Electrode component welding and cavity sealing integrated forming method and tool jig

Abstract

The invention relates to the technical field of battery electrode sealing, in particular to an electrode component welding and cavity sealing integrated forming method and a tool jig, the tool jig comprises an electrode body and a tool assembly, the electrode body comprises an electrode main body electrode bar, a cap-shaped electrode accessory, a ceramic insulating ring and a cylindrical electrode accessory, one end of the electrode main body electrode bar is provided with an end head, the electrode main body electrode bar sequentially penetrates through the cap-shaped electrode accessory, the ceramic insulating ring and the cylindrical electrode accessory, and the silver-copper brazing electrode is different from the situation that laser welding is used for welding accessories in the current market, so that the appearance is poor (the phenomena of weld beading, weld scars and the like exist); in addition, on the premise that the use functionality of the electrode with the strength is guaranteed, the needed air tightness requirement can be met, the air tightness requirement needed by the type of products cannot be met through laser welding, the method that the microcrystalline glass and the aluminum oxide ceramic ring are used for filling and sealing can not only meet the requirement of the electrode for insulativity, but also meet the requirement of the electrode for gas tightness. And batch sealed production can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of battery electrode sealing, and in particular to an electrode component welding and cavity sealing integrated molding method and a tooling fixture. Background Art

[0002] With the development and improvement of battery technology, new energy batteries have been widely used in various fields, such as electric vehicles, renewable energy storage, portable electronic devices, aerospace, etc. However, no matter what type of battery, the demand for battery electrodes is necessary. With the development of technology, the requirements for electrodes are getting higher and higher, so the technology for electrode sealing has become a top priority. The technology of sealing electrodes is affected by many factors, including battery performance, safety, progress in materials science, production processes, environmental regulations, and the expansion of application areas.

[0003] Currently, the welding method for electrode components on the market is basically laser welding. Laser welding is not only inefficient, but also has mediocre results after welding. Weld scars affect the appearance. From a functional point of view, laser welding has the problem of incomplete welding and air leakage. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides an electrode component welding and cavity sealing integrated molding method and a tooling fixture.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a tooling jig for electrode component welding and cavity sealing, comprising an electrode body and a tooling assembly, the electrode body comprising an electrode main body electrode rod, a cap-shaped electrode accessory, a ceramic insulating ring and a cylindrical electrode accessory, a terminal being arranged at one end of the electrode main body electrode rod, the electrode main body electrode rod sequentially passing through the cap-shaped electrode accessory, the ceramic insulating ring and the cylindrical electrode accessory, the cap-shaped electrode accessory, the ceramic insulating ring and the cylindrical electrode accessory being arranged in concentric circles, a gap being arranged between the cylindrical electrode accessory and the electrode main body electrode rod, a filler being arranged in the gap, the tooling assembly comprising an electrode positioning base, a concentric positioning ring, a counterweight block and a filler pressing block, an assembly groove being arranged on the front side of the electrode positioning base, a concentric positioning ring for positioning the electrode body being further arranged in the assembly groove, a filler pressing block being further arranged at the end of the electrode body away from the electrode positioning base, and a counterweight block being further arranged at the end of the filler pressing block away from the electrode positioning base.

[0008] Preferably, first mounting holes are also provided at the four corners of the electrode positioning base.

[0009] Preferably, second mounting holes are provided at the four corners of the counterweight block.

[0010] Preferably, the cross section of the counterweight block is T-shaped with a through hole arranged in the center.

[0011] Preferably, the filler includes ceramic filling rings and glass rings, and several groups of the ceramic filling rings and glass rings are arranged alternately.

[0012] Preferably, the counterweight block is made of stainless steel, and the electrode positioning base, the concentric positioning ring and the packing block are made of graphite.

[0013] The present invention further provides an electrode component welding and cavity sealing integrated forming method, comprising the following steps:

[0014] Step 1: Place the electrode body and electrode rod into the atopic tooling, and place the corresponding silver-copper solder ring between each accessory;

[0015] Step 2, fill the electrode cavity of the electrode body, preferably put a glass ring, then put a ceramic ring, repeat three times until the electrode cavity is filled, and then use a filler block to press on the filler;

[0016] Step 3: After covering the counterweight, push the equipment into the partitioned high-temperature push boat furnace. The brazing temperature is 850-900°C, the brazing atmosphere is a nitrogen-hydrogen mixed gas with a ratio of 2:8, and the heating time is 50-70 minutes.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides an electrode component welding and cavity sealing integrated molding method and tooling, which has the following beneficial effects:

[0019] The electrode component welding and cavity sealing integrated molding method and tooling fixture use silver-copper brazing electrodes, which are different from the poor appearance (weld nodules, weld scars, etc.) caused by the use of laser welding to weld accessories on the market. In addition, while ensuring the functionality of the strong electrode, the required airtightness requirements can be achieved. Laser welding cannot achieve the airtightness requirements required for such products. The method of using microcrystalline glass and alumina ceramic rings for filling and sealing can not only ensure the insulation requirements of the electrode, but also can be sealed and produced in batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the explosion of the structure of the present invention without filler;

[0022] Figure 3 It is a partial explosion schematic diagram of the structure of the present invention.

[0023] In the figure: 1. Electrode body electrode rod; 2. Cap-shaped electrode accessories; 3. Ceramic insulating ring; 4. Cylindrical electrode accessories; 5. Electrode positioning base; 6. Concentric positioning ring; 7. Counterweight block; 8. Filling block; 9. First mounting hole; 10. Second mounting hole; 11. Ceramic filling ring; 12. Glass ring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-3 , a tooling jig for electrode component welding and cavity sealing, comprising an electrode body and a tooling assembly, the electrode body comprising an electrode body electrode rod 1, a cap-shaped electrode accessory 2, a ceramic insulating ring 3 and a cylindrical electrode accessory 4, one end of the electrode body electrode rod 1 is provided with a terminal, the electrode body electrode rod 1 passes through the cap-shaped electrode accessory 2, the ceramic insulating ring 3 and the cylindrical electrode accessory 4 in sequence, the cap-shaped electrode accessory 2, the ceramic insulating ring 3 and the cylindrical electrode accessory 4 are arranged in concentric circles, a gap is provided between the cylindrical electrode accessory 4 and the electrode body electrode rod 1, a filler is provided in the gap, the tooling assembly comprises an electrode positioning base 5, a concentric positioning ring 6, a counterweight block 7 and a filler pressing block 8, an assembly groove is provided on the front of the electrode positioning base 5, a concentric positioning ring 6 for positioning the electrode body is also provided in the assembly groove, a filler pressing block 8 is also provided on the end of the electrode body away from the electrode positioning base 5, and a counterweight block 7 is also provided on the end of the filler pressing block 8 away from the electrode positioning base 5.

[0026] The assembly groove of the electrode positioning base 5 is matched with a concentric positioning ring 6, which can accurately clamp the electrode body to ensure that the various components of the electrode body are in the correct concentric position during the assembly process to prevent assembly deviation, which is extremely critical for subsequent welding and sealing molding, because position deviation may lead to problems such as loose welding and loose sealing;

[0027] The packing block 8 is placed at one end of the electrode body away from the electrode positioning base 5. It can apply uniform pressure to the ceramic filling ring 11 and the glass ring 12 filled in, so that the packing distribution is tighter and the sealing effect is improved. The counterweight block 7 is arranged on the packing block 8. Its cross section is an inverted T-shape with a through hole in the center. It can use its own weight to press down evenly to further compact the packing. It can also stabilize the entire electrode component structure during subsequent high-temperature treatment to avoid component displacement due to thermal expansion and other reasons. The first mounting holes 9 at the four corners of the electrode positioning base 5 facilitate the installation of the entire tooling fixture on the external operating platform;

[0028] The electrode positioning base 5, the concentric positioning ring 6 and the packing block 8 are made of graphite. Graphite is resistant to high temperatures and has stable chemical properties. It can withstand the harsh environment of subsequent high-temperature brazing and is not easy to react chemically with electrode components. The counterweight block 7 is made of stainless steel. Stainless steel has a certain weight to meet the counterweight requirements. It also has good mechanical properties and corrosion resistance and can be used stably for a long time.

[0029] The counterweight block 7 is also provided with second mounting holes 10 at the four corners for easy assembly with external equipment;

[0030] The electrode rod 1 of the electrode body is the core component, and the end of one end plays a key role in conduction. It passes through the cap-shaped electrode accessory 2, the ceramic insulating ring 3 and the cylindrical electrode accessory 4 in sequence, and these accessories are arranged in concentric circles. This concentric structure can ensure the stability of power transmission when the electrode is in use, and avoid the problem of uneven electric field caused by eccentricity. A gap is reserved between the cylindrical electrode accessory 4 and the electrode body electrode rod 1, and the gap is used to place fillers;

[0031] The filler is composed of staggered ceramic filling rings 11 and glass rings 12. The ceramic filling rings 11 have good insulation and high temperature resistance, and the glass rings 12 can soften and flow at high temperatures to fill small gaps. The combination of the two can not only enhance the insulation effect of the electrode components, but also assist in sealing the cavity in the subsequent high-temperature brazing process to prevent the intrusion of external gases and the like that affect the electrode performance and ensure the stability of the internal environment of the electrode.

[0032] Preferably, the electrode positioning base 5 is further provided with first mounting holes 9 at four corners.

[0033] Preferably, the counterweight block 7 is further provided with second mounting holes 10 at four corners.

[0034] Preferably, the cross section of the counterweight block 7 is T-shaped with a through hole arranged in the center.

[0035] Preferably, the filler includes ceramic filling rings 11 and glass rings 12, and several groups of the ceramic filling rings 11 and glass rings 12 are arranged alternately.

[0036] Preferably, the counterweight block 7 is made of stainless steel, and the electrode positioning base 5, the concentric positioning ring 6 and the filler pressing block 8 are made of graphite.

[0037] The present invention further provides an electrode component welding and cavity sealing integrated forming method, comprising the following steps:

[0038] Step 1: Place the electrode rod 1 of the electrode body into the atopic tooling, and place the corresponding silver-copper solder ring between each accessory. The silver-copper solder ring, as a soldering material, will melt in a subsequent high-temperature environment. The capillary action of the liquid solder is used to fill the tiny gaps between the connecting parts of the electrode accessories, so that the cap-shaped electrode accessory 2, the ceramic insulating ring 3, the cylindrical electrode accessory 4 and the electrode body electrode rod 1 are firmly welded together to form a stable electrode structure.

[0039] Step 2: Fill the electrode cavity of the electrode body with material, first put in the glass ring 12, use the glass ring 12 to initially position it, then put in the ceramic ring, and fill the cavity with the two three times. The glass ring 12 is relatively soft and can better fit the cavity wall, while the ceramic ring strengthens the overall structure, and then compacts it with the filler block 8 to make the filler evenly and tightly distributed, creating good conditions for subsequent sealing;

[0040] Step 3, cover the counterweight 7 and push the equipment into the partitioned high-temperature push boat furnace. At a brazing temperature of 850-900°C, the silver-copper solder ring melts to achieve welding; nitrogen-hydrogen mixed gas (ratio 2:8) is used as a brazing atmosphere, which can not only prevent oxidation of the electrode components, but also provide a suitable chemical environment for the brazing reaction to ensure welding quality. The heating time of 50-70 minutes is enough to allow the solder to fully flow and solidify to complete the welding. At the same time, the high temperature causes the glass ring 12 to soften and flow, and cooperates with the ceramic filling ring 11 to complete the cavity sealing, realizing the welding of the electrode components and the cavity sealing molding in one piece.

[0041] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0042] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0043] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A tooling fixture for integrated electrode component welding and cavity sealing, comprising an electrode body and a tooling assembly, characterized in that: The electrode body comprises an electrode main body electrode rod (1), a cap-shaped electrode accessory (2), a ceramic insulating ring (3) and a cylindrical electrode accessory (4); one end of the electrode main body electrode rod (1) is provided with a terminal; the electrode main body electrode rod (1) passes through the cap-shaped electrode accessory (2), the ceramic insulating ring (3) and the cylindrical electrode accessory (4) in sequence; the cap-shaped electrode accessory (2), the ceramic insulating ring (3) and the cylindrical electrode accessory (4) are arranged in concentric circles; a cylindrical electrode accessory (4) is provided between the electrode main body electrode rod (1) and the cylindrical electrode accessory (4); A gap is provided, and a filler is provided in the gap. The tooling assembly comprises an electrode positioning base (5), a concentric positioning ring (6), a counterweight (7) and a filler pressing block (8). The electrode positioning base (5) is provided with an assembly groove on the front side, and a concentric positioning ring (6) for positioning the electrode body is also provided in the assembly groove. A filler pressing block (8) is also provided at one end of the electrode body away from the electrode positioning base (5), and a counterweight (7) is also provided at one end of the filler pressing block (8) away from the electrode positioning base (5).

2. The tooling fixture for electrode component welding and cavity sealing as one piece according to claim 1, characterized in that: The electrode positioning base (5) is also provided with first mounting holes (9) at four corners.

3. The tooling fixture for electrode component welding and cavity sealing as one piece according to claim 2, characterized in that: Second mounting holes (10) are also provided at the four corners of the counterweight block (7).

4. The tooling fixture for electrode component welding and cavity sealing as one piece according to claim 3, characterized in that: The cross section of the counterweight block (7) is T-shaped with a through hole arranged in the center.

5. The tooling fixture for electrode component welding and cavity sealing as one piece according to claim 4, characterized in that: The filler comprises ceramic filling rings (11) and glass rings (12), and a plurality of groups of the ceramic filling rings (11) and glass rings (12) are arranged in a staggered manner.

6. The tooling fixture for electrode component welding and cavity sealing as one piece according to claim 5, characterized in that: The counterweight block (7) is made of stainless steel, and the electrode positioning base (5), the concentric positioning ring (6) and the filler pressing block (8) are made of graphite.

7. A method for integrated electrode component welding and cavity sealing, comprising a tooling jig for integrated electrode component welding and cavity sealing as claimed in any one of claims 1 to 6, characterized in that: The steps include: Step 1: Place the electrode body electrode rod (1) into the atopic tooling, and place the corresponding silver-copper solder ring between each accessory; Step 2, filling the electrode cavity of the electrode body, preferably placing a glass ring (12), and then placing a ceramic ring, repeating this process three times until the electrode cavity is filled, and then using a filling block (8) to press on the filling; Step 3: After covering the counterweight block (7), push the equipment into a partitioned high-temperature push boat furnace. The brazing temperature is 850-900°C, the brazing atmosphere is a nitrogen-hydrogen mixed gas with a ratio of 2:8, and the heating time is 50-70 minutes.

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