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CN-224217490-U - Cylindrical battery, battery pack and electronic device

CN224217490UCN 224217490 UCN224217490 UCN 224217490UCN-224217490-U

Abstract

The utility model provides a cylindrical battery, a battery pack and an electronic device. The cylindrical battery comprises a shell, an electrode assembly accommodated in the shell, wherein the electrode assembly comprises a positive plate, a diaphragm and a winding structure formed by stacking and winding the negative plate, a negative electrode current collector of the negative plate comprises a negative electrode coating active material area and a negative electrode non-coating active material area, the negative electrode non-coating active material area comprises a negative electrode vertical part arranged along the height direction, a negative electrode flat part arranged along the radial direction and a negative electrode bending part connected between the negative electrode vertical part and the negative electrode flat part, at least part of the area of the negative electrode vertical part is covered with a reinforcing layer, the distance between the second edge of the reinforcing layer far away from the negative electrode coating active material area and the diaphragm along the preset direction is d1, and the value range of d1 is 0.2-3 mm. Through setting up the regional enhancement layer that covers of part of negative pole upright portion, can improve the support nature that the negative pole utmost point ear was buckled to avoid scalding the diaphragm, improved the security of electric core.

Inventors

  • JI PENG

Assignees

  • 株式会社AESC日本

Dates

Publication Date
20260508
Application Date
20250513

Claims (10)

  1. 1. A cylindrical battery, comprising: A housing; An electrode assembly accommodated in the case, the electrode assembly including a winding structure in which a positive electrode sheet, a separator, and a negative electrode sheet are stacked and wound, the positive electrode sheet including a positive electrode current collector, the negative electrode sheet including a negative electrode current collector, the negative electrode current collector including a negative electrode coated active material region covered with a negative electrode active material layer and a negative electrode uncoated active material region uncovered with the negative electrode active material layer along a height direction of the winding structure; The negative electrode uncoated active material region includes a negative electrode standing portion provided in the height direction, a negative electrode flat portion provided in a radial direction of the winding structure, and a negative electrode bending portion connected between the negative electrode standing portion and the negative electrode flat portion; At least part of the area of the anode vertical part is covered with a reinforcing layer, the reinforcing layer comprises a first edge close to the anode active material coating area and a second edge far away from the anode active material coating area, the distance from the second edge to the anode non-coating active material coating area is d1, and the value range of d1 is 0.2-3 mm along the preset direction from the anode active material coating area to the anode non-coating active material coating area.
  2. 2. The cylindrical battery according to claim 1, wherein the separator extends beyond the anode-coated active material region by a distance d2 in the predetermined direction, and d 1/d 2 has a value in the range of 0.2 to 0.8.
  3. 3. The cylindrical battery of claim 1, wherein the reinforcement layer has a gray value of 0-192.
  4. 4. The cylindrical battery of claim 1, wherein the negative riser comprises a first negative side facing away from a central aperture of the winding structure and a second negative side facing toward the central aperture in a radial direction of the winding structure, wherein at least a partial region of the first negative side and/or the second negative side is covered with the reinforcing layer.
  5. 5. The cylindrical battery of claim 1, wherein the negative current collector has a thickness of less than or equal to 5.5 μιη and greater than or equal to 4 μιη.
  6. 6. The cylindrical battery according to claim 1, wherein at least a part of the negative electrode non-coated active material region forms a negative electrode tab, adjacent two of the negative electrode tabs having a predetermined pitch along a winding direction of the winding structure; The shape of the negative electrode tab is a positive trapezoid, the bottom of the positive trapezoid is close to the negative electrode active material coating area, and one end of the negative electrode tab, which is close to the negative electrode active material coating area, is covered with the reinforcing layer.
  7. 7. The cylindrical battery according to any one of claims 1-6, wherein the housing comprises a surrounding side wall, an end of the side wall being formed with an opening; The cylindrical battery further includes: A cover plate mounted to the opening; the negative electrode current collecting disc is arranged between the electrode assembly and the cover plate and is electrically connected with the shell, and one side of a connecting sheet of the negative electrode current collecting disc is welded with the negative electrode flat part.
  8. 8. The cylindrical battery according to claim 7, wherein the case further includes a crimping portion formed at an end of the side wall near the opening and recessed toward the inside of the case; The other side of the connecting piece of the negative electrode current collecting disc is welded with the crimping part; Or alternatively, the first and second heat exchangers may be, The outer periphery of the cover plate, one end, close to the opening, of the side wall of the shell and the outer periphery of the connecting sheet of the negative electrode current collecting disc are connected through welding.
  9. 9. A battery pack comprising the cylindrical battery according to any one of claims 1 to 8.
  10. 10. An electronic device comprising the battery pack of claim 9.

Description

Cylindrical battery, battery pack and electronic device Technical Field The present utility model relates to the field of batteries, and in particular, to a cylindrical battery, a battery pack, and an electronic device. Background In recent years, with the rapid development of electric vehicles, consumer electronics and novel energy storage systems, battery technology is an important factor related to the development of electric vehicles. In the development of battery technology, how to improve the safety of the battery cell is a technical problem to be solved in the battery technology. Disclosure of utility model The utility model aims to solve the technical problems in the prior art and provides a cylindrical battery, a battery pack and an electronic device. The utility model solves the technical problems by the following technical scheme: A cylindrical battery, characterized in that it comprises: A housing; An electrode assembly accommodated in the case, the electrode assembly including a winding structure in which a positive electrode sheet, a separator, and a negative electrode sheet are stacked and wound, the positive electrode sheet including a positive electrode current collector, the negative electrode sheet including a negative electrode current collector, the negative electrode current collector including a negative electrode coated active material region covered with a negative electrode active material layer and a negative electrode uncoated active material region uncovered with the negative electrode active material layer along a height direction of the winding structure; The negative electrode uncoated active material region includes a negative electrode standing portion provided in the height direction, a negative electrode flat portion provided in a radial direction of the winding structure, and a negative electrode bending portion connected between the negative electrode standing portion and the negative electrode flat portion; At least part of the area of the anode vertical part is covered with a reinforcing layer, the reinforcing layer comprises a first edge close to the anode active material coating area and a second edge far away from the anode active material coating area, the distance from the second edge to the anode non-coating active material coating area is d1, and the value range of d1 is 0.2-3 mm along the preset direction from the anode active material coating area to the anode non-coating active material coating area. In this technical scheme, through setting up the regional enhancement layer that covers of at least part of negative pole upright portion, can improve the supportability that the negative pole utmost point ear was buckled, specifically, because the negative pole utmost point ear begins to buckle at negative pole kink, through setting up the regional enhancement layer that covers of part of negative pole upright portion, can improve the position of bending in the direction of height to the welding zone of negative pole utmost point ear and the direction of height relative position of diaphragm have been increaseed, reach the purpose of avoiding scalding the diaphragm when the welding, have improved the security of electric core. Further, the second edge of the reinforcing layer is set to exceed the value range of the distance d1 of the diaphragm along the preset direction, so that on one hand, the distance d1 is prevented from being too small, the reinforcing layer cannot play a supporting role, and on the other hand, the distance d1 is prevented from being too large, the size of the winding structure along the height direction is prevented from being too large, and the energy density of the battery is influenced. Preferably, along the preset direction, the distance between the separator and the anode active material coating area is d2, and the d 1/d 2 range is 0.2-0.8. Preferably, the gray value of the reinforcing layer is 0-192. Preferably, in the radial direction of the winding structure, the negative upright comprises a first negative side facing away from the central hole of the winding structure and a second negative side facing towards the central hole, wherein at least a partial area of the first negative side and/or the second negative side is covered with the reinforcing layer. Preferably, the thickness of the negative electrode current collector is 5.5 μm or less and 4 μm or more. Preferably, at least part of the negative electrode non-coated active material areas form negative electrode tabs, and two adjacent negative electrode tabs have a preset distance along the winding direction of the winding structure; The shape of the negative electrode tab is a positive trapezoid, the bottom of the positive trapezoid is close to the negative electrode active material coating area, and one end of the negative electrode tab, which is close to the negative electrode active material coating area, is covered with the reinforcing layer. Preferably, the housing compr