A test tool platform for a high-voltage control box system of an energy storage battery

Abstract

The utility model relates to a kind of test tool platform of energy storage battery high voltage control cabinet system, comprising: DCDC power supply circuit, control circuit, isolated voltage output circuit, detection control module and high voltage signal sampling circuit.The test tool platform provided by the utility model constructs multistage power supply network by DCDC power supply circuit, injects analog battery voltage to energy storage battery high voltage control cabinet by isolated voltage output circuit, executes the action sequence of detection control by control circuit cooperation detection control module, synchronously gathers feedback signal by high voltage signal acquisition sample circuit, finally exports test result, forms the complete test closed loop of "power supply-supplying-signal excitation-data acquisition-threshold value determination-result feedback", significantly improves test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery technology, specifically a test tooling platform for an energy storage battery high-voltage control box system. Background Technology

[0002] With the accelerated global energy transition and the booming development of the new energy industry, the demand for energy storage continues to rise. As a core component of energy storage battery systems, the high-voltage control box plays a crucial role. It integrates key functions such as charge and discharge control, system protection, and condition monitoring.

[0003] The high-voltage control box has a complex and sophisticated internal structure, containing key electrical components such as circuit breakers, pre-charge relays, main positive / negative relays, fuses, Hall current sensors, and pre-charge resistors, as well as core control components such as the battery cluster management unit (BCU) and switching power supply. These components work together to ensure the stable operation and safety performance of the energy storage system.

[0004] To meet specific application requirements, some high-voltage control boxes adopt a highly compact design, achieving deep integration of multiple functions within a limited space. This design not only simplifies the system architecture and reduces the footprint, but also significantly improves the ease of installation and maintenance. At the same time, high-voltage control boxes typically provide rich interface functions, including grid connection interfaces and communication interfaces with monitoring systems, thereby enhancing the system's flexibility and scalability.

[0005] Accordingly, during the development and testing phase of the high-voltage control box, a test and verification platform capable of simulating real-world application scenarios needs to be built. This platform must be able to generate and acquire necessary information such as high-voltage analog signals, relay control signals, CAN communication data, and high / low level signals.

[0006] However, traditional testing methods typically use battery modules or high-voltage sources for control, which not only poses safety hazards but also presents problems such as complicated wiring, time-consuming and labor-intensive processes, and large space requirements, bringing significant inconvenience and challenges to the testing work. Utility Model Content

[0007] This utility model addresses the technical problems existing in the prior art by providing a multi-channel power supply system.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0009] The DC-DC power supply circuit, control circuit, isolation voltage output circuit, detection and control module, and high-voltage signal sampling circuit are included.

[0010] The input terminal of the DC-DC power supply circuit is connected to the DC power supply of the high-voltage control box of the energy storage battery, and the output terminal of the DC-DC power supply circuit is connected to the control circuit and the isolation voltage output circuit respectively.

[0011] The isolation voltage output circuit is connected to the total voltage input of the high voltage control box of the energy storage battery, and serves as the input high voltage source to provide an isolated high voltage signal to the high voltage signal sampling circuit.

[0012] The control circuit is connected to the detection control module and the high-voltage signal sampling circuit respectively, and is used to control the detection control module to perform functional detection on the high-voltage control box of the energy storage battery and to control the high-voltage signal sampling circuit to collect the voltage data of the high-voltage control box of the energy storage battery.

[0013] As a further technical solution, the test fixture platform for the energy storage battery high-voltage control box system also includes:

[0014] A serial communication display circuit is provided, which is connected to the control circuit and is used to output the test results on the display screen.

[0015] As a further technical solution, the DC-DC power supply circuit includes:

[0016] A first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit;

[0017] The input terminal of the first voltage conversion circuit is connected to the DC power supply of the high voltage control box of the energy storage battery, and performs voltage conversion on the DC power supply;

[0018] The output terminal of the first voltage conversion circuit is connected to the second voltage conversion circuit and the third voltage conversion circuit respectively. The second voltage conversion circuit and the third voltage conversion circuit are used to adjust the voltage of the power supply after voltage conversion.

[0019] As a further technical solution, the control circuit includes:

[0020] MCU circuit, reset circuit, and EEPROM circuit;

[0021] The MCU circuit is connected to the DC-DC power supply circuit, the isolation voltage output circuit, the detection and control module, the high-voltage signal sampling circuit, the reset circuit, and the EEPROM circuit, respectively.

[0022] The reset circuit is used to power-on reset the MCU circuit;

[0023] The EEPROM circuit is used to provide external data storage for the MCU circuit.

[0024] As a further technical solution, the detection control module includes:

[0025] CAN communication circuit, Hall sensor power supply circuit, among which,

[0026] One end of the CAN communication circuit is connected to the Hall sensor in the high-voltage control box of the energy storage battery via CAN communication, and the other end is connected to the control circuit to determine whether the Hall sensor wiring harness and orientation are abnormal.

[0027] One end of the Hall sensor power supply circuit is connected to the DC-DC power supply circuit and the control circuit, and the other end is connected to the Hall sensor power supply harness of the high-voltage control box of the energy storage battery, for powering the Hall sensor.

[0028] As a further technical solution, the detection and control module also includes:

[0029] A power input detection circuit is connected to the DC-DC power supply circuit and the control circuit. It is used to generate a small signal voltage from the input voltage of the DC-DC power supply circuit in the form of a series voltage divider and transmit it to the control circuit for voltage acquisition.

[0030] As a further technical solution, the detection and control module also includes:

[0031] Circuit breaker auxiliary contact detection circuit, circuit breaker tripping and fan control circuit;

[0032] The circuit breaker auxiliary contact detection circuit is connected to the control circuit and the circuit breaker auxiliary contacts in the energy storage battery high voltage control box, respectively, and is used to collect the high and low level changes of the auxiliary contacts.

[0033] One end of the circuit breaker tripping and fan control circuit is connected to the circuit breaker tripping control pin and the fan control pin of the energy storage battery high-voltage control box, and the other end is connected to the control circuit for collecting fan current.

[0034] As a further technical solution, the detection and control module also includes:

[0035] The relay control circuit and the relay auxiliary contact detection circuit, among which,

[0036] One end of the relay control circuit is connected to the relay inside the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, which is used to control the closing and opening of the relay.

[0037] One end of the relay auxiliary contact detection circuit is connected to the relay auxiliary contact in the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, used to determine whether the relay auxiliary contact is normal.

[0038] As a further technical solution, the detection and control module also includes:

[0039] The high-voltage box contains an internal temperature detection circuit and an external wiring harness detection circuit.

[0040] One end of the temperature detection circuit inside the high-voltage box is connected to the temperature probe inside the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, used to detect and calculate the temperature value inside the box;

[0041] One end of the external wiring harness detection circuit is connected to the connector wiring harness on the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, used to detect and determine whether there is any abnormality in the connector wiring harness.

[0042] As a further technical solution, the high-voltage signal sampling circuit includes:

[0043] Isolated SPI communication circuit, ADC acquisition circuit and high voltage signal acquisition circuit;

[0044] The high-voltage signal acquisition circuit transmits the high voltage to the ADC acquisition circuit through resistor voltage division.

[0045] The ADC acquisition circuit transmits the acquired data to the control circuit through the isolated SPI communication circuit.

[0046] The test fixture platform provided by this utility model constructs a multi-level power supply network through a DC-DC power supply circuit. The simulated battery voltage is injected into the high-voltage control box of the energy storage battery through the isolation voltage output circuit. The control circuit coordinates with the detection and control module to execute the action sequence of detection and control. Simultaneously, the feedback signal is collected through the high-voltage signal acquisition circuit, and finally the test result is output, forming a complete test closed loop of "power supply - signal excitation - data acquisition - threshold judgment - result feedback", which significantly improves the test efficiency. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the test fixture platform for a high-voltage control box system for energy storage batteries provided by this utility model;

[0048] Figure 2 This is a topology diagram of the serial port display communication circuit provided by this utility model;

[0049] Figure 3 This is a topology diagram of the DC-DC power supply circuit provided by this utility model;

[0050] Figure 4 This is a topology diagram of the control circuit chip and reset circuit provided by this utility model;

[0051] Figure 5 This is a topology diagram of the isolation voltage output circuit provided by this utility model;

[0052] Figure 6 This is a CAN communication circuit topology diagram provided by this utility model;

[0053] Figure 7 This is a topology diagram of the Hall sensor power supply circuit provided by this utility model;

[0054] Figure 8 This is a topology diagram of the power input detection circuit provided by this utility model;

[0055] Figure 9 This is the topology diagram of the circuit breaker auxiliary contact detection circuit provided by this utility model;

[0056] Figure 10 This is the circuit breaker tripping / fan control circuit topology diagram provided by this utility model;

[0057] Figure 11 This is a topology diagram of the relay control circuit provided by this utility model;

[0058] Figure 12 This is a topology diagram of the relay auxiliary contact detection circuit provided by this utility model;

[0059] Figure 13 This is the topology diagram of the high-voltage box internal temperature detection circuit provided by this utility model;

[0060] Figure 14 This is a topology diagram of the external wire harness detection circuit provided by this utility model;

[0061] Figure 15 This is a topology diagram of the high-voltage signal acquisition circuit provided by this utility model.

[0062] Explanation of reference numerals in the attached diagram: 1. DC-DC power supply circuit; 2. Control circuit; 3. Isolation voltage output circuit; 4. Detection and control module; 5. High-voltage signal sampling circuit; 6. Circuit breaker auxiliary contact detection circuit; 7. Circuit breaker tripping / fan control circuit; 8. Relay control circuit; 9. Relay auxiliary contact detection circuit; 10. High-voltage box internal temperature detection circuit; 11. External wiring harness detection circuit; 12. CAN communication circuit; 13. Hall sensor power supply circuit; 14. Power input detection circuit; 15. Serial port display communication circuit. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0065] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0066] Figure 1 This is a schematic diagram of the test fixture platform for a high-voltage control box system for energy storage batteries provided by this utility model. Figure 1 As shown, it includes:

[0067] The DC-DC power supply circuit, control circuit, isolation voltage output circuit, detection and control module, and high-voltage signal sampling circuit are included.

[0068] The input terminal of the DC-DC power supply circuit is connected to the DC power supply of the high-voltage control box of the energy storage battery, and the output terminal of the DC-DC power supply circuit is connected to the control circuit and the isolation voltage output circuit respectively.

[0069] The isolation voltage output circuit is connected to the total voltage input of the high voltage control box of the energy storage battery, and serves as the input high voltage source to provide an isolated high voltage signal to the high voltage signal sampling circuit.

[0070] The control circuit is connected to the detection control module and the high-voltage signal sampling circuit respectively, and is used to control the detection control module to perform functional detection on the high-voltage control box of the energy storage battery and to control the high-voltage signal sampling circuit to collect the voltage data of the high-voltage control box of the energy storage battery.

[0071] like Figure 1 As shown, it should be noted that the detection and control module is a collective term for a series of functional module circuits that can be implemented and completed on the testing tooling platform, but the functions of each functional module circuit are independent of each other.

[0072] One end of the DC-DC power supply circuit is connected to the 24V DC power supply inside the high-voltage box, and the other end is connected to the control circuit, isolation voltage output circuit, power input detection circuit, circuit breaker auxiliary contact detection circuit, circuit breaker tripping and fan control circuit, relay control circuit, relay auxiliary contact detection circuit, high-voltage box temperature detection circuit, external wiring harness detection circuit, CAN communication circuit, Hall sensor power supply circuit, and high-voltage signal acquisition circuit. The DC-DC power supply circuit has functions such as input overcurrent / short circuit protection, transient pulse suppression protection, input reverse connection protection, and power supply status indication, and provides power to the connected circuits.

[0073] The control circuit is connected to the power input detection circuit, circuit breaker auxiliary contact detection circuit, circuit breaker tripping and fan control circuit, relay control circuit, relay auxiliary contact detection circuit, high-voltage box internal temperature detection circuit, external wiring harness detection circuit, CAN communication circuit, Hall sensor power supply circuit, and high-voltage signal acquisition circuit respectively; the control circuit controls and outputs the connected circuits according to the commands of the display screen.

[0074] The isolation voltage output circuit is connected to the input B+ / B- of the external high-voltage control box to provide the high-voltage battery analog input to the high-voltage control box. The high-voltage signal acquisition circuit is responsible for acquiring the high-voltage signal to determine whether the components in the high-voltage control box, such as fuses, circuit breakers, and relays, are working properly.

[0075] In practice, when testing the high-voltage control box of the energy storage battery under test, the test platform of the high-voltage control box system is powered on and in standby mode. The serial port display sends a start command to the test platform according to the test requirements. The test platform outputs simulated high-voltage voltage, relay control signal, and circuit breaker / fan control signal to the high-voltage control box system of the energy storage battery under test according to the control command. The high-voltage control box of the energy storage battery under test closes the corresponding relay / fan and Hall sensor power supply voltage. The test fixture platform simultaneously collects the corresponding level signal, analog signal, and high-voltage signal. By comparing the data, it is determined whether the high-voltage control box of the energy storage battery under test has the corresponding function or whether the corresponding wiring harness is connected correctly.

[0076] It is understandable that, through the above platform structure, this utility model can simulate the generation of high-voltage signals, generating a maximum 400VDC (adjustable, default 100V) DC voltage signal to the high-voltage circuit of the high-voltage control box of the energy storage battery under test, reducing the introduction of external high-voltage source equipment and lowering the testing cost.

[0077] The test fixture platform provided by this utility model constructs a multi-level power supply network through a DC-DC power supply circuit. The simulated battery voltage is injected into the high-voltage control box of the energy storage battery through the isolation voltage output circuit. The control circuit coordinates with the detection and control module to execute the action sequence of detection and control. Simultaneously, the feedback signal is collected through the high-voltage signal acquisition circuit, and finally the test result is output, forming a complete test closed loop of "power supply - signal excitation - data acquisition - threshold judgment - result feedback", which significantly improves the test efficiency.

[0078] Based on the above embodiments, Figure 2 This is a topology diagram of the DC-DC power supply circuit provided by this utility model, such as... Figure 2 As shown, the test fixture platform for the energy storage battery high-voltage control box system also includes:

[0079] A serial communication display circuit is provided, which is connected to the control circuit and is used to output the test results on the display screen.

[0080] In this embodiment of the invention, the serial communication display circuit is responsible for transmitting the test results generated by the test equipment or control system to the display screen via serial communication after processing by the control circuit, and presenting them in a visual format. Specifically, the serial communication display circuit is connected to the control circuit via a standard serial interface (such as RS-232, RS-485, etc.), and the interface specification ensures compatibility and communication stability between the two. During the test, relevant data is transmitted to the control circuit for real-time calculation and logical judgment, and the processed data is transmitted to the display circuit via the serial communication module. The display screen driver circuit converts the received data into a format and performs image processing before presenting it on the display screen in an intuitive way.

[0081] For example, the circuit can communicate with a 4.3-inch display. When the display is clicked, a start test command is issued, and the display and control circuit interact with each other to perform functional tests step by step.

[0082] Based on the above embodiments, Figure 3 This is a topology diagram of the DC-DC power supply circuit provided by this utility model, such as... Figure 3 As shown, the DC-DC power supply circuit includes:

[0083] A first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit;

[0084] The input terminal of the first voltage conversion circuit is connected to the DC power supply of the high voltage control box of the energy storage battery, and performs voltage conversion on the DC power supply;

[0085] The output terminal of the first voltage conversion circuit is connected to the second voltage conversion circuit and the third voltage conversion circuit respectively. The second voltage conversion circuit and the third voltage conversion circuit are used to adjust the voltage of the power supply after voltage conversion.

[0086] The DC-DC power supply circuit has functions such as input overcurrent / short circuit protection, transient pulse suppression protection, input reverse connection protection, and power supply status indication, and provides power to the connected circuits.

[0087] Specifically, the DC-DC power supply circuit includes a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit. The first voltage conversion circuit steps down the external DC 24V power supply of the high-voltage control box to 12V. The 12V power supply is then converted to 5V by the second voltage conversion circuit. The 5V power supply is then stepped down to 3.3V by the third voltage conversion circuit, supplying power to the corresponding chips in the control circuit, serial port display communication circuit, power input detection circuit, circuit breaker auxiliary contact detection circuit, circuit breaker tripping and fan control circuit, relay control circuit, relay auxiliary contact detection circuit, high-voltage box internal temperature detection circuit, external wiring harness detection circuit, CAN communication circuit, Hall sensor power supply circuit, and high-voltage signal acquisition circuit.

[0088] The external DC24V power supply also powers the 100V isolated voltage output circuit. When supplying the 100V isolated voltage, the DC24V is first converted to an isolated 12V power supply, and the isolated 12V is then converted to a 100V isolated voltage output via a DC-DC converter.

[0089] Based on the above embodiments, Figure 4 This is a topology diagram of the control circuit chip and reset circuit provided by this utility model, as shown below. Figure 4 As shown, the control circuit includes:

[0090] MCU circuit, reset circuit, and EEPROM circuit;

[0091] The MCU circuit is connected to the DC-DC power supply circuit, the isolation voltage output circuit, the detection and control module, the high-voltage signal sampling circuit, the reset circuit, and the EEPROM circuit, respectively.

[0092] The reset circuit is used to power-on reset the MCU circuit;

[0093] The EEPROM circuit is used to provide external data storage for the MCU circuit.

[0094] Specifically, the control circuit can actually include an MCU, an external clock circuit, a data storage circuit (EEPROM circuit), a serial-to-parallel shift circuit, a working status indicator circuit, and a power-on reset circuit (reset circuit). In this embodiment, the MCU uses STMicroelectronics' STM32F103RCT6 microcontroller chip, which outputs corresponding high and low levels through numerous I / O interfaces to control other onboard circuit modules. The external clock circuit provides clock information to the MCU; the data storage circuit provides backup external data storage for the MCU; the working status indicator circuit indicates the MCU's working status; and the power-on reset circuit performs a power-on detection and reset operation on the MCU to prevent damage.

[0095] Figure 5 This is a topology diagram of the isolation voltage output circuit provided by this utility model, as shown below. Figure 5 As shown, the high-voltage control box system of the energy storage battery under test needs to introduce an isolated high-voltage signal B+ / B-. The external DC 24V power supply is first connected to the isolated DC-DC module U20 through a reverse connection protection diode D37. U20 is a Mornsun URB2412S-6WR3G power module. U20 converts the 24V voltage to an isolated 12V voltage. After passing through the filter circuit, it enters the DC-DC module U19. U19 is a Mornsun HO1-P401V-5C power module. U19 converts the isolated 12V to an isolated 100-400V (default 100V) high-voltage signal output, which is connected to the B+ / B- of the high-voltage control box system of the energy storage battery under test through an external wiring harness.

[0096] Based on the above embodiments, Figure 6 This is a CAN communication circuit topology diagram provided by this utility model. Figure 7 This is a topology diagram of the Hall sensor power supply circuit provided by this utility model, as follows: Figure 6 and Figure 7 As shown,

[0097] The detection control module includes:

[0098] CAN communication circuit, Hall sensor power supply circuit, among which,

[0099] One end of the CAN communication circuit is connected to the Hall sensor in the high-voltage control box of the energy storage battery via CAN communication, and the other end is connected to the control circuit to determine whether the Hall sensor wiring harness and orientation are abnormal.

[0100] One end of the Hall sensor power supply circuit is connected to the DC-DC power supply circuit and the control circuit, and the other end is connected to the Hall sensor power supply harness of the high-voltage control box of the energy storage battery, for powering the Hall sensor.

[0101] The CAN communication circuit is connected to the CAN communication of the Hall sensor in the high-voltage control box of the energy storage battery under test. When the Hall sensor is working, it transmits data to the MCU of the control circuit. The MCU calculates the current Hall current from the data, thereby determining that the Hall sensor is working properly.

[0102] The Hall sensor power supply circuit is connected to the power supply pin of the Hall sensor in the high-voltage control box of the energy storage battery under test. The MCU of the control circuit outputs a high level so that the tooling platform can output 12V to the Hall sensor to enable it to work normally.

[0103] Specifically, the CAN communication circuit consists of the U13 CAN chip and peripheral circuitry. The CPUTXCAN / CPURXCAN pins of the control circuit are connected to pins 1 / 4 of the U13 chip via 51Ω resistors R52 and R54. The U13 chip (TJA1051T / 3,118) forwards data through pins 7 / 6 to communicate with the Hall sensor. C65 / C66 serve as filter capacitors for the CPUTXCAN / CPURXCAN pins, C67 serves as a filter capacitor for the CAN chip's power supply, and one end of capacitor C68 is connected to pin 5 of the CAN chip, with the other end grounded. L4 is connected in series between pins 7 / 6 of the CAN chip and 0H / 0L to provide common-mode filtering for the CAN data. Capacitors C69 / C70 and diode D14 are connected at one end to 0H / 0L and the other end grounded, primarily responsible for filtering and ESD protection. R50 / R51 is connected in series between 0H / 0L as terminating resistors.

[0104] Hall sensor power supply circuit topology diagram as follows Figure 7 As shown, the high-level output of the M_12V+ pin of control circuit 2 controls NPN transistor Q5 through resistors R21 and R24, turning on the collector and transmitter of Q5. One end of resistor R17 is grounded, and the other end of R17 is connected to the gate of P-MOS transistor Q4, one end of resistor R13 and capacitor C23. The U12V power supply is connected to the source of Q4, the other end of resistor R13 and capacitor C23. Due to the voltage division effect of the resistors, P-MOS transistor Q4 is turned on, and the U12V power supply flows from the source of P-MOS transistor Q4 to the drain, supplying power to the Hall sensor through the connector. One end of capacitor C24 / C25 is connected to the drain of P-MOS transistor Q4, and the other end is grounded, serving as a filter for the output power supply.

[0105] It is understood that the test platform provided by this utility model can be used in conjunction with a DC source to test the function of the Hall current sensor in the high-voltage control box, and can detect abnormalities in direction, communication, and power supply harness, thereby improving the overall test efficiency.

[0106] Based on the above embodiments, Figure 8 This is a topology diagram of the power input detection circuit provided by this utility model, as follows: Figure 8 As shown, the detection control module further includes:

[0107] A power input detection circuit is connected to the DC-DC power supply circuit and the control circuit. It is used to generate a small signal voltage from the input voltage of the DC-DC power supply circuit in the form of a series voltage divider and transmit it to the control circuit for voltage acquisition.

[0108] The power input detection circuit is connected to the DC-DC power supply circuit, and the other end is connected to the control circuit. The 24V voltage is divided by resistors to a small voltage signal (1-3V). The MCU of the control circuit collects the corresponding ADC value and feeds back the calculated voltage data to the display screen.

[0109] Specifically, the power input detection circuit of this utility model is powered by 24V. The 24V power signal PWRO+ is first filtered by capacitors C77 / C79, and then enters the series resistors R63 and R70 for voltage division. One end of R70 is grounded, and the MCU collects the level ADC signal on the other end of R70. When the input low voltage is 24V, the collected ADC voltage is 2.18V, and the current input voltage value is obtained by conversion.

[0110] Based on the above embodiments, Figure 9 This is the topology diagram of the circuit breaker auxiliary contact detection circuit provided by this utility model. Figure 10 This is a topology diagram of the circuit breaker tripping / fan control circuit provided by this utility model, as follows: Figure 9 and Figure 10 As shown,

[0111] The detection control module further includes:

[0112] Circuit breaker auxiliary contact detection circuit, circuit breaker tripping and fan control circuit;

[0113] The circuit breaker auxiliary contact detection circuit is connected to the control circuit and the circuit breaker auxiliary contacts in the energy storage battery high voltage control box, respectively, and is used to collect the high and low level changes of the auxiliary contacts.

[0114] One end of the circuit breaker tripping and fan control circuit is connected to the circuit breaker tripping control pin and the fan control pin of the energy storage battery high-voltage control box, and the other end is connected to the control circuit for collecting fan current.

[0115] The circuit breaker auxiliary contact detection circuit is connected to the circuit breaker auxiliary contact of the high-voltage control box system of the energy storage battery under test. When the circuit breaker is open, the auxiliary contact is at a low level. When the circuit breaker is closed, the auxiliary contact is at a high level. The MCU of the control circuit detects the high level signal and feeds the level signal back to the display screen.

[0116] The circuit breaker tripping and fan control circuit is connected to the negative control line of the circuit breaker / fan in the high-voltage control box of the energy storage battery under test. The MCU of the control circuit controls the negative control line of the circuit breaker / fan to be connected to the low-voltage negative terminal through the low-side drive chip, so as to realize the circuit breaker tripping and the fan rotation. At the same time, the MCU collects the current value of the fan to determine whether the fan is working normally.

[0117] The circuit topology diagram of the circuit breaker auxiliary contact detection circuit is as follows: Figure 9 As shown, the circuit breaker auxiliary contact signal DI6H is first filtered by capacitor C97, and then enters the series voltage divider resistors R125 / R126 to divide the signal. MCU_DI6H collects the high-level signal from resistor R126 as feedback for determining the circuit breaker's closing / opening function. Simultaneously, one end of capacitor C98 and Zener diode D33 is connected to MCU_DI6H, and the other end is grounded. This provides filtering and voltage regulation protection for MCU_DI6H.

[0118] The circuit breaker tripping and fan control circuit topology diagram is as follows: Figure 10 As shown, the M_V2- and M_DO6L pins in the control circuit are connected to pins 1 / 3 of the low-side driver chip U16 through 100Ω resistors R82 / R85, respectively, to control pins 8 / 5 of U16 (V2-) and DO6L to ground (V-), thereby realizing the tripping of the circuit breaker and the operation of the fan. At the same time, a small resistor is connected in series between DO6L and ground (V-) to realize the fan current acquisition function. DO6L passes through the filter capacitor C84 and enters the series voltage divider resistors R91 / R92 to divide the small voltage signal to ADC_DO6L. Meanwhile, one end of capacitor C85 and Zener diode D22 is connected to ADC_DO6L, and the other end is grounded, providing filtering and voltage regulation protection for ADC_DO6L.

[0119] Based on the above embodiments, Figure 11 This is a topology diagram of the relay control circuit provided by this utility model. Figure 12 This is a topology diagram of the relay auxiliary contact detection circuit provided by this utility model, as follows: Figure 11 and Figure 12 As shown,

[0120] The detection control module further includes:

[0121] The relay control circuit and the relay auxiliary contact detection circuit, among which,

[0122] One end of the relay control circuit is connected to the relay inside the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, which is used to control the closing and opening of the relay.

[0123] One end of the relay auxiliary contact detection circuit is connected to the relay auxiliary contact in the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, used to determine whether the relay auxiliary contact is normal.

[0124] The relay control circuit is connected to the positive control line of the main positive / precharge / main negative relay in the high-voltage control box of the energy storage battery under test. The MCU of the control circuit controls the positive control line of the relay to the low-voltage positive terminal through the high-side driver chip to realize the closing of the relay. At the same time, the high-voltage signal acquisition circuit is responsible for acquiring the voltage at the rear end of the relay to determine whether the relay is working normally.

[0125] The relay auxiliary contact detection circuit is connected to the auxiliary contacts of the main positive / main negative relays in the high-voltage control box of the energy storage battery under test. When the control relay is closed, the auxiliary contacts will open, and the MCU of the control circuit will change the low-level signal to a high-level signal to determine whether the auxiliary contact function is normal.

[0126] Specifically, the relay control circuit topology is as follows: Figure 11 As shown, the M_DO1H and M_DO2H pins in the control circuit are connected to pins 2 and 6 of the high-side driver chip U17 via 10kΩ resistors R97 / R102, respectively. The other end of resistors R97 / R102 is connected to 100kΩ resistors R96 / R103, and the other end of resistors R96 / R103 is grounded. This circuit ensures that the M_DO1H and M_DO2H pins are at a low level by default, thereby reducing the probability of malfunction. When the M_DO1H and M_DO2H pins are at a high level, the RLY_SUPPLY+ relay power supply is connected to the DO1H and DO2H pins, thereby controlling the main positive and pre-charge relays. Diodes D26 and D27 provide freewheeling protection for DO1H and DO2H, and resistors R105 / R106 and capacitors C90 / C91 provide voltage regulation and filtering protection for DO1H and DO2H.

[0127] Specifically, the topology diagram of the relay auxiliary contact detection circuit is as follows: Figure 12As shown, U12V is connected to the DI1L pin through a 5.1kΩ resistor R123. One end of DI1L is connected to capacitor C99 for filtering, and the other end goes into a series voltage divider resistor R127 / R129 to divide the signal into the MCU_DI1L signal. Simultaneously, capacitor C100 and one end of Zener diode D34 are connected to MCU_DI1L, and the other end is grounded, providing filtering and voltage regulation protection for MCU_DI1L. When the relay is closed, the DI1L pin is grounded, and MCU_DI1L is at a low level.

[0128] It is understood that the test platform provided by this utility model can simulate the battery management system controlling the relays in the high-voltage box to close or open, and determine whether the relays are functioning normally.

[0129] Based on the above embodiments, Figure 13 This is the topology diagram of the high-voltage box temperature detection circuit provided by this utility model. Figure 14 This is a topology diagram of the external wire harness detection circuit provided by this utility model, such as... Figure 13 and 14 As shown,

[0130] The detection control module further includes:

[0131] The high-voltage box contains an internal temperature detection circuit and an external wiring harness detection circuit.

[0132] One end of the temperature detection circuit inside the high-voltage box is connected to the temperature probe inside the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, used to detect and calculate the temperature value inside the box;

[0133] One end of the external wiring harness detection circuit is connected to the connector wiring harness on the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit, used to detect and determine whether there is any abnormality in the connector wiring harness.

[0134] The temperature detection circuit inside the high-voltage box is connected to the temperature probe inside the high-voltage control box of the energy storage battery under test. The MCU of the control circuit collects the corresponding ADC voltage signal, calculates the resistance value of the current temperature probe, and thus calculates the current temperature. The data is then uploaded to the display screen to determine if there are any abnormalities.

[0135] The external wiring harness detection circuit is connected to the inter-box connection harness of the high-voltage control box of the energy storage battery under test, including the display and control communication harness and the daisy-chain communication harness. First, a 12V voltage is applied to one end of the harness, and the harness is connected. After the connection is normal, the MCU of the control circuit determines whether the harness is working properly by acquiring the corresponding ADC voltage signal.

[0136] Specifically, the topology diagram of the temperature detection circuit inside the high-voltage box is as follows: Figure 13As shown, VCC_+3V3 is connected to the T0 pin through a 10kΩ resistor R55. T0 is an external temperature interface. One end of T0 is connected to a 1nF capacitor C72 for filtering, and the other end is connected to the ADC_T0 pin of the control circuit through the RC filter circuit R56 / C71. ADC_T0 is connected to a Schottky diode D15 for overvoltage protection. ADC_T0 collects the voltage signal and calculates the temperature resistance value of T0, and then calculates the current temperature.

[0137] External wire harness detection circuit topology diagram as follows Figure 14 As shown, U12V is connected to the IP1 pin through a 5.1kΩ resistor R115. ADC-IP1 uses the voltage signal on IP1 to determine if the external wiring harness of the high-voltage box is properly connected. When the wiring harness is correct, the control circuit controls the MCU_CT-2L pin to output a high level, turning on QA2. 2L is grounded through a 200Ω resistor R131. The IP1 pin is grounded through a series connection of resistors R118 / R119 / R120 / R121 / R122 / R131, forming a 1.2kΩ ground connection. At this time, the IP1 voltage is approximately 2.28V. After passing through the filter capacitor C95, the IP1 voltage is divided by resistors R116 / R117. ADC-IP1 measures the resistance on R117 as approximately 0.9V, indicating that the external wiring harness is normal.

[0138] It is understood that the testing platform provided by this utility model can detect whether the external connection harness of the high-voltage control box is abnormal, reduce the probability of after-sales repair risk, and improve the overall quality level.

[0139] Based on the above embodiments, the high-voltage signal sampling circuit includes:

[0140] Isolated SPI communication circuit, ADC acquisition circuit and high voltage signal acquisition circuit;

[0141] The high-voltage signal acquisition circuit transmits the high voltage to the ADC acquisition circuit through resistor voltage division.

[0142] The ADC acquisition circuit transmits the acquired data to the control circuit through the isolated SPI communication circuit.

[0143] The high-voltage signal acquisition circuit is connected to the high-voltage sampling harness of the high-voltage control box of the energy storage battery under test. The high-voltage signal acquisition circuit first divides the high voltage into a small voltage signal through a resistor and sends it to the ADC acquisition circuit. The ADC acquisition circuit transmits the acquired data to the control circuit through the isolated SPI communication circuit. The MCU of the control circuit compares and analyzes the calculated voltage to determine whether the high-voltage harness and components (relays, fuses) in the high-voltage box are working properly.

[0144] Specifically, the topology of the high-voltage signal acquisition circuit is as follows: Figure 15 As shown. The isolated power supply HV1_12V is first converted to isolated HV_5V through LDO chip U22, and isolated HV_5V is converted to isolated VDD_VT_+3V3 through LDO chip U23. Among them, HV_5V and VDD_VT_+3V3 supply power to the VCC2 pin of isolated communication chip U8 and ADC chip U21.

[0145] The high-voltage 100V HV+1 is divided and filtered by resistors R136 / R137 / R138 / R139 to generate a voltage signal ADC_HV+1 of approximately 0.97V. Pin 8 IN4 of ADC chip U21 is responsible for acquiring the analog signal ADC_HV+1 (U21 simultaneously acquires ADC_P+, ADC_P-, ADC_HV+2, and ADC_HV- signals, not fully shown), and transmits the calculated ADC value to the isolated communication chip U8 via SPI communication. The other end of U8 is connected to the SPI pin of the control circuit. The MCU of the control circuit calculates the communication data and compares it with the actual voltage to determine whether the relay is closed normally.

[0146] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0147] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0148] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A test fixture platform for a high-voltage control box system for energy storage batteries, characterized in that, include: The circuit consists of a DC-DC power supply circuit (1), a control circuit (2), an isolation voltage output circuit (3), a detection and control module (4), and a high-voltage signal sampling circuit (5), among which... The input terminal of the DC-DC power supply circuit (1) is connected to the DC power supply of the high voltage control box of the energy storage battery, and the output terminal of the DC-DC power supply circuit (1) is connected to the control circuit (2) and the isolation voltage output circuit (3) respectively. The isolation voltage output circuit (3) is connected to the total voltage input of the high voltage control box of the energy storage battery, and serves as the input high voltage source to provide an isolated high voltage signal to the high voltage signal sampling circuit (5); The control circuit (2) is connected to the detection control module (4) and the high-voltage signal sampling circuit (5) respectively, and is used to control the detection control module (4) to perform functional detection on the high-voltage control box of the energy storage battery and to control the high-voltage signal sampling circuit (5) to collect the voltage data of the high-voltage control box of the energy storage battery.

2. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 1, characterized in that, The test fixture platform for the energy storage battery high-voltage control box system also includes: A serial communication display circuit (15) is connected to the control circuit (2) and is used to output the test results on the display screen.

3. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 1, characterized in that, The DC-DC power supply circuit (1) includes: A first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; The input terminal of the first voltage conversion circuit is connected to the DC power supply of the high voltage control box of the energy storage battery, and performs voltage conversion on the DC power supply; The output terminal of the first voltage conversion circuit is connected to the second voltage conversion circuit and the third voltage conversion circuit respectively. The second voltage conversion circuit and the third voltage conversion circuit are used to adjust the voltage of the power supply after voltage conversion.

4. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 1, wherein the control circuit (2) comprises: MCU circuit, reset circuit, and EEPROM circuit; The MCU circuit is connected to the DC-DC power supply circuit, the isolation voltage output circuit, the detection and control module, the high-voltage signal sampling circuit, the reset circuit, and the EEPROM circuit, respectively. The reset circuit is used to power-on reset the MCU circuit; The EEPROM circuit is used to provide external data storage for the MCU circuit.

5. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 1, characterized in that, The detection control module (4) includes: CAN communication circuit (12), Hall sensor power supply circuit (13), wherein, One end of the CAN communication circuit (12) is connected to the Hall sensor in the high voltage control box of the energy storage battery via CAN communication, and the other end is connected to the control circuit (2) to determine whether the Hall sensor wiring harness and direction are abnormal. One end of the Hall sensor power supply circuit (13) is connected to the DC-DC power supply circuit (1) and the control circuit (2), and the other end is connected to the Hall sensor power supply harness of the high voltage control box of the energy storage battery, for powering the Hall sensor.

6. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 5, characterized in that, The detection control module (4) further includes: A power input detection circuit (14) is connected to the DC-DC power circuit (1) and the control circuit (2). The power input detection circuit (14) is used to transmit the input voltage of the DC-DC power circuit (1) to the control circuit (2) in the form of a series voltage divider to form a small signal voltage for voltage acquisition.

7. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 5, characterized in that, The detection control module (4) further includes: Circuit breaker auxiliary contact detection circuit (6) and circuit breaker tripping and fan control circuit (7); The circuit breaker auxiliary contact detection circuit (6) is connected to the control circuit (2) and the circuit breaker auxiliary contact in the energy storage battery high voltage control box, respectively, to collect the high and low level changes of the auxiliary contact; One end of the circuit breaker tripping and fan control circuit (7) is connected to the circuit breaker tripping control pin and the fan control pin of the high voltage control box of the energy storage battery, and the other end is connected to the control circuit (2) for collecting fan current.

8. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 5, characterized in that, The detection control module (4) further includes: The relay control circuit (8) and the relay auxiliary contact detection circuit (9) are included. One end of the relay control circuit (8) is connected to the relay in the high voltage control box of the energy storage battery, and the other end is connected to the control circuit (2) to control the closing and opening of the relay; One end of the relay auxiliary contact detection circuit (9) is connected to the relay auxiliary contact in the high voltage control box of the energy storage battery, and the other end is connected to the control circuit (2) to determine whether the relay auxiliary contact is normal.

9. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 5, characterized in that, The detection control module (4) further includes: The high-voltage box internal temperature detection circuit (10) and the external wiring harness detection circuit (11), wherein, One end of the high-voltage box temperature detection circuit (10) is connected to the temperature probe inside the high-voltage control box of the energy storage battery, and the other end is connected to the control circuit (2) for detecting and calculating the temperature value inside the box; One end of the external wiring harness detection circuit (11) is connected to the connector wiring harness on the high voltage control box of the energy storage battery, and the other end is connected to the control circuit (2) to detect and determine whether there is any abnormality in the connector wiring harness.

10. The test fixture platform for a high-voltage control box system for an energy storage battery according to claim 1, characterized in that, The high-voltage signal sampling circuit (5) includes: Isolated SPI communication circuit, ADC acquisition circuit and high voltage signal acquisition circuit; The high-voltage signal acquisition circuit transmits the high voltage to the ADC acquisition circuit through resistor voltage division. The ADC acquisition circuit transmits the acquired data to the control circuit through the isolated SPI communication circuit.

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