Electrode structure, battery and electric device

Abstract

The utility model discloses an electrode structure, a battery and an electric device. The electrode structure comprises a current collector, a conductive layer and a dressing layer, and a current collector tab is arranged on one side of the current collector. The dressing layer is arranged on at least one side surface of the current collector in the thickness direction. The conductive layer is arranged inside the dressing layer, and / or the conductive layer is arranged on the side, away from the current collector, of the dressing layer, and a conductive layer tab is arranged on one side of the conductive layer. The battery comprises a diaphragm, a positive plate and a negative plate, the positive plate and the negative plate are insulated and separated through the diaphragm, and at least one of the positive plate and the negative plate is the electrode structure. The battery is electrically connected to an electric device so as to provide working current. According to the electrode structure disclosed by the utility model, a new flow path is provided for current in the battery by adding the conducting layer, so that the impedance and heat production of the battery made of the electrode structure are reduced, the single overcurrent capacity of the battery is improved, the stability of the battery is improved, the service life of the battery is prolonged, and the use cost of an electric device is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to an electrode structure, a battery and an electrical device with better service life and performance. Background Art

[0002] In recent years, with the promotion of the national policy of further reducing carbon emissions, lithium-ion batteries, as an energy storage device, play an increasingly important role in the national economy and production and life with their advantages of high cycle performance, high safety and high energy density. At present, the inevitable development trend of lithium-ion batteries is to pursue higher energy density and excellent fast charging performance.

[0003] However, conventional power batteries mostly adopt the design that current flows out from the current collector. The uniqueness of the current outflow path leads to a rapid increase in the internal resistance of the battery cell when the battery is too long or the battery area is too large, and the uneven distribution of the current density of the current collector results in uneven temperature distribution, which is not conducive to the further improvement of battery life, fast charging and other performances. Summary of the Utility Model

[0004] In order to further improve the performance and life of the battery, the embodiments of the present application provide an electrode structure, a battery and an electrical device to solve the above problems.

[0005] In a first aspect, an electrode structure provided by the utility model includes a current collector, a conductive layer and a dressing layer. A current collector tab is arranged on one side of the current collector; the dressing layer is arranged on at least one surface of the current collector in the thickness direction; the conductive layer is arranged inside the dressing layer, and / or, the conductive layer is arranged on the surface of the dressing layer背离 the current collector, and a conductive layer tab is arranged on one side of the conductive layer.

[0006] In some embodiments, the conductive layer is arranged inside the dressing layer, the dressing layer includes a first dressing layer and a second dressing layer, and the current collector, the first dressing layer, the conductive layer and the second dressing layer are sequentially stacked.

[0007] In some embodiments, the thickness of the first dressing layer is D1, and the thickness of the second dressing layer is D2, where 0.3 < D1 / D2 < 0.7, and D1 and D2 are in the same unit.

[0008] In some embodiments, the conductive layer is provided with at least one through hole, the through hole is filled with dressing, and the second dressing layer and the first dressing layer are conductively connected through the dressing.

[0009] In some embodiments, the thickness of the conductive layer is not less than 5μm, and the distance between the through hole of the conductive layer and the edge of the conductive layer is not less than 5mm.

[0010] In some embodiments, the diameter of the through hole is greater than 10 mm.

[0011] In some embodiments, the conductive layer is provided with a plurality of through holes distributed at intervals.

[0012] In some embodiments, the spacing between adjacent through holes is not less than 5 mm.

[0013] In some embodiments, the size of the conductive layer in the first direction is L, and the conductive layer is provided with n through holes in the first direction, and the size of each through hole in the first direction is d2, d2≤(L-(n+1)×5) / n, where the unit of d2 is mm, the unit of L is mm, and n is a natural number not less than 1.

[0014] In some embodiments, the shape of the through hole projected in the thickness direction of the conductive layer is at least one of a circle, an ellipse, a rectangle, a trapezoid and a polygon.

[0015] In some embodiments, the current collector tab and the conductive layer tab are located on the same side of the electrode structure.

[0016] In some embodiments, the current collector tab and the conductive layer tab are located on opposite sides of the electrode structure.

[0017] In a second aspect, the utility model provides a battery, comprising a diaphragm, a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are insulated and separated by the diaphragm, and at least one of the positive electrode sheet and the negative electrode sheet is any of the above-mentioned electrode structures.

[0018] In a third aspect, the utility model provides an electrical device, wherein the battery is electrically connected to the electrical device to provide a working current.

[0019] In summary, the utility model provides an electrode structure, a battery and an electrical device, which provide a new current outflow path by adding a conductive layer, reduce the impedance and heat generation of the battery cell, thereby improving the single-cell current carrying capacity of the battery, and the stability and life of the battery are improved accordingly, thereby reducing the use cost of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0021] Figure 1 It is a structural explosion diagram of the electrode structure provided by the first embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the electrode structure provided by the first embodiment of the utility model;

[0023] Figure 3 It is a schematic structural diagram of the conductive layer provided in the first embodiment of the utility model;

[0024] Figure 4 It is a schematic structural diagram of a conductive layer provided in the second embodiment of the utility model;

[0025] Figure 5 It is a schematic structural diagram of a conductive layer provided in the third embodiment of the utility model;

[0026] Figure 6 is a structural schematic diagram of an electrode structure provided in a fourth embodiment of the present utility model;

[0027] Figure 7 is a structural schematic diagram of an electrode structure provided in a fifth embodiment of the utility model;

[0028] Figure 8 It is a schematic diagram of the structure of the battery cell provided by the embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 100-battery;

[0032] 200-electrode structure;

[0033] 210-Current collector;

[0034] 211-current collector tab;

[0035] 220-conductive layer;

[0036] 221-conductive layer ear;

[0037] 222-through hole;

[0038] 230 - dressing layer;

[0039] 231 - first dressing layer;

[0040] 232 - second dressing layer;

[0041] 240- positive electrode;

[0042] 250-negative electrode;

[0043] 300-diaphragm;

[0044] 400-cell;

[0045] d1-the distance between the through hole of the conductive layer and the edge of the conductive layer;

[0046] d2-the dimension of the through hole in the first direction;

[0047] d3 - spacing between adjacent through holes;

[0048] L-the size of the conductive layer in the first direction;

[0049] D1 - thickness of the first dressing layer;

[0050] D2 - thickness of the second dressing layer;

[0051] D3 - Thickness of the conductive layer. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0053] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0054] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0055] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0056] See also Figure 1 and Figure 2 , Figure 1 is a structural exploded diagram of the electrode structure provided by the first embodiment of the utility model, Figure 2: is a schematic diagram of the structure of the electrode structure provided in the first embodiment of the present invention. The electrode structure 200 provided in the first embodiment of the present invention comprises a current collector 210, a conductive layer 220 and a dressing layer 230. A current collector tab 211 is provided on one side of the current collector 210. The dressing layer 230 is provided on at least one side surface of the current collector 210 in the thickness direction. In this embodiment, the dressing layer 230 is provided on one side surface of the current collector 210. In other embodiments, the dressing layer 230 may also be provided on both side surfaces of the current collector 210. The conductive layer 220 is provided inside the dressing layer 230, and / or the conductive layer 220 is provided on one side surface of the dressing layer 230 away from the current collector 210, and a conductive layer tab 221 is provided on one side of the conductive layer 220. In this embodiment, a conductive layer 220 is provided, and the conductive layer 220 is provided inside the dressing layer 230. In other embodiments, if the conductive layer 220 has only one layer, it can also be arranged on the side of the dressing layer 230 away from the current collector 210; if the conductive layer 220 has multiple layers, the conductive layers 220 can all be arranged inside the dressing layer 230; or the conductive layers 220 are all arranged on the side of the dressing layer 230 away from the current collector 210; or part of the conductive layer 220 is arranged inside the dressing layer 230, and part of the conductive layer 220 is arranged on the side of the dressing layer 230 away from the current collector 210.

[0057] The conductive layer 220 and the current collector 210 are sheet-like or mesh-like structures, made of metals such as copper and aluminum or conductive materials such as carbon, and are used to collect and conduct current. The dressing layer 230 is a multilayer structure composed of active materials, conductive agents, and adhesives. When powered on, an electrochemical reaction can occur to generate current, which is then conducted to the conductive layer 220 and the current collector 210.

[0058] In the conventional electrode structure 200, the dressing layer 230 and the current collector 210 together form a current path. After the current is conducted through the dressing layer 230, the current can only enter and exit the electrode structure 200 from the current collector tab 211, which makes the current collector tab 211 and its vicinity easily heated, thereby damaging the battery 100 or even catching fire. However, the electrode structure 200 provided by the embodiment of the utility model adds a conductive layer 220 with a conductive layer tab 221 to the dressing layer 230, so that after the current is conducted through the dressing layer 230, the current can enter and exit the electrode structure 200 from the conductive layer tab 221 of the conductive layer 220, or from the current collector tab 211 of the current collector 210. On the one hand, multiple current entry and exit paths are provided for the electrode structure 200, so that the current can freely choose the shortest path among them to enter and exit the electrode structure 200, which greatly reduces the impedance of the electrode structure 200 and improves the single-cell performance of the battery 100; on the other hand, the current entry and exit paths of the electrode structure 200 are dispersed to avoid current concentration on the collector pole ear 211, thereby improving the single-cell current carrying capacity of the battery 100.

[0059] In some embodiments, the conductive layer 220 is disposed inside the dressing layer 230. The dressing layer 230 includes a first dressing layer 231 and a second dressing layer 232. The current collector 210, the first dressing layer 231, the conductive layer 220, and the second dressing layer 232 are stacked in sequence. Among them, the material structures of the first dressing layer 231 and the second dressing layer 232 may be the same or different.

[0060] In some embodiments, the thickness of the first dressing layer 231 is D1, and the thickness of the second dressing layer is D2, where 0.3 < D1 / D2 < 0.7, and D1 and D2 are in the same unit, to ensure the strength of the dressing layer 230 itself and the stability of the manufacturing process. In practical applications, according to the different sizes of the electrode structure 200 and the different materials of the dressing layer 230, the thickness of the dressing layer 230 (i.e., the specific values of D1 and D2) can be flexibly adjusted and is not limited to the above dimensions.

[0061] In some embodiments, the conductive layer 220 is provided with at least one through hole 222, and the through hole 222 is filled with a dressing. The first dressing layer 231 and the second dressing layer 232 are conductively connected through the dressing. The dressing is composed of an active material, a conductive agent, and a binder and connects the first dressing layer 231 and the second dressing layer 232 to transmit current. In other embodiments, the conductive layer 220 may also be a complete sheet structure without through holes 222, and the coverage area of the conductive layer 220 is smaller than the coverage area of the current collector 210. The dressing connects the first dressing layer 231 and the second dressing layer 232 from the periphery of the conductive layer 220 to form a current path.

[0062] See Figure 2 and Figure 3 , Figure 3 is a schematic structural diagram of the conductive layer 220 provided by the first embodiment of the present invention. In some embodiments, the thickness D3 of the conductive layer 220 is not less than 5 μm, and the distance d1 between the through hole 222 of the conductive layer 220 and the edge of the conductive layer 220 is not less than 5 mm, to ensure the strength of the conductive layer 220 itself and the stability of the manufacturing process. When the number of through holes 222 is multiple, the distance d1 between the through hole 222 of the conductive layer 220 and the edge of the conductive layer 220 refers to the minimum distance between any through hole 222 and the edge of the conductive layer 220. In practical applications, according to the overall shape of the battery 100 structure and the different materials of the conductive layer 220, the thickness D3 of the conductive layer 220 and the distance d1 between the through hole 222 of the conductive layer 220 and the edge of the conductive layer 220 can be flexibly selected and are not limited to the above dimensions.

[0063] In some embodiments, the aperture of the through hole 222 is greater than 10 mm, where the aperture of the through hole 222 refers to the minimum length of the line connecting the points on the two sides of the shape of the through hole 222 projected in the thickness direction of the conductive layer 220 through the center point of the through hole, for example: when the shape of the through hole 222 projected in the thickness direction of the conductive layer 220 is a circle, the aperture is the diameter of the circle; when the shape of the through hole 222 projected in the thickness direction of the conductive layer 220 is an ellipse, the aperture is the size of the short axis of the ellipse; when the shape of the through hole 222 projected in the thickness direction of the conductive layer 220 is a rectangle, the aperture is the length of the short side of the rectangle. When the aperture of the through hole 222 is greater than 10 mm, the dressing can smoothly connect the first dressing layer 231 and the second dressing layer 232 through the through hole 222 to form a connected power supply path, thereby ensuring the conductive connectivity of the dressing layer 230. In other embodiments, according to the fluidity of the material of the dressing layer 230 and the material of the conductive layer 220 , the aperture of the through hole 222 can be flexibly selected and is not limited to the above-mentioned size.

[0064] In some embodiments, the conductive layer 220 is provided with a plurality of spaced-apart through holes 222, and the dressing passes through the through holes 222 to connect the first dressing layer 231 and the second dressing layer 232 to form a plurality of dispersed current paths, thereby avoiding concentrated heat generation of the current in the dressing layer 230 obtained by combining the first dressing layer 231 and the second dressing layer 232, thereby affecting the battery performance.

[0065] In some embodiments, multiple through holes 222 are evenly distributed on the conductive layer 220. On the one hand, multiple through holes 222 are evenly distributed on the conductive layer 220, so that the current path formed by the dressing passing through the through holes 222 is evenly distributed, so that the current density in the dressing layer 230 obtained by combining the first dressing layer 231 and the second dressing layer 232 is evenly distributed, preventing the current in the dressing layer 230 from concentratedly heating and ensuring the performance of the overall battery 100. On the other hand, multiple through holes 222 are evenly distributed on the conductive layer 220, which simplifies the shape of the conductive layer 220 and reduces the difficulty of processing plasticity of the conductive layer 220. In other embodiments, multiple through holes 222 distributed at intervals can also be unevenly distributed on the conductive layer 220, and the specific uneven distribution method is not limited here.

[0066] In some embodiments, the spacing d3 between adjacent through holes 222 is not less than 5 mm, which ensures the strength of the conductive layer 220 while preventing the connection between different through holes 222, thereby ensuring that the dressing can pass through different through holes 222 to form multiple current paths. In other embodiments, the spacing d3 between adjacent through holes 222 can also be adjusted according to the actual material and shape of the conductive layer 220, and is not limited to the above size.

[0067] In some embodiments, the size of the conductive layer 220 in the first direction is L, and the conductive layer 220 is provided with n through holes 222 in the first direction, and the size of each through hole 222 in the first direction is d2, d2≤(L-(n+1)×5) / n, where the unit of d2 is mm, the unit of L is mm, and n is a natural number not less than 1. Specifically, the size distribution of the conductive layer 220 in the first direction is d1 (the distance between the through hole 222 of the conductive layer 220 and the edge of the conductive layer 220), d2 (the size of the through hole 222 in the first direction), d3 (the distance between adjacent through holes 222), d2, d3, d2...d3, d2, d1. If the conductive layer 220 is provided with n through holes 222 in the first direction, the length L of the first direction dimension of the conductive layer 220 includes the dimension d2 of the n through holes 222 in the first direction, the spacing d3 between (n-1) adjacent through holes 222, and the spacing between the through holes 222 of two conductive layers 220 and the edge of the conductive layer 220, that is, L=n×d2+(n-1)×d3+2×d1, and then d2=(L-(n-1)×d3-2×d1) / n. According to the above, in order to ensure the strength of the conductive layer 220 itself and the stability of the manufacturing process, the spacing d1 between the through holes 222 of the conductive layer 220 and the edge of the conductive layer 220 is not less than 5mm, and the spacing d3 between adjacent through holes 222 is not less than 5mm. Therefore, the dimension d2 of the through hole 222 in the first direction is ≤(L-(n+1)×5) / n.

[0068] In the first embodiment of the utility model, the projection of the conductive layer 220 in the thickness direction is a rectangle, the first direction of the conductive layer 220 is the width direction, the size of the conductive layer 220 in the first direction is the width L of the conductive layer 220 = 80 mm, the conductive layer 220 is provided with 4 through holes 222 in the width direction, the through hole 222 of the conductive layer 220 and the edge spacing d1 of the conductive layer 220 take a minimum value of 5 mm, the spacing d3 between adjacent through holes 222 take a minimum value of 5 mm, then the size d2 of the through hole 222 in the first direction = (80-(4+1)×5) / 4 = 13.75 mm. In other embodiments, according to the actual size of the overall battery 100, the parameters such as the width L of the conductive layer 220, the number n of the through holes 222, the edge spacing d1 of the through hole 222 of the conductive layer 220 and the conductive layer 220, and the spacing d3 between adjacent through holes 222 in the above formula are adjusted accordingly, and the specific size d2 of the through hole 222 in the first direction can be calculated.

[0069] In some embodiments, the shape of the through hole 222 projected in the thickness direction of the conductive layer 220 is at least one of a circle, an ellipse, a rectangle, a trapezoid and a polygon. Figure 3As shown, the projection of the conductive layer 220 in the thickness direction of the first embodiment of the utility model is a rectangle, four circular through holes 222 are arranged in each row at equal intervals in the width direction, and 17 rows of circular through holes 222 are arranged in parallel at equal intervals in the length direction, and all the circular through holes 222 are evenly distributed. Figure 4 As shown, Figure 4 2 is a schematic diagram of the structure of the conductive layer 220 provided in the second embodiment of the present invention. The conductive layer 220 provided in the second embodiment is projected in the thickness direction as a rectangle. In the width direction, each row is a single long rectangular through hole 222. In the length direction, the long rectangular through holes 222 are evenly spaced and parallelly distributed. Figure 5 As shown, Figure 5 : is a schematic diagram of the structure of the conductive layer 220 provided in the third embodiment of the utility model. The projection of the conductive layer 220 provided in the third embodiment in the thickness direction is a rectangle. Three short rectangular through holes 222 are arranged in each row in the width direction. The through holes 222 in each row are arranged in parallel in the length direction, and all the short rectangular through holes 222 are evenly distributed. In other embodiments, the shape of the through hole 222 can be flexibly adjusted to an ellipse, a trapezoid, a triangle, etc. according to the production cost and the process difficulty. The shapes of all the through holes 222 can be the same or partially different.

[0070] See also Figure 1 and Figure 6 In some embodiments, the current collector tab 211 and the conductive layer tab 221 are located on the same side of the electrode structure 200 .

[0071] like Figure 1 As shown, in the first embodiment of the utility model, the current collector tab 211 is arranged at the short side edge of the current collector 210, and the conductive layer tab 221 is arranged at the short side edge of the conductive layer 220, that is, the current collector tab 211 and the conductive layer tab 221 are both located on the short side of the electrode structure 200. The current collector tab 211 and the conductive layer tab 221 are designed to be on the same side relative to the short side of the electrode structure 200. On the one hand, the size of the long side direction of the electrode structure 200 can be fully utilized, which is convenient for expanding the battery capacity or making a laminated core battery; on the other hand, the current collector tab 211 and the conductive layer tab 221 are projected in the thickness direction of the electrode structure 200. The position and size of the projection are the same, so that the current collector tab 211 and the conductive layer tab 221 can be welded to form a single pole, reducing the production cost of the manufactured battery.

[0072] like Figure 6 As shown, Figure 6: is a schematic diagram of the structure of the electrode structure 200 provided in the fourth embodiment of the utility model. In the fourth embodiment of the utility model, the current collector pole ear 211 is arranged at the edge of the long side of the current collector 210, and the conductive layer pole ear 221 is arranged at the edge of the long side of the conductive layer 220, that is, the current collector pole ear 211 and the conductive layer pole ear 221 are both located on the long side of the electrode structure 200. The current collector pole ear 211 and the conductive layer pole ear 221 are designed to be on the same side relative to the long side of the electrode structure 200, which reduces the restrictions on the width of the current collector pole ear 211 and the conductive layer pole ear 221 by other components such as explosion-proof valves when the electrode structure 200 is made into a battery, and then the current collector pole ear 211 and the conductive layer pole ear 221 can be designed to be wider in size to improve the current flow capacity of the battery and reduce the heat generation of the battery pole column. In addition, the design of the current collector pole ear 211 and the conductive layer pole ear 221 on the same side relative to the long side of the electrode structure 200 also helps to uniformize the current density of the battery.

[0073] See also Figure 7 , Figure 7 : is a schematic diagram of the structure of the electrode structure 200 provided in the fifth embodiment of the present utility model, wherein the current collector pole ear and the conductive layer pole ear are located on opposite sides of the electrode structure. The current collector pole ear 211 is arranged at the short side edge of the current collector 210, and the conductive layer pole ear 221 is arranged at the short side edge of the conductive layer 220, that is, the current collector pole ear 211 and the conductive layer pole ear 221 are arranged on opposite short sides of the electrode structure 200. The current collector pole ear 211 and the conductive layer pole ear 221 are designed on both sides of the short side of the electrode structure 200, so that the current collector pole ear 211 and the conductive layer pole ear 221 can be welded to form a pole respectively, and then the flow of current in the battery can have the choice of the direction of the poles on both sides, and the current can choose the shorter path to flow, and the battery impedance is significantly reduced.

[0074] The embodiment of the utility model further provides a battery 100, including a diaphragm 300, a positive electrode sheet 240 and a negative electrode sheet 250, wherein the positive electrode sheet 240 and the negative electrode sheet 250 are insulated and separated by the diaphragm, and at least one of the positive electrode sheet 240 and the negative electrode sheet 250 is any of the above-mentioned electrode structures 200.

[0075] See also Figure 8 , Figure 8It is a schematic diagram of the structure of a battery cell 400 provided in one embodiment of the utility model, including a plurality of separators 300, a plurality of positive electrode sheets 240 and a plurality of negative electrode sheets 250, the positive electrode sheets 240 and the negative electrode sheets 250 are alternately stacked, the positive electrode sheets 240 and the negative electrode sheets 250 are insulated and separated by separators, and at least one positive electrode sheet 240 and / or at least one negative electrode sheet 250 adopts the above-mentioned electrode structure 200. Among them, the separator 300 is made of a polymer or a ceramic material, and has good isolation performance, thermal stability and ion conductivity. The dressing layer 230 of the positive electrode sheet 240 may include at least one of a lithium ion compound and a sodium ion compound, and the dressing layer 230 of the negative electrode sheet 250 may include at least one of a carbon material and a silicon material, and the positive electrode sheet 240, the separator 300, the negative electrode sheet 250, the separator 300, the positive electrode sheet 240, the separator 300, the negative electrode sheet 250, the separator 300...are alternately stacked in sequence to form a battery cell 400. In other embodiments, the battery cell 400 may also be a rolled-up type, with a positive electrode sheet 240, a negative electrode sheet 250 and a separator 300 stacked in sequence and rolled inward to form a spiral structure, and at least one of the positive electrode sheet 240 and / or a negative electrode sheet 250 adopts the above-mentioned electrode structure 200.

[0076] See also Fig. 9 , Fig. 9 : is a schematic diagram of the structure of the battery 100 provided in an embodiment of the utility model. A battery cell 400 is provided in the battery 100, and the battery cell 400 includes a diaphragm 300, a positive electrode sheet 240 and a negative electrode sheet 250. When the battery 100 is connected to the circuit, the lithium ions in the positive electrode sheet 240 are oxidized and release electrons. These electrons flow through the external circuit to generate current. At the same time, the lithium ions in the negative electrode sheet 250 are reduced and absorb electrons. Between the positive electrode sheet 240 and the negative electrode sheet 250, ions are transferred through the diaphragm 300 and the electrolyte to maintain charge balance. This process continues, and the battery 100 will continue to generate current.

[0077] The present invention also provides an electric device (not shown), to which any of the batteries 100 is electrically connected to provide working current. The electric device includes but is not limited to mobile power supplies, mobile phones, laptop computers, electric two-wheelers, electric three-wheelers, electric vehicles, drones and other equipment.

[0078] The above correspondence is not limited to one in practical applications, and users can choose to use one or more of them in combination to enhance personalized experience.

[0079] The above are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. An electrode structure, characterized in that: It includes a current collector, a conductive layer, and a dressing layer. A current collector tab is provided on one side of the current collector. The dressing layer is provided on at least one surface in the thickness direction of the current collector. The conductive layer is provided inside the dressing layer, and / or the conductive layer is provided on one surface of the dressing layer facing away from the current collector. A conductive layer tab is provided on one side of the conductive layer.

2. The electrode structure according to claim 1, characterized in that: The conductive layer is provided inside the dressing layer. The dressing layer includes a first dressing layer and a second dressing layer. The current collector, the first dressing layer, the conductive layer, and the second dressing layer are stacked in sequence.

3. The electrode structure according to claim 2, characterized in that: The thickness of the first dressing layer is D1, and the thickness of the second dressing layer is D2, where 0.3 < D1 / D2 < 0.7, and D1 and D2 are in the same unit.

4. The electrode structure according to claim 2, characterized in that: The conductive layer is provided with at least one through hole, and the through hole is filled with dressing. The second dressing layer and the first dressing layer are electrically connected through the dressing.

5. The electrode structure according to claim 4, characterized in that: The thickness of the conductive layer is not less than 5 μm, and the distance between the through hole of the conductive layer and the edge of the conductive layer is not less than 5 mm.

6. The electrode structure according to claim 4, characterized in that: The aperture of the through hole is greater than 10 mm.

7. The electrode structure according to claim 4, characterized in that: The conductive layer is provided with a plurality of through holes distributed at intervals.

8. The electrode structure according to claim 7, characterized in that: The distance between adjacent through holes is not less than 5 mm.

9. The electrode structure according to claim 4, characterized in that: The size of the conductive layer in the first direction is L. The conductive layer is provided with n through holes in the first direction. The size of each through hole in the first direction is d2, and d2 ≤ (L - (n + 1)×5) / n, where the unit of d2 is mm, the unit of L is mm, and n is a natural number not less than 1.

10. The electrode structure according to claim 4, characterized in that: The shape of the projection of the through hole in the thickness direction of the conductive layer is at least one of a circle, an ellipse, a rectangle, a trapezoid, and a polygon.

11. The electrode structure according to claim 1, characterized in that: The current collector tab and the conductive layer tab are located on the same side of the electrode structure.

12. The electrode structure according to claim 1, characterized in that: The current collector tab and the conductive layer tab are located on opposite sides of the electrode structure.

13. A battery, characterized in that: It includes a separator, a positive electrode sheet, and a negative electrode sheet. The positive electrode sheet and the negative electrode sheet are insulated and separated by the separator. At least one of the positive electrode sheet and the negative electrode sheet is the electrode structure according to any one of claims 1-12.

14. An electrical device, characterized in that: The battery according to claim 13 is electrically connected to the electrical device to provide a working current.

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