Multifunctional power-off collection and protection device

Abstract

The present invention discloses a multifunctional power-off data acquisition protection device, comprising: a housing, a working copper bar conductor, a cut-off piston, an ignition trigger, and a pair of first signal acquisition terminals, wherein a cut-off working chamber is arranged inside the housing; the working copper bar conductor is inserted on the housing, and at least one cut-off spring is arranged in the cut-off working chamber, and the cut-off spring is an alloy resistor part made of alloy material; the cut-off piston can be movably arranged in the cut-off working chamber and is directly above the cut-off spring; the ignition trigger is arranged on the housing, and is used to drive the cut-off piston to move to cut off the cut-off spring when triggered to start; a pair of first signal acquisition terminals are electrically connected to the two ends of the working copper bar conductor respectively. The multifunctional power-off data acquisition protection device can realize the functions of current monitoring, overload protection, circuit disconnection and temperature monitoring.

Description

Technical Field

[0001] The invention relates to the technical field of power-off protection devices, and in particular to a multifunctional power-off collection and protection device. Background Art

[0002] At present, electric vehicles generally have three electrical systems: battery, motor and electronic control. These three main components are connected through a high-speed communication bus and are the most important part of the entire electric vehicle electrical system. Among them, the battery system is mainly composed of a power battery pack and a BMS (battery management system). The power battery pack includes multiple power cells and connection devices, high-voltage distribution units, wires, etc. combined in series and parallel, while the BMS is responsible for monitoring the battery status, controlling the battery charging and discharging, and interacting the battery status information with the motor driver and the vehicle controller.

[0003] At present, the power-off protection means of the battery pack circuit breaker unit on the market is usually a solution of high-voltage relay plus high-voltage fuse. When the current is within a certain range, the relay can operate normally to control the on and off of the circuit; only under higher fault current, the fuse starts to work and cuts off the circuit current through the fuse body. This seemingly safe solution actually still has certain risks: between the working range of the high-voltage relay and the working range of the fuse, there is a gray area that is not within the range of both. When the current exceeds the working range of the relay but still does not reach the fuse breaking energy of the fuse, especially with the increase of impedance after the aging of the high-voltage fuse, the fusing response time becomes longer, which is enough to damage the relay and other circuit components, causing high-temperature fire accidents of the battery. There are also risks of battery pack short circuit, overheating, and ignition in certain extreme cases such as collisions.

[0004] Therefore, pyrotechnic power-off safety protection switches have appeared on the market, which provide protection for the circuit system in conjunction with high-voltage relays. The advantage of this is that this normally closed pyrotechnic power-off safety protection switch uses the principle of gas explosion and expansion to open the copper bar in the switch, physically disconnecting the fault circuit and eliminating component damage and heat and combustion caused by high current. This pyrotechnic power-off safety protection switch has no working range restrictions, does not consume energy during operation, is not affected by vibration, and has a validity period of up to 15 years. More importantly, compared with the high delay of traditional fuses that need to sense overload current to trigger the fuse, the pyrotechnic power-off safety protection switch can complete the circuit breaking operation within one thousandth of a second when receiving an external collision signal or a fault signal detected by the battery management system BMS.

[0005] Judging from some pure electric vehicle products on the market at this stage, in response to consumers' demand for fast charging, the development trend of electric vehicles is moving towards higher current and voltage technologies. The gradual introduction of 400V, 800V and even ultra-high voltage fast charging technologies in the laboratory demonstration stage, in addition to accelerating charging speed, also brings about higher fault currents that may be generated. Due to the reduction of internal impedance, the fault current can even reach 30,000A. In particular, when the vehicle is in emergency conditions, the instantaneous fluctuation of the current intensity can easily exceed 1000A. These situations have put forward higher requirements for the protection of batteries for new energy vehicles.

[0006] However, the existing pyrotechnic power-off safety protection switch has a relatively simple function and can only realize the function of cutting off the circuit. It is usually necessary to connect a current collection element in the working circuit for cooperation. When the current collection element collects abnormal short-circuit current in the loop, it is fed back to the battery management system BMS for judgment. The battery management system BMS then controls the pyrotechnic power-off safety protection switch to cut off the circuit. Since the high-voltage distribution unit in the power battery pack contains many components such as pyrotechnic power-off safety protection switch, relay, pre-charge resistor, current collection element, connector and wiring harness assembly, battery management system, high-voltage circuit maintenance switch, etc., the product needs to be integrated and intelligent, and the space volume is very large, which affects the energy ratio space inside the battery and directly affects the driving range, acceleration and climbing ability of electric vehicles. With the increase of components, the corresponding heat sources will also increase. With the mutual influence between the heat sources, the temperature rise will be relatively high. Overheating of components will cause insulation performance degradation, component damage, thermal aging of materials, cracking of low-melting-point welds, and solder joint shedding, thereby affecting the service life of components. Therefore, developing a power-off collection and protection device that integrates Shunt shunt current monitoring, high-voltage fuse circuit overload protection, pyrotechnic circuit breaker circuit disconnection and other functions is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0007] The problem to be solved by the present invention is to provide a multifunctional power-off collection and protection device to overcome the defects of the existing pyrotechnic power-off safety protection switch, which has a single function and requires a large number of components to be used in conjunction, resulting in mutual heat radiation influence between the components.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a multifunctional power-off collection and protection device, comprising:

[0009] A housing having a cutting working chamber disposed therein;

[0010] A working copper bar conductor is inserted into the housing, and the working copper bar conductor is located in the cutting working chamber and is provided with at least one cutting spring, and the cutting spring is an alloy resistor part made of alloy material;

[0011] A cutting piston is movably disposed in the cutting working chamber and is located directly above the cutting spring;

[0012] An ignition trigger, disposed on the housing, for driving the cut-off piston to move to cut off the cut-off reed when triggered;

[0013] A pair of first signal collection terminals are electrically connected to the two ends of the working copper busbar conductor, respectively, and are used to collect the voltage difference between the two ends of the cut-off spring when power is turned on.

[0014] As a further improvement of the present invention, at least one cutting surface notch is provided on the cutting spring piece, and a cutting point is formed at the cutting surface notch of the cutting spring piece.

[0015] As a further improvement of the present invention, a cutting punch is arranged in the cutting working chamber directly below the working copper bar conductor, and the cutting punch cooperates with the cutting piston to cut the cutting spring along the cutting point.

[0016] As a further improvement of the present invention, either the cutting piston or the cutting punch is provided with two cutting portions at the end close to the cutting spring, the two cutting portions are spaced side by side and form a punching groove therebetween, and the other is provided with a punch portion directly opposite to the punching groove; the cutting spring is provided with two cutting surface notches side by side along its width direction, and two cutting points are formed correspondingly, and the two cutting points are projected on the inner sides of the two cutting portions.

[0017] As a further improvement of the present invention, the cutting punch divides the part of the cutting working chamber located below the cutting spring into two accommodating chambers, and arc extinguishing chambers are arranged in both of the two accommodating chambers.

[0018] As a further improvement of the present invention, the cut-off spring piece is provided with fuse holes near both ends thereof, and fuse points are formed at both outer narrow diameters of the fuse holes, and the cut-off spring piece is welded with tin points corresponding to the fuse points.

[0019] As a further improvement of the present invention, it also includes a second signal acquisition terminal, on which a temperature detection probe is arranged, and the temperature detection probe is arranged on the working copper bus conductor.

[0020] As a further improvement of the present invention, a plug-in port is provided on one side of the shell, and the output ends of the first signal acquisition terminal and the second signal acquisition terminal both extend into the plug-in port.

[0021] As a further improvement of the present invention, a sealing component is arranged between the cut-off piston and the inner wall of the shell, so that a sealed gas combustion chamber is formed on the top of the cut-off piston, and the ignition trigger is located in the gas combustion chamber; a signal trigger pin is arranged on the ignition trigger, and the signal trigger pin passes through the top of the shell and protrudes to the outside.

[0022] As a further improvement of the present invention, the working copper bus conductor is further provided with two connecting copper sheets for connecting to the circuit, and three cutting spring sheets are provided, which are horizontally arranged in parallel and welded between the two connecting copper sheets.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention provides a multifunctional power-off data collection protection device, which integrates the functions of a Shunt shunt, a high-voltage fuse, a pyrotechnic power-off protection switch and a temperature collection element to form a multifunctional protection device with current monitoring, overload protection, circuit disconnection and temperature monitoring. The device can monitor the working current and temperature changes, and quickly and reliably cut off the main circuit when a short circuit, a large load current impact or an accidental collision occurs, thereby protecting the safety of each device in the circuit. At the same time, the structure is compact in design, occupies a small space, and reduces the use of components, that is, reduces the heat source of components, reduces the interaction of high-temperature radiation of components, and avoids affecting the service life of components.

[0025] 2. A cutting spring is arranged on the internal working copper busbar conductor, and the cutting spring is cut by an ignition trigger to generate gas explosion expansion to push the cutting piston to realize the breaking function; a cutting surface notch is arranged on the cutting spring and a cutting point is formed at the cutting surface notch, which can make the material physically disconnected more easily, ensure the effectiveness of the cutting, and improve the reliability of the product; the cutting spring is provided with a fuse hole near both ends thereof and a fuse point is formed at both outer narrow diameters of the fuse hole, and the cross-section melting point is controlled by metallurgical effect, so that the movement of the arc is controlled within a certain area, thereby realizing relatively accurate circuit breaking protection and ensuring that the insulation resistance index technical safety requirements are met inside the cutting spring after the cutting;

[0026] 3. The cut-off spring is an alloy resistor made of manganese-copper alloy material, so that the cut-off spring has a constant resistance value. Under the premise of meeting the loop load current requirements, it can play a good role in controlling its own temperature rise and achieve a lower thermal internal resistance. It is used in conjunction with the two first signal acquisition terminals as loop monitoring signal sampling to monitor the circuit current change, effectively shorten the response time of the signal acquisition and transmission links, and achieve the purpose of rapid cutting;

[0027] 4. By setting two second signal acquisition terminals on the working copper bus conductor to monitor the temperature in real time, once the loop device exceeds the preset temperature threshold, it can respond quickly to cut off the cut-off spring, further improving the reliability of the product and protecting the safety of each device; at the same time, the influence of the cut-off spring resistance can be corrected according to the current temperature, eliminating the loss error in the power wiring, ensuring the accuracy of the monitoring signal acquisition data, and ensuring accurate control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the multifunctional power-off data collection and protection device of the present invention;

[0029] Figure 2 This is an exploded view of the multifunctional power-off data collection and protection device of the present invention;

[0030] Figure 3 It is a cross-sectional view of the multifunctional power-off data collection and protection device of the present invention;

[0031] Figure 4 It is a three-dimensional diagram of the working copper bar conductor in the multifunctional power-off data collection and protection device of the present invention;

[0032] Figure 5 The multifunctional power-off data collection and protection device of the present invention Figure 4 A is an enlarged view of the middle image.

[0033] Combined with the attached drawings, the following description is given:

[0034] 1——housing; 101——cut-off working chamber;

[0035] 102——cut-off punch; 1021——punch head;

[0036] 103——plug port; 104——upper housing;

[0037] 105——middle shell; 106——lower shell;

[0038] 2——Working copper busbar conductor; 201——Cut-off spring;

[0039] 2011——cut surface notch; 2012——cut point;

[0040] 2013——Fuse hole; 2014——Fuse point;

[0041] 202——connect the copper sheet; 3——cut off the piston;

[0042] 301——cutting part; 302——punching groove;

[0043] 303——gas combustion chamber; 4——ignition trigger;

[0044] 401——Signal trigger pin; 5——First signal acquisition terminal;

[0045] 6——Arc extinguishing chamber; 7——Second signal acquisition terminal;

[0046] 701——temperature detection probe; 8——sealing component. DETAILED DESCRIPTION

[0047] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0048] See also Figures 1 to 5 The present invention provides a multifunctional power-off data collection protection device, comprising: a housing 1, a working copper bar conductor 2, a cut-off piston 3, an ignition trigger 4, and a pair of first signal collection terminals 5. A cut-off working chamber 101 is provided inside the housing 1, and the working copper bar conductor 2 is horizontally inserted into the housing 1, and the middle part thereof is erected in the cut-off working chamber 101. The working copper bar conductor 2 is provided with two connecting copper sheets 202 and at least one cut-off spring sheet 201 located in the cut-off working chamber 101, and the cut-off spring sheet 201 is fixedly connected between the two connecting copper sheets 202. The cut-off piston 3 can be movably arranged in the cut-off working chamber 101 up and down and is located directly above the cut-off spring sheet 201. The ignition trigger 4 is arranged on the housing 1, and is used to drive the cut-off piston 3 to move to cut off the cut-off spring sheet 201 when triggered.

[0049] Among them, the shell 1 includes an upper shell 104, a middle shell 105 and a lower shell 106, the working copper busbar conductor 2 is inserted into the middle shell 105, the upper shell 104 and the lower shell 106 are pressed on the upper and lower sides of the middle shell 105 with screws, and sealing rings are arranged between the middle shell 105 and the upper shell 104 and the lower shell 106 to ensure the sealing of the cutting working chamber 101.

[0050] See also Figure 1 , Figure 4 and Figure 5The two connecting copper sheets 202 of the working copper bus conductor 2 are blocks made of red copper. The two connecting copper sheets 202 have the same structure and are centrally symmetrically distributed. Positioning holes, positioning grooves and connecting holes are provided thereon. The connecting holes on the two connecting copper sheets 202 can be easily connected to the working circuit; the positioning holes and positioning grooves are used in conjunction with the positioning columns and limiting bosses in the middle shell 105 to position the installation of the working copper bus conductor 2, and the two positioning holes are staggered, which plays a role in preventing installation errors and avoiding installation errors.

[0051] In this embodiment, the number of cut-off springs 201 is not limited to three, and can be adjusted to one or more according to the actual application conditions to meet the use requirements. The three cut-off springs 201 have the same structure and are horizontally arranged in parallel and spaced apart. The three cut-off springs 201 are respectively fixedly connected at their corresponding ends by two connecting pieces, and the two connecting pieces are respectively welded to the opposite side surfaces of the two connecting copper pieces 202, so that the three cut-off springs 201 are used to limit the current and sample and monitor the current balancing of the working circuit. A cut-off surface notch 2011 is provided on the cut-off spring 201 along its width direction, and the cut-off spring 201 is formed at the cut-off surface notch 2011. Specifically, the cutting spring 201 is symmetrically provided with cutting surface notches 2011 on both upper and lower sides thereof. The cross section of the cutting surface notches 2011 can be V-shaped or arc-shaped. In this embodiment, a V-shaped structure is preferably adopted. The cutting spring 201 is located between the V-shaped tips of the two cutting surface notches 2011, so that the thickness of the formed cutting spring 201 is much smaller than the main body thickness of the cutting spring 201, so that the material can be physically disconnected more easily, the effectiveness of the cutting is ensured, and the reliability of the product is improved.

[0052] See also Figure 2 and Figure 3 The upper part of the cutting piston 3 is cylindrical, and an annular mounting part is provided at the inner top of the upper shell 104. The upper part of the cutting piston 3 is sleeved on the outer side of the annular mounting part, which can guide the movement of the cutting piston 3 and improve the stability of its movement. A sealing component 8 is provided between the outer side of the upper part of the cutting piston 3 and the inner wall of the upper shell 104. The sealing component 8 is a sealing ring, so that a sealed gas combustion chamber 303 is formed between the upper part of the cutting piston 3 and the annular mounting part. The ignition trigger 4 is fixed on the annular mounting part and is located in the gas combustion chamber 303. A pair of signal trigger pins 401 are provided on the ignition trigger 4, and the signal trigger pins 401 penetrate the top of the upper shell 104 and protrude to the outside. Among them, a pin mounting socket is installed at the top of the upper shell 104 at the signal trigger pin 401, so as to facilitate quick plug-in and electrical connection with an external control system.

[0053] A cutting punch 102 is provided in the cutting working chamber 101, directly below the working copper bar conductor 2. Specifically, the cutting punch 102 is formed by the lower shell 106 extending upward along the bottom of the inner cavity. The cutting punch 102 is used in conjunction with the cutting piston 3 to cut the cutting spring 201 along the cutting point 2012. The cutting piston 3 is provided with two cutting parts 301 at the end close to the cutting spring 201, and the two cutting parts 301 are arranged side by side and spaced apart to form a punching groove 302 therebetween. The cutting punch 102 is provided with a punch part 1021 facing the punching groove 302 at the end close to the cutting spring 201, and the punch part 1021 is a conical structure with slopes on both sides. As a preferred embodiment of the present application, two cutting surface notches 2011 are arranged side by side along the width direction of the cutting spring 201, and the two cutting surface notches 2011 are arranged opposite to each other up and down, and two cutting points 2012 are formed correspondingly, and the two cutting points 2012 are projected on the inner side of the two cutting parts 301. It can be understood that the design of the cutting point 2012 on the cutting spring 201 is adapted to the cutting piston 3 and the cutting punch 102. Similarly, the cutting point 2012 can also be set to three or more places, and the structures of the cutting piston 3 and the cutting punch 102 need to be adjusted accordingly, and the present application does not limit this.

[0054] When the ignition trigger 4 is triggered and started, gas explosion and expansion are generated in the gas combustion chamber 303, causing the cutting piston 3 to move downward, and the two cutting parts 301 thereon cooperate with the cutting punch 102 to cut off the two cutting points 2012 on the cutting spring 201 at the same time, and the punch part 1021 places the cut-off split part between the two cutting points 2012 in the punching groove 302, and the cut-off spring 201 is blocked by the cutting piston 3 and the cutting punch 102 to ensure the effectiveness of the cutting and the insulation performance.

[0055] The length of the cutting piston 3 and the cutting punch 102 is at least greater than the total width of the three cutting springs 201 , so as to ensure that the three cutting springs 201 can be cut simultaneously.

[0056] Similarly, the two cutting portions 301 and the punching groove 302 can also be formed on the top of the cutting punch 102; correspondingly, the punch portion 1021 is formed on the bottom of the cutting piston 3, which can also achieve the function of cutting the cutting spring 201 along the cutting point 2012.

[0057] See also Figure 3The cutting punch 102 divides the part of the cutting working chamber 101 located below the cutting spring 201 into two accommodating chambers, and both accommodating chambers are provided with arc extinguishing chambers 6. The two end parts of the cutting spring 201 after cutting are in an inverted "eight" shape under the pressure of the cutting piston 3, and the arc generated during cutting is guided into the arc extinguishing chamber 6 for extinguishing, so that there is no need to install a special arc extinguishing device to offset the arc, so that the structural design of the device can be small and compact.

[0058] See also Figure 5 The cutting spring 201 is provided with a fuse hole 2013 near both ends thereof, and a fuse point 2014 is formed at both outer narrow diameters of the fuse hole 2013. Tin points (not shown in the figure) are welded on the cutting spring 201 corresponding to the fuse points 2014. Since tin is a low melting point metal, when a short circuit overload occurs in the working circuit, the tin point is heated and melted first, and the copper and tin penetrate each other to form a copper-tin alloy with a low melting point, so that the fuse point 2014 is melted at a relatively low temperature, and then the metallurgical effect is used to control the melting point of the cross section, so that the movement of the arc is controlled within a certain area, thereby achieving relatively accurate circuit breaker protection, and ensuring that the interior of the cutting spring 201 meets the technical safety requirements of the insulation resistance index after being cut off.

[0059] In this embodiment, the cutting spring 201 is an alloy resistor part made of manganese-copper alloy material, so that the cutting spring 201 has a constant resistance value. Under the premise of meeting the loop load current requirements, it can play a good control role in its own temperature rise, achieve lower thermal internal resistance, and can be used as a loop monitoring signal sampling.

[0060] Continue reading Figure 2 and Figure 3 , the two first signal acquisition terminals 5 are electrically connected to the connecting copper sheets 202 at both ends of the working copper busbar conductor 2. The two first signal acquisition terminals 5 are both made of copper sheets, so that they are less susceptible to external electromagnetic interference, have a short response time, a high operating frequency, and a small precision numerical deviation. Specifically, one end of each of the two first signal acquisition terminals 5 is welded to the two connecting copper sheets 202, and the other end is led outward from the housing 1, which is used to access the control system to collect the pressure difference between the two ends of the cut-off spring sheet 201 when the power is turned on, thereby realizing the monitoring of the circuit current change. When abnormal conditions such as short circuit, large load current impact or accidental collision occur, the system receives the feedback detection signal and automatically controls the ignition trigger 4 to start the fast and reliable cut-off of the cut-off spring sheet 201, which can effectively shorten the response time of the signal collection and transmission link, and achieve the purpose of fast cutting. In addition, it can replace the working mode of the existing technology fuse plus current acquisition element, reduce the occupied space, make its internal layout more compact, reduce the heat source of components, and reduce the interaction of high-temperature radiation of components.

[0061] In addition, the multifunctional power-off collection and protection device of the present application is also provided with two second signal collection terminals 7, and the two second signal collection terminals 7 are provided with temperature detection probes 701, and the two temperature detection probes 701 are respectively arranged on the connecting copper sheets 202 at both ends of the working copper bus conductor 2, and are respectively used to collect the temperature at both ends of the working copper bus conductor 2. When the temperature value collected by any temperature detection probe 701 exceeds the preset temperature value of the system, the system immediately responds to the automatic control ignition trigger 4 to start the fast and reliable cutting off of the cutting spring 201, further improving the reliability of the product and protecting the safety of each device. At the same time, by collecting the temperature of the working copper bus conductor 2 through the second signal collection terminal 7, the influence of the resistance value of the cutting spring 201 can be corrected according to the current temperature, eliminating the loss error in the power routing, ensuring the accuracy of the monitoring signal collection data, and ensuring accurate control.

[0062] In this embodiment, the temperature detection probe 701 uses an NTC thermistor, which has high detection sensitivity and accuracy, can output detection data quickly, and has a short response time.

[0063] The following is an explanation of the installation structure of the first signal acquisition terminal 5 and the second signal acquisition terminal 7: a positioning groove is provided on the middle shell 105 around the outside of the cutting working chamber 101 and a plug-in port 103 is provided on one side of the positioning groove, and the two first signal acquisition terminals 5 and the two second signal acquisition terminals 7 are both accommodated in the positioning groove. The detection ends of the two first signal acquisition terminals 5 are directly welded on the connecting copper sheet 202 of the working copper bar conductor 2, and the output ends thereof extend into the plug-in port 103 to form two differential pressure data acquisition plugs. The temperature detection probes 701 on the two second signal acquisition terminals 7 are respectively adhered to the detection ends of the two first signal acquisition terminals 5, and the temperature of the working copper bar conductor 2 is indirectly detected through the first signal acquisition terminal 5. This structural design can collect data nearby and shorten the loss of signal transmission. The output ends of the two second signal acquisition terminals 7 extend into the plug-in port 103 to form three temperature data acquisition plugs, one of which is a common end, and the three temperature data acquisition plugs are located between the two differential pressure data acquisition plugs, thereby facilitating the connection and data transmission of the plug-in.

[0064] It can be seen that the multifunctional power-off data collection protection device of the present invention integrates the functions of a Shunt shunt, a high-voltage fuse, a pyrotechnic power-off protection switch and a temperature collection element into one, thereby forming a multifunctional protection device with current monitoring, overload protection, circuit disconnection and temperature monitoring. The device can monitor the working current and temperature changes, and quickly and reliably cut off the main circuit when a short circuit, a large load current shock or an accidental collision occurs, thereby protecting the safety of each device in the circuit. At the same time, the structure is compact in design, occupies little space, and reduces the use of components, that is, reduces the heat source of the components, reduces the interaction of high-temperature radiation of the components, and thus avoids affecting the service life of the components.

[0065] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A multifunctional power-off data collection and protection device, characterized in that: include: A housing (1) having a cutting working chamber (101) disposed therein; A working copper bar conductor (2) is inserted into the housing (1); the working copper bar conductor (2) is located in the cutting working chamber (101) and is provided with at least one cutting spring (201); the cutting spring (201) is an alloy resistor part made of alloy material; the cutting spring (201) is provided with a fuse hole (2013) near both ends thereof, and a fuse point (2014) is formed at both outer narrow diameters of the fuse hole (2013); and the cutting spring (201) is welded with a tin point corresponding to the fuse point (2014); A cutting piston (3) is movably disposed in the cutting working chamber (101) and is located directly above the cutting spring (201); An ignition trigger (4), arranged on the housing (1), and used to drive the cut-off piston (3) to move so as to cut off the cut-off reed (201) when triggered to start; A pair of first signal collection terminals (5), respectively electrically connected to the two ends of the working copper busbar conductor (2), and used to collect the voltage difference between the two ends of the cut-off spring sheet (201) when power is turned on; and a second signal acquisition terminal (7), wherein the second signal acquisition terminal (7) is provided with a temperature detection probe (701), the temperature detection probe (701) being arranged on the working copper busbar conductor (2) and used for collecting the temperature of the working copper busbar conductor (2), and the control system of the multifunctional power-off acquisition protection device can correct the resistance value of the cut-off spring (201) according to the temperature signal collected by the temperature detection probe (701); When an abnormal condition occurs, the control system automatically controls the ignition trigger (4) to start according to the signal collected by the first signal collection terminal (5) or the second signal collection terminal (7) to drive the cut-off piston (3) to cut off the cut-off spring (201).

2. The multifunctional power-off data collection and protection device according to claim 1 is characterized in that: At least one cutting surface notch (2011) is provided on the cutting spring piece (201), and a cutting point (2012) is formed on the cutting surface notch (2011) of the cutting spring piece (201).

3. The multifunctional power-off data collection and protection device according to claim 2 is characterized in that: A cutting punch (102) is provided in the cutting working chamber (101) directly below the working copper bar conductor (2); the cutting punch (102) cooperates with the cutting piston (3) to cut the cutting spring (201) along the cutting point (2012).

4. The multifunctional power-off data collection and protection device according to claim 3 is characterized in that: Any one of the cutting piston (3) and the cutting punch (102) is provided with two cutting portions (301) at the end close to the cutting spring sheet (201), the two cutting portions (301) are arranged side by side and spaced apart and a punching groove (302) is formed therebetween, and the other is provided with a punch portion (1021) directly opposite to the punching groove (302); the cutting spring sheet (201) is provided with two cutting surface notches (2011) side by side along its width direction, and two cutting points (2012) are formed correspondingly, and the two cutting points (2012) are directly projected on the inner sides of the two cutting portions (301).

5. The multifunctional power-off data collection and protection device according to claim 3 is characterized in that: The cutting punch (102) divides the portion of the cutting working chamber (101) located below the cutting spring sheet (201) into two accommodating chambers, and both accommodating chambers are provided with arc extinguishing chambers (6).

6. The multifunctional power-off data collection and protection device according to claim 1 is characterized in that: A plug-in port (103) is provided on one side of the housing (1), and the output ends of the first signal acquisition terminal (5) and the second signal acquisition terminal (7) both extend into the plug-in port (103).

7. The multifunctional power-off data collection and protection device according to claim 1 is characterized in that: A sealing component (8) is provided between the cut-off piston (3) and the inner wall of the housing (1), so that a sealed gas combustion chamber (303) is formed at the top of the cut-off piston (3), and the ignition trigger (4) is located in the gas combustion chamber (303); a signal trigger pin (401) is provided on the ignition trigger (4), and the signal trigger pin (401) passes through the top of the housing (1) and protrudes outside.

8. The multifunctional power-off data collection and protection device according to claim 1 is characterized in that: The working copper bar conductor (2) is also provided with two connecting copper sheets (202) for connecting to the circuit, and three cutting spring sheets (201) are provided, which are arranged horizontally in parallel and welded between the two connecting copper sheets (202).

Images