A secondary locking mechanism and a high-voltage connector

Abstract

This invention discloses a secondary locking mechanism and a high-voltage connector, including a plug housing and a socket housing. A primary locking plate is mounted on the plug housing, and a set of blocks is provided on the same side end face of the socket housing. The distal end of the primary locking plate engages with the set of blocks to form a primary locking mechanism. A socket is formed between the primary locking plate and the end face of the plug housing, and a secondary locking plate is movably inserted into the socket. A limiting strip is provided on the end face of the socket housing, and a first engaging arm is provided at the distal end of the secondary locking plate. The distal end of the first engaging arm has a slot. The secondary locking plate drives the slot to engage with the limiting strip through axial movement to form a secondary locking mechanism. When the plug housing and the socket housing are in a secondary locking state, the first engaging arm is simultaneously located at the bottom of the first pressing part and the second pressing part to press the primary locking plate and lock the primary locking mechanism.

Description

Technical Field

[0001] This invention relates to the field of connector technology, and more specifically to a secondary locking mechanism and a high-voltage connector. Background Technology

[0002] As a connector that requires the flow of high-voltage current, the safety of high-voltage interlock connectors is crucial to their manufacturing. During the unlocking and unlocking process, there is a possibility that the connector may be pulled out while energized, which can cause burning of the contacts and even the connector itself, potentially harming the vehicle and operators. Therefore, high-voltage connectors need to consider the time interval between the disconnection of the interlock signal circuit and the power circuit. To address this issue, some connectors on the market have emerged that can achieve step-by-step disconnection of the interlock signal circuit and the power circuit. Most of these connectors use levers to form two locking structures. As disclosed in patent CN103066451A, unlocking is achieved by pressing the primary hook and the secondary hook separately, thus detaching the connector from the mating socket connector.

[0003] For locking structures that achieve step-by-step connection between dry and wet applications, an insertable locking block is typically used to form a secondary lock. This locking block usually has a hook structure at its bottom or front end to achieve a locking action and prevent detachment. As disclosed in announcement number CN 216214505 U, its secondary locking plate has a hook at its front end to engage with the housing. This locking structure requires constant contact with the housing during use, resulting in hard friction, which easily wears down the hook structure at the front end. Simultaneously, the hook structure makes removal difficult, requiring significant pulling force, which can easily lead to breakage of the hook structure and locking failure. Therefore, how to quickly achieve a secondary locking function while improving usability and convenience is a pressing issue that needs to be addressed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a secondary locking mechanism and a high-voltage connector.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A secondary locking mechanism includes a plug housing and a socket housing that are pluggable to each other. A primary locking plate is mounted on one end face of the plug housing, and a set of blocks is provided on the same end face of the socket housing. The distal end of the primary locking plate engages with the set of blocks to form a primary locking mechanism that locks the plug housing and the socket housing into an engaged state. The primary locking plate extends straight and its middle portion is fixedly connected to the plug housing. The distal and proximal ends of the primary locking plate form a first pressing portion and a second pressing portion that can perform a seesaw motion relative to its middle portion. The primary locking mechanism unlocks in stages by alternately pressing the first pressing portion and the second pressing portion. The primary locking plate and the plug housing... A socket is formed between the end faces of the plug and the socket housing. A secondary locking piece is movably inserted into the socket. An axially extending limiting strip is provided on the end face of the socket housing. The distal end of the secondary locking piece is provided with an axially extending first locking arm. The distal end of the first locking arm has a slot that matches the limiting strip. The secondary locking piece drives the slot to engage with the limiting strip through axial movement, forming a secondary locking mechanism that locks the plug housing and the socket housing in the plugged state. When the plug housing and the socket housing are in the secondary locking state, the first locking arm is simultaneously located at the bottom of the first pressing part and the second pressing part to press against the primary locking piece and lock the primary locking mechanism.

[0007] Preferably, a set of stops includes a first stop and a second stop, the first stop and the second stop having a distance difference in the axial direction, and the first stop being closer to the proximal end of the socket housing. The front end of the primary locking piece is provided with two clamping arms opposite each other, and the inner ends of the clamping arms form a slot that can engage with the first stop. The two second stops are respectively disposed on both sides of the first stop, and the outer ends of the clamping arms can engage with the second stops.

[0008] Preferably, a set of stops includes a first stop and a second stop, the first stop and the second stop having a distance difference in the axial direction, and the second stop being closer to the proximal end of the socket housing. The front end of the primary locking piece is provided with two clamping arms opposite each other, the inner end of the clamping arms being able to engage with the first stop; the two second stops are respectively disposed on both sides of the first stop, and the outer end of the clamping arms being able to engage with the second stop.

[0009] Preferably, the proximal bottom surface of the first stop block forms a first driving slope that can drive the inner end to move downward, and the proximal top surface of the second stop block forms a second driving slope that can drive the outer end to move upward; a first gap is formed between the bottom surface of the first stop block and the end face of the socket housing, and the height of the first gap is greater than the thickness of the inner end, so that the engagement between the inner end and the first stop block can be unlocked by pressing down the first pressing part; a second gap is formed between the bottom surface of the inner end and the end face of the socket housing, and the height of the second stop block is greater than the second gap, so that the engagement between the outer end and the second stop block can be unlocked by pressing down the second pressing part.

[0010] Preferably, the proximal end of the first stop is fixedly connected to the distal end of the limiting strip.

[0011] Preferably, the first locking arm is composed of two symmetrically spaced arms, with the slot formed between the two arms. The proximal end of the limiting strip has a head with a width greater than its extension. The two arms are elastic and can move relative to each other to form an openable opening so that the head can be engaged in the slot.

[0012] Preferably, the inner wall of the support arm is recessed with a limiting recess that matches the head, and the head is engaged between the two limiting recesses. The two sides of the proximal end of the head, the two sides of the opening, and the two sides of the limiting recess are all inclined surfaces with matching slopes.

[0013] Preferably, the inner walls of the two support arms are symmetrically provided with protrusions, and a limiting groove is formed between the proximal end of the protrusion and the proximal end of the support arm. An axially extending fixing block is fixed on the end face of the plug housing. When the plug housing and the socket housing are in a secondary locking state, the fixing block is located in the limiting groove. The two sides of the far end of the fixing block and the two sides of the far end of the limiting groove are inclined surfaces with the same slope.

[0014] Preferably, the distal ends of the secondary locking plate are respectively fixed with axially extending second locking arms, the two side walls of the socket are provided with protruding first locking blocks, and the outer side surface of the second locking arm is provided with a recess that matches the first locking block, so that when the plug housing and the socket housing are in the secondary locking state, the second locking arm is locked in the socket.

[0015] A high-voltage connector includes a secondary locking mechanism as described above, at least one pair of matched power male terminals and power female terminals, and one pair of matched signal male terminals and signal female terminals. The power female terminals and signal male terminals are respectively fixed in the plug housing, and the power male terminals and signal female terminals are respectively fixed in the socket housing. The distance between a pair of power male terminals and power female terminals is less than the distance between a pair of signal male terminals and signal female terminals.

[0016] The beneficial effects of this invention are mainly reflected in:

[0017] A primary locking plate with elastic deformation at both ends is used to form a primary locking mechanism with a set of stops to lock the plug housing and socket housing together. A secondary locking plate that can move axially is then used to lock the plug housing and socket housing together again. The length of the first snap-fit ​​arm at the far end of the secondary locking plate is adapted to the primary locking plate. In the secondary locking state, the secondary locking plate is located at the bottom of both the first and second pressing parts, locking the plug housing and socket housing while pressing against the primary locking plate. By locking the primary locking plate, the locking effect of the primary locking mechanism is ensured, ensuring the stability and reliability of the plug housing and socket housing during use, and ensuring safety during use.

[0018] The first stop and the limiting strip are fixedly connected so that the limiting strip guides the insertion of the primary locking piece and ensures that the secondary locking piece is located at the bottom of the primary locking piece after being inserted into it, thereby pressing against the primary locking piece to form a locking effect.

[0019] The first and second blocks form a first gap and a second gap between the end face of the socket housing to create a height difference. On the one hand, they can be engaged with the inner and outer ends of the clamping arm respectively. On the other hand, they can be unlocked step by step by pressing the first and second pressing parts, so as to separate the power terminals and signal terminals step by step to avoid hot plugging and unplugging and ensure safe use.

[0020] The first locking arm consists of two elastic support arms that engage with the limiting strip by opening and closing from left to right, rather than by snapping it up and down. This ensures the integrity of the locking mechanism of the first locking arm during movement. At the same time, this opening and closing structure can work with the fixing block to form an easy-to-open unlocking structure, improving the insertion and removal efficiency of the secondary locking piece, thereby ensuring the service life of the secondary locking piece and forming an effective and reliable locking effect. Attached Figure Description

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 : A schematic diagram of the first embodiment of the secondary locking mechanism;

[0023] Figure 2 : A cross-sectional view of the first embodiment of the secondary locking mechanism;

[0024] Figure 3 : Schematic diagram of the plug housing;

[0025] Figure 4 : A schematic diagram of the plug housing from another angle;

[0026] Figure 5 : Schematic diagram of the secondary locking plate;

[0027] Figure 6 : A cross-sectional view of the first embodiment of the secondary locking mechanism in the first stage of the primary locking and engagement process;

[0028] Figure 7 : A cross-sectional view of the first embodiment of the secondary locking mechanism in the second stage of the primary locking and engagement process;

[0029] Figure 8 : A cross-sectional view of the first embodiment of the secondary locking mechanism during the secondary locking engagement process;

[0030] Figure 9 : A schematic diagram of the second embodiment of the secondary locking mechanism;

[0031] Figure 10 A schematic diagram of the first stage of a high-voltage connector during a single locking and mating process;

[0032] Figure 11 : Schematic diagram of the second stage of the high-voltage connector during the first locking and mating process. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0034] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0035] like Figures 1 to 11As shown, this invention discloses a secondary locking mechanism, including a plug housing 1 and a socket housing 2 that are pluggable to each other. A primary locking plate 101 is mounted on one end face of the plug housing 1, and a set of blocks is provided on the same end face of the socket housing 2. The distal end of the primary locking plate 101 engages with the set of blocks to form a primary locking mechanism that locks the plug housing 1 and the socket housing 2 into an engaged state. The primary locking plate 101 extends straight and its middle portion is fixedly connected to the plug housing 1. The distal and proximal ends of the primary locking plate 101 form a first pressing part 102 and a second pressing part 103 that can perform a seesaw motion relative to its middle portion. The primary locking mechanism completes step-by-step unlocking by alternately pressing the first pressing part 102 and the second pressing part 103. The primary locking plate 101 and the plug housing 1 are connected at the end... A socket 105 is formed between the surfaces, and a secondary locking piece 3 is movably inserted into the socket 105. An axially extending limiting strip 201 is provided on the end face of the socket housing 2. An axially extending first engaging arm 301 is provided at the distal end of the secondary locking piece 3. The distal end of the first engaging arm 301 has a slot 302 that matches the limiting strip 201. The secondary locking piece 3 drives the slot 302 to engage with the limiting strip 201 through axial movement, forming a secondary locking mechanism that locks the plug housing 1 and the socket housing 2 in the plugged state. When the plug housing 1 and the socket housing 2 are in the secondary locking state, the first engaging arm 301 is simultaneously located at the bottom of the first pressing part 102 and the second pressing part 103 to press against the primary locking piece 101 and lock the primary locking mechanism.

[0036] This design incorporates a primary locking plate 101 with elastically deformable ends to form a primary locking mechanism with a set of stops, thereby locking the insertion between the plug housing 1 and the socket housing 2. A secondary locking plate 3, capable of axial movement, is then used to further lock the insertion between the plug housing 1 and the socket housing 2. The length of the first latching arm 301 at the distal end of the secondary locking plate 3 is adapted to the primary locking plate 101. In the secondary locking state, the secondary locking plate 3 is simultaneously located at the bottom of the first pressing part 102 and the second pressing part 103, locking the plug housing 1 and the socket housing 2 while simultaneously pressing against the primary locking plate 101. By locking the primary locking plate 101, the locking effect of the primary locking mechanism is ensured, guaranteeing the stability and reliability of the insertion between the plug housing 1 and the socket housing 2 during use, and ensuring safe operation.

[0037] The set of stops on the socket housing 2 has two feasible embodiments. For example... Figures 1-8The diagram shows a first embodiment of a set of the stops. In the first embodiment, the set of stops includes a first stop 202 and a second stop 203. The first stop 202 and the second stop 203 have a distance difference in the axial direction (here, "axial direction" refers to the axial direction of the socket housing 2), and the first stop 202 is closer to the proximal end of the socket housing 2. The front end of the first pressing part 102 is provided with two clamping arms 109 facing each other. The inner ends 110 of the clamping arms 109 form a slot that can engage with the first stop 202. The two second stops 203 are respectively disposed on both sides of the first stop 202, and the outer ends 111 of the clamping arms 109 can engage with the second stops 203.

[0038] like Figure 9 The diagram shows a second embodiment of the set of stops. The difference between the second and first embodiments is that the first stop 202 and the second stop 203 are positioned differently in the axial direction. Specifically, in the second embodiment, the set of stops includes a first stop 202 and a second stop 203. The first stop 202 and the second stop 203 have a distance difference in the axial direction, and the second stop 203 is closer to the proximal end of the socket housing 2. The front end of the first pressing part 102 is provided with two clamping arms 109 facing each other. The inner end 110 of the clamping arm 109 can engage with the first stop 202. The two second stops 203 are respectively disposed on both sides of the first stop 202, and the outer end 111 of the clamping arm 109 can engage with the second stop 203.

[0039] The first stop 202 has a first driving ramp 2021 on its proximal bottom surface that can drive the inner end 110 downward, and the second stop 203 has a second driving ramp 2031 on its proximal top surface that can drive the outer end 111 upward. A first gap 100 is formed between the bottom surface of the first stop 202 and the end face of the socket housing 2, and the height of the first gap 100 is greater than the thickness of the inner end 110, so that the engagement between the inner end 110 and the first stop 202 can be unlocked by pressing down the first pressing part 102. A second gap 200 is formed between the bottom surface of the inner end 110 and the end face of the socket housing 2, and the height of the second stop 203 is greater than the second gap 200, so that the engagement between the outer end 111 and the second stop 203 can be unlocked by pressing down the second pressing part 103.

[0040] The first pressing part 102 and the second pressing part 103 have elasticity that allows for up-and-down elastic deformation, making the primary locking plate 101 essentially a seesaw structure that can pivot relative to its middle part. The clamping arm 109 is located at the front end of the primary locking plate 101, so the clamping arm 109 follows the primary locking plate 101 to pivot synchronously, and can generate an upward or downward movement.

[0041] Specifically, the working principle of the primary locking mechanism is as follows: (This is illustrated using a first embodiment with a set of baffles as an example) Figure 6 and Figure 7 As shown, the locking and engaging process of the plug housing 1 and the socket housing 2 includes two stages. In the first stage of the locking and engaging process, the first driving inclined surface 2021 drives the inner end 110 to move downwards to pass through the first gap 100. In the second stage of the locking and engaging process, the second driving inclined surface 2031 drives the outer end 111 to move upwards to pass over the second stop 203 to form a latch. At this time, the plug housing 1 and the socket housing 2 are engaged and locked. Due to the setting of the first gap 100, the first stage and the second stage can be smoothly connected, so that the plug housing 1 can be engaged with the socket housing 2 in one go through axial movement. In order to improve the smoothness of movement, the distal top surface of the inner end 110 is an inclined surface that matches the slope of the first driving inclined surface 2021, and the distal bottom surface of the outer end 111 is an inclined surface that matches the slope of the second driving inclined surface 2031.

[0042] The separation process of the plug housing 1 and the socket housing 2 in the locked state also includes two stages, namely, the reverse axial movement of the above-mentioned locking and engaging process. In the first stage of the locking and separating process, pressing the second pressing part 103 drives the outer end 111 to move upward and tilt up, thereby separating the outer end 111 from the second stop 203, completing the unlocking between the outer end 111 and the second stop 203. Due to the setting of the second gap 200, when the inner end 110 does not move down, it will be higher than the first gap 100, causing the inner end 110 to abut against the first stop 202 and unable to retract from the first gap 100. This makes it impossible for the plug housing 1 and the socket housing 2 to be separated in one go. Therefore, in the second stage of a locking and unlocking process, pressing the first pressing part 102 drives the inner end 110 to move downward, thereby causing the inner end 110 to separate from the first stop 202 and pass through the first gap 100, completing the unlocking between the inner end 110 and the first stop 202. At this time, the plug housing 1 moves further axially to complete the separation from the socket housing 2.

[0043] In a second embodiment of a set of stops, due to the change in the axial position of the first stop 202 and the second stop 203, the first stage of the insertion process is the engagement between the outer end 111 and the second stop 203, and the second stage of the insertion process is the engagement between the inner end 110 and the first stop 202. In the first stage of the separation process, the first pressing part 102 needs to be pressed first to complete the separation and unlocking between the inner end 110 and the first stop 202, and then the second pressing part 103 needs to be pressed to complete the separation and unlocking between the outer end 111 and the second stop 203. The principle will not be repeated here.

[0044] like Figure 8 As shown, after the plug housing 1 and socket housing 2 complete the first locking engagement, the secondary locking piece 3 is moved axially until it is fully inserted into the socket 105, at which point the slot 302 engages with the limiting strip 201, thus completing the secondary locking of the plug housing 1 and socket housing 2 in the engagement state. When it is necessary to remove the plug housing 1, the secondary locking piece 3 is first removed, and then the first pressing part 102 or the second pressing part 103 is pressed in the opposite direction to achieve step-by-step unlocking. To facilitate user operation, the outer surfaces of the secondary locking piece 3, the first pressing part 102, and the second pressing part 103 are marked with numbers according to the order of removal, so that the user can quickly unlock in sequence.

[0045] Preferably, the proximal end of the first stop 202 is fixedly connected to the distal end of the limiting strip 201. This structure allows the limiting strip 201 to guide the insertion of the primary locking piece 101 and ensures that the secondary locking piece 3, after being inserted, is located at the bottom of the primary locking piece 101 to press against it and form a locking effect. Furthermore, the first stop 202 is preferably located at the center line of the end face of the socket housing 2, and the two second stops 203 are symmetrically arranged relative to the first stop 202. The limiting strip 201 is also preferably located at the center line of the end face of the socket housing 2 to maximize the locking effect of the primary locking piece 101 and the secondary locking piece 3.

[0046] like Figure 3 , Figure 5As shown, the first locking arm 301 consists of two symmetrically spaced support arms 3011, forming the slot 302 between the two support arms 3011. The proximal end of the limiting locking strip 201 has a head 2011 wider than its extension. The two support arms 3011 are elastically movable relative to each other, forming an openable opening 3021 so that the head 2011 can be inserted into the slot 302. This structure allows the first locking arm 301 to engage with the limiting locking strip 201 by utilizing the elasticity of the support arms 3011 to open and close left and right, rather than the traditional up-and-down snapping method. This engagement method ensures the integrity of the first locking arm 301 and the slot 302 during movement, thereby ensuring the service life of the secondary locking plate and forming an effective and reliable engagement effect. A reinforcing rib 306 is provided at the connection between the first snap-fit ​​arm 301 and the front end of the secondary locking plate 3 to enhance the connection between the two. The thickness of the reinforcing rib 306 is greater than that of the first snap-fit ​​arm 302 to form a more effective clamping effect on the primary locking plate 101.

[0047] Furthermore, the inner wall of the support arm 3011 is recessed with a limiting recess 3013 that matches the head 2011. The head 2011 is engaged between the two limiting recesses 3013. The two sides of the proximal end of the head 2011, the two sides of the opening 3021, and the two sides of the limiting recess 3013 are all inclined surfaces with matching slopes to facilitate the engagement and disengagement of the limiting strip 201.

[0048] Symmetrically protruding protrusions 3012 are provided on the inner walls of the two support arms 3011. A limiting groove 303 is formed between the proximal end of the protrusion 3012 and the proximal end of the support arm 3011. An axially extending fixing block 106 is fixed on the end face of the plug housing 1. When the plug housing 1 and the socket housing 2 are in a secondary locking state, the fixing block 106 is located in the limiting groove 303. The two distal ends of the fixing block 106 and the two distal ends of the limiting groove 303 are inclined surfaces with the same slope. Since the slot 302 is opened by the support arms 3011 through left and right opening and closing, the fixing block 106 can assist in opening the protrusion 3012 when the secondary locking piece 3 is pulled out, forming an unlocking structure that is easy to open, so as to open the slot 302 and make the slot 302 quickly separate from the limiting strip 201, thereby improving the insertion and removal efficiency of the secondary locking piece 3.

[0049] Furthermore, axially extending second locking arms 304 are fixedly provided on both sides of the distal end of the secondary locking plate 3, and first locking blocks 107 are protruding on both side walls of the socket 105. The outer surface of the second locking arm 304 is recessed with a notch 3041 that matches the first locking block 107, so that when the plug housing 1 and the socket housing 2 are in a secondary locking state, the second locking arm 304 is engaged within the socket 105. The provision of the second locking arm 304 enhances the connection and fixation between the secondary locking plate 3 and the socket 105, ensuring the locking stability and reliability of the secondary locking plate 3.

[0050] The end face of the plug housing 1 forms a baffle wall directly opposite the proximal end of the socket 105 to prevent the secondary locking piece 3 from falling off, so that the secondary locking piece 3 is pre-installed in the plug housing 1 when not inserted. Furthermore, a first limiting block 305 may be provided at the top of the second locking arm 304 or the first locking arm 301, and a second limiting block 104 is provided on the inner wall of the top surface of the socket 105 to engage with the first limiting block 305 to limit the rearward movement limit of the secondary locking piece 3, preventing the secondary locking piece 3 from falling off.

[0051] Furthermore, the present invention also discloses a high-voltage connector, including the secondary locking mechanism described above, at least one pair of matched power male terminals 4 and power female terminals 5, and one pair of matched signal male terminals 6 and signal female terminals 7. The power female terminals 5 and signal male terminals 6 are respectively fixed within the plug housing 1, and the power male terminals 4 and signal female terminals 7 are respectively fixed within the socket housing 2. The distance between the pair of power male terminals 4 and power female terminals 5 is less than the distance between the pair of signal male terminals 6 and signal female terminals 7. This structural arrangement, in conjunction with the secondary locking mechanism, enables the step-by-step separation of the power terminals and signal terminals. Specifically, as shown... Figure 10 and Figure 11 As shown, this structure ensures that a pair of power male terminals 4 and power female terminals 5 are connected first, followed by a pair of signal male terminals 6 and signal female terminals 7; a pair of signal male terminals 6 and signal female terminals 7 are disconnected first; and a pair of power male terminals 4 and power female terminals 5 are disconnected last, avoiding hot-plugging and ensuring safe use.

[0052] In addition, the high-voltage connector also includes necessary structures such as a waterproof ring disposed at the far end of the socket housing 2 and the plug housing 1. This is existing technology and will not be described in detail here.

[0053] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0054] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A secondary locking mechanism, comprising a plug housing (1) and a socket housing (2) that are pluggable to each other, characterized in that: A primary locking piece (101) is mounted on one side end face of the plug housing (1), and a set of blocks is provided on the same side end face of the socket housing (2). The distal end of the primary locking piece (101) is engaged with the set of blocks to form a primary locking mechanism that locks the plug housing (1) and the socket housing (2) into an engaged state. The primary locking piece (101) extends straight and its middle part is fixedly connected to the plug housing (1). The distal end and proximal end of the primary locking piece (101) form a first pressing part (102) and a second pressing part (103) that can perform a seesaw action relative to its middle part. The primary locking mechanism completes step-by-step unlocking by alternately pressing the first pressing part (102) and the second pressing part (103). A socket (105) is formed between the primary locking piece (101) and the end face of the plug housing (1). A secondary locking piece (3) is movably inserted into the socket (105). An axially extending limiting strip (201) is provided on the end face of the socket housing (2). An axially extending first locking arm (301) is provided at the distal end of the secondary locking piece (3). The distal end of the first locking arm (301) has a slot (302) that matches the limiting strip (201). The piece (3) drives the slot (302) to engage with the limiting strip (201) through axial movement to form a secondary locking mechanism that locks the plug housing (1) and socket housing (2) in the plug-in state. When the plug housing (1) and socket housing (2) are in the secondary locking state, the first locking arm (301) is located at the bottom of the first pressing part (102) and the second pressing part (103) at the same time, so as to press the primary locking piece (101) to lock the primary locking mechanism. A set of the stops includes a first stop (202) and a second stop (203). The first stop (202) and the second stop (203) have a distance difference in the axial direction, and the first stop (202) is closer to the proximal end of the socket housing (2). The front end of the primary locking piece (101) is provided with two clamping arms (109) opposite to each other. The inner ends (110) of the clamping arms (109) form a bayonet that can engage with the first stop (202). The two second stops (203) are respectively disposed on both sides of the first stop (202), and the outer ends (111) of the clamping arms (109) can engage with the second stops (203). The first latching arm (301) is composed of two symmetrically spaced support arms (3011), and the slot (302) is formed between the two support arms (3011). The proximal end of the limiting latch (201) has a head (2011) with a width greater than its extension. The two support arms (3011) have relative elasticity to form an openable opening (3021) so that the head (2011) can be inserted into the slot (302).

2. The secondary locking mechanism according to claim 1, characterized in that: The first stop (202) has a first driving ramp (2021) on its near-end bottom surface that can drive the inner end (110) downward, and the second stop (203) has a second driving ramp (2031) on its near-end top surface that can drive the outer end (111) upward; a first gap (100) is formed between the bottom surface of the first stop (202) and the end face of the socket housing (2), and the height of the first gap (100) is greater than the thickness of the inner end (110), so as to This allows the engagement between the inner end (110) and the first stop (202) to be unlocked by pressing down the first pressing part (102); a second gap (200) is formed between the bottom surface of the inner end (110) and the end face of the socket housing (2), and the height of the second stop (203) is greater than the second gap (200), so that the engagement between the outer end (111) and the second stop (203) can be unlocked by pressing down the second pressing part (103).

3. The secondary locking mechanism according to claim 2, characterized in that: The proximal end of the first stop (202) is fixedly connected to the distal end of the limiting strip (201).

4. The secondary locking mechanism according to claim 3, characterized in that: The inner wall of the arm (3011) is recessed with a limiting recess (3013) that matches the head (2011). The head (2011) is engaged between the two limiting recesses (3013). The two sides of the proximal end of the head (2011), the two sides of the opening (3021), and the two sides of the limiting recess (3013) are all inclined surfaces with matching slopes.

5. A secondary locking mechanism according to claim 4, characterized in that: The inner walls of the two support arms (3011) are symmetrically provided with protrusions (3012). A limiting groove (303) is formed between the protrusion (3012) and the protrusion of the support arm (3011). An axially extending fixing block (106) is fixed on the end face of the plug housing (1). When the plug housing (1) and the socket housing (2) are in a secondary locking state, the fixing block (106) is located in the limiting groove (303). The two ends of the fixing block (106) and the two ends of the limiting groove (303) are inclined surfaces with the same slope.

6. The secondary locking mechanism according to claim 5, characterized in that: The secondary locking plate (3) is fixed with axially extending second locking arms (304) on both sides of its distal end. The two side walls of the socket (105) are provided with first locking blocks (107). The outer side surface of the second locking arm (304) is provided with a recess (3041) that matches the first locking block (107), so that when the plug housing (1) and the socket housing (2) are in the secondary locking state, the second locking arm (304) is locked in the socket (105).

7. A high-voltage connector, characterized in that: Includes a secondary locking mechanism as described in any one of claims 1-6, at least one pair of matched male power terminals (4) and female power terminals (5), and one pair of matched male signal terminals (6) and female signal terminals (7). The female power terminals (5) and male signal terminals (6) are respectively fixed in the plug housing (1), and the male power terminals (4) and female signal terminals (7) are respectively fixed in the socket housing (2). The distance between the pair of male power terminals (4) and female power terminals (5) is less than the distance between the pair of male signal terminals (6) and female signal terminals (7).

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