Pole piece structure, battery cell and battery
By setting an active material layer on the functional area of the current collector and gradually reducing the depth of the liquid storage pores, the problems of difficult electrolyte storage and loss of active material in lithium-ion batteries are solved, achieving better electrolyte storage and improved energy density.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional vertical drilling methods in lithium-ion batteries make it difficult to store electrolyte and create small gaps in the electrodes near the head folds, while the electrodes near the tail folds are prone to loss of active material.
An active material layer is set on the functional area of the current collector, and liquid storage holes are set at intervals along the winding direction on the side of the active material layer away from the current collector. The depth of the liquid storage holes gradually decreases from the end near the empty foil area to the end away from the empty foil area, adopting a gradient change in drilling depth.
It improves the electrolyte's storage capacity, reduces the risk of black spots/lithium plating on the electrode in the later stages of cycling, reduces the loss of active material, and increases energy density.
Smart Images
Figure CN224501898U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to an electrode structure, a battery cell, and a battery. Background Technology
[0002] Laser drilling has been widely used in lithium-ion batteries due to its ability to increase electrolyte retention and wettability. Currently, the traditional vertical drilling method typically drills to a depth of 20%-50% of the active material layer thickness, with a fixed depth from the beginning to the end of the cell. However, due to the structural characteristics of wound lithium-ion batteries, the electrode corners near the beginning of the cell have smaller angles, making electrolyte storage more difficult and creating smaller gaps, thus the drilling depth cannot meet the requirements. Conversely, the electrode corners near the end of the cell have larger angles and larger gaps, leading to excessive drilling depth and potential loss of active material. Utility Model Content
[0003] The technical problem to be solved by this utility model is: how to solve the problems that electrode sheets near the head folds have more difficulty in storing liquid and have smaller gap space, and electrode sheets near the tail folds are prone to loss of active material.
[0004] To solve the above-mentioned technical problems, this utility model provides an electrode structure, comprising:
[0005] A current collector having a winding direction, the current collector including empty foil areas and functional areas arranged along the winding direction; and,
[0006] An active material layer covers the functional area, and the side of the active material layer away from the current collector is provided with a plurality of liquid storage holes spaced apart along the winding direction;
[0007] The depth of the liquid storage hole gradually decreases from the end near the empty foil area to the end away from the empty foil area.
[0008] More preferably, along the winding direction, the depth difference between two adjacent liquid storage holes satisfies:
[0009] 0 < d n -d m ≤0.01D;
[0010] Where, d n d is the depth of the liquid storage hole near one end of the empty foil area. m D represents the depth of the liquid storage hole at the end furthest from the empty foil area, and D represents the total thickness of the active material layer.
[0011] More preferably, along the winding direction, the active material layer sequentially includes a first region, a second region, and a third region, and each of the first region, the second region, and the third region is provided with a liquid storage hole; the depth of the liquid storage hole in each of the first region, the second region, and the third region gradually decreases from the end near the empty foil area to the end away from the empty foil area.
[0012] More preferably, the minimum depth of the liquid storage hole in the first region is greater than the maximum depth of the liquid storage hole in the second region, and the minimum depth of the liquid storage hole in the second region is greater than the maximum depth of the liquid storage hole in the third region.
[0013] More preferably, the depth of the liquid storage hole in the first region satisfies:
[0014] 0.5D < d 201 ≤0.9D;
[0015] The depth of the liquid storage hole in the second region satisfies:
[0016] 0.2D < d 202 ≤0.5D;
[0017] The relationship between the liquid storage holes in the third region satisfies:
[0018] 0 < d 203 ≤0.2D;
[0019] Wherein, D is the total thickness of the active material layer.
[0020] More preferably, along the winding direction, the length of the first region satisfies: 0 < X1 ≤ 0.3L;
[0021] The length of the third region satisfies: 0 < X3 ≤ 0.2L;
[0022] The length of the second region satisfies: X2 = L - X1 - X3;
[0023] Where L is the total length of the active material layer.
[0024] More preferably, the porosity of the active material layer is 30%-85%.
[0025] More preferably, the current collector is a copper current collector, and the active material layer is a carbon base layer or a silicon base layer.
[0026] This utility model also provides a battery cell, including an anode plate, a cathode plate, and a separator disposed between the anode plate and the cathode plate, wherein the anode plate, the cathode plate, and the separator are wound along the winding direction to form the battery cell;
[0027] The anode sheet is the electrode structure described above.
[0028] This utility model also provides a battery, including a casing and the aforementioned battery cell, wherein the casing covers the battery cell.
[0029] Compared with the prior art, the electrode structure provided by this utility model has the following advantages:
[0030] This invention features an active material layer on the functional area of the current collector, with multiple electrolyte storage holes spaced apart along the winding direction on the side of the active material layer away from the current collector. The depth of the electrolyte storage holes gradually decreases from the end near the empty foil area to the end away from the empty foil area. This gradient drilling method allows for deeper drilling near the electrode head, which can better store electrolyte and reduce the risk of black spots / lithium plating on the electrode in the later stages of cycling. It overcomes the problems of small gap space and more difficult electrolyte storage. The shallower drilling depth near the electrode tail can reduce the loss of active material while meeting certain gap requirements, thereby improving energy density. Attached Figure Description
[0031] Figure 1 This is a top view of the electrode structure described in this utility model.
[0032] Figure 2 This is a schematic diagram of the structure of the active material layer described in this utility model.
[0033] Reference numerals: 10, current collector; 11, empty foil area; 12, functional area; 20, active material layer; 201, first region; 202, second region; 203, third region; 21, liquid storage hole. Detailed Implementation
[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0035] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0038] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0039] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0041] like Figures 1-2 As shown, this utility model provides an electrode structure, including a current collector 10 and an active material layer 20.
[0042] In a specific embodiment, the current collector 10 has a winding direction and includes an empty foil area 11 and a functional area 12 arranged along the winding direction; an active material layer 20 covers the functional area 12, and a plurality of liquid storage holes 21 are provided on the side of the active material layer 20 away from the current collector 10, which are spaced apart along the winding direction; wherein, the depth of the liquid storage holes 21 gradually decreases from the end near the empty foil area 11 to the end away from the empty foil area 11. Therefore, by setting an active material layer 20 on the functional area 12 of the current collector 10, and providing multiple liquid storage holes 21 spaced apart along the winding direction on the side of the active material layer 20 away from the current collector 10, and the depth of the liquid storage holes 21 gradually decreases from the end near the empty foil area 11 to the end away from the empty foil area 11, a drilling method with a gradient change in drilling depth is adopted. The drilling depth near the head of the electrode is set to be deeper, which can better store electrolyte and reduce the risk of black spots / lithium plating on the electrode in the later stage of cycling, overcoming the problems of small gap space and more difficult liquid storage. The drilling depth near the tail of the electrode is set to be shallower, which can reduce the loss of active material while meeting a certain gap, and improve the energy density.
[0043] In some embodiments, along the winding direction, the depth difference between two adjacent liquid storage holes 21 satisfies: 0 < d n -d m ≤0.01D; where d n d represents the depth of the liquid storage hole 21 near one end of the empty foil area 11. m D represents the depth of the liquid storage hole 21 at the end furthest from the empty foil area 11, and D represents the total thickness of the active material layer 20. For example... Figure 2 As shown, 0 < d1 - d2 ≤ 0.01D, 0 < d2 - d3 ≤ 0.01D, 0 < d3 - d4 ≤ 0.01D, 0 < d4 - d5 ≤ 0.01D, 0 < d5 - d6 ≤ 0.01D, 0 < d6 - d7 ≤ 0.01D, 0 < d7 - d8 ≤ 0.01D, 0 < d8 - d9 ≤ 0.01D, ..., and so on, resulting in a gradient change in drilling depth. This means the drilling depth is set deeper near the electrode head and shallower near the electrode tail. Simultaneously, 0 < d... n -d m A value of ≤0.01D ensures the perforation density per unit area, which improves electrolyte wettability.
[0044] In some embodiments, along the winding direction, the active material layer 20 sequentially includes a first region 201, a second region 202, and a third region 203. Each of the first region 201, second region 202, and third region 203 is provided with a liquid storage hole 21. The depth of the liquid storage holes 21 in the first region 201, second region 202, and third region 203 gradually decreases from the end near the empty foil region 11 to the end away from the empty foil region 11. Furthermore, the minimum depth of the liquid storage hole 21 in the first region 201 is greater than the maximum depth of the liquid storage hole 21 in the second region 202, and the minimum depth of the liquid storage hole 21 in the second region 202 is greater than that in the third region 203. The maximum depth of the electrolyte storage holes 21 within region 03; wherein, the first region 201 is the region near the head of the electrode, and the drilling depth of the first region 201 is set to be deeper, which can better store electrolyte and reduce the risk of black spots / lithium plating on the electrode in the later stage of cycling, overcoming the problems of small gap space and more difficult electrolyte storage; the third region 203 is the region near the tail of the electrode, and the drilling depth of the third region 203 is set to be shallower, which can reduce the loss of active material while meeting a certain gap, and improve energy density; while the second region 202 plays a transitional role, and the electrolyte storage holes 21 in this region can increase the electrolyte retention capacity and wettability.
[0045] In some embodiments, D is the total thickness of the active material layer 20, L is the total length of the active material layer 20, and the depth of the liquid storage hole 21 in the first region 201 satisfies: 0.5D < d 201 ≤0.9D; along the winding direction, the length of the first region 201 satisfies: 0<X1≤0.3L; this ensures that the drilling depth near the electrode head is set deeper, which can better store electrolyte and reduce the risk of black spots / lithium plating on the electrode in the later stages of cycling, overcoming the difficulties of small gap space and more difficult electrolyte storage.
[0046] In some embodiments, the relationship between the liquid storage holes 21 in the third region 203 satisfies: 0 < d 203 ≤0.2D, along the winding direction, the length of the third region 203 satisfies: 0<X3≤0.2L; this ensures that the drilling depth near the tail of the electrode is set shallower, which can reduce the loss of active material while meeting a certain gap and improve energy density.
[0047] In some embodiments, the depth of the liquid storage hole 21 within the second region 202 satisfies: 0.2D < d 202 ≤0.5D, along the winding direction, the length of the second region 202 satisfies: X2=L-X1-X3; thereby increasing the electrolyte retention and wettability.
[0048] In some embodiments, the porosity of the active material layer 20 is 30%-85%. When the porosity is below 30%, it restricts electrolyte wetting and lithium-ion diffusion, leading to a decrease in kinetic performance. When the porosity is above 85%, it reduces the mechanical strength of the electrode and decreases the active material loading. The porosity of the active material layer 20, at 30%-85%, ensures effective electrolyte wetting, improves the electrolyte retention performance of the electrode, and simultaneously guarantees both kinetic performance and mechanical strength.
[0049] In some embodiments, the current collector 10 is a copper current collector, specifically a copper foil. The copper foil is flexible and has good conductivity, which allows it to remain intact during the winding process and avoid brittle breakage, thereby ensuring the performance and lifespan of the battery. In addition, the lightweight design of the copper foil also helps to improve the energy density and overall performance of the battery.
[0050] In some embodiments, the active material layer 20 is a carbon substrate or a silicon substrate. A carbon substrate (such as graphite) has small volume changes during charging and discharging, which can maintain the integrity of the electrode structure and prevent the active material from being pulverized and detached, while a silicon substrate has a larger specific capacity, which can significantly improve the battery energy density.
[0051] The following experimental data further illustrates its effect:
[0052] The active material lithium cobalt oxide, the conductive agent acetylene black, the conductive carbon nanotubes, and the binder polyvinylidene fluoride (PVDF) were fully dispersed and uniformly coated on an aluminum current collector in an N-methylpyrrolidone solvent system at a weight ratio of 97.6:0.7:0.4:1.3. The aluminum tabs from Example 1 and Comparative Example 1 were ultrasonically welded onto the aluminum current collector, and then cold-pressed and slit to obtain the cathode electrode.
[0053] Active material graphite, conductive carbon nanotubes, sodium carboxymethyl cellulose, and styrene-butadiene rubber (SBR) emulsion were mixed in deionized water at a weight ratio of 97.2:0.3:1.2:1.3, and the mixture was thoroughly dispersed and uniformly coated onto a copper current collector. The cold-pressed anode sheet was then subjected to laser drilling in different ways to obtain the anode sheets in Example 1 and Comparative Example 1. In Comparative Example 1, conventional depth drilling was performed on the anode active material layer, with the same depth being 40% of the thickness of the anode active material layer. In Example 1, the drilling depth in the first region 201 of the anode active material layer was 0.7D to 0.5D, the drilling depth in the second region 202 was 0.5D to 0.2D, and the drilling depth in the third region 203 was 0.2D to 0. Along the winding direction, the depth of the liquid storage hole 21 in each region gradually decreased from the end closer to the empty foil region 11 to the end farther away from the empty foil region 11.
[0054] The cathode, anode, and separator from Example 1 and Comparative Example 1 were wound to form bare cells, which were then encapsulated and injected with electrolyte to produce finished lithium-ion batteries. The finished batteries were then sent for cycle testing. To ensure the accuracy of the tests, both Example 1 and Comparative Example 1 had three groups: #1, #2, and #3.
[0055] Room temperature cycling test:
[0056] 1. Charge to 4.5V at 1C, cut-off current 0.05C (0.05C means the charging current value is 5% of the battery's rated capacity);
[0057] 2. Discharge at 0.5C to 3.0V;
[0058] 3. Repeat the cycle 500 times, observing the disassembly interface every 100 cycles;
[0059] The results of the loop test are shown in Table 1 below:
[0060] Table 1 Comparison of Cyclic Test Data of Finished Batteries from Example 1 and Comparative Example 1
[0061]
[0062] As shown in Table 1 above, in Comparative Example 1, due to the compression of the corners by graphite expansion in the later stages of cycling, the expansion gap is small and the initial liquid storage at the corners of the electrode with multiple folds is low, leading to premature corner black spots / lithium plating. In contrast, in Example 1, the corner black spots / lithium plating at the electrode head are significantly improved in the later stages of cycling. This is because the drilling depth of the electrode head is deeper, providing more gap space and liquid storage.
[0063] In summary, this invention provides an active material layer 20 on the functional area 12 of the current collector 10, and provides multiple storage holes 21 spaced apart along the winding direction on the side of the active material layer 20 away from the current collector 10. The depth of the storage holes 21 gradually decreases from the end near the empty foil area 11 to the end away from the empty foil area 11. In this way, the drilling depth is varied by a gradient, so that the drilling depth near the electrode head is set deeper, which can better store electrolyte and reduce the risk of black spots / lithium plating on the electrode in the later stage of cycling. This overcomes the problems of small gap space and more difficult electrolyte storage. The drilling depth near the electrode tail is set shallower, which can reduce the loss of active material while meeting a certain gap, and improve the energy density.
[0064] This utility model also provides a battery cell, which includes an anode plate, a cathode plate, and a separator disposed between the anode plate and the cathode plate. The anode plate, cathode plate, and separator are wound along a winding direction to form the battery cell; wherein, the anode plate is the aforementioned electrode structure. The specific structure of this electrode structure is as described in the above embodiments. Since this battery cell adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.
[0065] It should be noted that the battery cell mainly relies on the movement of metal ions between the anode and cathode plates to operate. The anode plate includes an anode current collector 10 and an active material layer 20. The anode current collector 10 has an empty foil area 11 and a functional area 12, and the active material layer 20 is coated on the surface of the functional area 12.
[0066] This utility model also provides a battery, including a casing and the aforementioned battery cell, with the casing covering the battery cell. The specific structure of the battery cell is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.
[0067] A battery is a device that converts chemical energy into electrical energy. It contains an electrolyte solution and metal electrodes, and is housed in a cup, tank, or other container (such as a shell) or a portion of a composite container to generate an electric current. Batteries typically have an anode and a cathode. With technological advancements, the term "battery" now generally refers to any small device capable of generating electrical energy, such as a solar cell. The main performance parameters of a battery include electromotive force, capacity, specific energy, and resistance. The principle of a battery: In a chemical battery, chemical energy is directly converted into electrical energy through spontaneous oxidation and reduction reactions within the battery. These reactions occur at the two electrodes.
[0068] Taking lithium batteries as an example, the cathode current collector can be made of aluminum, and the cathode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The anode current collector can be made of copper, and the anode active material layer can be made of carbon-based materials (such as graphite), silicon-based materials, or alloy materials, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. The electrolyte is a material with good ionic conductivity, such as aqueous solutions of acids, alkalis, and salts, organic or inorganic non-aqueous solutions, molten salts, or solid electrolytes, etc.
[0069] In other embodiments, the battery can be a rechargeable battery, also known as a rechargeable battery or accumulator, which is a battery that can be recharged after being discharged to reactivate the active materials and continue to be used. Utilizing the reversibility of chemical reactions, a new battery can be constructed; that is, after a chemical reaction converts into electrical energy, the electrical energy can be used to repair the chemical system, and then the chemical reaction can be converted back into electrical energy. Therefore, it is called a rechargeable battery.
[0070] This utility model also proposes an electrical device, which includes the battery described above. The specific structure of the battery is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0071] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This embodiment does not impose special limitations on the above-mentioned electrical equipment.
[0072] The above description is merely a preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model. The basic principles, main features, and advantages of this utility model have been shown and described above. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.
[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. An electrode structure, characterized in that, include: A current collector having a winding direction, the current collector including an empty foil area and a functional area arranged along the winding direction; as well as, An active material layer covers the functional area, and the side of the active material layer away from the current collector is provided with a plurality of liquid storage holes spaced apart along the winding direction; The depth of the liquid storage hole gradually decreases from the end near the empty foil area to the end away from the empty foil area.
2. The electrode structure according to claim 1, characterized in that, Along the winding direction, the depth difference between two adjacent liquid storage holes satisfies: 0<d n -d m ≤0.01D; Where, d n d is the depth of the liquid storage hole near one end of the empty foil area. m D represents the depth of the liquid storage hole at the end furthest from the empty foil area, and D represents the total thickness of the active material layer.
3. The electrode structure according to claim 1, characterized in that, Along the winding direction, the active material layer sequentially includes a first region, a second region, and a third region, and each of the first, second, and third regions is provided with a liquid storage hole; the depth of the liquid storage hole in each of the first, second, and third regions gradually decreases from the end closer to the empty foil area to the end farther away from the empty foil area.
4. The electrode structure according to claim 3, characterized in that, The minimum depth of the liquid storage hole in the first region is greater than the maximum depth of the liquid storage hole in the second region, and the minimum depth of the liquid storage hole in the second region is greater than the maximum depth of the liquid storage hole in the third region.
5. The electrode structure according to claim 3, characterized in that, The depth of the liquid storage hole in the first region satisfies: 0.5D<d 201 ≤0.9D; The depth of the liquid storage hole in the second region satisfies: 0.2D<d 202 ≤0.5D; The relationship between the liquid storage holes in the third region satisfies: 0<d 203 ≤0.2D; Wherein, D is the total thickness of the active material layer.
6. The electrode structure according to claim 3, characterized in that, Along the winding direction, the length of the first region satisfies: 0 < X1 ≤ 0.3L; The length of the third region satisfies: 0 < X3 ≤ 0.2L; The length of the second region satisfies: X2 = L - X1 - X3; Where L is the total length of the active material layer.
7. The electrode structure according to claim 1, characterized in that, The porosity of the active material layer is 30%-85%.
8. The electrode structure according to claim 1, characterized in that, The current collector is a copper current collector, and the active material layer is a carbon base layer or a silicon base layer.
9. A battery cell, characterized in that, The battery cell includes an anode plate, a cathode plate, and a separator disposed between the anode plate and the cathode plate, wherein the anode plate, the cathode plate, and the separator are wound along the winding direction to form the battery cell. Wherein, the anode sheet is the electrode structure described in any one of claims 1 to 8.
10. A battery, characterized in that, It includes a housing and the battery cell as described in claim 9, wherein the housing covers the battery cell.