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EP-4443579-B1 - WINDING NEEDLE ASSEMBLY AND WINDING DEVICE

EP4443579B1EP 4443579 B1EP4443579 B1EP 4443579B1EP-4443579-B1

Inventors

  • YANG, GUOZHONG
  • LI, XIAOBIN
  • ZHANG, Yaji
  • GAO, YING
  • ZHUANG, Zijing
  • SONG, Ning
  • SUN, Xiangli
  • LI, Fengdan
  • WU, XIAOPING

Dates

Publication Date
20260506
Application Date
20220727

Claims (15)

  1. A winding needle assembly (30) for winding electrode plates (42a; 42b) and a separator (42c), comprising a first winding needle (31); and a second winding needle (32), wherein the first winding needle (31) and the second winding needle (32) are configured to clamp the separator (42c), characterised in that the second winding needle (32) is provided with a rolling member (40) on a side of the second winding needle (32) toward the first winding needle (31).
  2. The winding needle assembly (30) according to claim 1, wherein the first winding needle (31) comprises a first connecting part (311) and a first winding part (312) that are connected to each other; the second winding needle (32) comprises a second connecting part (321) and a second winding part (322) that are connected to each other, the second connecting part (322) and the first connecting part (311) are fixed to each other, the first winding part (312) and the second winding part (322) are configured to clamp the separator (42c), and the rolling member (40) is disposed on a side of the second winding part (322) toward the first winding part (312).
  3. The winding needle assembly (30) according to claim 2, wherein the rolling member (40) is arranged at an end of the second winding part (322) away from the second connecting part (321).
  4. The winding needle assembly (30) according to claim 2, wherein a first inclined surface (313) is arranged at an end of the first winding part (312) away from the first connecting part (311); a second inclined surface (323) is arranged at an end of the second winding part (322) away from the first winding part (312), and the first inclined surface (313) is opposite to the second inclined surface (323).
  5. The winding needle assembly (30) according to claim 2, wherein the first connecting part (311) protrudes in a direction away from the second winding needle (32) relative to the first winding part (312); and/or, the second connecting part (321) protrudes in a direction away from the first winding needle (31) relative to the second winding part (322).
  6. The winding needle assembly (30) according to claim 1, wherein a side of the second winding needle (32) toward the first winding needle (31) and a side of the first winding needle (31) toward the second winding needle (32) are both planar.
  7. The winding needle assembly (30) according to claim 6, wherein at least a portion of the rolling member (40) protrudes from the side of the second winding needle (32) toward the first winding needle (31).
  8. The winding needle assembly (30) according to claim 7, wherein the rolling member (40) protrudes for 0.5-5mm from the side of the second winding needle (32) toward the first winding needle (31).
  9. The winding needle assembly (30) according to claim 7, wherein a first groove (314) is provided on the side of the first winding needle (31) toward the second winding needle (32), and the first groove (314) is configured to avoid the rolling member (40).
  10. The winding needle assembly (30) according to claim 9, wherein a second groove (324) is provided on the side of the second winding needle (32) toward the first winding needle (31), the rolling member (40) is accommodated in the second groove (324), and the second groove (324) is opposite to the first groove (314).
  11. The winding needle assembly (30) according to claim 10, wherein a third groove (325) is provided by recessing a bottom wall of the second groove (324) toward a side away from the first winding needle (31), and the at least a portion of the rolling member (40) is accommodated in the third groove (325).
  12. The winding needle assembly (30) according to claim 1, wherein the rolling member (40) comprises: a fixed shaft (41) with two ends each fixed to the second winding needle (32); and a rolling body (42) rotatably connected to the fixed shaft (41).
  13. The winding needle assembly (30) according to claim 1, wherein the first winding needle (31) is provided with at least one first fixing hole (315); the second winding needle (32) is provided with at least one second fixing hole (326), the second fixing hole (326) is disposed corresponding to the first fixing hole (315).
  14. The winding needle assembly (30) according to claim 1, wherein the first winding needle (31) is provided with a first positioning part (316) configured to be fixed with an external mechanism; and/or; the second winding needle (32) is provided with a second positioning part (327) configured to be fixed with an external mechanism.
  15. A winding device, comprising: the winding needle assembly (30) according to any one of claims 1-14; and a driving mechanism configured to drive the winding needle assembly (30) to rotate.

Description

TECHNICAL FIELD The present application relates to the field of battery processing technology, and more specifically, relates to a winding needle assembly and a winding device. A winding needle assembly according to the preamble of claim 1 is known from CN 112 259 805 A. BACKGROUND Currently, based on the development of the market situation, the application of the power battery is becoming increasingly widespread. Power battery is not only used in energy storage power systems such as hydropower, firepower, wind power, and solar power plants, but also widely used in electric vehicle such as electric bicycle, electric motorcycle, and electric automobile, as well as in various fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, its market demand is also constantly expanding. In the development of battery technology, how to improve the production efficiency of a battery is an important research direction. SUMMARY The present application provides a winding needle assembly and a winding device that can improve the production efficiency of the battery. In the first aspect, the embodiments of the present application provide a winding needle assembly for winding electrode plates and a separator. The winding needle assembly includes a first winding needle and a second winding needle, the first winding needle and the second winding needle are configured to clamp the separator, and the second winding needle is provided with a rolling member on a side of the second winding needle toward the first winding needle. In the above solution, when the electrode assembly of the battery cell is prepared, the first winding needle is placed on a side of the separator, and then the second winding needle is moved along the first winding needle toward the direction of the separator until the second winding needle and the first winding needle clamp the separator. Then, the winding needle assembly is driven to rotate, and the electrode plates are inserted into the separator to rotate with the winding needle assembly until a certain thickness of electrode assembly is obtained by winding. Then the second winding needle is moved along the first winding needle and pulled out, and finally the first separator is pulled out. Due to the presence of the rolling member arranged on the side of the second winding needle toward the first winding needle, there is rolling friction between the rolling member and the first winding needle, reducing the friction between the first winding needle and the second winding needle, which avoids scratching the separator when the winding needle assembly is inserted into the separator or pulled out of the separator, or avoids misplacing and bringing out part of the separator when the second winding needle is pulled out, which otherwise would reduce the production efficiency of the battery. In some embodiments, the first winding needle includes a first connecting part and a first winding part that are connected to each other. The second winding needle includes a second connecting part and a second winding part that are connected to each other, the second connecting part and the first connecting part are fixed to each other, the first winding part and the second winding part are configured to clamp the separator, and the rolling member is arranged on a side of the second winding part toward the first winding part. In the above solution, the first winding part and the second winding part are close to each other and assembled for winding the separator and the electrode plates. The first connecting part and the second connecting part are fixed to each other, improving the stability of the needle winding assembly and ensuring that the needle winding assembly can maintain stability during the winding process. In some embodiments, the rolling member is arranged at an end of the second winding part away from the second connecting part. In the above solution, as the rolling member is arranged in the front of the second winding part, during the insertion of the second winding needle into the separator, it can ensure that the first and second winding needles always come into contact through the rolling member, further improving the protective effect of the winding needle assembly for the separator. In some embodiments, a first inclined surface is provided at an end of the first winding part away from the first connecting part; a second inclined surface is arranged at an end of the second winding part away from the first winding part, and the first inclined surface is opposite to the second inclined surface. In the above solution, the first inclined surface and the second inclined surface are configured for positioning an external mechanism. The first inclined surface and the second inclined surface have a guiding function, and the external mechanism can be inserted between the first inclined surface and the second inclined surface to support the first an