Battery cell, battery monomer, battery pack and power utilization device

Abstract

The invention provides a battery cell, a battery monomer, a battery pack and a power utilization device, and relates to the technical field of batteries. The battery cell comprises a plurality of pole pieces and a diaphragm; the plurality of pole pieces are laminated along the thickness direction of the battery cell; the polarities of two adjacent pole pieces are opposite; the diaphragm is arranged between two adjacent pole pieces; the pole piece comprises at least two sub pole pieces, and the at least two sub pole pieces are separately arranged along a first direction; the first direction intersects with the thickness direction of the battery cell. According to the present invention, the sub-pole pieces are separately arranged so as to reduce the length of the whole pole piece, reduce the deflection of the pole piece, reduce the bending deformation of the pole piece, and improve the flatness of the pole piece, such that the thickness distribution of the battery cell is uniform, the production efficiency and the yield of the battery cell are improved, and the current density, the potential and the like of the middle region of the battery cell along the first direction can be reduced; therefore, the current density, potential and the like of the battery cell along the first direction are uniformly distributed, lithium precipitation of the battery cell is prevented, the performance and safety of the battery cell are improved, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery cell, a battery pack, and an electrical device. Background Art

[0002] With the development of battery technology and the continuous changes in battery application scenarios, the capacity of batteries is getting higher and higher.

[0003] In the related art, a battery includes a cell having a positive electrode sheet and a negative electrode sheet. The energy density of the cell can be increased by increasing the length of the positive electrode sheet and the negative electrode sheet, thereby obtaining a battery with high capacitance.

[0004] However, as the length of the positive and negative electrodes increases, the current density, potential, etc. on the positive and negative electrodes become unevenly distributed, resulting in poor battery performance and even lithium deposition. Summary of the Invention

[0005] The present application provides a battery cell, a battery cell, a battery pack and an electrical device, which improve the uniformity of the distribution of current density, potential, etc. on the positive and negative electrode sheets, thereby improving the performance of the battery and preventing lithium plating.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a battery cell, comprising:

[0008] A plurality of pole pieces, wherein the plurality of pole pieces are stacked along the thickness direction of the battery core; the polarities of two adjacent pole pieces are opposite;

[0009] a diaphragm, the diaphragm being arranged between two adjacent pole pieces;

[0010] At least one of the pole pieces includes at least two sub-pole pieces, and the at least two sub-pole pieces are separately arranged along a first direction; the first direction intersects with the thickness direction of the battery cell.

[0011] As an optional implementation, at least two of the sub-pole pieces are spaced apart along the first direction.

[0012] As an optional implementation, the first direction is along the length direction of the battery core.

[0013] As an optional embodiment, the electrode sheet includes a positive electrode sheet; the positive electrode sheet includes a first sub-electrode sheet and a second sub-electrode sheet, and the first sub-electrode sheet and the second sub-electrode sheet are separately arranged along the first direction.

[0014] As an optional implementation, a first spacing region is provided between the first sub-pole piece and the second sub-pole piece.

[0015] As an optional embodiment, the electrode sheet further includes a negative electrode sheet; the positive electrode sheet and the negative electrode sheet are both multiple, and the negative electrode sheets and the positive electrode sheets are alternated in sequence along the thickness direction of the battery cell;

[0016] Along the thickness direction of the battery core, the first spacing areas at least partially intersect with each other.

[0017] As an optional embodiment, the electrode sheet further includes a negative electrode sheet; the positive electrode sheet and the negative electrode sheet are both multiple, and the negative electrode sheets and the positive electrode sheets are alternated in sequence along the thickness direction of the battery cell;

[0018] The first spacing areas are spaced apart along the first direction.

[0019] As an optional implementation manner, along the thickness direction of the battery cell, the first sub-pole sheets are arranged opposite to each other, and the second sub-pole sheets are arranged opposite to each other.

[0020] As an optional implementation manner, along the first direction, the extension lengths of the first sub-pole pieces are the same;

[0021] And / or, along the first direction, the extension lengths of the second sub-pole pieces are the same.

[0022] As an optional implementation manner, along the first direction, the extension length of the first sub-pole piece is equal to the extension length of the second sub-pole piece;

[0023] and / or, along the second direction, the extension length of the first sub-pole piece is equal to the extension length of the second sub-pole piece;

[0024] The first direction, the second direction, and the thickness direction of the battery cell are perpendicular to each other.

[0025] As an optional embodiment, along the first direction, there is a spacing between the first sub-pole sheet and the second sub-pole sheet, the spacing is L1, and the extension length of the positive electrode sheet is L2, wherein L1 / L2=Q3, and Q3 satisfies: 0.001≤Q3≤0.01.

[0026] As an optional embodiment, along the first direction, the extension length of the negative electrode sheet is L4, and the extension length of the positive electrode sheet is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01;

[0027] And / or, along the second direction, the extension length of the negative electrode sheet (120) is L5, and the extension length of the positive electrode sheet is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.01.

[0028] As an optional embodiment, the electrode sheet includes a negative electrode sheet;

[0029] The negative electrode sheet includes a third sub-electrode sheet and a fourth sub-electrode sheet, and the third sub-electrode sheet and the fourth sub-electrode sheet are separately arranged along the first direction.

[0030] As an optional implementation, a second spacing region is provided between the third sub-pole piece and the fourth sub-pole piece.

[0031] As an optional embodiment, the electrode sheet further includes a positive electrode sheet, and there are multiple positive electrode sheets and multiple negative electrode sheets, and the negative electrode sheets and the positive electrode sheets are alternated in sequence along the thickness direction of the battery cell;

[0032] Along the thickness direction of the battery core, the second spacing regions at least partially intersect with each other.

[0033] As an optional embodiment, the electrode sheet further includes a positive electrode sheet, and there are multiple positive electrode sheets and multiple negative electrode sheets, and the negative electrode sheets and the positive electrode sheets are alternated in sequence along the thickness direction of the battery cell;

[0034] The second spacing areas are spaced apart along the first direction.

[0035] As an optional implementation manner, along the thickness direction of the battery core, the third sub-pole pieces are arranged opposite to each other, and the fourth sub-pole pieces are arranged opposite to each other.

[0036] As an optional implementation manner, along the first direction, the extension lengths of the third sub-pole pieces are the same;

[0037] And / or, along the first direction, the extension lengths of the fourth sub-pole pieces are the same.

[0038] As an optional implementation manner, along the first direction, the extension length of the third sub-pole piece is equal to the extension length of the fourth sub-pole piece;

[0039] And / or, along the second direction, the extension length of the third sub-pole piece is equal to the extension length of the fourth sub-pole piece.

[0040] As an optional embodiment, along the first direction, there is a spacing between the third sub-pole sheet and the fourth sub-pole sheet, the spacing is L3, and the extension length of the negative electrode sheet is L4, wherein L3 / L4=Q4, and Q4 satisfies: 0.001≤Q4≤0.01.

[0041] As an optional embodiment, along the first direction, the extension length of the negative electrode sheet is L4, and the extension length of the positive electrode sheet is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01;

[0042] And / or, along the second direction, the extension length of the negative electrode sheet is L5, and the extension length of the positive electrode sheet is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.01.

[0043] As an optional embodiment, the adjacent electrode pieces include a positive electrode piece and a negative electrode piece, the positive electrode piece includes a first sub-electrode piece and a second sub-electrode piece, and the first sub-electrode piece and the second sub-electrode piece are separately arranged along the first direction;

[0044] The negative electrode sheet includes a third sub-electrode sheet and a fourth sub-electrode sheet, and the third sub-electrode sheet and the fourth sub-electrode sheet are separately arranged along the first direction.

[0045] As an optional implementation manner, a first spacing region is provided between the first sub-pole piece and the second sub-pole piece;

[0046] And / or, a second spacing region is provided between the third sub-pole piece and the fourth sub-pole piece.

[0047] As an optional embodiment, there are multiple positive electrode sheets and multiple negative electrode sheets, and the negative electrode sheets and the positive electrode sheets are alternated in the thickness direction of the battery cell;

[0048] Along the thickness direction of the battery core, the first spacing areas at least partially intersect with each other;

[0049] And / or, along the thickness direction of the battery core, the second spacing regions at least partially intersect with each other.

[0050] As an optional implementation manner, along the first direction, the first spacing areas are arranged at intervals;

[0051] And / or, along the first direction, the second spacer is spaced apart.

[0052] As an optional implementation manner, along the thickness direction of the battery core, each of the first spacing areas and each of the second spacing areas are arranged opposite to each other.

[0053] As an optional implementation, along the thickness direction of the battery cell, the first sub-pole piece and the third sub-pole piece are arranged opposite to each other, and the second sub-pole piece and the fourth sub-pole piece are arranged opposite to each other.

[0054] As an optional embodiment, along the first direction, the extension length of the first sub-pole piece is equal to the extension length of the second sub-pole piece, and the extension length of the third sub-pole piece is equal to the extension length of the fourth sub-pole piece;

[0055] And / or, along the second direction, the extension length of the first sub-pole piece is equal to the extension length of the second sub-pole piece, and the extension length of the third sub-pole piece is equal to the extension length of the fourth sub-pole piece.

[0056] As an optional implementation, the extension length of the third sub-pole piece is W1, and the extension length of the first sub-pole piece is W2, wherein W1 / W2=Q1, and Q1 satisfies: 1.001≤Q1≤1.01;

[0057] And / or, along the second direction, the extension length of the third sub-pole piece is W3, and the extension length of the first sub-pole piece is W4, wherein W3 / W4=Q2, and Q2 satisfies: 1.001≤Q2≤1.01.

[0058] As an optional embodiment, along the first direction, there is a distance between the first sub-pole sheet and the second sub-pole sheet, the distance is L1, and the extension length of the positive electrode sheet is L2, wherein L1 / L2=Q3, and Q3 satisfies: 0.001≤Q3≤0.01;

[0059] And / or, along the first direction, there is a distance between the third sub-pole sheet and the fourth sub-pole sheet, the distance is L3, and the extension length of the negative electrode sheet is L4, wherein L3 / L4=Q4, and Q4 satisfies: 0.001≤Q4≤0.01.

[0060] As an optional embodiment, along the first direction, the extension length of the negative electrode sheet is L4, and the extension length of the positive electrode sheet is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01;

[0061] And / or, along the second direction, the extension length of the negative electrode sheet is L5, and the extension length of the positive electrode sheet is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.01.

[0062] As an optional embodiment, each of the pole pieces is provided with a pole lug, and the pole lug protrudes from a side edge of the pole piece.

[0063] As an optional embodiment, the number of the pole lugs on each pole piece is at least two, and the at least two pole lugs are respectively arranged on two opposite sides of the pole piece along the first direction.

[0064] As an optional implementation, the pole tabs on adjacent pole pieces are staggered along the second direction.

[0065] As an optional embodiment, the adjacent electrode sheets include a positive electrode sheet and a negative electrode sheet, the positive electrode sheet is provided with a first positive electrode tab and a second positive electrode tab, and along the first direction, the first positive electrode tab and the second positive electrode tab are located at opposite ends of the positive electrode sheet;

[0066] And / or, a first negative electrode tab and a second negative electrode tab are provided on the negative electrode sheet, and along the first direction, the first negative electrode tab and the second negative electrode tab are located at two opposite ends of the negative electrode sheet.

[0067] As an optional embodiment, in the positive electrode sheet, along the second direction, the first positive electrode tab and the second positive electrode tab are staggered;

[0068] And / or, in the negative electrode sheet, along the second direction, the first negative electrode tab and the second negative electrode tab are staggered.

[0069] As an optional embodiment, there are multiple first positive electrode tabs, and the multiple first positive electrode tabs are arranged at intervals along the second direction;

[0070] And / or, there are multiple second positive electrode tabs, and the multiple second positive electrode tabs are arranged at intervals along the second direction;

[0071] And / or, there are multiple first negative electrode tabs, and the multiple first negative electrode tabs are arranged at intervals along the second direction;

[0072] And / or, there are multiple second negative electrode tabs, and the multiple second negative electrode tabs are arranged at intervals along the second direction.

[0073] As an optional implementation, the pole tab is provided at at least one end of the pole piece along the second direction.

[0074] As an optional implementation, the pole tabs on adjacent pole pieces are staggered along the first direction.

[0075] As an optional embodiment, the adjacent electrode sheets include a positive electrode sheet and a negative electrode sheet, the positive electrode sheet is provided with a first positive electrode tab and a second positive electrode tab, and along the second direction, the first positive electrode tab and the second positive electrode tab are located on the same side of the positive electrode sheet;

[0076] And / or, a first negative electrode tab and a second negative electrode tab are provided on the negative electrode sheet, and along the second direction, the first negative electrode tab and the second negative electrode tab are located on the same side of the negative electrode sheet.

[0077] As an optional embodiment, there are multiple first positive electrode tabs, and the multiple first positive electrode tabs are arranged at intervals along the first direction;

[0078] And / or, there are multiple second positive electrode tabs, and the multiple second positive electrode tabs are arranged at intervals along the first direction;

[0079] And / or, there are multiple first negative electrode tabs, and the multiple first negative electrode tabs are arranged at intervals along the first direction;

[0080] And / or, there are multiple second negative electrode tabs, and the multiple second negative electrode tabs are arranged at intervals along the first direction.

[0081] In a second aspect, the present application provides a battery cell, comprising: a shell and the battery cell provided in the first aspect; the shell has a receiving cavity; and the battery cell is disposed in the receiving cavity.

[0082] As an optional implementation, a pole is provided on the shell, and the battery cell is electrically connected to the pole.

[0083] In a third aspect, the present application provides a battery pack comprising the battery cell provided in the second aspect.

[0084] In a fourth aspect, the present application provides an electrical device comprising the battery cell provided in the second aspect; or the battery pack provided in the third aspect.

[0085] The present application provides a battery cell, a battery cell, a battery pack, and an electrical device. The battery cell includes: a plurality of pole pieces and a diaphragm; the plurality of pole pieces are stacked along the thickness direction of the battery cell; the polarities of two adjacent pole pieces are opposite; the diaphragm is disposed between two adjacent pole pieces; the pole piece includes at least two sub-pole pieces, and at least two sub-pole pieces are discretely disposed along a first direction; the first direction intersects with the thickness direction of the battery cell. The present application uses discretely disposed sub-pole pieces to reduce the current density, potential, etc. in the central region of the battery cell along the first direction, so that the current density and potential of the battery cell along the first direction are uniformly distributed, thereby preventing lithium deposition in the battery cell, improving the performance and safety of the battery cell, and extending the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0087] Figure 1 A schematic diagram of the first battery cell provided in an embodiment of the present application;

[0088] Figure 2 A schematic diagram of a second battery cell provided in an embodiment of the present application;

[0089] Figure 3 A schematic diagram of a third type of battery cell provided in an embodiment of the present application;

[0090] Figure 4 A schematic diagram of the first positive electrode sheet in the battery cell provided in an embodiment of the present application;

[0091] Figure 5 A schematic diagram of the first negative electrode sheet in the battery cell provided in an embodiment of the present application;

[0092] Figure 6 A schematic diagram of the second type of positive electrode sheet in the battery cell provided in an embodiment of the present application;

[0093] Figure 7 A schematic diagram of the second negative electrode sheet in the battery cell provided in an embodiment of the present application;

[0094] Figure 8 A schematic diagram of the third type of positive electrode sheet in the battery cell provided in an embodiment of the present application;

[0095] Figure 9 A schematic diagram of the third type of negative electrode sheet in the battery cell provided in an embodiment of the present application;

[0096] Figure 10 A schematic diagram of the fourth type of positive electrode sheet in the battery cell provided in an embodiment of the present application;

[0097] Figure 11 A schematic diagram of the fourth type of negative electrode sheet in the battery cell provided in an embodiment of the present application;

[0098] Figure 12 A schematic diagram of a battery cell provided in an embodiment of the present application;

[0099] Figure 13 A side view of a battery cell provided in an embodiment of the present application.

[0100] Description of reference numerals:

[0101] 100-battery cells;

[0102] 110 - positive electrode sheet; 111 - first sub-electrode sheet; 112 - second sub-electrode sheet; 113 - first spacer; 114 - first positive electrode tab; 115 - second positive electrode tab; 116 - positive electrode current collector; 117 - positive electrode active material layer;

[0103] 120 - negative electrode sheet; 121 - third sub-electrode sheet; 122 - fourth sub-electrode sheet; 123 - second spacer; 124 - first negative electrode tab; 125 - second negative electrode tab; 126 - negative electrode current collector; 127 - negative electrode active material layer;

[0104] 130-diaphragm;

[0105] 200 - battery cell; 210 - housing; 220 - terminal. DETAILED DESCRIPTION

[0106] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0107] First, see Figure 1 、 Figure 2 and Figure 3 , define the thickness direction of the battery cell 100 as Z.

[0108] It should be noted that the first direction in the embodiment of the present application intersects with the thickness direction (Z) of the battery cell 100. It is not difficult to understand that the first direction can be along the length direction of the electrode piece or the width direction of the electrode piece. The embodiment of the present application takes the first direction along the length direction of the electrode piece as an example for explanation. Figure 1 、 Figure 2 and Figure 3 , define the first direction as X.

[0109] It should also be noted that the first direction (X), the second direction, and the thickness direction (Z) of the battery cell 100 in the embodiment of the present application are perpendicular to each other. The first direction (X) is along the length direction of the battery cell 100, and the second direction is along the width direction of the battery cell 100. Alternatively, the first direction (X) is along the width direction of the battery cell 100, and the second direction is along the length direction of the battery cell 100. The embodiment of the present application takes the first direction (X) along the length direction of the battery cell 100 and the second direction along the width direction of the battery cell 100 as an example to illustrate the content of the present application. Therefore, refer to Figures 4 to 8 , define the second direction as Y.

[0110] In a first aspect, embodiments of the present application provide a battery cell 100 comprising a separator 130 and a plurality of electrode sheets. The plurality of electrode sheets are stacked along the thickness direction (Z) of the battery cell 100; adjacent electrode sheets have opposite polarities; and the separator 130 is disposed between adjacent electrode sheets.

[0111] In some embodiments, the electrode sheet extends along a first direction (X). As the length of the electrode sheet along the first direction (X) increases, the structural dimensions of the electrode sheet increase, and the area of ​​the electrode sheet also increases. This, in turn, can increase the energy density of the battery cell 100 and the capacity of the battery cell 200. However, during assembly of such a battery cell 100, due to the relatively thin and long electrode sheet, the electrode sheet has a large deflection and is prone to bending. This can result in uneven thickness distribution of the battery cell 100 after the electrode sheet and separator 130 are stacked, and the battery cell 100 is prone to wrinkling, which negatively impacts the productivity of the battery cell 100. Furthermore, during the use of such a battery cell 100, due to the relatively large length of the electrode, the current density, potential and charging state of the electrode along the first direction (X) will form a distribution in which the middle area is relatively large and the end area is relatively small. That is to say, the current density, potential and charging state of the battery cell 100 are unevenly distributed. As such unevenness increases and strengthens, the performance of the battery cell 200, the life of the battery cell 200 and the safety of the battery cell 200 will deteriorate, and in severe cases, lithium plating may even occur.

[0112] In order to solve the above problem, the pole piece in the embodiment of the present application includes at least two sub-pole pieces, and the at least two sub-pole pieces are separately arranged along the first direction (X).

[0113] In some embodiments, one of the plurality of electrode sheets may include at least two sub-electrode sheets, or multiple electrode sheets in the plurality of electrode sheets may include at least two sub-electrode sheets. The plurality of electrode sheets including sub-electrode sheets may include only the positive electrode sheet 110, only the negative electrode sheet 120, or both the positive electrode sheet 110 and the negative electrode sheet 120. The number of positive electrode sheets 110 and / or negative electrode sheets 120 including sub-electrode sheets is not specifically required in the present embodiment.

[0114] It is not difficult to understand that the number of sub-pole pieces of the same pole piece in the embodiment of the present application can be two, and the two sub-pole pieces are separately arranged along the first direction (X), that is, the two sub-pole pieces are independent of each other, and there is no mechanical connection or electrical connection between the two sub-pole pieces.

[0115] For example, the two sub-pole sheets may be arranged adjacent to each other, partially stacked, or spaced apart, etc., and no specific requirements are made for this.

[0116] In some embodiments, the number of sub-pole pieces in the same pole piece can be three or more, and the three or more sub-pole pieces are independent of each other. Along the first direction (X), the sub-pole pieces can be arranged in a manner of being adjacent, spaced apart, or a combination of adjacent and spaced apart. It should be noted that the embodiments of the present application do not make specific requirements on the number of sub-pole pieces in the same pole piece and the arrangement of the sub-pole pieces.

[0117] In this way, the discrete sub-electrode sheets are used to reduce the current density, potential, and other characteristics in the central region of the battery cell 100 along the first direction (X), thereby achieving a uniform distribution of the current density and potential along the first direction (X) of the battery cell 100. This prevents lithium deposition in the battery cell 100, improves the performance and safety of the battery cell 100, and extends the service life of the battery cell 100. Furthermore, the discrete sub-electrode sheets along the first direction (X) reduce the length of the entire electrode sheet, reduce its deflection, and minimize bending deformation, thereby improving the flatness of the electrode sheet and achieving a uniform thickness distribution of the battery cell 100, thereby improving the production efficiency and yield rate of the battery cell 100.

[0118] In some embodiments, at least two sub-electrode sheets are spaced apart along the first direction (X). It is understood that a blank space exists between the spaced sub-electrode sheets, where at least one of the positive electrode sheet 110 and the negative electrode sheet 120 lacks the corresponding positive electrode active material layer 117 and the corresponding negative electrode active material layer 127. This reduces the lithium ion concentration in the central region of the battery cell 100 along the first direction (X), thereby preventing lithium deposition within the battery cell 100 and extending the service life of the battery cell 100 as well as the energy efficiency and safety of the battery cell 100.

[0119] In the embodiment of the present application, the electrode sheet includes a positive electrode sheet 110, and the positive electrode sheet 110 includes at least two sub-electrode sheets. Figure 1 , the assembly structure of the positive electrode sheet 110 in the battery cell 100 provided in the present application, including at least two sub-electrode sheets, is described.

[0120] It should be noted that in the embodiment of the present application, one of the plurality of electrode sheets 110 includes at least two sub-electrode sheets, or each of the plurality of positive electrode sheets 110 includes at least two sub-electrode sheets. This embodiment of the present application does not specifically require this. In addition, the negative electrode sheet 120 in the embodiment of the present application does not include any sub-electrode sheets.

[0121] See Figure 1 In some embodiments, the positive electrode sheet 110 includes a first sub-electrode sheet 111 and a second sub-electrode sheet 112 , and the first sub-electrode sheet 111 and the second sub-electrode sheet 112 are separately arranged along the first direction (X).

[0122] It will be understood that when the first and second sub-electrode sheets 111, 112 are separately provided, they are independent of each other and can be arranged adjacent to each other or spaced apart, with no specific requirements. The arrangement of the first and second sub-electrode sheets 111, 112 ensures the energy density of the battery cell 100 while meeting the required extension length of the positive electrode sheet 110 along the first direction (X). Compared to a single positive electrode sheet 110, the arrangement of the first and second sub-electrode sheets 111, 112 reduces the length of the entire positive electrode sheet 110, thereby reducing the deflection of the positive electrode sheet 110. In other words, the bending deformation of the positive electrode sheet 110 is reduced, thereby ensuring the flatness of the battery cell 100 and achieving a uniform thickness distribution within the battery cell 100, further improving the production efficiency and yield rate of the battery cell 100 and the battery.

[0123] Furthermore, since the first sub-electrode sheet 111 and the second sub-electrode sheet 112 are separately arranged, there is no mechanical connection relationship and electrical connection relationship between the first sub-electrode sheet 111 and the second sub-electrode sheet 112. The first sub-electrode sheet 111 and the second sub-electrode sheet 112 work independently. Compared with the structural setting of the entire positive electrode sheet 110, the uniformity of the current density and potential of the positive electrode sheet 110 along the first direction (X) can be improved, and the uniformity of the current density and potential of the battery cell 100 along the first direction (X) can be ensured, thereby improving the performance of the battery cell 100, extending the service life of the battery cell 100, and avoiding lithium deposition of the battery cell 100.

[0124] In some embodiments, the first sub-electrode sheet 111 and the second sub-electrode sheet 112 are spaced apart along a first direction (X), with a first spacer 113 defined between the first sub-electrode sheet 111 and the second sub-electrode sheet 112. Within the first spacer 113, the positive electrode sheet 110 does not have a positive electrode active material layer 117. During operation of the positive electrode sheet 110, the lithium ion concentration in the first spacer 113 decreases, thereby preventing lithium deposition in the battery cell 100 due to high current density within the first spacer 113. This improves the performance and safety of the battery cell 100 and further extends the service life of the battery cell 100.

[0125] It should be noted that, in some embodiments, there can be multiple first sub-pole pieces 111 and second sub-pole pieces 112, and the first sub-pole pieces 111 and second sub-pole pieces 112 are alternately and spaced apart in sequence along the first direction (X). The embodiment of the present application does not require the number of the first sub-pole pieces 111 and the second sub-pole pieces 112.

[0126] It is understood that the electrode sheets also include a negative electrode sheet 120. In the embodiment of the present application, there are multiple positive electrode sheets 110 and multiple negative electrode sheets 120, and the negative electrode sheets 120 and the positive electrode sheets 110 alternate along the thickness direction (Z) of the battery cell 100. Along the thickness direction (Z) of the battery cell 100, the first spacers 113 at least partially intersect.

[0127] Exemplarily, an angle may be formed between the extension direction of the center lines of some or all of the first spacers 113 and the first direction, so that the first spacers 113 intersect with each other.

[0128] In one embodiment, center lines of some or all of the first spacers 113 coincide with each other along the thickness direction (Z) of the battery cell 100 , such that the first spacers 113 are at least partially opposite to each other.

[0129] In this way, through such an arrangement, the positions of the first spacers 113 are different, so as to disperse the length distribution of the positive electrode sheet 110 along the first direction (X), thereby reducing the deflection of the positive electrode sheet 110 and further improving the uniformity of the thickness distribution of the battery cell 100, thereby improving the flatness of the battery cell 100 and facilitating the assembly and production of the battery cell 100.

[0130] In some embodiments, the first spacers 113 may be positioned relative to each other along the thickness direction (Z) of the battery cell 100. That is, the centerlines of the first spacers 113 of each positive electrode sheet 110 along the thickness direction (Z) of the battery cell 100 overlap, and the first spacers 113 extend along the first direction (X) to the same length. During assembly of the battery cell 100, this relative positioning of the first spacers 113 of each positive electrode sheet 110 facilitates the positioning of the first and second sub-electrode sheets 111 and 112, thereby improving assembly efficiency of the battery cell 100.

[0131] In some embodiments, the first spacers 113 may be spaced apart along the first direction (X), that is, two adjacent or spaced first spacers 113 may have a distance along the first direction (X).

[0132] As an optional embodiment, along the thickness direction (Z) of the battery cell 100, the first sub-electrode sheets 111 are arranged opposite each other, and the second sub-electrode sheets 112 are arranged opposite each other. In this way, the positions of all the first sub-electrode sheets 111 and the relative positions of all the second sub-electrode sheets 112 are fixed, facilitating the automated assembly of the battery cell 100 and improving the production efficiency of the battery cell 100.

[0133] In the embodiment of the present application, along the first direction (X), the extension lengths of the first sub-pole pieces 111 are the same. Alternatively, along the first direction (X), the extension lengths of the second sub-pole pieces 112 are the same. In this way, by making the first sub-pole pieces 111 and the second sub-pole pieces 112 extend differently along the first direction (X), the position of the first spacer 113 along the first direction (X) can be adjusted.

[0134] In some embodiments, along the first direction (X), the extension lengths of the first sub-electrode sheets 111 are the same, and the extension lengths of the second sub-electrode sheets 112 are the same. In this way, the first spacers 113 of the positive electrode sheets 110 are aligned with each other along the thickness direction (Z) of the battery cell 100 .

[0135] As an optional embodiment, along the first direction (X), the extension length of the first sub-pole piece 111 is equal to the extension length of the second sub-pole piece 112. Alternatively, along the second direction (Y), the extension length of the first sub-pole piece 111 is equal to the extension length of the second sub-pole piece 112.

[0136] In some embodiments, along the first direction (X), the extension length of the first sub-pole piece 111 is equal to the extension length of the second sub-pole piece 112 , and along the second direction (Y), the extension length of the first sub-pole piece 111 is equal to the extension length of the second sub-pole piece 112 .

[0137] In the embodiment of the present application, the electrode sheet includes a negative electrode sheet 120, and the negative electrode sheet 120 includes at least two sub-electrode sheets. Figure 2 , the assembly structure of the negative electrode sheet 120 in the battery cell 100 provided in the present application, including at least two sub-electrode sheets, is described.

[0138] It should be noted that in the embodiment of the present application, one negative electrode sheet 120 among the multiple electrode sheets includes at least two sub-electrode sheets, or multiple negative electrode sheets 120 among the multiple electrode sheets each include at least two sub-electrode sheets. This embodiment of the present application does not specifically require this. In addition, the positive electrode sheet 110 in the embodiment of the present application does not include any sub-electrode sheets.

[0139] In some embodiments, the negative electrode sheet 120 includes a third sub-electrode sheet 121 and a fourth sub-electrode sheet 122 , and the third sub-electrode sheet 121 and the fourth sub-electrode sheet 122 are separately disposed along the first direction (X).

[0140] It will be understood that when the third and fourth sub-electrode sheets 121 and 122 are separately provided, they are independent of each other and can be arranged adjacent to each other or spaced apart, with no specific requirements. The arrangement of the third and fourth sub-electrode sheets 121 and 122 ensures the energy density of the battery cell 100 while meeting the required extension length of the negative electrode sheet 120 along the first direction (X). Compared to a single negative electrode sheet 120, the arrangement of the third and fourth sub-electrode sheets 121 and 122 reduces the length of the entire negative electrode sheet 120, thereby reducing its deflection. In other words, the bending deformation of the negative electrode sheet 120 is reduced, thereby ensuring the flatness of the battery cell 100 and achieving a uniform thickness distribution within the battery cell 100, further improving the production efficiency and yield rate of the battery cell 100 and the battery.

[0141] Furthermore, since the third sub-pole sheet 121 and the fourth sub-pole sheet 122 are separately arranged, there is no mechanical connection relationship and electrical connection relationship between the third sub-pole sheet 121 and the fourth sub-pole sheet 122. The third sub-pole sheet 121 and the fourth sub-pole sheet 122 work independently. Compared with the structural setting of the entire negative electrode sheet 120, the uniformity of the current density and potential of the negative electrode sheet 120 along the first direction (X) can be improved, and the uniformity of the current density and potential of the battery cell 100 along the first direction (X) can be ensured, thereby improving the performance of the battery cell 100, extending the service life of the battery cell 100, and avoiding lithium deposition of the battery cell 100.

[0142] In some embodiments, the third sub-pole piece 121 and the fourth sub-pole piece 122 are spaced apart from each other along the first direction (X), and a second spacing region 123 is defined between the third sub-pole piece 121 and the fourth sub-pole piece 122 .

[0143] It should be noted that, in some embodiments, there may be multiple third sub-pole pieces 121 and fourth sub-pole pieces 122, and the third sub-pole pieces 121 and fourth sub-pole pieces 122 are arranged alternately and at intervals along the first direction (X). The embodiment of the present application does not require the number of the third sub-pole pieces 121 and the fourth sub-pole pieces 122.

[0144] In the embodiment of the present application, there are multiple positive electrode sheets 110 and multiple negative electrode sheets 120, and the negative electrode sheets 120 and the positive electrode sheets 110 are alternated along the thickness direction (Z) of the battery cell 100. Along the thickness direction (Z) of the battery cell 100, the second spacers 123 at least partially intersect.

[0145] Exemplarily, an angle may be formed between the extension direction of the center lines of some or all of the second spacers 123 and the first direction, so that the second spacers 123 intersect with each other.

[0146] In one embodiment, center lines of some or all of the second spacers 123 coincide with each other along the thickness direction (Z) of the battery cell 100 , such that the second spacers 123 are at least partially opposite to each other.

[0147] In this way, by such an arrangement, the positions of the second spacers 123 are different, so as to disperse the length distribution of the negative electrode sheet 120 along the first direction (X), thereby reducing the deflection of the negative electrode sheet 120 and further improving the uniformity of the thickness distribution of the battery cell 100. This can improve the flatness of the battery cell 100 and facilitate the assembly and production of the battery cell 100.

[0148] In some embodiments, the second spacers 123 are positioned relative to each other along the thickness direction (Z) of the battery cell 100. That is, the centerlines of the second spacers 123 along the thickness direction (Z) of the battery cell 100 coincide, and the second spacers 123 extend the same length along the first direction (X). During assembly of the battery cell 100, this relative positioning of the second spacers 123 of the negative electrode sheets 120 facilitates the positioning of the third and fourth sub-electrode sheets 121 and 122, thereby improving assembly efficiency of the battery cell 100.

[0149] In some embodiments, the second spacers 123 are spaced apart along the first direction (X), that is, two adjacent or spaced second spacers 123 have a distance along the first direction (X).

[0150] As an optional embodiment, the third sub-electrode sheets 121 are arranged opposite each other, and the fourth sub-electrode sheets 122 are arranged opposite each other along the thickness direction (Z) of the battery cell 100. In this way, the positions of all third sub-electrode sheets 121 and the relative positions of all fourth sub-electrode sheets 122 are fixed, facilitating the automated assembly of the battery cell 100 and improving the production efficiency of the battery cell 100.

[0151] In the embodiment of the present application, the third sub-pole sheets 121 extend to the same length along the first direction (X). Alternatively, the fourth sub-pole sheets 122 extend to the same length along the first direction (X). Thus, by varying the lengths of the third sub-pole sheets 121 or the fourth sub-pole sheets 122 along the first direction (X), the second spacer regions 123 of the negative electrode sheets 120 are staggered along the first direction (X).

[0152] In some embodiments, along the first direction (X), the third sub-electrode sheets 121 have the same extension length, and the fourth sub-electrode sheets 122 have the same extension length. In this way, the second spacers 123 of the negative electrode sheets 120 are aligned with each other along the thickness direction (Z) of the battery cell 100 .

[0153] As an optional embodiment, along the first direction (X), the extension length of the third sub-pole piece 121 is equal to the extension length of the fourth sub-pole piece 122. Alternatively, along the second direction (Y), the extension length of the third sub-pole piece 121 is equal to the extension length of the fourth sub-pole piece 122.

[0154] In some embodiments, along the first direction (X), the extension length of the third sub-pole piece 121 is equal to the extension length of the fourth sub-pole piece 122 , and along the second direction (Y), the extension length of the third sub-pole piece 121 is equal to the extension length of the fourth sub-pole piece 122 .

[0155] The following combination Figure 3 , an assembly structure of a battery cell 100 provided in an embodiment of the present application is described.

[0156] In some embodiments, adjacent electrode sheets include a positive electrode sheet 110 and a negative electrode sheet 120. The positive electrode sheet 110 includes a first sub-electrode sheet 111 and a second sub-electrode sheet 112, which are separately arranged along a first direction (X). The negative electrode sheet 120 includes a third sub-electrode sheet 121 and a fourth sub-electrode sheet 122, which are separately arranged along the first direction (X).

[0157] It should be noted that the structure of the first sub-pole piece 111 and the second sub-pole piece 112 being separately arranged, and the structure of the third sub-pole piece 121 and the fourth sub-pole piece 122 being separately arranged have been described in the above embodiments and will not be repeated here.

[0158] In the embodiment of the present application, the positive electrode sheet 110 is formed by the separate arrangement of the first sub-electrode sheet 111 and the second sub-electrode sheet 112, and the negative electrode sheet 120 is formed by the separate arrangement of the third sub-electrode sheet 121 and the fourth sub-electrode sheet 122. Together, they can reduce the length of the entire positive electrode sheet 110 and the negative electrode sheet 120, thereby reducing the deflection of the positive electrode sheet 110 and the negative electrode sheet 120. That is, the bending deformation of the positive electrode sheet 110 and the negative electrode sheet 120 is reduced, thereby ensuring the flatness of the battery cell 100 and making the thickness distribution of the battery cell 100 uniform, thereby further improving the production efficiency and yield rate of the battery cell 100 and the battery. Since the first sub-pole sheet 111 and the second sub-pole sheet 112 of the positive electrode sheet 110 are separately arranged, and the third sub-pole sheet 121 and the fourth sub-pole sheet 122 of the negative electrode sheet 120 are separately arranged, there is no mechanical connection relationship or electrical connection relationship between the first sub-pole sheet 111 and the second sub-pole sheet 112, and between the third sub-pole sheet 121 and the fourth sub-pole sheet 122. The first sub-pole sheet 111 and the second sub-pole sheet 112 work independently, and the third sub-pole sheet 121 and the fourth sub-pole sheet 122 can improve the uniformity of the current density and potential of the positive electrode sheet 110 and the negative electrode sheet 120 along the first direction (X) compared to the structural arrangement of the entire positive electrode sheet 110 and the negative electrode sheet 120, ensure the uniformity of the current density and potential of the battery cell 100 along the first direction (X), thereby improving the performance of the battery cell 100, extending the service life of the battery cell 100, and avoiding lithium deposition in the battery cell 100.

[0159] Exemplarily, the first sub-pole piece 111 and the second sub-pole piece 112 are spaced apart along the first direction (X), so that a first spacing region 113 is provided between the first sub-pole piece 111 and the second sub-pole piece 112, and the third sub-pole piece 121 and the fourth sub-pole piece 122 are spaced apart along the first direction (X), so that a second spacing region 123 is provided between the third sub-pole piece 121 and the fourth sub-pole piece 122.

[0160] When there are multiple positive electrode sheets 110 and multiple negative electrode sheets 120, the negative electrode sheets 120 and the positive electrode sheets 110 alternate along the thickness direction (Z) of the battery cell 100. Along the thickness direction (Z) of the battery cell 100, each first spacer 113 and each second spacer 123 at least partially intersect. In other words, the centerline of each first spacer 113 extending along the thickness direction (Z) of the battery cell 100 at least partially overlaps and intersects with the centerline of each second spacer 123 extending along the thickness direction (Z) of the battery cell 100.

[0161] It should be noted that the intersection of the first spacer 113 and the second spacer 123 can disperse the deflection distribution of the battery cell 100, prevent deformation of the battery cell 100, improve the flatness of the battery cell 100, facilitate assembly of the battery cell 100, and thus improve the production efficiency of the battery cell 100. At the same time, it can also prevent the heat generated by the battery cell 100 during use from being dispersed, avoiding localized heat concentration in the battery cell 100.

[0162] In some embodiments, each first spacer 113 and each second spacer 123 are disposed opposite each other along the thickness direction (Z) of the battery cell 100. That is, the centerline of each first spacer 113 coincides with the centerline of each second spacer 123, and each first spacer 113 and each second spacer 123 have the same extension length along the first direction (X).

[0163] In some embodiments, the first spacers 113 and the second spacers 123 are spaced apart along the first direction (X). That is, adjacent or spaced first spacers 113 and second spacers 123 have a spacing in the first direction (X).

[0164] See Figure 3 For example, along the thickness direction (Z) of the battery cell 100, the first sub-electrode sheet 111 and the third sub-electrode sheet 121 are arranged opposite each other, and the second sub-electrode sheet 112 and the fourth sub-electrode sheet 122 are arranged opposite each other. This arrangement allows the first sub-electrode sheet 111 and the third sub-electrode sheet 121, and the second sub-electrode sheet 112 and the fourth sub-electrode sheet 122 to be arranged in a regular structure, facilitating assembly of the battery cell 100 and improving production efficiency of the battery cell 100.

[0165] In some embodiments, along the first direction (X), the extended length of the first sub-electrode tab 111 is equal to the extended length of the second sub-electrode tab 112, and the extended length of the third sub-electrode tab 121 is equal to the extended length of the fourth sub-electrode tab 122. And / or, along the second direction (Y), the extended length of the first sub-electrode tab 111 is equal to the extended length of the second sub-electrode tab 112, and the extended length of the third sub-electrode tab 121 is equal to the extended length of the fourth sub-electrode tab 122. In this way, by having the first and second sub-electrode tabs 111, 112, and the third and fourth sub-electrode tabs 121, 122 have the same extended length, the processing difficulty of the positive electrode tab 110 and the negative electrode tab 120 is reduced, thereby improving the production efficiency of the positive electrode tabs 110 and the negative electrode tabs 120, and simplifying the stacking and assembly of the positive electrode tabs 110 and the negative electrode tabs 120, thereby increasing the production efficiency of the battery cell 100.

[0166] In some embodiments, along the first direction (X), the extension length of the third sub-pole piece 121 is W1, the extension length of the first sub-pole piece 111 is W2, W1 / W2=Q1, and Q1 satisfies: 1.001≤Q1≤1.01.

[0167] Exemplarily, Q1 can be 1.001, 1.003, 1.005, 1.007, 1.009, 1.01, etc. The value of Q1 only needs to fall within the above numerical range. The present embodiment does not require a specific value for Q1. It is readily understood that the third sub-electrode sheet 121 has a negative polarity, the first sub-electrode sheet 111 has a positive polarity, and along the first direction (X), the extension length W1 of the third sub-electrode sheet 121 is greater than the extension length W2 of the first sub-electrode sheet 111. This configuration increases the area of ​​the negative electrode sheet 120, allowing the negative active material layer 127 of the negative electrode sheet 120 to provide more lithium ion sites, thereby accommodating more lithium ions during charging, thereby improving the charging efficiency of the battery cell 100. This also reduces free lithium ions, preventing lithium deposition in the battery cell 100 due to excessive lithium ion deposition, further improving the safety of the battery cell 100, and extending the service life of the battery cell 100.

[0168] In some embodiments, along the second direction (Y), the extension length of the third sub-pole piece 121 is W3, and the extension length of the first sub-pole piece 111 is W4, wherein W3 / W4=Q2, and Q2 satisfies: 1.001≤Q2≤1.01.

[0169] For example, Q2 can be 1.001, 1.003, 1.005, 1.007, 1.009, 1.01, etc. As long as the value of Q2 meets the above numerical range, the embodiment of the present application does not require a specific value of Q2.

[0170] It should be noted that, by requiring the extension length of the third sub-pole sheet 121 and the first sub-pole sheet 111 along the second direction (Y), the structural dimensions of the third sub-pole sheet 121 are larger than the structural dimensions of the first sub-pole sheet 111, thereby increasing the area of ​​the negative electrode sheet 120, and enabling the negative electrode active material layer 127 of the negative electrode sheet 120 to provide more lithium ion sites to accommodate more lithium ions during the charging process, thereby improving the charging efficiency of the battery cell 100, and reducing the free lithium ions, thereby avoiding lithium deposition of the battery cell 100 caused by excessive lithium ion deposition, further improving the safety of the battery cell 100, and extending the service life of the battery cell 100.

[0171] It should be noted that in the embodiment of the present application, the second sub-pole piece 112 has the same structural dimensions as the first sub-pole piece 111, and the fourth sub-pole piece 122 has the same structural dimensions as the third sub-pole piece 121. It is not difficult to understand that the structural dimensions between the fourth sub-pole piece 122 and the second sub-pole piece 112 also meet the above-mentioned Q1 and / or Q2. The structural dimensions and corresponding functions between the fourth sub-pole piece 122 and the second sub-pole piece 112 will not be described in detail. In addition, Q1 and Q2 in the embodiment of the present application can be combined with each other. The embodiment of the present application does not require the specific values ​​of the mutual combination of Q1 and Q2.

[0172] In some embodiments, along the first direction (X), a spacing L1 is defined between the first sub-electrode sheet 111 and the second sub-electrode sheet 112. L1 is the length of the first spacing region 113. The positive electrode sheet 110 extends along the first direction (X) by a length L2 equal to the sum of the lengths of the first sub-electrode sheet 111, the lengths of the second sub-electrode sheet 112, and L1. L1 / L2 = Q3, where Q3 satisfies the following: 0.001≤Q3≤0.01.

[0173] For example, Q3 may be equal to 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, etc. By setting the spacing requirement between the first sub-electrode sheet 111 and the second sub-electrode sheet 112, the spacing between the first sub-electrode sheet 111 and the second sub-electrode sheet 112 is made smaller, thereby preventing uneven thickness of the battery cell 100 caused by excessive spacing. In addition, during the assembly of the battery cell 100, the first sub-electrode sheet 111 and the second sub-electrode sheet 112 are prevented from piercing the diaphragm 130 at the position of the first spacing region 113, thereby preventing a short circuit inside the battery cell 100. This improves the structural stability and safety of the battery cell 100 and extends the service life of the battery cell 100.

[0174] In some embodiments, along the first direction (X), a distance L3 is defined between the third sub-pole sheet 121 and the fourth sub-pole sheet 122. The negative electrode sheet 120 extends along the first direction (X) by a length L4, where L4 is equal to the sum of the extension lengths of the third sub-pole sheet 121, the extension lengths of the fourth sub-pole sheet 122, and L3. Here, L3 / L4=Q4, where Q4 satisfies the following: 0.001≤Q4≤0.01.

[0175] For example, Q4 may be equal to 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, etc. By setting the spacing requirement between the third sub-pole tab 121 and the fourth sub-pole tab 122, the spacing between the third sub-pole tab 121 and the fourth sub-pole tab 122 is made smaller, thereby preventing uneven thickness of the battery cell 100 caused by excessive spacing. In addition, during the assembly of the battery cell 100, the third sub-pole tab 121 and the fourth sub-pole tab 122 are prevented from piercing the diaphragm 130 at the position of the second spacing region 123, thereby preventing a short circuit within the battery cell 100. This improves the structural stability and safety of the battery cell 100 and extends the service life of the battery cell 100.

[0176] It should be noted that Q3 and Q4 in the embodiment of the present application can be combined with each other, and the embodiment of the present application does not require the specific numerical values ​​of the combination between Q3 and Q4.

[0177] In some embodiments, along the first direction (X), the extended length of the negative electrode sheet 120 is L4, and the extended length of the positive electrode sheet 110 is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01; and / or, along the second direction (Y), the extended length of the negative electrode sheet 120 is L5, and the extended length of the positive electrode sheet 110 is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.01.

[0178] It is not difficult to understand that the extension length of the negative electrode sheet 120 along the first direction (X) and / or along the second direction (Y) is larger than the extension length of the positive electrode sheet 110 in the same direction. That is to say, along the thickness direction (Z) of the battery cell 100, the negative electrode sheet 120 covers the positive projection of the positive electrode sheet 110 on the plane where the negative electrode sheet 120 is located, and the area of ​​the negative electrode active material layer 127 on the negative electrode sheet 120 is relatively large. In this way, more lithium ion sites can be provided through the negative electrode active material layer 127, thereby improving the charge and discharge efficiency of the battery cell 100 and preventing lithium plating, thereby improving the safety of the battery.

[0179] For example, Q5 can be 1.001, 1.003, 1.005, 1.007, 1.009, 1.01, etc. The value of Q2 only needs to satisfy the above numerical range. The embodiment of the present application does not require a specific value of Q6.

[0180] For example, Q6 can be 1.001, 1.003, 1.005, 1.007, 1.009, 1.01, etc. As long as the value of Q6 meets the above numerical range, the embodiment of the present application does not require a specific value of Q6.

[0181] It should be noted that Q5 and Q6 in the embodiment of the present application can be combined with each other, and the embodiment of the present application does not require the specific numerical values ​​of the combination between Q5 and Q6.

[0182] See Figures 4 to 11 In some embodiments, each pole piece is provided with a pole ear that protrudes from the side edge of the pole piece.

[0183] See Figures 4 to 9 Optionally, the number of pole tabs on each pole piece is at least two, and the at least two pole tabs are respectively arranged on opposite sides of the pole piece along the first direction (X).

[0184] In the embodiment of the present application, the positive electrode sheet 110 includes a positive current collector 116 and a positive active material layer 117. The positive active material layer 117 is disposed on opposite sides of the positive current collector 116 along the thickness direction (Z) of the battery cell 100. The tabs of the positive electrode sheet 110 are disposed on the positive current collector 116, located on opposite sides of the positive current collector 116 along the first direction (X) and protruding from the side edges of the positive current collector 116. The negative electrode sheet 120 includes a negative current collector 126 and a negative active material layer 127. The negative active material layer 127 is disposed on opposite sides of the negative current collector 126 along the thickness direction (Z) of the battery cell 100. The tabs of the negative electrode sheet 120 are disposed on the negative current collector 126, located on opposite sides of the negative current collector 126 along the first direction (X) and protruding from the side edges of the negative current collector 126. In this way, the position of the tab on the electrode sheet allows the corresponding positive electrode active material layer 117 and negative electrode active material layer 127 to be fully utilized, thereby improving the capacity and energy density of the battery.

[0185] Combine Figure 4 and Figure 5 In some embodiments, adjacent electrode sheets have opposite polarities, and adjacent tabs may be located at the same end of the corresponding electrode sheets along the first direction (X). In this case, the tabs on adjacent electrode sheets are staggered along the second direction (Y). In this manner, the tabs of the positive electrode sheets 110 are stacked along the thickness direction (Z) of the battery cell 100, and the tabs of the negative electrode sheets 120 are stacked along the thickness direction (Z) of the battery cell 100. This facilitates the connection between the tabs of the positive electrode sheets 110 and the negative electrode sheets 120 and the electrode posts 220, improving the battery cell 100 and the production efficiency of the battery cell 100.

[0186] In some embodiments, adjacent electrode sheets include a positive electrode sheet 110 and a negative electrode sheet 120 . The positive electrode sheet 110 is provided with a first positive electrode tab 114 and a second positive electrode tab 115 . Along the first direction (X), the first positive electrode tab 114 and the second positive electrode tab 115 are located at opposite ends of the positive electrode sheet 110 .

[0187] See Figure 4 、 Figure 6 、 Figure 8 For example, the first positive electrode tab 114 may be disposed on the first sub-electrode sheet 111, and the second positive electrode tab 115 may be disposed on the second sub-electrode sheet 112. Along the first direction (X), the first positive electrode tab 114 is located at the end of the first sub-electrode sheet 111 facing away from the second sub-electrode sheet 112, and the second positive electrode tab 115 is located at the end of the second sub-electrode sheet 112 facing away from the first sub-electrode sheet 111. Along the second direction (Y), the first positive electrode tab 114 and the second positive electrode tab 115 may be located on the same side of the positive electrode sheet 110.

[0188] In some embodiments, the negative electrode sheet 120 is provided with a first negative electrode tab 124 and a second negative electrode tab 125 . Along the first direction (X), the first negative electrode tab 124 and the second negative electrode tab 125 are located at opposite ends of the negative electrode sheet 120 .

[0189] See Figure 5 、 Figure 7 、 Figure 9 For example, the first negative electrode tab 124 can be disposed on the third sub-electrode sheet 121, and the second negative electrode tab 125 can be disposed on the fourth sub-electrode sheet 122. Along the first direction (X), the first negative electrode tab 124 is located at the end of the third sub-electrode sheet 121 facing away from the fourth sub-electrode sheet 122, and the second negative electrode tab 125 is located at the end of the fourth sub-electrode sheet 122 facing away from the third sub-electrode sheet 121. Along the second direction (Y), the first negative electrode tab 124 and the second negative electrode tab 125 can be located on the same side of the negative electrode sheet 120.

[0190] In an optional embodiment of the present application, see Figure 4 、 Figure 6 、 Figure 8 In the positive electrode sheet 110 , along the second direction (Y), the first positive electrode tab 114 and the second positive electrode tab 115 are staggered. That is, along the second direction (Y), the first positive electrode tab 114 and the second positive electrode tab 115 are located on different sides of the positive electrode sheet 110 .

[0191] See Figure 5 、 Figure 7 and Figure 9 In the negative electrode sheet 120 , the first negative electrode tab 124 and the second negative electrode tab 125 are staggered along the second direction (Y). That is, along the second direction (Y), the first negative electrode tab 124 and the second negative electrode tab 125 are located on different sides of the negative electrode sheet 120 .

[0192] See Figure 6 and Figure 8 In some embodiments, there are multiple first positive electrode tabs 114 , and the multiple first positive electrode tabs 114 are arranged at intervals along the second direction (Y).

[0193] See Figure 6In some embodiments, there are multiple second positive electrode tabs 115 , and the multiple second positive electrode tabs 115 are arranged at intervals along the second direction (Y).

[0194] See Figure 7 and Figure 9 In some embodiments, there are multiple first negative electrode tabs 124 , and the multiple first negative electrode tabs 124 are arranged at intervals along the second direction (Y).

[0195] See Figure 7 In some embodiments, there are multiple second negative electrode tabs 125 , and the multiple second negative electrode tabs 125 are arranged at intervals along the second direction (Y).

[0196] See Figures 6 to 9 In one embodiment of the present application, at least one of the first positive electrode tab 114, the second positive electrode tab 115, the first negative electrode tab 124, and the second negative electrode tab 125 may be multiple. This arrangement allows for uniform current distribution on the corresponding positive electrode sheet 110 and the negative electrode sheet 120, reducing localized current density, thereby reducing localized overheating and uneven electrochemical reactions, and avoiding lithium deposition. Furthermore, by providing multiple first positive electrode tabs 114, multiple second positive electrode tabs 115, multiple first negative electrode tabs 124, and / or multiple second negative electrode tabs 125, the battery cell 100 has multiple current paths, reducing current impedance and energy loss.

[0197] Optional, see Figure 10 and Figure 11 The pole ear is arranged at at least one end of the pole piece along the second direction (Y).

[0198] See Figure 10 and Figure 11 In some embodiments, the pole tabs on adjacent pole pieces are staggered along the first direction (X).

[0199] For example, see Figure 10 The positive electrode sheet 110 is provided with a first positive electrode tab 114 and a second positive electrode tab 115. Along the second direction (Y), the first positive electrode tab 114 and the second positive electrode tab 115 are located on the same side of the positive electrode sheet 110. The negative electrode sheet 120 is provided with a first negative electrode tab 124 and a second negative electrode tab 125. Along the second direction (Y), the first negative electrode tab 124 and the second negative electrode tab 125 are located on the same side of the negative electrode sheet 120. In addition, along the first direction (X), the first positive electrode tab 114 and the first negative electrode tab 124 are staggered along the first direction (X), and the second positive electrode tab 115 and the second negative electrode tab 125 are staggered along the first direction (X).

[0200] See Figure 10In some embodiments, there are multiple first positive electrode tabs 114 , and the multiple first positive electrode tabs 114 are arranged at intervals along the first direction (X).

[0201] See Figure 10 In some embodiments, there are multiple second positive electrode tabs 115 , and the multiple second positive electrode tabs 115 are arranged at intervals along the first direction (X).

[0202] See Figure 11 In some embodiments, there are multiple first negative electrode tabs 124 , and the multiple first negative electrode tabs 124 are arranged at intervals along the first direction (X).

[0203] See Figure 11 In some embodiments, there are multiple second negative electrode tabs 125 , and the multiple second negative electrode tabs 125 are arranged at intervals along the first direction (X).

[0204] It should be noted that the functions of the plurality of first positive electrode tabs 114 , second positive electrode tabs 115 , first negative electrode tabs 124 and second negative electrode tabs 125 in this section have been described in the aforementioned embodiments and will not be repeated here.

[0205] See Figure 12 and Figure 13 In a second aspect, an embodiment of the present application may further provide a battery cell 200 comprising: a housing 210 and the battery cell 100 provided in the first aspect. The housing 210 has a receiving cavity. The battery cell 100 is disposed in the receiving cavity.

[0206] In some embodiments, a pole 220 is provided on the housing 210 , and the battery cell 100 and the pole 220 are electrically connected.

[0207] For example, the pole 220 can be welded to the housing 210 or embedded in the housing 210. The embodiment of the present application does not require the specific connection method between the pole 220 and the housing 210. The pole 220 and the tab of the battery cell 100 are arranged in a corresponding position, and the tab of the battery cell 100 is connected to the pole 220 to achieve electrical connection between the battery cell 100 and the housing 210.

[0208] The battery cell 200 provided in the embodiment of the present application includes the battery cell 100 provided in the first aspect. The performance of the battery cell 200 can be improved through the structural arrangement of the battery cell 100.

[0209] In a third aspect, an embodiment of the present application may further provide a battery pack, comprising the battery cell 200 provided in the second aspect.

[0210] The battery pack provided in the embodiment of the present application can improve the performance of the battery pack because it includes the battery cell 200 provided in the second aspect.

[0211] In a fourth aspect, the embodiments of the present application may further provide an electrical device, comprising the battery cell 200 provided in the second aspect, or the battery pack provided in the third aspect.

[0212] It should be noted that the electrical device in the embodiment of the present application can be a vehicle, etc. There is no specific requirement for the form of power energy of the vehicle, and the electrical device is not limited to a vehicle.

[0213] Since the electric device in the embodiment of the present application includes the battery cell 200 provided in the second aspect or the battery pack provided in the third aspect, the performance of the electric device can be improved.

[0214] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0215] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0216] It should be readily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0217] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90° or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0218] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A plurality of pole pieces, wherein the plurality of pole pieces are stacked along the thickness direction of the battery core (100); the polarities of two adjacent pole pieces are opposite; a diaphragm (130), the diaphragm (130) being arranged between two adjacent pole pieces; At least one of the pole pieces comprises at least two sub-pole pieces, and the at least two sub-pole pieces are separately arranged along a first direction; the first direction intersects with the thickness direction of the battery cell (100).

2. The battery cell according to claim 1, characterized in that At least two of the sub-pole pieces are spaced apart along the first direction.

3. The battery cell according to claim 2, characterized in that The first direction is along the length direction of the battery core (100).

4. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode piece comprises a positive electrode piece (110); the positive electrode piece (110) comprises a first sub-electrode piece (111) and a second sub-electrode piece (112); the first sub-electrode piece (111) and the second sub-electrode piece (112) are separately arranged along the first direction.

5. The battery cell according to claim 4, characterized in that: A first spacing region (113) is provided between the first sub-pole piece (111) and the second sub-pole piece (112).

6. The battery cell according to claim 5, characterized in that The electrode sheets further include a negative electrode sheet (120); the positive electrode sheet (110) and the negative electrode sheet (120) are both multiple, and the negative electrode sheets (120) and the positive electrode sheets (110) are alternated in sequence along the thickness direction of the battery cell (100); Along the thickness direction of the battery core (100), the first spacers (113) at least partially intersect with each other.

7. The battery cell according to claim 5, characterized in that The electrode sheets further include a negative electrode sheet (120); the positive electrode sheet (110) and the negative electrode sheet (120) are both multiple, and the negative electrode sheets (120) and the positive electrode sheets (110) are alternated in sequence along the thickness direction of the battery cell (100); Along the first direction, the first spacing areas (113) are arranged at intervals.

8. The battery cell according to claim 6, characterized in that: Along the thickness direction of the battery core (100), the first sub-pole pieces (111) are arranged opposite to each other, and the second sub-pole pieces (112) are arranged opposite to each other.

9. The battery cell according to claim 8, characterized in that: Along the first direction, the extension lengths of the first sub-pole pieces (111) are the same; And / or, along the first direction, the extension lengths of the second sub-pole pieces (112) are the same.

10. The battery cell according to claim 8, characterized in that Along the first direction, the extension length of the first sub-pole piece (111) is equal to the extension length of the second sub-pole piece (112); and / or, along the second direction, the extension length of the first sub-pole piece (111) is equal to the extension length of the second sub-pole piece (112); The first direction, the second direction, and the thickness direction of the battery cell (100) are perpendicular to each other.

11. The battery cell according to claim 4, characterized in that: Along the first direction, there is a spacing between the first sub-pole sheet (111) and the second sub-pole sheet (112), the spacing is L1, and the extension length of the positive electrode sheet (110) is L2, wherein L1 / L2=Q3, and Q3 satisfies: 0.001≤Q3≤0.

01.

12. The battery cell according to claim 6, characterized in that Along the first direction, the extension length of the negative electrode sheet (120) is L4, and the extension length of the positive electrode sheet (110) is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01; And / or, along the second direction, the extension length of the negative electrode sheet (120) is L5, and the extension length of the positive electrode sheet (110) is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.

01.

13. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode sheet includes a negative electrode sheet (120); The negative electrode sheet (120) comprises a third sub-electrode sheet (121) and a fourth sub-electrode sheet (122), and the third sub-electrode sheet (121) and the fourth sub-electrode sheet (122) are separately arranged along the first direction.

14. The battery cell according to claim 13, characterized in that: A second spacing region (123) is provided between the third sub-pole piece (121) and the fourth sub-pole piece (122).

15. The battery cell according to claim 14, characterized in that: The electrode sheets further include a positive electrode sheet (110), the positive electrode sheet (110) and the negative electrode sheet (120) are both multiple, and the negative electrode sheets (120) and the positive electrode sheets (110) are alternated in sequence along the thickness direction of the battery cell (100); Along the thickness direction of the battery core (100), the second spacers (123) at least partially intersect with each other.

16. The battery cell according to claim 14, characterized in that The electrode sheets further include a positive electrode sheet (110), the positive electrode sheet (110) and the negative electrode sheet (120) are both multiple, and the negative electrode sheets (120) and the positive electrode sheets (110) are alternated in sequence along the thickness direction of the battery cell (100); Along the first direction, the second spacing areas (123) are arranged at intervals.

17. The battery cell according to claim 15, characterized in that: Along the thickness direction of the battery core (100), the third sub-pole pieces (121) are arranged opposite to each other, and the fourth sub-pole pieces (122) are arranged opposite to each other.

18. The battery cell according to claim 17, characterized in that: Along the first direction, the extension lengths of the third sub-pole pieces (121) are the same; And / or, along the first direction, the extension lengths of the fourth sub-pole pieces (122) are the same.

19. The battery cell according to claim 17, characterized in that: Along the first direction, the extension length of the third sub-pole piece (121) is equal to the extension length of the fourth sub-pole piece (122); And / or, along the second direction, the extension length of the third sub-pole piece (121) is equal to the extension length of the fourth sub-pole piece (122).

20. The battery cell according to claim 13, characterized in that Along the first direction, there is a spacing between the third sub-pole sheet (121) and the fourth sub-pole sheet (122), the spacing is L3, and the extension length of the negative electrode sheet (120) is L4, wherein L3 / L4=Q4, and Q4 satisfies: 0.001≤Q4≤0.

01.

21. The battery cell according to claim 15, characterized in that Along the first direction, the extension length of the negative electrode sheet (120) is L4, and the extension length of the positive electrode sheet (110) is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01; And / or, along the second direction, the extension length of the negative electrode sheet (120) is L5, and the extension length of the positive electrode sheet (110) is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.

01.

22. The battery cell according to any one of claims 1 to 3, characterized in that: The adjacent electrode pieces include a positive electrode piece (110) and a negative electrode piece (120), the positive electrode piece (110) includes a first sub-electrode piece (111) and a second sub-electrode piece (112), and the first sub-electrode piece (111) and the second sub-electrode piece (112) are separately arranged along the first direction; The negative electrode sheet (120) comprises a third sub-electrode sheet (121) and a fourth sub-electrode sheet (122), and the third sub-electrode sheet (121) and the fourth sub-electrode sheet (122) are separately arranged along the first direction.

23. The battery cell according to claim 22, characterized in that: A first spacing region (113) is provided between the first sub-pole piece (111) and the second sub-pole piece (112); And / or, a second spacing region (123) is provided between the third sub-pole piece (121) and the fourth sub-pole piece (122).

24. The battery cell according to claim 23, characterized in that There are multiple positive electrode sheets (110) and multiple negative electrode sheets (120), and the negative electrode sheets (120) and the positive electrode sheets (110) are alternated in sequence along the thickness direction of the battery cell (100); Along the thickness direction of the battery core (100), the first spacers (113) at least partially intersect with each other; And / or, along the thickness direction of the battery core (100), the second spacers (123) at least partially intersect with each other.

25. The battery cell according to claim 24, characterized in that Along the first direction, the first spacers (113) are arranged at intervals; And / or, along the first direction, the second spacer areas (123) are arranged at intervals.

26. The battery cell according to claim 24, characterized in that Along the thickness direction of the battery core (100), the first sub-pole piece (111) and the third sub-pole piece (121) are arranged opposite to each other, and the second sub-pole piece (112) and the fourth sub-pole piece (122) are arranged opposite to each other.

27. The battery cell according to claim 24, characterized in that Along the first direction, the extension length of the first sub-pole piece (111) is equal to the extension length of the second sub-pole piece (112), and the extension length of the third sub-pole piece (121) is equal to the extension length of the fourth sub-pole piece (122); And / or, along the second direction, the extension length of the first sub-pole piece (111) is equal to the extension length of the second sub-pole piece (112), and the extension length of the third sub-pole piece (121) is equal to the extension length of the fourth sub-pole piece (122).

28. The battery cell according to claim 27, characterized in that: Along the first direction, the extension length of the third sub-pole piece (121) is W1, and the extension length of the first sub-pole piece (111) is W2, wherein W1 / W2=Q1, and Q1 satisfies: 1.001≤Q1≤1.01; And / or, along the second direction, the extension length of the third sub-pole piece (121) is W3, and the extension length of the first sub-pole piece (111) is W4, wherein W3 / W4=Q2, and Q2 satisfies: 1.001≤Q2≤1.

01.

29. The battery cell according to claim 27, characterized in that Along the first direction, there is a spacing between the first sub-pole sheet (111) and the second sub-pole sheet (112), the spacing is L1, and the extension length of the positive electrode sheet (110) is L2, wherein L1 / L2=Q3, and Q3 satisfies: 0.001≤Q3≤0.01; And / or, along the first direction, there is a spacing between the third sub-pole sheet (121) and the fourth sub-pole sheet (122), the spacing is L3, and the extension length of the negative electrode sheet (120) is L4, wherein L3 / L4=Q4, and Q4 satisfies: 0.001≤Q4≤0.

01.

30. The battery cell according to claim 22, characterized in that Along the first direction, the extension length of the negative electrode sheet (120) is L4, and the extension length of the positive electrode sheet (110) is L2, wherein L4 / L2=Q5, and Q5 satisfies: 1.001≤Q5≤1.01; And / or, along the second direction, the extension length of the negative electrode sheet (120) is L5, and the extension length of the positive electrode sheet (110) is L6, wherein L5 / L6=Q6, and Q6 satisfies: 1.001≤Q6≤1.

01.

31. The battery cell according to any one of claims 1 to 30, characterized in that: Each of the pole pieces is provided with a pole lug, and the pole lug protrudes from the side edge of the pole piece.

32. The battery cell according to claim 31, characterized in that The number of the pole tabs on each pole piece is at least two, and the at least two pole tabs are respectively arranged on two opposite sides of the pole piece along the first direction.

33. The battery cell according to claim 32, characterized in that The pole tabs on adjacent pole pieces are staggered along the second direction.

34. The battery cell according to claim 33, characterized in that The adjacent electrode sheets include a positive electrode sheet (110) and a negative electrode sheet (120), the positive electrode sheet (110) is provided with a first positive electrode tab (114) and a second positive electrode tab (115), and along the first direction, the first positive electrode tab (114) and the second positive electrode tab (115) are located at opposite ends of the positive electrode sheet (110); And / or, a first negative electrode tab (124) and a second negative electrode tab (125) are provided on the negative electrode sheet (120), and along the first direction, the first negative electrode tab (124) and the second negative electrode tab (125) are located at opposite ends of the negative electrode sheet (120).

35. The battery cell according to claim 34, characterized in that In the positive electrode sheet (110), along the second direction, the first positive electrode tab (114) and the second positive electrode tab (115) are staggered; And / or, in the negative electrode sheet (120), along the second direction, the first negative electrode tab (124) and the second negative electrode tab (125) are staggered.

36. The battery cell according to claim 34 or 35, characterized in that: There are a plurality of first positive electrode tabs (114), and the plurality of first positive electrode tabs (114) are arranged at intervals along the second direction; And / or, there are a plurality of second positive electrode tabs (115), and the plurality of second positive electrode tabs (115) are arranged at intervals along the second direction; And / or, there are a plurality of first negative electrode tabs (124), and the plurality of first negative electrode tabs (124) are arranged at intervals along the second direction; And / or, there are a plurality of second negative electrode tabs (125), and the plurality of second negative electrode tabs (125) are arranged at intervals along the second direction.

37. The battery cell according to claim 31, characterized in that The pole tab is arranged at at least one end of the pole piece along the second direction.

38. The battery cell according to claim 37, characterized in that The pole tabs on adjacent pole pieces are staggered along the first direction.

39. The battery cell according to claim 38, characterized in that The adjacent electrode sheets include a positive electrode sheet (110) and a negative electrode sheet (120), the positive electrode sheet (110) is provided with a first positive electrode tab (114) and a second positive electrode tab (115), and along the second direction, the first positive electrode tab (114) and the second positive electrode tab (115) are located on the same side of the positive electrode sheet (110); And / or, a first negative electrode tab (124) and a second negative electrode tab (125) are provided on the negative electrode sheet (120), and along the second direction, the first negative electrode tab (124) and the second negative electrode tab (125) are located on the same side of the negative electrode sheet (120).

40. The battery cell according to claim 39, characterized in that There are a plurality of first positive electrode tabs (114), and the plurality of first positive electrode tabs (114) are arranged at intervals along the first direction; And / or, there are a plurality of second positive electrode tabs (115), and the plurality of second positive electrode tabs (115) are arranged at intervals along the first direction; And / or, there are a plurality of first negative electrode tabs (124), and the plurality of first negative electrode tabs (124) are arranged at intervals along the first direction; And / or, there are multiple second negative electrode tabs (125), and the multiple second negative electrode tabs (125) are arranged at intervals along the first direction.

41. A battery cell, characterized in that: include: A housing (210), wherein the housing (210) has a receiving cavity; A battery cell (100), wherein the battery cell (100) is the battery cell (100) according to any one of claims 1 to 40, and the battery cell (100) is arranged in a receiving cavity.

42. The battery cell according to claim 41, characterized in that A pole (220) is provided on the housing (210), and the battery core (100) and the pole (220) are electrically connected.

43. A battery pack, characterized in that: include: A battery cell (200) as claimed in any one of claims 41 or 42.

44. An electrical device, characterized in that: include: The battery cell (200) according to any one of claims 41 or 42; Alternatively, a battery pack as claimed in claim 43.

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