Power battery hardware-in-the-loop test system

Abstract

The invention discloses a power battery hardware-in-the-loop test system, which is characterized in that a hardware-in-the-loop rack, an upper computer, a battery cell charging and discharging device, a real battery cell monomer and a battery management system are used for building a hardware architecture of the test system, and the battery cell charging and discharging device is used for exciting the battery cell monomer and collecting battery parameters in real time; building a battery model in the hardware-in-the-loop rack by using the battery parameters; comparing each battery parameter data calculated by the battery model in a simulation manner with real battery data; and evaluating the accuracy of the battery model according to the comparison result, and reconstructing a mapping relation according to the real battery data to correct the parameters of the battery model, so as to iterate until the battery model meets the set accuracy requirement. According to the method, the accuracy of predicting the battery performance by the battery controller can be ensured, the modeling work of the full-life-cycle full-working-condition battery model can be quickly completed, and a remarkable gain effect is achieved on the development of battery control strategies of different types of pure electric vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle testing, and in particular to a power battery hardware-in-the-loop testing system. Background Art

[0002] With the promotion and popularization of pure electric vehicle products, especially the gradual increase in private users, the driving experience of pure electric vehicles has attracted more and more attention from users. When the vehicle mileage increases, the battery degradation will inevitably increase, and the relationship between battery charging and discharging capacity, internal resistance and temperature will change greatly. These changes will bring great challenges to the battery controller to predict battery performance.

[0003] To elaborate, the battery modeling data involved in the electrical controller comes from the calibration of the capacity decay of the power battery in the test bench before it leaves the factory. However, the test bench working conditions cannot simulate the actual usage conditions of each user, so its calibration results cannot cover the actual battery performance decay of each battery pack in its entire life cycle. Therefore, more battery data is needed to optimize the model in the battery controller, and it is also necessary to quickly verify the model after the optimization is completed.

[0004] Based on the above analysis, the present invention proposes that at least the following issues need to be focused on: 1) rapid iterative verification of the constructed battery model; 2) rapid verification of the battery controller's comprehensive operating condition control strategy for the battery (battery cell) throughout its life cycle. Summary of the invention

[0005] In view of the above, the present invention aims to provide a power battery hardware-in-the-loop testing system to solve the above-mentioned technical problems.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention provides a power battery hardware-in-the-loop test system, which includes: a hardware-in-the-loop test bench for building a battery model and performing simulation tests, a host computer, a battery cell charging and discharging device, a real battery cell monomer, and a battery management system;

[0008] The host computer is connected to the hardware-in-the-loop test bench and the battery cell charging and discharging device respectively through control cables; the battery cell monomers are electrically connected to the battery cell charging and discharging device and the battery management system respectively; and the hardware-in-the-loop test bench is electrically connected to the battery management system;

[0009] The testing process of the test system includes:

[0010] The battery cell charging and discharging device excites the battery cell and collects battery parameters in real time;

[0011] A battery model is built in the hardware-in-the-loop test bench using the battery parameters; wherein the battery cell charging and discharging equipment and the battery model both perform actual charging and discharging operations and charging and discharging simulations according to a preset charging and discharging curve;

[0012] Compare the battery parameter data calculated by the battery model with the real battery data collected by the battery cell charging and discharging device; and make the parameters of the battery model consistent with the parameters in the battery management system;

[0013] Evaluate the accuracy of the battery model according to the comparison result, and reconstruct the mapping relationship according to the real battery data collected in real time to correct the battery parameter data of the battery model;

[0014] The above test process is iterated until the battery model meets the established accuracy requirements.

[0015] In at least one possible implementation manner, the battery cell monomers use battery cells with different attenuation degrees.

[0016] In at least one possible implementation manner, the preset charge and discharge curve is a charge and discharge curve under normal battery use conditions.

[0017] In at least one possible implementation, the hardware-in-the-loop test bench specifically includes: a simulation platform, and a current board, a temperature board, and a battery cell board that interact with the simulation platform.

[0018] In at least one possible implementation manner, the battery management system specifically includes: a current acquisition channel, a temperature acquisition channel, and a single cell voltage acquisition channel.

[0019] In at least one possible implementation manner, a temperature sensing device is provided on the battery cell.

[0020] In at least one possible implementation, the battery cell monomer is connected to the current collection channel and the monomer voltage collection channel, respectively, and the battery cell board is connected to the monomer voltage collection channel; the temperature sensing device and the temperature board are connected to the temperature collection channel, respectively; the battery cell monomer and the current board are connected to the current collection channel, respectively.

[0021] Compared with the prior art, the main design concept of the present invention is to build the hardware architecture of the test system by hardware-in-the-loop test bench, host computer, battery cell charging and discharging equipment, real battery cell monomers and battery management system, the battery cell charging and discharging equipment stimulates the battery cell monomers and collects battery parameters in real time; uses battery parameters to build a battery model in the hardware-in-the-loop test bench; compares the battery parameter data calculated by the battery model simulation with the real battery data; evaluates the accuracy of the battery model according to the comparison results, and reconstructs the mapping relationship with the real battery data to correct the battery model parameters, so as to iterate until the battery model meets the established accuracy requirements. The present invention can ensure the accuracy of the battery controller in predicting battery performance, and quickly complete the modeling of the battery model under all working conditions of the whole life cycle, such as quickly completing the optimization of battery parameters and quickly verifying the optimized model. It is suitable for the battery model data collection of different types of pure electric vehicles, and quickly verifies and iterates them, which has a significant gain effect on the strategy development of the battery controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0023] Figure 1 A schematic diagram of a power battery hardware-in-the-loop test system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0025] The present invention proposes an embodiment of a power battery hardware-in-the-loop test system. Specifically, Figure 1 As shown, it includes: a hardware-in-the-loop test bench for building a battery model and conducting simulation tests, a host computer, battery cell charging and discharging equipment, real battery cells, and a battery management system (BMS);

[0026] Hardware-in-the-loop (HIL) is a semi-physical simulation test technology that can provide a simulation operating environment for the battery management system. A battery model is built in the simulation test platform and its parameters can be adjusted in real time to quickly perform simulation tests.

[0027] Continuing from the above, the battery cell monomer is used to replace a battery cell board for simulation in the hardware-in-the-loop test bench; and the parameters of the battery model constructed in the hardware-in-the-loop test bench are consistent with the parameters in the battery management system.

[0028] The host computer is connected to the hardware-in-the-loop test bench and the battery charging and discharging device through control cables, the battery cells are electrically connected to the battery charging and discharging device and the battery management system, and the hardware-in-the-loop test bench is electrically connected to the battery management system.

[0029] The testing process of the system includes:

[0030] The battery cell charging and discharging device excites the battery cell and collects battery parameters in real time;

[0031] The battery parameters are used to build a battery model in a hardware-in-the-loop test bench; wherein the battery cell charging and discharging equipment and the battery model both perform actual charging and discharging operations and charging and discharging simulations according to a preset charging and discharging curve (under normal battery operating conditions);

[0032] Comparing the battery parameter data calculated by the battery model with the real battery data collected by the battery cell charging and discharging equipment;

[0033] Evaluate the accuracy of the battery model according to the comparison results, and reconstruct the mapping relationship according to the real battery data collected in real time, so as to correct the battery parameter data of the battery model;

[0034] The above process is iterated until the battery model meets the established accuracy requirements.

[0035] It can also be added that since this system uses virtual cells (battery models) + real cells (cell monomers) as the controlled objects of the BMS, it is more preferred to replace the normal cell monomers in the system with cells with different degrees of attenuation, etc., to simulate the real full life cycle management strategy, for example, to simulate whether the entire battery pack parameter estimation can be guaranteed to be correct and not cause cell failure when the BMS encounters performance aging, and continuously collect the cell status under this working condition, balance battery safety and battery performance release, and improve battery life. Therefore, it can effectively assist R&D personnel in real-time evaluation of whether there are deviations in the control model, complete rapid iterative development, and improve the quality of battery control algorithms.

[0036] In addition, the hardware architecture of the system can be expanded as follows: the hardware-in-the-loop test bench specifically includes: a simulation platform, and a current board, a temperature board, and a battery cell board that interact with the simulation platform; the battery management system can mainly include: a current acquisition channel, a temperature acquisition channel, and a single cell voltage acquisition channel; further, a temperature sensing device is provided at the battery cell.

[0037] Based on the above-mentioned hardware specific implementation plans, the electrical connection relationship can be further refined as follows: the battery cell monomers are respectively connected to the current collection channel and the monomer voltage collection channel, and the battery cell board is connected to the monomer voltage collection channel; the temperature sensing device and the temperature board are respectively connected to the temperature collection channel; the battery cell monomers and the current board are respectively connected to the current collection channel.

[0038] In summary, the main design concept of the present invention is to build a hardware architecture of the test system by hardware-in-the-loop test bench, host computer, battery cell charging and discharging equipment, real battery cell monomers and battery management system, the battery cell charging and discharging equipment stimulates the battery cell monomers and collects battery parameters in real time; uses battery parameters to build a battery model in the hardware-in-the-loop test bench; compares the battery parameter data calculated by the battery model simulation with the real battery data; evaluates the accuracy of the battery model according to the comparison results, and reconstructs the mapping relationship with the real battery data to correct the battery model parameters, so as to iterate until the battery model meets the established accuracy requirements. The present invention can ensure the accuracy of the battery controller in predicting battery performance, and quickly complete the modeling of battery models under all working conditions throughout the life cycle, such as quickly completing the optimization of battery parameters and quickly verifying the optimized model. It is suitable for battery model data collection of different types of pure electric vehicles, and quickly verifies and iterates them, which has a significant gain effect on the development of battery controller strategies.

[0039] If the expressions expressing orientation are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0040] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A power battery hardware-in-the-loop test system, characterized in that: include: Hardware-in-the-loop test bench, host computer, battery cell charging and discharging equipment, real battery cells and battery management system for building battery models and conducting simulation tests; The host computer is connected to the hardware-in-the-loop test bench and the battery cell charging and discharging device respectively through control cables; the battery cell monomers are electrically connected to the battery cell charging and discharging device and the battery management system respectively; and the hardware-in-the-loop test bench is electrically connected to the battery management system; The testing process of the testing system includes: The battery cell charging and discharging device excites the battery cell monomer and collects battery parameters in real time; A battery model is built in the hardware-in-the-loop test bench using the battery parameters; wherein the battery cell charging and discharging equipment and the battery model both perform actual charging and discharging operations and charging and discharging simulations according to a preset charging and discharging curve; Compare the battery parameter data calculated by the battery model with the real battery data collected by the battery cell charging and discharging device; and make the parameters of the battery model consistent with the parameters in the battery management system; Evaluate the accuracy of the battery model according to the comparison result, and reconstruct the mapping relationship according to the real battery data collected in real time to correct the battery parameter data of the battery model; The above test process is iterated until the battery model meets the established accuracy requirements.

2. The power battery hardware-in-the-loop test system according to claim 1, characterized in that: The battery cell monomers use battery cells with different attenuation degrees.

3. The power battery hardware-in-the-loop test system according to claim 1, characterized in that: The preset charge and discharge curve is the charge and discharge curve under normal battery use conditions.

4. The power battery hardware-in-the-loop test system according to any one of claims 1 to 3, characterized in that: The hardware-in-the-loop test bench specifically includes: a simulation platform, and a current board, a temperature board, and a battery cell board that interact with the simulation platform.

5. The power battery hardware-in-the-loop test system according to claim 4, characterized in that: The battery management system specifically includes: a current acquisition channel, a temperature acquisition channel, and a single cell voltage acquisition channel.

6. The power battery hardware-in-the-loop test system according to claim 5, characterized in that: A temperature sensing device is arranged on the battery cell monomer.

7. The power battery hardware-in-the-loop test system according to claim 6, characterized in that: The battery cell monomers are respectively connected to the current collection channel and the monomer voltage collection channel, and the battery cell board is connected to the monomer voltage collection channel; the temperature sensing device and the temperature board are respectively connected to the temperature collection channel; the battery cell monomers and the current board are respectively connected to the current collection channel.

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