WO2024060597A1

WO2024060597A1 - Excitation protection apparatus for double-path or multi-path circuit breaking

Info

Publication number: WO2024060597A1
Application number: PCT/CN2023/088286
Authority: WO
Inventors: 戈西斌; 王欣; 段少波
Original assignee: 西安中熔电气股份有限公司
Priority date: 2022-09-21
Filing date: 2023-04-14
Publication date: 2024-03-28
Also published as: CN115483044A

Abstract

The present application relates to the field of electric power and new energy vehicles. Specifically, provided is an excitation protection apparatus for double-path or multi-path circuit breaking. The apparatus comprises an excitation source, a piston structure, and at least two conductors, which are arranged spaced from each other, wherein at least one ends of the conductors are not connected to each other. An impact end of the piston structure is provided with cut ends corresponding to the conductors, and the conductors and the cut ends of the piston structure are respectively arranged side by side or in a staggered manner. When the excitation source receives a trigger signal to act, the piston structure can cut off the conductors at the same time or according to a time sequence. By means of the present application, rapid cutting protection for a multi-load circuit or a multi-branch circuit is realized, and physical fractures between loads or branches are formed, thereby avoiding mutual interference or damage caused by a reverse current or an interference current continuously occurring between the loads or the branches.

Description

An excitation protection device for dual or multi-channel circuit breaking

Cross-references to related applications

This application claims priority to the Chinese patent application with application number 202211153171.9 and titled "A dual- or multi-channel circuit breaking excitation protection device" submitted to the State Intellectual Property Office of China on September 21, 2022. All of its The contents are incorporated into this application by reference.

Technical field

The present application relates to the fields of power control and electric vehicles, and specifically, to an excitation protection device for dual or multi-circuit circuit breaking.

Background technique

Currently, there are two types of circuit protection devices, thermal fuse and mechanical disconnection. Traditional thermal fuses achieve protection by melting and disconnecting circuits. They have shortcomings such as high power consumption (high calorific value), large size and weight, limited ability to withstand current shocks, long breaking time, and uncontrolled breaking process.

Mechanical disconnection protection devices are currently gradually expanding their application scope. Its general structure consists of: electronic ignition device, piston, conductive busbar (conductive plate) and outer shell. The electronic ignition device acts to release high-pressure gas to drive the piston displacement, and the piston disconnects the conductive busbar (conductive plate) to disconnect the circuit. , to achieve circuit protection. The mechanical disconnection protection device has the characteristics of fast response speed and high breaking capacity.

In order to adapt to the needs of various circuits, Chinese patent ZL2021225928293 discloses a multi-excitation source protection device, which realizes multi-channel circuit protection in one device through multiple groups of excitation sources (electronic ignition devices), pistons and conductive plates. Although multi-circuit circuit protection can be implemented in one device, it still has certain flaws: because multiple excitation sources and their corresponding pistons will always have a sequential impact time, there is no guarantee that multiple circuits will be disconnected at the same time; when it is necessary to sequentially When disconnecting, it needs to be realized with multiple sets of external trigger signal circuits.

In order to solve the above defects, Chinese patent ZL2021225949001 discloses an excitation protection device for multi-channel air pressure distribution. Through an excitation source (electronic ignition device), multiple sets of piston structures and conductive plates, simultaneous disconnection or sequential disconnection is achieved through different air paths. The need for disconnection. Although it is relatively easy to control, it is difficult to manufacture because the size of the gas path is difficult to control. At the same time, it is impossible to ensure that the gas pressure entering each gas path is the same. It cannot guarantee that each piston can move at the same speed. Therefore, It is difficult to control multiple sets of pistons to disconnect corresponding conductive plates at the same time to achieve simultaneous disconnection of multiple sets of circuits. Similarly, when it is necessary to disconnect in sequence, it is also difficult to control and implement based on multi-channel air pressure distribution.

Mechanical disconnection protection devices, because the fracture is generally an air fracture, the breaking capacity is relatively poor. Therefore, in order to improve the breaking capacity, a parallel fuse is generally connected on the conductive plate to improve the breaking capacity. For example, the multi-way air pressure distribution excitation protection device disclosed in the above-mentioned Chinese patent ZL2021225949001 improves the breaking capacity by connecting a parallel fuse. The parallel fuse also achieves protection through mechanical disconnection. Since the shell of the parallel fuse is generally connected to the channel for the piston to pass through, The size of the cut-off end of the piston matches, and the cut-off end of the piston needs to enter the channel to disconnect the parallel melt. However, due to differences in manufacturing and assembly, it is difficult to ensure that the cut-off end of the piston is directly opposite to the channel of the shell where the parallel melt is located, and the size is just satisfied, which is likely to cause action failure. When there are multiple groups of parallel melts, it is even more impossible to guarantee.

Contents of the invention

The technical problem to be solved by this application is to provide an excitation protection device for breaking dual or multiple circuits, which can ensure simultaneous disconnection or sequential disconnection of dual or multiple circuits without interfering with each other. At the same time, by changing the push plate structure of the parallel fuse, the possibility of action failure caused by manufacturing and assembly errors is solved, ensuring the disconnection of the melt in the parallel fuse, and improving the working reliability of the excitation protection device.

In order to solve the above technical problems, the technical solution of the present application provides an excitation protection device for dual or multi-channel circuit breaking. The excitation protection device includes an excitation source, a piston structure, and a conductor. The excitation protection device includes at least two spaced apart devices. The conductors, at least one end of each conductor is not connected to each other; the impact end of the piston structure has a cut end corresponding to each of the conductors, and each of the conductors and each cut end of the piston structure are arranged side by side or The conductors corresponding to the cut ends of the piston structure are insulated from each other; when the excitation source receives the trigger signal, the piston structure can disconnect the conductors simultaneously or in a time sequence.

Preferably, one ends of at least two of said conductors are integrally connected.

Preferably, an insulating isolation plate may be provided between the connection ends of each conductor.

Preferably, the impact end of the piston structure may be provided with notches corresponding to each of the conductors at intervals, and the notches are the cut-off ends.

Preferably, a pre-break can be provided on each conductor, and the shape of the notch bottom of each cut end of the piston structure matches the shape of the pre-break surface of each conductor.

Preferably, the pre-fracture surface shape of each conductor may be a V-shaped groove, a U-shaped groove or other structures that can reduce mechanical strength.

Preferably, a fuse can be connected in parallel to the conductor, and a melt component corresponding to each of the conductors and connected in parallel with each of the conductors is penetrated in the fuse; each of the melt components includes At least one melt. When each of the melt components includes more than two melts, the two or more melts are connected in parallel; each melt component is located in a different arc extinguishing chamber, and the arc extinguishing chamber is filled with arc medium. Preferably, the fuse may include a fuse housing, a cover plate and several channels penetrating the fuse housing and the cover plate, and at least two sets of the melt components are passed through the fuse housing. Between the body and the cover plate, the melt in each group of the melt components passes through at least one of the channels; a melt cutter is installed in each of the channels; the melt cutter A melt cutter pushing device is provided between the corresponding conductors; the piston structure can push the melt cutter pushing device and each melt cutter to disconnect from each conductor. The conductor corresponds to the melt component.

Preferably, an impact member with the piston structure may be provided between the conductor and the melt cutter pushing device. The melt cutter pusher is positioned by the cavity and the melt cutter.

Preferably, one end of the melt cutter pushing device facing the conductor can be disposed in the cavity, and an end surface of one end of the melt cutter pushing device located in the cavity is provided with an end surface for accommodating the melt cutter pushing device. Recess for receiving the disconnected portion of the conductor.

Preferably, the melt cutter may include a push block and a guide block, and the melt passing through each of the channels is clamped between the push block and the guide block.

Preferably, the cover plate may have a concave structure, and the melt cutter pushing device is located in the concave structure of the cover plate.

Preferably, a buffer device can be provided at the bottom of the fuse.

This application uses an excitation source to push a piston structure with two or more cut-off ends, and simultaneously cuts off the circuit branches connected by two or more conductors, and cooperates with the corresponding two or more arc extinguishers if necessary. Melt branches realize rapid cut-off protection for multi-load circuits or multi-branch circuits, forming physical breaks between loads or branches, thereby avoiding the continued occurrence of reverse current or interference current between loads or branches, causing mutual interference. or damaged.

This application uses parallel fuses to add a melt cutter pushing device between the melt cutter and the conductor of the fuse. When manufacturing or assembly errors exist, it can also ensure that the piston structure drives the melt cutter pushing device to ensure that The parallel melt is disconnected to improve working reliability; at the same time, the impact force of the piston structure is evenly distributed to the melt cutter pushing device through the melt cutter pushing device, so that the melt cutter is evenly stressed.

This application also improves product integration, makes it easier to wire electrical circuits, and reduces customers' usage costs.

Description of the drawings

Figure 1 is a schematic three-dimensional structural diagram of an embodiment of the present application.

Figure 2 is a schematic cross-sectional view of an embodiment of the present application.

Figure 3 is a schematic diagram of a dual-conductor structure according to an embodiment of the present application.

Figure 4 is a schematic structural diagram of a fuse according to an embodiment of the present application.

Figure 5 is a schematic structural diagram of a melt component according to an embodiment of the present application.

FIG. 6 is a schematic structural diagram of the piston according to an embodiment of the present application, in which A and B of FIG. 6 are respectively schematic structural diagrams of the piston structure from different perspectives.

Figure 7 is a schematic diagram of the action process in an embodiment of the present application, where A in Figure 7 is the normal working state, B in Figure 7 is during the action, and C in Figure 7 is the end of the action.

Figure 8 is a schematic structural diagram of a conductor, a melt component, and a fuse according to another embodiment of the present application. A in Figure 8 is a schematic structural diagram of a conductor, B in Figure 8 is a schematic structural diagram of a melt component, and C in Figure 8 is a fuse. Schematic.

Figure 9 is a schematic structural diagram of an excitation protection device according to another embodiment of the present application.

Figure 10 is a schematic diagram of the appearance structure of yet another embodiment of the present application.

Figure 11 is a schematic cross-sectional structural diagram of yet another embodiment of the present application.

Figure 12 is a schematic diagram of three conductor structures according to yet another embodiment of the present application.

FIG. 13 is a schematic diagram of a piston structure according to another embodiment of the present application.

Detailed ways

Regarding the above technical solutions, preferred embodiments are now cited and explained in detail with reference to the figures.

"Front, back, left, right, up, down, top, bottom, etc." used in the following embodiments are used to describe positional relationships only to help understand the positional relationships and do not constitute a limitation on the positional relationships.

An embodiment

The excitation protection device, referring to FIGS. 1 to 6 , may include an upper housing 10 and a lower housing 11 butted together. The first conductor 21 and the second conductor 22 are inserted between the upper case 10 and the lower case 11 . The first conductor 21 and the second conductor 22 are arranged at a certain distance. The two ends of the first conductor and the second conductor located outside the upper and lower housings are respectively connection ends, which can be connected to external circuits. An insulating separation plate 23 may be provided between the connection ends of the first conductor 21 and the second conductor 22 located outside the upper and lower housings. Referring to Figure 3, the first conductor 21 and the second conductor 22 are respectively provided with pre-breaks (211, 221). The upper and lower sides of the pre-breaks can be provided with disconnection weak points, such as V-shaped grooves in this embodiment. , it can also be a U-shaped groove or other structure that reduces mechanical strength. Under the action of mechanical force, the conductor is easily disconnected from the pre-break.

The upper casing 10 and the lower casing 11 may each be provided with a through hole, and a smaller cavity 48 and a larger cavity are provided in the through hole of the lower casing 11 in sequence from top to bottom. The through hole of the upper housing 10 can be in the shape of a step. An excitation source protective sleeve 12 is installed at the upper step of the through hole. The excitation source 13 is installed in the excitation source protective sleeve 12 and the excitation source 13 is fixed through the upper protective cover 14 On the excitation source protective cover 12, the excitation source protective cover 12 is installed on the upper housing 10 at the same time. The excitation source 13 can be an electronic ignition device, which can trigger ignition according to a received trigger signal and release high-pressure gas as a driving force.

The piston structure 30 , see FIGS. 2 and 6 , can be installed in the through hole of the upper housing 10 , between the excitation source 13 and the first conductor 21 and the second conductor 22 . A limiting device 301 is provided on the upper edge of the piston structure 30, and the limiting device is clamped on the through-hole slope of the upper housing 10 to form position limitation. A sealing device 302 is provided between the through-hole contact surfaces of the piston structure 30 and the upper housing 10 . The piston structure 30 and the through-hole contact surface of the upper housing 10 are in sealing contact, which can be achieved through an interference structure or through the sealing device of this embodiment.

The impact end of the piston structure 30 can have two spaced apart notches to form two cut-off ends 303. There is sufficient insulation distance between the two cut-off ends 303. That is to say, there is a gap on the impact end to separate the two cut-off ends 303. The part between them forms sufficient insulation between the two cut ends. The shape of the smaller cavity 48 in the lower housing 11 can match the outer shape formed by the two cut ends of the piston structure 30 . One cut end corresponds to one conductor, that is, the pre-cut end of the first conductor 21 corresponds to one cut end of the piston structure, and the pre-cut end of the second conductor 22 corresponds to the other cut end of the piston structure. The bottom of the notch of each cut end 303 can be in the shape of a groove, matching the shape of the upper surface of the pre-cut end of the conductor. When the two cut ends 303 of the piston structure 30 are located at the pre-breaks of the two conductors, the two conductors are separated through the two gaps set at intervals. The pre-breaks of the two conductors are insulated and isolated, that is to say, when the piston structure starts to move, the space between the two notches on the impact end insulates the pre-breaks of the two conductors, that is, the two conductors are insulated. The two conductors are insulated and isolated, and the pre-break on the conductor is embedded in the gap at the cutting end, which also better insulates the two conductors, so that during the cutting process, the two conductors can be better insulated and sealed, and the two conductors can be better insulated and sealed. There is no risk of arcing between conductors, and electromagnetic interference between conductors is low. After the conductor is cut off, the two cut ends of the impact end of the piston structure will enter the cavity 48 of the lower housing with the pre-breaks of the two conductors respectively, and the disconnected parts of the two conductors will be sealed to achieve a better insulation effect. .

A fuse 40 can be connected in parallel below the first conductor 21 and the second conductor 22. Refer to Figure 4. The fuse 40 is located in a cavity with a larger through hole in the lower housing 11. A fuse 40 can be provided at the bottom of the fuse 40. There is a buffer device 50, and a bottom protective cover 15 closes the bottom of the lower housing 11. The fuse 40 may include a fuse housing 41, a cover plate 42 and two sets of melt assemblies (43, 44). The cover plate 42 may have a concave structure to close the fuse housing 41 . The melt components (43, 44) can be respectively installed in the fuse housing 41 and the cover plate 42, and located in different arc extinguishing chambers, and the arc extinguishing chambers are filled with arc extinguishing medium 49. The position of the melt component 43 corresponds to the position of the first conductor 21 , and the position of the melt component 44 corresponds to the position of the second conductor 22 . Both ends of the melt assembly (43, 44) can be located outside the fuse housing 41 respectively to facilitate parallel connection with the first conductor and the second conductor. The resistance of the melt assembly (43, 44) is much higher than the resistance of the first conductor and the second conductor to ensure that under normal working conditions, current flows through the first conductor and the second conductor, and only in the first conductor and the second conductor, the current flows through the first conductor and the second conductor. After the two conductors are disconnected, the current will flow through the melt components (43, 44) connected in parallel with them.

The structures of the melt component 43 and the melt component 44 may be the same or different. Referring to Figure 5, the melt assembly 43 and the melt assembly 44 have the same structure, and two melts are respectively connected in parallel, and both ends of the two melts are connected integrally. Pre-fractures (431, 441) are respectively provided on the melt of the melt component. A channel 45 may be provided in the fuse housing 41 and the cover plate 42 at the location of the pre-break on the fuse assembly (43, 44), penetrating the upper and lower ends of the fuse housing 41 and the cover plate 42. The melt assembly 43 and the melt assembly 44 may also have different numbers of parallel melts according to actual needs.

A set of melt cutters 46 can be provided at each pre-fracture point of each melt component, that is, one end of the melt cutters 46 is inserted into the channel 45 and the other end is located above the cover plate 42 . A melt cutter pushing device 47 may be provided above the melt cutter 46 for pushing the melt cutter 46 to disconnect the melt assembly. The melt cutter pusher 47 may be located in a concave structure above the fuse cover 42 . The upper end of the melt cutter pushing device 47 is in contact with the lower end of the smaller cavity 48 of the lower housing 11 . The cavity 48 of the lower shell 11 is located on one side of the conductor. One end is stuck at the weak point of the two ends of the pre-fracture of the conductor. The upper end of the melt cutter pushing device 47 is located in the lower end of the cavity 48. The upper end of the melt cutter pushing device 47 An accommodating groove is formed on the end face, and the shape of the accommodating groove is the same as the structure of the lower surface of the conductor pre-break.

The melt cutter 46 may include a push block and a guide block disposed at the melt pre-break. One end of the push block is located above the cover plate 42. The push block and the guide block cooperate with each other to clamp the melt pre-break in the middle. And the limit block provided on the guide block forms a limit between the contact surface of the fuse housing and the cover plate. The melt cutter pushing device 47 is located above the pushing block.

Among the above components, the upper and lower shells, piston structure, melt cutter pushing device, and melt cutter are all made of electrically insulating materials.

The operating principle of this embodiment is shown in Figure 7:

When a fault current occurs in any circuit, the excitation source 13 receives the trigger signal to trigger ignition, releases high-pressure gas, and drives the piston structure 30 to move after overcoming the limit. The two cut ends of the piston structure cut off the pre-breaks on the corresponding conductors respectively. The arc then enters the cavity 48 and continues to be displaced and extruded. Since the cut end of the piston at the conductor break directly enters the cavity 48, an insulating non-interference state is actually formed between the first conductor and the second conductor at the break. When the first conductor and the second conductor are disconnected, most of the current flowing through the first conductor and the second conductor flows through the melt component connected in parallel with them, and the arc generated at the disconnection of the first conductor and the second conductor is Relatively small and extinguishes quickly.

The cut end of the piston is in sealing contact or small gap contact with the cavity 48, and the arc is squeezed in the small cavity 48, and the arc is elongated and extinguished by the squeeze. As the piston structure continues to move, the cut end of the piston structure brings the disconnected portion of the conductor into contact with the melt cutter pushing device 47, forming a package for the disconnected portion of the conductor, and the piston structure continues to push the melt cutter pushing device 47 and the melt The cutters 46 are displaced together to break all the melt in the melt assembly. After the melt component is disconnected, the arc generated after the melt component is disconnected is extinguished by the arc extinguishing medium.

Since a buffer device is provided at the bottom of the fuse, the impact force after the melt cutter cuts off the melt can be buffered. Since the melt cutter pusher 47 has a large area, even if there are errors in manufacturing and assembly, the cut end of the piston structure will contact the melt cutter pusher; at the same time, the melt cutter pusher covers the area where the melt cutter is located, and it can also ensure that the melt cutter pusher pushes the melt cutter. Therefore, by adding the melt cutter pusher, the action failure that may be caused by manufacturing and assembly errors is avoided, and the working reliability is improved; at the same time, the impact force of the piston structure is evenly dispersed on the melt cutter pusher, ensuring that the melt cutter is subjected to uniform vertical downward pressure. When cutting off the multi-path arc extinguishing melt structure, the smooth movement is more reliable, and better insulation is formed between the disconnected part of the conductor and the melt, avoiding the reverse arc from jumping to the conductor break part during the process of cutting off the melt.

At the same time, since there is only one excitation source and one piston structure, each cut-off end of the piston structure can ensure simultaneous action, avoiding the possibility of inconsistent response speeds due to multiple excitation sources or multiple pistons.

In this embodiment, the first conductor and the second conductor can be arranged at the same level, the two cut ends of the piston structure are arranged flush, and the first conductor and the second conductor can be disconnected at the same time.

In practical applications, the first conductor and the second conductor can be arranged at the same level, and the two cutting ends of the piston structure are set high and low. The distance between the two cutting ends of the piston and the conductor is different, and the first conductor and the second conductor can be disconnected according to the timing sequence. .

The first conductor and the second conductor can also be arranged in a staggered position, and the two cut ends of the piston structure are arranged flush. The distance between the two cut ends of the piston and the conductor is different, so that the first conductor and the second conductor are disconnected in a time sequence.

The first conductor and the second conductor may also be arranged in a staggered manner, and the two cut-off ends of the piston structure may be arranged at different heights, so that the first conductor and the second conductor are disconnected simultaneously or in sequence.

All melts in the melt assembly can be disconnected at the same time or in a time sequence. When it is necessary to disconnect in time sequence, you can This is achieved in the following ways: the parallel melt pre-fractures in each melt component can be located on the same horizontal plane, or can be set high or low; the length of the melt cutter can be different, and it only needs to be able to drive the melt cutter pushing device during the displacement process. A melt cutter will do.

Compared with related technologies, the advantages of this embodiment are:

In a dual-circuit power supply system, an excitation source drives the piston structure to cut off two conductors at the same time, and continues to cooperate with two independent arc extinguishing components to complete the breaking, which reduces the control difficulty of the dual-circuit circuit system, simplifies system wiring, and reduces cost.

In the dual-circuit circuits that work together synchronously and in correlation with each other, the instantaneous simultaneous interruption of the circuits is realized to avoid mutual interference between circuits or loads and prevent unnecessary property damage.

When it is necessary to cut off two groups of circuits in sequence, the cut-off can be achieved through the physical structure, making the protection more reliable.

The excitation protection device in this embodiment can be used to protect two circuits. When three-way circuits, four-way circuits, etc. need to be protected at the same time, the number of conductors can be increased as needed, such as three conductors, four conductors, etc., and the cut-off ends of the pistons corresponding to each conductor are also three or four. If necessary, three melt components, four melt components, etc. can be added accordingly.

In this technical solution, the impact end of the piston structure corresponds to each cut end of each conductor, and each conductor is cut off simultaneously or sequentially. During the cutting process, the interval between each cut end on the impact end of the piston structure is matched with the notch shape of each cut end to cover the upper part of the pre-break, so as to achieve sealing between each conductor and better insulation effect; after the pre-break is cut off, it is embedded in the notch of the impact end and moves with the cut end, so that there is no arc between each conductor, and it is not easy to generate electromagnetic interference with each other, so as to achieve better insulation effect.

The piston structure cooperates with the groove on the melt cutter pushing device to completely wrap the cut-off part of the conductor. During the movement of the piston, the cut-off part is well fixed, the insulation performance is better, and no other displacement deviating from the direction of piston movement occurs, which is safer and more reliable.

Another embodiment

Improved on the basis of the above embodiment. This embodiment is applied to a circuit node of a complex power circuit and provides breaking protection at the node. Referring to Figure 8, the conductor 60 has three connection ends, the larger end of which is the common end 61, and the other two smaller connection ends (62, 63) are the two branch ends. The structure of the melt assembly 70 of the arc-extinguishing fuse 40a connected in parallel below the conductor 60 corresponds to that of the conductor 60 . The common end 71 of the melt assembly 70 is connected to the common end 61 of the conductor, and the two branch ends (72, 73) of the melt assembly are respectively connected to the corresponding branch ends (62, 63) of the conductor. The two branches of the melt assembly 70 are respectively placed in different arc extinguishing chambers.

Refer to Figure 9 for the outline structure of the excitation protection device with three connection ends. An insulating isolation plate 23 is provided between the two connection ends (62, 63) outside the housing. Other structures and principles are the same as the above-mentioned embodiment. In this embodiment, the two branches of the conductor need to be disconnected at the same time.

In this embodiment, the impact end of the piston structure has two cut ends formed by two spaced apart notches. When the piston structure starts to move, the space between the two cut ends on the impact end insulatingly isolates the unconnected parts of each conductor (ie, the two branch ends), so that as the piston structure moves, When each cutting end cuts off the unconnected parts of each conductor (i.e., the two branch ends), there will be no series arcs between the unconnected parts (i.e., the two branch ends) of the conductors. The electromagnetic interference between the conductors is low; and the cut-off end structure formed by the gap cooperates with the interval part between the cut-off ends, and the cut part on the conductor is wrapped in the cut-off end, and moves with the movement of the piston structure to achieve better sealing and insulation. Effect.

When the cut part of the conductor moves with the cutting end to the melt cutter pushing device, it is stuck into the accommodation groove on the melt cutter pushing device, which better seals and insulates the broken parts of the conductor from each other.

The advantage of the other embodiment is that it can be applied to key nodes of complex power circuits to quickly disconnect the nodes and form insulation protection between each node. It can be applied to the simultaneous protection of multiple parallel loads of the same power supply. When one of them fails, all circuits can be quickly cut off to avoid expanding losses. It reduces the wiring cost of parallel circuit protection and improves product integration.

In this technical solution, each cutting end corresponding to each conductor is used on the impact end of the piston structure to cut off each conductor part simultaneously or in time sequence, that is, to cut off the non-interconnected parts of each conductor respectively. In this scheme, compared with cutting off the common end (or connecting end, or connecting point) of each conductor, during the cutting process, there is no arc between the conductors in this scheme; and when the cutting point is the common end, each conductor Branches are prone to arcing problems with each other, resulting in greater electromagnetic interference; and, compared with cutting off the common end, after cutting off, the arc conduction path at each branch end is the distance between the break at the branch end and the common end. Small; in this scheme, the non-connected parts of each conductor (i.e., branch ends) are cut off by each cutting end set at intervals. After cutting, the path distance of the arc conduction between each branch end is larger, and the separation The effect is better.

Yet another embodiment

On the basis of the above embodiment, the number of conductors is increased. The two independent conductors are increased to three, see FIGS. 10 to 13 , the first conductor 21 , the second conductor 22 , and the third conductor 24 . In order to reduce the volume of the excitation protection device, the three conductors are arranged in a staggered space, such as a triangular shape, an inverted triangle or other forms. In this example, it is a font layout. Correspondingly, the cut-off end of the piston structure 30a has also been changed accordingly. It has three cut-off ends with three insulation intervals. The cut-off end corresponding to the second conductor 22 placed high in the middle is set at a high position, and is offset from the two sides of the second conductor 22 at a low position. The cut ends of the first conductor 21 and the third conductor 24 corresponding to the piston structure are arranged at a low position. Outside the casing of the excitation protection device, an insulating isolation plate 23 is provided between two adjacent conductor connection ends.

How it works:

When a fault current occurs in one of the circuits, the excitation source receives the trigger signal and drives the piston structure to overcome the limit. The structure is displaced and disconnected at the same time or according to the distance between the cut end of the piston structure and the conductor, the first conductor, the second conductor and the third conductor are disconnected in time sequence, and then the melt component connected in parallel with them is disconnected.

This embodiment can be applied to systems such as three-phase power supply or three-phase motors, and can quickly disconnect three power supply lines at the same time to form insulation and protect them. It can be applied to three interconnected lines, and the height difference of the cutter is used to realize breaking protection according to a certain timing sequence. It can continue to be expanded to multi-channel power supply systems, and multiple circuits provide simultaneous cut-off protection.

In the above embodiment, there are two or three conductors. According to actual needs, multiple conductors can be provided. Correspondingly, multiple cut ends of the piston structure also need to be provided. When there are multiple conductors, according to actual circuit needs, one end of two conductors can be connected integrally, and the other conductors can be independently connected in parallel; it can also be grouped, with one end of one group of conductors or multiple groups of conductors connected integrally, and the other conductors independently connected in parallel. set up. Correspondingly, the corresponding parallel melt components can be changed according to the conductor shape.

Industrial Applicability

This application provides an excitation protection device for dual or multi-channel circuit breaking, which includes an excitation source, a piston structure, and at least two conductors arranged at intervals. At least one end of each conductor is not connected to each other; the impact end of the piston structure has a corresponding The cut ends of the conductors, the cut ends of each conductor and the piston structure are respectively arranged side by side or offset; when the excitation source receives the trigger signal and acts, the piston structure can disconnect each conductor at the same time or in sequence. This application implements rapid cut-off protection for multi-load circuits or multi-branch circuits, forming physical breaks between loads or branches, thereby preventing reverse current or interference current from continuing to occur between loads or branches, causing mutual interference or damage. A heating sheet and a battery module. The battery module includes a plurality of single cells and a heating sheet. The heating sheet includes a plurality of heating units and a plurality of connection units. The connection unit connects two adjacent heating units. unit; one of the heating units is attached to the side wall of one of the single cells, and the connecting unit corresponds to the gap area; the heat generated per unit area of the connecting unit is smaller than the heat generated per unit area of the heating unit. Reduce the heat of the heating plate corresponding to the gap area, effectively improving the phenomenon of "dry burning" because the heat at this location cannot be transferred to the single cell in direct contact, thus improving the damage of the heating plate caused by local overheating. Case.

Furthermore, it will be appreciated that the dual or multi-circuit circuit breaking excitation protection device of the present application is reproducible and can be used in a variety of industrial applications. For example, the dual-channel or multi-channel circuit breaking excitation protection device of the present application can be used in any device that requires an excitation protection device to achieve circuit protection.

Claims

An excitation protection device for dual or multi-circuit circuit breaking. The excitation protection device includes an excitation source, a piston structure, and a conductor. The excitation protection device includes at least two conductors arranged at intervals, each of the conductors At least one end of the piston structure is not connected to each other; the impact end of the piston structure has a cut-off end corresponding to each of the conductors, and each of the conductors and the cut-off ends of the piston structure are respectively arranged side by side or offset; the cut-off end of the piston structure The conductors corresponding to the terminals are insulated from each other; when the excitation source receives a trigger signal and acts, the piston structure can disconnect each of the conductors simultaneously or in a time sequence.
The excitation protection device according to claim 1, wherein one ends of at least two of the conductors are integrally connected.
The excitation protection device according to claim 1, wherein an insulating isolation plate is provided between the connection ends of each conductor.
The excitation protection device according to any one of claims 1 to 3, wherein the impact end of the piston structure is provided with notches corresponding to each of the conductors at intervals, and the notches are the cut-off ends.
The excitation protection device according to claim 4, wherein a pre-break is provided on each conductor, and the shape of the notch bottom of each cut end of the piston structure matches the surface shape of the pre-break of each conductor.
The excitation protection device according to claim 5, wherein the pre-broken surface shape of each conductor is a V-shaped groove, a U-shaped groove or other structures that can reduce mechanical strength.
The excitation protection device according to any one of claims 1 to 6, wherein a fuse is connected in parallel to the conductor, and the fuse is provided with a one-to-one corresponding to each of the conductors and with each of the conductors. The melt components of the conductors connected in parallel; each of the melt components includes at least one melt, and when each of the melt components includes more than two melts, the two or more melts are connected in parallel with each other; each melt component They are respectively located in different arc extinguishing chambers, and the arc extinguishing chambers are filled with arc extinguishing medium.
The excitation protection device according to claim 7, wherein the fuse includes a fuse housing, a cover plate and several channels penetrating the fuse housing and the cover plate, and at least two groups of the melt The assembly is inserted between the fuse housing and the cover plate, and the melt in each group of the melt assemblies passes through at least one of the channels; the melt is arranged in each of the channels. cutter; a melt cutter pushing device is provided between the melt cutter and the corresponding conductor; the piston structure can push the melt cutter pushing device and each conductor after disconnecting each conductor. The melt cutter cuts off the melt component corresponding to the conductor.
The excitation protection device according to claim 8, wherein a cavity matching the shape of the impact end of the piston structure is provided between the conductor and the melt cutter pushing device, and the melt cutter A knife pusher is positioned through the cavity and the melt cutter.
The excitation protection device according to claim 9, wherein the melt cutter pushing device is disposed in the cavity toward one end of the conductor, and the melt cutter pushing device located in the cavity The end face of one end is provided with A receiving groove for receiving the disconnected portion of the conductor.
The excitation protection device according to any one of claims 8 to 10, wherein the melt cutter includes a push block and a guide block, and the melt running through each of the channels is clamped on the between the push block and the guide block.
The excitation protection device according to any one of claims 8 to 11, wherein the cover plate has a concave structure, and the melt cutter pushing device is located in the concave structure of the cover plate.
The excitation protection device according to any one of claims 8 to 12, wherein a buffer device is provided at the bottom of the fuse.