Air tightness detection device for battery box shell of new energy automobile

Abstract

The invention discloses a new energy automobile battery box shell air tightness detection device, and relates to the technical field of air tightness detection devices.The detection device comprises an operation frame, a new energy automobile battery pack is arranged on one side of the operation frame, and an air tightness leak detector is arranged on the other side of the operation frame; and a ventilation pipeline of the air tightness leak detector is communicated with a waterproof ventilation hole of the new energy automobile battery pack. The new energy automobile battery pack is provided with an adjusting assembly for shortening the voltage stabilization time to improve the detection efficiency. According to the air tightness detection device for the battery box shell of the new energy automobile, the volume of the test cavity is reduced, the temperature recovery time is shortened, the voltage stabilization time is further shortened, and the possibility that the production efficiency is affected due to the fact that the test beat is lengthened is reduced under the condition that the detection precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection devices, and in particular to an air tightness detection device for a battery box shell of a new energy vehicle. Background Art

[0002] The rapid popularization of new energy vehicles has brought about many safety issues, among which battery safety is particularly prominent and has attracted widespread attention from the society. A well-sealed car battery box can prevent water, dust and other substances from entering the battery, avoiding battery performance degradation or short circuit accidents. When there is a problem with the sealing of the car battery box, it will cause serious damage to electrical safety and battery performance.

[0003] In scenarios such as heavy rain or wading, if the sealing of the battery pack does not meet the requirements, the vehicle may not start. During driving, the power may be limited and an abnormal stop may occur. When charging, the charging may be interrupted. More seriously, the high-voltage short circuit of the battery line may cause a fire or explosion, or the low-voltage short circuit may cause smoke or fire. Therefore, testing the sealing performance of the battery box is a key link in the manufacturing process of new energy vehicles.

[0004] The commonly used method for air tightness testing is the bubble method, which is to seal the holes of the test battery box, pump air into it, and put it in water to see if there are bubbles. This method is simple to operate and can directly observe the location and situation of the leakage, but the battery box of new energy vehicles is large and bulky. After the test, the battery box of new energy vehicles needs to be cleaned and dried. Once water seepage occurs, the battery module in the battery box will be damaged, which is costly.

[0005] Therefore, most of the existing methods for testing the air tightness of battery box shells for new energy vehicles use a gas pressurization system. The product and the air tightness tester are connected with a quick connector, and then the gas is filled into the workpiece to be tested. After the air pressure stabilizes, the change of its internal pressure over time is detected. The pressure drop ΔP is measured based on the time Δt. If the pressure in the system drops quickly, it means that there is a large leak source. If the pressure in the system drops slowly, there is a small leak. If the pressure remains unchanged, there is no leak.

[0006] During the inflation process, the friction of gas molecules will cause heat to be generated. According to the gas equation PV=NRT, it can be seen that the pressure inside the test chamber will increase. When the inflation is completed, the temperature will slowly return to normal room temperature. However, when the voltage stabilization time is long, manufacturers will shorten the voltage stabilization time in order to improve production efficiency. However, if the voltage stabilization time is not long enough, the temperature change cannot be stabilized. When entering the detection process, the temperature change will cause the differential pressure to change, which will reduce the detection accuracy. Summary of the invention

[0007] 1. Technical issues to be solved

[0008] In view of the shortcomings of the prior art, the present invention provides an air tightness detection device for the battery box shell of a new energy vehicle, which solves the problem that the voltage stabilization time is not long enough, the temperature change cannot be stabilized, and when entering the detection process, the temperature change will cause the change of the differential pressure, thereby reducing the detection accuracy.

[0009] (II) Technical solution

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a new energy vehicle battery box shell air tightness detection device, comprising an operating frame, a new energy vehicle battery pack is arranged on one side of the upper surface of the operating frame, and an air tightness leak detector is placed on the other side, the ventilation duct of the air tightness leak detector is connected to the waterproof vent of the new energy vehicle battery pack, and the new energy vehicle battery pack is provided with an adjustment component for shortening the voltage stabilization time to improve the detection efficiency.

[0011] Through the above technical solution, the airtightness leak detector is used to provide power for the new energy vehicle battery pack to inflate the battery pack, so as to perform airtightness detection on the battery pack. During the inflation process, the friction of gas molecules will cause heat to be generated. By arranging the entire assembly on the battery pack of the new energy vehicle, the volume of the test cavity is reduced, the temperature recovery time is shortened, and the voltage stabilization time is shortened. While ensuring the detection accuracy, the possibility of the test cycle becoming longer and affecting the production efficiency is reduced.

[0012] Preferably, the inner cavity of the new energy vehicle battery pack is hollow, and the inner cavity of the new energy vehicle battery pack is fixed with a battery module, a high-voltage wiring harness connecting the battery module, a low-voltage wiring harness for collecting battery module cell signals, a cooling water plate for ensuring that the battery module can effectively dissipate heat during charging and discharging, and a cooling water pipe connected to the cooling water plate. The adjustment component includes a cork pad arranged in the gap between the battery module, the high-voltage wiring harness, the low-voltage wiring harness, the cooling water plate, the cooling water pipe and the new energy vehicle battery pack. The cork pad does not block the waterproof air vents, and the cork pad is detachably fixedly connected to the new energy vehicle battery pack via a connecting component.

[0013] Through the above technical solution, by setting cork pads in the gaps between battery modules, high-voltage wiring harnesses, low-voltage wiring harnesses, cooling water plates, cooling water pipes and new energy vehicle battery packs, the test volume of the inner cavity of the new energy vehicle battery pack cavity is reduced, thereby shortening the stabilization time for the internal temperature of the new energy vehicle battery pack cavity to naturally tend to the external temperature, and reducing the possibility of the test cycle becoming longer and affecting production efficiency.

[0014] Preferably, the connecting assembly includes a plurality of convex strips integrated with the inner cavity groove wall of the new energy vehicle battery pack, and the combination of every two adjacent convex strips presents a triangular cross-section. The outer side wall of the cork pad is fixed with a plurality of triangular protrusions adapted to the convex strips, and the cork pad is tightly connected to the new energy vehicle battery pack through the convex strips and the triangular protrusions.

[0015] Through the above technical solution, the cork pad is conveniently fixedly connected to the battery pack of the new energy vehicle through the cooperation of the convex strips and the triangular convex blocks, and the cork pad is conveniently disassembled and installed.

[0016] Preferably, the air tightness leak detector is provided with a support component for reducing mechanical resonance of the ventilation duct and causing pipeline vibration.

[0017] Through the above technical solution, by setting up a support assembly, it is possible to prevent the pipeline from generating mechanical resonance and causing fatigue damage to the pipeline, thereby reducing the possibility of gas shock in the pipeline, resulting in energy loss and pipeline wear.

[0018] Preferably, the support assembly includes a column fixedly connected to the operating frame and arranged axially, the upper surface of the column is provided with a threaded hole, the ventilation duct is outerly provided with an upper arc plate and a lower arc plate, the upper arc plate and the lower arc plate are combined to be circular and clamp the ventilation duct, the ends of the upper arc plate and the lower arc plate are horizontally bent and extended outward, and the parts of the upper arc plate and the lower arc plate that are horizontally bent and extended outward are provided with circular through holes, and the upper arc plate, the lower arc plate and the column are detachably fixedly connected by screws that penetrate the circular through holes and enter the threaded holes.

[0019] Through the above technical solution, the ventilation duct is clamped by the upper arc plate and the lower arc plate to support and fix the ventilation duct. The upper arc plate, the lower arc plate and the column are fixed by screws to support the ventilation duct, thereby reducing the possibility of the ventilation duct shaking during operation.

[0020] Preferably, a sealed box with a hollow inner cavity and an open top is placed on the operating frame, a support platform is slidably connected inside the sealed box, the new energy vehicle battery pack is placed on the support platform, the size of the support platform is larger than the size of the new energy vehicle battery pack, and both sides of the support platform are provided with extended platform plates of the same height as the support platform, and a control component is provided on the sealed box to control the support platform to move downward, and the two extended platform plates move toward each other and close the top opening of the sealed box.

[0021] Through the above technical solution, the support platform is used to support the new energy vehicle battery pack. In the initial state, the support platform is located above the sealing box, and the two extended platform plates are respectively located on both sides of the support platform and are at the same height as the support platform. The extended platform plates increase the operating space and facilitate air tightness testing. When the air tightness test is completed, if a leakage is detected in the new energy vehicle battery pack and the leakage point needs to be determined, the control component provides power to drive the support platform to move down and into the sealing box. The two extended platform plates move toward each other and close the top opening of the sealing box, which is convenient for detecting the leakage point of the new energy vehicle battery pack.

[0022] Preferably, the control assembly includes two short shafts arranged opposite to each other and rotatably connected to the inner wall of the sealed box, and each of the short shafts is coaxially fixed with a gear, an A rocker arm and an A connecting rod rotatably connected to the sealed box, the two gears are meshed with each other, and each A rocker arm is hingedly connected to a B rocker arm at one end away from the short shaft, and the B rocker arm is hingedly connected to a support platform at one end away from the A rocker arm, and each A connecting rod is hingedly connected to an extended table at one end away from the short shaft, and the inner wall of the sealed box is also hingedly connected to two B connecting rods, and the B connecting rod is hingedly connected to an adjacent extended table at one end away from the sealed box.

[0023] Through the above technical solution, the two gears are meshed with each other, the rotation of one gear will drive the rotation of the other gear, and the short shafts of the two gears will drive the rotation of the short shafts. The power is transmitted through the cooperation of the A rocker arm, the B rocker arm, the A connecting rod and the B connecting rod, so that the support platform moves down and is stored in the sealed box, and the extended table moves toward each other to close the top opening of the sealed box so that the sealed box is in a sealed state.

[0024] Preferably, a mounting seat is fixed to the bottom of the inner groove of the sealing box, an electric push rod is fixed to the middle position of the mounting seat, the extended end of the electric push rod passes through the mounting seat and is slidably connected to the mounting seat, a top plate is fixed to the part of the extended end of the electric push rod that passes through the mounting seat, a lower ear seat is fixed to the side of the top plate that is away from the mounting seat, an upper ear seat is hingedly connected to the lower ear seat, one end of the upper ear seat away from the lower ear seat is fixed to the bottom of the support platform, two relatively arranged guide shafts are fixed to the top plate, the mounting seat is provided with a guide groove adapted to the guide shaft, the guide shaft passes through the mounting seat through the guide groove and is slidably connected to the mounting seat.

[0025] Through the above technical solution, the top plate and the electric push rod are supported by the mounting seat, and the electric push rod provides power to control the up and down movement of the support platform. The cooperation of the guide shaft and the guide groove guides the movement of the top plate in the vertical direction.

[0026] Preferably, the sealed box is provided with a waist-shaped groove for the ventilation duct to move, and a sealing cover plate is detachably fixed on the waist-shaped groove to close the gap between the extended table, the waist-shaped groove and the ventilation duct. An infrared camera is provided on the top of the sealed box, and a cooling component is provided on the ventilation duct to cool down the air in the ventilation duct.

[0027] Through the above technical solution, when the sealing box is in a sealed state, the air flowing through the ventilation duct is cooled by the cooling component, so that the temperature of the air entering the new energy battery pack is slightly lower than the ambient temperature. The temperature field image of the outer surface of the new energy vehicle battery pack is captured by an infrared camera. The position of the singular point in the temperature field image is the leakage position, which is convenient for positioning. Compared with the water inspection method, it reduces costs and improves efficiency.

[0028] Preferably, the cooling component includes an annular sleeve arranged outside the ventilation duct, a water pump located outside the ventilation duct, a cold water tank and a collecting box. The inner cavity of the annular sleeve is hollow, and the inner cavity of the annular sleeve is surrounded by a cold water pipe fixedly connected to the inner cavity of the annular sleeve. The water inlet and water outlet of the cold water pipe both pass through the annular sleeve, the water inlet end of the cold water pipe passing through the annular sleeve is connected to the water inlet of the water pump, and the water outlet end is connected to the water inlet of the collecting box, and the water outlet of the cold water tank is connected to the water inlet of the water pump through a pipeline.

[0029] Through the above technical solution, the water pump provides power, so that the cooling water in the cold water tank enters the cold water pipe, and the air flowing through the ventilation pipe is cooled by the cold water pipe. Then the cooling water enters the collection box and is collected.

[0030] (III) Beneficial effects

[0031] The present invention provides a device for detecting the air tightness of a battery box shell of a new energy vehicle. It has the following beneficial effects:

[0032] (1) The new energy vehicle battery box shell air tightness detection device is powered by an air tightness leak detector to inflate the new energy vehicle battery pack to perform air tightness detection on the new energy vehicle battery pack. During the inflation process, the friction of gas molecules will cause heat to be generated. By arranging the entire component on the new energy vehicle battery pack, the volume of the test chamber is reduced, the temperature recovery time is shortened, and the voltage stabilization time is shortened. While ensuring the detection accuracy, the possibility of the test cycle becoming longer and affecting the production efficiency is reduced.

[0033] (2) The air tightness detection device for the battery box shell of a new energy vehicle prevents the pipeline from generating mechanical resonance and causing fatigue damage to the pipeline by setting a support component, thereby reducing the possibility of gas shock formed by the gas in the pipeline, leading to energy loss and pipeline wear, thereby increasing the service life of the air tightness leak detector and thus improving the detection efficiency of the battery box.

[0034] (3) When the new energy vehicle battery box shell air tightness detection device detects leakage and needs to determine the location of the leakage point, the electric push rod provides power to drive the support platform to move down, and the new energy vehicle battery pack is placed in a sealed box. At the same time, the two extended platform plates move toward each other to the top opening of the sealed box. The sealed box is in a sealed state, and air slightly lower than the ambient temperature is rushed into the new energy battery pack. The infrared camera is turned on and the temperature field image of the outer surface of the new energy vehicle battery pack is captured by the infrared camera. The position with a singular point in the temperature field image is the leakage position, which is convenient for positioning. Compared with the water inspection method, it reduces costs and improves efficiency. There is no need to repeatedly move the new energy vehicle battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the overall left side structure of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of the extended platform used in the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of the support assembly used to embody the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of a battery module used to embody the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of a cork pad used in the present invention;

[0042] Figure 7 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0043] Figure 8 This is a schematic diagram of the structure of the B swing rod used in the present invention;

[0044] Fig. 9 It is a schematic structural diagram of a sealed box of the present invention in a sectional view and viewed from above;

[0045] Fig.10 It is a structural schematic diagram of a partial cross-section of the annular sleeve of the present invention.

[0046] In the figure: 1. operating frame; 2. battery pack of new energy vehicle; 201. battery module; 202. cooling water pipe; 3. airtightness leak detector; 4. ventilation pipe; 5. waterproof vent; 6. adjustment assembly; 601. cork pad; 602. convex strip; 603. triangular convex block; 7. support assembly; 701. column; 702. upper arc plate; 703. lower arc plate; 704. screw; 8. sealing box; 9. support Support platform; 10. Extended platform; 11. Control assembly; 1101. Short shaft; 1102. Gear; 1103. Rocker arm A; 1104. Connecting rod A; 1105. Rocker arm B; 1106. Connecting rod B; 12. Mounting seat; 13. Electric push rod; 14. Top plate; 15. Lower ear seat; 16. Upper ear seat; 17. Guide shaft; 18. Waist groove; 19. Sealing cover plate; 20. Annular sleeve; 21. Cold water pipe. DETAILED DESCRIPTION

[0047] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] like Figure 1-10As shown, the present invention provides a technical solution: a new energy vehicle battery box shell air tightness detection device, comprising an operating frame 1, a new energy vehicle battery pack 2 is arranged on one side of the upper surface of the operating frame 1, and an air tightness leak detector 3 is placed on the other side. The air tightness leak detector 3 is a prior art, so it is not described in detail here. The ventilation duct 4 of the air tightness leak detector 3 is connected with the waterproof air permeable hole 5 of the new energy vehicle battery pack 2. The new energy vehicle battery pack 2 is provided with an adjustment component 6 for shortening the voltage stabilization time to improve the detection efficiency. The new energy vehicle battery pack 2 is powered by the air tightness leak detector 3 to inflate the new energy vehicle battery pack 2 to perform air tightness detection on the new energy vehicle battery pack 2. During the inflation process, the friction of gas molecules will cause heat to be generated. By arranging the entire component on the new energy vehicle battery pack 2, the volume of the test cavity is reduced, the temperature recovery time is shortened, and the voltage stabilization time is further shortened. Under the condition of ensuring the detection accuracy, the possibility of the test cycle becoming longer and affecting the production efficiency is reduced.

[0050] like Figure 5 and Figure 6 The inner cavity of the new energy vehicle battery pack 2 is hollow. The inner cavity of the new energy vehicle battery pack 2 is fixed with a battery module 201, a high-voltage wiring harness connecting the battery module 201, a low-voltage wiring harness for collecting the battery cell signal of the battery module 201, a cooling water plate to ensure that the battery module 201 can effectively dissipate heat during the charging and discharging process, and a cooling water pipe 202 connected to the cooling water plate. The inner cavity of the new energy vehicle battery pack 2 is large in volume. If the inflation time is too short, the enclosed space cannot be filled with gas, and the test result will be inaccurate. If the inflation time is too long, the rhythm of the production line will slow down. In order to solve the above problems, the adjustment component 6 includes a cork pad 601 arranged in the gap between the battery module 201, the high-voltage wiring harness, the low-voltage wiring harness, the cooling water plate, the cooling water pipe 202 and the new energy vehicle battery pack 2. The cork pad 601 does not block the waterproof vent 5. The cork pad 601 is detachably fixedly connected to the new energy vehicle battery pack 2 through a connecting component.

[0051] like Figure 5 and Figure 6 By setting a cork pad 601 in the gap between the battery module 201, the high-voltage wiring harness, the low-voltage wiring harness, the cooling water plate, the cooling water pipe 202 and the new energy vehicle battery pack 2, the cork pad is a natural filling material, the material is light, and has certain moisture-proof, shock-proof and heat-insulating properties. The use of cork pads to fill the gaps in the lithium battery assembly process can improve the safety and life of the battery. The cork pad 601 does not block the battery vents, reduces the test volume of the cavity of the new energy vehicle battery pack 2, and thus shortens the stabilization time of the internal temperature of the cavity of the new energy vehicle battery pack 2 naturally tending to the external temperature, and reduces the possibility of the test cycle becoming longer and affecting production efficiency.

[0052] like Figure 5 and Figure 6The connection component includes a plurality of convex strips 602 integrated with the inner cavity groove wall of the new energy vehicle battery pack 2, and each two adjacent convex strips 602 are combined to form a triangular cross-section. The outer wall of the cork pad 601 is fixed with a plurality of triangular protrusions 603 adapted to the convex strips 602. The cork pad 601 and the new energy vehicle battery pack 2 are tightly connected by the convex strips 602 and the triangular protrusions 603. The convex strips 602 and the triangular protrusions 603 cooperate to facilitate the fixed connection between the cork pad 601 and the new energy vehicle battery pack 2, and facilitate the disassembly and installation of the cork pad 601. In order to improve the connection stability, the cork pad 601 and the new energy vehicle battery pack 2 are also fixed by bolts.

[0053] like Figure 7 In order to further improve the detection efficiency of the battery box, a support component 7 is provided on the airtight leak detector 3 to reduce the mechanical resonance of the ventilation pipe 4 and the vibration of the pipe. By setting the support component 7, the mechanical resonance of the pipe is prevented to cause fatigue damage of the pipe, thereby reducing the possibility of gas shock caused by the gas in the pipe, resulting in energy loss and pipe wear, thereby increasing the service life of the airtight leak detector 3 and improving the detection efficiency of the battery box.

[0054] like Figure 7 The support assembly 7 includes a column 701 fixedly connected to the operating frame 1 and arranged axially. A threaded hole is provided on the upper surface of the column 701. An upper arc plate 702 and a lower arc plate 703 are provided on the outer surface of the ventilation duct 4. The upper arc plate 702 and the lower arc plate 703 are combined to form a circular shape and clamp the ventilation duct 4. The ends of the upper arc plate 702 and the lower arc plate 703 are bent and extended outward horizontally. The upper arc plate 702 and the lower arc plate 703 are bent and extended outward horizontally. The circular through hole, the upper arc plate 702, the lower arc plate 703 and the column 701 are detachably fixedly connected by screws 704 that penetrate the circular through hole and enter the threaded hole. The upper arc plate 702 and the lower arc plate 703 are used to clamp the ventilation duct 4, which supports and fixes the ventilation duct 4. The upper arc plate 702, the lower arc plate 703 and the column 701 are fixed by screws 704 to support the ventilation duct 4 and reduce the possibility of shaking of the ventilation duct 4 during operation.

[0055] like Figure 8 and Fig. 9 A sealed box 8 with a hollow inner cavity and an open top is placed on the operating frame 1. A supporting platform 9 is slidably connected inside the sealed box 8. The new energy vehicle battery pack 2 is placed on the supporting platform 9. The size of the supporting platform 9 is larger than that of the new energy vehicle battery pack 2. Extended platforms 10 with the same height as the supporting platform 9 are provided on both sides of the supporting platform 9. A control component 11 is provided on the sealed box 8 for controlling the support platform 9 to move downward, and the two extended platforms 10 move toward each other and close the top opening of the sealed box 8.

[0056] like Figure 8and Fig. 9 The support platform 9 is used to support the new energy vehicle battery pack 2. In the initial state, the support platform 9 is located above the sealing box 8. The two extended platform plates 10 are respectively located on both sides of the support platform 9 and are at the same height as the support platform 9. The extended platform plates 10 increase the operating space and facilitate airtightness testing. After the airtightness test is completed, if a leakage is detected in the new energy vehicle battery pack 2 and the leakage point needs to be determined, the control component 11 provides power to drive the support platform 9 to move down and put it into the sealing box 8. The two extended platform plates 10 move toward each other and close the top opening of the sealing box 8, which is convenient for detecting the leakage point of the new energy vehicle battery pack 2.

[0057] like Figure 8 and Fig. 9 The control component 11 includes two short shafts 1101 which are arranged opposite to each other and are rotatably connected to the inner wall of the sealed box 8. A gear 1102, an A rocker arm 1103 and an A connecting rod 1104 which are rotatably connected to the sealed box 8 are coaxially fixed on each short shaft 1101. The two gears 1102 are meshed with each other. One end of each A rocker arm 1103 away from the short shaft 1101 is hingedly connected to a B rocker arm 1105. One end of the B rocker arm 1105 away from the A rocker arm 1103 is hingedly connected to the support platform 9. One end of each A connecting rod 1104 away from the short shaft 1101 is hingedly connected to the extended table 10. Two B connecting rods 1106 are also hingedly connected to the inner wall of the sealed box 8. One end of the B connecting rod 1106 away from the sealed box 8 is hingedly connected to the adjacent extended table 10.

[0058] like Figure 8 and Fig. 9 The two gears 1102 are meshed with each other, and the rotation of one gear 1102 will drive the rotation of the other gear 1102. The short shaft 1101 of the two gears 1102 will drive the rotation of the short shaft 1101. The power is transmitted through the cooperation of the A rocker arm 1103, the B rocker arm 1105, the A connecting rod 1104 and the B connecting rod 1106, so that the supporting platform 9 moves down and is put into the sealing box 8, and the extended table 10 moves toward each other to close the top opening of the sealing box 8, so that the sealing box 8 is in a sealed state.

[0059] like Figure 8 and Fig. 9A mounting seat 12 is fixed to the bottom of the inner groove of the sealing box 8, an electric push rod 13 is fixed to the middle position of the mounting seat 12, the extended end of the electric push rod 13 passes through the mounting seat 12 and is slidably connected to the mounting seat 12, and a top plate 14 is fixed to the part of the extended end of the electric push rod 13 that passes through the mounting seat 12, a lower ear seat 15 is fixed to the side of the top plate 14 away from the mounting seat 12, an upper ear seat 16 is hingedly connected to the lower ear seat 15, and one end of the upper ear seat 16 away from the lower ear seat 15 is fixed to the bottom of the support platform 9, and two relatively arranged guide shafts 17 are fixed to the top plate 14, and a guide groove adapted to the guide shaft 17 is opened on the mounting seat 12, and the guide shaft 17 passes through the guide groove to penetrate the mounting seat 12 and is slidably connected to the mounting seat 12.

[0060] like Figure 8 and Fig. 9 The top plate 14 and the electric push rod 13 are supported by the mounting seat 12, and the electric push rod 13 provides power to control the up and down movement of the support platform 9. The cooperation of the guide shaft 17 and the guide groove guides the movement of the top plate 14 in the vertical direction.

[0061] like Figure 1 and Figure 4 A waist-shaped groove 18 is provided on the sealing box 8 for the ventilation duct 4 to move, and a sealing cover plate 19 is detachably fixed on the waist-shaped groove 18 to close the gap between the extended table 10, the waist-shaped groove 18 and the ventilation duct 4. An infrared camera is provided on the top of the sealing box 8, and a cooling component is provided on the ventilation duct 4 to cool down the air in the ventilation duct 4.

[0062] like Figure 1 and Figure 2 and Figure 3 and Figure 4 When the sealing box 8 is in a sealed state, the air flowing through the ventilation duct 4 is cooled by the cooling component, so that the temperature of the air entering the new energy battery pack is slightly lower than the ambient temperature. The temperature field image of the outer surface of the new energy vehicle battery pack 2 is captured by an infrared camera. The position of the singular point in the temperature field image is the leakage position, which is convenient for positioning. Compared with the water inspection method, it reduces costs and improves efficiency.

[0063] like Fig.10 The cooling component includes an annular sleeve 20 sleeved on the outside of the ventilation pipe 4, a water pump, a cold water tank and a collection box located outside the ventilation pipe 4. The inner cavity of the annular sleeve 20 is hollow, and the inner cavity of the annular sleeve 20 is surrounded by a cold water pipe 21 fixedly connected to the inner cavity of the annular sleeve 20. The water inlet and water outlet of the cold water pipe 21 both pass through the annular sleeve 20. The water inlet end of the cold water pipe 21 passing through the annular sleeve 20 is connected to the water inlet of the water pump, and the water outlet end is connected to the water inlet of the collection box, and the water outlet of the cold water tank is connected to the water inlet of the water pump through a pipeline.

[0064] like Fig.10The water pump provides power so that the cooling water in the cold water tank enters the cold water pipe 21, and the air flowing through the ventilation pipe 4 is cooled through the cold water pipe 21, and then the cooling water enters the collection box to be collected.

[0065] When in use, when performing air tightness testing, the new energy vehicle battery pack 2 is placed on the supporting platform 9, the ventilation pipe 4 of the air tightness leak detector 3 is connected to the waterproof air permeable hole 5 of the new energy vehicle battery pack 2, and the new energy vehicle battery pack 2 is inflated through the air tightness leak detector 3. Since the inner cavity of the new energy vehicle battery pack 2 is fixedly connected with the cork pad 601 through the convex strip 602 and the triangular convex block 603, the cork pad 601 is located in the gap between the battery module 201, the high-voltage wiring harness, the low-voltage wiring harness, the cooling water plate, the cooling water pipe 202 and the new energy vehicle battery pack 2, the test volume of the inner cavity of the new energy vehicle battery pack 2 is reduced, the air intake time is shortened, and the stabilization time of the internal temperature of the cavity of the new energy vehicle battery pack 2 naturally tends to the external temperature is shortened, the possibility of the test cycle becoming longer and affecting the production efficiency is reduced, and the efficiency of repeated air tightness testing is also improved;

[0066] When the air tightness test is completed, if the air tightness of the new energy vehicle battery pack 2 is good, the new energy vehicle battery pack 2 is removed and replaced with the next new energy vehicle battery pack 2. If the new energy vehicle battery pack 2 is leaking and the leak point needs to be determined, the electric push rod 13 is turned on, and the electric push rod 13 provides power to drive the support platform 9 hingedly connected to the extended end of the electric push rod 13 to move downward. The support platform 9 is slidably connected to the sealing box 8. The downward movement of the support platform 9 will drive the rotation of the gear 1102, the A rocker arm 1103, the B rocker arm 1105, the A connecting rod 1104 and the B connecting rod 1106, so that the support platform 9 and the new energy vehicle battery pack 2 on the support platform 9 are stably moved downward and stored in the sealing box 8;

[0067] At the same time, the gear 1102, the A swing rod 1103, the B swing rod 1105, the A connecting rod 1104 and the B connecting rod 1106 cooperate to transmit power, driving the two extended platforms 10 to move toward each other to close the top opening of the sealing box 8, and at the same time, the sealing cover plate 19 is manually closed to close the waist groove 18. The sealing cover plate 19, the extended platform 10 and the sealing box 8 are all provided with rubber sealing strips, so that the sealing box 8 is in a sealed state;

[0068] The sealing box 8 is provided with a pressure gauge and a thermometer for detecting the pressure and temperature inside the sealing box 8. When the sealing box 8 is in a sealed state, the water pump is turned on, and the water pump provides power to allow the cooling water in the cold water tank to enter the cold water pipe 21. The cold water pipe 21 cools the air flowing through the ventilation duct 4, so that the temperature of the air entering the new energy battery pack is slightly lower than the ambient temperature. The infrared camera is turned on, and the temperature field image of the outer surface of the new energy vehicle battery pack 2 is captured by the infrared camera. The position of the singular point in the temperature field image is the leakage position, which is convenient for positioning, and compared with the water inspection method, it reduces costs and improves efficiency. This is the use process of the new energy vehicle battery box shell airtightness detection device. At the same time, the contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0069] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new energy vehicle battery box housing air tightness detection device, comprising an operating frame (1), characterized in that: A new energy vehicle battery pack (2) is arranged on one side of the upper surface of the operating frame (1), and an airtightness leak detector (3) is placed on the other side; the ventilation duct (4) of the airtightness leak detector (3) is connected to the waterproof vent hole (5) of the new energy vehicle battery pack (2); and an adjustment component (6) for shortening the voltage stabilization time to improve the detection efficiency is arranged on the new energy vehicle battery pack (2).

2. A new energy vehicle battery box housing air tightness detection device according to claim 1, characterized in that: The inner cavity of the new energy vehicle battery pack (2) is hollow, and the inner cavity of the new energy vehicle battery pack (2) is fixed with a battery module (201), a high-voltage wire harness connected to the battery module (201), a low-voltage wire harness for collecting cell signals of the battery module (201), a cooling water plate for ensuring that the battery module (201) can effectively dissipate heat during the charging and discharging process, and a cooling water pipe (202) connected to the cooling water plate. The adjustment component (6) comprises a cork pad (601) arranged in the gap between the battery module (201), the high-voltage wire harness, the low-voltage wire harness, the cooling water plate, the cooling water pipe (202) and the new energy vehicle battery pack (2), the cork pad (601) does not block the waterproof vent (5), and the cork pad (601) is detachably fixedly connected to the new energy vehicle battery pack (2) via a connecting component.

3. A new energy vehicle battery box housing air tightness detection device according to claim 2, characterized in that: The connection assembly comprises a plurality of convex strips (602) integrated with the inner cavity wall of the new energy vehicle battery pack (2), and each two adjacent convex strips (602) are combined to form a triangular cross-section. The outer wall of the cork pad (601) is fixed with a plurality of triangular protrusions (603) adapted to the convex strips (602), and the cork pad (601) and the new energy vehicle battery pack (2) are plugged tightly connected via the convex strips (602) and the triangular protrusions (603).

4. A new energy vehicle battery box housing air tightness detection device according to claim 1, characterized in that: The airtightness leak detector (3) is provided with a support assembly (7) for reducing mechanical resonance of the ventilation pipeline (4) and causing pipeline vibration.

5. A new energy vehicle battery box housing air tightness detection device according to claim 4, characterized in that: The support assembly (7) comprises a column (701) fixedly connected to the operating frame (1) and arranged axially, a threaded hole being provided on the upper surface of the column (701), an upper arc plate (702) and a lower arc plate (703) being provided on the outer sleeve of the ventilation duct (4), the upper arc plate (702) and the lower arc plate (703) being combined to form a circular shape and clamp the ventilation duct (4), the ends of the upper arc plate (702) and the lower arc plate (703) being bent and extended outward horizontally, a circular through hole being provided in the parts of the upper arc plate (702) and the lower arc plate (703) being bent and extended outward horizontally, and the upper arc plate (702), the lower arc plate (703) and the column (701) being detachably fixedly connected by screws (704) penetrating the circular through hole and entering the threaded hole.

6. A new energy vehicle battery box housing air tightness detection device according to claim 1, characterized in that: A sealed box (8) with a hollow inner cavity and an open top is placed on the operating frame (1); a support platform (9) is slidably connected inside the sealed box (8); the new energy vehicle battery pack (2) is placed on the support platform (9); the size of the support platform (9) is larger than the size of the new energy vehicle battery pack (2); both sides of the support platform (9) are provided with extended platforms (10) of the same height as the support platform (9); and a control component (11) is provided on the sealed box (8) for controlling the support platform (9) to move downward, so that the two extended platforms (10) move toward each other and close the top opening of the sealed box (8).

7. A new energy vehicle battery box housing air tightness detection device according to claim 6, characterized in that: The control assembly (11) comprises two short shafts (1101) arranged opposite to each other and rotatably connected to the inner wall of the sealing box (8); a gear (1102) rotatably connected to the sealing box (8), an A swing rod (1103) and an A connecting rod (1104) are coaxially fixed on each of the short shafts (1101); the two gears (1102) are meshed with each other; and one end of each of the A swing rods (1103) away from the short shaft (1101) is hingedly connected to a B swing rod. (1105), one end of the B rocker arm (1105) away from the A rocker arm (1103) is hingedly connected to the support platform (9), one end of each A connecting rod (1104) away from the short axis (1101) is hingedly connected to the extended table (10), and the inner wall of the sealed box (8) is also hingedly connected to two B connecting rods (1106), and one end of the B connecting rod (1106) away from the sealed box (8) is hingedly connected to the adjacent extended table (10).

8. A new energy vehicle battery box housing air tightness detection device according to claim 6, characterized in that: A mounting seat (12) is fixed at the bottom of the inner cavity groove of the sealing box (8), an electric push rod (13) is fixed at the middle position of the mounting seat (12), an extended end of the electric push rod (13) passes through the mounting seat (12) and is slidably connected to the mounting seat (12), a top plate (14) is fixed to the part of the extended end of the electric push rod (13) that passes through the mounting seat (12), a lower ear seat (15) is fixed on the side of the top plate (14) away from the mounting seat (12), an upper ear seat (16) is hingedly connected to the lower ear seat (15), and one end of the upper ear seat (16) away from the lower ear seat (15) is fixed to the bottom of the support platform (9), two guide shafts (17) arranged oppositely are fixed on the top plate (14), a guide groove adapted to the guide shaft (17) is opened on the mounting seat (12), and the guide shaft (17) passes through the mounting seat (12) through the guide groove and is slidably connected to the mounting seat (12).

9. A new energy vehicle battery box housing air tightness detection device according to claim 6, characterized in that: The sealing box (8) is provided with a waist-shaped groove (18) for the ventilation duct (4) to move, and a sealing cover plate (19) is detachably fixed on the waist-shaped groove (18) to close the gap between the extended platform (10), the waist-shaped groove (18) and the ventilation duct (4). An infrared camera is provided on the top of the sealing box (8), and a cooling component is provided on the ventilation duct (4) to cool the air in the ventilation duct (4).

10. A new energy vehicle battery box housing air tightness detection device according to claim 9, characterized in that: The cooling component comprises an annular sleeve (20) sleeved outside the ventilation pipe (4), a water pump, a cold water tank and a collection tank located outside the ventilation pipe (4); the inner cavity of the annular sleeve (20) is hollow; the inner cavity of the annular sleeve (20) is surrounded by a cold water pipe (21) fixedly connected to the inner cavity of the annular sleeve (20); the water inlet end and the water outlet end of the cold water pipe (21) both pass through the annular sleeve (20); the water inlet end of the cold water pipe (21) passing through the annular sleeve (20) is connected to the water inlet of the water pump, and the water outlet end is connected to the water inlet of the collection tank; the water outlet of the cold water tank is connected to the water inlet of the water pump through a pipeline.

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