CN215989128U

CN215989128U - Aluminum-to-nickel tab and battery cell comprising same

Info

Publication number: CN215989128U
Application number: CN202122364877.7U
Authority: CN
Inventors: 方东林; 安站东; 王明菊; 许佳庆; 乔龙龙; 王帅; 康利斌; 唐堃
Original assignee: Huayang New Material Technology Group Co ltd; Beijing Zhongke Haina Technology Co ltd
Current assignee: Huayang New Material Technology Group Co ltd; Beijing Zhongke Haina Technology Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-03-08
Anticipated expiration: 2031-09-28

Abstract

The utility model discloses an aluminum-to-nickel tab and a battery cell comprising the same, which are used for a battery, wherein the aluminum-to-nickel tab comprises an aluminum tab and a nickel strap; wrapping part of the nickel strap on part of the aluminum lug to form a U-shaped structure, and fixing the wrapped part to obtain an aluminum-to-nickel lug; the battery core comprises a battery main body, an aluminum-to-nickel tab and tab glue; the aluminum-to-nickel tab is bent at the tab glue position, and the aluminum-to-nickel tab is completely exposed out of the tab glue; the utility model has strong welding resistance, the whole volume of the battery is reduced, and both sides of the tab can be added with tin; the debugging difficulty of the welding equipment is reduced, and a large amount of debugging time and loss test materials are saved.

Description

Aluminum-to-nickel tab and battery cell comprising same

Technical Field

The utility model relates to the technical field of batteries, in particular to an aluminum-to-nickel tab and a battery cell comprising the tab.

Background

With the rise and application of lithium ion batteries, sodium ion batteries and the like, the process technology is gradually optimized, wherein the soft package battery core has the advantages of high safety, light weight, large capacity, small internal resistance, flexible design and the like, so the soft package battery core is widely applied.

The soft package battery core mainly comprises an anode, a cathode, a diaphragm, an aluminum-plastic packaging film, an anode tab and a cathode tab.

The appearance structure of the soft-packaged cell comprises a cell main body, and a positive electrode lug and a negative electrode lug which are exposed out of the cell main body. The exposed positive and negative electrode tabs are used for connecting the battery core or the protection circuit, wherein the positive electrode tabs are generally made of aluminum materials, and the negative electrode tabs are generally made of nickel materials or nickel-plated materials. One of the problems is that the tab of the aluminum material cannot be soldered when the battery is soldered using tin. Therefore, one necessary process for connecting the soft-packaged battery cell by using tin is to perform aluminum-to-nickel conversion or aluminum-to-nickel-plated metal tab on the positive electrode aluminum tab. Generally, the tail end of an aluminum tab is welded with a nickel tab by ultrasonic waves, and the like, namely, the positive aluminum tab is cut with a nickel strap with the same width by a specified length and then is superposed on the aluminum tab, namely, a section of the aluminum tab is superposed with a section of the nickel strap, and then the superposed part is welded by ultrasonic waves and the like. The existing aluminum-to-nickel conversion has the following problems: firstly, the welding capacities of aluminum and nickel such as ultrasonic wave resistance are far from each other, so that the aluminum tab is easy to break and generate a notch in the welding process, the qualification rate is low, and the safety of the battery cannot be guaranteed; secondly, in order to ensure reliable welding, the parameter debugging of the welding equipment needs to be continuously adjusted so as to reach the optimal state, so that the debugging of the equipment parameters has great difficulty, and a great deal of time and test materials are consumed.

Therefore, how to put an end to the damage of the aluminum tab when the aluminum is converted into the nickel, and the problems of improving the qualification rate, ensuring the safety of the battery cell, reducing the debugging time of the equipment parameters and the like become one of the key points of the process research of the soft-package battery cell.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an aluminum-to-nickel tab and a battery cell comprising the tab, and solves the problems that the welding resistance of aluminum and nickel is poor, the debugging difficulty of welding equipment is high, and the debugging consumes a large amount of time and consumes test materials.

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

an aluminum-to-nickel tab comprises an aluminum tab and a nickel strap, wherein the nickel strap is bent to form a U-shaped structure, the aluminum tab is bent to form a bent structure, and the inside of the U-shaped structure is jointed and welded with the bent structure; the bending structure comprises a connecting end, a third fitting section, a second connecting section, a third bending angle and a fourth bending angle; the connecting end is connected with the second connecting section at the third bending angle, and the second connecting section is connected with the third attaching section at the fourth bending angle; the second connecting section is 0-4 cm; the third fitting section is 2-6 cm; the U-shaped structure comprises an exposure section, a first attaching section, a second attaching section, a first connecting section, a first bending angle and a second bending angle; the nickel strap exposed section is connected with the first attaching section, the first attaching section is connected with the first connecting section at the first bending angle, the first connecting section is connected with the second attaching section at the second bending angle in an attaching mode, and two sides of the third attaching section are respectively attached to the first attaching section and the second attaching section; the second attaching section is 2-6 cm.

The battery cell comprises one or more than one aluminum-to-nickel tab, and the aluminum-to-nickel tab is bent at the tab glue position and is completely exposed out of the tab glue.

Because utility model adopts the structure of nickel strap parcel aluminium material to can obtain following beneficial effect:

1) the utmost point ear of accomplishing commentaries on classics nickel process is upwards buckling the back, and it stretches out battery subject position part and is the material that can add tin, and utmost point ear both sides all can add tin, stretches out battery subject position part and makes the whole space of battery reduce through buckling, makes things convenient for the battery equipment.

2) The existing aluminum-nickel conversion mode is that a lug made of aluminum material is superposed with a nickel strap, so that the aluminum lug at the aluminum-nickel joint is easily broken, and the whole battery is scrapped. And the utility model changes the nickel pole ear from aluminum, the upper and lower layers are all nickel strips, there is not the cracked possibility of nickel strip.

3) The existing aluminum-to-nickel mode requires extremely accurate welding parameters, the excessive power can lead to the over-welding fracture or poor conductivity of the aluminum tab, the insufficient power can lead to the cold joint, and the tab generates heat to bring potential safety hazards. The aluminum-to-nickel tab of the utility model has lower accuracy of welding parameters, the wrapped aluminum tab cannot be deformed or broken due to larger power, and one surface of the nickel strap can be completely connected with the aluminum tab due to smaller power, so that the normal use and the overcurrent performance of the battery cannot be affected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in further detail below with reference to the accompanying drawings, and it is obvious that fig. 1 in the following description is only an embodiment of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided fig. 1 without creative efforts.

Fig. 1 is a schematic diagram of a soft-packaged cell according to the utility model.

In the figure: 1 pole lug glue, 2 aluminum pole lugs, 3 double-layer nickel strips wrapping aluminum pole lug coincidence areas (welding areas in an ultrasonic mode and the like) and 4 nickel strips.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the embodiment of the utility model discloses an aluminum-to-nickel tab and a battery cell comprising the tab, as shown in fig. 1, the tab comprises tab glue, an aluminum tab, a double-layer nickel strap wrapping aluminum tab superposition area (ultrasonic or other mode welding area) and a nickel strap.

Specifically, the terminal of aluminium material utmost point ear 2 before assembling electric core is higher than utmost point ear and glues 1 preferred 5mm department and cuts off, and cut the nickel strap 4 of equal width with the one end of nickel strap 4 behind the specified length preferred 4mm of buckling, form U type structure, wrap the one end of taking U type structure and formed the coincidence section of two-layer nickel strap 4 parcel one deck aluminium material utmost point ear 2 on aluminium material utmost point ear 2, its coincidence part is preferred 4mm, carry out ultrasonic bonding with the coincidence section after, buckle nickel strap 4 down the back and upwards roll over with the battery main part laminating parallel, nickel strap 4 stretches out battery main part. And bending the aluminum-to-nickel tab at the tab glue 1, wherein the aluminum-to-nickel tab is completely exposed out of the tab glue 1.

Example 2:

on the basis of embodiment 1, an aluminum-to-nickel tab and a battery cell comprising the tab further include: the nickel strap is pure nickel or nickel-plated material alloy.

Example 3:

on the basis of embodiment 1, an aluminum-to-nickel tab and a battery cell comprising the tab further include: the overlapped part is reinforced by stamping.

Specifically, the terminal of the aluminum tab 2 before the electrical core assembly is higher than the tab glue 1 and is preferably cut at 5mm, and the nickel strap 4 with the same width is cut to the specified length and then is bent at 4mm, so as to form a U-shaped structure, one end of the tab 2 with the U-shaped structure is wrapped on the aluminum tab 2 to form a superposition section of two layers of aluminum tabs 2 wrapped by the nickel strap 4, the superposition section is preferably 4mm, after the superposition section is punched and reinforced, the nickel strap 4 is bent downwards and then is folded upwards in parallel with the battery main body, and the nickel strap 4 extends out of the battery main body. And bending the aluminum-to-nickel tab at the tab glue 1, wherein the aluminum-to-nickel tab is completely exposed out of the tab glue 1.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an aluminium changes nickel utmost point ear which characterized in that: contain aluminium utmost point ear, nickel strap, the nickel strap is buckled and is U type structure, aluminium utmost point ear is buckled and is buckled the structure, inside with the structure laminating welding of buckling of U type structure.

2. The aluminum-to-nickel tab of claim 1 wherein: the bending structure comprises a connecting end, a third fitting section, a second connecting section, a third bending angle and a fourth bending angle; the connection end is connected with the second connection section at the third bending angle, and the second connection section is connected with the third pasting section at the fourth bending angle.

3. The aluminum-to-nickel tab of claim 2 wherein: the second connecting section is 0-4 cm.

4. The aluminum-to-nickel tab of claim 2 wherein: the third fitting section is 2-6 cm.

5. The aluminum-to-nickel tab of claim 2 wherein: the U-shaped structure comprises an exposure section, a first attaching section, a second attaching section, a first connecting section, a first bending angle and a second bending angle; the nickel strap exposes the section with first laminating section links to each other, first laminating section with first linkage segment in first angle department of buckling links to each other, first linkage segment with second laminating section laminate in angle department of buckling links to each other, third laminating section both sides are laminated respectively first laminating section with second laminating section.

6. The aluminum-to-nickel tab of claim 5 wherein: the second attaching section is 2-6 cm.

7. An electric core, characterized by comprising the aluminum-to-nickel tab of any one of claims 1 to 6, wherein the tab glue is provided on the aluminum-to-nickel tab.

8. The cell of claim 7, wherein: the aluminum-to-nickel tab is bent at the tab glue position.

9. The cell of claim 8, wherein: and the aluminum-nickel-converted tab is completely exposed out of the tab glue.