CN217048285U

CN217048285U - Signal acquisition structure for pyrotechnic power-off protection switch

Info

Publication number: CN217048285U
Application number: CN202220033584.2U
Authority: CN
Inventors: 张磊; 徐敏文; 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: 2022-07-26
Anticipated expiration: 2032-01-07

Abstract

The utility model discloses a signal acquisition structure for firework formula power-off protection switch, include: the device comprises a shell, a working copper bar conductor and a pair of first signal acquisition terminals, wherein a cutting working chamber is arranged in the shell; the working copper bar conductor is inserted into the shell, a cutting reed is arranged in the cutting working chamber of the working copper bar conductor, and the cutting reed is an alloy resistance part made of alloy materials; and the pair of first signal acquisition terminals are respectively and electrically connected with two ends of the working copper bar conductor and used for acquiring the pressure difference between two ends of the cut-off reed during electrification. This a signal acquisition structure for fireworks formula power-off protection switch can realize monitoring circuit current change, shortens response time, reaches the purpose of cutting off fast, can replace current collection component mode of operation on current fuse, and internal layout is compacter, can reduce components and parts heating source, reduces components and parts high temperature radiation interactive influence.

Description

Signal acquisition structure for pyrotechnic power-off protection switch

Technical Field

The utility model relates to a fireworks formula power-off protection switch technical field, in particular to a signal acquisition structure for fireworks formula power-off protection switch.

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 current market power-off protection means of the battery pack circuit breaking unit is generally 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 at a high fault current, the fuse starts to operate, and the circuit current is cut off through the fuse body. This seemingly conservative solution still presents a certain risk in practice: 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 of the high-voltage relay and the working range of the fuse exists, when the current exceeds the working range of the relay but 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 fire accident of the battery caused by the damage of circuit components such as the relay can be caused. 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 copper bar in the gas blasting inflation back-open switch, and physics disconnection fault circuit has stopped the components and parts damage that the high current leads to, the burning that generates heat. The pyrotechnical type power-off safety protection switch has no working range limitation, does not consume energy during working, is not influenced by vibration, and has an effective period as long as 15 years. More importantly, compared with the high delay that fusing is triggered only when the fuse of the traditional fuse needs to sense 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 existing pyrotechnic power-off safety protection switch usually needs to be connected with a current acquisition element in a working circuit for matching, when the current acquisition element acquires abnormal short-circuit current in the circuit, the abnormal short-circuit current is fed back to a Battery Management System (BMS) for judgment, and the Battery Management System (BMS) controls the pyrotechnic power-off safety protection switch to act to cut off the circuit. The mode has the advantages that the number of signal acquisition and transmission links is large, the response time is prolonged, the use number of internal components can be increased, the space volume is occupied a lot, corresponding heating sources can be increased, along with the mutual influence among the heating sources, the temperature rise of the components can be higher, the problems of insulation performance degradation, component damage, material thermal aging, low-melting-point welding seam cracking, welding spot falling and the like caused by overheating of the components can be caused, and the service life of the components is influenced. Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

The utility model aims to solve the problem that a signal acquisition structure for firework formula power-off protection switch is provided to the collection of overcoming the prior art signal leads to more the firework formula power-off protection switch response time extension, components and parts use many, can produce the defect that the heat radiation influences each other between each components and parts with the transmission link.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a signal acquisition structure for a pyrotechnic power-off protection switch, comprising:

a housing provided with a cutoff working chamber;

the working copper bar conductor is inserted into the shell, a cutting reed is arranged in the cutting working cavity and is an alloy resistance part made of alloy materials;

and the pair of first signal acquisition terminals are respectively and electrically connected with two ends of the working copper bar conductor and are used for acquiring the pressure difference between two ends of the cut-off reed when the power is on.

As a further improvement, the work copper bar electric conductor is provided with two connection copper sheets, cut off reed fixed connection and be two connect between the copper sheet.

As a further improvement, two the first signal acquisition terminal all adopts the copper sheet, and its one end difference electrical connection is two connect on the copper sheet, the other end by the casing is outwards drawn forth.

As a further improvement, the utility model also comprises a second signal acquisition terminal, be provided with temperature detection probe on the second signal acquisition terminal, temperature detection probe sets up on the work copper bar electric conductor.

As a further improvement, the second signal acquisition terminal is provided with two, sets up respectively the both ends of work copper bar electric conductor are used for right respectively the temperature at work copper bar electric conductor both ends is gathered.

As a further improvement, one side of the housing is provided with a plug port, the first signal acquisition terminal reaches the output of the second signal acquisition terminal all extends to in the plug port.

As a further improvement, the casing includes that casing and lid close down the upper cover at casing top down, be provided with the constant head tank down on the casing, first signal acquisition terminal with the second signal acquisition terminal all holds in this constant head tank.

As a further improvement of the utility model, the temperature detection probe is a thermistor.

As a further improvement of the utility model, the cutting-off reeds are provided with three parallel spaced distribution.

As a further improvement of the utility model, the cutting reed is made of manganese-copper alloy.

The beneficial effects of the utility model are that:

1. the utility model provides a signal acquisition structure for fireworks formula power-off protection switch, be provided with the cutting reed on work copper bar electric conductor, the cutting reed is the alloy resistance portion that adopts manganese-copper alloy material to make, through having connected with two first signal acquisition terminals on work copper bar electric conductor, and then realize monitoring circuit current change, not only can effectively shorten the response time of the collection of signal and transmission link, reach the purpose of quick cutting off, and can replace prior art fuse and current acquisition component mode of operation, reduce occupation space, make its internal layout compacter, can reduce the components and parts heating source, reduce components and parts high temperature radiation interaction;

2. two second signal acquisition terminals are arranged on the working copper bar conductor to monitor the temperature in real time, once a loop device exceeds a preset temperature threshold, the cutting reed can be quickly responded and cut off, the reliability of a product is further improved, and the use safety of each device is protected; meanwhile, the influence of the resistance value of the cut-off reed can be corrected according to the current temperature, loss errors in power wiring are eliminated, the accuracy of monitoring signal acquisition data is guaranteed, and the control accuracy is guaranteed.

3. Be provided with the grafting port on the casing, the output of first signal acquisition terminal and second signal acquisition terminal all extends to in the grafting port, and then makes things convenient for plug-in components to connect the transmission data.

Drawings

Fig. 1 is a perspective view of the signal acquisition structure for the pyrotechnic power-off protection switch of the present invention;

fig. 2 is an explosion diagram of the signal acquisition structure for the pyrotechnic power-off protection switch of the present invention;

fig. 3 is a cross-sectional view of the signal acquisition structure for the pyrotechnic power-off protection switch of the present invention;

fig. 4 is a perspective view of the working copper bar conductor of the present invention.

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

1-a housing; 101-cutting off the working chamber;

102 — a plug port; 103-lower shell;

1031-positioning groove; 104-upper cover;

2-working copper bar conductor; 201-cutting off the reed;

202-connecting copper sheet; 3-first signal acquisition terminal;

4-second signal acquisition terminal; 401-temperature sensing probe.

Detailed Description

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

Referring to fig. 1 to 4, the utility model provides a signal acquisition structure for firework formula power-off protection switch, include: the device comprises a shell 1, a working copper bar conductor 2 and a pair of first signal acquisition terminals 3. A cutting working chamber 101 is arranged in the shell 1, the working copper bar conductor 2 is horizontally inserted on the shell 1, and the middle part of the working copper bar conductor is arranged in the cutting working chamber 101. The working copper bar conductor 2 is provided with two connecting copper sheets 202 and a cutting reed 201 positioned in the cutting working chamber 101, and the cutting reed 201 is fixedly connected between the two connecting copper sheets 202. Two connecting copper sheets 202 are at least partially exposed at both sides of the housing 1 to facilitate access to the circuit. A cutting piston punch head and an ignition trigger which can move up and down are arranged above the cutting reed 201 in the shell 1, the ignition trigger is controlled to be started by an external power management system when short circuit abnormity occurs, and the piston punch head moves downwards under the action of gas explosion expansion of the ignition trigger to cut off the cutting reed 201, so that all components in a circuit are protected.

The cutting reed 201 is an alloy resistance part made of a manganese-copper alloy material, so that the cutting reed 201 has a constant resistance value, can well control the temperature rise of the cutting reed on the premise of meeting the requirement of the loop load current, achieves lower thermal internal resistance, and can be used as a loop monitoring signal for sampling.

Referring to fig. 2 and 3, two first signal collecting terminals 3 are electrically connected to the connecting copper sheets 202 at two ends of the working copper bar conductor 2, respectively. Two first signal acquisition terminals 3 all adopt the copper sheet for receive external electromagnetic interference little, and response time is short, and operating frequency is high, and precision numerical value deviation is little. The respective one end of two first signal acquisition terminals 3 welds respectively on two connection copper sheets 202, the other end is outwards drawn forth by casing 1 for connect in the power management system and cut off the pressure differential at reed 201 both ends when circular telegram and gather, and then realize the monitoring to circuit current change, when the short circuit appears, heavy load current strikes, or unexpected collision, the detection signal of system reception feedback and automatic control cigarette fire formula power off protection switch are quick, reliable cuts off reed 201, can effectively shorten the collection of signal and the response time of transmission link, reach the purpose of quick cut-off. In addition, through having the signal acquisition function with the integrated signal acquisition function of pyrotechnic power-off protection switch, can replace prior art fuse and add current acquisition component mode, reduce occupation space, make its inside overall arrangement compacter, can reduce components and parts source that generates heat, reduce components and parts high temperature radiation interaction.

Referring to fig. 4, as a preferred embodiment of the present application, there are three cutting reeds 201, and the three cutting reeds 201 have the same structure and are arranged in parallel and spaced apart from each other. The three cut-off reeds 201 are respectively fixedly connected with the corresponding end parts through two connecting pieces, the two connecting pieces are respectively welded on one side face, opposite to the two connecting copper sheets 202, of the circuit, and then the current limiting and current sharing sampling monitoring is carried out on the circuit through the three cut-off reeds 201.

Continuing to refer to fig. 2 and fig. 3, this application is used for fireworks formula power-off protection switch's signal acquisition structure still includes two second signal acquisition terminals 4, all is provided with temperature detection probe 401 on two second signal acquisition terminals 4, and two temperature detection probe 401 set up respectively on the connection copper sheet 202 at work copper bar electric conductor 2 both ends, are used for gathering the temperature at work copper bar electric conductor 2 both ends respectively. When the temperature value acquired by any temperature detection probe 401 exceeds the preset temperature value of the system, the system immediately responds to the automatic control pyrotechnic power-off protection switch to quickly cut off the cut-off reed 201, so that the reliability of the product is further improved, and the use safety of each device is protected. In addition, the temperature of the working copper bar conductor 2 is collected through the second signal collecting terminal 4, the resistance influence of the cut-off reed 201 can be corrected according to the current temperature, loss errors in power wiring are eliminated, the accuracy of monitoring signal collecting data is guaranteed, and the accuracy of control is guaranteed.

In this embodiment, the temperature detection probe 401 employs an NTC thermistor, which has high detection sensitivity and accuracy, can output detection data quickly, and has a short response time.

The following description is made of the mounting structure of the first signal collecting terminal 3 and the second signal collecting terminal 4: the housing 1 includes a lower housing 103 and an upper cover 104 covering the top of the lower housing 103, a positioning groove 1031 is provided on the lower housing 103 around the outside of the cutting-off working chamber 101 and an insertion port 102 is provided on one side of the positioning groove 1031, and the two first signal collecting terminals 3 and the two second signal collecting terminals 4 are all accommodated in the positioning groove 1031. The detection ends of the two first signal acquisition terminals 3 are directly welded on the connecting copper sheet 202 of the working copper bar conductor 2, and the output ends of the two first signal acquisition terminals extend to the insertion port 102 to form two differential pressure data acquisition insertion sheets. Temperature detection probe 401 on two second signal acquisition terminals 4 adheres respectively on two first signal acquisition terminal 3's the sense terminals, carries out temperature detection to work copper bar electric conductor 2 through first signal acquisition terminal 3 is indirect, and this structural design can gather nearby, shortens signal transmission's loss. The output ends of the two second signal acquisition terminals 4 extend to the insertion port 102 to form three temperature data acquisition insertion pieces, one of the three temperature data acquisition insertion pieces is a public end, and the three temperature data acquisition insertion pieces are located between the two pressure difference data acquisition insertion pieces, so that the insertion pieces can be conveniently connected with transmission data.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms and is therefore not limited to the specific embodiments disclosed above. While the invention has been described with reference to specific embodiments, it will be apparent to one skilled in the art that various changes and modifications can be made, and equivalents employed, 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. A signal acquisition structure for a pyrotechnic power-off protection switch, comprising:

a housing (1) provided with a cutting work chamber (101);

the working copper bar conductor (2) is inserted into the shell (1), the working copper bar conductor (2) is positioned in the cutting working chamber (101) and is internally provided with a cutting reed (201), and the cutting reed (201) is an alloy resistance part made of alloy materials;

and the pair of first signal acquisition terminals (3) are respectively and electrically connected with two ends of the working copper bar conductor (2) and are used for acquiring the pressure difference between two ends of the cut-off reed (201) during electrification.

2. The signal acquisition structure for the pyrotechnic power-off protection switch as claimed in claim 1, wherein: the working copper bar conductor (2) is provided with two connecting copper sheets (202), and the cutting reed (201) is fixedly connected between the two connecting copper sheets (202).

3. The signal acquisition structure for the pyrotechnic power-off protection switch as claimed in claim 2, wherein: the two first signal acquisition terminals (3) are made of copper sheets, one ends of the copper sheets are respectively and electrically connected to the two connecting copper sheets (202), and the other ends of the copper sheets are led out from the shell (1).

4. The signal collection structure for a pyrotechnic power-off protection switch as claimed in claim 1, wherein: the temperature detection device is characterized by further comprising a second signal acquisition terminal (4), wherein a temperature detection probe (401) is arranged on the second signal acquisition terminal (4), and the temperature detection probe (401) is arranged on the working copper bar conductor (2).

5. The signal acquisition structure for the pyrotechnic power-off protection switch as claimed in claim 4, wherein: the two second signal acquisition terminals (4) are respectively arranged at two ends of the working copper bar conductor (2) and are respectively used for acquiring the temperature at two ends of the working copper bar conductor (2).

6. The signal collection structure for a pyrotechnic power-off protection switch as claimed in claim 4, wherein: one side of the shell (1) is provided with an inserting port (102), and the output ends of the first signal acquisition terminal (3) and the second signal acquisition terminal (4) extend into the inserting port (102).

7. The signal acquisition structure for the pyrotechnic power-off protection switch as claimed in claim 4, wherein: the shell (1) comprises a lower shell (103) and an upper cover (104) covering the top of the lower shell (103), a positioning groove (1031) is formed in the lower shell (103), and the first signal acquisition terminal (3) and the second signal acquisition terminal (4) are accommodated in the positioning groove (1031).

8. The signal acquisition structure for the pyrotechnic power-off protection switch as claimed in claim 4, wherein: the temperature detection probe (401) is a thermistor.

9. The signal acquisition structure for the pyrotechnic power-off protection switch as claimed in claim 1, wherein: the three cutting reeds (201) are arranged in parallel at intervals.

10. The signal collection structure for a pyrotechnic power-off protection switch as claimed in claim 1, wherein: the cutting reed (201) is made of manganese-copper alloy.