Power battery module simulator capable of rapidly adjusting voltage

Abstract

The invention discloses a power battery module simulator capable of quickly adjusting voltage, which comprises an upper computer used for inputting voltage of each battery cell in a battery module; the programmable controller is used for calculating the output total voltage and the control quantity of each battery cell, issuing a control instruction, controlling the total output voltage of the programmable power supply and controlling the output voltage of the analog quantity output module; the programmable power supply is used for receiving the total output voltage from the programmable controller and controlling the total voltage provided for the battery module according to the control instruction; the analog quantity output module is used for receiving the cell control quantity from the programmable controller and controlling and outputting a common-ground voltage value according to a control instruction; and the signal isolator is used for converting the common-ground voltage value into a floating-ground voltage value and controlling the voltage of each battery cell. According to the invention, the circuit complexity of the simulator can be reduced, multi-channel expansion is easy, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical fields of new energy vehicles and energy storage systems, and particularly to a power battery module simulator capable of quickly adjusting voltage. Background Art

[0002] Existing multi-cell simulators adjust the output voltage by controlling the on and off times of the switching elements in the DC-DC converter. By connecting multiple DC-DC converters in series, the total output voltage characteristics of multiple series-connected cells can be simulated. At the same time, by independently controlling each simulated cell, the proportion of its output voltage can be changed to simulate the voltage division of series-connected cells under different states of charge, as Figure 2 shown. Using the PID control algorithm, according to the error between the set total output voltage and the target voltage and actual output voltage of each cell, the control signal is automatically adjusted to quickly and accurately adjust the output voltage of each simulated cell, so that the output characteristics of the series simulator highly match the output characteristics of real multiple series-connected cells under different working conditions. It is mainly used to simulate the discharge process.

[0003] Current technical problems:

[0004] Difficulty in component parameter matching: Each simulated cell channel needs to be independently configured with hardware such as a DC-DC converter and a sensor. The discreteness of component parameters (such as resistance, capacitance, and switching tube characteristics) will cause a deviation between the actual output of each channel and the set value, affecting the simulation accuracy of the series total voltage / current.

[0005] Problem of multi-variable coupling control: When multiple cells are connected in series, parameters such as voltage, current, and internal resistance of each channel are interrelated (such as the total current is affected by the internal resistance of each cell). The control algorithm needs to handle the problem of multi-variable coupling, which may lead to complex parameter debugging and a decrease in system stability.

[0006] High hardware cost: Each simulated cell requires independent power devices (such as MOSFETs, inductors), drive circuits, sampling modules, etc. As the number of series-connected cells increases, the hardware cost increases linearly, and the volume and power consumption also increase significantly, limiting the application of the simulator in the testing of large-scale battery packs (such as more than a hundred strings).

[0007] Poor system scalability: Traditional simulators mostly adopt a fixed number of channels design (such as 8 channels, 16 channels). If it is necessary to expand the number of series-connected cells, it is necessary to re-design the hardware architecture or cascade multiple simulators.

[0008] Therefore, a power battery module simulator capable of quickly adjusting voltage is provided. Summary of the Invention

[0009] The object of the present invention is to provide a power battery module simulator that can quickly adjust the voltage, which can reduce the circuit complexity of the simulator, is easy to expand in multiple channels, and has a low cost.

[0010] The technical solution for achieving the above object is as follows:

[0011] A power battery module simulator capable of quickly adjusting the voltage, where the battery module is composed of n battery cells, each battery cell can independently control the voltage of the battery cell, and the voltages of the n battery cells are V1 - Vn respectively, including:

[0012] A host computer, which is used to input the voltages of the battery cells in the battery module;

[0013] A programmable controller, which calculates the total output voltage and the control amount of each battery cell, issues control instructions, controls the total output voltage of the programmable power supply, and controls the output voltage of the analog quantity output module;

[0014] The programmable power supply is used to receive the total output voltage from the programmable controller and control the total voltage provided to the battery module according to the control instruction;

[0015] The analog quantity output module is used to receive the control amount of the battery cell from the programmable controller and control the output common - ground voltage value according to the control instruction;

[0016] A signal isolator, which is used to convert the common - ground voltage value into a floating - ground voltage value and control the voltage of each battery cell;

[0017] Among them, one signal isolator corresponds to one battery cell, and the signal isolator is connected to the battery cell through a programmable resistance circuit;

[0018] The programmable controller, programmable power supply, analog quantity output module, signal isolator, programmable resistance circuit and battery module are integrally designed.

[0019] Preferably, in the programmable controller, the output voltage is finely adjusted through a fuzzy algorithm and a PID algorithm for closed - loop control.

[0020] Preferably, the host computer includes but is not limited to a touch screen, a computer configuration interface, and a text screen.

[0021] Preferably, the programmable controller controls the output voltage and current of the programmable power supply through RS485 communication, and the programmable controller outputs the control amount of each battery cell to the analog quantity output module through RS485 communication.

[0022] Preferably, the programmable resistance circuit is composed of a proportional amplification circuit, a variable resistance device, and a level - shift circuit.

[0023] Preferably, the ratio amplifier circuit drives and controls the variable group device to have different DC resistances. The variable group device is connected in series with the level shift circuit and is used to define the minimum voltage of each battery cell.

[0024] Preferably, the variable group device includes, but is not limited to, a bipolar transistor and a field effect transistor.

[0025] Preferably, the level shift circuit is one or more diodes connected in series.

[0026] The beneficial effects of the present invention are as follows: the total voltage and current output of the present invention are stable, the current consumed by the voltage simulation circuit of each battery cell is small, the number of battery cells can be configured as needed, the cost is low, the power consumption is small, the failure rate is low, and it is safe and reliable; functions such as overvoltage, undervoltage, and voltage difference alarm of the battery cells can be set with one key, the operation is simple, and the states and parameters of each battery cell during the charging process and discharging process of the battery pack can be accurately simulated at low cost, which can reduce the circuit complexity of the simulator and is easy to expand for multiple channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a module diagram of a power battery module simulator with a rapidly adjustable voltage according to the present invention;

[0028] Figure 2 is a schematic diagram of a power battery module for adjusting voltage in the prior art;

[0029] Figure 3 is a working flow chart of a power battery module simulator with a rapidly adjustable voltage according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Hereinafter, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] Hereinafter, the present invention will be further described in conjunction with the accompanying drawings.

[0032] As Figure 1As shown in the figure, a power battery module simulator capable of quickly adjusting voltage. The battery module is composed of n battery cells, and each battery cell can independently control the voltage of the battery cell. The voltages of the n battery cells are V1 - Vn respectively, including: a host computer 1, a programmable power supply 3, an analog output module 4, and a signal isolator 5.

[0033] The host computer 1 is used to input the voltages of the battery cells in the battery module.

[0034] In the embodiment, the host computer 1 includes but is not limited to a touch screen, a computer configuration interface, and a text screen.

[0035] The programmable controller 2 calculates the total output voltage and the control amount of each battery cell, issues control instructions, controls the total output voltage of the programmable power supply 3, and controls the output voltage of the analog output module 4.

[0036] In the embodiment, the output voltage is finely adjusted through a fuzzy algorithm and a PID algorithm in the programmable controller 2 for closed-loop control.

[0037] In the embodiment, the programmable controller 2 controls the output voltage and current of the programmable power supply 3 through RS485 communication, and the programmable controller 2 outputs the control amount of each battery cell to the analog output module 4 through RS485 communication.

[0038] The programmable power supply 3 is used to receive the total output voltage from the programmable controller 2 and control the total voltage provided to the battery module according to the control instruction.

[0039] The analog output module 4 is used to receive the control amount of the battery cell from the programmable controller 2 and control the output common-ground voltage value according to the control instruction.

[0040] The signal isolator 5 is used to convert the common-ground voltage value into a floating-ground voltage value to control the voltages of the battery cells. Since the voltages of the battery cells are connected in series with each other, the common-ground control amount cannot accurately control the voltages of the battery cells. Therefore, it is necessary to convert the common-ground voltage value into a floating-ground voltage value.

[0041] In the embodiment, one signal isolator 5 corresponds to one battery cell, and the signal isolator 5 is connected to the battery cell through a programmable resistance circuit;

[0042] The programmable controller 2, the programmable power supply 3, the analog output module 4, the signal isolator 5, the programmable resistance circuit, and the battery module are integrated.

[0043] Among them, the programmable resistance circuit is composed of a proportional amplification circuit 6, a variable resistance device 7, and a level shift circuit 8.

[0044] In the embodiment, the proportional amplification circuit 6 drives and controls the variable resistor device 7 (such as a crystal triode, a field effect transistor, etc.) to have different DC resistances. The variable resistor device 7 is connected in series with the level shift circuit 8 to limit the minimum voltage of each battery cell.

[0045] In the embodiment, the variable resistor device 7 includes but is not limited to a crystal triode and a field effect transistor.

[0046] In the embodiment, the level shift circuit 8 is one or more diodes connected in series.

[0047] In another embodiment, the level shift circuit 8 is one or more zener diodes connected in series.

[0048] Working principle:

[0049] As Figure 3 shown, the working process of a power battery module simulator capable of quickly adjusting the voltage is as follows:

[0050] Step S1, input the voltages of the battery cells in the battery module through the host computer 1 and send them to the programmable controller 2.

[0051] Step S2, the programmable controller 2 calculates the total output voltage and the control quantity of each battery cell, issues control instructions, controls the total output voltage of the programmable power supply 3, and controls the output voltage of the analog output module 4.

[0052] Step S3, the programmable power supply 3 controls the total voltage provided to the battery module according to the control instruction, and the analog output module 4 controls the output common ground voltage value according to the control instruction.

[0053] Step S4, the signal isolator 5 transforms the common ground voltage value into a floating ground voltage value to control the voltage of each battery cell.

[0054] Step S5, by changing the voltages of the battery cells in the battery module input by the host computer 1, the voltage of the power battery module can be quickly adjusted.

[0055] The present invention can simulate the external characteristics of various types of power battery modules, including discharge characteristics and charging characteristics, and is used for power battery module characteristic simulation, fault presentation, and assisting research and learning. There are no chemical substances, ensuring the safety of experimental operations.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power battery module simulator capable of quickly adjusting voltage, characterized in that The battery module is composed of n battery cells, each of which can independently control the voltage of the battery cell. The voltages of the n battery cells are V1 - Vn respectively, and it includes: The host computer is used to input the voltages of the battery cells in the battery module. The programmable logic controller calculates the total output voltage and the control quantity of each battery cell, issues control instructions, controls the total output voltage of the programmable power supply, and controls the output voltage of the analog output module. The programmable power supply is used to receive the total output voltage from the programmable logic controller and control the total voltage supplied to the battery module according to the control instructions. The analog output module is used to receive the control quantity of the battery cell from the programmable logic controller and control the output common ground voltage value according to the control instructions. The signal isolator is used to convert the common ground voltage value into a floating ground voltage value to control the voltage of each battery cell. Among them, one signal isolator corresponds to one battery cell, and the signal isolator is connected to the battery cell through a programmable resistance circuit. The programmable logic controller, programmable power supply, analog output module, signal isolator, programmable resistance circuit and battery module are integratedly designed.

2. The power battery module simulator capable of quickly adjusting voltage according to claim 1, wherein In the programmable logic controller, the output voltage is fine-tuned through a fuzzy algorithm and a PID algorithm for closed-loop control.

3. A power battery module simulator capable of quickly adjusting voltage according to claim 1, characterized in that The host computer includes but is not limited to a touch screen, a computer configuration interface and a text screen.

4. A power battery module simulator capable of quickly adjusting voltage according to claim 1, characterized in that, The programmable logic controller controls the output voltage and current of the programmable power supply through the RS485 communication method, and the programmable logic controller outputs the control quantity of each battery cell to the analog output module through the RS485 communication method.

5. A power battery module simulator capable of quickly adjusting voltage according to claim 1, characterized in that, The programmable resistance circuit is composed of a proportional amplification circuit, a variable resistance device and a level shift circuit.

6. A power battery module simulator capable of quickly adjusting voltage according to claim 5, characterized in that, The proportional amplification circuit drives and controls the variable resistance device to present different DC resistances. The variable resistance device is connected in series with the level shift circuit and is used to limit the minimum voltage of each battery cell.

7. A power battery module simulator capable of quickly adjusting voltage according to claim 5, characterized in that, The variable resistance device includes but is not limited to a bipolar junction transistor and a field effect transistor.

8. A power battery module simulator capable of quickly adjusting voltage according to claim 5, characterized in that, The level shift circuit is one or more diodes connected in series.

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