CN114865057A

CN114865057A - Battery cell pole group, battery cell, lamination method, and manufacturing method and equipment of lamination unit

Info

Publication number: CN114865057A
Application number: CN202210416494.6A
Authority: CN
Inventors: 秦洁; 尹东星; 徐春龙; 王学飞
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-08-05

Abstract

The invention discloses a battery cell pole group, a battery cell, a lamination method and equipment, and a manufacturing method and equipment of a lamination unit. This electric core utmost point group includes: the first lamination unit comprises a first pole piece, a second pole piece and a first pole piece which are sequentially stacked, and a diaphragm is arranged between the second pole piece and the first pole piece; the second lamination unit comprises a second pole piece, a first pole piece and a second pole piece which are sequentially stacked, and a diaphragm is arranged between the first pole piece and the second pole piece; one first lamination unit is a head end lamination unit, the second lamination units and the first lamination units are alternately stacked, a diaphragm is arranged between the first pole piece and the adjacent second pole piece, and the outermost pole piece stacked on the last second lamination unit is a tail end lamination unit of the first pole piece. According to the battery core pole group, the first lamination unit, the second lamination unit and the tail end lamination unit which are prefabricated are stacked according to the preset stacking mode, so that the lamination speed can be increased, and the production efficiency of the battery core pole group is improved.

Description

Battery cell pole group, battery cell, lamination method, and manufacturing method and equipment of lamination unit

Technical Field

The invention relates to the technical field of battery manufacturing, in particular to a battery cell pole group, a battery cell, a lamination method of the battery cell pole group, lamination equipment, a manufacturing method of a lamination unit and lamination unit manufacturing equipment.

Background

The related manufacturing technology of the lithium ion battery is a key technology for the development of the electric automobile. The lamination technology is one of the most advanced lithium ion battery manufacturing technologies, wherein the lamination speed directly determines the whole line productivity and the cell manufacturing cost.

At present, a Z-type lamination technology is mostly adopted, the lamination speed of lamination equipment which is produced in mass production at present is 0.9-1 s/piece, the lamination method is slow, the problems of large equipment number demand, large occupied area, high acquisition cost, high later maintenance cost, high energy consumption and the like are caused, and in addition, in the process of carrying out Z-type lamination on a long battery cell, due to the reasons of tension change of a diaphragm and the like, diaphragm wrinkles are easily generated, can cause short circuit of a battery, and have safety problems.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides a battery cell pole group which can improve the lamination speed.

The invention also provides a battery cell comprising the battery cell pole group.

The invention also provides a lamination method for the battery cell pole group.

The invention also provides lamination equipment used for the lamination method of the battery cell pole group.

The invention further provides a manufacturing method of the lamination unit for manufacturing the battery cell pole group.

The invention further provides lamination unit manufacturing equipment used in the lamination unit manufacturing method.

The cell pole group according to the embodiment of the invention comprises: the first lamination unit comprises a first pole piece, a second pole piece and a first pole piece which are sequentially stacked, a diaphragm is arranged between the second pole piece and the adjacent first pole piece, and a diaphragm is arranged on one side of one first pole piece, which is far away from the second pole piece; the second lamination unit comprises second pole pieces, first pole pieces and second pole pieces which are sequentially stacked, a diaphragm is arranged between each first pole piece and the adjacent second pole piece, and a diaphragm is arranged on one side, away from the first pole piece, of one second pole piece; one of them first lamination unit is head end lamination unit, second lamination unit with first lamination unit piles up in turn, first pole piece and adjacent be equipped with the diaphragm between the second pole piece, and the last one end lamination unit is piled up on the second lamination unit, the outmost pole piece of end lamination unit is first pole piece.

According to the battery cell pole group provided by the embodiment of the invention, the first lamination unit, the second lamination unit and the tail end lamination unit are prefabricated, and then the first lamination unit, the second lamination unit and the tail end lamination unit are stacked according to the preset stacking mode, so that the lamination speed can be increased, and the production efficiency of the battery cell pole group is improved.

According to some embodiments of the invention, the end lamination unit is the first lamination unit.

According to some embodiments of the invention, the end lamination unit is an auxiliary lamination unit comprising a first pole piece and a diaphragm located on both sides of the first pole piece.

According to some embodiments of the invention, the first pole piece is a negative pole piece and the second pole piece is a positive pole piece.

According to some embodiments of the invention, the length of the first pole piece is 1.01 to 1.1 times the length of the second pole piece.

According to some embodiments of the invention, the edge of the membrane is 1mm to 5mm further outward than the edge of the pole piece adjacent to the membrane.

The battery cell comprises a battery cell shell and the battery cell pole group, wherein the length of the battery cell is 200 mm-2800 mm, the width of the battery cell is 90 mm-300 mm, the thickness of the battery cell is 10 mm-60 mm, the length-thickness ratio of the battery cell is 3-280, the battery cell shell is an aluminum shell, and the thickness of the battery cell shell is 0.1 mm-1 mm.

According to some embodiments of the invention, the length of the battery cell is 200mm to 600mm, the width of the battery cell is 120mm to 140mm, the thickness of the battery cell is 12mm to 50mm, and the length-thickness ratio of the battery cell is 4 to 50.

According to the lamination method of the cell pole group in the embodiment of the third aspect of the present invention, the cell pole group is the above cell pole group, and the lamination method includes the following steps:

s01: taking one of the first lamination units as a head-end lamination unit, and alternately stacking the second lamination units and the first lamination units;

s02: stacking said end lamination units on the last of said second lamination units.

According to some embodiments of the invention, the lamination efficiency of the cell pole group is 700PPM to 1600 PPM.

According to the lamination method of the battery cell pole group, the first lamination unit, the second lamination unit and the tail end lamination unit which are prefabricated are stacked according to the preset stacking mode, the lamination speed can be increased, and therefore the production efficiency of the battery cell pole group is improved.

According to the lamination device in the fourth aspect of the present invention, the lamination method of the cell pole group is to perform lamination through the lamination device, and the lamination device includes:

the first lamination unit is positioned on the first conveying mechanism;

a first deviation rectifying table;

the first conveying mechanism is used for conveying the first lamination unit on the first conveying mechanism to the first deviation rectifying table for position deviation rectification;

a second conveyor on which the second lamination unit is located;

a second deviation rectifying table;

the second carrying mechanism is used for carrying the second lamination unit to the second deviation rectifying table for position deviation rectification;

the first carrying mechanism is further used for carrying the first lamination unit on the first deviation rectifying table to the lamination table, the second carrying mechanism is further used for carrying the second lamination unit on the second deviation rectifying table to the lamination table, the first lamination unit and the second lamination unit are stacked alternately, and the first carrying mechanism or the second carrying mechanism or the auxiliary carrying mechanism is further used for carrying the tail end lamination unit to the last second lamination unit.

According to the laminating equipment provided by the embodiment of the invention, the first laminating unit is subjected to position correction on the first correction table, the second laminating unit is subjected to position correction on the second correction table, and the first laminating unit and the second laminating unit are alternately stacked on the laminating table, so that the laminating speed is favorably improved, and the production efficiency of the battery core pole group is improved.

According to some embodiments of the invention, the first handling mechanism handles a plurality of the first lamination units simultaneously, and the second handling mechanism handles a plurality of the second lamination units simultaneously, so as to form a plurality of the cell pole groups simultaneously.

According to some embodiments of the invention, the conveying direction of the first and second conveying mechanisms is perpendicular to the conveying direction of the first and second conveying mechanisms.

According to some embodiments of the invention, the first conveying mechanism, the second conveying mechanism, the first deviation rectifying table, the second deviation rectifying table and the lamination table are located at the same end of the first conveying mechanism and the second conveying mechanism, and the lamination table is located between the first deviation rectifying table and the second deviation rectifying table.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a lamination unit, for manufacturing the above-mentioned battery pole group, the method comprising the steps of:

s11: cutting a first pole piece roll into a plurality of first pole pieces, covering a first diaphragm on one side of each first pole piece, and covering a second diaphragm on the other side of each first pole piece;

s12: rolling the first diaphragm, the first pole piece and the second diaphragm;

s13: cutting an intermediate pole piece roll into a plurality of intermediate pole pieces, placing the intermediate pole pieces on the second diaphragm, and aligning at least part of the intermediate pole pieces with the first pole piece;

s14: covering the middle pole piece with a third diaphragm;

s15: rolling the first diaphragm, the first pole piece, the second diaphragm, the middle pole piece and the third diaphragm;

s16: cutting an end-tensioned sheet roll into a plurality of end-tensioned sheets, placing the end-tensioned sheets on the third diaphragm, and aligning at least part of the end-tensioned sheets with the middle sheet;

s17: rolling the first diaphragm, the first pole piece, the second diaphragm, the middle pole piece, the third diaphragm and the last pole piece;

s18: and performing edge sealing treatment and cutting to form a lamination unit.

According to the manufacturing method of the lamination unit, the lamination unit comprising the three pole pieces can be obtained by adopting the steps, and the corresponding first lamination unit and second lamination unit can be obtained by reasonably selecting the polarities of the first pole piece, the middle pole piece and the last pole piece, so that the lamination unit can be conveniently and subsequently applied to the production and the manufacture of the battery cell pole group.

Before one side of the first pole piece is covered with a first diaphragm, glue is coated between the first diaphragm and the first pole piece; and before the other side of the first pole piece is covered with a second diaphragm, gluing is carried out between the second diaphragm and the first pole piece.

According to some embodiments of the present invention, in the S13, when the middle pole piece is placed on the second diaphragm, glue is applied between the middle pole piece and the second diaphragm; after the S13 and before the S14, further comprising S131: and gluing between the third diaphragm and the middle pole piece.

According to some embodiments of the invention, the gluing is performed by: gluing on the corresponding diaphragm; or, gluing on the corresponding pole piece; or, prefabricating a glue layer on the corresponding diaphragm; or, prefabricating an adhesive layer on the corresponding pole piece.

According to some embodiments of the invention, after the S15 and before the S16, further comprising S151: detecting the alignment degree of the middle pole piece and the first pole piece;

after the S17 and before the S18, further comprising S171: and detecting the alignment degree of the end pole piece and the middle pole piece.

According to some embodiments of the present invention, in S18, after the edge sealing process and before the cutting process, a short circuit test is performed.

The first pole piece and the last pole piece are first pole pieces, and the middle pole piece is a second pole piece; or the first pole piece and the last pole piece are second pole pieces, and the middle pole piece is a first pole piece.

According to some embodiments of the invention, the rolling temperature is 40 ℃ to 90 ℃ and the roll pressure is 20MPa to 70 MPa.

According to some embodiments of the invention, the deciding is by: mechanical severing is achieved by laser severing or by cutting.

According to the lamination unit manufacturing apparatus of the embodiment of the sixth aspect of the present invention, the above lamination unit manufacturing method is manufactured by the lamination unit manufacturing apparatus, which includes:

the first pole piece roll is wound on the first unwinding mechanism;

the first cutting mechanism is positioned at the downstream of the first unwinding mechanism and is used for cutting the first pole piece roll unwound by the first unwinding mechanism into the first pole piece;

the first diaphragm unwinding mechanism is wound with a first diaphragm roll, the first diaphragm unwinding mechanism is positioned at the downstream of the first cutting mechanism, and a first diaphragm unwound by the first diaphragm unwinding mechanism is positioned at one side of the first pole piece;

the second diaphragm unwinding mechanism is wound with a second diaphragm roll, the second diaphragm unwinding mechanism is positioned at the downstream of the first cutting mechanism, and a second diaphragm unwound by the second diaphragm unwinding mechanism is positioned at the other side of the first pole piece;

the first rolling mechanism is positioned at the downstream of the first diaphragm unwinding mechanism and the second diaphragm unwinding mechanism and is used for rolling the first diaphragm, the first pole piece and the second diaphragm which pass through the first rolling mechanism;

the second unwinding mechanism is provided with the middle pole piece roll in a winding manner;

the second cutting mechanism is used for cutting the intermediate pole piece roll unreeled by the second unreeling mechanism into the intermediate pole piece, and the intermediate pole piece is stacked on the second diaphragm;

the third diaphragm unwinding mechanism is wound with a third diaphragm roll, the third diaphragm unwinding mechanism is positioned at the downstream of the second cutting mechanism, and a third diaphragm unwound by the third diaphragm unwinding mechanism is positioned on one side, away from the second diaphragm, of the middle pole piece;

the second rolling mechanism is positioned at the downstream of the third diaphragm unwinding mechanism and is used for rolling the first diaphragm, the first pole piece, the second diaphragm, the middle pole piece and the third diaphragm which pass through the second rolling mechanism;

the third unwinding mechanism is wound with the tail pole piece roll;

the third cutting mechanism is positioned at the downstream of the third unwinding mechanism and used for cutting the final pole piece roll unwound by the third unwinding mechanism into the final pole piece, and the final pole piece is stacked on the third diaphragm;

the third rolling mechanism is positioned at the downstream of the third diaphragm unwinding mechanism and is used for rolling the first diaphragm, the first pole piece, the second diaphragm, the middle pole piece, the third diaphragm and the last pole piece which pass through the third rolling mechanism;

a sealing mechanism located downstream of the second diaphragm and configured to seal the first diaphragm, the first pole piece, the second diaphragm, the middle pole piece, the third diaphragm, and the last pole piece;

the fourth is decided the mechanism, the fourth is decided the mechanism and is located banding mechanism's low reaches and is used for deciding each layer diaphragm in order to form lamination unit.

According to the lamination unit manufacturing equipment provided by the embodiment of the invention, the lamination unit comprising three layers of pole pieces can be obtained, and the corresponding first lamination unit and second lamination unit can be obtained by reasonably selecting the polarities of the first pole piece, the middle pole piece and the last pole piece, so that the lamination unit can be conveniently applied to the production and the manufacture of a battery cell pole group in the follow-up process.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic diagram of a cell pole group according to one embodiment of the present invention;

fig. 2 is a schematic diagram of a cell pole group according to another embodiment of the invention;

FIG. 3 is a schematic view of a first pole piece;

FIG. 4 is a schematic view of a second pole piece;

FIG. 5 is a schematic view of an auxiliary lamination unit;

fig. 6 is a schematic diagram of a lamination method of a cell pole group according to an embodiment of the present invention;

FIG. 7 is a schematic view of a lamination apparatus according to an embodiment of the present invention;

fig. 8 is a schematic view of simultaneously forming a plurality of cell pole groups;

FIG. 9 is a schematic illustration of a method of manufacturing a lamination unit according to one embodiment of the invention;

FIG. 10 is a schematic view of a method of manufacturing a lamination unit according to another embodiment of the invention;

FIG. 11 is a schematic view of a lamination unit manufacturing apparatus according to one embodiment of the present invention;

fig. 12 is a schematic perspective view of a battery cell according to an embodiment of the invention;

fig. 13 is a side view of a cell according to an embodiment of the invention.

Reference numerals are as follows:

the battery cell comprises a battery cell pole group 100, a first lamination unit 10, a first pole piece 1, a second pole piece 2, a diaphragm 3, a first diaphragm 31, a second diaphragm 32, a third diaphragm 33, a first pole piece 4, a middle pole piece 5, a last pole piece 6, a glue layer 7, a second lamination unit 20, an auxiliary lamination unit 30, a head end lamination unit 40 and a tail end lamination unit 50;

the device comprises a lamination device 200, a first conveying mechanism 201, a second conveying mechanism 202, a first deviation rectifying table 203, a lamination table 204, a second deviation rectifying table 205 and an auxiliary table;

the lamination unit manufacturing equipment 300, a first unwinding mechanism 301, a first cutting mechanism 302, a first diaphragm unwinding mechanism 303, a second diaphragm unwinding mechanism 304, a first rolling mechanism 305, a second unwinding mechanism 306, a second cutting mechanism 307, a third diaphragm unwinding mechanism 308, a second rolling mechanism 309, a third unwinding mechanism 310, a third cutting mechanism 311, a third rolling mechanism 312, a sealing mechanism 313, a fourth cutting mechanism 314, a first detection unit 315, a second detection unit 316, a short circuit testing mechanism 317, a first gluing mechanism 318, a second gluing mechanism 319, a third gluing mechanism 320, a fourth gluing mechanism 321, a rejection mechanism 322, a first laser mechanism 323, a second laser mechanism 324 and a third laser mechanism 325;

the battery comprises a battery cell 400, a positive pole column 401, a negative pole column 402, an explosion-proof valve 403, a liquid injection hole 404 and a battery cell shell 405.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; 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 by those skilled in the art according to specific situations.

A cell pole group 100, a cell 400, a lamination method of the cell pole group 100, a lamination apparatus 200, a lamination unit manufacturing method, and a lamination unit manufacturing apparatus 300 according to embodiments of the present invention are described in detail below with reference to fig. 1 to 13.

Referring to fig. 1 to 5, a cell pole group 100 according to an embodiment of the present invention may include a first lamination unit 10 and a second lamination unit 20.

Referring to fig. 3, the first lamination unit 10 may include a first pole piece 1, a second pole piece 2, and a first pole piece 1, where the first pole piece 1, the second pole piece 2, and the first pole piece 1 are stacked in sequence, a diaphragm 3 is disposed between the second pole piece 2 and the adjacent first pole piece 1, and a diaphragm 3 is disposed on one side of one of the first pole pieces 1, which is away from the second pole piece 2. For example, as shown in fig. 3, in a bottom-up direction, the first lamination unit 10 sequentially includes a first diaphragm 31, a first pole piece 1, a second diaphragm 32, a second pole piece 2, a third diaphragm 33, and a first pole piece 1, and the first diaphragm 31 is located on a side of the first pole piece 1 below, the side facing away from the second pole piece 2. Glue layers 7 are arranged between the first diaphragm 31 and the first pole piece 1 below, between the second diaphragm 32 and the second pole piece 2, between the third diaphragm 33 and the second pole piece 2, and between the third diaphragm 33 and the first pole piece 1 above, so that the first diaphragm 31, the first pole piece 1, the second diaphragm 32, the second pole piece 2, the third diaphragm 33 and the first pole piece 1 above are bonded.

Referring to fig. 4, the second lamination unit 20 includes a second pole piece 2, a first pole piece 1, and a second pole piece 2, where the second pole piece 2, the first pole piece 1, and the second pole piece 2 are stacked in sequence, a diaphragm 3 is disposed between the first pole piece 1 and the adjacent second pole piece 2, and a diaphragm 3 is disposed on one side of one of the second pole pieces 2 away from the first pole piece 1. For example, as shown in fig. 4, in a bottom-up direction, the second lamination unit 20 sequentially includes a first diaphragm 31, a second pole piece 2, a second diaphragm 32, a first pole piece 1, a third diaphragm 33, and a second pole piece 2, and the first diaphragm 31 is located on a side of the second pole piece 2 below and away from the first pole piece 1. Glue layers 7 are arranged between the first diaphragm 31 and the lower second pole piece 2, between the second diaphragm 32 and the first pole piece 1, between the third diaphragm 33 and the first pole piece 1, and between the third diaphragm 33 and the upper second pole piece 2, so that the first diaphragm 31, the second pole piece 2, the second diaphragm 32, the first pole piece 1, the third diaphragm 33 and the second pole piece 2 are bonded.

With reference to fig. 1 to 5, one of the first lamination units 10 is a head-end lamination unit 40, and the second lamination units 20 and the first lamination units 10 are alternately stacked, when stacking, it is ensured that a diaphragm 3 is disposed between the first pole piece 1 and the adjacent second pole piece 2, and a tail-end lamination unit 50 is stacked on the last second lamination unit 20, and an outermost pole piece of the tail-end lamination unit 50 is the first pole piece 1, so that outermost pole pieces at two ends of the cell pole group 100 are both the first pole pieces 1.

It will be appreciated that the ends of first lamination unit 10, second lamination unit 20, and end lamination unit 50 each have a tab in communication with a pole piece to facilitate electrical connection between first lamination unit 10, second lamination unit 20, and end lamination unit 50.

According to the cell pole group 100 of the embodiment of the invention, the first lamination unit 10, the second lamination unit 20 and the end lamination unit 50 are prefabricated, and then the first lamination unit 10, the second lamination unit 20 and the end lamination unit 50 are stacked according to a preset stacking mode, so that the lamination speed can be increased, and the production efficiency of the cell pole group 100 can be improved.

In some embodiments of the present invention, as shown in fig. 1, 3, end lamination unit 50 is first lamination unit 10. The outer pole piece of the first lamination unit 10 is the first pole piece 1, so when the head-end lamination unit 40 and the tail-end lamination unit 50 are both the first lamination unit 10, it can be ensured that the outermost pole pieces at both ends of the cell pole group 100 are both the first pole pieces 1.

In some embodiments of the present invention, as shown in fig. 2 and 5, the end lamination unit 50 is an auxiliary lamination unit 30, the auxiliary lamination unit 30 includes a first pole piece 1 and a diaphragm 3 located at two sides of the first pole piece 1, and a glue layer 7 is disposed between the first pole piece 1 and the diaphragm 3 at each side to achieve adhesion of the first pole piece 1 and the diaphragm 3. When the first lamination unit 40 is the first lamination unit 10, and the tail end lamination unit 50 is the auxiliary lamination unit 30, it can be ensured that the outermost pole pieces at both ends of the cell pole group 100 are the first pole pieces 1.

In some embodiments of the present invention, the first electrode sheet 1 is a negative electrode sheet, and the second electrode sheet 2 is a positive electrode sheet, so that the outermost electrode sheets at two ends of the cell electrode group 100 are both negative electrode sheets.

Of course, in some alternative embodiments, the first pole piece 1 may also be a positive pole piece, and the second pole piece 2 may also be a negative pole piece, so that the outermost pole pieces at the two ends of the cell pole group 100 are both positive pole pieces.

In some optional embodiments, the length of the first pole piece 1 is 1.01 to 1.1 times the length of the second pole piece 2. Referring to fig. 3 to 4, the length of the first pole piece 1 is L1, the length of the second pole piece 2 is L2, and L1 and L2 satisfy the following relations: l1 is 1.01L 2-1.1L 2. In one particular example, L1 ═ 1.05 × L2.

In some optional embodiments, the edge of the diaphragm 3 exceeds the edge of the pole piece adjacent to the diaphragm 3 by 1mm to 5mm, so that the pole piece is completely surrounded by the diaphragm 3, and the use safety of the battery cell pole group 100 is improved. Referring to fig. 3, the first membrane 31 and the second membrane 32 form a first bag-shaped structure, and the lower first pole piece 1 is located in the first bag-shaped structure. The third membrane 33 forms a second pocket with the second membrane 32, the second pole piece 2 being located in the second pocket. Referring to fig. 4, the first diaphragm 31 and the second diaphragm 32 form a first pocket structure, and the lower second pole piece 2 is located in the first pocket structure. The third membrane 33 and the second membrane 32 form a second pocket structure, in which the first pole piece 1 is located.

Referring to fig. 3 to 4, the left and right edges of the first separator 31 are located beyond L3 outward than the left and right edges of the first pole piece 1, and L3 has a range of 1mm to 5 mm. Referring to fig. 5, the left and right edges of the separator 3 are located outwardly beyond L4 than the left and right edges of the first pole piece 1, and L4 has a value ranging from 1mm to 5 mm. In one specific example, L4 is 2mm or 3mm or 4 mm.

Referring to fig. 12 to 13, a battery cell 400 according to an embodiment of the second aspect of the present invention includes a cell casing 405 and the battery cell pole group 100 of the above embodiment, a mounting cavity is formed inside the cell casing 405, the battery cell pole group 100 is located in the mounting cavity inside the cell casing 405, a positive pole column 401, a negative pole column 402, an explosion-proof valve 403, a liquid injection hole 404, and the like are further disposed on the battery cell 400, the cell casing 405 includes a first side plate and a second side plate, the first side plate and the second side plate are disposed opposite to each other, the positive pole column 401 and the explosion-proof valve 403 are located on the first side plate, and the negative pole column 402 and the liquid injection hole 404 are located on the second side plate.

The length L of the battery cell 400 is 200 mm-2800 mm, the width H of the battery cell 400 is 90 mm-300 mm, the thickness W of the battery cell 400 is 10 mm-60 mm, the length-thickness ratio of the battery cell is 3-280, the battery cell shell 405 is an aluminum shell, and the thickness W of the battery cell shell 405 is 0.1 mm-1 mm.

In some embodiments of the present invention, the length L of the battery cell 400 is 200mm to 600mm, the width W of the battery cell 400 is 120mm to 140mm, the thickness H of the battery cell 400 is 12mm to 50mm, and the length-to-thickness ratio of the battery cell 400 is 4 to 50. For example, in a specific example, the length L of the battery cell 400 is 300mm, the width W of the battery cell 400 is 130mm, the thickness H of the battery cell 400 is 30mm, and the length-thickness ratio of the battery cell 400 is 25.

According to the lamination method of the cell pole group 100 of the embodiment of the third aspect of the present invention, the cell pole group 100 is the above-mentioned cell pole group 100, and referring to fig. 1 to fig. 6, the lamination method includes the following steps:

s01: one of the first lamination units 10 is taken as a head-end lamination unit 40, and the second lamination units 20 and the first lamination units 10 are alternately stacked; specifically, the first lamination units 10 and the second lamination units 20 may be alternately stacked in the manner of fig. 1 to 2.

S02: end lamination units 50 are stacked on the last second lamination unit 20. Referring to fig. 1, end lamination unit 50 may be first lamination unit 10. Referring to fig. 2, end lamination unit 50 may be auxiliary lamination unit 30. After the stacking is completed, the outermost pole pieces at the two ends of the cell pole group 100 are the first pole pieces 1.

According to the lamination method of the battery cell pole group 100, the first lamination unit 10, the second lamination unit 20 and the end lamination unit 50 which are prefabricated are stacked according to the preset stacking mode, so that the lamination speed can be increased, and the production efficiency of the battery cell pole group 100 is improved.

Optionally, the lamination efficiency of the cell pole group is 700PPM to 1600 PPM. Further, the lamination efficiency is 1000-1500 PPM. For example, in one particular example, the lamination efficiency is 1200 PPM. It should be noted that "PPM" refers to the number of laminations per minute, for example, 700 laminations per minute when the lamination efficiency is 700 PPM.

According to the lamination apparatus 200 of the fourth aspect of the present invention, the lamination method of the battery cell pole group 100 is performed by the lamination apparatus 200, and as shown in fig. 7, the lamination apparatus 200 may include: a first conveying mechanism 201, a second conveying mechanism 202, a first deviation rectifying table 203, a second deviation rectifying table 205, a first conveying mechanism, a second conveying mechanism and a laminating table 204.

The first lamination unit 10 is located on a first conveyor 201, and the first conveyor 201 can move the first lamination unit 10 from one location to another. Alternatively, the first conveyance mechanism 201 may be a belt or a transfer table.

The first carrying mechanism is used for carrying the first lamination unit 10 on the first conveying mechanism 201 to the first deviation rectifying table 203 for position rectification, so that the first lamination unit 10 is righted, the first lamination unit 10 and the second lamination unit 20 can be directly stacked conveniently, and the lamination time can be saved.

The second lamination unit 20 is positioned on a second conveyor mechanism 202, and the second conveyor mechanism 202 may move the second lamination unit 20 from one location to another. Alternatively, the second conveyance mechanism 202 may be a belt or a transfer table.

The second carrying mechanism is used for carrying the second lamination unit 20 to the second deviation rectifying table 205 for position deviation rectification, so that the second lamination unit 20 is in a position righting state, the first lamination unit 10 and the second lamination unit 20 can be directly stacked conveniently, and lamination time is saved. The first and second de-skew tables 203 and 205 are separated so that de-skew operations of the first and

second lamination units

10 and 20 do not interfere with each other.

The first conveying mechanism is also used for conveying the first lamination unit 10 on the first deviation correcting table 203 to the lamination table 204, the second conveying mechanism is also used for conveying the second lamination unit 20 on the second deviation correcting table 205 to the lamination table 204, the first lamination unit 10 and the second lamination unit 20 are alternately stacked, and when the first conveying mechanism conveys the first lamination unit 10 to the lamination table 204, the second conveying mechanism can return from the lamination table 204 to the second deviation correcting table 205, or from the second deviation correcting table 205 to the second conveying mechanism 202, or from the lamination table 204 to the second conveying mechanism 202; when the second carrying mechanism carries the second lamination unit 20 to the lamination table 204, the first carrying mechanism can return from the lamination table 204 to the first deviation correcting table 203, or return from the first deviation correcting table 203 to the first conveying mechanism 201, or return from the lamination table 204 to the first conveying mechanism 201, so that the lamination steps can be reasonably arranged, and the lamination speed is favorably improved.

The first or second handling mechanism is also used to handle the end lamination unit 50 to the last second lamination unit 20. The lamination apparatus 200 may further include an auxiliary table on which the auxiliary lamination unit 30 is located. The first or second handling mechanism may handle the end lamination unit 50 from the auxiliary station to the lamination station 204 and place it on the last second lamination unit 20.

Of course, an auxiliary handling mechanism may be provided separately, dedicated to handling the end lamination unit 50 onto the last second lamination unit 20.

According to the lamination device 200 of the embodiment of the invention, the first lamination unit 10 is subjected to position correction on the first correction table 203, the second lamination unit 20 is subjected to position correction on the second correction table 205, and the first correction table 203 and the second correction table 205 are separated, so that the correction work of the first lamination unit 10 and the second lamination unit 20 are not interfered with each other, and the first lamination unit 10 and the second lamination unit 20 are alternately stacked on the lamination table 204, which is beneficial to improving the lamination speed, thereby improving the production efficiency of the battery cell pole group 100.

In some embodiments of the present invention, referring to fig. 7-8, a first handling mechanism handles a plurality of first lamination units 10 simultaneously, and a second handling mechanism handles a plurality of second lamination units 20 simultaneously to form a plurality of cell pole groups 100 simultaneously. The number of the first lamination units 10 simultaneously conveyed by the first conveying mechanism and the number of the second lamination units 20 simultaneously conveyed by the second conveying mechanism may be both N, so that N cell pole groups 100 may be formed at one time. In some embodiments, N satisfies the relationship: n is more than or equal to 2 and less than or equal to 30, and N is an integer, the lamination efficiency is greatly improved, for example, the lamination efficiency of the battery cell pole group is 700 PPM-1600 PPM, and further, the lamination efficiency can reach 1000PPM-1500 PPM.

The first carrying mechanism may include a first carrying first suction plate for carrying the first lamination unit 10 on the first conveying mechanism 201 onto the first deviation rectifying table 203, and a first carrying second suction plate for carrying the first lamination unit 10 on the first deviation rectifying table 203 onto the lamination table 204.

Similarly, the second carrying mechanism may include a second carrying first suction plate for carrying the second lamination unit 20 on the second conveying mechanism 202 onto the second deviation rectifying table 205 and a second carrying second suction plate for carrying the second lamination unit 20 on the second deviation rectifying table 205 onto the lamination table 204.

In some embodiments of the present invention, the conveying direction of the first and second conveying mechanisms is perpendicular to the conveying direction of the first and second conveying

mechanisms

201 and 202. Referring to fig. 7, the conveying direction of the first conveying mechanism and the second conveying mechanism is F1-F2 reciprocating direction, the conveying direction of the first conveying mechanism 201 and the second conveying mechanism 202 is F3 direction, and the reciprocating direction of F1-F2 is perpendicular to the F3 direction.

In some embodiments of the present invention, the first conveying mechanism, the second conveying mechanism, the first deviation rectifying table 203, the second deviation rectifying table 205 and the lamination table 204 are located at the same end of the first conveying mechanism 201 and the second conveying mechanism 202, for example, as shown in fig. 7, and the first conveying mechanism, the second conveying mechanism, the first deviation rectifying table 203, the second deviation rectifying table 205 and the lamination table 204 are located at the right end of the first conveying mechanism 201 and the second conveying mechanism 202. The lamination table 204 is located between the first deviation rectifying table 203 and the second deviation rectifying table 205, so that the first lamination unit 10 is conveyed to the lamination table 204 from one side, the second lamination unit 20 is conveyed to the lamination table 204 from the other side, the conveying distance is short, and the conveying efficiency is improved.

According to the manufacturing method of the lamination unit in the fifth aspect of the present invention, for manufacturing the battery pole group 100, as shown in fig. 9 to 10, the manufacturing method may include the following steps:

s11: the first sheet roll is cut into a plurality of first sheets 4, and one side (for example, lower side) of each first sheet 4 is covered with a first separator 31, and the other side (for example, upper side) is covered with a second separator 32. The first membrane 31 may be a continuous, uncut membrane 3 and the second membrane 32 may be a continuous, uncut membrane 3. The leading pole pieces 4 can be separated from each other, thereby facilitating subsequent severing of the separator 3 between two adjacent leading pole pieces 4 for forming individual lamination units.

S12: the first separator 31, the first electrode sheet 4, and the second separator 32 are rolled. After the rolling, one side (for example, the lower side) of the first sheet 4 is closely attached to the first separator 31, and the other side (for example, the upper side) of the first sheet 4 is closely attached to the second separator 32.

S13: the intermediate pole piece roll is cut into a plurality of intermediate pole pieces 5, the intermediate pole pieces 5 are placed on the second separator 32, and the intermediate pole pieces 5 are at least partially aligned with the first pole piece 4. In some embodiments, the middle pole piece 5 is directly opposite the first pole piece 4. A plurality of intermediate pole pieces 5 can be separated from each other, thereby facilitating the subsequent cutting of the separator 3 between two adjacent intermediate pole pieces 5 for forming individual lamination units.

S14: the third membrane 33 is covered on the intermediate pole piece 5. The third membrane 33 may be a continuous, uncut membrane 3.

S15: the first separator 31, the first pole piece 4, the second separator 32, the intermediate pole piece 5, and the third separator 33 are rolled. After rolling, one side (e.g., the lower side) of the first pole piece 4 is tightly attached to the first diaphragm 31, the other side (e.g., the upper side) of the first pole piece 4 is tightly attached to the second diaphragm 32, one side (e.g., the lower side) of the middle pole piece 5 is tightly attached to the second diaphragm 32, and the other side (e.g., the upper side) of the middle pole piece 5 is tightly attached to the third diaphragm 33.

S16: the end sheet roll is cut into a plurality of end sheets 6, the end sheets 6 are placed on the third separator 33, and the end sheets 6 are at least partially aligned with the intermediate sheets 5. In some embodiments, the end pole piece 6 is directly opposite the middle pole piece 5. A plurality of end-pieces 6 may be separated from each other, thereby facilitating subsequent severing of the separator 3 between two adjacent end-pieces 6 for forming individual lamination units.

S17: the first diaphragm 31, the first pole piece 4, the second diaphragm 32, the intermediate pole piece 5, the third diaphragm 33 and the last pole piece 6 are rolled. After rolling, one side (e.g., the lower side) of the first sheet 4 is closely attached to the first diaphragm 31, the other side (e.g., the upper side) of the first sheet 4 is closely attached to the second diaphragm 32, one side (e.g., the lower side) of the middle sheet 5 is closely attached to the second diaphragm 32, the other side (e.g., the upper side) of the middle sheet 5 is closely attached to the third diaphragm 33, and the last sheet 6 is closely attached to one side (e.g., the upper side) of the third diaphragm 33.

S18: and performing edge sealing treatment and cutting to form a lamination unit. Specifically, the edge sealing treatment may be performed on the first diaphragm 31, the first pole piece 4, the second diaphragm 32, the middle pole piece 5, the third diaphragm 33, and the last pole piece 6, so as to ensure that the inside of the lamination unit has good sealing performance, and after the edge sealing treatment is completed, the lamination unit is cut, for example, a gap between two adjacent first pole pieces 4 is cut, so as to obtain a single lamination unit.

According to the manufacturing method of the lamination unit provided by the embodiment of the invention, the lamination unit comprising three pole pieces can be obtained by adopting the steps, and the corresponding first lamination unit 10 and second lamination unit 20 can be obtained by reasonably selecting the polarities of the first pole piece 4, the middle pole piece 5 and the last pole piece 6, so that the lamination unit can be conveniently applied to the production and manufacturing of the battery cell pole group 100 in the subsequent process.

In S11, before one side of the leading sheet 4 is covered with the first separator 31, glue is applied between the first separator 31 and the leading sheet 4, whereby the adhesion between the first separator 31 and the leading sheet 4 can be increased. Before the other side of the first sheet 4 is covered with the second diaphragm 32, glue is applied between the second diaphragm 32 and the first sheet 4, thereby increasing the adhesion between the second diaphragm 32 and the first sheet 4.

In some embodiments of the present invention, referring to fig. 10, when the middle pole piece 5 is placed on the second separator 32 in S13, glue may be applied between the middle pole piece 5 and the second separator 32, thereby increasing the adhesion between the second separator 32 and the middle pole piece 5. After S13 and before S14, S131 is further included: glue is applied between the third membrane 33 and the intermediate pole piece 5, whereby the adhesion between the third membrane 33 and the intermediate pole piece 5 can be increased.

In some embodiments, the glue may be applied in the following manner: glue is applied to the corresponding membrane. For example, in S11, before the side of the leading pole piece 4 is covered with the first separator 31, glue is applied to the surface of the first separator 31 facing the leading pole piece 4. In S13, glue is applied to the surface of the second membrane 32 facing the intermediate pole piece 5. In S131, glue is applied to the surface of the third membrane 33 facing the middle pole piece 5.

In some embodiments, the glue may be applied in the following manner: and gluing the corresponding pole pieces. For example, in S11, before the side of the leading pole piece 4 is covered with the first diaphragm 31, glue is applied to the surface of the leading pole piece 4 facing the first diaphragm 31. In S13, glue is applied to the surface of the intermediate pole piece 5 facing the second separator 32. In S131, glue is applied to the surface of the intermediate pole piece 5 facing the third membrane 33.

In some embodiments, the gluing may be: and prefabricating an adhesive layer on the corresponding diaphragm. For example, in S11, before one side of the leading pole piece 4 is covered with the first separator 31, the first separator 31 is a separator having a pre-glue layer. In S13, the second separator 32 is a separator having a pre-glue layer. In S131, the third membrane 33 is a membrane having a pre-glue layer.

In some embodiments, the glue may be applied in the following manner: and prefabricating an adhesive layer on the corresponding pole piece. For example, in S11, the leading pole piece 4 is a pole piece with a pre-glue layer before one side of the leading pole piece 4 is covered with the first separator 31. In S13, the middle pole piece 5 is a pole piece with a pre-glue layer. In S131, the middle pole piece 5 is a pole piece with a pre-adhesive layer.

In some embodiments of the present invention, as shown with reference to fig. 10, after S15 and before S16, S151 is further included: and detecting the alignment degree of the middle pole piece 5 and the first pole piece 4. If the alignment degree of the middle pole piece 5 and the first pole piece 4 exceeds a certain threshold value, the middle pole piece 5 and the first pole piece 4 can be marked as waste pieces, and then the waste pieces are removed.

After S17 and before S18, S171: the alignment of the end pole piece 6 and the middle pole piece 5 is detected. If the alignment degree of the end pole piece 6 and the middle pole piece 5 exceeds a certain threshold value, the end pole piece 6 and the middle pole piece 5 can be marked as waste pieces, and then the waste pieces are removed.

In some embodiments of the present invention, referring to fig. 10, in S18, after the edge sealing process and before the cutting, a short circuit test is performed. After the cutting operation is finished, the unqualified lamination units can be removed.

The polarity of the last pole piece 6 is opposite to that of the middle pole piece 5, the polarity of the first pole piece 4 is opposite to that of the middle pole piece 5, and the polarity of the first pole piece 4 is the same as that of the last pole piece 6.

In some embodiments of the present invention, the first pole piece 4 and the last pole piece 6 are the first pole piece 1, and the middle pole piece 5 is the second pole piece 2, and the manufacturing method of the lamination unit can be used to manufacture the first lamination unit 10.

In some embodiments of the present invention, the first pole piece 4 and the last pole piece 6 are the second pole piece 2, and the middle pole piece 5 is the first pole piece 1, and the manufacturing method of the lamination unit can be used to manufacture the second lamination unit 20.

In some embodiments of the invention, the rolling temperature is 40 ℃ to 90 ℃ and the roll pressure is 20MPa to 70 MPa. For example, in one specific example, the rolling temperature is 60 ℃ and the rolling pressure is 50 MPa.

In some embodiments of the present invention, the manner of cutting the pole piece and the diaphragm may be: cutting by laser.

In some embodiments of the present invention, the manner of cutting the pole piece and the diaphragm may be: mechanical cutting is realized through cutting.

According to the lamination unit manufacturing apparatus 300 according to the sixth aspect of the present invention, the above-described method of manufacturing the lamination unit is performed by the lamination unit manufacturing apparatus 300, and referring to fig. 11, the lamination unit manufacturing apparatus 300 may include: the cutting device comprises a first unwinding mechanism 301, a first cutting mechanism 302, a first diaphragm unwinding mechanism 303, a second diaphragm unwinding mechanism 304, a first rolling mechanism 305, a second unwinding mechanism 306, a second cutting mechanism 307, a third diaphragm unwinding mechanism 308, a second rolling mechanism 309, a third unwinding mechanism 310, a third cutting mechanism 311, a third rolling mechanism 312, a sealing mechanism 313 and a fourth cutting mechanism 314.

A first pole piece roll is wound on the first unwinding mechanism 301, and when a winding shaft of the first unwinding mechanism 301 rotates in the forward direction, the first pole piece roll can be unwound; when the reel of the first unwinding mechanism 301 rotates reversely, the first pole piece can be wound.

The first cutting mechanism 302 is located at the downstream of the first unwinding mechanism 301, and the first cutting mechanism 302 is configured to cut the first pole piece roll unwound by the first unwinding mechanism 301 into the first pole piece 4. The first cutting mechanism 302 may be two cutting blades arranged oppositely, and the first pole piece 4 may be plural.

In the present invention, the term "downstream" means that a process related to a downstream mechanism is subsequent to a process related to an upstream mechanism in the flow of the process, and for example, a process of cutting a leading sheet roll is performed after an unwinding process of the leading sheet roll.

A first membrane roll is wound on the first membrane unwinding mechanism 303, and when a winding shaft of the first membrane unwinding mechanism 303 rotates in the forward direction, the first membrane roll can be unwound; when the reel of the first membrane unreeling mechanism 303 rotates reversely, the first membrane can be reeled. The first membrane unwinding mechanism 303 is located downstream of the first cutting mechanism 302, and the first membrane 31 unwound by the first membrane unwinding mechanism 303 is located on one side of the first pole piece 4, for example, on the lower side of the first pole piece 4.

A second membrane roll is wound on the second membrane unwinding mechanism 304, and when a winding shaft of the second membrane unwinding mechanism 304 rotates in the forward direction, the second membrane roll can be unwound; when the reel of the second membrane unwinding mechanism 304 rotates in the reverse direction, the second membrane can be wound. The second membrane unwinding mechanism 304 is located downstream of the first cutting mechanism 302, and the second membrane 32 unwound by the second membrane unwinding mechanism 304 is located on the other side of the first pole piece 4, for example, on the upper side of the first pole piece 4; the first unwinding mechanism 301, the first cutting mechanism 302, the first membrane unwinding mechanism 303, and the second membrane unwinding mechanism 304 may be used in step S11 of the method for manufacturing a lamination unit.

The first rolling mechanism 305 is located downstream of the first membrane unwinding mechanism 303 and the second membrane unwinding mechanism 304, and the first rolling mechanism 305 is configured to roll the first membrane 31, the first pole piece 4, and the second membrane 32 passing through the first rolling mechanism 305. The first rolling mechanism 305 may be used in step S12 of the manufacturing method of the lamination unit. After rolling, one side of the first pole piece 4 is tightly attached to the first diaphragm 31, and the other side of the first pole piece 4 is tightly attached to the second diaphragm 32.

The second unwinding mechanism 306 is wound with an intermediate pole piece roll, and when a winding shaft of the second unwinding mechanism 306 rotates in the forward direction, the intermediate pole piece roll can be unwound; when the reel of the second unwinding mechanism 306 rotates reversely, the middle pole piece can be wound.

The second cutting mechanism 307 is configured to cut the intermediate pole piece roll unwound by the second unwinding mechanism 306 into the intermediate pole piece 5, the intermediate pole piece 5 is stacked on the second separator 32, and the intermediate pole piece 5 is at least partially aligned with the first pole piece 4. The second cutting mechanism 307 may be two cutting blades disposed opposite to each other. The second unwinding mechanism 306 and the second cutting mechanism 307 may be used in step S13 of the method for manufacturing the lamination unit. In some embodiments, the middle pole piece 5 is directly opposite the first pole piece 4. The intermediate pole pieces 5 are multiple, and the multiple intermediate pole pieces 5 can be separated from each other, so that the diaphragm 3 between two adjacent intermediate pole pieces 5 can be cut conveniently for forming an independent lamination unit.

A third diaphragm roll is wound on the third diaphragm unwinding mechanism 308, and when the scroll of the third diaphragm unwinding mechanism 308 rotates in the forward direction, the third diaphragm roll can be unwound; when the reel of the third membrane unwinding mechanism 308 rotates in the reverse direction, the third membrane can be wound. The third membrane unwinding mechanism 308 is located downstream of the second cutting mechanism 307, and the third membrane 33 unwound by the third membrane unwinding mechanism 308 is located on a side of the middle pole piece 5 facing away from the second membrane 32, for example, the third membrane 33 is located on an upper side of the middle pole piece 5. The third membrane unwinding mechanism 308 may be used in step S14 of the manufacturing method of the lamination unit.

The second rolling mechanism 309 is located downstream of the third membrane unwinding mechanism 308, and the second rolling mechanism 309 is configured to roll the first membrane 31, the first pole piece 4, the second membrane 32, the middle pole piece 5, and the third membrane 33 that pass through the second rolling mechanism 309. The second rolling mechanism 309 may be used in step S15 of the manufacturing method of the lamination unit. After rolling, one side of the first pole piece 4 is tightly attached to the first diaphragm 31, the other side of the first pole piece 4 is tightly attached to the second diaphragm 32, one side of the middle pole piece 5 is tightly attached to the second diaphragm 32, and the other side of the middle pole piece 5 is tightly attached to the third diaphragm 33.

The third unwinding mechanism 310 is provided with a last pole piece roll in a winding manner, and when a winding shaft of the third unwinding mechanism 310 rotates in the forward direction, the last pole piece roll can be unwound; when the winding shaft of the third unwinding mechanism 310 rotates reversely, the last pole piece roll can be wound.

The third cutting mechanism 311 is located downstream of the third unwinding mechanism 310, the third cutting mechanism 311 is configured to cut an end-tensioned sheet roll unwound by the third unwinding mechanism 310 into an end-tensioned sheet 6, the end-tensioned sheet 6 is stacked on the third diaphragm 33, and the end-tensioned sheet 6 is at least partially aligned with the middle sheet 5. The third cutting mechanism 311 may be two cutting blades disposed opposite to each other. The third unwinding mechanism 310 and the third cutting mechanism 311 may be used in step S16 of the method for manufacturing the lamination unit. In some embodiments, the end pole piece 6 is directly opposite the middle pole piece 5. The end-sheet 6 is in plurality, and the end-sheet 6 can be separated from each other, thereby facilitating the subsequent cutting of the diaphragm 3 between two adjacent end-sheet 6 for forming an individual lamination unit.

The third rolling mechanism 312 is located downstream of the third membrane unwinding mechanism 308, and the third rolling mechanism 312 is configured to roll the first membrane 31, the first pole piece 4, the second membrane 32, the middle pole piece 5, the third membrane 33, and the last pole piece 6 that pass through the third rolling mechanism 312. The third crimping mechanism 312 may be used in step S17 of the manufacturing method of the lamination unit. After rolling, one side of the first pole piece 4 is tightly attached to the first diaphragm 31, the other side of the first pole piece 4 is tightly attached to the second diaphragm 32, one side of the middle pole piece 5 is tightly attached to the second diaphragm 32, the other side of the middle pole piece 5 is tightly attached to the third diaphragm 33, and the last pole piece 6 is tightly attached to one side of the third diaphragm 33.

The edge sealing mechanism 313 is located at the downstream of the third rolling mechanism 312, and the edge sealing mechanism 313 is used for sealing the first diaphragm 31, the first pole piece 4, the second diaphragm 32, the middle pole piece 5, the third diaphragm 33 and the last pole piece 6, so that the good internal sealing performance of the lamination unit can be ensured.

A fourth severing mechanism 314 is located downstream of the edge banding mechanism 313, and the fourth severing mechanism 314 is used to sever the layers of membrane 3 to form a lamination unit. For example, the gap between two adjacent leading pole pieces 4 is cut, so that a single lamination unit is obtained. Fourth severing mechanism 314 may be two oppositely disposed severing knives. The edge banding mechanism 313 and the fourth cutting mechanism 314 may be used in step S18 of the method of manufacturing the lamination unit.

The rolling temperature of the first rolling mechanism 305, the second rolling mechanism 309 and the third rolling mechanism 312 is 40-90 ℃, and the rolling pressure is 20-70 MPa. For example, in one specific example, the first rolling mechanism 305, the second rolling mechanism 309, and the third rolling mechanism 312 have a rolling temperature of 60 ℃ and a rolling pressure of 50 MPa.

In some embodiments, first severing mechanism 302, second severing mechanism 307, third severing mechanism 311, fourth severing mechanism 314 may be laser severing structures to achieve laser cutting.

In other embodiments, the first cutting mechanism 302, the second cutting mechanism 307, the third cutting mechanism 311, and the fourth cutting mechanism 314 may be cutting knives to realize mechanical cutting by mechanical cutting.

The lamination unit manufacturing apparatus 300 may further include a first sensing unit 315 and a second sensing unit 316. The first detection unit 315 is used for detecting the alignment of the middle pole piece 5 and the first pole piece 4 in step S151 of the manufacturing method of the lamination unit. The second detection unit 316 is used to detect the alignment of the end pole piece 6 and the middle pole piece 5 in step S161 of the lamination unit manufacturing method. Alternatively, the first and second detection units 315 and 316 may be camera detection units.

A short circuit testing mechanism 317 is arranged between the edge sealing mechanism 313 and the fourth cutting mechanism 314 and is used for carrying out short circuit testing on the pole pieces. The short circuit testing mechanism 317 may be used in step S18 of the manufacturing method of the laminated unit.

And a rejecting mechanism 322 is arranged at the downstream of the fourth cutting mechanism 314, and after the cutting operation is finished, the rejecting mechanism 322 can reject out unqualified lamination units.

The rear side of the removing mechanism 322 can be connected with the first conveying mechanism 201 and the second conveying mechanism 202, so that the non-removed lamination units directly reach the corresponding conveying mechanisms, and the lamination units participate in the subsequent lamination process after being manufactured, thereby being beneficial to improving the production efficiency of the battery core pole group. For example, when the first lamination unit is manufactured using the lamination unit manufacturing apparatus 300, the rear side of the rejecting mechanism 322 is connected to the first conveying mechanism 201; when the second lamination unit is manufactured using the lamination unit manufacturing apparatus 300, the rear side of the reject mechanism 322 is connected to the second conveying mechanism 202.

The lamination unit manufacturing apparatus 300 may further include a first glue application mechanism 318, a second glue application mechanism 319, a third glue application mechanism 320, and a fourth glue application mechanism 321. In step S11, the first glue applying mechanism 318 is used for applying glue between the first membrane 31 and the first pole piece 4 to increase the adhesion between the first membrane 31 and the first pole piece 4; the second glue applying mechanism 319 is used for applying glue between the second membrane 32 and the first pole piece 4 in step S11 of the method for manufacturing the lamination unit, so as to increase the adhesion between the second membrane 32 and the first pole piece 4; the third glue applying mechanism 320 is used for applying glue between the middle pole piece 5 and the second membrane 32 in step S13 of the method for manufacturing a lamination unit, so as to increase the adhesion between the second membrane 32 and the middle pole piece 5; the fourth glue applying mechanism 321 is used for applying glue between the third membrane 33 and the middle pole piece 5 in step S131 of the manufacturing method of the lamination unit to increase the adhesion between the third membrane 33 and the middle pole piece 5.

The lamination unit manufacturing equipment 300 may further include a first laser mechanism 323, a second laser mechanism 324, and a third laser mechanism 325, the first laser mechanism 323 is disposed on the unwinding path of the first unwinding mechanism 301, the first laser mechanism 323 is configured to perform laser tab cutting on the first pole piece 4, the second laser mechanism 324 is disposed on the unwinding path of the second unwinding mechanism 306, the second laser mechanism 324 is configured to perform laser tab cutting on the middle pole piece 5, the third laser mechanism 325 is disposed on the unwinding path of the third unwinding mechanism 310, and the third laser mechanism 325 is configured to perform laser tab cutting on the last pole piece 6.

According to the lamination unit manufacturing equipment 300 provided by the embodiment of the invention, a lamination unit comprising three layers of pole pieces can be obtained, and the corresponding first lamination unit 10 and second lamination unit 20 can be obtained by reasonably selecting the polarities of the first pole piece 4, the middle pole piece 5 and the last pole piece 6, so that the lamination unit can be conveniently applied to the production and manufacturing of the battery cell pole group 100 in the subsequent process. When the lamination unit is manufactured, the moving direction of the first pole piece 1 and the second pole piece 2 is along the direction F4 in fig. 11, and the length L1 of the first pole piece 1 and the length L2 of the second pole piece 2 mentioned above refer to the size of the first pole piece 1 and the second pole piece 2 in the direction F4.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A cell pole group, comprising:

the lamination unit (10) comprises a first pole piece (1), a second pole piece (2) and a first pole piece (1) which are sequentially stacked, a diaphragm (3) is arranged between the second pole piece (2) and the adjacent first pole piece (1), and the diaphragm (3) is arranged on one side, away from the second pole piece (2), of one first pole piece (1);

the second lamination unit (20) comprises second pole pieces (2), first pole pieces (1) and second pole pieces (2) which are sequentially stacked, a diaphragm (3) is arranged between each first pole piece (1) and the adjacent second pole piece (2), and the diaphragm (3) is arranged on one side, away from the first pole piece (1), of one second pole piece (2);

one of the first lamination unit (10) is a head end lamination unit (40), the second lamination unit (20) and the first lamination unit (10) are alternately stacked, a diaphragm (3) is arranged between the first pole piece (1) and the adjacent second pole piece (2), the last one of the first pole piece and the adjacent second pole piece is a tail end lamination unit (50) stacked on the second lamination unit (20), and the outermost pole piece of the tail end lamination unit (50) is the first pole piece (1).

2. The cell pole group of claim 1, wherein the end lamination unit (50) is the first lamination unit (10).

3. The cell pole group according to claim 1, wherein the end lamination unit (50) is an auxiliary lamination unit (30), the auxiliary lamination unit (30) comprising a first pole piece (1) and a membrane (3) on both sides of the first pole piece (1).

4. The cell pole group according to any of claims 1 to 3, wherein the first pole piece (1) is a negative pole piece and the second pole piece (2) is a positive pole piece.

5. The cell pole group according to claim 4, wherein the length of the first pole piece (1) is 1.01-1.1 times the length of the second pole piece (2).

6. The cell pole group according to any of claims 1 to 3, characterized in that the edge of the membrane (3) exceeds the edge of the pole piece adjacent to the membrane (3) by 1-5 mm outwards.

7. A battery cell comprising a cell casing (405) and the cell pole group of any of claims 1-6, the length of the battery cell (400) is 200mm to 2800mm, the width of the battery cell (400) is 90mm to 300mm, the thickness of the battery cell (400) is 10mm to 60mm, the length-to-thickness ratio of the battery cell (400) is 3 to 280, the cell casing (405) is an aluminum casing, and the thickness of the cell casing (405) is 0.1mm to 1 mm.

8. The battery cell of claim 7, wherein the length of the battery cell (400) is 200mm to 600mm, the width of the battery cell (400) is 120mm to 140mm, the thickness of the battery cell (400) is 12mm to 50mm, and the length-to-thickness ratio of the battery cell (400) is 4 to 50.

9. A lamination method of a cell pole group, wherein the cell pole group is the cell pole group according to any one of claims 1 to 6, and the lamination method comprises the following steps:

s01: -taking one of said first lamination units (10) as a head-end lamination unit (40), and alternately stacking said second lamination units (20) and said first lamination units (10);

s02: stacking said end lamination units (50) on the last of said second lamination units (20).

10. The method of claim 9, wherein the lamination efficiency of the cell pole group is 700PPM to 1600 PPM.

11. A lamination apparatus, wherein the lamination method of the cell pole group according to claim 9 or 10 is performed by the lamination apparatus, and the lamination apparatus comprises:

a first conveying mechanism (201), the first lamination unit (10) being located on the first conveying mechanism (201);

a first deviation rectifying table (203);

the first conveying mechanism is used for conveying the first lamination unit (10) on the first conveying mechanism (201) to the first deviation rectifying table (203) for position deviation rectification;

a second conveyor (202), said second lamination unit (20) being located on said second conveyor (202);

a second deviation rectifying table (205);

the second conveying mechanism is used for conveying the second lamination unit (20) to the second deviation rectifying table (205) for position deviation rectification;

a lamination table (204), the first carrying mechanism is further used for carrying the first lamination unit (10) on the first deviation rectifying table (203) onto the lamination table (204), the second carrying mechanism is further used for carrying the second lamination unit (20) on the second deviation rectifying table (205) onto the lamination table (204), the first lamination unit (10) and the second lamination unit (20) are stacked alternately, and the first carrying mechanism or the second carrying mechanism or the auxiliary carrying mechanism is further used for carrying the end lamination unit (50) onto the last second lamination unit (20).

12. The lamination device according to claim 11, wherein the first handling mechanism handles a plurality of the first lamination units (10) simultaneously, and the second handling mechanism handles a plurality of the second lamination units (20) simultaneously to form a plurality of the cell pole groups simultaneously.

13. The lamination device according to claim 11, wherein the handling direction of the first handling mechanism and the second handling mechanism is perpendicular to the handling direction of the first conveyor mechanism (201) and the second conveyor mechanism (202).

14. The lamination apparatus according to claim 11, wherein the first handling mechanism, the second handling mechanism, the first de-skew table (203), the second de-skew table (205), the lamination table (204) are located at a same end of the first conveying mechanism (201) and the second conveying mechanism (202), and the lamination table (204) is located between the first de-skew table (203) and the second de-skew table (205).

15. A method of manufacturing a lamination unit, for manufacturing a cell pole group according to any one of claims 1 to 6, the method comprising the steps of:

s11: cutting a first pole piece roll into a plurality of first pole pieces (4), covering one side of each first pole piece (4) with a first diaphragm (31), and covering the other side of each first pole piece (4) with a second diaphragm (32);

s12: rolling the first membrane (31), the first pole piece (4) and the second membrane (32);

s13: cutting an intermediate pole piece roll into a plurality of intermediate pole pieces (5), placing the intermediate pole pieces (5) on the second separator (32), and at least partially aligning the intermediate pole pieces (5) with the leading pole piece (4);

s14: -covering said intermediate pole piece (5) with a third membrane (33);

s15: rolling the first diaphragm (31), the first pole piece (4), the second diaphragm (32), the intermediate pole piece (5), the third diaphragm (33);

s16: cutting an end sheet roll into a plurality of end sheets (6), placing the end sheets (6) on the third membrane (33), and at least partially aligning the end sheets (6) with the intermediate sheets (5);

s17: rolling the first diaphragm (31), the first pole piece (4), the second diaphragm (32), the middle pole piece (5), the third diaphragm (33) and the last pole piece (6);

16. Method for manufacturing a lamination unit according to claim 15, characterized in that glue is applied between the first membrane (31) and the first pole piece (4) before one side of the first pole piece (4) is covered with the first membrane (31); before the other side of the first pole piece (4) is covered with a second diaphragm (32), glue is coated between the second diaphragm (32) and the first pole piece (4).

17. The method of manufacturing a lamination unit according to claim 16, wherein, in said S13, when the intermediate pole piece (5) is placed on the second diaphragm (32), glue is applied between the intermediate pole piece (5) and the second diaphragm (32);

after the S13 and before the S14, further comprising S131: glue is applied between the third membrane (33) and the intermediate pole piece (5).

18. A method of manufacturing a lamination unit according to claim 16 or 17, wherein the glue is applied in the form of: gluing the corresponding diaphragm; or, gluing on the corresponding pole piece; or, prefabricating a glue layer on the corresponding diaphragm; or, prefabricating an adhesive layer on the corresponding pole piece.

19. The method of manufacturing a lamination unit according to claim 15, further comprising, after the S15 and before the S16, S151: detecting the alignment degree of the middle pole piece (5) and the first pole piece (4);

after the S17 and before the S18, further comprising S171: and detecting the alignment degree of the end pole piece (6) and the middle pole piece (5).

20. The method of manufacturing a lamination unit according to claim 15, wherein in S18, a short circuit test is performed after the edge sealing process and before the cutting process.

21. The manufacturing method of a lamination unit according to claim 15, characterized in that said first pole piece (4) and said last pole piece (6) are first pole pieces (1), said intermediate pole piece (5) is a second pole piece (2); alternatively, the first and second electrodes may be,

the first pole piece (4) and the last pole piece (6) are second pole pieces (2), and the middle pole piece (5) is a first pole piece (1).

22. The method of manufacturing a lamination unit according to claim 15, wherein the rolling temperature is 40 ℃ to 90 ℃ and the rolling pressure is 20MPa to 70 MPa.

23. A method of manufacturing a lamination unit according to claim 15, wherein the cutting is performed by: mechanical severing is achieved by laser severing or by cutting.

24. A lamination unit manufacturing apparatus, characterized in that the method of manufacturing a lamination unit according to any one of claims 15 to 23 is manufactured by the lamination unit manufacturing apparatus, comprising:

the first unwinding mechanism (301), the first pole piece roll is wound on the first unwinding mechanism (301);

the first cutting mechanism (302) is positioned at the downstream of the first unwinding mechanism (301), and the first cutting mechanism (302) is used for cutting the first pole piece roll unwound by the first unwinding mechanism (301) into the first pole piece (4);

the first membrane unwinding mechanism (303), a first membrane roll is wound on the first membrane unwinding mechanism (303), the first membrane unwinding mechanism (303) is located at the downstream of the first cutting mechanism (302), and a first membrane (31) unwound by the first membrane unwinding mechanism (303) is located at one side of the first pole piece (4);

a second membrane unwinding mechanism (304), wherein a second membrane roll is wound on the second membrane unwinding mechanism (304), the second membrane unwinding mechanism (304) is located at the downstream of the first cutting mechanism (302), and a second membrane (32) unwound by the second membrane unwinding mechanism (304) is located at the other side of the first pole piece (4);

a first rolling mechanism (305), wherein the first rolling mechanism (305) is located downstream of the first membrane unwinding mechanism (303) and the second membrane unwinding mechanism (304), and is used for rolling the first membrane (31), the first pole piece (4) and the second membrane (32) passing through the first rolling mechanism (305);

the second unwinding mechanism (306), the middle pole piece roll is wound on the second unwinding mechanism (306);

the second cutting mechanism (307) is used for cutting the intermediate pole piece roll unreeled by the second unreeling mechanism (306) into the intermediate pole piece (5), and the intermediate pole piece (5) is stacked on the second diaphragm (32);

a third membrane unwinding mechanism (308), a third membrane roll is wound on the third membrane unwinding mechanism (308), the third membrane unwinding mechanism (308) is located at the downstream of the second cutting mechanism (307), and a third membrane (33) unwound by the third membrane unwinding mechanism (308) is located on one side, away from the second membrane (32), of the middle pole piece (5);

the second rolling mechanism (309) is located downstream of the third membrane unreeling mechanism (308), and is used for rolling the first membrane (31), the first pole piece (4), the second membrane (32), the middle pole piece (5) and the third membrane (33) passing through the second rolling mechanism (309);

the third unwinding mechanism (310), the last pole piece roll is wound on the third unwinding mechanism (310);

a third cutting mechanism (311), wherein the third cutting mechanism (311) is located at the downstream of the third unwinding mechanism (310), the third cutting mechanism (311) is used for cutting the final-tension pole piece roll unwound by the third unwinding mechanism (310) into the final-tension pole piece (6), and the final-tension pole piece (6) is stacked on the third diaphragm (33);

the third rolling mechanism (312) is located downstream of the third membrane unwinding mechanism (308), and is used for rolling the first membrane (31), the first pole piece (4), the second membrane (32), the middle pole piece (5), the third membrane (33) and the last pole piece (6) which pass through the third rolling mechanism (312);

a sealing mechanism (313), which is located downstream of the second diaphragm (32) and is used for sealing the first diaphragm (31), the first pole piece (4), the second diaphragm (32), the middle pole piece (5), the third diaphragm (33) and the last pole piece (6);

a fourth severing mechanism (314), said fourth severing mechanism (314) being located downstream of said banding mechanism (313) and being used to sever each layer of membrane (3) to form said lamination unit.