Novel liquid injection sealing structure cover plate

Abstract

The utility model discloses a novel liquid injection sealing structure cover plate. The novel liquid injection sealing structure cover plate comprises a pole, a sealing nail, lower plastic, a light aluminum sheet, upper plastic and a sealing ring, a liquid injection hole is formed in the pole, and the sealing nail is mounted in the liquid injection hole; a clamping groove and a supporting surface are arranged on the liquid injection hole; the sealing nail comprises a metal cover plate and a rubber plug. According to the novel liquid injection sealing structure cover plate, the pole, the sealing nail, the lower plastic, the smooth aluminum sheet, the upper plastic and the sealing ring are arranged, the liquid injection hole usually formed in the smooth aluminum sheet is formed in the pole, the contact area between the liquid injection hole and the sealing nail can be increased, sealing performance can be improved conveniently, welding is carried out on the thick pole, and the sealing performance is improved. And the condition of liquid leakage caused by weld penetration is not easy to occur.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery cover technology, and in particular to a novel liquid injection sealing structure cover. Background Technology

[0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. It differs from rechargeable lithium-ion batteries and lithium-ion polymer batteries. The lithium battery was invented by Thomas Edison. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use require very strict environmental controls. Therefore, lithium batteries were not widely used for a long time. However, with the development of microelectronics technology at the end of the 20th century, the increasing miniaturization of devices placed higher demands on power supplies. Lithium batteries subsequently entered a stage of large-scale practical application.

[0003] The liquid injection hole of the lithium battery cover is usually set on the aluminum sheet. After the liquid injection hole is sealed with a sealing nail, the sealing nail is welded with a laser welding machine. However, the aluminum sheet is relatively thin, which can easily lead to welding slag and weld holes, and thus easily cause leakage.

[0004] Therefore, it is necessary to provide a novel liquid injection sealing structure cover plate to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to overcome the defects of the prior art, this utility model provides a novel liquid injection sealing structure cover plate that can improve the sealing performance and is less prone to weld burn-through and leakage.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The novel liquid injection sealing structure cover plate includes: an electrode post, a sealing pin, a lower plastic sheet, a light aluminum sheet, an upper plastic sheet, and a sealing ring. The electrode post has an injection hole, and the sealing pin is installed in the injection hole to seal the injection hole. The injection hole is provided with a groove and a support surface. The sealing pin includes a metal cover plate and a rubber plug.

[0008] Preferably, the injection hole is provided with an inclined mating surface one, and the metal cover plate is provided with a mating surface two with the same inclination as the mating surface one.

[0009] Preferably, the metal cover plate has a welding surface.

[0010] Preferably, the welding surface is vertical or inclined.

[0011] Preferably, the metal cover plate is provided with an integrally formed connecting column.

[0012] Preferably, an anti-detachment plate is installed on the connecting column.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) This utility model sets up an electrode post, a sealing nail, a lower plastic, a light aluminum sheet, an upper plastic and a sealing ring, and sets the injection hole, which is usually set on the light aluminum sheet, on the electrode post. This can increase the contact area between the injection hole and the sealing nail, which is convenient to improve the sealing performance. Furthermore, welding is performed on a thicker electrode post, which makes it less likely to weld through and cause leakage.

[0015] (2) By setting mating surface one and mating surface two, this utility model can facilitate the installation of the metal cover plate and increase the contact area between the metal cover plate and the injection hole.

[0016] (3) By setting a welding surface on the metal cover plate, this utility model can improve the welding strength between the metal cover plate and the pole post, and is beneficial to subsequent grinding operations.

[0017] (4) By setting an integrally formed connecting post on the metal cover plate, this utility model can improve the connection strength between the metal cover plate and the rubber stopper, and make the rubber stopper less prone to bending when inserted into the injection hole.

[0018] (5) By installing an anti-detachment plate on the connecting column, this utility model can increase the axial contact area between the connecting column and the rubber plug, so that the rubber plug is less likely to shrink axially during the process of being inserted into the injection hole. Attached Figure Description

[0019] Figure 1 A schematic diagram of the novel liquid injection sealing structure cover plate provided by this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of an embodiment of the electrode post in the novel liquid injection sealing structure cover plate shown;

[0021] Figure 3 for Figure 1 A schematic diagram of an embodiment of the sealing pin in the novel liquid injection sealing structure cover plate shown;

[0022] Figure 4 for Figure 1 A schematic diagram of an embodiment of the sealing pin in the novel liquid injection sealing structure cover plate shown;

[0023] Figure 5 for Figure 1 A schematic diagram of an embodiment of the sealing pin in the novel liquid injection sealing structure cover plate shown;

[0024] Figure 6 for Figure 1 A schematic diagram of an embodiment of the electrode post and sealing pin in the novel liquid injection sealing structure cover plate shown;

[0025] Figure 7 for Figure 1 A schematic diagram of an embodiment of the electrode post and sealing nail in the cover plate of the novel liquid injection sealing structure shown.

[0026] The corresponding names of the attached figures are: 1-Pole post, 2-Sealing nail, 3-Lower plastic, 4-Bright aluminum sheet, 5-Upper plastic, 6-Sealing ring, 11-Injection hole, 12-Slot, 13-Support surface, 14-Mating surface one, 21-Metal cover plate, 22-Plug, 23-Mating surface two, 24-Welding surface, 25-Connecting post, 26-Anti-detachment plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0028] Example 1:

[0029] like Figure 1-7 As shown, this utility model provides a novel liquid injection sealing structure cover plate, comprising: a pole post 1, a sealing nail 2, a lower plastic sheet 3, a light aluminum sheet 4, an upper plastic sheet 5, and a sealing ring 6. The connection design between the pole post 1, the lower plastic sheet 3, the light aluminum sheet 4, the upper plastic sheet 5, and the sealing ring 6 adopts a conventional design structure, which will not be elaborated here. In this embodiment, a liquid injection hole 11 is opened on the pole post 1, and the sealing nail 2 is installed inside the liquid injection hole 11 to seal it. It should be noted that the thickness of the pole post 1 is much greater than that of the light aluminum sheet 4. Therefore, compared to the conventional design of placing the liquid injection hole 11 on the light aluminum sheet 4, this application places the liquid injection hole 11 on the pole post 1, increasing the depth of the liquid injection hole 11 and increasing the contact area between the liquid injection hole 11 and the sealing nail 2, thus improving the sealing performance. Simultaneously, welding on the thicker pole post 1 reduces the risk of weld burn-through and leakage. It is worth noting that the sealing nail 2 and the liquid injection hole 11 are interference fits, and the shape can be lantern-shaped. Figure 1-5 As shown), cylindrical cone ( Figure 6 (as shown), or other shapes that meet sealing performance requirements (such as...) Figure 7As shown in the figure, in this embodiment, a lantern shape is used as an example. The injection hole 11 is provided with a slot 12 and a support surface 13. The sealing nail 2 includes a metal cover plate 21 and a rubber plug 22 installed at the bottom of the metal cover plate 21. In use, the terminal post 1, the lower plastic 3, the light aluminum sheet 4, the upper plastic 5 and the sealing ring 6 are assembled on the battery. Then, the battery is injected with liquid through the injection hole 11. After the liquid injection is completed, the sealing nail 2 is inserted into the injection hole 11, so that the rubber plug 22 is stuck in the slot 12 and squeezes the inner wall of the slot to seal the injection hole 11. At the same time, the metal cover plate 21 is attached to the support surface 13. The joint between the metal cover plate 21 and the injection hole 11 is sealed and welded using welding equipment to complete the installation of the battery cover plate. This application moves the injection hole 11, which was originally located on the aluminum sheet 4, to the pole post 1, thereby increasing the depth of the injection hole 11. This increases the contact area between the injection hole 11 and the sealing nail 2, which helps to improve the sealing performance. At the same time, welding is performed on the thicker pole post 1, which makes it less likely to cause burn-through and leakage.

[0030] By setting up the pole post 1, sealing nail 2, lower plastic 3, light aluminum sheet 4, upper plastic 5 and sealing ring 6, and setting the injection hole 11, which is usually set on the light aluminum sheet 4, on the pole post 1, the contact area between the injection hole 11 and the sealing nail 2 can be increased, which facilitates the improvement of sealing performance. Furthermore, welding is performed on the thicker pole post 1, which makes it less likely to cause burn-through and leakage.

[0031] Example 2:

[0032] like Figure 2-3 As shown, an inclined mating surface 14 is provided inside the injection hole 11, and a mating surface 23 with the same slope as the mating surface 14 is provided on the metal cover plate 21. During use, when the metal cover plate 21 is inserted into the injection hole 11, the inclined mating surface 14 and the mating surface 23 prevent the metal cover plate 21 from getting stuck on the top edge of the injection hole 11, and increase the contact area between the metal cover plate 21 and the injection hole 11.

[0033] By setting mating surface 14 and mating surface 23, the installation of metal cover plate 21 can be facilitated, and the contact area between metal cover plate 21 and injection hole 11 can be increased.

[0034] Example 3:

[0035] like Figure 3-4 As shown, a welding surface 24 is provided on the metal cover plate 21. The welding surface 24 is vertical or inclined inward, so that after the mating surface 14 and the mating surface 23 are attached, the metal cover plate 21 forms a welding groove with the welding surface 24 and the mating surface 14. During welding, welding is carried out along the welding groove, which increases the welding depth and improves the welding strength. At the same time, it causes the weld point to not be too high above the top plane, thus reducing the workload of grinding the weld point and facilitating subsequent grinding operations.

[0036] By providing a welding surface 24 on the metal cover plate 21, the welding strength between the metal cover plate 21 and the pole post 1 can be improved, which is beneficial to subsequent grinding operations.

[0037] Example 4:

[0038] like Figure 5 As shown, the metal cover plate 21 is provided with an integrally formed connecting post 25. The connecting post 25 is inserted into the rubber stopper 22, which improves the connection strength between the metal cover plate 21 and the rubber stopper 22, and makes it less likely for the rubber stopper 22 to be bent when it is inserted into the injection hole 11.

[0039] By providing an integrally formed connecting post 25 on the metal cover plate 21, the connection strength between the metal cover plate 21 and the rubber stopper 22 can be improved, and the rubber stopper 22 is less likely to bend when it is inserted into the injection hole 11.

[0040] Example 5:

[0041] like Figure 5 As shown, an anti-detachment plate 26 is installed on the connecting post 25. The anti-detachment plate 26 increases the axial contact area between the connecting post 25 and the rubber plug 22, making it less likely for the rubber plug 22 to shrink axially during the process of being inserted into the injection hole 11, so that the rubber plug 22 can be smoothly locked in the slot 12.

[0042] By installing an anti-detachment plate 26 on the connecting post 25, the axial contact surface between the connecting post 25 and the rubber stopper 22 can be increased, making it less likely for the rubber stopper 22 to shrink axially during the process of being inserted into the injection hole 11.

[0043] Working principle: In use, the terminal post 1, lower plastic 3, aluminum sheet 4, upper plastic 5, and sealing ring 6 are assembled onto the battery. Then, electrolyte is injected into the battery through the injection hole 11. After injection, the sealing pin 2 is inserted into the injection hole 11, causing the rubber stopper 22 to engage with the groove 12 and press against the inner wall of the groove, thus sealing the injection hole 11. Simultaneously, the bottom of the metal cover plate 21 adheres to the support surface 13, and welding equipment is used to seal the joint between the metal cover plate 21 and the injection hole 11, completing the installation of the battery cover. This application moves the injection hole 11, originally located on the aluminum sheet 4, to the terminal post 1, increasing the depth of the injection hole 11 and increasing the contact area between the injection hole 11 and the sealing pin 2, thus improving sealing performance. Furthermore, welding on the thicker terminal post 1 reduces the risk of weld holes, burn-through, and leakage.

Claims

1. A novel liquid injection sealing structure cover plate, characterized in that, include: The pole (1), sealing pin (2), lower plastic (3), light aluminum sheet (4), upper plastic (5) and sealing ring (6); An injection hole (11) is provided on the electrode post (1), and the sealing nail (2) is installed in the injection hole (11); The injection hole (11) is provided with a slot (12) and a support surface (13); The sealing pin (2) includes a metal cover plate (21) and a rubber plug (22).

2. The novel liquid injection sealing structure cover plate according to claim 1, characterized in that, An inclined mating surface one (14) is provided inside the injection hole (11), and a mating surface two (23) is provided on the metal cover plate (21).

3. The novel liquid injection sealing structure cover plate according to claim 1, characterized in that, The metal cover plate (21) is provided with a welding surface (24).

4. The novel liquid injection sealing structure cover plate according to claim 3, characterized in that, The welding surface (24) is vertical or inclined.

5. The novel liquid injection sealing structure cover plate according to claim 1, characterized in that, The metal cover plate (21) is provided with an integrally formed connecting column (25).

6. A novel liquid injection sealing structure cover plate according to claim 5, characterized in that, An anti-detachment plate (26) is installed on the connecting column (25).

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