A cap for sealing a large cylindrical battery

Abstract

This utility model discloses a cap for sealing large cylindrical batteries, including a cap body and a rotating jaw. The cap body includes a connecting stud, a sealing cap, sealing auxiliary blades, and a sealing boss. The connecting stud is located at the center of the top of the sealing cap and is threadedly connected to the cap plate. The bottom of the sealing cap has a sealing boss, and several sealing auxiliary blades are spaced circumferentially on the bottom of the sealing cap outside the sealing boss. The sealing boss is sealed to the battery port of the cylindrical battery to separate the electrolyte from the air. The rotating jaw includes a rotating base and a rotating handle. The rotating base includes a rotating base and a rotating column disposed on the rotating base. The rotating base has grooves that cooperate with the sealing auxiliary blades, and the number of sealing auxiliary blades corresponds one-to-one with the number of grooves. A through hole is formed radially on the rotating column, and the rotating handle is inserted into the through hole. Rotating the rotating handle is used to install the sealing cap into the cap plate.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery technology, specifically relating to a cap for sealing large cylindrical batteries. Background Technology

[0002] In the lithium battery manufacturing process, insufficient air cleanliness is a significant factor affecting battery quality. It can introduce impurities into the electrolyte of open-cell batteries, leading to a series of problems, with the longer the exposure time, the greater the impact. Air containing impurities can contaminate the electrolyte, especially after high-temperature immersion for ten to twenty hours. This highlights the crucial importance of sealing the battery opening for improving battery quality.

[0003] Currently, a series of processes, including initial electrolyte injection, welding sealing, high-temperature settling, and formation, are generally used to seal the battery port. However, after the initial electrolyte injection, a small number of air bubbles usually remain inside the battery electrolyte. If the old process is used to directly weld and seal the battery port, the presence of these air bubbles will significantly reduce the battery's quality.

[0004] Therefore, there is an urgent need to design a sealing device that can greatly improve battery quality. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a cap for sealing large cylindrical batteries. This invention is fixed to a matching cap tray assembly, featuring a simple structure and convenient installation.

[0006] The technical solution adopted in this utility model is:

[0007] A cap for sealing large cylindrical batteries, characterized in that it comprises a matching cap body and a rotating gripper (7), wherein:

[0008] The cap body includes a connecting stud (1), a sealing cap (2), sealing auxiliary blades (3), and a sealing boss (4). The sealing cap (2) has a connecting stud (1) at the top center, and the connecting stud (1) is threadedly connected to the cap plate (5). The sealing cap (2) has a sealing boss (4) at the bottom end, and several sealing auxiliary blades (3) are spaced along the circumferential direction on the bottom end of the sealing cap outside the sealing boss (4). The sealing boss (4) is sealed to the battery port of the cylindrical battery (6) to separate the electrolyte from the air.

[0009] The rotating jaw (7) includes a rotating base (71) and a rotating handle (72). The rotating base (72) includes a rotating base (711) and a rotating column (712) disposed on the rotating base (711). The rotating base (711) has a groove for use with the sealing auxiliary blade (3). The number of sealing auxiliary blades (3) corresponds one-to-one with the number of grooves. A through hole is opened radially on the rotating column (712). The rotating handle (3) is inserted into the through hole. Rotating the rotating handle is used to install the sealing cover into the cap plate. The sealing cover and the cap plate are interference-fitted.

[0010] Furthermore, the upper part of the outer side of the sealing boss (4) has a boss sealing surface (41), and the lower part has a boss guide surface (42). The guide surface is an inclined surface, and the battery port of the cylindrical battery has a stepped surface that matches the inclined surface.

[0011] Furthermore, the cap plate (5) has a countersunk hole for installing the sealing cap (2). The upper part of the end face of the outer side of the sealing cap that extends into the countersunk hole is an inclined surface. The inner diameter D7 of the countersunk hole is greater than or equal to the outer diameter D6 of the inclined surfaces on both sides of the sealing cap, so as to achieve an interference fit between the sealing cap and the cap plate.

[0012] Furthermore, the outer diameter D4 of the sealing boss (4) is larger than the inner diameter D5 of the battery port, so as to achieve an interference fit between the sealing boss (4) and the battery port.

[0013] Furthermore, both the sealing cover (2) and the sealing auxiliary blade (3) are made of steel plate, and the outer layer of the steel plate and the sealing boss (4) of the sealing cover (2) and the sealing auxiliary blade (3) are integrally injection molded from EPDM rubber.

[0014] The technical concept of this utility model is as follows: This utility model changes the original method of directly welding the battery opening to a detachable cap sealing device. The process is carried out in the following steps: primary liquid injection, battery capping, high-temperature standing, battery cap removal, negative pressure formation, and secondary liquid injection. After the primary liquid injection, the battery containing a small amount of air can be injected again, thereby reducing the generation of air bubbles and greatly improving the quality of the battery.

[0015] Compared with the prior art, the beneficial effects of this utility model are reflected in:

[0016] 1. This utility model has a simple structure. It is fixed on the cap plate to seal the incoming battery to protect the electrolyte, thereby ensuring the battery production quality and greatly improving the battery qualification rate.

[0017] 2. This utility model isolates the battery electrolyte from the air, reducing the impact of air impurities on the electrolyte.

[0018] 3. This utility model follows the process of primary electrolyte injection, battery capping, high-temperature settling, battery cap removal, negative pressure formation, and secondary electrolyte injection. The original method of directly welding the battery opening is replaced with a detachable cap sealing device. Batteries containing a small amount of air after primary electrolyte injection can be injected a second time, thereby reducing the generation of air bubbles and greatly improving the quality of the battery. Attached Figure Description

[0019] Figure 1a This is a schematic diagram of the three-dimensional structure of the sealing cap of this utility model.

[0020] Figure 1b This is a three-dimensional structural diagram of the sealing cap of this utility model. Figure 2 .

[0021] Figure 2 This is a cross-sectional view of the sealing cap of this utility model in the pressed state of the cap plate and the battery tray.

[0022] Figure 3a This is a schematic diagram of the rotating gripper structure of this utility model.

[0023] Figure 3b This is a schematic diagram of the installation of the rotating gripper of this utility model.

[0024] Figure 4 This is a utility model Figure 2 Enlarged view of a portion of the image (I).

[0025] Figure 5 This is a schematic diagram showing the dimensions of the sealing disc during pressing.

[0026] Wherein, D1 - height of the beveled surface of the sealing cap, D2 - height of the guide surface of the sealing boss, D3 - outer diameter of the guide surface of the sealing boss, D4 - outer diameter of the sealing boss, D5 - inner diameter of the battery opening of the cylindrical battery, D6 - outer diameter of the beveled surface of the sealing cap, and D7 - inner diameter of the countersunk hole of the cap plate. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0030] refer to Figures 1a to 5This utility model discloses a cap for sealing large cylindrical batteries, comprising a matching cap body and a rotating gripper 7, wherein:

[0031] The cap body includes a connecting stud 1, a sealing cap 2, sealing auxiliary blades 3, and a sealing boss 4. The sealing cap 2 has a connecting stud 1 at the center of its top, and the connecting stud 1 is threadedly connected to the cap disc 5. The sealing cap 2 has a sealing boss 4 at its bottom end, and several sealing auxiliary blades 3 are spaced apart along the circumferential direction on the bottom end of the sealing cap outside the sealing boss 4. The sealing boss 4 is sealed to the battery port of the cylindrical battery 6 to separate the electrolyte from the air.

[0032] The rotating gripper 7 includes a rotating base 71 and a rotating handle 72. The rotating base 71 includes a rotating base 711 and a rotating column 712 disposed on the rotating base 711. The rotating base 711 has a groove for cooperating with the sealing auxiliary blades 3. The number of sealing auxiliary blades 3 corresponds one-to-one with the number of grooves. A through hole is opened radially on the rotating column 712. The rotating handle 3 is inserted into the through hole. Rotating the rotating handle is used to install the sealing cover into the cap plate. The sealing cover and the cap plate are interference-fitted.

[0033] In one embodiment, the upper part of the outer side of the sealing boss 4 has a boss sealing surface 41, and the lower part has a boss guide surface 42. The guide surface is an inclined surface, and the battery port of the cylindrical battery has a stepped surface that cooperates with the inclined surface.

[0034] In one embodiment, the cap plate 5 has a countersunk hole for installing the sealing cap 2. The upper part of the end face of the outer side of the sealing cap that extends into the countersunk hole is an inclined surface. The inner diameter D7 of the countersunk hole is greater than or equal to the outer diameter D6 of the inclined surfaces on both sides of the sealing cap, so as to achieve an interference fit between the sealing cap and the cap plate.

[0035] In one embodiment, the outer diameter D4 of the sealing boss 4 is larger than the inner diameter D5 of the battery port, so as to achieve an interference fit between the sealing boss 4 and the battery port.

[0036] In one embodiment, both the sealing cover 2 and the sealing auxiliary blade 3 are made of steel plate, and the outer layer of the steel plate of the sealing cover 2 and the sealing auxiliary blade 3, as well as the sealing boss 4, are integrally injection molded from EPDM rubber.

[0037] This invention replaces the original method of directly welding the battery opening with a detachable cap sealing device. The process involves primary electrolyte injection, battery capping, high-temperature settling, battery cap removal, negative pressure formation, and secondary electrolyte injection. Batteries containing a small amount of air after the primary electrolyte injection can undergo a secondary electrolyte injection, thereby reducing the generation of air bubbles and greatly improving battery quality.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cap for sealing large cylindrical batteries, characterized in that, Includes a matching cap body and a rotating gripper (7), wherein: The cap body includes a connecting stud (1), a sealing cap (2), sealing auxiliary blades (3), and a sealing boss (4). The sealing cap (2) has a connecting stud (1) at the top center, and the connecting stud (1) is threadedly connected to the cap plate (5). The sealing cap (2) has a sealing boss (4) at the bottom end, and several sealing auxiliary blades (3) are spaced along the circumferential direction on the bottom end of the sealing cap outside the sealing boss (4). The sealing boss (4) is sealed to the battery port of the cylindrical battery (6) to separate the electrolyte from the air. The rotating jaw (7) includes a rotating seat (71) and a rotating handle (72). The rotating seat (71) includes a rotating base (711) and a rotating column (712) disposed on the rotating base (711). The rotating base (711) has a groove for use with the sealing auxiliary blade (3). The number of sealing auxiliary blades (3) corresponds one-to-one with the number of grooves. A through hole is opened radially on the rotating column (712). The rotating handle (72) is inserted into the through hole. Rotating the rotating handle is used to install the sealing cover into the cap plate. The sealing cover and the cap plate are interference-fitted.

2. A cap for sealing large cylindrical batteries as described in claim 1, characterized in that, The upper part of the outer side of the sealing boss (4) has a boss sealing surface (41), and the lower part has a boss guide surface (42). The guide surface is an inclined surface, and the battery port of the cylindrical battery has a stepped surface that matches the inclined surface.

3. A cap for sealing large cylindrical batteries as described in claim 1, characterized in that, The cap plate (5) has a countersunk hole for installing the sealing cap (2). The upper part of the end face of the outer side of the sealing cap that extends into the countersunk hole is an inclined surface. The inner diameter D7 of the countersunk hole is greater than or equal to the outer diameter D6 of the inclined surfaces on both sides of the sealing cap, so as to achieve an interference fit between the sealing cap and the cap plate.

4. A cap for sealing large cylindrical batteries as described in claim 1, characterized in that, The outer diameter D4 of the sealing boss (4) is larger than the inner diameter D5 of the battery port, so as to achieve an interference fit between the sealing boss (4) and the battery port.

5. A cap for sealing large cylindrical batteries as described in claim 1, characterized in that, Both the sealing cover (2) and the sealing auxiliary blade (3) are made of steel plate, and the outer layer of the steel plate and the sealing boss (4) of the sealing cover (2) and the sealing auxiliary blade (3) are integrally injection molded from EPDM rubber.

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