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CN-122000650-A - Electrode assembly, filling tool and preparation method

CN122000650ACN 122000650 ACN122000650 ACN 122000650ACN-122000650-A

Abstract

The invention relates to an electrode assembly, a filling tool and a preparation method, wherein the filling tool comprises a tool, the tool comprises a positioning seat and a cover plate, the bottom end of the cover plate is provided with a first clamping surface, the top end of the positioning seat forms a second clamping surface, the cover plate is provided with a first through hole, the bottom end of a filling head is a filling end, the filling end is used for being inserted into the first through hole, a filling channel is arranged in the filling head, the filling channel is provided with an annular discharge hole, the annular discharge hole is positioned in the filling end, and the section width of the annular discharge hole is gradually reduced from top to bottom. The invention also discloses an electrode assembly and a preparation method thereof. The invention can effectively improve the preparation efficiency and the preparation quality of the electrode assembly.

Inventors

  • ZHONG DINGHUA
  • CHEN JINPENG
  • Han Shihan
  • FU JINGQIN
  • CHEN HAIFENG

Assignees

  • 苏州中科瑞龙科技有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (15)

  1. 1. A filling tool is characterized by comprising, The jig comprises a positioning seat and a cover plate, wherein the bottom end of the cover plate is provided with a first clamping surface, and the top end of the positioning seat is provided with a second clamping surface; The filling head is provided with a filling end, the filling end is used for being inserted into the first through hole, a filling channel is arranged inside the filling head, the filling channel is provided with an annular discharging hole, the annular discharging hole is positioned inside the filling end, and the section width of the annular discharging hole is gradually decreased from top to bottom.
  2. 2. The filling tool of claim 1, wherein the cross section of the annular discharge hole is isosceles trapezoid.
  3. 3. The filling tool of claim 1, wherein the first through hole comprises a first accommodating cavity and a second accommodating cavity which are arranged from top to bottom, the first accommodating cavity is used for accommodating the filling end, the first accommodating cavity is conical, the filling end is matched with the shape of the first accommodating cavity, and the second accommodating cavity is used for accommodating the electrode assembly.
  4. 4. The filling tool of claim 1, wherein the filling end is further provided with an avoidance groove, and the annular discharge port surrounds the periphery of the avoidance groove.
  5. 5. The filling tool of claim 1, wherein the positioning seat is provided with a first positioning groove, and the bottom surface of the first positioning groove is provided with the second clamping surface.
  6. 6. The filling tool of claim 5, wherein the first positioning groove is internally provided with a second positioning groove.
  7. 7. A method for preparing an electrode assembly by using the filling tool according to any one of claims 1 to 6, which comprises the steps of, Providing a pole and a sleeve, wherein the sleeve comprises a cylinder, and a flanging flange is formed at one end of the cylinder; Positioning the polar post and the sleeve by using the jig, so that the flanging flange is clamped between the first clamping surface and the second clamping surface, the cylinder body is positioned in the first through hole, the polar post is positioned in the sleeve, and an annular filling cavity is formed between the polar post and the sleeve; Moving a filling head, enabling the filling head to be inserted into the first through hole, and enabling the annular discharge hole to be located above the annular filling cavity; injecting glass raw materials into an injection channel in the injection head, so that the glass raw materials are injected into the annular filling cavity through the annular discharge port; After filling, the filling head is removed, the jig is placed into a heating furnace for heating, so that the glass raw materials are melted to seal the sleeve and the pole together, and the glass raw materials between the sealed sleeve and the pole form a glass ring.
  8. 8. The method of claim 7, wherein the glass raw material is a mixture of a lead-free glass material and an organic binder.
  9. 9. The method of claim 7, wherein the jig is placed in a heating furnace to be heated, and a temperature-controlled heating treatment mode is adopted when the glass raw material is melted and the sleeve and the pole are sealed together, and the temperature-controlled heating treatment mode comprises the steps of controlling the heating rate to be 2-5 ℃ per minute, and maintaining the melting temperature for 10-30 minutes after the temperature is raised to the melting temperature, and the glass raw material is melted and the sleeve and the pole are sealed together at the melting temperature.
  10. 10. The method of claim 9, wherein the melting temperature is 380-520 ℃.
  11. 11. The method of claim 7, wherein the sleeve and the post are sealed together by melting the glass raw material, and then cooling and solidifying the sleeve and the post, wherein the cooling and solidifying process is performed by reducing the temperature to below the melting point of the glass raw material at a rate of 1-3 ℃ per minute, and naturally cooling the sleeve and the post to room temperature until the glass raw material is completely solidified.
  12. 12. The method of claim 7, wherein the flange has a thickness of 50-250 μm and a rim width of 0.3-1 mm.
  13. 13. The method of claim 7, wherein the positioning base is provided with a first positioning groove, the bottom surface of the first positioning groove is provided with the second clamping surface, a second positioning groove is formed in the first positioning groove, the pole is placed in the second positioning groove when the jig is used for positioning the pole and the sleeve, and the flanging flange is placed in the first positioning groove, so that the flanging flange is clamped between the first clamping surface and the second clamping surface.
  14. 14. The method according to claim 7, wherein after the glass raw material is injected into the filling channel in the filling head, the injected glass raw material is pressurized by an external pressure so that the glass raw material is filled into the annular filling cavity through the annular discharge port.
  15. 15. An electrode assembly prepared by the method of any one of claims 7-14, comprising, The sleeve comprises a cylinder body, and a flanging flange is formed at one end of the cylinder body; a pole located inside the sleeve; And the glass ring is used for sealing the sleeve and the pole through the glass ring.

Description

Electrode assembly, filling tool and preparation method Technical Field The invention relates to the technical field of batteries, in particular to an electrode assembly, a filling tool and a preparation method. Background The electrode assembly in the battery is disposed on the case to electrically connect the internal electric core of the case with external electric components through the electrode assembly. The electrode assembly generally comprises a pole, an insulating part is required to be arranged between the pole and a shell to ensure insulating sealing, a plastic piece is generally adopted as the insulating part, but the plastic piece is low in temperature resistance and poor in corrosion resistance, is easy to fail under thermal disturbance, humidity or long-term mechanical stress to influence the sealing insulating performance of the battery shell, and is difficult to meet the requirements of safety requirements and long-term use safety of the battery under high-power charging and discharging conditions. Disclosure of Invention Therefore, the invention aims to solve the technical problem of improving the preparation efficiency and the preparation quality of the electrode assembly in the prior art. In order to solve the technical problems, the invention provides a filling tool, which comprises, The jig comprises a positioning seat and a cover plate, wherein the bottom end of the cover plate is provided with a first clamping surface, and the top end of the positioning seat is provided with a second clamping surface; The filling head is provided with a filling end, the filling end is used for being inserted into the first through hole, a filling channel is arranged inside the filling head, the filling channel is provided with an annular discharging hole, the annular discharging hole is positioned inside the filling end, and the section width of the annular discharging hole is gradually decreased from top to bottom. In one embodiment of the invention, the cross section of the annular discharge opening is isosceles trapezoid. In one embodiment of the present invention, the first through hole includes a first accommodating cavity and a second accommodating cavity from top to bottom, the first accommodating cavity is used for accommodating the filling end, the first accommodating cavity is tapered, the filling end is adapted to the shape of the first accommodating cavity, and the second accommodating cavity is used for accommodating the electrode assembly. In one embodiment of the invention, the filling end is further provided with an avoidance groove, and the annular discharge hole surrounds the periphery of the avoidance groove. In one embodiment of the present invention, the positioning seat is provided with a first positioning groove, and the bottom surface of the first positioning groove is provided with the second clamping surface. In one embodiment of the present invention, the first positioning groove is internally provided with a second positioning groove. The invention also discloses a method for preparing the electrode assembly by using the filling tool of any one of the above steps, Providing a pole and a sleeve, wherein the sleeve comprises a cylinder, and a flanging flange is formed at one end of the cylinder; Positioning the polar post and the sleeve by using the jig, so that the flanging flange is clamped between the first clamping surface and the second clamping surface, the cylinder body is positioned in the first through hole, the polar post is positioned in the sleeve, and an annular filling cavity is formed between the polar post and the sleeve; Moving a filling head, enabling the filling head to be inserted into the first through hole, and enabling the annular discharge hole to be located above the annular filling cavity; injecting glass raw materials into an injection channel in the injection head, so that the glass raw materials are injected into the annular filling cavity through the annular discharge port; After filling, the filling head is removed, the jig is placed into a heating furnace for heating, so that the glass raw materials are melted to seal the sleeve and the pole together, and the glass raw materials between the sealed sleeve and the pole form a glass ring. In one embodiment of the invention, the glass raw material is a mixture of a lead-free glass material and an organic binder. In one embodiment of the invention, the jig is placed into a heating furnace to be heated, so that the glass raw material is melted and the sleeve and the pole are sealed together by adopting a temperature control heating treatment mode, wherein the temperature control heating treatment mode comprises the steps of controlling the temperature rising rate to be 2-5 ℃ per minute, keeping the melting temperature for 10-30 minutes after rising to the melting temperature, and sealing the sleeve and the pole together by melting the glass raw material at the melting temperature. In one embodiment