CN223206425U - Battery monomer, electric connecting piece, battery device, power utilization device and energy storage device - Google Patents

Abstract

The application discloses a battery monomer, an electric connecting piece, a battery device, an electric device and an energy storage device. The battery cell includes a case, an electrode assembly, an electrode terminal, and an electrical connection member. The electrode assembly is located in the accommodating cavity of the shell and comprises an electrode main body and a tab connected with the electrode main body, and the thickness direction of the electrode main body is a first direction. The electrode terminal is inserted into a mounting hole formed in the first wall of the case. The electric connecting piece comprises a tab connecting part, an electrode terminal connecting part and an intermediate connecting part, wherein the tab connecting part is connected with the electrode tab, the electrode terminal connecting part is connected with the electrode terminal, the intermediate connecting part is connected with the tab connecting part and the electrode terminal connecting part, and the tab connecting part and the electrode terminal connecting part are positioned on two opposite sides of the intermediate connecting part along the second direction. At least one side of the tab connection part along the first direction is provided with an accommodating space, and at least part of the tab is accommodated in the accommodating space. The battery monomer of the embodiment of the application has high energy density.

Description

Battery monomer, electric connecting piece, battery device, power utilization device and energy storage device

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, an electric connecting piece, a battery device, an electric device and an energy storage device.

Background

New energy batteries are increasingly used in life and industry, for example, new energy automobiles equipped with battery devices have been widely used, and in addition, battery devices are increasingly used in the field of energy storage and the like.

With the development of battery technology, how to increase the energy density of a battery cell is one of the subjects of research in the industry.

Disclosure of utility model

In order to solve the technical problems, the application provides a battery cell with high energy density, an electric connecting piece, a battery device, an electric device and an energy storage device.

The application is realized by the following technical scheme.

The first aspect of the application provides a battery unit, which comprises a shell, an electrode assembly, an electrode terminal and an electric connecting piece, wherein a containing cavity is formed in the shell, the shell comprises a first wall, a mounting hole is formed in the first wall, the electrode assembly is located in the containing cavity and comprises an electrode main body and a tab connected with the electrode main body, the thickness direction of the electrode main body is a first direction, the electrode terminal penetrates through the mounting hole, the electric connecting piece comprises a tab connecting part, an electrode terminal connecting part and an intermediate connecting part, the tab connecting part is connected with the tab, the electrode terminal connecting part is connected with the electrode terminal, the intermediate connecting part is connected with the tab connecting part and the electrode terminal connecting part, the tab connecting part and the electrode terminal connecting part are located on two opposite sides of the intermediate connecting part along a second direction, and the second direction is perpendicular to the first direction, and at least one side of the tab connecting part along the first direction is provided with a containing space, and at least part of the tab is contained in the containing space.

Because the tab connecting portion of the electric connecting piece has accommodation space along at least one side of the first direction, and at least part of tab is accommodated in the accommodation space, thereby, the accommodation space of the electric connecting piece along the side of the first direction can be fully utilized, the occupied space of the tab in the height direction (the third direction) is reduced, the tab is not wholly positioned below the electric connecting piece, thereby being beneficial to improving the space utilization rate in the shell of the battery, reserving larger space for the electrode main body, and further properly increasing the volume of the electrode main body and improving the energy density of the battery while not changing the shell size of the battery.

In some embodiments, the tab connection portion includes a first surface and a second surface opposite to each other along a third direction, the first surface faces the first wall, the second surface faces away from the first wall, the tab includes a welded portion and a bending portion, the welded portion is connected with the bending portion, the welded portion is welded with the second surface of the tab connection portion, the bending portion protrudes toward the side where the first wall is located along the third direction relative to the welded portion, the bending portion is accommodated in the accommodating space, and the third direction is perpendicular to both the first direction and the second direction.

From this, can be through the mode of buckling of change utmost point ear for the structure of utmost point ear is compacter, and whole along the size of third direction is littleer, thereby makes utmost point ear occupation space littleer, practices thrift the space in holding the intracavity of casing, and then makes the space that holds the intracavity and be used for holding the electrode main part increase, is favorable to improving the free energy density of battery. And the bending part of the lug is accommodated in the accommodating space, so that the lateral space of the lug connecting part can be fully utilized, the space in the accommodating cavity of the shell is further saved, and the improvement of the energy density of the battery cell is facilitated.

In some embodiments, a difference between a first dimension and a second dimension along the third direction is greater than or equal to 0mm and less than or equal to 3mm, wherein the first dimension is a distance dimension between a top surface of the bend and the first wall, and the second dimension is a distance dimension between the first surface of the tab connection and the first wall.

Therefore, along the third direction, the top surface of the bending part is flush with the first surface of the tab connecting part or slightly higher than the first surface of the tab connecting part, so that the area of the accommodating space along the height direction can be fully utilized to accommodate the tabs more, thereby providing a larger space for the electrode main body and increasing the energy density of the battery cell.

In some embodiments, at least a portion of the tab connection portion is recessed along the first direction to form a recessed portion that defines at least a portion of the receiving space.

Therefore, the groove part formed by the tab connecting part can form an accommodating space for accommodating at least part of the bending part of the tab, so that the energy density of the battery cell can be increased without changing the size of the shell of the battery cell.

In some embodiments, the battery cell further includes an insulating member at a side of the first wall facing the electrode assembly, and the bent portion has a width smaller than a distance dimension between a bottom wall of the groove portion and an outer edge of the insulating member in the first direction.

Therefore, the shape of the tab can be guaranteed to be good, and the bending part of the tab can be contained in the containing space, so that the space occupied by the tab in the containing cavity along the third direction is saved.

In some embodiments, the distance between the bottom wall of the groove and the outer edge of the insulator is greater than or equal to a third dimension along the first direction, wherein the third dimension is the sum of the distance between the housing and the insulator along the first direction and half the width of the tab connection along the first direction.

Thereby, the accommodating space can have a sufficient space to accommodate the bent portion of the tab.

In some embodiments, a distance dimension between a bottom wall of the groove portion and an outer edge of the insulator is less than or equal to a fourth dimension, wherein the fourth dimension is one half of a thickness of the battery cell in the first direction minus the third dimension.

Therefore, the tab connection part can meet the overcurrent requirement of the tab connection part and the welding requirement of the welding part of the tab while forming the groove part.

In some embodiments, the width of the groove portion is less than or equal to half the width of the electrical connector along the first direction.

Therefore, the tab can be well welded with the tab connecting part without excessive elongation, the possibility of tab redundancy is reduced, and the production cost is effectively reduced.

In some embodiments, the width of the groove portion is greater than or equal to a fifth dimension along the first direction, wherein the fifth dimension is a distance dimension along the first direction between a bottom of the groove portion and the housing minus a distance dimension along the first direction between the electrical connector and the housing.

Therefore, at least one side of the tab connection part along the first direction has enough space to form an accommodating space for accommodating the bending part of the tab, thereby being beneficial to improving the energy density of the battery cell.

In some embodiments, the length of the groove portion is less than or equal to the length of the electrical connection member and greater than or equal to the length of the tab plus an error dimension along the second direction.

Therefore, the groove part can better accommodate the bending part of the lug along the length direction, the possibility that the groove side wall of the groove part interferes with the bending part is reduced, and the reliability of the battery cell is improved.

In some embodiments, the electrode terminal connection portion and the tab connection portion extend in the second direction, the intermediate connection portion extends in a third direction, the tab connection portion is closer to the first wall than the motor terminal connection portion in the third direction, and the third direction is perpendicular to both the first direction and the second direction.

Therefore, the space of the first wall facing the accommodating cavity side can be fully utilized, the size of the tab along the third direction is further saved, a larger space is reserved for the electrode main body, and the energy density of the battery cell is improved.

In some embodiments, the number of the groove parts is two, the two groove parts are positioned on two opposite sides of the tab connection part along the first direction, and the shape and the size of the two groove parts are the same or different.

Thus, the shape and the size of the groove portion can be set according to the lead-out shape and the size of the actual tab, thereby adapting to different tab forms.

In some embodiments, the tab connection portion is flat, and/or the electrode terminal connection portion is flat.

Thereby being more beneficial to the connection of the electrode terminal and the electrode lug with the electrode terminal connecting part and the electrode lug connecting part respectively, leading the reliability of the electric connecting piece to be better,

In some embodiments, the electrode terminals include a positive electrode terminal and a negative electrode terminal, the electrical connectors include a first electrical connector and a second electrical connector, the tab includes a positive electrode tab and a negative electrode tab, the positive electrode tab is on the same side as the positive electrode terminal and/or the negative electrode tab is on the same side as the negative electrode terminal, the positive electrode tab is connected to the positive electrode terminal through the first electrical connector, and the negative electrode tab is connected to the negative electrode terminal through the second electrical connector.

From this, at least some anodal utmost point ear can hold in the accommodation space that first electric connection spare was along at least one side that first direction had to at least some negative pole utmost point ear can hold in the accommodation space that second electric connection spare was along at least one side that first direction had, thereby can reduce the size of anodal utmost point ear and negative pole utmost point ear along the third direction, reserve bigger space for the electrode main part in holding the intracavity, be favorable to improving the energy density of battery monomer.

In addition, because the positive electrode tab and the positive electrode terminal are positioned at the same end, and/or the negative electrode tab and the negative electrode terminal are positioned at the same end, the connection of the tab and the electrode terminal is more convenient, the space in the shell of the battery cell can be saved, and the energy density of the battery cell can be improved.

In some embodiments, the electrode terminals include a positive electrode terminal and a negative electrode terminal, the electrical connectors include a first electrical connector and a second electrical connector, the tab includes a positive electrode tab and a negative electrode tab, the positive electrode tab is on a different side than the positive electrode terminal and/or the negative electrode tab is on a different side than the negative electrode terminal, the positive electrode tab is connected to the positive electrode terminal through the first electrical connector, and the negative electrode tab is connected to the negative electrode terminal through the second electrical connector.

From this, at least some anodal utmost point ear can hold in the accommodation space that first electric connection spare was along at least one side that first direction had to at least some negative pole utmost point ear can hold in the accommodation space that second electric connection spare was along at least one side that first direction had, thereby can reduce the size of anodal utmost point ear and negative pole utmost point ear along the third direction, reserve bigger space for the electrode main part in holding the intracavity, be favorable to improving the energy density of battery monomer.

In addition, the positive electrode tab and the positive electrode terminal are positioned on different sides, and/or the negative electrode tab and the negative electrode terminal are positioned on different sides, so that the flexibility of connection between the tab and the electrode terminal is improved, and the connection flexibility between the battery cells is improved when a plurality of battery cells are grouped.

In some embodiments, the electrode assemblies are plural in number, the plural electrode assemblies are arranged side by side along the first direction, and the tabs of the plural electrode assemblies having the same polarity are connected by the same electrical connector.

Therefore, the assembly steps can be reduced, the assembly difficulty is reduced, and the production cost is reduced.

The second aspect of the application provides an electric connector for a battery cell, wherein the thickness direction of the battery cell is a first direction, the electric connector comprises a tab connecting part, an electrode terminal connecting part and an intermediate connecting part, the tab connecting part is used for being connected with an electrode terminal of the battery cell, the electrode terminal connecting part is connected with the electrode terminal connecting part, the tab connecting part and the electrode terminal connecting part are positioned on two opposite sides of the intermediate connecting part along the second direction, the second direction is perpendicular to the first direction, and at least one side of the tab connecting part along the first direction is provided with an accommodating space for accommodating at least part of the tabs.

Because the tab connecting portion of the electric connecting piece has accommodation space along at least one side of the first direction, and the accommodation space can accommodate at least part of tabs, thereby, the accommodation space of the electric connecting piece along the side of the first direction can be fully utilized, the space occupied by the tabs in the height direction (the third direction) is reduced, the tabs are not wholly positioned below the electric connecting piece, thereby being beneficial to improving the space utilization rate in the shell of the battery, reserving larger space for the electrode main body, properly increasing the volume of the electrode main body while not changing the shell size of the battery, and improving the energy density of the battery, thereby being capable of improving the energy density of the battery.

A third aspect of the present application provides a battery device comprising a case, and at least one battery cell according to the first aspect of the present application, the battery cell being accommodated in the case.

The battery device provided by the application comprises the battery cell provided by the first aspect, so that the space occupied by the tab along the third direction can be reduced, the space occupied by the electrode main body can be increased, and the energy density of the battery cell can be improved.

A fourth aspect of the application provides an electrical consumer comprising a battery cell according to the first aspect of the application or a battery device according to the third aspect of the application for providing electrical energy.

The power utilization device according to the embodiment of the application, due to the inclusion of the battery cell provided in the first aspect or the battery device provided in the third aspect, can reduce the space occupied by the tab of the battery cell along the third direction, thereby increasing the space occupied by the electrode body, and facilitating the increase of the energy density of the battery cell, so that the energy density of the battery device can be increased, and the power supply time of the battery cell or the battery device to the power utilization device can be prolonged.

A fifth aspect of the application provides an energy storage device comprising a battery cell according to the first aspect of the application or a battery device according to the third aspect of the application for providing electrical energy.

The energy storage device according to the embodiment of the application, due to the inclusion of the battery cell provided in the first aspect or the battery device provided in the third aspect, can reduce the space occupied by the tab of the battery cell along the third direction, thereby increasing the space occupied by the electrode body, and being beneficial to improving the energy density of the battery cell, so that the energy density of the battery device can be improved, and the power supply time of the battery cell or the battery device to the energy storage device can be prolonged.

Effects of the utility model

According to the application, the space occupied by the electrode main body of the electrode assembly in the accommodating cavity of the shell can be increased, so that the energy density of the battery cell can be effectively improved.

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 an exploded perspective view of a battery device according to some embodiments of the present application;

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

fig. 4 is a schematic cross-sectional view of a battery cell provided by some embodiments of the application;

fig. 5 is an enlarged view of a portion a circled in fig. 4;

Fig. 6 is a schematic perspective view of an electrical connector according to some embodiments of the present application;

FIG. 7 is a schematic plan view of an electrical connector according to some embodiments of the present application;

FIG. 8 is a schematic view of another planar structure of an electrical connector according to some embodiments of the present application;

Fig. 9 is a schematic view of a partial planar structure of a positive electrode sheet, a negative electrode sheet, and a separator of an electrode body according to some embodiments of the present application.

Description of the reference numerals

1-Case, 1 a-housing cavity, 11-first wall, 12-sealed pouch, 2-electrode assembly, 21-electrode body, 211-positive tab, 212-negative tab, 213-separator, 22-tab, 221-positive tab, 222-negative tab, 223-welded portion, 224-bent portion, 3-electrode terminal, 31-positive terminal, 32-negative terminal, 4-electrical connector, 41-tab connector, 411-first surface, 412-second surface, 413-groove portion, 4131-groove bottom wall, 42-electrode terminal connector, 43-intermediate connector, 44-first electrical connector, 45-second electrical connector, 5-insulator, 10-housing space, 100-battery cell, 200-controller, 300-motor, 400-battery device, 401-case, 401 a-cover, 401 b-base plate, 1000-vehicle.

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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions.

In the description of embodiments of the present application, the technical terms "first," "second," "third," etc. are used merely to distinguish between different objects and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

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

In the description of the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, while a and B exist together, and B exists alone. In this context, the character "/" generally indicates that the associated object is an "or" relationship.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. are orientation or positional relationship based on the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, and are not intended to indicate or imply that the apparatus or element in question must have a specific orientation, be constructed, operated, or used in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.

In describing embodiments of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured" and other terms such as "fixed" are to be construed broadly as referring to either a fixed connection, a removable connection, or an integral body, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a communication between two elements, or an interaction 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 the embodiments of the present application, unless explicitly specified and limited otherwise, the term "contact" is to be understood in a broad sense as either direct contact or contact across an intermediate layer, as either contact with substantially no interaction force between the two in contact or contact with interaction force between the two in contact.

The present application will be described in detail below.

At present, new energy batteries are increasingly widely applied to life and industry. The new energy battery 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 a plurality of fields such as aerospace. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the production and manufacturing process of the battery cell, it is necessary to electrically connect the tab of the electrode assembly in the battery cell with the electrode terminal provided in the case through an electrical connector (e.g., a tab), so that an electric current can be led out from or into the electrode assembly.

In the related art, the electric connector is in a flat plate shape, the lug is integrally located below the electric connector and is generally connected with the electric connector in a state of being bent by 90 degrees, so that the space occupied by the lug in the height direction (third direction) along the battery unit is larger, the space utilization rate in the battery unit is not facilitated, the space occupied by the electrode main body of the electrode assembly is smaller, the volume of the electrode main body is positively related to the energy density of the battery unit, and the reduction of the volume of the electrode main body can affect the energy density of the battery unit.

The present application is directed to the problems occurring in the related art as described above, and proposes a battery cell including a case, an electrode assembly, electrode terminals, and an electrical connector. The housing is formed with a receiving chamber inside and includes a first wall formed with a mounting hole. The electrode assembly is located in the accommodating cavity and comprises an electrode main body and a tab connected with the electrode main body, and the thickness direction of the electrode main body is a first direction. The electrode terminal is arranged in the mounting hole in a penetrating manner. The electric connecting piece comprises a lug connecting part, an electrode terminal connecting part and an intermediate connecting part, wherein the lug connecting part is connected with the electrode lug, the electrode terminal connecting part is connected with the electrode terminal, the intermediate connecting part is connected with the lug connecting part and the electrode terminal connecting part, the lug connecting part and the electrode terminal connecting part are positioned on two opposite sides of the intermediate connecting part along a second direction, and the second direction is perpendicular to the first direction. At least one side of the tab connection part along the first direction is provided with an accommodating space, and at least part of the tab is accommodated in the accommodating space.

Because the tab connecting portion of the electric connecting piece has accommodation space along at least one side of the first direction, and at least part of tab is accommodated in the accommodation space, thereby, the accommodation space of the electric connecting piece along the side of the first direction can be fully utilized, the occupied space of the tab in the height direction (the third direction) is reduced, the tab is not wholly positioned below the electric connecting piece, thereby being beneficial to improving the space utilization rate in the shell of the battery, reserving larger space for the electrode main body, and further properly increasing the volume of the electrode main body and improving the energy density of the battery while not changing the shell size of the battery.

The battery monomer provided by the embodiment of the application can be used for, but not limited to, energy storage power supply systems, vehicles, ships or aircrafts and other power utilization devices, and energy storage devices such as energy storage containers and energy storage electric cabinets.

The embodiment of the application provides an electric device comprising the battery cell for providing electric energy, wherein the electric device comprises, but is not limited to, a mobile phone, a flat plate, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

In the following embodiments, for convenience of explanation, the electric device according to an embodiment of the present application will be described by taking the vehicle 1000 as an example. The following description refers to the accompanying drawings.

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

In some embodiments of the present application, the battery cell 100 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 provide driving power for the vehicle 1000.

Fig. 2 is an exploded perspective view of a battery device 400 according to an embodiment of the present application. As shown in fig. 2, the battery device 400 includes a case 401 and at least one battery cell 100, the case 401 includes a cover 401a and a base 401b, and the cover 401a covers over the base 401b, thereby forming a receiving area of the battery cell 100 between the base 401b and the cover 401 a.

In the battery device 400, the plurality of battery cells 100 may be connected in series, parallel, or a series-parallel connection between the plurality of battery cells 100, where the series-parallel connection refers to both the series connection and the parallel connection of the plurality of battery cells 100. The plurality of battery cells 100 can be directly connected in series, in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells 100 is placed in the accommodating space formed by the bottom plate 401b and the cover body 401 a. Of course, the battery unit 100 may be a battery module formed by connecting a plurality of battery units 100 in series or parallel or series-parallel connection, and a plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are accommodated in an accommodating space formed by the bottom plate 401b and the cover 401 a. The battery device 400 may further include other structures, for example, the battery device 400 may further include a bus bar member for making electrical connection between the plurality of battery cells 100.

Some embodiments of the present application are described in detail below with reference to fig. 3 to 9.

Fig. 3 is an exploded perspective view of a battery cell according to some embodiments of the present application. Fig. 4 is a schematic cross-sectional view of a battery cell provided in some embodiments of the application. Fig. 5 is an enlarged view of a portion a circled in fig. 4. Fig. 6 is a schematic perspective view of an electrical connector according to some embodiments of the present application. Fig. 7 is a schematic plan view of an electrical connector according to some embodiments of the present application. Fig. 8 is another schematic plan view of an electrical connector according to some embodiments of the present application. Fig. 9 is a schematic view of a partial planar structure of a positive electrode sheet, a negative electrode sheet, and a separator of an electrode body according to some embodiments of the present application.

In some embodiments of the present application, the first direction, the second direction, and the third direction are set to be perpendicular to each other for convenience of explanation, but it should be understood by those skilled in the art that the embodiments of the present application are not limited to the case where the three directions are perpendicular to each other. For convenience of explanation, as shown by the arrows in fig. 3 to 9, the direction of the arrow X is the first direction, the direction of the arrow Y is the second direction, and the direction of the arrow Z is the third direction. The direction of the arrow Z along the third direction is sometimes referred to as "upper" and the opposite direction is sometimes referred to as "lower".

A first aspect of the present application provides a battery cell 100, the battery cell 100 including a case 1, an electrode assembly 2, an electrode terminal 3, and an electrical connector 4. The housing 1 is internally formed with a housing chamber 1a, and the housing 1 includes a first wall 11, the first wall 11 being formed with a mounting hole. The electrode assembly 2 is positioned in the accommodating chamber 1a, and the electrode assembly 2 includes an electrode body 21 and a tab 22 connected to the electrode body 21, the thickness direction of the electrode body 21 being a first direction. The electrode terminal 3 is penetrated through the mounting hole. The electrical connector 4 includes a tab connection portion 41, an electrode terminal connection portion 42, and an intermediate connection portion 43. The tab connection part 41 connects the tab 22, the electrode terminal connection part 42 connects the electrode terminal 3, the intermediate connection part 43 connects the tab connection part 41 and the electrode terminal connection part 42, and the tab connection part 41 and the electrode terminal connection part 42 are located on opposite sides of the intermediate connection part 43 in the second direction, which is perpendicular to the first direction. At least one side of the tab connection portion 41 along the first direction has an accommodating space 10, and at least part of the tab 22 is accommodated in the accommodating space 10.

The battery cell 100 is a basic unit capable of performing mutual conversion between chemical energy and electric energy, and can be used to manufacture the battery device 400 for supplying power to an electric device or an energy storage device.

In the embodiment of the present application, the battery cell 100 is a secondary battery cell, and the secondary battery cell refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use.

The battery cell 100 may be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., which is not limited by the embodiment of the application.

In the embodiment of the present application, the battery cell 100 is a square case battery cell. In some other embodiments, the battery cell 100 may be a battery cell of other shapes, and the present application is not particularly limited.

As shown in fig. 3 to 5, the battery cell 100 includes a case 1, the case 1 being an outer protective case of the battery cell 100, and a receiving chamber 1a for receiving an electrode assembly 2, an electrolyte, and the like is formed inside. The shell 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.

In some embodiments, the housing 1 may be a sealed structure or a non-sealed structure. As an example, when the case 1 is a sealed structure, the case 1 functions to protect the electrode assembly 2 accommodated therein. A sealing pouch 12 may be further included between the case 1 and the electrode assembly 2, and the sealing pouch 12 is used to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealed bag 12 may be a bag-like insulating member or an aluminum plastic film.

The electrode assembly 2 is a component in which electrochemical reactions occur in the battery cell 100, and the electrode assembly 2 includes an electrode body 21. As shown in fig. 9, the electrode body 21 includes a positive electrode tab 211, a negative electrode tab 212, and a separator 213, and the positive electrode tab 211, the negative electrode tab 212, and the separator 213 are generally stacked in the thickness direction (first direction) of the battery cell. 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 tab 211 and the negative electrode tab 212. The separator 213 is disposed between the positive electrode sheet 211 and the negative electrode sheet 212, and can prevent the positive and negative electrode sheets from being short-circuited, and can pass active ions.

In some embodiments, the positive electrode tab 211 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.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

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

As an example, the positive electrode active material may include at least one of lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., liFePO4 (which may also be abbreviated as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., liMnPO 4), a composite of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite of lithium manganese phosphate and carbon.

In some embodiments, the positive electrode tab 211 may be made of a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material, but may be provided with the positive electrode active material. As an example, a lithium source material, which is lithium metal and/or a lithium-rich material, potassium metal or sodium metal, may also be filled and/or deposited within the foam metal.

In some embodiments, the negative electrode tab 212 may include a negative electrode current collector.

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

In some embodiments, the separator 213 is a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

In some embodiments, separator 213 is a solid state electrolyte.

In some embodiments, the electrode body 21 is a coiled structure. The positive pole piece and the negative pole piece are wound into a winding structure.

In some embodiments, the electrode body 21 is a lamination stack.

As an example, a plurality of positive electrode sheets 211 and negative electrode sheets 212 may be provided, respectively, and a plurality of positive electrode sheets 211 and a plurality of negative electrode sheets 212 may be alternately stacked.

As an example, a plurality of positive electrode sheets 211 may be provided, and the negative electrode sheet 212 is folded to form a plurality of folded sections that are stacked, with one positive electrode sheet 211 sandwiched between adjacent folded sections.

As an example, the positive electrode tab 211 and the negative electrode tab 212 are each folded to form a plurality of folded sections arranged in a stacked manner.

As an example, the separator 213 may be provided in plurality, respectively, between any adjacent positive electrode tab 211 or negative electrode tab 212.

As an example, the separator 213 may be continuously provided between any adjacent positive electrode sheet 211 or negative electrode sheet 212 by folding or winding.

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. The electrolyte may be liquid, gel or solid.

In some embodiments, the electrode assembly 2 includes tabs 22, which tabs 22 may conduct current away from the electrode body 21 or may conduct current to the electrode body 21. Tab 22 includes a positive tab 221 and a negative tab 222.

The electrode terminal 3 is inserted through the mounting hole of the first wall 11 of the case 1, and is partially positioned in the receiving cavity 1a of the case 1. The electrode terminal 3 is used to be directly or indirectly electrically connected with the tab 22 of the electrode assembly 2 to output power to the electrode body 21 of the electrode assembly 2 or input power to the electrode body 21 of the electrode assembly 2.

The first wall 11 is a wall surface of the case 1 to which the electrode terminal 3 is attached. The first wall 11 encloses a housing chamber 1a for housing the electrode assembly 2 together with other wall surfaces of the case 1. In the embodiment of the present application, the electrode terminal 3 is mounted on the end cap, i.e., the end cap is constructed as the first wall 11 of the case 1. In some other embodiments, if the electrode terminal 3 is mounted on the other wall surface of the case 1, the wall surface on which the electrode terminal 3 is mounted is configured as the first wall 11.

For example, the number of the electrode terminals 3 may be only one, and the electrode terminal 3 is connected to one of the positive electrode tab 221 or the negative electrode tab 222, and the other one of the positive electrode tab 221 or the negative electrode tab 222 is connected to the case 1. The number of the electrode terminals 3 may be two, and the two electrode terminals 3 are connected to the positive electrode tab 221 and the negative electrode tab 222, respectively.

In the embodiment of the present application, the electrode terminal 3 includes a positive electrode terminal 31 and a negative electrode terminal 32, the positive electrode terminal 31 is connected to the positive electrode tab 221, and the negative electrode terminal 32 is connected to the negative electrode tab 222. Accordingly, the case 1 is correspondingly formed with two mounting holes for mounting the positive electrode terminal 31 and the negative electrode terminal 32, respectively. It will be appreciated by those skilled in the art that in some other embodiments, the number of electrode terminals 3 may also be more (more than two). When the number of the electrode terminals 3 is plural, the plural electrode terminals 3 may be mounted on the same wall surface of the case 1 or may be mounted on different wall surfaces of the case 1. When a plurality of electrode terminals 3 are mounted on different wall surfaces of the case 1, respectively, the wall surface on which each electrode terminal 3 is mounted may be configured as the first wall 11.

The electrode terminal 3 may be, for example, a post, and the electrode terminal 3 may be made of a conductive material to realize a conductive function of the electrode terminal 3.

In the embodiment of the present application, the electrode terminal 3 is electrically connected to the tab 22 of the electrode assembly 2 through the electrical connection member 4. The electrical connection 4 may also be referred to as an adapter.

As shown in fig. 6 to 8, the electrical connector 4 includes a tab connection portion 41, an electrode terminal connection portion 42, and an intermediate connection portion 43. The tab connection portion 41 is a structure for connecting with the tab 22 in the electrical connector 4, and the electrode terminal connection portion 42 is a structure for connecting with the electrode terminal 3 in the electrical connector 4.

The tab 22 is welded to the tab connection part 41 by an ultrasonic welding process, and the electrode terminal 3 is welded to the electrode terminal connection part by a laser welding process, for example.

Of course, it will be appreciated by those skilled in the art that in some other embodiments, the tab 22 and the electrode terminal 3 may also be connected to the tab connection portion 41 and the electrode terminal connection portion 42, respectively, in any other suitable manner.

The intermediate connection portion 43 is a member of the electrical connector 4 that connects the tab connection portion 41 and the electrode terminal connection portion 42, and the tab connection portion 41 and the electrode terminal connection portion 42 are located on opposite sides of the intermediate connection portion 43 in the second direction, respectively.

In some embodiments, the width direction of the electrical connector 4 may be a first direction and the length direction of the electrical connector 4 may be a second direction. In the specific example shown in fig. 7 and 8, the up-down direction in fig. 7 and 8 is the first direction of the embodiment of the present application, and the left-right direction is the second direction of the embodiment of the present application.

In some embodiments, the thickness direction of the battery cell 100 may also be referred to as a first direction, and the direction in which the large surface (the wall surface having the largest area) of the case 1 is opposite may also be referred to as a first direction. The first direction may also be a direction in which the positive electrode tab 211, the negative electrode tab 212, and the separator 213 of the electrode body 21 are stacked, and it should be understood by those skilled in the art that when the electrode body 21 is a rolled structure, the electrode body 21 includes a curved section and a straight section, and in this case, the stacking direction of the positive electrode tab, the negative electrode tab, and the separator of the straight section is the first direction.

In some embodiments, the intermediate connection part 43 may be provided as a fusing part, i.e., such that the intermediate connection part 43 includes a thinned region and/or a fusing hole, etc., such that the intermediate connection part 43 is fused when the current exceeds a rated value, i.e., the current is excessively large, thereby disconnecting the tab connection part 41 from the electrode terminal connection part 42, thereby cutting off the electrical connection of the tab 22 and the electrode terminal 3, reducing the possibility of short-circuiting of the battery cell 100, and making the reliability of the battery cell 100 higher.

Illustratively, the electrical connector 4 may be formed as a unitary structure, for example, the plate-like member may be manufactured by stamping, bending, cutting, etc. to form the unitary electrical connector 4.

Also for example, the tab connection part 41, the electrode terminal connection part 42, and the intermediate connection part 43 of the electrical connector 4 may be separately formed in a split structure and then assembled by splicing.

In the related art, the tab is generally located under the electrical connector and is connected with the electrical connector in a state of being bent at 90 degrees, so that the space occupied by the tab in the height direction (third direction) of the battery cell is relatively large, which is not beneficial to the space utilization rate in the battery cell, so that the space occupied by the electrode main body of the electrode assembly is relatively small, and the volume of the electrode main body is positively related to the energy density of the battery cell, and therefore, the energy density of the battery cell is affected by the volume reduction of the electrode main body.

In the embodiment of the present application, as shown in fig. 4 and 5, at least one side of the tab connection part 41 along the first direction has the accommodating space 10, and at least part of the tab 22 is accommodated in the accommodating space 10, so that the accommodating space 10 on the side of the electrical connector 4 can be fully utilized, so that part of the tab 22 is located on the side of the electrical connector 4, but not all of the tab 22 is located below the electrical connector 4, thereby reducing the space occupied by the tab 22 in the height direction (third direction), being beneficial to improving the space utilization rate in the housing 1 of the battery cell 100, reserving a larger space for the electrode main body 21, and further being capable of properly increasing the volume of the electrode main body 21 and improving the energy density of the battery cell 100 while not changing the size of the housing 1 of the battery cell 100.

Specifically, as shown in fig. 4 and 5, in the third direction, a space region between the inner wall surface of the first wall 11 on the side facing the housing chamber 1a and the second surface 412 of the tab connection portion 41, and a space region between the tab connection portion 41 and the inner wall surface of the case 1 in the first direction, both space regions together define the housing space 10 for housing at least part of the tab 22.

The embodiment of the present application does not specifically limit the formation manner of the accommodating space 10, as long as enough space can be provided to accommodate the tab 22.

Illustratively, the tab connection part 41 has the receiving space 10 at both opposite sides thereof in the first direction. Also illustratively, the tab connection part 41 has the receiving space 10 only in either side of the first direction. Specific settings may be made according to the manner and number of extraction of the tabs 22 of the actual electrode assembly 2.

In some embodiments of the present application, the tab connection portion 41 includes a first surface 411 and a second surface 412 opposite to each other along the third direction, the first surface 411 faces the first wall 11, and the second surface 412 faces away from the first wall 11. The tab 22 includes a welding portion 223 and a bending portion 224, the welding portion 223 is connected to the bending portion 224, the welding portion 223 is welded to the second surface 412 of the tab connection portion 41, the bending portion 224 protrudes toward the side of the first wall 11 along the third direction relative to the welding portion 223, and the bending portion 224 is accommodated in the accommodating space 10. The third direction is perpendicular to both the first direction and the second direction.

As shown in fig. 3 to 5, the tab 22 includes a welding portion 223 and a bending portion 224, and the welding portion 223 is substantially flat, thereby facilitating welding with the tab connection portion 41. One end of the bent portion 224 is connected to the welding portion 223, and the other end is connected to the electrode main body 21, and the bent portion 224 protrudes toward the side of the first wall 11 with respect to the welding portion 223 in the third direction and is accommodated in the accommodating space 10.

When viewed along the second direction, the cross section of the bending portion 224 of the embodiment of the present application is substantially inverted U-shaped, and one side wall of the bending portion 224 is substantially inclined, so that the inclined side wall is not easy to interfere with the insulating member 5 (lower plastic) in the housing 1, and the space between the tab connection portion 41 and the inner wall of the housing 1 can be more fully utilized to accommodate the bending portion 224 of the tab 22.

In some other embodiments, the cross section of the bending portion 224 may be in a more regular inverted U shape, or any other suitable shape such as a step shape when viewed along the second direction. It should be understood by those skilled in the art that the shape of the bending portion 224 is not particularly limited in the embodiment of the present application, so long as the bending portion 224 can be accommodated in the accommodating space 10.

Therefore, the structure of the tab 22 can be more compact by changing the bending mode of the tab 22, and the dimension of the tab 22 along the third direction is smaller, so that the tab 22 occupies smaller space, the space in the accommodating cavity 1a of the housing 1 is saved, the space in the accommodating cavity 1a for accommodating the electrode main body 21 is increased, and the energy density of the battery cell 100 is improved.

The bent portion 224 of the tab 22 is accommodated in the accommodating space 10, so that the space on the side of the tab connection portion 41 can be fully utilized, the space in the accommodating cavity 1a of the housing 1 can be further saved, and the energy density of the battery cell 100 can be further improved.

In some embodiments of the present application, a difference between the first dimension and the second dimension in the third direction is greater than or equal to 0mm (millimeters) and less than or equal to 3mm (millimeters), wherein the first dimension is a distance dimension between the top surface of the bent portion 224 and the first wall 11, and the second dimension is a distance dimension between the first surface 411 of the tab connection portion 41 and the first wall 11.

Illustratively, the difference between the first dimension and the second dimension may be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or the like.

The top surface of the bent portion 224 refers to a surface of the bent portion 224 closest to the side of the first wall 11 in the first direction.

Thus, the top surface of the bent portion 224 is substantially flush with the first surface 411 of the tab connection portion 41 or slightly higher than the first surface 411 of the tab connection portion 41 in the third direction, so that the region of the receiving space 10 in the height direction can be fully utilized to receive the tab 22 more, thereby providing a larger space for the electrode body 21 and increasing the energy density of the battery cell 100.

Flush means that the top surface of the bent portion 224 is substantially in the same horizontal plane as the first surface 411 of the tab connection portion 41.

Of course, it should be understood by those skilled in the art that in some other embodiments, for example, when the length of the tab 22 is shorter, the top surface of the bending portion 224 may be lower than the first surface 411 of the tab connection portion 41, and the user may set the configuration according to the actual situation.

In some embodiments of the present application, at least a portion of the tab connection portion 41 is recessed along the first direction to form a groove portion 413, the groove portion 413 defining at least a portion of the receiving space 10.

As shown in fig. 6 to 8, the tab connection part 41 has a smaller size in the first direction than the electrode terminal connection part 42, and at least part of the tab connection part 41 is recessed in the first direction to form a groove part 413, whereby the accommodating space 10 for accommodating at least part of the bent part 224 of the tab 22 can be constructed by the groove part formed by the tab connection part 41, so that the energy density of the battery cell 100 can be increased without changing the size of the case 1 of the battery cell 100.

Illustratively, the receiving space 10 may be defined entirely by the groove portion 413.

As another example, the accommodating space 10 may be defined only partially by the groove portion 413, i.e., there is also a certain interval region between the outermost edge of the electrical connector 4 and the inner wall of the housing 1, and then the accommodating space 10 may be defined jointly by the groove portion 413 and the interval region between the outermost edge of the electrical connector 4 and the inner wall of the housing, the groove portion 413 being a part of the accommodating space 10.

As shown in fig. 6 and 7, the groove portion 413 may integrally penetrate the tab connection portion 41 in the second direction, that is, at least one side of the tab connection portion 41 in the first direction is integrally recessed in the first direction to form the groove portion 413.

As shown in fig. 8, the groove portion 413 may extend only partially through the tab connection portion 41 in the second direction, that is, at least one side portion of the tab connection portion 41 in the first direction may be recessed in the first direction to form the groove portion 413.

In an embodiment of the present application, the groove portion 413 is generally rectangular in shape. In some other embodiments, the groove portion 413 may also have any other suitable shape, such as trapezoidal, polygonal, etc.

The embodiment of the present application does not specifically limit the formation position and shape of the groove 413 on the tab connection portion 41, and the user can set the position and shape of the groove 413 according to the protruding position and shape of the actual tab 22.

When the tab connection part 41 is formed with the groove parts 413 at opposite sides in the first direction, the shape and size of the two groove parts 413 may be the same or different.

In some embodiments of the present application, the battery cell 100 further includes an insulating member 5, and the insulating member 5 is located at a side of the first wall 11 facing the electrode assembly 2. In the first direction, the width of the bent portion 224 is smaller than the dimension of the distance between the groove bottom wall 4131 of the groove portion 413 and the outer edge of the insulating member 5.

The insulating member 5 is made of an insulating material, and is located between the first wall 11 and the electrode assembly 2. The insulator 5 may be integrally preformed from plastic or assembled from plastic components. When the case 1 is made of a metal material, the insulating member 5 can electrically insulate the electrode assembly 2 from the first wall 11, reducing the possibility of short circuits caused by the contact of the tab 22 with the first wall 11 made of a metal material. In addition, the insulating member 5 can also play a certain supporting role on the electrode assembly 2, and the possibility of the electrode assembly 2 moving inside the accommodating cavity 1a is reduced.

The insulator 5 may be a plastic frame, for example.

The groove bottom wall 4131 of the groove portion 413 refers to a wall surface of the groove portion 413 on the side farthest from the inner wall of the housing 1 in the first direction, and the outer edge of the insulating member 5 refers to an edge of the insulating member 5 on the side closer to the inner wall of the housing 1 in the first direction.

Therefore, the shape of the tab 22 can be ensured to be good, and the bending part 224 of the tab 22 can be better accommodated in the accommodating space 10, so that the space occupied by the tab 22 in the accommodating cavity 1a along the third direction is saved, and the energy density of the battery cell 100 is improved. Moreover, the tab 22 is not easily contacted with the case 1, and the possibility of short circuit of the battery cell 100 is reduced.

Specifically, in the first direction, the dimension of the distance between the groove bottom wall 4131 of the groove portion 413 and the outer edge of the insulator 5 is greater than or equal to the third dimension. The third dimension is the sum of the distance dimension between the case 1 and the insulator 5 in the first direction and half the width of the tab connection portion 41 in the first direction.

As shown in fig. 5 and 7, when the distance between the groove bottom wall 4131 of the groove portion 413 and the outer edge of the insulator 5 is q, the distance between the case 1 and the insulator 5 in the first direction is a, and the width of the tab connection portion 41 in the first direction is b

Typically, the tab connection portion 41 has a width in the first direction of greater than 8mm, thereby facilitating over-current and welding of the tab connection portion 41 to the tab 22. The distance dimension between the housing 1 and the insulator 5 in the first direction is 2mm.

Thus, when q is 6mm or more, the accommodating space 10 can be made to have a sufficient space to accommodate the bent portion 224 of the tab 22.

In addition, the dimension of the distance between the groove bottom wall 4131 of the groove portion 413 and the outer edge of the insulator 5 is smaller than or equal to the fourth dimension. The fourth dimension is one half of the thickness of the battery cell 100 in the first direction minus the third dimension.

As shown in fig. 4, if the thickness of the battery cell 100 in the first direction is l, then

Typically, l is greater than 24mm and the third dimension is greater than or equal to 6mm.

Thus, the tab connection portion 41 can meet the overcurrent requirement of the tab connection portion 41 and the requirement of welding with the welding portion 223 of the tab 22 while forming the groove portion 413.

In some embodiments of the application, the width of the groove portion 413 is less than or equal to half the width of the electrical connector 4 in the first direction.

As shown in fig. 7, when the width of the groove 413 in the first direction is u and the width of the electrical connector 4 in the first direction is t

When u is greater thanIn this case, the groove 413 exceeds the central axis of the tab connection portion 41, so that the tab connection portion 41 is eccentric, and therefore, at least the tab 22 on one side of the tab connection portion 41 along the first direction needs to be extended, so that the tab 22 can be welded to the tab connection portion 41.

Thus, it is necessary to make u smaller than or equal toTherefore, the tab 22 can be well welded with the tab connecting part 41 without excessive elongation, the possibility of the occurrence of the redundancy of the tab 22 is reduced, and the production cost is effectively reduced.

It will be understood by those skilled in the art that when the tab connection portion 41 is formed with the groove portions 413 on opposite sides thereof in the first direction, the dimension u of both groove portions 413 in the first direction is smaller thanOr the dimension u of one groove portion 413 in the first direction is equal toWhile the dimension u of the other groove portion 413 in the first direction is smaller thanSo that the tab connection part 41 has a sufficient space to be welded with the welding part 223 of the tab 22.

In some embodiments of the present application, the width of the groove portion 413 is equal to or greater than the fifth dimension in the first direction. The fifth dimension is a dimension of a distance between the groove bottom wall 4131 of the groove portion 413 and the housing 1 in the first direction minus a dimension of a distance between the electrical connector 4 and the housing 1 in the first direction.

Normally, the distance dimension between the groove bottom wall 4131 of the groove portion 413 and the housing 1 in the first direction is 8mm. In addition, since the distance between both sides of the electric connector 4 in the first direction and the inner wall of the case 1 is spaced, the distance between the electric connector 4 and the case 1 in the first direction is equal to the thickness l of the battery cell 100 in the first direction minus the dimension t of the electric connector 4 in the first direction divided by 2

Thereby, at least one side of the tab connection part 41 in the first direction has a sufficient space to accommodate the bent part 224 of the tab 22, thereby advantageously improving the energy density of the battery cell 100.

In some embodiments of the application, the length of the groove portion 413 is less than or equal to the length of the electrical connector 4 and greater than or equal to the length of the tab 22 plus the error dimension in the second direction.

The error size refers to a process error generated by processing the tab 22 or bending the tab 22, and is usually ±8mm.

Thus, the groove 413 can better accommodate the bending portion 224 of the tab 22 in the longitudinal direction (second direction), the possibility of interference between the groove side wall of the groove 413 and the bending portion 224 is reduced, and the reliability of the battery cell 100 is improved.

In some embodiments of the present application, the electrode terminal connection part 42 and the tab connection part 41 extend in the second direction, the intermediate connection part 43 extends in the third direction, and the tab connection part 41 is disposed closer to the first wall 11 than the electrode terminal connection part 42 in the third direction. The third direction is perpendicular to both the first direction and the second direction.

As shown in fig. 6, the electrical connector 4 is generally Z-shaped, i.e., the tab connection portion 41 and the electrode terminal connection portion 42 have a certain height difference therebetween, when viewed in the first direction, and the tab connection portion 41 is disposed close to the first wall 11 in the third direction, whereby the space of the first wall 11 toward the receiving cavity 1a side can be fully utilized to receive the bent portion 224, i.e., the space generated by the height difference between the tab connection portion 41 and the electrode terminal connection portion 42 can be fully utilized, thereby further saving the dimension of the tab 22 in the third direction, reserving a larger space for the electrode main body 21, and improving the energy density of the battery cell 100.

Of course, it should be understood by those skilled in the art that, in some other embodiments, the electrical connector 4 may be entirely flat, and the shape of the electrical connector 4 is not specifically limited in the embodiments of the present application, and may be specifically set according to practical situations.

In some embodiments of the present application, the number of the groove portions 413 is two, and the two groove portions 413 are located at opposite sides of the tab connection portion 41 in the first direction. The two groove portions 413 are identical in shape and size or different in size.

Thus, the shape and size of the groove 413 can be set according to the lead-out shape and size of the actual tab 22, so that different tab 22 forms can be adapted.

Illustratively, in an embodiment of the present application, both groove portions 413 are generally rectangular in shape, and the dimensions of both groove portions 413 are the same.

Illustratively, in some other embodiments, the shape of the two groove portions 413 is not the same, and the dimensions of the two groove portions 413 are also not the same.

In some embodiments of the present application, the tab connection part 41 is flat and/or the electrode terminal connection part 42 is flat.

Thereby, the electrode terminal 3 and the tab 22 are more favorably connected with the electrode terminal connecting part 42 and the tab connecting part 41, respectively, so that the reliability of the electric connector 4 is better,

Of course, those skilled in the art will appreciate that in some other embodiments, the tab connection portion 41 and the electrode terminal connection portion 42 may take any other suitable shape.

In some embodiments of the present application, the electrode terminal 3 includes a positive electrode terminal 31 and a negative electrode terminal 32. The electrical connector 4 comprises a first electrical connector 44 and a second electrical connector 45. The tab 22 includes a positive tab 221 and a negative tab 222, the positive tab 221 is located on the same side as the positive terminal 31, and/or the negative tab 222 is located on the same side as the negative terminal 32, the positive tab 221 is connected to the positive terminal 31 through the first electrical connector 44, and the negative tab 222 is connected to the negative terminal 32 through the second electrical connector 45.

Thereby, at least part of the positive electrode tab 221 can be accommodated in the accommodating space 10 provided on at least one side of the first electrical connector 44 along the first direction, and at least part of the negative electrode tab 222 can be accommodated in the accommodating space 10 provided on at least one side of the second electrical connector 45 along the first direction, so that the size of the positive electrode tab 221 and the negative electrode tab 222 along the third direction can be reduced, and a larger space is reserved for the electrode main body 21 in the accommodating cavity 1a, which is beneficial to improving the energy density of the battery cell 100.

It should be understood by those skilled in the art that the positive tab 221 and the negative tab 222 may be disposed at any end of the electrode body 21, and the disposition positions of both are not particularly limited in the embodiment of the present application.

In addition, since the positive electrode tab 221 and the positive electrode terminal 31 are located at the same side and/or the negative electrode tab 222 and the negative electrode terminal 32 are located at the same side, connection of the tab 22 and the electrode terminal 3 is more facilitated, and space in the battery cell case can be saved, which is advantageous for improving energy density of the battery cell.

Illustratively, the positive tab 221 is on the same side as the positive terminal 31 and the negative tab 222 is on the same side as the negative terminal 32.

Also illustratively, the positive tab 221 is on the same side as the positive terminal 31 and the negative tab 222 is on a different side than the negative terminal 32.

Further exemplary, the positive tab 221 is located on a different side from the positive terminal 31, and the negative tab 222 is located on the same side as the negative terminal 32.

It should be understood by those skilled in the art that when the tab 22 and the electrode terminal 3 are located on the same side, the tab connection portion 41 of the electrical connector 4 is generally in a flat plate shape extending in one direction, and the positive tab 221 and the negative tab 222 may be located on the same side of the electrode body 21 or may be located on different sides of the electrode body 21, respectively.

Illustratively, the positive tab 221 and the negative tab 222 are located on the same side of the electrode body 21, and the positive terminal 31 and the negative terminal 32 are located on the same side as the positive tab 221 and the negative tab 222.

Also illustratively, the positive tab 221 and the negative tab 222 are located on different sides of the electrode body 21, the positive terminal 31 is located on the same side as the positive tab 221, and the negative terminal 32 is located on the same side as the negative tab 222.

In some embodiments of the present application, the electrode terminal 3 includes a positive electrode terminal 31 and a negative electrode terminal 32. The electrical connector 4 comprises a first electrical connector 44 and a second electrical connector 45. The tab 22 includes a positive tab 221 and a negative tab 222, the positive tab 221 and the positive terminal 31 are located on different sides, and/or the negative tab 222 and the negative terminal 32 are located on different sides, the positive tab 221 is connected to the positive terminal 31 through the first electrical connector 44, and the negative tab 222 is connected to the negative terminal 32 through the second electrical connector 45.

Thereby, at least part of the positive electrode tab 221 can be accommodated in the accommodating space 10 provided on at least one side of the first electrical connector 44 along the first direction, and at least part of the negative electrode tab 222 can be accommodated in the accommodating space 10 provided on at least one side of the second electrical connector 45 along the first direction, so that the size of the positive electrode tab 221 and the negative electrode tab 222 along the third direction can be reduced, and a larger space is reserved for the electrode main body 21 in the accommodating cavity 1a, which is beneficial to improving the energy density of the battery cell 100.

In addition, since the positive electrode tab 221 and the positive electrode terminal 31 are located at different sides and/or the negative electrode tab 222 and the negative electrode terminal 32 are located at different sides, it is advantageous to improve the flexibility of connection of the tab 22 and the electrode terminal 3 and to improve the flexibility of connection of the battery cells 100 to each other when a plurality of battery cells 100 are grouped.

Illustratively, positive tab 221 is located on a different side than positive terminal 31, and negative tab 222 is located on a different side than negative terminal 32.

Also illustratively, the positive tab 221 is on the same side as the positive terminal 31 and the negative tab 222 is on a different side than the negative terminal 32.

Further exemplary, the positive tab 221 is located on a different side from the positive terminal 31, and the negative tab 222 is located on the same side as the negative terminal 32.

It will be understood by those skilled in the art that when the tab 22 and the electrode terminal 3 are located at different sides, the tab connection portion 41 of the electrical connector 4 is generally in an "L" shape or an inverted "L" shape, that is, the tab connection portion 41 includes two sections extending in different directions, one of which is the same as the extending direction of the electrode terminal connection portion 42 and the other of which is perpendicular to the extending direction of the electrode terminal connection portion 42, so as to connect the electrode terminal 3 and the tab 22 located at different sides.

When the tab 22 and the electrode terminal 3 are located on different sides, the positive electrode tab 221 and the negative electrode tab 222 may be located on the same side of the electrode body 21, or may be located on different sides of the electrode body 21.

Illustratively, the positive tab 221 and the negative tab 222 are located on the same side of the electrode body 21, and the positive terminal 31 and the negative terminal 32 are located on different sides from the sides of the positive tab 221 and the negative tab 222, and in this case, the positive terminal 31 and the negative terminal 32 may be located on the same side or on different sides.

Further illustratively, the positive tab 221 and the negative tab 222 are located on different sides of the electrode body 21, and the positive terminal 31 and the negative terminal 32 are located on different sides of the positive tab 221 and the negative tab 222, respectively.

Further exemplary, the positive tab 221, the negative tab 222, the positive terminal 31, and the negative terminal 32 may be located at four different sides, respectively.

In some embodiments of the present application, the number of the electrode assemblies 2 is plural, the plural electrode assemblies 2 are arranged side by side along the first direction, and the same-polarity tabs 22 of the plural electrode assemblies 2 are connected by the same electrical connector 4.

The plurality of electrode assemblies 2 can increase the energy density of the battery cell 100. And a plurality of electrode assemblies 2 are connected through the same electric connecting piece 4 to the electrode lugs 22 with the same polarity, so that the assembly steps of the battery cell 100 can be reduced, the assembly difficulty is reduced, and the production cost is reduced.

The second aspect of the present application provides an electrical connector 4 for a battery cell 100, the thickness direction of the battery cell 100 being a first direction, the electrical connector 4 including a tab connection portion 41, an electrode terminal connection portion 42, and an intermediate connection portion 43. The tab connection portion 41 is used to connect with the tab 22 of the battery cell 100. The electrode terminal connection part 42 is used to connect with the electrode terminal 3 of the battery cell 100. The intermediate connection portion 43 connects the tab connection portion 41 and the electrode terminal connection portion 42, and the tab connection portion 41 and the electrode terminal connection portion 42 are located on opposite sides of the intermediate connection portion 43 in a second direction, which is perpendicular to the first direction. At least one side of the tab connection portion 41 along the first direction has an accommodating space 10, where the accommodating space 10 is used for accommodating at least part of the tab 22.

Because the tab connection part 41 of the electric connector 4 has the accommodation space 10 along at least one side of the first direction, and the accommodation space 10 can be used for accommodating at least part of the tabs 22, thereby fully utilizing the accommodation space 10 of the electric connector 4 along the side of the first direction, reducing the space occupied by the tabs 22 in the height direction (third direction), so that the tabs 22 are not wholly located below the electric connector 4, thereby being beneficial to improving the space utilization rate in the housing 1 of the battery cell 100, reserving a larger space for the electrode main body 21, and further properly increasing the volume of the electrode main body 21 and improving the energy density of the battery cell 100 while not changing the size of the housing 1 of the battery cell 100.

A third aspect of the present application provides a battery device 400, where the battery device 400 includes a housing 401 and at least one battery cell 100 according to the first aspect of the present application, and the battery cell 100 is accommodated in the housing 401.

The battery device 400 provided by the present application, due to the inclusion of the battery cell 100 provided by the first aspect, can reduce the space occupied by the tab 22 along the third direction, and further can increase the space occupied by the electrode body 21, which is beneficial to improving the energy density of the battery cell 100, so as to improve the energy density of the battery device 400.

A fourth aspect of the present application provides an electric device comprising the battery cell 100 according to the first aspect of the present application or the battery device 400 according to the third aspect of the present application for providing electric energy.

The power consumption device according to the embodiment of the present application, including the battery cell 100 provided in the first aspect or the battery device 400 provided in the third aspect, may reduce the space occupied by the tab 22 of the battery cell 100 along the third direction, thereby increasing the space occupied by the electrode body 21, and being beneficial to increasing the energy density of the battery cell 100, so as to increase the energy density of the battery device 400, and thus, may prolong the power supply time of the battery cell 100 or the battery device 400 to the power consumption device.

A fifth aspect of the present application provides an energy storage device comprising a battery cell 100 according to the first aspect of the present application or a battery device 400 according to the third aspect of the present application for providing electrical energy.

The energy storage device according to the embodiment of the present application, due to the inclusion of the battery cell 100 provided in the first aspect or the battery device 400 provided in the third aspect, may reduce the space occupied by the tab 22 of the battery cell 100 along the third direction, thereby increasing the space occupied by the electrode body 21, and being beneficial to increasing the energy density of the battery cell 100, so as to increase the energy density of the battery device 400, and thus, may prolong the power supply time of the battery cell 100 or the battery device 400 to the energy storage device.

Specific examples of some embodiments of the present application are described below with reference to the drawings.

As a specific example, the battery cell (battery cell 100) includes a switching piece (electrical connector 4), a bare cell (electrode body 21), and a tab 22, which is connected to the bare cell. Through narrowing the width that is in ultrasonic bonding district's switching piece body (utmost point ear connecting portion 41) at electric core thickness direction (first direction), form fluting (recess portion 413), leave cavity (accommodation space 10) at switching piece and plastic (insulating piece 5) and be used for holding the utmost point ear, reduce the height of drawing in of utmost point ear, and then reduce the space of the high direction (third direction) that the utmost point ear was taken up in to can increase the accommodation of naked electric core, improve the energy density of electric core.

In order to ensure good tab folding morphology, the distance between the edge of the switching piece and the lower plastic edge needs to satisfy: Wherein the distance between the edge of the switching piece and the lower plastic edge is q, and the thickness of the battery cell is l, l >24.

The form of the flap edge slot is not limited to rectangular, trapezoidal, polygonal slots. The grooving width u meets the following condition And l-t is less than 16, when l-t is more than or equal to 16, slotting is not needed, and the slotting length y meets that r is more than or equal to y is more than or equal to i. The length (the dimension along the second direction) of the switching piece is r, the width (the dimension along the first direction) of the switching piece is t, and the width (the dimension along the second direction) of the tab is increased by the dislocation dimension i.

The tab may be partially grooved according to the difference in position and size of the tab, and the positions, shapes, and sizes of grooves on opposite sides of the tab in the first direction may be the same or different.

The foregoing embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing embodiments may be modified or some or all of the technical features may be equivalently replaced, and the modification or replacement does not deviate the essence of the corresponding technical solution from the scope of the technical solution of the embodiments of the present application, and is intended to be covered in the scope 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.

Claims (20)

1. A battery cell, the battery cell comprising:

A housing having a receiving cavity formed therein, the housing including a first wall formed with a mounting hole;

The electrode assembly is positioned in the accommodating cavity and comprises an electrode main body and a tab connected with the electrode main body, and the thickness direction of the electrode main body is a first direction;

an electrode terminal penetrating the mounting hole, and

The electrode terminal connecting part is connected with the electrode terminal, the middle connecting part is connected with the electrode terminal connecting part, the electrode terminal connecting part and the middle connecting part are positioned on two opposite sides of the middle connecting part along a second direction, and the second direction is perpendicular to the first direction;

The tab connection part is provided with an accommodating space along at least one side of the first direction, and at least part of the tab is accommodated in the accommodating space.

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

The tab connection part comprises a first surface and a second surface which are opposite along a third direction, wherein the first surface faces the first wall, and the second surface faces away from the first wall;

The electrode lug comprises a welding part and a bending part, the welding part is connected with the bending part, the welding part is welded with the second surface of the electrode lug connecting part, the bending part protrudes towards the side where the first wall is located along the third direction relative to the welding part, and the bending part is accommodated in the accommodating space;

the third direction is perpendicular to both the first direction and the second direction.

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

And along the third direction, the difference between the first dimension and the second dimension is greater than or equal to 0mm and less than or equal to 3mm, wherein the first dimension is the distance dimension between the top surface of the bending part and the first wall, and the second dimension is the distance dimension between the first surface of the tab connection part and the first wall.

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

At least part of the tab connection parts are recessed along the first direction to form groove parts, and the groove parts define at least part of the accommodating space.

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

The battery cell further includes an insulating member located at a side of the first wall facing the electrode assembly;

the width of the bending part is smaller than the distance between the bottom wall of the groove part and the outer edge of the insulating piece along the first direction.

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

A distance dimension between a bottom wall of the groove portion and an outer edge of the insulating member in the first direction is greater than or equal to a third dimension;

The third dimension is the sum of the distance dimension between the shell and the insulating piece along the first direction and half of the width of the tab connection part along the first direction.

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

The distance between the bottom wall of the groove and the outer edge of the insulator is smaller than or equal to the fourth dimension;

Wherein the fourth dimension is one half of the thickness of the battery cell in the first direction minus the third dimension.

8. The battery cell according to any one of claim 4 to 7, wherein,

The width of the groove portion is less than or equal to half the width of the electrical connector along the first direction.

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

The width of the groove part is larger than or equal to a fifth dimension along the first direction;

The fifth dimension is a dimension of a distance between a bottom of the groove portion and the housing along the first direction minus a dimension of a distance between the electrical connector and the housing along the first direction.

10. The battery cell according to any one of claim 4 to 7, wherein,

Along the second direction, the length of the groove part is smaller than or equal to the length of the electric connecting piece, and is larger than or equal to the length of the tab plus an error dimension.

11. The battery cell according to any one of claim 1 to 7, wherein,

The electrode terminal connection portion and the tab connection portion extend in the second direction, the intermediate connection portion extends in a third direction, and the tab connection portion is closer to the first wall in the third direction than the electrode terminal connection portion.

12. The battery cell according to any one of claim 4 to 7, wherein,

The number of the groove parts is two, and the two groove parts are positioned at two opposite sides of the tab connecting part along the first direction;

the shape and the size of the two groove parts are the same or different.

13. The battery cell according to any one of claim 1 to 7, wherein,

The tab connection part is flat and/or

The electrode terminal connection part is flat.

14. The battery cell according to any one of claim 1 to 7, wherein,

The electrode terminals include a positive electrode terminal and a negative electrode terminal;

The electrical connector comprises a first electrical connector and a second electrical connector;

The tab comprises a positive tab and a negative tab, the positive tab and the positive terminal are located on the same side, and/or the negative tab and the negative terminal are located on the same side, the positive tab is connected with the positive terminal through the first electric connecting piece, and the negative tab is connected with the negative terminal through the second electric connecting piece.

15. The battery cell according to any one of claim 1 to 7, wherein,

The electrode terminals include a positive electrode terminal and a negative electrode terminal;

The electrical connector comprises a first electrical connector and a second electrical connector;

The electrode tab comprises an anode tab and a cathode tab, the anode tab and the anode terminal are located on different sides, and/or the cathode tab and the cathode terminal are located on different sides, the anode tab is connected with the anode terminal through the first electric connecting piece, and the cathode tab is connected with the cathode terminal through the second electric connecting piece.

16. The battery cell according to any one of claim 1 to 7, wherein,

The electrode assemblies are arranged in parallel along the first direction, and the electrode lugs with the same polarity of the electrode assemblies are connected through the same electric connecting piece.

17. An electrical connector for a battery cell, the thickness direction of the battery cell being a first direction, the electrical connector comprising:

the tab connection part is used for being connected with the tab of the battery cell;

An electrode terminal connection part for connecting with the electrode terminal of the battery cell, and

An intermediate connection part connecting the tab connection part and the electrode terminal connection part, the tab connection part and the electrode terminal connection part being positioned at opposite sides of the intermediate connection part in a second direction perpendicular to the first direction;

The tab connection part is provided with an accommodating space along at least one side of the first direction, and the accommodating space is used for accommodating at least part of the tab.

18. A battery device, characterized in that the battery device comprises:

Case body, and

At least one battery cell according to any one of claims 1 to 16, which is accommodated in the case.

19. An electrical device comprising the battery cell of any one of claims 1 to 16 or the battery device of claim 18 for providing electrical energy.

20. An energy storage device comprising a battery cell according to any one of claims 1 to 16 or a battery device according to claim 18 for providing electrical energy.