An airtight test tool suitable for prepreg type electrical box cover

Abstract

The present invention relates to an airtight test tool suitable for a prepreg type electric box cover, comprising a test base, a battery cell simulation part, an electric box cover to be tested, a side wall sealing test assembly and a flange sealing test assembly. The electric box cover to be tested is buckled on the periphery of the battery cell simulation part and is in contact with the test base. A first connecting through hole is provided on the side wall of the battery cell simulation part, and a second connecting through hole is provided around its bottom flange. The side wall sealing test assembly is pressed against the side wall of the electric box cover to be tested, and the first connecting through hole is sealed by the first airtight test piece thereon. The flange sealing test assembly is pressed against the bottom flange of the electric box cover to be tested, and the second connecting through hole is sealed by the second airtight test piece thereon. In this way, it is convenient to more closely simulate the actual condition of the battery pack during the client test, so that the simulation test results are more valuable for reference and the test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of airtightness testing, and in particular to an airtightness testing tool suitable for a prepreg type electrical box cover. Background Art

[0002] With the continuous development of society, people use cars more and more frequently. Traditional cars are highly polluting, and new energy vehicles are gradually developing faster and faster. The battery pack is the main source of power for new energy vehicles. In order to protect the internal components of the battery pack from short circuit or damage caused by dust, rain, etc., and to prevent the leakage of toxic, strongly acidic or strongly alkaline battery electrolytes, it is necessary to ensure that the sealing index of the battery box cover must reach a certain dustproof and waterproof level. Therefore, it is necessary to perform an airtightness test on the battery pack after the whole pack is assembled. The airtightness of the battery pack directly affects the safety of the car, and has very high requirements for the entire airtightness detection system.

[0003] At present, the tooling used in the known electric box cover airtightness test system is only provided with a receiving groove, and is designed to fully fit the sealing mouth of the battery box, that is, the battery box cover is completely pressed on the test equipment. The above approach has certain limitations, which are specifically manifested as follows: 1) The traditional airtightness test tooling only has the product limiting function, and there is no battery cell simulation part inside, which cannot accurately and fully simulate the condition of the battery pack during the client test, thereby greatly reducing the reference value of the airtightness test results; 2) The space required for inflation in the traditional test tooling is large, which greatly increases the total time of the inflation process, thereby reducing the efficiency of the airtightness test; in addition, it takes longer for the airflow to stabilize, which can easily lead to large deviations in the final test data, or even distortion; 3) The pressure plate used to press against the cover of the electric box to be tested in the traditional airtightness test tooling cannot simulate and reproduce the state of the box body screw locking. In the actual test process, force is applied to the pressure plate to make the cover of the electric box to be tested fit completely with the sealing gasket on the test fixture. In this way, if there are pinholes, cracks, deformations, unevenness and other defects on the installation surface of the cover of the electric box to be tested, the traditional airtight test fixture will press the defects on the sealing gasket during the test process (playing a negative role of temporarily filling the defects), resulting in the inability to accurately detect the leakage of the cover of the electric box to be tested. Therefore, it is urgent for technicians to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an airtight test tool suitable for a prepreg type electrical box cover, which has a simple structural design, is easy to manufacture and implement, has more accurate test results, and has a more efficient test process.

[0005] In order to solve the above technical problems, the present invention relates to an airtight test tool suitable for a prepreg type electric box cover, which includes a test base, a battery cell simulation, a box cover to be tested, a side wall sealing test assembly and a flange sealing test assembly. A test sink for placing and fixing the battery cell simulation extends downward from the upper plane of the test base. The box cover to be tested is buckled on the periphery of the battery cell simulation, and its bottom flange is in contact with the upper plane of the test base. A plurality of first connecting through holes are provided on the right side wall of the box cover to be tested, and a plurality of second connecting through holes are provided around its bottom flange. The side wall sealing test assembly includes a first pressing plate, a first airtight test piece, a support and a first linear motion element. The first airtight test piece is fixed on the left side wall of the first pressing plate, and corresponds to the position of the above-mentioned first connecting through holes one by one. The first pressing plate is placed parallel to the right side wall of the box cover to be tested, and moves in a displacement direction along the left and right directions under the driving force of the first linear motion element. The support is used to support the first linear motion element and is fixedly connected to the test base. The flange sealing test assembly includes a second pressure plate unit, a second airtightness test piece and a driving unit. The driving unit includes a connecting rod mechanism, a bracket and a second linear motion element. The second pressure plate unit is composed of a plurality of second pressure plates that correspond end to end and are arranged around the periphery of the cover of the electrical box to be tested. The second airtightness test piece is fixed on the bottom wall of the second pressure plate and corresponds one by one to the position of the above-mentioned second connecting through holes. The number of driving units is set to be multiple, which are evenly distributed around the periphery of the second pressure plate unit and are fixed to the test base. The bracket is used to support the connecting rod mechanism and the second linear motion element at the same time. The second pressure plate is connected to the connecting rod mechanism, and swings under the action of the driving force of the second linear motion element to achieve the compression or relaxation of the bottom flange of the cover of the electrical box to be tested.

[0006] As a further improvement of the technical solution of the present invention, an annular avoidance groove extends downward from the upper plane of the test base. The annular avoidance groove is arranged around the periphery of the test trough. A series of supporting protrusions are arranged in the annular avoidance groove along its length direction. The supporting protrusions are used to support the bottom flange of the cover of the electrical box to be tested, and correspond to the positions of the second connecting through holes thereon.

[0007] As a further improvement of the technical solution of the present invention, the first air tightness test piece is fixedly connected to the first pressure plate in a detachable manner. The first air tightness test piece is connected by a first plug-in column and a first test terminal. A series of first mounting holes adapted to the first plug-in column are extended to the right from the left side wall of the first pressure plate. The second air tightness test piece is fixedly connected to the second pressure plate in a detachable manner. The second air tightness test piece is connected by a second plug-in column and a second test terminal. A series of second mounting holes adapted to the second plug-in column are extended upward from the bottom wall of the second pressure plate.

[0008] As a further improvement of the technical solution of the present invention, the side wall sealing test assembly also includes an inclination adjustment seat, a hinge shaft and a locking screw. The first linear motion element is directly fixed to the inclination adjustment seat, and the whole is hinged to the support by means of the hinge shaft so as to be freely swingable. A waist-shaped through hole is provided on the side wall of the inclination adjustment seat for the locking screw to pass through. Corresponding to the waist-shaped through hole, a threaded hole is provided on the support for the locking screw to be screwed in.

[0009] As a further improvement of the technical solution of the present invention, the first linear motion element is preferably a double guide rod cylinder.

[0010] As a further improvement of the technical solution of the present invention, the connecting rod mechanism includes a hinge seat, a connecting rod and a swing rod. The hinge seat is detachably fixed in the bracket. The upper and lower ends of the connecting rod are respectively hinged with the swing rod and the hinge seat to form a first hinge point and a second hinge point respectively. The second linear motion element is fixed to the bottom wall of the bracket, and its power output end is also hinged with the swing rod to form a third hinge point.

[0011] As a further improvement of the technical solution of the present invention, the second linear motion element is preferably a single-rod cylinder.

[0012] As a further improvement of the technical solution of the present invention, the airtightness test tooling for the prepreg type electrical box cover also includes an airtightness tester, a controller, a display screen and a three-color alarm light. The airtightness tester is sandwiched between the battery cell simulation part and the electrical box cover to be tested, so as to detect the air pressure change in the inner cavity of the electrical box cover to be tested in real time. The controller is also connected to the airtightness tester, the display screen and the three-color alarm light.

[0013] Compared with the traditional design structure of the airtight test tooling suitable for the prepreg type electrical box cover, in the technical solution disclosed in the present invention, the interior of the electrical box cover to be tested is filled with battery cell simulation parts, so as to more closely and fully simulate the actual condition of the battery pack during the client test, making the final simulation test results more valuable for reference. Furthermore, the presence of the battery cell simulation parts can also effectively reduce the required filling space for the gas in the electrical box cover to be tested. In this way, on the one hand, the inflation time of the airtight test is effectively shortened, thereby improving the test efficiency; on the other hand, the gas flow state filled in the electrical box cover to be tested is more likely to be stable, thereby improving the accuracy of the airtight test results. More importantly, the first airtight test piece and the second airtight test piece are completely aligned with the first connecting through hole and the second connecting through hole opened in the electrical box cover to be tested, that is, it better simulates the actual condition of the battery pack being locked with the battery mounting chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a three-dimensional schematic diagram of a first embodiment of an airtight test tool suitable for a prepreg type electrical box cover in the present invention.

[0016] Figure 2 yes Figure 1 main view.

[0017] Figure 3 yes Figure 1 Top view of the .

[0018] Figure 4 It is a three-dimensional schematic diagram of the first embodiment of the airtight test tooling suitable for the prepreg type electrical box cover in the present invention (the electrical box cover to be tested and the battery cell simulation parts are hidden).

[0019] Figure 5 It is a three-dimensional schematic diagram of a test base in a first embodiment of an airtight test tool suitable for a prepreg type electrical box cover of the present invention.

[0020] Figure 6 It is a three-dimensional schematic diagram of a battery cell simulation part in the first embodiment of the airtight test tooling suitable for a prepreg type electric box cover of the present invention.

[0021] Figure 7 It is a three-dimensional schematic diagram of an electrical box cover to be tested in the first embodiment of the airtight testing tool suitable for a prepreg type electrical box cover of the present invention.

[0022] Figure 8 It is a three-dimensional schematic diagram of a side wall sealing test assembly in a first embodiment of an airtight test tool suitable for a prepreg type electrical box cover of the present invention.

[0023] Fig. 9 It is a three-dimensional schematic diagram of the first pressing plate in the first embodiment of the airtightness testing tool suitable for the prepreg type electrical box cover of the present invention.

[0024] Fig.10 It is a three-dimensional schematic diagram of the first airtightness test piece in the first embodiment of the airtightness test tooling suitable for a prepreg type electrical box cover of the present invention.

[0025] Fig.11It is a three-dimensional schematic diagram of a flange sealing test assembly in a first embodiment of an airtight test tool suitable for a prepreg type electrical box cover of the present invention (only a portion located directly in front of the electrical box cover to be tested is illustrated).

[0026] Fig.12 It is a three-dimensional schematic diagram of the second pressing plate in the first embodiment of the airtightness testing tool suitable for the prepreg type electrical box cover of the present invention.

[0027] Fig.13 It is a three-dimensional schematic diagram of the second airtightness test piece in the first embodiment of the airtightness test tooling suitable for a prepreg type electrical box cover of the present invention.

[0028] Fig.14 It is a three-dimensional schematic diagram of a drive unit in a first embodiment of an airtight test tool suitable for a prepreg type electrical box cover of the present invention.

[0029] Fig.15 It is a three-dimensional schematic diagram of a second embodiment of the airtightness test tooling suitable for a prepreg type electrical box cover in the present invention.

[0030] 1-test base; 11-test trough; 12-annular avoidance groove; 121-supporting protrusion; 2-battery cell simulation; 3-box cover of the electric box to be tested; 31-right side wall; 311-first connecting through hole; 32-bottom flange; 321-second connecting through hole; 4-side wall sealing test assembly; 41-first pressure plate; 411-first mounting hole; 42-first airtightness test piece; 421-first plug-in column; 422-first test terminal; 43-support; 44-first linear motion element; 45-inclination Adjusting seat; 46-hinge shaft; 47-locking screw; 5-flanged sealing test assembly; 51-second pressure plate unit; 511-second pressure plate; 5111-second mounting hole; 52-second airtightness test piece; 521-second plug-in column; 522-second test terminal; 53-driving unit; 531-connecting rod mechanism; 5311-hinge seat; 5312-connecting rod; 5313-swing rod; 532-bracket; 533-second linear motion element; 6-display screen; 7-three-color alarm light; 8-protective cover. DETAILED DESCRIPTION

[0031] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] In order to facilitate those skilled in the art to fully understand the technical solutions disclosed in the present invention, the present invention is further described in detail below in conjunction with specific embodiments. Figure 1 , Figure 2 , Figure 3 The three-dimensional schematic diagram, the front view and the top view of the first embodiment of the airtightness test tooling applicable to the prepreg type electrical box cover of the present invention are respectively shown; Figure 4 It is a three-dimensional schematic diagram of the first embodiment of the airtight test tooling for prepreg type electrical box cover of the present invention (the electrical box cover to be tested and the battery cell simulation are hidden). It can be seen that it is mainly composed of a test base 1, a battery cell simulation 2, an electrical box cover to be tested 3, a side wall sealing test component 4 and a flange sealing test component 5. Among them, a test sink 11 (such as a test sink 11) extends downward from the upper plane of the test base 1. Figure 5 ). Battery cell simulation 2 (as shown in Figure 6 The test box cover 3 is buckled on the periphery of the battery cell simulation part 2, and its bottom flange 32 is in contact with the upper plane of the test base 1. A plurality of first connection through holes 311 are provided on the right side wall 31 of the test box cover 3, and a plurality of second connection through holes 321 are provided around its bottom flange 32 (as shown in FIG. Figure 7 ). The side wall sealing test assembly 4 includes a first pressing plate 41, a first airtightness test piece 42, a support 43 and a first linear motion element 44. The first airtightness test piece 42 is fixed to the left side wall of the first pressing plate 41, and corresponds to the position of the above-mentioned first connecting through hole 311. The first pressing plate 41 is arranged parallel to the right side wall of the electrical box cover 3 to be tested, and moves in the left and right directions under the driving force of the first linear motion element 44. The support 43 is used to support the first linear motion element 44, and is fixedly connected to the test base 1 (as shown in FIG. Figure 2 , 8As shown in ). The flange sealing test assembly 5 includes a second pressure plate unit 51, a second airtightness test piece 52 and a driving unit 53. The driving unit 53 includes a connecting rod mechanism 531, a bracket 532 and a second linear motion element 533. The second pressure plate unit 51 is composed of a plurality of second pressure plates 511 that correspond end to end and are arranged around the periphery of the electrical box cover 3 to be tested (a plurality of second pressure plates 511 are respectively arranged on the front side, rear side, left side and right side of the electrical box cover 3 to be tested, and are arranged directly above the bottom flange 32). The second airtightness test piece 52 is fixed on the bottom wall of the second pressure plate 511, and corresponds one by one to the position of the above-mentioned second connecting through hole 321. The number of driving units 53 is set to be multiple, which are evenly distributed around the periphery of the second pressure plate unit 51 and are fixed to the test base 1. The bracket 532 is used to simultaneously support the above-mentioned connecting rod mechanism 531 and the second linear motion element 533. The second pressing plate 511 is connected to the connecting rod mechanism 531 and swings under the driving force of the second linear motion element 533 to achieve the compression or relaxation of the bottom flange 32 of the box cover 3 to be tested (such as Fig.11 ).

[0033] By adopting the above-mentioned technical scheme, at least the following beneficial effects are produced: 1) The interior of the cover 3 of the electric box to be tested is filled with a battery cell simulation part 2, thereby accurately and fully simulating the actual condition of the battery pack during the client test, so that the final simulation test result has more reference value; 2) The existence of the battery cell simulation part 2 can also effectively reduce the required filling space for the gas in the cover 3 of the electric box to be tested. In this way, on the one hand, the inflation time of the air-tight test is effectively shortened, thereby improving the test efficiency; on the other hand, the flow state of the gas filled in the cover 3 of the electric box to be tested is more likely to be stable, thereby improving the accuracy of the air-tight test result; 3) The first air-tightness test piece 42 and the second air-tightness test piece 52 are completely aligned with the first connecting through hole 311 and the second connecting through hole 321 opened in the cover 3 of the electric box to be tested, that is, it better simulates the actual condition of the battery pack being locked with the battery mounting chassis.

[0034] It is known that the double-guide rod cylinder has the advantages of high guiding precision and the ability to withstand large lateral loads and torques. It is usually used in the fields of high-precision withdrawal, lifting and limiting. In view of this, the first linear motion element 44 is preferably a double-guide rod cylinder (such as Figure 8 ), thereby ensuring that the first pressing plate 41 has a high displacement operation accuracy and ensuring that the first airtightness test piece 42 thereon is positively pressed against the side wall to be tested of the cover 3 of the electrical box to be tested.

[0035] In addition, in order to reduce the purchase cost and facilitate the later maintenance, the second linear motion element 533 is preferably a single-rod cylinder (such as Fig.14 ).

[0036] As a further optimization of the airtight test fixture structure suitable for the prepreg type electrical box cover, an annular avoidance groove 12 can be extended downward from the upper plane of the test base 1. The annular avoidance groove 12 is arranged around the periphery of the test sink 11. Along the length direction thereof, a series of abutment protrusions 121 (such as Figure 5 ). The supporting protrusion 121 is used to support the bottom flange 32 of the cover 3 of the electric box to be tested, and corresponds to the position of the second connecting through hole 321 thereon. In the actual test process, the cover 3 of the electric box to be tested is pressed between the supporting protrusion 121 and the second pressing plate 511, and the second airtightness test piece 52 is positioned relative to the supporting protrusion 121, thereby ensuring that the fixing state of the cover 3 of the electric box to be tested is completely close to reality, more closely and fully simulating the actual condition of the battery pack during the client test, so that the final simulation test result has more reference value.

[0037] It is known that the first air tightness test piece 42 and the second air tightness test piece 52 will inevitably wear out after being used for a period of time, thereby affecting the accuracy of pressing against the cover 3 of the electrical box to be tested. In view of this, the first air tightness test piece 42 is preferably detachably connected to the first pressure plate 41. The specific implementation scheme is recommended as follows: The first air tightness test piece 42 is connected by a first plug-in column 421 and a first test terminal 422 (such as Fig.10 A series of first mounting holes 411 (as shown in FIG. 1 ) adapted to the first plug-in posts 421 extend rightward from the left side wall of the first pressing plate 41. Fig. 9 The second airtightness test piece 52 is preferably detachably connected to the second pressure plate 511. The specific implementation scheme is recommended as follows: The second airtightness test piece 521 is formed by connecting the second plug-in column 521 and the second test terminal 522 (as shown in Fig.13 A series of second mounting holes 5111 (as shown in FIG. 1 ) adapted to the second plug-in posts 521 extend upward from the bottom wall of the second pressing plate 511. Fig.12 ).

[0038] As can be seen from the above description, in the actual test process, it is necessary to ensure that the first pressure plate 41 is always kept parallel to the right side wall 31 of the cover 3 of the electrical box to be tested, otherwise the first airtightness test piece 42 will be biased against the cover 3 of the electrical box to be tested, thereby damaging or tearing the cover 3 of the electrical box to be tested. In view of this, the side wall sealing test assembly 4 is also provided with an inclination adjustment seat 45, a hinge shaft 46 and a locking screw 47. The first linear motion element 44 is directly fixed to the inclination adjustment seat 45, and the whole is hinged to the support 43 so that it can swing freely by means of the hinge shaft 46. A waist-shaped through hole is provided on the side wall of the inclination adjustment seat 45 for the locking screw 47 to pass through. Corresponding to the waist-shaped through hole, a threaded hole (such as Figure 8 As shown in ). In this way, on the one hand, it is effectively ensured that the first airtightness test piece 42 is always kept in a positive leaning state relative to the cover 3 of the electric box to be tested, so that it can more closely simulate the actual condition of the cover 3 of the electric box to be tested when it is tested on the client; on the other hand, when the model of the cover 3 of the electric box to be tested is changed, or the angle of the side wall to be tested of the cover 3 of the electric box to be tested is changed, it is only necessary to loosen the locking screw 47 and then rotate the inclination adjustment seat 45. At the same time, the locking screw 47 slides along the waist-shaped through hole until the first airtightness test piece 42 is in a vertical leaning state relative to the side wall to be tested of the cover 3 of the electric box to be tested, and then tighten the locking screw 47, thereby reducing the difficulty of modifying the airtightness test tooling and indirectly expanding its scope of application.

[0039] As a further refinement of the structure of the flange sealing test assembly 5, the connecting rod mechanism 531 is mainly composed of a hinge seat 5311, a connecting rod 5312 and a swing rod 5313. Among them, the hinge seat 5311 is detachably fixed in the bracket 532 by means of bolts. The upper and lower ends of the connecting rod 5312 are respectively hinged to the swing rod 5313 and the hinge seat 5311 to form a first hinge point and a second hinge point correspondingly. The single-rod cylinder is fixed to the bottom wall of the bracket 532, and its piston rod is also hinged to the swing rod 5313 to form a third hinge point (such as Fig.14 ). And the force amplification factor increases with the increase of the distance between the first hinge point and the third hinge point. By adopting the above technical solution, the requirement for the output force of the single-rod cylinder can be effectively reduced, making it possible to select a single-rod cylinder with a smaller volume, thereby facilitating the miniaturization of the flange sealing test assembly 5 and facilitating the subsequent space layout.

[0040] Furthermore, if Figure 1As shown in the figure, the airtightness test tool suitable for the prepreg type electrical box cover is additionally provided with an airtightness tester (not shown in the figure), a controller (not shown in the figure), a display screen 6 and a three-color alarm light 7. The airtightness tester is clamped between the battery cell simulation part 2 and the electrical box cover 3 to be tested. The controller is connected to the airtightness tester, the display screen 6 and the three-color alarm light 7 at the same time. The airtightness tester is used to detect the air pressure changes in the inner cavity of the electrical box cover 3 to be tested in real time, that is, to indirectly obtain the gas leakage of the electrical box cover 3 to be tested. The display screen 6 is used to illustrate the air pressure change curve or the gas leakage curve in real time. When the gas leakage is less than the set value, the green light of the three-color alarm light is always on; when the gas leakage is greater than the set value, the red light of the three-color alarm light is always on, and the control panel immediately emits an alarm sound.

[0041] Fig.15 A three-dimensional schematic diagram of a second embodiment of the airtight test tooling suitable for a prepreg type electrical box cover in the present invention is shown. The difference between the second embodiment and the first embodiment mentioned above is that a protective cover shell 8 is fixed around the periphery of the test base 1, thereby achieving reliable protection for the test sealing test assembly 4 and the flange sealing test assembly, ensuring the personal safety of the operator.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An airtightness test tool suitable for a prepreg type electrical box cover, characterized in that: It comprises a test base, a battery cell simulation part, a cover of an electric box to be tested, a side wall sealing test assembly and a flange sealing test assembly; a test trough for placing and fixing the battery cell simulation part extends downward from the upper plane of the test base; the cover of the electric box to be tested is buckled on the periphery of the battery cell simulation part, and its bottom flange is in contact with the upper plane of the test base; a plurality of first connecting through holes are provided on the right side wall of the cover of the electric box to be tested, and a plurality of second connecting through holes are provided around its bottom flange; the side wall sealing test assembly comprises a first pressing plate, a first airtightness test piece, a support and a first linear motion element; the first airtightness test piece is fixed on the left side wall of the first pressing plate, and corresponds to the position of the first connecting through holes one by one; the first pressing plate is arranged parallel to the right side wall of the cover of the electric box to be tested, and moves in displacement along the left and right directions under the driving force of the first linear motion element; The support is used to support the first linear motion element and is fixedly connected to the test base; the flange sealing test assembly includes a second pressure plate unit, a second airtightness test piece and a driving unit; the driving unit includes a connecting rod mechanism, a bracket and a second linear motion element; the second pressure plate unit is composed of a plurality of second pressure plates corresponding to each other end to end and arranged around the periphery of the cover of the electrical box to be tested; the second airtightness test piece is fixed on the bottom wall of the second pressure plate and corresponds one by one to the position of the second connecting through hole; the number of the driving units is set to be multiple, which are evenly distributed around the periphery of the second pressure plate unit and are fixed to the test base; the bracket is used to simultaneously support the connecting rod mechanism and the second linear motion element; the second pressure plate is connected to the connecting rod mechanism, and swings under the action of the driving force of the second linear motion element to achieve the compression or relaxation of the bottom flange of the cover of the electrical box to be tested; An annular avoidance groove extends downward from the upper plane of the test base; the annular avoidance groove is arranged around the periphery of the test sink; A series of supporting protrusions are arranged in the annular avoidance groove along its length direction; the supporting protrusions are used to support the bottom flange of the cover of the electrical box to be tested, and correspond to the positions of the second connecting through holes one by one; The first air tightness test piece is fixedly connected to the first pressure plate in a detachable manner; the first air tightness test piece is connected by a first plug-in column and a first test terminal; a series of first mounting holes adapted to the first plug-in column are extended to the right from the left side wall of the first pressure plate; the second air tightness test piece is fixedly connected to the second pressure plate in a detachable manner; the second air tightness test piece is connected by a second plug-in column and a second test terminal; a series of second mounting holes adapted to the second plug-in column are extended upward from the bottom wall of the second pressure plate.

2. The airtightness test tool suitable for the prepreg type electrical box cover according to claim 1 is characterized in that: The side wall sealing test assembly also includes an inclination adjustment seat, a hinge shaft and a locking screw; the first linear motion element is directly fixed to the inclination adjustment seat, and the whole is hinged to the support so that it can swing freely by means of the hinge shaft; a waist-shaped through hole is provided on the side wall of the inclination adjustment seat for the locking screw to pass through; corresponding to the waist-shaped through hole, a threaded hole is provided on the support for the locking screw to be screwed in.

3. The airtightness test tooling for prepreg type electrical box cover according to claim 2 is characterized in that: The first linear motion element is a double-guide-rod cylinder.

4. The airtightness test tooling for prepreg type electrical box cover according to claim 2 is characterized in that: The connecting rod mechanism includes a hinge seat, a connecting rod and a swing rod; the hinge seat is detachably fixed in the bracket; the upper and lower ends of the connecting rod are respectively hinged to the swing rod and the hinge seat to form a first hinge point and a second hinge point correspondingly; the second linear motion element is fixed to the bottom wall of the bracket, and its power output end is also hinged to the swing rod to form a third hinge point.

5. The airtightness test tooling for prepreg type electrical box cover according to claim 4 is characterized in that: The second linear motion element is a single-rod cylinder.

6. The airtightness test tool for prepreg type electrical box cover according to claim 4 is characterized in that: It also includes an air tightness tester, a controller, a display screen and a three-color alarm light; the air tightness tester is clamped between the battery cell simulation component and the cover of the electrical box to be tested, so as to detect the air pressure changes in the inner cavity of the cover of the electrical box to be tested in real time; the controller is simultaneously connected to the air tightness tester, the three-color alarm light and the display screen.

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