Battery charging device

Abstract

A battery charging apparatus includes: a charge / discharge port; a power factor correction circuit having first to third inductors; a first relay; an interleaving relay; and a controller configured to control a connection or disconnection state of the first relay and a connection or disconnection state of the interleaving relay such that the battery charging apparatus is configured to transmit external power to the battery through the charge / discharge port or transmit battery power of the battery to an external power source through the charge / discharge port.

Description

Technical Field

[0001] The present disclosure relates to a battery charging device. Background Art

[0002] In recent years, in accordance with the global trend of reducing carbon dioxide emissions, there is a growing demand for electric vehicles that generate driving force for traveling by driving an electric motor using electric energy stored in an energy storage device such as a battery, instead of typical vehicles equipped with an internal combustion engine that generate driving force for traveling by burning fossil fuels.

[0003] Electric vehicles may be equipped with an on-board charger (OBC) that uses the power system to charge the battery. Typically, the OBC is configured with a power factor correction circuit (PFC) that converts the external AC voltage into a DC voltage and a DC / DC converter that adjusts the DC voltage generated by the conversion to the voltage required by the battery.

[0004] In recent years, as the capacity of batteries provided in electric vehicles has increased, vehicle-to-grid (V2G) and vehicle-to-load (V2L) technologies for supplying energy stored in batteries to systems and electric loads through OBCs have been developed.

[0005] The above content is only intended to help understanding the background of the present disclosure, and is not intended to mean that the present disclosure falls within the scope of the prior art known to those skilled in the art. Summary of the invention

[0006] The present disclosure relates to a battery charging device capable of providing an isolation function by using a relay. An embodiment of the present disclosure is a battery charging device capable of enabling a plurality of relays to share an isolation function, ensuring an improvement in isolation performance and a reduction in manufacturing cost.

[0007] The present disclosure is not limited to the above advantages. Advantages not mentioned will be clearly understood by those skilled in the art from the following description.

[0008] In order to achieve the above advantages, according to an embodiment of the present disclosure, the battery charging device includes a charge and discharge port having a first charge and discharge AC terminal to a third charge and discharge AC terminal and a neutral terminal, wherein the external power is transmitted to the battery through the charge and discharge port or the power of the battery is transmitted to the external power source through the charge and discharge port. In an embodiment, the battery charging device further includes a power factor correction circuit, which has a first inductor to a third inductor corresponding to the first charge and discharge AC terminal to the third charge and discharge AC terminal, respectively. In an embodiment, the battery charging device further includes a first relay electrically connected between the first charge and discharge AC terminal and the first inductor. In an embodiment, the battery charging device further includes an interleaved relay, one end of the interleaved relay is electrically connected between the first charge and discharge AC terminal and the first relay, and the other end of the interleaved relay is electrically connected between the second charge and discharge AC terminal and the second inductor. And in an embodiment, the battery charging device further includes: a controller configured to control the connection or disconnection state of the first relay and the connection or disconnection state of the interleaved relay.

[0009] In the battery charging apparatus, the first relay and the interleaved relay may have respective current capacities equal to each other.

[0010] In the battery charging device, single-phase AC power may be input to the first charging and discharging AC terminal.

[0011] In the battery charging apparatus, three phases of alternating current respectively corresponding to the three-phase alternating current may be input to the first to third charge and discharge AC terminals, respectively.

[0012] In the battery charging apparatus, the second relay, the third relay, and the neutral terminal relay may be connected to the second charge and discharge AC terminal, the third charge and discharge AC terminal, and the neutral terminal, respectively.

[0013] In the battery charging device, the controller may connect the first relay and the interleaving relay to transmit power of the battery to the external power source through the charge and discharge port.

[0014] The battery charging apparatus may further include a pre-charging relay connected in series to the pre-charging resistor between one end of the first relay and the other end of the first relay.

[0015] In the battery charging apparatus, the pre-charging relay may have a lower current capacity than the first relay.

[0016] In the battery charging device, when AC power starts to be input to the first charge and discharge AC terminal, the controller may control the pre-charge relay in a connected manner.

[0017] In the battery charging apparatus, the controller may turn off the pre-charging relay when the voltage applied to the first inductor falls within a preset range.

[0018] The battery charging device may further include a discharge port having a first discharge AC terminal and a second discharge AC terminal, and the power of the battery is transmitted to an external power source through the discharge port.

[0019] In the battery charging apparatus, one end of the discharge port may be electrically connected between the interleaving relay and the second inductor, and the other end thereof may be electrically connected between the third charge and discharge AC terminal and the third inductor.

[0020] The battery charging device may further include a discharge relay electrically connected between the first discharge AC terminal and the second discharge AC terminal.

[0021] In a battery charging device, the controller may connect the discharge relay to transfer power from the battery through the discharge port.

[0022] In the battery charging apparatus, the controller may selectively connect or disconnect the first relay, the interleaving relay, and the discharge relay with respect to a discharge mode of the battery.

[0023] In the battery charging apparatus, when the discharge mode of the battery is a first battery discharge mode for transmitting power of the battery to an external power source through the charge and discharge port, the controller may connect the first relay and the interleaving relay and disconnect the discharge relay.

[0024] In the battery charging apparatus, when the discharge mode of the battery is a second battery discharge mode for transmitting power of the battery to an external power source through the discharge port, the controller may connect the discharge relay and disconnect the first relay and the interleaving relay.

[0025] In the battery charging apparatus, when the discharge mode of the battery is a simultaneous driving mode for transmitting power of the battery to an external power source through the charge and discharge ports and the discharge port, the controller may connect the first relay, the interleaving relay, and the discharge relay.

[0026] In an embodiment of the present disclosure, multiple relays can share the isolation function of isolating power from an external power source. This can reduce the current capacity required for each relay, thereby achieving a reduction in size and manufacturing cost.

[0027] In addition, in an embodiment, isolation between different discharge ports can be performed by providing a plurality of relays for isolating power from an external power source. This can eliminate the need for a separate relay for isolation between discharge ports, thereby also achieving a reduction in manufacturing costs.

[0028] The present disclosure is not necessarily limited to the above-mentioned effects. Unmentioned effects will be clearly understood by those of ordinary skill in the art to which the present disclosure pertains from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0030] Figure 1 is a diagram showing a circuit in a battery charging device according to an embodiment of the present disclosure;

[0031] Figure 2 is a block diagram for describing the flow of current through a first relay, an interleaving relay, and a pre-charging relay according to an embodiment of the present disclosure; and

[0032] Figure 3 is a block diagram for describing control in a battery charging mode according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] The embodiments of the present disclosure disclosed in this specification are provided only for the purpose of describing the present disclosure in terms of specific embodiments of structure or function. The embodiments of the present disclosure can be implemented in various forms, and the present disclosure should not be interpreted as necessarily being limited to the embodiments described in this specification.

[0034] Various modifications may be made to the embodiments of the present disclosure, and therefore, the embodiments of the present disclosure or embodiments based on the present disclosure may have various forms. Therefore, the embodiments are specifically shown in the drawings and described in detail in this specification. However, the present disclosure is not intended to be limited to the embodiments specifically shown in the drawings, and all modifications, equivalents, and replacements included in the technical concept of the present disclosure should be understood to also fall within the scope of the present disclosure.

[0035] Unless otherwise defined, each of all terms (including technical or scientific terms) used throughout this specification may have the same meaning as commonly understood by a person of ordinary skill in the art to which the present disclosure belongs. Terms as defined in commonly used dictionaries may be interpreted as having the same contextual meaning as terms used in the relevant technical field, and unless otherwise clearly defined in this specification, should not be interpreted as having an overly suggestive meaning or a purely literal meaning.

[0036] For the purpose of the present disclosure, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The same or similar constituent elements are given the same reference numerals, and their description may not be repeated.

[0037] Throughout this specification, when the term "preset" is placed before a parameter associated with a process or algorithm, the preset parameter may mean that the value of the parameter is predetermined or selected. The value of the parameter may be set at the beginning of execution or implementation of the process or algorithm according to an embodiment of the present disclosure, or may be set when the process or algorithm is executed or implemented.

[0038] The terms “module” and “unit” may hereinafter be used interchangeably or individually to refer to constituent elements merely for convenience of description in this specification, and thus are not necessarily intended to take different meanings or describe different functions by themselves.

[0039] When describing the embodiments of the present disclosure, when it is determined that the nature and key points of the present disclosure are obscure, a detailed description of the known technologies related thereto may be omitted. In addition, the accompanying drawings are only used to help easily understand the embodiments disclosed in this specification. It should be understood that the technical concepts disclosed in this specification are not necessarily limited by the accompanying drawings, and any changes, any equivalents, and any substitutes of the constituent elements according to the present disclosure that fall within the scope of the technical concepts of the present disclosure may also be included in the scope of the present disclosure.

[0040] The terms "first", "second", etc. may be used to describe various components having the same function, but do not impose any limitation on the meanings of the various components. These terms are only used to distinguish various components having the same function.

[0041] It should be understood that when it is referred to as being "coupled to" or "connected to" different component elements, the component elements may also be directly coupled to or directly connected to the different component elements, or may also be coupled to or connected to different component elements with one or more component elements in between. Similarly, it should be understood that when it is referred to as being "directly coupled to" or "directly connected to" different component elements, the component elements may be coupled to or connected to different component elements without a third component element in between.

[0042] A noun in the singular has the same meaning as when used in the plural form, unless the noun has a different meaning in context.

[0043] The terms "including", "having" and the like in this application are intended to indicate the presence of the features, quantities, steps, operations, constituent elements, parts or combinations thereof described in the specification, and therefore should be understood as not excluding the possibility that one or more other features, quantities, steps, operations, constituent elements, parts or combinations thereof may exist or be added.

[0044] The controller may include: a communication device that communicates with another controller or a sensor to control the functions for which the controller is responsible; a memory in which an operating system, logic commands, input and output information, etc. are stored; and one or more processors that perform judgments, calculations, determinations, etc. that may be necessary to control the functions for which the controller is responsible.

[0045] The battery charging device according to the embodiment of the present disclosure can make multiple relays share the isolation function of isolating the system power from the battery. Therefore, the burden of the power applied to each of the multiple relays can be reduced, thereby ensuring that each of the multiple relays effectively performs the isolation function. Therefore, it is proposed that the current capacity required for each relay can be reduced to achieve a reduction in size and manufacturing cost, and the battery charging device can effectively perform the isolation function.

[0046] The following will refer to Figures 1 to 3 A battery charging device according to an embodiment of the present disclosure is described.

[0047] Figure 1 is a diagram showing a circuit in a battery charging device according to an embodiment of the present disclosure. Figure 2 is a block diagram for describing the flow of current through a first relay, an interleaving relay, and a pre-charging relay according to an embodiment of the present disclosure. Figure 3 is a block diagram for describing control in a battery charging mode according to an embodiment of the present disclosure.

[0048] First, refer to Figure 1 , the battery charging device may include a bidirectional charger 1 and a controller 2. Figure 1 The constituent elements associated with the embodiments of the present disclosure are shown in a focused manner. Of course, the battery charging device of the embodiment may be configured to further include one or more constituent elements or to omit one or more existing constituent elements.

[0049] First, the bidirectional charger 1 may include a charge and discharge port 10, a discharge port 20, an input circuit 100, and a power factor correction circuit (PFC) 200. The bidirectional charger 1 may further include an output terminal (not shown) configured to be connected to a battery and a DC / DC converter (not shown).

[0050] The charge and discharge port 10 may include a first charge and discharge AC terminal L1, a second charge and discharge AC terminal L2, a third charge and discharge AC terminal L3 and a neutral terminal N. The charge and discharge port 10 may support a battery charging mode for transmitting external power to a battery and a battery discharge mode for transmitting power from a battery to an external power source (external source). In this case, the charge and discharge port 10 may be disposed outside the electric vehicle, but is not necessarily limited to this location. According to an embodiment of the present embodiment, the battery discharge mode may refer to a vehicle load (V2L) mode for transmitting power from a battery to an external power source.

[0051] In an embodiment, the battery charging mode may include a first battery charging mode for applying three-phase AC power to the charge and discharge port 10 and a second battery charging mode for applying single-phase AC power to the charge and discharge port 10 .

[0052] In the second battery charging mode, single-phase AC power may be input into the first charge and discharge AC terminal L1. In the first battery charging mode, AC power of three phases respectively corresponding to the three-phase AC power may be input into the first to third charge and discharge AC terminals L1 to L3, respectively.

[0053] The battery discharge mode will be described below.

[0054] The discharge port 20 may include a first discharge AC terminal I1 and a second discharge AC terminal I2 and may support a battery discharge mode for transmitting power of the battery to an external power source. In this case, the discharge port 20 may be disposed inside the electric vehicle, but is not necessarily limited to this location.

[0055] In an embodiment, if Figure 1 As shown, one end of the discharge port 20 is electrically connected between the interleaving relay RLY_L1_L2 and the second inductor Lg2, and the other end thereof can be electrically connected between the third charge and discharge AC terminal L3 and the third inductor Lg3.

[0056] In an embodiment in which only the charge and discharge port 10 is provided to the bidirectional charger 1, the power of the battery may be transmitted only through the charge and discharge port 10. However, in an embodiment in which the charge and discharge port 10 is provided to the bidirectional charger 1 together with the discharge port 20, the power of the battery may be transmitted to the external power source only through the discharge port 20, or through both the discharge port 20 and the charge and discharge port 10.

[0057] like Figure 1As shown, the discharge relay RLY_V2L may be electrically connected between the first discharge AC terminal I1 and the second discharge AC terminal I2 of the discharge port 20. In this case, when the discharge relay RLY_V2L is connected therebetween, the power of the battery may be transmitted through the discharge port 20. In addition, when the discharge relay RLY_V2L is disconnected, the power of the battery cannot be transmitted to the external power source through the discharge port 20.

[0058] like Figure 1 As shown, the input circuit 100 may include an electromagnetic interference (EMI) filter, a pre-charge relay RLY_PC, a first relay RLY_L1, an interleave relay RLY_L1_L2, a second relay RLY_L2, a third relay RLY_L3, and a neutral terminal relay RLY_N_A.

[0059] The first relay RLY_L1 may be electrically connected between the first charge and discharge AC terminal L1 and the first inductor Lg1 .

[0060] like Figure 1 As shown, one end of the interleaved relay RLY_L1_L2 can be electrically connected between the first charge and discharge AC terminal L1 and the first relay RLY_L1, and the other end thereof can be electrically connected between the second charge and discharge AC terminal L2 and the second inductor Lg2.

[0061] In this case, when the first relay RLY_L1 and the interleaved relay RLY_L1_L2 are turned on to establish a connection respectively, the external power input into the first charge and discharge AC terminal L1 can be distributed to each of the first relay RLY_L1 and the interleaved relay RLY_L1_L2, or the power of the battery can be transmitted to the external power supply. In addition, when the first relay RLY_L1 and the interleaved relay RLY_L1_L2 are turned off to establish a disconnection respectively, the battery is isolated from the external power supply. Therefore, the power of the battery cannot be transmitted to the external power supply, or the external power cannot be transmitted to the battery.

[0062] In the case where the first relay RLY_L1 is arranged to be more toward the first charge and discharge AC terminal L1 than the interleaved relay RLY_L1_L2, the first relay RLY_L1 must be responsible for the entire current flowing through the first charge and discharge AC terminal L1. As a result, the first relay RLY_L1 requires a relatively high current capacity. However, the external power input into the first charge and discharge AC terminal is distributed to the first relay RLY_L1 and the interleaved relay RLY_L1_L2. Therefore, a relay with a relatively low current capacity can also be used as the first relay RLY_L1.

[0063] The current flowing through the first relay RLY_L1 and the interleaved relay RLY_L1_L2 may be input into the first inductor Lg1 and the second inductor Lg2, respectively. The currents input into the first inductor Lg1 and the second inductor Lg2 may be the same or equal to each other.

[0064] Therefore, in an embodiment, the first relay RLY_L1 and the interleaving relay RLY_L1_L2 may have respective current capacities equal to each other. The same or equal currents may flow to the first relay RLY_L1 and the interleaving relay RLY_L1_L2. For example, the first relay RLY_L1 and the interleaving relay RLY_L1_L2 may each have a current capacity of 16A.

[0065] like Figure 1 As shown, the pre-charging relay RLY_PC may be connected in series to the pre-charging resistor R_PC between one end of the first relay RLY_L1 and the other end of the first relay RLY_L1 .

[0066] The pre-charging relay RLY_PC can be connected when the AC power starts to be input to the first charge and discharge AC terminal L1, and can be disconnected when the AC power is input to the first charge and discharge AC terminal L1 and then the voltage applied to the first inductor Lg1 falls within a preset range. For example, the pre-charging relay RLY_PC can be disconnected after the voltage applied to the first inductor Lg1 reaches a peak value.

[0067] When the pre-charging relay RLY_PC is connected, the current flowing through the first charging and discharging AC terminal L1 can be distributed to the first relay RLY_L1, the interleaving relay RLY_L1_L2 and the pre-charging resistor R_PC. When the pre-charging relay RLY_PC is disconnected, the current flowing through the first charging and discharging AC terminal L1 can be distributed only to the first relay RLY_L1 and the interleaving relay RLY_L1_L2.

[0068] When the pre-charge relay RLY_PC is connected, a pre-charge operation for stabilizing the voltage through the pre-charge resistor R_PC is performed. Only when a low load operation (referred to as a pre-charge operation) is performed, current flows through the pre-charge relay RLY_PC. Therefore, the pre-charge relay RLY_PC may have a lower current capacity than the first relay RLY_L1. In addition, the pre-charge relay RLY_PC may also have a lower current capacity than the interleaved relays RLY_L1_L2. Figure 2 Describes the current capacity.

[0069] Figure 2is a diagram for describing current flow through the first relay ( RLY_L1 ), the interleaving relay ( RLY_L1_L2 ), and the pre-charge relay ( RLY_PC ) according to an embodiment of the present disclosure.

[0070] refer to Figure 2 , for example, when the first relay RLY_L1 and the interleaving relay RLY_L1_L2 have a current capacity of 16A, the pre-charging relay RLY_PC may have a current capacity of 10A or less.

[0071] Return to reference Figure 1 , when AC power starts to be input through the first charge and discharge AC terminal L1, in the initial stage, the first relay RLY_L1, the pre-charge relay RLY_PC, and the interleaved relay RLY_L1_L2 may all be in a connected state to perform a pre-charge operation. At this time, a portion of the current flowing through the first charge and discharge AC terminal L1 may be allocated to the interleaved relay RLY_L1_L2, and the remaining portion thereof may be allocated to the first relay RLY_L1 and the pre-charge relay RLY_PC. The current distribution between the first relay RLY_L1 and the pre-charge relay RLY_PC may be determined according to the size of the pre-charge resistor R_PC.

[0072] In the case where the pre-charging operation is no longer performed, the pre-charging relay RLY_PC is disconnected. Therefore, a portion of the current flowing through the first charge and discharge AC terminal L1 can be allocated to the interleaved relay RLY_L1_L2, and the remaining portion thereof can be allocated to the first relay RLY_L1. At this time, the current flowing through the first relay RLY_L1 or the pre-charging relay RLY_PC has a phase corresponding to the first charge and discharge AC terminal L1 and can be transmitted to the first inductor Lg1. In addition, the current flowing through the second relay RLY_L2 has a phase corresponding to the second charge and discharge AC terminal L2 and can be transmitted to the second inductor Lg2.

[0073] Still refer to Figure 1 The second relay RLY_L2 can be connected between the second charge and discharge AC terminal L2 of the charge and discharge port 10 and the second inductor Lg2 of the power factor correction circuit 200.

[0074] The third relay RLY_L3 may be connected between the third charge and discharge AC terminal L3 of the charge and discharge port 10 and the third inductor Lg3 of the power factor correction circuit 200 .

[0075] The neutral terminal relay RLY_N_A may be connected between the neutral terminal N of the charge and discharge port 10 and the third inductor Lg3 of the power factor correction circuit 200 .

[0076] In an embodiment, if Figure 1 As shown, the power factor correction circuit 200 may include a first inductor Lg1, a second inductor Lg2, and a third inductor Lg3 corresponding to the first charge and discharge AC terminal L1, the second charge and discharge AC terminal L2, and the third charge and discharge AC terminal L3, respectively. The power factor correction circuit 200 may further include: a first branch (leg) L11, a second branch L12, a third branch L13, and a DC capacitor C1.

[0077] Still refer to Figure 1 , the DC capacitor C1 may be connected between the first DC terminal D1 and the second DC terminal D2.

[0078] The first branch L11 may include two switching elements connected in series to each other between the first DC terminal D1 and the second DC terminal D2 , and may have an AC terminal connected to the first AC terminal A1 of the power factor correction circuit 200 through the first inductor Lg1 .

[0079] The second branch L12 includes two switching elements connected in series to each other between the first DC terminal D1 and the second DC terminal D2, and the second branch L12 may have an AC terminal connected to the second AC terminal A2 of the power factor correction circuit 200 through the second inductor Lg2.

[0080] The third branch L13 may include two switching elements connected in series to each other between the first DC terminal D1 and the second DC terminal D2, and may have an AC terminal connected to the third AC terminal A3 of the power factor correction circuit 200 through the third inductor Lg3. In this case, a neutral terminal relay connected in series to the third inductor Lg3 may be provided together.

[0081] Although not in Figure 1 As shown in FIG. 1 , the bidirectional charger 1 according to an embodiment of the present disclosure may further include a DC / DC converter. The DC / DC converter may be connected between the DC terminal D1 or D2 of the power factor correction circuit 200 and the output terminal to which the battery is connected and may convert a DC voltage between the DC terminal D1 or D2 and the output terminal.

[0082] For example, the DC / DC converter of the embodiment may include a first switching circuit, a second switching circuit, a transformer, and a DC capacitor. In this case, the transformer may be connected between the first switching circuit and the second switching circuit, and the DC capacitor may be connected between the positive (+) electrode of the battery and the negative (-) electrode of the battery.

[0083] The controller 2 can connect or disconnect the first relay RLY_L1, the interleaving relay RLY_L1_L2, the pre-charge relay RLY_PC, the discharge relay RLY_V2L, and the like.

[0084] Through the connecting and disconnecting operations, the controller 2 can control the bidirectional charger 1 so that it performs a battery charging mode for charging the battery with external DC power and a battery discharging mode for discharging power of the battery to the charging and discharging port 10 and / or the discharging port 20 .

[0085] In this case, for an embodiment, the battery charging mode may include a first battery charging mode for applying three-phase AC power to the charge and discharge port 10 and a second battery charging mode for applying single-phase AC power to the charge and discharge port 10 .

[0086] When executing the first battery charging mode, the controller 2 can connect the first relay RLY_L1, the second relay RLY_L2 and the third relay RLY_L3 to establish connections respectively, and can open the first branch L11, the second branch L12 and the third branch L13 of the power factor correction circuit 200, so that the bidirectional charger 1 charges the battery with three-phase AC power.

[0087] When the second battery charging mode is executed, single-phase AC power may be input to the first charging and discharging AC terminal L1 of the charging and discharging port 10. In addition, the controller 2 may respectively turn on the first relay RLY_L1, the interleaving relay RLY_L1_L2, and the neutral terminal relay RLY_N_A to obtain a connection state, and may turn on the first branch L11, the second branch L12, and the third branch L13 of the power factor correction circuit 200, so that the bidirectional charger 1 charges the battery using single-phase AC power.

[0088] In an embodiment, the battery discharge mode may include: a first battery discharge mode for outputting the power of the battery through the charge and discharge port 10; and a second battery discharge mode for outputting the power of the battery through the discharge port 20. Figure 3 Control of a battery discharge mode according to an embodiment of the present disclosure is described.

[0089] Figure 3 is a diagram for describing control in a battery discharge mode according to an embodiment of the present disclosure.

[0090] refer to Figure 1 and Figure 3 When executing the first battery discharge mode, the controller 2 can respectively turn on the first relay RLY_L1, the interleaved relay RLY_L1_L2 and the neutral terminal relay RLY_N_A to obtain a connection state. In addition, the controller 2 can turn on the first branch L11 and the third branch L13 of the power factor correction circuit 200, so that the bidirectional charger 1 outputs battery power through the charge and discharge port 10.

[0091] In this case (the first battery discharging mode), the controller 2 may turn off the discharging relay RLY_V2L so that the bidirectional charger 1 does not output the power of the battery through the discharging port 20 .

[0092] When the second battery discharge mode is executed, the controller 2 may turn on the discharge relay RLY_V2L to establish a connection and may turn on the second branch L12 and the third branch L13 of the power factor correction circuit 200, so that the bidirectional charger 1 outputs the power of the battery through the discharge port 20. In this case (the second battery discharge mode), the controller 2 may disconnect the first relay RLY_L1, the interleaved relay RLY_L1_L2, and the neutral terminal relay RLY_N_A, so that the bidirectional charger 1 does not output the power of the battery through the charge and discharge port 10.

[0093] In addition, the controller 2 can execute a simultaneous driving mode (i.e., can execute a first battery discharge mode and a second battery discharge mode simultaneously), in which the bidirectional charger 1 outputs the power of the battery through the charge and discharge port 10 and the discharge port 20. When executing the simultaneous driving mode, the controller 2 can respectively turn on the first relay RLY_L1, the staggered relay RLY_L1_L2, the neutral terminal relay RLY_N_A, and the discharge relay RLY_V2L to establish a connection.

[0094] According to the above-mentioned embodiment of the present disclosure, a plurality of relays can share the isolation function of isolating electric power from an external power supply, thereby reducing the current capacity required for each relay, achieving miniaturization and reduction in manufacturing cost.

[0095] In addition, isolation between different discharge ports can be performed by a plurality of relays provided to isolate power from an external power source. This can eliminate the need for separate relays for isolation between discharge ports, thereby also achieving a reduction in manufacturing costs.

[0096] The specific embodiments of the present disclosure are described above with reference to the accompanying drawings. However, it is obvious to those skilled in the art that various modifications and changes can be made to the embodiments of the present disclosure without departing from the technical concept of the present disclosure claimed in the appended claims.

Claims

1. A battery charging device, comprising: a charge and discharge port, comprising first to third charge and discharge AC terminals and a neutral terminal, wherein the battery charging device is configured to transmit external power to the battery through the charge and discharge port or to transmit the battery power of the battery to an external power source through the charge and discharge port; A power factor correction circuit, comprising a first inductor to a third inductor corresponding to the first charge and discharge AC terminal to the third charge and discharge AC terminal respectively; a first relay electrically coupled between the first charge and discharge AC terminal and the first inductor; an interleaved relay, one terminal of the interleaved relay being electrically coupled between the first charge and discharge AC terminal and the first relay, and another terminal of the interleaved relay being electrically coupled between the second charge and discharge AC terminal and the second inductor; as well as A controller is configured to control a connection or disconnection state of the first relay and a connection or disconnection state of the interleaving relay.

2. The device according to claim 1, wherein The first relay and the interleaved relay have respective current capacities equal to each other.

3. The device according to claim 1, wherein: The battery charging device is configured to input single-phase AC power to the first charging and discharging AC terminal.

4. The device according to claim 1, wherein: The battery charging device is configured to input AC power of three phases respectively corresponding to three-phase AC power to the first to third charge and discharge AC terminals, respectively.

5. The apparatus according to claim 1, further comprising: a second relay electrically coupled to the second charge and discharge AC terminal; a third relay electrically coupled to the third charge and discharge AC terminal; as well as A neutral terminal relay is electrically coupled to the neutral terminal.

6. The device according to claim 1, wherein: The controller is further configured to connect the first relay and connect the interleaving relay so as to transmit the battery power of the battery to the external power source through the charge and discharge port.

7. The apparatus according to claim 1, further comprising: Pre-charge relay; as well as A pre-charge resistor, wherein the pre-charge relay is electrically coupled to the pre-charge resistor in series between one terminal of the first relay and another terminal of the first relay.

8. The device according to claim 7, wherein: The pre-charging relay has a lower current capacity than the first relay.

9. The device according to claim 7, wherein: The controller is configured to connect the pre-charging relay in response to starting input of AC power to the first charging and discharging AC terminal.

10. The device according to claim 7, wherein: The controller is configured to open the pre-charging relay in response to a voltage applied to the first inductor falling within a preset range.

11. The apparatus according to claim 1, further comprising: A discharge port includes a first discharge AC terminal and a second discharge AC terminal, wherein the battery charging device is further configured to transmit battery power of the battery to the external power source through the discharge port.

12. The device according to claim 11, wherein The second discharge AC terminal of the discharge port is electrically coupled between the interleaved relay and the second inductor, and wherein the first discharge AC terminal of the discharge port is electrically coupled between the third charge and discharge AC terminal and the third inductor.

13. The apparatus according to claim 12, further comprising: A discharge relay is electrically coupled between the first discharge AC terminal and the second discharge AC terminal.

14. The device according to claim 13, wherein: The controller is configured to connect the discharge relay to transfer battery power of the battery through the discharge port.

15. The apparatus according to claim 13, wherein: The controller is configured to selectively connect or disconnect the first relay, the interleaving relay, and the discharge relay in response to a discharge mode of the battery.

16. The device according to claim 15, wherein: The discharge mode of the battery includes a first battery discharge mode for transmitting the battery power of the battery to the external power source through the charge and discharge port, and The controller is configured to connect the first relay, connect the interleaving relay, and disconnect the discharge relay in response to the first battery discharge mode.

17. The apparatus according to claim 15, wherein: The discharge mode of the battery includes a second battery discharge mode for transmitting battery power of the battery to the external power source through the discharge port, and The controller is configured to connect the discharge relay, disconnect the first relay, and disconnect the interleaving relay in response to the second battery discharge mode.

18. The apparatus according to claim 15, wherein: The discharge mode of the battery includes a simultaneous driving mode for transmitting battery power of the battery to the external power source through the charge and discharge port and through the discharge port, and Wherein, the controller is configured to connect the first relay, connect the interleaving relay, and connect the discharge relay in response to the simultaneous driving mode.

19. A battery charging device comprising: a charge and discharge port, comprising first to third charge and discharge AC terminals and a neutral terminal, wherein the battery charging device is configured to transmit external power to the battery through the charge and discharge port or to transmit the battery power of the battery to an external power source through the charge and discharge port; A power factor correction circuit, comprising a first inductor to a third inductor corresponding to the first charge and discharge AC terminal to the third charge and discharge AC terminal respectively; a first relay electrically coupled between the first charge and discharge AC terminal and the first inductor; an interleaved relay, one terminal of the interleaved relay being electrically coupled between the first charge and discharge AC terminal and the first relay, and another terminal of the interleaved relay being electrically coupled between the second charge and discharge AC terminal and the second inductor; a discharge port, the discharge port comprising a first discharge AC terminal and a second discharge AC terminal, wherein the battery charging device is further configured to transmit the battery power of the battery to the external power source through the discharge port, The first discharge AC terminal of the discharge port is electrically coupled between the third charge and discharge AC terminal and the third inductor, and wherein the second discharge AC terminal of the discharge port is electrically coupled between the interleaved relay and the second inductor; a discharge relay electrically coupled between the first discharge AC terminal and the second discharge AC terminal; and a controller configured to control a connection or disconnection state of the first relay and a connection or disconnection state of the interleaving relay, wherein the controller is further configured to connect the discharge relay to transmit battery power of the battery through the discharge port, wherein the controller is further configured to selectively connect or disconnect the first relay, the interleaving relay, and the discharge relay in response to a discharge mode of the battery, The discharge mode of the battery includes a first battery discharge mode for transmitting the battery power of the battery to the external power source through the charge and discharge port, wherein the controller is further configured to connect the first relay, connect the interleaving relay, and disconnect the discharge relay in response to the first battery discharge mode, wherein the discharge mode of the battery includes a second battery discharge mode for transmitting battery power of the battery to the external power source through the discharge port, wherein the controller is further configured to connect the discharge relay, disconnect the first relay, and disconnect the interleaving relay in response to the second battery discharge mode, wherein the discharge mode of the battery further includes a simultaneous drive mode for transmitting the battery power of the battery to the external power source through the charge and discharge port and through the discharge port, and Wherein, the controller is further configured to connect the first relay, connect the interleaving relay, and connect the discharge relay in response to the simultaneous driving mode.

20. A battery charging device comprising: a charge and discharge port, comprising first to third charge and discharge AC terminals and a neutral terminal, wherein the battery charging device is configured to transmit external power to the battery through the charge and discharge port or to transmit the battery power of the battery to an external power source through the charge and discharge port; A power factor correction circuit, comprising a first inductor to a third inductor corresponding to the first charge and discharge AC terminal to the third charge and discharge AC terminal respectively; a first relay electrically coupled between the first charge and discharge AC terminal and the first inductor; a second relay electrically coupled to the second charge and discharge AC terminal; a third relay electrically coupled to the third charge and discharge AC terminal; a neutral terminal relay, electrically connected to the neutral terminal; Pre-charge relay; a pre-charge resistor, wherein the pre-charge relay is electrically coupled to the pre-charge resistor in series between one terminal of the first relay and another terminal of the first relay; an interleaved relay, one terminal of the interleaved relay being electrically coupled between the first charge and discharge AC terminal and the first relay, and another terminal of the interleaved relay being electrically coupled between the second charge and discharge AC terminal and the second inductor; a discharge port, the discharge port comprising a first discharge AC terminal and a second discharge AC terminal, wherein the battery charging device is further configured to transmit the battery power of the battery to the external power source through the discharge port, The first discharge AC terminal of the discharge port is electrically coupled between the third charge and discharge AC terminal and the third inductor, and wherein the second discharge AC terminal of the discharge port is electrically coupled between the interleaved relay and the second inductor; a discharge relay electrically coupled between the first discharge AC terminal and the second discharge AC terminal; and a controller configured to control a connection or disconnection state of the first relay and a connection or disconnection state of the interleaving relay, wherein the controller is further configured to connect the first relay and the interleaved relay to transmit the battery power of the battery to the external power source through the charge and discharge port, The battery charging device is further configured to input single-phase AC power to the first charging and discharging AC terminal. The battery charging device is further configured to input three phases of alternating current corresponding to the three-phase alternating current into the first charging and discharging AC terminal to the third charging and discharging AC terminal, respectively. The controller is further configured to connect the pre-charging relay in response to starting to input AC power to the first charge and discharge AC terminal. wherein the controller is further configured to disconnect the pre-charging relay in response to the voltage applied to the first inductor falling within a preset range, wherein the controller is further configured to connect the discharge relay to transmit battery power of the battery through the discharge port, wherein the controller is further configured to selectively connect or disconnect the first relay, the interleaving relay, and the discharge relay in response to a discharge mode of the battery, The discharge mode of the battery includes a first battery discharge mode for transmitting the battery power of the battery to the external power source through the charge and discharge port, wherein the controller is further configured to connect the first relay, connect the interleaving relay, and disconnect the discharge relay in response to the first battery discharge mode, The discharge mode of the battery further includes a second battery discharge mode for transmitting the battery power of the battery to the external power source through the discharge port, wherein the controller is further configured to connect the discharge relay, disconnect the first relay, and disconnect the interleaving relay in response to the second battery discharge mode, wherein the discharge mode of the battery further includes a simultaneous drive mode for transmitting the battery power of the battery to the external power source through the charge and discharge port and through the discharge port, and Wherein, the controller is further configured to connect the first relay, connect the interleaving relay, and connect the discharge relay in response to the simultaneous driving mode.

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