CN216085077U

CN216085077U - End cover assembly for battery cell, battery and electric device

Info

Publication number: CN216085077U
Application number: CN202122573333.1U
Authority: CN
Inventors: 林蹬华; 陈新祥; 郭志君; 郑于炼; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-03-18
Anticipated expiration: 2031-10-25

Abstract

The embodiment of the application provides an end cover assembly, a single battery, a battery and a power consumption device for a single battery, and can improve the assembly success rate of the single battery. This an end cover subassembly for battery cell includes: the end cover is provided with an electrode leading-out hole and a first positioning part, and the electrode leading-out hole and the first positioning part are arranged on a plane parallel to the radial direction of the electrode leading-out hole in a staggered mode; the first insulating piece is arranged on one side of the end cover facing the interior of the battery cell and used for spacing the end cover and the electrode assembly in the interior of the battery cell; the side, facing the end cover, of the first insulating part is provided with a second positioning part, and the second positioning part and the first positioning part are matched with each other to limit the relative position of the first insulating part and the end cover.

Description

End cover assembly for battery cell, battery and electric device

Technical Field

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

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry. Under such circumstances, electric vehicles are an important component of sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the case of electric vehicles, battery technology is an important factor in the development thereof.

With the development of society, the requirement of consumers on the assembly precision of battery cells in batteries is higher and higher. Therefore, how to improve the assembly accuracy of the battery cells is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an end cover assembly, single battery, battery and power consumption device for single battery, can improve the single assembly precision of battery.

In a first aspect, there is provided an end cap assembly for a battery cell, comprising: the end cover is provided with an electrode leading-out hole and a first positioning part, and the electrode leading-out hole and the first positioning part are arranged on a plane parallel to the radial direction of the electrode leading-out hole in a staggered mode; the first insulating piece is arranged on one side of the end cover facing the interior of the battery cell and used for spacing the end cover and the electrode assembly in the interior of the battery cell; the side, facing the end cover, of the first insulating part is provided with a second positioning part, and the second positioning part and the first positioning part are matched with each other to limit the relative position of the first insulating part and the end cover.

Above-mentioned technical scheme, owing to set up on the end cover and draw out the first location portion that the hole dislocation set was put with the electrode to be provided with the second location portion of mutually supporting with first location portion on first insulating part, like this, can realize the accurate positioning between end cover and the first insulating part when assembling the end cover subassembly through mutually supporting of first location portion and second location portion, avoided the easy problem of misplacing of end cover and first insulating part in the assembling process, thereby effectively improved the free assembly precision of battery. Further, under the condition of improving the assembly precision of the battery cells, the electrode terminals can be accurately assembled on the end cover assembly, so that the problem that the leakage of the battery cells is caused due to the poor sealing performance of the electrode terminals is avoided, and the safety performance of the battery can be further improved.

In some embodiments, the first positioning portion is a boss protruding toward the first insulating member, and the second positioning portion is a groove engaged with the boss.

Above-mentioned technical scheme, on the one hand, set up first location portion into the outstanding boss of orientation first insulating part to set up second location portion into with boss complex recess, avoided on the axial direction parallel with the electrode lead-out hole, additionally increased the height that highly corresponds with the boss in the end cover subassembly, make when improving the assembly precision, still reduced the free space of battery that the end cover subassembly occupy, effectively improved the space utilization of end cover subassembly. On the other hand, in some embodiments, the first positioning portion and the second positioning portion are respectively provided as a boss and a groove, so that the positioning of the end cap assembly is realized in the simplest manner.

In some embodiments, a side of the first positioning portion remote from the first insulating member is recessed to form a recess.

In the above solution, the side of the first positioning portion away from the first insulating member is recessed to form the recess, so that on one hand, the recess is convenient to process; on the other hand, the weight of the entire battery cell can be reduced, and the energy density can be improved.

In some embodiments, a side of the first positioning portion away from the first insulating member is a plane.

In some embodiments, the first insulator is provided with a reinforcing rib, and the reinforcing rib is recessed to form the second positioning portion.

Above-mentioned technical scheme sets up the strengthening rib on first insulating part, on the one hand, has increased first insulating part's intensity, and on the other hand, through the strengthening rib invagination formation second location portion, has reduced first insulating part's weight, and then has reduced the holistic weight of battery, has improved energy density.

In some embodiments, a protruding portion is provided on a surface of the first insulating member away from the end cap at a position corresponding to the second positioning portion.

In some embodiments, the projection is spaced apart from the electrode lead-out hole.

In some embodiments, the end cap assembly further comprises: an electrode terminal, the electrode lead-out hole for receiving the electrode terminal; a connection member for electrically connecting the electrode terminal and the electrode assembly; wherein the connecting member is in contact with the boss.

In some embodiments, a side of the connecting member facing the end cap abuts against the boss.

In some embodiments, the second positioning portion is a boss protruding toward the end cap, and the first positioning portion is a groove engaged with the boss.

Above-mentioned technical scheme sets up first location portion and second location portion into recess and boss respectively, realizes simply, has not only realized the location to the end cover subassembly, has simplified the production technology of end cover subassembly moreover greatly.

In some embodiments, the end cap includes two electrode extraction apertures, the first positioning portion being disposed between the two electrode extraction apertures.

Above-mentioned technical scheme is through setting up first positioning portion between two electrode lead-out holes, and the distance between first positioning portion and two electrode lead-out holes is relatively nearer, can improve positioning accuracy greatly.

In some embodiments, the end cap assembly further comprises: two electrode terminals, one of the two electrode lead-out holes for receiving one of the two electrode terminals, and the other of the two electrode lead-out holes for receiving the other of the two electrode terminals; wherein the first positioning portion is disposed between the two electrode terminals.

In some embodiments, in a direction along a connection line of the two electrode lead-out holes, a size of the first positioning portion is smaller than or equal to a distance between the two electrode lead-out holes.

In some embodiments, in a direction perpendicular to a direction connecting the two electrode lead-out holes, a size of the first positioning portion is smaller than or equal to a distance between the two electrode lead-out holes.

In some embodiments, the first positioning portion and the second positioning portion are fitted with a clearance fit.

Above-mentioned technical scheme sets up the cooperation mode of first location portion and second location portion into clearance fit, can effectively guarantee to assemble successfully between first location portion and the second location portion.

In some embodiments, the clearance fit is in the range of 0mm to 0.1 mm.

In some embodiments, the end cap is a first wall of the battery cell, the first wall being the largest area of all walls of the battery cell.

According to the technical scheme, when the end cover is arranged as the wall with the largest area in all the walls in the battery cells, the area of the largest wall is large, so that the end cover and the first insulating piece are difficult to align in the assembling process of the end cover assembly. Through set up first location portion on the end cover and set up on first insulating part with first location portion complex second location portion, can effectively solve the problem that end cover and first insulating part are difficult to aim at to improve the free assembly precision of battery.

In some embodiments, the first detent is polygonal in shape on the end cap surface.

In some embodiments, the first detent is rectangular in shape on the end cap surface.

In some embodiments, the shape of the second positioning portion corresponds to the shape of the first positioning portion.

In some embodiments, the end cap assembly further comprises: and the sealing ring is arranged on the electrode leading-out hole and used for sealing the electrode leading-out hole.

In some embodiments, the material of the end cap is aluminum or steel.

In a second aspect, a battery cell is provided, including: a housing having an opening; an electrode assembly housed within the case; the end cap assembly of the first aspect, covering the opening to cover the electrode assembly in the case.

In some embodiments, the number of the electrode assemblies is plural.

In some embodiments, the electrode assembly is provided with a positive electrode tab, the number of the positive electrode tabs is plural, and the plural positive electrode tabs are stacked together.

In some embodiments, the electrode assembly is further provided with a plurality of negative electrode tabs, and the plurality of negative electrode tabs are stacked together.

In some embodiments, the battery cell further includes: a pressure relief mechanism for actuating to relieve an internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a threshold.

In some embodiments, the pressure relief mechanism is a pressure sensitive pressure relief mechanism configured to rupture when an internal air pressure of a cell in which the pressure sensitive pressure relief mechanism is disposed reaches a threshold value.

In a third aspect, a battery is provided, including: the battery cell of the second aspect.

In some embodiments, the battery further comprises: the interior of the box body is of a hollow structure, and the single battery is accommodated in the box body; wherein the case comprises a first portion and a second portion that snap together to form the case with an enclosed chamber.

In a fourth aspect, there is provided an electrical device comprising: the battery cell of the second aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a battery disclosed in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of an end cap assembly according to an embodiment of the present disclosure;

FIG. 5 is a schematic cross-sectional view of an end cap assembly disclosed in an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of an end cap assembly disclosed in another embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of another end cap assembly disclosed in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a first insulating member according to an embodiment of the present application.

In the drawings, the drawings are not necessarily to scale.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

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 in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not 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 can be included in at least one embodiment of the specification. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other regular or irregular shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

Reference to a battery in embodiments 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, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. 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 pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. 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 fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be polypropylene (PP) or Polyethylene (PE). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

With the development of society, the requirement of consumers on the assembly precision of the battery cells is higher and higher. If the assembly precision is low, the problem of assembly dislocation between the structural members of the single batteries may occur in the assembly process, and the overall performance of the single batteries is further affected.

In some embodiments, the battery cell may further include an end cap assembly including an end cap and a first insulating member, in addition to the electrode assembly, wherein the end cap is provided with an electrode lead-out hole, and the first insulating member is provided with an opening corresponding to the electrode lead-out hole. When the battery cell is assembled, the electrode terminal needs to pass through the electrode lead-out hole and the open hole corresponding to the electrode lead-out hole. If the assembly precision of the battery monomer is low, the electrode leading-out hole is not aligned with the opening hole corresponding to the electrode leading-out hole, and therefore the electrode terminal can not be smoothly assembled on the end cover, or the position of the electrode terminal on the end cover assembly deviates, the electrode terminal is poor in compression of the sealing ring, the sealing performance of the sealing ring on the battery monomer is poor, the problem of leakage of the battery monomer is caused, and the like, and the safety performance of the battery is affected.

In view of this, the embodiment of the application provides an end cover assembly for a battery cell, can improve the assembly precision of the battery cell, and then improve the safety performance of the battery.

The technical scheme described in the embodiment of the application is suitable for various electric equipment using batteries.

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 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 and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of explanation, the following embodiments will be described by taking an electric device as an example of a vehicle.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1 instead of or in part of fuel or natural gas to provide driving power to the vehicle 1.

To meet different usage power requirements, the battery 10 may include a plurality of battery cells, for example, a plurality of cylindrical battery cells. The plurality of battery cells can be connected in series or in parallel or in series-parallel, and the series-parallel refers to the mixture of series connection and parallel connection. The battery may also be referred to as a battery pack. In some embodiments, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form the battery 10. That is, a plurality of battery cells may directly constitute the battery 10, or a battery module may be first constituted and then the battery 10 may be constituted.

For example, as shown in fig. 2, a schematic diagram of a battery 10 according to an embodiment of the present application is shown. The battery 10 may include a plurality of battery cells 20. Besides the battery cells, the battery 10 may further include a case (or called a cover), the inside of the case is a hollow structure, and the plurality of battery cells 20 may be accommodated in the case. As shown in fig. 2, the case may comprise two parts, herein referred to as a first part 111 and a second part 112, respectively, the first part 111 and the second part 112 snap together. The shape of the first and

second portions

111 and 112 may be determined according to the shape of a combination of a plurality of battery cells 20, and the first and

second portions

111 and 112 may each have one opening. For example, each of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped and only one surface of each may be an opening surface, the opening of the first portion 111 and the opening of the second portion 112 are oppositely disposed, and the first portion 111 and the second portion 112 are fastened to each other to form a box body having a closed chamber. The plurality of battery cells 20 are connected in parallel or in series-parallel combination and then placed in a box formed by buckling the first part 111 and the second part 112.

In some embodiments, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member (not shown in the drawings) for achieving electrical connection between the plurality of battery cells 20, such as parallel connection or series-parallel connection. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. In some embodiments, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the box body by the conductive mechanism. In some embodiments, the conductive mechanism may also belong to the bus member.

The number of the battery cells 20 may be set to any number according to different power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power.

For convenience of explanation, the following description will be given mainly taking the cylindrical battery cell 20 shown in fig. 2 as an example. However, it should be understood that the battery cell according to the embodiment of the present disclosure may be a square-shell battery cell or a blade battery cell, instead of a cylindrical battery cell.

Fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application. As shown in fig. 3, the battery cell 20 may include a case 210, an electrode assembly 220, and an end cap assembly 230. The housing 210 and the end cap assembly 230 form an outer shell or battery case, and the walls of the housing 210 and the end cap assembly 230 are referred to as the walls of the battery cell 20. The case 210 is determined according to the shape of the assembled one or more electrode assemblies 220. For example, the housing 210 may be a hollow cylinder as shown in fig. 3, or if the battery cell 20 is a blade type battery cell, the housing 210 may be a rectangular parallelepiped with a long length. And at least one face of the case 210 has an opening so that one or more electrode assemblies 220 are placed in the case 210. For example, when the housing 210 is a hollow cylinder, the end surface of the housing 210 is an open surface, i.e., the end surface has no wall body, so that the housing 210 communicates with the inside and the outside. As can be seen from fig. 3, the cylindrical battery cell has two rounded end surfaces between which is a cylindrical body, and the cylindrical body portion may include the electrode assembly 220. The end cap assembly 230 covers the opening and is coupled with the case 210 to form a closed cavity that prevents the electrode assembly 220. The case 210 is filled with an electrolyte, such as an electrolytic solution.

The end cap assembly 230 includes an end cap 231 and an electrode terminal 240, and the electrode terminal 240 may be disposed on the end cap 231. The end cap assembly 230 further includes a connection member, which may also be referred to as a current collecting member, for electrically connecting the electrode assembly 220 and the electrode terminal 240.

Each electrode assembly 220 may have two tabs, for example, a first tab and a second tab, which have opposite polarities. For example, when the first tab is a positive tab, the second tab is a negative tab. The first tabs of the one or more electrode assemblies 220 are connected to one electrode terminal by one connection member, and the second tabs of the one or more electrode assemblies 220 are connected to the other electrode terminal by another connection member.

In the battery cell 20, the electrode assembly 220 may be provided singly or in multiple numbers according to actual use requirements, and as shown in fig. 3, one electrode assembly 220 is disposed in the battery cell 20.

The battery cell 20 may further include a pressure relief mechanism. The pressure relief mechanism is used for actuation to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

The pressure relief mechanism may be any of various possible pressure relief structures, which are not limited in the embodiments of the present application. For example, the pressure relief mechanism may be a temperature-sensitive pressure relief mechanism configured to be capable of melting when the internal temperature of the battery cell 20 provided with the pressure relief mechanism reaches a threshold value; and/or, the pressure relief mechanism may be a pressure sensitive pressure relief mechanism configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism reaches a threshold value.

Fig. 4 shows a schematic structural diagram of an end cap assembly 230 disclosed in an embodiment of the present application. As can be seen in fig. 4, the end cap assembly 230 may include an end cap 231 and a first insulator 232. The end cap 231 is provided with an electrode lead-out hole 2311 and a first positioning portion 2312, and the electrode lead-out hole 2311 and the first positioning portion 2312 are arranged in a staggered manner on a radial plane parallel to the electrode lead-out hole 2311.

The first insulating member 232 is disposed at one side of the end cap 231 facing the inside of the battery cell 20 for spacing the end cap 231 from the electrode assembly 220 inside the battery cell 20. The side of the first insulating member 232 facing the end cap 231 is provided with a second positioning portion 2321, and the second positioning portion 2321 and the first positioning portion 2312 cooperate with each other to limit the relative position of the first insulating member 232 and the end cap 231.

Here, the mutual cooperation of the second positioning portion 2321 and the first positioning portion 2312 can be understood as follows: in the axial direction of the electrode lead-out hole 2311, the position of the second positioning portion 2321 corresponds to the position of the first positioning portion 2312.

In some embodiments, the material of the end cap 231 may be a metal material, such as aluminum material, steel material, etc.

When the battery cell is a cylindrical battery cell, the shape of the end cap 231 may be a circle as shown in fig. 4; when the battery cell is a blade battery, the shape of the end cap 231 may be a polygon, such as a rectangle. In the case where the cells are blade cells, the thickness of the end cap 231 may be very thin. The battery monomer is set as the blade type battery monomer, and the energy density of the battery monomer can be improved in the limited space of the battery.

The electrode lead-out hole 2311 may be used to receive the electrode terminal 240. Illustratively, the shape of the electrode lead-out hole 2311 may be, but is not limited to, circular, triangular, square, and the like.

In some embodiments, the first insulating member 232 may be provided with an opening 2323 corresponding to the electrode lead-out hole 2311, so that the electrode terminal 240 may pass through the electrode lead-out hole 2311 and the opening 2323 and finally be protrudingly provided on the surface of the end cap 231. It should be understood that the number of the electrode lead-out holes 2311 and the openings 2323 is not particularly limited in the embodiments of the present application. For example, as shown in fig. 4, the number of the electrode drawing holes 2311 and the number of the openings 2323 may be 2, respectively.

According to the technical scheme, the end cover 231 is provided with the first positioning part 2312 which is arranged in a staggered manner with the electrode lead-out hole 2311, and the first insulating part 232 is provided with the second positioning part 2321 which is matched with the first positioning part 2312, so that the first positioning part 2312 and the second positioning part 2321 are matched with each other, so that the end cover 231 and the first insulating part 232 can be accurately positioned when the end cover assembly 230 is assembled, the problem that the end cover 231 and the first insulating part 232 are easy to be staggered in the assembling process is solved, and the assembling precision of the single battery 20 is effectively improved. Further, under the condition of improving the assembly accuracy of the battery cell 20, the electrode terminal 240 can be accurately assembled to the end cover assembly 230, so that the problem that the sealing performance of the battery cell is poor due to poor compression of the electrode terminal 240 on the sealing ring, and the leakage of the battery cell 20 is caused is solved, and the safety performance of the battery can be further improved.

In addition to end cap 231 and first insulator 232, end cap assembly 230 may also include a sealing ring 235, as shown in FIG. 4, for sealing electrode lead-out aperture 2311. Under the condition that the end cover assembly 230 is provided with the sealing ring 235, in the embodiment of the present application, by providing the first positioning portion 2312 and the second positioning portion 2321 that is matched with the first positioning portion 2312 on the end cover 231, when the single battery 20 receives a torsional force, the first positioning portion 2312 and the second positioning portion 2321 can bear the torsional force, and thus the problem that the sealing ring 235 is pulled by the torsional force to affect the sealing effect of the sealing ring 235 on the electrode lead-out hole 2311 is avoided.

As shown in fig. 4, the end cap assembly 230 may further include a rivet block 233 for fixing the electrode terminal 240 of the protruding end cap 231. In addition, the end cap assembly 230 may further include a connecting member 236, which has been described above and will not be described herein.

Fig. 5 is a schematic cross-sectional view of an end cap assembly 230 disclosed in an embodiment of the present application, and fig. 6 is a schematic cross-sectional view of an end cap assembly 230 disclosed in another embodiment of the present application. The end cap assembly 230 may also include a second insulator 234 for insulating the end cap 231 from the rivet block 233. Wherein, the second insulating member 234 is provided with a flange 2341, and the flange 2341 extends into the electrode lead-out hole 2311, so as to improve the assembly accuracy of the second insulating member 234 and the end cap 231.

The number of the electrode drawing holes 2311 is not limited in the present application. As can be seen in fig. 5 and 6, the end cap assembly 230 of fig. 5 includes two electrode lead out holes 2311, and the end cap assembly 230 of fig. 6 includes one electrode lead out hole 2311.

In some embodiments, as shown in fig. 5 and 6, the first positioning portion 2312 may be a boss protruding toward the first insulating member 232, and correspondingly, the second positioning portion 2321 may be a groove engaged with the boss.

This technical scheme, on the one hand, set up first location portion 2312 as the outstanding boss of orientation first insulating part 232 to set up second location portion 2321 as the recess with boss complex, avoided on the axial direction parallel with electrode lead-out hole 2311, additionally increased the height that corresponds with the boss height in end cover assembly 230, make when improving assembly accuracy, still reduced the battery monomer 20's that end cover assembly 230 occupy space utilization, effectively improved end cover assembly 230. On the other hand, in some embodiments, providing the first positioning portions 2312 and the second positioning portions 2321 as bosses and grooves, respectively, enables positioning of the end cap assembly 230 in the simplest manner.

Wherein, a side of the first positioning portion 2312 away from the first insulating member 232 may be recessed to form a recess 2313. For example, the recess 2312 may be formed by punching a side of the first positioning portion 2312 away from the first insulating member 232. One side of the first positioning portion 2312, which is far away from the first insulating member 232, is a concave portion 2312, so that on one hand, the concave portion 2312 is convenient to machine; on the other hand, the weight of the entire battery cell 20 can be reduced, and the energy density can be improved.

In some embodiments, a side of the first positioning portion 2312 away from the first insulating member 232 may also be a plane.

In other embodiments, as shown in fig. 7, the second positioning portion 2321 may be a boss protruding toward the end cap 231, and correspondingly, the first positioning portion 2312 may be a groove matching with the boss. The side of the first positioning portion 2312, which is far away from the first insulating member 232, is recessed to form a concave portion, so that on one hand, the concave portion is convenient to machine; on the other hand, the weight of the entire battery cell 20 can be reduced, and the energy density can be improved.

In some embodiments, when the end cap 231 includes two electrode lead-out holes 2311, the first positioning portion 2312 is disposed between the two electrode lead-out holes 2311. In other words, the first positioning portions 2312 are disposed between the two electrode terminals 240.

Here, the two electrode drawing holes 2311 may be electrode drawing holes corresponding to the same electrode of the battery cell 20. That is, the battery cell 20 may include at least four electrode lead-out holes 2311. Alternatively, the two electrode drawing holes 2311 may be electrode drawing holes corresponding to different electrodes of the battery cell 20. That is, the battery cell 20 may include at least two electrode lead-out holes 2311.

Since the first positioning portions 2312 are disposed between the two electrode lead-out holes 2311, the size of the first positioning portions 2312 is smaller than or equal to the distance between the two electrode lead-out holes 2311 in the radial direction of the two electrode lead-out holes 2311.

In the above technical solution, the first positioning portion 2312 is disposed between the two electrode lead-out holes 2311, and the distance between the first positioning portion 2312 and the two electrode lead-out holes 2311 is relatively short. In this way, the first positioning portions 2312 can be positioned with a greatly improved accuracy by engagement with the second positioning portions 2321.

In some embodiments, when the first positioning portion 2312 is a boss protruding toward the first insulating member 232, a surface of the first insulating member 232 facing the end cap 231 may be recessed to form the second positioning portion 2321. When the second positioning part 2321 is a boss protruding toward the end cap 231, one surface of the first insulating member 232 facing the end cap 231 may be convex to form the second positioning part 2321.

Alternatively, in another embodiment, as shown in fig. 8, the first insulating member 232 may be provided with a reinforcing rib 2322, and the reinforcing rib 2322 is recessed to form the second positioning portion 2321.

The number and shape of the reinforcing bars 2322 are not particularly limited in the embodiments of the present application. For example, the number of the reinforcing bars 2322 may be 2 as shown in fig. 8, and the 2 reinforcing bars 2322 may be perpendicular to each other. Of course, the 2 ribs 2322 may also be parallel to each other.

As an example, the ribs 2322 may be individually formed with the grooves. For example, when the first positioning portion 2312 is a boss, the thickness of the rib 2322 corresponding to the region of the first positioning portion 2312 may be smaller than the thickness of the other ribs 2322, so as to form a groove.

As another example, with continued reference to fig. 8, the stiffener 2322 may form a groove with at least a portion of the non-stiffener region of the first insulator 232.

Above-mentioned technical scheme sets up strengthening rib 2322 on first insulator 232, on the one hand, has increased first insulator 232's intensity, and on the other hand, forms second location portion 2321 through this strengthening rib 2322, has reduced first insulator 232's weight, and then has reduced the holistic weight of battery monomer 20, has improved energy density.

Regarding the shape of the first positioning portions 2312 and the second positioning portions 2321, in some embodiments, the shape of the first positioning portions 2312 on the surface of the end cap 231 may be polygonal. For example, the first detent 2312 may be rectangular in shape on the surface of the end cap 231.

The shape of the second positioning portions 2321 corresponds to the shape of the first positioning portions 2312. For example, when the shape of the first positioning portion 2312 on the surface of the end cap 231 is rectangular, the shape of the second positioning portion 2321 on the surface of the first insulating member 232 is also rectangular.

In some embodiments, the first positioning portion 2312 and the second positioning portion 2321 may be fitted in a clearance fit manner. The first positioning portion 2312 and the second positioning portion 2321 are in clearance fit, so that the first positioning portion 2312 and the second positioning portion 2321 can be assembled successfully.

Wherein a clearance fit refers to a fit having a clearance (including a minimum clearance equal to zero). At this time, the actual size of the hole is not smaller than the size of the shaft.

In the ideal case, a clearance fit of 0mm is used. However, in an actual process, the range of the gap between the first positioning portion 2312 and the second positioning portion 2321 may not be optimal. If the range of the gap between the first positioning portion 2312 and the second positioning portion 2321 is too large, the first positioning portion 2312 and the second positioning portion 2321 may not play a role of limiting the relative position of the first insulating member 232 and the end cap 231, and therefore, the gap adopted for the clearance fit is not greater than 0.1 mm. In summary, in the embodiment of the present application, the range of the gap used for the clearance fit may be 0mm to 0.1 mm.

In some embodiments, the end cap 231 may be a first wall of the battery cell 20, which is the largest area of all the walls of the battery cell 20. That is, the large face of the battery cell 20 is provided as the end cap 232.

Due to the large area, it is difficult to align the electrode lead-out holes 2311 of the end cap 232 with the openings 2323 of the first insulator 232 during assembly of the end cap assembly 230. Through setting up first location portion 2312 on end cover 231 and setting up the second location portion 2321 with first location portion 2312 complex on first insulating piece 232, can effectively solve the problem of being difficult to aim at between the trompil 2323 on the electrode lead-out hole 2311 on end cover 231 and the first insulating piece 232 to improve the assembly success rate of battery monomer 20, and further improve the security performance of battery.

In some embodiments, as the radius of the electrode terminal 240 is larger, the more current and voltage the battery cell 20 including the electrode terminal 240 can withstand. Accordingly, the end cap assembly 230 is disposed on the wall having the largest area of the battery cell 20, so that the radius of the electrode terminal 240 can be designed to be large enough, and the voltage and current that can be borne by the battery cell 20 are increased, thereby improving the performance of the battery cell 20.

Alternatively, the end cap 231 may be a second wall of the battery cell 20, which is the smallest area wall of all the walls of the battery cell 20. That is, the end cap assembly 230 may be located on an end face of the battery cell 20.

The embodiment of the application also provides a battery monomer. The battery cell may include a case, an electrode assembly, and an end cap assembly. The shell is provided with an opening, the electrode assembly is contained in the shell, and the end cover assembly covers the opening so as to cover the electrode assembly in the shell.

In some embodiments, the battery cells may be blade batteries.

The embodiment of the application also provides a battery, and the battery can comprise the battery cell in each embodiment. In some embodiments, the battery may further include other structures such as a box body and a bus member, which are not described herein.

The embodiment of the present application further provides an electric device, which may include the battery cell in the foregoing embodiments, where the battery cell is used to provide electric energy to the electric device.

In some embodiments, the powered device may be the vehicle 1, the watercraft, or the spacecraft of fig. 1.

According to some embodiments of the present application, referring to fig. 4-7, the present application provides an end cap assembly 230 for a battery cell, the end cap assembly 230 including an end cap 231 and a first insulating member 232. The end cap 231 is provided with an electrode lead-out hole 2311 and a first positioning portion 2312, and the electrode lead-out hole 2311 and the first positioning portion 2312 are arranged in a staggered manner on a radial plane parallel to the electrode lead-out hole 2311. The first insulating member 232 is disposed at one side of the end cap 231 facing the inside of the battery cell 20 for spacing the end cap 231 from the electrode assembly 220 inside the battery cell 20. The side of the first insulating member 232 facing the end cap 231 is provided with a second positioning portion 2321, and the second positioning portion 2321 and the first positioning portion 2312 cooperate with each other to limit the relative position of the first insulating member 232 and the end cap 231. The first positioning portion 2312 is a boss protruding toward the first insulating member 232, and the second positioning portion 2321 is a groove engaged with the boss. The first insulating member 232 is provided with a reinforcing rib 2322, and the reinforcing rib 2322 can be recessed to form a second positioning portion. The end cap 231 includes two electrode lead-out holes 2311, wherein the first positioning portion 2312 is disposed between the two electrode lead-out holes 2311.

Claims

1. An end cap assembly for a battery cell, comprising:

the end cover is provided with an electrode leading-out hole and a first positioning part, and the electrode leading-out hole and the first positioning part are arranged on a plane parallel to the radial direction of the electrode leading-out hole in a staggered mode;

the first insulating piece is arranged on one side of the end cover facing the interior of the battery cell and used for spacing the end cover and the electrode assembly in the interior of the battery cell;

the side, facing the end cover, of the first insulating part is provided with a second positioning part, and the second positioning part and the first positioning part are matched with each other to limit the relative position of the first insulating part and the end cover.

2. The end cap assembly of claim 1, wherein the first locating portion is a boss projecting toward the first insulator and the second locating portion is a groove that mates with the boss.

3. The end cap assembly of claim 2, wherein a side of the first locator portion remote from the first insulator is recessed to form a recess.

4. The end cap assembly of claim 2, wherein a side of the first locator portion distal from the first insulator is planar.

5. An end cap assembly according to any one of claims 2 to 4, wherein the first insulator is provided with a reinforcing rib thereon, the reinforcing rib being recessed to form the second locating portion.

6. An end cap assembly according to any one of claims 2 to 4, wherein a raised portion is provided on a surface of the first insulating member remote from the end cap at a position corresponding to the second locating portion.

7. The end cap assembly of claim 6, wherein the boss is spaced from the electrode lead-out aperture.

8. The end cap assembly of claim 7, further comprising:

an electrode terminal, the electrode lead-out hole for receiving the electrode terminal;

a connection member for electrically connecting the electrode terminal and the electrode assembly;

wherein the connecting member is in contact with the boss.

9. An end cap assembly according to claim 8, wherein a side of the connecting member facing the end cap abuts the boss.

10. An end cap assembly according to claim 1, wherein the second detent is a boss projecting towards the end cap and the first detent is a groove cooperating with the boss.

11. The end cap assembly of any one of claims 1-4, wherein the end cap includes two electrode lead-out apertures, the first positioning portion being disposed between the two electrode lead-out apertures.

12. The end cap assembly of claim 11, further comprising:

two electrode terminals, one of the two electrode lead-out holes for receiving one of the two electrode terminals, and the other of the two electrode lead-out holes for receiving the other of the two electrode terminals;

wherein the first positioning portion is disposed between the two electrode terminals.

13. The end cap assembly of claim 11, wherein a dimension of the first positioning portion in a direction along a line connecting the two electrode lead out holes is smaller than or equal to a distance between the two electrode lead out holes.

14. The end cap assembly of claim 11, wherein a dimension of the first positioning portion is smaller than or equal to a distance between the two electrode lead-out holes in a direction perpendicular to a direction of connection of the two electrode lead-out holes.

15. The end cap assembly of any of claims 1-4, wherein the first detent and the second detent mate in a clearance fit.

16. The end cap assembly of claim 15, wherein the clearance fit is provided in a range of 0mm to 0.1 mm.

17. An end cap assembly according to any one of claims 1 to 4, wherein the end cap is a first wall of the battery cell, the first wall being the largest area of all the walls of the battery cell.

18. The end cap assembly of any one of claims 1-4, wherein the first detent is polygonal in shape on the end cap surface.

19. The end cap assembly of claim 18, wherein the first detent is rectangular in shape on the end cap surface.

20. The end cap assembly of claim 18, wherein the shape of the second detent corresponds to the shape of the first detent.

21. The end cap assembly of any one of claims 1-4, further comprising:

and the sealing ring is arranged on the electrode leading-out hole and used for sealing the electrode leading-out hole.

22. An end cap assembly according to any one of claims 1 to 4 wherein the material of the end cap is aluminium or steel.

23. A battery cell, comprising:

a housing having an opening;

an electrode assembly housed within the case;

the end cap assembly of any one of claims 1 to 22, covering the opening to cap the electrode assembly in the case.

24. The battery cell as recited in claim 23 wherein the electrode assembly is plural in number.

25. The battery cell as recited in claim 23, wherein the electrode assembly is provided with a plurality of positive electrode tabs, and the plurality of positive electrode tabs are stacked together.

26. The battery cell as recited in claim 25, wherein the electrode assembly is further provided with a plurality of negative electrode tabs, and the plurality of negative electrode tabs are stacked together.

27. The battery cell of claim 23, further comprising:

a pressure relief mechanism for actuating to relieve an internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a threshold.

28. The battery cell of claim 27, wherein the pressure relief mechanism is a pressure sensitive pressure relief mechanism configured to rupture when an internal air pressure of the battery cell in which the pressure sensitive pressure relief mechanism is disposed reaches a threshold value.

29. A battery comprising the cell of claim 23.

30. The battery of claim 29, further comprising:

the interior of the box body is of a hollow structure, and the single battery is accommodated in the box body;

wherein the case comprises a first portion and a second portion that snap together to form the case with an enclosed chamber.

31. An electric device comprising the battery cell of claim 23.