CN115000526A - Battery cell lamination structure, preparation method and electrochemical device - Google Patents
Battery cell lamination structure, preparation method and electrochemical device Download PDFInfo
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- CN115000526A CN115000526A CN202210673869.7A CN202210673869A CN115000526A CN 115000526 A CN115000526 A CN 115000526A CN 202210673869 A CN202210673869 A CN 202210673869A CN 115000526 A CN115000526 A CN 115000526A
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
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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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- 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
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the field of lithium ion batteries, and discloses a battery core lamination structure, a preparation method and an electrochemical device; the diaphragm comprises bonded diaphragms which are stacked and a gap diaphragm which is arranged between the adjacent bonded diaphragms; the laminated battery core structure provided by the application overcomes the problems of complex structure, complex preparation process and cost of the laminated stacked battery core structure in the prior art, and the battery core laminated structure alternately bonds the negative pole pieces and the positive pole pieces in the gaps of the adjacent bonding diaphragms through the adhesive layers, so that the laminated battery core structure has the technical effects of simple structure, high firmness and high safety; the preparation method of the battery core lamination structure has the technical effects of simplicity in operation, low cost and high production efficiency.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a battery core lamination structure, a preparation method and an electrochemical device.
Background
The basic unit of the lithium ion battery is in a positive electrode/diaphragm/negative electrode structure, the basic unit is stacked or wound to form a battery cell of the lithium ion battery, and then the battery cell, electrolyte, a lug and a battery shell are assembled to form the lithium ion battery; the prior art processes for lithium ion battery cells basically include a winding process, a stacking process and a laminating process.
The winding process has high demand on the coating preparation process of the pole piece, the used pole piece needs certain elasticity and bendability, the falling or the fracture of an active material during winding is avoided, and meanwhile, the tension of the front surface and the side surface of the battery cell manufactured by winding is inconsistent, and the internal electrochemical reaction is not uniform; the stacking process adopts Z-shaped lamination, the diaphragm and the pole piece are not bonded, the pole piece is grabbed by a mechanical arm and correspondingly laminated on the diaphragm belt, the production efficiency is low, and the defects of folds and the like are easily generated on the interface between the diaphragm and the pole piece in the battery with longer processing size; the lamination process is an improvement aiming at the defects of the stacking process, and can obviously improve the production efficiency, but the lamination process adopts the steps that the first pole piece is inserted into the diaphragm, and then the second pole piece is bonded between the diaphragms at the outer sides of the two adjacent first pole pieces, so that the process operation is complicated, the production efficiency is low, and the cost is high.
As disclosed in publication No. CN113611912B, a lamination structure of an electrode assembly includes a plurality of lamination units arranged in a lamination manner, the lamination units including a diaphragm flat cavity formed by a diaphragm, a first pole piece disposed in the diaphragm flat cavity, and a second pole piece disposed outside the diaphragm flat cavity; one side of the flat cavity of the diaphragm extends upwards to form a connecting film which is connected with the corresponding same side of the flat cavity of the diaphragm of the adjacent lamination unit above, the other side of the flat cavity of the diaphragm is disconnected with the corresponding same side of the diaphragm through cavity of the adjacent lamination unit above, and the dislocation of the first pole piece and the second pole piece when the battery vibrates can be effectively avoided or reduced.
Disclosure of Invention
In order to solve the problems of complex structure, complicated preparation process and high cost of a laminated stacked battery cell structure in the prior art, the battery cell laminated structure, the preparation method and the electrochemical device are provided, the battery cell laminated structure provided by the application alternately bonds a negative plate and a positive plate in a gap between adjacent bonding diaphragms through adhesive layers, and the battery cell laminated structure has the technical effects of simple structure, high firmness and high safety; the preparation method of the battery core lamination structure has the technical effects of simplicity in operation, low cost and high production efficiency.
The specific technical scheme of the invention is as follows:
the utility model provides a battery core lamination structure, includes the diaphragm that piles up the setting, establish the glue film in the diaphragm both sides, establish the negative pole piece that piles up in the clearance with the glue film and establish the positive plate that piles up in the clearance with the glue film connection at adjacent diaphragm, the diaphragm is including the bonding diaphragm of range upon range of setting and set up the clearance diaphragm between adjacent bonding diaphragm.
The application provides an electricity core lamination stack structure bonds negative pole piece and positive plate on bonding the diaphragm in turn, rethread buckle clearance diaphragm piles up negative pole piece and positive plate on making bonding diaphragm in turn, bond negative pole piece and positive plate in the clearance that adjacent two-layer bonding diaphragm formed through the glue film again, fix negative pole piece and positive plate on the diaphragm through the glue film and can not appear the dislocation, the fastness is stronger, electricity core lamination stack structure is when receiving external force extrusion simultaneously, because the glue film keeps apart electrode slice and diaphragm, the electrode slice is showing the reduction to the destruction of diaphragm, the security is high.
Preferably, the length of the gap diaphragm is 1-5 μm.
Preferably, the thickness of the glue layer is 0.01-0.05 mm.
Preferably, the base film of the gluing diaphragm is a composite single-layer film of polyethylene, polypropylene and a combination of polyethylene and polypropylene, and the thickness of the base film is 6-20 mu m.
Preferably, the adhesive layer comprises a hot melt adhesive and inorganic particles, the mass part ratio of the hot melt adhesive to the inorganic particles is 20-50: 50-80, the hot melt adhesive is selected from one or more of polyvinylidene fluoride, polymethyl methacrylate, poly-p-phenylene terephthalamide and poly-m-phenylene terephthalamide, and the inorganic particles are selected from one or more of alumina ceramic, boehmite, magnesia ceramic and silicon oxide; the glue film is insulating glue film in this application, insulating inorganic particle has been added in the glue film, can improve the separation performance of diaphragm, the glue film of this application is at the bonding in-process, inorganic particle forms one deck space bar in pole piece and the centre of bonding diaphragm, prevent that pole piece and diaphragm from melting the back with the hot melt adhesive and laminating together, above-mentioned structure can make electric core structure when receiving external pressure, prevent that positive plate and negative pole piece from piercing through the diaphragm when receiving the extrusion and causing the short circuit, the security that has showing and improving electric core.
A preparation method of a battery cell lamination structure comprises the following preparation steps:
(1) coating the adhesive layer on the diaphragm according to the coverage ratio of 20-100%, and cutting the diaphragm, the positive plate and the negative plate according to a certain width;
(2) preheating and rolling the cut negative pole pieces to the side surface of the bonding diaphragm to form a first complex, preheating and rolling the cut positive pole pieces to the other side surface of the bonding diaphragm adjacent to the first complex by using an interval gap diaphragm to form a second complex, and alternately arranging the first complex and the second complex according to the extension direction of the diaphragm;
(3) bending the clearance diaphragm, sequentially attaching one surface of the negative electrode layer which is not attached with the bonding diaphragm to the side surface of the bonding diaphragm of the adjacent positive electrode layer, attaching one surface of the positive electrode layer which is not attached with the side surface of the bonding diaphragm of the adjacent negative electrode layer, alternately stacking the negative electrode layer and the positive electrode layer, and performing hot pressing to form a battery cell lamination structure after the setting is completed;
(4) and sticking the adhesive tape on the outer side of the cell lamination structure to prepare the naked cell.
According to the preparation method provided by the application, the negative plate is preheated and rolled to the side surface of the bonding diaphragm to form a first complex, then the gap diaphragm is used as a spacing segment, and the positive plate is preheated and rolled to the other side surface of the bonding diaphragm adjacent to the negative plate to form a second complex; make first complex body and second complex body alternating arrangement along diaphragm extending direction, through the clearance diaphragm of buckling, the negative pole layer one side that will not laminate bonding diaphragm is laminated with the diaphragm side that bonds of adjacent positive pole layer, laminate positive pole layer one side that will not laminate with the diaphragm side that bonds of adjacent negative pole layer again, make the negative pole layer arrange in the outside of positive pole layer all the time, carry out the hot pressing after the setting is accomplished, in the hot pressing process, the glue film is with negative pole piece and positive pole piece and the bonding diaphragm bonding of both sides together and is made electric core lamination, above-mentioned in-process need not to process the diaphragm, only need through the rubber coating → cut-parts → alternative preforming → lamination pile up and can make electric core lamination, above-mentioned preparation process can go on in succession, preparation easy operation and production efficiency show and improve, while production cost is showing and is reducing.
Preferably, the thickness of the glue layer in the step (1) is 1-5 μm.
Preferably, the preheating temperature in the step (2) is 30-90 ℃, and the rolling pressure is 0.1-2.0 MPa.
Preferably, in the step (3), the hot pressing temperature is 30-120 ℃, the hot pressing pressure is 20-5000kg, and the hot pressing time is 2-600 s.
An electrochemical device comprises the laminated structure or is prepared by adopting the preparation method of the laminated structure.
Compared with the prior art, the method has the following technical effects:
(1) according to the battery cell lamination structure, the negative plates and the positive plates are alternately bonded in the gaps of the adjacent bonding diaphragms through the adhesive layers, and the battery cell lamination structure has the technical effects of simple structure, high firmness and high safety;
(2) the preparation method of the battery core lamination structure has the technical effects of simplicity in operation, low cost and high production efficiency.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of the preparation process of the present invention.
In the figure, a separator 1, a bonding separator 101, a gap separator 102, a subbing layer 2, a negative electrode sheet 3, a positive electrode sheet 4, a first composite 5, and a second composite 6.
Detailed Description
The present invention will be further described with reference to the following examples.
The starting materials used in the present invention are, unless otherwise specified, commercially available or commonly used in the art, e.g.
The methods in the following examples are conventional in the art and are not specifically described
Example 1:
as shown in fig. 1, a cell lamination structure includes a separator 1 stacked, adhesive layers 2 disposed on two sides of the separator, a negative plate 3 disposed in a separator stacking gap and connected to the adhesive layers, and a positive plate 4 disposed in an adjacent separator stacking gap and connected to the adhesive layers, where the negative plate includes a negative current collector and negative slurry disposed on two sides of the negative current collector, and the positive plate includes a positive current collector and positive slurry disposed on two sides of the positive current collector; the number of the negative plates is 5, the number of the positive plates is 4, the battery cell lamination structure extends from the tail end of the battery cell to the head end of the battery cell and is sequentially arranged by the sequence of the negative plates, the positive plates and the negative plates, the negative plates are arranged on two sides of the battery cell lamination structure, the diaphragm base film is a polyethylene film with the thickness of 10 micrometers, the thickness of the glue layer on one side is 2 micrometers, the glue material is polyvinylidene fluoride, the ceramic is boehmite, the mass fraction ratio of the polyvinylidene fluoride to the ceramic is 3:7, and the coverage area of the glue layer on the base film reaches 80%; the diaphragm is including the bonding diaphragm 102 of range upon range of setting and setting up the clearance diaphragm 101 between adjacent bonding diaphragm, and clearance diaphragm length is 2mm, and the clearance diaphragm is crooked form, and the hot pressing condition is after the pile: the hot pressing pressure is 500kg, the hot pressing temperature is 85 ℃, the hot pressing time is 60s, and the naked electric core is fixed and circulated downwards by gluing all around.
Example 2:
as shown in fig. 2, a method for manufacturing a cell structure includes the following steps:
(1) coating a glue layer on a diaphragm according to the coverage proportion of 50%, wherein the base film of the diaphragm is a polypropylene film with the thickness of 12 mu m, the single-side coating thickness is 4 mu m, the material of the hot melt adhesive is polymethyl methacrylate, the inorganic particles are aluminum oxide, the mass part ratio of the hot melt adhesive to the ceramic is 4:6, the diaphragm, a positive plate and a negative plate are cut according to a certain width, the width of the diaphragm is 200mm, the cutting width of the positive plate is 193 x 95mm, and the cutting width of the negative plate is 196 x 98 mm;
(2) preheating and rolling the cut negative pole pieces to the side surface of the bonding diaphragm to form a first complex 5, preheating and rolling the cut positive pole pieces to the other side surface of the bonding diaphragm adjacent to the first complex by using a gap diaphragm to form a second complex 6, and alternately arranging the first complex and the second complex according to the extension direction of the diaphragm; preheating temperature is 50 ℃, rolling pressure is 0.5MPa, and the width of the gap diaphragm is 3 mm;
(3) bending the gap diaphragm, sequentially attaching one surface of the negative electrode layer which is not attached with the bonding diaphragm to the side surface of the bonding diaphragm of the adjacent first complex, attaching one surface of the second complex which is not attached with the side surface of the bonding diaphragm of the adjacent first complex, alternately stacking the first complex and the second complex, and performing hot pressing to form a battery cell lamination structure after the setting is completed, wherein the hot pressing conditions are that the hot pressing pressure is 1000kg, the hot pressing temperature is 95 ℃, and the hot pressing time is 120 s;
(4) and (3) sticking the adhesive tape on the outer side of the cell lamination structure to form a naked cell and make the naked cell flow downwards.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a battery core lamination structure, characterized by, including piling up diaphragm (1) that sets up, establishing glue film (2) in the diaphragm both sides, establishing negative pole piece (3) that the diaphragm piles up in the clearance and be connected with the glue film and establishing positive plate (4) that adjacent diaphragm piled up in the clearance and be connected with the glue film, the diaphragm is including the bonding diaphragm (101) of range upon range of setting and setting up at the interval diaphragm (102) of adjacent bonding diaphragm within a definite time.
2. The cell lamination stack of claim 1, wherein the length of the gap diaphragm is 1 to 5 mm.
3. The cell lamination structure of claim 1, wherein the adhesive layer has a thickness of 1 to 5 μm.
4. The battery cell lamination structure of claim 1, wherein the adhesive layer comprises 20-50: 50-80 parts by weight of a hot melt adhesive and inorganic particles, the hot melt adhesive is selected from one or more of polyvinylidene fluoride, polymethyl methacrylate, poly (p-phenylene terephthalamide) and poly (m-phenylene terephthalamide), and the inorganic particles are selected from one or more of alumina ceramic, boehmite, magnesium oxide ceramic and silica.
5. A preparation method of a battery cell lamination structure is characterized by comprising the following preparation steps:
(1) coating the glue layer on the diaphragm according to the coverage ratio of 20-100%, and cutting the diaphragm, the positive plate and the negative plate according to a certain width;
(2) preheating and rolling the cut negative pole pieces to the side surface of the bonding diaphragm to form a first complex, preheating and rolling the cut positive pole pieces to the other side surface of the bonding diaphragm adjacent to the first complex by using an interval gap diaphragm to form a second complex, and alternately arranging the first complex and the second complex according to the extension direction of the diaphragm;
(3) bending the clearance diaphragm, sequentially attaching one surface of the negative electrode layer which is not attached with the bonding diaphragm to the side surface of the bonding diaphragm of the adjacent positive electrode layer, attaching one surface of the positive electrode layer which is not attached with the side surface of the bonding diaphragm of the adjacent negative electrode layer, alternately stacking the negative electrode layer and the positive electrode layer, and performing hot pressing to form a battery cell lamination structure after the setting is completed;
(4) and sticking the adhesive tape on the outer side of the cell lamination structure to prepare the naked cell.
6. The method for preparing a cell structure according to claim 5, wherein the thickness of the adhesive layer in step (1) is 1 to 5 μm.
7. The method for preparing a cell structure according to claim 5, wherein the preheating temperature in step (2) is 30-90 ℃ and the rolling pressure is 0.1-2.0 MPa.
8. The method for preparing a cell structure according to claim 6, wherein the hot pressing temperature in step (3) is 30-120 ℃, the hot pressing pressure is 20-5000kg, and the hot pressing time is 2s-600 s.
9. An electrochemical device comprising a laminate structure according to any one of claims 1 to 4 or produced by a method of producing a laminate structure according to any one of claims 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673869.7A CN115000526A (en) | 2022-06-14 | 2022-06-14 | Battery cell lamination structure, preparation method and electrochemical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673869.7A CN115000526A (en) | 2022-06-14 | 2022-06-14 | Battery cell lamination structure, preparation method and electrochemical device |
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| Publication Number | Publication Date |
|---|---|
| CN115000526A true CN115000526A (en) | 2022-09-02 |
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|---|---|---|---|
| CN202210673869.7A Pending CN115000526A (en) | 2022-06-14 | 2022-06-14 | Battery cell lamination structure, preparation method and electrochemical device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115775924A (en) * | 2023-01-09 | 2023-03-10 | 江苏正力新能电池技术有限公司 | Battery cell, battery and battery cell manufacturing method |
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2022
- 2022-06-14 CN CN202210673869.7A patent/CN115000526A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115775924A (en) * | 2023-01-09 | 2023-03-10 | 江苏正力新能电池技术有限公司 | Battery cell, battery and battery cell manufacturing method |
| CN115775924B (en) * | 2023-01-09 | 2024-07-16 | 江苏正力新能电池技术有限公司 | Battery cell, battery and battery cell manufacturing method |
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