CN116762211A

CN116762211A - Shell, battery cell, battery, electric equipment and manufacturing method of battery cell

Info

Publication number: CN116762211A
Application number: CN202180092243.0A
Authority: CN
Inventors: 王志超; 姜利文
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2023-09-15
Also published as: WO2023004827A1

Abstract

The application provides a shell, a battery monomer, a battery, electric equipment and a manufacturing method of the battery monomer, and relates to the technical field of batteries. The housing includes a first shell, a second shell, and an insulator. The first shell is used for being electrically connected with the first tab. The second shell is used for being electrically connected with the second lug, and the second shell and the first shell are arranged at intervals along the first direction. The insulator is configured to be at least partially disposed between the first housing and the second housing to insulate the first housing and the second housing. The first shell and the second shell are arranged at intervals along the first direction, the first shell and the second shell have no overlapped part, the waste of shell space is avoided, and the energy density of the battery is improved. In addition, the first and second cases are respectively used for being electrically connected with the first and second tabs, and then the case may not be provided with an end cap, without reserving a space for the end cap, so that the inner space of the case can be sufficiently used for accommodating the electrode assembly and the electrolyte, thereby improving the energy density of the battery.

Description

Shell, battery cell, battery, electric equipment and manufacturing method of battery cell

Technical Field

The application relates to the technical field of batteries, in particular to a shell, a battery cell, a battery, electric equipment and a manufacturing method of the battery cell.

Background

At present, with the rapid development of smart phones, tablet personal computers, electric automobiles and the like, the application of lithium ion batteries is increasingly wide, so that higher requirements are also put forward for the lithium batteries. People pay attention to the safety performance of the battery and meanwhile also require that the lithium battery has better energy density, and the battery with high energy density can meet the longer-time electricity utilization requirement of electric equipment. Therefore, how to increase the energy density of the battery is a problem to be solved in the battery technology field.

Disclosure of Invention

The embodiment of the application provides a shell, a battery monomer, a battery, electric equipment and a manufacturing method of the battery monomer so as to improve the energy density of the battery.

In a first aspect, embodiments of the present application provide a case for accommodating an electrode assembly including first and second tabs having opposite polarities, including a first case, a second case, and an insulating member. The first shell is used for being electrically connected with the first tab. The second shell is used for being electrically connected with the second lug, and the second shell and the first shell are arranged at intervals along the first direction. The insulator is configured to be at least partially disposed between the first housing and the second housing to insulate the first housing and the second housing.

In the above technical scheme, the first shell and the second shell are arranged at intervals along the first direction, and the first shell and the second shell have no overlapped part, so that the waste of shell space is avoided, and the energy density of the battery is improved. In addition, first casing is used for being connected with first utmost point ear electricity, and the second casing is used for being connected with the second utmost point ear electricity, and then the shell can not set up the end cover, and the shell need not reserve space for the end cover to make the inner space of shell can be fully used for holding electrode assembly and electrolyte, thereby improve the energy density of battery, satisfy the demand of high energy density.

In some embodiments of the first aspect of the present application, the insulating member includes a connector configured to be in plug-fit with the first housing and the second housing, and a separator connected to the connector, the separator configured to separate the first housing and the second housing in the first direction to insulate the first housing and the second housing.

According to the technical scheme, the connector of the insulating piece is used for being in plug-in fit with the first shell and the second shell, so that the first shell and the second shell are arranged at intervals in the first direction, the first shell and the second shell are kept in a state of being fixed in relative positions, so that the shell structure is stable, the first shell and the second shell are connected with the insulating piece in a simple plug-in fit mode, the separator of the insulating piece is arranged between the first shell and the second shell in the first direction to insulate the first shell and the second shell, and therefore the insulating piece not only plays a role of insulating and isolating the first shell and the second shell, but also plays a role of connecting the first shell and the second shell to enable the first shell and the second shell to be kept in an interval arrangement state.

In some embodiments of the first aspect of the present application, the separator is sealingly connected to the first housing and the second housing.

In the above technical scheme, the separator is in sealing connection with the first casing and the second casing to make in first direction, sealing connection between first casing and the separator, between second casing and the separator improves the sealing performance of shell, reduces the risk of shell weeping.

In some embodiments of the first aspect of the application, the housing further comprises a first seal at least partially between the first housing and the separator in the first direction to effect a sealed connection of the separator to the first housing, and a second seal at least partially between the second housing and the separator to effect a sealed connection of the separator to the second housing.

In the technical scheme, the first shell and the separator are in sealing connection through the first sealing piece, and the second shell and the separator are in sealing connection through the second sealing piece, so that the sealing performance between the separator and the first shell and between the separator and the second shell is better.

In some embodiments of the first aspect of the present application, the connector is enclosed on an outer side of the first housing and the second housing.

In the technical scheme, the connecting body encloses the outer sides of the first shell and the second shell, so that the connecting body is convenient to connect with the first shell and the second shell.

In some embodiments of the first aspect of the present application, the connecting body is formed with a first protrusion configured to be connected with an outer peripheral surface of the first housing and a second protrusion configured to be connected with an outer peripheral surface of the second housing.

In the technical scheme, the connecting body is connected with the outer peripheral surface of the first shell through the first convex part, and is connected with the outer peripheral surface of the second shell through the second convex part, so that the structural strength of the connecting body is prevented from being influenced by the direct connection of the connecting body with the first shell and the second shell.

In some embodiments of the first aspect of the present application, the separator and the connector are an integrally formed structure.

Among the above-mentioned technical scheme, the separator is integrated into one piece structure with the connector, and the insulating part installation of being convenient for can improve the structural strength of insulating part.

In some embodiments of the first aspect of the present application, the first case is formed with a first receiving space having a first opening, the first receiving space being configured to receive a portion of the electrode assembly; the second case is formed with a second receiving space having a second opening configured to receive a portion of the electrode assembly.

In the above technical scheme, the first casing has first accommodation space, and the second casing has second accommodation space, and first accommodation space and second accommodation space can hold the part of electrode assembly respectively, during the installation, can all overlap first casing and second casing and establish electrode assembly's periphery, utilize electrode assembly to fix a position first casing and second casing, the location installation when being convenient for the shell installation.

In some embodiments of the first aspect of the present application, the first case includes a first end wall and a first sidewall, the first sidewall is disposed around an edge of the first end wall, the first sidewall is configured to accommodate a portion of the electrode assembly, an inner surface of the first end wall is formed with a third protrusion configured to be connected with the first tab, and a first accommodating cavity is formed between an inner circumferential surface of the first sidewall and an outer circumferential surface of the third protrusion, the first accommodating cavity is configured to accommodate an electrolyte.

In the above technical solution, the third protrusion on the inner surface of the first end wall is configured to be electrically connected to the first tab to electrically connect the first housing and the first tab, and a first accommodating cavity is formed between the inner peripheral surface of the first side wall and the outer peripheral surface of the third protrusion, and the first accommodating cavity is configured to accommodate electrolyte, so that more electrolyte can be accommodated in the housing, and the electrode assembly is fully infiltrated.

In some embodiments of the first aspect of the present application, the first end wall has a first concave portion formed thereon that is concave inward from an outer surface of the first end wall, and the third convex portion is formed at a position of an inner surface of the first end wall corresponding to the first concave portion.

In the above-described aspect, the first recess can provide an installation position for a structure outside the housing, such as the bus bar member. The third convex part is formed on the inner wall of the first end wall, the processing difficulty angle is formed, and the difficulty of forming the first concave part on the outer surface of the first end wall is lower than that of directly forming the third convex part on the inner surface of the first end wall, so that the third convex part protruding out of the inner surface of the first end wall is formed at the position of the inner surface of the first end wall corresponding to the first concave part, and the forming difficulty of the third convex part is reduced.

In some embodiments of the first aspect of the application, the first housing is arranged coaxially with the second housing.

In the above technical scheme, the first casing and the second casing are coaxially arranged, so that the space inside the casing is more regular, and the installation of the electrode assembly is facilitated.

In some embodiments of the first aspect of the application, the outer diameter of the first housing is equal to the outer diameter of the second housing.

In the technical scheme, the outer diameter of the first shell is equal to the outer diameter of the second shell, so that the outer shape of the shell is more regular, and the placement of the battery is facilitated.

In some embodiments of the first aspect of the application, the inner diameter of the first housing is equal to the inner diameter of the second housing.

In the above technical scheme, the internal diameter of the first casing is equal to the internal diameter of the second casing, so that the space inside the casing is more regular, the installation of the electrode assembly is convenient, and the space of the casing can be fully utilized.

In a second aspect, embodiments of the present application provide a battery cell including an electrode assembly and a casing provided by embodiments of the first aspect. The electrode assembly is accommodated in the shell and comprises a first tab and a second tab, the polarities of the first tab and the second tab are opposite, the first tab is electrically connected with the first shell, and the second tab is electrically connected with the second shell.

In the above technical scheme, the first shell and the second shell of the shell are arranged at intervals along the first direction, and the first shell and the second shell have no overlapping parts in other directions perpendicular to the first direction, so that the waste of shell space is avoided, and the energy density of the battery is improved. In addition, first casing is used for being connected with first utmost point ear electricity, and the second casing is used for being connected with the second utmost point ear electricity, and then the shell can not set up the end cover, and the shell need not reserve space for the end cover to make the inner space of shell can be by electrode assembly and electrolyte make full use of, thereby improve the energy density of battery, satisfy high energy density's demand also.

In a third aspect, embodiments of the present application provide a battery, including the battery cell provided in the embodiment of the second aspect.

In the above technical scheme, the outer shell of the battery cell has no overlapping part so as to improve the energy density of the battery cell.

In a fourth aspect, an embodiment of the present application provides an electric device, including the battery monomer provided in the embodiment of the second aspect.

In the technical scheme, the shell of the battery monomer has no overlapped part, so that the energy density of the battery monomer is improved, and the longer-time electricity utilization requirement of electric equipment can be met.

In a fifth aspect, some embodiments of the present application provide a method for manufacturing a battery cell, including:

providing an electrode assembly comprising a first tab and a second tab of opposite polarity;

providing a first housing, a second housing and an insulator;

assembling the electrode assembly, the first case, the second case, and the insulating member such that the electrode assembly is received in a receiving space defined by the first case, the second case, and the insulating member and the first case and the second case are spaced apart in a first direction, and at least a portion of the insulating member is disposed between the first case and the second case to insulate the first case and the second case;

Electrically connecting the first tab with the first housing;

and electrically connecting the second lug with the second shell.

In the above technical scheme, the first shell and the second shell are arranged at intervals along the first direction, so that the first shell and the second shell have no overlapping part, and the energy density of the battery cell can be improved. The first shell is electrically connected with the first tab, the second shell is electrically connected with the second tab, the shell is not provided with an end cover, and the shell does not need to reserve space for the end cover, so that the inner space of the shell can be fully used for accommodating the electrode assembly and the electrolyte, the energy density of the battery is improved, and the requirement of high energy density is met.

In a sixth aspect, an embodiment of the present application provides an apparatus for manufacturing a battery cell, including a providing device, a first assembling device, and a second assembling device. The providing device is configured to provide an electrode assembly including first and second tabs of opposite polarities, a first case, a second case, and an insulator. The first assembling means is configured to assemble the electrode assembly, the first case, the second case, and the insulating member such that the electrode assembly is received in a receiving space defined by the first case, the second case, and the insulating member and the first case and the second case are arranged at intervals in a first direction, and at least a portion of the insulating member is disposed between the first case and the second case to insulate the first case and the second case. The second assembly device is configured to electrically connect the first tab with the first housing and the second tab with the second housing.

In the above technical scheme, the first assembling device is used for arranging the first shell and the second shell at intervals along the first direction, so that the first shell and the second shell have no overlapping part, and the energy density of the battery cell is improved. And the second assembly device is with first casing with first utmost point ear electricity is connected, second casing and second utmost point ear electricity are connected, then the shell can not set up the end cover, and the shell need not reserve space for the end cover to make the inner space of shell can be fully used for holding electrode assembly and electrolyte, thereby improve the energy density of battery, satisfy the demand of high energy density.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in some embodiments of the present application;

Fig. 3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

fig. 4 is an exploded view of a battery cell according to some embodiments of the present application;

fig. 5 is a cross-sectional view of a battery cell provided in some embodiments of the application;

FIG. 6 is an enlarged view of the portion I of FIG. 5;

FIG. 7 is an enlarged view at II in FIG. 5;

FIG. 8 is an enlarged view at III in FIG. 5;

fig. 9 is a flowchart of a method for manufacturing a battery cell according to some embodiments of the present application;

fig. 10 is a schematic block diagram of a manufacturing apparatus for a battery cell according to some embodiments of the present application.

Icon: 1000-vehicle; 100-cell; 10-a box body; 11-a receiving cavity; 12-a first part; 13-a second part; 20-battery cells; 21-a housing; 211-a first housing; 2111—a first accommodation space; 21111—a first opening; 2112-a first end wall; 21121-an inner surface of the first end wall; 21122-an outer surface of the first end wall; 2113-a first sidewall; 21131—an inner peripheral surface of the first sidewall; 2114-third protrusions; 21141-the outer peripheral surface of the third projection; 2115-a first receiving cavity; 2116-a first recess; 2117-an outer peripheral surface of the first housing; 212-a second housing; 2121-a second accommodation space; 21211-a second opening; 2122-a second end wall; 21221-an inner surface of the second end wall; 21222-an outer surface of the second end wall; 2123-a second sidewall; 21231-inner peripheral surfaces of the second side walls; 2124-fourth lobe; 21241-an outer peripheral surface of the fourth convex portion; 2125-a second receiving cavity; 2126-a second recess; 2127-an outer peripheral surface of the second housing; 213-insulator; 2131-linkers; 21311—a first cavity; 21312-a second lumen; 21313-outer circumferential surface of the connecting body; 2132-separator; 214-a first protrusion; 215-a second protrusion; 216—a first seal; 217-second seal; 22-electrode assembly; 221-a first tab; 2211-a first liquid inlet tank; 222-second pole ear; 2221-a second fluid sump; 200-a controller; 300-motor; a-a first direction; 2000-manufacturing equipment of battery cells; 2100-providing means; 2200-a first assembly device; 2300-second assembly device.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in place when the product of this application is used, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience of describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

The term "plurality" as used herein refers to two or more (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical, flat, rectangular or other shape, and the embodiment of the application is not limited thereto. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited in this embodiment.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

The development of battery technology is to consider various design factors, such as safety performance, cycle life, discharge capacity, charge-discharge rate, and other performance parameters, and also to consider the energy density of the battery.

Factors affecting the energy density of the battery cell include the ratio of the positive electrode active material to the negative electrode active material, and the structural volume and weight of the battery cell, such as the ratio of the separator, the ratio of the current collector, the size of the casing, and the like. The inventors have found that a first housing of a case of a battery cell is formed with a first receiving space, a second housing is formed with a second receiving space, a portion of an electrode assembly is received in the first receiving space, a portion of the electrode assembly is received in the second receiving space, the first housing is sleeved outside the second housing, an insulating member is radially disposed between an inner circumferential surface of the first housing and an outer circumferential surface of the second housing to achieve an insulating connection of the first housing and the second housing, the second housing and the insulating member occupy a portion of the space within the first housing, and a space in which the electrode assembly and an electrolyte can be used within the first housing is reduced, thereby affecting an energy density of the battery cell.

In view of this, the embodiment of the application provides a technical solution, in which the first casing and the second casing are arranged at intervals along the first direction, so that the first casing and the second casing have no overlapping portion, thereby avoiding the waste of the casing space and improving the energy density of the battery.

The technical scheme described by the embodiment of the application is suitable for the battery and the electric equipment using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

Referring to fig. 1, a battery 100 is disposed in the vehicle 1000, and the battery 100 may be disposed at the bottom or at the head or at the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, the battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10.

The case 10 is provided to accommodate the battery cells 20 with the accommodating chambers 11. In some embodiments, the case 10 may include a first portion 12 and a second portion 13, the first portion 12 and the second portion 13 being overlapped with each other to define a receiving chamber 11 for receiving the battery cell 20. Of course, the connection between the first portion 12 and the second portion 13 may be sealed by a sealing member (not shown), which may be a sealing ring, a sealant, or the like.

The first portion 12 and the second portion 13 may be of various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first portion 12 may be a hollow structure with one side opened, and the second portion 13 may be a hollow structure with one side opened, and the open side of the second portion 13 is closed to the open side of the first portion 12, so as to form the case 10 having the accommodating cavity 11. Of course, the first portion 12 may be a hollow structure with one side open, the second portion 13 may be a plate-like structure, and the second portion 13 may be covered on the open side of the first portion 12 to form the case 10 having the accommodating chamber 11.

In the battery 100, the number of the battery cells 20 may be one or a plurality. If there are multiple battery cells 20, the multiple battery cells 20 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, a plurality of battery cells 20 may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a whole and be accommodated in the case 10. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc. Fig. 2 exemplarily shows a case in which the battery cell 20 is in the shape of a cylinder.

In some embodiments, the battery 100 may further include a bus bar (not shown), through which the plurality of battery cells 20 may be electrically connected to each other, so as to realize serial connection, parallel connection, or a series-parallel connection of the plurality of battery cells 20.

Please refer to fig. 3 and fig. 4. The battery cell 20 may include a case 21 and an electrode assembly 22. The case 21 serves to accommodate the electrode assembly 22. The housing 21 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The shape of the case 21 may be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, the case 21 may alternatively have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the case 21 may alternatively have a rectangular parallelepiped structure. Fig. 3 and 4 exemplarily show a case where the case 21 and the electrode assembly 22 are cylindrical.

The material of the housing 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 22 may include a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separator (not shown). The electrode assembly 22 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or may be a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet. The electrode assembly 22 further includes a first tab 221 and a second tab 222 having opposite polarities, the first tab 221 may be a positive tab, the positive tab may be a positive current collector without a positive active material layer in a positive tab as a positive tab, the second tab 222 may be a negative tab, and the negative tab may be a negative current collector without a negative active material layer in a negative tab as a negative tab. Of course, the first tab 221 may be a negative tab, and the second tab 222 may be a positive tab.

The first tab 221 and the second tab 222 may be positioned at the same end of the electrode assembly 22, and the first tab 221 and the second tab 222 may be positioned at opposite ends of the electrode assembly 22. Fig. 4 illustrates a case where the first tab 221 and the second tab 222 are located at opposite ends of the electrode assembly 22.

As shown in fig. 4, the first tab 221 is provided with a first liquid inlet groove 2211, the first liquid inlet groove 2211 is used for allowing electrolyte to enter the interior of the electrode assembly 22 so that the isolating film of the electrode assembly 22 can be fully infiltrated by the electrolyte, the second tab 222 is provided with a second liquid inlet groove 2221, and the second liquid inlet groove 2221 is used for allowing the electrolyte to enter the interior of the electrode assembly 22 so that the isolating film of the electrode assembly 22 can be fully infiltrated by the electrolyte. The first liquid inlet groove 2211 and the second liquid inlet groove 2221 may be reserved when the first tab 221 and the second tab 222 are kneaded, or may be formed by other processes after the first tab 221 and the second tab 222 are kneaded. The sizes of the first and second liquid inlet tanks 2211 and 2221 may be set according to practical situations, for example, the lengths of the first and second liquid inlet tanks 2211 and 2221 may be 3mm and the widths may be 3mm.

Referring to fig. 4 and 5 in combination, in some embodiments, the housing 21 includes a first housing 211, a second housing 212, and an insulator 213. The first housing 211 is electrically connected to the first tab 221. The second housing 212 is configured to be electrically connected to the second tab 222, and the second housing 212 is spaced from the first housing 211 along the first direction a. The insulator 213 is configured to be at least partially disposed between the first housing 211 and the second housing 212 to insulate the first housing 211 and the second housing 212.

The first case 211, the second case 212, and the insulator 213 together define an accommodating space accommodating the electrode assembly 22, the first case 211 and the second case 212 are spaced apart in the first direction a, the first case 211 and the second case 212 have no overlapping portion, space waste of the case 21 is avoided, and energy density of the battery 100 is improved. In addition, the first housing 211 is used for being electrically connected with the first tab 221, the second housing 212 is used for being electrically connected with the second tab 222, and then the housing 21 may not be provided with an end cover, an electrode terminal, a switching part for connecting the tab with the electrode terminal, and the like, and the housing 21 does not need to reserve a space for the switching part, so that the internal space of the housing 21 can be fully used for accommodating the electrode assembly 22 and the electrolyte, thereby improving the volume utilization rate of the battery cell 20, improving the energy density of the battery 100, meeting the requirement of high energy density, and reducing the internal resistance and the cost.

The first tab 221 is electrically connected to the first housing 211, and the second tab 222 and the second housing 212 may be electrically connected by laser or ultrasonic welding technology.

Referring to fig. 5-8 in combination, in some embodiments, the first case 211 is formed with a first accommodation space 2111 having a first opening 21111, the first accommodation space 2111 being configured to accommodate a portion of the electrode assembly 22; the second case 212 is formed with a second receiving space 2121 having a second opening 21211, the second receiving space 2121 being configured to receive a portion of the electrode assembly 22. The first accommodation space 2111 and the second accommodation space 2121 can accommodate a part of the electrode assembly 22, respectively, and when the electrode assembly is mounted, the outer periphery of the electrode assembly 22 can be sleeved on the first housing 211 and the second housing 212, and the first housing 211 and the second housing 212 can be positioned by the electrode assembly 22, so that positioning and mounting are facilitated when the housing 21 is mounted.

In the first direction a, the first opening 21111 of the first housing 211 is provided facing the second opening 21211 of the second housing 212.

As shown in fig. 6, in some embodiments, the first case 211 includes a first end wall 2112 and a first side wall 2113, the first side wall 2113 is provided around an edge of the first end wall 2112, the first side wall 2113 is configured to accommodate a portion of the electrode assembly 22, an inner surface 21121 of the first end wall is formed with a third protrusion 2114, the third protrusion 2114 is configured to be connected with the first tab 221, a first accommodation chamber 2115 is formed between an inner circumferential surface 21131 of the first side wall and an outer circumferential surface 21141 of the third protrusion, and the first accommodation chamber 2115 is configured to accommodate electrolyte, improving a cycle life of the battery cell 20.

The third protrusion 2114 of the inner surface 21121 of the first end wall is for electrically connecting with the first tab 221 to electrically connect the first housing 211 and the first tab 221, and a first receiving chamber 2115 is formed between the inner circumferential surface 21131 of the first side wall and the outer circumferential surface 21141 of the third protrusion, the first receiving chamber 2115 being configured to receive electrolyte so that more electrolyte can be received inside the case 21 to sufficiently infiltrate the electrode assembly 22.

The first end wall 2112 and the first side wall 2113 together define a first accommodation space 2111. The first end wall 2112 has a disk structure, and the first side wall 2113 has a cylindrical structure surrounding the edge of the first end wall 2112. The first receiving chamber 2115 is an annular chamber.

In other embodiments, if the housing 21 has other structures, the first housing 211 may have other structures, for example, the housing 21 has a square structure, the first end wall 2112 has a square disk structure, and the first side wall 2113 has a square cylinder structure surrounding the edge of the first end wall 2112.

The first end wall 2112 is provided at one end of the first side wall 2113 in the axial direction, and the first opening 21111 is provided at the other end of the first side wall 2113 in the axial direction along the first direction a.

In some embodiments, a first recess 2116 is formed in the first end wall 2112 that is recessed inward from the outer surface 21122 of the first end wall, and a third protrusion 2114 is formed in the inner surface 21121 of the first end wall at a location corresponding to the first recess 2116. The first recess 2116 can provide a mounting location for a structure external to the housing 21, such as a bus bar component. And the third protrusion 2114 is formed on the inner surface 21121 of the first end wall, the processing difficulty is low, and the difficulty of forming the first recess 2116 on the outer surface 21122 of the first end wall is lower than that of directly forming the third protrusion 2114 on the inner surface 21121 of the first end wall, so that the forming difficulty of the third protrusion 2114 is reduced because the third protrusion 2114 protruding from the inner surface 21121 of the first end wall is formed at the position of the inner surface 21121 of the first end wall corresponding to the first recess 2116.

In other embodiments, the outer surface 21122 of the first end wall may not be formed with the first recess 2116.

As shown in fig. 7, in some embodiments, the second housing 212 includes a second end wall 2122 and a second side wall 2123, the second side wall 2123 surrounding an edge of the second end wall 2122, the second side wall 2123 being configured to receive a portion of the electrode assembly 22, and it is understood that the second end wall 2122 and the second side wall 2123 together define a second receiving space 2121. The second end wall 2122 is a disk structure, and the second side wall 2123 is a cylindrical structure surrounding the edge of the second end wall 2122. In other embodiments, if the housing 21 is in other forms, the second housing 212 may be in other forms, for example, the housing 21 is in a square structure, the second end wall 2122 is in a square disk structure, and the second side wall 2123 is in a square cylinder structure surrounding the edge of the second end wall 2122.

The second end wall 2122 is disposed at one axial end of the second side wall 2123, and the second opening 21211 is disposed at the other axial end of the second side wall 2123 in the first direction a.

In some embodiments, the inner surface 21121 of the first end wall is formed with a fourth protrusion 2124, the fourth protrusion 2124 is configured to connect with the second tab 222, a second receiving cavity 2125 is formed between the inner peripheral surface 21231 of the second side wall and the outer peripheral surface 21241 of the fourth protrusion, and the second receiving cavity 2125 is configured to receive electrolyte to increase the cycle life of the battery cell 20.

The fourth protrusion 2124 of the inner surface 21221 of the second end wall is configured to electrically connect with the second tab 222 to electrically connect the second case 212 and the second tab 222, and a second receiving chamber 2125 is formed between the inner peripheral surface 21231 of the second side wall and the outer peripheral surface 21241 of the fourth protrusion, and the second receiving chamber 2125 is configured to receive electrolyte so that more electrolyte can be contained inside the case 21 to sufficiently infiltrate the electrode assembly 22. The second receiving cavity 2125 may be an annular cavity.

In some embodiments, a second recess 2126 is formed in the second end wall 2122 that is recessed inwardly from an outer surface 21222 of the second end wall, and a fourth protrusion 2124 is formed in the inner surface 21221 of the second end wall at a position corresponding to the second recess 2126. The second recess 2126 can provide a mounting location for a structure external to the housing 21, such as a bus bar component. And the fourth protrusion 2124 is formed on the inner surface 21221 of the second end wall, which is difficult to process, and the difficulty of forming the second recess 2126 on the outer surface 21222 of the second end wall is lower than that of directly forming the fourth protrusion 2124 on the inner surface 21221 of the second end wall, so that the fourth protrusion 2124 protruding from the inner surface 21221 of the second end wall is formed at the position corresponding to the second recess 2126 on the inner surface 21221 of the second end wall, thereby reducing the difficulty of forming the fourth protrusion 2124.

In other embodiments, the outer surface 21222 of the second end wall may not be formed with the second recess 2126.

In some embodiments, the first case 211 is coaxially arranged with the second case 212 to make the space inside the case 21 more regular, facilitating the installation of the electrode assembly 22. Wherein the first direction a coincides with the axial direction of the housing 21, the first housing 211 and the second housing 212 are arranged at intervals in the axial direction of the housing 21.

In some embodiments, the outer diameter of the first housing 211 is equal to the outer diameter of the second housing 212, and it will be appreciated that the outer peripheral surface 2117 of the first housing and the outer peripheral surface 2127 of the second housing are flush to make the outer shape of the housing 21 more regular, facilitating placement of the battery 100. The outer peripheral surface 2117 of the first housing refers to a surface of the first housing 211 that surrounds the outer periphery of the axis of the first housing 211 and faces away from the axis. The outer peripheral surface 2127 of the second housing refers to a surface of the second housing 212 that surrounds the outer periphery of the axis of the second housing 212 and faces away from the axis.

In some embodiments, the inner diameter of the first case 211 is equal to the inner diameter of the second case 212, and it is understood that the inner circumferential surface of the first case is flush with the inner circumferential surface of the second case 212, so that the space inside the case 21 is more regular, the installation of the electrode assembly 22 is facilitated, and the space of the case 21 can be fully utilized. The inner peripheral surface of the first housing 211 means a surface of the first housing 211 which is surrounded on the outer periphery of the axis of the first housing 211 and is close to the axis, and the inner peripheral surface of the first housing 211 is the inner peripheral surface 21131 of the first side wall. The outer peripheral surface 2127 of the second housing refers to a surface of the second housing 212 surrounding and close to the axis of the second housing 212, and an inner peripheral surface of the second housing 212, i.e., an inner peripheral surface 21231 of the second side wall.

In some embodiments, only the first case 211 may form the first receiving space 2111 having the first opening 21111, the electrode assembly 22 is received in the first receiving space 2111, and the second case 212 is an end cap for closing the first opening 21111 of the first case 211. The end caps are spaced apart from the first housing 211 along the first direction a.

As shown in fig. 8, in some embodiments, insulator 213 includes a connector 2131 and a divider 2132, connector 2131 is configured for a plug-in fit with first housing 211 and second housing 212, divider 2132 is connected to connector 2131, and divider 2132 is configured to divide first housing 211 and second housing 212 in a first direction a to insulate first housing 211 from said second housing 212.

The connector 2131 of the insulator 213 is for mating with the first housing 211 and the second housing 212 in a plugging manner to achieve a state in which the first housing 211 and the second housing 212 are arranged at intervals in the first direction a and to maintain the first housing 211 and the second housing 212 in a relatively fixed position, so that the structure of the housing 21 is stable, the plugging manner is such that the connection manner of the first housing 211 and the second housing 212 with the insulator 213 is simple, and the separator 2132 of the insulator 213 is provided between the first housing 211 and the second housing 212 in the first direction a to insulate the first housing 211 from the second housing 212, so that the insulator 213 not only plays a role in insulating the first housing 211 and the second housing 212, but also plays a role in connecting the first housing 211 and the second housing 212 to maintain the first housing 211 and the second housing 212 at intervals.

The connector 2131 is configured to be inserted into the first housing 211 and the second housing 212, and at least one of the first housing 211 and the second housing 212 may be inserted into the connector 2131, or the connector 2131 may be inserted into the first housing 211 and the second housing 212.

As shown in fig. 8, in some embodiments, the connector 2131 is provided around the outside of the first housing 211 and the second housing 212. In other words, the first housing 211 and the second housing 212 are inserted into the connecting body 2131, so that the connection with the first housing 211 and the second housing 212 is facilitated, and the connecting body 2131 does not occupy the internal space of the first housing 211 and the second housing 212.

The connecting body 2131 has a sleeve structure with both ends opened, and the separator 2132 is connected to the inner surface of the connecting body 2131 and protrudes from the inner surface of the connecting body 2131 in a direction approaching the axis of the connecting body 2131. The axial direction of the connecting body 2131 coincides with the first direction a. Divider 2132 divides the connection into a first cavity 21311 and a second cavity 21312 distributed on both sides of divider 2132 in a first direction a. The first housing 211 is inserted into the first cavity 21311 at one end thereof in the first opening 21111, and the second housing 212 is inserted into the second cavity 21312 at one end thereof in the second opening 21211, such that the first opening 21111 and the second opening 21211 are disposed facing each other. In the first direction a, the separator 2132 is located between the end face of the first housing 211 where the first opening 21111 is provided and the end face of the second housing 212 where the second opening 21211 is provided, so that the first housing 211 and the second housing 212 are arranged at intervals in the first direction a.

In some embodiments, divider 2132 may be an annular structure, and divider 2132 may also include a plurality of dividers arranged along a circumferential spacing portion.

In some embodiments, the connector 2131 is formed with a first protrusion 214 and a second protrusion 215, the first protrusion 214 configured to connect with the outer circumferential surface 2117 of the first housing and the second protrusion 215 configured to connect with the outer circumferential surface 2127 of the second housing. The first convex portion 214 and the second convex portion 215 are provided on the inner surface of the connecting body 2131, the connecting body 2131 is connected to the outer peripheral surface 2117 of the first case by the first convex portion 214, and the connecting body 2131 is connected to the outer peripheral surface 2127 of the second case by the second convex portion 215, so that the structural strength of the connecting body 2131 is prevented from being affected by the direct connection of the connecting body 2131 to the first case 211 and the second case 212.

In some embodiments, the first and second protrusions 214 and 215 may be plastic materials, and the first and second protrusions 214 and 215 are melted by a laser or ultrasonic welding technique, thereby bonding the connection body 2131 to the outer circumferential surface of the first housing 211 and bonding the connection body 2131 to the outer circumferential surface 2127 of the second housing.

In an embodiment, the first protrusions 214 and the second protrusions 215 are each of a ring-shaped structure, and the number of the first protrusions 214 may be one or a plurality of the first protrusions spaced apart in the first direction a, and the number of the second protrusions 215 may be one or a plurality of the second protrusions spaced apart in the first direction a. When the connecting body 2131 is connected to the first housing 211 by the first protruding portion 214 and the connecting body 2131 is connected to the second housing 212 by the second protruding portion 215, the inner surface of the connecting body 2131 and the outer peripheral surface 2117 of the first housing may be bonded to each other, or a gap may be provided, and the inner surface of the connecting body 2131 and the outer peripheral surface 2127 of the second housing may be bonded to each other, or a gap may be provided.

The connection body 2131 is sealingly connected to the outer peripheral surface 2117 of the first housing, the connection body 2131 is sealingly connected to the outer peripheral surface 2127 of the second housing, the connection body 2131 is sealingly connected to the first housing 211 by the first protrusion 214, and the connection body 2131 is sealingly connected to the second housing 212 by the second protrusion 215.

The outer peripheral surface 21313 of the connector may protrude from the outer peripheral surface 2117 of the first housing in the radial direction of the first housing 211, may be flush with the outer peripheral surface 2117 of the first housing, or may protrude from the outer peripheral surface 21313 of the connector in the radial direction of the outer peripheral surface 2117 of the first housing.

In some embodiments, separator 2132 and connector 2131 are integrally formed together, facilitating installation of insulator 213 and enabling improved structural strength of insulator 213. Division body 2132 and connection body 2131 are integrally formed, and it is meant that division body 2132 and connection body 2131 are integrally formed by injection molding or the like. Of course, separator 2132 and connector 2131 may be joined together by welding or the like to form insulator 213.

In some embodiments, the separator 2132 and the connector 2131 may also be separate two structures, the separator 2132 being disposed between the first housing 211 and the second housing 212 along the first direction a such that the first housing 211 and the second housing 212 are spaced apart in the first direction a, and the connector 2131 being disposed around the outside of the first housing 211 and the second housing 212 and connected with the first housing 211 and the second housing 212.

In some embodiments, the insulator 213 actuates to relieve pressure inside the battery cell 20 when the temperature or pressure inside the battery cell 20 exceeds a threshold. The insulating member 213 may be a plastic member, which can ensure the sealing performance of the outer case 21 through the connector 2131 of the insulating member 213, and avoid the first case 211 and the second case 212 from directly contacting, resulting in a short circuit; in addition, when the internal temperature of the battery cell 20 exceeds the threshold value, the plastic member can be quickly melted to perform the pressure relief and exhaust function, and when the internal pressure of the battery cell 20 exceeds the threshold value, the plastic member is expanded in the radial direction, so that the connection relationship between the connector 2131 and the first housing 211 and the second housing 212 is disabled, and the pressure relief and exhaust are realized.

In some embodiments, divider 2132 is sealingly coupled to first housing 211 and second housing 212 such that, in first direction a, there is a sealing connection between first housing 211 and divider 2132, and between second housing 212 and divider 2132, improving the sealing performance of housing 21 and reducing the risk of leakage of housing 21.

In some embodiments, housing 21 further includes a first seal 216 and a second seal 217, first seal 216 being at least partially located between first housing 211 and divider 2132 in first direction a to effect a sealed connection of divider 2132 to first housing 211, and second seal 217 being at least partially located between second housing 212 and divider 2132 to effect a sealed connection of divider 2132 to second housing 212.

The first housing 211 and the separator 2132 are in sealing connection through the first sealing member 216, and the second housing 212 and the separator 2132 are in sealing connection through the second sealing member 217, so that the sealing performance between the separator 2132 and the first housing 211 and the second housing 212 is better.

The first and second seals 216 and 217 may be ring-shaped sealing rings, and the inner diameters of the first and second seals 216 and 217 may be equal to or greater than the inner diameters of the first and second housings 211 and 212. The outer diameter of the first seal 216 and the outer diameter of the second seal 217 may or may not be equal to the outer diameter of the first housing 211 and the outer diameter of the second housing 212. The materials of the first seal 216 and the second seal 217 include nitrile rubber, silicone rubber, natural rubber, and the like.

The first housing 211, the first seal 216, the separator 2132, the second seal 217 and the second housing 212 are coaxially arranged. In the first direction a, the first seal 216 is pressed between the end surface of the first housing 211 provided with the first opening 21111 and the divider 2132, and the second seal 217 is pressed between the end surface of the second housing 212 provided with the first opening and the divider 2132.

As shown in fig. 9, the embodiment of the present application further provides a method for manufacturing a battery cell 20, where the method for manufacturing a battery cell 20 includes:

Step S100, providing an electrode assembly 22, wherein the electrode assembly 22 comprises a first tab 221 and a second tab 222 with opposite polarities;

step S200 of providing a first housing 211, a second housing 212 and an insulator 213;

step S300 of assembling the electrode assembly 22, the first case 211, the second case 212, and the insulator 213 such that the electrode assembly 22 is received in a receiving space defined by the first case 211, the second case 212, and the insulator 213 and the first case 211 and the second case 212 are spaced apart in the first direction a, and at least a portion of the insulator 213 is disposed between the first case 211 and the second case 212 to insulate the first case 211 and the second case 212;

step S400, electrically connecting the first tab 221 with the first housing 211;

in step S500, the second tab 222 is electrically connected to the second housing 212.

The first and second cases 211 and 212 are spaced apart in the first direction a such that the first and second cases 211 and 212 do not have an overlapping portion to increase the energy density of the battery cell 20. With first casing 211 and first tab 221 electrically connected, second casing 212 and second tab 222 electrically connected, then shell 21 may not be provided with an end cap, and shell 21 does not need to reserve space for the end cap, so that the interior space of shell 21 can be fully used to accommodate electrode assembly 22 and electrolyte, thereby improving the energy density of battery 100 and meeting the requirements of high energy density.

In the above-described method for manufacturing the battery cell 20, the order of performing the steps S100 and S200 is not limited, and for example, the step S200 may be performed first and then the step S200 may be performed. The order of executing the steps S400, S500 is not limited, and for example, the step S500 may be executed first and then the step S400 may be executed.

As shown in fig. 10, an embodiment of the present application also provides a manufacturing apparatus 2000 of a battery cell, including a providing device 2100, a first assembling device 2200, and a second assembling device 2300. The providing apparatus 2100 is configured to provide the electrode assembly 22, the first housing 211, the second housing 212, and the insulator 213, and the electrode assembly 22 includes the first tab 221 and the second tab 222 having opposite polarities. The first assembling means 2200 is configured to assemble the electrode assembly 22, the first case 211, the second case 212, and the insulator 213 such that the electrode assembly 22 is received in the first case 211 with the first case 211 and the second case 212 spaced apart in the first direction a, the second case 212, and the insulator 213 define a receiving space, and at least a portion of the insulator 213 is disposed between the first case 211 and the second case 212 to insulate the first case 211 and the second case 212. The second assembly device 2300 is configured to electrically connect the first tab 221 with the first housing 211 and the second tab 222 with the second housing 212.

The first assembling means 2200 disposes the first housing 211 and the second housing 212 at intervals in the first direction a such that the first housing 211 and the second housing 212 do not have an overlapping portion to increase the energy density of the battery cell 20. And the second assembling device 2300 electrically connects the first case 211 with the first tab 221 and the second case 212 with the second tab 222, the case 21 may not be provided with an end cap, and the case 21 does not need to reserve a space for the end cap, so that the inner space of the case 21 can be sufficiently used to accommodate the electrode assembly 22 and the electrolyte, thereby improving the energy density of the battery 100 and satisfying the requirement of high energy density.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

A housing for receiving an electrode assembly, the electrode assembly including first and second tabs of opposite polarity, comprising:

the first shell is used for being electrically connected with the first tab;

The second shell is electrically connected with the second lug, and the second shell and the first shell are arranged at intervals along the first direction; and

an insulator configured to be at least partially disposed between the first housing and the second housing to insulate the first housing and the second housing.
The enclosure of claim 1, wherein the insulator comprises a connector configured to be in plug-fit with the first and second housings and a separator connected to the connector, the separator configured to separate the first and second housings in the first direction to insulate the first and second housings.
The enclosure of claim 2, wherein the separator is sealingly connected to the first and second shells.
A housing according to claim 2 or 3, wherein the housing further comprises a first seal at least partially between the first housing and the partition in the first direction to effect a sealed connection of the partition to the first housing and a second seal at least partially between the second housing and the partition to effect a sealed connection of the partition to the second housing.
The enclosure of any of claims 2-4, wherein the connector encloses an exterior side of the first and second shells.
The housing according to any one of claims 2 to 5, wherein the connecting body is formed with a first protruding portion configured to be connected with an outer peripheral surface of the first casing and a second protruding portion configured to be connected with an outer peripheral surface of the second casing.
The enclosure of any of claims 2-6, wherein the separator and the connector are an integrally formed structure.
The case according to any one of claims 1 to 7, wherein the first case is formed with a first receiving space having a first opening, the first receiving space being configured to receive a portion of the electrode assembly;

the second case is formed with a second receiving space having a second opening configured to receive a portion of the electrode assembly.
The case according to any one of claims 1 to 8, wherein the first case includes a first end wall and a first side wall, the first side wall being surrounded by an edge of the first end wall, the first side wall being configured to accommodate a portion of the electrode assembly, an inner surface of the first end wall being formed with a third protrusion configured to be connected with the first tab, a first accommodation chamber being formed between an inner peripheral surface of the first side wall and an outer peripheral surface of the third protrusion, the first accommodation chamber being configured to accommodate an electrolyte.
The housing according to claim 9, wherein the first end wall has a first concave portion formed thereon that is concave inward from an outer surface of the first end wall, and the third convex portion is formed at a position of an inner surface of the first end wall corresponding to the first concave portion.
The enclosure of any one of claims 1-10, wherein the first housing is coaxially arranged with the second housing.
The enclosure of any one of claims 1-11, wherein an outer diameter of the first housing is equal to an outer diameter of the second housing.
The enclosure of any one of claims 1-12, wherein an inner diameter of the first housing is equal to an inner diameter of the second housing.
A battery cell, comprising:

the housing according to any one of claims 1-13; and

the electrode assembly is accommodated in the shell and comprises a first tab and a second tab, the polarities of the first tab and the second tab are opposite, the first tab is electrically connected with the first shell, and the second tab is electrically connected with the second shell.
A battery comprising the battery cell of claim 14.
A powered device comprising the battery cell of claim 14.
A method of manufacturing a battery cell, comprising:

providing an electrode assembly comprising a first tab and a second tab of opposite polarity;

providing a first housing, a second housing and an insulator;

assembling the electrode assembly, the first case, the second case, and the insulating member such that the electrode assembly is received in a receiving space defined by the first case, the second case, and the insulating member and the first case and the second case are spaced apart in a first direction, and at least a portion of the insulating member is disposed between the first case and the second case to insulate the first case and the second case;

electrically connecting the first tab with the first housing;

and electrically connecting the second lug with the second shell.
A manufacturing apparatus of a battery cell, comprising:

a providing device configured to provide an electrode assembly including first and second tabs of opposite polarities, a first case, a second case, and an insulator;

a first assembling device configured to assemble the electrode assembly, the first case, the second case, and the insulating member such that the electrode assembly is accommodated in an accommodation space defined by the first case, the second case, and the insulating member and the first case and the second case are arranged at intervals in a first direction, and at least a portion of the insulating member is disposed between the first case and the second case to insulate the first case and the second case;

And a second assembly device configured to electrically connect the first tab with the first housing and the second tab with the second housing.