Assembling method of sealing structure of battery shell, cylindrical battery and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to an assembling method of a sealing structure of a battery shell, a cylindrical battery and electric equipment. In the step S1, the lower plastic part is mounted on the inner top wall of the shell, so that the first mounting hole and the second mounting hole are coaxially formed. In the step S2, the sealing ring is arranged on the periphery of the pole in a sleeving mode, the pole sequentially penetrates through the second mounting hole and the first mounting hole, and the sealing ring is located in the shell; in the step S3, the upper plastic part sleeves the periphery of the pole and abuts against the outer top surface of the shell. In the step S4, the pole is riveted, the two axial ends of the pole deform and form a sealing groove in the circumferential direction of the pole, so that the sealing groove and the shell clamp the upper plastic part and the sealing ring, and the lower plastic part surrounds the second inner edge of the second mounting hole and is clamped between the inner top wall of the shell and the pole. The upper plastic part and the sealing ring are clamped in the sealing groove of the pole by the shell, so that the sealing assembly of the pole and the shell is realized, and the sealing performance and the safety of the cylindrical battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to an assembling method of sealing structure of battery shell, cylindrical battery and electric equipment. BACKGROUND

[0002] In the production and use process of the battery, the upper plastic part and the lower plastic part are usually installed between the pole and the shell of the battery, and the sealing assembly of the shell and the pole is realized through the upper plastic part and the lower plastic part. In the existing battery, the sealing between the pole and the shell is not strict, which may cause the shell to absorb the moisture in the air, resulting in the evaporation and drying of the electrolyte in the shell to form crystals, thereby increasing the internal resistance of the battery, reducing the performance and cycle life of the battery, affecting the performance of various parameters of the battery, and ultimately causing the battery to be unable to continue to be used, and even causing safety accidents such as short circuit of the battery. SUMMARY

[0003] The purpose of the present application is to provide an assembling method of sealing structure of battery shell, cylindrical battery and electric equipment, so as to improve the sealing performance between the pole and the shell and the safety of the cylindrical battery.

[0004] To achieve this purpose, the technical scheme adopted by the present application is:

[0005] The assembling method of the sealing structure of the battery shell, the sealing structure of the battery shell comprising a shell, a pole, an upper plastic part, a sealing ring and a lower plastic part, the shell being provided with a first mounting hole at one end in the axial direction, the lower plastic part being provided with a second mounting hole, the assembling method of the sealing structure of the battery shell comprising the following steps:

[0006] S1: the lower plastic part is installed on the inner top wall of the shell, so that the first mounting hole and the second mounting hole are coaxially arranged;

[0007] S2: the sealing ring is sleeved on the outer periphery of the pole, the pole passes through the second mounting hole and the first mounting hole in sequence, and the sealing ring is located inside the shell;

[0008] S3: the upper plastic part is sleeved on the outer periphery of the pole and abuts against the outer top surface of the shell;

[0009] S4: the pole is riveted and pressed, the both ends of the pole in the axial direction are deformed and a sealing groove is formed in the circumferential direction of the pole, so that the sealing groove and the shell clamp the upper plastic part and the sealing ring, and the lower plastic part is clamped between the inner top wall of the shell and the pole around the second inner edge of the second mounting hole.

[0010] As an optional solution, the upper plastic part comprises a plastic main body and a positioning column protruding from the plastic main body, and the outer top surface of the shell is provided with a positioning groove.

[0011] In step S3, the plastic body is sleeved on the outer periphery of the pole and abuts against the outer top surface of the housing, and the positioning post is inserted into the corresponding positioning groove.

[0012] As an alternative, in step S4, before riveting the pole post, the sealing ring is pre-compressed by squeezing the housing to reduce the thickness of the sealing ring.

[0013] As an optional solution, before step S1, the electrode post is prepared and an injection hole is opened in the electrode post.

[0014] As an optional solution, the sealing structure of the battery casing further includes a bottom cover, which is welded to the other end of the casing along its axial direction; after step S4, the following step is also included:

[0015] S5: After the battery cell is installed inside the housing, the bottom cover is sealed and welded to the other end of the housing along the axial direction.

[0016] As an optional solution, the sealing structure of the battery casing further includes a cap, and the electrode post, after being riveted, forms a welding groove at its top that communicates with the liquid injection hole; after step S5, the following step is also included:

[0017] S6: After adding electrolyte into the housing through the injection hole, the cap is sealed and welded into the welding groove.

[0018] As an optional solution, the sealing structure of the battery casing also includes adhesive pins; in step S6, before welding the cap, the adhesive pins are inserted into the injection hole.

[0019] As an optional solution, in step S6, the cap is pressed into the welding groove so that the top of the cap after welding is coplanar with the top of the pole post, and the cap presses against the adhesive nail.

[0020] A cylindrical battery includes a casing, terminals, an upper plastic component, a sealing ring, and a lower plastic component. The casing, terminals, upper plastic component, sealing ring, and lower plastic component are assembled using the aforementioned assembly method for the sealing structure of the battery casing.

[0021] Electrical equipment, including the cylindrical batteries mentioned above.

[0022] The beneficial effects of this invention are as follows:

[0023] The assembly method of the sealing structure of the battery casing proposed in this invention includes the following steps: In step S1, the lower plastic part is installed on the inner top wall of the casing so that the first mounting hole and the second mounting hole are coaxially arranged. In step S2, a sealing ring is fitted around the outer periphery of the terminal post, which passes through the second mounting hole and the first mounting hole in sequence, and the sealing ring is located inside the casing. In step S3, the upper plastic part is fitted around the outer periphery of the terminal post and abuts against the outer top surface of the casing. In step S4, the terminal post is riveted, and the two ends of the terminal post are deformed in the axial direction to form a sealing groove in the circumferential direction of the terminal post, so that the sealing groove clamps the upper plastic part and the sealing ring with the casing, and the lower plastic part is clamped between the inner top wall of the casing and the terminal post around the second inner edge of the second mounting hole. The assembly method of the sealing structure of the battery casing described above allows the upper plastic part and the sealing ring to be clamped in the sealing groove of the terminal post. The upper plastic part and the sealing ring achieve a sealed assembly between the terminal post and the casing, which improves the sealing performance between the terminal post and the casing and avoids the risk of electrolyte evaporation or safety accidents caused by poor sealing between the terminal post and the casing, thereby improving the safety of cylindrical batteries.

[0024] The cylindrical battery proposed in this invention is assembled using the above-mentioned assembly method of the sealed structure of the battery casing, which improves the sealing performance between the terminals and the casing and the safety of the cylindrical battery.

[0025] The electrical device proposed in this invention includes the aforementioned cylindrical battery, which improves the sealing performance and safety of the cylindrical battery. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cylindrical battery structure provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the shell structure provided in an embodiment of the present invention;

[0028] Figure 3 This is a partial cross-sectional view of the cylindrical battery provided in an embodiment of the present invention;

[0029] Figure 4 yes Figure 3 Enlarged view of the local structure at point A;

[0030] Figure 5 This is a schematic diagram of the structure of the upper plastic part provided in an embodiment of the present invention;

[0031] Figure 6 This is a cross-sectional view of the pole provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of the lower plastic part provided in an embodiment of the present invention;

[0033] Figure 8 This is a main flowchart of the assembly method of the sealing structure of the battery casing provided in the embodiments of the present invention;

[0034] Figure 9 This is a detailed flowchart of the assembly method of the sealing structure of the battery casing provided in the embodiment of the present invention.

[0035] The component names and labels in the diagram are as follows:

[0036] 1. Housing; 10. Limiting groove; 11. First mounting hole; 12. First inner edge; 121. Positioning groove; 2. Pole post; 21. Sealing groove; 22. Injection hole; 23. Welding groove; 231. First groove; 232. Second groove; 3. Upper plastic part; 31. Plastic body; 311. Horizontal part; 312. Vertical part; 32. Positioning post; 4. Sealing ring; 5. Lower plastic part; 51. Second mounting hole; 52. Second inner edge; 6. Cap; 61. Welding cap; 62. Boss; 7. Glue pin. Detailed Implementation

[0037] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1-7 As shown, this embodiment proposes a cylindrical battery, which includes a sealed structure for the battery casing. The sealed structure for the battery casing includes a casing 1, a terminal post 2, an upper plastic part 3, a sealing ring 4, and a lower plastic part 5. By assembling the casing 1, the terminal post 2, the upper plastic part 3, the sealing ring 4, and the lower plastic part 5, the sealing performance between the terminal post 2 and the casing 1 is improved, ensuring the sealing performance and safety of the cylindrical battery.

[0043] It should be noted that the aforementioned housing 1 is a cylindrical shell. One axial end of the cylindrical shell has a first mounting hole 11 and a first inner edge 12 surrounding the first mounting hole 11. That is, one axial end of the cylindrical shell is closed and has the first mounting hole 11 extending through it, while the other axial end of the cylindrical shell is open, allowing the battery cell to be installed inside the housing 1 through the open end. A bottom cover is welded to the open end of the housing 1 to ensure the airtightness of the interior of the housing 1. The bottom cover is also welded to the negative current collector at the bottom of the battery cell. Since both the bottom cover and the battery cell are existing technologies, their structures will not be described in detail. Figure 4 and Figure 7 As shown, the lower plastic part 5 is provided with a second mounting hole 51, and the lower plastic part 5 has a second inner edge 52 surrounding the second mounting hole 51. The lower plastic part 5 is installed between the inner top wall of the housing 1 and the battery cell inside the housing 1 to achieve insulation between the battery cell and the housing 1.

[0044] like Figure 8As shown, this embodiment also proposes an assembly method for a sealing structure of a battery casing. The assembly method for the sealing structure of the battery casing includes the following steps: S1, the lower plastic part 5 is installed on the inner top wall of the casing 1 so that the first mounting hole 11 and the second mounting hole 51 are coaxially arranged; S2, the sealing ring 4 is sleeved on the outer periphery of the terminal post 2, the terminal post 2 passes through the second mounting hole 51 and the first mounting hole 11 in sequence, and the sealing ring 4 is located inside the casing 1; S3, the upper plastic part 3 is sleeved on the outer periphery of the terminal post 2 and abuts against the outer top surface of the casing 1; S4, the terminal post 2 is riveted, the two ends of the terminal post 2 are deformed in the axial direction and a sealing groove 21 is formed in the circumferential direction of the terminal post 2, so that the sealing groove 21 clamps the upper plastic part 3 and the sealing ring 4 with the casing 1, and the lower plastic part 5 surrounds the second inner edge 52 of the second mounting hole 51 and clamps between the inner top wall of the casing 1 and the terminal post 2. By using the above-described assembly method of the sealing structure of the battery casing, the upper plastic part 3 and the sealing ring 4 are clamped in the sealing groove 21 of the terminal post 2 within the casing 1. The upper plastic part 3 and the sealing ring 4 achieve a sealed assembly between the terminal post 2 and the casing 1, thereby improving the sealing performance between the terminal post 2 and the casing 1. This avoids the risk of electrolyte evaporation or safety accidents caused by poor sealing between the terminal post 2 and the casing 1, and improves the safety of the cylindrical battery.

[0045] When the electrode post 2 is installed in the first mounting hole 11 and the second mounting hole 51, it is fixed and sealed by riveting. That is, the two ends of the electrode post 2 are deformed in the axial direction and the electrode post 2 is formed into an I-shaped structure. At this time, the electrode post 2 is clamped on the inner and outer sides of the housing 1 and cooperates with the lower plastic part 5. The second inner edge 52 of the lower plastic part 5 is clamped between the bottom of the electrode post 2 and the inner top wall of the housing 1, which further improves the sealing effect between the electrode post 2 and the housing 1.

[0046] like Figure 2 As shown, a limiting groove 10 is provided at one axial end of the housing 1, and a first mounting hole 11 is coaxially provided on the bottom wall of the limiting groove 10 so that the bottom wall of the limiting groove 10 forms a first inner edge 12. Through the above arrangement, the upper plastic part 3 is pressed against the bottom wall of the limiting groove 10 (i.e., the first inner edge 12), realizing the compact assembly of the upper plastic part 3 and the housing 1. At the same time, the thickness of the first inner edge 12 is reduced to decrease the width dimension of the sealing groove 21 along the axial direction of the electrode post 2, making the overall height of the electrode post 2 smaller, which is conducive to realizing the miniaturization design of the battery.

[0047] like Figures 2-4As shown, the upper plastic part 3 includes a plastic body 31 and a positioning post 32 protruding from the plastic body 31. A positioning groove 121 is provided on the outer top surface of the housing 1. In step S3, the plastic body 31 is fitted onto the outer periphery of the pole post 2 and abuts against the outer top surface of the housing 1, and the positioning post 32 is inserted into the corresponding positioning groove 121. Through the insertion and engagement of the positioning post 32 and the positioning groove 121, the upper plastic part 3 is positioned and installed, preventing the upper plastic part 3 from rotating relative to the housing 1 around the pole post 2 axially, thus improving the sealing performance between the upper plastic part 3 and the housing 1.

[0048] Specifically, such as Figure 2 As shown, the first inner edge 12 of the housing 1 is provided with a plurality of positioning grooves 121 spaced circumferentially along the first mounting hole 11. For example... Figure 5 As shown, the upper plastic part 3 is provided with multiple positioning posts 32 spaced apart along the circumference. The multiple positioning posts 32 are inserted into and engaged with multiple positioning grooves 121 in a one-to-one manner to improve the stability of the relative position between the upper plastic part 3 and the housing 1. The number of positioning posts 32 and positioning grooves 121 can be flexibly adjusted according to requirements, and no specific limitation is made here.

[0049] In step S4, before riveting the electrode post 2, the sealing ring 4 is pre-compressed by extruding the housing 1 to reduce the thickness of the sealing ring 4. Pre-compressing the sealing ring 4 first reduces its thickness, thereby reducing the space occupied by the sealing ring 4 within the sealing groove 21. This prevents the sealing groove 21 from excessively compressing the upper plastic part 3 during the riveting of the electrode post 2, which could damage the upper plastic part 3 and improves its protection.

[0050] Specifically, such as Figure 4 and Figure 5 As shown, the plastic body 31 includes an integrally connected L-shaped horizontal portion 311 and a vertical portion 312. The horizontal portion 311 is sandwiched between the upper top wall of the sealing groove 21 and the upper surface of the first inner edge 12, and the vertical portion 312 is sandwiched between the inner side wall of the sealing groove 21 and the inner side surface of the first inner edge 12. Through this arrangement, the plastic body 31 is clamped between the pole post 2 and the first inner edge 12, ensuring a tight fit between the pole post 2 and the upper plastic part 3, and between the upper plastic part 3 and the housing 1, thus improving the sealing performance between the pole post 2 and the housing 1. Furthermore, the L-shaped plastic body 31, together with the sealing ring 4, forms a structure that encloses the first inner edge 12, achieving good insulation between the pole post 2 and the housing 1.

[0051] It should be noted that before step S1, the electrode post 2 is prepared and an injection hole 22 is opened in the electrode post 2. For example... Figure 3 and Figure 6As shown, the electrode post 2 has an axially extending injection hole 22 that communicates with the interior of the housing 1. The injection hole 22 is provided inside the electrode post 2 to inject electrolyte into the housing 1. Since it is not necessary to machine the injection hole 22 onto the housing 1, there is no need to weld components to seal the injection hole 22 onto the housing 1, reducing the risk of rust on the housing 1 and improving its protection.

[0052] like Figure 9 As shown, the sealing structure of the battery casing also includes a bottom cover, which is welded to the other end of the casing 1 along the axial direction. Step S5 follows step S4: after the battery cell is installed inside the casing 1, the bottom cover is welded to the other end of the casing 1 along the axial direction. By welding the bottom cover to the bottom of the casing 1, good sealing performance of the casing 1 is ensured, preventing electrolyte leakage.

[0053] like Figure 3 and Figure 6 As shown, the sealing structure of the battery casing also includes a cap 6. After riveting, the terminal post 2 forms a welding groove 23 at its top that communicates with the injection hole 22. Following step S5, step S6 is included: after adding electrolyte into the casing 1 through the injection hole 22, the cap 6 is welded to the welding groove 23 to seal it. Welding the cap 6 to the welding groove 23 seals the injection hole 22, thus preventing electrolyte leakage. Furthermore, the welding connection between the terminal post 2 and the cap 6 improves the connection strength and structural stability between the cap 6 and the terminal post 2.

[0054] like Figure 3 As shown, the sealing structure of the battery casing also includes a rubber stud 7. In step S6, before welding the cap 6, the rubber stud 7 is inserted into the injection hole 22. When the rubber stud 7 is inserted into the injection hole 22, the head of the rubber stud 7 is located in the welding groove 23, so that the head of the rubber stud 7 covers the injection hole 22, thereby achieving a reliable seal of the injection hole 22 by the rubber stud 7.

[0055] It should be noted that in step S6, the cap 6 is squeezed into the welding groove 23, so that the top of the cap 6 after welding is coplanar with the top of the pole post 2, and the cap 6 presses against the adhesive nail 7. By pressing the head of the adhesive nail 7 against the cap 6, the adhesive nail 7 is pressed tightly against the injection hole 22, improving the sealing effect of the adhesive nail 7 on the injection hole 22. That is, on the one hand, the cap 6 is welded to the welding groove 23 to achieve the sealing of the injection hole 22, and on the other hand, the injection hole 22 is sealed by squeezing the adhesive nail 7, thus achieving a double sealing effect on the injection hole 22.

[0056] Specifically, the welding groove 23 includes a first groove 231 and a second groove 232, which are sequentially connected to the injection hole 22. A stepped surface exists between the first groove 231 and the second groove 232. The cap 6 includes a welding cover 61 and a boss 62. The boss 62 is provided on one side of the welding cover 61. The welding cover 61 is welded into the first groove 231 and overlaps with the stepped surface. The boss 62 extends into the second groove 232 and presses against the nail head. By setting the welding groove 23 as a stepped groove, the welding cover 61 is welded to the inner wall of the first groove 231 through the overlapping fit between the stepped surface between the first groove 231 and the second groove 232 and the welding cover 61 of the cap 6. This increases the contact area and welding area between the cap 6 and the welding groove 23, thereby improving the welding stability of the cap 6. Furthermore, it achieves positioning welding of the cap 6, improving the welding accuracy of the cap 6.

[0057] After the cap 6 is welded to the first groove 231, the top of the cap 6 is coplanar with the top of the pole 2, so that the top of the pole 2 with the cap 6 welded on forms a large area of ​​flat surface, which is convenient for subsequent welding to the aluminum bar.

[0058] like Figure 3 and Figure 6 As shown, along the axial direction of the pole post 2, the inner wall of the second groove 232 is inclined from top to bottom towards the inside of the pole post 2, and the circumferential side of the boss 62 is in contact with the inner wall of the second groove 232. This arrangement makes the inner wall of the second groove 232 a guide surface inclined towards the inside of the pole post 2, guiding the cap 6 to quickly enter the welding groove 23, thus improving the welding efficiency between the cap 6 and the pole post 2. The boss 62 of the cap 6 is a conical platform, and the conical surface of the platform is in contact with the inner wall of the second groove 232, resulting in better stability of the cap 6 during the welding process and improving the welding accuracy of the cap 6.

[0059] This embodiment also proposes an electrical device that includes the cylindrical battery described above. The electrical device can be, but is not limited to, devices that require power supply, such as aircraft, vehicles, ships, power tools, electric toys, and electronic devices. For example, the electrical device is a vehicle.

[0060] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for assembling a sealing structure for a battery casing, the sealing structure of the battery casing comprising a casing (1), a terminal post (2), an upper plastic part (3), a sealing ring (4), and a lower plastic part (5), wherein the casing (1) has a first mounting hole (11) at one axial end, and the lower plastic part (5) has a second mounting hole (51), characterized in that, The assembly method of the sealing structure of the battery casing includes the following steps: S1: The lower plastic part (5) is installed on the inner top wall of the housing (1) so that the first mounting hole (11) and the second mounting hole (51) are coaxially arranged; S2: The sealing ring (4) is sleeved on the outer periphery of the pole post (2), the pole post (2) passes through the second mounting hole (51) and the first mounting hole (11) in sequence, and the sealing ring (4) is located inside the housing (1); S3: The upper plastic part (3) is sleeved on the outer periphery of the pole post (2) and abuts against the outer top surface of the housing (1); S4: Rivet the pole post (2), deform the two ends of the pole post (2) in the axial direction and form a sealing groove (21) in the circumferential direction of the pole post (2), so that the sealing groove (21) and the housing (1) clamp the upper plastic part (3) and the sealing ring (4), and the lower plastic part (5) is clamped between the inner top wall of the housing (1) and the pole post (2) around the second inner edge (52) of the second mounting hole (51).

2. The assembly method of the sealing structure of the battery casing according to claim 1, characterized in that, The upper plastic part (3) includes a plastic body (31) and a positioning post (32) protruding from the plastic body (31). The outer top surface of the housing (1) is provided with a positioning groove (121). In step S3, the plastic body (31) is fitted around the periphery of the pole post (2) and abuts against the outer top surface of the housing (1), and the positioning post (32) is inserted into the corresponding positioning groove (121).

3. The assembly method of the sealing structure of the battery casing according to claim 1, characterized in that, In step S4, before riveting the pole post (2), the sealing ring (4) is pre-compressed by squeezing the housing (1) to reduce the thickness of the sealing ring (4).

4. The assembly method of the sealing structure of the battery casing according to claim 1, characterized in that, Before step S1, the electrode (2) is prepared and an injection hole (22) is opened in the electrode (2).

5. The assembly method of the sealing structure of the battery casing according to claim 4, characterized in that, The sealing structure of the battery casing also includes a bottom cover, which is welded to the other end of the casing (1) along its axial direction; after step S4, the following step is also included: S5: After the battery cell is installed in the housing (1), the bottom cover is sealed and welded to the other end of the housing (1) in the axial direction.

6. The assembly method of the sealing structure of the battery casing according to claim 5, characterized in that, The sealing structure of the battery casing also includes a cap (6), and the electrode post (2) is riveted to form a welding groove (23) at its top that communicates with the liquid injection hole (22); after step S5, the following step is also included: S6: After adding electrolyte into the housing (1) through the injection hole (22), the cap (6) is sealed and welded into the welding groove (23).

7. The assembly method of the sealing structure of the battery casing according to claim 6, characterized in that, The sealing structure of the battery casing also includes a glue pin (7); in step S6, before welding the cap (6), the glue pin (7) is inserted into the injection hole (22).

8. The assembly method of the sealing structure of the battery casing according to claim 7, characterized in that, In step S6, the cap (6) is pressed into the welding groove (23) so that the top of the cap (6) after welding is coplanar with the top of the pole (2) and the cap (6) presses against the glue nail (7).

9. A cylindrical battery, characterized in that, The battery casing includes a housing (1), a terminal post (2), an upper plastic part (3), a sealing ring (4), and a lower plastic part (5). The housing (1), the terminal post (2), the upper plastic part (3), the sealing ring (4), and the lower plastic part (5) are assembled by the assembly method of the sealing structure of the battery casing according to any one of claims 1-8.

10. Electrical equipment, characterized in that, Includes the cylindrical battery as described in claim 9.

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