CN112928281B - Ear-free cylindrical battery and preparation method thereof - Google Patents
Ear-free cylindrical battery and preparation method thereof Download PDFInfo
- Publication number
- CN112928281B CN112928281B CN202110308202.2A CN202110308202A CN112928281B CN 112928281 B CN112928281 B CN 112928281B CN 202110308202 A CN202110308202 A CN 202110308202A CN 112928281 B CN112928281 B CN 112928281B
- Authority
- CN
- China
- Prior art keywords
- current collector
- composite current
- electrode composite
- negative electrode
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
- H01M10/0422—Cells or battery with cylindrical casing
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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
Landscapes
- 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)
- Composite Materials (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention belongs to the technical field of lithium batteries and battery materials, and discloses a non-polar-lug cylindrical battery and a preparation method thereof. The uncoated region is arranged on one side of the positive electrode composite current collector and the negative electrode composite current collector, and the uncoated region is arranged on the outer side of the diaphragm and is directly connected with the metal shell of the cylindrical battery without connecting a tab, so that the internal resistance of tab welding is avoided, the battery quality is reduced, and the energy density of the battery is improved; meanwhile, the composite current collector intermediate layer is a polymer layer, the upper surface and the lower surface of the composite current collector intermediate layer are respectively plated with a metal layer, the weight is light, the upper layer and the lower layer are not directly conductive, the occurrence of internal short circuit is effectively avoided, and the safety performance of the battery is effectively improved.
Description
Technical Field
The invention belongs to the technical field related to lithium batteries and battery materials, and particularly relates to a non-polar-lug cylindrical battery and a preparation method thereof.
Background
With the current social development and technological progress, lithium ion batteries have been widely used as power sources for portable electronic products such as mobile communication, portable computers, digital cameras, etc., and power storage systems for electric vehicles, due to the significant advantages of both high specific energy and long cycle life, in the existing secondary battery systems. In recent years, high energy density and long driving range are important in the research and development of lithium batteries, but the instability of the electrode material structure due to the high energy density easily causes thermal runaway inside the battery, and further causes the battery to explode, so the development of the battery with both high energy density and high safety performance is an important direction in the lithium battery industry at present.
The current collector in the battery is used as an important component of the battery, the current collector commonly used at present is a thicker copper foil or aluminum foil, and the weight of the current collector accounts for 20-40% of the total weight of the battery, so that the energy density of the battery is reduced; meanwhile, in the existing battery, when a current collector is welded, a tab is adopted for welding, so that not only can the welding resistance between the tab and a metal shell be increased, but also the battery quality can be increased, and the energy density of the battery can be reduced, therefore, a new preparation method needs to be designed to overcome the technical problem urgently.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a preparation method of a lug-free cylindrical battery, which aims to solve the technical problems of battery quality increase, internal resistance increase, current collector quality larger, safety performance not strong enough and the like caused by lug welding in the prior battery manufacturing process.
To achieve the above object, according to one aspect of the present invention, there is provided a method of manufacturing a cylindrical battery without a tab, the method comprising: respectively coating a positive electrode active substance and a negative electrode active substance on a positive electrode composite current collector and a negative electrode composite current collector, and arranging a part of uncoated area on one side of the coating surface, wherein the positive electrode composite current collector and the negative electrode composite current collector comprise three layers, the middle layer is a polymer material layer, and two sides of the polymer material layer are conductive metal material layers; respectively covering the positive electrode active material area and the negative electrode active material area on two sides of the diaphragm, wherein the uncoated area of the positive electrode composite current collector and the uncoated area of the negative electrode composite current collector are positioned outside the diaphragm and are respectively positioned at two ends of the diaphragm; the uncoated region of the positive composite current collector and the uncoated region of the negative composite current collector are connected to the metal case of the cylindrical battery, respectively.
Preferably, the positive electrode composite current collector and the negative electrode composite current collector are coated with a positive electrode active material and a negative electrode active material in an intermittent coating manner, and the width of the gap is the width of the uncoated region.
Preferably, the width of the uncoated region is 5 to 8 mm.
Preferably, the high polymer material is one or a combination of polyethylene, polypropylene, polyimide, polyethylene terephthalate, polyvinylidene fluoride, polyvinyl chloride, polymethyl methacrylate, ethylene-vinyl acetate copolymer, polystyrene and epoxy resin.
Preferably, the thickness of the polymer material layer is 0.5-20 μm.
Preferably, the conductive metal material is an alloy composed of one or more of copper, aluminum, nickel, titanium and silver, and the thickness of the conductive metal material layer is 200-2000 nm.
Preferably, the conductive metal material layer is plated on both sides of the polymer material layer by one of mechanical rolling, glue coating, vapor deposition, and electroplating.
According to another aspect of the present invention, there is provided a cylindrical battery without electrode tab, the battery including: the current collector comprises a positive electrode composite current collector and a negative electrode composite current collector, wherein the positive electrode composite current collector and the negative electrode composite current collector respectively comprise three layers, the middle layer is a polymer material layer, and conductive metal material layers are arranged on two sides of the polymer material layer; the positive electrode composite current collector and the negative electrode composite current collector are respectively positioned on two surfaces of the diaphragm, and partial areas of the positive electrode composite current collector and the negative electrode composite current collector are overlapped with the diaphragm and are not overlapped with the diaphragm; the positive electrode active material is arranged in an overlapping area between the diaphragm and the positive electrode composite current collector, and the negative electrode active material is arranged in an overlapping area between the diaphragm and the negative electrode composite current collector; and the metal shell is arranged on the peripheries of the positive composite current collector and the negative composite current collector and is connected with the non-overlapped area of the diaphragms of the positive composite current collector and the negative composite current collector.
Preferably, the non-overlapping region of the positive electrode composite current collector and the separator and the non-overlapping region of the negative electrode composite current collector and the separator are located at two ends of the separator, respectively.
Generally, compared with the prior art, the above technical scheme of the invention has the following beneficial effects:
1. the positive composite current collector and the negative composite current collector are of a three-layer structure, so that the quality is reduced, the energy density of the battery is improved, the electrical conductivity of metals at two ends of the current collector is reduced due to the reduction of the thickness of the corresponding metal layer, the resistivity is higher than that of a conventional metal foil, the conventional tab welding process is small in conductive area, the resistance of the battery is increased due to two welding spot areas, and the performance of the battery is affected;
2. one end of the tab is required to be welded on the current collector when the existing tab is welded, and the other end of the tab is required to be welded on the metal shell for conducting connection;
3. the conductive metal material layers on the two sides of the positive electrode composite current collector and the negative electrode composite current collector are not directly conductive, and only can be conductive when the two ends are welded, so that the occurrence of short circuit in the battery can be effectively inhibited, the generation of thermal runaway is prevented, and the safety performance of the battery is greatly improved;
4. the high polymer material has wide material selection and low price, reduces the manufacturing cost of the battery, and is very suitable for industrial application;
5. the positive electrode composite current collector and the negative electrode composite current collector are preferably coated in an intermittent manner, the blank leaving positions are located on the left side and the right side of a coating area, the coating area and the blank leaving area are respectively rolled when passing through a roller press, the thicknesses of the two sides are the same, the difference of deformation degrees caused by different pressures is reduced, and the cracking and the belt breakage of the current collectors are avoided.
Drawings
Fig. 1 schematically illustrates a structural schematic view of a positive electrode composite current collector or a negative electrode composite current collector of the present embodiment;
fig. 2 schematically shows a structural view of the positive electrode composite current collector and the negative electrode composite current collector of the present embodiment when wound to prepare a battery;
fig. 3 schematically shows a schematic view of the finished battery of the present embodiment;
fig. 4 shows the charge-discharge impedance of the composite current collector non-tab battery and the composite current collector tab battery in different states of charge.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-a layer of conductive metallic material; 2-a polymer material layer; 3-positive electrode composite current collector; 4-a separator; 5-negative electrode composite current collector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a preparation method of a cylindrical battery without lugs, which does not need to weld the lugs, adopts a light positive electrode composite current collector and a light negative electrode composite current collector, and obviously improves the energy density of the battery. The preparation method comprises the following steps:
s1: respectively coating a positive electrode active substance and a negative electrode active substance on a positive electrode composite current collector and a negative electrode composite current collector, and arranging a part of uncoated area on one side of the coating surface, wherein the positive electrode composite current collector and the negative electrode composite current collector comprise three layers (shown in figure 1), the middle layer is a high polymer material layer 2, and two sides of the high polymer material layer are conductive metal material layers 1;
the material of the polymer material layer 2 may be one or a combination of Polyethylene (PE), polypropylene (PP), Polyimide (PI), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), ethylene-vinyl acetate copolymer (EVA), Polystyrene (PS), and epoxy resin. The thickness of the polymer material layer 2 is preferably 0.5 to 20 μm, and more preferably 1 to 10 μm.
The conductive metal material layer 1 may be made of one or more alloys of copper, aluminum, nickel, titanium, and silver, and the thickness thereof is preferably 200 to 2000nm, and more preferably 500 to 1000 nm.
The conductive metal material layer 1 can be deposited on the surface of the polymer material layer 2 by one or more methods of mechanical rolling, glue coating, vapor deposition, electroplating, and the like, and is preferably a vacuum evaporation method, an electron beam evaporation method, a thermal evaporation method, or a magnetron sputtering method among vapor deposition methods.
When the positive electrode active material and the negative electrode active material are coated on the positive electrode composite current collector 3 and the negative electrode composite current collector 5, respectively, the positive electrode active material and the negative electrode active material are preferably coated in a gap coating manner, and the width of the gap is the width of the uncoated region. The width of the uncoated area is preferably 3-10 mm, and more preferably 5-8 mm.
The existing continuous coating reserves the lug positions at the upper side and the lower side of a coating area, when the coating is finished and the rolling is carried out, because one part of the left side and the right side is a coating area and the other part is a welding lug area with blank, the deformation degree is inconsistent due to different thicknesses of the two sides and different pressure difference during the rolling, and the cracking and the strip breaking of a current collector are easily caused; the blank leaving positions in the gap type coating are positioned on the left side and the right side of the coating area, the coating material area and the blank leaving area are respectively rolled when passing through a roller press, the thicknesses of the two sides are the same, the difference of deformation degrees caused by different pressures is reduced, and the cracking and strip breaking of the current collector are avoided.
S2: respectively covering the positive electrode active material area and the negative electrode active material area on two sides of the diaphragm 4 (as shown in figure 2), wherein the uncoated area of the positive electrode composite current collector 3 and the uncoated area of the negative electrode composite current collector 4 are positioned outside the diaphragm and are respectively positioned at two ends of the diaphragm 4;
the positive electrode active material and the negative electrode active material regions are wound after covering both sides of the separator 4, respectively, and the uncoated regions are exposed from the separator and located at both ends of the separator, respectively, as shown in fig. 2, the uncoated region of the positive electrode composite current collector 3 is located at the upper end, and the uncoated region of the negative electrode composite current collector 5 is located at the lower end.
S3: the uncoated area of the positive composite current collector and the uncoated area of the negative composite current collector were connected to the metal case of the cylindrical battery, respectively, to obtain a finished battery as shown in fig. 3. Preferably laser welding.
Example 1
In this embodiment, the polymer material layer of the positive electrode composite current collector is made of polyvinylidene fluoride (PVDF), and the thickness of the polymer material layer is 3 μm; the conductive metal material layers on the two sides are made of aluminum and have the thickness of 1000 nm. The material of the high polymer material layer of the negative electrode composite current collector is polypropylene (PP); the conductive metal material layers on the two sides are made of copper and have the thickness of 500 nm. And manufacturing the battery by adopting intermittent coating, wherein the width of the uncoated region is 5mm, flattening the uncoated region after winding, and welding the side edge of the uncoated region and the metal shell of the cylindrical battery together by using laser welding. The specific manufacturing steps are as follows:
the method comprises the following steps: winding polyvinylidene fluoride material with coiled material structure as polymer material layer on a roller set in vacuum environment with vacuum degree not more than 10-3Pa, carrying out resistance heating melting evaporation on the aluminum target material to obtain gaseous metal aluminum;
step two: contacting gaseous metal aluminum with one side of polyvinylidene fluoride, and performing rolling evaporation for multiple times through a roller to obtain an evaporation aluminum metal layer with the evaporation thickness of 1000 nm;
step three: after the evaporation of the aluminum metal layer on one side is finished, evaporating an aluminum metal layer with the thickness of 1000nm on the other side of the high polymer material layer in the same way;
step four: preparing a negative electrode composite current collector by adopting the method in the first step to the third step;
step five: respectively carrying out gap type active material coating on the obtained positive electrode composite current collector and negative electrode composite current collector, wherein the width of a gap is 5mm, and then cutting to obtain a positive electrode composite current collector unit and a negative electrode composite current collector unit for preparing the battery;
step six: and arranging the positive electrode composite current collector and the negative electrode composite current collector on two sides of the diaphragm for winding, ensuring that the positive electrode active substance and the negative electrode active substance are contained in the diaphragm during winding, exposing the uncoated part out of the diaphragm, and performing laser welding on the uncoated part and the metal shell of the cylindrical battery after flattening treatment.
Through tests, the internal resistance between the positive electrode and the negative electrode of the cylindrical battery prepared by the method is 103 milliohms, the internal resistance between the positive electrode and the negative electrode of the battery with the composite current collector and the metal shell in welded connection with the lugs is 118 milliohms, the welding internal resistance is effectively reduced by the welding process without the lugs, the quality of the battery is reduced by 13 percent compared with the quality of the battery manufactured by welding the lugs with the conventional metal foil after the finished battery is assembled, and the energy density of the battery is greatly improved.
Example 2
In this embodiment, the polymer material layer of the positive electrode composite current collector is made of polyethylene terephthalate (PET), and the thickness of the polymer material layer is 6 μm; the conductive metal material layers on the two sides are made of aluminum-silver alloy, and the thickness of the conductive metal material layers is 800 nm. The material of the high polymer material layer of the negative electrode composite current collector is Polyimide (PI); the conductive metal material layers on the two sides are made of copper and nickel, and the thickness of the conductive metal material layers is 400 m. And manufacturing the battery by adopting intermittent coating, wherein the width of the uncoated region is 6mm, flattening the uncoated region after winding, and welding the side edge of the uncoated region and the metal shell of the cylindrical battery together by using laser welding. The specific manufacturing steps are as follows:
the method comprises the following steps: taking polyethylene terephthalate material with a coiled material structure as a high polymer material layer, winding the high polymer material layer on a roller, wherein the roller is arranged in a vacuum environment, and the vacuum degree is less than or equal to 10-3Pa, carrying out electron beam heating melting evaporation on the aluminum silver target material to obtain gaseous metal;
step two: the gaseous metal aluminum silver is contacted with one side of the polyethylene glycol terephthalate material, and the vapor plating is carried out for a plurality of times through rolling back and forth by a roller, so as to obtain a metal layer with the vapor plating thickness of 800 nm;
step three: after the metal layer on one side is evaporated, an aluminum silver metal layer with the thickness of 800nm is evaporated on the other side of the high polymer material by using the same method;
step four: preparing a negative electrode composite current collector by adopting the method in the first step to the third step;
step five: respectively carrying out gap type active material coating on the obtained positive electrode composite current collector and negative electrode composite current collector, wherein the width of a gap is 6mm, and then cutting to obtain a positive electrode composite current collector unit and a negative electrode composite current collector unit for preparing the battery;
step six: and arranging the positive electrode composite current collector and the negative electrode composite current collector on two sides of the diaphragm for winding, ensuring that the positive electrode active substance and the negative electrode active substance are contained in the diaphragm during winding, exposing the uncoated part out of the diaphragm, and performing laser welding on the uncoated part and the cylindrical battery metal shell after flattening treatment.
Through tests, the internal resistance impedance between the positive electrode and the negative electrode of the cylindrical battery prepared by the electrode-less-lug method is 89 milliohms, the internal resistance between the positive electrode and the negative electrode of the battery with the electrode lugs welded and connected with the composite current collector and the metal shell is 106 milliohms, and the welding internal resistance impedance is effectively reduced by the electrode-less-lug welding process; as shown in FIG. 4, the impedance of the cylindrical battery prepared by the ear-free method is significantly lower than that of the cylindrical battery with the ear when the cylindrical battery is charged and discharged, and the cylindrical battery has good safety. After the finished battery is assembled, compared with the battery made of the conventional metal foil by adopting the tab welding, the battery quality is reduced by 11%, and the energy density of the battery is greatly improved.
This application another aspect provides an electrodeless ear cylinder battery, the battery includes:
the current collector comprises a positive electrode composite current collector and a negative electrode composite current collector, wherein the positive electrode composite current collector and the negative electrode composite current collector respectively comprise three layers, the middle layer is a polymer material layer, and conductive metal material layers are arranged on two sides of the polymer material layer;
the positive electrode composite current collector and the negative electrode composite current collector are respectively positioned on two surfaces of the diaphragm, and partial areas of the positive electrode composite current collector and the negative electrode composite current collector are overlapped with the diaphragm, and the partial areas of the positive electrode composite current collector and the negative electrode composite current collector are not overlapped with the diaphragm; the non-overlapped area of the positive electrode composite current collector and the diaphragm and the non-overlapped area of the negative electrode composite current collector and the diaphragm are respectively positioned at two ends of the diaphragm;
the positive electrode active material is arranged in an overlapping area between the diaphragm and the positive electrode composite current collector, and the negative electrode active material is arranged in an overlapping area between the diaphragm and the negative electrode composite current collector;
and the metal shell is arranged on the peripheries of the positive composite current collector and the negative composite current collector and is connected with the non-overlapped area of the diaphragms of the positive composite current collector and the negative composite current collector.
The utility model provides a anodal composite current collector and the compound mass flow of negative pole are compared with the mass flow body of conventional metal foil, there is the quality light, advantage such as low price, but the reduction of metallic layer thickness makes mass flow body both ends metal conductivity reduce, the resistivity is greater than conventional metal foil, according to normal utmost point ear welding process, utmost point ear welds with the compound mass flow body of anodal composite current collector and metal casing respectively and another utmost point ear respectively with the compound mass flow body of negative pole and metal casing, it is regional that electrically conductive is utmost point ear and the compound mass flow body of anodal composite current collector or the welding region of the compound mass flow body of negative pole and metal casing, not only electrically conductive region is little, still two solder joint regions lead to the battery resistance increase, influence battery performance. Therefore, when the positive composite current collector or the negative composite current collector is subjected to the cylindrical battery tab-free welding, the positive composite current collector or the negative composite current collector is subjected to the girth welding with the metal shell, the internal resistance of the battery is effectively reduced, and the problem of poor resistance of the positive composite current collector and the negative composite current collector can be well solved.
And for the battery, the battery safety problem is particularly important, once the cylindrical battery has the safety problems such as internal short circuit and the like, the gas generated by thermal runaway of the battery and high temperature can cause the metal shell of the cylindrical battery to explode to generate serious safety accidents when the limit is reached. Consequently, choose for use in the cylinder battery that the anodal composite current collector and the negative pole composite current collector in this application replace ordinary metal foil mass flow body, the composite current collector itself lower floor metal layer is thinner, only conducts electricity through the weld zone, and the resistivity is great to effective circuit break when short circuit including middle macromolecular material layer can effectively avoid the thermal runaway safety problem that the short circuit caused in the battery. The high energy density that lithium ion battery pursued is often accompanied with more safety problem, and uses the anodal composite mass collector and the negative pole composite mass collector in this application and compares with ordinary metal foil mass collector, thickness and quality reduce greatly, can effectively promote the mass energy density and the volume energy density of battery to there is better security performance.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A preparation method of a non-polar ear cylindrical battery is characterized by comprising the following steps:
respectively coating a positive electrode active substance and a negative electrode active substance on a positive electrode composite current collector and a negative electrode composite current collector, and arranging a part of uncoated area on one side of the coating surface, wherein the positive electrode composite current collector and the negative electrode composite current collector comprise three layers, the middle layer is a polymer material layer, and two sides of the polymer material layer are conductive metal material layers;
respectively covering the two sides of a diaphragm with a positive electrode active material area and a negative electrode active material area, wherein the uncoated area of a positive electrode composite current collector and the uncoated area of a negative electrode composite current collector are positioned outside the diaphragm and at the two ends of the diaphragm respectively, the positive electrode composite current collector and the negative electrode composite current collector are coated with the positive electrode active material and the negative electrode active material in a gap type coating mode, and the width of a gap is the width of the uncoated area;
and respectively connecting the uncoated region of the positive composite current collector and the uncoated region of the negative composite current collector with the metal shell of the cylindrical battery, and performing girth welding on the positive composite current collector or the negative composite current collector and the metal shell.
2. The preparation method according to claim 1, wherein the polymer material is one or a combination of polyethylene, polypropylene, polyimide, polyethylene terephthalate, polyvinylidene fluoride, polyvinyl chloride, polymethyl methacrylate, ethylene-vinyl acetate copolymer, polystyrene and epoxy resin, and the thickness of the polymer material layer is 0.5-20 μm.
3. The preparation method according to claim 1, wherein the conductive metal material is an alloy consisting of one or more of copper, aluminum, nickel, titanium and silver, and the thickness of the conductive metal material layer is 200-2000 nm.
4. The method according to claim 1, wherein the conductive metal material layer is plated on both sides of the polymer material layer by one of mechanical rolling, glue coating, vapor deposition, and electroplating.
5. A cylindrical battery without a tab prepared by the method for preparing a cylindrical battery without a tab of any one of claims 1 to 4.
6. The electrodeless ear cylindrical cell as defined in claim 5, wherein the cell comprises:
the current collector comprises a positive electrode composite current collector and a negative electrode composite current collector, wherein the positive electrode composite current collector and the negative electrode composite current collector respectively comprise three layers, the middle layer is a polymer material layer, and conductive metal material layers are arranged on two sides of the polymer material layer;
the positive electrode composite current collector and the negative electrode composite current collector are respectively positioned on two surfaces of the diaphragm, and both have one end area overlapped with the diaphragm and the other end area not overlapped with the diaphragm;
the positive electrode active material is arranged in an overlapping area between the diaphragm and the positive electrode composite current collector, and the negative electrode active material is arranged in an overlapping area between the diaphragm and the negative electrode composite current collector;
and the metal shell is arranged on the peripheries of the positive composite current collector and the negative composite current collector and is connected with the non-overlapped area of the diaphragms of the positive composite current collector and the negative composite current collector.
7. The electrodeless ear cylindrical battery as defined in claim 6, wherein the non-overlapping area of the positive electrode composite current collector and the separator and the non-overlapping area of the negative electrode composite current collector and the separator are respectively located at both ends of the separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110308202.2A CN112928281B (en) | 2021-03-23 | 2021-03-23 | Ear-free cylindrical battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110308202.2A CN112928281B (en) | 2021-03-23 | 2021-03-23 | Ear-free cylindrical battery and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112928281A CN112928281A (en) | 2021-06-08 |
| CN112928281B true CN112928281B (en) | 2022-07-05 |
Family
ID=76175605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110308202.2A Active CN112928281B (en) | 2021-03-23 | 2021-03-23 | Ear-free cylindrical battery and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112928281B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114171718B (en) * | 2021-11-01 | 2024-03-19 | 浙江锋锂新能源科技有限公司 | Pole piece preparation method of composite foil current collector, pole piece and soft package battery |
| CN114374000A (en) * | 2022-01-12 | 2022-04-19 | 江苏正力新能电池技术有限公司 | Battery and energy storage device |
| CN114709423A (en) * | 2022-03-30 | 2022-07-05 | 清华大学 | Composite current collector, battery cell structure and lithium ion battery |
| CN115360480A (en) * | 2022-08-24 | 2022-11-18 | 江苏正力新能电池技术有限公司 | Low-internal-resistance battery cell and secondary battery |
| CN116031412A (en) * | 2023-02-27 | 2023-04-28 | 华中科技大学 | Memory composite current collector and preparation method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202150519U (en) * | 2011-03-23 | 2012-02-22 | 上海卡能迪蓄能科技有限公司 | Lithium ion secondary battery without polar ears |
| CN105449291A (en) * | 2015-04-16 | 2016-03-30 | 东莞市创明电池技术有限公司 | Preparation method of cylindrical battery free of tab welding |
| CN107221676A (en) * | 2017-06-30 | 2017-09-29 | 江苏道赢科技有限公司 | A kind of lithium rechargeable battery of composite current collector and the application collector |
| CN110943215A (en) * | 2019-05-31 | 2020-03-31 | 宁德时代新能源科技股份有限公司 | Lithium ion secondary battery |
| CN111180738A (en) * | 2019-06-28 | 2020-05-19 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN111883777A (en) * | 2020-07-28 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Composite current collector, preparation method thereof and lithium battery pole piece |
| CN111900413A (en) * | 2020-08-11 | 2020-11-06 | 珠海冠宇电池股份有限公司 | Current collector and preparation method and application thereof |
| CN112234210A (en) * | 2020-09-30 | 2021-01-15 | 江苏卓高新材料科技有限公司 | Composite current collector, preparation method thereof and battery |
| CN112349949A (en) * | 2020-12-05 | 2021-02-09 | 天津赢慧科技咨询服务有限公司 | Battery welded without electrode lug and preparation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204834764U (en) * | 2015-06-17 | 2015-12-02 | 深圳市沃特玛电池有限公司 | Cylindrical high magnification lithium ion battery of edge weld |
-
2021
- 2021-03-23 CN CN202110308202.2A patent/CN112928281B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202150519U (en) * | 2011-03-23 | 2012-02-22 | 上海卡能迪蓄能科技有限公司 | Lithium ion secondary battery without polar ears |
| CN105449291A (en) * | 2015-04-16 | 2016-03-30 | 东莞市创明电池技术有限公司 | Preparation method of cylindrical battery free of tab welding |
| CN107221676A (en) * | 2017-06-30 | 2017-09-29 | 江苏道赢科技有限公司 | A kind of lithium rechargeable battery of composite current collector and the application collector |
| CN110943215A (en) * | 2019-05-31 | 2020-03-31 | 宁德时代新能源科技股份有限公司 | Lithium ion secondary battery |
| CN111180738A (en) * | 2019-06-28 | 2020-05-19 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN111883777A (en) * | 2020-07-28 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Composite current collector, preparation method thereof and lithium battery pole piece |
| CN111900413A (en) * | 2020-08-11 | 2020-11-06 | 珠海冠宇电池股份有限公司 | Current collector and preparation method and application thereof |
| CN112234210A (en) * | 2020-09-30 | 2021-01-15 | 江苏卓高新材料科技有限公司 | Composite current collector, preparation method thereof and battery |
| CN112349949A (en) * | 2020-12-05 | 2021-02-09 | 天津赢慧科技咨询服务有限公司 | Battery welded without electrode lug and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112928281A (en) | 2021-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112928281B (en) | Ear-free cylindrical battery and preparation method thereof | |
| US20230253631A1 (en) | Cylindrical Electrochemical Cells and Method of Manufacture | |
| CN110061182B (en) | Battery pole piece and battery core | |
| US11456513B2 (en) | Battery and method for producing the same | |
| JP6249493B2 (en) | Non-aqueous electrolyte secondary battery | |
| EP1076371B1 (en) | Nonaqueous electrolyte secondary cells and process for fabricating same | |
| EP2869385B1 (en) | Electrode assembly, fabricating method of the electrode assembly, and electrochemial cell containing the electrode assembly | |
| CN111584823B (en) | Pole piece, battery core and battery | |
| EP2757625B1 (en) | Method for manufacturing electrode assembly and electrochemical device | |
| EP3832764A1 (en) | Current collector for electrode | |
| EP3907819B1 (en) | Secondary battery | |
| JP4538694B2 (en) | Electrode wound type battery | |
| WO2019073914A1 (en) | Secondary battery and method for manufacturing secondary battery | |
| CN112054236A (en) | Storage battery and manufacturing method thereof | |
| CN112968207A (en) | Composite battery | |
| CN112510244A (en) | Electrode lug shaping and welding method of full-electrode-lug cylindrical winding core and full-electrode-lug cylindrical winding core formed by same | |
| JP7394051B2 (en) | Battery and its manufacturing method | |
| CN114335407A (en) | Pole piece and battery | |
| CN217933932U (en) | Battery cell structure and battery | |
| CN217507393U (en) | Current collector and lithium ion battery | |
| CN116706448A (en) | Method for welding composite current collector and tab | |
| WO2022188893A1 (en) | Battery cell | |
| KR20140022531A (en) | Electrode assembly and fabricating method of electrochemical cell containing the electrode assembly, electrochemical cell | |
| CN215184061U (en) | Current collector-free battery core and energy storage device | |
| CN114050229A (en) | Pole piece and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |