CN114883659A - Laminated electric core assembly and preparation method thereof - Google Patents
Laminated electric core assembly and preparation method thereof Download PDFInfo
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- CN114883659A CN114883659A CN202210563904.XA CN202210563904A CN114883659A CN 114883659 A CN114883659 A CN 114883659A CN 202210563904 A CN202210563904 A CN 202210563904A CN 114883659 A CN114883659 A CN 114883659A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000003475 lamination Methods 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims description 25
- 238000005452 bending Methods 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000010030 laminating Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 description 17
- 238000012546 transfer Methods 0.000 description 10
- 238000012797 qualification Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a laminated electric core assembly and a preparation method thereof. The lamination electric core assembly comprises at least one electric core structure, and the electric core structure comprises: the positive electrode unit comprises at least two positive electrode plates which are electrically connected; a negative electrode unit including at least two negative electrode tabs electrically connected; the diaphragm is bent and laminated, the diaphragm comprises a plurality of diaphragm sections which are sequentially connected along the thickness direction, and every two adjacent diaphragm sections are arranged at intervals; the at least two positive plates and the at least two negative plates are alternately arranged along the thickness direction, and the positive plates and the negative plates are separated by the diaphragm sections. The technical scheme of the invention solves the problems of low efficiency and low qualified rate of Z-shaped lamination in the prior art.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a laminated electric core assembly and a preparation method of the laminated electric core assembly.
Background
The electric core of the lithium ion battery is composed of a positive plate, a diaphragm and a negative plate, and the electric core is mainly of a laminated structure at present.
The laminated battery core mainly adopts a Z-shaped lamination process: preparing positive and negative pole pieces in advance, making the diaphragm do 'Z' type swing directly or making the lamination table do 'Z' type swing (making the diaphragm do indirect 'Z' type swing), and then placing the positive and negative pole pieces on the diaphragm alternately. The bottleneck of the process is that the mechanical beat of transferring the positive and negative pole pieces is difficult to effectively improve, the lamination precision is difficult to ensure due to excessive lamination times, and the rejection probability of the whole battery cell is increased due to the fact that the phase difference between the positive and negative pole pieces is not consistent.
Therefore, in order to overcome the problems of low yield and low efficiency in the Z-shaped lamination, the invention provides a laminated core assembly, and aims to solve the problems at the same time.
Disclosure of Invention
The invention mainly aims to provide a laminated electric core assembly and a preparation method thereof, and aims to solve the problems of low Z-shaped lamination efficiency and low qualification rate in the prior art.
In order to achieve the above object, the present invention provides a laminated cell assembly including at least one cell structure, the cell structure including: the positive electrode unit comprises at least two positive electrode plates which are electrically connected; a negative electrode unit including at least two negative electrode tabs electrically connected; the diaphragm is bent and laminated, the diaphragm comprises a plurality of diaphragm sections which are sequentially connected along the thickness direction, and every two adjacent diaphragm sections are arranged at intervals; the at least two positive plates and the at least two negative plates are alternately arranged along the thickness direction, and the positive plates and the negative plates are separated by the diaphragm sections.
Further, in the process of continuously bending the diaphragm, the positive electrode unit and the negative electrode unit are bent so that the positive electrode plates and the negative electrode plates are alternately arranged to form an electric core structure, wherein the bending directions of the positive electrode unit and the negative electrode unit form an included angle with the bending direction of the diaphragm.
Further, the laminated cell assembly comprises a plurality of cell structures which are sequentially arranged along the thickness direction, wherein in two adjacent cell structures, on the end faces which are close to each other, the outermost side of one cell structure is a positive plate, the outermost side of the other cell structure is a negative plate, and two diaphragms in the two adjacent cell structures are arranged in a split mode or integrally formed into continuous diaphragms.
Further, the at least two positive plates comprise a first positive plate and a second positive plate, and the at least two negative plates comprise a first negative plate and a second negative plate; the battery cell structure comprises a plurality of positive electrode units and a plurality of negative electrode units which are arranged corresponding to the positive electrode units, a plurality of first positive electrode plates and a plurality of first negative electrode plates are arranged alternately, and a plurality of second positive electrode plates and a plurality of second negative electrode plates are arranged alternately.
Further, the positive electrode unit comprises three positive plates, the negative electrode unit comprises three negative plates, the battery cell structure comprises two diaphragms corresponding to the two positive plates or the two negative plates, and the battery cell structure is formed by continuously folding the diaphragms and bending the positive electrode unit and the negative electrode unit.
Furthermore, the positive electrode unit also comprises a positive electrode lug which is arranged in a bending way, and the two positive electrode sheets are electrically connected through the positive electrode lug; and/or the negative electrode unit further comprises a bent negative electrode lug, and the two negative electrode sheets are electrically connected through the negative electrode lug.
According to another aspect of the present invention, there is provided a method of manufacturing a laminated core assembly, comprising: a first preparation step of electrically connecting the plurality of positive electrode sheets to prepare a positive electrode unit; a second preparation step of electrically connecting the plurality of negative electrode sheets to prepare a negative electrode unit; a lamination step of alternately arranging the positive plates and the negative plates along the thickness direction and continuously folding the diaphragms; and a cutting step of cutting the diaphragm to form a cell structure.
Further, the positive electrode unit includes two positive electrode tabs electrically connected, the negative electrode unit includes two negative electrode tabs electrically connected, and the laminating step includes: the diaphragm is continuously folded to form a plurality of connected diaphragm sections, and the positive plate and the negative plate are separated by the diaphragm sections.
Further, after the step of cutting, the preparation method further comprises the step of stacking a plurality of cell structures, and enabling two diaphragms in two adjacent cell structures to be arranged in a split mode or integrally formed into a continuous diaphragm, so as to form the laminated cell assembly.
Further, the positive electrode unit comprises a first positive electrode plate and a second positive electrode plate which are electrically connected, the negative electrode unit comprises a first negative electrode plate and a second negative electrode plate which are electrically connected, and the laminating step comprises: a stacking step of stacking a plurality of positive electrode units together and a plurality of negative electrode units together; bending the stacked positive electrode unit and the stacked negative electrode unit so that the first positive electrode plate and the second positive electrode plate form an included angle, and the first negative electrode plate and the second negative electrode plate form an included angle; alternately arranging a plurality of first positive electrode plates and a plurality of first negative electrode plates on the folded diaphragm; and alternately arranging the plurality of second positive electrode plates and the plurality of second negative electrode plates on the folded diaphragm.
Further, positive pole unit includes first positive pole piece, second positive pole piece and the third positive pole piece of electricity connection, and negative pole unit includes first negative pole piece, second negative pole piece and the third negative pole piece of electricity connection, and electric core structure is including the first diaphragm and the second diaphragm that set up side by side, and the lamination step includes: placing a second positive pole piece and a third positive pole piece on the first diaphragm and the second diaphragm in sequence; folding the first diaphragm and the second diaphragm by a preset angle; placing a first negative pole piece and a second negative pole piece on the folded first diaphragm and the second diaphragm in sequence; folding the first diaphragm and the second diaphragm by a preset angle; folding the first positive electrode sheet over the first separator; folding the first diaphragm and the first positive pole piece, the first negative pole piece and the second positive pole piece which are arranged on the first diaphragm on the second diaphragm; and folding the third negative pole piece on one side of the first diaphragm or the second diaphragm.
Compared with the traditional Z-shaped lamination, the positive electrode unit of the embodiment comprises at least two connected positive plates, and the negative electrode unit comprises at least two connected negative plates, so that on one hand, compared with the positive and negative plate units which are separately arranged in the prior art, the transfer times of the positive electrode unit and the negative electrode unit can be reduced in the lamination process under the condition of transferring the same number of positive and negative plates, and the lamination efficiency can be improved; on the other hand, the reduction of the transfer times of the positive electrode unit and the negative electrode unit can reduce the risk of the phase difference of the positive electrode unit and the negative electrode unit exceeding the standard, namely, the probability of the deviation of the relative positions of the positive electrode unit and the negative electrode unit can be reduced, thereby improving the qualified rate of lamination. Therefore, the laminated electric core assembly of the embodiment solves the problems of low efficiency and low qualification rate in the Z-shaped lamination.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural view of a positive electrode unit of a laminated core assembly of an embodiment of the present invention;
fig. 2 shows a schematic structural view of a negative electrode unit of the laminated core assembly of the embodiment of the present invention;
fig. 3 is a schematic structural view illustrating a cell structure of a laminated cell assembly according to a first embodiment of the present invention;
FIG. 4 shows a schematic structural view of a laminated core assembly according to a first embodiment of the present invention;
FIG. 5 shows a schematic structural view of a laminated core assembly of a second embodiment of the present invention;
fig. 6 is a schematic structural view showing a stack of a plurality of positive electrode units of a laminated core assembly according to a third embodiment of the present invention;
fig. 7 is a schematic structural view of a laminated core assembly according to a third embodiment of the present invention, in which a plurality of positive electrode units and a plurality of negative electrode units are bent;
fig. 8 is a schematic structural view of a laminated core assembly in a laminating process according to a third embodiment of the present invention;
FIG. 9 is another schematic view of the laminated core assembly of the third embodiment of the present invention during lamination;
fig. 10 is a schematic view showing a laminated core assembly according to a fourth embodiment of the present invention in a lamination process;
fig. 11 is a schematic structural view of a laminated core assembly in a lamination process according to a fifth embodiment of the present invention;
fig. 12 is another schematic structural view of a laminated core assembly in a lamination process according to a fifth embodiment of the present invention;
fig. 13 is a schematic structural view of a laminated core assembly according to a sixth embodiment of the present invention in a lamination process;
FIG. 14 shows a flow diagram of a method of making a laminated electrical core assembly of an embodiment of the present invention; and
fig. 15 shows a flow chart of lamination steps of the laminated core assembly of embodiment three and embodiment four of the present invention.
Wherein the figures include the following reference numerals:
10. a positive electrode unit; 101. a positive plate; 102. a positive tab; 103. a first positive plate; 104. a second positive plate; 105. a first positive electrode sheet; 106. a second positive electrode sheet; 107. a third positive electrode sheet; 20. a negative electrode unit; 201. a negative plate; 202. a negative tab; 203. a first negative plate; 204. a second negative plate; 205. a first negative electrode sheet; 206. a second negative electrode sheet; 207. a third negative electrode plate; 30. a diaphragm; 31. a membrane section; 40. a cell structure; 50. a first diaphragm; 60. a second diaphragm.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that, in the embodiment of the present invention, the predetermined angle is about 180 °
The invention provides a laminated cell assembly, which is characterized in that a single pole piece unit is divided into a plurality of connected pole pieces, and then a plurality of times of lamination (such as Z-shaped folding) of a diaphragm are matched to obtain a cell structure, and the cell structure can be directly stacked to obtain the laminated cell assembly with the required number of layers.
As shown in fig. 1, 2, 4, 5, 9, 12 and 13, an embodiment of the present invention provides a laminated electrical core assembly. The laminated cell assembly includes at least one cell structure 40, and the cell structure 40 includes a positive electrode unit 10, a negative electrode unit 20, and a continuously folded separator 30. The positive electrode unit 10 includes at least two positive electrode sheets 101 electrically connected to each other; the negative electrode unit 20 includes at least two negative electrode tabs 201 electrically connected; the diaphragm 30 is bent for lamination, the diaphragm 30 comprises a plurality of diaphragm sections 31 which are sequentially connected along the thickness direction, and every two adjacent diaphragm sections 31 are arranged at intervals; wherein, at least two positive plates 101 and at least two negative plates 201 are arranged alternately along the thickness direction, and the positive plates 101 and the negative plates are separated by the membrane section 31.
In the foregoing technical solution, compared with the conventional Z-shaped lamination, the positive electrode unit 10 of this embodiment includes at least two connected positive electrode plates 101, and the negative electrode unit 20 includes at least two connected negative electrode plates 201, on one hand, compared with a positive electrode plate unit and a negative electrode plate unit separately arranged in the prior art, in the case of transferring the same number of positive electrode plates and negative electrode plates, the transfer times of the positive electrode unit 10 and the negative electrode unit 20 can be reduced in the lamination process, so that the lamination efficiency can be improved; on the other hand, the reduction of the number of transitions of the positive electrode unit 10 and the negative electrode unit 20 can reduce the risk of the phase difference of the positive electrode unit 10 and the negative electrode unit 20 exceeding the specification, that is, the probability of the relative position deviation of the positive electrode unit 10 and the negative electrode unit 20 can be reduced, thereby improving the lamination yield. Therefore, the laminated electric core assembly of the embodiment solves the problems of low efficiency and low qualification rate in the Z-shaped lamination.
Further, the battery cell structure 40 is obtained by folding the positive plate 101 and the negative plate 201, and then the battery cell structure 40 is stacked in any number, so that the laminated battery cell assembly can be obtained, and the laminating efficiency can be effectively improved.
As shown in fig. 1, fig. 2, fig. 4, fig. 5, fig. 9, fig. 12, and fig. 13, in the process of continuously bending the separator 30, the positive electrode unit 10 and the negative electrode unit 20 are bent so that the positive electrode sheets 101 and the negative electrode sheets 201 are alternately arranged to form the cell structure 40, wherein the bending directions of the positive electrode unit 10 and the negative electrode unit 20 form an included angle with the bending direction of the separator 30.
In the above technical solution, by arranging the bent positive electrode unit 10 and the bent negative electrode unit 20, one positive electrode unit 10 can form two positive electrode plates, and one negative electrode unit 20 can form two negative electrode plates, so that compared with the positive electrode plate unit and the negative electrode plate unit which are separately arranged in the prior art, the transfer times of the positive electrode unit 10 and the negative electrode unit 20 can be reduced in the lamination process in the case of transferring the same number of positive and negative electrode plates, thereby improving the lamination efficiency.
Specifically, the bending direction of the positive electrode cell 10 and the negative electrode cell 20 forms an angle with the bending direction of the separator 30. Thus, the bending of the positive and negative electrode units and the bending of the diaphragm can not interfere with each other. Preferably, the bending angle of the separator 30 is 90 °, the bending angle of the positive electrode unit 10 is 90 °, and the bending angle of the negative electrode unit 20 is 90 °.
Example one
As shown in fig. 3 and 4, in the embodiment of the present invention, the laminated cell assembly includes a plurality of cell structures 40 sequentially arranged in the thickness direction, on the end surfaces of two adjacent cell structures 40, the outermost side of one cell structure 40 is the positive electrode tab 101, the outermost side of the other cell structure 40 is the negative electrode tab 201, and two separators 30 in two adjacent cell structures 40 are separately arranged.
Among the above-mentioned technical scheme, through piling up a plurality of electric core structure 40, just can obtain lamination electric core subassembly to can effectively promote lamination efficiency.
Specifically, in the first embodiment of the present invention, the cell structure 40 includes a positive electrode unit 10 and a negative electrode unit 20.
It should be noted that the number of stacked cell structures 40 is not limited in the present invention.
As shown in fig. 1, in the embodiment of the present invention, the positive electrode unit 10 further includes a positive electrode tab 102 disposed in a bent manner, and the two positive electrode tabs 101 are electrically connected through the positive electrode tab 102. Thus, not only can the electrical connection between the two positive plates 101 be realized, but also the active material on the positive plates 101 can be prevented from falling under the condition that the positive electrode unit 10 is bent, so that the qualification rate of the laminated cell assembly is prevented from being influenced.
As shown in fig. 2, in the embodiment of the present invention, the negative electrode unit 20 further includes a bent negative electrode tab 202, and the two negative electrode tabs 201 are electrically connected through the negative electrode tab 202. In this way, not only can the electrical connection between two negative plates 201 be realized, but also under the condition that negative electrode unit 20 is bent, the active material on negative plates 201 can be prevented from dropping, so as to avoid influencing the qualification rate of the laminated cell assembly.
Specifically, in the first embodiment of the present invention, the positive electrode unit 10 includes two positive electrode tabs 101, and the negative electrode unit 20 includes two negative electrode tabs 201. This can reduce the number of transfers of the positive electrode unit 10 and the negative electrode unit 20 during the lamination process, so that the lamination efficiency can be improved.
Specifically, in the first embodiment of the present invention, the positive electrode tab 101 is made of aluminum foil, and is formed by coating a positive electrode active material on the upper surface and the lower surface thereof, respectively, and then drying and rolling the coated positive electrode active material, and the positive electrode tab 102 is made of aluminum foil without coating a positive electrode active material thereon.
Specifically, in the first embodiment of the present invention, the negative electrode sheet 201 is made of copper foil, and is formed by coating a negative electrode active material on the upper and lower surfaces thereof, respectively, and then drying and rolling the coated negative electrode sheet, and the negative electrode tab 202 is made of copper foil without coating a negative electrode active material thereon.
Example two
As shown in fig. 5, the laminated core assembly of the second embodiment of the present invention is different from the first embodiment in that the diaphragm 30 is integrally formed to form a continuous diaphragm. In this way, by providing a continuous folded separator 30 and folding a plurality of positive electrode units 10 and a plurality of negative electrode units 20 on each separator segment 31 in the continuous separator, a cell structure 40 having a plurality of positive electrode units 10 and a plurality of negative electrode units 20 can be formed to form a laminated cell assembly, so that a subsequent step of stacking a plurality of cell structures 40 can be omitted, thereby simplifying the manufacturing process and improving the manufacturing efficiency.
It should be noted that the laminated electric core assembly in the second embodiment includes one electric core structure 40, and one electric core structure 40 includes a plurality of positive electrode units 10 and a plurality of negative electrode units 20.
The number of stacked positive electrode sheets 101 and negative electrode sheets 201 in the cell structure 40 is not limited in the present invention.
The other structures of the second embodiment are the same as those of the first embodiment, and are not described herein again.
EXAMPLE III
As shown in fig. 6 to 9, in the third embodiment of the present invention, the at least two positive electrode tabs 101 include a first positive electrode tab 103 and a second positive electrode tab 104, and the at least two negative electrode tabs 201 include a first negative electrode tab 203 and a second negative electrode tab 204; the battery cell structure 40 includes a plurality of positive electrode units 10 and a plurality of negative electrode units 20 arranged corresponding to the plurality of positive electrode units 10, wherein the plurality of first positive electrode tabs 103 and the plurality of first negative electrode tabs 203 are alternately arranged, and the plurality of second positive electrode tabs 104 and the plurality of second negative electrode tabs 204 are alternately arranged.
In the above technical solution, compared with the conventional Z-shaped laminated sheet in which the positive electrode units 10 and the negative electrode units 20 are alternately arranged, the third embodiment may first alternately arrange the plurality of first positive electrode tabs 103 and the plurality of first negative electrode tabs 203, then alternately arrange the plurality of second positive electrode tabs 104 and the plurality of second negative electrode tabs 204, or, the plurality of second positive electrode plates 104 and the plurality of second negative electrode plates 204 are alternately arranged, then, the plurality of first positive electrode tabs 103 are alternately arranged with the plurality of first negative electrode tabs 203, and thus, the positive electrode unit 10 and the negative electrode unit 20 may be stacked together, respectively, and the positive electrode unit 10 and the negative electrode unit 20 may be fixed and formed in an L-shape, and then the plurality of positive plates 101 and the plurality of negative plates 201 are alternately arranged, so that the stacking precision of each positive plate 101 and each negative plate 201 can be improved, the stacking precision is improved, and the stacking qualified rate is further improved.
Specifically, as shown in fig. 9, in the third embodiment of the present invention, the first positive electrode tab 103 and the first negative electrode tab 203 are both located below the second positive electrode tab 104 and the second negative electrode tab 204.
Example four
As shown in fig. 10, the laminated core assembly of example four of the present invention is different from example three in that the first positive electrode tab 103 and the first negative electrode tab 203 are both positioned above the second positive electrode tab 104 and the second negative electrode tab 204.
The other structures of the fourth embodiment are the same as those of the third embodiment, and are not described herein again.
EXAMPLE five
As shown in fig. 11 and 12, in a fifth embodiment of the present invention, the positive electrode unit 10 includes three positive electrode sheets 101, the negative electrode unit 20 includes three negative electrode sheets 201, the cell structure 40 includes two separators 30 corresponding to the two positive electrode sheets 101 or the two negative electrode sheets 201, and the cell structure 40 is formed by continuously folding the separators 30 and bending the positive electrode unit 10 and the negative electrode unit 20.
In the above technical solution, the positive electrode unit 10 includes three positive electrode plates 101, and the negative electrode unit 20 includes three negative electrode plates 201, so that the transfer times of the positive electrode unit 10 and the negative electrode unit 20 can be further reduced, the lamination times are greatly reduced, and the lamination efficiency is further improved.
Specifically, in the fifth embodiment, a plurality of cell structures 40 are stacked to form a laminated cell assembly.
Specifically, in the fifth embodiment, one negative electrode tab 201 of the three negative electrode tabs 201 is located above the three positive electrode tabs 101.
EXAMPLE six
As shown in fig. 13, the laminated core assembly of example six of the present invention is different from example five in that one negative electrode sheet 201 of the three negative electrode sheets 201 is positioned below the three positive electrode sheets 101.
The other structures of the sixth embodiment are the same as those of the fifth embodiment, and are not described herein again.
As shown in fig. 14, an embodiment of the present invention provides a method of manufacturing a laminated core assembly. The preparation method of the laminated electric core assembly comprises the following steps: a first preparation step of electrically connecting the plurality of positive electrode sheets 101 to prepare the positive electrode unit 10; a second preparation step of electrically connecting the plurality of negative electrode tabs 201 to prepare a negative electrode unit 20; a lamination step of alternately arranging the positive electrode sheets 101 and the negative electrode sheets 201 in the thickness direction and continuously folding the separators 30; a step of cutting the separator 30 to form a cell structure 40.
In the foregoing technical solution, compared with the conventional Z-type lamination method, in this embodiment, the positive electrode unit 10 is prepared by electrically connecting the plurality of positive electrode sheets 101, and the negative electrode unit 20 is prepared by electrically connecting the plurality of negative electrode sheets 201, so that, on one hand, the transfer times of the positive electrode unit 10 and the negative electrode unit 20 can be reduced in the lamination process, thereby improving the lamination efficiency; on the other hand, the reduction of the number of transitions of the positive electrode unit 10 and the negative electrode unit 20 can reduce the risk of the phase difference of the positive electrode unit 10 and the negative electrode unit 20 exceeding the specification, that is, the probability of the relative position deviation of the positive electrode unit 10 and the negative electrode unit 20 can be reduced, thereby improving the lamination yield. Therefore, the laminated electric core assembly of the embodiment solves the problems of low efficiency and low qualification rate in the Z-shaped lamination.
In the embodiment of the present invention, the positive electrode unit 10 includes two positive electrode tabs 101 electrically connected, the negative electrode unit 20 includes two negative electrode tabs 201 electrically connected, and the laminating step includes: the separator 30 is continuously folded to form a plurality of connected separator segments 31, and the positive electrode tab 101 and the negative electrode tab 201 are separated by the separator segments 31.
In the above technical solution, on one hand, the cell structure 40 may be formed; on the other hand, in the lamination process, the number of times of transferring the positive electrode unit 10 and the negative electrode unit 20 may be reduced, so that the lamination efficiency may be improved.
Preferably, in this embodiment of the present invention, the diaphragm 30 is folded continuously in a Z-shape.
Preferably, in the method of manufacturing the laminated electric core assembly of the first embodiment, the laminating step includes: firstly, taking a positive electrode unit 10, and placing one 101 of two positive electrode sheets 101 on a diaphragm 30; second, the diaphragm 30 is folded by a preset angle; thirdly, taking a negative electrode unit 20, and placing one 201 of the two negative electrode sheets 201 on the folded diaphragm 30; fourth, the diaphragm 30 is folded by a preset angle; fifth, the other positive electrode tab 101 of the two positive electrode tabs 101 is folded over the separator 30; sixth, the diaphragm 30 is folded by a preset angle; seventh, the other negative electrode sheet 201 of the two negative electrode sheets 201 is folded on the separator 30. This may form the cell structure 40.
It should be noted that, in the first embodiment of the present invention, the predetermined angle is about 180 °.
As shown in fig. 14, in the method of the first embodiment, after the step of cutting, the method further includes stacking a plurality of cell structures 40, and arranging two separators 30 in two adjacent cell structures 40 separately. In this way, a plurality of cell structures 40 may be stacked into a laminated cell assembly having a plurality of positive electrode units 10 and a plurality of negative electrode units 20, so that the lamination efficiency may be effectively improved.
Preferably, in the second embodiment, the positive electrode unit 10 includes two positive electrode tabs 101 electrically connected, and the negative electrode unit 20 includes two negative electrode tabs 201 electrically connected, and in the method of manufacturing the laminated core assembly of the second embodiment, the laminating step includes: firstly, taking a positive electrode unit 10, and placing one 101 of two positive electrode sheets 101 on a diaphragm 30; second, the diaphragm 30 is folded by a preset angle; thirdly, taking a negative electrode unit 20, and placing one 201 of the two negative electrode sheets 201 on the folded diaphragm 30; fourth, the diaphragm 30 is folded by a preset angle; fifth, the other positive electrode sheet 101 is folded on the separator 30; sixth, the diaphragm 30 is folded by a preset angle; seventh, the other negative electrode sheet 201 is folded on the separator 30; eighth, the diaphragm 30 is folded by a predetermined angle; ninthly, taking the other positive electrode unit 10, and placing one 101 of the two positive electrode sheets 101 on the diaphragm 30; tenth, the diaphragm 30 is folded by a preset angle; eleventh, taking another negative electrode unit 20, and placing one 201 of the two negative electrode sheets 201 on the folded separator 30; and twelfth, repeating the steps until the cell structure 40 with the required stacking layers is obtained. Thus, the laminated cell assembly can have a plurality of positive electrode units 10 and a plurality of negative electrode units 20 with one integrally formed continuous diaphragm, so that the subsequent step of stacking a plurality of cell structures 40 can be omitted, the processing process can be simplified, and the processing efficiency can be improved.
As shown in fig. 6 to 9 and 15, in the embodiment of the present invention in which the positive electrode unit 10 includes the first positive electrode tab 103 and the second positive electrode tab 104 that are electrically connected and the negative electrode unit 20 includes the first negative electrode tab 203 and the second negative electrode tab 204 that are electrically connected, in the method of manufacturing the laminated core assembly of the third and fourth embodiments, the laminating step includes: a stacking step of stacking a plurality of positive electrode units 10 together and a plurality of negative electrode units 20 together; bending the stacked positive electrode unit 10 and negative electrode unit 20 to make the first positive electrode plate 103 and the second positive electrode plate 104 form an included angle, and the first negative electrode plate 203 and the second negative electrode plate 204 form an included angle; disposing the plurality of first positive electrode tabs 103 and the plurality of first negative electrode tabs 203 alternately on the folded separator 30; the plurality of second positive electrode tabs 104 and the plurality of second negative electrode tabs 204 are alternately disposed on the folded separator 30.
In the above technical solution, compared with the conventional Z-type lamination method in which the positive electrode units 10 and the negative electrode units 20 are alternately arranged, in the method for manufacturing the laminated electrode assemblies according to the third and fourth embodiments, the positive electrode units 10 and the negative electrode units 20 are stacked together, fixed and bent, and then the positive electrode units 10 and the negative electrode units 20 are alternately arranged, so that the lamination precision can be improved, and the lamination yield can be improved.
Specifically, as shown in fig. 7, the first positive electrode tab 103 and the second positive electrode tab 104 are disposed at an angle, and the first negative electrode tab 203 and the second negative electrode tab 204 are disposed at an angle, which means that the stacked positive electrode unit 10 and negative electrode unit 20 are respectively bent into an L shape.
Specifically, as shown in fig. 7 and 8, the disposing the plurality of first positive electrode tabs 103 and the plurality of first negative electrode tabs 203 alternately on the folded separator 30 specifically includes: the separator 30 is first placed between the bent positive electrode unit 10 and the negative electrode unit 20, the first positive electrode sheet 103 is then placed on the separator 30, the separator 30 is then folded in a plane perpendicular to the plane of fig. 7, and the first negative electrode sheet 203 is then placed on the folded separator 30.
Specifically, as shown in fig. 9, on the basis of fig. 8, the second positive electrode tab 104 and the second negative electrode tab 204 are respectively folded upward until the cell structure 40 is obtained, so that the cell structure 40 of the third example can be prepared.
Specifically, as shown in fig. 10, on the basis of fig. 8, the second positive electrode tab 104 and the second negative electrode tab 204 are respectively folded downward until the cell structure 40 is obtained, so that the cell structure 40 of the fourth example can be prepared.
Of course, in an alternative embodiment not shown in the drawings, in addition to fig. 8, a part of the second positive electrode tabs 104 and the second negative electrode tabs 204 may be folded upward, and another part of the second positive electrode tabs 104 and another part of the second negative electrode tabs 204 may be folded downward, as long as the second positive electrode tabs 104 and the second negative electrode tabs 204 are alternately arranged on both sides of the separator 30.
With respect to the third and fourth preferred embodiments, the present invention does not limit the number of stacked layers of the positive electrode unit 10 and the negative electrode unit 20 in the initial state (fig. 6).
As shown in fig. 11 to 13, in fifth and sixth embodiments of the present invention, the positive electrode unit 10 includes a first positive electrode tab 105, a second positive electrode tab 106, and a third positive electrode tab 107 that are electrically connected, the negative electrode unit 20 includes a first negative electrode tab 205, a second negative electrode tab 206, and a third negative electrode tab 207 that are electrically connected, the cell structure 40 includes a first separator 50 and a second separator 60 that are arranged in parallel, and in the method for preparing the laminated cell assemblies of the fifth and sixth embodiments, the laminating step includes: placing a second positive pole piece 106 and a third positive pole piece 107 in sequence on the first diaphragm 50 and the second diaphragm 60; folding the first and second diaphragms 50 and 60 by a preset angle; placing a first negative electrode piece 205 and a second negative electrode piece 206 on the folded first diaphragm 50 and the second diaphragm 60 in sequence; folding the first and second diaphragms 50 and 60 by a preset angle; folding the first positive pole piece 105 over the first separator 50; folding the first separator 50 and the first positive pole piece 105, the first negative pole piece 205 and the second positive pole piece 106 disposed thereon over the folded second separator 60; the third negative electrode tab 207 is folded on one side of the first separator 50 or the second separator 60.
In the above technical solution, the positive electrode unit 10 and the negative electrode unit 20 both include three positive and negative electrode plates (the first positive electrode plate 105, the second positive electrode plate 106, the third positive electrode plate 107, the first negative electrode plate 205, the second negative electrode plate 206, and the third negative electrode plate 207), so that the transfer frequency of the positive electrode unit 10 and the negative electrode unit 20 can be further reduced, which greatly reduces the lamination frequency and further improves the lamination efficiency.
Specifically, as shown in fig. 11, folding the first separator 50 and the first positive electrode tab 105, the first negative electrode tab 205, and the second positive electrode tab 106 disposed thereon over the folded second separator 60 means that the first separator 50 and the first positive electrode tab 105, the first negative electrode tab 205, and the second positive electrode tab 106 disposed thereon are rotated clockwise by 180 degrees and then attached to the second separator 60.
Preferably, as shown in fig. 12, the third negative electrode tab 207 is folded upward, that is, the third negative electrode tab 207 is folded on the first separator 50, so that the cell structure 40 of the fifth embodiment can be prepared.
Preferably, as shown in fig. 13, the third negative electrode tab 207 is folded downward, that is, the third negative electrode tab 207 is folded on the second separator 60, so that the cell structure 40 of example six can be prepared.
Specifically, a plurality of cell structures 40 in the fifth and sixth embodiments are stacked on each other, so that a laminated cell assembly can be obtained. And the present invention does not limit the number of stacked cell structures 40 in a laminated cell assembly.
It should be noted that, various derivation schemes can be obtained in the present invention, for example, the positive electrode unit 10 includes a plurality (> 3) of positive electrode sheets, the negative electrode unit 20 includes a plurality (> 3) of negative electrode sheets, and the laminated cell assembly can be formed by stacking a plurality of cell structures 40, and the cell structures 40 can be different in structure, so that the adaptability of engineering manufacturing can be greatly improved.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: compared with the traditional Z-shaped lamination, the positive electrode unit of the embodiment comprises at least two connected positive electrode plates, and the negative electrode unit comprises at least two connected negative electrode plates, so that compared with the positive electrode plate unit and the negative electrode plate unit which are separately arranged in the prior art, the transfer times of the positive electrode unit and the negative electrode unit can be reduced in the lamination process under the condition of transferring the same number of positive electrode plates and negative electrode plates, and the lamination efficiency can be improved; on the other hand, the reduction of the transfer times of the positive electrode unit and the negative electrode unit can reduce the risk of the phase difference of the positive electrode unit and the negative electrode unit exceeding the standard, namely, the probability of the deviation of the relative positions of the positive electrode unit and the negative electrode unit can be reduced, thereby improving the qualified rate of lamination. Therefore, the laminated electric core assembly of the embodiment solves the problems of low efficiency and low qualification rate in the Z-shaped lamination.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A laminated cell assembly, comprising at least one cell structure (40), the cell structure (40) comprising:
a positive electrode unit (10) comprising at least two positive electrode tabs (101) electrically connected;
a negative electrode unit (20) comprising at least two negative electrode tabs (201) electrically connected;
the diaphragm (30) is bent and laminated, the diaphragm (30) comprises a plurality of diaphragm sections (31) which are sequentially connected along the thickness direction, and every two adjacent diaphragm sections (31) are arranged at intervals;
the at least two positive electrode sheets (101) and the at least two negative electrode sheets (201) are alternately arranged along the thickness direction, and the positive electrode sheets (101) and the negative electrode sheets (201) are separated by the membrane sections (31).
2. The laminated cell assembly of claim 1, wherein the positive electrode units (10) and the negative electrode units (20) are bent during continuous bending of the separator (30) such that the positive electrode sheets (101) and the negative electrode sheets (201) are alternately arranged to form the cell structure (40), wherein the bending directions of the positive electrode units (10) and the negative electrode units (20) are at an angle to the bending direction of the separator (30).
3. The laminated cell assembly of claim 1, wherein the laminated cell assembly comprises a plurality of cell structures (40) sequentially arranged in the thickness direction, the outermost side of one cell structure (40) is a positive plate (101), the outermost side of the other cell structure (40) is a negative plate (201), and two diaphragms (30) in two adjacent cell structures (40) are separately arranged or integrally formed into a continuous diaphragm, on the adjacent end surfaces of the two adjacent cell structures (40).
4. The laminated core assembly according to claim 1, wherein at least two of said positive plates (101) comprise a first positive plate (103) and a second positive plate (104), and at least two of said negative plates (201) comprise a first negative plate (203) and a second negative plate (204);
the battery cell structure (40) comprises a plurality of positive electrode units (10) and a plurality of negative electrode units (20) which are arranged corresponding to the positive electrode units (10), a plurality of first positive electrode plates (103) and a plurality of first negative electrode plates (203) are alternately arranged, and a plurality of second positive electrode plates (104) and a plurality of second negative electrode plates (204) are alternately arranged.
5. The laminated core assembly of claim 1, wherein said positive electrode unit (10) comprises three positive electrode sheets (101), said negative electrode unit (20) comprises three negative electrode sheets (201), said cell structure (40) comprises two said separators (30) corresponding to two said positive electrode sheets (101) or two said negative electrode sheets (201), and said cell structure (40) is formed by continuously folding said separators (30) and bending said positive electrode unit (10) and said negative electrode unit (20).
6. The laminated core assembly according to any one of claims 1 to 5, wherein said positive electrode unit (10) further comprises positive electrode tabs (102) arranged in a bent manner, two of said positive electrode sheets (101) being electrically connected through said positive electrode tabs (102); and/or the presence of a gas in the gas,
the negative electrode unit (20) further comprises bent negative electrode tabs (202), and the two negative electrode sheets (201) are electrically connected through the negative electrode tabs (202).
7. A method of making a laminated electrical core assembly, comprising:
a first preparation step of electrically connecting a plurality of positive electrode sheets (101) to prepare a positive electrode unit (10);
a second preparation step of electrically connecting the plurality of negative electrode sheets (201) to prepare a negative electrode unit (20);
a lamination step of alternately arranging the positive electrode sheets (101) and the negative electrode sheets (201) in the thickness direction and continuously folding the separators (30);
a step of cutting the separator (30) to form a cell structure (40).
8. The method for preparing a laminated core assembly according to claim 7, wherein said positive electrode unit (10) comprises two positive electrode sheets (101) electrically connected, said negative electrode unit (20) comprises two negative electrode sheets (201) electrically connected, said laminating step comprising:
continuously folding the separator (30) to form a plurality of connected separator segments (31), and separating the positive electrode sheet (101) and the negative electrode sheet (201) by the separator segments (31).
9. The method of manufacturing a laminated core assembly according to claim 8, wherein after the step of cutting, the method further comprises stacking a plurality of the cell structures (40) and arranging two of the separators (30) of two adjacent cell structures (40) separately or integrally as a continuous separator to form the laminated core assembly.
10. The method of manufacturing a laminated core assembly according to claim 7, wherein the positive electrode unit (10) comprises a first positive electrode tab (103) and a second positive electrode tab (104) which are electrically connected, the negative electrode unit (20) comprises a first negative electrode tab (203) and a second negative electrode tab (204) which are electrically connected, the laminating step comprises:
a stacking step of stacking a plurality of the positive electrode units (10) and a plurality of the negative electrode units (20);
bending the stacked positive electrode unit (10) and the stacked negative electrode unit (20) so that the first positive electrode sheet (103) and the second positive electrode sheet (104) form an included angle, and the first negative electrode sheet (203) and the second negative electrode sheet (204) form an included angle;
alternately disposing a plurality of the first positive electrode tabs (103) and a plurality of the first negative electrode tabs (203) on the folded separator (30);
and alternately arranging a plurality of second positive electrode sheets (104) and a plurality of second negative electrode sheets (204) on the folded separator (30).
11. The method of manufacturing the laminated core assembly of claim 8, wherein the positive electrode unit (10) comprises a first positive electrode sheet (105), a second positive electrode sheet (106) and a third positive electrode sheet (107) which are electrically connected, the negative electrode unit (20) comprises a first negative electrode sheet (205), a second negative electrode sheet (206) and a third negative electrode sheet (207) which are electrically connected, the cell structure (40) comprises a first separator (50) and a second separator (60) which are arranged side by side, and the laminating step comprises:
-placing the second positive pole piece (106) and the third positive pole piece (107) in sequence on the first separator (50) and the second separator (60);
folding the first and second diaphragms (50, 60) by a preset angle;
placing the first negative electrode tab (205) and the second negative electrode tab (206) in sequence on the folded first separator (50) and the second separator (60);
folding the first and second diaphragms (50, 60) by a preset angle;
folding the first positive pole piece (105) over the first separator (50);
folding the first separator (50) and the first positive pole piece (105), the first negative pole piece (205) and the second positive pole piece (106) disposed thereon over the second separator (60);
folding the third negative electrode tab (207) on one side of the first separator (50) or the second separator (60).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210563904.XA CN114883659A (en) | 2022-05-23 | 2022-05-23 | Laminated electric core assembly and preparation method thereof |
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| CN202210563904.XA CN114883659A (en) | 2022-05-23 | 2022-05-23 | Laminated electric core assembly and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117673429A (en) * | 2022-09-08 | 2024-03-08 | 荣耀终端有限公司 | Battery cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117673429A (en) * | 2022-09-08 | 2024-03-08 | 荣耀终端有限公司 | Battery cell |
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