CN221041452U

CN221041452U - Metal connecting sheet for resistance welding

Info

Publication number: CN221041452U
Application number: CN202322330452.3U
Authority: CN
Inventors: 吴彬
Original assignee: Suzhou New Power Energy Co ltd
Current assignee: Suzhou New Power Energy Co ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2024-05-28
Anticipated expiration: 2033-08-29

Abstract

The utility model relates to a metal connecting sheet for resistance welding, which comprises a connecting sheet body, wherein a plurality of welding positions corresponding to electric cores are arranged on the connecting sheet, each welding position comprises a first shunting hole and a second shunting hole, the first shunting hole is of a rectangular structure, the second shunting holes are arranged at two ends of the first shunting hole and are axisymmetrically arranged, each second shunting hole is of a circular arc structure, the opening of each second shunting hole faces the direction of the corresponding second shunting hole, welding areas are arranged at two sides of each first shunting hole, and welding salient points which are in contact with the end surfaces of the electric cores are arranged at the welding areas; when the current flows from the positive electrode to the negative electrode of the welding electrode, the path passing through the surface of the upper workpiece is long, so that most of the current is forced to flow through the lower workpiece from the upper workpiece to form effective current, and heat is accumulated at the position with the largest contact resistance (the welding salient point) to form welding, thereby avoiding the instability of contact resistance caused by the metal tension of the upper workpiece and stably and effectively welding the upper workpiece and the lower workpiece together.

Description

Metal connecting sheet for resistance welding

Technical Field

The present utility model relates to lithium batteries, and more particularly to a metal connecting sheet for resistance welding.

Background

At present, a battery core in the new energy industry of the battery is connected with the battery core, and a common mode for connecting the battery core and a battery protection system adopts resistance welding nickel plates, steel nickel plates, alloy copper materials and the like for connection. The resistance welding is a connecting process that a welding core is formed by heating and melting the welding needle and the battery core through the contact impedance of 2 welding materials by adopting direct current instantaneous (millisecond level) high current (kiloampere level), and as the welding current flowing through the welding needle and the battery core from the welding needle is effective current and the current flowing through the welding needle on the connecting sheet is ineffective current during the spot welding of the connecting sheet, the connecting sheet is provided with a diversion hole, such as patent CN 208738341 and CN 209963136, the diversion hole mainly has the effect of increasing the distance of the current passing through the nickel sheet, but the prior art has the problem that after the diversion hole is arranged, the welding area is always arranged at two sides of the diversion hole, and as the contact impedance of the traditional resistance welding is the lower pressure of two electrodes by a spring, the welding core is formed by pressing the upper workpiece (welding area) and the lower workpiece (battery shell) together, and the heat is accumulated at the position with the maximum pressure, the tension of the welding area plus the instability of the spring pressure causes the value of the contact impedance of each time to be greatly changed, and the welding quality is unstable.

Disclosure of utility model

The utility model aims to provide a metal connecting sheet for resistance welding, which solves the problem of unstable welding quality of the existing connecting sheet.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The utility model provides a metal connecting sheet for resistance welding, which is provided with a plurality of welding positions corresponding to a battery cell, wherein each welding position comprises a first shunting hole and a second shunting hole, the first shunting hole is of a rectangular structure, the second shunting holes are arranged at two ends of the first shunting hole and are in axisymmetric arrangement, each second shunting hole is of a circular arc structure, an opening of each second shunting hole faces to the direction of the corresponding second shunting hole, welding areas are arranged at two sides of each first shunting hole, and welding salient points which are in contact with the end face of the battery cell are arranged on each welding area.

Preferably, each welding area is provided with two welding convex points, and in a welding state, the two welding convex points of each welding area correspond to the same electrode.

Preferably, the welding areas are bowl-shaped structures, and the welding areas on two sides are also axisymmetrically arranged.

Preferably, the thickness of the connecting sheet body is 0.1 mm-0.2 mm.

Preferably, the width range of the first diversion hole is 1.7 mm-2.0 mm, and the length range is 7.5 mm-9.5 mm.

Preferably, the width of the second diversion hole ranges from 0.85mm to 1.25mm, and the length of the second diversion hole ranges from 8.5mm to 10.5mm.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

The metal connecting sheet for resistance welding is provided with the two shunt holes, when current flows from the positive electrode to the negative electrode of the welding electrode, the path passing through the surface of the upper workpiece is long, most of the current is forced to flow through the lower workpiece from the upper workpiece to form effective current, heat is accumulated at the position with the largest contact resistance to form welding, meanwhile, the welding convex point faces to the lower workpiece, obvious effective contact resistance is formed at the convex point when the upper workpiece and the lower workpiece are pressed, and the instability of the contact resistance caused by the metal tension of the upper workpiece is avoided. The current gathers heat through bump department and forms the seam, can be stable effectual upper and lower work piece welding together.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a state diagram of the use of an embodiment of the present utility model;

fig. 3 is a schematic view of the welding state of the present utility model.

Wherein reference numerals are as follows:

1. A connecting piece body;

21. a first tap hole; 22. a second diversion aperture;

3. a welding area; 31. welding the convex points;

4. A connection contact;

5. a battery cell; 6. a positive electrode; 7. and a negative electrode.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present embodiment, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in fig. 1 and 2, the present example includes a connecting piece body 1, a plurality of welding positions corresponding to the electric core 5 are provided on the connecting piece, the distance between the welding positions depends on the distance between the electric core 5, the welding positions include a first tapping hole 21 and a second tapping hole 22, the first tapping hole 21 is rectangular structure, the second tapping hole 22 is provided at two ends of the first tapping hole 21, the first tapping hole 21 corresponds to the center position of the second tapping hole 22, the second tapping holes at two ends are axisymmetrically provided, the two sides of the first tapping hole 21 are provided with welding areas 3, the welding areas 3 are provided with welding bumps 31 contacting with the end face of the electric core 5, the welding areas 3 at two sides correspond to different electrodes respectively due to the arrangement of the tapping holes, so that when current flows from the positive electrode to the negative electrode during welding, the arrangement of the first tapping hole 21 is difficult to pass through the surface of the upper workpiece directly, but the second tapping hole 22 is circular arc structure, the opening of the second tapping hole faces the direction of the second tapping hole, the path is longer, the current flowing from the upper workpiece to the lower workpiece is forced to flow through the largest part to form maximum contact resistance, and the welding areas are in close contact with each welding area is formed.

In other embodiments, one welding bump may be used for each welding area 3, and in the welding state, the two welding bumps 31 of each welding area 3 correspond to the same electrode, and assuming that the two welding bumps 31 of the left welding area 3 contact the positive electrode 6 at the same time, the two welding bumps 31 of the right welding area 3 contact the negative electrode 7 at the same time, because of unidirectional current, a false welding condition may occur in one pair of welding bumps 31, and the other pair can ensure normal connection between the battery cell 5 and the connecting piece, so as to prevent a problem of incomplete connection. However, if multiple bumps are provided, this may cause shunting such that each solder joint is not soldered in place, or a larger size of the solder electrode is required.

The second shunt hole 22 must have a length greater than the width of the first shunt hole 21 so that as much current as possible can pass through the cell 5 housing to the solder bump 31 rather than through the second shunt hole 22 bypassing the tab body 1. But the size is not easy to be oversized, otherwise, the occupied area of each welding position is oversized, the whole strength of the connecting sheet is enabled to be low, the current load capacity of the nickel sheet is reduced, the width range of the first flow dividing hole is 1.7 mm-2.0 mm, the length range is 7.5 mm-9.5 mm, the width range of the second flow dividing hole is 0.85 mm-1.25 mm, and the length range is 8.5 mm-10.5 mm.

The welding area 3 is bowl-shaped structure, and extends to the connection piece below, and the up end of welding area 3 is less than the up end of connection piece body 1, and the welding area 3 of both sides also is axisymmetric setting, and welding bump 31 hugs closely the edge setting of welding area 3, is close to bowl-shaped structure's longest limit, and the electrode is pressed and is covered in welding area 3 when welding, sets up to bowl-shaped structure, and the area is great like this, firstly guarantees the joint strength of welding area 3 territory and connection piece, secondly improves with the area of contact of electric core 5 for the welding is more convenient.

When the electric welding device is specifically used, the connecting piece body 1 is arranged corresponding to one electric core 5 group, the connecting contact 4 is arranged on the connecting piece body 1, the connection of a plurality of electric core 5 groups is realized through the connecting contact 4, each welding position corresponds to one electric core 5, as shown in fig. 3, then the positive electrode 6 and the negative electrode 7 are simultaneously used to be respectively pressed on the welding areas 3 on the two sides, current can flow into the negative electrode side from the positive electrode side through the shell of the electric core 5, and due to the existence of the welding salient point 31, heat is accumulated at the welding salient point 31 to form a welding joint, and the upper workpiece and the lower workpiece can be stably and effectively welded together.

The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a metal connecting piece for resistance welding, includes the connection piece body, its characterized in that, be provided with the welding position of a plurality of corresponding electric core on the connection piece, the welding position includes first reposition of redundant personnel hole and second reposition of redundant personnel hole, first reposition of redundant personnel hole is rectangular structure, the second reposition of redundant personnel hole sets up at first reposition of redundant personnel hole both ends and is axisymmetric setting, the second reposition of redundant personnel hole is convex structure, the opening in second reposition of redundant personnel hole is towards second reposition of redundant personnel hole place direction, the both sides in first reposition of redundant personnel hole all are provided with the welded zone, the welded zone is provided with the welding bump that contacts with the electric core terminal surface, the welded zone just extends to the connection piece below, the up end of welded zone is less than connection piece upper body terminal surface.

2. A metal connecting sheet for resistance welding according to claim 1, wherein: and two welding convex points are arranged on each welding area, and in a welding state, the two welding convex points of each welding area correspond to the same electrode.

3. A metal connecting sheet for resistance welding according to claim 1, wherein: the welding areas are bowl-shaped structures, and the welding areas on two sides are also axisymmetrically arranged.

4. A metal connecting sheet for resistance welding according to claim 1, wherein: the thickness of the connecting sheet body is 0.1 mm-0.2 mm.

5. A metal connecting sheet for resistance welding according to claim 1, wherein: the width range of the first diversion hole is 1.7 mm-2.0mm, and the length range is 7.5 mm-9.5 mm.

6. A metal connecting sheet for resistance welding according to claim 1, wherein: the width range of the second diversion hole is 0.85 mm-1.25 mm, and the length range is 8.5 mm-10.5 mm.