Charging station system

Abstract

The invention discloses a charging station system. The charging station system comprises an alternating current input end, a charging port and an alternating current-to-direct current converter, wherein the alternating current input end is used for being electrically connected with an external alternating current power distribution network; the charging port is used for being electrically connected with an external vehicle; the alternating current-to-direct current converter is electrically connected with the alternating current input end and the charging port; the alternating current-to-direct current converter is used for converting alternating current input by the alternating current input end into direct current and charging the vehicle through the charging port.

Description

Technical Field

[0001] The present application relates to the field of transportation vehicles, and more specifically to a charging control method and device for an on-board charger, and an on-board charger. Background Art

[0002] As the number of electric vehicles increases, the number of charging station systems also needs to increase accordingly to meet the charging needs of users. In the related art, the number of converters required in the charging station system is large, which increases the cost of the charging station system. Summary of the invention

[0003] The present application is proposed to solve at least one of the above problems. According to the first aspect of the present application, a charging station system is provided, the charging station system comprising: an AC input terminal, a charging port and an AC-to-DC converter; wherein the AC input terminal is used to electrically connect to an external AC distribution network; the charging port is used to electrically connect to an external vehicle; the AC-to-DC converter is electrically connected to the AC input terminal and the charging port; the AC-to-DC converter is used to convert the AC power input from the AC input terminal into DC power, and charge the vehicle through the charging port.

[0004] In one embodiment of the present application, the AC input terminal includes: at least one live wire terminal; the AC-to-DC converter includes: a DC output terminal and at least one AC-to-DC branch; wherein the DC output terminal is electrically connected to the charging port; each of the AC-to-DC branches is electrically connected between the corresponding live wire terminal and the DC output terminal, and each of the AC-to-DC branches is used to convert the AC power input from the corresponding live wire terminal into DC power and transmit it to the DC output terminal.

[0005] In one embodiment of the present application, the AC-DC branch includes: a first primary bridge arm and a second primary bridge arm connected in parallel, wherein the midpoint of the first primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a first inductor, and the midpoint of the second primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a second inductor; the positive busbars of the first primary bridge arm and the second primary bridge arm are the first positive busbars, and the negative busbars of the first primary bridge arm and the second primary bridge arm are the second negative busbars; the AC-DC branch also includes: a transformer circuit, the transformer circuit includes a transformer primary and a transformer secondary; wherein the positive busbar of the transformer primary is The positive pole of the first secondary bridge arm is electrically connected to the midpoint of the bridge arm of the first primary bridge arm, and the negative pole of the primary side of the transformer is electrically connected to the midpoint of the bridge arm of the second primary bridge arm; the AC-DC branch also includes: a first secondary bridge arm and a second secondary bridge arm connected in parallel, wherein the midpoint of the bridge arm of the first secondary bridge arm is electrically connected to the positive pole of the secondary side of the transformer, and the midpoint of the bridge arm of the second secondary bridge arm is electrically connected to the negative pole of the secondary side of the transformer; the positive busbars of the first secondary bridge arm and the second secondary bridge arm are the second positive busbars, and the second positive busbars are electrically connected to the positive pole of the DC output terminal; the negative busbars of the first secondary bridge arm and the second secondary bridge arm are the second negative busbars, and the second negative busbars are electrically connected to the negative pole of the DC output terminal.

[0006] In one embodiment of the present application, the positive pole of the primary side of the transformer is electrically connected to the midpoint of the bridge arm of the first primary side bridge arm through a third inductor.

[0007] In one embodiment of the present application, the AC input end includes three live wire ends, and the AC-to-DC converter includes three AC-to-DC branches; the first primary bridge arm and the second primary bridge arm in the three AC-to-DC branches are connected in parallel between the common first positive bus and the first negative bus.

[0008] In one embodiment of the present application, the charging station system further includes: an energy storage battery cluster and a first DC converter; a first end of the first DC converter is electrically connected to the energy storage battery cluster, a second end of the first DC converter is electrically connected to the charging port in a switchable manner, and a second end of the first DC converter is also electrically connected to a DC output end of the AC-to-DC converter in a switchable manner.

[0009] In one embodiment of the present application, the charging station system further includes: a first switch, wherein a first current-passing end of the first switch is electrically connected to a second end of the first DC converter, and a second current-passing end of the first switch is electrically connected to the charging port and a DC output end of the AC-to-DC converter.

[0010] In one embodiment of the present application, the number of energy storage battery clusters, the number of the first DC converters, and the number of the first switches are equal, and are all at least two; each of the energy storage battery clusters is electrically connected to the first end of the corresponding first DC converter, the second end of each of the first DC converters is electrically connected to the first current-passing end of the corresponding first switch, and the second current-passing end of each of the first switches is electrically connected to the charging port and the DC output end.

[0011] In one embodiment of the present application, the number of the AC-to-DC converters is equal to the number of the first switches, and each of the AC-to-DC converters has a DC output terminal; the second current-passing end of each of the first switches is electrically connected to the DC output terminal of the corresponding AC-to-DC converter.

[0012] In one embodiment of the present application, the charging station system further includes: a second switch, wherein a first current-passing end of the second switch is electrically connected to the charging port, and a second current-passing end of the second switch is electrically connected to at least a portion of the DC output end and at least a portion of the second current-passing end of the first switch.

[0013] In one embodiment of the present application, the number of the charging ports is at least two, and each of the charging ports is electrically connected to the first current-passing end of the second switch.

[0014] In one embodiment of the present application, the number of the second switches is equal to the number of the charging ports; each of the charging ports is electrically connected to the first current-passing end of the corresponding second switch, and the second current-passing end of each of the second switches is electrically connected to at least part of the DC output end and at least part of the second current-passing end of the first switch.

[0015] In one embodiment of the present application, the charging station system further includes: a photovoltaic component and a second DC converter; the first end of the second DC converter is electrically connected to the photovoltaic component, the second end of the second DC converter is electrically connected to the first end of the first DC converter in a switchable manner, and the second end of the second DC converter is also electrically connected to the energy storage battery cluster in a switchable manner.

[0016] In one embodiment of the present application, the charging station system further includes: a third switch, wherein a first current-passing end of the third switch is electrically connected to a second end of the second DC converter, and a second current-passing end of the third switch is electrically connected to a first end of the first DC converter and the energy storage battery cluster.

[0017] In one embodiment of the present application, the charging station system further includes: a fourth switch, a first current-passing end of the fourth switch electrically connected to the second end of the second DC converter, and a second current-passing end of the fourth switch electrically connected to the charging port.

[0018] In one embodiment of the present application, the charging port is a charging gun for charging the vehicle.

[0019] According to the charging station system provided in the embodiment of the present application, by setting only one AC-to-DC converter between the AC input terminal and the charging port, the AC power input from the AC distribution network is converted into DC at one level and then the vehicle can be charged through the charging port, thereby reducing the number of converters and reducing the cost of the charging station system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 and Figure 2 A topological structure diagram of a charging station system in the related art;

[0022] Figure 3 A circuit diagram of a charging station system according to an embodiment of the present invention;

[0023] Figure 4 A circuit diagram of an AC-to-DC branch circuit according to an embodiment of the present invention;

[0024] Figure 5 A circuit diagram of an AC-to-DC branch circuit according to another embodiment of the present invention;

[0025] Figure 6 A circuit diagram of a charging station system according to another embodiment of the present invention;

[0026] Figure 7 A circuit diagram of a charging station system according to another embodiment of the present invention;

[0027] Figure 8 A circuit diagram of a charging station system according to another embodiment of the present invention;

[0028] Fig. 9 A circuit diagram of a charging station system according to another embodiment of the present invention;

[0029] Fig.10 This is a circuit diagram of a charging station system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0031] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0032] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0033] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, confirm the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0034] The topological structure of current industry charging piles and energy storage systems is as follows: Figure 1 and Figure 2 As shown, the three-phase AC power of the AC distribution network is converted into high-voltage DC power through a transformer and AC-DC (AC to DC converter), and the photovoltaic modules, energy storage batteries, and DC charging guns for electrically connecting electric vehicles are connected to the bus through DC-DC (DC to DC converter). From the AC distribution network to the electric vehicle, it is necessary to pass through two-stage converters, AC-DC and DC-DC, and a large number of converters are required, which increases the cost of the charging station system. In addition, the power of the charging pile system is usually hundreds of kilowatts to megawatts, that is, the power of AC-DC and DC-DC is hundreds of kilowatts to megawatts, which results in the large size, heavy weight, and high cost of the entire charging station system, and the charging station system is expensive. In order to solve at least some of the problems shown above, the present application proposes the following embodiments.

[0035] In order to fully understand the present invention, a detailed structure will be proposed in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail as follows, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0036] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] First, an application scenario of the charging station system illustrated in the example of the present application is introduced. The charging station system is applied in the process of charging a vehicle.

[0038] refer to Figure 3 An embodiment of the present application provides a charging station system, which includes: an AC input terminal, a charging port and an AC-to-DC converter; wherein the AC input terminal is used to electrically connect to an external AC distribution network; the charging port is used to electrically connect to an external vehicle; the AC-to-DC converter is electrically connected to the AC input terminal and the charging port; the AC-to-DC converter is used to convert the AC power input from the AC input terminal into DC power, and charge the vehicle through the charging port.

[0039] In the above scheme, only one AC to DC converter is provided between the AC input terminal and the charging port, so that the AC power input from the AC distribution network is converted to DC at the first level and then the vehicle can be charged through the charging port, thereby reducing the number of converters and the cost of the charging station system. The above structures are described in detail below in conjunction with the accompanying drawings.

[0040] When setting the AC input terminal, refer to Figure 3 , the AC input terminal is used to electrically connect to the AC distribution network. The AC distribution network refers to the power grid connected between the power station and the power user. It can include a power grid and a transformer, which is used to boost the voltage of the electric energy generated by the power station for transmission, and after being transmitted to the power user, it is stepped down and input to the power user's AC input terminal. The AC input terminal can adopt types such as but not limited to connectors, welding parts, and switch connectors. Exemplarily, the AC input terminal can be a single-phase AC input terminal, that is, the AC input terminal at this time includes a live wire terminal and a neutral wire terminal. Exemplarily, the AC input terminal is used to input a single-phase AC with a voltage of 220V. Exemplarily, the AC input terminal can also be a three-phase AC input terminal, that is, the AC input terminal at this time includes three live wire terminals and a neutral wire terminal. Exemplarily, the three-phase AC input terminal is used to input a three-phase AC with a voltage of 220V.

[0041] When setting up the charging port, refer to Figure 3, the charging port is used to electrically connect to an external vehicle. Any connector that can be electrically connected to the vehicle can be used as the charging port. Exemplarily, the charging port can use a plug-in connector. Exemplarily, the charging port can be a charging gun for charging the vehicle. Exemplarily, the vehicle can be a vehicle such as but not limited to an electric vehicle, a hybrid vehicle, a gas-electric hybrid vehicle, etc. that is provided with a vehicle-mounted battery. Exemplarily, the vehicle-mounted battery can be a power battery or an energy storage battery of the vehicle. Exemplarily, a DC charging port can be provided on the vehicle, that is, the charging gun is used to plug and cooperate with the DC charging port to achieve electrical connection between the charging port and the vehicle. Of course, in other embodiments, the charging port can be electrically connected to the vehicle in other ways.

[0042] When setting up the AC to DC converter, refer to Figures 3 to 10 The AC-DC in the figure represents an AC-DC converter. The AC-DC converter is electrically connected between the AC input terminal and the charging port. The AC-DC converter is used to convert the AC power input from the AC input terminal into DC power and charge the vehicle through the charging port.

[0043] For example, Figure 3 As shown, in the embodiment of the present invention, there is only one level converter between the transformer and the charging port, namely, AC-DC (AC to DC converter). The high-voltage power grid is converted into 380V three-phase AC power by the power frequency transformer, and the AC to DC converter converts the three-phase AC power into DC power for charging the vehicle. One end of the AC to DC converter is connected to the power frequency transformer, and the other end is connected to the charging port.

[0044] In related technologies, such as Figure 1 and Figure 2 As shown, the charging pile of the charging station system adopts two-stage AC-DC and DC-DC converters, which have many converters, high cost and large volume. However, the present application only sets one AC-DC converter between the AC input terminal and the charging port, so that the AC power input from the AC distribution network can be charged through the charging port after the first-level AC-DC conversion, thereby reducing the number of converters, and only one AC-DC converter is needed, which reduces the cost of the charging station system.

[0045] Exemplary, reference Figure 4 and Figure 5 The AC input terminal may include: at least one live wire terminal. The AC to DC converter includes: a DC output terminal and at least one AC to DC branch. The DC output terminal is electrically connected to the charging port. Each AC to DC branch is electrically connected between the corresponding live wire terminal and the DC output terminal, and each AC to DC branch is used to convert the AC power input from the corresponding live wire terminal into DC power and transmit it to the DC output terminal.

[0046] Specifically, refer to Figure 4 When at least one live wire terminal is provided at the AC input terminal, a DC output terminal and at least one AC-to-DC branch are provided in the AC-to-DC converter. The DC output terminal is used to electrically connect to the charging port. The number of AC-to-DC branches is equal to the number of live wire terminals. At least one live wire terminal in the AC input terminal corresponds to at least one AC-to-DC branch in the AC-to-DC converter. Each AC-to-DC branch is electrically connected between the corresponding live wire terminal and the DC output terminal, so that the AC power input from the corresponding live wire terminal is converted into DC power and then transmitted to the DC output terminal, and then transmitted to the charging port through the DC output terminal, thereby realizing charging of the vehicle.

[0047] It should be noted that the number of live wire terminals in the AC input terminal is specifically related to the number of phases of the AC power. Figure 4 When the AC power is single-phase, the number of live wire terminals at the AC input terminal is one. Figure 5 When the alternating current is three-phase alternating current, the number of live wire terminals at the AC input end is three.

[0048] Exemplary, reference Figure 4 The AC-DC branch may include: a first primary bridge arm and a second primary bridge arm connected in parallel, wherein the bridge arm midpoint of the first primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a first inductor, and the bridge arm midpoint of the second primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a second inductor, the positive busbars of the first primary bridge arm and the second primary bridge arm are the first positive busbar, and the negative busbars of the first primary bridge arm and the second primary bridge arm are the second negative busbar; the AC-DC branch also includes: a transformer circuit, the transformer circuit includes a transformer primary side and a transformer secondary side; wherein the positive electrode of the transformer primary side is electrically connected to the live wire end corresponding to the AC-DC branch through a second inductor. The bridge arm midpoint of the first primary bridge arm is connected, and the negative pole of the primary side of the transformer is electrically connected to the bridge arm midpoint of the second primary bridge arm; the AC to DC branch also includes: a first secondary bridge arm and a second secondary bridge arm connected in parallel, wherein the bridge arm midpoint of the first secondary bridge arm is electrically connected to the positive pole of the secondary side of the transformer, and the bridge arm midpoint of the second secondary bridge arm is electrically connected to the negative pole of the secondary side of the transformer; the positive busbars of the first secondary bridge arm and the second secondary bridge arm are the second positive busbars, and the second positive busbars are electrically connected to the positive pole of the DC output terminal; the negative busbars of the first secondary bridge arm and the second secondary bridge arm are the second negative busbars, and the second negative busbars are electrically connected to the negative pole of the DC output terminal. Figure 4 As shown, the first positive busbar and the second positive busbar belong to different positive busbars and are not connected to each other; the first negative busbar and the second negative busbar belong to different negative busbars and are not connected to each other.

[0049] Specifically, refer to Figure 4, each AC-DC branch includes: a primary bridge arm circuit, a transformer circuit and a secondary bridge arm circuit. The primary bridge arm circuit is composed of a first primary bridge arm and a second primary bridge arm, and the first primary bridge arm and the second primary bridge arm are connected in parallel. The primary bridge arm circuit is electrically connected between the live wire end corresponding to the AC-DC branch and the transformer circuit. Specifically, the bridge arm midpoint of the first primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a first inductor, and the bridge arm midpoint of the second primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a second inductor. The positive pole of the primary side of the transformer is electrically connected to the bridge arm midpoint of the first primary bridge arm, and the negative pole of the primary side of the transformer is electrically connected to the bridge arm midpoint of the second primary bridge arm. The positive busbars of the first primary bridge arm and the second primary bridge arm are connected together to form a first positive busbar, and the negative busbars of the first primary bridge arm and the second primary bridge arm are connected together to form a second negative busbar.

[0050] refer to Figure 4 , wherein the secondary bridge arm circuit is electrically connected between the transformer circuit and the DC output terminal. Specifically, the bridge arm midpoint of the first secondary bridge arm is electrically connected to the positive pole of the secondary side of the transformer, and the bridge arm midpoint of the second secondary bridge arm is electrically connected to the negative pole of the secondary side of the transformer; the positive busbars of the first secondary bridge arm and the second secondary bridge arm are connected together to form a second positive busbar, and the second positive busbar is electrically connected to the positive pole of the DC output terminal. The negative busbars of the first secondary bridge arm and the second secondary bridge arm are connected together to form a second negative busbar, and the second negative busbar is electrically connected to the negative pole of the DC output terminal.

[0051] Compared with the AC to DC converter in the related art, Figure 4 The present application omits the bridge arm circuit in the PFC circuit, and adjusts the circuit connection mode of the primary bridge arm circuit, so that the primary bridge arm circuit has both the power factor correction function and the transformer primary bridge arm circuit function. Thus, the number of bridge arms can be reduced.

[0052] Exemplary, reference Figure 4 and Figure 5 The positive electrode of the primary side of the transformer is electrically connected to the midpoint of the bridge arm of the first primary side bridge arm through the third inductor, thereby realizing the filtering function.

[0053] Exemplary, reference Figure 5 , the AC input terminal includes three live wire terminals, that is, the AC input terminal is a three-phase AC input terminal. At this time, the AC to DC converter includes three AC to DC branches. At this time, reference Figure 5 , the first primary bridge arms and the second primary bridge arms in the three AC-DC branches can be connected in parallel between the common first positive bus and the first negative bus, thereby facilitating the parallel connection of the primary bridge arms in the primary bridge arm circuits.

[0054] Exemplary, reference Figure 4 and Figure 5 A capacitor can be electrically connected between the first positive bus and the first negative bus of the first primary bridge arm and the second primary bridge arm in parallel, so as to facilitate the acquisition of the bus voltage of the primary bridge arm circuit and also enable filtering.

[0055] Exemplary, reference Figure 4 and Figure 5 A capacitor may also be electrically connected between the second positive bus and the second negative bus of each secondary bridge arm circuit, thereby facilitating acquisition of the bus voltage of the secondary bridge arm circuit and enabling filtering.

[0056] Exemplary, reference Figure 6 , the charging station system may also include: an energy storage battery cluster and a first DC converter. The first end of the first DC converter is electrically connected to the energy storage battery cluster, the second end of the first DC converter is electrically connected to the charging port in a switchable manner, and the second end of the first DC converter is also electrically connected to the DC output end of the AC-DC converter in a switchable manner. Therefore, when the second end of the first DC converter is connected to the DC output end of the AC-DC converter, the DC power output from the DC output end of the AC-DC converter can be used to charge the energy storage battery cluster after voltage adjustment by the first DC converter. After the second end of the first DC converter is connected to the charging port, the energy storage battery cluster can be discharged to the charging port after voltage adjustment by the first DC converter, thereby realizing the energy storage battery cluster charging the vehicle.

[0057] Exemplary, reference Figure 6 The charging station system may further include: a first switch, such as Figure 6 to Figure 10 K1 in the figure represents a first switch. The first current-passing end of the first switch is electrically connected to the second end of the first DC converter, and the second current-passing end of the first switch is electrically connected to the charging port and the DC output end of the AC-DC converter. Thus, the energy storage battery cluster is electrically connected to the charging port and the DC output end of the AC-DC converter through the first DC converter. Of course, in addition to this, other methods can also be used to achieve an on-off electrical connection between the second end of the first DC converter and the charging port and the DC output end of the AC-DC converter.

[0058] Exemplary, reference Figure 6 The charging station system includes: an energy storage battery cluster, a first DC converter and a first switch. Figure 6 to Figure 10K1 in the figure represents the first switch. The first end of the first DC converter is electrically connected to the energy storage battery cluster; the first current-carrying end of the first switch is electrically connected to the second end of the first DC converter, and the second current-carrying end of the first switch is electrically connected to the charging port and the DC output end of the AC-DC converter. That is, the energy storage battery cluster is electrically connected to the charging port and the DC output end of the AC-DC converter through the first DC converter. The specific way of turning on and off is mainly realized by turning on and off the first switch. Specifically, when the first switch is turned on, the first current-carrying end and the second current-carrying end of the first switch are turned on, so that the second end of the first DC converter is turned on with the charging port and the DC output end. When the first switch is turned off, the first current-carrying end and the second current-carrying end of the first switch are disconnected, so that the second end of the first DC converter is disconnected with the charging port and the DC output end.

[0059] During the application process, refer to Figure 6 When the first switch is turned on, the DC power outputted from the DC output terminal of the AC-DC converter can be used to charge the energy storage battery cluster after voltage adjustment by the first DC converter. Alternatively, the energy storage battery cluster is discharged to the charging port after voltage adjustment by the first DC converter, thereby realizing charging of the vehicle by the energy storage battery cluster.

[0060] refer to Figure 6 It is a structure equipped with an energy storage battery cluster in the charging station system. When the power provided by the AC distribution network does not meet the charging needs of the vehicle, or when the energy storage battery cluster is used to earn the difference in electricity charges by taking advantage of the peak and valley, the charging station system will be equipped with an energy storage battery cluster, and the first DC converter is connected between the AC to DC converter and the charging port. When the AC distribution network charges the energy storage battery cluster, the energy flow is: power grid → transformer → AC to DC converter → first switch K1 → first DC converter → energy storage battery cluster. When the energy storage battery cluster charges the vehicle, the energy flow is: energy storage battery cluster → first DC converter → first switch K1 → charging port → electric vehicle. In the above method, the energy storage battery cluster is connected to the rear end of the above AC to DC converter through the first DC converter, which reduces the power demand of the charging AC-DC, and the AC-DC has low power, low cost and small size. The energy storage battery cluster charges the vehicle and is directly connected to the vehicle through the first-level DC converter, which has low energy consumption, high efficiency and good economy.

[0061] When setting up an energy storage battery cluster, the energy storage battery cluster, as an energy storage device, may be composed of an energy storage module formed by connecting a plurality of battery cells in series and in parallel.

[0062] Exemplary, reference Figure 6 , Figure 7 and Figure 8The number of energy storage battery clusters may be one or more. The number of first DC converters and first switches is specifically related to the number of energy storage battery clusters. Specifically, the number of first DC converters and first switches is specifically equal to the number of energy storage battery clusters. For example, refer to Figure 6 When the number of the energy storage battery cluster is one, the number of the first switch is one, and the number of the first DC converter is also one.

[0063] Exemplary, reference Figure 8 , the number of energy storage battery clusters, the number of first DC converters and the number of first switches are equal and are all at least two. Figure 8 As shown, the number of energy storage battery clusters is n, namely energy storage battery cluster 1, energy storage battery cluster 2, ..., energy storage battery cluster n. The number of first DC converters is n, namely first DC converter 1, first DC converter 2, ..., first DC converter n. The number of first switches is n, namely K11, K12, ..., K1n. Each energy storage battery cluster is electrically connected to the first end of the corresponding first DC converter, the second end of each first DC converter is electrically connected to the first current-passing end of the corresponding first switch, and the second current-passing end of each first switch is electrically connected to the charging port and the DC output end.

[0064] Specifically, refer to Figure 8 , at least two energy storage battery clusters, at least two first DC converters, and at least two first switches, one corresponds to the other, and one energy storage battery cluster corresponds to one first DC converter and one first switch. Each energy storage battery cluster is electrically connected to the first end of the corresponding first DC converter, and the second end of each first DC converter is electrically connected to the first current-passing end of the corresponding first switch. The second current-passing end of each first switch is electrically connected to the charging port and the DC output end. Thus, the corresponding energy storage battery cluster can be controlled to be connected to the DC output end and the charging port through the first switch, so as to realize the charging of each energy storage battery cluster by the DC output end, or the discharging of each energy storage battery cluster to the charging port.

[0065] refer to Figure 8 , an AC-to-DC converter may be provided between the first DC converter and the AC input terminal, or two, three or more AC-to-DC converters may be provided. Exemplarily, the number of the AC-to-DC converters is equal to the number of the first switches, and each AC-to-DC converter has a DC output terminal; the second current-passing terminal of each first switch is electrically connected to the DC output terminal of the corresponding AC-to-DC converter.

[0066] Specifically, refer to Figure 6 and Figure 7 When the number of the first switch, the first DC converter, and the energy storage battery cluster is one, the number of the AC-to-DC converter may be one. Figure 8 When the number of the first switch, the first DC converter, and the energy storage battery cluster is at least two, the number of energy storage battery clusters, the number of the first DC converters, the number of the first switches, and the number of the AC-DC converters can be equal, and all of them are at least two. At least two energy storage battery clusters, at least two first DC converters, at least two first switches, and at least two AC-DC converters correspond to each other, and one energy storage battery cluster corresponds to one first DC converter, one first switch, and one AC-DC converter. Each AC-DC converter has a DC output terminal, and the second current-passing terminal of each first switch is electrically connected to the DC output terminal of the corresponding AC-DC converter. Thus, a corresponding AC-DC converter is set for each energy storage battery cluster, so as to facilitate the adjustment and control of the charging voltage for different energy storage battery clusters.

[0067] Exemplary, reference Figure 7 and Figure 8 The charging station system may further include: a second switch, such as Figure 7-8 K2 in the figure represents a second switch. The first current-carrying end of the second switch is electrically connected to the charging port, and the second current-carrying end of the second switch is electrically connected to at least part of the DC output end and at least part of the second current-carrying end of the first switch. That is, a second switch is also provided for the charging port, and the conduction and disconnection between the charging port and the DC output end or the energy storage battery cluster are controlled by the second switch, so as to realize whether to power off the charging port. Specifically, when the second switch is turned on, the first current-carrying end and the second current-carrying end of the second switch are connected, so as to realize the conduction between the charging port and the DC output end and the energy storage battery cluster, so as to realize the discharge of the charging port. When the second switch is turned off, the first current-carrying end and the second current-carrying end of the second switch are disconnected, so as to realize the disconnection between the charging port and the DC output end and the energy storage battery cluster, so as to realize the disconnection of the charging port.

[0068] For specific connection, refer to Figure 7 , the first current-passing end of the second switch is electrically connected to the charging port, and the second current-passing end of the second switch is electrically connected to at least part of the DC output end and at least part of the second current-passing end of the first switch. Specifically, when the number of the DC output end and the first switch is one, the second current-passing end of the second switch is electrically connected to the DC output end and the second current-passing end of the first switch. Figure 7 It is another structure equipped with an energy storage battery cluster in the charging station system. When the AC distribution network charges the energy storage battery cluster, the second switch K2 is disconnected.

[0069] refer to Figure 8, and when the number of the DC output terminals and the first switches is two or more, the second current-passing end of the second switch is electrically connected to at least part of the DC output terminals and the second current-passing ends of at least part of the first switches. Specifically, the second current-passing end of the second switch can be electrically connected to all the DC output terminals, or to part of the DC output terminals. The second current-passing end of the second switch can be electrically connected to the second current-passing ends of all the first switches, or to part of the second current-passing ends of the first switches.

[0070] Exemplary, reference Figure 7 and Figure 8 The number of charging ports may be one or at least two, so as to support charging of multiple vehicles at the same time. Exemplarily, when the number of charging ports is at least two, each charging port is electrically connected to the first current-passing end of the second switch.

[0071] refer to Figure 8 When the number of charging ports is at least two, when each charging port is electrically connected to the first current-passing end of the second switch, it is specifically related to the number of the second switches. Figure 8 , only one second switch may be provided for at least two charging ports, so that all charging ports are electrically connected to the second current-passing end of the one second switch. In some embodiments, at least two second switches may be provided for at least two charging ports, so that each charging port is only electrically connected to the second current-passing end of some or all of the second switches.

[0072] Exemplarily, when the number of charging ports is at least two, the number of second switches can be equal to the number of charging ports; each charging port is electrically connected to the first current-passing end of the corresponding second switch, and the second current-passing end of each second switch is electrically connected to at least part of the DC output end and at least part of the second current-passing end of the first switch. Specifically, at least two second switches correspond to at least two charging ports one by one, and each charging port is connected and disconnected with the DC output end or the energy storage battery cluster through the corresponding second switch.

[0073] Exemplary, reference Figure 8 The present invention is a structural diagram of a charging station system equipped with multiple charging ports and multiple energy storage battery clusters. Each energy storage battery cluster is connected between each AC to DC converter and the charging port through a first DC converter.

[0074] Exemplary, reference Fig. 9, the charging station system may also include: a photovoltaic component and a second DC converter. The first end of the second DC converter is electrically connected to the photovoltaic component. The second end of the second DC converter is electrically connected to the first end of the first DC converter in an on-off manner, and the second end of the second DC converter is also electrically connected to the energy storage battery cluster in an on-off manner. A photovoltaic component is also provided in the charging station system, and the photovoltaic component is used to generate electricity using sunlight. A second DC converter is also provided for the photovoltaic component, and the second DC converter is electrically connected between the photovoltaic component and the energy storage battery cluster, so that the energy storage battery cluster can be charged after the voltage of the electricity generated by the photovoltaic component is adjusted by the second DC converter. The photovoltaic component and the energy storage battery cluster are electrically connected in an on-off manner, so that the energy storage battery cluster can be protected from overcharging. After the second end of the second DC converter is connected to the first end of the first DC converter, and the first end of the first DC converter is connected to the charging port, the photovoltaic component can also charge the vehicle through the second DC converter and the first DC converter in sequence.

[0075] Exemplary, reference Fig. 9 The charging station system may further include: a third switch, such as Figure 9-10 K3 in the figure represents a third switch. The first current-passing end of the third switch is electrically connected to the second end of the second DC converter, and the second current-passing end of the third switch is electrically connected to the first end of the first DC converter and the energy storage battery cluster. Thus, an on-off electrical connection between the second end of the second DC converter and the first end of the first DC converter and the energy storage battery cluster is achieved. Of course, in addition to this, other methods can also be used to achieve an on-off electrical connection between the second end of the second DC converter and the first end of the first DC converter and the energy storage battery cluster.

[0076] Exemplary, reference Fig. 9 The charging station system includes: a photovoltaic component, a second DC converter and a third switch. The first end of the second DC converter is electrically connected to the photovoltaic component; the first current-passing end of the third switch is electrically connected to the second end of the second DC converter, and the second current-passing end of the third switch is electrically connected to the first end of the first DC converter and the energy storage battery cluster. Specifically, a photovoltaic component is also provided in the charging station system, and the photovoltaic component is used to generate electricity using sunlight. A second DC converter is also provided for the photovoltaic component, and the second DC converter is electrically connected between the photovoltaic component and the energy storage battery cluster, so that the electricity generated by the photovoltaic component can be charged after the voltage is adjusted by the second DC converter. The photovoltaic component and the energy storage battery cluster are electrically connected in a switchable manner through the third switch, so that the energy storage battery cluster can be protected from overcharging.

[0077] For example, Fig. 9It is a structure equipped with photovoltaic modules in the charging station system. In order to develop sustainable energy, the charging station system can also be equipped with photovoltaic modules. The second DC converter is connected to the energy storage battery cluster through the third switch K3. The electric energy generated by the photovoltaic module is adjusted by the voltage of the second DC converter and input into the energy storage battery cluster.

[0078] Exemplary, reference Fig.10 The charging station system may further include: a fourth switch, such as Fig.10 K4 in the figure represents the fourth switch. The first current-passing end of the fourth switch is electrically connected to the second end of the second DC converter, and the second current-passing end of the fourth switch is electrically connected to the charging port. That is, the photovoltaic module and the charging port can also be electrically connected in a switchable manner. Thus, the electricity generated by the photovoltaic module can be directly transmitted to the charging port after voltage adjustment by the second DC converter, so as to realize charging of the vehicle.

[0079] For example, Fig.10 It is another structure equipped with photovoltaic modules in the charging station system. The second DC converter is connected to the energy storage battery cluster through the third switch K3, and is also connected to the charging port through the fourth switch K4. There are two paths for the photovoltaic module to charge the vehicle. One is: photovoltaic module → second DC converter → third switch K3 → first DC converter → second switch K2 → charging port → vehicle. The other is: photovoltaic module → second DC converter → fourth switch K4 → charging port → vehicle. The latter charging path only needs to go through one level of DC-DC, so the energy loss is smaller and the charging efficiency is higher.

[0080] In the various embodiments shown above, only one AC-to-DC converter is provided between the AC input terminal and the charging port, so that the AC power input from the AC distribution network is converted from AC to DC at one level and then the vehicle can be charged through the charging port, thereby reducing the number of converters and reducing the cost of the charging station system.

[0081] Related technologies: Reference Figure 1 and Figure 2 The charging station system uses two-stage AC-DC and DC-DC converters, which are expensive and bulky. The energy storage battery is connected between the above AC-DC and DC-DC through DC-DC. The charging DC-DC has high power, high cost and large size. The energy storage battery needs to go through two DC-DC conversions to charge the electric vehicle, which consumes a lot of energy, has low efficiency and poor economic performance.

[0082] In some embodiments of the present application: the charging pile adopts a first-level AC-DC converter (AC to DC converter), which reduces the cost and size of the converter. The energy storage battery cluster is connected to the rear end of the above-mentioned AC to DC converter through a first DC converter, which reduces the power demand of the charging AC-DC. The AC-DC has low power, low cost and small size. The energy storage battery cluster charges the vehicle and is directly connected to the vehicle through the first-level DC converter, which has low energy consumption, high efficiency and good economy.

[0083] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A charging station system, characterized in that: include: AC input terminal, used for electrically connecting to an external AC distribution network; a charging port for electrically connecting an external vehicle; An AC to DC converter is electrically connected to the AC input terminal and the charging port, and is used to convert the AC power input from the AC input terminal into DC power, and charge the vehicle through the charging port.

2. The charging station system according to claim 1, characterized in that: The AC input terminal includes: at least one live wire terminal; the AC to DC converter includes: a DC output terminal and at least one AC to DC branch; Among them, the DC output end is electrically connected to the charging port; each of the AC-DC branches is electrically connected between the corresponding live wire end and the DC output end, and each of the AC-DC branches is used to convert the AC power input from the corresponding live wire end into DC power and transmit it to the DC output end.

3. The charging station system according to claim 2, characterized in that: The AC-DC branch includes: A first primary bridge arm and a second primary bridge arm connected in parallel, wherein the bridge arm midpoint of the first primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a first inductor, and the bridge arm midpoint of the second primary bridge arm is electrically connected to the live wire end corresponding to the AC-DC branch through a second inductor; the positive busbars of the first primary bridge arm and the second primary bridge arm are the first positive busbar, and the negative busbars of the first primary bridge arm and the second primary bridge arm are the second negative busbar; A transformer circuit, comprising a transformer primary and a transformer secondary; wherein the positive pole of the transformer primary is electrically connected to the midpoint of the bridge arm of the first primary bridge arm, and the negative pole of the transformer primary is electrically connected to the midpoint of the bridge arm of the second primary bridge arm; A first secondary bridge arm and a second secondary bridge arm are connected in parallel, wherein a bridge arm midpoint of the first secondary bridge arm is electrically connected to the positive pole of the secondary side of the transformer, and a bridge arm midpoint of the second secondary bridge arm is electrically connected to the negative pole of the secondary side of the transformer; the positive busbars of the first secondary bridge arm and the second secondary bridge arm are a second positive busbar, and the second positive busbar is electrically connected to the positive pole of the DC output terminal; the negative busbars of the first secondary bridge arm and the second secondary bridge arm are a second negative busbar, and the second negative busbar is electrically connected to the negative pole of the DC output terminal.

4. The charging station system according to claim 3, characterized in that: The positive pole of the primary side of the transformer is electrically connected to the midpoint of the bridge arm of the first primary side bridge arm through a third inductor.

5. The charging station system according to claim 3, characterized in that: The AC input terminal includes three live wire terminals, and the AC-to-DC converter includes three AC-to-DC branches; The first primary bridge arms and the second primary bridge arms in the three AC-DC branches are connected in parallel between the common first positive bus and the first negative bus.

6. The charging station system according to any one of claims 1 to 5, characterized in that: Also includes: Energy storage battery cluster; A first DC converter, wherein a first end of the first DC converter is electrically connected to the energy storage battery cluster, a second end of the first DC converter is electrically connected to the charging port in an on-off manner, and a second end of the first DC converter is also electrically connected to a DC output end of the AC-DC converter in an on-off manner.

7. The charging station system according to claim 6, characterized in that: Also includes: A first switch, wherein a first current-passing end of the first switch is electrically connected to a second end of the first DC converter, and a second current-passing end of the first switch is electrically connected to the charging port and a DC output end of the AC-to-DC converter.

8. The charging station system according to claim 7, characterized in that: The number of the energy storage battery clusters, the number of the first DC converters and the number of the first switches are equal and are all at least two; Each of the energy storage battery clusters is electrically connected to the first end of the corresponding first DC converter, the second end of each of the first DC converters is electrically connected to the first current-passing end of the corresponding first switch, and the second current-passing end of each of the first switches is electrically connected to the charging port and the DC output end.

9. The charging station system according to claim 8, characterized in that: The number of the AC-to-DC converters is equal to the number of the first switches, and each of the AC-to-DC converters has one DC output terminal; The second current-passing end of each first switch is electrically connected to the DC output end of the corresponding AC-to-DC converter.

10. The charging station system according to any one of claims 7 to 9, characterized in that: Also includes: A second switch, wherein a first current-passing end of the second switch is electrically connected to the charging port, and a second current-passing end of the second switch is electrically connected to at least a portion of the DC output end and at least a portion of the second current-passing end of the first switch.

11. The charging station system according to claim 10, characterized in that: The number of the charging ports is at least two, and each of the charging ports is electrically connected to the first current-passing end of the second switch.

12. The charging station system according to claim 11, characterized in that: The number of the second switches is equal to the number of the charging ports; Each of the charging ports is electrically connected to a corresponding first current-passing end of the second switch, and a second current-passing end of each of the second switches is electrically connected to at least a portion of the DC output end and at least a portion of the second current-passing end of the first switch.

13. The charging station system according to any one of claims 7 to 9, characterized in that: Also includes: Photovoltaic panels; A second DC converter, wherein a first end of the second DC converter is electrically connected to the photovoltaic assembly, a second end of the second DC converter is electrically connected to the first end of the first DC converter in an on-off manner, and a second end of the second DC converter is also electrically connected to the energy storage battery cluster in an on-off manner.

14. The charging station system according to claim 13, characterized in that: Also includes: A third switch, wherein a first current-passing end of the third switch is electrically connected to a second end of the second DC converter, and a second current-passing end of the third switch is electrically connected to a first end of the first DC converter and the energy storage battery cluster.

15. The charging station system according to claim 13, characterized in that: Also includes: A fourth switch, wherein a first current-passing end of the fourth switch is electrically connected to the second end of the second DC converter, and a second current-passing end of the fourth switch is electrically connected to the charging port.

16. The charging station system according to claim 1, characterized in that: The charging port is a charging gun used to charge the vehicle.

Images