CN210404710U

CN210404710U - Control circuit for fusing device and vehicle

Info

Publication number: CN210404710U
Application number: CN201921427354.9U
Authority: CN
Inventors: 喻榕; 王印; 李森; 刘子岳; 刘斯源
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-04-24
Anticipated expiration: 2029-08-28

Abstract

The present disclosure relates to a control circuit and a vehicle for a fusing device, the fusing device including: an arc-extinguishing fuse having an arc-extinguishing fuse and a breaker including a fuse and an operating portion capable of cutting the fuse after energization; the fuse wire is provided with a first leading-out end and a second leading-out end, one end of the arc extinguishing fuse wire is connected with the first leading-out end of the fuse wire, and the other end of the arc extinguishing fuse wire is connected with the second leading-out end of the fuse wire; the control circuit includes: a resistor connected in series with the fuse to form a first loop; a normally open reed switch and a first power supply which are connected in series with the action part in sequence to form a second loop; and a control coil connected in parallel at both ends of the resistor; when the current in the first loop is larger than or equal to the threshold current, the control coil can control the normally open reed pipe to be closed to conduct the second loop, so that the acting part cuts off the fuse. Through above-mentioned technical scheme, can improve fusing device's reliability.

Description

Control circuit for fusing device and vehicle

Technical Field

The disclosure relates to the technical field of vehicle control, in particular to a control circuit for a fusing device and a vehicle.

Background

With the continuous development of new energy vehicle technology, the design acceleration of the new energy vehicle is larger and larger, and the pulse current is far larger than the rated current during normal operation during rapid acceleration. In the related art, fuses are mostly used to protect high voltage safety. The power source of the new energy vehicle mainly adopts a power battery, but the discharge characteristic of the power battery is influenced by the ambient temperature and the electric quantity of the battery, and has great difference under different conditions. Conventional fuses are often limited in type selection and do not provide adequate protection, for example, when the fuse is biased small, the fuse is prone to open the circuit during normal operation, and endurance performance is not satisfied.

SUMMERY OF THE UTILITY MODEL

It is a first object of the present disclosure to provide a control circuit for a fuse device to improve reliability of the fuse device.

A second object of the present disclosure is to provide a vehicle including the control circuit for the fusing device provided by the present disclosure.

In order to achieve the above object, the present disclosure provides a fuse circuit for a fuse device, wherein the fuse device includes: an arc-extinguishing fuse having an arc-extinguishing fuse wire; an interrupter including a fuse and an operation portion capable of cutting the fuse after power is applied; the fuse wire is provided with a first leading-out end and a second leading-out end, one end of the arc-extinguishing fuse wire is connected with the first leading-out end of the fuse wire, and the other end of the arc-extinguishing fuse wire is connected with the second leading-out end of the fuse wire; wherein, the control circuit includes: the resistor is connected with the fuse wire in series to form a first loop; the normally open reed switch and the first power supply are sequentially connected in series and are connected with the action part in series to form a second loop; and a control coil connected in parallel to both ends of the resistor; when the current in the first loop is larger than or equal to the threshold current, the control coil can control the normally open reed pipe to be closed to conduct the second loop, so that the action part cuts off the fuse.

Optionally, the resistor is a precision resistor with adjustable resistance.

Optionally, the normally open reed switch is disposed inside the control coil.

Optionally, the action part comprises an insulating blade and a driving part, and the driving part can drive the insulating blade to move so that the insulating blade cuts the fuse wire.

Optionally, the interrupter further comprises a cylinder; the driving member includes: a piston telescopically disposed within the cylinder, the insulating blade being disposed on the piston; and the second circuit can explode when being conducted to drive the piston to drive the insulating blade to move the ignition tube.

Optionally, the piston and the insulating blade are integrally formed.

Optionally, the interrupter further comprises a first base for fixing the fuse.

Optionally, the breaker further comprises a second base located on one side of the first base, the fuse is kept away from the second base, a containing cavity is formed by connecting the first base and the second base, the containing cavity is used for containing the fuse, a first through hole communicated with the containing cavity is formed in the second base, and the first through hole is used for allowing the insulating blade to penetrate through.

Optionally, a second through hole is formed in the first base, and the insulating blade can be accommodated in the second through hole when the fuse is cut off.

According to a second aspect of the present disclosure, there is also provided a vehicle including the control circuit for a fusing device described above.

Through above-mentioned technical scheme, be provided with control circuit in fuse device, only when the electric current in the first return circuit is greater than or equal to threshold current, just can trigger control coil control open dry reed pipe closure in order to switch on the second return circuit to make the action part cut off the fuse, can avoid because of the improper condition that leads to of fuse device accident disconnection when normal work of fuse lectotype, improve fuse device's reliability.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a control circuit for a fuse apparatus according to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a control circuit for a fuse apparatus according to another exemplary embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an interrupter in a fuse device according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

1 arc extinguishing fuse 11 arc extinguishing fuse 2 breaker

21 fuse 22 action part 221 insulation blade

222 piston 223 squib 224 cylinder

23 first seat 231 first recess 24 second seat

241 first through hole 242 and second groove 25 accommodating cavity

3-resistor 4 normally-open type reed switch 5 control coil

6 first power supply 7 power battery

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, the use of directional terms such as "inner" and "outer" means inner and outer of the corresponding component profiles, unless otherwise specified. The use of the terms first and second do not denote any order or importance, but rather the terms first and second are used to distinguish one element from another. In addition, when the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements, unless otherwise indicated.

As shown in fig. 1 and 2, the present disclosure provides a control circuit for a fuse device, wherein the fuse device includes an arc-extinguishing fuse 1 and an interrupter 2, the arc-extinguishing fuse 1 having an arc-extinguishing fuse 11; the breaker 2 includes a fuse 21 and an operating portion 22 capable of cutting the fuse 21 after power is applied. The fuse 21 has a first lead-out terminal and a second lead-out terminal, one end of the arc extinguishing fuse 11 is connected with the first lead-out terminal of the fuse 21, and the other end of the arc extinguishing fuse 11 is connected with the second lead-out terminal of the fuse 21.

The fusing device of the disclosure can be used in a new energy vehicle, so as to provide protection for a power utilization device in the new energy vehicle. The power source of the new energy vehicle is mainly a power battery 7, and the discharge characteristic of the power battery 7 is influenced by the ambient temperature and the electric quantity of the power battery 7, so that the difference is large under different conditions, and the model selection of the fusing device is difficult.

In order to improve the reliability of the fusing device and enable the fusing device to be disconnected at an appropriate time to protect the electric device, the control circuit for the fusing device of the present disclosure includes: the normally open dry reed switch comprises a resistor 3, a normally open dry reed switch 4, a first power supply 6 and a control coil 5, wherein the normally open dry reed switch and the first power supply are sequentially connected in series, and the resistor 3 and a fuse wire 21 are connected in series to form a first loop; the normally open reed switch 4, the first power supply 6 and the action part 22 which are sequentially connected in series are connected in series to form a second loop; the control coil 5 is connected in parallel across the resistor 3. When the current in the first loop is greater than or equal to the threshold current, the control coil 5 can control the normally open reed pipe 4 to close to conduct the second loop, so that the acting part 22 cuts off the fuse 21.

Through the technical scheme, the control circuit is arranged in the fusing device, only when the current in the first loop is larger than or equal to the threshold current, the control coil 5 can be triggered to control the normally-open reed switch 4 to be closed so as to conduct the second loop, so that the acting part 22 cuts off the fuse wire 21, the situation that the fusing device is accidentally disconnected in normal work due to improper type selection of the fusing device is avoided, and the reliability of the fusing device is improved.

The control circuit of the present disclosure has a self-monitoring function, i.e., can close the normally open reed switch 4 according to whether the value of the current distributed to the control coil 5 is sufficient or not, to determine whether the current in the first circuit exceeds the threshold current or not. Because the control circuit has the self-monitoring function, a monitoring system does not need to be additionally configured, and the universality is improved. In addition, the transmission path of the trigger signal composed of the control coil 5, the normally open reed switch 4, the first power supply 6 and the action part 22 is short and has no intermediate link, so that the condition that the trigger signal is delayed or lost can be avoided, and the circuit can be disconnected in time.

The normally open reed switch 4 mainly comprises two pieces of reed which are both magnetic conductive and electric conductive, and a certain gap is formed between the two pieces of reed. When the current in the first loop is smaller than the threshold current, the magnetic force generated by the current of the control coil 5 is not enough to enable the two reeds to be attached to each other, and the second loop is not conducted; when the current in the first loop is greater than or equal to the threshold current, the two reeds can be attached to each other by controlling the magnetic force generated by the current of the coil 5, and the second loop is conducted. The normally open reed switch 4 has the advantages of high natural frequency and high on-off speed, and can timely disconnect an abnormal circuit.

When the power battery 7 works, the first loop is always provided with larger current, and the normally open reed switch 4 has the characteristic of controlling the opening and closing of a large-current circuit by using small current. If the current passing through the control coil 5 is too large, the magnetic force generated is large, resulting in damage to the normally open reed pipe 4. Therefore, the resistor 3 is connected in parallel to both ends of the control coil 5, and the resistance value of the resistor 3 is smaller than that of the control coil 5, so that the control coil 5 can obtain a small current.

A fully implementable control circuit for a fuse device according to the present disclosure is described below with reference to fig. 1 and 2, and the specific operation process is as follows: when the current in the first loop is smaller than the threshold current, the magnetic force generated by the current in the control coil 5 is not enough to close the normally open reed pipe 4, a second loop formed by the action part 22, the normally open reed pipe 4 and the first power supply 6 is not conducted, no current exists in the second loop, and the action part 22 does not act; when the current in the first loop is greater than or equal to the threshold current, the normally open reed pipe 4 can be closed by the magnetic force generated by the current in the control coil 5, the second loop formed by the action part 22, the normally open reed pipe 4 and the first power supply 6 is conducted, the current exists in the second loop, the action part 22 is excited to cut off the fuse wire 21, the current flows to the arc-extinguishing fuse 1 at the moment, and the arc-extinguishing fuse wire 11 is fused to protect the safety of the circuit.

In order to secure the blowing function of the arc-extinguishing fuse 11, the resistance value of the arc-extinguishing fuse 11 is generally 30 times or more that of the fuse 21. In this way, the quenching fuse 11 is not blown before the fuse 21 is cut.

In the present disclosure, the resistor 3 may be a precision resistor whose resistance value is adjustable. In order to realize that the normally open reed switch 4 can be closed when the current is greater than or equal to the threshold current and is in an open state when the current is less than the threshold current, the normally open reed switch can be realized by adjusting the ratio of the resistance values of the resistor 3 and the control coil 5 and further adjusting the magnitude of the current passing through the resistor 3 and the control coil 5. The model of the normally open reed pipe 4 is selected according to actual requirements, and the threshold current capable of enabling the normally open reed pipe 4 to be closed by magnetic force is determined. For example, the threshold current is set at 510A, and the normally open reed switch 4 is selected to be magnetically closed when the current through the control coil 5 is greater than 10A. According to ohm's law, the current through a certain section of conductor is inversely proportional to the resistance in the same circuit, so the ratio of the resistance values of the resistor 3 and the control coil 5 can be set to 1: 50. The current apportioned by this resistance value ensures that when the current in the first loop is greater than the threshold current 510A, the current through the control coil 5 is sufficient to generate a magnetic force that closes the normally open reed switch 4.

The present disclosure does not limit the positional relationship between the control coil 5 and the normally-open reed pipe 4, as long as it can be realized that when the current in the first circuit is greater than the threshold current, the magnetic force generated by the energization of the control coil 5 is sufficient to close the normally-open reed pipe 4. According to one embodiment of the present disclosure, as shown in fig. 1, the normally open reed switch 4 may be disposed inside the control coil 5. Of course, as shown in fig. 2, the normally open reed switch 4 may be disposed in the vicinity of the control coil 5.

According to an embodiment of the present disclosure, as shown in fig. 3, the action part 22 may include an insulating blade 221 and a driving member, and the driving member may drive the insulating blade 221 to move so that the insulating blade 221 cuts the fuse 21. When the second circuit is switched on with current, the drive is activated, which can drive the insulating blade 221 to move.

As an implementation form of the driving member, as shown in fig. 3, the breaker 2 may further include a cylinder 224; the driving member may include a piston 222 and an ignition tube 223, wherein the piston 222 is telescopically disposed in a cylinder 224, and the insulating blade 221 is disposed on the piston 222; the squib 223 can explode when the second circuit is turned on to drive the piston 222 to move the insulating blade 221. As shown in fig. 3, the squib 223 has a lead wire and connects the driving portion to the second circuit through the lead wire, when the second circuit is conducted and has current, the current ignites the lead wire, the squib 223 explodes, and high-pressure gas generated by the explosion pushes the piston 222, thereby driving the insulating blade 221 disposed on the piston 222 to move toward the direction of the fuse 21 to cut off the fuse 21.

Further, the piston 222 and the insulating blade 221 may be integrally formed. For example, it may be integrally formed by casting or welding. Compared with a split connection mode, the integrally formed piston 222 and the insulating blade 221 are firmly connected, and are not easily broken in the process that the insulating blade 221 cuts off the fuse wire 21.

In the present disclosure, as shown in fig. 3, the breaker 2 may further include a first base 23 for fixing the fuse 21. The fuse wire 21 is fixed to prevent the position of the fuse wire 21 from being shifted, and the insulating blade 221 cannot cut the fuse wire 21, so that the circuit cannot be opened in time, and the circuit safety is affected. As a way of fixing the fuse 21 to the first base 23, mounting holes may be formed in the fuse 21 and the first base 23, and the fuse 21 and the first base 23 may be connected together by a fastening member.

Further, the breaker 2 may further include a second base 24 located on a side of the fuse 21 far from the first base 23, and the first base 23 and the second base 24 are connected to form an accommodating cavity 25, where the accommodating cavity 25 is used for accommodating the fuse 21. The accommodating cavity 25 can isolate electric sparks generated when the fuse wire 21 is cut off by the insulating blade 221 in the accommodating cavity 25, so that the danger caused by the outward splashing of the electric sparks is avoided, and the accommodating cavity 25 can also accommodate fragments generated after the fuse wire 21 is cut off in the accommodating cavity 25. In addition, the fuse 21 is accommodated in the accommodating chamber 25, so that the overall appearance of the breaker 2 is more beautiful. The present disclosure is not limited to the manner in which the receiving chamber 25 is implemented, and any structure or method capable of receiving the fusible link 21 and preventing the spark and the debris from being splashed may be applied to the present disclosure. For example, the first base 23 is provided with a first groove 231, the second base 24 is provided with a second groove 242, the first groove 231 and the second groove 242 are butted to form the accommodating cavity 25, and the fusible link 21 is fixed on the bottom wall of the first groove 231.

In the case where the second base 24 is provided, a first through hole 241 communicating with the accommodating chamber 25 is provided on the second base 24, and the first through hole 241 is used for the insulating blade 221 to pass through. The shape of the first through hole 241 may match the shape of the insulating blade 221 so that the insulating blade 221 can smoothly pass through the first through hole 241. In addition, the first through hole 241 may also function as a guide.

According to an embodiment of the present disclosure, the first base 23 may further include a second through hole (not shown), and the second through hole is located on the first base 23 corresponding to the first through hole 241. The insulating blade 221 can be accommodated in the second through hole when cutting the fuse wire 21. In this way, the insulating blade 221 can continue to move downward a distance after cutting the fuse 21 to ensure that the fuse 21 is completely cut.

The present disclosure also provides a vehicle including the control circuit for a fusing device described above. As shown in fig. 1 and fig. 2, the first loop of the control circuit can be connected to the power battery 7 and the electric device (not shown in the figure) of the whole vehicle. The electric device can be a motor assembly, an instrument assembly and the like. When the current generated by the power battery 7 is larger than the threshold current, the control circuit can timely control the fusing device to be fused, and the electric device in the circuit is protected. The structure and advantageous effects of the control circuit for the fusing device in the vehicle of the present disclosure are as described above, and are not described herein again.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A control circuit for a fuse device, characterized in that,

the fusing device includes:

an arc-extinguishing fuse having an arc-extinguishing fuse wire;

an interrupter including a fuse and an operation portion capable of cutting the fuse after power is applied;

the fuse wire is provided with a first leading-out end and a second leading-out end, one end of the arc-extinguishing fuse wire is connected with the first leading-out end of the fuse wire, and the other end of the arc-extinguishing fuse wire is connected with the second leading-out end of the fuse wire;

the control circuit includes:

the resistor is connected with the fuse wire in series to form a first loop;

the normally open reed switch and the first power supply are sequentially connected in series and are connected with the action part in series to form a second loop; and

a control coil connected in parallel to both ends of the resistor;

when the current in the first loop is larger than or equal to the threshold current, the control coil can control the normally open reed pipe to be closed to conduct the second loop, so that the action part cuts off the fuse.

2. The control circuit as claimed in claim 1, wherein the resistor is a precision resistor with adjustable resistance.

3. The control circuit for a fuse device as recited in claim 1, wherein the normally open reed switch is disposed inside the control coil.

4. The control circuit for a fuse device according to any one of claims 1 to 3, wherein the actuating portion comprises an insulating blade and a driving member, the driving member being capable of driving the insulating blade to move so that the insulating blade cuts the fuse.

5. The control circuit for a fuse device according to claim 4, wherein the interrupter further comprises a cylinder; the driving member includes:

a piston telescopically disposed within the cylinder, the insulating blade being disposed on the piston; and

and the ignition tube can explode when the second loop is conducted so as to drive the piston to drive the insulating blade to move.

6. The control circuit for a fuse device according to claim 5, wherein the piston and the insulating blade are integrally formed.

7. The control circuit for a fuse device as in claim 5, wherein the interrupter further comprises a first base for securing the fuse wire.

8. The control circuit for a fusing device as defined in claim 7, wherein the interrupter further comprises a second base located on a side of the fusible link away from the first base, the first base and the second base are connected to form an accommodating cavity for accommodating the fusible link, the second base is provided with a first through hole communicated with the accommodating cavity, and the first through hole is used for the insulating blade to pass through.

9. The control circuit for a fuse device as recited in claim 7, wherein a second through hole is provided on the first base, and the insulating blade is receivable in the second through hole when cutting the fuse.

10. A vehicle characterized by comprising a control circuit for a fusing device according to any one of claims 1-9.