Electrode assembly, filling tool and preparation method

Abstract

The invention relates to an electrode assembly, a filling tool and a preparation method, the filling tool comprises a jig, the jig comprises a positioning seat and a cover plate, the bottom end of the cover plate is provided with a first clamping surface, and the top end of the positioning seat forms a second clamping surface; a first through hole is formed in the cover plate; the bottom end of the filling head is a filling end, the filling end is used for being inserted into the first through hole, a filling channel is formed in the filling head and provided with an annular discharging port, the annular discharging port is located in the filling end, and the width of the section of the annular discharging port is gradually decreased from top to bottom. The invention also discloses an electrode assembly and a preparation method thereof. The preparation efficiency and the preparation quality of the electrode assembly can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an electrode assembly, filling tooling, and preparation method. Background Technology

[0002] The electrode assembly in a battery is mounted on the casing to electrically connect the internal battery cells and external electrical components. The electrode assembly typically includes terminals, and an insulating component is required between the terminals and the casing to ensure insulation and sealing. Plastic sheets are commonly used as these insulating components; however, plastic components have low temperature resistance and poor corrosion resistance, making them prone to failure under thermal disturbance, humidity, or long-term mechanical stress, thus affecting the sealing and insulation performance of the battery casing and failing to meet the safety requirements of high-power charging and discharging conditions and long-term use safety needs. To solve these problems, glass can be used to replace the plastic sheet for glass sealing of the terminals. However, this sealing structure has low manufacturing efficiency and unstable sealing quality, failing to meet production requirements. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to improve the preparation efficiency and preparation quality of electrode components in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides a filling tooling, comprising,

[0005] The fixture includes a positioning seat and a cover plate. The bottom end of the cover plate has a first clamping surface, and the top end of the positioning seat forms a second clamping surface. A first through hole is provided on the cover plate.

[0006] The filling head has a filling end at its bottom, which is used to insert into the first through hole. The filling head has a filling channel inside, and the filling channel has an annular discharge port located inside the filling end. The cross-sectional width of the annular discharge port decreases from top to bottom.

[0007] In one embodiment of the present invention, the cross-section of the annular discharge port is an isosceles trapezoid.

[0008] In one embodiment of the present invention, the first through hole includes a first accommodating cavity and a second accommodating cavity arranged from top to bottom. The first accommodating cavity is used to accommodate the filling end and is tapered. The filling end is adapted to the shape of the first accommodating cavity. The second accommodating cavity is used to accommodate the electrode assembly.

[0009] In one embodiment of the present invention, the filling end is further provided with a clearance groove, and the annular discharge port surrounds the periphery of the clearance groove.

[0010] In one embodiment of the present invention, the positioning seat is provided with a first positioning groove, and a second clamping surface is formed on the bottom surface of the first positioning groove.

[0011] In one embodiment of the present invention, a second positioning groove is provided inside the first positioning groove.

[0012] This invention also discloses a method for fabricating electrode assemblies using the filling tooling described in any one of the preceding claims, comprising:

[0013] A pole and a sleeve are provided, the sleeve comprising a cylindrical body having a flanged flange at one end;

[0014] The fixture is used to position the pole and the sleeve, such that the flange is clamped between the first clamping surface and the second clamping surface, and the cylinder is located in the first through hole; and the pole is located inside the sleeve, forming an annular filling cavity between the pole and the sleeve.

[0015] Move the filling head so that it is inserted into the first through hole and the annular outlet is positioned above the annular filling cavity;

[0016] Glass raw material is injected into the filling channel inside the filling head, so that the glass raw material is filled into the annular filling cavity through the annular outlet;

[0017] After the filling is completed, the filling head is removed, and the fixture is placed in a heating furnace for heating, so that the glass raw material is melted and the sleeve and the pole are sealed together. The glass raw material between the sealed sleeve and the pole forms a glass ring.

[0018] In one embodiment of the present invention, the glass raw material is a mixture of lead-free glass material and organic binder.

[0019] In one embodiment of the present invention, when the fixture is placed in a heating furnace for heating, so that the glass raw material is melted and the sleeve and the electrode are sealed together, a temperature-controlled heating treatment method is adopted. The temperature-controlled heating treatment method includes controlling the heating rate to 2-5 °C / min, heating to the melting temperature, and maintaining the melting temperature for 10-30 minutes. At the melting temperature, the glass raw material is melted and the sleeve and the electrode are sealed together.

[0020] In one embodiment of the present invention, the melting temperature is 380–520°C.

[0021] In one embodiment of the present invention, after the glass raw material is melted to seal the sleeve and the pole together, a cooling and solidification process is performed. During the cooling and solidification process, the temperature is first lowered to below the melting point of the glass raw material at a rate of 1 to 3 °C / min, and then naturally cooled to room temperature until the glass raw material is completely solidified.

[0022] In one embodiment of the present invention, the thickness of the flange is 50-250 μm, and the edge width of the flange is 0.3-1 mm.

[0023] In one embodiment of the present invention, the positioning seat is provided with a first positioning groove, a second clamping surface is formed on the bottom surface of the first positioning groove, and a second positioning groove is provided inside the first positioning groove. When the fixture is used to position the pole post and the sleeve, the pole post is placed in the second positioning groove, and the flange is placed in the first positioning groove, so that the flange is clamped between the first clamping surface and the second clamping surface.

[0024] In one embodiment of the present invention, after glass raw material is injected into the filling channel in the filling head, external pressure is applied to the injected glass raw material so that the glass raw material is filled into the annular filling cavity through the annular outlet.

[0025] The present invention also discloses an electrode assembly prepared by any of the methods described above, the electrode assembly comprising,

[0026] A sleeve, the sleeve comprising a cylindrical body, one end of which is formed with a flange;

[0027] A pole post, which is located inside the sleeve;

[0028] A glass ring is used to seal the sleeve and the pole.

[0029] The technical solution of the present invention has the following advantages compared with the prior art:

[0030] The electrode assembly, filling tooling, and preparation method described in this invention can effectively improve the filling efficiency and quality of glass raw materials, thereby improving the preparation efficiency and quality of the electrode assembly. Attached Figure Description

[0031] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the structure of an electrode assembly according to an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 A schematic diagram of the electrode assembly from another angle is shown;

[0034] Figure 3 yes Figure 1 Top view of the middle electrode assembly;

[0035] Figure 4 yes Figure 3 Sectional view at point AA;

[0036] Figure 5 This is a schematic diagram of the assembly of the filling tooling and electrode assembly of the present invention;

[0037] Figure 6 yes Figure 5 A magnified view of a section at point M5;

[0038] Figure 7 yes Figure 5 Assembly diagram of the central jig and electrode assembly;

[0039] Figure 8 This is a flowchart illustrating the fabrication process of the electrode assembly in this invention;

[0040] Figure 9 yes Figure 8 A magnified view of a section at point M6;

[0041] Explanation of reference numerals in the instruction manual:

[0042] 10. Electrode assembly; 101. Electrode post; 102. Glass ring; 103. Sleeve; 1031. Cylinder body; 1032. Flanged flange; 1033. Annular filling cavity;

[0043] 50. Filling fixture; 501. Fixture; 5011. Positioning seat; 50111. Second clamping surface; 50112. First positioning groove; 50113. Second positioning groove; 5012. Cover plate; 50121. First clamping surface; 50122. First through hole; 501221. First receiving cavity; 501222. Second receiving cavity; 502. Filling head; 5021. Filling end; 50211. Clearance groove; 5022. Filling channel; 5023. Annular discharge port; 5024. Feed port; Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure or its application or use.

[0045] In the description of this invention, it should be understood that the terms "vertical," "upper," "lower," "top," "side," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Example 1

[0048] See Figures 5-7 This embodiment discloses a filling tool 50, which is used for the preparation of electrode assembly 10. Electrode assembly 10 includes a sleeve 103 and an electrode post 101. The electrode post 101 is located inside the sleeve 103. The sleeve 103 and the electrode post 101 are sealed together by a glass ring 102. The sleeve 103 includes a cylindrical body 1031. One end of the cylindrical body 1031 is formed with a flange 1032.

[0049] The aforementioned filling fixture 50 includes a jig 501 and a filling head 502;

[0050] The aforementioned fixture 501 includes a positioning seat 5011 and a cover plate 5012. The bottom end of the cover plate 5012 has a first clamping surface 50121, and the top end of the positioning seat 5011 forms a second clamping surface 50111. A first through hole 50122 is provided on the cover plate 5012.

[0051] The bottom end of the filling head 502 is the filling end 5021. The filling end 5021 is used to insert into the first through hole 50122 and align with the position to be filled of the workpiece in the first through hole 50122. The first through hole 50122 is used to accommodate the workpiece (electrode assembly 10) and the filling end 5021.

[0052] The filling head 502 has a filling channel 5022 inside, and the filling channel 5022 has an annular discharge port 5023; the annular discharge port 5023 is located inside the filling end 5021, such as Figure 6 As shown, the cross-sectional width K1 of the annular outlet 5023 decreases from top to bottom, exhibiting a tapering design that is wider at the top and narrower at the bottom. The interior of the filling channel 5022 is used to hold the glass raw material. After applying external pressure to the glass raw material inside the filling channel 5022, the glass raw material can flow out from the annular outlet 5023 and enter the filling cavity of the workpiece. The tapering design can cause the glass raw material to stop flowing and separate from the glass raw material in the external filling cavity after the external pressure is released, realizing convenient control of the filling operation and improving control accuracy and efficiency.

[0053] The filling tool 50 described above can effectively improve the glass filling efficiency, thereby improving the preparation efficiency and quality of the electrode assembly 10.

[0054] Furthermore, such as Figure 6 As shown, the longitudinal section of the annular outlet 5023 is an isosceles trapezoid, that is, both sides of the section are inclined. This double-inclination setting is more conducive to stopping the flow of glass raw materials after the external pressure is released.

[0055] Furthermore, such as Figure 6 As shown, when the longitudinal section of the annular discharge port 5023 is an isosceles trapezoid, this isosceles trapezoid is an axisymmetric figure, and its axis of symmetry is the first axis of symmetry. The angle λ between the leg of the isosceles trapezoid and the first axis of symmetry is not greater than 45°. Further, the angle λ between the leg of the isosceles trapezoid and the first axis of symmetry is not greater than 30°. In some embodiments, such as... Figure 7 As shown, the first through hole 50122 includes a first receiving cavity 501221 and a second receiving cavity 501222 arranged from top to bottom, and the first receiving cavity 501221 and the second receiving cavity 501222 are interconnected.

[0056] The first receiving cavity 501221 is used to receive the filling end 5021. The first receiving cavity 501221 is conical. The shape of the filling end 5021 is adapted to the shape of the first receiving cavity 501221, which is also conical. The conical setting makes it easier to center and position the filling end 5021 and the fixture 501, thereby ensuring that the annular discharge port 5023 and the annular filling cavity 1033 in the workpiece (electrode assembly) can be aligned vertically. It also makes it easier for the filling end 5021 to enter and exit the first receiving cavity 501221 more smoothly.

[0057] The second accommodating cavity 501222 is used to accommodate the electrode assembly 10 so that its annular filling cavity 1033 is exposed below the annular discharge port 5023.

[0058] In some embodiments, to avoid interference between the filling end 5021 and the electrode post 101 in the electrode assembly, the filling end 5021 is also provided with a relief groove 50211, and an annular discharge port 5023 surrounds the periphery of the relief groove 50211. Furthermore, the cross-section of the relief groove 50211 is an isosceles trapezoid, exhibiting a cross-sectional shape that is smaller at the top and larger at the bottom.

[0059] In some implementations, such as Figure 7 As shown, a first positioning groove 50112 is provided on the positioning seat 5011, and a second clamping surface 50111 is formed on the bottom surface of the first positioning groove 50112, so as to position the sleeve 103 in the electrode assembly 10 through the first positioning groove 50112, so that the flange 1032 of the sleeve 103 is positioned in the first positioning groove 50112, and the bottom end of the flange 1032 contacts the first clamping surface 50121;

[0060] Furthermore, the outer peripheral edge of the flange 1032 can be made to abut against the side wall of the first positioning groove 50112 to better ensure the positioning reliability of the flange 1032.

[0061] In some embodiments, a second positioning groove 50113 is provided inside the first positioning groove 50112 to position the pole post 101, such that the bottom end of the pole post 101 is placed in the second positioning groove 50113.

[0062] In some specific configurations, the first positioning groove 50112 and the second positioning groove 50113 correspond one-to-one. Multiple first positioning grooves 50112 can be provided on the positioning seat 5011 to simultaneously fix multiple sleeves 103 and electrode posts 101. At the same time, the filling head 502 can be provided with multiple annular discharge ports 5023, so that glass filling and sealing of multiple electrode assemblies can be completed in one process. For example, 10 to 50 sleeve structures can be fixed at the same time. Alternatively, multiple filling fixtures can be set at multiple stations, and each station is equipped with a corresponding electrode assembly, so that glass filling and sealing of multiple electrode assemblies can be completed in one process, thereby improving the preparation efficiency.

[0063] In some implementations, such as Figure 5 As shown, the top of the filling head 502 is provided with a feed port 5024, and the filling channel 5022 is connected to the feed port 5024 so that glass raw materials can be injected through the feed port 5024 and the filling channel 5022.

[0064] The filling tool 50 described above can effectively improve the glass filling efficiency, thereby improving the preparation efficiency and quality of the electrode assembly 10.

[0065] Example 2

[0066] This embodiment discloses a method for preparing an electrode assembly 10, which can be achieved using the filling tool 50 described in Embodiment 1.

[0067] like Figures 8-9 As shown, the above preparation method includes the following steps:

[0068] Step 1: Provide pole post 101 and sleeve 103. Sleeve 103 includes cylinder 1031, and one end of cylinder 1031 is formed with flange 1032.

[0069] Step 2, as follows Figure 8 In the intermediate AC stage, the pole post 101 and the sleeve 103 are positioned using the jig 501, so that the flange 1032 is clamped between the first clamping surface 50121 and the second clamping surface 50111, and the cylinder 1031 is located in the first through hole 50122; and the pole post 101 is located inside the sleeve 103, and an annular filling cavity 1033 is formed between the pole post 101 and the sleeve 103.

[0070] Step 3, as follows Figure 8 In the middle d stage, the filling head 502 is moved so that it is inserted into the first through hole 50122 and the annular discharge port 5023 is positioned above the annular filling cavity 1033 to facilitate subsequent filling.

[0071] Step 4, as follows Figure 9 as well as Figure 8 In the middle d stage, glass raw material aa is injected into the filling channel 5022 inside the filling head 502, so that the glass raw material aa is filled into the annular filling cavity 1033 through the annular outlet 5023.

[0072] Step 5: After the annotation is completed, as follows Figure 8 In the middle stage, the filling head 502 is removed, and the fixture 501 (which has an pole 101, a sleeve 103, and glass raw material in an annular filling cavity 1033) is placed in a heating furnace for heating. The glass raw material melts, sealing the sleeve 103 and the pole 101 together. The glass raw material between the sealed sleeve 103 and the pole 101 forms a glass ring 102. At this point, the sleeve 103, the pole 101, and the glass ring 102 are connected as a whole, forming a structure as shown in the image. Figure 8 Electrode assembly 10 is shown in stage f.

[0073] After step 5, simply remove the electrode assembly 10 from the fixture 501 and take it out of the heating furnace.

[0074] In some embodiments, the glass raw material is a mixture of lead-free glass material and organic binder to enhance its filling flowability and molding stability.

[0075] Furthermore, the aforementioned lead-free glass material can be low-melting-point lead-free glass to improve environmental friendliness and airtightness.

[0076] The aforementioned sleeve 103 can be made of stainless steel, specifically 316L stainless steel.

[0077] In some embodiments, when the fixture 501 is placed in a heating furnace and heated to melt the glass raw material and seal the sleeve 103 and the pole post 101 together, a temperature-controlled heating treatment is used so that the glass can melt uniformly and form a dense bond with the surface of the pole post 101 / sleeve 103.

[0078] The above-mentioned temperature-controlled heating treatment method includes: controlling the heating rate to 2-5 °C / min, heating to the melting temperature, and maintaining the constant temperature for 10-30 minutes to reduce the thermal stress difference between the glass and the sleeve 103. In particular, when the sleeve 103 is made of 316L stainless steel, the thermal stress difference between the glass and 316L stainless steel can be reduced better, so that the glass and the sleeve 103 can be fully bonded, ensuring the stability and reliability of the bond.

[0079] Understandably, the above melting temperature is the temperature at which the glass raw material melts to seal the sleeve 103 and the pole 101 together.

[0080] Furthermore, the melting temperature is 380–520°C, for example, 400°C, 430°C, 450°C, 480°C, etc. The overall melting temperature is relatively low, which reduces the impact on the metal electrode 101 and sleeve 103 themselves while ensuring the glass melts. Furthermore, the glass material is low-melting-point lead-free glass.

[0081] In some embodiments, the heating furnace is a vacuum furnace, or the heating furnace contains a protective gas, such that the heating process is carried out in a protective atmosphere of the protective gas.

[0082] In some embodiments, after the glass raw material is melted to seal the sleeve 103 and the pole 101 together, a cooling and solidification process is also performed.

[0083] During the cooling and solidification process: first, the temperature is lowered to below the melting point of the glass raw material at a rate of 1 to 3 °C / min, and then naturally cooled to room temperature until the glass raw material is completely solidified, thereby forming a stable hermetically sealed structure.

[0084] For example, during the cooling and curing process: the temperature is first reduced to 300 °C at a rate of 2 °C / min, and then allowed to cool naturally to room temperature.

[0085] In some implementations, such as Figure 4As shown, the thickness of the flange 1032 is 50-250 μm, and the width L1 of the flange 1032 is 0.3-1 mm, which is more conducive to the fixing of the sleeve, and also more conducive to the filling of glass raw materials and the reduction of thermal stress concentration.

[0086] The “width of the flange” can be understood as the distance between the outer edge of the flange 1032 and the outer wall of the cylinder 103.

[0087] The wall thickness of the cylinder 1031 in sleeve 103 and the thickness of the flange 1032 are the same, both ranging from 50 to 250 μm.

[0088] The design of the flange 1032 described above can enhance the bonding strength between the glass and the sleeve 103 and reduce stress concentration.

[0089] In some solutions, the positioning seat 5011 is provided with a first positioning groove 50112, and a second clamping surface 50111 is formed on the bottom surface of the first positioning groove 50112. The first positioning groove 50112 is provided with a second positioning groove 50113. When positioning the pole post 101 and the sleeve 103 using the fixture 501, the pole post 101 is placed in the second positioning groove 50113, and the flange 1032 is placed in the first positioning groove, so that the flange 1032 is clamped between the first clamping surface 50121 and the second clamping surface 50111, thereby realizing the positioning of the sleeve 103.

[0090] In some schemes, such as Figure 5 As shown, after the glass raw material is injected into the filling channel 5022 in the filling head 502, external pressure is used to pressurize the injected glass raw material, so that the glass raw material is filled into the annular filling cavity 1033 through the annular outlet 5023, so as to improve the compactness and reliability of the filling through external pressure.

[0091] Furthermore, when applying external pressure to the injected glass raw material, either positive pressure injection or negative pressure injection with vacuum can be used.

[0092] For example, the following methods can be used in the specific preparation process:

[0093] The pole post 101 and the sleeve 103 are fixed in the fixture 501, and an annular filling cavity 1033 is formed between the pole post 101 and the sleeve 103.

[0094] Move the filling head 502 so that it is inserted into the first through hole 50122 on the cover plate 5012, so that the annular discharge port 5023 is located above the annular filling cavity 1033.

[0095] This allows the glass material in the filling head 502 to be injected into the annular filling cavity 1033 through the annular outlet 5023;

[0096] After the filling is completed, the fixture 501 after removing the filling head 502 is moved to the heating furnace for heating. The heating rate is controlled at 3℃ / min. After reaching 450℃, the temperature is kept constant for 20 minutes to melt the glass raw material and seal the pole 101 and sleeve 103 together.

[0097] Then, a cooling and curing process is carried out. First, the temperature is reduced to 300 ℃ at a rate of 2℃ / min, and then it is allowed to cool naturally to room temperature.

[0098] After cooling, the glass material between the pole post 101 and the sleeve 103 solidifies to form a stable glass ring 102, and the glass ring 102 achieves an airtight connection between the pole post 101 and the sleeve 103.

[0099] The above-mentioned preparation process is stable and highly operable. The prepared electrode components have high sealing consistency, reducing manual assembly errors. It is suitable for automated large-scale production, especially for the batch sealing production of metal casings for lithium-ion batteries. It is more conducive to increasing production capacity, reducing production costs, and meeting the hermeticity requirements of miniaturized electronic products.

[0100] Example 3

[0101] like Figures 1-4 As shown, this embodiment discloses an electrode assembly 10, which can be prepared using the method described in Embodiment 2.

[0102] The electrode assembly 10 mentioned above includes a sleeve 103, an electrode post 101, and a glass ring 102;

[0103] The sleeve 103 includes a cylinder 1031, and a flange 1032 is formed at one end of the cylinder 1031;

[0104] The pole post 101 is located inside the sleeve 103;

[0105] The sleeve 103 and the pole post 101 are heat-sealed together by a glass ring 102.

[0106] In the aforementioned electrode assembly 10, the sleeve 103 and the inner electrode post 101 are sealed together by a glass ring 102, which can effectively ensure the insulation and airtightness between the sleeve 103 and the electrode post 101. During the preparation, glass material can be filled inside the sleeve 103 and the electrode post 101 and melted at high temperature, thereby connecting the sleeve 103 and the electrode post 101 together by hot-melt glass.

[0107] Furthermore, the cylinder 1031 and the flange 1032 in the sleeve 103 are integrally formed structures, which can be prepared by deep drawing and stamping process without welding or splicing, which is more conducive to improving structural strength and consistency.

[0108] In some implementations, such as Figure 4 As shown, the thickness of the flange 1032 is 50-250 μm, and the width L1 of the flange 1032 is 0.3-1 mm, which is more conducive to the fixing of the sleeve, and also more conducive to the filling of glass raw materials and the reduction of thermal stress concentration.

[0109] The “width of the flange” can be understood as the distance between the outer edge of the flange 1032 and the outer wall of the cylinder 103.

[0110] The wall thickness of the sleeve 103 body 103 and the thickness of the flange 1032 are the same, both ranging from 50 to 250 μm. For example, they can be 60, 80, 100, 150, 200 μm, etc., making them thin-walled parts.

[0111] Furthermore, such as Figure 4 As shown, the outer diameter D1 of the flange 1032 is 2-3 mm, for example, it can be 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, etc.

[0112] In some designs, the outer diameter D2 of the cylinder 1031 is 1.35 to 2.25 mm. For example, the outer diameter of the cylinder 1031 can be 1.5 mm, 2 mm, etc.

[0113] In some embodiments, the height H1 of the glass ring 102 is no greater than 0.5 mm; for example, the height H1 of the glass ring 102 can be 0.475 mm. This is suitable for ultra-thin battery designs. Furthermore, the height of the sleeve 103 is the same as the height of the glass ring 102, and the top surface of the glass ring 102 is flush with the top surface of the sleeve 103, and the bottom surface of the glass ring 102 is flush with the bottom surface of the sleeve 103, to better ensure the integrity of the seal.

[0114] The inner diameter of the glass ring 102 can be 0.5 to 1.5 mm; the outer diameter of the glass ring 102 can be 1.2 to 2.1 mm.

[0115] It is understandable that the "inner diameter of the glass ring" mentioned above refers to the inner diameter at any point between the two end faces of the glass ring (including the end faces), and similarly, the "outer diameter of the glass ring" mentioned above refers to the outer diameter at any point between the two end faces of the glass ring (including the end faces).

[0116] In some implementations, the height H2 of the pole post 101 is not greater than 0.8 mm, for example, it can be 0.725 mm.

[0117] In some embodiments, the pole post 101 is cylindrical or nearly cylindrical. For example, the middle part of the pole post 101 is slightly smaller than the two ends. Specifically, the outer diameter of the top and bottom surfaces of the pole post 101 is slightly larger than the outer diameter of the middle part.

[0118] In some embodiments, to improve the bonding strength between the glass ring 102 and the electrode post 101, the electrode post 101 and the glass ring 102 are bonded together by a sequentially disposed oxide film layer and a metal transition layer. The oxide film layer is grown on the surface of the electrode post 101, and the metal transition layer is deposited on the surface of the oxide film layer. The metal transition layer is located between the oxide film layer and the glass ring 102. This structure significantly improves the bonding strength and interfacial stability between the metal electrode post 101 and the glass ring 102, thereby enhancing the structure's airtightness, thermal cycling stability, and reliability.

[0119] In some specific designs, the oxide film can be an oxide layer of nickel or an oxide layer; the thickness of the oxide film can be 10–200 nm, specifically 50 nm, 100 nm, 150 nm, etc.

[0120] In some specific designs, the metal transition layer is one or more combinations of chromium (Cr) layer, titanium (Ti) layer, molybdenum (Mo) layer, nickel (Ni) layer or nickel-phosphorus alloy (Ni-P alloy) layer; the thickness of the metal transition layer is 50 to 500 nm, specifically 50 nm, 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 400 nm, etc.

[0121] In some embodiments, a roughening layer is also formed on the surface of the electrode post 101. The roughening layer includes multiple pits to form an uneven surface. An oxide film layer and a metal transition layer are sequentially coated on the outside of the roughening layer to improve the bonding strength.

[0122] In some embodiments, the sleeve 103 may be made of stainless steel, such as 316L stainless steel, the pole 101 may be a metal pole 101, and the pole 101 may be made of nickel, aluminum or copper, and the glass ring 102 may be made of silicate glass.

[0123] In some embodiments, the pole piece 101 is made of one or more of aluminum, nickel, nickel-based alloys, or Kova alloys (alloy materials with iron, nickel, and cobalt as the main components), and the sleeve 103 is made of stainless steel, for example, the sleeve 103 can be made of 316L stainless steel.

[0124] Both the glass ring and 316L stainless steel can withstand high temperatures, effectively preventing failure caused by high temperatures.

[0125] The electrode assembly described above has high airtightness, heat resistance and long-term reliability, and is particularly suitable for use in electrode assemblies in lithium-ion battery casings.

[0126] This embodiment also discloses a battery casing assembly, which includes a casing and an electrode assembly 10. The electrode assembly 10 is welded to the casing, and the casing is provided with mounting holes. A cylindrical body 1031 is inserted into the mounting holes, and a flanged flange 1032 is welded to the casing. An annular weld mark is formed at the connection between the flanged flange 1032 and the casing.

[0127] The aforementioned electrode assembly can be used in mobile phone batteries, wearable device batteries, and other micro-packaged batteries, exhibiting high versatility in applications.

[0128] All the above-mentioned optional technical solutions can be combined in any way to form optional embodiments of the present invention. That is, any number of embodiments can be combined to meet the needs of different application scenarios. All of these are within the protection scope of this application and will not be described in detail here.

[0129] It should be noted that the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A filling tool, characterized in that: include, The fixture includes a positioning seat and a cover plate. The bottom end of the cover plate has a first clamping surface, and the top end of the positioning seat forms a second clamping surface. A first through hole is provided on the cover plate. The filling head has a filling end at its bottom, which is used to insert into the first through hole. The filling head has a filling channel inside, and the filling channel has an annular discharge port located inside the filling end. The cross-sectional width of the annular discharge port decreases from top to bottom.

2. The filling tooling according to claim 1, characterized in that: The cross-section of the annular discharge port is an isosceles trapezoid.

3. The filling tooling according to claim 1, characterized in that: The first through hole includes a first receiving cavity and a second receiving cavity arranged from top to bottom. The first receiving cavity is used to receive the filling end. The first receiving cavity is conical. The shape of the filling end is adapted to the shape of the first receiving cavity. The second receiving cavity is used to receive the electrode assembly.

4. The filling tooling according to claim 1, characterized in that: The filling end is also provided with a clearance groove, and the annular discharge port surrounds the periphery of the clearance groove.

5. The filling tooling according to claim 1, characterized in that: The positioning seat is provided with a first positioning groove, and a second clamping surface is formed on the bottom surface of the first positioning groove.

6. The filling tooling according to claim 5, characterized in that: The first positioning groove has a second positioning groove inside it.

7. A method for fabricating electrode assemblies using the filling tooling as described in any one of claims 1-6, characterized in that: include, A pole and a sleeve are provided, the sleeve comprising a cylindrical body having a flanged flange at one end; The fixture is used to position the pole and the sleeve, such that the flange is clamped between the first clamping surface and the second clamping surface, and the cylinder is located in the first through hole; and the pole is located inside the sleeve, forming an annular filling cavity between the pole and the sleeve. Move the filling head so that it is inserted into the first through hole and the annular outlet is positioned above the annular filling cavity; Glass raw material is injected into the filling channel inside the filling head, so that the glass raw material is filled into the annular filling cavity through the annular outlet; After the filling is completed, the filling head is removed, and the fixture is placed in a heating furnace for heating, so that the glass raw material is melted and the sleeve and the pole are sealed together. The glass raw material between the sealed sleeve and the pole forms a glass ring.

8. The method according to claim 7, characterized in that: The glass raw material is a mixture of lead-free glass material and organic binder.

9. The method according to claim 7, characterized in that: When the fixture is placed in a heating furnace and heated to melt the glass raw material and seal the sleeve and electrode together, a temperature-controlled heating treatment is used. The temperature-controlled heating treatment includes controlling the heating rate to 2-5 °C / min, heating to the melting temperature, and maintaining the melting temperature for 10-30 minutes. At the melting temperature, the glass raw material melts and seals the sleeve and electrode together.

10. The method according to claim 9, characterized in that: The melting temperature is 380–520°C.

11. The method according to claim 7, characterized in that: After the glass raw material is melted to seal the sleeve and the pole together, a cooling and solidification process is carried out. During the cooling and solidification process, the temperature is first lowered to below the melting point of the glass raw material at a rate of 1 to 3 °C / min, and then naturally cooled to room temperature until the glass raw material is completely solidified.

12. The method according to claim 7, characterized in that: The thickness of the flange is 50-250 μm, and the width of the flange edge is 0.3-1 mm.

13. The method according to claim 7, characterized in that: The positioning seat is provided with a first positioning groove, and a second clamping surface is formed on the bottom surface of the first positioning groove. The first positioning groove is provided with a second positioning groove inside. When the fixture is used to position the pole post and the sleeve, the pole post is placed in the second positioning groove and the flange is placed in the first positioning groove, so that the flange is clamped between the first clamping surface and the second clamping surface.

14. The method according to claim 7, characterized in that: After the glass material is injected into the filling channel inside the filling head, external pressure is applied to the injected glass material so that the glass material is filled into the annular filling cavity through the annular outlet.

15. An electrode assembly, characterized in that: The electrode assembly is prepared by the method according to any one of claims 7-14, and comprises, A sleeve, the sleeve comprising a cylindrical body, one end of which is formed with a flange; A pole post, which is located inside the sleeve; A glass ring is used to seal the sleeve and the pole.

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