CN214848730U

CN214848730U - Pole piece winding system

Info

Publication number: CN214848730U
Application number: CN202120695898.4U
Authority: CN
Inventors: 贺萌
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-11-23
Anticipated expiration: 2031-04-06

Abstract

The utility model discloses a pole piece is around package system belongs to battery technical field. The pole piece winding system comprises a positive pole piece winding section, a negative pole piece winding section and a diaphragm winding section arranged between the positive pole piece winding section and the negative pole piece winding section, wherein the positive pole piece and the negative pole piece are conveyed through the positive pole piece winding section and the negative pole piece winding section respectively and then are converged with the diaphragm to form a battery cell through winding; the positive plate rolling-in section is provided with an embossing roller, the surface of the embossing roller is provided with embossing patterns, and the embossing roller is arranged on the positive plate in a rolling manner so as to enable the surface of the positive plate to be provided with lines; and the negative plate coiling section is provided with a heating roller which can heat the negative plate so as to release the rebound of the negative plate. The utility model discloses a can be for negative pole piece bounce-back headspace to can release the part bounce-back of negative pole piece in advance, finally alleviate or avoid negative pole piece fold phenomenon, solve the pole piece of electric core super thick problem around rolling up the system.

Description

Pole piece winding system

Technical Field

The utility model relates to a battery technology field especially relates to a pole piece is around package system.

Background

The battery cell is an important unit for forming the battery, the positive plate, the diaphragm and the negative plate are tightly attached together after the battery cell is wound, and in the subsequent battery cell charging process, the negative plate can rebound, and the rebounding does not have a space to be effectively released, so that the negative plate can be folded, the problem of over thickness of part of the battery cell is solved, and the safety performance of the battery is seriously influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pole piece is around package system to solve among the prior art because the negative pole piece fold and the super thick problem of electric core that the negative pole piece bounce-back leads to.

To achieve the purpose, the utility model adopts the following technical proposal:

a pole piece winding system comprises a positive pole piece winding section, a negative pole piece winding section and a diaphragm winding section arranged between the positive pole piece winding section and the negative pole piece winding section, wherein the positive pole piece and the negative pole piece are conveyed through the positive pole piece winding section and the negative pole piece winding section respectively and then are joined with a diaphragm to form a battery cell through winding;

the positive plate rolling-in section is provided with an embossing roller, the surface of the embossing roller is provided with embossing patterns, and the embossing roller is arranged on the positive plate in a rolling manner so as to enable the surface of the positive plate to be provided with lines;

and the negative plate coiling section is provided with a heating roller which can heat the negative plate so as to release the rebound of the negative plate.

As an alternative to the above-mentioned pole piece winding system, the embossing roller is connected with a lifting drive mechanism.

As an alternative to the above-mentioned pole piece winding system, the embossed pattern comprises a hexagon, a triangle, a diamond or a rectangle.

As an alternative to the above-mentioned pole piece winding system, the embossing roller has a plurality of embossing rollers, and the embossing patterns on the surface of the plurality of embossing rollers are different.

As an alternative to the above pole piece winding system, the lifting driving mechanism is a telescopic cylinder.

As an alternative to the above-mentioned pole piece winding system, the lifting driving mechanism is of a rack and pinion structure.

As an alternative to the above-mentioned pole piece winding system, the embossing roller is disposed on the side of the positive pole piece close to the separator.

As an alternative to the above pole piece winding system, some or all of the guide rollers in the negative pole piece winding section are the heating rollers.

As an alternative of the above pole piece winding system, the heating roller is connected with a heating device, and the heating device is provided with a heating current control device to control the heating temperature of the heating roller.

As an alternative of the above pole piece winding system, the two heating rollers are in one group, the two heating rollers in each group are arranged oppositely, and the negative pole piece is clamped between the two heating rollers, so that both sides of the negative pole piece are heated uniformly.

The utility model discloses an useful part lies in: the utility model discloses a pole piece is around package system includes positive plate and goes into a roll section, negative pole piece and go into a roll section and diaphragm and go into a roll section, and positive plate goes into a roll section and is provided with the embossing roller, and the embossing roller can extrude the line on positive plate surface for after positive plate and diaphragm and negative pole piece are converged and are rolled up and form the electricity core, reserves out a part between positive plate and the diaphragm and supplies the space of negative pole piece bounce-back, alleviates or avoids negative pole piece fold phenomenon; meanwhile, the heating roller is arranged on the winding section of the negative plate and can heat the negative plate so as to release partial rebounding of the negative plate in advance and reduce the rebounding rate of the negative plate in the subsequent battery cell charging process; to sum up, the utility model discloses a go into the section of rolling up and set up the embossing roller and go into the mode that the section of rolling up set up the warming mill at the negative pole piece simultaneously at positive plate, reserve the space of negative pole piece bounce-back and release the part bounce-back of negative pole piece in advance between positive plate and diaphragm, finally alleviate or avoid negative pole piece fold phenomenon, solve electric core super-thick problem.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of a pole piece winding system according to the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of the pole piece winding system of the present invention;

fig. 3 is a schematic structural diagram of a third embodiment of the pole piece winding system of the present invention.

In the figure:

1. a positive plate; 2. a negative plate; 3. a diaphragm;

100. the positive plate is fed into a rolling section; 101. an embossing roll; 102. a lifting drive mechanism;

200. feeding the negative plate into a coiling section; 201. a heating roller;

300. and (4) a membrane rolling section.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The utility model provides a pole piece is around rolling up system, please refer to fig. 1, the pole piece is around rolling up system and is included that positive plate goes into roll section 100, negative pole piece goes into roll section 200 and diaphragm go into roll section 300. The positive plate winding section 100 is used for conveying a positive plate 1, the negative plate winding section 200 is used for conveying a negative plate 2, the diaphragm winding section 300 is used for conveying a diaphragm 3, the positive plate 1, the negative plate 2 and the diaphragm 3 are conveyed to a junction of the positive plate 1, the negative plate 2 and the diaphragm 3 through respective winding sections, and then the positive plate, the negative plate 2 and the diaphragm 3 are attached and wound to form an electric core. Since the separator 3 is to be interposed between the positive electrode sheet 1 and the negative electrode sheet 2 during winding, as shown in fig. 1, the negative electrode sheet winding section 200 and the positive electrode sheet winding section 100 are respectively disposed on the upper and lower sides of the separator winding section 300 in the vertical direction, that is, the separator winding section 300 is disposed between the negative electrode sheet winding section 200 and the positive electrode sheet winding section 100. In this embodiment, the negative electrode sheet winding segment 200 is located above and the positive electrode sheet winding segment 100 is located below, but in other embodiments, the positive electrode sheet winding segment 100 may be located above and the negative electrode sheet winding segment 200 may be located below, which is not limited herein.

Referring to fig. 1, the positive plate is rolled into section 100 and is provided with embossing roller 101, embossing roller 101 is provided with the knurling line on the surface, when the positive plate is rolled into section 100 and is carried positive plate 1, embossing roller 101 is pressed on positive plate 1, just so make 1 surface of positive plate through embossing roller 101 be extruded the line, it also makes 1 surface of positive plate produce sunkenly just to extrude the line on 1 surface of positive plate, thereby make and reserve the space that 2 bounce-backs of negative pole piece between 1 and the diaphragm 3 of positive plate, alleviate or avoid 2 fold phenomena of negative pole piece, solve the super thick problem of electric core.

Meanwhile, the embossing pattern designed on the embossing roller 101 is regular and uniform, so that the depression of the positive plate 1 is regular and uniform, the performance of the whole battery cell is uniform after the battery cell is formed by winding, the rebound quantity of the negative plate 2 at each position on the battery cell is uniform, and the problem that the thickness of a local groove is inconsistent with that of a part without the groove is solved.

As shown in fig. 1, the utility model discloses in, still go into at the negative pole piece and roll up section 200 and be provided with warming mill 201, warming mill 201 can heat negative pole piece 2, and the part of releasing negative pole piece 2 in advance is rebounded, further alleviates or avoids the 2 fold phenomena of negative pole piece, solves the super thick problem of electric core. That is to say, the utility model discloses in, adopt embossing roller 101 to press positive plate 1 and warming mill 201 to the mode that negative pole piece 2 heating combined, furthest avoids the emergence of the 2 fold phenomena of negative pole piece, avoids the super thick problem of back electric core that charges.

Fig. 2 is a schematic structural diagram of a second embodiment of the pole piece winding system of the present invention, referring to fig. 2, in an implementation manner, the embossing roller 101 is connected to a lifting driving mechanism 102, the lifting driving mechanism 102 can drive the embossing roller 101 to be close to or far away from the positive plate 1, and the embossing roller 101 can be controlled to press on the positive plate 1 or move away from the positive plate 1 by the driving of the lifting driving mechanism 102, so that the embossing roller 101 can be selectively used or not used, and the embossing depth can be controlled. Meanwhile, the maintenance or the replacement of the embossing roller 101 is facilitated, and when the embossing roller 101 needs to be replaced, the embossing roller 101 is driven by the lifting drive mechanism 102 to be away from the positive plate 1, so that the embossing roller 101 can be conveniently detached.

In addition, the embossed pattern path may be specifically selected according to needs, for example, the embossed pattern path may be a hexagon, a triangle, a diamond, or a rectangle, and may also be other shapes, which are not listed here.

Further, as shown in fig. 3, the embossing roll 101 is provided in a plurality of strips, and the embossing patterns on the surface of the plurality of embossing rolls 101 are different, so that the patterns to be embossed on the positive electrode sheet 1 can be selected. For example, as shown in fig. 3, two embossing rollers 101 are provided, and the driving device of the embossing roller 101 at the front end drives the embossing roller 101 to be close to the positive electrode sheet 1 and to be in contact with the positive electrode sheet 1, so that the embossing roller 101 can emboss textures on the positive electrode sheet 1; the drive device of the embossing roller 101 at the rear end drives the embossing roller 101 to be away from the positive plate 1 and to be separated from the positive plate 1, and the embossing roller 101 cannot press lines on the positive plate 1 at present. The two embossing rollers 101 can be provided with different patterns, so that when the embossing patterns need to be replaced, only different embossing rollers 101 need to be switched.

Fig. 3 schematically shows only two embossing rollers 101, and in other embodiments, the number and arrangement positions of the embossing rollers 101 can be adjusted, and are not limited herein. For example, the number may be one, or three or four. The plurality of emboss rollers 101 may be provided in sequence at one place or may be provided at a plurality of places at intervals.

The lift driving mechanism 102 for driving the embossing roller 101 may be a telescopic cylinder, or may be a rack and pinion structure. When the driving embossing roller 101 adopts an air cylinder, the cylinder body of the air cylinder is fixed on the pole piece winding system, and the piston rod of the air cylinder is connected with the embossing roller 101, so that the piston rod drives the embossing roller 101 to move linearly. When the lifting driving mechanism 102 adopts a gear-rack structure, the gear is fixed on the pole piece winding system, the gear is driven by the motor to rotate, the rack is connected with the embossing roller 101, the rack is matched with the gear, and when the gear rotates, the rack is driven to move linearly, so that the rack drives the embossing roller 101 to move.

Preferably, as shown in fig. 1, the embossing roller 101 is disposed on one side of the positive electrode sheet 1 close to the separator 3, so that the texture on the positive electrode sheet 1 is located between the positive electrode sheet 1 and the separator 3, and is closer to the negative electrode sheet 2, which is more effective.

Generally, referring to fig. 1, the pole pieces pass through a plurality of guide rollers during the transportation process, and there is a transportation roller and a turning roller, in one embodiment, all guide rollers in the negative pole piece winding section 200 are configured as a heating roller 201, that is, all guide rollers have a heating function and can heat the negative pole piece 2, so that the negative pole piece 2 can be heated during the whole transportation process, and the rebounding release is more complete. Of course, only a part of the guide roller may be provided as the heating roller 201.

It can be understood that, the heating roller 201 is connected with a heating device to make the heating roller 201 generate heat, the embodiment of the present invention provides a heating current control device arranged in the heating device, the heating current control device can control the magnitude of the heating current, thereby controlling the heating temperature of the heating roller 201, and making the heating temperature adjustable and controllable.

For promoting the homogeneity of heating efficiency and heating, the utility model discloses in, adopt the mode that all heats in 2 both sides of negative pole piece. As shown in fig. 1, two heating rollers 201 are a set, two heating rollers 201 of each set are arranged up and down oppositely, and the negative plate 2 is clamped between the two heating rollers 201, so that the two sides of the negative plate 2 are heated synchronously, the heating is more uniform, and the overall uniformity of the battery cell is improved.

The utility model discloses in, connect lift drive mechanism 102 with embossing roller 101 for embossing roller 101 is adjustable with positive plate 1's distance, thereby makes the degree of depth adjustable of embossing pattern way. In addition, the heating temperature of the heating roller 201 is set to be adjustable, so that the thickness of the negative electrode sheet 2 is adjustable, the heating temperature is increased if the negative electrode sheet 2 is thin, and the heating temperature is decreased if the negative electrode sheet 2 is thick. That is to say, the utility model discloses in, the degree of depth of knurling way and the thickness of negative pole piece 2 all can be adjusted, can satisfy the coiling of different model electricity cores.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The meaning of the above terms in the present invention can be understood by those of ordinary skill in the art as the case may be.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pole piece winding system is characterized by comprising a positive pole piece winding section (100), a negative pole piece winding section (200) and a diaphragm winding section (300) arranged between the positive pole piece winding section (100) and the negative pole piece winding section (200), wherein a positive pole piece (1) and a negative pole piece (2) are conveyed by the positive pole piece winding section (100) and the negative pole piece winding section (200) and then are joined with a diaphragm (3) to form a battery cell by winding;

the positive plate winding section (100) is provided with an embossing roller (101), the surface of the embossing roller (101) is provided with a pattern embossing circuit, and the embossing roller (101) is pressed on the positive plate (1) so that the surface of the positive plate (1) is embossed;

the negative plate coiling section (200) is provided with a heating roller (201), and the heating roller (201) can heat the negative plate (2) to release the rebound of the negative plate (2).

2. Pole piece winding system according to claim 1, characterized in that a lifting drive (102) is connected to the embossing roller (101).

3. The pole piece winding system of claim 2, wherein the embossed pattern comprises a hexagon, triangle, diamond, or rectangle.

4. The pole piece winding system according to claim 3, wherein the embossing roller (101) is a plurality of rollers, and the embossing pattern of the surface of the plurality of rollers (101) is different.

5. Pole piece winding system according to claim 3, characterized in that the lifting drive mechanism (102) is a telescopic cylinder.

6. The pole piece winding system according to claim 3, wherein the lifting drive mechanism (102) is a rack and pinion arrangement.

7. The pole piece winding system according to claim 1, wherein the embossing roller (101) is provided on the side of the positive pole piece (1) close to the separator (3).

8. The pole piece winding system according to claim 1, wherein some or all of the guide rollers of the negative pole piece winding section (200) are the heating roller (201).

9. The pole piece winding system according to claim 1, wherein a heating device is connected to the heating roller (201), and the heating device is provided with a heating current control device to control the heating temperature of the heating roller (201).

10. The pole piece winding system according to claim 1, wherein the two heating rollers (201) are in a group, the two heating rollers (201) of each group are arranged opposite to each other up and down, and the negative pole piece (2) is sandwiched between the two heating rollers (201) so that both sides of the negative pole piece (2) are heated uniformly.