Air tightness detection device

Abstract

The air tightness detection device comprises an air tank, a box body, an inner mold core and a detector, a containing cavity is formed in the box body, an air inlet channel and an air outlet channel are formed in the box body, and the air inlet channel is communicated with the air tank; the detector is communicated with the air outlet channel. According to the scheme provided by the invention, the position of the welding seam can be detected in a targeted manner.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an airtightness detection device. Background Art

[0002] In the production process of lithium batteries, the airtightness test of the lithium battery shell is a very important process in the battery production process, which can affect the service life of the lithium battery.

[0003] When the detection device in the related art is used, it is not possible to perform targeted detection on the weld position on the shell. Utility Model Content

[0004] In view of the above problems, the present application provides an airtightness detection device, which can solve the problem that the detection device cannot perform targeted detection on the weld position on the shell when in use.

[0005] In order to solve the above technical problems, the present application proposes an airtightness detection device, comprising:

[0006] Gas tank,

[0007] A box body, wherein the box body has a containing cavity, and the box body is provided with an air inlet channel and an air outlet channel, wherein the air inlet channel is connected to the gas tank;

[0008] An inner mold core, the inner mold core is arranged in the accommodating cavity, an air passage is arranged inside the inner mold core, the inner mold core is provided with an open groove, and the air inlet passage, the air outlet passage and the open groove are respectively communicated with the air passage;

[0009] Under the condition that the outer shell is sleeved on the inner mold core, the two sides of the outer shell along the height direction are sealed with the two sides of the box along the height direction;

[0010] A detector, the detector being communicated with the air outlet passage;

[0011] Along one side of the box body in the height direction, the opening groove is arranged toward the welding seam on the shell.

[0012] In the technical solution of the embodiment of the present application, after the outer shell is sleeved on the inner mold core, the two sides of the outer shell along the height direction are sealed with the two sides of the box body along the height direction, and the outer shell and the box body form a sealed cavity, and the inner mold core is located in the formed sealed cavity. At this time, the gas tank sprays into the airway through the air inlet channel, and the sprayed gas is located in the sealed cavity. After the pressure is maintained for a preset time, the leakage rate in the sealed cavity is detected by the detector, so that the sealing of the weld on the outer shell can be detected. Since the opening groove on the inner mold core is arranged toward the weld on the outer shell, and the opening groove is connected to the airway, the gas sprayed from the gas tank will quickly flow to the opening groove after passing through the air inlet channel and the airway, and then spray to the weld. In this way, the weld position can be detected in a targeted manner. At the same time, since the inner mold core is located in the sealed cavity, under the condition that the inner mold core occupies the volume in the sealed cavity, the amount of gas used in the sealed cavity can be reduced, thereby reducing the testing cost.

[0013] In some embodiments, the gas channel includes a first channel and a second channel, the first channel and the second channel intersect, one end of the first channel is connected to the air inlet channel, the other end is connected to the air outlet channel, and the second channel is connected to the open slot. In this way, the gas sprayed from the gas tank can quickly enter the second channel through the air inlet channel and the first channel, and finally spray to the weld through the open slot.

[0014] In some embodiments, the box body includes a top cover, a side panel and a base, and the top cover, the side panel and the base are connected and arranged to form the accommodating cavity;

[0015] The air inlet channel is arranged on the top cover, and the air outlet channel is arranged on the base;

[0016] When the outer shell is sleeved on the inner mold core, the outer shell is sealed with the top cover and the base at both sides along the height direction. Since the box body includes the top cover, the side panels and the base, it is convenient to open the box body so as to put the inner mold core and the outer shell into the box body.

[0017] In some embodiments, a first groove is provided on a side of the top cover facing the base, and the air inlet channel is connected to the first groove;

[0018] A trapezoidal portion is provided on one side of the inner mold core facing the top cover; the opening groove is connected to the trapezoidal portion;

[0019] When the top cover is arranged on the side plate, the trapezoidal portion is located in the first groove, and the side of the trapezoidal portion facing the top cover abuts against the top cover. Since the air intake channel is connected with the first groove, and the trapezoidal portion is connected with the opening groove, the gas ejected from the gas tank will pass through the air intake channel, the first groove, and the inclined surface of the trapezoidal portion and then quickly flow to the opening groove.

[0020] In some embodiments, the side plate includes a first outer mold and a second outer mold, the top cover abuts against one side of the first outer mold and the second outer mold along the height direction, and the base abuts against the other side of the first outer mold and the second outer mold along the height direction;

[0021] The top cover, the first outer mold, the second outer mold and the base together enclose the accommodating cavity. In this way, it is convenient to disassemble the side panel.

[0022] In some embodiments, a protrusion is provided on the side of the first outer mold facing the second outer mold, and a second groove is provided on the side of the second outer mold facing the first outer mold, and the protrusion cooperates with the second groove. In this way, the sealing of the connection between the first outer mold and the second outer mold can be ensured.

[0023] In some embodiments, the airtightness detection device further comprises a sealing ring, which is arranged on the side of the base facing the side plate; and the side of the side plate facing the base abuts against the sealing ring, so that the sealing between the side plate and the base can be ensured.

[0024] In some embodiments, the air tightness detection device further comprises an elastic member, which is arranged on a side of the inner mold core facing the base, and the elastic member abuts against the sealing ring, so as to further ensure the sealing between the side plate and the base.

[0025] In some embodiments, the air tightness detection device further comprises a driving member, and the driving member is arranged on a side of the top cover away from the side plate, so that the top cover can be fastened to the side plate.

[0026] In some embodiments, the air tightness detection device further comprises a fastener, which is disposed between the inner mold core and the base and is used to fix the inner mold core to the base, so that the inner mold core can be stably located on the base.

[0027] In some embodiments, the airtightness detection device further includes a first pipeline and a vacuum pump;

[0028] One end of the first pipe is connected to the air outlet channel, and the other end of the first pipe is connected to the vacuum pump. In this way, it is convenient to evacuate the sealed cavity formed by the shell, the top cover and the base.

[0029] In some embodiments, the air tightness detection device further includes a first valve, which is disposed on the vacuum pump, and one end of the first pipe away from the air outlet channel is connected to the first valve.

[0030] In some embodiments, the air tightness detection device further includes a second pipe, a pressure gauge and a second valve, one end of the second pipe is connected to the air inlet channel, and the other end of the second pipe is connected to the gas tank;

[0031] The pressure gauge and the second valve are sequentially arranged in the second pipeline along the air flow direction in the second pipeline. In this way, the pressure of the gas sprayed from the gas tank can be conveniently observed through the pressure gauge.

[0032] In some embodiments, the air tightness detection device further comprises a pressure regulator, which is disposed in the second pipeline and is located downstream of the second valve along the air flow direction. In this way, the jet pressure can be conveniently adjusted through the pressure regulator.

[0033] In some embodiments, the surface of the inner mold core and the surface of the side plate are both provided with a plastic layer. In this way, when the outer shell is being tested, the outer shell can be less likely to collide and rub with the surface of the inner mold core and the surface of the side plate, thereby reducing the appearance of the outer shell.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of a housing provided in some embodiments of the present application;

[0037] Figure 2 A schematic diagram of the structure of an airtightness detection device provided in some embodiments of the present application;

[0038] Figure 3 A schematic diagram of the structure of a box provided in some embodiments of the present application;

[0039] Figure 4 A schematic diagram of the matching structure of the box body and the inner mold core provided in some embodiments of the present application;

[0040] Figure 5 A schematic diagram of the inner mold core structure provided in some embodiments of the present application;

[0041] Figure 6Schematic diagram of side panels provided for some embodiments of the present application.

[0042] The reference numerals in the specific implementation manner are as follows:

[0043] 10. Shell; 101. Weld; 11. Box; 111. Top cover; 1111. Air inlet channel; 1112. First groove; 112. Side panel; 1121. First outer mold; 11211. Protrusion; 1122. Second outer mold; 11221. Second groove; 113. Base; 1131. Air outlet channel; 12. Inner mold core; 121. Airway; 1211. First channel; 1212. Second channel; 122. Opening groove; 123. Trapezoidal portion; 13. Gas tank; 14. Second pipeline; 15. Detector; 16. First pipeline; 17. Vacuum pump; 18. First valve; 19. Sealing ring; 20. Fastener; 21. Driving member; 22. Pressure gauge; 23. Second valve; 24. Pressure regulator. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have now become mainstream. In the production process of lithium batteries, the lithium battery casing is a very important process in the battery production process.

[0053] At present, most shells are made of aluminum. Due to the low pressure resistance and melting point of the aluminum shell itself, the aluminum shell will crack and melt during use. In order to solve the above problems, a steel shell with a weld is designed. The steel shell itself has a high melting point and strong strength, which can meet the use requirements. However, before the steel shell is used, the sealing of the weld needs to be tested.

[0054] When used, the detection device in the related art cannot perform targeted detection on the weld position on the steel shell.

[0055] Based on the above considerations, in order to solve the problem that the detection device cannot perform targeted detection on the weld position on the steel shell when in use, an airtightness detection device is designed, including: a gas tank, a box body, an inner mold core and a detector, wherein the box body is provided with a accommodating cavity, an air inlet channel and an air outlet channel are arranged on the box body, the air inlet channel is connected with the gas tank, the inner mold core is arranged in the accommodating cavity, an airway is arranged inside the inner mold core, an open groove is arranged on one side of the inner mold core along the height direction of the box body, the position of the open groove corresponds to the position of the weld on the outer shell, and the air inlet channel, the air outlet channel and the open groove are respectively connected with the airway; under the condition that the outer shell is sleeved on the inner mold core, the two sides of the outer shell along the height direction are sealed with the two sides of the box body along the height direction, and the detector is connected with the air outlet channel.

[0056] When in use, after the outer shell is sleeved on the inner mold core, the two sides of the outer shell along the height direction are sealed with the two sides of the box body along the height direction, and the outer shell and the box body form a sealed cavity, and the inner mold core is located in the formed sealed cavity. At this time, the gas tank sprays into the airway through the air inlet channel, and the sprayed gas is located in the sealed cavity. After the pressure is maintained for a preset time, the leakage rate in the sealed cavity is detected by the detector, so that the sealing of the weld on the outer shell can be detected. Since the position of the opening groove on the inner mold core corresponds to the position of the weld on the outer shell, and the opening groove is connected to the airway, the gas sprayed from the gas tank will quickly flow to the opening groove after passing through the air inlet channel and the airway, and then spray to the weld. In this way, the weld position can be targeted. At the same time, since the inner mold core is located in the sealed cavity, in this way, under the condition that the inner mold core occupies the volume in the sealed cavity, the amount of gas used in the sealed cavity can be reduced, thereby reducing the testing cost.

[0057] According to some embodiments of the present application, Figure 1 It is a schematic diagram of the structure of the shell in this application. Figure 2 Schematic diagram of the structure of the airtightness detection device in this application. Figure 1 Combined with Figure 2As shown, the present application provides an airtightness detection device, including: a box body 11, an inner mold core 12, a gas tank 13 and a detector 15, wherein the box body 11 has a accommodating cavity, an air inlet channel 1111 and an air outlet channel 1131 are arranged on the box body 11, the air inlet channel 1111 is connected with the gas tank 13, the inner mold core 12 is arranged in the accommodating cavity, an air channel 121 is arranged inside the inner mold core 12, the inner mold core 12 is provided with an opening groove 122, the air inlet channel 1111, the air outlet channel 1131 and the opening groove 122 are respectively connected with the air channel 121; under the condition that the outer shell 10 is sleeved on the inner mold core 12, the two sides of the outer shell 10 along the height direction are sealed with the two sides of the box body 11 along the height direction; the detector 15 is connected with the air outlet channel 1131; along one side of the height direction of the box body 11, the opening groove 122 is arranged toward the weld 101 on the outer shell 10.

[0058] The box body 11 in this embodiment is a sealed structure as a whole, and the box body 11 includes but is not limited to a main body and an upper cover. The upper cover is detachably connected to the main body, and the upper cover and the main body are enclosed to form a sealed structure. The box body 11 can be a rectangular parallelepiped, a cylinder, etc., and the specific shape can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0059] In this embodiment, a plurality of air passages 121 may be provided on the inner mold core 12, and the inner mold core 12 as a whole may be a square structure, a cylindrical structure, etc. The specific structure may be determined according to actual conditions, and this specification does not limit this.

[0060] The gas tank 13 in this embodiment may store helium, nitrogen, etc. When the gas tank 13 stores helium, the detector 15 is a helium detector. For the convenience of description, the following description is based on the example that the gas tank 13 stores helium.

[0061] refer to Figure 1 The housing 10 in the embodiment shown is formed by welding steel plates end to end, a weld 101 is formed on one side of the housing 10 in the height direction, and both the upper and lower sides of the housing 10 are open structures.

[0062] When in use, after the outer shell 10 is sleeved on the inner mold core 12, the two sides of the outer shell 10 along the height direction are sealed with the two sides of the box body 11 along the height direction. At this time, the outer shell 10 and the box body 11 are surrounded to form a sealed cavity, and the inner mold core 12 is located in the formed sealed cavity. At the same time, the position of the opening groove 122 on the inner mold core 12 is directly opposite to the position of the weld 101. Then, the gas tank 13 sprays air into the airway 121 through the air inlet channel 1111, and the sprayed gas is located in the sealed cavity. After the pressure is maintained for a preset time, the leakage rate in the sealed cavity is detected by the detector 15, so that the sealing of the weld 101 on the outer shell 10 can be detected. For example: the gas tank 13 sprays air into the airway 121 through the air inlet channel 1111 at a pressure of 80KPa to 120KPa), maintains the pressure for 5 seconds to 8 seconds, and then uses the detector 15 to detect leaks to determine whether the leak rate is less than 1*10^-7Pa*m³ / s. If the leak rate is less than 1*10^-7Pa*m³ / s, the sealing of the weld 101 on the shell 10 is determined to be qualified, otherwise it is determined to be unqualified.

[0063] In the technical solution of the embodiment of the present application, after the outer shell 10 is sleeved on the inner mold core 12, the two sides of the outer shell 10 along the height direction are sealed with the two sides of the box body 11 along the height direction, and the outer shell 10 and the box body 11 are enclosed to form a sealed cavity, and the inner mold core 12 is located in the formed sealed cavity. At this time, the gas tank 13 sprays into the gas channel 121 through the air inlet channel 1111, and the sprayed gas is located in the sealed cavity. After the pressure is maintained for a preset time, the leakage rate in the sealed cavity is detected by the detector 15, so that the sealing of the weld 101 on the outer shell 10 can be detected. Since the open groove 122 on the inner mold core 12 is arranged toward the weld 101 on the outer shell 10, the open groove 122 is connected with the gas channel 121, so that the gas sprayed from the gas tank 13 will quickly flow to the open groove 122 after passing through the air inlet channel 1111 and the gas channel 121, and then spray to the weld 101, so that the position of the weld 101 can be targeted. Detection. At the same time, since the inner mold core 12 is located in the sealed cavity, under the condition that the inner mold core 12 occupies the volume of the sealed cavity, the usage of gas in the sealed cavity can be reduced, thereby reducing the testing cost.

[0064] According to some embodiments of the present application, Figure 3 As shown, the air channel 121 includes a first channel 1211 and a second channel 1212 , the first channel 1211 and the second channel 1212 intersect each other, one end of the first channel 1211 is connected to the air inlet channel 1111 , and the other end is connected to the air outlet channel 1131 , and the second channel 1212 is connected to the opening groove 122 .

[0065] The air channel 121 of this embodiment may include but is not limited to two first channels 1211 and one second channel 1212, wherein the two first channels 1211 extend in the vertical direction, the second channel 1212 extends in the horizontal direction, and each first channel 1211 is connected to the second channel 1212. At the same time, one end of the second channel 1212 is a closed structure, and the other end of the second channel 1212 is connected to the open slot 122.

[0066] When the gas sprayed from the gas tank 13 passes through the air intake channel 1111 and the first channel 1211, it can only enter the second channel 1212. Since one end of the second channel 1212 is closed and the other end is connected to the opening groove 122, and the position of the opening groove 122 is opposite to the position of the weld 101, at this time, the gas can be directly sprayed to the weld 101 after passing through the second channel 1212 and the opening groove 122, thereby realizing targeted detection of the position of the weld 101.

[0067] According to some embodiments of the present application, Figure 3 Combined with Figure 4 As shown, the box body 11 includes a top cover 111, a side panel 112 and a base 113, wherein the top cover 111, the side panel 112 and the base 113 are connected and arranged to form a accommodating cavity; the air inlet channel 1111 is arranged on the top cover 111, and the air outlet channel 1131 is arranged on the base 113; when the outer shell 10 is sleeved on the inner mold core 12, the two sides of the outer shell 10 along the height direction are correspondingly sealed with the top cover 111 and the base 113.

[0068] In this embodiment, the side plate 112 is a square or circular structure as a whole, the upper and lower sides of the side plate 112 are both open structures, the inside of the side plate 112 is a hollow structure, the top cover 111 is buckled on the top of the side plate 112, and the base 113 is arranged at the bottom of the side plate 112. The top cover 111, the side plate 112 and the base 113 are enclosed together to form a sealed accommodating cavity.

[0069] When in use, after the side panel 112 and the base 113 are fixed, the inner mold core 12 is placed inside the side panel 112, and then the outer shell 10 is placed on the inner mold core 12, and finally the top cover 111 is snapped onto the side panel 112. At this time, the top of the outer shell 10 abuts against the top cover 111, and the bottom of the outer shell 10 abuts against the base 113. The outer shell 10, the top cover 111 and the base 113 are arranged to form a sealed cavity, and the inner mold core 12 is located in the formed sealed cavity.

[0070] The gas tank 13 sprays gas into the gas channel 121 through the air inlet channel 1111 on the top cover 111. The sprayed gas is located in the sealed cavity. After the pressure is maintained for a preset time, the leakage rate in the sealed cavity is detected by the detector 15, so that the sealing of the weld 101 on the shell 10 can be detected.

[0071] In this embodiment, since the box body 11 can be disassembled into the top cover 111, the side panels 112 and the base 113, it is convenient to open the top cover 111 on the box body 11 so as to place the inner mold core 12 and the outer shell 10 into the box body 11.

[0072] It should be noted that the above-mentioned box structure is only an example. In other alternative solutions, other structures may also be adopted. For example, the box includes an upper cover and a body, and the upper cover is buckled on the body. This application does not impose any special restrictions on the specific structure of the box, as long as the above-mentioned structure can achieve the purpose of this application.

[0073] According to some embodiments of the present application, Figure 3 Combined with Figure 5 As shown, a first groove 1112 is provided on the side of the top cover 111 facing the base 113, and the air inlet channel 1111 is connected to the first groove 1112; a trapezoidal portion 123 is provided on the side of the inner mold core 12 facing the top cover 111; the opening groove 122 is connected to the trapezoidal portion 123; under the condition that the top cover 111 is set on the side plate 112, the trapezoidal portion 123 is located in the first groove 1112, and the trapezoidal portion 123 is in contact with the top cover 111 on the side facing the top cover 111.

[0074] In this embodiment, when the trapezoidal portion 123 is located in the first groove 1112 , there is a gap between the inclined surface of the trapezoidal portion 123 and the inner wall of the first groove 1112 .

[0075] When in use, the inner mold core 12 is located in the sealed cavity formed by the housing 10, the top cover 111 and the base 113. At this time, when the air inlet channel 1111 is connected with the first groove 1112 and the trapezoidal portion 123 is connected with the open groove 122, the gas ejected from the gas tank 13 will pass through the air inlet channel 1111, the first groove 1112 and the inclined surface of the trapezoidal portion 123 and then quickly flow to the open groove 122, and finally spray to the weld 101.

[0076] According to some embodiments of the present application, Figure 3 Combined with Figure 6 As shown, the side panel 112 includes a first outer mold 1121 and a second outer mold 1122, wherein the top cover 111 abuts against the first outer mold 1121 and the second outer mold 1122 on one side along the height direction, and the base 113 abuts against the first outer mold 1121 and the second outer mold 1122 on the other side along the height direction; the top cover 111, the first outer mold 1121, the second outer mold 1122 and the base 113 together enclose a accommodating cavity.

[0077] In this embodiment, the first outer mold 1121 and the second outer mold 1122 are buckled to form a circular structure or a square structure. After the first outer mold 1121 and the second outer mold 1122 are buckled, the interior thereof is a hollow structure, and the upper and lower sides are open structures. The top cover 111 is arranged on the upper side of the first outer mold 1121 and the second outer mold 1122, and the base 113 is arranged on the lower side of the first outer mold 1121 and the second outer mold 1122.

[0078] Since the side panel 112 can be disassembled into two parts, when placing the outer shell 10, the inner mold core 12 can be fixed to the base 113 first, and then the outer shell 10 can be put on the inner mold core 12, and then the first outer mold 1121 and the second outer mold 1122 can be installed, so as to avoid collision between the outer shell 10 and the first outer mold 1121 and the second outer mold 1122.

[0079] According to some embodiments of the present application, Figure 3 As shown, a protrusion 11211 is provided on a side of the first outer mold 1121 facing the second outer mold 1122 , and a second groove 11221 is provided on a side of the second outer mold 1122 facing the first outer mold 1121 , and the protrusion 11211 cooperates with the second groove 11221 .

[0080] In this embodiment, a protrusion 11211 and / or a second groove 11221 can be set on the first outer mold 1121, or a second groove 11221 and / or a protrusion 11211 can be set on the second outer mold 1122. The specific details can be determined according to actual conditions, and the embodiments of this specification are not limited to this.

[0081] Since a protrusion 11211 is provided on the side of the first outer mold 1121 facing the second outer mold 1122, and a second groove 11221 is provided on the side of the second outer mold 1122 facing the first outer mold 1121, when the first outer mold 1121 is snapped onto the second outer mold 1122, the protrusion 11211 extends into the second groove 11221, thereby ensuring the sealing of the connection between the first outer mold 1121 and the second outer mold 1122.

[0082] According to some embodiments of the present application, Figure 3 As shown, the air tightness detection device further includes a sealing ring 19 , which is disposed on a side of the base 113 facing the side plate 112 ; and a side of the side plate 112 facing the base 113 abuts against the sealing ring 19 .

[0083] The sealing ring 19 in this embodiment can be a nitrile rubber sealing ring, a fluororubber sealing ring, etc. The specific sealing ring can be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0084] When in use, when the side plate 112 is fixed on the base 113 , the side plate 112 abuts against the sealing ring 19 , so that the sealing between the side plate 112 and the base 113 can be ensured.

[0085] According to some embodiments of the present application, the air tightness detection device further includes an elastic member, which is disposed on a side of the inner mold core 12 facing the base 113 , and the elastic member abuts against the sealing ring 19 .

[0086] In this embodiment, the elastic part may refer to a part that can be deformed under the action of an external force and return to its original shape after the external force is removed. The elastic part can be elastically compressed in the vertical direction. The elastic part can be made of metal or non-metallic material, such as: leaf spring, coil spring, gas spring, rubber spring, etc. The specific material can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0087] The elastic member in this embodiment can be integrally formed with the inner mold core 12, or the elastic member can be connected to the inner mold core 12 by bolts. The specific method can be determined according to actual conditions, and this specification does not limit this.

[0088] When in use, after the inner mold core 12 is fixed on the base 113 , the elastic member on the inner mold core 12 abuts against the sealing ring 19 . At this time, the elastic member is compressed to press the sealing ring 19 , thereby reducing the gap between the sealing ring 19 and the base 113 .

[0089] Since the sealing ring 19 itself is located between the side plate 112 and the base 113 , when the gap between the sealing ring 19 and the base 113 is reduced, the sealing between the side plate 112 and the base 113 can be further improved.

[0090] According to some embodiments of the present application, the air tightness detection device further includes a driving member 21 , and the driving member 21 is disposed on a side of the top cover 111 facing away from the side plate 112 .

[0091] In this embodiment, the driving member 21 may be a cylinder, an electric telescopic rod, etc., and the specific driving member 21 may be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0092] When the top cover 111 is buckled onto the side plate 112 , the top cover 111 is pressed by the driving member 21 , so that the top cover 111 can be tightly buckled onto the side plate 112 , thereby avoiding a gap between the top cover 111 and the side plate 112 .

[0093] According to some embodiments of the present application, the airtightness detection device further includes a fastener 20, which is disposed between the inner mold core 12 and the base 113 and is used to fix the inner mold core 12 to the base 113. In this way, the inner mold core can be stably located on the base.

[0094] The fastener 20 in this embodiment can be a bolt, a pin, etc. The specific one can be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0095] When in use, the inner mold core 12 is fixed to the base 113 by the fastener 20, so as to avoid shaking of the inner mold core 12 during testing.

[0096] According to some embodiments of the present application, Figure 2 As shown, the air tightness detection device further includes a first pipe 16 and a vacuum pump 17 , wherein one end of the first pipe 16 is connected to the air outlet channel 1131 , and the other end of the first pipe 16 is connected to the vacuum pump 17 .

[0097] In this embodiment, the first pipeline 16 is also connected to the detector 15. Of course, it can be understood that the detector 15 can also be connected to the air outlet channel 1131 through a separate pipeline. The specific details can be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0098] Before testing, the vacuum pump 17 is first started to evacuate the sealed cavity formed by the housing 10, the top cover 111 and the base 113, and the test is then performed when the pressure in the sealed cavity is 40Pa-50Pa.

[0099] According to some embodiments of the present application, Figure 2 As shown, the air tightness detection device further includes a first valve 18 , which is disposed on the vacuum pump 17 , and one end of the first pipe 16 away from the air outlet channel 1131 is connected to the first valve 18 .

[0100] The first valve 18 in this embodiment can be a negative pressure solenoid valve, a manual valve, etc. The specific valve can be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0101] When in use, a first valve 18 is provided on the first pipeline 16 and the vacuum pump 17 to facilitate blocking the first pipeline 16 .

[0102] According to some embodiments of the present application, Figure 2 As shown, the air tightness detection device also includes a second pipe 14, a pressure gauge 22 and a second valve 23, wherein one end of the second pipe 14 is connected to the air inlet channel 1111, and the other end of the second pipe 14 is connected to the gas tank 13; the pressure gauge 22 and the second valve 23 are sequentially arranged in the second pipe 14 along the air flow direction in the second pipe 14.

[0103] The airflow direction in this embodiment is as follows Figure 2 The pressure gauge 22 and the second valve 23 are arranged on the second pipeline 14 from right to left. In this way, the pressure of the gas sprayed from the gas tank 13 can be easily observed through the pressure gauge 22.

[0104] According to some embodiments of the present application, Figure 2 As shown, the air tightness detection device further includes a pressure regulator 24, which is disposed in the second pipeline 14, and the pressure regulator 24 is located downstream of the second valve 23 along the air flow direction.

[0105] The airflow direction in this embodiment can be referred to the above description and will not be repeated here.

[0106] During use, when the pressure sprayed from the gas tank 13 is less than the set value, the pressure regulating gauge 24 is adjusted to adjust the pressure so that the pressure sprayed from the gas tank 13 reaches the set value.

[0107] According to some embodiments of the present application, a plastic layer is provided on the surface of the inner mold core 12 and the surface of the side plate 112 .

[0108] The plastic layer in this embodiment can be PEEK (polyetheretherketone), resin, etc. The specific plastic layer can be determined according to actual conditions, and this specification embodiment does not limit this.

[0109] When the shell 10 is being tested, since the surface of the inner mold core 12 and the surface of the side panel 112 are covered with a plastic layer, the collision and friction between the shell 10 and the surface of the inner mold core 12 and the surface of the side panel 112 can be reduced, which may affect the appearance of the shell 10.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An airtightness detection device, characterized in that: include: Gas tank, A box body, wherein the box body has a containing cavity, and the box body is provided with an air inlet channel and an air outlet channel, wherein the air inlet channel is connected to the gas tank; An inner mold core, the inner mold core is arranged in the accommodating cavity, an air passage is arranged inside the inner mold core, the inner mold core is provided with an open groove, and the air inlet passage, the air outlet passage and the open groove are respectively communicated with the air passage; Under the condition that the outer shell is sleeved on the inner mold core, the two sides of the outer shell along the height direction are sealed with the two sides of the box body along the height direction; A detector, the detector being communicated with the air outlet passage; Along one side of the box body in the height direction, the opening groove is arranged toward the welding seam on the shell.

2. The airtightness detection device according to claim 1, characterized in that: The air passage includes a first channel and a second channel, the first channel and the second channel intersect, one end of the first channel is communicated with the air inlet channel, the other end of the first channel is communicated with the air outlet channel, and the second channel is communicated with the opening groove.

3. The airtightness detection device according to claim 1 or 2, characterized in that: The box body comprises a top cover, a side plate and a base, wherein the top cover, the side plate and the base are connected and arranged to form the accommodating cavity; The air inlet channel is arranged on the top cover, and the air outlet channel is arranged on the base; Under the condition that the outer shell is sleeved on the inner mold core, the outer shell is sealed with the top cover and the base at two sides along the height direction.

4. The airtightness detection device according to claim 3, characterized in that: A first groove is provided on one side of the top cover facing the base, and the air inlet channel is communicated with the first groove; A trapezoidal portion is provided on one side of the inner mold core facing the top cover; the opening groove is connected to the trapezoidal portion; Under the condition that the top cover is arranged on the side plate, the trapezoidal portion is located in the first groove, and the side of the trapezoidal portion facing the top cover abuts against the top cover.

5. The airtightness detection device according to claim 3, characterized in that: The side plate includes a first outer mold and a second outer mold, the top cover abuts against one side of the first outer mold and the second outer mold along the height direction, and the base abuts against the other side of the first outer mold and the second outer mold along the height direction; The top cover, the first outer mold, the second outer mold and the base together enclose the accommodating cavity.

6. The airtightness detection device according to claim 5, characterized in that: A protrusion is provided on a side of the first outer mold facing the second outer mold, and a second groove is provided on a side of the second outer mold facing the first outer mold, and the protrusion cooperates with the second groove.

7. The airtightness detection device according to any one of claims 4 to 6, characterized in that: The air tightness detection device further comprises a sealing ring, which is arranged on a side of the base facing the side plate; a side of the side plate facing the base abuts against the sealing ring.

8. The airtightness detection device according to claim 7, characterized in that: The air tightness detection device further comprises an elastic member, which is arranged on a side of the inner mold core facing the base, and the elastic member abuts against the sealing ring.

9. The airtightness detection device according to claim 3, characterized in that: The air tightness detection device further comprises a driving member, and the driving member is arranged on a side of the top cover away from the side plate.

10. The airtightness detection device according to claim 3, characterized in that: The air tightness detection device also includes a fastener, which is arranged between the inner mold core and the base and is used to fix the inner mold core to the base.

11. The airtightness detection device according to claim 3, characterized in that: The air tightness detection device also includes a first pipeline and a vacuum pump; One end of the first pipeline is communicated with the air outlet channel, and the other end of the first pipeline is communicated with the vacuum pump.

12. The airtightness detection device according to claim 11, characterized in that: The air tightness detection device further includes a first valve, which is arranged on the vacuum pump, and one end of the first pipeline away from the air outlet channel is connected to the first valve.

13. The airtightness detection device according to claim 3, characterized in that: The air tightness detection device further includes a second pipe, a pressure gauge and a second valve, one end of the second pipe is connected to the air inlet channel, and the other end of the second pipe is connected to the gas tank; The pressure gauge and the second valve are sequentially arranged in the second pipeline along the air flow direction in the second pipeline.

14. The airtightness detection device according to claim 13, characterized in that: The air tightness detection device also includes a pressure regulator, which is arranged in the second pipeline and located downstream of the second valve along the air flow direction.

15. The airtightness detection device according to claim 3, characterized in that: The surface of the inner mold core and the surface of the side plate are both provided with a plastic layer.

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