Battery cover plate, battery with battery cover plate and welding head with battery cover plate

Abstract

The utility model discloses a battery cover plate, a battery with the battery cover plate and a welding head with the battery cover plate. The battery cover plate comprises a cover plate body and a sealing element, the cover plate body is provided with an outer side face facing the outer side and an inner side face facing the inner side, the outer side face is provided with a first groove sinking towards the inner side, the bottom face of the first groove is provided with a through hole penetrating through the cover plate body, and the first groove and the through hole jointly define a liquid injection hole. The sealing piece is arranged in the first groove, partially extends into the through hole, and is fixed to an opening, facing the outer side, of the through hole through electric resistance welding so as to seal the through hole. The sealing element is fixed at the through hole in an electric resistance welding manner, so that the overall sealing performance of the sealed battery can be effectively ensured, meanwhile, the assembly efficiency is improved, and the assembly difficulty and the production cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover plate and a battery and a welding head having the same. Background Art

[0002] In the prior art, the main methods for sealing the liquid injection hole of a square aluminum shell lithium battery include interference fit between a steel ball and the liquid injection hole, and welding and sealing the liquid injection port cover plate and the liquid injection port. Among them, the interference fit method between the steel ball and the liquid injection hole has the problem that the steel ball is easily displaced and falls into the battery, and the welding and sealing method between the liquid injection port cover plate and the liquid injection port has the problem of complex procedures and high production costs. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cover plate with good sealing effect and simple process.

[0004] According to the embodiment of the utility model, the battery cover includes: a cover body and a sealing member; the cover body has an outer side surface facing outward and an inner side surface facing inward, the outer side surface has a first groove recessed toward the inside, the bottom surface of the first groove has a through hole penetrating the cover body, and the first groove and the through hole jointly define a liquid injection hole; the sealing member is arranged in the first groove and partially extends into the through hole, and the sealing member is fixed to the opening of the through hole facing outward by resistance welding to seal the through hole.

[0005] According to the battery cover plate of the embodiment of the utility model, by fixing the sealing member at the through hole by resistance welding, the sealing of the entire battery can be effectively ensured, while the assembly efficiency is improved and the assembly difficulty and production cost are reduced.

[0006] In addition, the battery cover according to the utility model may also have the following additional technical features:

[0007] In some embodiments, the seal is a spherical steel ball.

[0008] In some embodiments, the bottom surface of the first groove is a plane perpendicular to the straight line of the thickness direction of the cover body, and the through hole extends along the thickness direction of the cover body so that the bottom surface of the first groove and the hole wall of the through hole are perpendicular to each other and form a right angle position, and the steel ball abuts against the right angle position.

[0009] In some embodiments, in a projection plane perpendicular to the thickness direction of the cover body, the projections of the first groove and the through hole are both circular, the diameter of the first groove is larger than the diameter of the steel ball, and the diameter of the steel ball is larger than the diameter of the through hole.

[0010] In some embodiments, the angle a between the tangent line of any point where the steel ball contacts the right-angle position and the hole wall of the through hole satisfies: 10°≤a≤60°.

[0011] In some embodiments, the portion of the seal located in the through hole is the first portion, and the portion of the seal located in the first groove is the second portion. In the thickness direction of the cover body, the depth of the first groove is greater than or equal to the thickness of the seal.

[0012] In some embodiments, in a direction from the outer side surface to the inner side surface, a sidewall of the first groove is inclined toward a central area of ​​the first groove.

[0013] The utility model also provides a battery having the above embodiment.

[0014] According to the battery of the embodiment of the utility model, by providing the battery cover of the above embodiment, the sealing performance and safety performance of the battery as a whole can be effectively improved. At the same time, the assembly difficulty and production cost of the battery can be reduced, and the production efficiency of the battery can be improved.

[0015] The utility model also provides a welding head used for the battery cover plate of the above embodiment.

[0016] According to the welding head of the embodiment of the utility model, the end surface of the welding head facing the seal has a groove matching the shape of the seal. Such a design not only facilitates the cooperation between the welding head and the seal and improves the welding efficiency, but also ensures the stability during welding and prevents the seal from being displaced during welding.

[0017] In some embodiments, when the groove is matched with the sealing member, the distance b between the end surface of the welding head and the bottom surface of the first groove satisfies: 0.5 mm≤b≤1 mm.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a top view of a battery cover according to an embodiment of the utility model;

[0020] Figure 2 is based on Figure 1 The cross-sectional view of line AA in the figure;

[0021] Figure 3 is based on Figure 2 Magnified view of area B in FIG.

[0022] Reference numerals:

[0023] 100. Battery cover;

[0024] 1. Cover plate body; 11. First groove; 12. Through hole;

[0025] 2. Sealing member; 21. First part; 22. Second part;

[0026] 3. Right angle position;

[0027] 4. Welding head; 41. Groove. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference below Figure 1-Figure 3 A battery cover 100 according to an embodiment of the present invention is described.

[0033] like Figures 1 to 3 As shown, according to an embodiment of the utility model, the battery cover 100 includes: a cover body 1 and a sealing member 2; the cover body 1 has an outer side surface facing outward and an inner side surface facing inward, the outer side surface has a first groove 11 recessed toward the inside, the bottom surface of the first groove 11 has a through hole 12 penetrating the cover body 1, and the first groove 11 and the through hole 12 jointly define a liquid injection hole; the sealing member 2 is arranged in the first groove 11 and partially extends into the through hole 12, and the sealing member 2 is fixed to the opening of the through hole 12 facing outward by resistance welding to seal the through hole 12.

[0034] In this embodiment, the seal 2 is fixed at the through hole 12 by resistance welding, which not only ensures the reliability of the seal, but also has a simple process, high assembly efficiency and low production cost; the first groove 11 can play an auxiliary positioning role to facilitate assembly, and at the same time, it can also prevent the molten metal from splashing to the outside during welding.

[0035] According to the battery cover 100 of the embodiment of the utility model, by fixing the seal 2 at the through hole 12 by resistance welding, the overall sealing of the battery can be effectively ensured, while the assembly efficiency is improved and the assembly difficulty and production cost are reduced.

[0036] In some embodiments, for example Figure 3 As shown, the seal 2 is a spherical steel ball, and the diameter of the steel ball is R, which satisfies: 1.5mm≤R≤6mm. When the diameter R of the steel ball is less than 1.5mm, the steel ball is too small to fit the liquid injection port. When the diameter R of the steel ball is greater than 6mm, the steel ball is too large, which not only increases the weight of the battery cover 100 as a whole and increases the production cost, but also easily interferes with surrounding components.

[0037] In a specific embodiment of the present invention, Figures 1 to 3 As shown, the bottom surface of the first groove 11 is a plane perpendicular to the straight line of the thickness direction of the cover body 1, and the through hole 12 extends along the thickness direction of the cover body 1, so that the bottom surface of the first groove 11 and the hole wall of the through hole 12 are perpendicular, and a right-angle position 3 is constructed, and the steel ball abuts against the right-angle position 3, so that the steel ball can be effectively supported to prevent the steel ball from being displaced during the welding process and causing the problem of sealing failure.

[0038] In a specific embodiment of the present invention, Figures 1 to 3As shown, in the projection plane perpendicular to the thickness direction of the cover body 1, the projections of the first groove 11 and the through hole 12 are both circular, the diameter of the first groove 11 is larger than the diameter of the steel ball, and the diameter of the steel ball is larger than the diameter of the through hole 12, so as to increase the contact area between the steel ball and the right-angle position 3. In this way, the direct contact area between the steel ball and the right-angle position 3 can be increased, thereby improving the sealing effect after the steel ball is welded.

[0039] In a specific embodiment of the present invention, Figures 1 to 3 As shown, the angle a between the tangent of any point where the steel ball contacts the right-angle position 3 and the hole wall of the through hole 12 satisfies: 10°≤a≤60°. In this specific embodiment, when the angle a between the tangent of any point where the steel ball contacts the right-angle position 3 and the hole wall of the through hole 12 is less than 10°, the steel ball is easy to fall into the battery, causing sealing failure; when the angle a between the tangent of any point where the steel ball contacts the right-angle position 3 and the hole wall of the through hole 12 is greater than 60°, the molten metal is easy to splash into the battery during welding, causing damage to the battery; when the angle a between the tangent of any point where the steel ball contacts the right-angle position 3 and the hole wall of the through hole 12 is greater than or equal to 10°, and less than or equal to 60°, the safety and reliability of the welding of the steel ball can be guaranteed.

[0040] In one embodiment of the present invention, Figures 1 to 3 As shown, the portion of the seal 2 located in the through hole 12 is the first portion 21, and the portion of the seal 2 located in the first groove 11 is the second portion 22. In the thickness direction of the cover body 1, the groove depth of the first groove 11 is greater than or equal to the thickness of the seal 2. Figure 3 As shown, the top of the steel ball does not exceed the upper surface of the first groove 11, so that the steel ball can be accommodated in the first groove 11, which can ensure the overall neatness of the battery. At the same time, the first groove 11 can also protect the steel ball and prevent it from being impacted.

[0041] In one embodiment of the present invention, Figures 1 to 3 As shown, in the direction from the outer side surface to the inner side surface, the side wall of the first groove 11 is inclined toward the central area of ​​the first groove 11, so that it is convenient for the assembly of the steel ball and can also play a guiding and positioning role in the assembly of the steel ball.

[0042] The utility model also provides a battery having the above embodiment.

[0043] According to the battery of the embodiment of the utility model, by providing the battery cover 100 of the above embodiment, the sealing performance and safety performance of the battery as a whole can be effectively improved. At the same time, the assembly difficulty and production cost of the battery can be reduced, and the production efficiency of the battery can be improved.

[0044] The present invention also provides a welding head 4 used for the battery cover 100 of the above embodiment.

[0045] According to the welding head 4 of the embodiment of the utility model, the end surface of the welding head 4 facing the sealing member 2 has a groove 41 matching the shape of the sealing member 2. Such a design not only facilitates the cooperation between the welding head 4 and the sealing member 2 and improves the welding efficiency, but also ensures the stability during welding and prevents the sealing member 2 from being displaced during welding.

[0046] In one embodiment of the present invention, Figures 1 to 3 As shown, when the groove 41 is matched with the sealing member 2, the distance b between the end face of the welding head 4 and the bottom surface of the first groove 11 satisfies: 0.5mm≤b≤1mm. In this embodiment, when the distance b between the end face of the welding head 4 and the bottom surface of the first groove 11 is less than 0.5mm, the welding head 4 is too close to the bottom surface of the first groove 11, and the welding head 4 is easy to contact with the molten metal during welding; when the distance b between the end face of the welding head 4 and the bottom surface of the first groove 11 is greater than 1mm, the welding head 4 is too far from the bottom surface of the first groove 11, and the cooperation between the welding head 4 and the steel ball is unstable during welding, and the welding head 4 and the steel ball are easy to separate, and the welding effect cannot be effectively guaranteed. When the distance b between the end face of the welding head 4 and the bottom surface of the first groove 11 is greater than or equal to 0.5mm, and less than or equal to 1mm, the normal operation of the welding head 4 can be guaranteed.

[0047] Other structures and operations of the battery cover 100, the battery and the welding head 4 according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cover, characterized in that: include: A cover plate body, the cover plate body having an outer side surface facing outward and an inner side surface facing inward, the outer side surface having a first groove recessed inward, the bottom surface of the first groove having a through hole penetrating the cover plate body, the first groove and the through hole jointly defining a liquid injection hole; A sealing member is disposed in the first groove and partially extends into the through hole. The sealing member is fixed to the opening of the through hole toward the outside by resistance welding to seal the through hole.

2. The battery cover according to claim 1, characterized in that: The sealing element is a spherical steel ball.

3. The battery cover according to claim 2, characterized in that: The bottom surface of the first groove is a plane perpendicular to the straight line of the thickness direction of the cover body, and the through hole extends along the thickness direction of the cover body so that the bottom surface of the first groove and the hole wall of the through hole are perpendicular to each other and form a right angle position, and the steel ball abuts against the right angle position.

4. The battery cover according to claim 3, characterized in that: In a projection plane perpendicular to the thickness direction of the cover plate body, projections of the first groove and the through hole are both circular, the diameter of the first groove is larger than the diameter of the steel ball, and the diameter of the steel ball is larger than the diameter of the through hole.

5. The battery cover according to claim 3 or 4, characterized in that: The angle a between the tangent line of any point where the steel ball contacts the right-angle position and the hole wall of the through hole satisfies: 10°≤a≤60°.

6. The battery cover according to claim 1, characterized in that: The portion of the seal located in the through hole is the first portion, and the portion of the seal located in the first groove is the second portion. In the thickness direction of the cover body, the groove depth of the first groove is greater than or equal to the thickness of the seal.

7. The battery cover according to claim 1, characterized in that: In a direction from the outer side surface to the inner side surface, a side wall of the first groove is inclined toward a central area of ​​the first groove.

8. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 7.

9. A welding head, used for the battery cover according to any one of claims 1 to 7, characterized in that: The end surface of the welding head facing the sealing member has a groove matching the shape of the sealing member.

10. The welding head according to claim 9, characterized in that: When the groove is matched with the sealing member, a distance b between the end surface of the welding head and the bottom surface of the first groove satisfies: 0.5 mm≤b≤1 mm.

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