WO2022121205A1

WO2022121205A1 - Two-break excitation fuse having staged breaking

Info

Publication number: WO2022121205A1
Application number: PCT/CN2021/087903
Authority: WO
Inventors: 段少波; 石晓光; 戈西斌; 王欣
Original assignee: 西安中熔电气股份有限公司
Priority date: 2020-12-11
Filing date: 2021-04-16
Publication date: 2022-06-16
Also published as: CN112447464A

Abstract

A two-break excitation fuse having staged breaking, comprising a housing, an excitation device, a power device and conductive plates, an adjacent first cavity and a second cavity being formed in the housing, and the first cavity and the second cavity being partially communicated. The conductive plates pass through the housing, the first cavity and the second cavity. The excitation device and the power device are sequentially arranged in the first cavity. A sliding block is arranged in the second cavity, and one end of the sliding block extends through the region of communication with the first cavity into the first cavity. After the power device is driven by the excitation device to disconnect the conductive plate located in the first cavity, the sliding block can be pressured to extend into one end of the first cavity, driving the driving sliding block to disconnect the conductive plate located in the second cavity. The present excitation fuse features a broad breaking current range, high arc extinguishing ability, and good insulating performance after breaking.

Description

A double-break energizing fuse with step-by-step disconnection

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims the priority of the Chinese Patent Application No. 2020114610501 and entitled "A Double-Break Excitation Fuse with Step-Break" filed with the Chinese Patent Office on December 11, 2020, the entire contents of which are incorporated by reference in this disclosure.

technical field

The present disclosure relates to the fields of power control and electric vehicles, and in particular, to an excitation fuse that is controlled to cut off a current transmission circuit through an external signal.

Background technique

Products used for circuit overcurrent protection are fuses that are blown based on the heat generated by the current flowing through the fuse. The main problem is how to select a thermal fuse that matches the load. For example, in the case of protecting the main circuit of a new energy vehicle, if the load has a low multiple overload or short circuit, selecting a fuse with a low current specification cannot prevent the current from overshooting in a short time. If a fuse with a high current specification is selected, it cannot meet the fast protection requirements. At present, the output current of lithium battery packs that provide energy to new energy vehicles is about several times the rated current under short-circuit conditions, the fusing time becomes longer, the fuse protection time cannot meet the requirements, and such a large current is enough to damage the battery pack circuit devices, causing the battery pack to heat up and catch fire. The melting caused by the heating of the withstand current and the heating of the breaking current is caused by the current flowing through the fuse. Under the condition of inrush current (such as short-term high current when electric vehicle starts or climbing a slope), the fault current of a certain amplitude can be broken at a fast enough breaking speed, or the fault current of a certain amplitude cannot be broken at a fast enough breaking speed , can also achieve higher rated current, or withstand larger overload/impulse current without damage.

Another problem with thermal fuses is that they cannot communicate with external devices and cannot be triggered by signals other than current, such as signals from vehicle ECU, BMS or other sensors. If the circuit cannot be cut off in time when the vehicle is in a serious collision, soaked in water, or the battery temperature is too high after exposure, it may lead to serious incidents that the battery pack will burn and eventually damage the vehicle.

At present, there is a circuit breaker structure with a quick breaking fracture on the market, which mainly includes an electronic ignition device, a conductive plate, and an accommodating cavity for accommodating the falling conductive plate. The electronic ignition device generates high-pressure gas to drive the power device to break the conductive plate. After being broken, the conductive plate falls down into the accommodating cavity, so as to realize the purpose of quick disconnection of the circuit. However, it still has some deficiencies and defects, resulting in limited arc extinguishing capacity. For example, because it is a single-break circuit breaker, the arc extinguishing capacity is low, and it is difficult to break a large fault current.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present disclosure is to provide an excitation fuse with double fractures. By adding fractures, the arc extinguishing ability and breaking capacity are improved, and the step-by-step action of the fractures improves the insulation resistance after breaking.

In order to solve the above technical problems, the technical solution provided by the present disclosure is a step-by-step disconnection of a double-break excitation fuse, which includes a casing, an excitation device, a power device and a conductive plate, and is characterized in that the casing is provided with a Adjacent first and second cavities, the first and second cavities are partially in communication; the conductive plate passes through the shell, the first cavities and the second cavities The excitation device and the power device are arranged in sequence in the first cavity; a slider is arranged in the second cavity, and one end of the slider passes through the second cavity and the first cavity. A cavity communication part protrudes into the first cavity; after the power device disconnects the conductive plate located in the first cavity under the drive of the excitation device, the slider is pressed to protrude into the first cavity. One end of the first cavity drives the slider to disconnect the conductive plate located in the second cavity. The conductive plate and the casing and the power device and the first cavity are in sealed contact.

Optionally, a disconnected weak point is provided on the portion of the conductive plate impacted by the power device and the slider.

Optionally, the parts of the power device and the sliding block corresponding to the disconnected weak points of the impact conductive plate are formed as pointed protruding structures.

Optionally, the pointed protruding structure is a sloping acute angle structure formed by the intersection of one side of the vertical surface and the other side of inclined surfaces, or a tapered angle structure formed by the intersection of inclined surfaces on both sides.

Optionally, the structure of the sliding block is configured such that the part extending into the first cavity is pressed by the cutting device, and the sliding block moves in the second cavity, and the cutting block is located in the second cavity. the conductive plate in the second cavity.

Optionally, the slider is an arc slider, and the second cavity has an arc surface for the arc slider to fit and slide.

Optionally, in the first cavity and the second cavity, respectively, there are bending weak points corresponding to the broken weak points.

Optionally, on the basis of the above structure, in order to improve the arc extinguishing capability, at least one melt can be connected in parallel on the conductive plate. The two ends of the melt are respectively located on both sides of the broken weak point on the conductive plate in the first cavity. Or the two ends of the melt are respectively located on both sides of the broken weak point of the conductive plate in the first cavity and the second cavity.

Optionally, an arc-extinguishing chamber filled with an arc-extinguishing medium is opened on the casing; and the narrow-diameter portion of the melt penetrates the arc-extinguishing medium.

Optionally, sealing contact is between the conductive plate and the housing, and between the power device and the first cavity.

Optionally, the cutting device and the slider are made of insulating material.

Optionally, a limit mechanism is provided at the contact surface of the cutting device and the first cavity, and when the cutting device receives a driving force from the excitation device, the limit mechanism can be impacted. disconnect.

Optionally, the limiting mechanism may be provided with protrusions at intervals on the outer circumference of the cutting device, and grooves are opened on the inner wall of the corresponding cavity to snap the protrusions of the cutting device into the cavity. A position definition is achieved in the groove.

The fuse of the present disclosure can be applied in power distribution units, energy storage devices, or new energy vehicles for circuit protection.

Description of drawings

In order to illustrate the technical solutions of the present disclosure more clearly, the following drawings will be briefly introduced. It should be understood that the following drawings only show some implementations of the present disclosure, and therefore should not be regarded as It is a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

Figure 1 is a schematic cross-sectional view of the excitation fuse before the parallel fuse is added and disconnected.

Figure 2 is a schematic cross-sectional view of the excitation fuse after the fuse is not added in parallel and disconnected.

Figure 3 is a schematic cross-sectional view of the excitation fuse before adding a parallel melt and not disconnecting.

Figure 4 is a schematic cross-sectional view of the excitation fuse before adding the parallel melt and not disconnecting.

Detailed ways

Hereinafter, the embodiments will be described in detail with reference to the drawings. The excitation fuse (also referred to as a trigger fuse) of the present disclosure, as shown in FIG. 1 to FIG. 4 , mainly includes a housing, a conductive plate 104 , an excitation device (also referred to as a trigger device) 101 and a power device (also referred to as a trigger device) for interrupting means) 103.

The casing can be formed by combining the upper and lower casings or the left and right casings, and a sealing device 116 is provided at the combined contact surface. In this embodiment, the casing is composed of an upper casing 102 and a lower casing 106 . A first cavity 107 penetrating the upper end of the shell is opened in the shell, and a second cavity 108 is opened on the lower side of the first cavity 107 , and the first cavity 107 communicates with the lower end of the second cavity 108 . A conductive plate 104 is pierced through the casing, the conductive plate 104 passes through the first cavity 107, the second cavity 108 and the partition 109 between the two cavities, and the conductive plate 104 separates the two cavities into two part. The two side walls of the partition plate 109 are planar structures, and the free end surfaces thereof are arc surface structures. In the first cavity 107 located above the conductive plate 104, an excitation device 101 and a power device 103 are sequentially arranged from top to bottom. The excitation device 101 is fixedly arranged on the top of the first cavity 107, and is limited by a limit step provided in the vertical cavity, and the upper part thereof can be fixed by a pressing plate or a pressing sleeve (not shown). In this embodiment, the excitation device 101 is an electronic ignition device, which can receive an excitation signal sent from the outside when a fault occurs, ignite and detonate to generate high-pressure gas, form a driving force, and drive the power device 103 to act.

The power device 103 is located in the first cavity 107 between the excitation device 101 and the conductive plate 104, and is located above the conductive plate 104 in the cavity, and its impact end is kept a certain distance from the conductive plate 104 to ensure the power The impact force of the device 103 . The contact surface between the power device 103 and the first cavity 107 is provided with a sealing device 116 to ensure that all the driving force generated by the excitation device 101 acts on the power device 103 without leakage, so as to avoid insufficient driving force and prevent gas from entering the conductive plate 104 At the fracture, arc extinguishing is affected; at the same time, the arc is prevented from entering the chamber part where the power excitation device 101 is located, which affects the driving circuit. In this embodiment, the sealing device 116 is a sealing ring. When the power device 103 is not driven by the driving force, that is, at the initial position, a limiting mechanism 114 is provided at the contact surface between the power device 103 and the cavity to ensure that the power device 103 is fixed at the initial position and will not be in the cavity. Displacement causes malfunction. The limiting mechanism 114 may be provided with small bumps at intervals on the outer circumference of the power device 103, and grooves are formed on the inner wall of the corresponding cavity, and the bumps of the power device 103 are snapped into the grooves to achieve position limitation. When the power device 103 receives the driving force from the excitation device 101, the limiting mechanism 114 can be disconnected under the impact to release the limiting effect. An impact cutter head is arranged under the power device 103, and the impact cutter head is a pointed protruding structure. The pointed protruding structure can be a beveled acute angle structure formed by the intersection of one side with a vertical plane and the other side by the intersection of inclined planes, or a cone formed by the intersection of inclined planes on both sides. Sharp corner structures or other structures that facilitate cutting the conductive plate 104 . In this embodiment, the power device 103 is a piston, and the impact cutter head has a beveled acute angle structure, and the beveled acute angle structure of the impact cutter head is arranged on the side close to the housing wall.

On the part of the conductive plate 104 corresponding to the impact cutter head of the power device 103, a broken weak point 110 is opened, and the broken weak point 110 is a V-shaped groove, a U-shaped groove that penetrates the width of the conductive plate 104 and is opened on one or both sides of the conductive plate 104. Slots or other structures that reduce the strength of the conductive plate 104 where it breaks. In this embodiment, the broken weak point 110 is provided on the portion of the conductive plate 104 on the side of the first cavity 107 corresponding to the acute angle structure of the bevel of the impact cutter head; The portion of the conductive plate 104 at the plate 109 is provided with a bending weak point 111 .

In the second cavity 108 , the side opposite to the partition plate 109 is an arc surface, and the lower end surface of the partition plate 109 located at the second cavity 108 is set as an arc surface. The arc-shaped slider 105 is arranged in the second cavity 108 , the two surfaces in contact with the lower end surfaces of the second cavity 108 and the partition plate 109 are arc-shaped surfaces, and the two ends are planar structures. A limiting mechanism 115 is provided on the arc-shaped sliding block 105 to ensure that the arc-shaped sliding block 105 is located at the initial position when no external force is applied. In the initial position, the arc-shaped slider 105 is located at the second cavity 108 where the lower end surface of the partition plate 109 is located. An arc-shaped surface of the arc-shaped slider 105 abuts against the arc-shaped surface of the second cavity 108 opposite to the partition plate 109 , and the arc-shaped end surface of the free end of the partition plate 109 abuts against the arc-shaped slider 105 . on the other curved surface. When the arc-shaped slider 105 is in the initial position, its one end part protrudes in the first cavity 107, and when its end face partially in the first cavity 107 is in the initial position, its end face is inclined; In the second cavity 108, the end face is also inclined at the initial position. On the conductive plate 104 located in the second cavity 108, at the position corresponding to the end face portion of the arc-shaped slider 105 with the shortest distance from the conductive plate 104, a broken weak point 112 is provided, and the broken weak point 112 is opposite to the second position. A bending weak point 113 is provided on the conductive plate 104 on the other side of the second cavity 108 . The inclined surfaces at both ends of the arc-shaped slider 105 are configured such that when the power device 103 disconnects the conductive plate 104 located in the first cavity 107 , the power device 103 will press the arc-shaped slider 105 located in the first cavity 107 . On the end face, the arc-shaped slider 105 is driven to overcome its limiting mechanism 115, and moves along the second cavity 108 to impact the conductive plate 104 located in the second cavity 108. The end surface corresponding to the disconnected weak point 112 of the conductive plate 104 is an acute-angled structure of an inclined plane. Under the action of a huge pressing force, the arc-shaped slider 105 disconnects the conductive plate 104 located in the second cavity 108 . When the power device 103 moves to the dead center position, its side is close to the end face of the arc-shaped slider 105, and the arc-shaped slider 105 is positioned, so that the disconnected conductive plate 104 can be isolated by the arc-shaped slider 105. Adjusting the angle and size of the arc-shaped slider 105 can delay the time when the fracture of the conductive plate 104 in the second cavity 108 is broken.

The materials of the power device 103 and the arc-shaped slider 105 are all insulating materials. The slider set in the second cavity 108 may be an arc-shaped slider 105 or a slider of other structures, as long as the inclined surface of the slider extending into the first cavity 107 can be pressed by the power device 103 in the first cavity 107 . The second mold cavity 108 moves in the second mold cavity 108 to cut off the conductive plate 104 located in the second mold cavity 108 . The structure of the second cavity 108 also only needs to satisfy that the slider can disconnect the conductive plate 104 located in the second cavity 108 when an external force is applied. Combining the arc-shaped slider 105 with a cavity with an arc-shaped surface can make the fuse smaller and the slider run more smoothly.

Hereinafter, the operation principle of the excitation fuse having the above-mentioned configuration will be described.

When the excitation device 101 receives the excitation signal from the outside, a large amount of high-pressure gas is generated by ignition and detonation, and the power device 103 is driven to move at a high speed in the direction of the conductive plate 104; Disconnecting the conductive plate 104 at a time forms a first fracture in the conductive plate 104 .

When the fault current is large, a large arc will be generated after the first fracture is disconnected. Since the arc is extinguished only by the air medium, at this time, the first fracture is in an arc-holding state, that is, the arc will not automatically automatically after it is generated. Extinguish, when the state is stable, that is, when the fracture distance is stable, the voltage is stable, and the current is stable, the arc will continue. At this time, the power device 103 and the inner wall of the casing and the bent part of the conductive plate 104 are in an interference fit. The position forms a continuous and complete line, and the arc generated at the first fracture is squeezed, so the arc is elongated, the arc diameter is compressed, the arc resistance increases, and the fault current decreases. Then, the power device 103 continues to move against the arc-shaped slider 105, presses the arc-shaped slider 105 to move and hits the broken weak point 112 of the conductive plate 104 in the second cavity 108 to make the conductive plate 104 disconnect for the second time , a second fracture is formed in the second cavity 108 . At this time, the arc-shaped slider 105 and the arc-shaped surface in the second cavity 108 are closely matched, and the arc generated at the second fracture is squeezed, so that the arc is quickly extinguished. The temperature is relatively low, so the insulation performance of the second fracture after breaking is excellent, and the reliability of the disconnection of the conductive plate 104 is ensured.

When the fault current is small, the two fractures can better perform breaking and arc extinguishing.

Therefore, when no other arc extinguishing measures are adopted, and only the arc is extinguished by air, the arc extinguishing ability and the breaking reliability are improved by step-by-step disconnection and rapid arc extinguishing through two fractures.

In order to better improve the arc extinguishing ability and breaking capacity, auxiliary arc extinguishing can also be added on the basis of the above to achieve rapid arc extinguishing. 3 and 4, the melt 114 for arc extinguishing is connected in parallel with the conductive plates 104 located at the first cavity 107 and the second cavity 108, and an arc extinguishing cavity 115 is opened on the shell. The cavity 115 is filled with an arc-extinguishing medium, and the melt 114 passes through the arc-extinguishing medium, and two ends of the melt 114 are connected in parallel with the conductive plate 104 through the casing. The melt 114 is provided with a narrow diameter portion, and the narrow diameter portion of the melt 114 is located in the arc extinguishing medium. The position where both ends of the melt 114 are connected in parallel with the conductive plate 104 needs to satisfy that when the conductive plate 104 is disconnected for the first time, the melt 114 is still in a conducting state, and after the conductive plate 104 is disconnected for the first time, the melt 114 can Fused before the second disconnection. 3 and 4, one end of the melt 114 is connected to the conductive plate 104 at the outer side of the disconnected weak point 110, and the other end of the melt 114 is connected to the conductive plate 104 at the partition plate 109 (the bending weak point 111 and the bending weak point 113). between) or with the conductive plate 104 located outside the disconnected weak point 112. The part of the shell where the arc extinguishing chamber is located can be made separately.

Hereinafter, the operation principle of the parallel melt 114 in FIG. 3 will be described.

The resistance of the melt 114 connected in parallel on the conductive plate 104 is larger than the resistance of the conductive plate 104 , and the arc resistance generated at the fracture is far greater than the resistance of the melt 114 .

Under a low multiple fault current, the excitation device 101 receives the excitation signal to trigger the generation of high-pressure gas, and then pushes the power device 103 to break the weak point 110 of the conductive plate 104 to form the first fracture. The low multiple fault current is transferred to the melt 114 connected in parallel with the two ends of the first fracture of the conductive plate 104, and the heat generated by the narrow-diameter portion of the melt 114 is not enough to melt the narrow-diameter portion. flow effect. At this time, the melt 114 is connected in series with the disconnected weak point 112 on the conductive plate 104. Compared with the total resistance before the first fracture is disconnected, the voltage across the conductive plate 104 remains unchanged, so the fault current decreases. Then, the power device 103 continues to move and then presses the arc-shaped slider 105 to open the second fracture, where the reduced fault current is interrupted, and the arc is extinguished in a very short time. Through the two fractures and the melt 114, rapid arc extinguishing and breaking capabilities are achieved.

Under the medium multiple fault current, the excitation device 101 receives the excitation signal to trigger the generation of high-pressure gas, and then pushes the power device 103 to break the weak point 110 of the conductive plate 104 to form the first fracture. The medium multiple fault current is transferred to the melt 114 connected in parallel with the two ends of the first fracture of the conductive plate 104 , and when it flows through the narrow diameter portion of the melt 114 , heat is generated, and the narrow diameter portion of the melt 114 begins to melt. At this time, the melt 114 is connected in series with the disconnected weak point 112 on the conductive plate 104. Compared with the total resistance before the first fracture is disconnected, the voltage across the conductive plate 104 remains unchanged, so the fault current decreases. During the melting process of the melt 114, the power device 103 continues to move and then presses the arc-shaped slider 105 to open the second fracture. At this time, the melt 114 and the second fracture work together to break the reduced fault current. At this time, The arc extinguishing medium also participates in arc extinguishing, extinguishes the arc, and can achieve rapid arc extinguishing. In this case, there is almost no arc burning at the first fracture, and the insulation performance after breaking is excellent.

Under the high multiple fault current, the excitation device 101 receives the excitation signal to trigger the generation of high-pressure gas, and then pushes the power device 103 to break the weak point 110 of the conductive plate 104 to form the first fracture. The high multiple fault current is rapidly transferred to the melt 114 connected in parallel with the two ends of the first fracture of the conductive plate 104. Due to the large fault current, a large amount of heat is generated at the narrow diameter portion of the melt 114 and the melt 114 is rapidly fused. An arc is generated where the narrow diameter portion of the melt 114 is fused, and the arc extinguishing medium participates in the arc extinguishing, so that the arc is quickly extinguished. In the present disclosure, the arc extinguishing medium mainly refers to quartz sand. The arc melts the quartz sand, consumes the energy of the arc, reduces the temperature of the arc, and the gasification of the quartz sand can also increase the pressure of the arc, so as to achieve the effect of arc extinguishing. At this time, the power device 103 continues to move and then presses the arc-shaped slider 105 to open the second fracture, forming a physical fracture, increasing the insulation capacity after the fracture, and further ensuring the reliability of the fracture.

In the parallel mode of the melt 114 in FIG. 4 , two fractures are located between the two ends of the parallel melt 114 and the connection point of the conductive plate 104 . When starting to break, the excitation device 101 receives the excitation signal to trigger the generation of high-pressure gas, and then pushes the power device 103 to break the weak point 110 of the conductive plate 104 to form the first fracture. The fault current is quickly transferred to the melt 114 connected in parallel with the two ends of the conductive plate 104. At this time, the narrow diameter part of the melt 114 mainly fuses and extinguishes the arc in the arc-extinguishing medium, and the power device 103 continues to move and then presses the arc-shaped slider. 105 The second fracture is opened only to increase the insulation capacity after the break.

The above contents are only specific implementations of the present disclosure, and are used to illustrate the technical solutions of the present disclosure, but not to limit them. Note, those of ordinary skill in the art should understand that: any person skilled in the art can still make modifications to the technical solutions described in the foregoing content or easily think of changes within the technical scope disclosed in the present disclosure, or make changes to the technical solutions therein. Some technical features are equivalently replaced; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Industrial Applicability

Compared with the traditional excitation fuse, the excitation fuse of the present disclosure has the following advantages:

1. Double fracture design, the voltage applied to each fracture is only 1/2 of that of a single fracture, which reduces the recovery voltage of the arc gap and can break arcs with higher voltage levels and increases the breaking voltage.

2. The delayed opening of the two fractures and the melting of the melt can make the fault current and temperature of the fractures opened later lower, so it is easier to cut off the arc, and the insulation performance after breaking is excellent; at the same time, the current breaking range is widened and the arc extinguishing is improved. capacity and breaking capacity, and the insulation performance is reliable after breaking.

3. It can delay the breaking time of the second fracture by adjusting the angle and size of the arc slider, which creates easier arc extinguishing conditions for the second fracture, so the breaking capacity is improved.

4. The cutting device and the casing are relatively sealed to prevent the gas from entering the arc extinguishing chamber and affecting the breaking, and at the same time prevent the arc from entering the chamber where the excitation device is located and damaging the drive circuit.

5. The shell is sealed with no ventilation holes, which can prevent foreign objects from contaminating the fracture, and also prevent high-temperature arcs from spraying out of the shell to damage the surrounding devices, improving the protection level.

6. Compared with the single-break excitation fuse, the double-break excitation fuse product with step-by-step rotation and disconnection remains the same in weight and volume, and the cost does not increase significantly.

Claims

A step-by-step double-break excitation fuse, comprising a casing, an excitation device, a power device and a conductive plate, characterized in that:

The casing is provided with adjacent first and second cavities, and the first and second cavities are partially connected; the conductive plate passes through the casing, the first a cavity and the second cavity; the excitation device and the power device are arranged in sequence in the first cavity; a slider is arranged in the second cavity, and one end of the slider passes through the The place where the second mold cavity communicates with the first mold cavity extends into the first mold cavity; when the power device disconnects the conductive plate located in the first mold cavity under the driving of the excitation device, it presses One end of the slider protrudes into the first cavity, and the slider is driven to disconnect the conductive plate located in the second cavity.
The step-breaking double-break energizing fuse according to claim 1, characterized in that a weak breaking point is set on the part of the conductive plate that is impacted by the power device and the slider.
The step-breaking double-break energizing fuse according to claim 2, characterized in that, the parts of the power device and the slider corresponding to the broken weak points of the impact conductive plate are formed as pointed protruding structures.
The double-break energizing fuse for step-by-step disconnection according to claim 3, wherein the pointed protruding structure is a beveled acute angle structure formed by one side being a vertical plane and the other side being intersected by inclined planes, or both sides are intersected by inclined planes Constructed cone angle structure.
The step-breaking double-break energizing fuse according to claim 3, wherein the structure of the slider is configured such that the portion protruding into the first cavity is compressed by the cutting device. The slider moves in the second cavity to cut off the conductive plate located in the second cavity.
The double-break energizing fuse disconnected step by step according to claim 5, wherein the sliding block is an arc-shaped sliding block, and the second cavity has a sliding block for the arc-shaped sliding block to fit and slide. Arc face.
The double-break energizing fuse for step-by-step disconnection according to claim 2, characterized in that, on the conductive plates in the first cavity and the second cavity, there are respectively provided with the disconnection The weak point corresponds to the bending weak point.
The double-break energizing fuse for step-by-step disconnection according to claim 2, wherein at least one melt is connected in parallel on the conductive plate.
The step-breaking dual-break energizing fuse according to claim 8, wherein the two ends of the melt are respectively located on both sides of the broken weak point on the conductive plate in the first cavity.
The step-breaking double-break energizing fuse according to claim 8, wherein both ends of the melt are respectively located at the breaking points of the conductive plates in the first cavity and the second cavity. Open the sides of the weak spot.
The step-breaking double-break excitation fuse according to any one of claims 8 to 10, wherein an arc-extinguishing chamber filled with an arc-extinguishing medium is provided on the casing; The narrow diameter portion is partially penetrated in the arc extinguishing medium.
The double-break energizing fuse for step-by-step disconnection according to claim 1, wherein the conductive plate and the casing and the power device and the first cavity are in sealed contact.
The step-breaking double-break energizing fuse according to claim 1, wherein the cutting device and the slider are made of insulating material.
The double-break energizing fuse cut in steps according to claim 1, wherein a limiting mechanism is provided at the contact surface of the cutting device and the first cavity, and the cutting device is subjected to When the driving force from the excitation device is used, the limiting mechanism can be disconnected under impact.
The double-break energizing fuse for step-by-step disconnection according to claim 14, characterized in that, the limiting mechanism may be provided with bumps at intervals on the outer circumference of the cutting device, and the corresponding inner wall of the cavity is provided with bumps. A groove is formed on the upper part, and the protrusion of the cutting device is clamped into the groove to realize position limitation.
A power distribution unit, or an energy storage device, or a new energy vehicle, the application includes at least one excitation fuse according to any one of claims 1 to 15.
A power distribution unit, or an energy storage device, or a new energy vehicle, the application includes at least one excitation fuse according to any one of claims 1 to 15.
A power distribution unit, or an energy storage device, or a new energy vehicle, the application includes at least one excitation fuse according to any one of claims 1 to 15.