A BMS test device

Abstract

The present invention discloses a BMS testing device, which relates to the field of BMS testing. The test platform comprises a test platform, a carrier and a plug-in connection device are installed on the test platform, the plug-in connection device comprises a contour plug, a plug-in mechanism and a driving mechanism, the driving mechanism is used to drive the plug-in mechanism to move along the plug-in direction, the plug-in mechanism comprises a fixed end and a free end, the fixed end is connected to the driving mechanism, the fixed end and the free end are connected by an elastic member, the free end is connected to the contour plug, and the elastic member connects the fixed end and the free end through the provided plug-in connection device, so that the contour plug has axial movement, radial translation and multi-directional torsion capabilities, during the insertion process, the elastic member can dynamically absorb the position deviation of the BMS socket, avoid hard squeezing of the contour plug and the socket, significantly reduce the risks of deformation of the metal contact of the socket, scratching of the coating and desoldering of the PCB solder joints, improve the yield of the BMS product after the test, and extend the service life of the contour plug.

Description

Technical Field

[0001] The present invention relates to a BMS testing technology, and in particular to a BMS testing device. Background Art

[0002] Battery management systems (BMS) require final testing after production to ensure that all performance and functionality meet design requirements before delivery. Existing BMS product testing typically involves manually inserting a shaped plug used to connect the testing equipment into the BMS product's socket, resulting in low testing efficiency and high costs. Chinese utility model patent publication number CN206292383U discloses a BMS testing device that utilizes a test workbench, a BMS testing device, and a floating lift positioning device to automate BMS product testing, significantly improving work efficiency. However, since BMS product sockets typically have a certain degree of positional deviation during soldering, the shaped plug has a fixed direction of linear movement. While the shaped plug can still stably enter the socket with this deviation due to its chamfered design, the insertion process can easily force the BMS socket, causing damage to the socket and the shaped plug, impacting the quality of the tested BMS product and the service life of the testing device (shaped plug). Summary of the Invention

[0003] The object of the present invention is to provide a BMS testing device to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: A BMS testing device, comprising a test platform, on which a carrier and a plug-in connection device are installed, wherein the carrier is used to carry the BMS product to be tested, and the plug-in connection device includes a contoured plug, a plug-in mechanism and a driving mechanism, wherein the driving mechanism is used to drive the plug-in mechanism to move along the plug-in direction, and the plug-in mechanism includes a fixed end and a free end, wherein the fixed end is connected to the driving mechanism, and the fixed end and the free end are connected by an elastic member, and the free end is connected to the contoured plug, wherein the elastic member provides the free end with the ability to move in the plug-in direction, the ability to translate perpendicular to the plug-in direction, and the ability to twist.

[0005] Furthermore, the elastic member is a coil spring, and in a free state, the coil spring can keep the free end in a fixed posture.

[0006] Furthermore, the elastic member is an elastic connecting block made of rubber or polyurethane, and the middle of the connecting block is hollow.

[0007] Furthermore, a reset component is provided between the free end and the fixed end.

[0008] Furthermore, the reset assembly includes an L-shaped rod, a sliding seat and a guide platform. The L-shaped rod is fixedly installed on one side of the free end. The sliding seat is slidably connected to the fixed end, and the sliding direction is the plug-in direction. The guide platform is fixedly installed on one side of the sliding seat. The end of the L-shaped rod is fixedly connected to a guide rod. A connected limiting groove and a movable groove are provided on one side of the guide platform. When the guide rod is in the limiting groove, the free end is supported by the L-shaped rod. When the guide rod is in the movable groove, the free end is not supported.

[0009] Furthermore, the movable slot is inclined, and the inclination direction is from the limiting slot to the fixed end.

[0010] Furthermore, the maximum movement stroke of the sliding seat relative to the fixed end is greater than the movement stroke required for the guide rod to enter the movable groove from the limiting groove.

[0011] Furthermore, a push rod is installed in the sliding seat, which passes through the fixed end and is slidably connected to the inner wall of the fixed end. The push rod can move in the elastic member, and when the sliding seat abuts against one side of the fixed end, the end of the push rod abuts against one side of the free end or has a gap.

[0012] Furthermore, the contoured plugs and plug-in mechanisms are provided in multiple groups, and are synchronously driven by a driving mechanism.

[0013] Furthermore, the driving mechanism includes a mounting frame, which is provided with a mounting groove, and the sliding seat is slidably installed in the mounting groove. Slides are installed at the bottom of both ends of the mounting frame, and the slides are slidably connected to slide rails. The slide rails are installed on the surface of the test platform, and the slide rails are arranged along the plug-in and pull-out direction. One side of the mounting frame is connected to the driving component.

[0014] Compared with the prior art, the BMS testing device provided by the present invention has the following beneficial effects:

[0015] 1. Through the plug-in connection device, the elastic part connects the fixed end and the free end, so that the contoured plug has the ability of axial movement, radial translation and multi-directional torsion. During the insertion process, the elastic part can dynamically absorb the position deviation of the BMS socket, avoid the hard squeezing of the contoured plug and the socket, and significantly reduce the risk of deformation of the socket metal contacts, plating scratches and PCB solder joint desoldering, thereby improving the yield of BMS products after testing and extending the service life of the contoured plug.

[0016] 2. Through the reset component, the guide rod locks the free end posture in the limit groove and is forced to reset to the initial position after being pulled out. This can further overcome the positioning error of the elastomer after long-term testing and ensure the repeatability of multiple tests.

[0017] 3. The push rod is provided to transmit the driving force to the free end at the initial stage of insertion to avoid excessive compression of the elastic part. When the sliding seat abuts the fixed end, the gap between the push rod and the free end disappears, and the thrust is directly provided, which not only ensures that the floating freedom is not restricted, but also reduces the stress fatigue of the elastic part and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the structure of a BMS test device provided by an embodiment of the present invention from a first perspective;

[0020] Figure 2 A schematic diagram of the BMS test device structure from a second perspective provided by an embodiment of the present invention;

[0021] Figure 3 A schematic structural diagram of a plug-and-connect device provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the plugging and unplugging directions of the contoured plug provided in an embodiment of the present invention;

[0023] Figure 5 The embodiment of the present invention provides Figure 3 Schematic diagram of the upward-looking state;

[0024] Figure 6 The embodiment of the present invention provides Figure 3 Schematic diagram of the longitudinal structure;

[0025] Figure 7 A schematic structural diagram of a plug-in connection device when the elastic member provided in an embodiment of the present invention is a coil spring;

[0026] Figure 8 A schematic diagram of a structure in which multiple groups of square plugs are provided in an embodiment of the present invention;

[0027] Figure 9 A schematic diagram of the state of a BMS socket position offset provided by an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Test platform; 2. Carrier; 3. Contoured plug; 4. Plug-in mechanism; 41. Fixed end; 42. Free end; 43. Elastic member; 431. Coil spring; 432. Connecting block; 44. Reset assembly; 441. L-shaped rod; 442. Sliding seat; 443. Guide platform; 444. Guide rod; 445. Limiting groove; 446. Movable groove; 447. Push rod; 5. Driving mechanism; 51. Mounting frame; 52. Mounting groove; 53. Slide platform; 54. Slide rail; 55. Driving member; 6. Plug-in direction;

[0030] 100. BMS product; 101. socket. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] For examples, see Figures 1-9 A BMS testing device includes a test platform 1 and a carrier 2 and a plug-in connection device installed on the test platform 1, wherein the carrier 2 is used to carry the BMS product 100 to be tested, and the plug-in connection device includes a contoured plug 3, a plug-in mechanism 4 and a driving mechanism 5, the driving mechanism 5 is used to drive the plug-in mechanism 4 to move along the plug-in direction 6, the plug-in mechanism 4 includes a fixed end 41 and a free end 42, the fixed end 41 is connected to the driving mechanism 5, the fixed end 41 and the free end 42 are connected by an elastic member 43, and the free end 42 is connected to the contoured plug 3, wherein the elastic member 43 provides the free end 42 with the ability to move in the plug-in direction 6, the ability to translate perpendicular to the plug-in direction 6, and the ability to torsion.

[0033] In one embodiment of the present invention, the elastic member 43 is a coil spring 431. Figure 7 In the free state, the coil spring 431 can keep the free end 42 in a fixed posture.

[0034] It should be noted that the specific direction of the plugging and unplugging direction 6 is not limited in the solution, and includes but is not limited to the horizontal direction and the vertical direction.

[0035] The state of the free end 42 during use is described below:

[0036] First, see Figure 9 , which exemplarily shows several typical states where the socket 101 has position deviation relative to the contoured plug 3, wherein: Figure 9 The a in the figure indicates the standard position of socket 101 (red dotted line). Figure 9 The situations b and c do not involve the situation that the profiling plug 3 needs to be twisted. It should be understood that under the chamfer setting of the profiling plug 3, the position deviation does not affect the insertion of the profiling plug 3. Figure 9The cases shown each have a different hard crush injury.

[0037] for Figure 9 In Figures b and c, when the profiling plug 3 is inserted, the free end 42 will perform a translation motion perpendicular to the opposite direction of the plugging and unplugging direction and a movement motion along the plugging and unplugging direction 6. For ease of understanding and subsequent description, the plugging and unplugging direction 6 is defined as the Z-axis direction, and the perpendicular directions to the plugging and unplugging direction 6 in Figures b and c are the X-axis direction and the Y-axis direction, respectively. Figure 4 ;

[0038] That is, during the insertion / removal process of the contoured plug 3, the coil spring 431 moves in the Z-axis direction, allowing the contoured plug 3 to be compressed / stretched a certain distance in the insertion / removal direction, thereby absorbing axial alignment deviation and overtravel. The coil spring 431 moves in the X / Y-axis direction, allowing the contoured plug 3 to make a small range of translation perpendicular to the insertion direction, thereby absorbing lateral deviation of the connector center position. During the insertion and removal process, the coil spring 431 also allows the contoured plug 3 to swing slightly around the X-axis and Y-axis (pitch and yaw), thereby absorbing angular deviation of the connector plane.

[0039] for Figure 9 In d and e, the coil spring 431 can, in addition to the above-mentioned actions, also perform a small twisting around the Z axis, thereby reducing damage to the socket 101 and the contoured plug 3 during the plugging and unplugging process, and reducing the possibility of damage (such as desoldering) to the connection between the socket 101 and the circuit board due to prolonged exposure to high extrusion pressure during testing (such as aging, which requires a long testing time).

[0040] It should be noted that for the convenience of illustration, Figure 9 The degree of displacement of the plug position is exaggerated in the figure; since the posture of the profiling plug 3 needs to be relatively fixed after plugging and unplugging, so that the profiling plug 3 can be aligned with the socket 101 during the next plugging and unplugging test, and to prevent the free end 42 from continuously shaking under the influence of the coil spring 431 under the drive of the driving mechanism 5, affecting the accurate insertion of the profiling plug 3 into the socket 101, when the coil spring 431 is used alone, the performance design of the coil spring 431 should be considered, for example:

[0041] As for the material, since the degree of movement or torsion involved in the plugging and unplugging process is small, the material of the coil spring 431 is preferably music wire or oil-quenched and tempered spring steel wire to obtain better strength and fatigue resistance;

[0042] Regarding the working stroke, the coil spring 431 should still have a compression or extension stroke that can move at least a certain distance in a free state;

[0043] Regarding the size of the coil spring 431 , the total weight of the free end 42 and the contoured plug 3 should be considered. The coil spring 431 can restore the free end 42 to a fixed posture in a free state after being loaded.

[0044] In one embodiment of the present invention, another specific example of the elastic member 43 is provided. The elastic member 43 may also be an elastic connecting block 432 made of rubber or polyurethane. The middle portion of the connecting block 432 is hollow, forming a hollow cylinder or prism, that is, having an axial through hole, thereby increasing its floating ability. The hardness of the connecting block 432 is preferably 70A to 90A (Shore A hardness). When the hardness is lower than 70A, the stability of the posture after removal is affected. When the hardness is higher than 90A, the elasticity is reduced, affecting the floating ability. The advantage of using the elastic connecting block 432 is that it has a certain creep ability, thereby achieving a floating ability that is better than the coil spring 431 and making the sensitivity of the sensing socket 101 deviation during the insertion and removal of the contoured plug 3 higher. However, the disadvantage is that in the free state, the connecting block 432 is difficult to restore to a posture that can be aligned with the socket 101 under load. Although it can restore to a fixed posture that does not affect insertion and removal after a limited number of uses, it will slowly deform due to fatigue over a long period of use, causing the subsequent posture position to gradually drift.

[0045] Therefore, when using the connecting block 432, it is preferred to use a method of plugging and unplugging in a vertical direction to reduce the deformation effect of the weight of the free end 42 on the connecting block 432. In the vertical method, the weight of the free end 42 is along the plugging and unplugging direction 6, and thus has no component in the plugging and unplugging direction 6, which has a smaller effect on the connecting block 432. At the same time, the vertical direction is also applicable to the embodiment using the coil spring 431. However, using the vertical direction as the plugging and unplugging direction 6 will also increase the longitudinal space of the test device, which may not be applicable in some scenarios. In addition, for the method using the connecting block 432, vertical plugging and unplugging cannot completely eliminate the effects of fatigue deformation. Regular inspection and adjustment of the state of the connecting block 432 are still required to ensure test accuracy and repeatability. Based on this, without limiting the specific direction of the plugging and unplugging direction 6, a reset assembly 44 can also be provided to improve the stability of this method. After the contour plug 3 is unplugged, the reset assembly 44 adjusts the posture of the free end 42 to the initial posture (the originally required fixed posture). After the contour plug 3 is at least partially inserted into the socket 101, the free end 42 is released to allow it to float.

[0046] Specifically, such as Figure 5As shown, the reset assembly 44 is arranged between the free end 42 and the fixed end 41, and includes an L-shaped rod 441, a sliding seat 442 and a guide platform 443. The L-shaped rod 441 is fixedly installed on one side of the free end 42, the sliding seat 442 is slidably connected to the fixed end 41, and the sliding direction is the plug-in direction 6, the guide platform 443 is fixedly installed on one side of the sliding seat 442, the end of the L-shaped rod 441 is fixedly connected to the guide rod 444, and one side of the guide platform 443 is provided with a connected limiting groove 445 and a movable groove 446. When the guide rod 444 is located in the limiting groove 445, the free end 42 is supported by the L-shaped rod 441. When the guide rod 444 is located in the movable groove 446, the free end 42 is not supported. The movable groove 446 is inclined, and the inclined direction is from the limiting groove 445 to the fixed end 41.

[0047] The movable groove 446 of the reset assembly 44 adopts an inclined design, so that the guide rod 444 can smoothly release the free end 42 during the insertion stage and be forcibly pulled back and locked during the removal stage. This mechanism is applicable to both horizontal and vertical insertion and removal directions, effectively solving the problem of Figure 9 The torsional deviation conditions shown cover a variety of typical position offset scenarios.

[0048] The reset assembly 44 is provided with one or two or three or four groups. Taking the plugging direction 6 as the horizontal direction, when only one group of reset assembly 44 is provided, it is located below the plugging mechanism 4. Figure 6 As shown, when the contoured plug 3 is pulled out, the guide rod 444 slides from the movable groove 446 into the limit groove 445, and the guide rod 444 supports the free end 42 to return to the initial posture; when the contoured plug 3 is inserted, the guide rod 444 slides back into the movable groove 446, releasing the free end 42 to float; if two groups of reset components 44 are provided, they can be provided on the upper and lower sides of the plug-in mechanism 4 and distributed symmetrically; if three or four groups of reset components 44 are provided, they are evenly distributed around the plug-in mechanism 4, and when the plug-in direction 6 is horizontal, only one group of reset components 44 is provided below the plug-in mechanism 4; when the plug-in direction 6 is vertical, at least two groups are provided and are symmetrically distributed on opposite sides of the plug-in mechanism 4.

[0049] In one embodiment of the present invention, Figure 5 The illustrated embodiment shows a situation where a set of reset components 44 is provided and located below the plug-in mechanism 4. The specific implementation scenario is as follows:

[0050] During the insertion phase, the contour plug 3 moves toward the socket 101 (plugging direction 6) under the drive of the driving mechanism 5. When the contour plug 3 at least partially enters the socket 101, the movement resistance increases, and the sliding seat 442 can move relative to the fixed end 41 until the sliding seat 442 abuts against the fixed end 41. The movement of the sliding seat 442 will push the fixed end 41 to move further, and when the sliding seat 442 abuts against one side of the fixed end 41, the guide rod 444 connected to the L-shaped rod 441 slides down into the movable groove driven by the sliding seat 442. 446, releasing the free end 42 to float. That is, the distance that the sliding seat 442 can move relative to the fixed end 41 is related to the distance that the guide rod 444 moves from the limiting groove 445 to the movable groove 446. That is, the maximum movement distance of the sliding seat 442 relative to the fixed end 41 is greater than the movement distance required for the guide rod 444 to move from the limiting groove 445 to the movable groove 446. As the contoured plug 3 continues to be inserted, the free end 42 gradually adapts to the posture of the socket 101 in a floating state until it is fully inserted, thereby completing the insertion process.

[0051] During the unplugging stage, after the test is completed, the driving mechanism 5 drives the contour plug 3 to move in the opposite direction, and the guide rod 444 slides from the movable groove 446 into the limit groove 445. After the guide rod 444 slides into the limit groove 445, the L-shaped rod 441 can apply a certain pulling force to the free end 42, assisting the free end 42 to drive the contour plug 3 to be unplugged, and preventing the elastic member 43 from being damaged by excessive pulling force. At the same time, when the guide rod 444 is in the limit groove 445, it will also support the free end 42 through the L-shaped rod 441, so that the posture of the free end 42 returns to the initial position after the contour plug 3 is unplugged, so that the contour plug 3 can be accurately aligned when inserted next time, thereby improving the plugging and unplugging efficiency and the service life of the equipment.

[0052] During the insertion process, the force exerted by the free end 42 on the insertion of the contoured plug 3 comes from the force transmitted by the fixed end 41 through elasticity. During the insertion process, the elastic member 43 is generally compressed to a certain extent, which will affect the floating ability of the elastic member 43 during the insertion process. In one embodiment of the present invention, a further solution to this problem is provided on the basis of setting a reset component 44. Specifically, a push rod 447 is installed in the sliding seat 442. The push rod 447 passes through the fixed end 41 and is slidably connected to the inner wall of the fixed end 41. The push rod 447 can move in the elastic member 43, and the diameter of the push rod 447 is smaller than that of the spiral elastic member 43. The inner diameter of the spring 431 or the diameter of the hollow part of the connecting block 432 is selected to reserve its deformation space, and when the sliding seat 442 abuts against one side of the fixed end 41, the end of the push rod 447 abuts against one side of the free end 42 or has a gap, which allows the elastic member 43 to be slightly compressed. During the insertion of the contoured plug 3 into the socket 101, the push rod 447 provides a thrust to the free end 42 or provides a thrust to the free end 42 after the elastic member 43 is compressed to disappear the gap, so as to avoid excessive compression of the elastic member 43 during the insertion of the contoured plug 3, ensure the floating ability of the free end 42, improve the insertion accuracy and stability, and extend the service life of the elastic member 43.

[0053] After the contoured plug 3 is inserted, the driving mechanism 5 drives the sliding seat 442 to move in the reverse direction, so that the push rod 447 is separated from the free end 42 and a gap is left, so that the free end 42 can maintain a floating state.

[0054] In one embodiment of the present invention, the driving mechanism 5 is a general linear movement mechanism.

[0055] In one embodiment of the present invention, the contoured plug 3 and the plug-in mechanism 4 may be provided in multiple groups, such as Figure 8 As shown, a general BMS product 100 has a plurality of sockets 101 , and the number of the contour plugs 3 can be set to be the same as the number of the sockets 101 , which can be synchronously driven by the driving mechanism 5 ;

[0056] Specifically, the driving mechanism 5 includes a mounting frame 51, which is provided with a mounting groove 52. The sliding seat 442 is slidably installed in the mounting groove 52. Slides 53 are installed at the bottom of both ends of the mounting frame 51. The slide 53 is slidably connected to a slide rail 54. The slide rail 54 is installed on the surface of the test platform 1, and the slide rail 54 is arranged along the plug-in direction 6. One side of the mounting frame 51 is connected to a driving member 55. The driving member 55 is a cylinder, a hydraulic cylinder or an electric telescopic rod. The driving member 55 is not drawn in the figure.

[0057] The way in which the carrier 2 carries the BMS product 100 is the existing technology, such as setting a placement slot that is adapted to the size of the BMS product 100, or setting a clamping member to clamp it. When the specifications of the BMS product 100 change, the present test device can also set the carrier 2 to be liftable, that is, the carrier 2 can move in a direction perpendicular to the plane where the test platform 1 is located, and adjust the position of the socket 101 in different BMS products 100 so that it is aligned with the plug of the plug-in connection device. It should be understood that the above are all conventional settings and choices of the existing technology. Not all methods are shown in the figure, and only the method of setting a placement slot is used as an example. In some other embodiments, corresponding selections can be made according to actual needs.

[0058] It should be understood that the testing device provided by the present invention can not only test the BMS product 100, but also other products with similar plug-in and unplugging methods.

[0059] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the present invention.

Claims

1. A BMS testing device, comprising a testing platform (1), characterized in that: A carrier (2) and a plug-in connection device are installed on the test platform (1), wherein the carrier (2) is used to carry the BMS product (100) to be tested, and the plug-in connection device includes a contoured plug (3), a plug-in mechanism (4) and a driving mechanism (5), wherein the driving mechanism (5) is used to drive the plug-in mechanism (4) to move along the plug-in direction (6), and the plug-in mechanism (4) includes a fixed end (41) and a free end (42), wherein the fixed end (41) is connected to the driving mechanism (5), and the fixed end (41) and the free end (42) are connected via an elastic member (43), and the free end (42) is connected to the contoured plug (3), wherein the elastic member (43) provides the free end (42) with the ability to move in the plug-in direction (6), the ability to translate perpendicular to the plug-in direction (6), and the ability to twist; A reset assembly (44) is provided between the free end (42) and the fixed end (41), and the reset assembly (44) comprises an L-shaped rod (441), a sliding seat (442) and a guide platform (443). The L-shaped rod (441) is fixedly mounted on one side of the free end (42), the sliding seat (442) is slidably connected to the fixed end (41), and the sliding direction is the plugging and unplugging direction (6). The guide platform (443) is fixedly mounted on one side of the sliding seat (442), and the end of the L-shaped rod (441) is fixedly connected to a guide rod (444). A communicating limiting groove (445) and a movable groove (446) are provided on one side of the guide platform (443). When the guide rod (444) is located in the limiting groove (445), the free end (42) is supported by the L-shaped rod (441). When the guide rod (444) is located in the movable groove (446), the free end (42) is not supported.

2. A BMS testing device according to claim 1, characterized in that: The elastic member (43) is a coil spring (431), and in a free state, the coil spring (431) can keep the free end (42) in a fixed posture.

3. A BMS testing device according to claim 1, characterized in that: The elastic member (43) is an elastic connecting block (432) made of rubber or polyurethane, and the middle of the connecting block (432) is hollow.

4. A BMS testing device according to claim 1, characterized in that: The movable groove (446) is inclined, and the inclination direction is from the limiting groove (445) to the fixed end (41).

5. A BMS testing device according to claim 1, characterized in that: The maximum movement stroke of the sliding seat (442) relative to the fixed end (41) is greater than the movement stroke required for the guide rod (444) to enter the movable groove (446) from the limiting groove (445).

6. A BMS testing device according to claim 1, characterized in that: A push rod (447) is installed in the sliding seat (442). The push rod (447) passes through the fixed end (41) and is slidably connected to the inner wall of the fixed end (41). The push rod (447) can move in the elastic member (43), and when the sliding seat (442) abuts against one side of the fixed end (41), the end of the push rod (447) abuts against one side of the free end (42) or has a gap.

7. A BMS testing device according to claim 1, characterized in that: The contoured plugs (3) and the plug-in mechanisms (4) are provided in multiple groups, and are synchronously driven by a driving mechanism (5).

8. A BMS testing device according to claim 7, characterized in that: The driving mechanism (5) includes a mounting frame (51), a mounting groove (52) is provided on the mounting frame (51), a sliding seat (442) is slidably installed in the mounting groove (52), a slide table (53) is installed at the bottom of both ends of the mounting frame (51), the slide table (53) is slidably connected to a slide rail (54), the slide rail (54) is installed on the surface of the test platform (1), and the slide rail (54) is arranged along the plug-in direction (6), and one side of the mounting frame (51) is connected to the driving member (55).

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