CN211785824U

CN211785824U - Hardware in-loop test system for battery management system

Info

Publication number: CN211785824U
Application number: CN201921819089.9U
Authority: CN
Inventors: 陈乐�; 姜明虎; 费博
Original assignee: Hefei Pengpai Energy Technology Co ltd
Current assignee: Hefei Pengpai Energy Technology Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-10-27
Anticipated expiration: 2029-10-25

Abstract

The utility model discloses embodiment provides an at ring test system towards battery management system's hardware belongs to battery management system's test technical field. The in-loop test system includes: the battery management system comprises an analog battery unit, a battery management unit and a battery management unit, wherein the analog battery unit is used for outputting different analog battery signals to the battery management system; the high-voltage output unit is connected with the analog battery unit and is used for outputting a high-voltage signal to the analog battery unit; the controllable power supply is used for outputting an analog Hall sensor signal to the battery management system; and the hardware-in-loop detection module is connected with the high-voltage output unit and the controllable power supply, and is used for acquiring the state of the battery management system through the battery management system and generating a control instruction for controlling the high-voltage output unit and the controllable power supply according to the state. The in-loop test system can test the charge and discharge performance of the battery management system, so that the safe operation of the battery management system is ensured.

Description

Hardware in-loop test system for battery management system

Technical Field

The utility model relates to a battery management system's test technical field specifically relates to an at ring test system towards battery management system's hardware.

Background

With the development of the times, the living conditions of people are improved, and the automobile industry is developed at a high speed in recent years due to the improvement of the living conditions. For energy saving and emission reduction, battery automobiles are beginning to appear, and have been greatly developed in the past decade.

Due to the popularization of new energy automobiles, the safety of important battery parts of new energy automobiles is concerned widely, and therefore, a battery management system is generated accordingly and is an important dependence for guaranteeing the charging of batteries, and the safety test of the battery management system is also very important.

The existing Battery Management System (BMS) hardware-in-loop test System depends on large-scale charging and discharging equipment, and the test System has high cost and cannot be moved. The battery management system monitoring software of the system communicates with the battery management system through CAN equipment or RS485 equipment, and reads the information of the battery management system; the system software sends commands to the battery management system to complete the control of the battery management system relay, sends the commands in the designated information, and completes the functions of parameter calibration, program updating and the like of the battery management system. In addition, in the prior art, the battery management system monitoring software and the charging and discharging hardware in-loop test equipment control software are mutually independent and inconvenient to use.

The system can only read the information of the battery management system, cannot test the charging function, the discharging function and the simulation test function of each charging stage of the battery management system, and cannot judge whether each function of the battery management system is normal.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an at ring test system towards battery management system's hardware, this system can test battery management system's charge-discharge performance to guarantee battery management system's safe work.

In order to achieve the above object, the present invention provides a system for testing hardware in a ring facing a BMS, the system comprising:

the battery management system comprises an analog battery unit, a battery management unit and a battery management unit, wherein the analog battery unit is used for outputting different analog battery signals to the battery management system;

the high-voltage output unit is connected with the analog battery unit and is used for outputting a high-voltage signal to the analog battery unit;

the controllable power supply is used for outputting an analog Hall sensor signal to the battery management system;

and the hardware-in-loop detection module is connected with the high-voltage output unit and the controllable power supply, and is used for acquiring the state of the battery management system through the battery management system and generating a control instruction for controlling the high-voltage output unit and the controllable power supply according to the state.

Optionally, the hardware-in-the-loop detection module further includes:

and the information acquisition unit is used for establishing information interaction with the battery management system to acquire the state.

Optionally, the hardware-in-the-loop detection module further includes:

and the information processing unit is connected with the information acquisition unit and used for processing according to the state to obtain the control instruction.

Optionally, the hardware-in-loop test module further includes:

and the high-voltage control unit is connected with the information processing unit and the high-voltage output unit and is used for controlling the high-voltage output unit according to the control instruction.

Optionally, the hardware-in-loop test module further includes:

and the power supply control unit is connected with the high-voltage control unit and the controllable power supply and is used for receiving the control instruction of the high-voltage control unit and controlling the controllable power supply.

Optionally, the information acquisition unit is connected to the battery management system through a CAN communication line.

Optionally, the high voltage control unit is connected to the high voltage output unit through an RS485 device.

Through the technical scheme, the utility model provides an at ring test system towards battery management system's hardware is through adopting the battery output of simulation battery unit to the different models of battery management system output to adopt the host computer unit to carry out the analysis to BMS real-time processing's process, realized the test to battery management system charge-discharge monitoring function, ensured that battery management system can work safely.

Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:

fig. 1 is a block diagram of a system for BMS-oriented hardware-in-the-loop testing according to an embodiment of the present invention;

fig. 2 is a block diagram of a system for hardware-in-the-loop test for BMS according to an embodiment of the present invention.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is merely for purposes of illustration and explanation and is not intended to limit the embodiments of the present invention.

In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship between the components in the vertical, or gravitational direction.

In addition, if there is a description in the embodiments of the present invention referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments can be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or can not be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 is a block diagram illustrating an in-loop test system for hardware of a battery management system according to an embodiment of the present invention. In fig. 1, the in-loop test system may include an analog battery cell 21, a high voltage output unit 22, a controllable power supply 23, and a hardware-in-loop detection module 30.

The analog battery unit 21 may be used to output different analog battery signals to the battery management system 10, so as to simulate charging and discharging signals of different types of batteries to the battery management system.

The high voltage output unit 22 may be connected to the analog battery cell 21 for outputting a high voltage signal to the analog battery cell 21. The high voltage signal may be the operating voltage of the analog battery cell 21. Accordingly, the analog battery unit 21 can divide the high voltage signal into different voltage signals based on the principle of resistance voltage division to form charge and discharge signals of different types of batteries. In one example of the present invention, the analog battery unit 21 can simulate the high voltage signal into 12 different types of analog battery signals.

The controllable power supply 23 may be used to output an analog hall sensor signal to the battery management system 10, thereby simulating a different pickup current to the battery management system 10. As for the manner in which the battery management system 10 collects the current, it may be, for example, a current value calculated according to formula (1),

where Uc is the input voltage of the analog hall sensor. In this example, the input voltage is 5V. Vout is the output voltage, V0 is the reference voltage (2.5V), and G is the sensitivity of the analog Hall sensor. When the loop test system is used for analog charging or discharging, the value of Vout can be calculated according to the known information such as I, Uc, V0, G, etc. through the formula (1), and then sent to the controllable power supply 23 through the RS485 device, so that the controllable power supply 23 outputs a corresponding current, and the battery management system 10 can read a required current value.

The hardware-in-the-loop detection module may be connected to the high-voltage output unit 22 and the controllable power supply 23, and is configured to acquire a state of the battery management system 10 through the battery management system 10, and generate a control instruction for controlling the high-voltage output unit 22 and the controllable power supply 23 according to the state.

In an embodiment of the present invention, the hardware-in-loop test module, as shown in fig. 2, may include an information acquisition unit 31, an information processing unit 32, a high voltage control unit 33, and a power control unit 34.

The information acquisition unit 31 may be used to establish information interaction with the battery management system 10 to obtain its status. The state may include parameters of the battery management system, such as cell voltage, battery charging/discharging current, battery temperature, and battery state of charge. Meanwhile, in order to facilitate the operation of the staff and the man-machine interaction, the information acquisition unit 31 may further include a corresponding display device, so that the information can be displayed to the staff, and when a fault occurs, an alarm may be given to the staff through the display device.

An information processing unit 32 may be connected to the information collecting unit 31 for processing to obtain control instructions according to the state of the battery management system 10. Specifically, the information processing unit 32 may classify and identify the message of the battery management system 10 based on an ecu (electronic Control unit) calibration protocol of the CAN bus, so as to obtain a corresponding Control instruction.

The high voltage control unit 33 may be connected with the information processing unit 32, the high voltage output unit 22, and the power control unit 34, for controlling the high voltage output unit 22 and the power control unit 34 according to control instructions. The power control unit 34 may be configured to receive a control command from the control unit 32 and control the controllable power supply to output different analog hall sensor signals based on the command.

In addition, in order to facilitate instant and stable communication of the devices, the information collecting unit 31 may be connected to the battery management system 10 through a CAN communication line. The high voltage control unit 33 may be connected to the high voltage output unit 22 through an RS485 device.

In this embodiment, the specific workflow of the in-loop test system can be determined by those skilled in the art based on the above technical solution and the specific function to be actually tested. In one example of the present invention, the workflow may be, for example:

the information acquisition unit 31 may read SOC and current information of the battery management system 10 through the CAN device. Calculating the voltage of the single battery identified by the battery management system according to the formula (2),

wherein, K1, K2, K3, K4, K5, K6 and K7 are preset weight values, and V, I and R are detected voltage, current and resistance.

In testing the charging function of the battery management system 10, taking into account the characteristics of the battery management system 10 itself at the time of charge management, namely: when the acquired voltage of the single battery is less than or equal to U1, the charging current is I1; when the acquired voltage of the single battery is greater than U1 and less than or equal to U2, the charging current is I2; when the acquired voltage of the single battery is greater than U2 and less than or equal to U3, the charging current is I3; when the collected single battery voltage is greater than U3, the charging current is I4. The charging current verification operation of the battery management system 10 is completed by continuously outputting different voltages to the battery management system 10 and acquiring the corresponding message information of the battery management system 10 through the information acquisition unit 31 to determine whether the charging function of the battery management system is normal. Specifically, the charge verification operation may be, for example, controlling the output voltage of the high-voltage output unit 22 such that the cell voltage collected by the battery management system 10 is less than or equal to U1 for a time t1, and setting a current judgment timeout time t2(t2< t 1). If the charging current I ≠ I1 is detected within the range of t2, it indicates that the charging current verification at this stage fails. And controlling the output voltage of the high-voltage output unit 22 to enable the voltage of the single battery collected by the battery management system 10 to be larger than U1 and smaller than or equal to U2, keeping the time t3, and setting a current judgment timeout time t4(t4< t 3). If the charging current I ≠ I2 is detected within the range of t4, it indicates that the charging current verification at this stage fails. And controlling the output voltage of the high-voltage output unit 22 to enable the voltage of the single battery collected by the battery management system 10 to be greater than U2 and less than or equal to U3, and the duration t 5. A current judgment timeout time t6 is set (t6< t 5). If the charging current I is not equal to I3, which is collected by the battery management system 10, within the range of t6, indicating that the charging current verification at this stage fails; and controlling the output voltage of the high-voltage output unit 22 to enable the voltage of the single battery collected by the battery management system 10 to be larger than U3, lasting for a time t7, and setting a current judgment timeout time t8(t8< t 7). If the charging current I is not equal to I4 within the range of t8, the charging current verification at this stage is failed.

In testing the charge simulation operation of the battery management system 10, the SOC of the battery management system 10 may be set₀The value is 0, the target SOC value is 100%, the scheduled charging time is n seconds, the charging current is set by the controllable power supply 23, and the charging current can be set according to actual requirements. The cell box high voltage output unit 22 calculated according to the formula (1) sends a required output voltage. The output voltage value is V12 m, V is the voltage of the single battery calculated by the formula 1, and m is an adjustment coefficient. After the voltage is output, the battery management system 10 is calculated according to equation (3)And calculating to obtain the SOC.

Wherein, I_iThe current collected for the ith time, n is the number of the collected currents, C is the total capacity of the battery, and SOC is a value calculated by a battery management system. And comparing the standard SOC curve calculated in advance with the SOC curve calculated by the battery management system, thereby finishing the charging simulation operation. Similarly, the specific process of performing the discharge simulation operation on the battery management system 10 can also be performed according to the above-mentioned principle.

Further, the in-loop test system can also fit the SOC curve calculated by the battery management system and a preset (or instantaneous simulation calculated) simulation SOC curve in the same graph, so as to test functions such as whether the discharging relay of the battery management system 10 is closed in the discharging process, whether the discharging relay is opened when the charging meets the charging disconnection requirement, whether the descending curve of the SOC meets the requirement in the discharging process, whether the discharged battery voltage over-discharge fault and the discharging current fault can be timely alarmed, and the like.

The above describes in detail optional embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details of the above embodiments, and the technical concept of the embodiments of the present invention can be within the scope of the present invention, and can be modified in a variety of ways, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.

Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In addition, various different embodiments of the present invention can be combined arbitrarily, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.

Claims

1. An in-loop test system for hardware of a battery management system, the in-loop test system comprising:

2. The on-loop test system of claim 1, wherein the hardware-on-loop detection module further comprises:

3. The on-loop test system of claim 2, wherein the hardware-on-loop detection module further comprises:

4. The on-ring test system of claim 3, wherein the hardware-on-ring test module further comprises:

5. The on-ring test system of claim 4, wherein the hardware-on-ring test module further comprises:

6. The in-loop test system of claim 2, wherein the information acquisition unit is connected to the battery management system via a CAN communication line.

7. The on-loop test system of claim 4, wherein the high voltage control unit is connected to the high voltage output unit through an RS485 device.