Charger and battery pack charging and discharging measuring device and testing method thereof

Abstract

A charging and discharging measuring device for a charger and a battery pack comprises a host cabinet, a multifunctional instrument area, a touch control area, a control switchboard area and a load system, the load system comprises a load capacitor, a plurality of groups of automatic resistance value adjusting mechanisms and a stepping driving mechanism which are connected in sequence, and a stepping motor simulating a finished vehicle is arranged in the stepping driving mechanism; the multifunctional instrument area comprises a battery pack parameter measuring module, a charger parameter measuring module, a load parameter measuring module, a socket and a charging inlet, and the control switchboard area comprises a programmable logic controller (PLC), an expansion module, a communication module, a stepping driver and a control switch group. The PLC, the expansion module and the stepping driver are sequentially connected, the stepping driver is connected with a load system, and the communication module is connected with a battery pack parameter measurement module, a charger parameter measurement module and a load parameter measurement module. And the communication module is used for transmitting measurement parameters of the battery pack, the charger and the load system to the PLC.

Description

Technical Field

[0001] The present invention relates to the field of charger and battery pack measurement, and in particular to a charger and battery pack charge and discharge measurement device and a test method thereof. Background Art

[0002] At this stage, electric motorcycles are the development focus of new energy motorcycles, and the power battery in electric motorcycles is the core component of electric motorcycles. Its performance testing is the top priority of the entire electric motorcycle.

[0003] In the existing power battery performance test: the first solution is to use timed and quantitative repeated charge and discharge measurements of the power battery to obtain the corresponding performance parameters. The second solution is to let the whole vehicle drive on the actual road, with a certain time or mileage as a test cycle. The disadvantage of solution one is that the timed and quantitative repeated charge and discharge test does not conform to the actual working current data of the motorcycle during driving, and the charging does not conform to the charging curve of the actual charger, which is out of touch with reality. The disadvantage of solution two is that when testing the actual road driving of the whole vehicle, the test cycle is long and is easily affected by environmental factors such as actual road conditions. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a charger and a battery pack charge and discharge measurement device and a test method thereof: A charging and discharging measuring device for a charger and a battery pack, comprising a host cabinet, a multi-function instrument area, a touch area, a control switchboard area, and a load system, wherein the load system comprises sequentially connected load capacitors, multiple groups of automatic resistance value adjustment mechanisms, and a stepping drive mechanism, wherein the stepping drive mechanism is built with a stepping motor simulating a vehicle; The multifunctional instrument area includes a battery pack parameter measurement module, a charger parameter measurement module, a load parameter measurement module, a socket and a charging inlet, wherein the socket is used for power supply of the charger, and the charging inlet is used for current input of the charger; the battery pack parameter measurement module is used for detecting various parameters of the battery pack, the charger parameter measurement module is used for detecting various parameters of the charger, and the load parameter measurement module is used for measuring various parameters of the load system; The control distribution panel area includes a programmable controller PLC and an expansion module, a communication module, a stepper driver and a control switch group. The expansion module and the communication module are both connected to the programmable controller PLC. The control switch group includes a first contactor, a second contactor, and a third contactor connected in sequence; the first contactor, the second contactor, and the third contactor are all connected to the programmable controller PLC, the first contactor is connected to a battery pack, the second contactor is connected to a charger through a charging inlet, and the third contactor is connected to a load capacitor. The programmable controller PLC, the expansion module, and the stepper driver are connected in sequence, the stepper driver is connected to a load system, the communication module is respectively connected to a battery pack parameter measurement module, a charger parameter measurement module, and a load parameter measurement module, and the communication module is used to transmit the measurement parameters of the battery pack, the charger, and the load system to the programmable controller PLC.

[0005] Preferably, it also includes a touch area connected to the control distribution panel area, the touch area includes a touch screen, indicator lights and buttons all connected to the programmable controller PLC, the touch screen is used to control the programmable controller PLC and display various parameters, the indicator lights are used to issue an alarm when the measured parameters are abnormal, and the buttons are physical keys connected to the touch screen.

[0006] Preferably, the multiple groups of automatic resistance value adjustment mechanisms include multiple groups of adjustable resistors with different resistance values ​​and powers, and the multiple groups of automatic resistance value adjustment mechanisms are installed in a lower box cabinet provided at the bottom of the host cabinet. The adjustable resistors are connected to a programmable controller PLC, and the programmable controller PLC controls the resistance value of the adjustable resistors.

[0007] Preferably, the adjustable resistor includes a resistor body, a dedicated slide, a positive sliding contact and a sliding contact driving seat, the lower end of the resistor body is electrically connected to a corresponding stepping motor, the resistor body and the dedicated slide table correspond to each other, the resistor body and the positive sliding contact are electrically connected to each other by relative sliding, the positive sliding contact is used to control the resistance value of the adjustable resistor, the positive sliding contact and the sliding contact driving seat are fixedly connected to each other, the sliding contact driving seat and the dedicated slide table form a guide rail, and the sliding contact driving seat is used to manually control the position of the positive sliding contact on the resistor body.

[0008] Preferably, the battery pack parameter measurement module includes a first voltmeter, a first ammeter, a first pressure sensor and a first temperature sensor. The first voltmeter and the first ammeter are electrically connected to the battery pack. The first voltmeter is used to detect the voltage value of the battery pack in real time. The first ammeter is used to detect the current value of the battery pack in real time. The first pressure sensor is arranged on the surface of the battery pack for detecting in real time whether the battery pack has bulging and the time-pressure curve of the bulging. The first temperature sensor is installed on the battery pack for detecting the temperature value of the battery pack.

[0009] Preferably, the load parameter measurement module includes a second voltmeter, a second ammeter, a second humidity sensor and a second temperature sensor, the second voltmeter and the second ammeter are both electrically connected to multiple groups of automatic resistance value adjustment mechanisms, the second voltmeter is used to detect the voltage values ​​of the multiple groups of automatic resistance value adjustment mechanisms in real time, the second ammeter is used to detect the current values ​​of the multiple groups of automatic resistance value adjustment mechanisms in real time, the second humidity sensor and the second temperature sensor are both arranged in the lower cabinet, the second humidity sensor is used to detect the ambient humidity of the multiple groups of automatic resistance value adjustment mechanisms in the cabinet in real time, and the second temperature sensor is used to detect the temperature values ​​of the multiple groups of automatic resistance value adjustment mechanisms in the cabinet.

[0010] Preferably, the charger parameter measurement module includes a third temperature sensor, and the third temperature sensor is arranged on the surface of the charger to detect the temperature value of the charger in real time.

[0011] Preferably, the control distribution panel area includes a three-color light for alarm, and the three-color light is arranged at the upper end of the host cabinet. The multi-function instrument area includes an operation indicator light, and the first voltmeter, the first ammeter, the operation indicator light, the socket, and the charging inlet are arranged on the front of the device.

[0012] A test method for a charger and a battery pack charge and discharge measurement device, comprising the following steps: S1: When conducting a durability test on the charger, insert the charger input plug into the controller control socket, insert the charger output plug into the charging port, and bind the third temperature sensor to the charger; connect the battery pack corresponding to the charger to the device, and install the first pressure sensor and the first temperature sensor on the battery pack to monitor the temperature rise of the charger and the battery pack and alarm for high temperature shutdown during the test, and detect whether the battery pack has bulging during the test through the first pressure sensor, and generate a time-pressure curve when bulging starts; S2: Turn on the main power of the device, the device enters the standby state, click to enter the touch screen setting screen, set the maximum voltage and maximum current value of this charger, the number of tests, the single test time, the maximum discharge current value of the battery pack, and the limit discharge voltage of the battery pack; S3: Charger charging the battery pack: After all parameters are set, enter the curve data page on the touch screen homepage, press the start button to start, and the device will run regularly according to the set program; the socket is powered on, and the programmable controller PLC is on standby; the program enters the battery pack charging state, the first and second contactors are opened, and the third contactor is disconnected, and the charger directly charges the battery pack. The programmable controller PLC determines whether the charging process is normal through the received voltage, current, pressure, and temperature data. If there is an abnormality such as excessive temperature, abnormal voltage and current fluctuations, the device will stop and alarm; S4: Battery pack discharge: When the battery pack is fully charged, the charging current is close to 0A, the socket is powered off and the charging inlet is disconnected, and after waiting for the specified cooling time, the battery pack begins the discharge test, the third contactor is also opened, and the battery pack begins to discharge the load system. The discharge mode is simulated in the state of the vehicle, and the current size will change continuously; the change of the discharge current is controlled by the programmable controller PLC through the stepper driver to switch multiple groups of different adjustable resistors to simulate the vehicle environment. The stepper driver drives the stepper motor to drive and control the movement of the positive sliding contact on the special slide. Multiple groups of adjustable resistors change different load resistance values ​​through the control of the programmable controller PLC, corresponding to different discharge currents, and the S3-S4 steps are repeated. By continuously charging the battery pack with the charger, the battery pack discharges the load system and measures the relevant data, the durability test of the charger on the charger in the battery pack, the battery pack charging durability test and the battery pack discharge durability test can be carried out simultaneously; S5: Charger charging alone: ​​When testing the charger alone without testing the battery pack, disconnect the first contactor, open the second contactor and the third contactor, and the current output by the charger will start to charge the adjustable slide resistance through the load capacitor. The charging current decreases from large to small, and the current size is adjusted by the programmable controller PLC driving the stepper driver to drive the stepper motor to drive the movement of the positive sliding contact on the special slide. At this time, the third temperature sensor set on the charger can be used to achieve a separate durability test of the charger.

[0013] Beneficial effects: The device includes a host cabinet, a multi-functional instrument area, a touch screen, a programmable controller PLC, a control distribution panel area, and a load system; the device uses a programmable controller PLC and its expansion modules to control the operation of the device, control and summarize the test time, test steps, and test data of the charger. When the charger is inserted into the corresponding socket for experiment, the corresponding parameters are set in the touch screen, such as the maximum voltage and maximum current of the charger, the speed of change of the charging current value, etc.; after setting the corresponding data, press the start button, the device starts to run automatically, and runs automatically according to the set current size and time. The stepping mechanism drives the positive contact to slide from small to large on the adjustable resistor according to the set resistance value, and the resistance from large to small corresponds to the current from small to large; its limit range is determined by the parameters set in the touch screen.

[0014] This test bench uses a simulated vehicle to perform charging and discharging tests, which not only verifies the durability of the charger, but also tests the aging characteristics of the battery pack. The programmable controller PLC drives the stepper slide contact to adjust different resistance values, thereby generating different load currents. At the same time, various monitoring of temperature, pressure, voltage and current values ​​are also carried out. This electric vehicle charger and battery pack charging and discharging test bench can simultaneously perform durability aging tests on the charger and the matching battery pack. It can be used with the battery pack for comprehensive durability tests, or it can be used without the battery pack to perform a separate charger aging test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment.

[0016] Figure 2 This is a usage state diagram of an embodiment.

[0017] Figure 3 It is an internal schematic diagram of an embodiment.

[0018] Figure 4 It is a working principle diagram of an embodiment.

[0019] Description of the drawings: 1. Mainframe cabinet; 2. Multi-function instrument area; 201. Voltmeter; 202. Ammeter; 203. Operation indicator light; 204. Socket; 205. Charging inlet; 3. Touch area; 301. Touch screen; 302. Indicator light; 4. Control distribution panel area; 401. Three-color light; 402. Programmable controller PLC; 403. Extension module; 404. 485 communication module; 405. Stepper motor driver; 5. Multiple sets of automatic resistance value adjustment mechanisms; 501. Resistor; 502. Positive sliding contact; 503. Cooling fan; 504. Sliding contact drive seat; 505. Special slide; 506. Stepper motor; 6. Charger; 7. Battery pack. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-4 The present invention is further illustrated with examples.

[0021] Embodiment: A charging and discharging measuring device for a charger and a battery pack comprises a host cabinet 1, a multi-function instrument area 2, a touch area 3, a control distribution panel area 4, and a load system.

[0022] like Figure 2 and Figure 4 As shown, the load system includes a load capacitor, multiple groups of automatic resistance value adjustment mechanisms 5, and a stepping drive mechanism connected in sequence, and the stepping drive mechanism is built with a stepping motor 506 simulating a vehicle. The multiple groups of automatic resistance value adjustment mechanisms 5 include six groups of adjustable resistors with different resistance values ​​and powers, and the six groups of automatic resistance value adjustment mechanisms 5 are installed in the lower cabinet provided at the bottom of the host cabinet 1. The adjustable resistors are connected to the programmable controller PLC402, and the programmable controller PLC402 controls the resistance value of the adjustable resistors. The adjustable resistor includes a resistor body 501, a dedicated slide 505, a positive sliding contact 502 and a sliding contact driving seat 504. The lower end of the resistor body 501 is electrically connected to a corresponding stepping motor 506. The resistor body 501 and the dedicated slide 505 correspond to each other. The resistor body 501 and the positive sliding contact 502 are electrically connected to each other by relative sliding. The positive sliding contact 502 is used to control the resistance value of the adjustable resistor. The positive sliding contact 502 and the sliding contact driving seat 504 are fixedly connected to each other. The sliding contact driving seat 504 and the dedicated slide 505 form a guide rail. The sliding contact driving seat 504 is used to manually control the position of the positive sliding contact 502 on the resistor body 501.

[0023] like Figure 2As shown, the multifunctional instrument area 2 includes a battery pack parameter measurement module, a charger parameter measurement module, a load parameter measurement module, a socket 204 and a charging inlet 205. The socket 204 is used for power supply of the charger 6, and the charging inlet 205 is used for current input of the charger 6. The battery pack parameter measurement module is used to detect various parameters of the battery pack 7, the charger parameter measurement module is used to detect various parameters of the charger 6, and the load parameter measurement module is used to measure various parameters of the load system. The battery pack parameter measurement module includes a first voltmeter 201, a first ammeter 202, a first pressure sensor and a first temperature sensor. The first voltmeter 201 and the first ammeter 202 are electrically connected to the battery pack 7. The first voltmeter 201 is used to detect the voltage value of the battery pack 7 in real time. The first ammeter 202 is used to detect the current value of the battery pack 7 in real time. The first pressure sensor is arranged on the surface of the battery pack 7 to detect in real time whether the battery pack 7 has bulging and the time-pressure curve of the bulging. The first temperature sensor is installed on the battery pack 7 to detect the temperature value of the battery pack 7. The load parameter measurement module includes a second voltmeter 201, a second ammeter 202, a second humidity sensor and a second temperature sensor. The second voltmeter 201 and the second ammeter 202 are both electrically connected to the multiple groups of automatic resistance value adjustment mechanisms 5. The second voltmeter 201 is used to detect the voltage value of the multiple groups of automatic resistance value adjustment mechanisms 5 in real time. The second ammeter 202 is used to detect the current value of the multiple groups of automatic resistance value adjustment mechanisms 5 in real time. The second humidity sensor and the second temperature sensor are both arranged in the lower cabinet. The second humidity sensor is used to detect the ambient humidity of the multiple groups of automatic resistance value adjustment mechanisms 5 in the cabinet in real time. The second temperature sensor is used to detect the temperature value of the multiple groups of automatic resistance value adjustment mechanisms 5 in the cabinet. The charger parameter measurement module includes a third temperature sensor, which is arranged on the surface of the charger 6 and is used to detect the temperature value of the charger 6 in real time.

[0024] like Figure 2 As shown, the touch area 3 includes a touch screen 301, an indicator light 302 and a button, all of which are connected to the programmable controller PLC402. The touch screen 301 is used to control the programmable controller PLC402 and display various parameters. The indicator light 302 is used to issue an alarm when an abnormality occurs in the measured parameters. The button is a physical key connected to the touch screen 301.

[0025] like Figure 3As shown, the control distribution panel area 4 includes a programmable controller PLC402, an expansion module 403, a communication module, a stepper driver, a control switch group and a three-color light 401 for alarm. The expansion module 403 and the communication module are both connected to the programmable controller PLC402. The control switch group includes a first contactor, a second contactor, and a third contactor connected in sequence; the first contactor, the second contactor, and the third contactor are all connected to the programmable controller PLC402, the first contactor is connected to the battery pack 7, the second contactor is connected to the charger 6 through the charging inlet 205, and the third contactor is connected to the load capacitor. The programmable controller PLC402, the expansion module 403 and the stepper driver are connected in sequence, the stepper driver is connected to the load system, the communication module is respectively connected to the battery pack parameter measurement module, the charger parameter measurement module and the load parameter measurement module, and the communication module is used to transmit the measurement parameters of the battery pack 7, the charger 6, and the load system to the programmable controller PLC402. The three-color light 401 is arranged at the upper end of the host cabinet 1, the multifunctional instrument area 2 includes an operation indicator light 203, and the first voltmeter 201, the first ammeter 202, the operation indicator light 203, the socket 204, and the charging inlet 205 are arranged on the front of the device. The stepper motor used in this embodiment is a 57 stepper motor, and the communication module is a 485 communication module.

[0026] A test method for a charger and a battery pack charge and discharge measurement device, comprising the following steps: S1: When conducting a durability test on the charger 6, the power input plug of the charger 6 is inserted into the controller control socket 204, the power output plug of the charger 6 is inserted into the charging inlet 205, and the third temperature sensor is bound to the charger 6; the battery pack 7 corresponding to the charger 6 is connected to the device, and the first pressure sensor and the first temperature sensor are installed on the battery pack 7 to test the temperature rise monitoring and high temperature shutdown alarm of the charger 6 and the battery pack 7 during the test, and to detect whether the battery pack 7 has a bulging phenomenon during the test through the first pressure sensor, and generate a time-pressure curve when the bulging starts; S2: Turn on the main power of the device, turn on the device and enter the standby state, click to enter the setting screen of the touch screen 301, set the maximum voltage and maximum current value of the charger 6, the number of tests, the single test time, the maximum discharge current value of the battery pack 7, and the limit discharge voltage of the battery pack 7; S3: After all parameters are set, enter the homepage curve data page of the touch screen 301, press the start button to start, and the device will run regularly according to the set program; the socket 204 is powered on, and the programmable controller PLC402 is on standby; the program enters the charging state of the battery pack 7, the first contactor and the second contactor are opened, and the third contactor is disconnected, and the charger 6 directly charges the battery pack 7. The programmable controller PLC402 determines whether the charging process is normal through the received voltage, current, pressure, and temperature data. If there is an abnormality such as excessive temperature, abnormal voltage and current fluctuations, the device will stop and alarm.

[0027] S4: When the battery pack 7 is fully charged, the charging current is close to 0A, the socket 204 is powered off and the charging inlet 205 is disconnected. After waiting for the specified cooling time, the battery pack 7 starts the discharge test, the third contactor is also opened, and the battery pack 7 starts to discharge the load system. The discharge mode is simulated in the state of the vehicle, and the current size will change continuously; the change of the discharge current is controlled by the programmable controller PLC402 through the stepper driver to switch multiple groups of different adjustable resistors to simulate the vehicle environment. The stepper driver drives the stepper motor 506 to drive and control the positive sliding contact 502 on the special slide 505 to move. The 6 groups of resistors change different load resistance values ​​through the control of the programmable controller PLC402, corresponding to different discharge currents. Repeating the steps S3-S4, the battery pack 7 is continuously charged with the charger 6, and then the battery pack 7 is discharged to the load system and the relevant data is measured, so that the durability test of the charger 6 in the battery pack 7, the charging durability test of the battery pack 7 and the discharge durability test of the battery pack 7 can be carried out simultaneously.

[0028] S5: When testing the charger 6 alone without testing the battery pack 7, the first contactor is disconnected, and the second contactor and the third contactor are opened. The current output by the charger 6 passes through the load capacitor and starts to charge the adjustable slide resistance. The charging current decreases from large to small. The current size is adjusted by the programmable controller PLC402 driving the stepper driver 57 to drive the stepper motor 506 to drive the movement of the positive sliding contact 502 on the special slide 505. At this time, the third temperature sensor set on the charger 6 can be used to realize a separate durability test of the charger 6.

[0029] Obviously, the above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaust all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A charger and a battery pack charge and discharge measurement device, characterized in that: It comprises a mainframe cabinet (1), a multifunctional instrument area (2), a control switchboard area (4), and a load system, wherein the load system comprises sequentially connected load capacitors, multiple groups of automatic resistance value adjustment mechanisms (5), and a stepping drive mechanism, wherein the stepping drive mechanism has a built-in stepping motor (506) simulating a vehicle; The multifunctional instrument area (2) comprises a battery pack parameter measurement module, a charger parameter measurement module, a load parameter measurement module, a socket (204) and a charging inlet (205); the socket (204) is used for power supply of the charger (6), and the charging inlet (205) is used for current input of the charger (6); the battery pack parameter measurement module is used for detecting various parameters of the battery pack (7), the charger parameter measurement module is used for detecting various parameters of the charger (6), and the load parameter measurement module is used for measuring various parameters of the load system; The control distribution panel area (4) comprises a programmable controller PLC (402), an expansion module (403), a communication module, a stepper driver and a control switch group. The expansion module (403) and the communication module are both connected to the programmable controller PLC (402). The control switch group comprises a first contactor, a second contactor and a third contactor which are connected in sequence. The first contactor, the second contactor and the third contactor are all connected to the programmable controller PLC (402). The first contactor is connected to a battery pack (7). The second contactor is connected to a charger (6) via a charging inlet (205). The third contactor is connected to a load capacitor. The programmable controller PLC (402), the expansion module (403) and the stepper driver are connected in sequence. The stepper driver is connected to a load system. The communication module is respectively connected to a battery pack parameter measurement module, a charger parameter measurement module and a load parameter measurement module. The communication module is used to transmit measurement parameters of the battery pack (7), the charger (6) and the load system to the programmable controller PLC (402).

2. A charger and a battery pack charge and discharge measurement device according to claim 1, characterized in that: The invention also comprises a touch area (3) connected to the control panel area (4), wherein the touch area (3) comprises a touch screen (301), an indicator light (302) and a button, all of which are connected to a programmable controller PLC (402); the touch screen (301) is used to control the programmable controller PLC (402) and display various parameters; the indicator light (302) is used to issue an alarm when an abnormality occurs in the measured parameters; and the button is a physical key connected to the touch screen (301).

3. A charger and a battery pack charge and discharge measurement device according to claim 1, characterized in that: The multiple groups of automatic resistance value adjustment mechanisms include multiple groups of adjustable resistors with different resistance values ​​and powers. The multiple groups of automatic resistance value adjustment mechanisms are installed in a lower cabinet provided at the bottom of a host cabinet (1). The adjustable resistors are connected to a programmable controller PLC (402). The programmable controller PLC (402) controls the resistance values ​​of the adjustable resistors.

4. A charger and a battery pack charge and discharge measurement device according to claim 3, characterized in that: The adjustable resistor comprises a resistor body (501), a special slide table (505), a positive sliding contact (502) and a sliding contact driving seat (504); the lower end of the resistor body (501) is electrically connected to a corresponding stepping motor (506); the resistor body (501) and the special slide table (505) correspond to each other; the resistor body (501) and the positive sliding contact (502) are electrically connected by relative sliding; the positive sliding contact (502) is used to control the resistance value of the adjustable resistor; the positive sliding contact (502) and the sliding contact driving seat (504) are fixedly connected to each other; the sliding contact driving seat (504) and the special slide table (505) form a guide rail; and the sliding contact driving seat (504) is used to manually control the position of the positive sliding contact (502) on the resistor body (501).

5. A charger and a battery pack charge and discharge measurement device according to claim 4, characterized in that: The battery pack parameter measurement module comprises a first voltmeter (201), a first ammeter (202), a first pressure sensor and a first temperature sensor. The first voltmeter (201) and the first ammeter (202) are electrically connected to the battery pack (7). The first voltmeter (201) is used to detect the voltage value of the battery pack (7) in real time. The first ammeter (202) is used to detect the current value of the battery pack (7) in real time. The first pressure sensor is arranged on the surface of the battery pack (7) and is used to detect in real time whether the battery pack (7) has bulged and the time-pressure curve of the bulge. The first temperature sensor is installed on the battery pack (7) and is used to detect the temperature value of the battery pack (7).

6. A charger and a battery pack charge and discharge measurement device according to claim 5, characterized in that: The load parameter measurement module comprises a second voltmeter (201), a second ammeter (202), a second humidity sensor and a second temperature sensor. The second voltmeter (201) and the second ammeter (202) are both electrically connected to a plurality of groups of automatic resistance value adjustment mechanisms. The second voltmeter (201) is used to detect the voltage values ​​of the plurality of groups of automatic resistance value adjustment mechanisms in real time. The second ammeter (202) is used to detect the current values ​​of the plurality of groups of automatic resistance value adjustment mechanisms in real time. The second humidity sensor and the second temperature sensor are both arranged in the lower cabinet. The second humidity sensor is used to detect the ambient humidity of the plurality of groups of automatic resistance value adjustment mechanisms in the cabinet in real time. The second temperature sensor is used to detect the temperature values ​​of the plurality of groups of automatic resistance value adjustment mechanisms in the cabinet.

7. A charger and a battery pack charge and discharge measurement device according to claim 6, characterized in that: The charger parameter measurement module comprises a third temperature sensor, which is arranged on the surface of the charger (6) and is used to detect the temperature value of the charger (6) in real time.

8. A charger and a battery pack charge and discharge measurement device according to claim 5, characterized in that: The control distribution panel area (4) includes a three-color light (401) for alarming, and the three-color light (401) is arranged at the upper end of the host cabinet (1). The multifunctional instrument area (2) includes an operation indicator light (203), and the first voltmeter (201), the first ammeter (202), the operation indicator light (203), the socket (204), and the charging inlet (205) are arranged on the front of the device.

9. A test method using the charger and the charge and discharge measurement device of a battery pack according to any one of claims 7 to 8, comprising the following steps: S1: When conducting a durability test on the charger (6), the power input plug of the charger (6) is inserted into the controller control socket (204), the power output plug of the charger (6) is inserted into the charging inlet (205), and a third temperature sensor is bound to the charger (6); a battery pack (7) corresponding to the charger (6) is connected to the device, and a first pressure sensor and a first temperature sensor are installed on the battery pack (7) to monitor the temperature rise of the charger (6) and the battery pack (7) and to alarm for high temperature shutdown during the test, and to detect whether the battery pack (7) has a bulging phenomenon during the test by using the first pressure sensor, and to generate a time-pressure curve when the bulging starts; S2: Turn on the main power of the device, turn on the device and enter the standby state, click to enter the setting screen of the touch screen (301), set the maximum voltage and maximum current value of the charger (6), the number of tests, the single test time, the maximum discharge current value of the battery pack (7), and the limit discharge voltage of the battery pack (7); S3: The charger charges the battery pack: After all parameters are set, the touch screen (301) homepage curve data page is entered, and the start button is pressed to start the device. The device will run regularly according to the set program; the socket (204) is powered on, and the programmable controller PLC (402) is in standby mode; the program enters the state of charging the battery pack (7), the first contactor and the second contactor are opened, and the third contactor is disconnected, and the charger (6) directly charges the battery pack (7). The programmable controller PLC (402) determines whether the charging process is normal based on the received voltage, current, pressure, and temperature data. If there is an abnormality such as excessive temperature or abnormal voltage and current fluctuations, the device will shut down and alarm; S4: battery pack discharge: when the battery pack (7) is fully charged, the charging current is close to 0A, the socket (204) is powered off and the charging inlet (205) is disconnected, and after waiting for a specified cooling time, the battery pack (7) begins a discharge test, the third contactor is also opened, and the battery pack (7) begins to discharge the load system. The discharge mode is carried out in accordance with the state of the simulated vehicle, and the current size will change continuously; the change of the discharge current is controlled by the programmable controller PLC (402) through the stepper driver to switch multiple groups of different adjustable resistors to simulate the vehicle environment, and the stepper driver drives the stepper motor (506) to drive The positive sliding contact (502) on the special slide table (505) is controlled to move, and the six groups of adjustable resistors are controlled by a programmable controller PLC (402) to change different load resistance values ​​corresponding to different discharge currents. Steps S3-S4 are repeatedly performed to continuously charge the battery pack (7) with the charger (6), and then the battery pack (7) discharges the load system and measures relevant data, so that the durability test of the charger (6) on the battery pack (7), the charging durability test of the battery pack (7) and the discharging durability test of the battery pack (7) can be performed simultaneously; S5: Charging the charger alone: ​​When the charger (6) is tested alone without testing the battery pack (7), the first contactor is disconnected, and the second contactor and the third contactor are opened. The current output by the charger (6) passes through the load capacitor and starts to charge the adjustable slide resistance. The charging current is from large to small. The current size is adjusted by the programmable controller PLC (402) driving the stepper driver to drive the stepper motor (506) to drive the movement of the positive sliding contact (502) on the special slide (505). At this time, the charger (6) can be tested for durability alone through the third temperature sensor provided on the charger (6).

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