Pole piece and battery

Abstract

The utility model discloses a pole piece and a battery. The pole piece comprises a current collector and a conductive structure, in the utility model, the current collector comprises a first insulating layer, a first conducting layer and a second conducting layer, and the first conducting layer and the second conducting layer are respectively arranged on two opposite surfaces of the first insulating layer. The conductive structure is connected with the current collector and comprises a connecting section and a confluence section, the connecting section and the confluence section are integrally formed, the connecting section is arranged at one end close to the current collector and extends in the direction away from the current collector, and the confluence section is arranged at one end away from the current collector and extends in the direction away from the connecting section. Wherein the connecting section is provided with a separation seam, the separation seam is used for separating the connecting section into a plurality of conductive parts, one part of the plurality of conductive parts is connected with the first conductive layer, and the other part of the plurality of conductive parts is connected with the second conductive layer. The utility model solves the problem that the energy density of the battery is reduced due to overweight of the battery caused by a pole piece structure in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and more specifically, to an electrode and a battery. Background Technology

[0002] The composite current collector adopts a three-layer composite structure of "metal-polymer material-metal". Nanoscale metal is formed on the surface of polymer PET / PP film through vacuum evaporation, magnetron sputtering and other methods. Then, the metal layer is deposited and thickened to more than 1μm through electroplating. It replaces the traditional aluminum foil and copper foil as the positive and negative electrode materials of the battery, and has the advantages of low cost, high safety, long life and high energy density.

[0003] In existing technologies, composite current collectors need to be welded to tabs to form electrode sheets. Optimizing the welding structure between the composite current collector and the tabs is a crucial issue for battery manufacturers. For example, Chinese patent CN108963311A provides a secondary battery and its electrode sheet. The electrode sheet includes a current collector, an active material layer, and a conductive structure. The current collector includes an insulating layer, a first conductive layer, and a second conductive layer, which are respectively disposed on two surfaces of the insulating layer. The first conductive layer has a first main body and a first protrusion connected to the first main body. The surface of the first main body away from the insulating layer is covered by the active material layer. The second conductive layer has a second main body and a second protrusion connected to the second main body. The surface of the second main body away from the insulating layer is covered by the active material layer. The conductive structure includes a first conductive element and a second conductive element. The first conductive element is connected to the first protrusion, and the second conductive element is connected to the second protrusion. The second conductive element is bent towards the first conductive element and connected to it. The first conductive element extends away from the active material layer and beyond the second conductive element.

[0004] The electrode disclosed in Chinese patent CN108963311A requires two conductive elements to be connected to both sides of the current collector, which increases the battery weight and reduces the battery energy density. Utility Model Content

[0005] The main objective of this invention is to provide an electrode and a battery that at least solves the problem in the prior art where the electrode structure leads to excessive battery weight and reduced battery energy density.

[0006] According to one aspect of the present invention, an electrode sheet is provided, comprising:

[0007] A current collector, comprising a first insulating layer, a first conductive layer, and a second conductive layer, wherein the first conductive layer and the second conductive layer are respectively disposed on two opposite surfaces of the first insulating layer;

[0008] A conductive structure is connected to the current collector. The conductive structure includes a connecting section and a busbar section, which are integrally formed. The connecting section is located at one end close to the current collector and extends in a direction away from the current collector. The busbar section is located at one end away from the current collector and extends in a direction away from the connecting section.

[0009] The connecting segment is provided with a partition seam, which is used to divide the connecting segment into multiple conductive parts. A portion of the multiple conductive parts is connected to the first conductive layer, and the remaining conductive parts are connected to the second conductive layer.

[0010] Further, the conductive portion connected to the first conductive layer includes a first connector and a first bending member. The first connector is connected to the first conductive layer, and the first bending member is connected between the first connector and the busbar. The first bending member is inclined along a first direction so that the first connector and the busbar are in different planes; and / or,

[0011] The conductive portion connected to the second conductive layer includes a second connector and a second bending member. The second connector is connected to the second conductive layer, and the second bending member is connected between the second connector and the busbar. The second bending member is inclined in a direction opposite to the first direction so that the second connector and the busbar are in different planes.

[0012] Furthermore, the first bending member is inclined along the first direction so that the first connecting member and the confluence section are in different planes, and the second connecting member and the confluence section are in the same plane; or,

[0013] The second bending member is tilted in a direction opposite to the first direction so that the second connector and the confluence section are in different planes, while the first connector and the confluence section are in the same plane.

[0014] Furthermore, along the first direction, the projection surface of the conductive structure is a first isosceles trapezoidal surface, and along the second direction, the width of the first isosceles trapezoidal surface gradually decreases; or,

[0015] Along the first direction, the projection surface of the confluence segment is a second isosceles trapezoidal surface, and along the second direction, the width of the second isosceles trapezoidal surface gradually increases; or,

[0016] Along the first direction, the projection surface of the conductive structure is a rectangular surface.

[0017] Furthermore, the corners of the connecting section and / or the merging section are chamfered.

[0018] Furthermore, the minimum width L1 of the separation joint satisfies the following relationship: L1≥0; and / or,

[0019] The angle A between the extension direction of the partition joint and the second direction satisfies the following relationship: 0 ≤ A < 90° or 270° < A ≤ 360°; and / or,

[0020] The dividing seam includes at least one of two types: a serrated seam and a straight seam.

[0021] Furthermore, the partition seam includes at least one, and when there are multiple partition seams, the multiple partition seams are spaced apart along a third direction to divide the connecting segment into multiple conductive portions.

[0022] Furthermore, the portion of the conductive part connected to the first conductive layer is the first conductive part, and the portion of the conductive part connected to the second conductive layer is the second conductive part. Along the third direction, the first conductive part and the second conductive part are alternately arranged.

[0023] Furthermore, along the first direction, a portion of the projection plane of the first conductive portion overlaps with a portion of the projection plane of the second conductive portion; and / or,

[0024] Along the first direction, the area of ​​the projection surface of one of the first conductive part and the second conductive part is greater than or equal to the area of ​​the projection surface of the other part.

[0025] Furthermore, the current collector has a first segment and a second segment connected to each other along the second direction, the surface of the first conductive layer of the first segment away from the first insulating layer is covered with a first active material layer, and the surface of the second conductive layer of the first segment away from the first insulating layer is covered with a second active material layer.

[0026] The first conductive layer of the second segment is connected to the conductive part by welding or conductive adhesive to form a first connection area, and the second conductive layer of the second segment is connected to the conductive part by welding or conductive adhesive to form a second connection area.

[0027] Furthermore, the electrode further includes a second insulating layer, which is disposed on the surface of the first connection region away from the first conductive layer and extends in a direction close to the first segment to cover a portion of the surface of the first conductive layer of the second segment away from the first insulating layer and a portion of the surface of the first active material layer away from the first conductive layer; and / or,

[0028] The electrode further includes a third insulating layer disposed on the surface of the second connection area away from the second conductive layer, and extending in a direction close to the first segment to cover a portion of the surface of the second conductive layer away from the first insulating layer and a portion of the surface of the second active material layer away from the second conductive layer in the second segment.

[0029] On the other hand, the present invention also provides a battery, which includes the aforementioned electrode plates.

[0030] Compared to existing technologies, this invention features a dividing slit on the connecting section to divide it into multiple conductive parts. A portion of these conductive parts connects to the first conductive layer, while the remaining parts connect to the second conductive layer. This means that instead of two interconnected conductive structures, only one conductive structure of this invention is needed to connect the first and second conductive layers through the busbar. Furthermore, since the busbar and connecting section are integrally formed, the conductive structure can be relatively thin, significantly reducing the battery volume occupied by the conductive structure. This allows for a larger electrode, thereby increasing the battery's energy density. Additionally, the dividing slit on the connecting section ensures that after the multiple conductive parts connect to the first and second conductive layers, only a small connection gap exists between the busbar and the current collector, thus avoiding the problem of reduced battery space utilization caused by a large connection gap. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the first structure of the electrode sheet disclosed in this utility model.

[0033] Figure 2 This is a schematic diagram of the structure of a second type of electrode sheet disclosed in this utility model;

[0034] Figure 3 This is a cross-sectional view of the third type of electrode disclosed in this utility model;

[0035] Figure 4 This is a cross-sectional view of the fourth type of electrode disclosed in this utility model;

[0036] Figure 5 This is a cross-sectional view of the fifth type of electrode disclosed in this utility model;

[0037] Figure 6This is a cross-sectional view of the sixth type of electrode disclosed in this utility model;

[0038] Figure 7 This is a schematic diagram of the first type of conductive structure disclosed in this utility model.

[0039] Figure 8 This is a schematic diagram of the second type of conductive structure disclosed in this utility model.

[0040] Figure 9 This is a schematic diagram of the third type of conductive structure disclosed in this utility model;

[0041] Figure 10 This is a schematic diagram of the fourth type of conductive structure disclosed in this utility model.

[0042] Figure 11 This is a schematic diagram of the fifth type of conductive structure disclosed in this utility model;

[0043] Figure 12 This is a schematic diagram of the sixth type of conductive structure disclosed in this utility model.

[0044] Figure 13 This is a schematic diagram of the seventh type of conductive structure disclosed in this utility model.

[0045] Figure 14 This is a schematic diagram of the eighth type of conductive structure disclosed in this utility model from a first-view perspective.

[0046] Figure 15 This is a schematic diagram of the eighth type of conductive structure disclosed in this utility model from a second perspective.

[0047] Figure 16 This is a schematic diagram of the ninth type of conductive structure disclosed in this utility model.

[0048] Figure 17 This is a schematic diagram of the tenth type of conductive structure disclosed in this utility model.

[0049] Figure 18 This is a schematic diagram of the eleventh type of conductive structure disclosed in this utility model.

[0050] Figure 19 This is a schematic diagram of the twelfth type of conductive structure disclosed in this utility model.

[0051] Figure 20 This is a schematic diagram of the thirteenth type of conductive structure disclosed in this utility model.

[0052] The above figures include the following reference numerals:

[0053] 10. Conductive structure; 11. Busbar section; 12. Connecting section; 13. Separating seam; 14. Connecting gap; 20. Current collector; 21. First section; 22. Second section; 41. First active material layer; 42. Second active material layer; 51. Second insulating layer; 53. Third insulating layer; 121. First conductive part; 122. Second conductive part; 201. First insulating layer; 202. First conductive layer; 203. Second conductive layer; 1211. First bending member; 1212. First connector; 1213. First connecting area; 1221. Second bending member; 1222. Second connector; 1223. Second connecting area. Detailed Implementation

[0054] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0057] See Figures 1 to 6 As shown, according to an embodiment of the present invention, a battery is provided, the battery including an electrode, wherein the electrode includes a current collector 20 and a conductive structure 10.

[0058] In this invention, the current collector 20 includes a first insulating layer 201, a first conductive layer 202, and a second conductive layer 203. The first conductive layer 202 and the second conductive layer 203 are respectively disposed on two opposite surfaces of the first insulating layer 201. A conductive structure 10 is connected to the current collector 20. The conductive structure 10 includes a connecting segment 12 and a busbar segment 11, which are integrally formed. The connecting segment 12 is disposed at one end near the current collector 20 and extends in a direction away from the current collector 20. The busbar segment 11 is disposed at one end away from the current collector 20 and extends in a direction away from the connecting segment 12. A partition slit 13 is provided on the connecting segment 12 to divide it into multiple conductive portions. A portion of these conductive portions is connected to the first conductive layer 202, and the remaining conductive portions are connected to the second conductive layer 203.

[0059] Compared to existing technologies, in this embodiment, a partition slit 13 is provided on the connecting segment 12 to divide the connecting segment 12 into multiple conductive parts. A portion of these conductive parts is connected to the first conductive layer 202, while the remaining conductive parts are connected to the second conductive layer 203. This means that instead of two interconnected conductive structures 10, only one conductive structure 10 as described in this embodiment is needed to connect the first conductive layer 202 and the second conductive layer 203 through the busbar 11. Furthermore, since the busbar 11 and the connecting segment 12 are integrally formed, the thickness of the conductive structure 10 can be relatively thin, significantly reducing the volume occupied by the conductive structure 10 in the battery. Therefore, the electrode volume can be made relatively larger, thereby increasing the battery's energy density. In addition, because the partition slit 13 is provided on the connecting segment 12, after the multiple conductive parts are connected to the first conductive layer 202 and the second conductive layer 203, only a small connection gap 14 exists between the busbar 11 and the current collector 20. This avoids the problem of reduced battery space utilization caused by a large connection gap 14.

[0060] Furthermore, the conductive portion connected to the first conductive layer 202 includes a first connector 1212 and a first bending member 1211. The first connector 1212 is connected to the first conductive layer 202, and the first bending member 1211 is connected between the first connector 1212 and the busbar 11. The first bending member 1211 is along a first direction (as shown in the attached figure). Figure 3 The first connector 1212 and the busbar 11 are tilted in the X direction so that they are on different planes.

[0061] Specifically, by bending the first bending member 1211 along the first direction, the outer surface of the first connector 1212 is made parallel to the outer surface of the first conductive layer 202, thereby increasing the contact area between the first connector 1212 and the first conductive layer 202 and increasing the connection stability between the first connector 1212 and the first conductive layer 202.

[0062] Similarly, the conductive portion connected to the second conductive layer 203 includes a second connector 1222 and a second bending member 1221. The second connector 1222 is connected to the second conductive layer 203, and the second bending member 1221 is connected between the second connector 1222 and the busbar 11. The second bending member 1221 is inclined in a direction opposite to the first direction so that the second connector 1222 and the busbar 11 are in different planes.

[0063] In addition, as attached Figure 5 To be continued Figure 6 As shown, the conductive portion connected to the first conductive layer 202 includes a first connector 1212 and a first bending member 1211, and the conductive portion connected to the second conductive layer 203 includes a second connector 1222 and a second bending member 1221. While increasing the connection stability between the first connector 1212 and the first conductive layer 202, and between the second connector 1222 and the second conductive layer 203, the size of the connection gap 14 formed between the first bending member 1211, the second bending member 1221, and the current collector 20 can be reduced.

[0064] To ensure the overall strength of the conductive structure 10, in this embodiment, the first bending member 1211 is inclined along the first direction so that the first connector 1212 and the busbar 11 are in different planes, and the second connector 1222 and the busbar 11 are in the same plane.

[0065] Specifically, the setting of the first bending member 1211 will reduce the strength of the conductive structure 10. In order to avoid the strength of the conductive structure 10 being too low, the second connector 1222 and the busbar 11 are on the same plane, thereby reducing the internal stress of the busbar 11 and the second connector 1222.

[0066] Similarly, in another embodiment, the second bending member 1221 is tilted in a direction opposite to the first direction so that the second connector 1222 and the confluence segment 11 are in different planes, and the first connector 1212 and the confluence segment 11 are in the same plane.

[0067] As attached Figure 10 and attached Figure 13 As shown, along the first direction, the projection surface of the conductive structure 10 is a first isosceles trapezoidal surface, and along the second direction, the width of the first isosceles trapezoidal surface gradually decreases.

[0068] Specifically, in this embodiment, the conductive portion has a larger width, resulting in a larger contact area between the conductive portion and the first conductive layer 202, as well as between the conductive portion and the second conductive layer 203. This improves the current transmission efficiency between the composite current collector 20 and the conductive structure 10. Simultaneously, the area of ​​the busbar 11 is smaller than that of a rectangular busbar 11, further improving the space utilization of the battery.

[0069] Furthermore, in some modified embodiments of this embodiment, as shown in the appendix... Figure 11 As shown, along the first direction, the width of the projection surface of the connecting segment 12 is greater than the width of the projection surface of the merging segment 11. The projection surface of the connecting segment 12 is a rectangular surface, while the projection surface of the merging segment 11 is an isosceles trapezoid. The above structure can also achieve the technical effect of this embodiment.

[0070] Optionally, along the first direction, the projection surface of the conductive structure 10 is a rectangular surface. The rectangular surface setting is relatively simple, and when the influence of the partition 13 on the connecting section 12 is not considered, the current carrying capacity of the connecting section 12 is almost the same as that of the busbar 11.

[0071] Optionally, as shown in the appendix Figure 12 As shown, along the first direction, the projection surface of the confluence segment 11 is a second isosceles trapezoidal surface, and along the second direction (as shown in the attached diagram)... Figure 3 In the Y direction, the width of the second isosceles trapezoid gradually increases.

[0072] Specifically, the busbar 11 typically needs to be connected to an adapter plate to control the magnitude of the current entering and exiting the electrode. Without considering production costs and assuming a relatively large electrode, in this embodiment, the contact area between the busbar 11 and the external adapter plate is increased, which improves the current transmission efficiency between the conductive structure 10 and the adapter plate. Similarly, the projection surface of the entire conductive structure 10 in the first direction can also be a third isosceles trapezoidal surface, and along the second direction, the width of the third isosceles trapezoidal surface gradually increases.

[0073] Furthermore, chamfers are provided at the corners of the connecting section 12 and / or the merging section 11.

[0074] It should be noted that "the corners of connecting section 12 and / or busbar section 11 are chamfered" refers to one of three situations: the corner of connecting section 12 is chamfered, the corner of busbar section 11 is chamfered, or both the corners of connecting section 12 and busbar section 11 are chamfered. (See attached document.) Figure 8 and appendix Figure 10 As shown, chamfers are provided at the corners of the connecting section 12 and the bus section 11 to prevent the corners of the conductive structure 10 from being too sharp, which could cause the conductive structure 10 to puncture other components of the battery.

[0075] Furthermore, the minimum width L1 of the partition 13 satisfies the relationship: L1≥0. Specifically, when L1 is greater than 0, no motion interference will occur between two adjacent conductive parts during installation when connecting the conductive structure 10 and the current collector 20. When L1 equals 0, the projected width of the connecting segment 12 in the first direction is less affected by the partition 13.

[0076] In addition, as attached Figure 18 To be continued Figure 19 As shown, the partition joint 13 can be inclined, meaning the angle A between the extension direction of the partition joint 13 and the second direction satisfies the relationship: 0 ≤ A < 90° or 270° < A ≤ 360°. In this embodiment, the value of A can be 0, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 280°, 290°, 300°, 310°, 320°, 330°, 340°, 350°, and 360°. When the relationship 0 ≤ A < 90° is satisfied, the partition joint 13 extends along the third direction (as shown in the attached figure). Figure 17 The partition seam 13 is inclined in the opposite direction to the Z direction, and when the relation 270°<A≤360° is satisfied, the partition seam 13 is inclined in the third direction.

[0077] As attached Figure 7 and appendix Figure 20 As shown, the partition joint 13 includes at least one of two types: a serrated joint and a straight joint.

[0078] Specifically, a serrated gap refers to a gap where the two edges of the partition 13 on the connecting segment 12 are serrated, and the gap between the serrations on opposite sides forms a serrated gap. A straight gap, on the other hand, refers to a gap where the two edges of the partition 13 on the connecting segment 12 are relatively parallel straight lines, and the gap between the straight lines on opposite sides forms a straight gap.

[0079] Furthermore, the partition 13 includes at least one, and when there are multiple partitions 13, the multiple partitions 13 are spaced apart along a third direction to divide the connecting segment 12 into multiple conductive portions.

[0080] Specifically, a portion of the multiple conductive parts can be connected to the first conductive layer 202, while the remaining conductive parts can be connected to the second conductive layer 203. Furthermore, the arrangement of multiple conductive parts and multiple partition slits 13 facilitates improved connection stability between the conductive structure 10 and the current collector 20. That is, multiple connection points are used to balance the external forces exerted by the multiple conductive parts on the first conductive layer 202 and on the second conductive layer 203, thereby improving the stability of the connection between the conductive structure 10 and the current collector 20.

[0081] Furthermore, the portion of the conductive part connected to the first conductive layer 202 is the first conductive part 121, and the portion of the conductive part connected to the second conductive layer 203 is the second conductive part 122. Along the third direction, the first conductive part 121 and the second conductive part 122 are alternately arranged.

[0082] Specifically, in some embodiments, as shown in the appendix Figures 7 to 13 As shown, only one partition 13 is provided, dividing the connecting segment 12 into a first conductive portion 121 and a second conductive portion 122. In other embodiments, as shown in the attached figure... Figure 17As shown, the partition slit 13 includes two or more, with multiple first conductive portions 121 and multiple second conductive portions 121 arranged alternately along a third direction. Of course, the partition slit 13 may also have two, as shown in the attached diagram. Figure 14 To be continued Figure 16 and appendix Figure 18 To be continued Figure 19 Two dividing slits 13 separate the connecting segment 12 into two first conductive portions 121 and one second conductive portion 122, or two second conductive portions 122 and one first conductive portion 121. Furthermore, as shown in the attached... Figures 9 to 11 As shown, in some embodiments, the partition joint may extend to the busbar section.

[0083] As attached Figure 13 As shown, in some embodiments, along the first direction, a portion of the projection surface of the first conductive portion 121 overlaps with a portion of the projection surface of the second conductive portion 122.

[0084] Specifically, a portion of the projection surface of the first conductive part 121 overlaps with a portion of the projection surface of the second conductive part 122. In this embodiment, the projection surfaces of the first conductive part 121 and the second conductive part 122 can be relatively larger, thereby increasing the contact area between the first conductive part 121 and the first conductive layer 202, and between the second conductive part 122 and the second conductive layer 203, to improve the current conduction efficiency between the current collector 20 and the conductive structure 10. Simultaneously, the larger contact area between the current collector 20 and the conductive structure 10 allows for the passage of higher power currents. When a large current passes through the conductive structure 10, it will not cause the conductive structure 10 to melt due to heat, thus preventing potential safety hazards to the battery.

[0085] Furthermore, along the first direction, the area of ​​the projection surface of one of the first conductive part 121 and the second conductive part 122 is greater than or equal to the area of ​​the projection surface of the other one.

[0086] Specifically, in some models of the conductive structure 10, the projected area of ​​the first conductive part 121 is larger than the projected area of ​​the second conductive part 122 along the first direction. In other models of the conductive structure 10, the projected area of ​​the first conductive part 121 is smaller than the projected area of ​​the second conductive part 122 along the first direction. Of course, in still other models of the conductive structure 10, the projected area of ​​the first conductive part 121 is equal to the projected area of ​​the second conductive part 122 along the first direction. By providing various models of the conductive structure 10, different choices can be made to meet the actual needs of the battery. In this embodiment, to ensure the transmission efficiency of the first conductive part 121 and the second conductive part 122, the sum of the projected areas of all the first conductive parts 121 is equal to the sum of the projected areas of all the second conductive parts 122.

[0087] Furthermore, the current collector 20 has a first segment 21 and a second segment 22 connected to each other along the second direction. The surface of the first conductive layer 202 of the first segment 21 away from the first insulating layer 201 is covered with a first active material layer 41, and the surface of the second conductive layer 203 of the first segment 21 away from the first insulating layer 201 is covered with a second active material layer 42. The first conductive layer 202 of the second segment 22 is connected to the conductive part by welding or conductive adhesive to form a first connection area 1213, and the second conductive layer 203 of the second segment 22 is connected to the conductive part by welding or conductive adhesive to form a second connection area 1223.

[0088] Specifically, the first conductive part 121 is connected to the first conductive layer 202, and the second conductive part 122 is connected to the second conductive layer 203. When the battery needs to be charged, current enters through the conductive structure 10, passes through the first conductive part 121 and the second conductive part 122, and enters the first conductive layer 202 and the second conductive layer 203, respectively. The charge is then stored in the first active material layer 41 and the second active material layer 42. When the battery needs to be discharged, the first active material layer 41 and the second active material layer 42 release the charge, and current flows from the first active material layer 41 and the second active material layer 42 through the first conductive part 121 and the second conductive part 122, respectively, and finally flows out through the busbar 11 to the external device. In some embodiments, to ensure the connection strength between the conductive parts on the first connection area 1213 and the second connection area 1223 and the first conductive layer 202 and the second conductive layer 203, the first conductive part 121 and the first conductive layer 202, and the second conductive part 122 and the second conductive layer 203, are all connected by welding. In other embodiments, to avoid the welding affecting the structural strength of the conductive structure 10 and the current collector 20, the first conductive part 121 and the first conductive layer 202 are bonded with conductive adhesive, and the second conductive part 122 and the second conductive layer 203 are bonded with conductive adhesive.

[0089] Furthermore, the electrode also includes a second insulating layer 51, which is disposed on the surface of the first connection area 1213 away from the first conductive layer 202 and extends in a direction close to the first segment 21 to cover the surface of a portion of the first conductive layer 202 away from the first insulating layer 201 and the surface of a portion of the first active material layer 41 away from the first conductive layer 202 in the second segment 22.

[0090] Specifically, covering the surface of the first connection area 1213 away from the first conductive layer 202 with a second insulating layer 51 can prevent the first connection area 1213 from contacting other conductive components of the battery, thus preventing a short circuit. Furthermore, since the outer periphery of the first conductive layer 202 of the first segment 21 is covered with a first active material layer 41, and the stress at the junction of the first segment 21 and the second segment 22 is relatively high due to the end of the first active material layer 41, in this embodiment, the second insulating layer 51 covers the junction and part of the surface of the first active material layer 41, thereby improving the structural strength at the junction of the first segment 21 and the second segment 22.

[0091] Similarly, the electrode also includes a third insulating layer 53, which is disposed on the surface of the second connection area 1223 away from the second conductive layer 203 and extends in a direction close to the first segment 21 to cover a portion of the surface of the second conductive layer 203 of the second segment 22 away from the first insulating layer 201 and a portion of the surface of the second active material layer 42 away from the second conductive layer 203.

[0092] Furthermore, the battery includes multiple stacked electrodes, with a separator between each electrode. When the separator contracts, it may cause a short circuit between two adjacent electrodes, ultimately damaging the battery. However, in this embodiment, because a second insulating layer 51 and a third insulating layer 53 are provided between the conductive structure 10 and the current collector 20, when the separator contracts, the second insulating layer 51 and the third insulating layer 53 contact between two adjacent electrodes, preventing a short circuit between the two electrodes and thus avoiding battery damage.

[0093] In some embodiments, as shown in the appendix Figure 6 As shown, the second insulating layer 51 only covers a portion of the outer surface of the first conductive layer 202 in the second segment 22, and the third insulating layer 53 only covers a portion of the outer surface of the second conductive layer 203 at the second end, in order to reduce the overall weight of the conductive structure 10.

[0094] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0095] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0096] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrode sheet, characterized in that, include: The current collector (20) includes a first insulating layer (201), a first conductive layer (202) and a second conductive layer (203), wherein the first conductive layer (202) and the second conductive layer (203) are respectively disposed on two opposite surfaces of the first insulating layer (201); A conductive structure (10) is connected to the current collector (20). The conductive structure (10) includes a connecting section (12) and a busbar section (11). The connecting section (12) and the busbar section (11) are integrally formed. The connecting section (12) is located at one end close to the current collector (20) and extends in a direction away from the current collector (20). The busbar section (11) is located at one end away from the current collector (20) and extends in a direction away from the connecting section (12). The connecting segment (12) is provided with a partition slit (13), which is used to divide the connecting segment (12) into multiple conductive parts. A portion of the multiple conductive parts is connected to the first conductive layer (202), and the remaining conductive parts are connected to the second conductive layer (203).

2. The electrode sheet according to claim 1, characterized in that, The conductive portion connected to the first conductive layer (202) includes a first connector (1212) and a first bending member (1211). The first connector (1212) is connected to the first conductive layer (202), and the first bending member (1211) is connected between the first connector (1212) and the busbar (11). The first bending member (1211) is inclined along a first direction so that the first connector (1212) and the busbar (11) are in different planes; and / or, The conductive portion connected to the second conductive layer (203) includes a second connector (1222) and a second bending member (1221). The second connector (1222) is connected to the second conductive layer (203), and the second bending member (1221) is connected between the second connector (1222) and the busbar (11). The second bending member (1221) is inclined in a direction opposite to the first direction so that the second connector (1222) and the busbar (11) are in different planes.

3. The electrode sheet according to claim 2, characterized in that, The first bending member (1211) is inclined along the first direction so that the first connecting member (1212) and the confluence section (11) are in different planes, and the second connecting member (1222) is in the same plane as the confluence section (11); or, The second bending member (1221) is tilted in a direction opposite to the first direction so that the second connecting member (1222) and the confluence section (11) are in different planes, and the first connecting member (1212) and the confluence section (11) are in the same plane.

4. The electrode sheet according to claim 1, characterized in that, Along the first direction, the projection surface of the conductive structure (10) is a first isosceles trapezoidal surface, and along the second direction, the width of the first isosceles trapezoidal surface gradually decreases; or, Along the first direction, the projection surface of the confluence segment (11) is a second isosceles trapezoidal surface, and along the second direction, the width of the second isosceles trapezoidal surface gradually increases; or, Along the first direction, the projection surface of the conductive structure (10) is a rectangular surface.

5. The electrode sheet according to claim 1, characterized in that, The minimum width L1 of the separation joint (13) satisfies the following relationship: L1≥0; and / or, The angle A between the extension direction of the separation seam (13) and the second direction satisfies the following relationship: 0 ≤ A < 90° or 270° < A ≤ 360°; and / or, The dividing seam (13) includes at least one of two types: a serrated seam and a straight seam.

6. The electrode sheet according to any one of claims 1 to 5, characterized in that, The partition (13) includes at least one, and when there are multiple partitions (13), the multiple partitions (13) are spaced apart along a third direction to divide the connecting segment (12) into multiple conductive portions.

7. The electrode sheet according to any one of claims 1 to 5, characterized in that, The portion of the conductive part connected to the first conductive layer (202) is the first conductive part (121), and the portion of the conductive part connected to the second conductive layer (203) is the second conductive part (122). Along a third direction, the first conductive part (121) and the second conductive part (122) are alternately arranged.

8. The electrode sheet according to claim 7, characterized in that, Along the first direction, a portion of the projection plane of the first conductive portion (121) overlaps with a portion of the projection plane of the second conductive portion (122); and / or, Along the first direction, the area of ​​the projection surface of one of the first conductive part (121) and the second conductive part (122) is greater than or equal to the area of ​​the projection surface of the other one.

9. The electrode sheet according to any one of claims 1 to 5 or 8, characterized in that, The current collector (20) has a first segment (21) and a second segment (22) connected to each other along the second direction. The first conductive layer (202) of the first segment (21) is covered with a first active material layer (41) on the surface away from the first insulating layer (201), and the second conductive layer (203) of the first segment (21) is covered with a second active material layer (42) on the surface away from the first insulating layer (201). The first conductive layer (202) of the second segment (22) is connected to the conductive part by welding or conductive adhesive to form a first connection area (1213), and the second conductive layer (203) of the second segment (22) is connected to the conductive part by welding or conductive adhesive to form a second connection area (1223).

10. The electrode sheet according to claim 9, characterized in that, The electrode further includes a second insulating layer (51), which is disposed on the surface of the first connection area (1213) away from the first conductive layer (202) and extends in a direction close to the first segment (21) to cover a portion of the surface of the first conductive layer (202) of the second segment (22) away from the first insulating layer (201) and a portion of the surface of the first active material layer (41) away from the first conductive layer (202); and / or, The electrode further includes a third insulating layer (53), which is disposed on the surface of the second connection area (1223) away from the second conductive layer (203) and extends in a direction close to the first segment (21) to cover a portion of the surface of the second conductive layer (203) of the second segment (22) away from the first insulating layer (201) and a portion of the surface of the second active material layer (42) away from the second conductive layer (203).

11. A battery, characterized in that, The battery comprises the electrode sheet according to any one of claims 1 to 10.

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