CN217738558U

CN217738558U - Battery package airtight test fixture

Info

Publication number: CN217738558U
Application number: CN202221682528.8U
Authority: CN
Inventors: 蒋方威; 李松林; 刘建永
Original assignee: Rept Battero Energy Co Ltd
Current assignee: Rept Battero Energy Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-04
Anticipated expiration: 2032-06-30

Abstract

The utility model provides a battery pack airtightness testing tool, which comprises a limiting blocking cavity with the top end clamped on an explosion-proof valve, a movable fastening part directly contacted with the explosion-proof valve and an inflating part for inflating; the cavity convex block matched with the explosion-proof valve is arranged on the end surface of the top end of the limiting blocking cavity, so that the explosion-proof valve can be quickly positioned and fixed at the top end of the cavity, and the explosion-proof valve can be prevented from being separated from the top end of the cavity when being stressed or inflated; the movable fastening part is provided with a sealing ring, and the sealing ring can be tightly pressed with an explosion-proof valve fixed at the top end of the cavity through the pressure applied by the movable fastening part, so that air leakage is effectively prevented; battery package airtight test fixture can realize the battery package inflation inlet with quick, the accurate butt joint of frock to can effectively strengthen the shutoff ability of butt joint department, the gas tightness of effective improvement, frock simple structure, portable and operation can greatly improve the efficiency of battery package airtight test.

Description

Battery package airtight test fixture

Technical Field

The utility model belongs to the technical field of the new forms of energy, especially, relate to a battery package airtight test fixture.

Background

In the field of battery pack assembly, tightness detection is often required to be performed on a battery pack, wherein the tightness detection is the most commonly used test method for judging the waterproof, dustproof and other capabilities of a lithium battery pack.

The principle of the air tightness test is that pressure gas is filled into the airtight box, then soapy water is smeared at a welding seam to be tested, and whether bubbles are generated or not is observed to judge the air tightness of the airtight cabin or the airtight box. When the method is applied to the air tightness detection of the battery pack, the interior of the battery pack needs to be inflated and the pressure of the interior needs to be tested, and the problem of air leakage of an interface needs to be considered and solved due to the fact that the pressure of the inflated gas is high; when the battery pack is provided with the explosion-proof valve, the explosion-proof valve is provided with the plurality of pores, so that air circulation can be maintained with the outside, air leakage is serious when the explosion-proof valve is used for inflating, generally, sealant is wound for plugging, time and labor are wasted, labor intensity and labor cost are increased, testing efficiency is low, large pressure cannot be borne, and testing effect is influenced.

At present, for the requirement of continuous detection, a large-scale air tightness detection device and equipment are often adopted for continuous detection; for example, CN113267298A discloses a battery pack airtightness detection device, which comprises a main cabinet, wherein the main cabinet is divided into an upper cabinet and a lower cabinet by a flat partition; the upper box body comprises an inner chamber and an outer chamber, the outer chamber is communicated with the inner chamber, and the top of the outer chamber is provided with a battery pack inlet and outlet; the inner bin is provided with an airtight box, an airtight cover, a lifting driving mechanism and a translation driving mechanism, wherein the airtight box is used for accommodating the battery pack and is provided with an open top, the airtight cover is used for sealing the open top of the airtight box, the lifting driving mechanism drives the airtight cover to vertically lift, and the translation driving mechanism drives the airtight box to perform reciprocating translation between the position under the airtight cover and the position under the battery pack inlet and outlet; the airtight cover is externally connected with a pressurized air source and an air tightness detector; CN214309341U discloses an automatic air-tight seal detection device for a battery pack, which comprises a battery pack, a battery pack vibration platform, a battery pack pressing driving assembly, a detection rack and a lower base, wherein the battery pack pressing driving assembly can limit the position of the battery pack on the battery pack vibration platform; the battery pack vibration platform comprises a vertical vibration motor, a group of vibration springs, a motor support seat and a battery pack detection platform. However, the two devices have large volume, complex structure and composition, inconvenient detection anytime and anywhere, high cost of equipment and additional burden on enterprises.

Therefore, aiming at the defects in the prior art, a novel portable tool suitable for the air tightness test of the battery pack is required to be designed, the process can be simplified, the cost is reduced, the operation of a user is facilitated, and the air tightness test efficiency of the battery pack is greatly improved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a battery pack airtightness testing tool, which comprises a limiting blocking cavity with the top end clamped on an explosion-proof valve, a movable fastening part directly contacted with the explosion-proof valve and an inflating part for inflating; the end face of the top end of the limiting blocking cavity is provided with a cavity protruding block matched with the explosion-proof valve, so that the explosion-proof valve can be quickly positioned and fixed at the top end of the cavity, and the explosion-proof valve can be prevented from being separated from the top end of the cavity when stressed or inflated; the movable fastening part is provided with a sealing ring, and the sealing ring can be tightly pressed with an explosion-proof valve fixed at the top end of the cavity body through pressure applied by the movable fastening part, so that air leakage is effectively prevented; battery package air tightness test fixture can realize the battery package inflation inlet with quick, the accurate butt joint of frock to can effectively strengthen the shutoff ability of butt joint department, the gas tightness that effectively improves, frock simple structure, portable and operation can greatly improve the efficiency of battery package air tightness test.

To achieve the purpose, the utility model adopts the following technical proposal:

in a first aspect, the utility model provides a battery pack airtightness testing tool, which comprises a limit blocking cavity with the top end clamped on an explosion-proof valve of a battery pack, a movable fastening part connected with the bottom end of the limit blocking cavity, and an inflating part connected with an air inlet of the movable fastening part;

a sealing ring is arranged on the end face of the top end of the movable fastening part and is in contact with the explosion-proof valve through the sealing ring;

the explosion-proof valve is characterized in that cavity protruding blocks are arranged on the end face of the top end of the limiting blocking cavity at intervals along the circumferential direction, and protrusions facing the central shaft are radially arranged on the cavity protruding blocks and used for preventing the explosion-proof valve from being separated from the top end of the limiting blocking cavity.

The top end of the spacing blocking cavity of the utility model is provided with a plurality of spaced cavity convex blocks which can be matched with the explosion-proof valve convex blocks; the cavity convex blocks are less than or equal to edge gaps formed among the convex blocks on the explosion-proof valve, so that when the edge gaps are aligned to the cavity convex blocks by the explosion-proof valve, one part of the explosion-proof valve can smoothly enter the cavity, and then the explosion-proof valve is rotated or the tool is rotated to enable the cavity convex blocks to be aligned to the positions of the explosion-proof valve convex blocks, and at the moment, the explosion-proof valve can be fixed at the top end of the cavity and blocked by the cavity convex blocks and cannot be separated from the top of the cavity; it should be noted that the utility model discloses it is preferred will the protruding piece of cavity sets up on the top end face, is favorable to spacing direct machine-shaping who blocks the cavity reduces the loaded down with trivial details degree and the cost of processing technology, furtherly, the protruding piece of cavity also can set up spacing on the internal face that blocks cavity top department, technical personnel in the field can adjust according to actual conditions.

Some of activity fastening portion are located spacing inside that blocks the cavity, just the top of activity fastening portion pass through the sealing washer with explosion-proof valve is at cavity internal contact, furtherly, activity fastening portion can exert pressure to the explosion-proof valve that is fixed in the cavity top through the structure of self, because explosion-proof valve has blockked by the protruding piece of cavity this moment, consequently, explosion-proof valve in the atress, the sealing washer can compress tightly in explosion-proof valve, and then the effective shutoff of realization butt joint department prevents gas leakage.

The following is a preferred embodiment of the present invention, but not a limitation of the embodiment provided by the present invention.

As the utility model discloses preferred technical scheme, activity fastening portion is including the socket pipe spare, the socket pipe spare includes that the center opens the board of accepting that has the gas pocket, and with the breather pipe that the gas pocket of accepting the board is linked together.

As a preferred technical solution of the present invention, the movable fastening portion further comprises a spring, a mounting plate, a fixing block, and an adjusting block, which are sequentially sleeved on the vent pipe;

the spring is clamped between the bearing plate and the mounting plate;

the fixed block is detachably connected to the mounting plate, and the mounting plate is detachably connected to the bottom end of the limiting and blocking cavity, so that the limiting and blocking cavity, the mounting plate and the fixed block can simultaneously rotate around the central axis of the bearing pipe fitting;

the adjusting block is detachably connected to the bottom end of the bearing pipe fitting, so that the bearing pipe fitting can move back and forth along the direction of the central axis of the bearing pipe fitting through the push-pull operation of the adjusting block.

As the utility model discloses preferred technical scheme, the air inlet of breather pipe does the air inlet of activity fastening portion and with it is linked together to aerify the piece.

As the preferable technical proposal of the utility model, the edge of the top end surface of the bearing plate is provided with an outer wall higher than the top end surface;

a first groove is formed in the end face of the top end of the bearing plate, and a first sealing ring higher than the outer wall is arranged on a table top formed by the first groove and the outer wall;

an annular second groove is formed in the groove surface formed by the first groove, and a second sealing ring is arranged in the annular second groove.

The first sealing ring can be fixed on the bearing plate through the surrounding outer wall, when the first sealing ring is higher than the outer wall, a space can be reserved for subsequent compression, the explosion-proof valve can be effectively wrapped, gas coming out of the pores of the explosion-proof valve is prevented from leaking from the butt joint part again, and the whole explosion-proof valve is effectively sealed; second sealing washer can further strengthen the inflation inlet on the battery package explosion-proof valve with the gas tightness of the kneck of frock gas outlet, the reliability of shutoff can be improved greatly in the cooperation of first sealing washer and second sealing washer.

As the utility model discloses preferred technical scheme, be provided with on the side of accepting the board with the corresponding side third recess of cavity protruding piece.

As the utility model discloses preferred technical scheme, be provided with the thread groove along circumference on the side of breather pipe bottom, be used for fixing the adjusting block.

As the utility model discloses preferred technical scheme, the side of adjusting block be provided with the jackscrew hole that the thread groove of breather pipe corresponds, be used for with the fixed of bearing pipe fitting, make the mounting panel reaches the fixed block passes through the pressure of spring tightly press in the adjusting block, and give the reverse effort is applyed to the bearing pipe fitting.

It should be noted that, when the battery pack airtightness testing tool of the present invention is not used, the spring therein is already in a compressed state, that is, after the adjusting block is fixed by the matching of the jackscrew hole and the thread groove, on the receiving pipe fitting, the distance between the top surface of the mounting plate and the bottom surface of the receiving plate is smaller than the loose length of the spring; it should be further noted that the battery pack air tightness testing tool further comprises a first bolt and a first nut which are matched with the thread groove and the jackscrew hole.

As a preferred technical solution of the present invention, the fixing block includes a fixing plate and a fixing cylinder connected to a top end face of the fixing plate, the mounting plate and the spring are successively sleeved on the fixing cylinder, and then the fixing cylinder is sleeved on the receiving pipe;

and a fixing hole is formed on the surface of the fixing plate around the central shaft and used for fixing the mounting plate.

As a preferred technical solution of the present invention, a first mounting hole corresponding to the fixing hole of the fixing plate is provided on the surface of the mounting plate for fixing with the fixing block;

a second mounting hole is formed in the plate surface of the mounting plate and used for fixing the limiting blocking cavity;

and the bottom end face of the limiting blocking cavity is provided with a matching hole corresponding to the second mounting hole of the mounting plate.

It should be noted that the battery pack air tightness testing tool further comprises a second bolt and a second nut which are matched with the fixing hole and the first mounting hole; the mounting structure also comprises a third bolt and a third nut which are matched with the matching hole and the second mounting hole.

The utility model is characterized in that after the spring, the mounting plate and the fixed block are sequentially sleeved on the vent pipe, the adjusting block is fixed on the vent pipe through the matching of a jackscrew hole and a threaded hole, and the fixed block is connected with the mounting plate but not connected with the adjusting block; therefore, the adjusting block can drive the bearing pipe piece to move axially relative to the mounting plate and the fixing block, so that the elastic force of the spring is changed; when the explosion-proof valve is fixed at the top end of the cavity, a part of the explosion-proof valve is positioned in the cavity, so that the spring is further compressed, and pressure towards the explosion-proof valve is applied to the pipe receiving piece, and the compression of the sealing ring is further realized; further, in practical operation, the adjusting block can be fixed by changing the position of the adjusting block on the vent pipe, and using a corresponding bolt to penetrate through the jackscrew hole and abut on the vent pipe, so as to further enhance the compression of the spring to generate larger elastic force and enhance the sealing property; in addition, the limiting blocking cavity is connected with the mounting plate and the fixing block but is not restrictively fixed on the vent pipe, so that the limiting blocking cavity, the mounting plate and the fixing block can rotate around a central shaft, and the limiting blocking cavity and the explosion-proof valve can be aligned conveniently.

The jackscrew hole passes through detachable bolt and nut with the screw hole and is connected fixedly, consequently, can realize selecting suitable spring to the quick replacement of spring kind for the atmospheric pressure phase-match when the power that provides after the spring compression and aerify enables when the frock realizes good shutoff, can not cause the damage because of the pressure of applying is too big again, to explosion-proof valve and battery package.

Accept the third recess of the side of board with the protruding piece of cavity is corresponding, makes it can pass through from spacing blocking cavity unimpeded to accept the board, and the convenience can make through promoting the adjusting block after using it follows spacing blocking cavity is interior ejecting, makes explosion-proof valve break away from fast.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) The utility model discloses a set up spacing to block the cavity and can make the explosion-proof valve install in the frock fast, realize the quick location and the fixed of explosion-proof valve, guarantee that the inflation inlet of battery package and the gas outlet of frock are in same water flat line, realize quick accurate butt joint;

(2) The utility model discloses a set up the sealing washer in the top end face of activity fastening portion to through the cooperation of activity fastening portion and spacing block cavity, make the sealing washer sticis on explosion-proof valve, can further strengthen the shutoff ability of butt joint department, prevent that gas from leaking from explosion-proof valve's pore, can effectively prevent because of the inflation pressure when too big, the problem of butt joint department gas leakage, effectively improve the kneck gas tightness, and then guarantee going on smoothly of battery package gas tightness detection, improve the precision of testing result;

(3) Airtight test fixture of battery package simple structure, low cost, easily make and be convenient for carry and operate, can save a large amount of manpower and materials to greatly improve the efficiency of battery package airtightness test.

Drawings

Fig. 1 is a schematic structural view of the explosion-proof valve and the limiting blocking cavity according to the embodiment of the present invention;

fig. 2 is a schematic structural view of the movable fastening portion according to the embodiment of the present invention;

fig. 3 is a schematic structural view of the bottom direction of the spacing blocking cavity according to the embodiment of the present invention;

fig. 4 is a schematic structural view of a top end direction of the receiving pipe fitting according to the embodiment of the present invention;

fig. 5 is a schematic structural view of a bottom end direction of the receiving pipe fitting according to the embodiment of the present invention;

fig. 6 is an effect diagram of the airtight testing tool for battery pack acting on the explosion-proof valve according to the embodiment of the present invention;

FIG. 7 is a perspective view taken from above in FIG. 6;

the anti-explosion valve comprises a 1-anti-explosion valve body, a 101-anti-explosion valve convex block, a 2-limiting blocking cavity, a 201-cavity convex block, a 202-protrusion, a 203-matching hole, a 3-first sealing ring, a 4-second sealing ring, a 5-bearing pipe fitting, a 510-bearing plate, a 511-outer wall, a 512-first groove, a 513-annular second groove, a 514-lateral third groove, a 520-vent pipe, a 521-thread groove, an 522-air inlet of the vent pipe, a 6-spring, a 7-mounting plate, a 701-first mounting hole, a 702-second mounting hole, an 8-fixing block, a 810-fixing plate, a 811-fixing hole, a 820 fixing cylinder, a 9-adjusting block, a 901-jackscrew hole and a 10-inflating part.

Detailed Description

In order to make the technical solution, objects and advantages of the present invention clearer, the present invention is described in further detail below with reference to specific embodiments and accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. For the electrical and communication fields, either a wired connection or a wireless connection is possible. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

The embodiment provides a battery pack air tightness testing tool, the structural schematic diagram of which is shown in fig. 1-7, the battery pack air tightness testing tool comprises a limit blocking cavity 2 with the top end clamped on an explosion-proof valve 1 of a battery pack, a movable fastening part connected with the bottom end of the limit blocking cavity 2 and an inflating part 10 connected with an air inlet of the movable fastening part;

four cavity protruding blocks 201 are arranged on the end face of the top end of the limiting blocking cavity 2 at intervals along the circumferential direction, and protrusions 202 facing the central shaft are arranged on the cavity protruding blocks 201 along the radial direction; four matching holes 203 are formed in the end face of the bottom end of the limiting blocking cavity 2 along the circumferential direction;

the movable fastening part comprises a bearing pipe fitting 5, and the bearing pipe fitting 5 comprises a bearing plate 510 with an air hole in the center and an air pipe 520 communicated with the air hole of the bearing plate;

the edge of the top end face of the bearing plate 510 is provided with an outer wall 511 higher than the top end face, the top end face of the bearing plate 510 is provided with a first groove 512, and a table top formed by the first groove 512 and the outer wall 511 is provided with a first sealing ring 3 higher than the outer wall 511; an annular second groove 513 is formed in the groove surface formed by the first groove 512, and a second sealing ring 4 is arranged in the annular second groove 513; four side surface third grooves 514 corresponding to the cavity raised blocks 201 are arranged on the side surfaces of the bearing plate 510;

the air inlet 522 of the air pipe 520 is communicated with the inflating part 10; two opposite thread grooves 521 are formed in the side surface of the bottom end of the breather pipe 520 along the circumferential direction;

the movable fastening part also comprises a spring 6, a mounting plate 7, a fixed block 8 and an adjusting block 9 which are sequentially sleeved on the vent pipe 520;

two jackscrew holes 901 corresponding to the thread groove 521 of the vent pipe 520 are formed in the side face of the adjusting block 9, and the fixing of the adjusting block 9 and the fixing block 8 is realized through a first bolt and a first nut by the thread groove 521 and the jackscrew holes 901;

the fixing block 8 comprises a fixing plate 810 and a fixing cylinder 820 connected with the top end face of the fixing plate 810; the mounting plate 7 and the spring 6 are sequentially sleeved on the fixed cylinder 820, and then the fixed cylinder 820 is sleeved on the vent pipe 520 on the receiving pipe fitting 5; four fixing holes 811 are formed on the plate surface of the fixing plate 810 around the central shaft;

the plate surface of the mounting plate 7 is provided with four first mounting holes 701 corresponding to the fixing holes 811 of the fixing plate 810, and the fixing of the mounting plate 7 and the fixing block 8 is realized through second bolts and second nuts by the fixing holes 811 and the first mounting holes 701; the surface of the mounting plate 7 is further provided with four second mounting holes 702, the second mounting holes 702 are connected with the matching holes 203 on the limiting blocking cavity 2 through third bolts and third nuts, so that the mounting plate 7 and the limiting blocking cavity 2 are fixed, namely, the bottom end of the limiting blocking cavity 2 is connected to the movable fastening part;

the inflation piece 10 is a gas pipe joint and is connected with an external inflation pipeline;

in the battery pack air tightness test tool, the limiting blocking cavity 2, the mounting plate 7 and the fixing block 8 can simultaneously rotate around the central axis of the bearing pipe fitting 5;

the adjusting block 9 can move the receiving pipe 5 back and forth along the direction of the central axis thereof by pushing and pulling.

The method for testing the air tightness of the battery pack by using the air tightness testing tool of the battery pack in the embodiment comprises the following steps:

(1) Adjusting a limiting blocking cavity to enable a cavity convex block to align with an edge notch on an explosion-proof valve, pulling an adjusting block to enable a receiving pipe piece to move backwards, reserving a space for accommodating the explosion-proof valve in the cavity, then pressing the explosion-proof valve into the limiting blocking cavity, rotating the whole battery pack airtight testing tool or rotating the limiting blocking cavity to enable the cavity convex block to align with the explosion-proof valve convex block, loosening the adjusting block, enabling the receiving pipe piece to be tightly pressed on the explosion-proof valve through the pressure of a spring, and enabling the explosion-proof valve to be clamped at the top end of the limiting blocking cavity; inflating and starting testing;

(2) After the test is finished, the external inflating equipment or the pipeline is detached from the inflating part, the adjusting block is lifted, the pipe receiving part moves backwards, the whole battery pack air tightness test tool is rotated or the limiting blocking cavity is rotated, the protruding block of the cavity is aligned to the edge notch on the explosion-proof valve and is separated, and the adjusting block is released.

Repeat step (1) and (2) and detect in order to other battery packages, use the airtight test fixture of battery package can accomplish the gas tightness test of different battery packages in the short time, and the loading and unloading process is simple and convenient, and the shutoff is effectual, and is airtight, when can effectively guarantee the gas tightness test result, improves efficiency of software testing greatly.

The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all within the protection scope and the disclosure scope of the present invention.

Claims

1. The air tightness test tool for the battery pack is characterized by comprising a limiting blocking cavity (2) with the top end clamped on an explosion-proof valve (1) of the battery pack, a movable fastening part connected with the bottom end of the limiting blocking cavity (2) and an inflating part (10) connected with an air inlet of the movable fastening part;

a sealing ring is arranged on the end face of the top end of the movable fastening part and is in contact with the explosion-proof valve (1) through the sealing ring;

the explosion-proof valve is characterized in that cavity protruding blocks (201) are arranged on the end face of the top end of the limiting blocking cavity (2) at intervals along the circumferential direction, and protrusions (202) facing a central shaft are radially arranged on the cavity protruding blocks (201) and used for preventing the explosion-proof valve (1) from being separated from the top end of the limiting blocking cavity (2).

2. The battery pack airtightness testing tool according to claim 1, wherein the movable fastening portion includes a receiving pipe (5), and the receiving pipe (5) includes a receiving plate (510) having an air hole at its center, and an air pipe (520) communicating with the air hole of the receiving plate.

3. The air tightness testing tool for the battery pack according to claim 2, wherein the movable fastening portion further comprises a spring (6), a mounting plate (7), a fixing block (8) and an adjusting block (9) which are sequentially sleeved on the vent pipe (520);

the spring (6) is clamped between the bearing plate (510) and the mounting plate (7);

the fixing block (8) is detachably connected to the mounting plate (7), the mounting plate (7) is detachably connected to the bottom end of the limiting blocking cavity (2), and the limiting blocking cavity (2), the mounting plate (7) and the fixing block (8) can rotate around the central axis of the bearing pipe fitting (5) simultaneously;

the adjusting block (9) is detachably connected to the bottom end of the bearing pipe fitting (5), so that the bearing pipe fitting (5) can move back and forth in the direction of the center shaft of the bearing pipe fitting through the pushing and pulling operation of the adjusting block (9).

4. The air tightness testing tool for the battery pack according to claim 3, wherein an air inlet (522) of the vent pipe (520) is used as an air inlet of the movable fastening part and is communicated with the inflating part (10).

5. The battery pack airtightness testing tool according to any one of claims 2 to 4, wherein an edge of a top end face of the receiving plate (510) is provided with an outer wall (511) higher than the top end face;

a first groove (512) is formed in the end face of the top end of the bearing plate (510), and a first sealing ring (3) higher than the outer wall (511) is arranged on a table top formed by the first groove (512) and the outer wall (511);

an annular second groove (513) is formed in the groove surface formed by the first groove (512), and a second sealing ring (4) is arranged in the annular second groove (513).

6. The battery pack airtightness test tool according to any one of claims 2 to 4, wherein a side surface third groove (514) corresponding to the cavity protruding block (201) is provided on a side surface of the receiving plate (510).

7. The tool for testing the air tightness of the battery pack according to claim 3 or 4, wherein a threaded groove (521) is circumferentially arranged on the side surface of the bottom end of the vent pipe (520) and used for fixing the adjusting block (9).

8. The tool for testing the air tightness of the battery pack according to claim 7, wherein a top thread hole (901) corresponding to a thread groove (521) of the vent pipe (520) is formed in the side face of the adjusting block (9) and used for fixing the adjusting block and the receiving pipe (5), so that the mounting plate (7) and the fixing block (8) are pressed against the adjusting block (9) through the pressure of the spring (6) and apply a reverse acting force to the receiving pipe (5).

9. The air tightness testing tool for the battery pack according to claim 3 or 4, wherein the fixing block (8) comprises a fixing plate (810) and a fixing barrel (820) connected with the end face of the top end of the fixing plate (810); the mounting plate (7) and the spring (6) are sequentially sleeved on the fixed cylinder (820), and then the fixed cylinder (820) is sleeved on the receiving pipe fitting (5);

and a fixing hole (811) is arranged on the surface of the fixing plate (810) around the central shaft and is used for fixing the mounting plate (7).

10. The battery pack airtightness testing tool according to claim 9, wherein a first mounting hole (701) corresponding to the fixing hole (811) of the fixing plate (810) is provided on the plate surface of the mounting plate (7) for fixing with the fixing block (8);

a second mounting hole (702) is formed in the surface of the mounting plate (7) and used for fixing the limiting blocking cavity (2);

and the bottom end face of the limiting blocking cavity (2) is provided with a matching hole (203) corresponding to the second mounting hole (702) of the mounting plate.