CN114243115A

CN114243115A - Lamination method of battery cell

Info

Publication number: CN114243115A
Application number: CN202111399953.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuxi Lead Intelligent Equipment Co Ltd
Current assignee: Wuxi Lead Intelligent Equipment Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-03-25

Abstract

The invention relates to a lamination method of a battery cell. The lamination method of the battery cell comprises the following steps: a. unwinding an output diaphragm so that the diaphragm passes through a stacking station; wherein the portion at the stacking station is a lamination unit having first and second opposing sides; b. respectively attaching pole pieces to the first side and the second side of the lamination unit to form a new lamination unit; c. rotating the new lamination unit by 180 ° to draw the diaphragms located upstream and downstream of the stacking station to wrap around the first and second sides of the lamination unit, respectively; d. sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cores, wherein each battery core comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces; and optionally replacing at least one of the two pole pieces with a separator in the process of circularly executing the step b, so that the separator is arranged between every two adjacent battery cells of the lamination unit.

Description

Lamination method of battery cell

Technical Field

The invention relates to the technical field of battery manufacturing, in particular to a lamination method of a battery core.

Background

The manufacturing technology of the lithium ion battery is a key technology for the development of new energy industry, the battery cell is an important component of the lithium ion battery, and the battery cell can be generally prepared by two processes of lamination and winding. When the battery cell is prepared by adopting a lamination process, a predetermined number of positive plates, diaphragms and negative plates are sequentially stacked to form the battery cell, and then the stacked battery cell is subjected to hot pressing.

However, in the driving lamination process, only one battery cell can be stacked and then sent into hot-pressing equipment for hot pressing, which seriously affects the production efficiency and cannot meet the production requirements.

Disclosure of Invention

Therefore, it is necessary to provide a lamination method for a battery cell, which can improve the above defects, for solving the problems that the production efficiency is low and the production requirements cannot be met because the lamination process in the prior art can only complete stacking of one battery cell and then the battery cell is sent into hot-pressing equipment for hot pressing.

A method of stacking cells, comprising:

a. unreeling an output diaphragm so that the diaphragm walks through a stacking station; wherein the material at the stacking station is a lamination unit having opposing first and second sides;

b. respectively attaching pole pieces to the first side and the second side of the lamination unit to form a new lamination unit;

c. rotating the new lamination unit by 180 ° to draw the diaphragms located upstream and downstream of the stacking station to wrap around the first and second sides of the lamination unit, respectively;

d. sequentially circulating the steps b to c until a lamination unit formed by stacking comprises a plurality of battery cells, wherein each battery cell comprises a plurality of layers of diaphragms and pole pieces; and optionally replacing at least one of the two pole pieces with a separator when step b is executed in a circulating manner, so that the separator is arranged between every two adjacent battery cells of the lamination unit.

In one embodiment, step a specifically includes:

and unreeling the diaphragm to the stacking station, outputting the diaphragm, and drawing the diaphragm to cross the stacking station until the diaphragm crossing the stacking station reaches a preset length.

In one embodiment, in the process of stacking and forming the first cell with the even number N of pole pieces: and when the step b is executed in the (N/2 +1) th cycle, the separator is attached to the first side and the second side.

In one embodiment, in the process of stacking and forming the first battery cell with the odd number M of pole pieces: when the step b is executed in the (M +1)/2 th cycle, the separator is attached to the first side, and the pole piece is attached to the second side; when the step b is executed in the [ (M +1)/2] +1 th cycle, the pole piece is attached to the first side, and the separator is attached to the second side; or

When a first battery cell with the odd number M of pole pieces is formed by stacking: when the step b is executed in the (M +1)/2 th cycle, the pole piece is attached to the first side, and the partition board is attached to the second side; and c, when the step b is executed in the (M +1)/2+1 th cycle, attaching the partition plate to the first side, and attaching the pole piece to the second side.

In one embodiment, during the process of completing the stacking of the first battery cell and continuing to stack and mold the subsequent battery cells on the first side and the second side:

after the current battery cell on the first side is stacked, a partition plate is attached to the first side when the step b is executed in the next cycle;

and b, after the current battery cell on the second side is completely stacked, adhering a partition plate on the second side when the step b is circularly executed next time.

In one embodiment, after step d, the method further comprises the steps of:

cutting the diaphragm connected to the first side, cutting the diaphragm connected to the second side.

In one embodiment, after the last cell stack on the first side of the lamination unit is completed, the diaphragm connected with the first side is cut off;

cutting the diaphragm connected with the second side after the last battery cell on the second side of the lamination unit is completely stacked.

In one embodiment, when the step b is executed in the Kth cycle, the positive plate is attached to the first side, and the negative plate is attached to the second side; when the step b is executed in the K +1 th cycle, attaching a negative plate to the first side, and attaching a positive plate to the second side;

wherein K is a positive integer greater than or equal to 1.

In one embodiment, after step d, the method further comprises the steps of:

cutting the diaphragm exposed between the first and second sides of the lamination unit.

In one embodiment, during the performance of step c on the ith cycle, the lamination unit is rotated 180 ° in a first sense of rotation, and during the performance of step c on the (i +1) th cycle, the lamination unit is rotated 180 ° in the first sense of rotation; wherein i is a positive integer.

In one embodiment, during the performance of step c on the ith cycle, the lamination unit is rotated 180 ° in a first sense of rotation, and during the performance of step c on the (i +1) th cycle, the lamination unit is rotated 180 ° in a second sense of rotation opposite to the first sense of rotation; wherein i is a positive integer.

In one embodiment, step b specifically includes:

respectively carrying two pole pieces to the first side and the second side of the lamination unit, and positioning and correcting the pole pieces in the pole piece carrying process;

and respectively attaching the two pole pieces to the first side and the second side.

After the pole pieces are attached to the first side and the second side of the lamination unit, the diaphragms upstream and downstream of the stacking station are respectively wound on the pole pieces on the first side and the second side of the lamination unit (namely, the diaphragms are stacked on the two pole pieces) by rotating the lamination unit by 180 degrees, and then more pole pieces and diaphragms are stacked on the first side and the second side of the lamination unit in a circulating manner. And when the current battery cell is completely stacked and the step b is continuously and circularly executed, replacing the pole pieces with the partition plates, namely fitting the partition plates to the first side and/or the second side of the lamination unit, and then continuously forming more battery cells in the same manner. After the multiple battery cells are formed, the whole lamination unit (including the multiple battery cells) is transferred to a hot-pressing device for hot-pressing, so that the diaphragm and the pole piece of each battery cell are hot-pressed together. Because every two adjacent electric cores are separated by the partition board, the membranes between the two adjacent electric cores cannot be adhered together during hot pressing. Compared with the prior art, the battery cell laminating method can continuously stack a plurality of battery cells at one time, and then send the plurality of battery cells into the hot-pressing equipment for hot pressing together, thereby greatly improving the production efficiency and better meeting the production requirement.

Drawings

Fig. 1 is a flowchart of a cell lamination method according to an embodiment of the present invention;

fig. 2 is a diagram illustrating step S10 in the lamination method of the battery cell shown in fig. 1;

fig. 3-1 to 3-10 are diagrams illustrating steps of a method for laminating battery cells according to an embodiment of the present invention;

fig. 4-1 to 4-7 are diagrams illustrating steps of a lamination method of a cell according to another embodiment of the present invention;

fig. 5-1 to 5-8 are diagrams illustrating steps of a method for laminating a cell according to another embodiment of the present invention;

fig. 6-1 to 6-8 are diagrams illustrating steps of a cell lamination method according to another embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited 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 or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, fig. 2, and fig. 3-1 to fig. 3-10, an embodiment of the present invention provides a method for laminating battery cells, including the steps of:

s10, unwinding the output diaphragm 11, and enabling the diaphragm 11 to pass through a stacking station; wherein the material at the stacking station is a lamination unit 100, the lamination unit 100 having opposing first and

second sides

101, 102.

Specifically, the unwinding mechanism 10 unwinds the output diaphragm 11. The gripping mechanism 40 grips the leading end of the separator 11 and pulls the separator 11 over the stacking station until the length of the separator 11 over the stacking station reaches a preset length. It should be noted that the preset length can be set according to practical situations, as long as the length of the separator 11 located downstream of the stacking station meets the length required for molding the battery cell 103, and is not limited herein.

S20, the pole pieces 12 are respectively applied to the first side 101 and the second side 102 of the lamination unit 100 to form a new lamination unit 100, that is to say, the lamination unit 100 now comprises the diaphragm 11 and the two pole pieces 12.

Specifically, the two pole pieces 12 are conveyed to the stacking station by the conveying mechanism 20, and the two pole pieces 12 are respectively attached to the first side 101 and the second side 102 of the lamination unit 100.

S30, the new lamination unit 100 is rotated 180 ° to draw the membrane 11 located downstream on the stacking station to wrap around the first side 101 and the second side 102 of the lamination unit 100, respectively.

Specifically, the lamination unit 100 is clamped using the rotary jaw mechanism 30 and then the lamination unit 100 is rotated 180 ° such that the pole pieces 12 of both the first side 101 and the second side 102 of the lamination unit 100 are covered by the diaphragm 11.

And S40, sequentially circulating the steps S20 to S30 until the stacked lamination unit 100 comprises a plurality of battery cells 103, wherein each battery cell 103 comprises a multilayer diaphragm 11 and a multilayer pole piece 12. And, at least one of the two pole pieces 12 may be selectively replaced with the separator 13 when the step S20 is executed in a loop, so that the separator 13 is provided between every two adjacent battery cells 103 of the lamination unit 100. That is, each separator 13 in the lamination unit 100 spaces adjacent two battery cells 103 apart.

In the lamination method for the battery cell, after the first side 101 and the second side 102 of the lamination unit 100 are attached to the pole pieces 12, the lamination unit 100 is rotated by 180 °, the membranes 11 upstream and downstream of the drawing and stacking station are wound on the pole pieces 12 on the first side 101 and the second side 102 of the lamination unit 100 respectively (i.e., the membranes 11 are stacked on two pole pieces 12), and then more pole pieces 12 and membranes 11 are stacked on the first side 101 and the second side 102 of the lamination unit 100 cyclically. When the current battery cells 103 are completely stacked and the step S20 is continuously executed in a circulating manner, the pole pieces 12 are replaced by the separator 13, that is, the separator 13 is attached to the first side 101 and/or the second side 102 of the lamination unit 100, and then the molding of more battery cells 103 is continued in the same manner. After the plurality of battery cells 103 are formed, the whole lamination unit 100 (including the plurality of battery cells 103) is transferred to a hot-pressing device for hot-pressing, so as to hot-press the diaphragm 11 and the pole piece 12 of each battery cell 103 together. Because each two adjacent battery cells 103 are separated by the partition plate 13, the separators 11 between the two adjacent battery cells 103 are not adhered together during the hot pressing. Compared with the prior art, the method for laminating the battery cells can continuously stack a plurality of battery cells 103 at one time, and then send the battery cells 103 into hot-pressing equipment together for hot pressing, so that the production efficiency is greatly improved, and the production requirement can be better met.

It will be understood that the above materials are referred to as the separator 11, the pole piece 12 and the separator 13. That is, lamination unit 100 includes only diaphragm 11 at the beginning of stacking, and lamination unit 100 includes diaphragm 11, pole piece 12, and separator 13 as stacking continues. Alternatively, when the first side 101 of the lamination unit 100 is directed upward and the second side 102 is directed downward, the first side 101 of the lamination unit 100 is rotated to be directed downward while the second side 102 is rotated to be directed upward after the step S30 is performed once.

In specific embodiments, the separator 13 may be made of a steel plate, for example, a manganese steel plate, to ensure that the separator 13 does not adhere to the separator 11 when hot pressing is performed, so that after the hot pressing is completed, each battery cell 103 can be conveniently separated, and the separator 13 can be recovered for the next use.

Further, the length and width dimensions of the separator 13 are greater than those of the pole piece, thereby ensuring that two adjacent cells 103 can be completely isolated.

Referring to fig. 4-1, in an embodiment, when the first battery cell 103 with an even number of pole pieces N is formed by stacking (i.e., when the first battery cell 103 is formed by stacking, the number of pole pieces of the first battery cell 103 is an even number N): when step S20 is executed in the N/2+1 th cycle, the separator 13 is attached to both the first side 101 and the second side 102. In this manner, the first cell 103 of the lamination unit 100 is spaced apart from the second cell 103 and the third cell 103 by the separator 13. Specifically, in the embodiment shown in fig. 4-1, the first battery cell 103 includes four pole pieces (i.e., N is 4), so that the separator 13 is attached to both the first side 101 and the second side 102 when step S20 is executed at the 3 rd time.

Referring to fig. 3-1 to fig. 3-4, in an embodiment, when the first battery cell 103 with the odd number of pole pieces M is formed by stacking (i.e., when the first battery cell 103 is formed by stacking, the number of pole pieces of the first battery cell 103 is an odd number M): when step S20 is executed in the (M +1)/2 th cycle, the separator 13 is attached to the first side 101, and the pole piece 12 is attached to the second side 102. When step S20 is executed in the [ (M +1)/2] +1 th cycle, the pole piece 12 is bonded to the first side 101 and the separator 13 is bonded to the second side 102. In this manner, the first cell 103 of the lamination unit 100 is spaced apart from the second cell 103 and the third cell 103 by the separator 13. Specifically, in the embodiment shown in fig. 3-1 to 3-4, the number of pole pieces of the first battery cell 103 is 5 (i.e., M is 5), and when step S20 is executed for the 3 rd time, the separator 13 is attached to the first side 101, and the pole piece 12 is attached to the second side 102. When step S20 is executed at the 4 th time, the pole piece 12 is bonded to the first side 101, and the separator 13 is bonded to the second side 102.

In another embodiment, when the first battery cell 103 with the odd number M of pole pieces is formed by stacking: when step S20 is executed in the (M +1)/2 th cycle, the pole piece 12 is attached to the first side 101, and the separator 13 is attached to the second side 102. When step S20 is executed in the [ (M +1)/2] +1 th cycle, the separator 13 is bonded to the first side 101 and the pole piece 12 is bonded to the second side 102. In this manner, the first cell 103 of the lamination unit 100 is spaced apart from the second cell 103 and the third cell 103 by the separator 13.

Specifically, in the embodiment, when the first battery cell 103 is completely stacked and the subsequent battery cells 103 are continuously stacked and molded on the first side 101 and the second side 102:

when the stacking of the current cell 103 on the first side 101 is completed, the separator 13 is attached to the first side 101 when the step S20 is executed in the next cycle, so that the current cell 103 is separated from the next cell 103 adjacent to the current cell 103 by the separator 13. When the stacking of the current cell 103 on the second side 102 is completed, the separator 13 is attached to the second side 102 when the step S20 is executed in the next cycle, so that the current cell 103 is separated from the next cell 103 adjacent to the current cell 103 by the separator 13.

In the embodiments shown in fig. 3 to 8 to 3 to 10, when the stacking of the pole pieces 12 of the second battery cell 103 located on the first side 101 is completed (see fig. 3 to 8), the separator 13 is attached to the first side 101 (see fig. 3 to 9) when the step S20 is executed next time. When the stacking of the pole pieces 12 of the third battery cell 103 on the second side 102 is completed (see fig. 3 to 9), the separator 13 is attached to the second side 102 (see fig. 3 to 10) when the step S20 is executed next time.

Referring to fig. 3-10, in one embodiment, after step S40, the method further includes the steps of:

s50, the diaphragm 11 connected to the first side 101 is cut, and the diaphragm 11 connected to the second side 102 is cut. In this manner, after all the cells 103 are formed, the separator 11 connected to the first side 101 and the second side 102 of the lamination unit 100 is cut by the cutting mechanism 60, i.e., the lamination unit 100 (i.e., a plurality of cells) is separated from the upstream and downstream separators 11, so that the lamination unit 100 is transferred to a hot-pressing apparatus for hot-pressing.

Since the cells 103 of the first side 101 and the cells 103 of the second side 102 of the lamination unit 100 may not be stacked at the same time, there may be cases where they are completed sequentially. Thus, in other embodiments, referring to fig. 6-7 through 6-8, the separator 11 coupled to the first side 101 of the lamination unit 100 is cut after the last cell 103 of the first side 101 of the lamination unit 100 is stacked. When the stacking of the last cell 103 of the second side 102 of the lamination unit 100 is completed, the separator 11 coupled to the second side 102 of the lamination unit 100 is cut. Therefore, after all the battery cells 103 on one side are completely stacked, the diaphragm 11 on the side is continuously pulled to perform ineffective winding during rotation, and saving of the diaphragm 11 is facilitated.

In an embodiment, after step S40, the method further includes the steps of:

s60, the diaphragm 11 exposed between the first side 101 and the second side 102 of the lamination unit 100 is cut. In this manner, the separators 11 between the respective battery cells 103 of the lamination unit 100 are cut off, so that the respective battery cells 103 are separated from each other, so as to separate the respective battery cells 103 after the hot pressing.

It should be noted that the order of steps S50 and S60 is not limited, and may be executed simultaneously, or step S50 may be executed first and then step S60 is executed, or step S60 may be executed first and then step S50 is executed.

With continued reference to fig. 3-1 to 3-10, in an embodiment, when step S20 is executed in the kth cycle, the positive electrode tab is attached to the first side 101, and the negative electrode tab is attached to the second side 102. In the case where step S20 is executed in the K +1 th cycle, the negative electrode tab is bonded to the first side 101 and the positive electrode tab is bonded to the second side 102. Wherein K is a positive integer greater than or equal to 1. In this way, the pole pieces 12 of each battery cell 103 of the lamination unit 100 are ensured to be alternately arranged in the positive pole piece, the negative pole piece, the positive pole piece and the negative pole piece … …. Note that the positive electrode tab or the negative electrode tab in step S20 may be replaced with the separator 13 as needed to ensure that the separator 13 is spaced between every two battery cells 103 in the lamination unit 100.

In particular embodiments, during the performance of step S30 in the ith cycle, lamination unit 100 is rotated 180 ° in the first rotation direction; during the execution of step S30 in the (i +1) th cycle, lamination unit 100 rotates 180 ° in the first rotation direction; wherein i is a positive integer. That is, each time step S30 is performed, the rotation direction of the lamination unit 100 is the same as the previous time step S30 was performed. In this manner, because the lamination units 100 rotate in the same direction, no reversal is required, thereby facilitating a simplified construction of the rotary jaw mechanism 30.

Referring to fig. 6-1 to 6-8, of course, in other embodiments, during the ith cycle of performing step S30, lamination unit 100 is rotated 180 ° in the first rotation direction; during the execution of step S30 in the (i +1) th cycle, lamination unit 100 is rotated 180 ° in a second sense of rotation opposite to the first sense of rotation; wherein i is a positive integer. That is, each time step S30 is performed, the rotation direction of the lamination unit 100 is opposite to the previous time step S30 was performed. In this way, the lamination unit 100 is rotated in a rotation direction alternating manner, so that only one side of each partition plate 13 in the lamination unit 100 is wrapped by the diaphragm 11, and therefore, only the diaphragm 11 on one side of each partition plate 13 needs to be cut in step S60.

Referring to fig. 2, in an embodiment, step S20 specifically includes:

respectively carrying two pole pieces 12 to a first side 101 and a second side 102 of a lamination unit 100, and positioning and correcting the pole pieces 12 in the process of carrying the pole pieces 12;

the two pole pieces 12 are respectively attached to the first side 101 and the second side 102 of the lamination unit 100. Therefore, the chip mounting precision of the pole piece 12 is improved, and the quality of the battery cell is improved.

Further, the carrying mechanism 20 carries the pole piece 12 to the positioning platform 50, the positioning platform 50 is used to position and correct the deviation of the pole piece 12, and then the carrying mechanism 20 attaches the pole piece 12 on the positioning platform 50 to the first side 101 and the second side 102 of the lamination unit 100.

Further, a deviation correcting mechanism can be arranged on the carrying mechanism 20, and the deviation correcting mechanism is used for positioning and correcting the deviation of the pole piece 12 in the process that the carrying mechanism 20 carries the pole piece 12 to the lamination unit 100, so that the carrying process is smoother, waiting is not needed, time is saved, and efficiency is improved.

It should be noted that, in another embodiment, the positioning platform 50 and the deviation rectifying mechanism may be disposed at the same time, the positioning platform 50 is used to perform preliminary positioning deviation rectifying on the pole piece 12, and the deviation rectifying mechanism is used to perform precise positioning deviation rectifying on the pole piece 12.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for laminating a cell, comprising:

c. rotating the new lamination unit by 180 ° to draw the diaphragms located upstream and downstream of the stacking station to wrap respectively over the first and second sides of the lamination unit;

d. sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cells, wherein each battery cell comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces; and optionally replacing at least one of the two pole pieces with a separator when step b is executed in a circulating manner, so that the separator is arranged between every two adjacent battery cells of the lamination unit.

2. The method for laminating the battery cells according to claim 1, wherein step a specifically comprises:

3. The cell lamination method of claim 1, wherein, in the process of stacking and forming the first cell with an even number N of pole pieces: and when the step b is executed in the (N/2 +1) th cycle, the separator is attached to the first side and the second side.

4. The cell lamination method of claim 1, wherein, in the process of stacking and forming the first cell with the odd number M of pole pieces: when the step b is executed in the (M +1)/2 th cycle, the separator is attached to the first side, and the pole piece is attached to the second side; when the step b is executed in the [ (M +1)/2] +1 th cycle, the pole piece is attached to the first side, and the separator is attached to the second side; or

5. The method of laminating battery cells of claim 1, wherein, during the process of completing the first battery cell stack and continuing to stack and mold the subsequent battery cells on the first side and the second side:

6. The method for laminating the battery cell of claim 1, wherein after the step d, the method further comprises the steps of:

7. The cell lamination method of claim 1, wherein the separator connected to the first side of the lamination unit is cut off after the last cell stack of the first side is completed;

8. The method for laminating the battery cells according to claim 1, wherein in the step b of the Kth cycle, a positive plate is attached to the first side, and a negative plate is attached to the second side; when the step b is executed in the K +1 th cycle, attaching a negative plate to the first side, and attaching a positive plate to the second side;

wherein K is a positive integer greater than or equal to 1.

9. The method for laminating the battery cell of claim 1, wherein after the step d, the method further comprises the steps of:

10. The lamination method of a cell according to any one of claims 1 to 9, wherein during the i-th cycle of performing step c, the lamination unit is rotated 180 ° in the first rotation direction; during the execution of step c in the (i +1) th cycle, the lamination unit is rotated by 180 ° in the first rotation direction; or

During the performance of step c in the ith cycle, the lamination unit is rotated 180 ° in the first rotation direction; during the execution of step c in the (i +1) th cycle, the lamination unit is rotated by 180 ° in a second sense of rotation opposite to the first sense of rotation;

wherein i is a positive integer.