CN220290877U

CN220290877U - Battery cell, battery and electricity utilization device

Info

Publication number: CN220290877U
Application number: CN202322649293.3U
Authority: CN
Inventors: 苏华圣; 魏曦晨; 郑于炼; 蔡润琛; 杨瑞; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-01-02
Anticipated expiration: 2033-09-28

Abstract

The application discloses a battery monomer, a battery and an electricity utilization device. The battery cell includes a case, an electrode assembly, an electrode terminal, and an adapter. The housing has a first wall. The electrode terminal is mounted to the first wall. The electrode assembly is disposed inside the case. The adapter is positioned inside the first wall, and the adapter connects the electrode terminal and the electrode assembly. Wherein, the electrode terminal is provided with a positioning part for positioning the adapter. The technical scheme provided by the application can improve the reliability of the battery.

Description

Battery cell, battery and electricity utilization device

Technical Field

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

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

In the development of battery technology, how to improve the reliability of a battery is a technical problem to be solved in battery technology.

Disclosure of Invention

The application provides a battery monomer, battery and power consumption device, the technical scheme that this application provided can improve the reliability of battery.

The application is realized by the following technical scheme:

in a first aspect, the present application provides a battery cell including a housing, an electrode assembly, an electrode terminal, and an adapter. The housing has a first wall. The electrode terminal is mounted to the first wall. The electrode assembly is disposed inside the case. The adapter is positioned inside the first wall, and the adapter connects the electrode terminal and the electrode assembly. Wherein, the electrode terminal is provided with a positioning part for positioning the adapter.

In the above scheme, through setting up location portion on electrode terminal, can fix a position the adaptor effectively for adaptor and electrode terminal weld with correct gesture, with reduce because of the rosin joint (the rosin joint can understand that welding quality is not high, welding is not in place etc.) between adaptor and the electrode terminal leads to adaptor and electrode terminal electrical connection inefficacy and causes the inside risk of breaking circuit of battery monomer, makes the battery have higher reliability.

According to some embodiments of the present application, the adapter is provided with a positioning mating portion, the positioning mating portion and the positioning portion being mated with each other.

In the above scheme, through setting up the location cooperation portion that can mutually support with the location portion at the adaptor, can improve the positioning accuracy between adaptor and the electrode terminal effectively to reduce effectively and lead to the risk of adaptor and electrode terminal electrical connection inefficacy because of the rosin joint, make the battery have higher reliability.

According to some embodiments of the present application, one of the positioning portion and the positioning mating portion includes a positioning groove, and the other includes a positioning protrusion.

In the above scheme, one of the positioning part and the positioning matching part is limited to comprise the positioning groove, and the other one of the positioning part and the positioning matching part is limited to comprise the positioning protrusion, so that the adaptor and the electrode terminal are mutually positioned and matched through the concave-convex structure, the positioning precision between the adaptor and the electrode terminal can be effectively improved, the risk of electric connection failure of the adaptor and the electrode terminal caused by cold joint is effectively reduced, and the battery has higher reliability.

According to some embodiments of the present application, the number of the positioning portions and the positioning matching portions is multiple, the positioning portions are arranged at intervals, and the positioning matching portions and the positioning portions are in one-to-one correspondence.

In the scheme, the positioning precision between the adapter and the electrode terminal can be improved by arranging the positioning parts and the positioning matching parts, so that the risk of failure in electrical connection between the adapter and the electrode terminal caused by cold joint is effectively reduced, and the battery has higher reliability.

According to some embodiments of the present application, the electrode terminal has a first surface facing the electrode assembly in a thickness direction of the first wall. The positioning part comprises a positioning protrusion protruding from the first surface, the positioning protrusion and the first surface together define a positioning space, the adapter comprises a terminal connecting part connected with the electrode terminal, and the terminal connecting part is positioned in the positioning space.

In the above aspect, the terminal connection part of the electrode terminal can be positioned in the positioning space by providing the positioning protrusion on the first surface of the electrode terminal and making the positioning protrusion and the first surface form the positioning space together. The adapter can be positioned at the right position relative to the electrode terminal under the constraint of the positioning bulge and the first surface, so that the adapter and the electrode terminal are welded in the right posture, the risk of failure in electrical connection between the adapter and the electrode terminal caused by cold joint is effectively reduced, and the battery has higher reliability.

According to some embodiments of the present application, along the circumference of the first surface, the positioning protrusion surrounds the edge of the first surface, and the positioning protrusion is formed with a notch for avoiding the adapter.

In the above-mentioned scheme, on the one hand, the edge of first surface is located along Zhou Xiangwei on first surface to the location arch, can retrain the adaptor in different positions, improves the positioning accuracy between adaptor and the electrode terminal, reduces the risk of rosin joint, improves the reliability of battery. On the other hand, the notch is formed so that the part of the non-terminal connecting part of the adapter can be positioned outside the positioning space, and the adapter can be connected with the tab of the electrode assembly.

According to some embodiments of the present application, the positioning protrusion extends along a circumferential direction of the first surface and surrounds an edge portion of the first surface. Along the circumference of the first surface, two ends of the positioning bulge are arranged at intervals and form a notch.

In the above-mentioned scheme, the location arch can be along the annular structure of the circumference extension of first surface with breach, can retrain the adaptor in different positions, improves the positioning accuracy between adaptor and the electrode terminal, reduces the risk of rosin joint, improves the reliability of battery.

According to some embodiments of the present application, the positioning protrusion comprises a plurality of sub positioning protrusions, the plurality of sub positioning protrusions are arranged at intervals along the circumferential direction of the first surface, and a gap is formed between two of the plurality of sub positioning protrusions.

In the scheme, the plurality of sub-positioning protrusions are arranged at intervals, so that on one hand, the adaptor can be restrained in different directions, the positioning precision between the adaptor and the electrode terminal is improved, the risk of cold joint is reduced, and the reliability of the battery is improved; on the other hand, the material of the positioning part can be reduced, so that the control of manufacturing cost and the control of battery quality are facilitated.

According to some embodiments of the present application, the adapter further comprises a tab connection portion for connection with a tab of the electrode assembly, the terminal connection portion and the tab connection portion being connected to each other, a width of the tab connection portion being greater than a width of the terminal connection portion.

In the scheme, the width of the lug connection part is set to be larger than that of the terminal connection part, so that on one hand, a larger connection area is formed between the adapter and the lug, the risk that the adapter is separated from the lug is reduced, and the battery has higher reliability; on the other hand, because the width of the tab connection part is larger than that of the terminal connection part, in some embodiments, the portion of the tab connection part exceeding the terminal connection part in the width direction can be used for positioning the positioning protrusion, so that the positioning precision between the adapter and the electrode terminal is improved, the risk of cold welding is reduced, and the reliability of the battery is improved.

According to some embodiments of the present application, the electrode terminal has a first surface facing the electrode assembly in a thickness direction of the first wall, the first surface being formed with a groove. The adapter and the electrode terminal are welded to form a first welding mark, and the first welding mark is not overlapped with the groove along the thickness direction of the first wall.

In some embodiments, the first surface of the electrode terminal is formed with a groove. In order to reduce and to adorn electrode terminal and adaptor because of the location is inaccurate, lead to welding position and recess to overlap to make the at least part of first welding seal fall in the recess, cause electrode terminal and adaptor to take place the rosin joint and lead to electrode terminal and the risk of adaptor electrical connection inefficacy, in the above-mentioned scheme, through setting up location portion on electrode terminal, can fix a position the adaptor effectively, make adaptor and electrode terminal weld with the exact gesture, with the risk that leads to adaptor and electrode terminal electrical connection inefficacy because of the rosin joint is reduced, make the battery have higher reliability.

According to some embodiments of the application, the first solder is disposed around the recess.

In the scheme, through setting up first welding as around in the recess, can improve the area of connection between adaptor and the electrode terminal, improve the connection stability of adaptor and electrode terminal, reduce the risk of electrical connection inefficacy for the battery has higher reliability.

According to some embodiments of the present application, along the thickness direction of the first wall, the electrode terminal is provided with a burring toward one end of the electrode assembly, the burring is pressed against the inner side surface of the first wall, and the burring is provided around the groove. The adapter piece and the flanging part are welded to form a first welding mark.

In the scheme, the flanging part is arranged at one end of the electrode terminal, facing the electrode assembly, so that the connection stability between the electrode terminal and the first wall can be improved, the risk that the electrode terminal is separated from the first wall is reduced, and the battery has higher reliability.

According to some embodiments of the present application, the electrode terminal includes a first terminal portion and a second terminal portion that are disposed separately and connected to each other, the burring portion and the groove are disposed at the first terminal portion, and the first terminal portion and the second terminal portion are configured to cooperatively clamp the first wall to restrict the electrode terminal from being separated from the first wall in a thickness direction of the first wall.

In the scheme, the electrode terminal comprises the first terminal part and the second terminal part which are arranged in a split mode and are connected with each other, so that on one hand, the difficulty in mounting the electrode terminal on the first wall can be effectively reduced, and the manufacturing efficiency of the battery is improved; on the other hand, compared with the scheme of riveting in the first wall, through separately setting and interconnect first terminal portion and second terminal portion, can improve the joint strength of electrode terminal and first wall, reduce the risk that electrode terminal breaks away from in the first wall for the battery has higher reliability.

According to some embodiments of the present application, the positioning portion includes a positioning protrusion protruding from the first surface.

In the above-mentioned scheme, through setting up the location arch at the first surface, can fix a position the adaptor effectively for adaptor and electrode terminal weld with the exact gesture, reduce first welding seal and fall the recess in order to take place the risk of rosin joint, thereby can reduce the risk that leads to the inside circuit breaker of battery monomer because of rosin joint leads to adaptor and electrode terminal electricity to be connected inefficacy, make the battery have higher reliability.

According to some embodiments of the application, the positioning portion does not overlap the groove in the thickness direction of the first wall.

In the above-mentioned scheme, through setting up the location portion to non-overlapping with the recess, that is, the location portion sets up outside the recess, can fix a position the adaptor effectively for adaptor and electrode terminal weld with the exact gesture, reduce first welding seal and fall the recess in order to take place the risk of rosin joint, thereby can reduce the risk that leads to adaptor and electrode terminal electricity to connect inefficacy and cause the inside circuit breaker of battery monomer because of the rosin joint, make the battery have higher reliability.

According to some embodiments of the present application, the positioning portion includes a groove, and a protrusion is formed on a side of the adapter facing the electrode terminal, and the protrusion is in positioning fit with the groove.

In the above scheme, through limiting the locating part to including the recess to can rationally utilize the recess for through the mutual location cooperation of concave-convex structure between adapter and the electrode terminal, can improve the positioning accuracy between adapter and the electrode terminal effectively, reduce the interference of recess to first welding seal, thereby effectively reduce the risk that leads to adapter and electrode terminal electrical connection inefficacy because of the rosin joint, make the battery have higher reliability.

According to some embodiments of the present application, a side of the adapter facing away from the electrode terminal is formed with a recess portion, and the recess portion is disposed corresponding to the protrusion portion.

In the scheme, the concave part is formed on one side of the adapter, which is far away from the electrode terminal, so that the quality of the adapter can be effectively reduced, and the quality energy density of the battery can be improved.

According to some embodiments of the present application, the electrode terminal includes a first terminal part and a second terminal part that are separately provided, the first terminal part and the second terminal part are arranged and connected in a thickness direction of the first wall, at least part of the first terminal part is located at a side of the first wall facing the electrode assembly, at least part of the second terminal part is located at a side of the first wall facing away from the electrode assembly, and the first terminal part and the second terminal part are configured to cooperatively clamp the first wall to restrict the electrode terminal from being separated from the first wall in the thickness direction of the first wall.

At present, the electrode terminal may be assembled to the first wall through a riveting process, for example, in a riveting process, the riveting plug may abut against an end surface of the electrode terminal, which is far away from the electrode assembly, from an outer side surface of the first wall toward an inner side surface, so as to be capable of forming a flange portion pressed against the outer side surface of the first wall. However, since the area of the burring is small due to the limitation of the caulking process, the connection strength between the electrode terminal and the first wall is weak, and the electrode terminal is easily separated from the first wall, affecting the reliability of the battery.

For this reason, in the above-mentioned scheme, set up electrode terminal to including the first terminal portion and the second terminal portion of components of a whole that can function independently setting and interconnect to make electrode terminal can design the part that the area is great and can compress tightly in first wall, in order to improve electrode terminal and first wall's joint strength, reduce electrode terminal and break away from in first wall's risk, make the battery have higher reliability.

According to some embodiments of the application, the projection of the first terminal portion and the projection of the second terminal portion do not overlap in a second direction, which is any direction perpendicular to the thickness direction of the first wall.

In the above scheme, the projection of the first terminal part and the projection of the second terminal part are not overlapped, so that the difficulty in assembling the first terminal part and the second terminal part on the first wall can be reduced, the manufacturing efficiency of the battery cell is improved, and the manufacturing efficiency of the battery is further improved.

According to some embodiments of the present application, the first terminal portion is provided with a positioning portion.

In the above scheme, through setting up location portion at first terminal portion, can make adaptor and electrode terminal weld with the exact gesture to reduce the risk that leads to the inside circuit breaker of battery monomer because of the rosin joint leads to adaptor and electrode terminal electrical connection inefficacy, make the battery have higher reliability.

In a second aspect, some embodiments of the present application further provide a battery, the battery including the battery cell provided in the first aspect.

In a third aspect, some embodiments of the present application further provide an electrical device, the electrical device including a battery cell as provided in the first aspect, the battery cell being configured to provide electrical energy.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

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

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

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

FIG. 3 is an exploded perspective view of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of a partial structure of a battery cell according to some embodiments of the present application;

FIG. 5 is a schematic view of a partial structure of a battery cell according to other embodiments of the present application;

FIG. 6 is a schematic view of a first wall, electrode terminals, and an adapter according to other embodiments of the present application;

FIG. 7 is a schematic view of a first wall, electrode terminals and an adapter according to other embodiments of the present application;

FIG. 8 is a schematic view of the internal structure of the first wall, electrode terminal and adapter according to some embodiments of the present application;

fig. 9 is a schematic view showing the internal structure of the first wall, the electrode terminal and the adapter according to other embodiments of the present application;

fig. 10 is a schematic view of a partial structure of a battery cell according to some embodiments of the present application.

Icon: 10-battery cell; 11-a housing; 110-a first wall; 1100-mounting holes; 111-a housing; 12-electrode terminals; 120-a first surface; 1200-grooves; 1201-first side; 1202-a second side; 1203-third side; 121-a burring part; 122-a first terminal portion; 123-a second terminal portion; 13-an electrode assembly; 14-an adapter; 140-terminal connection parts; 141-tab connection; 142-an intermediate connection; 143-a protrusion; 144-depressions; 15-a positioning part; 150-positioning the protrusions; 1500-sub-positioning protrusions; 151-positioning space; 152-notch; 16-positioning mating part; 160-positioning grooves; 17-first welding; 18-an insulating member; 19-an insulator; z-the thickness direction of the first wall; 1000-vehicle; 100-cell; 200-a controller; 300-motor; 20-a box body; 21-a first tank body; 22-second tank body.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

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

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

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

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

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

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

In the present application, the battery cell may include a lithium ion battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc., which is not limited in the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell includes a housing, an electrode assembly and an electrolyte, the electrode assembly being disposed inside the housing. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a diaphragm. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene). The diaphragm has electronic insulation and is used for isolating adjacent positive pole pieces and negative pole pieces and preventing the adjacent positive pole pieces and negative pole pieces from being short-circuited. The diaphragm has a large number of through micropores, can ensure free passage of electrolyte ions, and has good permeability to lithium ions.

In some embodiments, the first wall of the housing is mounted with an electrode terminal connected with the tab through an adapter to achieve external charging and discharging of the battery cell.

In the development of battery technology, how to improve the reliability of a battery is a technical problem to be solved in battery technology. The battery cell often has the problem that the electric connection between the electrode terminal and the adapter fails, so that the inside of the battery cell is broken, and the reliability of the battery is affected. In the manufacturing process of the battery, because no positioning structure exists between the electrode terminal and the adapter, the problems of inaccurate welding position, insufficient welding of the electrode terminal and the adapter, and failure of electric connection between the electrode terminal and the adapter easily exist in the process of welding the electrode terminal and the adapter, and the reliability of the battery is affected.

In view of this, in order to improve the problem that the electrical connection between the electrode terminal and the adapter is failed due to the cold joint, which affects the reliability of the battery, some embodiments of the present application provide a battery cell including a case, an electrode assembly, and an adapter. The housing has a first wall. The electrode terminal is mounted to the first wall. The electrode assembly is disposed inside the case. The adapter connects the electrode terminal and the electrode assembly. Wherein, the electrode terminal is provided with a positioning part for positioning the adapter.

In the above scheme, through setting up location portion on electrode terminal, can fix a position the adaptor effectively for adaptor and electrode terminal weld with correct gesture, with reduce the risk that leads to the inside circuit breaker of battery monomer because of the rosin joint leads to adaptor and electrode terminal electricity to be connected inefficacy, make the battery have higher reliability.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. A power supply system having a battery cell, a battery, or the like disclosed in the present application, which constitutes the power utilization device, may be used.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present application as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, at the head of the vehicle 1000, or at the rear of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operation power source or a use power source of the vehicle 1000, or the like. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

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

Referring to fig. 2, fig. 2 is an exploded perspective view of a battery 100 according to some embodiments of the present application, where the battery 100 includes a case 20 and a battery cell 10, and the battery cell 10 is configured to be received in the case 20.

The case 20 is used to provide an assembly space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first case body 21 and a second case body 22, the first case body 21 and the second case body 22 being overlapped with each other, the first case body 21 and the second case body 22 together defining an assembly space for accommodating the battery cell 10. The second box body 22 may have a hollow structure with one end opened, the first box body 21 may have a plate-shaped structure, and the first box body 21 covers the open side of the second box body 22, so that the first box body 21 and the second box body 22 define an assembly space together; the first tank body 21 and the second tank body 22 may each have a hollow structure with one side opened, and the open side of the first tank body 21 may be closed to the open side of the second tank body 22.

Of course, the case 20 formed by the first case body 21 and the second case body 22 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or a square, etc. Illustratively, in fig. 2, the case 20 is rectangular in shape.

In the battery 100, the number of the battery cells 10 provided in the case 20 may be one or more. When there are a plurality of battery cells 10 disposed in the case 20, the plurality of battery cells 10 may be connected in series or parallel or a series-parallel connection, and the series-parallel connection means that there are both series connection and parallel connection among the plurality of battery cells 10. The plurality of battery cells 10 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 10 is accommodated in the box body 20; of course, the battery 100 may also be a battery module form formed by connecting a plurality of battery cells 10 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole, and integrally accommodated in the case 20.

In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include a bus member for connecting the plurality of battery cells 10 to achieve electrical connection between the plurality of battery cells 10.

Wherein each battery cell 10 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 10 may be in the shape of a cylinder, prism, or other shape, etc.

Referring to fig. 3 and 4, fig. 3 is an exploded perspective view of the battery cell 10 according to some embodiments of the present application, and fig. 4 is a schematic view of a partial structure of the battery cell 10 according to some embodiments of the present application.

The battery cell 10 includes a case 11, an electrode assembly 13, an electrode terminal 12, and an adapter 14. The housing 11 has a first wall 110. The electrode terminal 12 is mounted to the first wall 110. The electrode assembly 13 is disposed inside the case 11. The adapter 14 is positioned inside the first wall 110, and the adapter 14 connects the electrode terminal 12 and the electrode assembly 13. Wherein the electrode terminal 12 is provided with a positioning portion 15 for positioning the adapter 14.

The case 11 is a member for accommodating the electrode assembly 13, and the case 11 may also be used for accommodating an electrolyte such as an electrolytic solution. Referring to fig. 3, in some embodiments, the housing 11 includes a shell 111 and an end cap. The inside of the case 111 is formed with a receiving chamber for receiving the electrode assembly 13, the case 111 has an opening communicating with the receiving chamber, and an end cap is capped at the opening of the case 111 and forms a sealing connection to form a sealing space for receiving the electrode assembly 13 and electrolyte. Alternatively, the housing 11 may further include a bottom plate, and both ends of the case 111 are respectively formed with openings, one of which is closed by the end cap and the other of which is closed by the bottom plate.

In some embodiments, the material of the housing 11 may be metal or a combination of metal and nonmetal, for example, the housing 11 may be made of metal, such as aluminum, copper, iron, steel or aluminum alloy; for another example, a portion of the housing 11 may be made of metal, and the remaining portion may be made of non-metal, e.g., an end cap of the housing 11 may be made of metal, and the shell 111 or other portions of the housing 11 may be made of non-metal material.

In some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed into the case 111, and the case 111 may be filled with an electrolyte, and then the end cap may be covered on the opening of the case 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the case 111, then the end cap is covered on the opening of the case 111, then the electrolyte is filled into the case 111 through the electrolyte injection hole on the end cap or other parts of the case 11, and then the electrolyte injection hole is closed to complete the assembly of the battery cell 10.

The housing 11 may be of various shapes, such as a cylinder or a prismatic structure, etc. The shape of the case 11 may be determined according to the specific shape of the electrode assembly 13. For example, if the electrode assembly 13 has a cylindrical structure, the case 11 having a cylindrical structure may be selected; if the electrode assembly 13 is a square electrode assembly 13, a square can 11 may be used.

The first wall 110 is a partial structure of the case 11, and the first wall 110 may be mounted with an electrode terminal 12, and the electrode terminal 12 may be connected with a tab of the electrode assembly 13 through an adapter 14. In some embodiments, the first wall 110 may be insulatively mounted to the electrode terminal 12, for example, an insulating member 18 is provided between the electrode terminal 12 and the first wall 110, and the insulating member 18 insulates the electrode terminal 12 from the first wall 110. In some embodiments, the first wall 110 may be mounted to the electrode terminal 12, for example, the first wall 110 is directly mounted to the electrode terminal 12, and in this case, the first wall 110 may be made of a conductive material or an insulating material.

In some embodiments, the first wall 110 may be made of a conductive material, for example, a metal material, such as aluminum, copper, iron, aluminum, steel, or an aluminum alloy. In other embodiments, the first wall 110 may be made of a non-metallic material, such as plastic or the like.

In some embodiments, the first wall 110 may be an end cap of the housing 11. The shell 111 of the housing 11 encloses the edge of the first wall 110. The first wall 110 may be coupled to the shell 111 of the housing 11 by welding, bonding, clamping or other coupling means. Alternatively, the first wall 110 and the housing 111 may be integrally formed.

The electrode terminal 12 is a member mounted to the first wall 110, and the electrode terminal 12 may be connected to a tab of the electrode assembly 13 through the adapter 14 for allowing current to flow in or out of the tab through the electrode terminal 12. In some embodiments, the electrode terminal 12 may have a cylindrical structure, or a polygonal prismatic structure. In some embodiments, the electrode terminal 12 is made of a metal material, for example, made of aluminum, copper, iron, steel, an alloy, or a composite metal.

The electrode assembly 13 is a component in which electrochemical reactions occur in the battery cell 10. The structure of the electrode assembly 13 may be various, and the electrode assembly 13 may be a roll-type structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, and the main body of the electrode assembly 13 may have a cylindrical shape, for example. The main material of the diaphragm can be at least one selected from glass fiber, non-woven fabrics, polyethylene, polypropylene and polyvinylidene fluoride. The tab of the electrode assembly 13 may include a first tab and a second tab having opposite polarities. In some embodiments, the electrode terminals 12 of the battery cells 10 may be disposed corresponding to the first tab, e.g., the electrode terminals 12 may be connected to the first tab through the adapter 14. In some embodiments, the electrode terminals 12 of the battery cell 10 may be disposed corresponding to the second tab, e.g., the electrode terminals 12 may be connected to the second tab through the adapter 14. In some embodiments, the number of electrode terminals 12 of the battery cell 10 may be two, one of the electrode terminals 12 may be disposed corresponding to the first tab, and the other electrode terminal 12 may be disposed corresponding to the second tab. In some embodiments of the present application, the battery cell 10 includes two electrode terminals 12, and the two electrode terminals 12 are spaced apart on the first wall 110. One of the electrode terminals 12 is hereinafter exemplified.

The adapter 14 is a member connecting the electrode assembly 13 and the electrode terminal 12, and for example, the adapter 14 connects the tab of the electrode assembly 13 and the electrode terminal 12. By "the adapter 14 is located inside the first wall 110" it is understood that the entire adapter 14 is located inside the first wall 110, and the adapter 14 may not interfere with the first wall 110 in the thickness direction of the first wall 110, so as to reduce the risk of the adapter 14 overlapping the first wall 110 to cause internal short-circuiting of the battery. Meanwhile, the adaptor 14 is located on the inner side of the first wall 110, so that the positioning assembly of the adaptor 14 and the electrode terminal 12 is facilitated, and the assembly efficiency of the battery cell is improved.

In some embodiments, referring to fig. 4, the adapter 14 may include a terminal connection part 140 and a tab connection part 141 connected to each other, the terminal connection part 140 connecting the electrode terminals 12, and the tab connection part 141 connecting the tabs of the electrode assembly 13. The terminal connection part 140 may be welded to the electrode terminal 12, for example, the terminal connection part 140 and the electrode terminal 12 may be connected by laser welding. In some embodiments, the electrode terminal 12 is made of a metal material, for example, made of aluminum, copper, iron, steel, an alloy, or a composite metal.

In some embodiments, the first wall 110 may further be provided with an insulating member 19, and the insulating member 19 may be used to insulate the adaptor 14 from the first wall 110.

The positioning portion 15 is a member provided on the electrode terminal 12. The function of the positioning portion 15 includes for positioning the adapter 14. The function of positioning the adaptor 14 includes locating the relative positional relationship of the adaptor 14 and the electrode terminal 12 at a predetermined point so that the welding mark is at the correct position when the adaptor 14 and the electrode terminal 12 are welded, so that the welding quality and the connection stability of the adaptor 14 and the electrode terminal 12 are high. It is to be understood that the "the relative positional relationship of the relay member 14 and the electrode terminal 12 is at the preset point" may be understood from not being at the preset point, for example, in some embodiments, the surface of the electrode terminal 12 facing the relay member 14 is formed with a groove 1200, when the relay member 14 and the electrode terminal 12 are not positioned in place, there is a case where the action position of the laser at the time of welding falls in the groove 1200, resulting in the welded portion falling in the groove 1200, which may cause the cold welding of the relay member 14 and the electrode terminal 12, there is a problem that the welding quality is low, and the connection of the relay member 14 and the electrode terminal 12 fails. For another example, in some embodiments, when the adapter 14 and the electrode terminal 12 are not positioned in place, there is a case where the action position of the laser at the time of welding falls outside the adapter 14 and/or the electrode terminal 12, resulting in a welded portion falling outside the adapter 14 and/or the electrode terminal 12, which may cause a cold joint of the adapter 14 and the electrode terminal 12, there is a problem that the welding quality is low, and the connection of the adapter 14 and the electrode terminal 12 is failed.

In some embodiments, the positioning portion 15 may include a protrusion provided on the electrode terminal 12 for restraining the adapter 14 to position the adapter 14. For example, the raised wall can constrain the wall of the adapter 14 to achieve positioning of the adapter 14. In other embodiments, the positioning portion 15 may include a protrusion and/or a recess, and the adaptor 14 is correspondingly provided with a recess and/or a protrusion, and positioning is achieved by matching the concave-convex structure between the positioning portion 15 and the adaptor 14. In other embodiments, the positioning portion 15 may include a protrusion provided on the electrode terminal 12 for restraining the adapter 14 to position the adapter 14; and, the positioning portion 15 may include a protrusion and/or a recess, and the adaptor 14 is correspondingly provided with a recess and/or a protrusion, and the positioning portion 15 and the adaptor 14 are matched by a concave-convex structure to realize positioning.

In the above scheme, through setting up location portion 15 on electrode terminal 12, can effectively fix a position adapter 14 for adapter 14 and electrode terminal 12 weld with the exact gesture, with the risk that leads to the inside circuit breaker of battery cell 10 because of the rosin joint leads to adapter 14 and electrode terminal 12 electrical connection inefficacy, makes the battery have higher reliability.

According to some embodiments of the present application, referring to fig. 4, the adaptor 14 is provided with a positioning engaging portion 16, and the positioning engaging portion 16 is engaged with the positioning portion 15.

The positioning engaging portion 16 is a member provided on the adapter 14. The positioning engaging portion 16 is for engaging with the positioning portion 15 for positioning the adapter 14.

In some embodiments, the positioning portion 15 and the positioning mating portion 16 may include mating male and female structures, such as recessed grooves and protrusions, latches and latch holes, and the like. Illustratively, referring to fig. 4, the positioning part 15 may include a protrusion provided at an end surface of the electrode terminal 12 facing the adapter 14, and the positioning mating part 16 may include a recess groove or a through hole provided at the adapter 14.

In the above scheme, the positioning accuracy between the adaptor 14 and the electrode terminal 12 can be effectively improved by arranging the positioning matching part 16 which can be matched with the positioning part 15 on the adaptor 14, so that the risk of failure in electrical connection between the adaptor 14 and the electrode terminal 12 due to cold welding is effectively reduced, and the battery has higher reliability.

According to some embodiments of the present application, one of the positioning portion 15 and the positioning mating portion 16 includes a positioning groove 160, and the other includes a positioning protrusion 150.

The positioning engaging portion 16 and the positioning portion 15 include concave-convex structures engaged with each other, the positioning protrusion 150 may be a convex block structure, and the positioning protrusion 150 may be cylindrical, prismatic, or other shapes. The positioning groove 160 is a groove-like structure that mates with the positioning protrusion 150. The positioning groove 160 may be a blind hole formed at the surface of the adapter 14 facing the electrode terminal 12, or may be a through hole formed at the adapter 14.

In some embodiments, the positioning portion 15 includes a positioning protrusion 150 and the positioning mating portion 16 includes a positioning groove 160. In some embodiments, the positioning portion 15 may include a positioning groove 160 and the positioning mating portion 16 includes a positioning protrusion 150. In other embodiments, the positioning portion 15 may include a positioning groove 160 and a positioning protrusion 150, the positioning engaging portion 16 includes a positioning protrusion 150 and a positioning groove 160, the positioning groove 160 of the positioning portion 15 engages with the positioning protrusion 150 of the positioning engaging portion 16, and the positioning protrusion 150 of the positioning portion 15 engages with the positioning groove 160 of the positioning engaging portion 16.

In some embodiments, when the positioning portion 15 includes the positioning protrusion 150, the positioning protrusion 150 may be made of the same material as or different from the electrode terminal 12, for example, the positioning protrusion 150 is made of a metal material such as aluminum, copper, iron, steel, alloy, or composite metal, and for example, the positioning protrusion 150 is made of a non-metal material such as plastic. In some embodiments, the positioning protrusion 150 may be connected with the electrode terminal 12 by bonding, welding, screw connection, or the like. In other embodiments, the positioning protrusion 150 may also be integrally manufactured with the electrode terminal 12. In some embodiments, when the positioning portion 15 includes the positioning groove 160, the positioning groove 160 may be formed at the electrode terminal 12 through a punching process, a hollowing process, or other processes, or the positioning groove 160 may be formed based on the formation of the electrode terminal 12, for example, when the electrode terminal 12 is formed by casting, the positioning groove 160 is simultaneously formed. Or the electrode terminal 12 is formed at the electrode terminal 12 by a process of assembling the electrode terminal 12 to the first wall 110, for example, the electrode terminal 12 is fixed to the first wall 110 by caulking, and the positioning groove 160 is a groove 1200 formed by the caulking process.

In some embodiments, when the positioning mating portion 16 includes the positioning protrusion 150, the positioning protrusion 150 may be made of the same material as or different from the adaptor 14, for example, the positioning protrusion 150 is made of a metal material, such as aluminum, copper, iron, steel, alloy, composite metal, and for example, the positioning protrusion 150 is made of a non-metal material, such as plastic. In some embodiments, the locating boss 150 may be attached to the adapter 14 by adhesive, welding, threaded connection, or the like. In other embodiments, the locating boss 150 may also be integrally formed with the adapter 14. In some embodiments, when the positioning portion 15 includes the positioning groove 160, the positioning groove 160 may be formed in the adapter 14 by stamping, hole digging, or other process, or the positioning groove 160 may be formed based on the formation of the adapter 14, such as the adapter 14 being formed by casting, the positioning groove 160 being formed when the adapter 14 is cast.

In the above-mentioned scheme, by defining one of the positioning portion 15 and the positioning mating portion 16 to include the positioning groove 160 and the other to include the positioning protrusion 150 so that the adaptor 14 and the electrode terminal 12 are positioned and mated with each other through the concave-convex structure, the positioning accuracy between the adaptor 14 and the electrode terminal 12 can be effectively improved, so that the risk of failure of the electrical connection between the adaptor 14 and the electrode terminal 12 due to the cold welding is effectively reduced, and the battery has higher reliability.

According to some embodiments of the present application, referring to fig. 4, the number of the positioning portions 15 and the number of the positioning engaging portions 16 are all plural, the positioning portions 15 are arranged at intervals, and the positioning engaging portions 16 are in one-to-one correspondence with the positioning portions 15.

In some embodiments, the number of positioning portions 15 may be two, three, or more. Correspondingly, the number of the positioning engaging portions 16 may be two, three or more. The corresponding number of positioning portions 15 and positioning engaging portions 16 engage with each other.

The "a plurality of positioning portions 15 are disposed at intervals" means that the positioning portions 15 are spaced apart from each other, independently of each other, to achieve different positioning points between the adapter 14 and the electrode terminal 12.

For example, referring to fig. 4, the end surface of the electrode terminal 12 facing the adapter 14 is formed with a groove 1200, and the positioning portion 15 includes two positioning protrusions 150, the two positioning protrusions 150 being disposed at intervals on the periphery of the groove 1200, for example, the two positioning protrusions 150 being disposed symmetrically based on the groove 1200.

In the above scheme, by arranging the plurality of positioning parts 15 and the plurality of positioning matching parts 16, the positioning accuracy between the adapter 14 and the electrode terminal 12 can be improved, so that the risk of failure in electrical connection between the adapter 14 and the electrode terminal 12 due to cold welding is effectively reduced, and the battery has higher reliability.

Referring to fig. 5 and 6, fig. 5 is a schematic view of a partial structure of a battery cell 10 according to other embodiments of the present application, and fig. 6 is a schematic view of a first wall 110, an electrode terminal 12, and an adapter 14 according to other embodiments of the present application.

Along the thickness direction z of the first wall, the electrode terminal 12 has a first surface 120 facing the electrode assembly 13. The positioning part 15 includes a positioning protrusion 150 protruding from the first surface 120, the positioning protrusion 150 and the first surface 120 together defining a positioning space 151, and the adapter 14 includes a terminal connection part 140 connected to the electrode terminal 12, the terminal connection part 140 being positioned in the positioning space 151.

The first surface 120 is a surface of the electrode terminal 12 facing the electrode assembly 13 in the thickness direction z of the first wall. The first surface 120 may be used to connect with the adapter 14, e.g., the first surface 120 may be welded to the adapter 14. In some embodiments, the first surface 120 may be a bottom surface of the electrode terminal 12.

The terminal connection part 140 is a portion where the adapter 14 is connected to the electrode terminal 12, and the terminal connection part 140 may be welded to the first surface 120.

By "the positioning portion 15 includes the positioning protrusion 150" it is understood that the positioning portion 15 includes at least the positioning protrusion 150, for example, the positioning portion 15 includes a positioning protrusion, and may include other structures for positioning the adapter 14. The positioning protrusion 150 is a part protruding from the first surface 120, the positioning protrusion 150 may form a positioning space 151 together with the first surface 120, the terminal connection part 140 of the adapter 14 may be positioned in the positioning space 151 when the adapter 14 and the electrode terminal 12 are assembled, the first surface 120 may be in contact with the surface of the terminal connection part 140, and the positioning protrusion 150 may be connected to the side to which the terminal is connected.

In the above-described aspects, the terminal connection part 140 of the electrode terminal 12 can be positioned in the positioning space 151 by providing the positioning protrusion 150 at the first surface 120 of the electrode terminal 12 and allowing the positioning protrusion 150 and the first surface 120 to form the positioning space 151 together. The adaptor 14 can be positioned at a correct position relative to the electrode terminal 12 by the positioning protrusion 150 and the first surface 120, so that the adaptor 14 and the electrode terminal 12 are welded at a correct posture, thereby effectively reducing the risk of failure of electrical connection between the adaptor 14 and the electrode terminal 12 due to cold welding, and enabling the battery to have higher reliability.

According to some embodiments of the present application, referring to fig. 5 and 6, along the circumference of the first surface 120, the positioning protrusion 150 is disposed around the edge of the first surface 120, and the positioning protrusion 150 is formed with a notch 152, where the notch 152 is used to avoid the adapter 14.

The first surface 120 may be a portion where the electrode terminal 12 is connected to the adapter 14. The positioning protrusion 150 is surrounded on the edge of the first surface 120, it is understood that the positioning protrusion 150 can be disposed around a portion of the wall surface of the portion of the electrode terminal 12 where the electrode terminal 12 is connected to the adapter 14 to contact the wall surface of the adapter 14 to position the adapter 14.

The positioning protrusion 150 is formed at the notch 152, which means that the positioning protrusion 150 does not completely surround the first surface 120, and the notch 152 can be left to avoid the portion of the adapter 14 that is not connected to the electrode terminal 12. Illustratively, the adapter 14 may include a terminal connection part 140 and a tab connection part 141, the terminal connection part 140 being located in the positioning space 151, the tab connection part 141 being escaped from the notch 152 and being located outside the positioning space 151 to be connected with the tab of the electrode assembly 13.

In some embodiments, referring to fig. 6, the first surface 120 may be square, and the positioning protrusions 150 may extend along an edge of the first surface 120 and be disposed on three sides of the first surface 120, and the other side of the first surface 120 is not disposed with the positioning protrusions 150 to form the notch 152. In other embodiments, the first surface 120 may be square, and the positioning protrusion 150 may include a plurality of sub-protrusions spaced along an edge of the first surface 120, e.g., the positioning protrusion 150 may include three sub-protrusions disposed on three sides of the first surface 120, respectively, and the other side of the first surface 120 may not be provided with sub-protrusions to form the notch 152.

In the above-mentioned scheme, on the one hand, the positioning protrusion 150 is disposed along the Zhou Xiangwei of the first surface 120 at the edge of the first surface 120, so as to constrain the adapter 14 in different orientations, improve the positioning accuracy between the adapter 14 and the electrode terminal 12, reduce the risk of cold welding, and improve the reliability of the battery. On the other hand, the notch 152 is formed so that the portion of the non-terminal connection part 140 of the adapter 14 can be located outside the positioning space 151 so that the adapter 14 can be connected with the tab of the electrode assembly 13.

According to some embodiments of the present application, referring to fig. 6, the positioning protrusion 150 extends along a circumferential direction of the first surface 120 and surrounds an edge portion of the first surface 120. The positioning protrusions 150 are spaced apart at both ends along the circumference of the first surface 120 and form notches 152.

In some embodiments, the first surface 120 may be square, the positioning protrusion 150 extending along the circumference of the first surface 120, it being understood that the extending track of the positioning protrusion 150 may be part of a square track, for example in fig. 6, the positioning protrusion 150 extends along three interconnected edges of the first surface 120, the positioning protrusion 150 having a "" shaped structure. In other embodiments, the first surface 120 may be circular, and the positioning protrusion 150 extends along a circumferential direction of the first surface 120, which may be understood that an extending track of the positioning protrusion 150 may be a portion of a circular track, and the positioning protrusion 150 may be in a circular arc shape.

Referring to fig. 6, the positioning protrusion 150 is a unitary structure, and may include a first section, a second section, and a third section connected to each other, the second section and the third section being connected to opposite ends of the first section, respectively, and being in contact with different wall surfaces of the terminal connection part 140, respectively.

In the above-mentioned scheme, the positioning protrusion 150 may be an annular structure with a notch 152 extending along the circumferential direction of the first surface 120, so as to constrain the adapter 14 in different directions, improve the positioning accuracy between the adapter 14 and the electrode terminal 12, reduce the risk of cold welding, and improve the reliability of the battery.

Referring to fig. 7, fig. 7 is a schematic view of the first wall 110, the electrode terminal 12, and the adapter 14 according to some embodiments of the present application.

The positioning protrusion 150 includes a plurality of sub-positioning protrusions 1500, the plurality of sub-positioning protrusions 1500 are disposed at intervals along the circumferential direction of the first surface 120, and a gap 152 is formed between two sub-positioning protrusions 1500 of the plurality of sub-positioning protrusions 1500.

The sub-positioning protrusions 1500 may be independent protrusions, and a plurality of independent sub-positioning protrusions 1500 may be disposed at intervals along the circumference of the first surface 120 and may contact different wall surfaces of the terminal connection part 140 to position the adaptor 14. Illustratively, referring to fig. 7, the first surface 120 is square, and the first surface 120 may include a first side 1201, a second side 1202, and a third side 1203. The first side 1201 is an edge of the first surface 120 in the length direction of the first wall 110, and the first side 1201 is distant from the middle of the first wall 110, and the second side 1202 and the third side 1203 are two edges in the width direction of the first wall 110. The number of the sub-positioning protrusions 1500 is three, and the three sub-positioning protrusions 1500 are respectively disposed on the first side 1201, the second side 1202 and the third side 1203.

In the above-mentioned scheme, by arranging the plurality of sub-positioning protrusions 1500 which are arranged at intervals, on one hand, the adaptor 14 can be restrained in different directions, the positioning precision between the adaptor 14 and the electrode terminal 12 is improved, the risk of cold joint is reduced, and the reliability of the battery is improved; on the other hand, the material of the positioning portion 15 can be reduced to facilitate control of manufacturing cost and control of battery quality.

According to some embodiments of the present application, reference may be made to fig. 6. The adapter 14 further includes a tab connection part 141 for connection with the tab of the electrode assembly 13, the terminal connection part 140 and the tab connection part 141 being connected to each other, the tab connection part 141 having a width greater than that of the terminal connection part 140.

The adapter 14 includes a terminal connection part 140 and a tab connection part 141, the terminal connection part 140 being connected with the electrode terminal 12, for example, the terminal connection part 140 being welded with the first surface 120 of the electrode terminal 12. The tab connection part 141 is connected to the tab of the electrode assembly 13, for example, the tab connection part 141 is welded to the tab.

The terminal connection part 140 and the tab connection part 141 may be disposed along the length direction of the adapter 14. The width direction of the adapter 14 may be perpendicular to the length direction of the adapter 14.

The "the tab connection part 141 has a width greater than that of the terminal connection part 140" is understood to mean that the tab connection part 141 has a size greater than that of the terminal connection part 140 in the width direction of the adapter 14.

In some embodiments, referring to fig. 6, the adaptor 14 may further include an intermediate connection portion 142, where the intermediate connection portion 142 connects the terminal connection portion 140 and the tab connection portion 141, and the intermediate connection portion 142 may have a width greater than that of the terminal connection portion 140, and the intermediate connection portion 142 has an abutment surface facing the positioning protrusion 150, and the abutment surface may be used to abut the positioning protrusion 150, so as to improve positioning accuracy of the adaptor 14 compared to the electrode terminal 12.

In the above-mentioned scheme, by setting the width of the tab connection portion 141 to be larger than the width of the terminal connection portion 140, on one hand, a larger connection area between the adapter 14 and the tab can be provided, the risk that the adapter 14 is separated from the tab is reduced, and the battery has higher reliability; on the other hand, since the tab connection portion 141 has a larger width than the terminal connection portion 140, in some embodiments, the portion of the tab connection portion 141 beyond the terminal connection portion 140 in the width direction may be used to locate at the locating protrusion 150, thereby improving the locating precision between the adapter 14 and the electrode terminal 12, reducing the risk of cold welding, and improving the reliability of the battery.

In other embodiments, the tab connection portion 141 may have a width less than or equal to the width of the terminal connection portion 140.

According to some embodiments of the present application, referring to fig. 4 and 5, the electrode terminal 12 has a first surface 120 facing the electrode assembly 13 in a thickness direction z of the first wall, and the first surface 120 is formed with a groove 1200. The adapter 14 is welded to the electrode terminal 12 to form a first weld 17, and the first weld 17 does not overlap the groove 1200 in the thickness direction z of the first wall.

The first surface 120 may be a surface of the electrode terminal 12 facing the electrode assembly 13, and the first surface 120 may be welded with the adapter 14 and form the first welding mark 17.

The recess 1200 is a groove-like structure formed in the first surface 120. In some embodiments, to increase the mass energy density of the battery cell 10, the surface may be grooved to reduce the mass of the electrode terminal 12. In some embodiments, due to the assembly process, the surface of the electrode terminal 12 is formed with a groove 1200, for example, the electrode terminal 12 may be riveted to the first wall 110, during the riveting process, the riveting head abuts against the first surface 120 from the inner side surface toward the outer side surface of the first wall 110, so as to form a flange portion 121 pressed against the inner side surface of the first wall 110, and the riveting groove generated due to the riveting process is the groove 1200 formed on the first surface 120.

By "the first welding mark 17 does not overlap with the groove 1200 in the thickness direction z of the first wall" it is understood that the portion where the laser acts on the adapter 14 and the electrode terminal 12 does not overlap with the groove 1200 when the adapter 14 and the electrode terminal 12 are welded.

In order to make the first welding mark 17 and the groove 1200 not overlap in the thickness direction z of the first wall, the battery cell 10 is provided with the positioning part 15 to improve the positioning accuracy of the adapter 14 and the electrode terminal 12, and reduce the risk of overlap between the part of the laser acting on the adapter 14 and the electrode terminal 12 and the groove 1200, resulting in a cold joint.

In some embodiments, the first surface 120 of the electrode terminal 12 is formed with a groove 1200. In order to reduce the risk that the electrode terminal 12 and the adapter 14 are electrically connected to fail due to the fact that the electrode terminal 12 and the adapter 14 are in the cold joint due to the fact that the welding positions and the grooves 1200 are overlapped due to inaccurate positioning, so that at least part of the first welding mark 17 falls into the grooves 1200, the adapter 14 can be effectively positioned by arranging the positioning part 15 on the electrode terminal 12, the adapter 14 and the electrode terminal 12 are welded in the correct posture, the risk that the electric connection between the adapter 14 and the electrode terminal 12 fails due to cold joint is reduced, and the battery has high reliability.

According to some embodiments of the present application, referring to fig. 5, a first solder 17 is disposed around the recess 1200.

Illustratively, the shape of the first bond 17 is illustratively shown in an annular pattern in fig. 5. The first solder 17 may be annular and disposed around the recess 1200. In some embodiments, the first weld 17 may completely surround, or semi-surround, the recess 1200. In some embodiments, the first weld 17 may be at least partially annular or at least partially square annular, etc.

In the above scheme, by arranging the first solder 17 to surround the groove 1200, the connection area between the adaptor 14 and the electrode terminal 12 can be increased, the connection stability of the adaptor 14 and the electrode terminal 12 can be improved, the risk of failure of electrical connection can be reduced, and the battery has higher reliability.

In other embodiments, the first bond 17 may include a plurality of sub-bonds spaced around the perimeter of the recess 1200.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating the internal structure of the first wall 110, the electrode terminal 12 and the adaptor 14 according to some embodiments of the present application.

Along the thickness direction z of the first wall, one end of the electrode terminal 12 facing the electrode assembly 13 is provided with a burring part 121, the burring part 121 is pressed against the inner side surface of the first wall 110, and the burring part 121 is disposed around the groove 1200. The adapter 14 is welded to the flange 121 to form the first weld 17.

The burring 121 is a member located at one end of the electrode terminal 12 toward the electrode terminal 12. In some embodiments, the first wall 110 may include the mounting hole 1100, the electrode terminal 12 may include a burring part 121 and a body part, the burring part 121 may be connected with the body part and pressed against an inner side surface of the first wall 110, and the burring part 121 may function to limit the displacement of the electrode terminal 12 in the thickness direction z of the first wall. In some embodiments, the adapter 14 and the cuff 121 are welded and form the first weld 17.

A portion of the body part may be located in the mounting hole 1100, and another portion of the body part may be located at a side of the first wall 110 facing away from the electrode assembly 13, and the other portion may be connected with the bus member. In the battery, the battery cells 10 may be electrically connected by a bus bar member.

The "the burring 121 is disposed around the recess 1200" is understood to mean that the recess 1200 is located in the middle of the burring 121. In some embodiments, the recess 1200 may be disposed coaxially with the mounting hole 1100 of the first wall 110.

In some embodiments, the electrode terminal 12 may be riveted to the first wall 110, and the electrode terminal 12 may include a first portion, a second portion, and a third portion. Along the thickness direction z of the first wall, the first portion, the second portion and the third portion are sequentially connected, the first portion is located at the outer side of the first wall 110, the first portion is pressed against the outer side surface of the first wall 110, the second portion is located in the mounting hole 1100, and the third portion is located at the inner side of the first wall 110. During the caulking process, the caulking plug may abut against the end surface of the third portion facing the electrode assembly 13 from the inner side surface toward the outer side surface of the first wall 110 to enable formation of the burring 121 pressed against the inner side surface of the first wall 110 while forming the groove 1200, with the groove 1200 being at the inner surface of the electrode terminal 12.

In other embodiments, the electrode terminal 12 may be riveted to the first wall 110, but during the riveting process, the riveting plug may abut against the end surface of the first portion from the outer side surface toward the inner side surface of the first wall 110 to form a groove 1200 at the end surface of the first portion, with the groove 1200 being at the outer surface of the electrode terminal 12.

Compared with the two embodiments, namely, compared with the groove 1200 positioned on the outer surface of the electrode terminal 12, the groove 1200 is positioned on the inner surface of the electrode terminal 12, so that the outer surface of the electrode terminal 12 has a larger area and is connected with the bus member, the connection relationship between the battery cell 10 and the bus member is more stable, and the battery has higher reliability.

In the above-mentioned scheme, by providing the flange portion 121 at the end of the electrode terminal 12 facing the electrode assembly 13, the connection stability between the electrode terminal 12 and the first wall 110 can be improved, the risk that the electrode terminal 12 is separated from the first wall 110 is reduced, and the battery has high reliability.

Referring to fig. 9, fig. 9 is a schematic view illustrating the internal structures of the first wall 110, the electrode terminal 12 and the adaptor 14 according to other embodiments of the present application. The electrode terminal 12 includes a first terminal portion 122 and a second terminal portion 123 that are separately provided and connected to each other, and a burring portion 121 and a groove 1200 are provided to the first terminal portion 122, the first terminal portion 122 and the second terminal portion 123 being configured to cooperatively sandwich the first wall 110 to restrict the electrode terminal 12 from being separated from the first wall 110 in a thickness direction z of the first wall.

The "electrode terminal 12 includes the first terminal part 122 and the second terminal part 123 which are separately provided and connected to each other" is understood that the electrode terminal 12 includes two mutually independent portions, one of which is the first terminal part 122 and the other of which is the second terminal part 123, and the first terminal part 122 and the second terminal part 123 may be mutually independent and not connected to each other before the electrode terminal 12 is assembled to the first wall 110. When the electrode terminal 12 is assembled to the first wall 110, the first and second terminal portions 122 and 123 are disposed corresponding to the mounting holes 1100 of the first wall 110, for example, at least one of the first and second terminal portions 122 and 123 extends into the mounting holes 1100 to enable the first and second terminal portions 122 and 123 to be connected to each other, and the first and second terminal portions 122 and 123 are pressed against the outer and inner sides of the first wall 110, respectively.

For example, referring to fig. 9, a portion of the first terminal portion 122 is located on the inner side of the first wall 110, the inner side of the first terminal portion 122 located on the first wall 110 can be pressed against the inner side surface of the first wall 110, and another portion of the first terminal portion 122 is located in the mounting hole 1100. The second terminal portion 123 is partially located outside the first wall 110, and the portion located outside the first wall 110 can be pressed against the outer side surface of the first wall 110, and the other end of the second terminal portion 123 is located in the mounting hole 1100. The portion of the first terminal portion 122 located in the mounting hole 1100 may be connected to the portion of the second terminal portion 123 located in the mounting hole 1100. In some embodiments, "another portion of the first terminal portion 122 is located in the mounting hole 1100" may be interpreted as that the first terminal portion 122 has a portion protruding into the mounting hole 1100 (the protruding portion of the first terminal portion 122 includes positioning in the mounting hole 1100 and connecting with the second terminal portion 123), and for this purpose, the first terminal portion 122 is formed with a recess portion 144 corresponding to the protruding portion of the mounting hole 1100, and the recess portion 144 may be a groove 1200.

The connection relationship between the first terminal portion 122 and the second terminal portion 123 includes, but is not limited to, bonding, welding, clamping, riveting, screw connection, or the like. The portion of the first terminal portion 122 pressed against the inner side surface of the first wall 110 includes a burring portion 121.

In the above-mentioned scheme, by arranging the electrode terminal 12 to include the first terminal part 122 and the second terminal part 123 which are separately arranged and connected to each other, on the one hand, the difficulty in mounting the electrode terminal 12 to the first wall 110 can be effectively reduced, and the manufacturing efficiency of the battery can be improved; on the other hand, compared with the scheme of riveting to the first wall 110, the connection strength between the electrode terminal 12 and the first wall 110 can be improved by separately arranging and mutually connecting the first terminal part 122 and the second terminal part 123, and the risk that the electrode terminal 12 is separated from the first wall 110 is reduced, so that the battery has higher reliability.

Referring to fig. 4-7, the positioning portion 15 includes a positioning protrusion 150 protruding from the first surface 120 according to some embodiments of the present application.

In some embodiments, the positioning portion 15 may include a positioning protrusion 150 disposed on the first surface 120 for constraining the adapter 14 to position the adapter 14. For example, the walls of the locating boss 150 can be constrained against the walls of the adapter 14 to effect locating of the adapter 14. In other embodiments, the positioning portion 15 may include a positioning protrusion 150 disposed on the first surface 120, and the adapter 14 is correspondingly provided with a recess, so that the positioning portion 15 and the adapter 14 are matched to achieve positioning through a concave-convex structure.

In the above-mentioned scheme, through setting up the location arch 150 at first surface 120, can effectively fix a position the adaptor 14 for adaptor 14 and electrode terminal 12 weld with the exact gesture, reduce first welding seal 17 and fall recess 1200 in order to take place the risk of rosin joint, thereby can reduce the risk that leads to the inside circuit breaker of battery cell 10 because of the rosin joint leads to adaptor 14 and electrode terminal 12 electrical connection inefficacy, make the battery have higher reliability.

According to some embodiments of the present application, referring to fig. 4-7, along the thickness direction z of the first wall, the positioning portion 15 does not overlap the groove 1200.

Referring to fig. 4-7, the positioning portion 15 may be disposed around the recess 1200, for example, the positioning portion 15 may be disposed on the burring 121 and around the first surface 120.

In the above-mentioned scheme, through setting the location portion 15 to be non-overlapping with the recess 1200, that is, the location portion 15 is set up outside the recess 1200, can effectively fix a position the adapter 14 for adapter 14 and electrode terminal 12 weld with the exact gesture, reduce the risk that first welding mark 17 falls to recess 1200 in order to take place the rosin joint, thereby can reduce the risk that leads to the inside circuit breaker of battery cell 10 because of rosin joint leads to adapter 14 and electrode terminal 12 electrical connection inefficacy, make the battery have higher reliability.

According to some embodiments of the present application, referring to fig. 8 and 9, the positioning portion 15 includes a groove 1200, and a protrusion 143 is formed on a side of the adapter 14 facing the electrode terminal 12, and the protrusion 143 is in positioning engagement with the groove 1200.

The "positioning portion 15 includes the recess 1200" it is understood that the recess 1200 may be used to position the adapter 14. When the groove 1200 is used to position the adaptor 14, a side of the adaptor 14 facing the electrode terminal 12 is correspondingly formed with a protrusion 143, and the protrusion 143 may be positioned in the groove 1200.

In some embodiments, the protrusions 143 may be bumps provided on the surface of the adapter 14. In other embodiments, the protrusion 143 may be a part protruding from the side of the adapter 14 facing away from the electrode terminal 12 by punching to protrude at the side of the adapter 14 facing the electrode terminal 12.

In the above-mentioned scheme, by limiting the positioning portion 15 to include the groove 1200, so that the groove 1200 can be reasonably utilized, so that the adaptor 14 and the electrode terminal 12 are mutually positioned and matched through the concave-convex structure, the positioning precision between the adaptor 14 and the electrode terminal 12 can be effectively improved, the interference of the groove 1200 to the first solder mark 17 is reduced, and the risk of failure in electrical connection between the adaptor 14 and the electrode terminal 12 due to cold welding is effectively reduced, so that the battery has higher reliability.

Referring to fig. 8-10, fig. 10 is a schematic diagram illustrating a partial structure of a battery cell 10 according to some embodiments of the present application.

The adapter 14 is formed with a recess 144 at a side facing away from the electrode terminal 12, the recess 144 being disposed corresponding to the protrusion 143.

The recess 144 is a recess formed in the surface of the adapter 14 facing away from the electrode terminal 12.

In the above-mentioned scheme, by forming the recess 144 at the side of the adapter 14 facing away from the electrode terminal 12, the quality of the adapter 14 can be effectively reduced, and the quality energy density of the battery can be improved.

According to some embodiments of the present application, referring to fig. 9, the electrode terminal 12 includes a first terminal part 122 and a second terminal part 123 which are separately provided, the first terminal part 122 and the second terminal part 123 are aligned and connected in a thickness direction z of the first wall, at least part of the first terminal part 122 is located at a side of the first wall 110 facing the electrode assembly 13, at least part of the second terminal part 123 is located at a side of the first wall 110 facing away from the electrode assembly 13, and the first terminal part 122 and the second terminal part 123 are configured to cooperatively clamp the first wall 110 to restrict the electrode terminal 12 from being separated from the first wall 110 in the thickness direction z of the first wall.

The "electrode terminal 12 includes the first terminal part 122 and the second terminal part 123 which are provided separately" is understood that the electrode terminal 12 includes two mutually independent parts, one of which is the first terminal part 122 and the other of which is the second terminal part 123, and the first terminal part 122 and the second terminal may be mutually independent and not connected before the electrode terminal 12 is assembled to the first wall 110. When the electrode terminal 12 is assembled to the first wall 110, the first and second terminal portions 122 and 123 are disposed corresponding to the mounting hole 1100 of the first wall 110 and stacked in the thickness direction z of the first wall, for example, at least one of the first and second terminal portions 122 and 123 protrudes into the mounting hole 1100 so that the first and second terminal portions 122 and 123 can be connected to each other, and the first and second terminal portions 122 and 123 are pressed against the outer and inner sides of the first wall 110, respectively.

For example, referring to fig. 9, a portion of the first terminal portion 122 is located on the inner side of the first wall 110, the inner side of the first terminal portion 122 located on the first wall 110 can be pressed against the inner side surface of the first wall 110, and another portion of the first terminal portion 122 is located in the mounting hole 1100. The second terminal portion 123 is partially located outside the first wall 110, and the portion located outside the first wall 110 can be pressed against the outer side surface of the first wall 110, and the other end of the second terminal portion 123 is located in the mounting hole 1100.

In other embodiments, the first terminal portion 122 may be plate-shaped, with both of its opposite surfaces in the thickness direction z of the first wall being flat surfaces. A portion of the second terminal portion 123 may be pressed against the outer side surface of the first wall 110, and another portion of the second terminal portion 123 may be positioned in the mounting hole 1100 and may be connected to the first terminal portion 122.

The connection relationship between the first terminal portion 122 and the second terminal portion 123 includes, but is not limited to, welding, bonding, clamping, riveting, screw connection, or the like. In some embodiments, the first terminal portion 122 and the second terminal portion 123 may be soldered to each other and form a second solder print. In some embodiments, the second solder print and the first solder print 17 may not overlap. Illustratively, a portion of the first terminal portion 122 located within the mounting hole 1100 may be welded with a portion of the second terminal portion 123 located within the mounting hole 1100 and form a second weld.

Currently, the electrode terminal 12 may be assembled to the first wall 110 through a caulking process, for example, during caulking, a caulking plug may abut against an end surface of the electrode terminal 12 away from the electrode assembly 13 from an outer side surface of the first wall 110 toward an inner side surface, so as to be able to form a burring portion 121 pressed against the outer side surface of the first wall 110. However, since the area of the burring 121 is small due to the caulking process, the connection strength between the electrode terminal 12 and the first wall 110 is weak, and the electrode terminal 12 is easily separated from the first wall 110, affecting the reliability of the battery.

For this reason, in the above-described scheme, the electrode terminal 12 is provided to include the first terminal part 122 and the second terminal part 123 which are separately provided and connected to each other, so that the electrode terminal 12 can be designed as a member having a large area and capable of being pressed against the first wall 110, to improve the connection strength of the electrode terminal 12 and the first wall 110, to reduce the risk of the electrode terminal 12 being separated from the first wall 110, and to allow the battery to have high reliability.

According to some embodiments of the present application, the projection of the first terminal portion 122 and the projection of the second terminal portion 123 do not overlap along the second direction y, which is any direction perpendicular to the thickness direction z of the first wall.

By "the projection of the first terminal portion 122 and the projection of the second terminal portion 123 do not overlap in the second direction y" is understood that the first terminal portion 122 and the second terminal portion 123 are arranged in a stacked manner in the thickness direction z of the first wall, and the contact surface therebetween may be a flat surface such that the projection of the first terminal portion 122 and the projection of the second terminal portion 123 do not overlap in any direction perpendicular to the thickness direction z of the first wall.

In the above-described aspect, the projection of the first terminal portion 122 and the projection of the second terminal portion 123 are set so as not to overlap, so that the difficulty in assembling the first terminal portion 122 and the second terminal portion 123 on the first wall 110 can be reduced, the manufacturing efficiency of the battery cell can be improved, and the manufacturing efficiency of the battery can be further improved.

According to some embodiments of the present application, the first terminal portion 122 is provided with a positioning portion 15.

Referring to fig. 9, in some embodiments, the positioning portion 15 may be disposed on a surface of the first terminal portion 122 facing away from the first wall 110. The positioning portion 15 may include a groove 1200 provided on the first terminal portion 122. In other embodiments, the positioning portion 15 may further include a positioning protrusion 150 disposed on the first terminal portion 122.

In some embodiments, to facilitate assembly between the first terminal portion 122 and the second terminal portion 123, the second terminal portion 123 may be formed with a locating flange protruding into the mounting hole 1100 of the first wall 110. Based on this embodiment, the second terminal portion 123 may be formed with a recessed region corresponding to the position of the positioning flange, which may be used for positioning as the groove 1200.

In the above-mentioned scheme, through setting up location portion 15 at first terminal portion 122, can make adapter 14 and electrode terminal 12 weld with the exact gesture to reduce the risk that leads to the inside circuit breaker of battery cell because of the rosin joint leads to adapter 14 and electrode terminal 12 electrical connection inefficacy, make the battery have higher reliability.

Some embodiments of the present application also provide a battery comprising the battery cell 10 provided above.

Some embodiments of the present application also provide an electrical device comprising the battery cell 10 provided above. The battery cell 10 is used to provide electrical energy.

The present application also provides a battery cell 10, please refer to fig. 3-10. The battery cell 10 includes a case 11, an electrode assembly 13, an electrode terminal 12, and an adapter 14. The housing 11 has a first wall 110. The electrode terminal 12 is mounted to the first wall 110. The electrode assembly 13 is disposed inside the case 11. The adapter 14 connects the electrode terminal 12 and the electrode assembly 13. Wherein the electrode terminal 12 is provided with a positioning portion 15 for positioning the adapter 14. The electrode terminal 12 has a first surface 120 facing the motor assembly, and the positioning portion 15 may be disposed on the first surface 120, and the first surface 120 is formed with a groove 1200. The electrode terminal 12 and the adapter 14 are welded and connected and form a first weld 17.

In some embodiments, referring to fig. 4, the positioning portion 15 includes a positioning protrusion 150 disposed on the first surface 120, and correspondingly, the adapter 14 is provided with a positioning groove 160. Through the cooperation of the positioning protrusion 150 and the positioning groove 160 to position the adapter 14, the risk of overlapping the first welding mark 17 and the groove 1200 can be reduced during welding, so that the electrical connection relationship between the electrode terminal 12 and the adapter 14 is stable, and further, the reliability of the battery cell 10 is high.

In some embodiments, referring to fig. 5-7, the positioning portion 15 includes a positioning protrusion 150 disposed on the first surface 120. The positioning protrusion 150 protrudes from the first surface 120, and the positioning protrusion 150 and the first surface 120 together define a positioning space 151. The terminal connection part 140 of the adapter 14 is positioned in the positioning space 151, which can reduce the risk of overlapping the first welding marks 17 with the grooves 1200 when welding, so that the electrical connection relationship between the electrode terminal 12 and the adapter 14 is stable, and thus, the reliability of the battery cell 10 is high.

In some embodiments, referring to fig. 8 to 10, the positioning part 15 includes a groove 1200, and a side of the adapter 14 facing the electrode terminal 12 is formed with a protrusion 143, and the protrusion 143 is in positioning engagement with the groove 1200. By the positioning fit of the groove 1200 and the protrusion 143, the risk of overlapping of the first welding mark 17 and the groove 1200 can be reduced at the time of welding, so that the electrical connection relationship between the electrode terminal 12 and the adapter 14 is stable, and further, the reliability of the battery cell 10 is high.

In some embodiments, the electrode terminal 12 includes a first terminal part 122 and a second terminal part 123 that are separately provided, the first terminal part 122 and the second terminal part 123 being aligned and connected in a thickness direction z of the first wall, at least a portion of the first terminal part 122 being located at a side of the first wall 110 facing the electrode assembly 13, and at least a portion of the second terminal part 123 being located at a side of the first wall 110 facing away from the electrode assembly 13, the first terminal part 122 and the second terminal part 123 being configured to cooperatively sandwich the first wall 110 to restrict the electrode terminal 12 from being separated from the first wall 110 in the thickness direction z of the first wall. The positioning portion 15 may be disposed on the first terminal portion 122.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing having a first wall;

an electrode terminal mounted to the first wall;

an electrode assembly disposed inside the case;

an adapter located inside the first wall, the adapter connecting the electrode terminal and the electrode assembly;

wherein the electrode terminal is provided with a positioning portion for positioning the adapter.

2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the adapter is provided with a positioning matching part, and the positioning matching part is matched with the positioning part.

3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells,

one of the positioning portion and the positioning mating portion includes a positioning groove, and the other includes a positioning protrusion.

4. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells,

The number of the positioning parts and the number of the positioning matching parts are multiple, the positioning parts are arranged at intervals, and the positioning matching parts and the positioning parts are in one-to-one correspondence.

5. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the electrode terminal has a first surface facing the electrode assembly in a thickness direction of the first wall;

the positioning part comprises a positioning protrusion protruding from the first surface, the positioning protrusion and the first surface together define a positioning space, the adapter comprises a terminal connecting part connected with the electrode terminal, and the terminal connecting part is positioned in the positioning space.

6. The battery cell of claim 5, wherein the battery cell comprises a plurality of cells,

along the circumference of first surface, the location arch encloses to be located the edge of first surface, the location arch is formed with the breach, the breach is used for dodging the adaptor.

7. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells,

the positioning protrusion extends along the circumferential direction of the first surface and surrounds the edge part of the first surface; and two ends of the positioning protrusion are arranged at intervals along the circumferential direction of the first surface, and the notch is formed.

8. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells,

the positioning protrusions comprise a plurality of sub positioning protrusions, the plurality of sub positioning protrusions are arranged at intervals along the circumferential direction of the first surface, and gaps are formed between two of the plurality of sub positioning protrusions.

9. The battery cell of claim 5, wherein the battery cell comprises a plurality of cells,

the adapter further comprises a tab connection part for being connected with a tab of the electrode assembly, wherein the terminal connection part is connected with the tab connection part, and the width of the tab connection part is larger than that of the terminal connection part.

10. The battery cell according to any one of claims 1-9, wherein,

the electrode terminal has a first surface facing the electrode assembly in a thickness direction of the first wall, the first surface being formed with a groove;

the adapter piece and the electrode terminal are welded to form a first welding mark, and the first welding mark is not overlapped with the groove along the thickness direction of the first wall.

11. The battery cell of claim 10, wherein the battery cell comprises a plurality of cells,

the first welding marks are arranged around the grooves.

12. The battery cell of claim 10, wherein the battery cell comprises a plurality of cells,

A flanging part is arranged at one end of the electrode terminal, facing the electrode assembly, along the thickness direction of the first wall, the flanging part is pressed on the inner side surface of the first wall, and the flanging part is arranged around the groove;

the adapter piece and the flanging part are welded to form the first welding mark.

13. The battery cell of claim 12, wherein the battery cell comprises a plurality of cells,

the electrode terminal includes a first terminal portion and a second terminal portion that are disposed separately and connected to each other, the burring portion and the groove are disposed in the first terminal portion, and the first terminal portion and the second terminal portion are configured to cooperatively clamp the first wall so as to restrict the electrode terminal from being separated from the first wall in a thickness direction of the first wall.

14. The battery cell of claim 10, wherein the battery cell comprises a plurality of cells,

the positioning part comprises a positioning protrusion protruding from the first surface.

15. The battery cell of claim 10, wherein the battery cell comprises a plurality of cells,

the positioning portion does not overlap with the groove in the thickness direction of the first wall.

16. The battery cell of claim 10, wherein the battery cell comprises a plurality of cells,

the positioning part comprises the groove, a convex part is formed on one side of the adapter facing the electrode terminal, and the convex part is matched with the groove in a positioning way.

17. The battery cell of claim 16, wherein the battery cell comprises a plurality of cells,

a concave part is formed on one side of the adapter, which is away from the electrode terminal, and the concave part is arranged corresponding to the convex part.

18. The battery cell according to any one of claims 1-9, wherein,

the electrode terminal includes a first terminal portion and a second terminal portion that are separately provided, the first terminal portion and the second terminal portion are arranged and connected in a thickness direction of the first wall, at least a portion of the first terminal portion is located at a side of the first wall facing the electrode assembly, at least a portion of the second terminal portion is located at a side of the first wall facing away from the electrode assembly, and the first terminal portion and the second terminal portion are configured to cooperatively clamp the first wall so as to restrict the electrode terminal from being separated from the first wall in the thickness direction of the first wall.

19. The battery cell of claim 18, wherein the battery cell comprises a plurality of cells,

the projection of the first terminal portion and the projection of the second terminal portion do not overlap in a second direction, which is an arbitrary direction perpendicular to the thickness direction of the first wall.

20. The battery cell of claim 18, wherein the battery cell comprises a plurality of cells,

the first terminal portion is provided with the positioning portion.

21. A battery comprising the battery cell of any one of claims 1-20.

22. An electrical device comprising a cell according to any one of claims 1 to 20 for providing electrical energy.