Test tool

Abstract

The utility model discloses a test tool, relates to the technical field of a BMS system of an electric automobile, and especially relates to a test tool. The test tool comprises a resistance box, a control unit and an upper computer, the resistance box comprises a plurality of test resistors and a plurality of test capacitors, the resistance box is connected with a BMS system, the control unit is connected with the test resistors, the test capacitors and an access switch, the upper computer is connected with the control unit and the BMS system, the control unit outputs a control signal to control access of the access switch, and the control unit is connected with the BMS system. And the upper computer acquires the resistance value data, acquires the resistance value of the resistance box fed back by the BMS system, and compares the resistance value data with the resistance value of the resistance box detected by the BMS system to obtain the insulation resistance detection precision. According to the utility model, the test range coverage of the test tool can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a BMS system of an electric vehicle, in particular to a testing tool. Background Art

[0002] Insulation detection accuracy is one of the important indicators for measuring BMS performance. The range of insulation detection values ​​includes 20KΩ to 10MΩ. The range of insulation detection values ​​involves more resistance values. During insulation testing, parasitic capacitance needs to be added, and the capacitance range of parasitic capacitance includes 100nF to 5uF. The capacitance range of parasitic capacitance also involves more. Therefore, the operation process of insulation testing is more complicated and the efficiency of completing insulation testing is low.

[0003] The traditional test tool can simplify the operation process of the insulation test and improve the efficiency of the insulation test. However, since the traditional test tool has fewer test values, the test range coverage of the test tool is small. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a test tool that can improve the test range coverage of the test tool.

[0005] In a first aspect, an embodiment of the present utility model provides a test tool, comprising:

[0006] A resistance box, comprising a plurality of test resistors and a plurality of test capacitors, and connected to a BMS system;

[0007] A control unit, the control unit is connected to a plurality of the test resistors, a plurality of the test capacitors and an access switch, and is used to output a control signal to control the access switch to be connected, so that the test resistors and the test capacitors are connected to obtain resistance data;

[0008] A host computer is connected to the control unit and the BMS system, and is used to obtain the resistance data and the resistance value of the resistor box fed back by the BMS system, and compare the resistance data with the resistance value of the resistor box detected by the BMS system to obtain the insulation resistance detection accuracy.

[0009] The test fixture of the embodiment of the utility model has at least the following beneficial effects: the user closes the corresponding access switch according to actual needs to connect the corresponding test resistor and the corresponding test capacitor to the control unit, and the resistance value of the access control unit can be obtained according to the connected test resistor and the test capacitor, and the resistance value data is obtained, and the resistance value data is transmitted to the host computer, the host computer receives the resistance value data, and the BMS system detects the resistance box to obtain the resistance value connected to the resistance box to obtain the actual resistance value, and the host computer obtains the actual resistance value fed back by the BMS system, and the host computer compares the actual resistance value with the resistance value data to obtain the insulation resistance detection accuracy. By closing the required access switch by the user to connect the corresponding test resistor and the corresponding test capacitor, the connected resistance value is obtained, and the resistance value data is obtained, and the resistance value data is fed back to the BMS system through the host computer, so that the BMS system compares the resistance value of the detected resistance box with the resistance value data to obtain the insulation resistance detection accuracy, which can improve the test range coverage of the test fixture.

[0010] According to the test fixture of some other embodiments of the present utility model, the parasitic capacitance of the whole vehicle is simulated by a plurality of the test resistors and a plurality of the test capacitors.

[0011] According to the test tooling of some other embodiments of the present invention, the resistance box also includes a plurality of test switches, a first end of the test switch is connected to the test resistor or the test capacitor, a second end of the test switch is connected to the control unit, and a third end of the test switch is connected to a total pressure collection positive port of the BMS system or a total pressure collection negative port of the BMS system.

[0012] According to the test fixture of some other embodiments of the present utility model, one end of the test resistor is connected to the test switch, and the other end is grounded.

[0013] According to some other embodiments of the test tooling of the present invention, one end of the test capacitor is connected to the test switch, and the other end is grounded.

[0014] According to the test fixture of some other embodiments of the present invention, the IO port is configured by the host computer, so that the control unit is connected to the access switch through the IO port and drives the access switch through the IO port.

[0015] According to some other embodiments of the test tooling of the present invention, the IO port is connected to a first resistor, the first resistor is connected to the base of a transistor and a second resistor, the emitter of the transistor and the other end of the second resistor are both grounded, the collector of the transistor is connected to a third resistor, the other end of the third resistor is connected to the access switch and a fourth resistor, and the other end of the access switch and the fourth resistor are connected to a 3.3V power supply.

[0016] According to the test fixture of some other embodiments of the present utility model, the access switch includes any one of the following: a photoelectric coupler or a relay.

[0017] According to the test tooling of some other embodiments of the present invention, the control unit is connected to the host computer via CAN communication.

[0018] According to the test tooling of some other embodiments of the present utility model, the host computer is connected to the BMS system via CAN communication.

[0019] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a specific embodiment of the test tool in the embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of another specific embodiment of the testing tool in the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the concept and technical effects of the utility model in combination with the embodiments, so as to fully understand the purpose, features and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model.

[0023] In the description of the present invention, if there is a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. If a feature is referred to as being "set", "fixed", "connected", or "installed" on another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, connected, or installed on the other feature.

[0024] In the description of the embodiments of the present utility model, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than" or "exceed" is involved, it should be understood as not including the number itself, if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] Insulation detection accuracy is one of the important indicators for measuring BMS performance. The range of insulation detection values ​​includes 20KΩ to 10MΩ. The range of insulation detection values ​​involves more resistance values. During insulation testing, parasitic capacitance needs to be added, and the capacitance range of parasitic capacitance includes 100nF to 5uF. The capacitance range of parasitic capacitance also involves more. Therefore, the operation process of insulation testing is more complicated and the efficiency of completing insulation testing is low.

[0026] The traditional test tool can simplify the operation process of the insulation test and improve the efficiency of the insulation test. However, since the traditional test tool has fewer test values, the test range coverage of the test tool is small.

[0027] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a test tool that can improve the test range coverage of the test tool.

[0028] Reference Figure 1 , Figure 1 A schematic diagram of a test tool is shown in an embodiment of the utility model. In some embodiments, the test tool includes: a resistance box, a control unit and a host computer, the resistance box includes a plurality of test resistors and a plurality of test capacitors, the resistance box is connected to the BMS system, the control unit is connected to the plurality of test resistors, the plurality of test capacitors and the access switch, and the host computer is connected to the control unit and the BMS system.

[0029] The control unit outputs a control signal to control the access switch to access the test resistor and the test capacitor to obtain resistance data. The host computer obtains the resistance data and feeds the resistance data back to the BMS system so that the BMS system compares the resistance data with the resistance value of the BMS system detection resistor box to obtain the insulation resistance detection accuracy.

[0030] The test fixture of the embodiment of the utility model has at least the following beneficial effects: the user closes the corresponding access switch according to actual needs to connect the corresponding test resistor and the corresponding test capacitor to the control unit, and the resistance value of the access control unit can be obtained according to the connected test resistor and the test capacitor, and the resistance value data is obtained, and the resistance value data is transmitted to the host computer, the host computer receives the resistance value data, and the BMS system detects the resistance box to obtain the resistance value connected to the resistance box to obtain the actual resistance value, and the host computer obtains the actual resistance value fed back by the BMS system, and the host computer compares the actual resistance value with the resistance value data to obtain the insulation resistance detection accuracy. By closing the required access switch by the user to connect the corresponding test resistor and the corresponding test capacitor, the connected resistance value is obtained, and the resistance value data is obtained, and the resistance value data is fed back to the BMS system through the host computer, so that the BMS system compares the resistance value of the detected resistance box with the resistance value data to obtain the insulation resistance detection accuracy, which can improve the test range coverage of the test fixture.

[0031] In some embodiments, the parasitic capacitance of the entire vehicle is simulated by a plurality of test resistors and a plurality of test capacitors.

[0032] Reference Figure 1 In some embodiments, the resistor box further includes a plurality of test switches, a first end of a test switch is connected to a test resistor or a test capacitor, a second end of the test switch is connected to a control unit, and a third end of the test switch is connected to a total pressure collection positive port of a BMS system or a total pressure collection negative port of a BMS system.

[0033] It should be noted that the total pressure collection positive port of the BMS system is Figure 1 The B+ port in the BMS system is the negative port for total pressure collection. Figure 1 The B-port in the test switch is Figure 1 The switch Kn in the test resistor is Figure 1 The resistance Rn in the test capacitor is Figure 1 The capacitance Cn in.

[0034] The positive terminal of the resistor box is connected to the B+ port of the BMS system, the negative terminal of the resistor box is connected to the B- port of the BMS system, and the ground port of the resistor box is connected to the housing of the BMS system.

[0035] Reference Figure 1 In some embodiments, one end of the test resistor is connected to the test switch, and the other end is grounded.

[0036] Reference Figure 1 In some embodiments, one end of the test capacitor is connected to the test switch, and the other end is grounded.

[0037] Reference Figure 1 and Figure 2 , Figure 2The schematic diagram of the test fixture disclosed in one embodiment of the utility model is shown. In some embodiments, the IO port is configured by the host computer so that the control unit is connected to the access switch through the IO port and drives the access switch through the IO port.

[0038] It should be noted that each access switch is configured with an IO port of a control unit.

[0039] Reference Figure 1 and Figure 2 In some embodiments, the IO port is connected to a first resistor, the first resistor is connected to the base of the transistor and the second resistor, the emitter of the transistor and the other end of the second resistor are both grounded, the collector of the transistor is connected to a third resistor, the other end of the third resistor is connected to an access switch and a fourth resistor, and the other end of the access switch and the fourth resistor is connected to a 3.3V power supply.

[0040] It should be noted that the control unit controls the transistor to conduct to drive the access switch. The corresponding IO port is configured by the built-in software of the host computer to drive the access switch, and the connection relationship between the IO port and the access switch is written into the host computer. According to the actual number of capacitors and resistance values ​​required, the corresponding number of access switches are controlled to be closed. Among them, the test resistor and the test capacitor are both known, and the resistance value and parasitic capacitance to be tested can be obtained according to the connected test resistor and test capacitor.

[0041] In addition, after closing the access switch, the host computer starts timing until the BMS system reports the resistance value obtained by the detection resistor box. The BMS system reports the resistance value to the host computer. At this time, the BMS system is performing insulation detection. The host computer compares the detected resistance value with the resistance value of the access control unit to calculate the insulation resistance detection accuracy of the BMS system, which can improve the test efficiency and test coverage. In addition, the test tooling of the utility model has a simple structure and is easy to operate.

[0042] In some embodiments, the access switch includes any one of the following: a photocoupler or a relay.

[0043] It should be noted that the safety of the test fixture can be improved by using photocouplers or relays to isolate high and low voltages.

[0044] Reference Figure 1 In some embodiments, the control unit is connected to the host computer via CAN communication.

[0045] Reference Figure 1 In some embodiments, the host computer is connected to the BMS system via CAN communication.

[0046] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0047] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0048] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A test tool, characterized in that: include: A resistance box, comprising a plurality of test resistors and a plurality of test capacitors, and connected to a BMS system; A control unit, the control unit is connected to a plurality of the test resistors, a plurality of the test capacitors and an access switch, and is used to output a control signal to control the access switch to be connected, so that the test resistors and the test capacitors are connected to obtain resistance data; A host computer is connected to the control unit and the BMS system, and is used to obtain the resistance data and the resistance value of the resistor box fed back by the BMS system, and compare the resistance data with the resistance value of the resistor box detected by the BMS system to obtain the insulation resistance detection accuracy.

2. The test tool according to claim 1, characterized in that: The parasitic capacitance of the whole vehicle is simulated by using a plurality of the test resistors and a plurality of the test capacitors.

3. The test tool according to claim 1, characterized in that: The resistor box also includes a plurality of test switches, a first end of one of the test switches is connected to the test resistor or the test capacitor, a second end of the test switch is connected to the control unit, and a third end of the test switch is connected to a total pressure collection positive port of the BMS system or a total pressure collection negative port of the BMS system.

4. The test fixture according to claim 3, characterized in that: One end of the test resistor is connected to the test switch, and the other end is grounded.

5. The test tool according to claim 3, characterized in that: One end of the test capacitor is connected to the test switch, and the other end is grounded.

6. The test tool according to claim 1, characterized in that: The IO port is configured by the host computer so that the control unit is connected to the access switch through the IO port and drives the access switch through the IO port.

7. The test fixture according to claim 6, characterized in that: The IO port is connected to a first resistor, the first resistor is connected to the base of the transistor and the second resistor, the emitter of the transistor and the other end of the second resistor are both grounded, the collector of the transistor is connected to a third resistor, the other end of the third resistor is connected to the access switch and the fourth resistor, and the other end of the access switch and the fourth resistor are connected to a 3.3V power supply.

8. The test tool according to claim 1, characterized in that: The access switch includes any one of the following: a photoelectric coupler or a relay.

9. The test tool according to claim 1, characterized in that: The control unit is connected to the host computer via CAN communication.

10. The test fixture according to claim 1, characterized in that: The host computer is connected to the BMS system via CAN communication.

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