Test tool for battery management unit

Abstract

The utility model provides a test tool of a battery management unit. The test tool comprises a short power switch, a short ground switch, a simulation module and a connector. One end of the short power switch is connected with a first external low-voltage power supply; one end of the short-ground switch is grounded and the other end is connected with the simulation module; under the condition that the short power switch is switched on and the short ground switch is switched off, the simulation module is used for generating a simulation signal of the battery pack and / or simulating the working state of the battery pack under the short power condition; under the condition that the short power switch is switched off and the short ground switch is switched on, the battery simulation module is used for generating a simulation signal of the battery pack and / or simulating the working state of the battery pack under the condition of short circuit to ground; the simulation module is connected with the connector; the connector is connected with a battery management unit to be tested; the battery management unit to be tested is used for collecting analog signals and / or state parameters.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, in particular to a test tool for a battery management unit. BACKGROUND

[0002] With the increasing requirement of electronic equipment on the reliability of a battery management unit (BMU), the demand for the comprehensiveness of the test tool for the BMU is increasingly highlighted. In the prior art, in the test process for the BMU, the test data collected is limited, the test cannot be performed under different conditions, the demand for the comprehensive performance evaluation of the BMU cannot be met, and it is difficult to accurately determine the reliability of the BMU in actual use. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a test tool for a battery management unit to solve the problem that the BMU cannot be tested under different conditions.

[0004] The present application provides a test tool for a battery management unit, which comprises a short power supply switch, a short ground switch, an analog module and a connector. One end of the short power supply switch is connected to a first external low-voltage power supply, and the other end is connected to the analog module. One end of the short ground switch is grounded, and the other end is connected to the analog module. When the short power supply switch is closed and the short ground switch is open, the analog module is used to generate an analog signal of a battery pack and / or simulate the working state of the battery pack under short power supply conditions. When the short power supply switch is open and the short ground switch is closed, the battery analog module is used to generate an analog signal of a battery pack and / or simulate the working state of the battery pack under short-circuit-to-ground conditions. The analog module is connected to the connector, and the connector is connected to the battery management unit to be tested. The battery management unit to be tested is used to collect the analog signal and / or the state parameters corresponding to the working state of the battery pack.

[0005] Further, the analog module comprises a temperature control module for simulating the working temperature of the battery pack.

[0006] Further, the analog module further comprises a high-side drive module for simulating the relay load of the battery pack.

[0007] Further, the analog module further comprises a low-voltage power supply simulation module for generating an analog wake-up signal of the battery pack.

[0008] Further, the analog module further comprises a charging signal module for generating an analog guide signal of the battery pack.

[0009] Further, the simulation module further comprises a PWM signal simulation module, configured to generate an analog duty cycle signal and an analog collision signal of the battery pack.

[0010] Further, the simulation module further comprises a short circuit signal module, configured to generate an analog interlock signal of the battery pack.

[0011] Further, the test tool for the battery management unit further comprises a high-voltage power supply simulation module connected with the connector; the high-voltage power supply simulation module has a first interface and a second interface; the first interface is configured to connect an external high-voltage power supply, and the external high-voltage power supply is configured to supply power to the high-voltage power supply simulation module; the second interface is configured to connect a second external low-voltage power supply; and the second external low-voltage power supply is configured to simulate a voltage of the battery pack.

[0012] Further, the test tool for the battery management unit further comprises an insulation alarm simulation module connected with the connector, configured to generate an insulation alarm value of the battery pack in a simulated grounding condition.

[0013] Further, the test tool for the battery management unit further comprises a communication module connected with the connector and an upper computer, configured to transmit the analog signals and / or state parameters collected by the battery management unit under test to the upper computer.

[0014] The present application can provide two test scenarios, and can provide various signals or data in the two test scenarios, thereby improving the reliability and comprehensiveness of the test. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the drawings shown.

[0016] Figure 1 A structural schematic diagram of a test tool for a battery management unit according to an embodiment of the present application is shown in FIG. 1.

[0017] Figure 2 A structural schematic diagram of a test tool for a battery management unit according to an embodiment of the present application is shown in FIG. 1.

[0018] Figure 3 A structural schematic diagram of a test tool for a battery management unit according to an embodiment of the present application is shown in FIG. 1.

[0019] A structural schematic diagram of a test tool for a battery management unit according to an embodiment of the present application is shown in FIG. 1.Figure 4 A structural schematic diagram of a temperature control module provided for an embodiment of the present application;

[0020] Figure 5 A structural schematic diagram of a high-side drive module provided for an embodiment of the present application;

[0021] Figure 6 A structural schematic diagram of a low-voltage power supply simulation module provided for an embodiment of the present application;

[0022] Figure 7 A structural schematic diagram of a charging signal module provided for an embodiment of the present application;

[0023] Figure 8 A structural schematic diagram of a PWM signal simulation module provided for an embodiment of the present application;

[0024] Figure 9 A structural schematic diagram of a short-circuit signal module provided for an embodiment of the present application;

[0025] Figure 10 A structural schematic diagram of a high-voltage power supply simulation module provided for an embodiment of the present application;

[0026] Figure 11 A structural schematic diagram of an insulation alarm simulation module provided for an embodiment of the present application;

[0027] Figure 12 A structural schematic diagram of a communication module provided for an embodiment of the present application;

[0028] Figure 13 A structural schematic diagram of a low-voltage power supply simulation module provided for an embodiment of the present application;

[0029] Figure 14 A structural schematic diagram of a connector provided for an embodiment of the present application;

[0030] Figure 15 A structural schematic diagram of a first plug-in provided for an embodiment of the present application.

[0031] Reference signs:

[0032] 1 - test tool of battery management unit, KS1 - short power supply switch, KS2 - short ground switch, 10 - simulation module, 20 - connector, 30 - high-voltage power supply simulation module, 40 - insulation alarm simulation module, 50 - communication module, 60 - battery management unit to be tested, 70 - upper computer, 80 - circuit board structure;

[0033] 101-temperature control module, 102-high side drive module, 103-low voltage power analog module, 104-charge signal module, 105-PWM signal analog module, 106-short signal module, 301-first interface, 302-second interface;

[0034] S1-first switch, S2-second switch, S3-third switch, S4-fourth switch, S5-fifth switch, S6-sixth switch, S7-seventh switch, S8-eighth switch, S9-ninth switch, S10-tenth switch, S11-eleventh switch, S12-twelfth switch, S13-thirteenth switch, S14-fourteenth switch, S15-fifteenth switch, S16-sixteenth switch, S17-seventeenth switch, JK1-relay, R1-first resistor, R2-second resistor, R3-third resistor, S18-eighteenth switch, S19-nineteenth switch, S20-twentieth switch, S21-twenty-first switch, S22-twenty-second switch, S23-twenty-third switch, S24-twenty-fourth switch, S25-twenty-fifth switch, S26-twenty-sixth switch, S27-twenty-seventh switch, S28-twenty-eighth switch, S29-twenty-ninth switch, S30-thirtieth switch, S31-thirty-first switch, S32-thirty-second switch;

[0035] KL30-first external low voltage power supply, D2-bidirectional breakdown diode, C1-first capacitor, C6-second capacitor, C4-third capacitor, C7-fourth capacitor, C5-fifth capacitor, C8-sixth capacitor, M91-transistor, D-drain, S-source, G-gate, R390-fourth resistor, R391-fifth resistor, C9-seventh capacitor, R389-sixth resistor, D4-regular diode, V CC_12V -output voltage;

[0036] J1-first plug, J2-second plug, J3-third plug, J4-fourth plug, J5-fifth plug, J6-sixth plug, J7-seventh plug, J8-eighth plug, J9-ninth plug. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms "vertical direction", "upper", "lower", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the description of the present application, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such article or device. Without more limitations, the element defined by the sentence "including a…" does not exclude the presence of another identical element in the article or device including the element.

[0041] With the increasing demand for reliability of battery management unit (BMU) by electronic devices, the demand for comprehensive testing of BMU is becoming more and more prominent. In the prior art, during the testing process of the BMU, the test data collected by the test tool is limited, and the test cannot be performed under different conditions, which cannot meet the demand for comprehensive performance evaluation of the BMU, resulting in difficulty in accurately judging the reliability of the BMU in actual use.

[0042] In view of the technical problem that the test data collected by the existing test tool is not comprehensive, the present application provides a battery management unit test tool to overcome the above problems.

[0043] A battery management unit test tool provided by the present application will be described below with reference to the accompanying drawings. The following battery management unit and the following battery pack are applied to an automobile.

[0044] In some embodiments, please refer to Figure 1The application provides a battery management unit test tool 1, which comprises a short power supply switch KS1, a short ground switch KS2, an analog module 10 and a connector 20. One end of the short power supply switch KS1 is connected with a first external low-voltage power supply, and the other end is connected with the analog module 10. One end of the short ground switch KS2 is grounded, and the other end is connected with the analog module 10. When the short power supply switch KS1 is closed and the short ground switch KS2 is disconnected, the analog module 10 is used for generating an analog signal of a battery pack and / or simulating an operating state of the battery pack under a short power supply condition. When the short power supply switch KS1 is disconnected and the short ground switch KS2 is closed, the battery analog module 10 is used for generating an analog signal of a battery pack and / or simulating an operating state of the battery pack under a short-circuit-to-ground condition. The analog module 10 is connected with the connector 20. The connector 20 is connected with a battery management unit 60 to be tested. The battery management unit 60 to be tested is used for collecting the analog signal and / or collecting state parameters corresponding to the operating state of the battery pack.

[0045] Specifically, the application adopts the form of simulating a battery pack for testing, that is, the analog module 10 is used for simulating relevant signals of the battery pack and the operating state of the battery pack. The battery management unit 60 to be tested is used for collecting the analog signal of the battery pack and collecting state parameters corresponding to the operating state of the battery pack.

[0046] Specifically, the operating state comprises different operating temperatures and different relay loads. The state parameters comprise temperature values, current values of the relay load and voltage values of the relay load.

[0047] Specifically, the analog signal comprises an analog wake-up signal, an analog guide signal, an analog duty cycle signal, an analog collision signal and an analog interlock signal.

[0048] In some embodiments, the first external low-voltage power supply is used for supplying power to the battery management unit test tool 1.

[0049] In some embodiments, reference can be made to Figure 2 and Figure 3As shown, the simulation module 10 includes a temperature control module 101 for simulating the operating temperature of the battery pack. The simulation module 10 also includes a high-side drive module 102 for simulating the relay load of the battery pack. The simulation module 10 further includes a low-voltage power supply simulation module 103 for generating a simulated wake-up signal for the battery pack. The simulation module 10 also includes a charging signal module 104 for generating a simulated guidance signal for the battery pack. The simulation module 10 also includes a PWM (Pulse Width Modulation) signal simulation module 105 for generating a simulated duty cycle signal and a simulated collision signal for the battery pack. The simulation module 10 also includes a short-circuit signal module 106 for generating a simulated interlock signal for the battery pack.

[0050] Specifically, the temperature control module 101, the high-side drive module 102, the low-voltage power supply simulation module 103, the charging signal module 104, the PWM signal simulation module 105, and the short-circuit signal module 106 are connected in parallel.

[0051] In some embodiments, see Figure 2 As shown, the temperature control module 101 is connected to the first switch S1. The first switch S1 is used to control whether the temperature control module 101 is connected to the circuit. When the first switch S1 is closed, the temperature control module 101 is connected to the circuit to simulate different operating temperatures of the battery pack. The battery management unit 60 under test can be used to collect temperature values.

[0052] In some embodiments, see Figure 4 As shown, the temperature control module 101 includes a ninth switch S9, a tenth switch S10, an eleventh switch S11, a twelfth switch S12, a thirteenth switch S13, and a thermistor ( Figure 4 (Not shown). With the ninth switch S9 closed, the temperature control module 101 controls the thermistor's operating temperature to be -40°C, and the battery management unit 60 under test then collects the thermistor's temperature value. With the tenth switch S10 closed, the temperature control module 101 controls the thermistor's operating temperature to be 0°C, and the battery management unit 60 under test then collects the thermistor's temperature value. With the eleventh switch S11 closed, the temperature control module 101 controls the thermistor's operating temperature to be 25°C, and the battery management unit 60 under test then collects the thermistor's temperature value. With the twelfth switch S12 closed, the temperature control module 101 controls the thermistor's operating temperature to be 75°C, and the battery management unit 60 under test then collects the thermistor's temperature value. With the thirteenth switch S13 closed, the temperature control module 101 controls the thermistor's operating temperature to be 125°C, and the battery management unit 60 under test then collects the thermistor's temperature value.

[0053] In some embodiments, referring to Figure 2 As shown, the high-side drive module 102 is connected with the second switch S2, and the second switch S2 is used to control whether the high-side drive module 102 is connected to the circuit. When the second switch S2 is closed, the high-side drive module 102 is connected to the circuit, and is used to simulate the relay load of the battery pack. The battery management unit 60 to be tested can be used to collect the current value of the relay load and the voltage value of the relay load.

[0054] In some embodiments, referring to Figure 5 As shown, the high-side drive module 102 includes the fourteenth switch S14, the fifteenth switch S15, the sixteenth switch S16, the seventeenth switch S17, the relay JK1 (referring to the relay in the battery pack monitored by the battery management unit in actual application, and the theoretical resistance value of the relay JK1 is equal to 24Ω, the maximum resistance value is equal to 34Ω, and the minimum resistance value is equal to 16Ω), the first resistor R1, the second resistor R2, and the third resistor R3. When the fourteenth switch S14 is closed, the high-side drive module 102 connects the relay JK1 to the circuit, and the battery management unit 60 to be tested can be used to collect the voltage value and the current value of the relay JK1. When the fifteenth switch S15 is closed, the high-side drive module 102 connects the first resistor R1 to the circuit, and the first resistor R1 is equal to 16Ω, which is used as a simulated relay load. The battery management unit 60 to be tested can be used to collect the voltage value and the current value of the first resistor R1. When the sixteenth switch S16 is closed, the high-side drive module 102 connects the second resistor R2 to the circuit, and the second resistor R2 is equal to 24Ω, which is used as a simulated relay load. The battery management unit 60 to be tested can be used to collect the voltage value and the current value of the second resistor R2. When the seventeenth switch S17 is closed, the high-side drive module 102 connects the third resistor R3 to the circuit, and the third resistor R3 is equal to 34Ω, which is used as a simulated relay load. The battery management unit 60 to be tested can be used to collect the voltage value and the current value of the third resistor R3.

[0055] In some embodiments, referring to Figure 2 As shown, the third switch S3 is connected with the low-voltage power supply simulation module 103, the charging signal module 104, and the PWM signal simulation module 105, respectively. When the third switch S3 is closed, the low-voltage power supply simulation module 103, the charging signal module 104, and the PWM signal simulation module 105 are connected to the circuit, and can generate corresponding simulated wake-up signals, simulated guide signals, simulated duty cycle signals, and simulated collision signals.

[0056] In some embodiments, the analog wake-up signal includes an analog AC (Alternating Current) wake-up signal, an analog DC (Direct Current) wake-up signal, an analog BPS (Battery Pressure Sensor) wake-up signal, an analog BCM (Battery Control Module) wake-up signal, a 12VDC BMS power supply signal, an analog KL15 (ignition switch) wake-up signal. Referring to Figure 6 As shown, the low-voltage power supply analog module 103 includes an eighteenth switch S18, a nineteenth switch S19, a twentieth switch S20, a twenty-first switch S21, a twenty-second switch S22, and a twenty-third switch S23. When the eighteenth switch S18 is closed, the low-voltage power supply analog module 103 generates an analog AC wake-up signal. When the nineteenth switch S19 is closed, the low-voltage power supply analog module 103 generates an analog DC wake-up signal. When the twentieth switch S20 is closed, the low-voltage power supply analog module 103 generates an analog BPS wake-up signal. When the twenty-first switch S21 is closed, the low-voltage power supply analog module 103 generates an analog BCM wake-up signal. When the twenty-second switch S22 is closed, the low-voltage power supply analog module 103 generates a 12VDC BMS power supply signal. When the twenty-third switch S23 is closed, the low-voltage power supply analog module 103 generates an analog KL15 wake-up signal.

[0057] In some embodiments, referring to Figure 7 As shown, when the twenty-fourth switch S24 is closed, the charging signal module 104 generates an analog guide signal (CC signal) when the car is fast charging; when the twenty-fifth switch S25 is closed, the charging signal module 104 generates an analog guide signal (CC2 signal) when the car is slow charging.

[0058] In some embodiments, referring to Figure 8 As shown, the PWM signal analog module 105 is specifically a JK2 signal generator; when the twenty-sixth switch S26 is closed, the PWM signal analog module 105 generates an analog duty cycle signal; when the twenty-seventh switch S27 is closed, the PWM signal analog module 105 generates an analog collision signal.

[0059] In some embodiments, referring to Figure 2 As shown, the fourth switch S4 and the short circuit signal module 106 are connected. When the fourth switch S4 is closed, the short circuit signal module 106 is connected to the circuit and can generate an analog interlock signal. Referring to Figure 9As shown, the short-circuit signal module 106 generates an analog interlock signal of the front motor connected with the battery pack aviation plug in the case of the closure of the twenty-eighth switch S28; the short-circuit signal module 106 generates an analog interlock signal of the rear motor connected with the battery pack aviation plug in the case of the closure of the twenty-ninth switch S29; the short-circuit signal module 106 generates an analog interlock signal of the OBC (on-board charger) connected with the battery pack aviation plug in the case of the closure of the thirtieth switch S30; the short-circuit signal module 106 generates an analog interlock signal of the DC heater connected with the battery pack aviation plug in the case of the closure of the thirty-first switch S31; the thirty-second switch S32 is a reserved switch, and other analog interlock signals can be connected in subsequent actual applications.

[0060] In some embodiments, referring to Figure 10 As shown, the test tool 1 of the battery management unit further comprises a high-voltage power supply simulation module 30 connected with the connector 20; the high-voltage power supply simulation module 30 has a first interface 301 and a second interface 302; the first interface 301 is used for connecting an external high-voltage power supply for supplying power to the high-voltage power supply simulation module 30; and the second interface 302 is used for connecting a second external low-voltage power supply for simulating the voltage of the battery pack.

[0061] In some embodiments, referring to Figure 11 As shown, the test tool 1 of the battery management unit further comprises an insulation alarm simulation module 40 connected with the connector 20 for generating an insulation alarm value of the battery pack in the case of simulated grounding. Specifically, the insulation alarm simulation module 40 is used for generating insulation alarm values of 50MΩ, 10MΩ, 5MΩ, 1MΩ, 500kΩ, 250kΩ, 100kΩ, 50kΩ, 20kΩ, 10kΩ corresponding to the case of positive electrode simulated grounding of the battery pack; and the insulation alarm simulation module 40 is further used for generating insulation alarm values of 50MΩ, 10MΩ, 5MΩ, 1MΩ, 500kΩ, 250kΩ, 100kΩ, 50kΩ, 20kΩ, 10kΩ corresponding to the case of negative electrode simulated grounding of the battery pack.

[0062] In some embodiments, referring to Figure 12As shown, the test tool 1 of the battery management unit further comprises a communication module 50 connected with the host computer 70 and the connector 20, for transmitting the analog signals and / or state parameters collected by the battery management unit 60 under test to the host computer 70. The host computer 70 is used for analyzing the analog signals and / or state parameters to obtain the test result of the battery management unit 60 under test. Specifically, the communication module 50 is a CAN (Controller Area Network) chip or CAN board card with CAN communication function.

[0063] In some embodiments, referring to Figure 3 As shown, the fifth switch S5 is connected with the temperature control module 101, the sixth switch S6 is connected with the high-side drive module 102, and the seventh switch S7 is connected with the low-voltage power supply simulation module 103, the charging signal module 104, and the PWM signal simulation module 105, respectively. The eighth switch S8 is connected with the short circuit signal module 106. When the fifth switch S5 is closed, the temperature control module 101 is connected to the circuit; when the sixth switch S6 is closed, the high-side drive module 102 is connected to the circuit; when the seventh switch S7 is closed, the low-voltage power supply simulation module 103, the charging signal module 104, and the PWM signal simulation module 105 are connected to the circuit; and when the eighth switch S8 is closed, the short circuit signal module 106 is connected to the circuit.

[0064] Based on the above embodiments, by controlling the opening and closing of the short power supply switch KS1 and the short ground switch KS2, a short power supply scenario or a short circuit to ground (short ground) scenario can be generated. Further, in the short power supply scenario, by controlling the opening and closing of the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4, different analog signals or working states can be generated. Further, in the short circuit to ground scenario, by controlling the opening and closing of the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8, different analog signals or working states can be generated. Therefore, the present application can provide two test scenarios, and through multi-gear control in the two test scenarios, a variety of signals or data can be provided, improving the reliability and comprehensiveness of the test, and meeting the signal short power supply, short ground, and other test functions. Further, by controlling the opening and closing states of different switches, the multi-wire and single-wire open circuit of the battery management unit wiring can be simulated.

[0065] In some embodiments, the structure of the low-voltage power supply simulation module 103 is shown in Figure 13 As shown, Vcc-12V represents the output voltage of the module, and KL30 represents the first external low-voltage power supply, which is subjected to clamping protection and filtering processing to ensure the stability of the output analog wake-up signal.

[0066] In some embodiments, referring toFigure 14 As shown, the connector 20 specifically comprises: a circuit board structure 80, a first plug J1, a second plug J2, a third plug J3, a fourth plug J4, a fifth plug J5, a sixth plug J6, a seventh plug J7, an eighth plug J8, a ninth plug J9. The circuit board structure 80 is connected with the first plug J1, the second plug J2, the third plug J3, the fourth plug J4, the fifth plug J5, the sixth plug J6, the seventh plug J7, the eighth plug J8, the ninth plug J9 respectively. The analog module 10, the high-voltage power supply analog module 30, the insulation alarm analog module 40, and the communication module 50 are arranged inside the circuit board structure 80 and connected with the circuit board structure 80 (not shown). The first plug J1, the second plug J2, the third plug J3, the fourth plug J4, the fifth plug J5, the sixth plug J6, the seventh plug J7, the eighth plug J8, and the ninth plug J9 are arranged at the edge of the circuit board structure 80. Each switch (including the short power switch KS1, the short ground switch KS2, the first switch S1 to the thirty-second switch S32) is arranged on the surface (not shown) of the circuit board structure 80 to facilitate the user to control the on-off of the switch. The first plug J1 and the second plug J2 are used to connect the battery management unit 60 (not shown) to be tested, the third plug J3 is connected with the first interface 301 (not shown) in the high-voltage power supply analog module 30 and the external high-voltage power supply respectively, the fourth plug J4 is connected with the second interface 302 (not shown) in the high-voltage power supply analog module 30 and the second external low-voltage power supply respectively, the fifth plug J5 and the sixth plug J6 are connected with the first external low-voltage power supply, the seventh plug J7, the eighth plug J8, the ninth plug J9, and the communication module 50 are connected (not shown). Further, the above-mentioned multiple plugs can be compatible with multiple models of battery management units, reducing the need to replace test tools due to different models of battery management units, saving cost and time. Based on this embodiment, the integrated management and control of each module are realized, the volume of the test tool is reduced, and it is convenient to carry.

[0067] In some embodiments, the specific structure of the first plug J1 is as shown in Figure 15 As shown, the first plug J1 is made of high-strength insulating material to ensure safety in use, and can also ensure close and stable connection with the battery management unit to be tested, stable transmission of analog signals and state parameters, and avoid data loss. It should be noted that the first plug J1 is exemplarily described in the present application, and the specific structure of other plugs can be referred to the first plug J1.

[0068] In summary, although the application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the application, and therefore the protection scope of the application is defined by the scope of the claims.

Claims

1. A test fixture for a battery management unit, characterized by, The test tool (1) of the battery management unit comprises a short power switch (KS1), a short ground switch (KS2), an analog module (10), and a connector (20); One end of the short power switch (KS1) is connected to a first external low-voltage power supply, and the other end is connected to the analog module (10); one end of the short ground switch (KS2) is grounded, and the other end is connected to the analog module (10); In the case that the short power switch (KS1) is closed and the short ground switch (KS2) is open, the analog module (10) is used to generate analog signals of the battery pack and / or simulate the working state of the battery pack under short power supply conditions; In the case that the short power switch (KS1) is open and the short ground switch (KS2) is closed, the analog module (10) is used to generate analog signals of the battery pack and / or simulate the working state of the battery pack under short-circuit-to-ground conditions; The analog module (10) is connected to the connector (20); the connector (20) is connected to the battery management unit (60) to be tested; and the battery management unit (60) to be tested is used to collect analog signals and / or state parameters corresponding to the working state of the battery pack.

2. The test fixture for battery management units of claim 1, wherein, The analog module (10) comprises a temperature control module (101) for simulating the working temperature of the battery pack.

3. The test fixture for battery management units of claim 2, wherein, The analog module (10) further comprises a high-side drive module (102) for simulating the relay load of the battery pack.

4. The test fixture for battery management units of claim 2, wherein, The analog module (10) further comprises a low-voltage power supply simulation module (103) for generating an analog wake-up signal of the battery pack.

5. The test fixture for battery management units of claim 2, wherein, The analog module (10) further comprises a charging signal module (104) for generating an analog guide signal of the battery pack.

6. The test fixture for battery management units of claim 2, wherein, The analog module (10) further comprises a PWM signal simulation module (105) for generating an analog duty cycle signal and an analog collision signal of the battery pack.

7. The test fixture for battery management units of claim 2, wherein, The analog module (10) further comprises a short-circuit signal module (106) for generating an analog interlock signal of the battery pack.

8. The test fixture for battery management units of claim 1, wherein, The test tool (1) of the battery management unit further comprises a high-voltage power supply simulation module (30), which is connected to the connector (20); The high-voltage power supply simulation module (30) has a first interface (301) and a second interface (302); the first interface (301) is used to connect an external high-voltage power supply for supplying power to the high-voltage power supply simulation module (30); The second interface (302) is used to connect a second external low-voltage power supply; the second external low-voltage power supply is used to simulate the voltage of the battery pack.

9. The test fixture for battery management units of claim 1, wherein, The test tool (1) of the battery management unit further comprises an insulation alarm simulation module (40); the insulation alarm simulation module (40) is connected to the connector (20) and is used to generate an insulation alarm value of the battery pack under simulated grounding conditions.

10. The test fixture for battery management units of claim 1, wherein, The test tool (1) of the battery management unit further comprises a communication module (50) connected with the connector (20) and the upper computer (70), for transmitting the analog signals and / or state parameters collected by the battery management unit (60) to be tested to the upper computer (70).

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