Z-shaped continuous folding battery cell, battery and electric equipment

Abstract

The utility model belongs to the field of design or manufacturing of batteries, and particularly relates to a Z-shaped continuous folding battery cell, a battery and electric equipment. In order to improve the yield and the performance of a battery cell, the utility model provides a Z-shaped continuous folding battery cell. The Z-shaped continuous folding battery cell comprises a Z-shaped composite pole piece which is folded in a reciprocating manner, the composite pole piece is provided with at least two parallel first parts, a first positive plate is arranged between any two adjacent first parts, the composite pole piece comprises a second positive plate and a negative plate, and the second positive plate is arranged between any two adjacent negative plates. The utility model further discloses a battery comprising the Z-shaped continuous folding battery cell and electric equipment comprising the Z-shaped continuous folding battery cell. The composite pole piece internally comprises continuous positive and negative pole pieces, and the sizes of the pole pieces are consistent, so that the number of notches is reduced, the probability of burr occurrence is reduced, the utilization rate of the positive and negative pole pieces is improved, and the yield and the performance of the battery cell are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the design or manufacturing field of battery, especially relates to a Z type continuous folding electric core, battery and electric equipment. BACKGROUND

[0002] In the prior art, the electric core is mainly divided into a laminated electric core and a winding electric core. The laminated electric core is formed by laminating a plurality of pole pieces in sequence. Before lamination, a plurality of pole pieces need to be cut. During the cutting process, burrs may occur on the cutting edge of the pole piece. Once the cutting edge of the pole piece has burrs, the electric core is a substandard electric core with safety hazards. In order to ensure safety, there is a phenomenon of negative over positive (negative pole piece exceeding positive pole piece) in each layer of the laminated electric core, which leads to insufficient utilization of the positive and negative pole pieces and affects the energy density of the electric core. The winding electric core is formed by winding the pole pieces. During the winding process, the winding needle drives the pole pieces to be wound into a roll. Since the shape of the winding needle is square or rhombus, the winding needle gives the pole pieces a velocity component similar to a sine direction during the winding process, which leads to fluctuations in the tension of the pole pieces. In addition, the sizes of the inner and outer circles of the winding electric core are inconsistent, and the electric core is prone to deformation after being baked. The deformed electric core has safety hazards.

[0003] In order to improve the yield rate of the electric core as much as possible and avoid safety hazards of the electric core, a Z type laminated electric core is disclosed in a Chinese utility model patent with the authorization publication number CN220233266U and the authorization publication date of December 22, 2023. The electric core includes a negative pole piece folded in a "Z" shape. The negative pole piece includes a plurality of parallel first portions and a bending portion connecting adjacent two first portions. A composite pole piece is arranged between the two first portions. The composite pole piece includes a positive pole piece and a separator wrapped on the outer surface of the positive pole piece.

[0004] In the above-mentioned Z type laminated electric core, the negative pole piece is an entire pole piece without cutting, which can reduce the number of cutting times and thus reduce the probability of burrs in the electric core and improve the yield rate of the electric core.

[0005] However, in the above-mentioned Z type laminated electric core, on the one hand, all the positive pole pieces need to be formed by cutting, which still has a large number of cutting times, leading to a high probability of burrs and thus a high incidence of safety hazards of the electric core. On the other hand, at the bending portion of the negative pole piece, there is no positive pole piece opposite to the negative pole piece, and the positive and negative pole pieces cannot be fully utilized, resulting in a low energy density of the electric core. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a Z type continuous folding electric core to solve the technical problem of low energy density and high incidence of safety hazards of the existing winding and laminated electric cores.

[0007] The utility model discloses a battery, to solve the same technical problem above.

[0008] The utility model discloses a battery, to solve the same technical problem above.

[0009] To realize above -mentioned purpose, the technical scheme of Z type continuous folding electric core provided by the utility model is:

[0010] A Z type continuous folding electric core, including " Z " type reciprocating folding first pole piece, first pole piece has at least two parallel first part and the bending portion of connecting adjacent two first parts, and the first positive pole piece is arranged between any adjacent two first parts, and the diaphragm is arranged between the first positive pole piece and the first pole piece, and the first pole piece is a composite pole piece, and the composite pole piece includes one second positive pole piece and two negative pole pieces, and the second positive pole piece is arranged between the negative pole piece, or, the composite pole piece includes n second positive pole pieces and n+1 negative pole pieces, and n is equal to or greater than 2, and each second positive pole piece is arranged between different two negative pole pieces, and the diaphragm is arranged between each second positive pole piece and the negative pole piece.

[0011] Further, the diaphragm is stacked on both sides of the first pole piece.

[0012] Further, the length and height of all negative pole pieces are same, the height of the diaphragm is greater than the height of the negative pole piece, and the length of the diaphragm is greater than the length of the negative pole piece.

[0013] Further, the length and height of all negative pole pieces are same, and the length of the negative pole piece is greater than the length of the second positive pole piece, and the width of the negative pole piece is greater than the width of the second positive pole piece.

[0014] Further, the height of the first positive pole piece is equal to the height of the second positive pole piece.

[0015] Further, one end of the first positive pole piece is inserted into the bending portion.

[0016] Further, the width of the first positive pole piece is greater than the width of the first part.

[0017] Further, when the number of the second positive pole pieces is greater than two, the height and width of all second positive pole pieces are same.

[0018] The Z-type continuously folded battery cell has the advantages that: the Z-type continuously folded battery cell is an improved invention; in the Z-type continuously folded battery cell, the composite pole piece is folded along the "Z" shape, on one hand, the second positive pole piece in the composite pole piece is not cut, the number of cutting is effectively reduced, the probability of burr occurrence is reduced, the yield of the battery cell is improved, and the safety hazard rate is reduced; on the other hand, at the bending part of the composite pole piece, the positive pole piece and the negative pole piece are still opposite to each other, so that the utilization rate of the positive pole piece and the negative pole piece is improved, and the energy density of the battery cell is improved.

[0019] In the non-Z-type folded battery cell, there are cutouts at the four edges of each cut-out pole piece (including the positive pole piece and the negative pole piece), in the Z-type continuously folded battery cell, the number of cutouts is reduced due to the existence of the composite pole piece, and the probability of burr occurrence is reduced; meanwhile, the composite pole piece comprises continuous positive pole pieces and negative pole pieces, and the negative pole piece exists at the head and tail ends of the composite pole piece in the length direction, compared with the technical scheme that the negative pole piece exists in each layer of the folded battery cell, the utilization rate of the positive pole piece and the negative pole piece in the Z-type continuously folded battery cell is high, and the energy density of the Z-type continuously folded battery cell is improved.

[0020] Compared with the wound battery cell, since the Z-type continuously folded battery cell adopts the Z-type continuous folding technology, the size of each layer of the pole piece is consistent, there is no problem of the inner and outer rings in the wound battery cell, the deformation of the battery cell is low, and the yield and performance of the battery cell are improved.

[0021] To achieve the above object, the technical scheme of the battery provided by the utility model is:

[0022] A battery comprises a battery cell, the battery cell comprises a first pole piece folded along the "Z" shape, the first pole piece has at least two parallel first parts and a bending part connecting the adjacent two first parts, a first positive pole piece is arranged between any two adjacent first parts, a diaphragm is arranged between the first positive pole piece and the first pole piece, the first pole piece is a composite pole piece, the composite pole piece comprises a second positive pole piece and two negative pole pieces, the second positive pole piece is arranged between the negative pole pieces, or the composite pole piece comprises n second positive pole pieces and n+1 negative pole pieces, n is greater than or equal to 2, and each second positive pole piece is arranged between different two negative pole pieces; and a diaphragm is arranged between each second positive pole piece and the negative pole piece.

[0023] Furthermore, the diaphragms are stacked on both sides of the first pole piece.

[0024] Furthermore, the lengths and heights of all the negative pole pieces are the same, the height of the diaphragm is greater than the height of the negative pole piece, and the length of the diaphragm is greater than the length of the negative pole piece.

[0025] Further, the length and height of all the negative electrode sheets are the same, and the length of the negative electrode sheet is greater than the length of the second positive electrode sheet, and the width of the negative electrode sheet is greater than the width of the second positive electrode sheet.

[0026] Further, the height of the first positive electrode sheet is equal to the height of the second positive electrode sheet.

[0027] Further, one end of the first positive electrode sheet is inserted into the bending portion.

[0028] Further, the width of the first positive electrode sheet is greater than the width of the first portion.

[0029] Further, when the number of the second positive electrode sheets is greater than two, the height and width of all the second positive electrode sheets are the same.

[0030] The battery has the following beneficial effects: the battery is an improved invention.

[0031] In the non-Z-type folded jelly-roll, there are cuts at the four edges of each cut-out electrode sheet (including positive electrode sheets and negative electrode sheets), and in the present application, the number of cuts is reduced by the presence of the composite electrode sheet, which can reduce the probability of burr occurrence.

[0032] Compared with the jelly-roll, the Z-type continuous folding jelly-roll uses Z-type continuous folding technology, the size of each layer of electrode sheet is consistent, there is no problem of inner and outer rings in the jelly-roll, the jelly-roll has low deformation, which is conducive to improving the yield and performance of the jelly-roll.

[0033] To achieve the above-mentioned purpose, the technical scheme of the electric equipment provided by the present application is as follows:

[0034] The utility model provides an electric equipment, including battery, the battery includes electric core, the electric core includes the first pole piece of 'Z' type reciprocating folding, the first pole piece has at least two parallel first parts and the bending part of connecting adjacent two first parts, set up a first positive pole piece between any adjacent two first parts, set up the diaphragm between the first positive pole piece and the first pole piece, the first pole piece is the composite pole piece, and the composite pole piece includes a second positive pole piece and two negative pole pieces, and the second positive pole piece is arranged between the negative pole pieces, or, the composite pole piece includes n second positive pole pieces and n+1 negative pole pieces, n is equal to or greater than 2, and each second positive pole piece is arranged between different two negative pole pieces, and the diaphragm is arranged between each second positive pole piece and the negative pole piece.

[0035] Further, the diaphragm is stacked on both sides of the first pole piece.

[0036] Further, the length and height of all the negative pole pieces are the same, the height of the diaphragm is greater than the height of the negative pole piece, and the length of the diaphragm is greater than the length of the negative pole piece.

[0037] Further, the length and height of all the negative pole pieces are the same, and the length of the negative pole piece is greater than the length of the second positive pole piece, and the width of the negative pole piece is greater than the width of the second positive pole piece.

[0038] Further, the height of the first positive pole piece is equal to the height of the second positive pole piece.

[0039] Further, one end of the first positive pole piece is inserted into the bending part.

[0040] Further, the width of the first positive pole piece is greater than the width of the first part.

[0041] Further, when the number of the second positive pole pieces is greater than two, the height and width of all the second positive pole pieces are the same.

[0042] The utility model provides an electric equipment, including battery, the battery includes electric core, the electric core includes the first pole piece of 'Z' type reciprocating folding, the first pole piece has at least two parallel first parts and the bending part of connecting adjacent two first parts, set up a first positive pole piece between any adjacent two first parts, set up the diaphragm between the first positive pole piece and the first pole piece, the first pole piece is the composite pole piece, and the composite pole piece includes a second positive pole piece and two negative pole pieces, and the second positive pole piece is arranged between the negative pole pieces, or, the composite pole piece includes n second positive pole pieces and n+1 negative pole pieces, n is equal to or greater than 2, and each second positive pole piece is arranged between different two negative pole pieces, and the diaphragm is arranged between each second positive pole piece and the negative pole piece.

[0043] In the non-Z type folded jelly-roll battery, there are cuts at four edges of each cut-out jelly-roll (including positive jelly-roll and negative jelly-roll), in the utility model, the existence of the composite jelly-roll reduces the number of cuts, and can reduce the probability of burr occurrence; meanwhile, the composite jelly-roll comprises continuous positive jelly-roll and negative jelly-roll, and the composite jelly-roll only has the phenomenon of negative over positive at the head and tail ends in the length direction, compared with the technical scheme that each layer of the jelly-roll battery has the phenomenon of negative over positive, the positive jelly-roll and the negative jelly-roll in the utility model have high utilization rate, and the energy density of the Z type continuous folding battery can be improved.

[0044] Compared with the jelly-roll battery, since the Z type continuous folding battery adopts the Z type continuous folding technology, the size of each layer of jelly-roll is consistent, there is no problem of inner and outer rings in the jelly-roll battery, the deformation of the battery is low, and the yield rate and performance of the battery can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 It is a structure schematic view of the Z type continuous folding battery before shaping of the utility model;

[0046] Figure 2 It is a front view schematic view of the Z type continuous folding battery of the utility model;

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] 1, first positive jelly-roll; 2, diaphragm; 3, negative jelly-roll; 4, second positive jelly-roll; 5, adhesive tape; 6, positive lug; 7, negative lug. DETAILED DESCRIPTION

[0049] To solve the problems in the background art, the core inventive concept of the utility model is that the negative jelly-roll is replaced by the composite jelly-roll comprising the positive jelly-roll and the negative jelly-roll, so that the cutting frequency is further reduced, the probability of burr occurrence is reduced, the yield rate of the battery is improved, and the safety hidden trouble occurrence rate is reduced; at the bending part of the composite jelly-roll, the positive jelly-roll and the negative jelly-roll still face each other, so that the utilization rate of the positive jelly-roll and the negative jelly-roll can be improved, and the energy density of the battery can be improved; meanwhile, since the battery adopts the Z type continuous folding technology, the size of each layer of jelly-roll is consistent, there is no problem of inner and outer rings in the jelly-roll battery, the deformation of the battery is low, and the yield rate and performance of the battery can be effectively improved.

[0050] The utility model will be further described in detail in combination with embodiments.

[0051] The specific embodiment of the Z type continuous folding battery provided by the utility model is as follows:

[0052] As Figures 1-2As shown, the Z-type continuous folded cell includes a first electrode sheet that is folded back and forth in a "Z" shape. The first electrode sheet has at least two parallel first parts and a bent part connecting two adjacent first parts. A first positive electrode sheet 1 is provided between any two adjacent first parts. A diaphragm 2 is provided between the first positive electrode sheet 1 and the first electrode sheet. The first electrode sheet is a composite electrode sheet with continuous length. The first positive electrode sheet 1 is a single sheet with a set width.

[0053] In a first embodiment, the composite electrode includes a second positive electrode 4 of continuous length and two negative electrode 3 of continuous length, with the second positive electrode 4 disposed between the negative electrode 3.

[0054] In the second specific embodiment, the composite electrode includes n consecutive second positive electrode sheets 4 and n+1 consecutive negative electrode sheets 3, where n≥2, and each second positive electrode sheet 4 is disposed between two different negative electrode sheets 3. Here, n can be 2, 3, 4, or a larger value.

[0055] In the two specific embodiments described above, a separator 2 is provided between each second positive electrode 4 and the negative electrode 3.

[0056] In this invention, the first positive electrode 1 is a cut positive electrode (i.e., a single piece with a set width), and the second positive electrode 4 is an uncut positive electrode (i.e., a positive electrode with continuous length). Depending on the number of bends, the number of the first part can be two, three or more, and the corresponding number of the first positive electrode 1 can be one, two or more, which will not be elaborated here.

[0057] It should be noted that, as Figure 1 As shown, in the composite electrode, the negative electrode 3 is longer than the second positive electrode 4. This is to ensure the technical requirement that the negative electrode is always longer than the positive electrode (hereinafter referred to as negative super positive) and to ensure the safety of the battery cell. This is common knowledge to those skilled in the art and will not be elaborated here.

[0058] Since the first positive electrode 1 is positioned between two adjacent first portions, it ensures that the negative electrode 3 always exceeds the first positive electrode 1 (i.e., ensuring that the negative electrode exceeds the positive electrode). Simultaneously, for any positive electrode, both sides of that positive electrode are opposite to the negative electrode 3; for the outermost negative electrode 3, one side of the negative electrode 3 is directly opposite the first positive electrode 1, and the other side is directly opposite the second positive electrode 4; if there are also inner negative electrode 3s, then for the inner negative electrode 3, both sides of the negative electrode 3 are directly opposite different second positive electrode 4s. Therefore, in this invention, both sides of the positive and negative electrodes are fully utilized, resulting in high utilization rates and improving the energy density of the battery cell.

[0059] When the pole piece is folded, the positive pole ears 6 of all the positive pole pieces are arranged in a positive direction, and the negative pole ears 7 of all the negative pole pieces 3 are arranged in a negative direction, so as to facilitate further processing of the pole ears in the later stage; after the folding is completed, the stacked pole pieces are subjected to hot pressing, cold pressing shaping, and are fixed by the adhesive tape 5.

[0060] Compared with the prior art, in the utility model, the composite pole piece is folded along the "Z" type reciprocating, on the one hand, the second positive pole piece 4 in the composite pole piece is not cut, can effectively reduce the number of cutting, reduce the probability of burr occurrence, improve the yield of the battery cell, reduce the incidence of safety hazard, on the other hand, at the bending part of the composite pole piece, there is still a positive pole piece and a negative pole piece 3 in the positive direction, so the utilization rate of the positive and negative pole pieces can be improved, and the energy density of the battery cell can be improved.

[0061] In the non-Z type folded pole piece type battery cell, there are cutouts at the four edges of each cut-out pole piece (including positive pole pieces and negative pole pieces), in the utility model, the existence of the composite pole piece reduces the number of cutouts, which can reduce the probability of burr occurrence; at the same time, the composite pole piece includes continuous positive and negative pole pieces, and the composite pole piece only has a negative over positive phenomenon at the head and tail ends in the length direction, compared with the technical scheme that each layer of the pole piece type battery cell has a negative over positive phenomenon, the utilization rate of the positive and negative pole pieces in the utility model is high, which is conducive to improving the energy density of the Z type continuous folding battery cell.

[0062] Compared with the winding type battery cell, since the Z type continuous folding battery cell adopts the Z type continuous folding technology, the size of each layer of pole piece is consistent, there is no problem of inner and outer rings in the winding type battery cell, the deformation of the battery cell is low, which is conducive to improving the yield and performance of the battery cell.

[0063] In a specific embodiment, the separator 2 is stacked on both sides of the first pole piece, which is simple in structure.

[0064] In another specific embodiment, referring to the utility model patent with the authorization announcement number CN220233266U, the separator 2 is wrapped on the outer surface of the first positive pole piece 1, so that the separator 2 on the first positive pole piece 1 does not need to be folded, which can effectively avoid the folding of the separator 2.

[0065] In order for those skilled in the art to understand the Z type continuous folding battery cell in the utility model, the following gives a battery cell manufacturing method for manufacturing the Z type continuous folding battery cell:

[0066] The battery cell manufacturing method comprises a folding step for folding the first pole piece along the "Z" type reciprocating, in the folding step, the first positive pole piece 1 is loaded between two adjacent parallel first parts (one first positive pole piece 1 is loaded for each folding), and before the folding step, there is a stacking step, in the stacking step, the negative pole piece 3, the second positive pole piece 4 and the separator 2 are stacked together to form the first pole piece.

[0067] When the number of the second positive electrode sheet 4 is one, the number of the negative electrode sheet 3 is two, and the second positive electrode sheet 4 is located between the two negative electrode sheets 3 during the stacking process. When the number of the second positive electrode sheet 4 is n, n≥2, the number of the negative electrode sheet 3 is n+1, and each of the second positive electrode sheets 4 is located between two different negative electrode sheets 3 during the stacking process. The value of n can be 2, 3, 4, or a larger number.

[0068] After the folding step, the folded electrode sheet needs to be hot-pressed, cold-pressed, shaped, and fixed with adhesive tape.

[0069] In one manufacturing method, a film wrapping step is further included before the folding step. In the film wrapping step, the separator 2 is wrapped on the outer surface of the first positive electrode sheet 1. At this time, the separator 2 on the first positive electrode sheet 1 does not need to be folded in the folding step, which can effectively avoid the folding of the separator 2.

[0070] In another manufacturing method, the separator 2 is stacked on both sides of the first electrode sheet in the stacking step. The film wrapping step can be synchronized with the stacking step, which is beneficial to improve the production efficiency.

[0071] The stacked positive and negative electrode sheets and the separator 2 need to ensure that the height and length (dimensions including height, length, and thickness) of the separator 2 is greater than that of the negative electrode sheet 3, and the length and height of the second positive electrode sheet 4 is less than that of the negative electrode sheet 3, so as to ensure that the negative electrode sheet 3 is longer than the second positive electrode sheet 4. The width (dimensions including width, height, and thickness) of the first positive electrode sheet 1 is less than the width (dimensions including width, height, and thickness) of the negative electrode sheet 3 corresponding to the first part, so as to ensure that the negative electrode sheet 3 is wider than the first positive electrode sheet 1.

[0072] At the same time, during the stacking process, the positive and negative electrode sheets are separated by the separator 2, and the outermost layer is the separator 2 and the next outer layer is the negative electrode sheet 3, so that both sides of the positive and negative electrode sheets are fully utilized.

[0073] When the above technical requirements are met, it can be ensured that the negative electrode sheet 3 is longer than the second positive electrode sheet 4, and the separator is provided between the negative electrode sheet 3 and the positive electrode sheet.

[0074] Preferably, in one specific embodiment, the length and height of all negative electrode sheets 3 are the same, which is simple in structure and has a high utilization rate of positive and negative electrode sheets.

[0075] However, in other specific embodiments, the length and height of the negative electrode sheet 3 can be different. At this time, the height and length of the second positive electrode sheet 4 are less than the minimum length and minimum height of the negative electrode sheet 3, respectively, so as to ensure that the negative electrode sheet 3 is longer than the second positive electrode sheet 4.

[0076] Preferably, in one specific embodiment, the height of the inserted first positive electrode sheet 1 is consistent with the height of the stacked second positive electrode sheet 4, which has a high utilization rate of positive and negative electrode sheets.

[0077] But in other embodiments, the height of the first positive plate 1 can also be greater than the height of the second positive plate 4, or the height of the first positive plate 1 can also be less than the height of the second positive plate 4, as long as the negative over positive technical requirement is met, and the smaller the height difference between the first positive plate 1 and the second positive plate 4, the higher the utilization rate of the positive and negative plates.

[0078] Referring to Figure 1 In an embodiment, one end of the first positive plate 1 is inserted into the bending portion to further increase the utilization rate of the positive and negative plates.

[0079] Preferably, the width of the first positive plate 1 is greater than the width of the first portion to further increase the utilization rate of the positive and negative plates.

[0080] It should be noted that: Figure 1 The first portion has a larger width and the bending portion has a smaller size after the Z-shaped continuously folded battery cell is shaped by hot pressing and cold pressing.

[0081] In other embodiments, in the thickness direction, the projection of the first positive plate 1 on the negative plate 3 falls completely within the corresponding area of the negative plate 3 and the first portion, that is, the first positive plate 1 is not inserted into the bending portion, at this time, it can avoid the first positive plate 1 from extruding the separator 2 at the bending portion and avoid damaging the separator 2.

[0082] In other embodiments, when one end of the first positive plate 1 is inserted into the bending portion, the width of the first positive plate 1 is less than the width of the first portion to better ensure the negative over positive.

[0083] Of course, when one end of the first positive plate 1 is inserted into the bending portion, the end of the first positive plate 1 inserted into the bending portion can also be polished to be smooth to avoid damaging the separator 2.

[0084] Preferably, in an embodiment, when the number of the second positive plate 4 is greater than two, the height and width of all the second positive plates 4 are the same, the structure is simple, and the utilization rate of the positive and negative plates is high.

[0085] But in other embodiments, the height and width of different second positive plates 4 can also be different, at this time, the height and width of the negative plate 3 need to be greater than the maximum height and the maximum width of the second positive plate 4 to ensure the negative over positive.

[0086] The specific embodiments of the battery provided by the utility model:

[0087] The battery includes a battery cell, and the battery cell is any one of the battery cells in the specific embodiments of the battery cell, which will not be described here.

[0088] The specific embodiment of the electric equipment provided by the utility model:

[0089] The electric equipment comprises a battery, and the battery is the battery in the specific embodiment of the utility model battery, which will not be described herein.

[0090] Finally, it needs to be pointed out that the above-mentioned is only the preferred embodiment of the utility model, and is not used for limiting the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment without paying the creative labor, or equivalent replacement is carried out to part of technical features, thereby combining the specific embodiment given in the attached Figures 1-2 of course, the person skilled in the art can also combine the specific embodiments not given in the remaining description drawings. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A Z-shaped continuously folded battery cell comprising a first electrode sheet folded in a "Z" shape, the first electrode sheet having at least two parallel first portions and a bent portion connecting adjacent two of the first portions, a first positive electrode sheet being provided between any adjacent two of the first portions, and a separator being provided between the first positive electrode sheet and the first electrode sheet, characterized in that, The first electrode sheet is a composite electrode sheet, and the composite electrode sheet comprises one second positive electrode sheet and two negative electrode sheets, or the composite electrode sheet comprises n second positive electrode sheets and n+1 negative electrode sheets, n≥2, and each second positive electrode sheet is arranged between different two negative electrode sheets; a separator is arranged between each second positive electrode sheet and the negative electrode sheet.

2. The Z-shaped continuously folded battery cell of claim 1, wherein, The separators are stacked on both sides of the first electrode sheet.

3. The Z-shaped continuously folded battery cell of claim 2, wherein, The length and height of all the negative electrode sheets are the same, the height of the separator is greater than the height of the negative electrode sheet, and the length of the separator is greater than the length of the negative electrode sheet.

4. The Z-folded battery cell of any one of claims 1-3, wherein, The length and height of all the negative electrode sheets are the same, and the length of the negative electrode sheet is greater than the length of the second positive electrode sheet, and the width of the negative electrode sheet is greater than the width of the second positive electrode sheet.

5. The Z-folded battery cell of any one of claims 1-3, wherein, The height of the first positive electrode sheet is equal to the height of the second positive electrode sheet.

6. The Z-shaped continuously folded electric core of claim 1 or 2, wherein, One end of the first positive electrode sheet is inserted into the bent part.

7. The Z-shaped continuously folded battery cell of claim 6, wherein, The width of the first positive electrode sheet is greater than the width of the first part.

8. The Z-folded battery cell of any one of claims 1-3, wherein, When the number of the second positive electrode sheets is greater than two, the height and width of all the second positive electrode sheets are the same.

9. A battery comprising a cell, characterized by The battery cell is the Z-shaped continuous folding battery cell of any one of claims 1-8.

10. An electrical device comprising a battery, characterized in that The battery is the battery of claim 9.

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