CN217387471U

CN217387471U - Easy-to-cut fusing copper bar

Info

Publication number: CN217387471U
Application number: CN202220033573.4U
Authority: CN
Inventors: 徐敏文; 张磊; 史艳红; 曹湃
Original assignee: Kunshan Guoli Yuantong New Energy Technology Co ltd
Current assignee: Kunshan Guoli Yuantong New Energy Technology Co ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-09-06
Anticipated expiration: 2032-01-07

Abstract

The utility model discloses an easily cut off fusing copper bar, include: the copper sheet connector comprises a first connecting copper sheet, a second connecting copper sheet and at least one cutting reed connected between the first connecting copper sheet and the second connecting copper sheet, wherein at least one cutting surface notch is formed in the cutting reed, and a cutting point is formed at the position, located at the cutting surface notch, of the cutting reed. This cut-off point that easily cuts off fusing copper bar setting can make the disconnection of material physics easier, ensure the validity of cutting off, the reliability is improved, and set up the fusing hole in order to be formed with the fusing point on cutting off the reed, utilize metallurgical effect to control the section melting point, realize relatively accurate fusing protection and insulating properties, guarantee to cut off inside insulation resistance index technical safety requirement that satisfies behind the reed cutting off, cut off the alloy resistance portion that the reed formed for adopting manganese-copper alloy material simultaneously, can regard as return circuit monitoring signal sampling to use, can shorten the acquisition of signal and the response time of transmission link.

Description

Easy-to-cut fusing copper bar

Technical Field

The utility model relates to a fireworks formula circuit breaker technical field, in particular to easily cut off fusing copper bar.

Background

At present, electric automobiles generally have three electric systems, namely a battery, a motor and an electric control system, and the three main components are connected through a high-speed communication bus and are the most important part of the whole electric automobile electric system. The battery system mainly comprises a power battery pack and a BMS (battery management system), wherein the power battery pack comprises a plurality of power battery cells, connecting devices, a high-voltage power distribution unit, wires and the like which are combined together in series and parallel, and the BMS is responsible for monitoring the state of the battery, controlling the charging and discharging of the battery and interacting the state information of the battery with a motor driver and a vehicle control unit.

The power-off protection means of the battery pack circuit breaking unit in the market at the present stage is a solution of a high-voltage relay and a high-voltage fuse, when the current is in a certain range, the relay can normally operate to control the on-off of a loop; only under high fault current, the fuse starts to work, and the loop current is cut off through the fuse body. This seemingly conservative solution in fact still presents a certain risk: between the working range of the high-voltage relay and the working range of the fuse, a gray area which is not within the working range exists, when the current exceeds the working range of the relay but still does not reach the fuse fusing energy of the fuse, particularly, the impedance is improved along with the aging of the high-voltage fuse, the fusing response time is prolonged, and the high-temperature battery firing accident is caused because circuit components such as the relay are damaged. There is also a risk of short-circuiting, overheating, ignition, etc. of the battery pack in certain extreme situations, such as a collision.

Therefore, the pyrotechnic power-off safety protection switch is provided in the market at present, and is matched with a high-voltage relay to provide guarantee for a circuit system. The benefit of doing so lies in, this kind of normally closed type firework formula outage safety protection switch has adopted the principle of gas blasting inflation copper bar in the top switch, and physics disconnection fault circuit has stopped that the components and parts that high current leads to damage, the burning that generates heat. The pyrotechnic power-off safety protection switch has no working range limitation, does not consume energy in the working period, is not influenced by vibration, and has an effective period as long as 15 years. More importantly, compared with the high time delay that the fuse of the traditional fuse is triggered to fuse when the fuse of the traditional fuse needs to sense the overload current, the pyrotechnic power-off safety protection switch can complete the circuit-breaking operation within one thousandth of a second while receiving an external collision signal or a fault signal monitored by a Battery Management System (BMS). However, the copper bar that uses in the pyrotechnical formula outage safety protection switch of prior art ubiquitous can not ensure effectively to carry out the risk of cutting off, uses to have very big potential safety hazard, and the security performance is waited to improve. Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

In order to solve the technical problem, the utility model provides an easily cut off fusing copper bar not only easily cuts off, ensures the validity that cuts off, and the reliability is higher, has fusing protect function moreover, guarantees to cut off the back insulation resistance requirement to can regard as return circuit monitoring signal sampling to use.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: an easy-to-cut fusing copper bar comprises: the copper sheet connector comprises a first connecting copper sheet, a second connecting copper sheet and at least one cutting reed connected between the first connecting copper sheet and the second connecting copper sheet, wherein at least one cutting surface notch is formed in the cutting reed, and a cutting point is formed at the position, located at the cutting surface notch, of the cutting reed.

As a further improvement, the cutting-off reed has a fusing hole near its two ends, and a fusing point is formed at the two outer narrow diameters of the fusing hole.

As a further improvement of the utility model, cut off the reed corresponding to the fusing point department all welds there is the tin point.

As a further improvement, the upper and lower both sides that cut off the reed are all symmetrically provided with the cut surface notch, the cutting point is located two between the cut surface notch.

As a further improvement of the present invention, the cutting reed is provided with two cut surface notches side by side along the width direction thereof, and the cutting point is formed correspondingly with two.

As a further improvement of the utility model, the cross section of the notch of the cutting surface is V-shaped or arc-shaped.

As a further improvement of the present invention, the cut-off reed is an alloy resistance portion formed for using a manganese-copper alloy material, so that the cut-off reed has a constant resistance.

As a further improvement of the utility model, it is three that the reed is provided with interval distribution side by side, it is three to cut off the reed and respectively with its corresponding tip fixed connection, two through two connection pieces the connection piece welds respectively first connection copper sheet with on the second connection copper sheet.

As a further improvement of the present invention, the first connecting copper sheet and the second connecting copper sheet are provided with a positioning hole and a positioning groove.

As a further improvement of the present invention, the first connecting copper sheet and the second connecting copper sheet are all provided with a connecting hole for connecting into the working circuit.

The utility model has the advantages that:

1. the utility model provides an easily cut off fusing copper bar, through welding between first connection copper sheet and second connection copper sheet and cutting off the reed, cut off and be provided with the section notch on the reed and be formed with the cutting off point at this section notch, can make the material physics disconnection easier, guarantee the validity of cutting off, improve the reliability of product;

2. the cutting reed is provided with fusing holes close to the two end parts of the cutting reed, fusing points are formed at the narrow diameters at the two outer sides of the fusing holes, tin points are welded at the positions, corresponding to the fusing points, of the cutting reed, the melting point of the section is controlled by using a metallurgical effect, and the movement of electric arc is controlled within a certain area range, so that relatively accurate circuit breaking protection is realized, and the inside of the cutting reed after being cut meets the technical safety requirements of insulation resistance indexes;

3. the cutting reed is an alloy resistance part formed by adopting a manganese-copper alloy material, so that the cutting reed has constant resistance, can play a good role in controlling self temperature rise on the premise of meeting the requirement of loop load current, achieves lower thermal internal resistance, can be used as loop monitoring signal sampling, can shorten the response time of signal acquisition and transmission links, achieves the purpose of rapid cutting, and protects devices in a working loop.

Drawings

FIG. 1 is a perspective view of the easy-to-cut fusing copper bar of the present invention;

fig. 2 is an enlarged view of a in fig. 1 of the fuse copper bar easy to cut off.

The following description is made with reference to the accompanying drawings:

101 — first connecting copper sheet; 1011-positioning hole;

1012-positioning groove; 1013-connecting hole;

102-second connecting copper sheet; 103-cutting off the reed;

1031-cutting surface notch; 1032-cut point;

1033-fuse hole; 1034-melting point;

1035-connecting pad.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

Referring to fig. 1 and 2, the utility model provides an easily cut off fusing copper bar is applied to in the fireworks formula power-off protection switch, include: the copper connecting piece comprises a first connecting copper piece 101, a second connecting copper piece 102 and at least one cutting reed 103, wherein the cutting reed 103 is welded between the first connecting copper piece 101 and the second connecting copper piece 102.

The first connecting copper sheet 101 and the second connecting copper sheet 102 are blocks made of red copper and have the same structure. The first connecting copper sheet 101 and the second connecting copper sheet 102 are distributed in a central symmetry manner, positioning holes 1011, positioning grooves 1012 and connecting holes 1013 are arranged on the first connecting copper sheet 101 and the second connecting copper sheet 102, and the connecting holes 1013 on the first connecting copper sheet 101 and the second connecting copper sheet 102 can be conveniently accessed into an electric working loop; locating hole 1011 and positioning groove 1012 use with reference column and spacing boss cooperation in the cigarette fire formula power-off protection switch, fix a position the installation of easily cutting off fusing copper bar to two locating holes 1011 are crisscross distribution, play the installation and prevent slow-witted effect, avoid installation mistake.

Referring to fig. 2, the cutting reed 103 is provided with a cut notch 1031 in the width direction thereof, and the cutting reed 103 is provided with a cutting point 1032 at the cut notch 1031. Specifically, the cutting reed 103 is symmetrically provided with cutting surface notches 1031 at both upper and lower sides thereof, the cross section of the cutting surface notches 1031 may be V-shaped or arc-shaped, a V-shaped structure is preferably adopted in the present embodiment, and the cutting point 1032 is located between the V-shaped tips of the two cutting surface notches 1031, so that the thickness of the formed cutting point 1032 is greatly smaller than the thickness of the body of the cutting reed 103, thereby making the physical breaking of the material easier, ensuring the effectiveness of the cutting, and improving the reliability of the product.

As a preferred embodiment of the present application, two cut surface notches 1031 are arranged side by side in the width direction of the cutting reed 103, and each of the two cut surface notches 1031 has two cut points 1032 formed correspondingly and arranged oppositely up and down. This design is with piston drift and cutting drift phase-match in the cigarette formula power-off protection switch, and the piston drift uses with the cooperation of cutting drift under the gas blasting inflation effect of ignition ware, can cut off simultaneously to two cutting points 1032 on the disconnected reed 103, further guarantees to cut off the back insulation resistance requirement. It can be understood that, therefore, the cut-off points 1032 can be set to one or more according to the match-used pyrotechnic power-off protection switch and the actual working condition use requirement, and the application is not limited herein.

Continuing to refer to fig. 2, the cutting reed 103 has fusing holes 1033 near both ends thereof, and fusing points 1034 are formed at both outer narrow diameters of the fusing holes 1033, and solder dots (not shown) are welded on the cutting reed 103 corresponding to the fusing points 1034. Because tin is a low-melting-point metal, when a short circuit overload occurs in a working circuit, a tin point is heated and firstly melted, copper and tin are mutually permeated to form a copper-tin alloy with a lower melting point, so that a melting point 1034 is fused at a relatively lower temperature, the melting point of a cross section is further controlled by utilizing a metallurgical effect, the movement of an electric arc is controlled within a certain area range, relatively accurate open circuit protection is realized, and the condition that the inside of a cut reed 103 meets the technical safety requirement of an insulation resistance index after being cut is ensured.

In the embodiment, the cutting reed 103 is an alloy resistance part formed by adopting a manganese-copper alloy material, so that the cutting reed 103 has a constant resistance value, can well control the temperature rise of the cutting reed on the premise of meeting the requirement of a loop load current, achieves lower thermal internal resistance, can be used as a loop monitoring signal for sampling, can monitor the current change of a working loop by connecting the first connecting copper sheet 101 and the second connecting copper sheet 102 into the current detection unit, and can quickly and reliably cut off the cutting reed 103 by receiving a feedback detection signal and automatically controlling the pyrotechnic power-off protection switch when short circuit, heavy load current impact or accidental collision occurs, and the response time is very short, so that all devices in the working loop are protected. In addition, the cut-off reed 103 made of the material has the advantages of high resistance value precision, small external interference, short response time, strong overload capacity, high working frequency and the like, can effectively improve the long-term stability, achieves a lower temperature coefficient and copper thermal electromotive force, and realizes high-efficiency low-loss current conduction and shunt.

In a preferred embodiment of the present invention, there are three cutting blades 103, but the three cutting blades 103 are identical in structure and are arranged in parallel at intervals. The three cutting reeds 103 are respectively fixedly connected with the corresponding end parts through two connecting pieces 1035, the two connecting pieces 1035 are respectively welded on one side surface of the first connecting copper sheet 101 opposite to one side surface of the second connecting copper sheet 102, and then the three cutting reeds 103 are used for carrying out current limiting and current equalizing sampling monitoring on the working circuit. Similarly, the number of the cutting reeds 103 is not limited in this embodiment, and may be adjusted to one or more according to the actual application condition, so as to meet the use requirement.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. The utility model provides an easy cutout fusing copper bar which characterized in that includes: the copper connector comprises a first connecting copper sheet (101), a second connecting copper sheet (102) and at least one cutting reed (103) connected between the first connecting copper sheet (101) and the second connecting copper sheet (102), wherein at least one cutting surface notch (1031) is formed in the cutting reed (103), and a cutting point (1032) is formed at the position, located at the cutting surface notch (1031), of the cutting reed (103).

2. The easy-to-cut fusing copper bar as claimed in claim 1, wherein: the cutting reed (103) is provided with fusing holes (1033) near the two end parts of the cutting reed, and fusing points (1034) are formed at the two outer narrow diameters of the fusing holes (1033).

3. The easy-to-cut fusing copper bar as claimed in claim 2, wherein: and tin points are welded at the positions of the cutting reeds (103) corresponding to the melting points (1034).

4. The breakable fused copper bar according to claim 1, wherein: the upper side and the lower side of the cutting reed (103) are symmetrically provided with the cutting surface notches (1031), and the cutting point (1032) is positioned between the two cutting surface notches (1031).

5. The easy-to-cut fusing copper bar as claimed in claim 1, wherein: the cutting reed (103) is provided with two cutting surface notches (1031) in parallel along the width direction, and two corresponding cutting points (1032) are formed.

6. The easy-to-cut fusing copper bar as claimed in claim 1, wherein: the section of the cut surface notch (1031) is V-shaped or arc-shaped.

7. The breakable fused copper bar according to claim 1, wherein: the cutting reed (103) is an alloy resistance portion formed using a manganin alloy material so that the cutting reed (103) has a constant resistance value.

8. The easy-to-cut fusing copper bar as claimed in claim 1, wherein: the cutting reed (103) is provided with three cutting reeds which are distributed in parallel at intervals, the corresponding end parts of the three cutting reeds (103) are fixedly connected through two connecting pieces (1035), and the two connecting pieces (1035) are welded on the first connecting copper sheet (101) and the second connecting copper sheet (102) respectively.

9. The easy-to-cut fusing copper bar as claimed in claim 1, wherein: the first connecting copper sheet (101) and the second connecting copper sheet (102) are respectively provided with a positioning hole (1011) and a positioning groove (1012).

10. The breakable fused copper bar according to claim 1, wherein: and the first connecting copper sheet (101) and the second connecting copper sheet (102) are respectively provided with a connecting hole (1013) for connecting into a working circuit.