CN211741541U - High-voltage load test box - Google Patents
High-voltage load test box Download PDFInfo
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- CN211741541U CN211741541U CN201922284204.3U CN201922284204U CN211741541U CN 211741541 U CN211741541 U CN 211741541U CN 201922284204 U CN201922284204 U CN 201922284204U CN 211741541 U CN211741541 U CN 211741541U
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Abstract
The utility model discloses a high pressure load test box, include: the system comprises a microcontroller and a test module, wherein the microcontroller is respectively connected with the test module and an external battery management system and is used for receiving and processing data of the test module and the external battery management system; the test module comprises a total pressure detection module, an insulation resistance detection function test module, an overcurrent protection function test module, a temperature detection function test module and an SOC estimation function test module, wherein the total pressure detection module is used for collecting total pressure of the battery pack, the insulation resistance detection function test module is used for collecting insulation resistance of the battery pack, the overcurrent protection function test module is used for collecting voltage of the battery pack, the temperature detection function test module is used for collecting temperature of the battery pack, and the SOC estimation function test module is used for collecting SOC of the battery pack. This high pressure load test box detects multiple functional, full automatic operation, powerful and convenient to use.
Description
Technical Field
The utility model relates to a new energy automobile tests technical field, especially indicates a high pressure load test box.
Background
The existing high-voltage load test box product has single function and is usually used for realizing the test of a test item. In addition, in the actual use process, the test is completed in the form of manual wiring and an operation switch, which is very inconvenient. Therefore, a product with abundant functions and capable of carrying out automatic testing is urgently needed in the market.
SUMMERY OF THE UTILITY MODEL
The weak point to prior art, the utility model aims at providing a high pressure load test box, this high pressure load test box detects multiple functional, full automatic operation, powerful and convenient to use.
Based on the above-mentioned purpose, the utility model provides a pair of high-pressure load test box, include: the system comprises a microcontroller and a test module, wherein the microcontroller is respectively connected with the test module and an external battery management system and is used for receiving and processing data of the test module and the external battery management system;
the test module comprises a total pressure detection module, an insulation resistance detection function test module, an overcurrent protection function test module, a temperature detection function test module and an SOC estimation function test module, wherein the total pressure detection module is used for collecting total pressure of a battery pack, the insulation resistance detection function test module is used for collecting insulation resistance of the battery pack, the overcurrent protection function test module is used for collecting voltage of the battery pack, the temperature detection function test module is used for collecting temperature of the battery pack, and the SOC estimation function test module is used for collecting SOC of the battery pack.
In some embodiments of the present invention, the testing module further comprises a high-voltage output multi-path switching module for automatically switching the high-voltage signal output of the battery pack.
The utility model discloses an in some embodiments, total pressure detection module includes partial pressure unit and filtering unit, the one end and the high-pressure anodal of partial pressure unit are connected, the other end of partial pressure unit with filtering unit's one end is connected, filtering unit's the other end and high-pressure negative pole are connected.
In some embodiments of the present invention, the voltage dividing unit includes at least two first resistors having the same resistance value, and the filtering unit includes a capacitor and a second resistor connected in parallel with the capacitor.
In some embodiments of the present invention, the insulation resistance detection function test module includes two second resistors with the same resistance, and two of the second resistors are connected between the high-voltage anode and the high-voltage cathode.
In some embodiments of the present invention, the overcurrent protection function test module includes a third resistor, and the third resistor is connected between the high-voltage anode and the high-voltage cathode.
In some embodiments of the present invention, the temperature detection function test module includes a fourth resistor, and the fourth resistor is inserted into the NTC test circuit instead of the NTC thermistor.
In some embodiments of the present invention, the SOC estimation function detecting module includes a fifth resistor, and the fifth resistor is connected to the discharge test circuit.
The utility model discloses an in some embodiments, high voltage output multichannel switching module, insulation resistance detect functional test module overcurrent protection functional test module with temperature detects functional test module and all passes through relay control access's disconnection and closure.
In some embodiments of the present invention, the high voltage load testing box further comprises a display device, wherein the display device is connected to the microcontroller for displaying the processing result of the microcontroller.
From the above, compared with the prior art, the utility model has the following advantages:
the utility model discloses a high pressure load test box is used for testing new energy automobile's battery management system (BMS system), has integrateed the various functions of high pressure load test, can realize always pressing detection function test, insulation resistance detection function test, overcurrent protection function test, temperature detection function test and SOC (state of charge) estimation function test, and the function is abundant, and adopts automatic test mode, has improved efficiency of software testing and has avoidd the risk of artificial misoperation. The utility model discloses accomplished multiple test with one set of equipment, reduced the investment of experimental facilities, practiced thrift experimental facilities's area.
Drawings
Fig. 1 is a schematic structural view of a high-voltage load testing box according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a total pressure detection module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an insulation resistance detection function testing module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an overcurrent protection function test module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a temperature detection function testing module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an SOC estimation function testing module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a high-voltage output multi-path switching module according to an embodiment of the present invention;
the system comprises a microcontroller 1, a total pressure detection module 2, a voltage division unit 21 and a filtering unit 22, wherein the microcontroller is connected with the total pressure detection module 2; the device comprises a 3-insulation resistance detection function test module, a 4-overcurrent protection function test module, a 5-temperature detection function test module, a 6-SOC estimation function test module, a 7-high voltage output multi-path switching module and an 8-display device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe any more.
As shown in fig. 1, the present embodiment provides a high voltage load test box, including: the system comprises a microcontroller 1 and a test module, wherein the microcontroller 1 is respectively connected with the test module and an external battery management system and is used for receiving and processing data of the test module and the external battery management system;
the test module comprises a total pressure detection module 2, an insulation resistance detection function test module 3, an overcurrent protection function test module 4, a temperature detection function test module 5 and an SOC estimation function test module 6, wherein the total pressure detection module 2 is used for collecting total pressure of a battery pack, the insulation resistance detection function test module 3 is used for collecting insulation resistance of the battery pack, the overcurrent protection function test module 4 is used for collecting voltage of the battery pack, the temperature detection function test module 5 is used for collecting temperature of the battery pack, and the SOC estimation function test module 6 is used for collecting SOC of the battery pack.
The high-voltage load test box in the embodiment is used for testing the BMS system of the new energy automobile, integrates various functions of the high-voltage load test, and can realize total pressure detection function test, insulation resistance detection function test, overcurrent protection function test, temperature detection function test and SOC (state of charge) estimation function test so as to check whether various detection functions of the BMS system meet requirements. The method specifically comprises the following steps: total pressure detection module 2 obtains the total pressure value of battery package through high accuracy resistance measurement, and the BMS system also can measure the total pressure value that obtains the battery package, and microcontroller 1 receives total pressure detection module 2 respectively and the total pressure value of the battery package that the BMS system measurement obtained to compare total pressure value of both, whether normal with the total pressure detection function of judging the BMS system. Similarly, the microcontroller 1 receives the insulation resistance values measured by the insulation resistance detection function test module 3 and the BMS system, respectively, and compares the insulation resistance values of the two to determine whether the insulation resistance detection function of the BMS system is normal. The microcontroller 1 receives the voltage value measured by the overcurrent protection function testing module 4, and compares the voltage value with the total voltage value measured by the total voltage detecting module 2 to judge whether the overcurrent protection function of the BMS system is normal. The microcontroller 1 receives a temperature value measured by the BMS system and compares the temperature value with a fixed temperature value corresponding to the fixed resistor to determine whether the temperature detection function of the BMS system is normal. The microcontroller 1 respectively receives the SOC values measured by the SOC estimation function test module 6 and the BMS system, and compares the SOC values of the SOC estimation function test module and the BMS system to determine whether the SOC estimation function of the BMS system is normal.
Optionally, the microcontroller 1 is connected to an external BMS system through a CAN interface.
Optionally, the test module further includes a high-voltage output multi-path switching module 7 for automatically switching the high-voltage signal output of the battery pack, so as to facilitate external measurement. As shown in fig. 7, the high-voltage output multi-path switching module 7 switches the high-voltage signal output of the battery pack through the high-voltage relay, so that convenience is provided for the field test of a laboratory, and an automatic test mode is adopted, so that the test efficiency is improved, and the risk of manual misoperation is avoided.
As shown in fig. 2, the total pressure detection module 2 includes a voltage dividing unit 21 and a filtering unit 22, one end of the voltage dividing unit 21 is connected to the high-voltage positive electrode, the other end of the voltage dividing unit 21 is connected to one end of the filtering unit 22, and the other end of the filtering unit 22 is connected to the high-voltage negative electrode. Optionally, the voltage dividing unit 21 includes at least two first resistors with the same resistance value, the filtering unit 22 includes a capacitor and a second resistor connected in parallel with the capacitor, and the filtering unit 22 filters out specific band frequencies in the signal, so as to suppress and prevent interference.
In this embodiment, the total voltage of the battery pack is divided by the high-precision resistors, so the voltage dividing unit includes at least two first resistors having the same resistance value, for example, 6 first resistors, which are respectively the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5 and the resistor R6, where the resistance values are all 56K, and the capacitor has the characteristics of conducting alternating current and blocking direct current, when the total voltage detection module 2 detects, the capacitor C1 is conducting, and the alternating current cannot pass through the second resistor R19 connected in parallel with the capacitor C1, so the total voltage value of the battery pack can be obtained by AD sampling the voltage at both ends of any one of the first resistors and multiplying the voltage by the number of the first resistors.
In this embodiment, the port through THV (total voltage) is connected with the BMS system, and the total voltage value of the battery pack of the BMS system is read through the communication interface, and the microcontroller 1 receives the total voltage value of the battery pack measured by the total voltage detection module 2 and the total voltage value of the battery pack measured by the BMS system, and determines whether the total voltage detection function of the BMS system is normal by comparing the two total voltage values. If the deviation is 5%, the total pressure detection function of the BMS system is considered to be normal.
As shown in fig. 3, the insulation resistance detection function test module 3 includes two second resistors having the same resistance, and two second resistors are connected between the high-voltage positive electrode and the high-voltage negative electrode. Through artificially introducing high resistance value resistance between the grounding (negative electrode lead) and the battery pack, comparing with the measured value of the insulation resistance when the high resistance value resistance is not introduced, and checking whether the measured value of the insulation resistance of the BMS system meets the requirement or not. The method specifically comprises the following steps: two second resistors (R11 and R12 with the resistance values of 2M respectively) are connected between the high-voltage positive electrode and the high-voltage negative electrode, and grounding is connected between the two second resistors, and the opening and closing of the circuit are controlled through a relay K1 and a relay K2.
During testing, the relays K1 and K2 are firstly disconnected, insulation resistance values Rp1 and Rm1 of the battery pack are read through a CAN bus, the microcontroller 1 automatically calculates the insulation resistance values Rp2 and Rm2 after the relays K1 and K2 are attracted according to the Rp1 and the Rm1, then the relays K1 and K2 are closed, and the insulation resistance values Rp3 and Rm3 of the battery pack are read through the CAN bus. The microcontroller 1 receives insulation resistance values Rp3 and Rm3 measured by the BMS system, compares Rp2 and Rm2 with Rp3 and Rm3, and if the deviation is within 10%, and the high-voltage battery pack sends an alarm that the insulation resistance is low, the BMS system insulation resistance detection function is considered to be normal.
As shown in fig. 4, the overcurrent protection function test module 4 includes a third resistor (e.g., R22 or R21 with a resistance value of 15R), and the third resistor is connected between the high-voltage positive electrode and the high-voltage negative electrode. A high-power resistor with a smaller resistance value is connected in parallel between the high-voltage anode and the high-voltage cathode, so that the discharge current of the battery pack is larger than the maximum current value set by the BMS system but does not exceed the maximum discharge current of the battery pack. And detecting whether the overcurrent protection function of the BMS system is normal or not. The method specifically comprises the following steps: the opening and closing of the path is controlled by relay K3, the output of relay K3 is connected to microcontroller 1. And closing the relay K3, and connecting a high-power resistor (such as R22 or R21 with the resistance value of 15R) between the high-voltage positive electrode and the high-voltage negative electrode in parallel to discharge, wherein the discharge current exceeds the maximum discharge current value set by the BMS system, but is less than the maximum current value of safe discharge of the battery pack. After the interval of 0.1 second, the voltage value of the point M is sampled, and if the voltage value of the point M is less than 10% of the total voltage value measured by the total voltage detection module 2, the overcurrent protection function of the BMS system is considered to be normal.
As shown in fig. 5, the temperature detection function test module 5 includes a fourth resistor (e.g., a R37 resistor of 0 ohm or a R31 resistor of 10 kilo-ohms) incorporated into the NTC test circuit instead of the NTC thermistor. The battery pack temperature measurement in the BMS system adopts an NTC thermistor, and for testing whether the temperature detection function of the BMS system is normal or not, the external resistor with fixed resistance value is used for replacing the NTC thermistor, and the resistance value corresponds to a fixed temperature value. The opening and closing of the path is controlled by relay K4, the output of relay K4 is connected to microcontroller 1. After the resistance is connected, the relay K4 is closed, the temperature value measured by the BMS system is read through the CAN communication interface, the microcontroller 1 receives the total pressure value of the battery pack obtained by the measurement of the BMS system, and the deviation of the fixed temperature value corresponding to the measured temperature value and the resistance is compared to determine whether the temperature detection function of the BMS system meets the requirements or not.
Optionally, the NTC thermistor is replaced by a 0-ohm R37 resistor and a 10-kilohm R31 resistor, respectively, the temperature value of the battery pack of the BMS is read through the CAN bus, the microcontroller 1 receives the total pressure value of the battery pack measured by the BMS system, compares the measured temperature value with the temperature values corresponding to the 0-ohm R37 resistor and the 10-kilohm R31 resistor, and if the deviation is within the range of 1%, the temperature detection function of the BMS system is considered to be normal.
As shown in fig. 6, the SOC estimation function detection module 6 includes a fifth resistor, and the fifth resistor is connected to the discharge test circuit. The high-voltage battery pack is discharged through a high-power resistor (for example, a resistor R58 or a resistor R59 of 300 ohms), the SOC estimation function detection module 6 is used for measuring the SOC of the battery pack, the SOC value of the battery pack is read through a CAN bus, the microcontroller 1 receives the SOC value measured by the SOC estimation function detection module 6 and the SOC value measured by the BMS system, the SOC values of the SOC value and the SOC value are compared, and whether the SOC estimation function of the BMS system meets the requirement or not is judged.
In this embodiment, optionally, the microcontroller 1 compares the change rate of the SOC value in the unit time measured by the SOC estimation function detection module 6 with the change rate of the SOC value in the unit time measured by the BMS system to determine whether the SOC estimation function of the BMS system meets the requirement. Specifically, firstly, the SOC value of the battery pack is read through the CAN bus interface, the SOC value of the SOC estimation function detection module 6 in the high-voltage load test box is set as the SOC value, then the high-voltage battery pack is discharged through the high-power resistor, the SOC estimation function detection module 6 estimates the SOC value of the battery pack, the SOC value of the BMS is read through the CAN bus communication interface, the microcontroller 1 receives the SOC value measured by the SOC estimation function detection module 6 and the SOC value measured by the BMS system, calculates the change rate of the SOC value in the unit time measured by the SOC estimation function detection module 6 and the change rate of the SOC value in the unit time measured by the BMS system, compares the two values, and if the deviation is always kept within 2%, the SOC estimation function of the BMS system is considered to be normal.
In this embodiment, the high-voltage load testing box further includes a display device 8, the display device 8 is connected to the microcontroller 1 and is configured to display a processing result of the microcontroller 1, and optionally, the display device 8 may be a human-computer interface.
The high-voltage load test box of this embodiment is used for testing new energy automobile's BMS system, has integrateed high-voltage load test's various functions, can realize total pressure detection function test, insulation resistance detection function test, overcurrent protection function test, temperature detection function test and SOC estimation function test, and the function is abundant, and adopts automatic test mode, has improved efficiency of software testing and has avoidd the risk of manual operation error. In the embodiment, a set of equipment is used for completing various tests, so that the investment of experimental equipment is reduced, and the floor area of the experimental equipment is saved.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also combinations between technical features in the above embodiments or in different embodiments are possible, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A high voltage load test chamber, comprising: the system comprises a microcontroller and a test module, wherein the microcontroller is respectively connected with the test module and an external battery management system and is used for receiving and processing data of the test module and the external battery management system;
the test module comprises a total pressure detection module, an insulation resistance detection function test module, an overcurrent protection function test module, a temperature detection function test module and an SOC estimation function test module, wherein the total pressure detection module is used for collecting total pressure of a battery pack, the insulation resistance detection function test module is used for collecting insulation resistance of the battery pack, the overcurrent protection function test module is used for collecting voltage of the battery pack, the temperature detection function test module is used for collecting temperature of the battery pack, and the SOC estimation function test module is used for collecting SOC of the battery pack.
2. The high voltage load testing box according to claim 1, wherein said testing module further comprises a high voltage output multi-switching module for automatically switching the high voltage signal output of the battery pack.
3. The high-voltage load testing box according to claim 1, wherein the total pressure detection module comprises a voltage division unit and a filter unit, one end of the voltage division unit is connected with a high-voltage anode, the other end of the voltage division unit is connected with one end of the filter unit, and the other end of the filter unit is connected with a high-voltage cathode.
4. The high-voltage load testing box according to claim 3, wherein the voltage dividing unit comprises at least two first resistors with the same resistance value, and the filtering unit comprises a capacitor and a second resistor connected in parallel with the capacitor.
5. The high-voltage load testing box according to claim 1, wherein the insulation resistance detection function testing module comprises two second resistors with the same resistance value, and the two second resistors are connected between the high-voltage positive electrode and the high-voltage negative electrode.
6. The high-voltage load testing box according to claim 1, wherein the over-current protection function testing module comprises a third resistor, and the third resistor is connected between a high-voltage positive electrode and a high-voltage negative electrode.
7. The high voltage load testing box of claim 1, wherein said temperature detection function testing module comprises a fourth resistor, said fourth resistor being incorporated into said NTC testing circuit in place of said NTC thermistor.
8. The high-voltage load testing box according to claim 1, wherein the SOC estimation function detection module comprises a fifth resistor, and the fifth resistor is connected to the discharge testing circuit.
9. The high-voltage load testing box according to claim 2, wherein the high-voltage output multi-path switching module, the insulation resistance detection function testing module, the overcurrent protection function testing module and the temperature detection function testing module are all opened and closed through a relay control circuit.
10. The high voltage load testing box according to claim 1, further comprising a display device connected to said microcontroller for displaying the processing result of said microcontroller.
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| CN201922284204.3U CN211741541U (en) | 2019-12-18 | 2019-12-18 | High-voltage load test box |
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| CN201922284204.3U CN211741541U (en) | 2019-12-18 | 2019-12-18 | High-voltage load test box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030617A (en) * | 2021-03-10 | 2021-06-25 | 联合汽车电子（重庆）有限公司 | Intelligent multi-path inductive load card |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030617A (en) * | 2021-03-10 | 2021-06-25 | 联合汽车电子（重庆）有限公司 | Intelligent multi-path inductive load card |
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