A ceramic welding seat suitable for ultrasonic welding and a preparation method thereof

Abstract

The application relates to a ceramic welding seat suitable for ultrasonic welding and a preparation method thereof, and relates to the technical field of ultrasonic welding in the lithium battery manufacturing industry. The ceramic welding seat comprises the following raw materials in parts by weight: 70-80 parts of alumina powder, 20-30 parts of tungsten powder, 5-8 parts of molybdenum powder and 15-20 parts of chromium powder. The ceramic welding seat provided by the application adopts alumina powder, tungsten powder, molybdenum powder and chromium powder in a specific proportion as material raw materials, the ceramic welding seat is made of special materials, and is controlled through a suitable formula proportion, so that a ceramic welding seat suitable for ultrasonic welding is obtained, good thermal conductivity, mechanical properties and stability are realized. In the application of the lithium battery manufacturing industry, the ceramic welding seat is used for ultrasonic welding, can withstand the action of high-frequency ultrasonic vibration, is not prone to sticking in the welding process, and can maintain stability for a long time, and the service life of the ceramic welding seat is improved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic welding technology in the lithium battery manufacturing industry, and in particular to a ceramic welding base suitable for ultrasonic welding and its preparation method. Background Technology

[0002] Ultrasonic welding is a common welding method used in lithium battery manufacturing. It utilizes ultrasonic energy generated by high-frequency vibration to cause localized vibration at the welding area, which melts and forms a connection under the action of friction. Ultrasonic welding has advantages such as fast welding speed, good weld quality, and environmental friendliness. It is suitable for manufacturing battery components of various sizes, such as welding between lithium battery tabs and between tabs and electrolyte conductors.

[0003] However, in the traditional welding process, the welding socket and the workpiece are prone to sticking, which leads to a decline in welding quality. In addition, the welding socket has a short service life and needs to be replaced frequently, which increases production costs and workload. Summary of the Invention

[0004] To address the above problems, this invention provides a ceramic welding base suitable for ultrasonic welding and a method for preparing the same.

[0005] In a first aspect, the present invention provides a ceramic welding base suitable for ultrasonic welding, wherein the ceramic welding base comprises the following raw materials in parts by weight:

[0006] 70-80 parts of alumina powder, 20-30 parts of tungsten powder, 5-8 parts of molybdenum powder, and 15-20 parts of chromium powder.

[0007] Furthermore, the ceramic bonding pad comprises the following materials in parts by weight:

[0008] 75 parts alumina powder, 25 parts tungsten powder, 6.25 parts molybdenum powder and 18.75 parts chromium powder.

[0009] Furthermore, the alumina powder has a particle size of 6000-8000 mesh, the tungsten powder has a particle size of 6000-8000 mesh, the molybdenum powder has a particle size of 6000-8000 mesh, and the chromium powder has a particle size of 6000-8000 mesh.

[0010] In a second aspect, the present invention provides a method for preparing a ceramic welding base suitable for ultrasonic welding as described in any one of the first aspects, the method comprising the following steps:

[0011] Alumina powder, tungsten powder, molybdenum powder and chromium powder are mixed to obtain a mixed powder.

[0012] The mixed powder is placed in a welding base mold and pressed, and then sintered to obtain a crude ceramic welding base.

[0013] The rough ceramic welding base is then precision machined to obtain a ceramic welding base suitable for ultrasonic welding.

[0014] Furthermore, the operating parameters for the pressing include a pressure of 185-220 MPa.

[0015] Furthermore, the sintering operating parameters include: a temperature of 1680-1700℃ and a time of 2-3 hours.

[0016] Further, the step of refining the rough ceramic welding base to obtain a ceramic welding base suitable for ultrasonic welding includes the following processes:

[0017] The rough ceramic welding base is precisely dimensionally machined and the upper surface tooth profile is machined using a CNC grinding machine to obtain a ceramic welding base suitable for ultrasonic welding. The tooth profile is a pyramid-shaped matrix with a length of 1mm, a width of 1mm, and a height of 0.43mm, and a left and right spacing of 0.2mm. The surface is controlled at Ra0.8.

[0018] The technical solutions provided in the embodiments of the present invention have at least the following advantages compared with the prior art:

[0019] This invention provides a ceramic welding base suitable for ultrasonic welding. The ceramic welding base uses a specific ratio of alumina powder, tungsten powder, molybdenum powder, and chromium powder as raw materials. Made from these special materials and with appropriate formulation control, it achieves good thermal conductivity, mechanical properties, and stability, making it suitable for ultrasonic welding. In the lithium battery manufacturing industry, using this ceramic welding base for ultrasonic welding allows it to withstand high-frequency ultrasonic vibrations, reduces adhesion during welding, and maintains stability over a long period, thus improving the service life of the ceramic welding base. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a ceramic welding socket suitable for ultrasonic welding, provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the preparation process of a ceramic welding base suitable for ultrasonic welding provided in an embodiment of the present invention;

[0024] in, Figure 1 Middle: 1-tooth-shaped machined surface. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0027] In a first aspect, the present invention provides a ceramic welding base suitable for ultrasonic welding, wherein the ceramic welding base comprises the following raw materials in parts by weight:

[0028] 70-80 parts of alumina powder, 20-30 parts of tungsten powder, 5-8 parts of molybdenum powder, and 15-20 parts of chromium powder.

[0029] This invention provides a ceramic welding base suitable for ultrasonic welding. The ceramic welding base uses a specific ratio of alumina powder, tungsten powder, molybdenum powder, and chromium powder as raw materials. Made from these special materials and with appropriate formulation control, it achieves good thermal conductivity, mechanical properties, and stability, making it suitable for ultrasonic welding. In the lithium battery manufacturing industry, using this ceramic welding base for ultrasonic welding allows it to withstand high-frequency ultrasonic vibrations, reduces adhesion during welding, and maintains stability over a long period, thus improving the service life of the ceramic welding base.

[0030] In some specific embodiments, preferably, the ceramic welding base comprises the following raw materials in parts by weight:

[0031] 75 parts alumina powder, 25 parts tungsten powder, 6.25 parts molybdenum powder and 18.75 parts chromium powder.

[0032] In some specific embodiments, the alumina powder has a particle size of 6000-8000 mesh, the tungsten powder has a particle size of 6000-8000 mesh, the molybdenum powder has a particle size of 6000-8000 mesh, and the chromium powder has a particle size of 6000-8000 mesh.

[0033] Secondly, based on a general inventive concept, the present invention provides a method for preparing a ceramic welding base suitable for ultrasonic welding as described in any one of the first aspects, the method comprising the following steps:

[0034] Alumina powder, tungsten powder, molybdenum powder and chromium powder are mixed to obtain a mixed powder.

[0035] The mixed powder is placed in a welding base mold and pressed, and then sintered to obtain a crude ceramic welding base.

[0036] The rough ceramic welding base is then precision machined to obtain a ceramic welding base suitable for ultrasonic welding.

[0037] The method for preparing a ceramic welding base for ultrasonic welding provided by this invention is simple to operate, requires no additional specific equipment, and is suitable for mass industrial production. Furthermore, this preparation method is based on the ceramic welding base for ultrasonic welding described in any one of the first aspects. Therefore, it possesses at least the beneficial effects of the embodiments described in any one of the first aspects, which will not be elaborated further here.

[0038] In some specific embodiments, the operating parameters of the pressing include a pressure of 185-220 MPa.

[0039] In some specific embodiments, the sintering operating parameters include: a temperature of 1680-1700℃ and a time of 2-3 hours.

[0040] In some specific embodiments, the step of refining the rough ceramic welding base to obtain a ceramic welding base suitable for ultrasonic welding includes the following processes:

[0041] The rough ceramic welding base is precisely machined in terms of its external dimensions and the tooth profile of its upper surface using a CNC grinding machine (i.e., as shown in Figure 1). Figure 1 The tooth profile of the tooth profile 1 is machined to obtain a ceramic welding seat suitable for ultrasonic welding; wherein the tooth profile is a pyramid-shaped matrix with a length of 1mm, a width of 1mm, a height of 0.43mm, and a left and right interval of 0.2mm, and the surface is controlled at Ra0.8.

[0042] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed according to national standards. If no corresponding national standard exists, then generally accepted international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0043] Example 1

[0044] This example provides a ceramic welding socket suitable for ultrasonic welding, such as... Figure 1 and Figure 2 As shown, its main preparation process includes the following steps:

[0045] Step (1) Material preparation: Alumina powder, tungsten powder, molybdenum powder, and chromium powder are used as the materials for preparing the ceramic welding base; this material has good high temperature resistance, corrosion resistance, and mechanical strength. This ceramic material can withstand the action of high-frequency ultrasonic vibration, is not prone to sticking during the welding process, and can maintain its stability for a long time;

[0046] Step (2), Mixing: Weigh the raw materials by weight as follows: 75 parts of alumina powder (6000-8000 mesh), 25 parts of tungsten powder (6000-8000 mesh), 6.25 parts of molybdenum powder (6000-8000 mesh), and 18.75 parts of chromium powder (6000-8000 mesh). Dry the raw materials and mix them evenly to obtain a mixture.

[0047] Step (3), solder pad preparation:

[0048] 3.1 Pressing: Place the mixed powder obtained in step (2) into the welding base mold and press the mixture using a press. During the pressing process, apply appropriate pressure gradually according to the size and requirements of the welding base. In this example, the size of the welding base is 66*16*30, and the pressing pressure is 185-220MPa.

[0049] 3.2 Sintering: The pressed welding base is placed in a high-temperature sintering furnace for sintering. The sintering temperature range is 1690℃ and the sintering time is 2.5 hours. After sintering, the base is cooled and removed to obtain a rough ceramic welding base.

[0050] Step (4) Finishing: Using precision machining equipment and CNC grinding machine, the rough ceramic welding base obtained in step (3) is precisely sized and the upper plane tooth is machined. The tooth is machined into a pyramid-shaped matrix with a length of 1mm, width of 1mm, height of 0.43mm and a left and right spacing of 0.2mm. The surface is controlled at Ra0.8.

[0051] Example 2

[0052] This example provides a ceramic welding base suitable for ultrasonic welding. The only difference from Example 1 is that in step (2), the ceramic welding base includes the following raw materials by weight: 70 parts of alumina powder, 20 parts of tungsten powder, 5 parts of molybdenum powder and 15 parts of chromium powder; the remaining steps and parameters are the same.

[0053] Example 3

[0054] This example provides a ceramic welding base suitable for ultrasonic welding. The only difference from Example 1 is that in step (2), the ceramic welding base includes the following raw materials by weight: 80 parts of alumina powder, 30 parts of tungsten powder, 8 parts of molybdenum powder and 20 parts of chromium powder; the remaining steps and parameters are the same.

[0055] Comparative Example 1

[0056] This example provides a ceramic welding base for ultrasonic welding, which differs from Example 1 only in that the alumina powder content is 0 parts; all other steps and parameters are the same.

[0057] Comparative Example 2

[0058] This example provides a ceramic welding base for ultrasonic welding, which differs from Example 1 only in that the tungsten powder content is 0 parts; all other steps and parameters are the same.

[0059] Comparative Example 3

[0060] This example provides a ceramic welding base for ultrasonic welding, which differs from Example 1 only in that the amount of molybdenum powder is 0 parts; all other steps and parameters are the same.

[0061] Comparative Example 4

[0062] This example provides a ceramic welding base for ultrasonic welding, which differs from Example 1 only in that the chromium powder content is 0 parts; all other steps and parameters are the same.

[0063] Comparative Example 5

[0064] This example provides a ceramic welding base for ultrasonic welding, which differs from Example 1 only in that: in step (2): by weight, the ceramic welding base includes the following raw materials: 75 parts of alumina powder, 25 parts of tungsten powder, 18.75 parts of molybdenum powder and 6.25 parts of chromium powder; the remaining steps and parameters are the same.

[0065] Test Example 1

[0066] This example demonstrates the performance testing of the ceramic welding bases obtained in Examples 1-3 and Comparative Examples 1-5. The test results are shown in Tables 1-3.

[0067] Test methods: 1) Ultrasonic welding test: characterized by welding residue; 2) Service life test: characterized by the number of uses; 3) Physical stability test: whether there is adhesion and chipping.

[0068] Table 1. Results of Ultrasonic Welding Tests

[0069] Ceramic welding base under test sample Test Results Example 1 85% welding residue Example 2 90% welding residue Example 3 85% welding residue Comparative Example 1 90% welding residue Comparative Example 2 90% welding residue Comparative Example 3 90% welding residue Comparative Example 4 90% welding residue Comparative Example 5 90% welding residue

[0070] Table 2 Service life test results

[0071] Ceramic welding base under test sample Test Results Example 1 80,000 times Example 2 60,000 times Example 3 60,000 times Comparative Example 1 10,000 times Comparative Example 2 40,000 times Comparative Example 3 30,000 times Comparative Example 4 20,000 times Comparative Example 5 50,000 times

[0072] Table 3 Results of Physical Stability Tests

[0073] Ceramic welding base under test sample Test Results Example 1 No sticking and no chipping Example 2 No sticking and no chipping Example 3 No sticking and no chipping Comparative Example 1 Sticky Comparative Example 2 There is porcelain lining Comparative Example 3 There is porcelain lining Comparative Example 4 There is porcelain lining Comparative Example 5 No sticking and no chipping

[0074] In summary, the embodiments of the present invention provide a ceramic welding base suitable for ultrasonic welding and a method for preparing the same, which has at least the following beneficial effects:

[0075] 1) Reduce adhesion during welding and improve welding quality: Welding bases made of special ceramic materials can effectively reduce adhesion, ensure stable contact between the workpiece and the welding base during welding, and improve welding quality and consistency.

[0076] 2) Long service life: Leveraging the advantages of ceramic materials such as high temperature resistance, corrosion resistance, and mechanical strength, the welding socket of this patent has a long service life. It can withstand the effects of high-frequency ultrasonic vibration without being easily damaged, thereby reducing the frequency of welding socket replacement and lowering production costs.

[0077] 3) Physical stability: Ceramic materials have good physical stability and mechanical properties, which can maintain the stability of shape and structure during welding, and are not easily deformed or damaged, thus ensuring the accuracy and consistency of welding.

[0078] Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible subranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the range referred to.

[0079] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A ceramic welding socket suitable for ultrasonic welding, characterized in that, The ceramic bonding pad is composed of the following raw materials in parts by weight: 70-80 parts of alumina powder, 20-30 parts of tungsten powder, 5-8 parts of molybdenum powder, and 15-20 parts of chromium powder; The alumina powder has a particle size of 6000-8000 mesh, the tungsten powder has a particle size of 6000-8000 mesh, the molybdenum powder has a particle size of 6000-8000 mesh, and the chromium powder has a particle size of 6000-8000 mesh.

2. The ceramic welding socket suitable for ultrasonic welding according to claim 1, characterized in that, The ceramic bonding pad is composed of the following raw materials in parts by weight: 75 parts alumina powder, 25 parts tungsten powder, 6.25 parts molybdenum powder and 18.75 parts chromium powder.

3. A method for preparing a ceramic welding seat suitable for ultrasonic welding as described in any one of claims 1 to 2, characterized in that, The preparation method includes the following steps: Alumina powder, tungsten powder, molybdenum powder and chromium powder are mixed to obtain a mixed powder. The mixed powder is placed in a welding base mold and pressed, and then sintered to obtain a crude ceramic welding base. The rough ceramic welding base is then precision machined to obtain a ceramic welding base suitable for ultrasonic welding.

4. The preparation method according to claim 3, characterized in that, The operating parameters for the pressing include: pressure of 185-220 MPa.

5. The preparation method according to claim 3, characterized in that, The sintering parameters include: a temperature of 1680-1700℃ and a time of 2-3 hours.

6. The preparation method according to claim 3, characterized in that, The steps of refining the rough ceramic welding base to obtain a ceramic welding base suitable for ultrasonic welding include the following processes: The rough ceramic welding base is precisely dimensionally machined and the upper surface tooth profile is machined using a CNC grinding machine to obtain a ceramic welding base suitable for ultrasonic welding. The tooth profile is a pyramid-shaped matrix with a length of 1mm, a width of 1mm, and a height of 0.43mm, and a left and right spacing of 0.2mm. The surface is controlled at Ra0.8.

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