Air tightness detection device for battery shell

Abstract

The air tightness detection device for the battery shell is provided with the mounting mechanism and the pressure pumping mechanism, the mounting mechanism is used for mounting the battery shell, the mounting mechanism and the battery shell form the sealed pressure measuring space, the pressure pumping mechanism is communicated with the pressure measuring space, and the pressure pumping mechanism can pump air in the pressure measuring space, so that negative pressure is formed in the pressure measuring space, and the air tightness of the battery shell is detected. The mounting mechanism comprises a detection piece, the detection piece can measure the negative pressure value in the pressure measurement space so as to judge whether the pressure measurement space leaks air, and the pressure measurement space is formed by sealing the battery shell and the mounting mechanism together, so that if the pressure measurement space leaks air, the surface battery shell leaks air, and the air tightness of the battery shell can be detected; according to the air tightness detection device, the air tightness of the battery shells can be automatically detected, manual plugging is not needed, the number of the installation stations of the installation mechanism can be set according to actual use requirements, air tightness detection of the multiple battery shells is achieved at the same time, the operation difficulty is reduced, and the detection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery shell detection, in particular to a gas tightness detection device for a battery shell. BACKGROUND

[0002] The gas tightness of a lithium battery shell plays a key role in subsequent product use. If the gas tightness of the battery shell is poor, the internal liquid of the lithium battery will leak during use, which will affect the safety of use.

[0003] In the prior art, the gas tightness detection step of most battery shells is placed after the shell is formed. The gas tightness is detected by plugging the circuit through hole or water inlet and outlet on the battery shell, and by detecting whether air leakage occurs in the shell. However, this detection method has many factors affecting the gas tightness, including whether the plug hole is tightly plugged, whether the cover plate of the battery shell is tightly welded, and the like. Therefore, there are many interference factors in the detected results, and the specific air leakage points cannot be accurately investigated.

[0004] In addition, in the prior art, manual plugging is required. Manual plugging can only be performed on one at a time, the working efficiency is extremely low, and the operation is relatively complicated.

[0005] Therefore, the gas tightness detection of the battery shell in the prior art has further improvement space. CONTENT OF THE INVENTION

[0006] Therefore, in view of the technical problems of manual plugging, low working efficiency and complicated operation in the prior art lithium battery shell gas tightness detection, the application provides a gas tightness detection device for a battery shell. The device is provided with an extraction and pressure mechanism and a mounting mechanism. The battery shell is mounted on the mounting mechanism. The mounting mechanism seals the battery shell. The mounting mechanism is provided with a channel communicating with the inside of the battery shell and the extraction and pressure mechanism. The extraction and pressure mechanism extracts the gas in the battery shell to form negative pressure in the battery shell. The extraction and pressure mechanism is provided with a detector. The negative pressure in the battery shell can be detected to determine whether the battery shell leaks. The device does not require manual plugging, has high detection precision, is simple to operate, and has high working efficiency.

[0007] The application provides a gas tightness detection device for a battery shell, which comprises:

[0008] A mounting mechanism is used to mount the battery shell and form a sealed pressure measurement space with the battery shell.

[0009] An extraction and pressure mechanism is used to extract air in the pressure measurement space to form negative pressure in the pressure measurement space.

[0010] The mounting mechanism comprises a detection member, which is used to detect the negative pressure in the pressure measurement space.

[0011] Compared with the prior art, the air tightness detection device for the battery shell provided by the application is provided with a mounting mechanism and a pressure extraction mechanism. The mounting mechanism is used for mounting the battery shell and forms a sealed pressure measurement space with the battery shell. The pressure extraction mechanism is in communication with the pressure measurement space. The pressure extraction mechanism can extract air in the pressure measurement space, so that the pressure measurement space forms a negative pressure. The mounting mechanism includes a detection piece, which can measure the negative pressure value in the pressure measurement space, so as to judge whether the pressure measurement space leaks. Since the pressure measurement space is formed by the battery shell and the mounting mechanism, if the pressure measurement space leaks, the surface battery shell leaks. Therefore, the air tightness of the battery shell can be detected. In the application, automatic detection of the air tightness of the battery shell can be realized, manual plugging is not required, the mounting stations of the mounting mechanism can be set in number according to actual use requirements, air tightness detection of multiple battery shells can be realized at the same time, the operation difficulty is reduced, and the detection efficiency is improved.

[0012] Preferably, the mounting mechanism includes a mounting block, and the battery shell is sleeved on the mounting block.

[0013] The mounting block is provided with a gas passage for communicating the inside of the battery shell with the pressure extraction mechanism.

[0014] Preferably, the mounting mechanism further includes a mounting base for mounting the mounting block.

[0015] The mounting base is provided with a connecting passage for communicating the gas passage with the pressure extraction mechanism.

[0016] Preferably, the mounting mechanism further includes a sealing ring sleeved at the connecting position of the mounting block and the mounting base.

[0017] The mounting block is provided with a sealing groove, and the sealing ring is at least partially located in the sealing groove and at least partially located at the bottom of the battery shell.

[0018] Preferably, the gas passage is divided into a first passage and a second passage. The second passage is arranged on both sides of the first passage. One end of the second passage is in communication with the inside of the battery shell, and the other end is in communication with the first passage.

[0019] One end of the first passage away from the one end of the second passage is in communication with the pressure extraction mechanism.

[0020] In the vertical direction, the end of the second passage in communication with the battery shell is lower than the end in communication with the first passage and higher than the bottom of the battery shell.

[0021] Preferably, the connecting passage includes a third passage and a fourth passage. The third passage is arranged in the vertical direction, and the fourth passage is perpendicular to the third passage.

[0022] The third channel is used for connecting the fourth channel and the mounting block, and the fourth channel is used for connecting the third channel and the pumping mechanism.

[0023] The inner diameter of the third channel is smaller than the inner diameter of the first channel.

[0024] Preferably, the mounting block is provided with a mounting through hole penetrating the mounting block in the vertical direction.

[0025] The mounting base 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.

[0026] The mounting block is provided with a pressure relief groove on the outer side surface, and the pressure relief groove is recessed towards the center of the mounting block.

[0027] Preferably, the device further comprises a feeding mechanism, the feeding mechanism comprising a feeding gripper and a driving assembly, the feeding gripper being connected with the driving assembly.

[0028] The feeding gripper is used for grabbing the battery shell to the mounting mechanism, and the driving assembly is used for driving the feeding gripper to reciprocate between the material placing station and the mounting station.

[0029] 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.

[0030] The suction cup is used for sucking the battery shell, and the buffer pad is used for providing elastic buffer force to the battery shell.

[0031] Preferably, the hardness of the buffer pad is 70-80A.

[0032] Preferably, the mounting mechanism further comprises an air inlet valve and a pumping valve, and the pumping valve comprises at least three joints, respectively connected with the pumping mechanism, the air inlet valve and the mounting base.

[0033] The pumping valve is used for controlling the communication between the pressure measuring space and the pumping mechanism, and the air inlet valve is used for controlling the communication between the external air and the pressure measuring space.

[0034] The battery shell air tightness detection device has at least the following technical effects:

[0035] 1、By setting the mounting block, mounting base and sealing ring, the battery shell is sleeved on the mounting block, and the sealing washer seals the installation of the battery shell and the mounting block, so that the inside of the battery shell is communicated with the channel on the mounting block and the mounting base for gas circulation, and then the battery shell and the mounting mechanism form a sealed pressure measuring space, when the pressure extraction mechanism extracts the gas in the pressure measuring space, the pressure measuring space can be converted from normal pressure to negative pressure, and whether the negative pressure value changes can be measured by the detection piece, so that the detection of the air tightness of the battery shell can be realized, by directly measuring in the battery shell, the extrusion influence of the battery shell during pressure extraction can be reduced, and external interference factors can be reduced, so that the measurement can be carried out before the battery shell is capped, and the control of the air tightness influencing factors of the battery shell is facilitated;

[0036] 2、By setting the second channel of the gas channel on the mounting block to be inclined, the second channel includes two end portions, respectively, a communication end with the inside of the battery shell and a communication end with the first channel, wherein the height of the communication end with the inside of the battery shell in the vertical direction is lower than the height of the communication end with the first channel, so that the second channel is inclined, and when the pressure is extracted, the oil stains in the inside of the battery shell will not easily enter the first channel through the second channel, so that the oil stains can be prevented from entering the pressure extraction mechanism, and the service life of the pressure extraction mechanism is avoided;

[0037] 3、By setting the feeding mechanism, the feeding mechanism includes a feeding hand claw and a driving assembly, the feeding hand claw can grab the battery shell on the assembly line to the detection device for detection, and the driving assembly can drive the feeding hand claw to move, so that the battery shell can be flexibly taken, the demand for manual operation is reduced, and the work efficiency is improved;

[0038] 4、By setting the air inlet valve and the pressure extraction valve, the air inlet and the pressure extraction are controlled separately, and interference between the pressure extraction and the air inlet back pressure is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a three-dimensional structure schematic of the air tightness detection device for the battery shell provided by an embodiment of the application Figure One ;

[0040] Figure 2 is a three-dimensional structure schematic of the air tightness detection device for the battery shell provided by an embodiment of the application Figure Two ;

[0041] Figure 3 is a partial cross-sectional structure schematic of the mounting mechanism provided by an embodiment of the application;

[0042] Figure 4 is Figure 1 a partial A enlarged schematic view;

[0043] Figure 5 isFigure 2 a local B enlarged schematic view of figure 1;

[0044] Figure 6 a local C enlarged schematic view of figure 1; Figure 3 a local C enlarged schematic view of figure 1;

[0045] Figure 7 a perspective structural schematic view of the mounting block according to an embodiment of the present application;

[0046] Figure 8 a sectional structural schematic view of the mounting block according to an embodiment of the present application;

[0047] Figure 9 a perspective structural schematic view of the mounting base according to an embodiment of the present application;

[0048] Figure 10 a sectional structural schematic view of the mounting base according to an embodiment of the present application.

[0049] FIG. 1 is a schematic view of a mounting mechanism according to an embodiment of the present application;

[0050] 11, mounting block; 12, mounting base; 13, sealing ring; 14, air inlet valve; 15, suction and pressure valve; 16, branch joint;

[0051] 111, gas passage; 112, mounting through hole; 113, sealing groove; 114, pressure relief groove; 1111, first passage; 1112, second passage;

[0052] 121, connecting passage; 122, limiting blind hole; 1211, third passage; 1212, fourth passage;

[0053] 131, limiting convex ring;

[0054] 31, feeding gripper; 32, driving assembly; 33, feeding support; 311, buffer pad; 312, connecting base; 313, sliding rod; 314, connecting support; 321, first driving member; 322, second driving member. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail, clearly and completely in the following with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0056] In the description of the present application, if the first, second, etc. are described for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implying the number of the indicated technical features or the sequence of the indicated technical features.

[0057] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0058] The present application will be further described in detail below with reference to the accompanying drawings, see as Figures 1 to 10 Description.

[0059] The present application provides a kind of battery shell gas tightness detection device (hereinafter referred to as detection device), it is used to detect the gas tightness of lithium battery shell 4, can detect whether the crack generated in the stretch forming of metal battery shell 4, it can be applied in any link after battery shell 4 forming, carries out automatic gas tightness detection to battery shell 4, reduces manual operation demand, improves work efficiency.

[0060] Specifically, as Figures 1 to 6 Indicated, detection device includes installation support 2, installation mechanism 1, suction mechanism and feeding mechanism 3, installation support 2 is used to install installation mechanism 1, suction mechanism and feeding mechanism 3, installation mechanism 1 is used to install battery shell 4, and provides pressure measuring space, and can detect the negative pressure value in pressure measuring space;Suction mechanism is used to manufacture negative pressure test condition;Feeding mechanism 3 is used to place battery shell 4 on installation mechanism 1, or take out battery shell 4 from installation mechanism 1, three mechanisms cooperate to realize the automatic detection of the gas tightness of battery shell 4, manual demand is extremely low, work efficiency is greatly improved.

[0061] Among them, in installation mechanism 1, as Figures 1 to 2 Indicated, installation mechanism 1 is provided with a plurality of installation stations, each installation station corresponds to install one battery shell 4, each installation station is correspondingly provided with feeding station, so that detection device can simultaneously detect multiple battery shell 4 at a time, greatly improve work efficiency.

[0062] Further, installation mechanism 1 is described in detail;As Figures 3 to 10As shown, the mounting mechanism 1 comprises a mounting block 11, a mounting base 12 and a sealing ring 13, the mounting base 12 is arranged on the mounting bracket 2, the mounting block 11 is arranged on the mounting base 12, and the sealing ring 13 is sleeved at the connecting part of the mounting block 11 and the mounting base 12 to realize 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 shell 4, and is slightly smaller than the battery shell 4, so that the battery shell 4 can be sleeved on the mounting block 11; the mounting base 12 is a rectangular block structure, and the width and length thereof are greater than those of the mounting block 11; the sealing ring 13 is a rectangular ring structure, which is sleeved at the bottom of the mounting block 11, and the length and width thereof are greater than those of the mounting block 11, and are less than those of the mounting base 12, so as to ensure that the sealing ring 13 and the mounting block 11 can be fully placed on the mounting base 12, and the stable connection and sealing performance of the mounting mechanism 1 to the battery shell 4 are ensured.

[0063] As shown in Figure 3 、 Figures 6 to 10 , the mounting block 11 is provided with a gas passage 111, one end of which is opened on the side wall of the mounting block 11 and communicates with the inside of the battery shell 4, and the other end is opened on the bottom of the mounting block 11; the mounting base 12 is provided with a connecting passage 121, one end of which is opened on the upper end surface of the mounting base 12 and communicates with the gas passage 111, and the other end is opened on the side end surface of the mounting base 12 and communicates with the suction and pressure mechanism, so that a pressure measuring space is formed in the mounting mechanism 1 and communicates with the inside of the battery shell 4, the pressure measuring space is formed by the inside of the battery shell 4 and the passage in the mounting mechanism 1, and manual plugging is not required, at the same time, the battery shell 4 is directly sleeved on the mounting block 11, direct pressure measurement can be performed in the battery shell 4, the mounting block 11 has a certain supporting effect on the structure of the battery shell 4, which can avoid extrusion deformation of the battery shell 4 caused by negative pressure, reduce the probability of damage of the battery shell 4 in the airtightness detection, and the operation is simple, without worrying about the problems of plugging and air leakage, which can reduce the interference factors in the detection, and greatly improve the detection accuracy.

[0064] As shown in Figure 3 、 Figures 6 to 8As shown, the bottom of the mounting block 11 is provided with an annular sealing groove 113, which is recessed inwardly. The sealing groove 113 is used for mounting the sealing ring 13. The horizontal depth of the sealing groove 113 is smaller 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. The exposed part plays a supporting role for the battery shell 4. When the battery shell 4 is sleeved on the mounting block 11, the bottom of the battery shell 4 is in contact 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 shell 4 and the mounting block 11, so as to ensure the effective sealing of the pressure measuring space formed by the mounting mechanism 1 and the battery shell 4, and to ensure the accuracy of the air tightness detection.

[0065] Further, as shown in Figure 6 , the bottom of the sealing ring 13 is in contact with the upper end surface of the mounting base 12. The bottom of the sealing ring 13 is provided with a limiting convex ring 131, which is located at the middle position of the sealing ring 13. The limiting convex ring 131 is in an annular structure and protrudes downward. The cross section of the limiting convex ring 131 is in a hemispherical structure. The limiting convex ring 131 is relatively small and 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 of 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 sliding when the sealing ring 13 and the mounting base 12 are in surface contact, thereby improving the sealing performance of the mounting mechanism 1.

[0066] In this embodiment, two limiting convex rings 131 are provided on the sealing ring 13 and are uniformly and spacedly arranged to ensure stable stress.

[0067] As shown in Figure 5 , Figures 8 to 10 , the mounting block 11 is provided with mounting through holes 112, which penetrate the mounting block 11 in the vertical direction. The mounting through holes 112 are arranged in two groups and symmetrically arranged on both sides of the gas passage 111, with two mounting through holes 112 in each group. Correspondingly, the mounting base 12 is provided with limiting blind holes 122, which are coaxially arranged with the mounting through holes 112. The limiting blind holes 122 are open at the upper end surface of the mounting base 12 and not open at the bottom. The mounting through holes 112 and the limiting blind holes 122 are used for inserting the same connecting piece. The connecting piece is inserted into the mounting through holes 112 and the limiting blind holes 122 from top to bottom, thereby realizing the connection between the mounting block 11 and the mounting base 12. In addition, the bottom of the connecting piece does not penetrate 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 shell 4, thereby avoiding the leakage at the bottom of the mounting base 12 and affecting the air tightness detection error of the battery shell 4.

[0068] As shown in Figure 8 , the mounting hole 112 is divided into a first part and a second part, the first part is located above the second part, the inner diameter of the first part is larger than that of the second part, so that the head of the connecting piece (bolt or screw) can be limited in the first part by the second part, avoiding the head of the connecting piece protruding to the surface of the mounting block 11 and affecting the installation of the battery shell 4.

[0069] In addition, as shown in Figure 3 , Figure 5 , Figures 7 to 8 , the top of the mounting block 11 is provided with a guide surface, which is an inclined structure, so that the top of the mounting block 11 is a conical structure, the width and length of the upper end of the mounting block 11 are smaller than those of the middle and bottom, so that when the battery shell 4 is installed from top to bottom, the guide surface can guide the battery shell 4, so that the battery shell 4 can be smoothly installed on the mounting block 11, while reducing the area of the initial contact between the battery shell 4 and the mounting block 11, reducing the probability of collision between them due to not being completely aligned, reducing the impact on the battery shell 4, and improving the protection of the battery shell 4.

[0070] Among them, Figure 9 As shown in the side of the mounting block 11 is provided with a buffer groove 114, the buffer groove 114 is arranged along the vertical direction, the buffer groove 114 is recessed towards the center of the mounting block 11, a plurality of buffer grooves 114 are arranged at intervals, the buffer groove 114 reduces the fitting area of the outer side of the mounting block 11 and the battery shell 4, which can reduce the adhesion area of the oil to the battery shell 4 and the mounting block 11, reduce the oil adsorption force, so that the feeding mechanism 3 can easily take off the battery shell 4 from the mounting block 11.

[0071] Further, as shown in Figure 3 , Figure 6 , the gas passage 111 is divided into a first passage 1111 and a second passage 1112, the second passage 1112 is symmetrically arranged on both sides of the first passage 1111, the first passage 1111 is arranged along the vertical direction, the lower end of the first passage 1111 is opened at the bottom of the mounting block 11, the upper end of the first passage 1111 is located at about 4 / 5 of the height of the mounting block 11, the upper end of the first passage 1111 is not provided with a vertical opening on the mounting block 11, but both ends are provided with openings communicating with the second passage 1112; specifically, the second passage 1112 includes two ports, which are a first port and a second port, the first port is opened on the outer side wall of the mounting block 11, and the second port extends inward to communicate with the position of the upper end of the first passage 1111, so that the first passage 1111 can communicate with the inside of the battery shell 4 through the second passage 1112, and then the air inside the battery shell 4 can be sucked away to generate negative pressure.

[0072] In this embodiment, asFigure 3 As shown in the drawings, in the vertical direction, the first port of the second channel 1112 is lower than the second port, so that the second channel 1112 is inclined, and when the pumping mechanism pumps out the air in the pressure measuring space, the gas in the battery shell 4 enters the first channel 1112 through the second channel 1112, and then enters the connecting channel 121 of the mounting base 12. When the gas enters the first channel 1111 from the second channel 1112, the oil stains and other impurities will be guided downward by the second channel 1112 during the process of climbing from the first port to the second port, and it is difficult for them to enter the first channel 1111 through the second port. Therefore, it is ensured that impurities and the like cannot enter the pumping mechanism, thereby avoiding affecting the pumping mechanism.

[0073] In this embodiment, the first port of the second channel 1112 is higher than the bottom of the mounting block 11, and the first port is located at about the height of the mounting block 112 / 3, so that it is difficult for oil stains and other impurities to enter the first port of the second channel 1112, and the impurities in the pumping can be further avoided from entering the pumping mechanism, thereby further ensuring the safety of the use of the pumping mechanism.

[0074] As shown in the drawings, Figure 3 , Figure 6 , Figures 9 to 10 The connecting channel 121 includes a third channel 1211 and a fourth channel 1212. The third channel 1211 is arranged in the vertical direction, and the upper end of the third channel 1211 is open on the upper end surface of the mounting base 12 and communicates with the first channel 1111. The lower end of the third channel 1211 communicates with the fourth channel 1212. The fourth channel 1212 is perpendicular to the third channel 1211, and one end of the fourth channel 1212 is open on the side wall of the mounting base 12 and communicates with the pumping mechanism. The other end of the fourth channel 1212 extends to the middle position of the mounting base 12 in the horizontal direction, and the portion of the fourth channel 1212 located in the mounting base 12 is provided with an upward opening to communicate with the third channel 1211. Thus, the connecting channel 121 communicates with the gas channel 111.

[0075] In this embodiment, when the pumping mechanism pumps out the air, the gas in the battery shell 4 enters the pumping mechanism through the second channel 1112, the first channel 1111, the third channel 1211, and the fourth channel 1212 in sequence, thereby realizing the formation of negative pressure in the pressure measuring space. Through the cooperation of the detection piece, the air tightness detection is realized.

[0076] In addition, as shown in the drawings, Figures 1 to 2 , Figure 4As shown, the mounting mechanism 1 further comprises branch joints 16, an air inlet valve 14 and a suction valve 15 arranged on the mounting bracket 2, the number of the branch joints 16 corresponds to the number of the mounting stations, that is, one branch joint 16 is arranged corresponding to each mounting station; the fourth channel 1212 of the mounting base 12 is provided with an air outlet joint, the air outlet joint and the branch joint 16 are connected through a pipeline, and the air outlet end of the air outlet joint is communicated with the suction valve 15 through a pipeline; in this embodiment, a detection member is arranged in the branch joint 16 to detect the pressure value in the pressure measuring space; wherein the suction valve 15 comprises at least three joints, which are respectively communicated with the suction mechanism, the air inlet valve 14 and the mounting base 12 through pipelines.

[0077] In this embodiment, the suction valve 15 is used to control the communication between the pressure measuring space and the suction mechanism, that is, when suction is needed, the communication between the suction mechanism and the branch joint 16 is controlled to be opened by the suction valve 15, and the communication between the air inlet valve 14 and the pressure measuring space is closed at the same time, the pressure measuring space is suctioned by the suction mechanism, and when the pressure measuring space measures the rated value, the communication between the suction mechanism and the pressure measuring space is closed, and the pressure in the pressure measuring space is maintained, during the pressure maintaining period, the detection member in the branch joint 16 measures whether the pressure value in the pressure measuring space changes, if it changes, it means that the battery shell 4 has the probability of air leakage, and the air tightness of the battery shell 4 may be poor;

[0078] When the pressure measurement is completed, the pressure measuring space needs to be depressurized so that the feeding mechanism 3 can take the battery shell 4 from the mounting shell; when depressurizing, the communication between the suction mechanism and the pressure measuring space needs to be closed, and then the communication between the air inlet valve 14 and the pressure measuring space is opened by the suction valve 15, so that the external air can enter the pressure measuring space through the air inlet valve 14 to depressurize the inside of the battery shell 4, so that the inside of the battery shell 4 returns to normal pressure, and the feeding mechanism 3 can easily take the battery shell 4 from the mounting block 11.

[0079] It should be noted that, as shown in Figure 3 , Figure 6 As shown, the inner diameter of the first channel 1111 is greater than the inner diameter of the second channel 1112, and the inner diameter of the third channel 1211 is smaller than the inner diameter of the fourth channel 1212, during suction, the gas flows from the second channel 1112 to the first channel 1111, the pressure decreases, and the impurities such as oil stains entering the first channel 1111 are reduced; the gas flows from the first channel 1111 to the third channel 1211, the pressure increases, and the oil stains and impurities entering the first channel 1111 can be impacted at the bottom of the first channel 1111, reducing the probability of entering the third channel 1211 and the fourth channel 1212;

[0080] When pressure relief, the gas flows from the third channel 1211 to the first channel 1111, the pressure decreases, so that the impurities in the air is difficult 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, accelerates the gas flow rate, accelerates the pressure relief rate, improves the detection efficiency.

[0081] In addition, as shown in Figure 6 The lower end of the third channel 1211 is provided with an opening 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 pressure relief, the impurities in the air will be washed into the bottom of the fourth channel 1212, reducing the probability of impurities entering the third channel 1211.

[0082] Further, the air inlet valve 14 and the pressure extraction mechanism are provided with a filter, so that when the pressure is extracted, the air entering the pressure extraction mechanism can be filtered to prevent impurities from entering the pressure extraction mechanism; 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.

[0083] On the basis of any of the above embodiments, the feeding mechanism 3 is further described; as shown in Figures 1 to 2 , Figure 5 The feeding mechanism 3 includes a feeding support 33, a feeding gripper 31 and a driving assembly 32. The feeding support 33 is an arcuate structure, and the two ends of the feeding support 33 are connected with the driving assembly 32. The feeding support 33 is connected with a plurality of feeding grippers 31, and the number of the feeding grippers 31 corresponds to the number of the mounting stations. The driving assembly 32 is used to drive the entire feeding mechanism to displace on a horizontal plane, so that the feeding grippers 31 can reciprocate between the material placing station and the mounting station. The material placing 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 driving assembly 32 drives the feeding grippers 31 to displace, so that the battery shell 4 can be moved to the mounting mechanism 1 for air tightness detection, or the detected battery shell 4 can be moved to the original station, so that the battery shell 4 can continue to complete subsequent work.

[0084] In this embodiment, as shown in Figure 3 The driving assembly 32 includes a driving support, a first driving member 321, a first sliding rail and a first sliding block. The driving support is fixedly connected with the mounting support 2. The first driving member 321 is arranged on the driving support. One side of the first sliding block is slidably connected with the first sliding rail, and the other side is fixedly connected with the driving support. The side of the first sliding rail away from the first sliding block is fixedly connected with the feeding support 33. The first driving member 321 is a linear driving member such as a pneumatic cylinder or an oil cylinder. The side end of the first driving member 321 is fixedly connected with the side end of the first sliding rail through a connecting plate. The first driving member 321 drives the first sliding rail to slide relative to the driving support, and then realizes the displacement of the feeding grippers 31 relative to the driving support.

[0085] As shown in Figure 3 The feeding hand claw 31 includes a connecting bracket 314, a connecting base 312, a suction cup and a buffer pad 311, the connecting bracket 314 is fixedly connected with the feeding bracket 33, the connecting base 312 is slidingly connected with the connecting bracket 314 through a slide rod 313, the connecting base 312 is fixedly connected at the bottom of the slide rod 313, and the slide rod 313 is slidingly connected with the connecting bracket 314; the buffer pad 311 and the suction cup are fixedly connected on the connecting base 312, the buffer pad 311 is provided with a mounting hole for the suction cup to pass through, the upper end of the suction cup is connected with the connecting base 312 by passing through the buffer pad 311, and the lower end of the suction cup is located at the lower end of the buffer pad 311 by passing through the buffer pad 311; the upper end of the suction cup is connected with a cylinder assembly for generating suction force to suck the battery shell 4; the buffer pad 311 is made of an elastic material, the hardness of the buffer pad 311 is 70-80A, and the buffer pad 311 can provide elastic buffering force for the battery shell 4 to avoid too much impact on the battery shell 4 when the suction cup sucks the battery shell 4.

[0086] In this embodiment, the hardness of the buffer pad 311 is set to be any one of 70A, 71A, 72A, 73A, 74A, 75A, 76A, 77A, 78A, 79A and 80A; specifically, 75A is preferred.

[0087] Further, as shown in Figure 3 The driving assembly 32 further includes a second driving member 322, the second driving member 322 is a driving element such as an oil cylinder or an air cylinder, the bottom of the second driving member 322 is fixedly connected with the upper end of the feeding bracket 33, the second driving member 322 is sleeved on the slide rod 313, and the second driving member 322 drives the slide rod 313 to move up and down by rotating, so as to drive the feeding hand claw 31 to move in the vertical direction, so that the feeding hand claw 31 can grab the battery shell 4 and move it downward to fall on the mounting block 11, or move the battery shell 4 on the mounting block 11 upward to take it away, greatly improving the use flexibility of the feeding mechanism 3.

[0088] It should be noted that in this application, two rows of mounting stations are provided, each row has six mounting stations, and a total of sixteen mounting stations, that is, in this application, sixteen battery shells 4 can be simultaneously detected for air tightness detection; correspondingly, the feeding hand claw 31 is divided into two groups, and the two groups are arranged on the two sides of the feeding bracket 33, and the number of the feeding hand claw 31 and the branch joint 16 corresponds to the number of the mounting stations; at the same time, as shown in Figure 4 The branch joint 16 is divided into two groups and arranged on the mounting bracket 2 in an up-down distribution, and each group of branch joints 16 is communicated with the suction valve 15 through an eight-way or seven-way joint.

[0089] It should be noted that in the present application, the pumping mechanism (not shown in the figure) includes a vacuum pump and other devices capable of pumping, and the detection member is a sensor device capable of pressure detection, which is not described here.

[0090] It should be noted that the embodiments of the present application can be arbitrarily combined into new embodiments under the condition that the schemes do not conflict and the technical schemes can coexist.

[0091] The above has introduced the present application in detail, and the principle and implementation mode of the present application have been described by applying specific examples. The above embodiment description is only used to help understand the present application and the core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A gas tightness detecting device for a battery case, characterized by, The application relates to a battery shell air tightness detection device. The application comprises: an installation mechanism (1) for installing a battery shell (4) and forming a sealed pressure measuring space with the battery shell (4); a pressure extraction mechanism for extracting air in the pressure measuring space to form negative pressure in the pressure measuring space; wherein the installation mechanism (1) comprises a detection member for detecting the negative pressure in the pressure measuring space.

2. The battery shell air tightness detection device according to claim 1, wherein the installation mechanism (1) comprises an installation block (11), and the battery shell (4) is sleeved on the installation block (11); a gas passage (111) is arranged on the installation block (11) and is used for connecting the inside of the battery shell (4) with the pressure extraction mechanism.

3. The battery shell air tightness detection device according to claim 2, wherein the installation mechanism (1) further comprises an installation base (12) for installing the installation block (11); a connecting passage (121) is arranged in the installation base (12) and is used for connecting the gas passage (111) with the pressure extraction mechanism.

4. The battery shell air tightness detection device according to claim 3, wherein the installation mechanism (1) further comprises a sealing ring (13) sleeved on the connection between the installation block (11) and the installation base (12); a sealing groove (113) is arranged on the installation block (11), and 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 shell (4).

5. The battery shell air tightness detection device according to claim 2, wherein the gas passage (111) is divided into a first passage (1111) and a second passage (1112), the second passage (1112) is arranged on both sides of the first passage (1111), one end of the second passage (1112) is connected with the inside of the battery shell (4), and the other end is connected with the first passage (1111); one end of the first passage (1111) is connected with the pressure extraction mechanism and is away from the one end of the second passage (1112); wherein, in the vertical direction, the end of the second passage (1112) connected with the battery shell (4) is lower than the end connected with the first passage (1111) and is higher than the bottom of the battery shell (4).

6. The battery shell air tightness detection device according to claim 3, wherein the connecting passage (121) comprises a third passage (1211) and a fourth passage (1212), the third passage (1211) is arranged in the vertical direction, and the fourth passage (1212) is arranged perpendicularly to the third passage (1211); wherein the third passage (1211) is used for connecting the fourth passage (1212) with the installation block (11), and the fourth passage (1212) is used for connecting the third passage (1211) with the pressure extraction mechanism; the inner diameter of the third passage (1211) is smaller than that of the first passage (1111). 7.The air tightness detection device for battery shell according to claim 3, characterized in that, the mounting block (11) is provided with a mounting through hole (112) penetrating the mounting block (11) in the vertical direction; the mounting base (12) 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; the mounting block (11) is provided with a pressure relief groove (114) on the outer side surface, and the pressure relief groove (114) is recessed towards the center of the mounting block (11). 8.The air tightness detection device for battery shell according to claim 1, characterized in that, further comprising a feeding mechanism (3), the feeding mechanism (3) comprising a feeding gripper (31) and a driving assembly (32), the feeding gripper (31) being connected with the driving assembly (32); the feeding gripper (31) is used for grabbing the battery shell (4) to the mounting mechanism (1), and the driving assembly (32) is used for driving the feeding gripper (31) to reciprocate between the placing station and the mounting station. 9.The air tightness detection device for battery shell according to claim 8, characterized in that, the feeding gripper (31) comprises a suction cup and a buffer pad (311), and the buffer pad (311) is provided with a mounting hole for mounting the suction cup; the suction cup is used for sucking the battery shell (4), and the buffer pad (311) is used for providing elastic buffer force to the battery shell (4); wherein the hardness of the buffer pad (311) is 70-80A. 10.The air tightness detection device for battery shell according to claim 1, characterized in that, the mounting mechanism (1) further comprises an air inlet valve (14) and a pressure extraction valve (15), the pressure extraction valve (15) comprising at least three joints, and the three joints are respectively communicated with the pressure extraction mechanism, the air inlet valve (14) and the mounting base (12); the pressure extraction valve (15) is used for controlling the communication between the pressure measurement space and the pressure extraction mechanism, and the air inlet valve (14) is used for controlling the communication between the external air and the pressure measurement space.

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