Welding spot detection system of battery pack for brushless motor

Abstract

The utility model discloses a welding spot detection system of a battery pack for a brushless motor, which belongs to the technical field of battery detection and comprises a detection system body, a first driving mechanism, a second driving mechanism, a detection mechanism, a current detector, a positioning detector, a data acquisition module, a central processing unit and a communication module. Through the mode, the positioning detector firstly detects the position of the detection system main body and then transmits a signal to the data acquisition module, the data acquisition module transmits the signal to the central processing unit, the central processing unit issues an instruction to the first driving mechanism and the second driving mechanism, and the first driving mechanism and the second driving mechanism start to move; the detection mechanism is driven to be specifically positioned to the position of the detection system main body, the current detector detects the detection system main body, then the current detector transmits a detection result to the data acquisition module, the data acquisition module transmits the detection result to the communication module, and the communication module uploads the detection result to a background terminal.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to a welding point detection system for a battery pack for a brushless motor. Background Art

[0002] The quality of solder joints is directly related to the quality and safety performance of batteries. Currently, most of the detection systems on the market only test one solder joint or perform random inspections. Their detection efficiency is low and cannot meet production needs.

[0003] Among numerous patent documents, Chinese patent CN109387569A discloses an automatic solder joint quality detection system, which includes an ultrasonic detection device, an industrial computer, a robot, a camera device, and a host computer. The host computer processes the image signal of the solder joint to be detected obtained by the camera device, calculates the distance between the ultrasonic probe and the solder joint to be detected, controls the robot by the industrial computer to drive the ultrasonic probe installed on the robot to aim at the solder joint to be detected, and controls the ultrasonic detection device to transmit and receive ultrasonic signals. The host computer processes the ultrasonic echo signal to evaluate the quality of the solder joint to be detected, thereby realizing online automatic detection of the solder joint quality.

[0004] However, it is not possible to detect the solder joints of batteries of various sizes, and the solder joints cannot be accurately located.

[0005] Based on this, the utility model designs a welding point detection system for a battery pack for a brushless motor to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a welding point detection system for a battery pack for a brushless motor.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A welding spot detection system for a battery pack for a brushless motor includes a detection system body, and also includes the following components: a first drive mechanism, a second drive mechanism, a detection mechanism, a current detector, a positioning detector, a data acquisition module, a central processing unit, and a communication module;

[0009] The first driving mechanism is installed on the detection system body;

[0010] The second driving mechanism is installed on the detection system body, and the second driving mechanism is connected to the first driving mechanism;

[0011] The detection mechanism is installed on the detection system body, and the detection mechanism is connected to the second driving mechanism and the first driving mechanism;

[0012] The current detector is installed on the detection mechanism; the current detector is used to detect the current, and the current detector is connected to the detection system body;

[0013] The positioning detector is installed on the detection mechanism; the positioning detector is used to locate the position of the detection system body;

[0014] The data acquisition module is electrically connected to the current detector and the positioning detector. The data acquisition module is used to collect the current and position data of the detection system body. The data acquisition module is installed on the detection system body.

[0015] The central processing unit is electrically connected to the current detector, the positioning detector, and the data acquisition module. The central processing unit is connected to the first driving mechanism and the second driving mechanism. The central processing unit is used to receive information collected by the data acquisition module and issue instructions to the first driving mechanism and the second driving mechanism.

[0016] The communication module is electrically connected to the data acquisition module, and is used to receive the data collected by the data acquisition module and transmit the collected information back to the background terminal in real time. The communication module is connected to the main body of the detection system.

[0017] Furthermore, the detection system body includes a shell, a battery pack storage compartment, a battery pack and a welding point; the shell is slidably connected to the battery pack storage compartment, the battery pack is arranged in the battery pack storage compartment, the battery pack is fixedly connected to the welding point, the shell is connected to the first driving mechanism and the second driving mechanism, and the welding point is connected to the detection mechanism.

[0018] Furthermore, the first driving mechanism includes a first motor, a rotating rod, a mounting sleeve, a rotating shaft, a connecting rod, a main bevel gear and a slave bevel gear. The mounting sleeve, the rotating shaft, the connecting rod, the main bevel gear and the slave bevel gear are each provided with two groups respectively located at the left and right ends of the rotating rod. The first motor is fixedly mounted on the housing, the output end of the first motor is fixedly connected to the rotating rod, a convex strip is fixedly mounted on the rotating rod, a groove which is slidably connected with the convex strip is provided on the mounting sleeve, the mounting sleeve is fixedly connected to the main bevel gear, the inner end of the rotating shaft is rotatably connected to the mounting sleeve, the outer end of the rotating shaft is rotatably connected to the connecting rod, the connecting rod on the left is connected to the second driving mechanism and the detection mechanism on the left, the main bevel gear is meshedly connected to the slave bevel gear, and the slave bevel gear on the left is connected to the detection mechanism on the left.

[0019] Furthermore, the second driving mechanism includes a second motor, a bidirectional threaded rod, a moving block, a cross bar and a slider. The moving block is provided with two groups, which are respectively located on the left and right sides of the bidirectional threaded rod and are threadedly connected to the bidirectional threaded rod. The moving blocks on the left and right sides move in opposite directions. The slider is provided with two groups, which are respectively located on the left and right sides of the cross bar and are slidably connected to the cross bar. The second motor is fixedly installed on the outer wall of the shell, the output end of the second motor is fixedly connected to the bidirectional threaded rod, the moving block on the left is fixedly connected to the connecting rod on the left, the cross bar is fixedly installed on the inner wall of the shell, and the slider on the left is connected to the detection mechanism on the left.

[0020] Furthermore, the detection mechanism includes an installation box, a threaded rod, a fixed rod, a mounting block, a first connecting rod, a second connecting rod, a protrusion and a spring contact. The installation box is rotatably connected to the threaded rod. The installation box, the threaded rod, the fixed rod, the mounting block, the first connecting rod, the second connecting rod, the protrusion and the spring contact are all provided in two groups and are located on the left and right sides of the shell. The threaded rod on the left is fixedly connected to the left bevel gear, the installation box on the left is fixedly connected to the connecting rod on the left, the threaded rod is threadedly connected to the front end mounting block, the threaded rod on the left is rotatably connected to the left connecting rod, the threaded rod on the left is rotatably connected to the left slider, each group of fixed rods is provided with two fixedly installed in the installation box and slidably connected to the installation block, the first connecting rod is fixedly connected to the rear end of the installation box, the second connecting rod is provided with multiple blocks and are all hinged, the first connecting rod and the second connecting rod are rotatably connected, the second connecting rod is rotatably connected to the mounting block, the mounting block is fixedly connected to the protrusion, the spring contact is fixedly installed on the protrusion, and the spring contact is contact-connected with the welding point.

[0021] Furthermore, the current detector is fixedly mounted on each spring contact, and the current detector is contact-connected with the welding point.

[0022] Furthermore, the positioning detector is fixedly mounted on each spring contact.

[0023] Furthermore, the data acquisition module is fixedly mounted on the outer wall of the installation box, and the data acquisition module is electrically connected to the first motor and the second motor.

[0024] Furthermore, the central processing unit is fixedly mounted on the first motor, and the central processing unit is electrically connected to the first motor and the second motor.

[0025] Furthermore, the communication module is fixedly mounted on the outer wall of the shell.

[0026] The utility model has the following technical effects:

[0027] 1. When the utility model is in use, the positioning detector first detects the position of the welding point, and then the positioning detector transmits the signal to the data acquisition module, the data acquisition module transmits the signal to the central processing unit, the central processing unit makes a judgment, and issues instructions to the first motor and the second motor, the first motor and the second motor start to move, and drive the spring contact to specifically locate the position of the welding point, the current detector detects the welding point, and then the current detector transmits the detection result to the data acquisition module, the data acquisition module transmits it to the communication module, and the communication module uploads it to the background terminal.

[0028] 2. When the utility model is in use, the first motor receives an instruction from the central processing unit and starts to drive the rotating rod to move, the rotating rod drives the mounting sleeve to move, the mounting sleeve drives the main bevel gear to move, the main bevel gear drives the slave bevel gear to move, the second motor receives an instruction from the central processing unit, the second motor drives the bidirectional threaded rod to move, the bidirectional threaded rod drives the two groups of moving blocks to move in opposite directions, the two groups of moving blocks drive the two groups of connecting rods to move together, thereby adjusting the distance in the middle.

[0029] 3. When the utility model is in use, the connecting rod drives the installation box to start moving, and the rotation of the bevel gear drives the threaded rod to move together. The threaded rod drives the installation block to move, thereby adjusting the distance between the installation blocks. The first connecting rod and the second connecting rod limit the installation block to make regular movements, so that the spring contact can accurately position the welding point. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a block diagram of a welding point detection system for a battery pack for a brushless motor according to the utility model;

[0032] Figure 2 A three-dimensional diagram of a welding point detection system for a battery pack for a brushless motor according to the utility model;

[0033] Figure 3 It is a front view of a welding point detection system for a battery pack for a brushless motor according to the utility model;

[0034] Figure 4 This is a left view of a welding point detection system for a battery pack for a brushless motor according to the utility model;

[0035] Figure 5 For along Figure 4 BB direction cross-sectional view;

[0036] Figure 6 For along Figure 3 AA direction cross-sectional view.

[0037] The numbers in the figure represent:

[0038] 1. Detection system body; 11. Shell; 12. Battery pack storage compartment; 13. Battery pack; 14. Solder point; 2. First drive mechanism; 21. First motor; 22. Rotating rod; 23. Mounting sleeve; 24. Rotating shaft; 25. Connecting rod; 26. Main bevel gear; 27. Slave bevel gear; 3. Second drive mechanism; 31. Second motor; 32. Bidirectional threaded rod; 33. Moving block; 34. Cross bar; 35. Slider; 4. Detection mechanism; 41. Mounting box; 42. Threaded rod; 43. Fixed rod; 44. Mounting block; 45. First connecting rod; 46. Second connecting rod; 47. Bump; 48. Spring contact; 5. Current detector; 6. Positioning detector; 7. Data acquisition module; 8. Central processing unit; 9. Communication module. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] The utility model is further described below in conjunction with embodiments.

[0041] In some embodiments, please refer to the attached instructions. Figure 1-6A welding spot detection system for a battery pack for a brushless motor also includes the following components: a first drive mechanism 2, a second drive mechanism 3, a detection mechanism 4, a current detector 5, a positioning detector 6, a data acquisition module 7, a central processing unit 8 and a communication module 9; the first drive mechanism 2 is installed on the detection system body 1; the second drive mechanism 3 is installed on the detection system body 1, and the second drive mechanism 3 is connected to the first drive mechanism 2; the detection mechanism 4 is installed on the detection system body 1, and the detection mechanism 4 is connected to the second drive mechanism 3 and the first drive mechanism 2; the current detector 5 is installed on the detection mechanism 4; the current detector 5 is used to detect the current, and the current detector 5 is connected to the detection system body 1; the positioning detector 6 is installed on the detection mechanism 4; the positioning detector 6 is used to The position of the detection system body 1 is positioned; the data acquisition module 7 is electrically connected to the current detector 5 and the positioning detector 6, and the data acquisition module 7 is used to collect the current and position data of the detection system body 1, and the data acquisition module 7 is installed on the detection system body 1; the central processing unit 8 is electrically connected to the current detector 5, the positioning detector 6, and the data acquisition module 7, and the central processing unit 8 is connected to the first drive mechanism 2 and the second drive mechanism 3. The central processing unit 8 is used to receive the information collected by the data acquisition module 7 and issue instructions to the first drive mechanism 2 and the second drive mechanism 3; the communication module 9 is electrically connected to the data acquisition module 7, and is used to receive the data collected by the data acquisition module 7, and transmit the collected information back to the background terminal in real time. The communication module 9 is connected to the detection system body 1.

[0042] When the system starts working, the positioning detector 6 first detects the position of the detection system body 1, and then the positioning detector 6 transmits the signal to the data acquisition module 7, the data acquisition module 7 transmits it to the central processing unit 8, the central processing unit 8 makes a judgment, and issues instructions to the first drive mechanism 2 and the second drive mechanism 3, the first drive mechanism 2 and the second drive mechanism 3 start to move, and drive the detection mechanism 4 to specifically locate the position of the detection system body 1, the current detector 5 detects the detection system body 1, and then the current detector 5 transmits the detection result to the data acquisition module 7, the data acquisition module 7 transmits it to the communication module 9, and the communication module 9 uploads it to the background terminal.

[0043] In some embodiments, please refer to the attached instructions. Figure 1-6 As a preferred embodiment of the utility model, the detection system body 1 includes a shell 11, a battery pack storage compartment 12, a battery pack 13 and a welding point 14; the shell 11 is slidably connected to the battery pack storage compartment 12, the battery pack 13 is arranged in the battery pack storage compartment 12, the battery pack 13 is fixedly connected to the welding point 14, the shell 11 is connected to the first driving mechanism 2 and the second driving mechanism 3, and the welding point 14 is connected to the detection mechanism 4.

[0044] The first driving mechanism 2 includes a first motor 21, a rotating rod 22, a mounting sleeve 23, a rotating shaft 24, a connecting rod 25, a main bevel gear 26 and a slave bevel gear 27. The mounting sleeve 23, the rotating shaft 24, the connecting rod 25, the main bevel gear 26 and the slave bevel gear 27 are each provided with two groups, which are respectively located at the left and right ends of the rotating rod 22. The first motor 21 is fixedly mounted on the housing 11, and the output end of the first motor 21 is fixedly connected to the rotating rod 22. A convex strip is fixedly mounted on the rotating rod 22, and a groove is provided on the mounting sleeve 23 for sliding connection with the convex strip. The mounting sleeve 23 is fixedly connected to the main bevel gear 26, the inner end of the rotating shaft 24 is rotatably connected to the mounting sleeve 23, and the outer end of the rotating shaft 24 is rotatably connected to the connecting rod 25. The connecting rod 25 on the left is connected to the second driving mechanism 3 and the detection mechanism 4 on the left, the main bevel gear 26 is meshedly connected to the slave bevel gear 27, and the slave bevel gear 27 on the left is connected to the detection mechanism 4 on the left.

[0045] The first motor 21 receives the instruction from the central processor 8 and starts to drive the rotating rod 22 to move, the rotating rod 22 drives the mounting sleeve 23 to move, the mounting sleeve 23 drives the main bevel gear 26 to move, and the main bevel gear 26 drives the slave bevel gear 27 to move.

[0046] The second driving mechanism 3 includes a second motor 31, a bidirectional threaded rod 32, a moving block 33, a cross bar 34 and a slider 35. The moving block 33 is provided with two groups, which are respectively located on the left and right sides of the bidirectional threaded rod 32 and are threadedly connected to the bidirectional threaded rod 32. The moving blocks 33 on the left and right sides move in opposite directions. The slider 35 is provided with two groups, which are respectively located on the left and right sides of the cross bar 34 and are slidably connected to the cross bar 34. The second motor 31 is fixedly installed on the outer wall of the shell 11, and the output end of the second motor 31 is fixedly connected to the bidirectional threaded rod 32. The moving block 33 on the left is fixedly connected to the connecting rod 25 on the left, and the cross bar 34 is fixedly installed on the inner wall of the shell 11. The slider 35 on the left is connected to the detection mechanism 4 on the left.

[0047] The second motor 31 receives the instruction from the central processor 8, and the second motor 31 drives the bidirectional threaded rod 32 to move. The bidirectional threaded rod 32 drives the two groups of moving blocks 33 to move in opposite directions. The two groups of moving blocks 33 drive the two groups of connecting rods 25 to move together, thereby adjusting the distance in the middle.

[0048] The detection mechanism 4 includes an installation box 41, a threaded rod 42, a fixed rod 43, a mounting block 44, a first connecting rod 45, a second connecting rod 46, a protrusion 47 and a spring contact 48. The installation box 41 is rotatably connected to the threaded rod 42. The installation box 41, the threaded rod 42, the fixed rod 43, the mounting block 44, the first connecting rod 45, the second connecting rod 46, the protrusion 47 and the spring contact 48 are all provided in two groups and are located on the left and right sides of the housing 11. The threaded rod 42 on the left is fixedly connected to the left slave bevel gear 27, the installation box 41 on the left is fixedly connected to the left connecting rod 25, five installation blocks 44 are provided and are arranged in the installation box 41 at equal intervals, and the threaded rod 42 is screwed to the frontmost installation block 44. The threaded rod 42 is connected in a sliding manner with the remaining mounting blocks 44. The threaded rod 42 on the left is rotatably connected to the left connecting rod 25. The threaded rod 42 on the left is rotatably connected to the left slider 35. Each group of fixed rods 43 is provided with two fixedly installed in the mounting box 41 and slidably connected to the mounting block 44. The first connecting rod 45 is fixedly connected to the rear end of the mounting box 41. The second connecting rod 46 is provided with multiple blocks and is hinged. The first connecting rod 45 and the second connecting rod 46 are rotatably connected. The second connecting rod 46 is rotatably connected to the mounting block 44. The mounting block 44 is fixedly connected to multiple protrusions 47. Multiple spring contacts 48 are respectively fixedly installed on the protrusions 47. Multiple spring contacts 48 are contacted and connected with multiple welding points 14.

[0049] The connecting rod 25 drives the installation box 41 to start moving, and the rotation of the bevel gear 27 drives the threaded rod 42 to move together. The threaded rod 42 drives the installation block 44 to move, thereby adjusting the distance between the installation blocks 44. The first connecting rod 45 and the second connecting rod 46 limit the installation block 44 to make regular movement, so that the spring contact 48 positions the welding point 14.

[0050] In some embodiments, please refer to the attached instructions. Figure 1-6 As a preferred embodiment of the present utility model, the current detector 5 is fixedly mounted on each spring contact 48 , and the current detector 5 is in contact with the welding point 14 .

[0051] The positioning detector 6 is fixedly mounted on each spring contact 48 .

[0052] The data acquisition module 7 is fixedly mounted on the outer wall of the installation box 41 , and the data acquisition module 7 is electrically connected to the first motor 21 and the second motor 31 .

[0053] The central processing unit 8 is fixedly mounted on the first motor 21 , and the central processing unit 8 is electrically connected to the first motor 21 and the second motor 31 .

[0054] The communication module 9 is fixedly mounted on the outer wall of the housing 11 .

[0055] When the system starts working, the positioning detector 6 first detects the position of the welding point 14, and then the positioning detector 6 transmits the signal to the data acquisition module 7, the data acquisition module 7 transmits it to the central processing unit 8, the central processing unit 8 makes a judgment, and issues instructions to the first motor 21 and the second motor 31, the first motor 21 and the second motor 31 start to move, and drive the spring contact 48 to specifically locate the position of the welding point 14, the current detector 5 detects the welding point 14, and then the current detector 5 transmits the detection result to the data acquisition module 7, the data acquisition module 7 transmits it to the communication module 9, and the communication module 9 uploads it to the background terminal.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding point detection system for a battery pack for a brushless motor, comprising a detection system body (1), characterized in that: It also includes the following components: a first driving mechanism (2), a second driving mechanism (3), a detection mechanism (4), a current detector (5), a positioning detector (6), a data acquisition module (7), a central processing unit (8) and a communication module (9); The first driving mechanism (2) is installed on the detection system body (1); The second driving mechanism (3) is installed on the detection system body (1), and the second driving mechanism (3) is connected to the first driving mechanism (2); The detection mechanism (4) is installed on the detection system body (1), and the detection mechanism (4) is connected to the second drive mechanism (3) and the first drive mechanism (2); The current detector (5) is installed on the detection mechanism (4); the current detector (5) is used to detect the current, and the current detector (5) is connected to the detection system body (1); The positioning detector (6) is installed on the detection mechanism (4); the positioning detector (6) is used to locate the position of the detection system body (1); The data acquisition module (7) is electrically connected to the current detector (5) and the positioning detector (6); the data acquisition module (7) is used to collect current and position data of the detection system body (1); the data acquisition module (7) is installed on the detection system body (1); The central processing unit (8) is electrically connected to the current detector (5), the positioning detector (6), and the data acquisition module (7); the central processing unit (8) is connected to the first drive mechanism (2) and the second drive mechanism (3); the central processing unit (8) is used to receive information collected by the data acquisition module (7) and issue instructions to the first drive mechanism (2) and the second drive mechanism (3); The communication module (9) is electrically connected to the data acquisition module (7) and is used to receive data collected by the data acquisition module (7) and transmit the collected information back to the background terminal in real time. The communication module (9) is connected to the detection system body (1).

2. The welding point detection system for a brushless motor battery pack according to claim 1, characterized in that: The detection system body (1) comprises a shell (11), a battery pack storage compartment (12), a battery pack (13) and a welding point (14); the shell (11) is slidably connected to the battery pack storage compartment (12), the battery pack (13) is arranged in the battery pack storage compartment (12), the battery pack (13) is fixedly connected to the welding point (14), the shell (11) is connected to the first drive mechanism (2) and the second drive mechanism (3), and the welding point (14) is connected to the detection mechanism (4).

3. The welding point detection system for a brushless motor battery pack according to claim 2, characterized in that: The first driving mechanism (2) comprises a first motor (21), a rotating rod (22), a mounting sleeve (23), a rotating shaft (24), a connecting rod (25), a main bevel gear (26) and a secondary bevel gear (27); the mounting sleeve (23), the rotating shaft (24), the connecting rod (25), the main bevel gear (26) and the secondary bevel gear (27) are arranged in two groups and are respectively located at the left and right ends of the rotating rod (22); the first motor (21) is fixedly mounted on the housing (11); the output end of the first motor (21) is fixedly connected to the rotating rod (22); the rotating rod ( A convex strip is fixedly mounted on the mounting sleeve (22), a groove is provided on the mounting sleeve (23) and is slidably connected with the convex strip, the mounting sleeve (23) is fixedly connected with the main bevel gear (26), the inner end of the rotating shaft (24) is rotatably connected with the mounting sleeve (23), the outer end of the rotating shaft (24) is rotatably connected with the connecting rod (25), the connecting rod (25) on the left side is connected with the second driving mechanism (3) and the detection mechanism (4) on the left side, the main bevel gear (26) is meshedly connected with the slave bevel gear (27), and the slave bevel gear (27) on the left side is connected with the detection mechanism (4) on the left side.

4. The welding point detection system for a brushless motor battery pack according to claim 3, characterized in that: The second driving mechanism (3) comprises a second motor (31), a bidirectional threaded rod (32), a moving block (33), a cross bar (34) and a sliding block (35); the moving block (33) is provided with two groups, which are respectively located on the left and right sides of the bidirectional threaded rod (32) and are threadedly connected to the bidirectional threaded rod (32); the moving blocks (33) on the left and right sides move in opposite directions; the sliding block (35) is provided with two groups, which are respectively located on the left and right sides of the cross bar (34) and are slidably connected to the cross bar (34); the second motor (31) is fixedly mounted on the outer wall of the housing (11); the output end of the second motor (31) is fixedly connected to the bidirectional threaded rod (32); the moving block (33) on the left is fixedly connected to the connecting rod (25) on the left; the cross bar (34) is fixedly mounted on the inner wall of the housing (11); and the sliding block (35) on the left is connected to the detection mechanism (4) on the left.

5. The welding point detection system for a brushless motor battery pack according to claim 4, characterized in that: The detection mechanism (4) comprises an installation box (41), a threaded rod (42), a fixed rod (43), a mounting block (44), a first connecting rod (45), a second connecting rod (46), a protrusion (47) and a spring contact (48); the installation box (41) is rotatably connected to the threaded rod (42); the installation box (41), the threaded rod (42), the fixed rod (43), the mounting block (44), the first connecting rod (45), the second connecting rod (46), the protrusion (47) and the spring contact (48) are arranged in two groups and are located on the left and right sides of the housing (11); the threaded rod (42) on the left side is fixedly connected to the left side secondary bevel gear (27); the installation box (41) on the left side is fixedly connected to the left side connecting rod (25); the threaded rod (42) is fixedly connected to the front end The mounting block (44) is threadedly connected, the left threaded rod (42) is rotatably connected to the left connecting rod (25), the left threaded rod (42) is rotatably connected to the left sliding block (35), each group of fixed rods (43) is provided with two fixedly installed in the mounting box (41) and slidably connected to the mounting block (44), the first connecting rod (45) is fixedly connected to the rear end of the mounting box (41), the second connecting rod (46) is provided with a plurality of pieces and all are hinged, the first connecting rod (45) and the second connecting rod (46) are rotatably connected, the second connecting rod (46) is rotatably connected to the mounting block (44), the mounting block (44) is fixedly connected to the protrusion (47), the spring contact (48) is fixedly installed on the protrusion (47), and the spring contact (48) is contact-connected with the welding point (14).

6. The welding point detection system for a brushless motor battery pack according to claim 5, characterized in that: The current detector (5) is fixedly mounted on each spring contact (48), and the current detector (5) is in contact with the welding point (14).

7. The welding point detection system for a brushless motor battery pack according to claim 6, characterized in that: The positioning detector (6) is fixedly mounted on each spring contact (48).

8. The welding point detection system for a brushless motor battery pack according to claim 7, characterized in that: The data acquisition module (7) is fixedly mounted on the outer wall of the installation box (41), and the data acquisition module (7) is electrically connected to the first motor (21) and the second motor (31).

9. The welding point detection system for a brushless motor battery pack according to claim 8, characterized in that: The central processing unit (8) is fixedly mounted on the first motor (21), and the central processing unit (8) is electrically connected to the first motor (21) and the second motor (31).

10. The welding point detection system for a brushless motor battery pack according to claim 9, characterized in that: The communication module (9) is fixedly mounted on the outer wall of the housing (11).

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