Air tightness detection device for battery shell

Abstract

The invention provides a battery shell air tightness detection device which comprises an air exhaust part, a detection mechanism, a feeding mechanism and a mounting table, the feeding mechanism and the detection mechanism are arranged on the mounting table, the feeding mechanism is used for feeding the detection mechanism, and the detection mechanism is used for mounting a battery shell and performing air tightness detection on the battery shell; the detection mechanism is provided with a circulation channel, and the circulation channel is communicated with the interior of the battery shell to form a sealed pressure measurement space; the air extracting piece is used for extracting air in the pressure measuring space so that negative pressure can be formed in the pressure measuring space. The battery shell is installed on the detection mechanism, meanwhile, the detection mechanism is provided with a channel communicated with the interior of the battery shell and the air exhaust part, the air exhaust part exhausts air in the battery shell so that negative pressure can be formed in the battery shell, and a detector is arranged in the air exhaust part and can detect the size of the negative pressure in the battery shell. Whether the battery shell leaks air can be judged, manual plugging is not needed, the detection precision is high, the operation is simple, and the working efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of battery casing detection, and in particular to a battery casing air tightness detection device. Background Art

[0002] The airtightness of the lithium battery shell plays a key role in the subsequent use of products. If the airtightness of the battery shell is not good, the internal liquid of the battery will leak out during the subsequent use of the lithium battery, affecting the safety of use.

[0003] In the prior art, most of the air tightness detection steps of battery shells are placed after the shell is formed. The air tightness detection is achieved by sealing the circuit through holes or water inlets and outlets on the battery shell and detecting whether there is leakage inside the shell. However, this detection method has many factors affecting the air tightness, including whether the sealing port is tightly sealed and whether the cover of the battery shell is tightly welded. Therefore, there are many interference factors in the detection results, and it is impossible to accurately identify the specific leakage point.

[0004] In addition, the existing technology needs to be blocked manually, and only one can be blocked at a time, the work efficiency is extremely low, and the operation is relatively cumbersome.

[0005] Therefore, the airtightness detection of the battery casing in the prior art has room for further improvement. Summary of the invention

[0006] In view of this, in order to solve the technical problems in the above-mentioned prior art that the air tightness detection of the lithium battery shell requires manual sealing, the work efficiency is low and the operation is cumbersome, the present application provides a battery shell air tightness detection device, which is provided with a detection mechanism and a feeding mechanism, the battery shell is installed on the detection mechanism, the detection mechanism and the inside of the battery shell form a pressure measuring space, and can detect the pressure value of the pressure measuring space to determine whether the battery shell is leaking, the feeding mechanism realizes automatic feeding of the detection mechanism, it does not require manual sealing and feeding, has high detection accuracy and simple operation, and high work efficiency.

[0007] The present application provides a battery housing air tightness detection device, comprising: A testing mechanism, used to install the battery housing for air tightness testing; Wherein, the detection mechanism is provided with a circulation channel, and the circulation channel is communicated with the interior of the battery housing to form a sealed pressure measurement space; A loading mechanism, used for loading and unloading the testing mechanism; An air extraction member, used for extracting air from the pressure measuring space to form a negative pressure in the pressure measuring space; The mounting table is used to mount the detection mechanism and the feeding mechanism.

[0008] Compared with the prior art, the present application provides a battery shell air tightness detection device, which is provided with a detection mechanism, an exhaust member and a feeding mechanism. The detection mechanism is provided with a flow channel. After the battery shell is installed on the detection mechanism, the flow channel and the battery shell form a sealed pressure measuring space. The exhaust member is connected to the pressure measuring space, and the exhaust member can extract the air in the pressure measuring space, so that the pressure measuring space forms a negative pressure. The detection mechanism includes a detection member, and the detection member can measure the negative pressure value in the pressure measuring space, so as to determine whether the pressure measuring space is leaking. Since the pressure measuring space is formed by the battery shell and the detection mechanism being sealed together, if the pressure measuring space leaks, it means that the battery shell is leaking, so the air tightness of the battery shell can be detected; in the present application, the feeding mechanism can automatically load the detection mechanism, so that the detection device can realize automatic detection of the air tightness of the battery shell, without the need for manual blocking, and the number of installation stations of the detection mechanism can be set according to actual use requirements, and air tightness detection of multiple battery shells can be realized at the same time, reducing the difficulty of operation and improving the detection efficiency.

[0009] Preferably, the detection mechanism comprises a mounting block and a mounting base, the battery housing is sleeved on the mounting block, and the mounting block is sealingly arranged on the mounting base; The circulation channel includes a first gas channel and a second gas channel, the first gas channel is arranged on the mounting block, and the second gas channel is arranged on the mounting base; The second gas channel is connected to the interior of the battery housing through the first gas channel, and one end of the second gas channel away from the first gas channel is connected to the gas extraction member.

[0010] Preferably, it further comprises an oil scraping mechanism, wherein the oil scraping mechanism is arranged on the mounting platform; The oil scraping mechanism comprises an oil scraping assembly and a feeding drive assembly, and the feeding drive assembly is used to drive the oil scraping assembly to move parallel to the side of the mounting block to scrape off the lubricating oil on the periphery of the mounting block.

[0011] Preferably, the detection mechanism further comprises a sealing ring, and the sealing ring is sleeved at the connection between the mounting block and the mounting base; The mounting block is provided with a sealing groove, the sealing ring is at least partially located in the sealing groove and at least partially located at the bottom of the battery housing, and the sealing ring is used to seal the battery housing, the mounting block and the mounting base.

[0012] Preferably, the first gas channel is divided into a first channel and a second channel, and the second channel is arranged on both sides of the first channel; The first channel is connected to the interior of the battery housing through the second channel, and one end of the first channel away from the second channel is connected to the air extraction member; Wherein, in the vertical direction, the end of the second channel connected to the battery housing is lower than the end connected to the first channel and higher than the bottom of the battery housing.

[0013] Preferably, the second gas channel includes a third channel and a fourth channel, the third channel is arranged in a vertical direction, and the fourth channel is arranged perpendicular to the third channel; The third channel is used to connect the fourth channel with the mounting block, and the fourth channel is used to connect the third channel with the air extraction member.

[0014] Preferably, the mounting block is provided with a mounting through hole, and the mounting through hole passes through the mounting block in a vertical direction; The mounting bottom plate is provided with a limiting blind hole, and the mounting through hole and the limiting blind hole are used for inserting the same connecting piece; A pressure relief groove is provided on the outer side surface of the installation block, and the pressure relief groove is recessed toward the center direction of the installation block.

[0015] Preferably, the detection mechanism further comprises a detection member, an air inlet valve and a pressure extraction valve, and the pressure extraction valve comprises at least three joints, and the three joints are respectively connected to the air extraction member, the air inlet valve and the mounting base; The pressure extraction valve is used to control the communication between the pressure measuring space and the air extraction member, and the air inlet valve is used to control the communication between the external air and the pressure measuring space; The detection element is used to detect the pressure value in the pressure measuring space.

[0016] Preferably, the feeding mechanism comprises a feeding claw and a feeding drive assembly, and the feeding claw is connected to the feeding drive assembly; The loading gripper is used to grab the battery housing onto the detection mechanism, and the loading drive assembly is used to drive the loading gripper to and fro between the placing station and the installation station.

[0017] Preferably, the feeding gripper comprises a suction cup and a buffer pad, and the buffer pad is provided with a mounting hole for mounting the suction cup; The suction cup is used to absorb the battery housing, and the buffer pad is used to provide elastic buffering force to the battery housing; Wherein, the hardness of the buffer pad is 70-80A.

[0018] Preferably, the feeding drive assembly includes a feeding drive member and a guide rail, the guide rail is arranged parallel to the side of the mounting block, the guide rail is slidably connected to the oil scraper assembly, and the feeding drive assembly is used to drive the oil scraper assembly to move along the guide rail.

[0019] Preferably, the oil scraper assembly includes a mounting bracket and an oil scraper member, the mounting bracket is connected to the feeding drive assembly, and the oil scraper member is fixedly connected to the mounting bracket.

[0020] Preferably, the bottom of the oil scraper is in contact with the upper end surface of the sealing ring, and the end surface of the oil scraper close to the mounting block is in contact with the mounting block.

[0021] Preferably, the oil scraping assembly comprises at least two first mounting brackets, and the two first mounting brackets are arranged in parallel and spaced apart on opposite sides of the mounting block; The feeding drive assembly includes a first feeding drive member and a first guide rail, the first guide rail is arranged in parallel at the bottom of the first mounting bracket, and the first feeding drive member is connected to the first mounting bracket.

[0022] Preferably, the oil scraping assembly comprises at least two second mounting brackets, and the two second mounting brackets are arranged in parallel and spaced apart on opposite sides of the mounting block; The feeding drive assembly comprises a second feeding drive member and a second guide rail, the second guide rail is arranged in parallel at the bottom of the second mounting bracket, and the second feeding drive member is connected to the second mounting bracket; Wherein, the length extension direction of the first guide rail is perpendicular to the length extension direction of the second guide rail.

[0023] Preferably, the oil scraper assembly comprises a first oil scraper and a second oil scraper, the first oil scraper is arranged on the first mounting bracket, and the second oil scraper is arranged on the second oil scraper; The bottoms of the first oil scraper and the second oil scraper are flush with each other.

[0024] Preferably, the mounting block comprises a first side surface and a second side surface, the first side surface is adjacent to and vertically arranged on the second side surface, and the two first side surfaces are arranged in parallel at both ends of the two parallel second side surfaces; Wherein, the driving stroke of the first loading drive member on the first mounting bracket is greater than the length of the first side surface, and the driving stroke of the second loading drive member on the second mounting bracket is greater than the length of the second side surface.

[0025] Preferably, the oil scraper comprises a scraper plate and a mounting support, and the mounting support is arranged on the mounting bracket; The scraper is mounted on the mounting support, and a side of the scraper facing the mounting block at least partially protrudes from the mounting support; Wherein, the scraper is made of soft rubber material.

[0026] Preferably, a mounting groove for mounting a scraper is provided at the bottom of the mounting support, and the length of the scraper is greater than the depth of the mounting groove; The scraper includes a mounting portion and an oil scraping portion, the mounting portion is arranged in the mounting groove, the mounting portion has a width of L1, the oil scraping portion has a width of L2, the mounting groove has a width of L3, and L1>L3≥L2.

[0027] The battery housing air tightness detection device of the present application has at least the following technical effects: 1. By setting a mounting block, a mounting base and a sealing ring, the battery housing is sleeved on the mounting block, and the sealing gasket forms a seal for the installation of the battery housing and the mounting block, so that the inside of the battery housing is connected with the channel for gas circulation on the mounting block and the mounting base, and then the battery housing and the detection mechanism form a sealed pressure measuring space. When the vacuum element evacuates the pressure measuring space, it can convert the pressure measuring space from normal pressure to negative pressure. By measuring whether the negative pressure value changes or not by the detection element, the air tightness of the battery housing can be detected. By directly measuring inside the battery housing, the squeezing effect of the battery housing on the housing when the pressure is pumped out can be reduced, and at the same time, external interference factors can be reduced. The measurement can be performed before the battery housing is covered, which is convenient for controlling the factors affecting the air tightness of the battery housing; 2. By setting a feeding mechanism, the feeding mechanism includes a feeding claw and a feeding drive assembly. The feeding claw can grab the battery shell on the assembly line to the detection device for detection, and the feeding drive assembly can drive the feeding claw to move, thereby realizing flexible picking of the battery shell, reducing the need for manual operation, and improving work efficiency; 3. By setting the second channel of the first gas channel on the mounting block to be inclined, the second channel includes two ends, which are respectively an end connected to the inside of the battery shell and an end connected to the first channel, wherein the height of the end connected to the inside of the battery shell in the vertical direction is lower than the height of the end connected to the first channel, so that the second channel is an inclined structure. When the pressure is pumped, the oil inside the battery shell will not easily enter the first channel through the second channel, which can prevent the oil from entering the air extraction component and avoid affecting the service life of the air extraction component; 4. By setting the air intake valve and the pressure relief valve, the air intake and pressure relief can be controlled separately to avoid interference between the pressure relief and the air intake back pressure; 5. By providing an oil scraping mechanism to scrape off the lubricating oil on the periphery of the mounting block, it is possible to prevent the lubricating oil residue on the battery housing from accumulating on the mounting block, thereby ensuring the installation sealing effect between the battery housing and the mounting block and ensuring the detection accuracy of the airtightness detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery casing air tightness detection device provided in one embodiment of the present application; Figure 2 It is a partial structural schematic diagram of a battery casing air tightness detection device provided in one embodiment of the present application; Figure 3 It is a schematic diagram of a partial cross-sectional structure of a detection mechanism provided in one embodiment of the present application; Figure 4 yes Figure 1 A schematic diagram of a local A enlargement; Figure 5 yes Figure 2 A partial enlarged schematic diagram of B; Figure 6 yes Figure 3 A local C enlarged schematic diagram; Figure 7 It is a schematic diagram of the three-dimensional structure of a mounting base provided in one embodiment of the present application; Figure 8 is a schematic cross-sectional structure diagram of a mounting base provided in an embodiment of the present application; Fig. 9 It is a schematic diagram of the three-dimensional structure of a mounting block provided in one embodiment of the present application; Fig.10 is a schematic cross-sectional structure diagram of a mounting block provided in an embodiment of the present application; Fig.11 It is a schematic diagram of the three-dimensional structure of an oil scraping mechanism provided in an air tightness detection device according to an embodiment of the present application; Fig.12 It is a three-dimensional schematic diagram of the cooperation between the oil scraping mechanism and the mounting block provided in one embodiment of the present application; Fig.13 It is a top view schematic diagram of the cooperation between the oil scraping mechanism and the mounting block provided in one embodiment of the present application; Fig.14 yes Fig.12 A local E enlarged schematic diagram; Fig.15 yes Fig.12 A local enlarged schematic diagram of F; Fig.16 yes Fig.13 A local G enlarged schematic diagram; Fig.17 yes Fig.15 A local H enlarged schematic diagram; Fig.18 It is a schematic diagram of the three-dimensional structure of a mounting bracket provided in one embodiment of the present application.

[0029] Reference numerals: 1. detection mechanism; 2. oil scraping mechanism; 3. feeding mechanism; 4. battery housing; 5. mounting platform; 11. Mounting block; 12. Mounting base; 13. Sealing ring; 14. Inlet valve; 15. Pressure relief valve; 16. Branch joint; 111. First gas channel; 112. Mounting through hole; 113. Sealing groove; 114. Pressure relief groove; 115. First side surface; 116. Second side surface; 1111. First channel; 1112. Second channel; 121. Second gas channel; 122. Position-limiting blind hole; 1211. Third channel; 1212. Fourth channel; 131. Position-limiting convex ring; 21. Oil scraper assembly; 22. Oil scraper drive assembly; 211. First mounting bracket; 212. Second mounting bracket; 213. First oil scraper member; 214. Second oil scraper member; 215. Scraper; 216. Mounting support; 217. First fixed bracket; 218. Second fixed bracket; 2151. Mounting portion; 2152. Oil scraper portion; 2161. Mounting groove; 2162. Top plate; 2163. Side plate; 221. First oil scraper drive member; 222. Second oil scraper drive member; 223. First guide rail; 224. Second guide rail; 31. Loading gripper; 32. Loading drive assembly; 33. Loading bracket; 311. Buffer pad; 312. Connecting base; 313. Sliding rod; 314. Connecting bracket; 315. Suction cup; 321. First loading drive member; 322. Second loading drive member. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0031] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] Those skilled in the art should understand that, in the disclosure of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0033] The present application is further described in detail below in conjunction with the accompanying drawings. Figures 1 to 10 illustrate.

[0034] The present application provides a battery shell air tightness detection device (hereinafter referred to as the detection device), which is used to detect the air tightness of a lithium battery shell 4, and can detect whether cracks are generated in the metal battery shell 4 during stretching. It can be used in any link after the battery shell 4 is formed to perform automated air tightness detection on the battery shell 4, thereby reducing the need for manual operation and improving work efficiency.

[0035] Specifically, Figures 1 to 6 As shown, the detection device includes a mounting platform 5, a detection mechanism 1, an exhaust component and a feeding mechanism 3. The mounting platform 5 is used to install the detection mechanism 1, the exhaust component and the feeding mechanism 3. The detection mechanism 1 is used to install the battery housing 4. A flow channel is provided in the detection mechanism 1. The flow channel and the interior of the battery housing 4 form a sealed pressure measuring space. The detection mechanism 1 can detect the negative pressure value in the pressure measuring space; the exhaust component is connected to the pressure measuring space to create a negative pressure test condition; the feeding mechanism 3 is used to place the battery housing 4 on the detection mechanism 1, or to take the battery housing 4 out of the detection mechanism 1. The three mechanisms cooperate with each other to realize automatic detection of the airtightness of the battery housing 4, with extremely low labor requirements and greatly improved work efficiency.

[0036] Among them, in the detection mechanism 1, if Figure 1 to Figure 2 As shown, the detection mechanism 1 is provided with a plurality of installation stations, each of which corresponds to the installation of a battery housing 4, and each of which corresponds to a loading station, so that the detection device can detect a plurality of battery housings 4 at a time, greatly improving the work efficiency.

[0037] Further, the detection mechanism 1 is described in detail; Figures 3 to 10 As shown, the detection mechanism 1 includes a mounting block 11, a mounting base 12 and a sealing ring 13. The mounting base 12 is arranged on the mounting platform 5, the mounting block 11 is arranged on the mounting base 12, and the sealing ring 13 is sleeved at the connection between the mounting block 11 and the mounting base 12 to achieve sealing between the mounting block 11 and the mounting base 12; specifically, the mounting block 11 is a rectangular block structure, which is basically similar to the structure of the battery housing 4, and is slightly smaller than the battery housing 4, so that the battery housing 4 can be sleeved on the mounting block 11; the mounting base 12 is a rectangular block structure, and its width and length are both greater than the width and length of the mounting block 11; the sealing ring 13 is a rectangular annular structure, which is sleeved on the bottom of the mounting block 11, and its length and width are both greater than the length and width of the mounting block 11, and less than the length and width of the mounting base 12, so as to ensure that the sealing ring 13 and the mounting block 11 can fully fall on the mounting base 12, and ensure the stable connection and sealing of the battery housing 4 by the detection mechanism 1.

[0038] like Figure 3 , Figures 6 to 10As shown, the circulation channel includes a first gas channel 111 and a second gas channel 121, the first gas channel 111 is arranged on the mounting block 11, one end of the first gas channel 111 opens on the side wall of the mounting block 11 and communicates with the inside of the battery housing 4, and the other end opens on the bottom of the mounting block 11; the second gas channel 121 is arranged on the mounting base 12, one end of the second gas channel 121 opens on the upper end surface of the mounting base 12 and communicates with the first gas channel 111, and the other end opens on the side end surface of the mounting base 12 and communicates with the exhaust member; wherein, the first gas channel 111, the second gas channel 121 and the inside of the battery housing 4 together form a sealed pressure measuring space, which does not need to be manually blocked; the battery housing 4 is directly sleeved on the mounting block 11, and can be directly pressure-measured inside the battery housing 4, and the mounting block 11 has a certain supporting effect on the structure of the battery housing 4, which can avoid the battery housing 4 from being squeezed and deformed when negative pressure is generated, and reduce the probability of the battery housing 4 being damaged in the airtightness detection, and the operation is simple, there is no need to worry about problems such as plugging and leakage, which can reduce interference factors in the detection and greatly improve the detection accuracy. The second gas channel 121 is connected to the exhaust member at one end away from the first gas channel 111.

[0039] Further, such as Figure 3 , Figure 6 As shown, the first gas channel 111 is divided into a first channel 1111 and a second channel 1112, the second channel 1112 is symmetrically arranged on both sides of the first channel 1111, the first channel 1111 is arranged in the vertical direction, the lower end of the first channel 1111 opens at the bottom of the mounting block 11, the bottom of the upper end of the first channel 1111 is located at about 4 / 5 of the height of the mounting block 11, the upper end of the first channel 1111 is not provided with a vertical opening on the mounting block 11, but openings communicating with the second channel 1112 are provided at both ends; specifically, the second channel 1112 includes two ports, namely a first port and a second port, the first port opens on the outer side wall of the mounting block 11, and the second port extends inwardly to communicate with the upper end position of the first channel 1111, so that the first channel 1111 can be connected with the inside of the battery housing 4 through the second channel 1112, and then the air inside the battery housing 4 can be sucked away to generate negative pressure.

[0040] In this embodiment, if Figure 3As shown, in the vertical direction, the height of the first port of the second channel 1112 is lower than the second port, so that the second channel 1112 is an inclined structure. If there is oil or other impurities in the battery housing 4, when the vacuum component draws out the air in the pressure measuring space, the gas in the battery housing 4 enters the first channel 1111 through the second channel 1112, and then enters the second gas channel 121 of the mounting base 12. When entering the first channel 1111 from the second channel 1112, impurities such as oil stains will be guided by the downward inclination of the second channel 1112 during the process of climbing from the first port to the second port, and it is difficult to enter the first channel 1111 through the second port, thereby ensuring that impurities and the like are difficult to enter the vacuum component, thereby avoiding affecting the vacuum component.

[0041] Among them, in this embodiment, the height of the first port of the second channel 1112 is higher than the bottom of the mounting block 11, and the first port is located approximately at 2 / 3 of the height of the mounting block 11, so that impurities such as oil and dirt are difficult to enter the first port of the second channel 1112, which can further prevent impurities from entering the vacuum component during pumping, and further ensure the safety of the vacuum component.

[0042] like Figure 3 , Figure 6 , Figures 7 and 8 As shown, the second gas channel 121 includes a third channel 1211 and a fourth channel 1212. The third channel 1211 is arranged in the vertical direction. The upper end of the third channel 1211 opens on the upper end surface of the mounting base 12 and is connected to the first channel 1111, and the lower end of the third channel 1211 is connected to the fourth channel 1212; the fourth channel 1212 is arranged perpendicular to the third channel 1211, one end of the fourth channel 1212 opens on the side wall of the mounting base 12 and is connected to the exhaust member, and the other end extends to the middle position of the mounting base 12 in the horizontal direction, and the part thereof located in the mounting base 12 is provided with an upward opening to be connected to the third channel 1211; thereby, the second gas channel 121 is connected to the first gas channel 111.

[0043] In this embodiment, when the vacuum component is evacuating air, the gas in the battery housing 4 enters the vacuum component through the second channel 1112, the first channel 1111, the third channel 1211, and the fourth channel 1212 in sequence, thereby forming a negative pressure in the pressure measuring space, and realizing airtightness detection through the cooperation of the detection component.

[0044] Among them, Figure 3 , Figure 6 , Figures 9 and 10As shown, an annular sealing groove 113 is provided at the bottom of the mounting block 11, and the sealing groove 113 is recessed inwardly. The sealing groove 113 is used to install the sealing ring 13. The horizontal depth of the sealing groove 113 is less than the horizontal thickness of the sealing groove 113, so that the sealing ring 13 is at least partially located in the sealing groove 113 and partially exposed outside the sealing groove 113, and the exposed part supports the battery housing 4. When the battery housing 4 is sleeved on the mounting block 11, the bottom of the battery housing 4 fits with the top of the exposed part of the sealing ring 13. In addition to forming a seal for the connection between the mounting block 11 and the mounting base 12, the sealing ring 13 also forms a seal for the connection between the battery housing 4 and the mounting block 11, so as to ensure the effective sealing of the pressure measuring space formed by the detection mechanism 1 and the battery housing 4, and to ensure the accuracy of airtightness detection.

[0045] Further, such as Figure 6 As shown, the bottom of the sealing ring 13 fits with the upper end surface of the mounting base 12, and a limiting convex ring 131 is provided at the bottom of the sealing ring 13, and the limiting convex ring 131 is located in the middle position of the sealing ring 13; the limiting convex ring 131 is an annular structure, the limiting convex ring 131 protrudes downward, the cross-section of the limiting convex ring 131 is a hemispherical structure, the limiting convex ring 131 is relatively small, and the limiting convex ring 131 acts between the bottom of the sealing ring 13 and the upper end surface of the mounting base 12. The limiting convex ring 131 can increase the connection stability between the mounting base 12 and the sealing ring 13, increase the friction between the sealing ring 13 and the mounting base 12, and reduce the probability of slippage when the sealing ring 13 and the mounting base 12 are in surface contact, thereby improving the sealing performance of the detection mechanism 1.

[0046] In this embodiment, two limiting protrusions 131 are provided on the sealing ring 13 , and the two limiting protrusions 131 are evenly spaced and distributed to ensure force stability.

[0047] like Figure 5 , Figures 8 to 10 In the embodiment, a mounting through hole 112 is provided on the mounting block 11, and the mounting through hole 112 passes through the mounting block 11 in the vertical direction. The mounting through holes 112 are arranged in two groups, which are symmetrically arranged on both sides of the first gas channel 111, and each group is provided with two; correspondingly, a limiting blind hole 122 is provided on the mounting base plate, and the limiting blind hole 122 is coaxially arranged with the mounting through hole 112. The limiting blind hole 122 is opened on the upper end surface of the mounting base 12, and the bottom of the limiting blind hole 122 is not opened. The mounting through hole 112 and the limiting blind hole 122 are used for the insertion of the same connecting piece, and the connecting piece is inserted into the mounting through hole 112 and the limiting blind hole 122 from top to bottom in sequence, so as to realize the connection between the mounting block 11 and the mounting base 12, and the bottom of the connecting piece does not pass through the mounting base 12, so that all the through channels of the mounting block 11 are controlled above the mounting base 12 and located in the battery housing 4, so as to avoid leakage at the bottom of the mounting base 12 and affect the air tightness detection error of the battery housing 4.

[0048] Among them, Fig.10 As shown, the mounting through hole 112 is divided into a first part and a second part, the first part is located above the second part, and the inner diameter of the first part is larger than the inner diameter of the second part, so that the head of the connecting member (bolt or screw) can be limited in the first part by the second part, avoiding the head of the connecting member protruding to the surface of the mounting block 11 and affecting the installation of the battery housing 4.

[0049] In addition, Figure 3 , Figure 5 , Figures 9 and 10 As shown, a guide surface is provided on the top of the mounting block 11, and the guide surface is an inclined structure, so that the top of the mounting block 11 is a conical structure, and the width and length of the upper end of the mounting block 11 are smaller than the middle and bottom parts, so that when the battery housing 4 is installed from top to bottom, the guide surface can guide the battery housing 4, so that the battery housing 4 can be smoothly installed downward onto the mounting block 11, and at the same time, the initial contact area between the battery housing 4 and the mounting block 11 is reduced, the probability of collision between the two due to incomplete alignment is reduced, the impact on the battery housing 4 is reduced, and the protection of the battery housing 4 is improved.

[0050] Further, such as Figure 7 As shown, the mounting block 11 includes a first side surface 115 and a second side surface 116, the first side surface 115 and the second side surface 116 are arranged adjacent to each other, and the angle between the first side surface 115 and the second side surface 116 is 90°, that is, the first side surface 115 and the second side surface 116 are vertically connected, and there are two first side surfaces 115 and two second side surfaces 116, and the two first side surfaces 115 are arranged in parallel on both sides of the second side surface 116 to form a columnar structure. Among them, a pressure relief groove 114 is provided on the first side surface 115 or the second side surface 116, and the pressure relief groove 114 is arranged in the vertical direction, and the pressure relief groove 114 is recessed toward the center direction of the mounting block 11, and the plurality of pressure relief grooves 114 are arranged at intervals, and the pressure relief groove 114 reduces the fitting area between the first side surface 115 or the second side surface 116 of the mounting block 11 and the battery housing 4, which can reduce the adhesion area of ​​the oil to the battery housing 4 and the mounting block 11, and reduce the oil adsorption force, so that the feeding mechanism 3 can easily remove the battery housing 4 from the mounting block 11.

[0051] In addition, Figure 1 to Figure 2 , Figure 4As shown, the detection mechanism 1 also includes a branch joint 16, an air inlet valve 14 and a pressure extraction valve 15 arranged on the mounting platform 5. The number of the branch joints 16 corresponds to the number of installation stations, that is, each installation station is provided with a branch joint 16; the fourth channel 1212 of the mounting base 12 is provided with an air outlet joint at an opening, and the air outlet joint is connected to the branch joint 16 by a pipeline, and the air outlet end of the air outlet joint is connected to the pressure extraction valve 15 through a pipeline; in this embodiment, the detection component is arranged in the branch joint 16 to detect the pressure value in the pressure measuring space; wherein the pressure extraction valve 15 includes at least three joints, and the three joints are respectively connected to the air extraction component, the air inlet valve 14, and the mounting base 12 through pipelines.

[0052] In this embodiment, the pressure extraction valve 15 is used to control the connection between the pressure measuring space and the air extraction member, that is, when pressure extraction is required, the pressure extraction valve 15 is controlled to open the connection between the air extraction member and the branch joint 16, and at the same time close the connection between the air inlet valve 14 and the pressure measuring space, and the air extraction member extracts pressure from the pressure measuring space. When the pressure measuring space measures the rated value, the connection between the air extraction member and the pressure measuring space is closed, and the pressure of the pressure measuring space is maintained. During the pressure maintenance period, the detection member in the branch joint 16 measures whether the pressure value in the pressure measuring space changes. If it changes, it indicates that there is a probability of leakage in the battery housing 4, and the air tightness of the battery housing 4 may be poor. When the pressure measurement is completed, the pressure measuring space needs to be depressurized so that the loading mechanism 3 can remove the battery housing 4 from the mounting housing; when releasing the pressure, it is necessary to ensure that the connection between the vacuum component and the pressure measuring space is closed, and then the connection between the air intake valve 14 and the pressure measuring space is opened through the pressure extraction valve 15, so that external air can enter the pressure measuring space through the air intake valve 14, and the pressure inside the battery housing 4 is released, so that the inside of the battery housing 4 returns to normal pressure, so that the loading mechanism 3 can easily remove the battery housing 4 from the mounting block 11.

[0053] It should be noted that if Figure 3 , Figure 6 As shown, the inner diameter of the first channel 1111 is larger than that of the second channel 1112, and the inner diameter of the third channel 1211 is smaller than that of the fourth channel 1212. When the pressure is pumped out, the gas flows from the second channel 1112 to the first channel 1111, and the pressure is reduced, thereby reducing the power for impurities such as oil to enter the first channel 1111; the gas flows from the first channel 1111 to the third channel 1211, and the pressure is increased, which can impact the oil impurities and the like entering the first channel 1111 at the bottom of the first channel 1111, thereby reducing the probability of entering the third channel 1211 and the fourth channel 1212; During pressure relief, the gas flows from the third channel 1211 to the first channel 1111, and the pressure decreases, making it more difficult for impurities in the air to enter the second channel 1112 through the first channel 1111; when the gas flows from the first channel 1111 to the second channel 1112, the pressure increases, which speeds up the gas circulation rate, speeds up the pressure relief rate, and improves the detection efficiency.

[0054] In addition, Figure 6 As shown, the lower opening of the third channel 1211 is arranged in the middle of the fourth channel 1212, so that there is a distance between the bottom of the fourth channel 1212 and the opening of the third channel 1211. When the pressure is released, impurities in the air will be rushed into the bottom of the fourth channel 1212, reducing the probability of impurities entering the third channel 1211.

[0055] Furthermore, filters are provided on the air inlet valve 14 and the air extraction member, so that when the pressure is extracted, the air entering the air extraction member can be filtered to prevent impurities from entering the air extraction member; when the pressure is released, the air entering the air inlet valve 14 can be filtered to prevent impurities from entering the pressure measuring space.

[0056] Based on any of the above embodiments, the feeding mechanism 3 is further described; Figure 1 to Figure 2 , Figure 5 As shown, the feeding mechanism 3 includes a feeding bracket 33, a feeding claw 31 and a feeding drive assembly 32. The feeding bracket 33 is an arch structure. Both ends of the feeding bracket 33 are connected to the feeding drive assembly 32. A plurality of feeding claws 31 are connected to the feeding bracket 33, wherein the number of the feeding claws 31 corresponds to the number of installation stations; the feeding drive assembly 32 is used to drive the entire feeding to move on the horizontal plane, so that the feeding claw 31 can move back and forth between the loading station and the installation station. The loading station can be any part of the battery shell 4 production line. The entire detection device is arranged on the side of the production line. The feeding drive assembly 32 drives the feeding claw 31 to move, so that the battery shell 4 can be moved to the detection mechanism 1 for airtightness detection, or the battery shell 4 after detection can be moved to the original station, so that the battery shell 4 can continue to complete subsequent work.

[0057] In this embodiment, if Figure 3As shown, the loading drive assembly 32 includes a driving bracket, a first loading drive member 321, a first slide rail and a first slider, and the driving bracket is fixedly connected to the mounting table 5; the first loading drive member 321 is arranged on the driving bracket, one side of the first slider is slidably connected to the first slide rail, and the other side is fixedly connected to the driving bracket, and the side of the first slide rail away from the first slider is fixedly connected to the loading bracket 33; the first loading drive member 321 is a cylinder or oil cylinder type linear drive member, and the side end of the first loading drive member 321 is fixedly connected to the side end of the first slide rail through a connecting plate, and the first loading drive member 321 drives the first slide rail to slide relative to the driving bracket, thereby realizing the displacement of the loading claw 31 relative to the driving bracket.

[0058] Among them, Figure 3 As shown, the feeding gripper 31 includes a connecting bracket 314, a connecting base 312, a suction cup 315 and a buffer pad 311. The connecting bracket 314 is fixedly connected to the feeding bracket 33. The connecting base 312 is slidably connected to the connecting bracket 314 through a sliding rod 313. The connecting base 312 is fixedly connected to the bottom of the sliding rod 313. The sliding rod 313 is slidably connected to the connecting bracket 314; the buffer pad 311 and the suction cup 315 are fixedly connected to the connecting base 312. The buffer pad 311 is provided with a suction cup 315 passing through. The upper end of the suction cup 315 passes through the buffer pad 311 and is connected to the connecting base 312. The lower end of the suction cup 315 passes through the buffer pad 311 and is located at the lower end of the buffer pad 311. The upper end of the suction cup 315 is connected to the cylinder assembly to generate suction to absorb the battery housing 4. The buffer pad 311 is made of elastic material, and the hardness of the buffer pad 311 is 70-80A. The buffer pad 311 can provide elastic buffering force to the battery housing 4 to prevent the suction cup 315 from colliding with the battery housing 4 due to excessive impact when absorbing the battery housing 4.

[0059] In this embodiment, the hardness of the buffer pad 311 is set to any one of 70A, 71A, 72A, 73A, 74A, 75A, 76A, 77A, 78A, 79A, and 80A; specifically, 75A is preferred.

[0060] Further, such as Figure 3 As shown, the loading drive assembly 32 also includes a second loading drive member 322, which is a driving element such as an oil cylinder or a pneumatic cylinder. The bottom of the second loading drive member 322 is fixedly connected to the upper end of the loading bracket 33, and the second loading drive member 322 is sleeved on the slide bar 313. The second loading drive member 322 drives the slide bar 313 to move up and down by rotation, thereby realizing the displacement drive of the loading claw 31 in the vertical direction, so that the loading claw 31 can grab the battery housing 4 and move it downward to fall onto the mounting block 11, or move it upward to remove the battery housing 4 on the mounting block 11, which greatly improves the flexibility of the loading mechanism 3.

[0061] It should be noted that, in the present application, two rows of installation stations are set, each row has six installation stations, a total of sixteen installation stations, that is, in the present application, the air tightness test of sixteen battery shells 4 can be detected at the same time; correspondingly, the feeding claws 31 are divided into two groups, and the two groups are respectively arranged on both sides of the feeding bracket 33, and the number of feeding claws 31 and branch joints 16 corresponds to the number of installation stations; at the same time, Figure 4 As shown, the branch joints 16 are divided into two groups, which are arranged on the mounting platform 5 in an upper and lower distribution. Each group of branch joints 16 is connected to the pressure relief valve 15 through an eight-way or seven-way joint.

[0062] It should be noted that, in the present application, the vacuum element (not shown in the figure) can be a device such as a vacuum pump or an air extraction pump that can achieve pressure extraction, and the detection element is a sensor device that can achieve pressure detection, which will not be described in detail here.

[0063] On the basis of any of the above embodiments, the battery housing airtightness detection device is further expanded; Figures 11 to 18 As shown, the oil scraping mechanism 2 is arranged on the mounting platform 5, and is used to scrape off the lubricating oil remaining on the battery housing 4 on the airtightness detection device to prevent the oil from accumulating and solidifying on the airtightness detection device, so as to ensure the sealing effect of the airtightness detection device on the battery housing 4 and improve the detection accuracy.

[0064] Specifically, Figures 12 to 16 As shown, the oil scraper mechanism 2 includes an oil scraper assembly 21 and an oil scraper drive assembly 22. The oil scraper drive assembly 22 is arranged on the mounting table 5. The oil scraper assembly 21 is connected to the oil scraper drive assembly 22. The oil scraper drive assembly 22 can drive the oil scraper assembly 21 to move parallel to the first side 115 and the second side 116 of the mounting block 11, so as to scrape off the lubricating oil on the periphery of the mounting block 11.

[0065] Among them, Figures 15 to 17 As shown, the oil scraper drive assembly 22 includes a guide rail and an oil scraper drive member. The bottom of the guide rail is fixedly connected to the mounting table 5, and the guide rail is arranged parallel to the first side 115 and the second side 116 of the mounting block 11; the oil scraper assembly 21 includes a mounting bracket and an oil scraper member. The mounting bracket is slidably connected to the upper end of the guide rail, and the oil scraper drive assembly 22 is fixedly connected to the mounting bracket. The oil scraper drive assembly 22 is used to drive the mounting bracket to move along the guide rail, and the oil scraper member is detachably connected to the mounting bracket. The oil scraper member is arranged on a side of the mounting bracket facing the first side 115 and the second side 116 of the mounting block 11; during the process of the mounting bracket driving the oil scraper member to move along the guide rail, it comes into contact with the first side 115 and the second side 116 of the mounting block 11, and then drives the lubricating oil on the first side 115 and the second side 116 to move until the oil scraper member is out of contact with the first side 115 and the second side 116, and the carried lubricating oil is also out of contact with the first side 115 and the second side 116.

[0066] Specifically, Fig.17 , Fig.18 As shown, the oil scraper includes a scraper 215 and a mounting support 216, and the mounting support 216 includes a top plate 2162 and a side plate 2163. At least one end of the top plate 2162 is connected to the side plate 2163, so that the mounting support 216 is an arch structure or an inverted L-shaped structure; the top plate 2162 of the mounting support 216 is connected to the mounting bracket by screws, and the end of the top plate 2162 is vertically connected to the side plate 2163, and the side plate 2163 extends toward the mounting platform 5; the scraper 215 is arranged on the side plate 2163 of the mounting support 216, and the side of the scraper 215 facing the mounting block 11 at least partially protrudes from the edge of the side plate 2163 of the mounting support 216, so that the scraper 215 can avoid the mounting support 216 from contacting the mounting block 11, thereby scraping off the lubricating oil on the mounting block 11.

[0067] In this embodiment, the scraper 215 is made of soft rubber material, which can avoid scratching the surface of the mounting block 11 and ensure the airtightness of the mounting block 11 to the battery housing 4.

[0068] Further, such as Fig.17 , Fig.18 As shown, a mounting groove 2161 for mounting the scraper 215 is provided at the bottom of the mounting support 216, and the mounting groove 2161 is opened at the bottom of the side plate 2163, and the depth of the mounting groove 2161 is less than the length of the scraper 215; perpendicular to the moving direction of the scraper 215, the length of the mounting groove 2161 is less than the length of the scraper 215, and the mounting groove 2161 is opened at both sides of the side plate 2163, so as to allow the scraper 215 to protrude from the side plate 2163 toward one side of the mounting block 11. Fig.18 As shown, the scraper 215 is a plate-like structure as a whole. The scraper 215 includes a mounting portion 2151 and an oil scraping portion 2152. The mounting portion 2151 is connected to the oil scraper plate, and the mounting portion 2151 is arranged in a mounting groove 2161. The width of the mounting portion 2151 is L1, the width of the oil scraping portion 2152 is L2, and the width of the mounting groove 2161 is L3. L1>L3≥L2, that is, the width of the mounting portion 2151 is greater than the width of the mounting groove 2161. By setting the mounting portion 2151 in the mounting groove 2161, the scraper 215 and the mounting groove 2161 can be clamped to prevent the scraper 215 from falling off from the mounting groove 2161.

[0069] In this embodiment, the mounting portion 2151 is a cylindrical structure with a diameter of L1, the oil scraping portion 2152 is a plate-like structure, and the symmetric center line of the mounting portion 2151 and the oil scraping portion 2152 is in the radial direction of the mounting portion 2151, that is, the oil scraping plate is a symmetrical structure. In addition, the mounting portion 2151 can also be a straight column structure or other structure that can achieve the clamping of the mounting portion 2151 and the mounting groove 2161, and its specific structure is not limited.

[0070] When the scraper 215 scrapes the oil from the mounting block 11, refer to Fig.15 , Fig.17 As shown, since the sealing ring 13 extends beyond the mounting block 11 on all sides, the lubricating oil remaining on the mounting block 11 of the battery housing 4 will gather near the connection between the mounting block 11 and the sealing ring 13 under the action of gravity; therefore, the bottom of the scraper 215 acts on the upper end surface of the sealing ring 13, and the end surface of the scraper 215 close to the mounting block 11 fits with the side surface of the mounting block 11, so that when the scraper 215 moves along the side surface of the mounting block 11, the scraper 215 can simultaneously act on the side surface of the mounting block 11 and the top of the sealing ring 13, and take away the lubricating oil on the side surface of the mounting block 11 and the upper end surface of the sealing ring 13 at the same time, so as to prevent the lubricating oil from adhering to the mounting block 11 or accumulating on the upper end of the sealing ring 13, and to prevent the residual lubricating oil from affecting the placement of the battery housing 4 on the mounting block 11 as much as possible.

[0071] In another optional embodiment of the present application, the oil scraper assembly 21 includes at least two first mounting brackets 211, and the oil scraper drive assembly 22 includes a first oil scraper drive member 221 and a first guide rail 223; the first mounting bracket 211 is a straight column structure, and the two first mounting brackets 211 are parallel and spaced apart and respectively arranged on both sides of the first side surface 115 of the mounting block 11; Fig.12 , Fig.13 As shown, two first mounting brackets 211 are arranged along a first direction, and the first direction is parallel to the first side surface 115, wherein the two first mounting brackets 211 are close to the first scraper driving member 221, and are provided with a first fixing bracket 217, the first fixing bracket 217 is a straight column structure, and the first fixing bracket 217 is perpendicular to the first mounting bracket 211, and the linkage between the multiple first mounting brackets 211 is realized by setting the first fixing bracket 217; Fig.15 As shown, the first guide rail 223 is arranged parallel to the first mounting bracket 211. Among the two adjacent first mounting brackets 211, the first guide rail 223 is arranged at the bottom of one of them, and the other is connected to the first oil scraper driving member 221; the first oil scraper driving member 221 generates a thrust parallel to the first direction to push the first mounting bracket 211 to move.

[0072] The first oil scraping driving member 221 has a first driving stroke for the first mounting bracket 211 , and the first driving stroke is greater than the length of the first side surface 115 to ensure that the lubricating oil on the first side surface 115 can be completely scraped off.

[0073] Furthermore, the scraper assembly 21 includes at least two second mounting brackets 212, and the scraper drive assembly 22 includes a second scraper drive member 222 and a second guide rail 224; the second mounting bracket 212 is a straight column structure, and the two second mounting brackets 212 are parallelly spaced and respectively arranged on both sides of the second side surface 116 of the mounting block 11; Fig.12 , Fig.13 As shown, two second mounting brackets 212 are arranged along the second direction, and the second direction is parallel to the second side surface 116, wherein the two second mounting brackets 212 are close to the second scraper drive member 222, and are provided with a second fixing bracket 218, the second fixing bracket 218 is a straight column structure, and the second fixing bracket 218 is perpendicular to the second mounting bracket 212, and the linkage between the plurality of second mounting brackets 212 is realized by arranging the second fixing bracket 218; Fig.14 As shown, the second guide rail 224 is arranged parallel to the second mounting bracket 212. Among the two adjacent second mounting brackets 212, the second guide rail 224 is arranged at the bottom of one of them, and the other is connected to the second oil scraper driving member 222; the second oil scraper driving member 222 generates a thrust parallel to the second direction to push the second mounting bracket 212 to move.

[0074] In this embodiment, the first direction is perpendicular to the second direction, that is, the length extension direction of the first guide rail 223 is perpendicular to the length extension direction of the second guide rail 224, and the first mounting bracket 211 is perpendicular to the second mounting bracket 212. The second scraper drive member 222 has a second driving stroke for the second mounting bracket 212, and the second driving stroke is greater than the length of the second side surface 116 to ensure that the lubricating oil on the second side surface 116 can be completely scraped off.

[0075] Among them, Fig.13 , Fig.16 As shown, the first mounting bracket 211 and the second mounting bracket 212 are staggered in the vertical direction. In this embodiment, the first mounting bracket 211 is arranged on the upper end of the second mounting bracket 212; the oil scraping assembly 21 includes a first oil scraping member 213 and a second oil scraping member 214, the first oil scraping member 213 is arranged on the first mounting bracket 211, and the second oil scraping member 214 is arranged on the second oil scraping member 214; wherein, as Fig.16 As shown, under the joint cooperation of the first mounting bracket 211 and the second mounting bracket 212, a rectangular structure surrounding the mounting block 11 can be formed, and each mounting block 11 corresponds to two first oil scraping members 213 and two second oil scraping members 214 to scrape oil from the two first side surfaces 115 and the two second side surfaces 116 of the mounting block 11 respectively; wherein the bottom of the first oil scraping member 213 is flush with the bottom of the second oil scraping member 214.

[0076] In this embodiment, in order to ensure that the first mounting bracket 211 and the second mounting bracket 212 do not interfere with each other when they move, Fig.14 , Fig.15 As shown, the first guide rail 223 is disposed at the bottom of the front end of the first mounting bracket 211, and the second guide rail 224 is disposed at the bottom of the second mounting bracket 212 to reduce interference between the two guide rails.

[0077] like Fig.12 , Fig.13 As shown, the mounting blocks 11 are arranged in n rows, each row includes m pieces, then the first mounting brackets 211 are arranged in (m+1) pieces, and the second mounting brackets 212 are arranged in (n+1) pieces, so as to ensure that the oil around each mounting block 11 can be scraped off; in the present application, the mounting blocks 11 are arranged in two rows, each row includes six pieces, then the first mounting brackets 211 are arranged in seven pieces, and the second mounting brackets 212 are arranged in three pieces.

[0078] It should be noted that, in the present application, the first scraper drive 221 and the second scraper drive 222 can be set as cylinders or oil cylinders or electric drive components, as long as they can drive the first mounting bracket 211 and the second mounting bracket 212 to move in a straight line.

[0079] It should be noted that the various embodiments of the present application can be arbitrarily combined into a new embodiment if the solutions do not conflict and the technical solutions can coexist.

[0080] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery housing air tightness detection device, characterized in that: include: A detection mechanism (1) is used to install a battery housing (4) to perform airtightness detection; The detection mechanism (1) is provided with a circulation channel, and the circulation channel is connected to the interior of the battery housing (4) to form a sealed pressure measurement space; A loading mechanism (3) for loading and unloading materials from the detection mechanism (1); An air extraction member, used for extracting air from the pressure measuring space to form a negative pressure in the pressure measuring space; The mounting platform (5) is used to mount the detection mechanism (1) and the feeding mechanism (3).

2. The battery casing air tightness detection device according to claim 1, characterized in that: The detection mechanism (1) comprises a mounting block (11) and a mounting base (12); the battery housing (4) is sleeved on the mounting block (11); and the mounting block (11) is sealingly arranged on the mounting base (12); The circulation channel comprises a first gas channel (111) and a second gas channel (121); the first gas channel (111) is arranged on the mounting block (11), and the second gas channel (121) is arranged on the mounting base (12); The second gas channel (121) is connected to the interior of the battery housing (4) through the first gas channel (111), and one end of the second gas channel (121) away from the first gas channel (111) is connected to the gas extraction member.

3. The battery casing air tightness detection device according to claim 2, characterized in that: It also includes an oil scraping mechanism (2), wherein the oil scraping mechanism (2) is arranged on the mounting platform (5); The oil scraping mechanism (2) comprises an oil scraping assembly (21) and a feeding drive assembly (32), wherein the feeding drive assembly (32) is used to drive the oil scraping assembly (21) to move parallel to the side of the mounting block (11) to scrape off the lubricating oil on the periphery of the mounting block (11).

4. The battery casing air tightness detection device according to claim 2, characterized in that: The detection mechanism (1) further comprises a sealing ring (13), wherein the sealing ring (13) is sleeved at the connection between the mounting block (11) and the mounting base (12); The mounting block (11) is provided with a sealing groove (113); the sealing ring (13) is at least partially located in the sealing groove (113) and at least partially located at the bottom of the battery housing (4); the sealing ring (13) is used to seal between the battery housing (4), the mounting block (11) and the mounting base (12).

5. The battery casing air tightness detection device according to claim 2, characterized in that: The first gas channel (111) is divided into a first channel (1111) and a second channel (1112), and the second channel (1112) is arranged on both sides of the first channel (1111); The first channel (1111) is in communication with the interior of the battery housing (4) via the second channel (1112); an end of the first channel (1111) away from the second channel (1112) is in communication with the air extraction member; Wherein, in the vertical direction, the end of the second channel (1112) communicating with the battery housing (4) is lower than the end communicating with the first channel (1111) and higher than the bottom of the battery housing (4).

6. The battery casing air tightness detection device according to claim 5, characterized in that: The second gas channel (121) comprises a third channel (1211) and a fourth channel (1212), the third channel (1211) being arranged in a vertical direction, and the fourth channel (1212) being arranged perpendicular to the third channel (1211); The third channel (1211) is used to connect the fourth channel (1212) with the mounting block (11), and the fourth channel (1212) is used to connect the third channel (1211) with the air extraction member.

7. The battery casing air tightness detection device according to claim 2, characterized in that: The mounting block (11) is provided with a mounting through hole (112), and the mounting through hole (112) passes through the mounting block (11) in a vertical direction; The mounting base plate is provided with a limiting blind hole (122), and the mounting through hole (112) and the limiting blind hole (122) are used for inserting the same connecting piece; A pressure relief groove (114) is provided on the outer side surface of the mounting block (11), and the pressure relief groove (114) is recessed towards the center of the mounting block (11).

8. The battery casing air tightness detection device according to any one of claims 1 to 7, characterized in that: The detection mechanism (1) further comprises a detection component, an air intake valve (14) and a pressure extraction valve (15); the pressure extraction valve (15) comprises at least three joints, the three joints being respectively connected to the air extraction component, the air intake valve (14) and the mounting base (12); The pressure extraction valve (15) is used to control the communication between the pressure measuring space and the air extraction component, and the air intake valve (14) is used to control the communication between the external air and the pressure measuring space; The detection element is used to detect the pressure value in the pressure measuring space.

9. The battery casing air tightness detection device according to claim 8, characterized in that: The feeding mechanism (3) comprises a feeding claw (31) and a feeding drive assembly (32), and the feeding claw (31) is connected to the feeding drive assembly (32); The loading gripper (31) is used to grab the battery housing (4) onto the detection mechanism (1), and the loading drive assembly (32) is used to drive the loading gripper (31) to move back and forth between the placing station and the installation station.

10. The battery casing air tightness detection device according to claim 9, characterized in that: The loading gripper (31) comprises a suction cup (315) and a buffer pad (311), and the buffer pad (311) is provided with a mounting hole for mounting the suction cup (315); The suction cup (315) is used to absorb the battery housing (4), and the buffer pad (311) is used to provide elastic buffering force to the battery housing (4); Wherein, the hardness of the buffer pad (311) is 70-80A.

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