CN216250920U

CN216250920U - Battery monomer, battery and consumer

Info

Publication number: CN216250920U
Application number: CN202122530563.XU
Authority: CN
Inventors: 方堃; 郭志君; 李英
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-04-08
Anticipated expiration: 2031-10-20

Abstract

The embodiment of the application provides a single battery, a battery and electric equipment, and belongs to the technical field of batteries. The battery cell includes a case, an electrode assembly, an end cap, and a current collecting member. The electrode assembly has tabs. The case has an opening for accommodating the electrode assembly. The end cover is used for covering the opening and is connected with the shell in a sealing mode. The current collecting component is positioned in the shell and used for connecting the pole lug and the shell so as to realize the electric connection of the pole lug and the shell. The inner side surface of the shell is convexly provided with a first limiting part, and the current collecting component is abutted to one side of the first limiting part facing the electrode assembly. The first limiting part has a limiting effect on the current collecting component, so that the current collecting component has a limiting effect on the movement of the electrode assembly, the displacement of the electrode assembly in the shell along the direction of the end cover is reduced, the risk that the electrode assembly is connected with the current collecting component and fails due to overlarge displacement is reduced, and the risk that the battery assembly is electrically connected with the shell and fails is reduced.

Description

Battery monomer, battery and consumer

Technical Field

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

Background

The lithium ion battery is a rechargeable battery and has the advantages of small volume, high energy density, high power density, multiple recycling times, long storage time and the like.

A battery cell generally includes a case for accommodating an electrode assembly and an electrolyte, and generates electric energy by movement of metal ions (e.g., lithium ions) between positive and negative electrode tabs of the electrode assembly. For a general battery cell, the electrode assembly needs to be electrically connected to the case such that the case serves as a positive output electrode or a negative output electrode of the battery cell. Currently, the electrical connection between the electrode assembly and the case is prone to failure.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a single battery, a battery and electric equipment, and can reduce the risk of electric connection failure of a battery assembly and a shell.

In a first aspect, an embodiment of the present application provides a battery cell, including: an electrode assembly having tabs; a case having an opening for accommodating the electrode assembly; the end cover is used for covering the opening and is connected with the shell in a sealing way; a current collecting member received in the case and located on a side of the electrode assembly facing the end cap, the current collecting member being used to connect the tab and the case to electrically connect the tab and the case; the first limiting part is used for limiting the end cover to move towards the direction close to the electrode assembly, and the current collecting component abuts against one side, facing the electrode assembly, of the first limiting part.

In the technical scheme, the lug is electrically connected with the shell through the current collecting component, and the current collecting component is abutted against one side of the first limiting part facing to the electrode assembly, so that good overcurrent between the current collecting component and the shell is ensured. The first limiting part not only has a limiting effect on the end cover, but also has a limiting effect on the current collecting component, so that the current collecting component has a limiting effect on the movement of the electrode assembly, the displacement of the electrode assembly in the shell along the direction of the end cover is reduced, the risk that the electrode assembly is connected with the current collecting component and fails due to overlarge displacement is reduced, and the risk that the battery assembly is electrically connected with the shell and fails is reduced.

In some embodiments, the current collecting member includes: the body part is positioned on one side, facing the electrode assembly, of the first limiting part and is used for connecting the lug; the elastic part is connected with the body part and used for abutting against the first limiting part along the direction departing from the electrode assembly.

Among the above-mentioned technical scheme, the direction butt in first spacing portion of elastic component along deviating from electrode subassembly is followed to the elastic component, and the elastic component has elastic deformation ability, and the elastic component can take place elastic deformation according to the distance change between this somatic part and the first spacing portion for the elastic component plays fine cushioning effect to electrode subassembly, reduces because of electrode subassembly and the impaired risk of mass flow component rigid impact. In addition, the elastic part always keeps in a butting state against the first limiting part when the battery pack moves in the shell due to the vibration of the battery cells, and the risk of electric connection failure of the current collecting component and the shell due to the vibration of the battery cells is reduced.

In some embodiments, the elastic portion is an elastic sheet bent and arranged on the body portion.

Among the above-mentioned technical scheme, the elastic part is for buckling the shell fragment of arranging in this somatic part, simple structure, and easily shaping has fine deformability.

In some embodiments, the elastic portion includes: the first bending part is used for abutting against the first limiting part; a second bent portion for connecting the first bent portion and the body portion; in the thickness direction of the end cover, a part of the body part opposite to the first bending part is arranged with a gap from the first bending part.

Among the above-mentioned technical scheme, the elastic part includes interconnect's first kink and second kink, then can form first kink and second kink through the mode of buckling, and the shaping is simple. The part of the body part opposite to the first bending part is arranged at a gap with the first bending part, and the gap between the body part and the first bending part can provide a deformation space for the first bending part, so that the first bending part not only has the capability of deforming towards the direction departing from the body part, but also has the capability of deforming towards the direction close to the body part, so that the elastic part can play a good role in buffering the electrode assembly when the electrode assembly moves towards the direction close to the end cover, and the risk of damage caused by rigid impact of the electrode assembly and the current collecting component is reduced.

In some embodiments, the battery cell further includes an elastic layer supported between the body portion and the first bending portion.

Among the above-mentioned technical scheme, the elastic layer supports between this somatic part and first kink, and the elastic layer can play fine elastic support effect to first kink, strengthens the cushioning effect of elasticity portion to electrode subassembly, improves the ability that first kink is warp to the direction that is close to this somatic part after the deformation resumes.

In some embodiments, the second bending portion is connected to an edge of the main body portion, and the first bending portion is bent relative to the second bending portion in a direction close to the main body portion.

In the above technical solution, the second bending portion is connected to the edge of the body portion, so that the second bending portion has a good capability of deforming relative to the body portion, and the first bending portion is bent relative to the second bending portion toward the direction close to the body portion, so that the first bending portion has a good capability of deforming relative to the second bending portion, and thus the entire elastic portion has a good capability of deforming. In addition, because the second bent part is connected to the edge of the body part, the second bent part is closer to the inner side surface of the shell, more parts of the first bent part can be abutted against the first limiting part, the contact area between the first bent part and the first limiting part is increased, and the flow area between the current collecting component and the shell is increased.

In some embodiments, the body portion has an outer surface facing the end cap, the outer surface being provided with a first receiving portion for receiving at least a portion of the resilient portion.

Among the above-mentioned technical scheme, the surface of this somatic part is equipped with first portion of holding, and first portion of holding can provide accommodation space for the elastic component to reduce the size of elastic component protrusion in the surface of this somatic part, reduce the inner space that the elastic component occupy the casing, vacate more spaces for electrode subassembly, be favorable to promoting the free energy density of battery.

In some embodiments, the resilient portion has an abutment surface facing the end cap, the abutment surface being for abutment with the first stop portion, the abutment surface being flush with the outer surface.

Among the above-mentioned technical scheme, support and lean on the face and the surface parallel and level of this somatic part for the surface of this somatic part also can support by in first spacing portion, thereby has increased the area of contact of collecting flow component and first spacing portion, and then increase the area of overflowing between collecting flow component and the casing.

In some embodiments, an area of the body portion where the first receiving portion is provided with a through hole.

Among the above-mentioned technical scheme, being equipped with the through-hole on the somatic part, the emission that the inside this somatic part of battery lies in one side of this somatic part towards electrode subassembly can flow to this somatic part one side towards the end cover through the through-hole, is favorable to inside emission to the battery monomer outside when battery monomer thermal runaway, improves battery monomer's security.

In some embodiments, the body portion is provided with a plurality of the elastic portions spaced apart along a circumferential direction of the body portion.

In the technical scheme, the plurality of elastic parts distributed at intervals along the circumferential direction of the body part can be abutted against the first limiting part, so that the contact area between the current collecting component and the first limiting part is increased, the flow area between the current collecting component and the shell is increased, and large-area flow is realized. In addition, the elastic parts distributed at intervals along the circumferential direction of the body part can play a role in buffering the electrode assembly, and the risk that the electrode assembly is damaged due to impact is further reduced.

In some embodiments, the body portion has a plurality of circumferentially spaced weld zones for welding with the tab, and at least one elastic portion is disposed between two adjacent weld zones in the circumferential direction of the body portion.

In the technical scheme, at least one elastic part is arranged between two adjacent welding areas in the circumferential direction of the body part, so that the welding areas, which are welded with the tabs, of the elastic parts and the body part are arranged in a staggered mode in the circumferential direction of the body part, the welding marks formed by welding the welding areas and the tabs are not easily influenced by the elastic parts, the size of the welding marks in the radial direction of the current collecting component is larger as much as possible, the risk of polarization of the electrode assembly is reduced, and the service life of a single battery is prolonged.

In some embodiments, the body portion has an inner surface facing away from the end cap, the inner surface being provided with a second receiving portion in the weld region for receiving at least a portion of the tab.

Among the above-mentioned technical scheme, the internal surface of this somatic part is provided with the second portion of accomodating that is located the weld zone, and the second portion of accomodating can hold utmost point ear at least partly to reduce utmost point ear and occupy the inner space of casing, vacate more spaces for electrode subassembly's main part, be favorable to promoting battery monomer's energy density.

In some embodiments, the current collecting member includes: the body part is positioned on one side, facing the electrode assembly, of the first limiting part and is used for connecting the lug; and the hanging and buckling part is connected with the body part and is used for being matched with the first limiting part in a hanging and buckling mode so as to limit the body part to move towards the direction close to or far away from the end cover.

Among the above-mentioned technical scheme, the portion of buckling and the first spacing portion of the mass flow component are hung and are buckled the cooperation, can restrict the body and remove to the direction of being close to or keeping away from the end cover, can keep the close contact of mass flow component and first spacing portion all the time, have strengthened the stability that mass flow component and casing are connected electrically, guarantee the area of crossing current between mass flow component and the casing.

In some embodiments, the hanging portion comprises: the first connecting part is connected with the body part and is used for abutting against one side, facing the first limiting part, of the electrode assembly; the second connecting part is abutted to one side, away from the electrode assembly, of the first limiting part; a third connecting portion for connecting the first connecting portion and the second connecting portion.

In the above technical scheme, the first connecting portion and the second connecting portion of the hanging buckle portion respectively abut against two sides of the first limiting portion, so that the hanging buckle portion and the first limiting portion have a larger contact area, and the flow area between the current collecting component and the shell is increased.

In some embodiments, the first connecting portion, the third connecting portion and the second connecting portion are connected in sequence and jointly define a limiting groove, and the limiting groove is used for accommodating at least a part of the first limiting portion. The hanging buckle part with the structure has simple structure and is easy to form.

In some embodiments, the battery cell further includes: and the conducting layer is used for connecting the first limiting part and the third connecting part.

In the technical scheme, the first limiting part and the third connecting part are connected through the conducting layer, so that the first limiting part is electrically connected with the third connecting part, and the flow area between the current collecting component and the shell is further increased.

In some embodiments, the first position-limiting portion is an annular structure extending along the circumferential direction of the housing.

Among the above-mentioned technical scheme, first spacing portion is loop configuration, easily make by shaping, and first spacing portion whole week all can play the restriction effect to the end cover, has guaranteed the spacing ability of first spacing portion to end cover and mass flow component.

In some embodiments, a roller groove is formed in the outer side surface of the housing corresponding to the first limiting portion.

Among the above-mentioned technical scheme, the lateral surface of casing is provided with the roller groove, and at the in-process in shaping roller groove, the casing will form first spacing portion in the position corresponding with the roller groove to with the restriction of mass flow component and electrode subassembly in the casing, the shaping of first spacing portion is simple, makes the free equipment of battery simpler, has fine economic nature.

In some embodiments, the housing has a second limiting portion, and at least a part of the end cap is located between the first limiting portion and the second limiting portion in the thickness direction of the end cap, and the first limiting portion and the second limiting portion are configured to jointly limit the movement of the end cap in the thickness direction of the end cap.

Among the above-mentioned technical scheme, the removal of end cover in the thickness direction of end cover can be restricted jointly with first spacing portion to the spacing portion of second for the unable casing of relative removal of end cover guarantees the fastness after end cover and casing are connected.

In some embodiments, the battery cell further includes: and the sealing element is used for sealing the end cover and the shell, and the sealing element is positioned on one side of the first limiting part, which faces away from the electrode assembly.

Among the above-mentioned technical scheme, realize the sealing connection of end cover and casing through the sealing member to guarantee the sealing performance of end cover and casing. The sealing member is located the one side that first spacing portion deviates from electrode subassembly, and the mass flow component is difficult to cause the influence to the arrangement of sealing member, improves the leakproofness between end cover and the casing.

In a second aspect, an embodiment of the present application provides a battery, which includes a plurality of battery cells provided in any one of the embodiments of the first aspect.

In a third aspect, an embodiment of the present application provides an electric device, including the battery provided in any one of the embodiments of the second aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

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

fig. 2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

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

fig. 4 is a cross-sectional view of the battery cell shown in fig. 3;

fig. 5 is a partial view of a battery cell provided in accordance with some embodiments of the present application;

fig. 6 is a partial view of a battery cell provided in accordance with other embodiments of the present application;

fig. 7 is a schematic structural view of the current collecting member shown in fig. 5 and 6;

fig. 8 is a partial view of a battery cell provided in accordance with further embodiments of the present application;

fig. 9 is a partial view of a battery cell provided in accordance with further embodiments of the present application;

fig. 10 is a flow chart of a method of manufacturing a battery cell according to some embodiments of the present disclosure;

FIG. 11 is a schematic illustration of a roll-grooving process performed on a housing as provided by some embodiments of the present application;

FIG. 12 is a schematic view of a flanging process performed on a housing according to some embodiments of the present disclosure;

fig. 13 is a schematic structural diagram of a manufacturing apparatus of a battery cell according to some embodiments of the present application.

Icon: 10-a battery cell; 11-a housing; 111-medial side; 112-a first limit portion; 113-outer side; 114-a roller trough; 115-a second limiting part; 12-an electrode assembly; 121-a body portion; 122-a tab; 13-end cap; 14-a current collecting member; 141-a body portion; 1411-an outer surface; 1412-a first receptacle; 1413-through holes; 1414-a weld zone; 1415-inner surface; 1416-a second receptacle; 142-an elastic part; 1421-first bending section; 1422-second bending section; 1423-abutment face; 144-a hook portion; 1441 — first connection; 1442 — a second connecting portion; 1443 — third connecting portion; 1444-a limit groove; 15-a seal; 16-an electrode terminal; 17-an elastic layer; 18-a conductive layer; 20-a box body; 21-a first part; 22-a second part; 100-a battery; 200-a controller; 300-a motor; 1000-a vehicle; 2000-manufacturing equipment; 2100-a first providing device; 2200-a second providing means; 2300-a third providing means; 2400-a fourth providing device; 2500-assembling the device; z-thickness direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 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.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 as appropriate.

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

The appearances of "a plurality" in this application are intended to mean more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other 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 plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the positive current collector which is not coated with the positive active substance layer protrudes out of the positive current collector which is coated with the positive active substance layer, and the positive current collector which is not coated with the positive active substance 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 pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the negative pole mass flow body protrusion in the negative pole mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer, and the negative pole mass flow body of not scribbling 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 PP (polypropylene) or PE (polyethylene). 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.

For a general battery cell, the electrode assembly needs to be electrically connected to the case such that the case serves as a positive output electrode or a negative output electrode of the battery cell. Currently, the electrical connection between the electrode assembly and the case is prone to failure.

In the single battery, the shell is a hollow structure with one open end, the shell is provided with a bottom wall arranged opposite to the open end, and the tabs of the electrode assembly are electrically connected with the shell through the current collecting component, wherein the current collecting component is welded with the bottom wall of the shell so that the shell is used as one output pole (a positive output pole or a negative output pole) of the single battery. The inventor researches and discovers that the electrode assembly has a large moving space in the shell, and when the battery cell is in a vibration environment due to the fact that the current collecting component is welded with the bottom wall of the shell, the electrode assembly is greatly displaced relative to the shell, so that the connection between the lugs of the electrode assembly and the current collecting component fails, and the risk of the electrical connection failure between the electrode assembly and the shell occurs.

In view of this, embodiments of the present application provide a battery cell including an electrode assembly having tabs, a case, an end cap, and a current collecting member. The housing has an opening. The case serves to accommodate the electrode assembly. The end cover is used for covering the opening and is connected with the shell in a sealing mode. The current collecting component is positioned in the shell and used for connecting the pole lug and the shell so as to realize the electric connection of the pole lug and the shell. The first limiting part is used for limiting the end cover to move towards the direction close to the electrode assembly, and the current collecting component abuts against one side, facing the electrode assembly, of the first limiting part.

In such a battery cell, the current collecting member is used to electrically connect the tab to the case, and the current collecting member abuts against the side of the first limiting portion facing the electrode assembly, so as to ensure good overcurrent between the current collecting member and the case. The first limiting part not only has a limiting effect on the end cover, but also has a limiting effect on the current collecting component, so that the current collecting component has a limiting effect on the movement of the electrode assembly, the displacement of the electrode assembly in the shell along the direction of the end cover is reduced, the risk that the electrode assembly is connected with the current collecting component and fails due to overlarge displacement is reduced, and the risk that the battery assembly is electrically connected with the shell and fails is reduced.

In addition, because the current collecting component abuts against one side, facing the electrode assembly, of the first limiting portion, the first limiting portion can play a role in separating the current collecting component from the end cover, on one hand, the influence of the current collecting component on the end cover is reduced, the sealing performance of the end cover and the shell is improved, on the other hand, the current collecting component is far away from the end cover, and the risk of electrification of the end cover is reduced.

The battery cell described in the embodiment of the present application is suitable for a battery and an electric device using the battery.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a 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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure, a battery 100 is disposed inside the vehicle 1000, and the battery 100 may be disposed at a bottom portion, a head portion, or a tail portion of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may serve as an operation power source of the vehicle 1000.

The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

In some embodiments, referring to fig. 2, fig. 2 is a schematic structural diagram of a battery 100 according to some embodiments of the present disclosure, where the battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 may be connected in series or in parallel or in series-parallel. The series-parallel connection means that a plurality of battery cells 10 are connected in series or in parallel.

In some embodiments, the battery 100 may further include a bus member, and the plurality of battery cells 10 may be electrically connected to each other through the bus member, so as to connect the plurality of battery cells 10 in series or in parallel or in series-parallel.

The bus members may be metallic conductors such as copper, iron, aluminum, steel, aluminum alloys, and the like.

In some embodiments, the battery cell 10 may further include a case 20, and the case 20 is used to accommodate the battery cell 10. The case 20 may include a first portion 21 and a second portion 22, and the first portion 21 and the second portion 22 cover each other to define a receiving space for receiving the battery cell 10. Of course, the joint of the first portion 21 and the second portion 22 can be sealed by a sealing element, which can be a sealing ring, a sealant, etc.

Wherein the first portion 21 and the second portion 22 may be various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first portion 21 may be a hollow structure with one side open, the second portion 22 may also be a hollow structure with one side open, and the open side of the second portion 22 is covered on the open side of the first portion 21, so as to form the box body 20 with a receiving space. Of course, the first portion 21 may have a hollow structure with one side open, the second portion 22 may have a plate-like structure, and the second portion 22 may cover the open side of the first portion 21 to form the case 20 having the accommodating space.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present disclosure, and the battery cell 10 may include a case 11, an electrode assembly 12, an end cap 13, a current collecting member 14, and a sealing member 15.

The case 11 is a member for accommodating the electrode assembly 12, and the case 11 may have a hollow structure with one end opened, or the case 11 may have a hollow structure with both ends opened. The material of the housing 11 may be various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The housing 11 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. Illustratively, in fig. 3, the housing 11 is a cylinder.

The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 12 may include a body part 121 and a tab 122, the tab 122 protruding from an end of the body part 121. The main body part 121 may include a positive electrode tab, a negative electrode tab, and a separator. The body portion 121 may have a winding structure formed by winding a positive electrode tab, a separator, and a negative electrode tab. The main body 121 may have a stacked structure in which a positive electrode tab, a separator, and a negative electrode tab are stacked.

The positive pole piece comprises a positive current collector and positive active material layers coated on two opposite sides of the positive current collector. The negative pole piece comprises a negative current collector and negative active material layers coated on two opposite sides of the negative current collector. The body portion 121 is a portion of the electrode assembly 12 corresponding to an active material layer-coated region of the pole piece, and the tab 122 is a portion of the pole piece not coated with the active material layer. The tabs 122 may be divided into a positive tab and a negative tab, which protrude from two ends of the main body 121 respectively.

The end cap 13 is a member that covers an opening of the case 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 13 covers the opening of the case 11, and the end cap 13 and the case 11 together define a sealed space for accommodating the electrode assembly 12, the electrolyte, and the current collecting member 14. The shape of the end cap 13 may be adapted to the shape of the housing 11, for example, the housing 11 is a rectangular parallelepiped structure, the end cap 13 is a rectangular plate structure adapted to the housing 11, and for example, the housing 11 is a cylinder structure, and the end cap 13 is a circular plate structure adapted to the housing 11. The material of the end cap 13 may be various, and for example, the end cap 13 may be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 13 may be the same as or different from that of the case 11.

In the battery cell 10, the number of the end caps 13 may be one or two. If the shell 11 is a hollow structure with an opening formed at one end, one end cover 13 is correspondingly arranged; if the case 11 is a hollow structure with two open ends, two end caps 13 are correspondingly disposed, the two end caps 13 respectively cover the two open ends of the case 11, one of the positive electrode tab and the negative electrode tab of the electrode assembly 12 is electrically connected to one end cap 13, and the other is electrically connected to the case 11. In an embodiment in which the case 11 has a hollow structure with one end open, an end of the case 11 facing away from the end cap 13 may be provided with an electrode terminal 16 (not shown in fig. 3), the electrode terminal 16 is connected to the case 11 in an insulated manner, one of a positive electrode tab and a negative electrode tab of the electrode assembly 12 is electrically connected to the case 11, and the other is electrically connected to the electrode terminal 16.

The current collecting member 14 is a part located inside the case 11 and connecting the case 11 and the electrode assembly 12 to accomplish the electrical connection of the electrode assembly 12 with the case 11 such that the case 11 serves as one output pole of the battery cell 10. The current collecting member 14 may be a disk-shaped member disposed between the end cap 13 and the electrode assembly 12, for example, the case 11 is a cylinder, and the current collecting member 14 has a disk structure. The current collecting member 14 may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, or the like.

The seal 15 is a member provided between the end cover 13 and the housing 11 to achieve a sealed connection between the end cover 13 and the housing 11. The material of the sealing member 15 may be various, such as rubber, plastic, etc.

In some embodiments, the battery cell 10 may further include a pressure relief mechanism for actuating to relieve the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value.

The pressure relief mechanism may be a separate component mounted on the end cap 13, for example, the pressure relief mechanism may be a component such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure relief valve or a safety valve mounted on the end cap 13. The pressure relief mechanism may also be part of the end cap 13, for example, the end cap 13 may be provided with a scored groove, and the area defined by the scored groove forms the pressure relief mechanism.

By "activated" is meant that the pressure relief mechanism is activated or activated to a state such that the internal pressure and temperature of the battery cell 10 is vented. The actions generated by the pressure relief mechanism may include, but are not limited to: at least a portion of the pressure relief mechanism ruptures, fractures, is torn or opened, or the like. When the pressure relief mechanism is activated, the high-temperature and high-pressure substances inside the battery cell 10 are discharged as an exhaust from the activated portion. In this way, the battery cell 10 can be depressurized and warmed under controlled pressure or temperature, so that potentially more serious accidents can be avoided.

The emissions from the battery cell 10 referred to in this application include, but are not limited to: electrolyte, dissolved or split anode and cathode pole pieces, fragments of a separation film, high-temperature and high-pressure gas generated by reaction, flame and the like.

Referring to fig. 4, fig. 4 is a cross-sectional view of the battery cell 10 shown in fig. 3, and an embodiment of the present disclosure provides a battery cell 10 including a case 11, an electrode assembly 12, an end cap 13, and a current collecting member 14. The electrode assembly 12 has tabs 122. The case 11 has an opening, and the case 11 serves to accommodate the electrode assembly 12. The end cap 13 is used for covering the opening and is connected with the shell 11 in a sealing way. A current collecting member 14 is received in the case 11 on a side of the electrode assembly 12 facing the end cap 13, and the current collecting member 14 serves to connect the tab 122 and the case 11 to electrically connect the tab 122 with the case 11. The inner surface 111 of the case 11 is convexly provided with a first limiting portion 112, the first limiting portion 112 is used for limiting the end cap 13 to move towards the direction close to the electrode assembly 12, and the current collecting member 14 abuts against one side of the first limiting portion 112 facing the electrode assembly 12.

The current collecting member 14 is a component that realizes electrical connection of the case 11 and the tab 122. The current collecting member 14 and the tab 122 may be fixedly connected, for example, the current collecting member 14 and the tab 122 are welded. The tab 122 may be a positive tab of the electrode assembly 12 or a negative tab of the electrode assembly 12, that is, the current collecting member 14 may be connected to the positive tab 122 or the negative tab 122. For example, in fig. 4, an end of the case 11 facing away from the end cap 13 may be provided with an electrode terminal 16, the electrode terminal 16 is connected to the case 11 in an insulated manner, a negative electrode tab of the electrode assembly 12 is connected to the current collecting member 14, and a positive electrode tab of the electrode assembly 12 is connected to the electrode terminal 16.

The current collecting member 14 abuts on the side of the first stopper portion 112 facing the electrode assembly 12 such that the current collecting member 14 and the first stopper portion 112 contact each other to achieve electrical connection of the current collecting member 14 with the case 11. The current collecting member 14 and the first position limiting portion 112 may be held in abutting relation, or they may be fixed together after abutting, for example, the current collecting member 14 and the first position limiting portion 112 may abut and be welded together. The current collecting member 14 abuts on a side of the first stopper portion 112 facing the electrode assembly 12, and the current collecting member 14 may occupy a space between the electrode assembly 12 and the first stopper portion 112, thereby reducing a space in which the electrode assembly 12 moves within the case 11.

The inner side surface 111 of the case 11 refers to an inner side surface of a side wall of the case 11 extending in the thickness direction Z of the end cover 13, and it is understood that the inner side surface 111 extends substantially in the thickness direction Z of the end cover 13. In embodiments where the housing 11 is cylindrical, the inner side 111 of the housing 11 is cylindrical. In the embodiment where the housing 11 is a rectangular parallelepiped, the inner side 111 of the housing 11 includes four sides that are located at different orientations and are connected end to end.

The inner surface 111 of the housing 11 is convexly provided with a first limiting portion 112, and it can be understood that the first limiting portion 112 protrudes from the inner surface 111. The first stopper 112 is a structure in which the case 11 restricts the movement of the end cap 13 in a direction to approach the electrode assembly 12. The current collecting member 14 abuts on the side of the first position limiting portion 112 facing the electrode assembly 12, and the current collecting member 14 is located on the side of the electrode assembly 12 facing the end cover 13, it can be understood that the first position limiting portion 112 is located between the electrode assembly 12 and the end cover 13 in the thickness direction Z of the end cover 13. The first position-limiting portion 112 and the housing 11 may be integrally formed, or may be separately formed and then connected together, for example, the first position-limiting portion 112 and the housing 11 are welded together. The first position-limiting portion 112 may have various structures, for example, the first position-limiting portion 112 is a boss protruding from the inner side 111 of the housing 11, and for example, the first position-limiting portion 112 is an annular structure extending along the circumferential direction of the housing 11.

The current collecting member 14 is abutted against the side of the first limiting portion 112 facing the electrode assembly 12 to ensure good overcurrent between the current collecting member 14 and the case 11, so that the tab 122 is electrically connected with the case 11 through the current collecting member 14. The first limiting portion 112 not only limits the end cap 13, but also limits the current collecting member 14, so that the current collecting member 14 limits the movement of the electrode assembly 12, the displacement of the electrode assembly 12 in the housing 11 along the direction of the end cap 13 is reduced, the risk of connection failure between the tab 122 and the current collecting member 14 due to excessive displacement of the electrode assembly 12 is reduced, and the risk of electrical connection failure between the battery 100 and the housing 11 is reduced.

In addition, since the current collecting member 14 abuts against the side of the first limiting portion 112 facing the electrode assembly 12, the first limiting portion 112 can separate the current collecting member 14 from the end cover 13, on one hand, the influence of the current collecting member 14 on the end cover 13 is reduced, the sealing performance of the end cover 13 and the shell 11 is improved, on the other hand, the current collecting member 14 is far away from the end cover 13, and the risk of electrification of the end cover 13 is reduced.

In some embodiments, referring to fig. 5, fig. 5 is a partial view of a battery cell 10 provided in some embodiments of the present application, and the current collecting member 14 includes a body portion 141 and an elastic portion 142. The body part 141 is located at a side of the first position limiting part 112 facing the electrode assembly 12, and the body part 141 is used for connecting the tab 122. The elastic portion 142 is connected to the body portion 141, and the elastic portion 142 is configured to abut against the first position-limiting portion 112 along a direction away from the electrode assembly 12.

The body portion 141 is a portion where the current collecting member 14 is connected with the tab 122 to accomplish the electrical connection of the current collecting member 14 with the electrode assembly 12. Illustratively, the body portion 141 is welded to the tab 122. Taking the housing 11 as a cylinder as an example, the body portion 141 may be a disk structure located in the housing 11.

The elastic portion 142 is a portion of the current collecting member 14 that is in contact with the first stopper portion 112 and has elastic deformability. The elastic portion 142 abuts against the first position-limiting portion 112 along a direction away from the electrode assembly 12, and it can be understood that the elastic portion 142 abuts against a side of the first position-limiting portion 112 facing the electrode assembly 12. The elastic portion 142 is located on a side of the body portion 141 facing the first position-limiting portion 112. The elastic portion 142 and the main body 141 may be integrally formed, or may be separately formed and then connected to each other. The elastic portion 142 can be a variety of structures, for example, the elastic portion 142 is a spring, and for example, the elastic portion 142 is a spring. The number of the elastic portions 142 connected to the body portion 141 may be one or more.

The elastic part 142 abuts against the first limiting part 112 in the direction away from the electrode assembly 12, the elastic part 142 has elastic deformation capability, and the elastic part 142 can elastically deform according to the change of the distance between the body part 141 and the first limiting part 112, so that the elastic part 142 has a good buffering effect on the electrode assembly 12, and the risk of damage caused by rigid impact between the electrode assembly 12 and the current collecting member 14 is reduced. In addition, the elastic portion 142 is always kept in a contact state with the first stopper portion 112 when the battery 100 assembly moves in the housing 11 due to vibration of the battery cell 10, and the risk of electrical connection failure between the current collecting member 14 and the housing 11 due to vibration of the battery cell 10 is reduced.

In some embodiments, please refer to fig. 5, the elastic portion 142 is an elastic sheet bent and arranged on the body portion 141.

The elastic sheet is an elastic sheet body, and the elastic sheet can be made of metal, for example, the elastic sheet is a copper sheet, an aluminum sheet and the like.

The elastic sheet is arranged on the body part 141 in a bending way, and understandably, the elastic sheet is in a bending state, so that the elastic sheet has the capability of elastic deformation. Before the elastic sheet is formed, the elastic sheet can be in a linear structure, and after the elastic sheet is bent and formed, the elastic sheet is in a zigzag structure, so that the elastic sheet has the capability of elastic deformation.

In this embodiment, the elastic portion 142 is a spring piece bent and arranged on the body portion 141, and has a simple structure, is easy to form, and has a good deformation capability. In addition, the elastic sheet can be in large-area contact with the convex part, and overcurrent is facilitated.

In some embodiments, referring to fig. 5, the elastic portion 142 includes a first bending portion 1421 and a second bending portion 1422, the first bending portion 1421 is configured to abut against the first position-limiting portion 112, and the second bending portion 1422 is configured to connect the first bending portion 1421 and the body portion 141. In the thickness direction Z of the end cap 13, a portion of the main body 141 opposite to the first bending portion 1421 is spaced from the first bending portion 1421.

The first bending portion 1421 is a portion of the elastic portion 142 abutting against the first position-limiting portion 112. After the first bending portion 1421 abuts against the first position-limiting portion 112, the first bending portion 1421 and the first position-limiting portion 112 may be stacked in the thickness direction Z of the end cap 13. The first bending portion 1421 may be a flat plate.

The second bending part 1422 is a portion where the elastic part 142 connects the first bending part 1421 and the body 141. The second bending portion 1422 is bent relative to the first bending portion 1421, and a fold is formed at a connection between the second bending portion 1422 and the first bending portion 1421. The second bending portion 1422 may also be a flat plate.

In the thickness direction Z of the end cap 13, a portion of the main body portion 141 opposite to the first bent portion 1421 is a portion of the main body portion 141 covered by a projection of the first bent portion 1421.

In the embodiment, the elastic portion 142 includes a first bending portion 1421 and a second bending portion 1422 connected to each other, and the first bending portion 1421 and the second bending portion 1422 can be formed by bending, so that the forming is simple. The portion of the main body 141 opposite to the first bending portion 1421 is spaced from the first bending portion 1421, and the gap between the main body 141 and the first bending portion 1421 can provide a deformation space for the first bending portion 1421, so that the first bending portion 1421 not only has the capability of deforming in a direction away from the main body 141, but also has the capability of deforming in a direction close to the main body 141, so that the elastic portion 142 can play a good role of buffering the electrode assembly 12 when the electrode assembly 12 moves in a direction close to the end cap 13, and reduce the risk of damage due to rigid impact between the electrode assembly 12 and the current collecting member 14.

In some embodiments, referring to fig. 6, fig. 6 is a partial view of a battery cell 10 according to other embodiments of the present disclosure, in which the battery cell 10 further includes an elastic layer 17, and the elastic layer 17 is supported between the body portion 141 and the first bending portion 1421.

The elastic layer 17 is an elastic member supported between the main body 141 and the first bending portion 1421. The elastic layer 17 may be a spring, elastic rubber, or the like.

The elastic layer 17 can provide a good elastic supporting function for the first bending portion 1421, so as to enhance the buffering function of the elastic portion 142 on the electrode assembly 12, and improve the ability of the first bending portion 1421 to recover from deformation after being deformed toward the body portion 141.

In some embodiments, referring to fig. 5 and fig. 6, the second bending portion 1422 is connected to an edge of the main body 141, and the first bending portion 1421 is bent toward the main body 141 relative to the second bending portion 1422.

The edge of the body 141 refers to an edge position where the outer circumferential surface of the body 141 is located. Before the elastic portion 142 is formed, assuming that the second bending portion 1422 and the first bending portion 1421 are coplanar, the second bending portion 1422 is bent toward the main body 141 relative to the first bending portion 1421, so that the first bending portion 1421 and the second bending portion 1422 are located on different planes, and the first bending portion 1421 is bent toward the main body 141 relative to the second bending portion 1422.

For example, taking the body portion 141 as a disc-shaped structure as an example, in a radial direction of the body portion 141, an end of the second bending portion 1422 away from the first bending portion 1421 exceeds the first limiting portion 112.

The second bending portion 1422 is connected to the edge of the main body 141, so that the second bending portion 1422 has a good ability to deform relative to the main body 141, and the first bending portion 1421 is bent relative to the second bending portion 1422 toward the main body 141, so that the first bending portion 1421 has a good ability to deform relative to the second bending portion 1422, and thus the entire elastic portion 142 has a good ability to deform. In addition, since the second bending part 1422 is connected to the edge of the body 141, the second bending part 1422 is closer to the inner surface 111 of the housing 11, so that more parts of the first bending part 1421 can abut against the first position-limiting part 112, the contact area between the first bending part 1421 and the first position-limiting part 112 is increased, and the flow area between the current collecting member 14 and the housing 11 is increased.

In some embodiments, referring to fig. 5-7, fig. 7 is a schematic structural view of the current collecting member 14 shown in fig. 5 and 6, the body portion 141 has an outer surface 1411 facing the end cap 13, the outer surface 1411 of the body portion 141 is provided with a first accommodating portion 1412, and the first accommodating portion 1412 is used for accommodating at least a portion of the elastic portion 142.

The outer surface 1411 of the body portion 141 refers to the surface of the body portion 141 facing the end cap 13 and closest to the end cap 13. The outer surface 1411 is provided with a first receiving part 1412, and it can be understood that the first receiving part 1412 is recessed from the outer surface 1411 of the body part 141 in a direction approaching the electrode assembly 12.

The first receiving portion 1412 may be a groove structure provided at the outer surface 1411 of the body portion 141. The first receiving portion 1412 functions to receive the elastic portion 142, and the elastic portion 142 may be entirely received in the first receiving portion 1412, or the elastic portion 142 may be partially received in the first receiving portion 1412. The first receiving portion 1412 may be one or a plurality thereof. For example, the elastic portion 142 in the current collecting member 14 is one, and in this case, the first receiving portion 1412 may be one. As another example, the number of the elastic portions 142 in the current collecting member 14 may be plural, and in this case, the number of the first receiving portions 1412 may be plural, and each of the first receiving portions 1412 may receive at least one of the first elastic portions 142.

Taking the elastic portion 142 including the first bending portion 1421 and the second bending portion 1422 as an example, the first bending portion 1421 and the second bending portion 1422 may be both accommodated in the first accommodating portion 1412, so that the elastic portion 142 is completely accommodated in the first accommodating portion 1412; the first bending part 1421 may be accommodated in the first accommodating part 1412, and the second bending part 1422 may be at least partially located outside the first accommodating part 1412, so that the elastic part 142 is partially accommodated in the first accommodating part 1412. In the embodiment where the portion of the main body 141 opposite to the first bending portion 1421 is spaced from the first bending portion 1421, the first bending portion 1421 is opposite to the bottom surface of the first accommodating portion 1412 in the thickness direction Z of the end cap 13.

The outer surface 1411 of the body portion 141 is provided with the first accommodating portion 1412, and the first accommodating portion 1412 can provide an accommodating space for the elastic portion 142, so that the size of the elastic portion 142 protruding from the outer surface 1411 of the body portion 141 is reduced, the internal space of the case 11 occupied by the elastic portion 142 is reduced, more space is made for the electrode assembly 12, and the energy density of the battery cell 10 is improved.

In some embodiments, with continued reference to fig. 5-7, the elastic portion 142 has an abutting surface 1423 facing the end cap 13, the abutting surface 1423 is used for abutting against the first position-limiting portion 112, and the abutting surface 1423 is flush with the outer surface 1411.

The abutting surface 1423 is a surface of the elastic portion 142 for abutting against the first stopper 112. Abutment surface 1423 is flush with outer surface 1411, i.e., abutment surface 1423 is coplanar with outer surface 1411. Both the abutment surface 1423 and the outer surface 1411 are planar.

The abutting surface 1423 is flush with the outer surface 1411 of the body portion 141, so that the outer surface 1411 of the body portion 141 can abut against the first limiting portion 112, thereby increasing the contact area between the current collecting member 14 and the first limiting portion 112, and further increasing the flow area between the current collecting member 14 and the housing 11.

In some embodiments, the region of the body part 141 provided with the first receiving part 1412 is provided with a through hole 1413.

The area of the body part 141 provided with the first receiving part 1412 is provided with a through hole 1413, in other words, the bottom surface of the first receiving part 1412 is provided with a through hole 1413. The through-hole 1413 on the body portion 141 forms a discharge passage for discharging the discharge inside the battery cell 10. The body portion 141 has an inner surface 1415 facing the electrode assembly 12, and the inner surface 1415 of the body portion 141 is a surface of the body portion 141 facing the electrode assembly 12 and closest to the electrode assembly 12. The through hole 1413 may simultaneously penetrate the bottom surface of the first receiving portion 1412 and the inner surface 1415 of the body portion 141 to form a discharge passage.

The through hole 1413 provided in the area of the body portion 141 where the first receiving portion 1412 is provided may be one or more. For example, in fig. 7, the area of the body part 141 provided with the first receiving part 1412 is provided with a plurality of through holes 1413.

In the embodiment where the end cap 13 has a pressure relief mechanism, the exhaust inside the battery cell 10 flows through the through hole 1413 and is finally discharged to the outside of the battery cell 10 through the pressure relief mechanism.

The through hole 1413 is formed in the body part 141, and the discharge material inside the single battery 10 on the side of the body part 141 facing the electrode assembly 12 can flow to the side of the body part 141 facing the end cap 13 through the through hole 1413, so that the discharge material inside the single battery 10 is discharged to the outside of the single battery 10 when the single battery 10 is in thermal runaway, and the safety of the single battery 10 is improved.

In some embodiments, with reference to fig. 7, the main body 141 is provided with a plurality of elastic portions 142 spaced along the circumference of the main body 141.

In the embodiment that the body portion 141 is provided with the first accommodating portion 1412 for accommodating the elastic portion 142, at least one elastic portion 142 may be correspondingly arranged in one first accommodating portion 1412, that is, one elastic portion 142 may be accommodated in one first accommodating portion 1412, or one first accommodating portion 1412 may accommodate a plurality of elastic portions 142. Illustratively, in fig. 7, a first accommodating portion 1412 is used for accommodating one elastic portion 142, the first accommodating portion 1412 has a substantially fan shape, and a plurality of first accommodating portions 1412 meet at a central position of the body portion 141. The body portion 141 is provided at a central position with a central hole passage for being disposed opposite to the central hole of the electrode assembly 12.

The plurality of elastic portions 142 distributed at intervals along the circumferential direction of the body portion 141 can be abutted against the first limiting portion 112, so that the contact area between the current collecting member 14 and the first limiting portion 112 is increased, the flow area between the current collecting member 14 and the housing 11 is increased, and large-area flow is realized. In addition, the plurality of elastic parts 142 distributed at intervals along the circumferential direction of the body part 141 each can buffer the electrode assembly 12, further reducing the risk of damage to the electrode assembly 12 due to impact.

In some embodiments, with continued reference to fig. 7, the body portion 141 has a plurality of welding regions 1414 circumferentially spaced apart, the welding regions 1414 are used for welding with the tab 122, and at least one elastic portion 142 is disposed between two adjacent welding regions 1414 in the circumferential direction of the body portion 141.

The welding region 1414 is a portion where the body portion 141 and the tab 122 are welded. At least one elastic portion 142 may be provided between two adjacent welding lands 1414 in the circumferential direction of the main body portion 141, that is, one elastic portion 142 may be provided between two adjacent welding lands 1414, or a plurality of elastic portions 142 may be provided. For example, in fig. 7, one elastic portion 142 is provided between two adjacent welding areas 1414, so that the elastic portion 142 and the welding areas 1414 are alternately arranged in the circumferential direction of the body portion 141.

In the embodiment in which the body portion 141 is provided with the first accommodating portion 1412 accommodating the elastic portion 142, in the circumferential direction of the body portion 141, one welding region 1414 may be formed between two adjacent first accommodating portions 1412, so that the first accommodating portions 1412 and the welding regions 1414 are alternately arranged in the circumferential direction of the body portion 141. Illustratively, the welding area 1414 and the first receiving portion 1412 are each substantially in the shape of a sector, and the elastic portion 142, the first receiving portion 1412 and the welding area 1414 on the body portion 141 are all three.

In the present embodiment, at least one elastic portion 142 is disposed between two adjacent welding regions 1414 in the circumferential direction of the body portion 141, so that the welding regions 1414, which are used for welding the tabs 122, of the elastic portion 142 and the body portion 141 are disposed at a position offset in the circumferential direction of the body portion 141, and the welding seal formed by welding the welding regions 1414 and the tabs 122 is not easily affected by the elastic portion 142, so that the size of the welding seal in the radial direction of the current collecting member 14 is as large as possible, the risk of polarization of the electrode assembly 12 is reduced, and the service life of the battery cell 10 is prolonged.

In some embodiments, with continued reference to fig. 5 and 6, the body portion 141 has an inner surface 1415 facing away from the end cap 13, the inner surface 1415 of the body portion 141 being provided with a second receiving portion 1416 at the weld zone 1414, the second receiving portion 1416 being for receiving at least a portion of the tab 122.

The inner surface 1415 of the body portion 141 is a surface of the body portion 141 facing the electrode assembly 12 and closest to the electrode assembly 12. The inner surface 1415 of the body part 141 is provided with a second receiving part 1416 at the welding region 1414, it being understood that the second receiving part 1416 is recessed from the inner surface 1415 of the body part 141 in a direction away from the electrode assembly 12, and the second receiving part 1416 is located at the welding region 1414.

Taking the example where one welding region 1414 is formed between two first accommodating portions 1412 adjacent in the circumferential direction of the body portion 141, the second accommodating portions 1416 and the first accommodating portions 1412 may be alternately arranged in the circumferential direction of the body portion 141.

The second receiving part 1416 can receive at least a portion of the tab 122, thereby reducing the occupation of the tab 122 in the inner space of the case 11 to make more space for the body part 121 of the electrode assembly 12, which is advantageous for increasing the energy density of the battery cell 10. In addition, the thickness of the portion of the welding region 1414 where the second accommodating portion 1416 is disposed is relatively thin, which facilitates the welding fixation of the welding region 1414 and the tab 122, and ensures the firmness of the welding region 1414 and the tab 122 after welding. Taking the welding between the welding region 1414 and the tab 122 by penetration welding as an example, since the thickness of the portion of the second accommodating portion 1416 disposed on the welding region 1414 is relatively thin, the welding region 1414 and the tab are easily penetrated to realize welding, and the firmness of the two after welding is ensured.

In some embodiments, referring to fig. 8, fig. 8 is a partial view of a battery cell 10 according to still other embodiments of the present disclosure, in which the current collecting member 14 includes a body portion 141 and a latching portion 144, the body portion 141 is located on a side of the first position-limiting portion 112 facing the electrode assembly 12, the body portion 141 is used for connecting the tab 122, the latching portion 144 is connected to the body portion 141, and the latching portion 144 is used for latching with the first position-limiting portion 112 to limit the body portion 141 from moving toward or away from the end cap 13.

The hanging portion 144 is a portion of the current collecting member 14 that forms a hanging fit with the first position-limiting portion 112. The hooking portion 144 forms a hooking engagement with the current collecting member 14, and can restrict the movement of the body portion 141 in a direction toward or away from the end cap 13, that is, the movement of the body portion 141 in the thickness direction Z of the end cap 13. The number of the hook portions 144 in the current collecting member 14 may be one or more. In fig. 8, there are a plurality of the hooking portions 144 in the current collecting member 14, and the plurality of the hooking portions 144 may be distributed in the body portion 141 at intervals along the circumferential direction of the body portion 141.

In the present embodiment, the hooking portion 144 of the current collecting member 14 is engaged with the first position-limiting portion 112 in a hooking manner, so that the body portion 141 can be limited from moving toward or away from the end cap 13, the current collecting member 14 and the first position-limiting portion 112 can be always kept in close contact with each other, the stability of the electrical connection between the current collecting member 14 and the housing 11 is enhanced, and the flow area between the current collecting member 14 and the housing 11 is ensured.

In some embodiments, the hooking portion 144 includes a first connection portion 1441, a second connection portion 1442, and a third connection portion 1443. The first connecting portion 1441 is connected to the body portion 141, and the first connecting portion 1441 is configured to abut against a side of the electrode assembly 12 facing the first limiting portion 112. The second connecting portion 1442 is configured to abut against a side of the first limiting portion 112 away from the electrode assembly 12. The third connection part 1443 is used to connect the first connection part 1441 and the second connection part 1442.

The first connection portion 1441 is a portion of the hanging portion 144 abutting against a side of the first position-limiting portion 112 facing the electrode assembly 12. The first connection portion 1441 is a portion of the hanging portion 144 abutting against a side of the first position-limiting portion 112 away from the electrode assembly 12. It can be understood that the second connecting portion 1442 and the first connecting portion 1441 respectively abut against two sides of the first limiting portion 112 in the thickness direction Z of the end cover 13. The third connection part 1443 is a part where the hooking part 144 connects the first connection part 1441 and the second connection part 1442 together.

The first connection portion 1441 and the second connection portion 1442 of the hooking portion 144 abut against two sides of the first limiting portion 112, so that the hooking portion 144 and the first limiting portion 112 have a large contact area, and the flow area between the current collecting member 14 and the housing 11 is increased.

In some embodiments, the first connecting portion 1441, the third connecting portion 1443, and the second connecting portion 1442 are connected in series and collectively define a limiting groove 1444, and the limiting groove 1444 is configured to receive at least a portion of the first limiting portion 112.

The limit groove 1444 is defined by the first connection portion 1441, the third connection portion 1443, and the second connection portion 1442, and the first connection portion 1441, the third connection portion 1443, and the second connection portion 1442 are located at three different orientations of the first limit portion 112. For example, the first connecting portion 1441 and the second connecting portion 1442 are respectively located on both sides of the first limiting portion 112 in the thickness direction Z of the end cover 13, and the third connecting portion 1443 is located on the inner peripheral side of the first limiting portion 112.

For example, the hooking portion 144 may be formed by a sheet member connected to the body portion 141 and bent to form a first connection portion 1441, a third connection portion 1443, and a second connection portion 1442 connected in sequence.

In the embodiment, the first connecting portion 1441, the third connecting portion 1443 and the second connecting portion 1442 are sequentially connected to form a limiting groove 1444 for accommodating the first limiting portion 112, and the hanging buckle portion 144 has a simple structure and is easy to form.

In some embodiments, referring to fig. 9, fig. 9 is a partial view of a battery cell 10 according to still other embodiments of the present disclosure, in which the battery cell 10 further includes a conductive layer 18, and the conductive layer 18 is used for connecting the first position-limiting portion 112 and the third connecting portion 1443.

The conductive layer 18 is a member that realizes electrical connection between the first stopper portion 112 and the third connection portion 1443. The conductive layer 18 may be a conductor such as a conductive paste, a conductive metal, or the like.

After the hooking portion 144 is hooked on the first position-limiting portion 112, the first connecting portion 1441 and the second connecting portion 1442 of the hooking portion 144 both abut against the first position-limiting portion 112 to keep good contact with the first position-limiting portion 112, but there may be a gap between the third connecting portion 1443 and the first position-limiting portion 112, so that the third connecting portion 1443 does not contact with the first position-limiting portion 112.

Therefore, by providing the conductive layer 18 between the first stopper portion 112 and the third connection portion 1443, the electrical connection of the first stopper portion 112 and the third connection portion 1443 is achieved, and the flow area between the current collecting member 14 and the case 11 is further increased.

In some embodiments, with continued reference to fig. 5, 6, 8, and 9, the first position-limiting portion 112 is an annular structure extending along the circumferential direction of the housing 11.

In the case where the first stopper portion 112 is an annular structure extending in the circumferential direction of the housing 11, the housing 11 may be a cylindrical structure.

The first limiting part 112 is of an annular structure and is easy to mold and manufacture, the whole circumference of the first limiting part 112 can limit the end cover 13, and the limiting capacity of the first limiting part 112 on the end cover 13 and the current collecting component 14 is guaranteed.

In some embodiments, a roller groove 114 is disposed on the outer side surface 113 of the housing 11 corresponding to the first position-limiting portion 112.

The outer side surface 113 of the housing 11 refers to an outer side surface of a side wall of the housing 11 extending in the thickness direction Z of the end cap 13, and it is understood that the outer side surface 113 extends substantially in the thickness direction Z of the end cap 13.

In the process of forming the roller groove 114, the case 11 is formed with the first stopper 112 at a position corresponding to the roller groove 114, thereby confining the current collecting member 14 and the electrode assembly 12 within the case 11, and the first stopper 112 is simply formed, so that the assembly of the battery cell 10 is simpler and more economical.

In some embodiments, the housing 11 has a second limiting portion 115, and at least a part of the end cap 13 is located between the first limiting portion 112 and the second limiting portion 115 in the thickness direction Z of the end cap 13, and the first limiting portion 112 and the second limiting portion 115 are used to jointly limit the movement of the end cap 13 in the thickness direction Z of the end cap 13.

The second position-limiting portion 115 and the first position-limiting portion 112 both limit the position of the end cap 13, the second position-limiting portion 115 limits the movement of the end cap 13 in the direction away from the electrode assembly 12, and the first position-limiting portion 112 limits the movement of the end cap 13 in the direction close to the electrode assembly 12. The second stopper portion 115 and the first stopper portion 112 fit and restrict the end cap 13 to the end of the housing 11 having the opening.

For example, the second limiting portion 115 may be a flanged structure that the housing 11 is partially folded inward, and the second limiting portion 115 may be formed at an end of the housing 11 by folding the housing 11. In the process of assembling the single battery cell 10, the electrode assembly 12 and the current collecting member 14 may be accommodated in the case 11, the roller groove 114 may be processed on the case 11 to form the first limiting portion 112, the end cap 13 may be abutted against the first limiting portion 112, and the second limiting portion 115 may be formed by folding the case 11 to fix the end cap 13 and the case 11.

In this embodiment, the second limiting portion 115 and the first limiting portion 112 can limit the movement of the end cap 13 in the thickness direction Z of the end cap 13 together, so that the end cap 13 cannot move relative to the housing 11, and the firmness of the end cap 13 after being connected with the housing 11 is ensured.

In some embodiments, the battery cell 10 further includes a sealing member 15, the sealing member 15 is used for sealing the end cap 13 and the case 11, and the sealing member 15 is located on the side of the first position limiting portion 112 facing away from the electrode assembly 12.

The seal 15 is a member for achieving the sealing connection of the end cap 13 and the housing 11. The sealing member 15 may be made of rubber, plastic, or the like.

Illustratively, the sealing element 15 is wrapped around the outer periphery of the end cap 13, the sealing element 15 is partially located between the end cap 13 and the first position-limiting portion 112, and the sealing element 15 is partially located between the end cap 13 and the second position-limiting portion 115.

The end cover 13 is connected to the housing 11 in a sealing manner by a sealing member 15, so as to ensure the sealing performance of the end cover 13 to the housing 11. The sealing member 15 is located on the side of the first position-limiting portion 112 facing away from the electrode assembly 12, and the current collecting member 14 is less likely to affect the arrangement of the sealing member 15, thereby improving the sealing property between the end cap 13 and the case 11.

The embodiment of the present application provides a battery 100, which includes a plurality of battery cells 10 provided in any one of the above embodiments.

The embodiment of the present application provides an electric device, including the battery 100 provided in any one of the above embodiments.

The powered device may be any of the devices described above that employ battery 100.

In addition, referring to fig. 5, an embodiment of the present application further provides a cylindrical single body, which includes a housing 11, an electrode assembly 12, an end cap 13, and a current collecting member 14. The case 11 is electrically connected with the tabs 122 of the electrode assembly 12 through the current collecting member 14. A first stopper 112 for restricting the movement of the end cap 13 toward the electrode assembly 12 is protruded from an inner surface 111 of the case 11. The current collecting member 14 includes a body portion 141 and an elastic portion 142, the body portion 141 is connected to the tab 122 of the electrode assembly 12, the body portion 141 is located on a side of the first position limiting portion 112 facing the electrode assembly 12, the elastic portion 142 is connected to the body portion 141, and the elastic portion 142 abuts against the first position limiting portion 112 in a direction away from the electrode assembly 12. The elastic portion 142 can always maintain the abutting state with the first stopper portion 112, and the electrical connection between the current collecting member 14 and the case 11 and the electrical connection between the current collecting member 14 and the electrode assembly 12 can be ensured to be less prone to fail even in a vibration environment.

Referring to fig. 10, fig. 10 is a flowchart of a method for manufacturing a battery cell 10 according to some embodiments of the present disclosure, where the method includes:

s100: providing a housing 11, the housing 11 having an opening;

s200: providing an electrode assembly 12 having tabs 122;

s300: providing an end cap 13;

s400: providing a current collecting member 14;

s500: connecting the current collecting member 14 to the tab 122 of the electrode assembly 12;

s600: the electrode assembly 12 and the current collecting member 14 are accommodated in the case 11;

s700: processing a roller groove 114 on the shell 11, so that a first limiting part 112 protruding from the inner side surface 111 of the shell 11 is correspondingly formed at the position of the shell 11 where the roller groove 114 is formed;

s800: the end cap 13 is fitted to the opening, and the end cap 13 is sealingly connected to the housing 11.

The first limiting portion 112 is used for limiting the end cap 13 to move towards the electrode assembly 12, the current collecting member 14 is located on one side of the electrode assembly 12 facing the end cap 13, and the current collecting member 14 abuts against one side of the first limiting portion 112 facing the electrode assembly 12.

In the above method, the order of step S100, step S200, step S300, and step S400 is not limited, for example, step S400, step S300, step S200, and step S100 may be executed first, then step S300, and then step S200.

In some embodiments, referring to fig. 11, fig. 11 is a schematic view of the roll-to-roll processing of the housing 11 according to some embodiments of the present disclosure, in which the current collecting member 14 includes a body portion 141 and an elastic portion 142, the body portion 141 is connected to the tab 122, and the elastic portion 142 is connected to the body portion 141. In the process of processing the roller groove 114 on the case 11, the elastic portion 142 is pressed by the portion of the case 11 where the roller groove 114 is formed, so that the elastic portion 142 is bent relative to the main body 141, and the elastic portion 142 abuts against the first limiting portion 112 along the direction away from the electrode assembly 12.

The direction indicated by the arrow in fig. 11 is a direction in which the housing 11 is deformed by the pressing force in the processing of the roller groove 114.

During the process of processing the roller groove 114 of the housing 11, the portion of the housing 11 forming the roller groove 114 presses the elastic portion 142 of the current collecting member 14, so that the elastic portion 142 bends relative to the body portion 141 and keeps elastically abutting against the first limiting portion 112, that is, after the process of processing the roller groove 114 of the housing 11, the elastic portion 142 of the current collecting member 14 naturally elastically abuts against the first limiting portion 112, thereby improving the assembly efficiency of the battery cell 10.

In the embodiment where the current collecting member 14 includes the main body 141 and the hooking portion 144, the housing 11 may be a sheet-like member that is connected to the main body 141 by pressing at a portion where the roller groove 114 is formed during the processing of the roller groove 114, so that the sheet-like member is bent and deformed to form the hooking portion 144 that is hooked to the first stopper portion 112.

In some embodiments, referring to fig. 12, fig. 12 is a schematic view of flanging the housing 11 according to some embodiments of the present application, and after the end cap 13 is covered on the opening, the manufacturing method further includes:

the shell 11 is flanged so that the shell 11 forms a second limiting portion 115, so that the second limiting portion 115 and the first limiting portion 112 jointly limit the movement of the end cover 13 in the thickness direction Z of the end cover 13.

The direction indicated by the arrow in fig. 12 is the direction in which the housing 11 is forced during the burring process of the housing 11.

The second limiting part 115 which has a limiting effect on the end cover 13 is formed by flanging the shell 11, and the second limiting part 115 is simple in forming mode and high in forming efficiency.

It should be noted that, for the structure of the battery cell 10 manufactured by the manufacturing method provided in each of the above embodiments, reference may be made to the battery cell 10 provided in each of the above embodiments, and details are not repeated herein.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a manufacturing apparatus 2000 for a battery cell 10 according to some embodiments of the present disclosure, which includes a first providing device 2100, a second providing device 2200, a third providing device 2300, a fourth providing device 2400, and an assembling device 2500.

The first providing device 2100 is used to provide a housing 11, and the housing 11 has an opening. The second providing device 2200 is for providing the electrode assembly 12 having the tab 122. The third providing device 2300 is used for providing the end cap 13. The fourth supplying device 2400 is used to supply the current collecting member 14. Assembly device 2500 is used to connect current collecting member 14 to tab 122; the assembly device 2500 is also used to house the electrode assembly 12 and the current collecting member 14 within the case 11; the assembling device 2500 is further configured to machine a roller groove 114 on the housing 11, so that a first limiting portion 112 protruding from the inner side surface 111 of the housing 11 is correspondingly formed at a position where the roller groove 114 is formed on the housing 11; the assembly device 2500 is also used to cover the opening with the end cap 13 and to connect the end cap 13 with the housing 11 in a sealing manner.

It should be noted that, with regard to the structure of the battery cell 10 manufactured by the manufacturing apparatus 2000 provided in the foregoing embodiments, reference may be made to the battery cell 10 provided in each of the foregoing embodiments, and details are not repeated herein.

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

The above embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application, and those skilled in the art can make various modifications and variations of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

an electrode assembly having tabs;

a case having an opening for accommodating the electrode assembly;

the end cover is used for covering the opening and is connected with the shell in a sealing way;

a current collecting member received in the case and located on a side of the electrode assembly facing the end cap, the current collecting member being used to connect the tab and the case to electrically connect the tab and the case;

the first limiting part is used for limiting the end cover to move towards the direction close to the electrode assembly, and the current collecting component abuts against one side, facing the electrode assembly, of the first limiting part.

2. The battery cell according to claim 1, wherein the current collecting member comprises:

the body part is positioned on one side, facing the electrode assembly, of the first limiting part and is used for connecting the lug;

the elastic part is connected with the body part and used for abutting against the first limiting part along the direction departing from the electrode assembly.

3. The battery cell as claimed in claim 2, wherein the elastic portion is a spring piece bent and arranged on the body portion.

4. The battery cell according to claim 2, wherein the elastic portion includes:

the first bending part is used for abutting against the first limiting part;

a second bent portion for connecting the first bent portion and the body portion;

in the thickness direction of the end cover, a part of the body part opposite to the first bending part is arranged with a gap from the first bending part.

5. The battery cell of claim 4, further comprising an elastic layer supported between the body portion and the first bending portion.

6. The battery cell as claimed in claim 4, wherein the second bending portion is connected to an edge of the main body portion, and the first bending portion is bent toward the main body portion with respect to the second bending portion.

7. The battery cell as recited in claim 2, wherein the body portion has an outer surface facing the end cap, the outer surface being provided with a first receiving portion for receiving at least a portion of the elastic portion.

8. The battery cell as recited in claim 7 wherein the resilient portion has an abutment surface facing the end cap, the abutment surface for abutting the first retention portion, the abutment surface being flush with the outer surface.

9. The battery cell according to claim 7, wherein a region of the body portion where the first receiving portion is provided with a through hole.

10. The battery cell as recited in claim 2, wherein the body portion is provided with a plurality of the elastic portions spaced apart along a circumferential direction of the body portion.

11. The battery cell as recited in claim 10, wherein the body portion has a plurality of circumferentially spaced weld regions for welding with the tab, and at least one of the elastic portions is disposed between adjacent two of the weld regions in a circumferential direction of the body portion.

12. The battery cell as recited in claim 11 wherein the body portion has an inner surface facing away from the end cap, the inner surface being provided with a second receiving portion in the weld region for receiving at least a portion of the tab.

13. The battery cell according to claim 1, wherein the current collecting member comprises:

and the hanging and buckling part is connected with the body part and is used for being matched with the first limiting part in a hanging and buckling mode so as to limit the body part to move towards the direction close to or far away from the end cover.

14. The battery cell as recited in claim 13, wherein the hook portion comprises:

the first connecting part is connected with the body part and is used for abutting against one side, facing the first limiting part, of the electrode assembly;

the second connecting part is abutted to one side, away from the electrode assembly, of the first limiting part;

a third connecting portion for connecting the first connecting portion and the second connecting portion.

15. The battery cell as recited in claim 14, wherein the first connecting portion, the third connecting portion and the second connecting portion are connected in sequence and together define a limiting groove for receiving at least a portion of the first limiting portion.

16. The battery cell of claim 15, further comprising:

and the conducting layer is used for connecting the first limiting part and the third connecting part.

17. The battery cell as recited in any of claims 1-16, wherein the first limiting portion is an annular structure extending circumferentially along the housing.

18. The battery cell according to any one of claims 1 to 16, wherein a roller groove is provided on an outer side surface of the case at a position corresponding to the first stopper portion.

19. The battery cell of any one of claims 1-16, wherein the housing has a second restraint portion, and at least a portion of the end cap is positioned between the first restraint portion and the second restraint portion in a thickness direction of the end cap, and the first restraint portion and the second restraint portion are configured to cooperatively restrain movement of the end cap in the thickness direction of the end cap.

20. The battery cell of any of claims 1-16, further comprising:

and the sealing element is used for sealing the end cover and the shell, and the sealing element is positioned on one side of the first limiting part, which faces away from the electrode assembly.

21. A battery comprising a plurality of battery cells according to any one of claims 1-20.

22. An electrical device, comprising the battery of claim 21.