Trigger, excitation protection circuit and circuit protection device

Abstract

The invention relates to a trigger, an excitation protection circuit and a circuit protection device. The trigger includes a first conductive member, a second conductive member, a pressing member and a holding mechanism. The first conductive part and the second conductive part are in contact conduction; the abutting piece is used for applying abutting force pointing to the second conductive piece to the first conductive piece. The holding mechanism can limit the abutting piece so as to keep the abutting piece abutting against the first conductive piece. The second conductive part is used for being connected into a load circuit, and the trigger is configured in the mode that when current on the first conductive part and the second conductive part is larger than or equal to preset current, the maintaining mechanism can move relative to the second conductive part so as to release limiting on the abutting part, and the first conductive part can be bounced off relative to the second conductive part. According to the trigger, the first conductive part and the second conductive part can be prevented from being bonded, and the reliability of the trigger can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to a trigger, an excitation protection circuit, and a circuit protection device. Background Art

[0002] To improve electrical safety, products such as battery devices for new energy vehicles and energy storage batteries often incorporate an excitation protection circuit to disconnect the load circuit in the event of a short circuit, preventing accidents. Traditional excitation protection circuits typically consist of a relay and a trigger. The relay is connected to the load circuit, and the trigger outputs an excitation signal to the relay to disconnect the load circuit in the event of a short circuit. However, the reliability of the trigger in traditional excitation protection circuits is poor, making it difficult to meet safety requirements. Summary of the Invention

[0003] Based on this, it is necessary to provide a trigger, an excitation protection circuit and a circuit protection device to address the problem of poor reliability of the trigger in the traditional excitation protection circuit.

[0004] A trigger comprising:

[0005] A first conductive member and a second conductive member, wherein the first conductive member and the second conductive member are in contact and conductive;

[0006] a pressing member, configured to apply a pressing force directed toward the second conductive member to the first conductive member;

[0007] a holding mechanism capable of limiting the pressing member to maintain the pressing member in contact with the first conductive member;

[0008] The second conductive member is used to be connected to a load circuit, and the trigger is configured such that: when the current on the first conductive member and the second conductive member is greater than or equal to a preset current, the retaining mechanism can move relative to the second conductive member and squeeze the second elastic retaining member to release the limit on the pressing member, so that the first conductive member can bounce away from the second conductive member.

[0009] An excitation protection circuit includes the trigger as described in any of the above embodiments.

[0010] A circuit protection device includes the excitation protection circuit as described in any one of the above embodiments.

[0011] In the trigger described above, when the current in the load circuit increases, the retaining mechanism can move relative to the second conductive member. When the current in the first and second conductive members is greater than or equal to a preset current, the retaining mechanism moves relative to the second conductive member until the retaining force on the pressing member is released, causing the first conductive member to instantly lose the retaining force of the pressing member on the first conductive member, thereby allowing the first conductive member to instantly spring away from the second conductive member. This prevents the first conductive member from heating up and adhering to the second conductive member as it slowly moves away from the second conductive member, thereby preventing the trigger from failing. This helps improve the reliability of the trigger and meet safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. 4 is a circuit diagram of activating a protection circuit when a first conductive member contacts a second conductive member in some embodiments.

[0013] Figure 2 This is a circuit diagram of activating the protection circuit when the current of the second circuit is greater than or equal to a preset current in some embodiments.

[0014] Figure 3 Schematic diagram of the structure of the trigger when the first conductive element contacts the second conductive element in some embodiments.

[0015] Figure 4 for Figure 3 Exploded diagram of the trigger shown.

[0016] Figure 5 for Figure 3 A schematic structural diagram of the trigger from another angle is shown.

[0017] Figure 6 for Figure 5 The cross-sectional view of the trigger along the AA direction is shown.

[0018] Figure 7 for Figure 5 The cross-sectional view of the trigger along the BB direction is shown.

[0019] Figure 8 Schematic diagram of the structure of the trigger when the first conductive element and the second conductive element are spaced apart in some embodiments.

[0020] Figure 9 for Figure 8 The cross-sectional view of the trigger along the CC direction is shown.

[0021] Figure 10 for Figure 8 The cross-sectional view of the trigger along the DD direction is shown.

[0022] Figure 11Schematic diagram of the structure of the first conductive component and the first magnetic conductive component in some embodiments.

[0023] Figure 12 for Figure 8 The schematic diagram of the structure of some components in the trigger is shown.

[0024] Figure 13 Schematic diagram of the structure of the second conductive member and the first signal pin in some embodiments.

[0025] Figure 14 FIG. 1 is a schematic diagram of a structure in which the circuit protection component is a pyrotechnic fuse in some embodiments.

[0026] Figure 15 FIG. 4 is a circuit diagram of an excitation protection circuit using a snap-on first conductive element in some embodiments.

[0027] Figure 16 for Figure 15 The circuit diagram of the excitation protection circuit shown is when the first conductive member and the second conductive member are spaced apart.

[0028] Figure 17 FIG. 4 is a circuit diagram of a battery protection circuit in some embodiments.

[0029] Figure 18 for Figure 17 The circuit diagram of the battery protection circuit shown is when the first conductive member and the second conductive member are spaced apart.

[0030] Figure 19 Schematic diagram of the structure of the trigger in some other embodiments.

[0031] Figure 20 for Figure 19 Exploded diagram of the trigger shown.

[0032] Figure 21 for Figure 19 A schematic structural diagram of the trigger at another angle.

[0033] Figure 22 for Figure 21 The cross-sectional view of the trigger along the EE direction is shown.

[0034] Figure 23 for Figure 21 The cross-sectional diagram of the trigger along the FF direction is shown.

[0035] Figure 24 for Figure 19 The trigger is shown as a schematic structural diagram after the action member rotates relative to the second conductive member.

[0036] Figure 25 for Figure 19The schematic diagram of the structure of the trigger shown is when the action member rotates to the extreme position.

[0037] Figure 26 for Figure 25 The cross-sectional diagram of the trigger along the GG direction is shown.

[0038] Figure 27 for Figure 25 The cross-sectional view of the trigger along the HH direction is shown.

[0039] Figure 28 for Figure 19 The schematic diagram of the structure of the first conductive member and the pressing member in the trigger is shown.

[0040] Figure 29 for Figure 28 The structure diagram of the first conductive member and the pressing member at another angle is shown.

[0041] Figure 30 Schematic diagram of the structure of the active member and the fourth magnetic conductive member in some embodiments.

[0042] Figure 31 for Figure 30 The structure diagram of the active member and the fourth magnetic conductive member shown in another angle.

[0043] Figure 32 for Figure 30 The structure diagram of the active member and the fourth magnetic conductive member at another angle is shown.

[0044] Figure 33 Schematic diagram of the structure of the second conductive component and the third magnetic conductive component in some embodiments.

[0045] Figure 34 for Figure 33 The schematic diagram of the structure of the second conductive component and the third magnetic conductive component at another angle is shown. DETAILED DESCRIPTION

[0046] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0049] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0052] Traditional excitation protection circuits typically use thermal fuses or magnetic induction switches such as Hall effect elements and reed switches as triggers. With a thermal fuse, the fuse melts when the load circuit shorts, triggering a relay to disconnect the load circuit. With a magnetic induction switch, a magnetic sensing element is connected to the trigger circuit. The magnetic induction switch senses the load circuit's current and, when the current is greater than or equal to the short-circuit current, conducts the trigger circuit, triggering the relay to disconnect the load circuit.

[0053] However, thermal fuses generate little heat when the short-circuit current is short, making them difficult to blow quickly. This is especially true at low short-circuit currents. To achieve rapid blowout, the fuse cutoff must be reduced, leading to the risk of fuse blowout even at rated current. Magnetic switches are susceptible to magnetic field interference and typically require an amplifier circuit to amplify the switch signal, resulting in slow response times. Consequently, the triggers in traditional excitation protection circuits suffer from poor reliability and struggle to meet safety performance requirements.

[0054] To solve the above problems, the present application provides a trigger, an excitation protection circuit, a circuit protection device, a battery protection circuit and a power supply device.

[0055] refer to Figure 1 and Figure 2 As shown, Figure 1 FIG. 1 shows a circuit diagram of the excitation protection circuit 10 in some embodiments of the present application. Figure 2 A circuit diagram illustrating activation of a protection circuit 10 when a load circuit is short-circuited is shown. In some embodiments, the activation protection circuit 10 includes a circuit protection component 11, a first circuit 12, a trigger 20, and a second circuit 13. The circuit protection component 11 includes an on / off mechanism 111 and an off trigger mechanism 112. The on / off mechanism 111 is connected in series with the load circuit via the first circuit 12 and is capable of turning on the load circuit.

[0056] The on / off mechanism 111 may include a movable contact structure and two stationary contact structures. The two stationary contact structures are each configured to connect to a load circuit. When the movable contact structure and the two stationary contact structures are in contact and conductive, the movable contact structure and the two stationary contact structures form a loop, which can connect the first circuit 12 and thus the load circuit. The disconnection trigger mechanism 112 is configured to drive the movable contact structure away from the two stationary contact structures until the movable contact structure and the two stationary contact structures are electrically isolated, thereby disconnecting the load circuit at the on / off mechanism 111.

[0057] Trigger 20 is connected in series to first circuit 12 via a first conductive path. Trigger 20 is configured such that the resistance of the first conductive path increases when the current in first circuit 12 (the circuit to which the first conductive path is connected) increases. Second circuit 13 connects trigger 20 and disconnect trigger mechanism 112 in parallel. When first circuit 12 is connected to a load circuit and the load circuit is not short-circuited, the resistance of the first conductive path is less than the resistance of disconnect trigger mechanism 112. In other words, the current in first circuit 12 is greater than the current in second circuit 13. When the resistance of the first conductive path is significantly less than the resistance of disconnect trigger mechanism 112, the current in second circuit 13 can be approximately zero, and the current in first circuit 12 can be approximately equal to the current in the load circuit. Of course, depending on the different resistance settings of the first conductive path and disconnect trigger mechanism 112, the current in second circuit 13 may also be non-zero. In this case, the current in first circuit 12 is greater than the current in second circuit 13 and less than the current in the load circuit.

[0058] In the present application, when the load circuit is not short-circuited (for example, at rated voltage), the resistance of the first conductive path is the first resistance, and the current of the second circuit 13 is the first current. The first current can be approximately equal to 0. When the load circuit is short-circuited, the resistance of the first conductive path is the second resistance, and the current of the second circuit is the preset current. The second resistance and the preset current can correspond to the minimum short-circuit current. The preset current is greater than the first current, and the second resistance is greater than the first resistance. The specific values of the preset current, first current, second resistance, and first resistance can be set accordingly based on the rated current and short-circuit current of the load circuit and are not specifically limited in this application.

[0059] The disconnect trigger mechanism 112 is configured to drive the movable contact structure to move away from the static contact structure to disconnect the on-off mechanism 111 when the current of the second circuit 13 is greater than or equal to a preset current, so that the load circuit is disconnected at the on-off mechanism 111.

[0060] It is understood that when the on / off mechanism 111 turns on the load circuit, the current in the first circuit 12 varies with the load circuit current, the resistance of the first conductive path varies with the current in the first circuit 12, and the current in the second circuit 13 varies with the resistance of the first conductive path. When the current in the load circuit increases to the short-circuit current, the resistance of the first conductive path increases to the second resistance, causing the current in the second circuit 13 to increase to a predetermined current, causing the disconnect trigger mechanism 112 to disconnect the on / off mechanism 111, thereby providing short-circuit protection for the load circuit.

[0061] The above-mentioned excitation protection circuit 10 triggers the disconnection trigger mechanism 112 to disconnect the on-off mechanism 111 through the resistance change of the first conductive path. The resistance change of the first conductive path can be set according to different short-circuit currents to improve the accuracy of short-circuit disconnection. At the same time, the current of the second circuit 13 can change in real time with the resistance of the first conductive path, so that the trigger response of the disconnection trigger mechanism 112 is fast and not easily affected by magnetic field interference, which can improve the reliability of the excitation protection circuit 10.

[0062] The specific structural setting of the trigger 20 is not limited, as long as the resistance of the first conductive path can increase with the increase of current. The structural setting of the trigger 20 in some embodiments is given below as an example.

[0063] refer to Figure 3 、 Figure 4 and Figure 5 As shown, based on the above-mentioned excitation protection circuit 10, the present application further provides a trigger 20. The trigger 20 is used to be connected in series with the load circuit through a first conductive path. The trigger 20 also includes a second conductive path. The second conductive path is used to connect the trigger 20 in parallel with the disconnection trigger mechanism of the circuit protection component 11 to form a second circuit 13. The trigger 20 is configured such that: the resistance of the first conductive path can increase as the current in the trigger 20 increases, so that the current in the second circuit 13 increases as the current in the trigger 20 increases. When the trigger 20 is used in the excitation protection circuit 10, the current in the second circuit 13 can change in real time with the resistance of the first conductive path, so that the triggering response of the disconnection trigger mechanism 112 is rapid and not easily affected by magnetic field interference, thereby improving the reliability of the trigger 20 and the excitation protection circuit 10.

[0064] In some embodiments, the trigger 20 includes a first conductive member 24 and a second conductive member 22. The first conductive member 24 and the second conductive member 22 together constitute a first conductive path of the trigger 20. The first conductive member 24 and the second conductive member 22 are connected in series to a load circuit. The trigger 20 is configured such that the first conductive member 24 and the second conductive member 22 can move away from each other when the current in the first circuit 12 increases, thereby increasing the distance between the first conductive member 24 and the second conductive member 22. In other words, in this embodiment, the trigger 20 changes the resistance of the first conductive path through the mechanical movement of the first conductive member 24 and the second conductive member 22. By changing the distance between the first conductive member 24 and the second conductive member 22, the contact resistance between the first conductive member 24 and the second conductive member 22 is changed, thereby changing the resistance of the first conductive path, thereby increasing the sensitivity of the resistance change of the first conductive path. It will be understood that the resistance of the first conductive path is the resistance of the first conductive member 24 and the second conductive member 22, including the contact resistance between the first conductive member 24 and the second conductive member 22.

[0065] Of course, the structure of the trigger 20 is not limited to the above description. Based on the trigger 20 and the excitation protection circuit 10 described in any of the above embodiments, the present application further provides a trigger 20 having a first conductive path. In the above embodiments, the first conductive path may be composed of a first conductive member 24 and a second conductive member 22. The first conductive path is used to connect to the load circuit. The trigger 20 is configured such that when a fault current occurs in the load circuit, the resistance of the first conductive path reaches a resistance threshold, causing the circuit protection component 11 to be triggered in response to the resistance threshold reached by the first conductive path. In this application, a short circuit in the load circuit is used as an example of a fault current. The resistance threshold of the first conductive path can be the second resistance described above.

[0066] In some embodiments, the trigger 20 further includes a second conductive path, and the current of the second conductive path can reach a preset current when the resistance of the first conductive path reaches a threshold value, so that the disconnection trigger mechanism 112 of the circuit protection component 11 is triggered.

[0067] In some embodiments, the trigger 20 further includes a magnetic conductive component. The magnetic conductive component is configured to exert a magnetic field force on at least one of the first conductive member 24 and the second conductive member 22, causing the first conductive member 24 and the second conductive member 22 to move away from each other when power is supplied to the first circuit 12. The magnetic field force exerted by the magnetic conductive component on at least one of the first conductive member 24 and the second conductive member 22 can increase as the current flowing through the first conductive member 24 and the second conductive member 22 increases. In other words, in this embodiment, the trigger 20 achieves mechanical movement between the first conductive member 24 and the second conductive member 22 through the magnetic field force provided by the magnetic conductive component. The magnetic field force of the magnetic conductive component can change in real time with changes in current, thereby increasing the sensitivity of the resistance of the first conductive path to changes in current and improving the response speed of the trigger 20.

[0068] refer to Figure 3 、 Figure 4 and Figure 5 As shown, in some embodiments, taking the trigger 20 using a bridge-type first conductive member 24 as an example, the trigger 20 includes a shell 21, a first conductive member 24 and two second conductive members 22. The two second conductive members 22 are fixedly arranged on the shell 21 and both partially extend out of the shell 21 to be electrically connected to the first circuit 12, thereby connecting the trigger 20 in series to the first circuit 12.

[0069] Combine Figure 6 and Figure 7 As shown, the first conductive member 24 contacts and conducts with the two second conductive members 22 to form a loop, so that the first circuit 12 is turned on at the trigger 20. The trigger 20 is configured such that when the current of the first circuit 12 increases, the first conductive member 24 and the second conductive member 22 can move away from each other so that the resistance of the first conductive path increases.

[0070] For example, in Figure 5 In the embodiment shown, the first conductive member 24 is movably disposed in the housing 21. The first conductive member 24 can move in a direction away from the second conductive member 22 to increase the contact resistance between the first conductive member 24 and the second conductive member 22, thereby increasing the resistance of the first conductive path. Figure 8 、 Figure 9 and Figure 10 As shown, when the load circuit is short-circuited, the first conductive member 24 is spaced from the second conductive member 22 , the resistance of the first conductive path increases to the second resistance, the current of the second circuit 13 increases to the preset current, and the disconnect trigger mechanism 112 disconnects the on-off mechanism 111 .

[0071] It should be noted that, since the current carried by the disconnect trigger mechanism 112 is generally small, if the current in the second circuit 13 is too large, it is easy to cause the disconnect trigger mechanism 112 to burn out and fail, or cause the wire connecting the disconnect trigger mechanism 112 to the second circuit 13 to burn out. To avoid this situation, in some embodiments, the maximum spring distance of the first conductive member 24 relative to the second conductive member 22 can be set so that when the resistance of the first conductive path reaches the second resistance, the first conductive member 24 and the two second conductive members 22 can still be connected by arcing, so that the current is shared by the first circuit 12 before the disconnect trigger mechanism 112 disconnects the first circuit 12, thereby reducing the preset current of the second circuit 13, reducing the risk of damage to the disconnect trigger mechanism 112, and improving the reliability of the excitation protection circuit 10.

[0072] For example, reference Figure 8 and Figure 10 As shown, in some embodiments, a limiting structure 25 is provided on the inner wall of the housing 21 on the side of the first conductive member 24 facing away from the second conductive member 22, projecting toward the first conductive member 24. When the first conductive member 24 is in contact and conduction with the two second conductive members 22, the limiting structure 25 is spaced apart from the first conductive member 24. The limiting structure 25 is configured to abut the first conductive member 24 as it moves away from the second conductive members 22. When the first conductive member 24 moves away from the second conductive member 22 until it abuts the limiting structure 25, the first conductive member 24 cannot move any further away from the second conductive member 22. At this point, the resistance of the first conductive path can be exactly the second resistance, and conduction between the first conductive member 24 and the two second conductive members 22 is achieved via an arc.

[0073] By limiting the maximum distance that the first conductive member 24 can be released relative to the second conductive member 22 by the limiting structure 25, it is possible to ensure that when the resistance of the first conductive path is the second resistance, the first conductive member 24 remains conductive with the second conductive member 22, thereby sharing the current of the second circuit 13 and reducing the risk of damage to the disconnect trigger mechanism 112. The height and position of the limiting structure 25 and the maximum distance that the first conductive member 24 can be set according to the short-circuit current of the load circuit and the current carrying capacity of the disconnect trigger mechanism 112, and are not specifically limited in this application.

[0074] In some embodiments, the trigger 20 further includes a first elastic retaining member 26 disposed on the side of the first conductive member 24 facing away from the second conductive member 22. The first elastic retaining member 26 is elastically deformed by being squeezed by the first conductive member 24, thereby applying an elastic force directed toward the second conductive member 22 to the first conductive member 24, thereby elastically pressing the first conductive member 24 against the second conductive member 22 and maintaining contact and electrical connection between the first conductive member 24 and the second conductive member 22. When the springing force between the first conductive member 24 and the second conductive member 22 is greater than the elastic force applied by the first elastic retaining member 26 to the first conductive member 24, the first conductive member 24 moves away from the second conductive member 22.

[0075] In some embodiments, the trigger 20 also includes a first magnetic conductive part 27 and a second magnetic conductive part 28. The first magnetic conductive part 27 and the second magnetic conductive part 28 together constitute the magnetic conductive component of the trigger 20. The first magnetic conductive part 27 is arranged on the first conductive part 24, and the second magnetic conductive part 28 is arranged on the side of the first conductive part 24 facing away from the second conductive part 22, and is relatively fixed to the second conductive part 22. It can be understood that when the first conductive member 24 and the two second conductive members 22 connect the first circuit 12, the first magnetic conductive member 27 and the second magnetic conductive member 28 will be magnetized to generate a mutually attractive magnetic field force, thereby being able to apply a force on the first conductive member 24 pointing away from the second conductive member 22. The magnetic field force applied by the second magnetic conductive member 28 to the first conductive member 24 serves as part of the rebound force of the first conductive member 24 relative to the second conductive member 22. When the rebound force between the first conductive member 24 and the second conductive member 22 is greater than the elastic force applied by the first elastic retaining member 26 to the first conductive member 24, the first conductive member 24 moves in a direction away from the second conductive member 22, so that the resistance of the first conductive path increases.

[0076] It can be understood that when the first conductive member 24 and the second conductive member 22 are turned on, the first conductive member 24 and the second conductive member 22 themselves will also generate a relative repulsive force. When the trigger 20 is provided with a first magnetic conductive member 27 and a second magnetic conductive member 28, the magnetic field force applied by the second magnetic conductive member 28 to the first conductive member 24 and the relative repulsive force generated between the first conductive member 24 and the second conductive member 22 together constitute the rebound force of the first conductive member 24 relative to the second conductive member 22.

[0077] If the short-circuit current of the load circuit is small, when the load circuit is short-circuited, the relative repulsive force generated between the first conductive member 24 and the second conductive member 22 is less than or equal to the elastic force exerted on the first conductive member 24 by the first elastic retaining member 26, and the first conductive member 24 is insufficient to be repelled from the second conductive member 22. In this case, the magnetic field force generated by the first magnetic conductive member 27 and the second magnetic conductive member 28 can increase the repelling force of the first conductive member 24 from the second conductive member 22, so that the first conductive member 24 can be smoothly repelled from the second conductive member 22 when the load circuit is short-circuited, thereby increasing the resistance of the first conductive path. When the short-circuit current of the load circuit is large, and the relative repulsive force generated between the first conductive member 24 and the second conductive member 22 during a short circuit is sufficient to exceed the elastic force exerted on the first conductive member 24 by the first elastic retaining member 26, the first magnetic conductive member 27 and the second magnetic conductive member 28 can be omitted. When a short circuit occurs, the first conductive member 24 is repelled from the second conductive member 22 by the repulsive force generated between the first and second conductive members 24 until the trigger 20 has the second resistance. Whether to set the first magnetic conductive member 27 and the second magnetic conductive member 28 can be determined according to the short-circuit current of the load circuit and the required size of the second resistor, which is not limited in this application.

[0078] Combine Figure 9 and Figure 11 As shown, in some embodiments, the first magnetic conductive member 27 includes a main body 271 and two reinforcement portions 272. The main body 271 is fixedly disposed on the side of the first conductive member 24 facing away from the second magnetic conductive member 28. The two reinforcement portions 272 are connected to both ends of the main body 271 in a one-to-one correspondence and are located on opposite sides of the first conductive member 24. The end surfaces of the two reinforcement portions 272 facing away from the second conductive member 22 are opposite to the second magnetic conductive member 28. This arrangement can increase the magnetic field force between the first magnetic conductive member 27 and the second magnetic conductive member 28, which helps to facilitate the first conductive member 24 to be smoothly repelled relative to the second conductive member 22 when the load circuit is short-circuited.

[0079] In some embodiments, when the first conductive member 24 bounces relative to the second conductive member 22 and abuts against the limiting structure 25, the end faces of the two reinforcing portions 272 also abut against the surface of the second magnetic conductive member 28 facing the first conductive member 24, and can cooperate with the limiting structure 25 to limit the first conductive member 24, thereby improving the stability and reliability of the trigger 20 structure.

[0080] In some embodiments, the retaining structure 25 defines a receiving slot that opens toward the first conductive member 24, and the second magnetic conductive member 28 is mounted within the slot. Using the space within the retaining structure 25 to mount the second magnetic conductive member 28 facilitates a more compact structure of the trigger 20 and reduces the space occupied by the trigger 20. Furthermore, the second magnetic conductive member 28, facing the first conductive member 24 and the first magnetic conductive member 27 from within the opening of the retaining structure 25, also facilitates enhancing the magnetic field interaction between the first magnetic conductive member 27 and the second magnetic conductive member 28.

[0081] refer to Figure 8 As shown, in some embodiments, the trigger 20 is further provided with an arc extinguishing structure 29. When the first conductive member 24 is repelled relative to the second conductive member 22, an arc is generated between the first conductive member 24 and the two second conductive members 22 to share the current of the second circuit 13 and prevent damage to the disconnect trigger mechanism 112 due to excessive current. The arc extinguishing structure 29 is provided within the housing 21 to extinguish the arc generated between the first conductive member 24 and the second conductive member 22, preventing the arc from igniting and improving the safety performance of the trigger 20. The arc extinguishing structure 29 includes, but is not limited to, a magnetic steel or an arc extinguishing grid.

[0082] Furthermore, in some embodiments, the trigger 20 is provided with two arc-extinguishing structures 29, which correspond one to one with the positions of the two ends of the first conductive member 24. The arc-extinguishing structures 29 are provided with a limiting groove 291 facing the first conductive member 24, and the end of the first conductive member 24 is located in the limiting groove 291. When the first conductive member 24 moves to the extreme position away from the second conductive member 22, the first conductive member 24 abuts against the side wall of the limiting groove 291. In this way, the arc-extinguishing structure 29 can be closely integrated with the structure of the first conductive member 24 to improve the arc-extinguishing effect. At the same time, the limiting groove 291 can also be provided as needed to limit the movement of the first conductive member 24 relative to the second conductive member 22, thereby improving the reliability and stability of the structure.

[0083] In some embodiments, the arc extinguishing structure 29 is provided with an arc guide portion 292 extending toward the second conductive member 22, with the arc guide portion 292 partially located between the first conductive member 24 and the second conductive member 22. Providing the arc guide portion 292 on the arc extinguishing structure 29, closer to the conductive position where the first and second conductive members 24, 22 meet, can guide the arc generated between the first and second conductive members 24, 22 to the arc extinguishing structure 29, thereby improving the arc extinguishing effect. It is understood that the provision of the limiting groove 291 not only provides a limiting effect on the first conductive member 24, but also helps to reduce the difficulty of forming the arc guide portion 292, thereby reducing the difficulty and cost of manufacturing the trigger 20.

[0084] See Figure 12In some embodiments, the trigger 20 further includes two brackets 31. The brackets 31 may be U-shaped structures. The two brackets 31 are spaced apart along the extension direction of the first conductive member 24. The two ends of the first conductive member 24 are correspondingly located in the space enclosed by the two brackets 31. The ends of the two brackets 31 are fixedly connected to the two second conductive members 22 in a one-to-one manner. The first elastic retaining member 26 is located in the space enclosed by the brackets 31, and one end abuts against the first conductive member 24, and the other end abuts against the inner wall of the bracket 31. In some embodiments, the limiting structure 25 and the second magnetic conductive member 28 are located in the space between the two brackets 31. In this way, the bracket 31 can integrate the two second conductive members 22, the first conductive member 24 and the first elastic retaining member 26 into a structural whole, which can improve the structural stability and reliability, and at the same time is conducive to improving the structural compactness and rationality of the layout of the trigger 20.

[0085] The number of the first elastic retaining members 26 is not limited and can be set according to the elastic force required by the first conductive member 24. Figure 12 In the embodiment shown, four first elastic retaining members 26 are provided, and the first elastic retaining members 26 are located in two brackets 31 in a one-to-one correspondence, and the corresponding two first elastic retaining members 26 are spaced apart in the width direction of the first conductive member 24. By elastically abutting the first conductive member 24 at different positions, sufficient elastic force can be provided to the first conductive member 24 to prevent the first conductive member 24 from bouncing off when the load circuit does not reach the short-circuit current, and the stability and structural reliability of the movement of the first conductive member 24 relative to the second conductive member 22 can also be improved.

[0086] refer to Figure 8 and Figure 11 As shown, in some embodiments, one of the second conductive members 22 is provided with a first static contact 221, and the other second conductive member 22 is provided with a second static contact 231. The first conductive member 24 is a bridge-type structure and is provided with a first movable contact 241 and a second movable contact 242 spaced apart from each other. The first movable contact 241 is in contact and conduction with the first static contact 221, and the second movable contact 242 is in contact and conduction with the second static contact 231. When the current in the first circuit 12 increases, the first conductive member 24 can move away from the second conductive member 22, so that the first movable contact 241 and the first static contact 221 are separated, and the second movable contact 242 and the second static contact 231 are separated.

[0087] It can be understood that when a bridge-type first conductive member 24 is adopted, when the first conductive member 24 bounces relative to the second conductive member 22, the contact resistance between the first movable contact 241 and the first static contact 221, and the contact resistance between the second movable contact 242 and the second static contact 231 can both increase, thereby being able to superimpose and increase the resistance of the first conductive path, which is conducive to making the resistance change of the first conductive path more sensitive, so that the excitation protection circuit 10 can also sensitively sense the short circuit condition of the load circuit under the condition of a load circuit with a small short-circuit current, thereby improving the applicability of the excitation protection circuit 10.

[0088] It can be understood that the first conductive member 24 and the second conductive member 22 are connected through the moving contact and the static contact, which is also beneficial to reducing the contact resistance between the first conductive member 24 and the second conductive member 22, thereby reducing the resistance of the first conductive path, preventing the resistance of the first conductive path from being too large, resulting in severe arc heating, and then burning the first conductive path.

[0089] Combine Figure 8 and Figure 13 As shown, in some embodiments, the trigger 20 further includes a first signal pin 32 and a second signal pin 33. The first signal pin 32 and the second signal pin 33 are connected in parallel with the first conductive path to form a second conductive path of the trigger 20. The first signal pin 32 and the second signal pin 33 are both connected to the second circuit 13 to be connected in parallel with the disconnection trigger mechanism 112. The first signal pin 32 is electrically connected to the first and second conductive members 22, and the second signal pin 33 is electrically connected to either the second and second conductive members 22 or the first and second conductive members 24. In other words, the first and second signal pins 32 and 33 function as a conductive connection between the trigger 20 and the second circuit 13. The second conductive member 22 having the first static contact 221 and either the first conductive member 24 or the second conductive member 22 having the second static contact 231 are connected in parallel with the disconnection trigger mechanism 112 via the first and second signal pins 32 and 33.

[0090] It is understandable that the magnitude of the current in the second circuit 13 varies with changes in the resistance of the loop between the first signal pin 32 and the second signal pin 33. When the first signal pin 32 and the second signal pin 33 are provided on the two second conductive members 22 in a one-to-one correspondence, the loop between the first signal pin 32 and the second signal pin 33 passes through the conductive portion between the two second conductive members 22 and the first conductive member 24. This allows changes in the contact resistance between the two second conductive members 22 and the first conductive member 24 to superimpose changes on the current in the second circuit 13, facilitating greater sensitivity of the excitation protection circuit 10 to short-circuit currents.

[0091] In some embodiments, two first stationary contacts 221 are provided, spaced apart from each other, and two second stationary contacts 231 are provided, spaced apart from each other. Accordingly, two first movable contacts 241 are provided, spaced apart from each other, with the two first movable contacts 241 correspondingly facing each of the two first stationary contacts 221. Two second movable contacts 242 are provided, spaced apart from each other, with the two second movable contacts 242 correspondingly facing each of the two second stationary contacts 231. The first signal pin 32 is electrically connected to the second conductive member 22 having the first stationary contacts 221 via two contacts, with the two contacts of the first signal pin 32 being located between the two first stationary contacts 221 and spaced apart from each other. The second signal pin 33 is electrically connected to the second conductive member 22 having the second stationary contacts 231 via two contacts, with the two contacts of the second signal pin 33 being located between the two second stationary contacts 231. This arrangement improves the space utilization efficiency and structural compactness of the trigger 20, while also facilitating a shortened routing path for the second circuit 13.

[0092] In some embodiments, the first signal pin 32 and the second signal pin 33 are respectively arranged on the side of the two second conductive members 22 facing away from the first conductive member 24. In this way, the first signal pin 32 and the second signal pin 33 are away from the gap between the first conductive member 24 and the second conductive member 22, which can reduce the impact of the arc generated between the first conductive member 24 and the second conductive member 22 on the signal pins, and prevent the arc from affecting the sensing accuracy of the excitation protection circuit 10 for the short-circuit current.

[0093] In some embodiments, when the first conductive member 24 utilizes a bridge-type structure, the first conductive member 24 can be fixedly disposed within the housing 21, and the two second conductive members 22 can be movably disposed on the housing 21. By allowing the two second conductive members 22 to move away from the first conductive member 24, the resistance of the first conductive path can also be increased. In this embodiment, the first elastic retaining member 26 can be disposed on the side of the two second conductive members 22 facing away from the first conductive member 24, the first magnetic conductive member 27 can be disposed on the two second conductive members 22, and the second magnetic conductive member 28 can be disposed on the side of the two second conductive members 22 facing away from the first conductive member 24. Adjustments to these structures can be made with reference to the above description and are not further elaborated here.

[0094] Please see again Figure 1In some embodiments, the circuit protection assembly 11 may be a pyrotechnic relay, and the disconnection trigger mechanism 112 includes an electrically connected signal receiver and a pyrotechnic generator. The second circuit 13 is connected in parallel with the trigger 20 and the signal receiver. The signal receiver is configured to output a trigger signal to the pyrotechnic generator when the current in the second circuit 13 is greater than or equal to a preset current. The pyrotechnic generator is configured to generate an impact force to disconnect the on / off mechanism 111 upon receiving the trigger signal. For example, the pyrotechnic generator may include an igniter, gunpowder, and a piston. When the pyrotechnic generator receives the trigger signal, the igniter ignites the gunpowder, generating high-pressure gas. This drives the piston, pushing the movable contact structure away from the stationary contact structure, thereby disconnecting the on / off mechanism 111.

[0095] See Figure 14 As shown, in other embodiments, the circuit protection component 11 may also be a pyrotechnic fuse, the on-off mechanism 111 may be a wire that conducts the second circuit 13, and the disconnection trigger mechanism 112 includes a signal receiver and a pyrotechnic generator that are electrically connected. The second circuit 13 is connected in parallel with the trigger 20 and the signal receiver. The signal receiver is configured to output a trigger signal to the pyrotechnic generator when the current of the second circuit 13 is greater than or equal to a preset current. The pyrotechnic generator is configured to generate heat to melt the portion of the second circuit 13 upon receiving the trigger signal, thereby disconnecting the second circuit. For example, the portion of the second circuit 13 that is conducted by the on-off mechanism 111 may be melted.

[0096] Of course, the on-off mechanism 111 and the disconnection trigger mechanism 112 can also have any other applicable settings, as long as the on-off mechanism 111 can conduct the first circuit 12 and the disconnection trigger mechanism 112 can disconnect the on-off mechanism 111 when the current of the second circuit 13 is greater than or equal to the preset current.

[0097] refer to Figure 15 and Figure 16 As shown, in other embodiments, the trigger 20 may also employ a first conductive member 24 with a snap-fit structure. For example, one end of the first conductive member 24 is configured to connect to the first circuit 12, and the other end is provided with a second movable contact 242. The second conductive member 22 is provided with a second static contact 231. The second movable contact 242 and the second static contact 231 are in contact and conduction, and at least a portion of the first conductive member 24 is elastically deformable to move the second movable contact 242 away from the second static contact 231. In this embodiment, a first elastic retaining member 26 elastically abuts against a side of the first conductive member 24 facing away from the second conductive member 22. When the current in the first circuit 12 increases, one end of the first conductive member 24 remains connected to the second conductive member 22, and the first conductive member 24 deforms and partially moves away from the second conductive member 22, thereby increasing the contact resistance between the first conductive member 24 and the second conductive member 22, thereby also increasing the resistance of the first conductive path.

[0098] The present application also provides a circuit protection device, comprising a housing structure and an excitation protection circuit 10 as described in any of the above embodiments. The circuit protection component 11 and the trigger 20 are assembled on the housing structure and connected in series via a wire to form a first circuit 12. The circuit protection device may also be provided with a port electrically connected to the first circuit 12 so as to facilitate the first circuit 12 to be connected in series to a load circuit. The trigger 20 is connected in parallel with the disconnection trigger mechanism 112 in the circuit protection component 11 via a first signal pin 32, a second signal pin 33, and a wire to form a second circuit 13. Of course, reference Figure 17 and Figure 18 As shown, at least part of the lines of the first circuit 12 and the second circuit 13, such as the lines between the first signal pin 32 and the second signal pin 33 and the disconnect trigger mechanism 112, can also be arranged on a circuit board such as a printed circuit board arranged in the circuit protection device.

[0099] A trigger 20 and a circuit protection component 11 are integrated in the circuit protection device. The resistance of the first conductive path can change with the current. The circuit protection component 11 can disconnect the load circuit when the load circuit is short-circuited based on the change in the resistance of the first conductive path, thereby enabling the circuit protection device to achieve short-circuit protection for the load circuit.

[0100] In the circuit protection device, the trigger 20 and the circuit protection assembly 11 may be separate structures, that is, the trigger 20 and the circuit protection assembly 11 are first installed in different housing structures, and then the trigger 20 and the circuit protection assembly 11 are assembled and fixed. In other embodiments, the trigger 20 and the circuit protection assembly 11 may also be an integrated structure. For example, when the circuit protection assembly 11 is a pyrotechnic relay or a pyrotechnic fuse, the trigger 20 is integrated into the housing structure of the circuit protection assembly 11 to reduce the volume of the circuit protection device and improve space utilization efficiency.

[0101] refer to Figure 17 and Figure 18 As shown, in some embodiments, the present application also provides a battery protection circuit 50, which includes a circuit protection device as described in any of the above embodiments. The battery protection circuit 50 can be applied to any applicable power supply device such as a battery or energy storage battery of a new energy vehicle. The battery protection circuit 50 is electrically connected to the battery pack in the power supply device and is used to provide protection for the battery pack in the power supply device. For example, it is used to disconnect the circuit when the battery pack is short-circuited. The load circuit of the circuit protection device can be the power supply circuit of the battery pack.

[0102] In some embodiments, the battery protection circuit 50 further includes a battery management module 51 , which may be a module in the power supply device for detecting performance parameters of the battery pack, controlling the charging and discharging process of the battery pack, and recording battery usage data.

[0103] The battery management module 51 is electrically connected to the trigger 20 and the disconnection trigger mechanism 112. When the current in the second circuit 13 is greater than or equal to a preset current, the battery management module 51 is configured to output a trigger signal to the disconnection trigger mechanism 112 to disconnect the on / off mechanism 111. Upon receiving the trigger signal from the battery management module 51, the disconnection trigger mechanism 112 disconnects the on / off mechanism 111, thereby disconnecting the load circuit. The battery management module 51 is electrically connected to the first signal pin 32 and the second signal pin 33, and is capable of collecting electrical signals from the first signal pin 32 and the second signal pin 33, thereby monitoring the current in the second circuit 13.

[0104] The current of the second circuit 13 is monitored by the battery management module 51, and a trigger signal for disconnecting the on-off mechanism 111 is output to the disconnect trigger mechanism 112 when the current of the second circuit 13 is greater than or equal to a preset current. In this way, when the load circuit is short-circuited, if the disconnect trigger mechanism 112 fails and does not actively disconnect the on-off mechanism 111, the disconnect trigger mechanism 112 can be driven to disconnect the on-off mechanism 111 with the help of the trigger signal output by the battery management module 51, thereby achieving double insurance of short-circuit protection and improving the reliability of the battery protection circuit 50.

[0105] It should be noted that in Figure 1 and Figure 2 In the illustrated embodiment, when the first circuit 12 conducts electricity to the load circuit, the second circuit 13 remains in a conducting state. The current flowing in the second circuit 13 depends on the current in the load circuit and the resistance difference between the trigger 20 and the disconnected first conductive path. When the resistance of the first conductive path is less than the resistance of the disconnected trigger mechanism 112, the greater the difference between the resistance of the first conductive path and the resistance of the disconnected trigger mechanism 112, the smaller the current flowing in the second circuit 13.

[0106] In this embodiment, the second circuit 13 is always in an on state. The current in the second circuit 13 can change in real time with changes in the resistance of the first conductive path. The current change in the second circuit 13 does not involve mechanical movement or intermediate processes. This can improve the response speed of the current change in the second circuit 13, thereby improving the response speed of the trigger 20 to short-circuit induction, improving the reliability of the excitation protection circuit 10, and helping to meet safety performance requirements. Combined with the above description, it can be seen that the fact that the second circuit 13 is always in an on state does not mean that current is always flowing through the second circuit 13. The current in the second circuit 13 can also be approximately equal to 0.

[0107] See Figure 1 、 Figure 19 、 Figure 20 and Figure 21 In order to prevent the first conductive member 24 and the second conductive member 22 from adhering to each other and causing the trigger 20 to fail, another embodiment of the present application further provides a trigger 20 with a different structure. The trigger 20 provided in this embodiment can be applied to the excitation protection circuit 10 described in any of the above embodiments. The settings of other parts of the excitation protection circuit 10 can be obtained by referring to the above description. In some embodiments, the trigger 20 includes a first conductive member 24, a second conductive member 22, a pressing member 36 and a holding mechanism, combined with Figure 22 and Figure 23 As shown, the first conductive member 24 is in contact with the second conductive member 22, and the pressing member 36 abuts against the side of the first conductive member 24 facing away from the second conductive member 22. The retaining mechanism includes a second elastic retaining member 37 and an operating member 38. The second elastic retaining member 37 elastically abuts against the operating member 38, so that the operating member 38 can limit the pressing member 36 and maintain the abutment of the pressing member 36 against the first conductive member 24, thereby elastically pressing the first conductive member 24 against the second conductive member 22.

[0108] refer to Figure 24 As shown, the second conductive member 22 is used to be connected in series with the first circuit 12 and is used to be connected to the load circuit through the first circuit 12. The trigger 20 is configured such that: when the current of the first conductive member 24 and the second conductive member 22 increases, that is, when the current of the first circuit 12 increases, the action member 38 can move relative to the second conductive member 22 to increase the squeezing effect of the action member 38 on the second elastic retaining member 37. Figure 25 、 Figure 26 and Figure 27 As shown, when the current of the first conductive member 24 and the second conductive member 22 is greater than or equal to the short-circuit current of the load circuit, the action member 38 moves relative to the second conductive member 22 to release the limit on the pressing member 36, so that the first conductive member 24 can bounce away from the second conductive member 22.

[0109] It can be understood that before the current of the load circuit increases to the short-circuit current, due to the limitation of the first conductive member 24 by the retaining mechanism and the pressing member 36, the first conductive member 24 cannot bounce relative to the second conductive member 22. When the load circuit is short-circuited, the retaining mechanism releases the limitation on the pressing member 36, and the first conductive member 24 can instantly bounce relative to the second conductive member 22 to the position where the resistance of the first conductive path is the second resistance, and the current of the second circuit 13 is greater than or equal to the preset current, so that the disconnect trigger mechanism 112 disconnects the on-off mechanism 111, thereby realizing the short-circuit protection effect on the load circuit.

[0110] In the trigger 20 described above, when the current in the load circuit increases, the operating member 38 can move relative to the second conductive member 22, causing the operating member 38 to gradually increase its squeezing effect on the second elastic retaining member 37. When the load circuit is short-circuited, the currents flowing between the first conductive member 24 and the second conductive member 22 are greater than or equal to the short-circuit current of the load circuit, and the operating member 38 moves relative to the second conductive member 22 until the restraining force on the pressing member 36 is released, causing the first conductive member 24 to instantly lose the holding force of the pressing member 36 on the first conductive member 24, thereby allowing the first conductive member 24 to instantly bounce away from the second conductive member 22. This prevents the first conductive member 24 from bonding to the second conductive member 22 due to heat as it slowly moves away from the second conductive member 22, thereby preventing the trigger 20 from failing. This helps improve the reliability of the trigger 20 and meet safety requirements.

[0111] In some embodiments, the trigger 20 further includes a magnetic conductive component configured to apply a magnetic field force to the actuator 38, thereby driving the actuator 38 to move relative to the second conductive component 22. Furthermore, the magnetic field force applied by the magnetic conductive component to the actuator 38 can increase with increasing current flowing through the first conductive component 24 and the second conductive component 22. In other words, in this embodiment, the trigger 20 achieves movement of the actuator 38 through the magnetic field force of the magnetic conductive component, and the magnetic field force can change in real time with changes in current, thereby improving the response speed of the trigger 20.

[0112] refer to Figure 21 、 Figure 28 and Figure 29 As shown, in some embodiments, the pressing member 36 includes a pressing portion 361, a connecting portion 362, and a matching portion 363. The pressing portion 361 abuts against the side of the first conductive member 24 facing away from the second conductive member 22. The matching portion 363 is located on the side of the pressing portion 361 facing away from the first conductive member 24. The connecting portion 362 connects the pressing portion 361 and the matching portion 363. The operating member 38 includes a limiting portion 381 abutting against the side of the matching portion 363 facing away from the first conductive member 24. The operating member 38 can rotate relative to the second conductive member 22 around an axis perpendicular to the first conductive member 24 and pointing toward the second conductive member 22, so that the limiting portion 381 moves away from the first conductive member 24 until it disengages from the matching portion 363.

[0113] It is understood that when the limiting portion 381 abuts the side of the mating portion 363 facing away from the first conductive member 24, under the elastic force of the second elastic retaining member 37, the limiting portion 381 applies a force directed toward the first conductive member 24 to the mating portion 363, thereby maintaining the pressing action of the pressing portion 361 on the first conductive member 24. As the current in the first circuit 12 gradually increases, the acting member 38 gradually rotates relative to the second conductive member 22, causing the limiting portion 381 to gradually move away from the first conductive member 24. This causes the overlap between the limiting portion 381 and the mating portion 363 on the side of the mating portion 363 facing away from the first conductive member 24 to gradually decrease. Before the limiting portion 381 completely disengages from the mating portion 363, the limiting portion 381 maintains the abutting action of the pressing member 36 against the first conductive member 24, maintaining contact between the first conductive member 24 and the second conductive member 22. When the load circuit is short-circuited, the action member 38 rotates relative to the second conductive member 22 until the limiting portion 381 completely disengages from the mating portion 363 , releasing the limiting action on the pressing member 36 , thereby causing the pressing member 36 and the first conductive member 24 to bounce away from the second conductive member 22 as a whole.

[0114] Combine Figure 30 、 Figure 31 and Figure 32 As shown, in some embodiments, the action member 38 further includes a rotating portion 382 connected to the limiting portion 381. The rotating portion 382 is located on one side of the first conductive member 24 in the extension direction and is rotatable relative to the second conductive member 22. The second elastic retaining member 37 elastically abuts against the side of the rotating portion 382 facing away from the first conductive member 24. When the first conductive member 24 and the second conductive member 22 are in contact and conductive, the end of the rotating portion 382 connected to the limiting portion 381 can be substantially perpendicular to the extension direction of the first conductive member 24, and the axial direction of the second elastic retaining member 37 can be substantially parallel to the extension direction of the first conductive member 24, so that the elastic force applied by the second elastic retaining member 37 on the rotating portion 382 can be effectively converted into a limiting effect applied by the limiting portion 381 on the mating portion 363.

[0115] Combine Figure 21 、 Figure 33 as well as Figure 34As shown, in some embodiments, the trigger 20 further includes a third magnetic conductive member 39 and a fourth magnetic conductive member 41. The third magnetic conductive member 39 and the fourth magnetic conductive member 41 together constitute the magnetic conductive assembly of the trigger 20. The third magnetic conductive member 39 is disposed on the second conductive member 22, and the fourth magnetic conductive member 41 is disposed on the actuating member 38 and is opposite to the third magnetic conductive member 39. It will be understood that when the first conductive member 24 and the second conductive member 22 conduct the load circuit via the first circuit 12, the third magnetic conductive member 39 and the fourth magnetic conductive member 41 are magnetized to generate a mutually attractive magnetic field force. As the load circuit current increases, the actuating member 38 is able to overcome the elastic force of the second elastic retaining member 37 under the magnetic field force applied by the fourth magnetic conductive member 41, thereby rotating relative to the second conductive member 22. When the load current is short-circuited, the magnetic field force between the third magnetic conductive member 39 and the fourth magnetic conductive member 41 increases to a level that can drive the action member 38 to rotate relative to the second conductive member 22 to a position that releases the limiting effect on the pressing member 36, thereby causing the first conductive member 24 to bounce away from the second conductive member 22.

[0116] In some embodiments, the actuator 38 further includes a mounting portion 383 connected to the rotating portion 382 and positioned between the rotating portion 382 and the second conductive member 22. The mounting portion 383 forms an angle with the end of the rotating portion 382 away from the limiting portion 381. The fourth magnetic conductive member 41 is disposed on the mounting portion 383. Providing the mounting portion 383 at an angle to the rotating portion 382 not only satisfies the mounting requirements of the fourth magnetic conductive member 41, but also prevents interference between the fourth magnetic conductive member 41 and the second elastic retaining member 37, thereby improving the structural reliability and compactness of the trigger 20.

[0117] In some embodiments, the rotating axis of the action member 38 relative to the second conductive member 22 can be arranged at the connection between the rotating portion 382 and the mounting portion 383, so that the magnetic field force applied by the fourth magnetic conductive member 41 to the mounting portion 383, the elastic force applied by the second elastic retaining member 37 to the rotating portion 382, and the extension direction of the limiting portion 381 all roughly correspond to the radial position of the rotating circle, thereby improving the rationality of the structural layout and the matching stability of the action member 38 and the pressing portion 361.

[0118] In some embodiments, the second magnetic conductive member 28 protrudes from the side of the mounting portion 383 facing the second conductive member 22. The rotational range of the actuator 38 is designed so that the actuator 38 rotates relative to the second conductive member 22 until the second magnetic conductive member 28 abuts the second conductive member 22. That is, when the actuator 38 rotates to its extreme position, the limiting portion 381 disengages the mating portion 363, and the actuator 38 releases its limiting effect on the first conductive member 24. This helps improve product consistency of the trigger 20, facilitates production of the trigger 20, and enhances production precision.

[0119] Please see again Figure 21 and Figure 23 As shown, the trigger 20 provided in this embodiment may also be provided with a limiting structure 25. The limiting structure 25 is provided on a side of the first conductive member 24 facing away from the second conductive member 22 and is fixed relative to the second conductive member 22. For example, both the limiting structure 25 and the second conductive member 22 are fixedly mounted on the housing 21 of the trigger 20. The limiting structure 25 is spaced apart from the first conductive member 24 and is configured to abut the first conductive member 24 as the first conductive member 24 moves away from the second conductive member 22. When the limiting structure 25 abuts the first conductive member 24, the first conductive member 24 and the second conductive member 22 are spaced apart and conduct electricity through an arc. After the action member 38 releases the limit on the pressing member 36 so that the first conductive member 24 bounces away relative to the second conductive member 22, the limiting structure 25 can limit the maximum bounce distance of the first conductive member 24 relative to the second conductive member 22, so that when the first conductive member 24 is at the maximum bounce distance, the first conductive member 24 can still be connected to the second conductive member 22 to conduct the first circuit 12, so as to share the current of the second circuit 13 before the disconnect trigger mechanism 112 disconnects the on-off mechanism 111, thereby reducing the risk of damage to the disconnect trigger mechanism 112 due to excessive current.

[0120] In some embodiments, the trigger 20 further includes a fifth magnetic conductive member (not shown) and a sixth magnetic conductive member (not shown). The fifth magnetic conductive member is disposed on the first conductive member 24, and the sixth magnetic conductive member is disposed on a side of the first conductive member 24 facing away from the second conductive member 22, and opposite the fifth magnetic conductive member. When the first conductive member 24 and the second conductive member 22 conduct the first circuit 12 and the load circuit, the fifth and sixth magnetic conductive members can be magnetized to generate a mutually attractive magnetic field force, thereby exerting a magnetic field force on the first conductive member 24 directed away from the second conductive member 22. The magnetic field force exerted by the fifth magnetic conductive member on the first conductive member 24 can be transmitted to the operating member 38 via the pressing member 36, and together with the magnetic field forces generated by the third magnetic conductive member 39 and the fourth magnetic conductive member 41, the operating member 38 is driven to rotate relative to the second conductive member 22 until the operating member 38 releases the restraint on the pressing member 36.

[0121] The fifth and sixth magnetic conductive members are provided to cooperate with the third and fourth magnetic conductive members 39, 41, and together drive the actuator 38 to rotate when the current in the first circuit 12 increases. This can apply a greater force to the actuator 38, thereby adapting to conditions where the current in the load circuit is low. Even when the short-circuit current in the load circuit is low, the actuator 38 can be smoothly driven to rotate, releasing the restraining force on the pressing member 36. Simultaneously, the trigger 20 can reduce the magnetic field force required by the third and fourth magnetic conductive members 39, 41, thereby facilitating reductions in the respective sizes of the third, fourth, fifth, and sixth magnetic conductive members. This allows for the installation of multiple magnetic conductive members in different spaces within the housing 21, improving the rationality and compactness of the structural layout and facilitating a reduction in the space occupied by the trigger 20.

[0122] In some embodiments, the trigger 20 further includes an elastic member 42 disposed on a side of the first conductive member 24 facing the second conductive member 22. When the first conductive member 24 is in contact with the static contact, the elastic member 42 is elastically compressed by the first conductive member 24 to exert an elastic force on the first conductive member 24 in a direction away from the second conductive member 22. The provision of the elastic member 42 can cause the first conductive member 24 to have a tendency to move away from the second conductive member 22. Thus, when the action member 38 releases the restraint on the pressing member 36, the first conductive member 24 can smoothly spring away from the second conductive member 22 until the resistance of the first conductive path reaches the second resistance.

[0123] Of course, when the first conductive member 24 and the second conductive member 22 conduct the load circuit, the first conductive member 24 and the second conductive member 22 themselves will also generate a mutual repulsive force. When the short-circuit current of the load circuit is large enough so that the mutual repulsive force generated by the first conductive member 24 and the second conductive member 22 themselves during the short circuit can also drive the first conductive member 24 to bounce away from the second conductive member 22 until the resistance of the first conductive path increases to the second resistance, the elastic member 42 can also be omitted.

[0124] It should be noted that the movement of the action member 38 relative to the second conductive member 22 is not limited to rotational movement, as long as it can limit the pressing member 36 or disengage from the pressing member 36. For example, in other embodiments, driven by the magnetic field force of the magnetic conductive assembly, the action member 38 can undergo translational movement relative to the second conductive member 22, and the movement direction of the action member 38 can be parallel to the extension direction of the first conductive member 24, so that the limiting portion 381 moves along the extension direction of the first conductive member 24 until it disengages from the pressing member 36. In this embodiment, the second conductive member 22 can be partially bent to one side of the first conductive member 24 in the extension direction, so that the third magnetic conductive member 39 provided on the second conductive member 22 can be opposite to the fourth magnetic conductive member 41 in the extension direction of the first conductive member 24, so that the action member 38 applies a magnetic field force parallel to the extension direction of the first conductive member 24.

[0125] In some embodiments, the trigger 20 may employ a first conductive member 24 having a bridge-type structure, and two second conductive members 22 may be provided, spaced apart from each other. Both second conductive members 22 are fixedly mounted on the housing 21. One of the second conductive members 22 is provided with a first static contact 221 facing the first conductive member 24, and the other second conductive member 22 is provided with a second static contact 231 facing the first conductive member 24. The first conductive member 24 is provided with a first movable contact 241 and a second movable contact 242 facing the second conductive member 22. The first movable contact 241 is in contact with the first static contact 221, and the second movable contact 242 is in contact with the second static contact 231. When the action member 38 releases the restraint on the pressing member 36, the first conductive member 24 can cause the two second conductive members 22 to spring apart, causing the first movable contact 241 and the first static contact 221 to move relatively apart, and the second movable contact 242 and the second static contact 231 to move relatively apart. When the first conductive member 24 bounces relative to the two second conductive members 22 until the resistance of the first conductive path is the second resistance, the first movable contact 241 and the first static contact 221 are connected by arc, and the second movable contact 242 and the second static contact 231 are connected by arc.

[0126] In some embodiments, the trigger 20 is provided with two sets of retaining mechanisms and two pressing members 36. The two pressing members 36 abut against the spaced positions of the first conductive member 24. The two sets of retaining mechanisms correspond one-to-one to the two end positions of the first conductive member 24 and limit the two pressing members 36 one-to-one.

[0127] Furthermore, in some embodiments, the contact positions of the two pressing members 36 against the first conductive member 24 are aligned with the positions of the first movable contact 241 and the second movable contact 242. This allows for a uniform contact force to be applied to all portions of the first conductive member 24, thereby improving the contact reliability and stability between the first movable contact 241, the second movable contact 242, and the second conductive member 22.

[0128] Please see again Figure 15 、 Figure 16 as well as Figure 21 As shown, when the trigger 20 is provided with a retaining mechanism and a pressing member 36, the trigger 20 can also employ a first conductive member 24 with a snap-fit structure. For example, in some embodiments, one end of the first conductive member 24 is connected to a load circuit, and the other end is provided with a second movable contact 242. The second conductive member 22 is provided with a second stationary contact 231 that is in contact and conductive with the second movable contact 242. At least a portion of the first conductive member 24 is elastically deformable, such that the portion of the first conductive member 24 provided with the second stationary contact 231 moves toward or away from the second conductive member 22. When the first conductive member 24 is abutted against the second conductive member 22 by the pressing member 36, the first conductive member 24 elastically deforms, such that the portion of the first conductive member 24 provided with the second movable contact 242 tends to move away from the second conductive member 22.

[0129] It is understood that when a snap-fit first conductive member 24 is employed and, when the first conductive member 24 and the second conductive member 22 are in contact and conductive, the portion of the first conductive member 24 provided with the second movable contact 242 tends to move away from the second conductive member 22. Therefore, the elastic member 42 can be omitted. When the action member 38 releases the restraint on the pressing member 36, the first conductive member 24 springs away from the second conductive member 22 by utilizing its own elastic restoring force. Of course, the elastic member 42 can also be provided simultaneously with the snap-fit first conductive member 24. The elastic force exerted by the elastic member 42 on the first conductive member 24, combined with the elastic restoring force of the first conductive member 24 itself, can facilitate smoother springing of the first conductive member 24 relative to the second conductive member 22, thereby improving the reliability of the trigger 20.

[0130] In the present application, the first elastic retaining member 26 and the second elastic retaining member 37 include but are not limited to springs, and the pressing member 36 includes but is not limited to a compression spring.

[0131] In an embodiment where the trigger 20 is provided with a retaining mechanism and a pressing member 36, the trigger 20 can be used in an excitation protection circuit 10. The trigger 20 is connected in series with the first circuit 12 via the second conductive member 22 and is also connected in series with the load circuit. The second circuit 13 is connected in parallel with the trigger 20 and the disconnect trigger mechanism 112, for example, via a first signal pin 32 and a second signal pin 33 connected in parallel with the trigger 20. The first signal pin 32 and the second signal pin 33 are electrically connected to the two second conductive members 22 in a one-to-one correspondence. When the load circuit is short-circuited, the action member 38 releases the restraint on the pressing member 36, causing the first conductive member 24 to spring away from the second conductive member 22 until the resistance of the first conductive path reaches a second resistance and the current in the second circuit 13 reaches a preset current. The disconnect trigger mechanism 112 is configured to disconnect the on / off mechanism 111 when the current in the second circuit 13 is greater than or equal to the preset current.

[0132] The trigger 20 can also be applied to the circuit protection device, battery protection circuit 50 and power supply device described in any of the above embodiments. The specific settings can be obtained by referring to the above records and will not be repeated here.

[0133] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0134] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A trigger, characterized in that: include: A first conductive member and a second conductive member, wherein the first conductive member and the second conductive member are in contact and conductive; a pressing member, configured to apply a pressing force directed toward the second conductive member to the first conductive member; a holding mechanism capable of limiting the pressing member so as to maintain the pressing member in contact with the first conductive member; The second conductive member is used to be connected to a load circuit, and the trigger is configured such that when the current on the first conductive member and the second conductive member is greater than or equal to a preset current, the retaining mechanism can move relative to the second conductive member to release the limit on the pressing member, so that the first conductive member can bounce away from the second conductive member.

2. The trigger according to claim 1, wherein: The trigger also includes a magnetic conductive component, which is used to apply a magnetic field force to the active member to drive the active member to move relative to the second conductive member, and the magnetic field force applied by the magnetic conductive component to the active member can increase with the increase of the current on the first conductive member and the second conductive member.

3. The trigger according to claim 1, wherein: The holding mechanism includes a second elastic holding member and an acting member, wherein the second elastic holding member elastically abuts against the acting member so that the acting member can limit the pressing member. During the process in which the acting member moves relative to the second conductive member in the direction of releasing the limiting position of the pressing member, the acting member further squeezes the second elastic holding member.

4. The trigger according to claim 3, characterized in that The pressing member includes a pressing portion, a connecting portion and a matching portion, the pressing portion abuts against the side of the first conductive member facing away from the second conductive member, the matching portion is located on the side of the pressing portion facing away from the first conductive member, and the connecting portion is connected to the pressing portion and the matching portion; the active member has a limiting portion abutting against the side of the matching portion facing away from the first conductive member, and the active member can move relative to the second conductive member so that the limiting portion moves relative to the matching portion until it disengages from the matching portion.

5. The trigger according to claim 4, characterized in that The acting member can rotate relative to the second conductive member around an axis perpendicular to the first conductive member and pointing in a direction toward the second conductive member, so that the limiting portion moves in a direction away from the first conductive member.

6. The trigger according to claim 5, characterized in that The action member also includes a rotating portion connected to the limiting portion, the rotating portion is located on one side of the first conductive member in the extension direction and can rotate relative to the second conductive member, and the second elastic retaining member elastically abuts against the side of the rotating portion facing away from the first conductive member.

7. The trigger according to claim 6, characterized in that The trigger further includes a third magnetic conductive part and a fourth magnetic conductive part. The fourth magnetic conductive part is arranged on the action part. The third magnetic conductive part is arranged on a side of the fourth magnetic conductive part facing the second conductive part and opposite to the third magnetic conductive part.

8. The trigger according to claim 7, wherein: The active member further includes a mounting portion, which is connected to the rotating portion and located between the rotating portion and the second conductive member. An angle is formed between the mounting portion and the rotating portion, and the fourth magnetic conductive member is provided on the mounting portion.

9. The trigger according to claim 1, wherein: The trigger further includes a fifth magnetic conductive member and a sixth magnetic conductive member. The fifth magnetic conductive member is arranged on the first conductive member. The sixth magnetic conductive member is arranged on a side of the first conductive member facing away from the second conductive member and opposite to the fifth magnetic conductive member.

10. The trigger according to claim 1, wherein: The trigger further includes an elastic member, which is elastically compressed by the first conductive member to apply an elastic force on the first conductive member in a direction away from the second conductive member.

11. The trigger according to claim 1, wherein: The first conductive member is provided with a moving contact, the second conductive member is provided with a static contact electrically connected to the moving contact, and the grounding position of the pressing member to the dynamic spring corresponds to the position of the moving contact.

12. The trigger according to claim 1, wherein: The trigger also includes a limiting structure, which is arranged on the side of the first conductive part facing away from the second conductive part and is fixed relatively to the second conductive part. The limiting structure is spaced apart from the first conductive part and is used to abut the first conductive part on the path of the first conductive part moving away from the second conductive part. When the limiting structure abuts against the first conductive part, the first conductive part and the second conductive part can be connected through an arc.

13. The trigger according to claim 1, wherein: The second conductive member is provided with two spaced apart members, each of which is provided with a first static contact and a second static contact facing the first conductive member in a one-to-one correspondence; the first conductive member is provided with a first movable contact and a second movable contact spaced apart and facing the second conductive member, the first movable contact is in contact and conduction with the first static contact, and the second movable contact is in contact and conduction with the second static contact; The trigger is provided with two sets of the retaining mechanisms and two pressing members, the two pressing members abut against the spaced positions of the first conductive member, the two sets of the retaining mechanisms correspond one to one with the two end positions of the first conductive member, and limit the two pressing members one to one.

14. The trigger according to claim 1, wherein: One end of the first conductive member is used to be connected to the load circuit, and the other end is provided with a second moving contact. The second conductive member is provided with a second static contact that is in contact and conductive with the second moving contact. The first conductive member is elastically deformed when the pressing member abuts against the second conductive member, and the portion of the first conductive member provided with the second moving contact tends to move away from the second conductive member.

15. An excitation protection circuit, characterized in that: Comprising a trigger as described in any one of claims 1-14.

16. The excitation protection circuit according to claim 15, characterized in that: The excitation protection circuit also includes a circuit protection component, a first circuit and a second circuit. The circuit protection component includes an on-off mechanism and a disconnection trigger mechanism. The first circuit is connected in series with the on-off mechanism and the trigger, and is used to be connected in series to the load circuit. The on-off mechanism is used to turn on the load circuit. The second circuit is connected in parallel with the trigger and the disconnection trigger mechanism. When a fault current occurs in the load circuit and the action member releases the limit on the pressure member, the current of the second circuit is a preset current. The disconnection trigger mechanism is configured to disconnect the on-off mechanism when the current of the second circuit is greater than or equal to the preset current.

17. The excitation protection circuit according to claim 16, characterized in that: The circuit protection component is a pyrotechnic relay, the disconnection trigger mechanism includes a signal receiver and a pyrotechnic generator electrically connected to each other, the second circuit is connected in parallel to the trigger and the signal receiver, the signal receiver is configured to output a trigger signal to the pyrotechnic generator when the current of the second circuit is greater than or equal to the preset current, and the pyrotechnic generator is configured to generate an impact force to disconnect the on-off mechanism upon receiving the trigger signal; or The circuit protection component is a pyrotechnic fuse, the disconnection trigger mechanism includes a signal receiver and a pyrotechnic generator that are electrically connected, the second circuit is connected in parallel to the trigger and the signal receiver, the signal receiver is configured to output a trigger signal to the pyrotechnic generator when the current of the second circuit is greater than or equal to the preset current, and the pyrotechnic generator is configured to generate heat to fuse the portion of the second circuit upon receiving the trigger signal.

18. A circuit protection device, characterized in that: The invention comprises an excitation protection circuit as described in any one of claims 15 to 17.

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