Electrode sheet, battery cell, battery, battery pack and electric device

Abstract

An electric device. The electric device comprises a battery pack or batteries, the battery pack comprises batteries, each battery comprises battery cells, each battery cell comprises electrode sheets, and each electrode sheet comprises a current collector and a coating layer. The coating layer is provided on the current collector, a thinned region is formed on the coating layer, and the thickness of the thinned region is less than the thickness of other portions of the coating layer.

Description

Pole piece, battery cell, battery, battery pack and electric equipment

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202422184782.0, filed on September 5, 2024, and entitled "Pole piece, battery cell, battery, battery pack and electric equipment", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a pole piece, a battery cell, a battery, a battery pack and an electric equipment. BACKGROUND

[0004] In the prior art, lithium precipitation is a common abnormal phenomenon of lithium batteries, which can affect the charging efficiency and energy density of lithium ions. In severe cases, lithium precipitation can form lithium crystals, which can pierce the isolation film and cause internal short circuit thermal runaway, seriously endangering the safety of the battery.

[0005] DISCLOSURE

[0006] The present disclosure aims to at least solve one of the technical problems existing in the prior art. To this end, the present disclosure provides a pole piece, the coating layer of which is formed with a thinning area, the thickness of which is less than that of other parts of the coating layer, which can reduce the internal resistance between the current collector and the coating layer, and can also avoid uneven distribution of current density in the local area of the pole piece, thereby preventing the pole piece from producing lithium precipitation.

[0007] The present disclosure further provides a battery cell.

[0008] The present disclosure further provides a battery.

[0009] The present disclosure further provides a battery pack.

[0010] The present disclosure further provides an electric equipment.

[0011] According to the pole piece of the first aspect of the present disclosure, the pole piece comprises a current collector and a coating layer, the coating layer is arranged on the current collector, and the coating layer is formed with a thinning area, the thickness of the thinning area is less than that of other parts of the coating layer.

[0012] Thus, the coating layer of the pole piece is formed with a thinning area, the thickness of the thinning area is less than that of other parts of the coating layer, since the resistance is proportional to the thickness of the material, the reduction of the thickness of the thinning area directly leads to the reduction of the internal resistance between the current collector and the coating layer. Moreover, the existence of the thinning area can shorten the path of lithium ion conduction and improve the migration rate of lithium ions, thereby reducing the internal resistance between the current collector and the coating layer, avoiding uneven distribution of current density in the local area of the pole piece, and preventing the pole piece from generating lithium precipitation.

[0013] According to some embodiments of the present disclosure, the coating layer is arranged on both sides of the current collector, and the coating layer on at least one side is formed with the thinning area.

[0014] According to some embodiments of the present disclosure, the thinning areas of the coating layers on both sides are oppositely arranged in the thickness direction of the current collector.

[0015] According to some embodiments of the present disclosure, the thickness of the thinning area of the coating layer is 0.

[0016] According to some embodiments of the present disclosure, the thinning area is located in the middle of the length direction of the coating layer.

[0017] According to some embodiments of the present disclosure, the surfaces on both sides of the thickness direction of the current collector are planes.

[0018] According to some embodiments of the present disclosure, the thinning area and the corresponding position of the current collector are provided with a channel penetrating in the thickness direction thereof, so that the electrolyte flows through the channel.

[0019] According to some embodiments of the present disclosure, the thinning area and the current collector are formed with the channel on one side in the width direction of the current collector, and the channel is configured as a groove recessed from the edge of the current collector in the width direction to the center of the current collector.

[0020] According to some embodiments of the present disclosure, the thinning area and the current collector are formed with the channel on both sides in the width direction of the current collector, and the channels on both sides are symmetrically arranged about the center line in the width direction of the current collector.

[0021] According to some embodiments of the present disclosure, the channel is configured as a rectangular slot with equal width; or the channel is configured as an arc-shaped slot with width decreasing from the edge of the current collector in the width direction to the center width of the current collector.

[0022] According to some embodiments of the present disclosure, the channel is configured as a plurality of through holes, and the plurality of through holes are distributed at intervals on the corresponding positions of the thinning area and the current collector.

[0023] According to some embodiments of the present disclosure, in the length direction of the current collector, the size of the thinning region is L1, the size of the current collector is L2, and L1 and L2 satisfy the relationship: 0.01 < L1 / L2 < 0.3.

[0024] According to some embodiments of the present disclosure, the surface area of the thinning region on one side of the thickness direction of the current collector is S1, the surface area on the other side of the thickness direction of the current collector is S2, and S1 and S2 satisfy the relationship: 0.01 < S1 / S2 < 0.2.

[0025] According to some embodiments of the present disclosure, the surface area of the portion of the current collector corresponding to the thinning region on one side of the thickness direction is S1, and the area of the channel is S3, and S1 and S3 satisfy the relationship: 0.05 < S3 / S1 < 1.

[0026] According to some embodiments of the present disclosure, one end of the current collector is provided with a first tab, and the other end is provided with a second tab, the polarities of the first tab and the second tab are the same, and the first tab and the second tab are symmetrically arranged about the center of the current collector.

[0027] According to the second aspect of the present disclosure, the electrode core comprises: a plurality of the above-mentioned electrode sheets; and a plurality of separators, the separators and the plurality of electrode sheets are stacked in the thickness direction of the separators.

[0028] According to the third aspect of the present disclosure, the battery comprises: the above-mentioned electrode core.

[0029] According to the fourth aspect of the present disclosure, the battery pack comprises: the above-mentioned battery.

[0030] According to the fifth aspect of the present disclosure, the power consuming device comprises: the above-mentioned battery or the above-mentioned battery pack.

[0031] Additional aspects and advantages of the present disclosure will be in part apparent and in part pointed out hereinafter in the description of embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or additional aspects and advantages of the present disclosure will become apparent and be readily appreciated from the description of embodiments of the present disclosure, taken in conjunction with the following drawings in which:

[0033] FIG. 1 is a schematic structural diagram of the electrode core in which the electrode sheets are stacked according to an embodiment of the present disclosure;

[0034] FIG. 2 is a schematic structural diagram of an electrode sheet according to an embodiment of the present disclosure;

[0035] FIG. 3 is a schematic structural diagram of an electrode sheet according to another embodiment of the present disclosure;

[0036] FIG. 4 is a structural schematic diagram of a pole piece according to yet another embodiment of the present disclosure;

[0037] FIG. 5 is a structural schematic diagram of a battery according to an embodiment of the present disclosure;

[0038] FIG. 6 is a top view of a battery according to an embodiment of the present disclosure;

[0039] FIG. 7 is a side view of one side of a battery according to an embodiment of the present disclosure;

[0040] FIG. 8 is a schematic block diagram of a battery according to an embodiment of the present disclosure;

[0041] FIG. 9 is a schematic block diagram of a battery pack according to an embodiment of the present disclosure;

[0042] FIG. 10 is a schematic block diagram of an electrical device according to an embodiment of the present disclosure;

[0043] FIG. 11 is another schematic block diagram of an electrical device according to an embodiment of the present disclosure.

[0044] Reference signs: 2000, electrical device; 1000, battery pack; 100, pole piece; 10, current collector; 13, thinning area; 131, channel; 132, through hole; 20, coating layer; 30, first tab; 31, second tab; 40, battery cell; 41, separator; 50, battery; 60, pole; 61, positive pole; 62, negative pole. DETAILED DESCRIPTION

[0045] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0046] A pole piece 100 according to an embodiment of the present disclosure is described below with reference to FIGS. 1-7.

[0047] Referring to FIGS. 1 and 2, the pole piece 100 of the first aspect embodiment of the present disclosure includes a current collector 10 and a coating layer 20, the coating layer 20 is disposed on the current collector 10, the coating layer 20 is formed with a thinning area 13, the thickness of the thinning area 13 is less than the thickness of other parts of the coating layer 20.

[0048] Specifically, in a conventional battery, because the curvature radius of the outer positive pole piece bending area is greater than that of the inner negative pole piece, the space for embedding the lithium ions that are stripped out of the positive pole piece on the negative pole piece is insufficient, which is prone to lithium precipitation. Therefore, the opening area is added through the current collector in the bending area, so that the lithium ions can flow from the coating area on one side of the current collector to the coating area on the other side and then be embedded, which improves the insufficient space for embedding lithium in the bending area of the negative pole piece. However, the other parts of the bending area except the opening area can still perform embedding and stripping of lithium ions, and the problem of lithium precipitation still exists.

[0049] However, the reason for causing lithium precipitation of the pole piece is different, because the internal resistance of the current collector and the coating layer exists, causing uneven distribution of current density in the local area of the pole piece, when the local current density of the pole piece is too large, it will lead to the problem of lithium deposition.

[0050] Therefore, the coating layer 20 is formed with a thinning area 13, the thickness of the thinning area 13 is smaller than the thickness of other parts of the coating layer 20. According to Ohm's law, the resistance is proportional to the thickness of the material, therefore, the thickness reduction of the thinning area 13 will directly lead to the reduction of the internal resistance between the current collector 10 and the coating layer 20. Moreover, the existence of the thinning area 13 can shorten the path of lithium ion conduction, thereby improving the migration rate of lithium ions, so as to reduce the internal resistance between the current collector 10 and the coating layer 20. In this way, the internal resistance between the current collector 10 and the coating layer 20 can be reduced, so as to avoid uneven distribution of current density in the local area of the pole piece 100, and prevent the pole piece 100 from generating lithium precipitation.

[0051] Therefore, the coating layer 20 of the pole piece 100 is formed with a thinning area 13, the thickness of the thinning area 13 is smaller than the thickness of other parts of the coating layer 20, which can reduce the internal resistance between the current collector 10 and the coating layer 20, and avoid uneven distribution of current density in the local area of the pole piece 100, thereby preventing the pole piece 100 from generating lithium precipitation.

[0052] According to some embodiments of the present disclosure, the coating layer 20 is arranged on both sides of the current collector 10, and at least one side of the coating layer 20 is formed with a thinning area 13.

[0053] Specifically, at least one side of the coating layer 20 is formed with a thinning area 13, that is, one side surface of the current collector 10 is formed with a thinning area 13, so that the internal resistance between one side surface of the current collector 10 and the coating layer 20 can be reduced, thereby avoiding uneven distribution of current density in the area between one side surface of the current collector 10 and the coating layer 20.

[0054] Alternatively, both sides of the current collector 10 are formed with a thinning area 13, which can further reduce the internal resistance between both sides of the current collector 10 and the coating layer 20.

[0055] According to some embodiments of the present disclosure, the thinning areas 13 of the coating layers 20 on both sides are oppositely arranged in the thickness direction of the current collector 10. In this way, the thinning areas 13 help to optimize the current distribution on both sides of the current collector 10, thereby improving the conductivity and reducing the resistance loss.

[0056] According to some embodiments of the present disclosure, the thickness of the thinning area 13 is 0.

[0057] When the thickness of the thinning area 13 is 0, that is, there is no dressing on the position of the thinning area 13 corresponding to the current collector 10, thus, by removing the dressing on the surface of the current collector 10, it can directly prevent lithium from being inserted and extracted, and only allow electrons to pass through, so as to prevent the generation of lithium precipitation of the pole piece 100.

[0058] According to some embodiments of the present disclosure, as shown in FIG. 2, the thinning area 13 is located in the middle of the length direction of the dressing layer 20.

[0059] Specifically, the pole piece 100 with the two head tabs is the place with the largest current density in the middle of the length direction, and is more likely to produce lithium precipitation. Due to the internal resistance of the current collector 10 and the dressing, the potential and current density of each part are inconsistent, and when the battery 50 is longer, the difference will be more obvious. The electrons flow from both ends to the middle in the length direction of the battery 50, so in the charging process, the thinning area 13 is the position with the largest current density, and is easy to cause lithium deposition to form dendrites, affecting the energy efficiency and service life of the battery 50. Therefore, the thinning area 13 is arranged in the middle of the length direction of the dressing layer 20, so that only electrons can pass through at this position, and lithium ions cannot be inserted and extracted, thereby avoiding lithium precipitation in this area.

[0060] According to some embodiments of the present disclosure, the thinning area 13 and the corresponding position of the current collector 10 are provided with a channel 131 penetrating along the thickness direction thereof, so that the electrolyte can flow through the channel 131.

[0061] The dressing layer 20 is formed by mixing active material, conductive agent and binder, and is coated on the current collector 10. The thinning area 13 and the corresponding position of the current collector 10 are provided with a channel 131 penetrating along the thickness direction thereof, so that the lithium ions can flow smoothly. The penetrating channel 131 can make the lithium ions flow on both sides of the pole piece 100, so as to better balance the electrolyte concentration on both sides of the pole piece 100, and also make the electrolyte on both sides of the pole piece 100 evenly distributed, thereby avoiding lithium precipitation.

[0062] According to some embodiments of the present disclosure, as shown in FIG. 1, the surfaces on both sides of the thickness direction of the current collector 10 are flat.

[0063] The surfaces on both sides of the thickness direction of the current collector 10 are arranged as flat surfaces, which can increase the contact area between the dressing layer 20 and the surfaces on both sides of the current collector 10, and also make the current density in the current collector 10 more uniform.

[0064] According to some embodiments of the present disclosure, as shown in FIG. 1 and FIG. 2, the thinning area 13 and the current collector 10 are provided with a channel 131 on one side of the width direction of the current collector 10, and the channel 131 is configured as a groove recessed from the edge of the current collector 10 in the width direction to the center of the current collector 10.

[0065] The electrolyte in the channel 131 can flow from one side edge of the width direction of the current collector 10 to the center of the current collector 10, so that the flow of the electrolyte can be increased, and thus the pole piece 100 can be fully soaked.

[0066] According to some embodiments of the present disclosure, as shown in FIG. 2, the thinning area 13 and the current collector 10 are formed with channels 131 on both sides of the width direction of the current collector 10, and the channels 131 on both sides are symmetrically arranged about the center line of the width direction of the current collector 10.

[0067] The symmetrically arranged channels 131 can ensure the flow of the electrolyte from both sides of the width direction of the current collector 10, and can also avoid uneven distribution of the electrolyte in the width direction of the current collector 10 caused by excessive flow on one side. Moreover, the symmetrically arranged channels 131 can make the pressure distribution of the electrolyte entering both sides of the width direction of the current collector 10 more uniform.

[0068] According to some embodiments of the present disclosure, as shown in FIG. 2 and FIG. 3, the channel 131 is configured as a rectangular groove with equal width, or the channel 131 is configured as an arc-shaped groove decreasing in width from one side edge of the width direction of the current collector 10 to the center of the current collector 10.

[0069] The rectangular groove channel 131 with equal width can ensure uniform flow of the electrolyte in the channel 131.

[0070] In addition, the arc-shaped groove channel 131 decreases in width from one side edge of the width direction of the current collector 10 to the center of the current collector 10, which can reduce the turbulence and vortex of the electrolyte, and thus can reduce energy loss.

[0071] According to some embodiments of the present disclosure, as shown in FIG. 4, the channel 131 is configured as a plurality of through holes 132, and the plurality of through holes 132 are distributed at intervals on the corresponding positions of the thinning area 13 and the current collector 10.

[0072] The plurality of through holes 132 can facilitate the formation of a plurality of electrolyte channels 131 in the thinning area 13, and the electrolyte of the plurality of through holes 132 can flow uniformly in the thinning area 13, so that the local pressure of the thinning area 13 caused by the concentration of the electrolyte at a certain point can be avoided.

[0073] Moreover, the plurality of through holes 132 can further increase the flow of the electrolyte, so that the two sides of the pole piece 100 can be fully soaked.

[0074] According to some embodiments of the present disclosure, as shown in FIG. 2, in the length direction of the current collector 10, the size of the thinning area 13 is L1, and the size of the current collector 10 is L2, and L1 and L2 satisfy the relationship: 0.01 < L1 / L2 < 0.3.

[0075] The size of the thinning region 13 can be set according to the length of the current collector 10, and the size L1 of the thinning portion and the size L2 of the current collector 10 satisfy 0.01 < L1 / L2 < 0.3, so that the uneven distribution of current density on the pole piece 100 can be avoided to cause lithium precipitation in the thinning region 13, and the length of the thinning region 13 can also be avoided to be too large to cause loss of energy density.

[0076] According to some embodiments of the present disclosure, as shown in FIG. 2, the surface area of the thinning region 13 on one side of the thickness direction of the current collector 10 is S1, and the surface area on the other side of the thickness direction of the current collector 10 is S2, and S1 and S2 satisfy the relationship: 0.01 < S1 / S2 < 0.2.

[0077] The surface area S1 of the thinning region 13 on one side of the thickness direction of the current collector 10 is less than the surface area S2 on the other side of the thickness direction of the current collector 10, and when the surface area S1 of the thinning region 13 on one side of the thickness direction of the current collector 10 and the surface area S2 on the other side of the thickness direction of the current collector 10 satisfy 0.01 < S1 / S2 < 0.2, for example, S1 / S2 is 0.015, so that the current density of the pole piece 100 can be more uniform.

[0078] According to some embodiments of the present disclosure, as shown in FIG. 2, the surface area of the portion of the current collector 10 corresponding to the thinning region 13 on one side of the thickness direction is S1, and the area of the channel 131 is S3, and S1 and S3 satisfy the relationship: 0.05 < S3 / S1 < 1.

[0079] When the surface area S1 of the portion of the current collector 10 corresponding to the thinning region 13 on one side of the thickness direction and the area S3 of the channel 131 satisfy 0.05 < S3 / S1 < 1, the smooth flow of lithium ions in the channel 131 can be facilitated, so that the concentration of electrolyte on both sides of the pole piece 100 can be balanced.

[0080] According to some embodiments of the present disclosure, as shown in FIG. 2, one end of the current collector 10 is provided with a first tab 30, and the other end of the current collector 10 is provided with a second tab 31, the polarities of the first tab 30 and the second tab 31 are the same, and the first tab 30 and the second tab 31 are symmetrically arranged about the center of the current collector 10.

[0081] The polarities of the first and second tabs 30 and 31 are the same, and when the polarities of the first and second tabs 30 and 31 are set to be positive, the tab 100 can be formed as a positive tab; when the polarities of the first and second tabs 30 and 31 are set to be negative, the tab 100 can be formed as a negative tab. The positive electrode of the current collector 10 can be set to be aluminum, and the negative electrode can be set to be copper. When the positive and negative tabs are stacked, the flow path of electrons can be shortened by half, thereby reducing the internal resistance of the battery 50.

[0082] The battery 50 according to the second aspect of the present disclosure includes a plurality of the tab 100 according to the above-mentioned embodiments and a plurality of the separator 41, and the separator 41 and the plurality of the tab 100 are stacked in the thickness direction of the separator 41.

[0083] The battery 50 according to the second aspect of the present disclosure includes a plurality of the tab 100 according to the above-mentioned embodiments and a plurality of the separator 41, and the separator 41 and the plurality of the tab 100 are stacked in the thickness direction of the separator 41.

[0084] The battery 50 according to the third aspect of the present disclosure includes the battery cell 40 according to the above-mentioned embodiments, as shown in FIG. 8. The battery cell 40 in the battery 50 can be a single battery cell or a plurality of battery cells.

[0085] As shown in FIGS. 5-7, the battery 50 is provided with a pole 60, and the pole 60 includes a positive pole 61 and a negative pole 62. The positive pole 61 and the negative pole 62 are arranged on the same side of the battery 50, which can reduce the risk of misconnection and can reduce the risk of short circuit or other electrical faults caused by incorrect connection.

[0086] The battery pack 1000 according to the fourth aspect of the present disclosure includes the battery 50 according to the above-mentioned embodiments, as shown in FIG. 9. The tab 100 is suitable not only for a stacked battery but also for a wound battery.

[0087] The electrical equipment 2000 according to the fifth aspect of the present disclosure includes the battery pack 1000 according to any one of the above-mentioned embodiments (as shown in FIG. 10) or the battery 50 according to any one of the above-mentioned embodiments (as shown in FIG. 11).

[0088] In the description of the disclosure, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the disclosure.

[0089] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0090] Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A pole piece (100), characterized in that, The application relates to a battery, which comprises: a current collector (10); and a coating layer (20) arranged on the current collector (10), the coating layer (20) being formed with a thinned area (13) having a thickness smaller than that of other parts of the coating layer (20).

2. The pole piece (100) according to claim 1, characterized in that The coating layer (20) is arranged on both sides of the current collector (10), and the coating layer (20) on at least one side is formed with the thinned area (13).

3. The pole piece (100) according to claim 2, characterized in that The thinned areas (13) of the coating layers (20) on both sides are oppositely arranged in the thickness direction of the current collector (10).

4. The pole piece (100) according to any one of claims 1-3, characterized in that, The thickness of the coating at the thinned area (13) is 0.

5. The pole piece (100) according to any one of claims 1-4, characterized in that, The thinned area (13) is located in the middle of the length direction of the coating layer (20).

6. The pole piece (100) according to any one of claims 1-5, characterized in that, The surfaces on both sides of the thickness direction of the current collector (10) are flat.

7. The pole piece (100) according to any one of claims 1-6, characterized in that, The thinned area (13) and the corresponding position of the current collector (10) are provided with a channel (131) penetrating in the thickness direction thereof, so that electrolyte flows through the channel (131).

8. The pole piece (100) according to claim 7, characterized in that The thinned area (13) and the current collector (10) are formed with the channel (131) on one side in the width direction of the current collector (10), and the channel (131) is configured as a groove recessed from the edge of the current collector (10) on one side in the width direction to the center of the current collector (10).

9. The pole piece (100) according to claim 7 or 8, characterized in that The thinned area (13) and the current collector (10) are formed with the channel (131) on both sides in the width direction of the current collector (10), and the channels (131) on both sides are symmetrically arranged about the center line in the width direction of the current collector (10).

10. The pole piece (100) according to any one of claims 7-9, characterized in that, The channel (131) is configured as a rectangular slot with equal width; or The channel (131) is configured as an arc-shaped slot with width decreasing from the edge of the current collector (10) on one side in the width direction to the center of the current collector (10).

11. The pole piece (100) according to any one of claims 7-10, characterized in that The channel (131) is configured as a plurality of through holes (132) distributed at intervals on the thinned area (13) and the corresponding position of the current collector (10).

12. The pole piece (100) according to any one of claims 1-11, characterized in that In the length direction of the current collector (10), the size of the thinned area (13) is L1, and the size of the current collector (10) is L2, and L1 and L2 satisfy the relationship: 0.01 < L1 / L2 < 0.

3.

13. The pole piece (100) according to any one of claims 1-12, characterized in that, The surface area of the thinned area (13) on one side in the thickness direction of the current collector (10) is S1, and the surface area on the other side in the thickness direction of the current collector (10) is S2, and S1 and S2 satisfy the relationship: 0.01 < S1 / S2 < 0.

2.

14. The pole piece (100) according to any one of claims 7-11, characterized in that, The surface area of the part of the current collector (10) corresponding to the thinned area (13) on one side in the thickness direction is S1, and the area of the channel (131) is S3, and S1 and S3 satisfy the relationship: 0.05 < S3 / S1 < 1.

15. The pole piece (100) according to any one of claims 1-14, characterized in that, One end of the current collector (10) is provided with a first tab (30), and the other end is provided with a second tab (31), the polarities of the first tab (30) and the second tab (31) are the same, and the first tab (30) and the second tab (31) are symmetrically arranged about the center of the current collector (10).

16. An electric cell (40) characterized by, The application relates to a battery, which comprises: A plurality of the pole piece (100) according to any one of claims 1-15; And A plurality of separators (41) are stacked in the thickness direction of the separators (41) with a plurality of the pole pieces (100).

17. A battery (50) characterized by Including: The battery cell (40) according to claim 16.

18. A battery pack (1000), characterized by, Including: The battery (50) according to claim 17.

19. An electrical device (2000), characterized by Including: The battery (50) according to claim 17 or the battery pack (1000) according to claim 18.

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