CN115512966A - Capacitor core, capacitor and manufacturing method - Google Patents

Capacitor core, capacitor and manufacturing method Download PDF

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Publication number
CN115512966A
CN115512966A CN202211356457.7A CN202211356457A CN115512966A CN 115512966 A CN115512966 A CN 115512966A CN 202211356457 A CN202211356457 A CN 202211356457A CN 115512966 A CN115512966 A CN 115512966A
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CN
China
Prior art keywords
cathode layer
capacitor
negative electrode
coating process
foil
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Pending
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CN202211356457.7A
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Chinese (zh)
Inventor
袁家印
王艳
陈琛
陈绪鑫
靳博
王涛
李如升
韩庭
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State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
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State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
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Application filed by State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd filed Critical State Run Factory 4326 of China Zhenhua Group Xinyun Electronic Comp and Dev Co Ltd
Priority to CN202211356457.7A priority Critical patent/CN115512966A/en
Publication of CN115512966A publication Critical patent/CN115512966A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/005—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/224—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/228—Terminals
    • H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/30—Stacked capacitors

Abstract

The utility model provides a capacitor core, a capacitor and a manufacturing method, relating to the field of capacitor manufacturing. The manufacturing method of the capacitor core comprises the following steps: obtaining an electrode foil, wherein the electrode foil comprises a positive electrode area and a negative electrode area which are mutually isolated; generating a cathode layer on the surface of the negative electrode area by using a spraying process and/or a roll coating process to obtain the capacitor core; wherein the cathode layer comprises one or more of an electrolyte layer, a graphite layer and a silver paste layer. The method can ensure that the generated cathode layer has uniform thickness and is not easy to bubble when being applied to the manufacture of the large-size capacitor through the spraying process and/or the rolling coating process, thereby reducing the manufacture cost of the large-size capacitor.

Description

Capacitor core, capacitor and manufacturing method
Technical Field
The application relates to the field of capacitor manufacturing, in particular to a capacitor core, a capacitor and a manufacturing method.
Background
The core area of the large-size chip type laminated capacitor exceeds 100cm 2 The chip type laminated capacitor of (1). When a large-sized solid electrolyte sheet type laminated capacitor is manufactured, the manufacturing of the large-sized capacitor is difficult and costly due to the limitation of the current manufacturing process.
For example, at present, a cathode layer is generally generated on the surface of a capacitor core by using an impregnation method, and when the capacitor core of a large-size capacitor is impregnated, the conditions of uneven thickness, foaming and the like are easy to occur, so that the manufactured capacitor core has defects and cannot be used for manufacturing the large-size capacitor. Meanwhile, the large-sized capacitor core needs a corresponding-sized dipping tank and a large amount of cathode solution for dipping, so that the manufacturing cost of the large-sized capacitor is high.
Disclosure of Invention
In view of this, the present application aims to provide a capacitor core, a capacitor and a manufacturing method thereof, so as to reduce the manufacturing difficulty and cost of the capacitor.
In a first aspect, an embodiment of the present application provides a method for manufacturing a capacitor core, including: obtaining an electrode foil, wherein the electrode foil comprises a positive electrode area and a negative electrode area which are mutually isolated; generating a cathode layer on the surface of the negative electrode area by using a spraying process and/or a roll coating process to obtain the capacitor core; wherein the cathode layer comprises one or more of an electrolyte layer, a graphite layer and a silver paste layer.
According to the technical scheme, when the capacitor core is applied to manufacturing of a large-size capacitor, the cathode layer is generated on the surface of the negative electrode area of the electrode foil by using the spraying process and/or the rolling coating process, compared with the dipping process, the spraying process and/or the rolling coating process can avoid the problems of unevenness, foaming and the like of the cathode layer generated on the surface of the electrode foil, the qualification rate is improved, and the manufacturing difficulty and the manufacturing cost of the large-size capacitor are reduced. When the cathode layer is applied to the manufacture of the capacitor core of the capacitor with the conventional size, the cathode layer with good effect can be obtained, and the manufacture requirement of the capacitor core of the capacitor with the conventional size can be met.
In an embodiment, before the cathode layer is generated on the surface of the anode region by using a spray coating process and/or a roll coating process, the method further includes: generating the cathode layer on the surface of the negative electrode area by using a coating process corresponding to the viscosity of the cathode layer solution based on a first preset relation between the viscosity of the cathode layer solution and the coating process and the viscosity of the cathode layer solution; wherein the coating process comprises a spray coating process and the roll coating process.
It can be understood that different cathode layer solutions have different viscosities, the requirements for the coating uniformity of the cathode layer solutions with different viscosities are different, and the coating effects and efficiencies of the spraying process and the roll coating process for coating the cathode layer solutions with different viscosities and generating the cathode layer are different. Therefore, in the embodiment of the present application, based on the first preset relationship between the viscosity of the cathode layer solution and the coating process and the viscosity of the cathode layer solution, the coating process corresponding to the viscosity of the cathode layer solution may be determined, and the coating process corresponding to the viscosity may be used to improve the efficiency of generating the cathode layer while ensuring the effect of generating the cathode layer.
In one embodiment, the generating the cathode layer on the surface of the negative electrode region by using a coating process corresponding to the viscosity of the cathode layer solution includes: when the viscosity of the cathode layer solution is determined to be larger than a preset viscosity threshold value, generating the cathode layer on the surface of the negative electrode area by using the roll coating process; and/or when the viscosity of the cathode layer solution is determined to be less than or equal to the preset viscosity threshold value, generating the cathode layer on the surface of the negative electrode area by using the spraying process.
It will be appreciated that for cathode layer solutions having a viscosity above a predetermined viscosity threshold, the roll coating process has a better coating effect than the spray coating process, resulting in a more uniform cathode layer. For the cathode layer solution with the viscosity less than or equal to the preset viscosity threshold value, the generated cathode layer is ensured to be uniform, and meanwhile, the spraying process has higher efficiency compared with the roll coating process. Therefore, the mode can ensure that the generated cathode layer is uniform, and simultaneously improve the efficiency of generating the cathode layer, thereby improving the manufacturing efficiency of the capacitor core.
In one embodiment, the roll coating process is a process of coating the surface of the negative electrode region by using a roller to generate the cathode layer; before the cathode layer is generated on the surface of the negative electrode area by using a roll coating process, the method further comprises the following steps: and determining the roller material corresponding to the viscosity of the cathode layer solution based on the viscosity of the cathode layer solution and a second preset relation between the viscosity of the cathode layer solution and the roller material, so as to coat the surface of the negative electrode area by using the roller with the roller material to generate the cathode layer.
It can be understood that the roller made of the same material is coated with the cathode layer solution with different viscosity to generate the cathode layer, and the consumption of the cathode layer solution is different, therefore, when the cathode layer is generated by using the roll coating process, the roller made of the corresponding roller material can be selected and used according to the viscosity of the cathode layer solution, so that the coating of the cathode layer solution is more uniform, the consumption of the cathode layer solution is reduced, and the manufacturing cost of the capacitor core is reduced.
In one embodiment, the extraction electrode foil comprises: and cutting the substrate of the electrode foil by using a cutting process corresponding to the target shape based on a third preset relation between the shape of the electrode foil and the cutting process of the electrode foil and the target shape of the electrode foil to obtain the electrode foil with the target shape.
In the embodiments of the present application, the capacitor core may be manufactured using an electrode foil of an arbitrary shape. However, different cutting processes have different cutting efficiencies and costs for different shapes of electrode foils. Based on the third preset relation between the shape of the electrode foil and the cutting process of the electrode foil and the target shape of the electrode foil, the cutting process corresponding to the target shape can be determined, the cutting process is used for cutting the substrate of the electrode foil, and the cutting cost can be reduced while the cutting efficiency is high.
In one embodiment, the area of the electrode foil is larger than a predetermined area threshold.
In the embodiment of the application, the preset area threshold value is reasonably set, so that the capacitor core manufacturing method provided by the application can be applied to manufacturing of large-size capacitors, and compared with the prior art, the capacitor core manufactured by the method provided by the application can effectively avoid the problems of uneven coating thickness of an electrolyte layer and easiness in foaming, and reduce the manufacturing cost of the large-size capacitors.
In one embodiment, after the obtaining the electrode foil, the method further comprises: and coating a protective layer on the weak part of the negative electrode area, wherein the protective layer is made of an insulating material.
It can be understood that defects such as defects and burrs may exist on the surface of the electrode foil in the production process of the capacitor core, and the defects are prone to charge accumulation and the like, so that the defects are weak, electrical performance is affected, and breakdown and the like occur. In the above mode of the embodiment of the application, the weak part of the cathode region is coated with the protective layer, so that adverse effects of the weak part on the electrical property of the capacitor core can be avoided, and the breakdown voltage of the capacitor core is improved.
In a second aspect, an embodiment of the present application provides a capacitor core, including: an electrode foil including a positive electrode region and a negative electrode region separated from each other; the electrode foil surface has a cathode layer produced by a roll coating process and/or a spray coating process.
In a third aspect, an embodiment of the present application provides a capacitor manufacturing method, including: obtaining a plurality of capacitor cores manufactured based on the capacitor core manufacturing method according to any one of the first aspect; stacking a plurality of the capacitor cores to obtain a stacked body; in the stacked body, regions of the same polarity between different ones of the capacitor cores overlap; the electrodes are connected to regions of different polarities of the stacked body using different electrode leads, respectively, to obtain the capacitor.
In one embodiment, before the connecting with the regions of different polarities of the stack using the different electrode leads, respectively, the method includes: connecting with the negative electrode region of the stacked body using a negative electrode lead-out foil; the negative electrode lead-out foil is of a sheet structure and is made of a conductive material.
In the embodiment of the application, the negative electrode extraction foil which is of a sheet structure and is made of a conductive material is used for extracting the negative electrode area of the stacked body, and the sheet structure can enable the negative electrode extraction foil and the negative electrode area of the stacked body to have a larger contact area, so that the conductive performance between the negative electrode extraction foil and the negative electrode area of the stacked body is improved, and the equivalent series resistance is reduced.
In one embodiment, after the connecting with the regions of different polarities of the stacked body using the different electrode leads, respectively, the method further includes: the stack is secured using a rigid insulating plate.
It can be understood that when the capacitor core area is great, the capacitor core is easy to be bent by external force, so that the performance of the capacitor is influenced, therefore, in the scheme of the embodiment of the application, the stacked body is fixed by using the hard insulating plate, the capacitor core is not easy to deform, and the capacity of the capacitor for resisting the influence of external force is improved.
In an embodiment, after obtaining the capacitor, the method further includes: the capacitor is encapsulated with an insulating moisture-proof encapsulating material.
In the embodiment of the application, after the capacitor is packaged by using the insulating and moisture-proof packaging material, the insulativity and the moisture resistance of the capacitor can be improved, and the use scene of the capacitor is widened.
In a fourth aspect, an embodiment of the present application provides a capacitor, including: a stacked body including a plurality of capacitor cores manufactured based on the method according to any one of the first aspect, and regions of the same polarity between different capacitor cores overlap; and a plurality of leads respectively connected to regions of different polarities in the stacked body.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the above-described techniques of the disclosure.
In order to make the aforementioned and other objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an electrode foil provided in an embodiment of the present application;
FIG. 2 is a cross-sectional view of a capacitor core provided in an embodiment of the present application;
FIG. 3 is a flow chart of a method of manufacturing a capacitor core according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a stacked body provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a capacitor provided in an embodiment of the present application;
fig. 6 is a flowchart of a method for manufacturing a capacitor according to an embodiment of the present disclosure.
Icon: an electrode foil 11; a negative electrode region 111; a positive electrode region 112; an electrolyte layer 12; a graphite layer 13; a silver paste layer 14; an isolation layer 15; a protective layer 16; a negative electrode lead 21; a positive electrode lead 22; and a negative electrode lead foil 23.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The application provides a capacitor core, includes: an electrode foil and a cathode layer. Wherein:
and an electrode foil including a positive electrode region and a negative electrode region isolated from each other, the negative electrode region being for coating the cathode layer. For example, reference may be made to fig. 1, where fig. 1 is a schematic structural diagram of an alternative electrode foil provided in an embodiment of the present application, but not by way of limitation.
In the embodiment of the present application, the shape of the electrode foil may be any shape, and the shape shown in fig. 1 is only an example and should not be a limitation to the present application, and in an actual manufacturing process, the electrode foil may be other shapes, for example, a circle, a circular ring, any polygon, and the like.
In the embodiment of the present application, the area of the electrode foil can be reasonably set according to the requirement, and for example, the area of the electrode foil can exceed 100cm 2 。
In one embodiment, the positive and negative electrode regions of the electrode foil are separated by a separator to prevent shorting between the positive and negative electrode regions after the capacitor is formed. The thickness range of the isolating layer is 10-1000 microns, the isolating layer in the thickness range can better isolate the positive electrode region from the negative electrode region, the condition that isolation cannot be achieved due to too small thickness is avoided, and meanwhile the condition that too large thickness causes too much adverse effect on the thickness of the capacitor core is avoided. The isolation layer can be silica gel, resin, adhesive tape or other substances with insulating effect.
In one embodiment, the edge of the negative electrode region of the electrode foil is further coated with a protective layer.
It can be understood that the edge of the electrode foil may have a weak portion caused by cutting remaining burrs, deformation and other defects, and the weak portion may have charge accumulation, point discharge and other conditions, which affect the leakage current and the breakdown voltage. After the protective layer is coated on the edge of the cathode region, the protective layer can prevent the weak part from contacting the cathode layer, so that the qualification rate of the capacitor core and the capacitor can be improved, and the breakdown voltage and the reliability of the manufactured capacitor can be improved.
The protective layer can be silica gel, resin, adhesive tape or other substances with insulating effect, the thickness of the protective layer can be reasonably set according to the actual conditions of materials and weak parts and the manufacturing process, the protective layer is not limited here, and the protective effect is achieved.
Referring to fig. 2, fig. 2 is a cross-sectional view of a capacitor core provided in an embodiment of the present application, the capacitor core including:
and the cathode layer is coated on the surface of the electrode foil, outwards from the electrode foil and sequentially comprises an electrolyte layer, a graphite layer and a silver paste layer.
In this embodiment, the cathode layer may be produced by a roll coating process and/or a spray coating process to reduce the risk of non-uniformity, blistering, etc.
In some alternative embodiments, the cathode layer includes at least an electrolyte layer, and the graphite layer and the silver paste layer are provided as required.
Next, a method of manufacturing the capacitor core will be described in detail.
Referring to fig. 3, fig. 3 is a flowchart of a method for manufacturing a capacitor core according to an embodiment of the present application, the method for manufacturing a capacitor core includes:
s110, obtaining an electrode foil, wherein the electrode foil comprises a positive electrode area and a negative electrode area which are separated from each other.
The electrode foil can be obtained by cutting the substrate of the electrode foil through cutting processes such as mechanical cutting, die punching or laser cutting. The substrate of the electrode foil may be a metal foil of an anode metal, and the anode metal may be aluminum, tantalum, or the like.
In one embodiment, based on a third preset relationship between the shape of the electrode foil and the cutting process of the electrode foil and the target shape of the electrode foil, the substrate of the electrode foil is cut by using the cutting process corresponding to the target shape, so as to obtain the electrode foil with the target shape.
In this embodiment, the electrode foil may have any shape.
It will be appreciated that different cutting processes have different operating efficiencies and costs. For example, die punching can cut electrode foils in the same shape as the die faster, but the die requires time and is more expensive to produce, and when the die does not have the required shape, the use of mechanical cutting or laser cutting is more efficient and less expensive. Further, mechanical dicing is more efficient and less costly than laser dicing, but mechanical dicing is generally linear dicing and it is difficult to cut a shape having a characteristic such as a circular shape or an arc shape or another special shape, and therefore, it is more efficient to use laser dicing.
Therefore, when the substrate of the electrode foil is cut, a cutting process corresponding to the target shape of the electrode foil can be selected for cutting through a third preset relation between the preset shape of the electrode foil and the electrode foil cutting process.
For example, die cutting may be used if the target shape already has a corresponding die. If the target shape is a more regular shape with more distinct linear features, such as regular polygons, trapezoids, or the shape shown in fig. 1, etc., mechanical cutting may be used. If the target shape is an irregular shape or has non-linear features such as circular rings, circular arcs and the like, and no corresponding mold is provided, the electrode foil with the corresponding shape can be obtained by using a laser cutting mode.
It should be understood that the above description is only an example, and should not be a limitation to the present application, and in the actual manufacturing process, there may be a relationship between other shapes of the electrode foil and the cutting process, or other cutting processes may be used, and all of the shapes may be reasonably selected according to needs in the actual manufacturing process, and are not described herein again. The specific principles and implementation manners of mechanical cutting, die cutting and laser cutting may refer to the prior art, and are not described herein again.
In this embodiment, after the electrode foil is obtained by cutting, a pretreatment may also be performed. The pretreatment may include welding, formation, heat treatment, and the like.
Illustratively, the preprocessing process in an embodiment may include: after the electrode foil is obtained firstly, the electrode foil can be welded on the stainless steel strip, so that the mass production is facilitated; immersing the electrode foil welded on the steel strip into the formation liquid and electrifying to carry out formation treatment so as to repair the defects caused by cutting; placing the electrode foil subjected to the formation treatment into an oven for heat treatment so as to dry the formation liquid on the surface; and finally, putting the electrode foil into the formation liquid, and performing second formation treatment to further repair the defects.
It is to be understood that the above pre-processing process is only an example, and the processing manner and sequence of the pre-processing may be reasonably set according to the requirement in the actual manufacturing process, and the specific pre-processing process may refer to the prior art and is not expanded herein.
In one embodiment, after the electrode foil is accessed, a separator layer may be applied where the positive and negative regions meet.
As shown in fig. 1, in this embodiment, the sizes of the positive electrode region and the negative electrode region may be reasonably set according to the preset performance of the capacitor and other materials, and the specific setting process may refer to the prior art. After the positive electrode area and the negative electrode area are determined, the joint can be coated with the isolating layer.
In this embodiment, the electrode foil coated with the isolation layer may be a pretreated electrode foil. The isolating layer can be coated by any one of dipping, spraying, rolling or brushing, and the isolating layer can be made of silica gel, resin, adhesive tape or other substances with insulating effect. The thickness range of the coated isolating layer can be between 10 mu m and 1000 mu m, and the isolating between the positive electrode area and the negative electrode area can be realized.
In one embodiment, after the electrode foil is obtained, a protective layer may be further applied to the weak portion of the negative electrode region.
As described above, the electrode foil may have flaws when cut, which may cause weak portions, which are one of the main causes of affecting the electrical performance, and therefore, the protective layer may be applied to the weak portions of the negative electrode region, for example, the edge of the negative electrode region.
In the embodiment, after the protective layer is coated on the weak part of the negative electrode area, the weak part and the cathode layer can be isolated, and the negative influence of the weak part on the electrical property is avoided. The material of the protective layer can be silica gel, resin, adhesive tape or other substances with insulating effect.
In this embodiment, the flaw can be covered completely to the protective layer, consequently, the thickness and the width of protective layer can carry out reasonable setting as required, do not give unnecessary detail here.
S120, generating a cathode layer on the surface of the negative electrode area by using a spraying process and/or a roll coating process to obtain a capacitor core; wherein the cathode layer comprises one or more of an electrolyte layer, a graphite layer and a silver paste layer.
In this embodiment, an insulating metal oxide film is formed on the surface of the electrode foil, after the electrolyte layer covers the surface of the electrode foil, the electrolyte layer may form a capacitor with the anode metal inside the electrode foil, and the graphite layer and the silver paste layer are used to enhance conductivity. Therefore, as an alternative embodiment, the cathode layer includes at least the electrolyte layer, and the graphite layer and the silver paste layer may be arranged as appropriate according to the needs.
In this embodiment, the coating process of the cathode layer includes a spray coating process and a roll coating process. The spraying process is a process of spraying and coating a cathode layer material on the surface of the electrode foil by using a nozzle to generate a cathode layer, and the roll coating process is a process of coating the cathode material on the surface of the electrode foil by using a roller stained with a cathode layer solution to generate the cathode layer.
In this embodiment, when the cathode layer includes a plurality of types of electrolyte layers, graphite layers, and silver paste layers, different layers may be formed by different processes, or may be formed by the same process. For example, when the cathode layer includes an electrolyte layer, a graphite layer, and a silver paste layer, the electrolyte layer may be generated using a spray coating process, the graphite layer may be generated using a spray coating process, and the silver paste layer may be generated using a roll coating process; alternatively, the electrolyte layer, graphite layer and silver paste layer are produced using a roll coating process. It is understood that the above processes are only two alternative embodiments in the examples of the present application by way of example, and are not intended to limit the examples of the present application.
In an embodiment, the coating process of the cathode layer corresponding to the area of the electrode foil may be determined according to the area.
In this embodiment, for the electrode foil with a conventional size, a coating manner of a dipping process may be used, which has advantages of better process effect, lower cost and higher efficiency compared to a spraying process or a roll coating process. Of course, for electrode foils of conventional size, a spray coating process or a roll coating process may also be used.
In the case of a large-sized electrode foil, the coating manner using the dipping process is liable to cause uneven coating of the electrolyte layer in the cathode layer, and foaming, etc. Therefore, in the embodiment of the present application, a spray coating process and/or a roll coating process may be applied to a large-sized electrode foil according to the area of the electrode foil, so that a better process effect is produced by the spray coating process and/or the roll coating process, and the above problems are effectively solved.
That is, in an alternative implementation of the embodiments of the present application, the cathode layer may be generated by using a spray coating process and/or a roll coating process on the electrode foil that is greater than the preset area threshold according to the area of the electrode foil; and generating a cathode layer by using an impregnation process for the electrode foil with the area less than or equal to the preset area threshold.
It should be noted that the capacitor core manufacturing method and the capacitor manufacturing method provided by the present application can be applied to manufacture large-sized capacitors, that is, the area of the electrode foil can be larger than the predetermined area threshold. Currently, the electrode foil area is more than 100cm 2 Is regarded as a large-sized capacitor, and therefore, in the embodiment of the present application, the preset area threshold value may be set to 100cm 2 Or a greater value.
The electrode foil used in this embodiment may have any shape, but since the size of the dipping groove is fixed, the electrode foil having a partial area smaller than the predetermined threshold value but an excessively long length cannot be used as the cathode layer by using the dipping groove, and therefore, in some embodiments, the corresponding coating process may be selected according to the distance from the bottom of the cathode to the separator. For example, when the distance from the bottom of the negative electrode to the separator is greater than 50mm, a spray coating process or a roll coating process is selected, and when the distance from the bottom of the negative electrode to the separator is less than 50mm, a dipping process is selected. The above are merely examples, and may be reasonably adjusted according to various factors such as actual needs, equipment, materials and the like.
Next, the production of the large-sized capacitor core cathode layer will be described in detail.
In one embodiment, before the cathode layer is generated on the surface of the negative electrode area by using a spraying process and/or a rolling process, the cathode layer is generated on the surface of the negative electrode area by using a coating process corresponding to the viscosity of the cathode layer solution based on a first preset relation between the viscosity of the cathode layer solution and the coating process and the viscosity of the cathode layer solution; wherein the coating process comprises a spraying process and a rolling coating process.
There may be different viscosities between the cathode layer solutions, for example, the viscosity of the electrolyte solution used to form the electrolyte layer may be different from the viscosity of the silver paste solution used to form the silver paste layer, or the electrolyte solutions used to form the electrolyte layers for different capacitor elements may have different viscosities. Due to the different viscosities of the cathode layer solutions, the difficulty, cost, etc. of generating uniform cathode layers by different coating processes may be different. For example, in the spraying process, when the cathode layer solution with higher viscosity is sprayed by using a nozzle, the cathode layer solution sprayed by the nozzle on the surface of the electrode foil may not be uniform, and in the roll coating process, the cathode layer solution may be coated back and forth by using a roller, so that the cathode layer solution is more uniformly distributed. Whereas for cathode layer solutions with lower viscosity, the roll coating process is less efficient than the spray coating process.
Thus, in this embodiment, one or more layers in the cathode layer may be determined and generated using a coating process corresponding to the viscosity of the cathode layer solution based on the viscosity of the cathode layer solution and a first predetermined relationship between the magnitude of the viscosity of the cathode layer solution and the coating process. Therefore, the coating process can have good effect between uniform coating and coating efficiency.
In one embodiment, when the viscosity of the cathode layer solution is determined to be greater than a preset viscosity threshold, a cathode layer is generated on the surface of the negative electrode area by using a roll coating process; and/or when the viscosity of the cathode layer solution is determined to be less than or equal to a preset viscosity threshold value, generating a cathode layer on the surface of the negative electrode area by using a spraying process.
In this embodiment, the preset viscosity threshold may be reasonably set according to various factors such as process equipment, the kind or other properties of the cathode layer solution, and the process requirements of the capacitor. Illustratively, in an alternative embodiment, the preset viscosity threshold is 500mpa.s. In some other embodiments, the preset viscosity threshold may be higher or lower, and is not limited herein.
In this embodiment, the electrolyte solution for generating the electrolyte layer, the graphite solution for generating the graphite layer, and the silver paste solution for generating the silver paste layer may have different viscosities, and thus, different coating processes may be used when the electrolyte layer, the graphite layer, and the silver paste layer are generated. For example, a spray coating process is used to form the electrolyte layer and the graphite layer, and a roll coating process is used to form the silver paste layer.
It is understood that, depending on material equipment, etc., in some embodiments, only a spray coating process or a roll coating process may be used during the process of generating the cathode layer, regardless of whether the viscosity of the cathode layer solution is greater than or equal to a predetermined viscosity threshold.
In some embodiments, the cathode layer may be generated using a roll coating process on the surface of the negative electrode region when the viscosity of the cathode layer solution is determined to be greater than a preset viscosity threshold, and the cathode layer may be generated using a dipping process on the surface of the negative electrode region when the viscosity of the cathode layer solution is determined to be equal to or less than the preset viscosity threshold. Or when the viscosity of the cathode layer solution is determined to be less than or equal to a preset viscosity threshold, generating a cathode layer on the surface of the negative electrode area by using a spraying process; and when the viscosity of the cathode layer solution is determined to be larger than a preset viscosity threshold value, generating a cathode layer on the surface of the negative electrode area by using a dipping process.
In the actual production process, the coating process used for generating the cathode layer can be comprehensively considered according to the existing materials, equipment and the like, and different processes can be flexibly used to generate the cathode layer, which is only an example and should not be a limitation to the present application.
In an embodiment, before the cathode layer is generated by using the roll coating process, a roller material having a viscosity corresponding to the viscosity of the cathode layer solution may be determined based on the viscosity of the cathode layer solution and a second preset relationship between the viscosity of the cathode layer solution and the roller material, so as to use the roller having the roller material to perform coating on the surface of the negative electrode area to generate the cathode layer.
In this embodiment, the roller coating process uses a roller for coating, and the roller is made of different materials, has different adhesion capabilities to the cathode layer solution, and has different pressures to the electrode foils during coating, which may cause different coating effects of the roller made of different materials on the cathode layer solution with the same viscosity. Such as sponges, wool, silica gel, etc., have different adhesion capabilities to cathode layer solutions of the same viscosity. Therefore, the roller made of the proper roller material can be selected according to the viscosity of the cathode layer solution for roller coating, so that the roller coating efficiency is improved, the consumption of the cathode layer solution during roller coating is reduced, and the cost is reduced.
For example, if the viscosity of the cathode layer solution is lower than a predetermined viscosity threshold, the cathode layer solution may be roll-coated using a sponge roller, and if the viscosity of the cathode layer solution is higher, the cathode layer solution may be roll-coated using a wool roller. For another example, when the silver paste layer is coated, the viscosity of the silver paste is high, and the cost is high, the silver paste layer can be a silica gel roller, and the consumption of the silver paste is reduced while the silver paste layer is uniformly coated, so that the manufacturing cost is reduced. It should be noted that the above is only an example, and should not be a limitation of the present application, and in the actual production process, there may be rollers made of other materials, which may be selected reasonably according to the requirements.
In one embodiment, the electrode foil may be subjected to multiple formation treatments before the cathode layer is formed, so as to further repair the surface defects of the electrode foil.
In the embodiment of the present application, after the cathode layer is coated on the surface of the electrode foil, the capacitor core can be obtained. The cathode layer is generated on the surface of the negative electrode area of the electrode foil by using a spraying process and/or a rolling coating process, and the cathode layer can be applied to manufacturing of a large-size capacitor.
In addition, since the dipping process uses a dipping tank, the dipping tank may limit the shape and size of the electrode foil, so that the electrode foil with the same area size and the electrode foil with the irregular shape may have the problems of difficulty in generating the cathode layer and high manufacturing cost compared with the electrode foil with the conventional shape. The spraying process or the rolling coating process can effectively reduce the difficulty of generating the cathode layer by the electrode foil with an unconventional size or shape, thereby reducing the manufacturing cost of the capacitor core.
Based on the same inventive concept, the embodiment of the present application also provides a capacitor, which comprises a stacked body and a lead.
A stacked body including a plurality of capacitor cores.
In this embodiment, the capacitor core may be the capacitor core in the above embodiment or the capacitor core manufactured by the above capacitor core manufacturing method.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a stacked body provided in an embodiment of the present application.
In this embodiment, the stacked body is formed by stacking a plurality of capacitor cores, and the same-polarity regions between different capacitor cores overlap. As shown in fig. 4, the positive electrode region overlaps the positive electrode region, and the negative electrode region overlaps the negative electrode region between different capacitor elements.
And a plurality of leads each connected to a region of different polarity in the stacked body.
Wherein the leads are made of a conductive material and respectively connect the positive electrode region and the negative electrode region in the stacked body.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a capacitor according to an embodiment of the present disclosure.
In one embodiment, a negative electrode lead foil may be connected to a surface of the negative electrode region of the stack, and the negative electrode lead foil is connected to a negative electrode lead, wherein the negative electrode lead foil is used to lead out the negative electrode region.
In this embodiment, the negative electrode lead-out foil has a sheet structure having a certain area, and the area of the negative electrode lead-out foil is smaller than the area of the negative electrode region of the stacked body, wherein the negative electrode lead-out foil is made of a conductive material, such as copper, silver, nickel-tin alloy, or the like. Through the sheet structure, the contact area between the negative electrode lead-out foil and the negative electrode area can be increased, so that the equivalent series resistance between the negative electrode lead and the negative electrode area is reduced, and the conductivity between the negative electrode lead and the negative electrode area is increased.
In one embodiment, the capacitor may further include a rigid insulating plate fixed to the front and back surfaces of the negative electrode region of the capacitor.
In this embodiment, the electrode foil of the capacitor may have a relatively large size, and may be bent under the action of an external stress, and the hard insulating plate is used to protect the capacitor, thereby improving the capability of the capacitor against the influence of an external force.
In one embodiment, the capacitor further comprises an insulating and moisture-proof packaging material, and the packaging material covers the other areas of the capacitor except the electrode leads.
In the embodiment, the capacitor is packaged by using the insulating and moisture-proof packaging material, so that the insulativity and the moisture resistance of the capacitor can be effectively improved, and the application range of the capacitor is widened.
In this embodiment, the packaging material may be an insulating and moisture-proof soft film material such as an aluminum plastic film. In some embodiments, the packaging material may also be a hard material such as ceramic that is insulating and moisture resistant.
Next, the specific contents of the manufacturing method of the capacitor will be explained.
Referring to fig. 6, fig. 6 illustrates a method for manufacturing a capacitor according to an embodiment of the present disclosure, including:
s210, obtaining a plurality of capacitor cores.
In this embodiment, the capacitor core may be the capacitor core in the above embodiment or the capacitor core manufactured by the above capacitor core manufacturing method.
And S220, stacking the capacitors to obtain a stacked body.
In this embodiment, the same polarity regions between different capacitor cores may be overlapped.
In this embodiment, the number of capacitor cores in the stacked body may be set reasonably according to the requirement for the electrical performance of the capacitor, and the relation between the electrical performance of the capacitor and the number of capacitor cores may refer to the prior art, which is not described herein again.
In this embodiment, when stacking, can use bonding silver thick liquid and exert certain temperature and pressure and form electrical connection.
And S230, connecting the stacked body with regions of different polarities by using different electrode leads respectively to obtain the capacitor.
In this example, the positive electrode region and the negative electrode region of the stacked body were connected using different electrode leads, respectively, to obtain a capacitor. Wherein, the electrode lead is made of conductive material.
In one embodiment, the negative electrode lead foil is used to connect to the negative electrode region of the stack before connecting to the regions of different polarity of the stack using different electrode leads, respectively; the negative electrode leading-out foil is of a sheet structure and is made of a conductive material.
The negative electrode lead-out foil can be connected with the negative electrode area of the electrode foil on the surface of the stacked body by using conductive adhesive.
In one embodiment, the negative lead foil may be a copper foil. It can be understood that the negative electrode lead-out foil can be reasonably selected according to the conductivity and the cost, and the copper has better conductivity and lower cost and is suitable for industrial manufacture. In other embodiments, the negative electrode lead foil may also be a silver foil or the like.
In one embodiment, the capacitor is fixed using a hard insulating plate after being connected to regions of different polarities of the stacked body using different electrode leads, respectively.
In one embodiment, after the different electrode leads are respectively connected to the regions of different polarities of the stacked body, the capacitor is encapsulated using an insulating and moisture-proof encapsulating material.
The examples of this application also provide a complete implementation of one possible implementation to facilitate understanding of the concepts of this application by those skilled in the art. It is to be understood that the following implementation is only exemplary and should not be construed as limiting the present application.
In an alternative embodiment, the process implemented may include:
first, an electrode foil is obtained, and the electrode foil may be a foil obtained by cutting a previously pressed aluminum foil in a predetermined shape. When the aluminum foil is cut, a corresponding cutting process can be selected according to the target shape. For example, when the shape is a semicircular ring, laser cutting may be used, and when the shape is the shape shown in fig. 1, mechanical cutting or die cutting may be used.
Next, the electrode foil is pretreated. The method comprises the following steps: the aluminum foil is welded on the stainless steel bar, so that the mass production is facilitated; carrying out formation treatment on the electrode foil welded on the steel bar by immersing the electrode foil into the formation liquid; and taking the electrode foil out, putting the electrode foil into an oven for heat treatment, and putting the heat-treated electrode foil into the formation liquid again for formation.
Then, an isolation layer and a protective layer are sequentially coated on the electrode foil. The coating position of the isolating layer is the joint of a preset positive electrode area and a preset negative electrode area, and the protective layer is coated on the edge of the negative electrode area.
Next, a cathode layer is formed on the negative electrode surface of the electrode foil using a spray coating process and/or a roll coating process. For example, an electrolyte solution and a graphite solution are sprayed in sequence using a nozzle to produce an electrolyte layer and a graphite layer, and a silver paste solution is roll-coated using a silica roller to produce a silver paste layer.
Thus, the capacitor core can be obtained. Next, a capacitor can be manufactured using the capacitor core, and the implementation process may include:
according to the setting of the capacitor capacity value, a plurality of capacitor cores are stacked to obtain a stacked body, and during stacking, different capacitor cores can be electrically connected through bonding silver paste.
The negative electrode lead foil may be, but is not limited to, a copper foil, and is connected to the electrode foil on the surface of the stacked body by using a conductive paste.
And welding the electrode leads of the anode and the cathode with the anode area and the cathode lead-out foil respectively to obtain the capacitor.
The capacitor may then be packaged, and the packaging process may include:
attaching the capacitor to the front and back surfaces of the stacked body by using a hard insulating plate, and fixing; the stacked body was sealed with an aluminum plastic film to obtain a packaged capacitor.
Finally, the packaged capacitor can also be aged and tested for performance.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims (13)

1. A method of manufacturing a capacitor core, comprising:
obtaining an electrode foil, wherein the electrode foil comprises a positive electrode area and a negative electrode area which are mutually isolated;
generating a cathode layer on the surface of the negative electrode area by using a spraying process and/or a roll coating process to obtain the capacitor core; wherein the cathode layer comprises one or more of an electrolyte layer, a graphite layer and a silver paste layer.
2. The method of claim 1, wherein prior to the cathode layer being formed on the surface of the anode region using a spray coating process and/or a roll coating process, the method further comprises:
generating the cathode layer on the surface of the negative electrode area by using a coating process corresponding to the viscosity of the cathode layer solution based on a first preset relation between the viscosity of the cathode layer solution and the coating process and the viscosity of the cathode layer solution; wherein the coating process comprises a spray coating process and the roll coating process.
3. The method of claim 2, wherein the forming the cathode layer on the surface of the negative electrode region using a coating process corresponding to a viscosity of the cathode layer solution comprises:
when the viscosity of the cathode layer solution is determined to be larger than a preset viscosity threshold value, generating the cathode layer on the surface of the negative electrode area by using the roll coating process;
and/or the presence of a gas in the atmosphere,
and when the viscosity of the cathode layer solution is determined to be less than or equal to the preset viscosity threshold, generating the cathode layer on the surface of the negative electrode area by using the spraying process.
4. The method of claim 3, wherein the roll coating process is a process of coating the negative electrode area surface using a roller to generate the cathode layer;
before the cathode layer is generated on the surface of the negative electrode area by using a roll coating process, the method further comprises the following steps:
and determining the roller material corresponding to the viscosity of the cathode layer solution based on the viscosity of the cathode layer solution and a second preset relation between the viscosity of the cathode layer solution and the roller material, so as to coat the surface of the negative electrode area by using the roller with the roller material to generate the cathode layer.
5. The method of claim 1, wherein the obtaining an electrode foil comprises:
and cutting the substrate of the electrode foil by using a cutting process corresponding to the target shape based on a third preset relation between the shape of the electrode foil and the cutting process of the electrode foil and the target shape of the electrode foil to obtain the electrode foil with the target shape.
6. The method of claim 1, wherein the area of the electrode foil is greater than a preset area threshold.
7. The method according to any of claims 1-6, wherein after said obtaining the electrode foil, the method further comprises:
and coating a protective layer on the weak part of the negative electrode area, wherein the protective layer is made of an insulating material.
8. A capacitor core, comprising:
an electrode foil including a positive electrode region and a negative electrode region isolated from each other;
the electrode foil surface has a cathode layer produced by a roll coating process and/or a spray coating process.
9. A method of manufacturing a capacitor, comprising:
obtaining a plurality of capacitor elements manufactured based on the capacitor element manufacturing method according to any one of claims 1 to 7;
stacking a plurality of the capacitor cores to obtain a stacked body; in the stacked body, regions of the same polarity between different ones of the capacitor cores overlap;
the capacitor is obtained by connecting different electrode leads to regions of different polarities of the stacked body, respectively.
10. The method of claim 9, wherein prior to said connecting with regions of different polarity of the stack using different electrode leads, respectively, the method comprises:
connecting with a negative electrode region of the stacked body using a negative electrode lead foil; the negative electrode lead-out foil is of a sheet structure and is made of a conductive material.
11. The method of claim 9, wherein after the connecting with the regions of different polarity of the stack using different electrode leads, respectively, the method further comprises:
the capacitor is fixed using a rigid insulating plate.
12. The method of claim 9, wherein after said respectively connecting with regions of different polarity of said stack using different electrode leads, said method further comprises:
the capacitor is encapsulated with an insulating moisture-proof encapsulating material.
13. A capacitor, comprising:
a stacked body including a plurality of capacitor cores manufactured based on the method according to any one of claims 1 to 7, and regions of the same polarity between different ones of the capacitor cores overlap;
and a plurality of leads respectively connected to regions of different polarities in the stacked body.
CN202211356457.7A 2022-11-01 2022-11-01 Capacitor core, capacitor and manufacturing method Pending CN115512966A (en)

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