Battery top cover, battery top cover assembly and battery

Abstract

The utility model relates to a battery top cover, a battery top cover assembly and a battery. The battery top cover comprises a top cover body and a first sealing nail, and the top cover body is provided with a liquid injection hole penetrating through the two sides of the top cover body; the first sealing nail comprises a column body, a first sealing part arranged at one end of the column body and a second sealing part arranged at the other end of the column body, the column body is arranged on the liquid injection hole in an interference penetrating mode, and the first sealing part and the second sealing part are tightly attached to the two sides of the top cover body respectively. The battery top cover has better sealing performance.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery top cover and its components and a battery. Background Art

[0002] After the second injection of lithium-ion batteries, sealing nails are generally used to pre-seal the injection holes to ensure that the newly injected electrolyte does not leak. The sealing nails rely on the friction with the injection holes to fix the position. Batteries in related technologies are prone to the situation where the battery shell is squeezed and deformed during subsequent transportation and use, and the sealing nails are squeezed out of the battery injection hole or fall into the battery through the battery injection hole, causing the seal to fail or foreign matter to enter the battery, causing adverse consequences to the safety of the battery and its performance. For example, in the subsequent use process, when the battery produces gas after a certain amount of charging and discharging, the internal air pressure of the battery increases. When the pressure applied to the sealing nail by the internal air pressure is greater than the friction, the sealing nail may be pushed out, and the sealing nail will no longer provide a sealing effect. Utility Model Content

[0003] Based on this, it is necessary to provide a battery top cover with better sealing performance to address the above problems.

[0004] A battery top cover, comprising:

[0005] A top cover body having injection holes penetrating through two sides of the top cover body; and

[0006] The first sealing nail includes a column, a first sealing portion arranged at one end of the column and a second sealing portion arranged at the other end of the column. The column is interference-pierced on the injection hole, and the first sealing portion and the second sealing portion are respectively tightly attached to both sides of the top cover body.

[0007] In some optional embodiments, the top cover body includes a top cover sheet and a lower insulating member disposed on the top cover sheet, the top cover sheet has a first hole segment penetrating through both sides of the top cover sheet, the lower insulating member has a second hole segment penetrating through both sides of the lower insulating member, and the injection hole includes the first hole segment and the second hole segment;

[0008] The column is interference-pierced on the first hole section, the first sealing portion is tightly attached to the side of the top cover sheet away from the lower insulating member, and the second sealing portion is located between the top cover sheet and the lower insulating member and tightly attached to the side of the top cover sheet close to the lower insulating member.

[0009] In some optional embodiments, the outer diameter of the second sealing portion is larger than the hole diameter of the second hole segment.

[0010] In some optional embodiments, the second sealing portion is also in close contact with a side of the lower insulating member close to the top cover sheet.

[0011] In some optional embodiments, the first hole segment is a countersunk hole, the first hole segment includes a first hole portion and a second hole portion that are connected, the first hole portion, the second hole portion and the second hole segment are arranged in sequence, the inner diameter of the first hole portion is larger than the inner diameter of the second hole portion, the column is interference-pierced through the second hole portion, and the first sealing portion is tightly attached to the interface between the first hole portion and the second hole portion;

[0012] The battery top cover further includes a second sealing nail, and the second sealing nail seals the first hole portion.

[0013] In some optional embodiments, the first sealing nail is a sealing glue nail, and the second sealing nail is a sealing aluminum nail.

[0014] The present application also provides a battery, characterized in that it includes the above-mentioned battery top cover.

[0015] The present application also provides a battery top cover assembly, including:

[0016] A top cover body having injection holes penetrating through two sides of the top cover body; and

[0017] The first sealing nail includes a column and a first sealing portion arranged at one end of the column, the column is used to be inserted into the injection hole through interference, and a second sealing portion is formed at one end of the column away from the first sealing portion during the interference insertion process, and the first sealing portion and the second sealing portion are respectively tightly attached to both sides of the top cover body.

[0018] In some optional embodiments, the top cover body includes a top cover sheet and a lower insulating member disposed on the top cover sheet, the top cover sheet has a first hole segment penetrating through both sides of the top cover sheet, the lower insulating member has a second hole segment penetrating through both sides of the lower insulating member, and the injection hole includes the first hole segment and the second hole segment;

[0019] The column is interference-pierced on the first hole section, the first sealing portion is closely attached to the side of the top cover sheet away from the lower insulating member, and the second sealing portion is located between the top cover sheet and the lower insulating member and closely attached to the side of the top cover sheet close to the lower insulating member;

[0020] The outer diameter of the column is 1.03-1.1 times the inner diameter of the first hole segment, and the length of the column is 0.3-0.7 cm greater than the length of the first hole segment.

[0021] In some optional embodiments, the column includes a main body portion and an insertion portion connected to each other, an end of the main body portion away from the insertion portion is connected to the first sealing portion, and an outer diameter of the insertion portion gradually decreases in the direction from the main body portion to the insertion portion.

[0022] In the battery top cover, the column and the injection hole are interference fit, and the first sealing part and the second sealing part are respectively tightly attached to the two sides of the top cover body, so that there is a triple seal between the first sealing nail and the injection hole, and thus the battery top cover has a good sealing performance. In addition, in the battery top cover, since the first sealing part and the second sealing part of the first sealing nail can provide limit in two directions, it can effectively prevent the first sealing nail from being squeezed out of the injection hole or falling into the battery housing through the injection hole during the transportation and use of the battery with the battery top cover, thereby preventing the battery seal from failing or foreign matter from entering the battery, and avoiding adverse consequences on the safety and performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 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 work.

[0024] Figure 1 This is a schematic diagram of the structure of a battery top cover in an embodiment of the present application;

[0025] Figure 2 For along Figure 1 The cross-section diagram of line AA in ;

[0026] Figure 3 for Figure 2 A local enlarged view of point B in FIG.

[0027] Figure 4 This is a schematic structural diagram of a first sealing pin in an unassembled state in an embodiment of the present application;

[0028] Figure 5 Schematic diagram of the structure of a first sealing pin in an unassembled state in another embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, 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", "axial", "radial", "circumferential" 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 application 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 application.

[0031] 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 at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] like Figure 1-Figure 3 As shown, the present application discloses a battery top cover 10. The battery top cover 10 includes a top cover body 200 and a first sealing nail 300. The top cover body 200 has a liquid injection hole 200a that penetrates both sides of the top cover body 200. When the battery top cover 10 is assembled on a battery shell having a battery cell, electrolyte can be injected into the shell through the liquid injection hole 200a to provide the electrolyte required for the battery cell to work. After the liquid injection is completed, the liquid injection hole 200a can be sealed by the first sealing nail 300.

[0036] The first sealing nail 300 includes a column 310, a first sealing portion 320 provided at one end of the column 310, and a second sealing portion 330 provided at the other end of the column 310. The column 310 is inserted through the injection hole 200a. The first sealing portion 320 and the second sealing portion 330 are respectively attached to both sides of the top cover body 200.

[0037] In the battery top cover 10, the column 310 is interference fit with the injection hole 200a, and the first sealing part 320 and the second sealing part 330 are respectively closely attached to the two sides of the top cover body 200, so that there is a triple seal between the first sealing nail 300 and the injection hole 200a, thereby making the battery top cover 10 have a good sealing performance. In addition, in the battery top cover 10, since the first sealing part 320 and the second sealing part 330 of the first sealing nail 300 can provide two-way limit, during the process of transporting and using the battery with the battery top cover 10, it can effectively prevent the first sealing nail 300 from being squeezed out of the injection hole 200a or falling into the battery shell through the injection hole 200a, thereby preventing the battery seal from failing or foreign matter from entering the battery, and avoiding adverse consequences on the safety and performance of the battery.

[0038] In some optional embodiments of the present application, the top cover body 200 includes a top cover sheet 210 and a lower insulating member 220. The top cover sheet 210 has a first hole section 212 that passes through both sides of the top cover sheet 210. The lower insulating member 220 is disposed on the top cover sheet 210. The lower insulating member 220 has a second hole section 222 that passes through both sides of the lower insulating member 220. The injection hole 200a includes a first hole section 212 and a second hole section 222. The column 310 is interference-pierced in the first hole section 212. The first sealing portion 320 is tightly attached to a side of the top cover sheet 210 away from the lower insulating member 220. The second sealing portion 330 is located between the top cover sheet 210 and the lower insulating member 220 and is tightly attached to a side of the top cover sheet 210 close to the lower insulating member 220. It should be noted that after the top cover sheet 210 and the lower insulating member 220 are assembled together, there will be a gap between the top cover sheet 210 and the lower insulating member 220 in the area near the injection hole 200a, so that the second sealing portion 330 can be located in the gap between the top cover sheet 210 and the lower insulating member 220.

[0039] In the battery top cover 10, the second sealing portion 330 is located between the top cover sheet 210 and the lower insulating member 220, and the first sealing portion 320 and the second sealing portion 330 are respectively in close contact with the two sides of the top cover sheet 210, so that the force of the column 310 can be balanced to prevent the column 310 from tilting and deforming. It can be understood that in some optional embodiments, the second sealing portion 330 may not be located between the top cover sheet 210 and the lower insulating member 220, but is located on the side of the lower insulating member 220 away from the top cover sheet 210 and in close contact with the side of the lower insulating member 220 away from the top cover sheet 210.

[0040] In some optional embodiments of the present application, the outer diameter of the second sealing portion 330 is greater than the aperture of the second hole segment 222. In this way, the lower insulating member 220 has a limiting effect on the second sealing portion 330, which can further prevent the first sealing nail 300 from falling into the battery housing through the injection hole 200a, so that the battery can have a better sealing effect during long-term use. It can be understood that in some optional embodiments, the outer diameter of the second sealing portion 330 can also be less than or equal to the aperture of the second hole segment 222.

[0041] In some optional embodiments of the present application, the second sealing portion 330 is also in close contact with the side of the lower insulating member 220 close to the top cover sheet 210. In this way, the second sealing portion 330 can be better in close contact with the top cover sheet 210, so that the battery can have a better sealing effect during long-term use. It can be understood that in some optional embodiments, the second sealing portion 330 can also be spaced from the side of the lower insulating member 220 close to the top cover sheet 210.

[0042] In some optional embodiments of the present application, the first hole section 212 is a countersunk hole. The first hole section 212 includes a first hole portion 212a and a second hole portion 212b that are connected. The first hole portion 212a, the second hole portion 212b and the second hole section 222 are arranged in sequence, and the inner diameter of the first hole portion 212a is greater than the inner diameter of the second hole portion 212b. The cylinder 310 is interference-pierced on the second hole portion 212b. The first sealing portion 320 is tightly attached to the interface between the first hole portion 212a and the second hole portion 212b. In this way, the first sealing nail 300 can be avoided from being exposed, thereby effectively protecting the first sealing nail 300. It can be understood that in some optional embodiments, the first hole section 212 can also be a through hole with a consistent inner diameter.

[0043] In some optional embodiments of the present application, the battery top cover 10 further includes a second sealing nail 400. The second sealing nail 400 seals the first hole portion 212a. The second sealing nail 400 can further seal the injection hole 200a, so that the battery top cover 10 can have better sealing performance. It can be understood that in some optional embodiments, the second sealing nail 400 can be omitted.

[0044] In some optional embodiments of the present application, the first sealing nail 300 is a sealing nail. The second sealing nail 400 is a sealing aluminum nail. In the related art, the sealing nail is only used as a temporary sealing component, and it is usually necessary to weld a sealing aluminum nail on top of the sealing nail by laser welding to provide a long-term sealing effect. When welding the sealing aluminum nail, the high temperature generated by the laser will cause the residual electrolyte and other pollutants to vaporize, affecting the stability of the laser welding molten pool, generating explosion points, and causing poor airtightness. At the same time, since the sealing nail provides a temporary sealing ability, the sealing is very good. Although there are defects during welding, when the sealing of the battery is tested by conventional helium testing and other methods, a qualified sealing result will be obtained, resulting in defects such as tiny pinholes and cracks in the welding of the sealing aluminum nail, which are difficult to detect by conventional helium testing and other methods, and there is a risk of defective products flowing out (because in the subsequent handling and use of the battery, once the sealing nail can no longer provide a sealing effect, it will cause the battery with welding defects to be unqualified in sealing and become a defective product). That is, although the battery in the related art is double-sealed with sealing glue nails and sealing aluminum nails, it is still easy to have unqualified sealing problems. In the above-mentioned battery top cover 10, since the first sealing nail 300 can effectively improve the sealing performance of the battery, even if there are welding defects when welding the sealing aluminum nails, the battery can have better sealing performance. It can be understood that in some optional embodiments, the first sealing nail 300 and the second sealing nail 400 can both be sealing glue nails or sealing aluminum nails. It can be understood that in some optional embodiments, the first sealing nail 300 can also be a sealing aluminum nail, and the second sealing nail 400 can be a sealing glue nail.

[0045] In some optional embodiments of the present application, such as Figure 3 and Figure 4 As shown, the first sealing nail 300 can be deformed. The first sealing nail 300 includes a column 310 and a first sealing portion 320 provided at one end of the column 310. The column 310 is used to be inserted in the injection hole 200a by interference, and a second sealing portion 330 is formed at one end of the column 310 away from the first sealing portion 320 during the interference insertion process, and the first sealing portion 320 and the second sealing portion 330 are respectively closely attached to the two sides of the top cover body 200. At this time, the top cover body 200 that is not assembled together and the first sealing nail 300 that is not deformed (the first sealing nail 300 in an unassembled state) are both components of the battery top cover 10.

[0046] The first sealing nail 300 in an unassembled state does not include the second sealing portion 330, which makes it very convenient to assemble the first sealing nail 300 in an unassembled state on the top cover body 200. At the same time, since the first sealing nail 300 in an unassembled state has the first sealing portion 320, during assembly, the force-bearing area of ​​the first sealing nail 300 can be the area of ​​the first sealing portion 320, which has a larger force-bearing area than the area of ​​the column 310. Therefore, the surface of the top cover body 200 that is in close contact with the first sealing portion 320 is subject to less resistance, which can prevent the first sealing nail 300 from being installed crookedly or over-installed (the worker has too much strength, presses too deep, and needs to be reworked), thereby improving assembly efficiency and making assembly more convenient. It can be understood that in some optional embodiments, such as Figure 5 As shown, the first sealing nail 300 in the unassembled state and the first sealing nail 300 in the assembled state may both have the second sealing portion 330 .

[0047] In some optional embodiments of the present application, such as Figure 3 and Figure 4 As shown, the outer diameter of the column 310 is 1.03-1.1 times the inner diameter of the first hole section 212 (second hole section 212b), and the length of the column 310 is 0.3-0.7 cm greater than the length of the first hole section 212 (second hole section 212b). In this way, it is very convenient for the column 310 to be inserted into the injection hole 200a through interference, and the second sealing portion 330 is formed at the end of the column 310 away from the first sealing portion 320 during the interference insertion process, and the first sealing portion 320 is closely attached to the side of the top cover sheet 210 away from the lower insulating member 220, and the second sealing portion 330 is located between the top cover sheet 210 and the lower insulating member 220 and closely attached to the side of the top cover sheet 210 close to the lower insulating member 220.

[0048] In some optional embodiments of the present application, the inner diameter of the first hole segment 212 is 3 cm, the outer diameter of the column 310 is 3.15 cm, and the length of the column 310 is 0.5 cm greater than the length of the first hole segment 212, wherein the tolerance is plus or minus 0.02 cm.

[0049] In some optional embodiments of the present application, the column 310 includes a main body 312 and an insertion portion 314 connected to each other. One end of the main body 312 away from the insertion portion 314 is connected to the first sealing portion 320. In the direction from the main body 312 to the insertion portion 314, the outer diameter of the insertion portion 314 gradually decreases. In this way, it is easier to install the first sealing nail 300 on the injection hole 200a. It can be understood that in some optional embodiments, the outer diameter of the column 310 can also be the same everywhere.

[0050] In some optional embodiments of the present application, the column 310 is cylindrical. The first sealing portion 320 is circular, and the first sealing portion 320 is concentrically arranged with the column 310. In this way, it is easier to manufacture the first sealing nail 300. It can be understood that in some optional embodiments, the column 310 and the first sealing portion 320 can also be square.

[0051] The present application also discloses a battery, which includes the battery top cover 10 mentioned above.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery top cover, characterized in that: include: A top cover body, having injection holes penetrating through two sides of the top cover body; as well as The first sealing nail includes a column, a first sealing portion arranged at one end of the column and a second sealing portion arranged at the other end of the column. The column is interference-pierced on the injection hole, and the first sealing portion and the second sealing portion are respectively tightly attached to both sides of the top cover body.

2. The battery top cover according to claim 1, characterized in that: The top cover body comprises a top cover sheet and a lower insulating member arranged on the top cover sheet, the top cover sheet has a first hole section penetrating through both sides of the top cover sheet, the lower insulating member has a second hole section penetrating through both sides of the lower insulating member, and the injection hole comprises the first hole section and the second hole section; The column is interference-pierced on the first hole section, the first sealing portion is tightly attached to the side of the top cover sheet away from the lower insulating member, and the second sealing portion is located between the top cover sheet and the lower insulating member and tightly attached to the side of the top cover sheet close to the lower insulating member.

3. The battery top cover according to claim 2, characterized in that: The outer diameter of the second sealing portion is greater than the hole diameter of the second hole section.

4. The battery top cover according to claim 3, characterized in that: The second sealing portion is also in close contact with a side of the lower insulating member close to the top cover sheet.

5. The battery top cover according to claim 2, characterized in that: The first hole section is a countersunk hole, the first hole section includes a first hole portion and a second hole portion that are connected, the first hole portion, the second hole portion and the second hole section are arranged in sequence, the inner diameter of the first hole portion is larger than the inner diameter of the second hole portion, the column is interference-pierced through the second hole portion, and the first sealing portion is tightly attached to the interface between the first hole portion and the second hole portion; The battery top cover further includes a second sealing nail, and the second sealing nail seals the first hole portion.

6. The battery top cover according to claim 5, characterized in that: The first sealing nail is a sealing glue nail, and the second sealing nail is a sealing aluminum nail.

7. A battery, characterized in that: Comprising a battery top cover as described in any one of claims 1-6.

8. A battery top cover assembly, characterized in that: include: A top cover body, having injection holes penetrating through two sides of the top cover body; as well as The first sealing nail includes a column and a first sealing portion arranged at one end of the column, the column is used to be inserted into the injection hole through interference, and a second sealing portion is formed at one end of the column away from the first sealing portion during the interference insertion process, and the first sealing portion and the second sealing portion are respectively tightly attached to both sides of the top cover body.

9. The battery top cover assembly as claimed in claim 8, characterized in that: The top cover body comprises a top cover sheet and a lower insulating member arranged on the top cover sheet, the top cover sheet has a first hole section penetrating through both sides of the top cover sheet, the lower insulating member has a second hole section penetrating through both sides of the lower insulating member, and the injection hole comprises the first hole section and the second hole section; The column is interference-pierced on the first hole section, the first sealing portion is closely attached to the side of the top cover sheet away from the lower insulating member, and the second sealing portion is located between the top cover sheet and the lower insulating member and closely attached to the side of the top cover sheet close to the lower insulating member; The outer diameter of the column is 1.03-1.1 times the inner diameter of the first hole segment, and the length of the column is 0.3-0.7 cm greater than the length of the first hole segment.

10. The battery top cover assembly as claimed in claim 8, characterized in that: The column comprises a main body and an inserting portion connected to each other. One end of the main body away from the inserting portion is connected to the first sealing portion. In the direction from the main body to the inserting portion, the outer diameter of the inserting portion gradually decreases.

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