Battery pack simulation system and method

Abstract

The application discloses a kind of battery pack simulation system and method.The system includes: two-way programmable DC power module, control unit and acquisition module;Wherein, control unit includes control module and simulation module.The application simulates the input characteristics, output characteristics, electric energy conversion characteristics and temperature control characteristics of battery pack under various working modes by the battery pack simulation system based on two-way programmable DC power supply, battery mathematical model and thermal simulation mathematical model, quickly and accurately simulates various characteristics of battery pack before real battery pack design and production, reduces production cost, improves production efficiency, and provides maximum system integration function for operator.

Description

Technical Field

[0001] This invention belongs to the field of battery pack simulation technology, and more specifically, relates to a battery pack simulation system and method. Background Technology

[0002] In new energy power systems, battery banks, as components that provide and store electrical energy, are an indispensable and crucial part of the system. Especially in the fields of aviation and aerospace technology, avionics systems require battery banks as their power source during commissioning and performance evaluation, involving tests such as energy storage, loading, unloading, energy matching, and grid ripple detection. Because new aviation and aerospace propulsion systems are often customized energy storage products, battery bank development cycles are long, production costs are high, cycle life is short, and battery bank voltage regulation is difficult. Furthermore, frequent charging and discharging of battery banks during system commissioning can affect the safety of the battery and the test system, reducing the battery bank's lifespan. Therefore, it is necessary to quickly and accurately simulate the dynamic characteristics of the battery bank's State of Charge (SOC) before the actual design and production of the battery bank, avoiding the need for mass production.

[0003] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to propose a battery pack simulation system and method, which realizes the transformation of electrical energy through the battery pack simulation system to obtain an electrical energy curve similar to the volt-ampere characteristics of a real battery pack, simplifying operation, shortening the test cycle, reducing the safety risks of power system-related tests, and providing operators with maximum system integration capabilities.

[0005] According to a first aspect of the present invention, a battery pack simulation system is provided, comprising:

[0006] A bidirectional programmable DC power supply module for simulating the charging and discharging functions of a battery pack;

[0007] The control unit includes a control module and a simulation module;

[0008] The simulation module has a built-in simulation model, and the control module controls the bidirectional programmable DC power supply module to generate and dissipate electrical energy according to the simulation model.

[0009] The acquisition module is used to acquire the current signal of the bidirectional programmable DC power supply module to obtain the cumulative amount or dissipation of electrical energy, and feed it back to the simulation module.

[0010] Optionally, the simulation model is a standard battery mathematical model and a standard battery thermal simulation mathematical model;

[0011] The standard battery mathematical model is used to generate the SOC curve of the simulated battery pack, thereby obtaining the input characteristics, output characteristics and power conversion characteristics of the simulated battery pack.

[0012] The standard battery thermal simulation mathematical model is used to simulate the temperature rise changes of the simulated battery pack.

[0013] Optionally, it also includes:

[0014] The human-computer interaction module is used by the user to select the simulation model and configure the parameters of the simulated battery pack.

[0015] Optionally, it also includes:

[0016] The monitoring unit includes a monitoring module, a storage module, and a display interface;

[0017] The monitoring module is used to monitor the output characteristics and operating status of the battery pack simulation system in real time and feed them back to the control unit;

[0018] The storage module is used to store the monitoring data of the monitoring module;

[0019] The display interface is used to display the monitoring data of the monitoring module.

[0020] Optionally, it also includes:

[0021] The protection unit includes a soft-start module and a thermal protection module;

[0022] The soft-start module is used to soft-start the system and suppress the instantaneous overshoot and surge phenomena of the system output;

[0023] The heat dissipation protection module is used to dissipate heat from the system.

[0024] Optionally, it also includes:

[0025] A power module is used to provide power to the battery pack simulation system.

[0026] According to a second aspect of the present invention, a battery pack simulation method is proposed, comprising:

[0027] The simulation model is selected through the human-computer interaction module, and the parameters of the simulated battery pack are configured in the simulation model.

[0028] The control module controls the bidirectional programmable DC power supply module to generate and dissipate electrical energy according to the simulation model, simulating the charging and discharging function of the battery pack.

[0029] The current signal of the bidirectional programmable DC power supply module is collected by the acquisition module to obtain the accumulated amount or dissipation of electrical energy, and then fed back to the simulation module.

[0030] The simulation module adjusts the port voltage and current of the bidirectional DC power supply module according to the accumulated or dissipated electrical energy through the control module, thereby obtaining the input characteristics, output characteristics, and electrical energy conversion characteristics of the simulated battery pack.

[0031] The simulation module continuously iterates and modifies the battery parameters to simulate temperature rise changes and obtain the temperature control characteristics of the simulated battery pack.

[0032] Optionally, the simulation model includes a standard battery mathematical model and a standard battery thermal simulation mathematical model;

[0033] The standard battery mathematical model is used to generate the simulated SOC curve of the simulated battery pack, thereby obtaining the input characteristics, output characteristics and power conversion characteristics of the simulated battery pack.

[0034] The battery thermal simulation model is used to obtain the temperature control characteristics of the simulated battery pack.

[0035] Optionally, it also includes:

[0036] The measured SOC curve data of a single cell is imported into the standard battery mathematical model, and a single cell rate combination model is generated by fitting. The SOC curve and multi-cycle capacity degradation curve of the simulated battery pack composed of the single cells are then generated.

[0037] Optionally, the acquisition module can perform millisecond-level time-dimensional integration on the acquired current signal to obtain the accumulated amount or dissipation of electrical energy.

[0038] The beneficial effects of this invention are as follows: This invention uses a battery pack simulation system based on a bidirectional programmable DC power supply, a battery mathematical model, and a thermal simulation mathematical model to simulate the input characteristics, output characteristics, energy conversion characteristics, and temperature control characteristics of a battery pack under various operating modes during energy transfer. Before the design and production of a real battery pack, it can quickly and accurately simulate the SOC dynamic characteristics of the battery pack, eliminating the need for mass production of battery packs. By converting electrical energy through the battery pack simulation system, an energy curve similar to the volt-ampere characteristics of a real battery pack can be obtained, reducing production costs, improving production efficiency, and providing operators with maximized system integration capabilities.

[0039] The system of the present invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0040] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0041] Figure 1 A schematic diagram of a battery pack simulation system according to the present invention is shown.

[0042] Figure 2 A schematic diagram of a battery pack simulation system according to Embodiment 1 of the present invention is shown.

[0043] Figure 3 A schematic diagram of the structure of the detection unit of a battery pack simulation system according to Embodiment 1 of the present invention is shown.

[0044] 1. Bidirectional programmable DC power supply module; 2. Control unit; 3. Control module; 4. Simulation module; 5. Data acquisition module; 6. Protection unit; 7. Soft start module; 8. Heat dissipation protection module; 9. Monitoring unit; 10. Human-machine interaction module; 11. Monitoring module; 12. Storage module; 13. Display interface. Detailed Implementation

[0045] The invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0046] like Figure 1 As shown, a battery pack simulation system according to the present invention includes:

[0047] A bidirectional programmable DC power supply module for simulating the charging and discharging functions of a battery pack;

[0048] The control unit includes a control module and a simulation module;

[0049] The simulation module has a built-in simulation model, and the control module controls the bidirectional DC power supply to generate and dissipate electrical energy according to the simulation model.

[0050] The acquisition module is used to acquire the current signal of the bidirectional programmable DC power supply module to obtain the cumulative amount or dissipation of electrical energy, and then feed it back to the simulation module.

[0051] Specifically, in this invention, the battery pack simulation system includes: a bidirectional programmable DC power supply module, a control unit, and a data acquisition module; wherein the control unit includes a control module and a simulation module;

[0052] The simulation module uses a built-in simulation model to simulate a battery pack. Parameters of the simulated battery pack are input into the simulation model. The control module controls the bidirectional programmable DC power supply module to generate and dissipate electrical energy, simulating the charging and discharging function of the battery pack. The acquisition module collects the current signal from the bidirectional programmable DC power supply module to obtain the accumulated or dissipated electrical energy, and feeds it back to the simulation module. Through PID correction of the second-order system in the simulation module, the data results are calculated in real time and iterated continuously to correct the parameters of the battery pack simulation system (voltage, current, remaining capacity, simulation temperature, etc.), achieving closed-loop simulation of the battery pack simulation system.

[0053] In one example, the simulation models are a standard battery mathematical model and a standard battery thermal simulation mathematical model;

[0054] A standard battery mathematical model is used to generate the SOC curve of a simulated battery pack;

[0055] The standard mathematical model for thermal simulation of batteries is used to simulate the temperature rise changes of battery packs.

[0056] Specifically, by inputting the series / parallel relationship and cycle number of the simulated battery pack into the standard battery mathematical model of the simulation module, the SOC curve of the simulated battery pack is generated;

[0057] Alternatively, by inputting the series / parallel relationship, cycle number, and individual cell parameters of the simulated battery pack into the standard battery mathematical model of the simulation module, the SOC curve of the simulated battery pack can be generated.

[0058] By inputting a constant ambient temperature and air pressure into the standard battery thermal simulation mathematical model, and in conjunction with the standard battery mathematical model, the temperature change of the simulated battery pack is simulated in real time according to the change in the power of the simulated battery pack.

[0059] Alternatively, by inputting dynamic ambient temperature and air pressure into a standard battery thermal simulation mathematical model, and working in conjunction with the standard battery mathematical model, the temperature changes of the simulated battery pack can be simulated in real time based on changes in temperature, air pressure, and the power of the simulated battery pack.

[0060] For example, by importing the measured SOC curve data of a single cell into the standard battery mathematical model, namely the single-rate multi-cycle data, multi-rate single-cycle data, and multi-rate multi-cycle data of a single cell, and by setting the initial SOC and the initial number of charge-discharge cycles of the battery pack, the simulated SOC curve of the battery pack composed of the single cells and its multi-cycle capacity decay state are fitted and generated.

[0061] By inputting the temperature and pressure of the standard atmospheric environment into the standard battery thermal simulation mathematical model and calling the standard battery thermal simulation mathematical model, thermal simulation is performed. The theoretical design value of a single battery cell under the standard atmospheric environment is configured or the measured temperature data of a single battery cell at different charge and discharge rates are imported. During the charging and discharging process of the simulated battery pack, the system continuously iterates and modifies the parameters of the battery pack, thereby completing the simulation of temperature rise changes and obtaining the temperature rise changes of the simulated battery pack under the standard atmospheric environment.

[0062] In one example, the battery pack simulation system in this invention further includes:

[0063] The human-computer interaction module is used by users to select simulation models and configure parameters of the simulated battery pack.

[0064] Specifically, users can select the standard battery mathematical model and the standard battery thermal simulation mathematical model through the human-computer interaction module, and configure parameters such as the series / parallel relationship of the simulated battery pack, the number of cycles, ambient temperature and air pressure in the model.

[0065] For example, the human-computer interaction module can be a keyboard, mouse, or touch screen device;

[0066] Users select a standard battery mathematical model through the human-computer interaction module and configure the series / parallel relationship and cycle number of the simulated battery pack in the model;

[0067] Alternatively, users can select a standard battery mathematical model through the human-computer interaction module, configure the series / parallel connection and cycle number of the simulated battery pack in the model, and input the parameters of individual cells, such as voltage, current, capacity, internal resistance, etc., to replace the individual cell parameters in the standard battery mathematical model.

[0068] In one example, the battery pack simulation system in this invention further includes:

[0069] The monitoring unit includes a monitoring module, a storage module, and a display interface;

[0070] The monitoring module is used to monitor the output characteristics and operating status of the battery pack simulation system in real time and feed the feedback to the control unit;

[0071] The storage module is used to store the monitoring data from the monitoring module;

[0072] The display interface is used to show the monitoring data from the monitoring module.

[0073] Specifically, the monitoring module can monitor the system's output characteristics and operating status in real time and feed it back to the system's control unit. The monitoring module performs secondary status monitoring of energy nodes through internal sensors and signal conditioning devices, and can collect voltage and current values ​​of the power distribution channel in real time and feed them back to the system's control unit for remote adjustment data verification. The monitoring module can display the system's remote adjustment data and monitoring data in real time on the display interface and store them in the storage module. By viewing the stored voltage and current waveforms, the system's operating status can be analyzed, and real-time warnings can be given for possible faults in the system. The display interface can also display a human-machine interface.

[0074] In one example, the battery pack simulation system in this invention further includes:

[0075] The protection unit includes a soft-start module and a thermal protection module;

[0076] The soft-start module is used to soft-start the system and suppress instantaneous overshoot and surge phenomena in the system output;

[0077] The heat dissipation protection module is used to dissipate heat from the system.

[0078] Specifically, the soft-start module is designed to prevent voltage overshoot from occurring at the moment of output of the bidirectional programmable DC power supply module, thus protecting the external power devices of the battery pack simulation system. It employs a soft-start protection method internally to suppress overshoot and surge phenomena at the moment of output of the battery simulation system. The heat dissipation protection module is designed to prevent excessively high temperatures within the system due to long-term high-power operation of the battery simulation system, thus providing heat dissipation. Furthermore, considering the inductive load characteristics of the connected external devices, a back-EMF dissipator can be used to provide safety protection for the system and other external devices.

[0079] For example, the thermal protection module can use air cooling to dissipate heat from the system.

[0080] In one example, the battery pack simulation system in this invention further includes:

[0081] The power module is used to provide power to the battery pack simulation system.

[0082] Specifically, the power supply module is used to provide power to modules within the system, such as the bidirectional programmable DC power supply module, control module, simulation module, and acquisition module.

[0083] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0084] Example 1

[0085] like Figure 2 As shown, this embodiment provides a battery pack simulation system, including:

[0086] A bidirectional programmable DC power supply module 1 is used to simulate the charging and discharging functions of a battery pack;

[0087] Control unit 2 includes control module 3 and simulation module 4;

[0088] The simulation module 4 has a built-in simulation model, and the control module 3 controls the bidirectional programmable DC power supply module 1 to generate and dissipate electrical energy according to the simulation model.

[0089] The acquisition module 5 is used to acquire the current signal of the bidirectional programmable DC power supply module 1 to obtain the accumulated amount or dissipation of electrical energy, and feed it back to the simulation module 4.

[0090] Protection unit 6 includes a soft-start module 7 and a heat dissipation protection module 8;

[0091] The soft-start module 7 is used to soft-start the system and suppress instantaneous overshoot and surge phenomena in the system output;

[0092] The heat dissipation protection module 8 is used to dissipate heat from the system;

[0093] Monitoring unit 9 includes monitoring module 11, storage module 12, and display interface 13, such as... Figure 3 As shown;

[0094] The monitoring module 11 is used to monitor the output characteristics and operating status of the battery pack simulation system in real time and feed them back to the control unit;

[0095] Storage module 12 is used to store the monitoring data of the monitoring module;

[0096] Display interface 13 is used to display the monitoring data of the monitoring module.

[0097] The human-computer interaction module 10 is used by users to select simulation models and configure parameters of the simulated battery pack.

[0098] Example 2

[0099] This embodiment provides a battery pack simulation method, including:

[0100] The human-computer interaction module selects the standard battery mathematical model built into the simulation module, and configures the series / parallel relationship and cycle number of the simulated battery pack to generate the simulated SOC curve of the simulated battery pack.

[0101] Alternatively, you can configure additional parameters for individual cells in the standard battery mathematical model, such as voltage, current, capacity, and internal resistance, to replace the individual cell parameters in the standard battery mathematical model and generate a simulated SOC curve for the simulated battery pack.

[0102] Alternatively, the measured SOC curve data of a single cell can be imported into the standard battery mathematical model, namely the single-rate multi-cycle data, multi-rate single-cycle data, and multi-rate multi-cycle data of a single cell, and the simulated SOC curve of the battery pack composed of the single cells and its multi-cycle capacity decay state curve can be generated by fitting.

[0103] The control module controls the bidirectional programmable DC power supply module to generate and dissipate electrical energy according to the configured standard battery mathematical model, simulating the charging and discharging function of the battery pack.

[0104] The current signal of the bidirectional programmable DC power supply module is acquired by the acquisition module to obtain the accumulated or dissipated electrical energy, and then fed back to the simulation module.

[0105] The simulation module adjusts the port voltage and current of the bidirectional DC power supply module according to the accumulated or dissipated electrical energy through the control module to simulate the input characteristics, output characteristics and electrical energy conversion characteristics of the battery pack under various working modes in the energy transfer system.

[0106] The user selects the standard battery thermal simulation mathematical model built into the simulation module through the human-computer interaction module, and configures constant temperature and pressure or dynamic temperature and pressure. Then, the user configures the theoretical design value of a single battery under standard atmospheric conditions or imports the measured temperature data of a single battery at different charge and discharge rates. The standard battery mathematical model is called, and during the battery pack charge and discharge simulation process, the simulation module continuously iterates and modifies the battery parameters to complete the simulation of temperature rise changes and obtain the temperature control characteristics of the simulated battery pack.

[0107] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A battery pack simulation system, characterized in that, include: A bidirectional programmable DC power supply module for simulating the charging and discharging functions of a battery pack; The control unit includes a control module and a simulation module; The simulation module has a built-in simulation model, and the control module controls the bidirectional programmable DC power supply module to generate and dissipate electrical energy according to the simulation model. The acquisition module is used to acquire the current signal of the bidirectional programmable DC power supply module to obtain the accumulated amount or dissipation of electrical energy, and feed it back to the simulation module. By using PID correction of the second-order system, real-time calculation of data results and continuous iteration, the parameters of the battery pack simulation system are corrected, thereby realizing closed-loop simulation of the battery pack simulation system. The simulation model is a standard battery mathematical model and a standard battery thermal simulation mathematical model; The standard battery mathematical model is used to generate the SOC curve of the simulated battery pack, thereby obtaining the input characteristics, output characteristics and power conversion characteristics of the simulated battery pack. The standard battery thermal simulation mathematical model is used to simulate the temperature rise of the simulated battery pack, thereby obtaining the temperature control characteristics of the simulated battery pack. The simulation module performs PID correction based on the accumulated or dissipated electrical energy fed back by the acquisition module, and then iteratively corrects the system parameters to achieve closed-loop simulation of the battery pack simulation system.

2. The battery pack simulation system according to claim 1, characterized in that, Also includes: The human-computer interaction module is used by the user to select the simulation model and configure the parameters of the simulated battery pack.

3. The battery pack simulation system according to claim 1, characterized in that, Also includes: The monitoring unit includes a monitoring module, a storage module, and a display interface; The monitoring module is used to monitor the output characteristics and operating status of the battery pack simulation system in real time and feed them back to the control unit; The storage module is used to store the monitoring data of the monitoring module; The display interface is used to display the monitoring data of the monitoring module.

4. The battery pack simulation system according to claim 1, characterized in that, Also includes: The protection unit includes a soft-start module and a thermal protection module; The soft-start module is used to soft-start the system and suppress the instantaneous overshoot and surge phenomena of the system output; The heat dissipation protection module is used to dissipate heat from the system.

5. A battery pack simulation system according to claim 1, characterized in that, Also includes: A power module is used to provide power to the battery pack simulation system.

6. A battery pack simulation method, employing the battery pack simulation system as described in any one of claims 1-5, characterized in that, include: The simulation model is selected through the human-computer interaction module, and the parameters of the simulated battery pack are configured in the simulation model. The control module controls the bidirectional programmable DC power supply module to generate and dissipate electrical energy according to the completed simulation model, simulating the charging and discharging function of the battery pack. The current signal of the bidirectional programmable DC power supply module is collected by the acquisition module to obtain the accumulated amount or dissipation of electrical energy, and then fed back to the simulation module. The simulation module adjusts the port voltage and current of the bidirectional programmable DC power supply module according to the accumulated or dissipated electrical energy through the control module, thereby obtaining the input characteristics, output characteristics, and electrical energy conversion characteristics of the simulated battery pack. The simulation module continuously iterates and modifies the battery parameters to simulate temperature rise changes and obtain the temperature control characteristics of the simulated battery pack. The simulation model includes a standard battery mathematical model and a standard battery thermal simulation mathematical model; The standard battery mathematical model is used to generate the simulated SOC curve of the simulated battery pack, thereby obtaining the input characteristics, output characteristics and power conversion characteristics of the simulated battery pack. The standard battery thermal simulation mathematical model is used to obtain the temperature rise change of the simulated battery pack and the temperature control characteristics of the simulated battery pack. The simulation module performs PID correction based on the accumulated or dissipated electrical energy fed back by the acquisition module, and then iteratively corrects the system parameters to achieve closed-loop simulation of the battery pack simulation system.

7. The battery pack simulation method according to claim 6, characterized in that, Also includes: The measured SOC curve data of a single cell is imported into the standard battery mathematical model, and a single cell rate combination model is generated by fitting. The SOC curve and multi-cycle capacity degradation curve of the simulated battery pack composed of the single cells are then generated.

8. A battery pack simulation method according to claim 6, characterized in that, The acquisition module performs millisecond-level time-dimensional integration on the acquired current signal to obtain the accumulated or dissipated electrical energy.

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