Aviation high-voltage direct-current energy storage system and active equalization control circuit thereof

Abstract

The utility model relates to the technical field of aviation high-voltage direct-current energy storage, discloses an aviation high-voltage direct-current energy storage system and an active balance control circuit thereof, and aims to solve the problems that an existing active balance control circuit is complex in circuit and high in cost, and the scheme mainly comprises a control circuit, a matrix switching circuit and a voltage conversion circuit, the matrix switching circuit comprises change-over switch groups corresponding to the single batteries, the control circuit is connected with the control end of the matrix switching circuit and the control end of the voltage conversion circuit, and the single batteries are connected with one end of the voltage conversion circuit through the corresponding change-over switch groups. The other end of the voltage conversion circuit is connected with the battery pack, and the control circuit is configured to open or close the change-over switch group corresponding to each single battery and control the direction of the voltage conversion circuit. The complexity and the cost of the active equalization control circuit are reduced, and the active equalization control circuit is suitable for an aviation high-voltage direct-current energy storage system.

Description

Technical Field

[0001] The present application relates to the field of aviation high-voltage direct current energy storage technology, and in particular to an aviation high-voltage direct current energy storage system and an active balancing control circuit thereof. Background Art

[0002] With the rapid development of aviation HVDC energy storage systems, they are increasingly being used as emergency HVDC power supplies for aircraft, providing backup power. Aviation HVDC energy storage systems primarily consist of series-connected cells. Due to fluctuations in raw materials and production processes, the capacity, internal resistance, voltage, and self-discharge rate of these cells can vary. This, coupled with inconsistent attenuation during charge and discharge, can lead to voltage imbalances within the grouped cells. This can lead to a shortcoming in power supply capacity, a gradual reduction in available effective capacity, and, in severe cases, damage to the system.

[0003] Generally speaking, the main measure to solve the problem of single-cell battery consistency is balancing, which is divided into active balancing and passive balancing. Passive balancing mainly achieves balancing through resistor discharge. In batteries with higher voltages, excess electrical energy is released as heat through resistors, thereby reducing the voltage of the battery. This method is simple and low-cost, but it will lead to energy waste. The basic principle of active balancing is to transfer energy from one battery to another through components such as inductors or transformers, thereby achieving charge balance within the battery pack. In other words, balancing is achieved through charge transfer, which is more efficient and has lower losses. However, the active balancing control circuit structure is complex and the cost is relatively high. Utility Model Content

[0004] This application aims to solve the problems of complex circuits and high costs in active balancing control circuits of existing aviation high-voltage direct current energy storage systems, and proposes an aviation high-voltage direct current energy storage system and its active balancing control circuit.

[0005] The technical solution adopted by this application to solve the above technical problems is:

[0006] In a first aspect, the present application provides an active balancing control circuit for an aviation high-voltage direct current energy storage system. The aviation high-voltage direct current energy storage system includes a battery pack of multiple single cells connected in series, including a control circuit, a matrix switching circuit, and a voltage conversion circuit. The matrix switching circuit includes a switching switch group corresponding to each single cell. The control circuit is respectively connected to a control end of the matrix switching circuit and a control end of the voltage conversion circuit. The single cells are connected to one end of the voltage conversion circuit through the corresponding switching switch group, and the other end of the voltage conversion circuit is connected to the battery pack. The control circuit is configured to open or close the switching switch group corresponding to each single cell, and to control the direction of the voltage conversion circuit.

[0007] Furthermore, a fuse is included, the switch group includes two switches, and the single batteries are connected to the corresponding switches in sequence through the corresponding fuses.

[0008] Furthermore, the number of the single cells and the switch groups is N, the number of the fuses is N+1, and each fuse is respectively arranged at both ends of the battery group and between each two adjacent single cells.

[0009] Furthermore, the control circuit includes a controller and matrix control circuits corresponding to the number of single battery cells, and the controller is connected to the control end of the corresponding switch group through each matrix control circuit.

[0010] Furthermore, the matrix control circuit includes a photocoupler and a resistor, the photocoupler includes a light-emitting diode and a phototransistor, the control end of the controller is connected to the positive electrode of the light-emitting diode, the negative electrode of the light-emitting diode is grounded, the collector of the phototransistor is connected to the high-level input end, and the emitter of the phototransistor is connected to the control end of the corresponding switching switch group through a second resistor.

[0011] Furthermore, the controller is an MCU or a DSP.

[0012] Furthermore, it also includes a voltage acquisition device arranged in a one-to-one correspondence with the single battery, and the input end of each voltage acquisition device is connected to the control circuit.

[0013] Furthermore, the voltage conversion circuit is an isolated bidirectional DC / DC converter.

[0014] Furthermore, the switching switch group is a MOS tube group, and the MOS tube group includes two MOS tubes.

[0015] In a second aspect, the present application provides an aviation high-voltage direct current energy storage system, comprising the active balancing control circuit of the aviation high-voltage direct current energy storage system as described in the first aspect.

[0016] The beneficial effects of the present application are as follows: the aviation high-voltage direct current energy storage system and its active balancing control circuit provided by the present application realize the reuse of the active balancing control circuit through matrix control and matrix switching, thereby achieving the goal of lightweight design of the active balancing control circuit of the aviation high-voltage direct current energy storage system. Compared with the traditional active balancing control circuit, the circuit structure is simplified and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an active balancing control circuit for an aviation high-voltage direct current energy storage system provided in an embodiment of the present application;

[0018] Description of reference numerals:

[0019] 1-control circuit; 2-matrix switching circuit; 3-voltage conversion circuit; 11-controller; BAT1, BAT2, BAT3, ..., BATN-single battery; S11, S12, S21, S22, S31, S32, S41, ..., SN1, SN2-switches; Fuse1, Fuse2, Fuse3, Fuse4, ..., FuseN, FuseN+1-fuses; VP1, VP2, ..., VPN-photocouplers; R1, R2, ..., RN-resistors; VCC-high-level input terminal; BAT+-positive electrode of the battery pack; BAT--negative electrode of the battery pack. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0021] The technical solution of the embodiment of the present application is applicable to the application scenario of the aviation high-voltage direct current energy storage system. In order to reduce the complexity and cost of the active balancing control circuit, the technical solution of the present application is proposed. In the embodiment of the present application, the aviation high-voltage direct current energy storage system includes a battery pack of multiple single cells connected in series, and the active balancing control circuit includes a control circuit, a matrix switching circuit and a voltage conversion circuit. The matrix switching circuit includes a switching switch group corresponding to each single cell, and the control circuit is respectively connected to the control end of the matrix switching circuit and the control end of the voltage conversion circuit. The single cell is connected to one end of the voltage conversion circuit through the corresponding switching switch group, and the other end of the voltage conversion circuit is connected to the battery pack. The control circuit is configured to open or close the switching switch group corresponding to each single cell, and control the direction of the voltage conversion circuit.

[0022] Specifically, when a single cell needs to be balanced, the control circuit controls the corresponding switch group in the matrix switching circuit to conduct, so that the single cell can be charged or discharged to the battery pack through the voltage conversion circuit, thereby achieving active balancing of the single cell. The circuit structure of this application is simple and the cost is low.

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0024] See also Figure 1 The aviation high-voltage direct current energy storage system provided in an embodiment of the present application includes a battery pack consisting of multiple single-cell batteries BAT1, BAT2, ..., BATN connected in series. The active balancing control circuit of the aviation high-voltage direct current energy storage system includes a control circuit 1, a matrix switching circuit 2, and a voltage conversion circuit 3. The matrix switching circuit 2 includes a switching switch group corresponding to each single-cell battery BAT1, BAT2, ..., BATN. The control circuit 1 is respectively connected to the control end of the matrix switching circuit 2 and the control end of the voltage conversion circuit 3. The single-cell battery is connected to one end of the voltage conversion circuit 3 through the corresponding switching switch group, and the other end of the voltage conversion circuit 3 is connected to the battery pack. The control circuit 1 is configured to open or close the switching switch group corresponding to each single-cell battery and control the direction of the voltage conversion circuit 3.

[0025] See also Figure 1In the embodiment of the present application, each switching switch group includes two switching switches S11 and S12, S21 and S22, ..., SN1 and SN2 corresponding to the positive and negative poles of the single battery cells BAT1, BAT2, ..., BATN, wherein the first single battery cell BAT1 corresponds to the switching switch S11 and the switching switch S12, the negative pole of the first single battery cell BAT1 is connected to the negative pole of one end of the voltage conversion circuit 3 through the switching switch S11, the positive pole of the first single battery cell BAT1 is connected to the positive pole of one end of the voltage conversion circuit 3 through the switching switch S12, and the second single battery cell BAT2 Corresponding to switches S21 and S22, the negative electrode of the second battery cell BAT2 is connected to the negative electrode at one end of the voltage conversion circuit 3 via switch S21, and the positive electrode of the second battery cell BAT2 is connected to the positive electrode at one end of the voltage conversion circuit 3 via switch S22. Similarly, the Nth battery cell BATN corresponds to switches SN1 and SN2. The negative electrode of the Nth battery cell BATN is connected to the negative electrode at one end of the voltage conversion circuit 3 via switch SN1, and the positive electrode of the Nth battery cell BATN is connected to the positive electrode at one end of the voltage conversion circuit 3 via switch SN2. The positive electrode at the other end of the voltage conversion circuit 3 is connected to the positive electrode BAT+ of the battery pack, and the positive electrode at the other end of the voltage conversion circuit 3 is connected to the negative electrode BAT- of the battery pack.

[0026] In this embodiment of the present application, to protect the battery, fuses Fuse1, Fuse2, ..., and FuseN+1 are further included. The individual batteries BAT1, BAT2, ..., and BATN are sequentially connected to corresponding switches via corresponding fuses. The number of battery cells and switch groups is N, and the number of fuses is N+1. Each fuse is located at each end of the battery pack and between each pair of adjacent battery cells.

[0027] See also Figure 1 The negative electrode of the first single battery BAT1 is connected to the switch S11 through the fuse Fuse1, the positive electrode of the first single battery BAT1 is connected to the switch S12 and the switch S21 through the fuse Fuse2, the positive electrode of the second single battery BAT2 is connected to the switch S22 and the switch S31 through the fuse Fuse3, the positive electrode of the third single battery BAT3 is connected to the switch S32 and the switch S41 through the fuse Fuse4, and similarly, the positive electrode of the Nth single battery BATN is connected to the switch SN2 through the fuse FuseN+1.

[0028] In the embodiment of the present application, the control circuit 1 includes a controller 11 and matrix control circuits corresponding to the number of single battery cells. The controller 11 is connected to the control terminal of the corresponding switch group through each matrix control circuit. The matrix control circuit includes photocouplers VP1, VP2, ..., VPN and resistors R1, R2, ..., RN. The photocoupler includes a light-emitting diode and a phototransistor. The control terminal of the controller 11 is connected to the positive electrode of the light-emitting diode, the negative electrode of the light-emitting diode is grounded, the collector of the phototransistor is connected to the high-level input terminal VCC, and the emitter of the phototransistor is connected to the control terminal of the corresponding switch group through a resistor.

[0029] See also Figure 1 The controller 11 is connected to the control ends of the switching switches S11 and S12 through the photoelectric coupler VP1 and the resistor R1. When a high-level signal is input to the corresponding IO port of the controller 11, the light-emitting diode can be controlled to emit light, and then the photosensitive transistor can be controlled to turn on, so that the control ends of the switching switches S11 and S12 receive the high-level signal, thereby turning on the switching switches S11 and S12; the controller 11 is connected to the control ends of the switching switches S21 and S22 through the photoelectric coupler VP2 and the resistor R2. When a high-level signal is input to the corresponding IO port of the controller 11, the switching switches S21 and S22 can be controlled to turn on; by analogy, the controller 11 is connected to the control ends of the switching switches SN1 and SN2 through the photoelectric coupler VPN and the resistor RN. When a high-level signal is input to the corresponding IO port of the controller 11, the switching switches SN1 and SN2 can be controlled to turn on.

[0030] In the embodiment of the present application, the controller 11 may be an MCU or a DSP, but is not limited thereto. The controller 11 may also be another processor with processing and computing functions, such as a central processing unit. The voltage conversion circuit is an isolated bidirectional DC / DC converter. The switching switch group may be a MOS transistor group, i.e., two MOS transistors, whose corresponding control terminals are the gates of the MOS transistors.

[0031] In the embodiment of the present application, a voltage acquisition device may be provided corresponding to each single battery cell, and the input end of each voltage acquisition device is connected to the control circuit 1.

[0032] In practical applications, the voltage acquisition device collects the voltage of the corresponding single cell and sends it to the controller 11. The controller 11 can calculate and set the center voltage band based on the averaging method, and identify the single cells that require balancing based on the center voltage band. The controller 11 can output a 4-bit address code (e.g., 0001, indicating balancing channel control for single cell BAT1 in the battery pack) through four IO ports, controlling the decoder to output the corresponding high-level control signal, thereby achieving on / off control of the corresponding switch group.

[0033] If the first single cell BAT1 needs to be discharged for balanced charging, the control circuit 1 controls the corresponding switch group in the matrix switching circuit 2, namely switches S11 and S12, to be turned on. The control circuit 1 also controls the direction of the voltage conversion circuit 3 so that the first single cell BAT1 discharges into the battery pack through switches S11, S12, and the voltage conversion circuit 3. If the first single cell BAT1 needs to be charged for balanced charging, the direction of the voltage conversion circuit 3 is adjusted so that the battery pack charges the first single cell BAT1 through the voltage conversion circuit 3, switches S11, and S12. After balancing of the first single cell BAT1 is completed, switches S11 and S12 are controlled to be turned off. Active balancing is performed on the other single cells in the same manner.

[0034] In summary, the active balancing control circuit of the aviation high-voltage DC energy storage system provided in this application realizes the reuse of the active balancing control circuit through matrix control and matrix switching, thereby achieving the goal of lightweight design of the active balancing control circuit of the aviation high-voltage DC energy storage system. Compared with the traditional active balancing control circuit, the circuit structure is simplified and the cost is reduced.

[0035] Based on the above technical solution, an embodiment of the present application further proposes an aviation high-voltage direct current energy storage system, including the active balancing control circuit of the aviation high-voltage direct current energy storage system as described in the embodiment of the present application.

[0036] It can be understood that since the aviation high-voltage direct current energy storage system described in the embodiment of the present application includes the active balancing control circuit described in the embodiment, for the system disclosed in the embodiment, since it corresponds to the circuit disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the circuit, which will not be repeated here.

[0037] It should be noted that the present application provides only a specific structure of an aviation high-voltage direct current energy storage system and its active balancing control circuit. The relevant modules involved are all hardware system modules or functional modules that combine computer software programs or protocols with hardware in the prior art. The computer software programs or protocols involved in the functional modules are themselves technologies that are well known to those skilled in the art. They are not improvements to the present system and will not be described in detail here. The improvement of the present system is the interaction or connection relationship between the modules, that is, the improvement of the overall structure of the system to solve the corresponding technical problems to be solved by the present system.

Claims

1. An active balancing control circuit for an aviation high-voltage direct current energy storage system, wherein the aviation high-voltage direct current energy storage system comprises a battery pack of multiple single cells connected in series, characterized in that: The invention comprises a control circuit, a matrix switching circuit and a voltage conversion circuit. The matrix switching circuit includes a switching switch group corresponding to each single cell. The control circuit is connected to the control end of the matrix switching circuit and the control end of the voltage conversion circuit respectively. The single cell is connected to one end of the voltage conversion circuit through the corresponding switching switch group, and the other end of the voltage conversion circuit is connected to the battery pack. The control circuit is configured to open or close the switching switch group corresponding to each single cell and control the direction of the voltage conversion circuit.

2. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 1, characterized in that: It also includes a fuse, the switch group includes two switches, and the single batteries are connected to the corresponding switches in sequence through the corresponding fuses.

3. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 2, characterized in that: The number of the single cells and the switch groups is N, the number of the fuses is N+1, and each fuse is respectively arranged at both ends of the battery group and between each two adjacent single cells.

4. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 1, characterized in that: The control circuit includes a controller and matrix control circuits corresponding to the number of single battery cells. The controller is connected to the control end of the corresponding switching switch group through each matrix control circuit.

5. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 4, characterized in that: The matrix control circuit includes a photocoupler and a resistor. The photocoupler includes a light-emitting diode and a phototransistor. The control end of the controller is connected to the positive electrode of the light-emitting diode, the negative electrode of the light-emitting diode is grounded, the collector of the phototransistor is connected to the high-level input end, and the emitter of the phototransistor is connected to the control end of the corresponding switching switch group through a second resistor.

6. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 5, characterized in that: The controller is an MCU or a DSP.

7. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 1, characterized in that: It also includes voltage collection devices arranged in one-to-one correspondence with the single cells, and the input end of each voltage collection device is connected to the control circuit.

8. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 1, characterized in that: The voltage conversion circuit is an isolated bidirectional DC / DC converter.

9. The active balancing control circuit of the aviation high voltage direct current energy storage system according to claim 1, characterized in that: The switching switch group is a MOS tube group, and the MOS tube group includes two MOS tubes.

10. Aviation high voltage direct current energy storage system, characterized in that: The active balancing control circuit of the aviation high-voltage direct current energy storage system comprises the active balancing control circuit of any one of claims 1 to 9.

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