CN217134462U - Lithium battery with tab middle-arranged welding structure - Google Patents

Abstract

The utility model discloses a lithium cell with put welded structure in utmost point ear relates to the lithium cell field, and it includes the casing, is provided with roll core structure and electrolyte that is formed by positive plate, negative pole piece according to the preface coiling in the casing, and negative pole piece surface cladding has the barrier film in order to keep apart just, negative pole, the positive plate includes the anodal mass flow body and sets up the anodal active coating layer on the anodal mass flow body, the negative pole piece includes the negative pole mass flow body and sets up the negative pole active coating layer on the negative pole mass flow body, and the middle part position of anodal mass flow body and negative pole mass flow body all is provided with half empty paper tinsel region, is provided with utmost point ear on half empty paper tinsel region. The utility model discloses a relative tradition mode (utmost point ear sets up on the mass flow body top) has improved active material coating area, has improved energy density on the one hand. On the other hand, when the positive plate and the negative plate are wound, the tab is located at the center position after the winding, so that the internal resistance can be effectively reduced.

Description

Lithium battery with tab middle-arranged welding structure

Technical Field

The utility model relates to a lithium cell field, especially a lithium cell with put welded structure in utmost point ear.

Background

The tab is a raw material of a lithium ion battery product. For example, the tabs are needed for mobile phone batteries, bluetooth batteries, notebook batteries and the like used in our lives. The battery is divided into positive and negative electrodes, the tabs are metal conductors leading out the positive and negative electrodes from the battery core, and the ears of the positive and negative electrodes of the battery are contact points during charging and discharging. This contact point is not the copper sheet that we see on the outside of the cell, but rather a connection inside the cell. However, in the prior art, the tabs are usually welded on the completely empty foil areas at the two ends of the aluminum foil or the copper foil, so that the coating area of effective active substances is reduced, the energy density of the battery is influenced to a certain extent, and the tabs arranged at the two ends of the pole piece have the problem of difficult packaging after winding.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a lithium cell with put welded structure in utmost point ear.

In order to achieve the above purpose, the utility model provides a technical scheme is:

the utility model provides a lithium cell with put welded structure in utmost point ear, its includes the casing, is provided with roll core structure and electrolyte that forms by positive plate, negative pole piece according to the preface convolute in the casing, and negative pole piece surface cladding has the barrier film in order to keep apart just, negative pole, the positive plate includes the anodal mass flow body and sets up the anodal active coating layer on the anodal mass flow body, the negative pole piece includes the negative pole mass flow body and sets up the negative pole active coating layer on the negative pole mass flow body, and the middle part position of the anodal mass flow body and the negative pole mass flow body all is provided with half empty paper tinsel region, is provided with utmost point ear on the half empty paper tinsel region.

As the preferred scheme of the utility model: and both ends of the positive plate are provided with completely empty foil areas.

As the preferred scheme of the utility model: the width of the semi-hollow foil area accounts for 1/2-2/3 of the width of the corresponding current collector.

As the preferred scheme of the utility model: the end parts of the pole lugs are of arc structures or chamfer structures.

As the preferred scheme of the utility model: and the tab is provided with tab glue and a welding spot area.

As the preferred scheme of the utility model: the width of the tab glue is larger than that of the tab.

The utility model has the advantages that: the utility model discloses a middle part position at the anodal mass flow body and the negative current collection body leaves the half empty paper tinsel region, sets up utmost point ear on this half empty paper tinsel region, on the one hand traditional mode relatively (utmost point ear sets up on the mass flow body top), has bigger active material coating area, has improved energy density. And on the other hand, the tab is positioned in the middle position, so that the internal resistance of the battery can be effectively reduced.

Drawings

FIG. 1 is a schematic view of a conventional positive plate;

fig. 2 is a schematic view of a conventional negative electrode sheet structure;

FIG. 3 is a schematic diagram of a conventional lithium battery pole piece after being wound;

fig. 4 is a schematic structural diagram of a positive plate according to a preferred embodiment of the present invention;

fig. 5 is a schematic structural view of a negative plate according to a preferred embodiment of the present invention;

FIG. 6 is a schematic view of the wound pole piece according to the preferred embodiment of the present invention;

in the figure, 100-positive plate, 101-positive electrode current collector, 102-positive electrode active coating layer, 1021-complete empty foil area, 1022-semi-empty foil area, 200-negative plate, 201-positive electrode current collector, 202-negative electrode active coating layer, 300-tab, 301-tab glue, and 302-welding spot area.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 6, a preferred embodiment of the present invention:

the utility model provides a lithium cell with put welded structure in utmost point ear, its includes the casing, is provided with core structure and electrolyte that is formed by positive plate 100, the winding of negative pole piece 200 in proper order in the casing, and negative pole piece 200 surface cladding has the barrier film in order to keep apart just, the negative pole, positive plate 100 includes anodal mass flow body 101 and sets up anodal active coating 102 on anodal mass flow body 101, negative pole piece 200 includes the negative pole mass flow body 201 and sets up the negative pole active coating 202 on the negative pole mass flow body 201, and the middle part position of anodal mass flow body 101 and negative pole mass flow body 201 all is provided with half empty regional 1022 of paper tinsel, is provided with utmost point ear 300 on half empty paper tinsel regional 1022. In a specific application, the positive current collector 101 is an aluminum foil, the negative current collector 201 is a copper foil, and the tab 300 is a nickel tab.

By leaving a semi-empty foil area 1022 in the middle of the positive electrode current collector 101 and the negative electrode current collector 201, and providing the tab 300 on the semi-empty foil area 1022, on one hand, compared with the conventional method (the tab is provided at the side end of the completely empty foil area of the current collector, as shown in fig. 1-2), the method has the advantages of larger active material coating area and improved energy density. On the other hand, when the positive plate and the negative plate are wound, the tab is located at the central position after the winding, so that the internal resistance of the battery can be effectively reduced (as shown in fig. 3 and 6).

As a preferred embodiment of the present invention, it may also have the following additional technical features:

both ends of the positive plate 100 are provided with completely empty foil areas 1021, the empty foil at the head of the positive plate is reserved for the purpose that the negative plate can completely wrap the positive plate during winding, and the empty foil at the tail of the positive plate is reserved for the purpose of ending and wrapping with aluminum foil.

The width of the semi-empty foil regions 1022 is 1/2-2/3 of the width of their corresponding current collectors.

The tip of utmost point ear 300 is arc structure or chamfer structure, and relative right angle structure can greatly increased utmost point ear position location fluctuation deviation, can prevent effectively that utmost point ear closed angle from puncturing the foil and causing the short circuit in the welded time of utmost point ear 300, more does benefit to processing.

The tab 300 is provided with tab glue 301 and a welding spot area 302. The width of the tab glue 301 is greater than that of the tab 300.

The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.

The above is only the preferred embodiment of the present invention, as long as the technical solution of the purpose of the present invention is realized by the substantially same means, all belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a lithium cell with put welded structure in utmost point ear, its includes the casing, is provided with in the casing by positive plate (100), negative pole piece (200) according to the preface roll up core structure and the electrolyte that forms of convoluteing, negative pole piece (200) surface cladding has barrier film, its characterized in that: the positive plate (100) comprises a positive current collector (101) and a positive active coating layer (102) arranged on the positive current collector (101), the negative plate (200) comprises a negative current collector (201) and a negative active coating layer (202) arranged on the negative current collector (201), the middle positions of the positive current collector (101) and the negative current collector (201) are respectively provided with a half-empty foil area (1022), and a tab (300) is arranged on the half-empty foil area (1022).

2. The lithium battery of claim 1 having a tab mid-welded structure, wherein: both ends of the positive plate (100) are provided with completely empty foil areas (1021).

3. The lithium battery of claim 1 having a tab mid-welded structure, wherein: the width of the semi-empty foil region (1022) occupies 1/2-2/3 of the width of the corresponding current collector.

4. The lithium battery of claim 1 having a tab mid-welded structure, wherein: the end parts of the tabs (300) are of arc structures or chamfer structures.

5. The lithium battery of claim 1 having a tab mid-welded structure, wherein: the tab (300) is provided with tab glue (301) and a welding spot area (302).

6. The lithium battery of claim 5 having a tab mid-welded structure, wherein: the width of the tab glue (301) is larger than that of the tab (300).

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