Air tightness detection device for battery pack

Abstract

The utility model belongs to the field of detection devices, and particularly relates to an air tightness detection device for a battery pack, which comprises a support, and an air tightness detector is mounted at the top of the support. The air tightness detector is used for detecting the air tightness of the battery pack; an air pump is mounted at the top of the support; the output end of the air pump is communicated with an air inlet pipe; a connecting pipe is arranged at the end part of the air inlet pipe; a cover plate is slidably connected to the inner wall of the connecting pipe. A drying box is arranged in the connecting pipe; the middle part of the connecting pipe is connected with a gas conveying pipe; the air inlet pipe, the connecting pipe and the air delivery pipe are communicated; a fixing assembly for fixing the battery pack is arranged in the middle of the support; and through the matching effect of the cover plate and the drying box, the airflow can be dried by the drying box when passing through the connecting pipe, so that the moisture in the pressurized airflow is reduced, and the erosion and damage effects of the moisture on internal parts of the battery pack are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection device field, specifically a kind of airtightness detection device of battery pack. BACKGROUND

[0002] Battery pack, also known as PACK package, is the core component of many electronic devices and new energy vehicles. It is usually composed of multiple battery monomers, battery management systems, connecting pieces, housings, cooling systems and other components, for storing and providing electrical energy. The performance and safety of battery pack are directly related to the performance, life and safety of the entire device or vehicle.

[0003] Airtightness detection is an indispensable key link in the production process of battery pack. The inside of battery pack is full of electrolyte or other chemical substances. If the sealing performance is poor, moisture, dust and other impurities may enter the inside, causing short circuit, corrosion and other faults, and even safety accidents in serious cases.

[0004] In the prior art, battery pack detection usually needs to go through the process of "pressurization, pressure stabilization, testing and pressure relief". In use and observation, it is found that if the air humidity is high during the pressurization of battery pack, the internal components of battery pack will be eroded, which will affect the testing process.

[0005] Therefore, an airtightness detection device for battery pack is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0007] The utility model solves the technical problems by adopting the following technical scheme: the utility model discloses an airtightness detection device for battery pack, which comprises a support, and an airtightness detector is installed on the top of the support; the airtightness detector is used for detecting the airtightness of battery pack; a gas pump is installed on the top of the support; a gas inlet pipe is connected to the output end of the gas pump; a connecting pipe is arranged at the end of the gas inlet pipe; a cover plate is slidably connected to the inner wall of the connecting pipe; a drying box is arranged in the connecting pipe; a gas conveying pipe is connected to the middle of the connecting pipe; the gas inlet pipe, the connecting pipe and the gas conveying pipe are in communication; a fixing assembly is arranged in the middle of the support for fixing the battery pack; through the cooperation of the cover plate and the drying box, the airflow passing through the connecting pipe can be dried by the drying box, reducing the moisture in the pressurized airflow and reducing the erosion and damage of these moisture to the internal components of the battery pack.

[0008] Preferably, the end of the air inlet pipe is provided with a condenser pipe; the condenser pipe is located between the air inlet pipe and the connecting pipe; the condenser pipe, the air inlet pipe and the connecting pipe are in communication; the bottom of the condenser pipe is provided with a drain pipe; the top of the support is provided with a cooling pipe; the cooling pipe and the condenser pipe are correspondingly arranged; by arranging the condenser pipe, the pressurized airflow in the condenser pipe can be pre-dried at low temperature, further reducing the humidity of the airflow, and also reducing the burden of the drying box on the airflow drying, reducing the frequency of replacing the drying box.

[0009] Preferably, the inside of the condenser pipe is fixedly connected with a plurality of baffles; a cavity is arranged between the baffles and the inner wall of the condenser pipe; adjacent baffles are arranged in a staggered manner; by arranging the baffles, when the airflow flows in the condenser pipe, the flow path is increased under the obstruction of the condenser pipe, thereby increasing the time of airflow being cold-dried, improving the drying effect of the device on the airflow, and at the same time, because the baffles and the inner wall of the condenser pipe are provided with a cavity, the water droplets flowing in the condenser pipe will not be hindered by the condenser pipe.

[0010] Preferably, the fixing assembly comprises a motor; the motor and the support are in fixed connection; the output end of the motor is fixedly connected with a reversible screw rod; the reversible screw rod and the support are in rotary connection; the reversible screw rod is symmetrically connected with a sliding plate in the middle; the sliding plate and the support are in sliding connection; each sliding plate is symmetrically fixedly connected with a pressing plate on the top; the pressing plate is in L-shaped structure; when the battery pack needs to be fixed, the motor can be started to make the reversible screw rod rotate, and the reversible screw rod drives a pair of sliding plates to move towards each other until the battery pack is clamped by a pair of sliding plates together with the pressing plate, realizing the quick fixing of the device on the battery pack, and also enabling the battery pack to be in the central area of the reversible screw rod under the guidance of a pair of sliding plates, improving the accuracy of the position of the battery pack during detection, and facilitating the detection operation of the battery pack.

[0011] Preferably, a plurality of elastic ropes are fixedly connected between a pair of adjacent pressing plates; a plurality of clamping blocks are fixedly connected to the middle of the elastic rope; the clamping block is in polygonal structure; through the cooperation of the cooling pipe and the condenser pipe, when the pressing plate contacts the battery pack, the elastic rope and the clamping block also contact the battery pack, part of the elastic rope is stretched under the extrusion of the battery pack surface modeling, and part of the clamping block on the elastic rope is clamped into the battery pack modeling, and part of the clamping block is placed on the surface of the battery pack, increasing the contact area and the extrusion effect of the device on the battery pack, and improving the stability of the battery pack during fixing.

[0012] Preferably, the inner wall of the pressing plate is fixed with a rubber pad; the surface of the rubber pad is arc-shaped; when the corner part of the battery pack is pressed by the pressing plate, the rubber pad will contact the battery pack first, because the rubber pad is a flexible material, the pressure on the surface of the battery pack and the rubber pad will be dispersed when they contact, thereby reducing the extrusion effect on the corner part of the battery pack and reducing the damage of the battery pack caused by excessive extrusion.

[0013] The utility model has the advantages that:

[0014] 1. The utility model discloses a kind of gas tightness detection devices of battery pack, by the cooperation of cover plate and drying box, so that airflow can be dried by drying box when passing through connecting pipe, reduce the moisture in pressurized airflow, reduce the erosion, damage effect of these moisture to internal components of battery pack.

[0015] 2. The utility model discloses a kind of gas tightness detection devices of battery pack, by being provided with condenser pipe, so that pressurized airflow in condenser pipe can be low-temperature pre-dried, further reduce the humidity of airflow, while also reduce the burden of drying box to airflow drying, reduce the frequency of replacement of drying box. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the present utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0017] Figure 1 It is the main body schematic view of the present utility model;

[0018] Figure 2 It is the structure schematic view of connecting pipe in the present utility model;

[0019] Figure 3 It is the structure schematic view of cover plate in the present utility model;

[0020] Figure 4 It is the structure schematic view of baffle in the present utility model;

[0021] Figure 5 It is the structure schematic view of slide plate in the present utility model.

[0022] In the figure: 1, support; 12, air tightness detector; 13, air pump; 14, air inlet pipe; 15, connecting pipe; 16, cover plate; 17, drying box; 18, air conveying pipe; 2, cooling pipe; 22, condenser pipe; 23, drain pipe; 3, baffle; 4, motor; 42, lead screw; 43, sliding plate; 44, pressing plate; 5, elastic rope; 52, clamping block; 6, rubber pad. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Specific embodiments are given below.

[0025] Please refer to Figures 1 to 5As shown, the utility model discloses a kind of air tightness detection device of battery pack, including support 1, the top of support 1 is equipped with air tightness detector 12;The air tightness detector 12 is used to detect the air tightness of battery pack;The top of support 1 is equipped with air pump 13;The output of air pump 13 is communicated with air inlet pipe 14;Air inlet pipe 14 end is equipped with connecting pipe 15;Connecting pipe 15 inner wall is slidably connected with cover plate 16;Drying box 17 is equipped in connecting pipe 15;Connecting pipe 15 middle part is connected with gas delivery pipe 18;Air inlet pipe 14, connecting pipe 15, gas delivery pipe 18 are in communication relationship;The middle part of support 1 is equipped with the fixed assembly for fixing battery pack;When working, battery pack can be placed on the top of support 1 and be fixed by fixed assembly, then gas delivery pipe 18 and battery pack can be connected and by starting air pump 13, so that airflow can pass through air inlet pipe 14, connecting pipe 15, gas delivery pipe 18 into the inside of battery pack, realize the pressurization of battery pack, pressurization to predetermined value can stop pressurization and wait for a period of time, so that the internal pressure of battery pack is stable, then air tightness detector 12 and battery pack can be connected, and the internal pressure of battery pack is detected by air tightness detector 12, to determine whether the air tightness in battery pack is good, after detection, battery pack gas can be discharged, above all belong to mature prior art, therefore, do not repeat, when air pump 13 pressurizes to the inside of battery pack, pressurized airflow will pass through connecting pipe 15 by air inlet pipe 14, and the drying agent in drying box 17 can absorb moisture in airflow, realize the drying of airflow, reduce the erosion effect of moisture in airflow to the internal element of battery pack, simultaneously by setting cover plate 16, when needing to replace drying box 17, only need to pull the handle on cover plate 16 and slide into the inside of connecting pipe 15, so that drying box 17 can be quickly taken and placed, improve the convenience of device to replace drying box 17;Through the cooperation of cover plate 16 and drying box 17, airflow can be dried by drying box 17 when passing through connecting pipe 15, reduce the moisture in pressurized airflow, reduce the erosion and damage effect of these moisture to the internal component of battery pack.

[0026] Please refer to Figure 2 And Figure 4As shown, the end of the air inlet pipe 14 is provided with a condenser pipe 22; the condenser pipe 22 is located between the air inlet pipe 14 and the connecting pipe 15; the condenser pipe 22, the air inlet pipe 14 and the connecting pipe 15 are in communication; the bottom of the condenser pipe 22 is provided with a drain pipe 23; the top of the support 1 is provided with a cooling pipe 2; the cooling pipe 2 and the condenser pipe 22 are correspondingly arranged; when the battery pack is pressurized, the cooling pipe 2 can be connected to the air cooler to blow cold air to the outer wall of the condenser pipe 22, so that the temperature inside the condenser pipe 22 is reduced, and the water vapor inside the condenser pipe 22 is liquefied under the action of low temperature when the airflow passes through the condenser pipe 22, realizing the pre-drying of the device to the airflow, the water droplets after liquefaction can be discharged by opening the valve at the drain pipe 23, the specific operation of discharging can be to close the valve between the connecting pipe 15 and the condenser pipe 22, so that the water droplets inside the condenser pipe 22 are discharged under the action of positive pressure, and the discharged water droplets can be collected by the related collecting device, which will not be described here, it is worth mentioning that the above-mentioned valve is a mature prior art, so it is not shown in the figure; by arranging the condenser pipe 22, the pressurized airflow in the condenser pipe 22 can be pre-dried by low temperature, further reducing the humidity of the airflow, and also reducing the burden of the drying box 17 on the airflow drying, reducing the replacement frequency of the drying box 17.

[0027] Please refer to Figure 4 As shown, the inside of the condenser pipe 22 is fixedly connected with a plurality of baffles 3; the baffle 3 and the inner wall of the condenser pipe 22 are provided with a cavity; adjacent baffles 3 are staggered; by arranging the baffle 3, when the airflow flows in the condenser pipe 22, the flow path will be increased under the obstruction of the condenser pipe 22, thereby increasing the time of airflow being cold dried, improving the drying effect of the device to the airflow, and at the same time, because the baffle 3 and the inner wall of the condenser pipe 22 are provided with a cavity, the water droplets flowing in the condenser pipe 22 will not be hindered by the condenser pipe 22.

[0028] Please refer to Figure 1 and Figure 5 As shown, the fixing assembly comprises a motor 4; the motor 4 and the support 1 are in fixed connection; the output end of the motor 4 is fixedly connected with a positive and negative screw rod 42; the positive and negative screw rod 42 and the support 1 are in rotary connection; the positive and negative screw rod 42 is symmetrically connected with a sliding plate 43 in the middle; the sliding plate 43 and the support 1 are in sliding connection; each sliding plate 43 is symmetrically fixedly connected with a pressing plate 44 at the top; the pressing plate 44 is in L-shaped structure; when it is needed to fix the battery pack, the motor 4 can be started to make the positive and negative screw rod 42 rotate, the positive and negative screw rod 42 will drive a pair of sliding plates 43 to move towards each other until the battery pack is clamped and pressed by a pair of sliding plates 43 together with the pressing plate 44, realizing the quick fixing of the device to the battery pack, and at the same time, the battery pack can be guided by a pair of sliding plates 43 to be in the central region of the positive and negative screw rod 42, improving the accuracy of the position of the battery pack during detection, and facilitating the detection operation of the battery pack.

[0029] As shown in Figure 5 As shown in, a plurality of elastic ropes 5 are fixed between the adjacent pair of pressing plates 44; the middle part of the elastic ropes 5 is fixed with a plurality of clamping blocks 52; the clamping blocks 52 are polygonal structures; through the cooperation of the cooling pipe 2 and the condensing pipe 22, when the pressing plate 44 and the battery pack are in contact, the elastic rope 5 and the clamping block 52 also come into contact with the battery pack, part of the elastic rope 5 will be stretched under the extrusion of the battery pack surface modeling, and part of the clamping block 52 on the elastic rope 5 will be clamped into the battery pack modeling, and part of it will be placed on the surface of the battery pack, increasing the contact area and the extrusion of the device on the battery pack, and improving the stability of the battery pack when fixed.

[0030] As shown in Figure 5 As shown in, the inner wall of the pressing plate 44 is fixed with a rubber pad 6; the surface of the rubber pad 6 is arc-shaped structure; through the setting of the rubber pad 6, when the corner of the battery pack is extruded by the pressing plate 44, the rubber pad 6 will come into contact with the battery pack first, because the rubber pad 6 is a flexible material, the pressure on the surface of the battery pack and the rubber pad 6 will be dispersed when they come into contact, thereby reducing the extrusion of the corner of the battery pack, and reducing the damage of the battery pack caused by excessive extrusion.

[0031] Working principle: the battery pack is placed on the top of the support 1 and fixed by the fixing assembly, then the gas pipe 18 and the battery pack can be connected, and the gas pump 13 is started, so that the gas flow can enter the inside of the battery pack through the air inlet pipe 14, the connecting pipe 15 and the gas pipe 18, and the battery pack is pressurized, and when the pressure reaches the predetermined value, the pressurization can be stopped and a period of time is waited, so that the internal pressure of the battery pack is stable, then the gas tightness detector 12 and the battery pack are connected, and the internal pressure of the battery pack is detected by the gas tightness detector 12 to judge whether the internal gas tightness of the battery pack is good, all the above belong to mature prior art, so it is not repeated, when the gas pump 13 pressurizes the inside of the battery pack, the pressurized gas flow will flow through the connecting pipe 15 through the air inlet pipe 14, and the drying agent in the drying box 17 will absorb the water in the gas flow to dry the gas flow and reduce the erosion of the battery pack internal components, at the same time, by setting the cover plate 16, when the drying box 17 needs to be replaced, only the handle on the cover plate 16 is pulled to slide into the connecting pipe 15 to quickly take and place the drying box 17, improving the convenience of replacing the drying box 17; when the battery pack is pressurized, the cooling pipe 2 is connected with the air cooler to blow cold air on the outer wall of the condenser pipe 22, so that the temperature in the condenser pipe 22 is reduced, and when the gas flow passes through the condenser pipe 22, the water vapor in the condenser pipe 22 is liquefied under the action of low temperature, realizing the pre-drying of the device to the gas flow, the water droplets after liquefaction can be discharged by opening the valve at the drain pipe 23, the specific operation of discharging can be to close the valve between the connecting pipe 15 and the condenser pipe 22, so that the water droplets in the condenser pipe 22 are discharged under the action of positive pressure, and the discharged water droplets can be collected by the related collecting device, which is not repeated here, it is worth mentioning that the above valve is mature prior art, so it is not shown in the figure; by setting the baffle 3, when the gas flow flows in the condenser pipe 22, the flow path is increased under the obstruction of the condenser pipe 22, thereby increasing the time of the gas flow being dried by cold, improving the drying effect of the device to the gas flow, at the same time, because the baffle 3 and the inner wall of the condenser pipe 22 are provided with cavities, the water droplets in the condenser pipe 22 will not be hindered by the condenser pipe 22 when flowing; when the battery pack needs to be fixed, the motor 4 is started to make the forward and reverse screw rod 42 rotate, which drives a pair of sliding plates 43 to move towards each other until the battery pack is clamped by a pair of sliding plates 43 together with the pressing plate 44, realizing the quick fixing of the device to the battery pack, and also making the battery pack in the center area of the forward and reverse screw rod 42 under the guidance of a pair of sliding plates 43, improving the accuracy of the position of the battery pack during detection;When the pressing plate 44 and the battery pack are in contact, the elastic rope 5 and the clamping block 52 also come into contact with the battery pack, part of the elastic rope 5 is stretched under the extrusion of the surface modeling of the battery pack, and part of the clamping block 52 on the elastic rope 5 is clamped into the interior of the battery pack modeling or placed on the surface of the battery pack, thereby increasing the contact area and the extrusion effect of the device on the battery pack; the rubber pad 6 is arranged, so that when the corner of the battery pack is extruded by the pressing plate 44, the rubber pad 6 comes into contact with the battery pack earlier than the pressing plate 44, and because the rubber pad 6 is a flexible material, the surface pressure of the battery pack and the rubber pad 6 is dispersed when they come into contact, thereby reducing the extrusion effect on the corner of the battery pack.

[0032] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A device for detecting the air tightness of a battery pack, comprising a support (1), characterized in that: The top of the support (1) is provided with a gas tightness detector (12); the gas tightness detector (12) is used for detecting the gas tightness of the battery pack; the top of the support (1) is provided with a gas pump (13); the output end of the gas pump (13) is communicated with an air inlet pipe (14); the end of the air inlet pipe (14) is provided with a connecting pipe (15); the inner wall of the connecting pipe (15) is slidably connected with a cover plate (16); the inside of the connecting pipe (15) is provided with a drying box (17); the middle of the connecting pipe (15) is connected with a gas conveying pipe (18); the air inlet pipe (14), the connecting pipe (15) and the gas conveying pipe (18) are in communication; the middle of the support (1) is provided with a fixing assembly for fixing the battery pack.

2. The air tightness detection device of a battery pack according to claim 1, characterized in that: The end of the air inlet pipe (14) is provided with a condenser pipe (22); the condenser pipe (22) is located between the air inlet pipe (14) and the connecting pipe (15); the condenser pipe (22), the air inlet pipe (14) and the connecting pipe (15) are in communication; the bottom of the condenser pipe (22) is provided with a drain pipe (23); the top of the support (1) is provided with a cooling pipe (2); the cooling pipe (2) and the condenser pipe (22) are correspondingly arranged.

3. The air tightness detection device of a battery pack according to claim 2, characterized in that: The inside of the condenser pipe (22) is fixedly connected with a plurality of baffles (3); the baffles (3) and the inner wall of the condenser pipe (22) are provided with cavities; adjacent baffles (3) are arranged in a staggered manner.

4. The air tightness detection device of a battery pack according to claim 3, characterized in that: The fixing assembly comprises a motor (4); the motor (4) and the support (1) are fixedly connected; the output end of the motor (4) is fixedly connected with a reversible screw rod (42); the reversible screw rod (42) and the support (1) are rotatably connected; the middle of the reversible screw rod (42) is symmetrically screw-connected with a sliding plate (43); the sliding plate (43) and the support (1) are slidably connected; the top of each sliding plate (43) is symmetrically fixedly connected with a pressing plate (44); the pressing plate (44) is an L-shaped structure.

5. The air tightness detection device of a battery pack according to claim 4, characterized in that: A plurality of elastic ropes (5) are fixedly connected between adjacent pairs of pressing plates (44); the middle of each elastic rope (5) is fixedly connected with a plurality of clamping blocks (52); the clamping blocks (52) are polygonal structures.

6. The air tightness detection device of a battery pack according to claim 5, wherein: The inner wall of the pressing plate (44) is fixedly connected with a rubber pad (6); the surface of the rubber pad (6) is an arc-shaped structure.

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