Composite negative plate, battery monomer, battery and power utilization device

Abstract

The utility model relates to a composite negative plate, a battery monomer, a battery and an electric device. The composite negative plate comprises a negative plate body, the lithium foil is attached to the negative plate body and is used for supplementing lithium to the negative plate body; and the bonding layer is arranged between the negative plate body and the lithium foil and is used for bonding the negative plate body and the lithium foil. According to the composite negative plate, the battery monomer, the battery and the electric device, the phenomenon that the lithium foil compounded on the surface of the negative plate is not uniform due to layering of the negative plate and the lithium foil can be reduced, and the lithium supplementing effect of a battery cell can be improved.

Description

Technical Field

[0001] The utility model relates to the fields of composite negative electrode sheets, battery cells, batteries and electrical devices, in particular to a composite negative electrode sheet, battery cells, batteries and electrical devices. Background Art

[0002] The pole piece is one of the important components of the battery cell. Usually, the negative pole pieces cut to the size of the battery cell are alternately stacked with the positive pole pieces and separators to form a laminated battery cell, or the negative pole pieces of a certain length are cross-stacked with the positive pole pieces and separators and then rolled up from one end to form a rolled battery cell. After the preparation of the battery cell is completed, the battery cell is placed in a metal casing, and after the electrolyte is injected into the metal casing, a battery capable of powering external electrical appliances can be made. However, the above-mentioned winding process has certain requirements on the length of the pole piece. When preparing the pole piece, even a tiny defect on the pole piece will make the section of the pole piece unusable, resulting in a huge waste of raw materials.

[0003] Lithium replenishment is to add lithium to the inside of the lithium-ion battery to replenish lithium ions before the lithium-ion battery works. The electrode material is replenished with lithium by pre-lithiation to offset the irreversible lithium loss, so as to increase the total capacity and energy density of the battery. Usually, negative electrode lithium replenishment is used in the battery cell manufacturing process. Specifically, negative electrode lithium replenishment refers to the introduction of active lithium into the negative electrode to compensate for its capacity loss caused by the growth of the solid electrolyte interface (SEI). Physical mixing refers to pressing the lithium sheet on the surface of the negative electrode sheet to compensate for the loss of active lithium. Physical mixing usually uses a cold rolling process to press the lithium sheet on the surface of the negative electrode sheet. In this process, the amount of lithium replenishment must be strictly controlled. If the amount of lithium replenishment is too much, lithium dendrites will be caused, which will bring safety hazards to the battery. Therefore, the lithium sheet used for negative electrode lithium replenishment is usually thinner. However, affected by factors such as processing technology and equipment, the bonding effect of this ultra-thin lithium foil and the negative electrode sheet is not good, which easily leads to uneven lithium foil compounded on the surface of the negative electrode sheet, resulting in defects on the surface of the electrode sheet, affecting the lithium replenishment effect, and also affecting the production quality of the electrode sheet and the battery cell, thereby causing great waste of raw materials. Utility Model Content

[0004] Based on this, it is necessary to provide a composite negative electrode sheet, battery cell, battery and electrical device that can improve the uniformity of the composite of lithium foil and electrode sheet and enhance the lithium replenishment effect in order to address the above problems.

[0005] In a first aspect, a composite negative electrode sheet is provided, wherein the composite negative electrode sheet comprises:

[0006] Negative electrode body;

[0007] Lithium foil, used to replenish lithium for the negative electrode body;

[0008] The bonding layer is arranged between the negative electrode sheet body and the lithium foil, and is used for bonding the negative electrode sheet body and the lithium foil.

[0009] In one embodiment, the adhesive layer is a porous structure.

[0010] In one embodiment, the adhesive layer is a self-supporting adhesive film.

[0011] In one embodiment, the bonding layer includes a plurality of bonding areas, each of which has a gap therebetween, and the gap is used to form an electrolyte transmission channel.

[0012] In one embodiment, the pole piece further comprises:

[0013] The coating layer is a porous structure and is arranged on the surface of the lithium foil away from the pole piece to isolate the composite roller from the lithium foil.

[0014] In one embodiment, the bonding layer and / or the coating layer is a solid electrolyte membrane.

[0015] In one embodiment, the width of the adhesive layer and the coating layer is greater than or equal to the width of the lithium foil.

[0016] In a second aspect, a battery cell is provided, the battery cell comprising:

[0017] A positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet;

[0018] Wherein, the negative electrode sheet is the composite negative electrode sheet described in the first aspect or any possible implementation manner of the first aspect;

[0019] The positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence and rolled up from one end to form a roll-like body. Both the positive electrode sheet and the negative electrode sheet are provided with pole ears, which extend from the end of the roll-like body.

[0020] In a third aspect, a battery is provided, comprising a battery cell as described in the second aspect or any possible embodiment of the second aspect, and a shell, a top cover and an electrolyte, wherein one end of the shell is open, the battery cell and the electrolyte are both arranged in the shell, the top cover is arranged on the open end of the shell, and the top cover is provided with a pole connected to the pole ear on the battery cell.

[0021] In a fourth aspect, an electrical device is provided, comprising a battery as described in any possible implementation of the third aspect or the second aspect, wherein the battery is used to provide electrical energy to the electrical device.

[0022] The above-mentioned composite negative electrode sheet, battery cell, battery and electrical device can compensate for the capacity loss of the negative electrode sheet caused by the growth of the solid electrolyte phase interface through the lithium foil attached to the negative electrode sheet body, and can improve the first-week coulomb efficiency and cycle life of the battery; the adhesive layer arranged between the negative electrode sheet body and the lithium foil can increase the bonding degree between the negative electrode sheet and the lithium foil, so that the negative electrode sheet body and the lithium foil are more tightly combined, and reduce the occurrence of uneven lithium foil on the surface of the negative electrode sheet due to the delamination of the negative electrode sheet and the lithium foil, which is helpful to improve the lithium replenishment effect of the battery cell and can improve the yield rate of the negative electrode sheet. Avoid the problems caused by uneven lithium replenishment on the production quality of the electrode sheet and the battery cell, thereby avoiding the waste of raw materials, reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] FIG1 is a schematic diagram of the structure of a composite negative electrode sheet provided in one embodiment of the present application;

[0025] FIG. 2 is a top view of the bonding area of ​​a composite negative electrode sheet provided in one embodiment of the present application.

[0026] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the attached symbols are explained as follows:

[0027] 100: composite negative electrode sheet, 110: negative electrode sheet body, 120: bonding layer, 121: bonding area, 122: gap, 130: lithium foil, 140: coating layer. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] Battery lithium replenishment is to add lithium to the inside of the lithium-ion battery to replenish lithium ions before the battery works. The electrode material is replenished with lithium through pre-lithiation to offset the irreversible lithium loss, so as to increase the total capacity and energy density of the battery. Usually, lithium foil is compounded on the negative electrode sheet during the preparation process of the negative electrode sheet to achieve negative electrode lithium replenishment. However, lithium replenishment does not mean that the more lithium foil, the better. If the amount of lithium replenishment is too much, lithium dendrites will be generated on the surface of the negative electrode sheet during charging. The lithium dendrites can easily puncture the diaphragm between the positive and negative electrode sheets and cause a short circuit between the positive and negative electrode sheets, which will cause certain safety hazards to the battery. Therefore, when replenishing lithium, the amount of lithium replenishment must be strictly controlled. The existing technology usually uses ultra-thin lithium foil.

[0035] However, affected by factors such as processing technology and equipment, the bonding effect between this ultra-thin lithium foil and the negative electrode sheet is poor, which can easily lead to uneven lithium foil composited on the surface of the negative electrode sheet, resulting in defects on the surface of the electrode sheet, affecting the lithium replenishment effect, while also affecting the production quality of the electrode sheet and battery cells, thereby causing a huge waste of raw materials.

[0036] In order to solve the above problems, the present application provides a composite negative electrode sheet. Referring to FIG. 1 , FIG. 1 shows a schematic diagram of the structure of a composite negative electrode sheet 100 in an embodiment of the present invention. The composite negative electrode sheet 100 provided in an embodiment of the present invention includes:

[0037] Negative electrode sheet body 110;

[0038] The lithium foil 130 is attached to the negative electrode sheet body 110 and is used to supplement lithium for the negative electrode sheet body 110;

[0039] The bonding layer 120 is disposed between the negative electrode sheet body 110 and the lithium foil 130 , and is used to bond the negative electrode sheet body 110 and the lithium foil 130 .

[0040] Among them, the negative electrode sheet body 110 is also called the negative electrode or negative electrode material, which is the component responsible for embedding and releasing lithium ions in the battery. The negative electrode sheet mainly includes two components: conductive material and lithium embedded material. The conductive material may include carbon and conductive polymer, etc., which are used to conduct current so that the battery can realize the charging and discharging process. The lithium embedded material may include graphite, silicon and lithium alloy, etc., which are used to embed or release lithium ions during the charging and discharging process. The lithium foil 130 is a sheet structure made of high-purity lithium metal. During the charging process of the battery, the lithium foil 130 can release lithium ions, and the lithium ions are embedded in the active material of the negative electrode to achieve lithium replenishment of the negative electrode.

[0041] The adhesive layer 120 may be a layered structure made of a material with adhesive properties, used to increase the degree of adhesion between the negative electrode sheet and the lithium foil 130, to avoid the negative electrode sheet and the lithium foil 130 being delaminated, resulting in uneven lithium foil 130 on the surface of the negative electrode sheet, so as to ensure the lithium replenishment effect of the battery cell. It may be a single-layer structure or a multi-layer structure. The adhesive layer 120 may be a coating prepared by a process such as spraying, a coating applied using a tool such as a roller, or a coating obtained by immersing the lithium foil 130 in a solution of the adhesive layer 120 material and drying the lithium foil 130 adsorbed with the solution. It may also be an adhesive film with a certain degree of self-support.

[0042] The material of the bonding layer 120 may include a substrate, a conductive agent, an adhesive, a filler or a curing agent, etc. The substrate may be made of a material with good chemical stability and mechanical strength, such as polypropylene and polyethylene, the conductive agent may be carbon black or a conductive polymer, the adhesive is used to enhance the adhesion of the bonding layer 120, the filler is used to increase the mechanical strength of the bonding layer 120, and during the coating preparation process, the curing agent is used to cure the bonding layer 120 under specific conditions, such as an ultraviolet curing agent, etc.

[0043] Furthermore, the adhesive layer 120 is a porous structure, that is, there are multiple pores inside the adhesive layer 120, and the multiple pores can be interconnected. The pores can serve as electrolyte transmission channels, allowing the electrolyte to penetrate between the negative electrode sheets, thereby improving the conduction efficiency of lithium ions between the negative electrode sheets. The adhesive layer 120 can be formed into a porous structure by adding a porous substance or a foaming agent to the adhesive layer 120 material, or by coating the adhesive layer 120 material and then volatilizing the solvent to form a porous structure.

[0044] In other embodiments, the bonding layer 120 can also be a plurality of unconnected bonding areas. FIG. 2 shows a schematic diagram of the structure of the bonding area 121 of the composite negative electrode sheet 100 in one embodiment of the utility model. In combination with FIG. 2 , in one embodiment, the bonding layer 120 includes a plurality of bonding areas 121, and there is a gap 122 between each bonding area 121. Each bonding area 121 can be arranged at intervals as shown in FIG. 2 , and the gap 122 constitutes an electrolyte transmission channel, and at the same time separates each bonding area 121, which can not only ensure the transmission of ions between the electrodes, but also improve the adhesion between the lithium foil 130 and the negative electrode sheet body 110, and can also save raw materials. It can be understood that the area and shape of each bonding area 121 can be set according to actual needs, and the arrangement method can also be different from that shown in FIG. 2, and can be in the form of an array arrangement, etc., which will not be described in detail here.

[0045] Further, in conjunction with FIG1 , the electrode sheet further includes: a coating layer 140, which is disposed on the surface of the lithium foil 130 away from the electrode sheet, and is used to isolate the composite roller from the lithium foil 130. The coating layer 140 is a layer located on the surface of the lithium foil 130 for protecting the lithium foil 130, one surface of the lithium foil 130 is in contact with the negative electrode sheet body 110, and the other surface is provided with the coating layer 140.

[0046] Considering that the lithium foil 130 is usually thin, when the lithium foil 130, the adhesive layer and the negative electrode sheet are rolled together for compounding, the lithium foil 130 is easy to adhere to the roller and is not easy to transfer to the negative electrode sheet, resulting in uneven lithium replenishment on the negative electrode sheet, affecting the lithium replenishment effect. Therefore, a coating layer 140 is provided on the side of the lithium foil 130 away from the adhesive layer. By setting the composite negative electrode sheet 100 into the above structure, during compounding, the coating layer 140, the lithium foil 130, the adhesive layer and the negative electrode sheet body 110 are stacked together in sequence and sent between two compound rollers for compounding. The wrapping layer helps to isolate the lithium foil 130 from the compound roller, prevents the lithium foil 130 from adhering to the compound roller, and thus helps to ensure the lithium replenishment effect.

[0047] Furthermore, the coating layer 140 is a porous structure with ion conductivity and viscosity to ensure the ion conductivity of the composite negative electrode sheet 100, so that ions can be transmitted between the electrodes, while preventing the composite negative electrode sheet 100 from being delaminated and affecting ion transmission.

[0048] Specifically, the bonding layer 120 and / or the coating layer 140 are both solid electrolyte membranes.

[0049] Among them, the bonding layer 120 can be a solid electrolyte membrane. Since the raw material of the solid electrolyte membrane contains a binder, both sides of the solid electrolyte layer are sticky. The solid electrolyte membrane is arranged between the negative electrode sheet and the lithium foil 130, which can enhance the adhesion between the two, thereby helping to avoid the delamination of the lithium foil 130 and the negative electrode sheet. At the same time, the solid electrolyte membrane also contains solid electrolyte particles, so that the solid electrolyte membrane has ion conductivity to ensure the transmission of lithium ions. The coating layer 140 can also be a solid electrolyte membrane. The solid electrolyte membrane is sticky and ion conductive, and it can adhere well to the lithium foil 130. It is not easy to delaminate with the lithium foil 130 when in use, which can enhance the composite effect of the composite negative electrode sheet 100.

[0050] The material of the solid electrolyte membrane can be oxide ceramics, such as lithium titanium oxide phosphate, lithium oxide lithium borate, polymer electrolyte, such as polyethylene oxide and its derivatives, polyacrylonitrile, etc., or a composite material composed of multiple solid electrolyte materials. The preparation of the solid electrolyte membrane is a prior art and will not be described in detail here.

[0051] Furthermore, the width of the adhesive layer and the coating layer 140 is greater than or equal to the width of the lithium foil 130. When the width of the adhesive layer and the coating layer 140 is the same as or greater than the width of the lithium foil 130, during compounding, the edges of the solid electrolyte membrane of the adhesive layer and the solid electrolyte membrane of the coating layer 140 are slightly deformed by pressure, and the edges of the lithium foil 130 in the width direction can be wrapped to prevent the edges of the lithium foil 130 from adhering to the compounding roller, thereby preventing the lithium foil bonded to the compounding roller from affecting the subsequent compounding of the pole piece.

[0052] Furthermore, the width of the lithium foil 130 is equal to the width of the negative electrode sheet body 110, so that the lithium foil 130 can completely cover the negative electrode sheet body 110 in the width direction. Through the above arrangement, the uniformity of the lithium foil 130 on the negative electrode sheet body 110 can be ensured, thereby ensuring uniform lithium replenishment. It can be understood that before compounding, the width of the lithium foil 130 can be larger than the width of the negative electrode sheet body 110, or smaller than the width of the negative electrode sheet body 110. After the compounding is completed, the extra edge of the lithium foil 130 in the width direction or the edge not covered by the lithium foil 130 can be cut off.

[0053] Based on the same inventive concept, the embodiments of the present application also provide a battery cell, a battery, and an electric device including the composite negative electrode sheet 100 mentioned above. The implementation scheme for solving the problem provided by the battery cell is similar to the implementation scheme recorded in the above method, so the specific definitions in the embodiments of one or more battery cells, batteries, and electric devices provided below can refer to the above definitions of the composite negative electrode sheet 100, and will not be repeated here.

[0054] A battery cell provided in an embodiment of the present application comprises: a positive electrode sheet, a negative electrode sheet and a separator disposed between the positive electrode sheet and the negative electrode sheet; wherein the negative electrode sheet is the composite negative electrode sheet 100 described in the above embodiments. wherein the separator is disposed between the positive electrode sheet and the negative electrode sheet to insulate the positive electrode sheet and the negative electrode sheet. the stacked positive electrode sheet, separator and negative electrode sheet are wound into a columnar shape from one end to form a wound battery cell. a positive electrode ear is disposed on the positive electrode sheet, and the positive electrode ear extends from one end of the battery cell; a negative electrode ear is disposed on the negative electrode sheet, and the negative electrode ear also extends from one end of the battery cell; the positive electrode ear and the negative electrode ear are both used to realize the electrical connection between the battery cell and an external device.

[0055] A battery provided in an embodiment of the present application includes a battery cell as described in the above embodiments.

[0056] In some embodiments, the battery includes a battery cell, a shell and a top cover, wherein an opening is provided at one end of the shell, the battery cell is provided in the shell, the shell contains electrolyte, the top cover sealing cover is provided at the shell opening, and a positive electrode column and a negative electrode column are provided on the top cover, the positive electrode column and the negative electrode column are respectively connected to the positive electrode ear and the negative electrode ear on the battery cell, so that the battery cell can supply power to the electrical equipment outside the shell through the positive electrode column and the negative electrode column.

[0057] An electrical device provided in an embodiment of the present application includes a battery as described in the above embodiments, and the battery is used to provide electrical energy to the electrical device. The battery can be used as a power source for the electrical device, and can also be used as an energy storage unit for the electrical device. The electrical device may include mobile devices, electric vehicles, electric trains, ships and satellites, energy storage systems, etc., but are not limited thereto. Among them, the mobile device may be, for example, a mobile phone, a laptop computer, etc.; the electric vehicle may be, for example, a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, etc., but are not limited thereto. The electrical device may select a battery according to its usage requirements.

[0058] In some embodiments, the battery involved in the electrical device may also be multiple batteries. The multiple batteries can be connected in series, in parallel or mixed to form a battery pack according to the needs of the electrical equipment. The battery pack can meet the greater power needs of the electrical device.

[0059] The present application provides an adhesive layer between the negative electrode sheet body 110 and the lithium foil 130 to enhance the bonding effect between the negative electrode sheet body 110 and the lithium foil 130, thereby avoiding stratification between the lithium foil 130 and the negative electrode sheet body 110, ensuring the uniformity of the lithium foil 130 on the surface of the negative electrode sheet body 110, and ensuring the lithium replenishment effect. A coating layer 140 is provided on the side of the lithium foil 130 away from the adhesive layer. During the composite process, the coating layer 140 is located between the lithium foil 130 and the composite roller, which helps to avoid the lithium foil 130 from adhering to the composite roller, thereby helping to ensure the uniformity of the lithium foil 130 on the surface of the electrode sheet, ensuring the lithium replenishment effect, avoiding the problems caused by uneven lithium replenishment on the production quality of the electrode sheet and the battery cell, thereby avoiding the waste of raw materials and reducing costs and increasing efficiency.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A composite negative electrode sheet, characterized in that: The composite negative electrode sheet comprises: Negative electrode body; Lithium foil, used to supplement lithium for the negative electrode sheet; The bonding layer is arranged between the negative electrode sheet body and the lithium foil, and is used for bonding the negative electrode sheet body and the lithium foil.

2. The composite negative electrode sheet according to claim 1, characterized in that: The bonding layer is a porous structure.

3. The composite negative electrode sheet according to claim 2, characterized in that: The adhesive layer is a self-supporting adhesive film.

4. The composite negative electrode sheet according to claim 2, characterized in that: The adhesive layer includes a plurality of adhesive regions, and gaps are provided between the adhesive regions.

5. The composite negative electrode sheet according to any one of claims 1 to 4, characterized in that: The pole piece also includes: The coating layer is a porous structure, which is arranged on the surface of the lithium foil away from the pole piece and is used to isolate the composite roller from the lithium foil.

6. The composite negative electrode sheet according to claim 5, characterized in that: The bonding layer and / or the coating layer is a solid electrolyte membrane.

7. The composite negative electrode sheet according to claim 5, characterized in that: The widths of the adhesive layer and the coating layer are greater than or equal to the width of the lithium foil.

8. A battery cell, characterized in that: The battery cell comprises: A positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet; Wherein, the negative electrode sheet is a composite negative electrode sheet according to any one of claims 1 to 7; The positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence and rolled up from one end to form a roll-like body. Both the positive electrode sheet and the negative electrode sheet are provided with pole ears, and the pole ears extend from the end of the roll-like body.

9. A battery, characterized in that: It includes a battery cell as described in claim 8, as well as a shell, a top cover and an electrolyte, wherein one end of the shell is open, the battery cell and the electrolyte are both arranged in the shell, the top cover is arranged on the open end of the shell, and the top cover is provided with a pole connected to the pole ear on the battery cell.

10. An electrical device, characterized in that: The invention comprises a battery as claimed in claim 9, wherein the battery is used to provide electrical energy to the electrical device.

Images