Single cell

Abstract

The utility model provides a kind of single battery, it includes: shell, electrode assembly and first insulating tape, first insulating tape is surrounded in the outer periphery of the first end of the winding structure of electrode assembly, including the vertical portion being connected with the axial arrangement and the flat portion being radially arranged, flat portion is formed with crease;Single battery further includes insulating piece, including main body and extension, main body is between first insulating tape and end wall along the axial direction, extension is located in the side of main body facing electrode assembly, and extend towards the direction close to electrode assembly;Extension abuts on the preset area of first insulating tape, preset area is the surface of flat portion facing end wall and / or the surface of vertical portion facing side wall. By setting the specific structure of the extension of insulating piece, without affecting the height of electrode assembly, reduce the risk that electrolyte enters the inside of winding structure through the channel formed by the crease of flat portion.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a single-cell battery. Background Technology

[0002] In recent years, with the rapid development of electric vehicles, consumer electronics, and new energy storage systems, battery technology has become an important factor in the development of electric vehicles.

[0003] In the development of battery technology, how to improve the yield rate of individual cells is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a single cell battery.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A single-cell battery, comprising:

[0007] The housing includes an end wall and a side wall surrounding the end wall, the end wall and the side wall forming a receiving cavity;

[0008] An electrode assembly is located within the receiving cavity. The electrode assembly includes a winding structure formed by stacking and winding a first electrode, a diaphragm, and a second electrode. The winding structure includes a first end and a second end disposed opposite to each other along the axial direction. Along the axial direction, the first end is closer to the end wall than the second end.

[0009] A first insulating tape is disposed around the outer periphery of the first end of the winding structure at least once. The first insulating tape includes a vertical portion disposed along the axial direction and a flat portion disposed along the radial direction. The vertical portion covers the side surface of the winding structure. The flat portion is located between the surface of the winding structure facing the end wall and the end wall. The flat portion has creases.

[0010] Its characteristics are,

[0011] The single cell also includes an insulating component, which includes a main body and an extension. The main body is located between the first insulating strip and the end wall along the axial direction. The extension is located on the side of the main body facing the electrode assembly and extends toward the electrode assembly. The extension is continuously arranged in a circumferential closed loop.

[0012] The extension abuts against a predetermined area of ​​the first insulating strip, the predetermined area being the surface of the flat portion facing the end wall and / or the surface of the upright portion facing the side wall.

[0013] In this technical solution, because the flat portion of the first insulating strip has creases, when there is electrolyte residue, the electrolyte will flow through the creases and enter the interior of the winding structure, causing a short circuit. However, by setting the specific structure of the extension portion of the insulating member, that is, by setting the extension portion to abut against the preset area of ​​the first insulating strip, and the extension portion is continuously arranged in a closed loop along the circumference, a circular contact surface is formed. This reduces the risk of electrolyte entering the interior of the winding structure through the channels formed by the creases of the flat portion without affecting the height of the electrode assembly, thereby avoiding short circuits and improving the yield of single cells.

[0014] Preferably, the extension includes a first extension and / or a second extension;

[0015] The end face of the first extension away from the main body abuts against the surface of the flat portion facing the end wall;

[0016] The surface of the second extension facing the winding structure abuts against the surface of the upright portion facing the sidewall.

[0017] Preferably, the first end of the winding structure is provided with a first tab, and the single cell further includes a first current collector, the first current collector being located between the first tab and the end wall of the housing along the axial direction, and the flat portion covering at least a portion of the outer edge of the first current collector along the radial direction and the surface facing the end wall.

[0018] The end face of the first extension away from the main body abuts against the portion of the flat portion that does not cover the first collector plate.

[0019] Preferably, the distance between the end face of the first extension abutting the flat portion and the base surface of the body facing the winding structure is less than or equal to the distance from the surface of the first collector plate facing the body to the base surface; and / or,

[0020] The maximum dimension of the first extension along the radial direction is 0.1mm-0.6mm.

[0021] Preferably, the dimension of the second extension gradually decreases along the radial direction from near the body to away from the body; and / or,

[0022] The maximum dimension of the second extension along the radial direction is 0.1mm-0.25mm.

[0023] Preferably, the second extension is connected to a base surface on the side of the body facing the winding structure, and the second extension includes a first surface away from the winding structure and a second surface close to the winding structure along the radial direction;

[0024] The second surface extends obliquely outward along the axial direction.

[0025] Preferably, the first electrode includes a first coating portion coated with a first active material layer and a first tab located on the side of the first coating portion along the axial direction near the end wall; the second electrode includes a second coating portion coated with a second active material layer and a second tab located on the side of the second coating portion along the axial direction away from the end wall.

[0026] Along the axial direction, the distance between the end face of the second extension away from the body and the end wall is d1, and the distance between the end face of the second coating portion near the end wall and the end wall is d2, wherein d1 < d2.

[0027] Preferably, the single cell further includes an electrode post that passes through the end wall and is insulated from the end wall by the insulating member;

[0028] The electrode post has a through-hole for injecting electrolyte along the axial direction, and / or, apart from the mounting hole through which the electrode post passes, the insulating component does not have a conductive channel for conducting electrolyte in any direction.

[0029] Preferably, the flat portion is an integral continuous structure along the circumference of the winding structure.

[0030] Preferably, the single cell further includes a second insulating strip, which surrounds the outer periphery of the winding structure and is located between the first end and the second end along the axial direction;

[0031] Along the radial direction of the winding structure, the orthographic projections of the first insulating strip and the second insulating strip overlap, and the first insulating strip covers the second insulating strip.

[0032] The positive and progressive effects of this utility model are as follows:

[0033] In this invention, by setting a specific structure for the extension of the insulating member, that is, by setting the extension to abut against a preset area of ​​the first insulating strip, and by setting the extension to be continuously arranged in a closed loop along the circumference, a circular contact surface is formed. This reduces the risk of electrolyte entering the interior of the winding structure through the channel formed by the folds of the leveling part without affecting the height of the electrode assembly, thereby avoiding short circuits and improving the yield of individual cells. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a single cell battery according to a preferred embodiment of the present invention.

[0035] Figure 2 This is a partial three-dimensional structural diagram of a single battery cell according to a preferred embodiment of the present invention.

[0036] Figure 3 This is a three-dimensional structural diagram of the electrode assembly of a single-cell battery according to a preferred embodiment of the present invention.

[0037] Figure 4 This is a partial cross-sectional view of the electrode assembly of a single-cell battery according to a preferred embodiment of the present invention.

[0038] Figure 5 This is a cross-sectional structural schematic diagram of a single cell in a preferred embodiment of the present invention.

[0039] Figure 6 for Figure 5 A magnified schematic diagram of part A in the middle.

[0040] Figure 7 for Figure 5 A magnified schematic diagram of part B in the middle section.

[0041] Figure 8 This is a partial cross-sectional view of a single cell structure according to another preferred embodiment of the present invention.

[0042] Figure 9 for Figure 8 A magnified schematic diagram of part C in the middle.

[0043] Figure 10 This is a partial cross-sectional view of a single cell in another preferred embodiment of the present invention.

[0044] Figure 11 for Figure 10 A magnified schematic diagram of part D in the middle section.

[0045] Figure 12 This is a partial cross-sectional view of a single cell in another preferred embodiment of the present invention.

[0046] Figure 13 for Figure 12 A magnified schematic diagram of part E in the middle section.

[0047] Figure 14 This is a partial cross-sectional view of the electrode assembly of a single cell battery according to a preferred embodiment of the present invention.

[0048] Figure 15 This is a schematic diagram of the battery pack structure according to a preferred embodiment of the present invention.

[0049] Figure 16 This is a schematic diagram of the structure of an electronic device according to a preferred embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures

[0051] Electronic device 1000; working part 300; battery pack 100; housing 110; housing cover 120; single cell 1; casing 10; end wall 11; side wall 12; receiving cavity 13; opening 14; crimping part 15; electrode assembly 20; winding structure 201; center hole 2011; first electrode 21; first electrode tab 211; first active material layer 212; first coating part 213; first electrode starting end 217; first electrode ending end 218; separator 22; separator starting end 221; separator ending end 222; second electrode 23; the first Diode tab 231; Second active material layer 232; Second coating portion 233; Second electrode starting end 237; Second electrode ending end 238; First end 25; Second end 26; First insulating tape 30; Vertical portion 31; Flat portion 32; Insulating component 40; Main body 41; Base surface 411; Extension portion 42; First extension portion 421; Second extension portion 422; First surface 423; Second surface 424; First collector plate 51; Second collector plate 52; Electrode post 60; Liquid injection hole 61; Second insulating tape 70; Cover plate 80; Second insulating component 90. Detailed Implementation

[0052] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0053] like Figures 1 to 7 As shown, this embodiment provides a single-cell battery 1. The single-cell battery 1 includes: a casing 10, an electrode assembly 20, and a first insulating strip 30.

[0054] The housing 10 includes an end wall 11 and a side wall 12 surrounding the end wall 11. The end wall 11 and the side wall 12 form a receiving cavity 13 for accommodating the electrode assembly 20, electrolyte, and other necessary battery components. The connection between the end wall 11 and the side wall 12 can be achieved in various ways, such as integral stamping, integral casting, or separate welding.

[0055] Electrode assembly 20 is located within receiving cavity 13. Electrode assembly 20 includes a winding structure 201, which is formed by stacking and winding a first electrode 21, a diaphragm 22, and a second electrode 23 (see reference). Figure 3 and Figure 4 The winding structure 201 includes a first end 25 and a second end 26 disposed opposite to each other along the axial direction P. Along the axial direction P, the first end 25 is closer to the end wall 11 than the second end 26.

[0056] The first insulating tape 30 is disposed around the outer periphery of the first end 25 of the winding structure 201 at least once. The first insulating tape 30 includes a vertical portion 31 disposed along the axial direction P and a flat portion 32 disposed along the radial direction R connected to each other. The vertical portion 31 covers the side surface of the winding structure 201, and the flat portion 32 is located between the surface of the winding structure 201 facing the end wall 11 and the end wall 11. The flat portion 32 has creases.

[0057] The single cell 1 also includes an insulating member 40 (referred to as the first insulating member), which includes a main body 41 and an extension 42. The main body 41 is located between the first insulating strip 30 and the end wall 11 along the axial direction P. The extension 42 is located on the side of the main body 41 facing the electrode assembly 20 and extends towards the electrode assembly 20. The extension 42 is continuously arranged in a closed loop along the circumferential direction Q. The extension 42 abuts against a predetermined area of ​​the first insulating strip 30. The predetermined area is the surface of the flat part 32 facing the end wall 11 and / or the surface of the upright part 31 facing the side wall 12.

[0058] Thus, because the flat portion 32 of the first insulating tape 30 has creases, when electrolyte residue is present, the electrolyte will flow along the creases into the electrode assembly 20, causing a short circuit. However, by specifically designing the extension portion 42 of the insulating member 40—that is, by having the extension portion 42 abut against a predetermined area of ​​the first insulating tape 30 (the surface of the flat portion 32 facing the end wall 11 and / or the surface of the upright portion 31 facing the side wall 12) and the extension portion 42 continuously arranged in a closed loop along the circumferential direction Q—a circular contact surface is formed. This reduces the risk of electrolyte entering the electrode assembly 20 through the channels formed by the creases of the flat portion 32 without affecting the height of the electrode assembly 20, thereby avoiding short circuits and improving the yield of the single cell 1. It should be noted that both the first end 25 and the second end 26 of the winding structure 201 include the end face of that end and the outer periphery near the end face. Figure 2 In order to better show the internal structure of the housing 10, the housing 10 is removed.

[0059] Preferably, when the extension 42 abuts against the surface of the flat portion 32 facing the end wall 11, it abuts against the outer ring region a of the flat portion 32. The flat portion 32 includes an inner ring region located radially close to the center of the main body 41 and an outer ring region a located radially outside the inner ring region. Since the wrinkles formed by the creases of the flat portion 32 become more severe towards the center of the winding structure 201, by providing the extension 42 to abut against the outer ring region a, that is, by providing the extension 42 to abut against the part that is farther away from the severely creased area relative to the inner ring region, the severely creased part can be avoided, and the electrolyte can be more effectively prevented from entering the interior of the electrode assembly 20 along the channel formed by the creases.

[0060] In this embodiment, the first electrode 21 is a positive electrode and the second electrode 23 is a negative electrode; however, it is not limited to this. In other embodiments, the first electrode 21 may be a negative electrode and the second electrode 23 may be a positive electrode.

[0061] Specifically, the extension 42 includes a first extension 421 and / or a second extension 422; the end face of the first extension 421 away from the main body 41 abuts against the surface of the flat portion 32 facing the end wall 11; the surface of the second extension 422 facing the winding structure 201 abuts against the surface of the upright portion 31 facing the side wall 12.

[0062] Please refer to the following: Figure 5 and Figure 6 In one embodiment of this invention, the extension 42 includes only a first extension 421. Specifically, the end face of the first extension 421 away from the main body 41 abuts against the surface of the flat portion 32 facing the end wall 11. In this way, by setting the end face of the first extension 421 away from the main body 41 to abut against the surface of the flat portion 32 facing the end wall 11, it is possible to more effectively prevent electrolyte from entering the interior of the electrode assembly 20 through the channel formed by the creases of the leveling portion 32 in areas with fewer folds.

[0063] But not limited to this, such as Figure 8 and Figure 9 As shown, in another embodiment of this example, the extension 42 includes only the second extension 422. Specifically, the surface of the second extension 422 facing the winding structure 201 abuts against the surface of the upright portion 31 facing the side wall 12. In this way, by setting the end of the second extension 422 away from the main body 41 to abut against the surface of the upright portion 31 facing the side wall 12, the electrolyte can be better guided along the upright portion 31 to the bottom of the battery, thereby preventing the electrolyte from entering the flat portion 32.

[0064] Furthermore, such as Figure 10 and Figure 11 As shown, in another embodiment of this example, the extension 42 includes both a first extension 421 and a second extension 422.

[0065] The first end 25 of the winding structure 201 is provided with a first tab 211. The single cell 1 also includes a first current collector 51, which is located axially P between the first tab 211 and the end wall 11 of the housing 10. The flat portion 32 covers at least a portion of the outer edge of the first current collector 51 along the radial direction R and the surface facing the end wall 11. The end face of the first extension 421 away from the main body 41 abuts against the portion of the flat portion 32 that does not cover the first current collector 51. That is, in addition to the end face of the first extension 421 away from the main body 41 abutting against the surface of the flat portion 32 facing the end wall 11, it further abuts against the portion of the flat portion 32 that does not cover the first current collector 51. In this way, by setting the end face of the first extension 421 away from the main body 41 to abut against the portion of the flat portion 32 that does not cover the first collector plate 51, the electrolyte can flow along the first extension 421 to the stepped surface of the first tab 211, and then flow to the area between the outer surface of the vertical portion 31 of the first insulating strip 30 and the side wall 12, preventing it from flowing into the interior of the electrode assembly 20. As described above, the first electrode 21 is a positive electrode, and the second electrode 23 is a negative electrode; correspondingly, the first tab 211 is a positive tab, and the second tab 231 is a negative tab.

[0066] Preferably, the distance b1 between the end face of the first extension 421 abutting against the flat portion 32 and the base surface 411 on the side of the main body 41 facing the winding structure 201 is less than or equal to the distance b2 between the surface of the first collector plate 51 facing the main body 41 and the base surface 411. This avoids the first extension 421 interfering with the height space of the electrode assembly 20, thereby increasing the energy density. Furthermore, the first extension 421 can abut against the first tab 211 on the outer periphery of the first collector plate 51, preventing electrode misalignment in this area and causing changes in the positive and negative OH groups. It should be noted that the base surface 411 on the side of the main body 41 facing the winding structure 201 refers to the flat surface of the side of the main body 41 facing the winding structure 201.

[0067] Preferably, the maximum radial dimension c1 of the first extension 421 is 0.1mm-0.6mm. Since the inner diameter of the housing 10 is 45.4mm and the diameter of the electrode assembly 20 is 43.9-44.8mm, controlling the maximum radial dimension c1 of the first extension 421 to be 0.1mm-0.6mm can avoid interference.

[0068] like Figure 12 and Figure 13 As shown, in another embodiment of this example, the second extension 422 gradually decreases in size along the radial direction from near the main body 41 to away from the main body 41 along the axial direction P. That is, the second extension 422 forms a structure in which the width gradually decreases downward along the axial direction P from near the main body 41 to away from the main body 41, so as to facilitate the guide of the electrode assembly 20 into the housing and to avoid damage to the first electrode tab 211.

[0069] Preferably, the second extension 422 is connected to the base surface 411 on the side of the main body 41 facing the winding structure 201. The second extension 422 includes a first surface 423 away from the winding structure 201 and a second surface 424 close to the winding structure 201 along the radial direction R. The second surface 424 extends obliquely outward along the axial direction P to further facilitate the guidance of the electrode assembly 20 into the housing and to avoid damage to the first electrode tab 211. The first surface 423 extends vertically along the axial direction P to avoid interference with the sidewall 12 of the housing 10.

[0070] Preferably, the maximum radial dimension c2 of the second extension 422 is 0.1mm-0.25mm. By setting the range of values ​​for the maximum radial dimension c2 of the second extension 422, the height of the electrode assembly 20 is reduced, thereby increasing the energy density of the single cell 1. More preferably, the outermost three turns of the first tab 211 of the wound structure 201 are cut off to avoid the second extension 422, allowing for a larger assembly tolerance and preventing interference between the electrode assembly 20 and the insulating member 40 when the electrode assembly 20 is inserted into the casing, thus avoiding affecting the morphology of the first tab 211 and causing it to be inserted internally. It should be noted that, since in this embodiment, the second extension 422 has a structure whose width gradually decreases downwards along the axial direction P, the maximum radial dimension c2 (width) of the second extension 422 refers to the dimension at the end closest to the main body 41.

[0071] Preferably, the first electrode 21 includes a first coating portion 213 coated with a first active material layer 212, and a first tab 211 located on the side of the first coating portion 213 along the axial direction P near the end wall 11; the second electrode 23 includes a second coating portion 233 coated with a second active material layer 232, and a second tab 231 located on the side of the second coating portion 233 along the axial direction P away from the end wall 11. Along the axial direction P, the distance between the end face of the second extension portion 422 away from the main body 41 and the end wall 11 is d1, and the distance between the end face of the second coating portion 233 along the axial direction P near the end wall 11 and the end wall 11 is d2 (not shown in the figure), wherein d1 < d2, so as to avoid interference between the end face of the second extension portion 422 away from the main body 41 and the interface of the second active material layer 232 during the charge and discharge expansion of the electrode assembly 20, which would cause unevenness of the interface of the second active material layer 232 and affect lithium plating.

[0072] In this embodiment, as described above, the first electrode 21 is a positive electrode and the second electrode 23 is a negative electrode; correspondingly, the first tab 211 is a positive tab and the second tab 231 is a negative tab; the first active material layer 212 is a positive active material layer and the second active material layer 232 is a negative active material layer.

[0073] Preferably, the housing 10 of the single cell 1 has an opening 14 at the end of the cavity 13 away from the end wall 11; the single cell 1 also includes a cover plate 80, which is installed in the opening 14; along the axial direction P, the distance between the end face of the second coating portion 233 near the cover plate 80 and the inner surface of the cover plate 80 is greater than or equal to 2.4 mm. That is, the liquid level of the residual electrolyte does not exceed the negative electrode active material layer. The spacing between the cover plate 80 and the electrode assembly 20 is appropriately reserved to accommodate excess electrolyte, so that nickel-containing electrolyte is deposited on the cover plate 80 from the top without entering the interior of the electrode assembly 20.

[0074] In this embodiment, the single cell 1 also includes an electrode post 60, which passes through the end wall 11 and is insulated from the end wall 11 by an insulating member 40.

[0075] The terminal post 60 has a through-hole 61 along the axial direction P to avoid opening the cover plate 80 for electrolyte injection. Opening the cover plate 80 for electrolyte injection requires inverting the individual battery 1, which can easily lead to electrolyte residue. The electrolyte injection hole 61 in the terminal post 60 prevents excessive electrolyte residue between the insulating component 40 and the end wall 11 of the housing 10, thus reducing electrolyte residue. The center hole 2011 of the winding structure 201 corresponds to the electrolyte injection hole 61.

[0076] Except for the mounting holes through which the electrode post 60 passes, the insulating component 40 does not have any through-holes for conducting electrolyte in any direction. That is, except for the mounting holes through which the electrode post 60 passes, the insulating component 40 does not have any through-holes in any direction, thereby effectively preventing nickel-containing electrolyte from flowing into the interior of the electrode assembly 20.

[0077] Preferably, the flat portion 32 is a continuous structure along the circumferential direction Q of the winding structure 201. That is, the portion of the flat portion 32 covering the surface of the first current collector 51 has no tangent, preventing electrolyte containing nickel ions from flowing into the top of the electrode assembly 20. Furthermore, it allows the end face of the extension portion 42 to fit more closely with the flat portion 32, forming a complete closed surface. It should be noted that if a tangent exists, the electrolyte can enter the inner wall of the electrode assembly 20 along the cut, and the tangent can easily reduce the rate at which the first insulating tape 30 is applied, thus reducing the production efficiency of the single cell 1.

[0078] Preferably, please refer to Figure 2 and Figure 4 The single cell 1 also includes a second insulating strip 70, which surrounds the outer periphery of the winding structure 201 and is located between the first end 25 and the second end 26 along the axial direction P. Along the radial direction R of the winding structure 201, the orthographic projection portions of the first insulating strip 30 and the second insulating strip 70 overlap, with the first insulating strip 30 covering the second insulating strip 70. Thus, by setting the orthographic projection portions of the first insulating strip 30 and the second insulating strip 70 to overlap (… Figure 2 The first insulating strip 30 covers the second insulating strip 70, so that the electrolyte flowing down the insulating member 40 can flow down the first insulating strip 30 and the second insulating strip 70, preventing it from flowing into the interior of the electrode assembly 20. If there is a gap between the first insulating strip 30 and the second insulating strip 70, the electrolyte can easily flow into the diaphragm 22; if the second insulating strip 70 covers the positive electrode first insulating strip 30, it will hinder the flow of the electrolyte.

[0079] exist Figure 4 In the winding structure 201, the first electrode 21 includes a starting end 217 and a ending end 218; the second electrode 23 includes a starting end 237 and a ending end 238. The diaphragm 22 includes a starting end 221 and a ending end 222. The second insulating tape 70 includes, but is not limited to, a finishing tape for fixing the ending end 222 of the diaphragm. That is, the second insulating tape 70 can be a finishing tape or other insulating structures, such as a Mylar film. Regardless of the structure of the second insulating tape 70, its radial portion R along the winding structure 201 overlaps with the orthographic projection portion of the first insulating tape 30.

[0080] The housing 10 of the single battery cell 1 also includes a crimping portion 15, which is formed at one end of the side wall 12 near the opening 14 and is recessed into the housing 10.

[0081] The single cell 1 also includes a second insulating member 90 and a second current collector 52. The second insulating member 90 surrounds the periphery of the cover plate 80 to insulate and seal the cover plate 80 and the housing 10. The second current collector 52 is disposed between the electrode assembly 20 and the cover plate 80 and is electrically connected to the housing 10. The connecting piece of the second current collector 52 is located on the side of the crimping portion 15 facing the electrode assembly 20 and is welded to the crimping portion 15. In this way, by setting the connecting piece of the second current collector 52 to be located on the side of the crimping portion 15 facing the electrode assembly 20 and welded to the crimping portion 15, the welding area of ​​the second current collector 52 and the second tab 231 is located closer to the electrode assembly 20 than the crimping portion 15. This prevents the crimping portion 15 from affecting the welding area between the tab and the second current collector 52, thereby improving the welding strength between the second tab 231 and the second current collector 52.

[0082] In this embodiment, the first collector plate 51 corresponds to the first tab 211, and the first tab 211 is electrically connected to the pole post 60 through the first collector plate 51; the second collector plate 52 corresponds to the second tab 231, and the second tab 231 is electrically connected to the housing 10 through the second collector plate 52.

[0083] In this embodiment, the single cell 1 is a cylindrical cell. Cylindrical cells have advantages such as high energy density, long cycle life, and good safety performance. However, it is not limited to this; in other embodiments, the single cell 1 can also be a prismatic cell or other shaped cells. In this embodiment, the first tab 211 is a folded tab. When welding the tabs and current collector of the cylindrical cell, the pretreatment steps of the tabs include two different processing methods: one is a flattening tab processing method, and the other is the folded tab processing method used for the positive tab in this embodiment. Similarly, the second tab 231 is also a folded tab.

[0084] like Figure 15 As shown, this utility model also provides a battery pack 100, which includes the aforementioned single battery cell 1. In one embodiment of the battery pack 100, the battery pack 100 includes a housing 110, a cover 120, and multiple single batteries 1. The multiple single batteries 1 are placed in the housing 110 and connected in series or parallel, or a combination of series and parallel connections. The cover 120 seals the housing 110 to protect the multiple single batteries 1. It should be noted that, in addition to the single battery cell 1 of this utility model, the battery pack 100 may also include a battery pack thermal management system, circuit board, etc. The battery pack 100 can be a battery module, a battery pack, an energy storage cabinet, etc.; these will not be described in detail here.

[0085] like Figure 16 As shown, this utility model also provides an electronic device 1000, which includes the aforementioned battery pack 100. A working part 300 is electrically connected to the battery pack 100 to obtain electrical power. As an example, the electronic device 1000 is a vehicle, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, but are not limited thereto. The working part 300 is the vehicle body, and the battery pack 100 is located at the bottom of the vehicle body, providing electrical power for the vehicle's operation or the operation of its internal electrical components. However, in other embodiments, the electronic device 1000 can also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part 300 can be a unit component capable of obtaining electrical power from the battery pack 100 and performing corresponding work, such as a fan blade rotation unit or a vacuum cleaner suction unit. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the aforementioned electronic device 1000.

[0086] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A single-cell battery, comprising: The housing includes an end wall and a side wall surrounding the end wall, the end wall and the side wall forming a receiving cavity; An electrode assembly is located within the receiving cavity. The electrode assembly includes a winding structure formed by stacking and winding a first electrode, a diaphragm, and a second electrode. The winding structure includes a first end and a second end disposed opposite to each other along its axial direction. Along the axial direction, the first end is closer to the end wall than the second end. A first insulating tape is disposed around the outer periphery of the first end of the winding structure at least once. The first insulating tape includes a vertical portion disposed along the axial direction and a flat portion disposed along the radial direction. The vertical portion covers the side surface of the winding structure. The flat portion is located between the surface of the winding structure facing the end wall and the end wall. The flat portion has creases. Its features are, The single cell also includes an insulating component, which includes a main body and an extension. The main body is located between the first insulating strip and the end wall along the axial direction. The extension is located on the side of the main body facing the electrode assembly and extends toward the electrode assembly. The extension is continuously arranged in a circumferential closed loop. The extension abuts against a predetermined area of ​​the first insulating strip, the predetermined area being the surface of the flat portion facing the end wall and / or the surface of the upright portion facing the side wall.

2. The single-cell battery as described in claim 1, characterized in that, The extension includes a first extension and / or a second extension; The end face of the first extension away from the main body abuts against the surface of the flat portion facing the end wall; The surface of the second extension facing the winding structure abuts against the surface of the upright portion facing the sidewall.

3. The single-cell battery as described in claim 2, characterized in that, The first end of the winding structure is provided with a first tab, and the single cell also includes a first current collector. The first current collector is located between the first tab and the end wall of the housing along the axial direction, and the flat portion covers at least a portion of the outer edge of the first current collector along the radial direction and the surface facing the end wall. The end face of the first extension away from the main body abuts against the portion of the flat portion that does not cover the first collector plate.

4. The single-cell battery as described in claim 3, characterized in that, The distance between the end face of the first extension abutting the flat portion and the base surface of the main body facing the winding structure is less than or equal to the distance from the surface of the first collector plate facing the main body to the base surface; and / or, The maximum dimension of the first extension along the radial direction is 0.1mm-0.6mm.

5. The single-cell battery as described in claim 2, characterized in that, The second extension gradually decreases in size along the radial direction from near the body to away from the body; and / or, The maximum dimension of the second extension along the radial direction is 0.1mm-0.25mm.

6. The single-cell battery as described in claim 5, characterized in that, The second extension is connected to the base surface of the main body facing the winding structure, and the second extension includes a first surface away from the winding structure and a second surface close to the winding structure along the radial direction; The second surface extends obliquely outward along the axial direction.

7. The single-cell battery as described in claim 5, characterized in that, The first electrode includes a first coating portion coated with a first active material layer and a first tab located on the side of the first coating portion along the axial direction near the end wall; the second electrode includes a second coating portion coated with a second active material layer and a second tab located on the side of the second coating portion along the axial direction away from the end wall; Along the axial direction, the distance between the end face of the second extension away from the body and the end wall is d1, and the distance between the end face of the second coating portion near the end wall and the end wall is d2, wherein d1 < d2.

8. The single-cell battery as described in claim 1, characterized in that, The single cell also includes an electrode post that passes through the end wall and is insulated from the end wall by the insulating member; The electrode post has a through-hole for injecting electrolyte along the axial direction, and / or, apart from the mounting hole through which the electrode post passes, the insulating component does not have a conductive channel for conducting electrolyte in any direction.

9. The single-cell battery as described in claim 1, characterized in that, The flat portion is a continuous integral structure along the circumference of the winding structure.

10. The single-cell battery as described in claim 1, characterized in that, The single cell also includes a second insulating strip, which surrounds the outer periphery of the winding structure and is located between the first end and the second end along the axial direction. Along the radial direction of the winding structure, the orthographic projections of the first insulating strip and the second insulating strip overlap, and the first insulating strip covers the second insulating strip.

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