CN114243119A - Lamination method of battery cell - Google Patents

Lamination method of battery cell Download PDF

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Publication number
CN114243119A
CN114243119A CN202111399622.2A CN202111399622A CN114243119A CN 114243119 A CN114243119 A CN 114243119A CN 202111399622 A CN202111399622 A CN 202111399622A CN 114243119 A CN114243119 A CN 114243119A
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China
Prior art keywords
lamination unit
pole piece
lamination
pole pieces
executed
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CN202111399622.2A
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Chinese (zh)
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不公告发明人
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Wuxi Lead Intelligent Equipment Co Ltd
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Wuxi Lead Intelligent Equipment Co Ltd
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Priority to CN202111399622.2A priority Critical patent/CN114243119A/en
Publication of CN114243119A publication Critical patent/CN114243119A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a lamination method of a battery cell. The lamination method of the battery cell comprises the following steps: a. conveying the diaphragm to a stacking station; b. attaching a pole piece to the first side or the second side of the lamination unit by using a handling device; c. rotating the lamination unit 180 ° in a first rotation direction to draw a membrane located upstream of the stacking station to wrap around a conforming pole piece overlying the first or second side of the lamination unit; d. and c, sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cells, each battery cell comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces, the pole pieces are attached to one of the first side and the second side when the step b is executed in the previous circulation, the pole pieces are attached to the other one of the first side and the second side when the step b is executed in the next circulation, and the pole pieces can be selectively replaced by the partition plates when the step b is executed in the circulation, so that the partition plates are 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 conventional 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 requirement.
Disclosure of Invention
Therefore, it is necessary to provide a method for stacking battery cells, which can improve the above-mentioned defects, in order to solve the problems that in the prior art, only one battery cell can be stacked, and then the battery cell is sent into a hot-pressing device for hot-pressing, which seriously affects the production efficiency and cannot meet the production requirements.
A method of stacking cells, comprising:
a. conveying the diaphragm to a stacking station; wherein the material at the stacking station is a lamination unit comprising opposing first and second sides;
b. attaching pole pieces to the first side or the second side of the lamination unit using a handling device to form a new lamination unit;
c. rotating the lamination unit 180 ° in a first rotation direction to draw a membrane located upstream of the stacking station to wrap around a conforming pole piece overlying the first or second side of the lamination unit;
d. and c, sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cells, each battery cell comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces, the pole pieces are attached to one of the first side and the second side when the step b is executed in the previous circulation, the pole pieces are attached to the other one of the first side and the second side when the step b is executed in the next circulation, and the pole pieces can be selectively replaced by partition plates when the step b is executed in the next circulation, so that a partition plate is arranged between every two adjacent battery cells of the lamination unit.
In one embodiment, step a includes:
and unreeling the output diaphragm to the stacking station until the starting end of the diaphragm reaches the stacking station.
In one embodiment, after a first molded cell is stacked, and during the process of stacking and molding subsequent cells on the first side and the second side of the lamination unit, the method further comprises:
if the current battery core on the first side of the lamination unit is completely stacked, a partition plate is attached to the first side of the lamination unit when the step b is executed in the 2 nd cycle;
if the current battery core stacking on the second side of the lamination unit is completed, a separator is attached to the second side of the lamination unit when the step b is executed in the 2 nd cycle.
In one embodiment, in the process of stacking the first battery cell, the carrying device sequentially and circularly attaches pole pieces with corresponding polarities to the first side or the second side by taking a positive pole piece, a negative pole piece and a positive pole piece as a circulating unit, so that the pole pieces of the first battery cell are alternately stacked in a positive-negative mode, and a diaphragm is arranged between every two adjacent pole pieces; or
In the process of stacking the first battery cell, the carrying device sequentially and circularly attaches the pole pieces with the corresponding polarities to the first side or the second side by taking the negative pole piece, the positive pole piece and the negative pole piece as a circulating unit so as to enable the pole pieces of the first battery cell to be alternately stacked in a positive-negative mode, and a diaphragm is arranged between every two adjacent pole pieces.
In one embodiment, after the first cell stack is completed, and the process of stacking and molding the subsequent cells on the first side and the second side is continued:
the carrying device sequentially and circularly attaches the pole pieces with the corresponding polarities to the first side or the second side by taking the positive pole piece, the negative pole piece and the positive pole piece as circulating units; or
The carrying device sequentially and circularly attaches the pole pieces with the corresponding polarities to the first side or the second side by taking the negative pole piece, the positive pole piece and the negative pole piece as circulating units; or
The carrying device sequentially and circularly attaches the pole pieces with the corresponding polarities to the first side or the second side by taking the negative pole piece, the positive pole piece and the positive pole piece as circulating units; or
And the carrying device sequentially and circularly attaches the pole pieces with the corresponding polarities to the first side or the second side by taking the positive pole piece, the negative pole piece and the negative pole piece as the lamination unit.
In one embodiment, after step d, the method further comprises the steps of:
cutting off the diaphragm exposed to both sides of the lamination unit in the first direction; wherein a direction of the first side pointing towards the second side and an axis of rotation of the lamination unit are perpendicular to the first direction.
After the pole pieces are attached to the first side of the lamination unit, the diaphragm on the upstream of the stacking station is drawn to wind on the pole pieces on the first side of the lamination unit (namely, the diaphragm is stacked on the pole pieces on the first side) by rotating the lamination unit by 180 degrees along the first rotation direction, and then more pole pieces and diaphragms are stacked on the first side and the second side of the lamination unit respectively in a circulating manner. When the current battery cell is completely stacked and the step b is continuously and circularly executed, replacing the pole piece with a partition plate, namely fitting the partition plate to the first side or the second side of the lamination unit, and then continuously forming more battery cells in the same manner, namely continuously stacking and forming a plurality of battery cells at one time. 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 method for laminating the battery cells can continuously stack and form a plurality of battery cells at one time without stopping the machine, and can send the plurality of battery cells into hot-pressing equipment together for hot pressing, thereby greatly improving the production efficiency and better meeting the production requirement.
A method of laminating a cell, comprising the steps of:
a. conveying the diaphragm to a stacking station; wherein the material at the stacking station is a lamination unit comprising opposing first and second sides;
b. attaching a pole piece to the first side of the lamination unit by using a handling device to form a new lamination unit;
c. rotating the lamination unit by 180 ° in a first rotation direction or in a second rotation direction opposite to the first rotation direction, to draw a membrane located upstream of the stacking station to wrap around a pole piece fitted over the first side of the lamination unit;
d. and c, sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cells, each battery cell comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces, the lamination unit rotates 180 degrees along the first rotation direction when the step c is executed at the previous time, the lamination unit rotates 180 degrees along the second rotation direction when the step c is executed at the next time, and optionally, the pole pieces are replaced by partition plates when the step b is executed cyclically, so that a partition plate is arranged between every two adjacent battery cells of the lamination unit.
In one embodiment, if the current cell stack of the lamination unit is completed, a separator is attached to the first side of the lamination unit when step b is performed in the 1 st cycle thereafter.
In one embodiment, if the positive electrode plate is attached to the first side of the lamination unit when step b is executed in the k-th cycle, the negative electrode plate is attached to the first side of the lamination unit when step b is executed in the (k + 1) -th cycle;
wherein k is a positive integer.
In one embodiment, after step d, the method further comprises the steps of:
cutting off the diaphragm exposed to both sides of the lamination unit in the first direction; wherein a direction in which the first side points to the second side and a direction of rotation of the lamination unit are perpendicular to the first direction.
According to the method for laminating the battery core, after the pole piece is attached to the first side of the lamination unit, the diaphragm on the upstream of the stacking station is drawn to wind on the pole piece on the first side of the lamination unit (namely, the diaphragm is stacked on the pole piece on the first side) in a mode that the lamination unit rotates 180 degrees along the first rotation direction, then the pole piece is attached to the first side of the lamination unit, and then the lamination unit rotates 180 degrees along the second rotation direction, so that more pole pieces and diaphragms are circularly stacked on the first side of the lamination unit. When the current battery cell is completely stacked and the step b is continuously and circularly executed, replacing the pole piece with a partition plate, namely fitting the partition plate to the first side of the lamination unit, and then continuously forming more battery cells in the same manner, namely continuously stacking and forming a plurality of battery cells at one time. 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 method for laminating the battery cells can continuously stack and form a plurality of battery cells at one time without stopping the machine, and can send the plurality of battery cells into hot-pressing equipment together for hot pressing, 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 a first embodiment of the present invention;
fig. 2-1 through 2-16 are illustrations of a lamination process for the cell shown in fig. 1;
fig. 3 is a flowchart of a lamination method of a cell in a second embodiment of the present invention;
fig. 4-1 through 4-11 are illustrations of a lamination process for the cell shown in fig. 3.
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 and fig. 2-1 to fig. 2-16, a method for stacking battery cells according to a first embodiment of the present invention includes:
s10, conveying the diaphragm 11 to a stacking station; wherein the material at the stacking station is a lamination unit 10, the lamination unit 10 comprising opposing first and second sides 111, 112.
Specifically, the unwinding mechanism is used for unwinding the output diaphragm 11 to the stacking station until the starting end of the diaphragm 11 reaches the stacking station. The material at the stacking station is now the leading end of the membrane 11, which is the lamination unit 10 at this point in time.
S20, attaching the pole piece 12 to the first side 111 or the second side 112 of the lamination unit 10 by using a handling device to form a new lamination unit 10. Specifically, the pole piece 12 is conveyed to the stacking station by the conveying mechanism, and the pole piece 12 is attached to the upper side (i.e., the first side 111 or the second side 112) of the lamination unit 10. The materials at the stacking station are now a membrane 11 and a pole piece 12, and the lamination unit 10 now includes the membrane 11 and the pole piece 12.
S30, the lamination unit 10 is rotated 180 ° in the first sense of rotation a1 by means of the rotating jaws to draw the membrane 11 upstream of the stacking station to wrap around the pole piece 12 applied on the first side 111 or on the second side 112 of the lamination unit 10.
In this manner, after the pole pieces 12 are attached to the first side 111 of the lamination unit 10 in step S20, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 in step S30 so that the separator 11 upstream is drawn to wrap around the pole pieces 12 covering the first side 111 of the lamination unit 10.
After the pole piece 12 is attached to the second side 112 of the rotary unit in step S20, the lamination unit 10 is rotated 180 ° in the first sense of rotation a1 in step S30 so that the upstream diaphragm 11 is drawn to wrap around the pole piece 12 covering the second side 112 of the lamination unit 10.
And S40, sequentially circulating the steps S20 to S30 until the stacked lamination unit 10 comprises a plurality of battery cells 101, wherein each battery cell 101 comprises a multilayer diaphragm 11 and a multilayer pole piece 12. The pole piece 12 is attached to one of the first side 111 and the second side 112 when the step S20 is performed in the previous cycle, and the pole piece 12 is attached to the other of the first side 111 and the second side 112 when the step S20 is performed in the next cycle. Also, the pole piece 12 may be selectively replaced with the separator 13 while the step S20 is cyclically executed.
That is, the pole piece 12 is attached to one of the first side 111 and the second side 112 of the lamination unit 10 when step S20 is performed in the ith cycle. The pole piece 12 is attached to the other of the first side 111 and the second side 112 of the lamination unit 10 when step S20 is executed in the (i + 1) th cycle. Wherein i is a positive integer.
It should be noted that, when the step S20 is executed in a loop, the pole piece 12 is replaced by the separator 13, which includes three cases, in the first case, when the first cell is stacked, the separator 13 is attached to the first side 111 and the second side 112 in the next two steps of executing step S20, so that the first side 111 and the second side 112 of the first cell 101 both have the separator 13; in the second case, in the process of continuously stacking the subsequent battery cells 101 after the first battery cell 101 is stacked, after the current battery cell 101 on the first side 111 of the lamination unit 10 is stacked, when the lamination unit 10 rotates again until the first side 111 faces upward, the separator 13 is attached to the first side 111 of the lamination unit 10; the third situation is that in the process of continuing to stack the subsequent battery cells 101 after the first battery cell 101 is stacked, after the current battery cell 101 on the second side 112 of the lamination unit 10 is stacked, when the lamination unit 10 is rotated again until the second side 112 faces upward, the separator 13 is attached to the second side 112 of the lamination unit 10.
In the lamination method for the battery cell, after the pole piece 12 is attached to the first side 111 of the lamination unit 10, the membrane 11 upstream of the stacking station is drawn around the pole piece 12 on the first side 111 of the lamination unit 10 (i.e. the membrane 11 is stacked on the pole piece 12 on the first side 111) by rotating the lamination unit 10 by 180 ° in the first rotation direction a1, and then more pole pieces 12 and membranes 11 are stacked on the first side 111 and the second side 112 of the lamination unit 10 in this cycle. When the current battery cells 101 are completely stacked and step S20 is continuously and cyclically executed, the pole pieces 12 are replaced with the separators 13, that is, the separators 13 are attached to the first side 111 or the second side 112 of the lamination unit 10, and then more battery cells 101 are continuously formed in the same manner, that is, a plurality of battery cells 101 can be continuously stacked and formed at a time. After the molding of the plurality of battery cells 101 is completed, the whole lamination unit 10 (including the plurality of battery cells 101) 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 101 together. Because each two adjacent battery cells 101 are separated by the partition plate 13, the separators 11 between the two adjacent battery cells 101 are not adhered together during the hot pressing.
Compared with the prior art, the lamination method of the battery core 101 can continuously stack a plurality of battery cores 101 at one time without stopping the machine, and can send the plurality of battery cores 101 into hot-pressing equipment together for hot pressing, thereby greatly improving the production efficiency and better meeting the production requirement.
The materials are referred to as a separator 11, a pole piece 12, and a separator 13. Thus initially, lamination unit 10 includes only the leading end of diaphragm 11, and as steps S20 and S30 are cyclically performed, the material at the stacking station is gradually increased, i.e., diaphragm 11, pole piece 12 and separator 13 of lamination unit 10 are also gradually increased.
In specific embodiments, the separator 13 may be made of a steel plate, such as 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, the battery cells 101 can be conveniently separated from each other, and the separator 13 is recovered for the next use.
Further, the length and width dimensions of the partition 13 are greater than those of the pole piece 12, so as to ensure that two adjacent battery cells 101 can be completely isolated.
Specifically, in the embodiment, when the first molded battery cell 101 is completely stacked, and the first side 111 and the second side 112 of the lamination unit 10 continue to be stacked to mold the subsequent battery cells 101:
if the stacking of the current battery cells 101 on the first side 111 of the lamination unit 10 is completed, the separator 13 is attached to the first side 111 of the lamination unit 10 when step S20 is executed in the subsequent 2 nd cycle. That is, if the current cell 101 on the first side 111 of the lamination unit 10 is completely stacked after the jth cycle of performing the step S20, the separator 13 is attached to the first side 111 of the lamination unit 10 when the jth +2 cycle of performing the step S20, so that the current cell 101 and the next cell 101 on the first side 111 of the lamination unit 10 are separated by the separator 13, and the two cells 101 are prevented from being bonded together during the hot pressing. Wherein j is a positive integer.
If the stacking of the current battery cells 101 on the second side 112 of the lamination unit 10 is completed, the separator 13 is attached to the second side 112 of the lamination unit 10 when step S20 is executed in the subsequent 2 nd cycle. That is, if the current cell 101 on the second side 112 of the lamination unit 10 is completely stacked after the h-th cycle of step S20 is performed, when step S20 is performed on the h + 2-th cycle, the partition plate 13 is attached to the second side 112 of the lamination unit 10, so that the current cell 101 and the next cell 101 on the second side 112 of the lamination unit 10 are separated by the partition plate 13, and the two cells 101 are prevented from being bonded together during the hot pressing. Wherein h is a positive integer.
Specifically, in the embodiment, in the process of stacking the first battery cell 101, the carrying device sequentially and circularly attaches the pole pieces 12 with corresponding polarities to the first side 111 or the second side 112 according to the cycle unit that is a positive pole piece, a negative pole piece, and a positive pole piece, so that the pole pieces 12 of the first molded battery cell 101 are stacked alternately in the positive direction and the negative direction, and a diaphragm 11 is disposed between every two adjacent pole pieces 12. In this way, the pole pieces 12 of the first cell 101 formed by stacking are alternately stacked on each other according to the positive pole piece and the negative pole piece.
In other embodiments, in the process of stacking the first battery cell 101, the carrying device sequentially and circularly attaches the pole pieces 12 with corresponding polarities to the first side 111 or the second side 112 by using the negative pole piece, the positive pole piece, and the negative pole piece as a circulating unit, so that the pole pieces 12 of the first battery cell 101 are stacked alternately in the positive and negative directions, and a diaphragm 11 is disposed between every two adjacent pole pieces 12. In this way, the pole pieces 12 of the first cell 101 formed by stacking are alternately stacked on each other according to the positive pole piece and the negative pole piece.
Specifically, in the embodiment, when the first battery cell 101 is completely stacked and the first side 111 and the second side 112 are continuously stacked to form a subsequent battery cell, the handling device sequentially and circularly attaches the pole piece 12 with the corresponding polarity to the first side 111 or the second side 112 by using the positive pole piece, the negative pole piece, and the positive pole piece as the circulating unit. In this way, the pole pieces 12 of each of the cells 101 subsequent to the first cell 101 are alternately stacked on each other according to the positive pole piece 12 and the negative pole piece 12.
In another embodiment, when the first battery cell 101 is completely stacked and the first side 111 and the second side 112 are continuously stacked to form a subsequent battery cell, the handling device sequentially and circularly attaches the pole piece 12 with the corresponding polarity to the first side 111 or the second side 112 by using the negative pole piece, the positive pole piece, and the negative pole piece as a circulation unit. In this way, the pole pieces 12 of the respective battery cells 101 after the first battery cell 101 are alternately stacked on each other according to the positive pole piece and the negative pole piece.
In another embodiment, when the first battery cell 101 is completely stacked and the first side 111 and the second side 112 are continuously stacked to form a subsequent battery cell, the handling device sequentially and circularly attaches the pole piece 12 with the corresponding polarity to the first side 111 or the second side 112 by using the negative pole piece, the positive pole piece, and the positive pole piece as the circulating units. In this way, the pole pieces 12 of the respective battery cells 101 after the first battery cell 101 are alternately stacked on each other according to the positive pole piece and the negative pole piece.
In another embodiment, when the first battery cell 101 is completely stacked and the first side 111 and the second side 112 are continuously stacked to form a subsequent battery cell, the handling device sequentially and circularly attaches the pole piece 12 with the corresponding polarity to the first side 111 or the second side 112 by using the positive pole piece, the negative pole piece, and the negative pole piece as the circulating unit. In this way, the pole pieces 12 of the respective battery cells 101 after the first battery cell 101 are alternately stacked on each other according to the positive pole piece and the negative pole piece.
It should be noted that, when step S20 is executed, the positive electrode tab or the negative electrode tab may be replaced by the separator 13, so that the separator 13 is disposed at an interval between every two adjacent battery cells 101 in the lamination unit 10.
In an embodiment, after step 40, the method further includes the steps of:
s50, the diaphragm 11 exposed to both sides of the lamination unit 10 in the first direction is cut off using the cutting device 20. Wherein the direction in which the first side 111 of the lamination unit 10 points towards the second side 112 and the axis of rotation of the lamination unit 10 are both perpendicular to this first direction. That is, the diaphragm 11 exposed between the first side 111 and the second side 112 of the lamination unit 10 is cut off using the cutoff device 20. In this manner, the separators 11 between the respective battery cells 101 of the lamination unit 10 are cut off so that the respective battery cells 101 are separated from each other, so as to separate the respective battery cells 101 after the hot pressing. In the embodiment illustrated in fig. 2-16, the first direction is a left-right direction.
In an embodiment, after step 40, the method further includes the steps of:
s60, the separator 11 connected to the lamination unit 10 is cut by the cutting device 20. In this way, after all the battery cells 101 are formed, the separator 11 connected to the lamination unit 10 is cut by the cutting device 20, that is, the lamination unit 10 is separated from the upstream separator 11, so that the lamination unit 10 is transferred to a hot-pressing apparatus for 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.
In an embodiment, step S20 specifically includes:
the carrying device carries the pole piece 12 to the stacking station, and carries out positioning and deviation correction on the pole piece 12 in the process of carrying the pole piece 12;
the pole piece 12 is attached to the first side 111 or the second side 112 of the lamination unit 10. Therefore, the chip mounting precision of the pole piece 12 is improved, and the quality of the battery cell 101 is improved.
Further, the carrying mechanism carries the pole piece 12 to a positioning platform, the positioning platform is used for positioning and correcting the deviation of the pole piece 12, and then the carrying mechanism attaches the pole piece 12 on the positioning platform to the first side 111 or the second side 112 of the lamination unit 10.
Furthermore, a deviation rectifying mechanism can be arranged on the carrying mechanism, the deviation rectifying mechanism is used for positioning and rectifying the deviation of the pole piece 12 in the process that the carrying mechanism carries the pole piece 12 to the lamination unit 10, 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 and the deviation rectifying mechanism may be disposed at the same time, the positioning platform 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.
In the embodiment shown in fig. 2-1 to 2-16, firstly, the membrane 11 is unreeled to the stacking station by the unreeling mechanism, so that the starting end of the membrane 11 (i.e. the lamination unit 10) is located at the stacking station, and a positive electrode sheet 12 is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by using the rotating jaws, and one negative electrode tab 12 is attached to the second side 112 (upper side) of the lamination unit 10 by using the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and one negative electrode tab 12 is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by using the rotating jaws, and one positive electrode tab 12 is attached to the second side 112 (upper side) of the lamination unit 10 by using the handling device. Then, lamination unit 10 is rotated 180 ° in first rotation direction a1 by means of the rotating jaws and a spacer 13 is applied to first side 111 (upper side) of lamination unit 10 by means of the handling device. Then, lamination unit 10 is rotated 180 ° in first sense of rotation a1 by means of the rotating jaws and a spacer 13 is applied to second side 112 (upper side) of lamination unit 10 by means of the handling device.
Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and one positive electrode tab 12 is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by using the rotating jaws, and one negative electrode tab 12 is attached to the second side 112 (upper side) of the lamination unit 10 by using the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and one negative electrode tab 12 is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by using the rotating jaws, and one positive electrode tab 12 is attached to the second side 112 (upper side) of the lamination unit 10 by using the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and one positive electrode tab 12 is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by using the rotating jaws, and one negative electrode tab 12 is attached to the second side 112 (upper side) of the lamination unit 10 by using the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and one negative electrode tab 12 is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by using the rotating jaws, and one positive electrode tab 12 is attached to the second side 112 (upper side) of the lamination unit 10 by using the handling device. Then, lamination unit 10 is rotated 180 ° in first rotation direction a1 by means of the rotating jaws and a spacer 13 is applied to first side 111 (upper side) of lamination unit 10 by means of the handling device. Then, lamination unit 10 is rotated 180 ° in first sense of rotation a1 by means of the rotating jaws and a spacer 13 is applied to second side 112 (upper side) of lamination unit 10 by means of the handling device.
Finally, the diaphragm 11 between the lamination unit 10 and the unwinding mechanism is cut, and the diaphragm 11 exposed to both sides of the lamination unit 10 in the first direction (i.e., the left-right direction) is cut.
Referring to fig. 3 and fig. 4-1 to 4-11, a method for stacking battery cells is further provided in a second embodiment of the present invention, and for convenience of understanding, differences between the second embodiment and the first embodiment are described below:
in this embodiment, the lamination method of the battery cell includes the steps of:
s10, the separator 11 is conveyed to the stacking station. Wherein the material at the stacking station is a lamination unit 10, the lamination unit 10 comprising opposing first and second sides 111, 112.
S20, attaching the pole pieces 12 to the first side 111 of the lamination unit 10 by using a handling device to form a new lamination unit 10.
S30, the lamination unit 10 is rotated by 180 ° in a first sense a1 or in a second sense a2 opposite to the first sense a1, to draw the membrane 11 upstream of the stacking station to wrap around the pole piece 12 applied on the first side 111 of the lamination unit 10.
S40, sequentially repeating steps S20 to S30 until the stacked lamination unit 10 includes a plurality of battery cells 101, each battery cell 101 includes a plurality of layers of separators 11 and a plurality of layers of pole pieces 12, and the lamination unit 10 rotates 180 ° along the first rotation direction a1 when the step S30 is performed at the previous time, and the lamination unit 10 rotates 180 ° along the second rotation direction a1 when the step S30 is performed at the next time, and optionally, the pole pieces are replaced by separators 13 when the step S20 is performed at the next time, so that each two adjacent battery cells 103 of the lamination unit 10 have separators 13 therebetween. That is, if the lamination unit 10 is rotated by 180 ° in the first rotation direction a1 while the ith cycle performs step S30, the lamination unit 10 is rotated by 180 ° in the second rotation direction a2 while the (i + 1) th cycle performs step S30. Wherein i is a positive integer.
After the pole pieces 12 are attached to the first side 111 of the lamination unit 10, the diaphragm 11 upstream of the stacking station is drawn to wind around the pole pieces 12 on the first side 111 of the lamination unit 10 (i.e., the diaphragm 11 is stacked on the pole pieces 12 on the first side 111) by rotating the lamination unit 10 by 180 ° in the first rotation direction a1, then the pole pieces 12 are attached to the first side 111 of the lamination unit 10, and then the lamination unit 10 is rotated by 180 ° in the second rotation direction a2, so as to cyclically stack more pole pieces 12 and diaphragms 11 on the first side 111 of the lamination unit 10. When the current battery cells 101 are completely stacked and step S20 is continuously executed in a circulating manner, the pole pieces 12 are replaced by the separators 13, that is, the separators 13 are attached to the first side 111 of the lamination unit 10, and then more battery cells 101 are continuously formed in the same manner, that is, a plurality of battery cells 101 can be continuously formed at one time. After the molding of the plurality of battery cells 101 is completed, the whole lamination unit 10 (including the plurality of battery cells 101) 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 101 together. Because each two adjacent battery cells 101 are separated by the partition plate 13, the separators 11 between the two adjacent battery cells 101 are not adhered together during the hot pressing.
Compared with the prior art, the method for laminating the battery cells can continuously stack and form a plurality of battery cells 101 at one time without stopping the machine, and can send the plurality of battery cells 101 into hot-pressing equipment together for hot pressing, thereby greatly improving the production efficiency and better meeting the production requirement.
It should be noted that, compared with the first embodiment, when step S30 is performed twice in the second embodiment, the rotation directions of the lamination unit 10 are opposite, so that only one side of each partition plate 13 of the lamination unit 10 is wrapped by one layer of the membrane 11, and the other side is not wrapped by the membrane 11, and after the stacking of the battery cells 101 is completed, the membrane 11 on one side of each partition plate 13 is cut off, so that the battery cells 101 can be separated from each other, the waste of the produced membrane 11 is less, which is beneficial to saving the membrane 11 and reducing the production cost.
In an embodiment, if the current battery cells 101 of the lamination unit 10 are completely stacked, the separator 13 is attached to the first side 111 of the lamination unit 10 when step S20 is executed in the 1 st cycle. That is, if the stacking of the current cells 101 of the lamination unit 10 is completed after the jth cycle performs step S20, the separator 13 is attached to the first side 111 of the lamination unit 10 when the jth +1 th cycle performs step S20. Wherein j is a positive integer. In this way, when step S20 is executed next time after the current battery cell 101 of the lamination unit 10 is stacked, the separator 13 is attached to the first side 111 of the lamination unit 10, and then the next battery cell 101 is stacked on the separator 13 in the same manner, so that each battery cell 101 is separated by the separator 13.
In the embodiment, if the positive electrode tab is attached to the first side 111 of the lamination unit 10 when the kth cycle executes step S20, the negative electrode tab is attached to the first side 111 of the lamination unit 10 when the k +1 th cycle executes step S20. Wherein k is a positive integer. Thus, the pole pieces 12 of each cell 101 are arranged in an alternating manner according to the positive pole piece and the negative pole piece, and a diaphragm 11 is arranged between every two adjacent pole pieces 12. It should be noted that, when step S20 is executed, the positive electrode tab or the negative electrode tab may be replaced by the separator 13 as needed, so as to ensure that the separator 13 is disposed at an interval between every two adjacent battery cells 101 in the lamination unit 10.
In an embodiment, after step S40, the method further includes the steps of:
s50, the diaphragm 11 exposed to both sides of the lamination unit 10 in the first direction is cut off using a cutting device. Wherein the direction in which the first side 111 of the lamination unit 10 points towards the second side 112 and the direction of rotation of the lamination unit 10 is perpendicular to the first direction. That is, the diaphragm 11 exposed between the first side 111 and the second side 112 of the lamination unit 10 is cut off using a cutting device.
In an embodiment, after step 40, the method further includes the steps of:
s60, the separator 11 connected to the lamination unit 10 is cut by the cutting device. In this way, after all the battery cells 101 are formed, the separator 11 connected to the lamination unit 10 is cut by the cutting device, that is, the lamination unit 10 is separated from the upstream separator 11, so that the lamination unit 10 is transferred to a hot-pressing device for 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.
In the embodiment shown in fig. 4-1 to 4-11, firstly, the unwinding mechanism unwinds the output diaphragm 11 to the stacking station, so that the leading end of the diaphragm 11 (i.e. the lamination unit 10) is located at the stacking station, and the handling device is used to attach a positive electrode tab to the first side 111 (upper side) of the lamination unit 10. Then, lamination unit 10 is rotated 180 ° in a first rotation direction a1 using the rotating jaws so that separator 11 is wound over the positive electrode sheet on first side 111 of lamination unit 10. Then, the negative electrode tab is attached to the first side 111 (lower side) of the lamination unit 10 by a conveying device. Then, the lamination unit 10 is rotated by 180 ° in the second rotation direction a2 by the rotating jaws, and the positive electrode sheet is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and the negative electrode tab is attached to the first side 111 (lower side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated by 180 ° in the second rotation direction a2 by the rotating jaws, and the positive electrode sheet is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device.
Then, lamination unit 10 is rotated 180 ° in first rotation direction a1 by means of the rotating jaws, and separator 13 is attached to first side 111 (lower side) of lamination unit 10 by means of the handling device. Then, the lamination unit 10 is rotated by 180 ° in the second rotation direction a2 by the rotating jaws, and the positive electrode sheet is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and the negative electrode tab is attached to the first side 111 (lower side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated by 180 ° in the second rotation direction a2 by the rotating jaws, and the positive electrode sheet is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated 180 ° in the first rotation direction a1 by the rotating jaws, and the negative electrode tab is attached to the first side 111 (lower side) of the lamination unit 10 by the handling device. Then, the lamination unit 10 is rotated by 180 ° in the second rotation direction a2 by the rotating jaws, and the positive electrode sheet is attached to the first side 111 (upper side) of the lamination unit 10 by the handling device.
Finally, the diaphragm 11 between the lamination unit 10 and the unwinding mechanism is cut, and the diaphragm 11 exposed to both sides of the lamination unit 10 in the first direction (i.e., the left-right direction) is cut.
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 (10)

1. A method for laminating a battery cell is characterized by comprising the following steps:
a. conveying the diaphragm to a stacking station; wherein the material at the stacking station is a lamination unit comprising opposing first and second sides;
b. attaching pole pieces to the first side or the second side of the lamination unit using a handling device to form a new lamination unit;
c. rotating the lamination unit 180 ° in a first rotation direction to draw a membrane located upstream of the stacking station to wrap around a conforming pole piece overlying the first or second side of the lamination unit;
d. and c, sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cells, each battery cell comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces, the pole pieces are attached to one of the first side and the second side when the step b is executed in the previous circulation, the pole pieces are attached to the other one of the first side and the second side when the step b is executed in the next circulation, and the pole pieces can be selectively replaced by partition plates when the step b is executed in the next circulation, so that a partition plate 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 the step a comprises the following steps:
and unreeling the output diaphragm to the stacking station until the starting end of the diaphragm reaches the stacking station.
3. The cell stacking method of claim 1, wherein, after a first formed cell is stacked and a subsequent cell is formed by continuously stacking the first side and the second side of the stacking unit:
if the current battery core on the first side of the lamination unit is completely stacked, a partition plate is attached to the first side of the lamination unit when the step b is executed in the 2 nd cycle;
if the current battery core stacking on the second side of the lamination unit is completed, a separator is attached to the second side of the lamination unit when the step b is executed in the 2 nd cycle.
4. The method of stacking battery cells of claim 1, wherein in the process of stacking the first battery cell, the handling device sequentially and cyclically attaches the pole pieces with corresponding polarities to the first side or the second side by using a positive pole piece, a negative pole piece, and a positive pole piece as a cyclic unit or a negative pole piece, a positive pole piece, and a negative pole piece as a cyclic unit, so that the pole pieces of the first battery cell are stacked alternately in a positive-negative mode, and a separator is disposed between every two adjacent pole pieces.
5. The method of stacking cells of claim 1, wherein, after a first cell is stacked and continues to stack and form a subsequent cell on the first side and the second side of the lamination unit:
the carrying device sequentially and circularly attaches the pole pieces with the corresponding polarities to the first side 111 or the second side by taking the positive pole piece, the negative pole piece and the positive pole piece as circulating units; or
The carrying device takes a negative pole piece, a positive pole piece and a negative pole piece as circulating units to sequentially and circularly attach the pole pieces with corresponding polarities to the first side or the second side; or
The carrying device takes a negative pole piece, a positive pole piece and a positive pole piece as circulating units to sequentially and circularly attach the pole pieces with corresponding polarities to the first side or the second side; or
The carrying device sequentially and circularly attaches pole pieces with corresponding polarities to the first side or the second side by taking a positive pole piece, a negative pole piece and a negative pole piece as lamination units.
6. The method for laminating the battery cell of claim 1, wherein after the step d, the method further comprises the steps of:
cutting off the diaphragm exposed to both sides of the lamination unit in the first direction; wherein a direction of the first side pointing towards the second side and an axis of rotation of the lamination unit are perpendicular to the first direction.
7. A method for laminating a battery cell is characterized by comprising the following steps:
a. conveying the diaphragm to a stacking station; wherein the material at the stacking station is a lamination unit comprising opposing first and second sides;
b. attaching a pole piece to the first side of the lamination unit by using a handling device to form a new lamination unit;
c. rotating the lamination unit by 180 ° in a first rotation direction or in a second rotation direction opposite to the first rotation direction, to draw a membrane located upstream of the stacking station to wrap around a pole piece fitted over the first side of the lamination unit;
d. and c, sequentially circulating the steps b to c until the stacked lamination unit comprises a plurality of battery cells, each battery cell comprises a plurality of layers of diaphragms and a plurality of layers of pole pieces, the lamination unit rotates 180 degrees along the first rotation direction when the step c is executed at the previous time, the lamination unit rotates 180 degrees along the second rotation direction when the step c is executed at the next time, and optionally, the pole pieces are replaced by partition plates when the step b is executed cyclically, so that a partition plate is arranged between every two adjacent battery cells of the lamination unit.
8. The method of laminating battery cells according to claim 7, wherein if the current cell stack of the lamination unit is completed, a separator is attached to the first side of the lamination unit when step b is performed on the 1 st cycle thereafter.
9. The method for laminating the battery cells according to claim 7, wherein if a positive electrode plate is attached to the first side of the lamination unit when step b is executed in the k-th cycle, a negative electrode plate is attached to the first side of the lamination unit when step b is executed in the (k + 1) -th cycle;
wherein k is a positive integer.
10. The method for laminating the battery cell of claim 7, wherein after the step d, the method further comprises the steps of:
cutting off the diaphragm exposed to both sides of the lamination unit in the first direction; wherein a direction in which the first side points to the second side and a direction of rotation of the lamination unit are perpendicular to the first direction.
CN202111399622.2A 2021-11-24 2021-11-24 Lamination method of battery cell Pending CN114243119A (en)

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Publication number Priority date Publication date Assignee Title
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CN103700888A (en) * 2013-12-19 2014-04-02 深圳市吉阳自动化科技有限公司 Laminator and lamination method thereof
CN204505323U (en) * 2015-02-04 2015-07-29 深圳市吉阳自动化科技有限公司 A kind of shearing device
CN209119243U (en) * 2018-12-10 2019-07-16 韦仕瑜 A kind of stacked wound lithium-ion battery structure
CN210535776U (en) * 2019-10-14 2020-05-15 郑州中科新兴产业技术研究院 Laminated lithium ion battery
CN111446484A (en) * 2020-05-26 2020-07-24 苏州凌威新能源科技有限公司 Battery cell manufacturing method and system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103700889A (en) * 2013-12-19 2014-04-02 深圳市吉阳自动化科技有限公司 Laminator and lamination method thereof
CN103700888A (en) * 2013-12-19 2014-04-02 深圳市吉阳自动化科技有限公司 Laminator and lamination method thereof
CN204505323U (en) * 2015-02-04 2015-07-29 深圳市吉阳自动化科技有限公司 A kind of shearing device
CN209119243U (en) * 2018-12-10 2019-07-16 韦仕瑜 A kind of stacked wound lithium-ion battery structure
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