Circuit breaker protection system

Abstract

The invention discloses a circuit breaker protection system, which comprises a conductor and a pyrotechnic circuit breaker arranged on the conductor, the pyrotechnic circuit breaker can form an open circuit on the conductor when being driven, and the circuit breaker protection system further comprises a shell part, a control unit and a current detection unit. Wherein the shell part is installed on the pyrotechnic type circuit breaker, the shell part at least comprises an extension part, and the extension part extends towards the conductor along the side wall of the pyrotechnic type circuit breaker and is connected with the pyrotechnic type circuit breaker in a matched mode; the control unit is arranged on the shell part, is connected with the pyrotechnic type circuit breaker and is used for driving the pyrotechnic type circuit breaker; the current detection unit is arranged along the extension part and is connected with the control unit, and the detection end of the current detection unit is connected with the conductor; wherein the control unit detects a current signal on the conductor through the current detection unit, and drives the firework type circuit breaker to disconnect the conductor after judging that the conductor is overloaded based on the current signal. According to the invention, the integration level is high, and the problems of slow reaction speed and low reliability of the existing hot-melt fuse are solved.

Description

Technical Field

[0001] The invention relates to the technical field of line protection, and in particular to a circuit breaker protection system. Background Art

[0002] In the protection system of the battery pack, if the battery pack is hit, overloaded, or has insulation failure, it is necessary to cut off the circuit system of the battery pack through a circuit breaker, such as using a fuse to disconnect the bus.

[0003] In the prior art, a thermal cutoff fuse is usually used to cut off the circuit system of a battery pack. The thermal cutoff fuse has a slow reaction speed, cannot cut off the current immediately, has low controllability, and its performance gradually deteriorates over time.

[0004] Based on this, a new technical solution is needed. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a circuit breaker protection system to at least solve the problem of slow response speed and low controllability of thermal cutoff fuses in the prior art.

[0006] The embodiment of the present invention provides the following technical solutions:

[0007] An embodiment of the present invention provides a circuit breaker protection system, comprising a conductor and a pyrotechnic circuit breaker disposed on the conductor, wherein the pyrotechnic circuit breaker can cause a circuit to be broken on the conductor when driven, and the circuit breaker protection system further comprises:

[0008] a shell portion, the shell portion being mounted on the pyrotechnic circuit breaker, the shell portion comprising at least an extension portion, the extension portion extending along a side wall of the pyrotechnic circuit breaker toward the conductor and being cooperatively connected with the pyrotechnic circuit breaker;

[0009] a control unit, the control unit being disposed on the shell and connected to the pyrotechnic circuit breaker and configured to drive the pyrotechnic circuit breaker;

[0010] a current detection unit, the current detection unit being arranged along the extension portion, the current detection unit being connected to the control unit, and a detection end thereof being connected to the conductor;

[0011] The control unit detects the current signal on the conductor through the current detection unit, and drives the pyrotechnic circuit breaker to disconnect the conductor after determining that the conductor is overloaded based on the current signal.

[0012] Further, the shell is a hollow cavity structure, the control unit is arranged in the hollow cavity of the shell, and is connected to the pyrotechnic circuit breaker through a first connector;

[0013] The shell portion includes a shell and a cover plate buckled on the shell, a support portion for supporting the control unit is provided in the shell, and an extension portion is connected to a side wall of the shell;

[0014] The cover plate is provided with a plurality of limiting portions extending into the housing, and the plurality of limiting portions are used to cooperate with the supporting portion to limit the control unit.

[0015] Furthermore, the cover plate includes a plurality of limit buckles extending toward the housing, and each of the limit buckles is provided with a limit slot;

[0016] The inner wall of the shell is provided with a plurality of limiting protrusions corresponding to the plurality of limiting buckles, and the plurality of limiting protrusions are used to enter the corresponding limiting buckle grooves when the cover plate is buckled on the shell.

[0017] Furthermore, the shell portion includes a plurality of avoidance portions, and the plurality of avoidance portions are used to avoid protruding portions on the pyrotechnic circuit breaker when the shell portion is installed on the pyrotechnic circuit breaker.

[0018] Furthermore, slide blocks are provided on both sides of the extension portion, and the slide blocks slide and are interference-connected with guide rails provided on the side walls of the pyrotechnic circuit breaker so as to install the shell portion on the pyrotechnic circuit breaker.

[0019] Furthermore, the extension portion is a hollow structure with a groove, the hollow cavity of the extension portion is communicated with the hollow cavity of the shell, and the current detection unit is arranged along the internal cavity or the groove of the extension portion.

[0020] Further, the extension portion is one, the current detection unit comprises a second connector and a current detection element, one end of the second connector is connected to the control unit, and the other end extends along the groove of the extension portion close to the conductor, the current detection element is arranged at the other end of the second connector and connected to the conductor to detect the current signal of the conductor;

[0021] When the control unit detects that the current signal is overloaded, the pyrotechnic circuit breaker is driven to disconnect the conductor.

[0022] Furthermore, there are two extension parts, which are located on both sides of the housing and the pyrotechnic circuit breaker, and the current detection unit includes two spring pieces, one end of each of the two spring pieces is connected to the control unit, and the other ends of the two spring pieces extend along the hollow cavity of the extension part respectively, and are connected to the upstream end and the downstream end of the conductor located on both sides of the pyrotechnic circuit breaker;

[0023] Wherein, when the control unit detects through the two spring pieces that the voltage drop between the upstream end and the downstream end of the conductor reaches a threshold value, the control unit drives the pyrotechnic circuit breaker to disconnect the conductor.

[0024] Furthermore, the spring piece includes a straight section and a bent section, the straight section is located in the hollow cavity of the extension portion, and the bent section extends from the straight section into the hollow cavity of the shell;

[0025] Among them, a plane segment is formed at the end of the straight segment close to the conductor and the end of the bent segment close to the control unit. The plane segment at the end of the straight segment is in close contact with the conductor, and the plane segment of the bent segment is in close contact with the conductive area reserved on the control unit.

[0026] Furthermore, the circuit breaker protection system further comprises:

[0027] A communication unit is integrated on the control unit, and is used to send an acquired external control signal to the control unit, and the control unit drives the pyrotechnic circuit breaker according to the external control signal.

[0028] Compared with the prior art, the at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0029] A circuit breaker protection system of the present invention, wherein the shell is arranged on the pyrotechnic circuit breaker through an extension part, the extension part extends toward the conductor along the side wall of the pyrotechnic circuit breaker and is connected with the pyrotechnic circuit breaker in cooperation, the current detection unit is arranged on the extension part, and the control unit is arranged on the shell part, so that the circuit breaker protection system is more compact in structure and the integration of the circuit breaker protection system is improved;

[0030] Furthermore, the control unit detects the current signal on the conductor through the current detection unit, and drives the pyrotechnic circuit breaker to disconnect the conductor after determining that the conductor is overloaded based on the current signal, thereby solving the problems of slow response speed and low reliability of the existing thermal cutoff fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a structural schematic diagram of a circuit breaker protection system of the present invention;

[0033] Figure 2An exploded view of a first embodiment of a circuit breaker protection system of the present invention;

[0034] Figure 3 is a cross-sectional view of a first embodiment of a circuit breaker protection system of the present invention;

[0035] Figure 4 An exploded view of a second embodiment of a circuit breaker protection system of the present invention;

[0036] Figure 5 is a cross-sectional view of a second embodiment of a circuit breaker protection system of the present invention;

[0037] Figure 6 A circuit control schematic diagram of a circuit breaker protection system of the present invention (I);

[0038] Figure 7 A circuit control schematic diagram of a circuit breaker protection system of the present invention (II);

[0039] Figure 8 A circuit control schematic diagram of a circuit breaker protection system of the present invention (III);

[0040] Fig. 9 This is a circuit control schematic diagram of a circuit breaker protection system of the present invention (IV).

[0041] The accompanying drawings of the present invention are as follows:

[0042] 10. Conductor; 20. Smoke and pyrotechnic circuit breaker; 21. Guide rail; 30. Shell; 31. Extension; 311. Slider; 312. Groove; 32. Shell; 321. Support; 322. Limiting protrusion; 33. Cover; 331. Limiting portion; 332. Limiting buckle; 333. Limiting slot; 34. Avoiding portion; 40. Control unit; 50. Current detection unit; 51. Second connector; 52. Current detection element; 53. Shrapnel; 531. Straight segment; 532. Bend segment; 533. Plane segment; 60. First connector; 70. Communication unit. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0044] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0045] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0046] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0047] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0048] In the design and use of electric vehicles, the safety of the power battery pack is always an important factor that needs to be considered. When an accident occurs, it is necessary to cut off the bus structure in the battery pack in a very short time to avoid aggravating the severity of the accident due to battery short circuit.

[0049] At present, the method for electric vehicles to quickly cut off the battery connection structure usually adopts a thermal cutoff fuse and a battery management system to detect the current and control the cutoff. Although the above method can protect the battery pack to a certain extent, it has many shortcomings, such as the slow reaction speed of the thermal cutoff fuse, the inability to cut off the current in the first time, the low controllability, the gradual decline in performance over time, the increase in the safety risk of the circuit breaker, the complex structure of the device, and the easy occurrence of failures.

[0050] In the prior art, a battery management system (BMS) is also used to control a pyrotechnic circuit breaker, and the pyrotechnic circuit breaker is used to disconnect the busbar. However, when the battery management system controls the pyrotechnic circuit breaker, its structure is relatively complex. When it is applied to a car, it increases its control risk as it is used for a long time. In addition, the existing pyrotechnic circuit breaker has a single control source and must rely on the battery management system and cannot exist independently.

[0051] Based on this, this specification embodiment proposes a processing solution: Figures 1 to 5 As shown, a circuit breaker protection system of the present invention uses a shell 30 to integrate a control unit 40 and a current detection unit 50 into a pyrotechnic circuit breaker 20, thereby improving the integration of the circuit breaker protection system to cope with the trend of increasing integration of existing new energy vehicles;

[0052] Furthermore, the control unit 40 detects the current signal on the conductor 10 through the current detection unit 50, and drives the pyrotechnic circuit breaker 20 to disconnect the conductor 10 after determining that the conductor 10 is overloaded based on the current signal, thereby solving the problems of slow response and low controllability of the existing thermal melt circuit breaker, and solving the problem that the existing pyrotechnic circuit breaker can only rely on BMS control and drive.

[0053] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0054] like Figures 1 to 5 As shown, a circuit breaker protection system of the present invention comprises a conductor 10 and a pyrotechnic circuit breaker 20 disposed on the conductor 10 . The pyrotechnic circuit breaker 20 can form a circuit break on the conductor 10 when driven.

[0055] The conductor 10 may be a conductive body such as a wire or a bus bar.

[0056] For example, when the conductor 10 is a busbar, the pyrotechnic circuit breaker 20 is mounted on the busbar so as to disconnect the busbar and short-circuit the busbar when the pyrotechnic circuit breaker 20 is driven.

[0057] The circuit breaker protection system further includes a shell 30, a control unit 40 and a current detection unit 50. The shell 30 is mounted on the pyrotechnic circuit breaker 20, and the shell 30 at least includes an extension 31, which extends along the side wall of the pyrotechnic circuit breaker 20 toward the conductor 10 and is connected to the pyrotechnic circuit breaker 20; the control unit 40 is arranged on the shell 30 and connected to the pyrotechnic circuit breaker 20 for driving the pyrotechnic circuit breaker 20; the current detection unit 50 is arranged along the extension 31, the current detection unit 50 is connected to the control unit 40, and its detection end is connected to the conductor 10; the control unit 40 detects the current signal on the conductor 10 through the current detection unit 50, and drives the pyrotechnic circuit breaker 20 to disconnect the conductor 10 after judging that the conductor 10 is overloaded based on the current signal.

[0058] The shell 30 may be a solid or hollow structure, and the extension portion 31 extends outward from the side wall of the shell 30 .

[0059] After the extension portion 31 is connected with the pyrotechnic circuit breaker 20 , the extension portion 31 can fix the housing 32 to the pyrotechnic circuit breaker 20 .

[0060] The connection between the extension portion 31 and the pyrotechnic circuit breaker 20 includes common connection methods such as snap connection, plug connection, and pasting.

[0061] The control unit 40 may be disposed outside the shell 30 or inside the hollow structure, and it mainly performs signal transmission and logic control functions.

[0062] The control unit 40 is used to obtain the current signal detected by the current detection unit 50 and determine whether to drive the pyrotechnic circuit breaker 20 according to the current signal.

[0063] Specifically, the control unit 40 includes a circuit board, an operational amplifier circuit integrated on the circuit board, and a control circuit, etc. The operational amplifier circuit is used to amplify the current signal, and the control circuit is used to determine whether to drive the pyrotechnic circuit breaker 20 according to the current signal.

[0064] The current detection unit 50 may be disposed along the extension portion 31 on the outside of the extension portion 31 or in the internal cavity of the extension portion 31 .

[0065] Specifically, the current detection unit 50 includes a connection end, an extension section, and a detection end which are arranged in sequence. The connection end is used to be electrically connected to the control unit 40; the extension section is arranged along the extension direction of the extension portion 31 to be close to the conductor 10; and the detection end is connected to the conductor 10 to detect the current signal on the conductor 10.

[0066] In the present application, the extension portion 31 is used to mount the housing portion 30 onto the pyrotechnic circuit breaker 20 and to mount the current detection unit 50 .

[0067] The present application improves the overall integration of the circuit breaker protection system by integrating the control unit 40 and the current detection unit 50 into the shell 30 respectively, and the shell 30 is installed on the pyrotechnic circuit breaker 20 through the extension portion 31, and the control unit 40 drives the pyrotechnic circuit breaker 20 according to the current signal of the current detection unit 50, thereby realizing self-driving of the circuit breaker protection system.

[0068] Furthermore, the shell 30 is a hollow cavity structure, the control unit 40 is disposed in the hollow cavity of the shell 30 , and is connected to the pyrotechnic circuit breaker 20 via the first connector 60 .

[0069] By installing the control unit 40 in the shell 30 , the control unit 40 can be protected to prevent the control unit 40 from being damaged by external devices.

[0070] Specifically, the shell portion 30 also includes a shell 32 and a cover plate 33 buckled on the shell 32, a support portion 321 for supporting the control unit 40 is provided in the shell 32, and an extension portion 31 is connected to the side wall of the shell 32; a plurality of limiting portions 331 extending into the shell 32 are provided on the cover plate 33, and the plurality of limiting portions 331 are used to cooperate with the support portion 321 to limit the control unit 40.

[0071] The support portion 321 is disposed in the hollow cavity of the shell 32 to support the control unit 40 and keep the control unit 40 stable.

[0072] For example, the support portion 321 may be a plurality of support columns or support steps disposed on the inner wall of the housing 32 .

[0073] Among them, the limiting portion 331 is arranged on a side of the cover plate 33 facing the shell 32, and is used to press the control unit 40 when the control unit 40 is placed on the supporting portion 321, so that the control unit 40 is fixed by the limiting portion 331 and the supporting portion 321, thereby preventing the control unit 40 from jumping or displacing due to vibration.

[0074] The limiting portion 331 may be a plurality of limiting columns or limiting steps disposed on the cover plate 33 .

[0075] In some of the embodiments, the portions of the limiting portion 331 and the supporting portion 321 that are in contact with the control unit 40 are flexibly configured to avoid damaging the control unit 40 , such as soft pads are provided at the ends of the limiting portion 331 and the supporting portion 321 .

[0076] The present application disposes the control unit 40 in the central control cavity of the shell 32, and uses the support part 321 and the limit part 331 to limit the control unit 40, so that the control unit 40 is stably installed in the shell 32, avoiding displacement or jumping due to vibration when it is installed on the car.

[0077] Furthermore, the cover plate 33 includes a plurality of limit buckles 332 extending toward the shell 32, and each limit buckle 332 is provided with a limit slot 333; the inner wall of the shell 32 is provided with a plurality of limit protrusions 322 corresponding to the plurality of limit buckles 332, and the plurality of limit protrusions 322 are used to enter the corresponding limit slots 333 when the cover plate 33 is buckled on the shell 32.

[0078] The limiting buckle 332 is used to fix the cover plate 33 to the shell 32 by using the limiting groove 333 to cooperate with the limiting protrusion 322 on the inner wall of the shell 32 to reduce the difficulty of installing the cover plate 33.

[0079] When the cover plate 33 is buckled onto the housing 32 so that the limiting protrusion 322 enters the corresponding limiting slot 333 , the limiting portion 331 can just abut against the control unit 40 to position the control unit 40 .

[0080] Preferably, a plurality of limiting buckles 332 are respectively disposed on the four edges of the cover plate 33 , and a limiting slot 333 is disposed on each limiting buckle 332 .

[0081] The cover plate 33 of the present application can be simply and quickly installed on the housing 32 through the limiting buckle 332, the limiting slot 333 and the limiting protrusion 322, so that the overall structure of the circuit breaker protection system is easier to install.

[0082] Furthermore, the shell 30 includes a plurality of avoidance portions 34 , which are used to avoid protruding portions on the pyrotechnic circuit breaker 20 when the shell 30 is installed on the pyrotechnic circuit breaker 20 , so as to facilitate the installation of the shell 30 on the pyrotechnic circuit breaker 20 .

[0083] For example, the avoidance portion 34 is used to avoid protruding parts such as bolts and connection ports on the pyrotechnic short circuit device.

[0084] Preferably, the housing 32 of the shell portion 30 is configured as a cross-shaped structure to avoid bolts on the four corners of the pyrotechnic circuit breaker 20 .

[0085] The bottom end of the housing 32 is also provided with a through hole to avoid the connection port on the pyrotechnic circuit breaker 20 .

[0086] The present application uses the avoidance portion 34 to avoid the protruding portion on the pyrotechnic circuit breaker 20 , so that the shell 30 can be installed on the pyrotechnic circuit breaker 20 more compactly without changing the structure of the pyrotechnic circuit breaker 20 .

[0087] Furthermore, slide blocks 311 are provided on both sides of the extension portion 31 , and the slide blocks 311 are slidably engaged with guide rails 21 provided on the side wall of the pyrotechnic circuit breaker 20 , so as to install the housing 30 on the pyrotechnic circuit breaker 20 .

[0088] The slider 311 on the extension 31 cooperates with the guide rail 21 on the side wall of the pyrotechnic circuit breaker 20 so that when the extension 31 slides along the side wall of the pyrotechnic circuit breaker 20 , the slider 311 can slide into the guide rail 21 to install the shell 30 on the pyrotechnic circuit breaker 20 .

[0089] Preferably, the slider 311 and the guide rail 21 are in interference connection, so that the extension portion 31 can be clamped on the pyrotechnic circuit breaker 20 .

[0090] For example, the size of the slider 311 gradually decreases from top to bottom, and the size of the upper portion of the slider 311 is larger than the size of the guide rail 21, so that the slider 311 is interference-connected with the guide rail 21 when it is fully inserted into the guide rail.

[0091] The present application uses a slider 311 and a guide rail 21 to mount the extension portion 31 on the side wall of the pyrotechnic circuit breaker 20 , thereby reducing the difficulty of mounting the extension portion 31 on the pyrotechnic circuit breaker 20 .

[0092] Furthermore, the extension portion 31 is a hollow structure with a groove 312 , the hollow cavity of the extension portion 31 is connected to the hollow cavity of the shell 32 , and the current detection unit 50 is arranged along the inner cavity or the groove 312 of the extension portion 31 .

[0093] In some of the embodiments, there is one extension portion 31, and the current detection unit 50 includes a second connector 51 and a current detection element 52. One end of the second connector 51 is connected to the control unit 40, and the other end extends along the groove 312 of the extension portion 31 close to the conductor 10. The current detection element 52 is arranged at the other end of the second connector 51 and connected to the conductor 10 to detect the current signal of the conductor 10; wherein, when the control unit 40 detects that the current signal is overloaded, it drives the pyrotechnic circuit breaker 20 to disconnect the conductor 10.

[0094] The second connector 51 is a flexible connector, and the second connector 51 is disposed along the groove 312 of the extending portion 31 . The groove 312 on the extending portion 31 is disposed along the extending direction of the extending portion 31 .

[0095] The groove 312 on the extension portion 31 is arranged on the side wall of the extension portion 31 facing the pyrotechnic circuit breaker 20, so that when the second connector 51 is embedded in the groove 312, the second connector 51 is limited between the extension portion 31 and the side wall of the pyrotechnic circuit breaker 20, so as to protect the second connector 51 and prevent it from being exposed to the outside.

[0096] The current detection element 52 is a Hall current sensor, and is located at the downstream end of the conductor 10 . The distance between the current detection element 52 and the conductor 10 is 3.5 mm.

[0097] Furthermore, a slot for mounting the current detection element 52 is provided at one end of the extension portion 31 close to the conductor 10 .

[0098] In this embodiment, the current detection element 52 is at a preset distance from the conductor 10 so that the current detection element 52 can detect the current signal on the conductor 10, and after the current detection element 52 detects the current signal on the conductor 10, the current signal is sent to the control unit 40. When the control unit 40 detects that the current signal exceeds the preset current threshold, it drives the pyrotechnic circuit breaker 20 to disconnect the conductor 10.

[0099] The end of the second connector 51 connected to the control unit 40 is the connection end of the current detection unit 50 , the length portion of the second connector 51 is the extension section of the current detection unit 50 , and the current detection element 52 is the detection end of the current detection unit 50 .

[0100] The working principle of this embodiment is that the current detection element 52 electrically connected to the conductor 10 detects the current signal flowing through the conductor 10, and transmits it to the control unit 40 through the second connector 51. When the control unit 40 detects that the current signal detected by the current detection element 52 exceeds a preset threshold, the control unit 40 outputs a signal, which is transmitted to the pyrotechnic circuit breaker 20 through the first connector 60, driving the pyrotechnic circuit breaker 20 to operate to disconnect the conductor 10.

[0101] In some of the embodiments, there are two extension portions 31, which are located on both sides of the housing 32 and the pyrotechnic circuit breaker 20, and the current detection unit 50 includes two spring clips 53, one end of each of the two spring clips 53 is connected to the control unit 40, and the other ends of the two spring clips 53 extend along the hollow cavity of the extension portion 31, and are connected to the upstream end and the downstream end of the conductor 10 located on both sides of the pyrotechnic circuit breaker 20; wherein, when the control unit 40 detects through the two spring clips 53 that the voltage drop between the upstream end and the downstream end of the conductor 10 reaches a threshold value, the control unit 40 drives the pyrotechnic circuit breaker 20 to disconnect the conductor 10.

[0102] When there are two extensions 31 , the two extensions 31 can be clamped on both sides of the pyrotechnic circuit breaker 20 to more stably install the housing 32 on the pyrotechnic circuit breaker 20 , thereby increasing the stability of the housing 32 installed on the pyrotechnic circuit breaker 20 .

[0103] One end of the spring sheet 53 close to the conductor 10 is electrically connected to the upstream end or the downstream end of the conductor 10 , so that the spring sheet 53 can be connected in parallel to the conductor 10 .

[0104] The spring sheet 53 is installed in the hollow cavity of the extension portion 31 , thereby preventing the current on the spring sheet 53 from affecting the external structure or the pyrotechnic circuit breaker 20 .

[0105] The spring piece 53 is made of conductive material.

[0106] Specifically, the spring piece 53 includes a straight segment 531 and a bent segment 532, the straight segment 531 is located in the hollow cavity of the extension portion 31, and the bent segment 532 extends from the straight segment 531 into the hollow cavity of the shell 32; wherein, a plane segment 533 is formed at the end of the straight segment 531 close to the conductor 10 and the end of the bent segment 532 close to the control unit 40, the plane segment 533 at the end of the straight segment 531 is in close contact with the conductor 10, and the plane segment 533 of the bent segment is in close contact with the conductive area reserved on the control unit 40.

[0107] The plane section 533 at the end of the bending section 532 constitutes the connection end of the current detection unit 50 , the length portion of the bending section 532 and the straight section 531 constitutes the extension section of the current detection unit 50 , and the plane section 533 at the end of the straight section 531 constitutes the detection end.

[0108] Specifically, the end of the bent segment 532 and the end of the straight segment 531 are both turned outward to form the plane segment 533 .

[0109] The working principle of this embodiment is that when a large current passes through two metal springs 53 electrically connected to the conductor 10 (such as a bus) respectively, the two metal springs 53 will generate a voltage of mV level. After the isolation operational amplifier chip on the control unit 40 detects the voltage drop, it is transmitted to the control unit 40. When the detected voltage exceeds the threshold, it means that the current on the conductor 10 exceeds the limit. At this time, the control unit 40 outputs a signal, which is transmitted to the pyrotechnic circuit breaker 20 by the first connector 60 connecting the control unit 40 and the pyrotechnic circuit breaker 20, so as to drive the pyrotechnic circuit breaker 20 to operate and realize the protection function.

[0110] In this embodiment, the control device is located on the pyrotechnic circuit breaker 20, and the housing of the control device has two extensions 31. The extensions 31 are integrated with the pyrotechnic circuit breaker 20 through the guide rails 21 on the pyrotechnic circuit breaker 20 to improve the overall integration of the system.

[0111] In some embodiments, the circuit breaker protection system further includes a communication unit 70, which is integrated on the control unit 40. The communication unit 70 is used to send the acquired external control signal to the control unit 40, and the control unit 40 drives the pyrotechnic circuit breaker 20 according to the external control signal.

[0112] The communication unit 70 may obtain a control signal sent by a battery management system (BMS), and the control unit 40 may drive the pyrotechnic circuit breaker 20 to disconnect the conductor 10 according to the control signal sent by the battery management system.

[0113] The communication unit 70 may also send a signal to the outside, such as sending a current signal detected by the current detection unit 50 to the BMS or the control unit 40 .

[0114] Specifically, the connection port of the communication unit 70 is led out and installed in the groove 312 opened on the cover plate 33 .

[0115] In some of the embodiments, the circuit breaker protection system further includes a power interface, which is used to connect to an external power source to power the control unit 40 , and the power interface is led out to the cover plate 33 .

[0116] like Figures 6 to 9 As shown, the circuit breaker protection system of the present application can drive the pyrotechnic circuit breaker 20 solely by the current detection unit 50 and the control unit 40, or can drive the pyrotechnic circuit breaker 20 solely by the control unit 40 and the communication unit 70, and can also have both self-driving and external signal driving capabilities.

[0117] For example, Figures 7 to 9 As shown, Figures 7 to 9 The three triggering schemes of this application are as follows: Figure 7 It is a self-triggering solution, which includes a current detection unit 50, a control unit 40, and a pyrotechnic circuit breaker 20, and can achieve the detonation of the PBD by relying on its own detection and control; Figure 8 It is an external triggering scheme, which includes a control unit 40, a communication unit 70, and a pyrotechnic circuit breaker 20, and needs to receive a current overload signal from the BMS to realize the detonation of the PBD; Fig. 9In order to be compatible with the combination of self-triggering and external triggering, it includes a current detection unit 50, a control unit 40, a communication unit 70, and a pyrotechnic circuit breaker 20, which can realize the ignition of the PBD by itself or the BMS signal. Different solutions of the present application can be selected according to the needs.

[0118] The circuit breaker protection system of the present application, the control module and the pyrotechnic circuit breaker 20 are combined in a parallel structure. The parallel mode and the position of the control unit 40 can be adaptively matched according to the application. Compared with the existing series shunt solution based on the shunt device, the structure stability of the patent of the present invention is stronger, the detection current effect is better, and the integration is higher.

[0119] A short-circuit protection system of the present invention can also integrate detection and control devices such as a control unit and a current detection unit with a pyrotechnic circuit breaker to form an integrated product, thereby facilitating installation and use by vehicle manufacturers.

[0120] The circuit breaker protection system of the present application can be applied at least to the protection system of electric vehicles. In the event of a collision, overload, insulation failure or other faults in the electric vehicle, the circuit breaker protection system can be used to control the pyrotechnic circuit breaker 20 to respond in a very short time under external signal control or autonomous control of the electric vehicle, ignite the gunpowder in the pyrotechnic circuit breaker 20, and cause the internal piston of the pyrotechnic circuit breaker 20 to quickly break the bus (conductor 10) and cut off the bus passage. At this time, the bus changes from a passage to a circuit breaker, thereby protecting the battery pack, the electric vehicle and the driver and passengers.

[0121] The circuit breaker protection system of the present application is based on sensor detection technology and electronic control system, and can be optionally coordinated with BMS. It can detect abnormal conditions within milliseconds and quickly cut off the current, and can realize dual protection functions, that is, relying on the circuit breaker protection system itself to detect abnormal signals and control the detonation protection function, and the BMS can also give a control signal to realize the detonation protection function.

[0122] The circuit breaker protection system of the present application can be applied to automotive battery protection modules, as well as to industrial battery protection, consumer battery protection, military battery and current detection protection, and through cooperation with BMS and other modules, it can save the drive protection part of the BMS and the current detection part of other modules.

[0123] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0124] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A circuit breaker protection system, comprising a conductor and a pyrotechnic circuit breaker arranged on the conductor, wherein the pyrotechnic circuit breaker can cause a circuit to be broken on the conductor when driven, characterized in that: The circuit breaker protection system further comprises: a shell portion, the shell portion being mounted on the pyrotechnic circuit breaker, the shell portion comprising at least an extension portion, the extension portion extending along a side wall of the pyrotechnic circuit breaker toward the conductor and being cooperatively connected with the pyrotechnic circuit breaker; a control unit, the control unit being disposed on the shell and connected to the pyrotechnic circuit breaker and configured to drive the pyrotechnic circuit breaker; a current detection unit, the current detection unit being arranged along the extension portion, the current detection unit being connected to the control unit, and a detection end thereof being connected to the conductor; The control unit detects the current signal on the conductor through the current detection unit, and drives the pyrotechnic circuit breaker to disconnect the conductor after determining that the conductor is overloaded based on the current signal.

2. The circuit breaker protection system according to claim 1, characterized in that: The shell is a hollow cavity structure, the control unit is arranged in the hollow cavity of the shell, and is connected to the pyrotechnic circuit breaker through a first connector; The shell portion includes a shell and a cover plate buckled on the shell, a support portion for supporting the control unit is provided in the shell, and an extension portion is connected to a side wall of the shell; The cover plate is provided with a plurality of limiting portions extending into the housing, and the plurality of limiting portions are used to cooperate with the supporting portion to limit the control unit.

3. The circuit breaker protection system according to claim 2, characterized in that: The cover plate includes a plurality of limit buckles extending toward the housing, and each of the limit buckles is provided with a limit slot; The inner wall of the shell is provided with a plurality of limiting protrusions corresponding to the plurality of limiting buckles, and the plurality of limiting protrusions are used to enter the corresponding limiting buckle grooves when the cover plate is buckled on the shell.

4. The circuit breaker protection system according to claim 1, characterized in that: The shell portion includes a plurality of avoidance portions, and the plurality of avoidance portions are used to avoid protruding portions on the pyrotechnic circuit breaker when the shell portion is installed on the pyrotechnic circuit breaker.

5. The circuit breaker protection system according to claim 1, characterized in that: Slide blocks are provided on both sides of the extension part, and the slide blocks slide and are interference-connected with guide rails provided on the side walls of the pyrotechnic circuit breaker so as to install the shell part on the pyrotechnic circuit breaker.

6. The circuit breaker protection system according to claim 2, characterized in that: The extension part is a hollow structure with a groove, the hollow cavity of the extension part is communicated with the hollow cavity of the shell, and the current detection unit is arranged along the internal cavity or the groove of the extension part.

7. The circuit breaker protection system according to claim 6, characterized in that: The extension portion is one, the current detection unit comprises a second connector and a current detection element, one end of the second connector is connected to the control unit, and the other end extends along the groove of the extension portion close to the conductor, the current detection element is arranged at the other end of the second connector and connected to the conductor to detect the current signal of the conductor; When the control unit detects that the current signal is overloaded, the pyrotechnic circuit breaker is driven to disconnect the conductor.

8. The circuit breaker protection system according to claim 6, characterized in that: There are two extension parts, which are located on both sides of the housing and the pyrotechnic circuit breaker. The current detection unit includes two springs, one end of each of the springs is connected to the control unit, and the other ends of the two springs extend along the hollow cavity of the extension part and are connected to the upstream end and the downstream end of the conductor located on both sides of the pyrotechnic circuit breaker; Wherein, when the control unit detects through the two spring pieces that the voltage drop between the upstream end and the downstream end of the conductor reaches a threshold value, the control unit drives the pyrotechnic circuit breaker to disconnect the conductor.

9. The circuit breaker protection system according to claim 8, characterized in that: The spring sheet includes a straight section and a bent section, the straight section is located in the hollow cavity of the extension portion, and the bent section extends from the straight section into the hollow cavity of the shell; Among them, a plane segment is formed at the end of the straight segment close to the conductor and the end of the bent segment close to the control unit. The plane segment at the end of the straight segment is in close contact with the conductor, and the plane segment of the bent segment is in close contact with the conductive area reserved on the control unit.

10. The circuit breaker protection system according to any one of claims 1 to 9, characterized in that: Also includes: A communication unit is integrated on the control unit, and is used to send an acquired external control signal to the control unit, and the control unit drives the pyrotechnic circuit breaker according to the external control signal.

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