CN223206286U - Battery cell, battery device and electricity utilization device - Google Patents

Abstract

The application provides a battery cell, a battery device and an electric device, the battery cell includes a case, an electrode assembly, an electrode terminal, and a switching tab. The housing has a receiving cavity. The electrode assembly is accommodated in the accommodating chamber, and the electrode assembly includes a body portion and a tab connected to each other. The electrode terminal is disposed at one side of the case and located at the electrode assembly in the first direction. The switching piece holds in holding the chamber, and the switching piece is connected with utmost point ear and electrode terminal respectively. The switching piece part is arranged between the tab and the main body part along the first direction. The embodiment of the application is beneficial to improving the energy density of the battery monomer.

Description

Battery cell, battery device and electricity utilization device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery cell, a battery device, and an electric device.

Background

Battery cells are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. The battery cells may include cadmium-nickel battery cells, hydrogen-nickel battery cells, ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.

In the development of battery technology, how to increase the energy density of a battery cell is a technical problem that needs to be solved in battery technology.

Disclosure of utility model

In view of the above, the present application provides a battery cell, a battery device and an electric device, which are beneficial to improving the energy density of the battery cell.

The application provides a battery cell, which comprises a shell, an electrode assembly, an electrode terminal, a switching piece and a switching piece, wherein the shell is provided with a containing cavity, the electrode assembly is contained in the containing cavity and comprises a main body part and a tab which are connected with each other, the electrode terminal is arranged on one side of the shell along a first direction of the electrode assembly, the switching piece is contained in the containing cavity and is respectively connected with the tab and the electrode terminal, and the switching piece is arranged between the tab and the main body part along the first direction.

In some embodiments of the first aspect, the battery cell includes a housing, an electrode assembly, an electrode terminal, and a switching piece, where the electrode assembly and the electrode terminal are electrically connected through the switching piece, and a portion of the switching piece is disposed between the tab and the main body portion along a first direction, so that a space occupied by the switching piece after connection with the tab can be reduced, and a space for accommodating the main body portion in the accommodating cavity is increased, so that a size of the main body portion along the first direction can be designed to be larger, and improvement of energy density of the battery cell is facilitated.

In some embodiments, the housing includes a shell having an opening along a first direction and an end cap assembly including a cover plate covering the opening and enclosing with the shell to form a receiving cavity, the electrode terminals being disposed on the cover plate. By the arrangement, the processing and the assembly are convenient.

In some embodiments, the tab is bent and disposed, and the tab is connected to a surface of the adapter plate facing away from the main body along the first direction. Through this mode setting, be convenient for the connection of utmost point ear and change piece.

In some embodiments, the tab includes a first base body and a second base body that are disposed in an intersecting manner, the first base body is connected between the main body portion and the second base body, the first base body, the second base body and the main body portion enclose to form an accommodating space, and the adapter piece portion is located in the accommodating space and connected with the second base body. Through this mode setting, the shaping of the utmost point ear of being convenient for, and do benefit to the occupation space who reduces the utmost point ear.

In some embodiments, the main body, the switching piece and the second substrate are sequentially stacked in the first direction, and the first substrate is attached to the side wall surface of the switching piece. Through this mode setting for the change piece is compacter with the design of utmost point ear, does benefit to the occupation space after its two connection.

In some embodiments, the adapter piece has a notch, and the tab is disposed through the notch and bent, so that the adapter piece is partially located between the tab and the main body along the first direction. Through this mode setting, the assembly of being convenient for, and do benefit to reduce cost.

In some embodiments, the adapter piece includes a terminal connection portion and a tab connection portion, the tab connection portion is disposed on at least one side of the notch along the second direction, the terminal connection portion is disposed on one side of the notch along the third direction, the tab connection portion is connected to the tab, the terminal connection portion is connected to the electrode terminal, and the third direction intersects the first direction and the second direction. Through the arrangement of the mode, the layout is reasonable, and the connection assembly of the switching sheet, the electrode lugs and the electrode terminals is convenient.

In some embodiments, the number of tab connection portions is two or more, the two or more tab connection portions are arranged side by side along the second direction, and a gap is formed between two adjacent tab connection portions. The mode is reasonable in layout and convenient to assemble.

In some embodiments, the number of notches is two or more, and the two or more notches are spaced apart along the second direction. Through this mode setting for a switching piece can be connected with a plurality of tabs, does benefit to the preparation efficiency that improves the switching piece.

In some embodiments, the tab connection and the terminal connection are a unitary structure. By the arrangement, the manufacturing efficiency is improved.

By this arrangement, the thickness of the tab connection portion is the same as the thickness of the terminal connection portion in the first direction. Through the arrangement, the processing and the manufacturing are convenient.

In some embodiments, one side surface of the tab connection portion along the first direction is disposed coplanar with one side surface of the terminal connection portion along the first direction, and the other side surface of the tab connection portion along the first direction is disposed coplanar with the other side surface of the terminal connection portion along the first direction. Through the arrangement, the processing and the manufacturing are convenient.

In some embodiments, the number of electrode assemblies is set to n, n is an even number, the number of notches is n/2, the tabs of each two adjacent electrode assemblies are arranged through the same notch, and the tabs of each two adjacent electrode assemblies are symmetrical and are arranged close to each other. Through the arrangement, the connection area between the switching piece and the tab is increased, so that the overcurrent capacity between the switching piece and the tab is increased.

In some embodiments, the tabs of the same electrode assembly are arranged in pairs, and the notches are arranged toward the tabs arranged in pairs in the arrangement direction of the tabs arranged in pairs. By the arrangement, the assembly of the switching piece and the tab is convenient.

In a second aspect, the present application provides a battery device comprising a plurality of battery cells provided according to any one of the embodiments of the first aspect.

In a third aspect, the present application provides an electrical device comprising a plurality of cells provided in accordance with any of the embodiments of the first aspect, or a battery device provided in accordance with any of the embodiments of the second aspect, the cells or battery devices being for storing or providing electrical energy.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

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

fig. 2 is a schematic view of an explosion structure of a battery according to some embodiments of the present application;

Fig. 3 is a schematic structural diagram of a battery cell assembly according to some embodiments of the present application;

fig. 4 is a schematic perspective view of a battery cell according to some embodiments of the present application;

Fig. 5 is a schematic diagram illustrating an explosion structure of a battery cell according to some embodiments of the present application;

fig. 6 is a schematic partial structure of a battery cell according to some embodiments of the present application;

fig. 7 is a schematic structural view of a battery cell transfer tab according to some embodiments of the present application;

Fig. 8 is a schematic structural view of a battery cell transfer tab according to another embodiment of the present application;

fig. 9 is a schematic partial structure of a battery cell according to other embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

1000-vehicle, 1-battery device, 2-controller, 3-motor, 1 a-battery unit component, 100-battery unit, 200-box, 210-first box and 220-second box;

10-shell, 10 a-containing cavity, 11-shell, 121-cover plate and 122-pressure release mechanism;

20-electrode assembly, 21-main body part, 22-tab, 221-first matrix, 222-second matrix;

30-electrode terminals;

40-rotating sheet, 40 a-notch, 41-terminal connecting part, 42-tab connecting part;

X-first direction, Y-second direction, Z-third direction.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In describing embodiments of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Currently, the battery device is more widely used in view of the development of market situation. The battery device is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, as well as a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of battery devices, the market demand of the battery devices is also continuously expanding.

The development of battery technology is to consider various design factors, such as battery life, energy density, discharge capacity, charge-discharge rate, and other performance parameters.

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited by the embodiment of the application.

In the battery cell in the related art, after the tab of the electrode assembly is bent, the tab is usually connected with one side of the main body part of the switching piece, which is opposite to the main body part of the electrode assembly, namely, the tab after connection is positioned between the switching piece and the main body part, and the tab and the switching piece after connection occupy a larger space in the battery cell, so that the energy density of the battery cell is not beneficial to improvement.

Based on the technical problems, the embodiment of the application provides a battery cell, which comprises a shell, an electrode assembly, an electrode terminal and a switching piece. The housing has a receiving cavity. The electrode assembly is accommodated in the accommodating chamber, and the electrode assembly includes a body portion and a tab connected to each other. The electrode terminal is disposed at one side of the case and located at the electrode assembly in the first direction. The switching piece holds in holding the chamber, and the switching piece is connected with utmost point ear and electrode terminal respectively. The switching piece part is arranged between the tab and the main body part along the first direction.

The part of the switching piece is arranged between the lug and the main body part along the first direction, so that the occupied space after the switching piece is connected with the lug is reduced, the space utilization rate is improved, and the energy density of the battery cell is improved.

The technical scheme described in the embodiment of the application is applicable to various electric devices using battery monomers, such as mobile phones, portable equipment, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, spacecraft and the like, and for example, the spacecraft comprises planes, rockets, spaceships, spacecraft and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described devices, but may be applied to all devices using battery cells, but for simplicity of description, the following embodiments are described by taking an electric vehicle as an example.

For example, as shown in fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to an embodiment of the present application, the vehicle 1000 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The motor 3, the controller 2, and the battery device 1 may be provided inside the vehicle 1000, and the controller 2 is configured to control the battery device 1 to supply power to the motor 3. For example, the battery device 1 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery device 1 may be used for power supply of the vehicle 1000, for example, the battery device 1 may be used as an operation power source of the vehicle 1000, for a circuit system of the vehicle 1000, for example, for operation power demand at the time of starting, navigation, and running of the vehicle 1000. In another embodiment of the present application, the battery device 1 may not only serve as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, instead of or in part instead of fuel oil or natural gas, to supply driving power to the vehicle 1000.

Referring to fig. 2 and 3, the battery device 1 (Battery Apparatus) according to the embodiment of the present application may include one or more battery cell assemblies 1a for providing voltage and capacity. The battery cell assembly 1a (Battery Cell Assembly) may include a plurality of battery cells 100, and the plurality of battery cells 100 are connected in series, parallel, or series-parallel by a bus bar member.

In some embodiments, the cell assembly 1a (Battery Cell Assembly) is generally formed by an arrangement of a plurality of cells 100.

As an example, the Battery cell assembly 1a may be a Battery Module (Battery Module) formed by arranging and fixing a plurality of Battery cells 100 into one independent Module. As an example, the battery module may be formed by binding a plurality of battery cells 100 by a tie.

As shown in fig. 2, in some embodiments, the battery device 1 may be a battery Pack (battery Pack) including a case 200 and one or more battery cell assemblies 1a, the battery cell assemblies 1a being accommodated in the case 200.

As an example, the battery cell assembly 1a may be a battery module, and the battery cell assembly 1a may be accommodated in the case 200 in such a manner that the battery module is fixed in the case 200.

As an example, the battery cell assembly 1a may be accommodated in the case 200 in such a manner that the plurality of battery cells 100 are directly fixed to the case 200.

As an example, the case 200 may include a first case 210 and a second case 220. The first case 210 and the second case 220 are fastened such that a closed space is formed inside the case 200 to receive the battery cell assembly 1a. The closing means covering or closing, and can be sealing or unsealing. The first casing 210 may be a top cover or a bottom plate.

As an example, the case 200 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame such that an enclosed space is formed inside the case 200 to receive the battery cell assembly 1a.

In some embodiments, the tank 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the tank 200 may become at least a portion of the floor of the vehicle 1000, or a portion of the tank 200 may become at least a portion of the cross and side members of the vehicle 1000.

In the present application, the battery cell 100 may include a lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in the embodiment of the present application.

As an example, the battery cell 100 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square case battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal-prism battery cell, etc., and the present application is not particularly limited.

Referring to fig. 3 to 6, a battery cell 100 according to an embodiment of the present application includes a case 10, an electrode assembly 20, and electrode terminals 30 and tabs 40.

The case 10 is a component for forming the internal environment of the battery cell 100, which can be used to house the electrode assembly 20, the tab 40, and also can be used to house an electrolyte and other components. Alternatively, the housing 10 may be, but is not limited to being, made of a metal or a non-metal material, for example, copper, aluminum, stainless steel, etc., and the non-metal material may be polyethylene, polypropylene, polyvinyl chloride, etc.

For example, the housing 10 may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper aluminum composite housing), an aluminum plastic film, or the like.

In some embodiments, the housing 10 may be a sealed structure or a non-sealed structure. As an example, when the case 10 is of a non-sealing structure, the case 10 plays a role of protecting the electrode assembly 20, and a sealing pouch for sealing the electrode assembly 20 and the electrolyte is further included between the case 10 and the electrode assembly 20. In particular, the sealed bag may be a bag-like insulating member or an aluminum plastic film. The case 10 is used for sealing the electrode assembly 20 and the electrolyte when it has a sealed structure.

The shape of the case 10 may be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 10 may be used, and if the electrode assembly 20 has a cylindrical structure, a cylindrical housing 10 may be used.

Electrode assemblies 20 are components of battery cell 100 where an electrochemical reaction occurs, and one or more electrode assemblies 20 may be contained within housing 10.

In some embodiments, the electrode assembly 20 may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

The electrode assembly 20 may be a wound structure, a laminated structure, or a hybrid structure of wound and laminated structures.

The electrode assembly 20 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charge and discharge of the battery cell 100, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector. In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

The electrode terminals 30 may be used to be electrically connected with the electrode assembly 20 for outputting or inputting electric power of the battery cell 100.

In some embodiments, the battery cell 100 further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need.

Referring to fig. 4 to 6, a battery cell 100 according to an embodiment of the present application includes a case 10, an electrode assembly 20, an electrode terminal 30, and a switching piece 40. The housing 10 has a receiving chamber 10a. The electrode assembly 20 is received in the receiving chamber 10a, and the electrode assembly 20 includes a body part 21 and a tab 22 connected to each other. The electrode terminal 30 is disposed at the case 10 at one side of the electrode assembly 20 in the first direction X. The tab 40 is accommodated in the accommodation chamber 10a, and the tab 40 is connected to the tab 22 and the electrode terminal 30, respectively. Wherein, along the first direction X, the switching piece 40 is partially disposed between the tab 22 and the main body 21.

In the embodiment of the present application, the first direction X may be expressed as a height direction of the electrode assembly 20, the second direction Y may be expressed as a width direction of the electrode assembly 20, and the third direction Z may be expressed as a length direction of the electrode assembly 20.

The receiving chamber 10a serves to receive the electrode assembly 20 and the tab 40 so that the case 10 can protect its internal components.

The electrode assembly 20 includes a body portion 21 and a tab 22, the tab 22 may guide out a current from the body portion 21, wherein the tab 22 may include a positive tab and a negative tab.

Illustratively, the main body portion 21 is provided with a tab 22 on one side in the first direction X.

At least one electrode terminal 30 is provided on the case 10, and the electrode terminal 30 is used to be electrically connected with the electrode assembly 20 to output or input electric power of the battery cell 100. The electrode terminal 30 may be electrically connected to the electrode assembly 20 by being connected to the tab 22.

The switching tab 40 is used to achieve electrical connection between the electrode terminal 30 and the tab 22, and the kind of material of the switching tab 40 is not limited, and may be copper or aluminum, for example.

According to the battery cell 100 provided by some embodiments of the present application, the battery cell 100 includes the housing 10, the electrode assembly 20, the electrode terminal 30 and the switching piece 40, wherein the electrode assembly 20 and the electrode terminal 30 can be electrically connected through the switching piece 40, and by arranging at least part of the switching piece 40 between the tab 22 and the main body portion 21 along the first direction X, the space occupied by the switching piece 40 after being connected with the tab 22 can be reduced, so that the space for accommodating the main body portion 21 in the accommodating cavity 10a is increased, and the size of the main body portion 21 along the first direction X can be designed to be larger, which is beneficial for improving the energy density of the battery cell 100.

As the transfer sheet 40 is partially disposed between the tab 22 and the body 21 in the first direction X, it is understood that a portion of the transfer sheet 40 may be disposed between the tab 22 and the body 21 in the first direction X to be connected to the tab 22, and another portion of the transfer sheet 40 may be connected to the electrode terminal 30.

According to the battery cell 100 provided by some embodiments of the present application, the battery cell 100 includes the case 10, the electrode assembly 20, the electrode terminal 30 and the switching piece 40, wherein the electrode assembly 20 and the electrode terminal 30 are electrically connected through the switching piece 40, and the switching piece 40 is partially disposed between the tab 22 and the main body 21 along the first direction X, so that the arrangement of the switching piece 40, the tab 22 and the main body 21 is more compact, the space occupied by the switching piece 40 after being connected with the tab 22 can be reduced, the space for accommodating the main body 21 in the accommodating cavity 10a is increased, and the size of the main body 21 along the first direction X can be designed to be larger, which is beneficial for improving the energy density of the battery cell 100.

That is, by the above arrangement, the length of the main body 21 along the first direction X can be increased under the condition that the length of the battery cell 100 along the first direction X is unchanged, which is beneficial to improving the energy density of the battery cell 100, or the length of the whole battery cell 100 along the first direction X can be reduced under the condition that the length of the main body 21 along the first direction X is unchanged, which is beneficial to improving the space utilization rate of the battery cell 100.

The number of the electrode assemblies 20 may be set to one, two, or, of course, a plurality.

Referring to fig. 4 and 5, in some alternative embodiments, the housing 10 includes a casing 11 and an end cap assembly, the casing 11 has an opening along a first direction X, the end cap assembly includes a cover 121, the cover 121 covers the opening and encloses with the casing 11 to form a receiving cavity 10a, and the electrode terminal 30 is disposed on the cover 121.

The housing 11 may be provided in a box-like structure having an opening at one side in the first direction X, the cover plates 121 may be provided as one and cover the opening to enclose the housing 11 to form the accommodation chamber 10a, or the housing 11 may be provided in a cylindrical structure having openings at both sides in the first direction X, and the two cover plates 121 are respectively covered on one opening to enclose the housing 11 to form the accommodation chamber 10a.

The case 11 is an assembly for cooperating with the end cap assembly to form the internal environment of the battery cell 100, and serves to accommodate the electrode assembly 20, the electrolyte, the switching sheet 40, and other components.

The cap assembly includes a cap plate 121, which means a member that is capped at the opening of the case 11 to isolate the inner environment of the battery cell 100 from the outer environment. The cover plate 121 may have a circular, rectangular, oval or other shape.

The end cap assembly may also include a pressure relief mechanism 122, the pressure relief mechanism 122 for relieving the internal pressure of the battery cell 100 when the internal pressure or temperature reaches a threshold. In the third direction Z, two sides of the pressure release mechanism 122 may be respectively and alternately provided with one electrode terminal 30.

According to the battery cell 100 provided by some embodiments of the present application, the electrode terminal 30 is disposed on the cover plate 121, so that the electrode terminal 30 is conveniently formed or assembled on the cover plate 121, connection between the switching piece 40 and the electrode terminal 30 is facilitated, positions of the electrode terminal 30, the switching piece 40 and the tab 22 can be reasonably arranged, and assembly between the three can be facilitated.

In some alternative embodiments, as shown in fig. 6, the tab 22 is bent, and the tab 22 is connected to a surface of the adaptor 40 facing away from the main body 21 along the first direction X.

The tab 22 is bent to ensure the effectiveness of the portion of the tab 40 that can be disposed between the tab 22 and the main body 21 in the first direction X.

It will be appreciated that the area of the surface of the adapting piece 40 along the first direction X is larger than the area of the surface of the adapting piece 40 along the second direction Y, so that the connection between the tab 22 and the adapting piece 40 is facilitated by the above arrangement, which is beneficial to reducing the assembly difficulty, and meanwhile, the connection area between the tab 22 and the adapting piece 40 is also beneficial to improving the overcurrent capacity between the tab 22 and the adapting piece, thereby improving the energy density of the battery cell 100.

In addition, the tab 22 is connected to a side surface of the adapter piece 40 facing away from the main body 21 along the first direction X, so that the tab 22 and the adapter piece 40 can be more compact in arrangement along the first direction X, so as to reduce the space occupied by the tab 22 in the first direction X, and thus the main body 21 can have more arrangement space along the first direction X, which is beneficial to improving the energy density of the battery cell 100.

As shown in fig. 7, in some embodiments, the tab 40 is provided with a notch 40a, whereby the tab 22 can be passed through and bent over by the notch 40a to connect with the tab 40 located on the peripheral side of the notch 40 a.

In other embodiments, the tab 22 can be inserted through the circumferential side of the tab 40 and bent to connect with the tab 40.

With continued reference to fig. 6, in some alternative embodiments, the tab 22 includes a first base 221 and a second base 222 disposed to intersect, the first base 221 is connected between the main body 21 and the second base 222, the first base 221, the second base 222 and the main body 21 enclose a receiving space, and the rotating tab 40 is partially located in the receiving space and connected to the second base 222.

The tab 22 includes a first base 221 and a second base 222 disposed to intersect, and it is understood that the first base 221 intersects with the extending direction of the second base 222.

In some alternative embodiments, the first substrate 221 may be disposed to extend in the first direction X, and the second substrate 222 may be disposed to extend in the second direction Y.

Through the arrangement, the tab 22 is convenient to manufacture, the forming of the tab 22 is facilitated, and the space occupied by the bent tab 22 along the first direction X is reduced.

In some embodiments, the length dimension of the first substrate 221 in the first direction X is greater than or equal to the length dimension of the tab 40 in the first direction X to ensure the effectiveness of the portion of the tab 40 that can be located in the receiving space.

Illustratively, the length dimension of the first substrate 221 in the first direction X is equal to the length dimension of the switching tab 40 in the first direction X, so that the switching tab 40, the tab 22, and the main body 21 are more compact, which is beneficial to improving the space utilization and thus the energy density of the battery cell 100.

In some alternative embodiments, the main body 21, the switching piece 40, and the second base 222 are sequentially stacked in the first direction X, and the first base 221 is disposed in contact with a side wall surface of the switching piece 40.

The sequential lamination of the main body 21, the tab 40, and the second base 222 in the first direction X is understood to mean that the main body 21, the tab 40, and the second base 222 are sequentially abutted in the first direction X, that is, there is no gap between the main body 21 and the tab 40 in the first direction X, and there is no gap between the tab 40 and the second base 222 in the first direction X, so that the three are more compact in the first direction X.

The fact that the first base 221 is attached to the side wall surface of the adapter piece 40 means that there is no gap between the first base 221 and the adapter piece 40 in the second direction Y, so that the arrangement of the first base 221 and the adapter piece in the second direction Y is more compact.

By the above arrangement, the battery cell 100 provided in some embodiments of the present application makes the arrangement of the switching tab 40, the main body 21 and the tab 22 more compact, and reduces the occupied area of the tab 22 and the switching tab 40 after they are connected, so that the accommodating cavity 10a has more space to accommodate the main body 21, which is beneficial to improving the energy density of the battery cell 100.

Referring to fig. 6 and 7, in some alternative embodiments, the tab 40 has a notch 40a, and the tab 22 is disposed through the notch 40a and bent so that the tab 40 is located between the tab 22 and the main body 21 along the first direction X.

The notch 40a is understood to mean that the adapter piece 40 has a through hole disposed along the first direction X, and a side surface of the adapter piece 40 along a certain direction has an opening communicating with the through hole.

The tab 22 can be disposed through the notch 40a and bent toward the tab 40 such that, in the first direction X, a portion of the tab 40 is located between the bent portion of the tab 22 and the main body 21.

For example, the tab 22 is bent to form a first base 221 and a second base 222, which are disposed in an intersecting manner, the first base 221 is disposed through the notch 40a, and a portion of the adapter piece 40 is located between the second base 222 and the main body 21 in the first direction X.

The battery cell 100 provided by some embodiments of the present application is configured in the above manner, so that the assembly is convenient, and the material consumption of the switching piece 40 can be reduced, which is beneficial to reducing the use cost of the switching piece 40, thereby reducing the cost of the battery cell 100.

In some embodiments, the opening direction of the notch 40a is disposed toward the second direction Y, and in other embodiments, the opening direction of the notch 40a is disposed toward the third direction Z.

Alternatively, the radial dimension of the notch 40a may be equal to or greater than the thickness of the tab 22, so that the tab 22 passes through the notch 40 a.

With continued reference to fig. 7, in some alternative embodiments, the switching piece 40 includes a terminal connection portion 41 and a tab connection portion 42, the tab connection portion 42 is disposed on at least one side of the notch 40a along the second direction Y, the terminal connection portion 41 is disposed on one side of the notch 40a along the third direction Z, the tab connection portion 42 is connected to the tab 22, the terminal connection portion 41 is connected to the electrode terminal 30, and the third direction Z intersects the first direction X and the second direction Y.

The tab connection portion 42 is disposed between the tab 22 and the main body 21 along the first direction X.

The terminal connection portion 41 is a structure for connecting with the electrode terminal 30 in the tab 40, and the tab connection portion 42 is a structure for connecting with the tab 22 in the tab 40.

The battery cell 100 provided by some embodiments of the present application is disposed in the above manner, and has reasonable layout, which is convenient for processing and manufacturing the adapter piece 40, and is convenient for assembling the battery cell 100.

Alternatively, the connection between the tab connection part 42 and the tab 22 may be ultrasonic welding, and the connection between the terminal connection part 41 and the electrode terminal 30 may be laser welding.

In some embodiments, the tab connection portion 42 is disposed at one side of the notch 40a along the second direction Y, and the tab 22 may be disposed through the notch 40a and bent to connect with the tab connection portion 42, and the tab 22 may be disposed through the tab connection portion 42 along one side of the second direction Y opposite to the notch 40a and bent to connect with the tab connection portion 42.

For example, one tab 40 is used for connecting two tabs 22, and the tab connection portion 42 is disposed at one side of the notch 40a along the second direction Y, wherein one tab 22 may be passed through and bent by the notch 40a to connect with the tab connection portion 42, and the other tab may be passed through and bent by the tab connection portion 42 along one side of the second direction Y opposite to the notch 40a to connect with the tab connection portion 42. Wherein the two tabs 22 are bent towards each other.

In some embodiments, the tab connection portions 42 are disposed on two sides of the notch 40a along the second direction Y.

For example, one tab 40 is used for connecting two tabs 22, and tab connection portions 42 are disposed on two sides of the notch 40a along the second direction Y, and the two tabs 22 are each penetrated by the notch 40a and are bent back to each other, wherein one tab 22 is connected to the tab connection portion 42 located on one side of the notch 40a along the second direction Y, and the other tab 22 is connected to the tab connection portion 42 located on the other side of the notch 40a along the second direction Y.

As shown in fig. 7, in some alternative embodiments, the number of tab connection portions 42 is two or more, and the two or more tab connection portions 42 are arranged side by side along the second direction Y, with a gap 40a formed between two adjacent tab connection portions 42.

By this arrangement, one tab 22 can be connected corresponding to one tab connection portion 42, so that the occurrence of interference problem is avoided, so that the layout of the switching piece 40 is reasonable, and the connection with the tab 22 is facilitated.

Referring to fig. 8 and 9, in some alternative embodiments, the number of the notches 40a is two or more, and the two or more notches 40a are spaced apart along the second direction Y.

One of the tabs 40 may be provided with two or more notches 40a so as to facilitate assembly with different numbers of the electrode assemblies 20, thereby facilitating improvement of the efficiency of manufacturing the tabs 40 and reduction of the cost of the tabs 40.

Alternatively, the number of the notches 40a of the adapter piece 40 may be two or three, but may be more.

For example, the transfer sheet 40 has two notches 40a spaced apart along the second direction Y, and tab connection parts 42 are provided at both sides of each notch 40a along the second direction Y, and the transfer sheet 40 of this structure may be used for assembly with two electrode assemblies 20 arranged along the second direction Y, and may also be used for assembly with four electrode assemblies 20 arranged along the second direction Y.

In some embodiments, the tab 40 has two notches 40a spaced apart along the second direction Y, and the tab 40 of this structure may be used to assemble two electrode assemblies 20 arranged along the second direction Y, wherein the tabs 22 on two electrode assemblies 20 are disposed opposite to each other, that is, the tab 22 on one electrode assembly 20 is disposed on a side of the main body 21 opposite to the other electrode assembly 20 along the second direction Y, so that one tab 22 can be disposed corresponding to one notch 40a, i.e., one tab 22 extends from one notch 40a and is bent to connect with the tab 22 on either side of the notch 40a along the second direction Y.

In other embodiments, the tab 40 has two notches 40a spaced apart along the second direction Y, and the tab 40 of this structure may be used to assemble four electrode assemblies 20 arranged along the second direction Y, wherein the tabs 22 of each two electrode assemblies 20 are disposed toward each other, that is, the tab 22 on one electrode assembly 20 is disposed on the side of the main body 21 toward the other electrode assembly 20 along the second direction Y, so that two tabs 22 can be disposed corresponding to one notch 40a, i.e., two tabs 22 protrude from one notch 40a and are bent away from each other to be respectively connected to the tab 22 on one side of the notch 40a along the second direction Y.

In some alternative embodiments, tab connection 42 is a unitary structure with terminal connection 41.

For example, a tab connection portion 42 and a terminal connection portion 41 are integrally formed by a thin plate-like structure through processes such as punching, bending, cutting, and the like.

By this mode, the processing efficiency of the switching piece 40 is improved, the connection strength between the tab connection part 42 and the terminal connection part 41 is ensured, the structural strength of the switching piece 40 is ensured, and the reliability of the battery cell 100 is ensured.

Or the tab connection portion 42 and the terminal connection portion 41 may be provided separately.

For example, the tab connection portion 42 and the terminal connection portion 41 are separate plates, and the plurality of plates are spliced to form the switching piece 40. The tab connection portion 42 and the terminal connection portion 41 may be connected by welding.

In some alternative embodiments, the thickness of the tab connection portion 42 is the same as the thickness of the terminal connection portion 41 along the first direction X.

The battery unit 100 provided by some embodiments of the present application is configured in the above manner, so as to facilitate processing and manufacturing of the switching piece 40, thereby facilitating reduction of processing difficulty and improvement of manufacturing efficiency.

In some embodiments, the tab connection portion 42 has the same thickness as the terminal connection portion 41, and both have a height difference in the first direction X.

That is, the tab connection part 42 is located at a side of the terminal connection part 41 facing away from the electrode assembly 20 in the first direction X, or the terminal connection part 41 is located at a side of the tab connection part 42 facing away from the electrode assembly 20 in the first direction X, by which the positions of the tab connection part 42 and the terminal connection part 41 of the tab 40 can be designed according to the positions of the tab 22 and the electrode terminal 30 in the first direction X, so that the tab connection part 42 is connected with the tab 22 and the terminal connection part 41 is connected with the electrode terminal 30, and at the same time, the connection tightness is improved.

In some embodiments, the tab connection portion 42 has the same thickness as the terminal connection portion 41, and both have no height difference in the first direction X.

Referring to fig. 5 and 7, in some alternative embodiments, one side surface of the tab connection portion 42 along the first direction X is coplanar with one side surface of the terminal connection portion 41 along the first direction X, and the other side surface of the tab connection portion 42 along the first direction X is coplanar with the other side surface of the terminal connection portion 41 along the first direction X.

That is, in the first direction X, the top surface of the tab connection portion 42 is disposed coplanar with the top surface of the terminal connection portion 41, and the bottom surface of the tab connection portion 42 is disposed coplanar with the bottom surface of the terminal connection portion 41.

The coplanar arrangement is understood to mean that the top surface of the tab connection portion 42 and the top surface of the terminal connection portion 41 are located in the same extension plane, and the bottom surface of the tab connection portion 42 and the bottom surface of the terminal connection portion 41 have no height difference in the first direction X.

The battery unit 100 provided by some embodiments of the present application is configured in the above manner, so as to facilitate processing and manufacturing of the switching piece 40, thereby facilitating reduction of processing difficulty and improvement of manufacturing efficiency.

Referring to fig. 5 to 9, in some alternative embodiments, the number of electrode assemblies 20 is set to n, n is an even number, the number of notches 40a is n/2, the tabs 22 of each two adjacent electrode assemblies 20 are disposed through the same notch 40a, and the tabs 22 of each two adjacent electrode assemblies 20 are symmetrical and disposed close to each other.

In the embodiment of the present application, the number of the electrode assemblies 20 is set to be an even number, and the number of the notches 40a is set to be half of the number of the electrode assemblies 20, by which the tabs 22 of each adjacent two of the electrode assemblies 20 can be penetrated by the same notch 40a, so that the assembly is facilitated.

The tab 22 of each adjacent two electrode assemblies 20 is disposed through the same notch 40a, it may be understood that n electrode assemblies 20 are arranged along the second direction Y, the 1 st electrode assembly 20 and the 2 nd electrode assembly 20 located at the outermost side along the second direction Y among the n electrode assemblies 20 are represented as adjacent two electrode assemblies 20, the 3 rd electrode assembly 20 and the 4 th electrode assembly 20 are represented as adjacent two electrode assemblies 20, and the n-1 st electrode assembly 20 and the n electrode assembly 20 are represented as adjacent two electrode assemblies 20.

As the tabs 22 of each adjacent two electrode assemblies 20 are symmetrically disposed and are close to each other, it is understood that the tab 22 of one electrode assembly 20 is disposed on one side of the main body 21 facing the other electrode assembly 20 along the second direction Y, and the two tabs 22 are bent back to each other, so that the two tabs 22 pass through the same notch 40a and are connected to the tab connection portions 42, respectively.

In some embodiments, the transfer sheet 40 is integrally provided as a plate-like structure extending in the second direction Y.

Referring to fig. 5, 7 and 9, in some alternative embodiments, the tabs 22 of the same electrode assembly 20 are arranged in pairs, and the notches 40a are disposed toward the tabs 22 arranged in pairs in the arrangement direction of the tabs 22 arranged in pairs.

In the embodiment of the present application, the arrangement direction of the tabs 22 arranged in pairs is the third direction Z.

The two tabs 22 of the same electrode assembly 20 are arranged along the third direction Z, the notches 40a of the switching pieces 40 are disposed towards the two tabs 22 along the third direction Z, and it is understood that the two tabs 22 included in the same electrode assembly 20 need to be connected with one switching piece 40 respectively to be electrically connected with the electrode terminal 30, that is, the two switching pieces 40 are arranged along the third direction Z, the notches 40a of the two switching pieces 40 are disposed towards each other, and the tabs 22 disposed in pairs are located between the two switching pieces 40.

The battery unit 100 provided in some embodiments of the present application is configured in the above manner, so as to facilitate the assembly of the switching piece 40 and the tab 22, so as to avoid the interference with one tab 22 when the switching piece 40 is connected with the other tab 22, thereby facilitating the improvement of the assembly efficiency and ensuring the reliability of the battery unit 100.

In some embodiments, the electrode terminal 30 falls into the orthographic projection of the main body 21 in the first direction X, and is located on a side of one tab 22 facing away from the other tab 22, so that the electrode terminal 30 is connected to the terminal connection portion 41 located on a side of the notch 40a along the third direction Z.

Illustratively, the electrode terminals 30 are arranged in pairs, the electrode terminals 30 arranged in pairs being arranged along the second direction Y, and the orthographic projections of the two tabs 22 being located between the orthographic projections of the two electrode terminals 30 along the second direction Y in a plane perpendicular to the first direction X.

The battery cell 100 provided by some embodiments of the present application is disposed in the above manner, and is reasonable in layout, so that the assembly of the switching piece 40, the tab 22 and the electrode terminal 30 is facilitated.

According to some embodiments of the present application, the present application further provides a battery device including a plurality of the battery cells 100 provided in any of the above embodiments.

According to some embodiments of the present application, there is further provided an electrical device, including a plurality of the battery cells 100 provided in any of the above embodiments or the battery device provided in any of the above embodiments, where the battery cells 100 or the battery device are used to store or provide electrical energy.

Referring to fig. 5, 6, 7 and 9, a battery cell 100 is provided according to an embodiment of the present application, and includes a case 10, an electrode assembly 20, an electrode terminal 30 and a switching piece 40.

The housing 10 includes a case 11 having an opening in a first direction X, and an end cap assembly including a cover plate 121, the cover plate 121 covering the opening and enclosing the case 11 to form a receiving chamber 10a.

The electrode assembly 20 is accommodated in the accommodating cavity 10a and comprises a main body part 21 and a tab 22 which are connected with each other, the tab 22 comprises a first substrate 221 and a second substrate 222 which are arranged in an intersecting manner, the first substrate 221 is connected between the main body part 21 and the second substrate 222, and the first substrate 221, the second substrate 222 and the main body part 21 enclose to form an accommodating space. The electrode terminal 30 is disposed at the cap plate 121 and located at one side of the electrode assembly 20 in the first direction X.

The tab 40 is accommodated in the accommodation chamber 10a and is connected to the tab 22 and the electrode terminal 30, respectively. The switching piece 40 has a notch 40a, and the tab 22 is disposed through the notch 40a and bent. The number of the electrode assemblies 20 is set to n, n is an even number, the number of the notches 40a is n/2, the tabs 22 of every two adjacent electrode assemblies 20 penetrate through the same notch 40a, and the tabs 22 of every two adjacent electrode assemblies 20 are symmetrical and are arranged close to each other. The tabs 22 of the same electrode assembly 20 are arranged in pairs, and the notches 40a are arranged toward the tabs 22 arranged in pairs in the arrangement direction of the tabs 22 arranged in pairs.

The switching piece 40 includes terminal connection parts 41 and tab connection parts 42 of an integrated structure, the number of the tab connection parts 42 is two or more, the two or more tab connection parts 42 are arranged side by side along the second direction Y, a notch 40a is formed between two adjacent tab connection parts 42, the terminal connection parts 41 are arranged on one side of the notch 40a along the third direction Z, the tab connection parts 42 are connected to the tabs 22, the terminal connection parts 41 are connected to the electrode terminals 30, and the third direction Z intersects with the first direction X and the second direction Y.

The tab 22 is connected to a surface of the adapter piece 40 facing away from the main body 21 along the first direction X, and the adapter piece 40 is at least partially located in the accommodating space and connected to the second base 222 along the first direction X. The main body 21, the switching piece 40, and the second base 222 are stacked in this order in the first direction X, and the first base 221 is bonded to the side wall surface of the switching piece 40.

One side surface of the tab connection part 42 in the first direction X is disposed coplanar with one side surface of the terminal connection part 41 in the first direction X, and the other side surface of the tab connection part 42 in the first direction X is disposed coplanar with the other side surface of the terminal connection part 41 in the first direction X.

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

It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit the technical solution of the present application, and although the detailed description of the present application is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application, and all the modifications or substitutions are included in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (16)

1. A battery cell, comprising: a housing having a receiving cavity; An electrode assembly is accommodated in the accommodation cavity, wherein the electrode assembly includes a main body and tabs connected to each other; an electrode terminal, disposed on the housing and located on one side of the electrode assembly along the first direction; A transfer plate is accommodated in the accommodation cavity, and the transfer plate is connected to the tab and the electrode terminal respectively; Wherein, along the first direction, the adapter portion is arranged between the tab and the main body. 2. The battery cell according to claim 1 is characterized in that the outer shell includes a shell and an end cover assembly, the shell has an opening along the first direction, the end cover assembly includes a cover plate, the cover plate covers the opening and is enclosed with the shell to form the accommodating cavity, and the electrode terminal is arranged on the cover plate. 3 . The battery cell according to claim 1 , wherein the tab is bent and connected to a surface of the adapter plate facing away from the main body along the first direction. 4. The battery cell according to claim 1 or 2, characterized in that the tab includes a first base and a second base arranged to intersect each other, the first base is connected between the main body and the second base, the first base, the second base and the main body together form a accommodating space, and the adapter is partially located in the accommodating space and connected to the second base. 5 . The battery cell according to claim 4 , wherein the main body, the adapter plate and the second base are stacked in sequence in the first direction, and the first base is bonded to a side wall of the adapter plate. 6 . The battery cell according to claim 1 , wherein the adapter plate has a notch, the tab is passed through the notch and is bent so that the adapter plate is partially located between the tab and the main body along the first direction. 7. The battery cell according to claim 6 is characterized in that the adapter plate includes a terminal connecting portion and a tab connecting portion, the tab connecting portion is arranged on at least one side of the notch along the second direction, the terminal connecting portion is arranged on one side of the notch along the third direction, the tab connecting portion is connected to the tab, and the terminal connecting portion is connected to the electrode terminal, and the third direction intersects with the first direction and the second direction. 8 . The battery cell according to claim 7 , wherein the number of the tab connection parts is set to two or more, the two or more tab connection parts are arranged side by side along the second direction, and the gap is formed between two adjacent tab connection parts. 9 . The battery cell according to claim 8 , wherein the number of the notches is set to two or more, and the two or more notches are spaced apart and distributed along the second direction. 10 . The battery cell according to claim 7 , wherein the tab connection portion and the terminal connection portion are an integrated structure. 11 . The battery cell according to claim 7 , wherein along the first direction, the thickness of the tab connection portion is the same as the thickness of the terminal connection portion. 12. The battery cell according to any one of claims 7 to 9, characterized in that a side surface of the tab connection portion along the first direction is coplanar with a side surface of the terminal connection portion along the first direction, and another side surface of the tab connection portion along the first direction is coplanar with another side surface of the terminal connection portion along the first direction. 13. The battery cell according to any one of claims 7 to 9, characterized in that the number of the electrode assemblies is set to n, n is an even number, the number of the gaps is n/2, the tabs of each two adjacent electrode assemblies are passed through the same gap, and the tabs of each two adjacent electrode assemblies are symmetrical and close to each other. 14 . The battery cell according to claim 7 , wherein the tabs of the same electrode assembly are arranged in pairs, and in an arrangement direction of the paired tabs, the notches are arranged toward the paired tabs. 15 . A battery device, comprising a plurality of battery cells according to claim 1 . 16 . An electrical device, characterized in that it comprises a plurality of battery cells according to any one of claims 1 to 14 or the battery device according to claim 15 , wherein the battery cells or the battery device are used to store or provide electrical energy.