Liquid injection hole sealing structure and battery

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a liquid injection hole sealing structure and a battery, and the liquid injection hole sealing structure comprises a battery cover plate which is provided with a liquid injection hole; the elastic sealing element comprises a first part and a second part which are connected with each other, the first part extends into the liquid injection hole, and the second part covers the opening of the liquid injection hole and is propped against the surface of the battery cover plate; the fixing part is located on the side, away from the first part, of the second part, the fixing part is connected with the battery cover plate, and the fixing part abuts against the second part. According to the liquid injection hole sealing structure and the battery provided by the invention, the problem of liquid leakage at the liquid injection hole can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a liquid injection hole sealing structure and a battery. Background Art

[0002] During the battery processing process, it is necessary to first pass the electrolyte through the injection hole on the battery cover and then seal the injection hole to prevent the electrolyte from leaking from the injection hole, which would affect the normal use of the battery and even cause a safety accident.

[0003] The traditional injection hole sealing structure generally uses laser welding aluminum nails for sealing, and there is a leakage problem at the injection hole. There are two main reasons: one is that during the battery processing, electrolyte crystallization occurs around the injection hole, and there is still residue after laser cleaning, so electrolyte crystallization after laser welding will cause cracks or holes in the aluminum nail weld; the other is that the laser optical lens is aged or contaminated, which affects the shape of the laser spot and causes cracks in the aluminum nail weld. Therefore, the traditional battery cover injection hole sealing structure needs to be improved. Utility Model Content

[0004] The present application provides a liquid injection hole sealing structure and a battery, which can improve the liquid leakage problem existing at the liquid injection hole.

[0005] In a first aspect, an embodiment of the present application provides a liquid injection hole sealing structure, comprising:

[0006] A battery cover plate, wherein the battery cover plate is provided with a liquid injection hole;

[0007] An elastic sealing member, the elastic sealing member comprising a first portion and a second portion connected to each other, the first portion extending into the injection hole, the second portion covering the opening of the injection hole, and the second portion abutting against a surface of the battery cover plate;

[0008] A fixing member, wherein the fixing member is located at a side of the second part away from the first part, the fixing member is connected to the battery cover, and the fixing member abuts against the second part.

[0009] In some embodiments, the first portion is interference fit with the injection hole.

[0010] In some embodiments, one end of the first portion away from the second portion extends to the outside of the liquid injection hole.

[0011] In some embodiments, the first part located inside the injection hole is a compression part, and the volume of the compression part is D1. After the compression part is removed from the injection hole, the volume of the compression part expands to D, (D-D1) / D=k, k is 10%-40%.

[0012] In some embodiments, a limiting groove is provided at one end of the fixing member facing the second portion, an end of the second portion facing away from the first portion is located in the limiting groove, and a bottom surface of the limiting groove abuts against the second portion.

[0013] In some embodiments, the side wall of the limiting groove includes a limiting inclined surface, and the limiting inclined surface extends from the bottom of the limiting groove to the top of the limiting groove in a direction away from the center of the limiting groove.

[0014] In some embodiments, the battery cover is provided with a receiving groove, the orifice of the injection hole is formed on the bottom surface of the receiving groove, and the fixing member is located in the receiving groove.

[0015] In some embodiments, the side wall of the receiving groove includes a positioning bevel, and from the bottom of the receiving groove to the top of the receiving groove, the positioning bevel extends away from the center of the receiving groove, and the side surface of the fixing member is arranged to fit the positioning bevel.

[0016] In some embodiments, the elastic sealing element is made of fluororubber.

[0017] In a second aspect, an embodiment of the present application provides a battery, comprising the liquid injection hole sealing structure as described in the first aspect.

[0018] The injection hole sealing structure provided by the embodiment of the present application has the beneficial effect that: since the elastic sealing member includes a first part and a second part connected to each other, the first part extends into the injection hole, the second part covers the opening of the injection hole, the second part abuts against the surface of the battery cover, and the fixing member is located on the side of the second part away from the first part, the fixing member is connected to the battery cover, and the fixing member abuts against the second part, the injection hole can be sealed by the elastic sealing member, and even if there are cracks between the fixing member and the battery cover, the sealing effect of the injection hole is not greatly affected. The injection hole sealing structure provided by the present application can improve the leakage problem existing at the injection hole.

[0019] The beneficial effects of the battery provided in the present application compared with the prior art are similar to the beneficial effects of the liquid injection hole sealing structure provided in the present application compared with the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is a schematic structural diagram of a sealing structure for a liquid injection hole in one of the embodiments of the present application;

[0022] Figure 2 yes Figure 1 The exploded structural diagram of the injection hole sealing structure shown;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 yes Figure 1 A top view of the sealing structure of the injection hole shown;

[0025] Figure 5 yes Figure 4 A cross-sectional view of the sealing structure of the liquid injection hole of the battery cover along the AA direction;

[0026] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0027] Figure 7 yes Figure 1 A schematic diagram of the exploded structure of the injection hole sealing structure from another perspective;

[0028] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle.

[0029] The meanings of the marks in the figure are:

[0030] 100. Liquid injection hole sealing structure;

[0031] 10. Battery cover;

[0032] 11. Liquid injection hole; 12. Accommodation groove; 121. Positioning slope;

[0033] 20. Elastic seals;

[0034] 21. first part; 211. compression part; 22. second part;

[0035] 30. Fixing parts;

[0036] 31. Limiting groove. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] References to "one embodiment", "some embodiments" or "an embodiment" described in the specification of this application mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some other embodiments", "in some other embodiments", etc., which appear at different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, in one or more embodiments, particular features, structures or characteristics may be combined in any suitable manner.

[0041] In order to illustrate the technical solution of the present application, a description is given below in conjunction with specific drawings and embodiments.

[0042] The traditional injection hole sealing structure generally uses laser welding aluminum nails for sealing, and there is a leakage problem at the injection hole. There are two main reasons: one is that during the battery processing, electrolyte crystallization occurs around the injection hole, and there is still residue after laser cleaning, so electrolyte crystallization after laser welding will cause cracks or holes in the aluminum nail weld; the other is that the laser optical lens is aged or contaminated, which affects the shape of the laser spot and causes cracks in the aluminum nail weld. Therefore, the traditional battery cover injection hole sealing structure needs to be improved.

[0043] In order to solve the above problems, the present application provides a liquid injection hole sealing structure and a battery, which can improve the leakage problem at the liquid injection hole.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 This is a schematic diagram of the structure of the liquid injection hole sealing structure 100 in one embodiment of the present application. Figure 2 yes Figure 1The exploded structural diagram of the injection hole sealing structure 100 is shown in FIG. Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0045] In a first aspect, an embodiment of the present application provides a liquid injection hole sealing structure 100 , including a battery cover plate 10 , an elastic sealing member 20 and a fixing member 30 .

[0046] The battery cover 10 is provided with a liquid injection hole 11, and electrolyte can be added into the battery through the liquid injection hole 11 when processing the battery.

[0047] The elastic seal 20 includes a first portion 21 and a second portion 22 connected to each other. The first portion 21 extends into the injection hole 11 , and the second portion 22 covers the opening of the injection hole 11 . The second portion 22 abuts against the surface of the battery cover 10 .

[0048] The material of the elastic seal 20 can be a material that does not react with the electrolyte, such as fluororubber, butyl rubber, and silicone rubber. In this embodiment, the material of the elastic seal 20 is fluororubber. The shape of the first part 21 and the shape of the second part 22 can both be set to be columnar or block-shaped. For example, the shape of the first part 21 and the shape of the second part 22 can both be cylindrical, and the first part 21 and the second part 22 are coaxially arranged.

[0049] Since the second portion 22 covers the opening of the injection hole 11 and abuts against the surface of the battery cover 10, the second portion 22 can seal the injection hole 11. Since the first portion 21 extends into the injection hole 11, the position of the elastic sealing member 20 can be limited by the injection hole 11.

[0050] Please refer to Figure 4 , Figure 5 and Figure 6 ,in, Figure 4 yes Figure 1 The top view of the liquid injection hole sealing structure 100 is shown. Figure 5 yes Figure 4 The cross-sectional view of the liquid injection hole sealing structure 100 of the battery cover 10 along the AA direction is shown. Figure 6 yes Figure 5 A partial enlarged view of point B in the middle.

[0051] The fixing member 30 is located on a side of the second portion 22 away from the first portion 21 . The fixing member 30 is connected to the battery cover 10 , and the fixing member 30 abuts against the second portion 22 .

[0052] The fixing member 30 and the battery cover plate 10 can be connected by welding, bonding, clamping, threading, screwing or bolting. The fixing member 30 can include aluminum nails and the like.

[0053] In this embodiment, the fixing member 30 includes an aluminum nail, and the fixing member 30 is welded to the battery cover plate 10 by laser.

[0054] Since the fixing member 30 is located on the side of the second portion 22 away from the first portion 21, the fixing member 30 is connected to the battery cover 10, and the fixing member 30 is abutted against the second portion 22, the fixing member 30 can limit the elastic sealing member 20 from moving away from the injection hole 11, thereby ensuring that the second portion 22 is abutted against the surface of the battery cover 10, so that the second portion 22 seals the injection hole 11.

[0055] Furthermore, since the second portion 22 abuts against the surface of the battery cover 10, so that the second portion 22 seals the injection hole 11, even if there is a crack at the connection between the fixing member 30 and the battery cover 10, it will not affect the sealing effect of the injection hole 11. Compared with the solution of directly sealing the injection hole 11 with only the fixing member 30, the injection hole sealing structure 100 provided in the present application can improve the leakage problem existing at the injection hole 11.

[0056] When assembling the injection hole sealing structure 100 provided in the embodiment of the present application, the first part 21 can be first inserted into the injection hole 11, and the second part 22 can be abutted against the surface of the battery cover 10, and then the fixing part 30 can be connected to the battery cover 10 so that the fixing part 30 and the second part 22 can be abutted.

[0057] As can be seen from the above, the injection hole sealing structure 100 provided in the embodiment of the present application, since the elastic sealing member 20 includes a first portion 21 and a second portion 22 connected to each other, the first portion 21 extends into the injection hole 11, the second portion 22 is covered at the opening of the injection hole 11, the second portion 22 is abutted against the surface of the battery cover 10, and the fixing member 30 is located on the side of the second portion 22 away from the first portion 21, the fixing member 30 is connected to the battery cover 10, and the fixing member 30 is abutted against the second portion 22, so the injection hole 11 can be sealed by the elastic sealing member 20, and even if there are cracks between the fixing member 30 and the battery cover 10, the sealing effect of the injection hole 11 is not greatly affected. The injection hole sealing structure 100 provided in the present application can improve the leakage problem existing at the injection hole 11.

[0058] In this embodiment, the first portion 21 is interference fit with the injection hole 11 .

[0059] With such arrangement, the second portion 22 can abut against the surface of the battery cover 10 so that the second portion 22 seals the injection hole 11 , and the first portion 21 can also seal the injection hole 11 , thereby doubly sealing the injection hole 11 to improve the sealing effect of the injection hole 11 .

[0060] Specifically, one end of the first portion 21 away from the second portion 22 extends to the outside of the liquid injection hole 11 .

[0061] Such a configuration can ensure that the first part 21 fills the injection hole 11 completely, thereby improving the sealing effect of the first part 21 on the injection hole 11. At the same time, the first part 21 extending to the outside of the injection hole 11 will expand, thereby preventing the first part 21 from escaping from the injection hole 11 in a direction close to the fixing member 30.

[0062] Among them, the first part 21 located inside the injection hole 11 is the compression part 211, and the volume of the compression part 211 is D1. After the compression part 211 is moved out of the injection hole 11, the volume of the compression part 211 expands to D, (D-D1) / D=k, k is 10%-40%.

[0063] Such a configuration can ensure that the first portion 21 completely fills the liquid injection hole 11 , thereby improving the sealing effect of the first portion 21 on the liquid injection hole 11 .

[0064] It can be understood that the volume compression ratio of the compression part 211 is k.

[0065] Please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 ,in, Figure 7 yes Figure 1 The schematic diagram of the exploded structure of the liquid injection hole sealing structure 100 from another perspective is shown. Figure 8 yes Figure 7 A partial enlarged view of point C in the middle.

[0066] In this embodiment, a limiting groove 31 is provided at one end of the fixing member 30 facing the second portion 22 , and an end of the second portion 22 away from the first portion 21 is located in the limiting groove 31 , and a bottom surface of the limiting groove 31 abuts against the second portion 22 .

[0067] By adopting the above solution, the position of the second portion 22 can be limited by the limiting groove 31, thereby preventing the second portion 22 from moving randomly.

[0068] Optionally, the side wall of the limiting groove 31 includes a limiting inclined surface, and the limiting inclined surface extends from the bottom of the limiting groove 31 to the top of the limiting groove 31 in a direction away from the center of the limiting groove 31 .

[0069] With such arrangement, when the fixing member 30 and the second portion 22 are abutted against each other, it is convenient to put the end of the second portion 22 away from the first portion 21 into the limiting groove 31 .

[0070] Please continue to refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In this embodiment, the battery cover 10 is provided with a receiving groove 12 , the opening of the injection hole 11 is formed on the bottom surface of the receiving groove 12 , and the fixing member 30 is located in the receiving groove 12 .

[0071] By adopting the above solution, the position of the fixing member 30 can be limited by the accommodating groove 12, so that the fixing member 30 and the battery cover 10 can be conveniently connected together.

[0072] Specifically, the side wall of the receiving groove 12 includes a positioning bevel 121, and from the bottom of the receiving groove 12 to the top of the receiving groove 12, the positioning bevel 121 extends away from the center of the receiving groove 12, and the side surface of the fixing member 30 is arranged in close contact with the positioning bevel 121.

[0073] Such a configuration makes it easy to place the fixing member 30 into the receiving groove 12 , and in the process of placing the fixing member 30 into the receiving groove 12 , the fixing member 30 can be centered by the positioning inclined surface 121 .

[0074] For example, the fixing member 30 is configured to be in a disc shape, and the receiving groove 12 is configured to be in a cylindrical groove.

[0075] Please refer to Figures 1 to 8 In a second aspect, an embodiment of the present application provides a battery, comprising a liquid injection hole sealing structure 100 as in the first aspect.

[0076] In the battery provided by the embodiment of the present application, since the elastic seal 20 includes a first part 21 and a second part 22 connected to each other, the first part 21 extends into the injection hole 11, the second part 22 covers the opening of the injection hole 11, the second part 22 abuts against the surface of the battery cover 10, and the fixing member 30 is located on the side of the second part 22 away from the first part 21, the fixing member 30 is connected to the battery cover 10, and the fixing member 30 abuts against the second part 22, the injection hole 11 can be sealed by the elastic seal 20, and even if there are cracks between the fixing member 30 and the battery cover 10, the sealing effect of the injection hole 11 is not greatly affected. The injection hole sealing structure 100 provided by the present application can improve the leakage problem existing at the injection hole 11.

[0077] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A liquid injection hole sealing structure, characterized in that: include: A battery cover plate, wherein the battery cover plate is provided with a liquid injection hole; An elastic sealing member, the elastic sealing member comprising a first portion and a second portion connected to each other, the first portion extending into the injection hole, the second portion covering the opening of the injection hole, and the second portion abutting against a surface of the battery cover plate; A fixing member, the fixing member is located on a side of the second part away from the first part, the fixing member is connected to the battery cover, and the fixing member abuts against the second part.

2. The sealing structure of the injection hole according to claim 1, characterized in that: The first portion is interference fit with the injection hole.

3. The sealing structure of the injection hole according to claim 2, characterized in that: One end of the first portion away from the second portion extends to the outside of the liquid injection hole.

4. The sealing structure of the injection hole according to claim 1, characterized in that: The first part located inside the injection hole is a compression part, and the volume of the compression part is D1. After the compression part is removed from the injection hole, the volume of the compression part expands to D, (D-D1) / D=k, k is 10%-40%.

5. The sealing structure of the injection hole according to claim 1, characterized in that: A limiting groove is provided at one end of the fixing member facing the second part, an end of the second part facing away from the first part is located in the limiting groove, and a groove bottom surface of the limiting groove abuts against the second part.

6. The sealing structure of the injection hole according to claim 5, characterized in that: The side wall of the limiting groove comprises a limiting inclined surface, and the limiting inclined surface extends from the bottom of the limiting groove to the top of the limiting groove in a direction away from the center of the limiting groove.

7. The sealing structure for the injection hole according to any one of claims 1 to 5, characterized in that: The battery cover is provided with a receiving groove, the orifice of the injection hole is formed on the groove bottom surface of the receiving groove, and the fixing member is located in the receiving groove.

8. The sealing structure of the injection hole according to claim 7, characterized in that: The side wall of the receiving groove includes a positioning inclined surface, and the positioning inclined surface extends from the bottom of the receiving groove to the top of the receiving groove in a direction away from the center of the receiving groove, and the side surface of the fixing member is arranged in contact with the positioning inclined surface.

9. The sealing structure for the injection hole according to any one of claims 1 to 5, characterized in that: The elastic sealing element is made of fluororubber.

10. A battery, characterized in that: It comprises a liquid injection hole sealing structure as described in any one of claims 1 to 9.

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