A topology circuit for charge and discharge balance

Abstract

The application provides a charging and discharging balanced topology structure circuit, which comprises an input and output unit, a plurality of energy storage ports, an inductive element and a plurality of switch tubes. The input and output unit comprises a first port and a second port, which are used for being electrically connected with an external power supply or an external load circuit. The first port and the second port are used for being configured as a power input port or a power output port according to a preset control strategy. The plurality of energy storage ports are used for receiving the power supply delivered by the first port or the second port and outputting the power supply to the first port or the second port. The inductive element is used for transferring the power supply delivered by the first port or the second port to the energy storage port. The plurality of switch tubes are used for selectively connecting the inductive element between the first port, the second port and the plurality of energy storage ports to form a power transmission loop under different conduction combinations, so as to realize the charging and discharging balance of the plurality of energy storage ports. The application can effectively solve the safety and ensure the balance efficiency, and improve the flexibility.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging and discharging devices, in particular to a charging and discharging equalization topology circuit. BACKGROUND

[0002] With the continuous development of new energy technology, lithium ion batteries are widely used in electric vehicles and energy storage systems. Due to the differences in capacity, internal resistance and self-discharge rate of different single batteries, overcharging or overdischarging may occur when they are used in series and parallel connection, which may cause efficiency reduction and service life shortening, and even safety hazards.

[0003] The existing equalization circuits are mainly passive equalization and active equalization. Passive equalization dissipates energy through resistance, which has low efficiency, serious heat generation and low safety. Active equalization uses inductors, capacitors or DC-DC converters to transfer energy, which has high efficiency but complex circuit and limited speed. The above two methods cannot balance safety while ensuring equalization efficiency, and have low flexibility. SUMMARY

[0004] In order to solve the technical defects in the background art, the present application provides a charging and discharging equalization topology circuit, which can effectively balance safety while ensuring equalization efficiency and improve flexibility.

[0005] The application adopts the following technical solutions:

[0006] Optionally, a charging and discharging equalization topology circuit comprises:

[0007] An input and output unit, the input and output unit comprises a first port and a second port, the first port and the second port are respectively used for electrical connection with an external power supply or an external load circuit, and the first port and the second port are configured as a power input port or a power output port according to a preset control strategy;

[0008] A plurality of energy storage ports are electrically connected with the first port or the second port, and the plurality of energy storage ports are used for receiving power supplied by the first port or the second port and outputting power to the first port or the second port;

[0009] An inductive element is electrically connected between the input and output unit and the plurality of energy storage ports, and the inductive element is used for transferring power supplied by the first port or the second port to the energy storage port;

[0010] A plurality of switch tubes are arranged between the inductive element and the first port, the second port and the plurality of energy storage ports, and are used to selectively connect the inductive element to the first port, the second port and the plurality of energy storage ports to form power transmission loops under different combinations of switch tubes, so as to achieve balanced charging and discharging of the plurality of energy storage ports.

[0011] Optionally, when the first port is configured as a power input port and the second port is configured as a power output port, the first port is electrically connected to an external power source, the second port is electrically connected to an external load, and the plurality of energy storage ports are used to receive power from the first port and output power to the second port.

[0012] Optionally, when the second port is configured as a power input port and the first port is configured as a power output port, the second port is electrically connected to an external power source, the first port is electrically connected to an external load, and the plurality of energy storage ports are used to receive power from the second port and output power to the first port.

[0013] Optionally, the plurality of energy storage ports include a first energy storage port and a second energy storage port, the first energy storage port and the second energy storage port are respectively used to externally connect energy storage units, and the first energy storage port and the second energy storage port are selectively electrically connected to the first port or the second port under the control of the plurality of switch tubes, so that when the electric energy of the two energy storage units is inconsistent, the first energy storage port transmits electric energy to the second energy storage port or transmits electric energy from the second energy storage port to the first energy storage port.

[0014] Optionally, the plurality of switch tubes include:

[0015] a first switch, one end of the first switch being electrically connected to the second port, and the other end being electrically connected to the first energy storage port and the second energy storage port;

[0016] a second switch, one end of the second switch being electrically connected to the inductive element, and the other end being electrically connected to the first energy storage port;

[0017] a third switch, one end of the third switch being electrically connected between the second switch and the first energy storage port, and the other end being electrically connected between the second port and the first switch;

[0018] a fourth switch, one end of the fourth switch being electrically connected to the first port, and the other end being electrically connected to the second energy storage port;

[0019] a fifth switch, one end of the fifth switch being electrically connected between the fourth switch and the second energy storage port, and the other end being electrically connected between the inductive element and the second switch.

[0020] Optionally, when the fourth switch and the fifth switch are closed, the first switch, the second switch and the third switch are opened, the first port delivers electric energy to the inductive element or the inductive element outputs electric energy to the first port;

[0021] When the second switch and the third switch are closed, the first switch, the fourth switch and the fifth switch are opened, the second port delivers electric energy to the inductive element or the inductive element outputs electric energy to the second port.

[0022] Optionally, when the first switch and the fifth switch are closed, the second switch, the third switch and the fourth switch are opened, the second energy storage end delivers electric energy to the second port through the inductive element or the second port delivers electric energy to the second energy storage end through the inductive element.

[0023] Optionally, when the first switch and the second switch are closed, the third switch, the fourth switch and the fifth switch are opened, the first energy storage end delivers electric energy to the second port through the inductive element or the second port delivers electric energy to the first energy storage end through the inductive element.

[0024] Optionally, when the second switch and the fourth switch are closed, the first switch, the third switch and the fifth switch are opened, the first port delivers electric energy to the first energy storage end and the second energy storage end through the inductive element or the first energy storage end and the second energy storage end deliver electric energy to the first port.

[0025] Optionally, when the third switch and the fifth switch are closed, the first switch, the second switch and the fourth switch are opened, the first energy storage end and the second energy storage end deliver electric energy to the second port through the inductive element or the second port delivers electric energy to the first energy storage end and the second energy storage end through the inductive element.

[0026] In summary, the beneficial effects of the present application are:

[0027] By setting the first port and the second port, the first port and the second port can be configured as a power input terminal or a power output terminal according to an externally preset control strategy, and by setting a plurality of energy storage ports connected with the first port or the second port, the energy storage ports can receive the power supplied by the first port or the second port and / or supply power to the first port or the second port, and by setting an inductive element, the first port or the second port or the energy storage port can be temporarily stored or released, and by setting a plurality of switch tubes to be selectively turned on in different combinations, the inductive element can be connected between the first port, the second port and a plurality of the energy storage ports to form different power transmission loops, so as to balance the charging and discharging of the plurality of energy storage ports. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a schematic diagram of the overall circuit of the embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the embodiment of the present application as the first mode;

[0031] Figure 3 is a schematic diagram of the embodiment of the present application as the second mode;

[0032] Figure 4 is a schematic diagram of the embodiment of the present application as the third mode;

[0033] Figure 5 is a schematic diagram of the embodiment of the present application as the fourth mode;

[0034] Figure 6 is a schematic diagram of the embodiment of the present application as the fifth mode;

[0035] Figure 7 is a schematic diagram of the embodiment of the present application as the sixth mode.

[0036] 100, input and output unit; 110, first port; 120, second port;

[0037] 200, energy storage port; 210, first energy storage end; 220, second energy storage end;

[0038] L, inductive element;

[0039] 300, switch tube;

[0040] S1, first switch; S2, second switch; S3, third switch; S4, fourth switch; S5, fifth switch. DETAILED DESCRIPTION

[0041] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, rather than all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0042] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to the process, method, product or device.

[0043] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification indicates that the described feature, structure, or characteristic can be included in at least one embodiment. It is explicitly and implicitly appreciated by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] Reference should be made to Figure 1As shown, the application provides a charge-discharge balanced topology circuit, which comprises an input-output unit 100, a plurality of energy storage ports 200, an inductive element L and a plurality of switch tubes 300. The input-output unit 100 comprises a first port 110 and a second port 120, which are respectively used for electrical connection with an external power supply or an external load circuit. The first port 110 and the second port 120 are respectively configured as a power input port or a power output port according to a preset control strategy. The plurality of energy storage ports 200 are electrically connected with the first port 110 or the second port 120. The plurality of energy storage ports 200 are used for receiving power supplied by the first port 110 or the second port 120 and outputting power to the first port 110 or the second port 120. The inductive element L is electrically connected between the input-output unit 100 and the plurality of energy storage ports 200. The inductive element L is used for transferring power supplied by the first port 110 or the second port 120 to the energy storage ports 200. The plurality of switch tubes 300 are respectively arranged between the inductive element L and the first port 110, the second port 120 and the plurality of energy storage ports 200. The plurality of switch tubes 300 are used for selectively connecting the inductive element L to the first port 110, the second port 120 and the plurality of energy storage ports 200 to form a power transmission loop under different conduction combinations, so as to realize charge-discharge balance of the plurality of energy storage ports 200.

[0045] In the embodiment of the application, as shown in Figure 1As shown, the input and output unit 100 can include a first port 110 and a second port 120, which can be set by an external controller, by setting a preset control strategy, so that the first port 110 is a power input port, and the second port 120 is a power output port, or the first port 110 is a power input port, and the second port 120 is a power output port, wherein when it is a power output port, it is used to connect an external power supply, and when it is a power output port, it is used to connect an external load circuit. In an example, the energy storage port 200 can be multiple, preferably two, both of which are electrically connected to the first port 110 and the second port 120. When the first port 110 is configured as a power input port, the energy storage port 200 can receive power delivered from the first port 110, and when the second port 120 is configured as a power input port, the energy storage port 200 can receive power delivered from the second port 120. When the first port 110 is configured as a power output port, the energy storage port 200 can output power to the first port 110, and when the second port 120 is configured as a power output port, the energy storage port 200 can output power to the second port 120. By configuring the first port 110 and the second port 120 as a power input port or a power output port, when the two energy storage ports 200 connected to the energy storage system have inconsistent differences in capacity, internal resistance and self-discharge rate, it can output the energy storage system with higher voltage through the first port 110 or the second port 120, thereby achieving energy balance.

[0046] Specifically, as shown in Figures 1-7 By setting an inductor between the input and output unit 100 and the plurality of energy storage ports 200, one end of the inductor is electrically connected between the first port 110 and the second port 120, and the other end is electrically connected between the energy storage ports 200. By setting the inductor, the energy can be transferred by the electric energy instead of consuming the electric energy by the resistor in the traditional way, thereby reducing the loss and avoiding the heating condition.

[0047] Further, the switch tube 300 can be a one-way switch or a two-way switch. By setting different switch combinations, the first port 110 and the second port 120 can form a power transmission loop with the inductor L and the energy storage port 200, thereby realizing different power transmission loops, charging and discharging the energy storage port 200, and achieving the balance of charging and discharging the energy storage port 200.

[0048] Optionally, as shown in Figure 1As shown, when the first port 110 is configured as a power input port and the second port 120 is configured as a power output port, the first port 110 is electrically connected to an external power source and the second port 120 is electrically connected to an external load. The plurality of energy storage ports 200 are used to receive the power supplied by the first port 110 and to output power to the second port 120.

[0049] In this embodiment, when the first port 110 is configured as a power input port and the second port 120 is configured as a power output port, the first port 110 is electrically connected to an external power source, and the second port 120 is electrically connected to an external load. At this time, multiple energy storage ports 200 are selectively connected to the inductor L under the control of multiple switching transistors 300, thereby achieving dynamic power distribution among the power input port, the two energy storage ports 200, and the power output port. Specifically, the external power source provides electrical energy to the circuit through the first port 110. The inductor L temporarily stores and smooths the current under the control of the switching transistors 300, and the energy storage ports 200 play an energy buffering and balancing role in this process. If the voltage of a certain energy storage port 200 is detected to be lower than a preset threshold, the controller drives the switching transistors 300 to conduct, allowing that energy storage port 200 to be charged preferentially; conversely, if the voltage of a certain energy storage port 200 is detected to be higher than the threshold, its energy can be transferred to the second port 120 through the inductor for output to the external load, avoiding overcharging of a single unit. By using the first port 110 as the power input port and the second port 120 as the power output port, the external power supply provides energy to multiple energy storage ports 200 and the multiple energy storage ports 200 output to the load. The inductor L temporarily stores and transfers energy under the control of the switching transistor 300, enabling the system to efficiently adjust according to different voltage differences in Buck / Boost conversion mode. This avoids the problem of large energy dissipation in traditional passive balancing. Energy is dynamically allocated according to the voltage state of the energy storage ports 200, thereby preventing overcharging or over-discharging of individual batteries and improving the efficiency of energy transfer.

[0050] Optional, such as Figure 1 As shown, when the second port 120 is configured as a power input port and the first port 110 is configured as a power output port, the second port 120 is electrically connected to an external power source, and the first port 110 is electrically connected to an external load. The plurality of energy storage ports 200 are used to receive the power supplied by the second port 120 and to output power to the first port 110.

[0051] In the embodiment of the present application, when the second port 120 is configured as a power input port and the first port 110 is configured as a power output port, the second port 120 is connected with an external power supply, and the first port 110 is connected with an external load. At this time, the plurality of energy storage ports 200 receive electric energy from the second port 120 under the scheduling of the controller, and realize orderly charging of the energy storage ports 200 under the cooperation of the inductive element L and the switch tube 300; when the load needs energy, the energy storage ports 200 can output electric energy to the first port 110 via the inductive element L and the corresponding switch tube 300 combination, to ensure that the load works continuously and stably. By configuring the second port 120 as a power input port and the first port 110 as a power output port, each energy storage port 200 can be charged under different working conditions, and at the same time, the electric energy transmission from the external power supply to the external load can be realized, avoiding the problem of energy imbalance caused by the voltage difference of single batteries, and thus improving the flexibility and safety of the embodiment of the present application.

[0052] Optionally, as shown in Figure 1 The plurality of energy storage ports 200 include a first energy storage end 210 and a second energy storage end 220, the first energy storage end 210 and the second energy storage end 220 are respectively used for externally connecting energy storage units, and the first energy storage end 210 and the second energy storage end 220 are selectively electrically connected with the first port 110 or the second port 120 under the control of the plurality of switch tubes 300. When the electric energy of the two energy storage units is inconsistent, the first energy storage end 210 delivers electric energy to the second energy storage end 220, or delivers electric energy from the second energy storage end 220 to the first energy storage end 210.

[0053] In the embodiments of the present application, the plurality of energy storage ports 200 specifically includes a first energy storage end 210 and a second energy storage end 220, which are respectively used to externally connect energy storage units, such as single batteries or battery modules. The first energy storage end 210 and the second energy storage end 220 are selectively electrically connected with the first port 110 or the second port 120 under the control of the plurality of switch tubes 300, so as to form an electric energy transfer loop under different switch combinations. When the external detection circuit finds that the energy storage units corresponding to the first energy storage end 210 and the second energy storage end 220 have inconsistent electric energy, for example, the voltage of the first energy storage end 210 is higher than that of the second energy storage end 220, the external controller can trigger the conduction combination of the corresponding switch tube 300, so that the inductor L acts as an electric energy transfer element, first absorbs the excess energy of the first energy storage end 210 and temporarily stores it, and then outputs the electric energy through the first port 110 or the second port 120 (for example, when the first port 110 is configured as a power output port, the second port 120 releases the electric energy temporarily stored by the inductor to the second storage unit) to realize the electric energy transfer from the first energy storage end 210 to the second energy storage end 220. Conversely, when the electric energy of the second energy storage end 220 is higher than that of the first energy storage end 210, the second energy storage end 220 also outputs electric energy through the first port 110 or the second port 120, and the second energy storage end 220 transfers energy to the first energy storage end 210 through the inductor L to realize the energy transfer from the second energy storage end 220 to the first energy storage end 210.

[0054] For example, in a certain electric vehicle battery pack application, the voltage of the battery monomer connected to the first energy storage end 210 is 3.75V, and the voltage of the battery monomer connected to the second energy storage end 220 is 3.60V. When the system detects that there is a voltage difference of 150mV between the two, the external controller controls the switch tube 300 combination to form a charging loop between the first energy storage end 210 and the inductor L. In a short period of time, the inductor L absorbs the excess energy of the first energy storage end 210 and gradually increases the current; then the switch combination is switched, the inductor L releases energy to the first port 110, and then the external circuit delivers the electric energy temporarily stored by the inductor L to the second port 120, and the second port 120 delivers the received electric energy to the second energy storage end 220 to gradually increase the voltage of the second energy storage end 220. Through periodic repeated operation, the voltages of the two energy storage units gradually tend to be consistent, so as to realize the gradual consistency of the voltages of the energy storage system corresponding to the first energy storage end 210 and the energy storage system corresponding to the second energy storage end 220. If it is detected that the voltage of the second energy storage end 220 exceeds that of the first energy storage end 210, the energy transfer direction can be automatically switched to realize reverse equalization.

[0055] Optionally, as Figure 1As shown, the plurality of switching transistors 300 include a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, and a fifth switch S5. One end of the first switch S1 is electrically connected to the second port 120, and the other end is electrically connected to the first energy storage terminal 210 and the second energy storage terminal 220. One end of the second switch S2 is electrically connected to the inductor L, and the other end is electrically connected to the first energy storage terminal 210. One end of the third switch S3 is electrically connected between the second switch S2 and the first energy storage terminal 210, and the other end is electrically connected between the second port 120 and the first switch S1. One end of the fourth switch S4 is electrically connected to the first port 110, and the other end is electrically connected to the second energy storage terminal 220. One end of the fifth switch S5 is electrically connected between the fourth switch S4 and the second energy storage terminal 220, and the other end is electrically connected between the inductor L and the second switch S2.

[0056] In this embodiment, by setting multiple switching transistors 300, power input and output can be realized between the first port 110 and the second port 120, and bidirectional energy balancing can be performed between the first energy storage terminal 210 and the second energy storage terminal 220, thereby solving the problem of inconsistent battery cell voltages. This avoids the slow energy conversion efficiency and heat generation problems caused by traditional passive balancing methods, and also avoids the complex circuit structure of active balancing, thus improving the speed and flexibility of energy balancing.

[0057] Optional, such as Figure 2 As shown, when the fourth switch S4 and the fifth switch S5 are closed, and the first switch S1, the second switch S2 and the third switch S3 are open, the first port 110 supplies electrical energy to the inductor L, or the inductor L outputs electrical energy to the first port 110; when the second switch S2 and the third switch S3 are closed, and the first switch S1, the fourth switch S4 and the fifth switch S5 are open, the second port 120 supplies electrical energy to the inductor L, or the inductor L outputs electrical energy to the second port 120.

[0058] In this embodiment, when the first port 110 is configured as a power input port and the second port 120 is configured as a power output port, by opening the first switch S1, the second switch S2, and the third switch S3, and closing the fourth switch S4 and the fifth switch S5, the first port 110 charges the inductor L, thus forming a circuit. Conversely, if the first port 110 is configured as a power output port and the second port 120 is configured as a power input port, the inductor L outputs electrical energy to the first port 110, thus forming another circuit. This is the first mode of this embodiment.

[0059] likeFigure 3 As shown, when the first switch S1, the fourth switch S4, and the fifth switch S5 are open, and the second switch S2 and the third switch S3 are closed, the second port 120 charges the inductor L. If the second port 120 is configured as a power input port and the first port 110 is configured as a power output port, the inductor L discharges into the second port 120, thus achieving power balancing. This is the second mode of this embodiment.

[0060] Through the above technical solution, by setting the first mode and the second mode, a basic power path is established between the inductor L and the first port 110 and the second port 120, so that the inductor L can flexibly absorb and release power.

[0061] Optional, such as Figure 4 As shown, when the first switch S1 and the fifth switch S5 are closed, and the second switch S2, the third switch S3 and the fourth switch S4 are open, the second energy storage terminal 220 transmits electrical energy to discharge to the second port 120 through the inductor L, or the second port 120 transmits electrical energy to charge the second energy storage terminal 220 through the inductor L.

[0062] In this embodiment, when the second port 120 is configured as a power output port, the second energy storage terminal 220 supplies electrical energy to discharge through the inductor L. When the second port 120 is configured as a power input port, it supplies electrical energy to charge the second energy storage terminal 220 through the inductor L. Through this method, when the external detection circuit detects that the second energy storage terminal 220 is over-voltage or under-voltage compared to the first energy storage terminal 210, it can promptly output or input electrical energy, thereby maintaining the energy balance of the energy storage system corresponding to the first energy storage terminal 210 and the second energy storage terminal 220. By using different combinations of closing or opening the switching transistor 300, its flexibility is improved. In this embodiment, the third mode is described.

[0063] Optional, such as Figure 5 As shown, when the first switch S1 and the second switch S2 are closed, and the third switch S3, the fourth switch S4 and the fifth switch S5 are open, the first energy storage terminal 210 supplies electrical energy to discharge to the second port 120 through the inductor L, or the second port 120 supplies electrical energy to charge the first energy storage terminal 210 through the inductor L.

[0064] In the embodiment of the present application, when the first switch S1 and the second switch S2 are closed, and the third switch S3, the fourth switch S4 and the fifth switch S5 are disconnected, the first energy storage end 210, the inductive element L and the second port 120 form an energy transmission loop. When the second port 120 is configured as a power output port, the first energy storage end 210 will discharge electric energy to the second port 120 through the inductive element L; when the second port 120 is configured as a power input port, the second port 120 will charge the first energy storage end 210 through the inductive element L, thereby compensating for the insufficient electric energy of the first energy storage end 210. In the above manner, when the external detection circuit detects that the first energy storage end 210 has excessively high or excessively low voltage compared with the second energy storage end 220, the release or supplement of electric energy can be realized in time, so that the energy storage units corresponding to the first energy storage end 210 and the second energy storage end 220 can maintain electric energy balance. At the same time, the combination of the on-off of different switch tubes 300 enables the circuit to flexibly switch the energy flow direction according to the operating state, thereby avoiding the safety risk caused by the voltage difference between the battery monomers and improving the flexibility of the embodiment of the present application. At this time, the embodiment of the present application is in the fourth mode.

[0065] Optionally, as shown in FIG. 6, when the second switch S2 and the fourth switch S4 are closed, and the first switch S1, the third switch S3 and the fifth switch S5 are disconnected, the first port 110 charges the first energy storage end 210 and the second energy storage end 220 through the inductive element L, or the first energy storage end 210 and the second energy storage end 220 discharge to the first port 110. Figure 6

[0066] In the embodiment of the present application, when the second switch S2 and the fourth switch S4 are closed, and the first switch S1, the third switch S3 and the fifth switch S5 are disconnected, the first port 110, the inductive element L, the first energy storage end 210 and the second energy storage end 220 together form an energy transmission loop. When the first port 110 is configured as a power input port, the first port 110 can supply power to the inductive element L, and the inductive element charges the first energy storage end 210 and the second energy storage end 220 through the switch tube 300, thereby realizing the synchronous compensation of the two energy storage units; when the first port 110 is configured as a power output port, the first energy storage end 210 and the second energy storage end 220 can discharge to the first port 110 through the inductive element L, thereby providing electric energy for the external load. Specifically, when the external detection circuit detects that both the first energy storage end 210 and the second energy storage end 220 are in an under-voltage state, the electric energy of the first port 110 can be used to charge them in time, thereby improving the speed and efficiency of the balancing circuit, and further improving the flexibility of the balancing circuit of the present application. At this time, the embodiment of the present application is in the fifth mode.

[0067] Optionally, as shown in FIG. 6, when the second switch S2 and the fourth switch S4 are closed, and the first switch S1, the third switch S3 and the fifth switch S5 are disconnected, the first port 110 charges the first energy storage end 210 and the second energy storage end 220 through the inductive element L, or the first energy storage end 210 and the second energy storage end 220 discharge to the first port 110. Figure 7 ​As shown, when the third switch S3 and the fifth switch S5 are closed, and the first switch S1, the second switch S2 and the fourth switch S4 are opened, the first energy storage end 210 and the second energy storage end 220 discharge electric energy to the second port 120 through the inductive element L, or the second port 120 charges the first energy storage end 210 and the second energy storage end 220 through the inductive element L.

[0068] In the embodiment of the present application, when the third switch S3 and the fifth switch S5 are closed, and the first switch S1, the second switch S2 and the fourth switch S4 are opened, the first energy storage end 210 and the second energy storage end 220 form an energy transmission loop with the second port 120 through the inductive element L. When the second port 120 is configured as a power output port, the first energy storage end 210 and the second energy storage end 220 can release electric energy cooperatively, discharge to the second port 120 through the inductive element L, and then provide high-power electric energy support for an external load circuit. When the second port 120 is configured as a power input port, the second port 120 supplies power to the inductive element L, and the first energy storage end 210 and the second energy storage end 220 are charged synchronously through the switch tube 300, so as to compensate for the lack of electric energy of the first energy storage end 210 and the second energy storage end 220 at the same time. Specifically, when it is detected that the electric quantity of the first energy storage end 210 and the second energy storage end 220 is at a low level, the system can use the energy of the second port 120 to charge synchronously in double channels, which significantly shortens the charging time. When the electric quantity of the two energy storage ports 200 is sufficient, the energy can be output cooperatively, and the flexibility is further improved. At this time, the embodiment of the present application is the sixth mode.

[0069] The above is only one specific embodiment of the present application, and any improvement made on the basis of the concept of the present application is regarded as the protection scope of the present application.

Claims

1. A topology circuit for charge-discharge equalization, characterized by, The utility model relates to a kind of energy storage device, including: Input-output unit (100), the input-output unit (100) includes first port (110) and second port (120), the first port (110) and the second port (120) are used to be electrically connected with external power supply or external load circuit respectively, the first port (110) and the second port (120) are configured as power input port or power output port respectively according to preset control strategy; Multiple energy storage ports (200) are electrically connected with the first port (110) or second port (120), and the multiple energy storage ports (200) are used to receive power supplied by the first port (110) or second port (120) and output power to the first port (110) or second port (120); Inductive element (L) is electrically connected between the input-output unit (100) and the multiple energy storage ports (200), and the inductive element (L) is used to transfer power supplied by the first port (110) or second port (120) to the energy storage port (200); Multiple switch tubes (300) are respectively arranged between the inductive element (L) and the first port (110), the second port (120) and the multiple energy storage ports (200), and the multiple switch tubes (300) are used to selectively connect the inductive element (L) between the first port (110), the second port (120) and the multiple energy storage ports (200) to form a power transmission loop under different conduction combinations, so as to realize the charge-discharge balance of the multiple energy storage ports (200).

2. The topology circuit of claim 1, wherein, When the first port (110) is configured as a power input port and the second port (120) is configured as a power output port, the first port (110) is electrically connected with an external power supply, the second port (120) is electrically connected with an external load, and the multiple energy storage ports (200) are used to receive power supplied by the first port (110) and output power to the second port (120).

3. The topology circuit of claim 1, wherein, When the second port (120) is configured as a power input port and the first port (110) is configured as a power output port, the second port (120) is electrically connected with an external power supply, the first port (110) is electrically connected with an external load, and the multiple energy storage ports (200) are used to receive power supplied by the second port (120) and output power to the first port (110).

4. The topology circuit of claim 2 or 3, wherein, The plurality of energy storage ports (200) include a first energy storage port (210) and a second energy storage port (220), the first energy storage port (210) and the second energy storage port (220) are respectively used to externally connect an energy storage unit, the first energy storage port (210) and the second energy storage port (220) are selectively electrically connected with the first port (110) or the second port (120) under the control of a plurality of switch tubes (300), when the electric energy of the two energy storage units is inconsistent, the first energy storage port (210) delivers electric energy to the second energy storage port (220), or delivers electric energy from the second energy storage port (220) to the first energy storage port (210).

5. The topology circuit of claim 4, wherein, The plurality of switch tubes (300) include: A first switch (S1), one end of the first switch (S1) is electrically connected with the second port (120), and the other end is electrically connected with the first energy storage port (210) and the second energy storage port (220); A second switch (S2), one end of the second switch (S2) is electrically connected with the inductor (L), and the other end is electrically connected with the first energy storage port (210); A third switch (S3), one end of the third switch (S3) is electrically connected between the second switch (S2) and the first energy storage port (210), and the other end is electrically connected between the second port (120) and the first switch (S1); A fourth switch (S4), one end of the fourth switch (S4) is electrically connected with the first port (110), and the other end is electrically connected with the second energy storage port (220); A fifth switch (S5), one end of the fifth switch (S5) is electrically connected between the fourth switch (S4) and the second energy storage port (220), and the other end is electrically connected between the inductor (L) and the second switch (S2).

6. The topology circuit of claim 5, wherein, When the fourth switch (S4) and the fifth switch (S5) are closed, and the first switch (S1), the second switch (S2), and the third switch (S3) are opened, the first port (110) delivers electric energy to the inductor (L), or the inductor (L) outputs electric energy to the first port (110); When the second switch (S2) and the third switch (S3) are closed, and the first switch (S1), the fourth switch (S4), and the fifth switch (S5) are opened, the second port (120) delivers electric energy to the inductor (L), or the inductor (L) outputs electric energy to the second port (120).

7. The topology circuit of claim 5, wherein, When the first switch (S1) and the fifth switch (S5) are closed, and the second switch (S2), the third switch (S3), and the fourth switch (S4) are opened, the second energy storage port (220) delivers electric energy to the second port (120) through the inductor (L), or the second port (120) delivers electric energy to the second energy storage port (220) through the inductor (L).

8. The topology circuit of claim 5, wherein, When the first switch (S1) and the second switch (S2) are closed, and the third switch (S3), the fourth switch (S4) and the fifth switch (S5) are opened, the first energy storage end (210) discharges electric energy to the second port (120) through the inductive element (L), or the second port (120) charges electric energy to the first energy storage end (210) through the inductive element (L).

9. The topology circuit of claim 5, wherein, When the second switch (S2) and the fourth switch (S4) are closed, and the first switch (S1), the third switch (S3) and the fifth switch (S5) are opened, the first port (110) charges electric energy to the first energy storage end (210) and the second energy storage end (220) through the inductive element (L), or the first energy storage end (210) and the second energy storage end (220) discharge electric energy to the first port (110).

10. The topology circuit of claim 5, wherein, When the third switch (S3) and the fifth switch (S5) are closed, and the first switch (S1), the second switch (S2) and the fourth switch (S4) are opened, the first energy storage end (210) and the second energy storage end (220) discharge electric energy to the second port (120) through the inductive element (L), or the second port (120) charges electric energy to the first energy storage end (210) and the second energy storage end (220) through the inductive element (L).

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