CN105390628A - Electrochemical cell and preparation method thereof - Google Patents
Electrochemical cell and preparation method thereof Download PDFInfo
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- CN105390628A CN105390628A CN201510715948.XA CN201510715948A CN105390628A CN 105390628 A CN105390628 A CN 105390628A CN 201510715948 A CN201510715948 A CN 201510715948A CN 105390628 A CN105390628 A CN 105390628A
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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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
- H01M4/04—Processes of manufacture in general
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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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
Abstract
The invention belongs to the technical field of flexible devices, and particularly relates to an electrochemical cell which comprises a positive electrode, an isolating membrane, a negative electrode, an electrolyte and an outer packaging structure; the sum n of the number of the positive electrodes and the number of the negative electrodes is an even number; the outer packaging structure at least comprises a positive current collector a or/and a negative current collector b; the external packaging structure is respectively a positive electrode lug and a negative electrode lug of the battery cell. The outermost electrode current collector serves as a packaging material of the battery and a battery tab, so that the material type and the material consumption are reduced, and the material cost is reduced; meanwhile, the energy density of the battery is improved; in the preparation process, only the current collector at the edge of the seal is subjected to packaging auxiliary treatment, so that the problem of packaging reliability can be solved, the treatment cost can be reduced (the using amount of expensive treatment liquid is reduced), and finally the side effect of electrode impedance increase caused by packaging auxiliary treatment can be reduced.
Description
Technical Field
The invention belongs to the technical field of electrochemical cells, and particularly relates to an electrochemical cell and a preparation method thereof.
Background
After the 21 st century, various electronic device products such as mobile phones, notebooks, wearable devices and the like are in endless, and the lives of a large number of users are greatly enriched; meanwhile, electric vehicles and various energy storage power stations can sprout, develop and grow rapidly like spring bamboo shoots in the rainy season. The above high-tech products have one common feature: high performance, low cost batteries are required to serve as energy storage components.
The existing batteries mainly comprise a primary battery and a secondary battery; the so-called primary battery, which is a battery that cannot be repeatedly charged, mainly includes a carbon zinc battery, an alkaline battery, a paste zinc-manganese battery, a cardboard zinc-manganese battery, an alkaline zinc-manganese battery, a button cell (a button zinc-silver battery, a button lithium-manganese battery, a button zinc-manganese battery), a zinc-air battery, a primary lithium-manganese battery, and the like, and a mercury battery; the secondary battery, i.e., a rechargeable battery, mainly includes a secondary alkaline zinc-manganese battery, a nickel-cadmium rechargeable battery, a nickel-hydrogen rechargeable battery, a lithium rechargeable battery, a lead-acid battery, and a solar battery. Lead-acid batteries can be divided into: open type lead-acid storage battery and totally-enclosed lead-acid storage battery. From the perspective of external packaging, the conventional batteries are mainly classified into flexible-packaged batteries and hard-shell-packaged batteries, and the flexible-packaged battery packaging film has small thickness and large plasticity, so that the battery is widely applied to various high-grade primary batteries and secondary batteries.
However, as the quality of life of people improves, higher requirements, namely longer standby time, are put on electronic products; this requires a higher energy density of the power supply that powers the electronic product.
The existing ways to increase the energy density are: selecting an electrochemical system with higher energy density, such as a high-voltage lithium cobaltate anode, a silicon cathode and the like; a manufacturing process with higher precision is selected, and the consistency of the battery capacity is improved, so that the average capacity of the battery is improved; the substrate with a thinner thickness is selected, such as 6 μm copper foil, 8 μm aluminum foil, 64 μm aluminum plastic film, etc. But the high-voltage system has poorer safety performance and higher cost; the silicon cathode has low first efficiency, poor cycle performance and high cost; the high-precision manufacturing process has huge equipment investment and high manufacturing cost; thinner substrates, in turn, tend to mean higher process control requirements, higher material costs; none of these solutions therefore increases the manufacturing costs.
With the increase of personalized electronic products, such as the horizontal emergence of flexible devices, it puts higher requirements on batteries: i.e. a flexible battery. However, in the bending process of the flexible battery, the interface inside the battery cell is often a weak link and is easily damaged, so that the performance of the flexible battery is poor; therefore, the number of internal interfaces of the flexible battery is reduced as much as possible, and the method is a reliable method for improving the performance of the flexible battery.
Meanwhile, in order to pursue higher energy density, the width of an effective packaging area is often reduced in the manufacturing process; and new materials and new battery structures are continuously generated, and higher requirements on the packaging reliability of the battery are also put forward.
In view of the above, there is a need for a new electrochemical cell and a method for manufacturing the same, which not only can increase the energy density of the cell, improve the packaging reliability of the cell, reduce the cost (material cost or/and manufacturing cost), but also have excellent flexibility and electrochemical performance when it is a flexible cell.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the provided electrochemical cell comprises a positive electrode, a separation film, a negative electrode, an electrolyte and an outer packaging structure; the positive electrode consists of a positive current collector and a positive coating layer; the negative electrode consists of a negative current collector and a negative coating layer; the assembling process of the electrochemical cell comprises a lamination process, and the sum n of the number of the positive electrodes and the number of the negative electrodes is an even number; the outer packaging structure at least comprises a positive current collector a or/and a negative current collector b; the external packaging structure is respectively a positive electrode lug and a negative electrode lug of the battery cell. The outermost electrode current collector serves as a packaging material of the battery and a battery tab, so that the material type and the material consumption are reduced, and the material cost is reduced; meanwhile, the energy density of the battery is improved; in the preparation process, only the current collector at the edge of the seal is subjected to packaging auxiliary treatment, so that the problem of packaging reliability can be solved, the treatment cost can be reduced (the using amount of expensive treatment liquid is reduced), and finally the side effect of electrode impedance increase caused by packaging auxiliary treatment can be reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electrochemical cell comprises a positive electrode, a separation film, a negative electrode, electrolyte and an outer packaging structure; the positive electrode consists of a positive current collector and a positive coating layer; the negative electrode consists of a negative current collector and a negative coating layer; the assembling process of the electrochemical cell comprises a lamination process, and the sum n of the number of the positive electrodes and the number of the negative electrodes is an even number; the outer packaging structure at least comprises a positive current collector a or/and a negative current collector b; the external packaging structure is respectively a positive electrode lug and a negative electrode lug of the battery cell; the positive current collector a is subjected to packaging auxiliary treatment or/and the negative current collector b is subjected to packaging auxiliary treatment, the thickness of a packaging auxiliary treatment layer is h, and h is less than or equal to 10 micrometers; the thickness of the positive electrode current collector a is greater than or equal to 12 microns, and the thickness of the negative electrode current collector b is greater than or equal to 10 microns. As the current collector of the packaging material, the thickness of the current collector must reach a certain value, and then the situation that the material has no perforation can be ensured, and the packaging reliability is ensured.
As an improvement of the electrochemical cell of the present invention, the sum n of the number of the positive electrode sheets and the number of the negative electrode sheets is an even number greater than or equal to 4; the external packaging structure comprises a positive current collector a and a negative current collector b, the positive current collector a and the negative current collector b serving as the external packaging structure are coated on one side, and the positive current collector a and the negative current collector b serving as the external packaging structure are positioned on the outermost side of the battery; and the outer sides of the positive current collector a and the negative current collector b serving as the outer packaging structure are provided with a first insulating layer (namely, the electrode is positioned on the side, which is not coated with the electrode material, of the current collector on the surface of the battery core), so that the outer surface of the battery is ensured to be insulated from the atmosphere and the ground, and the self-discharge speed of the battery is reduced.
As an improvement of the electrochemical cell of the present invention, the electrode located between the outer packaging structures is a double-sided coated electrode, the double-sided coated electrode comprises a current collector and two electrode coatings respectively arranged on two sides of the current collector, and the current collector is a current collector which is not subjected to packaging auxiliary treatment or a current collector which is subjected to packaging auxiliary treatment; the electrodes on the two sides of the isolating membrane are matched electrodes during assembly; the outer packaging structure comprises a water-resisting layer and a sealing layer, the water-resisting layer is the current collector which is used as the outer packaging structure, the sealing layer is arranged on the inner side surface of the water-resisting layer (namely the sealing layer and the first insulating layer are respectively distributed on the inner side and the outer side of the water-resisting layer (current collector)), the sealing layer is of a three-layer structure and is respectively a first bonding layer, a second insulating layer and a second bonding layer; the first bonding layer bonds the insulating layer and the water-resisting layer together.
The waterproof layer is the current collector used as the packaging material, and the sealing layer is of a three-layer structure and is respectively an adhesive layer, an insulating layer and an adhesive layer; the bonding layer bonds the insulating layer and the waterproof layer together to achieve a sealing effect, the insulating layer can effectively prevent short circuit of an outer packaging material serving as a current collector at a packaging position, and the self-discharge rate of the battery is reduced.
As an improvement of the electrochemical cell, all the positive plates and the positive current collector a serving as the outer packaging structure are connected together with the positive current collector a serving as the packaging structure in a welding or/and conductive adhesive bonding mode; and all the negative plates and the negative current collector b serving as the outer packaging structure are connected together in a welding or/and conductive adhesive bonding mode. The current collector serving as the packaging material simultaneously serves as a battery tab, so that the material consumption can be reduced, the material cost is reduced, the battery structure is simplified, and the structural stability of the battery is improved.
As an improvement of the electrochemical cell of the invention, the positive current collector has a thickness greater than or equal to 20 μm and is composed of gold, silver, copper, iron, tin, zinc, lead, nickel, aluminum, tungsten, molybdenum, tantalum, niobium, titanium, and at least one of steel and stainless steel, nickel-based and cobalt-based alloys; the thickness of the negative current collector is more than or equal to 15 mu m, and the negative current collector consists of gold, silver, copper, iron, tin, zinc, lead, nickel, aluminum, tungsten, molybdenum, tantalum, niobium, titanium and at least one of steel and stainless steel, nickel-based alloy and cobalt-based alloy; the positive electrode coating layer contains a positive electrode active substance, and is distributed on only one surface of the positive electrode current collector in the positive electrode serving as an external packaging structure; the negative electrode coating contains a negative active material, and is used as the negative electrode of the external packaging structure, and the negative coating layer is only distributed on one surface of the negative current collector; the positive active material includes at least one of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron oxide, lithium vanadium oxide, sulfur or sulfide, ternary or multicomponent complex compound, and polyanion cathode material; the negative electrode active material includes at least one of a carbon material, a carbonaceous compound, and a non-carbon material.
As an improvement of the electrochemical cell of the invention, the thickness h of the packaging auxiliary treatment layer is less than or equal to 5 μm, and the packaging auxiliary treatment layer is at least distributed in the packaging area of the cell; the packaging auxiliary treatment comprises at least one of polishing treatment, plating treatment (electroplating or chemical plating), organic silicon treatment or anodic oxidation (as the gap area of the current collector serves as the packaging edge of the battery and serves as the packaging edge, the packaging reliability is a basic requirement, and the current collector cannot be tightly adhered to a packaging material and passes an electrolyte soaking test (the packaging part is soaked in electrolyte, a sample is taken out after a certain time, the packaging tension is tested, when the packaging tension is more than or equal to 5N/8mm, the test is passed, otherwise, the test is not passed, which is a necessary test item for the packaging reliability test)).
As an improvement of the electrochemical cell of the present invention, the polishing treatment includes a mechanical polishing treatment or/and a chemical polishing treatment; the electroplating treatment comprises at least one of zinc plating treatment, copper plating treatment, chromium plating treatment, lead plating treatment, silver plating treatment, nickel plating treatment, tin plating treatment or cadmium plating treatment; the organosilicon treatment includes at least one of a silane coupling agent (vinyltrichlorosilane, vinyltriethoxysilane, vinyltris (beta-methoxyethoxy) silane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl-methyl-trimethoxysilane, gamma-chloropropyl-trimethoxysilane, gamma-mercaptopropyl-trimethoxysilane, gamma-aminopropyl-trimethoxysilane, and the like), a silane crosslinking agent (methyltriacetoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, and the like), a silicon resin (methylphenylsilicone, chlorophenylmethylsilicone, methyltrifluoropropylsilicon, acrylic-modified resins, and the like), or a polysiloxane (carboxyterminal-blocked diorganopolysiloxane, terminal alkoxy-blocked diorganopolysiloxane, and the like).
The invention also comprises a preparation method of the electrochemical cell, which comprises the following steps:
step 1, preparing electrode slurry: uniformly stirring the positive active substance, a conductive agent, an adhesive and a solvent to obtain positive slurry for later use; uniformly stirring the negative active material, a conductive agent, a bonding agent and a solvent to obtain negative slurry for later use;
and 2, performing current collector packaging auxiliary treatment: performing packaging auxiliary treatment on the positive current collector by adopting a packaging auxiliary treatment process, so that a packaging auxiliary treatment layer with the thickness h less than or equal to 10 mu m is attached to the surface of the positive current collector, and thus obtaining a positive current collector a subjected to packaging auxiliary treatment for later use; performing packaging auxiliary treatment on the negative current collector by adopting a packaging auxiliary treatment process, so that a packaging auxiliary treatment layer with the thickness h less than or equal to 10 micrometers is attached to the surface of the negative current collector, and thus obtaining a negative current collector b subjected to packaging auxiliary treatment for later use;
step 3, preparing an electrode serving as a packaging structure: coating the positive electrode slurry obtained in the step (1) on the positive electrode current collector a obtained in the step (2), drying and processing to obtain a single-surface coated positive electrode with a coating area of length L, width d and area S, wherein the periphery of the coating is also provided with a hollow foil area for standby; coating the negative electrode slurry obtained in the step (1) on the negative electrode current collector b obtained in the step (2), drying and processing to obtain a single-surface coated negative electrode with a coating area of length L, width d and area S, wherein the periphery of the coating also contains a hollow foil area for later use;
step 4, preparing a double-sided electrode: coating the positive electrode slurry obtained in the step (1) on two sides of a positive electrode current collector, drying and cutting to obtain a double-coated positive electrode for later use; coating the negative electrode slurry obtained in the step (1) on two sides of a negative electrode current collector, drying and cutting to obtain a double-coated negative electrode for later use;
step 5, assembling the battery cell: stacking the anode obtained in the step (3), the isolating film, the cathode electrode obtained in the step (4), the isolating film, the anode electrode obtained in the step (4), the isolating film, the cathode electrode … … obtained in the step (4), the anode electrode obtained in the step (4), the isolating film and the cathode electrode obtained in the step (3) in sequence to obtain a bare cell, wherein the total number of stacked electrodes is more than or equal to 4; welding or/and gluing all positive electrodes in the bare cell on the empty foil area of the positive electrode current collector a in the step 3, and welding or/and gluing all negative electrodes on the empty foil area of the negative electrode current collector b in the step 3;
step 6, preparing a finished product battery core: and (5) packaging, injecting, forming, shaping and slitting the battery core assembled in the step (5) to obtain a single finished electrochemical battery.
As an improvement of the preparation method of the electrochemical cell, the thickness h of the packaging auxiliary treatment layer in the step 2 is less than or equal to 5 microns; the packaging auxiliary treatment comprises at least one of polishing treatment, plating treatment (electroplating or chemical plating), organosilicon treatment or anodic oxidation; the method for preparing the single-side coating area and the gaps thereof comprises the steps of intermittently coating (a comb-shaped grid is used, a coating cutter head is divided, the grid width of the grid is d, the grid width of the grid is m, then coating operation is carried out, slurry obtained in the step 1 is coated on a current collector to obtain an initial membrane, in order to enable the coating length and the absolute value of the coating gap to be smaller and accurately controlled, the control precision of equipment needs to be optimized, the coating speed needs to be adjusted, solvent cleaning is carried out (after continuous coating, a coating layer is partially removed by using a solvent to obtain a gap area meeting the specification requirement), laser cleaning is carried out (after continuous coating, a coating layer is partially removed by using a laser ablation technology to obtain a gap area meeting the specification requirement), an auxiliary layer is stripped (namely, an auxiliary layer is preset in the coating gap area, and then after continuous coating, the auxiliary layer and the current collector are separated by adopting a special means to achieve the purpose of removing the residual coating to obtain the gap area, for example, a layer is preset in the gap area on the current collector, then continuous coating is continuously coated, a hot melt adhesive layer is removed by a heating mode, and at the same time, the hot melt adhesive layer covered on the surface is removed, so as the gap area meeting the requirement is obtained.
As an improvement of the electrochemical cell preparation method of the present invention, the current collector encapsulation auxiliary treatment manner in step 2 includes printing treatment or/and soaking treatment, the printing treatment refers to pre-disposing a treatment fluid on a template corresponding to the current collector coating empty foil area, and only treating the coating empty foil area as an encapsulation area, the soaking treatment refers to soaking the current collector in the treatment fluid or/and passing the treatment fluid, and treating the entire current collector; before the encapsulation in step 5, a sealing layer is required to be arranged at a position corresponding to the seal, where the sealing layer includes at least one of polyethylene, polypropylene, modified polyethylene, modified polypropylene, hot melt adhesive, and reactive hot melt adhesive (the bonding layer is required to bond the two electrodes together tightly, so as to achieve a reliable encapsulation effect, and also to perform an electronic blocking function and prevent a short circuit between the two electrodes).
Compared with the prior art, the electrochemical cell and the preparation method thereof have the following advantages:
1. the outermost electrode current collector serves as a packaging material of the battery and the tab function of two electrodes, so that the material types and the material consumption are reduced, and the material cost is reduced; meanwhile, the energy density of the battery is improved;
2. in the battery structure, only the current collector at the edge of the seal is subjected to packaging auxiliary treatment, so that the problem of packaging reliability can be solved, and the side effect of electrode impedance increase caused by the packaging auxiliary treatment can be reduced;
3. during the auxiliary processing of the packaging, a printing processing mode is adopted, and only the area of the current collector serving as the packaging material, which corresponds to the sealing area, is processed, so that the processing area is greatly reduced, the using amount of expensive processing liquid is reduced, and the processing cost is reduced.
4. The sealing layer is of a three-layer structure consisting of the bonding layer, the insulating layer and the bonding layer, can effectively play a role in sealing, simultaneously blocks a sealing area from being used as a short circuit of a positive current collector and a negative current collector of a packaging material, and improves the self-discharge performance of the battery core.
Drawings
FIG. 1 is a schematic cross-sectional view of an electrochemical cell of the present invention.
Fig. 2 is a schematic (more detailed) cross-sectional structure of an electrochemical cell of the present invention.
Detailed Description
The present invention and its advantageous effects will be described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.
Comparative example
Preparing an electrode plate: uniformly stirring lithium cobaltate serving as a positive electrode active substance, PVDF (polyvinylidene fluoride) serving as a bonding agent and NMP (N-methyl pyrrolidone) serving as a conductive agent, coating the mixture on an aluminum foil with the thickness of 10 mu m, cold-pressing and cutting the mixture, and cutting a tab to obtain a positive plate to be laminated; graphite is used as a negative active material, SBR and CMC are used as adhesives, super-P is used as a conductive agent, and water is used as a solvent, the mixture is uniformly stirred and coated on a copper foil with the thickness of 8 mu m, and then the copper foil is cold-pressed and cut, and a tab is cut to obtain a negative plate to be laminated.
Preparing a finished battery: and laminating the positive plate, the negative plate and the isolating membrane together to obtain a bare cell, selecting an aluminum plastic membrane with the thickness of 86 mu m as a packaging material to carry out top side sealing, and then drying, injecting liquid, standing, forming, shaping, degassing and packaging to obtain a finished battery.
Example 1
Fig. 1 is a schematic cross-sectional structure diagram of an electrochemical cell corresponding to this embodiment, which can be obtained from the figure, in which a negative electrode coating 02 is coated on one surface of a negative electrode current collector 01A serving as a packaging material, and then laminated with an isolating film 03 and a double-coated positive plate 04 to obtain a total of four layers of electrodes (two negative electrodes and two positive electrodes, one of the two negative electrodes is coated on one side and one of the two positive plates is coated on both sides), the positive plate is welded with a current collector 05A through a current collector slitting tab 05B, the current collectors 01A and 05A are water-blocking layers in a packaging structure, and the water-blocking layers 01A and 05A are bonded together by a sealing layer of a three-layer structure (including two bonding layers 07 and an insulating layer 06 located between the two bonding layers) to seal and prevent a short circuit between the current collectors 01A and 05A at a sealing position, thereby achieving an insulating purpose; meanwhile, the negative plate 08 with double-coated surfaces is welded with the current collector 01A through the current collector 01B. Therefore, the battery with the structure of the invention does not need to additionally arrange a separate tab, and only needs to weld all the negative plates on the single-side coated negative plate current collector serving as the packaging material and weld all the positive plates on the single-side coated positive plate current collector serving as the packaging material, and then the positive and negative plates serving as the packaging material can serve as the positive and negative electrode tabs. Fig. 2 is a more detailed schematic cross-sectional structure diagram of an electrochemical cell corresponding to this embodiment, which includes an insulating layer 09 on the outer side of a current collector as an encapsulation material, and a structure in which the current collector corresponding to the sealing region and only the sealing region includes an encapsulation auxiliary processing layer 10, where the presence of the insulating layer 09 can block the contact between the electrode and the atmosphere and the ground, reduce the self-discharge rate of the cell, and the presence of the encapsulation auxiliary processing layer 10 can effectively improve the encapsulation reliability.
The specific steps for preparing the battery cell are as follows:
preparing electrode slurry: uniformly stirring lithium cobaltate serving as a positive electrode active substance, PVDF (polyvinylidene fluoride) serving as a binder and NMP (N-methyl pyrrolidone) serving as a conductive agent to obtain positive electrode slurry for later use; and uniformly stirring graphite serving as a negative active material, SBR and CMC serving as adhesives, super-P serving as a conductive agent and water serving as a solvent to obtain negative slurry for later use.
And (3) carrying out auxiliary treatment on the packaging of the negative current collector: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a chromium liquid containing bath is arranged on a cross line, the bath width is matched with the seal width (equal to the seal width), then paving a copper foil with the thickness of 30 mu m on the surface of the plating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, dividing the current collector into a plurality of unprocessed current collector small blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain a negative current collector after packaging auxiliary treatment for later use;
and (3) carrying out auxiliary treatment on the packaging of the positive current collector: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a cross line is provided with a chromium liquid containing bath, the width of the bath is matched with the width of a seal (equal to the width of the seal), then paving an aluminum foil with the thickness of 30 mu m on the surface of the plating bath, plating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, cutting a current collector into a plurality of unprocessed current collector small blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by using deionized water to obtain an anode current collector after packaging auxiliary treatment for later use;
preparing a negative electrode serving as a packaging structure: coating the negative electrode slurry on the positive current collector subjected to the packaging auxiliary treatment to obtain a single-side coated electrode plate (the packaging auxiliary treatment layer and the coating are positioned on the same side of the current collector), cleaning the coating on the surface of the packaging auxiliary treatment layer with deionized water, and cutting along the central line of the packaging auxiliary treatment layer to obtain a single-sheet single-side coated negative electrode for later use;
preparing a positive electrode serving as a packaging structure: coating the positive electrode slurry on the positive current collector subjected to the packaging auxiliary treatment to obtain an electrode plate coated on one side (the packaging auxiliary treatment layer and the coating are positioned on the same side of the current collector), cleaning the coating on the surface of the packaging auxiliary treatment layer with deionized water, and cutting along the central line of the packaging auxiliary treatment layer to obtain a single positive electrode coated on one side for later use;
preparing a double-sided electrode: coating the positive electrode on the surface of an aluminum foil with the thickness of 12 mu m to obtain a double-coated positive plate, and cutting the double-coated positive plate for later use; coating the negative electrode slurry on the surface of a copper foil with the thickness of 8 mu m to obtain a double-sided coated negative plate, and cutting the double-sided coated negative plate for later use;
assembling the battery: drying a negative electrode, a double-sided coated positive plate, a double-sided coated negative plate, a positive electrode and an isolating membrane, then spraying electrolyte on the surface of the electrode, and referring to the schematic diagram 1, laminating the negative electrode, the double-sided coated positive plate, the double-sided coated negative plate, the positive electrode and the isolating membrane to obtain a bare cell, and then welding the double-sided coated positive plate on a current collector of the single-sided coated positive plate serving as a packaging material and welding the double-sided coated negative plate on a current collector of the single-sided coated negative plate serving as the packaging material; and placing a sealant (two layers of modified PP with the melting point of 160 ℃, and a layer of PP with the melting point of 200 ℃ is arranged between the two layers of modified PP with the melting point of 160 ℃) at the corresponding position of the packaging auxiliary treatment layer, performing heat sealing at 180 ℃ to melt the two layers of modified PP with the melting point of 160 ℃, bonding the PP with the melting point of 200 ℃ and two water-resisting layers (namely current collectors serving as packaging materials) together to achieve a sealing effect, forming, shaping and sealing, and then bonding a layer of insulating gummed paper on the surface of the battery core to obtain the finished battery.
Example 2
The difference from the embodiment 1 is that the method comprises the following steps:
and (3) carrying out auxiliary treatment on the packaging of the negative current collector: placing the chromium solution in an electroplating bath, paving a copper foil with the thickness of 30 mu m on the surface of the electroplating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, and then cleaning with deionized water to obtain a negative current collector subjected to packaging auxiliary treatment for later use;
preparing a negative electrode serving as a packaging structure: coating the negative electrode slurry on the negative electrode current collector subjected to the packaging auxiliary treatment to obtain a single-side coated electrode plate, cleaning a coating corresponding to a sealing area by using deionized water, and cutting to obtain a single-sheet single-side coated negative electrode for later use;
and (3) carrying out auxiliary treatment on the packaging of the positive current collector: placing the chromium solution in an electroplating bath, paving an aluminum foil with the thickness of 30 mu m on the surface of the electroplating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, and then cleaning with deionized water to obtain a positive electrode current collector subjected to packaging auxiliary treatment for later use;
preparing a positive electrode serving as a packaging structure: coating the positive electrode slurry on the positive electrode current collector subjected to the packaging auxiliary treatment to obtain an electrode plate coated on one side, cleaning a coating corresponding to a sealing area by using deionized water, and cutting to obtain a single positive electrode coated on one side for later use;
the rest is the same as the embodiment 1, and the description is omitted.
Example 3
The difference from the embodiment 1 is that the method comprises the following steps:
and (3) carrying out auxiliary treatment on the packaging of the negative current collector: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a chromium liquid containing groove is arranged on a cross line, the groove width is matched with the seal width (equal to the seal width)), then paving a copper foil with the thickness of 10 mu m on the surface of the plating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, dividing the current collector into a plurality of unprocessed current collector blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain a negative current collector for standby after packaging auxiliary treatment;
and (3) carrying out auxiliary treatment on the packaging of the positive current collector: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a chromium liquid containing bath is arranged on a cross line, the bath width is matched with the seal width (equal to the seal width), then paving an aluminum foil with the thickness of 12 mu m on the surface of the plating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, dividing the current collector into a plurality of unprocessed current collector small blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain an anode current collector after packaging auxiliary treatment for later use;
the rest is the same as the embodiment 1, and the description is omitted.
Example 4
The difference from the embodiment 1 is that the method comprises the following steps:
and (3) auxiliary treatment of negative current collector packaging: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a cross line is provided with a chromium liquid containing bath, the width of the bath is matched with the width of a seal (equal to the width of the seal)), then spreading a copper foil with the thickness of 15 mu m on the surface of the plating bath, plating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, dividing a current collector into a plurality of unprocessed current collector small blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain a negative current collector subjected to packaging auxiliary treatment for later use;
and (3) carrying out auxiliary treatment on the packaging of the positive current collector: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a chromium liquid containing groove is arranged on a cross line, the groove width is matched with the seal width (equal to the seal width)), then paving an aluminum foil with the thickness of 20 mu m on the surface of the plating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10nm, dividing the current collector into a plurality of unprocessed current collector blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain an anode current collector for standby after packaging auxiliary treatment; the rest is the same as the embodiment 1, and the description is omitted.
Example 5
The difference from the embodiment 4 is that the method comprises the following steps:
and (3) carrying out auxiliary treatment on the packaging of the negative current collector: placing chromium liquid in a plating bath with a fixed structure (the plating bath is a cross-shaped bath, wherein only a chromium liquid containing groove is arranged on a cross line, the groove width is matched with the seal width (equal to the seal width)), then paving a copper foil with the thickness of 40 mu m on the surface of the plating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10 mu m, dividing the current collector into a plurality of unprocessed current collector blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain a negative current collector for standby after packaging auxiliary treatment;
and (3) carrying out auxiliary treatment on the packaging of the positive current collector: placing chromium liquid in an electroplating bath with a fixed structure (the electroplating bath is a cross-shaped bath, wherein only a chromium liquid containing groove is arranged on a cross line, the groove width is matched with the seal width (equal to the seal width)), then paving an aluminum foil with the thickness of 40 mu m on the surface of the electroplating bath, electroplating to obtain a chromium-containing packaging auxiliary treatment layer with the thickness of 10 mu m, dividing the current collector into a plurality of unprocessed current collector small blocks by the chromium-containing packaging auxiliary treatment layer, and then washing by deionized water to obtain an anode current collector after packaging auxiliary treatment for later use;
the rest is the same as the embodiment 1, and the description is omitted.
Example 6
The difference from the embodiment 1 is that the method comprises the following steps:
preparing electrode slurry: uniformly stirring lithium cobaltate serving as a positive electrode active substance, PVDF (polyvinylidene fluoride) serving as a binder and NMP (N-methyl pyrrolidone) serving as a conductive agent to obtain positive electrode slurry for later use; and uniformly stirring graphite serving as a negative active material, SBR and CMC serving as adhesives, super-P serving as a conductive agent and water serving as a solvent to obtain negative slurry for later use.
And (3) packaging auxiliary treatment of the positive current collector: placing silane coupling agent treatment liquid in an electroplating bath, flatly paving aluminum poise with the thickness of 20 mu m on the surface of the electroplating bath, electroplating to obtain a silane coupling agent-containing packaging auxiliary treatment layer with the thickness of 5 mu m, then cleaning the current collector by using deionized water, cleaning the current collector by using a laser cleaning technology, removing a part of the treatment layer on the surface of the current collector, and obtaining positive current collector only containing the treatment layer in the corresponding area of the cell sealing area for later use;
preparing a positive electrode serving as a packaging structure: coating the positive electrode slurry on the current collector subjected to the packaging auxiliary treatment to obtain an electrode plate coated on one side, cleaning a coating corresponding to a sealing area by using a laser cleaning technology, and cutting to obtain a single positive electrode coated on one side for later use;
and (3) carrying out auxiliary treatment on the encapsulation of the negative current collector: placing silane coupling agent treatment liquid in an electroplating bath, flatly paving copper poise with the thickness of 20 mu m on the surface of the electroplating bath, electroplating to obtain a silane coupling agent-containing packaging auxiliary treatment layer with the thickness of 5 mu m, then cleaning the current collector by using deionized water, cleaning the current collector by using a laser cleaning technology, removing a part of the treatment layer on the surface of the current collector, and obtaining a negative current collector only containing the treatment layer in the corresponding area of the cell sealing area for later use;
preparing a negative electrode serving as a packaging structure: coating the negative electrode slurry on the current collector subjected to the packaging auxiliary treatment to obtain an electrode plate coated on one side, cleaning a coating corresponding to a sealing area by using a laser cleaning technology, and cutting to obtain a single positive electrode coated on one side for later use;
the rest is the same as the embodiment 1, and the description is omitted.
Capacity & volumetric energy density test: capacity testing was performed on the cells of examples 7-12 in a 35 ℃ environment according to the following protocol: standing for 3min; charging to 4.2V at constant current of 0.5C and charging to 0.05C at constant voltage; standing for 3min; discharging to 3.0V at constant current of 0.5C to obtain first discharge capacity D0 and first discharge energy E0; standing for 3min, and then completing the capacity test; and (3) testing the thickness, the length and the width of the battery, calculating the volume V of the battery, and calculating the volume energy density = E0/V of the battery, wherein the obtained result is shown in Table 1.
And (3) impedance testing: from each of comparative examples and examples 1 to 8, 30 cells were taken out and subjected to an impedance test: charging to 3.85V at 35 deg.C with 0.5C, CV to 0.05C; then taking out the battery cell; the cell internal resistance was measured using an electrochemical workstation at a frequency of 30wHZ to obtain the cell impedance reported in table 1.
Self-discharge test: from each of comparative examples and examples 1 to 8, 30 cells were taken out and subjected to a self-discharge test: charging to 3.8V with 0.5C in 35 ℃ environment, and CV to 0.05C; and then taking out the battery core, standing for 48 hours in an environment at 45 ℃, wherein the test voltage is V1, standing for 72 hours at room temperature, and then the test voltage is V2, so that the self-discharge rate of the battery is = (V1-V2)/72 (mV/h).
Testing the packaging reliability: from each of comparative examples and examples 1 to 9, 10 cells were taken out and subjected to a mounting reliability test: charging to 3.8V with 0.5C in 35 ℃ environment, and CV to 0.05C; then taking out the cell to test the thickness of the cell to be h1, then placing the cell in an environment with 70 ℃ and 95% humidity for 7 days, and taking out the cell to test the thickness of the cell to be h2; calculating the thickness expansion rate: (h 2-h 1)/h 1 x 100%; when (h 2-h 1)/h 1 × 100% >10%, the package failure is noted and the results are statistically entered in table 1.
TABLE 1 electric Properties of the batteries of comparative example and example
From table 1, it can be seen from comparison of comparative example 1 and examples 1 to 6 that the present invention can greatly improve the energy density of the battery, and at the same time, reduce the battery impedance and reduce the self-discharge rate of the battery. And the smaller the thickness of the current collector as the packaging material is, the greater the improvement of the volumetric energy density of the battery is, but when the thickness of the current collector is too small, micropores can appear in the production process to influence the sealing reliability, so that the current collector with proper thickness needs to be selected as the packaging material of the battery.
Compared with the embodiment 1 and the embodiment 2, the battery cell has the advantages that the battery cell impedance is increased and the capacity is reduced by reserving the packaging auxiliary treatment layer of the whole current collector; this is because the presence of the encapsulation aid layer affects the effective contact between the coating and the current collector, increasing the contact resistance.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, substitutions or alterations based on the present invention will fall within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. An electrochemical cell comprising a positive electrode, a separator, a negative electrode, an electrolyte, and an outer packaging structure;
the positive electrode consists of a positive current collector and a positive coating layer; the negative electrode consists of a negative current collector and a negative coating layer; the method is characterized in that:
the assembling process of the electrochemical cell comprises a lamination process, and the sum n of the number of the positive electrodes and the number of the negative electrodes is an even number;
the outer packaging structure at least comprises a positive current collector a or/and a negative current collector b;
the external packaging structures are respectively a positive electrode lug and a negative electrode lug of the battery cell;
and the positive current collector a is subjected to packaging auxiliary treatment or/and the negative current collector b is subjected to packaging auxiliary treatment, the thickness of a packaging auxiliary treatment layer is h, and h is less than or equal to 10 mu m.
The thickness of the positive electrode current collector a is greater than or equal to 12 microns, and the thickness of the negative electrode current collector b is greater than or equal to 10 microns.
2. An electrochemical cell according to claim 1, wherein: the sum n of the number of the positive electrodes and the number of the negative electrodes is an even number which is greater than or equal to 4; the external packaging structure comprises a positive current collector a and a negative current collector b, the positive current collector a and the negative current collector b serving as the external packaging structure are coated on one side, and the positive current collector a and the negative current collector b serving as the external packaging structure are positioned on the outermost side of the battery; and the outer side surfaces of the positive electrode current collector a and the negative electrode current collector b which are used as the outer packaging structures are provided with first insulating layers.
3. An electrochemical cell according to claim 1 or 2, wherein: the electrode positioned between the outer packaging structures is a double-sided coated electrode, the double-sided coated electrode comprises a current collector and electrode coatings respectively arranged on two sides of the current collector, and the current collector is a current collector which is not subjected to packaging auxiliary treatment or a current collector which is subjected to packaging auxiliary treatment; the electrodes on the two sides of the isolating membrane are matched electrodes during assembly; the outer packaging structure comprises a water-resisting layer and a sealing layer, the water-resisting layer is the current collector which is used as the outer packaging structure, the sealing layer is arranged on the inner side surface of the water-resisting layer, and the sealing layer is of a three-layer structure and is a first bonding layer, a second insulating layer and a second bonding layer respectively; the first bonding layer bonds the insulating layer and the water-resisting layer together.
4. An electrochemical cell according to claim 3, wherein: all the positive plates and the positive current collector a serving as the external packaging structure are connected together in a welding or/and conductive adhesive bonding mode; and all the negative plates and the negative current collector b serving as the outer packaging structure are connected together in a welding or/and conductive adhesive bonding mode.
5. An electrochemical cell according to claim 1, wherein: the thickness of the positive current collector is more than or equal to 20 mu m, and the positive current collector consists of gold, silver, copper, iron, tin, zinc, lead, nickel, aluminum, tungsten, molybdenum, tantalum, niobium, titanium and at least one of steel and stainless steel, nickel-based alloy and cobalt-based alloy; the thickness of the negative current collector is more than or equal to 15 mu m, and the negative current collector consists of gold, silver, copper, iron, tin, zinc, lead, nickel, aluminum, tungsten, molybdenum, tantalum, niobium, titanium and at least one of steel and stainless steel, nickel-based alloy and cobalt-based alloy; the positive electrode coating layer contains a positive active substance and is only distributed on one surface of the positive current collector in the positive electrode serving as an external packaging structure; the negative electrode coating contains a negative active material, and is used as the negative electrode of the external packaging structure, and the negative coating layer is only distributed on one surface of the negative current collector; the positive active material includes at least one of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron oxide, lithium vanadium oxide, sulfur or sulfide, ternary or multicomponent composite compound, and polyanion cathode material; the negative electrode active material includes at least one of a carbon material, a carbonaceous compound, and a non-carbon material.
6. An electrochemical cell according to claim 1, wherein: the thickness h of the packaging auxiliary treatment layer is less than or equal to 5 mu m, and the packaging auxiliary treatment layer is at least distributed in the packaging area of the battery; the packaging auxiliary treatment comprises at least one of polishing treatment, plating treatment, organosilicon treatment or anodic oxidation.
7. An electrochemical cell according to claim 6, wherein: the polishing treatment comprises a mechanical polishing treatment or/and a chemical polishing treatment; the electroplating treatment comprises at least one of zinc plating treatment, copper plating treatment, chromium plating treatment, lead plating treatment, silver plating treatment, nickel plating treatment, tin plating treatment or cadmium plating treatment; the organosilicon treatment comprises at least one of a silane coupling agent, a silane crosslinking agent, a silicone resin or a polysiloxane; the silane coupling comprises at least one of vinyl trichlorosilane, vinyl triethoxysilane, vinyl tri (beta-methoxyethoxy) silane, gamma-glycidoxypropyl-trimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl-trimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl-methyl-trimethoxysilane, gamma-chloropropyl-trimethoxysilane, gamma-mercaptopropyl-trimethoxysilane and gamma-aminopropyl-trimethoxysilane; the silane cross-linking agent comprises at least one of methyl triacetoxysilane, vinyl trimethoxy silane and vinyl triethoxy silane; the silicon resin comprises at least one of methyl phenyl silicon resin, chlorphenyl methyl silicon resin, methyl trifluoro propyl silicon resin and acrylic acid modified resin; the polysiloxane comprises at least one of carboxyl-terminated-block-organopolysiloxane and alkoxy-terminated-block-organopolysiloxane.
8. A method of making an electrochemical cell according to claim 1, comprising the steps of:
step 1, preparing electrode slurry: uniformly stirring the positive active substance, a conductive agent, an adhesive and a solvent to obtain positive slurry for later use; uniformly stirring the negative active material, a conductive agent, a bonding agent and a solvent to obtain negative slurry for later use;
and 2, performing current collector packaging auxiliary treatment: performing packaging auxiliary treatment on the positive current collector by adopting a packaging auxiliary treatment process, so that a packaging auxiliary treatment layer with the thickness h less than or equal to 10 mu m is attached to the surface of the positive current collector, and thus obtaining a positive current collector a subjected to packaging auxiliary treatment for later use; performing packaging auxiliary treatment on the negative current collector by adopting a packaging auxiliary treatment process, so that a packaging auxiliary treatment layer with the thickness h less than or equal to 10 micrometers is attached to the surface of the negative current collector, and thus obtaining a negative current collector b subjected to packaging auxiliary treatment for later use;
step 3, preparing an electrode serving as a packaging structure: coating the positive electrode slurry obtained in the step (1) on the positive electrode current collector a obtained in the step (2), drying and processing to obtain a single-surface coated positive electrode with a plurality of coating areas with the length of L, the width of d and the area of S, wherein the periphery of the coating is also provided with a hollow foil area for standby; coating the negative electrode slurry obtained in the step (1) on the negative electrode current collector b obtained in the step (2), drying and processing to obtain a single-surface coated negative electrode with a coating area with the length of L, the width of d and the area of S, wherein the periphery of the coating also contains a hollow foil area for standby;
step 4, preparing a double-sided electrode: coating the positive electrode slurry obtained in the step (1) on two sides of a positive electrode current collector, drying and cutting to obtain a double-coated positive electrode for later use; coating the negative electrode slurry obtained in the step (1) on two sides of a negative electrode current collector, drying and cutting to obtain a double-coated negative electrode for later use;
step 5, assembling the battery cell: stacking the anode electrode obtained in the step 3, the isolating film, the cathode electrode obtained in the step 4, the isolating film, the anode electrode obtained in the step 4, the isolating film, the cathode electrode … … obtained in the step 4, the anode electrode obtained in the step 4, the isolating film and the cathode electrode obtained in the step 3 in sequence to obtain a bare cell, wherein the total number of stacked electrodes is more than or equal to 4; welding or/and gluing all positive electrodes in the bare cell on the empty foil area of the positive electrode current collector a in the step 3, and welding or/and gluing all negative electrodes on the empty foil area of the negative electrode current collector b in the step 3;
step 6, preparing a finished product battery core: and (5) packaging, injecting, forming, shaping and slitting the battery core assembled in the step (5) to obtain a single finished electrochemical battery.
9. A method for preparing an electrochemical cell according to claim 8, wherein the thickness h of the encapsulation auxiliary treatment layer in step 2 is less than or equal to 5 μm; the packaging auxiliary treatment comprises at least one of polishing treatment, plating treatment, organic silicon treatment or anodic oxidation; and 3, the method for preparing the single-side coating and the gaps thereof comprises at least one of intermittent coating, solvent cleaning, laser cleaning and auxiliary layer stripping.
10. The method for preparing the electrochemical cell according to claim 8, wherein the current collector packaging auxiliary treatment manner in step 2 includes a printing treatment and/or a soaking treatment, the printing treatment refers to pre-disposing a treatment fluid on a template corresponding to the current collector coating empty foil area, and only treating the coating empty foil area as a packaging area, the soaking treatment refers to soaking the current collector in the treatment fluid or/and carrying the current collector with the treatment fluid to treat the whole current collector; and 5, before the packaging, arranging a sealing layer at a position corresponding to the seal, wherein the sealing layer comprises at least one of polyethylene, polypropylene, modified polyethylene, modified polypropylene, hot melt adhesive and reactive hot melt adhesive.
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| CN107086276A (en) * | 2017-04-25 | 2017-08-22 | 北京卫蓝新能源科技有限公司 | A kind of packaging material for battery and the battery containing the material |
| CN107611480A (en) * | 2017-08-07 | 2018-01-19 | 湖南立方新能源科技有限责任公司 | A kind of electrodeless lug lithium ion battery |
| CN108736054A (en) * | 2017-04-13 | 2018-11-02 | 丰田自动车株式会社 | Laminate type battery |
| WO2020006967A1 (en) * | 2018-07-06 | 2020-01-09 | 惠州赛尔雷新能源科技有限公司 | Tab-free solid lithium battery |
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