Relay and control method thereof, fully-immersed power module and charging system

Abstract

The invention discloses a relay and a control method thereof, a fully-immersed power module and a charging system, the relay comprises a shell, a to-be-adsorbed piece, a first contact piece, a second contact piece, a main coil, an auxiliary coil and a magnetic pole, and the shell is provided with an output terminal and an input terminal; the to-be-adsorbed piece is connected with the shell and extends in the first direction; the first contact piece is arranged in the shell and located on one side of the piece to be adsorbed. The second contact piece is arranged on the to-be-adsorbed piece; the main coil and the first contact piece are arranged on the same side of the to-be-adsorbed piece so as to adsorb the to-be-adsorbed piece; the auxiliary coil is arranged on one side of the to-be-adsorbed part; the magnetic pole is arranged on the to-be-adsorbed part and corresponds to the auxiliary coil, and the auxiliary coil adsorbs or bounces off the magnetic pole so as to provide additional driving force for the main coil to adsorb or disconnect the to-be-adsorbed part. According to the relay provided by the invention, in the use process, the time consumed for closing or opening the relay is reduced, and the closing or opening of the relay is smoother.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, and particularly relates to a relay, a control method thereof, a fully-immersed power module and a charging system. BACKGROUND

[0002] The relay is an essential device in the power module of an electric vehicle. In a common air-cooled power module, the relay is directly exposed to air, and can be effectively attracted or disconnected by the attraction of a coil magnetic core and the resilience of a spring tab. The temperature change of air does not affect the attraction of the coil magnetic core and the resilience of the spring tab. The relay working in air can control the time consumption of attraction or disconnection in the millisecond level within the temperature range of -45 DEG C to +75 DEG C.

[0003] In a fully-immersed power module, the cooling liquid is usually mineral oil, fluorinated liquid, silicone oil and the like with high insulation and high thermal conductivity. The kinematic viscosity of the cooling liquid is much larger than that of air, and especially under different temperature changes, the kinematic viscosity change can exceed three orders of magnitude. When the relay is completely immersed in the cooling liquid, the resistance of the cooling liquid itself is large, and the time consumption of the relay attraction or disconnection can be increased to tens of milliseconds. Especially at -40 DEG C and below, the time consumption of the relay attraction or disconnection can be increased to hundreds of milliseconds, which seriously affects the time requirement of the power module on fast response, and when the relay attraction or disconnection is not smooth, the reliability of the power module is affected. SUMMARY

[0004] The main purpose of the present application is to provide a relay, a control method thereof, a fully-immersed power module and a charging system, and to solve the problem of long time consumption of relay attraction or disconnection in a fully-immersed power module.

[0005] To achieve the above-mentioned purpose, the present application provides a relay, which comprises a shell, a to-be-attracted accessory, a first contact piece, a second contact piece, a main coil, an auxiliary coil and a magnetic pole. The shell is provided with an output terminal and an input terminal. The to-be-attracted accessory is connected with the shell and extends along a first direction. The first contact piece is arranged in the shell and located on one side of the to-be-attracted accessory. The second contact piece is arranged on the to-be-attracted accessory, wherein the second contact piece is electrically connected with any one of the output terminal and the input terminal, and the first contact piece is electrically connected with the other one of the output terminal and the input terminal. The main coil and the first contact piece are arranged on the same side of the to-be-attracted accessory to attract the to-be-attracted accessory, wherein when the main coil attracts the to-be-attracted accessory, the second contact piece is in contact with the first contact piece and is conducted. The auxiliary coil is arranged on one side of the to-be-attracted accessory. The magnetic pole is arranged on the to-be-attracted accessory and corresponds to the auxiliary coil, wherein the auxiliary coil attracts or repels the magnetic pole to provide additional driving force for the main coil to attract or disconnect the to-be-attracted accessory.

[0006] Optionally, the auxiliary coil and the main coil are located on the same side of the accessory to be attracted and are spaced apart in the first direction; the first contact is located between the auxiliary coil and the main coil; in the first direction, the main coil and the auxiliary coil are located on the side of the connection region of the accessory to be attracted and the shell close to the magnetic pole.

[0007] Optionally, the accessory to be attracted comprises a rotating section, a copper sheet section and a connecting section connected in sequence in the first direction; the rotating section is rotationally connected to the shell, the copper sheet section is correspondingly attracted or disconnected by the main coil; the second contact is arranged at one end of the connecting section away from the copper sheet section; and the magnetic pole is arranged at one end of the second contact away from the connecting section.

[0008] Optionally, the second contact is connected to the end of the accessory to be attracted; the relay further comprises a sliding rail arranged in the shell and a sliding part rotationally connected to one end of the second contact away from the accessory to be attracted and in sliding fit with the sliding rail; in the sliding direction of the sliding part, the magnetic core of the auxiliary coil is axially coincident, and the magnetic pole is arranged at one end of the sliding part facing the auxiliary coil.

[0009] Optionally, the relay further comprises a spring connecting the shell and the accessory to be attracted; in the first direction, the spring is located on the side of the connection region of the accessory to be attracted and the shell away from the magnetic pole; when the main coil attracts the accessory to be attracted, the spring is stretched.

[0010] Optionally, the sliding part has a groove in the outer periphery, the end of the second contact is arranged in the groove and rotationally connected to the sliding part by a pin; the sliding part is made of insulating material.

[0011] In addition, to achieve the above object, the embodiment of the present application further provides a control method of a relay, applied to the relay described above, the method comprising: in response to the attraction control instruction of the relay, applying a positive level signal to the main coil and an attraction control signal to the auxiliary coil to assist the main coil in attracting the accessory to be attracted; or, in response to the disconnection control instruction of the relay, canceling the positive level signal of the main coil and applying a disconnection control signal to the auxiliary coil to assist the main coil in disconnecting the accessory to be attracted.

[0012] Optionally, the adsorption control signal is a positive level signal or a positive pulse signal; if the adsorption control signal is a positive level signal, the positive level signal is cancelled after a preset time interval; the disconnection control signal is a negative level signal or a negative pulse signal; if the disconnection control signal is a negative level signal, the positive level signal is cancelled after a preset time interval.

[0013] In addition, to achieve the above-mentioned purpose, the application further provides a full-immersion power module, which comprises a sealed shell, a PCBA assembly and the above-mentioned relay. The sealed shell has a liquid inlet port and a liquid outlet port. In the direction of gravity, the liquid inlet port is located below the liquid outlet port. The PCBA assembly is arranged in the sealed shell, wherein the PCBA assembly is immersed in the insulating cooling liquid inside the sealed shell. The relay is installed on the PCBA assembly.

[0014] In addition, to achieve the above-mentioned purpose, the application further provides a full-immersion charging system, which comprises at least one charging interface, a power distribution device, at least two full-immersion power modules and a controller. The power distribution device is electrically connected with each charging interface. Each full-immersion power module is electrically connected with the power distribution device. The full-immersion power module is used to convert the alternating current of the power grid into direct current and provide the direct current to the charging interface through the power distribution device. The controller is electrically connected with the power distribution device. The controller is used to obtain the required power of each charging interface and send a scheduling instruction to the power distribution device based on the connection relationship of controllable switches in the power distribution device and each required power. The power distribution device is used to control the opening or closing of the controllable switches in response to the scheduling instruction, so as to distribute the output power of each full-immersion power module to each charging interface.

[0015] The relay provided by the application can be applied to a full-immersion power module. When the relay needs to be turned on, the main coil adsorbs the to-be-adsorbed member, and the auxiliary coil adsorbs or repels the magnetic pole, thereby providing additional driving force for the main coil to adsorb the to-be-adsorbed member, so that the first contact piece and the second contact piece are in contact and turned on, that is, the output terminal and the input terminal are turned on. When the relay needs to be turned off, the main coil disconnects the to-be-adsorbed member, and the auxiliary coil repels or adsorbs the magnetic pole, thereby providing additional driving force for the main coil to disconnect the to-be-adsorbed member, so that the first contact piece and the second contact piece are separated, that is, the output terminal and the input terminal are disconnected. In the process, the auxiliary coil cooperates with the magnetic pole to assist the main coil to adsorb or disconnect the to-be-adsorbed member, thereby greatly improving the resistance of the main coil to adsorb or disconnect the to-be-adsorbed member, reducing the time consumption of the relay to attract or disconnect, and making the relay attract or disconnect more smoothly. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the prior art and the present application, the drawings required to be used in the description of the prior art and the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and other drawings can be obtained by the provided drawings without creative labor for those skilled in the art.

[0017] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0018] Figure 1 A schematic diagram of the internal structure of a relay housing according to an embodiment of the present application is provided. Figure 2 A schematic diagram of the structure of a relay when attracted according to an embodiment of the present application is provided. Figure 3 A schematic diagram of the structure of a sliding part according to an embodiment of the present application is provided. Figure 4 A relay drive waveform diagram according to an embodiment of the present application is provided. Figure 5 A schematic diagram of the internal structure of a full-immersion power module according to an embodiment of the present application is provided. Figure 6 A schematic diagram of a full-immersion charging system according to an embodiment of the present application is provided.

[0019] In the drawings: 1, housing; 11, sliding rail; 12, sliding part; 13, spring; 2, accessory to be attracted; 21, rotating section; 22, copper section; 23, connecting section; 3, first contact; 4, second contact; 5, main coil; 6, auxiliary coil; 7, magnetic pole; 81, sealing shell; 811, liquid inlet port; 812, liquid outlet port; 82, PCBA assembly; 110, full-immersion power module; 120, charging interface; 130, controller; 140, power distribution device.

[0020] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0021] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0022] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, motion condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications also change accordingly.

[0023] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In addition, if the present application has a description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions, for example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0025] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 A schematic diagram of the internal structure of a relay housing is proposed for the embodiments of the present application; Figure 2 A schematic diagram of the structure of a relay when attracted is proposed for the embodiments of the present application; Figure 3 A schematic diagram of the structure of a sliding part is proposed for the embodiments of the present application; Figure 4 A relay drive waveform diagram is proposed for the embodiments of the present application; Figure 5An internal structure diagram of a full-immersion power module is provided for an embodiment of the present application. Figure 6 A full-immersion charging system overall diagram is provided for an embodiment of the present application.

[0027] Reference Figures 1-3 The present application provides a relay, which can include a housing 1, an object to be attracted 2, a first contact 3, a second contact 4, a main coil 5, an auxiliary coil 6, and a magnetic pole 7. The housing 1 is provided with an output terminal and an input terminal. The object to be attracted 2 is connected to the housing 1 and extends in a first direction. The first contact 3 is arranged in the housing 1 and located on one side of the object to be attracted 2. The second contact 4 is arranged on the object to be attracted 2, wherein the second contact 4 is electrically connected to any one of the output terminal and the input terminal, and the first contact 3 is electrically connected to the other one of the output terminal and the input terminal. The main coil 5 and the first contact 3 are arranged on the same side of the object to be attracted 2 to attract the object to be attracted 2, wherein when the main coil 5 attracts the object to be attracted 2, the second contact 4 contacts the first contact 3 and is turned on. The auxiliary coil 6 is arranged on one side of the object to be attracted 2. The magnetic pole 7 is arranged on the object to be attracted 2 and corresponds to the auxiliary coil 6, wherein the auxiliary coil 6 attracts or repels the magnetic pole 7 to provide additional driving force for the main coil 5 to attract or disconnect the object to be attracted 2.

[0028] The relay provided by the present application can be applied to a full-immersion power module. When the relay needs to be turned on, the main coil 5 attracts the object to be attracted 2, and at the same time, the auxiliary coil 6 attracts or repels the magnetic pole 7, thereby providing additional driving force for the main coil 5 to attract the object to be attracted 2, so that the first contact 3 contacts the second contact 4 and is turned on, that is, the output terminal and the input terminal are turned on. When the relay needs to be turned off, the main coil 5 disconnects the object to be attracted 2, and at the same time, the auxiliary coil 6 repels or attracts the magnetic pole 7, thereby providing additional driving force for the main coil 5 to disconnect the object to be attracted 2, so that the first contact 3 is separated from the second contact 4, that is, the output terminal and the input terminal are disconnected. In the use process, the auxiliary coil 6 cooperates with the magnetic pole 7 to assist the main coil 5 to attract or disconnect the object to be attracted 2, which greatly improves the resistance of the main coil 5 to attract or disconnect the object to be attracted 2, thereby reducing the time consumption of the relay to attract or disconnect, and making the relay to attract or disconnect more smoothly.

[0029] It should be noted that the relay has two states of attraction or disconnection. When the relay is attracted, the main coil 5 attracts the object to be attracted 2, the first contact 3 contacts the second contact 4, and the output terminal and the input terminal are turned on. When the relay is disconnected, the main coil 5 disconnects the object to be attracted 2, the first contact 3 is separated from the second contact 4, and the output terminal and the input terminal are disconnected.

[0030] It should be understood that the main coil 5 and the auxiliary coil 6 are both electromagnets formed by winding coils on the outer periphery of a magnetic core. When the main coil 5 is powered, the main coil 5 has a magnetic force, thereby attracting the to-be-attracted accessory 2 to make the to-be-attracted accessory 2 close to and adhere to the magnetic core of the main coil 5, the to-be-attracted accessory 2 drives the second contact 4 to move and make the second contact 4 abut against the first contact 3. When the main coil 5 is powered off, the main coil 5 loses the magnetic force, and the to-be-attracted accessory 2 is away from the main coil 5, and the second contact 4 is separated from the first contact 3.

[0031] The auxiliary coil 6 cooperates with the magnetic pole 7 to provide an additional driving force for the to-be-attracted accessory 2 to approach or be away from the main coil 5, thereby assisting the relay to attract or be disconnected.

[0032] In the embodiment of the application, the first contact 3 can be a copper sheet, and the second contact 4 can be a spring piece.

[0033] Reference Figure 1 The first direction is the X direction, and the shell 1 can adopt a rectangular structure, so the first direction can also be the length direction of the shell 1. The axial directions of the magnetic cores of the main coil 5 and the auxiliary coil 6 can be the same as the width direction of the shell 1, so as to facilitate the to-be-attracted accessory 2 or the magnetic pole 7 to be attracted. The width direction of the shell 1 is referred to as the second direction.

[0034] Further, as shown in Figure 1 and Figure 2 , the side of the magnetic core of the main coil 5 close to the to-be-attracted accessory 2 is provided as an inclined surface, so as to facilitate the to-be-attracted accessory 2 to adhere to the magnetic core of the main coil 5.

[0035] It should be noted that, as shown in Figure 1 , the setting position of the auxiliary coil 6 can be various, taking the connection area of the to-be-attracted accessory 2 and the shell 1 as a reference point, as shown in Figure 1 , the main coil 5, the auxiliary coil 6 and the like are arranged at the lower left corner of the reference point. At this time, the auxiliary coil 6 attracts the magnetic pole 7, which can provide an additional driving force for the main coil 5 to attract the to-be-attracted accessory 2. The auxiliary coil 6 repels the magnetic pole 7, which can provide an additional driving force for the main coil 5 to disconnect the to-be-attracted accessory 2. On this basis, if the auxiliary coil 6 is arranged at the lower right corner of the reference point, at this time, the auxiliary coil 6 attracts the magnetic pole 7, which can provide an additional driving force for the main coil 5 to attract the to-be-attracted accessory 2. The auxiliary coil 6 repels the magnetic pole 7, which can provide an additional driving force for the main coil 5 to attract the to-be-attracted accessory 2. The specific setting position of the auxiliary coil 6 can also be arranged at the upper right corner, the upper left corner and the like of the reference point.

[0036] Reference Figure 1In the preferred embodiment, the auxiliary coil 6 and the main coil 5 are located on the same side of the accessory 2 to be attracted and are spaced apart in the first direction; the first contact 3 is located between the auxiliary coil 6 and the main coil 5; in the first direction, the main coil 5 and the auxiliary coil 6 are located on the side of the connecting area of the accessory 2 to be attracted and the shell 1 close to the magnetic pole 7.

[0037] Specifically, the internal structure of the shell 1 is arranged compactly as a whole, which facilitates saving space and controlling the size of the relay.

[0038] Reference Figure 1 In the exemplary embodiment, the accessory 2 to be attracted can include a rotating section 21, a copper sheet section 22 and a connecting section 23 connected in sequence in the first direction; the rotating section 21 is rotationally connected with the shell 1, the copper sheet section 22 is attracted or disconnected with the main coil 5; the second contact 4 is arranged at one end of the connecting section 23 away from the copper sheet section 22; and the magnetic pole 7 is arranged at one end of the second contact 4 away from the connecting section 23.

[0039] Specifically, when the main coil 5 attracts the copper sheet section 22, the rotating section 21 is driven to rotate, the copper sheet section 22 is attached to the magnetic core of the main coil 5, the connecting section 23 is further driven to rotate synchronously with the second contact 4, and the second contact 4 is attached to the first contact 3. Of course, when the main coil 5 attracts the copper sheet section 22, the auxiliary coil 6 also attracts the magnetic pole 7, thereby assisting the main coil 5 to attract the copper sheet section 22.

[0040] The rotating section 21 and the connecting section 23 are both insulating structures, so as to facilitate the main coil 5 to attract the copper sheet section 22.

[0041] Further, the rotating section 21 can also be an elastic component, so that the rotating section 21 can be directly fixed with the shell 1; when the main coil 5 attracts the copper sheet section 22, the rotating section 21 is deformed; when the main coil 5 disconnects the copper sheet section 22, the rotating section 21 restores the deformation.

[0042] Reference Figures 1-3 In the exemplary embodiment, the second contact 4 is connected to the end of the accessory 2 to be attracted; the relay further includes a sliding rail 11 and a sliding part 12; the sliding rail 11 is arranged in the shell 1; the sliding part 12 is rotationally connected to one end of the second contact 4 away from the accessory 2 to be attracted and is in sliding cooperation with the sliding rail 11; the sliding direction of the sliding part 12 coincides with the axial direction of the magnetic core of the auxiliary coil 6, and the magnetic pole 7 is arranged at one end of the sliding part 12 facing the auxiliary coil 6.

[0043] Specifically, as Figure 3As shown in the embodiment of the present application, the slide rail 11 can be in a block shape with a semicircular slide groove, and the sliding part 12 is in a column shape and is slidably fitted in the slide groove. The axial direction of the sliding part 12 coincides with the axial direction of the magnetic core of the auxiliary coil 6. Thus, when the magnetic pole 7 is arranged at one end of the sliding part 12 close to the auxiliary coil 6, the auxiliary coil 6 can easily attract or repel the magnetic pole 7, and the movement of the attracted accessory 2 is more stable.

[0044] It should be understood that the slide rail 11 can also be a common rail, and the sliding part 12 can be a block-shaped slide block arranged on the slide rail 11. The extension direction of the slide rail 11 is the same as the second direction, so that the auxiliary coil 6 can easily attract or repel the magnetic pole 7 arranged on the slide block.

[0045] It should be noted that, as shown in Figure 1 , the sliding part 12 is rotationally connected to one end of the second contact 4 away from the connecting section 23. Thus, when the auxiliary coil 6 attracts or repels the magnetic pole 7, the relative rotation between the rotating section 21 and the shell 1, and the relative rotation between the second contact 4 and the sliding part 12, occurs.

[0046] In the process of rotating the attracted accessory 2, the rotation angle is small, and in the process of Figures 1-2 , the elongation of the attracted accessory 2 can be borne by the deformation of the reed. Of course, a strip-shaped hole can be arranged on the reed, and the sliding part 12 is rotationally connected to the sliding part 12 through a pin shaft. Thus, the reed can rotate relative to the sliding part 12, or can move relative to the sliding part 12.

[0047] Further, the sliding part 12 has a groove on the outer periphery, and the end of the second contact 4 is arranged in the groove and is rotationally connected to the sliding part 12 through a pin. The sliding part 12 is made of an insulating material.

[0048] It should be noted that the groove can be designed to be large, so that the rotation process of the second contact 4 will not be blocked by the side wall of the groove when the second contact 4 rotates relative to the sliding part 12.

[0049] The sliding part 12 is made of an insulating material, so that the sliding part 12 will not affect the process of attracting or repelling the magnetic pole 7 by the auxiliary coil 6, and the use is more convenient.

[0050] Referring to Figure 1 and Figure 2 , in an exemplary embodiment, the relay can further include a spring 13 connected between the shell 1 and the attracted accessory 2. In the first direction, the spring 13 is located on the side of the connecting region of the attracted accessory 2 and the shell 1 away from the magnetic pole 7. When the main coil 5 attracts the attracted accessory 2, the spring 13 is stretched.

[0051] As shown in Figure 2As shown, the axial direction of the spring 13 can also be the same as the second direction, and the spring 13 and the main coil 5 are arranged on the same side of the to-be-attracted accessory 2, so that when the main coil 5 attracts the copper sheet segment 22 to drive the rotating segment 21 to rotate, the spring 13 is stretched, and then when the main coil 5 is disconnected from the copper sheet segment 22, the spring 13 restores the deformation to drive the rotating segment 21 to rotate, so that the copper sheet segment 22 is away from the main coil 5, that is, the spring 13 can also assist the main coil 5 to disconnect from the to-be-attracted accessory 2, that is, to assist the relay to be disconnected, so that the main coil 5 is disconnected from the copper sheet segment 22, and the second contact 4 and the first contact 3 are separated more quickly and stably in cooperation with the auxiliary coil 6 and the magnetic pole 7.

[0052] Reference Figure 4 Based on the above-mentioned embodiments, the application provides a control method of a relay, which is applied to the above-mentioned relay, and the method can include: in response to an attraction control instruction of the relay, applying a positive level signal to the main coil 5 and applying an attraction control signal to the auxiliary coil 6 to assist the main coil 5 to attract the to-be-attracted accessory 2; or, in response to a disconnection control instruction of the relay, canceling the positive level signal of the main coil 5 and applying a disconnection control signal to the auxiliary coil 6 to assist the main coil 5 to disconnect from the to-be-attracted accessory 2.

[0053] In the exemplary embodiments, the attraction control signal is a positive level signal or a positive pulse signal; if the attraction control signal is a positive level signal, the positive level signal is canceled after a preset time interval; the disconnection control signal is a negative level signal or a negative pulse signal; if the disconnection control signal is a negative level signal, the positive level signal is canceled after a preset time interval.

[0054] Specifically, the method is executed by a control mechanism, such as Figure 4 As shown, from T0 to T3, it is a period, and at T4, the next period cycle starts. At T0, in response to an attraction control instruction of the relay, the control mechanism controls the main coil 5 to be energized to attract the to-be-attracted accessory 2, and at the same time, a positive level is applied to the auxiliary coil 6 to attract the magnetic pole 7, thereby assisting the to-be-attracted accessory 2 to approach the main coil 5, at this time, the second contact 4 is in contact with the first contact 3, and the relay is attracted; at T1, the positive level of the auxiliary coil 6 is released, that is, the auxiliary coil 6 no longer attracts the magnetic pole 7, but the main coil 5 remains energized, and the to-be-attracted accessory 2 is still attracted to the main coil 5, that is, the second contact 4 is still in contact with the first contact 3, and the relay remains attracted; at T2, in response to a disconnection control instruction of the relay, the control mechanism controls the main coil 5 to release the voltage, so that the to-be-attracted accessory 2 is no longer attracted, and at the same time, a negative pulse is applied to the auxiliary coil 6 to repel the magnetic pole 7, so that the to-be-attracted accessory 2 quickly moves away from the main coil 5, the second contact 4 is separated from the first contact 3, and the relay is disconnected; until T4, the next period is entered.

[0055] It should be noted that when the auxiliary coil 6 applies a positive level or a negative level, the positive level or the negative level needs to be released after a preset time.

[0056] Reference Figure 5 On the basis of the above-mentioned embodiments, the full-immersion power module can include a sealed shell 81, a PCBA assembly 82, and the above-mentioned relay. The sealed shell 81 has a liquid inlet port 811 and a liquid outlet port 812. The PCBA assembly 82 is arranged in the sealed shell 81, wherein the PCBA assembly 82 is immersed in the insulating cooling liquid inside the sealed shell 81. The relay is mounted on the PCBA assembly 82.

[0057] Specifically, as shown in Figure 5 , Figure 5 indicates the internal structure of the sealed shell 81, that is, the PCBA assembly 82 should be located inside the sealed shell 81, and the above-mentioned relay is mounted on the PCBA assembly 82. Figure 5 The dashed line in the wave indicates the cooling liquid height inside the sealed shell 81. The low-temperature cooling liquid flows into the full-immersion power module from the liquid inlet port 811 to absorb heat and rise in temperature. The high-temperature cooling oil flows out of the full-immersion power module from the liquid outlet port 812.

[0058] As shown in Figure 5 , in the exemplary embodiments, in the direction of gravity, the liquid inlet port 811 is located below the liquid outlet port 812.

[0059] Specifically, in the direction of gravity, the liquid inlet port 811 is located below the liquid outlet port 812, so that the high-temperature cooling liquid in the full-immersion power module expands and rises and flows out of the liquid outlet port 812, and the flow process is more reasonable and smooth. The cooling liquid at the liquid outlet port 812 will not repeatedly cross the cooling liquid at the liquid inlet port 811, and the heat dissipation effect is better.

[0060] In the exemplary embodiments, temperature detection devices are installed in the liquid inlet port 811 and the liquid outlet port 812, and a temperature detection unit is installed on the PCBA assembly 82.

[0061] Specifically, the temperature detection devices and the temperature detection unit can be temperature sensors or other temperature measurement structures, so as to control the temperature of the low-temperature cooling liquid at the liquid inlet port 811 of the full-immersion power module, the temperature of the high-temperature cooling liquid at the liquid outlet port 812, and the temperature at the PCBA assembly 82, which is more convenient to use.

[0062] In addition, the liquid inlet port 811 and the liquid outlet port 812 can be provided with a backflow prevention structure to prevent the cooling liquid from flowing back. There are many conventional schemes for the backflow prevention structure, which will not be described here.

[0063] Reference Figure 6On the basis of the above-mentioned embodiments, the application provides a full-immersion charging system, which can include at least one charging interface 120, a power distribution device 140, at least two full-immersion power modules 110 described above, and a controller 130. The power distribution device 140 is electrically connected with each charging interface 120. The full-immersion power module 110 is electrically connected with the power distribution device 140. The full-immersion power module 110 is used to convert alternating current of a power grid into direct current and provide the direct current to the charging interface 120 through the power distribution device 140. The controller 130 is electrically connected with the power distribution device 140. The controller 130 is used to obtain required power of each charging interface 120 and send a scheduling instruction to the power distribution device 140 based on a connection relationship of controllable switches in the power distribution device 140 and each required power. The power distribution device 140 is used to control opening or closing of the controllable switches in response to the scheduling instruction to distribute output power of each full-immersion power module 110 to each charging interface 120.

[0064] In an alternative embodiment, the charging system provided by the application is a one-piece direct-current charging pile. The charging interface 120 is used to connect a charging gun. The charging gun is hung on a host of the charging system through a gun seat on a main body of the charging system.

[0065] In an alternative embodiment, the charging system provided by the application is a split-type direct-current charging pile. The charging system further includes a plurality of charging terminals. The charging interface 120 is used to connect the charging terminals. The charging terminals are separately arranged with the main body of the charging system. The charging terminals are configured with a single charging gun or a double charging gun and are used to output power to an electric vehicle.

[0066] The above is only a preferred embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A relay, characterized in that, include: The housing (1) is provided with output terminals and input terminals; The adsorbent (2) is connected to the housing (1) and extends along the first direction; The first contact element (3) is disposed inside the housing (1) and located on one side of the adsorbent element (2); The second contact (4) is disposed on the adsorbent (2), wherein the second contact (4) is electrically connected to either the output terminal or the input terminal, and the first contact (3) is electrically connected to the other of the output terminal or the input terminal. The main coil (5) and the first contact (3) are disposed on the same side of the adsorbent (2) to adsorb the adsorbent (2). When the main coil (5) adsorbs the adsorbent (2), the second contact (4) contacts and conducts with the first contact (3). An auxiliary coil (6) is disposed on one side of the object to be adsorbed (2); A magnetic pole (7) is disposed on the object to be attracted (2) and corresponds to the auxiliary coil (6), wherein the auxiliary coil (6) attracts or repels the magnetic pole (7) to provide additional driving force for the main coil (5) to attract or disconnect the object to be attracted (2).

2. The relay as described in claim 1, characterized in that, The auxiliary coil (6) and the main coil (5) are located on the same side of the adsorbent (2) and are spaced apart in the first direction; The first contact (3) is located between the auxiliary coil (6) and the main coil (5); In the first direction, the main coil (5) and the auxiliary coil (6) are both located on the side of the connection area between the adsorbed part (2) and the housing (1) near the magnetic pole (7).

3. The relay as described in claim 2, characterized in that, The adsorbent component (2) includes a rotating section (21), a copper sheet section (22), and a connecting section (23) connected in sequence in the first direction. The rotating section (21) is rotatably connected to the housing (1), and the copper strip section (22) is either attracted to or disconnected from the main coil (5). The second contact (4) is disposed at the end of the connecting segment (23) away from the copper foil segment (22); The magnetic pole (7) is located at the end of the second contact (4) away from the connecting segment (23).

4. The relay as described in claim 1, characterized in that, The second contact (4) is connected to the end of the element to be adsorbed (2); the relay further includes: A slide rail (11) is disposed inside the housing (1); The sliding part (12) is rotatably connected to the end of the second contact member (4) away from the adsorbent member (2) and slides in cooperation with the slide rail (11); The sliding direction of the sliding part (12) coincides with the magnetic core axis of the auxiliary coil (6), and the magnetic pole (7) is disposed at the end of the sliding part (12) facing the auxiliary coil (6).

5. The relay as described in claim 2, characterized in that, The relay also includes: Spring (13) connects the housing (1) and the adsorbent (2); In the first direction, the spring (13) is located on the side of the connection area between the adsorbed part (2) and the housing (1) away from the magnetic pole (7); When the main coil (5) attracts the object to be attracted (2), the spring (13) is stretched.

6. The relay as described in claim 4, characterized in that, The sliding part (12) has a groove on its outer periphery, and the end of the second contact member (4) passes through the groove and is rotatably connected to the sliding part (12) by a pin; The sliding part (12) is made of insulating material.

7. A method for controlling a relay, characterized in that, The method, applied to the relay according to any one of claims 1 to 6, comprises: In response to the relay's engagement control command, a positive level signal is applied to the main coil (5), and an adsorption control signal is applied to the auxiliary coil (6) to assist the main coil (5) in adsorbing the object to be adsorbed (2); or, In response to the disconnection control command of the relay, the positive level signal of the main coil (5) is canceled, and a disconnection control signal is applied to the auxiliary coil (6) to assist the main coil (5) in disconnecting the adsorbed element (2).

8. The relay control method as described in claim 7, characterized in that, The adsorption control signal is a positive level signal or a positive pulse signal; If the adsorption control signal is a positive level signal, the positive level signal is canceled after a preset time interval; The disconnection control signal is a negative level signal or a negative pulse signal; If the disconnection control signal is a negative level signal, the positive level signal will be canceled after a preset time interval.

9. A fully immersion power module, characterized in that, include: The sealed housing (81) has an inlet port (811) and an outlet port (812), wherein, in the direction of gravity, the inlet port (811) is located below the outlet port (812); PCBA assembly (82) is disposed within the sealed housing (81), wherein the PCBA assembly (82) is immersed in an insulating coolant inside the sealed housing (81); The relay as described in any one of claims 1 to 6 is mounted on the PCBA assembly (82).

10. A fully immersion charging system, characterized in that, include: At least one charging port (120); The power distribution device (140) is electrically connected to each of the charging interfaces (120); At least two fully immersion power modules (110) as described in claim 9 are electrically connected to the power distribution device (140), the fully immersion power modules (110) being used to convert AC power from the power grid into DC power and provide it to the charging interface (120) through the power distribution device (140). A controller (130) is electrically connected to the power distribution device (140). The controller (130) is used to obtain the required power of each of the charging interfaces (120) and send a scheduling command to the power distribution device (140) based on the connection relationship of the controllable switches in the power distribution device (140) and the required power of each interface. The power distribution device (140) is used to control the opening or closing of the controllable switches in response to the scheduling command, so as to distribute the output power of each of the fully immersive power modules (110) to each of the charging interfaces (120).

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