CN117999700A

CN117999700A - End cover assembly, battery monomer, battery and electric equipment

Info

Publication number: CN117999700A
Application number: CN202280062224.8A
Authority: CN
Inventors: 郑挺; 李全坤; 白璐璐
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-07-01
Filing date: 2022-08-12
Publication date: 2024-05-07
Also published as: CN217468606U; WO2024000747A1

Abstract

The application provides an end cover assembly, a battery monomer, a battery and electric equipment, and relates to the field of batteries. The end cap assembly includes an end cap, an electrode terminal, and a connection member. The end cap is used for closing the opening of the shell. The electrode terminal is disposed at the end cap. The connecting piece is located on the side of the end cover facing away from the shell. The connecting piece comprises a connecting part, an output part and a fusing part. The connection portion is connected to the electrode terminal. The output part is used for outputting or inputting the electric energy of the battery unit. The fusing part is connected with the connecting part and the output part. The end cover component is provided with the connecting piece on one side of the end cover, which is far away from the shell, and the connecting part of the connecting piece is connected with the electrode terminal, so that the tightness of the electrode terminal and the end cover is not affected. The connecting part is connected with the output part through the fusing part, and the fusing part automatically fuses when the current passing through the fusing part is overlarge, so that the connecting part and the output part are disconnected to play a role in protection. Because the fusing part is positioned on one side of the end cover, which is far away from the shell, the fusing part can not contact with electrolyte after fusing, and the electrolyte can not be ignited, so that the safety is improved.

Description

End cover assembly, battery monomer, battery and electric equipment

Cross Reference to Related Applications

The present application claims priority from chinese patent application entitled "end cap assembly, battery cell, battery and powered device" (application number 2022216686656) filed on month 07 of 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the field of batteries, in particular to an end cover assembly, a battery monomer, a battery and electric equipment.

Background

Batteries are widely applied in the field of new energy, such as electric automobiles, new energy automobiles and the like, and the new energy automobiles and the electric automobiles have become new development trends of automobile industry. The development of battery technology is taking into consideration various design factors such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the safety of the battery. However, the current battery cells are prone to fire or explosion when overloaded or short-circuited, and have poor safety.

Disclosure of Invention

The embodiment of the application aims to provide an end cover assembly, a battery cell, a battery and electric equipment, and aims to solve the problems that in the related art, the battery cell is easy to fire, even explode and has poor safety when overloaded or short-circuited.

In a first aspect, an embodiment of the present application provides an end cap assembly for a battery cell, the battery cell including a housing, the end cap assembly including an end cap for closing an opening of the housing, an electrode terminal, and a connecting member; the electrode terminals are arranged on the end cover; the connecting piece is positioned at one side of the end cover, which is away from the shell, and comprises a connecting part, an output part and a fusing part, wherein the connecting part is connected with the electrode terminal; the output part is used for outputting or inputting the electric energy of the battery monomer; the fusing part is connected with the connecting part and the output part.

In the technical scheme, the end cover assembly is provided with the connecting piece on one side of the end cover, which is away from the shell, and the connecting part of the connecting piece is connected with the electrode terminal, so that the sealing performance of the electrode terminal and the end cover is not affected, and the sealing difficulty is not increased. The connecting part is connected with the output part through the fusing part, and the fusing part automatically fuses when the current passing through the fusing part is overlarge, so that the connecting part and the output part are disconnected to play a role in protection. In addition, because the fusing part is positioned on one side of the end cover, which is far away from the shell, the fusing part can not contact with electrolyte after fusing, and the electrolyte can not be ignited, so that the safety is improved.

As an alternative solution of the embodiment of the present application, the end cap assembly includes an insulating member, and the insulating member is at least partially wrapped around the fusing part.

In the above technical scheme, through the at least partial cladding of insulating part in the fusing portion, on the one hand, when the fusing portion receives external force, can transmit external force to the insulating part to disperse external force, reduce the possibility that the fusing portion is destroyed because of receiving external force. On the other hand, the insulating part at least partially coats the fusing part, so that the contact area between the fusing part and air is reduced, and a certain flame retardant effect can be achieved when the fusing part fuses. In addition, the insulating piece can be made of flame-retardant materials so as to achieve better flame-retardant effect.

As an alternative solution of the embodiment of the present application, the insulating member is at least partially located between the end cap and the connecting member, so as to insulate the connecting member from the end cap.

In the technical scheme, the insulating piece is at least partially positioned between the end cover and the connecting piece, so that the connecting piece is insulated from the end cover, and the short circuit caused by the contact between the end cover and the connecting piece is avoided.

As an alternative solution of the embodiment of the present application, the end cover is provided with a recess, and at least a portion of the insulating member is matched with the recess in a positioning manner.

In the technical scheme, the insulating piece is matched with the concave part in a positioning manner, so that the insulating piece is positioned, the insulating piece is prevented from shifting, and the wrapping effect on the fusing part is lost.

As an optional technical solution of the embodiment of the present application, the insulating member includes a first cladding portion, a second cladding portion, and a third cladding portion that are sequentially connected, where the first cladding portion is wrapped by the fusing portion, the second cladding portion is wrapped by the connecting portion, and the third cladding portion is wrapped by the output portion.

In the above technical scheme, through first cladding portion cladding fusing portion, promote the intensity of fusing portion, reduce the possibility that fusing portion is destroyed because of receiving external force, play flame retardant efficiency when fusing portion fuses simultaneously. The connecting part is covered by the second covering part, so that the connecting part is insulated and isolated from the end cover, and short circuit caused by contact between the connecting part and the end cover is avoided. The output part is covered by the third covering part, so that the output part is insulated and isolated from the end cover, and the short circuit caused by the contact between the output part and the end cover is avoided. Further, since the connection portion is covered with the second covering portion and the output portion is covered with the third covering portion, erroneous connection (i.e., connection of the connection portion to the load) is less likely to occur when the output portion is connected to the load. Furthermore, the first cladding part, the second cladding part and the third cladding part are sequentially connected, so that the integrity is good, the connecting part, the fusing part and the output part can be protected, and the connecting piece is not easy to damage due to external force.

As an optional solution of the embodiment of the present application, the end cover is provided with a recess, and at least one of the first cladding portion, the second cladding portion, and the third cladding portion is accommodated in the recess.

In the above technical solution, at least one of the first coating portion, the second coating portion and the third coating portion is accommodated in the recess portion to position the insulating member, so as to avoid displacement of the insulating member, and to make the coating of the first coating portion, the second coating portion or the third coating portion fail.

As an optional solution of the embodiment of the present application, the first cladding portion, the second cladding portion, and the third cladding portion are all accommodated in the recess.

In the technical scheme, the first cladding part, the second cladding part and the third cladding part are all accommodated in the concave part, the positioning effect of the insulating part is good, the relative position of the insulating part and the end cover is not easy to change, and the insulating part can play a good insulating role.

As an optional technical solution of the embodiment of the present application, the end cover partially protrudes along a thickness direction of the end cover to form a convex portion, the first cladding portion is disposed on the convex portion, and at least a portion of the third cladding portion is accommodated in the concave portion.

In the above technical scheme, the part of the end cover protrudes along the thickness direction to form a convex part, one side of the end cover opposite to the convex part in the thickness direction of the end cover correspondingly forms a concave space, and the concave space can accommodate the parts inside the battery cell, so that the energy density of the battery cell is improved. The first cladding part is arranged on the convex part, so that the fusing part clad by the first cladding part is also positioned on the convex part, the fusing part does not need to be bent, and the strength of the fusing part is guaranteed. At least a portion of the third coating portion is received in the recess to facilitate positioning of the insulator.

As an optional technical solution of the embodiment of the present application, the output portion includes a first connection section, an output section, and a second connection section, where the first connection section is connected with the fusing portion; the output section is used for outputting or inputting the electric energy of the battery unit; the second connecting section is connected with the first connecting section and the output section, the output part is bent at the second connecting section, and the first connecting section and the output section extend along opposite directions at two ends of the second connecting section; the third coating part coats the output section and is partially accommodated in the concave part.

In the above technical scheme, through forming the bending at the second linkage segment and making there be the fall along the thickness direction first linkage segment of end cover and output section to be connected to the fusing portion in order to make first linkage segment, the output section is convenient for export battery monomer electric energy. The third coating part coats the output section and is partially accommodated in the concave part so as to position the insulating part and prevent the insulating part from being shifted to fail.

As an optional technical solution of the embodiment of the present application, the connection portion has a mounting hole for mounting the electrode terminal, and the second coating portion is provided with a first avoidance hole at a position corresponding to the mounting hole on a side facing away from the end cover.

In the above technical scheme, through setting up first hole of dodging, for connecting portion and electrode terminal's coupling equipment clearance to coupling portion and electrode terminal link together through first hole of dodging of coupling equipment pass.

As an alternative technical scheme of the embodiment of the application, the diameter of the first avoiding hole is 10-15 mm.

In the above technical scheme, the diameter of the first avoidance hole is limited to 10-15 mm (including 10mm and 15 mm), so that the avoidance of the connecting device can be ensured, and meanwhile, the high coating effect is achieved, and the wrong connection (namely, the connecting part is connected with the load) is not easy to occur when the output part is connected with the load. If the diameter of the first avoiding hole is smaller than 10mm, the second coating portion is easy to interfere with the connecting device, and therefore the connecting effect is affected or the second coating portion is damaged. If the diameter of the first avoiding hole is larger than 15mm, the second coating portion cannot well coat the connecting portion, and cannot protect the connecting portion, and when the output portion is connected to a load, misconnection (i.e., the connecting portion is connected to the load) is likely to occur.

As an optional technical solution of the embodiment of the present application, a second avoidance hole is provided on a side of the third coating portion facing away from the end cover, and a connection area exposed to the outside is formed at a position corresponding to the second avoidance hole by the output portion.

In the above technical scheme, through setting up the second and dodging the hole for the output portion dodges the position that the hole corresponds with the second and exposes to the external world and form the connecting region, the connecting region is used for being connected with the load, in order to export battery monomer's electric energy or to battery monomer input electric energy.

As an optional technical solution of the embodiment of the present application, the connection area is convexly provided with a protruding portion, and the protruding portion is at least partially accommodated in the second avoidance hole.

In the above technical scheme, through setting up the bulge, be convenient for wiring or welding busbar to be connected load and bulge electricity, with the single electric energy of output battery or to single input electric energy of battery.

As an alternative solution of the embodiment of the present application, along the thickness direction of the end cover, the output portion has a first surface facing away from the end cover, and the second cladding portion has a second surface facing away from the end cover, where the second surface exceeds the first surface by 0.1-0.5 mm.

In the above technical scheme, the second surface exceeds the first surface by 0.1-0.5 mm, so that the wiring or the bus bar welding on the output part is facilitated, the load and the output part are electrically connected, and the foolproof effect is achieved when the output part and the load are connected, so that the wrong connection (namely, the connection part is connected to the load) is not easy to occur, and the wiring harness or the bus bar and the insulating part can be prevented from interfering to a certain extent after the wiring or the bus bar welding. If the second surface exceeds the first surface by less than 0.1mm, the convenience of wiring or welding the busbar on the output part is improved obviously, the fool-proof effect is poor, and after wiring or welding the busbar, the wiring harness or the busbar is easy to interfere with the insulating piece. If the height of the second surface exceeds the first surface by more than 0.5mm, the protruding height of the output part is too high, and interference with other structures is easy to occur.

As an alternative solution of the embodiment of the present application, the insulating member is an injection molded member molded on a surface of the connecting member.

In the technical scheme, the insulating part is injection molded on the surface of the connecting part, so that the insulating part can be attached to the surface of the connecting part, and the coating effect on the connecting part is good. Meanwhile, the insulating piece isolates the fusing part from the outside, so that air between the fusing part and the insulating piece is less or no air, and when the fusing part fuses, the fusing part is not easy to burn due to lack of air, and the end cover assembly is not easy to cause fire, so that the safety is high.

As an alternative technical scheme of the embodiment of the application, the output part, the connecting part and the fusing part are integrally formed.

In the technical scheme, the output part, the connecting part and the fusing part are integrally formed, so that the connecting strength of the output part, the connecting part and the fusing part is good. In addition, the output part, the connecting part and the fusing part are integrally formed, compared with welding, the process is fewer, the welding is simpler, and the production cost can be reduced.

As an alternative technical scheme of the embodiment of the application, the fusing part is formed by forming a groove or a through hole on the connecting piece in a thinning way.

In the above technical scheme, the connecting piece is provided with the groove or the through hole for thinning, and the residual part after thinning is larger in resistance, so that the heat at the thinned position is larger and is easier to fuse when the connecting piece passes through current, thereby forming the fusing part.

In a second aspect, an embodiment of the present application further provides a battery unit, where the battery unit includes an electrode assembly, a case, and the end cap assembly described above, and the case has an accommodating space with an opening at one end, where the accommodating space is used to accommodate the electrode assembly; the end cap is connected to the housing and closes the opening.

In a third aspect, an embodiment of the present application further provides a battery, where the battery includes a case and the battery unit described above, and the battery unit is accommodated in the case.

In a fourth aspect, an embodiment of the present application further provides an electrical apparatus, where the electrical apparatus includes the battery described above.

Drawings

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

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

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

Fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell according to some embodiments of the present application;

FIG. 4 is an exploded view of an end cap assembly provided in accordance with some embodiments of the present application;

FIG. 5 is a schematic illustration of an end cap assembly according to some embodiments of the present application;

FIG. 6 is a schematic structural view of a connector according to some embodiments of the present application;

FIG. 7 is a schematic view of an insulator according to some embodiments of the present application;

FIG. 8 is a schematic top view of an end cap assembly according to some embodiments of the present application;

FIG. 9 is a cross-sectional view taken at the A-A position of FIG. 8;

FIG. 10 is a schematic view of an insulating member according to other embodiments of the present application;

FIG. 11 is a schematic view of an insulator according to still other embodiments of the present application;

FIG. 12 is an exploded view of an end cap assembly provided in accordance with other embodiments of the present application;

FIG. 13 is a schematic view of an end cap assembly according to further embodiments of the present application;

FIG. 14 is a schematic view of a connector according to other embodiments of the present application;

FIG. 15 is a schematic view of an end cap according to other embodiments of the present application;

FIG. 16 is a schematic view of a connector according to still other embodiments of the present application;

FIG. 17 is a schematic view of a connecting member (with two through holes to form a fuse part) according to some embodiments of the present application;

FIG. 18 is a schematic view of a connecting member (with a through hole formed to form a fuse portion) according to some embodiments of the present application;

Fig. 19 is a schematic structural view of a connector (with a groove to form a fusing part) according to some embodiments of the present application.

Icon: 10-a box body; 11-a first part; 12-a second part; 20-battery cells; a 21-end cap assembly; 211-end caps; 2111—a recess; 2112-third through hole; 2113-projecting; 212-electrode terminals; 213-connectors; 2131-a connection; 21311-mounting holes; 2132-a fuse portion; 2133-an output; 21331-projections; 21332—a first surface; 21333-a first connection segment; 21334-output segment; 21335-a second connection segment; 214-an insulator; 2141-a first cladding; 2142-a second cladding; 21421-first escape holes; 21422-second through holes; 21423-a second surface; 2143-a third cladding; 21431-a second escape hole; 215-a seal; 216-insulator; 2161-first through holes; 2162-protrusions; 22-electrode assembly; 23-a housing; 100-cell; 200-a controller; 300-motor; 1000-vehicle.

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 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. 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

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

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

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

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

Currently, the more widely the battery is used in view of the development of market situation. The 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, as well as a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the battery application field, the market demand thereof is also continuously expanding.

The development of battery technology is taking into consideration various design factors such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the safety of the battery. However, the current battery cells are prone to fire or explosion when overloaded or short-circuited, and have poor safety.

The inventors have further studied and found that the existing battery cell is provided with a fusing structure for overload protection, but the fusing structure is disposed inside the battery cell. When the current passing through the fusing structure is too large to cause the fusing structure to fuse, the fusing structure easily ignites the electrolyte, thereby causing the battery cell to fire or even explode.

In view of this, an embodiment of the present application provides an end cap assembly including an end cap, an electrode terminal, and a connection member. The end cover is used for closing the opening of the shell, and the electrode terminals are arranged on the end cover. The connecting piece is located on the side of the end cover facing away from the shell. The connecting piece comprises a connecting part, an output part and a fusing part. The connection part is connected with the electrode terminal, and the output part is used for outputting or inputting the electric energy of the battery cell. The fusing part is connected with the connecting part and the output part.

The fusing part of this end cover subassembly is located one side that deviates from the casing of end cover, and fusing part is located the outside of battery monomer promptly, like this, fusing part can fuse by oneself and play the guard action when the electric current through fusing part is too big, because fusing part is located one side that deviates from the casing of end cover, can not contact with electrolyte after its fusing, can not ignite the electrolyte, safer.

In addition, this end cover subassembly sets up the connecting piece through the one side that deviates from the casing at the end cover, and the connecting portion and the electrode terminal of connecting piece are connected, can not cause the influence to the leakproofness of electrode terminal and end cover, can not increase the sealed degree of difficulty.

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. 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, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or 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 present 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, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery cell or a primary battery cell; but not limited to, lithium sulfur battery cells, sodium ion battery cells, or magnesium ion battery cells. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery 100. As shown in fig. 3, the battery cell 20 includes an end cap assembly 21, an electrode assembly 22, and a case 23.

The end cap assembly 21 includes an end cap 211, which means a member that is covered at the opening of the case 23 to isolate the inner environment of the battery cell 20 from the outer environment. Without limitation, the shape of the end cap 211 may be adapted to the shape of the housing 23 to fit the housing 23. Optionally, the end cover 211 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cover 211 is not easy to deform when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the safety performance can be improved. The material of the end cap 211 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The case 23 is an assembly for cooperating with the end cap 211 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to accommodate the electrode assembly 22, the electrolyte, and other components. The case 23 and the end cap 211 may be separate members, and an opening may be provided in the case 23, and the interior of the battery cell 20 may be formed by closing the opening with the end cap 211 at the opening. The end cap 211 and the housing 23 may be integrated, and specifically, the end cap 211 and the housing 23 may form a common connection surface before other components are put into the housing, and when the interior of the housing 23 needs to be sealed, the end cap 211 is covered with the housing 23. The housing 23 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 23 may be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 23 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 may be contained within the housing 23. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having active material constitute the main body portion of the electrode assembly 22, and the portions of the positive and negative electrode sheets having no active material constitute the tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte.

Referring to fig. 4, 5, 6, 7, 8 and 9, fig. 4 is an exploded view of an end cap assembly 21 according to some embodiments of the present application. Fig. 5 is a schematic diagram of an end cap assembly 21 according to some embodiments of the present application. Fig. 6 is a schematic structural diagram of a connector 213 according to some embodiments of the present application. Fig. 7 is a schematic structural diagram of an insulating member 214 according to some embodiments of the present application. Fig. 8 is a schematic top view of an end cap assembly 21 according to some embodiments of the present application. Fig. 9 is a cross-sectional view of the position A-A of fig. 8. The embodiment of the application provides an end cover assembly 21, wherein the end cover assembly 21 is used for a battery cell 20, and the battery cell 20 comprises a shell 23. The cap assembly 21 includes a cap 211, an electrode terminal 212, and a connector 213. The cap 211 is used to close the opening of the case 23, and the electrode terminal 212 is provided to the cap 211. The connector 213 is located on the side of the end cap 211 facing away from the housing 23. The connector 213 includes a connection portion 2131, an output portion 2133, and a fusing portion 2132. The connection portion 2131 is connected to the electrode terminal 212, and the output portion 2133 is used to output or input electric energy to or from the battery cell 20. The fusing portion 2132 is connected to the connecting portion 2131 and the output portion 2133.

The electrode terminals 212 are members for electrically connecting with the electrode assembly 22 for outputting or inputting electric power of the battery cells 20. The electrode terminal 212 is disposed on the end cap 211, for example, a third through hole 2112 may be formed in the end cap 211, and the electrode terminal 212 at least partially protrudes into the third through hole 2112.

The connector 213 is made of a conductive material and has a conductive member. The connection member 213 is integrally located at a side of the end cap 211 facing away from the case 23, or the connection member 213 is located at a side of the end cap 211 facing away from the electrode assembly 22.

The connection portion 2131 is a portion of the connection member 213 connected to the electrode terminal 212, and the connection portion 2131 is connected to the electrode terminal 212 to limit the connection member 213 on the one hand and to enable the connection member 213 to receive electric energy output from the battery cell 20 or to input electric energy into the battery cell 20 on the other hand. Optionally, the connection portion 2131 is provided with a mounting hole 21311, and the electrode terminal 212 extends into the mounting hole 21311 to be connected to the connection portion 2131. For example, the connecting portion 2131 is riveted to the electrode terminal 212.

The fusing portion 2132 is a member of the connector 213 that serves as a fuse protector. The fusing portion 2132 is fused when the current passing therethrough is excessive, and thus the connecting portion 2131 and the output portion 2133 are disconnected, thereby achieving a short-circuit protection or overload protection function.

The output portion 2133 is a portion of the connection member 213 for electrical connection with a load to supply the electric power of the battery cell 20 outputted or inputted from the electrode terminal 212 to the load.

The end cover assembly 21 is provided with the connecting piece 213 at one side of the end cover 211, which is far away from the shell 23, and the connecting part 2131 of the connecting piece 213 is connected with the electrode terminal 212, so that the tightness between the electrode terminal 212 and the end cover 211 is not affected, and the sealing difficulty is not increased. The connection portion 2131 and the output portion 2133 are connected by a fuse portion 2132, and when the current passing through the fuse portion 2132 is excessive, the fuse portion 2132 automatically fuses, and the connection portion 2131 and the output portion 2133 are disconnected to protect the device. In addition, since the fusing part 2132 is positioned at the side of the end cover 211 facing away from the case 23, it will not contact with the electrolyte after fusing, and will not ignite the electrolyte, thus being safer.

In some embodiments, the end cap assembly 21 includes a seal 215, the seal 215 being sealingly disposed between the electrode terminal 212 and the end cap 211 to seal the electrode terminal 212 and the end cap 211 from leakage of electrolyte between the electrode terminal 212 and the end cap 211. Illustratively, the seal 215 may be a sealant, gasket, or sheet seal, or the like. Optionally, the electrode terminal 212 is at least partially penetrated through the sealing member 215, and the sealing member 215 partially protrudes into the third through hole 2112 to seal the electrode terminal 212 with the inner wall of the third through hole 2112.

In some embodiments, end cap assembly 21 includes insulator 216, insulator 216 being located on the side of end cap 211 facing housing 23, insulator 216 may be used to isolate electrode assembly 22 from end cap 211 to reduce the risk of shorting. By way of example, the insulator 216 may be plastic, rubber, or the like. Optionally, the insulator 216 is provided with a first through hole 2161 through which the electrode terminal 212 passes, so as to allow the electrode terminal 212 to pass through the insulator 216 and extend into the third through hole 2112.

In some embodiments, the end cap assembly 21 includes an insulator 214, the insulator 214 at least partially surrounding the fuse portion 2132.

The insulating member 214 is made of a material having insulating properties, such as plastic or rubber. The term "the insulating member 214 at least partially covers the fusing part 2132" includes both the case where the insulating member 214 covers a part of the fusing part 2132 and the case where the insulating member 214 completely covers the fusing part 2132.

When the portion of the insulating member 214 covering the fusing part 2132 is located between the end cap 211 and the fusing part 2132, the insulating member 214 may insulate the end cap 211 from the fusing part 2132 to prevent the end cap 211 from being electrically connected with the fusing part 2132, resulting in the occurrence of a short circuit of the battery cell 20.

The insulating material 214 is at least partially wrapped around the fusing portion 2132, so that when the fusing portion 2132 receives an external force, the external force can be transmitted to the insulating material 214 to disperse the external force, thereby reducing the possibility that the fusing portion 2132 is damaged by the external force. On the other hand, the insulating material 214 is at least partially covered on the fusing part 2132, so that the contact area between the fusing part 2132 and the air is reduced, and a certain flame retardant effect can be achieved when the fusing part 2132 is fused. In addition, the insulator 214 may be made of a flame retardant material to provide better flame retardance.

In some embodiments, insulation 214 is located at least partially between end cap 211 and connector 213 to insulate connector 213 from end cap 211.

"Insulating member 214 is at least partially between end cap 211 and connecting member 213" includes both schemes where insulating member 214 is entirely between end cap 211 and connecting member 213 and where insulating member 214 is partially between end cap 211 and connecting member 213.

When the insulating member 214 is entirely located between the end cap 211 and the connecting member 213, the insulating member 214 covers only the surface of the fusing part 2132 facing the end cap 211. Optionally, along the thickness direction of the end cover 211, the projection of the insulating member 214 on the end cover 211 and the projection of the connecting member 213 on the end cover 211 completely coincide, and at this time, the insulating member 214 has a better insulating effect, so that the connecting member 213 and the end cover 211 can be insulated and isolated, and short circuit caused by contact between the connecting member 213 and the end cover 211 is avoided.

When the insulator 214 is partially located between the end cap 211 and the connector 213, the insulator 214 may cover other surfaces of the fuse portion 2132 or may cover the connector 2131 and/or the output portion 2133.

By having the insulator 214 at least partially between the end cap 211 and the connector 213, the connector 213 is insulated from the end cap 211, preventing the end cap 211 from shorting out from contact with the connector 213.

In some embodiments, the end cap 211 is provided with a recess 2111, and at least a portion of the insulator 214 is in positioning engagement with the recess 2111.

The end cap 211 has an outer surface facing away from the housing 23 and an inner surface facing toward the housing 23, and the recess 2111 is recessed from the outer surface in a direction approaching the inner surface. Illustratively, the recess 2111 is a groove. The third through hole 2112 is opened at the bottom surface of the recess 2111.

"At least a portion of the insulator 214 is in positioning engagement with the recess 2111" includes both a portion of the insulator 214 in positioning engagement with the recess 2111 and an entirety of the insulator 214 in positioning engagement with the recess 2111.

Wherein, when the whole of the insulator 214 is positioned and matched with the concave portion 2111, the outline of the concave portion 2111 and the shape of the insulator 214 can be approximately matched so as to obtain a better positioning effect.

In some embodiments, at least a portion of the insulator 214 is embedded in the recess 2111 to provide a positive fit of the insulator 214 with the recess 2111.

Referring to fig. 4 and 9, in some embodiments, the insulating member 214 extends into the third through hole 2112 and is attached to the wall of the third through hole 2112. On the one hand, the insulating member 214 can insulate the electrode terminal 212 from the cap 211, and prevent the electrode terminal 212 from being in contact with the cap 211 to cause a short circuit. On the other hand, the position of the insulator 214 can be restricted so that the insulator 214 is not easily moved relative to the end cap 211.

By positioning the insulator 214 in cooperation with the recess 2111, the insulator 214 is positioned so as to prevent the insulator 214 from being displaced, and the wrapping effect on the fusing portion 2132 is lost.

In some embodiments, the insulator 214 includes a first cladding 2141, a second cladding 2142, and a third cladding 2143 connected in sequence. The first wrapping portion 2141 wraps the fusing portion 2132, the second wrapping portion 2142 wraps the connecting portion 2131, and the third wrapping portion 2143 wraps the output portion 2133.

The first cladding portion 2141 is a portion of the insulating material 214 that wraps the fusing portion 2132, the second cladding portion 2142 is a portion of the insulating material 214 that wraps the connecting portion 2131, and the third cladding portion 2143 is a portion of the insulating material 214 that wraps the output portion 2133. The first, second, and third coating portions 2141, 2142, 2143 each have an insulating function, and can insulate the fusing portion 2132 from the end cap 211, the connecting portion 2131 from the end cap 211, and the output portion 2133 from the end cap 211, respectively.

The wall surface of the first covering portion 2141 facing the end cap 211 is provided with a second through hole 21422, and the second through hole 21422 is used for the electrode terminal 212 to pass through, so that the electrode terminal 212 extends into the mounting hole 21311 of the connecting portion 2131.

Referring to fig. 7 and 9, in some embodiments, the first cladding portion 2141 fully clads the fusing portion 2132, the second cladding portion 2142 clads a portion of the connecting portion 2131 (the second cladding portion 2142 clads a surface of the connecting portion 2131 facing the end cap 211, also clads multiple sides of the connecting portion 2131 and clads a portion of a surface of the connecting portion 2131 facing away from the end cap 211), and the third cladding portion 2143 clads a portion of the output portion 2133 (the third cladding portion 2143 clads a surface of the output portion 2133 facing the end cap 211, also clads multiple sides of the output portion 2133 and clads a portion of a surface of the output portion 2133 facing away from the end cap 211).

The first wrapping portion 2141 wraps the fused portion 2132, thereby improving the strength of the fused portion 2132, reducing the possibility that the fused portion 2132 is damaged by external force, and providing flame retardant effect when the fused portion 2132 is fused. The second coating portion 2142 coats the connection portion 2131, thereby insulating the connection portion 2131 from the end cap 211, and preventing the connection portion 2131 from coming into contact with the end cap 211 to cause a short circuit. By wrapping the output portion 2133 with the third wrapping portion 2143, the output portion 2133 is insulated from the end cap 211, thereby preventing the output portion 2133 from coming into contact with the end cap 211 and shorting. Further, since the connection portion 2131 is covered with the second covering portion 2142, and the output portion 2133 is covered with the third covering portion 2143, erroneous connection (i.e., connection of the connection portion 2131 to a load) is less likely to occur when the output portion 2133 is connected to the load. Further, the first, second and third coating portions 2141, 2142, 2143 are connected in order, and the integrity is good, so that the connection portion 2131, the fusing portion 2132 and the output portion 2133 can be protected, and the connection element 213 is not easily damaged by external force.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an insulating member 214 according to another embodiment of the application. In other embodiments, the first cladding portion 2141 fully clads the fusing portion 2132, the second cladding portion 2142 clads a portion of the connecting portion 2131 (the second cladding portion 2142 clads a surface of the connecting portion 2131 facing the end cap 211 and multiple sides of the connecting portion 2131), and the third cladding portion 2143 clads a portion of the output portion 2133 (the third cladding portion 2143 clads a surface of the output portion 2133 facing the end cap 211 and multiple sides of the output portion 2133).

Referring to fig. 11, fig. 11 is a schematic structural diagram of an insulating member 214 according to still another embodiment of the present application. In still other embodiments, the first cladding 2141 completely claddings the fusing part 2132, the second cladding 2142 claddings a portion of the connecting part 2131 (the second cladding 2142 claddings a surface of the connecting part 2131 facing the end cap 211, also claddings a portion of the plurality of sides of the connecting part 2131 and a surface of the connecting part 2131 facing away from the end cap 211), and the third cladding 2143 claddings a portion of the output part 2133 (the third cladding 2143 claddings a surface of the output part 2133 facing the end cap 211 and a plurality of sides of the output part 2133).

Of course, the first, second, and third coating portions 2141, 2142, and 2143 may also coat different surfaces of the fusing portion 2132, the connecting portion 2131, and the output portion 2133, as needed.

In some embodiments, the end cap 211 is provided with a recess 2111, and at least one of the first cladding 2141, the second cladding 2142, and the third cladding 2143 is received in the recess 2111.

"At least one of the first, second, and third coating portions 2141, 2142, and 2143 is accommodated in the recess 2111" includes one of the first, second, and third coating portions 2141, 2142, and 2143 being accommodated in the recess 2111; two of the first, second, and third coating portions 2141, 2142, 2143 are accommodated in the recess 2111; the first coating portion 2141, the second coating portion 2142, and the third coating portion 2143 are each accommodated in the recess 2111.

By accommodating at least one of the first, second, and third coating portions 2141, 2142, 2143 in the recess 2111 to position the insulating member 214, displacement of the insulating member 214 is avoided, and coating of the first, second, or third coating portions 2141, 2142, 2143 fails.

In some embodiments, the first, second, and third cladding portions 2141, 2142, 2143 are each received in the recess 2111.

The first cladding portion 2141, the second cladding portion 2142 and the third cladding portion 2143 are all accommodated in the recess 2111, so that the positioning effect of the insulating member 214 is good, the relative positions of the insulating member 214 and the end cover 211 are not easy to change, and the insulating member 214 can perform a good insulating function.

Referring to fig. 12, 13, 14 and 15, fig. 12 is an exploded view of an end cap assembly 21 according to other embodiments of the present application. Fig. 13 is a schematic view of an end cap assembly 21 according to other embodiments of the present application. Fig. 14 is a schematic structural diagram of a connecting member 213 according to another embodiment of the present application. Fig. 15 is a schematic structural diagram of an end cap 211 according to other embodiments of the present application. In some embodiments, the end cap 211 partially protrudes in the thickness direction of the end cap 211 to form a protrusion 2113, and the first cladding 2141 is disposed on the protrusion 2113. At least a part of the third covering portion 2143 is accommodated in the recess 2111.

The protrusions 2113 protrude from the outer surface of the end cap 211, and a recess space is formed in the inner surface of the end cap 211 at a position corresponding to the protrusions 2113, the recess space being capable of accommodating components inside the battery cell 20.

The part of the end cap 211 protrudes in the thickness direction thereof to form a protrusion 2113, and a side of the end cap 211 opposite to the protrusion 2113 in the thickness direction thereof is correspondingly formed with a recess space capable of accommodating the components inside the battery cell 20, which is advantageous in improving the energy density of the battery cell 20. The first wrapping portion 2141 is provided on the protrusion 2113, so that the fused portion 2132 wrapped by the first wrapping portion 2141 is also located on the protrusion 2113, and the fused portion 2132 does not need to be bent, which is advantageous in ensuring the strength of the fused portion 2132. At least a portion of the third cladding 2143 is received in the recess 2111 to facilitate positioning of the insulator 214.

In some embodiments, the insulator 216 partially protrudes in the thickness direction of the end cap 211 to form a protrusion 2162, and the protrusion 2162 protrudes in the same direction as the protrusion 2113, and the protrusion 2162 protrudes into the recess space. The protrusion 2162 is provided with the first through hole 2161.

In some embodiments, the output 2133 includes a first connection segment 21333, an output segment 21334, and a second connection segment 21335. The first connecting section 21333 is connected to the fuse 2132, the output section 21334 is used for outputting or inputting electric energy of the battery cell 20, and the second connecting section 21335 is connected to the first connecting section 21333 and the output section 21334. The output portion 2133 is bent at the second connecting section 21335, and the first connecting section 21333 and the output section 21334 extend in opposite directions at both ends of the second connecting section 21335. The portion of the third covering portion 2143 covering the output section 21334 is accommodated in the recess 2111.

The first connection segment 21333 is a portion of the output portion 2133 connected to the fused portion 2132. The output segment 21334 is a portion of the output portion 2133 connected to a load to output electric power of the battery cell 20 or input electric power to the battery cell 20. The second connecting section 21335 is a portion of the output portion 2133 connecting the first connecting section 21333 and the output section 21334.

The first connecting section 21333 and the output section 21334 are arranged in parallel, the first connecting section 21333 extending from one end of the second connecting section 21335 in a direction away from the output section 21334, and the output section 21334 extending from the other end of the second connecting section 21335 in a direction away from the first connecting section 21333. For example, the first connecting section 21333 extends leftward from one end of the second connecting section 21335 along the first connecting section 21333, and the output section 21334 extends rightward from the other end of the second connecting section 21335.

The connection positions of the first connection segment 21333 and the second connection segment 21335 are bent, and the connection positions of the second connection segment 21335 and the output segment 21334 are bent so that the first connection segment 21333 and the second connection segment 21335 are parallel and the first connection segment 21333 and the second connection segment 21335 are connected.

By forming the second connecting segment 21335 to be bent such that there is a drop in the first connecting segment 21333 and the output segment 21334 in the thickness direction of the end cap 211, the output segment 21334 facilitates the connection of the first connecting segment 21333 to the fusing portion 2132 and the output of the electrical energy of the battery cell 20. The third covering portion 2143 covers a portion of the output section 21334 and is received in the recess 2111 to facilitate positioning of the insulator 214 and prevent the insulator 214 from being displaced and failing.

In some embodiments, the shape of the third coating portion 2143 matches the shape of the output portion 2133 to achieve better coating effect.

In some embodiments, the connection portion 2131 has a mounting hole 21311 in which the electrode terminal 212 is mounted. The second covering portion 2142 is provided with a first escape hole 21421 at a position corresponding to the mounting hole 21311 on a side facing away from the end cap 211.

The mounting hole 21311 is a through hole or a blind hole formed in the connecting portion 2131. The electrode terminal 212 protrudes into the mounting hole 21311 to be connected with the connection portion 2131. For example, the connection portion 2131 is riveted to the electrode terminal 212.

The first relief hole 21421 is a through hole formed in a side of the second covering portion 2142 facing away from the end cap 211, and the first relief hole 21421 can expose a portion of the connection portion 2131 so as to connect the connection portion 2131 with the electrode terminal 212.

By providing the first escape hole 21421, a space is left for the connection device connecting the connection portion 2131 and the electrode terminal 212, so that the connection device passes through the first escape hole 21421 to connect the connection portion 2131 and the electrode terminal 212 together.

In some embodiments, the first relief hole 21421 has a diameter of 10-15 mm.

The first avoidance hole 21421 is a circular hole, and the first avoidance hole 21421 is coaxially arranged with the mounting hole 21311.

The diameter of the first relief hole 21421 may be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

Limiting the diameter of the first avoidance hole 21421 to 10-15 mm (including 10mm and 15 mm) can ensure that the connection device is avoided, and meanwhile, the connection device has a good coating effect, so that when the output part 2133 is connected with a load, the connection device is not easy to misconnection (namely, the connection part 2131 is connected with the load). If the diameter of the first escape hole 21421 is less than 10mm, the second cladding 2142 is easily interfered with the connection device, thereby affecting the connection effect or damaging the second cladding 2142. If the diameter of the first escape hole 21421 is larger than 15mm, the second covering portion 2142 does not cover the connection portion 2131 well, and the connection portion 2131 cannot be protected, and when the output portion 2133 is connected to a load, a misconnection (i.e., connection of the connection portion 2131 to the load) is likely to occur.

In some embodiments, the third covering portion 2143 is provided with a second relief hole 21431 at a side facing away from the end cap 211, and the output portion 2133 forms a connection area exposed to the outside at a position corresponding to the second relief hole 21431.

The second avoidance hole 21431 is a through hole formed on a side of the third covering portion 2143 away from the end cap 211, and the second avoidance hole 21431 can expose a portion of the output portion 2133, so that the output portion 2133 is connected to a load.

The connection area is an area of the output portion 2133 exposed by the second relief hole 21431, and may be used for wiring or welding a busbar to electrically connect the output portion 2133 with a load.

By providing the second avoidance hole 21431, a connection region is formed by exposing the position of the output portion 2133 corresponding to the second avoidance hole 21431 to the outside, the connection region being used for being connected with a load to output electric energy of the battery cell 20 or input electric energy to the battery cell 20.

In some embodiments, the attachment region is provided with a protrusion 21331 protruding therefrom, and the protrusion 21331 is at least partially received within the second relief aperture 21431.

The protruding portion 21331 is a boss structure protruding from the connection region. The protrusion 21331 may be completely received in the second relief hole 21431, or may extend out of an end of the second relief hole 21431 facing away from the end cap 211.

By providing the protrusion 21331, wiring or welding of the bus bar is facilitated to electrically connect the load with the protrusion 21331 to output power of the battery cell 20 or input power to the battery cell 20.

In some embodiments, the output portion 2133 has a first surface 21332 facing away from the end cap 211 and the second coating 2142 has a second surface 21423 facing away from the end cap 211 in a thickness direction of the end cap 211. The second surface 21423 extends 0.1-0.5 mm beyond the first surface 21332.

The first surface 21332 is a surface of the output portion 2133 facing away from the end cap 211, and the first surface 21332 is farther from the end cap 211 than other surfaces of the output portion 2133 are from the end cap 211 in the thickness direction of the end cap 211. For example, in an embodiment in which the connection region is provided with a protrusion 21331, the surface of the protrusion 21331 facing away from the end cap 211 is the surface of the output portion 2133 facing away from the end cap 211.

The second surface 21423 is a surface of the second covering portion 2142 facing away from the end cap 211, and the second surface 21423 is farther from the end cap 211 than other surfaces of the second covering portion 2142 are from the end cap 211 in the thickness direction of the end cap 211.

In the present embodiment, the second surface 21423 is located on the same plane with the surface of the first cladding portion 2141 facing away from the end cap 211 and the surface of the third cladding portion 2143 facing away from the end cap 211. The first surface 21332 exceeds the surface of the first cladding 2141 facing away from the end cap 211 by 0.1-0.5 mm and the first surface 21332 also exceeds the surface of the third cladding 2143 facing away from the end cap 211 by 0.1-0.5 mm.

The distance that the second surface 21423 extends beyond the first surface 21332 along the thickness direction of the end cap 211 may be: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

By making the second surface 21423 protrude 0.1 to 0.5mm beyond the first surface 21332, it is possible to electrically connect the load to the output portion 2133 by facilitating wiring or welding of the bus bar to the output portion 2133, and to prevent a foolproof effect when connecting the output portion 2133 to the load, so that erroneous connection (i.e., connecting the connecting portion 2131 to the load) is not likely to occur, and also to prevent interference between the wire harness or the bus bar and the insulator 214 after wiring or welding of the bus bar to some extent. If the height of the second surface 21423 beyond the first surface 21332 is less than 0.1mm, the convenience of wiring or welding the bus bar on the output portion 2133 is not improved obviously, the fool-proof effect is poor, and the wire harness or bus bar is still easy to interfere with the insulating member 214 after the bus bar is wired or welded. If the height of the second surface 21423 exceeds the first surface 21332 by more than 0.5mm, the protruding height of the output portion 2133 is too high, and interference with other structures is likely to occur.

In some embodiments, insulator 214 is an injection molded part formed on a surface of connector 213.

The term "insulating member 214 is an injection molded member formed on the surface of the connecting member 213" may also be understood as that the connecting member 213 is injection molded with the insulating member 214, so that the insulating member 214 is coated on the connecting member 213. It should be emphasized that the connecting member 213 is made of a conductive material.

The insulating piece 214 is injection molded on the surface of the connecting piece 213, so that the insulating piece 214 can be attached to the surface of the connecting piece 213, and the coating effect on the connecting piece 213 is good. Meanwhile, the insulation member 214 isolates the fusing part 2132 from the outside, so that less or no air exists between the fusing part 2132 and the insulation member 214, and thus, when the fusing part 2132 fuses, the burning is not easy to occur due to the lack of air, the end cover assembly 21 is not easy to cause fire, and the safety is high.

In some embodiments, the output portion 2133, the connection portion 2131, and the fuse portion 2132 are integrally formed.

The output portion 2133, the connecting portion 2131 and the fusing portion 2132 are integrally formed, so that the strength of the connection of the three is improved. In addition, the output portion 2133, the connecting portion 2131 and the fusing portion 2132 are integrally molded, which reduces the number of steps and the manufacturing cost as compared with welding.

In some embodiments, the fusing portion 2132 is formed by forming a groove or a through hole in the connecting piece 213.

Referring to fig. 6, in some embodiments, the fusing portion 2132 is formed by forming a groove on the connecting piece 213. Here, the groove is formed around the circumference of the link 213 so as to be thinned around the circumference of the link 213, thereby forming the fusing part 2132.

Referring to fig. 16, fig. 16 is a schematic structural diagram of a connecting member 213 according to still another embodiment of the application. In still other embodiments, the fusing part 2132 is formed by forming two through holes on two sides of the connecting piece 213. The two through holes are formed at the edge of the connecting member 213, and can be regarded as two notches formed at the edge of the connecting member 213.

Referring to fig. 17, fig. 17 is a schematic structural diagram of a connecting member 213 (with two through holes to form a fusing part 2132) according to some embodiments of the present application. In some embodiments, the fusing part 2132 is formed by forming two through holes in the middle of the connecting piece 213 to be thinner. In this embodiment, two through holes are formed at intervals in the middle of the connection member 213, and three fusing parts 2132 are formed on the connection member 213 at intervals.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a connecting member 213 (with a through hole formed therein to form a fusing portion 2132) according to some embodiments of the present application. In some embodiments, the fusing part 2132 is formed by forming a through hole in the middle of the connecting piece 213 to be thinner. In this embodiment, a through hole is opened in the middle of the connection member 213, and two fusing parts 2132 are formed on the connection member 213 to be spaced apart.

Referring to fig. 19, fig. 19 is a schematic structural diagram of a connecting member 213 (a fuse portion 2132 formed with grooves) according to some embodiments of the present application. In some embodiments, the fusing portion 2132 is formed by forming two grooves on the connecting piece 213. Here, two grooves are respectively formed on the surface of the connecting member 213 facing the end cap 211 and the surface facing away from the end cap 211, so that the connecting member 213 is thinned, thereby forming the fusing part 2132.

The connecting member 213 is formed with a groove or a through hole for thinning, and the thinned portion is larger in resistance, so that the thinned portion is larger in heat and easier to fuse when the connecting member 213 passes current, thereby forming the fusing portion 2132.

The embodiment of the application also provides a battery cell 20, and the battery cell 20 comprises an electrode assembly 22, a shell 23 and the end cover assembly 21. The case 23 has an open-ended receiving space for receiving the electrode assembly 22. An end cap 211 is connected to the housing 23 and closes the opening.

The embodiment of the application also provides a battery 100, wherein the battery 100 comprises the case 10 and the battery cell 20, and the battery cell 20 is accommodated in the case 10.

The embodiment of the application also provides electric equipment, which comprises the battery 100.

According to some embodiments of the application, please refer to fig. 4-15.

The embodiment of the application provides an end cover assembly 21, wherein the end cover assembly 21 is used for a battery cell 20, and the battery cell 20 comprises a shell 23. The end cap assembly 21 includes an end cap 211, an electrode terminal 212, and a connecting member 213, wherein the end cap 211 is used for closing the opening of the housing 23, the electrode terminal 212 is disposed on the end cap 211, and the connecting member 213 is located on one side of the end cap 211 facing away from the housing 23. The connection member 213 includes a connection portion 2131, an output portion 2133, and a fusing portion 2132, the connection portion 2131 being connected to the electrode terminal 212; the output portion 2133 is for outputting or inputting electric energy of the battery cell 20. The fusing portion 2132 is connected to the connecting portion 2131 and the output portion 2133. The end cap assembly 21 includes an insulator 214, the insulator 214 at least partially surrounding the fuse portion 2132. The insulator 214 includes a first covering portion 2141, a second covering portion 2142, and a third covering portion 2143, which are sequentially connected, wherein the first covering portion 2141 covers the fusing portion 2132, the second covering portion 2142 covers the connecting portion 2131, and the third covering portion 2143 covers the output portion 2133. The end cap 211 is provided with a recess 2111, and the first cladding portion 2141, the second cladding portion 2142, and the third cladding portion 2143 are each accommodated in the recess 2111.

The end cap 211 partially protrudes in the thickness direction of the end cap 211 to form a protrusion 2113, the first coating portion 2141 is provided on the protrusion 2113, and at least a part of the third coating portion 2143 is accommodated in the recess 2111. The output portion 2133 includes a first connection segment 21333, an output segment 21334, and a second connection segment 21335, the first connection segment 21333 being connected to the fuse portion 2132; the output section 21334 is used for outputting or inputting electric energy of the battery cell 20; the second connecting section 21335 connects the first connecting section 21333 and the output section 21334, the output portion 2133 is bent at the second connecting section 21335, and the first connecting section 21333 and the output section 21334 extend in opposite directions at both ends of the second connecting section 21335; the portion of the third covering portion 2143 covering the output section 21334 is accommodated in the recess 2111.

In the thickness direction of the end cap 211, the output portion 2133 has a first surface 21332 facing away from the end cap 211, the second coating portion 2142 has a second surface 21423 facing away from the end cap 211, and the second surface 21423 extends 0.1 to 0.5mm beyond the first surface 21332.

The end cover assembly 21 is provided with the connecting piece 213 at one side of the end cover 211, which is far away from the shell 23, and the connecting part 2131 of the connecting piece 213 is connected with the electrode terminal 212, so that the tightness between the electrode terminal 212 and the end cover 211 is not affected, and the sealing difficulty is not increased. The connection portion 2131 and the output portion 2133 are connected by a fuse portion 2132, and when the current passing through the fuse portion 2132 is excessive, the fuse portion 2132 automatically fuses, and the connection portion 2131 and the output portion 2133 are disconnected to protect the device. In addition, since the fusing part 2132 is positioned at the side of the end cover 211 facing away from the case 23, it will not contact with the electrolyte after fusing, and will not ignite the electrolyte, thus being safer. The insulating material 214 is at least partially wrapped around the fusing portion 2132, so that when the fusing portion 2132 receives an external force, the external force can be transmitted to the insulating material 214 to disperse the external force, thereby reducing the possibility that the fusing portion 2132 is damaged by the external force. On the other hand, the insulating material 214 is at least partially covered on the fusing part 2132, so that the contact area between the fusing part 2132 and the air is reduced, and a certain flame retardant effect can be achieved when the fusing part 2132 is fused. In addition, the insulator 214 may be made of a flame retardant material to provide better flame retardance.

The first wrapping portion 2141 wraps the fused portion 2132, thereby improving the strength of the fused portion 2132, reducing the possibility that the fused portion 2132 is damaged by external force, and providing flame retardant effect when the fused portion 2132 is fused. The second coating portion 2142 coats the connection portion 2131, thereby insulating the connection portion 2131 from the end cap 211, and preventing the connection portion 2131 from coming into contact with the end cap 211 to cause a short circuit. By wrapping the output portion 2133 with the third wrapping portion 2143, the output portion 2133 is insulated from the end cap 211, thereby preventing the output portion 2133 from coming into contact with the end cap 211 and shorting. Further, since the connection portion 2131 is covered with the second covering portion 2142, and the output portion 2133 is covered with the third covering portion 2143, erroneous connection (i.e., connection of the connection portion 2131 to a load) is less likely to occur when the output portion 2133 is connected to the load. Further, the first, second and third coating portions 2141, 2142, 2143 are connected in order, and the integrity is good, so that the connection portion 2131, the fusing portion 2132 and the output portion 2133 can be protected, and the connection element 213 is not easily damaged by external force. The first cladding portion 2141, the second cladding portion 2142 and the third cladding portion 2143 are all accommodated in the recess 2111, so that the positioning effect of the insulating member 214 is good, the relative positions of the insulating member 214 and the end cover 211 are not easy to change, and the insulating member 214 can perform a good insulating function.

The part of the end cap 211 protrudes in the thickness direction thereof to form a protrusion 2113, and a side of the end cap 211 opposite to the protrusion 2113 in the thickness direction thereof is correspondingly formed with a recess space capable of accommodating the components inside the battery cell 20, which is advantageous in improving the energy density of the battery cell 20. The first wrapping portion 2141 is provided on the protrusion 2113, so that the fused portion 2132 wrapped by the first wrapping portion 2141 is also located on the protrusion 2113, and the fused portion 2132 does not need to be bent, which is advantageous in ensuring the strength of the fused portion 2132. At least a portion of the third cladding 2143 is received in the recess 2111 to facilitate positioning of the insulator 214. By forming the second connecting segment 21335 to be bent such that there is a drop in the first connecting segment 21333 and the output segment 21334 in the thickness direction of the end cap 211, the output segment 21334 facilitates the connection of the first connecting segment 21333 to the fusing portion 2132 and the output of the electrical energy of the battery cell 20. The third covering portion 2143 covers a portion of the output section 21334 and is received in the recess 2111 to facilitate positioning of the insulator 214 and prevent the insulator 214 from being displaced and failing.

The above description is only of the preferred embodiments 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

An end cap assembly for a battery cell, the battery cell comprising a housing, wherein the end cap assembly comprises:

an end cap for closing the opening of the housing;

an electrode terminal provided at the end cap;

The connecting piece is located the end cover deviates from the side of casing, the connecting piece includes:

A connection part connected to the electrode terminal;

An output part for outputting or inputting the electric energy of the battery cell;

and a fusing part connected with the connecting part and the output part.
The end cap assembly of claim 1, wherein the end cap assembly includes an insulator at least partially surrounding the fuse portion.
The end cap assembly of claim 2, wherein the insulator is at least partially located between the end cap and the connector to insulate the connector from the end cap.
The end cap assembly of claim 2, wherein the end cap has a recess therein, at least a portion of the insulator being in locating engagement with the recess.
The end cap assembly of claim 2, wherein the insulator comprises a first cladding portion, a second cladding portion, and a third cladding portion connected in sequence, the first cladding portion cladding the fuse portion, the second cladding portion cladding the connecting portion, and the third cladding portion cladding the output portion.
The end cap assembly of claim 5, wherein the end cap has a recess therein, at least one of the first cladding, the second cladding, and the third cladding being received in the recess.
The end cap assembly of claim 6, wherein the first cladding, the second cladding, and the third cladding are each received in the recess.
The end cap assembly of claim 6, wherein the end cap partially protrudes in a thickness direction of the end cap to form a protrusion, the first cladding is disposed on the protrusion, and at least a portion of the third cladding is received in the recess.
The end cap assembly of claim 8, wherein the output portion comprises:

A first connecting section connected to the fusing part;

an output section for outputting or inputting electric energy of the battery cell;

The second connecting section is connected with the first connecting section and the output section, the output part is bent at the second connecting section, and the first connecting section and the output section extend along opposite directions at two ends of the second connecting section;

the third coating part coats the output section and is partially accommodated in the concave part.
The cap assembly according to claim 5, wherein the connection part has a mounting hole to which the electrode terminal is mounted, and the second sheathing part is provided with a first escape hole at a position corresponding to the mounting hole at a side facing away from the cap.
The end cap assembly of claim 10, wherein the first relief aperture has a diameter of 10-15 mm.
The end cap assembly of claim 5, wherein the third cladding portion is provided with a second relief hole on a side facing away from the end cap, and the output portion forms a connection region exposed to the outside at a position corresponding to the second relief hole.
The end cap assembly of claim 12, wherein the connection region is provided with a projection that is at least partially received within the second relief aperture.
The end cap assembly of claim 5, wherein the output portion has a first surface facing away from the end cap and the second cladding portion has a second surface facing away from the end cap, the second surface being 0.1-0.5 mm beyond the first surface, in a thickness direction of the end cap.
The end cap assembly of any one of claims 5-13, wherein the insulator is an injection molded part molded to a surface of the connector.
The end cap assembly of any one of claims 1-14, wherein the output portion, the connecting portion, and the fuse portion are integrally formed.
The end cap assembly of claim 1, wherein the fusing part is formed by forming a groove or a through hole on the connecting member in a thinned manner.
A battery cell, comprising:

An electrode assembly;

a case having an accommodation space with one end open for accommodating the electrode assembly;

The end cap assembly of any one of claims 1-17, said end cap being connected to said housing and closing said opening.
A battery, comprising:

A case;

The battery cell of claim 18, wherein the battery cell is housed within the case.
A powered device comprising the battery of claim 19.