A charging and discharging device, method and system for a battery swap station

Abstract

The present invention discloses a charging and discharging device, method, and system for a battery swap station. The charging and discharging device includes: at least one bidirectional conversion module, at least one charging module, at least one bidirectional conversion control module, and at least one charging control module; the bidirectional conversion control module is used to control the bidirectional conversion module to charge the first battery when the voltage of the first battery is greater than a first threshold, or to control the bidirectional conversion module to supply power to the battery swap station; when the voltage of the first battery is less than or equal to a second threshold, the charging control module controls the charging module to charge the first battery; the first end of the charging control module is connected to the charging module, and is used to control the charging module to charge the first battery or the second battery. The charging and discharging device for the battery swap station provided by the present invention can not only convert AC power into DC power to charge the battery, but also convert the DC power of the battery into AC power to supply power to the battery swap station.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a charging and discharging device, method, and system for a battery swap station. Background Art

[0002] In the existing field of charging stack technology, the charging stack can only realize the energy flow from the AC power of the grid to the DC power of the battery to charge the battery, and the battery cannot reversely supply power to the grid. Summary of the Invention

[0003] The present invention provides a charging and discharging device, method and system for a battery swap station. By adopting multiple bidirectional conversion modules and multiple charging modules, the AC power of the battery swap station is converted into DC power to charge the battery, or the DC power of the battery is converted into AC power to supply the battery swap station, thereby realizing the bidirectional flow of electric energy and improving the conversion efficiency of electric energy.

[0004] According to a first aspect of the present invention, there is provided a charging and discharging device for a battery swap station, comprising: at least one bidirectional conversion module, at least one charging module, at least one bidirectional conversion control module, and at least one charging control module;

[0005] The input end of the bidirectional conversion module is connected to AC power, and the output end of the bidirectional conversion module is connected to the first battery; the bidirectional conversion module is used to convert AC power into DC power to charge the first battery, or to convert DC power of the first battery into AC power to power the battery swap station;

[0006] The input end of the charging module is connected to AC power, and the output end of the charging module is connected to the second battery; the charging module is used to convert AC power into DC power to charge the first battery or the second battery;

[0007] A first end of the bidirectional conversion control module is connected to the bidirectional conversion module, a second end of the bidirectional conversion control module is communicatively connected to the charging control module, and a third end of the bidirectional conversion control module is connected to the first battery. The bidirectional conversion control module is configured to control the bidirectional conversion module to charge the first battery when the charging voltage of the first battery is greater than a first threshold, or to control the bidirectional conversion module to supply power to the battery swap station.

[0008] When the voltage of the first battery is less than or equal to a second threshold, the charging control module controls the charging module to charge the first battery;

[0009] The first end of the charging control module is connected to the charging module, and the second end of the charging control module is connected to the second battery; the charging control module is used to control the charging module to charge the first battery or the second battery.

[0010] Optionally, it further includes at least one interface module;

[0011] The interface module is connected to the third end of the bidirectional conversion control module, and the interface module is also connected to the third end of the charging control module. The number of the interface modules is equal to the sum of the number of the bidirectional conversion control modules and the charging control modules; the interface module is used to transmit the electric energy of the bidirectional conversion module or the charging module to the first and second batteries or to transmit the electric energy of the first battery to the battery swap station.

[0012] Optionally, the interface module includes a first interface unit and a second interface unit;

[0013] The first interface unit is connected to the bidirectional conversion control module, and the second interface unit is connected to the charging control module;

[0014] The number of the first interface units is equal to the number of the bidirectional conversion modules; the number of the second interface units is equal to the number of the charging modules; wherein the charging modules are connected to the corresponding first interface units.

[0015] Optionally, a switch module is also included;

[0016] The positive pole and negative pole of the first end of the switch module are respectively connected to the positive pole and negative pole of the interface module, and the positive pole and negative pole of the second end of the switch module are respectively connected to the positive pole and negative pole of the charging module; the switch module is used to select the bidirectional conversion module to charge the first battery or supply power to the battery swap station when the voltage of the first battery is greater than a first threshold, and to select the charging module to charge the first battery when the voltage of the first battery is less than or equal to a second threshold.

[0017] Optionally, the bidirectional conversion module is composed of at least two bidirectional conversion units connected in parallel; and the charging module is composed of at least two charging units connected in parallel.

[0018] Optionally, the charging unit includes a one-way charging module.

[0019] Optionally, the charging unit further includes a bidirectional V2G module.

[0020] According to a second aspect of the present invention, a charging and discharging method for a battery swap station is provided, which is applicable to the charging and discharging device of the battery swap station described in any one of the first aspects. The charging and discharging method for the battery swap station includes:

[0021] obtaining a voltage of a first battery and a voltage of a second battery;

[0022] When the voltage of the first battery is greater than a first threshold, the bidirectional conversion control module controls the bidirectional conversion module to charge the first battery or controls the bidirectional conversion module to supply power to the battery swap station;

[0023] When the voltage of the first battery is less than or equal to a second threshold, the charging control module controls the charging module to charge the first battery;

[0024] When the voltage of the second battery is less than or equal to a third threshold, the charging control module controls the charging module to charge the second battery.

[0025] Optionally, the charging and discharging method of the battery swap station further includes:

[0026] obtaining a state of charge of the first battery;

[0027] When the state of charge is greater than a fourth threshold, the bidirectional conversion control module controls the bidirectional conversion module to stop charging the first battery;

[0028] When the state of charge is less than or equal to a fifth threshold, the bidirectional conversion control module controls the bidirectional conversion module to stop supplying power to the battery swap station; wherein the fourth threshold is greater than the fifth threshold.

[0029] According to a third aspect of the present invention, a charging and discharging system for a battery swap station is provided, comprising a box-type transformer and the charging and discharging device for the battery swap station according to any one of the first aspects.

[0030] The present invention discloses a charging and discharging device, method and system for a battery swap station, comprising at least one bidirectional conversion module, at least one charging module, at least one bidirectional conversion control module and at least one charging control module; the input end of the bidirectional conversion module is connected to alternating current, and the output end of the bidirectional conversion module is connected to a first battery; the bidirectional conversion module is used to convert alternating current into direct current to charge the first battery, or to convert the direct current of the first battery into alternating current to power the battery swap station; the input end of the charging module is connected to alternating current, and the output end of the charging module is connected to a second battery; the charging module is used to convert alternating current into direct current to charge the first battery or the second battery; the bidirectional conversion control module is used to convert alternating current into direct current to charge the first battery or the second battery The first end of the block is connected to the bidirectional conversion module, the second end of the bidirectional conversion control module is communicatively connected to the charging control module, and the third end of the bidirectional conversion control module is connected to the first battery. The bidirectional conversion control module is used to control the bidirectional conversion module to charge the first battery when the voltage of the first battery is greater than the first threshold, or to control the bidirectional conversion module to supply power to the battery swap station; when the voltage of the first battery is less than or equal to the second threshold, the charging control module controls the charging module to charge the first battery; the first end of the charging control module is connected to the charging module, and the second end of the charging control module is connected to the second battery; the charging control module is used to control the charging module to charge the first battery and / or the second battery. The charging and discharging device of the battery swap station provided by the present invention realizes the conversion of the AC power of the battery swap station into DC power to charge the battery, or the conversion of the DC power of the battery into AC power to supply power to the battery swap station by adopting multiple bidirectional conversion modules and multiple charging modules, thereby realizing the bidirectional flow of electric energy and improving the conversion efficiency of electric energy.

[0031] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a schematic structural diagram of a charging and discharging device of a battery swap station provided by an embodiment of the present invention;

[0034] Figure 2 yes Figure 1 Enlarged view of area A in the middle;

[0035] Figure 3 yes Figure 1 Enlarged view of area B in the middle;

[0036] Figure 4 This is a flow chart of a charging and discharging method for a battery swap station provided by an embodiment of the present invention;

[0037] Figure 5 This is a flow chart of another charging and discharging method of a battery swap station provided by an embodiment of the present invention;

[0038] Figure 6 This is a charging flow chart of a charging and discharging method of a battery swap station provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices. It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in the present invention can be performed in parallel, can be performed sequentially, or can be performed in a different order. As long as the desired results of the technical solution of the present invention can be achieved, this document is not limited here.

[0041] Figure 1 This is a schematic diagram of the charging and discharging device structure of a battery swap station provided by an embodiment of the present invention, with reference to Figure 1The embodiment of the present invention provides a charging and discharging device for a battery swap station, comprising: at least one bidirectional conversion module 1, at least one charging module 2, at least one bidirectional conversion control module 3, and at least one charging control module 4; the input end of the bidirectional conversion module 1 is connected to AC power, and the output end of the bidirectional conversion module 1 is connected to the first battery C; the bidirectional conversion module 1 is used to convert AC power into DC power to charge the first battery C, or to convert the DC power of the first battery C into AC power to power the battery swap station 6; the input end of the charging module 2 is connected to AC power, and the output end of the charging module 2 is connected to the second battery E; the charging module 2 is used to convert AC power into DC power to charge the first battery C or the second battery E; the output end of the bidirectional conversion control module 3 is connected to the second battery E; the output end of the bidirectional conversion control module 3 is connected to the second battery E; the output end of the bidirectional conversion control module 3 is connected to the second battery E; the output end of the bidirectional conversion control module 3 is connected to the first battery C or ... One end is connected to the bidirectional conversion module 1, the second end of the bidirectional conversion control module 3 is communicatively connected to the charging control module 4, and the third end of the bidirectional conversion control module 3 is connected to the first battery C. The bidirectional conversion control module 3 is used to control the bidirectional conversion module 1 to charge the first battery C when the voltage of the first battery C is greater than the first threshold, or to control the bidirectional conversion module 1 to supply power to the battery swap station 6; when the voltage of the first battery C is less than or equal to the second threshold, the charging control module 4 controls the charging module 2 to charge the first battery C; the first end of the charging control module 4 is connected to the charging module 2, and the second end of the charging control module 4 is connected to the second battery E; the charging control module 4 is used to control the charging module 2 to charge the first battery C and / or the second battery E.

[0042] Optionally, the bidirectional conversion module 1 is composed of at least two bidirectional conversion units 11 connected in parallel; and the charging module 2 is composed of at least two charging units 21 connected in parallel.

[0043] Optionally, the bidirectional conversion unit 11 may be an energy storage converter.

[0044] Specifically, the battery swap station is used to output three-phase AC power. The input end of the bidirectional conversion module 1 composed of at least two bidirectional conversion units 11 connected in parallel is connected to the three-phase AC power, and the output end of the bidirectional conversion module 1 is connected to the first battery C; the input end of the charging module 2 composed of at least two charging units 21 connected in parallel is connected to the three-phase AC power, and the output end of the charging module 2 is connected to the second battery E; the bidirectional conversion module 1 is specifically used to convert the input three-phase AC power into DC power that can be used normally by the battery, and transmit the converted DC power to the first battery C to charge the first battery C; or to convert the DC power in the first battery C into AC power to power the battery swap station 6; the charging module 2 is used to convert the input three-phase AC power The bidirectional conversion control module 3 controls the bidirectional conversion module 1 to charge the first battery C or to control the bidirectional conversion module 1 to supply power to the battery swap station 6 when the voltage of the first battery C is greater than the first threshold value; the bidirectional conversion control module 4 controls the charging module 2 to charge the first battery C; and the bidirectional conversion control module 3 controls the bidirectional conversion module 1 to supply power to the battery swap station 6 when the voltage of the first battery C is less than or equal to the second threshold value. When the voltage of the first battery C is greater than the first threshold value, the bidirectional conversion control module 3 controls the bidirectional conversion module 1 to supply power to the battery swap station 6. It is understandable that when the voltage of the first battery C is greater than the first threshold value, the first battery C can either continue to charge or supply power to the battery swap station 6 and feed it back to the power grid. When it is detected that the voltage of the first battery C is greater than the first threshold, since the operating voltage of the bidirectional conversion module 1 is above the first threshold, and the operating voltage of the charging module 2 is between 0V and the first threshold, when the first battery C is in the charging state and the voltage of the first battery C is greater than the first threshold, it is necessary to switch to the bidirectional conversion module 1 to charge the first battery C; when the first battery C is in the charging state and the voltage of the first battery C is less than or equal to the second threshold, it is necessary to switch to the charging module 2 to charge the first battery C, or when the voltage of the first battery C is greater than the first threshold, the bidirectional conversion module 1 can also be controlled to power the battery swap station 6 (that is, convert the DC power in the first battery C into AC power to power the battery swap station 6). The first threshold and the second threshold are set as needed. For example, the first threshold can be 600V and the second threshold can be 200V, and the present invention is not limited to this.

[0045] An embodiment of the present invention provides a charging and discharging device for a battery swap station, which converts the AC power of the battery swap station into DC power to charge the battery, or converts the DC power of the battery into AC power to supply the battery swap station through a bidirectional conversion module composed of multiple bidirectional conversion units connected in parallel and a charging module composed of multiple charging units connected in parallel, thereby realizing a bidirectional flow of electric energy and improving the conversion efficiency of electric energy.

[0046] Optionally, the first battery C, the second battery E, and the battery D include a battery replacement battery or a vehicle-mounted battery. Optionally, the charging unit 21 includes a unidirectional charging module or a bidirectional V2G module.

[0047] Specifically, the V2G (Vehicle-to-Grid, V2G) module is a smart grid technology that allows two-way exchange of electric energy between electric vehicles and the power grid; it can be understood that in the embodiment of the present invention, the charging unit 21 is allowed to be a V2G module. When the charging unit is replaced with a V2G module, it can be achieved that when the voltage of the second battery E is less than or equal to the first threshold, the charging control module 4 controls the charging module 2 to supply power to the battery swap station 6. It can be understood that at this time, the charging module 2 also has the function of bidirectional charging.

[0048] Figure 2 yes Figure 1 Enlarged view of area A in the middle; Figure 3 yes Figure 1 Enlarged view of area B in the middle, refer to Figure 1 、 Figure 2 and 3 , optionally, it also includes at least one interface module 7; the interface module 7 is connected to the third end of the bidirectional conversion control module 3, and the interface module 7 is also connected to the third end of the charging control module 4. The number of interface modules 7 is equal to the sum of the number of bidirectional conversion control modules 3 and the charging control modules 4; the interface module 7 is used to transmit the electric energy of the bidirectional conversion module 1 or the charging module 2 to the first battery C and the second battery E, or to transmit the electric energy of the first battery C to the battery swap station 6.

[0049] Specifically, the interface module 7 is connected to the third end of the bidirectional conversion control module 3 and is also connected to the third end of the charging control module 4. The number of interface modules 7 is equal to the sum of the number of bidirectional conversion control modules 3 and the charging control modules 4. The main function is to transmit the direct current converted by the bidirectional conversion module 1 to the first battery C, battery D and the second battery E for charging or to convert the electrical energy in the first battery C and / or battery D into alternating current and transmit it to the battery swap station 6.

[0050] Optional, continue to refer to Figure 1 、 Figure 2 and 3 The interface module 7 includes a first interface unit 71 and a second interface unit 72; the first interface unit 71 is connected to the bidirectional conversion control module 3, and the second interface unit 72 is connected to the charging control module 4; the number of the first interface units 71 is equal to the number of the bidirectional conversion modules 1; the number of the second interface units 72 is equal to the number of the charging modules 2; wherein the charging modules 2 are connected to the corresponding first interface units 71.

[0051] Specifically, by Figure 1 、 Figure 2 and Figure 3 As shown, the number of first interface units 71 is equal to the number of bidirectional conversion modules 1; the number of second interface units 72 is equal to the number of charging modules 2. It can be understood that each bidirectional conversion module 1 corresponds to a first interface unit 71, and each charging module 2 corresponds to a second interface unit 72, wherein the charging module 2 is connected to the corresponding first interface unit 71.

[0052] Optionally, a switch module 8 is also included; the positive pole and negative pole of the first end of the switch module 8 are respectively connected to the positive pole and negative pole of the interface module 7, and the positive pole and negative pole of the second end of the switch module 8 are respectively connected to the positive pole and negative pole of the charging module 2; the switch module 8 is used to select the bidirectional conversion module 1 to charge the first battery C or supply power to the battery swap station 6 when the voltage of the first battery C is greater than the first threshold, and select the charging module 2 to charge the first battery C when the voltage of the first battery C is less than or equal to the second threshold.

[0053] For details, please refer to Figure 1 The first end of the switch module 8 is connected to any one of the interface modules 7, and the second end of the switch module 8 is connected to the charging module 2. When the voltage of the first battery C is greater than the first threshold, the bidirectional conversion module 1 is selected to charge the first battery C or supply power to the battery swap station 6. When the voltage of the first battery C is less than or equal to the second threshold, the charging module 2 is selected to charge the first battery C. It can be understood that the first battery C may be in a charging state. Then, when the voltage of the first battery C is greater than the first threshold, the first battery C needs to be charged by the bidirectional conversion module 1; the first battery C may not be in a charging state. When the voltage of the first battery C is greater than the first threshold, it can be discharged to the outside, that is, it can supply power to the battery swap station 6 or feed back to the power grid. The bidirectional conversion module corresponding to the battery D can also achieve such technical effects, which will not be repeated here.

[0054] According to the same inventive concept, an embodiment of the present invention further provides a charging and discharging method for a battery swap station, which is applicable to any of the charging and discharging devices of the above-mentioned battery swap stations. Figure 4 This is a flow chart of a charging and discharging method of a battery swap station provided by an embodiment of the present invention, refer to Figure 4 , the charging and discharging methods of the battery swap station include:

[0055] S1: Acquire the voltage of the first battery and the voltage of the second battery.

[0056] Specifically, the voltages of the first battery and the second battery are monitored and obtained in real time.

[0057] S2: When the voltage of the first battery is greater than a first threshold, the bidirectional conversion control module controls the bidirectional conversion module to charge the first battery or controls the bidirectional conversion module to supply power to the battery swap station.

[0058] Specifically, when the voltage of the first battery is greater than a first threshold, the first battery can continue to charge or supply power to the battery swap station and feed it back to the power grid. When it is detected that the voltage of the first battery is greater than the first threshold, since the operating voltage of the bidirectional conversion module is above the first threshold and the operating voltage of the charging module is between 0V and the first threshold, when the first battery is in a charging state and the voltage of the first battery is greater than the first threshold, it is necessary to switch to the bidirectional conversion module to charge the first battery; or when the voltage of the first battery C is greater than the first threshold, the bidirectional conversion module can also be controlled to supply power to the battery swap station (i.e., convert the DC power in the first battery into AC power to supply the battery swap station).

[0059] S3: When the voltage of the first battery is less than or equal to a second threshold, the charging control module controls the charging module to charge the first battery. Specifically, when the voltage of the first battery is less than or equal to the second threshold, it indicates that the first battery is in a low-power state and urgently needs to be charged, and the charging control module controls the charging module to charge the first battery.

[0060] S4: When the voltage of the second battery is less than or equal to a third threshold, the charging control module controls the charging module to charge the second battery.

[0061] Specifically, when it is detected that the voltage of the second battery is less than or equal to the third threshold, it is proved that the second battery is in a low-power state, and the charging control module controls the charging module to charge the second battery.

[0062] Figure 5 This is a flow chart of another charging and discharging method of a battery swap station provided by an embodiment of the present invention; Figure 5 Optionally, the charging and discharging method further includes:

[0063] S100: Acquire the state of charge of the first battery.

[0064] Specifically, the state of charge of the first battery is monitored and obtained in real time. The state of charge (SOC) is an indicator that measures the ratio of the remaining capacity of a battery to its fully charged state capacity, and is usually expressed as a percentage. Real-time acquisition of the state of charge of the first battery can accurately know whether the battery needs to be charged or whether it can be discharged externally (i.e., feeding back power to the power grid of the battery swap station).

[0065] S200 : When the state of charge is greater than a fourth threshold, the bidirectional conversion control module controls the bidirectional conversion module to stop charging the first battery.

[0066] Specifically, when it is detected that the state of charge is greater than the fourth threshold, it proves that the battery is now in a fully charged state. The bidirectional conversion control module controls the bidirectional conversion module to stop charging the first battery, that is, to end the charging state of the battery to prevent damage to the battery life.

[0067] S300: When the state of charge is less than or equal to a fifth threshold, the bidirectional conversion control module controls the bidirectional conversion module to stop supplying power to the battery swap station; wherein the fourth threshold is greater than the fifth threshold.

[0068] Specifically, when the state of charge is less than or equal to the fifth threshold, it proves that the first battery is in a power-deficient state at this time. The attribute conversion control module controls the attribute conversion module to stop supplying power to the battery swap station, that is, to end the discharge state of the battery to prevent the battery life from being shortened due to over-discharge.

[0069] Figure 6 This is a charging flow chart of a charging and discharging method of a battery swap station provided by an embodiment of the present invention, with reference to Figure 6 Optionally, the charging process in the charging and discharging method provided in the embodiment of the present invention is:

[0070] S21: Forward the battery compartment related signal to the station control.

[0071] S22: Does the station control issue a charging instruction? If so, proceed to the next step S23; if not, return to step S21.

[0072] S23: Output auxiliary power, wake up the BMS (Battery Management System), and read the battery voltage value.

[0073] S24: Voltage > 600V? Detect whether the battery voltage is greater than 600V. If so, proceed to step S35; if not, proceed to step S25.

[0074] S25: Query the status of the charging module.

[0075] S26: Is the charging module idle? Check whether the charging module is in a resting state. If so, proceed to step S28; if not, return to S25.

[0076] S27: Is it necessary to seize the charging module? If yes, proceed to step S28; if no, return to step S25.

[0077] S28: Send a request instruction to occupy the charging module.

[0078] S29: Does the charging module accept the request? If so, the process proceeds to step S30; if not, the process returns to step S25.

[0079] S30: Start the charging module to initiate the charging process.

[0080] S31: Charge the battery according to the charging process.

[0081] S32: Voltage > 600V? If the battery voltage is greater than 600V, proceed to step S33; if the battery voltage is not greater than 600V, return to step S31.

[0082] S33: Reduce the current of the charging module, start the bidirectional conversion module, and increase the current of the bidirectional conversion module.

[0083] S34: Is the charging module current 0? If the charging module current is 0, it means the battery has been charged and the process proceeds to step S35; if not, it means the battery is not fully charged and the process returns to step S33.

[0084] S35: Stop the charging module and clear the request, and turn off the charging module switch.

[0085] S36: Start the bidirectional conversion module to initiate the charging process.

[0086] S37: Charge the battery according to the charging process.

[0087] S38: After step S35, determine whether the full condition is met. If so, proceed to step S40; if not, return to step S30.

[0088] S39: After step S37, determine whether the full condition is met. If so, proceed to step S40; if not, return to step S37.

[0089] S40: Stop charging.

[0090] According to the same inventive concept, an embodiment of the present invention further provides a charging and discharging system for a battery swap station, comprising a box-type transformer and any of the above-mentioned charging and discharging devices for the battery swap station.

[0091] The charging and discharging system of the battery swap station provided in the embodiment of the present invention has the same technical effects as any of the charging and discharging devices of the battery swap station mentioned above, and will not be described in detail here.

[0092] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A charging and discharging device for a battery swap station, characterized in that: include: at least one bidirectional conversion module, at least one charging module, at least one bidirectional conversion control module, and at least one charging control module; The input end of the bidirectional conversion module is connected to AC power, and the output end of the bidirectional conversion module is connected to the first battery; the bidirectional conversion module is used to convert AC power into DC power to charge the first battery, or to convert DC power of the first battery into AC power to power the battery swap station; The input end of the charging module is connected to AC power, and the output end of the charging module is connected to the second battery; the charging module is used to convert AC power into DC power to charge the first battery or the second battery; A first end of the bidirectional conversion control module is connected to the bidirectional conversion module, a second end of the bidirectional conversion control module is communicatively connected to the charging control module, and a third end of the bidirectional conversion control module is connected to the first battery. The bidirectional conversion control module is configured to control the bidirectional conversion module to charge the first battery when the voltage of the first battery is greater than a first threshold, or to control the bidirectional conversion module to supply power to the battery swap station. When the voltage of the first battery is less than or equal to a second threshold, the charging control module controls the charging module to charge the first battery; The first end of the charging control module is connected to the charging module, and the second end of the charging control module is connected to the second battery; the charging control module is used to control the charging module to charge the first battery and / or the second battery.

2. The charging and discharging device of the battery swap station according to claim 1, characterized in that: Also comprising at least one interface module; The interface module is connected to the third end of the bidirectional conversion control module, and the interface module is also connected to the third end of the charging control module. The number of the interface modules is equal to the sum of the number of the bidirectional conversion control modules and the charging control modules; the interface module is used to transmit the electric energy of the bidirectional conversion module or the charging module to the first battery and the second battery or to transmit the electric energy of the first battery to the battery swap station.

3. The charging and discharging device of the battery swap station according to claim 2, characterized in that: The interface module includes a first interface unit and a second interface unit; The first interface unit is connected to the bidirectional conversion control module, and the second interface unit is connected to the charging control module; The number of the first interface units is equal to the number of the bidirectional conversion modules; the number of the second interface units is equal to the number of the charging modules; wherein the charging modules are connected to the corresponding first interface units.

4. The charging and discharging device of the battery swap station according to claim 2, characterized in that: Also includes at least one switch module; The positive pole and negative pole of the first end of the switch module are respectively connected to the positive pole and negative pole of the interface module, and the positive pole and negative pole of the second end of the switch module are respectively connected to the positive pole and negative pole of the charging module; the switch module is used to select the bidirectional conversion module to charge the first battery or supply power to the battery swap station when the voltage of the first battery is greater than a first threshold, and to select the charging module to charge the first battery when the voltage of the first battery is less than or equal to a second threshold.

5. The charging and discharging device of the battery swap station according to claim 1, characterized in that: The bidirectional conversion module is composed of at least two bidirectional conversion units connected in parallel; the charging module is composed of at least two charging units connected in parallel.

6. The charging and discharging device of the battery swap station according to claim 5, characterized in that: The charging unit includes a one-way charging module.

7. The charging and discharging device of the battery swap station according to claim 5, characterized in that: The charging unit also includes a bidirectional V2G module.

8. A charging and discharging method for a battery swap station, characterized in that: A charging and discharging device applicable to a battery swap station according to any one of claims 1 to 7, wherein the charging and discharging method of the battery swap station comprises: obtaining a voltage of a first battery and a voltage of a second battery; When the voltage of the first battery is greater than a first threshold, the bidirectional conversion control module controls the bidirectional conversion module to charge the first battery or controls the bidirectional conversion module to supply power to the battery swap station; When the voltage of the first battery is less than or equal to a second threshold, the charging control module controls the charging module to charge the first battery; when the voltage of the second battery is less than or equal to a third threshold, the charging control module controls the charging module to charge the second battery.

9. The charging and discharging method of a battery swap station according to claim 8, characterized in that: The charging and discharging method of the battery swap station further includes: obtaining a state of charge of the first battery; When the state of charge is greater than a fourth threshold, the bidirectional conversion control module controls the bidirectional conversion module to stop charging the first battery; When the state of charge is less than or equal to a fifth threshold, the bidirectional conversion control module controls the bidirectional conversion module to stop supplying power to the battery swap station; wherein the fourth threshold is greater than the fifth threshold.

10. A charging and discharging system for a battery swap station, characterized in that: A charging and discharging device for a battery swap station comprising a box-type transformer and any one of claims 1-7.

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