Sealing structure for top cover, battery top cover, battery and electric device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a sealing structure for a top cover, which comprises a main body and a liquid injection hole sealed by a sealing nail, the sealing nail comprises a sealing nail cover and a sealing rubber nail, and the sealing structure also comprises a sealing piece and a limiting piece, the sealing piece is arranged between the sealing nail cover and the main body in contact with the sealing nail cover; the limiting piece penetrates through the first mounting hole and the second mounting hole to be fixedly mounted in the mounting groove, and the limiting piece is used for fixing the sealing rubber nail; the sealing rubber nail and the inner wall, making contact with the sealing rubber nail, of the liquid injection hole are provided with thread structures matched with each other. The sealing performance of the sealing rubber nail is improved by using the limiting piece and the threaded structure, and meanwhile, the sealing performance of the sealing nail cover is improved by using the sealing piece, so that the condition that electrolyte overflows from the liquid injection hole is avoided. In addition, the utility model also discloses a battery top cover comprising the sealing structure, a battery and an electric device.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a sealing structure for a top cover, a battery top cover, a battery and an electrical device. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium-ion batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides a broad space for the application and development of lithium-ion batteries.

[0003] Among them, the battery cover is one of the important components of the battery. The battery cover is provided with an injection hole for injecting electrolyte into the battery or replenishing electrolyte. In order to prevent the subsequent leakage of the injection hole, the injection hole needs to be sealed. A sealing nail is inserted into the injection hole and is interference fit with the inner wall of the injection hole for sealing. This sealing method makes the sealing nail have the risk of falling out of the injection hole during use, resulting in electrolyte leakage. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to provide a sealing structure for a top cover to address the deficiencies of the prior art, which further increases the sealing performance of the sealing nail by providing a sealing member, a limit member and a threaded structure, thereby reducing the possibility of electrolyte overflowing from the injection hole.

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

[0006] A sealing structure for a top cover, comprising a main body and a liquid injection hole arranged in the main body, wherein the liquid injection hole is sealed by a sealing nail, wherein the sealing nail comprises a sealing nail cover and a sealing glue nail in sequence in the height direction of the sealing structure, wherein the sealing nail cover is located above the sealing glue nail, and the sealing nail cover is used for welding with the main body, and further comprising:

[0007] A sealing member, the sealing member being arranged between the sealing nail cover and the main body in contact with the sealing nail cover;

[0008] The limiting member is provided with a first mounting hole on the sealing nail cover, the sealing nail is provided with a second mounting hole matching the first mounting hole, the main body is provided with a mounting groove corresponding to the second mounting hole, and the limiting member passes through the first mounting hole and the second mounting hole and is fixedly installed in the mounting groove;

[0009] The sealing glue nail and the inner wall of the injection hole in contact with the sealing glue nail are both provided with mutually matching thread structures.

[0010] In the utility model, the limiter can prevent the sealing nail cover from rotating, the threaded structure can enhance the connection stability between the sealing nail and the cover plate body, and play a better sealing role. The seal can release the stress generated when the sealing nail cover and the body are welded, and can avoid the generation of welding cracks. At the same time, the sealing nail is squeezed by the sealing nail cover and the sealing clamp to achieve a double sealing effect on the sealing nail. The joint action of the limiter, the threaded structure and the seal increases the reliability of the sealing structure and reduces the risk of electrolyte overflowing from the injection hole.

[0011] As an improvement of the sealing structure for the top cover described in the utility model, the main body includes a first main body and a second main body connected to each other, the first main body is used to be sealed with the sealing nail, and the second main body is used to be sealed with the sealing nail cover.

[0012] As an improvement of the sealing structure for the top cover of the utility model, in the height direction, the height H1 of the mounting groove and the height H2 of the first body satisfy the relationship: H1 / H2=a, a is a constant, 0.6≤a≤0.8.

[0013] As an improvement of the sealing structure for the top cover of the utility model, in the height direction, the height H3 of the first mounting hole and the height H4 of the sealing nail cover satisfy the relationship: H3 / H4=b, b is a constant, 0.2≤b≤0.5. The height of the mounting groove and the height of the first mounting hole can ensure the physical properties of the main body and the sealing nail cover while meeting the assembly requirements.

[0014] As an improvement of the sealing structure for the top cover described in the utility model, there are multiple limit members, and the multiple limit members are arranged along the circumference of the sealing nail. The number of the first mounting holes, the number of the second mounting holes and the number of the mounting grooves are all the same as the number of the limit members, further ensuring that the limit members can prevent the sealing nail from rotating.

[0015] As an improvement of the sealing structure for the top cover described in the utility model, the sealing nail cover has a transverse surface perpendicular to the height direction, a first sealing groove is arranged on the transverse surface, and a second sealing groove is arranged on the first main body in contact with the transverse surface, the first sealing groove and the second sealing groove cooperate with each other to form a closed space, the sealing member is installed in the closed space, the structures of the first sealing groove and the second sealing groove match and the sizes are the same, so as to ensure the sealing of the closed space.

[0016] As an improvement of the sealing structure for the top cover described in the utility model, the first sealing groove and the second sealing groove are configured as a continuous structure arranged around the sealing pin, further ensuring the sealing performance of the enclosed space and the sealing member.

[0017] The second purpose of the utility model is to provide a battery top cover, including a cover plate and the sealing structure for the top cover as described above, which is arranged on the cover plate.

[0018] The third object of the present utility model is to provide a battery, comprising the battery top cover as described above.

[0019] A fourth object of the present utility model is to provide an electrical device comprising the battery as described above.

[0020] The beneficial effect of the utility model is that the sealing structure for the top cover of the utility model includes a main body and a liquid injection hole sealed by a sealing nail, the sealing nail includes a sealing nail cover and a sealing glue nail, and also includes a sealing member and a limiting member, the sealing member is arranged between the sealing nail cover and the main body in contact with it, the limiting member passes through the first mounting hole and the second mounting hole and is fixedly installed in the mounting groove, and the sealing glue nail and the inner wall of the liquid injection hole in contact with it are both provided with mutually matching threaded structures. The utility model prevents the rotation of the sealing glue nail through the limiting member and the threaded structure, thereby increasing the sealing effect of the sealing glue nail and the liquid injection hole, and at the same time, the double sealing effect is achieved by setting the sealing member, thereby increasing the reliability of the sealing structure and reducing the risk of electrolyte overflowing from the liquid injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0022] Figure 1 It is a cross-sectional schematic diagram of the utility model.

[0023] Figure 2 It is a cross-sectional schematic diagram of the main body in the utility model.

[0024] Figure 3 It is a cross-sectional schematic diagram of the sealing nail cover in the utility model.

[0025] The reference numerals are described as follows:

[0026] 1-main body; 11-first main body; 111-installation groove; 112-second sealing groove; 12-second main body;

[0027] 2- injection hole;

[0028] 3-sealing nail; 31-sealing nail cover; 311-first mounting hole; 312-transverse surface; 313-first sealing groove; 32-sealing glue nail;

[0029] 4- Seals;

[0030] 5-Limiting parts;

[0031] Z-height direction. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0034] Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0037] The term "plurality" used in the present application refers to two or more (including two).

[0038] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety must also be considered.

[0039] During the manufacturing process of the battery, the sealing pins need to be welded after two injections, and the sealing pins used for the first injection seal will be pulled out during the second injection and then installed. The sealing pin cover after the second injection will seal the injection hole. The inventor found that in the above process, the sealing pin is easy to rotate, and gaps are easy to appear during the welding process of the sealing pin cover, resulting in a decrease in the sealing performance of the sealing pin and electrolyte overflow, which in turn causes a decrease in battery performance.

[0040] In view of this, the embodiment of the present application provides a technical solution, which enhances the reliability of the sealing structure by setting a seal, a limiter and a threaded structure, thereby enhancing the connection sealing performance of the injection hole and the sealing pin to avoid overflow of the electrolyte.

[0041] The following is combined with Figures 1 to 3 The utility model is further described in detail with specific implementation modes, but it is not intended to limit the utility model. Figure 2 The dotted line in the figure is used to distinguish the first body 11 from the second body 12, but is not provided in the actual structure.

[0042] A sealing structure for a top cover comprises a main body 1 and a liquid injection hole 2 arranged on the main body 1, the liquid injection hole 2 is sealed by a sealing nail 3, the sealing nail 3 comprises a sealing nail cover 31 and a sealing glue nail 32 in sequence in the height direction Z of the sealing structure, the sealing nail cover 31 is located above the sealing glue nail 32, and the sealing glue nail 32 is at least partially exposed to the liquid injection hole 2 in a direction away from the sealing nail cover 31, thereby enhancing the connection strength between the sealing glue nail 32 and the liquid injection hole 2 and reducing the difficulty of assembly; the main body 1 comprises a first main body 11 and a second main body 12 which are interconnected or integrally formed, the first main body 11 is used to be sealed and connected to the sealing glue nail 32, and the second main body 12 is used to be sealed and connected to the sealing nail cover 31.

[0043] Specifically, the sealing glue nail 32 and the inner wall of the injection hole 2 in contact therewith are both provided with mutually matching thread structures, and the thread structure can increase the connection strength between the sealing glue nail 32 and the injection hole 2.

[0044] Specifically, the sealing structure also includes a limit member 5, the sealing nail cover 31 is provided with a first mounting hole 311, the sealing nail 32 is provided with a second mounting hole matching the first mounting hole 311, the second mounting hole is a through hole, and the main body 1 is provided with a mounting groove 111 corresponding to the second mounting hole. The limit member 5 passes through the first mounting hole 311 and the second mounting hole and is fixedly installed in the mounting groove 111. The limit member 5 is used for positioning the sealing nail 32 to prevent the sealing nail 32 from rotating. In the present embodiment, the limit member 5 is set as a limit pin. It can be understood that in some other embodiments, the selection of the limit member 5 can be replaced according to actual conditions without making specific settings.

[0045] Preferably, in the height direction Z, the height H1 of the mounting groove 111 and the height H2 of the first main body 11 satisfy the relationship: H1 / H2=a, a is a constant, 0.6≤a≤0.8; the height H3 of the first mounting hole 311 and the height H4 of the sealing nail cover 31 satisfy the relationship: H3 / H4=b, b is a constant, 0.2≤b≤0.5. The setting of the height of the mounting groove 111 and the first mounting hole 311 ensures the physical properties of the sealing structure while meeting the assembly requirements.

[0046] Preferably, a plurality of limit members 5 are provided, and the plurality of limit members 5 are arranged along the circumference of the sealing nail 3. The number of the first mounting holes 311, the number of the second mounting holes and the number of the mounting grooves 111 are all the same as the number of the limit members 5, further ensuring that the limit members 5 can prevent the sealing nail 32 from rotating.

[0047] Specifically, the sealing nail cover 31 has a transverse surface 312 perpendicular to the height direction Z, and a first sealing groove 313 is provided on the transverse surface 312. The first main body 11 in contact with the transverse surface 312 is provided with a second sealing groove 112. The first sealing groove 313 and the second sealing groove 112 cooperate with each other to form a closed space. The sealing member 4 is installed in the closed space. In this embodiment, the sealing nail cover 31 and the sealing member 4 form a double seal for the injection hole 2. First, the sealing nail cover 31 can prevent the sealing nail 32 from popping out and shifting; secondly, when the sealing nail 32 is When cracks appear at the welding point of the nail cover 31 due to stress, the seal 4 can still seal the injection hole 2, prevent leakage, and increase the stability and safety of the sealing structure; the position of the enclosed space is at a certain distance from the welding position of the sealing nail cover 31 and is not located in the same plane. The distance is set according to the depth of the injection hole 2, which can avoid the welding stress from acting on the enclosed space when the sealing nail cover 31 is welded, causing cracks in the enclosed space, thereby further ensuring the airtightness of the sealing structure.

[0048] In some other embodiments, the first sealing groove 313 can be set on the side of the sealing nail cover 31, and the second sealing groove 112 is correspondingly set on the side wall of the first body 11, which can also achieve a double sealing effect but increase the difficulty of assembly.

[0049] Preferably, the first sealing groove 313 and the second sealing groove 112 are configured as a continuous structure disposed around the sealing pin 3 and the two have the same size. The configuration of the continuous structure can ensure the sealing of the enclosed space formed by the two.

[0050] Preferably, the structure of the first sealing groove 313 and the second sealing groove 112 is one of an annular groove, a square groove and a rectangular groove; the seal 4 is one of a circular sealing ring, an elliptical sealing ring, an annular gasket-shaped sealing ring, a square sealing ring, a rectangular sealing ring and a sealing gasket; it can be understood that the seal 4 and the enclosed space can also choose other shapes, as long as they are continuous and match each other, and can be adjusted according to actual conditions without making specific settings.

[0051] Battery cover

[0052] A battery top cover comprises a cover plate and a sealing structure for the top cover as described above arranged on the cover plate, wherein a main body 1 in the sealing structure is a part of the cover plate. It can be understood that, according to actual needs and structural requirements of the battery, structures such as explosion-proof valves and poles can also be arranged on the cover plate.

[0053] Battery

[0054] A battery comprises the battery top cover as described above, and the battery may be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc.

[0055] Electrical devices

[0056] An electrical device, including a battery as described above, can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0057] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A sealing structure for a top cover, comprising a main body (1) and a liquid injection hole (2) arranged on the main body (1), wherein the liquid injection hole (2) is sealed by a sealing pin (3), wherein the sealing pin (3) comprises a sealing pin cover (31) and a sealing glue pin (32) in sequence in a height direction (Z) of the sealing structure, wherein the sealing pin cover (31) is located above the sealing glue pin (32), and the sealing pin cover (31) is used for welding with the main body (1), characterized in that: Also includes: A sealing member (4), wherein the sealing member (4) is arranged between the sealing nail cover (31) and the main body (1) in contact with the sealing nail cover (31); The limiting member (5) is provided with a first mounting hole (311) on the sealing nail cover (31), the sealing glue nail (32) is provided with a second mounting hole matching the first mounting hole (311), the main body (1) is provided with a mounting groove (111) corresponding to the second mounting hole, and the limiting member (5) passes through the first mounting hole (311) and the second mounting hole and is fixedly installed in the mounting groove (111); The sealing glue nail (32) and the inner wall of the liquid injection hole (2) in contact therewith are both provided with mutually matching thread structures.

2. The sealing structure for a top cover according to claim 1, characterized in that: The main body (1) comprises a first main body (11) and a second main body (12) which are connected to each other, wherein the first main body (11) is used for being sealedly connected to the sealing nail (32), and the second main body (12) is used for being sealedly connected to the sealing nail cover (31).

3. The sealing structure for the top cover according to claim 2, characterized in that: In the height direction (Z), the height H1 of the mounting groove (111) and the height H2 of the first body (11) satisfy the relationship: H1 / H2=a, where a is a constant, 0.6≤a≤0.

8.

4. The sealing structure for a top cover according to claim 2, characterized in that: In the height direction (Z), the height H3 of the first mounting hole (311) and the height H4 of the sealing nail cover (31) satisfy the relationship: H3 / H4=b, b is a constant, 0.2≤b≤0.

5.

5. The sealing structure for a top cover according to claim 1, characterized in that: A plurality of the limiting members (5) are provided, and the plurality of limiting members (5) are arranged along the circumference of the sealing pin (3), and the number of the first mounting holes (311), the number of the second mounting holes and the number of the mounting grooves (111) are all the same as the number of the limiting members (5).

6. The sealing structure for a top cover according to claim 2, characterized in that: The sealing nail cover (31) has a transverse surface (312) perpendicular to the height direction (Z), and a first sealing groove (313) is provided on the transverse surface (312). The first main body (11) in contact with the transverse surface (312) is provided with a second sealing groove (112), and the first sealing groove (313) and the second sealing groove (112) cooperate with each other to form a closed space, and the sealing member (4) is installed in the closed space.

7. The sealing structure for a top cover according to claim 6, characterized in that: The first sealing groove (313) and the second sealing groove (112) are configured as a continuous structure arranged around the sealing pin (3).

8. A battery top cover, characterized in that: The invention comprises a cover plate and a sealing structure for a top cover as claimed in any one of claims 1 to 7 arranged on the cover plate.

9. A battery, characterized in that: Comprising the battery top cover as claimed in claim 8.

10. An electrical device, characterized in that: Comprising the battery as claimed in claim 9.

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