CN216488286U - Battery cell, battery and power consumption device - Google Patents

Abstract

The present application provides a battery cell, a battery and an electrical device. The battery cell includes a casing, an electrode assembly and an adapter. The electrode assembly is accommodated in the casing, and the electrode assembly includes an electrode body and first and second electrode tabs protruding from the electrode body, and the first and second electrode tabs have the same polarity. The adapter includes a terminal connection part and a tab connection part, and the terminal connection part is used for connecting with the electrode terminals of the battery cells. The tab connecting part includes a first connecting part and a second connecting part respectively connecting the first tab and the second tab. In the battery cell provided in the present application, the electrode assembly is provided with a first tab and a second tab with the same polarity, and the first connection portion and the second connection portion of the adapter are respectively connected to the first tab and the second tab. The pole lugs can effectively increase the overcurrent area of the adapter, so that during the cycle operation of the battery cell, the overcurrent capability can be improved, the temperature rise rate of the adapter can be reduced, and the working safety of the battery cell can be improved.

Description

Battery cells, batteries and electrical devices

technical field

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

Background technique

Battery cells are widely used in electronic equipment, such as mobile phones, notebook computers, battery cars, electric vehicles, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc.

In the development of battery technology, how to improve the overcurrent capability of battery cells is an urgent technical problem to be solved in battery technology.

Utility model content

The present application provides a battery body, a battery and an electrical device, which can improve the overcurrent capability, reduce the temperature rise during the working process of the battery cell, and improve the safety of the battery cell.

In a first aspect, the present application proposes a battery cell, comprising: a casing; an electrode assembly, housed in the casing, the electrode assembly includes an electrode body and first and second tabs protruding from the electrode body. The polarities of the first tab and the second tab are the same; the adapter includes a terminal connecting part and a tab connecting part, the terminal connecting part is used for connecting with the electrode terminals of the battery cells, and the tab connecting part includes a first connecting part and a tab connecting part. The second connecting portion, the first connecting portion and the second connecting portion are respectively connected to the first tab and the second tab.

In the battery cell provided in the embodiment of the present application, the electrode assembly is provided with a first tab and a second tab with the same polarity, and the first connection portion and the second connection portion of the adapter are respectively connected to one The first tab and the second tab of the electrode assembly can effectively increase the overcurrent area of the adapter and improve the overcurrent capability, so that during the cycle of the battery cell, especially during the high rate charging process, The temperature rise rate of the adapter can be effectively reduced, and the working safety of the battery cell can be improved.

In some embodiments, the first tab and the second tab protrude out of the electrode body along the first direction, and the battery cell further includes two first surfaces oppositely arranged along the second direction and two oppositely arranged surfaces along the third direction Two second surfaces, the area of the first surface is larger than that of the second surface, the first direction, the second direction and the third direction are perpendicular to each other; the first tab and the second tab are arranged along the second direction, the first The connecting portion and the second connecting portion are spaced apart along the second direction. With this arrangement, the flow area of the adapter can still be increased, and the temperature rise rate of the adapter can be reduced.

In some embodiments, the first tab and the second tab protrude out of the electrode body along the first direction, and the battery cell further includes a first surface oppositely arranged along the second direction and a second oppositely arranged along the third direction Surface, the area of the first surface is greater than the area of the second surface, the first direction, the second direction and the third direction are perpendicular to each other; the first tab and the second tab are spaced along the third direction, and the first connection part and The second connection portions are respectively located on both sides of the terminal connection portion along the third direction. With this arrangement, the flow area of the adapter can still be increased, and the temperature rise rate of the adapter can be reduced. At the same time, the first tab and the second tab are arranged along the third direction, and the terminal connecting portion is arranged between the first tab and the second tab, which also facilitates the spatial layout of each structure in the battery cell.

In some embodiments, the distance between the first tab and the second tab along the third direction is greater than or equal to 7 mm. This facilitates the smooth processing of the first tab and the second tab, and can also effectively reduce the risk of conductive connection between the two during operation, thereby reducing the risk of shunt failure of the adapter.

In some embodiments, a plurality of electrode assemblies are arranged, and the plurality of electrode assemblies are arranged side by side along the second direction; the adaptor includes a plurality of tab connecting parts, the plurality of tab connecting parts are arranged along the second direction, and one pole The ear connector is connected to at least one electrode assembly.

By arranging a plurality of electrode assemblies, the capacity of the battery cell can be effectively improved, and arranging the adapter to include a plurality of tab connecting parts can further increase the overcurrent area of the current flowing through the tab connecting parts, thereby reducing the transfer rate. The temperature rise during the working process of the joint.

In some embodiments, the tab connecting portion is symmetrically arranged with respect to the terminal connecting portion. This arrangement can improve the assembling convenience of the adapter during the battery cell assembling process.

In some embodiments, the terminal connecting portion is protruded from a surface of the tab connecting portion that faces away from the electrode body, and the adapter is provided with a concave portion at a position corresponding to the terminal connecting portion, and the concave portion faces the electrode relative to the tab connecting portion. The surface of the body is concave. This arrangement facilitates the connection of the adaptor to the electrode terminal, the first tab and the second tab.

In some embodiments, there are a plurality of first tabs, and the plurality of first tabs are arranged in layers; and/or, there are a plurality of second tabs, and a plurality of second tabs are arranged in layers. Such arrangement facilitates the connection of the first tab and the second tab to the first connection part and the second connection part respectively, and is beneficial to improve the compactness of the internal structure of the battery cell.

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

In a third aspect, an embodiment of the present application provides an electrical device, including the battery cell provided in any one of the foregoing embodiments, and the battery cell is used to provide electrical energy.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the drawings required in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the drawings without any creative effort.

1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

2 is a schematic diagram of an exploded structure of a battery provided by an embodiment of the present application;

3 is a schematic structural diagram of a battery module in a battery provided by an embodiment of the present application;

4 is a schematic diagram of an exploded structure of a battery cell provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of the adapter in the battery cell provided in FIG. 4;

6 is a schematic diagram of an exploded structure of a battery cell provided by another embodiment of the present application;

FIG. 7 is a schematic structural diagram of the adapter in the battery cell shown in FIG. 6;

FIG. 8 is a schematic top view of the battery cell shown in FIG. 6;

9 is a schematic cross-sectional view of the battery cell shown in FIG. 8 taken along line E-E;

10 is a schematic diagram of an exploded structure of a battery cell provided by another embodiment of the present application;

FIG. 11 is a schematic structural diagram of the adapter in the battery cell provided in FIG. 10;

FIG. 12 is a schematic top view of the battery cell shown in FIG. 10;

FIG. 13 is a stepped cross-sectional view of the battery cell shown in FIG. 12 taken along line C-C;

FIG. 14 is a partial enlarged view of D in FIG. 13 .

In the drawings, the drawings are not necessarily drawn to actual scale.

Description of reference numbers:

1. Vehicle; 1a, motor; 1b, controller;

10, battery; 11, box body; 111, bottom case; 112, top case;

20. Battery module;

30, battery cell; 31, shell; 32, end cap; 321, electrode terminal; 33, electrode assembly; 331, electrode body; 332, first tab; 333, second tab; 34, adapter 341, terminal connection part; 342, tab connection part; 342a, recessed part; 3421, first connection part; 3422, second connection part; 30a, first surface; 30b, second surface;

X, the first direction; Y, the second direction; Z, the third direction.

Detailed ways

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application by way of example, but should not be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present application. Application restrictions. Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance. "Vertical" is not strictly vertical, but within the allowable range of errors. "Parallel" is not strictly parallel, but within the allowable range of errors.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

In this application, the battery cells may include lithium-ion battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., which are not limited in the embodiments of the present application. The battery cell may be in the form of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which are not limited in the embodiments of the present application. The battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square-shaped battery cells, and soft-pack battery cells, which are not limited in the embodiments of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the batteries mentioned in this application may include battery modules or battery packs, and the like. Batteries typically include a case for enclosing one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes an electrode body and a tab protruding from the electrode body. The electrode body includes a first pole piece, a second pole piece and a separator. The battery cell mainly relies on the movement of metal ions between the first pole piece and the second pole piece to work. The first pole piece includes a first current collector and a first active material layer, the first active material layer is coated on the surface of the first current collector, and the current collector without the first active material layer protrudes from the coated first current collector. The current collector of the active material layer and the current collector not coated with the first active material layer can be used as a positive electrode tab after stacking. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate. The second pole piece includes a second current collector and a second active material layer, the second active material layer is coated on the surface of the second current collector, and the current collector without the second active material layer protrudes from the coated second current collector. The current collector of the active material layer and the current collector not coated with the second active material layer can be used as negative electrode tabs after stacking. The material of the negative electrode current collector can be copper, and the second active material can be carbon or silicon. The material of the diaphragm can be PP or PE, etc. In addition, the electrode assembly may be a wound structure or a laminated structure, and the embodiment of the present application is not limited thereto.

The development of battery technology needs to consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge-discharge rate, safety and other performance parameters.

After discovering that the battery cell has a serious heat generation problem near the tab during the high-rate charging process, the inventor has analyzed and studied the structure and use environment of the battery cell. The inventor found that the electrode body of the electrode assembly is usually provided with a tab, and the connection area between the adapter and the tab of the electrode assembly is small. During the charging process of the battery cell, especially for the battery cell charged at a high rate, the current flowing through the adapter is too large, and because the overcurrent area of the adapter is small, it is easy to cause a large temperature in the adapter. liters, which seriously affects the working safety of the battery cell.

Based on the above problems discovered by the inventor, the inventor has improved the structure of the battery cell. The technical solutions described in the embodiments of the present application are applicable to the battery cell, the battery including the battery cell, and the electrical device using the battery.

Electrical devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and power tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, spacecraft, etc.; electric toys include fixed Electric toys of type or mobile type, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembling electric tools and railway electric tools, such as, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment.

In the following embodiments, for the convenience of description, the electric device is a vehicle as an example for description.

As shown in FIG. 1 , a battery 10 is provided inside the vehicle 1 . The battery 10 may be provided at the bottom or the head or the rear of the vehicle 1 . The battery 10 can be used for power supply of the vehicle 1 , for example, the battery 10 can be used as an operation power source of the vehicle 1 .

The vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, for starting, navigating, and running the vehicle 1 for working power requirements.

In some embodiments of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1 , but can also be used as the driving power source of the vehicle 1 to provide driving power for the vehicle 1 instead of or partially instead of fuel or natural gas.

Referring to FIG. 2 , the battery 10 includes a battery cell (not shown in FIG. 2 ) and a case 11 for accommodating the battery cell. The case 11 may have various structures.

In some embodiments, the box body 11 includes a bottom case 111 and a top case 112 , and the bottom case 111 and the top case 112 cover each other. The bottom case 111 and the top case 112 together define an accommodation portion for accommodating the battery cells 30 . The bottom case 111 and the top case 112 may both be hollow structures with one side open. The opening side of the bottom case 111 is covered with the opening side of the top case 112 to form the box body 11 having the accommodating space. A sealing member may also be provided between the bottom case 111 and the top case 112 to achieve a sealed connection between the bottom case 111 and the top case 112 .

In practice, the bottom case 111 can cover the top of the top case 112 . The bottom case 111 may also be referred to as a lower case, and the top case 112 may also be referred to as an upper case.

The bottom case 111 and the top case 112 may have various shapes, for example, a cylinder, a rectangular parallelepiped, and the like. In FIG. 2 , by way of example, the bottom case 111 and the top case 112 are both rectangular parallelepiped structures.

In the battery 10 , there may be one battery cell or a plurality of battery cells. If there are a plurality of battery cells, the plurality of battery cells can be connected in series or in parallel or mixed. Mixed connection means that the plurality of battery cells 30 are both connected in series and in parallel. The plurality of battery cells 30 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells can be accommodated in the box 11, or the plurality of battery cells can be connected in series or in parallel or mixed first. The battery modules 20 are assembled together. A plurality of battery modules 20 are connected in series or in parallel or mixed to form a whole, and are accommodated in the box 11 .

In some embodiments, as shown in FIG. 3 , in the battery, there are a plurality of battery cells 30 . A plurality of battery cells 30 are first connected in series or in parallel or mixed to form a battery module 20 . A plurality of battery modules 20 are connected in series or in parallel or mixed to form a whole, and are accommodated in the box 11 .

In some embodiments, the plurality of battery cells 30 in the battery module 20 may be electrically connected through a bus component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells 30 in the battery module 20 .

FIG. 4 is a schematic diagram of an exploded structure of a battery cell 30 provided by some embodiments of the present application. The battery cell 30 refers to the smallest unit constituting the battery. As shown in FIG. 4 , the battery cell 30 includes an end cap 32 , a casing 31 and an electrode assembly 33 .

The end cap 32 refers to a component that covers the opening of the casing 31 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 32 may be adapted to the shape of the housing 31 to fit the housing 31 . Optionally, the end cover 32 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 32 is not easily deformed when it is squeezed and collided, so that the battery cell 30 can have a higher strength. Structural strength and safety performance can also be improved. Functional components such as electrode terminals 321 may be provided on the end cap 32 . The electrode terminals 321 may be used for electrical connection with the electrode assemblies 33 for outputting or inputting electrical energy of the battery cells 30 .

In some embodiments, the end cap 32 may also be provided with a pressure relief mechanism for releasing the inner pressure when the inner pressure or temperature of the battery cell 30 reaches a threshold value. The material of the end cap 32 may also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, an insulating member may also be provided on the inner side of the end cap 32, and the insulating member may be used to isolate the electrical connection components in the housing 31 from the end cap 32, so as to reduce the risk of short circuit. Illustratively, the insulating member may be plastic, rubber, or the like.

The housing 31 is an assembly for mating with the end caps 32 to form the internal environment of the battery cells 30, wherein the formed internal environment can be used to accommodate the electrode assembly 33, electrolyte (not shown in the figure) and other components. The casing 31 and the end cap 32 may be independent components, and an opening may be provided on the casing 31 , and the end cap 32 can cover the opening at the opening to form the internal environment of the battery cell 30 . Without limitation, the end cap 32 and the casing 31 can also be integrated. Specifically, the end cap 32 and the casing 31 can form a common connection surface before other components are put into the casing. When it is necessary to encapsulate the interior of the casing 31 At this time, the end cap 32 is closed to the casing 31 again. The housing 31 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal, and the like. Specifically, the shape of the casing 31 can be determined according to the specific shape and size of the electrode assembly 33 . The material of the housing 31 may be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 33 is a part in which an electrochemical reaction occurs in the battery cell 30 . One or more electrode assemblies 33 may be contained within the housing 31 . The electrode assembly 33 includes an electrode body 331 and tabs protruding from the electrode body 331 . The electrode body 331 includes a first pole piece, a second pole piece, and a spacer. The polarities of the first pole piece and the second pole piece are opposite, and the spacer is used for insulating and isolating the first pole piece and the second pole piece. The first pole piece, the second pole piece and the separator can be formed by winding, or can be formed by stacking them. The first pole piece includes a first coating area coated with a first active material layer, and the second pole piece includes a second coating area coated with a second active material layer. The positive electrode tab and the negative electrode tab can be located at one end of the main body portion together or at both ends of the main body portion respectively. During the charging and discharging process of the battery, the first active material and the second active material react with the electrolyte, and the tabs are connected to the electrode terminals 321 to form a current loop.

According to the battery cell 30 provided by the embodiment of the present application, as shown in FIG. 4 , the battery cell 30 includes a casing 31 , an electrode assembly 33 and an adapter 34 . The electrode assembly 33 is accommodated in the housing 31 , and the electrode assembly 33 includes an electrode body 331 and a first tab 332 and a second tab 333 protruding from the electrode body 331 . The first tab 332 and the second tab 333 are polar same. The adapter 34 includes a terminal connection part 341 and a tab connection part 342 . The terminal connection part 341 is used for connecting with the electrode terminal 321 of the battery cell 30, the tab connection part 342 includes a first connection part 3421 and a second connection part 3422, and the first connection part 3421 and the second connection part 3422 are respectively connected to the first connection part 3421 and the second connection part 3422. A pole lug 332 and a second pole lug 333 .

The adapter 34 may be in a sheet shape, or in other shapes such as a strip shape or a block shape, as long as the first tab 332 and the second tab 333 can be electrically connected to the electrode terminal 321 at the same time.

Specifically, one electrode assembly 33 is set to include a first tab 332 and a second tab 333, and the two polarities are the same, that is, one electrode assembly 33 is configured to include at least two positive tabs, or at least two negative tabs, or both At least two positive tabs and at least two negative tabs are included.

Correspondingly, the adapter 34 is connected to the first tab 332 and the second tab 333 at the same time, that is, one adapter 34 is provided to simultaneously connect at least two tabs with the same polarity of one electrode assembly 33 . One adapter 34 can be set to connect at least two positive tabs of one electrode assembly 33 at the same time, one adapter 34 can be set to be connected to at least two negative tabs of one electrode assembly 33 at the same time, or two adapters 34 can be set to be respectively At least two positive tabs and at least two negative tabs of one electrode assembly 33 are connected.

The battery cell 30 may include one electrode assembly 33 , or may include a plurality of electrode assemblies 33 . In the embodiment where the battery cell 30 includes one electrode assembly 33 , an adapter 34 may be provided to connect the first tab 332 and the second tab 333 of one electrode assembly 33 . In the embodiment in which the battery cell 30 includes a plurality of electrode assemblies 33, one adapter 34 may be provided to connect the first tabs 332 and the second tabs 333 of the plurality of electrode assemblies 33 at the same time, or a plurality of adapters may be provided The pieces 34 are respectively connected to the first tabs 332 and the second tabs 333 of a part of the electrode assemblies 33 of the plurality of electrode assemblies 33 .

The specific positions of the first tab 332 and the second tab 333 on the electrode assembly 33 and the relative relationship between the two can be specifically set according to the internal structure of the battery cell 30 and the spatial layout of each component, and according to The shape and positional relationship of the first tab 332 and the second tab 333 are set to a suitable shape and structure of the adaptor 34 , so that the adaptor 34 can connect the first tab 332 and the second tab 333 at the same time.

It can be understood that the shape of the adapter 34 and the corresponding first connection portion 3421 and the second connection portion can be set according to the arrangement positions of the first tab 332 , the second tab 333 and the corresponding electrode terminal 321 . The relative position of 3422 and the position of the two relative to the terminal connecting portion 341 respectively. Therefore, the positions of the first tabs 332 , the second tabs 333 , and the electrode terminals 321 and the corresponding structural types of the adapters 34 can be reasonably set according to the layout of the battery cells 30 .

Since the first connecting portion 3421 and the second connecting portion 3422 of the adapter 34 are respectively connected to the first tab 332 and the second tab 333 of the electrode assembly 33 , the poles between the adapter 34 and the electrode assembly 33 can be increased. The connection area of the ear. In this way, during the cyclic operation of the battery cell 30 , the current flowing through the adapter 34 is divided into two paths, which flow to the first connecting portion 3421 and the second connecting portion 3422 respectively, which increases the overcurrent of the adapter 34 . The area is reduced, the current density flowing through the adapter 34 is reduced, and the temperature rise of the adapter 34 per unit time can be effectively reduced.

In the battery cell 30 provided in the embodiment of the present application, the electrode assembly 33 is provided with the first tab 332 and the second tab 333 with the same polarity, and the first connection portion 3421 and the second connection of the adapter 34 are arranged The parts 3422 are respectively connected to the first tab 332 and the second tab 333 of an electrode assembly 33, which can effectively increase the overcurrent area of the adapter 34 and improve the overcurrent capability, so that during the cycle of the battery cell 30 , especially in the process of high-rate charging, the temperature rise rate of the adapter 34 can be effectively reduced, and the work safety of the battery cell 30 can be improved.

In some embodiments, the first tab 332 and the second tab 333 protrude out of the electrode body 331 along the first direction X, and the battery cell 30 further includes two first surfaces 30a and The two second surfaces 30b oppositely arranged along the third direction Z, the area of the first surface 30a is larger than the area of the second surface 30b, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

Specifically, the first tab 332 and the second tab 333 may protrude from the electrode body 331 along one side of the first direction X, and at this time, the battery cell may be provided with an end cap 32 . The first tab 332 and the second tab 333 may also protrude from the electrode body 331 on both sides along the first direction X. At this time, the battery cell includes two end caps 32, which are respectively covered on the edge of the casing 31. both ends in the first direction.

The first connecting portion 3421 and the second connecting portion 3422 of the adapter 34 may be distributed on both sides of the terminal connecting portion 341 along the second direction Y, or may be distributed on both sides of the terminal connecting portion 341 along the third direction Z. The extending direction of the first tab 332 and the extending direction of the second tab 333 are specifically set. The positional relationship between the first connecting portion 3421 , the second connecting portion 3422 and the terminal connecting portion 341 may be arranged in a straight line, or may not be connected by a broken line, which is not limited here.

In some embodiments, as shown in FIGS. 4 and 5 , the first tabs 332 and the second tabs 333 are arranged along the second direction Y, and the first connection parts 3421 and the second connection parts 3422 are distributed on the terminal connection part 341 Both sides along the second direction Y. In this way, when the current flows to the adapter 34, it flows through the terminal connecting portion 341 and then flows to the first connecting portion 3421 and the second connecting portion 3422 along the two sides of the terminal connecting portion 341 along the second direction Y, respectively, or along the opposite path. The first connection portion 3421 and the second connection portion 3422 flow toward the terminal connection portion 341 . With this arrangement, the adapter 34 can also be connected to the first tab 332 and the second tab 333 , thereby increasing the flow area of the adapter 34 and reducing the temperature rise rate of the adapter 34 .

In other embodiments, as shown in FIG. 6 to FIG. 9 , the first tabs 332 and the second tabs 333 are arranged at intervals along the third direction Z, and the first connection portion 3421 and the second connection portion 3422 are respectively located in the terminal connection Both sides of the portion 341 along the third direction Z. In this way, when the current flows to the adapter 34, it flows through the terminal connecting portion 341 and then flows to the first connecting portion 3421 and the second connecting portion 3422 along the two sides of the terminal connecting portion 341 along the third direction Z, respectively, or along the opposite path. The first connection portion 3421 and the second connection portion 3422 flow toward the terminal connection portion 341 . With this arrangement, the adapter 34 can also be connected to the first tab 332 and the second tab 333 , thereby increasing the flow area of the adapter 34 and reducing the temperature rise rate of the adapter 34 . In addition, arranging the first tabs 332 and the second tabs 333 along the third direction Z, and setting the terminal connecting portion 341 between the first tabs 332 and the second tabs 333, is also convenient for the battery cells 30 The spatial arrangement of each structure.

In the embodiment in which the first tabs 332 and the second tabs 333 are arranged at intervals along the third direction Z, the separation distance between the first tabs 332 and the second tabs 333 is not limited, as long as they can be connected to the first connecting portion respectively. The connection between 3421 and the second connecting part 3422 is sufficient.

In some embodiments, the distance between the first tab 332 and the second tab 333 along the third direction Z is greater than or equal to 7 mm. This arrangement facilitates the smooth processing of the first tab 332 and the second tab 333 , and can also effectively reduce the risk of conductive connection between the two during operation, thereby reducing the risk of shunt failure of the adapter 34 .

In some embodiments, the two positive tabs and the two negative tabs of the electrode assembly 33 are spaced apart along the third direction Z. Since the size of the electrode assembly 33 extending along the third direction Z is larger than the size extending along the second direction Y, arranging the positive electrode tabs and the negative electrode tabs along the third direction Z is convenient to increase the distance between the positive electrode tabs and the negative electrode tabs, and effectively It reduces the risk of short circuit between the positive and negative lugs.

It can be understood that, the number of electrode assemblies 33 may be one or more, which is not limited here. In the embodiment in which the number of electrode assemblies 33 is one, the first connecting portion 3421 and the second connecting portion 3422 of the adapter 34 are respectively connected to the first tab 332 and the second tab 333 of one electrode assembly 33 . In the embodiment in which the number of the electrode assemblies 33 is multiple, the adapter 34 may be configured to include a plurality of tab connecting parts 342 , and each tab connecting part 342 is respectively connected to the first tab 332 and the second tab of one electrode assembly 33 . Diode lugs 333. The first connecting portion 3421 and the second connecting portion 3422 of the adapter 34 may also be provided to connect the first tabs 332 and the second tabs 333 of the plurality of electrode assemblies 33 respectively.

In some embodiments, as shown in FIGS. 10 to 14 , the electrode assemblies 33 are arranged in multiples, and the plurality of electrode assemblies 33 are arranged side by side along the second direction Y. The adapter 34 includes a plurality of tab connecting portions 342 , the plurality of tab connecting portions 342 are arranged along the second direction Y, and one tab connecting portion 342 is connected to at least one electrode assembly 33 .

The plurality of electrode assemblies 33 are arranged side by side along the second direction Y, that is, the first surfaces 30a of adjacent two electrode assemblies 33 of the plurality of electrode assemblies 33 are arranged adjacent to each other. The first tabs 332 and the second tabs 333 of the plurality of electrode assemblies 33 may be arranged along the second direction Y, and may also be arranged along the third direction Z, or a part of the first tabs 332 and the second tabs 333 may be arranged along the third direction. Two directions Y are arranged, and another part of the first tabs 332 and the second tabs 333 are arranged along the third direction Z.

In the embodiment in which the first tabs 332 and the second tabs 333 of the plurality of electrode assemblies 33 are arranged along the second direction Y, the first connection parts 3421 and the second connection parts 3422 of the plurality of tab connection parts 342 are disposed at On both sides of the terminal connecting portion 341 along the second direction Y, each tab connecting portion 342 is connected to one electrode assembly 33 , and the number of the tab connecting portions 342 and the number of the electrode assemblies 33 may be the same.

In the embodiment in which the first tabs 332 and the second tabs 333 of the plurality of electrode assemblies 33 are arranged along the third direction Z, the first connection portion 3421 and the second connection portion 3422 of the plurality of tab connection portions 342 are connected to Both ends of the terminal connecting portion 341 along the third direction Z, at this time, the numbers of the tab connecting portions 342 and the electrode assemblies 33 may be the same or different. Exemplarily, the adapter 34 may be provided with two tab connecting parts 342 , one tab connecting part 342 is connected to a part of the electrode assembly 33 , and the other tab connecting part 342 is connected to another part of the electrode assembly 33 . When the number of the electrode assemblies 33 is three or more, more than three tab connecting parts 342 may also be provided, and each tab connecting part 342 is respectively connected to the first pole of a part of the electrode assemblies 33 among the three or more electrode assemblies 33 . lug 332 and second pole lug 333 .

By arranging a plurality of electrode assemblies 33 , the capacity of the battery cells 30 can be effectively improved, and arranging the adapter 34 to include a plurality of tab connecting parts 342 can further increase the overcurrent of the current flowing through the tab connecting parts 342 area, thereby reducing the temperature rise of the adapter 34 during operation.

It can be understood that, the extension lengths of the first connecting portion 3421 and the second connecting portion 3422 of the tab connecting portion 342 may be the same or different. In the embodiment in which the extension length of the first connecting portion 3421 and the second connecting portion 3422 are the same, they can be arranged symmetrically or asymmetrically with respect to the center plane of the terminal connecting portion 341 , which is not limited here.

In some embodiments, the tab connecting parts 342 are symmetrically arranged with respect to the terminal connecting parts 341 .

It can be understood that, the tab connecting portion 342 may be symmetrically disposed with respect to the center plane of the terminal connecting portion 341 , the terminal connecting portion 341 may have multiple center planes, and the tab connecting portion 342 may be disposed about any center plane of the terminal connecting portion 341 . Symmetrical arrangement, for example, the tab connecting portion 342 is symmetrically arranged with respect to the center plane of the terminal connecting portion 341 perpendicular to the second direction Y, or, the tab connecting portion 342 is disposed relative to the terminal connecting portion 341 perpendicular to the third direction Z. Center plane symmetry setting.

The tab connecting portion 342 is arranged symmetrically with respect to the center plane of the terminal connecting portion 341 , that is, the first connecting portion 3421 and the second connecting portion 3422 are arranged symmetrically with respect to the center plane of the terminal connecting portion 341 . In this way, in the process of assembling the battery cell 30 , it is only necessary to adjust the posture of the adapter 34 on the battery cell 30 , and it is not necessary to specially make the first connection portion 3421 and the second connection portion 3422 of the adapter 34 . Corresponding to corresponding positions, that is, the adapter 34 can still be used normally after a half-turn rotation, which can reduce the difficulty of assembling the battery cells 30 .

The structure of the terminal connection portion 341 is not limited, as long as the connection with the electrode terminal 321 can be realized.

In some embodiments, the terminal connecting portion 341 is protruded from the surface of the tab connecting portion 342 away from the electrode body 331 , and the adapter 34 is provided with a concave portion 342 a at a position corresponding to the terminal connecting portion 341 , and the concave portion 342 a is opposite to the tab. The surface of the connection portion 342 facing the electrode body 331 is recessed.

It can be understood that there is a certain interval between the electrode terminals 321 and the tabs of the battery cell 30 along the first direction X, and the terminal connecting portion 341 is arranged to protrude on the surface of the tab connecting portion 342 away from the electrode body 331 to facilitate the terminal connection. Connection between the connection portion 341 and the electrode terminal 321 . The concave portion 342a is provided at the position corresponding to the connection between the tab connecting portion 342 and the terminal, and the concave portion 342a is concave relative to the surface of the tab connecting portion 342 facing the electrode body 331, so that the tab connecting portion 342 is connected to the first tab 332 and the electrode body 331. The second tab 333 .

The battery cell 30 may be provided with one first tab 332, or may be provided with multiple first tabs 332. When there are multiple first tabs 332, the plurality of first tabs 332 may be partially stacked, or all of the first tabs 332 may be provided. A tab 332 is arranged in layers.

In some embodiments, there are multiple first tabs 332, and the multiple first tabs 332 are stacked. In this way, the plurality of first tabs 332 are simultaneously connected to one first connecting portion 3421 , which facilitates the connection between the electrode assembly 33 and the adapter 34 and makes the internal structure of the battery cell 30 more compact.

Similarly, the battery cell 30 may be provided with one second tab 333, or may be provided with multiple second tabs 333. When there are multiple second tabs 333, the plurality of second tabs 333 may be partially stacked separately. All of the second tabs 333 may also be stacked.

In some embodiments, there are multiple second tabs 333 , and the multiple second tabs 333 are stacked. In this way, after the plurality of second tabs 333 are stacked, one second connecting portion 3422 is connected at the same time, which facilitates the connection between the electrode assembly 33 and the adapter 34 and makes the structure of the battery cell 30 more compact.

In other embodiments, there are a plurality of first tabs 332 , a plurality of first tabs 332 are arranged in layers, a plurality of second tabs 333 are arranged in layers, and a plurality of second tabs 333 are arranged in layers. In this way, the convenience of connecting the electrode assembly 33 and the adapter 34 is further improved, and the compactness of the internal structure of the battery cell 30 is further improved.

According to some embodiments of the present application, the embodiments of the present application further provide a battery, including the battery cell 30 provided by any one of the foregoing embodiments.

Since the battery provided by the embodiment of the present application adopts the battery cell 30 provided by any of the above-mentioned embodiments, it has the same technical effect, which will not be repeated here.

According to some embodiments of the present application, the embodiments of the present application further provide an electrical device, including the battery cells 30 provided by any one of the foregoing embodiments, and the battery cells 30 are used to provide electrical energy.

The electrical device provided by the embodiment of the present application has the same technical effect because the battery cell 30 provided by any of the above-mentioned embodiments is used, and details are not described herein again.

Although the application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the application, particularly, provided that no structural conflict exists , each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. A battery cell, comprising:

a housing;

the electrode assembly is accommodated in the shell and comprises an electrode body and a first lug and a second lug which protrude out of the electrode body, and the first lug and the second lug have the same polarity;

the adaptor comprises a terminal connecting part and a tab connecting part, wherein the terminal connecting part is used for being connected with the electrode terminal of the battery monomer, the tab connecting part comprises a first connecting part and a second connecting part, and the first connecting part and the second connecting part are respectively connected with the first tab and the second tab.

2. The battery cell as recited in claim 1, wherein the first tab and the second tab protrude from the electrode body along a first direction, the battery cell further comprises two first surfaces oppositely disposed along a second direction and two second surfaces oppositely disposed along a third direction, the area of the first surfaces is larger than that of the second surfaces, and the first direction, the second direction and the third direction are perpendicular to each other;

the first tab and the second tab are arranged along the second direction, and the first connecting portion and the second connecting portion are arranged at intervals along the second direction.

3. The battery cell as recited in claim 1, wherein the first tab and the second tab protrude from the electrode body along a first direction, the battery cell further comprises a first surface disposed opposite to each other along a second direction and a second surface disposed opposite to each other along a third direction, the area of the first surface is larger than that of the second surface, and the first direction, the second direction and the third direction are perpendicular to each other;

the first lug and the second lug are arranged at intervals along the third direction, and the first connecting part and the second connecting part are respectively positioned at two sides of the terminal connecting part along the third direction.

4. The battery cell as recited in claim 3, wherein the first tab and the second tab are spaced apart by greater than or equal to 7mm in the third direction.

5. The battery cell according to any one of claims 2 to 4,

the electrode assemblies are arranged in a plurality, and the electrode assemblies are arranged side by side along the second direction;

the adaptor comprises a plurality of tab connection parts, the tab connection parts are arranged along the second direction, and one tab connection part is connected with at least one electrode assembly.

6. The battery cell as recited in claim 1, wherein the tab connection part is disposed symmetrically with respect to the terminal connection part.

7. The battery cell according to any one of claims 1 to 4, wherein the terminal connection part is provided protruding from a surface of the tab connection part facing away from the electrode body, and the adaptor is provided with a recess at a position corresponding to the terminal connection part, the recess being recessed with respect to a surface of the tab connection part facing the electrode body.

8. The battery cell as recited in any one of claims 1-4, wherein the first tab is a plurality of tabs, the plurality of tabs being stacked; and/or the presence of a gas in the gas,

the second electrode lug is multiple, and the second electrode lugs are arranged in a stacked mode.

9. A battery comprising the battery cell of any one of claims 1 to 8.

10. An electric device comprising a cell according to any one of claims 1 to 8 for providing electric energy.

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