Lithium ion battery sealing performance testing device
Through the device of a vacuum drying box and a spherical chilled hydrazine tube combined with a vacuum pump and a gas chromatographic mass spectrometer, the problem of inaccurate seal detection of lithium-ion batteries in the prior art is solved, and the accurate evaluation of battery sealing is achieved, ensuring the sealing and safety of the battery in long-term use.
Patent Information
- Application Number
- CN202422451221.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-11
AI Technical Summary
The existing lithium-ion battery sealing detection device cannot accurately evaluate the welding effect of sealing nails, resulting in inaccurate test results and ineffective guarantee of the sealing of the battery.
A lithium-ion battery sealing performance testing device was designed. A vacuum drying box and a spherical chilled hydrazine tube were combined with a vacuum pump and a gas chromatographic mass spectrometer. The vacuum pump formed a negative pressure state, and the electrolyte in the battery was pumped into the spherical chilled hydrazine tube and condensed in a liquid nitrogen bath. Qualitative testing was performed using a gas chromatographic mass spectrometer to evaluate the sealing properties of the battery.
Accurate evaluation of the sealing properties of lithium-ion batteries is achieved, testing errors caused by poor sealing nail welding are avoided, ensuring that the battery has good sealing properties during long-term use, and preventing moisture from entering affecting performance and safety.
Smart Images
Figure CN223217043U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery sealing performance testing, in particular to a lithium ion battery sealing performance testing device. Background Art
[0002] Lithium-ion batteries have become a core component in various electronic products and electric vehicles over the past few years. With their widespread use, battery safety incidents have been constantly at the forefront of public opinion. The safety performance of lithium-ion batteries is affected by many factors, among which the battery's sealing plays a key role.
[0003] The sealing performance of lithium-ion batteries is mainly reflected in the following aspects: the reliability of the pole sealing of the top cover plate; the sealing reliability of the weld between the shell and the cover; the sealing reliability of the sealing pin welding; the sealing method between the pole and the shell is compression sealing, that is, the pole and the shell are isolated by a compressible plastic part, and the plastic seal is squeezed in a certain way to produce a certain degree of compression to achieve sealing and insulation between the pole and the shell; the sealing pin welding is usually made of aluminum material, covering the injection hole, and is sealed and connected to the battery cover by welding to ensure the sealing safety and reliability of the battery.
[0004] These products with compromised sealing properties won't significantly impact battery performance in the short term. However, over long-term use, moisture from the air slowly enters the battery, severely impacting its performance. In severe cases, this can lead to failure of the entire battery pack, or even thermal runaway accidents. Therefore, lithium-ion batteries must be tested for sealing properties using testing equipment before both filling and assembly to ensure that all products meet sealing requirements.
[0005] The current detection mode is helium inspection, which is performed after the aluminum shell and the top cover are welded. The welding effect of the sealing pins cannot be guaranteed, and the welding effect can only be predicted by observing the welding first piece test. The test results are not accurate.
[0006] Based on this, a lithium-ion battery sealing performance testing device is now provided, which can eliminate the disadvantages of existing devices. Utility Model Content
[0007] In view of the above problems, a lithium-ion battery sealing performance testing device is provided, which solves the problem of inaccurate testing by performing qualitative testing on the substances collected in the spherical cold hydrazine tube using a gas chromatography-mass spectrometer (GC-MS).
[0008] To solve the problems of the prior art, the utility model provides a lithium-ion battery sealing performance testing device, comprising a vacuum drying oven, a Dewar tank being provided on one side of the vacuum drying oven, a spherical cold hydrazine tube being clamped and fixed on the Dewar tank by a clamping mechanism, the spherical cold hydrazine tube and the Dewar tank being sealed at the joint by a quick-insert mechanism, a first docking port and a second docking port being provided on the spherical cold hydrazine tube, a second connecting pipe being provided on the vacuum drying oven, the other end of the second connecting pipe being docked with the first docking port by a quick-insert mechanism, a vacuum pump body being provided on one side of the Dewar tank, a first connecting pipe being provided at the output end of the vacuum pump body, the other end of the first connecting pipe being docked with the second docking port by a quick-insert mechanism.
[0009] Preferably, the clamping mechanism includes a rotating disk, a screw rod, a guide rod, a movable clamp block, a fixed clamp block, a mounting plate and a fixed plate. The Dewar tank is provided with a mounting plate, and a fixed clamp block is fixedly mounted on the side wall of the mounting plate. The side wall of the mounting plate is symmetrically provided with a guide rod, and the movable clamp block is slidably arranged on the guide rod and cooperates with the fixed clamp block. A fixed plate is fixed on the guide rod, and one end of the rotating disk is connected to the screw rod near the fixed plate, and the other end of the screw rod passes through the side wall of the fixed plate and rotates with the movable clamp block. A thread that cooperates with the screw rod is provided inside the fixed plate.
[0010] Preferably, the quick-insertion mechanism includes a first fixing ring, a sliding ring, a positioning rod, a second fixing ring and a docking hole. The second connecting tube and the first connecting tube are both provided with a first fixing ring at one end close to the spherical cold hydrazine tube, and the first docking interface and the second docking interface are both provided with a second fixing ring at one end away from the spherical cold hydrazine tube. The second fixing ring is provided with a plurality of docking holes, and a sliding ring is provided on the outer sliding sleeve of the first fixing ring. The sliding ring is provided with a plurality of positioning rods that cooperate with the docking holes.
[0011] Preferably, a glass panel is rotatably provided on the vacuum drying oven, a handle is provided on the outer wall of the glass panel, a temperature display panel is provided on the side of the glass panel away from the handle, a sealing rubber ring is provided on the surface of the glass panel in contact with the vacuum drying oven, and an exhaust port and a vacuum pump start switch are provided on the vacuum pump body.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] 1. The utility model forms a negative pressure state in the entire system through the vacuum pump body, and heats the battery through a vacuum drying oven. If the battery has poor sealing, the electrolyte in the battery will be drawn into the spherical cold hydrazine tube along the pipeline. Under the condensation effect of the liquid nitrogen bath, the gas inside the battery is liquefied or condensed and stored in the spherical cold hydrazine tube. The material collected in the spherical cold hydrazine tube is then subjected to a gas chromatography-mass spectrometer (GC-MS) qualitative test to determine whether there are electrolyte components therein, thereby evaluating whether the battery has poor sealing. This avoids the problem of testing after the aluminum shell and the top cover are welded, which may result in inaccurate testing due to the inability to ensure the welding of the sealing nails.
[0014] 2. The utility model provides a clamping mechanism to fix the spherical cold hydrazine tube on the Dewar tank through the cooperation of a fixed clamping block and a movable clamping block, which makes it easy to remove or install the spherical cold hydrazine tube and facilitates the operation of the staff.
[0015] 3. The utility model can realize the rapid docking of the first connecting tube and the second pair of interfaces as well as the second connecting tube and the first pair of interfaces by setting a quick plug mechanism. It only needs to align them in sequence and slide the sliding ring so that the positioning rod is inserted into the docking hole, which can be sealed and facilitate the docking operation of the staff. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a lithium-ion battery sealing performance testing device.
[0017] Figure 2 It is a lithium-ion battery sealing performance test device Figure 1 Schematic diagram of the partially enlarged three-dimensional structure of A in the middle.
[0018] Figure 3 It is a schematic diagram of the partial three-dimensional structure of a lithium-ion battery sealing performance testing device.
[0019] 10. The numbers in the figure are: 101, vacuum drying oven; 102, temperature display panel; 103, glass panel; 104, handle; 105, vacuum pump body; 106, exhaust port; 107, vacuum pump start switch; 108, Dewar tank; 109, spherical cold hydrazine tube; 110, first connecting pipe; 111, second connecting pipe; 112, first pair of interfaces; 113, second pair of interfaces; 114, sealing rubber ring; 200, clamping mechanism; 201, rotating disk; 202, screw rod; 203, guide rod; 204, movable clamp block; 205, fixed clamp block; 206, mounting plate; 207, fixed plate; 300, quick-insertion mechanism; 301, first fixing ring; 302, sliding ring; 303, positioning rod; 304, second fixing ring; 305, docking hole. DETAILED DESCRIPTION
[0020] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is described in further detail below in conjunction with the accompanying drawings and specific implementation methods.
[0021] Reference Figure 1-Figure 3 : A lithium-ion battery sealing performance testing device, comprising a vacuum drying oven 101, a Dewar tank 108 is provided on one side of the vacuum drying oven 101, a spherical cold hydrazine tube 109 is clamped and fixed on the Dewar tank 108 by a clamping mechanism 200, the spherical cold hydrazine tube 109 and the Dewar tank 108 are sealed at the docking point by a quick plug mechanism 300, a first docking port 112 and a second docking port 113 are provided on the spherical cold hydrazine tube 109, the vacuum drying oven 101 is provided with a second connecting pipe 111, the other end of the second connecting pipe 111 is docked with the first docking port 112 through a quick plug mechanism 300, a vacuum pump body 105 is provided on one side of the Dewar tank 108, the output end of the vacuum pump body 105 is provided with a first connecting pipe 110, the other end of the first connecting pipe 110 is docked with the second docking port 113 through a quick plug mechanism 300.
[0022] The battery is placed in a vacuum drying oven 101, and the entire system is in a negative pressure state through the vacuum pump body 105. The battery is heated by the vacuum drying oven 101. If the battery sealing is poor, the electrolyte in the battery will be drawn into the spherical cold hydrazine tube 109 along the pipeline. Under the condensation effect of the liquid nitrogen bath, the gas inside the battery is liquefied or condensed and stored in the spherical cold hydrazine tube 109. The material collected in the spherical cold hydrazine tube 109 is then subjected to a gas chromatography-mass spectrometer (GC-MS) qualitative test to determine whether there are electrolyte components therein, thereby evaluating whether the battery has poor sealing. This avoids the test after the aluminum shell and the top cover are welded, and the phenomenon of inaccurate test due to the inability to ensure the welding of the sealing pins is avoided. The vacuum pump body 105 is used to ensure that the entire test system is in a negative pressure state. The spherical cold hydrazine tube 109 uses a spherical cold hydrazine structure with a large spherical contact area, which plays the role of condensing vapor and condensing droplets. The function of the Dewar tank 108 is to have built-in liquid nitrogen to provide a low-temperature system.
[0023] Reference Figure 1-Figure 2: The clamping mechanism 200 includes a rotating disk 201, a screw rod 202, a guide rod 203, a movable clamp block 204, a fixed clamp block 205, a mounting plate 206 and a fixed plate 207. The Dewar tank 108 is provided with a mounting plate 206, and the fixed clamp block 205 is fixedly installed on the side wall of the mounting plate 206. The guide rod 203 is symmetrically provided on the side wall of the mounting plate 206. The movable clamp block 204 is slidably set on the guide rod 203 and cooperates with the fixed clamp block 205. A fixed plate 207 is fixed on the guide rod 203. One end of the rotating disk 201 close to the fixed plate 207 is connected to the screw rod 202, and the other end of the screw rod 202 passes through the side wall of the fixed plate 207 and rotates with the movable clamp block 204. A thread that cooperates with the screw rod 202 is provided inside the fixed plate 207.
[0024] The connection between the spherical cold hydrazine tube 109 and the Dewar tank 108 is sealed by a sealing ring. The spherical cold hydrazine tube 109 is inserted into the docking position. The screw rod 202 is driven to rotate by rotating the rotating disk 201. The screw rod 202 cooperates with the fixed plate 207 to drive the movable clamping block 204 to move toward the spherical cold hydrazine tube 109 and cooperates with the fixed clamping block 205 to fix and clamp the spherical cold hydrazine tube 109. The surfaces where the movable clamping block 204 and the fixed clamping block 205 contact the spherical cold hydrazine tube 109 are provided with rubber pads to avoid unnecessary damage to 100 caused by excessive force.
[0025] Reference Figure 1-Figure 3 : The quick-insertion mechanism 300 includes a first fixing ring 301, a sliding ring 302, a positioning rod 303, a second fixing ring 304 and a docking hole 305. The second connecting tube 111 and the first connecting tube 110 are both provided with a first fixing ring 301 at one end close to the spherical cold hydrazine tube 109, and the first docking port 112 and the second docking port 113 are both provided with a second fixing ring 304 at one end away from the spherical cold hydrazine tube 109. The second fixing ring 304 is provided with a plurality of docking holes 305. The sliding sleeve of the outer periphery of the first fixing ring 301 is provided with a sliding ring 302, and the sliding ring 302 is provided with a plurality of positioning rods 303 that cooperate with the docking holes 305.
[0026] When it is necessary to dock the second connecting pipe 111 with the first docking port 112 and the first connecting pipe 110 with the second docking port 113, they are aligned respectively. The pipe diameters of the first docking port 112 and the second docking port 113 are smaller than the diameters of the second connecting pipe 111 and the first connecting pipe 110. The first docking port 112 and the second docking port 113 are respectively inserted into the second connecting pipe 111 and the first docking port 112. The sliding ring 302 is driven to drive the positioning rod 303 on the sliding ring 302 to be inserted into the docking hole 305. The contact surface of the sliding ring 302 and the second fixing ring 304 is provided with a sealing ring to play a sealing role.
[0027] Reference Figure 1: A glass panel 103 is rotatably provided on the vacuum drying oven 101, a handle 104 is provided on the outer wall of the glass panel 103, a temperature display panel 102 is provided on the side of the glass panel 103 away from the handle 104, a sealing rubber ring 114 is provided on the surface of the glass panel 103 in contact with the vacuum drying oven 101, and an exhaust port 106 and a vacuum pump start switch 107 are provided on the vacuum pump body 105.
[0028] Pulling the handle 104 facilitates opening the glass panel 103 to place the battery. The temperature display panel 102 is used to display the temperature inside the vacuum drying box 101. Turning on the vacuum pump start switch 107 can start the vacuum pump body 105, so that the entire test system is in a negative pressure state. The function of the sealing rubber ring 114 is to ensure the sealing of the entire drying box.
[0029] Working principle: Pull the handle 104, place the battery in the vacuum drying oven 101 and close the glass panel 103 to seal the vacuum drying oven 101, insert the first docking port 112 and the second docking port 113 into the second connecting pipe 111 and the first docking port 112 respectively, slide the sliding ring 302, drive the positioning rod 303 on the sliding ring 302 to insert into the docking hole 305 so that the docking joint is quickly docked and sealed, and the screw rod 202 is driven to rotate by rotating the rotating disk 201. The screw rod 202 cooperates with the fixed plate 207 to drive the movable clamp 204 to move toward the spherical cold hydrazine tube 109 and cooperates with the fixed clamp 205 to fix and clamp the spherical cold hydrazine tube 109, and press The vacuum pump start switch 107 starts the vacuum pump body 105 to form a negative pressure state in the entire system, and the battery is heated by the vacuum drying oven 101. If the battery has poor sealing, the electrolyte in the battery will be drawn into the spherical cold hydrazine tube 109 along the pipeline. Under the condensation effect of the liquid nitrogen bath, the gas inside the battery is liquefied or condensed and stored in the spherical cold hydrazine tube 109. The material collected in the spherical cold hydrazine tube 109 is then subjected to a gas chromatography-mass spectrometer (GC-MS) qualitative test to determine whether there are electrolyte components therein, thereby evaluating whether the battery has poor sealing. This avoids the problem of testing after the aluminum shell and the top cover are welded, which may result in inaccurate testing due to the inability to ensure the welding of the sealing pins.
[0030] The above embodiments merely represent one or several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.
Claims
1. A lithium-ion battery sealing performance testing device, characterized in that: The invention comprises a vacuum drying box (101), wherein a dewar tank (108) is provided on one side of the vacuum drying box (101), a spherical cold hydrazine tube (109) is clamped and fixed on the dewar tank (108) by a clamping mechanism (200), the joint between the spherical cold hydrazine tube (109) and the dewar tank (108) is sealed by a quick plug mechanism (300), the spherical cold hydrazine tube (109) is provided with a first docking port (112) and a second docking port (113), and the vacuum drying box (101) is provided with a dewar tank (108) and a first docking port (112) and a second docking port (113). The empty drying box (101) is provided with a second connecting pipe (111), the other end of which is connected to a first docking port (112) via a quick-insertion mechanism (300); a vacuum pump body (105) is provided on one side of the Dewar tank (108); a first connecting pipe (110) is provided at the output end of the vacuum pump body (105); the other end of which is connected to a second docking port (113) via a quick-insertion mechanism (300).
2. A lithium-ion battery sealing performance testing device according to claim 1, characterized in that: The clamping mechanism (200) comprises a rotating disk (201), a screw rod (202), a guide rod (203), a movable clamping block (204), a fixed clamping block (205), a mounting plate (206) and a fixed plate (207); the Dewar jar (108) is provided with a mounting plate (206); the fixed clamping block (205) is fixedly mounted on the side wall of the mounting plate (206); the guide rod (203) is symmetrically provided on the side wall of the mounting plate (206); the movable clamping block (204) is provided with a fixed clamping block (205); the fixed clamping block (205) is fixedly mounted ... The clamping block (204) is slidably arranged on the guide rod (203) and cooperates with the fixed clamping block (205); a fixed plate (207) is fixedly provided on the guide rod (203); one end of the rotating disk (201) close to the fixed plate (207) is connected to the screw rod (202); the other end of the screw rod (202) passes through the side wall of the fixed plate (207) and rotates with the movable clamping block (204); a thread that cooperates with the screw rod (202) is provided inside the fixed plate (207).
3. A lithium-ion battery sealing performance testing device according to claim 1, characterized in that: The quick-insertion mechanism (300) includes a first fixed ring (301), a sliding ring (302), a positioning rod (303), a second fixed ring (304) and a docking hole (305). The second connecting tube (111) and the first connecting tube (110) are both provided with a first fixed ring (301) at one end close to the spherical cold hydrazine tube (109). The first docking port (112) and the second docking port (113) are both provided with a second fixed ring (304) at one end away from the spherical cold hydrazine tube (109). The second fixed ring (304) is provided with a plurality of docking holes (305). The sliding ring (302) is provided on the outer sliding sleeve of the first fixed ring (301). The sliding ring (302) is provided with a plurality of positioning rods (303) that cooperate with the docking holes (305).
4. A lithium-ion battery sealing performance testing device according to claim 1, characterized in that: A glass panel (103) is rotatably provided on the vacuum drying box (101), a handle (104) is provided on the outer wall of the glass panel (103), a temperature display panel (102) is provided on the side of the glass panel (103) away from the handle (104), a sealing rubber ring (114) is provided on the surface of the glass panel (103) in contact with the vacuum drying box (101), and an exhaust port (106) and a vacuum pump start switch (107) are provided on the vacuum pump body (105).