Electrode plate, battery cell, battery monomer, battery pack and electric equipment

Abstract

The utility model discloses an electrode slice, cell, battery monomer, battery pack and electric equipment, the electrode slice includes: current collector, the current collector is provided with active material coating area, insulating layer area and empty foil area, the insulating layer area is located between the active material coating area and the empty foil area, the current collector is provided with at least one through hole penetrating through the current collector; wherein part of at least part of the through holes is located in the empty foil area, and the other part of the through holes is located in the insulating layer area. According to the utility model, the through holes are formed in the electrode plate, so that electrolyte can enter the electrode plate, and the infiltration effect of the electrode plate is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, in particular to an electrode sheet, a battery core, a battery monomer, a battery pack and electrical equipment. Background Art

[0002] In the related technology, the battery is provided with battery cells, and the battery capacity can be increased by designing the structure of the battery cells or increasing the number of battery cells. In some existing technologies, after the battery cells are wound, since the pole ears are located at both ends of the winding core, during the charging and discharging process, the electrons move a large distance, which increases the resistance and electrochemical polarization. The high-rate charging and discharging performance of this battery cell cannot meet the high-power charging and discharging requirements of the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an electrode sheet. The through hole provided on the electrode sheet designed according to the utility model is conducive to the electrolyte entering the interior of the electrode sheet, thereby improving the infiltration effect of the electrode sheet.

[0004] The utility model also provides a battery core having the electrode sheet.

[0005] The utility model also provides a battery monomer having the battery core.

[0006] The utility model also provides a battery pack having the battery monomer.

[0007] The utility model also provides an electrical device having the battery pack.

[0008] According to the utility model, the electrode sheet includes: a current collector, the current collector is provided with an active material coating area, an insulating layer area and a hollow foil area, the insulating layer area is located between the active material coating area and the hollow foil area, and the current collector is provided with at least one through hole passing through it; wherein at least part of the through hole is located in the hollow foil area and another part is located in the insulating layer area.

[0009] According to the electrode sheet of the utility model, at least part of the through holes are arranged at the connection between the insulating layer area and the empty foil area, so as to improve the injection efficiency of the electrolyte and enhance the wetting effect of the electrode sheet.

[0010] According to some embodiments of the present invention, the current collector is provided with a perforated area, and the perforated area is provided with a plurality of the through holes.

[0011] According to some embodiments of the present invention, the porosity of the perforated area ranges from 15% to 50%.

[0012] According to some embodiments of the present invention, the diameter of the through hole ranges from 0.2 to 2 mm.

[0013] According to some embodiments of the present invention, there is a gap between the through hole and the active material coating area.

[0014] According to some embodiments of the present invention, the distance of the gap is H, and the value range of H is 0-2 mm.

[0015] The following briefly describes the battery cell according to the second embodiment of the utility model.

[0016] The battery cell according to the utility model includes: a positive electrode sheet, a separator and a negative electrode sheet, the positive electrode sheet and the negative electrode sheet are stacked along a first direction, the separator is located between the positive electrode sheet and the negative electrode sheet, and at least one of the positive electrode sheet and the negative electrode sheet is the electrode sheet described in any one of the above embodiments. Since the battery cell according to the utility model is provided with the electrode sheet described in the above embodiments, the battery cell has higher liquid injection efficiency and better wetting effect.

[0017] According to some embodiments of the utility model, the positive electrode sheet and the negative electrode sheet are both the electrode sheets, the through hole of the positive electrode sheet is a first through hole, the porosity of the punching area of ​​the positive electrode sheet is a first porosity, the through hole of the negative electrode sheet is a second through hole, the porosity of the punching area of ​​the negative electrode sheet is a second porosity, the first porosity is greater than the second porosity; and / or the aperture of the first through hole is greater than the aperture of the second through hole.

[0018] The following briefly describes a battery cell according to an embodiment of the third aspect of the present utility model.

[0019] The battery cell according to the utility model comprises: a shell; a battery cell, wherein the battery cell is configured as the battery cell of any one of the above embodiments, and the battery cell is arranged in the shell. Since the battery cell according to the utility model is provided with the battery cell of the above embodiments, the battery cell has higher working efficiency and better heat dissipation effect.

[0020] The following briefly describes a battery pack according to an embodiment of the fourth aspect of the utility model.

[0021] The battery pack according to the present invention comprises: a plurality of battery cells, wherein the battery cells are configured as the battery cells described in any one of the above embodiments. Since the battery pack according to the present invention is provided with the battery cells described in the above embodiments, the battery pack has high working efficiency and good safety performance.

[0022] The following briefly describes the electrical equipment according to the fifth embodiment of the utility model.

[0023] The electric device according to the utility model includes the battery pack described in the above embodiment. Since the electric device according to the utility model is provided with the battery pack described in the above embodiment, the electric device is more efficient and safer to use.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 It is a schematic diagram of the electrode sheet structure according to an embodiment of the utility model.

[0027] Figure 2 It is a schematic diagram of a battery core stacking structure according to an embodiment of the utility model.

[0028] Figure 3 It is a schematic diagram of stacking multiple battery cells according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] 1. Battery cell;

[0031] 10, diaphragm; 20, electrode sheet; 201, positive electrode sheet; 202, negative electrode sheet; 203, tab;

[0032] 21. Active material coating area; 22. Insulation layer area; 23. Empty foil area; 24. Punching area; 241. Through hole. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the related technology, the battery is provided with battery cells, and the battery capacity can be increased by designing the structure of the battery cells or increasing the number of battery cells. In some existing technologies, after the battery cells are wound, since the pole ears are located at both ends of the winding core, during the charging and discharging process, the electrons move a large distance, which increases the resistance and electrochemical polarization. The high-rate charging and discharging performance of this battery cell cannot meet the high-power charging and discharging requirements of the battery.

[0039] Reference below Figure 1 The electrode sheet 20 according to the embodiment of the present invention is described.

[0040] like Figure 1 As shown, the electrode sheet 20 according to the utility model includes: a current collector, the current collector is provided with an active material coating area 21, an insulating layer area 22 and a hollow foil area 23, the active material coating area 21 is provided with an active material layer, the insulating layer area 22 is located between the active material coating area 21 and the hollow foil area 23, and the current collector is provided with at least one through hole 241 passing through it; wherein at least part of the through hole 241 is located in the hollow foil area 23 and the other part is located in the insulating layer area 22.

[0041] In some embodiments, the hollow foil area 23 is disposed adjacent to the insulating layer area 22, and there may be multiple through holes 241 on the current collector. Some of the multiple through holes 241 may be disposed in the hollow foil area 23 or the insulating layer area 22, and other through holes 241 may be disposed at the connection between the hollow foil area 23 and the insulating layer area 22, or multiple through holes 241 may be disposed at the connection between the hollow foil area 23 and the insulating layer area 22. Here, after the electrode sheets 20 are stacked to form the battery cell 1, the through holes 241 may be configured as channels that penetrate the current collector. After the electrolyte is injected, the electrolyte may flow in the channels to wet the electrode sheets 20. The design of the through holes 241 may improve the electrolyte injection efficiency and the wettability of the electrode sheets 20. At the same time, to a certain extent, the channels formed by the through holes 241 may also increase the heat dissipation capacity of the electrode sheets 20.

[0042] It can be understood that when the through hole 241 is only arranged in the insulating layer area 22, due to the limited width of the insulating layer area 22, it is easy to be blocked by other structures. Therefore, there is a situation where the insulating layer area 22 is completely pierced by the through hole 241 or no channel can be formed; and when the through hole 241 is completely arranged in the empty foil area 23, it will affect the wetting effect of the electrolyte on the electrode sheet 20. Therefore, the present application arranges at least part of the through holes 241 at the connection between the insulating layer area 22 and the empty foil area 23. The through holes 241 that penetrate the connection between the insulating layer area 22 and the empty foil area 23 will form a number of channels at the end of the electrode sheet 20, which is beneficial for the electrolyte to enter the interior of the electrode sheet 20 through the gap, and is beneficial to improving the wetting effect of the electrode sheet 20.

[0043] According to the electrode sheet 20 of the present invention, at least part of the through holes 241 are arranged at the connection between the insulating layer area 22 and the hollow foil area 23 to improve the injection efficiency of the electrolyte and enhance the wetting effect of the electrode sheet 20 .

[0044] It is understandable that the present application does not make any specific requirements or special limitations on the method of opening the through hole 241. The punching method disclosed in the prior art or the punching method not disclosed in the new technology can be used to punch holes in the punching area 24. For example, embossing or laser punching can be used.

[0045] In some embodiments, the length of the insulating layer region 22 is smaller than the length of the active material coating region 21 .

[0046] The insulating layer region 22 is suitable for blocking the contact between the negative electrode tab and the positive electrode tab to play an insulating role. In some embodiments, the insulating layer is constructed as a ceramic structure, which can reduce the burrs of the insulating layer, thereby reducing the risk of short circuit.

[0047] In some embodiments, after the electrode sheets 20 of the present application are stacked to form a battery cell 1, the through holes 241 in the electrode sheets 20 are connected one by one to form channels. After injection, the electrolyte can not only flow in the layer to infiltrate the electrode sheets 20 in the layer, but also flow through the channels to other layers to infiltrate other electrode sheets 20, thereby improving the injection efficiency of the electrolyte and the infiltration effect of the electrode sheets 20. Moreover, to a certain extent, the channels formed by the through holes 241 can also increase the heat dissipation capacity of the battery cell 1. The battery cell 1 has a tab 203. During the welding process of the tab 203, the through holes 241 penetrating the insulating layer area 22 and the empty foil area 23 will form a number of gaps at the end of the battery cell 1, which is conducive to the electrolyte entering the battery cell 1 through the gaps, which is conducive to improving the infiltration effect of the battery cell 1. In addition, the length of the tab 203 reduces the transmission distance of electrons and reduces the internal resistance of the battery cell 1.

[0048] In some embodiments, the total thickness of the hollow foil region 23 and the insulating layer region 22 is less than 1 / 2 of the thickness of the electrode sheet 20 .

[0049] According to some embodiments of the present invention, Figure 1 As shown, the current collector is provided with a perforated area 24, and the perforated area 24 is provided with a plurality of through holes 241. In some embodiments, at least part of the connection between the insulating layer area 22 and the hollow foil area 23 is constructed as the perforated area 24. Holes are punched in the perforated area 24 to form channels suitable for the flow of electrolyte, which can improve the effect of the electrolyte infiltrating the electrode sheet 20. This method is low-cost and effective, and can reduce the internal resistance of the battery cell 1 without affecting the capacity of the battery cell 1, and improve the consistency of the internal resistance.

[0050] In some embodiments, the through holes 241 are arranged in rows along the length direction of the perforated area 24 , and at least one row of through holes 241 is arranged in the perforated area 24 .

[0051] It is worth mentioning that the through holes 241 need to be arranged in regular rows, and cannot be randomly distributed. This is because after the electrode sheets 20 are stacked, the through holes 241 in the punching area 24 need to be superimposed to form a through channel. Only regular row distribution can ensure that all through holes 241 can overlap in at least part of the area.

[0052] In some embodiments, the punching area 24 is arranged in the non-ear area of ​​the current collector. By punching holes in the non-ear area, after the electrode sheets 20 are stacked to form a battery cell 1, the through holes 241 are superimposed and penetrated one by one to form channels, thereby promoting the electrolyte to flow into each layer of electrode sheets 20, improving the wetting efficiency and wetting effect of the electrolyte on the electrode sheets 20, and to a certain extent, the channels can also increase the heat dissipation capacity of the battery cell 1.

[0053] In some embodiments, during the welding process of the pole tab 203 , the through holes 241 of the punching area 24 can be overlapped and connected, so that the welding of the pole tab 203 is more firmly performed, thereby improving the welding effect of the pole tab 203 .

[0054] According to some embodiments of the present invention, the porosity of the perforated area 24 ranges from 15% to 50%. It can be understood that the porosity is the percentage of the pore volume in the perforated area 24 to the total volume of the material of the perforated area 24 in the natural state. If there are too many through holes 241 in the perforated area 24, the mechanical strength of the perforated area 24 will be affected. After the tab 203 after lamination is bent, the perforated area 24 will be damaged due to insufficient strength; if there are too few through holes 241 in the perforated area 24, the infiltration effect of the electrolyte will be reduced. Therefore, the porosity of the perforated area 24 is within 15% to 50%, which can provide sufficient mechanical strength while ensuring the electrolyte flow rate to prevent the perforated area 24 at the root of the tab 203 from deforming. Here, the porosity of the perforated area 24 includes but is not limited to 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, and can also be other values ​​not listed.

[0055] According to some embodiments of the present invention, the aperture of the through hole 241 is in the range of 0.2-2 mm. It is understandable that if the through hole 241 in the perforated area 24 is too large, it will affect the mechanical strength of the perforated area 24; if the through hole 241 in the perforated area 24 is too narrow, it will reduce the infiltration effect of the electrolyte. Therefore, the aperture of the through hole 241 is within 0.2-2 mm to provide sufficient mechanical strength while ensuring the electrolyte flow rate and avoid deformation of the perforated area 24. Here, the aperture of the through hole 241 includes but is not limited to 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm, and may also be other values ​​not listed.

[0056] It is worth mentioning that the shape of the through hole 241 can be a parallelogram, a rectangle, an ellipse, a circle, etc., which can be selected according to actual needs and is not limited here.

[0057] According to some embodiments of the present invention, Figure 1 As shown, there is a gap between the through hole 241 and the active material coating area 21 to reduce the risk of short circuit between the positive and negative electrode sheets.

[0058] According to some embodiments of the present invention, Figure 1 As shown, the distance of the gap is H, and the value range of H is 0-2mm. If the through hole 241 is too close to the active material coating area 21, a short circuit will occur between the positive and negative electrode sheets. If the through hole 241 is too far from the active material coating area 21, the punching area 24 will be too wide, thereby causing the electrode sheet 20 to be too thick as a whole. Therefore, the distance of the gap is within 0-2mm. Here, the distance of the gap includes but is not limited to 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2.0mm, and can also be other values ​​not listed.

[0059] The battery cell 1 according to the present utility model is briefly described below.

[0060] like Figure 2As shown, the battery cell 1 according to the utility model includes: a positive electrode sheet 201, a separator 10 and a negative electrode sheet 202, the positive electrode sheet 201 and the negative electrode sheet 202 are stacked along a first direction, the separator 10 is located between the positive electrode sheet 201 and the negative electrode sheet 202, and at least one of the positive electrode sheet 201 and the negative electrode sheet 202 is any one of the electrode sheets 20 described in the above embodiments. In some embodiments, the battery cell 1 is formed by stacking the positive electrode sheet 201, the separator 10 and the negative electrode sheet 202 in sequence. When stacked, as shown in FIG. Figure 2 As shown, the tabs 203 of the positive electrode sheet 201 and the tabs 203 of the negative electrode sheet 202 extend from the edges of both sides of the diaphragm 10, respectively, to form the positive tabs and the negative tabs, respectively. At least part of the punching area 24 of the positive electrode sheet 201 and at least part of the punching area 24 of the negative electrode sheet 202 extend out of the edge of the diaphragm 10 and expose at least part of the through hole 241. After lamination, the through holes 241 are sequentially connected to form a channel for the flow of electrolyte. After lamination, the empty foil area 23 of the positive electrode sheet 201 and the empty foil area 23 of the negative electrode sheet 202 form the current collector connection part of the battery cell 1, and the punching area 24 of the positive electrode sheet 201 and the punching area 24 of the negative electrode sheet 202 form the channel part of the battery cell 1. Since the battery cell 1 according to the utility model is provided with the electrode sheet 20 of the above embodiment, the battery cell 1 has a higher injection efficiency and a better wetting effect.

[0061] When a plurality of positive electrode sheets 201 and a plurality of negative electrode sheets 202 are stacked, as shown in FIG. Figure 3 As shown, the tabs 203 of the plurality of positive electrode sheets 201 extend from one side edge of the diaphragm 10 to form a positive electrode full tab 203, and the tabs 203 of the plurality of negative electrode sheets 202 extend from the other side edge of the diaphragm 10 to form a negative electrode full tab 203. The positive electrode full tab 203 and the negative electrode full tab 203 are distributed on both sides of the diaphragm 10. Compared with the single-sided arrangement of the tab 203, this form has a simpler structure, lower equipment requirements, less heat generation, and higher power density.

[0062] According to some embodiments of the utility model, the positive electrode sheet 201 and the negative electrode sheet 202 are both electrode sheets 20, the through hole 241 of the positive electrode sheet 201 is a first through hole 241, and the porosity of the punching area 24 of the positive electrode sheet 201 is a first porosity, the through hole 241 of the negative electrode sheet 202 is a second through hole 241, and the porosity of the punching area 24 of the negative electrode sheet 202 is a second porosity, and the first porosity is greater than the second porosity; and / or the aperture of the first through hole 241 is greater than the aperture of the second through hole 241. In some embodiments, the active material coating area 21 of the positive electrode sheet 201 is coated with a positive electrode active material, and the current collector of the positive electrode sheet 201 is aluminum foil, and the perforated area 24 of the positive electrode sheet 201 is provided with a first through hole 241 and has a first porosity; the active material coating area 21 of the negative electrode sheet 202 is coated with a negative electrode active material, and the current collector of the negative electrode sheet 202 is copper foil, and the perforated area 24 of the negative electrode sheet 202 is provided with a second through hole 241 and has a second porosity.

[0063] Since the material rolling elongation rate of the positive electrode sheet 201 is higher, during the rolling process, the tab 203 of the positive electrode sheet 201 will be rolled and elongated, and the tension at the edge of the tab 203 cannot be released, so the elongation of the positive electrode full tab 203 and the negative electrode full tab 203 on both sides of the diaphragm 10 is unbalanced, which leads to the edge of the positive electrode sheet 201 being curved due to the high elongation rate, affecting the product yield. Therefore, on the basis of ensuring that the perforated area 24 has sufficient mechanical strength, the first pass The aperture of hole 241 is larger than the aperture of the second through hole 241 and / or the first porosity is larger than the second porosity, so as to open larger or denser through holes 241 on the tab 203 of the positive electrode sheet 201, reduce the stiffness of the tab 203 of the positive electrode sheet 201, effectively release the accumulated stress during the rolling process, balance the rolling deformation of the positive electrode sheet 201 and the negative electrode sheet 202, solve the arc defect at the edge of the tab 203 of the positive electrode sheet 201 due to rolling, and improve the yield rate of the wound battery cell 1.

[0064] In some embodiments, the positive electrode tab and the negative electrode tab extend from the upper and lower ends of the positive and negative electrode sheets 202 in sequence, are bent, and are welded to the current collector using ultrasonic welding.

[0065] In some embodiments, the electrode tab 203 and the current collector are welded by ultrasonic welding, and the energy used in ultrasonic welding is 50 to 1000 W, for example, 50 W, 100 W, 150 W, 200 W, 250 W, 300 W, 350 W, 400 W, 450 W, 500 W, 550 W, 600 W, 650 W, 700 W, 750 W, 800 W, 850 W, 900 W, 950 W or 1000 W, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0066] The battery cell according to the present invention is briefly described below.

[0067] The battery cell according to the utility model comprises: a shell, a battery cell 1, the battery cell 1 is constructed as the battery cell 1 described in any one of the above embodiments, and the battery cell 1 is arranged in the shell. Since the battery cell according to the utility model is provided with the battery cell 1 described in the above embodiments, the battery cell has higher working efficiency and better heat dissipation effect.

[0068] The battery pack according to the present utility model is briefly described below.

[0069] The battery pack according to the present invention comprises: a plurality of battery cells, wherein the battery cells are configured as the battery cells described in any one of the above embodiments. Since the battery pack according to the present invention is provided with the battery cells described in the above embodiments, the battery pack has high working efficiency and good safety performance.

[0070] The electrical equipment according to the utility model is briefly described below.

[0071] The electric device according to the utility model includes the battery pack described in the above embodiment. Since the electric device according to the utility model is provided with the battery pack described in the above embodiment, the electric device is more efficient and safer to use.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0073] Although embodiments of the present invention have been shown and described above, changes, modifications, substitutions and variations may be made to the embodiments described above.

Claims

1. An electrode sheet, characterized in that: include: A current collector, the current collector being provided with an active material coating region (21), an insulating layer region (22) and a hollow foil region (23), the insulating layer region (22) being located between the active material coating region (21) and the hollow foil region (23), and the current collector being provided with at least one through hole (241) penetrating therethrough; wherein At least part of the through holes (241) are partially located in the empty foil area (23) and another part is located in the insulating layer area (22).

2. The electrode sheet according to claim 1, characterized in that: The current collector is provided with a perforated area (24), and the perforated area (24) is provided with a plurality of through holes (241).

3. The electrode sheet according to claim 2, characterized in that: The porosity of the perforated area (24) ranges from 15% to 50%.

4. The electrode sheet according to claim 1, characterized in that: The aperture of the through hole (241) is in the range of 0.2-2 mm.

5. The electrode sheet according to any one of claims 1 to 4, characterized in that: There is a gap between the through hole (241) and the active material coating area (21).

6. The electrode sheet according to claim 5, characterized in that: The distance of the gap is H, and the value range of H is 0-2mm.

7. A battery cell, characterized in that: include: A positive electrode sheet (201), a separator (10) and a negative electrode sheet, wherein the positive electrode sheet (201) and the negative electrode sheet are stacked along a first direction, the separator (10) is located between the positive electrode sheet (201) and the negative electrode sheet, and at least one of the positive electrode sheet (201) and the negative electrode sheet is an electrode sheet (20) according to any one of claims 1 to 6.

8. The battery cell according to claim 7, characterized in that: The positive electrode sheet (201) and the negative electrode sheet are both the electrode sheets (20), the through hole (241) of the positive electrode sheet (201) is a first through hole (241), the porosity of the perforated area (24) of the positive electrode sheet (201) is a first porosity, the through hole (241) of the negative electrode sheet is a second through hole (241), the porosity of the perforated area (24) of the negative electrode sheet is a second porosity, and the first porosity is greater than the second porosity; and / or The aperture of the first through hole (241) is larger than the aperture of the second through hole (241).

9. A battery cell, characterized in that: include: case; A battery cell (1), wherein the battery cell (1) is constructed as the battery cell (1) according to claim 7 or 8, and the battery cell (1) is arranged in the housing.

10. A battery pack, characterized in that: include: A plurality of battery cells, wherein the battery cells are the battery cells according to claim 9.

11. An electrical device, characterized in that: include: The battery pack according to claim 10.

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