Sealing structure for liquid injection hole of secondary battery

Abstract

The utility model provides a secondary battery liquid injection hole sealing structure which comprises a top cover piece, a top cover piece, a top cover piece, a top cover piece and a bottom cover piece, a rectangular groove is formed in an inner cavity of the top cover piece, a counterbore and a first through hole are formed in the upper end and the lower end of the rectangular groove respectively, and the rectangular groove is communicated with the counterbore and the first through hole respectively; the sealing nail is detachably inserted into the counterbore; the sliding block is mounted in the rectangular groove, and a through hole II is formed in the surface of the sliding block; the spring is installed in the rectangular groove, the spring is located on one side of the sliding block, and when the spring is in a free state, the second through hole is staggered with the counterbore and the first through hole; the sealing gaskets are adhered to the upper surface and the lower surface of the sliding block; according to the utility model, a detachable sealing structure is adopted, so that the installation is convenient, the sealing performance is good, and the battery leakage can be prevented while secondary liquid supplementing is carried out on the battery.

Description

Technical Field

[0001] The utility model relates to the field of lithium-ion batteries, in particular to a sealing structure for a liquid injection hole of a secondary battery. Background Art

[0002] With the vigorous development of the new energy industry, electric vehicles have gradually come into people's view and the demand has increased rapidly. Among them, power batteries, as the core power source of electric vehicles, play a vital role.

[0003] In traditional power battery structures, an injection hole for adding electrolyte is opened on the top cover. After the lithium-ion battery is injected for the second time, the injection hole needs to be sealed in order to ensure a negative pressure environment inside the shell to prevent external gas and moisture from entering the battery cell.

[0004] Repeated charge and discharge processes of the battery will lead to electrolyte loss, resulting in a decline in battery performance. The electrolyte in the battery needs to be replenished to ensure that the battery continues to work normally.

[0005] In most existing processes, after the electrolyte is injected, a sealing glue nail is used to seal the injection hole, and then a sealing aluminum nail and a top cover plate are used for welding, so that the seal cannot be disassembled and the electrolyte cannot be replenished, resulting in a low battery reuse rate.

[0006] To this end, we propose a secondary battery filling hole sealing structure to solve the problem that the electrolyte cannot be replenished after the filling hole is welded and sealed. Utility Model Content

[0007] The purpose of this utility model is to solve the shortcomings of the prior art. In order to achieve the above purpose, this utility model adopts the following technical solutions:

[0008] A secondary battery filling hole sealing structure includes: a top cover plate, wherein the inner cavity of the top cover plate is provided with a rectangular groove, and the upper and lower ends of the rectangular groove are respectively provided with a countersunk hole and a through hole one, and the rectangular groove is respectively connected to the countersunk hole and the through hole one; a sealing nail, which is detachably inserted into the countersunk hole; a slider, which is installed in the rectangular groove, and the surface of the slider is provided with a through hole two passing through; a spring, which is installed in the rectangular groove, and the spring is located on one side of the slider, and when the spring is in a free state, the through hole two is respectively misaligned with the countersunk hole and the through hole one; and a sealing gasket, which is adhered to the upper and lower surfaces of the slider.

[0009] Further preferably, the length and width of the slider are both larger than the maximum value of the diameters of the countersunk hole and the through hole.

[0010] Further preferably, the diameter of the through hole 1 is larger than the diameter of the through hole 2.

[0011] Further preferably, the inner side wall of the countersunk hole is provided with an internal thread.

[0012] Further preferably, the sealing nail consists of a nail head and a nail column, an outer side wall of the nail column is provided with an external thread, and an upper surface of the nail head is provided with a groove.

[0013] Further preferably, a blind hole is provided on the upper surface of the slider.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model is provided with a rectangular groove, a countersunk hole and a through hole 1 on the top cover sheet, and a sealing nail is detachably connected to the countersunk hole through a thread, and a primary sealing of the countersunk hole is achieved by the sealing nail, and a slider is slidably engaged in the rectangular groove. When the spring is in a free state, the through hole 2 is respectively misaligned with the countersunk hole and the through hole 1; at this time, a secondary sealing of the countersunk hole and the through hole 1 is achieved by the sealing gaskets on the upper and lower surfaces of the slider, and the sealing effect is ensured by the double sealing. The utility model adopts a detachable sealing structure, which is easy to install and has good sealing performance. It can prevent battery leakage while replenishing the battery for the second time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial cross-sectional view of the utility model;

[0017] Figure 2 It is a partial cross-sectional view of the top cover sheet in the utility model;

[0018] Figure 3 This is a cross-sectional view of the sealing nail in the present invention;

[0019] Figure 4 It is a structural schematic diagram of the slider in the utility model.

[0020] In the figure: top cover piece 1, sealing nail 2, spring 3, slider 4, sealing gasket 5, rectangular groove 11, countersunk hole 12, through hole 13, groove 21, nail head 22, nail column 23, through hole 2 41, blind hole 42. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figures 1-4A secondary battery filling hole sealing structure comprises: a top cover sheet 1, wherein the inner cavity of the top cover sheet 1 is provided with a rectangular groove 11, and the upper and lower ends of the rectangular groove 11 are respectively provided with a countersunk hole 12 and a through hole 13, and the rectangular groove 11 is connected with the countersunk hole 12 and the through hole 13; a sealing nail 2, which is detachably inserted into the countersunk hole 12; a slider 4, which is installed in the rectangular groove 11, and a through hole 2 41 is provided on the surface of the slider 4; a spring 3, which is installed in the rectangular groove 11, and the spring 3 is located on one side of the slider 4. When the spring 3 is in a free state, the through hole 2 41 is misaligned with the countersunk hole 12 and the through hole 13 respectively; a sealing gasket 5, which is adhered to the upper and lower surfaces of the slider 4.

[0023] In the embodiment: a rectangular groove 11, a countersunk hole 12 and a through hole 13 are provided on the top cover sheet 1, and a sealing nail 2 is detachably connected to the countersunk hole 12 through a thread, and a primary sealing of the countersunk hole 12 is achieved by the sealing nail 2, and the slider 4 is slidably engaged in the rectangular groove 11. When the spring 3 is in a free state, the through hole 2 41 is respectively misaligned with the countersunk hole 12 and the through hole 1 13; at this time, the sealing gasket 5 on the upper and lower surfaces of the slider 4 achieves a secondary sealing of the countersunk hole 12 and the through hole 1 13. Through the two sealings, the sealing effect is ensured to prevent battery leakage.

[0024] In one embodiment, the countersunk hole 12 and the through hole 13 can be concentrically arranged or eccentrically arranged, which is not limited here.

[0025] In the embodiment: when the battery needs to be replenished, the sealing nail 2 is removed from the countersunk hole 12, and the slider 4 is manually moved toward the side of the spring 3 to compress the spring 3 until the second through hole 41 is connected with the countersunk hole 12 and the first through hole 13 respectively. At this time, the external injection device ejector mechanism is inserted into the countersunk hole 12, the second through hole 41 and the first through hole 13 in sequence, so that the inner and outer channels are opened and the electrolyte can flow in; the utility model adopts a detachable sealing structure, which is easy to install and has good sealing performance. It can replenish the battery for the second time while preventing the battery from leaking.

[0026] The length and width of the slider 4 are both larger than the maximum diameters of the countersunk hole 12 and the through hole 13 .

[0027] In the embodiment: the slider 4 is clamped in the rectangular groove 11, and it cannot be removed from the upper and lower sides of the rectangular groove 11. In the embodiment, the top cover sheet 1 can be a modular structure, and the lower part of the rectangular groove 11 (that is, the part where the through hole 13 is located) is fixed to the upper part by welding or bolts. This structure facilitates the installation of the slider 4 and the spring 3, but the top cover sheet 1 is not limited to the above two structures. For example, the slider 4 and the spring 3 are first installed in the rectangular groove 11, and then the lower part of the rectangular groove 11 (that is, the part where the through hole 13 is located) is fixed to the upper part by welding or bolts to achieve the installation of this application.

[0028] The diameter of the first through hole 13 is greater than the diameter of the second through hole 41 .

[0029] In the embodiment, the diameter of the through hole 13 is larger than the diameter of the through hole 41 . When the through hole 13 is connected to the through hole 41 , the ejector pin of the injection device is easy to insert, which facilitates fluid replenishment.

[0030] The inner wall of the countersunk hole 12 is provided with an internal thread; the sealing nail 2 is composed of a nail head 22 and a nail column 23, the outer wall of the nail column 23 is provided with an external thread, and the upper surface of the nail head 22 is provided with a groove 21.

[0031] In the embodiment: the sealing nail 2 of the T-shaped structure can fit the sealing ring onto the sealing nail 2 through the nail head 22 and press it into the countersunk hole 12 to enhance the sealing effect. The groove 21 on the nail head 22 allows the hexagonal wrench to easily rotate the sealing nail 2 through the groove 21, which is beneficial to the installation of the sealing nail 2 and the countersunk hole 12.

[0032] A blind hole 42 is formed on the upper surface of the slider 4 .

[0033] In the embodiment, a blind hole 42 is provided on the upper surface of the slider 4, and the blind hole 42 facilitates the movement of the slider 4 toward the spring 3.

[0034] The utility model is provided with a rectangular groove 11, a countersunk hole 12 and a through hole 13 on the top cover sheet, and the sealing nail 2 is detachably connected to the countersunk hole 12 through a thread, and the countersunk hole 12 is sealed once by the sealing nail 2, and the slider 4 is slidably engaged in the rectangular groove 11. When the spring 3 is in a free state, the through hole 2 41 is respectively misaligned with the countersunk hole 12 and the through hole 13; at this time, the sealing gasket 5 on the upper and lower surfaces of the slider 4 is used to achieve a secondary sealing of the countersunk hole 12 and the through hole 13. The sealing effect is ensured by the double sealing. The utility model adopts a detachable sealing structure, which is easy to install and has good sealing performance. It can prevent battery leakage while replenishing the battery for the second time.

Claims

1. A secondary battery filling hole sealing structure, characterized in that: include: A top cover plate, wherein a rectangular groove is formed in the inner cavity of the top cover plate, a countersunk hole and a through hole are formed at the upper and lower ends of the rectangular groove, and the rectangular groove is connected to the countersunk hole and the through hole respectively; A sealing nail, detachably inserted into the countersunk hole; A slider is installed in the rectangular groove, and a second through hole is opened on the surface of the slider; A spring is installed in the rectangular groove, the spring is located on one side of the slider, and when the spring is in a free state, the second through hole is offset from the countersunk hole and the first through hole respectively; A sealing gasket is adhered to the upper and lower surfaces of the slider.

2. The secondary battery liquid injection hole sealing structure according to claim 1, characterized in that: The length and width of the slider are both larger than the maximum value of the diameter of the countersunk hole and the through hole.

3. The secondary battery liquid injection hole sealing structure according to claim 1, characterized in that: The diameter of the first through hole is greater than the diameter of the second through hole.

4. The sealing structure for the liquid injection hole of a secondary battery according to claim 1, wherein: An inner side wall of the countersunk hole is provided with an internal thread.

5. The secondary battery liquid injection hole sealing structure according to claim 1, characterized in that: The sealing nail consists of a nail head and a nail column. The outer side wall of the nail column is provided with an external thread, and the upper surface of the nail head is provided with a groove.

6. The secondary battery liquid injection hole sealing structure according to claim 1, characterized in that: A blind hole is provided on the upper surface of the sliding block.

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