Packaging method of ceramic capacitor and ceramic capacitor

Abstract

The invention provides a packaging method of a ceramic capacitor and the ceramic capacitor, and belongs to the technical field of ceramic capacitors, and the packaging method comprises the steps: 1, according to the packaging demand information of the ceramic capacitor, a packaging strategy is decided; 2, determining a monitoring item of a packaging process based on a packaging strategy; and step 3, based on the monitoring items, carrying out packaging normativity inspection. According to the packaging method of the ceramic capacitor and the ceramic capacitor, the expert model is introduced, and the packaging strategy is decided according to the packaging demand information of the ceramic capacitor; and then the monitoring item of the packaging process is determined according to the packaging strategy, and the packaging normativity test is performed based on the monitoring item, so that the normativity and suitability of the ceramic capacitor packaging process are improved.

Description

Technical Field

[0001] This invention relates to the field of ceramic capacitor technology, and in particular to a ceramic capacitor packaging method and a ceramic capacitor. Background Technology

[0002] The packaging method for ceramic capacitors is crucial, its core purpose being to ensure stable and reliable operation in complex application scenarios through physical protection, performance optimization, and environmental adaptation. Currently, ceramic capacitor packaging methods are mainly divided into three categories: surface mount technology (SMT), through-hole packaging, and special packaging, selected based on different application scenarios, performance requirements, and process conditions. Conventional packaging strategy determination requires manual decision-making based on packaging requirements, and the quality of this decision largely depends on the experience of the decision-maker, and cannot be made immediately or adaptively.

[0003] In view of this, there is an urgent need for a packaging method for ceramic capacitors and a ceramic capacitor in order to at least solve the above-mentioned shortcomings. Summary of the Invention

[0004] One of the objectives of this invention is to provide a ceramic capacitor packaging method and a ceramic capacitor. By introducing an expert model and making a packaging strategy decision based on the packaging requirements of the ceramic capacitor, the method further determines the monitoring items for the packaging process based on the packaging strategy, and conducts packaging compliance inspection based on the monitoring items, thereby improving the standardization and suitability of the ceramic capacitor packaging process.

[0005] An embodiment of the present invention provides a method for packaging a ceramic capacitor, comprising: Step 1: Determine the packaging strategy based on the packaging requirements of ceramic capacitors; Step 2: Based on the packaging strategy, determine the monitoring items for the packaging process; Step 3: Based on the monitoring items, conduct packaging standardization verification.

[0006] Preferably, the packaging requirements information includes: The electrical performance requirements, mechanical strength and size requirements, as well as environmental and reliability requirements for ceramic capacitors.

[0007] Preferably, electrical performance requirements include: capacitance value, capacitance tolerance, rated voltage, and frequency characteristics.

[0008] Preferably, mechanical strength and size requirements include: package type, thickness, height, and terminal structure.

[0009] Preferred environmental and reliability requirements include: temperature range and humidity protection.

[0010] Preferably, step 2: based on the packaging strategy, determining the monitoring items of the packaging process, including: determining the standard process corresponding to the packaging strategy; taking the normative inspection items of the standard process as the monitoring items.

[0011] Preferably, step 1: according to the packaging requirement information of the ceramic capacitor, determining the packaging strategy, including: when the ceramic capacitor needs epoxy resin insulation protection, determining the process parameters of the epoxy resin pouring, including: constructing a target three-dimensional model according to the pouring structure parameters of the ceramic capacitor needing epoxy resin insulation protection; simulating pouring based on different pouring parameters in the target three-dimensional model to obtain a target finished product model; extracting quality evaluation features of the target finished product model; evaluating the optimal pouring parameters according to the quality evaluation features, and taking the optimal pouring parameters as the process parameters.

[0012] The packaging method for the ceramic capacitor provided in the embodiment of the application further includes: if the first bubble residual rate in the target finished product model corresponding to the optimal pouring parameters is greater than or equal to a preset bubble residual rate threshold, simulating layered pouring with the optimal pouring parameters unchanged to determine a layered pouring strategy; taking the layered pouring strategy and the optimal pouring parameters as the process parameters.

[0013] Preferably, simulating layered pouring with the optimal pouring parameters unchanged to determine the layered pouring strategy includes: obtaining a pouring layer thickness-bubble distribution feature table of the optimal pouring parameters according to historical pouring experiments of the optimal pouring parameters; determining a preselected layered pouring strategy of the target finished product model; determining the bubble distribution features of each layer in the preselected layered pouring strategy according to the pouring layer thickness-bubble distribution feature table; simulating defoaming according to the bubble distribution features of each layer and the performance parameters of a vacuum defoaming machine to determine a second bubble residual rate after layered pouring based on the preselected layered pouring strategy; taking the layered level as the horizontal axis and the second bubble residual rate as the vertical axis, drawing a visual curve corresponding to the preselected layered pouring strategy; drawing a straight line with the vertical axis value equal to the bubble residual rate threshold and parallel to the horizontal axis to determine a visual curve point corresponding to the minimum layered level below the straight line, and taking the preselected layered pouring strategy corresponding to the visual curve point as the layered pouring strategy.

[0014] The embodiment of the application provides a ceramic capacitor, which is packaged by using the packaging method for the ceramic capacitor.

[0015] The embodiment of the present application provides a packaging system of a ceramic capacitor, comprising: A strategy decision module is configured to decide a packaging strategy according to packaging requirement information of the ceramic capacitor; A monitoring item determination module is configured to determine monitoring items of a packaging process based on the packaging strategy; An inspection module is configured to perform a packaging standard inspection based on the monitoring items; The strategy decision module decides the packaging strategy according to the packaging requirement information of the ceramic capacitor, and performs the following operations: When the ceramic capacitor needs epoxy resin insulation protection, process parameters of epoxy resin pouring are decided, including: A target three-dimensional model is constructed according to pouring structure parameters of the ceramic capacitor needing epoxy resin insulation protection; A target finished product model is obtained by simulating pouring based on different pouring parameters in the target three-dimensional model; Quality evaluation features of the target finished product model are extracted; Optimal pouring parameters are evaluated according to the quality evaluation features, and the optimal pouring parameters are taken as the process parameters; If a first bubble residual rate in the target finished product model corresponding to the optimal pouring parameters is greater than or equal to a preset bubble residual rate threshold, stratified pouring is simulated by keeping the optimal pouring parameters unchanged, and a stratified pouring strategy is determined; The stratified pouring strategy and the optimal pouring parameters are taken as the process parameters; The stratified pouring strategy is determined by simulating stratified pouring by keeping the optimal pouring parameters unchanged, including: A pouring layer thickness-bubble distribution feature table of the optimal pouring parameters is obtained according to historical pouring experiments of the optimal pouring parameters; A preselected stratified pouring strategy of the target finished product model is determined; Bubble distribution features of each stratification in the preselected stratified pouring strategy are determined according to the pouring layer thickness-bubble distribution feature table; A second bubble residual rate after stratified pouring based on the preselected stratified pouring strategy is determined according to bubble distribution features of each stratification and performance parameters of a vacuum defoaming machine; A visual curve corresponding to the preselected stratified pouring strategy is drawn with stratification levels as a horizontal axis and the second bubble residual rate as a vertical axis; A straight line with a vertical axis value equal to the bubble residual rate threshold and parallel to the horizontal axis is drawn, a visual curve point corresponding to the preselected stratified pouring strategy with the smallest stratification level under the straight line is determined, and the preselected stratified pouring strategy corresponding to the visual curve point is taken as the stratified pouring strategy.

[0016] The present application has the following advantages: The application introduces an expert model, decides a packaging strategy according to packaging requirement information of the ceramic capacitor, determines a monitoring item of a packaging process according to the packaging strategy, and performs packaging standardization inspection based on the monitoring item, thereby improving standardization and suitability of the ceramic capacitor packaging process.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof.

[0018] The technical solutions of the present application are described in further detail below with the aid of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the principles of the present application, and are not intended to limit the present application. In the drawings: Figure 1 It is a schematic diagram of a packaging method of a ceramic capacitor in an embodiment of the present application; Figure 2 It is a schematic diagram of a packaging system of a ceramic capacitor in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application are described below with the aid of the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and do not limit the present application.

[0021] The embodiment of the present application provides a packaging method of a ceramic capacitor, as shown in the figure, comprising: Figure 1 Step 1: deciding a packaging strategy according to packaging requirement information of the ceramic capacitor; The packaging requirement information includes electrical performance requirement, mechanical strength and size requirement, and environmental and reliability requirement of the ceramic capacitor. The electrical performance requirement includes capacitance, capacitance error, rated voltage and frequency characteristic. The mechanical strength and size requirement includes packaging type, thickness, height and terminal structure. The environmental and reliability requirement includes temperature range and humidity protection. When the packaging strategy is decided according to the packaging requirement information of the ceramic capacitor, the packaging requirement information is input into an AI model (expert model) trained based on a plurality of process records of packaging decisions made by experts according to packaging requirements, and the packaging strategy output by the AI model is obtained. Step 2: determining a monitoring item of a packaging process based on the packaging strategy; ​The monitoring item is determined by first determining the standard process corresponding to the packaging strategy, and then taking the standard inspection item of the standard process as the monitoring item; for example, the epoxy resin layer-by-layer encapsulation of the automotive-grade MLCC is determined as a packaging strategy, and the standard process thereof includes: 1, capacitor pretreatment; 2, resin mixing; 3, vacuum degassing; 4, layer-by-layer encapsulation; 5, step curing; and the standard inspection item of the standard process is: a project that restricts the standard process to comply with the standard of the process, such as: the standard process is capacitor pretreatment, the standard process complies with the standard of the process, which is: using a 50W plasma cleaning machine to clean Ar gas for 3min, and the corresponding standard inspection item is: monitoring whether 50W plasma cleaning machine is used to clean Ar gas for 3min, and for example: the standard process is vacuum degassing, and the standard process complies with the standard of the process, which is: using a 5mbar vacuum degassing machine to degas for 10min, and the corresponding standard inspection item is: monitoring whether 5mbar vacuum degassing machine is used to degas for 10min; Step 3: Based on the monitoring item, the packaging standard inspection is performed.

[0022] The working principle and beneficial effects of the above technical solutions are: The expert model is introduced, the packaging strategy is determined according to the packaging requirement information of the ceramic capacitor, the monitoring item of the packaging process is determined according to the packaging strategy, the packaging standard inspection is performed based on the monitoring item, and the standardization and suitability of the ceramic capacitor packaging process are improved.

[0023] In one embodiment, step 1: determining the packaging strategy according to the packaging requirement information of the ceramic capacitor, comprising: When the ceramic capacitor needs epoxy resin insulation protection, the process parameters of epoxy resin encapsulation are determined; When the ceramic capacitor needs epoxy resin insulation protection, the process parameters of epoxy resin encapsulation are determined, comprising: According to the encapsulation structure parameters of the ceramic capacitor which needs epoxy resin insulation protection, a target three-dimensional model is constructed; Wherein, whether the ceramic capacitor needs epoxy resin insulation protection is determined by analyzing the packaging strategy; Wherein, the encapsulation structure parameters are three-dimensional data of the ceramic capacitor encapsulation layer, such as resin flow channel and mold cavity boundary; the target three-dimensional model is a digital simulation model reconstructed based on the encapsulation structure parameters; In the target three-dimensional model, different glue injection parameters are simulated based on different glue injection parameters to obtain a target finished product model; The glue injection parameters include: glue solution type, glue solution viscosity, glue injection pressure, glue injection speed, glue injection temperature and glue injection path; the target finished product model is: a virtual sample containing a resin solidification form after simulation of glue injection, and the resin flow-solidification coupling process is simulated by CFD software (such as ANSYS Fluent) to obtain; extract quality evaluation features of the target finished product model; The quality evaluation features are indexes for quantitatively evaluating the packaging effect, such as: resin coverage, bubble volume proportion and residual stress, etc. According to the quality evaluation features, the optimal glue injection parameters are evaluated, and the optimal glue injection parameters are used as process parameters.

[0024] The working principle and beneficial effects of the above technical solutions are: The present application constructs a target three-dimensional model based on the encapsulation structure parameters of the ceramic capacitor which needs epoxy resin insulation protection, simulates glue injection based on different glue injection parameters in the target three-dimensional model, determines the optimal glue injection parameters with the best quality evaluation in the simulated target finished product model for subsequent process application, avoids the capacitance drift and loss increase of the ceramic capacitor, and reduces the mechanical reliability risk.

[0025] In one embodiment, when the ceramic capacitor needs epoxy resin insulation protection, the process parameters of epoxy resin encapsulation are determined, and the process parameters further include: If the first bubble residual rate in the target finished product model corresponding to the optimal glue injection parameters is greater than or equal to the preset bubble residual rate threshold, the simulation optimal glue injection parameters are unchanged for layered glue injection, and a layered glue injection strategy is determined; The preset bubble residual rate threshold is set by artificial pre-setting; The layered glue injection strategy and the optimal glue injection parameters are used as process parameters; The simulation optimal glue injection parameters are unchanged for layered glue injection, and the layered glue injection strategy is determined, including: According to the historical glue injection experiment of the optimal glue injection parameters, a glue injection layer thickness-bubble distribution feature table of the optimal glue injection parameters is obtained; The historical glue injection experiment is an experiment based on the optimal glue injection parameters in history; The glue injection layer thickness-bubble distribution feature table is established according to historical glue injection experiment data, and records the mapping relationship between different glue injection layer thicknesses and corresponding bubble distribution rules; A preselected layered glue injection strategy of the target finished product model is determined; The preselected layered glue injection strategy is a plurality of layered glue injection strategies given by the staff according to the on-site situation in the case that the single-layer glue injection scheme fails to meet the bubble rate, and the layered glue injection strategy includes: performing several layers of glue injection, and how thick each layer of glue injection is; According to the glue injection layer thickness-bubble distribution characteristic table, the bubble distribution characteristic of each layer in the preselected layered glue injection strategy is determined; The bubble distribution characteristic includes the bubble distribution position in each layer. According to the bubble distribution characteristic of each layer and the performance parameters of the vacuum debubbling machine, the second bubble residual rate after layered glue injection based on the preselected layered glue injection strategy is determined by simulating bubble elimination. The performance parameters of the vacuum debubbling machine include the lowest absolute pressure that the vacuum debubbling machine can reach and the longest duration of one operation. A visual curve corresponding to the preselected layered glue injection strategy is drawn with the layered level as the horizontal axis and the second bubble residual rate as the vertical axis. The visual curve corresponding to the preselected layered glue injection strategy is marked with coordinate points in the Cartesian coordinate system with the layered level as the horizontal axis and the second bubble residual rate as the vertical axis, and the coordinate points are connected in sequence to obtain the visual curve. The coordinate points corresponding to the preselected layered glue injection strategy have the same horizontal axis coordinate as the layered level corresponding to the preselected layered glue injection strategy, and the same vertical axis coordinate as the second bubble residual rate that the preselected layered glue injection strategy ideally achieves. A straight line with a vertical axis value equal to the bubble residual rate threshold and parallel to the horizontal axis is drawn to determine the minimum visual curve point corresponding to the layered level below the straight line. The preselected layered glue injection strategy corresponding to the visual curve point is determined as the layered glue injection strategy.

[0026] The working principle and beneficial effects of the above technical solution are as follows: When ceramic capacitors are filled with epoxy resin, layered glue injection can effectively solve the problem of high bubble rate in single-layer glue injection. However, frequent layering greatly reduces the efficiency of the filling process. Moreover, the bubble elimination effect of layered glue injection is not simply positively correlated with the number of layers, but there is an optimal number of layers. Exceeding this number may actually degrade performance. Therefore, when different preselected layered glue injection strategies are proposed, they need to be screened.

[0027] Specifically, the bubble distribution characteristic of each layer is determined according to the glue injection layer thickness-bubble distribution characteristic table. Considering the performance limitations of the vacuum debubbling machine, the second bubble residual rate after layered glue injection based on the preselected layered glue injection strategy is determined by simulating bubble elimination according to the bubble distribution characteristic of each layer and the performance parameters of the vacuum debubbling machine, thereby improving the calculation accuracy of the second bubble residual rate.

[0028] With the layering level as the horizontal axis and the second bubble residue rate as the vertical axis, a visualization curve corresponding to the pre-selected layered dispensing strategy is plotted. A straight line is plotted with the vertical axis value equal to the bubble residue rate threshold and parallel to the horizontal axis. The visualization curve point below the line corresponding to the minimum layering level is determined, and the pre-selected layered dispensing strategy corresponding to the visualization curve point is taken as the layered dispensing strategy. Considering that the defoaming effect of layered dispensing is not simply positively correlated with the number of layers, but rather there is an optimal number of layers, exceeding which may degrade performance, and also considering improving the efficiency of the potting process, a straight line corresponding to the bubble residue rate threshold is introduced. The visualization curve point below the line corresponding to the minimum layering level is determined, allowing for a more intuitive selection of the target curve point and greatly improving the screening efficiency of layered dispensing strategies.

[0029] This invention provides a ceramic capacitor, which is packaged using the ceramic capacitor packaging method described above.

[0030] This invention provides a packaging system for ceramic capacitors, such as... Figure 2 As shown, it includes: Strategy decision module 1 is used to decide on the packaging strategy based on the packaging requirements information of ceramic capacitors; Monitoring Item Determination Module 2 is used to determine the monitoring items for the packaging process based on the packaging strategy; Inspection module 3 is used to perform packaging compliance inspection based on monitoring items; The strategy decision module 1 determines the packaging strategy based on the packaging requirements of the ceramic capacitor and performs the following operations: When ceramic capacitors require epoxy resin insulation protection, the process parameters for epoxy resin potting are determined as follows: Based on the required encapsulation structure parameters of the epoxy resin-insulated ceramic capacitor, a target three-dimensional model is constructed. Simulate glue injection based on different glue injection parameters in the target 3D model to obtain the target finished product model; Extract quality assessment features from the target finished product model; The optimal dispensing parameters are evaluated based on the quality assessment characteristics, and the optimal dispensing parameters are used as process parameters. If the first bubble residual rate in the target finished product model corresponding to the optimal glue injection parameters is greater than or equal to the preset bubble residual rate threshold, the optimal glue injection parameters are kept unchanged and layered glue injection is performed to determine the layered glue injection strategy. The layered dispensing strategy and optimal dispensing parameters are used as process parameters; Among them, the optimal dispensing parameters are kept constant during the simulation to determine the layered dispensing strategy, including: Based on historical injection experiments with optimal injection parameters, a characteristic table of injection layer thickness and bubble distribution with optimal injection parameters was obtained. Determine a preselected layering injection strategy of the target product model; According to the injection layer thickness-bubble distribution characteristics table, determine the bubble distribution characteristics of each layer in the preselected layering injection strategy; According to the bubble distribution characteristics of each layer and the performance parameters of the vacuum defoaming machine, simulate defoaming to determine the second bubble residual rate after layering injection based on the preselected layering injection strategy; With the layering level as the horizontal axis and the second bubble residual rate as the vertical axis, draw the visual curve corresponding to the preselected layering injection strategy; Draw a straight line with the vertical axis value equal to the bubble residual rate threshold and parallel to the horizontal axis, determine the visual curve point corresponding to the minimum layering level below the straight line, and take the preselected layering injection strategy corresponding to the visual curve point as the layering injection strategy.

[0031] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A method for packaging a ceramic capacitor, characterized in that, include: Step 1: Determine the packaging strategy based on the packaging requirements of ceramic capacitors; Step 2: Based on the packaging strategy, determine the monitoring items for the packaging process; Step 3: Based on the monitoring items, conduct packaging standardization verification.

2. The packaging method for a ceramic capacitor as described in claim 1, characterized in that, Packaging requirements include: The electrical performance requirements, mechanical strength and size requirements, as well as environmental and reliability requirements for ceramic capacitors.

3. The packaging method for a ceramic capacitor as described in claim 2, characterized in that, Electrical performance requirements include: capacitance value, capacitance tolerance, rated voltage, and frequency characteristics.

4. The packaging method for a ceramic capacitor as described in claim 2, characterized in that, Mechanical strength and dimensional requirements include: package type, thickness, height, and terminal structure.

5. The packaging method for a ceramic capacitor as described in claim 2, characterized in that, Environmental and reliability requirements include temperature range and humidity protection.

6. The packaging method for a ceramic capacitor as described in claim 1, characterized in that, Step 2: Based on the packaging strategy, determine the monitoring items for the packaging process, including: Determine the standard manufacturing process corresponding to the packaging strategy; The standard process compliance inspection items are used as monitoring items.

7. The packaging method for a ceramic capacitor as described in claim 1, characterized in that, Step 1: Based on the packaging requirements of ceramic capacitors, determine the packaging strategy, including: When ceramic capacitors require epoxy resin insulation protection, the process parameters for epoxy resin potting are determined as follows: Based on the required encapsulation structure parameters of the epoxy resin-insulated ceramic capacitor, a target three-dimensional model is constructed. Simulate glue injection based on different glue injection parameters in the target 3D model to obtain the target finished product model; Extract quality assessment features from the target finished product model; The optimal dispensing parameters are evaluated based on the quality assessment characteristics, and these optimal dispensing parameters are used as the process parameters.

8. The packaging method for a ceramic capacitor as described in claim 7, characterized in that, Also includes: If the first bubble residual rate in the target finished product model corresponding to the optimal glue injection parameters is greater than or equal to the preset bubble residual rate threshold, the optimal glue injection parameters are kept unchanged and layered glue injection is performed to determine the layered glue injection strategy. The layered dispensing strategy and optimal dispensing parameters are used as process parameters.

9. The packaging method for a ceramic capacitor as described in claim 8, characterized in that, Simulate layered glue injection with optimal injection parameters unchanged to determine the layered glue injection strategy, including: Based on historical injection experiments with optimal injection parameters, a characteristic table of injection layer thickness and bubble distribution with optimal injection parameters was obtained. Determine the pre-selected layered glue injection strategy for the target finished product model; Based on the glue layer thickness-bubble distribution characteristic table, determine the bubble distribution characteristics of each layer in the pre-selected layered glue injection strategy; Based on the bubble distribution characteristics of each layer and the performance parameters of the vacuum defoamer, the defoaming process was simulated to determine the second bubble residual rate after layered dispensing based on the pre-selected layered dispensing strategy. Plot a visualization curve corresponding to the pre-selected layered dispensing strategy with the layer level as the horizontal axis and the second bubble residual rate as the vertical axis. Plot a straight line with the vertical axis value equal to the bubble residual rate threshold and parallel to the horizontal axis. Determine the visual curve point below the line corresponding to the smallest layer level, and use the pre-selected layer dispensing strategy corresponding to the visual curve point as the layer dispensing strategy.

10. A ceramic capacitor, characterized in that, The ceramic capacitor is packaged using the packaging method described in claims 1-9.

Images