Electric energy conversion device and electric energy conversion system

Abstract

The utility model discloses an electric energy conversion device and an electric energy conversion system, and relates to the technical field of energy storage, the electric energy conversion device comprises a terminal port, a power conversion module and an energy storage module; the terminal port is connected with the power conversion module, and the power conversion module is connected with the energy storage module; the electric energy conversion devices are connected in parallel through the terminal ports. Therefore, the voltage of the energy storage module can be increased or reduced through the power conversion module, so that the compatibility and the flexibility of the device are higher, and the problem that the energy storage modules cannot be directly connected in parallel for use due to voltage difference, batches and the like is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage technical field especially, and relates to a kind of electric energy conversion device and a kind of electric energy conversion system. BACKGROUND

[0002] At present, when multiple energy storage modules are used in combination, they cannot be directly used in combination due to reasons such as pressure difference and batch, and have low compatibility. INVENTION CONTENTS

[0003] Based on the above problems, the utility model provides an electric energy conversion device and an electric energy conversion system to realize the combination use of energy storage modules and improve the compatibility of energy storage modules.

[0004] The utility model embodiment discloses the following technical scheme:

[0005] On the one hand, the application provides an electric energy conversion device, which comprises a terminal port, a power conversion module and an energy storage module;

[0006] The first end of the power conversion module is connected to the terminal port, and the second end of the power conversion module is connected to the energy storage module.

[0007] The electric energy conversion devices are connected in parallel through the first end of the power conversion module.

[0008] Optionally, the electric energy conversion devices are connected in parallel through the terminal port.

[0009] Optionally, the power conversion module comprises a power converter and a controller.

[0010] The terminal port is connected to the power converter, and the power converter is connected to the energy storage module.

[0011] The controller comprises a sampling end and a driving end, the sampling end is connected to the input end and the output end of the power converter, and the driving end is connected to the switch tube of the power converter.

[0012] Optionally, the electric energy conversion devices are connected in parallel through a connecting line.

[0013] Optionally, the terminal port comprises a first terminal port and a second terminal port, the first terminal port and the second terminal port are respectively arranged on two opposite surfaces of the electric energy conversion device, and the connection line of the first terminal port and the second terminal port in the electric energy conversion device is perpendicular to the surface where the first terminal port is located.

[0014] The electric energy conversion devices are connected in parallel through a connecting line or stacked in parallel.

[0015] Optionally, the topology circuit of the power converter is one of a boost topology circuit, a buck topology circuit, and a boost and buck topology circuit.

[0016] Optionally, the energy storage module is a super capacitor or a battery.

[0017] Optionally, the sampling end includes a voltage sampling end and a current sampling end.

[0018] In a second aspect, the application further provides an electric energy conversion system comprising a plurality of the electric energy conversion devices.

[0019] Optionally, in the case of discharging of the system, the output currents of the plurality of electric energy conversion devices are the same.

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

[0021] The application provides an electric energy conversion device and an electric energy conversion system. The electric energy conversion device comprises a terminal port, a power conversion module, and an energy storage module. The terminal port is connected to a first end of the power conversion module, and a second end of the power conversion module is connected to the energy storage module. The electric energy conversion devices are connected in parallel through the first ends of the power conversion modules. In this way, the voltage of the energy storage module can be raised or lowered through the power conversion module, so that the compatibility and flexibility of the device are higher, and the problem that the energy storage modules cannot be directly connected in parallel due to pressure difference, batch, and the like is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0023] Figure 1 FIG. 1 is a structural schematic diagram of an electric energy conversion device according to the application;

[0024] Figure 2 FIG. 2 is an energy flow schematic diagram of the electric energy conversion device according to the application when storing electric energy;

[0025] Figure 3 FIG. 3 is an energy flow schematic diagram of the electric energy conversion device according to the application when releasing electric energy;

[0026] Figure 4 FIG. 4 is a structural schematic diagram of another electric energy conversion device according to the application;

[0027] Figure 5 A connection schematic diagram of a controller and a power converter shown in the utility model;

[0028] Figure 6 When the electric energy conversion device shown in the utility model is stacked in parallel, the terminal port corresponds to a connection schematic diagram. DETAILED DESCRIPTION

[0029] As described above, the current multiple energy storage modules cannot be directly combined for use due to pressure difference, batch, etc., and have low compatibility.

[0030] In order to enable persons skilled in the art to better understand the utility model scheme, the technical solutions in the utility model embodiments will be clearly and completely described below with reference to the drawings in the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by persons skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] Referring to Figure 1 A structure schematic diagram of an electric energy conversion device, an electric energy conversion device, comprising a terminal port, a power conversion module and an energy storage module;

[0032] The first end of the power conversion module is connected with the terminal port, and the second end of the power conversion module is connected with the energy storage module.

[0033] The electric energy conversion devices are connected in parallel through the first end of the power conversion module.

[0034] Of course, the electric energy conversion devices can be directly connected in parallel through the terminal port.

[0035] The above-mentioned energy storage module can be a super capacitor or a battery and other components with electric energy storage characteristics.

[0036] The above-mentioned terminal port comprises a positive electrode and a negative electrode.

[0037] The above-mentioned power conversion module performs power conversion to increase or decrease the voltage of the energy storage module, thereby storing and releasing electric energy of the energy storage module. Referring to Figure 2 An energy flow schematic diagram of the electric energy conversion device when storing electric energy, the arrow indicates the energy flow direction, and when the electric energy conversion device performs energy supplement, the electric energy obtained from the direct current source is stored to the energy storage module through the terminal port and the power conversion module. Referring to Figure 3An energy flow diagram of an energy conversion device in energy release. When the energy conversion device releases energy, the energy released by the energy storage module is transmitted to the DC bus or external load through the terminal port via the power conversion module.

[0038] The power conversion module is used to boost and / or step down the voltage of the energy storage module, so that the energy conversion device can be current-balanced and energy-balanced when connected in parallel with other energy conversion devices. Current balancing means that the output current of the energy conversion device is the same as that of other connected energy conversion devices, thereby improving the compatibility of the energy storage module. Energy balancing means that the energy of multiple parallel energy conversion devices of the same specification tends to be consistent, for example, more energy is added to a low-energy energy conversion device.

[0039] The energy conversion device includes a power conversion module and an energy storage module. The power conversion module is used to boost or step down the voltage of the energy storage module, so that the energy storage module has higher compatibility. In addition, when multiple energy conversion devices are connected in parallel, the connection is made through the terminal port of the energy conversion device rather than the energy storage module, which can effectively solve the problem that the energy storage modules cannot be directly connected in parallel due to pressure difference, batch, etc.

[0040] Based on the above embodiment, refer to Figure 4 Another structure diagram of an energy conversion device is shown. The power conversion module includes a power converter and a controller.

[0041] The terminal port is connected to the power converter, and the power converter is connected to the energy storage module.

[0042] The controller includes a sampling end and a driving end. The sampling end is connected to the input end and the output end of the power converter, and the driving end is connected to the switch tube of the power converter.

[0043] The power converter mainly realizes energy storage and release of the energy storage module, and can boost and / or step down the energy storage module, so that the energy storage module has higher compatibility.

[0044] When storing energy, as Figure 2 the first end of the power converter connected to the terminal port is the input end, and the second end of the power converter connected to the energy storage module is the output end. When releasing energy, as Figure 3 the second end of the power converter connected to the energy storage module is the input end, and the first end of the power converter connected to the terminal port is the output end.

[0045] Refer to Figure 5A connection diagram of a controller and a power converter is shown. The sampling end of the controller can include current sampling ends for collecting input and output currents of the power converter, and the sampling end of the controller can also include voltage sampling ends for collecting input and output voltages of the power converter. The controller controls the switching tubes of the topology circuit of the power converter according to the collected voltage and current data, and controls the power converter to perform step-up or step-down.

[0046] Optionally, the topology circuit of the power converter can be a non-isolated topology circuit, such as Buck, Boost, Buck-Boost, etc., or an isolated topology circuit, such as Flyback, LLC, phase-shifted full-bridge, etc.

[0047] Optionally, the topology circuit of the power converter can be one of a step-up topology circuit, a step-down topology circuit, and a step-up and step-down topology circuit. Specifically, the power converter can be provided with a step-up topology circuit, such as a Boost step-up circuit; the power converter can also be provided with a step-down topology circuit, such as a Buck step-down circuit; and the power converter can also be provided with a topology circuit capable of achieving step-up and step-down, such as Buck-Boost, Flyback, LLC, phase-shifted full-bridge, etc.

[0048] Based on the above embodiments, multiple power conversion devices are connected in parallel to achieve expansion. The parallel connection between the power conversion devices can be wiring parallel connection or stacking parallel connection.

[0049] For wiring parallel connection, the power conversion device can be provided with only one terminal port. When connected in parallel, the positive electrode in the terminal port of another power conversion device can be connected to the positive electrode of the terminal port of the power conversion device through a connecting wire, and the negative electrode in the terminal port of another power conversion device can be connected to the negative electrode of the terminal port of the power conversion device through a connecting wire. Meanwhile, the positive and negative electrodes in the terminal port of the power conversion device can also be connected to other power conversion devices through connecting wires. In this way, the power conversion device can be provided with only one terminal port, saving cost. Of course, the power conversion device can also be provided with multiple terminal ports based on the output end of the power converter (when the power conversion device releases electric energy).

[0050] For stacking parallel connection, the power conversion device can be provided with two terminal ports, including a first terminal port and a second terminal port, which are arranged on two opposite surfaces of the power conversion device, and the connection lines of the first and second terminal ports are perpendicular to the surface where the first terminal port is located. For example, Figure 6 A connection diagram of a power conversion device when connected in stacking parallel connection is shown, Figure 6When the first and second electric energy conversion devices are stacked in parallel, the second terminal port of the first electric energy conversion device can be directly connected with the first terminal port of the second electric energy conversion device vertically, and the side surface of the first electric energy storage device is aligned with the side surface of the second electric energy conversion device, so that the side surface of the device is aligned during installation, and the corresponding installation of the terminal port is also facilitated. Of course, the second terminal port of the second electric energy conversion device can also be connected in parallel with the first terminal port of other electric energy conversion devices, so that the parallel connection of multiple electric energy conversion devices is achieved.

[0051] Further, based on the above-mentioned embodiments, the application also proposes an electric energy conversion system, which comprises multiple electric energy conversion devices as described above.

[0052] Optionally, when multiple electric energy conversion devices are connected in parallel, the connection can be selected to be wired in parallel or stacked in parallel. In one possible implementation, the connection can be selected to be wired in parallel, and the number and position of the terminal ports are less demanding. In another possible implementation, the connection can be selected to be stacked in parallel, which facilitates installation and reduces the connection lines. Of course, some electric energy conversion devices can be wired in parallel, and some electric energy conversion devices can be stacked in parallel.

[0053] The above-mentioned electric energy conversion system can supplement more electric energy to the electric energy conversion devices with low electric energy based on the power conversion modules of the electric energy conversion devices when the electric energy conversion system is supplemented with electric energy, so as to balance the electric energy among the electric energy conversion devices in the energy storage system, avoid that some electric energy conversion devices can still release electric energy while some electric energy conversion devices have run out of electric energy when discharging, and further avoid that the low electric energy of one or several electric energy conversion devices affects the subsequent discharge capacity and use effect of the energy storage system. When the energy storage system is discharging, the electric current of the electric energy conversion devices in the energy storage system can be made to flow uniformly based on the power conversion modules of the electric energy conversion devices.

[0054] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0055] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric energy conversion device, characterized by comprising: The device comprises a terminal port, a power conversion module and an energy storage module; The terminal port is connected to the first end of the power conversion module, and the second end of the power conversion module is connected to the energy storage module; The power conversion modules are connected in parallel between the electric energy conversion devices through the first ends of the power conversion modules.

2. The device according to claim 1, wherein The electric energy conversion devices are connected in parallel through the terminal ports.

3. The apparatus of claim 1, wherein, The power conversion module comprises a power converter and a controller; The terminal port is connected to the power converter, and the power converter is connected to the energy storage module; The controller comprises a sampling end and a driving end, the sampling end is connected to the input end and the output end of the power converter, and the driving end is connected to the switch tube of the power converter.

4. The apparatus of claim 1, wherein, The electric energy conversion devices are connected in parallel through the connecting lines.

5. The apparatus of claim 1, wherein, The terminal port comprises a first terminal port and a second terminal port, the first terminal port and the second terminal port are respectively arranged on two opposite surfaces of the electric energy conversion device, and the connecting lines of the first terminal port and the second terminal port in the electric energy conversion device are perpendicular to the surface on which the first terminal port is located. The electric energy conversion devices are connected in parallel or stacked in parallel through the connecting lines.

6. The apparatus of claim 3, wherein, The topology circuit of the power converter is one of a boost topology circuit, a buck topology circuit and a boost and buck topology circuit.

7. The apparatus of claim 1, wherein, The energy storage module is a super capacitor or a battery.

8. The apparatus of claim 3, wherein, The sampling end comprises a voltage sampling end and a current sampling end.

9. An electric energy conversion system, characterized by A plurality of the electric energy conversion devices according to any one of claims 1-8 are included.

10. The system of claim 9, wherein, In the case of discharging of the system, the output currents of the plurality of electric energy conversion devices are the same.

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