Negative pressure sealing device

Abstract

The utility model discloses a negative pressure sealing device which is used for negative pressure sealing of a battery, the battery is provided with a liquid injection hole, the device comprises a cavity, an end cover, a first interface and a second interface, one end of the cavity is provided with an opening for the battery to pass through, the cavity is used for placing the battery, and the liquid injection hole of the battery faces the opening; the end cover is connected to the opening in a covering manner; the first interface is arranged on the cavity and is used for vacuumizing the cavity; and the second interface is arranged on the cavity and is used for returning helium to the cavity. The sealing effect is achieved through the cavity and the end cover to replace a rubber plug, vacuumizing and helium return operation of the battery can be achieved in the cavity, the rubber plug does not need to be pressed into the battery when the battery is sealed under negative pressure, and the problem that a helium detection procedure fails is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a negative pressure sealing device. Background Technology

[0002] When sealing the existing battery under negative pressure, firstly, negative pressure is drawn from the battery through the injection hole and helium is returned. Then, a rubber stopper is pressed into the injection hole for temporary sealing. Finally, a sealing aluminum sheet is laser-welded to the upper end of the injection hole for sealing. Then, helium testing is performed on the laser-welded position to determine whether the injection hole is leaking.

[0003] However, after the rubber stopper is pressed in, some of the stopper will prevent helium leakage. Even if there is a leak in the sealing aluminum sheet welding, it cannot be detected by helium testing, causing the helium testing process to fail. During subsequent use, some batteries will leak liquid at the filling hole, resulting in insulation failure of the entire battery system. Utility Model Content

[0004] The purpose of this invention is to provide a negative pressure sealing device, which aims to solve the problem in the prior art where the helium detection process fails because a rubber stopper needs to be pressed in during negative pressure sealing of the battery.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A negative pressure sealing device is provided for sealing a battery under negative pressure. The battery has an injection hole and includes: a cavity, an end cap, a first interface, and a second interface. One end of the cavity has an opening for the battery to pass through. The cavity is used to place the battery, and the injection hole of the battery faces the opening. The end cap is closed and connected to the opening. The first interface is provided on the cavity for evacuating the cavity. The second interface is provided on the cavity for returning helium gas to the cavity.

[0006] Furthermore, the end cap is provided with a through hole corresponding to the injection hole, and also includes: a sealing ring, a transparent element, and a fixing block. The sealing ring is fitted and connected inside the through hole; the transparent element is disposed inside the through hole and abuts against the sealing ring; the fixing block is annular and disposed inside the through hole, and the fixing block is detachably abuts against the transparent element.

[0007] Furthermore, the through hole is provided with a stepped portion, and the sealing ring abuts against the stepped portion.

[0008] Furthermore, the transparent component is transparent tempered glass.

[0009] Furthermore, the fixing block is made of transparent tempered glass.

[0010] Furthermore, the end cap is a transparent end cap.

[0011] Furthermore, the end cap is made of transparent tempered glass.

[0012] Furthermore, when the battery is placed in the cavity, a preset distance is left between the injection hole and the end cap.

[0013] Furthermore, a sealing strip is provided at the opening, and the end cap abuts against the sealing strip.

[0014] Furthermore, the first interface and the second interface are sequentially disposed on one side of the cavity, and the distance between the second interface and the opening is less than the distance between the first interface and the opening.

[0015] This utility model provides a negative pressure sealing device for sealing batteries. The battery has an injection hole and includes a cavity, an end cap, a first interface, and a second interface. One end of the cavity has an opening for the battery to pass through. The cavity is used to place the battery, and the injection hole of the battery faces the opening. The end cap is connected to the opening. The first interface is located on the cavity for evacuating the cavity. The second interface is located on the cavity for returning helium gas to the cavity. This utility model achieves a sealing effect through the cavity and end cap, replacing the rubber stopper. Moreover, it can perform evacuation and helium return operations within the cavity. When the battery is placed in the cavity, because of the injection hole, when evacuating the cavity through the first interface, the battery's interior is simultaneously evacuated through the injection hole. Similarly, when returning helium gas to the cavity through the second interface, the battery's interior is simultaneously returned through the injection hole. This eliminates the need for a rubber stopper during negative pressure sealing, avoiding the problem of helium testing failure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the negative pressure sealing device provided in this embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the end cap structure provided in an embodiment of this utility model;

[0019] Figure 3 A schematic diagram of the battery structure provided in an embodiment of this utility model.

[0020] Explanation of the markings in the image:

[0021] 1. Battery; 11. Fluid filling port;

[0022] 2. Cavity; 21. Opening; 22. Sealing strip;

[0023] 3. End cap; 31. Through hole; 32. Sealing ring; 33. Transparent part; 34. Fixing block; 35. Stepped part;

[0024] 4. First interface;

[0025] 5. Second interface;

[0026] 6. Sealing aluminum sheet. Detailed Implementation

[0027] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] Combination Figure 1-3 As shown, this utility model provides a negative pressure sealing device for sealing a battery 1 under negative pressure. The battery 1 is provided with an injection hole 11, including: a cavity 2, an end cap 3, a first interface 4, and a second interface 5. One end of the cavity 2 is provided with an opening 21 for the battery 1 to pass through. The cavity 2 is used to place the battery 1, and the injection hole 11 of the battery 1 faces the opening 21. The end cap 3 is closed and connected to the opening 21. The first interface 4 is provided on the cavity 2 for evacuating the cavity 2. The second interface 5 is provided on the cavity 2 for returning helium gas to the cavity 2.

[0032] In this embodiment of the invention, the sealing effect is achieved by the cavity 2 and the end cap 3, replacing the rubber stopper. Moreover, the vacuuming and helium return operations of the battery 1 can be performed within the cavity 2. When the battery 1 is placed in the cavity 2, since the battery 1 is provided with a liquid injection hole 11, when the cavity 2 is evacuated through the first interface 4, the battery 1 is evacuated synchronously through the liquid injection hole 11. Similarly, when the cavity 2 is returned to helium through the second interface 5, the battery 1 is returned to helium synchronously through the liquid injection hole 11. This eliminates the need to press a rubber stopper into the battery 1 during negative pressure sealing, avoiding the problem of helium detection process failure.

[0033] In some embodiments, the end cap 3 is provided with a through hole 31 corresponding to the injection hole 11, and further includes: a sealing ring 32, a transparent element 33 and a fixing block 34. The sealing ring 32 is fitted and connected inside the through hole 31; the transparent element 33 is disposed inside the through hole 31 and abuts against the sealing ring 32; the fixing block 34 is annular and disposed inside the through hole 31, and the fixing block 34 is detachably abutted against the transparent element 33.

[0034] In this embodiment, the end cap 3 is provided with a through hole 31 corresponding to the liquid injection hole 11, and a transparent transparent element 33 is provided in the through hole 31, so that the negative pressure sealing device can weld and seal the liquid injection hole 11 by laser welding machine without removing the end cap 3. The sealing ring 32 is used to improve the sealing between the through hole 31 and the transparent element 33, and prevent the vacuuming and helium return operations of the battery 1 from being affected. The fixing block 34 is annular and abuts against the transparent element 33, which can stabilize the transparent element 33 in the through hole 31, and will not interfere with the laser welding machine welding the sealing aluminum sheet 6 to the liquid injection hole 11 of the battery 1.

[0035] In some embodiments, a stepped portion 35 is provided on the through hole 31, and the sealing ring 32 abuts against the stepped portion 35.

[0036] In this embodiment, the stepped portion 35 can provide an abutment position for the sealing ring 32 to prevent the sealing ring 32 from slipping off, thereby stabilizing the transparent part 33 and enhancing the overall sealing performance of the end cover 3, and avoiding adverse effects on the vacuuming and helium return operations of the battery 1 due to air leakage from the end cover 3.

[0037] In some embodiments, the transparent element 33 is transparent tempered glass.

[0038] In this embodiment, the transparent tempered glass has high strength, which can prevent the battery 1 from being damaged by vacuuming and helium return operations. It can also further improve the sealing performance of the end cap 3, and the injection hole 11 can be welded and sealed through the transparent tempered glass by a laser welding machine without removing the end cap 3.

[0039] In some embodiments, the fixing block 34 is transparent tempered glass.

[0040] In this embodiment, the fixing block 34 is made of transparent tempered glass, which can not only secure the transparent part 33 in the through hole 31, but also will not interfere with the laser welding machine welding the sealing aluminum sheet 6 to the liquid injection hole 11 of the battery 1.

[0041] In some embodiments, the end cap 3 is a transparent end cap 3.

[0042] In this embodiment, the transparent end cap 3 allows the negative pressure sealing device to weld and seal the injection hole 11 using a laser welding machine without removing the end cap 3.

[0043] In some embodiments, the end cap 3 is made of transparent tempered glass.

[0044] In this embodiment, the transparent tempered glass has high strength, which can prevent the battery 1 from being damaged by vacuuming and helium return operations. It can also further improve the sealing performance of the end cap 3, and the injection hole 11 can be welded and sealed through the transparent tempered glass by a laser welding machine without removing the end cap 3.

[0045] In some embodiments, when the battery 1 is placed in the cavity 2, a preset distance is left between the liquid injection hole 11 and the end cap 3.

[0046] In this embodiment, a preset distance is left between the injection hole 11 and the end cap 3, meaning the length of the cavity 2 is greater than the length of the battery 1. This space between the injection hole 11 and the end cap 3 facilitates welding and sealing of the injection hole 11 through the transparent tempered glass using a laser welding machine without removing the end cap 3. The preset distance is set according to the position of the laser welding machine in the actual application scenario.

[0047] In some embodiments, a sealing strip 22 is provided at the opening 21, and the end cap 3 abuts against the sealing strip 22.

[0048] In this embodiment, the end cap 3 abutting against the sealing strip 22 can improve the sealing performance at the connection between the end cap 3 and the cavity 2, avoid the adverse effects of air leakage from the end cap 3 on the vacuuming and helium return operations of the battery 1, and improve the overall stability of the negative pressure sealing device.

[0049] In some embodiments, the first interface 4 and the second interface 5 are sequentially disposed on one side of the cavity 2, and the distance between the second interface 5 and the opening 21 is less than the distance between the first interface 4 and the opening 21.

[0050] In this embodiment, the first interface 4 and the second interface 5 are located on one side of the cavity 2, which can save the overall space occupied by the negative pressure sealing device. The distance between the second interface 5 and the opening 21 is less than the distance between the first interface 4 and the opening 21. That is, the first interface 4 is far away from the injection hole 11. When vacuuming, the gas in the cavity is discharged through the first interface 4, and the gas in the battery 1 is discharged through the injection hole 11 through the first interface 4 due to the pressure difference, which helps to vacuum. The second interface 5 is close to the injection hole 11, which helps to preferentially return helium to the battery 1 when returning helium, thus improving the efficiency of vacuuming and helium return.

[0051] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A negative pressure sealing device for a negative pressure sealing of a battery, the battery being provided with a liquid injection hole, characterized in that, include: A cavity, one end of which is provided with an opening for the battery to pass through, the cavity being used to hold the battery, and the battery's electrolyte filling hole facing the opening; An end cap, which closes and connects to the opening; A first interface is disposed on the cavity and is used to evacuate the cavity; The second interface, which is located on the cavity, is used to return helium gas to the cavity.

2. The negative pressure sealing device of claim 1, wherein, The end cap is provided with a through hole corresponding to the injection hole, and further includes: A sealing ring is fitted and connected inside the through hole; A transparent element is disposed within the through hole and abuts against the sealing ring; A fixing block, which is annular and disposed within the through hole, and is detachably abutted against the transparent component.

3. The negative pressure sealing device of claim 2, wherein, The through hole has a stepped portion, and the sealing ring abuts against the stepped portion.

4. The negative pressure sealing device of claim 2, wherein, The transparent component is made of transparent tempered glass.

5. The negative pressure sealing device of claim 2, wherein, The fixing block is made of transparent tempered glass.

6. The negative pressure sealing device of claim 1, wherein, The end cap is a transparent end cap.

7. The negative pressure sealing device of claim 5, wherein, The end cap is made of transparent tempered glass.

8. The negative pressure port device of any of claims 2-7, wherein, When the battery is placed in the cavity, a preset distance is left between the injection hole and the end cap.

9. The negative pressure sealing device of claim 1, wherein, A sealing strip is provided at the opening, and the end cap abuts against the sealing strip.

10. The negative pressure sealing device of claim 1, wherein, The first interface and the second interface are sequentially disposed on one side of the cavity, and the distance between the second interface and the opening is less than the distance between the first interface and the opening.

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