Electromagnetic protection circuit and battery swap station

Abstract

The utility model discloses an electromagnetic protection circuit and a battery swap station, the battery swap station comprises a battery swap system, the battery swap system is used for converting alternating current provided by a power grid into direct current, the electromagnetic protection circuit comprises an alternating current protection module, the input end of the alternating current protection module is used for being connected with the power grid, and the output end of the alternating current protection module is connected with the battery swap system; the input end of the direct current protection module is connected with the output end of the battery replacement system, and the output end of the direct current protection module is used for being connected with a battery pack; and the direct current protection module is used for filtering a charging loop and a signal loop between the battery replacement system and the battery pack. According to the embodiment of the invention, electromagnetic interference signal filtering can be carried out on the loop among the power grid, the charging module and the battery pack, the electromagnetic interference influence is improved, and the electromagnetic interference resistance of the battery swap station is improved.

Description

Technical Field

[0001] The present application belongs to the field of electromagnetic interference technology, and in particular, relates to an electromagnetic protection circuit and a battery swap station. Background Art

[0002] With the continuous development of the new energy vehicle field, the popularity of new energy vehicles continues to rise. In order to solve the problems faced by new energy vehicles in charging and endurance, there are currently two research directions, namely improving charging power and adopting battery replacement technology.

[0003] Battery swapping technology is to build a large number of battery swapping stations to remove the battery packs with lower power in the vehicle and replace them with battery packs with higher power. Since the battery swapping process does not require charging the original battery pack and can be directly replaced with a battery pack with higher power, it can save a lot of time compared to charging, and is more efficient and faster.

[0004] However, in the currently constructed battery swap stations, since there is no standardized and exemplary design specification for battery swap stations, when the battery swap station uses the charging system to charge the battery pack removed from the vehicle, due to the high charging power, a high voltage and a large current will be generated in the charging circuit. The high voltage and high current charging circuit will generate strong electromagnetic interference, which will interfere with other modules of the battery swap station and even the battery swap vehicle, which may easily cause other modules in the battery swap station to be damaged by the electromagnetic interference of the charging circuit, and may also cause the battery swap vehicle to falsely trigger the alarm under electromagnetic interference. Utility Model Content

[0005] The embodiments of the present application provide an electromagnetic protection circuit and a battery swap station, which can solve the problem of strong electromagnetic interference caused by the high voltage and large current generated by the battery swap station when charging the battery pack in the related art.

[0006] In a first aspect, an embodiment of the present application provides an electromagnetic protection circuit, which is applied to a battery swap station. The battery swap station includes a battery swap system, which is used to convert alternating current provided by a power grid into direct current. The electromagnetic protection circuit includes:

[0007] AC protection module, the input end of the AC protection module is used to connect to the power grid, and the output end of the AC protection module is connected to the power exchange system; the AC protection module is used to filter the AC power provided by the power grid;

[0008] A DC protection module, the input end of the DC protection module is connected to the output end of the battery swap system, and the output end of the DC protection module is used to connect to the battery pack; the DC protection module is used to filter the charging circuit and signal circuit between the battery swap system and the battery pack.

[0009] In some embodiments, the battery swap system includes a charging module and an AC load;

[0010] The AC protection module includes:

[0011] An external protection module, which is arranged outside the battery swap station, and an input end of the external protection module is used to connect to the power grid;

[0012] An internal protection module is arranged inside the battery swap station, an input end of the internal protection module is connected to an output end of the external protection module, and multiple output ends of the internal protection module are respectively connected to a charging module and at least one AC load.

[0013] In some embodiments, the internal protection module includes:

[0014] A first protection module, the first protection module is connected between the external protection module and the charging module;

[0015] At least one second protection module is connected between the external protection module and the corresponding AC load.

[0016] In some embodiments, the first protection module includes:

[0017] A three-phase common-mode inductor, wherein the three input ends of the three-phase common-mode inductor are respectively connected to the three-phase output ends of the external protection module, and the three output ends of the three-phase common-mode inductor are respectively connected to the three-phase power supply ends of the charging module;

[0018] Three first differential mode capacitors, first ends of the three first differential mode capacitors are respectively connected to three input ends of the three-phase common mode inductor;

[0019] Three second differential mode capacitors, first ends of the three second differential mode capacitors are respectively connected to the three output ends of the three-phase common mode inductor;

[0020] Two first common mode capacitors, one of which is connected between the second ends of the three first differential mode capacitors and the ground, and the other of which is connected between the second ends of the three second differential mode capacitors and the ground.

[0021] In some embodiments, the AC load of the battery swap station is single-phase two-wire power supply; the second protection module includes:

[0022] Two first differential mode inductors, first ends of the two first differential mode inductors are respectively connected to two AC power supply ends;

[0023] A first single-phase common-mode inductor, wherein two input ends of the first single-phase common-mode inductor are respectively connected to the second ends of the two first differential-mode inductors, and two output ends of the first single-phase common-mode inductor are connected to an AC load;

[0024] Three third differential mode capacitors are respectively connected between the first ends of the two first differential mode inductors, between the second ends of the two first differential mode inductors, and between the two output ends of the first single-phase common mode inductor;

[0025] Two second common-mode capacitors, one of which is connected between one input terminal of the first single-phase common-mode inductor and the ground terminal, and the other second common-mode capacitor is connected between the other input terminal of the first single-phase common-mode inductor and the ground terminal.

[0026] In some embodiments, the first differential mode inductor is an amorphous inductor, and the first single-phase common mode inductor is a nanocrystalline common mode inductor.

[0027] In some embodiments, the DC protection module includes:

[0028] A DC charging protection module, which is connected between the charging module and the battery pack and is used to filter the charging circuit between the charging module and the battery pack;

[0029] A DC signal protection module, which is connected between the charging module and the battery pack and is used to filter the signal loop between the charging module and the battery pack;

[0030] The isolation module is arranged between the DC charging protection module and the DC signal protection module, and is used to isolate the DC charging protection module from the DC signal protection module.

[0031] In some embodiments, the DC charging protection module includes:

[0032] A second common-mode inductor, wherein two input ends of the second common-mode inductor are respectively connected to two DC output ends of the charging module, and two output ends of the second common-mode inductor are respectively connected to a positive electrode of the battery pack and a negative electrode of the battery pack;

[0033] Two fourth differential mode capacitors are respectively connected between the two input ends of the second common mode inductor and between the two output ends of the second common mode inductor;

[0034] Two third common-mode capacitors, one of which is connected between one output terminal of the second common-mode inductor and the ground terminal, and the other of which is connected between the other output terminal of the second common-mode inductor and the ground terminal.

[0035] In some embodiments, the two fourth differential mode capacitors and the two third common mode capacitors are withstand voltage DC capacitors, and the withstand voltage value of the withstand voltage DC capacitors is greater than the maximum output voltage of the charging module; the second common mode inductor is a nanocrystalline common mode inductor, and the inner diameter of the nanocrystalline magnetic ring of the nanocrystalline common mode inductor is greater than 50 mm.

[0036] In some embodiments, the DC signal protection module includes:

[0037] Two second differential mode inductors, wherein first ends of the two second differential mode inductors are respectively connected to two signal control ends of the charging module;

[0038] A third common-mode inductor, wherein two input ends of the third common-mode inductor are respectively connected to the second ends of the two second differential-mode inductors, and two output ends of the third common-mode inductor are connected to the two signal control ends of the battery pack;

[0039] Three fifth differential mode capacitors are respectively connected between the first ends of the two second differential mode inductors, between the second ends of the two second differential mode inductors, and between the two output ends of the third common mode inductor;

[0040] Two fourth common-mode capacitors, one of which is connected between one input terminal of the third common-mode inductor and the ground terminal, and the other fourth common-mode capacitor is connected between the other input terminal of the third common-mode inductor and the ground terminal.

[0041] In some embodiments, the DC charging protection module and the DC signal protection module are disposed in an isolation cabin of the battery swap station, and the isolation module includes a metal plate disposed between the DC charging protection module and the DC signal protection module.

[0042] In a second aspect, an embodiment of the present application further provides a battery swap station, which includes the electromagnetic protection circuit of the first aspect.

[0043] The electromagnetic protection circuit and battery swap station provided in the embodiments of the present application, by setting an AC protection module and a DC protection module, can filter the circuit between the power grid and the charging module, the charging circuit between the charging module and the battery pack, and the signal circuit between the charging module and the battery pack in the battery swap station, respectively, thereby improving the influence of electromagnetic interference signals and enhancing the electromagnetic anti-interference capability of the battery swap station. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 It is a schematic diagram of the module structure of an electromagnetic protection circuit provided in an embodiment of the present application;

[0046] Figure 2 is a schematic diagram of a module structure of an electromagnetic protection circuit provided in another embodiment of the present application;

[0047] Figure 3 This is a schematic diagram of the module structure of an electromagnetic protection circuit provided by another embodiment of the present application;

[0048] Figure 4 is a schematic diagram of the circuit structure of a first protection module provided in an embodiment of the present application;

[0049] Figure 5 is a schematic diagram of the circuit structure of a second protection module provided in an embodiment of the present application;

[0050] Figure 6 1 is a schematic diagram of the circuit structure of a DC charging protection module provided in an embodiment of the present application;

[0051] Figure 7 1 is a schematic diagram of the circuit structure of a DC signal protection module provided in an embodiment of the present application;

[0052] Figure 8 It is a structural diagram of a DC protection module provided in one embodiment of the present application.

[0053] In the attached figure:

[0054] 1. Battery swap station; 10. AC protection module; 20. DC protection module; 21. DC charging protection module; 22. DC signal protection module; 23. Isolation module; 50. Power grid; 60. Battery swap system; 61. Charging module; 62. AC load; 70. Battery pack; 80. Vehicle battery swap platform; 11. External protection module; 12. Internal protection module; 121. First protection module; 122. Second protection module; LCM, three-phase common mode inductor; CX1, first differential mode inductor Capacitor; CX2, second differential mode capacitor; CX3, third differential mode capacitor; CX4, fourth differential mode capacitor; CX5, fifth differential mode capacitor; CY1, first common mode capacitor; CY2, second common mode capacitor; CY3, third common mode capacitor; CY4, fourth common mode capacitor; LDM1, first differential mode inductor; LDM2, second differential mode inductor; LCM1, first single-phase common mode inductor; LCM2, second common mode inductor; LCM3, third common mode inductor; 41, metal plate; 42, isolation cabin. DETAILED DESCRIPTION

[0055] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0056] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0057] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0058] With the continuous development of the new energy vehicle field, the popularity of new energy vehicles continues to rise. In order to solve the problems faced by new energy vehicles in charging and endurance, there are currently two research directions, namely improving charging power and adopting battery replacement technology.

[0059] Battery swapping technology is to build a large number of battery swapping stations to remove the battery packs with lower power in the vehicle and replace them with battery packs with higher power. Since the battery swapping process does not require charging the original battery pack and can be directly replaced with a battery pack with higher power, it can save a lot of time compared to charging, and is more efficient and faster.

[0060] However, in the currently constructed battery swap stations, since there is no standardized and exemplary design specification for battery swap stations, when the battery swap station uses the charging system to charge the battery pack removed from the vehicle, due to the high charging power, a high voltage and a large current will be generated in the charging circuit. The high voltage and high current charging circuit will generate strong electromagnetic interference, which will interfere with other modules of the battery swap station and even the battery swap vehicle, which may easily cause other modules in the battery swap station to be damaged by the electromagnetic interference of the charging circuit, and may also cause the battery swap vehicle to falsely trigger the alarm under electromagnetic interference.

[0061] In order to solve the above technical problems, the embodiment of the present application provides an electromagnetic protection circuit and a battery swap station. The electromagnetic protection circuit provided by the embodiment of the present application is described in detail below through some embodiments and application scenarios in conjunction with the accompanying drawings.

[0062] Figure 1 The schematic diagram of the module structure of the electromagnetic protection circuit provided by an embodiment of the present application is shown. The electromagnetic protection circuit can be applied to a power exchange station 1, and the power exchange station 1 can include a power exchange system 60, which can convert the AC power provided by the power grid 50 into DC power. The electromagnetic protection circuit includes an AC protection module 10 and a DC protection module 20.

[0063] The input end of the AC protection module 10 can be connected to the power grid 50, and the output end of the AC protection module 10 is connected to the power exchange system of the power exchange station 1. The AC protection module 10 can filter the AC power provided by the power grid 50, and provide the filtered AC power to the power exchange system 60. After receiving the AC power, the power exchange system 60 can convert the AC power into DC power and charge the battery pack 70.

[0064] The input end of the DC protection module 20 is connected to the output end of the battery swap system 60, and the output end of the DC protection module 20 can be connected to the battery pack 70. After the battery swap system 60 is connected to the battery pack 70 and a charging circuit and a signal circuit are formed, the DC protection module 20 can filter the DC charging voltage output by the battery swap system 60 to achieve filtering of the charging circuit. The DC protection module 20 can also filter the signal circuit between the battery swap system 60 and the battery pack 70. The signal circuit is composed of a signal line between the battery swap system 60 and the battery pack 70, and the voltage signal transmitted by the signal line is usually lower than the DC charging voltage output by the battery swap system 60. That is, when the battery swap system 60 charges the battery pack 70, the signal voltage on the signal circuit is lower than the DC charging voltage on the charging circuit.

[0065] The above-mentioned battery pack 70 refers to the battery pack 70 with low power on the battery swap vehicle after the battery swap vehicle enters the vehicle battery swap platform 80 of the battery swap station 1, and the disassembly device in the battery swap station 1 disassembles the battery pack 70 with low power on the battery swap vehicle and stores it in the corresponding storage area. In order to meet the battery swap needs of the battery swap vehicle, the battery swap station 1 should improve the charging efficiency as much as possible when charging the disassembled battery pack 70. For example, when the AC power provided by the power grid is 380VAC and the DC charging voltage required by the battery pack 70 of the battery swap vehicle is 800V DC, the battery swap system 60 needs to generate 800V DC from 380VAC through inverter transformation, and in order to increase the charging power, the battery swap system 60 needs to maintain a high power output for a long time. That is, the battery swap system 60 is a device with a long operating time and a large power load in the battery swap station 1. During the charging process of the battery pack 70, there is high voltage and high current, which is easy to generate strong electromagnetic interference. By setting a DC protection module 20 to filter the electromagnetic interference signal in the charging circuit, the interference effect on other modules in the battery swap station 1 can be reduced. In addition, since a low-voltage control signal line is also connected between the battery swap system 60 and the battery pack 70, signal transmission and charging control between the battery swap system 60 and the battery pack 70 can be realized. The control signal line is close to the connection line of the charging circuit and is more susceptible to the high voltage and high current on the charging circuit. Therefore, the DC protection module 20 can also reduce the interference effect on the signal line of the control part by filtering the charging circuit.

[0066] The DC protection module 20 can also filter the signal loop between the battery replacement system 60 and the battery pack 70 .

[0067] The battery swap station 1 includes multiple functional modules. For example, in addition to the charging module 61 for charging the battery 70, the battery swap system 60 also includes a slide rail module, a handling module, a storage module, and a security module and a monitoring module included in the peripheral system of the battery swap station 1. Each functional module will also generate electromagnetic interference during operation. In order to avoid the interference of each module on the signal circuit between the battery swap system 60 and the battery pack 70, a DC protection module 20 can be set to filter out the interference signal on the signal circuit when communicating between the battery swap system 60 and the battery pack 70 to prevent the signal circuit from being affected by electromagnetic interference.

[0068] It should be noted that the AC protection module 10 is arranged at the AC power supply end of the battery exchange system 60. When the battery exchange system 60 charges the battery pack 70, the AC protection module 10 can also prevent electromagnetic interference signals from interfering with the power grid 50.

[0069] In the above embodiment, by setting up an AC protection module 10 and a DC protection module 20, the circuit between the power grid 50 and the battery exchange system 60 in the battery exchange station 1, the charging circuit between the battery exchange system 60 and the battery pack 70, and the signal circuit between the battery exchange system 60 and the battery pack 70 can be filtered respectively, thereby improving the influence of electromagnetic interference signals and enhancing the electromagnetic anti-interference ability of the battery exchange station 1.

[0070] Please refer to Figure 2 In some embodiments, the battery replacement system 60 may include a charging module 61 and an AC load 62. The AC protection module 10 may include an external protection module 11 and an internal protection module 12.

[0071] The external protection module 11 can be arranged outside the battery swap station 1, and the input end of the external protection module 11 can be connected to the power grid 50. The internal protection module 12 can be arranged inside the battery swap station 1, and the input end of the internal protection module 12 is connected to the output end of the external protection module 11. The internal protection module 12 includes multiple output ends, and the multiple output ends are respectively connected to the charging module 61 and at least one AC load 62.

[0072] The above-mentioned AC load 62 can be other functional modules in the battery exchange system 60 except the charging module 61, such as the slide rail module, transportation module, storage module included in the battery exchange station 1 operation system and the security module and monitoring module included in the peripheral system of the battery exchange station 1.

[0073] The above-mentioned external protection module 11 can be installed on the metal outer wall of the battery swap station 1, and a hole is opened on the metal outer wall for the external protection module 11 to be connected to the internal protection module 12 in the battery swap station 1 through a connecting line.

[0074] The external protection module 11 can play a filtering role between the power grid 50 and the battery swap station 1 to avoid mutual interference between the power grid 50 and the battery swap station 1. The internal protection module 12 can play a filtering and protection role between the modules in the battery swap station 1 to avoid mutual interference between the modules in the battery swap station 1 during operation.

[0075] Please refer to Figure 3 In some embodiments, the internal protection module 12 may include a first protection module 121 and at least one second protection module 122 .

[0076] The first protection module 121 may be connected between the external protection module 11 and the charging module 61 , and the second protection module 122 may be connected between the external protection module 11 and the corresponding AC load 62 .

[0077] Between the power grid 50 and the charging module 61, there is an external protection module 11 arranged outside the battery swap station 1 and a first protection module 121 inside the battery swap station 1. The external protection module 11 and the first protection module 121 can realize port protection between the power grid 50 and the battery swap station 1, thereby reducing the electromagnetic interference between the power grid 50 and the battery swap module.

[0078] For a single AC load 62 , an external protection module 11 and a second protection module 122 are included between the power grid 50 and the AC load 62 . The external protection module 11 can provide electromagnetic protection for the power supply port of the power grid 50 , while the second protection module 122 can provide electromagnetic protection for the power supply port of the AC load 62 .

[0079] Between the AC load 62 and the charging module 61, there are a first protection module 121 and a second protection module 122. The first protection module 121 can provide electromagnetic protection for the power supply port of the charging module 61, and the second protection module 122 can provide electromagnetic protection for the power supply port of the AC load 62. The high voltage and high current generated by the charging module 61 during operation are filtered by the first protection module 121 and the second protection module 122, and the interference effect on the AC load 62 will be greatly reduced.

[0080] When the battery swap station 1 includes multiple AC loads 62, the number of the second protection modules 122 may correspond to the number of the AC loads 62, or may be less than the number of the AC loads 62. For example, the slide rail module, the transport module, and the storage module included in the operating system of the battery swap station 1 may share the same second protection module 122, and the security module and the monitoring module included in the peripheral system of the battery swap station 1 may also share the same second protection module 122.

[0081] Please refer to Figure 4 In some embodiments, the first protection module 121 may include a three-phase common mode inductor LCM, three first differential mode capacitors CX1, three second differential mode capacitors CX2 and two first common mode capacitors CY1.

[0082] The three input ends of the three-phase common mode inductor LCM are respectively connected to the three-phase output ends of the external protection module 11 , and the three output ends of the three-phase common mode inductor LCM are respectively connected to the three-phase power supply ends of the charging module 61 .

[0083] The first ends of the three first differential mode capacitors CX1 are respectively connected to the three input ends of the three-phase common mode inductor LCM, and the first ends of the three second differential mode capacitors CX2 are respectively connected to the three output ends of the three-phase common mode inductor LCM.

[0084] Among the two first common mode capacitors CY1, one first common mode capacitor CY1 is connected between the second ends of the three first differential mode capacitors CX1 and the ground, and the other first common mode capacitor CY1 is connected between the second ends of the three second differential mode capacitors CX2 and the ground.

[0085] The first differential mode capacitor CX1 can perform differential mode filtering on one side of the external protection module 11, and the second differential mode capacitor CX2 can perform differential mode filtering on one side of the charging module 61. By performing filtering protection on the port of the external protection module 11 and the port of the charging module 61 respectively, the port filtering technology can be used to reduce electromagnetic interference and improve the quality and reliability of power supply of the power grid 50.

[0086] As an optional implementation, the first differential mode capacitor CX1 and the second differential mode capacitor CX2 may be safety film capacitors, and the withstand voltage may be 275VAC or above. The capacitance of the first differential mode capacitor CX1 may be 2.2uF, and the capacitance of the second differential mode capacitor CX2 may be 4.7uF. The first common mode capacitor CY1 may be a safety film capacitor with a withstand voltage of 305VAC or above, and the capacitance may be 10uF.

[0087] The three-phase common mode inductor LCM can play a role in common mode filtering. By combining common mode filtering with differential mode filtering, it is possible to suppress common mode interference signals and differential mode interference signals, thereby improving the impact of electromagnetic interference.

[0088] As an optional implementation, the external protection module 11 and the first protection module 121 are both three-phase AC protection modules, so the external protection module 11 and the first protection module 121 have the same structure. The difference is that the external protection module 11 is connected between the power grid 50 and the first protection module 121, and the first protection module 121 is connected between the external protection module 11 and the charging module 61.

[0089] Please refer to Figure 5 In some embodiments, the AC load 62 of the above-mentioned battery swap station 1 can be a single-phase two-wire power supply, and the second protection module 122 can include two first differential mode inductors LDM1, a first single-phase common mode inductor LCM1, three third differential mode capacitors CX3 and two second common mode capacitors CY2.

[0090] When the AC load 62 is powered by a single-phase two-wire, taking the power grid 50 providing 380VAC as an example, in order to realize the power supply of the AC load 62, after the three output ends of the external protection module 11 pass through the wall of the battery swap station 1 through the connecting wires and enter the battery swap station 1, one phase can be taken from the three power supply connecting wires as a single-phase 220VAC to power the AC load 62.

[0091] For the two AC power supply ends of single-phase AC power, the first ends of the two first differential mode inductors LDM1 are respectively connected to the two AC power supply ends, the two input ends of the first single-phase common mode inductor LCM1 are respectively connected to the second ends of the two first differential mode inductors LDM1, and the two output ends of the first single-phase common mode inductor LCM1 are connected to the AC load 62.

[0092] Among the three third differential mode capacitors CX3, the first third differential mode capacitor CX3 is connected between the first ends of the two first differential mode inductors LDM1, the second third differential mode capacitor CX3 is connected between the second ends of the two first differential mode inductors LDM1, and the third third differential mode capacitor CX3 is connected between the two output ends of the first single-phase common mode inductor LCM1.

[0093] One of the two second common-mode capacitors CY2 is connected between one input terminal of the first single-phase common-mode inductor LCM1 and the ground terminal, and the other second common-mode capacitor CY2 is connected between the other input terminal of the first single-phase common-mode inductor LCM1 and the ground terminal.

[0094] In the two connecting lines of the single-phase two-wire, the two first differential mode inductors LDM1 perform differential mode filtering on the two connecting lines respectively, and the first single-phase common mode inductor LCM1 and the two second common mode capacitors CY2 can play the role of common mode filtering, thereby realizing the combination of differential mode filtering and common mode filtering.

[0095] As an optional embodiment, the third differential mode capacitor CX3 can be a safety film capacitor with a nominal withstand voltage of 275VAC. The capacitance values ​​of the three third differential mode capacitors CX3 are 2uF, 4uF, and 6uF from left to right, so that interference signals of different frequencies can be filtered. The second common mode capacitor CY2 can be a safety film capacitor with a withstand voltage of 305VAC or above, and the capacitance can be 47uF.

[0096] The inductance value of the first differential mode inductor LDM1 may be in the range of 100uH-200uH, and the inductance value of the first single-phase common mode inductor LCM1 may be in the range of 1mH-2mH.

[0097] In some embodiments, the first differential mode inductor LDM1 may be an amorphous inductor, that is, the magnetic ring in the first differential mode inductor LDM1 is a magnetic ring made of amorphous material. The first single-phase common mode inductor LCM1 is a nanocrystalline common mode inductor. That is, the magnetic ring in the first single-phase common mode inductor LCM1 is a magnetic ring made of nanocrystalline material.

[0098] In some embodiments, please refer to Figure 3 The DC protection module 20 may include a DC charging protection module 21 , a DC signal protection module 22 and an isolation module 23 .

[0099] The DC charging protection module 21 is connected between the charging module 61 and the battery pack 70 , and can filter the charging circuit between the charging module 61 and the battery pack 70 .

[0100] The DC signal protection module 22 is connected between the charging module 61 and the battery pack 70 , and can filter the signal loop between the charging module 61 and the battery pack 70 .

[0101] The isolation module 23 may be disposed between the DC charging protection module 21 and the DC signal protection module 22 to isolate the DC charging protection module 21 from the DC signal protection module 22 .

[0102] Among the multiple circuits of the battery swap station 1, the charging circuit usually has high voltage and high current, which is easy to generate relatively strong electromagnetic interference signals, while the signal circuit usually corresponds to low-voltage devices such as chips and circuit boards between the charging module 61 and the battery pack 70. In the mutual interference between the charging circuit and the signal circuit, it is usually the charging circuit that has a greater interference effect on the signal circuit. In order to improve the interference effect of the high-voltage and high-current charging circuit on the low-voltage signal circuit, an isolation module 23 can be set to isolate the DC charging protection module 21 from the DC signal protection module 22 to further reduce the interference effect of the charging circuit on the signal circuit.

[0103] Please refer to Figure 6In some embodiments, the DC charging protection module 21 may include a second common mode inductor LCM2, two fourth differential mode capacitors CX4 and two third common mode capacitors CY3.

[0104] The two input ends of the second common-mode inductor LCM2 are respectively connected to the two DC output ends of the charging module 61, and the two output ends of the second common-mode inductor LCM2 are respectively connected to the positive electrode of the battery pack 70 and the negative electrode of the battery pack 70.

[0105] One of the two fourth differential mode capacitors CX4 is connected between two input terminals of the second common mode inductor LCM2, and the other is connected between two output terminals of the second common mode inductor LCM2.

[0106] One of the two third common-mode capacitors CY3 is connected between one output terminal of the second common-mode inductor LCM2 and the ground terminal, and the other third common-mode capacitor CY3 is connected between the other output terminal of the second common-mode inductor LCM2 and the ground terminal.

[0107] In some embodiments, the above-mentioned two fourth differential mode capacitors CX4 and the two third common mode capacitors CY3 are withstand voltage DC capacitors, and the withstand voltage value of the withstand voltage DC capacitors is greater than the maximum output voltage of the charging module. One of the fourth common mode capacitors CY4 is connected between one of the input terminals and the ground terminal of the third common mode inductor LCM3, and the other fourth common mode capacitor CY4 is connected between the other input terminal and the ground terminal of the third common mode inductor LCM3. The common mode inductor can be a nanocrystalline common mode inductor, and the inner diameter of the nanocrystalline magnetic ring of the nanocrystalline common mode inductor can be greater than 50 mm.

[0108] The magnetic ring in the second common mode inductor LCM2 is a magnetic ring made of nanocrystalline material. During the charging process of the battery pack 70, in order to increase the charging power, it is necessary to maintain a large charging current. When the inner diameter of the magnetic ring is small, it cannot meet the demand for large current. Therefore, the inner diameter of the nanocrystalline magnetic ring can be set to be greater than 50 mm to meet the demand for charging current.

[0109] The capacitances of the two fourth differential mode capacitors CX4 may be 2uf and 4uF respectively from left to right, so as to filter the interference signals of different frequencies of the renal capsule. The capacitance of the third common mode capacitor CY3 may be in the range of 10nF-40nF.

[0110] Please refer to Figure 7 In some embodiments, the DC signal protection module 22 may include two second differential mode inductors LDM2, a third common mode inductor LCM3, three fifth differential mode capacitors CX5 and two fourth common mode capacitors CY4.

[0111] The first ends of the two second differential mode inductors LDM2 are respectively connected to the two signal control ends of the charging module 61, the two input ends of the third common mode inductor LCM3 are respectively connected to the second ends of the two second differential mode inductors LDM2, and the two output ends of the third common mode inductor LCM3 are connected to the two signal control ends of the battery pack 70.

[0112] The three fifth differential mode capacitors CX5 are respectively connected between the first ends of the two second differential mode inductors LDM2, between the second ends of the two second differential mode inductors LDM2, and between the two output ends of the third common mode inductor LCM3.

[0113] One of the two fourth common-mode capacitors CY4 is connected between one input terminal of the third common-mode inductor LCM3 and the ground terminal, and the other fourth common-mode capacitor CY4 is connected between the other input terminal of the third common-mode inductor LCM3 and the ground terminal.

[0114] It can be understood that the components and connection relationship of the DC signal protection module 22 are similar to those of the second protection module 122. Therefore, the circuit structure of the DC signal protection module 22 can be consistent with that of the second protection module 122. However, the second protection module 122 is a single-phase AC filter, while the DC signal protection module 22 is a low-voltage DC filter. Since the power supply voltage of the signal line in a low-voltage environment is usually below 12V DC, based on the above differences, when selecting each component in the circuit, the second differential mode inductor LDM2, the third common mode inductor LCM3, the fifth differential mode capacitor CX5 and the fourth common mode capacitor CY4 should meet the safety requirements in a DC power supply environment.

[0115] Please refer to Figure 8 In some embodiments, the above-mentioned battery swap station 1 further includes an isolation cabin 42. The DC charging protection module 21 and the DC signal protection module 22 can be arranged in the isolation cabin 42 of the battery swap station 1, and the isolation module 23 can include a metal plate 41 arranged between the DC charging protection module 21 and the DC signal protection module 22. The metal plate 41 can isolate the DC charging protection module 21 from the DC signal protection module 22 to prevent the electromagnetic interference signal in the high-voltage and high-current charging circuit from interfering with the signal line of the low-voltage control part.

[0116] The isolation cabin 42 of the battery swap station 1 may also include an internal protection module 12 in the AC protection module 10. Since the first protection module 121 and the second protection module 122 in the internal protection module 12 are both protection modules for the high-voltage circuit, isolation may not be performed between the first protection module 121, the second protection module 122 and the DC charging protection module 21.

[0117] An embodiment of the present application also provides a battery swap station, which may include the electromagnetic protection circuit in the above embodiment.

[0118] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0119] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0120] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the methods and core ideas of this application. The above are only optional implementation methods of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concepts and technical solutions of this application to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An electromagnetic protection circuit, characterized in that: Applied to a power exchange station, the power exchange station includes a power exchange system, the power exchange system is used to convert the alternating current provided by the power grid into direct current, and the electromagnetic protection circuit includes: An AC protection module, wherein the input end of the AC protection module is used to be connected to the power grid, and the output end of the AC protection module is connected to the power exchange system; the AC protection module is used to filter the AC power provided by the power grid; A DC protection module, wherein the input end of the DC protection module is connected to the output end of the battery exchange system, and the output end of the DC protection module is used to connect to the battery pack; the DC protection module is used to filter the charging circuit and signal circuit between the battery exchange system and the battery pack.

2. The electromagnetic protection circuit according to claim 1, characterized in that: The battery replacement system includes a charging module and an AC load; The AC protection module comprises: An external protection module, which is arranged outside the battery swap station, and an input end of the external protection module is used to connect to a power grid; An internal protection module, wherein the internal protection module is disposed inside the battery swap station, an input end of the internal protection module is connected to an output end of the external protection module, and multiple output ends of the internal protection module are respectively connected to the charging module and at least one AC load.

3. The electromagnetic protection circuit according to claim 2, characterized in that: The internal protection module comprises: A first protection module, wherein the first protection module is connected between the external protection module and the charging module; At least one second protection module, wherein the second protection module is connected between the external protection module and a corresponding AC load.

4. The electromagnetic protection circuit according to claim 3, characterized in that: The first protection module comprises: A three-phase common-mode inductor, wherein the three input ends of the three-phase common-mode inductor are respectively connected to the three-phase output ends of the external protection module, and the three output ends of the three-phase common-mode inductor are respectively connected to the three-phase power supply ends of the charging module; Three first differential mode capacitors, wherein first ends of the three first differential mode capacitors are respectively connected to three input ends of the three-phase common mode inductor; Three second differential mode capacitors, wherein first ends of the three second differential mode capacitors are respectively connected to three output ends of the three-phase common mode inductor; Two first common-mode capacitors, one of which is connected between the second ends of the three first differential-mode capacitors and the ground, and the other of which is connected between the second ends of the three second differential-mode capacitors and the ground.

5. The electromagnetic protection circuit according to claim 3, characterized in that: The AC load of the battery swap station is single-phase two-wire power supply; the second protection module includes: Two first differential mode inductors, wherein first ends of the two first differential mode inductors are respectively connected to two AC power supply ends; A first single-phase common-mode inductor, wherein two input ends of the first single-phase common-mode inductor are respectively connected to the second ends of the two first differential-mode inductors, and two output ends of the first single-phase common-mode inductor are connected to the AC load; Three third differential mode capacitors, respectively connected between the first ends of the two first differential mode inductors, between the second ends of the two first differential mode inductors, and between the two output ends of the first single-phase common mode inductor; Two second common-mode capacitors, one of which is connected between one input end of the first single-phase common-mode inductor and the ground end, and the other second common-mode capacitor is connected between the other input end of the first single-phase common-mode inductor and the ground end.

6. The electromagnetic protection circuit according to claim 5, characterized in that: The first differential mode inductor is an amorphous inductor, and the first single-phase common mode inductor is a nanocrystalline common mode inductor.

7. The electromagnetic protection circuit according to claim 2, characterized in that: The DC protection module comprises: A DC charging protection module, which is connected between the charging module and the battery pack and is used to filter the charging circuit between the charging module and the battery pack; A DC signal protection module, the DC signal protection module is connected between the charging module and the battery pack, and is used to filter the signal loop between the charging module and the battery pack; The isolation module is disposed between the DC charging protection module and the DC signal protection module, and is used to isolate the DC charging protection module from the DC signal protection module.

8. The electromagnetic protection circuit according to claim 7, characterized in that: The DC charging protection module includes: A second common-mode inductor, wherein two input ends of the second common-mode inductor are respectively connected to two DC output ends of the charging module, and two output ends of the second common-mode inductor are respectively connected to a positive electrode of the battery pack and a negative electrode of the battery pack; Two fourth differential mode capacitors, respectively connected between the two input ends of the second common mode inductor and between the two output ends of the second common mode inductor; Two third common-mode capacitors, one of which is connected between one output terminal of the second common-mode inductor and the ground terminal, and the other of which is connected between the other output terminal of the second common-mode inductor and the ground terminal.

9. The electromagnetic protection circuit according to claim 8, characterized in that: The two fourth differential mode capacitors and the two third common mode capacitors are withstand voltage DC capacitors, and the withstand voltage value of the withstand voltage DC capacitors is greater than the maximum output voltage of the charging module; the second common mode inductor is a nanocrystalline common mode inductor, and the inner diameter of the nanocrystalline magnetic ring of the nanocrystalline common mode inductor is greater than 50 mm.

10. The electromagnetic protection circuit according to claim 7, characterized in that: The DC signal protection module comprises: Two second differential mode inductors, wherein first ends of the two second differential mode inductors are respectively connected to two signal control ends of the charging module; A third common-mode inductor, wherein two input ends of the third common-mode inductor are respectively connected to the second ends of the two second differential-mode inductors, and two output ends of the third common-mode inductor are connected to the two signal control ends of the battery pack; Three fifth differential mode capacitors, respectively connected between the first ends of the two second differential mode inductors, between the second ends of the two second differential mode inductors, and between the two output ends of the third common mode inductor; Two fourth common-mode capacitors, one of which is connected between one input terminal of the third common-mode inductor and the ground terminal, and the other fourth common-mode capacitor is connected between the other input terminal of the third common-mode inductor and the ground terminal.

11. The electromagnetic protection circuit according to claim 7, characterized in that: The DC charging protection module and the DC signal protection module are arranged in an isolation cabin of the battery swap station, and the isolation module includes a metal plate arranged between the DC charging protection module and the DC signal protection module.

12. A battery swap station, characterized in that: The battery swap station comprises the electromagnetic protection circuit as claimed in any one of claims 1-11.

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