Cylindrical battery

Abstract

A cylindrical battery, comprising a battery casing (11), a battery post (12), and a corner sealing structure (13). The battery casing (11) has an accommodating chamber (111), and is provided with a mounting hole (113) leading to the accommodating chamber (111); the battery post (12) passes through the mounting hole (113), one end of the battery post (12) being located in the accommodating chamber (111); the corner sealing structure (13) passes through the mounting hole (113) and is located between the battery casing (11) and the battery post (12), one end of the corner sealing structure (13) being located in the accommodating chamber (111). The battery casing (11) is provided with an arc chamfer (112) at a corner of the junction between the mounting hole (113) and the accommodating chamber (111), and the corner sealing structure (13) can be compressively deformed so as to seal a gap between the battery post (11) and the battery casing (12) at the arc chamfer (112).

Description

Cylindrical batteries

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 27, 2023, with application number 202323603868.4, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery sealing technology, for example, to a cylindrical battery. Background Art

[0003] In order to prevent leakage of electrolyte in the battery housing, a sealing ring needs to be provided between the battery pole and the battery housing. There is a corner at the position where the sealing ring is provided in the battery housing.

[0004] In the related art, the sealing ring is generally directly set between the battery housing and the battery pole, and then the sealing ring is bent at the corner to complete the installation. However, this sealing method results in poor sealing at the corner of the battery housing.

[0005] Summary of the Invention

[0006] The present application provides a cylindrical battery with good sealing performance at the corners of the battery casing.

[0007] An embodiment of the present application provides a cylindrical battery, comprising: a battery shell, the battery shell having a accommodating cavity, the battery shell being provided with a mounting hole connected to the accommodating cavity; a battery pole, the battery pole being passed through the mounting hole, one end of the battery pole being located in the accommodating cavity; a corner sealing structure, the corner sealing structure being passed through the mounting hole and located between the battery shell and the battery pole, one end of the corner sealing structure being located in the accommodating cavity; wherein the battery shell is provided with an arc chamfer at the corner where the mounting hole and the accommodating cavity intersect, and the corner sealing structure can be compressed and deformed to seal the gap between the battery pole and the battery shell at the arc chamfer.

[0008] In one embodiment, the corner sealing structure is made of plastic.

[0009] In one embodiment, the corner sealing structure includes a first sealing section and a second sealing section, and the first sealing section is connected to the second sealing section; the first sealing section is extended along the radial direction of the cylindrical battery, and the battery post is pressed on the first sealing section, and the first sealing section is configured to seal the gap between the battery post and the outer surface of the battery shell; the second sealing section is bent, and the bent section of the second sealing section abuts against the arc chamfer at the corner of the battery shell, and is configured to seal the battery post and the arc chamfer at the corner of the battery shell.

[0010] In one embodiment, the second sealing section also includes a first section and a second section, and the bending section is connected between the first section and the second section; the first section is located between the battery pole and the hole wall of the mounting hole, and the second section is located between the battery pole and the inner wall surface of the battery shell.

[0011] In one embodiment, the thickness of the first sealing section is 0.5 mm; the thickness of the first section is 0.7 mm; the thickness of the second section is 0.4 mm; and the radius of the bending section facing the battery pole is 0.8 mm.

[0012] In one embodiment, a first protrusion is provided on a side of the second section facing the battery housing, and a first groove corresponding to the first protrusion is provided on an inner surface of the battery housing.

[0013] In one embodiment, a second protrusion is provided on a side of the second sealing section facing the battery pole, and a second groove cooperating with the second protrusion is correspondingly provided on a side of the battery pole facing the second sealing section.

[0014] In one embodiment, the corner sealing structure further includes a connecting section, which is connected to one end of the first sealing section away from the second sealing section; taking a plane perpendicular to the axis of the battery casing as a reference plane, the orthographic projection of the battery pole on the reference plane is located within the orthographic projection of the connecting section on the reference plane.

[0015] In one embodiment, the battery housing is made of steel.

[0016] In one embodiment, the battery pole and the corner sealing structure are riveted to the battery casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram of the assembly of a cylindrical battery in an embodiment of the present application;

[0018] FIG2 is a partial enlarged schematic diagram of point A in FIG1 of the present application;

[0019] FIG3 is a schematic structural diagram of a cylindrical battery before riveting the battery pole and the corner sealing structure in an embodiment of the present application;

[0020] FIG4 is a schematic structural diagram of a cylindrical battery in the process of pre-riveting the battery pole and corner sealing structure in FIG3 of the present application;

[0021] FIG5 is a schematic structural diagram of a cylindrical battery during the process of continuing pre-riveting of the battery pole and the corner sealing structure in FIG4 of the present application.

[0022] Description of Figure Numbers:

[0023] 10. Cylindrical battery; 11. Battery shell; 111. Accommodation cavity; 112. Arc chamfer; 113. Mounting hole; 12. Battery pole; 121. Bending part; 13. Corner sealing structure; 131. First sealing section; 132. Second sealing section; 1321. First section; 1322. Second section; 1323. Bending section; 133. Connecting section. DETAILED DESCRIPTION

[0024] The technical solution of this application will be described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," "outside," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. A person of ordinary skill in the art will understand the meaning of the above terms in this application based on the circumstances.

[0027] Referring to Figures 1 and 2, the present application provides a cylindrical battery 10, comprising a battery shell 11, a battery post 12, and a corner sealing structure 13. The battery shell 11 has a receiving cavity 111, and the battery shell 11 is provided with a mounting hole 113 connected to the receiving cavity 111; the battery post 12 is passed through the mounting hole 113, and one end of the battery post 12 is located in the receiving cavity 111; the corner sealing structure 13 is passed through the mounting hole 113 and is located between the battery shell 11 and the battery post 12, and one end of the corner sealing structure 13 is located in the receiving cavity 111. The battery shell 11 is provided with an arc chamfer 112 at the corner where the mounting hole 113 and the receiving cavity 111 intersect. The corner sealing structure 13 can be compressed and deformed to seal the gap between the battery post 12 and the battery shell 11 at the arc chamfer 112.

[0028] In this embodiment, the battery housing 11 , the battery pole 12 and the corner sealing structure 13 are coaxially arranged.

[0029] Thus, in the present application, by providing a circular chamfer 112 at the corner of the battery housing 11 , the corner sealing structure 13 can be more easily fitted and pressed against the circular chamfer 112 after compression and deformation, thereby facilitating improvement of the sealing performance at the corner of the battery housing 11 .

[0030] Compared with the related art that directly bends the sealing ring at the corner of the battery shell 11 and installs it, the corner of the battery shell 11 of the related art is set to a right angle, while this embodiment provides an arc chamfer 112 at the corner of the battery shell 11, and then provides a corner sealing structure 13 that can be compressed and deformed, so that the corner sealing structure 13 can fit tightly with the arc chamfer 112, thereby improving the sealing performance of the corner of the battery shell 11.

[0031] In some embodiments, the corner sealing structure 13 is made of plastic, that is, the corner sealing structure 13 is a plastic part. Plastic can be compressed and deformed under external force, so that the corner sealing structure 13 can fit tightly with the chamfered arc at the corner of the battery housing 11, thereby improving the sealing performance of the corner of the battery housing 11. In addition, plastic is an insulating material and can provide insulation.

[0032] In some embodiments, referring to Figures 1 and 2, the corner sealing structure 13 includes a first sealing segment 131 and a second sealing segment 132, and the first sealing segment 131 is connected to the second sealing segment 132. The first sealing segment 131 extends along the radial direction of the cylindrical battery 10, and the battery post 12 is pressed onto the first sealing segment 131. The first sealing segment 131 is configured to seal the gap between the battery post 12 and the outer surface of the battery housing 11. The second sealing segment 132 is bent, and the bent section 1323 of the second sealing segment 132 abuts against the arc chamfer 112 at the corner of the battery housing 11, and is configured to seal the arc chamfer 112 at the corner of the battery post 12 and the battery housing 11.

[0033] In some embodiments, referring to Figures 1 and 2, the second sealing segment 132 further includes a first segment 1321 and a second segment 1322, with a bent segment 1323 connected between the first segment 1321 and the second segment 1322. The first segment 1321 is located between the battery post 12 and the wall of the mounting hole 113, and the second segment 1322 is located between the battery post 12 and the inner wall of the battery housing 11. The wall of the mounting hole 113 is also the inner wall of the battery housing 11.

[0034] In this way, by setting the first section 1321, the first section 1321 seals the battery pole 12 and the inner wall of the battery shell 11; by setting the second section 1322, the second section 1322 seals the battery pole 12 and the inner wall surface of the battery shell 11.

[0035] It can be understood that in this embodiment, the corner sealing structure 13 is an integrally molded structure, and the first sealing section 131, the first section 1321, the second section 1322 and the bending section 1323 are all configured to seal the gap between the battery pole 12 and the battery shell 11, sealing different positions respectively to form multiple seals, thereby enhancing the sealing effect between the battery pole 12 and the battery shell 11.

[0036] In some embodiments, referring to FIG2 , the thickness dimension d1 of the first sealing segment 131 is 0.5 mm; the thickness dimension d2 of the first segment 1321 is 0.7 mm; the thickness dimension d3 of the second segment 1322 is 0.4 mm; the radius r1 of the side of the bent segment 1323 facing the battery post 12 is 0.8 mm; and the radius r2 of the arc chamfer 112 is 0.2 mm. It is understood that the above dimensions of the corner sealing structure 13 may vary for different models of cylindrical batteries 10 and may be set according to the actual conditions such as the model of the cylindrical battery 10 and usage requirements. They are not limited to the dimensions listed above in this embodiment, as long as they can meet actual usage requirements.

[0037] In some embodiments, the second section 1322 is provided with a first protrusion (not shown) on the side facing the battery housing 11, and the inner surface of the battery housing 11 is provided with a corresponding first groove (not shown) that cooperates with the first protrusion. In this way, by providing the first protrusion and the first groove, the sealing effect between the battery post 12 and the battery housing 11 can be further strengthened.

[0038] In some embodiments, a second protrusion (not shown) is provided on the side of the second sealing section 132 facing the battery post 12, and a second groove (not shown) is provided on the side of the battery post 12 facing the second sealing section 132 to cooperate with the second protrusion. In this way, by providing the second protrusion and the second groove, the sealing effect between the battery post 12 and the battery housing 11 can be further enhanced.

[0039] It is understandable that the first protrusion and the first groove can be provided in plurality, and the second protrusion and the second groove can be provided in plurality. All the first protrusions, all the first grooves, all the second protrusions and all the second grooves are arranged at intervals around the axis of the battery housing 11. The number can be set according to the actual conditions such as the size and usage requirements of the cylindrical battery 10, which will not be described in detail here. In addition, although the simultaneous provision of the first protrusion, the first groove, the second protrusion and the second groove can greatly improve the sealing performance, due to the thin thickness of the corner sealing structure 13, it is difficult to provide the first protrusion and the second protrusion on the corner sealing structure 13 at the same time, which is not conducive to processing and requires relatively high precision. Therefore, generally, only one of the two can be provided, that is, only the first protrusion and the first groove are provided, or only the second protrusion and the second groove are provided.

[0040] In some embodiments, referring to FIG1 , the corner sealing structure 13 further includes a connecting segment 133 connected to an end of the first sealing segment 131 away from the second sealing segment 132. With a plane perpendicular to the axis of the battery housing 11 as a reference plane, the orthographic projection of the battery post 12 on the reference plane lies within the orthographic projection of the connecting segment 133 on the reference plane.

[0041] In some embodiments, the battery housing 11 is made of steel, which has high strength. The steel shell of the battery housing 11 is conducive to improving the service life of the battery housing 11. It is understandable that the battery housing 11 can also be an aluminum shell or a shell made of other materials that can meet actual usage requirements, and no further limitations are given here.

[0042] In some embodiments, the battery pole 12 and the corner sealing structure 13 are riveted to the battery housing 11 .

[0043] Referring to Figures 1 to 5, the process of riveting the battery column 12, the corner sealing structure 13, and the battery shell 11 is briefly described. Figure 1 is a schematic structural diagram of the cylindrical battery 10 after the battery column 12 and the corner sealing structure 13 are riveted together as shown in Figure 4. In Figure 3, before riveting, a circular chamfer 112 is first set at the corner of the battery shell 11, and the radius r2 of the circular chamfer 112 is 0.2mm. The corner sealing structure 13 and the battery column 12 are placed in the mounting hole 113 of the battery shell 11 in sequence. At this time, the thickness dimension d4 of the second sealing section 132 is 0.7mm, and the thickness dimension d5 of the bent portion 121 of the battery column 12 is 0.6mm. In Figure 4, during the pre-riveting process, the second sealing section 132 and the bent portion 121 of the battery column 12 are both bent. At this time, due to the compression deformation, the thickness dimension of the end of the second section 1322 close to the first section 1321 is smaller than the thickness dimension of the end of the second section 1322 away from the first section 1321. The distance d6 between the arc chamfer 112 at the corner of the battery shell 11 and the second sealing section 132 is 0.65mm. The thickness dimension of the end of the bent portion 121 of the battery column 12 close to the first section 1321 is larger than the thickness dimension of the end of the bent portion 121 away from the first section 1321. The thickness dimension d7 of the end of the bent portion 121 away from the first section 1321 is 0.49mm. In Figure 5, the pre-riveting process continues, further compressing and bending the second sealing segment 132 and the bent portion 121 of the battery column 12. At this time, the thickness of the second sealing segment 132 is further reduced due to compression, and the distance d8 between the arc chamfer 112 at the corner of the battery shell 11 and the second sealing segment 132 is 0.45mm. The thickness of the bent portion 121 of the battery column 12 is also further reduced, and the thickness dimension d9 of the end of the bent portion 121 away from the first segment 1321 is 0.45mm. In Figure 1, riveting is continued so that the opposite side surfaces of the second segment 1322 are respectively in contact with the inner wall surface of the battery shell 11 and the outer surface of the bent portion 121 of the battery column 12. Among them, in Figures 1 to 5, the thickness dimension d1 of the first sealing segment 131 is 0.5mm.

[0044] During the riveting process, the second sealing segment 132 is gradually bent and compressed through the three steps of Figure 4, Figure 5, and Figure 1. At the arc chamfer 112 position at the corner of the battery shell 11 in the third step of Figure 1, the thickness of the second sealing segment 132 is compressed to a minimum, thereby achieving a sealing effect. In addition, due to the large amount of compression of the second sealing segment 132 during riveting, the airtightness requirements are met after the assembly consisting of the battery shell 11, the battery pole 12, and the corner sealing structure 13 is subjected to high-temperature baking or hot and cold shock or high-temperature and high-humidity testing. The pressure test of the battery shell 11 (in this embodiment, the battery shell 11 is a steel shell) can meet the airtightness requirements. After the assembly consisting of the battery shell 11, the battery pole 12, and the corner sealing structure 13 is subjected to high-temperature baking, due to the large amount of compression of the corner sealing structure 13, the creep of the corner sealing structure 13 caused by high temperature is reduced, thereby reducing the impact on the height size of the battery pole 12 and the steel shell.

Claims

1. A cylindrical battery, comprising: A battery housing (11), the battery housing (11) having a receiving cavity (111), and the battery housing (11) being provided with a mounting hole (113) communicating with the receiving cavity (111); A battery terminal (12), the battery terminal (12) passing through the mounting hole (113), and one end of the battery terminal (12) being located within the receiving cavity (111); A corner sealing structure (13), the corner sealing structure (13) passing through the mounting hole (113) and being located between the battery housing (11) and the battery terminal (12), and one end of the corner sealing structure (13) being located within the receiving cavity (111); Wherein, the battery housing (11) is provided with a circular arc chamfer (112) at the corner where the mounting hole (113) intersects with the receiving cavity (111), and the corner sealing structure (13) can be compressed and deformed to seal the gap between the battery terminal (12) and the battery housing (11) at the circular arc chamfer (112).

2. The cylindrical battery according to claim 1, wherein, The material of the corner sealing structure (13) is plastic.

3. The cylindrical battery according to claim 1, wherein, The corner sealing structure (13) includes a first sealing section (131) and a second sealing section (132), and the first sealing section (131) is connected to the second sealing section (132); The first sealing section (131) extends along the radial direction of the cylindrical battery (10), the battery terminal (12) being pressed on the first sealing section (131), and the first sealing section (131) being configured to seal the gap between the battery terminal (12) and the outer surface of the battery housing (11); The second sealing section (132) is bent, and the bent section (1323) of the second sealing section (132) abuts against the circular arc chamfer (112) at the corner of the battery housing (11), being configured to seal the gap between the battery terminal (12) and the circular arc chamfer (112) at the corner of the battery housing (11).

4. The cylindrical battery according to claim 3, wherein, The second sealing section (132) further includes a first section (1321) and a second section (1322), and the bent section (1323) is connected between the first section (1321) and the second section (1322); the first section (1321) is located between the battery terminal (12) and the hole wall of the mounting hole, and the second section (1322) is located between the battery terminal (12) and the inner wall surface of the battery housing (11).

5. The cylindrical battery according to claim 4, wherein, The thickness dimension of the first sealing section (131) is 0.5 mm; the thickness dimension of the first section (1321) is 0.7 mm; the thickness dimension of the second section (1322) is 0.4 mm; the radius of the side of the bent section (1323) facing the battery terminal (12) is 0.8 mm.

6. The cylindrical battery according to claim 4, wherein, The second section (1322) is provided with a first protrusion on the side facing the battery housing (11), and the inner surface of the battery housing (11) is correspondingly provided with a first groove for cooperating with the first protrusion.

7. The cylindrical battery according to claim 3, wherein, A second protrusion is provided on one side of the second sealing section (132) facing the battery pole (12), and a second groove cooperating with the second protrusion is correspondingly provided on one side of the battery pole (12) facing the second sealing section (132).

8. The cylindrical battery according to claim 3, wherein, The corner sealing structure (13) further includes a connecting section (133), and the connecting section (133) is connected to one end of the first sealing section (131) away from the second sealing section (132); Taking a plane perpendicular to the axis of the battery housing (11) as a reference plane, the orthographic projection of the battery pole (12) on the reference plane is located within the orthographic projection of the connecting section (133) on the reference plane.

9. The cylindrical battery according to any one of claims 1-8, wherein, The material of the battery housing (11) is steel.

10. The cylindrical battery according to any one of claims 1-8, wherein, Both the battery pole (12) and the corner sealing structure (13) are riveted to the battery housing (11).

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