Adapter, battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, an adapter, a battery device and electric equipment. Wherein the battery monomer comprises a shell, an electrode assembly, an adapter and an end cover, and the shell is provided with a first accommodating space and an opening communicated with the first accommodating space; the electrode assembly is arranged in the first accommodating space; the adapter is arranged in the first accommodating space and is connected with a tab of the electrode assembly; the end cover is connected to the shell and seals the opening, and the end cover is provided with an electrode terminal connected with the adapter; wherein the adapter is provided with a first connecting surface and a second connecting surface which are arranged along a first direction and are arranged back to back, the first connecting surface comprises a connecting groove, colloid is arranged in the connecting groove, the first connecting surface is also connected with the tab, the second connecting surface comprises a first welding area, and the first welding area is configured to be connected with the electrode terminal; wherein in the first direction, the connecting groove and the first welding area are at least partially overlapped. Through the mode, the risk that metal flying chips fall into the electrode assembly can be reduced, and the reliability of the battery monomer and the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a connector, a battery monomer, a battery device and an electrical equipment. BACKGROUND

[0002] With the development of battery technology, battery devices are applied to more and more fields, and gradually replace traditional petrochemical energy in the field of automobile power and the like. The battery device can store chemical energy and controllably convert the chemical energy into electrical energy. In the recyclable battery device, after discharging, the active material can be activated by charging to continue to be used.

[0003] In the related art, the connector in the battery monomer will fall off the welding waste such as metal spatter generated in the process of welding with the tab and the electrode terminal. These metal spatters will fall into the electrode assembly, which is easy to cause the safety hazard of short circuit and failure in the battery device and the like. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a connector, a battery monomer, a battery device and an electrical equipment to reduce the risk of metal spatter falling into the electrode assembly, thereby improving the reliability of the battery monomer and the battery device.

[0005] In a first aspect, the application provides a battery cell, which comprises a shell, an electrode assembly, an adapter, and an end cover. The shell has a first accommodating space and an opening communicating with the first accommodating space. The electrode assembly is arranged in the first accommodating space. The adapter is arranged in the first accommodating space and connected with a tab of the electrode assembly. The end cover is connected with the shell and seals the opening, and the end cover is provided with an electrode terminal connected with the adapter. The adapter is provided with a first connecting surface and a second connecting surface arranged in a first direction and opposite to each other. The first connecting surface comprises a connecting groove, and the connecting groove is provided with a glue. The first connecting surface is further connected with the tab. The second connecting surface comprises a first welding area configured to connect the electrode terminal. In the first direction, the connecting groove and the first welding area at least partially overlap. The connecting groove comprises a first groove segment and a second groove segment arranged in the first direction and communicating with each other. The first groove segment is arranged close to a groove opening of the connecting groove. The inner diameter of the first groove segment is smaller than that of the second groove segment, so as to form a convex surface at the connection between the first groove segment and the second groove segment. The adapter can electrically connect the tab of the battery cell with the electrode terminal of the battery cell. The first connecting surface and the second connecting surface are arranged in the first direction and opposite to each other, which can realize the separate welding of the adapter, the tab, and the electrode terminal. The glue in the connecting groove can collect, cover, and bond the welding metal spatter generated in the welding process, fix the metal spatter in the connecting groove, and prevent the metal spatter from falling into the interior of the electrode assembly to cause the safety hazard of internal short circuit and failure of the battery device. The first groove segment is arranged close to the groove opening of the connecting groove, and the inner diameter of the first groove segment is smaller than that of the second groove segment, which can make the inner diameter of the groove opening of the connecting groove smaller than that of the groove, reduce the risk of the metal spatter falling off from the connecting groove, and further reduce the risk of the metal spatter falling into the interior of the electrode assembly to cause the safety hazard of internal short circuit and failure of the battery device. The design of the convex surface can increase the space in the connecting groove, increase the contact area between the glue and the groove wall, and further realize the more sufficient bonding of the glue and the metal spatter in the connecting groove. The design of the convex surface can also improve the connection stability of the glue and the groove wall, reduce the risk of the glue falling off from the connecting groove under the condition of long-term immersion in electrolyte, and reduce the risk of the glue falling off from the connecting groove under the action of external force, thereby improving the reliability of the battery cell and the battery device.

[0006] In some embodiments, the convex surface is perpendicular to the first direction. Arranging the convex surface perpendicular to the first direction can better prevent the metal spatter and other welding waste from falling out of the connecting groove. This structure can also hold the glue in the connecting groove, prevent the glue from falling off, reduce the risk of the glue falling off from the connecting groove under the condition of long-term immersion in electrolyte, and has a long-term effective fixing effect.

[0007] In some embodiments, the inner side wall of the first groove segment and / or the inner side wall of the second groove segment is arranged in parallel with the first direction. This structure is simpler and can reduce the cost and facilitate the production and assembly. In an application scenario, the inner side wall of the first groove segment is arranged perpendicularly to the boss surface, which can improve the blocking effect of the boss surface on the welding spatter falling into the connecting groove and reduce the risk of the welding spatter falling out of the connecting groove.

[0008] In some embodiments, the boss surface is an annular boss surface. This arrangement can achieve 360-degree full-range blocking of the metal spatter and other welding waste located in the second groove segment and can achieve 360-degree full-range blocking of the glue in the connecting groove to prevent the glue from falling off and reduce the risk of the metal spatter falling out of the connecting groove.

[0009] In some embodiments, the annular boss surface, the first groove segment, and the second groove segment are coaxially arranged. This structure is simple and facilitates grooving, and the coaxial arrangement can make the annular boss surface have a uniform width, achieving uniform support force of 360 degrees on the glue in the groove to prevent the glue from falling off.

[0010] In some embodiments, the first dimension of the first groove segment along the first direction is less than or equal to the second dimension of the second groove segment along the first direction. When the first dimension is less than the second dimension, it is more convenient to dispense glue into the second groove segment, so that the glue covers the entire second groove segment; the second groove segment has a larger second dimension, which can store and collect more metal spatter and other welding waste, and the second groove segment is deeper, which can accommodate more glue, thereby being able to bond more welding metal spatter and also reducing the risk of the metal spatter and other welding waste falling out of the connecting groove. When the first dimension is equal to the second dimension, the first groove segment and the second groove segment have the same depth, which is convenient for processing.

[0011] In some embodiments, the first ratio of the first dimension to the second dimension is 20%-100%. This arrangement can further reduce the risk of the metal spatter and other welding waste falling out of the connecting groove.

[0012] In some embodiments, the first ratio is 30%-70%. This arrangement can further reduce the risk of the metal spatter and other welding waste falling out of the connecting groove.

[0013] In some embodiments, the second ratio of the first cross-sectional width of the first groove segment along the second direction to the second cross-sectional width of the second groove segment along the second direction is 30%-80%, and the second direction is perpendicular to the first direction. This arrangement is conducive to bonding the metal spatter that falls during welding, effectively avoiding the risk of short circuit inside the battery monomer.

[0014] In some embodiments, the second ratio is 40%-50%. This arrangement can be more conducive to bonding the metal spatter that falls during welding, effectively avoiding the risk of short circuit inside the battery monomer.

[0015] In some embodiments, the first connecting surface and the second connecting surface are two parallel planes. The two parallel planes can reduce the occupied space of the adapter, reduce the size of the battery cell, and have a simple structure.

[0016] In some embodiments, the second connecting surface further comprises a peripheral region of the first welding area, and the first welding area is arranged in a staggered manner with the peripheral region along the first direction. This arrangement can facilitate the welding of the adapter and the electrode terminal.

[0017] In some embodiments, the first connecting surface is arranged in a plane, and the first welding area is arranged away from the first connecting surface along the first direction relative to the peripheral region, and the projection of the first welding area towards the first connecting surface covers the connecting groove. The first connecting surface is a plane, and the second connecting surface comprises the protruding first welding area, which facilitates the welding with the electrode terminal; the projection of the first welding area towards the first connecting surface covers the connecting groove, which can improve the collection effect of the connecting groove on welding waste such as welding spatter during welding, and reduce the risk of welding spatter falling out of the connecting groove and entering the interior of the battery cell.

[0018] In some embodiments, the first connecting surface further comprises a second welding area, and the second welding area is welded with the tab; the region where the connecting groove is located is arranged in a staggered manner with the second welding area along the first direction, and the first welding area is arranged in a staggered manner with the peripheral region. In the first direction, the region where the connecting groove is located is arranged in a staggered manner with the second welding area, and the first welding area is arranged in a staggered manner with the peripheral region, which can provide separate welding planes for the second welding area and the first welding area, and improve the welding firmness.

[0019] In some embodiments, the second welding area and the first welding area are located in the same plane perpendicular to the first direction. After the welding of the second welding area with the tab and the welding of the first welding area with the electrode terminal are completed, this arrangement can reduce the space occupied by the adapter, and thus can improve the structural compactness of the battery cell.

[0020] In a second aspect, the application provides a connector for a battery cell, the connector being provided with a first connecting surface and a second connecting surface arranged in a first direction and oppositely, the first connecting surface comprising a connecting groove and connecting a tab of the battery cell, the second connecting surface comprising a first welding area configured to connect an electrode terminal of the battery cell, wherein the connecting groove and the first welding area at least partially overlap in the first direction, the connecting groove comprising a first groove segment and a second groove segment arranged in the first direction and connected, the first groove segment being arranged close to a groove opening of the connecting groove, and the inner diameter of the first groove segment being smaller than that of the second groove segment to form a convex surface at the connection of the first groove segment and the second groove segment. The connector can electrically connect the tab of the battery cell and the electrode terminal of the battery cell, the first connecting surface and the second connecting surface arranged in the first direction and oppositely, which can realize the separate welding of the connector, the tab and the electrode terminal, and the connecting groove is provided with a glue body, which can collect, cover and bond the welding metal spatter generated during the welding process, fix the metal spatter in the connecting groove, and prevent the metal spatter from falling into the interior of the electrode assembly to cause the safety hazard of internal short circuit and failure of the battery device. The first groove segment is arranged close to the groove opening of the connecting groove, and the inner diameter of the first groove segment is smaller than that of the second groove segment, which can make the inner diameter of the groove opening of the connecting groove smaller than that of the groove of the connecting groove, and reduce the risk of the metal spatter falling off from the connecting groove. The inner diameter of the first groove segment is smaller than that of the second groove segment, which can form a convex surface at the connection of the first groove segment and the second groove segment, and the design of the convex surface can further reduce the risk of the metal spatter entering the first groove segment from the second groove segment, thereby further reducing the safety hazard of the metal spatter falling off from the connecting groove into the interior of the electrode assembly to cause internal short circuit and failure of the battery device. The design of the convex surface can increase the space in the connecting groove, increase the contact area of the glue body and the groove wall in the connecting groove, and further enable the glue body and the metal spatter in the connecting groove to be more fully bonded. The design of the convex surface can also improve the connection stability of the glue body and the groove wall, reduce the risk of the glue body falling off from the connecting groove under the condition of long-term immersion in electrolyte, reduce the risk of the glue body falling off from the connecting groove under the action of external force, and thereby improve the reliability of the battery cell and the battery device.

[0021] In some embodiments, the convex surface is perpendicular to the first direction; the inner side wall of the first groove segment and / or the inner side wall of the second groove segment is arranged parallel to the first direction. The convex surface is arranged perpendicular to the first direction, which can better prevent welding waste such as metal spatter from falling out of the connecting groove; and this structure can hold the gel in the connecting groove, preventing the gel from falling out, reducing the risk of the gel falling out of the connecting groove under long-term electrolyte immersion, and having a long-term effective fixing effect; this structure is simpler and can reduce costs and facilitate production and assembly. In an application scenario, the inner side wall of the first groove segment is arranged perpendicular to the convex surface, which can improve the blocking effect of the convex surface on the spatter falling into the connecting groove during welding, and reduce the risk of spatter falling out of the connecting groove.

[0022] In some embodiments, the convex surface is an annular convex surface; the annular convex surface, the first groove segment, and the second groove segment are coaxially arranged. This arrangement can achieve 360-degree full-circle blocking of welding waste such as metal spatter located in the second groove segment, and can achieve 360-degree full-circle blocking of the gel in the connecting groove, preventing the gel from falling out and reducing the risk of metal spatter falling out of the connecting groove; this structure is simple and facilitates grooving, and coaxial arrangement can make the annular convex surface a uniform-width annular shape, achieving uniform support force on the gel in the groove and preventing the gel from falling out.

[0023] In some embodiments, the first dimension of the first groove segment along the first direction is less than or equal to the second dimension of the second groove segment along the first direction. When the first dimension is less than the second dimension, it is more convenient to dispense glue into the second groove segment, so that the gel covers the entire second groove segment; the second dimension of the second groove segment is larger, which can store and collect more welding waste such as metal spatter, and the second groove segment is deeper, which can accommodate more glue, thereby being able to bond more welding metal spatter, and also reducing the risk of welding waste such as metal spatter falling out of the connecting groove. When the first dimension is equal to the second dimension, the first groove segment and the second groove segment have the same depth, which is convenient for processing.

[0024] In some embodiments, the second ratio of the first cross-sectional width of the first groove segment along the second direction to the second cross-sectional width of the second groove segment along the second direction is 30%-80%, and the second direction is perpendicular to the first direction. This arrangement is conducive to bonding the metal spatter that falls during welding, effectively avoiding the risk of short circuit in the battery monomer.

[0025] In a third aspect, the application provides a battery device, comprising: the battery cell according to any one of the above embodiments. The adapter is capable of electrically connecting the tab of the battery cell and the electrode terminal of the battery cell; the first connecting surface and the second connecting surface are arranged in the first direction and are oppositely arranged, and are capable of realizing the separate welding of the adapter, the tab and the electrode terminal; the connecting groove is provided with a glue body, capable of realizing the collection, covering and adhesion of the welding metal spatter generated in the welding process, capable of fixing the metal spatter in the connecting groove, preventing the metal spatter from falling into the inside of the electrode assembly to cause the safety hazard of internal short circuit and failure of the battery device; wherein the first groove segment is arranged close to the slot opening of the connecting groove, and the inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, capable of making the inner diameter of the slot opening of the connecting groove smaller than the inner diameter of the connecting groove, reducing the risk of the metal spatter falling off from the connecting groove; wherein the inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, capable of forming a convex surface at the connection between the first groove segment and the second groove segment, the design of the convex surface can further reduce the risk of the metal spatter entering the first groove segment from the second groove segment, thus further reducing the risk of the metal spatter falling off from the connecting groove and falling into the inside of the electrode assembly, thereby causing the safety hazard of internal short circuit and failure of the battery device; and the design of the convex surface can increase the space in the connecting groove, increase the contact area of the glue body in the connecting groove and the groove wall, thereby realizing more sufficient adhesion of the glue body and the metal spatter in the connecting groove; and the design of the convex surface can also improve the connection stability of the glue body and the groove wall, reduce the risk of the glue body falling off from the connecting groove under the condition of long-time immersion in electrolyte, reduce the risk of the glue body falling off from the connecting groove under the action of external force, thereby improving the reliability of the battery cell and the battery device.

[0026] In a fourth aspect, the application provides a battery device, which comprises the battery device described above. The adapter is capable of electrically connecting the tab of the battery cell and the electrode terminal of the battery cell; the first connecting surface and the second connecting surface are arranged in the first direction and are oppositely arranged, and are capable of realizing the separate welding of the adapter and the tab and the electrode terminal; the connecting groove is provided with a glue body, which is capable of collecting, covering and bonding the welding metal spatter generated in the welding process, and is capable of fixing the metal spatter in the connecting groove, preventing the metal spatter from falling into the inside of the electrode assembly to cause the safety hazard of short circuit and failure in the battery device; wherein the first groove segment is arranged close to the slot opening of the connecting groove, and the inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, which is capable of making the inner diameter of the slot opening of the connecting groove smaller than the inner diameter of the connecting groove, reducing the risk of the metal spatter falling off from the connecting groove; wherein the inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, which is capable of forming a convex surface at the connection between the first groove segment and the second groove segment, and the design of the convex surface is capable of further reducing the risk of the metal spatter entering the first groove segment from the second groove segment, thus further reducing the safety hazard of the metal spatter falling off from the connecting groove and falling into the inside of the electrode assembly, and further causing the short circuit and failure in the battery device; and the design of the convex surface is capable of increasing the space in the connecting groove, increasing the contact area between the glue body in the connecting groove and the groove wall, and further realizing the more sufficient bonding of the glue body and the metal spatter in the connecting groove; and the design of the convex surface is also capable of improving the connection stability of the glue body and the groove wall, reducing the risk of the glue body falling off from the connecting groove in the case of long-time immersion in electrolyte, reducing the risk of the glue body falling off from the connecting groove under the action of external force, and thus improving the reliability of the battery cell and the battery device.

[0027] The battery cell provided in the application comprises a shell, an electrode assembly, an adapter, and an end cover. The shell has a first accommodating space and an opening communicating with the first accommodating space. The electrode assembly is arranged in the first accommodating space. The adapter is arranged in the first accommodating space and connected with the tab of the electrode assembly. The end cover is connected with the shell and seals the opening, and the end cover is provided with an electrode terminal connected with the adapter. The adapter is provided with a first connecting surface and a second connecting surface arranged in a first direction and opposite to each other. The first connecting surface comprises a connecting groove, and the connecting groove is provided with a glue body. The first connecting surface is also connected with the tab. The second connecting surface comprises a first welding area configured to connect the electrode terminal. In the first direction, the connecting groove and the first welding area at least partially overlap. The connecting groove comprises a first groove segment and a second groove segment arranged in the first direction and communicating with each other. The first groove segment is arranged close to the groove opening of the connecting groove. The inner diameter of the first groove segment is smaller than that of the second groove segment, so as to form a convex surface at the connection between the first groove segment and the second groove segment. The adapter can electrically connect the tab of the battery cell with the electrode terminal of the battery cell. The first connecting surface and the second connecting surface are arranged in the first direction and opposite to each other, which can realize the separate welding of the adapter, the tab, and the electrode terminal. The glue body arranged in the connecting groove can collect, cover, and bond the welding metal spatter generated in the welding process, can fix the metal spatter in the connecting groove, and can prevent the metal spatter from falling into the interior of the electrode assembly to cause the safety hazard of internal short circuit and failure of the battery device. The first groove segment is arranged close to the groove opening of the connecting groove, and the inner diameter of the first groove segment is smaller than that of the second groove segment, which can make the inner diameter of the groove opening of the connecting groove smaller than that of the groove, and can reduce the risk of the metal spatter falling off from the connecting groove. The inner diameter of the first groove segment is smaller than that of the second groove segment, which can form a convex surface at the connection between the first groove segment and the second groove segment. The design of the convex surface can further reduce the risk of the metal spatter entering the first groove segment from the second groove segment, and thus can further reduce the safety hazard of the metal spatter falling off from the connecting groove and falling into the interior of the electrode assembly to cause the internal short circuit and failure of the battery device. The design of the convex surface can also increase the space in the connecting groove, increase the contact area between the glue body and the groove wall in the connecting groove, and thus can realize more sufficient bonding of the glue body and the metal spatter in the connecting groove. The design of the convex surface can also improve the connection stability of the glue body and the groove wall, reduce the risk of the glue body falling off from the connecting groove in the case of long-time immersion in electrolyte, reduce the risk of the glue body falling off from the connecting groove under the action of external force, and thus improve the reliability of the battery cell and the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings provided herein are for illustrative purposes only and are not considered a limitation on the application. Moreover, throughout the drawings, like reference numerals are used to designate like components. In the drawings:

[0029] Figure 1 Structure diagram of a vehicle according to one or more embodiments;

[0030] Figure 2 Exploded structure diagram of a battery device according to one or more embodiments;

[0031] Figure 3 Exploded structure diagram of a battery cell according to one or more embodiments;

[0032] Figure 4 Structure diagram of an adapter according to one or more embodiments;

[0033] Figure 5 Structure diagram of an adapter according to one or more embodiments;

[0034] Figure 6 Structure diagram of an adapter according to one or more embodiments; Figure 5 Cross-sectional structure diagram of an embodiment;

[0035] Figure 7 Structure diagram of a C region of an embodiment; Figure 6

[0036] Structure diagram of an adapter according to one or more embodiments; Figure 8

[0037] Structure diagram of an adapter according to one or more embodiments; Figure 9 Figure 8 Structure diagram of an adapter according to one or more embodiments;

[0038] Figure 10 Figure 8 Cross-sectional structure diagram of an embodiment;

[0039] Figure 11 Structure diagram of an adapter according to one or more embodiments;

[0040] Figure 12 Structure diagram of an adapter according to one or more embodiments; Figure 11 Cross-sectional structure diagram of an embodiment;

[0041] Figure 13 Structure diagram of an adapter according to one or more embodiments;

[0042] Figure 14 Cross-sectional structure diagram of an embodiment; Figure 13

[0043] Structure diagram of an adapter according to one or more embodiments; Figure 15 Figure 14 Structure diagram of an adapter according to one or more embodiments;

[0044] Figure 16 Figure 15 ​​​​An enlarged structural schematic view of the D region of the embodiment.

[0045] Reference signs in the detailed description of the embodiments are as follows:

[0046] Vehicle 1000a, battery device 100a, controller 200a, motor 300a, battery cell 1, case 10a, first portion 11a, second portion 12a, housing 100, end cover 120, shell 110, electrode assembly 500, adapter 501, first connecting surface 21, second connecting surface 22, connecting groove 40, first welding area 31, second welding area 32, first groove segment 41, second groove segment 42, boss surface 23, outer peripheral area 33, first dimension A, second dimension B, first cross-sectional width W, second cross-sectional width Y, first direction y, second direction x. Detailed Description of the Embodiments

[0047] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0048] Unless otherwise defined, 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims and the aforementioned description of the drawings, are intended to cover not exclusive inclusions.

[0049] Reference herein to "embodiments" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in the specification do not necessarily all refer to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood that the embodiments described herein can be combined.

[0050] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the positions or positional relationships indicated by the technical terms "length", "width", "thickness", "inner", "outer", "axial" and the like are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] With the development of battery device technology, battery devices are applied to more and more fields, and gradually replace traditional petrochemical energy in the field of automobile power and the like. The battery device can store chemical energy and controllably convert the chemical energy into electrical energy. In the recyclable battery device, after discharging, the active material can be activated by charging to continue to be used.

[0055] In the related art, the adapter sheet in the battery monomer will fall off the welding waste such as metal spatter generated in the process of welding with the tab and the electrode terminal. These metal spatters will fall into the electrode assembly, which is easy to cause short circuit and safety hazard of failure in the battery device.

[0056] Based on the above considerations, the application provides a battery monomer, an adapter, a battery device and an electric equipment. The battery monomer comprises a shell, an electrode assembly, an adapter, and an end cover. The shell has a first accommodating space and an opening communicating with the first accommodating space. The electrode assembly is arranged in the first accommodating space. The adapter is arranged in the first accommodating space and connected with the tab of the electrode assembly. The end cover is connected with the shell and seals the opening, and the end cover is provided with an electrode terminal connected with the adapter. The adapter is provided with a first connecting surface and a second connecting surface arranged in a first direction and opposite to each other. The first connecting surface comprises a connecting groove, and the connecting groove is provided with a glue body. The first connecting surface is further connected with the tab. The second connecting surface comprises a first welding area, and the first welding area is configured to connect the electrode terminal. In the first direction, the connecting groove and the first welding area at least partially overlap. The connecting groove comprises a first groove segment and a second groove segment arranged in the first direction and communicating with each other. The first groove segment is arranged close to the groove opening of the connecting groove. The inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, so as to form a boss surface at the connection between the first groove segment and the second groove segment. This arrangement can collect, cover and bond the welding metal spatter generated during the welding process, can fix the metal spatter in the connecting groove, prevent the metal spatter from falling into the interior of the electrode assembly to cause the safety hazard of short circuit and failure of the battery device, and the design of the boss surface can improve the connection stability of the glue body and the groove wall, reduce the risk of the glue body falling off from the connecting groove under the condition of long-time immersion in electrolyte, reduce the risk of the glue body falling off from the connecting groove under the action of external force, thereby improving the reliability of the battery monomer and the battery device.

[0057] The adapter, the battery monomer, the battery device and the electric equipment disclosed in the embodiments of the application can be used in an electric equipment using the battery device as a power supply or a variety of energy storage systems using the battery device as an energy storage element. The electric equipment can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0058] The following embodiments are described for convenience with a vehicle 1000a as an example of an electric equipment of an embodiment of the application.

[0059] Please refer to Figure 1The vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle. The vehicle 1000a is internally provided with a battery device 100a, which can be arranged at the bottom, head, or tail of the vehicle 1000a. The battery device 100a can be used for power supply of the vehicle 1000a, for example, the battery device 100a can be used as an operating power source of the vehicle 1000a. The vehicle 1000a can further include a controller 200a and a motor 300a, and the controller 200a is used to control the battery device 100a to supply power to the motor 300a, for example, to meet the power demand of the vehicle 1000a during starting, navigation, and driving.

[0060] In some embodiments of the present application, the battery device 100a can not only be used as an operating power source of the vehicle 1000a, but also be used as a driving power source of the vehicle 1000a, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000a.

[0061] In some embodiments, the battery device 100a can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] The battery device 100a mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity.

[0063] In the embodiments of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging to continue to use. The battery monomer can also be a primary battery.

[0064] The battery monomer includes but is not limited to a lithium ion battery monomer, a sodium ion battery monomer, a sodium lithium ion battery monomer, a lithium metal battery monomer, a sodium metal battery monomer, a lithium sulfur battery monomer, a magnesium ion battery monomer, a nickel hydrogen battery monomer, a nickel cadmium battery monomer, a lead storage battery monomer, etc.

[0065] In some embodiments, the battery device 100a can be a battery module, and when the battery monomer 1 is multiple, the multiple battery monomers 1 are arranged and fixed to form a battery module.

[0066] In some embodiments, please refer to Figure 2 The battery device 100a can be a battery pack, which includes a battery box 10a and a battery monomer 1, and the battery monomer 1 or the battery module is contained in the box 10a.

[0067] In some embodiments, the case 10a can be part of the chassis structure of the vehicle 1000a. For example, part of the case 10a can be at least part of the floor of the vehicle 1000a, or part of the case 10a can be at least part of the cross beams and longitudinal beams of the vehicle 1000a.

[0068] Please refer to Figure 2 , the battery device 100a includes a battery case 10a and a battery cell 1, the battery cell 1 is contained in the case 10a. Among them, the battery case 10a is used to provide a containing space for the battery cell 1, the case 10a can adopt various structures. In some embodiments, the battery case 10a can include a first part 11a and a second part 12a, the first part 11a and the second part 12a are covered with each other, and the first part 11a and the second part 12a together define a containing space for containing the battery cell 1. The second part 12a can be a hollow structure with one end open, and the first part 11a can be a plate structure, the first part 11a covers the open side of the second part 12a, so that the first part 11a and the second part 12a together define a containing space; the first part 11a and the second part 12a can also be hollow structures with one side open, and the open side of the first part 11a covers the open side of the second part 12a. Of course, the battery case 10a formed by the first part 11a and the second part 12a can have various shapes, such as a cylinder, a cuboid, etc.

[0069] In the battery device 100a, the battery cell 1 can be multiple, and the multiple battery cells 1 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that some of the multiple battery cells 1 are connected in series and some are connected in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 1 is contained in the battery case 10a; of course, the battery device 100a can also be that the multiple battery cells 1 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then contained in the battery case 10a. The battery device 100a can also include other structures, for example, the battery device 100a can also include a current combiner component for realizing the electrical connection between the multiple battery cells 1.

[0070] Please refer to Figure 3 , the battery cell 1 refers to the smallest unit that constitutes a battery. In this embodiment, a cylindrical battery cell 1 is taken as an example for description. As shown in Figure 3 , the battery cell 1 includes a housing 100, an electrode assembly 500, and other functional components.

[0071] In some embodiments, the housing 100 is used to encapsulate the electrode assembly 500 and other components such as electrolyte. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0072] The housing 100 can include an end cap 120 and a shell 110. The shell forms a first receiving space and an opening in communication with the first receiving space, and the end cap 120 refers to a component that covers the opening of the shell 110 to isolate the first receiving space from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the shell 110 to fit the shell 110. Alternatively, the end cap 120 can be made of a material with certain hardness and strength (e.g., aluminum alloy), so that the end cap 120 is less likely to deform when subjected to extrusion and impact, allowing the battery cell 1 to have higher structural strength and improved safety performance.

[0073] In some embodiments, the end cap 120 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value. The material of the end cap 120 can also be various, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component can also be provided on the inner side of the end cap 120, which can be used to isolate the electrical connection components in the shell 110 from the end cap 120 to reduce the risk of short circuit. Exemplarily, the insulating component can be plastic, rubber, etc.

[0074] The shell 110 is a component used to fit the end cap 120 to form the first receiving space of the battery cell 1, wherein the formed first receiving space can be used to accommodate the electrode assembly 500, electrolyte, and other components. The shell 110 and the end cap 120 can be independent components. For example, the shell 110 is provided with an opening, and the end cap 120 can cover the opening of the shell 110 to form the first receiving space of the battery cell 1. In addition, the end cap 120 and the shell 110 can also be integrated. For example, the end cap 120 and the shell 110 can form a common connecting surface before other components enter the shell, and then the end cap 120 covers the shell 110 when it is necessary to encapsulate the inside of the shell 110. The shell 110 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 110 can be determined according to the specific shape and size of the electrode assembly 500. The material of the shell 110 can be various, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0075] The electrode assembly 500 is a component in which electrochemical reactions occur in the battery cell 1. The shell 110 can contain one or more electrode assemblies 500.

[0076] In some embodiments, the electrode assembly 500 includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive electrode and the negative electrode from shorting while allowing the active ions to pass through.

[0077] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0078] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0079] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (e.g., a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (may also be referred to as LFP), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (may also be referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (may also be referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (may also be referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (may also be referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (may also be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2), and modified compounds thereof.

[0081] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0082] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, a carbon, nickel, or titanium, or the like can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, or the like. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0083] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0084] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0085] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0086] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0087] In some embodiments, the electrode assembly 500 further includes a separator disposed between the positive electrode and the negative electrode.

[0088] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0089] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0090] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0091] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The present application does not have a particular limitation on the type of the electrolyte, and the electrolyte can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0092] The liquid electrolyte includes an electrolyte salt and a solvent.

[0093] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonimide, lithium bis-trifluoromethanesulfonimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium bisoxalate borate, lithium difluorobisoxalate phosphate, and lithium tetrafluorobisoxalate phosphate.

[0094] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0095] In some embodiments, the gel-state electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0096] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0097] As an example, the polymer solid-state electrolyte can be one or more of a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, etc.

[0098] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfur, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0099] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0100] In some embodiments, the electrode assembly 500 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0101] In some embodiments, the battery cell 1 further comprises a connector 501, the tab of the electrode assembly 500 can be connected to the connector 501 to export current from the electrode assembly 500. The tab includes a positive tab and a negative tab. The positive and negative tabs can be located at one end of the main body or at two ends of the main body respectively. During the charging and discharging process of the battery device 100a, the positive and negative active materials react with the electrolyte.

[0102] In some embodiments, as shown in Figures 1 to 16 , the battery cell 1 includes a shell 110, an electrode assembly 500, a connector 501, and an end cover 120, the shell 110 has a first accommodating space and an opening communicating with the first accommodating space; the electrode assembly 200 is arranged in the first accommodating space; the connector 501 is arranged in the first accommodating space and connected to the tab of the electrode assembly 500; the end cover 120 is connected to the shell 110 and closes the opening, and the end cover 120 is provided with an electrode terminal connected to the connector 501; wherein, referring to Figure 6 , the connector 501 is provided with a first connecting surface 21 and a second connecting surface 22 arranged in a first direction y and oppositely arranged, the first connecting surface 21 includes a connecting groove 40, the connecting groove 40 is provided with a glue, and the first connecting surface 21 is further connected to the tab, referring to Figure 6 , the second connecting surface 22 includes a first welding area 32, the first welding area 32 is configured to connect the electrode terminal; wherein, along the first direction y, the connecting groove 40 and the first welding area 32 at least partially overlap; the connecting groove 40 includes a first groove section 41 and a second groove section 42 arranged in the first direction y and communicating with each other, the first groove section 41 is arranged close to the slot of the connecting groove 40; the inner diameter of the first groove section 41 is smaller than the inner diameter of the second groove section 42, so as to form a convex surface 23 at the connection between the first groove section 41 and the second groove section 42.

[0103] During the manufacturing process of the battery cell 1, welding waste such as welding slag and flying chips generated by welding may affect the normal operation of the battery cell 1. The setting of the glue dispensing can fix the welding slag by using the adhesion and bonding of the glue, avoid damage to the internal components of the battery cell 1, and improve the safety performance of the battery cell 1.

[0104] Specifically, the glue used for glue dispensing can be acrylic glue, polyimide substrate, etc. Such glue has good high temperature resistance, needle puncture strength, tensile strength, electrolyte corrosion resistance and electrical insulation performance, which is crucial to ensure the safety performance of the battery cell 1.

[0105] By setting the connecting groove 40 as the glue hole on the adapter 501, the glue can be more firmly fixed on the adapter 501, increasing the glue area of the glue and the adapter 501, and increasing the restriction of the adapter 501 on the glue, making the glue more firmly glued with welding slag, flying chips and other welding waste, avoiding the influence of the falling glue on the normal work of the battery monomer 1.

[0106] The adapter 501 is used to electrically connect the tab of the battery monomer 1 and the electrode terminal of the battery monomer 1. In some embodiments, the electrode terminal is arranged on the end cover of the battery monomer 1.

[0107] The inner diameter of the first groove section 41 is smaller than the inner diameter of the second groove section 42, that is, the inner diameter of the first groove section 41 is not equal to the inner diameter of the second groove section 42, so that the boss surface 23 can be formed at the connection between the first groove section 41 and the second groove section 42. The boss surface 23 is a transition surface, so it can effectively collect the metal flying chips generated during welding. The metal flying chips can be collected at the groove bottom of the second groove section 42. The design of the boss surface 23 can reduce the risk of metal flying chips entering the first groove section 41 from the second groove section 42 and then falling out of the connecting groove 40. This structure design can cooperate with the glue in the connecting groove 40 to fully cover and adhere the metal flying chips generated during welding in the connecting groove 40, reducing the risk of metal flying chips falling into the inside of the electrode assembly 500, causing internal short circuit and failure of the battery device 100a.

[0108] In the above manner, the adapter 501 can electrically connect the tab of the battery monomer 1 and the electrode terminal of the battery monomer 1; the first connecting surface 21 and the second connecting surface 22 are arranged along the first direction y and are oppositely arranged, which can realize the separate welding of the adapter 501 and the tab and the electrode terminal; the connecting groove 40 is provided with a glue body, which can realize the collection, covering and bonding of the welding metal spatter generated during the welding process, can fix the metal spatter in the connecting groove 40, prevent the metal spatter from falling into the inside of the electrode assembly 500 to cause the safety hazard of short circuit and failure of the battery device 100a; wherein the first groove section 41 is arranged close to the slot opening of the connecting groove 40, and the inner diameter of the first groove section 41 is smaller than the inner diameter of the second groove section 42, which can make the inner diameter of the slot opening of the connecting groove 40 smaller than the inner diameter of the groove of the connecting groove 40, reduce the risk of metal spatter falling off from the connecting groove 40; wherein the inner diameter of the first groove section 41 is smaller than the inner diameter of the second groove section 42, which can form a boss surface 23 at the connection between the first groove section 41 and the second groove section 42, the design of the boss surface 23 can further reduce the risk of metal spatter entering the first groove section 41 from the second groove section 42, so as to further reduce the risk of metal spatter falling off from the connecting groove 40 and falling into the inside of the electrode assembly 500, thereby causing the safety hazard of short circuit and failure of the battery device 100a; and the design of the boss surface 23 can increase the space in the connecting groove 40, increase the contact area of the glue body in the connecting groove 40 and the groove wall of the connecting groove 40, thereby realizing more sufficient bonding of the glue body and the metal spatter in the connecting groove 40; and the design of the boss surface 23 can also improve the connection stability of the glue body and the groove wall, reduce the risk of the glue body falling off from the connecting groove 40 under the condition of long-time immersion in electrolyte, reduce the risk of the glue body falling off from the connecting groove 40 under the action of external force, thereby improving the reliability of the battery monomer 1 and the battery device 100a.

[0109] In some application scenarios, the battery monomer 1 comprises a shell and an electrode assembly, and the adapter 501. In the prior art, the glue in the connecting groove 40 of the adapter 501 is prone to have a problem of excessive height in the first direction y after curing, which can cause extrusion to the electrode assembly when the electrode assembly and the shell are assembled, and the electrode assembly is prone to be pressed. The first groove section 41 of the connecting groove 40 is arranged close to the groove opening of the connecting groove 40, and the inner diameter of the first groove section 41 is smaller than the inner diameter of the second groove section 42, so that the connecting groove 40 is in a shape similar to a gourd, the glue injection is facilitated, the risk of excessive height of the glue in the first direction y after curing is reduced, and thus the extrusion to the electrode assembly when the electrode assembly and the shell are assembled is reduced. Moreover, the glue in a molten state after high-temperature treatment is prone to have a problem that the morphology and height of the glue are difficult to be controlled in the curing process. The connecting groove 40 in a shape similar to a gourd can make the glue in the connecting groove 40 in a shape similar to a gourd, so that the risk of adhesion and wire drawing of the glue to other components in the curing process is reduced. Moreover, the wire drawing of the glue can cause a problem of welding explosion points in the welding process of the end cover of the battery monomer 1. The connecting groove 40 in a shape similar to a gourd can reduce the wire drawing of the glue, so that the problem of welding explosion points is reduced, and the welding effect is improved.

[0110] In some embodiments, referring to Figure 6 , the boss surface 23 is perpendicular to the first direction y.

[0111] The welding particles, metal scraps and other welding waste falling into the connecting groove 40 during welding can fall out of the connecting groove 40 along the first direction y. The boss surface 23 perpendicular to the first direction y can better prevent the metal scraps and other welding waste from falling out of the connecting groove 40. Moreover, this structure can block the glue in the connecting groove 40, prevent the glue from falling out, reduce the risk of falling out of the connecting groove 40 of the glue in the case of long-term immersion in electrolyte, and has a long-term effective fixing effect.

[0112] In some embodiments, the boss surface 23 can also be arranged at an acute angle with the first direction y, i.e., the boss surface 23 is arranged obliquely, which can expand the space in the connecting groove 40, increase the contact area between the connecting groove 40 and the glue, and improve the adhesion.

[0113] In some embodiments, the boss surface 23 can also be arranged as a curved surface structure to increase the friction between the glue and the groove wall of the connecting groove 40.

[0114] In some embodiments, referring to Figure 6 , Figure 7 , the inner side wall of the first groove section 41 is arranged parallel to the first direction y.

[0115] This structure is simpler, reduces costs, and facilitates production and assembly. In one application scenario, the inner wall of the first groove segment 41 is set perpendicular to the boss surface 23, which can improve the blocking effect of the boss surface 23 on the flying debris falling into the connecting groove 40 during welding, and reduce the risk of flying debris falling out of the connecting groove 40.

[0116] In some embodiments, the inner wall of the second groove segment 42 is arranged parallel to the first direction y.

[0117] This structure is simpler, reduces costs, and facilitates production and assembly.

[0118] In some embodiments, the inner wall of the first groove segment 41 and the inner wall of the second groove segment 42 are both arranged parallel to the first direction y.

[0119] This design facilitates slotting and injection of adhesive into the connecting groove 40, reducing the likelihood of air bubbles forming between the groove wall and the adhesive, thus improving the adhesion of the adhesive to metal shavings. Especially when the boss surface 23 is perpendicular to the first direction y, it further enhances the blocking effect on the adhesive, preventing it from detaching.

[0120] In some embodiments, the inner wall of the first groove segment 41 may be inclined so that the inner diameter of the first groove segment 41 gradually decreases toward the opening of the connecting groove 40, thereby further reducing the opening of the connecting groove 40.

[0121] In some embodiments, the inner wall of the second groove segment 42 may be inclined so that the inner diameter of the second groove segment 42 gradually decreases toward the opening of the connecting groove 40, thereby further improving the blocking effect on the colloid and reducing the risk of the colloid coming off.

[0122] In some embodiments, the boss surface 23 is an annular boss surface.

[0123] This setup can block welding waste such as metal shavings in the second groove section 42 from all 360 degrees, and can also block the colloid in the connecting groove 40 from all 360 degrees, preventing the colloid from falling off and reducing the risk of metal shavings falling out of the connecting groove 40.

[0124] In some embodiments, the boss surface 23 may also be an arc-shaped boss surface, such as a semi-circular arc, to simplify the manufacturing process.

[0125] In some embodiments, see Figure 6 , Figure 7 The annular boss surface, the first groove segment 41, and the second groove segment 42 are coaxially arranged.

[0126] This structure is simple and easy to groove. The coaxial arrangement allows the annular boss surface to be a ring with a uniform width, achieving 360-degree uniform support for the colloid in the groove and preventing the colloid from falling off.

[0127] In some embodiments, different shafts can also be provided. For example, the width of the annular convex surface around the annular convex surface can not be the same.

[0128] In some embodiments, the projection of the annular convex surface in the first direction y can be a circular ring, a square ring, a curved ring, an inner circular outer square ring, an inner square outer circular ring, etc.

[0129] In some embodiments, referring to Figure 7 , Figure 16 The first size A of the first slot section 41 in the first direction y is less than or equal to the second size B of the second slot section 42 in the first direction y.

[0130] When the first size A is less than the second size B, it is more convenient to glue into the second slot section 42, so that the glue covers the entire second slot section 42; the second size B of the second slot section 42 is larger, which can store and collect more metal scraps and other welding waste, and the second slot section 42 is deeper, which can accommodate more glue, thereby being able to bond more welding metal scraps, and also being able to reduce the risk of metal scraps and other welding waste falling out of the connecting groove 40. When the first size A is equal to the second size B, the depths of the first slot section 41 and the second slot section 42 are the same, which is convenient for processing.

[0131] In some embodiments, the first ratio of the first size A to the second size B is 20%-100%.

[0132] For example, the first ratio can be 20%, 30%, 40%, 45%, 50%, 60%, 65%, 68%, 70%, 80%, 85%, 90% or 100%, etc. Such a setting can further reduce the risk of metal scraps and other welding waste falling out of the connecting groove 40.

[0133] In some embodiments, the first ratio is 30%-70%.

[0134] For example, the first ratio can be 30%, 35%, 36%, 38%, 40%, 45%, 50%, 55%, 60% or 70%, etc. Such a setting can further reduce the risk of metal scraps and other welding waste falling out of the connecting groove 40.

[0135] Referring to Table 1, when the first cross-sectional width W of the first slot section 41 is 50% of the second cross-sectional width Y in the second slot section 42, the number of metal residual particles on the adapter 501 and the cycle capacity retention rate corresponding to different test examples with different first ratios are shown in Table 1. The number of metal residual particles represents the number of welding scraps and other welding waste generated by welding. The cycle capacity retention rate refers to the percentage of the remaining capacity to the initial capacity of the battery monomer 1 after a certain number of charge and discharge cycles. This index can be used to measure the capacity attenuation of the battery monomer 1 during the cycle process, and is one of the important parameters for evaluating the performance and life of the battery monomer 1. Specifically, if the cycle capacity retention rate of a battery monomer 1 is 90%, it means that after a certain number of charge and discharge cycles, the capacity of the battery monomer 1 is only reduced by 10%. The higher the cycle capacity retention rate, the longer the life of the battery monomer 1, and the slower the performance degradation of the battery monomer 1.

[0136] Table 1 - Number of metal residual particles on adapter and cycle capacity retention rate corresponding to different first ratios

[0137]

[0138]

[0139] For example, in test example 4, when the first ratio is 50%, the first size A of the first slot section 41 along the first direction y is equal to 50% of the second size B of the second slot section 42 along the first direction y, and the number of metal residual particles is 32 / ea, that is, the number of metal residual particles on each battery monomer 1 is not more than 32; and the cycle capacity retention rate of the battery monomer 1 after a certain number of charge and discharge cycles is 88%.

[0140] In some embodiments, the first ratio is 50%, which can be more conducive to the metal scraps falling off during colloidal adhesive welding, effectively avoiding the risk of short circuit inside the battery monomer 1, and improving the service life of the battery monomer 1.

[0141] In some embodiments, referring to Figure 7 , Figure 16 , the second ratio of the first cross-sectional width W of the first slot section 41 along the second direction x to the second cross-sectional width Y of the second slot section 42 along the second direction x is 30%-80%, and the second direction x is perpendicular to the first direction y.

[0142] For example, the second ratio can be 30%, 35%, 38%, 40%, 42%, 45%, 46%, 50%, 55%, 58%, 60%, 63%, 65%, 66%, 70%, 71%, 75%, or 80%, etc. Such a setting is conducive to the metal spatter dropped during the adhesive welding, effectively avoiding the risk of internal short circuit of the battery monomer 1. The smaller the second ratio is, the greater the difference between the cross-sectional widths of the first groove segment 41 and the second groove segment 42 is, and the greater the width of the boss surface 23 along the second direction x is, the better the effect of preventing the metal spatter from falling off and preventing the gel from falling off.

[0143] In some embodiments, the second ratio is 40%-50%. For example, 40%, 43%, 45%, 46%, 48%, or 50%, etc., can be more conducive to the metal spatter dropped during the adhesive welding, effectively avoiding the risk of internal short circuit of the battery monomer 1.

[0144] Referring to Table 2, Table 2 is the number of metal residual particles on the adapter 501 and the cycle capacity retention rate corresponding to different test examples with different second ratios. Among them, the number of metal residual particles represents the residual number of welding spatter and other welding waste generated during welding; among them, the cycle capacity retention rate refers to the ratio of the remaining capacity to the initial capacity of the battery monomer 1 after a certain number of charge and discharge cycles. This indicator can be used to measure the degree of capacity attenuation of the battery monomer 1 during the cycle use, and is one of the important parameters for evaluating the performance and life of the battery monomer 1. Specifically, if the cycle capacity retention rate of a battery monomer 1 is 90%, it means that after a certain number of charge and discharge cycles, the capacity of the battery monomer 1 has only decreased by 10%. The higher the cycle capacity retention rate is, the longer the life of the battery monomer 1 is, and the slower the performance degradation of the battery monomer 1 is. Among them, Comparative Example 1 is a comparative example containing only the second groove segment 42, and Comparative Example 2 is a comparative example containing only the first groove segment 41. The groove depth of Comparative Example 1 is different from that of Comparative Example 2.

[0145] Table 2-Number of metal residual particles on the adapter corresponding to different first cross-sectional widths W and second cross-sectional widths Y and cycle capacity retention rate

[0146] Wherein, d is a preset reference value, W / d represents the ratio of the first cross-sectional width W to d, and Y / d represents the ratio of the second cross-sectional width Y to d. Specifically, in Test Example 10 to Test Example 15 and Comparative Example 1, the value of Y is equal to d, and at this time, in Test Example 10 to Test Example 15 or Comparative Example 1, W / d is equal to W / Y, that is, the value of W / d is the second ratio, wherein in Comparative Example 1, W is 0, W / d is equal to 0, and the second ratio is 0, and Comparative Example 1 is a comparative example including only the second groove segment 42; in Comparative Example 2, the value of W is equal to d, and the value of Y is 0, that is, in Comparative Example 2, the connecting groove 40 only includes the first groove segment 41.

[0147] For example, in Test Example 12, when the second ratio is 50%, the first cross-sectional width W of the first groove segment 41 along the second direction x is equal to 50% of the second cross-sectional width Y of the second groove segment 42 along the second direction x, and at this time, the number of metal residual particles is 32 / ea, that is, the number of metal residual particles on each battery monomer 1 is not more than 32; and the cycle capacity retention rate of the battery monomer 1 after a certain number of charge and discharge cycles is 82%.

[0148] In some embodiments, referring to Figure 8 、 Figure 9 、 Figure 10 , the first connecting surface 21 and the second connecting surface 22 are two parallel planes.

[0149] The two parallel planes can reduce the occupied space of the adapter 501, reduce the size of the battery monomer 1, and have a simple structure.

[0150] In some embodiments, referring to Figure 6 、 Figures 11 to 15 , the second connecting surface 22 further includes an outer peripheral area 33 of the first welding area 32, and the first welding area 32 and the outer peripheral area 33 are arranged in a staggered manner along the first direction y.

[0151] Such an arrangement can facilitate the welding of the electrode terminal. For example, referring to Figure 6 、 Figure 11 , the projection of the first welding area 32 along the first direction y is located within the projection of the connecting groove 40 along the first direction y, and the first welding area 32 is arranged in a protruding manner relative to the outer peripheral area 33 along the first direction y away from the first connecting surface 21, facilitating the welding of the first welding area 32 and the electrode terminal; for another example, referring to Figure 13 、 Figure 14In some embodiments, referring to Figs. 1 and 2, the first welding area 32 is concavely arranged in the first direction y relative to the outer peripheral area 33 towards the first connecting surface 21, which can provide a space for the electrode terminal to facilitate welding. In other embodiments, the shape of the adapter 501 can be further improved according to the shape of the tab, the electrode terminal, and the overall size of the battery monomer 1, which is not limited in particular.

[0152] In some embodiments, referring to Figs. 1 and 2, Figure 11 , Figure 12 , the first connecting surface 21 is arranged as a plane, and the first welding area 32 is convexly arranged in the first direction y relative to the outer peripheral area 33 away from the first connecting surface 21, and the projection of the first welding area 32 towards the first connecting surface 21 covers the connecting groove 40.

[0153] The first connecting surface 21 is a plane, and the second connecting surface 22 includes the convex first welding area 32 to facilitate welding with the electrode terminal; the projection of the first welding area 32 towards the first connecting surface 21 covers the connecting groove 40, which can improve the collection of welding waste such as welding spatter during welding by the connecting groove 40, and reduce the risk of welding spatter falling out of the connecting groove 40 and entering the inside of the battery monomer 1.

[0154] In some embodiments, referring to Figs. 1 and 2, Figure 13 , Figure 14 , the first connecting surface 21 further includes the second welding area 31, and the second welding area 31 is welded with the tab; in the first direction y, the area where the connecting groove 40 is located is arranged in a staggered manner with the second welding area 31, and the first welding area 32 is arranged in a staggered manner with the outer peripheral area 33.

[0155] The second welding area 31 of the adapter 501 is welded with the tab to achieve electrical connection, and the first welding area 32 of the adapter 501 is welded with the electrode terminal to achieve electrical connection, and the second welding area 31 and the first welding area 32 are arranged on the first connecting surface 21 and the second connecting surface 22, respectively, which are arranged in opposite directions, to facilitate electrical connection between the electrode terminal and the tab.

[0156] In the first direction y, the area where the connecting groove 40 is located is arranged in a staggered manner with the second welding area 31, and the first welding area 32 is arranged in a staggered manner with the outer peripheral area 33, which can provide separate welding planes for the second welding area 31 and the first welding area 32 to improve welding firmness. For example, in an application scenario, a stepped adapter 501 can be provided. In an application scenario, the second welding area 31 and the first welding area 32 can be arranged in a non-overlapping manner in the first direction y.

[0157] In some embodiments, the second welding area 31 and the first welding area 32 can be arranged in a non-overlapping manner in the first direction y, which can reduce mutual interference between the second welding area 31 and the first welding area 32.

[0158] In some embodiments, referring to Figure 13 , the second welding area 31 and the first welding area 32 are located in the same plane perpendicular to the first direction y.

[0159] After the second welding area 31 and the tab are welded, and the first welding area 32 and the electrode terminal are welded, this arrangement can reduce the space occupied by the adapter 501, thereby improving the structural compactness of the battery monomer 1.

[0160] In some embodiments, the shape of the adapter 501 can be improved according to the overall structure of the tab, the electrode terminal, and the battery monomer 1. For example, referring to Figure 5 , the adapter 501 is a U-shaped sheet structure; referring to Figure 8 , the adapter 501 is a flat sheet structure; referring to Figure 13 , the adapter 501 is a stepped sheet structure, and the like.

[0161] In some embodiments, the shape of the first groove section 41 and the second groove section 42 can also be improved according to the needs of use. For example, the first groove section 41 can be set as a circular groove section, the second groove section 42 can be set as a square groove section, or both the first groove section 41 and the second groove section 42 can be set as circular groove sections, or both the first groove section 41 and the second groove section 42 can be set as square groove sections. The specific shape is not limited, for example, the first groove section 41 or the second groove section 42 can be set as a rectangular groove section, a rhombic groove section, an irregular groove section, and the like.

[0162] In some embodiments, the connecting groove 40 can also be set as a plurality of groove sections arranged along the first direction y and connected, and the boss surface 23 is arranged between the groove sections, so as to further reduce the risk of the gel falling off from the connecting groove 40 under the condition of long-term immersion in electrolyte or under the influence of external force, and reduce the risk of metal debris falling into the inside of the electrode assembly 500, thereby causing internal short circuit and failure of the battery device 100a.

[0163] For example, the connecting groove 40 includes the first groove section 41, the second groove section 42, and the third groove section arranged along the first direction y in sequence and connected, the first groove section 41 is close to the opening of the connecting groove 40, the third groove section is close to the groove bottom of the connecting groove 40, the inner diameters of the first groove section 41, the second groove section 42, and the third groove section are different and increase in sequence, the connection between the first groove section 41 and the second groove section 42 forms the boss surface 23, and the connection between the second groove section 42 and the third groove section forms the boss surface 23. The boss surface 23 and the third groove section can be improved similarly according to the above embodiments.

[0164] In some embodiments, the adapter 501 is an integrally formed structure.

[0165] In some embodiments, referring to Figure 4 , Figure 5 , Figure 6 , the adapter 501 is a U-shaped adapter sheet, the adapter 501 is provided with a first connecting surface 21 and a second connecting surface 22 arranged along a first direction y and oppositely arranged, the first connecting surface 21 comprises a connecting groove 40 and a second welding area 31, the connecting groove 40 is configured to accommodate a gel, and the second welding area 31 is configured to connect a tab of the battery monomer 1, the second connecting surface 22 comprises a first welding area 32, and the first welding area 32 is configured to connect an electrode terminal of the battery monomer 1; wherein a projection of the connecting groove 40 along the first direction y to the second connecting surface 22 is located in the first welding area 32; the connecting groove 40 comprises a first groove section 41 and a second groove section 42 arranged along the first direction y and communicated, and the first groove section 41 is arranged close to a groove opening of the connecting groove 40; an inner diameter of the first groove section 41 is smaller than an inner diameter of the second groove section 42, so as to form a boss surface 23 at a connection of the first groove section 41 and the second groove section 42, specifically, a first cross-sectional width W of the first groove section 41 along a second direction x is smaller than a second cross-sectional width Y of the second groove section 42 along the second direction x by a second ratio; the boss surface 23 is an annular boss surface, and the boss surface 23 is perpendicular to the first direction y, and an inner side wall of the first groove section 41 and an inner side wall of the second groove section 42 are both arranged parallel to the first direction y; further, a first size A of the first groove section 41 along the first direction y is smaller than or equal to a second size B of the second groove section 42 along the first direction y; wherein the first direction y is perpendicular to the second direction x. Wherein the second connecting surface 22 further comprises an outer peripheral area 33 of the first welding area 32, the first welding area 32 and the outer peripheral area 33 are arranged in a staggered manner along the first direction y; the first connecting surface 21 is arranged in a plane, the first welding area 32 is arranged protruding away from the first connecting surface 21 relative to the outer peripheral area 33 along the first direction y, and a projection of the first welding area 32 to the first connecting surface 21 covers the connecting groove 40. In this way, the risk of metal spatter falling into the electrode assembly 500 can be effectively reduced, thereby improving the reliability of the battery monomer 1 and the battery device 100a.

[0166] In some embodiments, the adapter 501 is used for the battery monomer 1, referring to Figure 6 , the adapter 501 is provided with a first connecting surface 21 and a second connecting surface 22 arranged along a first direction y and oppositely arranged, referring to Figure 4 , Figure 5 , the first connecting surface 21 comprises a connecting groove 40, and the first connecting surface 21 further connects a tab of the battery monomer 1, referring to Figure 6The second connecting surface 22 comprises a first welding area 32 configured to connect the electrode terminal of the battery monomer 1; wherein, along the first direction y, the connecting groove 40 at least partially overlaps the first welding area 32; the connecting groove 40 comprises a first groove section 41 and a second groove section 42 arranged and communicated along the first direction y, and the first groove section 41 is arranged close to the groove opening of the connecting groove 40; the inner diameter of the first groove section 41 is smaller than the inner diameter of the second groove section 42, so as to form the boss surface 23 at the connection between the first groove section 41 and the second groove section 42.

[0167] This arrangement can realize the collection, covering and bonding of the welding metal spatter generated in the welding process, can fix the metal spatter in the connecting groove 40, prevent the metal spatter from falling into the inside of the electrode assembly 500 to cause the safety hazard of short circuit and failure of the battery device 100a; and the design of the boss surface 23 can also improve the connection stability of the glue and the groove wall, reduce the risk of the glue falling off from the connecting groove 40 under the condition of long-time immersion in electrolyte, and reduce the risk of the glue falling off from the connecting groove 40 under the action of external force.

[0168] In some embodiments, the boss surface 23 is perpendicular to the first direction y; the inner side wall of the first groove section 41 and / or the inner side wall of the second groove section 42 are arranged parallel to the first direction y.

[0169] In an application scenario, the inner side wall of the first groove section 41 and the inner side wall of the second groove section 42 are arranged parallel to the first direction y; in another application scenario, the boss surface 23 is perpendicular to the first direction y; the inner side wall of the first groove section 41 is arranged parallel to the first direction y, or the inner side wall of the second groove section 42 is arranged parallel to the first direction y. For specific embodiments, reference can be made to the above embodiments, which will not be repeated here.

[0170] In some embodiments, the boss surface 23 is an annular boss surface; the annular boss surface, the first groove section 41 and the second groove section 42 are coaxially arranged. For specific embodiments, reference can be made to the above embodiments, which will not be repeated here.

[0171] In some embodiments, the first dimension A of the first groove section 41 along the first direction y is less than or equal to the second dimension B of the second groove section 42 along the first direction y. For specific embodiments, reference can be made to the above embodiments, which will not be repeated here.

[0172] In some embodiments, the second ratio of the first cross-sectional width W of the first groove section 41 along the second direction x to the second cross-sectional width Y of the second groove section 42 along the second direction x is 30%-80%, and the second direction x is perpendicular to the first direction y. For specific embodiments, reference can be made to the above embodiments, which will not be repeated here.

[0173] In some embodiments, the battery device 100a comprises the battery cell 1 of any of the above embodiments. The battery cell 1 comprises a housing 110 having a first accommodating space and an opening communicating with the first accommodating space, an electrode assembly 200 arranged in the first accommodating space, a connector 501 arranged in the first accommodating space and connected with the tab of the electrode assembly 500, and an end cover 120 connected with the housing 110 and closing the opening, and the end cover 120 is provided with an electrode terminal connected with the connector 501. Referring to Figure 6 , the connector 501 is provided with a first connecting surface 21 and a second connecting surface 22 arranged in the first direction y and oppositely arranged, the first connecting surface 21 comprises a connecting groove 40, the connecting groove 40 is provided with a glue body, and the first connecting surface 21 is further connected with the tab. Referring to Figure 6 , the second connecting surface 22 comprises a first welding area 32 configured to connect the electrode terminal; wherein, along the first direction y, the connecting groove 40 and the first welding area 32 at least partially overlap; the connecting groove 40 comprises a first groove segment 41 and a second groove segment 42 arranged in the first direction y and communicating, the first groove segment 41 is arranged close to the slot opening of the connecting groove 40; the inner diameter of the first groove segment 41 is smaller than the inner diameter of the second groove segment 42, so as to form a boss surface 23 at the connection between the first groove segment 41 and the second groove segment 42. This arrangement can realize the collection, covering and adhesion of the welding metal spatter generated during the welding process, can fix the metal spatter in the connecting groove 40, prevent the metal spatter from falling into the inside of the electrode assembly 500 to cause the safety hazard of short circuit and failure of the battery device 100a; and the design of the boss surface 23 can also improve the connection stability of the glue body and the groove wall, reduce the risk of the glue body falling off from the connecting groove 40 under the condition of long-time immersion in electrolyte, and reduce the risk of the glue body falling off from the connecting groove 40 under the action of external force.

[0174] According to some embodiments of the present application, as shown in Figure 1 , the power consuming device comprises the battery device 100a described above. In this way, the battery cell 1 comprises a housing 110 having a first accommodating space and an opening communicating with the first accommodating space, an electrode assembly 200 arranged in the first accommodating space, a connector 501 arranged in the first accommodating space and connected with the tab of the electrode assembly 500, and an end cover 120 connected with the housing 110 and closing the opening, and the end cover 120 is provided with an electrode terminal connected with the connector 501. Referring to Figure 6 , the connector 501 is provided with a first connecting surface 21 and a second connecting surface 22 arranged in the first direction y and oppositely arranged, the first connecting surface 21 comprises a connecting groove 40, the connecting groove 40 is provided with a glue body, and the first connecting surface 21 is further connected with the tab. Referring to Figure 6The second connecting surface 22 comprises a first welding area 32 configured to connect the electrode terminal; wherein the connecting groove 40 at least partially overlaps the first welding area 32 along the first direction y; the connecting groove 40 comprises a first groove segment 41 and a second groove segment 42 arranged and communicated along the first direction y, the first groove segment 41 is arranged close to the groove opening of the connecting groove 40; the inner diameter of the first groove segment 41 is smaller than that of the second groove segment 42, so as to form a boss surface 23 at the connection between the first groove segment 41 and the second groove segment 42. This arrangement can realize the collection, covering and bonding of the welding metal spatter generated during the welding process, can fix the metal spatter in the connecting groove 40, prevent the metal spatter from falling into the inside of the electrode assembly 500 to cause the safety hazard of short circuit and failure of the battery device 100a; and the design of the boss surface 23 can also improve the connection stability of the glue and the groove wall, reduce the risk of the glue falling off from the connecting groove 40 under the condition of long-time immersion in electrolyte, and reduce the risk of the glue falling off from the connecting groove 40 under the action of external force.

[0175] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: The housing has a first receiving space and an opening communicating with the first receiving space; An electrode assembly is disposed within the first accommodating space; An adapter is disposed within the first accommodating space and is connected to the tabs of the electrode assembly; An end cap is connected to the housing and closes the opening, and the end cap is provided with electrode terminals that are connected to the adapter. The adapter includes a first connecting surface and a second connecting surface arranged in opposite directions along a first direction. The first connecting surface includes a connecting groove containing an adhesive. The first connecting surface is also connected to the electrode tab. The second connecting surface includes a first welding area configured to connect to the electrode terminal. Along the first direction, the connecting groove and the first welding area at least partially overlap. The connecting groove includes a first groove segment and a second groove segment arranged in the first direction and communicating with each other. The first groove segment is located near the opening of the connecting groove. The inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, so as to form a boss surface at the connection between the first groove segment and the second groove segment.

2. The battery cell according to claim 1, characterized in that, The boss surface is perpendicular to the first direction.

3. The battery cell according to claim 1 or 2, characterized in that, The inner wall of the first groove segment and / or the inner wall of the second groove segment are arranged parallel to the first direction.

4. The battery cell according to claim 1, characterized in that, The boss surface is an annular boss surface.

5. The battery cell according to claim 4, characterized in that, The annular boss surface, the first groove segment, and the second groove segment are coaxially arranged.

6. The battery cell according to claim 1, characterized in that, The first dimension of the first groove segment along the first direction is less than or equal to the second dimension of the second groove segment along the first direction.

7. The battery cell according to claim 6, characterized in that, The first ratio of the first dimension to the second dimension is 20%-100%.

8. The battery cell according to claim 7, characterized in that, The first ratio is 30%-70%.

9. The battery cell according to claim 1, characterized in that, The second ratio of the width of the first cross section of the first groove segment along the second direction to the width of the second cross section of the second groove segment along the second direction is 30%-80%, and the second direction is perpendicular to the first direction.

10. The battery cell according to claim 9, characterized in that, The second ratio is 40%-50%.

11. The battery cell according to claim 1, characterized in that, The first connecting surface and the second connecting surface are two planes that are parallel to each other.

12. The battery cell according to claim 1, characterized in that, The second connecting surface also includes the outer peripheral region of the first welding area, and the first welding area and the outer peripheral region are offset along the first direction.

13. The battery cell according to claim 12, characterized in that, The first connecting surface is planar, and along the first direction, the first welding area protrudes away from the first connecting surface relative to the outer peripheral area, and the projection of the first welding area toward the first connecting surface covers the connecting groove.

14. The battery cell according to claim 12, characterized in that, The first connecting surface further includes a second welding area, which is welded to the electrode tab; along the first direction, the area where the connecting groove is located is offset from the second welding area, and the first welding area is offset from the outer peripheral area.

15. The battery cell according to claim 14, characterized in that, The second welding area and the first welding area are located on the same plane perpendicular to the first direction.

16. An adapter, characterized in that, For use with a battery cell, the adapter has a first connecting surface and a second connecting surface arranged in a first direction and facing away from each other. The first connecting surface includes a connecting groove and is also connected to the tab of the battery cell. The second connecting surface includes a first welding area, which is configured to connect to the electrode terminal of the battery cell. Wherein, along the first direction, the connecting groove at least partially overlaps with the first welding area; the connecting groove includes a first groove segment and a second groove segment arranged and connected along the first direction, the first groove segment being disposed near the opening of the connecting groove; the inner diameter of the first groove segment is smaller than the inner diameter of the second groove segment, so as to form a boss surface at the connection between the first groove segment and the second groove segment.

17. The adapter according to claim 16, characterized in that, The boss surface is perpendicular to the first direction; the inner wall of the first groove segment and / or the inner wall of the second groove segment are arranged parallel to the first direction.

18. The adapter according to claim 16, characterized in that, The boss surface is an annular boss surface; the annular boss surface, the first groove segment, and the second groove segment are coaxially arranged.

19. The adapter according to claim 16, characterized in that, The first dimension of the first groove segment along the first direction is less than or equal to the second dimension of the second groove segment along the first direction.

20. The adapter according to claim 16, characterized in that, The second ratio of the width of the first cross section of the first groove segment along the second direction to the width of the second cross section of the second groove segment along the second direction is 30%-80%, and the second direction is perpendicular to the first direction.

21. A battery device, characterized in that, include: The battery cell according to any one of claims 1 to 15.

22. An electrical appliance, characterized in that, include: The battery device according to claim 21.

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