Battery load hybrid conversion simulation test device and control method thereof

Abstract

The invention relates to the technical field of power systems, and provides a battery load hybrid conversion simulation test device and a control method thereof.The battery load hybrid conversion simulation test device comprises a switching module and two or more DC-DC modules, each DC-DC module is connected with the switching module, and each DC-DC module is used for being connected with a battery; and the switching module is provided with an external test port and is used for switching lines to enable the external test port to be communicated with different DC-DC modules, and in combination with the mode of the DC-DC modules and / or the change of battery roles, circular flow of electric energy among different batteries is realized, a constant-current load is provided, or the constant-current load and the batteries are provided at the same time. Various tests required by the development of the power supply system can be efficiently completed in the circulating process of the battery, so that the test time is remarkably shortened, and the consumption of electric energy is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply systems, and in particular to a battery load hybrid conversion simulation test device and a control method thereof. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In the development process of power monitoring equipment, it is often necessary to perform a series of logical control operations on the battery (such as setting the charging current limit) and accumulate statistics of information (such as recording the charging and discharging power). These test operations often require a long waiting time and consume more power. This is mainly due to two reasons: first, it is necessary to wait until the battery is fully charged before performing the discharge test; second, in order to perform the charging current limit test, it is necessary to discharge part of the battery's power within a certain period of time to obtain a certain charging current. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a battery load hybrid conversion simulation test device and a control method thereof. By cleverly utilizing multiple batteries to be connected to multiple DC-DC conversion modules respectively, the circulation of electric energy between the batteries is achieved. In this way, various tests required for power system development can be efficiently completed during the battery circulation process, which not only significantly shortens the test time, but also greatly reduces the consumption of electric energy.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A first aspect of the present invention provides a battery load hybrid conversion simulation test device.

[0007] A battery load hybrid conversion simulation test device comprises a switching module and two or more DC-DC modules, each DC-DC module is connected to the switching module, and each DC-DC module is used to connect a battery;

[0008] The switching module is provided with an external test port for switching the line so that the external test port is connected to different DC-DC modules, and combined with the change of the mode of the DC-DC module and / or the role of the battery, the electric energy is circulated between different batteries to provide a constant current load or a constant current load and a battery at the same time.

[0009] Furthermore, different batteries have different battery capacities.

[0010] Furthermore, the switching module is connected to the power supply module through an external test port.

[0011] A second aspect of the present invention provides a control method for a battery load hybrid conversion simulation test device, comprising the following steps:

[0012] The control switch module switches the circuit to connect the external test port with different DC-DC modules, and controls the mode of the DC-DC module and / or the change of the battery role, so as to realize the circulation of electric energy between different batteries, provide a constant current load, or provide a constant current load and a battery at the same time.

[0013] Furthermore, in the constant current load test mode, after selecting the battery with the lowest battery capacity as the selected operation object, the switching module is controlled to switch the line so that the external test port is connected to the DC-DC module corresponding to the selected operation object, and the output current limiting value of the output end of the DC-DC module corresponding to each selected operation object is controlled to ensure that the external test port obtains a stable constant current load.

[0014] Furthermore, the output end of the DC-DC module corresponding to the selected operation object is an end of the DC-DC module connected to the battery.

[0015] Furthermore, the output current limiting value is:

[0016] Ib=(UaIa) / (ηUb) Wherein, Ia is the constant current load at the input end of the DC-DC module, Ua is the external test port voltage, Ub is the voltage at the output end of the DC-DC module, and η is the conversion efficiency of the DC-DC module.

[0017] Furthermore, in the constant current load and battery test mode, when the battery is in a charging state, the battery with the lowest battery capacity is selected as the charging battery, and the remaining batteries are used as constant current load batteries. The external test port is simultaneously connected to the DC-DC module corresponding to the charging battery and the DC-DC module corresponding to the constant current load battery. The DC-DC module corresponding to the charging battery is set to a pass-through mode, and the external test port is used as a power supply to charge the battery, and the battery current and voltage are obtained through the DC-DC module.

[0018] Furthermore, in the through mode, the voltages at the input and output ends of the DC-DC module are equal.

[0019] Furthermore, in the constant current load and battery test mode, when the battery is in a discharging state, the battery with the highest battery capacity is selected as the discharging battery, and the remaining batteries are used as constant current load batteries. The external test port is simultaneously connected to the DC-DC module corresponding to the discharging battery and the DC-DC module corresponding to the constant current load battery. The DC-DC module is used to control the discharging of the discharging battery to the constant current load battery, simulating the battery discharging process, and collecting the battery voltage and current.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The battery load hybrid conversion simulation test device described in the present invention realizes the circulation of electric energy between batteries by cleverly utilizing multiple batteries connected to multiple DC-DC conversion modules respectively. In this way, various tests required for power system development can be efficiently completed during the battery circulation process, which not only significantly shortens the test time, but also greatly reduces the consumption of electric energy.

[0022] The battery load hybrid conversion simulation test device described in the present invention can make the test process more flexible by exchanging the battery roles, so as to adapt to different test requirements.

[0023] The battery load hybrid conversion simulation test device described in the present invention has accurate charge and discharge current limiting control, which ensures the safety of battery operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 This is a structural diagram of a battery load hybrid conversion simulation test device according to Example 1 of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0030] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0031] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0032] Example 1

[0033] Embodiment 1 of the present invention provides a battery load hybrid conversion simulation test device.

[0034] The battery load hybrid conversion simulation test device provided in this embodiment realizes the circulation of electric energy between the two batteries by cleverly utilizing two batteries (one fully charged and one discharged) or multiple batteries connected to two or more DC-DC conversion modules. In this way, various tests required for power system development can be efficiently completed during the battery circulation process. This method not only significantly shortens the test time, but also greatly reduces the consumption of electric energy.

[0035] This embodiment provides a battery load hybrid conversion simulation test device, such as Figure 1 As shown, it includes a control module (control unit), two or more DC-DC modules and a switching module (switching unit).

[0036] Each DC-DC module is used to connect a battery. Figure 1 As shown, the number n of DC-DC modules is equal to the number N of batteries, and a battery is connected to a port B of each DC-DC module.

[0037] The control module is connected to the monitoring module, the DC-DC module and the switching module respectively. Specifically, each DC-DC module is connected to the control module through a bus, the control module is connected to the monitoring module, and the control module is connected to the switching module.

[0038] The switching module is also connected to all DC-DC modules. Specifically, the switching module is connected to port A of each DC-DC module.

[0039] The switching module is also connected to the power supply module via the external test port.

[0040] Thus, the hardware part of the overall power battery conversion simulation test device is constructed.

[0041] In this embodiment, the switching module connects the external test port to different DC-DC modules by switching the lines, and combines the mode of the DC-DC module and / or the change of the battery role to realize the circulation of electric energy between different batteries, providing a constant current load or providing a constant current load and a battery at the same time.

[0042] The battery load hybrid conversion simulation test device provided in this embodiment has the following advantages:

[0043] (1) High efficiency: The recycling of electric energy significantly improves the efficiency of testing;

[0044] (2) Flexibility: The interchangeability of battery roles makes the testing process more flexible and adaptable to different testing requirements;

[0045] (3) Energy saving: It reduces the power consumption during the test process, which conforms to the design concept of green environmental protection;

[0046] (4) Safety: Accurate charge and discharge current limiting control ensures the safety of battery operation.

[0047] Example 2

[0048] Embodiment 2 of the present invention provides a control method for a battery load hybrid conversion simulation test device as in Embodiment 1.

[0049] The present embodiment provides a control method for a battery load hybrid conversion simulation test device, which has two modes: one is a constant current load test mode, and the other is a constant current load and battery test mode.

[0050] The present embodiment provides a control method for a battery load hybrid conversion simulation test device, comprising the following steps:

[0051] Step 1: Set the constant current load test mode to initialize the battery load mixed conversion simulation test device.

[0052] Step 2: The control module queries the battery BMS management system through the communication interface to obtain battery information, or collects the battery voltage through the DC-DC module, thereby matching the battery with the lowest battery capacity and determining it as the selected operation object.

[0053] Step 3: Based on the determination of the selected operation object, the control module controls the switching module to switch the line so that the external test port is connected to the DC-DC module corresponding to the selected operation object.

[0054] Step 4: The control module sends an execution instruction to the DC-DC module corresponding to each selected operation object, so that port A is used as the input end and port B is used as the output end, and then the constant current load Ia can be obtained through calculation.

[0055] According to the principle of energy conservation, the input power Pa of port A must be equal to the output power Pb of port B multiplied by the conversion efficiency η of the DC-DC module:

[0056] Pa=ηPb

[0057] Further, power can be expressed as the product of voltage and current:

[0058] UaIa=ηUbIb

[0059] Among them, Ua and Ia are the voltage and current of port A respectively; Ub and Ib are the voltage and current of port B respectively.

[0060] In order to achieve the constant current load Ia on the port A side, the control unit will set the appropriate port B voltage Ub according to the test port voltage Ua and the current battery voltage, and calculate the required output current limit value Ib by the following formula:

[0061] Ib=(UaIa) / (ηUb)

[0062] By precisely controlling the output current limit value Ib of port B, it is ensured that the external test interface can obtain a stable constant current load Ia.

[0063] Step 5: In the constant current load and battery test mode, the control unit confirms the working state of the battery, which includes the charging state and the discharging state.

[0064] Step 6: Determine and select an operation object based on the working status of the battery.

[0065] When the battery is in the charging state, the matching selection operation object is the battery with lower capacity, and the battery with the lowest capacity is used as the charging battery, and the remaining batteries are used as constant current load batteries, so that the external test port is simultaneously connected to the DC-DC module corresponding to the charging battery A and the DC-DC module corresponding to the constant current load battery B. Set the DC-DC module corresponding to the charging battery A to the pass-through mode, that is, the voltage of port A is equal to the voltage of port B. At this time, the external test port can be used as a power supply to charge the charging battery A. At this time, the DC-DC module corresponding to the charging battery A works in the pass-through mode, and the control unit obtains the current and voltage information of the charging battery A through the DC-DC module.

[0066] When the battery is in the discharge state, the matching operation object is selected as the battery with higher capacity, and the battery with the highest capacity is used as the discharge battery, and the remaining batteries are used as constant current load batteries, so that the external test port is simultaneously connected to the DC-DC module corresponding to the discharge battery A and the DC-DC module corresponding to the constant current load battery B. The control module controls the discharge battery A to discharge the constant current load battery B through the DC-DC module, simulates the battery discharge process, and transmits the collected voltage and current information of the discharge battery A to the external monitoring device.

[0067] Role swap: In the discharge test, the roles of battery A and battery B can be swapped. When battery A is discharged to empty and battery B is full, the roles can be switched so that battery B acts as a discharge battery and battery A acts as a constant current load. This method not only saves the waiting time of the discharge test, but also reduces power consumption.

[0068] In different test scenarios, the battery-load hybrid conversion simulation test device can provide a constant current load or a constant current load and a battery at the same time.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery load hybrid conversion simulation test device, characterized in that: It includes a switching module and two or more DC-DC modules, each DC-DC module is connected to the switching module, and each DC-DC module is used to connect a battery; The switching module is provided with an external test port for switching the line so that the external test port is connected to different DC-DC modules, and combined with the change of the mode of the DC-DC module and / or the role of the battery, the electric energy is circulated between different batteries to provide a constant current load or a constant current load and a battery at the same time.

2. A battery load hybrid conversion simulation test device as claimed in claim 1, characterized in that: Different batteries have different battery capacities.

3. A battery load hybrid conversion simulation test device as claimed in claim 1, characterized in that: The switching module is connected to the power supply module through the external test port.

4. A control method for a battery load hybrid conversion simulation test device, characterized in that: include: The control switch module switches the circuit to connect the external test port with different DC-DC modules, and controls the mode of the DC-DC module and / or the change of the battery role, so as to realize the circulation of electric energy between different batteries, provide a constant current load, or provide a constant current load and a battery at the same time.

5. The control method of a battery load hybrid conversion simulation test device as claimed in claim 4, characterized in that: In the constant current load test mode, after selecting the battery with the lowest battery capacity as the selected operation object, the switching module is controlled to switch the line so that the external test port is connected to the DC-DC module corresponding to the selected operation object, and the output current limiting value of the output end of the DC-DC module corresponding to each selected operation object is controlled to ensure that the external test port obtains a stable constant current load.

6. The control method of a battery load hybrid conversion simulation test device as claimed in claim 5, characterized in that: The output end of the DC-DC module corresponding to the selected operation object is an end of the DC-DC module connected to the battery.

7. The control method of a battery load hybrid conversion simulation test device as claimed in claim 5, characterized in that: The output current limit value is: Ib=(UaIa) / (ηUb) Wherein, Ia is the constant current load at the input end of the DC-DC module, Ua is the external test port voltage, Ub is the voltage at the output end of the DC-DC module, and η is the conversion efficiency of the DC-DC module.

8. The control method of a battery load hybrid conversion simulation test device as claimed in claim 4, characterized in that: In the constant current load and battery test mode, when the battery is in the charging state, the battery with the lowest battery capacity is selected as the charging battery, and the remaining batteries are used as constant current load batteries. The external test port is connected to the DC-DC module corresponding to the charging battery and the DC-DC module corresponding to the constant current load battery at the same time. The DC-DC module corresponding to the charging battery is set to the pass-through mode, and the external test port is used as a power supply to charge the battery, and the battery current and voltage are obtained through the DC-DC module.

9. The control method of a battery load hybrid conversion simulation test device as claimed in claim 8, characterized in that: The through mode is that the voltages at the input and output ends of the DC-DC module are equal.

10. The control method of a battery load hybrid conversion simulation test device according to claim 4, characterized in that: In the constant current load and battery test mode, when the battery is in the discharge state, the battery with the highest battery capacity is selected as the discharge battery, and the remaining batteries are used as constant current load batteries. The external test port is connected to the DC-DC module corresponding to the discharge battery and the DC-DC module corresponding to the constant current load battery at the same time. The discharge battery is controlled by the DC-DC module to discharge the constant current load battery, simulating the battery discharge process and collecting the battery voltage and current.

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