Battery liquid injection hole structure and sealing method

Abstract

The invention discloses a battery liquid injection hole structure and a sealing method, and belongs to the technical field of batteries, the battery liquid injection hole structure comprises a top cover piece, the top cover piece comprises a cover body and a concave area arranged on the cover body, the cover body is provided with a liquid injection hole and a limiting groove, a sealing ring matched with the limiting groove, and a sealing nail, the liquid injection hole and the limiting groove are located in the concave area, the limiting groove is arranged around the liquid injection hole, and the liquid injection hole penetrates through the top cover piece. The sealing ring is embedded into the limiting groove, and at least part of the sealing ring is located outside the limiting groove; the sealing nail covers the concave area, the sealing nail is connected with the cover body, and the concave area is enclosed by the sealing nail and the cover body. The technical effects that the liquid injection efficiency is improved, and the safety and the sealing performance are improved are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a battery liquid injection hole structure and a sealing method. Background Art

[0002] Battery products are widely used in multiple fields such as electric vehicles, household energy storage, and portable batteries. As an important component of the battery, the electrolyte is crucial for the performance of the battery. In the manufacturing process of lithium-ion batteries, electrolyte injection is a key process that determines the battery performance. In the prior art, a circular liquid injection hole is usually opened on the battery top cover, and the electrolyte is injected into the battery through this circular liquid injection hole. After the injection is completed, a sealing rubber plug and a welding aluminum nail are inserted at the liquid injection hole to achieve the sealing of the battery. However, the small diameter of the liquid injection hole will limit the injection speed, resulting in low injection efficiency. During the injection process, the battery is also prone to overflow. After the electrolyte remains on the outer surface of the battery top cover, it will not only corrode the top cover but also pose a risk of short circuit. At the same time, the position where the sealing aluminum nail is welded to the liquid injection hole is small, making the sealing aluminum nail vulnerable to heat during welding and resulting in poor welding and poor sealing. During the later use of the battery, the sealing rubber plug is also likely to fall into the battery interior due to vibrations or other reasons, damaging the internal structure of the battery and having low sealing safety.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Invention

[0004] The technical problems to be solved by the present invention are the technical problems of low injection efficiency, poor safety, and poor sealing.

[0005] To solve the above technical problems, the present invention provides a battery liquid injection hole structure. The battery liquid injection hole structure includes a top cover sheet. The top cover sheet includes a cover body and a recessed area provided on the cover body. A liquid injection hole and a limiting groove are respectively provided on the cover body, a sealing ring matching the limiting groove, and a sealing nail. The liquid injection hole and the limiting groove are respectively located in the recessed area. The limiting groove is arranged around the liquid injection hole. The liquid injection hole penetrates through the top cover sheet. The sealing ring is embedded in the limiting groove, and at least part of the sealing ring is located outside the limiting groove. The sealing nail covers the recessed area, and the sealing nail is connected to the cover body. The sealing nail and the cover body enclose the recessed area.

[0006] Optionally, the cover body includes a first side surface and a second side surface. The recessed area is formed by recessing from the first side surface towards the second side surface. The liquid injection hole penetrates through the first side surface and the second side surface respectively. The limiting groove is located on the first side surface.

[0007] Optionally, the recessed area includes a bottom wall and side walls connected to the bottom wall, and the liquid injection holes penetrate through the bottom wall and the second side surface respectively.

[0008] Optionally, the battery liquid injection hole structure further includes a first rib and a second rib respectively disposed on the bottom wall, the limiting groove is located between the first rib and the second rib, and the sealing ring is connected to the first rib and the second rib respectively.

[0009] Optionally, when observed in a first direction, the projection of the sealing ring on the side wall in the first direction is located on the side wall, the projections of the first rib and the second rib on the side wall in the first direction are respectively located on the side wall, and the projections of the first rib and the second rib on the sealing ring in the first direction are respectively located on the sealing ring. The first direction is a direction parallel to the first side surface.

[0010] Optionally, the first rib is arranged at an interval from the side wall, and the first rib, the side wall and the bottom wall enclose a stepped groove; the edge of the sealing nail is embedded in the stepped groove.

[0011] Optionally, a plurality of ribs are provided on the cover body, the plurality of ribs are arranged at intervals, a limiting groove is formed between two adjacent ribs, the sealing ring is connected to two adjacent ribs respectively, and the limiting groove is annular or rectangular.

[0012] Optionally, the battery liquid injection hole structure further includes a lower plastic with a through hole, the lower plastic is connected to the cover body, the through hole is opposite to the liquid injection hole; a positive upper plastic, a negative upper plastic and an explosion-proof valve respectively provided on the cover body, and a protection patch provided on the explosion-proof valve; a positive electrode column respectively penetrating through the lower plastic and the cover body, and a first sealing member is sleeved on the positive electrode column; a negative electrode column respectively penetrating through the lower plastic and the cover body, and a second sealing member is sleeved on the negative electrode column.

[0013] According to another aspect of the present invention, the present invention further provides a battery liquid injection hole sealing method applied to the battery liquid injection hole structure. The battery liquid injection hole sealing method includes respectively machining the recessed area, the liquid injection hole, the first rib and the second rib on the cover body of the top cover sheet, and the limiting groove is formed between the first rib and the second rib; embedding the sealing ring into the limiting groove, and pressing the sealing ring by a liquid injection nozzle to inject liquid through the liquid injection hole; after the liquid injection is completed, installing the sealing nail into the recessed area, laser welding and sealing the sealing nail and the cover body, and pressing the sealing ring by the sealing nail.

[0014] Optionally, the pressing of the sealing ring by the sealing nail includes pressing the sealing ring by the sealing nail so that the compression amount of the sealing ring is 20% to 50% of the original height of the sealing ring; machining the recessed area on the cover body of the top cover sheet includes machining a bottom wall and a side wall connected to the bottom wall on the cover body respectively, the bottom wall and the side wall enclose to form the recessed area, the liquid injection hole penetrates through the bottom wall, when observed in a direction perpendicular to the bottom wall, the side wall and the liquid injection hole are respectively circular, the diameter of the side wall is greater than or equal to 10 mm, and the diameter of the liquid injection hole is greater than or equal to 5 mm.

[0015] Beneficial effects:

[0016] The present invention provides a battery liquid injection hole structure. By respectively arranging a liquid injection hole and a limiting groove on the cover body of the top cover sheet, the liquid injection hole and the limiting groove are respectively located in the recessed area arranged on the cover body, the limiting groove is arranged around the liquid injection hole, the liquid injection hole penetrates through the top cover sheet, the sealing ring matches with the limiting groove, the sealing ring is embedded inside the limiting groove, and at least part of the sealing ring is located outside the limiting groove, the sealing nail covers the recessed area, the sealing nail is connected to the cover body, and the sealing nail and the cover body enclose the recessed area. In this way, a liquid injection hole is arranged on the cover body of the top cover sheet to supply electrolyte to be injected into the battery interior. The sealing ring is positioned by the limiting groove located on the cover body, and the overall structural strength of the recessed area is enhanced. When the battery is being filled with liquid, the sealing ring can block the overflow of the electrolyte, avoiding the corrosion of the top cover sheet by the electrolyte and causing a short circuit. The recessed area is covered by connecting the sealing nail to the cover body, and the sealing nail presses the sealing ring, realizing the fixation of the sealing ring and enhancing the sealing performance of the overall structure. Thus, the technical effects of improving the liquid injection efficiency, enhancing the safety and sealing performance are achieved. Description of the drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of a battery liquid injection hole structure provided by an embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a recessed area in a battery liquid injection hole structure provided by an embodiment of the present invention.

[0020] Figure 3 It is a schematic structural diagram of a lower plastic in a battery liquid injection hole structure provided by an embodiment of the present invention.

[0021] Figure 4Schematic diagram of the top cover sheet in a battery liquid injection hole structure provided by an embodiment of the present invention.

[0022] Figure 5 Schematic diagram of the liquid injection hole in a battery liquid injection hole structure provided by an embodiment of the present invention.

[0023] Figure 6 Schematic diagram of the sealing nail in a battery liquid injection hole structure provided by an embodiment of the present invention.

[0024] Figure 7 Flowchart of a battery liquid injection hole sealing method provided by an embodiment of the present invention. Detailed implementation manners

[0025] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The implementation manners described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0026] In order to enable those skilled in the art of the present technology to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a 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 creative efforts fall within the scope of protection of the present application.

[0027] In the embodiments of the present application, "at least one" means one or more; "a plurality" means two or more. In the description of the present application, words such as "first", "second", "third", etc. are only used for the purpose of distinguishing descriptions and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0028] The reference to "an implementation manner" or "some implementation manners" etc. in this specification means that a specific feature, structure, or characteristic described in combination with the embodiment is included in one or more implementation manners of the present application. Thus, the terms "including", "comprising", "having" and their variants in this specification all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0029] It should be noted that in the embodiments of the present invention, when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. At the same time, in the embodiments of the present application, "connection" can also be understood as electrical connection, and the connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are only for illustrative purposes and are not intended to limit the present invention.

[0030] An electrolyte injection hole structure provided in Embodiment 1 of the present invention is shown in Figures 1 to 6 as follows. Figure 1 FIG. is a schematic structural diagram of an electrolyte injection hole structure provided in an embodiment of the present invention. Figure 2 FIG. is a schematic structural diagram of a recessed area in an electrolyte injection hole structure provided in an embodiment of the present invention. Figure 3 FIG. is a schematic structural diagram of a lower plastic in an electrolyte injection hole structure provided in an embodiment of the present invention.

[0031] Figure 4 FIG. is a schematic structural diagram of a top cover sheet in an electrolyte injection hole structure provided in an embodiment of the present invention.

[0032] Figure 5 FIG. is a schematic structural diagram of an electrolyte injection hole in an electrolyte injection hole structure provided in an embodiment of the present invention. Figure 6 FIG. is a schematic structural diagram of a sealing nail in an electrolyte injection hole structure provided in an embodiment of the present invention. An electrolyte injection hole structure provided in an embodiment of the present invention includes a top cover sheet 1, an electrolyte injection hole 2, a limiting groove 3, a sealing ring 4 and a sealing nail 8. The top cover sheet 1 includes a cover body 11 and a recessed area 12. The recessed area 12 is provided on the cover body 11. An electrolyte injection hole 2 and a limiting groove 3 are respectively provided on the cover body 11. The sealing ring 4 is matched with the limiting groove 3. The electrolyte injection hole 2 and the limiting groove 3 are respectively located inside the recessed area 12. The limiting groove 3 is arranged around the electrolyte injection hole 2. The electrolyte injection hole 2 penetrates through the top cover sheet 1. The sealing ring 4 is embedded inside the limiting groove 3, and at least part of the sealing ring 4 is located outside the limiting groove 3. The sealing nail 8 covers the recessed area 12, and the sealing nail 8 is connected to the cover body 11. The sealing nail 8 and the cover body 11 enclose the recessed area 12.

[0033] Among them, the concave area 12 is formed by concave molding on the cover body 11. The inside of the concave area 12 has a space for accommodating the liquid injection hole 2, the limiting groove 3, the sealing ring 4, and the sealing nail 8. The liquid injection hole 2 forms a channel on the cover body 11 for the electrolyte to flow through. A part of the sealing ring 4 is embedded inside the limiting groove 3, and a part of the sealing ring 4 is limited by the limiting groove 3. Another part of the sealing ring 4 is located outside the limiting groove 3. The sealing ring 4 can be made of a material with high elasticity and corrosion resistance to electrolytes.

[0034] Among them, the sealing nail 8 can cover the concave area 12. The sealing nail 8 and the cover body 11 can be welded to each other. After the sealing nail 8 covers the concave area 12, a sealed space will be formed between the sealing nail 8 and the cover body 11 in the concave area 12. In addition, the sealing nail 8 can also be tightly combined with the cover body 11 by means of threaded connection.

[0035] In this embodiment, by respectively arranging the liquid injection hole 2 and the limiting groove 3 on the cover body 11 of the top cover sheet 1, the liquid injection hole 2 and the limiting groove 3 are respectively located in the concave area 12 arranged on the cover body 11. The limiting groove 3 is arranged around the liquid injection hole 2. The liquid injection hole 2 penetrates through the top cover sheet 1. The sealing ring 4 matches the limiting groove 3. The sealing ring 4 is embedded inside the limiting groove 3, and at least part of the sealing ring 4 is located outside the limiting groove 3. The sealing nail 8 covers the concave area 12, and the sealing nail 8 is connected to the cover body 11. The sealing nail 8 and the cover body 11 enclose the concave area 12. In this way, the liquid injection hole 2 is arranged on the cover body 11 of the top cover sheet 1 to supply the electrolyte to be injected into the battery interior. The sealing ring 4 is positioned by the limiting groove 3 located on the cover body 11, and the overall structural strength of the concave area 12 is enhanced. When the battery is being filled with liquid, the sealing ring 4 can block the overflow of the electrolyte, preventing the electrolyte from corroding the top cover sheet 1 and causing a short circuit. The concave area 12 is covered by connecting the sealing nail 8 to the cover body 11, and the sealing nail 8 presses the sealing ring 4 to fix the sealing ring 4 and enhance the sealing of the overall structure. Thus, the technical effects of improving the liquid injection efficiency, enhancing the safety and sealing performance are achieved.

[0036] As an implementation manner, the cover body 11 includes a first side surface 111 and a second side surface 112. The concave area 12 is formed by concave molding from the first side surface 111 towards the direction close to the second side surface 112. The liquid injection hole 2 penetrates through the first side surface 111 and the second side surface 112 respectively. The limiting groove 3 is located on the first side surface 111. The first side surface 111 and the second side surface 112 are two opposite side surfaces of the cover body 11. Through the liquid injection hole 2, the electrolyte can be injected from the first side surface 111 and then pass through the cover body 11 to reach the interior of the battery. The limiting groove 3 is located on the first side surface 111, enabling the sealing ring 4 to be stably installed on the cover body 11 to prevent displacement during the liquid injection process. It is beneficial to realize the effective injection of the electrolyte and prevent the overflow of the electrolyte.

[0037] In some embodiments, the recessed area 12 includes a bottom wall 121 and a side wall 122. The side wall 122 is connected to the bottom wall 121. The liquid injection holes 2 penetrate through the bottom wall 121 and the second side surface 112 respectively, so that the liquid injection holes 2 form openings at the bottom of the recessed area 12, which is beneficial to the uniform injection of the electrolyte. After the liquid injection holes 2 penetrate through the bottom wall 121 and the second side surface 112, the electrolyte can be directly injected to the bottom of the recessed area 12, reducing the flow distance of the electrolyte in the cover body 11. At the same time, the combination of the bottom wall 121 and the side wall 122 can enhance the structural strength of the recessed area 12 and prevent deformation or rupture caused by the electrolyte pressure.

[0038] In some embodiments, a battery liquid injection hole structure provided by an embodiment of the present invention further includes a first rib 6 and a second rib 61. The first rib 6 and the second rib 61 are respectively arranged on the bottom wall 121. The limiting groove 3 is located between the first rib 6 and the second rib 61. The sealing ring 4 is respectively connected to the first rib 6 and the second rib 61. The first rib 6 and the second rib 61 can enhance the structural strength of the bottom wall 121 and provide additional support points at the same time, so that the sealing ring 4 can be more stably installed on the cover body 11. The limiting groove 3 is located between the first rib 6 and the second rib 61, so that the sealing ring 4 can be accurately positioned at a predetermined position during installation.

[0039] In some embodiments, when observed along the first direction, the projection of the sealing ring 4 on the side wall 122 along the first direction is located on the side wall 122. The projection of the first rib 6 on the side wall 122 along the first direction is located on the side wall 122. The projection of the second rib 61 on the side wall 122 along the first direction is located on the side wall 122. And the projection of the first rib 6 on the sealing ring 4 along the first direction is located on the sealing ring 4. The projection of the second rib 61 on the sealing ring 4 along the first direction is located on the sealing ring 4. The first direction is the direction parallel to the first side surface 111, that is, the first direction is the direction of the section perpendicular to the first side surface 111 of the cover body 11. For example Figure 1 as the top view, the first direction can be the section in the side view direction, so that the sealing nail 8 can press the sealing ring 4 tightly.

[0040] In some embodiments, the first rib 6 and the side wall 122 are arranged at intervals. The first rib 6, the side wall 122 and the bottom wall 121 enclose a stepped groove 7. The edge 81 of the sealing nail 8 is embedded in the stepped groove 7. That is, the shape of the edge 81 of the sealing nail 8 matches the internal space of the stepped groove 7. The stepped groove 7 can provide an additional support point for the sealing nail 8, so that the sealing nail 8 can be more stably installed on the cover body 11. At the same time, when the edge 81 of the sealing nail 8 is embedded in the stepped groove 7, the connection strength between the sealing nail 8 and the cover body 11 will be enhanced, and the sealing performance will be improved.

[0041] In some embodiments, a battery liquid injection hole structure provided by an embodiment of the present invention further includes a plurality of ribs. The plurality of ribs are arranged on the cover body 11, and the plurality of ribs are spaced apart from each other. A limiting groove 3 is formed between two adjacent ribs. The sealing ring 4 is respectively connected to two adjacent ribs. The limiting groove 3 is annular or rectangular. The plurality of ribs can enhance the structural strength of the cover body 11 and provide a plurality of support points at the same time, so that the sealing ring 4 can be more stably installed in the limiting groove 3. When the battery liquid injection hole 2 structure is injecting liquid, the sealing ring 4 located in the limiting groove 3 can effectively block the overflow of the electrolyte, avoid the electrolyte from corroding the top cover piece 1 and causing a short circuit, and improve the safety and sealing performance of the battery.

[0042] In some embodiments, a battery liquid injection hole 2 structure provided by an embodiment of the present invention further includes a lower plastic 9, a positive upper plastic 91, a negative upper plastic 92, an explosion-proof valve 93, a protective patch 94, a positive electrode post 95, a first seal 96, a negative electrode post 97 and a second seal 98. The first seal 96 and the second seal 98 can respectively refer to the sealing ring 4. The lower plastic 9 has a through hole, and the lower plastic 9 is connected to the cover body 11. The through hole is aligned with the liquid injection hole 2. The positive upper plastic 91, the negative upper plastic 92 and the explosion-proof valve 93 are respectively arranged on the cover body 11. The protective patch 94 is arranged on the explosion-proof valve 93. The positive electrode post 95 respectively penetrates through the lower plastic 9 and the cover body 11. The first seal 96 is sleeved on the positive electrode post 95. The negative electrode post 97 respectively penetrates through the lower plastic 9 and the cover body 11. The second seal 98 is sleeved on the negative electrode post 97. The through hole of the lower plastic 9 can provide a channel for injecting the electrolyte, and at the same time, the connection between the lower plastic 9 and the cover body 11 enhances the stability of the overall structure. The positive upper plastic 91, the negative upper plastic 92 and the explosion-proof valve 93 enable the battery to operate normally and have safety performance. The protective patch 94 can provide additional protection for the explosion-proof valve 93 to prevent the explosion-proof valve 93 from being damaged due to external factors. The positive electrode post 95 and the negative electrode post 97 respectively penetrate through the lower plastic 9 and the cover body 11 to provide positive and negative connection points for the battery. At the same time, the first seal 96 and the second seal 98 can enhance the sealing performance of the battery and prevent the leakage of the electrolyte.

[0043] In order to describe in detail a battery liquid injection hole 2 sealing method provided by the present invention, the above-mentioned Embodiment 1 has described in detail a battery liquid injection hole 2 structure. Based on the same inventive concept, the present application also provides a battery liquid injection hole 2 sealing method, as shown in Embodiment 2 for details.

[0044] Please refer to Figure 7 , Figure 7 which is a flowchart of a battery liquid injection hole sealing method provided by an embodiment of the present invention. Embodiment 2 of the present invention provides a battery liquid injection hole sealing method, which is applied to the above-mentioned battery liquid injection hole structure. The battery liquid injection hole sealing method includes the following steps:

[0045] Step S100, process the depression area 12, the liquid injection hole 2, the first rib 6 and the second rib 61 on the cover body 11 of the top cover sheet 1 respectively. A limiting groove 3 is formed between the first rib 6 and the second rib 61;

[0046] Among them, processing the depression area 12 on the cover body 11 of the top cover sheet 1 includes processing a bottom wall 121 and a side wall 122 connected to the bottom wall 121 on the cover body 11 respectively. The bottom wall 121 and the side wall 122 enclose to form the depression area 12. The liquid injection hole 2 penetrates the bottom wall 121. When observing along the direction perpendicular to the bottom wall 121, the side wall 122 and the liquid injection hole 2 are respectively circular. The diameter of the side wall 122 is greater than or equal to 10 mm, and the diameter of the liquid injection hole 2 is greater than or equal to 5 mm.

[0047] Specifically, a bottom wall 121 and a side wall 122 connected to the bottom wall 121 are formed on the cover body 11. The bottom wall 121 and the side wall 122 enclose to form the depression area 12. The liquid injection hole 2 penetrates the bottom wall 121 so that the electrolyte can be smoothly injected into the battery interior. When observing along the direction perpendicular to the bottom wall 121, both the side wall 122 and the liquid injection hole 2 are designed to be circular, which is beneficial to the uniform injection of the electrolyte and reduces the risk of leakage. The diameter of the side wall 122 is set to be greater than or equal to 10 mm, so that the depression area 12 has sufficient structural strength to support the subsequent sealing operation. The diameter of the liquid injection hole 2 is set to be greater than or equal to 5 mm, so that the electrolyte can smoothly enter the battery interior through the liquid injection hole 2. At the same time, the limiting groove 3 formed between the first rib 6 and the second rib 61 is used to accurately position the sealing ring 4, so that the sealing ring 4 will not shift during the installation process, and also enhances the structural strength of the depression area 12, which is beneficial to resisting the pressure generated during the electrolyte injection.

[0048] Step S200, embed the sealing ring 4 into the limiting groove 3, and use a liquid injection nozzle to press the sealing ring 4 to inject liquid through the liquid injection hole 2;

[0049] Specifically, the sealing ring 4 matching the size of the limiting groove 3 can be first embedded into the inside of the limiting groove 3 so that the sealing ring 4 can be stably installed in the limiting groove 3. Then use a liquid injection nozzle to press the sealing ring 4 so that the sealing ring 4 can closely fit around the limiting groove 3 and the liquid injection hole 2 during the liquid injection process to prevent the leakage of the electrolyte. The liquid injection process precisely controls the injection volume and injection speed of the electrolyte through the liquid injection nozzle, so that the battery interior can be evenly and fully filled with the electrolyte. That is, the effective embedding and pressing of the sealing ring 4 can prevent the electrolyte from leaking during the injection process. At the same time, the precise control of the liquid injection nozzle is beneficial to improving the liquid injection efficiency and the uniformity of the electrolyte inside the battery.

[0050] Step S300: After the liquid injection is completed, install the sealing nail 8 into the recessed area 12, laser-weld and seal the sealing nail 8 and the cover body 11, and press the sealing ring 4 through the sealing nail 8.

[0051] Wherein, pressing the sealing ring 4 through the sealing nail 8 includes pressing the sealing ring 4 by the sealing nail 8 so that the compression amount of the sealing ring 4 is 20% to 50% of the original height of the sealing ring 4.

[0052] In some embodiments, after the above step S100, it may include dispensing glue into the limiting groove 3 to form a sealing body in the limiting groove 3, and pressing the sealing body through the liquid injection nozzle to perform liquid injection through the liquid injection hole 2; after the liquid injection is completed, the above step S300 may be executed.

[0053] Specifically, after the liquid injection is completed, install the sealing nail 8 into the recessed area 12, and laser-weld and seal the sealing nail 8 and the cover body 11. At the same time, press the sealing ring 4 through the sealing nail 8 to improve the stability and sealing performance of the sealing ring 4. During the process of pressing the sealing ring 4, control the pressing force of the sealing nail 8 so that the compression amount of the sealing ring 4 reaches 20% to 50% of its original height, which is beneficial to enabling the sealing ring 4 to maintain sufficient elasticity and sealing performance when under pressure. The original height of the sealing ring 4 refers to the height when it is not compressed, and the compression amount of the sealing ring 4 refers to the height reduced after the sealing ring 4 is compressed. That is, the overall sealing performance of the battery liquid injection hole 2 structure is improved through the installation and pressing of the sealing nail 8. High-strength and reliable sealing connection is achieved through laser welding to prevent the leakage of electrolyte. At the same time, the appropriate compression amount of the sealing ring 4 enables it to achieve high stability and sealing performance during long-term use.

[0054] The present invention provides a method for sealing a battery liquid injection hole. The concave area 12, the liquid injection hole 2, the first rib 6 and the second rib 61 are respectively machined on the cover body 11 of the top cover sheet 1. A limiting groove 3 is formed between the first rib 6 and the second rib 61. The sealing ring 4 is embedded in the limiting groove 3, and a liquid injection nozzle is used to press the sealing ring 4 to inject liquid through the liquid injection hole 2. After the liquid injection is completed, the sealing nail 8 is installed in the concave area 12, and the sealing nail 8 and the cover body 11 are laser welded and sealed, and the sealing nail 8 presses the sealing ring 4. In this way, the liquid injection hole 2 is provided on the cover body 11 of the top cover sheet 1 to supply the electrolyte to be injected into the battery interior. The sealing ring 4 is positioned by the limiting groove 3 located on the cover body 11, and the overall structural strength of the concave area 12 is enhanced. When the battery is being injected with liquid, the sealing ring 4 can prevent the overflow of the electrolyte, avoiding the corrosion of the top cover sheet 1 by the electrolyte and causing a short circuit. The concave area 12 is covered by connecting the sealing nail 8 with the cover body 11, and the sealing nail 8 presses the sealing ring 4, realizing the fixation of the sealing ring 4 and enhancing the sealing performance of the overall structure. Thus, the technical effects of improving the liquid injection efficiency, enhancing the safety and the sealing performance are achieved.

[0055] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A battery filling hole structure, characterized in that: The battery liquid filling hole structure includes a top cover sheet, which includes a cover body and a recessed area arranged on the cover body, and the cover body is respectively provided with a liquid filling hole and a limiting groove, a sealing ring matching the limiting groove, and a sealing nail, the liquid filling hole and the limiting groove are respectively located in the recessed area, the limiting groove is arranged around the liquid filling hole, and the liquid filling hole passes through the top cover sheet; the sealing ring is embedded in the limiting groove, and the sealing ring is at least partially located outside the limiting groove; the sealing nail covers the recessed area, and the sealing nail is connected to the cover body, and the sealing nail and the cover body enclose the recessed area.

2. The battery liquid injection hole structure according to claim 1, characterized in that: The cover body includes a first side surface and a second side surface, the recessed area is formed from the first side surface toward the second side surface, the injection hole passes through the first side surface and the second side surface respectively, and the limiting groove is located on the first side surface.

3. The battery liquid injection hole structure according to claim 2, characterized in that: The recessed area includes a bottom wall and a side wall connected to the bottom wall, and the injection holes penetrate the bottom wall and the second side surface respectively.

4. The battery liquid injection hole structure according to claim 3, characterized in that: The battery liquid filling hole structure further includes a first convex rib and a second convex rib respectively arranged on the bottom wall, the limiting groove is located between the first convex rib and the second convex rib, and the sealing ring is connected to the first convex rib and the second convex rib respectively.

5. The battery liquid injection hole structure according to claim 4, characterized in that: Observing along a first direction, a projection of the sealing ring on the side wall along the first direction is located on the side wall, projections of the first rib and the second rib on the side wall along the first direction are respectively located on the side wall, and projections of the first rib and the second rib on the sealing ring along the first direction are respectively located on the sealing ring, and the first direction is a direction parallel to the first side surface.

6. The battery liquid injection hole structure according to claim 4, characterized in that: The first convex rib is arranged at intervals from the side wall, and the first convex rib, the side wall and the bottom wall are surrounded to form a step groove; the edge of the sealing nail is embedded in the step groove.

7. The battery liquid injection hole structure according to claim 1, characterized in that: A plurality of convex ribs are arranged on the cover body, the plurality of convex ribs are arranged at intervals, a limiting groove is formed between two adjacent convex ribs, the sealing ring is respectively connected to two adjacent convex ribs, and the limiting groove is annular or rectangular.

8. The battery liquid injection hole structure according to claim 1, characterized in that: The battery injection hole structure also includes a lower plastic with a through hole, the lower plastic is connected to the cover body, and the through hole is opposite to the injection hole; a positive electrode upper plastic, a negative electrode upper plastic and an explosion-proof valve are respectively arranged on the cover body, and a protective patch is arranged on the explosion-proof valve; a positive electrode column that passes through the lower plastic and the cover body respectively, and a first sealing member is sleeved on the positive electrode column; a negative electrode column that passes through the lower plastic and the cover body respectively, and a second sealing member is sleeved on the negative electrode column.

9. A method for sealing a battery liquid injection hole, characterized in that: Applied to the battery liquid injection hole structure according to any one of claims 1 to 8, the battery liquid injection hole sealing method comprises The recessed area, the injection hole, the first convex rib and the second convex rib are processed on the cover body of the top cover sheet respectively, and the limiting groove is formed between the first convex rib and the second convex rib; The sealing ring is embedded in the limiting groove, and the sealing ring is pressed by a liquid injection nozzle to inject liquid through the liquid injection hole; After the liquid injection is completed, the sealing pin is installed in the recessed area, the sealing pin and the cover body are sealed by laser welding, and the sealing ring is pressed by the sealing pin.

10. The method for sealing a battery liquid filling hole according to claim 9, characterized in that: The method of pressing the sealing ring by the sealing pin includes pressing the sealing ring by the sealing pin so that the compression amount of the sealing ring is 20% to 50% of the original height of the sealing ring; processing the recessed area on the cover body of the top cover piece includes processing a bottom wall and a side wall connected to the bottom wall on the cover body, the bottom wall and the side wall enclose the recessed area, the injection hole passes through the bottom wall, and when observed in a direction perpendicular to the bottom wall, the side wall and the injection hole are respectively circular, the diameter of the side wall is greater than or equal to 10 mm, and the diameter of the injection hole is greater than or equal to 5 mm.

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