CN220306459U - Battery monomer, battery, power utilization device and tool - Google Patents

Abstract

The application discloses battery monomer, battery, power consumption device and frock, battery monomer includes the casing, electrode assembly, apron subassembly and adapter piece, electrode assembly sets up in the casing, including the positive plate, the negative plate, the diaphragm and by the outside utmost point ear that extends formation of positive plate or negative plate, the apron subassembly includes the apron body and sets up in the electrode terminal of apron body, the apron body is connected with the casing cooperation, the adapter piece includes terminal connection portion and utmost point ear guiding portion, terminal connection portion is connected with electrode terminal, utmost point ear guiding portion is connected with the utmost point ear, the one side that the utmost point ear guiding portion is close to electrode assembly is the internal surface, the partial surface indent of internal surface forms the recess. According to the technical scheme, the grooves are formed in the inner surfaces of the lug guide parts, so that the strength of the lug guide parts is enhanced, the assembly space is reserved, the space utilization rate of the battery cells is improved, and the energy density of the battery cells is improved.

Description

Battery monomer, battery, power utilization device and tool

Technical Field

The application relates to the field of batteries, in particular to a battery monomer, a battery, an electricity utilization device and a tool.

Background

The battery cell is widely used in electric devices, such as vehicles, energy storage cabinets and the like, and at present, how to improve the energy density of the battery cell on the premise of limited space is one research direction of battery technology.

Disclosure of Invention

In view of the above, the application provides a battery monomer, a battery, an electricity utilization device and a tool, which can solve the problem of improving the energy density of the battery monomer under the premise of limited space.

In a first aspect, the present application provides a battery cell comprising:

a housing;

the electrode assembly is arranged in the shell and comprises a positive plate, a negative plate, a diaphragm and a tab formed by outwards extending the positive plate or the negative plate;

the cover plate assembly comprises a cover plate body and an electrode terminal arranged on the cover plate body, and the cover plate body is connected with the shell in a matched manner;

the switching piece comprises a terminal connecting part and a tab guiding part, wherein the terminal connecting part is connected with an electrode terminal, the tab guiding part is connected with a tab, one surface of the tab guiding part, which is close to the electrode assembly, is an inner surface, and part of the surface of the inner surface is concave inwards to form a groove.

According to the technical scheme, the grooves are formed in the inner surfaces of the lug guide parts, so that the strength of the lug guide parts is enhanced, and the assembly space is reserved, so that the minimum distance from the lug guide parts to the end parts of the electrode assemblies is reduced, the space utilization rate of the battery cells is improved, and the energy density of the battery cells is improved.

In some embodiments, the terminal connection portion and the tab guide portion are not on the same plane, and are disposed at a certain angle, so that welding between the tab guide portion and the tab of the battery cell, which is not disposed in the tab extraction direction, of the cover plate assembly can be facilitated.

In some embodiments, the grooves extend along the height direction of the battery cells or the axial direction of the tab bending, and extend to the ends of the tab guide parts. Therefore, the manufacturing difficulty of the switching piece can be reduced, and the installation of the tooling at the welding process stage of the tab and the switching piece can be facilitated.

In some embodiments, the tab guide portion has an outer surface on a side thereof remote from the electrode assembly, the outer surface being planar, and the tab is welded to the outer surface.

In the technical scheme, the welding area of the tab and the switching piece can be increased, the overcurrent area of the electrode assembly when the electrode assembly is electrically connected with the electrode terminal through the switching piece is increased, and the possibility of heat accumulation is reduced. Meanwhile, the electrode lug and the electrode lug guide part are welded away from the outer surface of the electrode assembly, so that the welding operation is simpler, and the welding difficulty is reduced; on the other hand, the space between the tab guide part and the electrode assembly occupied by the tab can be reduced, so that the structure of the battery cell is more compact.

In some embodiments, at least two tabs are respectively bent from two sides of the tab guide portion to the outer surface. The tabs are bent from the two sides of the tab guide part, compared with the tabs which are bent from one side of the tab guide part, the tab bending thickness is reduced, and adverse effects on the battery cells caused by too thick tab bending parts are reduced.

In some embodiments, the tab guide is provided with a slit, and a projection of the tip of at least one tab in the thickness direction of the tab guide at least partially overlaps the slit. The lug guide part is provided with the slotting to provide a positioning structure or a limiting structure for the corresponding tool, meanwhile, the slotting area is a non-welding area of the lug and the switching piece, and can be used for placing one or more lug ends, the tail ends of the lugs after being bent are not required to be equal in length, the lug end cutting procedure can be reduced, and the manufacturing cost of the battery cell is reduced.

In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment. The battery can adjust the overall capacitance by adjusting the number of the battery cells so as to adapt to the power utilization devices with different requirements.

In a third aspect, the present application provides an electrical device, which includes a battery cell or a battery in the foregoing embodiment, where the battery cell or the battery is used to provide electrical energy.

In a fourth aspect, the application provides a frock, including connecting portion and at least one frock body, wherein, the frock body is the angle setting with the connecting portion, and in the direction that the frock body extends, the middle part thickness of frock body is greater than marginal thickness, is favorable to reducing the design space requirement of frock between change piece and the electrode assembly at the frock use. The frock body sets up the strengthening rib in the direction that connecting portion extended, further is favorable to guaranteeing on the intensity that reduces the basis of frock body thickness. The protruding portion is arranged on the tool body in the extending direction of the connecting portion, so that the tool body is beneficial to being matched with the slotting of the battery single-body switching piece in the using process of the tool, and the tool can be well positioned or limited.

In some embodiments, the reinforcing ribs are wedge-shaped, which is further beneficial to the strength assurance of the tool.

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 specific embodiments of the present application are specifically listed below.

In addition, the above embodiments may be arbitrarily combined on the basis of common general knowledge in the art.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic view illustrating an exploded structure of a battery cell according to some embodiments of the present application;

FIG. 2 is a schematic view of the switch plate of FIG. 1;

fig. 3 is a schematic structural diagram of a tooling according to some embodiments of the present application;

FIG. 4 is a schematic view of the structure of the tool body in FIG. 3;

fig. 5 is a schematic diagram illustrating the cooperation between a battery monomer and a tooling structure according to some embodiments of the present application;

fig. 6 is a schematic diagram illustrating the cooperation between a battery cell and a tooling structure according to other embodiments of the present application.

Fig. 7 is an enlarged view of a portion of the battery cell of fig. 6 mated with a tooling structure.

Reference numerals illustrate:

battery cell 10

Shell 1

Electrode assembly 2

Tab 21

Cover plate assembly 3

Cover plate body 31

Electrode terminal 32

Transfer sheet 4

Terminal connection portion 41

Tab guide 42

Groove 421

Slotting 422

Tool 20

Tool body 5

Reinforcing rib 51

Projection 52

Connection part 6

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 cells may include lithium ion secondary battery cells, lithium ion primary battery cells, lithium sulfur battery cells, sodium lithium ion battery cells, sodium ion battery cells, or magnesium ion battery cells, and the embodiment of the present application is not limited thereto. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. A battery generally includes a housing for enclosing one or more battery cells. The housing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode unit including at least one electrode assembly including a positive electrode tab, a negative electrode tab, and a separator, and an electrolyte. 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, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive current collector comprises a positive current collecting part and a positive protruding part protruding out of the positive current collecting part, the positive current collecting part is coated with a positive active material layer, at least part of the positive protruding part is not coated with the positive active material layer, and the positive protruding part is used as a positive lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, 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, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative current collector comprises a negative current collecting part and a negative convex part protruding out of the negative current collecting part, wherein the negative current collecting part is coated with a negative active material layer, at least part of the negative convex part is not coated with the negative active material layer, and the negative convex part is used as a negative tab. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The technical scheme described in the embodiment of the application is applicable to batteries and electric devices using battery cells or batteries. The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.

From the background art, it is an urgent need for those skilled in the art to improve the energy density of a battery. The applicant analysis considers that for the battery cells with tabs coming out from both sides of the positive electrode tab or the negative electrode tab, in order to weld the tabs with the tabs, a tooling is required between the electrode assembly and the tabs. When the welding is completed, the tooling is removed. During welding, space occupied by the tool is wasted, and therefore energy density is affected. Through the space that the frock occupy when reducing the welding, and then can increase electrode assembly volume to increase energy density. One way to reduce the space occupied by the tooling is to thin the tooling, but this can affect the tooling strength and thus the welding quality. The inventor has further studied to provide a battery cell structure and a tool adapted to the provided battery cell structure in the present application.

As shown in fig. 1, the battery cell 10 of the embodiment of the present application includes a case 1, an electrode assembly 2, a cap plate assembly 3, and a tab 4. The case 1 may be made of metal, and preferably aluminum. The case 1 is provided with an opening for placing the electrode assembly 2. The electrode assembly 2 is disposed in the case 1 and includes a positive electrode tab, a negative electrode tab, a separator, and a tab 21 formed by extending the positive electrode tab or the negative electrode tab outward. The tab 21 is used for electrical connection of the battery cell 10. The cap assembly 3 includes a cap body 31 and electrode terminals 32 disposed at the cap body 31. The cover body 31 may be made of metal, preferably aluminum. The cover body 31 is disposed at the opening of the housing 1 and is cooperatively connected with the housing 1 to form a hexahedral structure with a hollow cavity. The hollow cavity is a closed cavity into which electrolyte can be poured. The good sealing of the cavity is beneficial to preventing the electrolyte from flowing out. The cover body 31 and the housing 1 may be made of the same metal material. Alternatively, the cover body 31 and the housing 1 may be made of the same metal material with different strength. The cover plate body 31 has a strength higher than that of the case 1, which is advantageous in maintaining the strength of the whole battery cell 10 and avoiding the problem of sealing failure. The cap body 31 is provided with terminal holes penetrating in the thickness direction of the cap body 31. The electrode terminal 32 is disposed in cooperation with the terminal hole and penetrates the terminal hole. The electrode terminals 32 are used for electrical connection inside and outside the battery cell 10. Wherein, the thickness direction of the cover plate body 31 is identical to the height direction of the battery cell 10, i.e., the Z direction.

The inventors have found that the cover plate assembly is generally disposed at one end of the tab extraction direction, and if the cover plate assembly is not disposed in the tab extraction direction, it is difficult for the flat plate-shaped adapter to electrically connect the tab with the electrode terminal.

Fig. 2 is a schematic view of the structure of the transfer tab 4 in fig. 1. As shown in fig. 2, the adapter tab 4 of the battery cell 10 according to the embodiment of the present application includes a terminal connection portion 41 and a tab guiding portion 42, where the terminal connection portion 41 and the tab guiding portion 42 are not on the same plane, and are disposed at a certain angle, such as 90 degrees or other angles. The tab guide 42 may be formed to be bent on the basis of being coplanar with the terminal connection portion 41. The terminal connection portion 41 is for electrically connecting with the electrode terminal 32, and the tab guide portion 42 is for electrically connecting with the tab 21. In this way, welding of the tab guide portion 42 of the battery cell 10, which is not provided in the lead-out direction of the tab 21 by the cap plate assembly 3, to the tab 21 can be facilitated.

In the embodiment of the present application, the tab guide 42 has an inner surface on a side close to the electrode assembly 2, and a portion of the inner surface is concave inward to form a groove 421. The groove 421 may be provided at a middle region or other regions of the tab guide 42. The grooves 421 extend along the height direction of the battery cell 10 or the axial direction in which the tabs 21 are bent. The groove 421 is formed on the tab guide 42 using a stamping process, so that work hardening for the region of the groove 421 can improve the strength of the material body. In this way, the strength of the tab guide 42 can be further enhanced. Meanwhile, the arrangement of the grooves 421 can reduce the space occupied by the tab guide parts 42, so that the space matched with the tool 20 is reserved, the distance reserved between the tab guide parts 42 and the end parts of the electrode assemblies 2 for the tool 20 can be further shortened, the necessary minimum distance from the tab guide parts 42 to the end parts of the electrode assemblies 2 is reduced, the space utilization rate of the battery cells 10 is improved, and the energy density of the battery cells 10 is further improved. The end of the electrode assembly 2 refers to the end connected to the tab 21. As shown in fig. 2, the groove 421 may extend to the end of the tab guide 42. The distal end of the tab guide 42 refers to the distal end of the free end of the tab guide 42. Therefore, the manufacturing difficulty of the switching piece 4 can be reduced, and the installation of the tooling 20 in the welding process stage of the tab 21 and the switching piece 4 can be facilitated.

In some embodiments, the tab 4 is further provided with a slit 422, and as shown in fig. 2, the slit 422 is provided in a middle region of the tab guide 42, and may be provided on the basis of the groove 421. The slit 422 penetrates the tab guide portion 42 in the thickness direction, and as shown in fig. 2, the thickness direction of the tab guide portion 42 is the X direction.

The inventor finds that under the general condition, when the switching piece is in a flat plate structure and the plurality of lugs are bent and welded with the switching piece, the free ends of the plurality of lugs are uneven, and if the welding area or the welding yield of the lugs and the switching piece is ensured, the free ends of the plurality of lugs need to be cut, so that a lug cutting procedure is required to be arranged in the manufacturing process.

In the embodiment of the present application, the tab guide portion 42 is provided with the slit 422, so that the projection of the tip end of the tab 21, i.e., the free end of the tab 21, in the thickness direction of the tab guide portion 42 at least partially overlaps the slit 422. In other words, the slit 422 area can be used for placing one or more terminal ends of the tab 21, and the slit 422 area is a non-welding area between the tab 21 and the adapter piece 4, so that the cutting procedure of the tab 21 can be reduced, and the manufacturing cost of the battery cell 10 can be reduced. In addition, the tab guiding portion 42 is provided with a slit 422, which can also provide a positioning structure or a limiting structure for the tool 20.

Fig. 3 to 4 are schematic structural views of the tool 20 according to the present application. As shown in fig. 3, the tool 20 disclosed in the embodiment of the present application includes a tool body 5 and a connection portion 6. The tool body 5 may be one or more, and if the tool body 5 is plural, it is necessary to connect each other through the connection portion 6. To facilitate the use of the tool 20, the tool body 5 and the connecting portion 6 are generally disposed at an angle, such as 90 degrees. In this way, the fixture 20 can be installed from the bottom of the electrode assembly 2 along the reverse direction of the electrode assembly 2 installed in the casing 1 for supporting the tab 21 and the adapter plate 4 in the welding process.

In the embodiment of the present application, in order to fully utilize the space formed by assembling the tab 21, the adapter piece 4 and the electrode assembly 2 under the condition of minimizing the gap formed by the tab 21, the adapter piece 4 and the electrode assembly 2, the strength of the tool body 5 is ensured, and the tool body 5 as shown in fig. 4 is provided. In the direction in which the tooling body 5 extends, the middle thickness of the tooling body 5 is greater than the edge thickness, and the tooling body 5 is provided with a reinforcing rib 51 and a protruding portion 52 in the direction in which the connecting portion 6 extends.

During the use of the tooling 20, the tooling body 5 protrudes toward the electrode assembly 2, and in the thickness direction (i.e., Y direction) of the electrode assembly 2, the middle thickness of the tooling body 5 is greater than the edge thickness. On the side facing away from the electrode assembly 2, a protrusion 52 is provided on the tool body 5, the protrusion 52 being located in the middle region of the tool body 5. Here, the middle region of the tool body 5 refers to the middle region of the tool body 5 in the thickness direction of the electrode assembly 2. The protruding portion 52 extends in a direction away from the electrode assembly 2, and may have a length greater than or equal to or less than the thickness of the middle portion of the tool body 5, but preferably exceeds the thickness of the switching piece 4. The protruding part 52 can be inserted into the slit 422 of the switching piece 4 to fix or limit the tool body 5. The reinforcing rib 51 is also disposed at one side of the tool body 5 facing away from the electrode assembly 2, and may be located at both sides of the protrusion 52 in the thickness direction of the electrode assembly 2. The protruding part 52 is wedge-shaped, can be matched with the groove 421 of the adapter piece 4, and is favorable for increasing the strength of the tool body 5. On the other hand, the arrangement of the tooling body 5 can prevent adverse effects on the electrode assembly 2 caused by welding in the welding process of the tab 21 and the tab guide part 42 of the switching piece 4. For example, when the tab 21 and the adapter plate 4 are welded by laser, the tool body 5 can block the adverse effect of the laser beam on the electrode assembly 2.

Fig. 5 to 7 are schematic views illustrating the cooperation between the battery cell 10 and the tooling structure according to some embodiments of the present application. The tool body 5 of the tool 20 is at least partially located between the switching piece 4 and the electrode assembly 2, and at least two tabs 21 are bent from different sides of the tab guiding portion 42 of the switching piece 4 and are disposed on the outer surface of the tab guiding portion 42. The outer surface of the tab guide 42 refers to the surface on which the electrode assembly 2 is located. In this way, the welding area between the tab 21 and the tab 4 can be increased, and the welding area between the tab 21 and the tab 4 can be increased, thereby increasing the overcurrent area when the electrode assembly 2 is electrically connected to the electrode terminal 32 via the tab 4, and reducing the possibility of heat accumulation. Meanwhile, the tab 21 and the tab guide part 42 are far away from the outer surface of the electrode assembly 2 for welding, so that the welding operation is simpler, and the welding difficulty can be reduced. On the other hand, the space between the tab guide 42 and the electrode assembly 2 occupied by the tab 21 can be reduced, so that the structure of the battery cell 10 is more compact. As shown in fig. 5 to 6, in some embodiments, at least two tabs 21 are respectively bent from both side edges of the tab guide portion 42 to the outer surface. The tabs 21 are bent from the two sides of the tab guide portion 42, which is advantageous for reducing the bending thickness of the tabs 21 compared with the bending of the tabs 21 from one side of the tab guide portion 42, and further reducing the adverse effect on the battery cell 10 caused by the excessive thickness of the bending position of the tabs 21. The protruding part 52 of the tooling body 5 passes through the slit 422 of the tab guiding part 42 of the switching piece 4 and penetrates out of the outer surface of the tab guiding part 42.

Another embodiment of the present application discloses a battery (not shown), and the technical solutions described in the foregoing embodiments are all applicable, where the battery unit 10 may be one or multiple. If there are a plurality of battery cells 10, the plurality of battery cells 10 may be connected in series, parallel or series-parallel. Series-parallel connection refers to the presence of both series and parallel connection of the plurality of battery cells 10. The plurality of battery cells 10 can be connected in series or in parallel or in series-parallel, and then are integrally arranged in a battery box, or the plurality of battery cells 10 are connected in series or in parallel or in series-parallel to directly form a battery module and then are arranged in the battery box. The battery can adjust the overall capacitance by adjusting the number of the battery cells 10 so as to adapt to different electric devices with different requirements.

Yet another embodiment of the present application discloses an electric device to which the battery cell 10 or the battery (not shown) in the foregoing respective embodiments is applied.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications may be made to the technical solutions described in the foregoing embodiments or equivalents may be substituted for some of the technical features thereof, and these modifications or substitutions do not depart from the spirit and scope of the technical solutions of the respective embodiments of the present application. Various changes and modifications may be made to these embodiments by those skilled in the art without departing from the principles and spirit of the technical solutions of the present application, but these changes and modifications fall within the scope of the present application.

Claims (10)

1. A battery cell, comprising:

a housing;

an electrode assembly disposed within the housing;

the cover plate assembly comprises a cover plate body and an electrode terminal arranged on the cover plate body, and the cover plate body is connected with the shell in a matched manner;

the electrode assembly comprises an electrode assembly, and is characterized by comprising a switching piece, wherein the switching piece comprises a terminal connecting part and a tab guiding part, the terminal connecting part is connected with the electrode terminal, the tab guiding part is connected with a tab of the electrode assembly, one surface, close to the electrode assembly, of the tab guiding part is an inner surface, and part of the surface of the inner surface is concave inwards to form a groove.

2. The battery cell of claim 1, wherein the terminal connection portion and the tab guide portion are not in the same plane, and are disposed at an angle.

3. The battery cell of claim 1, wherein the groove extends along a height direction of the battery cell or an axial direction of the tab bend and extends to a tip of the tab guide portion.

4. The battery cell of claim 1, wherein a side of the tab guide away from the electrode assembly is an outer surface, the outer surface is a plane, and the tab is welded to the outer surface.

5. The battery cell of claim 4, wherein at least two of the tabs are respectively bent from both sides of the tab guide portion to the outer surface.

6. The battery cell according to claim 5, wherein the tab guide portion is provided with a slit, and a projection of a tip of at least one of the tabs in a thickness direction of the tab guide portion at least partially overlaps the slit.

7. A battery comprising a battery cell according to any one of claims 1-6.

8. An electrical device comprising a battery cell according to any one of claims 1-6 or a battery according to claim 7.

9. A tooling for welding the adapter plate and the tab of the battery cell according to any one of claims 1-6, comprising a connecting portion and at least one tooling body, wherein the tooling body is arranged at an angle to the connecting portion, and in the extending direction of the tooling body, the thickness of the middle part of the tooling body is greater than the thickness of the edge, and the tooling body is provided with a reinforcing rib and a protruding portion in the extending direction of the connecting portion.

10. The tooling of claim 9, wherein the reinforcing bars are wedge-shaped.