ~1A current measurement function) and 3 thin wires (can withstand maximum 1A current, each wire Weld clips or binding posts at both ends to form cable 1, cable 2, and cable 3). Connect according to the diagram to form a leakage current test system for nickel-hydrogen battery anti-open circuit protection diode components.

The method for preventing open-circuit protection diode assembly leakage current of a nickel-hydrogen storage battery for space of the present invention comprises the following steps: 1. Making measuring cables (3); 2. Connecting measuring lines; 3. Adjusting the output voltage of a power supply; 4. Measure diode assembly leakage current.

The technical scheme adopted by the leakage current testing method of the nickel-hydrogen storage battery anti-open circuit protection diode assembly for space of the present invention is:

A method for testing leakage current of a nickel-hydrogen storage battery anti-open-circuit protection diode assembly for space, which is characterized in that: the leakage current test method for a nickel-hydrogen storage battery anti-open-circuit protection diode assembly for space uses a ready-made DC power supply and a digital multimeter with voltage and current measurement functions , through the connection of wires, build a set of anti-open-circuit protection diode assembly leakage current test device for space-use nickel-hydrogen battery, through the simple switching between voltage and current measurement functions, adjust the output voltage of the power supply, measure the leakage current of the diode assembly, and realize the anti-open circuit protection Diode component leakage current test.

In the present invention, the leakage current test method of the nickel-hydrogen storage battery anti-open circuit protection diode assembly for space can also adopt the following technical scheme:

The leakage current test method of the nickel-hydrogen storage battery anti-open circuit protection diode assembly for space is characterized in that the output voltage of the DC power supply is 1.6V, and the range of the digital multimeter reaches 1.6V voltage and 1A current.

The leakage current test method of the nickel-hydrogen storage battery anti-open circuit protection diode assembly for space is characterized in that the wires are 3 connecting wires capable of withstanding 1A current, and the two ends of each wire are welded with clips or binding posts to form a cable.

The advantages and positive effects that the present invention has are:

The leakage current test method of the anti-open circuit protection diode assembly of nickel-hydrogen battery for space is due to the adoption of the new technical solution of the present invention. Compared with the prior art, the present invention has the following characteristics:

1. The test equipment is portable and flexible. The performance requirements of the power supply and multimeter are low, the equipment is small, easy to find, and has little conflict. During the test, it is temporarily built with thin wires, and the test process is not limited by the site;

2. The test method is simple. After setting up the equipment according to the test schematic diagram, it is simple to use special wires to connect, and use alligator clips to clamp the forward and reverse terminals of the diode component for measurement, and the measurement results are stable;

3. High testing efficiency. This test method fully replaces the test method of the oscilloscope, and the test time is increased from 1 minute/piece to 10 seconds/piece;

4. High measurement accuracy. Leakage current measurement accuracy is from the original 1mA level to 0.01mA, which can more intuitively compare the leakage current changes of diode components before and after wire bonding, and judge the consistency of diode performance very well.

Description of drawings

Fig. 1 is a connection schematic diagram of the leakage current test circuit of the anti-open-circuit protection diode assembly of the nickel-hydrogen battery for space use.

In the figure, 1-cable 1, 2-diode assembly, 3-cable 2, 4-DC power supply, 5-cable 3, 6-digital multimeter.

detailed description

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Refer to Figure 1.

Example 1

The invention discloses a leakage current testing method of an anti-open-circuit protection diode assembly of a nickel-hydrogen battery used in space, which can quickly and accurately measure the leakage current of an anti-open-circuit protection diode assembly of a nickel-hydrogen battery under common electrical equipment conditions (one power supply and one digital multimeter). By making three simple cables, connect the power supply, digital multimeter and the protection diode assembly under test, use the power supply to add a reverse bias voltage at both ends of the protection diode assembly, and then use the digital multimeter to confirm that the voltage value is within the required range, and then Switch the digital multimeter to the current measurement position and connect the protection diode assembly to quickly and accurately measure the forward leakage current of the protection diode assembly under the specified reverse bias voltage. The leakage current test method of nickel-hydrogen battery anti-open circuit protection diode components for this space is simple, the test equipment is light and flexible, the test efficiency and measurement accuracy are high, and it is not limited by the site. It is especially suitable for the rapid confirmation of the main parameters of the components before the battery pack is assembled.

Concrete implementation steps of the present invention include:

1. Connect the power supply and digital multimeter with the pre-made cables;

2. Turn on the power and confirm the output voltage with a digital multimeter;

3. Switch the voltage measurement function of the digital multimeter to the current measurement function according to the instrument operation instructions;

4. Access the anti-open circuit protection diode assembly;

5. Measure and record the leakage current value;

6. Replace the protection diode component under test, and measure its leakage current value in the same way;

7. Every time a certain number of protective diode components are measured, use the voltage measurement function of the digital multimeter to confirm whether the power supply voltage is within the normal range.

By adopting the method of the present invention, it is possible to quickly and easily measure the leakage current of the protection diode assembly to be installed on the nickel-hydrogen storage battery pack more accurately, and it can well ensure the reliability of the protection diode assembly and the storage battery pack for the nickel-hydrogen storage battery. sex.

The concrete test process of this embodiment:

1. Make the cable: take 3 wires, the length of which is 0.5m. Cable 1: One end is soldered to a red terminal (connected to the positive voltage meter), and the other end is soldered to a red alligator clip (to clamp the positive diode component); Cable 2: one end is soldered to a red wiring fork (connected to the positive power supply), and the other end is soldered to a black alligator clip (Clamp the negative of the diode component); Cable 3: one end is welded to a black terminal (connected to the negative of the voltmeter), and the other end is welded to a black terminal (connected to the negative of the power supply);

2. Wiring: the terminal of cable 1 is connected to the voltage measurement positive on the voltmeter (red hole); the wiring fork of cable 2 is connected to the power supply positive; ), the other end of the wiring fork connected to the negative power supply;

3. Adjust the output voltage of the power supply: Make sure the digital multimeter is adjusted to the voltage measurement file (DCV file), the alligator clip (red) on cable 1 and the alligator clip (black) on cable 2 are clipped together, then turn on the power and monitor Adjust the output voltage value to 1.6V according to the voltage reading on the voltmeter;

4. Switch from the voltage measurement function to the current measurement function: Disassemble the red and black alligator clips, and the voltmeter switches from the voltage measurement function to the current measurement function (if it is Agilent 34401A, switch the voltage measurement mode to the current measurement mode: press the shift key first , and then press the DCA file);

5. Connect to the anti-open circuit protection diode assembly: the black clip clips the total negative of the anti-open circuit protection diode assembly of the hydrogen-nickel battery (the lead wire on the ceramic column of the diode assembly, one column is enough, and the two columns are connected in parallel), the red clip Clamp the positive diode assembly (the lead wire on the diode case);

6. Measure and record the leakage current value: read out the measured value on the digital multimeter, which is the leakage current value of the diode component, and record it;

7. Replace the protection diode component: the black clip clamps the total negative of another nickel-hydrogen battery anti-open circuit protection diode component, the red clip clamps the diode component positive, replaces other protection diode components, and measures its leakage current value in the same way:

Power supply voltage confirmation: every time 10 diode components are measured, switch the digital multimeter from the current measurement position to the voltage measurement position (press the DCV position), clamp a piece of red and black clips, monitor the voltage value, and confirm whether the power supply voltage is still 1.6V.

This embodiment has positive effects such as simple test method, reliable performance, portable and flexible test equipment, high test efficiency and high measurement accuracy.

Claims (3)

1. the anti-open-circuit-protection diode assembly drain current test method of hydrogen nickel storage battery for space, it is characterized in that: hydrogen nickel storage battery for space anti-open-circuit-protection diode assembly drain current test method is to utilize ready-made DC source and possess voltage, the digital multimeter of current measurement function, connected by wire, build the anti-open-circuit-protection diode assembly leakage current test device of a set of hydrogen nickel storage battery for space, pass through voltage, simple switching between current measurement function, adjust electric power output voltage, measuring diode assembly leakage current, realize the test of anti-open-circuit-protection diode assembly leakage current.

2. the anti-open-circuit-protection diode assembly drain current test method of hydrogen nickel storage battery for space according to claim 1, is characterized in that: DC power output voltage is 1.6V, digital multimeter range reaches 1.6V voltage, 1A electric current.

3. the anti-open-circuit-protection diode assembly drain current test method of hydrogen nickel storage battery for space according to claim 1, is characterized in that: wire is 3 connection wires that can bear 1A electric current, and each wire two ends weld clip or binding post constitute cable.