Simulation test system, board card case and power battery monomer voltage simulation board card

Abstract

The utility model provides a simulation test system, a board card case and a power battery monomer voltage simulation board card, the power battery monomer voltage simulation board card comprises a monomer voltage simulation backboard and at least one monomer voltage simulation daughter board; the single voltage simulation backboard is provided with a first preset number of single voltage simulation daughter board slots, the single voltage simulation daughter boards are connected with the single voltage simulation backboard through the single voltage simulation daughter board slots, the single voltage simulation daughter boards can provide a second preset number of simulation channels, the first preset number is a positive integer greater than 1, and the second preset number is a positive integer greater than 1. The single voltage simulation backboard can be connected with a plurality of single voltage simulation daughter boards, and each single voltage simulation daughter board can provide a plurality of simulation channels, so that the problems that a backboard in an existing simulation board card can only integrate one daughter board, and a single channel occupies a large installation area of a cabinet, so that the number of simulation channels which can be integrated in a unit space is too small are solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a simulation test system, a board chassis, and a power battery cell voltage simulation board. Background Art

[0002] As the driving range and charging speed of electric vehicles continue to improve, the number of power battery cells continues to increase, and the maximum voltage of the battery pack can reach 1500V. This requires the simulation test system to have more single-cell battery simulation channels while ensuring better real-time performance.

[0003] The current simulation test system mainly consists of two forms: bidirectional programmable power supply and dedicated simulation board. Among them, the bidirectional programmable power supply is equivalent to a programmable power supply that integrates multiple bidirectional power channels, which can be controlled through communication interfaces such as Ethernet, RS485 or CAN bus; while the dedicated simulation board simulates the voltage and current of the single battery by controlling the analog circuit and amplification circuit for the controller, and is controlled through communication interfaces such as RS485 or CAN bus.

[0004] Bidirectional programmable power supplies and dedicated simulation boards can be integrated into a 19-inch rack box or desktop chassis to facilitate various applications; however, the backplane in the simulation board can only integrate one daughter board, and a single channel occupies a large cabinet installation area, resulting in too few simulation channels that can be integrated in a unit space. Utility Model Content

[0005] In this regard, the present application provides a simulation test system, a board chassis, and a power battery cell voltage simulation board to solve the problem that the backplane in the existing simulation board can only integrate one sub-board, and a single channel occupies a large cabinet installation area, resulting in too few simulation channels that can be integrated in a unit space.

[0006] To achieve the above objectives, the present application provides the following technical solutions:

[0007] The first aspect of the present application discloses a power battery cell voltage simulation board, comprising: a cell voltage simulation backplane and at least one cell voltage simulation daughter board;

[0008] The single cell voltage simulation backplane is provided with a first preset number of single cell voltage simulation daughter board slots, the single cell voltage simulation daughter board is connected to the single cell voltage simulation backplane via the single cell voltage simulation daughter board slots, the single cell voltage simulation daughter board can provide a second preset number of simulation channels, and the first preset number is a positive integer greater than 1.

[0009] Optionally, in the above-mentioned power battery cell voltage simulation board, the cell voltage simulation sub-board integrates an electrical fault injection circuit, and the electrical fault injection circuit is used to realize an open circuit electrical fault, and the open circuit electrical fault includes at least one of the following: sampling line open circuit, sampling line short circuit, and polarity reversal.

[0010] Optionally, in the above-mentioned power battery single cell voltage simulation board, the single cell voltage simulation backplane is connected to the single cell voltage simulation daughter board through a European connector.

[0011] Optionally, in the above-mentioned power battery cell voltage simulation board, the cell voltage simulation backplane includes: a field programmable logic gate array module, a power supply circuit, a fan control circuit and a high-speed serial computer expansion bus circuit;

[0012] The field programmable logic gate array module is respectively connected to the power supply circuit, the fan control circuit and the high-speed serial computer expansion bus circuit.

[0013] Optionally, in the above-mentioned power battery cell voltage simulation board, the second preset number is 4, and the cell voltage simulation sub-board includes: 4 battery simulation circuits, each of the battery simulation circuits is connected to the field programmable logic gate array module through its own relay, and the total voltage cascade and compensation cascade are between the battery simulation circuits.

[0014] Optionally, in the above-mentioned power battery cell voltage simulation board, signals connecting the battery simulation circuit and the field programmable logic gate array module are connected through a magnetic isolation chip.

[0015] Optionally, in the above-mentioned power battery cell voltage simulation board, the first preset number is 10.

[0016] The second aspect of the present application discloses a board chassis, comprising: a power supply, a cooling fan, and a power battery cell voltage simulation board as disclosed in the first aspect;

[0017] The power supply is connected to a power circuit in the power battery cell voltage simulation board, and the cooling fan is connected to a fan control circuit in the power battery cell voltage simulation board.

[0018] The third aspect of the present application discloses a simulation test system, the simulation test system comprising: a host computer, a real-time simulation computer and the board chassis disclosed in the second aspect;

[0019] The real-time simulation computer and the board chassis are respectively connected to the BMS controller under test;

[0020] The real-time simulation computer is also connected to the host computer and the board chassis respectively;

[0021] Alternatively, the simulation test system comprises: a test computer and the board chassis as disclosed in the second aspect;

[0022] The test computer and the board chassis are respectively connected to the BMS controller under test;

[0023] The test computer is also connected to the board chassis.

[0024] Optionally, in the above-mentioned simulation test system, a high-speed serial computer expansion bus is used for communication between the real-time simulation computer and the board chassis, and between the test computer and the board chassis.

[0025] The power battery cell voltage simulation board provided in the present application includes: a cell voltage simulation backplane and at least one cell voltage simulation sub-board; the cell voltage simulation backplane is provided with a first preset number of cell voltage simulation sub-board slots, the cell voltage simulation sub-board is connected to the cell voltage simulation backplane via the cell voltage simulation sub-board slots, the cell voltage simulation sub-board can provide a second preset number of simulation channels, the first preset number is a positive integer greater than 1, since the cell voltage simulation backplane can be connected to multiple cell voltage simulation sub-boards, each cell voltage simulation sub-board can provide multiple simulation channels, which solves the problem that the backplane in the existing simulation board can only integrate one sub-board, and a single channel occupies a large cabinet installation area, resulting in too few simulation channels that can be integrated in a unit space. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of a power battery cell voltage simulation board provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a single voltage simulation backplane provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of a connection interface between a single-cell voltage simulation backplane and a single-cell voltage simulation daughterboard provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of a power supply circuit for a single-cell voltage simulation backplane provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a single voltage simulation sub-board provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of a battery simulation circuit provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of a board chassis provided in an embodiment of the present application;

[0034] Figure 8 and Fig. 9 A schematic diagram of the structures of two simulation test systems provided in the embodiments of the present application. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] An embodiment of the present application provides a power battery cell voltage simulation board to solve the problem that the backplane in the existing simulation board can only integrate one sub-board, and a single channel occupies a large cabinet installation area, resulting in too few simulation channels that can be integrated in a unit space.

[0037] See also Figure 1 , the power battery single cell voltage simulation board mainly includes: a single cell voltage simulation backplane and at least one single cell voltage simulation sub-board;

[0038] The single-cell voltage simulation backplane is provided with a first preset number of single-cell voltage simulation daughter board slots. The single-cell voltage simulation daughter board is connected to the single-cell voltage simulation backplane via the single-cell voltage simulation daughter board slots. The single-cell voltage simulation daughter board can provide a second preset number of simulation channels. The first preset number is a positive integer greater than 1.

[0039] In practical applications, the specific value of the first preset number may be 10, that is, a single voltage simulation backplane may provide slots for 10 single voltage simulation daughter boards, and may integrate 10 single voltage simulation daughter boards.

[0040] In specific applications, such as Figure 2As shown, taking n=10 as an example, the single voltage simulation backplane may include: a field programmable logic gate array module, a power supply circuit, a fan control circuit and a high-speed serial computer expansion bus (Peripheral Component Interconnect Express, PCIe) circuit. The field programmable logic gate array module is connected to the power supply circuit, the fan control circuit and the high-speed serial computer expansion bus circuit respectively.

[0041] In practical applications, field programmable gate array modules are mainly composed of FPGA chips.

[0042] It should be noted that the single cell voltage simulation backplane realizes the control of the single cell simulation sub-board, the control of the fan, and the real-time communication of the simulation test system by integrating the field programmable logic gate array module and the peripheral circuit; at the same time, it realizes the functions of LED indicator control, etc. Among them, the peripheral circuit at least includes: power supply circuit, fan control circuit and high-speed serial computer expansion bus circuit.

[0043] The single cell voltage simulation backplane can be set with 10 expansion slots, each of which can be inserted with a single cell voltage simulation daughter board. The single cell voltage simulation backplane is mainly used for the installation and electrical connection of the single cell voltage simulation daughter board, controls the output voltage and current signals of the single cell voltage simulation daughter board, and supplies power to the board chassis fan. The high-speed serial computer expansion bus circuit in the single cell voltage simulation backplane can provide a high communication bandwidth for the power battery single cell voltage simulation board card, and realize the real-time monitoring and monitoring of the power battery single cell voltage simulation board card.

[0044] In some embodiments, the single-cell voltage simulation backplane can be connected to the single-cell voltage simulation daughter board through a European connector; of course, it is not limited to this, and can also be determined according to the application environment and user needs. This application does not make specific limitations and is within the protection scope of this application.

[0045] Specifically, the front panel of the single-cell voltage simulation daughter board can provide a directly connected Phoenix connector, taking into account the shortest signal connection and debugging test.

[0046] Combination Figure 3 When the single-cell voltage simulation backplane can be connected to the single-cell voltage simulation daughter board through the European connector, each single-cell voltage simulation daughter board slot can be arranged with communication interfaces such as I2C (Inter-Integrated Circuit) and SPI (Serial Peripheral Interface), and also provides conventional digital IO signals for realizing the configuration and status monitoring of the single-cell voltage simulation daughter board.

[0047] Specifically, the single voltage simulation backplane can also realize the distribution of 24V power supply, which is used to power the cooling fans of the field programmable logic gate array module, the single voltage simulation sub-board and the power battery single voltage simulation board. The 3.3V, 2.5V, 1.8V, 1.2V and other chip power supplies required by the FPGA chip in the field programmable logic gate array module are respectively realized by the power supply chip in the power supply circuit of the single voltage simulation backplane. The structural diagram can be shown as follows: Figure 4 shown.

[0048] In practical applications, the second preset number may be 4, that is, one single voltage simulation daughter board may provide four 5V, 1A simulation channels.

[0049] In some embodiments, Figure 5 As shown, when the second preset number is 4, the single cell voltage simulation sub-board may include: 4 battery simulation circuits (CH1, CH2, CH3, CH4 in the figure), each battery simulation circuit is connected to the field programmable logic gate array module through its own relay, and the total voltage cascade and compensation cascade are between the battery simulation circuits.

[0050] In actual applications, the single cell voltage simulation daughter board can obtain interface signals such as voltage control, current control, voltage acquisition and current acquisition through the field programmable logic gate array module in the single cell voltage simulation backplane, and then generate voltage and current signals (Vn+ / Vn-) through the battery simulation circuit. At the same time, the output of each module is monitored through the Sn+ / Sn- port of the battery simulation circuit to perform voltage compensation and improve the voltage simulation accuracy.

[0051] The schematic diagram of the battery simulation circuit can be shown as Figure 6 As shown, the voltage control signal obtained from the FPGA chip outputs a voltage signal through the DAC, and is output from the V+ port / V- port after two-stage signal amplification and power amplification. The current control signal is output through another DAC output signal, and after amplification, it controls the voltage-controlled constant current source to realize current simulation. During the operation of the power battery cell voltage simulation board, the power battery cell voltage simulation board collects the voltage signal representing the current size through the sampling resistor, and feeds it back to the FPGA chip through the ADC, so that the simulated working voltage signal directly passes through the instrument amplifier (Instrument Amplifier in the figure), and is sampled by another ADC and fed back to the FPGA chip. All signals connected to the FPGA chip are connected through a magnetic isolation chip to ensure the isolation of the FPGA chip signal and the simulation signal, that is, the signals connected to the battery simulation circuit and the field programmable logic gate array module are connected through a magnetic isolation chip. Among them, in the default state Figure 6 The relay in the circuit is connected to both ends of a 0.2Ω resistor and is switched to both ends of a 150Ω resistor when the collected current is particularly small.

[0052] It should be noted that the single voltage simulation sub-board can integrate an electrical fault injection circuit, and the electrical fault injection circuit is used to realize an open circuit electrical fault. Among them, the open circuit electrical fault can include at least one of the following: a sampling line open circuit, a sampling line short circuit, and a polarity reversal. Figure 5 The right side of the figure is the fault injection principle circuit. The open circuit fault injection can be achieved by controlling the opening and closing of the relay through the FPGA chip. The relay of this power battery cell voltage simulation board is a normally closed relay.

[0053] Combination Figure 5 The sampling line open circuit can be realized by disconnecting the relay, the sampling line short circuit can be realized by outputting the simulation channel to zero, and the polarity reversal can be realized by outputting a negative voltage.

[0054] Based on the above principles, the power battery cell voltage simulation board provided in this embodiment includes: a cell voltage simulation backplane and at least one cell voltage simulation sub-board; the cell voltage simulation backplane is provided with a first preset number of cell voltage simulation sub-board slots, the cell voltage simulation sub-board is connected to the cell voltage simulation backplane through the cell voltage simulation sub-board slots, and the cell voltage simulation sub-board can provide a second preset number of simulation channels, and the first preset number is a positive integer greater than 1. Since the cell voltage simulation backplane can be connected to multiple cell voltage simulation sub-boards, each cell voltage simulation sub-board can provide multiple simulation channels, which solves the problem that the backplane in the existing simulation board can only integrate one sub-board, and a single channel occupies a large cabinet installation area, resulting in too few simulation channels that can be integrated in a unit space. In addition, the cell voltage simulation sub-board also integrates an electrical fault injection circuit, which eliminates the wiring between the power battery cell voltage simulation board and the fault injection hardware, thereby shortening the signal wiring and improving the signal simulation accuracy.

[0055] Based on the power battery cell voltage simulation board provided in the above embodiment, optionally, another embodiment of the present application further provides a board chassis, such as Figure 7 As shown, the board chassis mainly includes: a power supply, a cooling fan and a power battery cell voltage simulation board as described in any of the above embodiments;

[0056] The power supply is connected to a power circuit in a power battery cell voltage simulation board, and the cooling fan is connected to a fan control circuit in a power battery cell voltage simulation board.

[0057] Specifically, the power supply is connected to the field programmable logic gate array module through the power circuit in the power battery cell voltage simulation board; the cooling fan is connected to the field programmable logic gate array module through the fan control circuit in the power battery cell voltage simulation board.

[0058] It should be noted that the board chassis can be integrated into a 19-inch rack chassis or a desktop chassis to facilitate various applications.

[0059] In this embodiment, since the power battery single cell voltage simulation board can integrate multiple single cell voltage simulation sub-boards, on the basis of solving the problem that the backplane in the existing simulation board can only integrate one sub-board, and a single channel occupies a large cabinet installation area, resulting in too few simulation channels that can be integrated in a unit space, through compact integrated design and heat dissipation and ventilation design, the size of the equipment is greatly reduced, the cumbersomeness of the equipment use is reduced, the good reliability of the equipment is ensured, and the cost is reduced.

[0060] Based on the board chassis provided in the above embodiment, optionally, another embodiment of the present application further provides a simulation test system, see Figure 8 The simulation test system may include: a host computer, a real-time simulation computer, and a board chassis as described in any of the above embodiments; wherein the real-time simulation computer and the board chassis are respectively connected to a BMS (BATTERY MANAGEMENT SYSTEM) controller under test; and the real-time simulation computer is also respectively connected to the host computer and the board chassis.

[0061] Or, if Fig. 9 As shown, the simulation test system may include: a test computer and a board chassis as described in any of the above embodiments; wherein the test computer and the board chassis are respectively connected to the BMS controller under test; and the test computer is also connected to the board chassis.

[0062] In practical applications, high-speed serial computer expansion buses are used for communication between the real-time simulation computer and the board chassis, and between the test computer and the board chassis. Specifically, high-speed serial computer expansion buses are used for communication between the real-time simulation computer and the single cell voltage simulation backplane in the power battery single cell voltage simulation board; high-speed serial computer expansion buses are used for communication between the test computer and the single cell voltage simulation backplane in the power battery single cell voltage simulation board.

[0063] When the simulation test system includes a host computer, a real-time simulation computer, and a board chassis as described in any of the above embodiments, a real-time simulation application mode can be realized. In the real-time simulation application mode, the power battery cell voltage simulation board is used to expand the simulation function of the power battery cell voltage signal that the real-time simulation computer cannot realize. The real-time simulation computer and the board chassis can interact through a high-speed serial computer expansion bus. The power battery cell voltage simulation board obtains control signals in real time through the high-speed serial computer expansion bus, thereby simulating the charging and discharging voltages and currents of different cells. At the same time, the actual state of the sensor simulation is transmitted back to the real-time simulation test system for closed-loop simulation.

[0064] When the simulation test system includes a test computer and a board chassis as described in any of the above embodiments, a performance test mode can be implemented. In the performance test mode, the power battery cell voltage simulation board can obtain the control signal of the test computer through the high-speed serial computer expansion bus, thereby simulating the charge and discharge voltage and current of different cells. The performance test mode is mainly used in the fields of BMS production offline detection and aging test, and the application scenario is non-real-time application occasions.

[0065] In this embodiment, since the computer in the simulation test system communicates with the board chassis through a high-speed serial computer expansion bus, compared to the existing communication using control interfaces such as Ethernet, RS485 or CAN bus with lower baud rates and smaller data throughput, the simulation test system provided by the present application can achieve strong real-time performance when realizing large-scale single-cell voltage channel simulation in real-time simulation applications, thereby laying a good foundation for BMS simulation testing with long driving range and realizing simulation of high dynamic working conditions.

[0066] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0067] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0069] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A power battery cell voltage simulation board, It is characterized in that include: A single cell voltage emulation backplane and at least one single cell voltage emulation daughterboard; The single cell voltage simulation backplane is provided with a first preset number of single cell voltage simulation daughter board slots, the single cell voltage simulation daughter board is connected to the single cell voltage simulation backplane via the single cell voltage simulation daughter board slots, the single cell voltage simulation daughter board can provide a second preset number of simulation channels, and the first preset number is a positive integer greater than 1.

2. The power battery cell voltage simulation board according to claim 1, It is characterized in that The single voltage simulation daughter board integrates an electrical fault injection circuit, and the electrical fault injection circuit is used to realize an open circuit electrical fault, and the open circuit electrical fault includes at least one of the following: a sampling line open circuit, a sampling line short circuit, and a polarity reversal.

3. The power battery cell voltage simulation board according to claim 1, It is characterized in that The single-cell voltage simulation backplane is connected to the single-cell voltage simulation daughter board via a European connector.

4. The power battery cell voltage simulation board according to claim 1, It is characterized in that The single voltage simulation backplane includes: a field programmable logic gate array module, a power supply circuit, a fan control circuit and a high-speed serial computer expansion bus circuit; The field programmable logic gate array module is respectively connected to the power supply circuit, the fan control circuit and the high-speed serial computer expansion bus circuit.

5. The power battery cell voltage simulation board according to claim 4, It is characterized in that The second preset number is 4, and the single cell voltage simulation sub-board includes: 4 battery simulation circuits, each of which is connected to the field programmable logic gate array module through its own relay, and the total voltage cascade and compensation cascade are between the battery simulation circuits.

6. The power battery cell voltage simulation board according to claim 5, It is characterized in that Signals for connecting the battery simulation circuit to the field programmable logic gate array module are connected via a magnetic isolation chip.

7. The power battery cell voltage simulation board according to any one of claims 1 to 6, It is characterized in that The first preset number is 10.

8. A board chassis, It is characterized in that include: A power supply, a cooling fan and a power battery cell voltage simulation board as claimed in any one of claims 1 to 7; The power supply is connected to a power circuit in the power battery cell voltage simulation board, and the cooling fan is connected to a fan control circuit in the power battery cell voltage simulation board.

9. A simulation test system, It is characterized in that The simulation test system comprises: a host computer, a real-time simulation computer and the board chassis as claimed in claim 8; The real-time simulation computer and the board chassis are respectively connected to the BMS controller under test; The real-time simulation computer is also connected to the host computer and the board chassis respectively; Alternatively, the simulation test system comprises: a test computer and the board chassis as claimed in claim 8; The test computer and the board chassis are respectively connected to the BMS controller under test; The test computer is also connected to the board chassis.

10. The simulation test system according to claim 9, It is characterized in that The real-time simulation computer and the board chassis, and the test computer and the board chassis all communicate using a high-speed serial computer expansion bus.

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