CN218602700U - Battery monomer, battery and consumer - Google Patents

Abstract

The embodiment of the application provides a battery monomer, battery and consumer, belongs to battery technical field. The battery cell includes a case, an electrode assembly, an electrode terminal, and a blocking member. The case has a wall portion, and the electrode assembly is accommodated in the case. The electrode terminal is arranged on the wall portion and provided with a stepped hole, the electrode terminal is provided with a first surface farthest away from the electrode assembly along the thickness direction of the wall portion, the stepped hole comprises a first hole section and a second hole section which are continuously arranged, the first hole section is arranged on the first surface, and the second hole section is arranged on one side, close to the electrode assembly, of the first hole section. The plugging piece is at least partially positioned in the second hole section, is connected with the electrode terminal in a welding mode, and forms a welding portion at the welding position. The first bore section is configured to receive at least a portion of the weld such that the weld does not protrude beyond the first surface. The battery cell having such a structure has the ability to achieve stable electrical connection with external parts, and can achieve stable electrical connection between the external parts and the electrode terminals.

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

Batteries are widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and the like.

The battery cell serves as an energy storage element, and generally generates electric energy by chemically reacting an electrode assembly with an electrolyte. The battery cell is generally connected to an external part to output electric power, and therefore, the battery cell needs to have the ability to make a stable electrical connection with the external part. How to realize stable electrical connection between the battery cell and external components is a technical problem which needs to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a single battery, a battery and electric equipment, can realize that single battery is connected with the external component is stable electrically.

In a first aspect, an embodiment of the present application provides a battery cell including a case, an electrode assembly, an electrode terminal, and a blocking member. The housing has a wall portion; the electrode assembly is accommodated in the case; the electrode terminal is arranged on the wall portion and electrically connected with the electrode assembly, the electrode terminal is provided with a stepped hole, the electrode terminal is provided with a first surface which deviates from and is farthest away from the electrode assembly along the thickness direction of the wall portion, the stepped hole comprises a first hole section and a second hole section which are continuously arranged, the first hole section is arranged on the first surface, and the second hole section is arranged on one side, close to the electrode assembly, of the first hole section; the plugging piece is at least partially positioned in the second hole section, the plugging piece is connected with the electrode terminal in a welding mode, and a welding part is formed at the welding position; the first hole section is used for accommodating at least one part of the welding part, so that the welding part does not protrude out of the first surface.

Among the above-mentioned technical scheme, the first hole section of shoulder hole can hold the welding part that shutoff piece and electrode terminals welding produced, make the welding part not protrusion in electrode terminals's first surface, make external component be difficult for receiving the influence of welding part when leaning on with the first surface, can increase the area of contact of external component and first surface, the fastness of external component in electrode terminals has been improved, can realize external component and electrode terminals's stable electricity and be connected, make and stably overflow between electrode terminals and the external component.

In some embodiments, the blocking piece comprises a main body region and an edge region, the edge region is arranged around the main body region, and the welding part is connected with the edge region and at least partially protrudes from the bottom surface of the first hole section. The edge region and the bottom surface of the first hole section are connected by a welding part to fix the blocking piece to the electrode terminal. During welding, the welding can be carried out along the edge of the edge area, and the welding efficiency is improved.

In some embodiments, the edge region has a second surface facing away from and furthest from the electrode assembly in the thickness direction, the second surface being flush with the bottom surface of the first hole segment. Therefore, the edge area is not protruded out of the bottom surface of the first hole section, the second surface is farther away from the first surface, the welding part can be farther away from the first surface, and the risk that the welding part is protruded out of the first surface is further reduced.

In some embodiments, the edge region has a second surface facing away from and furthest from the electrode assembly in the thickness direction, the second surface being located between the first surface and the bottom surface of the first aperture section. Therefore, a part of the edge area protrudes out of the bottom surface of the first hole section, so that the outer contour of the edge area can be identified by welding equipment more conveniently during welding, and the welding efficiency and the welding quality are improved.

In some embodiments, the edge region has a first outer peripheral surface connected to the second surface, and the weld connects the first outer peripheral surface and the bottom surface of the first bore section. When welding, the welding equipment can confirm the welding position through discerning the first outer peripheral face in marginal zone, improves welding efficiency and welding quality. Because the welding part is connected with the first outer peripheral surface and the bottom surface of the first hole section, the firmness of the edge region after being connected with the electrode terminal through the welding part can be improved.

In some embodiments, the distance between the second surface and the bottom surface of the first hole section in the thickness direction is H ₁ And satisfies the following conditions: h ₁ Less than or equal to 0.1mm. If H ₁ The distance between the second surface and the bottom surface of the first hole section is too large and the distance between the second surface and the first surface is too small, so that after the edge region is welded with the electrode terminal, the risk that the welding part protrudes out of the first surface exists. And H ₁ Less than or equal to 0.1mm, the second surface can be far away from the first surface, and the risk that the welding part protrudes out of the first surface is further reduced.

In some embodiments, the distance between the second surface and the first surface is H ₂ And satisfies the following conditions: h ₂ Not less than 0.1mm. If H is ₂ < 0.1, the distance between the second surface and the first surface is small, and after the edge region is welded with the electrode terminal, there is a risk that the welded part protrudes from the first surface, and H ₂ Not less than 0.1mm, the second surface can be further away from the first surface, and the risk that the welding part protrudes out of the first surface is further reduced.

In some embodiments, the body region has a third surface facing away from the electrode assembly in the thickness direction, the third surface being the surface of the sealing member furthest from the electrode assembly; the third surface is flush with the first surface; or, the third surface is closer to the electrode assembly than the first surface. In this way, the body region does not protrude beyond the first surface, enabling a large area contact of the external component with the first surface. In addition, the third surface is flush with the first surface, and the third surface and the first surface can both be in contact with an external component, can increase the area of flow between battery cell and the external component.

In some embodiments, the sealing member is provided with a groove recessed from the third surface toward a direction close to the electrode assembly, the groove is circumferentially disposed around the body region, and the edge region is circumferentially disposed around the groove. The influence to the main part district when setting up of recess can reduce marginal zone and electrode terminal welding, and the welding stress that the welding of marginal zone and electrode terminal produced can be released to the recess, reduces the risk that the main part district warp, guarantees the planarization on third surface.

In some embodiments, the weld is a ring-shaped structure disposed around the edge region. The firmness of the welded marginal area and the electrode terminal is improved, and the sealing between the marginal area and the electrode terminal can be realized.

In some embodiments, the sealing member has a third surface facing away from and furthest from the electrode assembly in the thickness direction; the third surface is flush with the first surface; or, the third surface is closer to the electrode assembly than the first surface. In this way, the blocking element does not project beyond the first surface, so that the outer component can be brought into large-area contact with the first surface. In addition, the third surface is flush with the first surface, and the third surface and the first surface can both be in contact with external parts, can increase the area of overflowing between battery cell and external parts.

In some embodiments, the bottom surface of the first hole section is at a distance H from the first surface in the thickness direction ₃ And satisfies the following conditions: h ₃ Not less than 0.1mm. If H is ₃ Less than 0.1mm, the depth of the first hole section is shallow, there is a risk that the weld protrudes from the first surface, and H ₃ Not less than 0.1mm, the depth of the first hole section can be deeper, and the risk that the welding part protrudes out of the first surface is further reduced.

In some embodiments, the bore side of the second bore section is disposed at an angle, and the bore side of the second bore section is disposed at an obtuse angle to the bottom surface of the second bore section. The difficulty that the shutoff piece got into the second hole section is reduced, be convenient for pack the shutoff piece into the second hole section in, can improve the installation effectiveness of shutoff piece.

In some embodiments, the bore side surface of the second bore section is joined to the bottom surface of the first bore section and forms a sharp corner at the point of joining. The connection position of the hole side surface of the second hole section and the bottom surface of the first hole section is convenient for the welding equipment to identify. When the plugging piece is welded on the electrode terminal, the sharp corner can be used as a capturing position of welding equipment, and the welding equipment can determine the welding position according to the sharp corner, so that the welding efficiency and the welding quality are improved.

In some embodiments, the bore side of the second bore section is a conical surface. The conical second hole section is simple in structure and convenient to process.

In some embodiments, the outer circumferential surface of the block piece comprises an inclined surface, the inclined surface being disposed facing the bore side surface of the second bore section. This configuration enables more of the closure to be accommodated within the second bore section.

In some embodiments, in the thickness direction, the blocking piece has an abutting surface abutting against the bottom surface of the second hole section; wherein the angle between the leaning surface and the inclined surface is theta ₁ The angle formed by the side surface of the second hole section and the bottom surface of the second hole section is theta ₂ Satisfies theta ₁ ＞θ ₂ . This kind of structure makes the clearance between the hole side of second hole section and the inclined plane of shutoff piece increase along the degree of depth direction of second hole section gradually for the shutoff piece can support by in the bottom surface of second hole section, guarantees that the shutoff piece can install and targets in place.

In some embodiments, the stepped hole further includes a third hole section, the third hole section is disposed on a bottom surface of the second hole section, and the plugging member abuts against the bottom surface of the second hole section. The third hole section can reduce the thickness of the connecting area of the electrode terminal and the internal part (the pole ear or the current collecting component) of the battery cell, so that the welding of the connecting area and the internal part is convenient to realize, and the welding firmness of the connecting area and the internal part is improved.

In some embodiments, the electrode terminal has a fourth surface facing the closest electrode assembly in the thickness direction; the electrode terminal is provided with the medium filling hole, and the one end of medium filling hole extends to the fourth surface, and the other end and the shoulder hole intercommunication of medium filling hole, medium filling hole are used for injecting electrolyte to battery monomer is inside. Can conveniently pour into electrolyte into to the monomer inside of battery through the medium filling hole, after the monomer inside electrolyte that pours into of battery, can flow into the shutoff of medium filling hole through the shutoff piece with the shutoff of medium, reduce electrolyte and pass through medium filling hole to the monomer outside risk of battery.

In some embodiments, the electrode terminal includes a body part, a first stopper part, and a second stopper part; along the thickness direction, first spacing portion and second spacing portion connect respectively in the both ends of this somatic part, and this somatic part passes the wall portion, and the wall portion is located between first spacing portion and the spacing portion of second at least partially to the relative wall portion of restriction electrode terminal removes, the first surface is the surface that first spacing portion deviates from the spacing portion of second. In this way, the electrode terminal can be restrained in the radial and axial directions to fix the electrode terminal to the wall portion.

In some embodiments, the housing comprises a shell and an end cap; the casing includes integrated into one piece's lateral wall and wall portion, and the lateral wall encloses to be located around the wall portion, along thickness direction, and the wall portion sets up in the one end of lateral wall, and the other end of lateral wall forms the opening, and the end cover seals the opening. The side wall and the wall are integrally formed, the shell has better anti-damage capability, and when the electrode terminal is acted by an external part, the connecting position of the wall and the side wall is not easy to be damaged under the driving action of the electrode terminal.

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

In some embodiments, the battery includes a plurality of battery cells and a bus member, the plurality of battery cells are electrically connected through the bus member, and the bus member abuts against the first surface and is connected with the blocking piece in a welding manner. Stable overcurrent between the electrode terminals and the bus bar member is realized.

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 an exploded view of a battery provided in accordance with 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 schematic structural view of the battery cell shown in fig. 3;

fig. 5 is a partial view of the battery cell shown in fig. 4;

fig. 6 is an assembly view of the block piece and the electrode terminal shown in fig. 5;

FIG. 7 is a schematic view illustrating the structure of the electrode terminal shown in FIG. 6;

fig. 8 is a partial enlarged view of a portion a in fig. 6;

fig. 9 is a partially enlarged view (weld removed) at a in fig. 6;

FIG. 10 is a schematic view of the construction of the closure of FIG. 6;

fig. 11 is an assembly view of a block piece and electrode terminals provided in accordance with further embodiments of the present application;

fig. 12 is a schematic structural diagram of a battery cell according to another embodiment of the present application;

fig. 13 is an assembly view of the block piece and the electrode terminal shown in fig. 12;

FIG. 14 is a schematic view illustrating the structure of the electrode terminal shown in FIG. 13;

fig. 15 is a partial enlarged view at B in fig. 13;

fig. 16 is a partially enlarged view (weld removed) at B in fig. 13.

Icon: 1-a housing; 11-a housing; 111-a wall portion; 112-a side wall; 12-an end cap; 2-an electrode assembly; 21-a first tab; 22-a second tab; 3-an electrode terminal; 31-a stepped bore; 311-a first bore section; 3111-a first bottom surface; 312-a second bore section; 3121-a second bottom surface; 3122-sides of wells; 313-a third bore section; 32-a first surface; 33-a fourth surface; 34-a media injection hole; 35-a body portion; 36-a first stop; 37-a second stop; 4-a current collecting member; 5-plugging piece; 51-a body region; 511-a third surface; 52-an edge zone; 521-a second surface; 522-a first peripheral surface; 53-grooves; 54-inclined plane; 55-an abutment surface; 6-a weld; 7-a seal; 10-a battery cell; 20-a box body; 201-a first portion; 202-a second portion; 100-a battery; 200-a controller; 300-a motor; 1000-a vehicle; 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 foregoing 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.

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

In the embodiments of the present application, like reference numerals denote like components, and in the different embodiments, detailed descriptions of the like components are omitted 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 illustrative 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 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 plate comprises a negative current collector and a negative active substance layer, the negative active substance layer is coated on the surface of the negative current collector, the negative current collector which is not coated with the negative active substance layer protrudes out of the negative current collector which is coated with the negative active substance layer, and the negative current collector which is not coated with the negative active substance layer is used as a negative tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fusing does not occur through large current, the positive electrode tab is stacked in plurality, and the negative electrode tab is stacked in plurality. 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.

The electrode terminals of the battery cells generally need to be connected with external parts to output the electric power of the battery cells. For example, in a battery, a plurality of battery cells are generally electrically connected by a bus member to realize series, parallel, or series-parallel connection of the plurality of battery cells. In order to accomplish the electrical connection between the battery cells, the bus members need to be connected with the electrode terminals of the battery cells.

The inventors have noticed that, after the external member (e.g., the bus bar member) is connected to the electrode terminal, the external member may be detached from the electrode terminal, and the electric power of the battery cell may not be normally output.

In order to achieve stable overcurrent between the electrode terminal and the internal part (tab or current collecting member) of the battery cell, a hole portion may be provided in the electrode terminal to thin the electrode terminal at a region where the hole portion is provided, so as to connect the electrode terminal to the internal part, for example, to which the thinned region of the electrode terminal is welded, to achieve stable overcurrent. After the electrode terminal is connected to the internal member, it is necessary to weld a sealing material to the electrode terminal and seal the hole portion with the sealing material.

The inventors have found that, after the sealing member is welded to the electrode terminal, a welded portion generated by the welding may protrude from a surface of the electrode terminal for contact with an external member, so that a contact area of the external member after the connection with the terminal body is reduced, the external member is easily separated from the electrode terminal, and the electrical connection stability of the external member with the electrode terminal is poor.

In view of this, the present embodiment provides a battery cell, in which an electrode terminal is provided with a stepped hole, the electrode terminal has a first surface farthest from an electrode assembly, the stepped hole includes a first hole section and a second hole section that are continuously arranged, the first hole section is arranged on the first surface, and the second hole section is arranged on a side of the first hole section close to the electrode assembly. The plugging piece is at least partially positioned in the second hole section, is connected with the electrode terminal in a welding mode, and forms a welding portion at the welding position. The first bore section is configured to receive at least a portion of the weld such that the weld does not protrude beyond the first surface.

In such battery cell, the first hole section of shoulder hole can hold the welding part that shutoff piece and electrode terminal welding produced for the welding part does not bulge in electrode terminal's first surface, makes the outside part be difficult for receiving the influence of welding part when leaning on with the first surface, can increase the area of contact of outside part and first surface, has improved the fastness that outside part connects in electrode terminal, can realize outside part and electrode terminal's stable electricity and be connected.

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; the 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 tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric 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. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, and 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.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure, in which the battery 100 includes a battery cell 10 and a case 20, and the case 20 is used for accommodating the battery cell 10.

The case 20 is a component for accommodating the battery cell 10, the case 20 provides an accommodating space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first portion 201 and a second portion 202, and the first portion 201 and the second portion 202 are covered with each other to define a receiving space for receiving the battery cell 10. The first portion 201 and the second portion 202 may be a variety of shapes, such as a rectangular parallelepiped, a cylinder, and the like. The first portion 201 may be a hollow structure with one side open, the second portion 202 may also be a hollow structure with one side open, and the open side of the second portion 202 is covered on the open side of the first portion 201, so as to form the box body 20 with a receiving space. The first portion 201 may have a hollow structure with one side open, the second portion 202 may have a plate-like structure, and the second portion 202 may cover the open side of the first portion 201 to form the case 20 having the receiving space.

In the battery 100, one or more battery cells 10 may be provided. If there are a plurality of battery cells 10, the plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 10 are connected in series or in parallel. A plurality of battery cells 10 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a whole, and may be accommodated in the case 20. Or all the single batteries 10 can be directly connected in series or in parallel or in series-parallel, and the whole formed by all the single batteries 10 is accommodated in the box 20.

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 member may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

Referring to fig. 3 and 4, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the present disclosure; fig. 4 is a schematic structural view of the battery cell 10 shown in fig. 3. The battery cell 10 may include a case 1, an electrode assembly 2, and an electrode terminal 3.

The case 1 is used for accommodating the electrode assembly 2, the electrolyte, and other components, and the case 1 may include a case 11 and an end cap 12, the end cap 12 closing an opening of the case 11, and the end cap 12 and the case 11 together defining a sealed space for accommodating the electrode assembly 2, the electrolyte, and other components.

The case 11 is a member for receiving the electrode assembly 2, and the case 11 may be a hollow structure having one end opened, and the case 11 may be a hollow structure having opposite ends opened. The housing 11 may be in various shapes, such as a cylinder, a rectangular parallelepiped, or the like. The material of the housing 11 may be various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

The end cap 12 is a member that closes the opening of the case 11 to isolate the internal environment of the battery cell 10 from the external environment. The shape of the end cap 12 can be adapted to the shape of the housing 11, for example, the housing 11 is a rectangular parallelepiped structure, the end cap 12 is a rectangular plate structure adapted to the housing 11, and for example, in the embodiment shown in fig. 3 and 4, the housing 11 is a cylindrical structure, and the end cap 12 is a circular plate structure adapted to the housing 11. The end cap 12 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the end cap 12 may be the same as or different from that of the housing 11.

In the housing 1, one or two end caps 12 may be provided. For example, the housing 11 is a hollow structure with two opposite ends forming an opening, two end covers 12 may be correspondingly disposed, and the two end covers 12 respectively close the two openings of the housing 11; for another example, in the embodiment shown in fig. 3 and 4, the housing 11 is a hollow structure with one end open, and one end cap 12 may be correspondingly disposed, and one end cap 12 closes one opening of the housing 11.

The electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 2 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 2 may have a winding type structure in which the positive electrode sheet, the separator, and the negative electrode sheet are wound, or a lamination type structure in which the positive electrode sheet, the separator, and the negative electrode sheet are stacked. The electrode assembly 2 has a first tab 21 and a second tab 22, one of the first tab 21 and the second tab 22 being a positive tab, which may be a portion of the positive electrode sheet not coated with the positive active material layer, and the other being a negative tab, which may be a portion of the negative electrode sheet not coated with the negative active material layer.

The electrode terminal 3 is a part of the battery cell 10 for connecting with an external part (e.g., a bus bar part) to output electric power of the battery cell 10. The electrode terminal 3 may be attached to the case 11 or may be attached to the end cap 12.

As shown in fig. 3 and 4, taking the case 11 as a hollow structure with one open end as an example, the electrode terminal 3 may be disposed on a wall of the case 11 opposite to the end cap 12, the electrode terminal 3 being electrically connected to the first tab 21 of the electrode assembly 2, and the end cap 12 being electrically connected to the second tab 22 of the electrode assembly 2.

Of course, the electrode terminal 3 and the first tab 21 may be directly connected or indirectly connected, and the end cap 12 and the second tab 22 may be directly connected or indirectly connected. Illustratively, the electrode terminal 3 is indirectly connected to the first tab 21 via one current collecting member 4, and the end cap 12 is indirectly connected to the second tab 22 via another current collecting member 4. The electrode terminal 3 and the first tab 21 may each be welded to one current collecting member 4, and the end cap 12 and the second tab 22 may each be welded to the other current collecting member 4. The current collecting member 4 is a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, or the like, and the current collecting member 4 may have a disk shape.

Referring to fig. 5 to 7, fig. 5 is a partial view of the battery cell 10 shown in fig. 4; fig. 6 is an assembly view of the sealing member 5 and the electrode terminal 3 shown in fig. 5; fig. 7 is a schematic structural view of the electrode terminal 3 shown in fig. 6. The embodiment of the application provides a battery cell 10, including shell 1, electrode subassembly 2, electrode terminal 3 and shutoff piece 5. The case 1 has a wall portion 111, and the electrode assembly 2 is housed in the case 1. The electrode terminal 3 is disposed on the wall portion 111, the electrode terminal 3 is electrically connected with the electrode assembly 2, the electrode terminal 3 is provided with a stepped hole 31, the electrode terminal 3 has a first surface 32 facing away from and farthest from the electrode assembly 2 along a thickness direction Z of the wall portion 111, the stepped hole 31 includes a first hole section 311 and a second hole section 312 which are continuously disposed, the first hole section 311 is disposed on the first surface 32, and the second hole section 312 is disposed on a side of the first hole section 311 close to the electrode assembly 2. The plugging member 5 is at least partially positioned in the second hole section 312, the plugging member 5 is welded with the electrode terminal 3, and a welding portion 6 is formed at the welding position. Wherein the first hole section 311 is used for accommodating at least a part of the welding portion 6, so that the welding portion 6 does not protrude from the first surface 32.

The wall 111 may be the end cap 12 in the housing 1; the wall portion 111 may also be a wall in the housing 11 of the casing 1, for example, in fig. 5, the wall portion 111 is a wall in the housing 11 opposite to the end cover 12. Taking the case 1 as a cylinder as an example, the thickness direction Z of the wall portion 111 may be the axial direction of the case 1. The electrode terminal 3 is provided on the wall portion 111, and the wall portion 111 is provided with a through hole through which the electrode terminal 3 passes, and a seal 7 may be provided between the electrode terminal 3 and the wall portion 111 in order to improve the sealing property between the electrode terminal 3 and the wall portion 111.

The first surface 32 is an outer surface of the electrode terminal 3 facing away from the electrode assembly 2, the first surface 32 is also an outer surface of the electrode terminal 3 farthest from the electrode assembly 2, the first surface 32 is located outside the case 1, and the first surface 32 may be a plane. The first hole section 311 is a hole section closest to the first surface 32 in the stepped hole 31, and an end of the first hole section 311 away from the second hole section 312 extends to the first surface 32. Along the thickness direction Z, the second hole section 312 is farther from the first surface 32 than the first hole section 311. First bore section 311 and second bore section 312 may be cylindrical bore sections, conical bore sections, square bore sections, and the like.

The first and second hole sections 311 and 312 each have a bottom surface, the bottom surface of the first hole section 311 is a first bottom surface 3111, the bottom surface of the second hole section 312 is a second bottom surface 3121, and an end of the second hole section 312 away from the electrode assembly 2 extends to the first bottom surface 3111 in the thickness direction Z, and the first bottom surface 3111 is closer to the first surface 32 than the second bottom surface 3121. The first bottom surface 3111 and the second bottom surface 3121 may be plane surfaces, and the first bottom surface 3111 and the second bottom surface 3121 may be disposed in parallel.

The plugging member 5 is a member for plugging the stepped hole 31, and the plugging member 5 may be partially located in the second hole section 312 or may be entirely located in the second hole section 312. The block piece 5 may be a circular plate, a square plate, or the like. The material of the blocking piece 5 may be the same as that of the end cap 12, and the blocking piece 5 may be copper, iron, aluminum, steel, aluminum alloy, or the like.

The welded portion 6 is a portion where the plug 5 and the electrode terminal 3 are welded together after the plug 5 and the electrode terminal 3 are welded together. A welding portion 6 is a welding portion that is a welding area where the blocking piece 5 and the electrode terminal 3 are welded, and the welding area may be different in color from other areas.

The first hole section 311 functions to accommodate the weld 6, and the first hole section 311 may accommodate a part of the weld 6 and the first hole section 311 may also accommodate the entirety of the weld 6. For example, a portion of the welding portion 6 protrudes from the first bottom surface 3111, and the first hole section 311 accommodates the portion of the welding portion 6 protruding from the first bottom surface 3111. The welding part 6 does not protrude from the first surface 32, and it can be understood that the welding part 6 does not have a portion farther from the electrode assembly 2 than the first surface 32 in the thickness direction Z.

In the embodiment of the present application, the first hole section 311 of the stepped hole 31 can accommodate the welding portion 6 generated by welding the plugging member 5 and the electrode terminal 3, so that the welding portion 6 does not protrude from the first surface 32 of the electrode terminal 3, so that the external component is not easily affected by the welding portion 6 when abutting against the first surface 32, the contact area between the external component and the first surface 32 can be increased, the firmness of the external component connected to the electrode terminal 3 is improved, the stable electrical connection between the external component and the electrode terminal 3 can be realized, and the stable overcurrent between the electrode terminal 3 and the external component can be realized. The electrode terminal 3 of the battery cell 10 of such a structure has the ability to achieve stable electrical connection with external parts.

In the embodiment of the present application, the external part may be a conductive member in various structural forms, for example, a bus member for electrically connecting the plurality of battery cells 10.

Taking the welding of the bus part and the electrode terminal 3 as an example, because the welding part 6 does not protrude out of the first surface 32, the bus part can be in large-area contact with the first surface 32, the bus part is not easy to be welded with the electrode terminal 3, and the welded part has good firmness, so that the bus part and the electrode terminal 3 can stably overflow, and the bus part and the electrode terminal 3 can be stably and electrically connected.

In some embodiments, please refer to fig. 8-10, fig. 8 is a partial enlarged view of a portion a in fig. 6; fig. 9 is a partially enlarged view at a in fig. 6 (the welded portion 6 is removed); fig. 10 is a schematic structural view of the closure member 5 shown in fig. 6. The blocking member 5 includes a main body region 51 and a rim region 52, the rim region 52 is disposed around the main body region 51, and the welding portion 6 connects the rim region 52 and at least partially protrudes from the bottom surface (first bottom surface 3111) of the first hole section 311.

The main body region 51 is a central portion of the block piece 5, the edge region 52 is an edge portion of the block piece 5, the edge region 52 surrounds the main body region 51, and the edge region 52 and the main body region 51 may be integrally formed. Taking the case that the blocking piece 5 is a circular plate, the main body region 51 may be a circular region located at the center of the blocking piece 5, and the edge region 52 may be a ring-shaped region surrounding the main body region 51. The welded part 6 may partially protrude from the first bottom surface 3111 or may entirely protrude from the first bottom surface 3111, and the welded part 6 connects the marginal area 52 and the first bottom surface 3111.

The edge region 52 and the first bottom surface 3111 are connected by the welding portion 6 to fix the blocking piece 5 to the electrode terminal 3. During welding, welding can be performed along the edge of the edge area 52, and welding efficiency is improved.

In some embodiments, referring to fig. 11, fig. 11 is an assembly view of a blocking member 5 and an electrode terminal 3 according to other embodiments of the present disclosure. In the thickness direction Z, the edge region 52 has a second surface 521 facing away from and farthest from the electrode assembly 2, the second surface 521 being flush with the bottom surface (first bottom surface 3111) of the first hole section 311.

The second surface 521 is an outer surface of the edge region 52 facing away from the electrode assembly 2, the second surface 521 is also an outer surface of the edge region 52 farthest from the electrode assembly 2, the second surface 521 may be a plane, and the second surface 521 is in the same plane as the bottom surface (the first bottom surface 3111) of the first hole section 311.

In welding the edge region 52 to the electrode terminal 3, welding may be performed along a weld joint between the second surface 521 and the bottom surface (first bottom surface 3111) of the first hole section 311, so that the welded portion 6 is at least partially formed at the weld joint.

In the present embodiment, the second surface 521 is flush with the bottom surface (the first bottom surface 3111) of the first hole section 311, so that the edge region 52 does not protrude from the bottom surface (the first bottom surface 3111) of the first hole section 311, and the second surface 521 is further away from the first surface 32, so that the welding portion 6 can be further away from the first surface 32, thereby further reducing the risk that the welding portion 6 protrudes from the first surface 32.

In some embodiments, with continued reference to fig. 8 and 9, the edge region 52 has a second surface 521 facing away from and farthest from the electrode assembly 2 along the thickness direction Z, and the second surface 521 is located between the first surface 32 and the bottom surface (first bottom surface 3111) of the first hole section 311.

It can be understood that, in the thickness direction Z, the first surface 32 is farther from the electrode assembly 2 than the second surface 521, and the second surface 521 is farther from the electrode assembly 2 than the bottom surface of the first hole section 311.

In this embodiment, the second surface 521 is located between the first surface 32 and the bottom surface (the first bottom surface 3111) of the first hole section 311, so that a part of the edge area 52 protrudes from the bottom surface (the first bottom surface 3111) of the first hole section 311, and during welding, the outer contour of the edge area 52 can be identified by a welding device, and the welding efficiency and the welding quality can be improved.

In some embodiments, with continued reference to fig. 8 and 9, the edge region 52 has a first outer peripheral surface 522 connected to the second surface 521, and the welding portion 6 connects the first outer peripheral surface 522 and the bottom surface (first bottom surface 3111) of the first hole section 311.

The first outer peripheral surface 522 may extend in the thickness direction Z, and the axial direction of the first outer peripheral surface 522 coincides with the thickness direction Z, taking the first outer peripheral surface 522 as a cylindrical surface as an example. The welding portion 6 may partially protrude from the first outer circumferential surface 522, or may completely protrude from the first outer circumferential surface 522, so that the welding portion 6 is connected to the first outer circumferential surface 522. The welding portion 6 may partially protrude from the bottom surface (first bottom surface 3111) of the first hole section 311, or may completely protrude from the bottom surface (first bottom surface 3111) of the first hole section 311, so that the welding portion 6 is connected to the bottom surface (first bottom surface 3111) of the first hole section 311.

When welding, the welding equipment can determine the welding position by identifying the first outer peripheral surface 522 of the edge area 52, thereby improving the welding efficiency and the welding quality. Since the welding portion 6 connects the first outer circumferential surface 522 and the bottom surface (first bottom surface 3111) of the first hole section 311, the firmness of the connection of the edge portion 52 and the electrode terminal 3 by the welding portion 6 can be improved.

In some embodiments, with continued reference to fig. 8 and 9, the distance between the second surface 521 and the bottom surface (first bottom surface 3111) of the first hole section 311 along the thickness direction Z is H ₁ Satisfies the following conditions: h ₁ ≤0.1mm。

Distance H between second surface 521 and the bottom surface (first bottom surface 3111) of first bore section 311 ₁ Which is the height of the edge region 52 protruding from the bottom surface (first bottom surface 3111) of the first hole section 311.

H ₁ May be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc.

If H is ₁ If the distance between the second surface 521 and the bottom surface (the first bottom surface 3111) of the first hole section 311 is too large and the distance between the second surface 521 and the first surface 32 is too small, the welded portion 6 may protrude from the first surface 32 after the edge region 52 is welded to the electrode terminal 3.

In this example, H ₁ Less than or equal to 0.1mm, the second surface 521 can be further away from the first surface 32, further reducing the risk of the welding part 6 protruding from the first surface 32.

In some embodiments, with continued reference to fig. 8 and 9, the distance between the second surface 521 and the first surface 32 is H ₂ Satisfies the following conditions: h ₂ ≥0.1mm。

H ₂ And may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

If H ₂ < 0.1, the distance between the second surface 521 and the first surface 32 is small, and there is a risk that the welding portion 6 protrudes from the first surface 32 after the edge region 52 is welded to the electrode terminal 3.

In this example, H ₂ Not less than 0.1mm, the second surface 521 can be further away from the first surface 32, and the risk that the welding part 6 protrudes from the first surface 32 is further reduced.

In some embodiments, referring to fig. 8, 9 and 11, the body region 51 has a third surface 511 facing away from the electrode assembly 2 along the thickness direction Z, the third surface 511 is a surface of the blocking piece 5 farthest away from the electrode assembly 2, and the third surface 511 is flush with the first surface 32.

The third surface 511 is the outer surface of the body region 51 facing away from the electrode assembly 2, and the third surface 511 is also the outer surface of the sealing member 5 farthest from the electrode assembly 2. The third surface 511 may be a plane, and the third surface 511 and the first surface 32 are located in the same plane. The third surface 511 is farther from the electrode assembly 2 than the second surface 521 along the thickness direction Z.

In the present embodiment, the third surface 511 is flush with the first surface 32, the blocking member 5 is entirely located in the stepped hole 31, and the body region 51 does not protrude from the first surface 32, so that the external component can be in large-area contact with the first surface 32. In addition, both the third surface 511 and the first surface 32 may be in contact with an external member, enabling an increase in the flow area between the battery cell 10 and the external member.

In other embodiments, the body region 51 has a third surface 511 facing away from the electrode assembly 2 in the thickness direction Z, the third surface 511 being a surface of the sealing member 5 farthest from the electrode assembly 2, the third surface 511 being closer to the electrode assembly 2 than the first surface 32. In this way, the entire block piece 5 is located in the stepped hole 31, and the body region 51 does not protrude from the first surface 32, reducing the risk of interference between the external component and the body region 51, so that the external component can be in large-area contact with the first surface 32.

In some embodiments, referring to fig. 8, 9 and 11, the sealing member 5 is provided with a groove 53 recessed from the third surface 511 in a direction close to the electrode assembly 2, the groove 53 is circumferentially disposed around the main body region 51, and the edge region 52 is circumferentially disposed around the groove 53.

The recess 53 may be an annular groove provided on the block piece 5. In the radial direction of the blocking piece 5, the region of the blocking piece 5 located inside the groove 53 is a main body region 51, and the region located outside the groove 53 is an edge region 52. The third surface 511 of the body region 51 is connected to the second surface 521 of the edge region 52 by the groove wall surface of the groove 53. The recess 53 may be formed in a variety of ways, such as punch forming, milling, etc.

The arrangement of the groove 53 can reduce the influence on the body region 51 when the edge region 52 is welded with the electrode terminal 3, and the groove 53 can release the welding stress generated by welding the edge region 52 with the electrode terminal 3, thereby reducing the risk of deformation of the body region 51 and ensuring the flatness of the third surface 511.

In the embodiment where the third surface 511 is flush with the first surface 32, since the groove 53 ensures the flatness of the third surface 511, when the external component is in contact with the third surface 511 and is welded to the body region 51, a cold joint is not likely to occur, and the welding firmness between the external component and the body region 51 is ensured.

In some embodiments, the weld 6 is a ring-shaped structure disposed circumferentially around the edge region 52.

When the edge region 52 is welded to the electrode terminal 3, the welding may be performed along the entire circumference of the edge region 52 in the circumferential direction to correspondingly form the welding part 6 having a ring shape.

In the present embodiment, the welding portion 6 has a ring-shaped structure, so that the firmness of the welding between the edge region 52 and the electrode terminal 3 is improved, and the sealing between the edge region 52 and the electrode terminal 3 can be realized.

In some embodiments, referring to fig. 8, 9 and 11, the blocking member 5 has a third surface 511 facing away from and furthest from the electrode assembly 2 along the thickness direction Z, the third surface 511 being flush with the first surface 32.

In an embodiment where the closure 5 has a body region 51 and an edge region 52, the third surface 511 may be the surface of the body region 51 facing away from the electrode assembly 2 in the thickness direction Z.

In the present embodiment, the third surface 511 is flush with the first surface 32, the blocking member 5 is entirely located in the stepped hole 31, and the body region 51 does not protrude from the first surface 32, so that the external component can be in large-area contact with the first surface 32. In addition, both the third surface 511 and the first surface 32 may contact with an external member, enabling an increase in the flow area between the battery cell 10 and the external member.

In other embodiments, the blocking member 5 has a third surface 511 facing away from and farthest from the electrode assembly 2 in the thickness direction Z, the third surface 511 being closer to the electrode assembly 2 than the first surface 32. In this way, the entire block piece 5 is located in the stepped hole 31, and the body region 51 does not protrude from the first surface 32, reducing the risk of interference of the external component with the block piece 5, so that the external component can make large-area contact with the first surface 32.

In some embodiments, referring to fig. 8, 9 and 11, the distance H between the bottom surface (first bottom surface 3111) of the first hole section 311 and the first surface 32 along the thickness direction Z is ₃ And satisfies the following conditions: h ₃ ≥0.1mm。

The distance between the bottom surface (first bottom surface 3111) of the first hole section 311 and the first surface 32 is H ₃ Is the depth of the first bore section 311. H ₃ May be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Exemplary, H ₃ ≥0.2mm。

If H is ₃ < 0.1mm, the depth of the first bore section 311 is shallow, and there is a risk that the weld 6 protrudes from the first surface 32.

The inventors noticed that, when the plugging member 5 is welded to the electrode terminal 3, the height of the portion of the welding part 6 protruding from the bottom surface (first bottom surface 3111) of the first hole section 311 does not generally exceed 0.1mm. H ₃ Not less than 0.1mm, the depth of the first hole section 311 can be deeper, and the risk that the welding part 6 protrudes from the first surface 32 is further reduced.

In some embodiments, referring to fig. 8, 9 and 11, the hole side surface 3122 of the second hole section 312 is disposed obliquely, and the hole side surface 3122 of the second hole section 312 is disposed at an obtuse angle with respect to the bottom surface (the second bottom surface 3121) of the second hole section 312.

The bore side surface 3122 of the second bore section 312 connects the bottom surface (second bottom surface 3121) of the second bore section 312 and the bottom surface (first bottom surface 3111) of the first bore section 311. The bore side surface 3122 of the second bore section 312 may be a conical surface; the aperture side 3122 of the second aperture section 312 may also be a pyramidal surface, for example, the aperture side 3122 of the second aperture section 312 is a rectangular pyramid.

In this embodiment, the hole side surface 3122 of the second hole section 312 and the bottom surface (the second bottom surface 3121) of the second hole section 312 form an obtuse angle, which reduces the difficulty of the plugging piece 5 entering the second hole section 312, facilitates the installation of the plugging piece 5 into the second hole section 312, and can improve the installation efficiency of the plugging piece 5.

In some embodiments, referring to fig. 9, the hole side 3122 of the second hole section 312 is connected to the bottom surface (first bottom surface 3111) of the first hole section 311, and forms a sharp corner at the connection position.

The junction of the bore side 3122 of the second bore section 312 and the bottom surface of the first bore section 311 (first bottom surface 3111) forms a sharp corner, it being understood that the bore side 3122 of the second bore section 312 and the bottom surface of the first bore section 311 (first bottom surface 3111) do not transition through a rounded corner. The weld 6 is located at the connection position of the hole side surface 3122 and the bottom surface (first bottom surface 3111) of the first hole section 311.

The sharp corner of the connection location of the bore side 3122 of the second bore section 312 and the bottom surface (first bottom surface 3111) of the first bore section 311 facilitates identification by the welding device. When welding plugging piece 5 in electrode terminal 3, the closed angle can regard as welding equipment's catching position, and welding equipment can confirm welding position according to the closed angle, improves welding efficiency and welding quality.

In some embodiments, the bore side surface 3122 of the second bore section 312 is a conical surface. It will be appreciated that the second bore section 312 is a conical bore section. The conical second hole section 312 has a simple structure and is easy to process.

In some embodiments, referring to fig. 8, 9 and 11, the outer circumferential surface of the blocking piece 5 comprises an inclined surface 54, and the inclined surface 54 is disposed facing the hole side surface 3122 of the second hole section 312.

The inclined surface 54 may be parallel to the hole side surface 3122 of the second hole section 312, or may be at a small angle, for example, an angle of 3 °, 5 °, 8 °, or 10 °. It should be noted that the angle between the inclined surface 54 and the aperture side surface 3122 of the second aperture section 312 is not more than 10 °, and it should be understood that the inclined surface 54 faces the aperture side surface 3122 of the second aperture section 312.

In the embodiment where the edge region 52 of the block piece 5 has the first outer circumferential surface 522, the first outer circumferential surface 522 is connected to the inclined surface 54, and both the first outer circumferential surface 522 and the inclined surface 54 are part of the outer circumferential surface of the block piece 5.

In the present embodiment, the inclined surface 54 is disposed facing the hole side surface 3122 of the second hole section 312, and this structure enables more part of the block piece 5 to be accommodated within the second hole section 312.

In some embodiments, the blocking piece 5 has an abutment surface 55 along the thickness direction Z, and the abutment surface 55 abuts against the bottom surface (second bottom surface 3121) of the second hole section 312. Wherein, the angle between the abutting surface 55 and the inclined surface 54 is θ ₁ The aperture side surface 3122 of the second aperture section 312 forms an angle θ with the bottom surface (the second bottom surface 3121) of the second aperture section 312 ₂ Satisfies theta ₁ ＞θ ₂ 。

The abutting face 55 is a surface of the abutting member for contact with the bottom surface (the second bottom surface 3121) of the second hole section 312, the abutting face 55 may be a surface of the abutting member closest to the electrode assembly 2 in the thickness direction Z, and the abutting face 55 may be a flat surface connected to the inclined surface 54.

90°＜θ ₁ ＜180°，θ ₁ Can be 100 °, 110 °, 120 °, 130 °, 135 °, 140 °, 150 °, 160 °, 170 °, etc.; theta is less than 90 DEG ₂ ＜180°，θ ₂ May be 100 °, 110 °, 120 °, 130 °, 135 °, 140 °, 150 °, 160 °, 170 °, etc. Theta ₁ May be compared with theta ₂ 1 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, 8 °, 9 °, 10 °, etc.

In the present embodiment, θ ₁ ＞θ ₂ So that the gap between the bore side surface 3122 of the second bore section 312 and the inclined surface 54 of the closing off piece 5 is alongThe depth direction of the second hole section 312 gradually increases, so that the plugging member 5 can abut against the bottom surface (the second bottom surface 3121) of the second hole section 312, and the plugging member 5 can be installed in place.

In some embodiments, please refer to fig. 12-16, fig. 12 is a schematic structural diagram of a battery cell 10 according to another embodiment of the present disclosure; fig. 13 is an assembly view of the plugging member 5 and the electrode terminal 3 shown in fig. 12; fig. 14 is a schematic structural view of the electrode terminal 3 shown in fig. 13; fig. 15 is a partial enlarged view at B in fig. 13; fig. 16 is a partially enlarged view of B in fig. 13 (the welded portion 6 is removed). The stepped hole 31 further includes a third hole section 313, the third hole section 313 is disposed on the bottom surface (the second bottom surface 3121) of the second hole section 312, and the blocking piece 5 abuts against the bottom surface (the second bottom surface 3121) of the second hole section 312.

One end of the third hole section 313 remote from the electrode assembly 2 extends to the bottom surface (second bottom surface 3121) of the second hole section 312 in the thickness direction Z. The third bore section 313 may be a cylindrical bore section, a conical bore section, a square bore section, or the like. Illustratively, the minimum aperture of the first bore section 311 is greater than the maximum aperture of the second bore section 312, and the minimum aperture of the second bore section 312 is greater than the maximum aperture of the third bore section 313. In the embodiment shown in fig. 14, the first bore section 311 and the second bore section 312 are both conical bore sections and the third bore section 313 is a cylindrical bore section.

When forming the stepped hole 31, a first hole section 311 may be formed on the first surface 32; then, forming a second hole section 312 on the bottom surface (first bottom surface 3111) of the first hole section 311; the third hole section 313 is formed on the bottom surface (second bottom surface 3121) of the second hole section 312.

The abutment surface 55 of the block piece 5 abuts against the bottom surface (the second bottom surface 3121) of the second hole section 312, and the block piece 5 covers the third hole section 313.

The third hole section 313 can reduce the thickness of the connection region of the electrode terminal 3 for the internal component of the battery cell 10, so that the connection region and the internal component can be welded conveniently, and the welding firmness of the connection region and the internal component can be improved. Exemplarily, in fig. 12, the internal component is the current collecting member 4 connecting the electrode terminal 3 and the first tab 21.

In some embodiments, with continued reference to fig. 14, the electrode terminal 3 has a fourth surface 33 facing closest to the electrode assembly 2 in the thickness direction Z. The electrode terminal 3 is provided with a medium injection hole 34, one end of the medium injection hole 34 extends to the fourth surface 33, the other end of the medium injection hole 34 communicates with the stepped hole 31, and the medium injection hole 34 is used for injecting an electrolyte into the battery cell 10.

The fourth surface 33 is an inner surface of the electrode terminal 3 facing the electrode assembly 2, the fourth surface 33 is also an inner surface of the electrode terminal 3 closest to the electrode assembly 2, the fourth inner surface is located inside the case 1, and the fourth inner surface may be a plane. The fourth surface 33 and the first surface 32 are both end surfaces of the electrode terminal 3, respectively, in the thickness direction Z. The fourth surface 33 may abut against an internal component located inside the battery cell 10, and the fourth surface 33 may abut against the current collecting member 4, for example, the electrode terminal 3 and the first tab 21 are connected through the current collecting member 4.

The medium injection hole 34 may be a cylindrical hole, a conical hole, a square hole, or the like. The medium injection hole 34 serves to communicate the stepped hole 31 with the inside of the battery cell 10. In the embodiment where the stepped hole 31 includes only the first hole section 311, the second hole section 312, the medium injection hole 34 communicates with the second hole section 312; as shown in fig. 14, in an embodiment in which the stepped hole 31 includes a first hole section 311, a second hole section 312, and a third hole section 313, the medium injection hole 34 may communicate with the third hole section 313. Of course, the medium injection hole 34 and the third hole section 313 may be directly connected or indirectly connected through another hole section.

In this embodiment, the electrolyte can be conveniently injected into the battery cell 10 through the medium injection hole 34, and after the electrolyte is injected into the battery cell 10, the medium injection hole 34 can be blocked by the blocking piece 5, so that the risk that the electrolyte flows to the outside of the battery cell 10 through the medium injection hole 34 is reduced.

It should be noted that the blocking piece 5 may extend into the medium injection hole 34 and form a seal to block the medium injection hole 34. The blocking member 5 may not extend into the medium injection hole 34, and the blocking member 5 may seal any hole segment of the stepped hole 31, thereby blocking the medium injection hole 34. For example, the plugging member 5 partially extends into the second hole section 312, and the plugging member 5 and the electrode terminal 3 are welded to form a sealing connection, so as to plug the medium injection hole 34 by the plugging member 5.

In some embodiments, the electrode terminal 3 includes a body part 35, a first stopper part 36, and a second stopper part 37. Along the thickness direction Z, the first position-limiting portion 36 and the second position-limiting portion 37 are respectively connected to two ends of the main body 35, the main body 35 passes through the wall portion 111, the wall portion 111 is at least partially located between the first position-limiting portion 36 and the second position-limiting portion 37 to limit the electrode terminal 3 from moving relative to the wall portion 111, and the first surface 32 is a surface of the first position-limiting portion 36 departing from the second position-limiting portion 37.

The body portion 35, the first stopper portion 36, and the second stopper portion 37 may be an integrally molded structure. The main body portion passes through the through hole of the wall portion 111, the first position-limiting portion 36 is located outside the housing 1, and the second position-limiting portion 37 is located inside the housing 11. The body 35, the first stopper 36, and the second stopper 37 form a caulking structure to be caulked to the wall 111. The main body 35, the first position-limiting part 36 and the second position-limiting part 37 may be coaxially disposed cylindrical structures, and the diameter of the first position-limiting part 36 and the diameter of the second position-limiting part 37 are both larger than the diameter of the main body 35.

The first stopper portion 36 is used for connection with an external part, and the second stopper portion 37 is used for electrical connection of the electrode assembly 2. Taking the case where the electrode terminal 3 is connected to the first tab 21 through the current collecting member 4 and the stepped hole 31 has the third hole section 313, the second limiting portion 37 abuts against the current collecting member 4, and the region of the electrode terminal 3 at the bottom of the third hole section 313 may be used for welding with the current collecting member 4.

In the present embodiment, the body portion 35 penetrates the wall portion 111, and the wall portion 111 is at least partially located between the first limiting portion 36 and the second limiting portion 37, so that the electrode terminal 3 can be limited in the radial direction and the axial direction to fix the electrode terminal 3 to the wall portion 111.

In some embodiments, with continued reference to fig. 12, the housing 1 includes a shell 11 and an end cap 12. The housing 11 includes a side wall 112 and a wall portion 111 that are integrally formed, the side wall 112 is provided around the wall portion 111, the wall portion 111 is provided at one end of the side wall 112 in the thickness direction Z, the other end of the side wall 112 forms an opening, and the end cap 12 closes the opening.

The end cap 12 and the housing 11 may be connected in a variety of ways, such as welding, crimping. The housing 11 may be formed by punching, stretch forming, or the like, to form the side wall 112 and the wall 111 integrally. Illustratively, the housing 11 is of cylindrical configuration and the end cap 12 is of circular configuration.

The side wall 112 and the wall 111 are integrally formed, the housing 1 has better anti-damage capability, and when the electrode terminal 3 is acted by an external component, the connecting position of the wall 111 and the side wall 112 is not easy to be damaged under the driving action of the electrode terminal 3.

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

In some embodiments, the battery 100 includes a plurality of battery cells 10 and a bus member, the plurality of battery cells 10 being electrically connected by the bus member, the bus member abutting against the first surface 32 and being welded to the block piece 5. Stable overcurrent between the electrode terminals 3 and the bus bar member is achieved.

In other embodiments, the bus member may abut against the first surface 32 and be welded to the electrode terminal 3.

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

In addition, referring to fig. 12 to 16, an embodiment of the present application provides a cylindrical battery cell including a case 1, an electrode assembly 2, an electrode terminal 3, a current collecting member 4, a blocking member 5, and a sealing member 7. The housing 1 includes a case 11 and an end cap 12. The housing 11 includes a side wall 112 and a wall portion 111 which are integrally formed, the side wall 112 is provided around the wall portion 111, the wall portion 111 is provided at one end of the side wall 112 along the thickness direction Z of the wall portion 111, the other end of the side wall 112 forms an opening, and the end cover 12 closes the opening. The electrode terminal 3 is crimped to the wall 111. The packing 7 is disposed between the electrode terminal 3 and the wall portion 111, and the packing 7 serves to achieve the sealed connection between the electrode terminal 3 and the wall portion 111. An electrode assembly 2 is accommodated in the housing 1, the electrode assembly 2 having a first tab 21 and a second tab 22, the first tab 21 being connected to the electrode terminal 3 via one current collecting member 4, the first tab 21 and the electrode terminal 3 being welded to the current collecting member 4, and the second tab 22 being connected to the end cap 12 via another current collecting member 4.

Wherein the electrode terminal 3 is provided with a stepped hole 31, the electrode terminal 3 having a first surface 32 facing away from and furthest from the electrode assembly 2 in a thickness direction Z of said wall portion 111, the stepped hole 31 comprising a first hole section 311, a second hole section 312 and a third hole section 313 arranged in succession. The blocking member 5 is at least partially located in the second hole section 312, the blocking member 5 comprises a body region 51 and an edge region 52, and the edge region 52 is circumferentially arranged around the body region 51. The edge portion 52 is welded to the electrode terminal 3, and a welding portion 6 is formed at the welding position, the welding portion 6 is a ring-shaped structure surrounding the edge portion 52, and the welding portion 6 is connected to the edge portion 52 and protrudes at least from a bottom surface (first bottom surface 3111) of the first hole portion 311. The first hole section 311 is for accommodating at least a portion of the weld 6 such that the weld 6 does not protrude from the first surface 32.

Along the thickness direction Z, the edge region 52 has a second surface 521 facing away from and farthest from the electrode assembly 2, the second surface 521 being located between the first surface 32 and the bottom surface (first bottom surface 3111) of the first hole section 311. The edge region 52 has a first outer circumferential surface 522 connected to the second surface 521, and the welding portion 6 connects the first outer circumferential surface 522 and the bottom surface (first bottom surface 3111) of the first hole section 311. The distance between the second surface 521 and the bottom surface (first bottom surface 3111) of the first hole section 311 in the thickness direction Z is H ₁ The distance between the second surface 521 and the first surface 32 is H ₂ The distance between the bottom surface (first bottom surface 3111) of the first hole section 311 and the first surface 32 is H ₃ ，H ₁ ≤0.1mm，H ₂ ≥0.1mm，H ₃ ≥0.1mm。

The body region 51 has a third surface 511 facing away from the electrode assembly 2 in the thickness direction Z, the third surface 511 being the surface of the sealing member 5 furthest from the electrode assembly 2, the third surface 511 being flush with the first surface 32. The blocking member 5 is provided with a groove 53 depressed from the third surface 511 toward a direction close to the electrode assembly 2, the groove 53 is circumferentially disposed around the body region 51, and the edge region 52 is circumferentially disposed around the groove 53.

The hole side surface 3122 of the second hole section 312 is a conical surface, and the hole side surface 3122 of the second hole section 312 is disposed at an obtuse angle to the bottom surface (the second bottom surface 3121) of the second hole section 312. Outer periphery of the block piece 5The surfaces include an abutting surface 55 connected to the first outer peripheral surface 522, the abutting surface 55 abuts against the bottom surface (second bottom surface 3121) of the second hole section 312, and the abutting surface 55 and the inclined surface 54 form an angle θ ₁ The aperture side surface 3122 of the second aperture section 312 forms an angle θ with the bottom surface (the second bottom surface 3121) of the second aperture section 312 ₂ Satisfies theta ₁ ＞θ ₂ 。

The electrode terminal 3 has a fourth surface 33 facing and closest to the electrode assembly 2 in the thickness direction Z, the electrode terminal 3 is provided with a medium injection hole 34, one end of the medium injection hole 34 extends to the fourth surface 33, the other end of the medium injection hole 34 communicates with the stepped hole 31, and the medium injection hole 34 is used to inject an electrolyte into the battery cell 10.

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 (24)

1. A battery cell, comprising:

a housing having a wall portion;

an electrode assembly housed within the case;

the electrode terminal is arranged on the wall portion and is electrically connected with the electrode assembly, the electrode terminal is provided with a stepped hole, the electrode terminal is provided with a first surface which is far away from and farthest away from the electrode assembly along the thickness direction of the wall portion, the stepped hole comprises a first hole section and a second hole section which are continuously arranged, the first hole section is arranged on the first surface, and the second hole section is arranged on one side, close to the electrode assembly, of the first hole section;

a plugging member at least partially located in the second hole section, the plugging member being welded to the electrode terminal and forming a welding portion at a welding position;

wherein the first bore section is configured to receive at least a portion of the weld such that the weld does not protrude beyond the first surface.

2. The battery cell as recited in claim 1, wherein the blocking member comprises a body region and an edge region, the edge region is disposed around the body region, and the welding portion is connected to the edge region and at least partially protrudes from the bottom surface of the first hole section.

3. The battery cell as recited in claim 2 wherein the edge region has a second surface facing away from and furthest from the electrode assembly in the thickness direction, the second surface being flush with the bottom surface of the first hole segment.

4. The battery cell of claim 2, wherein the edge region has a second surface facing away from and furthest from the electrode assembly in the thickness direction, the second surface being located between the first surface and the bottom surface of the first hole segment.

5. The battery cell as recited in claim 4 wherein the edge region has a first outer peripheral surface contiguous with the second surface, and the weld connects the first outer peripheral surface and the bottom surface of the first bore section.

6. The battery cell as recited in claim 4 wherein the second surface is spaced from the bottom surface of the first hole segment by a distance H in the thickness direction ₁ Satisfies the following conditions: h ₁ ≤0.1mm。

7. The battery cell of claim 3, wherein the distance between the second surface and the first surface is H ₂ And satisfies the following conditions: h ₂ ≥0.1mm。

8. The battery cell according to claim 2, wherein the body region has a third surface facing away from the electrode assembly in the thickness direction, the third surface being a surface of the closure furthest from the electrode assembly; the third surface is flush with the first surface; or, the third surface is closer to the electrode assembly than the first surface.

9. The battery cell as recited in claim 8, wherein the blocking member is provided with a groove recessed from the third surface in a direction close to the electrode assembly, the groove is circumferentially disposed around the body region, and the edge region is circumferentially disposed around the groove.

10. The battery cell as recited in claim 2 wherein the weld is a ring-shaped structure disposed around the edge region.

11. The battery cell according to any one of claims 1-10, wherein in the thickness direction, the blocking member has a third surface facing away from and furthest from the electrode assembly;

the third surface is flush with the first surface; or, the third surface is closer to the electrode assembly than the first surface.

12. The battery cell of any of claims 1-10, wherein the bottom surface of the first hole segment is a distance H from the first surface in the thickness direction ₃ Satisfies the following conditions: h ₃ ≥0.1mm。

13. The battery cell as recited in any one of claims 1-10, wherein the hole side surface of the second hole section is disposed obliquely, and the hole side surface of the second hole section is disposed at an obtuse angle with the bottom surface of the second hole section.

14. The battery cell as recited in claim 13 wherein the aperture side surface of the second aperture section is connected to the bottom surface of the first aperture section and forms a sharp corner at the location of the connection.

15. The battery cell as recited in claim 14 wherein the aperture side of the second aperture segment is a conical surface.

16. The battery cell as recited in claim 13, wherein the outer circumferential surface of the blocking member includes an inclined surface disposed to face the hole side surface of the second hole section.

17. The battery cell according to claim 16, wherein in the thickness direction, the blocking member has an abutting surface that abuts against a bottom surface of the second hole section;

wherein the angle formed by the abutting surface and the inclined surface is theta ₁ The angle formed by the side surface of the second hole section and the bottom surface of the second hole section is theta ₂ Satisfies theta ₁ ＞θ ₂ 。

18. The battery cell as recited in any one of claims 1-10, wherein the stepped bore further comprises a third bore section disposed at a bottom surface of the second bore section, the blocking member abutting against the bottom surface of the second bore section.

19. The battery cell according to any one of claims 1 to 10, wherein the electrode terminal has a fourth surface facing and closest to the electrode assembly in the thickness direction;

the electrode terminal is provided with a medium injection hole, one end of the medium injection hole extends to the fourth surface, the other end of the medium injection hole is communicated with the stepped hole, and the medium injection hole is used for injecting electrolyte into the battery monomer.

20. The battery cell according to any one of claims 1 to 10, wherein the electrode terminal comprises a body portion, a first stopper portion, and a second stopper portion;

the first limiting portion and the second limiting portion are connected to two ends of the body portion respectively along the thickness direction, the body portion penetrates through the wall portion, at least part of the wall portion is located between the first limiting portion and the second limiting portion to limit the electrode terminal to move relative to the wall portion, and the first surface is a surface of the first limiting portion, which deviates from the second limiting portion.

21. The battery cell of any of claims 1-10, wherein the housing comprises a housing body and an end cap;

the casing include integrated into one piece's lateral wall with the wall portion, the lateral wall encloses to be located around the wall portion, follows the thickness direction, the wall portion set up in the one end of lateral wall, the other end of lateral wall forms the opening, the end cover seals the opening.

22. A battery comprising a cell according to any one of claims 1 to 21.

23. The battery of claim 22, wherein the battery comprises a plurality of battery cells and a bus member, wherein the plurality of battery cells are electrically connected by the bus member, and wherein the bus member abuts against the first surface and is welded to the sealing member.

24. An electrical device comprising the battery of claim 22 or 23.

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