CN211017271U

CN211017271U - Composite roll core

Info

Publication number: CN211017271U
Application number: CN201922464500.1U
Authority: CN
Inventors: 宋庆彬; 白科; 孙玉龙; 游杰; 陈富源
Original assignee: Jiangxi ANC New Energy Technology Co Ltd
Current assignee: Jiangxi ANC New Energy Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-07-14
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a compound book core, include: winding a bare cell, wherein the bare cell consists of a positive plate, a negative plate and a diaphragm; the negative pole in the middle of rolling up naked electric core is to the centre of negative pole, increases by the naked electric core of 5 to 15 layers of lamination. The naked electric core of lamination comprises positive plate, diaphragm and negative pole piece, and specific structure is that the diaphragm is in the outside, and the back is positive plate, diaphragm, secondly is the negative pole piece, is diaphragm, positive plate once more, so circulation. The winding naked electric core is connected with the lamination naked electric core through a pole ear to form a composite naked electric core. Through the structure that increases the naked electric core of lamination in the middle of the naked electric core of coiling, the pole piece bend radius of the naked electric core inlayer of coiling increases several times for the pole piece of compound naked electric core inlayer is more in the same direction as smooth bending when the hot pressing, can not produce the rupture. The naked electric core of lamination makes the capacity of coiling the two sides pole piece of rolling up the core inner layer can exert, plays the effect that improves electric core energy density. The production process is simple and is beneficial to mass production.

Description

Composite roll core

Technical Field

The utility model relates to a naked electric core technical field specifically is a compound book core that rolls up.

Background

The structure of the naked electric core at present has two structures of lamination and coiling. The naked electric core production efficiency of winding structure is high, and winding speed is fast, and the naked electric core that the pole piece that adopts continuous coating technique was made is close to intermediate level pole piece hot pressing process, and the bend radius of pole piece is very little, and the pole piece is very easy to be split, and the split is more serious when making the core that rolls up of high surface density coating. And because the surfaces with the same polarity of the pole pieces of the middle layer are corresponding together, the capacity cannot be exerted, and the energy density of the battery cell is low. The naked electric core of lamination structure can improve energy density, but the production efficiency of lamination electricity core is extremely low, when making thicker book core, the inefficiency is updated obviously, leads to electric core manufacturing cost high, has reduced the competitiveness of battery.

Therefore, a composite winding core is needed, the small bending radius of the positive and negative pole pieces in the middle of the bare cell is avoided, and the risk of being broken by pressure is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound book core through the structure that increases the naked electric core of lamination in the middle of the naked electric core of coiling, and the pole piece bending radius of the naked electric core inlayer of coiling increases several times for compound naked electric core pole piece relatively smooth-going bending of inlayer when the hot pressing. Simultaneously, because the addition of the naked electric core of lamination, the capacity of the two-sided pole piece of the core inlayer is rolled up in the coiling can exert, plays the effect that improves electric core energy density to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a compound book core comprises the naked electric core of book and the naked electric core of lamination, roll up naked electric core and form by first negative pole piece, first positive plate and first diaphragm coiling, keep apart through first diaphragm in the middle of first negative pole piece and the first positive plate.

Preferably, the first negative electrode sheet is formed by rolling slurry made of active material graphite, conductive agent SP and binder CMC, the innermost circle is the first negative electrode sheet, and the thickness of the negative electrode sheet is 0.07mm-0.4 mm.

Preferably, the first positive plate is formed by rolling slurry made of lithium iron phosphate, a carbon nanotube and vinylidene fluoride, and the thickness of the first positive plate is 0.1mm-0.5 mm.

Preferably, the naked electric core of lamination comprises second negative pole piece, the positive plate of second and the stack of second diaphragm, second negative pole piece, the positive plate of second are kept apart by the second diaphragm, the naked electric core both ends of lamination are passed through utmost point ear and are connected.

Preferably, the naked electric core of lamination comprises second positive plate and the second negative pole piece that the total number of piles is 5 to 15 layers, and all is provided with the second diaphragm between second positive plate and the second negative pole piece.

Preferably, the outermost layer of the naked electric core of lamination is the second diaphragm, and the back is the positive plate of second, second diaphragm, and the second is the negative plate of second, and the second is the positive plate of second diaphragm, second again, so circulate, both ends and negative plate polarity are opposite.

Compared with the prior art, the beneficial effects of the utility model are that:

this application compares with current naked electric core structure, through the structure that increases the naked electric core of lamination in the middle of the naked electric core of coiling, the pole piece bend radius of the naked electric core inlayer of coiling increases several times for compound naked electric core pole piece relatively smooth-going bending of inlayer when the hot pressing, and the inner circle is because the joining of lamination electricity core, bend radius grow, and the pole piece is no longer broken can not produce the rupture. Simultaneously, because the addition of the naked electric core of lamination, the capacity of coiling the two sides pole piece of rolling up the core inlayer can exert, plays the effect that improves electric core energy density. The production process is simple and is beneficial to mass production.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the laminated bare cell of the present invention;

fig. 3 is a schematic structural view of the bare cell of the present invention;

in the figure: 1. winding the bare cell; 2. laminating the bare cell; 3. a first negative plate; 4. a first positive plate; 5. a first diaphragm; 6. a second positive plate; 7. a second negative plate; 8. a second diaphragm; 9. a bending section; 10. and (7) a tab.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: this compound book core includes: the laminated bare cell 2 is composed of a second positive plate 6, a second negative plate 7 and a second diaphragm 8; the winding method comprises the following steps of winding a bare cell 1, wherein the winding bare cell 1 consists of a first positive plate 4, a first negative plate 3 and a first diaphragm 5; the two ends of the laminated naked electric core 2 are connected through tabs and wound inside the coiled naked electric core 1.

Naked electric core 2 of lamination comprises second positive plate 6 and second negative pole piece 7 that the total number of piles is 5 to 15 layers, and all is provided with second diaphragm 8 between second positive plate 6 and the second negative pole piece 7. The two ends of the naked electric core 2 of lamination are connected through tabs 10, the outermost layer is a second diaphragm 8, and then a second positive plate 6 and a second diaphragm 8, and then a second negative plate 7 and a second diaphragm 8 are circulated.

This application compares with current naked electric core structure, through the structure that increases naked electric core 2 of lamination in the middle of rolling up naked electric core 1, rolls up the pole piece bend radius several times of naked electric core 1 inlayer and increases for compound naked electric core pole piece relatively smooth-going bending of inlayer when the hot pressing, and the inner circle is because the joining of the naked electric core 2 of lamination, bend radius grow, and the pole piece can not produce the rupture by the rupture again. Simultaneously, because the addition of naked electric core 2 of lamination, the capacity of coiling the two sides pole piece of rolling up the core inlayer can exert, plays the effect that improves electric core energy density. As shown in fig. 3, the bending portion 9 without the lamination bare cell 2 is easily pressed, and has a small bending radius and is easily broken.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a compound core of rolling up which characterized in that:

the composite battery cell comprises a winding bare cell (1) and a lamination bare cell (2), wherein the winding bare cell (1) is formed by winding a first negative plate (3), a first positive plate (4) and a first diaphragm (5), and the first negative plate (3) and the first positive plate (4) are isolated by the first diaphragm (5); all pole pieces of the winding bare cell (1) and the lamination bare cell (2) are structurally connected through a pole lug (10).

2. The composite winding core of claim 1, wherein: the first negative plate (3) is formed by rolling slurry made of active material graphite, a conductive agent SP and a binder CMC, the innermost circle of the coiled bare cell (1) is the first negative plate (3), and the thickness of the first negative plate (3) is 0.07mm-0.4 mm.

3. The composite winding core of claim 1, wherein: the first positive plate (4) is formed by rolling slurry made of lithium iron phosphate, a carbon nano tube and vinylidene fluoride, and the thickness of the slurry is 0.1-0.5 mm.

4. The composite winding core of claim 1, wherein: naked electric core (2) of lamination is overlapped by second negative pole piece (7), the positive plate of second (6) and second diaphragm (8) and is formed, keep apart through second diaphragm (8) between second negative pole piece (7), the positive plate of second (6), the both ends of the naked electric core of lamination (2) are passed through utmost point ear (10) structural connection.

5. The composite winding core according to claim 4, wherein: the number of the superposed pole pieces of the second positive pole piece (6), the second negative pole piece (7) and the second diaphragm (8) is 5-15.

6. The composite winding core according to claim 4, wherein: the outermost second diaphragm (8) that is of naked electric core (2) of lamination, the back is second positive plate (6), second diaphragm (8), secondly is second negative pole piece (7), is second diaphragm (8), second positive plate (6) again, so circulation, and the pole piece at the upper and lower both ends of naked electric core (2) of lamination is opposite with the polarity of first negative pole piece (3).