An automatic positioning device for battery pack air tightness test

Abstract

The present invention provides an automatic positioning device for air tightness test of a battery pack, comprising: a main frame; a first-level floating mechanism, comprising a first lifting device, a first support frame, a floating support, a floating positioning part, a floating positioning matching part, a floating fixing part and an initial positioning part; the first lifting device is fixedly connected to the main frame, and the output end is connected to the first support frame; the floating support is movably connected to the first support frame; the floating positioning part and the floating positioning matching part are positioned and matched, and are separately arranged on the first support frame and the floating support; the initial positioning part is connected to the floating support; a second-level floating joint mechanism, comprising an airtight floating assembly and a joint assembly; the airtight floating assembly is connected to the floating support; the joint assembly is connected to the airtight floating assembly. It can realize full-automatic testing, automatic positioning, safety, reliability, high efficiency, reduce labor costs, and improve benefits.

Description

[Technical field]

[0001] The invention relates to the field of battery pack air tightness testing, and in particular to an automatic positioning device for battery pack air tightness testing. [Background technology]

[0002] The invention patent number is 202021782717.3, the application number is 2020.08.24, and the publication number is CN213796050U. It specifically discloses a battery pack air tightness test fixture, which presses the battery explosion-proof valve through the socket, clamps the battery pack explosion-proof valve with the clamping sleeve, and then uses the air holes set on the socket to inflate the installation groove for air tightness test. The power part is used as the actuator to replace the spring to ensure the stability and durability of the clamp, thereby ensuring the reliability of the air tightness test.

[0003] However, the patent adopts handheld operation. On the one hand, manual testing is inefficient and poses safety risks, causing battery damage or personal safety accidents. On the other hand, the patent is not suitable for the increasingly automated production lines required by today's society. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to provide an automatic positioning device for battery pack air tightness testing, which has automated operation and high safety.

[0005] The present invention is implemented as follows: an automatic positioning device for battery pack air tightness testing, comprising:

[0006] Main frame;

[0007] The primary floating mechanism comprises a first lifting device, a first support frame, a floating support frame, a floating positioning part, a floating positioning matching part, a floating fixing part and an initial positioning part; the first lifting device is fixedly connected to the main frame, and the output end is connected to the first support frame; the floating support frame is movably connected to the first support frame; the floating positioning part and the floating positioning matching part are positioned and matched, and are respectively arranged on the first support frame and the floating support frame; the initial positioning part is connected to the floating support frame;

[0008] The secondary floating joint mechanism comprises an airtight floating assembly and a joint assembly; the airtight floating assembly is connected to the floating bracket; and the joint assembly is connected to the airtight floating assembly.

[0009] Furthermore, it also includes:

[0010] The limiting matching part is provided with a limiting hole and is fixedly connected to the main frame;

[0011] A limiting bracket, fixedly connected to the first supporting frame;

[0012] A limiting member, movably connected to the limiting bracket and detachably inserted into the limiting hole;

[0013] A sensor bracket, fixedly connected to the limit bracket;

[0014] The first detection device is fixedly connected to the sensor bracket and is used to detect whether the limiting member is inserted into the limiting hole.

[0015] Furthermore, it also includes:

[0016] A first guide rail, vertically fixedly connected to the main frame;

[0017] The first sliding block is fixedly connected to the first supporting frame and slidably connected to the first guide rail.

[0018] Furthermore, the floating support comprises:

[0019] There are two bearing supports, each having a groove with a side opening, and the bearing supports are symmetrically fixedly connected to the first support frame, and the side openings of the grooves are arranged facing each other;

[0020] A first ball bearing; wherein each of the grooves is provided with a plurality of the first ball bearings;

[0021] A sliding plate is placed in the two grooves, rests on the first ball bearing, and is clearance-matched with the grooves;

[0022] The transfer support is fixedly connected to the sliding plate.

[0023] Further, the floating positioning part includes a first cylinder and a positioning pin; the first cylinder is fixedly connected to the first support frame, and the piston rod is arranged vertically downward; the positioning pin is vertically fixedly connected to the piston rod of the first cylinder;

[0024] The floating positioning matching part includes a fixing block, and the fixing block is provided with a vertical positioning hole; the first cylinder drives the positioning pin to be inserted into the vertical positioning hole;

[0025] The floating fixing part includes at least two second cylinders, the two second cylinders are fixedly connected to the first support frame, and the piston rod is fixedly connected to the transfer support vertically downward.

[0026] Furthermore, the initial positioning portion includes:

[0027] There are two side panels, which are symmetrically fixedly connected to the transfer support;

[0028] There are two positioning pieces, which are fixedly connected to the side plates in a one-to-one correspondence and are used for positioning and matching with the matching pieces on the battery pack tooling;

[0029] The second detection device has two fixedly connected to the side plate in a one-to-one correspondence and is used to detect the relative position between the positioning member and the matching member;

[0030] There are two in-place detection rods, which are vertically and movably connected to the side panels in a one-to-one correspondence;

[0031] There are two springs, which are sleeved on the in-place detection rod in a one-to-one correspondence, and one end of the springs abuts against the side plate, and the other end abuts against the in-place detection rod;

[0032] There are two third detection devices, which are fixedly connected to the side plates in a one-to-one correspondence and are used to detect whether the in-place detection rod has reached a predetermined position.

[0033] Furthermore, the airtight floating assembly comprises:

[0034] A secondary floating support, connected to the floating support;

[0035] The third cylinder is fixedly connected to the secondary floating support, and the piston rod is arranged horizontally;

[0036] The first movable plate is provided with a push block protruding downwards, and is movably connected to the secondary floating support in the horizontal direction, and is fixedly connected to the piston rod of the third cylinder;

[0037] A fourth cylinder, fixedly connected to the first movable plate, with a piston rod arranged vertically;

[0038] A first floating connecting plate, with a second ball bearing disposed downwardly at the center thereof and fixedly connected to the piston rod of the fourth cylinder;

[0039] The second floating connecting plate has first connecting columns protruding downwards at the midpoints of the front, rear, left and right sides respectively;

[0040] The third floating connecting plate has second connecting columns protruding upward at four corners, third ball bearings are respectively provided downward at the bottom of the four corners and the bottom of the center, and a limit avoidance groove is respectively provided at the midpoint of the front, rear, left and right sides; the limit avoidance groove and the first connecting column are clearance-fitted;

[0041] The joint connecting plate has a rectangular frame on the top; the four inner sides of the rectangular frame are respectively provided with fourth ball bearings; each of the fourth ball bearings forms an accommodating cavity; the accommodating cavity and the push block are clearance-matched;

[0042] in:

[0043] The push block is inserted into the accommodating cavity;

[0044] The second floating connection plate is invertedly inserted on the third floating connection plate;

[0045] The first connecting columns are inserted into the limit avoidance grooves one by one, and then fixedly connected to the joint connecting plate;

[0046] Each of the second connecting columns is also fixedly connected to the first floating connecting plate;

[0047] The second ball bearing is placed on the second floating connecting plate;

[0048] Each of the third ball bearings rests on the joint connecting plate.

[0049] Further, the joint assembly includes a plug joint portion and an inflation joint portion;

[0050] There are at least two airtight floating assemblies, and the total number of the plug joint parts and the inflation joint parts is equal to the number of the airtight floating assemblies;

[0051] The joint parts of the plugging parts correspond one-to-one to the joint connecting plates of the same number of the airtight floating components and are fixedly connected;

[0052] The inflatable joint parts are fixedly connected to the joint connecting plates of the remaining airtight floating components in a one-to-one correspondence.

[0053] Further, the plug joint part includes: a plug mounting plate, an end contour guide block, a plug, a fifth cylinder and a fourth detection device;

[0054] The plug mounting plate is fixedly connected to the corresponding joint connecting plate;

[0055] The fifth cylinder is fixedly connected to the plug mounting plate, and the piston rod is horizontally fixedly connected to the plug; the piston rods of the fifth cylinder and the third cylinder are arranged in the same direction;

[0056] The end profiling guide block is provided with a guide through hole, and the outer end surface is a profiling surface; the inner end surface of the end profiling guide block is fixedly connected to the plug mounting plate, and the plug is inserted into the guide through hole and is clearance-fitted;

[0057] The fourth detection device is fixedly connected to the plug mounting plate and is used to detect whether the outer end surface of the end profiling guide block and the battery pack are positioned in place;

[0058] The inflatable joint part includes: an inflatable mounting plate, an airtight mounting plate, a sixth air cylinder, an airtight inflatable shell, an air pipe joint, a screw joint, a sealing ring, a magnetic part, a nylon sleeve, an airtight fixing seat, an explosion-proof nylon block, a seventh air cylinder, a clamping block and a fifth detection device;

[0059] The inflatable mounting plate is fixedly connected to the corresponding joint connecting plate;

[0060] The sixth cylinder is fixedly connected to the inflation mounting plate, and the piston rod is horizontally fixedly connected to the airtight mounting plate and the airtight inflation shell; the piston rods of the sixth cylinder and the third cylinder are arranged in the same direction;

[0061] The outer side surface of the airtight inflatable shell is provided with a first annular groove, and the right end surface is provided with a second annular groove and a third annular groove; the third annular groove is deeper than the second annular groove; the side surface of the airtight inflatable shell is provided with an air inlet; the bottom surface of the third annular groove is provided with an air outlet; the air outlet is connected to the air inlet;

[0062] The nylon sleeve is sleeved on the first annular groove, and the outer surface of the nylon sleeve protrudes from the outer side surface of the airtight inflatable shell;

[0063] The air pipe joint is airtightly connected to the air inlet;

[0064] There is at least one sealing ring, which is inserted into the second annular groove and protrudes from the right end surface of the airtight inflatable shell;

[0065] The screw joint is fixedly connected to the bottom surface of the third annular groove;

[0066] The magnetic member is fixedly connected to the right end of the screw joint;

[0067] The airtight fixing seat is provided with a through hole in the horizontal direction and a vertical through hole at the right end; the airtight fixing seat is fixedly connected to the airtight mounting plate, and the airtight inflatable shell is inserted into the through hole, and the inner side wall of the through hole presses the nylon sleeve airtightly;

[0068] There are two explosion-proof nylon blocks, each of which is provided with an arc chamfer; the two explosion-proof nylon blocks are symmetrically fixedly connected to the right end surface of the airtight fixing seat, and the minimum diameter between the two arc chamfers is ≥ the diameter of the through hole;

[0069] There are two seventh cylinders and two clamping blocks respectively; the seventh cylinders are symmetrically and fixedly connected to the two ends of the through hole; the clamping blocks are fixedly connected to the piston rods of the seventh cylinders in a one-to-one correspondence and inserted into the through hole, and are in a clearance fit with the through hole;

[0070] The fifth detection device is fixedly connected to the airtight fixing seat and is used to detect whether the explosion-proof nylon block and the battery pack are positioned in place.

[0071] Furthermore, a conversion component is also included, and the conversion component includes:

[0072] A first switching slide plate is movably connected to the floating bracket in a horizontal direction, and its moving direction is perpendicular to the piston rod of the third cylinder;

[0073] The eighth cylinder is fixedly connected to the first switching slide plate, and the piston rod is fixedly connected to the floating bracket; the piston rods of the eighth cylinder and the third cylinder are perpendicular;

[0074] The second switching slide plate is movably connected to the floating bracket in a horizontal direction, and the moving direction is perpendicular to the piston rod of the third cylinder;

[0075] The ninth cylinder is fixedly connected to the second switching slide plate, and the piston rod is fixedly connected to the floating bracket; the piston rods of the ninth cylinder and the third cylinder are perpendicular;

[0076] Among them, there are six airtight floating components; there are three plug joints; there are three inflatable joints;

[0077] One of the airtight floating components is fixedly connected to the floating bracket, is located between the first switching slide plate and the second switching slide plate, and is fixedly connected to an inflatable joint portion;

[0078] The three airtight floating components are fixedly connected to the first switching slide plate at predetermined intervals and are fixedly connected to the plug joints in a one-to-one correspondence;

[0079] The remaining two airtight floating components are fixedly connected to the second switching slide plate at a predetermined interval, and are fixedly connected to the remaining inflatable joint parts in a one-to-one correspondence;

[0080] The airtight floating components are arranged in parallel and in the same direction.

[0081] The advantages of the present invention are: an automatic positioning device for air tightness test of a battery pack, comprising: a main frame; a first-level floating mechanism, comprising a first lifting device, a first support frame, a floating support, a floating positioning part, a floating positioning matching part, a floating fixing part and an initial positioning part; the first lifting device is fixedly connected to the main frame, and the output end is connected to the first support frame; the floating support is movably connected to the first support frame; the floating positioning part and the floating positioning matching part are positioned and matched, and are separately arranged on the first support frame and the floating support; the initial positioning part is connected to the floating support; a second-level floating joint mechanism, comprising an airtight floating assembly and a joint assembly; the airtight floating assembly is connected to the floating support; the joint assembly is connected to the airtight floating assembly. It can realize full-automatic testing, automatic positioning, safety, reliability, high efficiency, reduce labor costs, and improve benefits.

Brief Description of the Drawings

[0082] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0083] Figure 1 The automatic positioning device of the present invention is a three-dimensional Figure 1 .

[0084] Figure 2 The automatic positioning device of the present invention is a three-dimensional Figure 2 .

[0085] Figure 3 It is the three-dimensional main frame of the present invention. Figure 1 .

[0086] Figure 4 It is the three-dimensional main frame of the present invention. Figure 2 .

[0087] Figure 5 It is an assembly diagram of the limit bracket, the limit member, the sensor bracket and the first detection device of the present invention.

[0088] Figure 6 It is an exploded view of the limit bracket, the limit member, the sensor bracket and the first detection device of the present invention.

[0089] Figure 7 It is a three-dimensional diagram of the automatic positioning device of the present invention after the main frame and the first lifting device are hidden.

[0090] Figure 8 This is an exploded view of the automatic positioning device of the present invention after the main frame and the first lifting device are hidden.

[0091] Fig. 9 It is an exploded view of the first support frame and the floating support of the present invention.

[0092] Fig.10 It is an exploded view of the transfer support, the initial positioning part and the mold change component of the present invention.

[0093] Fig.11 It is an assembly diagram of the airtight floating assembly and the plug joint of the present invention.

[0094] Fig.12 It is an assembly diagram of the airtight floating assembly and the inflatable joint portion of the present invention.

[0095] Fig.13 It is an exploded view of the airtight floating assembly and the plug joint of the present invention.

[0096] Fig.14 It is a three-dimensional view of the inflation joint portion of the present invention.

[0097] Fig.15 It is an exploded view of the inflation joint portion of the present invention.

[0098] Fig.16 It is a perspective view of the plug joint portion of the present invention.

[0099] Fig.17 It is an exploded view of the plug joint portion of the present invention.

[0100] Fig.18 It is a perspective view of the airtight inflatable shell of the present invention.

[0101] Fig.19 It is a schematic diagram of a battery pack of model 1 of the present invention.

[0102] Fig. 20 It is a schematic diagram of a battery pack of model 2 of the present invention.

[0103] Fig.21 It is a schematic diagram of the insertion and positioning of the automatic positioning device of the present invention and a battery pack of model one.

[0104] Fig. 22 It is a schematic diagram of the insertion and positioning of the automatic positioning device of the present invention and a battery pack of model 2.

[0105] Description of reference numerals:

[0106] Main frame 1, limiting matching part 11, limiting hole 111, limiting bracket 12, strip guide hole 121, limiting member 13, handle 131, spring plunger 132, spherical groove 133, guide pin 134, sensor bracket 14, first detection device 15, first guide rail 16, first slider 17;

[0107] A first floating mechanism 2, a first lifting device 21, a first support frame 22,

[0108] Floating bracket 23, bearing support 231, groove 2311, first ball bearing 232, sliding plate 233, adapter support 234,

[0109] Floating positioning part 24, first cylinder 241, positioning pin 242,

[0110] Floating positioning matching part 25, fixed block 251, vertical positioning hole 2511,

[0111] Floating fixing part 26, second cylinder 261,

[0112] Initial positioning part 27, side plate 271, positioning member 272, second detection device 273, in-position detection rod 274, spring 275, third detection device 276;

[0113] Secondary floating joint mechanism 3,

[0114] Airtight floating assembly 31, secondary floating support 311, third cylinder 312, first moving plate 313, push block 3131, fourth cylinder 314, first floating connecting plate 315, second ball bearing 3151, second floating connecting plate 316, first connecting column 3161, third floating connecting plate 317, second connecting column 3171, third ball bearing 3172, limit avoidance groove 3173, joint connecting plate 318, rectangular frame 3181, fourth ball bearing 3182, accommodating cavity 3183,

[0115] Joint assembly 32,

[0116] Plug joint 321, plug mounting plate 3211, end contour guide block 3212, guide through hole 32121, outer end surface 32122, inner end surface 32123, plug 3213, fifth cylinder 3214, fourth detection device 3215,

[0117] Inflatable joint part 322, inflatable mounting plate 3221, airtight mounting plate 3222, sixth air cylinder 3223, airtight inflatable shell 3224, first annular groove 32241, second annular groove 32242, third annular groove 32243, air inlet 32244, air outlet 32245, air pipe joint 3225, screw joint 3226, sealing ring 3227, magnetic part 3228, nylon sleeve 3229, airtight fixing seat 32210, through hole 322101, through hole 322102, explosion-proof nylon block 32220, arc chamfer 322201, seventh air cylinder 32230, clamping block 32240, fifth detection device 32250;

[0118] The changeover assembly 4, the first switching slide 41, the eighth cylinder 42, the second switching slide 43, the ninth cylinder 44;

[0119] Model 1 battery pack 100, first explosion-proof valve 101, fast-charge high-voltage interface 102, first rear-drive high-voltage interface 103;

[0120] Model 2 battery pack 200, second explosion-proof valve 201, third explosion-proof valve 202, second rear drive high-voltage interface 203;

[0121] Tooling 300 on the AGV trolley, and side panel locating pin 301. [Specific implementation method]

[0122] In the description of the present invention, it is necessary to understand that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0123] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0124] The overall concept of the present invention is as follows:

[0125] Through the primary floating mechanism 2 and the secondary floating joint mechanism 3, it can be connected to the control system of the production line to achieve automatic positioning, improve efficiency and reduce labor costs; and the floating design can reduce the impact of errors in the manufacturing and assembly processes on positioning, making the positioning accuracy higher.

[0126] See also Figures 1 to 22 shown.

[0127] An automatic positioning device for battery pack air tightness testing, comprising:

[0128] Main frame 1;

[0129] The first-level floating mechanism 2 includes a first lifting device 21, a first support frame 22, a floating support 23, a floating positioning part 24, a floating positioning matching part 25, a floating fixing part 26 and an initial positioning part 27; the first lifting device 21 is fixedly connected to the main frame 1, and the output end is connected to the first support frame 22; the floating support 23 is movably connected to the first support frame 22; the floating positioning part 26 and the floating positioning matching part 25 are positioned and matched, and are respectively arranged on the first support frame 22 and the floating support 23; the initial positioning part 26 is connected to the floating support 23; in a specific embodiment, the first lifting device 21 can adopt an actuator, such as a cylinder.

[0130] The secondary floating joint mechanism 3 comprises an airtight floating component 31 and a joint component 32 ; the airtight floating component 31 is connected to the floating bracket 23 ; the joint component 32 is connected to the airtight floating component 31 .

[0131] Also includes:

[0132] The limiting matching part 11 is provided with a limiting hole 111 and is fixedly connected to the main frame 1;

[0133] A limiting bracket 12, fixedly connected to the first supporting frame 22;

[0134] The limiting member 13 is movably connected to the limiting bracket 12 and can be detachably inserted into the limiting hole 111. In a specific embodiment, the limiting member 13 can be a pin or a shaft. For easy operation, a handle 131 can be provided on the side of the limiting member 13. In order to prevent the limiting member 13 from loosening, a spring plunger 132 can be provided in the limiting bracket 12, and a plurality of spherical grooves 133 can be provided on the surface of the limiting member 13 along the axial direction. When the limiting member 13 is inserted into the limiting hole 111, the steel ball of the spring plunger 132 presses against the spherical groove 133 to press against the limiting member 13. Furthermore, a guide pin 134 can be provided on the side of the limiting member 13, and a strip guide hole 121 is provided on the side of the limiting bracket 12. The guide pin 134 is inserted into the strip guide hole 121 to guide the insertion and removal of the limiting member 13. As in a specific implementation, the upper and lower surfaces of the limit member 13 are provided with spherical grooves 133, and both side surfaces are provided with mounting holes for the guide pin 134 and mounting holes for the handle 131, so as to facilitate assembly without distinguishing the left and right or top and bottom of the limit member 13.

[0135] The sensor bracket 14 is fixedly connected to the limiting bracket 12;

[0136] The first detection device 15 is fixedly connected to the sensor bracket 14 and is used to detect whether the limiting member 13 is inserted into the limiting hole 111 .

[0137] In a specific implementation, when the automatic positioning device needs to be maintained, the limiter 13 can be inserted into the limiter hole 111 to achieve mechanical limit, which plays a role of safety protection and prevents the first lifting device 21 from losing control due to power failure and gas failure during the maintenance process, thereby causing the maintenance personnel to fall and injure. At the same time, the limiter 13 is inserted into the limiter hole 111, which is sensed by the first detection device 15, and a feedback signal is given to the control system, which controls each driving device to stop working to avoid injury.

[0138] Also includes:

[0139] A first guide rail 16, vertically fixedly connected to the main frame 1;

[0140] The first slider 17 is fixedly connected to the first support frame 22 and slidably connected to the first guide rail 16. The first guide rail 16 and the first slider 17 can guide the lifting and lowering of the first support frame 22.

[0141] The floating support 23 comprises:

[0142] There are two bearing supports 231, each of which has a groove 2311 with a side opening, and is symmetrically fixedly connected to the first support frame 22, and the side openings of the groove 2311 are arranged facing each other;

[0143] First ball bearings 232; wherein each of the grooves 2311 is provided with a plurality of the first ball bearings 232;

[0144] The sliding plate 233 is placed in the two grooves 2311 and rests on the first ball bearing 232, and is loosely matched with the groove 2311, so that the sliding plate 233 can roll on the first ball bearing 232 and can be blocked by the groove 2311 at the periphery to avoid falling off, thereby achieving first-level floating, reducing the impact of errors generated during the manufacturing and assembly processes on positioning, and improving positioning accuracy.

[0145] The transfer support 234 is fixedly connected to the sliding plate 233 .

[0146] The floating positioning part 24 includes a first cylinder 241 and a positioning pin 242; the first cylinder 241 is fixedly connected to the first support frame 22, and the piston rod is arranged vertically downward; the positioning pin 242 is vertically fixedly connected to the piston rod of the first cylinder 241;

[0147] The floating positioning matching part 25 includes a fixed block 251, and the fixed block 251 is provided with a vertical positioning hole 2511; the first cylinder 241 drives the positioning pin 242 to be inserted into the vertical positioning hole 2511; in a specific embodiment, there are two of each of the first cylinder 241, the positioning pin 242 and the fixed block 251. The purpose of setting the floating positioning part 24 and the floating positioning matching part 25 is: when the first lifting device 21 drives the first support frame 22 to descend, and the initial positioning part 27 and the battery pack tooling are positioned, it is necessary to limit the floating bracket 23 first to avoid the position of the initial positioning part 27 being offset due to the movement of the floating bracket 23 before the initial positioning, and when the initial positioning part 27 is just positioned with the battery pack tooling, the first cylinder 241 drives the positioning pin 242 to disengage from the vertical positioning hole 2511, loosens the floating bracket 23, and makes the floating bracket 23 movable, adaptively adapts to manufacturing and assembly errors and deviations caused by the battery pack being transported to the predetermined position, and improves the positioning accuracy of the initial positioning. That is, when the first support frame 22 is descending and the initial positioning part 27 has not yet been positioned, the positioning pin 242 needs to be inserted into the vertical positioning hole 2511 for limiting. At other times, it needs to be disengaged to facilitate the movement of the floating bracket 23 and adapt to manufacturing and assembly errors.

[0148] The floating fixing part 26 includes at least two second cylinders 261, the two second cylinders 261 are fixedly connected to the first support frame 22, and the piston rods are vertically downwardly fixedly connected to the transfer support 234. The function of the floating fixing part 26 is: after the initial positioning is completed, the floating support 23 needs to be fixed to prevent movement and affect subsequent positioning. Therefore, the piston rods of the second cylinders 261 extend downward to pull the floating support 23 to press against the first ball bearing 232.

[0149] The initial positioning portion 27 includes:

[0150] There are two side plates 271, which are symmetrically fixedly connected to the transfer support 234;

[0151] There are two positioning members 272, which are fixedly connected to the side plates 271 in a one-to-one correspondence, and are used to position and cooperate with the matching members on the battery pack tooling; in a specific implementation, the positioning members 272 can be holes or pins, which can be selected according to the matching members on the battery pack tooling. Figure 7 In the illustrated embodiment, the positioning member 272 is provided with a hole, which is positioned and matched with a pin on the battery pack tooling.

[0152] The second detection device 273 has two fixed connections to the side plate 271 in a one-to-one manner, and is used to detect the relative position between the positioning member 272 and the matching member; that is, when it is detected that the positioning member 272 and the matching member have just been positioned, as a signal source, the first cylinder 241 drives the positioning pin 242 to disengage from the fixing block 251, so as to facilitate the continuation of the initial positioning.

[0153] There are two in-position detection rods 274, which are vertically and movably connected to the side plates 271 in a one-to-one correspondence;

[0154] There are two springs 275, which are respectively sleeved on the in-place detection rod 274, and one end of the springs 275 abuts against the side plate 271, and the other end abuts against the in-place detection rod 274;

[0155] There are two third detection devices 276, which are fixedly connected to the side plates 271 in a one-to-one correspondence, and are used to detect whether the in-position detection rod 274 has reached a predetermined position, that is, to detect whether the positioning member 272 and the matching member are in position.

[0156] The airtight floating assembly 31 comprises:

[0157] A secondary floating support 311 connected to the floating support 23;

[0158] The third cylinder 312 is fixedly connected to the secondary floating support 311, and the piston rod is arranged horizontally;

[0159] The first movable plate 313 is provided with a push block 3131 protruding downwards, and is movably connected to the secondary floating support 311 in the horizontal direction, and is fixedly connected to the piston rod of the third cylinder 312;

[0160] The fourth cylinder 314 is fixedly connected to the first movable plate 313, and the piston rod is arranged vertically;

[0161] The first floating connecting plate 315 has a second ball bearing 3151 disposed downwardly at the center thereof and fixedly connected to the piston rod of the fourth cylinder 314;

[0162] The second floating connecting plate 316 has first connecting posts 3161 protruding downwards at the midpoints of the front, rear, left and right sides respectively;

[0163] The third floating connecting plate 317 has second connecting columns 3171 protruding upward at four corners, third ball bearings 3172 downward at the bottoms of the four corners and the bottom of the center, and a position limiting avoidance groove 3173 is respectively provided at the midpoints of the front, rear, left and right sides; the position limiting avoidance groove 3173 and the first connecting column 3161 are clearance-matched, so that the first connecting column 3161 can move forward, backward, left and right;

[0164] The joint connecting plate 318 has a rectangular frame 3181 on the top; the four inner sides of the rectangular frame 3181 are respectively provided with fourth ball bearings 3182; each of the fourth ball bearings 3182 forms an accommodating cavity 3183; the accommodating cavity 3183 and the push block 3131 are clearance-matched;

[0165] in:

[0166] The push block 3131 is inserted into the accommodating cavity 3183;

[0167] The second floating connecting plate 316 is inserted upside down on the third floating connecting plate 317; the second floating connecting plate 316 and the joint connecting plate 318 are suspended by the third floating connecting plate 317; the second ball bearing 3151 and the third ball bearing 3172 allow the second floating connecting plate 316 to move in the front, back, left and right directions, thereby driving the joint connecting plate 318 and the joint assembly 32 to move, further adapting to the manufacturing, assembly and battery pack position errors, achieving precise positioning, and improving positioning accuracy.

[0168] The first connecting posts 315 are inserted into the limiting avoidance grooves 3173 one by one, and then fixedly connected to the joint connecting plate 318;

[0169] Each of the second connecting columns 3171 is also fixedly connected to the first floating connecting plate 315;

[0170] The second ball bearing 3151 is placed on the second floating connecting plate 316;

[0171] Each of the third ball bearings 3172 rests on the joint connecting plate 318 .

[0172] The working principle of the airtight floating assembly 31 is as follows: the piston rod of the fourth cylinder 314 extends to adjust the height of the joint assembly 32 to a predetermined position, and then the piston rod of the third cylinder 312 extends to push the first movable plate 313 to move, thereby driving the joint assembly 32 and the battery pack to be plugged into a predetermined position. During the plugging process, the second floating connecting plate 316 can move in the front, back, left and right directions, adapt to errors, and realize automatic centering, thereby achieving the purpose of precise positioning and improving positioning accuracy.

[0173] The connector assembly 32 includes a plug connector portion 321 and an inflation connector portion 322; the plug connector portion 321 is used to plug some pores on the battery pack, and the inflation connector portion 322 is used to inflate the unblocked pores to achieve air tightness testing. In a specific implementation, the number of the inflation connector portion 322 and the plug connector portion 321 can be selected according to the number of pores in the battery pack. On the other hand, the number of pores to be inflated during the test can be selected according to demand, such as one, two, or other numbers.

[0174] There are at least two airtight floating components 31, and the total number of the plug connectors 321 and the inflatable connectors 322 is equal to the number of the airtight floating components 31;

[0175] The plugging head joint part 321 corresponds one-to-one to the joint connecting plate 318 of the airtight floating assembly 1 of the same quantity and is fixedly connected;

[0176] The inflation joint portions 322 are fixedly connected to the remaining joint connection plates 318 of the airtight floating assembly 31 in a one-to-one correspondence.

[0177] The plug joint part 321 includes: a plug mounting plate 3211, an end contour guide block 3212, a plug 3213, a fifth cylinder 3214 and a fourth detection device 3215;

[0178] The plug mounting plate 3211 is fixedly connected to the corresponding joint connecting plate 318;

[0179] The fifth cylinder 3214 is fixedly connected to the plug mounting plate 3211, and the piston rod is horizontally fixedly connected to the plug 3213; the piston rods of the fifth cylinder 3214 and the third cylinder 312 are arranged in the same direction;

[0180] The end profiling guide block 3212 is provided with a guide through hole 32121, and the outer end surface 32122 is a profiling surface; the inner end surface 32123 of the end profiling guide block 3212 is fixedly connected to the plug mounting plate 3211, and the plug 3213 penetrates into the guide through hole 32121 and is clearance-fitted;

[0181] The fourth detection device 3215 is fixedly connected to the plug mounting plate 3211 and is used to detect whether the outer end surface 32122 of the end contour guide block 3212 and the battery pack are positioned in place;

[0182] The working principle of the plugging head joint part 321 is as follows: after the piston rod of the third cylinder 312 is extended into place, the piston rod of the fifth cylinder 3214 is extended, driving the plug 3213 to block the air hole of the battery pack. After the fourth detection device 3215 detects that it is in place, it will feedback a signal before the next operation can be carried out.

[0183] The inflatable joint part 322 includes: an inflatable mounting plate 3221, an airtight mounting plate 3222, a sixth air cylinder 3223, an airtight inflatable shell 3224, an air pipe joint 3225, a screw joint 3226, a sealing ring 3227, a magnetic part 3228, a nylon sleeve 3229, an airtight fixing seat 32210, an explosion-proof nylon block 32220, a seventh air cylinder 32230, a clamping block 32240 and a fifth detection device 32250;

[0184] The inflatable mounting plate 3221 is fixedly connected to the corresponding joint connecting plate 318;

[0185] The sixth cylinder 3223 is fixedly connected to the inflation mounting plate 3221, and the piston rod is horizontally fixedly connected to the airtight mounting plate 3222 and the airtight inflation shell 3224; the piston rods of the sixth cylinder 3223 and the third cylinder 312 are arranged in the same direction;

[0186] The outer side surface of the airtight inflatable shell 3224 is provided with a first annular groove 32241, and the right end surface is provided with a second annular groove 32242 and a third annular groove 32243; the third annular groove 32243 is deeper than the second annular groove 32242; the side surface of the airtight inflatable shell 3224 is provided with an air inlet 32244; the bottom surface of the third annular groove 32243 is provided with an air outlet 32245; the air outlet 32245 is connected to the air inlet 32244;

[0187] The nylon sleeve 3229 is sleeved on the first annular groove 32241, and the outer surface of the nylon sleeve 3229 protrudes from the outer side surface of the airtight inflatable shell 3224;

[0188] The air pipe joint 3225 is airtightly connected to the air inlet 32244; the gas is input from the air pipe joint 3225, enters the air inlet 32244, then comes out from the air outlet 32245, and then enters the inflation hole of the battery pack to inflate the battery pack.

[0189] There is at least one sealing ring 3227, which is stuck in the second annular groove 32242 and protrudes from the right end surface of the airtight inflatable shell 3224; the sealing ring 3227 and the nylon sleeve 3229 both play an airtight role to improve the airtightness during inflation.

[0190] The screw joint 3226 is fixedly connected to the bottom surface of the third annular groove 32243;

[0191] The magnetic part 3228 is fixedly connected to the right end of the screw joint 3226; in a specific implementation, the magnetic part 3228 can be a magnet or magnetic steel and other parts, which are used to suck out the switch of the airtight explosion-proof valve that seals the air hole on the battery pack, so that the explosion-proof valve is in an open state, thereby allowing the battery pack to be inflated.

[0192] The airtight fixing seat 32210 is provided with a through hole 322101 in the horizontal direction, and a vertical through hole 322102 is provided at the right end; the airtight fixing seat 32210 is fixedly connected to the airtight mounting plate 3222, and the airtight inflatable shell 3224 is inserted into the through hole 322101, and the inner side wall of the through hole 322101 airtightly presses the nylon sleeve 3229;

[0193] There are two explosion-proof nylon blocks 32220, and each is provided with an arc chamfer 322201; the two explosion-proof nylon blocks 3220 are symmetrically fixedly connected to the right end face of the airtight fixing seat 32210, and the minimum diameter between the two arc chamfers 322201 is ≥ the diameter of the through hole 322101, which plays a role of avoidance; at the same time, the explosion-proof nylon block 32220 can play a buffering role when positioning and plugging.

[0194] There are two of the seventh cylinder 32230 and the blocking block 32240 respectively; the seventh cylinder 32230 is symmetrically fixedly connected to the two ends of the through hole 322102; the blocking blocks 32240 are fixedly connected to the piston rod of the seventh cylinder 32230 in a one-to-one correspondence, and are inserted into the through hole 322102, and have a clearance fit with the through hole 322102; the blocking blocks 32240 are used for positioning and fitting with the corresponding slots on the battery pack, further fixing the inflation connector part 322 and the battery pack to prevent the two from falling off during inflation.

[0195] The fifth detection device 32250 is fixedly connected to the airtight fixing seat 32210, and is used to detect whether the explosion-proof nylon block 32220 and the battery pack are in place. Only after the fifth detection device 32250 detects that they are in place and feeds back a signal to the control system, can the next step of operation be performed.

[0196] The device also includes a changeover component 4, which can select corresponding plug connectors 321 and gas connectors 322 according to the model of the battery pack to meet the different use requirements of the air hole positions of different models of battery packs, and the number and position of the plug connectors 321 and the gas connectors 322 can be pre-set according to the air hole positions and numbers of different models of battery packs to be tested; as shown in the embodiment of the accompanying drawings, corresponding to the tests of two different models, the changeover component 4 includes:

[0197] The first switching slide plate 41 is movably connected to the floating bracket 23 in a horizontal direction, and the moving direction is perpendicular to the piston rod of the third cylinder 312;

[0198] The eighth cylinder 42 is fixedly connected to the first switching slide 41, and the piston rod is fixedly connected to the floating bracket 23, or vice versa, that is, the eighth cylinder 42 can be fixed to the floating bracket 23, and the piston rod is fixed to the first switching slide 41, and the connection method of the ninth cylinder 44 is similar; the piston rods of the eighth cylinder 42 and the third cylinder 312 are perpendicular;

[0199] The second switching slide plate 43 is movably connected to the floating bracket 23 in a horizontal direction, and the moving direction is perpendicular to the piston rod of the third cylinder 312;

[0200] The ninth cylinder 44 is fixedly connected to the second switching slide plate 43, and the piston rod is fixedly connected to the floating bracket 23; the piston rods of the ninth cylinder 44 and the third cylinder 312 are perpendicular;

[0201] There are six airtight floating components 31, three plug connectors 321, and three inflatable connectors 322.

[0202] One of the airtight floating components 31 is fixedly connected to the floating bracket 23, and is located between the first switching slide 41 and the second switching slide 43, and is fixedly connected to an inflatable joint portion 322;

[0203] The three airtight floating components 31 are fixedly connected to the first switching slide plate 41 at predetermined intervals, and are fixedly connected to the plug connector 321 in a one-to-one correspondence;

[0204] The remaining two airtight floating components 31 are fixedly connected to the second switching slide plate 42 at a predetermined interval, and are fixedly connected to the remaining inflatable joint parts 322 in a one-to-one correspondence;

[0205] The airtight floating components 31 are arranged in parallel and in the same direction.

[0206] Specific transformation principle: Figure 8 As shown, from left to right, the two plug connectors 321 on the far left and the first inflation connector 322 on the far right are a group, corresponding to the test of the battery pack 100 of model 1. The third plug connector 321 on the left and the second and third inflation connectors 322 on the right are a group, corresponding to the test of the battery pack 200 of model 2.

[0207] When the battery pack 100 of model one needs to be tested, the piston rods of the eighth cylinder 42 and the ninth cylinder 44 are both retracted, and the spacing between the plug joint part 321 and the inflation joint part 322 of the battery pack 100 of the test model one matches the spacing of the corresponding plug-in positions of the battery pack 100 of model one; during the test, the piston rods of the third cylinders 312 of the three airtight floating assemblies 31 corresponding to the battery pack 100 of model one are extended, while the piston rods of the third cylinders 312 of the three airtight floating assemblies 31 corresponding to the battery pack 200 of model two are retracted, and the unused plug joint part 321 and the inflation joint part 322 are retracted to play a evasive role and avoid interference; of course, in other embodiments, there may be other ways to set the extension and retraction procedures of the piston rods of the eighth cylinder 42 and the ninth cylinder 44 according to the preset positions.

[0208] like Fig.19 and Fig.21 As shown, the battery pack 100 of model 1 includes a first explosion-proof valve 101, a fast-charge high-voltage interface 102, and a first rear-drive high-voltage interface 103; the specific plugging method is: the first explosion-proof valve 101 is plugged into the first inflation connector 322 on the right, at which time the magnetic member 3228 sucks out the switch of the first explosion-proof valve 101 and is in an open state; the fast-charge high-voltage interface 102 is plugged into the second plug connector 321 on the left and is blocked; the first rear-drive high-voltage interface 103 is plugged into the first plug connector 321 on the left and is blocked;

[0209] When it is necessary to test the battery pack 200 of model two, the piston rods of the eighth cylinder 42 and the ninth cylinder 44 are both extended; during the test, the piston rods of the third cylinders 312 of the three airtight floating assemblies 31 corresponding to the battery pack 200 of model two are extended, while the piston rods of the third cylinders 312 of the three airtight floating assemblies 31 corresponding to the battery pack 100 of model one are retracted, and the unused plug joint part 321 and the inflation joint part 322 are retracted to play a evasive role and avoid interference.

[0210] like Fig. 20 and Fig. 22 As shown, the battery pack 200 of model two includes a second explosion-proof valve 201, a third explosion-proof valve 202 and a second rear-drive high-voltage interface 203; the specific plug-in method is: the second explosion-proof valve 201 and the second inflation connector part 322 on the right are plugged in, at this time, the magnetic part 3228 sucks out the switch of the second explosion-proof valve 201 and is in an open state; the third explosion-proof valve 202 and the third inflation connector part 322 on the right are plugged in, at this time, the magnetic part 3228 sucks out the switch of the third explosion-proof valve 202 and is in an open state; the second rear-drive high-voltage interface 203 and the third plug connector part 321 on the left are plugged in and are blocked.

[0211] Directions:

[0212] The first lifting device 21 is a cylinder.

[0213] Each cylinder and detection device of the present invention is respectively connected to the control system of the production line for communication, such as PLC, to achieve automatic control.

[0214] Set up working procedures.

[0215] The corresponding program is called in advance according to the model of the battery pack, and the PLC controls the operation of the eighth cylinder 42 and the ninth cylinder 44 to adjust the corresponding plug joint 321 and the inflation joint 322 to the predetermined position. A barcode scanning device can also be provided to scan the barcode of the battery pack to identify the model so as to call the corresponding working program, which can be selected according to needs.

[0216] Before testing, the battery pack is transported to a predetermined test position by an AGV (not shown). A tooling plate 300 is pre-set on the AGV, and a side plate positioning pin 301 is set on the tooling plate 300, which is used to stop the AGV at a predetermined position. The side plate positioning pin 301 is inserted into the hole of the positioning member 272 to achieve initial positioning, that is, to unify the position of the AGV. This can be pre-set according to actual needs; of course, in other embodiments, the battery pack can also be transported in other ways.

[0217] During the test, the PLC controls the piston rod of the first lifting device 21 to extend downward, and controls the first cylinder 241 to drive the positioning pin 242 to insert into the vertical positioning hole 2511;

[0218] When the side plate locating pin 301 above the tooling plate 300 on the AGV trolley is just inserted into the hole of the locating member 272 and is detected by the second detection device 273, a feedback signal is given to the PLC, and the PLC controls the first cylinder 241 to drive the locating pin 242 to reset and disengage from the vertical locating hole 2511;

[0219] The piston rod of the first lifting device 21 continues to descend to perform preliminary positioning; when the third detection device 276 detects that the positioning is in place, a feedback signal is given to the PLC; the PLC controls the piston rod of the second cylinder 261 to extend downward, press the sliding plate 233, and complete the initial positioning;

[0220] Next, the PLC controls the piston rod of the fourth cylinder 314 to extend, and adjusts the height of the joint assembly 32 to a predetermined position.

[0221] Then the PLC controls the piston rod of the third cylinder 312 to extend, pushing the first movable plate 313 to move, driving the connector assembly 32 and the battery pack to be plugged into a predetermined position;

[0222] Next, the PLC controls the piston rod of the fifth cylinder 3214 to extend, driving the plug 3213 to plug the air hole of the battery pack. After the fourth detection device 3215 detects that it is in place, it feeds back a signal;

[0223] On the other side, the PLC controls the piston rod of the sixth cylinder 3223 to extend, driving the airtight inflatable shell 3224, the explosion-proof nylon block 32220 and other components to be positioned and docked with the inflation hole of the battery pack. After being detected in place by the fifth detection device 32250, a feedback signal is given to the PLC. The PLC then controls the piston rods of the two seventh cylinders 32230 to extend, driving the two blocks 32240 to move toward each other synchronously and insert into the predetermined positioning grooves on the battery pack. After they are in place, the travel switch of the seventh cylinder 32230 can feedback a signal to the PLC. At this time, the magnetic part 3228 sucks out the switch of the explosion-proof valve of the battery pack, which is in an open state, and the battery pack can be inflated for an airtight test.

[0224] After the test is completed, the PLC controls each cylinder to reset.

[0225] When maintenance is required, the limit piece 13 is inserted into the limit hole 111. After the first detection device 15 detects it, a feedback signal is given to the PLC, and the PLC controls the cylinder to stop working. The PLC can also switch to manual operation mode, and the corresponding control buttons can be preset to manually enter the equipment for maintenance, which can ensure the safety of personnel.

[0226] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An automatic positioning device for battery pack air tightness test, characterized in that: include: Main frame; The primary floating mechanism comprises a first lifting device, a first support frame, a floating support frame, a floating positioning part, a floating positioning matching part, a floating fixing part and an initial positioning part; the first lifting device is fixedly connected to the main frame, and the output end is connected to the first support frame; the floating support frame is movably connected to the first support frame; the floating positioning part and the floating positioning matching part are positioned and matched, and are respectively arranged on the first support frame and the floating support frame; the initial positioning part is connected to the floating support frame; The secondary floating joint mechanism comprises an airtight floating assembly and a joint assembly; the airtight floating assembly is connected to the floating bracket; the joint assembly is connected to the airtight floating assembly; The limiting matching part is provided with a limiting hole and is fixedly connected to the main frame; A limiting bracket, fixedly connected to the first supporting frame; A limiting member, movably connected to the limiting bracket and detachably inserted into the limiting hole; A sensor bracket, fixedly connected to the limit bracket; A first detection device, fixedly connected to the sensor bracket, for detecting whether the limiting member is inserted into the limiting hole; A first guide rail, vertically fixedly connected to the main frame; A first sliding block, fixedly connected to the first supporting frame, and slidably connected to the first guide rail; The floating support comprises: There are two bearing supports, each having a groove with a side opening, and the bearing supports are symmetrically fixedly connected to the first support frame, and the side openings of the grooves of the two bearing supports are arranged facing each other; A first ball bearing; wherein each of the grooves is provided with a plurality of the first ball bearings; A sliding plate is placed in the two grooves, rests on the first ball bearing, and is clearance-matched with the grooves; The transfer support is fixedly connected to the sliding plate.

2. The automatic positioning device for battery pack air tightness test according to claim 1, characterized in that: The floating positioning part includes a first cylinder and a positioning pin; the first cylinder is fixedly connected to the first support frame, and the piston rod is arranged vertically downward; the positioning pin is vertically fixedly connected to the piston rod of the first cylinder; The floating positioning matching part includes a fixing block, and the fixing block is provided with a vertical positioning hole; the first cylinder drives the positioning pin to be inserted into the vertical positioning hole; The floating fixing part includes at least two second cylinders, the two second cylinders are fixedly connected to the first support frame, and the piston rod is fixedly connected to the transfer support vertically downward.

3. The automatic positioning device for battery pack air tightness test according to claim 1, characterized in that: The initial positioning portion comprises: There are two side panels, which are symmetrically fixedly connected to the transfer support; There are two positioning pieces, which are fixedly connected to the side plates in a one-to-one correspondence and are used for positioning and matching with the matching pieces on the battery pack tooling; The second detection device has two fixedly connected to the side plate in a one-to-one correspondence and is used to detect the relative position between the positioning member and the matching member; There are two in-place detection rods, which are vertically and movably connected to the side panels in a one-to-one correspondence; There are two springs, which are sleeved on the in-place detection rod in a one-to-one correspondence, and one end of the springs abuts against the side plate, and the other end abuts against the in-place detection rod; There are two third detection devices, which are fixedly connected to the side plates in a one-to-one correspondence and are used to detect whether the in-place detection rod has reached a predetermined position.

4. The automatic positioning device for battery pack air tightness test according to claim 1, characterized in that: The airtight floating assembly comprises: A secondary floating support, connected to the floating support; The third cylinder is fixedly connected to the secondary floating support, and the piston rod is arranged horizontally; The first movable plate is provided with a push block protruding downwards, and is movably connected to the secondary floating support in the horizontal direction, and is fixedly connected to the piston rod of the third cylinder; A fourth cylinder, fixedly connected to the first movable plate, with a piston rod arranged vertically; A first floating connecting plate, with a second ball bearing disposed downwardly at the center thereof and fixedly connected to the piston rod of the fourth cylinder; The second floating connecting plate has first connecting columns protruding downwards at the midpoints of the front, rear, left and right sides respectively; The third floating connecting plate has second connecting columns protruding upward at four corners, third ball bearings are respectively provided downward at the bottom of the four corners and the bottom of the center, and a limit avoidance groove is respectively provided at the midpoint of the front, rear, left and right sides; the limit avoidance groove and the first connecting column are clearance-fitted; The joint connecting plate has a rectangular frame on the top; the four inner sides of the rectangular frame are respectively provided with fourth ball bearings; each of the fourth ball bearings forms an accommodating cavity; the accommodating cavity and the push block are clearance-matched; in: The push block is inserted into the accommodating cavity; The second floating connection plate is invertedly inserted on the third floating connection plate; The first connecting columns are inserted into the limit avoidance grooves one by one, and then fixedly connected to the joint connecting plate; Each of the second connecting columns is also fixedly connected to the first floating connecting plate; The second ball bearing is placed on the second floating connecting plate; Each of the third ball bearings rests on the joint connecting plate.

5. The automatic positioning device for battery pack air tightness test according to claim 4, characterized in that: The joint assembly includes a plug joint part and an inflation joint part; There are at least two airtight floating assemblies, and the total number of the plug joint parts and the inflatable joint parts is equal to the number of the airtight floating assemblies; The joint parts of the plugging parts correspond one-to-one to the joint connecting plates of the same number of the airtight floating components and are fixedly connected; The inflatable joint parts are fixedly connected to the joint connecting plates of the remaining airtight floating components in a one-to-one correspondence.

6. The automatic positioning device for battery pack air tightness test according to claim 5, characterized in that: The plug joint part includes: a plug mounting plate, an end contour guide block, a plug, a fifth cylinder and a fourth detection device; The plug mounting plate is fixedly connected to the corresponding joint connecting plate; The fifth cylinder is fixedly connected to the plug mounting plate, and the piston rod is horizontally fixedly connected to the plug; the piston rods of the fifth cylinder and the third cylinder are arranged in the same direction; The end profiling guide block is provided with a guide through hole, and the outer end surface is a profiling surface; the inner end surface of the end profiling guide block is fixedly connected to the plug mounting plate, and the plug is inserted into the guide through hole and is clearance-fitted; The fourth detection device is fixedly connected to the plug mounting plate and is used to detect whether the outer end surface of the end profiling guide block and the battery pack are positioned in place; The inflatable joint part includes: an inflatable mounting plate, an airtight mounting plate, a sixth air cylinder, an airtight inflatable shell, an air pipe joint, a screw joint, a sealing ring, a magnetic part, a nylon sleeve, an airtight fixing seat, an explosion-proof nylon block, a seventh air cylinder, a clamping block and a fifth detection device; The inflatable mounting plate is fixedly connected to the corresponding joint connecting plate; The sixth cylinder is fixedly connected to the inflation mounting plate, and the piston rod is horizontally fixedly connected to the airtight mounting plate and the airtight inflation shell; the piston rods of the sixth cylinder and the third cylinder are arranged in the same direction; The outer side surface of the airtight inflatable shell is provided with a first annular groove, and the right end surface is provided with a second annular groove and a third annular groove; the third annular groove is deeper than the second annular groove; the side surface of the airtight inflatable shell is provided with an air inlet; the bottom surface of the third annular groove is provided with an air outlet; the air outlet is connected to the air inlet; The nylon sleeve is sleeved on the first annular groove, and the outer surface of the nylon sleeve protrudes from the outer side surface of the airtight inflatable shell; The air pipe joint is airtightly connected to the air inlet; There is at least one sealing ring, which is inserted into the second annular groove and protrudes from the right end surface of the airtight inflatable shell; The screw joint is fixedly connected to the bottom surface of the third annular groove; The magnetic member is fixedly connected to the right end of the screw joint; The airtight fixing seat is provided with a through hole in the horizontal direction and a vertical through hole at the right end; the airtight fixing seat is fixedly connected to the airtight mounting plate, and the airtight inflatable shell is inserted into the through hole, and the inner side wall of the through hole presses the nylon sleeve airtightly; There are two explosion-proof nylon blocks, each of which is provided with an arc chamfer; the two explosion-proof nylon blocks are symmetrically fixedly connected to the right end surface of the airtight fixing seat, and the minimum diameter between the two arc chamfers is ≥ the diameter of the through hole; There are two seventh cylinders and two clamping blocks respectively; the seventh cylinders are symmetrically and fixedly connected to the two ends of the through hole; the clamping blocks are fixedly connected to the piston rods of the seventh cylinders in a one-to-one correspondence and inserted into the through hole, and are in a clearance fit with the through hole; The fifth detection device is fixedly connected to the airtight fixing seat and is used to detect whether the explosion-proof nylon block and the battery pack are positioned in place.

7. The automatic positioning device for battery pack air tightness test according to claim 5, characterized in that: Also included is a changeover component, the changeover component comprising: A first switching slide plate is movably connected to the floating bracket in a horizontal direction, and its moving direction is perpendicular to the piston rod of the third cylinder; The eighth cylinder is fixedly connected to the first switching slide plate, and the piston rod is fixedly connected to the floating bracket; the piston rods of the eighth cylinder and the third cylinder are perpendicular; The second switching slide plate is movably connected to the floating bracket in a horizontal direction, and the moving direction is perpendicular to the piston rod of the third cylinder; The ninth cylinder is fixedly connected to the second switching slide plate, and the piston rod is fixedly connected to the floating bracket; the piston rods of the ninth cylinder and the third cylinder are perpendicular; Among them, there are six airtight floating components; there are three plug joints; there are three inflatable joints; One of the airtight floating components is fixedly connected to the floating bracket, is located between the first switching slide plate and the second switching slide plate, and is fixedly connected to an inflatable joint portion; The three airtight floating components are fixedly connected to the first switching slide plate at predetermined intervals and are fixedly connected to the plug joints in a one-to-one correspondence; The remaining two airtight floating components are fixedly connected to the second switching slide plate at a predetermined interval, and are fixedly connected to the remaining inflatable joint parts in a one-to-one correspondence; The airtight floating components are arranged in parallel and in the same direction.

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