Simulation device and test equipment for output current signal of battery management system

Abstract

The utility model provides a simulation device and test equipment for a current signal output by a battery management system, and the device comprises an upper computer which is used for generating a voltage signal, a voltage signal simulator which is used for generating an analog voltage signal according to the voltage signal, and the battery management system which is used for generating a current signal according to the analog voltage signal. The upper computer is connected with the voltage signal simulator, and the voltage signal simulator is connected with the battery management system. The voltage signal simulator generates the analog voltage signal according to the structure of the voltage signal, so that the battery management system generates the corresponding current signal according to the analog voltage signal, the voltage signal simulator provides the low-voltage voltage signal, and the battery management system generates a large-current signal according to the low-voltage voltage signal. According to the simulation device, a low-voltage signal simulates a large current, the weight of a wire harness is greatly reduced, the wiring difficulty is reduced, and the electric shock risk of testers and the harm of electromagnetic radiation to human bodies are eliminated due to the absence of a large current source.

Description

Technical Field

[0001] The utility model relates to the field of battery management system testing, in particular to a simulation device and testing equipment for outputting current signals of a battery management system. Background Art

[0002] The power source of pure electric vehicles is the battery pack. The status of the battery pack is crucial to electric vehicles. The battery management system (BMS) is the "power battery steward". The battery management system uses a sophisticated control strategy to manage the battery pack, monitors the use status of the battery pack at all times, and avoids problems such as overcharging, over-discharging and thermal runaway of the battery pack, so as to ensure the reliability and safety of the power battery operation. The current signal output by the battery management system is an important factor in judging the battery management system. In actual operation, a current source is connected to both ends of the sampling resistor of the battery management system to simulate the normal current output signal; as the functions provided by the vehicle become more and more abundant, the output power of the battery management system also increases, making the output current value of the battery management system very large, resulting in the current transmission harness being very thick and heavy, which is not easy to install and will bring safety hazards to the staff on site.

[0003] Therefore, how to provide a simulation device that is easy to install and safe in the field for simulating and detecting the current signal output by the battery management system is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the utility model provides a simulation device and a test equipment for outputting a current signal of a battery management system to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0006] On the one hand, the present application provides a simulation device for outputting a current signal of a battery management system, the device comprising a host computer for generating a voltage signal, a voltage signal simulator for generating a simulated voltage signal based on the voltage signal, and a battery management system for generating a current signal based on the simulated voltage signal, the host computer being connected to the voltage signal simulator, and the voltage signal simulator being connected to the battery management system, wherein a sampling resistor is not provided in the battery management system.

[0007] In one embodiment of the present invention, the host computer is also connected to the battery management system.

[0008] In one embodiment of the utility model, the host computer is connected to the voltage signal simulator via a CAN line, the voltage signal simulator is connected to the battery management system via the CAN line, and the host computer is connected to the battery management system via the CAN line.

[0009] In one embodiment of the present invention, the battery management system includes an analog-to-digital converter and a processor, the voltage signal simulator is connected to the analog-to-digital converter, the analog-to-digital converter is connected to the processor, and the processor is connected to the host computer.

[0010] In one embodiment of the utility model, the host computer includes a signal generating unit, a data processing unit and an alarm unit, the signal generating unit is connected to the voltage signal simulator, the data processing unit is connected to the processor, and the alarm unit is connected to the data processing unit.

[0011] In an embodiment of the present invention, the voltage signal simulator is connected to the test system via the CAN line.

[0012] In an embodiment of the present invention, the voltage signal simulator includes two signal generation channels.

[0013] On the other hand, the present application further provides a testing device, which includes a simulation device for outputting a current signal of a battery management system as described above.

[0014] The present application provides a simulation device and test equipment for a battery management system to output a current signal. The device includes a host computer for generating a voltage signal, a voltage signal simulator for generating a simulated voltage signal according to the voltage signal, and a battery management system for generating a current signal according to the simulated voltage signal. The host computer is connected to the voltage signal simulator, and the voltage signal simulator is connected to the battery management system. The present application generates a simulated voltage signal according to the structure of the voltage signal itself through a voltage signal simulator, so that the battery management system generates a corresponding current signal according to the simulated voltage signal. The voltage signal simulator provides a low-voltage voltage signal, and the battery management system generates a high-current signal according to the low-voltage voltage signal. The simulation device realizes low-voltage signal simulation of high current, greatly reduces the weight of the wiring harness, reduces the difficulty of wiring, and eliminates the risk of electric shock to the tester and the harm of electromagnetic radiation to the human body due to the absence of a large current source.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0017] Figure 1 is a schematic diagram showing the connection between a high current source and a conventional battery management system according to an exemplary embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of a simulation device for outputting a current signal of a battery management system according to an exemplary embodiment of the present utility model;

[0019] Figure 3 is a schematic diagram of the overall connection of a simulation device shown in an exemplary embodiment of the present utility model;

[0020] Figure 4 It is a schematic diagram showing a voltage signal simulator connected to a battery management system that does not include a sampling resistor according to an exemplary embodiment of the present utility model;

[0021] Reference numeral: I 0 -current source, R1-sampling resistor, 210-host computer, 220-voltage signal simulator, 230-battery management system, ADC-analog-to-digital converter. DETAILED DESCRIPTION

[0022] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0024] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0025] CAN line, the full name of which is "Controller Area Network", is a serial communication protocol bus used for real-time applications.

[0026] The power source of pure electric vehicles is the battery pack. The status of the battery pack is crucial to electric vehicles. The Battery Management System (BMS) serves as the "power battery steward". The battery management system uses sophisticated control strategies to manage the battery pack, constantly monitors the usage status of the battery pack, and avoids problems such as overcharging, over-discharging, and thermal runaway, thereby ensuring the reliability and safety of the power battery operation.

[0027] In the battery management system, current acquisition is one of the core functions, which is responsible for monitoring the charge and discharge status of the battery and ensuring that the battery operates within a safe working range. Figure 1 As shown in the figure, the principle of current acquisition is usually based on the sampling resistor method, which measures the current by connecting a low-resistance sampling resistor R1 in series in the circuit. 0 When the current flows through the sampling resistor R1, according to Ohm's law (V = I 0 ×R1), a voltage drop proportional to the current will be generated at both ends of the sampling resistor R1. The battery management system collects the voltage drop value and calculates it through Ohm's law (I=V / R1) to obtain the current value. As the functions provided in the vehicle become more and more abundant, the output power of the battery management system increases, so that the output current of the battery management system is generally as high as 1000A, resulting in a very thick and heavy current transmission harness, which is not easy to install and will bring safety hazards to the staff on site.

[0028] To solve the above problems, Figure 2 As shown, the present application provides a simulation device for outputting a current signal of a battery management system, the device includes a host computer 210 for generating a voltage signal, a voltage signal simulator 220 for generating a simulated voltage signal according to the voltage signal, and a battery management system 230 for generating a current signal according to the simulated voltage signal, the host computer 210 is connected to the voltage signal simulator 220, the voltage signal simulator 220 is connected to the battery management system 230, wherein the sampling resistor R1 is not set in the battery management system 230.

[0029] In detail, Figure 3 As shown, the host computer 210 is also connected to the battery management system 230 .

[0030] In more detail, Figure 3 As shown, the host computer 210 is connected to the voltage signal simulator 220 via a CAN line, the voltage signal simulator 220 is connected to the battery management system 230 via a CAN line, and the battery management system 230 is connected to the host computer 210 via a CAN line.

[0031] In detail, the battery management system 230 includes an analog-to-digital converter ADC and a processor, the voltage signal simulator 220 is connected to the analog-to-digital converter ADC, the analog-to-digital converter ADC is connected to the processor, and the processor is connected to the host computer 210. Figure 4 As shown, the positive electrode of the voltage signal simulator 220 is connected to one end of the analog-to-digital converter ADC in the battery management system 230, and the positive electrode of the voltage signal simulator 220 is connected to the other end of the analog-to-digital converter in the battery management system 230, and the battery management system 230 has removed the sampling resistor. The analog-to-digital converter ADC is connected to the processor, and the processor is connected to the host computer 210 via the CAN line. The analog-to-digital converter can be an analog front end, and the analog-to-digital converter ADC is used to sample the analog voltage signal and convert the analog voltage signal into a digital signal. The processor processes the received digital signal and calculates the actual current signal.

[0032] In more detail, the host computer 210 includes a signal generating unit, a data processing unit and an alarm unit, the signal generating unit is connected to the voltage signal simulator 220, the data processing unit is connected to the processor, and the alarm unit is connected to the data processing unit. Specifically, the signal generating unit can be a signal generator, the signal generating unit is used to generate a voltage signal, the data processing unit can be a data processor, the data processing unit is used to determine the state of the battery management system according to the current signal and the preset current signal threshold, the alarm unit can be an audible and visual alarm, a buzzer, an audio alarm, etc., and the alarm unit generates alarm information according to the state of the battery management system.

[0033] In more detail, the voltage signal simulator 220 is connected to the test system via a CAN line, and no other connecting lines are required to connect the voltage signal simulator 220 and the test system, which simplifies the operation process.

[0034] In more detail, the voltage signal simulator 220 includes two signal generation channels. Specifically, a forward analog voltage signal and / or a reverse analog voltage signal is generated based on the voltage signal through the two signal generation channels, the host computer 210 sends a reverse voltage signal to the voltage signal simulator 220, the first signal generation channel of the voltage signal simulator 220 generates a reverse analog voltage signal, the host computer 210 sends a forward voltage signal to the voltage signal simulator 220, and the second signal generation channel of the voltage signal simulator 220 generates a forward analog voltage signal. Therefore, the voltage signal simulator 220 can generate a corresponding analog voltage signal according to the voltage signal sent by the host computer 210, and the voltage signal simulator 220 can generate a bidirectional voltage signal. Among them, the two signal generation channels of the voltage signal simulator 220 are the self-structure of the voltage signal simulator 220.

[0035] like Figures 2 to 4 As shown, the working principle of the simulation device for outputting current signals of the battery management system provided in this application is as follows:

[0036] The signal generating unit sends a voltage signal to the voltage signal simulator 220 through the CAN line. The voltage signal simulator 220 generates a corresponding analog voltage signal according to the voltage signal, and sends the analog voltage signal to the analog-to-digital converter ADC through the CAN line. The analog-to-digital converter ADC collects the analog voltage signal and converts the analog voltage signal into a digital signal. The processor processes the received digital signal and calculates the actual current signal. In the process of generating the current signal, since there is no sampling resistor, there is no need to use a large current source and a matching current harness, thereby reducing the difficulty of wiring. In addition, since there is no large current source, the risk of electric shock to the tester and the hazard of electromagnetic radiation are eliminated.

[0037] It should be noted that the battery management system 230 calculates the actual current signal based on its own structure, and the voltage signal simulator 220 generates the simulated voltage signal based on its own structure.

[0038] The data processing unit collects the current signal through the CAN line. The data processing unit determines the specific situation of the battery management system 230 according to the current signal and the preset current signal threshold. If the current signal is equal to the preset current signal threshold, the alarm unit determines that the battery management system is normal and does not generate an alarm message. If the current signal is not equal to the preset current signal threshold, the alarm unit determines that the battery management system is abnormal, generates an alarm message, and marks the battery management system 230 as abnormal. Among them, the monitoring and management of the current signal by the host computer 210 is realized according to its own structure.

[0039] Determination of the accuracy of the voltage signal simulator 220: In one embodiment, the resistance of the sampling resistor R1 in the battery management system 230 is 0.0001 ohms, and the current signal range of the battery management system 230 output is 1A to 1000A. According to Ohm's law, the analog voltage signal range corresponding to the voltage signal simulator 220 is 0.1mv to 100mv. Therefore, a voltage signal simulator with a range of 100mv is selected to ensure that the range accuracy of the voltage signal simulator 220 is optimal.

[0040] The voltage signal simulator can also be connected to the test system via a CAN line to provide test power for the test system.

[0041] The present application also provides a testing device, including a simulation device for a battery management system output current signal as described above, so as to facilitate testing of the output current of the battery management system.

[0042] The present application provides a simulation device and test equipment for a battery management system to output a current signal. The device includes a host computer for generating a voltage signal, a voltage signal simulator for generating a simulated voltage signal according to the voltage signal, and a battery management system for generating a current signal according to the simulated voltage signal. The host computer is connected to the voltage signal simulator, and the voltage signal simulator is connected to the battery management system. The present application generates a simulated voltage signal according to the structure of the voltage signal itself through a voltage signal simulator, so that the battery management system generates a corresponding current signal according to the simulated voltage signal. The voltage signal simulator generates a low-voltage simulated voltage signal, and the battery management system outputs a large current. The simulation device realizes low-voltage signal simulation of a large current, improves system safety, and greatly reduces the weight of the wiring harness and the difficulty of wiring. Since there is no large current source, the risk of electric shock to the tester and the harm of electromagnetic radiation to the human body are eliminated. The host computer, the voltage signal simulator and the battery management system are connected through a CAN line to achieve seamless connection and a simple connection relationship.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for simulating the output current signal of a battery management system, characterized in that: The device includes a host computer for generating a voltage signal, a voltage signal simulator for generating an analog voltage signal according to the voltage signal, and a battery management system for generating a current signal according to the analog voltage signal, wherein the host computer is connected to the voltage signal simulator, and the voltage signal simulator is connected to the battery management system, wherein no sampling resistor is provided in the battery management system.

2. The device for simulating the output current signal of a battery management system according to claim 1, characterized in that: The host computer is also connected to the battery management system.

3. The device for simulating the output current signal of the battery management system according to claim 2, characterized in that: The host computer is connected to the voltage signal simulator via a CAN line, the voltage signal simulator is connected to the battery management system via the CAN line, and the host computer is connected to the battery management system via the CAN line.

4. The device for simulating the output current signal of a battery management system according to claim 2, characterized in that: The battery management system includes an analog-to-digital converter and a processor. The voltage signal simulator is connected to the analog-to-digital converter, the analog-to-digital converter is connected to the processor, and the processor is connected to the host computer.

5. The device for simulating the output current signal of the battery management system according to claim 4, characterized in that: The host computer comprises a signal generating unit, a data processing unit and an alarm unit. The signal generating unit is connected to the voltage signal simulator, the data processing unit is connected to the processor, and the alarm unit is connected to the data processing unit.

6. The device for simulating the output current signal of a battery management system according to claim 3, characterized in that: The voltage signal simulator is connected to the test system via the CAN line.

7. The device for simulating the output current signal of a battery management system according to claim 1, characterized in that: The voltage signal simulator includes two signal generation channels.

8. A testing device, characterized in that: A device for simulating a current signal output by a battery management system as claimed in any one of claims 1 to 7.

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