CN110931885A - Preparation method of battery core of thin lithium ion battery, and battery core and battery applying same - Google Patents
Preparation method of battery core of thin lithium ion battery, and battery core and battery applying same Download PDFInfo
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- CN110931885A CN110931885A CN201911219237.8A CN201911219237A CN110931885A CN 110931885 A CN110931885 A CN 110931885A CN 201911219237 A CN201911219237 A CN 201911219237A CN 110931885 A CN110931885 A CN 110931885A
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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
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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
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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
- 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
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- 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
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- 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
Abstract
The invention belongs to the technical field of electronic products, in particular to a method for preparing a battery cell of a thin lithium ion battery, and the battery cell and the battery using the same, which comprise the following steps: placing the diaphragm on the first pole piece, and enabling the diaphragm to cover one surface, coated with the active matter, of the first pole piece; placing a second pole piece on the membrane; folding the diaphragm in half so that the diaphragm is coated on two opposite sides of the second pole piece; folding the first pole piece in half so that the first pole piece is wrapped on the two opposite sides of the diaphragm to form a first folding body; the first folding body is folded for multiple times according to actual requirements to reduce the size of the battery core, so that the battery is suitable for preparing a battery which does not have requirements on the thickness size but has certain requirements on the length and the width size to improve the adaptive capacity of the battery core and improve the utilization rate of the internal space of the battery.
Description
Technical Field
The invention belongs to the technical field of electronic products, and particularly relates to a method for preparing a battery cell of a thin lithium ion battery, and the battery cell and the battery using the battery cell.
Background
With the development of the internet of things industry, the demand of the market for thin batteries is increasing, wherein thin lithium ion batteries are widely applied to various electronic devices because of their advantages of small size, easy adaptation to various electronic products, and the like. However, the conventional soft-package lithium ion battery cell is usually prepared by winding or multi-layer lamination, but the battery cell prepared by the above method has a defect of low space utilization rate, which is mainly reflected in that the redundant useless diaphragm layer or empty foil material occupies the space inside the battery, so that it is necessary to provide a method for preparing a battery cell which effectively reduces the volume of the battery cell.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing a thin lithium ion battery cell capable of reducing the cell volume.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for preparing a battery core of a thin lithium ion battery comprises a packaging layer and a battery core body, wherein the battery core body comprises a diaphragm, a first pole piece and a second pole piece, one side surface of the first pole piece is coated with an active matter, the other side surface of the first pole piece is a hollow foil surface, the upper edge of the first pole piece is provided with a first terminal, and the first terminal is connected with a first tab; active matters are coated on two opposite sides of the second pole piece, a second terminal is arranged on the upper edge of the second pole piece, and a second tab is connected to the second terminal; the battery cell preparation method comprises the following steps of forming the battery cell body:
(1) and placing the diaphragm on the first pole piece, so that the diaphragm covers one side of the first pole piece coated with the active matter.
(2) A second pole piece is placed on the separator.
(3) And folding the diaphragm in half so that the diaphragm is coated on two opposite sides of the second pole piece.
(4) And folding the first pole piece in half so that the first pole piece is wrapped on the two opposite sides of the diaphragm to form a first folding body.
(5) The first fold is folded in half to form a second fold.
Compared with the prior art, the first folding body formed by the cell preparation method utilizes the form of folding the first pole piece to coat the second pole piece, so that the capacity of the battery is improved by increasing the thickness of the cell on the premise of not changing the length and the width of the cell. In addition, the method can fold the formed first folding body for multiple times according to actual requirements so as to reduce the length or width dimension of the battery cell, thereby being suitable for preparing the battery which does not have the requirement on the thickness dimension but has certain requirements on the length and width dimension so as to improve the adaptation capability of the battery cell and improve the utilization rate of the internal space of the battery.
The direction from the upper edge of the first pole piece to the lower edge of the first pole piece is defined as the length direction, and one side perpendicular to the length direction is defined as the width direction.
Preferably, when the first folded body is folded in half along the longitudinal direction of the first pole piece in step (5), the upper edge and the lower edge of the first folded body are aligned, or the lower edge of the first folded body and the upper edges of the first terminal and the second terminal are aligned; or when the first folding body is folded in half along the width direction of the first pole piece, one side edge and the opposite side edge of the first folding body are aligned.
Preferably, when steps (3) and (4) are carried out; folding the first pole piece and the diaphragm in half along the length direction of the first pole piece; or the first pole piece and the diaphragm are folded in half along the width direction of the first pole piece.
Preferably, the arrangement mode of the second pole piece includes the following two types:
the first arrangement mode of the second pole piece is that the two opposite side surfaces of the second pole piece are coated with active matters, and the arrangement mode can reduce the thickness of the battery cell.
The second pole piece is formed by folding pole pieces with one side coated with an active matter and the other side coated with an empty foil surface, the empty foil surface of the folded pole piece faces inwards, and the side coated with the active matter faces outwards.
Preferably, the method further comprises the step (6): and folding the second folded body in half to form a third folded body, so that the volume of the battery cell can be further reduced. Wherein, when step (6) is performed; when the second folded body is folded along the width direction of the first pole piece, one side edge and the opposite side edge of the second folded body are aligned; alternatively, when the second folded body is folded in half along the length direction of the first pole piece, the upper edge and the lower edge of the second folded body may be aligned.
Preferably, the method further comprises the following steps: connecting a first pole piece and the packaging layer before the step (1) is carried out, so that the empty foil surface of the first pole piece faces the packaging layer, connecting a diaphragm and the packaging layer when the step (1) is carried out, and connecting a second pole piece and the packaging layer when the step (2) is carried out. Above mode can all fix pole piece and diaphragm on the packaging layer when preparing the electric core body, and pole piece and diaphragm's location when being favorable to preparing the electric core body on the one hand, on the other hand can make things convenient for follow-up packing operation to the electric core body. Wherein the layer is pasted on accessible double-sided the realization first pole piece, diaphragm, second pole piece and packaging layer's connection respectively, a side of double-sided adhesive linkage is connected the packaging layer, first terminal, second terminal and diaphragm are connected respectively to another side. As a specific embodiment, in the step (3), the separator is folded in half along the longitudinal direction of the first pole piece, so that the lower edge of the separator is adhered to the double-sided adhesive layer.
The invention also provides a battery cell manufactured by applying the battery cell manufacturing method, which comprises a packaging layer and a battery cell body, wherein the packaging layer is coated on the outer side of the battery cell body, the battery cell body is formed by folding a folding body at least once, the folding body comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece is folded to form a U-shaped accommodating cavity, the inner side surface of the U-shaped accommodating cavity is coated with an active substance, the second pole piece is arranged in the U-shaped accommodating cavity, and the diaphragm is folded and coated on the two opposite sides of the second pole piece to isolate the first pole piece from the second pole piece.
Due to the adoption of the battery core preparation method, the adaptation capability of the battery core can be improved, the utilization rate of the internal space of the battery is improved, and the size of the battery core is effectively reduced.
The invention also provides a battery manufactured by applying the battery core manufacturing method, which comprises a shell and a battery core arranged in the shell, wherein the battery core comprises a packaging layer and a battery core body, the packaging layer is coated on the outer side of the battery core body, the battery core body is formed by folding a folding body at least once, the folding body comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece is folded to form a U-shaped accommodating cavity, the inner side surface of the U-shaped accommodating cavity is coated with an active substance, the second pole piece is arranged in the U-shaped accommodating cavity, and the diaphragm is folded and coated on the two opposite sides of the second pole piece to isolate the first pole piece from the second pole piece.
Due to the adoption of the battery core preparation method, the adaptation capability of the battery core can be improved, the utilization rate of the internal space of the battery is improved, and the size of the battery is effectively reduced.
Drawings
FIG. 1 is a schematic view of a packaging layer;
FIG. 2 is a schematic structural view of a diaphragm;
FIG. 3 is a schematic view of two opposite sides of a first pole piece, wherein the blank surface is a blank foil surface;
FIG. 4 is a schematic representation of a second pole piece coated on both sides;
FIG. 5 is a schematic view of a second electrode sheet having a single coated side, wherein the blank side is a blank foil side;
fig. 6 is a flow chart of a cell preparation method 1;
fig. 7 is a flow chart of a cell preparation method 2;
fig. 8 is a flow chart of a cell preparation method 3;
fig. 9 is a schematic view of forming a second fold;
fig. 10 is a flow chart of a cell preparation method 4;
FIG. 11 is a schematic view of a first fold of a three-layer structure;
fig. 12 is a schematic view of a second folded body having a six-layer structure;
FIG. 13 is a schematic view of a third fold of twelve ply construction;
fig. 14 is a schematic view of a first fold of a four-layer structure;
fig. 15 is a schematic view of a second folded body having an eight-layer structure;
fig. 16 is a schematic view of a third folded body of sixteen-layer structure.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The first embodiment is as follows:
referring to fig. 1 to 6, this embodiment provides a method for manufacturing a battery cell of a thin lithium ion battery, where the battery cell includes a packaging layer 1 and a battery cell body (2,3,4), where the battery cell body (2,3,4) includes a separator 2, a first electrode plate 3 and a second electrode plate 4, one side surface of the first electrode plate 3 is coated with an active substance, and the other side surface is a blank foil surface, where the blank foil surface means that the side surface is not coated with an active substance; the second pole piece 4 is coated with active on both opposite sides. For example, the first electrode sheet 3 is a negative electrode sheet, the active material of the first electrode sheet may be a negative electrode active material of a lithium ion battery such as graphite or silicide, and the second electrode sheet 4 is a positive electrode sheet, the active material of the second electrode sheet may be a positive electrode active material of a lithium ion battery such as lithium nickel cobalt manganese oxide, lithium cobalt oxide or lithium iron phosphate. Of course, as an alternative, the first pole piece 3 is a positive pole piece, and the second pole piece 4 is a negative pole piece.
Referring to fig. 1 to 6, a first terminal 31 is disposed at an upper end of the first pole piece 3, a first tab 32 is welded on the first terminal 31, a second terminal 41 is disposed at an upper end of the second pole piece 4, and a second tab 42 is welded on the second terminal 41. Wherein, first terminal 31 and second terminal 41 can be cut by the mass flow body that first pole piece 3 and second pole piece 4 used and form, namely, first terminal 31 and first pole piece 3 structure as an organic whole, second terminal 41 and second pole piece 4 structure as an organic whole, or, first terminal 31 and second terminal 41 can be the conductive terminal that the later stage set up, and modes such as accessible welding are connected on corresponding pole piece. The widths of the first terminal 31 and the second terminal 41 are generally more than 2mm wider than the corresponding pole ear, and the heights of the first terminal 31 and the second terminal 41 connected to the pole piece by welding are more than 1mm higher than the welding position, so that the welding is facilitated. The positions of the first terminal 31 and the second terminal 41 can be adjusted according to the tab spacing and the distance from the tab to the edge of the pole piece, and the terminals are only close to the edge of the pole piece for convenience of illustration in the figure.
In a preferred embodiment, the material of the packaging layer 1 may be one of soft packaging films used for lithium ion batteries, such as aluminum plastic films and steel plastic films.
Referring to fig. 6, the cell preparation method includes the following steps of forming the cell body (2,3, 4):
(1) placing the diaphragm 2 on the first pole piece 3, such that the diaphragm 2 covers the active-coated side of the first pole piece 3, as shown in steps ② to ③ in fig. 6;
(2) as in steps ③ to ④ in fig. 6, the second pole piece 4 is placed on the separator 2;
(3) as shown in steps ④ to ⑤ in fig. 6, the separator 2 is folded in half so that the separator 2 covers the two opposite sides of the second pole piece 4, and preferably, the size of the separator 2 needs to be slightly larger than that of the first pole piece 3 in width and length so as to completely cover the second pole piece 4 to separate the first pole piece 3 from the second pole piece 4 and prevent short circuit;
(4) folding the first pole piece 3 in half as in steps ⑤ to ⑥ of fig. 6, so that the first pole piece 3 covers two opposite sides of the diaphragm 2, thereby forming a first fold 100 as shown in fig. 11;
(5) the first fold 100 is folded in half as in steps ⑦ to ⑧ in fig. 6, thereby forming the second fold 200 as shown in fig. 12.
In a specific embodiment, when the requirement of the battery on the thickness dimension is low and the requirement on the length or width dimension is high, the method can further comprise the step (6): the second folded body 200 is folded in half to form a third folded body 300 as shown in fig. 13, thereby further reducing the volume of the cell.
Referring to fig. 3, the direction from the upper edge to the lower edge of the first pole piece 3 is defined as the length direction, and the side perpendicular to the length direction is defined as the width direction, i.e. the direction a is the length direction and the direction b is the width direction.
The present embodiment provides two folding modes of the first pole piece 3 and the diaphragm 2.
Referring to fig. 6, as a first specific embodiment, the length of the first pole piece 3 is greater than the length of the second pole piece 4, and the width of the first pole piece 3 is greater than or equal to the width of the second pole piece 4, and when the above steps (3) and (4) are performed, the first pole piece 3 and the diaphragm 2 are folded in half along the length direction of the first pole piece 3. Preferably, the upper edge of the first pole piece 3 is aligned with its lower edge. The folding mode of the first folded pole piece 3 can facilitate the alignment during folding.
Referring to fig. 7, as a second specific embodiment, the width of the first pole piece 3 is greater than the width of the second pole piece 4, and the length thereof is greater than or equal to the length of the second pole piece 4, and when the above steps (3) and (4) are performed, the first pole piece 3 and the diaphragm 2 are folded in half in the width direction of the first pole piece 3. Preferably, the right edge of the first pole piece 3 is aligned with the left edge thereof. The folding mode of the first folded pole piece 3 can facilitate the alignment during folding. The first pole piece 3 and the diaphragm 2 are folded along the same direction, so that the insulation effect between the folded first pole piece 3 and the folded second pole piece 2 can be ensured.
The present embodiment provides two arrangements of the second pole piece 4.
Referring to fig. 4, as a first specific embodiment, the second pole piece 4 is a pole piece coated with active materials on both opposite sides, and the second pole piece 4 is arranged in a manner that can simplify the processing process to some extent, reduce the steps of forming the cell body (2,3,4), and reduce the thickness of the cell.
Referring to fig. 5 and 10, as a second specific embodiment, the second pole piece 4 is formed by folding a pole piece with one side coated with an active material and the other side coated with an empty foil surface in half, and the folded pole piece has the empty foil surface facing inward and the active material coated side facing outward, so as to form the second pole piece 4 coated on both sides, which may be performed when the above step (2) is performed, that is, the pole piece is placed on the separator 2 such that the active material coated side faces the separator 2, and is folded in half to form the second pole piece 4. Of course, the above operation may be completed before the step (2) is performed. The second pole piece 4 can be folded in half selectively along the length direction or the width direction according to the size specification of the pole pieces, as long as the size of the second pole piece 4 formed by folding in half in the folding direction of the first pole piece 3 is smaller than that of the first pole piece 3, and the thickness of the second pole piece 4 can be increased by the method, so that the strength of the second pole piece 4 is improved.
In the implementation step (5), the doubling back can be implemented along the length direction or the width direction of the first pole piece 3 according to actual requirements. When the step (6) is implemented, the first pole piece 3 can be folded in half along the length direction or the width direction according to actual requirements.
For the above step (5), the present embodiment provides three folding manners of the first folded body 100.
Referring to fig. 6, as a first embodiment, when the first folded body 100 is folded in half in the longitudinal direction, the upper and lower edges of the first folded body 100 are aligned in such a manner as to facilitate alignment when folded in half.
Referring to fig. 9, as a second embodiment, when the first folded body 100 is folded in half in the longitudinal direction, the upper edge of the first terminal 31 and the upper edge of the second terminal 41 are aligned on the same line, and when the first folded body 100 is folded in half, the lower edge of the first folded body 100 and the upper edges of the first terminal 31 and the second terminal 41 are aligned. The upper edge of the first folded body 100 refers to the upper edge of the first folded body 100 from which the separator 2, the first terminal 31, and the first tab 32 have been removed, and the upper edge of the second folded body 200 refers to the upper edge of the second folded body 200 from which the separator 2, the second terminal 41, and the second tab 42 have been removed. In this folding method, the length of the entire cell can be further reduced as compared with the first folding method, and the space inside the battery can be utilized more efficiently, and it should be noted that, in order to realize the second folding method, the first terminal 31 and the second terminal 41 are subjected to insulation treatment before the above-described operation is performed.
Referring to fig. 8, as a third embodiment, as shown in steps ⑦ to ⑧, when the first folded body 100 is folded in half along the width direction of the first pole piece 3, one side edge and the opposite side edge of the first folded body 100 are aligned, which facilitates the alignment in folding in half.
For the step (6), the present embodiment provides two folding manners of the second folding body 200 (the two manners are not shown), and in practical applications, one of the two folding manners may be selected according to the structure of the second folding body 200 for folding.
As a first embodiment, when the second folded body is folded in half in the longitudinal direction of the first pole piece, the upper edge and the lower edge of the second folded body are aligned, which facilitates alignment when folded in half.
As a second embodiment, when the second folded body is folded in half in the width direction of the first pole piece, one side edge and the opposite side edge of the second folded body are aligned, which facilitates alignment when folded in half.
As a specific implementation way, the method further comprises the following steps: and fixing the battery cell body (2,3,4) on the packaging layer 1, so that the battery cell body (2,3,4) can be coated.
Referring to fig. 6 to 8, it is of course possible as an alternative to fix the first pole piece 3 to the packaging layer 1 before step (1) is carried out, so that the empty foil side of the first pole piece 3 faces the packaging layer 1, so that the separator 2 is also fixed to the packaging layer 1 when step (1) is carried out, and so that the second pole piece 4 is also fixed to the packaging layer 1 when step (2) is carried out.
The first pole piece 3, the diaphragm 2 and the second pole piece 4 are fixed on the packaging layer 1 by using a double-sided adhesive layer, or by using other methods such as hot melting. When the double-sided adhesive layer 5 is bonded, one side surface of the double-sided adhesive layer 5 is bonded to the outer cover 1, and the other side surface is bonded to the first terminal 31, the second terminal 41, and the separator 2.
As a modified way, the diaphragm 2 is set to be long enough, as shown in step ⑤ in fig. 6, when the diaphragm 2 is folded in half along the length direction of the first pole piece 3, the lower edge of the diaphragm 2 adheres to the double-sided adhesive layer, thereby improving the fixation of the diaphragm 2, effectively isolating the first pole piece 3 from the second pole piece 4 and improving the insulation effect.
Compared with the prior art, the first folding body 100 formed by the cell preparation method of the invention utilizes the form of folding the first pole piece 3 to cover the second pole piece 4, thereby improving the capacity of the battery by increasing the thickness of the cell on the premise of not changing the length and width of the cell, and in addition, the method can also be suitable for preparing the battery with certain capacity and special requirements on the shape and size, for example, for the battery with the width size which cannot exceed a certain value and the thickness size which does not meet the requirements, the width size of the pole piece can be reduced by the method, and the thickness size of the cell is increased by utilizing the form of folding the first pole piece 3 to ensure the capacity, thereby being adapted to the battery with the special requirements. In addition, the method of the present invention can fold the formed first folded body 100 for multiple times according to actual requirements to reduce the length or width dimension of the battery cell, thereby being suitable for preparing a battery which does not have requirements for the thickness dimension but has certain requirements for the length and width dimension, so as to improve the adaptation capability of the battery cell and improve the utilization rate of the internal space of the battery.
Example two:
the present embodiment provides a specific implementation manner of the first embodiment.
Referring to fig. 1 to 6, the first pole piece 3 is a negative pole piece, the second pole piece 4 is a positive pole, and the second pole piece 4 is a pole piece coated with active substances on both sides, and has a length half of that of the first pole piece 3 and a width similar to that of the first pole piece 3.
The upper edge of the first terminal 31 and the upper edge of the second terminal 41 are located on the same straight line, which is beneficial to the alignment of subsequent folding, and ensures that the first tab 32 and the second tab 42 are located at the same height level, which is beneficial to the assembly of the battery cell.
Referring to step ① of fig. 6, when the cell body (2,3,4) is prepared, the double-sided adhesive layer 5 is first disposed on the packaging layer 1, wherein a distance between the double-sided adhesive layer 5 and an edge of the packaging layer 1 is determined according to a width of a sealed edge of the cell, and is generally more than 1mm from each sealed edge.
After the operation is finished, the following folding operation is carried out:
referring to steps ② to ④ of fig. 6, the first terminal 31 is first adhered to the double-sided adhesive layer 5 to fix the first pole piece 3 to the packaging layer 1 with its foil side facing the packaging layer 1, i.e., with its active-coated side facing away from the packaging layer 1, then the upper edge of the separator 2 is adhered to the double-sided adhesive layer 5 to fix the separator 2 to the packaging layer 1 and to cover the active-coated side of the first pole piece 3, and finally the second terminal 41 is adhered to the double-sided adhesive layer 5 to cover the second pole piece 4 to the separator 2 and to fix it to the packaging layer 1.
Referring to steps ④ to ⑤ in fig. 6, after the above steps are completed, the diaphragm 2 is folded upwards by using the lower edge of the second pole piece 4 as a crease, so that the lower edge of the diaphragm 2 is folded over to the upper edge of the second pole piece 4 to completely cover the second pole piece 4, preferably, when the diaphragm 2 is set to be long enough and the height of the double-sided adhesive layer 5 is large enough, the lower edge of the diaphragm 2 can be adhered to the double-sided adhesive layer 5, thereby improving the fixing stability of the diaphragm 2 and improving the isolation effect between the first pole piece 3 and the second pole piece 4.
Referring to steps ⑤ to ⑥ of fig. 6, the first pole piece 3 is folded upward with the lower edge of the second pole piece 4 as a fold, so that the folded first pole piece 3 covers the separator 2 and the second pole piece 4, and the side of the folded first pole piece 3 coated with the active material faces the separator 2, thereby completing the primary folding, and forming the first folded body 100 having a three-layer structure, specifically, a negative electrode layer-positive electrode layer-negative electrode layer structure as shown in fig. 11.
After the first folding body 100 is completed, the following secondary folding operations are performed, which include the following two folding methods.
Referring to steps ⑦ to ⑧ of fig. 6, in the first folding mode, the first folding body 100 is folded upwards by taking the central line of the first folding body 100 in the length direction as a crease, so that the lower edge of the first folding body 100 is aligned with the upper edge thereof to form the second folding body 200, which can reduce the overall length of the battery cell, the upper edge of the first folding body 100 is defined as the straight line where the upper edges of the first pole piece 3 and the second pole piece 4 are located.
Referring to fig. 9, the second folding mode: in order to form the second folded body 200 by folding the first folded body 100 upward along the longitudinal direction of the first folded body 100 such that the lower edge of the first folded body 100 is aligned with the upper edges of the first terminal 31 and the second terminal 41, the length of the entire battery cell can be further reduced as compared with the first folding method, and the space inside the battery can be more effectively used, it should be noted that the first terminal 31 and the second terminal 41 are insulated before the above-described operation is performed in order to realize the second folding method.
Through the above-described secondary folding operation, the second folded body 200 having a six-layer structure, specifically, a negative-electrode layer-positive-electrode layer-negative-electrode layer structure, as shown in fig. 12, is formed.
After the second folding body 200 is completed, three times of folding operations can be performed according to the actual requirements of the battery, as a specific folding mode: the center line of the second folded body 200 in the length direction is used as a crease, and the second folded body 200 is folded upwards, so that the lower edge of the second folded body 200 is aligned with the upper edge of the second folded body to form a third folded body 300.
Through the above-described three-folding operation, like the two-folding process, the third folded body 300 having the twelve-layer structure shown in fig. 13 is similarly formed.
It should be noted that, in order to ensure the stability of the cell, the cell folding operation generally cannot be performed more than three times, i.e., the folding operation cannot be performed after the third folding body 300 is completed.
Example three:
this embodiment provides a specific implementation manner of the first embodiment, and the implementation manner differs from the second embodiment in the arrangement manner of the second pole piece 4. As shown in fig. 5 and 10, the second pole piece 4 of the present embodiment is formed by folding a pole piece, one side of which is coated with an active material and the other side of which is a hollow foil surface, in half, the length of the pole piece is similar to the length and width of the first pole piece 3, and the hollow foil surface of the folded pole piece faces inward and the side coated with the active material faces outward, so as to form the second pole piece 4, which is similar to the first pole piece, and both sides of which are coated with the active material.
Referring to fig. 10, in a single folding process, the second pole piece 4 is covered on the diaphragm 2, and the side coated with the active substance faces the diaphragm 2, and after the second pole piece 4 is placed, in steps ④ to ⑤, the second pole piece 4 is folded upwards along a central line of the second pole piece 4 in the length direction as a fold, so as to form a structure with coating layers on opposite sides, and then the diaphragm 2 is folded in half, and other steps are the same as those of the first embodiment and are not described herein.
The cell preparation method provided in this embodiment may form the first folded body 100 having a four-layer structure as shown in fig. 14 in a single folding process, form the second folded body 200 having an eight-layer structure as shown in fig. 15 in a second folding process, and form the third folded body 300 having a sixteen-layer structure as shown in fig. 16 in a third folding process.
Example four:
referring to fig. 11 to 13, the present embodiment provides a battery cell manufactured by applying the battery cell manufacturing method according to any one of the first to third embodiments, where the battery cell includes a packaging layer (not shown in the drawings) and a battery cell body (2,3,4), where the packaging layer covers an outer side of the battery cell body (2,3,4), and the battery cell body (2,3,4) is formed by folding a first folding body 100 twice, specifically, the first folding body 100 is folded once to form a second folding body 200, and then folded once to form a third folding body 300, so as to form the battery cell body (2,3, 4).
Due to the fact that the battery core preparation method of the embodiment is applied to the battery core, the adaptation capacity of the battery core can be improved, the utilization rate of the internal space of the battery is improved, the size of the battery core is effectively reduced, and the battery core has corresponding beneficial effects.
Example five:
referring to fig. 11 to 13, the present embodiment provides a battery manufactured by applying the cell manufacturing method according to any one of the first to third embodiments, where the battery includes a casing (not shown in the casing) and a cell disposed in the casing, where the cell includes a packaging layer (not shown in the packaging layer) and a cell body (2,3,4), the packaging layer is coated on an outer side of the cell body (2,3,4), and the cell body (2,3,4) is formed by folding a first folding body 100 twice, specifically, the first folding body 100 is folded once to form a second folding body 200, and is folded once again to form a third folding body 300, so as to form the cell body (2,3, 4).
Due to the fact that the battery is provided with the battery cell preparation method, the battery can improve the adaptation capacity of the battery cell, improve the utilization rate of the internal space of the battery, effectively reduce the size of the battery cell, and have corresponding beneficial effects.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (12)
1. The preparation method of the battery core of the thin lithium ion battery comprises the following steps of:
a diaphragm;
the electrode comprises a first pole piece, a second pole piece and a third pole piece, wherein one side surface of the first pole piece is coated with an active substance, the other side surface of the first pole piece is a hollow foil surface, the upper edge of the first pole piece is provided with a first terminal, and the first terminal is connected with a first tab;
the two opposite sides of the second pole piece are coated with active matters, the upper edge of the second pole piece is provided with a second terminal, and the second terminal is connected with a second tab;
the method is characterized by comprising the following steps of:
(1) placing the diaphragm on the first pole piece, and enabling the diaphragm to cover one surface, coated with the active matter, of the first pole piece;
(2) placing a second pole piece on the membrane;
(3) folding the diaphragm in half so that the diaphragm is coated on two opposite sides of the second pole piece;
(4) folding the first pole piece in half so that the first pole piece is wrapped on the two opposite sides of the diaphragm to form a first folding body;
(5) the first fold is folded in half to form a second fold.
2. The battery cell preparation method of claim 1, wherein in the step (5) is carried out;
when the first folding body is folded in half along the length direction of the first pole piece, aligning the upper edge and the lower edge of the first folding body, or aligning the lower edge of the first folding body and the upper edges of the first terminal and the second terminal;
or when the first folding body is folded in half along the width direction of the first pole piece, one side edge and the opposite side edge of the first folding body are aligned.
3. The cell preparation method of claim 1, wherein steps (3) and (4) are performed;
folding the first pole piece and the diaphragm in half along the length direction of the first pole piece;
or;
and folding the first pole piece and the diaphragm in half along the width direction of the first pole piece.
4. The method for preparing the battery cell of any one of claims 1 to 3, wherein the second pole piece is a pole piece coated with active substances on two opposite side faces;
or the second pole piece is formed by folding the pole piece with one side coated with the active matter and the other side being a hollow foil surface in half, and the hollow foil surface of the folded pole piece faces inwards and the surface coated with the active matter faces outwards.
5. The cell preparation method of any one of claims 1 to 3, further comprising a step (6): and folding the second folded body in half to form a third folded body.
6. The battery cell preparation method of claim 5, wherein in the step (6) is carried out;
when the second folded body is folded along the width direction of the first pole piece, aligning one side edge and the opposite side edge of the second folded body;
alternatively, the first and second electrodes may be,
and aligning the upper edge and the lower edge of the second folded body when the second folded body is folded along the length direction of the first pole piece.
7. The method for preparing the battery cell of claim 1, further comprising the steps of:
connecting a first pole piece and the packaging layer before the step (1) is carried out, so that the empty foil surface of the first pole piece faces the packaging layer, connecting a diaphragm and the packaging layer when the step (1) is carried out, and connecting a second pole piece and the packaging layer when the step (2) is carried out.
8. The method for preparing the battery cell of claim 7, wherein the first pole piece, the diaphragm, the second pole piece and the packaging layer are respectively connected through a double-sided adhesive layer, one side surface of the double-sided adhesive layer is connected with the packaging layer, and the other side surface of the double-sided adhesive layer is respectively connected with the first terminal, the second terminal and the diaphragm.
9. The battery core preparation method of claim 8, wherein in the step (3), the separator is folded in half along the length direction of the first pole piece, so that the lower edge of the separator is adhered to the double-sided adhesive layer.
10. The method for preparing the battery cell of claim 1, further comprising the steps of: and fixing the battery cell body on the packaging layer.
11. An electric core manufactured by applying the electric core preparation method of any one of claims 1 to 10, comprising a packaging layer and an electric core body, wherein the packaging layer is coated on the outer side of the electric core body, the electric core body is formed by folding a folding body at least once, the folding body comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece is folded to form a U-shaped accommodating cavity, the inner side surface of the U-shaped accommodating cavity is coated with an active substance, the second pole piece is arranged in the U-shaped accommodating cavity, and the diaphragm is folded and coated on two opposite sides of the second pole piece to isolate the first pole piece from the second pole piece.
12. A battery manufactured by applying the cell preparation method of any one of claims 1 to 10, comprising a casing and a cell disposed in the casing, wherein the cell comprises a packaging layer and a cell body, the packaging layer is coated on the outer side of the cell body, the cell body is formed by folding a folding body at least once, the folding body comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece is folded to form a U-shaped accommodating cavity, the inner side surface of the U-shaped accommodating cavity is coated with an active substance, the second pole piece is disposed in the U-shaped accommodating cavity, and the diaphragm is folded to coat on two opposite sides of the second pole piece to isolate the first pole piece from the second pole piece.
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| CN201911219237.8A CN110931885A (en) | 2019-12-03 | 2019-12-03 | Preparation method of battery core of thin lithium ion battery, and battery core and battery applying same |
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| CN112635845A (en) * | 2020-12-22 | 2021-04-09 | 武汉昊诚能源科技有限公司 | Preparation method of battery cell structure and battery cell structure |
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