Sealing nail of rechargeable battery, sealing structure and rechargeable battery

Abstract

The utility model provides a sealing nail of a rechargeable battery, a sealing structure and a rechargeable battery. The sealing nail has a through hole penetrating along the axial direction, and the cross-sectional area of ​​the through hole is 100 μm. 2 ‑1000000μm 2 The sealing nail of the rechargeable battery provided in the present application can effectively prevent the influence of exhaust gas on welding during the welding process of the sealing nail, prevent the occurrence of cold welding, explosion points and even cracks in the weld, and greatly improve the reliability of the sealing nail welding.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of rechargeable batteries, in particular to a sealing nail of a rechargeable battery, a sealing structure and a rechargeable battery. Background Art

[0002] At present, after the rechargeable battery injects electrolyte into the shell through the injection hole on the battery top cover, it is necessary to install sealing nails on the top cover and seal the battery through laser welding. Since laser welding is prone to laser welding explosion points and cracks at the weld, the sealing rate of the battery is relatively low. The existing technology usually adopts the method of setting an exhaust gas accommodating space in the top cover to reduce the air pressure between the sealing nail and the top cover. Although this method can reduce the impact of exhaust gas on welding to a certain extent, the high-temperature exhaust gas in the exhaust gas accommodating space may still rush out of the weak welding area to produce explosion points. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a sealing nail of a rechargeable battery, a sealing structure and a rechargeable battery, which can effectively prevent the influence of exhaust gas on welding during the welding process of the sealing nail.

[0004] In order to solve the above technical problems, the utility model provides a sealing nail of a rechargeable battery, wherein the sealing nail has a through hole penetrating along the axial direction, and the cross-sectional area of ​​the through hole is 100 μm 2 -1000000μm 2 between.

[0005] Optionally, the cross-sectional area of ​​the through hole is 10000 μm 2 -250000μm 2 between.

[0006] Optionally, the through hole is located at the axial center of the sealing pin.

[0007] Optionally, the upper surface of the sealing pin has an annular groove, and the annular groove has a depth of 50-800 μm and a width of 100-1000 μm.

[0008] Optionally, the edge of the lower surface of the sealing nail has a circle of protrusions.

[0009] To solve the above technical problems, the utility model provides a sealing structure of a rechargeable battery, including a top cover and a sealing nail, wherein the top cover has an injection hole and a groove located above the injection hole, and the sealing nail is suitable for being installed in the groove, and the sealing nail is the sealing nail as described above.

[0010] Optionally, the top cover has an injection hole and a groove located above the injection hole, the sealing pin is installed in the groove, the outer peripheral surface of the sealing pin is welded to the inner edge of the groove, the sealing pin has an axial hole, and the upper surface of the sealing pin has a molten pool that closes the hole.

[0011] Optionally, the cross-sectional area of ​​the hole is 100 μm 2 -1000000μm 2 between.

[0012] Optionally, the cross-sectional area of ​​the hole is 10000 μm 2 -250000μm 2 between.

[0013] Optionally, the hole and the molten pool are located at the axial center of the sealing pin.

[0014] Optionally, the edge of the lower surface of the sealing pin has a circle of protrusions, so that an accommodation space is formed between the sealing pin and the groove, and the hole is normally connected to the accommodation space.

[0015] In order to solve the above technical problems, the utility model provides a rechargeable battery, comprising the sealing structure as described above.

[0016] Compared with the prior art, the utility model can release waste gas during welding by arranging through holes on the sealing pins, effectively avoiding the influence of waste gas on the welds, preventing the welds from having cold welds, burst points and even cracks, and greatly improving the reliability of sealing pin welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present utility model. In the accompanying drawings:

[0018] Figure 1 It is a top view of a rechargeable battery sealing nail in one embodiment of the present application.

[0019] Figure 2 It is a cross-sectional view of a rechargeable battery sealing nail in one embodiment of the present application.

[0020] Figure 3 This is a schematic structural diagram of a rechargeable battery sealing structure before welding in one embodiment of the present application.

[0021] Figure 4 It is a schematic structural diagram of a rechargeable battery sealing structure after welding in one embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0023] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0028] This application refers to Figure 1 , Figure 2 A sealing nail 10 for a rechargeable battery (hereinafter referred to as "sealing nail 10") is proposed. In order to better introduce the structure of the sealing nail 10, now refer to Figure 3 and Figure 4 A sealing structure 20 (hereinafter referred to as “sealing structure 20 ”) of a rechargeable battery adapted to a sealing nail 10 is provided. Figure 1 A top view of the sealing nail 10 is shown, Figure 2 A cross-sectional view of a sealing pin 10 is shown. Figure 3 shows a schematic structural diagram of the sealing structure of the through hole 101 before welding, Figure 4 The schematic structural diagram of the sealing structure after the through hole 101 is welded is shown.

[0029] Reference Figure 3 The sealing structure 20 includes a top cover 201 and a sealing pin 10. The top cover 201 has a liquid injection hole 202 and a groove 203 located above the liquid injection hole 202. The sealing pin 10 is suitable for being installed in the groove 203, and the outer peripheral surface of the sealing pin 10 is welded to the inner edge of the groove 203 during the laser welding process.

[0030] Return to reference Figure 1 and Figure 2 Before the sealing pin 10 is welded, the sealing pin 10 has a through hole 101 extending axially therethrough. The through hole 101 is used to release gas during the welding process of the sealing pin 10. For this purpose, the cross-sectional area of ​​the through hole 101 is about 100 μm. 2 -1000000μm 2 The through hole 101 should not be too small to hinder the release of gas, nor too large to make subsequent sealing difficult. Preferably, the cross-sectional area of ​​the through hole 101 is between 10000 μm 2 -250000μm 2 In this example, the through hole 101 is located at the axial center of the sealing pin 10. However, it is understood that the through hole 101 can be set at a position deviating from the axial center. The upper surface of the sealing pin 10 also includes an annular groove 102, referring to Figure 2 , with a depth h of 50-800μm and a width w of 100-1000μm to release the stress generated during laser welding.

[0031] According to the above, the lower edge of the sealing pin 10 has a circle of protrusions 103. Figure 3 As shown, during the welding process of the sealing pin 10 and the groove 203, a receiving space S is automatically formed between the sealing pin 10 and the groove 203. During the welding process of the outer peripheral surface of the sealing pin 10 and the groove 203 but before the through hole 101 is welded, the exhaust gas generated by welding will enter the through hole 101 through the receiving space S to release the exhaust gas. Therefore, the exhaust gas will not gather in the receiving space S, and will not be able to leak from the weld to cause cold welding, explosion points, etc. Figure 4 After the outer peripheral surface of the sealing pin 10 and the groove 203 are welded, continue to weld the through hole 101. Specifically, the laser hits the inner wall of the through hole at an inclined angle to melt and fill the hole, forming a molten pool 204, which forms a seal after solidification. Below the molten pool 204 is the hole 205 that has been closed. The upper surface of the sealing pin 10 has a molten pool 204 that closes the hole 205, which can achieve the reliability of the sealing of the sealing pin 10. It can be understood that in the embodiment of the present application, the cross-sectional area of ​​the hole 205 is also 100μm 2 -1000000μm 2 Preferably, the cross-sectional area of ​​the hole 205 is between 10000 μm 2 -250000μm 2 After welding is completed, the hole 205 and the molten pool 204 are located in the axial center of the sealing pin 10 .

[0032] like Figure 3 and Figure 4As shown, the through hole 101 and the closed hole 205 are both connected to the accommodating space S under normal conditions. In particular, the hole 205 is both connected to the accommodating space S under normal conditions, and the complete sealing of the sealing nail 10 depends on the sealing of the hole 205. This structural design can avoid the complex structure caused by setting a sealing structure (such as an openable and closable sealing structure) in the accommodating space S, reduce component costs, and improve the reliability of the structure.

[0033] The present application also provides a rechargeable battery, comprising a housing, a battery cell and a top cover. The battery cell is located in the housing, and the top cover cooperates with the housing to form a closed space. The top cover has the above-mentioned sealing structure 20.

[0034] Therefore, the present application can release waste gas during welding through the through hole and raised sealing pin design, effectively avoid the impact of waste gas on the weld, prevent the weld from having cold welds, burst points and even cracks, and greatly improve the reliability of sealing pin welding.

[0035] The basic concepts have been described above. Obviously, for those skilled in the art, the above utility model disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to the present application. Such modifications, improvements and corrections are suggested in the present application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present application.

[0036] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0037] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0038] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0039] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A sealing nail for a rechargeable battery, characterized in that: The sealing nail has a through hole extending axially therethrough, and the cross-sectional area of ​​the through hole is 100 μm. 2 -1000000μm 2 between.

2. The sealing nail of the rechargeable battery as claimed in claim 1, characterized in that: The cross-sectional area of ​​the through hole is 10000 μm 2 -250000μm 2 between.

3. The sealing nail of the rechargeable battery as claimed in claim 1, characterized in that: The through hole is located at the axial center of the sealing pin.

4. The sealing nail of a rechargeable battery as claimed in claim 1, characterized in that: The upper surface of the sealing pin is provided with an annular groove, the depth of the annular groove is 50-800 μm, and the width is 100-1000 μm.

5. The sealing nail of a rechargeable battery as claimed in claim 1, characterized in that: The edge of the lower surface of the sealing nail is provided with a circle of protrusions.

6. A sealing structure of a rechargeable battery, comprising a top cover and a sealing pin, wherein the top cover has a liquid injection hole and a groove located above the liquid injection hole, and the sealing pin is suitable for being installed in the groove, characterized in that: The sealing nail is the sealing nail as described in any one of claims 1 to 5.

7. A sealing structure of a rechargeable battery, comprising a top cover and a sealing pin, wherein the top cover has a liquid injection hole and a groove located above the liquid injection hole, and the sealing pin is installed in the groove, characterized in that: The outer peripheral surface of the sealing pin is welded to the inner edge of the groove, the sealing pin has a hole along the axial direction, and the upper surface of the sealing pin has a molten pool that closes the hole.

8. The sealing structure of a rechargeable battery as claimed in claim 7, characterized in that: The cross-sectional area of ​​the pores is 100 μm 2 -1000000μm 2 between.

9. The sealing structure of a rechargeable battery as claimed in claim 7, characterized in that: The cross-sectional area of ​​the pores is 10000 μm 2 -250000μm 2 between.

10. The sealing structure of a rechargeable battery as claimed in claim 7, characterized in that: The hole and the molten pool are located at the axial center of the sealing pin.

11. The sealing structure of a rechargeable battery as claimed in claim 7, characterized in that: The lower surface edge of the sealing pin has a circle of protrusions, so that a receiving space is formed between the sealing pin and the groove, and the hole is normally connected to the receiving space.

12. A rechargeable battery comprising the sealing structure according to any one of claims 7 to 11.

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