Cylindrical battery upper cover sealing assembly and cylindrical battery

Abstract

The utility model provides a cylindrical battery upper cover sealing assembly and a cylindrical battery, and relates to the technical field of cylindrical batteries. The cylindrical battery upper cover sealing assembly comprises a shell, a pole assembly and a sealing piece, the shell is provided with a shell opening, the section of the shell opening is a first inclined plane, and the shell opening extends away from an inner cavity of the shell; the pole assembly comprises an inner pole and an outer pole wrapping the periphery of the inner pole, and the outer pole is provided with a second inclined plane matched with the first inclined plane in parallel; the first inclined surface extends into the shell opening, and at least part of the structure of the outer pole is arranged above the shell opening in a covering manner; and the sealing piece is configured to be extruded and sealed between the first inclined surface and the second inclined surface. Therefore, by adopting an upward inclined surface sealing mode of the shell opening, the space in the height direction in the battery is not occupied, and the energy density of the battery can be effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cylindrical batteries, and in particular to a cylindrical battery upper cover sealing assembly and a cylindrical battery. Background Art

[0002] At present, the sealing method of the upper cover of cylindrical batteries is mostly to rivet the pole and the busbar, and the upper cover and the shell are sealed by laser welding the shell and the pole. In the existing production process, the upper cover has many parts and complex connections, and there is an insulating layer between the busbar and the pole, which will result in low space utilization. Utility Model Content

[0003] The present disclosure provides a cylindrical battery upper cover sealing assembly and a cylindrical battery to at least solve the above technical problems existing in the prior art.

[0004] According to a first aspect of the present disclosure, a cylindrical battery upper cover sealing assembly is provided, comprising: a shell, a pole assembly and a seal, wherein the shell has a shell opening, the shell opening cross-section presents a first inclined surface and extends away from the inner cavity of the shell; the pole assembly comprises an inner pole and an outer pole wrapped around the outer periphery of the inner pole, the outer pole having a second inclined surface parallel to and matching the first inclined surface; the first inclined surface extends into the shell opening, and at least a portion of the structure of the outer pole is covered above the shell opening; the seal is configured to be squeezed and sealed between the first inclined surface and the second inclined surface.

[0005] In some embodiments, the shell opening, the outer pole and the sealing member are integrally formed.

[0006] In some embodiments, the cylindrical battery upper cover sealing assembly further includes an insulating member, and the insulating member is isolated between the outer pole and the shell opening along the longitudinal direction.

[0007] In some embodiments, the outer pole also has a first planar main body and a connecting portion connected to the first planar main body and extending along the longitudinal direction toward the inner cavity of the shell, an acute angle is formed between the first planar main body, the connecting portion and the second inclined surface, and the insulating member, the shell opening and the sealing member are squeezed and sealed at the acute angle.

[0008] In some embodiments, the outer pole, the seal and the shell opening are configured as an extruded integrally formed sealing structure.

[0009] In some embodiments, the cylindrical battery top cover sealing assembly also includes a busbar, which is constructed into an irregular shape that matches the shell opening and the inner top surface of the shell, the structure that matches the shell opening is the short side, and the structure that matches the inner top surface of the shell is the long side, the short side is welded to the inner pole, and the long side is welded to the internal pole ear of the battery cell.

[0010] In some embodiments, the cylindrical battery upper cover sealing assembly further includes an isolating member, and the isolating member is sandwiched between the inner top surface of the shell and the busbar.

[0011] In some embodiments, the outer periphery of the top surface of the inner pole has a recessed portion, and the inner periphery of the outer pole has a protruding clamping portion, the recessed portion is engaged with the clamping portion, and the top surface of the inner pole and the top surface of the outer pole are configured to be flush and sealed welded.

[0012] In some embodiments, the shell opening has a cross-section that is a trapezoidal structure with a longitudinal opening.

[0013] According to a second aspect of the present disclosure, a cylindrical battery is provided, comprising the cylindrical battery upper cover sealing assembly as above, and further comprising: a battery cell accommodated in the shell, the battery cell comprising an internal tab of the battery cell, and the long side of the busbar is welded to the internal tab of the battery cell.

[0014] By using the cylindrical battery upper cover sealing assembly and the cylindrical battery disclosed in the present invention, the shell opening of the shell is set to have a first inclined surface in cross section and extend away from the inner cavity of the shell, so that the shell opening protrudes from the top surface of the shell and is folded upward. At the same time, considering the functional characteristics of the pole itself, the pole assembly is designed to be an inner pole and an outer pole wrapped around the outer periphery of the inner pole. In this way, the outer pole can be squeezed and sealed with the seal and the shell opening position alone. Since the cross section of the shell opening is a first inclined surface, the outer pole has a second inclined surface parallel to and matching the first inclined surface, which further limits the seal to be squeezed and sealed between the first inclined surface and the second inclined surface. In this way, it can be further ensured that the sealing position of the seal is located above the shell and does not occupy the internal space of the shell.

[0015] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0017] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0018] Figure 1 A schematic cross-sectional structure diagram of a cylindrical battery upper cover sealing assembly according to an embodiment of the present disclosure is shown.

[0019] Description of the numbers in the figure:

[0020] 10-cylindrical battery upper cover sealing assembly; 1-external pole; 2-insulating member; 3-housing; 4-isolating member; 5-busbar; 6-inner pole; 7-sealing member. DETAILED DESCRIPTION

[0021] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0022] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that spatially relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0024] It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein are used to be implemented in an order other than those illustrated or described herein.

[0025] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these directional words 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, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0026] The disclosed embodiments intend to reduce the number of components of the cover plate assembly, simplify the connection process, and improve space utilization through optimized design of the cover plate assembly structure, so as to achieve the purpose of improving the battery energy density.

[0027] The disclosed embodiment provides a cylindrical battery upper cover sealing assembly and a cylindrical battery, which can adopt a shell opening upward inclined sealing method, does not occupy the internal height direction of the battery, and can effectively replace the energy density of the battery. The specific content is described as follows:

[0028] refer to Figure 1 , the embodiment of the present disclosure provides a cylindrical battery upper cover sealing assembly 10, the cylindrical battery upper cover sealing assembly 10 includes: a shell 3, a pole assembly and a seal 7, wherein the shell 3 has a shell opening, the shell opening cross section is a first inclined surface and extends away from the inner cavity of the shell 3; exemplarily, the shell opening cross section is a trapezoidal structure with a longitudinal opening. In addition, the pole assembly includes an inner pole 6 and an outer pole 1 wrapped around the outer periphery of the inner pole 6, the inner pole 6 and the outer pole 1 are functionally distinguished, wherein the outer pole 1 has a second inclined surface that is parallel to and matches the first inclined surface; specifically, the first inclined surface extends into the shell opening, and at least part of the structure of the outer pole 1 is covered above the shell opening; it can be understood that the outer pole 1 itself is enough to be clamped on the inner periphery of the shell opening, further limiting the seal 7 to be squeezed and sealed between the first inclined surface and the second inclined surface, so that the seal 7 can seal the outer pole 1 and the shell opening above the shell 3. Exemplarily, the seal 7 adopts a sealing ring.

[0029] By adopting the cylindrical battery upper cover sealing assembly 10 of the embodiment of the present disclosure, the shell opening of the shell 3 is set to have a first inclined surface in cross section and extend away from the inner cavity of the shell 3, so that the shell opening protrudes from the top surface of the shell 3 and is folded upward. At the same time, considering the functional characteristics of the pole itself, the pole assembly is designed to be an inner pole 6 and an outer pole 1 wrapped around the outer periphery of the inner pole 6. In this way, the outer pole 1 can be squeezed and sealed with the seal 7 and the shell opening position alone. Since the cross section of the shell opening is a first inclined surface, the outer pole 1 has a second inclined surface parallel to and matching the first inclined surface, which further limits the seal 7 to be squeezed and sealed between the first inclined surface and the second inclined surface. In this way, it can be further ensured that the sealing position of the seal 7 is located above the shell 3 and does not occupy the internal space of the shell 3.

[0030] Considering the sealing performance between the shell opening, the outer pole 1 and the seal 7, the shell opening, the outer pole 1 and the seal 7 are limited to be integrally formed. That is, the shell opening, the outer pole 1 and the seal 7 are integrally formed by extrusion sealing, and the extrusion sealing operation is performed above the shell 3, does not occupy the internal space of the shell 3, and can effectively replace the energy density of the battery.

[0031] The structure of the outer pole 1 of the embodiment of the present disclosure is adopted, and a gap position is formed between it and the shell opening. Considering the insulation characteristics between the outer pole 1 and the shell opening, the cylindrical battery upper cover sealing assembly 10 of the embodiment of the present disclosure also includes an insulating member 2, and the insulating member 2 is isolated between the outer pole 1 and the shell opening along the longitudinal direction. Exemplarily, the insulating member 2 is arranged to extend horizontally. Exemplarily, the insulating member 2 adopts an insulating ring. Specifically, the insulating member 2 is sealed and arranged at the aforementioned gap position.

[0032] Furthermore, the outer pole 1 in the cylindrical battery upper cover sealing assembly 10 of the disclosed embodiment also has a first planar main body and a connecting portion connected to the first planar main body and extending toward the inner cavity of the shell 3 along the longitudinal direction, wherein an acute angle is formed between the first planar main body, the connecting portion and the second inclined surface, and the insulating member 2, the shell opening and the sealing member 7 are squeezed and sealed at the acute angle. In this way, the insulating member 2 can play an insulating role between the outer pole 1 and the shell 3.

[0033] Specifically, the outer pole 1, the seal 7 and the shell opening are configured as an extruded integrally formed sealing structure, so that the sealing performance between the outer pole 1 and the shell opening can be fully ensured.

[0034] In addition, the cylindrical battery upper cover sealing assembly 10 of the disclosed embodiment also includes a busbar 5, which is constructed in an irregular shape that matches the shell opening and the inner top surface shape of the shell 3. The structure that matches the shell opening of the busbar 5 is the short side, and the structure that matches the inner top surface of the shell 3 is the long side. The short side is welded to the inner pole 6, and the long side is welded to the internal pole ear of the battery cell. This structure can ensure that in the battery manufacturing process, the inner pole 6 does not extend out of the shell opening in advance. After the welding connection between the short side and the inner pole 6 and the welding connection between the long side and the internal pole ear of the battery cell are all completed, the inner pole 6 is passed out from the inside of the shell 3 to facilitate the subsequent operation between the inner pole 6 and the outer pole 1.

[0035] Specifically, the top surface of the inner pole 6 has a recessed portion on its periphery, and the inner periphery of the outer pole 1 has a protruding clamping portion, the recessed portion is clamped with the clamping portion, and the top surface of the inner pole 6 and the top surface of the outer pole 1 are configured to be flush and sealed and welded.

[0036] In addition, the cylindrical battery cover sealing assembly 10 of the disclosed embodiment further includes a spacer 4, which is sandwiched between the inner top surface of the shell 3 and the busbar 5, and the spacer 4 insulates the busbar 5 from the shell 3 inside the battery. Exemplarily, the spacer 4 has a sheet structure.

[0037] In addition, the embodiment of the present disclosure further provides a cylindrical battery, including the cylindrical battery cover sealing assembly 10, and also including: a battery cell accommodated in the shell 3, the battery cell including an internal tab of the battery cell, and the long side of the busbar 5 is welded to the internal tab of the battery cell. All the effects of the cylindrical battery cover sealing assembly 10 can be achieved, and no further description is given here.

[0038] In summary, the cylindrical battery upper cover sealing assembly 10 and the cylindrical battery of the embodiment of the present disclosure are adopted, and the outer pole 1 is approximately I-shaped, with a flat upper end and an oblique angle at the lower end. The shell opening of the battery shell 3 is at an upward inclination angle, and the insulating ring is fixed in accordance with the inclination angle of the shell opening. The sealing ring is stuck between the lower end oblique angle of the outer pole 1 and the shell opening, and is sealed in one piece by extrusion. The insulating ring acts as an insulator between the outer pole 1 and the shell 3. The isolation plate insulates the busbar 5 from the shell 3 inside the battery. The shape of the busbar 5 is shaped in accordance with the inclination of the shell opening, and the short side of the busbar 5 is connected to the inner pole 6 by laser welding. After the long side of the busbar 5 is connected to the internal ear of the battery cell by laser welding, the inner pole 6 is passed through the inside of the shell 3, and the upper end of the inner pole 6 is flush with the outer pole 1 for laser sealing welding.

[0039] The shell 3 is designed with an upward bevel, and the outer pole 1, the sealing ring and the shell opening are extruded and sealed in one piece, which saves the space inside the shell 3 to the maximum extent and can effectively improve the energy density of the battery. In addition, the busbar 5 is designed with the same shape as the shell opening, so as to save a trapezoidal space to the maximum extent, provide more space for storing electrolyte in the battery, and make the battery have a longer service life.

[0040] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A cylindrical battery upper cover sealing assembly, characterized in that: include: A shell (3), the shell (3) having a shell opening, the shell opening having a cross section presenting a first inclined surface and extending away from the inner cavity of the shell (3); A pole assembly, the pole assembly comprising an inner pole (6) and an outer pole (1) wrapped around the outer periphery of the inner pole (6), the outer pole (1) having a second inclined surface parallel to and matching the first inclined surface; the first inclined surface extends into the shell opening, and at least a portion of the structure of the outer pole (1) is covered above the shell opening; A sealing member (7), wherein the sealing member (7) is configured to be squeezed and sealed between the first inclined surface and the second inclined surface.

2. The cylindrical battery upper cover sealing assembly according to claim 1, characterized in that: The shell opening, the outer pole (1) and the sealing member (7) are integrally formed.

3. The cylindrical battery upper cover sealing assembly according to claim 2, characterized in that: The cylindrical battery upper cover sealing assembly (10) further comprises an insulating member (2), wherein the insulating member (2) is isolated between the outer pole (1) and the shell opening along the longitudinal direction.

4. The cylindrical battery upper cover sealing assembly according to claim 3, characterized in that: The outer pole (1) also has a first planar main body and a connecting portion connected to the first planar main body and extending along the longitudinal direction toward the inner cavity of the shell (3), an acute angle is formed between the first planar main body, the connecting portion and the second inclined surface, and the insulating member (2), the shell opening and the sealing member (7) are squeezed and sealed at the acute angle.

5. The cylindrical battery upper cover sealing assembly according to claim 4, characterized in that: The outer pole (1), the sealing member (7) and the shell opening are configured as an extruded integrally formed sealing structure.

6. The cylindrical battery upper cover sealing assembly according to claim 5, characterized in that: The cylindrical battery upper cover sealing assembly (10) further comprises a busbar (5), wherein the busbar (5) is constructed to be an irregular shape matching the shell opening and the inner top surface of the shell (3), wherein the structure of the busbar (5) matching the shell opening is a short side portion, and the structure of the busbar (5) matching the inner top surface of the shell (3) is a long side portion, wherein the short side portion is welded to the inner pole (6), and the long side portion is welded to the inner pole ear of the battery cell.

7. The cylindrical battery upper cover sealing assembly according to claim 6, characterized in that: The cylindrical battery upper cover sealing assembly (10) further comprises an isolating member (4), wherein the isolating member (4) is sandwiched between the inner top surface of the shell (3) and the busbar (5).

8. The cylindrical battery upper cover sealing assembly according to claim 6, characterized in that: The top surface of the inner pole (6) has a recessed portion on its outer periphery, and the inner periphery of the outer pole (1) has a protruding clamping portion, the recessed portion is clamped with the clamping portion, and the top surface of the inner pole (6) and the top surface of the outer pole (1) are configured to be flush and sealed welded.

9. The cylindrical battery upper cover sealing assembly according to claim 6, characterized in that: The shell opening cross section is a trapezoidal structure with a longitudinal opening.

10. A cylindrical battery, characterized in that: It comprises a cylindrical battery cover sealing assembly (10) as described in any one of claims 6 to 9, and also comprises: a battery cell accommodated in the shell (3), the battery cell comprising an internal tab of the battery cell, and the long side of the busbar (5) is welded to the internal tab of the battery cell.

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