Liquid injection sealing structure of lithium ion battery

Abstract

According to the liquid injection sealing structure of the lithium ion battery, in the structure, a liquid injection hole is of a counter bore structure, and the counter bore structure comprises a sinking groove with a first diameter and a through hole which is formed in the bottom of the sinking groove and has a second diameter; the plurality of vertical grooves are vertically distributed on the inner wall of the through hole in an array manner; the formation nail is detachably connected with the liquid injection hole, the column part comprises a cylinder and a screw hole formed in the bottom of the cylinder, and the nail part comprises a stud connecting part in threaded connection with the screw hole, a sealing part extending from the bottom of the stud connecting part and a chamfering part extending from the bottom of the sealing part; the sealing part is connected with the through hole in a sealed mode, and the vertical groove is in close contact with the sealing part. The liquid injection sealing structure replaces the nail part to prolong the use of the formation nail, the sealing effect is good, and the helium detection accuracy is high.

Description

Technical Field

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

[0002] Environmental humidity has a huge impact on the production of lithium-ion batteries. If the moisture content exceeds the standard during the production process, it may lead to a series of problems such as accelerated electrode oxidation, increased internal air pressure, reduced capacity, increased internal resistance, internal micro-short circuit, reduced charge and discharge performance, and shortened life. Therefore, the environmental humidity needs to be strictly controlled during the production of lithium-ion batteries, especially the liquid injection and packaging process requires deep dehumidification of the ambient air. At present, after a battery is injected once, the injection hole is usually sealed with a formation nail during the static process. The formation nail and the injection hole are usually interference fit, which can easily cause the formation nail to wear and deform and cannot be reused. Therefore, the existing process is to directly scrap it after using it once.

[0003] The above information disclosed in the background technology section is only used to enhance the understanding of the background of the present invention and therefore may contain information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0004] The utility model aims to provide a liquid injection sealing structure for lithium ion batteries. By dividing a formation nail into two parts, namely a nail part and a column part, if the nail part is worn, deformed and fails during use, the use of the formation nail can be extended by replacing the nail part, thereby saving production costs.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A liquid injection sealing structure of a lithium ion battery of the utility model comprises:

[0007] The injection hole is a sink hole structure, wherein the sink hole structure includes a sink groove with a first diameter and a through hole with a second diameter provided at the bottom of the sink groove;

[0008] A plurality of vertical grooves are vertically arrayed and distributed on the inner wall of the through hole;

[0009] A chemical nail is detachably connected to the injection hole, and the chemical nail comprises:

[0010] The column part includes a cylinder and a screw hole at the bottom of the cylinder.

[0011] The nail portion comprises a stud connection portion threadedly connected to the screw hole, a sealing portion extending from the bottom of the stud connection portion, and a chamfered portion extending from the bottom of the sealing portion, wherein the sealing portion is sealingly connected to the through hole and the vertical groove is in close contact with the sealing portion.

[0012] In the liquid injection sealing structure of a lithium ion battery, the through hole and the sink share a central axis.

[0013] In the liquid injection sealing structure of a lithium ion battery, the central axis of the formation nail and the central axis of the liquid injection hole are coaxial.

[0014] In the liquid injection sealing structure of a lithium ion battery, the chamfer of the chamfered portion is 10 to 30 degrees.

[0015] In the liquid injection sealing structure of a lithium ion battery, the sink is a circular groove, the through hole is a circular hole, and the sealing part is a cylindrical structure.

[0016] In the liquid injection sealing structure of a lithium ion battery, the outer wall of the through hole is provided with reinforcing ribs.

[0017] In the liquid injection sealing structure of a lithium ion battery, the first diameter is greater than the second diameter.

[0018] In the liquid injection sealing structure of a lithium ion battery, the diameter of the sealing portion is larger than the second diameter of the through hole.

[0019] In the liquid injection sealing structure of a lithium ion battery, the vertical grooves are evenly distributed on the inner wall of the through hole.

[0020] In the liquid injection sealing structure of the lithium ion battery, the liquid injection sealing structure is a centrally symmetrical structure.

[0021] In the above technical scheme, the utility model provides a lithium-ion battery injection sealing structure, which has the following beneficial effects: the utility model divides the formation nail into two parts, the nail part and the column part. During use, if the nail part is worn, deformed and fails, the use of the formation nail can be extended by replacing the nail part, saving production costs. The vertical groove can increase the friction between the injection hole and the formation nail, preventing the formation nail from falling off during the static process of the battery, resulting in sealing failure; at the same time, the groove structure setting is also conducive to the sealing nail welding the injection hole, and when the helium test is performed, the helium can flow out from the groove structure, thereby improving the accuracy of the helium test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic structural diagram of a forming nail of a liquid injection sealing structure for a lithium-ion battery provided in an embodiment of the utility model.

[0024] Figure 2 A schematic structural diagram of a nail portion of a liquid injection sealing structure for a lithium-ion battery provided in an embodiment of the utility model.

[0025] Figure 3 A structural schematic diagram of a column portion of a liquid injection sealing structure for a lithium-ion battery provided in an embodiment of the utility model.

[0026] Figure 4 A schematic cross-sectional view of a liquid injection hole of a liquid injection sealing structure of a lithium-ion battery provided in an embodiment of the utility model.

[0027] Figure 5 A schematic top view of a liquid injection hole of a liquid injection sealing structure of a lithium-ion battery provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] See also Figure 1-5 As shown, in one embodiment, a liquid injection sealing structure of a lithium-ion battery of the utility model includes:

[0037] The injection hole 3 is a countersunk hole structure, and the countersunk hole structure includes a sinking groove with a first diameter and a through hole with a second diameter provided at the bottom of the sinking groove;

[0038] A plurality of vertical grooves 31 are vertically arrayed and distributed on the inner wall of the through hole;

[0039] The chemical nail is detachably connected to the injection hole 3, and the chemical nail comprises:

[0040] The column part 1 includes a cylinder 11 and a screw hole 12 provided at the bottom of the cylinder.

[0041] The nail portion 2 includes a stud connection portion 23 threadedly connected to the screw hole 12, a sealing portion 22 extending from the bottom of the stud connection portion 23, and a chamfered portion 21 extending from the bottom of the sealing portion 22. The sealing portion 22 is sealed and connected to the through hole, and the vertical groove 31 is in close contact with the sealing portion 22.

[0042] In a preferred embodiment of the liquid injection sealing structure for a lithium-ion battery, the through hole and the sink share a common central axis.

[0043] In a preferred embodiment of the liquid injection sealing structure of a lithium-ion battery, the central axis of the formation nail and the central axis of the liquid injection hole 3 are coaxial.

[0044] In a preferred embodiment of the liquid injection sealing structure of a lithium-ion battery, the chamfer of the chamfered portion 21 is 10 to 30 degrees.

[0045] In a preferred embodiment of the liquid injection sealing structure of a lithium-ion battery, the sink is a circular groove, the through hole is a circular hole, and the sealing portion 22 is a cylindrical structure.

[0046] In a preferred embodiment of the liquid injection sealing structure of a lithium-ion battery, a reinforcing rib 32 is provided on the outer wall of the through hole.

[0047] In a preferred embodiment of the liquid injection sealing structure for a lithium-ion battery, the first diameter is greater than the second diameter.

[0048] In a preferred embodiment of the liquid injection sealing structure of a lithium-ion battery, the diameter of the sealing portion 22 is larger than the second diameter of the through hole.

[0049] In a preferred embodiment of the liquid injection sealing structure of a lithium-ion battery, the vertical grooves 31 are evenly distributed on the inner wall of the through hole.

[0050] In a preferred embodiment of the liquid injection sealing structure of a lithium ion battery, the liquid injection sealing structure is a centrally symmetrical structure.

[0051] In one embodiment, the nail portion 2 and the column portion 1 are connected through the threaded hole 12 and the stud connection portion 23 during use. The chamfer of the chamfered portion 21 is 10 to 30 degrees, which facilitates the insertion of the nail into the injection hole; during use, the nail is sealed with the injection hole through the sealing portion 22, and the sealing portion 22 is easily worn, deformed and failed during this process. If the sealing portion 22 is worn, deformed and failed, the use of the nail can be extended by replacing the nail portion 2, thereby saving production costs.

[0052] In one embodiment, the vertical groove 31 can increase the friction between the injection hole and the formation nail to prevent the formation nail from falling off during the static process of the battery, resulting in sealing failure; further, the groove structure setting of the sinker is also beneficial to the helium gas flowing out of the groove structure during the helium inspection after the sealing nail is welded to the injection hole, thereby improving the accuracy of the helium inspection.

[0053] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0054] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A liquid injection sealing structure for a lithium ion battery, characterized in that: These include, The injection hole is a sink hole structure, wherein the sink hole structure includes a sink groove with a first diameter and a through hole with a second diameter provided at the bottom of the sink groove; A plurality of vertical grooves are vertically arrayed and distributed on the inner wall of the through hole; A chemical nail is detachably connected to the injection hole, and the chemical nail comprises: The column part includes a cylinder and a screw hole at the bottom of the cylinder. The nail portion comprises a stud connection portion threadedly connected to the screw hole, a sealing portion extending from the bottom of the stud connection portion, and a chamfered portion extending from the bottom of the sealing portion, wherein the sealing portion is sealingly connected to the through hole and the vertical groove is in close contact with the sealing portion.

2. A lithium ion battery liquid injection sealing structure according to claim 1, characterized in that: The through hole and the sink share a central axis.

3. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The central axis of the chemically formed nail is coaxial with the central axis of the injection hole.

4. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The chamfered portion has a chamfer angle of 10 to 30 degrees.

5. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The sink groove is a circular groove, the through hole is a circular hole, and the sealing part is a cylindrical structure.

6. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The outer wall of the through hole is provided with reinforcing ribs.

7. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The first diameter is greater than the second diameter.

8. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The diameter of the sealing portion is greater than the second diameter of the through hole.

9. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The vertical grooves are evenly distributed on the inner wall of the through hole.

10. The liquid injection sealing structure of a lithium ion battery according to claim 1, characterized in that: The liquid injection sealing structure is a centrally symmetrical structure.

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