Contact device and break device

Abstract

The contact device and the detonation circuit breaker provided by the present disclosure relate to the technical field of circuit breakers. The contact device comprises a contact body, a grid is provided side by side on the contact body, and an explosion shell is arranged on the side of the contact body opposite to the grid; a metal grid sheet is matched with the grid, and the contact body provides clamping force for the metal grid sheet; an explosion part is arranged in the explosion shell, and the explosion part is configured to provide a pushing force for the contact device after explosion. The contact device provided by the present disclosure has the following advantages: a plurality of metal grid sheets are clamped on a plurality of grids by arranging the grids in the device; when a current fault occurs in a circuit and needs to be cut off, the explosion part of the contact device is exploded to push the metal grid sheets to cut off the busbar in the circuit; meanwhile, the plurality of metal grid sheets can cut off the electric arc generated when the busbar is cut off, thereby achieving the effect of arc extinguishing; the contact device integrates the functions of cutting off the busbar and extinguishing the arc, and has a compact structure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of circuit breakers, and in particular, to a contact device and an explosion-type circuit breaker. BACKGROUND

[0002] Battery packs have been widely used in various industries due to their environmental friendliness and other characteristics, and especially as the main energy storage of electric vehicles, have become the mainstream trend in the automotive power industry. However, due to the high-voltage characteristics of the battery pack itself, in order to ensure the safety of the battery pack during use in the power supply system, an overvoltage protection is usually set, and when the voltage is too large, the circuit is cut off to ensure the safety of the entire system.

[0003] In the power supply system of an electric vehicle, a structure of a high-voltage relay configured with a fuse is usually used as an overvoltage protection device, but such a device has a long fuse melting time when a current fault occurs, and a long electric arc is generated in the instant of power failure, which can cause damage to the vehicle equipment.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present disclosure is to overcome the shortcomings of the prior art, and to provide a contact device and an explosion-type circuit breaker.

[0006] Other characteristics and advantages of the present disclosure will become apparent from the following detailed description, or will be learned by practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a contact device is provided, which comprises:

[0008] a contact body, the contact body being provided with a grid in parallel on one side of the contact body, and an explosion shell being provided on the side of the contact body opposite to the grid;

[0009] a metal grid sheet, the metal grid sheet being matched with the grid, and the contact body providing a clamping force for the metal grid sheet;

[0010] an explosion part, the explosion part being provided in the explosion shell, and the explosion part being configured to provide a thrust for the contact device after explosion.

[0011] In some embodiments of the present disclosure, based on the foregoing scheme, the number of the grids is the same as the number of the metal grid sheets.

[0012] In some embodiments of the present disclosure, based on the foregoing scheme, the metal grid sheet is configured to protrude from the contact body on the side away from the grid.

[0013] In some embodiments of the present disclosure, based on the foregoing scheme, the metal grid is provided with a groove.

[0014] In some embodiments of the present disclosure, based on the foregoing scheme, the opening direction of the groove is away from the side of the detonation part.

[0015] In some embodiments of the present disclosure, based on the foregoing scheme, the groove is a U-shaped groove.

[0016] According to another aspect of the present disclosure, a detonation type circuit breaker is provided, which comprises:

[0017] a housing, the housing comprising a first housing and a second housing;

[0018] a busbar, the busbar being arranged at the connection of the first housing and the second housing, the busbar being provided with a cut-off opening, the busbar being configured to conduct electricity in any direction through the detonation type circuit breaker;

[0019] a contact device, the contact device being arranged in the first housing, the contact device comprising a contact body, a metal grid and a detonation part, the contact body being provided with a grid cooperating with the metal grid, the detonation part being arranged on the side opposite to the grid of the contact body.

[0020] In some embodiments of the present disclosure, based on the foregoing scheme, the detonation type circuit breaker further comprises a lifting part, the lifting part being arranged in the second housing, the lifting part being configured to allow the busbar to swing into the second housing when cut off.

[0021] In some embodiments of the present disclosure, based on the foregoing scheme, the metal grid is configured to protrude from the contact body on the side away from the grid for cutting off the busbar.

[0022] In some embodiments of the present disclosure, based on the foregoing scheme, the metal grid is provided with a U-shaped groove in the direction facing the busbar.

[0023] The contact device provided by the present disclosure, on the one hand, by arranging a side-by-side grid structure in the contact device, the structure can provide a mounting position for the metal grid, the metal grid is clamped in the contact device by the clamping force of the grid, when the circuit needs to be cut off, the metal grid is pushed to cut off the circuit by the detonation part in the detonation device, the metal grid cuts off the circuit in a short time and at a high speed.

[0024] In the second aspect, since the contact device has a plurality of metal grids arranged side by side, the arc generated when the circuit is cut off can enter the plurality of metal grids, and the long arc is cut into a plurality of short arcs, so that the arc extinguishing function is achieved, and the safety of the circuit is ensured.

[0025] In the third aspect, the plurality of metal grids in the contact device can capture the arc generated at the moment of arc generation, so that the purpose of timely arc extinguishing is achieved, and the position and form of arc generation are not limited.

[0026] In another aspect, the disclosure also provides an explosive circuit breaker. When the circuit breaker needs to be disconnected, the explosive part in the contact device is exploded to provide a thrust force for the metal grids arranged in the contact device, so as to cut the fracture of the bus bar, and the metal grids can timely capture the arc generated due to the fracture of the bus bar, and cut the long arc into a plurality of short arcs, so as to achieve the effect of arc extinguishing. The explosive circuit breaker has a short circuit cutting time, can effectively and quickly extinguish the arc, and has high safety.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings incorporated into the specification and forming a part of the specification, show embodiments consistent with the disclosure, and together with the specification, serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the disclosure, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0029] Figure 1 The structure of a contact device in an exemplary embodiment of the disclosure is shown in the structure diagram.

[0030] Figure 2 The structure of a contact device in an exemplary embodiment of the disclosure is shown in the structure side view.

[0031] Figure 3 The arrangement of the grid in a contact device in an exemplary embodiment of the disclosure is shown in the arrangement diagram.

[0032] Figure 4 The structure of a metal grid in a contact device in an exemplary embodiment of the disclosure is shown in the structure diagram.

[0033] Figure 5 The cross-sectional view of an explosive circuit breaker in an exemplary embodiment of the disclosure is shown in the cross-sectional view.

[0034] Figure 6An outline view of an explosive circuit breaker according to one of the exemplary embodiments of the present disclosure.

[0035] In the drawings:

[0036] 1: contact device; 11: contact body; 111: grid; 112: foot; 12: metal grid; 121: groove; 122: protrusion; 123: head; 13: explosive portion; 131: explosive housing; 132: lead wire; 2: housing; 21: first housing; 22: second housing; 3: busbar; 31: cutout; 32: bent portion; 4: lifting portion. DETAILED DESCRIPTION

[0037] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, these embodiments should not be construed as limiting the present disclosure, but merely as illustrating the principles of the exemplary embodiments. The example embodiments can be implemented in various forms and should not be construed as limited to the implementations set forth herein; rather, these embodiments are provided as a full and enabling disclosure of the example embodiments, and to fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views of the drawings, and terms of description can be used for the purposes of describing particular embodiments but are not intended to limit the scope of the example embodiments. In addition, the drawings are only schematic and the dimensions are chosen for the clarity of presentation and are not necessarily drawn to scale.

[0038] A circuit breaker can be applied in various circuits as a protection device, which can selectively interrupt the current flowing out of or into an energy storage device, because it can break the circuit in a shorter time than a fuse and has the ability to actively shut down the circuit, so in high-voltage circuits, a high-voltage relay is usually equipped with a circuit breaker. For example, a battery pack is used as an energy storage device for electric vehicles or other equipment, and a circuit breaker is usually provided in the battery pack to ensure the safety of the battery pack during operation. Cutting off a large current in a circuit can generate an arc, and the circuit breaker is provided to ensure the safety of the circuit, but the generation of an arc can cause further damage risk, so reducing the harm of the arc is also one of the necessary functions of the circuit breaker.

[0039] The explosive circuit breaker provided by the present disclosure can be used to interrupt the current in various embodiments, and the explosive circuit breaker is designed to cut off the electrical connection between an energy storage device (such as a battery pack) and another component (such as a motor or a power electronic circuit), and the explosive circuit breaker can be positioned inside or outside the package, in either case, the circuit can be equipped with the explosive circuit breaker of the present disclosure to ensure the safety of the circuit.

[0040] In embodiments of this disclosure, the terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion meaning and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as labels and are not a limitation on the number of objects.

[0041] This disclosure provides a contact device, such as... Figure 1 As shown, the contact device 1 includes: a contact body 11, a metal grid 12, and an detonation part 13.

[0042] The contact body 11 has a grid 111 arranged side by side, and a detonation shell 131 is provided on the side of the contact body 11 opposite to the grid 111; the metal grid 12 cooperates with the grid 111 provided on the contact body 11, and the contact body 11 provides clamping force for the metal grid 12; the detonation part 13 is provided in the detonation shell 131 provided on the contact body 11, and the detonation part is configured to allow detonation to provide thrust for the contact device 1.

[0043] Combination Figure 1 and Figure 2 In the contact device 1 provided in this disclosure, a plurality of grids 111 are arranged in parallel at one end of the contact body 11. The grids 111 are clamping positions for the metal grid pieces 12, that is, one end of the metal grid pieces 12 is clamped inside the grids 111. Therefore, the grids 111 need to have a shape and size that matches the metal grid pieces. For example, if the clamping end of the metal grid pieces 12 is flat, then the grids 111 need to be grooves that can accommodate the flat structure, just like the metal grid pieces 12. The size of the grooves in the grids 111 needs to be slightly smaller than or equal to the size of the metal grid pieces 12, so as to ensure that after the grids 111 and the metal grid pieces 12 are engaged, the grids 111 can provide sufficient clamping force for the metal grid pieces 12, and ensure that the metal grid pieces 12 are clamped on the contact body 11 and will not fall off during the operation of the metal grid pieces 12.

[0044] In this disclosure, the contact body 11 has a "Π" shaped structure, such as Figure 1 As shown, the contact body 11 has four feet 112 on the surface for mounting the metal grid 12. The four feet 112 are located at the four corners of the end face of the contact body 11. The feet 112 can be cubic columns or other cylindrical structures. The arrangement of the four feet 112 provides protection for the metal grid 12 mounted on the contact body 11, preventing the metal grid 12 from being misaligned in the working direction (e.g., ...). Figure 1The foot 112 is preferably integrally formed on the contact body 11, and in some embodiments, the foot 112 and the contact body 11 can also be separately manufactured and then connected, which can be selected according to specific needs.

[0045] In the present disclosure, the number of the metal strips 12 is the same as the number of the grids 111, and the metal strips 12 are configured to protrude from the contact body 11 on the side away from the grids 111, that is, the length of the head 123 of the metal strip is greater than the length of the foot 112 of the contact body 11, and the length of each metal strip 12 protruding from the contact body 11 is not the same, and the length of the metal strip 12 located in the middle portion is greater than the length of the metal strip 12 located on both sides, that is, the arrangement shape of the head 123 of the metal strip 12 can be in a U-like shape.

[0046] In the application of the contact device 1, the contact device 1 is usually assembled in a circuit breaker, and when the current in the circuit breaker needs to be cut off, the bus bar in the circuit breaker is cut off by the contact device to cut off the current, and the main structure for cutting off the bus bar in the contact device 1 is the head 123 of the metal strip 12, which is arranged in a U-like shape as described above. When the bus bar is cut off, the longest metal strip 12 faces the cut-off port on the bus bar, so that the thrust on the metal strip 12 acts on the cut-off port of the bus bar to the greatest extent, thereby ensuring the effective cutting of the cut-off port.

[0047] The metal strip 12 is also provided with a groove 121, the opening direction of the groove 121 is away from the side of the detonation portion 13, and the groove 121 is a U-like groove, which is a groove structure symmetrical on both sides of the center line of the metal strip 12. A plurality of metal strips 12 are arranged side by side in the contact device 1, and when the contact device is applied to the circuit breaker, the plurality of metal strips 12 are designed to suppress the formation of an arc when the bus bar in the circuit breaker is cut off by the contact device. For example, the arc generated at the moment when the bus bar is cut off can be quickly captured by the metal strip 12, and at the same time, the plurality of metal strips 12 cut the captured arc into a plurality of short arcs to achieve the purpose of arc extinguishing. In addition, since the metal strip 12 can move along the vertical direction of the circuit breaker perpendicular to the bus bar, the arc in the circuit breaker can be captured and switched during the movement of the metal strip 12, so that the arc is divided into smaller arcs with smaller voltage, which is not limited to the position and form of the arc, and further achieves the purpose of arc extinguishing.

[0048] The metal grid 12 can be made of any metal-containing material, including but not limited to steel, copper and other metals. In some embodiments, more or fewer grid plates than in the present example can be used, the size of the metal grid 12 and the spacing (one or more) between them can be selected according to the specific embodiment, for example, based on the overall size of the circuit breaker and the expected level of system induction, voltage and / or current of the circuit system, etc.

[0049] In some embodiments, the metal grid 12 can be flat, with a groove 121 at one end and a flat structure at the other end (shown in FIG. 1). Figure 1 In some embodiments, the metal grid 12 can be flat, with a groove 121 at one end and a flat structure at the other end (shown in FIG. 1). Figure 4 For example, the metal grid 12 has two protrusions 122 at one end, the top surface of the protrusion 122 is parallel to the end surface of the metal grid 12, and the thickness of the protrusion 122 can be the same as or different from the thickness of the metal grid 12. If the thickness of the protrusion 122 is the same as the thickness of the metal grid 12, the width of the grid 111 needs to be the same as the thickness of the metal grid 12. If the thickness of the protrusion 122 is different from the thickness of the metal grid 12, the width of the grid 111 needs to be the same as the thickness of the protrusion 122 to ensure that the protrusion 122 can effectively cooperate with the grid 111. In some embodiments, the protrusion 122 can also have different regular or irregular shapes, which can be designed according to actual needs. In some embodiments, the protrusion 122 can be integrally formed with the metal grid 12 by injection molding, or can be separately manufactured and connected, such as welding or brazing, including but not limited to the above specific connection methods.

[0050] In some embodiments, the grid 111 on the contact body 11 can be a through slot from the left side to the right side of the contact body 11 (from the bottom view of the contact body 11), and the metal grid 12 can be fixed in the grid 111 by insertion. In addition, the grid 111 can also be an array of multiple grooves arranged on the contact body 11, as shown in FIG. 3. Figure 3 In some embodiments, the grid 111 on the contact body 11 can be a through slot from the left side to the right side of the contact body 11 (from the bottom view of the contact body 11), and the metal grid 12 can be fixed in the grid 111 by insertion. In addition, the grid 111 can also be an array of multiple grooves arranged on the contact body 11, as shown in FIG. 3. Figure 4As shown, each protrusion 122 is matched with a grid 111, and the plurality of protrusions 122 and the plurality of grids 111 are the same in size and arrangement array, so as to ensure that the metal grid 12 can be inserted into the grid 111 through the protrusion 122 and fixed on the contact body 11. It should be noted that the number of the plurality of protrusions 122 on the metal grid 12 needs to meet the working strength requirement of the metal grid 12, so as to ensure the thrust of the metal grid 12 while preventing the protrusion 122 from being broken from the metal grid 12.

[0051] Since the metal grid 12 is connected to the grid 111 on the contact body 11 in an insertion manner, when the metal grid 12 is damaged, the damaged metal grid 12 can be removed and replaced with a new metal grid 12, which is conducive to the maintenance of the metal grid 12.

[0052] On the contact body 11, an explosion shell 131 is arranged at one end relative to the grid 111, and the explosion shell 131 is configured to accommodate the fixation of the detonating part 13. Since the detonating part 13 needs to provide the metal grid 12 with a thrust along the axial direction of the metal grid 12 after detonation, the detonating part 13 is arranged in the explosion shell 131, and the detonating part 13 is wrapped in the explosion shell 131, the explosion shell 131 limits the detonating part 13 in the circumferential direction, so that the explosion force of the detonating part 13 after detonation is concentrated to provide the thrust for the metal grid 12. Therefore, the explosion shell 131 not only provides a mounting position for the detonating part 13, but also limits the detonating part 13 to concentrate the thrust for the metal grid 12. In addition, the explosion shell 131 can also protect other structures in the contact device 1 from the explosion of the detonating part 13.

[0053] In some embodiments, the structure of the explosion shell 131 can be a cylindrical structure, one end of the explosion shell 131 is connected to one end face of the contact body 11, and the cavity structure inside the explosion shell 131 provides a mounting position for the detonating part 13. In addition, the explosion shell 131 can also be a cubic structure or other structure with a cavity. The shape of the explosion shell 131 can be selected according to the specific shape of the detonating part 13. For example, when the detonating part 13 is a cylindrical explosive, the explosion shell 131 can be set as a cylindrical structure, so that the shape of the explosion shell 131 is more suitable for the detonating part 13. However, the present disclosure is not necessarily limited to the same shape of the explosion shell 131 and the detonating part 13. Considering the need in the processing process and the actual assembly process, appropriate selection can be made.

[0054] The material of the detonation shell 131 can be a plastic shell made of polyvinyl chloride, ABS (acrylonitrile-butadiene-styrene copolymer) and the like, but the use of a plastic shell requires that the strength of the shell meet the limit requirements of the detonation part 13; the detonation shell 131 can also be a metal material, such as a copper shell or an aluminum shell, etc. In the present disclosure, the detonation shell 131 can be manufactured in one piece with the contact body 11, or the detonation shell 131 can be separately manufactured and then assembled with the contact body 11. It should be noted that the connection part of the detonation shell 131 and the contact body 11 needs to meet the working strength requirements of the contact device 1, and after the detonation of the detonation part 13, the detonation shell 131 and the contact body 11 will not separate.

[0055] In the present disclosure, the detonation part 13 is arranged in the detonation shell 131, and the detonation part 13 is configured to provide a pushing force to the contact device after detonation. The inside of the detonation part 13 can be filled with one or more of any detonation fuel, and the detonation part 13 also has a lead wire 132 coupled to the fuel in the detonation part 13. The lead wire 132 is configured to receive an electric current signal and allow ignition to detonate the detonation part 13. In some embodiments, the lead wire 132 can terminate at the corresponding end of the bridge wire in the detonation fuel in the detonation part 13. The lead wire 132 includes a detonation generator which is used to apply a voltage between the lead wires to drive a current through the bridge wire and cause it to melt. The heat generated after melting is used to detonate the detonation fuel in the detonation part 13.

[0056] The detonation fuel has a corresponding one or more chemical components, and the specific type can be selected according to the performance required for cutting the busbar. The function of the detonation fuel is to generate a pushing force after explosion to push the metal grid 12 to cut and open the busbar in the circuit breaker. In some embodiments, the detonation fuel includes an initiator fuel, for example, the detonation fuel can be a very fast burning fuel to quickly generate an explosion force to push the metal grid 12 to cut the busbar. It has a chemical reaction that basically only produces solid output and does not produce gas. The energy of such fuel basically comes from heat energy. In some embodiments, a fast-burning boron-containing material can be used, including but not limited to one or a combination of zirconium perchlorate, tungsten zirconium perchlorate, zirconium perchlorate, titanium potassium perchlorate, or hydrogen potassium perchlorate.

[0057] The contact device provided by the present disclosure has a plurality of metal grids with grooves clamped in the grid arranged side by side in the contact body part of the contact device. During the operation of the contact device, the metal grid is pushed to move by detonating the detonation part, and the metal grid can cut off the fault current in the circuit and extinguish the arc generated after cutting off the current by the plurality of metal grids to achieve the purpose of rapid arc extinction and ensure the safety of the circuit system. Such a contact device is suitable for various voltage circuits, especially high voltage circuit systems.

[0058] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0059] This disclosure also provides an explosive circuit breaker, such as... Figure 5 As shown, combined with Figures 1-4 The circuit breaker includes: a contact assembly 1, a housing 2, a busbar 3, and a support 4.

[0060] The housing 2 includes a first housing 21 and a second housing 22, as follows: Figure 5 As shown, the first housing 21 is disposed above the second housing 22. The cross-section of the structure formed by the connection of the first housing 21 and the second housing 22 is a U-shaped structure, and the housing 2 is a rectangular body with a cavity structure composed of the first housing 21 and the second housing 22. The housing 2 can be made of electrically insulating materials, such as plastics made of polyvinyl chloride, ABS (acrylonitrile-butadiene-styrene copolymer), etc. The first housing 21 and the second housing 22 can be manufactured by injection molding.

[0061] In other embodiments, the housing 2 includes, but is not limited to, a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 may be integrally formed or may be formed by connecting multiple parts. For example, the first housing 21 may also be formed by connecting multiple different parts. The composition of the housing 2 can be selected according to actual production needs, and the housing 2 may have different numbers of components. The number and types of components may be increased or decreased according to the actual application scenario of the circuit breaker, including but not limited to the components provided herein.

[0062] The housing 2 also includes a clamping part (not shown in the figure), which includes at least two clamping components for clamping the busbar 3 so that the busbar 3 is fixedly connected to the housing 2. Specifically, the clamping part can be respectively provided on the first housing 21 and the second housing 22, and the first housing 21, the busbar 3 and the second housing 22 are clamped and fixed in a "sandwich" structure. The clamping part must meet the force requirements during the operation of the circuit breaker.

[0063] The contact device 1 is arranged in the first housing 21, the contact device 1 is wrapped in the first housing 21, and the first housing 21 is provided with a lead 132 outlet, and the number of outlets corresponds to the number of leads 132. The lead 132 is led out of the outlet to be connected with the signal sending device in the circuit to receive the circuit fault signal and the like to complete the detonation of the detonation part 13; the contact device 1 comprises a contact body 11, a metal grid 12 and a detonation part 13, the metal grid 12 is arranged on the side away from the grid 111 and protrudes from the contact body 11, the metal grid 12 is used to cut off the busbar 3, and the metal grid 12 is provided with a U-shaped groove 121 (as shown in Figure 1 The specific structure of the contact device 1 is as described above, and will not be described here.

[0064] The busbar 3 is arranged at the connection of the first housing 21 and the second housing 22, and the busbar 3 is provided with a cutting port 31, and the busbar 3 is arranged to conduct electricity in any direction through the detonation circuit breaker.

[0065] The busbar 3 is arranged at the connection of the first housing 21 and the second housing 22, and the busbar 3 is provided with a cutting port 31, and the busbar 3 is arranged to conduct electricity in any direction through the detonation circuit breaker. Figure 5 As shown in Figure 5 The cutting port 31 is located on the lower surface of the busbar 3.

[0066] The cutting port 31 on the lower surface of the busbar 3 can be a V-shaped structure, and the opening of the V-shaped structure faces the direction of the second housing 22. In addition, the cutting port 31 can also be a U-shaped and other structure of the groove type structure. The groove type structure of the cutting port 31 needs to meet the needs of the current-carrying function of the busbar 3, and the cutting port 31 needs to meet the quick disconnection under the stress condition. Preferably, the V-shaped structure is selected in the present disclosure; the cutting port 31 can be a weak point of the busbar 3 formed by brazing, copper brazing or welding joint and the like. By impacting the cutting port 31 on the busbar 3 through the head 123 of the metal grid 12 in the contact device 1, the current in the busbar 3 can be quickly interrupted.

[0067] The busbar 3 is arranged to conduct electricity in any direction through the detonation circuit breaker, so the busbar 3 needs to be made of conductive material. In the present disclosure, the busbar 3 can be made of copper or aluminum, or other materials with conductive properties. The busbar 3 can be made of one or more conductive materials. In order to facilitate the depiction of the cutting port 31 in the busbar 3, it is preferred to use a conductive plate made of an entire conductive material.

[0068] In the embodiments of the present disclosure, the bending portion 32 is further arranged on the busbar 3, and the bending portion 32 is configured to allow the busbar 3 to swing into the second housing 22 when cut off. The bending portion 32 is arranged on the surface of the busbar 3 facing the first housing 21. After the busbar 3 is cut along the cut-off port 31, the busbar 3 will bend in the direction from the first housing 21 to the second housing 22 due to the impact force. The bending portion 32 serves as a rotation fulcrum, which can ensure that the cut-off busbar 3 will not fall off.

[0069] In some embodiments, the bending portion 32 can be a groove structure, specifically a V-shaped groove structure or a rectangular groove, and the opening direction is toward the first housing 21. The opening depth of the bending portion 32 on the busbar 3 can be set according to the working strength of the busbar 3, and it is required to ensure that the bending portion 32 will not be broken when the busbar 3 is subjected to an impact force. Specifically, when the busbar 3 is provided with a cut-off port 31, the corresponding busbar 3 should have two bending portions 32.

[0070] The lifting portion 4 is arranged in the second housing 22, specifically, the lifting portion 4 is wrapped in the second housing 22. Specifically, the bottom surface of the lifting portion 4 is in contact with the bottom surface inside the second housing 22, and the outer side surface of the lifting portion 4 is in contact with the inner side surface of the second housing 22, so that the second housing 22 can provide sufficient support force for the lifting portion 4. The lifting portion 4 is configured to allow the busbar 3 to swing into the second housing 22 when cut off. The lifting portion 4 is arranged in a U-shaped structure, the two ends of the lifting portion 4 are higher than the middle part, and the two ends are located outside the bending portion 32 on the busbar 3 and close to the second housing 22. The lifting portion 4 is used to lift the busbar 3, so that the busbar 3 will not break and fall into the second housing 22 after being cut off. The lifting portion 4 ensures that the busbar 3 rotates along the bending portion 32 into the second housing 22 after being cut off, and provides support force for the busbar 3.

[0071] In specific embodiments, when the circuit breaker receives a fault signal, the fuse 132 is detonated to detonate the detonation portion 13, which provides a pushing force facing the busbar 3 for the contact device 1. The head 123 of the metal grid 12 in the contact device 1 impacts the cut-off port 31 on the busbar 3, so that the busbar 3 is broken from the cut-off port 31. The busbar 3 is bent from the bending portion 32 into the second housing 22. The long electric arc generated by the breaking of the busbar 3 is captured by the metal grid 12 and enters the metal grid 12. The long electric arc with high voltage is cut into multiple short electric arcs with low voltage by the metal grid 12, so as to achieve the purpose of arc extinguishing.

[0072] The disclosed explosion type circuit breaker cuts off the cut-off port on the busbar through the metal blades in the contact device to cut off the current in the circuit breaker, while the multiple metal blades in the contact device capture the arc generated when the busbar is broken and cut the arc into multiple short arcs to achieve the purpose of arc extinguishing. The disclosed explosion type circuit breaker has the dual functions of cutting off the busbar and extinguishing the arc, and has a simple structure and is easy to maintain.

[0073] The following will be described in combination with Figures 1 to 6 The specific embodiments of the disclosure will be described:

[0074] The use of the explosion type circuit breaker in an electric vehicle will be described as an example. In an electric vehicle, the battery pack is the main source of power, and the probability of circuit failure is relatively high. To ensure the safety of the battery pack, a high-voltage relay and a circuit breaker are usually connected to the circuit where the battery pack is located. The explosion type circuit breaker is used in this embodiment. The busbar in the relay is connected in the circuit to turn on the circuit.

[0075] When the battery pack circuit fails (such as a current fault), the circuit sends a signal to the circuit breaker, and the fault current causes the explosion part 13 in the circuit breaker to explode. Under the action of the explosion force generated by the explosion part 13, the explosion part pushes the contact device 1 to move quickly in a direction perpendicular to the busbar 3. The head 123 of the metal blade 12 of the contact device 1 quickly and accurately cuts off the cut-off port 31 provided on the busbar 3 to cut off the current supply in the circuit. At the same time, the multiple metal blades 12 quickly capture the arc generated when the busbar 3 is broken and cut the arc into multiple short arcs to achieve the purpose of arc extinguishing.

[0076] The time for the disclosed explosion type circuit breaker to cut off the circuit is about 2 ms (milliseconds), while the time for the fuse to cut off the circuit is about 30 ms (milliseconds). Compared with the fuse cutting method, the efficiency of the disclosed explosion type circuit breaker for cutting off the circuit is greatly improved, further improving the safety of the electric vehicle. The disclosed explosion type circuit breaker cuts off the busbar and captures the arc through the multiple metal blades in the contact device, which can quickly extinguish the arc and is not limited to the position and form of the arc generated, avoiding the hazards such as vehicle self-ignition caused by the arc generated by the cut-off.

[0077] Other embodiments of the disclosure will be readily apparent to those skilled in the art upon considering the specification and practicing the disclosure disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the disclosure that follow the general principles of the disclosure and include known or customary practices in the art to which the disclosure pertains. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the disclosure are indicated by the appended claims.

Claims

1. A contact device, characterized in that The application relates to an explosion type circuit breaker. The contact body is provided with a grid on one side, and an explosion shell is arranged on the side opposite to the grid. The metal grid is matched with the grid, and the contact body provides clamping force for the metal grid. The metal grid is configured to protrude from the contact body on the side away from the grid.

2. The contact device of claim 1, wherein The length of each metal grid protruding from the contact body is different.

3. The contact device of claim 1, wherein, The length of the metal grid at the middle part is greater than that of the metal grid at the two ends.

4. The contact device of claim 3, wherein, The metal grid can move in a direction perpendicular to the bus bar.

5. The contact device of claim 4, wherein, The metal grid can capture and cut off an arc when the metal grid moves.

6. An explosive circuit breaker characterized by, The explosion part is arranged in the explosion shell. The explosion part is configured to provide thrust for the contact device after explosion. The number of the grids is the same as that of the metal grids. The metal grid is provided with a groove. The opening direction of the groove is away from the explosion part.

7. The break-free circuit breaker of claim 6, wherein, The groove is a U-shaped groove.

8. The breakaway circuit breaker of claim 6, wherein, The application relates to an explosion type circuit breaker. The shell comprises a first shell and a second shell. The bus bar is arranged at the connection of the first shell and the second shell. The bus bar is provided with a cutting port. The bus bar is configured to conduct electricity in any direction through the explosion type circuit breaker. The contact device is arranged in the first shell. The contact device comprises a contact body, a metal grid and an explosion part. The contact body is provided with a grid matched with the metal grid. The explosion part is arranged on the side opposite to the grid of the contact body. The metal grid is configured to protrude from the contact body on the side away from the grid. The length of each metal grid protruding from the contact body is different. The length of the metal grid at the middle part is greater than that of the metal grid at the two ends. The metal grid can move in a direction perpendicular to the bus bar. The metal grid can capture and cut off an arc when the metal grid moves. The explosion type circuit breaker further comprises a lifting part arranged in the second shell. The lifting part is configured to allow the bus bar to swing into the second shell when cutting off. The metal grid is provided with a U-shaped groove facing the bus bar.

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