CN217738558U - A kind of battery pack air tightness test tool - Google Patents

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

A battery pack airtight test tool

technical field

The utility model belongs to the technical field of new energy sources, in particular to a battery pack airtight test tool.

Background technique

In the field of battery pack assembly, it is often necessary to test the tightness of the battery pack. Among them, the air tightness test is the most commonly used test method to judge the waterproof and dustproof capabilities of the lithium battery pack.

The principle of the airtightness test is to fill the airtight box with pressure gas, then apply soapy water to the weld to be tested, and judge the airtightness of the airtight chamber or box by observing whether there are bubbles. When this method is applied to the air tightness test of the battery pack, it is necessary to inflate the inside of the battery pack and test the internal pressure. Due to the high pressure of the gas charged, it is necessary to consider and solve the problem of air leakage at the interface. At present, the commonly used The method is to seal the air inlet and air pipe with sealing mud, and then inflate the battery pack, but this process is cumbersome, and each battery pack needs to be plastered and cleaned again, and the sealing effect of this method is not strong, so it cannot be carried out well. Air tightness test; when the battery pack is equipped with an explosion-proof valve, because there are many small holes on the explosion-proof valve, it can maintain air circulation with the outside world. When inflating through the explosion-proof valve, the air leakage is serious, and sealant is usually used Plugging by winding is also time-consuming and labor-intensive, which increases labor intensity and labor costs, and the test efficiency is low, and it cannot withstand high pressure, which affects the test effect.

At present, for the demand of continuous detection, large-scale airtightness detection device and equipment are often used to carry out continuous detection; as CN113267298A discloses a kind of battery pack airtightness detection device, comprises main frame, and this main frame is made of flat dividing plate The upper box and the lower box are separated; the upper box includes an inner compartment and an outer compartment, the outer compartment communicates with the inner compartment, and the top of the outer compartment is provided with a battery pack inlet and outlet; the inner compartment It is equipped with: an airtight box for accommodating battery packs with an open top, an airtight cover for closing the top opening of the airtight box, a lifting drive mechanism for driving the airtight cover to rise and fall vertically, and driving the airtight box in the air A translation drive mechanism for reciprocating translation between directly below the airtight cover and directly below the battery pack inlet and outlet; said airtight cover is externally connected with a pressurized air source and an air tightness detector; CN214309341U discloses a battery pack airtight automatic detection device , including a battery pack, a battery pack vibration platform, a battery pack pressing drive assembly, a detection frame and a lower base, the battery pack pressing drive assembly can limit the battery pack on the battery pack vibration platform; wherein, the The battery pack vibration platform includes a vertical vibration motor, a set of vibration springs, a motor support base and a battery pack inspection platform. However, the above two devices are large in size, complex in structure and composition, and are inconvenient to perform detection anytime and anywhere, and the cost of the equipment is relatively high, which will additionally increase the burden on the enterprise.

It can be seen from the above that in view of the deficiencies of the existing technology, it is necessary to design a new portable tooling suitable for the air tightness test of the battery pack, which can simplify the process, reduce the cost, and at the same time facilitate the operation of the user, greatly improving the Efficiency of battery pack air tightness testing.

Utility model content

In view of the deficiencies in the prior art, the purpose of this utility model is to provide a battery pack airtight test tool, including a limit blocking cavity whose top end is clamped on the explosion-proof valve, a movable fastening part directly in contact with the explosion-proof valve and An inflatable part used for inflation; the top end surface of the limit blocking cavity is provided with a cavity protruding block matched with the explosion-proof valve, which enables the explosion-proof valve to be quickly positioned and fixed on the top of the cavity, and prevents the explosion-proof valve from It comes out from the top of the cavity when it is stressed or inflated; the movable fastening part is provided with a sealing ring, and can press the sealing ring with the explosion-proof valve fixed on the top of the cavity through the pressure exerted by itself, effectively preventing air leakage; The battery pack airtight test tooling of the utility model can realize fast and accurate docking of the battery pack gas charging port and the tooling, and can effectively strengthen the sealing ability of the docking point, effectively improving the air tightness, and the tooling has a simple structure , easy to carry and operate, can greatly improve the efficiency of battery pack air tightness testing.

For this purpose, the utility model adopts the following technical solutions:

In the first aspect, the utility model provides a battery pack airtight test tool, which includes a limiting and blocking cavity whose top end is clamped on the explosion-proof valve of the battery pack, and also includes a A connected movable fastening part and an inflatable part connected to the air inlet of the movable fastening part;

A sealing ring is provided on the top end surface of the movable fastening part, and is in contact with the explosion-proof valve through the sealing ring;

The top end surface of the position-limiting and blocking cavity is provided with cavity protruding blocks at intervals in the circumferential direction, and the cavity protruding blocks are radially provided with a protrusion toward the central axis, which is used to prevent the explosion-proof valve from The top of the limit stop cavity comes out.

The top of the position-limiting and blocking cavity of the utility model is provided with a plurality of spaced cavity protruding blocks that can cooperate with the protruding blocks of the explosion-proof valve; the protruding blocks of the cavity are smaller than or equal to the protruding blocks on the explosion-proof valve Therefore, when the explosion-proof valve aligns the edge gap with the protruding block of the cavity, a part of the explosion-proof valve can enter the cavity smoothly, and then rotate the explosion-proof valve or rotate the tooling so that the The protruding block of the cavity is aligned with the position of the protruding block of the explosion-proof valve. At this time, the explosion-proof valve can be fixed on the top of the cavity and blocked by the protruding block of the cavity, and cannot be separated from the top of the cavity; it should be noted that this utility model The novel preferably arranges the protruding block of the cavity on the top end surface, which is beneficial to the direct processing and forming of the limiting and blocking cavity, and reduces the complexity and cost of the processing technology. Further, the protruding block of the cavity is also It can be arranged on the inner wall surface at the top of the limiting and blocking cavity, and those skilled in the art can make adjustments according to actual conditions.

A part of the movable fastening part of the utility model is located inside the limiting and blocking cavity, and the top of the movable fastening part is in contact with the explosion-proof valve inside the cavity through a sealing ring, further, the The movable fastening part can apply pressure to the explosion-proof valve fixed on the top of the cavity through its own structure. At this time, the explosion-proof valve has been blocked by the raised block of the cavity. Therefore, when the explosion-proof valve is stressed, the sealing ring It can be pressed tightly against the explosion-proof valve, thereby realizing effective sealing of the joint and preventing air leakage.

The following are preferred technical solutions of the utility model, but not as limitations of the technical solutions provided by the utility model.

As a preferred technical solution of the utility model, the movable fastening part includes a receiving pipe, and the receiving pipe includes a receiving plate with an air hole in the center, and a vent pipe connected with the air hole of the receiving plate.

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

The spring is clamped between the receiving plate and the mounting plate;

The fixing 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 fixing block can simultaneously rotate around the central axis of the receiving pipe;

The adjustment block is detachably connected to the bottom end of the receiving pipe, so that the receiving pipe can move forward and backward along the direction of its central axis through the push and pull operation of the adjustment block.

As a preferred technical solution of the utility model, the air inlet of the ventilation pipe serves as the air inlet of the movable fastening part and communicates with the inflatable part.

As a preferred technical solution of the present invention, the edge of the top end face of the receiving plate is provided with an outer wall higher than the top end face;

The top end surface of the receiving plate is provided with a first groove, and a first sealing ring higher than the outer wall is provided on the table formed by the first groove and the outer wall;

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

The first sealing ring described in the utility model can be fixed on the receiving plate through the surrounding outer wall. When its height is higher than the outer wall, it can leave room for subsequent compression, and can effectively wrap the explosion-proof valve to prevent The gas coming out from the pores of the explosion-proof valve leaks out again from the joint, effectively sealing the explosion-proof valve as a whole; The airtightness at the interface of the air outlet of the tooling, the cooperation of the first sealing ring and the second sealing ring can greatly improve the reliability of sealing.

As a preferred technical solution of the present invention, a third groove on the side corresponding to the protruding block of the cavity is provided on the side of the receiving plate.

As a preferred technical solution of the present invention, thread grooves are provided on the side surface of the bottom end of the ventilation pipe along the circumferential direction for fixing the adjustment block.

As a preferred technical solution of the present invention, the side of the adjustment block is provided with a top screw hole corresponding to the threaded groove of the ventilation pipe, which is used for fixing with the receiving pipe, so that the installation plate and the fixing The block is pressed against the adjustment block by the pressure of the spring, and exerts a reverse force on the receiving pipe.

It should be noted that when the battery pack airtight test tool of the present invention is not in use, the spring therein is already in a compressed state, that is, when the adjustment block passes through the top screw hole and the thread groove After fitting and fixing, on the receiving pipe, the distance between the top surface of the mounting plate and the bottom surface of the receiving plate is smaller than the relaxed length of the spring; it should also be noted that the battery pack airtight test tool It also includes a first bolt and a first nut matched with the screw groove and the screw hole.

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

A fixing hole is provided on the surface of the fixing plate around the central axis for fixing with 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 provided on the surface of the mounting plate for fixing with the limiting and blocking cavity;

A matching hole corresponding to the second mounting hole of the mounting plate is provided on the bottom end surface of the position-limiting and blocking cavity.

It should be noted that the battery pack airtight test tool also includes a second bolt and a second nut that cooperate with the fixing hole and the first installation hole; Fitting third bolt and third nut in the mounting holes.

In the utility model, after the spring, the mounting plate and the fixing block are sequentially set on the ventilation pipe, the adjustment block is fixed on the ventilation pipe through the cooperation of the top screw hole and the threaded hole. Above, the fixed block is connected to the mounting plate, but not to the adjusting block; therefore, the adjusting block can drive the receiving pipe to move in the axial direction relative to the mounting plate and the fixing block, thereby The elastic force of the spring is changed; that is, when the explosion-proof valve is fixed on the top of the cavity, because a part of the explosion-proof valve is located inside the cavity, the spring is further compressed, and a force is applied to the receiving pipe toward the explosion-proof valve. pressure, and then realize the compression of the sealing ring; further, in actual operation, by changing the position of the adjustment block on the vent pipe, use the corresponding bolt to pass through the hole of the top screw and push it against the On the air pipe, the adjustment block is fixed to further strengthen the compression of the spring to generate greater elastic force and enhance the sealing performance; connected, but not limitedly fixed on the vent pipe, so the above three can rotate around the central axis to facilitate the positional alignment of the position-limiting blocking cavity and the explosion-proof valve.

The jackscrew hole and threaded hole in the utility model are connected and fixed by detachable bolts and nuts, therefore, quick replacement of the type of spring can be realized, and a suitable spring can be selected so that the force provided by the spring after compression is equivalent to the air pressure when inflated. Matching can enable the tooling to achieve good sealing, and at the same time, the explosion-proof valve and the battery pack will not be damaged due to excessive pressure.

The third groove on the side of the receiving plate of the utility model corresponds to the protruding block of the cavity, so that the receiving plate can pass through the limit blocking cavity without hindrance, which is convenient for passing through after use. Push the adjustment block to push the receiving plate out of the limiting and blocking cavity, so that the explosion-proof valve can be quickly disengaged.

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

(1) The utility model can quickly install the explosion-proof valve on the tooling by setting a limit blocking cavity, realize the rapid positioning and fixing of the explosion-proof valve, and ensure that the charging port of the battery pack is at the same level as the gas outlet of the tooling, Realize fast and accurate docking;

(2) The utility model arranges a sealing ring on the top end face of the movable fastening part, and through the cooperation of the movable fastening part and the limit blocking cavity, the sealing ring is tightly pressed on the explosion-proof valve, which can further strengthen the docking The sealing ability at the joint can prevent the gas from leaking from the pores of the explosion-proof valve, which can effectively prevent the leakage of gas at the joint when the inflation pressure is too high, effectively improve the air tightness of the joint, and then ensure the air tightness test of the battery pack The smooth progress of the test results improves the accuracy of the test results;

(3) The battery pack airtightness test tooling of the utility model has a simple structure, low cost, easy manufacture, portability and operation, can save a lot of manpower and material resources, and greatly improve the efficiency of the battery pack airtightness test.

Description of drawings

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

Fig. 2 is a schematic structural diagram of the movable fastening part described in the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of the bottom end direction of the position-limiting and blocking cavity described in the embodiment of the present invention;

Fig. 4 is a structural schematic diagram of the top direction of the receiving pipe fitting described in the embodiment of the present invention;

Fig. 5 is a structural schematic view of the bottom end direction of the receiving pipe fitting described in the embodiment of the present invention;

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

Figure 7 is a perspective view along the top view direction in Figure 6;

Among them, 1-explosion-proof valve, 101-explosion-proof valve protruding block, 2-limiting blocking cavity, 201-cavity protruding block, 202-protrusion, 203-fitting hole, 3-first sealing ring, 4-the first Two sealing rings, 5-accepting pipe fittings, 510-accepting plate, 511-outer wall, 512-first groove, 513-annular second groove, 514-third side groove, 520-breather pipe, 521-thread groove , 522-air intake of the vent pipe, 6-spring, 7-installation plate, 701-first installation hole, 702-second installation hole, 8-fixing block, 810-fixing plate, 811-fixing hole, 820 fixing Barrel, 9-adjustment block, 901-top wire hole, 10-inflatable part.

Detailed ways

In order to make the technical solution, purpose and advantages of the utility model clearer, the utility model will be further described in detail below through specific implementation examples and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. For electricity and communication, it can be a wired connection or a wireless connection. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Example

This embodiment provides a battery pack airtight test tool, and its structural schematic diagram is shown in Figure 1-7. The battery pack airtight test tool includes a limit barrier cavity whose top is clamped on the explosion-proof valve 1 of the battery pack. The body 2 also includes a movable fastening part connected to the bottom end of the limiting and blocking cavity 2 and an inflatable part 10 connected to the air inlet of the movable fastening part;

The top end surface of the position-limiting and blocking cavity 2 is provided with four cavity protruding blocks 201 at intervals in the circumferential direction, and the cavity protruding blocks 201 are radially provided with a protrusion 202 toward the central axis; Four matching holes 203 are arranged on the bottom end surface of the position blocking cavity 2 in the circumferential direction;

The movable fastening part includes a receiving pipe 5, and the receiving pipe 5 includes a receiving plate 510 with an air hole in the center, and a vent pipe 520 communicating with the air hole of the receiving plate;

The edge of the top end surface of the receiving plate 510 is provided with an outer wall 511 higher than the top end surface, and the top end surface of the receiving plate 510 is provided with a first groove 512, and the first groove 512 is connected to the outer wall 511. A first sealing ring 3 higher than the outer wall 511 is arranged on the formed table; an annular second groove 513 is arranged on the groove surface formed by the first groove 512, and an annular second groove 513 is arranged in the annular second groove 513 There is a second sealing ring 4; four side third grooves 514 corresponding to the cavity protruding block 201 are provided on the side of the receiving plate 510;

The air inlet 522 of the ventilation pipe 520 is in communication with the inflatable part 10; two opposite thread grooves 521 are provided on the side of the bottom end of the ventilation pipe 520 in the circumferential direction;

The movable fastening part also includes a spring 6, a mounting plate 7, a fixing block 8 and an adjusting block 9 which are sleeved on the ventilation pipe 520 in sequence;

The side of the adjustment block 9 is provided with two screw holes 901 corresponding to the screw grooves 521 of the air pipe 520, and the screw grooves 521 and the screw holes 901 are realized through the first bolt and the first nut. Fixing of the adjustment block 9 and the fixed block 8;

The fixed block 8 includes a fixed plate 810 and a fixed cylinder 820 connected to the top end surface of the fixed plate 810; the installed plate 7 and the spring 6 are successively sleeved on the fixed cylinder 820, and then the fixed The cylinder 820 is sleeved on the ventilation pipe 520 on the receiving pipe 5; the surface of the fixing plate 810 is provided with four fixing holes 811 around the central axis;

The 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 holes 811 and the first mounting holes 701 are connected to the first mounting holes 701 through the second bolts. Two nuts realize the fixing of the mounting plate 7 and the fixed block 8; the plate surface of the mounting plate 7 is also provided with four second mounting holes 702, and the second mounting holes 702 are connected with the third bolt and the second mounting hole 702. The three nuts are connected with the matching holes 203 on the space-limiting and blocking cavity 2 to realize the fixing of the mounting plate 7 and the space-limiting and blocking cavity 2, that is, the bottom of the space-limiting and blocking cavity 2 connected to the movable fastening part;

The inflatable part 10 is a trachea joint, which is connected to an external inflation pipeline;

In the above-mentioned battery pack airtight test tool, the position-limiting blocking cavity 2, the mounting plate 7 and the fixing block 8 can simultaneously rotate around the central axis of the receiving pipe 5;

The adjustment block 9 can move the receiving pipe 5 forward and backward along the direction of its central axis through a push-pull operation.

The method for testing the airtightness of the battery pack using the battery pack airtightness test tool described in this embodiment is as follows:

(1) Adjust the limit blocking cavity so that the protruding block of the cavity is aligned with the edge gap on the explosion-proof valve, pull the adjustment block to move the receiving pipe backward, leave a space for the explosion-proof valve inside the cavity, and then install the explosion-proof valve Insert the valve into the limit blocking cavity, rotate the entire battery pack airtight test tool or rotate the limit blocking cavity, align the protruding block of the cavity with the protruding block of the explosion-proof valve, and loosen the adjustment block so that The receiving pipe fitting is pressed against the explosion-proof valve by the pressure of the spring, so that the explosion-proof valve is stuck on the top of the limiting and blocking cavity; inflated to start the test;

(2) After the test is completed, remove the external inflatable equipment or pipeline from the inflatable part, pull the adjustment block to move the receiving pipe backward, rotate the entire battery pack airtight test tool or rotate the limit blocking cavity , align the raised block of the cavity with the edge notch on the explosion-proof valve and realize disengagement, and loosen the adjusting block.

Repeat steps (1) and (2) to detect other battery packs, use the battery pack air tightness test tool of the utility model to complete the air tightness test of different battery packs in a short time, the loading and unloading process is simple and convenient, and The sealing effect is good, and there is no air leakage, which can effectively guarantee the test results of air tightness and greatly improve the test efficiency.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto, and those skilled in the art should understand that any technical personnel belonging to the technical field can use the technology disclosed in the present utility model Within the scope, easily conceivable changes or substitutions all fall within the protection scope and disclosure scope of the present utility model.

Claims (10)

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.

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