WO2024086981A1

WO2024086981A1 - Battery cell and manufacturing method therefor, battery, and electrical device

Info

Publication number: WO2024086981A1
Application number: PCT/CN2022/127083
Authority: WO
Inventors: 许虎; 金海族; 曾毓群; 赵丰刚; 郭继鹏; 牛少军
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2024-05-02

Abstract

Provided are a battery cell (20) and a manufacturing method therefor, a battery (100), and an electrical device, relating to the technical field of batteries. The battery cell (20) comprises a housing (21), a conductive column (22), and an end cover (23). An accommodating cavity (211) is formed in the housing (21), and in a first direction (X), an opening (212) is provided at one end of the housing (21), and a first active material layer (24) is provided at the side of the housing (21) facing the accommodation cavity (212). The conductive column (22) is inserted in the accommodating cavity (212) in the first direction (X), a second active material layer (25) is provided on the outer peripheral surface of the conductive column (22), the second active material layer (25) is arranged to face the first active material layer (24), and the polarity of the second active material layer (25) and the polarity of the first active material layer (24) are opposite. The end cover (23) covers the opening (212) and is connected to the conductive column (22). Such a battery cell (20) does not require winding of electrode sheets, so that the process of assembling and connecting a current collecting component and a tab to each other is removed, the production efficiency of the battery cell (20) is improved; and there is no need to provide a number of electrolytes in the housing, and members such as a current collecting component are removed, so that the manufacturing costs are reduced, and the space utilization of the battery cell (20) is improved.

Description

Battery cell and manufacturing method thereof, battery and power-using device

Technical Field

The present application relates to the field of battery technology, and in particular to a battery cell and a manufacturing method thereof, a battery and an electrical device.

Background technique

In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Batteries, as core components of new energy vehicles, also have high requirements in production efficiency and production costs. Among them, batteries are usually composed of multiple battery cells connected in series, parallel or mixed.

Corresponding to the battery cells mentioned in some related technologies, researchers found that existing battery cells are usually assembled into electrode assemblies (bare cells) by winding or laminating positive electrode sheets, negative electrode sheets and separators, which are then loaded into a shell, covered with end covers, and finally injected with electrolyte. The manufacturing process of battery cells with this structure is relatively cumbersome and difficult, resulting in low production efficiency and high production costs of battery cells. Therefore, it is urgent to clarify the reasons why the manufacturing process of battery cells is cumbersome and difficult and to formulate improvement plans to solve the problems of low production efficiency and high manufacturing costs of battery cells.

Summary of the invention

The embodiments of the present application provide a battery cell and a manufacturing method thereof, a battery, and an electrical device, which can effectively improve the production efficiency of the battery cell and reduce the manufacturing cost of the battery cell.

In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a conductive column and an end cover; a accommodating cavity is formed inside the shell, and along a first direction, one end of the shell is provided with an opening connected to the accommodating cavity, and a first active material layer is provided on the side of the shell facing the accommodating cavity; the conductive column extends along the first direction and is inserted into the accommodating cavity, and a second active material layer is provided on the outer peripheral surface of the conductive column, the second active material layer is arranged facing the first active material layer, and the second active material layer has an opposite polarity to the first active material layer; the end cover covers the opening and is connected to the conductive column.

In the above technical solution, a first active material layer and a second active material layer with opposite polarities are respectively arranged on the side of the shell facing the accommodating cavity and on the outer peripheral surface of the conductive column, and the conductive column is inserted into the accommodating cavity of the shell along the first direction, so that the first active material layer and the second active material layer are arranged facing each other, so that the shell and the conductive column can be used as the positive and negative output poles of the battery cell respectively to realize the input or output of the electric energy of the battery cell. On the one hand, the battery cell adopting this structure does not need to wind the pole piece, and saves the process of assembling and connecting the current collecting component and the pole ear, which is conducive to improving the production efficiency of the battery cell. On the other hand, it is not necessary to set a large amount of electrolyte in the shell, and the current collecting component and other components are eliminated, which is conducive to reducing the manufacturing cost of the battery cell, and is conducive to improving the internal space utilization of the battery cell, so as to improve the energy density of the battery cell. In addition, a conductive column is arranged at the center of the battery cell, so as to alleviate the risk of collapse of the center hole of the battery cell during the later use, which is conducive to improving the stability of the battery cell and improving the safety of the battery cell.

In some embodiments, the first active material layer is coated on a surface of the shell facing the accommodating cavity.

In the above technical solution, by coating the first active material layer on the surface of the shell facing the accommodating cavity, that is, the first active material layer is arranged on the cavity wall of the accommodating cavity, the shell can be directly used as the output electrode of the battery cell. This structure does not require the first active material layer to be arranged on the current collector and then the current collector is connected to the shell, which is beneficial to optimize the production process of the battery cell, save the manufacturing cost of the battery cell, and can improve the connection stability and reliability of the first active material layer arranged on the shell.

In some embodiments, the shell is a columnar structure, and a central axis of the shell extends along the first direction.

In the above technical solution, by setting the shell as a columnar structure extending along the first direction, that is, the battery cell is a columnar structure extending along the first direction, the battery cell adopting this structure is relatively simple and easy to assemble, which is beneficial to reduce the difficulty of assembling the battery cell and improve the production efficiency of the battery cell.

In some embodiments, along the first direction, the length of the shell is L, and the maximum dimension of a cross section of the shell perpendicular to the first direction is D ₁ , satisfying L ≥ D ₁ .

In the above technical solution, by setting the length of the shell in the first direction to be greater than or equal to the maximum dimension of the cross section of the shell in the direction perpendicular to the first direction, that is, the shell is a long strip structure extending along the first direction. The battery cell adopting this structure is beneficial to improving the capacity of the first active material layer and the second active material layer, and can effectively increase the area of the region where the first active material layer and the second active material layer are facing each other, which is beneficial to improving the energy density and performance of the battery cell.

In some embodiments, 1.5≤L/D ₁ ; and/or, L/D ₁ ≤25.

In the above technical solution, by setting the ratio of the length of the shell in the first direction to the maximum dimension of the cross section of the shell perpendicular to the first direction to be greater than or equal to 1.5, the area where the outer peripheral surface of the conductive column and the inner surface of the shell face each other can be effectively increased under the same volume of the battery cell, so as to increase the coating amount of the first active material layer and the second active material layer, and the area of the area where the first active material layer and the second active material layer face each other, thereby alleviating the phenomenon that the capacity of the first active material layer and the second active material layer is insufficient due to the ratio being too small, and the area of the area where the first active material layer and the second active material layer face each other is too small. In addition, by setting the ratio of the length of the shell in the first direction to the maximum dimension of the cross section of the shell perpendicular to the first direction to be less than or equal to 25, the structure of the battery cell that is too slender due to the ratio being too large can be alleviated, so as to reduce the difficulty of manufacturing the battery cell.

In some embodiments, both the first active material layer and the second active material layer are annular structures extending along the circumference of the conductive column.

In the above technical solution, by arranging the first active material layer and the second active material layer to be a structure that both extend along the circumference of the conductive column, that is, the first active material layer and the second active material layer are both annular structures surrounding the outside of the conductive column, the battery cell adopting this structure can further increase the capacity of the first active material layer and the second active material layer and the area of the region where the first active material layer and the second active material layer are arranged facing each other, thereby effectively improving the energy density of the battery cell and improving the performance of the battery cell.

In some embodiments, the first active material layer surrounds the conductive column along its circumference to form a mounting channel for inserting the conductive column, and an inner surface of the mounting channel fits with an outer circumferential surface of the second active material layer.

In the above technical scheme, by setting the inner surface of the first active material layer and the outer peripheral surface of the second active material layer to a mutually fitting structure, that is, the second active material layer is inserted into the installation channel formed by the first active material layer, and the shape of the surface of the second active material layer facing the first active material layer is the same as the shape of the surface of the first active material layer facing the second active material layer, it is convenient to assemble the conductive column provided with the second active material layer into the installation channel formed by the first active material layer, which is beneficial to reduce the difficulty of assembling the battery cell, and is beneficial to reduce the space waste between the first active material layer and the second active material layer, so as to improve the energy density of the battery cell.

In some embodiments, a cross-section of the mounting channel perpendicular to the first direction is circular.

In the above technical solution, the cross-section of the installation channel formed by the first active material layer is set to a circle, that is, the installation channel is a circular channel. This structure can effectively alleviate the interference or scratching between the first active material layer and the second active material layer when the second active material layer is assembled into the installation channel. On the one hand, it can be beneficial to improve the assembly efficiency of the battery cell, and on the other hand, it can effectively improve the production quality of the battery cell.

In some embodiments, the first active material layer includes a plurality of first reaction layers, and the plurality of first reaction layers are stacked along a radial direction of the conductive pillar.

In the above technical solution, the first active material layer is stacked by multiple first reaction layers arranged along the radial direction of the conductive column. The first active material layer with such a structure is easy to manufacture on the one hand, which is beneficial to reduce the manufacturing difficulty of setting the first active material layer on the wall surface of the cavity of the shell. On the other hand, it can enhance the wetting effect of the electrolyte of the first active material layer to ensure the penetration of metal ions in the first active material layer.

In some embodiments, along the radial direction of the conductive pillar, the density of the first reaction layer close to the second active material layer among the plurality of first reaction layers is smaller than the density of other first reaction layers.

In the above technical solution, by setting the density of the first reaction layer close to the second active material layer to be smaller than the density of other first reaction layers, the kinetics of the first reaction layer close to the second active material layer is made better, so that the metal ions can diffuse into other first reaction layers, which is beneficial to reduce the internal resistance and improve the performance of the battery cell, and at the same time can alleviate the polarization phenomenon of the battery cell.

In some embodiments, along the radial direction of the conductive pillar, a particle diameter of the first reaction layer close to the second active material layer among the plurality of first reaction layers is smaller than a particle diameter of other first reaction layers.

In the above technical solution, by setting the particle diameter of the first reaction layer close to the second active material layer to be smaller than the particle diameter of other first reaction layers, the kinetics of the first reaction layer close to the second active material layer is made better, so that the metal ions can diffuse into other first reaction layers, which is beneficial to reduce the internal resistance and improve the performance of the battery cell, and at the same time can alleviate the polarization phenomenon of the battery cell.

In some embodiments, the number of the first reaction layers of the first active material layer is N ₁ , satisfying 2≤N ₁ ≤3.

In the above technical solution, by setting the number of the first reaction layers of the first active material layer to 2 to 3, on the one hand, the phenomenon of poor electrolyte infiltration caused by too small a number of first reaction layers can be alleviated to ensure the performance of the battery cell; on the other hand, the difficulty in manufacturing the first active material layer and the risk of falling off caused by too many first reaction layers can be reduced.

In some embodiments, the second active material layer includes a plurality of second reaction layers, and the plurality of second reaction layers are stacked along a radial direction of the conductive pillar.

In the above technical solution, the second active material layer is stacked by multiple second reaction layers arranged radially along the conductive column. The second active material layer with such a structure is easy to manufacture, which is beneficial to reduce the manufacturing difficulty of setting the second active material layer on the wall surface of the accommodating cavity of the shell. On the other hand, it can enhance the wetting effect of the electrolyte of the second active material layer to ensure the penetrability of metal ions in the second active material layer.

In some embodiments, along the radial direction of the conductive pillar, the density of the second reaction layer close to the first active material layer among the plurality of second reaction layers is smaller than the density of other second reaction layers.

In the above technical solution, by setting the density of the second reaction layer close to the first active material layer to be smaller than the density of other second reaction layers, the dynamics of the second reaction layer close to the first active material layer is made better, so that the metal ions can diffuse into other second reaction layers, which is beneficial to reduce the internal resistance and improve the performance of the battery cell, and at the same time can alleviate the polarization phenomenon of the battery cell.

In some embodiments, along the radial direction of the conductive pillar, a particle diameter of the second reaction layer close to the first active material layer among the plurality of second reaction layers is smaller than a particle diameter of other second reaction layers.

In the above technical solution, by setting the particle diameter of the second reaction layer close to the first active material layer to be smaller than the particle diameter of other second reaction layers, the kinetics of the second reaction layer close to the first active material layer is made better, so that the metal ions can diffuse into other second reaction layers, which is beneficial to reduce the internal resistance and improve the performance of the battery cell, and at the same time can alleviate the polarization phenomenon of the battery cell.

In some embodiments, the number of the second reaction layers of the second active material layer is N ₂ , satisfying 2≤N ₂ ≤3.

In the above technical solution, by setting the number of the second reaction layers of the second active material layer to 2 to 3, on the one hand, the phenomenon of poor electrolyte infiltration caused by too small a number of second reaction layers can be alleviated to ensure the performance of the battery cell; on the other hand, the difficulty in manufacturing the second active material layer and the risk of falling off caused by too many second reaction layers can be reduced.

In some embodiments, a first notch groove is provided on the surface of the first active material layer facing the second active material layer, and the first notch groove is used to accommodate an electrolyte; and/or a second notch groove is provided on the surface of the second active material layer facing the first active material layer, and the second notch groove is used to accommodate an electrolyte.

In the above technical solution, by providing a first notch groove for accommodating the electrolyte on the surface of the first active material layer facing the second active material layer, the battery cell of this structure can effectively improve the first active material layer's ability to retain the electrolyte, and can improve the electrolyte's wetting effect on the first active material layer, thereby helping to improve the battery cell's performance. Similarly, by providing a second notch groove for accommodating the electrolyte on the surface of the second active material layer facing the first active material layer, the battery cell of this structure can effectively improve the second active material layer's ability to retain the electrolyte, and can improve the electrolyte's wetting effect on the second active material layer, thereby helping to improve the battery cell's performance.

In some embodiments, the first active material layer is an annular structure extending along the circumference of the conductive column, and the first notch groove extends along the circumference of the conductive column.

In the above technical solution, the first notch groove is arranged as an annular structure extending along the circumference of the conductive column, that is, the first notch groove is arranged around the entire circumference of the first active material layer, which is beneficial to increase the capacity of the first notch groove for the electrolyte, and further can effectively improve the liquid retention capacity of the first active material layer to ensure the wetting effect of the electrolyte of the first active material layer.

In some embodiments, there are a plurality of first notch grooves, and the plurality of first notch grooves are spaced apart along the first direction.

In the above technical solution, by providing a plurality of first notch grooves on the surface of the first active material layer, and the plurality of first notch grooves are spaced apart along the first direction, it is beneficial to further enhance the liquid retention capacity of the first active material layer and the wetting effect of the electrolyte, so as to enhance the performance of the battery cell.

In some embodiments, the second active material layer is an annular structure extending along the circumference of the conductive column, and the second notch groove extends along the circumference of the conductive column.

In the above technical solution, the second notch groove is arranged as an annular structure extending along the circumference of the conductive column, that is, the second notch groove is arranged around the entire circumference of the second active material layer, which is beneficial to increase the capacity of the second notch groove for the electrolyte, and further can effectively improve the liquid retention capacity of the first active material layer to ensure the wetting effect of the electrolyte of the first active material layer.

In some embodiments, there are a plurality of second scoring grooves, and the plurality of second scoring grooves are spaced apart along the first direction.

In the above technical solution, by providing a plurality of second notched grooves on the surface of the second active material layer, and the plurality of second notched grooves are spaced apart along the first direction, it is beneficial to further enhance the liquid retention capacity of the second active material layer and the wetting effect of the electrolyte, so as to enhance the performance of the battery cell.

In some embodiments, the end cover includes a cover body and a pole; the cover body covers the opening; the pole is insulated and installed on the cover body; wherein the conductive pole is connected to the pole.

In the above technical solution, by connecting the conductive column with the insulated pole installed on the cover body, the input or output of the electric energy of the battery cell can be realized through the pole, thereby alleviating the short circuit phenomenon between the conductive column and the shell through the cover body, which is beneficial to reduce the safety hazards of the battery cell during use.

In some embodiments, the conductive column and the polar column are an integrally formed structure.

In the above technical solution, by setting the conductive column and the pole as an integrally formed structure, that is, the conductive column and the pole are an integrated structure, the battery cell adopting this structure is beneficial to improving the connection stability and reliability between the conductive column and the pole to ensure the conduction area on the one hand, and it is convenient to assemble the conductive column and the end cover as a whole with the shell on the other hand, which is beneficial to reduce the difficulty of assembling the battery cell and improve the assembly efficiency of the battery cell.

In some embodiments, the first active material layer is a negative electrode active material layer, and the second active material layer is a positive electrode active material layer.

In the above technical solution, the first active material layer arranged on the side of the shell facing the accommodating cavity is the negative electrode active material layer, and correspondingly, the second active material layer arranged on the outer peripheral surface of the conductive column is the positive electrode active material layer, so that the negative electrode active material layer can be coated on the outside of the positive electrode active material layer. The battery cell adopting this structure can effectively reduce the risk of lithium plating to improve the safety of the battery cell.

In some embodiments, the battery cell further includes a separator; the separator is disposed between the first active material layer and the second active material layer to separate the first active material layer from the second active material layer.

In the above technical solution, the battery cell is also provided with an isolation membrane located between the first active material layer and the second active material layer, so as to effectively realize the insulation isolation between the first active material layer and the second active material layer, so as to reduce the short circuit phenomenon between the first active material layer and the second active material layer, thereby helping to reduce the safety hazards of the electrode assembly during use.

In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy; or comprising the above-mentioned battery, wherein the battery is used to provide electrical energy.

In a fourth aspect, an embodiment of the present application also provides a method for manufacturing a battery cell, comprising: providing a shell, a conductive column and an end cover, the shell having a accommodating cavity formed therein, one end of the shell having an opening connected to the accommodating cavity along a first direction, and the conductive column extending along the first direction; a first active material layer is provided on a side of the shell facing the accommodating cavity; the conductive column is connected to the end cover; a second active material layer is provided on an outer peripheral surface of the conductive column, the second active material layer having an opposite polarity to the first active material layer; the conductive column is inserted into the accommodating cavity of the shell along the first direction so that the first active material layer and the second active material layer are arranged facing each other, and the end cover is covered with the opening.

In the above technical scheme, a first active material layer is first arranged on a side of the shell facing the accommodating cavity, and a second active material layer is arranged on the outer peripheral surface of the conductive column after the conductive column is connected to the end cover. Then, the conductive column provided with the second active material layer is inserted into the accommodating cavity of the shell along the first direction to realize the facing arrangement of the first active material layer and the second active material layer, and at the same time, the end cover and the opening are covered with each other, thereby completing the assembly and manufacturing of the battery cell. The battery cell manufactured by this manufacturing method does not need to wind the pole piece, and saves the process of assembling and connecting the current collecting component and the pole ear, thereby greatly optimizing the production process and production rhythm of the battery cell, which is beneficial to improving the production efficiency of the battery cell.

In some embodiments, the method for manufacturing the battery cell also includes: providing an isolation membrane; before inserting the conductive column into the accommodating cavity of the shell along the first direction so that the first active material layer and the second active material layer are arranged face to face, and the end cover is covered on the opening, the method for manufacturing the battery cell also includes: wrapping the isolation membrane on the outside of the second active material layer.

In the above technical solution, before the conductive column provided with the second active material layer is inserted into the accommodating cavity of the shell, the isolation membrane is first coated on the outside of the second active material layer, so that when the conductive column is inserted into the accommodating cavity of the shell, the isolation membrane can be assembled into the shell at the same time, and the isolation membrane is arranged between the first active material layer and the second active material layer. This manufacturing method can improve the assembly efficiency of the isolation membrane on the one hand, and reduce the difficulty of assembling the isolation membrane on the other hand.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

FIG2 is an exploded view of a battery structure provided by some embodiments of the present application;

FIG3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

FIG5 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

FIG6 is an exploded view of the structure of a battery cell provided in some other embodiments of the present application;

FIG7 is an exploded view of the structure of a battery cell provided in some other embodiments of the present application;

FIG8 is a cross-sectional view of a battery cell provided in some other embodiments of the present application;

FIG9 is a partial enlarged view of the battery cell A shown in FIG8;

FIG10 is an exploded view of the structure of a battery cell provided in yet other embodiments of the present application;

FIG11 is a cross-sectional view of a first active material layer of a battery cell provided in yet other embodiments of the present application;

FIG12 is a schematic flow chart of a method for manufacturing a battery cell provided in some embodiments of the present application;

FIG. 13 is a schematic flow chart of a method for manufacturing a battery cell provided in some other embodiments of the present application.

Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-shell; 211-accommodating chamber; 212-opening; 22-conductive column; 23-end cover; 231-cover body; 232-pole; 24-first active material layer; 241-installation channel; 242-first reaction layer; 243-first notch groove; 25-second active material layer; 251-second reaction layer; 252-second notch groove; 26-isolation membrane; 200-controller; 300-motor; X-first direction; Y-radial direction of the conductive column.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.

In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

The term "plurality" used in the present application refers to two or more (including two).

In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. With the continuous development of battery technology, higher requirements have been put forward in terms of battery production efficiency and manufacturing cost. Among them, the battery is composed of multiple battery cells, so the production efficiency and manufacturing cost of the battery cells determine the production efficiency and manufacturing cost of the battery.

The inventors found that for general battery cells, the battery cells are usually assembled into electrode assemblies (bare cells) by winding or laminating positive electrode sheets, negative electrode sheets and separators, which are then loaded into a housing, covered with end caps, and finally injected with electrolyte. In the manufacturing process of battery cells with this structure, the electrode sheets need to be wound or laminated first, and then the pole ears of the electrode assembly need to be welded and assembled with the current collecting components, and finally the current collecting components need to be welded and assembled with the end caps or housings, which results in a more complicated and difficult manufacturing process for the battery cells, and more assembly parts and electrolytes are required, which leads to lower production efficiency and higher manufacturing costs for the battery cells.

Based on the above considerations, in order to solve the problem of low production efficiency and high manufacturing cost of battery cells, the inventors have designed a battery cell after in-depth research. The battery cell includes a shell, a conductive column and an end cover. A accommodating cavity is formed inside the shell. Along the first direction, one end of the shell is provided with an opening connected to the accommodating cavity, and a first active material layer is provided on the side of the shell facing the accommodating cavity. The conductive column extends along the first direction and is inserted into the accommodating cavity. A second active material layer is provided on the outer peripheral surface of the conductive column. The second active material layer is arranged facing the first active material layer, and the second active material layer has an opposite polarity to the first active material layer. The end cover covers the opening and is connected to the conductive column.

In a battery cell of this structure, a first active material layer and a second active material layer with opposite polarities are respectively arranged on the side of the shell facing the accommodating cavity and on the outer peripheral surface of the conductive column, and the conductive column is inserted into the accommodating cavity of the shell along the first direction, so that the first active material layer and the second active material layer are arranged facing each other, so that the shell and the conductive column can be used as the positive and negative output poles of the battery cell respectively to realize the input or output of the electric energy of the battery cell. On the one hand, the battery cell adopting this structure does not need to wind the pole piece, and saves the process of assembling and connecting the current collecting component and the pole ear, which is conducive to improving the production efficiency of the battery cell. On the other hand, it is not necessary to set a large amount of electrolyte in the shell, and the current collecting component and other components are eliminated, which is conducive to reducing the manufacturing cost of the battery cell, and is conducive to improving the internal space utilization of the battery cell, so as to improve the energy density of the battery cell. In addition, a conductive column is arranged at the center of the battery cell, so as to alleviate the risk of collapse of the center hole of the battery cell during the later use, which is conducive to improving the stability of the battery cell and improving the safety of the battery cell.

The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is conducive to optimizing the manufacturing process of the battery cells and the accessories required for the battery cells, so as to improve the production efficiency of the battery cells and reduce the manufacturing cost of the battery cells.

The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

Please refer to Figures 2 and 3. Figure 2 is an exploded view of the structure of the battery 100 provided in some embodiments of the present application, and Figure 3 is a schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. For example, in FIG3 , the battery cell 20 is a cylindrical structure.

According to some embodiments of the present application, with reference to FIG. 3, and further with reference to FIG. 4 and FIG. 5, FIG. 4 is an exploded view of the structure of a battery cell 20 provided in some embodiments of the present application, and FIG. 5 is a cross-sectional view of a battery cell 20 provided in some embodiments of the present application. The present application provides a battery cell 20, and the battery cell 20 includes a shell 21, a conductive column 22, and an end cover 23. A receiving cavity 211 is formed inside the shell 21, and an opening 212 communicating with the receiving cavity 211 is provided at one end of the shell 21 along the first direction X, and a first active material layer 24 is provided on the side of the shell 21 facing the receiving cavity 211. The conductive column 22 extends along the first direction X and is inserted into the receiving cavity 211, and a second active material layer 25 is provided on the outer peripheral surface of the conductive column 22, and the second active material layer 25 is arranged facing the first active material layer 24, and the second active material layer 25 is opposite to the first active material layer 24. The end cover 23 covers the opening 212 and is connected to the conductive column 22.

Among them, the first active material layer 24 is arranged on the side of the shell 21 facing the accommodating cavity 211, and the second active material layer 25 is arranged on the conductive column 22, and the conductive column 22 is connected to the end cover 23, so that the shell 21 and the end cover 23 respectively serve as the output pole of the battery cell 20 to realize the input or output of electrical energy.

It should be noted that the first active material layer 24 can be arranged on the side of the shell 21 facing the accommodating cavity 211 in various structures. The first active material layer 24 can be directly coated on the surface of the shell 21 facing the accommodating cavity 211, that is, the first active material layer 24 is coated on the cavity wall surface of the accommodating cavity 211. Of course, the first active material layer 24 can also be indirectly arranged on the surface of the shell 21 facing the accommodating cavity 211. For example, the first active material layer 24 is coated on a current collector made of metal foil, and then the current collector is covered and connected to the surface of the shell 21 facing the accommodating cavity 211.

In some embodiments, the first active material layer 24 may also be not electrically connected to the shell 21, that is, the first active material layer 24 is insulated and installed on the surface of the shell 21 facing the accommodating cavity 211. For example, the first active material layer 24 is coated on a current collector made of metal foil, and the current collector is then covered on the surface of the shell 21 facing the accommodating cavity 211, and an insulating layer is arranged between the current collector and the shell 21. That is to say, the current collector provided with the first active material layer 24 is connected to the surface of the shell 21 facing the accommodating cavity 211 through the insulating layer to achieve insulation isolation between the current collector provided with the first active material layer 24 and the shell 21. In this embodiment, the current collector provided with the first active material layer 24 can be connected to the end cover 23 so that the end cover 23 serves as the output pole of the first active material layer 24, and can also be connected to the electrode terminal insulated and installed on the shell 21, so that the electrode terminal insulated and installed on the shell 21 serves as the output pole of the first active material layer 24.

The first active material layer 24 and the second active material layer 25 are active materials disposed on the shell 21 and the conductive column 22 respectively. The first active material layer 24 and the second active material layer 25 are areas where chemical reactions occur in the battery cell 20, and they mainly work by moving metal ions between the first active material layer 24 and the second active material layer 25.

Optionally, if the first active material layer 24 is a positive electrode active material layer, the material of the first active material layer 24 may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc., and correspondingly, the second active material layer 25 is a negative electrode active material layer, and the material of the second active material layer 25 may be carbon or silicon, etc.; if the first active material layer 24 is a negative electrode active material layer, the material of the first active material layer 24 may be carbon or silicon, etc., and correspondingly, the second active material layer 25 is a positive electrode active material layer, and the material of the second active material layer 25 may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

The conductive pillar 22 extends along the first direction X and is inserted into the accommodating cavity 211 , that is, the conductive pillar 22 is inserted into the accommodating cavity 211 of the housing 21 along the first direction X.

The second active material layer 25 is disposed on the outer peripheral surface of the conductive column 22 , that is, the conductive column 22 is inserted into the accommodating cavity 211 , and the second active material layer 25 is disposed on the surface of the conductive column 22 facing the housing 21 .

The conductive pillar 22 may have a variety of structures. The conductive pillar 22 may be a solid structure, that is, the conductive pillar 22 is a solid columnar structure extending along the first direction X. Of course, the conductive pillar 22 may also be a hollow structure, that is, the conductive pillar 22 is a hollow columnar structure extending along the first direction X, so that the cross section of the conductive pillar 22 perpendicular to the first direction X is annular. For example, in FIG5 , the conductive pillar 22 is a solid columnar structure extending along the first direction X.

It is understandable that the conductive pillar 22 may have various shapes, such as a cylindrical structure, a rectangular cylindrical structure, a hexagonal prism structure, etc. For example, in FIG5 , the conductive pillar 22 is a cylindrical structure extending along the first direction X.

The second active material layer 25 is disposed facing the first active material layer 24, that is, in the radial direction Y of the conductive column, the first active material layer 24 and the second active material layer 25 are disposed opposite to each other, wherein the radial direction Y of the conductive column is perpendicular to the first direction X. It should be noted that the radial direction Y of the conductive column is the direction in which the outer edge of the cross section of the conductive column 22 perpendicular to the first direction X points to the central axis of the conductive column 22 or the direction in which the central axis of the conductive column 22 points to the outer edge of the cross section of the conductive column 22 perpendicular to the first direction X.

In some embodiments, the housing 21 may also be used to contain electrolytes, such as electrolytes. The housing 21 may also be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, and the like.

The housing 21 can be in various structural forms. In some embodiments, the housing 21 is a hollow structure with an opening 212 on one side, and the end cap 23 covers the opening 212 of the housing 21 and forms a sealed connection to form a sealed space for accommodating the conductive column 22 and the electrolyte. The housing 21 can be in various shapes, such as a cylinder, a cuboid, etc. Exemplarily, in FIG4 , the housing 21 is a cylindrical structure.

When assembling the battery cell 20, the conductive column 22 can be first connected to the end cover 23, and then the conductive column 22 coated with the second active material layer 25 can be inserted into the accommodating cavity 211 of the shell 21, and the electrolyte is filled into the shell 21, and finally the end cover 23 and the shell 21 are covered and sealed.

It is understandable that the shell 21 is not limited to the above structure, and the shell 21 can also be other structures. For example, the shell 21 is a hollow structure with openings 212 at two opposite ends in the first direction X. The battery cell 20 includes two end covers 23, and one end cover 23 corresponds to covering an opening 212 of the shell 21 to form a sealed connection.

In some embodiments, the battery cell 20 may further include a pressure relief mechanism, which may be mounted on the end cap 23 or the housing 21. The pressure relief mechanism is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

Exemplarily, the pressure relief mechanism may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve.

By respectively arranging a first active material layer 24 and a second active material layer 25 with opposite polarities on the side of the shell 21 facing the accommodating cavity 211 and on the outer peripheral surface of the conductive column 22, and inserting the conductive column 22 into the accommodating cavity 211 of the shell 21 along the first direction X, so that the first active material layer 24 and the second active material layer 25 are arranged facing each other, the shell 21 and the conductive column 22 can be used as the positive and negative output electrodes of the battery cell 20 to realize the input or output of electric energy of the battery cell 20. The battery cell 20 adopting such a structure does not need to wind the pole piece, and saves the process of assembling and connecting the current collecting component and the pole ear, which is beneficial to improving the production efficiency of the battery cell 20. On the other hand, there is no need to arrange a large amount of electrolyte in the shell 21, and the current collecting component and other components are eliminated, which is beneficial to reducing the manufacturing cost of the battery cell 20 and improving the internal space utilization of the battery cell 20 to improve the energy density of the battery cell 20. In addition, a conductive column 22 is provided at the center of the battery cell 20 , thereby alleviating the risk of the center hole of the battery cell 20 collapsing during later use, thereby facilitating improving the use stability of the battery cell 20 and improving the use safety of the battery cell 20 .

According to some embodiments of the present application, referring to FIG. 4 and FIG. 5 , the first active material layer 24 is coated on the surface of the shell 21 facing the accommodating cavity 211 .

The first active material layer 24 is coated on the surface of the housing 21 facing the accommodating cavity 211 , that is, the first active material layer 24 is directly disposed on the cavity wall surface of the accommodating cavity 211 .

By coating the first active material layer 24 on the surface of the shell 21 facing the accommodating cavity 211, that is, the first active material layer 24 is arranged on the cavity wall of the accommodating cavity 211, the shell 21 can be directly used as the output pole of the battery cell 20. This structure does not require the first active material layer 24 to be arranged on the current collector and then the current collector is connected to the shell 21, which is beneficial to optimize the production process of the battery cell 20, save the manufacturing cost of the battery cell 20, and can improve the connection stability and reliability of the first active material layer 24 arranged on the shell 21.

According to some embodiments of the present application, please continue to refer to Figures 4 and 5, the shell 21 is a columnar structure, and the central axis of the shell 21 extends along the first direction X.

Among them, the central axis of the shell 21 extends along the first direction X, that is, the shell 21 is a columnar structure extending along the first direction X. The shape of the shell 21 can be various. For example, in Figure 4, the shell 21 is a cylindrical structure extending along the first direction X. In some embodiments, refer to Figure 6, which is a structural explosion diagram of the battery cell 20 provided in some embodiments of the present application. The shell 21 can also be a hexagonal prism structure extending along the first direction X. Of course, in other embodiments, the shell 21 can also be a triangular prism structure, a rectangular columnar structure or a pentagonal columnar structure, etc.

By configuring the shell 21 as a columnar structure extending along the first direction X, that is, the battery cell 20 is a columnar structure extending along the first direction X, the battery cell 20 with this structure has a simpler structure and is easy to assemble, thereby helping to reduce the difficulty of assembling the battery cell 20 and improve the production efficiency of the battery cell 20.

According to some embodiments of the present application, as shown in FIG. 5 , along the first direction X, the length of the shell 21 is L, and the maximum dimension of the cross section of the shell 21 perpendicular to the first direction X is D ₁ , satisfying L ≥ D ₁ .

The maximum dimension of the cross section of the shell 21 perpendicular to the first direction X in the direction perpendicular to the first direction X is D ₁ , that is, the maximum distance between any two points on the outer edge of the cross section of the shell 21 perpendicular to the first direction X is D ₁ , that is, if the shell 21 is a cylindrical structure, D ₁ is the diameter of the cross section of the shell 21 perpendicular to the first direction X; if the shell 21 is a triangular prism structure, D ₁ is the longest side of the cross section of the shell 21 perpendicular to the first direction X; if the shell 21 is a rectangular columnar structure, D ₁ is the diagonal of the cross section of the shell 21 perpendicular to the first direction X.

By setting the length of the shell 21 in the first direction X to be greater than or equal to the maximum dimension of the cross section of the shell 21 in the direction perpendicular to the first direction X, that is, the shell 21 is a long strip structure extending along the first direction X. The battery cell 20 adopting such a structure is beneficial to improving the capacity of the first active material layer 24 and the second active material layer 25, and can effectively increase the area of the region where the first active material layer 24 and the second active material layer 25 are arranged facing each other, thereby helping to improve the energy density and performance of the battery cell 20.

In some embodiments, 1.5≤L/D ₁ , and/or, L/D ₁ ≤25.

Wherein, 1.5≤L/D ₁ , that is, the length of the shell 21 in the first direction X is more than 1.5 times the maximum dimension of the cross section of the shell 21 perpendicular to the first direction X. L/D ₁ ≤25, that is, the length of the shell 21 in the first direction X is less than 25 times the maximum dimension of the cross section of the shell 21 perpendicular to the first direction X.

Exemplarily, the shell 21 is a cylindrical structure, and the maximum dimension of the cross section of the shell 21 perpendicular to the first direction X is the diameter of the shell 21 .

It should be noted that when the length of the shell 21 in the first direction X is set to be more than 1.5 times the diameter of the shell 21, the battery cell 20 is a structure in which the length in the first direction X is greater than the size of the cross section of the battery cell 20, that is, the battery cell 20 is an elongated strip-shaped structure extending along the first direction X. When the battery cell 20 is an elongated strip-shaped structure extending along the first direction X, it is known from manufacturing experience that the length of the outer peripheral surface of the conductive column 22 in the first direction X can be increased, and the length of the cavity wall surface of the accommodating cavity 211 of the shell 21 in the first direction X can be increased, thereby effectively increasing the coating amount of the first active material layer 24 and the second active material layer 25, and increasing the area of the region where the first active material layer 24 and the second active material layer 25 are arranged facing each other.

Preferably, 3≤L/D ₁ . That is, the length of the shell 21 in the first direction X is more than 3 times the diameter of the shell 21 , so that the battery cell 20 is an elongated structure extending along the first direction X, thereby effectively ensuring the capacity of the first active material layer 24 and the second active material layer 25 , and the area of the region where the first active material layer 24 and the second active material layer 25 are disposed facing each other.

Exemplarily, the diameter of the shell 21 and the corresponding length of the shell 21 in the first direction X can be: 18 mm and 65 mm, 18 mm and 200 mm, 18 mm and 300 mm, 21 mm and 70 mm, 21 mm and 200 mm, 21 mm and 310 mm, etc.

By setting the ratio of the length of the shell 21 in the first direction X to the maximum dimension of the cross section of the shell 21 perpendicular to the first direction X to be greater than or equal to 1.5, the area where the outer peripheral surface of the conductive column 22 and the inner surface of the shell 21 face each other can be effectively increased when the volume of the battery cell 20 is the same, so as to increase the coating amount of the first active material layer 24 and the second active material layer 25, and the area of the area where the first active material layer 24 and the second active material layer 25 face each other, thereby alleviating the phenomenon that the first active material layer 24 and the second active material layer 25 are insufficient in the amount of the first active material layer 24 and the second active material layer 25 and the area where the first active material layer 24 and the second active material layer 25 face each other due to the ratio being too small. In addition, by setting the ratio of the length of the shell 21 in the first direction X to the maximum dimension of the cross section of the shell 21 perpendicular to the first direction X to be less than or equal to 25, the battery cell 20 can be relieved from being too slender due to the ratio being too large, so as to reduce the difficulty of manufacturing the battery cell 20.

It should be noted that, in the embodiment in which the first active material layer 24 is arranged on the side of the shell 21 facing the accommodating cavity 211 and the second active material layer 25 is arranged on the outer peripheral surface of the conductive column 22, by setting 1.5≤L/D ₁ and/or L/D ₁ ≤25, of course, in some embodiments, for example, in the shell 21 of the battery cell 20, an electrode assembly formed by winding the positive electrode sheet and the negative electrode sheet around the axis extending in the first direction X to form a battery cell 20 with a cylindrical structure is accommodated, the battery cell 20 can also be set to a structure of 1.5≤L/D ₁ and/or L/D ₁ ≤25.

According to some embodiments of the present application, as shown in FIG. 4 and FIG. 5 , the first active material layer 24 and the second active material layer 25 are both annular structures extending along the circumference of the conductive pillar 22 .

The first active material layer 24 and the second active material layer 25 are both annular structures extending along the circumferential direction of the conductive column 22, that is, the first active material layer 24 and the second active material layer 25 are both annular structures surrounding the outside of the conductive column 22, that is, the second active material layer 25 surrounds the outer peripheral side of the conductive column 22, and the first active material layer 24 surrounds the outer peripheral side of the second active material layer 25. It should be noted that the circumferential direction of the conductive column 22 refers to the direction of surrounding the central axis of the conductive column 22.

In some embodiments, along the radial direction Y of the conductive pillar, the thickness of the first active material layer 24 is D ₂ , satisfying 0.1 mm≤D ₂ ≤15 mm.

For example, the thickness of the first active material layer 24 in the radial direction Y of the conductive pillar may be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, 8 mm, 10 mm, or 15 mm.

In some embodiments, along the radial direction Y of the conductive pillar, the thickness of the second active material layer 25 is D ₃ , satisfying 0.1 mm≤D ₃ ≤15 mm.

For example, the thickness of the second active material layer 25 in the radial direction Y of the conductive pillar may be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, 8 mm, 10 mm, or 15 mm.

By configuring the first active material layer 24 and the second active material layer 25 to extend in the circumferential direction of the conductive column 22, the battery cell 20 using this structure can further increase the capacity of the first active material layer 24 and the second active material layer 25 and the area of the region where the first active material layer 24 and the second active material layer 25 are facing each other, thereby effectively improving the energy density of the battery cell 20 and improving the performance of the battery cell 20.

According to some embodiments of the present application, as shown in Figures 4, 5 and 6, the first active material layer 24 surrounds the conductive column 22 along the circumference to form a mounting channel 241 for inserting the conductive column 22, and the inner surface of the mounting channel 241 fits with the outer peripheral surface of the second active material layer 25.

The first active material layer 24 surrounds the conductive pillar 22 along its circumference to form a mounting channel 241 for the conductive pillar 22 to be inserted into. That is, the first active material layer 24 surrounds the outer circumference of the second active material layer 25 .

The inner surface of the mounting channel 241 and the outer peripheral surface of the second active material layer 25 fit each other, that is, the second active material layer 25 is inserted in the mounting channel 241 formed by the first active material layer 24, and the shape of the surface of the second active material layer 25 facing the first active material layer 24 is the same as the shape of the surface of the first active material layer 24 facing the second active material layer 25. In other words, if the cross-section of the mounting channel 241 formed by the first active material layer 24 perpendicular to the first direction X is circular, then the cross-section of the outer peripheral surface of the second active material layer 25 perpendicular to the first direction X is also circular; if the cross-section of the mounting channel 241 formed by the first active material layer 24 perpendicular to the first direction X is polygonal, then the cross-section of the outer peripheral surface of the second active material layer 25 perpendicular to the first direction X is also polygonal.

By setting the inner surface of the first active material layer 24 and the outer peripheral surface of the second active material layer 25 to be a mutually fitting structure, it is convenient to assemble the conductive column 22 provided with the second active material layer 25 into the installation channel 241 formed by the first active material layer 24, which is beneficial to reduce the difficulty of assembling the battery cell 20 and reduce the space waste between the first active material layer 24 and the second active material layer 25, so as to improve the energy density of the battery cell 20.

In some embodiments, referring to FIG. 4 and FIG. 6 , a cross section of the mounting channel 241 perpendicular to the first direction X is circular.

The cross section of the installation channel 241 perpendicular to the first direction X is circular, and the installation channel 241 is a circular channel.

It can be understood that the shape of the cross-section of the installation channel 241 perpendicular to the first direction X is not limited to this. Referring to Figure 7, Figure 7 is a structural explosion diagram of the battery cell 20 provided in some other embodiments of the present application. The cross-section of the installation channel 241 perpendicular to the first direction X is a hexagon. Of course, in other embodiments, the cross-section of the installation channel 241 perpendicular to the first direction X can also be a rectangle, a pentagon, etc.

It should be noted that the cross-sectional shape of the shell 21 perpendicular to the first direction X may be the same as or different from the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X. For example, in FIG4 , the cross-sectional shape of the shell 21 perpendicular to the first direction X is the same as the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X, and the cross-sectional shape of the shell 21 perpendicular to the first direction X and the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X are both circular. Similarly, in FIG7 , the cross-sectional shape of the shell 21 perpendicular to the first direction X and the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X are both hexagonal. In FIG6 , the cross-sectional shape of the shell 21 perpendicular to the first direction X is different from the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X, and the cross-sectional shape of the shell 21 perpendicular to the first direction X is a hexagon, and the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X is both circular. Of course, the cross-sectional shape of the shell 21 perpendicular to the first direction X may also be circular, and the cross-sectional shape of the mounting channel 241 perpendicular to the first direction X may be hexagonal.

By setting the cross-section of the installation channel 241 formed by the first active material layer 24 to be circular, this structure can effectively alleviate the interference or scratching between the first active material layer 24 and the second active material layer 25 when the second active material layer 25 is assembled into the installation channel 241. On the one hand, it can be beneficial to improve the assembly efficiency of the battery cell 20, and on the other hand, it can effectively improve the production quality of the battery cell 20.

According to some embodiments of the present application, referring to Figures 8 and 9, Figure 8 is a cross-sectional view of a battery cell 20 provided in other embodiments of the present application, and Figure 9 is a partial enlarged view of the battery cell 20 at A shown in Figure 8. The first active material layer 24 includes a plurality of first reaction layers 242, and the plurality of first reaction layers 242 are stacked along the radial direction Y of the conductive pillar.

The plurality of first reaction layers 242 are stacked along the radial direction Y of the conductive pillar, that is, the plurality of first reaction layers 242 are stacked along the radial direction Y of the conductive pillar between the shell 21 and the second active material layer 25 .

The first active material layer 24 is formed by stacking multiple first reaction layers 242 arranged along the radial direction Y of the conductive column. The first active material layer 24 with such a structure is easy to manufacture, which is beneficial to reduce the manufacturing difficulty of setting the first active material layer 24 on the cavity wall surface of the accommodating cavity 211 of the shell 21. On the other hand, it can enhance the wetting effect of the electrolyte of the first active material layer 24 to ensure the penetrability of metal ions in the first active material layer 24.

In some embodiments, as shown in FIGS. 8 and 9 , along the radial direction Y of the conductive pillar, the density of the first reaction layer 242 close to the second active material layer 25 among the plurality of first reaction layers 242 is less than the density of the other first reaction layers 242 .

The density of the first reaction layer 242 close to the second active material layer 25 among the multiple first reaction layers 242 is smaller than that of other first reaction layers 242 , that is, the density of the first reaction layer 242 closest to the second active material layer 25 among the multiple first reaction layers 242 is the smallest.

By setting the density of the first reaction layer 242 close to the second active material layer 25 to be smaller than the density of other first reaction layers 242, the dynamics of the first reaction layer 242 close to the second active material layer 25 is made better, so that the metal ions can diffuse into other first reaction layers 242, which is beneficial to reduce the internal resistance and improve the performance of the battery cell 20, while also alleviating the polarization phenomenon of the battery cell 20.

In some embodiments, referring to FIGS. 8 and 9 , along the radial direction Y of the conductive pillar, the particle diameter of the first reaction layer 242 close to the second active material layer 25 among the plurality of first reaction layers 242 is smaller than the particle diameters of other first reaction layers 242 .

Among them, the particle diameter of the first reaction layer 242 close to the second active material layer 25 among the multiple first reaction layers 242 is smaller than the particle diameters of other first reaction layers 242, that is, the material particle size of the first reaction layer 242 closest to the second active material layer 25 among the multiple first reaction layers 242 is the smallest.

By setting the particle diameter of the first reaction layer 242 close to the second active material layer 25 to be smaller than the particle diameter of other first reaction layers 242, the dynamics of the first reaction layer 242 close to the second active material layer 25 is made better, so that the metal ions can diffuse into other first reaction layers 242, which is beneficial to reduce the internal resistance and improve the performance of the battery cell 20, while also alleviating the polarization phenomenon of the battery cell 20.

According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the number of the first reaction layers 242 of the first active material layer 24 is N ₁ , satisfying 2≤N ₁ ≤3.

The number of the first reaction layers 242 of the first active material layer 24 may be 2 or 3. For example, in FIG. 9 , the first active material layer 24 includes two first reaction layers 242 stacked along the radial direction Y of the conductive column.

By setting the number of first reaction layers 242 of the first active material layer 24 to 2 to 3, on the one hand, the phenomenon of poor electrolyte infiltration caused by too small a number of first reaction layers 242 can be alleviated to ensure the performance of the battery cell 20; on the other hand, the manufacturing difficulty of the first active material layer 24 and the risk of falling off caused by too many first reaction layers 242 can be reduced.

According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the second active material layer 25 includes a plurality of second reaction layers 251 , and the plurality of second reaction layers 251 are stacked along a radial direction Y of the conductive pillar.

The plurality of second reaction layers 251 are stacked along the radial direction Y of the conductive pillars, that is, the plurality of second reaction layers 251 are stacked along the radial direction Y of the conductive pillars between the first active material layer 24 and the conductive pillars 22 .

The second active material layer 25 is formed by stacking multiple second reaction layers 251 arranged along the radial direction Y of the conductive column. The second active material layer 25 with such a structure is easy to manufacture, which is beneficial to reduce the manufacturing difficulty of setting the second active material layer 25 on the cavity wall surface of the accommodating cavity 211 of the shell 21. On the other hand, it can enhance the wetting effect of the electrolyte of the second active material layer 25 to ensure the penetrability of metal ions in the second active material layer 25.

In some embodiments, as shown in FIGS. 8 and 9 , along the radial direction Y of the conductive pillar, the density of the second reaction layer 251 close to the first active material layer 24 among the plurality of second reaction layers 251 is less than the density of the other second reaction layers 251 .

The density of the second reaction layer 251 close to the first active material layer 24 among the multiple second reaction layers 251 is lower than the density of other second reaction layers 251 , that is, the density of the second reaction layer 251 closest to the first active material layer 24 among the multiple second reaction layers 251 is the smallest.

By setting the density of the second reaction layer 251 close to the first active material layer 24 to be smaller than the density of other second reaction layers 251, the dynamics of the second reaction layer 251 close to the first active material layer 24 is made better, so that the metal ions can diffuse into other second reaction layers 251, which is beneficial to reduce the internal resistance and improve the performance of the battery cell 20, while also alleviating the polarization phenomenon of the battery cell 20.

In some embodiments, referring to FIGS. 8 and 9 , along the radial direction Y of the conductive pillar, the particle diameter of the second reaction layer 251 close to the first active material layer 24 among the plurality of second reaction layers 251 is smaller than the particle diameters of other second reaction layers 251 .

Among them, the particle diameter of the second reaction layer 251 close to the first active material layer 24 among the multiple second reaction layers 251 is smaller than the particle diameters of other second reaction layers 251, that is, the second reaction layer 251 closest to the first active material layer 24 among the multiple second reaction layers 251 has the smallest particle size.

By setting the particle diameter of the second reaction layer 251 close to the first active material layer 24 to be smaller than the particle diameter of other second reaction layers 251, the dynamics of the second reaction layer 251 close to the first active material layer 24 is made better, so that the metal ions can diffuse into other second reaction layers 251, which is beneficial to reduce the internal resistance and improve the performance of the battery cell 20, and at the same time alleviate the polarization phenomenon of the battery cell 20.

According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the number of the second reaction layers 251 of the second active material layer 25 is N ₂ , satisfying 2≤N ₂ ≤3.

The number of the second reaction layers 251 of the second active material layer 25 may be 2 or 3. For example, in FIG. 9 , the second active material layer 25 includes two second reaction layers 251 stacked along the radial direction Y of the conductive column.

By setting the number of second reaction layers 251 of the second active material layer 25 to 2 to 3, on the one hand, the phenomenon of poor electrolyte infiltration caused by too small a number of second reaction layers 251 can be alleviated to ensure the performance of the battery cell 20; on the other hand, the manufacturing difficulty of the second active material layer 25 caused by too many second reaction layers 251 and the risk of falling off can be reduced.

According to some embodiments of the present application, referring to FIG. 10 and FIG. 11, FIG. 10 is a structural explosion diagram of a battery cell 20 provided in some other embodiments of the present application, and FIG. 11 is a cross-sectional view of a first active material layer 24 of a battery cell 20 provided in some other embodiments of the present application. A first notch groove 243 is provided on the surface of the first active material layer 24 facing the second active material layer 25, and the first notch groove 243 is used to accommodate an electrolyte. And/or, a second notch groove 252 is provided on the surface of the second active material layer 25 facing the first active material layer 24, and the second notch groove 252 is used to accommodate an electrolyte.

Among them, a first notch groove 243 is provided on the surface of the first active material layer 24 facing the second active material layer 25, that is, the first active material layer 24 is provided with a groove for accommodating the electrolyte on the surface facing the second active material layer 25; similarly, a second notch groove 252 is provided on the surface of the second active material layer 25 facing the first active material layer 24, that is, the second active material layer 25 is provided with a groove for accommodating the electrolyte on the surface facing the first active material layer 24.

Optionally, the first notch groove 243 and the second notch groove 252 may have various structures. For example, the first notch groove 243 and the second notch groove 252 may be an annular structure extending along the circumference of the conductive pillar 22 , or may be a strip structure extending along the first direction X.

In the embodiment where the first active material layer 24 includes a plurality of first reaction layers 242 stacked along the radial direction Y of the conductive pillar, the first notch groove 243 is disposed on the surface of the first reaction layer 242 closest to the second active material layer 25 in the radial direction Y of the conductive pillar among the plurality of first reaction layers 242, facing the second active material layer 25. Similarly, in the embodiment where the second active material layer 25 includes a plurality of second reaction layers 251 stacked along the radial direction Y of the conductive pillar, the second notch groove 252 is disposed on the surface of the second reaction layer 251 closest to the first active material layer 24 in the radial direction Y of the conductive pillar among the plurality of second reaction layers 251, facing the first active material layer 24.

It should be noted that in Figures 10 and 11, a first notch groove 243 is provided on the first active material layer 24 of the battery cell 20, and a second notch groove 252 is provided on the second active material layer 25 of the battery cell 20. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 may also only have the first notch groove 243 provided on the surface of the first active material layer 24 facing the second active material layer 25, or may only have the second notch groove 252 provided on the surface of the second active material layer 25 facing the first active material layer 24.

By providing a first notch groove 243 for accommodating an electrolyte on the surface of the first active material layer 24 facing the second active material layer 25, the battery cell 20 of this structure can effectively improve the first active material layer 24's ability to retain the electrolyte, and can improve the electrolyte's infiltration effect on the first active material layer 24, thereby facilitating the improvement of the performance of the battery cell 20. Similarly, by providing a second notch groove 252 for accommodating an electrolyte on the surface of the second active material layer 25 facing the first active material layer 24, the battery cell 20 of this structure can effectively improve the second active material layer 25's ability to retain the electrolyte, and can improve the electrolyte's infiltration effect on the second active material layer 25, thereby facilitating the improvement of the performance of the battery cell 20.

According to some embodiments of the present application, as shown in FIG. 10 and FIG. 11 , the first active material layer 24 is an annular structure extending along the circumference of the conductive pillar 22 , and the first notch groove 243 extends along the circumference of the conductive pillar 22 .

The first notched groove 243 extends along the circumference of the conductive pillar 22, that is, the first notched groove 243 is an annular structure extending along the circumference of the conductive pillar 22, that is, the first notched groove 243 is arranged around the entire circumference of the surface of the first active material layer 24 facing the second active material layer 25. Of course, in other embodiments, the first notched groove 243 may also be a structure extending along the first direction X.

By setting the first notch groove 243 as an annular structure extending along the circumference of the conductive column 22, it is helpful to increase the capacity of the first notch groove 243 for the electrolyte, thereby effectively improving the liquid retention capacity of the first active material layer 24 to ensure the electrolyte infiltration effect of the first active material layer 24.

In some embodiments, please continue to refer to FIG. 10 and FIG. 11 , there are a plurality of first notch grooves 243 , and the plurality of first notch grooves 243 are arranged along the first direction X at intervals.

The plurality of first notch grooves 243 are arranged at intervals along the first direction X, that is, the plurality of first notch grooves 243 are arranged along the first direction X.

It should be noted that if the first notch grooves 243 are structures extending along the first direction X, a plurality of first notch grooves 243 may be arranged at intervals along the circumferential direction of the conductive pillar 22 .

By providing a plurality of first notched grooves 243 disposed on the surface of the first active material layer 24 and the plurality of first notched grooves 243 are spaced apart along the first direction X, the liquid retention capacity of the first active material layer 24 and the electrolyte infiltration effect are further improved, thereby improving the performance of the battery cell 20 .

According to some embodiments of the present application, as shown in FIG. 10 , the second active material layer 25 is an annular structure extending along the circumference of the conductive pillar 22 , and the second notch groove 252 extends along the circumference of the conductive pillar 22 .

The second notched groove 252 extends along the circumference of the conductive pillar 22, that is, the second notched groove 252 is an annular structure extending along the circumference of the conductive pillar 22, that is, the second notched groove 252 is arranged around the entire circumference of the surface of the second active material layer 25 facing the first active material layer 24. Of course, in other embodiments, the second notched groove 252 may also be a structure extending along the first direction X.

By setting the second notch groove 252 as an annular structure extending along the circumference of the conductive column 22, that is, the second notch groove 252 is set around the entire circumference of the second active material layer 25, it is beneficial to increase the capacity of the second notch groove 252 for the electrolyte, and thus can effectively improve the liquid retention capacity of the first active material layer 24, so as to ensure the wetting effect of the electrolyte of the first active material layer 24.

In some embodiments, please continue to refer to FIG. 10 , there are a plurality of second notched grooves 252 , and the plurality of second notched grooves 252 are arranged along the first direction X at intervals.

The plurality of second notch grooves 252 are arranged at intervals along the first direction X, that is, the plurality of second notch grooves 252 are arranged along the first direction X.

It should be noted that if the second notch grooves 252 are structures extending along the first direction X, a plurality of second notch grooves 252 may be arranged at intervals along the circumferential direction of the conductive pillar 22 .

By providing a plurality of second notched grooves 252 disposed on the surface of the second active material layer 25 , and the plurality of second notched grooves 252 are spaced apart along the first direction X, the liquid retention capacity of the second active material layer 25 and the electrolyte infiltration effect are further improved, thereby improving the performance of the battery cell 20 .

According to some embodiments of the present application, as shown in FIG3, FIG4 and FIG5, the end cover 23 includes a cover body 231 and a pole 232. The cover body 231 covers the opening 212. The pole 232 is insulated and installed on the cover body 231. The conductive pole 22 is connected to the pole 232.

The cover body 231 of the end cover 23 is provided with a pole 232 , which is insulated and mounted on the cover body 231 . The pole 232 is connected to the conductive column 22 so as to serve as an output pole of the battery cell 20 through the pole 232 .

The pole 232 is insulated and installed on the cover body 231 , that is, there is no electrical connection between the pole 232 and the cover body 231 , that is, an insulating member is provided between the pole 232 and the cover body 231 , so that there is no electrical connection between the pole 232 and the cover body 231 .

Optionally, the conductive column 22 and the pole 232 may be an integrated structure or a split structure. If the conductive column 22 and the pole 232 are an integrated structure, the conductive column 22 and the pole 232 may be formed by a process such as casting or turning; if the conductive column 22 and the pole 232 are a split structure, the conductive column 22 and the pole 232 may be assembled and connected by a process such as welding, clamping or bolting.

By connecting the conductive column 22 with the pole 232 insulated and installed on the cover body 231, the input or output of electrical energy of the battery cell 20 can be realized through the pole 232, thereby alleviating the short circuit phenomenon between the conductive column 22 and the shell 21 through the cover body 231, which is beneficial to reduce the safety hazard of the battery cell 20 during use.

In some embodiments, the conductive column 22 and the electrode column 232 are integrally formed.

The conductive column 22 and the pole 232 are an integrally formed structure, that is, the conductive column 22 and the pole 232 are an integrated structure.

In other embodiments, the pole 232 and the conductive column 22 may also be a split structure, and the conductive column 22 is connected to the pole 232. Exemplarily, the pole 232 and the conductive column 22 may be connected in a variety of ways, and the conductive column 22 may be directly connected to the pole 232, such as welding or abutting. Of course, the conductive column 22 may also be indirectly connected to the pole 232, such as the conductive column 22 is first welded or abutted with other components, and then welded or abutted with the pole 232.

By configuring the conductive column 22 and the pole 232 as an integrally formed structure, the battery cell 20 adopting such a structure is beneficial to improving the connection stability and reliability between the conductive column 22 and the pole 232 to ensure the flow conduction area, and is also convenient for assembling the conductive column 22 and the end cover 23 as a whole with the shell 21, which is beneficial to reducing the difficulty of assembling the battery cell 20 and improving the assembly efficiency of the battery cell 20.

According to some embodiments of the present application, referring to FIG. 4 and FIG. 5 , the first active material layer 24 is a negative electrode active material layer, and the second active material layer 25 is a positive electrode active material layer.

Of course, in other embodiments, the first active material layer 24 may also be a positive electrode active material layer, and correspondingly, the second active material layer 25 is a negative electrode active material layer.

The first active material layer 24 arranged on the side of the shell 21 facing the accommodating cavity 211 is a negative electrode active material layer, and correspondingly, the second active material layer 25 arranged on the outer peripheral surface of the conductive column 22 is a positive electrode active material layer, so that the negative electrode active material layer can be coated on the outside of the positive electrode active material layer. The battery cell 20 adopting this structure can effectively reduce the risk of lithium plating to improve the safety of the battery cell 20.

According to some embodiments of the present application, as shown in FIG4 and FIG5 , the battery cell 20 further includes a separator 26 . The separator 26 is disposed between the first active material layer 24 and the second active material layer 25 to separate the first active material layer 24 and the second active material layer 25 .

Among them, in the embodiment where both the first active material layer 24 and the second active material layer 25 extend along the circumference of the conductive column 22, the isolation membrane 26 is an annular structure extending along the circumference of the conductive column 22, that is, the isolation membrane 26 is coated on the outer peripheral side of the second active material layer 25, so that the isolation membrane 26 can effectively separate the first active material layer 24 and the second active material layer 25.

For example, the material of the isolation film 26 may be polypropylene (PP) or polyethylene (PE).

In some embodiments, the shape of the isolation membrane 26 matches the outer peripheral surface of the second active material layer 25, that is, the shape of the isolation membrane 26 is the same as the shape of the outer peripheral surface of the second active material layer 25. As shown in FIG6, if the cross-section of the outer peripheral surface of the second active material layer 25 perpendicular to the first direction X is circular, the isolation membrane 26 is a cylindrical hollow structure; as shown in FIG7, if the cross-section of the outer peripheral surface of the second active material layer 25 perpendicular to the first direction X is hexagonal, the isolation membrane 26 is a hexagonal hollow structure.

The battery cell 20 is also provided with an isolation membrane 26 located between the first active material layer 24 and the second active material layer 25, so as to effectively realize the insulation isolation between the first active material layer 24 and the second active material layer 25, so as to reduce the short circuit phenomenon between the first active material layer 24 and the second active material layer 25, thereby helping to reduce the safety hazards of the electrode assembly during use.

According to some embodiments of the present application, a battery 100 is further provided, and the battery 100 includes a battery cell 20 of any of the above schemes.

According to some embodiments of the present application, the embodiments of the present application also provide an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device; or, the electrical device includes a battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

The electrical device may be any of the aforementioned devices or systems using the battery cell 20 or the battery 100 .

According to some embodiments of the present application, referring to FIGS. 3 to 4 and 8 to 11 , the present application provides a battery cell 20 , which includes a housing 21 , a conductive column 22 , an end cover 23 , and an isolation membrane 26 .

The housing 21 has a receiving cavity 211 formed inside. An opening 212 communicating with the receiving cavity 211 is provided at one end of the housing 21 along the first direction X. A first active material layer 24 is provided on the surface of the housing 21 facing the receiving cavity 211. The first active material layer 24 is a negative electrode active material layer. The housing 21 is a columnar structure. The central axis of the housing 21 extends along the first direction X. The length of the housing 21 along the first direction X is L. The maximum dimension of the cross section of the housing 21 perpendicular to the first direction X in the direction perpendicular to the first direction X is D ₁ , satisfying L ≥ D ₁ . The conductive column 22 extends along the first direction X and is inserted into the receiving cavity 211. A second active material layer 25 is provided on the outer peripheral surface of the conductive column 22. The second active material layer 25 faces the first active material layer 24. The second active material layer 25 is a positive electrode active material layer. The end cover 23 includes a cover body 231 and a pole 232. The cover body 231 covers the opening 212. The pole 232 is insulated and installed on the cover body 231. The conductive column 22 and the pole 232 are an integrally formed structure. The isolation membrane 26 is arranged between the first active material layer 24 and the second active material layer 25 to separate the first active material layer 24 and the second active material layer 25. Among them, the first active material layer 24 and the second active material layer 25 are both annular structures extending along the circumference of the conductive column 22. The first active material layer 24 is surrounded along the circumference of the conductive column 22 to form an installation channel 241 for inserting the conductive column 22. The cross section of the installation channel 241 perpendicular to the first direction X is circular, and the inner surface of the installation channel 241 fits with the outer peripheral surface of the second active material layer 25. The first active material layer 24 includes two first reaction layers 242, which are stacked along the radial direction Y of the conductive column. Along the radial direction Y of the conductive column, the density of the first reaction layer 242 close to the second active material layer 25 of the two first reaction layers 242 is less than the density of the other first reaction layer 242, and the particle diameter of the first reaction layer 242 close to the second active material layer 25 of the two first reaction layers 242 is smaller than the particle diameter of the other first reaction layer 242. The second active material layer 25 includes two second reaction layers 251, which are stacked along the radial direction Y of the conductive column. Along the radial direction Y of the conductive column, the density of the second reaction layer 251 close to the first active material layer 24 of the two second reaction layers 251 is less than the density of the other second reaction layer 251, and the particle diameter of the second reaction layer 251 close to the first active material layer 24 of the two second reaction layers 251 is smaller than the particle diameter of the other second reaction layer 251. A plurality of first notched grooves 243 are provided on the surface of the first active material layer 24 facing the second active material layer 25. The first notched grooves 243 are used to contain electrolyte. The first active material layer 24 is an annular structure extending along the circumference of the conductive pillar 22, and the plurality of first notched grooves 243 are arranged at intervals along the first direction X. A plurality of second notched grooves 252 are provided on the surface of the second active material layer 25 facing the first active material layer 24. The second notched grooves 252 are used to contain electrolyte. The second active material layer 25 is an annular structure extending along the circumference of the conductive pillar 22, and the plurality of second notched grooves 252 are arranged at intervals along the first direction X.

According to some embodiments of the present application, the present application also provides a method for manufacturing a battery cell 20. Referring to FIG. 12, FIG. 12 is a schematic flow chart of a method for manufacturing a battery cell 20 provided in some embodiments of the present application. The manufacturing method includes:

S100: providing a housing 21, a conductive column 22 and an end cover 23, wherein a receiving cavity 211 is formed inside the housing 21, and an opening 212 communicating with the receiving cavity 211 is provided at one end of the housing 21 along a first direction X, and the conductive column 22 extends along the first direction X;

S200: Disposing a first active material layer 24 on a side of the housing 21 facing the receiving cavity 211;

S300: Connect the conductive column 22 to the end cap 23;

S400: Disposing a second active material layer 25 on the outer peripheral surface of the conductive column 22, wherein the second active material layer 25 has a polarity opposite to that of the first active material layer 24;

S500 : inserting the conductive pillar 22 into the accommodating cavity 211 of the housing 21 along the first direction X so that the first active material layer 24 and the second active material layer 25 face each other, and the end cover 23 covers the opening 212 .

In step S200, the first active material layer 24 is directly coated on the surface of the housing 21 facing the accommodating cavity 211, that is, the first active material layer 24 is coated on the cavity wall of the accommodating cavity 211. Of course, in some embodiments, the first active material layer 24 may be first coated on a current collector made of metal foil, and then the current collector coated with the first active material layer 24 is arranged in the accommodating cavity 211 of the housing 21, and the current collector is connected to the surface of the housing 21 facing the accommodating cavity 211.

In step S500, the conductive column 22 is inserted into the accommodating cavity 211 of the shell 21 along the first direction X, that is, the conductive column 22 provided with the second active material layer 25 is inserted into the accommodating cavity 211 of the shell 21 along the first direction X, so that the first active material layer 24 and the second active material layer 25 are arranged facing each other in the radial direction Y of the conductive column.

Exemplarily, the first active material layer 24 is coated on the surface of the housing 21 facing the receiving cavity 211 by a dry coating process. Similarly, the second active material layer 25 is coated on the outer peripheral surface of the conductive column 22 by a dry coating process.

In the above manufacturing method, a first active material layer 24 is firstly arranged on a side of the shell 21 facing the accommodating cavity 211, and the second active material layer 25 is arranged on the outer peripheral surface of the conductive column 22 after the conductive column 22 is connected to the end cover 23. Then, the conductive column 22 provided with the second active material layer 25 is inserted into the accommodating cavity 211 of the shell 21 along the first direction X, so that the first active material layer 24 and the second active material layer 25 are arranged facing each other, and at the same time, the end cover 23 and the opening 212 are covered with each other, thereby completing the assembly and manufacturing of the battery cell 20. The battery cell 20 manufactured by this manufacturing method does not need to wind the pole piece, and saves the process of assembling and connecting the current collecting component and the pole ear, thereby greatly optimizing the production process and production rhythm of the battery cell 20, which is conducive to improving the production efficiency of the battery cell 20.

According to some embodiments of the present application, referring to FIG. 13 , FIG. 13 is a schematic flow chart of a method for manufacturing a battery cell 20 provided in some embodiments of the present application. The method for manufacturing the battery cell 20 further includes:

S600: providing an isolation film 26;

Before the conductive pillar 22 is inserted into the receiving cavity 211 of the housing 21 along the first direction X in step S500 so that the first active material layer 24 and the second active material layer 25 face each other and the end cover 23 is covered on the opening 212, the manufacturing method of the battery cell 20 further includes:

S700 : Covering the separator 26 on the outer side of the second active material layer 25 .

Among them, step S500 is performed after step S700, which means that the conductive column 22 provided with the second active material layer 25 and coated with the isolation film 26 is inserted into the accommodating cavity 211 of the shell 21 along the first direction X, so that the first active material layer 24 and the second active material layer 25 are arranged facing each other, and the isolation film 26 is located between the first active material layer 24 and the second active material layer 25.

It should be noted that, in FIG. 13 , step S600 is arranged after step S400 . Of course, in some embodiments, step S600 may be arranged before or after any step before step S700 .

In the above-mentioned manufacturing method, before the conductive column 22 provided with the second active material layer 25 is inserted into the accommodating cavity 211 of the shell 21, the isolation membrane 26 is first coated on the outside of the second active material layer 25, so that when the conductive column 22 is inserted into the accommodating cavity 211 of the shell 21, the isolation membrane 26 can be assembled into the shell 21 at the same time, and the isolation membrane 26 can be arranged between the first active material layer 24 and the second active material layer 25. This manufacturing method can improve the assembly efficiency of the isolation membrane 26 on the one hand, and reduce the difficulty of assembling the isolation membrane 26 on the other hand.

It should be noted that the relevant structure of the battery cell 20 manufactured by the manufacturing method provided by the above embodiments can refer to the battery cell 20 provided by the above embodiments, and will not be described again here.

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

A battery cell, comprising:

A shell having a receiving cavity formed therein, one end of the shell being provided with an opening communicating with the receiving cavity along a first direction, and a first active material layer being provided on a side of the shell facing the receiving cavity;

a conductive column extending along the first direction and inserted into the accommodating cavity, wherein a second active material layer is disposed on an outer peripheral surface of the conductive column, the second active material layer and the first active material layer are disposed facing each other, and the second active material layer and the first active material layer have opposite polarities; and

The end cover covers the opening and is connected to the conductive column.
The battery cell according to claim 1, wherein the first active material layer is coated on a surface of the shell facing the accommodating cavity.
The battery cell according to claim 1 or 2, wherein the shell is a columnar structure, and the central axis of the shell extends along the first direction.
The battery cell according to claim 3, wherein along the first direction, the length of the shell is L, the maximum dimension of the cross section of the shell perpendicular to the first direction is D 1 , and L ≥ D 1 is satisfied.
The battery cell according to claim 4, wherein 1.5≤L/D 1 ; and/or

L/ D1 ≤25.
The battery cell according to any one of claims 1 to 5, wherein the first active material layer and the second active material layer are both annular structures extending along the circumference of the conductive column.
The battery cell according to claim 6, wherein the first active material layer surrounds the conductive column along the circumference to form a mounting channel for inserting the conductive column, and the inner surface of the mounting channel fits with the outer circumferential surface of the second active material layer.
The battery cell according to claim 7, wherein a cross section of the mounting channel perpendicular to the first direction is circular.
The battery cell according to any one of claims 1 to 8, wherein the first active material layer comprises a plurality of first reaction layers, and the plurality of first reaction layers are stacked along the radial direction of the conductive column.
The battery cell according to claim 9, wherein along the radial direction of the conductive column, the density of the first reaction layer close to the second active material layer among the plurality of first reaction layers is less than the density of the other first reaction layers.
The battery cell according to claim 9 or 10, wherein, along the radial direction of the conductive column, a particle diameter of the first reaction layer close to the second active material layer among the plurality of first reaction layers is smaller than a particle diameter of other first reaction layers.
The battery cell according to any one of claims 9 to 11, wherein the number of the first reaction layers of the first active material layer is N 1 , satisfying 2≤N 1 ≤3.
The battery cell according to any one of claims 1 to 12, wherein the second active material layer comprises a plurality of second reaction layers, and the plurality of second reaction layers are stacked along the radial direction of the conductive column.
The battery cell according to claim 13, wherein, along the radial direction of the conductive column, the density of the second reaction layer close to the first active material layer among the plurality of second reaction layers is less than the density of other second reaction layers.
The battery cell according to claim 13 or 14, wherein, along the radial direction of the conductive column, a particle diameter of the second reaction layer close to the first active material layer among the plurality of second reaction layers is smaller than a particle diameter of other second reaction layers.
The battery cell according to any one of claims 13 to 15, wherein the number of the second reaction layers in the second active material layer is N 2 , satisfying 2≤N 2 ≤3.
The battery cell according to any one of claims 1 to 16, wherein a first notch groove is provided on a surface of the first active material layer facing the second active material layer, and the first notch groove is used to accommodate an electrolyte; and/or

A second notch groove is provided on a surface of the second active material layer facing the first active material layer, and the second notch groove is used to contain an electrolyte.
The battery cell according to claim 17, wherein the first active material layer is an annular structure extending along the circumference of the conductive column, and the first notch groove extends along the circumference of the conductive column.
The battery cell according to claim 18, wherein the number of the first notch grooves is plural, and the plurality of the first notch grooves are spaced apart along the first direction.
The battery cell according to any one of claims 17 to 19, wherein the second active material layer is an annular structure extending along the circumference of the conductive column, and the second notch groove extends along the circumference of the conductive column.
The battery cell according to claim 20, wherein the number of the second notch grooves is plural, and the plurality of the second notch grooves are spaced apart along the first direction.
The battery cell according to any one of claims 1 to 21, wherein the end cover comprises:

A cover body, covering the opening;

A pole, insulated and mounted on the cover body;

Wherein, the conductive column is connected to the pole.
The battery cell according to claim 22, wherein the conductive column and the electrode column are an integrally formed structure.
The battery cell according to any one of claims 1 to 23, wherein the first active material layer is a negative electrode active material layer, and the second active material layer is a positive electrode active material layer.
The battery cell according to any one of claims 1 to 24, wherein the battery cell further comprises:

The isolation film is disposed between the first active material layer and the second active material layer to separate the first active material layer from the second active material layer.
A battery comprising the battery cell according to any one of claims 1 to 25.
An electrical device, comprising a battery cell according to any one of claims 1 to 25, wherein the battery cell is used to provide electrical energy; or

Comprising a battery as claimed in claim 26, the battery is used to provide electrical energy.
A method for manufacturing a battery cell, comprising:

A housing, a conductive column and an end cover are provided, wherein a receiving cavity is formed inside the housing, an opening communicating with the receiving cavity is provided at one end of the housing along a first direction, and the conductive column extends along the first direction;

A first active material layer is disposed on a side of the shell facing the accommodating cavity;

connecting the conductive column to the end cap;

Disposing a second active material layer on the outer peripheral surface of the conductive column, wherein the second active material layer has a polarity opposite to that of the first active material layer;

The conductive column is inserted into the accommodating cavity of the shell along the first direction, so that the first active material layer and the second active material layer are arranged facing each other, and the end cover is covered on the opening.
The method for manufacturing a battery cell according to claim 28, wherein the method for manufacturing a battery cell further comprises:

Provide isolation film;

Before inserting the conductive column into the accommodating cavity of the housing along the first direction so that the first active material layer and the second active material layer are arranged facing each other and the end cover is closed on the opening, the manufacturing method of the battery cell further includes:

The isolation film is coated on the outer side of the second active material layer.