Lithium battery air tightness detection device
By using a vacuum adsorption nozzle assembly to connect with the bottom air port of the lithium battery in the lithium battery airtightness test, a vacuum environment is created, which solves the problems of helium leakage and introduction of impurity gases in the airtightness test, and achieves both accuracy and cost-effectiveness in the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-10
- Publication Date
- 2026-03-20
AI Technical Summary
In existing lithium battery airtightness testing, it is difficult to guarantee the airtightness at the connection between the gas nozzle and the lithium battery, which can lead to helium leakage or the introduction of impurity gases, affecting the accuracy of the test. Furthermore, helium is difficult to recover, increasing the testing cost.
A vacuum adsorption nozzle assembly is used to connect with the bottom air port of the lithium battery, creating a vacuum environment at the connection point. The lithium battery is then fixed in place by a vacuum adsorption device to ensure airtightness. At the same time, helium is recovered after the test to reduce helium loss.
It achieves accuracy and cost-effectiveness in lithium battery airtightness testing, avoids helium leakage and the introduction of impurity gases, and reduces testing costs.
Smart Images
Figure CN224019239U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of lithium battery air tightness detection, and specifically relates to a lithium battery air tightness detection device. BACKGROUND
[0002] In the process of manufacturing lithium batteries, the air tightness of the lithium batteries needs to be detected. In the prior art, the air tightness of the lithium batteries is usually detected by helium injection. The lithium battery is placed in a closed vacuum space, and then a certain amount of helium gas is injected into the lithium battery, and a helium mass spectrometer is used to detect whether there is helium gas in the vacuum space. If helium gas is detected in the vacuum space, it indicates that there is a small leakage point on the lithium battery.
[0003] However, the prior art has the following defects in the helium injection detection of the lithium battery:
[0004] 1. It is difficult to ensure the air tightness of the connection between the gas nozzle and the lithium battery, causing helium leakage or the introduction of impurity gas, which affects the final detection accuracy;
[0005] 2. The helium injected into the lithium battery is difficult to recover, causing helium waste and increasing the cost of lithium battery air tightness detection.
[0006] Therefore, in view of the above deficiencies in the prior art, the utility model discloses a lithium battery air tightness detection device. UTILITY MODEL CONTENTS
[0007] The utility model discloses a kind of lithium battery air tightness detection devices, can ensure the air tightness of the connection between gas nozzle and lithium battery in helium injection air tightness detection process, to avoid helium leakage, will not introduce impurity gas, ensure the accuracy of air tightness detection, while part helium can be recycled, reduce the cost of lithium battery air tightness detection.
[0008] The utility model realizes by the following technical scheme:
[0009] A kind of lithium battery air tightness detection device, including detection box body, the inner side bottom of the detection box body is provided with base, the top of the base is provided with detection limiting frame, the bottom of the detection limiting frame is provided with elastic seat assembly, the top of the elastic seat assembly is provided with vacuum adsorption butt joint gas nozzle assembly, the vacuum adsorption butt joint gas nozzle assembly is connected with helium source by first pipeline, the vacuum adsorption butt joint gas nozzle assembly is connected with first vacuum instrument by second pipeline, electromagnetic valve is provided on the first pipeline and second pipeline.
[0010] The utility model discloses a square lithium battery carries out air tightness detection, and through the mechanical hand is placed in the detection limiting frame inside square lithium battery, and through the detection limiting frame is limited to square lithium battery's front, back, left and right, makes the air port of square lithium battery bottom and vacuum suction docking air nozzle assembly alignment. The square lithium battery is lowered, makes the air port of square lithium battery bottom and the vacuum suction docking air nozzle assembly of elastic seat component top corresponding insertion, and vacuum suction docking air nozzle assembly can form vacuum sealed space with square lithium battery air port surrounding area closed, and then guarantee the air tightness of air port position when injecting helium into square lithium battery inside in succession, and through vacuum suction docking air nozzle assembly adsorption fixed square lithium battery, avoid square lithium battery to move.
[0011] After the air port and the vacuum suction docking air nozzle assembly are docked, the environment in the detection box body is sucked to vacuum, and the first vacuum instrument sucks the inside of the square lithium battery to vacuum through the second pipeline. Then the helium source injects helium into the inside of the square lithium battery through the first pipeline, and the internal environment of the detection box body can be detected through the helium detection mass spectrometer. If the square lithium battery leaks, helium will leak into the detection box body, and detection can be carried out through the helium detection mass spectrometer. After the air tightness detection is finished, the residual helium in the inside of the square lithium battery is sucked and recovered through the first vacuum instrument, and the loss of helium is reduced.
[0012] In order to better realize the utility model, further, the vacuum suction docking air nozzle assembly includes docking air nozzle, vacuum suction device, the docking air nozzle is arranged at the top center of the elastic seat component, one end of the docking air nozzle is connected with the first pipeline and the second pipeline through the three-way pipe respectively, the vacuum suction device is arranged around the docking air nozzle, and the vacuum suction device can form a vacuum environment around the docking air nozzle.
[0013] In order to better realize the utility model, further, the vacuum suction device includes a conical vacuum chuck, and the conical vacuum chuck is arranged around the outside of the docking air nozzle.
[0014] In order to better realize the utility model, further, the elastic seat component includes a support seat and a spring, a mounting groove is arranged at the top of the base, the bottom of the support seat is slidably connected with the mounting groove through a guide block, a spring is arranged between the bottom of the support seat and the bottom of the mounting groove, a threaded hole is arranged at the top of the support seat, the docking air nozzle is screwed into the threaded hole, and the bottom of the support seat and the bottom of the mounting groove are provided with pipeline perforations.
[0015] In order to better realize the utility model, further, the detection limiting frame includes a front frame body and a rear frame body arranged on the front and back sides of the lithium battery respectively, a left frame body and a right frame body arranged on the left and right sides of the lithium battery respectively, and a plurality of guide rollers are rotatably arranged on the side of the front frame body, the rear frame body, the left frame body and the right frame body close to the lithium battery.
[0016] In order to better realize the utility model, further, the top of the front frame body, rear frame body, left frame body, right frame body is provided with the guide inclined plane.
[0017] In order to better realize the utility model, further, the first vacuum instrument is connected with helium source through reflux pipeline, reflux pump is arranged on the reflux pipeline;The first vacuum instrument is connected with the external environment of detection box body through the external discharge pipeline.
[0018] In order to better realize the utility model, further, one side of the detection box body is connected with the second vacuum instrument, and the other side of the detection box body is connected with the helium mass spectrometer.
[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0020] (1) the utility model is through the docking air nozzle and the air port of the bottom of lithium battery docking, and vacuum adsorption device is arranged around the docking air nozzle, and the vacuum environment is formed around the connecting place of air port and docking air nozzle while adsorbing and fixing lithium battery, thereby avoiding helium leakage in the process of helium injection detection, also avoiding introducing additional impurity gas, and thereby guaranteeing the accuracy of lithium battery airtightness detection;
[0021] (2) the utility model can suck and recycle part of helium in lithium battery through the first vacuum instrument after airtightness detection is completed, reduces the loss of helium, and thereby reduces the cost of lithium battery airtightness detection. DRAWINGS
[0022] Figure 1 It is the structure schematic view of lithium battery airtightness detection device;
[0023] Figure 2 It is the installation schematic view of square lithium battery in detection limiting frame;
[0024] Figure 3 It is the structure schematic view of detection limiting frame;
[0025] Figure 4 It is the structure schematic view of vacuum adsorption docking air nozzle assembly.
[0026] Wherein: 1-detection box body;2-base;3-detection limiting frame;4-elastic seat assembly;5-docking air nozzle;6-vacuum adsorption device;7-helium source;8-first vacuum instrument;9-second vacuum instrument;10-helium mass spectrometer;31-front frame body;32-rear frame body;33-left frame body;34-right frame body;35-guide roller;41-supporting seat;42-spring. CONCRETE IMPLEMENTING METHOD
[0027] Example 1:
[0028] This embodiment provides a lithium battery airtightness testing device, such as... Figure 1 As shown, the device includes a detection chamber 1, a base 2 at the bottom inner side of the detection chamber 1, a detection limiting frame 3 at the top of the base 2, an elastic seat assembly 4 at the bottom of the detection limiting frame 3, and a vacuum adsorption docking nozzle assembly at the top of the elastic seat assembly 4. The vacuum adsorption docking nozzle assembly is connected to a helium source 7 through a first pipeline and to a first vacuum instrument 8 through a second pipeline. Both the first and second pipelines are equipped with solenoid valves.
[0029] The interior of the testing chamber 1 is divided into several independent chambers, each containing a base 2. A frame-structured testing limiting frame 3 is mounted on the base 2. The testing limiting frame 3 includes a front limiting surface, a rear limiting surface, a left limiting surface, and a right limiting surface. These surfaces mate with the front, rear, left, and right sides of the square lithium battery, respectively. After the square lithium battery is placed inside the testing limiting frame 3, it is positioned to ensure that the air vent at the bottom of the square lithium battery aligns with the vacuum adsorption docking nozzle assembly on the elastic seat assembly 4 at the top of the base 2. The vacuum lithium battery is then placed on top of the elastic seat assembly 4, allowing the air vent to connect with the vacuum adsorption docking nozzle assembly. Simultaneously, the vacuum adsorption docking nozzle assembly draws air from the area around the air vent into a vacuum environment, ensuring the airtightness of the subsequent helium injection process into the square lithium battery.
[0030] The airtightness testing process is as follows:
[0031] 1. After the air inlet is connected to the vacuum adsorption docking nozzle assembly, the solenoid valve on the second pipeline is opened, and the inside of the square lithium battery is drawn into a vacuum state through the first vacuum instrument 8. At the same time, the inside of the detection box 1 is drawn into a vacuum state through the vacuum instrument connected to the detection box 1.
[0032] 2. The solenoid valve on the second pipeline is closed, and the solenoid valve on the first pipeline is opened, so that helium gas is filled into the square lithium battery through helium source 7.
[0033] 3. The gas inside the detection chamber 1 is detected by a helium mass spectrometer. If there is a leak in the square lithium battery, the helium gas inside the square lithium battery will leak into the detection chamber 1, which can then be detected by the helium mass spectrometer.
[0034] 4. After the airtightness test is completed, the solenoid valve on the first pipeline is closed and the solenoid valve on the second pipeline is opened. The helium gas inside the square lithium battery is then drawn back by the first vacuum instrument 8.
[0035] Further, one side of the detection box 1 is connected with a second vacuum instrument 9, and the other side of the detection box 1 is connected with a helium detection mass spectrometer 10. Before the air tightness detection, the internal environment of the detection box 1 is pumped to a vacuum state by the second vacuum instrument 9, so as to avoid affecting the accuracy of the subsequent air tightness detection. The helium detection mass spectrometer 10 can detect whether the detection box 1 contains helium. If the detection result shows that the detection box 1 contains helium, it indicates that there is a leakage point on the square lithium battery. A sealing ring is arranged between the box door and the opening of the detection box 1, so as to ensure the air tightness of the internal environment of the detection box after the box door is closed.
[0036] Embodiment 2
[0037] The embodiment discloses a lithium battery air tightness detection device, which is improved on the basis of embodiment 1, as shown in Figure 1 and Figure 4 The vacuum adsorption butt joint air nozzle assembly includes a butt joint air nozzle 5 and a vacuum adsorption device 6. The butt joint air nozzle 5 is arranged at the top center of the elastic seat assembly 4. One end of the butt joint air nozzle 5 is connected with the first pipeline and the second pipeline through a three-way pipe respectively. The vacuum adsorption device 6 is arranged around the butt joint air nozzle 5, and can form a vacuum environment around the butt joint air nozzle 5.
[0038] After the square lithium battery is limited by the limiting frame 3, the gas port at the bottom of the square lithium battery is aligned with the butt joint air nozzle 5 at the top of the elastic seat assembly 4. The square lithium battery is placed on the top of the elastic seat assembly 4. Under the action of the self-weight of the square lithium battery and the upward elastic force of the elastic seat assembly 4, the butt joint air nozzle 5 is tightly butt jointed with the gas port at the bottom of the square lithium battery. At the butt joint interface of the butt joint air nozzle 5 and the gas port, the area around the gas port is pumped to a vacuum environment by the vacuum adsorption device 6, so as to ensure the air tightness of the butt joint structure of the butt joint air nozzle 5 and the gas port. Then, the helium can be injected into the internal of the square lithium battery through the butt joint air nozzle 5.
[0039] Further, the vacuum adsorption device 6 includes a conical vacuum chuck, which is arranged around the outside of the butt joint air nozzle 5. The conical vacuum chuck surrounds the butt joint air nozzle 5 to form a ring-shaped closed area. After the gas port is butt jointed with the butt joint air nozzle 5, the ring-shaped area around the gas port is pumped to a vacuum state by the conical vacuum chuck, so as to ensure the air tightness of the connection between the gas port and the butt joint air nozzle 5. At the same time, the square lithium battery is adsorbed and fixed by the conical vacuum chuck, so as to ensure the stability of the square lithium battery during the detection process.
[0040] The remaining parts of the embodiment are the same as those of embodiment 1, and thus will not be described here.
[0041] Embodiment 3
[0042] The embodiment discloses a lithium battery air tightness detection device, which is optimized on the basis of embodiment 1 or 2, as shown in Figure 4 The top of the base 2 is provided with a mounting groove, the bottom of the support seat 41 is in sliding connection with the mounting groove through a guide block, the spring 42 is arranged between the bottom of the support seat 41 and the bottom of the mounting groove, the top of the support seat 41 is provided with a threaded hole, the butt gas nozzle 5 is rotatably arranged in the threaded hole, and the bottom of the support seat 41 and the bottom of the mounting groove are provided with a pipeline perforation.
[0043] After the square lithium battery is placed on the top of the support seat 41, the spring 42 is compressed downward under the action of the weight of the square lithium battery, and then upward elastic force is generated. Under the action of the square lithium battery and the elastic force of the spring 42, the air port at the bottom of the square lithium battery can be more closely butted with the butt gas nozzle 5.
[0044] The bottom of the butt gas nozzle 5 is provided with a threaded sleeve, the threaded sleeve is in threaded connection with the threaded hole at the top of the support seat 41, and a sealing ring is arranged between the threaded sleeve and the threaded hole to ensure the air tightness of the connection position. The first end of the tee pipe passes through the pipeline perforation and is connected with the bottom of the butt gas nozzle 5, and the second end and the third end of the tee pipe are connected with the first pipeline and the second pipeline respectively.
[0045] The rest of the embodiment is the same as that of embodiment 1 or 2, and thus will not be described here.
[0046] Embodiment 4:
[0047] The embodiment discloses a lithium battery air tightness detection device, which is optimized on the basis of any one of embodiments 1-3, as shown in Figure 2 and Figure 3 The detection limiting frame 3 comprises a front frame body 31 and a rear frame body 32 arranged at the front and rear sides of the lithium battery respectively, and a left frame body 33 and a right frame body 34 arranged at the left and right sides of the lithium battery respectively, and a plurality of guide rollers 35 are rotationally arranged on the side close to the lithium battery of the front frame body 31, the rear frame body 32, the left frame body 33 and the right frame body 34.
[0048] The spacing between the guide rollers 35 at the front and rear sides is arranged to correspond to the thickness of the square lithium battery in the front and rear directions, and the spacing between the guide rollers 35 at the left and right sides is arranged to correspond to the width of the square lithium battery in the left and right directions. The square lithium battery is guided and the position of the square lithium battery in the front and rear directions is limited by the guide rollers 35 at the front and rear sides. Similarly, the square lithium battery is guided and the position of the square lithium battery in the left and right directions is limited by the guide rollers 35 at the left and right sides, so that the air port at the bottom of the square lithium battery can be smoothly butted with the butt gas nozzle 5.
[0049] Furthermore, the tops of the front frame 31, rear frame 32, left frame 33, and right frame 34 are all provided with guide ramps. By providing guide ramps, the opening contour at the top of the detection limiting frame 3 is larger than the outer contour of the square lithium battery, ensuring that the square lithium battery can be smoothly placed into the area between the front frame 31, rear frame 32, left frame 33, and right frame 34.
[0050] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.
[0051] Example 5:
[0052] This embodiment discloses a lithium battery airtightness testing device, which is optimized based on any one of embodiments 1-4, such as... Figure 1 As shown, the first vacuum instrument 8 is connected to the helium source 7 through a reflux pipeline, and a reflux pump is installed on the reflux pipeline; the first vacuum instrument 8 is connected to the external environment of the detection chamber 1 through an external exhaust pipeline.
[0053] Before the airtightness test, the air inside the square lithium battery is extracted using the first vacuum instrument 8. At this time, the solenoid valve on the exhaust pipe is opened, and the extracted air is discharged to the external environment of the test chamber 1 through the exhaust pipe. After the airtightness test is completed, the residual helium inside the square lithium battery is extracted and recovered using the first vacuum instrument 8. At this time, the solenoid valve on the return pipe is opened, and the return pump delivers the recovered helium to the helium source 7 through the return pipe, realizing the recovery and reuse of helium, reducing the amount of helium used, and thus reducing the cost of square lithium battery testing.
[0054] The rest of this embodiment is the same as any one of embodiments 1-4, so it will not be described again.
[0055] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A lithium battery airtightness testing device, comprising a testing chamber (1), characterized in that, The bottom inner side of the detection box (1) is provided with a base (2), the top of the base (2) is provided with a detection limiting frame (3), the bottom of the detection limiting frame (3) is provided with an elastic seat assembly (4), the top of the elastic seat assembly (4) is provided with a vacuum adsorption docking nozzle assembly, the vacuum adsorption docking nozzle assembly is connected to a helium source (7) through a first pipeline, and the vacuum adsorption docking nozzle assembly is connected to a first vacuum instrument (8) through a second pipeline. Solenoid valves are provided on both the first pipeline and the second pipeline.
2. The lithium battery airtightness testing device according to claim 1, characterized in that, The vacuum adsorption docking nozzle assembly includes a docking nozzle (5) and a vacuum adsorption device (6). The docking nozzle (5) is located at the top center of the elastic seat assembly (4). One end of the docking nozzle (5) is connected to the first pipeline and the second pipeline respectively through a three-way pipe. The vacuum adsorption device (6) is arranged around the docking nozzle (5). The vacuum adsorption device (6) can form a vacuum environment around the docking nozzle (5).
3. The lithium battery airtightness testing device according to claim 2, characterized in that, The vacuum adsorption device (6) includes a conical vacuum suction cup, which is arranged around the outside of the docking nozzle (5).
4. A lithium battery airtightness testing device according to any one of claims 1-3, characterized in that, The elastic seat assembly (4) includes a support seat (41) and a spring (42). The top of the base (2) is provided with an installation groove. The bottom of the support seat (41) is slidably connected to the installation groove through a guide block. A spring (42) is provided between the bottom of the support seat (41) and the bottom of the installation groove. The top of the support seat (41) is provided with a threaded hole. A connecting air nozzle (5) is screwed into the inside of the threaded hole. Pipe through holes are provided at the bottom of the support seat (41) and the bottom of the installation groove.
5. A lithium battery airtightness testing device according to any one of claims 1-3, characterized in that, The detection limiting frame (3) includes a front frame (31) and a rear frame (32) arranged on the front and rear sides of the lithium battery, and a left frame (33) and a right frame (34) arranged on the left and right sides of the lithium battery. Several guide rollers (35) are rotatably arranged on the side of the front frame (31), rear frame (32), left frame (33), and right frame (34) near the lithium battery.
6. The lithium battery airtightness testing device according to claim 5, characterized in that, The top of the front frame (31), rear frame (32), left frame (33), and right frame (34) are all provided with guide ramps.
7. A lithium battery airtightness testing device according to any one of claims 1-3, characterized in that, The first vacuum instrument (8) is connected to the helium source (7) through a reflux pipeline, and a reflux pump is provided on the reflux pipeline; the first vacuum instrument (8) is connected to the external environment of the detection box (1) through an external exhaust pipeline.
8. A lithium battery airtightness testing device according to any one of claims 1-3, characterized in that, A second vacuum instrument (9) is connected to one side of the detection chamber (1), and a helium mass spectrometer (10) is connected to the other side of the detection chamber (1).