Lithium battery auxiliary device

Abstract

The utility model discloses a lithium battery auxiliary device which comprises a helium charging mechanism and a helium detection restraining tool. The helium filling mechanism comprises a back support, a bottom fixing block, an upper fixing clamping jaw hand and a helium filling device. A T-shaped vertical sliding platform is installed on the back support, the upper portion of the T-shaped vertical sliding platform is connected with a helium filling device, and the lower portion of the T-shaped vertical sliding platform is connected with an upper fixed clamping jaw hand. The bottom fixing block is used for fixing a battery cell, and the upper fixing clamping jaw hand is used for grabbing and fixing the battery cell and filling helium into the battery cell through the helium filling device; the helium filling device comprises a helium filling auxiliary device and a helium tank, and the helium filling auxiliary device and the helium tank are connected through a gas inlet pipe; and the helium detection restraining tool is used for fixing the battery cell after helium filling of the battery cell is finished, and carrying out vacuum leakage detection on the battery cell through a helium detector. According to the utility model, developed cells with different design sizes can be matched to the greatest extent, and helium filling and helium detection assistance can be carried out on the cells in a small-scale test stage.

Description

Technical Field

[0001] The utility model relates to a battery helium detection auxiliary device, in particular to a lithium battery auxiliary device. Background Art

[0002] With the continuous development of new energy in today's society, the production process of lithium batteries is also being continuously optimized. The classification of lithium-ion batteries mainly includes soft packs, square shells and cylinders. Square shell batteries have become the key products of many companies due to their good sealing, good safety, high reliability and high energy density. There are many welding processes in the assembly process of square shell batteries, including ultrasonic welding and laser welding, facing the pole ears, poles and shells. Each welding process will have targeted quality control. Among them, the welding process closely related to the sealing of the square shell is the peripheral welding of the shell. In order to verify the effect of the peripheral welding, in addition to the need to detect the depth and width of the welding, pressure testing and shell leakage experience are also required. Regarding shell leakage experience, the most popular one is helium detection, which has high detection efficiency and detection accuracy, but the helium detection device is often more complicated. In addition to the helium detector, it is also necessary to have a helium filling pipeline, a detection cavity, a vacuum pump and a vacuum pipeline, a nitrogen source and a nitrogen pipeline, a helium detector, etc. When square-shell battery cells are in the pilot stage of development, helium testing cannot be carried out effectively because the design size or structure is different from the mass-produced model. This will undoubtedly reduce the accuracy and precision of the helium test, resulting in misjudgment and omission of pilot products, and safety problems will also arise after defective products are discharged. Utility Model Content

[0003] Purpose of the utility model: The utility model aims to provide a lithium battery auxiliary device, which can match the development cells of different design sizes to the maximum extent, and assist in helium filling and helium inspection of the cells in the pilot stage.

[0004] Technical solution: The utility model discloses a lithium battery auxiliary device, comprising a helium filling mechanism and a helium detection restraint tool; the helium filling mechanism comprises a back support, a bottom fixing block, an upper fixed gripper and a helium filling device; a T-shaped vertical sliding platform is installed on the back support, the upper part of the T-shaped vertical sliding platform is connected with the helium filling device, and the lower part is connected with the upper fixed gripper; the bottom fixing block is used to fix the battery cell, and the upper fixed gripper is used to grab and fix the battery cell and fill the battery cell with helium through the helium filling device; the helium filling device comprises a helium filling auxiliary device and a helium cylinder, and the helium filling auxiliary device and the helium cylinder are connected through an air inlet pipe; the helium detection restraint tool is used to fix the battery cell after the helium filling of the battery cell is completed, and the battery cell is vacuum leak tested by a helium detector.

[0005] Furthermore, the helium filling auxiliary device includes silicone oil, a U-shaped exhaust pipe, a piston and a piston shaft, an empty barrel, an empty barrel loading opening valve, a formation process nail, an air intake pipe 1, an air pipe PU joint and an empty barrel leather sleeve; the empty barrel is provided with a piston and a piston shaft, an empty barrel loading opening valve, a formation process nail and an empty barrel leather sleeve from top to bottom; the empty barrel is respectively connected to the U-shaped exhaust pipe and the air intake pipe 1; silicone oil is provided in the U-shaped exhaust pipe; the air intake pipe 1 is connected to the air intake pipe through the air pipe PU joint.

[0006] Furthermore, the upper fixed clamping jaw hand includes an upper clamping jaw 1; the upper clamping jaw 1 is installed on the T-shaped vertical sliding platform through an upper clamping jaw 1 positioning bolt and an upper clamping jaw 2 positioning bolt.

[0007] Furthermore, the bottom fixing block includes a helium filling device base, a front positioning limit block is installed on the helium filling device base through positioning bolts, a positioning clamp is installed on the front positioning limit block, and the positioning clamp is used to fix the battery cell.

[0008] Furthermore, a pressure reducing valve or an air gun is provided at the connection between the air inlet pipe and the helium cylinder.

[0009] Furthermore, the T-shaped vertical sliding platform includes a sliding mechanism and a platform, and the sliding mechanism is a screw or a slider.

[0010] Furthermore, the air intake pipe is made of acrylic material.

[0011] Furthermore, a spring is connected inside a positioning bolt of the upper clamping jaw.

[0012] Furthermore, the helium inspection restraint tooling includes a restraint tooling base, a fixed clamping plate is provided on the restraint tooling base, two movable clamping plates and two screw brackets are symmetrically provided on both sides of the fixed clamping plate, and restraint tooling screws are fixed in the two screw brackets; the battery cell is fixed by the movable clamping plate and the fixed clamping plate.

[0013] Furthermore, the helium detector is connected to the helium detection chamber via a vacuum pipe and a vacuum valve, and the helium detection chamber is provided with a helium detection chamber top cover, a pressure relief pipe and a pressure relief valve.

[0014] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: The utility model is about the helium detection auxiliary device of the portable square shell lithium battery, and the main function is embodied in the helium filling auxiliary device, which is concentrated in the upper area of ​​the upper clamping claw structure. The helium filling auxiliary structure mainly includes an air intake pipe, a process nail hollow barrel, a piston and a piston shaft, a U-shaped exhaust pipe, etc. The air intake pipe is connected to the helium source. By visually observing the liquid level in the U-shaped exhaust pipe, the filling of helium along the hollow barrel and the injection hole can be inferred. At the same time, the upper clamping claw is pressed on the large surface of the battery cell. The upper clamping claw is released within a specified time to ensure that more helium can be inhaled from the injection port due to the pressure difference inside and outside the battery cell. At the same time, when the helium filling stage is over, the helium source can be turned off, and the process nail can be pressed into the injection port along the inner wall of the hollow barrel through the piston handle to complete the nail insertion process. After nail insertion, the battery cell is placed in the restraint tooling, and the two sides are fixed and pressed by screws; it is worth noting that the restraint tooling can be placed in the vacuum chamber in advance. At this time, close the upper cover of the vacuum chamber and operate the helium detector to perform vacuum leak detection. This design matches the helium filling and helium detection processes of square shell batteries of different sizes to the maximum extent, and also improves the accuracy of helium detection, avoiding misjudgment and missed judgment in the process, and ensuring the yield of the helium detection process to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the helium filling auxiliary device of the utility model;

[0016] Figure 2 It is a side view of the helium filling auxiliary device of the utility model;

[0017] Figure 3 This is the front view of the helium detection restraint tooling of the utility model;

[0018] Figure 4 It is a top view of the helium detection restraint tooling of the utility model;

[0019] Figure 5 It is a schematic diagram of a tooling helium detector device of the utility model.

[0020] The accompanying drawings are marked as follows: 1. Helium filling device base, 2. Positioning bolt, 3. Positioning splint, 4. Back bracket, 5. Square shell battery cell, 601. Upper clamping jaw 1, 602. Positioning bolt of upper clamping jaw 1, 603. Positioning bolt of upper clamping jaw 2, 7. Helium filling auxiliary device, 701. Silicone oil, 702. U-shaped exhaust pipe, 703. Piston and piston shaft, 704. Empty bobbin, 705. Empty bobbin loading opening valve, 706. Forming process nail, 707. Intake pipe 1. 708. PU joint of air pipe, 709. Leather case of empty tube, 8. 2. Inlet pipe, 9. Pressure reducing valve or air gun, 10. Helium cylinder, 11. Front positioning limit block, 12. T-shaped vertical sliding platform, 13. Restraint tooling base, 14. Screw bracket, 15. Restraint tooling screw, 16. Movable splint, 17. Fixed splint, 18. Vacuum pipe and vacuum valve, 19. Top cover of helium detection chamber, 20. Pressure relief pipe and pressure relief valve, 21. Helium detection chamber. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0022] As a design of the square shell lithium battery helium detection device of the utility model, in order to adapt to the heights of different lithium batteries, the bottom fixing block, the upper fixed clamping claw hand and the helium filling device described in the utility model are uniformly fixed on the back bracket, wherein the base of the bottom fixing block and the back bracket are an integrated structure, and the base plays a role in stabilizing the center of gravity during use. A screw is provided in the middle position of the back bracket and is connected to the upper clamping claw hand / helium filling mechanism. Preferably, the screw can also be replaced by a slider, which can improve the production conversion efficiency of battery cells of different design sizes, but the position fixing problem of the upper clamping claw hand needs to be additionally considered.

[0023] The bottom fixing block of this design allows the bottom of the battery cell to be completely placed in the base, and the battery cell is fixed by the large clamping plates on both sides and the small clamping plates on the sides. It is worth noting that the three clamping plates can be moved to match battery cells of different thicknesses and widths.

[0024] According to the lithium battery helium inspection production process, please refer to the following implementation method. Figure 1, square shell lithium battery needs to be prepared before helium filling: the loading of battery cells and the preparation of production consumables. Regarding the loading of battery cells, 601, 602, and 7 in the figure are a whole, which is the top auxiliary structure. The T-shaped vertical sliding platform 12 in Figure 2 is used to perform up and down movement. After adjusting to the appropriate height, the battery cell is placed in the tooling. By adjusting the positioning bolt 2 and the front positioning limit block 11, the bottom of the battery cell is fixed. It is worth noting that a small gap can be left between the clamp and the battery cell to facilitate the loading and unloading of the battery cell. Similarly, after the position of the top auxiliary mechanism is lowered to contact with the top cover of the battery cell by the screw 12, the upper clamping jaw positioning bolts 602 and 603 are adjusted to position the top of the battery cell, during which the position of the square shell battery cell 5 is ensured to be vertical and without tilt; it is worth noting that a spring can be connected inside the upper clamping jaw positioning bolt 602, and the upper clamping jaw 601 side can be pre-positioned by the spring before adjustment. When unloading, the operation is opposite to the above steps. The position of the top auxiliary mechanism is adjusted first, and then the battery cell is taken out of the tooling. Regarding the preparation of production consumables, the piston and piston shaft 703 in the figure are restored to the initial position and the top, the empty tube loading opening valve 705 is opened, and then the forming process nails are placed in the empty tube 704 as required. The current design drawing can place a maximum of 2 pcs of forming process nails. After the nailing is completed, the empty tube loading opening valve 705 is closed.

[0025] In this design, when using the helium filling auxiliary device, the following steps can be followed: adjust the upper clamping jaw-positioning bolt 602 in advance, apply slight pressure to the large surface of the battery cell, and make the large surface of the shell slightly concave. The purpose of this step is to reduce the space inside the battery cell; open the two valves on the U-shaped exhaust pipe 702, confirm that the silicone oil 701 in the U-shaped groove is in a normal state, connect the air intake pipe 8 through the air pipe PU connector 708, and connect the air intake pipe 8 to the helium gun or the helium cylinder pressure reducing valve 9; open the helium cylinder 10, the helium gun or Helium cylinder pressure reducing valve 9, observe the state of silicone oil 701 in U-shaped exhaust pipe 702; when the helium pressure inside the empty tube 704 is too high, it will force the silicone oil to flow to one side, accompanied by bubbling. At this time, the position of the upper clamping bolt 602 can be adjusted to release the pressure on the large surface of the battery cell, so that the shell can be restored to its original shape. At this time, helium will be sucked into the battery cell along with the shell recovery process; the formation process nail is pressed into the injection hole through the piston and piston shaft 703 to complete the nail insertion, and then the helium source is closed to complete the battery cell helium filling process. It is worth noting that the air tightness inside the empty tube 704 is very good. For example, the bottom of the piston and piston shaft 703 is a rubber plug, which can ensure good air tightness while ensuring lubrication of the tube wall. The empty tube leather cover 709 fits tightly with the injection hole. For easy visual inspection, the U-shaped exhaust pipe 702, the empty tube 704, and the intake pipe 707 can be made of acrylic material.

[0026] In the use example of the present invention, considering that the restraint tool 3 shown in the figure has a certain weight and is not convenient to transfer back and forth, the restraint tool can be placed in the helium inspection chamber 21 in advance. The battery cell 5 after the pin is inserted is placed between the movable clamping plate 16 and the fixed clamping plate 17 of the restraint tool, and then the battery cell 5 is fixed by screwing the restraint tool screw 15 to prevent the battery cell from swelling during the vacuum helium inspection; the restraint tool can detect up to 2pcs of battery cells at a time.

[0027] In the present invention, the helium detection operation is performed based on other helium detection devices. The battery cell 5 is fixed by the restraint tooling shown in FIG3 and placed in the helium detection chamber 21. Then the helium detection chamber top cover 19 presses the helium detection chamber 21 tightly. Before the detection, the pressure relief valve 20 is closed. Under normal circumstances, this valve is normally closed. Ensure that the vacuum valve 18 is in an open state. Under normal circumstances, the vacuum valve is in a normally open state. After the above steps are completed, the helium detector is turned on for detection. After the detection is completed, the helium detection chamber top cover 19 is removed, and then the battery cell 5 is taken out to complete the helium detection process.

Claims

1. A lithium battery auxiliary device, characterized in that: The invention comprises a helium filling mechanism and a helium inspection restraint tool; the helium filling mechanism comprises a back support (4), a bottom fixing block, an upper fixed clamping claw hand (6) and a helium filling device; a T-shaped vertical sliding platform (12) is installed on the back support (4); the upper part of the T-shaped vertical sliding platform (12) is connected to the helium filling device, and the lower part is connected to the upper fixed clamping claw hand (6); the bottom fixing block is used to fix the battery cell (5), and the upper fixed clamping claw hand (6) is used to grab and fix the battery cell (5) and fill the battery cell (5) with helium through the helium filling device; the helium filling device comprises a helium filling auxiliary device (7) and a helium cylinder (10), and the helium filling auxiliary device (7) and the helium cylinder (10) are connected through an air inlet pipe (8); the helium inspection restraint tool is used to fix the battery cell (5) after the battery cell (5) is filled with helium, and to perform vacuum leak inspection on the battery cell (5) through a helium detector.

2. A lithium battery auxiliary device according to claim 1, characterized in that: The helium filling auxiliary device (7) comprises silicone oil (701), a U-shaped exhaust pipe (702), a piston and a piston shaft (703), an empty tube (704), an empty tube loading opening valve (705), a chemical process nail (706), an air intake pipe (707), an air pipe PU joint (708) and an empty tube leather sleeve (709); the empty tube (704) is provided with a piston and a piston shaft (703), an empty tube loading opening valve (705), a chemical process nail (706) and an empty tube leather sleeve (709) in sequence from top to bottom; the empty tube (704) is connected to the U-shaped exhaust pipe (702) and the air intake pipe (707) respectively; the U-shaped exhaust pipe (702) is provided with silicone oil (701); the air intake pipe (707) is connected to the air intake pipe (8) via the air pipe PU joint (708).

3. A lithium battery auxiliary device according to claim 1, characterized in that: The upper fixed clamping jaw hand (6) comprises an upper clamping jaw 1 (601); the upper clamping jaw 1 (601) is installed on the T-shaped vertical sliding platform (12) through an upper clamping jaw 1 positioning bolt (602) and an upper clamping jaw 2 positioning bolt (603).

4. A lithium battery auxiliary device according to claim 1, characterized in that: The bottom fixing block comprises a helium filling device base (1), a front positioning limit block (11) is mounted on the helium filling device base (1) via positioning bolts (2), a positioning clamping plate (3) is mounted on the front positioning limit block (11), and the positioning clamping plate (3) is used to fix the battery cell (5).

5. A lithium battery auxiliary device according to claim 1, characterized in that: A pressure reducing valve or an air gun (9) is provided at the connection between the air inlet pipe (8) and the helium cylinder (10).

6. A lithium battery auxiliary device according to claim 1, characterized in that: The T-shaped vertical sliding platform (12) comprises a sliding mechanism and a platform, wherein the sliding mechanism is a screw rod or a sliding block.

7. A lithium battery auxiliary device according to claim 2, characterized in that: The air inlet pipe 1 (707) is made of acrylic material.

8. A lithium battery auxiliary device according to claim 3, characterized in that: A spring is connected inside a positioning bolt (602) of the upper clamping jaw.

9. A lithium battery auxiliary device according to claim 1, characterized in that: The helium inspection restraint tool comprises a restraint tool base (13), a fixed clamping plate (17) is provided on the restraint tool base (13), two movable clamping plates (16) and two screw brackets (14) are symmetrically provided on both sides of the fixed clamping plate (17), and restraint tool screws (15) are fixedly provided in the two screw brackets (14); the battery cell (5) is fixed by the movable clamping plate (16) and the fixed clamping plate (17).

10. A lithium battery auxiliary device according to claim 1, characterized in that: The helium detector is connected to a helium detection chamber (21) via a vacuum pipe and a vacuum valve (18); the helium detection chamber (21) is provided with a helium detection chamber top cover (19) and a pressure relief pipe and a pressure relief valve (20).

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