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CN-224232746-U - Cylindrical battery

CN224232746UCN 224232746 UCN224232746 UCN 224232746UCN-224232746-U

Abstract

The application discloses a cylindrical battery, which comprises a shell and a winding core, wherein the winding core is positioned in the shell and is provided with a winding core hole, the cylindrical battery also comprises a pressure relief structure and a current collecting disc, the pressure relief structure and the current collecting disc are respectively arranged at two ends of the shell in the axial direction, the current collecting disc is electrically connected with a tab led out from the winding core, the current collecting disc comprises a protruding part which is used for being electrically connected with a pole column assembly of the cylindrical battery, the protruding part is provided with a cavity, the cavity is communicated with the winding core hole, the distance between the surface of the protruding part facing the winding core and the end surface of a negative pole piece facing the current collecting disc is h, the unit is mm, the radial dimension of the winding core hole is D, and the unit is mm, and h/D=0.2-1.8. Through the reasonable design of the exhaust channel, the gas accumulated on the side where the current collecting disc is located during thermal runaway can be smoothly discharged to the side where the pressure release structure is located, and the integrity of the posture of the cylindrical battery is guaranteed.

Inventors

  • XU PENGFEI
  • HE MINGHUA
  • HUANG JIAXIN
  • FENG JINGJING

Assignees

  • 中创新航技术研究院(江苏)有限公司
  • 中创新航科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20250421

Claims (11)

  1. 1. The cylindrical battery comprises a shell and a winding core, wherein the winding core is positioned in the shell and is provided with a winding core hole, the cylindrical battery further comprises a pressure relief structure and a current collecting disc, the pressure relief structure and the current collecting disc are respectively arranged at two ends of the shell in the axial direction, the current collecting disc is electrically connected with a tab led out from the winding core, the current collecting disc comprises a protruding portion, the protruding portion is used for being electrically connected with a pole column assembly of the cylindrical battery, the protruding portion is provided with a cavity, the cavity is communicated with the winding core hole, the distance between the surface of the protruding portion facing the winding core and the end face of the negative electrode piece of the winding core facing the current collecting disc is h, the unit is mm, the radial size of the winding core hole is D, the unit is mm, and h/D=0.2-1.8.
  2. 2. The cylindrical battery according to claim 1, wherein the dimension of the protruding portion in the axial direction of the cylindrical battery is 1mm to 6mm.
  3. 3. The cylindrical battery according to claim 1, wherein the tab comprises a plurality of layers of tab pieces distributed along the radial direction, and the maximum thickness of the tab pieces is 0.2 mm-2 mm in the axial direction of the cylindrical battery.
  4. 4. The cylindrical battery according to claim 1, wherein the tab comprises a plurality of tab sheets distributed along the radial direction, the winding core comprises a plurality of pole piece winding layers, at least part of the pole piece winding layers are led out of the tab sheets, and the leading-out length of the tab sheets is 2 mm-12 mm.
  5. 5. The cylindrical battery of claim 1, wherein the separator of the winding core is 0.5-2 mm beyond the negative electrode sheet at an end of the winding core facing the current collecting plate.
  6. 6. The cylindrical battery according to any one of claims 1 to 5, wherein the protruding portion includes a flat plate portion and a peripheral wall portion located at an outer periphery of the flat plate portion, the flat plate portion and the peripheral wall portion being enclosed to form the chamber, the peripheral wall portion being provided with at least one through hole.
  7. 7. The cylindrical battery according to claim 6, wherein the peripheral wall portion is provided with a plurality of the through holes, the plurality of through holes being uniformly distributed along a circumferential direction of the peripheral wall portion.
  8. 8. The cylindrical battery according to claim 6, wherein a ratio of a sum of areas of the through holes to a surface area of the peripheral wall portion is 0.01 to 0.6.
  9. 9. The cylindrical battery according to claim 6, wherein the cylindrical battery includes a post, the current collecting plate is electrically connected to the post, the post has a groove portion, at least part of the protruding portion is embedded in the groove portion, a space is provided between a groove side wall of the groove portion and the peripheral wall portion, and the through hole communicates with the space.
  10. 10. The cylindrical battery of claim 9, wherein the slot side wall includes an arcuate wall section, an arcuate transition being provided at an end of the peripheral wall section remote from the planar plate section, the void being located between the arcuate transition and the arcuate wall section.
  11. 11. The cylindrical battery according to any one of claims 1 to 5, wherein a space region is formed between an end surface of the winding core facing the current collecting plate and the case, and the chamber communicates with the space region.

Description

Cylindrical battery Technical Field The application relates to the technical field of batteries, in particular to a cylindrical battery. Background At present, when thermal runaway occurs in the cylindrical battery, the exhaust is not timely, so that flammable gas in the battery is accumulated to cause deflagration, the integrity of the battery is damaged, the thermal management of the whole battery pack is not facilitated, and the safety of the whole battery pack is also influenced. Under the design condition that the explosion-proof valve structure of the cylindrical battery tends to be consistent, how to reasonably design an exhaust channel inside the cylindrical battery so as to ensure the integrity of the posture of the cylindrical battery when thermal runaway occurs becomes a technical problem which needs to be solved by the person skilled in the art at present. Disclosure of utility model The application aims to provide a cylindrical battery, which can smoothly discharge gas accumulated on the side of a current collecting disc to the side of a pressure relief structure in thermal runaway through reasonable design of an exhaust channel, and is beneficial to ensuring the integrity of the posture of the cylindrical battery. In order to solve the technical problems, the application provides a cylindrical battery, which comprises a shell and a winding core, wherein the winding core is positioned in the shell and is provided with a winding core hole, the cylindrical battery further comprises a pressure relief structure and a current collecting disc, the pressure relief structure and the current collecting disc are respectively arranged at two ends of the shell in the axial direction, the current collecting disc is electrically connected with a tab led out from the winding core, the current collecting disc comprises a protruding part, the protruding part is used for being electrically connected with a pole column assembly of the cylindrical battery, the protruding part is provided with a cavity, the cavity is communicated with the winding core hole, the distance between the surface of the protruding part facing the winding core and the end surface of a negative pole piece of the winding core facing the current collecting disc is h, the unit is mm, the radial dimension of the winding core hole is D, and the unit is mm, and h/D=0.2-1.8. By adopting the cylindrical battery, the bulge with the cavity is arranged on the current collecting disc, the cavity is communicated with the winding core hole, so that an exhaust channel is formed between the current collecting disc and the winding core, when the cylindrical battery is in thermal runaway, gas accumulated at the first end in the shell can be smoothly discharged to the winding core hole through the cavity and discharged to the end where the pressure release structure is located through the winding core hole, the phenomenon that the gas is accumulated at the end where the winding core is opposite to the pressure release structure is avoided, and the phenomenon that the battery is incomplete due to the fact that the accumulated gas impacts the related structure of the cylindrical battery at the first end is avoided, meanwhile, the h/D ratio is limited within the range of 0.2-1.8, on one hand, the problem that the gas cannot smoothly be discharged from the cavity to the winding core hole can be avoided, and on the other hand, the problem that the electrode lugs and the winding core hole are interfered due to overlarge winding core hole area can be avoided, and the exhaust problem can be avoided. Drawings Fig. 1 is a block diagram of a cylindrical battery according to an embodiment of the present application; fig. 2 is a view of the cylindrical battery shown in fig. 1 in another view; FIG. 3 is a cross-sectional view of a cylindrical battery in accordance with one embodiment of the present application; FIG. 4 is an enlarged view of a portion of the J1 portion of FIG. 3; FIG. 5 is an enlarged view of a portion of the J2 region of FIG. 4; FIG. 6 is a schematic illustration of a structure of a tab of a winding core before bending in an embodiment; Fig. 7 is a schematic structural diagram of a winding core with tabs folded and laminated. Reference numerals illustrate: a cylindrical battery 10, a first end 101, a second end 102; the casing 11, the casing 111, the casing peripheral portion 1111, the casing bottom portion 1112, the cover 112; winding core 12, winding core hole 121, end face 122, tab 123, tab 1231; A pressure relief structure 13; collector tray 14, boss 141, flat plate 1411, peripheral wall 1412, arcuate transition 14121, through holes 1413, tray 142; a pole 15, a groove portion 151, an arc-shaped wall section 1511; chamber 1S, void 2S, spatial region 3S. Detailed Description In order to better understand the aspects of the present application, the present application will be described in further detail with reference to the accompanying drawings and deta