CN115411230B - Sodium ion battery coating process - Google Patents
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- CN115411230B CN115411230B CN202211182451.2A CN202211182451A CN115411230B CN 115411230 B CN115411230 B CN 115411230B CN 202211182451 A CN202211182451 A CN 202211182451A CN 115411230 B CN115411230 B CN 115411230B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
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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
- H01M4/0402—Methods of deposition of the material
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/029—Bipolar electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
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Abstract
A sodium ion battery coating process. The invention belongs to the technical field of solid-state battery production, and comprises the steps of manufacturing bipolar battery rolls, preparing sealant and coating. When the adhesive is prepared, firstly, the hot melt adhesive is melted, then inorganic insulating powder is added into the hot melt adhesive, and the inorganic insulating powder is uniformly mixed in the hot melt adhesive to obtain the sealant; and pushing the hot-melt sealant arranged in the glue dispensing device into a casting die by using a conveying device, extruding the sealant from a glue outlet structure of the casting die, and coating the sealant in a reserved glue coating area on the current collector. The inorganic insulating powder with a certain proportion is added into the hot melt adhesive, so that the sealant for coating is obtained, the hot melt adhesive can meet the bonding and fixing requirements of current collectors, diaphragms and current collectors when in thermoplastic molding, the sealing effect is achieved, electrolyte leakage is prevented, the added inorganic insulating powder is used as a support body for limiting the distance between adjacent current collectors, namely, the adjacent current collectors can be prevented from being contacted due to a certain reason, and the functions of isolating positive and negative current collectors and preventing short circuits are achieved.
Description
Technical Field
The invention belongs to the technical field of solid-state battery production, and particularly relates to a sodium ion battery coating process.
Background
Electrons of the bipolar battery flow from one end of the current collector to the other end directly, the thickness of the current collector is the transmission distance of the electrons, and the area of the pole piece is the electron transmission area. Ohmic resistance is much less than conventional pole pieces, either in laminated or wound form. Therefore, the bipolar battery can realize the charge and discharge of multiplying power above 10 ℃ without heat accumulation and fusing inside the battery. However, the bipolar battery has a battery structure different from that of a conventional battery, and insulation and sealing treatments are required between bipolar electrode plates.
Disclosure of Invention
The present invention is directed to a coating process of a bipolar battery, by which insulation and sealing between bipolar electrode sheets are ensured.
In order to achieve the above purpose, the present invention provides the following technical solutions: the invention provides a sodium ion battery coating process, which comprises the following steps:
Step 1, respectively coating positive electrode active materials and negative electrode active materials on the front surface and the back surface of a current collector, and reserving gluing areas on the front surface and the back surface of the current collector along the two sides of the length direction; then, carrying out a rolling procedure, and finally winding the current collectors coated with the positive electrode active material and the negative electrode active material into a roll to obtain a bipolar battery roll;
Step 2, selecting a roll of the bipolar battery roll manufactured in the step 1, installing the bipolar battery roll on an unreeling roller of a coating device, and then dragging the free end of the bipolar battery roll to a winding roller and fixing the free end of the bipolar battery roll on the winding roller; the glue coating areas on two sides of the bipolar battery roll respectively pass through a glue outlet structure of a tape casting die;
Step 3, configuring sealant by using a glue preparation device; firstly, putting hot melt adhesive particles into a hot melt adhesive bin of an adhesive preparation device, melting the hot melt adhesive, then, keeping the hot melt adhesive in a hot melt state by adding inorganic insulating powder with the particle size of 1-15 microns into the hot melt adhesive, and uniformly mixing the inorganic insulating powder in the hot melt adhesive to obtain the sealant;
Step 4, pushing the hot melt sealant configured in the glue dispensing device into a casting die by using a conveying device; simultaneously starting the coating device, enabling the winding roller to start to rotate and wind the bipolar battery roll, and enabling the bipolar battery roll to always move at a constant speed;
step 5, extruding sealant from a glue outlet structure of a tape casting die and coating the sealant in a reserved gluing area on a current collector to form a sealing adhesive tape of the bipolar battery roll; in addition, it is ensured that the sealant ejected from the casting die has solidified when reaching the wind-up roll;
Step 6, after releasing all the bipolar battery rolls on the unreeling roller on the coating device, firstly closing the conveying device, and then taking down the bipolar battery rolls on the reeling roller; step 2, and steps 4-6 are then repeated in that order.
According to the technical scheme, the inorganic insulating powder with a certain proportion is added into the hot melt adhesive, so that the sealant for coating is obtained, the hot melt adhesive can meet the bonding and fixing requirements of the current collector, the diaphragm and the current collector when in thermoplastic molding, the sealing effect is achieved, electrolyte leakage is prevented, the added inorganic insulating powder serves as a support body for limiting the interval between adjacent current collectors, namely, the adjacent current collectors can be prevented from being contacted due to a certain reason, and the effects of isolating positive and negative current collectors and preventing short circuits are achieved, so that the coating process can simultaneously meet the production requirements of sealing and insulating between bipolar pole pieces.
Preferably, the hot melt adhesive is mixed with the inorganic insulating powder in a volume ratio of 50:50 to 80:20. The hot melt adhesive has the functions of sealing and bonding and fixing adjacent current collectors and diaphragms, and the inorganic insulating powder is used for isolating positive and negative current collectors and does not have tackiness, so that the high-proportion hot melt adhesive can improve the sealing performance and bonding and fixing strength, and the high-proportion inorganic insulating powder can form a more compact isolation structure in the sealant, so that the external force resistance strength of the sealant is improved, and the insulating performance of the positive and negative current collectors is improved. The sealant with moderate viscosity and insulativity can be obtained by reasonably proportioning the two components, so that the service life of the bipolar pole piece is prolonged, and the safety of the bipolar battery is improved.
Preferably, the inorganic insulating powder component includes: 20% by volume of particulate matter having a particle size of 15 microns, 30% by volume of particulate matter having a particle size of 5 microns, and 50% by volume of particulate matter having a particle size of 1 micron. The spacing interval of the particle materials with different particle sizes on the current collector is different, the larger the particle size is, the larger the spacing interval is, the larger the influence on the bonding fixing performance of the hot melt adhesive is, a small proportion of particle materials with particle sizes of 15 microns are adopted, the particle materials can be uniformly dispersed in a gluing area to form a first stage supporting structure in sparse distribution, more 5 microns of particle materials are uniformly dispersed around the first stage supporting structure to form a second stage supporting structure, a large amount of particle materials with particle sizes of 1 micron are fully dispersed between the first stage supporting structure and the second stage supporting structure to form a third stage supporting structure, the three stage supporting structures are used for hierarchically limiting the current collector, and the positive electrode and the negative electrode of the current collector can be prevented from being contacted at a certain point due to external force while the bonding fixing performance of the hot melt adhesive is ensured.
Preferably, the particulate matter comprises aluminum oxide or a mixture of aluminum oxide and boehmite.
Preferably, the hot melt adhesive comprises at least two polymer components, EVA and one or two of copolymerized PP and homo-polymerized PP, wherein the polymer components are mixed according to a proportion, and the melting point of the mixed hot melt adhesive is 120-150 ℃. When the bipolar battery is sealed, the heating temperature of the sealant on the bipolar pole piece is 120-160 ℃, and the sealant between the adjacent bipolar pole pieces is melted and cooled along with the sealant, so that the four faces of the bipolar battery are sealed, and the heating temperature does not influence the performances of the aluminum plastic film CPP and the diaphragm.
Preferably, the hot melt adhesive further comprises a CPP material, the CPP (cast polypropylene film) has higher fluidity in a molten state, the hot melt adhesive added with the CPP and the inorganic insulating powder are mixed according to a certain proportion, the inorganic insulating powder can be fully kneaded and dispersed in a double-screw extruder, and the hot melt adhesive can be more smoothly cast into a die under the action of the double-screw extruder, so that the hot melt adhesive is uniformly and equivalently coated on a gluing area of the bipolar pole piece.
Preferably, in the step 2, the glue outlet structure of the casting mold has two glue outlets, the glue coating areas on two sides of the bipolar battery roll pass through the middle of the two glue outlets, in the step 4 and the step 5, the sealant overflows from the two glue outlets on the two glue outlets, and simultaneously, the glue coating areas on the front and the back of the bipolar battery roll are coated, so that the coating process of the sealant can be completed only by winding the bipolar battery roll once, the coating efficiency can be improved, and the damage probability of the polar battery roll can be reduced.
Preferably, in step 5, the temperature of the sealing tape coated on the bipolar battery roll is reduced at the downstream of the casting die, so that the sealing tape can be ensured to have a stable form when reaching the winding roller by reducing the temperature of the sealing tape, and the abnormal curing of the sealing tape after winding is prevented, so that the accumulation of the sealing tape and the influence of the abnormal curing of the sealing tape on the subsequent manufacturing process of the battery during winding can be avoided.
Preferably, in step 5, before the sealant on the bipolar battery roll is cooled and uncured, the glued sealing adhesive tape is shaped at the downstream of the casting die, so that a convex structure extending along the length direction is formed on the sealing adhesive tape, and the convex structures formed on the sealing adhesive tapes on the front and back sides of the same side of the current collector are arranged in a staggered manner, so that when the bipolar battery rolls are overlapped, the convex structure on one layer is opposite to the gap of the convex structure on the other layer. In the sealing process of the bipolar battery, the sealing glue of the stacked bipolar battery is required to be heated and pressurized, the excessive pressure can cause the sealing glue to overflow, the excessive pressure can not realize the sufficient bonding of the adjacent sealing glue, and the raised structures are melted in the heating process, and the raised structures on one side are opposite to the structural gaps on the other side, so that the raised structures on the adjacent side overflow to two sides under proper pressure, so that the raised structures on the adjacent side are fused into a whole in the transverse direction, the sealing efficiency can be accelerated, the bonding strength of the sealing glue can be improved, and the sealing property is improved.
The invention has the following beneficial effects:
1. The sealant is added with inorganic insulating powder in a certain proportion, and the inorganic insulating powder with proper particle size plays a role in isolating positive and negative current collectors and preventing the positive and negative current collectors from contacting, thereby avoiding short circuit of the battery.
2. The CPP material in the sealant has good fluidity after being melted, and can be uniformly spread, so that the current collector, the diaphragm and the current collector are bonded together, and electrolyte leakage is prevented. Meanwhile, the fluidity of the inorganic insulating powder is favorable for uniformly kneading and dispersing the inorganic insulating powder in the extrusion process of a conveying device, so that the sealing glue area coated by the casting die has good insulating property everywhere.
3. The process can be used for simultaneously coating the sealant on the four gluing areas of the current collector, so that the production efficiency is improved, and the wear probability of the bipolar battery roll can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
Fig. 1 is a schematic plan view of a coating device for assisting in performing a coating process according to the present invention;
fig. 2 is a schematic plan view of the sealant after molding.
In the figure, a coating device 1, an unreeling roller 2, a reeling roller 3, a bipolar battery roll 4, a glue preparation device 5, a casting die 6, a double-screw extruder 7, a hot melt glue stock bin 8, an inorganic insulating powder stock bin 9, a shaping device 10, a cooling device 11, a sealing tape 12, a raised structure 121 and a structural gap 122.
Detailed Description
The following detailed description of embodiments of the present application will be given with reference to the accompanying drawings and examples, by which the implementation process of how the present application can be applied to solve the technical problems and achieve the technical effects can be fully understood and implemented.
The invention provides a sodium ion battery coating process embodiment, which comprises the following steps:
Step 1, respectively coating positive electrode active materials and negative electrode active materials on the front surface and the back surface of a current collector, and reserving gluing areas on the front surface and the back surface of the current collector along the two sides of the length direction; then, carrying out a rolling procedure, and finally winding the current collectors coated with the positive electrode active material and the negative electrode active material into a roll to obtain a bipolar battery roll;
Step 2, selecting a roll of the bipolar battery roll 4 prepared in the step 1 to be mounted on the unreeling roll 2 of the coating device 4, and then dragging the free end of the bipolar battery roll to the reeling roll 3 and fixing the free end on the reeling roll; the glue coating areas at two sides of the bipolar battery roll respectively pass through the glue outlet structures of the tape casting dies 6 at two sides; the glue outlet structure of the tape casting mold is provided with an upper glue outlet and a lower glue outlet, glue coating areas on two sides of the bipolar battery roll pass through the middle of the upper glue outlet and the lower glue outlet, and sealing glue overflows from the upper glue outlet and the lower glue outlet of the glue outlet structure respectively, so that the glue coating areas on the front side and the back side of the bipolar battery roll can be coated at the same time, and the coating process of the sealing glue can be completed only by winding the bipolar battery roll once, so that the coating efficiency can be improved, and the damage probability of the polar battery roll can be reduced.
Step 3, configuring sealant by using a sealant preparing device 5; firstly, hot melt adhesive particles are added into a hot melt adhesive stock bin 8 of an adhesive preparation device 5 to melt the hot melt adhesive, then inorganic insulating powder with the particle size of 1-15 microns is added into the melted hot melt adhesive through an inorganic insulating powder stock bin 9, the hot melt adhesive is kept in a hot melt state, and the inorganic insulating powder is uniformly mixed in the hot melt adhesive to obtain the sealant; specifically, the hot melt adhesive comprises three polymer components including EVA, copolymerized PP and homopolymerized PP, and further comprises CPP (cast polypropylene film), wherein the components are mixed according to a proportion, and the melting point of the mixed hot melt adhesive is 130 ℃. When the bipolar battery is sealed, the heating temperature of the sealant on the bipolar pole piece is 120-160 ℃, and the sealant between the adjacent bipolar pole pieces is melted and cooled along with the sealant, so that the four faces of the bipolar battery are sealed, and the heating temperature does not influence the performances of the aluminum plastic film CPP and the diaphragm. And because CPP (cast polypropylene film) has higher fluidity in the molten state, the hot melt adhesive and inorganic insulating powder can be fully kneaded and dispersed in the double-screw extruder 7 after being mixed according to a certain proportion, and the hot melt adhesive can be more smoothly cast into a die under the action of the double-screw extruder, so that the hot melt adhesive can be uniformly and equivalently coated on a gluing area of the bipolar pole piece.
In this embodiment, the inorganic insulating powder is a particulate matter obtained by mixing aluminum oxide and boehmite according to a volume ratio of 1:1, wherein, because the spacing intervals of the particulate matters with different particle sizes on the current collector are different, the larger the particle size is, the larger the spacing interval is, the larger the influence on the adhesion fixing performance of the hot melt adhesive is also, if a small proportion of the particulate matters with large particle sizes are adopted, the particulate matters can be uniformly dispersed in a gluing area to form a first stage supporting structure with sparse distribution, then more particulate matters with medium particle sizes are adopted, a second stage supporting structure is formed by uniformly dispersing the particulate matters around the first stage supporting structure, and then a large amount of particulate matters with small particle sizes are fully dispersed between the first stage supporting structure and the second stage supporting structure to form a third stage supporting structure. Considering the adhesive strength and insulation performance of the hot melt adhesive comprehensively, the inorganic insulating powder used in the embodiment is divided into three granular substances with different particle sizes according to the volume ratio: 20% of particulate matter having a particle size of 15 microns, 30% of particulate matter having a particle size of 5 microns, and 50% of particulate matter having a particle size of 1 micron. Based on the inorganic insulating powder in the embodiment, the hot melt adhesive and the inorganic insulating powder are mixed according to the volume ratio of 70:30 to obtain the sealant with moderate viscosity and insulativity, thereby meeting the requirements of the bipolar battery on insulativity and sealability between bipolar pole pieces.
Step 4, pushing the hot melt sealant arranged in the sealant dispensing device 5 into casting molds 6 at two sides of the bipolar battery roll by using a double-screw extruder 7; at the same time, the coating device 1 is started, and at this time, the winding roller 3 starts to rotate and wind the bipolar battery roll, and the coating device is arranged to keep the bipolar battery roll to have a stable moving speed.
Step 5, along with the step 4, extruding the sealing glue of the bipolar battery roll from a glue outlet of a tape casting die and uniformly coating the sealing glue in a glue coating area reserved on a current collector to form a sealing adhesive tape 12 of the bipolar battery roll; as shown in fig. 1, a shaping device 10 is arranged at one position downstream of the casting die, the shaping device 10 is provided with an upper rolling wheel and a lower rolling wheel, the sealing adhesive tape 12 is not solidified when the bipolar battery rolls pass through the rolling wheels, then the sealing adhesive tape on the front and the back of the bipolar battery rolls is shaped by extrusion of the rolling wheels, a plurality of convex structures 121 extending along the length direction are formed on the sealing adhesive tape, structural gaps 122 which are wider than the convex structures are formed between the convex structures, and the convex structures 121 on the positive surface and the negative surface of the adjacent bipolar battery rolls are arranged in a staggered manner, so that when two layers of bipolar battery rolls are overlapped, the convex structures 121 on one layer are opposite to the structural gaps 122 of the convex structures on the other layer; meanwhile, a cooling device 11 is arranged at one position at the downstream of the shaping device 10, and sealing tapes 12 at two sides of the bipolar battery roll 4 pass through the cooling device 11 and finish cooling and solidification; the cooling of the sealant can ensure that the sealant has a stable form when reaching the winding roller, and prevent the sealant from being cured in a special shape after winding, so that the sealant is prevented from piling up during winding and the sealant cured in a special shape can be prevented from affecting the subsequent manufacturing process of the battery.
Step 6, after releasing all the bipolar battery rolls on the unreeling roller on the coating device, firstly closing the double-screw extruder, and then taking down the bipolar battery rolls on the reeling roller; and then repeating the steps 2-6 in sequence, so as to improve the supply efficiency, enough sealant can be prepared in the step 3 at one time, and the sealant coating step can be directly carried out on the bipolar battery roll produced in the step 1.
In the embodiment, a certain proportion of inorganic insulating powder is added into the sealant, wherein high polymer components in the sealant play roles in bonding the current collector and the diaphragm, coating the inorganic insulating powder and isolating electrolyte, and the inorganic insulating powder with different particle diameters is uniformly distributed in the sealant to play a role in isolating adjacent current collectors. In the sealing process of the bipolar battery, the inorganic insulating powder can prevent the polymer sealant from being melted and thinned or extruded to reduce the distance between adjacent foils or contact the adjacent foils and cause short circuit. In addition, the heating device in the sealing process melts the raised structures, and as the raised structures on one side are opposite to the structural gaps on the other side, hot melt adhesive components of the raised structures overflow to two sides under proper pressure, so that the raised structures on the adjacent sides are integrated in the transverse direction, the sealing efficiency can be improved, the adhesive strength of the sealant can be improved, and the sealing performance is improved.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (9)
1. A sodium ion battery coating process comprising the steps of:
Step 1, respectively coating positive electrode active materials and negative electrode active materials on the front surface and the back surface of a current collector, and reserving gluing areas on the front surface and the back surface of the current collector along the two sides of the length direction; then, carrying out a rolling procedure, and finally winding the current collectors coated with the positive electrode active material and the negative electrode active material into a roll to obtain a bipolar battery roll;
Step 2, selecting a roll of the bipolar battery roll manufactured in the step 1, installing the bipolar battery roll on an unreeling roller of a coating device, and then dragging the free end of the bipolar battery roll to a winding roller and fixing the free end of the bipolar battery roll on the winding roller; the glue coating areas on two sides of the bipolar battery roll respectively pass through a glue outlet structure of a tape casting die;
step 3, configuring sealant by using a glue preparation device; firstly, melting the hot melt adhesive, then adding inorganic insulating powder with the particle size of 1-15 microns into the hot melt adhesive, keeping the hot melt adhesive in a hot melt state, and uniformly mixing the inorganic insulating powder in the hot melt adhesive to obtain the sealant;
Step 4, pushing the hot melt sealant configured in the glue dispensing device into a casting die by using a conveying device; simultaneously starting the coating device, enabling the winding roller to start to rotate and wind the bipolar battery roll, and enabling the bipolar battery roll to always move at a constant speed;
Step 5, extruding the sealant from a sealant outlet structure of the casting die, coating the sealant in a reserved gluing area on the current collector, and ensuring that the sealant sprayed from the casting die is solidified when reaching a winding roller;
Step 6, after releasing all the bipolar battery rolls on the unreeling roller on the coating device, firstly closing the conveying device, and then taking down the bipolar battery rolls on the reeling roller; and then repeating the step 2 and the step 4-6 in sequence.
2. A sodium ion battery coating process as defined in claim 1, wherein: the hot melt adhesive and the inorganic insulating powder are mixed according to the volume ratio of 50:50-80:20.
3. A sodium ion battery coating process as defined in claim 2, wherein: the inorganic insulating powder composition comprises: 20% by volume of particulate matter having a particle size of 15 microns, 30% by volume of particulate matter having a particle size of 5 microns, and 50% by volume of particulate matter having a particle size of 1 micron.
4. A sodium ion battery coating process as claimed in any one of claims 3, wherein: the particulate matter comprises aluminum oxide, boehmite.
5. A sodium ion battery coating process as defined in claim 3, wherein: the hot melt adhesive comprises at least two polymer components, EVA and one or two of copolymerized PP and homo-polymerized PP, wherein the polymer components are mixed according to a proportion, and the melting point of the mixed hot melt adhesive is 120-150 ℃.
6. A sodium ion battery coating process as defined in claim 5, wherein: the hot melt adhesive also comprises CPP material.
7. A sodium ion battery coating process as defined in any one of claims 1-6, wherein: in the step 2, the glue outlet structure of the casting mold is provided with an upper glue outlet and a lower glue outlet, the glue coating areas on the two sides of the bipolar battery roll pass through the middle of the upper glue outlet and the lower glue outlet, and in the step 4 and the step 5, the sealant overflows from the upper glue outlet and the lower glue outlet of the glue outlet structure respectively, and the glue coating areas on the front side and the back side of the bipolar battery roll are coated simultaneously.
8. A sodium ion battery coating process as defined in any one of claims 1-6, wherein: in step 5, the sealing tape coated on the bipolar battery roll is cooled downstream of the casting die.
9. A sodium ion battery coating process as defined in any one of claims 1-6, wherein: in step 5, before the sealant on the bipolar battery roll is not cured, the sealant in the gluing area is molded at the downstream of the casting die, so that a convex structure extending along the length direction is formed on the sealant, and the convex structures formed on the sealant on the front surface and the back surface of the same side of the current collector are arranged in a staggered manner, thereby meeting the requirement that when two layers of bipolar battery rolls are overlapped, the convex structure on one layer is opposite to the gap of the convex structure on the other layer.
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| JP5601186B2 (en) * | 2010-12-15 | 2014-10-08 | 日産自動車株式会社 | Method for manufacturing bipolar electrode |
| CN109256580A (en) * | 2018-09-28 | 2019-01-22 | 桑顿新能源科技有限公司 | A kind of soft bag lithium ionic cell and preparation method thereof improving heavy impact performance |
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