Blade battery ceramic sealing connector negative terminal and preparation method

Abstract

The application discloses a ceramic sealing connector negative terminal for blade battery and a preparation method, and comprises the following steps: S1, ingredient preparation; S2, dry pressing forming; S3, high-temperature sintering; S4, surface finishing; S5, metallization and nickel plating; S6, assembly brazing and cap processing. When the ceramic sealing connector negative terminal is prepared, the preparation process of the alumina ceramic ring is optimized, the sintering activity is improved and the temperature is reduced by adopting titanium sol to coat alumina powder, meanwhile, the titanium sol particles fill the pores and the anti-wrinkling property is enhanced. Meanwhile, the addition of nano silicon dioxide further refines the crystal grains, and the strength and toughness of the ceramic ring are improved. In addition, the modifier MgO is introduced to inhibit the grain growth and generate MgAl2O4 second phase, so that the glass phase component and the viscosity are improved, the anti-pollution ability of the ceramic ring is enhanced, and the problem of poor pressure drop is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic packaging, in particular to a ceramic sealing connector negative terminal for a blade battery and a preparation method thereof. BACKGROUND

[0002] A blade battery is a long strip-shaped battery, named for its flat shape. This design enables the blade battery to provide higher energy density and greater current output, while being easily integrated into various devices and systems. The use of a ceramic sealing connector negative terminal by a blade battery refers to the use of a sealing connector made of a ceramic material at the negative terminal of the battery. This connector is usually located at the bottom of the battery and is responsible for connecting the negative terminal inside the battery to the external circuit, providing good sealing performance to ensure the safe operation of the battery.

[0003] However, the existing ceramic sealing connector negative terminal of the blade battery has some problems. The traditional circular structure of the ceramic sealing element is prone to increase the weight and space occupation, which limits the application of the blade battery in lightweight design and space-limited environments. In addition, the anti-pollution, anti-wrinkle and pressure drop performance of the ceramic sealing element is insufficient, which makes the ceramic sealing connector negative terminal susceptible to pollution and deformation during use, and increases the energy consumption when fluid passes through, thus limiting its reliability and performance in applications such as blade batteries. SUMMARY

[0004] The purpose of the present application is to provide a ceramic sealing connector negative terminal for a blade battery and a preparation method thereof to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The present application provides a preparation method of a ceramic sealing connector negative terminal for a blade battery, comprising the following steps:

[0007] S1, preparation of ingredients: weigh 60-80 parts of Al2O3 powder, 3-5 parts of talc powder, 3-5 parts of ZrO2 powder, 20-30 parts of nano-silicon dioxide, 2-5 parts of rare earth oxide, 0.6-0.8 parts of modifier MgO and 3-5 parts of sintering aid CaCO3, and coat the Al2O3 powder with titanium sol, mix the above ingredients and put them into a 180℃ oven for 16 hours, cancel the ball milling and directly stir the mixed powder for 3-6 hours, then spray granulation, control the granulation particles to be spherical, and obtain the mixed particles;

[0008] S2, dry pressing: use a servo electric press to dry press the mixed particles at 8MPa to obtain an oval blank ring;

[0009] S3, high-temperature sintering: the oval blank ring is sintered into a porcelain alumina ceramic ring at a high temperature, the sintering temperature is controlled at 1400-1700℃, and the density of the blank after sintering is ensured to be greater than 3.72g / cm3, and the shrinkage rate is between 15%-20%;

[0010] S4, surface finishing: the surface of the alumina ceramic ring after sintering is polished to control the surface roughness to be 0.8-1.5μm;

[0011] S5, metallization and nickel plating: a 90-mesh screen is used to print a metalized paste on the surface of the alumina ceramic ring, the printed layer thickness is controlled to be 30-80μm, then the printed alumina ceramic ring is sintered at a high temperature in a protective atmosphere, the temperature is controlled at 1500-1600℃, and sintering is performed for 5 hours, and after sintering, the temperature is kept for at least 1 hour to form a uniform metalized layer, then the sintered alumina ceramic ring is placed in a plating tank for chemical nickel plating treatment, the temperature is controlled at 70-80℃, and the time is 30-60 minutes, so that a nickel layer is formed on the metalized layer;

[0012] S6, assembly brazing and cap machining: an oxygen-free copper column is inserted into the inner hole of the alumina ceramic ring, the ceramic ring and the oxygen-free copper column are brazed together using a brazing process to obtain a connector assembly, cap machining is performed on the connector assembly, and a nickel cap is stamped onto the oxygen-free copper column.

[0013] As a further scheme of the present application, in step S5, the preparation method of the metalized paste is as follows: 60-80 parts of spherical Mo powder, 7.2-16 parts of Mn powder and 4.8-16 parts of mixed particles of alumina ceramic ingredients are weighed, then the above powders and particles are mixed to obtain a mixture, 2-3 times the weight of the mixture of agate balls and 0.2-0.3 times the weight of the mixture of epoxy resin solution are added, and the mixture is rolled in a corundum jar for 13-14 hours to obtain the metalized paste.

[0014] As a further scheme of the present application, in step S5, the protective atmosphere used is one of ammonia decomposition gas, nitrogen and argon.

[0015] As a further scheme of the present application, in step S5, the thickness of the metalized layer is 15-40μm, and the thickness of the nickel layer is 5-10μm.

[0016] As a further scheme of the present application, in step S6, the solder used in the brazing process is 72 silver solder, the welding temperature is controlled at 600-800℃, the welding time is 5-30 minutes, the welding holding time is 2-10 minutes, and the atmosphere is vacuum or inert gas atmosphere.

[0017] The application further provides a ceramic sealing connector negative terminal for a blade battery, which is prepared by the preparation method and comprises a metallized ceramic ring, a copper core column and a nickel cap.

[0018] As a further scheme of the application, the metallized ceramic ring is an elliptical ring.

[0019] As a further scheme of the application, the inner diameter of the metallized ceramic ring is greater than the outer diameter of the copper core column.

[0020] As a further scheme of the application, two identical poles are symmetrically arranged at the top of the copper core column.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] 1. In the preparation of the ceramic sealing connector negative terminal, the alumina powder is coated with titanium sol during the preparation of the alumina ceramic ring, so that the sintering activity of the alumina is improved and the sintering temperature is reduced, and the titanium sol is stripped from the surface of the alumina powder into fine particles during the sintering process, filling the pores in the ceramic material and enhancing the wrinkle resistance of the ceramic ring.

[0023] 2. In the preparation of the ceramic sealing connector negative terminal, the addition of the modifier MgO during the preparation of the alumina ceramic ring introduces magnesium elements, which can inhibit the excessive growth of the crystal grains during the sintering process and generate the second phase MgAl2O4 phase, which improves the glass phase composition and viscosity and further improves the anti-pollution ability of the ceramic ring and improves the pressure drop.

[0024] 3. The metallized ceramic ring structure of the ceramic sealing connector negative terminal for a blade battery is changed from a common circular shape to an elliptical shape, which reduces the weight and space ratio of the entire connector negative terminal. This design can better match the integrity of the blade battery, and after being assembled into the blade module, the overall height of the battery is reduced due to the effective use of space by the elliptical structure, thereby reducing the weight ratio and volume ratio of the battery module in the whole vehicle, reducing the weight of the whole vehicle, and further reducing the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0025] The application will be further described below with reference to the drawings.

[0026] Figure 1It is a flow chart of the preparation method of the ceramic sealing connector negative terminal for blade battery.

[0027] Figure 2 It is a schematic diagram of the overall structure of the ceramic sealing connector negative terminal.

[0028] Figure 3 It is a schematic diagram of the overall structure of the ceramic sealing connector negative terminal.

[0029] Figure 4 It is a schematic diagram of the overall structure of the ceramic sealing connector negative terminal.

[0030] In the figure: 1, metallized ceramic ring; 2, copper core column; 3, nickel cap. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Embodiment one:

[0033] As shown in the figure, the preparation method of the ceramic sealing connector negative terminal for blade battery comprises the following steps: Figure 1

[0034] S1, S1, batching and preparation: weighing 60-80 parts of Al2O3 powder, 3-5 parts of talc powder, 3-5 parts of ZrO2 powder, 20-30 parts of nano-silicon dioxide, 2-5 parts of rare earth oxide, 0.6-0.8 parts of modifier MgO and 3-5 parts of sintering aid CaCO3, and coating the Al2O3 powder with titanium sol, mixing the above components and putting them into a 180℃ baking oven for baking for 16 hours, directly stirring the mixed powder for 3-6 hours without ball milling, and then spray granulating to control the granulated particles to be spherical, obtaining mixed particles. Coating the alumina powder with titanium sol can improve the sintering activity of alumina and reduce the sintering temperature, enhance the wrinkle resistance of the ceramic ring, and adding nano-silicon dioxide can improve the strength and toughness of the ceramic ring, further enhancing the wrinkle resistance; adding the modifier MgO in the preparation process of the alumina ceramic ring to introduce magnesium element can inhibit the excessive growth of the crystal grains during the sintering process, generating the second phase MgAl2O4 phase, which improves the glass phase composition and viscosity, and further improves the anti-pollution ability of the ceramic ring and improves the pressure drop defect.

[0035] ​S2, dry pressing: using a servo motor press to dry pressing the mixed particles at 8 MPa, get the elliptical blank ring; this makes the shape of the blank ring elliptical, rather than the traditional circular, such shape better adapts to the overall structure of the blade battery, can reduce the weight and space ratio of the connector, so as to improve the overall matching and sealing performance of the connector.

[0036] S3, high temperature sintering: the elliptical blank ring is sintered at high temperature to get the alumina ceramic ring, the sintering temperature is controlled at 1400-1700℃, to ensure the density of the blank after sintering is greater than 3.72g / cm³, and the shrinkage rate is between 15%-20%; control the sintering temperature and density and shrinkage rate to ensure the formation of stable alumina ceramic ring, with good anti-wrinkling and mechanical properties.

[0037] S4, surface finishing: the surface of the alumina ceramic ring sintered to porcelain is polished to control the surface roughness to 0.8-1.5μm; controlling the surface roughness within a suitable range is conducive to the subsequent metallization and nickel plating process, and improves the bonding force between the metal layer and the ceramic matrix.

[0038] S5, metallization and nickel plating: using 90 mesh screen printing metallization paste on the surface of the alumina ceramic ring, controlling the printing layer thickness to 30-80μm, then sintering the printed alumina ceramic ring at high temperature in a protective atmosphere, controlling the temperature at 1500-1600℃, sintering for 5 hours, and keeping the temperature for at least 1 hour after sintering, to form a uniform metallization layer, then putting the sintered alumina ceramic ring into the plating tank for chemical nickel plating treatment, controlling the temperature at 70-80℃, and the time at 30-60 minutes, to form a layer of nickel on the metallization layer. Printing metallization paste forms a uniform metallization layer, improving the conductivity and corrosion resistance of the connector, high temperature sintering in a protective atmosphere can ensure good bonding between the metallization layer and the ceramic matrix, avoiding oxidation and contamination, controlling the thickness of the metallization layer and the nickel layer ensures the appropriate thickness of the metallization layer and the nickel layer, further enhancing the corrosion resistance and conductivity of the connector.

[0039] S6, assembly brazing and hat processing: inserting the oxygen-free copper column into the inner hole of the alumina ceramic ring, using brazing process to braze the ceramic ring and the oxygen-free copper column together to get the connector assembly, performing hat processing on the connector assembly, and stamping the nickel cap onto the oxygen-free copper column. The brazing process firmly connects the ceramic ring and the oxygen-free copper column together. This ensures the stability and reliability of the connector. The oxygen-free copper column, as part of the connector, plays an important role in current transmission; before performing hat processing on the connector assembly, the nickel cap is placed on top of the oxygen-free copper column. The covering pressure of the nickel cap will tightly press it onto the oxygen-free copper column to ensure the integrity and electrical performance of the connector, and the nickel plating layer can also improve the corrosion resistance of the connector.

[0040] Specifically, in step S5, the preparation method of the metallized slurry is as follows: 60-80 parts of spherical Mo powder, 7.2-16 parts of Mn powder and 4.8-16 parts of mixed particles of alumina ceramic ingredients are weighed and mixed to obtain a mixture, 2-3 times the weight of the mixture of agate balls and 0.2-0.3 times the weight of the mixture of epoxy resin solution are added, and the mixture is rolled in a corundum jar for 13-14 hours to obtain the metallized slurry.

[0041] Specifically, in step S5, the protective atmosphere used is one of ammonia decomposition gas, nitrogen and argon. These atmospheres help to prevent the alumina ceramic ring from reacting with oxygen in the air during high-temperature sintering, thereby maintaining its purity and stability.

[0042] Specifically, in step S5, the thickness of the metallized layer is 15-40 μm and the thickness of the nickel layer is 5-10 μm. Controlling the thickness of the metallized layer and the nickel layer can optimize the electrical conductivity and corrosion resistance of the connector

[0043] Specifically, in step S6, the solder used in the soldering process is 72 silver solder, the soldering temperature is controlled at 600-800°C, the soldering time is 5-30 minutes, the soldering holding time is 2-10 minutes, and the atmosphere is vacuum or inert gas atmosphere. Using appropriate solder, soldering temperature and atmosphere and other conditions for soldering can ensure the firmness and reliability of the connector assembly.

[0044] Example Two:

[0045] As shown in Figures 2-4 The negative terminal of the ceramic sealed connector for blade battery prepared by the preparation method of Example One above comprises a metallized ceramic ring 1, a copper core column 2 and a nickel cap 3. The metallized ceramic ring 1 is provided with a through hole in the center along the axial direction for the copper core column 2 to pass through. The metallized ceramic ring 1 and the copper core column 2 are soldered together by a soldering process. The copper core column 2 is provided with a notch above the soldering position with the upper surface of the metallized ceramic ring 1 to form a welding gap. The welding gap ensures that the molten metal can fully fill the gap between the ceramic ring and the copper core column during welding, forming a firm welding connection. The nickel cap is installed on the top of the copper core column, which can protect the copper core column from being eroded by the external environment and prolong the service life of the connector.

[0046] Specifically, the metallized ceramic ring 1 is an elliptical ring. The elliptical shape can better adapt to the space layout in the battery module, optimize the space utilization and reduce unnecessary space waste, thereby reducing the volume and weight of the entire battery module.

[0047] Specifically, the inner diameter of the metalized ceramic ring 1 is larger than the outer diameter of the copper core column. It ensures that the copper core column can easily pass through the ceramic ring, avoiding friction and damage during assembly. At the same time, this design also provides enough space for the welding process, ensuring the quality of welding.

[0048] Specifically, the top center of the copper core column is symmetrically provided with two identical poles. These two poles not only enhance the mechanical strength of the copper core column, but also provide stable support for the subsequent installation of the nickel cap; at the same time, they also optimize the transmission path of the current and improve the conductivity.

[0049] The above describes one embodiment of the present application in detail, but the content is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent scope of the present application.

Claims

1. A method of producing a ceramic sealing connector negative terminal for a blade battery, characterized by, It comprises the following steps: S1, ingredient preparation: weigh 60-80 parts of Al2O3 powder, 3-5 parts of talc powder, 3-5 parts of ZrO2 powder, 20-30 parts of nano-silicon dioxide, 2-5 parts of rare earth oxide, 0.6-0.8 parts of modifier MgO and 3-5 parts of sintering aid CaCO3, and coat the Al2O3 powder with titanium sol, mix the above ingredients and put them into an oven at 180℃ for 16 hours, cancel the ball milling and directly stir the mixed powder for 3-6 hours, then spray granulation, control the granulation particles to be spherical, and get the mixed particles; S2, dry pressing: use a servo motor press to dry press the mixed particles at 8MPa to get an oval blank ring; S3, high temperature sintering: sinter the oval blank ring into porcelain to get an alumina ceramic ring, the sintering temperature is controlled at 1400-1700℃, and the density of the blank after sintering is greater than 3.72g / cm3, and the shrinkage rate is between 15%-20%; S4, surface finishing: polish the surface of the sintered alumina ceramic ring, and control the surface roughness to be 0.8-1.5μm; S5, metallization and nickel plating: use a 90-mesh screen to print the metallization paste on the surface of the alumina ceramic ring, control the printed layer thickness to be 30-80μm, then sinter the printed alumina ceramic ring in a protective atmosphere, control the temperature to be 1500-1600℃, sinter for 5 hours, and keep the temperature for at least 1 hour after sintering to form a uniform metallization layer, then put the sintered alumina ceramic ring into a plating tank for chemical nickel plating, control the temperature to be 70-80℃, and the time to be 30-60 minutes, so that a nickel layer is formed on the metallization layer; S6, assembly, brazing and hat processing: insert an oxygen-free copper column into the inner hole of the alumina ceramic ring, use brazing process to braze the ceramic ring and the oxygen-free copper column together to get a connector assembly, perform hat processing on the connector assembly, and stamp the nickel hat onto the oxygen-free copper column.

2. The method of claim 1, wherein the ceramic sealing connector negative terminal for a blade battery is prepared by the steps of: In step S5, the preparation method of the metallization paste is: weigh 60-80 parts of spherical Mo powder, 7.2-16 parts of Mn powder and 4.8-16 parts of mixed particles of alumina ceramic ingredients, then mix the above powders and particles to get a mixture, add 2-3 times the weight of the mixture of agate balls and 0.2-0.3 times the weight of the mixture of epoxy resin solution, roll in a corundum jar for 13-14 hours to get the metallization paste.

3. The method of claim 1, wherein the ceramic sealing connector negative terminal for a blade battery is prepared by the steps of: In step S5, the protective atmosphere used is one of ammonia decomposition gas, nitrogen and argon.

4. The method of claim 1, wherein the ceramic sealing connector negative terminal for a blade battery is prepared by the steps of: In step S5, the thickness of the metallization layer is 15-40μm, and the thickness of the nickel layer is 5-10μm.

5. The method of claim 1, wherein the ceramic sealing connector negative terminal for a blade battery is prepared by the steps of: In step S6, the solder used in the brazing process is 72 silver solder, the welding temperature is controlled at 600-800℃, the welding time is 5-30 minutes, the welding holding time is 2-10 minutes, and the atmosphere is vacuum or inert gas atmosphere.

6. A ceramic sealing connector negative terminal for a coin cell battery prepared by the method of any one of claims 1 to 5, characterized by It comprises a metalized ceramic ring (1), a copper core column (2) and a nickel cap (3), the metalized ceramic ring (1) is provided with a through hole for the copper core column (2) to pass through in the center along the axial direction, the metalized ceramic ring (1) and the copper core column (2) are brazed together through a brazing process, a gap is provided on the copper core column above the welding position with the upper surface of the metalized ceramic ring for welding clearance, and the nickel cap (3) is installed on the top of the copper core column.

7. The blade battery ceramic sealed connector negative terminal according to claim 6, characterized by, The metalized ceramic ring is an elliptical ring.

8. The blade battery ceramic sealed connector negative terminal according to claim 6, wherein The inner diameter of the metalized ceramic ring (1) is greater than the outer diameter of the copper core column (2).

9. The blade battery ceramic sealed connector negative terminal according to claim 6, wherein Two identical polar points are symmetrically arranged on the top center of the copper core column.

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