CN215280338U

CN215280338U - Spot welding structure and battery

Info

Publication number: CN215280338U
Application number: CN202120890743.6U
Authority: CN
Inventors: 覃定员; 徐江涛; 黑小斌; 曹春; 陈志勇
Original assignee: Guangdong Mic Power New Energy Co Ltd
Current assignee: Guangdong Mic Power New Energy Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-12-24
Anticipated expiration: 2031-04-28

Abstract

The utility model discloses a spot welding structure, including inside welding needle and hollow outside welding needle, outside welding needle cover is established outside inside welding needle and has the clearance between outside welding needle and the inside welding needle, the lower of outside welding needle bottom welding end is in same height with the lower of inside welding needle bottom welding end. Because the inside welding pin and the outside welding pin of bottom welding end in same height of adoption, inside welding pin and outside welding pin contact battery steel casing simultaneously and weld during the welding, and welding speed is fast, and overall structure is simple durable simultaneously. This practicality can contact the box hat of battery simultaneously when the welding, once alright accomplish the welding, the flexible and rotatory welding mode that prior art adopted, welding speed is faster, and efficiency is higher. Additionally the utility model also discloses a battery adopts and welds structure matched with box hat, fastness when improving the welding.

Description

Spot welding structure and battery

Technical Field

The utility model relates to a welding and battery field specifically are a spot welding structure and battery.

Background

The spot welding is a key technology in the manufacturing process of the battery, in particular to a steel shell battery (a cylindrical battery or a button battery), which is used for connecting a pole lug with a steel shell, the pole lug with a foil, the steel shell with a nickel sheet and other conductive materials. For a button cell, spot welding is basically completed by clamping a weldment by positive and negative welding electrodes, and for a laminated cell or a winding cell with a small winding needle, generally speaking, a tab is welded on a steel shell, and then the cell is placed in the steel shell, so that the operation is very inconvenient; meanwhile, under the condition that the battery core lug is welded from the outside, the battery core lug is inclined, and the like, so that the battery core lug cannot be identified from the outside or is difficult to identify from the outside, and the cold joint or the over-welding is easy to cause during welding.

In order to improve the effect of external welding, chinese patent application No. CN201521140984X discloses a combined spot-bottom welding pin, which adopts a cylindrical external welding pin and an internal welding pin arranged in the external welding pin, and can perform multiple spot welding simultaneously when in use, thereby improving the welding effect. The inside welding needle passes through rotary device and telescoping device and is connected with the button in this structure, presses the inside welding needle of button during the use and stretches out and draws back and rotate, combines to accomplish once to a lot of welding with outside welding needle again, because inside welding needle need stretch out and draw back and rotate, leads to welding speed slower, and efficiency is lower, and this structure is complicated simultaneously, breaks down relatively easily, influences welding efficiency.

Disclosure of Invention

For solving the problem that prior art exists, the utility model provides a spot welding structure that simple structure, welding efficiency are high.

The utility model provides a spot welding structure, includes inside welding needle and hollow outside welding needle, outside welding needle cover is established outside inside welding needle and has the clearance between outside welding needle and the inside welding needle, the lowest of outside welding needle bottom weld end is in same height with the lowest of inside welding needle bottom weld end. Because the inside welding pin and the outside welding pin of bottom welding end in same height of adoption, inside welding pin and outside welding pin contact battery steel casing simultaneously and weld during the welding, and welding speed is fast, and overall structure is simple durable simultaneously.

According to the further improved technical scheme, an insulating layer is arranged on the outer surface of the inner welding pin and/or the inner surface of the outer welding pin, or an insulating material is filled in a gap between the outer welding pin and the inner welding pin. Set up insulating layer or insulating material, improve the insulating nature between outside welding needle and the inside welding needle, prevent that the touching from switching on, improve the security.

According to the further improved technical scheme, the outer contour of the cross section of the external welding pin perpendicular to the axial direction is circular, D-shaped or regular polygon. The shapes have simple structure, are convenient to process, and are internally convenient to process to form a hollow structure.

According to the further improved technical scheme, the bottom welding end of the external welding pin is a plane or a cambered surface or is wavy or zigzag. The plane or the cambered surface can enable the whole contact surface to be welded and formed, and the wavy or zigzag welding can enable a plurality of points to be welded, so that a better welding and fixing effect can be realized.

According to the further improved technical scheme, the bottom welding end of the inner welding pin is a plane or an arc surface. The plane or cambered surface structure can achieve a better welding effect.

The improved technical scheme further comprises a first chuck and a second chuck, wherein the first chuck and the second chuck are respectively used for clamping the inner welding pin and the outer welding pin. The inner welding needle and the outer welding needle can be fixed more firmly, and the first chuck and the second chuck are convenient to be connected with a welding machine.

According to the further improved technical scheme, the external welding needle and the second chuck are in detachable fixed connection or an integrated structure. Both structures enable good fixation of the external welding pin.

According to a further improved technical scheme, the outer welding pin and the inner welding pin are components made of the same material. The same material has the same welding performance, and is convenient for achieving a welding effect with better consistency.

According to the further improved technical scheme, the outer welding pin and the inner welding pin are made of one of copper alloy, tungsten copper and tungsten steel. The materials have better welding effect in welding.

The utility model also discloses a battery, including the box hat with locate the inside utmost point ear box hat of box hat the surface is equipped with to sunken first sunken and the second sunken inside, first sunken and the second sunken cooperate with the bottom weld end of the inside welding needle of foretell spot welding structure and outside welding needle respectively, the surface of utmost point ear all with the first sunken and the sunken interior surface's of second bulge contact. Through set up first sunken and the second sunken on the box hat, simultaneously the first sunken and the sunken surperficial protruding department of the sunken internal surface of second and the surface contact of utmost point ear, when the welding, inside welding needle and outside welding needle are sunken the cooperation with first sunken and second respectively, make protruding department melting and utmost point ear surface more firm fixed, improve the welding effect.

The utility model discloses an adopt bottom weld end to be in inside welding needle and the outside welding needle of same height, can contact the steel casing of battery simultaneously when the welding, once alright accomplish the welding, flexible and rotatory welding mode that relative prior art adopted, welding speed is faster, and efficiency is higher, and overall structure is also more simple.

Drawings

Fig. 1 is a schematic view of a spot welding structure and a battery structure of the present invention;

fig. 2 is a schematic diagram of a partial spot welding structure and a battery structure according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

In a preferred embodiment, referring to fig. 1 and 2, the spot welding structure includes an inner pin 1 and a hollow outer pin 2, wherein the outer pin 2 is sleeved outside the inner pin 1, and a gap is formed between the outer pin 2 and the inner pin 1, and a lowest point of a bottom welding end of the outer pin 2 is at the same height as a lowest point of a bottom welding end of the inner pin 1. In practical structures, the lowest point may be a plane, or a line, or several points, and the planes of the outer pin 2 and the inner pin 1 are at the same height, or the plane of the line is at the same height, or the planes of the several points are at the same height.

Because outside welding needle 2 and inside welding needle 1 between have the clearance, contactless between the two, have insulating effect, but the contact of rocking probably appears in the use, or electric breakdown air appears, all can damage the welding needle, influence normal use, so for improving insulating effect, set up insulating layer 3 on the surface of inside welding needle 1 and/or the internal surface of outside welding needle 2, also can fill in the clearance department between outside welding needle 2 and inside welding needle 1 with insulating material, can refer to fig. 2 specifically. Wherein set up insulating layer 3, be fixed on the surface of inside welding needle 1 and/or the internal surface of outside welding needle 2, and filling insulating material then can be connected outside welding needle 2 and inside welding needle 1 together, or cover filling material exists relatively independently, all can play the effect that improves insulating effect.

Further, the external welding needle 2 is improved, and in the external shape structure, the external profile of the cross section perpendicular to the axial direction is circular, D-shaped or regular polygon. The shape structures are simple, the processing is convenient, the welding ends with different shapes are arranged at the bottom of the base, the improvement is convenient, and the specific structure of the welding end can be a plane or a cambered surface or a wavy or zigzag structure. When the plane or the cambered surface is welded, the whole contact surface can be welded, and the wavy or zigzag welding structure is wavy or zigzag, so that the welding fixing purpose can be achieved due to the fact that only part of the contact surface is contacted and the welding is performed by spot welding at multiple positions. In addition, also can improve the welding end to the inside welding needle 1 bottom, make it reach better welding effect, because the volume of inside welding needle 1 bottom is less, so concrete can set up the bottom welding end of inside welding needle 1 into plane or cambered surface, this simple structure conveniently processes, and its welding effect is also preferred.

Referring to fig. 1, in order to improve the fixing effect of the inner and

outer pins

1 and 2, the inner and

outer pins

1 and 2 are held by first and second chucks 4 and 5, respectively. In the structure, adopt first chuck 4 and the convenient fixed connection of second chuck 5 on the welding machine, fixed back simultaneously, can be more firm press from both sides tightly fixed with inside welding needle 1 and outside welding needle 2 respectively, make both difficult appearances rock and touch. In addition, the second chuck 5 and the external welding pin 2 can be fixedly connected by adopting a bolt in a detachable way, so that the external welding pin 2 is convenient to replace; or the second chuck 5 and the outer welding needle 2 adopt an integrated structure, so that the outer welding needle 2 can be more firmly fixed.

Furthermore, in the above embodiment, the external welding pin 2 and the internal welding pin 1 are made of the same material, and are made of one of copper alloy, tungsten copper and tungsten steel, and the materials can weld the battery steel shell and the tab well.

The utility model also discloses a battery, including 6 utmost point ears 7 of box hat, wherein utmost point ear 7 is located inside 6 of box hat, be equipped with inside recessed first sunken 61 and second sunken 62 at the surface of box hat 6, this first sunken 61 and second sunken 62 cooperate with the bottom welding end of inside welding needle 1 and outside welding needle 2 in the above-mentioned spot welding structure respectively, through setting up first sunken 61 and second sunken 62, can improve the cooperation nature of box hat 6 and welding needle when welding, thereby improve and weld the fastness, improve and weld the quality; in practice, the shape of the first and second recesses 61, 62 is either wavy or serrated, as mentioned above, in a plane or arc, matching the shape of the inner and

outer pins

1, 2. In addition, in the structure, the surfaces of the steel shell 6 and the electrode lug 7 are in contact with the convex parts of the inner surfaces of the first concave 61 and the second concave 62, so that the steel shell and the second concave can be in complete contact during welding, the steel shell and the second concave can be firmly fixed after welding, and the welding effect is improved.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "arranged" are to be construed broadly and may include, for example, arranged connections, detachable connections, or integral connections; they may be mechanically coupled, directly coupled, or indirectly coupled through intervening agents, both internally and/or in any other manner known to those skilled in the art. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims

1. A spot welding structure includes an inner welding pin (1) and a hollow outer welding pin (2), characterized in that: outside welding needle (2) cover is established outside inside welding needle (1) and has the clearance between outside welding needle (2) and inside welding needle (1), the lowest of outside welding needle (2) bottom weld end is in same height with the lowest of inside welding needle (1) bottom weld end.

2. A spot-welded structure according to claim 1, wherein: an insulating layer (3) is arranged on the outer surface of the inner welding needle (1) and/or the inner surface of the outer welding needle (2), or insulating materials are filled in a gap between the outer welding needle (2) and the inner welding needle (1).

3. A spot-welded structure according to claim 1, wherein: the outer contour of the cross section of the external welding needle (2) perpendicular to the axial direction is circular, D-shaped or regular polygon.

4. A spot-welded structure according to claim 1, wherein: the bottom welding end of the external welding needle (2) is a plane or a cambered surface or is wavy or zigzag.

5. A spot-welded structure according to claim 1, wherein: the bottom welding end of the inner welding needle (1) is a plane or an arc surface.

6. A spot-welded structure according to claim 1, wherein: the welding device is characterized by further comprising a first clamping head (4) and a second clamping head (5), wherein the first clamping head (4) and the second clamping head (5) are used for clamping the inner welding needle (1) and the outer welding needle (2) respectively.

7. A spot-welded structure according to claim 6, wherein: the external welding needle (2) and the second chuck (5) are in detachable fixed connection or in an integrated structure.

8. A spot-welded structure according to claim 1, wherein: the outer welding pin (2) and the inner welding pin (1) are components made of the same material.

9. A spot-welded structure according to claim 8, wherein: the outer welding needle (2) and the inner welding needle (1) are both one of copper alloy, tungsten copper and tungsten steel.

10. The utility model provides a battery, includes steel-shelled (6) and locates utmost point ear (7) of steel-shelled (6) inside, its characterized in that: the outer surface of the steel shell (6) is provided with a first recess (61) and a second recess (62) which are concave inwards, the first recess (61) and the second recess (62) are respectively matched with the bottom welding ends of the inner welding needle (1) and the outer welding needle (2) of the spot welding structure in any one of the preceding claims, and the surfaces of the tabs (7) are respectively contacted with the bulges on the inner surfaces of the first recess (61) and the second recess (62).