CN220863062U

CN220863062U - Welding head and welding device for pole lugs of battery pole pieces

Info

Publication number: CN220863062U
Application number: CN202322321585.4U
Authority: CN
Inventors: 郑明清
Original assignee: Zhejiang Liwei Energy Technology Co ltd
Current assignee: Zhejiang Liwei Energy Technology Co ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2024-04-30
Anticipated expiration: 2033-08-28

Abstract

The utility model discloses a welding head and a welding device for a pole lug of a battery pole piece, and relates to the technical field of welding equipment. In the technical scheme of the utility model, the welding teeth of the welding head are mutually attached, so that the welding length is reduced, the area of a welding area is reduced, more active substances can be coated on the pole piece, and the energy density of the battery is further improved. Meanwhile, the periphery of the welding part of the welding head is an arc surface, so that the pole piece is not easy to press and penetrate during welding, and the safety of welding the pole lugs is improved.

Description

Welding head and welding device for pole lugs of battery pole pieces

Technical Field

The utility model relates to the technical field of welding equipment, in particular to a welding head and a welding device for a pole lug of a battery pole piece.

Background

The battery comprises a pole piece and a pole lug, wherein the pole piece consists of a foil and active substances coated on the surface of the foil, and the more the active substances are, the higher the energy density of the battery is. In the production process, the tab is required to be welded on the pole piece, and the welding area on the pole piece has a great influence on the energy density of the battery.

At present, a welding head for welding a pole piece and a pole lug is usually a spot welding head, a plurality of welding teeth of the welding head are distributed, the welding length is larger, and the area of a welding area is increased, so that active substances on the pole piece are reduced, and the energy density of a battery is reduced. Meanwhile, the welding teeth of the welding head are sharp, the pole piece is easy to press and penetrate, internal short circuit of the battery is caused, and potential safety hazards exist.

Disclosure of utility model

The utility model provides a battery pole piece lug welding head, which aims to improve the energy density of a battery and the safety of lug welding.

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

The utility model provides a battery pole piece tab soldered connection, includes a plurality of welding teeth that are mutually pasted, a plurality of the top of welding tooth constitutes the welded part of soldered connection, the periphery of welded part is the cambered surface.

In some embodiments, the welding teeth are arranged in a tapered conical shape from bottom to top, and the periphery of the top of the welding teeth is a cambered surface.

In some embodiments, the taper is one of a polygonal taper, a conical taper, and an elliptical taper.

In some embodiments, the teeth are quadrangular pyramid shaped teeth, and a plurality of the teeth are distributed in a rectangular array.

In some embodiments, the bottom edges of two adjacent welding teeth are abutted against each other; or the bottom corners of two adjacent welding teeth are mutually abutted.

In some embodiments, the edges of the four-sided pyramid shaped weld teeth are provided with rounded transitions.

In some embodiments, the height of the weld teeth from bottom to top ranges from 0.1 to 0.3mm.

In some embodiments, the angle between two adjacent said teeth is in the range 75 ° -105 °.

In some embodiments, the welding head is an ultrasonic welding head.

The utility model also provides a welding device which comprises the welding head and the welding seat, wherein the welding head is arranged above the welding seat.

In the technical scheme of the utility model, the welding teeth of the welding head are mutually attached, so that the welding length is shortened, the area of a welding area is reduced, more active substances can be coated on the pole piece, and the energy density of the battery is further improved. Meanwhile, the periphery of the welding part of the welding head is an arc surface, so that the pole piece is not easy to press and penetrate during welding, and the safety of welding the pole lugs is improved.

Drawings

FIG. 1 is a top view of a tab welded to a pole piece;

FIG. 2 is a schematic view of a soldering head according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic diagram of a structure of a plurality of teeth in a straight line according to an embodiment of the present utility model;

FIG. 5 is a schematic view showing a structure of a plurality of teeth in a diagonal distribution in an embodiment of the present utility model;

FIG. 6 is a side view of two teeth according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a welding device according to an embodiment of the utility model.

Description of the reference numerals

Reference numerals	Name of the name	Reference numerals	Name of the name
				1	Welding head	11	Welding tooth
12	Base seat	2	Welding seat
				3	Pole piece	4	Tab
31	Weld groove

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, fig. 1 is a top view of a lithium battery electrode plate 3 and a tab 4, the electrode plate 3 includes a foil and an active material coated on the surface of the foil, the foil of the positive electrode plate 3 is typically an aluminum foil, and the foil of the negative electrode plate 3 is a copper foil. The active material is a material capable of intercalating or deintercalating lithium ions during charge and discharge of a lithium battery, and generally, the higher the active material capacity, the higher the energy density of the lithium battery.

In the production process of the battery, the tab 4 needs to be welded on the pole piece 3, a welding groove 31 is usually arranged on the pole piece 3 corresponding to the tab 4, and the tab 4 is welded with a foil at the bottom of the welding groove 31 in the welding groove 31. The weld groove 31 is typically formed by removing the active material layer of the pole piece 3 by laser cleaning, so that the area of the weld groove 31 affects the capacity of the active material on the pole piece 3, and it is important how to reduce the area of the weld groove 31 to increase the energy density of the battery.

In contrast, referring to fig. 2 and 3, an embodiment of the present utility model provides a welding head 1 for a tab of a battery pole piece, so as to shorten the welding length and improve the energy density of the battery. The welding head 1 comprises a plurality of welding teeth 11 which are mutually abutted, the tops of the welding teeth 11 form a welding part of the welding head 1, and the periphery of the welding part is an arc surface.

The welding head 1 of the embodiment is used for welding the pole piece 3 and the pole lug 4 of the battery. Alternatively, the welding head 1 is an ultrasonic welding head 1, the welding head 1 includes a plurality of welding teeth 11, the plurality of welding teeth 11 are arranged side by side and are arranged on the base 12 in a mutually abutting manner, and the direction in which the plurality of welding teeth 11 are arranged is specifically along the length direction of the tab 4. Because the plurality of welding teeth 11 are arranged in a mutually abutting mode, the welding length is reduced, the length of the welding groove 31 is shortened, the active material capacity on the pole piece 3 is improved, and therefore the energy density of the battery is improved.

The welding of battery pole piece 3 utmost point ear 4 also can influence the security performance of battery, if welding head 1's welding tooth 11 is sharp relatively, when the welding, welding head 1 presses pole piece 3 easily, causes the battery internal short circuit, and the security is lower. In this regard, the welding portion of the welding head 1 of the present embodiment is constituted by the top portions of the plurality of welding teeth 11, and it is understood that the top portions of the welding teeth 11 are the end portions of the welding teeth 11 pressed toward the tab 4. The periphery of the welding part is an arc surface which can be formed by rounding the top of the welding tooth 11, and the size of the rounding is optionally in the range of R=0.05-5 mm. Further, the top surface of the welding tooth 11 is a plane, so when the welding part of the welding head 1 presses the tab 4 of the pole piece 3, the welding tooth 11 is not easy to press the pole piece 3 due to the fact that the periphery of the welding part is an arc surface and the top surface is a plane, and the safety performance of the battery is improved.

In some embodiments, the welding teeth 11 are gradually tapered from bottom to top, and the periphery of the top of the welding teeth 11 is a cambered surface. In this embodiment, the periphery of the top of the welding tooth 11 is an arc surface, and specifically, the welding tooth 11 located at the outermost periphery of the welding portion may be rounded, or the top of each welding tooth 11 may be rounded.

Alternatively, the taper is one of a polygonal pyramid, a cone and an elliptical cone.

In this embodiment, the teeth 11 are tapered to reduce stress concentration and crack propagation of the teeth 11, and meanwhile, the bottom of the teeth 11 is wide, so that the effective area contacting with the base 12 can be increased, which is beneficial to improving the strength and reliability of the welding head 1.

Referring to fig. 4 and 5, in some embodiments, the teeth 11 are quadrangular pyramid-shaped teeth 11, and the plurality of teeth 11 are distributed in a rectangular array. The welding portion of the welding head 1 is rectangular, and the top surface size of the welding portion is preferably 3mm 16mm.

Alternatively, as shown in fig. 4, the bottom edges of two adjacent welding teeth 11 are abutted against each other, that is, a plurality of welding teeth 11 are distributed in a straight line shape, and the welding teeth 11 are horizontally arranged. Or as shown in fig. 5, the bottom corners of two adjacent welding teeth 11 are abutted against each other, that is, a plurality of welding teeth 11 are distributed in a diagonal shape, the welding teeth 11 are arranged at a certain angle on the horizontal plane, and preferably, the welding teeth 11 are arranged at 45 degrees on the horizontal plane.

In some embodiments, the welding part formed by arranging the plurality of welding teeth 11 can be in other shapes, the welding marks formed by the welding part on the pole piece can be in an I shape, a king shape or a trapezoid shape, and the whole welding mark area is kept unchanged so as to facilitate the distinguishing and the tracing of the manufacturing process.

In some embodiments, the edges of the four-sided pyramid shaped teeth 11 are provided with rounded transitions. The edge of the welding tooth 11 of this embodiment is rounded off for the periphery of welding tooth 11 is smooth, and welding tooth 11 presses into the in-process of utmost point ear 4 and pole piece 3, has avoided the edge of welding tooth 11 to pierce through pole piece 3, has further improved the security of battery.

Referring to fig. 6, in some embodiments, the height of the tooth 11 from bottom to top ranges from h=0.1 to 0.3mm.

Alternatively, the angle between two adjacent teeth 11 may range from d=75° -105 °.

In this embodiment, the preferred range of the height of the welding teeth 11 is 0.1-0.3 mm, the preferred range of the included angle between two adjacent welding teeth 11 is 75 ° -105 °, the welding teeth 11 in the above parameter range are beneficial to the welding head 1 to weld the pole piece 3 pole lug 4, and the welding effect is good.

Referring to fig. 7, the present utility model further provides a welding device, which includes the welding head 1 and the welding seat 2 as described in the above embodiment, and the welding head 1 is disposed above the welding seat 2. The upper surface of the welding seat 2 can be provided with a pole piece 3, the pole lug 4 is arranged in a welding groove 31 of the pole piece 3, and after the pole lug 4 of the pole piece 3 is positioned and fixed, the welding head 1 above the welding seat 2 is pressed down, so that the pole lug 4 is welded on the pole piece 3.

The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.

Claims

1. The welding head for the electrode lug of the battery pole piece is characterized by comprising a plurality of welding teeth which are mutually attached, wherein the tops of the welding teeth form a welding part of the welding head, and the periphery of the welding part is an arc surface.

2. The welding head of claim 1, wherein the welding teeth are tapered from bottom to top, and the periphery of the top of the welding teeth is a cambered surface.

3. The welding head of claim 2 wherein the taper is one of a polygonal pyramid, a cone and an elliptical cone.

4. The welding head of claim 2 wherein the teeth are quadrangular pyramid shaped teeth, a plurality of the teeth being distributed in a rectangular array.

5. The welding head of claim 4 wherein the bottom edges of two adjacent teeth abut each other; or the bottom corners of two adjacent welding teeth are mutually abutted.

6. The welding head of claim 4 wherein the edges of the four sided pyramid shaped teeth are provided with rounded transitions.

7. The welding head of claim 2 wherein the height of the teeth from bottom to top ranges from 0.1 to 0.3mm.

8. A welding head as claimed in claim 2, wherein the angle between adjacent teeth is in the range 75 ° -105 °.

9. The welding head of claim 1, wherein the welding head is an ultrasonic welding head.

10. A welding device comprising a welding head according to any one of claims 1-9 and a welding seat, said welding head being arranged above said welding seat.