CN117203827A

CN117203827A - Battery monomer, battery, electric equipment and manufacturing equipment and method of battery monomer

Info

Publication number: CN117203827A
Application number: CN202280029735.XA
Authority: CN
Inventors: 陈圣旺; 周文林; 郭志君
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2023-12-08
Also published as: WO2023173249A1

Abstract

The application provides a battery monomer, a battery, electric equipment and manufacturing equipment and method of the battery monomer, and relates to the technical field of batteries. The battery cell comprises a shell, an electrode assembly, an end cover, a terminal assembly and a current collecting member; the electrode assembly is accommodated in the case; the end cover is used for sealing the opening and is provided with an electrode leading-out hole; the electrode terminals of the terminal assemblies are arranged corresponding to the electrode leading-out holes and are used for outputting electric energy of the battery cells; the current collecting member is configured to electrically connect the electrode terminal and the tab; the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting an electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is equal to or greater than 2mm along the radial direction of the electrode leading-out hole, the larger creepage distance between the end cover and the current collecting component is provided, and the risk that the end cover is broken down by high voltage is reduced, so that the risk that a battery monomer causes a safety problem due to high-voltage breakdown short circuit is reduced.

Description

Battery monomer, battery, electric equipment and manufacturing equipment and method of battery monomer

Technical Field

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

Background

With the application of lithium ion batteries to power automobiles, the safety of the batteries is becoming more and more interesting, and how to ensure that the batteries do not have safety accidents in the whole life cycle of the battery cells has become one of the common concerns in the lithium battery industry.

Currently, the end caps of the battery cells have cantilever beams under the sealing member, and because the cantilever beams are relatively close to the current collecting members in the battery cells, the end caps may break down at high voltage, causing short circuits and causing the battery cells to fire.

Disclosure of Invention

The embodiment of the application provides a battery monomer, a battery, electric equipment and manufacturing equipment and method of the battery monomer, so that the risk of high-voltage breakdown of an end cover is reduced, and the safety performance of the battery is improved.

In a first aspect, embodiments of the present application provide a battery cell including a housing, an electrode assembly, an end cap, a terminal assembly, and a current collecting member; the housing has an opening; the electrode assembly is accommodated in the shell and provided with a tab; the end cover is used for sealing the opening and is provided with an electrode leading-out hole; the terminal assembly comprises an electrode terminal, the electrode terminal is arranged corresponding to the electrode leading-out hole, and the electrode terminal is used for outputting the electric energy of the battery cell; the current collecting member is configured to be connected between the electrode terminal and the tab to electrically connect the electrode terminal and the tab; the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting the electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is more than or equal to 2mm along the radial direction of the electrode leading-out hole.

In the technical scheme, the minimum radial distance between the hole wall of the electrode leading-out hole on the end cover and the connecting part of the current collecting member extending into the electrode leading-out hole is not less than 2mm, so that a larger creepage distance is formed between the end cover and the current collecting member, the risk that the end cover is broken down by high voltage is reduced, and the risk that a battery cell causes a safety problem due to high voltage breakdown short circuit is reduced.

In some embodiments of the first aspect, H satisfies: h is more than or equal to 3mm.

In the technical scheme, the minimum distance between the hole wall of the electrode leading-out hole on the end cover and the connecting part of the current collecting member extending into the electrode leading-out hole along the radial direction is not less than 3mm, so that the creepage distance between the end cover and the current collecting member is further increased, the risk of high-voltage breakdown of the end cover is reduced, and the risk of safety problem caused by high-voltage breakdown short circuit of the battery cell is reduced.

In some embodiments of the first aspect, H satisfies: h is less than or equal to 10mm.

In the technical scheme, the radial distance between the hole wall of the electrode leading-out hole on the end cover and the connecting part of the current collecting member extending into the electrode leading-out hole is not more than 10mm, so that the manufacturing difficulty can be reduced, and the structural strength of the end cover is ensured.

In some embodiments of the first aspect, a projection of the electrode terminal onto the end cap is located within the electrode extraction hole along an axial direction of the electrode extraction hole.

In the above technical scheme, the projection of the electrode terminal on the end cover is positioned in the electrode leading-out hole, and then the aperture of the electrode leading-out hole is larger than the outer diameter of the electrode terminal, so that a larger distance is reserved between the hole wall of the radial electrode leading-out hole along the electrode leading-out hole and the electrode terminal, a larger creepage distance is reserved between the end cover and the current collecting member, the risk that the end cover is broken down by high voltage is reduced, and the risk that the safety problem is caused by the high voltage breakdown short circuit of the battery cell is reduced.

In some embodiments of the first aspect, the terminal assembly further includes a fixing member connected to the end cap, the fixing member being coated on an outer side of the electrode terminal in a circumferential direction of the electrode terminal to fix the electrode terminal to the end cap.

In the technical scheme, the fixing piece is arranged, so that the electrode terminal is conveniently fixed on the end cover. The fixing member circumferentially surrounds the outer side of the electrode terminal, and thus stability in mounting the electrode terminal can be improved.

In some embodiments of the first aspect, the securing member is integrally formed with the end cap.

In the technical scheme, the fixing piece and the end cover are integrally formed, so that the manufacturing is convenient; and the structure formed by the fixing piece and the end cover has stronger structural strength.

In some embodiments of the first aspect of the present application, the terminal assembly further includes a first insulating member disposed between the fixing member and the electrode terminal to separate the fixing member and the electrode terminal.

According to the technical scheme, the first insulating piece is arranged between the fixing piece and the electrode terminal, so that the short circuit of the battery cell caused by the contact of the fixing piece and the electrode terminal can be avoided.

In some embodiments of the first aspect of the present application, the first insulating member is an injection molded member injection molded between the fixing member and the electrode terminal.

In the above technical scheme, the first insulating part is an injection molding part, in other words, the first insulating part is molded between the fixing part and the electrode terminal in an injection molding mode, so that the molding and the installation of the first insulating part are facilitated. The connection stability between the fixing member and the first insulating member and between the electrode terminal and the first insulating member can also be improved by molding through injection molding.

In some embodiments of the first aspect of the present application, the inner peripheral surface of the fixing member is provided with a first limiting portion protruding inward, the first insulating member is provided with a first recess portion into which the first limiting portion is inserted, and the first limiting portion is configured to be inserted into the first recess portion to fix the fixing member and the first insulating member.

According to the technical scheme, the first limiting part and the first concave part are in plug-in connection, so that the connection stability of the first insulating part and the fixing part can be improved.

In some embodiments of the first aspect of the present application, the inner peripheral surface of the fixing member is provided with a plurality of first limiting portions arranged at intervals, the first insulating member is provided with a plurality of first concave portions arranged at intervals, and the first limiting portions are arranged in one-to-one correspondence with the first concave portions.

According to the technical scheme, the connection stability of the first insulating piece and the fixing piece can be further improved through the plug-in matching of the plurality of first limiting parts and the plurality of first concave parts. And the first spacing portions and the first concave portions can circumferentially spacing the first insulating part after being matched, so that the first insulating part is prevented from rotating circumferentially relative to the fixing part.

In some embodiments of the first aspect of the present application, the outer circumferential surface of the fixing member is provided with a groove, and the first limiting portion protruding from the inner circumferential surface of the fixing member is formed at a position corresponding to the groove on the inner circumferential surface of the fixing member.

In the technical scheme, the first limiting part is formed on the inner surface of the fixing piece in the process of forming the groove on the outer peripheral surface of the fixing piece, so that the manufacturing difficulty can be reduced, and the manufacturing efficiency can be improved.

In some embodiments of the first aspect of the present application, the electrode terminal includes a body part, the first insulating member includes a first insulating part and a second insulating part connected to each other, the first insulating part is provided around an outer circumference of the body part, the body part has a first surface facing an inside of the battery cell, and the second insulating part is located at one side of the first surface and contacts the first surface to restrict movement of the body part in a direction approaching the inside of the battery cell.

In the above technical scheme, the first insulation part is arranged around the periphery of the main body part, so that the fixing piece and the main body part can be separated, and the internal short circuit of the battery cell caused by the contact of the fixing piece and the main body part is avoided. The second insulating part is contacted with the first surface of the main body part, so that the insulating effect is achieved, the movement of the main body part in the direction close to the inside of the battery cell can be limited, and the mounting stability of the electrode terminal is improved.

In some embodiments of the first aspect of the present application, the electrode terminal further includes a first protrusion protruding from the first surface toward the main body, and the first insulating member is disposed around an outer periphery of the first protrusion.

In the above technical scheme, the electrode terminal further comprises a first protruding portion, and the first protruding portion is closer to the inside of the battery cell relative to the main body portion, so that the electrode terminal is connected with the current collecting member. The second insulating part is arranged on the periphery of the first protruding part in a surrounding mode, so that the contact area between the first insulating part and the electrode terminal can be increased, and the connection stability is improved.

In some embodiments of the first aspect, a distance C between a hole wall of the electrode lead-out hole and an outer peripheral wall of the first protrusion along a radial direction of the electrode lead-out hole satisfies: c is less than or equal to 8mm.

In the above technical scheme, the distance C between the hole wall of the electrode leading-out hole and the peripheral wall of the first protruding part is not more than 8mm, so that the creepage distance between the end cover and the electrode terminal can be increased, the risk that the end cover is broken down by high voltage is reduced, and the risk that the safety problem is caused by the high voltage breakdown short circuit of the battery cell is reduced.

In some embodiments of the first aspect of the present application, a surface of the first protrusion facing the battery cell is further away from an interior of the battery cell than a surface of the second insulation facing the battery cell; wherein, along the axial of electrode extraction hole, the first protrusion face is faced the battery monomer the surface with second insulation portion face the battery monomer the distance D between the surface, satisfy: d is more than 0mm and less than or equal to 3mm.

In the above technical scheme, the first protrusion faces the free surface of battery and faces the free surface of battery relatively to the second insulation and keep away from the free inside of battery more to make the separation mounting that second insulation can be better and first protrusion, further reduce the risk of the free short circuit of battery.

In some embodiments of the first aspect of the present application, the fixing member includes a fixing body surrounding the main body, and one end of the fixing body is connected to a surface of the end cap facing away from the inside of the battery cell; along the radial direction of the electrode lead-out hole, the distance E between the inner surface of the fixing body and the outer peripheral surface of the main body part satisfies the following conditions: e is more than or equal to 0.3mm and less than or equal to 2mm.

In the above technical scheme, the distance E between the inner surface of the fixing body and the outer peripheral surface of the main body part satisfies: e is more than or equal to 0.3mm and less than or equal to 2mm, an insulating part is conveniently arranged between the fixed body and the main body, and the thickness of the insulating part meets the insulation requirement.

In some embodiments of the first aspect of the application, the inner diameter of the stationary body is smaller than the inner diameter of the electrode lead-out hole; along the radial direction of the electrode leading-out hole, the distance F between the inner surface of one end of the fixed body connected with the end cover and the hole wall of the electrode leading-out hole meets the following conditions: f is more than or equal to 0.5 and less than or equal to 4mm.

In the above technical scheme, the distance F between the inner surface of one end of the fixed body connected with the end cover and the hole wall of the electrode leading-out hole meets the following conditions: f is more than or equal to 0.5 and less than or equal to 4mm, and is convenient for fixing the body on the end cover.

In some embodiments of the first aspect of the present application, the terminal assembly further includes a sealing member disposed between the fixing member and the electrode terminal to hermetically connect the electrode terminal and the fixing member.

In the technical scheme, the sealing piece is arranged between the fixing piece and the electrode terminal, so that the sealing performance between the fixing piece and the electrode terminal can be improved, and the sealing performance of the battery cell is improved.

In some embodiments of the first aspect of the present application, the electrode terminal includes a body portion; the fixing member includes a flange configured to extend in a direction close to an axis of the electrode lead-out hole and to be located at a side of the main body portion facing away from the inside of the battery cell to restrict movement of the electrode terminal in a direction facing away from the inside of the battery cell, at least a portion of the sealing member being located between the flange and the main body portion.

In the technical scheme, the flange can limit the movement of the electrode terminal to the direction deviating from the inside of the battery cell, so that the stability of the installation of the electrode terminal is improved.

In some embodiments of the first aspect of the present application, a side of the main body portion facing away from the inside of the battery cell has a second surface, the electrode terminal further includes a boss protruding from the second surface from the main body portion, a portion of the seal is located between the second surface and the flange, and a portion of the seal is located between the flange and an outer peripheral surface of the boss.

In the technical scheme, the part of the sealing member is positioned between the second surface and the boss, the part of the sealing member is positioned between the inner peripheral surface of the flange and the outer peripheral surface of the boss, the contact area of the sealing member and the electrode terminal can be increased, the contact area of the sealing member and the flange can be increased, and the sealing performance between the fixing member and the electrode terminal can be improved.

In some embodiments of the first aspect of the present application, the battery cell further includes a second insulating member including an insulating body portion and an extension portion connected to each other, the insulating body portion being disposed on a side of the end cap facing the inside of the battery cell, the extension portion extending from the insulating body portion to the inside of the electrode lead-out hole in a direction approaching the electrode terminal along an axial direction of the electrode lead-out hole and surrounding an outer side of the connection portion to separate the connection portion and a wall of the electrode lead-out hole.

In the above technical scheme, the insulating body part of the second insulating part is arranged on one side of the end cover facing the battery cell, so that the electrode assembly and the end cover can be separated, and the short circuit of the battery cell caused by the contact of the electrode assembly and the end cover is avoided. The extension part of the second insulating piece extends into the electrode leading-out hole and is positioned at the outer side of the connecting part of the current collecting component, so that the hole walls of the connecting part and the electrode leading-out hole can be separated, and the risk of short circuit of the battery cell caused by contact between the connecting part and the end cover is reduced.

In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in the embodiment of the first aspect.

In the above technical scheme, the first aspect of the embodiment has a larger creepage distance between the end cover and the current collecting member of the battery cell, so that the risk that the end cover is broken down by high voltage is reduced, and the risk that the safety problem is caused by the high voltage breakdown short circuit of the battery cell is reduced, thereby improving the safety performance of the battery.

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

In the above technical scheme, the first aspect of the embodiment has a larger creepage distance between the end cover and the current collecting member of the battery cell, so that the risk that the end cover is broken down by high voltage is reduced, and the risk that the safety problem is caused by the short circuit of the battery cell due to high voltage breakdown is reduced, thereby improving the electricity utilization safety.

In a fourth aspect, an embodiment of the present application provides an apparatus for manufacturing a battery cell, including a providing device and an assembling device; the providing device is configured to provide a case having an opening, an electrode assembly having a tab, an end cap provided with an electrode lead-out hole, a terminal assembly, and a current collecting member; the terminal assembly comprises an electrode terminal, the electrode terminal is arranged corresponding to the electrode leading-out hole, and the electrode terminal is used for outputting the electric energy of the battery cell; the assembly device is configured to accommodate the electrode assembly within the case, connect the current collecting member between the electrode terminal and the tab, and electrically connect the electrode terminal and the tab; the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting the electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is more than or equal to 2mm along the radial direction of the electrode leading-out hole.

In a fifth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, including:

providing a shell, an electrode assembly, an end cover, a terminal assembly and a current collecting member, wherein the shell is provided with an opening, the electrode assembly is provided with a tab, and the end cover is provided with an electrode leading-out hole; the terminal assembly comprises an electrode terminal, the electrode terminal is arranged corresponding to the electrode leading-out hole, and the electrode terminal is used for outputting the electric energy of the battery cell;

Accommodating the electrode assembly within the case;

connecting the current collecting member between the electrode terminal and the tab to electrically connect the electrode terminal and the tab;

the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting the electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is more than or equal to 2mm along the radial direction of the electrode leading-out hole.

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 a schematic structural diagram of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present application;

Fig. 4 is a cross-sectional view of a battery cell provided in some embodiments of the application;

FIG. 5 is an enlarged view of the portion I of FIG. 4;

fig. 6 is an exploded view of a portion of the structure of a battery cell according to some embodiments of the present application;

fig. 7 is a top view of a battery cell according to some embodiments of the present application;

FIG. 8 is a cross-sectional view taken along the direction A-A in FIG. 7;

fig. 9 is a schematic structural view of an apparatus for manufacturing a battery cell according to some embodiments of the present application;

fig. 10 is a flow chart illustrating a method for manufacturing a battery cell according to some embodiments of the present application.

Icon: 1000-vehicle; 100-cell; 10-a box body; 11-installation space; 12-a first part; 13-a second part; 20-battery cells; 21-a housing; 211-opening; 22-electrode assembly; 221-tab; 221 a-positive electrode tab; 221 b-a negative tab; 23-end caps; 231-filling holes; 232-electrode lead-out holes; 2321, the hole wall of the electrode leading-out hole; a 24-terminal assembly; 241-electrode terminals; 2411-a main body; 2411 A-A first surface; 2411 b-a second surface; 2412-a first protrusion; 2413-a boss; 2414-a second recess; 25-a current collecting member; 251-connecting part; 26-a pressure release mechanism; 27-a fixing piece; 271-a first limit portion; 272-grooves; 273-flange; 274-a stationary body; 28-a first insulating member; 281-a first insulating portion; 282-second insulation; 283-first recess; 284-a second limit; 29-a seal; 210-a second insulator; 2101-an insulating body; 2102-extension; 200-a controller; 300-motor; 2000-manufacturing equipment of battery cells; 2100-providing means; 2200-assembling the 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.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The battery cell includes a case, an electrode assembly, an end cap, a terminal assembly, and a current collecting member. The housing has an opening. The electrode assembly is accommodated in the case. The end cap is used for sealing the opening of the shell. The end cover is provided with an electrode leading-out hole, and the terminal assembly comprises an electrode terminal which is used for outputting electric energy of the battery cell. The electrode terminal is disposed in correspondence with the electrode lead-out hole, and the connection portion of the current collecting member extends into the electrode lead-out hole and is connected with the electrode terminal, thereby electrically connecting the electrode terminal with the tab of the electrode assembly through the current collecting member.

The inventors found that the closer distance between the hole wall of the electrode lead-out hole of the end cap and the connection portion of the current collecting member located in the electrode lead-out hole along the radial direction of the electrode lead-out hole, the smaller creepage distance between the end cap and the current collecting member (creepage distance is the shortest path between two conductive parts or between a conductive part and a device protection interface measured along an insulating surface, here, the distance between the hole wall of the electrode lead-out hole of the end cap and the connection portion of the current collecting member in the radial direction), causes the end cap to be easily broken down under high voltage, thereby causing the battery cell to be short-circuited.

Based on the above-mentioned considerations, in order to reduce the risk of the end cap being broken down by high voltage to cause a short circuit of the battery cell, the inventors have conducted intensive studies to design a battery cell which satisfies the following by making the minimum distance H between the wall of the electrode lead-out hole and the outer peripheral wall of the connecting portion in the radial direction of the electrode lead-out hole: h is more than or equal to 2mm, so that a larger creepage distance is formed between the end cover and the current collecting member, the risk of high-voltage breakdown of the end cover is reduced, and the short circuit of the battery cell due to high-voltage breakdown is reduced.

The battery monomer disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system with the electric equipment comprising the battery cell, the battery and the like disclosed by the application can be used, so that the risk of short circuit of the battery cell caused by high-voltage breakdown of the end cover of the battery cell is reduced, and the stability of the battery performance and the safety of the battery are improved.

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 description, the following embodiments take the electric device as the vehicle 1000 as an example.

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 serves to provide an installation space 11 for the battery cells 20. 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 an installation space 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 29 (not shown), and the sealing member 29 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 part 12 may be a hollow structure having one side opened to form a receiving cavity for receiving the battery cell 20, and the second part 13 may be a hollow structure having one side opened to form a receiving cavity for receiving the battery cell 20, and the opening side of the second part 13 is closed to the opening side of the first part 12, thereby forming the case 10 having the installation space 11. Of course, the first portion 12 may be a hollow structure having one side opened to form a receiving chamber for receiving the battery cell 20, the second portion 13 may be a plate-like structure, and the second portion 13 may be covered on the opened side of the first portion 12 to form the case 10 having the installation space 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 where the battery cell 20 has a rectangular parallelepiped shape.

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.

Referring to fig. 3, the battery cell 20 may include a case 21, an electrode assembly 22, an end cap 23, a terminal assembly 24, and a current collecting member 25. The case 21 has an opening 211, the electrode assembly 22 is accommodated in the case 21, and the cap 23 is used to cover the opening 211.

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 have a rectangular parallelepiped structure. Fig. 3 exemplarily shows a case where the case 21 and the electrode assembly 22 are rectangular parallelepiped.

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 positive electrode tab 221a and a negative electrode tab 221b, and may be a positive electrode current collector without a positive electrode active material layer in the positive electrode sheet as the positive electrode tab 221a, or a negative electrode current collector without a negative electrode active material layer in the negative electrode sheet as the negative electrode tab 221b.

The end cap 23 serves to cover the opening 211 of the case 21 to form a closed receiving space (not shown) for receiving the electrode assembly 22. The accommodation space is also used for accommodating an electrolyte, such as an electrolyte solution.

The terminal assembly 24 is a component outputting electric power of the battery cell 20, and the terminal assembly 24 includes an electrode terminal 241.

The electrode terminal 241 is used to be electrically connected with the electrode assembly 22, that is, the electrode terminal 241 is electrically connected with the tab 221 of the electrode assembly 22, and the electrode terminal 241 is connected with the tab 221 through the current collecting member 25 to achieve the electrical connection of the electrode terminal 241 with the tab 221.

The number of the openings 211 of the housing 21 may be one or two. If the opening 211 of the case 21 is one, the end cover 23 may be one, and two electrode terminals 241 may be provided in the end cover 23, the two electrode terminals 241 are respectively used for electrically connecting with the positive electrode tab 221a and the negative electrode tab 221b of the electrode assembly 22, and the two electrode terminals 241 on the end cover 23 are respectively the positive electrode terminal 241 and the negative electrode terminal 241. If there are two openings 211 of the housing 21, for example, two openings 211 are disposed on two opposite sides of the housing 21, there may be two end caps 23, and the two end caps 23 are respectively covered at the two openings 211 of the housing 21. In this case, the two electrode terminals 241 of the terminal assembly 24 may be respectively disposed at the two end caps 23, and the electrode terminal 241 on one end cap 23 may be a positive electrode terminal 241 for electrical connection with the positive tab 221a of the electrode assembly 22; the electrode terminal 241 on the other end cap 23 is a negative electrode terminal 241 for electrical connection with the negative electrode tab of the electrode assembly 22.

In some embodiments, as shown in fig. 3, a liquid injection hole 231 may be further formed on the end cover 23, and electrolyte may be injected into the housing 21 through the liquid injection hole 231.

In some embodiments, as shown in fig. 3, a pressure relief mechanism 26 may also be provided on the end cap 23, the pressure relief mechanism 26 being configured to actuate to relieve the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold. The threshold design varies according to design requirements. The threshold value may depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell 20. The pressure release mechanism 26 may take the form of, for example, an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure release valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure release mechanism 26 performs an action or a weak structure provided in the pressure release mechanism 26 is broken, thereby forming an opening 211 or a passage through which the internal pressure or temperature can be released.

The term "actuated" as used herein refers to the pressure relief mechanism 26 being actuated or activated to a state such that the internal pressure and temperature of the battery cell 20 is relieved. The action by pressure relief mechanism 26 may include, but is not limited to: at least a portion of the pressure relief mechanism 26 breaks, tears, opens, etc.

In some embodiments, as shown in fig. 3, 4, and 5, the battery cell 20 includes a case 21, an electrode assembly 22, an end cap 23, a terminal assembly 24, and a current collecting member 25; the housing 21 has an opening 211; the electrode assembly 22 is accommodated in the case 21, and the electrode assembly 22 has tabs 221; the end cover 23 is used for sealing the opening 211, and the end cover 23 is provided with an electrode lead-out hole 232; the terminal assembly 24 includes an electrode terminal 241, the electrode terminal 241 being disposed corresponding to the electrode lead-out hole 232, the electrode terminal 241 for outputting electric energy of the battery cell 20; the current collecting member 25 is configured to be connected between the electrode terminal 241 and the tab 221 to electrically connect the electrode terminal 241 and the tab 221; the current collecting member 25 has a connection portion 251 located in the electrode lead-out hole 232, the connection portion 251 being for connecting the electrode terminal 241, a minimum distance H between a hole wall 2321 of the electrode lead-out hole and an outer peripheral wall of the connection portion 251 along a radial direction of the electrode lead-out hole 232 being satisfied with H.gtoreq.2mm.

The electrode lead-out holes 232 may be round holes, square holes, rectangular holes, or other shaped holes. In the present embodiment, the electrode lead-out holes 232 are circular holes, and the electrode lead-out holes 232 penetrate the end cover 23 and are located on both sides in the thickness direction. The axial direction of the electrode lead-out hole 232 coincides with the thickness direction of the end cap 23.

The connection portion 251 of the current collecting member 25 extends into the electrode lead-out hole 232 in the axial direction of the electrode lead-out hole 232. The outer circumferential surface of the connecting portion 251 may be a cylindrical surface or a conical surface. The hole wall 2321 of the electrode lead hole 232 of any shape and the outer peripheral member of the connecting portion 251 of any shape are each the smallest distance in the radial direction from the outer peripheral wall of the connecting portion 251.

The minimum distance between the hole wall 2321 of the electrode lead-out hole on the end cover 23 and the connecting part 251 of the current collecting member 25 extending into the electrode lead-out hole 232 along the radial direction is not less than 2mm, so that a larger creepage distance is formed between the end cover 23 and the current collecting member 25, the risk of high-voltage breakdown of the end cover 23 is reduced, and the risk of safety problems caused by high-voltage breakdown short circuit of the battery cell 20 is reduced.

Depending on the actual situation, the minimum distance H between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the connection portion 251 may have a different value range, for example, in some embodiments, H satisfies: h is more than or equal to 3mm.

In other embodiments, the lower limit of the range of H may be other, such as H.gtoreq.2.5 mm, H.gtoreq.3.5 mm, H.gtoreq.4 mm, etc.

The minimum distance between the hole wall 2321 of the electrode lead-out hole on the end cover 23 and the connecting part 251 of the current collecting member 25 extending into the electrode lead-out hole 232 along the radial direction is not less than 3mm, so that the creepage distance between the end cover 23 and the current collecting member 25 is further increased, the risk of high-voltage breakdown of the end cover 23 is reduced, and the risk of safety problems caused by high-voltage breakdown short circuit of the battery cell 20 is reduced.

The greater the distance between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the connecting portion 251, the greater the process difficulty, considering the size that the processing process can do and the structural size of the end cap 23 in practice, in some embodiments, H satisfies: h is less than or equal to 10mm.

Of course, in other embodiments, the upper limit value of H may be other values. For example, H.ltoreq.9 mm, H.ltoreq.9.5 mm, H.ltoreq.11 mm, etc.

The radial distance between the hole wall 2321 of the electrode lead-out hole on the end cover 23 and the connecting part 251 of the current collecting member 25 extending into the electrode lead-out hole 232 is not more than 10mm, so that the manufacturing difficulty can be reduced, and the structural strength of the end cover 23 is ensured.

Referring to fig. 5, in some embodiments, along the axial direction of the electrode lead-out hole 232, the projection of the electrode terminal 241 on the end cover 23 is located in the electrode lead-out hole 232.

The electrode lead-out hole 232 and the electrode terminal 241 are coaxially arranged. The projection of the electrode terminal 241 on the end cap 23 is positioned within the electrode lead-out hole 232, and then the aperture of the electrode lead-out hole 232 is larger than the outer diameter of the projection of the electrode terminal 241 on the end cap 23 in the axial direction thereof. In other embodiments, the aperture of the electrode lead-out hole 232 may be smaller than or equal to the outer diameter of the projection of the electrode terminal 241 on the end cap 23 in the axial direction thereof.

The projection of the electrode terminal 241 on the end cover 23 is located in the electrode lead-out hole 232, and then the aperture of the electrode lead-out hole 232 is larger than the outer diameter of the electrode terminal 241, so that a larger distance is formed between the hole wall 2321 of the radial electrode lead-out hole along the electrode lead-out hole 232 and the electrode terminal 241, a larger creepage distance is formed between the end cover 23 and the current collecting member 25, the risk of high voltage breakdown of the end cover 23 is reduced, and the risk of safety problem caused by high voltage breakdown short circuit of the battery cell 20 is reduced.

The electrode terminal 241 may be directly fixed to the end cap 23, or may be indirectly connected to the end cap 23. Referring to fig. 5 and 6, in some embodiments, the terminal assembly 24 further includes a fixing member 27, the fixing member 27 is connected to the end cover 23, and the fixing member 27 is wrapped around the outside of the electrode terminal 241 along the circumferential direction of the electrode terminal 241 so as to fix the electrode terminal 241 to the end cover 23.

One end of the fixing member 27 is fixed to the end cover 23. The other end of the fixing member 27 is located at a side of the end cap 23 facing away from the inside of the battery cell 20, in other words, the fixing member 27 extends from the end cap 23 to a side of the end cap 23 facing away from the inside of the battery cell 20 and protrudes from a surface of the end cap 23 facing away from the inside of the battery cell 20. The fixing member 27 is a closed structure extending in the circumferential direction of the electrode lead-out hole 232. The end of the fixing member 27 connected to the end cap 23 extends in the extending direction of the hole wall from which the electrode is led out to form the fixing member 27 of the closed structure. It is understood that the electrode terminal 241 is indirectly fixed to the end cap 23 through the fixing member 27.

Along the axial direction of the electrode lead-out hole 232, the electrode terminal 241 may be entirely located in the space surrounded by the fixing member 27 and at one side of the end cap 23 facing away from the inside of the battery cell 20; the electrode terminal 241 may be partially located in the space surrounded by the fixing member 27, and a portion of the electrode terminal 241 may extend into the electrode lead-out hole 232 to be connected to the connection portion 251 of the current collecting member 25.

The fixing member 27 is provided to facilitate fixing of the electrode terminal 241 to the end cap 23. The fixing member 27 is circumferentially coated on the outside of the electrode terminal 241, and thus, the stability of the installation of the electrode terminal 241 can be improved. And the fixing piece 27 extends to one side of the end cover 23, which is far away from the inside of the battery cell 20, and at least part of the fixing piece 27 can be located in the space surrounded by the fixing piece 27, so that occupation of the electrode terminal 241 to the inside space of the battery cell 20 can be reduced, and energy density can be improved.

In some embodiments, the securing member 27 is integrally formed with the end cap 23.

The fixing member 27 and the end cover 23 are integrally formed, that is, the fixing member 27 and the end cover 23 are manufactured by an integral forming process, such as stamping, pouring, and the like.

In other embodiments, the fixing member 27 and the end cover 23 may be separately disposed, and then the fixing member 27 and the end cover 23 may be integrally connected by welding or the like.

The fixing piece 27 and the end cover 23 are integrally formed, so that the manufacturing is convenient; and the structure formed by the fixing piece 27 and the end cover 23 has stronger structural strength.

Referring to fig. 5 and 6, in some embodiments, the terminal assembly 24 further includes a first insulating member 28, and the first insulating member 28 is disposed between the fixing member 27 and the electrode terminal 241 to separate the fixing member 27 and the electrode terminal 241.

The first insulating member 28 is a closed structure extending in the axial direction of the electrode lead-out hole 232. The first insulating member 28 may be pressed between the fixing member 27 and the electrode terminal 241, or the first insulating member 28 may be in a connection relationship with both the fixing member 27 and the electrode terminal 241 such that the electrode terminal 241 is indirectly connected to the fixing member 27 through the first insulating member 28.

The first insulating member 28 separates the fixing member 27 and the electrode terminal 241, meaning that the first insulating member 28 makes the fixing member 27 and the electrode terminal 241 not contact, thereby making the fixing member 27 and the electrode terminal 241 non-conductive. The first insulating member 28 is disposed between the fixing member 27 and the electrode terminal 241, so that it is possible to prevent the battery cell 20 from being shorted by the contact of the fixing member 27 with the electrode terminal 241.

In some embodiments, the first insulating member 28 is an injection molded member injection molded between the fixing member 27 and the electrode terminal 241.

In the injection molding process, the liquid first insulating member 28 has a high temperature, and after contacting the fixing member 27 and the electrode terminal 241, the inner surface of the fixing member 27 and the outer surface of the electrode terminal 241 can be in a molten state, so that the molecules of the fixing member 27 and the liquid first insulating member 28 are mutually penetrated, the molecules of the electrode terminal 241 and the liquid first insulating member 28 are mutually penetrated, and after the first insulating member 28 is solidified into a solid state, the first insulating member 28 and the fixing member 27, the first insulating member 28 and the electrode terminal 241 all form a connection relationship.

In other embodiments, the first insulating member 28 may be formed and then placed between the fixing member 27 and the electrode terminal 241.

The first insulating member 28 is an injection-molded member, in other words, the first insulating member 28 is molded between the fixing member 27 and the electrode terminal 241 by injection molding, facilitating the molding and mounting of the first insulating member 28. The connection stability between the fixing member 27 and the first insulating member 28 and between the electrode terminal 241 and the first insulating member 28 can also be improved by molding through injection molding.

In order to improve the connection stability between the first insulating member 28 and the fixing member 27, referring to fig. 5 and 6, in some embodiments, the inner circumferential surface of the fixing member 27 is provided with a first limiting portion 271 protruding inwards, the first insulating member 28 is provided with a first recess 283 into which the first limiting portion 271 is inserted, and the first limiting portion 271 is configured to be inserted into the first recess 283 to fix the fixing member 27 and the first insulating member 28.

The first limiting portion 271 may be a closed structure formed to extend along the circumferential direction of the electrode lead-out hole 232, and correspondingly, the first recess 283 may be a closed structure formed to extend along the circumferential direction of the electrode lead-out hole 232 in cooperation with the first limiting portion 271; the first limiting portion 271 may have a non-closed structure along the circumferential direction of the electrode lead-out hole 232, and in this embodiment, the first recess 283 may have a non-closed structure matching with the first limiting portion 271 or a closed structure extending along the circumferential direction of the electrode lead-out hole 232.

In other embodiments, the first recess 283 may be formed on the inner surface of the fixing member 27, and the first stopper 271 capable of being inserted into the first recess 283 of the inner surface of the fixing member 27 may be formed on the surface of the first insulating member 28 facing the inner surface of the fixing member 27.

The plug-in engagement of the first limiting portion 271 and the first recess portion 283 can improve the connection stability of the first insulating member 28 and the fixing member 27.

The number of the first limiting portions 271 may be one or more, and the number of the first limiting portions may be two or more. As shown in fig. 6, in some embodiments, the inner peripheral surface of the fixing member 27 is provided with a plurality of first limiting portions 271 arranged at intervals, and the first insulating member 28 is provided with a plurality of first recess portions 283 arranged at intervals, and the first limiting portions 271 are disposed in one-to-one correspondence with the first recess portions 283.

The plurality of first limiting portions 271 may be disposed in a common circle or may be distributed on different circumferences. The plurality of first stopper portions 271 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232.

In other embodiments, the plurality of first limiting portions 271 may also be arranged at intervals along the axial direction of the electrode lead-out hole 232.

The plug-in fitting of the plurality of first limiting portions 271 and the plurality of first recessed portions 283 can further improve the connection stability of the first insulating member 28 and the fixing member 27. And the plurality of first limiting portions 271 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232, the plurality of first limiting portions 271 and the plurality of first concave portions 283 can also limit the first insulating member 28 in the circumferential direction after being matched, so that the first insulating member 28 is prevented from rotating relative to the fixing member 27 in the circumferential direction.

As shown in fig. 6, in some embodiments, the outer circumferential surface of the fixing member 27 is provided with a groove 272, and a first stopper 271 protruding from the inner circumferential surface of the fixing member 27 is formed at a position of the inner circumferential surface of the fixing member 27 corresponding to the groove 272.

The groove 272 is recessed from the outer circumferential surface of the fixing member 27 into the enclosed inner space of the fixing member 27, and then the inner surface of the fixing member 27 protrudes into the enclosed inner space of the fixing member 27 at a corresponding position of the groove 272 to form the first stopper 271.

In other embodiments, the first limiting portion 271 may also be disposed directly on the inner surface of the fixing member 27.

Forming the first limit portion 271 on the inner surface of the fixing member 27 in the process of forming the groove 272 on the outer peripheral surface of the fixing member 27 can reduce the manufacturing difficulty and improve the manufacturing efficiency.

To improve the connection stability between the first insulating member 28 and the electrode terminal 241, please continue to refer to fig. 6, in some embodiments, along the radial direction of the electrode lead-out hole 232, a second limiting portion 284 is disposed on the surface of the first insulating member 28 facing the electrode terminal 241, a second recess portion 2414 into which the second limiting portion 284 is inserted is disposed on the surface of the electrode terminal 241 facing the first insulating member 28, and the second limiting portion 284 is configured to be inserted into the second recess portion 2414 to fix the first insulating member 28 and the electrode terminal 241.

The second limiting portion 284 may be a closed structure formed by extending along the circumferential direction of the electrode lead-out hole 232, and correspondingly, the second recess portion 2414 may also be a closed structure formed by extending along the circumferential direction of the electrode lead-out hole 232 and matching with the second limiting portion 284; the second limiting portion 284 may also form a non-closed structure along the circumferential direction of the electrode lead-out hole 232, and in this embodiment, the second recess portion 2414 may be a non-closed structure matching with the second limiting portion 284, or may be a closed structure extending along the circumferential direction of the electrode lead-out hole 232.

In other embodiments, the surface of the first insulating member 28 facing the electrode terminal 241 may be provided with a second recess 2414, and the surface of the electrode terminal 241 facing the first insulating member 28 may be formed with a second stopper 284 into which the second recess 2414 of the first insulating member 28 can be inserted.

The second stopper 284 and the second recess 2414 are plug-fitted to improve the connection stability of the first insulating member 28 and the electrode terminal 241.

The number of the second limiting portions 284 may be one or more, wherein the number is two or more. In some embodiments, the first insulating member 28 is provided with a plurality of second limiting portions 284 arranged at intervals, the electrode terminal 241 is provided with a plurality of second recess portions 2414 arranged at intervals, and the second limiting portions 284 are arranged in one-to-one correspondence with the second recess portions 2414.

The second limiting portions 284 may be disposed in a common circle or may be distributed on different circumferences. The plurality of second stopper portions 284 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232.

In other embodiments, the plurality of second stopper portions 284 may also be arranged at intervals along the axial direction of the electrode lead-out hole 232.

The plug-in fitting of the plurality of second stopper portions 284 and the plurality of second recess portions 2414 can further improve the connection stability of the first insulating member 28 and the electrode terminal 241. And the plurality of second limiting portions 284 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232, the plurality of second limiting portions 284 and the plurality of second recessed portions 2414 can also limit the first insulating member 28 in the circumferential direction after being matched, so that the electrode terminal 241 is prevented from rotating relative to the first insulating member 28 in the circumferential direction.

Referring to fig. 5 and 6 in combination, in some embodiments, the electrode terminal 241 includes a main body portion 2411, the first insulating member 28 includes a first insulating portion 281 and a second insulating portion 282 connected to each other, the first insulating portion 281 is disposed around the outer periphery of the main body portion 2411, the main body portion 2411 has a first surface 2411a facing the inside of the battery cell 20, and the second insulating portion 282 is located at one side of the first surface 2411a and contacts the first surface 2411a to limit movement of the main body portion 2411 in a direction approaching the inside of the battery cell 20.

The first insulating portion 281 and the second insulating portion 282 are each a closed structure extending in the circumferential direction of the electrode lead-out hole 232. The first insulating portion 281 is provided around the outer periphery of the main body portion 2411 so as to separate the main body portion 2411 and the fixing member 27. The second insulating portion 282 is connected to one end of the first insulating portion 281 in the axial direction of the electrode lead-out hole 232. The second insulating part 282 has a circular ring structure such that the second insulating part 282 is formed with a central hole, and the connection part 251 of the current collecting member 25 can be inserted into the central hole to be connected with the electrode terminal 241 or the electrode terminal 241 is penetrated out of the central hole to be connected with the connection part 251 of the current collecting member 25.

The second concave portion 2414 is provided to extend through both ends of the main body portion 2411 in the axial direction of the electrode lead-out hole 232, with the outer peripheral surface of the main body portion 2411.

In other embodiments, the first insulating member 28 may include only the first insulating portion 281.

The first insulating portion 281 is provided around the outer periphery of the main body portion 2411, so that the fixing member 27 and the main body portion 2411 can be separated from each other, and internal short-circuiting of the battery cell 20 due to contact between the fixing member 27 and the main body portion 2411 can be avoided. The second insulating portion 282 contacts the first surface 2411a of the main body portion 2411, thereby not only performing an insulating function, but also restricting movement of the main body portion 2411 in a direction toward the inside of the battery cell 20 and improving mounting stability of the electrode terminal 241.

With continued reference to fig. 5 and 6, in some embodiments, the electrode terminal 241 further includes a first protruding portion 2412, the first protruding portion 2412 protrudes from the first surface 2411a by the main body portion 2411, and the first insulating member 28 is disposed around the outer periphery of the first protruding portion 2412.

The body portion 2411 and the first projection 2412 are both cylindrical, with the diameter of the body portion 2411 being greater than the diameter of the first projection. The surface of the second insulating portion 282 facing away from the inside of the battery cell 20 is connected with the first surface 2411a of the main body portion 2411. The inner surface of the second insulating portion 282 is in contact with the outer circumferential surface of the first protruding portion 2412 in the radial direction of the electrode lead-out hole 232. The surface of the second insulating part 282 facing the inside of the battery cell 20 and the surface of the first protruding part 2412 facing the inside of the battery cell 20 may or may not be flush. In some embodiments, the surface of the second insulating part 282 facing the inside of the battery cell 20 is closer to the inside of the battery cell 20 than the surface of the first protruding part 2412 facing the inside of the battery cell 20 or the surface of the second insulating part 282 facing the inside of the battery cell 20 is farther from the inside of the battery cell 20 than the surface of the first protruding part 2412 facing the inside of the battery cell 20 so as not to be flush with each other.

The electrode terminal 241 includes a first protrusion 2412, and the first protrusion 2412 is closer to the inside of the battery cell 20 than the main body 2411, facilitating connection of the electrode terminal 241 with the current collecting member 25. The second insulating part 282 is surrounded on the outer circumference of the first protrusion 2412, which can increase the contact area of the first insulating member 28 and the electrode terminal 241, improving connection stability.

As shown in fig. 5, 7, 8, in some embodiments, the distance C between the hole wall 2321 of the electrode extraction hole and the outer peripheral wall of the first protrusion 2412 along the radial direction of the electrode extraction hole 232 satisfies: c is less than or equal to 8mm.

It should be noted that, in some embodiments, the connection position between the fixing member 27 and the end cap 23 has a corner region, and the distance C between the hole wall 2321 of the electrode extraction hole and the outer peripheral wall of the first protrusion 2412 should be subtracted by the dimension of the corner region along the radial direction of the electrode assembly 22 (as in F in fig. 8), but the dimension of the corner region along the radial direction of the electrode extraction hole 232 is small, and thus, may be negligible in some cases. C shown in fig. 6 is a case where the dimension of the corner region in the radial direction of the electrode assembly 22 is not ignored. C shown in fig. 8 is a case in which the dimension of the corner region in the radial direction of the electrode assembly 22 is ignored.

Of course, in other embodiments, the upper limit value of C may be other values. For example, C.ltoreq.7.5 mm, C.ltoreq.8.5 mm, C.ltoreq.9 mm, etc.

The distance C between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the first protruding portion 2412 is not more than 8mm, so that the creepage distance between the end cover 23 and the electrode terminal 241 can be increased, the risk of high-voltage breakdown of the end cover 23 is reduced, and the risk of safety problems caused by high-voltage breakdown short circuit of the battery cell 20 is reduced.

As shown in fig. 5, in some embodiments, the surface of the first protrusion 2412 facing the battery cell 20 is farther from the interior of the battery cell 20 than the surface of the second insulation 282 facing the battery cell 20; wherein, along the axial direction of the electrode lead-out hole 232, a distance D between the surface of the first protruding portion 2412 facing the battery cell 20 and the surface of the second insulating portion 282 facing the battery cell 20 satisfies: d is more than 0mm and less than or equal to 3mm.

Of course, other value ranges of D are also possible according to actual needs.

The surface of the first protruding portion 2412 facing the battery cell 20 is farther away from the inside of the battery cell 20 than the surface of the second insulating portion 282 facing the battery cell 20, so that the second insulating portion 282 can better separate the fixing member 27 and the first protruding portion 2412, and the risk of short-circuiting of the battery cell 20 is further reduced.

In other embodiments, the electrode terminal 241 may include only the main body portion 2411, excluding the first protruding portion 2412.

As shown in fig. 8, in some embodiments, the fixing member 27 includes a fixing body 274 surrounding the main body portion 2411, one end of the fixing body 274 is connected with a surface of the end cap 23 facing away from the inside of the battery cell 20; along the radial direction of the electrode lead-out hole 232, the distance E between the inner surface of the fixing body 274 and the outer peripheral surface of the main body portion 2411 satisfies: e is more than or equal to 0.3mm and less than or equal to 2mm.

The first limiting portion 271 is disposed on an inner surface of the fixing body 274, and the groove 272 is disposed on an outer circumferential surface of the fixing body 274. The fixing body 274 has a conical shape, the outer circumferential surface of the fixing body 274 is a circumferential surface, the large end of the fixing body 274 is connected with the end cover 23, and the small end of the fixing body 274 extends to one side of the end cover 23 facing away from the inside of the battery cell 20.

Of course, in other embodiments, the distance E between the inner surface of the fixing body 274 and the outer peripheral surface of the main body 2411 may be other values.

The distance E between the inner surface of the fixing body 274 and the outer peripheral surface of the main body portion 2411 satisfies: e is more than or equal to 0.3mm and less than or equal to 2mm, so that an insulating piece is arranged between the fixed body 274 and the main body 2411, and the thickness of the insulating piece meets the insulation requirement.

As shown in fig. 8, in some embodiments, the inner diameter of the stationary body 274 is smaller than the inner diameter of the electrode lead-out hole 232; along the radial direction of the electrode lead-out hole 232, the distance F between the inner surface of the end of the fixed body 274 connected to the end cover 23 and the hole wall 2321 of the electrode lead-out hole satisfies: f is more than or equal to 0.5 and less than or equal to 4mm.

Since the fixing body 274 extends from the connection position with the end cap 23 to the side of the end cap 23 facing away from the inside of the battery cell 20, a chamfer region exists at the connection position of the fixing body 274 and the end cap 23, so that stress concentration at the connection position of the fixing body 274 and the end cap 23 is reduced. The chamfer area exists to enable one end of the fixing body 274 closest to the inside of the battery cell 20 to be located at a distance between the radial direction of the electrode leading-out hole 232 and the hole wall 2321 of the electrode leading-out hole, namely, the distance F between the inner surface of one end of the fixing body 274 connected with the end cover 23 and the hole wall 2321 of the electrode leading-out hole is too small, if F is too small, the fixing piece 27 and the end cover 23 are inconvenient to integrally form, and if F is too large, the distance between the fixing piece 27 and the current collecting member 25 is reduced, so that the creepage distance is reduced.

The distance F between the inner surface of the end of the fixing body 274 connected to the end cap 23 and the hole wall 2321 of the electrode lead-out hole satisfies: f is more than or equal to 0.5 and less than or equal to 4mm, and the fixing body 274 is conveniently fixed and molded on the end cover 23. And the creepage distance between the connection part 251 of the current collecting member 25 and the fixture 27 is made larger, reducing the risk of the fixture 27 being broken down to cause the battery cell 20 to be short-circuited.

As shown in fig. 8, in some embodiments, the terminal assembly 24 further includes a sealing member 29, and the sealing member 29 is disposed between the fixing member 27 and the electrode terminal 241 to hermetically connect the electrode terminal 241 and the fixing member 27.

The sealing member 29 and the first insulating member 28 are independent structures from each other. In other embodiments, the sealing member 29 may be the first insulating member 28, that is, the first insulating member 28 functions as both an insulator and a seal, and in such embodiments, it may not be necessary to additionally provide the sealing member 29 between the fixing member 27 and the electrode terminal 241.

The sealing member 29 is provided between the fixing member 27 and the electrode terminal 241, so that the sealing performance between the fixing member 27 and the electrode terminal 241 can be improved, thereby improving the sealing performance of the battery cell 20.

With continued reference to fig. 8, in some embodiments, the electrode terminal 241 includes a body portion 2411; the fixing member 27 includes a flange 273, the flange 273 being configured to extend in a direction close to the axis of the electrode lead-out hole 232 and being located on a side of the main body portion 2411 facing away from the inside of the battery cell 20 to restrict movement of the electrode terminal 241 in a direction facing away from the inside of the battery cell 20, at least a portion of the sealing member 29 being located between the flange 273 and the main body portion 2411.

A flange 273 is attached to the end of the stationary body 274 facing away from the end cap 23. The flange 273 has a circular ring structure such that the flange 273 is formed with a central hole, and the electric device can be connected with the electrode terminal 241 through the central hole of the flange 273, or other portions of the electrode terminal 241 can be connected with the electric device through the central hole of the flange 273.

The flange 273 is positioned at a side of the main body portion 2411 facing away from the inside of the battery cell 20, and the flange 273 can restrict the movement of the electrode terminal 241 in a direction facing away from the inside of the battery cell 20, thereby improving the stability of the installation of the electrode terminal 241. The second insulating part 282 is located at a side of the main body part 2411 facing the inside of the battery cell 20, and the flange 273 and the second insulating part 282 together realize the restriction of the electrode terminal 241 in the axial direction of the electrode lead-out hole 232, further improving the mounting stability of the electrode terminal 241.

In some embodiments, the side of the body portion 2411 facing away from the interior of the battery cell 20 has a second surface 2411b, the electrode terminal 241 further includes a boss 2413, the boss 2413 protrudes from the second surface 2411b out of the body portion 2411, a portion of the seal 29 is located between the second surface 2411b and the flange 273, and a portion of the seal 29 is located between the flange 273 and the outer circumferential surface of the boss 2413.

The surface of the flange 273 facing away from the interior of the cell 20 and the surface of the boss 2413 facing away from the interior of the cell 20 may or may not be flush. In some embodiments, the surface of the flange 273 facing away from the interior of the cell 20 is closer to the interior of the cell 20 than the surface of the boss 2413 facing away from the interior of the cell 20 or the surface of the flange 273 facing away from the interior of the cell 20 than the surface of the boss 2413 facing away from the interior of the cell 20 is further from the interior of the cell 20 so that the two are not flat. As shown in fig. 8, the surface of the flange 273 facing away from the interior of the battery cell 20 is closer to the interior of the battery cell 20 than the surface of the boss 2413 facing away from the interior of the battery cell 20, i.e., along the direction facing away from the interior of the battery cell 20, the boss 2413 protrudes from the surface of the flange 273 facing away from the interior of the battery cell 20, so that the electrode terminal 241 is conveniently connected with the electrical equipment to output the electrical energy of the battery cell 20.

The main body portion 2411 and the boss 2413 are both cylindrical, and if the diameter of the main body portion 2411 is larger than that of the boss 2413, the inner peripheral surface of the flange 273 is opposed to the outer peripheral surface of the boss 2413.

The portion of the sealing member 29 between the second surface 2411b and the boss 2413 and the portion of the sealing member 29 between the flange 273 and the outer circumferential surface of the boss 2413 can increase the contact area of the sealing member 29 and the electrode terminal 241 and the contact area of the sealing member 29 and the flange 273, improving the sealing performance between the fixing member 27 and the electrode terminal 241.

With continued reference to fig. 8, in some embodiments, the battery cell 20 further includes a second insulating member 210, where the second insulating member 210 includes an insulating body 2101 and an extension portion 2102, the insulating body 2101 is disposed on a side of the end cover 23 facing the interior of the battery cell 20, and the extension portion 2102 extends from the insulating body 2101 toward a direction close to the electrode terminal 241 along the axial direction of the electrode lead-out hole 232 into the electrode lead-out hole 232 and is enclosed on the outer side of the connecting portion 251 so as to separate the connecting portion 251 from the hole wall 2321 of the electrode lead-out hole.

The extension portion 2102 may extend to abut against one end of the electrode terminal 241 facing the inside of the battery cell 20 or one end of the second insulating portion 282 facing the inside of the battery cell 20, or may have a certain gap with the electrode terminal 241 in the axial direction of the electrode lead hole 232.

The insulating body 2101 of the second insulating member 210 is disposed at a side of the end cap 23 facing the inside of the battery cell 20, and can separate the electrode assembly 22 and the end cap 23, thereby preventing the electrode assembly 22 from contacting the end cap 23 to cause a short circuit of the battery cell 20. The extension part 2102 of the second insulator 210 extends into the electrode lead-out hole 232 and is located outside the connection part 251 of the current collecting member 25, so that the connection part 251 and the hole wall 2321 of the electrode lead-out hole can be separated, and the risk of short circuit of the battery cell 20 caused by contact between the connection part 251 and the end cover 23 is reduced.

The embodiment of the application also provides a battery 100, and the battery 100 includes the battery cell 20 provided in any of the above embodiments.

The foregoing embodiment has a larger creepage distance between the end cover 23 and the current collecting member 25 of the battery cell 20, so as to reduce the risk of high voltage breakdown of the end cover 23, thereby reducing the risk of safety problems caused by high voltage breakdown and short circuit of the battery cell 20, and improving the safety performance of the battery 100.

In an embodiment of the present application, an electric device is provided, where the electric device includes the battery monomer 20 provided in any of the foregoing embodiments.

The foregoing embodiment has a larger creepage distance between the end cover 23 and the current collecting member 25 of the battery cell 20, so as to reduce the risk of high voltage breakdown of the end cover 23, thereby reducing the risk of safety problem caused by high voltage breakdown short circuit of the battery cell 20, and improving the electricity use safety.

As shown in fig. 9, the embodiment of the present application further provides a manufacturing apparatus 2000 of a battery cell, the manufacturing apparatus 2000 of a battery cell including a providing device 2100 and an assembling device 2200; the providing device 2100 is configured to provide a case 21, an electrode assembly 22, an end cap 23, a terminal assembly 24, and a current collecting member 25, the case 21 having an opening 211, the electrode assembly 22 having a tab 221, the end cap 23 being provided with an electrode lead-out hole 232; the terminal assembly 24 includes an electrode terminal 241, the electrode terminal 241 being disposed corresponding to the electrode lead-out hole 232, the electrode terminal 241 for outputting electric energy of the battery cell 20; the assembling device 2200 is configured to accommodate the electrode assembly 22 inside the case 21, connect the current collecting member 25 between the electrode terminal 241 and the tab 221, and electrically connect the electrode terminal 241 and the tab 221; the current collecting member 25 has a connection portion 251 located in the electrode lead-out hole 232, the connection portion 251 being for connecting the electrode terminal 241, a minimum distance H between a hole wall 2321 of the electrode lead-out hole and an outer peripheral wall of the connection portion 251 along a radial direction of the electrode lead-out hole 232 being satisfied with H.gtoreq.2mm.

As shown in fig. 10, an 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:

S100, providing a case 21, an electrode assembly 22, an end cap 23, a terminal assembly 24, and a current collecting member 25, the case 21 having an opening 211, the electrode assembly 22 having a tab 221, the end cap 23 being provided with an electrode lead-out hole 232; the terminal assembly 24 includes an electrode terminal 241, the electrode terminal 241 being disposed corresponding to the electrode lead-out hole 232, the electrode terminal 241 for outputting electric energy of the battery cell 20;

s200 of accommodating the electrode assembly 22 in the case 21;

s300, connecting the current collecting member 25 between the electrode terminal 241 and the tab 221 to electrically connect the electrode terminal 241 and the tab 221;

the current collecting member 25 has a connection portion 251 located in the electrode lead-out hole 232, the connection portion 251 being for connecting the electrode terminal 241, a minimum distance H between a hole wall 2321 of the electrode lead-out hole and an outer peripheral wall of the connection portion 251 along a radial direction of the electrode lead-out hole 232 being satisfied with H.gtoreq.2mm.

The embodiment of the present application provides a battery cell 20, and the battery cell 20 includes a case 21, an electrode assembly 22, an end cap 23, a terminal assembly 24, a current collecting member 25, a fixing member 27, a first insulating member 28, a sealing member 29, and a second insulating member 210.

The housing 21 has an opening 211. The electrode assembly 22 is accommodated in the case 21. The end cap 23 is used to cover the opening 211, and the end cap 23 is provided with an electrode lead-out hole 232. The terminal assembly 24 includes an electrode terminal 241, the electrode terminal 241 being disposed corresponding to the electrode lead-out hole 232, the electrode terminal 241 being for outputting electric energy of the battery cell 20.

The current collecting member 25 is for electrically connecting the electrode terminal 241 and the tab 221 of the electrode assembly 22, and the current collecting member 25 has a connection part 251 located in the electrode lead-out hole 232, the connection part 251 being for connecting the electrode terminal 241.

The fixing member 27 is connected to the end cap 23 and surrounds the outer circumference of the electrode terminal 241, and the fixing member 27 includes a fixing body 274 and a flange 273, one end of the fixing body 274 is connected to the end cap 23, and the other end is connected to the flange 273.

The electrode terminal 241 includes a main body portion 2411, a first protrusion 2412 and a boss 2413. The main body portion 2411 has a first surface 2411a and a second surface 2411b opposite in the axial direction of the electrode lead-out hole 232, the first surface 2411a being closer to the inside of the battery cell 20 than the second surface 2411b. The first protrusion 2412 is coupled to the first surface 2411a and the boss 2413 is coupled to the second surface 2411b. The first insulating portion 281 of the first insulating member 28 is disposed around the outer periphery of the main body portion 2411 to separate the main body portion 2411 and the fixing member 27. The second insulating part 282 of the first insulating member 28 is positioned at a side of the main body part 2411 facing the inside of the battery cell 20 and is connected to the first surface 2411a to restrict the movement of the electrode terminal 241 in a direction approaching the inside of the battery cell 20, and the second insulating part 282 is further provided around the outer circumference of the first protrusion 2412 and is connected to the outer circumference of the first protrusion 2412.

A portion of the seal 29 is sealingly connected between the flange 273 and the second surface 2411b, and a portion of the seal 29 is sealed between the inner peripheral surface of the flange 273 and the outer peripheral surface of the boss 2413.

The insulating body 2101 of the second insulating member 210 is disposed on the side of the end cap 23 facing the inside of the battery cell 20, and the extension 2102 of the second insulating member 210 extends from the insulating body 2101 toward the electrode terminal 241 into the electrode lead-out hole 232 and surrounds the outside of the connection portion 251 along the axial direction of the electrode lead-out hole 232 to separate the connection portion 251 from the hole wall 2321 of the electrode lead-out hole.

Along the radial direction of the electrode lead-out hole 232, the minimum distance H between the hole wall 2321 of the electrode lead-out hole and the peripheral wall of the connecting part 251 meets the requirement that H is more than or equal to 2mm, so that a larger creepage distance exists between the end cover 23 and the current collecting member 25, the risk of high-voltage breakdown of the end cover 23 is reduced, and the risk of safety problems caused by high-voltage breakdown short circuit of the battery cell 20 is reduced.

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 battery cell comprising:

a housing having an opening;

an electrode assembly accommodated in the case, the electrode assembly having a tab;

the end cover is used for sealing the opening and is provided with an electrode leading-out hole;

the terminal assembly comprises an electrode terminal, the electrode terminal is arranged corresponding to the electrode leading-out hole, and the electrode terminal is used for outputting the electric energy of the battery cell;

a current collecting member configured to be connected between the electrode terminal and the tab to electrically connect the electrode terminal and the tab;

the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting the electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is more than or equal to 2mm along the radial direction of the electrode leading-out hole.
The battery cell of claim 1, wherein H satisfies: h is more than or equal to 3mm.
The battery cell according to claim 1 or 2, wherein H satisfies: h is less than or equal to 10mm.
A battery cell according to any one of claims 1 to 3, wherein a projection of the electrode terminal onto the end cap is located within the electrode lead-out hole in an axial direction of the electrode lead-out hole.
The battery cell according to any one of claims 1 to 4, wherein the terminal assembly further comprises a fixing member coupled to the end cap, the fixing member being coated on an outer side of the electrode terminal in a circumferential direction of the electrode terminal to fix the electrode terminal to the end cap.
The battery cell of claim 5, wherein the securing member is integrally formed with the end cap.
The battery cell according to claim 5 or 6, wherein the terminal assembly further comprises a first insulating member disposed between the fixing member and the electrode terminal to separate the fixing member and the electrode terminal.
The battery cell according to claim 7, wherein the first insulating member is an injection molded member injected between the fixing member and the electrode terminal.
The battery cell according to claim 7 or 8, wherein an inner peripheral surface of the fixing member is provided with a first stopper portion protruding inward, the first insulating member is provided with a first recess portion into which the first stopper portion is inserted, and the first stopper portion is configured to be inserted into the first recess portion to fix the fixing member and the first insulating member.
The battery cell according to claim 9, wherein the fixing member is provided with a plurality of the first stopper portions arranged at intervals on an inner peripheral surface thereof, the first insulating member is provided with a plurality of the first recess portions arranged at intervals, and the first stopper portions are provided in one-to-one correspondence with the first recess portions.
The battery cell according to claim 9 or 10, wherein an outer circumferential surface of the fixing member is provided with a groove, and the first stopper portion protruding from the inner circumferential surface of the fixing member is formed at a position of the inner circumferential surface of the fixing member corresponding to the groove.
The battery cell according to any one of claims 7 to 11, wherein the electrode terminal includes a main body portion, the first insulating member includes a first insulating portion and a second insulating portion connected to each other, the first insulating portion is provided around an outer periphery of the main body portion, the main body portion has a first surface facing an inside of the battery cell, and the second insulating portion is located at one side of the first surface and contacts the first surface to restrict movement of the main body portion in a direction approaching the inside of the battery cell.
The battery cell according to claim 12, wherein the electrode terminal further comprises a first protruding portion protruding from the first surface toward the main body portion, and the second insulating portion is provided around an outer periphery of the first protruding portion.
The battery cell according to claim 13, wherein a distance C between a hole wall of the electrode lead-out hole and an outer peripheral wall of the first projection in a radial direction of the electrode lead-out hole satisfies: c is less than or equal to 8mm.
The battery cell of claim 13 or 14, wherein a surface of the first protrusion facing the battery cell is further from an interior of the battery cell than a surface of the second insulation facing the battery cell;

wherein, along the axial of electrode extraction hole, the first protrusion face is faced the battery monomer the surface with second insulation portion face the battery monomer the distance D between the surface, satisfy: d is more than 0mm and less than or equal to 3mm.
The battery cell of any one of claims 12-15, wherein the securing member comprises a securing body surrounding the main body portion, one end of the securing body being connected to a surface of the end cap facing away from an interior of the battery cell;

along the radial direction of the electrode lead-out hole, the distance E between the inner surface of the fixing body and the outer peripheral surface of the main body part satisfies the following conditions: e is more than or equal to 0.3mm and less than or equal to 2mm.
The battery cell according to claim 16, wherein an inner diameter of the stationary body is smaller than an inner diameter of the electrode lead-out hole;

Along the radial direction of the electrode leading-out hole, the distance F between the inner surface of one end of the fixed body connected with the end cover and the hole wall of the electrode leading-out hole meets the following conditions: f is more than or equal to 0.5 and less than or equal to 4mm.
The battery cell of any one of claims 5-17, wherein the terminal assembly further comprises a seal disposed between the mount and the electrode terminal to sealingly connect the electrode terminal and the mount.
The battery cell according to claim 18, wherein the electrode terminal comprises a body portion;

the fixing member includes a flange configured to extend in a direction close to an axis of the electrode lead-out hole and to be located at a side of the main body portion facing away from the inside of the battery cell to restrict movement of the electrode terminal in a direction facing away from the inside of the battery cell, at least a portion of the sealing member being located between the flange and the main body portion.
The battery cell of claim 19, wherein a side of the body portion facing away from the interior of the battery cell has a second surface, the electrode terminal further comprising a boss protruding from the second surface from the body portion, a portion of the seal being located between the second surface and the flange, and a portion of the seal being located between the flange and an outer peripheral surface of the boss.
The battery cell according to any one of claims 1 to 20, wherein the battery cell further comprises a second insulating member including an insulating body portion and an extension portion connected to each other, the insulating body portion being provided on a side of the end cap facing the inside of the battery cell, along an axial direction of the electrode lead-out hole, the extension portion extending from the insulating body portion to a direction close to the electrode terminal into the electrode lead-out hole and surrounding an outer side of the connection portion to separate a wall of the connection portion and the electrode lead-out hole.
A battery comprising the battery cell according to any one of claims 1-21.
A powered device comprising the battery cell of any one of claims 1-21.
A manufacturing apparatus of a battery cell, comprising:

a providing device configured to provide a case having an opening, an electrode assembly having a tab, an end cap provided with an electrode lead-out hole, a terminal assembly, and a current collecting member; the terminal assembly comprises an electrode terminal, the electrode terminal is arranged corresponding to the electrode leading-out hole, and the electrode terminal is used for outputting the electric energy of the battery cell;

An assembling device configured to accommodate the electrode assembly within the case, connect the current collecting member between the electrode terminal and the tab, and electrically connect the electrode terminal and the tab;

the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting the electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is more than or equal to 2mm along the radial direction of the electrode leading-out hole.
A method of manufacturing a battery cell, comprising:

providing a shell, an electrode assembly, an end cover, a terminal assembly and a current collecting member, wherein the shell is provided with an opening, the electrode assembly is provided with a tab, and the end cover is provided with an electrode leading-out hole; the terminal assembly comprises an electrode terminal, the electrode terminal is arranged corresponding to the electrode leading-out hole, and the electrode terminal is used for outputting the electric energy of the battery cell;

accommodating the electrode assembly within the case;

connecting the current collecting member between the electrode terminal and the tab to electrically connect the electrode terminal and the tab;

the current collecting component is provided with a connecting part positioned in the electrode leading-out hole, the connecting part is used for connecting the electrode terminal, the minimum distance H between the hole wall of the electrode leading-out hole and the peripheral wall of the connecting part is more than or equal to 2mm along the radial direction of the electrode leading-out hole.