CN215965763U

CN215965763U - Lithium battery pole piece die cutting die, die cutting equipment and lithium battery pole piece

Info

Publication number: CN215965763U
Application number: CN202122037732.6U
Authority: CN
Inventors: 李载波
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-03-08
Anticipated expiration: 2031-08-27

Abstract

The utility model belongs to the technical field of lithium battery production and manufacture, and particularly discloses a lithium battery pole piece die cutting die, die cutting equipment and a lithium battery pole piece thereof, wherein the die cutting die comprises an upper die and a lower die, the upper die comprises a first matrix, a second matrix and a third matrix, and the first matrix, the second matrix and the third matrix are of split structures; the upper end surface of the lower die comprises a first base surface and a second base surface, the first base surface is arranged on the periphery of the second base surface in a surrounding mode, and a die cutting part is arranged in the middle of the lower die; wherein, go up mould and lower mould and just align, second base member and the mutual butt of second base face, the second base member is used for compressing tightly the pole piece edge, and the third base member holding is in the cross cutting portion, and the third base member is used for the pole piece cross cutting, and first base member and the mutual butt of first base face, first base member are used for cutting the rim charge of pole piece, and it has solved the poor problem of pole piece cross cutting precision, and pole piece cross cutting precision is high, has improved lithium ion battery's capacity, has greatly reduced the probability that lithium cell analyzed lithium.

Description

Lithium battery pole piece die cutting die, die cutting equipment and lithium battery pole piece

Technical Field

The utility model belongs to the technical field of lithium battery production and manufacturing, and particularly relates to a die cutting die and die cutting equipment for a lithium battery pole piece and the lithium battery pole piece.

Background

After slurry coating, drying and rolling are carried out on the lithium ion battery pole piece, a three-layer composite structure of a current collector and two-side coatings is formed. And then cutting the pole piece according to the design structure and specification of the battery. Generally, for wound batteries, the pole pieces are stripped according to the design width; and (4) cutting the pole piece into pieces correspondingly for the laminated battery. At present, the cutting process of the lithium ion battery pole piece mainly adopts the following two processes of (1) die cutting; and (2) laser cutting.

The current lamination process has great limitation on the manufacturing process, the die cutting precision of a pole piece is poor, the influence on the battery cell Overhang level of the lamination structure is great, lithium dendrite is easily formed on the surface of a negative electrode of a lithium ion battery, a diaphragm is pierced, short circuit is caused in the battery, and thermal runaway is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: through providing a lithium battery pole piece cross cutting mould, cross cutting equipment and lithium battery pole piece thereof, solved the poor problem of pole piece cross cutting precision, pole piece cross cutting precision is high, has improved lithium ion battery's capacity, has greatly reduced the lithium cell and has educed the probability of lithium.

In order to achieve the purpose, the utility model adopts the following technical scheme: a die-cutting die for lithium battery pole pieces comprises an upper die and a lower die, wherein the upper die comprises a first base body, a second base body and a third base body, and the first base body, the second base body and the third base body are of split structures; the upper end surface of the lower die comprises a first base surface and a second base surface, the first base surface is arranged on the periphery of the second base surface in a surrounding mode, and a die cutting part is arranged in the middle of the lower die; the upper die and the lower die are aligned, the second base body and the second base surface are abutted with each other, the second base body is used for compressing the edge of a pole piece, the third base body is accommodated in the die cutting part and used for die cutting of the pole piece, the first base body and the first base surface are abutted with each other, and the first base body is used for cutting the rim charge of the pole piece.

Further, the third base body is movably connected with the second base body, and the upper end face of the third base body is higher than that of the second base body.

Further, the height difference between the third base body and the second base body is 2-8 mm.

Further, the first base surface is 2-5 mm lower than the second base surface.

Further, the die cutting part is a groove or a through hole.

Furthermore, the shape of the die cutting part is matched with the shape of the formed pole piece.

Further, the lower die comprises a first die body and a second die body, and the first die body and the second die body are integrally formed.

Furthermore, the first base surface is provided with a plurality of, the first base surface is distributed on the first die body, and the second base surface is an end face of the second die body.

A die cutting device comprises the lithium battery pole piece die cutting die.

A lithium battery pole piece is formed by die cutting of the die cutting equipment.

The utility model has the beneficial effects that: a die-cutting die for lithium battery pole pieces comprises an upper die and a lower die, wherein the upper die comprises a first base body, a second base body and a third base body, and the first base body, the second base body and the third base body are of split structures; the upper end surface of the lower die comprises a first base surface and a second base surface, the first base surface is arranged on the periphery of the second base surface in a surrounding mode, and a die cutting part is arranged in the middle of the lower die; the upper die and the lower die are aligned, the second base body and the second base surface are abutted with each other, the second base body is used for compressing the edge of the pole piece, the third base body is contained in the die cutting part and used for die cutting of the pole piece, the first base body and the first base surface are abutted with each other, and the first base body is used for cutting the rim charge of the pole piece. According to the die-cutting die for the lithium battery pole piece, the second base body is abutted against the second base face in advance, so that the edge of the pole piece is compressed, the pole piece is prevented from shifting, the third base body continuously moves downwards and is embedded into the die-cutting part, the edge of the third base body forms the cutter, so that the pole piece is cut and formed, meanwhile, the first base body moves downwards and is abutted against the first base face, the first base body generates a shearing force at the edge junction, so that the cutter is formed, leftover materials of the pole piece are divided into sections, the problem of poor die-cutting precision of the pole piece is solved, the die-cutting precision of the pole piece is high, the capacity of a lithium battery is improved, and the probability of lithium precipitation of the lithium battery is greatly reduced.

Drawings

FIG. 1 is a top view of an upper die in example 1 of the present invention;

FIG. 2 is a side view of an upper die in example 1 of the present invention;

FIG. 3 is a front view of an upper die in example 1 of the present invention;

FIG. 4 is a plan view of a lower mold in embodiment 1 of the present invention;

FIG. 5 is a side view of a lower die in example 1 of the present invention;

FIG. 6 is a front view of a lower mold in embodiment 1 of the utility model;

FIG. 7 is a die cut line drawing of the cathode plate as it is die cut;

FIG. 8 is a schematic view of die-cutting formation of a cathode plate;

fig. 9 is a die-cut line drawing of the anode sheet at the time of die-cutting.

Wherein: 1-upper mould; 11-a first substrate; 12-a second substrate; 13-a third substrate; 2-lower mould; 21-a first base surface; 22-a second base surface; 23-die cutting part; 3-die cutting line; 4-a cathode plate; 5-anode pole piece.

Detailed Description

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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 application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; unless specified or indicated otherwise, the terms "connected," "secured," and the like are to be construed broadly and include, for example, connections that may be flexible, removable, integral, or electrically connected; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning movably connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1

As shown in fig. 1 to 6, the die-cutting die for lithium battery pole pieces provided in embodiment 1 includes an upper die 1 and a lower die 2, where the upper die 1 includes a first base 11, a second base 12, and a third base 13, and the first base 11, the second base 12, and the third base 13 are in a split structure; the upper end surface of the lower die 2 comprises a first base surface 21 and a second base surface 22, the first base surface 21 is arranged around the periphery of the second base surface 22, and the middle part of the lower die 2 is provided with a die cutting part 23; the upper die 1 and the lower die 2 are aligned, the second base body 12 and the second base surface 22 are abutted with each other, the second base body 12 is used for pressing the edge of the pole piece, the third base body 13 is accommodated in the die cutting part 23, the third base body 13 is used for die cutting of the pole piece, the first base body 11 and the first base surface 21 are abutted with each other, and the first base body 11 is used for cutting the rim charge of the pole piece. According to the die-cutting die for the lithium battery pole piece, the second base body 12 is abutted against the second base surface 22 in advance so as to compress the edge of the pole piece and prevent the pole piece from shifting, the third base body 13 moves downwards and is embedded into the die-cutting part 23, the edge of the third base body 13 forms a cutter, so that the pole piece is cut and formed, meanwhile, the first base body 11 moves downwards and is abutted against the first base surface 21, the first base body 11 generates a shearing force at the edge junction, so that the cutter is formed, and the leftover material of the pole piece is divided into sections.

Preferably, the third base 13 is movably connected with the second base 12, the upper end face of the third base 13 is higher than the upper end face of the second base 12, and the height difference between the third base 13 and the second base 12 is 2-8 mm. The structural design enables the third substrate 13 to be embedded into the die cutting part 23, the outer edge of the third substrate 13 forms a cutter, the shape of the cutter can be a straight line or a curve, and the pole piece is cut and formed by cutting through the cutter.

Preferably, the first base surface 21 is 2 to 5mm lower than the second base surface 22. Due to the structural design, a height difference is formed between the first base surface 21 and the second base surface 22, and when the upper die 1 covers the upper end of the lower die 2, a cutter can be formed at the junction of the upper die 1 and the lower die 2, so that the pole piece is cut and molded.

Preferably, the die cut 23 is a groove or a through hole. The structural design enables a cutting knife to be formed at the junction of the third base body 13 and the die cutting part 23, so that the pole piece can be cut and formed.

Preferably, the die cut 23 and the shaped pole piece are shaped to match each other. This kind of structural design has reduced the fashioned degree of difficulty of pole piece shear, and the formation of being convenient for shear, and only through once shearing, can make the pole piece shear shaping, need not to cut repeatedly, has improved the shearing precision.

Preferably, the lower mold 2 includes a first mold body and a second mold body, the first mold body and the second mold body are integrally formed, the first base surfaces 21 are provided in plurality, the first base surfaces 21 are distributed on the first mold body, and the second base surface 22 is an end surface of the second mold body. This kind of structural design, the manufacturing of being convenient for, simultaneously, need not to assemble lower mould 2, avoided the equipment cooperation precision poor, lead to the big problem of pole piece shearing error.

Example 2

The die cutting equipment provided by the embodiment 2 comprises the die cutting die for the lithium battery pole piece in the embodiment 1.

Example 3

The lithium battery pole piece provided by the embodiment 3 is formed by die cutting of the die cutting equipment in the embodiment 2. A lithium battery pole piece is characterized in that the specific shearing process is as follows:

step 1, a former process: coating, rolling and cutting according to the lamination process requirement;

step 2, die cutting of the pole pieces: by using the die cutting equipment in the embodiment 2, the lower die 2 is provided with two die cutting parts 23, and the upper die 1 is correspondingly arranged, so that the pole pieces are die-cut pairwise into single pieces, two pieces are die-cut each time, and the leftover materials of the pole pieces are simultaneously cut into sections, so that the leftover materials are more easily fallen and recovered, and the leftover material cutting mode is linear cutting, curve cutting and the like;

and 3, carrying out subsequent processes such as lamination and the like on the die-cut pole piece.

Compared with the existing die cutting process, the die cutting process has the following advantages:

1. the die cutting precision of the pole piece is improved, and the battery capacity is increased;

2. the pole piece is cut and formed at one time, so that the cutting step and the cutting difficulty are reduced, and the time for changing the model of the die is shortened;

3. can set up a plurality of cross cutting portions 23 as required to realize the synchronous cross cutting of a plurality of pole pieces, improve cross cutting efficiency.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

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 improvement, replacement or modification made by those skilled in the art based on the present invention is 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

1. The utility model provides a lithium battery pole piece cross cutting mould which characterized in that: comprises that

The mould comprises an upper mould (1), wherein the upper mould (1) comprises a first base body (11), a second base body (12) and a third base body (13), and the first base body (11), the second base body (12) and the third base body (13) are of split structures;

the upper end face of the lower die (2) comprises a first base face (21) and a second base face (22), the first base face (21) is arranged on the periphery of the second base face (22) in a surrounding mode, and a die cutting portion (23) is arranged in the middle of the lower die (2);

the upper die (1) and the lower die (2) are aligned, the second base body (12) and the second base surface (22) are abutted, the second base body (12) is used for pressing the edge of a pole piece, the third base body (13) is accommodated in the die cutting part (23), the third base body (13) is used for die cutting of the pole piece, the first base body (11) and the first base surface (21) are abutted, and the first base body (11) is used for cutting the rim charge of the pole piece.

2. The die-cutting die for the lithium battery pole piece as claimed in claim 1, wherein: the third base body (13) is movably connected with the second base body (12), and the upper end face of the third base body (13) is higher than that of the second base body (12).

3. The die-cutting die for the lithium battery pole piece as claimed in claim 2, wherein: the height difference between the third base body (13) and the second base body (12) is 2-8 mm.

4. The die-cutting die for the lithium battery pole piece as claimed in claim 3, wherein: the first base surface (21) is lower than the second base surface (22) by 2-5 mm.

5. The die-cutting die for the lithium battery pole piece as claimed in claim 1, wherein: the die cutting part (23) is a groove or a through hole.

6. The die-cutting die for the lithium battery pole piece as claimed in claim 1, wherein: the shape of the die cutting part (23) is matched with the shape of the formed pole piece.

7. The die-cutting die for the lithium battery pole piece as claimed in claim 1, wherein: the lower die (2) comprises a first die body and a second die body, and the first die body and the second die body are integrally formed.

8. The die-cutting die for the lithium battery pole piece as claimed in claim 7, wherein: the number of the first base surfaces (21) is multiple, the first base surfaces (21) are distributed on the first mold body, and the second base surface (22) is one end face of the second mold body.

9. A die cutting device is characterized by comprising the lithium battery pole piece die cutting die as claimed in any one of claims 1 to 8.

10. A lithium battery pole piece, characterized in that it is die-cut by the die-cutting apparatus of claim 9.