CN216773307U

CN216773307U - Soft-package button type lithium battery

Info

Publication number: CN216773307U
Application number: CN202220092201.9U
Authority: CN
Inventors: 刘宏飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-06-17
Anticipated expiration: 2032-01-12

Abstract

The utility model relates to a soft-package button lithium battery which comprises a shell and a rolled battery cell, wherein the rolled battery cell comprises a positive plate, a negative plate, a positive lug and a negative lug, the positive plate and the negative plate are wound in a laminating way, the positive lug and the negative lug are respectively connected to the middle position of the positive plate and the negative plate in a conductive way, the positive lug and the negative lug are respectively arranged at the positions which are far from the outer end portions 1/6-1/3 of the positive plate and the negative plate, the rolled battery cell is coated in the shell, and the positive lug and the negative lug extend out of the shell. The flexible aluminum-plastic film shell is adopted to wrap the coiled battery cell, a packaging skirt edge is not required to be arranged, and the internal space with the diameter of about 1mm can be saved; meanwhile, the positive and negative electrode tabs are connected to the middle positions of the positive and negative electrode plates, and the positive and negative electrode tab packages do not occupy the diameter position of the button lithium battery; therefore, the button lithium batteries with the same size and specification can improve the capacity of the battery, the button lithium batteries with the same capacity can reduce the size of the battery, and the energy density of the battery is higher; meanwhile, the internal resistance of the button lithium battery can be greatly reduced, and the self-power consumption of the battery is reduced.

Description

Soft-package button type lithium battery

Technical Field

The utility model relates to the technical field of button cells, in particular to a soft package button lithium battery.

Background

A button cell is also called a button cell, and refers to a cell with a size similar to a small button, generally having a larger diameter and a thinner thickness. Button cells are widely used in various miniature electronic products due to their small size.

Traditional button cell generally is provided with the encapsulation shirt rim, like the button cell disclosed in utility model patent publication No. CN212848643U, including upper cover, lower cover, insulating support frame and laminate polymer core, form annular shirt rim in laminate polymer core's the periphery. According to the button cell with the structure, the skirt edge occupies the diameter position of the cell of about 1mm, so that the capacity of the button cell can be reduced under the condition of the same diameter, the size of the button cell can be increased under the condition of the same capacity, and the energy density of the cell is reduced. In addition, the tab of the traditional button lithium battery is generally welded at the end parts of the positive and negative plates, so that the internal resistance of the lithium battery is larger on one hand, and the tab bonding wire also occupies a certain diameter position on the other hand, so that the energy density of the battery is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to overcome the defects of the prior art and provide a soft package button lithium battery, which can improve the capacity of the battery under the condition of the same size specification and reduce the size of the battery under the condition of the same capacity, and has higher energy density and smaller internal resistance.

The utility model adopts the following technical scheme:

the utility model provides a soft package knot formula lithium cell, is including the shell and roll up system electric core, rolls up system electric core and includes positive plate, negative pole piece, positive ear, negative pole ear, and just, the range upon range of coiling of negative pole piece, just, the negative pole ear is electrically conductive to be connected just, the intermediate position of negative pole piece respectively, and just, negative pole piece length department of the outer tip 1/6 ~ 1/3 of negative pole piece apart from, roll up system electric core cladding in the shell, just, the negative pole ear stretches out from the shell.

Further, the shell is made of flexible aluminum-plastic films.

Furthermore, a groove for filling the coiled battery cell is formed on the aluminum-plastic film, the coiled battery cell is filled in the groove, and the positive and negative electrode lugs extend out from the connection position of the upper seal of the aluminum-plastic film.

Furthermore, the positive and negative electrode tabs are connected with tab glue blocks for fusing and bonding with the aluminum plastic film during packaging.

Further, the rolled battery cell is cylindrical.

Furthermore, the aluminum plastic film is formed with two symmetrically arranged semi-cylindrical grooves, and the two semi-cylindrical grooves form a cavity capable of wrapping the coiled battery cell when the aluminum plastic film is folded in half.

Further, the rolled battery cell also comprises a diaphragm for separating the positive electrode sheet and the negative electrode sheet, and the diaphragm, the positive electrode sheet and the negative electrode sheet are stacked and wound together.

Furthermore, the outer layer of the rolled battery cell is wound with a high-temperature adhesive tape for fixing the rolled battery cell.

As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:

firstly, the flexible aluminum-plastic film shell is adopted to wrap the coiled battery cell, a packaging skirt edge is not required to be arranged, and the internal space with the diameter of about 1mm can be saved; meanwhile, the positive and negative electrode tabs are connected to the middle positions of the positive and negative electrode plates, and the positive and negative electrode tabs are packaged without occupying the diameter position of the button lithium battery; therefore, the lithium button cell battery with the same size and specification can improve the capacity of the battery, and the lithium button cell battery with the same capacity can reduce the size of the battery, so that the energy density of the battery is higher.

Secondly, the positive and negative electrode tabs are connected to the middle position of the positive and negative electrode plates, so that the internal resistance can be greatly reduced and the self-power consumption of the battery can be reduced compared with a button lithium battery with the positive and negative electrode tabs connected to the end parts of the positive and negative electrode plates; meanwhile, the positive and negative electrode lugs are led out and then positioned in the middle of the end face of the lithium battery, so that welding wires are convenient to use.

Drawings

Fig. 1 is a schematic perspective view of a rolled cell in example 1 of the present invention;

fig. 2 is a schematic view of an expanded structure of the positive plate and the negative plate in example 1 of the present invention, in which connection positions of the positive tab and the negative tab on the positive plate and the negative plate are shown;

FIG. 3 is a schematic perspective view of an aluminum plastic film according to example 1 of the present invention;

fig. 4 is a schematic view of a three-dimensional structure of a coiled cell filled in an aluminum plastic film in embodiment 1 of the present invention;

fig. 5 is a schematic perspective view of a packaged lithium button cell in the embodiment 1 of the present invention.

In the figure: 1. the battery comprises a shell, 11 semi-cylindrical grooves, 2 coiled battery cells, 21 positive plates, 22 negative plates, 23 positive lugs, 24 negative lugs, 3 high-temperature adhesive tapes and 4 lug adhesive blocks.

Detailed Description

The utility model is further described below by means of specific embodiments.

Example 1

Referring to fig. 1 to 5, the utility model provides a soft-package button lithium battery, which comprises a shell 1 and a coiled battery cell 2. The coiled battery cell 2 comprises a positive plate 21, a negative plate 22, a positive tab 23, a negative tab 24 and a diaphragm for separating the positive plate 21 from the negative plate 22, the positive plate 21, the diaphragm and the negative plate 22 are wound in a laminated manner, the positive tab 23 and the negative tab 24 are respectively connected to the middle positions of the positive plate 21 and the negative plate 22 in a conductive manner and are away from the positive plate 21 and the negative plate 22 at the outer end 1/5 of the positive plate 21 and the negative plate 22. In this embodiment, the lengths of the positive and negative electrode tabs are 360mm, and the positive tab 23 and the negative tab 24 are respectively connected to the positions 72mm away from the outer ends of the positive tab 21 and the negative tab 22. The coiled battery core 2 is cylindrical. The outer layer of the coiled battery cell 2 is wound with a high-temperature adhesive tape 3 for fixing the coiled battery cell 2. The coiled battery cell 2 is coated in the shell 1, and the positive electrode tab 23 and the negative electrode tab 24 extend out of the shell 1.

The housing 1 is made of a flexible aluminum plastic film. The aluminum-plastic film is provided with two symmetrically-arranged semi-cylindrical grooves 11 for filling the rolled battery cell 2, the two semi-cylindrical grooves 11 form a cavity capable of wrapping the rolled battery cell 2 when the aluminum-plastic film is folded, the rolled battery cell 2 is filled in the cavity, and the positive electrode lug 23 and the negative electrode lug 24 extend out from the sealing connection position at the upper part of the aluminum-plastic film. The positive tab 23 and the negative tab 24 are connected with tab glue blocks 4 for melting and bonding with the aluminum plastic film during packaging to form an effective packaging structure.

Compared with the existing button lithium battery with the packaging skirt edge, the internal resistance of the button lithium battery with the packaging skirt edge with the same size and specification is about 320 milliohms, and the internal resistance of the soft package button lithium battery is about 220 milliohms; the capacity is increased by more than 10 milliamperes compared with the button lithium battery with the packaging skirt edge.

Example 2

This example differs from example 1 in that: the shell 1 adopts the plastic-aluminum membrane, is formed with a cylindrical groove that is used for filling system electric core 2 of book on the plastic-aluminum membrane, and system electric core 2 of book fills in this cylindrical groove, and the plastic-aluminum membrane upper portion is sealed will roll up system electric core 2 cladding in it, and anodal ear 23, negative pole ear 24 are from the mouth of sealing and are stretched out. The positive tab 23 and the negative tab 24 are respectively connected to the positive tab length and the negative tab length which are respectively away from the outer end 1/6 of the positive tab 21 and the negative tab 22, namely the positive tab 23 and the negative tab 24 are respectively connected to the positions which are 60mm away from the outer end of the positive tab 21 and the outer end of the negative tab 22.

Example 3

This example differs from example 1 in that: the positive tab 23 and the negative tab 24 are respectively connected to the positive tab length and the negative tab length which are away from the outer end 2/9 of the positive tab 21 and the negative tab 22 in a conductive manner, namely the positive tab 23 and the negative tab 24 are respectively connected to the positions which are away from the outer end 80mm of the positive tab 21 and the negative tab 22.

The above description is only three specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims

1. The utility model provides a soft packet of knot formula lithium cell which characterized in that: including the shell and roll up system electric core, roll up system electric core and include positive plate, negative pole piece, positive tab, negative pole ear, just, the range upon range of coiling of negative pole piece, just, negative pole ear electrically conducts the connection respectively just, the intermediate position of negative pole piece, apart from just, the outer tip 1/6 ~ 1/3 of negative pole piece just, negative pole piece length department, roll up system electric core cladding in the shell, just, the negative pole ear stretches out from the shell.

2. The soft-packed lithium button cell of claim 1 wherein: the shell is made of a flexible aluminum-plastic film.

3. The soft-packed lithium button cell of claim 2 wherein: a groove for filling a rolled battery cell is formed in the aluminum-plastic film, the rolled battery cell is filled in the groove, and the positive and negative electrode lugs extend out from the sealing connection position on the upper portion of the aluminum-plastic film.

4. A soft-packed lithium button cell according to claim 3, wherein: and the positive and negative electrode lugs are connected with lug glue blocks for melting and bonding with the aluminum plastic film during packaging.

5. A soft-packed lithium button cell according to claim 3, wherein: the coiled battery cell is cylindrical.

6. The soft-packed lithium button cell of claim 5 wherein: the aluminum-plastic film is provided with two symmetrically arranged semi-cylindrical grooves, and the two semi-cylindrical grooves form a cavity capable of wrapping the coiled battery cell when the aluminum-plastic film is folded.

7. The flexible package lithium button cell of claim 1 wherein: the coiled battery cell further comprises a diaphragm for separating the positive electrode sheet and the negative electrode sheet, and the diaphragm, the positive electrode sheet and the negative electrode sheet are laminated and wound together.

8. The soft-packed lithium button cell of claim 1 wherein: the outer layer of the rolled battery cell is wound with a high-temperature adhesive tape for fixing the rolled battery cell.