Battery sealing performance detection tool

Abstract

The utility model relates to the field of battery detection, in particular to a battery sealing performance detection tool. Comprising a detection platform, a to-be-detected battery is fixed in a detection cavity of the detection platform, and the detection cavity is pressed and sealed by a gland; a detection hole is formed in the detection cavity and used for being communicated with a helium mass spectrum leak detection assembly; the charging head is inserted into a battery liquid injection port of a battery to be detected, and the charging module is communicated with the battery to be detected; a filling pipeline of the filling module is communicated with the filling head through a detection connector, and the filling pipeline is provided with a nitrogen valve, a helium valve and an evacuation valve which are alternatively communicated with the filling pipeline. According to the utility model, in the helium detection process of the battery, helium filling, detection and cleaning work can be carried out on the battery in the detection cavity, the detection efficiency is high, and the pollution degree of helium to the detection cavity is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery testing, specifically a tooling for testing battery sealing performance. Background Technology

[0002] Pre-shipment sealing testing of batteries is a crucial step in ensuring their safety, performance, and lifespan. Good sealing prevents electrolyte leakage, ensuring safety; it also isolates moisture and oxygen, maintaining electrochemical stability and internal pressure balance, thereby extending battery life. Current battery sealing testing primarily relies on helium detection, which, combined with mass spectrometry, can detect levels up to 10... ﹣12 Pa·m 3 Leakage rate at the level of / s. Existing battery sealing helium detection systems require placing the battery in a sealed cavity during testing. First, the cavity is roughly evacuated, then finely evacuated. If the residual helium level in the cavity meets the set requirements, the battery is evacuated again. The filling mechanism in the sealed cavity fills the battery injection port with helium, and the cavity vacuum pump draws gas from the cavity to a helium mass spectrometer leak detector for testing. After the test continues for a period of time, if the helium content is lower than the set requirements, the battery casing is deemed to be sealing up to standard.

[0003] After the above testing method is completed, when the battery is removed from the sealed cavity, some of the helium gas filled in the battery will leak into the sealed cavity through the injection port, causing the sealed cavity to be contaminated with helium gas and affecting subsequent battery testing. At the same time, the residual helium gas in the battery has extremely high thermal conductivity and permeability, so it needs to be sent to a separate cleaning station for helium purging before resealing after the test is completed. The entire testing process is complicated and therefore needs to be solved urgently. Utility Model Content

[0004] To avoid and overcome the technical problems existing in the prior art, this utility model provides a battery sealing test fixture. This utility model allows for helium filling, testing, and cleaning of the battery within the test chamber during the helium testing process, resulting in high testing efficiency and significantly reducing the degree of helium contamination of the test chamber.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery sealing test fixture includes a test platform, in which the battery to be tested is fixed in a test chamber of the test platform and the test chamber is sealed by a pressure cap; the test chamber has a test hole for communication with a helium mass spectrometer leak detection component; a filling head is inserted into the battery filling port of the battery to be tested, connecting the filling module to the battery to be tested; the filling pipeline of the filling module is connected to the filling head through a test connector, and the filling pipeline is equipped with a nitrogen valve, a helium valve, and a vacuum valve that are selectively connected to the filling pipeline.

[0007] As a further embodiment of this utility model: the testing platform is provided with a filling port arranged coaxially with the battery filling port for the filling head to be inserted, and the contact surface between the filling head and the filling port is sealed.

[0008] As a further embodiment of this utility model, it also includes a mounting base arranged at intervals from the testing platform. The mounting base is provided with a filling rod that is driven by a filling cylinder and thus travels linearly along the axis of the battery filling port of the battery under test. The filling head is fixed to the end of the filling rod.

[0009] As a further embodiment of this utility model: a pressure plate is provided between the mounting base and the testing platform. The sealing cylinder on the mounting base drives the pressure plate to move linearly along the axis of the battery filling port. The plate body is arranged perpendicular to the axis of the battery filling port. A sealing head is installed on the pressure plate and is coaxially sleeved on the outer ring of the filling rod. The sealing head is made of an elastic material that can be deformed after being squeezed. The diameter of the sealing head is larger than the diameter of the filling port of the testing platform.

[0010] As a further improvement of this utility model: a guide rod is provided between the mounting base and the testing platform, which is arranged parallel to the filling rod, and the pressure plate slides along the straight line of the guide rod.

[0011] As a further improvement of this utility model, a positioning groove corresponding to the size of the battery to be tested is provided at the bottom of the detection chamber, and the battery to be tested is snapped into the positioning groove.

[0012] As a further improvement of this utility model: the nitrogen valve is connected to the nitrogen source through the nitrogen source interface, the evacuation valve is connected to the vacuum pump through the vacuum pump interface, and the helium valve is connected to the helium source through the helium source interface.

[0013] As a further improvement of this invention, a vacuum gauge is installed on the testing platform to monitor the vacuum level inside the testing chamber.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model connects the filling head to the filling module. The filling pipeline in the filling module integrates nitrogen filling, helium filling and vacuuming functions. After switching the connection mode, the battery under test can be subjected to vacuuming-helium filling-vacuuming-nitrogen filling and other operations in sequence. The helium mass spectrometry leak detection component also integrates pre-vacuuming, nitrogen purging and helium detection functions, reducing manual switching steps and shortening the detection cycle. During the battery helium detection process, the battery can be filled with helium, detected and cleaned in the detection chamber. The detection efficiency is high and the degree of helium contamination in the detection chamber is greatly reduced.

[0016] 2. The filling head and battery filling port of this utility model adopt a sealed design, which, together with the elastic sealing head, further prevents external gas from seeping in and improves the sensitivity of helium detection; the linear slide rail and the filling cylinder drive the filling head to accurately position, realize automated insertion and removal, reduce manual intervention, and the guide rod ensures the stable movement of the pressure plate and sealing head, avoiding deviation that leads to poor sealing.

[0017] 3. The bottom of the detection chamber of this utility model is provided with a positioning groove, which can be used to snap and position the battery, thereby enhancing the positioning accuracy during the battery detection process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the filling module in this utility model.

[0020] Figure 3 This is a schematic diagram of the helium detection system used in this utility model.

[0021] In the picture:

[0022] 1. Testing platform; 11. Testing chamber; 12. Battery to be tested; 13. Positioning slot; 14. Testing hole;

[0023] 2. Mounting base; 21. Charging cylinder; 22. Sealing cylinder; 23. Pressure plate; 24. Guide rod;

[0024] 25. Filling rod; 26. Sealing head; 27. Filling head;

[0025] 3. Filling module; 31. Testing connector; 32. Filling pipeline;

[0026] 33. Nitrogen valve; 331. Nitrogen source interface; 34. Vacuum valve; 341. Vacuum pump interface;

[0027] 35. Helium valve; 351. Helium source interface;

[0028] 4. Base; 41. Linear slide rail; 42. Sliding seat; 43. Vertical guide column; 44. Lifting cylinder;

[0029] 5. Capping; 51. Vent nozzle; 6. Helium mass spectrometer leak detection assembly. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-3 In this embodiment of the utility model, a battery sealing test fixture includes multiple test platforms 1 arranged side by side on a base 4. Two test chambers 11 are symmetrically arranged on the test platform 1. The valve island of the base 4 is provided with mounting seats 2 corresponding to the number of test platforms 1.

[0032] The testing chamber 11 has a positioning groove 13, which corresponds to the size of the battery 12 under test. The battery 12 under test is snapped into the positioning groove 13 from top to bottom for positioning. The testing platform 1 has two sets of filling ports, which are coaxially arranged with the battery filling port of the corresponding battery 12 under test, and are usually larger than the battery filling port to accommodate batteries of different sizes.

[0033] Multiple sets of support columns are provided on the base 4 to suspend and support the testing platform 1 from bottom to top. A vacuum gauge is provided at the bottom of the testing platform 1 to monitor the vacuum level inside the testing chamber 11. When the battery model changes, the filling head of the testing chamber 11 can be located at the bottom of the testing platform 1, and the positions of each testing component will change accordingly.

[0034] The mounting base 2 is equipped with a charging cylinder 21 corresponding to the positions of the two sets of detection chambers 11. The drive end of the charging cylinder 21 is arranged axially along the charging port. A charging rod 25 is coaxially fixed to the drive end of the charging cylinder 21. A charging head 27 is detachably fixed to the end of the charging rod 25. The size of the charging head 27 corresponds to the battery filling port of the battery under test 12. After passing through the charging port, the charging head 27 enters the detection chamber 11 and is inserted and positioned with the battery under test 12. A sealing ring can be provided on the outer ring of the charging head 27 to ensure a complete seal between the charging head 27 and the battery filling port interface of the battery under test 12.

[0035] A guide rod 24 is provided between the mounting base 2 and the testing platform 1, which is arranged parallel to the filling rod 25. Two sets of guide rods 24 are symmetrically arranged. The two sets of guide rods 24 pass through the pressure plate 23 at the same time. The pressure plate 23 slides linearly with the guide rod 24 along the rod body.

[0036] A sealing cylinder 22 is also installed on the mounting base 2 between the two guide rods 24. The driving end of the sealing cylinder 22 is arranged parallel to the guide rods 24 and is connected to the pressure plate 23 to drive the pressure plate 23 to slide along the guide rods 24. A sealing head 26 is coaxially arranged on the pressure plate 23 and sleeved on the outer ring of the filling rod 25. The sealing head 26 is preferably an elastic rubber head with a diameter larger than that of the filling head 27. The sealing head 26 is located between the pressure plate 23 and the filling head 27. When the sealing head 26 is squeezed by the pressure plate 23 and the detection platform 1, it undergoes elastic deformation, thereby sealing the gap between the filling head 27 and the filling port, so that the detection chamber 11 is isolated from the outside air.

[0037] The filling head 27 is connected to the filling module 3 via a bent-type detection connector 31. The filling module 3 contains a filling pipeline 32 connected to the detection connector 31. The filling pipeline 32 is equipped with a nitrogen valve 33, a helium valve 35, and a vacuum valve 34. The nitrogen valve 33, helium valve 35, and vacuum valve 34 are selectively connected to the filling pipeline 32, allowing for selective filling of the battery under test 12 with helium, nitrogen, or vacuum treatment. The nitrogen valve 33 is connected to a nitrogen source via a nitrogen source interface 331, the vacuum valve 34 is connected to a vacuum pump via a vacuum pump interface 341, and the helium valve 35 is connected to a helium source via a helium source interface 351.

[0038] A detection hole 14 is provided on the side of the detection chamber 11 away from the filling port, and the detection hole 14 is used to connect to the helium mass spectrometry leak detection assembly 6. The helium mass spectrometry leak detection assembly includes a pre-vacuum connection, a nitrogen purging connection, and a helium mass spectrometry leak detection connection. The pre-vacuum connection, the nitrogen purging connection, and the helium mass spectrometry leak detection connection are respectively connected to the vacuum pump, the nitrogen source, and the helium mass spectrometer leak detector. A baffle valve allows one of the three sets of connections to be connected to the detection chamber 11. In this embodiment, each helium mass spectrometer leak detector is connected to one of the two sets of detection chambers 11 on the two sets of detection platforms 1, and the two sets of detection chambers 11 are detected alternately.

[0039] Each testing platform 1 has symmetrically arranged linear slide rails 41 on both sides, which are arranged along the axis parallel to the filling head 27. A lifting cylinder 44 is installed on the sliding seat 42 of the linear slide rail 41. The pressure cap 5 is driven to rise and fall by the lifting cylinder 44 to press and seal each testing chamber 11 on the testing platform 1. To make the rising and falling more stable, vertical guide columns 43 are symmetrically arranged on both sides of the lifting cylinder 44 on the sliding seat 42. The bottom of the pressure cap 5 slides vertically with the vertical guide columns 43 through a linear bearing.

[0040] The bottom of the pressure cap 5 is equipped with a pressure block corresponding to the size and position of the battery 12 under test. When the pressure cap 5 presses down to seal the detection chamber 11, the pressure block simultaneously presses down and fixes the battery 12 under test. The top of the pressure cap 5 is equipped with a flat, funnel-shaped exhaust nozzle 51, which is arranged parallel to the detection platform 1. The intake of the exhaust nozzle 51 gradually narrows along the direction away from the detection platform 1. After the test is completed, the exhaust nozzle 51 is activated to remove any helium gas that may remain in the detection chamber 11 and the surrounding air.

[0041] The testing process includes the following steps:

[0042] The robotic arm places the battery 12 to be tested into the testing chamber 11. After placement, the robotic arm rises, and the sliding seat moves the pressure cap 5 to directly above the testing platform 1. The pressure cap 5 then descends to seal the testing chamber 11. The filling head 27 is inserted into the electrolyte inlet of the battery 12, and the sealing pressure head 26 presses the filling head 27 tightly to seal it. The filling head first evacuates the battery 12, and the sealed chamber 12 is simultaneously evacuated. After evacuation, helium is injected into the battery 12, and a helium mass spectrometer leak detector checks for leaks in the sealed chamber 11. After leak detection, the battery 12 is evacuated again, and nitrogen gas is injected to ventilate the chamber. Nitrogen gas is simultaneously injected into the sealed chamber 11 to ventilate the chamber. The test is complete, the pressure cap 5 moves upward, and the battery 12 is removed, ready for the next set of batteries to be tested.

[0043] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0044] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. A battery sealing performance testing fixture, characterized in that, The test platform (1) is included. The battery under test (12) is fixed in the test chamber (11) of the test platform (1). The test chamber (11) is sealed by the pressure cap. The test chamber (11) is provided with a test hole (14) for communication with the helium mass spectrometer leak detection component. The filling head (27) is inserted into the battery liquid injection port of the battery under test (12) to connect the filling module (3) with the battery under test (12). The filling pipeline (32) of the filling module (3) is connected to the filling head (27) through the test connector (31). The filling pipeline (32) is provided with a nitrogen valve (33), a helium valve (35) and an evacuation valve (34) that are selectively connected to the filling pipeline (32).

2. The battery sealing performance testing fixture according to claim 1, characterized in that, The testing platform (1) has a filling port arranged coaxially with the battery filling port for the filling head (27) to be inserted. The contact surface between the filling head (27) and the filling port is sealed.

3. The battery sealing performance testing fixture according to claim 2, characterized in that, It also includes a mounting base (2) spaced apart from the testing platform (1). The mounting base (2) is provided with a filling rod (25) driven by a filling cylinder (21) and thus moving in a straight line along the direction of the battery filling port axis of the battery to be tested (12). The filling head (27) is fixed to the end of the filling rod (25).

4. The battery sealing performance testing fixture according to claim 3, characterized in that, A pressure plate (23) is provided between the mounting base (2) and the testing platform (1). The sealing cylinder (22) on the mounting base (2) drives the pressure plate (23) to move in a straight line along the axis of the battery filling port. The plate body of the pressure plate (23) is arranged perpendicular to the axis of the battery filling port. A sealing head (26) is installed on the pressure plate (23) and is coaxially sleeved on the outer ring of the filling rod (25). The sealing head (26) is an elastic material that can be deformed after being squeezed. The diameter of the sealing head (26) is larger than the diameter of the filling port of the testing platform (1).

5. The battery sealing performance testing fixture according to claim 4, characterized in that, A guide rod (24) is provided between the mounting base (2) and the testing platform (1) and is arranged parallel to the filling rod (25). The pressure plate (23) slides along the straight line of the guide rod (24).

6. A battery sealing performance testing fixture according to any one of claims 1 to 5, characterized in that, The bottom of the detection chamber (11) is provided with a positioning groove (13) corresponding to the size of the battery (12) to be tested, and the battery (12) to be tested is snapped into the positioning groove (13).

7. A battery sealing performance testing fixture according to any one of claims 1 to 5, characterized in that, The nitrogen valve (33) is connected to the nitrogen source through the nitrogen source interface (331), the evacuation valve (34) is connected to the vacuum pump through the vacuum pump interface (341), and the helium valve (35) is connected to the helium source through the helium source interface (351).

8. A battery sealing performance testing fixture according to any one of claims 1 to 5, characterized in that, A vacuum gauge is installed on the testing platform (1) to monitor the vacuum level inside the testing chamber.

Images