CN116833066A - Insulating protective coating for battery and preparation method thereof - Google Patents
Insulating protective coating for battery and preparation method thereof Download PDFInfo
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- CN116833066A CN116833066A CN202310866749.3A CN202310866749A CN116833066A CN 116833066 A CN116833066 A CN 116833066A CN 202310866749 A CN202310866749 A CN 202310866749A CN 116833066 A CN116833066 A CN 116833066A
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- battery
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- protective coating
- insulating protective
- paint
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- 239000011253 protective coating Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000003973 paint Substances 0.000 claims abstract description 99
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 238000007590 electrostatic spraying Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 10
- 238000000889 atomisation Methods 0.000 claims description 5
- 238000005243 fluidization Methods 0.000 claims description 4
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- 238000005406 washing Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 description 16
- 239000010410 layer Substances 0.000 description 11
- 229920000642 polymer Polymers 0.000 description 11
- 238000010292 electrical insulation Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 8
- 230000005686 electrostatic field Effects 0.000 description 7
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- 239000007921 spray Substances 0.000 description 6
- 239000011256 inorganic filler Substances 0.000 description 5
- 229910003475 inorganic filler Inorganic materials 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 5
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- 239000000428 dust Substances 0.000 description 4
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- 238000007493 shaping process Methods 0.000 description 4
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- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 230000002195 synergetic effect Effects 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The application provides an insulating protective coating for a battery and a preparation method thereof, wherein the preparation method of the insulating protective coating for the battery comprises the following steps: and (5) performing a cleaning operation on the battery. And drying the cleaned battery. And adopting the insulating paint to carry out electrostatic spraying operation on the dried battery. And (3) performing curing operation on the sprayed battery, so that an insulating protective coating is formed on the shell of the battery. The battery is subjected to electrostatic spraying operation by adopting the insulating paint, namely the insulating paint with charges is uniformly adsorbed on the shell of the battery under the action of electrostatic force, so that the problem of the occurrence of bubbles can be effectively avoided. In the electrostatic spraying process, only the position which is not required to be insulated is covered by a template, and the rest areas are not overlapped after electrostatic spraying. By performing a curing operation on the battery, i.e., the insulating coating forms a uniform, continuous, flat and smooth insulating protective coating after curing on the battery's housing.
Description
Technical Field
The application relates to the field of batteries, in particular to an insulating protective coating for a battery and a preparation method thereof.
Background
Along with the development of new energy industry, the lithium ion battery is increasingly widely applied due to the advantages of high energy density, long cycle life, good multiplying power performance, safety and reliability.
However, in the production process of the lithium ion battery, the shell needs to be subjected to insulation treatment by a blue film, and the main purpose is to perform insulation protection on the battery core. However, the following problems exist in the manner of applying an insulating protective coating: 1. the envelope has the problem of bubbles. 2. The presence of the protective film overlap area on the film affects the cell size. 3. The film pasting process is low in efficiency due to the requirement of film pasting precision, so that the production efficiency of the battery is low.
Disclosure of Invention
The application aims to overcome the defects in the prior art and provide an insulating protective coating for a battery and a preparation method thereof, wherein the insulating protective coating can not generate bubbles and overlap areas and can improve the production efficiency of the battery.
The aim of the application is realized by the following technical scheme:
a method for preparing an insulating protective coating for a battery, comprising the steps of:
performing a cleaning operation on the battery;
drying the cleaned battery;
carrying out electrostatic spraying operation on the dried battery by adopting the insulating paint;
and (3) performing curing operation on the sprayed battery, so that an insulating protective coating is formed on the shell of the battery.
In one embodiment, the specific operation steps of the cleaning operation for the battery are as follows:
and adopting hot water to clean the battery.
In one embodiment, the water temperature of the hot water is 35 ℃ to 50 ℃.
In one embodiment, the specific operation steps of the drying operation of the cleaned battery are as follows:
and drying the battery by hot air.
In one embodiment, the temperature of the hot air is 110 ℃ to 140 ℃.
In one embodiment, the specific operation steps of performing electrostatic spraying operation on the dried battery by using the insulating paint are as follows:
heating and fluidizing the insulating paint to obtain fluid insulating paint;
electrifying the fluid insulating paint to obtain electrified insulating paint;
and carrying out atomization spraying operation on the charged insulating coating so that the insulating protective coating is formed on the shell of the battery.
In one embodiment, the heating temperature of the heated fluidization operation is from 100 ℃ to 200 ℃.
In one embodiment, the specific operation steps of applying electricity to the fluid insulating paint are as follows:
and applying voltage to the fluid insulating paint through a high-voltage device to obtain the charged insulating paint.
In one embodiment, the voltage value is 10kv to 110kv.
The insulating protective coating is prepared by adopting the preparation method of the insulating protective coating for the battery in any embodiment.
Compared with the prior art, the application has at least the following advantages:
1. according to the preparation method of the insulating protective coating for the battery, the battery is firstly cleaned, namely the surface of the battery is cleaned, so that foreign matters on the surface of the battery are removed, and the cleanliness of the surface of the battery can be ensured. Secondly, the battery is dried, so that the dryness of the surface of the battery can be ensured, and the follow-up spraying operation is convenient to carry out. Then, the battery is subjected to electrostatic spraying operation by adopting the insulating paint, namely the insulating paint with charges is uniformly adsorbed on the shell of the battery under the action of electrostatic force, so that the problem of bubbles can be effectively avoided. In addition, in the electrostatic spraying process, only the position which is not required to be insulated is covered by the template, and the rest areas are not overlapped after electrostatic spraying. Finally, the battery is cured, namely, the insulating coating forms a uniform, continuous, flat and smooth insulating protective coating after being cured on the shell of the battery.
2. Compared with the traditional film pasting technology, the preparation method of the insulating protective coating for the battery disclosed by the application has the advantages that the insulating coating can be uniformly adsorbed on the shell of the battery by utilizing the action of electrostatic force, the laminating precision of the insulating protective coating can be met, the production time of the battery can be shortened to a greater extent, and the production efficiency of the battery is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of preparing an insulating protective coating for a battery in an embodiment;
FIG. 2 is a flowchart showing steps of S300 shown in FIG. 1;
FIG. 3 is a flowchart showing the specific steps of S303 shown in FIG. 2;
FIG. 4 is a schematic diagram of an electrostatic spraying apparatus according to an embodiment;
FIG. 5 is a schematic view of a structure of a battery fabricated by a conventional encapsulation process;
fig. 6 is a schematic view of a structure of a battery fabricated by using the method for preparing an insulating protective coating according to the present application.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The preparation method of the insulating protective coating for the battery provided by the application comprises the following steps: and (5) performing a cleaning operation on the battery. And drying the cleaned battery. And adopting the insulating paint to carry out electrostatic spraying operation on the dried battery. And (3) performing curing operation on the sprayed battery, so that an insulating protective coating is formed on the shell of the battery.
According to the preparation method of the insulating protective coating for the battery, firstly, the battery is cleaned, namely the surface of the battery is cleaned, so that foreign matters on the surface of the battery are removed, and the cleanliness of the surface of the battery can be ensured. Secondly, the battery is dried, so that the dryness of the surface of the battery can be ensured, and the follow-up spraying operation is convenient to carry out. Then, the battery is subjected to electrostatic spraying operation by adopting the insulating paint, namely the insulating paint with charges is uniformly adsorbed on the shell of the battery under the action of electrostatic force, so that the problem of bubbles can be effectively avoided. In addition, in the electrostatic spraying process, only the position which is not required to be insulated is covered by the template, and the rest areas are not overlapped after electrostatic spraying. Finally, the battery is cured, namely, the insulating coating forms a uniform, continuous, flat and smooth insulating protective coating after being cured on the shell of the battery.
Further, compared with the traditional film pasting process, the insulating paint can be uniformly adsorbed on the shell of the battery by utilizing the action of electrostatic force, so that the pasting precision of the insulating protective coating can be met, the production time of the battery can be shortened to a greater extent, and the production efficiency of the battery is effectively improved.
Referring to fig. 1, in order to better understand the preparation method of the insulating protective coating for a battery of the present application, the preparation method of the insulating protective coating for a battery is further explained as follows:
the preparation method of the insulating protective coating for the battery in one embodiment comprises the following steps:
and S100, performing a cleaning operation on the battery.
In this embodiment, the battery is cleaned, that is, dust or foreign matter present on the surface of the battery is removed, so that the flatness of the subsequent insulating protective coating formation is facilitated.
And S200, drying the cleaned battery.
In this embodiment, through carrying out the stoving operation to the battery after wasing, will be that the remaining washing liquid in surface of battery is dried, so can ensure the surface dryness of battery, and then guarantee the fashioned planarization of insulating protective coating effectively.
And S300, carrying out electrostatic spraying operation on the dried battery by adopting insulating paint.
In this embodiment, the battery is subjected to electrostatic spraying operation by using the insulating paint, that is, the insulating paint with charges is uniformly adsorbed on the casing of the battery under the action of electrostatic force, so that the problem of occurrence of bubbles can be effectively avoided. In addition, in the electrostatic spraying process, only the position which is not required to be insulated is covered by a template, and the rest areas are not overlapped areas similar to films after electrostatic spraying.
And S400, performing curing operation on the sprayed battery, so that an insulating protective coating is formed on the shell of the battery.
In this embodiment, through carrying out the solidification operation to the battery after the spraying, make insulating coating form even, continuous, level and smooth insulating protective coating after the solidification on the battery casing, not only can shorten the production time of battery, but also can promote the yields of battery effectively.
In one embodiment, the specific operation steps of the cleaning operation for the battery are as follows:
and adopting hot water to clean the battery.
It should be noted that, adopt hot water to wash the surface of battery, hot water sprays on the battery casing promptly for dust or foreign matter on the battery casing wash away along with rivers, so can ensure the clean and tidy degree on battery casing surface, avoid dust or foreign matter to cause insulating protective coating shaping unevenness effectively, and then can ensure that insulating protective coating shaping has better roughness on the battery casing.
In one embodiment, the water temperature of the hot water is 35 ℃ to 50 ℃.
It should be noted that the temperature of the hot water is controlled between 35 ℃ and 50 ℃, so that dust or foreign matters on the surface of the battery can be cleaned to a greater extent, and the surface of the battery shell can keep better neatness and flatness, so that the insulating protective coating can be ensured to be molded on the battery shell to have better flatness.
In one embodiment, the specific operation steps of the drying operation of the cleaned battery are as follows:
and drying the battery by hot air.
It should be noted that, hot air is blown to the battery case, so that the residual moisture on the battery case is dried by hot air, thereby ensuring the dryness of the surface of the battery case, and facilitating the subsequent process.
In one embodiment, the temperature of the hot air is 110 ℃ to 140 ℃.
The temperature of the hot air is controlled between 110 ℃ and 140 ℃, and residual moisture on the surface of the battery shell can be dried to a large extent on the premise of not affecting the performance of the battery, so that the battery shell keeps good dryness, and the insulation protective coating can be ensured to be formed on the battery shell to have good flatness and continuity.
Referring to fig. 2, in one embodiment, the steps of performing electrostatic spraying operation on the dried battery by using the insulating paint are as follows:
s301, performing heating fluidization operation on the insulating paint to obtain a fluid insulating paint;
s302, electrifying the fluid insulating paint to obtain electrified insulating paint;
and S303, carrying out atomization spraying operation on the charged insulating paint, so that the insulating protective coating is formed on the shell of the battery.
The insulating paint is fluidized by heating the insulating paint to form a fluid insulating paint so that the insulating paint flows. Then, the fluid insulating paint is subjected to an electrification operation to form a charged insulating paint even if the insulating paint is charged. Finally, the charged insulating paint is atomized and then sprayed on the battery shell, and the insulating paint is uniformly adsorbed on the battery shell under the action of electrostatic force, so that the insulating protective coating formed by curing the insulating paint is more uniform, continuous, smooth and smooth, and the yield of the battery is effectively improved.
In one embodiment, the specific operation steps of the heating and fluidizing operation for the insulating paint are as follows:
the insulating paint in the paint pond is heated to obtain the fluid insulating paint.
The paint pool is a place for storing the insulating paint, and the insulating paint in the paint pool is heated and fluidized to form fluid insulating paint by heating the paint pool, so that the insulating paint can be transported conveniently.
In one embodiment, the heating temperature of the heated fluidization operation is from 100 ℃ to 200 ℃. The insulating coating can be fluidized to form a fluid insulating coating at the heating temperature of 100-200 ℃, and the fluid insulating coating is convenient to transport and transfer and can be quickly transferred to the next process, so that the spraying time is effectively shortened, the production time of a battery is further effectively shortened, and the production efficiency of the battery is further improved.
In one embodiment, the specific operation steps of applying electricity to the fluid insulating paint are as follows:
and applying voltage to the fluid insulating paint through a high-voltage device to obtain the charged insulating paint.
It should be noted that, the fluid insulating paint is pressurized by the high-voltage device, so that the insulating paint is negatively charged, and then the charged insulating paint can be uniformly adsorbed on the surface of the battery shell under the action of electrostatic force, so that the insulating paint can be ensured to have better uniformity, better continuity, better flatness and better smoothness after being molded, and the yield of the battery is effectively improved.
In one embodiment, the voltage value is 10kv to 110kv. The voltage value applied is controlled between 10kv and 110kv, so that the insulating coating can be uniformly adsorbed on the battery shell, further, the formed insulating protective coating has better uniformity, better continuity, better flatness and better smoothness, and the yield of the battery is further improved.
In one embodiment, after the step of obtaining a fluid-like insulating paint by heating the insulating paint in the paint bath and before the step of obtaining the charged insulating paint by applying a voltage to the fluid-like insulating paint by a high-voltage device, the method further comprises the steps of:
firstly, inputting compressed air into a transportation pipeline to form a negative pressure state in the transportation pipeline;
the fluid paint is then transported through the transport conduit.
It should be noted that, in flowing into the transportation pipeline through compressed air for form negative pressure state in the transportation pipeline, make fluid form insulating coating transfer to the region of giving electricity through transportation pipeline fast and carry out the operation of giving electricity, transfer charged insulating coating to the region of atomizing spraying through transportation pipeline fast again and carry out the atomizing spraying operation, so can transfer insulating coating fast, thereby can shorten the production time of battery effectively, and then promoted the production efficiency of battery effectively. Further, the charged insulating coating can be uniformly adsorbed on the surface of the battery shell under the action of electrostatic force and compressed air, so that the insulating protective coating can be ensured to have good uniformity, good continuity, good flatness and good smoothness after being molded, and the yield of the battery is effectively improved.
In one embodiment, the flow rate of the compressed air is 5 m/s-30 m/s, and the air pressure of the compressed air is 0.7 MPa-10 MPa. The flow rate of the compressed air is 5m/s to 30m/s and the air pressure is 0.7MPa to 10MPa, so that the negative pressure state can be formed in the conveying pipeline, and the fluid insulating paint can be conveyed. Further, under the action of the flow rate of compressed air being 5 m/s-30 m/s and the air pressure being 0.7 MPa-10 MPa, the insulating coating can be quickly and uniformly attached to the surface of the battery shell under the action of electrostatic force, so that the insulating protective coating after being formed has good uniformity, good continuity, good flatness and good smoothness, and the yield of the battery is further improved.
Referring to fig. 3, in one embodiment, the specific operation steps of performing the atomized spraying operation on the charged insulating coating are:
s303a, placing a battery in a processing clamp, and leading the processing clamp to be positively charged with high voltage;
s303b, introducing high-voltage negative electricity into a spray head of an atomization device to enable the processing clamp and the atomization device to form an electrostatic field;
and S303c, spraying the charged insulating paint on the battery shell through a spray head of the atomizing device.
The battery case is first positively charged by placing the battery in a processing jig and charging the processing jig with high voltage positive electricity. Then, the nozzle of the atomizing device is electrified with high-voltage negative electricity, so that an electrostatic field is formed between the processing clamp and the atomizing device, and the insulating paint with negative charges can be sprayed out of the atomizing device rapidly under the action of electrostatic repulsive force (like-property mutual exclusion) of the electrostatic field and compressed air. And the insulating paint with negative charge can be uniformly adsorbed on the battery shell under the action of electrostatic adsorption force (opposite attraction) of the electrostatic field and compressed air. Therefore, the production time of the battery can be effectively shortened, and the insulating protective coating has good uniformity, good continuity, good flatness and good smoothness after being formed, so that the production efficiency and the yield of the battery are effectively improved.
In one embodiment, the atomizing speed of the atomizing device is 5 m/s-30 m/s. It should be noted that, between the atomizing spraying speed of 5m/s ~ 30m/s, can make atomizing device spray out insulating coating towards the processing anchor clamps fast and evenly, under the effect of cooperation electrostatic force and compressed air for insulating coating can be fast and evenly attached to the surface of battery case, and then make insulating protective coating shaping after having better homogeneity, better continuity, better planarization and better smoothness, thereby promote the production efficiency and the yields of battery effectively.
Referring to fig. 4, the present application further provides an electrostatic spraying apparatus 10, which includes a paint tank 100, a transportation pipeline 200, a high-pressure device 300, an atomizing device 400, and a processing fixture 500, wherein a storage cavity 102 is formed in the paint tank 100, a heating device (not shown) is disposed in the paint tank 100, the paint tank 100 is communicated with one end of the transportation pipeline 200, the transportation pipeline 200 is provided with a vent 202, the vent 202 is used for externally connecting a compressed air source, the high-pressure device 300 is disposed on the transportation pipeline 200, the atomizing device 400 is communicated with the other end of the transportation pipeline 200, and a nozzle of the atomizing device 400 is disposed towards the processing fixture 500.
In this embodiment, the insulating paint is stored in the storage chamber 102 of the paint tank 100, and the insulating paint is heated and fluidized by controlling the heating means to form a fluid-like insulating paint. Compressed air is then introduced into the air vent 202 to bring the transport conduit 200 into a negative pressure state so that the fluid-like insulating paint can be transported from the paint reservoir 100 to the atomizing device 400 through the transport conduit 200. And the fluid-like insulating paint in the transport pipe 200 is pressurized by the high voltage device 300 during transportation to obtain the negatively charged insulating paint. Further, the battery is placed in the processing clamp 500, the processing clamp 500 is charged with high-voltage positive electricity, and then the nozzle of the atomizing device 400 is charged with high-voltage negative electricity, so that the processing clamp 500 and the atomizing device 400 form an electrostatic field, and the insulating paint with negative charge can be rapidly sprayed out of the atomizing device 400 under the action of electrostatic repulsive force of the electrostatic field and compressed air. Since the spray head of the atomizing device 400 is disposed toward the processing jig 500 and under the electrostatic adsorption force of the electrostatic field and the compressed air, the negatively charged insulating paint can be uniformly adsorbed on the battery case. Therefore, the production time of the battery can be effectively shortened, and the insulating protective coating has good uniformity, good continuity, good flatness and good smoothness after being formed, so that the production efficiency and the yield of the battery are effectively improved.
As shown in fig. 4, in one embodiment, the electrostatic spraying apparatus 10 further includes a paint recovery tank 600 and a recovery pipe 700, the paint recovery tank 600 is disposed directly under the processing jig 500, the paint recovery tank 600 communicates with one end of the recovery pipe 700, and the other end of the recovery pipe 700 communicates with the paint tank 100. It will be appreciated that in the spraying process, part of the insulating paint is not adsorbed on the battery case and falls on the ground, in order to avoid wasting the insulating paint, the paint recovery tank 600 is disposed under the processing fixture 500, so that the insulating paint can be effectively recovered, and the recovered insulating paint is returned to the paint tank 100 for recycling through the recovery pipeline 700, so that the utilization rate of the material can be effectively improved.
In one embodiment, the atomizing device is one of an ultrasonic atomizer, a compression atomizer, or a mesh atomizer. It can be understood that ultrasonic atomizer, compression atomizer or net atomizer all can make electrified insulating coating atomizing and evenly spray electrified insulating coating on the battery casing in the processing anchor clamps, combine electrostatic force and compressed air's effect simultaneously down, electrified insulating coating can adsorb on the battery casing fast and evenly, so make insulating protective coating have better homogeneity, better continuity, better planarization and better smoothness after the shaping to promote the production efficiency and the yields of battery effectively.
The application also provides an insulating protective coating, which is prepared by adopting the preparation method of the insulating protective coating for the battery in any embodiment;
the insulating protective coating comprises the following components in parts by mass:
10-80 parts of a first high molecular polymer;
10-80 parts of a second high molecular polymer;
5-10 parts of inorganic filler.
In this embodiment, the insulating protection layer formed by combining the first high polymer and the second high polymer has better electrical insulation performance and better high temperature resistance, and the first high polymer has better cohesiveness and better dispersibility, and combines the preparation mode of electrostatic spraying. The battery surface is provided with the insulating protective coating layer with good uniformity, good continuity, good flatness and good smoothness, so that the yield of the battery can be effectively improved.
It should also be noted that the inorganic filler is capable of coloring the insulating protective coating.
In one embodiment, the insulating protective coating preferably comprises the following components in parts by mass:
30-50 parts of a first high molecular polymer;
40-60 parts of a second high molecular polymer;
5-8 parts of inorganic filler.
It should be noted that under the distribution of the mass portions, each component is dispersed more uniformly in the system, so that the insulating protection layer can be ensured to have better insulating performance, and meanwhile, the uniformity, the continuity, the flatness and the smoothness of the surface of the insulating protection layer after molding are further improved, and the yield of the battery is further improved.
In one embodiment, the first high molecular polymer includes polyamide, polyimide, polyacrylic acid, polyacrylate, polyacrylamide and epoxy resin.
The polyamide can improve the abrasion resistance, weather resistance and corrosion resistance of the insulating protective layer. The polyimide improves the electrical insulation property and the high temperature resistance of the insulating protection layer. As the polyacrylic acid has better dispersing effect, the components can be more uniformly dispersed under the action of the polyacrylic acid. And the polypropylene ester can promote the flexibility of the insulating protective film. The polyacrylamide plays a role of a flocculating agent in the system, so that the insulating coating can form a glue solution in the preparation process. The epoxy resin has better cohesiveness and insulativity, and can form uniform and continuous insulating paint under the action of the epoxy resin and polyacrylic acid. Therefore, under the synergistic effect of the components, the first high-molecular polymer enables the insulating protection layer formed by molding the insulating coating to have better uniformity, better continuity and better flatness, and meanwhile, the adhesive force between the insulating protection layer and the battery shell can be effectively improved, so that the yield of the battery is effectively improved.
In one embodiment, the second high molecular polymer includes polyvinylidene fluoride, polytetrafluoroethylene, polyethylene and polypropylene.
It should be noted that, polyvinylidene fluoride not only has better cohesiveness, but also has better low flammability and electrical insulation property, that is, polyvinylidene fluoride not only can effectively promote the cohesiveness of the insulating protection layer and the battery case, but also can promote the electrical insulation property and fireproof property of the insulating protection layer. Polytetrafluoroethylene has a high lubrication property, so that the insulating protective layer has a high smoothness when formed. The polyethylene has better electrical insulation and better corrosion resistance, so that the electrical insulation performance and corrosion resistance of the insulating protection layer are effectively improved, and the polypropylene can also improve the electrical insulation performance of the insulating protection layer. Therefore, under the synergistic effect of the components, the second high molecular polymer can effectively improve the adhesive force, the electrical insulation performance and the smoothness of the insulating protective layer, so that the yield of the battery is effectively improved.
In one embodiment, the inorganic filler is one or more of silicon dioxide, zirconium oxide, aluminum oxide and titanium oxide. It will be appreciated that the inorganic filler is capable of coloring the insulating protective layer.
In order to verify the authenticity of the method for preparing the insulating protective coating for a battery according to the present application, fig. 5 is a schematic view of a battery in which the battery is insulated and coated using a conventional coating process, and fig. 6 is a schematic view of a battery in which the battery is insulated and coated using the method for preparing the insulating protective coating for a battery according to the present application.
As can be seen from fig. 5, there is an overlap region on the film of the battery case.
As can be seen from fig. 6, the insulating protective layer of the battery case does not have an overlap region.
Compared with the prior art, the application has at least the following advantages:
1. according to the preparation method of the insulating protective coating for the battery, the battery is firstly cleaned, namely the surface of the battery is cleaned, so that foreign matters on the surface of the battery are removed, and the cleanliness of the surface of the battery can be ensured. Secondly, the battery is dried, so that the dryness of the surface of the battery can be ensured, and the follow-up spraying operation is convenient to carry out. Then, the battery is subjected to electrostatic spraying operation by adopting the insulating paint, namely the insulating paint with charges is uniformly adsorbed on the shell of the battery under the action of electrostatic force, so that the problem of bubbles can be effectively avoided. In addition, in the electrostatic spraying process, only the position which is not required to be insulated is covered by the template, and the rest areas are not overlapped after electrostatic spraying. Finally, the battery is cured, namely, the insulating coating forms a uniform, continuous, flat and smooth insulating protective coating after being cured on the shell of the battery.
2. Compared with the traditional film pasting technology, the preparation method of the insulating protective coating for the battery disclosed by the application has the advantages that the insulating coating can be uniformly adsorbed on the shell of the battery by utilizing the action of electrostatic force, the laminating precision of the insulating protective coating can be met, the production time of the battery can be shortened to a greater extent, and the production efficiency of the battery is effectively improved.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method for preparing an insulating protective coating for a battery, comprising the steps of:
performing a cleaning operation on the battery;
drying the cleaned battery;
carrying out electrostatic spraying operation on the dried battery by adopting insulating paint;
and (3) performing curing operation on the sprayed battery, so that an insulating protective coating is formed on the shell of the battery.
2. The method for preparing an insulating protective coating for a battery according to claim 1, wherein the specific operation steps of washing the battery are as follows:
and adopting hot water to clean the battery.
3. The method for preparing an insulating protective coating for a battery according to claim 2, wherein the water temperature of the hot water is 35 ℃ to 50 ℃.
4. The method for preparing an insulating protective coating for a battery according to claim 1, wherein the specific operation steps of drying the washed battery are as follows:
and drying the battery by hot air.
5. The method for producing an insulating protective coating for a battery according to claim 4, wherein the temperature of the hot air is 110 ℃ to 140 ℃.
6. The method for preparing an insulating protective coating for a battery according to claim 1, wherein the specific operation steps of performing electrostatic spraying operation on the dried battery using an insulating coating material are as follows:
heating and fluidizing the insulating paint to obtain fluid insulating paint;
electrifying the fluid insulating paint to obtain electrified insulating paint;
and carrying out atomization spraying operation on the charged insulating coating so that the insulating protective coating is formed on the shell of the battery.
7. The method for producing an insulating protective coating for a battery according to claim 6, wherein the heating temperature of the heating fluidization operation is 100 ℃ to 200 ℃.
8. The method for preparing an insulating protective coating for a battery according to claim 6, wherein the specific operation steps of applying electricity to the fluid-like insulating coating are as follows:
and applying voltage to the fluid insulating paint through a high-voltage device to obtain the charged insulating paint.
9. The method for producing an insulating protective coating for a battery according to claim 8, wherein the voltage value is 10kv to 110kv.
10. An insulating protective coating, characterized in that it is prepared by the method for preparing an insulating protective coating for a battery according to any one of claims 1 to 9.
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