BMU automatic testing machine and testing method

Abstract

The invention discloses a BMU automatic testing machine and a testing method.The BMU automatic testing machine comprises a testing table, the testing table is composed of a frame and a table top, the table top is fixed to the middle of an inner cavity of the frame, a back plate is fixed to the upper side of the back face of the table frame, a mechanical arm is fixed to the position, close to the back plate, of the top of the table top, and an upper computer is fixed to the back plate; a defective product tray and a to-be-tested product tray are arranged on one side of the top of the table top, a good product tray is arranged on the other side of the top of the table top, and testing jigs are fixed to the two sides of the middle of the top of the table top. The test mainboard is in software communication with the upper computer, the upper computer controls machinery and sensors to operate, controls equipment such as a mechanical arm, a tray, a suction cup, an image sensor and a jig to realize automatic detection, records the ID number of the tested BMU and the measured voltage precision, balance function and temperature acquisition data, counts the yield of each batch, and determines the quality of the BMU. Therefore, the detection equipment has the advantages of low cost, high safety, high data traceability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of thin-walled parts processing, in particular to a BMU automatic testing machine and a testing method. Background Art

[0002] The battery sampling management module (BMU) is an important hardware component of the battery management system (BMS) for collecting the voltage and temperature information of the single cell. The BMU monitors the voltage and temperature of the single cell and uploads the information to the BMS to achieve safe, stable and reliable operation of the lithium battery pack. Therefore, the detection of the BMU is crucial to the safe and stable operation of the battery module.

[0003] With the gradual application of lithium-ion battery packs, the production capacity of battery sampling management modules has increased rapidly, but there are relatively few devices for BMU testing, and most of them are manually operated. In the prior art, the performance test of BMU is generally performed by simulating battery cell equipment, setting a fixed output voltage on the simulated battery cell equipment, and then using the BMU module to be tested to measure the voltage of the simulated battery cell. The host computer collects data and compares the difference to determine whether the test is passed. However, the simulation battery cell equipment is very expensive, the cost is high, and it is inconvenient to operate;

[0004] Therefore, we propose a BMU automatic testing machine and testing method. Summary of the invention

[0005] The purpose of the present invention is to provide a BMU automatic testing machine and a testing method, which solve the problems raised in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a BMU automatic test machine, comprising a test bench, the test bench consisting of a frame and a table top, the table top is fixed in the middle of the inner cavity of the frame, a back plate is fixed on the upper side of the back of the table frame, a mechanical arm is fixed on the top of the table top near the back plate, and a host computer is fixed on the back plate;

[0007] A defective product tray and a test product tray are arranged on one side of the table top, a good product tray is arranged on the other side of the table top, and test fixtures are fixed on both sides of the middle of the table top.

[0008] In actual use, the robotic arm grabs the circuit board on the test product tray, and then moves to the test fixture under the control of the host computer, places the circuit board in the test fixture, so that the circuit board and the detection block are in contact, thereby realizing the circuit board detection. After the detection is completed, the detection data will be transmitted to the host computer for storage, and the host computer will identify whether the circuit board is qualified. Then the robotic arm will classify the detected circuit boards and store them on the good product tray and the defective product tray.

[0009] As a preferred embodiment of the present invention, a suction cup is fixed to the outer end of the robot arm, and the setting of the suction cup enables the circuit board to be adsorbed, thereby achieving grasping, and the circuit board can be released when the suction cup is depressurized.

[0010] As a preferred embodiment of the present invention, a high-precision camera is fixed to one side of the outer end of the robotic arm, and the signal output end of the high-precision camera is connected to the signal input end of the host computer. The high-precision camera can capture images of the circuit board and feed them back to the host computer to detect whether the circuit board is damaged. At the same time, the image of the circuit board transfer position can also be calibrated to ensure the accuracy of the circuit board transfer position.

[0011] As a preferred embodiment of the present invention, a control box is fixed to the inner cavity at the lower side of the frame, an emergency stop button is fixed to the outer wall of the control box, and the emergency stop button on the control box is connected to the signal of the host computer, so that one-button stop can be achieved in an emergency.

[0012] As a preferred embodiment of the present invention, gratings are fixed on the four side walls of the frame inner cavity, and the signal output end of the grating is connected to the signal input end of the host computer. The setting of the grating can protect the detection operation area. When the grating is triggered by a staff member or an object, a signal will be fed back to the host computer, thereby stopping the operation and avoiding danger.

[0013] The present invention also relates to a BMU automatic testing method, comprising the following method steps:

[0014] Step 1: The operator sets the standard values ​​of voltage and temperature in the host computer and transmits them to the test mainboard;

[0015] Step 2: The operator places the tray of the product to be tested together with the circuit board at the designated position on the top of the table;

[0016] Step 3: The robot arm grabs the circuit boards from the tray one by one and places them on the test fixture;

[0017] Step 4: The host computer starts the detection program, the mainboard collects voltage and temperature data and compares them with standard values, the host computer receives the data and comparison results, analyzes and judges them, and records the results in an Excel file;

[0018] Step 5: According to the test results, the robot arm classifies the circuit boards and moves them into qualified trays or unqualified trays;

[0019] Step 6: When the qualified tray or unqualified tray is full, the operator is responsible for removing it and replacing it with an empty tray.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The test mainboard of this device communicates with the computer host software. The computer host controls the operation of the machinery and sensors, controls the robotic arms, trays, suction cups, image sensors, fixtures and other equipment to realize automatic detection, and records the ID number of the BMU being tested and the measured voltage accuracy, balancing function, temperature collection data, and statistics the yield rate of each batch, the distribution of defective products and other data, thereby achieving the advantages of low cost, good safety, high automation, and good data traceability of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 This is an operation diagram of a BMU automatic testing machine and a testing method of the present invention;

[0024] Figure 2 The present invention provides a test principle diagram of a BMU automatic test machine and a test method.

[0025] In the picture

[0026] 1. Test bench; 2. Control box; 3. Emergency stop button; 4. Good product tray; 5. Grating; 6. Test fixture; 7. Robotic arm; 8. Host computer; 9. Suction cup; 10. High-precision camera; 11. Bad product tray; 12. Test product tray. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] Example

[0029] See also Figure 1 A BMU automatic test machine includes a test table 1, the test table 1 is composed of a frame and a table top, the table top is fixed in the middle of the inner cavity of the frame, a back plate is fixed on the upper side of the back of the table frame 1, a mechanical arm 7 is fixed on the top of the table top near the back plate, and a host computer 8 is fixed on the back plate;

[0030] A defective product tray 11 and a test product tray 12 are arranged on one side of the top of the table, a good product tray 4 is arranged on the other side of the top of the table, and a test fixture 6 is fixed on both sides of the middle of the top of the table;

[0031] The test fixture 6 includes a fixed shell and a test mainboard, the test mainboard is fixed in the inner cavity of the fixed shell and connected to the host computer 8 through a data line, and a detection block is fixed on the fixed shell, and the detection block passes through the fixed shell and is connected to the test mainboard;

[0032] Among them, the signal output end of the test mainboard is connected to the signal input end of the host computer 8, and the signal output end of the host computer 8 is connected to the signal input end of the robot arm 7;

[0033] In actual use, the robot arm 7 grabs the circuit board on the test product tray 12, and then moves to the test fixture under the control of the host computer 8, and places the circuit board in the test fixture so that the circuit board and the detection block are in contact, thereby realizing the circuit board detection. After the detection is completed, the detection data will be transmitted to the host computer 8 for storage, and the host computer 8 will determine whether the circuit board is qualified, and then the robot arm 7 will classify the detected circuit boards and store them on the good product tray 4 and the defective product tray 11.

[0034] Furthermore, a suction cup 9 is fixed to the outer end of the robot arm 7. The setting of the suction cup 9 enables the circuit board to be adsorbed, thereby achieving grasping, and the circuit board can be released when the suction cup 9 is depressurized.

[0035] Furthermore, a high-precision camera 10 is fixed to one side of the outer end of the robot arm 7, and the signal output end of the high-precision camera 10 is connected to the signal input end of the host computer 8. The high-precision camera 10 can capture images of the circuit board and feed them back to the host computer 8, so as to detect whether the circuit board is damaged. At the same time, the circuit board transfer position image can also be calibrated to ensure the accuracy of the circuit board transfer position.

[0036] It is worth mentioning that gratings 5 ​​are fixed on the four side walls of the frame inner cavity. The signal output end of the grating 5 is connected to the signal input end of the host computer 8. The setting of the grating 5 can protect the detection operation area. When the grating 5 is triggered by a staff member or an object, a signal will be fed back to the host computer 8, thereby stopping the operation and avoiding danger.

[0037] It should be noted that a control box 2 is fixed to the inner cavity at the lower side of the frame, an emergency stop button 3 is fixed to the outer wall of the control box 2, and the emergency stop button 3 on the control box 2 is connected to the signal of the host computer 8, so that one-button stop can be achieved in an emergency.

[0038] In this embodiment, Figure 2 As shown, resistor voltage division is used to simulate the battery, and the change of resistance value of parallel resistors is used to simulate temperature change. R1 to R12 are BMU balancing resistors, R13 to R24 are battery simulation resistors, R25 to R28 are temperature simulation resistors, K1 to K12 are BMU internal balancing control switches, K13 to K14 are temperature resistor parallel switches, and DC is a high-precision programmable DC power supply.

[0039] Voltage acquisition accuracy test: As shown in the test principle diagram, R13 to R24 are high-precision low-temperature floating resistors. 12 resistors are connected in series. The host computer 8 sets the DC voltage. According to the resistance value of each resistor, the voltage of the corresponding resistor is calculated. The BMU board collects the voltage across the corresponding resistor and sends the data to the host computer 8 through the test motherboard. The host computer 8 compares the test value with the theoretical value, sets multiple voltages through the DC power supply, and realizes BMU multi-voltage test.

[0040] BMU balancing function test: The BMU test board sends a balancing command 1 to turn on the switches of the odd channels, R1, R3...R11. At this time, the equivalent resistance of R1 and R13 in parallel...R11 and R23 in parallel is reduced, and the voltage divided across R1, R3...R11 is reduced. The data is sent to the host computer 8 through the test main board; then a balancing command 2 is sent to turn on the even channels and measure the other half of the data. The host computer 8 determines the balancing start information by comparing the changes in the collected voltage values ​​and obtains this test result.

[0041] For temperature detection, R25 and R27 use 100KΩ high-precision resistors to simulate a temperature of 25°C. The data is sent to the host computer through the BMU test board. The BMU test board then controls K13 and K14 to be closed, so that R25 and R26 are connected in parallel, and the resistance value changes to simulate another temperature. The test motherboard sends the data to the host computer 8. The host computer 8 compares it with the theoretical value to determine the temperature sampling accuracy and obtain the test result.

[0042] A BMU automatic testing method is as follows:

[0043] Step 1: The operator sets the standard values ​​of voltage and temperature in the host computer 8 and transmits them to the test mainboard;

[0044] Step 2: The operator places the test product tray 12 together with the circuit board on the designated position on the top of the table;

[0045] Step 3: The robot arm 7 grabs the circuit boards from the tray one by one and places them on the test fixture 6;

[0046] Step 4: The host computer 8 starts the detection program, the mainboard collects voltage and temperature data and compares them with standard values, the host computer 8 receives the data and the comparison results, analyzes and judges them, and records the results in an Excel file;

[0047] Step 5: According to the test results, the robot arm 7 classifies the circuit boards and moves them into a qualified tray or a failed tray;

[0048] Step 6: When the qualified tray or unqualified tray is full, the operator is responsible for removing it and replacing it with an empty tray.

[0049] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A BMU automatic testing machine, Features: The test bench (1) comprises a frame and a table top, the table top is fixed in the middle of the inner cavity of the frame, a back plate is fixed on the upper back side of the table frame (1), a mechanical arm (7) is fixed on the top of the table top near the back plate, and a host computer (8) is fixed on the back plate; A defective product tray (11) and a test product tray (12) are arranged on one side of the table top, a good product tray (4) is arranged on the other side of the table top, and test fixtures (6) are fixed on both sides of the middle of the table top.

2. A BMU automatic testing machine according to claim 1, Features: A suction cup (9) is fixed to the outer end of the mechanical arm (7).

3. A BMU automatic testing machine according to claim 1, Features: A high-precision camera (10) is fixed to one side of the outer end of the mechanical arm (7).

4. A BMU automatic testing machine according to claim 1, Features: A control box (2) is fixed to the inner cavity at the lower side of the frame, and an emergency stop button (3) is fixed to the outer wall of the control box (2).

5. A BMU automatic testing machine according to claim 1, Features: Gratings (5) are fixed on the four side walls of the inner cavity of the frame.

6. A BMU automatic testing method, applicable to the BMU automatic testing machine according to claims 1-5, Features: The method comprises the following steps: Step 1: The operator sets the standard values ​​of voltage and temperature in the host computer 8 and transmits them to the test mainboard; Step 2: The operator places the test product tray 12 together with the circuit board on the designated position on the top of the table; Step 3: The robot arm 7 grabs the circuit boards from the tray one by one and places them on the test fixture 6; Step 4: The host computer 8 starts the detection program, the mainboard collects voltage and temperature data and compares them with standard values, the host computer 8 receives the data and the comparison results, analyzes and judges them, and records the results in an Excel file; Step 5: According to the test results, the robot arm 7 classifies the circuit boards and moves them into qualified trays or unqualified trays; Step 6: When the qualified tray or unqualified tray is full, the operator is responsible for removing it and replacing it with an empty tray.

Images