CN217035736U - Multi-lug battery cell structure and battery cell cutting device - Google Patents

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a multi-tab battery cell structure and a battery cell cutting device, which comprise a first pole piece (1), a second pole piece (2) and an isolating film; the first pole piece (1) and the isolating film are compounded in a hot pressing mode, the second pole piece (2) is wound to form a naked battery cell (3), and at least one end of the naked battery cell (3) is cut to form a plurality of pole lugs (4). The utility model can improve the problem that the multiple tabs are difficult to align and is beneficial to reducing the production cost.

Description

Multi-lug battery cell structure and battery cell cutting device

Technical Field

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a multi-tab battery cell structure and a battery cell cutting device.

Background

Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. The multi-Tab structure is a novel battery cell structure, the head of a pole piece of the structure is provided with a plurality of foil tabs, and after lamination is completed, the multi-layer foil tabs are aligned to be welded together with Tab. Compared with the conventional structure, the multi-tab battery cell has smaller internal resistance, DCR and ACR, so that the charging speed is high, the temperature rise is low, and the multi-tab battery cell is very suitable for a scene of high-rate charging and discharging.

At present, the mode of cutting the tabs by laser before winding is generally adopted, the cost is high, and the final alignment degree of the multiple tabs is difficult to control.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is: the utility model provides a not enough to prior art provides a multi-tab electric core structure, can improve the problem that multi-tab is difficult to align, helps reduction in production cost.

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

a multi-tab battery cell structure comprises a first pole piece, a second pole piece and an isolation film; the first pole piece and the isolating film are compounded in a hot pressing mode, the first pole piece and the isolating film are wound to form a naked battery cell, and at least one end of the naked battery cell is cut to form a plurality of pole lugs.

Preferably, the both ends of naked electric core all set up utmost point ear, utmost point ear staggers the setting.

Preferably, a plurality of the tabs are sequentially arranged along the length direction.

Preferably, the number of the isolation films is two, and the isolation films are arranged between the first pole piece and the second pole piece at intervals.

The utility model also provides a battery cell cutting device, which comprises an upper pressing plate, a lower pressing plate and a cutter, wherein a gap for pressing a naked battery cell is formed between the upper pressing plate and the lower pressing plate, and the cutter is used for cutting the naked battery cell into a multi-tab battery cell structure.

Preferably, the upper pressing plate and the lower pressing plate are provided with through holes matched with the cutters, and the through holes extend along the length direction.

Preferably, the through hole is formed to be convex in a width direction.

Preferably, the section of the cutter is in a convex structure or a concave structure.

The utility model has the beneficial effects that the utility model comprises a first pole piece, a second pole piece and an isolating film; the first pole piece and the isolating film are compounded in a hot pressing mode, the first pole piece and the isolating film are wound to form a naked battery cell, and at least one end of the naked battery cell forms a plurality of pole lugs through cutting. Because the mode of cutting utmost point ear before coiling is generally adopted at present, with high costs and the final alignment degree of many utmost points ear is difficult to control, consequently, compound two-layer barrier film and first pole piece hot pressing in advance, then with the second pole piece, obtain the book core that does not have utmost point ear, flatten naked electric core at last, and adopt the cutter directly to cut out a plurality of utmost point ear, saved the laser cutting pole piece and formed utmost point ear, help reduction in production cost, simultaneously, the cutter directly cuts out a plurality of utmost point ear from naked electric core, improve the problem that utmost point ear is difficult to align. The utility model can solve the problem that the multiple tabs are difficult to align and is beneficial to reducing the production cost.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of the bare cell cutting process according to the present invention.

Fig. 2 is a schematic structural view of the lower platen of the present invention.

Wherein the reference numerals are as follows:

1-a first pole piece;

2-a second pole piece;

3-naked electric core;

4-pole ear;

5, an upper pressing plate;

6, pressing a plate;

7-cutting knife;

8-a through hole;

x-length direction; y-width direction.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail with reference to fig. 1 to 2, but the present invention is not limited thereto.

Implementation mode one

The multi-tab battery cell structure comprises a first pole piece 1, a second pole piece 2 and an isolating film; first pole piece 1 and barrier film hot pressing are compound to constitute naked electric core 3 with the coiling of second pole piece 2, naked electric core 3's at least one end forms a plurality of utmost point ear 4 through cutting.

Because the mode of cutting utmost point ear of present universal adoption laser before convoluteing, with high costs and the final alignment degree of many utmost point ears is difficult to control, therefore, in advance with two-layer barrier film and 1 hot pressing complex of first pole piece, then with second pole piece 2, obtain the book core that does not have utmost point ear 4, flatten naked electric core 3 at last, and adopt cutter 7 directly to surely go out a plurality of utmost point ear 4, it forms utmost point ear 4 to have saved the laser cutting pole piece, help reduction in production cost, and simultaneously, cutter 7 directly goes out a plurality of utmost point ear 4 from naked electric core 3, improve the problem that the utmost point ear is difficult to align.

In this embodiment, first pole piece 1 and barrier film hot pressing are compound, have saved first pole piece 1 of alignment and barrier film, help simplifying the winding process, avoid first pole piece 1 or barrier film to take place the position, improve the quality of battery, wherein, first pole piece 1 is the anode strip, and second pole piece 2 is the cathode strip, nevertheless the utility model discloses not use this as the limit, can be according to the polarity of actual battery structure adjustment first pole piece 1 and second pole piece 2.

In the multi-tab cell structure according to the utility model, the two ends of the bare cell 3 are both provided with tabs 4, and the tabs 4 are staggered. In this embodiment, one of them utmost point ear 4 is located the top of naked electric core 3, and another utmost point ear 4 is located the below of naked electric core, after coiling, and utmost point ear 4 about the cutter 7 direct cutting guarantees the utmost point ear alignment degree of many utmost point ear electric cores.

In the multi-tab cell structure, the isolation film is arranged between the first pole piece 1 and the second pole piece 2 at intervals, so that the first pole piece 1 and the second pole piece 2 are separated, and short circuit of the first pole piece 1 and the second pole piece 2 is avoided.

The working principle of the utility model is as follows:

with two-layer barrier film and 1 hot pressing complex of first pole piece in advance, then with second pole piece 2, obtain not having the book core of utmost point ear 4, flatten naked electric core 3 at last to adopt cutter 7 directly to surely go out a plurality of utmost point ear 4, saved laser cutting pole piece and formed utmost point ear 4, help reduction in production cost, simultaneously, cutter 7 directly surely goes out a plurality of utmost point ear 4 from naked electric core 3, improves the problem that utmost point ear is difficult to align.

Second embodiment

The difference from the first embodiment is that: the plurality of tabs 4 of this embodiment are arranged in proper order along length direction X, help increasing the quantity of tabs 4, reduce the internal resistance of electric core, improve the charging speed, and reduce the temperature rise.

Other structures are the same as those in the first embodiment, and are not described again here.

Third embodiment

The difference from the first embodiment is that: the number of the separators in the present embodiment is two, but the present invention is not limited thereto, and the number of the separators may be adjusted according to the actual battery structure.

Other structures are the same as those of the first embodiment, and are not described herein again.

Battery core cutting device

The utility model is applied to the multi-tab battery cell structures of the first to third embodiments.

Electric core cutting device, including top board 5, holding down plate 6 and cutter 7, form the gap that is used for compressing tightly naked electric core 3 between top board 5 and the holding down plate 6, cutter 7 is used for cutting into many utmost point ear electric core structure with naked electric core 3, top board 5 and holding down plate 6 all be provided with cutter 7 complex through-hole 8, through-hole 8 extends along length direction X.

Specifically, top board 5 and holding down plate 6 press naked electric core 3 to predetermineeing thickness, and cutter 7 can save laser cutting utmost point ear 4 through naked electric core 3 of through-hole 8 cutting, helps reduction in production cost.

Preferably, the through-hole 8 is formed to be convex in the width direction Y. In this embodiment, through-hole 8 is the stripe structure, can supply cutter 7 to pass, realizes cutting naked electric core 3, has saved the laser cutting process, helps reduction in production cost.

Preferably, the cross section of the cutting knife 7 is in a convex structure or a concave structure, but the utility model is not limited thereto, and the cross section of the cutting knife 7 can also be in other regular or irregular shapes.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, substitutions or alterations based on the present invention will fall within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (8)

1. A multi-tab battery cell structure comprises a first pole piece (1), a second pole piece (2) and an isolating film;

it is characterized in that the first pole piece (1) and the isolating film are compounded in a hot pressing way and wound with the second pole piece (2) to form a naked electric core (3),

at least one end of the naked electric core (3) is cut to form a plurality of pole lugs (4).

2. The multi-tab cell structure of claim 1, wherein: the both ends of naked electric core (3) all set up utmost point ear (4), setting is staggered in utmost point ear (4).

3. The multi-tab cell structure of claim 1, wherein: the plurality of the pole lugs (4) are sequentially arranged along the length direction (X).

4. The multi-tab cell structure of claim 1, wherein: the number of the isolation films is two, and the isolation films are arranged between the first pole piece (1) and the second pole piece (2) at intervals.

5. The utility model provides a battery core cutting device which characterized in that: the multi-lug battery cell structure comprises an upper pressing plate (5), a lower pressing plate (6) and a cutter (7), wherein a gap for pressing a bare battery cell (3) tightly is formed between the upper pressing plate (5) and the lower pressing plate (6), and the cutter (7) is used for cutting the bare battery cell (3) into the multi-lug battery cell structure according to any one of claims 1 to 4.

6. The cell cutting device according to claim 5, wherein: the upper pressing plate (5) and the lower pressing plate (6) are both provided with through holes (8) matched with the cutters (7), and the through holes (8) extend along the length direction (X).

7. The cell cutting device of claim 6, wherein: the through hole (8) forms a protrusion in the width direction (Y).

8. The cell cutting device according to claim 7, wherein: the section of the cutter (7) is of a convex structure or a concave structure.

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