CN109560253A - Negative electrode tab component and preparation method thereof, the method and battery for preparing battery - Google Patents
Negative electrode tab component and preparation method thereof, the method and battery for preparing battery Download PDFInfo
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- CN109560253A CN109560253A CN201810749276.8A CN201810749276A CN109560253A CN 109560253 A CN109560253 A CN 109560253A CN 201810749276 A CN201810749276 A CN 201810749276A CN 109560253 A CN109560253 A CN 109560253A
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- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 238000013329 compounding Methods 0.000 claims 2
- 239000012528 membrane Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 238000002955 isolation Methods 0.000 abstract description 55
- 238000005098 hot rolling Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 16
- 230000035939 shock Effects 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 11
- 150000001875 compounds Chemical class 0.000 abstract description 10
- 238000003475 lamination Methods 0.000 abstract description 9
- 238000010521 absorption reaction Methods 0.000 abstract description 6
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- H01M4/139—Processes of manufacture
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The present invention provides negative electrode tab components and preparation method thereof; prepare the method and battery of battery; preparation negative electrode tab component method include: by heat be compounded in strip negative electrode tab upper and lower surfaces on adsorb isolation film; to obtain stepped construction; wherein; when carrying out the compound hot roll process of the heat, protective film is used in the outer surface of the isolation film；The stepped construction is cut, to obtain negative electrode tab component.Battery is prepared using the negative electrode tab component, step greatly simplifies in assembling process, and working efficiency significantly improves; for Stackable batteries; lamination efficiency can promote three times, and realize absorption between every layer of structure of the battery prepared and combine, the shock resistance of battery; anti-vibration; the performances such as safety are substantially improved, and improve product quality, and when hot-rolling pressure; increase protective film in the outer surface of isolation film, the coating shedding of isolation film surface can be effectively prevented or is bonded in the surface of hot-rolling pressure roller.
Description
Technical field
The present invention relates to chemical cell technical fields, specifically, being related to negative electrode tab component and preparation method thereof, preparing battery
Method and battery.
Background technique
The advantages that lithium ion battery has specific energy high, and the service life is long, safety, environmentally friendly has been widely used in notebook electricity
The fields such as brain, mobile phone, digital camera, electric car, energy storage.With the continuous development of the demands such as computer, mobile phone, electric car,
It is required that battery has higher energy density.
Currently, the method for making electric core of lithium ion battery mainly has two kinds of winding and stacking.Cylindrical and rectangular lithium ion
Battery generallys use winding method, and stack manner on the rectangular cell of part mainly in soft-package battery production using and making
With.Winding be by positive plate, diaphragm, negative electrode tab alignment after, it is co-wound together.Its pole piece quantity is few, high-efficient, winding speed
Degree can reach tens ppm.But there are unbalance stress in charge and discharge process, battery core easily deforms takeup type battery core, leads to electricity
Pond penalty, or even there is security risk.In addition, the electrode leaf length of takeup type battery core is longer, the quantity that tab is drawn is few,
Therefore the internal resistance of takeup type battery core is higher.Stacked is to be alternately stacked multi-disc positive plate, diaphragm, negative electrode tab together, at present
Lamination process mostly uses greatly " Z " lamination process, and the positive and negative plate of single layer is alternately realized on Z-shaped isolation film and is laminated, stacking
It carries out rubberizing afterwards to fix, battery is directly packaged into shell after lamination.In space utilization rate, stack battery core is than takeup type electricity
Core has higher utilization rate, therefore can obtain higher energy density.But battery directly encapsulates after lamination, and battery is using
Can misplace between inner layers in the process, especially on automobile in application, when vibration or collision occur, in battery
Staggered floor easily occurs between the pole piece in portion, cell safety is impacted.
Thus, current battery still has much room for improvement.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of negative electrode tab component, and the battery with the negative electrode tab component has a higher safety, shock resistance,
Anti-vibration, the performances such as anti-safety are substantially improved, and lamination efficiency is more significant than traditional lamination efficiency in preparation process, equipment investment quantity
It reduces or product quality is obviously improved.
In one aspect of the invention, the present invention provides a kind of methods for preparing negative electrode tab component.It is according to the present invention
Embodiment, this method comprises: isolation film is adsorbed in the upper and lower surfaces for the negative electrode tab for being compounded in strip by heat, to obtain
Stepped construction, wherein when carrying out the compound hot roll process of the heat, use protective film in the outer surface of the isolation film；
The stepped construction is cut, to obtain negative electrode tab component.In this way, negative electrode tab component can be quickly and effectively prepared, and
Isolation film is directly adsorbed in negative electrode tab in advance, step greatly simplifies in further battery assembling process, and working efficiency obviously mentions
Height, for Stackable batteries, lamination efficiency can promote three times, realize absorption between every layer of structure of the battery prepared
In conjunction with, the shock resistance of battery, anti-vibration, the performances such as safety are substantially improved, and improve product quality, and when hot-rolling is pressed, are being isolated
The outer surface of film uses protective film, and the coating shedding of isolation film surface can be effectively prevented or be bonded in the surface of hot-rolling pressure roller,
The quality for guaranteeing negative electrode tab component after heat is compound, improves yield, and protective film can be reused.
According to an embodiment of the invention, the negative electrode tab, the isolation film and the protective film provide as coils.
According to an embodiment of the invention, the compound load of the heat is between 1000kgf-3000kgf, temperature 80 DEG C-
Between 110 DEG C, speed is between 15m/min-30m/min.
According to an embodiment of the invention, the compound load of the heat is between 1000kgf-3000kgf, temperature 80 DEG C-
Between 110 DEG C, speed is between 15m/min-30m/min.
In another aspect of this invention, the present invention provides a kind of negative electrode tab components.According to an embodiment of the invention, cathode
Piece component is prepared by mentioned-above method.When the negative electrode tab component is applied to Stackable batteries, Ke Yixian
It writes and improves preparation efficiency, reduce equipment and human input amount, and can be achieved to inhale between the every layer of structure of Stackable batteries obtained
Attached combination, the shock resistance of battery, anti-vibration, the performances such as safety are substantially improved, and improve product quality.
In another aspect of the invention, the present invention provides a kind of negative electrode tab components.According to an embodiment of the invention, this is negative
Pole piece component includes: negative electrode tab；Isolation film, the isolation film are adsorbed in the upper and lower surfaces of the negative electrode tab, and
On length direction, the both ends of the isolation film are aligned with the both ends of the negative electrode tab respectively.The negative electrode tab component is applied to layer
Every layer of the Stackable batteries knot that when stacked battery, preparation efficiency can be significantly improved, reduce equipment and human input amount, and obtained
Absorption can be achieved between structure to combine, the shock resistance of battery, anti-vibration, the performances such as safety are substantially improved, and improve product quality.
According to an embodiment of the invention, the bonding force between the isolation film and the negative electrode tab is 1.0N/m-9.0N/m.
According to an embodiment of the invention, the bonding force between the isolation film and the negative electrode tab is 5.5N/m-9.0N/m.
In still another aspect of the invention, the present invention provides a kind of methods for preparing battery.According to an embodiment of the invention,
This method comprises: preparing negative electrode tab component using mentioned-above method；By multiple negative electrode tab components and multiple positive plates
It is alternately stacked, obtains stacking product, the top layer for stacking product and lowest level are the negative electrode tab component；To the heap
It folds product and carries out hot pressing.This method step is simple, easy to operate, easily controllable, and obtaining can be real between each layer structure of battery
Now absorption combines, and can effectively reduce each layer in use and inconsistent phenomenon, the shock resistance of battery, anti-vibration, safety occurs
Etc. performances be substantially improved.
According to an embodiment of the invention, the load of hot pressing is between 1000kgf-3000kgf, temperature 80 DEG C -110 DEG C it
Between, the time is between 15s-120s.
In another aspect of this invention, the present invention provides a kind of batteries.According to an embodiment of the invention, the battery includes
It mentioned-above negative electrode tab component or is prepared by mentioned-above method.The battery includes mentioned-above cathode
Whole feature and advantage of piece component and battery core, this is no longer going to repeat them.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for the preparation negative electrode tab component of one embodiment of the invention.
Fig. 2 is the hot composition process flow diagram of one embodiment of the invention.
Fig. 3 is the schematic diagram for cutting stepped construction of one embodiment of the invention.
Fig. 4 is the structural schematic diagram of the negative electrode tab component of one embodiment of the invention.
Fig. 5 is the flow diagram of the method for preparing battery of one embodiment of the invention.
Fig. 6 is the structural schematic diagram of the positive plate of one embodiment of the invention.
Fig. 7 is the structural schematic diagram of the stacking product of one embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail.The embodiments described below is exemplary, and is only used for explaining this hair
It is bright, and be not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to text in the art
It offers described technology or conditions or is carried out according to product description.Reagents or instruments used without specified manufacturer,
For can be with conventional products that are commercially available.
In one aspect of the invention, the present invention provides a kind of methods for preparing negative electrode tab component.It is according to the present invention
Embodiment, referring to Fig.1, this method comprises:
S100: isolation film is adsorbed in the upper and lower surfaces for the negative electrode tab for being compounded in strip by heat, to obtain layer
Stack structure (structural schematic diagram is referring to Fig. 3), wherein when carrying out the compound hot roll process of the heat, in the isolation film appearance
Face (i.e. surface of the isolation film far from negative electrode tab) uses protective film.
It should be noted that negative electrode tab and isolation film do not melt in hot recombination process, negative electrode tab and isolation film are adding
It is combined under heat, pressurized conditions by intermolecular force absorption.
According to an embodiment of the invention, negative electrode tab is in continuous strip, it may include metal foil (such as copper foil) and load
Negative electrode active material (such as graphite) in metal foil surface, specific metal foil type and negative electrode active material type ability
Field technique personnel can select according to actual needs, such as can be any of metal foil in this field and negative electrode active
Material.
According to an embodiment of the invention, the specific type of isolation film can be the microporous barrier of polyolefin preparation, including but not
It is limited to polyethylene separators, polypropylene isolation film and polyethylene polypropylene composite isolated film etc..In some embodiments of the present invention
In, isolation film surface is band plastic structure (i.e. isolation film surface contains glue), can be bonded in from there through hot composite isolated film negative
Pole piece, and bonding force is stronger, is not easy to misplace after forming battery so that negative electrode tab component and positive plate stack, stability and peace
Full property is more preferable.
According to an embodiment of the invention, specific type those skilled in the art of protective film can according to actual needs flexibly
Selection, as long as protective film setting can be isolated before hot-rolling pressure with effective protection isolation film in hot nipping process
Film outer surface, hot-rolling pressure later again removes protective film, it is possible thereby to effectively prevent the coating shedding or bonding of isolation film surface
On the surface of hot-rolling pressure roller, guarantee the quality of negative electrode tab component after heat is compound, improves yield, and the protective film can carry out repeating benefit
With, environmental protection and cost is relatively low.
Some specific embodiments according to the present invention, referring to Fig. 2 (wherein arrow, which is shown, cuts position), negative electrode tab 10,
Isolation film 20 and protective film 30 provide as coils, and there is hollow material cup in centre, in the step can directly by negative electrode tab 10,
Isolation film 20 and 30 coiled material of protective film are assemblied on the hanging scroll of thermal composite machine, and centre is negative electrode tab 10, the two sides point of negative electrode tab 10
It is not followed successively by isolation film 20 and protective film 30, by negative electrode tab 10, isolation film 20 and protective film 30 while blowing, then passes through hot-rolling
It presses station 40 (such as hot-rolling pressure furnace), isolation film is adsorbed on negative electrode tab surface after hot-rolling pressure, and protective film can be returned by reel wound
It receives to reuse.
According to an embodiment of the invention, in order to enable the bonding force between negative electrode tab and isolation film (adsorbs the combination combined
Power or the bonding force formed by glue sticking) more preferably, to improve the safety of the battery using the negative electrode tab component, inventor couple
Hot composition process parameter has carried out careful investigation and optimization, and in some embodiment of the invention, the load of the hot-rolling pressure exists
Between 1000kgf-3000kgf (such as 1000kgf, 1500kgf, 2000kgf, 2500kgf, 3000kgf), temperature is at 80 DEG C -110
Between DEG C (80 DEG C, 85 DEG C, 90 DEG C, 95 DEG C, 100 DEG C, 105 DEG C, 110 DEG C), speed is (i.e. negative between 15m/min-30m/min
The dispensing speed of pole piece, isolation film and protective film is 15m/min-30m/min, such as 15m/min, 20m/min, 25m/min, 30m/
min).Thus, it is possible to which the bonding force of negative electrode tab and isolation film is remarkably reinforced, 1.0N/m-9.0N/m can reach, even up to
To 5.0N/m-9.0N/m, such as 5.5N/m-9.0N/m.In particular embodiments of the invention, the compound load of the heat exists
Between 1500kgf-2500kgf, temperature is between 80 DEG C -110 DEG C, and speed is between 15m/min-30m/min.Cathode as a result,
The absorption binding force of piece and isolation film further enhances, and can reach 5.0N/m or more (being greater than 5.0N/m) or can reach
More than 5.5N/m.
S200: cutting the stepped construction, to obtain negative electrode tab component.
According to an embodiment of the invention, negative electrode tab and isolation film are continuous states in above-mentioned steps, in order to be had
The negative electrode tab component of suitable dimension needs the stepped construction to above-mentioned acquisition to be cut to obtain the cathode with predetermined size
Piece component, there is no limit as long as being convenient for cutting stepped construction, such as can be punching etc. to specific cutting method.
Some specific embodiments according to the present invention, referring to Fig. 3, (wherein, upper figure is top view, and the following figure is main view, arrow
Head, which is shown, cuts position), the stepped construction 50 of above-mentioned acquisition is in continuous strip, is arranged at intervals with multiple poles in negative electrode tab
Ear 51, the position shown in arrow cut stepped construction 50, can be obtained negative electrode tab component A.
By the above method, negative electrode tab component can be quickly and effectively prepared, and isolation film is directly adsorbed in into negative electrode tab
On, step greatly simplifies in further battery assembling process, and working efficiency significantly improves, and for Stackable batteries, lamination efficiency can
To promote three times, combination, the shock resistance of battery, anti-vibration, safety etc. are realized between every layer of structure of the battery prepared
Performance is substantially improved, and improves product quality, and when hot-rolling pressure, uses protective film in the outer surface of isolation film, can effectively prevent
The coating shedding of film surface is only isolated or is bonded in the surface of hot-rolling pressure roller, guarantees the quality of negative electrode tab component after heat is compound, mentions
High yield, and protective film can be reused.
In another aspect of this invention, the present invention provides a kind of negative electrode tab components.According to an embodiment of the invention, this is negative
Pole piece component is prepared by mentioned-above method.It, can be with when the negative electrode tab component is applied to Stackable batteries
Preparation efficiency is significantly improved, reduces equipment and human input amount, and can be achieved between the every layer of structure of Stackable batteries obtained
In conjunction with, the shock resistance of battery, anti-vibration, the performances such as safety are substantially improved, and improve product quality.
In another aspect of the invention, the present invention provides a kind of negative electrode tab components.According to an embodiment of the invention, reference
Fig. 4 (wherein, left figure is main view, and right figure is top view), negative electrode tab component A includes: negative electrode tab 10；Isolation film 20, it is described
Isolation film 20 is adsorbed in the upper and lower surfaces of the negative electrode tab 10, and in the longitudinal direction, and the two of the isolation film 20
End is aligned with the both ends of the negative electrode tab 10 respectively.When the negative electrode tab component is applied to Stackable batteries, it can significantly improve
Preparation efficiency reduces equipment and human input amount, and can be achieved to combine between the every layer of structure of Stackable batteries obtained, battery
Shock resistance, anti-vibration, safety etc. performances be substantially improved, improve product quality.
According to some embodiments of the present invention, the bonding force between the isolation film and the negative electrode tab is 1.0N/m-
9.0N/m (such as 1.0N/m, 2.0N/m, 3.0N/m, 4.0N/m, 5.0N/m, 6.0N/m, 7.0N/m, 8.0N/m, 9.0N/m).According to
Other embodiments of the invention, bonding force between the isolation film and the negative electrode tab be 5.0N/m-9.0N/m (such as
5.5N/m,6.0N/m,6.5N/m,7.0N/m,7.5N/m,8.0N/m,8.5N/m,9.0N/m).It is adopted thus, it is possible to greatly improve
With the shock resistance of the battery of the negative electrode tab component, anti-vibration, the performances such as safety avoid occurring to misplace and cause to occur when in use
It is dangerous.
In still another aspect of the invention, the present invention provides a kind of methods for preparing battery.According to an embodiment of the invention,
Referring to Fig. 5, this method comprises:
S10: negative electrode tab component is prepared using mentioned-above method.
The step of negative electrode tab component is prepared in the step, parameter, the raw material of use and equipment (negative electrode tab, isolation film, protection
Film, thermal composite machine etc.) be described above consistent, no longer excessively repeat herein.
S20: by multiple negative electrode tab components and multiple positive plates, (structural schematic diagram is referring to Fig. 6, wherein left figure is to bow
View, right figure are main view) it is alternately stacked, it obtains stacking product (structural schematic diagram is referring to Fig. 7), it is described to stack the most upper of product
Layer and lowest level are the negative electrode tab component.
In this step, negative electrode tab component A and positive plate C are arranged alternately according to alternating sequence, the stacking product of acquisition
Middle negative electrode tab 10 and positive plate C are alternately stacked, and two electrode slice of arbitrary neighborhood is different, and between arbitrary neighborhood two panels electrode slice
It is isolated film to separate, top layer and lowest level are the negative electrode tab component A.Specifically, before stacking, negative electrode tab component
It is laminated structure with positive plate, negative electrode tab component and positive plate can be respectively charged into magazine, be then mounted to stack equipment
In stacked, since isolation film is adsorbed on negative electrode tab surface, stacking efficiency can be improved three times or so.
S30: hot pressing is carried out to the stacking product.
In this step, to product progress integral heat pressure is stacked, hot pressing load control system is between 1000kgf-3000kgf
(such as 1000kgf, 1500kgf, 2000kgf, 2500kgf, 3000kgf), hot pressing temperature control (80 between 80 DEG C -110 DEG C
DEG C, 85 DEG C, 90 DEG C, 95 DEG C, 100 DEG C, 105 DEG C, 110 DEG C), hot pressing time control between 15s-120s (such as 15s, 30s,
60s,90s,110s,120s).As a result, when load, temperature, hot pressing time control within the above range, manufactured laminated batteries
In there is preferable bonding force between every layer of positive plate, negative electrode tab and diaphragm, use universal testing machine test diaphragm and positive plate
Or the bonding force between negative electrode tab, preferable bonding force are distributed in 1.0N/m-9.0N/m (such as 1.0N/m, 2.0N/m, 3.0N/
M, 4.0N/m, 5.0N/m, 6.0N/m, 7.0N/m, 8.0N/m, 9.0N/m), the pass of hot pressing load and bonding force during the experiment
System is the most obvious, and in the case where temperature is certain, the raising of hot pressing load will obtain apparent bonding force and improve data.By
Battery after hot pressing has good shock resistance, especially on square aluminum housing battery, by specified in UN38.3
Battery vibration and dependence test, the isolation film of inside battery is Nian Jie between positive plate and negative electrode tab not to misplace securely.
It will be understood by those skilled in the art that obtain the battery product that can directly use, this prepares the method for battery
It can also include connection circuit, packaging and other steps, these steps can be carried out according to routine operation, no longer be retouched one by one herein
It states.
The method and step for preparing battery is simple, easy to operate, easily controllable, obtains and can between each layer structure of battery
It realizes and combines, each layer in use can be effectively reduced and inconsistent phenomenon, the shock resistance of battery, anti-vibration, safety etc. occur
Performance is substantially improved.
In another aspect of this invention, the present invention provides a kind of batteries.According to an embodiment of the invention, the battery includes
It mentioned-above negative electrode tab component or is prepared by mentioned-above method.The battery includes mentioned-above cathode
Whole feature and advantage of piece component and preparation method, this is no longer going to repeat them.
The embodiment of the present invention is described below in detail.In embodiment described below, the negative electrode tab of use, isolation film, just
Pole piece and thermal composite machine are commercial products.
Embodiment 1
Preparation step:
1, referring to process flow shown in Fig. 2, negative electrode tab 10, isolation film 20 and protective film 30 provide as coils,
There is hollow material cup in centre, directly by the assembly of negative electrode tab 10, isolation film 20 and 30 coiled material of protective film on the hanging scroll of thermal composite machine, in
Between be negative electrode tab 10, the two sides of negative electrode tab 10 are followed successively by isolation film 20 and protective film 30 respectively, by negative electrode tab 10,20 and of isolation film
Then protective film 30 while blowing pass through hot calender station 40 (such as hot-rolling pressure furnace), isolation film is adsorbed on negative electrode tab after hot-rolling pressure
Surface, and protective film can be recycled by reel wound to reuse.Wherein, the load of hot-rolling pressure is 2000kgf, temperature 90
DEG C, speed 30m/min.Then, the stepped construction of acquisition is cut according to predetermined size, obtains negative electrode tab component.
2, referring to process shown in fig. 6, negative electrode tab component and positive plate prepared by above-mentioned steps 1 are alternately stacked, then
The stacking product of acquisition is subjected to integral heat pressure, hot pressing load is 2000kgf/cm2, hot pressing temperature is 90 DEG C, and hot pressing time is
80s。
3, the product for preparing step 2 is assembled into rectangular aluminum-shell battery.
Test method:
The vibration of the battery according to specified in UN38.3 and dependence test, test negative electrode tab component stack in product and battery
Bonding force between the isolation film and positive plate and negative electrode tab in portion.Cohesive force numerical value be normal temperature state under using bonding force measuring instrument into
The numerical value of row peel strength test.
Embodiment 2- embodiment 10
Specific preparation step and test method are same as Example 1, and difference is to prepare the hot-rolling pressure of negative electrode tab component
Parameter and the hot compression parameters for stacking product are as shown in table 1.
Table 1
Comparative example 1- comparative example 2
Specific preparation step and test method are consistent with embodiment 1, and difference is, comparative example 1 prepares negative electrode tab component
When protective film is not used to protect, comparative example 2 stack product do not carry out hot pressing.
Test result:
The experimental results showed that relative to comparative example, using the method for preparation negative electrode tab component or battery of the invention, isolation
There is ideal bonding force between film and negative electrode tab and positive plate, can reach 1-9N/m, the especially ginseng to hot-rolling pressure and hot pressing
After number optimizes, such as hot compound load, between 1500kgf-2500kgf, temperature is between 80 DEG C -110 DEG C, speed
Between 15m/min-30m/min, bonding force can arrive 5.5-9N/m；Relative to not by the way of protective film, when hot-rolling is pressed
Using protective film, the integrality of coating is more preferable on isolation film, and the yield of the negative electrode tab component of acquisition is higher, and pressure roller substantially will not
It is contaminated, can long-time continuous production, and reduce cleaning investment, relative to the comparative example 2 for stacking product and not carrying out hot pressing, obtain
A possibility that location dislocation occurs after being assembled into battery for the stacking product obtained is smaller, and the service life of battery and safety are more
It is good.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
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| CN112216872A (en) * | 2019-07-10 | 2021-01-12 | 万向一二三股份公司 | Hot-cold pressing equipment of lithium ion battery and hot pressing method of lithium ion battery |
| CN112652802A (en) * | 2020-12-30 | 2021-04-13 | 蜂巢能源科技有限公司 | Lamination device |
| CN113782820A (en) * | 2021-11-11 | 2021-12-10 | 深圳市兴禾自动化股份有限公司 | Pole piece and pole piece bag coincide electric core |
| CN113782839A (en) * | 2021-11-11 | 2021-12-10 | 深圳市兴禾自动化股份有限公司 | Online pole piece bag making and laminating process and bag making and laminating production line thereof |
| CN113782838A (en) * | 2021-11-11 | 2021-12-10 | 深圳市兴禾自动化股份有限公司 | Cell thermal compounding manufacturing process |
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