A lithium battery test equipment line sequence detection device and method

Abstract

The application provides a lithium battery test equipment line sequence detection device and method in the technical field of lithium battery test, which comprises a host computer, a voltage acquisition board, a DCDC power supply, a single-chip microcomputer, a multi-channel switching board, a plurality of single-channel switching boards, a plurality of positive copper bars, a plurality of negative copper bars and a power module. The host computer is connected with the voltage acquisition board, the DCDC power supply and the single-chip microcomputer. One end of the multi-channel switching board is connected with the single-channel switching board, and the other end is connected with the single-chip microcomputer. The single-channel switching board is connected with the positive copper bar and the negative copper bar, and is arranged between the positive copper bar and the negative copper bar. The power module is connected with the single-chip microcomputer. The application has the advantage that the efficiency of lithium battery test equipment line sequence detection is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery testing, and particularly relates to a lithium battery testing equipment line sequence detection device and method. BACKGROUND

[0002] Lithium battery is a very important energy storage technology, and is widely used in portable electronic devices and new energy vehicles. With the advent of the era of new energy vehicles and smart grids, more and more lithium batteries have become the power source of new energy vehicles. With the increasing demand of the market for the endurance of new energy vehicles, the number of series of lithium battery cells also increases. After the production of lithium batteries, a series of tests need to be performed on the lithium batteries using lithium battery testing equipment, so that the number of voltage sampling lines and power lines of the lithium battery testing equipment also increases, which greatly increases the probability of line sequence errors (wiring errors) during the wiring process of the lithium battery testing equipment. Line sequence errors can cause battery management system failures, and even cause safety hazards and property losses. Therefore, the line sequence of the lithium battery testing equipment needs to be detected.

[0003] For the line sequence detection of the lithium battery testing equipment, the traditional method is to manually hold a multimeter and detect the line sequence according to the wiring schematic diagram, which has the disadvantages of time-consuming, labor-intensive and low efficiency.

[0004] Therefore, how to provide a lithium battery testing equipment line sequence detection device and method to improve the efficiency of lithium battery testing equipment line sequence detection has become a technical problem to be solved. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a lithium battery testing equipment line sequence detection device and method to improve the efficiency of lithium battery testing equipment line sequence detection.

[0006] In a first aspect, the present application provides a lithium battery testing equipment line sequence detection device, comprising a host computer, a voltage acquisition board, a DCDC power supply, a single-chip microcomputer, a multi-channel switching board, a plurality of single-channel switching boards, a plurality of positive copper bars, a plurality of negative copper bars, and a power module.

[0007] The host computer is connected with the voltage acquisition board, the DCDC power supply and the single-chip microcomputer; one end of the multi-channel switching board is connected with the single-channel switching board, and the other end is connected with the single-chip microcomputer; the single-channel switching board is connected with the positive copper bar and the negative copper bar, and is arranged between the positive copper bar and the negative copper bar; and the power module is connected with the single-chip microcomputer.

[0008] Further, the single-channel switching board comprises a MOS tube Q1, a MOS tube Q2, a MOS tube Q3 and a MOS tube Q4.

[0009] The D pole of the MOS tube Q1 is connected with the D pole of the MOS tube Q2 and the positive copper row, and the G pole is connected with the G pole of the MOS tube Q2 and the multi-channel switching board;

[0010] The D pole of the MOS tube Q3 is connected with the D pole of the MOS tube Q4 and the negative copper row, and the G pole is connected with the G pole of the MOS tube Q4 and the multi-channel switching board.

[0011] Further, the multi-channel switching board comprises a plurality of single-channel switching boards.

[0012] Further, the D pole of the MOS tube Q1 of the multi-channel switching board is connected with the D pole of the MOS tube Q2 and the single-channel switching board, and the G pole is connected with the G pole of the MOS tube Q2 and the single-chip microcomputer;

[0013] The D pole of the MOS tube Q3 of the multi-channel switching board is connected with the D pole of the MOS tube Q4 and the single-channel switching board, and the G pole is connected with the G pole of the MOS tube Q4 and the single-chip microcomputer.

[0014] Further, the model of the single-chip microcomputer is STM32F429.

[0015] Further, the model of the power module is LRS-150-24V.

[0016] In a second aspect, the present application provides a lithium battery test equipment line sequence detection method, comprising the following steps:

[0017] Step S1, place the multi-channel switching board, single-channel switching board, positive copper row and negative copper row of the line sequence detection device on the needle bed tray of the lithium battery test equipment, press the positive and negative probes of the lithium battery test equipment on the positive and negative copper rows respectively, and connect the power line and voltage acquisition board of the DCDC power supply to the positive and negative probes;

[0018] Step S2, the host computer controls the single-chip microcomputer to output 3.3V voltage, which is sequentially transmitted to the positive and negative copper rows through the multi-channel switching board and the single-channel switching board, and the host computer collects the first voltage value of the positive and negative probes through the DCDC power supply, and detects the wiring of the DCDC power line based on the deviation value of the first voltage value and 3.3V;

[0019] Step S3, the host computer controls the single-chip microcomputer to output 3.3V voltage, which is connected to the adjacent two single-channel switching boards through the multi-channel switching board, and the second voltage value of the single-channel switching board corresponding to the positive and negative probes is collected through the voltage acquisition board, and the wiring of the series power line of the adjacent channels is detected based on the deviation value of the second voltage value and 3.3V;

[0020] Step S4, the host computer controls the single-chip microcomputer to output 3.3V voltage, the 3.3V voltage is connected to all single-channel switching boards through a multi-channel switching board, and the third voltage values of all channels are sequentially collected through the voltage collection board; the line sequence of each voltage sampling line of the voltage collection board is detected based on the deviation values of the third voltage values and 3.3V;

[0021] Step S5, the host computer controls the output voltage of the DCDC power supply to be the channel number*0.5V, the fourth voltage values of all channels are collected through the voltage collection board, and whether the connection lines of all channels are short-circuited is detected based on the deviation values of the fourth voltage values and 0.5V;

[0022] Step S6, the host computer controls the DCDC power supply to output 100A current through the series connection of all channels by the single-channel switching boards, the fifth voltage values of all channels are collected through the voltage collection board, the voltage difference is calculated based on the fifth voltage values of all channels, the power line resistance value, the probe contact resistance value and the probe resistance value are calculated by dividing the voltage difference by the current, and whether the connection lines are reliable is detected;

[0023] Step S7, the positive and negative probes are separated, the host computer controls the output voltage of the DCDC power supply to be the channel number*0.5V, the sixth voltage values of all channels are collected through the voltage collection board, and whether the connection lines of all channels are mutually adjusted is detected based on the deviation values of the sixth voltage values and 0.5V.

[0024] The application has the advantages that:

[0025] By setting the host computer, voltage acquisition board, DCDC power supply, single-chip microcomputer, multi-channel switching board, single-channel switching board, positive copper bar, negative copper bar and power module, the host computer is connected with the voltage acquisition board, DCDC power supply and single-chip microcomputer, one end of the multi-channel switching board is connected with the single-channel switching board, the other end is connected with the single-chip microcomputer, the single-channel switching board is connected with the positive copper bar and negative copper bar respectively, and the power module is connected with the single-chip microcomputer; when the lithium battery test equipment is detected, the positive probe and negative probe of the corresponding channel are respectively pressed on the positive copper bar and negative copper bar, the host computer controls the single-chip microcomputer to output voltage, switches channels through the multi-channel switching board, and collects voltage values output by each channel through the voltage acquisition board and DCDC power supply, and based on the deviation of the output voltage value and the actual setting value and the power line resistance value, probe contact resistance value and probe resistance value calculated based on the voltage value, the DCDC power line connection, adjacent channel series power line connection, voltage sampling line sequence of the voltage acquisition board, whether the voltage sampling line of each channel is short-circuited, whether the connection is firm, and whether the voltage sampling line of each channel is adjusted automatically, without manually detecting one by one through the traditional handheld multimeter, the efficiency and comprehensiveness of the lithium battery test equipment line sequence detection are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described below with reference to the drawings and embodiments.

[0027] Fig. 1 is a circuit principle block diagram of a lithium battery test equipment line sequence detection device of the application.

[0028] Fig. 2 is a flow chart of a lithium battery test equipment line sequence detection method of the application. DETAILED DESCRIPTION

[0029] The technical solution in the embodiments of the application has the following general idea: the probe of the corresponding channel of the lithium battery test equipment is pressed on the positive copper bar and negative copper bar, the host computer controls the single-chip microcomputer to output voltage, switches channels through the multi-channel switching board, and collects voltage values output by each channel through the voltage acquisition board and DCDC power supply, and based on the deviation of the output voltage value and the actual setting value and the power line resistance value, probe contact resistance value and probe resistance value calculated based on the voltage value, the DCDC power line connection, adjacent channel series power line connection, voltage sampling line sequence of the voltage acquisition board, whether the voltage sampling line of each channel is short-circuited, whether the connection is firm, and whether the voltage sampling line of each channel is adjusted automatically, thereby improving the efficiency of the lithium battery test equipment line sequence detection.

[0030] Please refer to Figs. 1-2As shown, the preferred embodiment of the lithium battery test equipment line sequence detection device of the present application comprises a host computer, a voltage acquisition board, a DCDC power supply, a single-chip microcomputer, a multi-channel switching board, a plurality of single-channel switching boards, a plurality of positive copper bars, a plurality of negative copper bars, and a power module.

[0031] The single-channel switching board is used to simulate channel short circuit or open circuit state, is powered by 24V, and controls the MOS tube switch through an optical coupler; the single board can pass a maximum current of 200A; the multi-channel switching board is used to switch the voltage or current applied channel, is powered by 24V, and supports 16-channel signal transmission at the same time through an optical coupler; the positive copper bar and the negative copper bar are used to simulate the positive and negative electrodes of the battery, and are only used to pass voltage and current without chemical properties; the power module is used to power the single-chip microcomputer so that the single-chip microcomputer can output voltage externally; the single-chip microcomputer is connected with the multi-channel switching board through a signal line and a voltage line; and the multi-channel switching board is connected with each single-channel switching board through a signal line.

[0032] The host computer is connected with the voltage acquisition board, the DCDC power supply, and the single-chip microcomputer; one end of the multi-channel switching board is connected with the single-channel switching board, and the other end is connected with the single-chip microcomputer; the single-channel switching board is connected with the positive copper bar and the negative copper bar respectively, and is arranged between the positive copper bar and the negative copper bar; and the power module is connected with the single-chip microcomputer.

[0033] The single-channel switching board comprises a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, and a MOS tube Q4.

[0034] The D pole of the MOS tube Q1 is connected with the D pole of the MOS tube Q2 and the positive copper bar, and the G pole is connected with the G pole of the MOS tube Q2 and the multi-channel switching board.

[0035] The D pole of the MOS tube Q3 is connected with the D pole of the MOS tube Q4 and the negative copper bar, and the G pole is connected with the G pole of the MOS tube Q4 and the multi-channel switching board.

[0036] The multi-channel switching board comprises a plurality of single-channel switching boards.

[0037] The D pole of the MOS tube Q1 of the multi-channel switching board is connected with the D pole of the MOS tube Q2 and the single-channel switching board, and the G pole is connected with the G pole of the MOS tube Q2 and the single-chip microcomputer.

[0038] The D pole of the MOS tube Q3 of the multi-channel switching board is connected with the D pole of the MOS tube Q4 and the single-channel switching board, and the G pole is connected with the G pole of the MOS tube Q4 and the single-chip microcomputer.

[0039] The single-chip microcomputer is STM32F429, supports 220V / 24VG input power supply, supports 128-way extension IO port at most, is used for controlling the sampling mode of each single-channel switching board and voltage acquisition board, controlling 3.3V constant voltage source output, supporting Ethernet, 232 communication and 485 communication.

[0040] The power module is LRS-150-24V, the no-load consumption is less than 0.5W, the volume is small, the working temperature can reach 70 DEG C, has short circuit / overload / overvoltage / overtemperature protection, and the output efficiency is as high as 90%.

[0041] The preferred embodiment of the lithium battery test equipment line sequence detection method comprises the following steps:

[0042] Step S1, the multi-channel switching board, the single-channel switching board, the positive copper bar and the negative copper bar of the line sequence detection device are placed on the needle bed tray of the lithium battery test equipment, the positive probes and the negative probes of the lithium battery test equipment are respectively pressed on the positive copper bar and the negative copper bar, and the power line and the voltage acquisition board of the DCDC power supply are connected to the positive probe and the negative probe.

[0043] Step S2, the host computer controls the single-chip microcomputer to output 3.3V voltage, and sequentially sends the 3.3V voltage to the positive copper bar and the negative copper bar through the multi-channel switching board and the single-channel switching board, and the host computer collects the first voltage value of the positive probe and the negative probe through the DCDC power supply, and detects the wiring of the DCDC power supply power line based on the deviation value of the first voltage value and 3.3V, that is, whether the deviation value is within the preset deviation range.

[0044] Step S3, the host computer controls the single-chip microcomputer to output 3.3V voltage, and the 3.3V voltage is connected to the adjacent two single-channel switching boards through the multi-channel switching board, the second voltage value of the single-channel switching board corresponding to the positive probe and the negative probe is collected through the voltage acquisition board, and the wiring of the series power line of the adjacent channel is detected based on the deviation value of the second voltage value and 3.3V, that is, whether the deviation value is within the preset deviation range.

[0045] Step S4, the host computer controls the single-chip microcomputer to output 3.3V voltage, and the 3.3V voltage is connected to all single-channel switching boards through the multi-channel switching board, and the third voltage value of each channel is sequentially collected through the voltage acquisition board, and the line sequence of each voltage sampling line of the voltage acquisition board is detected based on the deviation value of each third voltage value and 3.3V, that is, whether the deviation value is within the preset deviation range.

[0046] Step S5, the host computer controls the output voltage of the DCDC power supply to be the number of channels*0.5V, the fourth voltage value of each channel is collected through the voltage collection board, and whether the connection of the voltage sampling lines of each channel is short-circuited is detected based on the deviation value of each fourth voltage value and 0.5V, that is, whether the deviation value is within the preset deviation range is judged.

[0047] Step S6, the host computer connects each channel in series through each single-channel switching board, controls the DCDC power supply to output a current of 100A, collects the fifth voltage value of each channel through the voltage collection board, calculates the voltage difference based on the fifth voltage value of each channel, divides the voltage difference by the current to calculate the power line resistance value, the probe contact resistance value and the probe resistance value, and further detects whether the connection is reliable, that is, whether the power line resistance value, the probe contact resistance value and the probe resistance value are within the preset value range.

[0048] Step S7, the positive and negative probes are separated, the host computer controls the output voltage of the DCDC power supply to be the number of channels*0.5V, the sixth voltage value of each channel is collected through the voltage collection board, and whether the connection of the voltage sampling lines of each channel is mutually adjusted is detected based on the deviation value of each sixth voltage value and 0.5V, that is, whether the deviation value is within the preset deviation range is judged.

[0049] In summary, the advantages of the present application are:

[0050] By setting the host computer, the voltage collection board, the DCDC power supply, the single-chip microcomputer, the multi-channel switching board, the single-channel switching board, the positive copper bar, the negative copper bar and the power module, the host computer is connected with the voltage collection board, the DCDC power supply and the single-chip microcomputer, one end of the multi-channel switching board is connected with the single-channel switching board, the other end is connected with the single-chip microcomputer, the single-channel switching board is connected with the positive copper bar and the negative copper bar respectively, and the power module is connected with the single-chip microcomputer; when the lithium battery test equipment is detected, the positive and negative probes of the corresponding channel are pressed on the positive and negative copper bars respectively, the host computer controls the single-chip microcomputer to output voltage, switches the channels through the multi-channel switching board, collects the voltage value output by each channel through the voltage collection board and the DCDC power supply, and based on the deviation of the output voltage value and the actual setting value and the power line resistance value, the probe contact resistance value and the probe resistance value calculated based on the voltage value, the connection of the DCDC power line, the connection of the series power line of adjacent channels, the line sequence of the voltage sampling lines of the voltage collection board, whether the connection of the voltage sampling lines of each channel is short-circuited, whether the connection is reliable, and whether the connection of the voltage sampling lines of each channel is mutually adjusted can be automatically detected, without manually holding a multimeter for detection as in the traditional way, and the efficiency and comprehensiveness of the lithium battery test equipment line sequence detection are greatly improved.

[0051] While the foregoing description has described specific embodiments of the application, one ordinary skill in the art will appreciate that various modifications and changes can be made thereto without departing from the spirit and scope of the application, as set forth in the appended claims.

Claims

1. A method for detecting the line sequence of a lithium battery testing device, characterized in that: The method requires the use of a lithium battery testing equipment line sequence detection device, including a host computer, a voltage acquisition board, a DC-DC power supply, a microcontroller, a multi-channel switching board, several single-channel switching boards, several positive copper busbars, several negative copper busbars, and a power module. The host computer is connected to the voltage acquisition board, the DC-DC power supply, and the microcontroller; one end of the multi-channel switching board is connected to the single-channel switching board, and the other end is connected to the microcontroller; the single-channel switching board is connected to the positive copper busbar and the negative copper busbar, and is located between the positive copper busbar and the negative copper busbar; the power module is connected to the microcontroller. The single-channel switching board includes a MOSFET Q1, a MOSFET Q2, a MOSFET Q3, and a MOSFET Q4; The drain (D) of MOSFET Q1 is connected to the drain (D) of MOSFET Q2 and the positive copper busbar, and the gate (G) is connected to the gate (G) of MOSFET Q2 and the multi-channel switching board. The drain (D) of MOSFET Q3 is connected to the drain (D) of MOSFET Q4 and the negative copper busbar, and the gate (G) is connected to the gate (G) of MOSFET Q4 and the multi-channel switching board. The multi-channel switching board includes several single-channel switching boards; The drain (D) of MOS transistor Q1 in the multi-channel switching board is connected to the drain (D) of MOS transistor Q2 and the single-channel switching board, and the gate (G) is connected to the gate (G) of MOS transistor Q2 and the microcontroller. The drain (D) of MOS transistor Q3 in the multi-channel switching board is connected to the drain (D) of MOS transistor Q4 and the single-channel switching board, and the gate (G) is connected to the gate (G) of MOS transistor Q4 and the microcontroller. The microcontroller is an STM32F429. The power module is model LRS-150-24V; The method includes the following steps: Step S1: Place the multi-channel switching board, single-channel switching board, positive copper busbar, and negative copper busbar of the line sequence detection device on the needle bed tray of the lithium battery testing equipment. Press each positive and negative probe of the lithium battery testing equipment onto the positive and negative copper busbars respectively. Connect the power line and voltage acquisition board of the DCDC power supply to the positive and negative probes. Step S2: The host computer controls the microcontroller to output a 3.3V voltage, which is then transmitted to the positive and negative copper busbars sequentially through a multi-channel switching board and a single-channel switching board. The host computer collects the first voltage values ​​of the positive and negative probes through the DC-DC power supply and detects the wiring of the DC-DC power supply lines based on the deviation between the first voltage value and 3.3V. Step S3: The host computer controls the microcontroller to output a 3.3V voltage. The 3.3V voltage is transferred to two adjacent single-channel switching boards through the multi-channel switching board. The voltage acquisition board collects the second voltage values ​​of the corresponding positive and negative probes of the single-channel switching board. Based on the deviation value between the second voltage value and 3.3V, the connection of the series power line of the adjacent channel is detected. Step S4: The host computer controls the microcontroller to output a 3.3V voltage. The 3.3V voltage is transferred to all single-channel switching boards through the multi-channel switching board. The voltage acquisition board sequentially acquires the third voltage value of each channel. Based on the deviation value of each third voltage value from 3.3V, the line sequence of each voltage sampling line of the voltage acquisition board is detected. Step S5: The host computer controls the output voltage of the DC-DC power supply to be the number of channels * 0.5V. The fourth voltage value of each channel is collected by the voltage acquisition board. Based on the deviation of each fourth voltage value from 0.5V, the connection of the voltage sampling lines of each channel is checked for short circuits. Step S6: The host computer connects each channel in series through each single-channel switching board, controls the DC-DC power supply to output a current of 100A, collects the fifth voltage value of each channel through the voltage acquisition board, calculates the voltage difference based on the fifth voltage value of each channel, divides the voltage difference by the current to calculate the power line resistance, probe contact resistance, and probe resistance, and then checks whether the wiring is secure. Step S7: Disconnect the positive and negative probes from the circuit. The host computer controls the output voltage of the DC-DC power supply to be the number of channels * 0.5V. The sixth voltage value of each channel is collected by the voltage acquisition board. Based on the deviation of each sixth voltage value from 0.5V, the wiring of the voltage sampling lines of each channel is checked to see if they are interchanged.

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