CN216903262U - Battery cell, battery and power consumption device - Google Patents

Abstract

The application relates to a battery monomer, battery and power consumption device belongs to battery manufacturing technical field. The application provides a battery monomer, includes: a first electrode lead-out piece, only one of two surfaces in a thickness direction of which includes a first exposed surface; a second electrode lead-out member having a polarity opposite to that of the first electrode lead-out member, only one of two surfaces of the second electrode lead-out member in a thickness direction thereof including a second exposed surface; wherein the first exposed face is oriented opposite the second exposed face. The application also provides a battery and an electric device, comprising the battery monomer. The battery cell has better safety performance in the assembly process.

Description

Battery cell, battery and power consumption device

Technical Field

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

Background

With the continuous prosperity of the new energy automobile market, the power battery industry is rapidly expanded and strengthened, the lithium battery technology is increasingly refined, and higher requirements on the safety performance, the energy density and the industrialization requirements of the battery monomer are provided.

For the battery cell, when thermal runaway occurs, the battery cell cracks and releases the internal pressure through the air blowing of the packaging bag, and the battery cell has better safety performance in use. However, during the assembly of the battery cell, the battery cell may be short-circuited due to the factors such as transportation and contact of foreign matters, and the battery cell may be discarded.

SUMMERY OF THE UTILITY MODEL

Therefore, the application provides a battery cell, a battery and an electric device, wherein the battery cell has better safety performance in the assembling process.

An embodiment of a first aspect of the present application provides a battery cell, including: a first electrode lead-out piece, only one of two surfaces in a thickness direction of which includes a first exposed surface; a second electrode lead-out member having a polarity opposite to that of the first electrode lead-out member, only one of two surfaces of the second electrode lead-out member in a thickness direction thereof including a second exposed surface; wherein the first exposed face is oriented opposite the second exposed face.

In the process of the battery monomer equipment of this application embodiment, because the orientation of first exposed surface is opposite with the orientation of second exposed surface, when first electrode extraction piece and second electrode extraction piece are direct or indirect contact, the probability of first exposed surface and second exposed surface contact is less to reduced first electrode extraction piece and second electrode extraction piece short circuit and leaded to the inside probability that takes place the short circuit of battery monomer, and then made battery monomer have better security performance in the assembling process.

According to some embodiments of the present application, the battery cell further comprises: packaging bags; an electrode assembly housed in the packaging bag; wherein the first electrode lead-out member and the second electrode lead-out member are electrically connected to the electrode assembly, and a surface of the first electrode lead-out member facing away from the first exposed surface in a thickness direction thereof is covered with the packaging bag; a surface of the second electrode lead-out member facing away from the second exposed surface in a thickness direction is covered with the packaging bag.

In the above scheme, deviate from in the thickness direction of first electrode extraction piece deviate from in the thickness direction of the surface of first exposed surface and second electrode extraction piece the surface of second exposed surface all is by the wrapping bag cladding, when first electrode extraction piece and second electrode extraction piece directly or indirectly contact, first exposed surface probably with the surface contact of wrapping bag, the second exposed surface probably with the surface contact of wrapping bag, can reduce the possibility that the exposed surface of first electrode extraction piece and the exposed surface of second electrode extraction piece contacted, can reduce first electrode extraction piece and second electrode extraction piece short circuit and lead to the possibility that the battery monomer takes place the short circuit.

According to some embodiments of the present application, the packaging bag includes a first packaging film and a second packaging film, the electrode assembly is disposed between the first packaging film and the second packaging film, the first packaging film is formed with a first opening, the first exposed face is exposed from the first opening, the second packaging film is formed with a second opening, the second exposed face is exposed from the second opening.

In the above scheme, the first exposed surface and the second exposed surface are respectively exposed out of the packaging bag from the first opening and the second opening of the packaging bag, on one hand, the packaging bag in the form is simple in structure, the assembly process of the single battery can be simplified, and the manufacturing cost of the single battery can be reduced; on the other hand, the surface that first electrode extraction piece thickness direction deviates from first exposed surface and the surface that deviates from the second exposed surface in second electrode extraction piece thickness direction all are sealed in the inside of wrapping bag, have increased the inner space of wrapping bag, have increased the capacity of the electrolyte that the wrapping bag can hold, have improved the free electric capacity of battery.

According to some embodiments of the present application, the packaging bag includes a first packaging film and a second packaging film, the first packaging film includes a first body and a first extension portion extending from an edge of the first body, the second packaging film includes a second body and a second extension portion extending from an edge of the second body, the electrode assembly is disposed between the first body and the second body, a surface of the first exposed surface deviating from the thickness direction of the first electrode lead-out member is coated by the first extension portion, and a surface of the second exposed surface deviating from the thickness direction of the second electrode lead-out member is coated by the second extension portion.

In the above-mentioned scheme, first electrode extraction piece and second electrode extraction piece expose the outside of first body and second body from the encapsulation edge of first wrapping film and second wrapping film, easily battery monomer's shaping. And the surface of the first electrode leading-out piece deviating from the first exposed surface in the thickness direction is coated by the first extension part, the surface of the second electrode leading-out piece deviating from the second exposed surface in the thickness direction is coated by the second extension part, the first exposed surface and the second exposed surface are exposed out of the first body and the second body, the first electrode leading-out piece and the second electrode leading-out piece can be conveniently connected with external components, and the assembly process of the battery monomer and other components is simplified.

According to some embodiments of the present application, the battery cell further comprises: a first sealing member sealing a gap between an edge of the first electrode lead-out member and the package bag; and a second sealing member sealing a gap between an edge of the second electrode lead-out member and the packaging bag.

In the above scheme, the first sealing member can seal the gap between the edge of the first electrode leading-out member and the packaging bag, the second sealing member can seal the gap between the edge of the second electrode leading-out member and the packaging bag, a closed space is formed when the packaging bag is exposed out of the first exposed surface and the second exposed surface, and the electrolyte in the packaging bag is prevented from leaking outwards, so that the single battery still has better safety performance and electric capacity after being used for a long time.

According to some embodiments of the application, first sealing member with the second sealing member is sealed glue, first electrode lead-out piece passes through first sealing member with the wrapping bag is connected, second electrode lead-out piece passes through the second sealing member with the wrapping bag is connected.

In the scheme, the sealant is used for filling the gap between the edge of the first electrode leading-out piece and the packaging bag and the gap between the edge of the second electrode leading-out piece and the packaging bag, and the first sealing piece and the second sealing piece are formed after the sealant is cured.

According to some embodiments of the present application, the first sealing member is provided with one turn along an edge of the first electrode lead-out member, and the second sealing member is provided with one turn along an edge of the second electrode lead-out member.

In the above aspect, the first sealing member circumferentially seals a gap between the edge of the first electrode lead-out member and the packaging bag, and the second sealing member circumferentially seals a gap between the edge of the second electrode lead-out member and the packaging bag, so as to reliably form a closed space while exposing the first exposed surface and the second exposed surface of the packaging bag.

According to some embodiments of the present application, the battery cell further comprises: a first heat insulating member covering a side of the first electrode lead-out member facing away from the first exposed surface in a thickness direction; and a second heat insulating member covering a side of the second electrode lead-out member facing away from the second exposed surface in a thickness direction.

In the above-mentioned scheme, a side of the first electrode lead-out member departing from the first exposed surface in the thickness direction and a side of the second electrode lead-out member departing from the second exposed surface in the thickness direction are both sealed inside the packaging bag, the first heat insulating member can reduce the heat transfer coefficient between the first electrode lead-out member and the electrolyte contained inside the packaging bag, the second heat insulating member can reduce the heat transfer coefficient between the second electrode lead-out member and the electrolyte contained inside the packaging bag, when the first electrode lead-out member is welded with an external component and the second electrode lead-out member is welded with an external component, the heat of the first electrode lead-out member and the heat of the second electrode lead-out member are less transferred to the electrolyte contained inside the packaging bag, thereby reducing the adverse effect on the electrolyte in the above-mentioned process and avoiding the burr of the first electrode lead-out member and the second electrode lead-out member from piercing the packaging bag, therefore, the battery cell has better safety performance in the process of assembling with external parts.

According to some embodiments of the present application, the electrode assembly includes a main body, a first tab and a second tab, the first tab and the second tab all follow the main body extends out, the first electrode draws away one side of piece that deviates from the first exposed surface with first tab welded connection, the second electrode draws away one side of piece that deviates from the second exposed surface with second tab welded connection.

In the above scheme, one side of the first electrode leading-out piece comprises a first exposed surface, the other side of the first electrode leading-out piece is in welding connection with the first tab, one side of the second electrode leading-out piece comprises a second exposed surface, the other side of the second electrode leading-out piece is in welding connection with the second tab, and the smoothness integrality of the first exposed surface and the second exposed surface can be guaranteed in the welding connection process of the electrode assembly, the first exposed surface and the second exposed surface, so that the first exposed surface and the second exposed surface can be reliably welded with external parts, and the single battery has better safety performance in the assembling process of the single battery and external parts.

According to some embodiments of the present application, along the thickness direction of the battery cell, the projection of the main body is spaced apart from the projection of the first electrode lead-out member by an interval of less than or equal to 1mm, and the projection of the main body is spaced apart from the projection of the second electrode lead-out member by an interval of less than or equal to 1 mm.

In the above scheme, the distance between the first electrode lead-out piece and the main body and the distance between the second electrode lead-out piece and the main body are less than or equal to 1mm, so that the outer size of the battery cell can be reduced, and the energy density of the battery cell is improved.

According to some embodiments of the present application, the first electrode lead-out member and the second electrode lead-out member are located at the same side or opposite sides of the battery cell.

In the above scheme, the first electrode leading-out piece and the second electrode leading-out piece can be located on the same side of the single battery, so that the possibility of short circuit of the first electrode leading-out piece and the second electrode leading-out piece caused by self deformation of the single battery or overlapping of foreign matters and the like is reduced; the first electrode lead-out piece and the second electrode lead-out piece can be located on two opposite sides of the single battery, and the possibility that the first electrode lead-out piece and the second electrode lead-out piece are short-circuited due to overlapping of foreign matters is reduced.

According to some embodiments of the present application, a thickness direction of the first electrode lead-out member and a thickness direction of the second electrode lead-out member are both parallel to a thickness direction of the battery cell.

In the above scheme, the thickness direction of the first electrode leading-out piece and the thickness direction of the second electrode leading-out piece are both parallel to the thickness direction of the single battery, so that the increase of the outer size of the single battery in the thickness direction caused by the first electrode leading-out piece and the second electrode leading-out piece can be avoided, the single battery is compact in structure, and the energy density is high.

In a second aspect of the present application, a battery is provided, which includes the battery cell described in the first aspect of the present application.

Because the battery cell of the embodiment of the first aspect of the present application has better safety performance in the assembling process, the battery of the embodiment of the second aspect of the present application also has better safety performance.

In an embodiment of the third aspect of the present application, an electric device is provided, which includes the battery of the embodiment of the second aspect of the present application, and the battery is used for providing electric energy.

Because the battery of the embodiment of the second aspect of the present application has better safety performance, the electric device of the embodiment of the third aspect of the present application also has better safety performance.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 illustrates a simplified schematic diagram of a vehicle in an embodiment of the present application;

FIG. 2 is a schematic diagram of the battery of the vehicle of FIG. 1;

FIG. 3 illustrates a schematic structural view of a first form of battery cell of some embodiments of the present application;

FIG. 4 illustrates a schematic diagram of a second form of battery cell in accordance with certain embodiments of the present application;

FIG. 5 shows a cross-sectional view A-A of FIG. 3;

FIG. 6 shows a cross-sectional view B-B of FIG. 3;

FIG. 7 shows an enlarged view of a portion of FIG. 5 at C;

FIG. 8 shows an enlarged view of a portion of FIG. 6 at D;

FIG. 9 illustrates a schematic structural diagram of a third form of battery cell of some embodiments of the present application;

fig. 10 shows a cross-sectional view associated with the first electrode lead-out member in the battery cell of fig. 9;

fig. 11 shows a cross-sectional view associated with a second electrode lead-out member in the battery cell of fig. 9;

fig. 12 is a schematic structural view showing the first sealing member and the second sealing member in the battery cell shown in fig. 9;

fig. 13 is a schematic view showing the first electrode lead-out member of the battery cell shown in fig. 3 engaged with the first sealing member;

fig. 14 is a schematic view showing the first electrode lead-out member of the battery cell shown in fig. 9 engaged with a first sealing member;

fig. 15 is a schematic view of a battery cell embodying a first electrode lead-out member coupled to a first thermal insulating member according to some embodiments of the present application;

the figures are not provided to scale.

Icon: 1000-a vehicle; 100-a battery; 10-a battery cell; 11-packaging the bag; 111-a first packaging film; 1111-a first opening; 1112-a first body; 1113-a first extension; 112-a second packaging film; 1121 — a second opening; 1122-a second body; 1123-a second extension; 12-an electrode assembly; 121-a body; 122 — a first tab; 123-a second tab; 13-a first electrode lead-out; 131-a first bare surface; 132-a first surface; 1321-first part; 1322-a second portion; 133-a first side; 134-a first side; 135-third side; 14-a second electrode lead-out; 141-a second bare surface; 142-a second surface; 143-a second side; 15-a first seal; 16-a second seal; 17-a first insulation; 20-a box body; 21-a first sub-tank; 22-a second sub-tank; 200-a controller; 300-motor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Throughout the description of the present application, it is to be noted that unless otherwise expressly specified or limited the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The appearances of "a plurality" in this application are intended to mean more than two (including two).

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector, the positive pole current collector which is not coated with the positive pole active substance layer protrudes out of the positive pole current collector which is coated with the positive pole active substance layer, and the positive pole current collector which is not coated with the positive pole active substance layer is used as a positive pole lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the diaphragm may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery monomer also comprises two electrode leading-out parts with different polarities, the electrode assembly is connected with the two electrode leading-out parts, and electric energy is transmitted to the outside of the battery monomer through the electrode leading-out parts; the plurality of battery cells are electrically connected through the confluence part so as to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells.

In the related art, in the process of transferring the battery cells and the process of assembling and molding the battery using the battery cells, since conductive foreign matters such as metal are simultaneously in contact with the two electrode lead-out members, the two electrode lead-out members are also short-circuited. If two electrode leading-out pieces with different polarities of the single battery are in short circuit, short circuit can be caused inside the single battery, and the single battery is scrapped.

The inventor researches and discovers that in a common battery cell, the surfaces of two electrode leading-out parts with different polarities are not subjected to insulation treatment, and as long as the two electrode leading-out parts are directly or indirectly in conductive connection, short circuit is inevitably caused. If the surface of the electrode leading-out piece is subjected to insulation treatment, part of the surface of the electrode leading-out piece is exposed, when the two electrode leading-out pieces are contacted with each other at one side, or when conductive foreign matters connect the same sides of the two electrode leading-out pieces, as long as the exposed surfaces of the two electrode leading-out pieces are kept insulated and isolated, the two electrode leading-out pieces cannot be short-circuited, and further the short circuit inside a battery monomer cannot be caused.

Based on the above thinking, this application provides a new technical scheme, the battery monomer includes that first electrode draws forth piece and second electrode and draws forth the piece, the polarity that first electrode drawn forth piece and second electrode drawn forth piece is opposite, the orientation of the exposed face that first electrode drawn forth piece and second electrode drawn forth piece is opposite, can avoid the exposed face that first electrode drawn forth piece and second electrode drawn forth piece to the greatest extent when piece is drawn forth to first electrode and second electrode directly or indirectly contact short circuit, and then reduced battery monomer and electrically conductive foreign matter overlap joint and lead to the inside possibility that takes place the short circuit of battery monomer, the in-process of transferring the battery monomer and the free security performance of the in-process battery of battery monomer equipment shaping battery have been improved.

It can be understood that the battery cell described in the embodiments of the present application may directly supply power to an electric device, or may form a battery in parallel or in series, so as to supply power to various electric devices in the form of a battery.

It is to be understood that the electric device using the battery cell or the battery described in the embodiments of the present application may be applied to various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, and the like, an electric toy including a stationary type or a mobile type electric toy, for example, a game machine, an electric car toy, an electric ship toy, an electric plane toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.

The battery cell and the battery described in the embodiments of the present application are not limited to be applied to the above-described electric devices, but may be applied to all electric devices using the battery cell and the battery.

FIG. 1 illustrates a simplified schematic diagram of a vehicle in an embodiment of the present application; fig. 2 shows a schematic diagram of the battery of the vehicle in fig. 1.

As shown in fig. 1 and 2, a battery 100, a controller 200, and a motor 300 are provided inside a vehicle 1000, and the battery 100 may be provided, for example, at the bottom or the head or tail of the vehicle 1000. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc.

In some embodiments of the present application, battery 100 may be used for power supply of vehicle 1000, for example, battery 100 may be used as an operating power source of vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for operation power demand at the start, navigation, and traveling of the vehicle 1000.

In other embodiments, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1000.

Here, the battery 100 referred to in the embodiments of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 is formed by connecting a plurality of battery cells 10 in series or in parallel.

As shown in fig. 2, the battery 100 includes a plurality of battery cells 10 and a case 20, and the plurality of battery cells 10 are placed in the case 20. The box body 20 comprises a first sub-box body 21 and a second sub-box body 22, the first sub-box body 21 and the second sub-box body 22 are mutually covered to form a battery cavity, and the plurality of battery monomers 10 are placed in the battery cavity. Wherein, the shape of the first sub-case 21 and the second sub-case 22 may be determined according to the shape of the combination of the plurality of battery cells 10, and the first sub-case 21 and the second sub-case 22 may each have one opening. For example, each of the first sub-case 21 and the second sub-case 22 may be a hollow rectangular parallelepiped and only one surface of each of the first sub-case 21 and the second sub-case 22 is an opening surface, the openings of the first sub-case 21 and the second sub-case 22 are oppositely disposed, and the first sub-case 21 and the second sub-case 22 are fastened to each other to form the case 20 having a closed chamber. The plurality of battery cells 10 are connected in parallel or in series-parallel combination and then placed in the case 20 formed by buckling the first sub-case 21 and the second sub-case 22.

FIG. 3 illustrates a schematic diagram of a first form of battery cell of some embodiments of the present application; FIG. 4 illustrates a schematic structural diagram of a battery cell of a second form of some embodiments of the present application; FIG. 5 shows a cross-sectional view A-A of FIG. 3; fig. 6 shows a cross-sectional view B-B of fig. 3.

As shown in fig. 3, 4, 5, and 6, in some embodiments of the present application, the battery cell 10 is a pouch battery, and the battery cell 10 includes a packaging bag 11, an electrode assembly 12, a first electrode lead-out member 13, and a second electrode lead-out member 14, and polarities of the first electrode lead-out member 13 and the second electrode lead-out member 14 are opposite.

The electrode assembly 12 is disposed inside the package bag 11, the electrode assembly 12 includes a main body 121, a first tab 122 and a second tab 123, the polarities of the first tab 122 and the second tab 123 are opposite, the first tab 122 and the second tab 123 both extend from the main body 121, the first electrode lead-out member 13 is welded to the first tab 122, and the second electrode lead-out member 14 is welded to the second tab 123. The main body 121 includes a positive electrode plate, a negative electrode plate, and a diaphragm located between the positive electrode plate and the negative electrode plate for separating the positive electrode plate from the negative electrode plate. For example, the first tab 122 is a positive tab, the second tab 123 is a negative tab, the first electrode lead 13 is a positive electrode lead, and the second electrode lead 14 is a negative electrode lead. The first electrode lead-out member 13 is made of aluminum, and the second electrode lead-out member 14 is made of copper. The first tab 122 is disposed and electrically connected to the first electrode lead-out member 13 on the same side, and the second tab 123 is disposed and electrically connected to the second electrode lead-out member 14 on the same side.

It will be appreciated that the first tab 122 may be directly or indirectly connected to the first electrode lead-out 13 and the second tab 123 may be directly or indirectly connected to the second electrode lead-out 14. Taking the first tab 122 and the first electrode lead-out member 13 as an example, the first tab 122 and the first electrode lead-out member 13 may be directly connected, for example, by laser welding or ultrasonic welding; the first tab 122 and the first electrode lead-out 13 can also be connected indirectly via an adapter, for example via a current collecting member.

As shown in fig. 3, in some embodiments of the present application, the first and second tabs 122 and 123 are located on the same side of the electrode assembly 12, and the first and second electrode lead- outs 13 and 14 are located on the same side of the battery cell 10. For example, the first and second tabs 122 and 123 are located on the same side of the electrode assembly 12 and the first and second electrode lead- outs 13 and 14 are located on the same side of the battery cell 10 along the third direction Z.

In other embodiments of the present application, as shown in fig. 4, the first and second tabs 122 and 123 are located at opposite sides of the electrode assembly 12, and the first and second electrode lead- outs 13 and 14 are located at opposite sides of the battery cell 10. For example, the first and second tabs 122 and 123 are located at opposite sides of the electrode assembly 12, and the first and second electrode lead- outs 13 and 14 are located at opposite sides of the battery cell 10 along the third direction Z.

The shape of the package bag 11 may be a square shape or other shapes, and the interior of the package bag 11 forms a receiving cavity for receiving the electrode assembly 12 and the electrolyte. The outer packaging film is made of an aluminum plastic film.

In some embodiments of the present application, the bag 11 has a square shape, and the width direction of the bag 11 extends along a first direction X, the thickness direction extends along a second direction Y, and the length direction extends along a third direction Z. The first direction X, the second direction Y and the third direction Z are vertical to each other. In other embodiments, the package 11 may have other shapes.

As shown in fig. 5 and 6, the package bag 11 includes a first package film 111 and a second package film 112, and edges of the first package film 111 and the second package film 112 are connected by a heat-seal welding process to enclose the electrode assembly 12 in the receiving cavity and expose at least portions of surfaces of the first electrode lead-out 13 and the second electrode lead-out 14.

In other embodiments, the battery cell 10 may also be a hard-shell battery, the battery cell 10 includes a hard case, the electrode assembly 12 and the electrolyte are located inside the hard case, and the first electrode lead 13 and the second electrode lead 14 extend outside the case.

As shown in fig. 3, 5, and 6, some embodiments of the present application provide a battery cell 10 including a first electrode lead-out 13 and a second electrode lead-out 14, only one of two surfaces of the first electrode lead-out 13 in a thickness direction includes a first exposed surface 131, the second electrode lead-out 14 is opposite in polarity to the first electrode lead-out 13, and only one of two surfaces of the second electrode lead-out 14 in the thickness direction includes a second exposed surface 141. Wherein the first exposed face 131 is oriented opposite to the second exposed face 141.

The first exposed surface 131 refers to a surface on which a portion of the surface of the first electrode lead-out member 13 is not insulated and is exposed to the outside of the package bag 11 so as to be electrically connected to the corresponding bus bar member; the second exposed surface 141 refers to a surface on which a portion of the surface of the second electrode lead-out member 14 is not insulated and is exposed to the outside of the package bag 11 to enable electrical connection with the corresponding bus bar member.

As shown in fig. 5 and 6, specifically, one surface in the thickness direction of the first electrode lead-out 13 includes a first exposed surface 131, one surface in the thickness direction of the second electrode lead-out 14 includes a second exposed surface 141, and the first exposed surface 131 and the second exposed surface 141 are oppositely oriented. It is understood that one surface of the first electrode lead-out member 13 in the thickness direction may be the first exposed surface 131 entirely or may be a part of the first exposed surface 131; the entire surface of the second electrode lead-out member 14 in the thickness direction may be the second exposed surface 141, or a part thereof may be the second exposed surface 141.

The first exposed surface 131 and the second exposed surface 141 are oppositely oriented, that is, the first exposed surface 131 and the second exposed surface 141 may be arranged in parallel or inclined approximately in parallel, and the first exposed surface 131 and the second exposed surface 141 are respectively oppositely oriented along a straight line direction.

The first electrode lead-out member 13 and the second electrode lead-out member 14 may be located on the same side of the battery cell 10, or may be located on opposite sides of the battery cell 10; the first electrode lead-out member 13 and the second electrode lead-out member 14 may be externally disposed out of the packaging bag 11 or internally disposed in the packaging bag 11.

The first and second electrode lead- outs 13 and 14 may have only the first and second exposed surfaces 131 and 141 exposed to the outside of the envelope 11 and the remaining surfaces sealed inside the envelope 11; the first and second electrode lead- outs 13 and 14 may be exposed to the outside of the package bag 11 at the same time as the first and second exposed surfaces 131 and 141 are exposed to the outside of the package bag 11, and the remaining surfaces are exposed to the outside of the package bag 11 and subjected to an insulation protection process.

The thickness direction of the first electrode lead-out member 13 and the thickness direction of the second electrode lead-out member 14 may be provided in the same direction, or may be inclined in approximately the same direction. In some embodiments of the present application, the thickness direction of the first electrode lead-out member 13 and the thickness direction of the second electrode lead-out member 14 are disposed in the same direction; for example, the thickness directions of the first and second electrode lead- outs 13 and 14 each extend in the second direction Y in which the first and second exposed surfaces 131 and 141 are oriented oppositely. In other embodiments, the included angle between the first electrode lead-out member 13 and the second electrode lead-out member 14 may be an obtuse angle such as 150 °, and the thickness directions of the first electrode lead-out member 13 and the second electrode lead-out member 14 are obliquely arranged approximately in the same direction.

In the process of assembling the single battery 10 according to the embodiment of the present application, since the orientation of the first exposed surface 131 is opposite to the orientation of the second exposed surface 141, when the first electrode lead-out member 13 and the second electrode lead-out member 14 are directly or indirectly in contact, the possibility that the first exposed surface 131 and the second exposed surface 141 are in contact is low, so that the possibility that the short circuit occurs inside the single battery 100 due to the short circuit of the first electrode lead-out member 13 and the second electrode lead-out member 14 is reduced, and the single battery 10 has good safety performance in the assembling process.

In some embodiments of the present application, the battery cell 10 further includes a packaging bag 11 and an electrode assembly 12, and the electrode assembly 12 is accommodated in the packaging bag 11. Wherein the first electrode lead-out 13 and the second electrode lead-out 14 are electrically connected to the electrode assembly 12, and the surface of the first electrode lead-out 13 facing away from the first exposed surface 131 in the thickness direction is covered with the packaging bag 11; the surface of the second electrode lead-out member 14 facing away from the second exposed surface 141 in the thickness direction is covered with the packaging bag 11.

It can be understood that, based on the foregoing embodiment in which the battery cell 10 is a pouch battery, the battery cell 10 may deform, and thus two electrode leads of different polarities of the battery cell 10 may be shorted. In the single battery 10 of the embodiment of the present application, the first exposed surface 131 and the second exposed surface 141 are opposite in orientation, and the possibility that the first exposed surface 131 and the second exposed surface 141 are in direct contact due to the deformation of the single battery 10 itself can also be reduced.

FIG. 7 shows an enlarged view of a portion of FIG. 5 at C; fig. 8 shows a partial enlarged view at D in fig. 6.

As shown in fig. 7, the first electrode lead-out member 13 further includes a first surface 132 and a first side surface 133, the first surface 132 is located at the other side of the first exposed surface 131 along the thickness direction (i.e., the second direction Y) of the first electrode lead-out member 13, and the first side surface 133 connects the first surface 132 and the first exposed surface 131. As shown in fig. 8, the second electrode lead 14 further includes a second surface 142 and a second side surface 143, the second surface 142 is located at the other side of the second exposed surface 141 along the thickness direction (i.e., the second direction Y) of the second electrode lead 14, and the second side surface 143 connects the second surface 142 and the second exposed surface 141.

Specifically, the first exposed surface 131 and the second exposed surface 141 are exposed, and the first surface 132 and the second surface 142 are covered with the packing bag 11. The first surface 132 and the second surface 142 may face the receiving cavity inside the packing bag 11 and contact the electrolyte; the first surface 132 and the second surface 142 may also be covered by a surface of the package 11 outside the receiving cavity.

In the above-mentioned aspect, the first surface 132 of the first electrode lead-out member 13 and the second surface 142 of the second electrode lead-out member 14 are both covered by the packaging bag 11, and when the first electrode lead-out member 13 and the second electrode lead-out member 14 are in direct or indirect contact, the first exposed surface 131 may be in contact with the surface of the packaging bag 11, and the second exposed surface 141 may be in contact with the surface of the packaging bag 11, so that the possibility of contact between the first exposed surface 131 and the second exposed surface 141 is reduced, and the possibility of short circuit of the battery cell 10 due to short circuit of the first electrode lead-out member 13 and the second electrode lead-out member 14 is reduced.

FIG. 9 illustrates a schematic structural diagram of a third form of battery cell of some embodiments of the present application; fig. 10 shows a cross-sectional view associated with the first electrode lead-out member in the battery cell of fig. 9; fig. 11 is a sectional view showing the second electrode lead-out member in the battery cell of fig. 9.

As shown in fig. 9, 10 and 11, in some embodiments of the present application, the package bag 11 includes a first package film 111 and a second package film 112, the electrode assembly 12 is disposed between the first package film 111 and the second package film 112, the first package film 111 is formed with a first opening 1111 from which the first exposed surface 131 is exposed, the second package film 112 is formed with a second opening 1121, and the second exposed surface 141 is exposed from the second opening 1121.

The shape of each exposed surface and the corresponding opening can be the same or different. Taking the first opening 1111 and the first exposed surface 131 as an example, in some embodiments of the present disclosure, the shape of the first opening 1111 corresponds to the shape of the first exposed surface 131, and the first exposed surface 131 is exposed from the first opening 1111; for example, the first exposed surface 131 is rectangular, the first opening 1111 is also rectangular, and for example, the first exposed surface 131 is circular, and the first opening 1111 is also circular. In other embodiments, the shape of the first opening 1111 may be different from the shape of the first exposed surface 131, for example, the first opening 1111 is circular and the first exposed surface 131 is rectangular.

The first electrode lead-out member 13 and the second electrode lead-out member 14 may be the same in shape or different in shape; the first exposed surface 131 and the second exposed surface 141 may have the same shape or different shapes; the first opening 1111 and the second opening 1121 may have the same shape or different shapes. In some embodiments of the present application, the first and second electrode lead- outs 13 and 14 are identical in shape and are each a thin plate structure, the first and second exposed surfaces 131 and 141 are identical in shape and are each a rectangle, and the first and second openings 1111 and 1121 are identical in shape and are each a rectangle.

As shown in fig. 10 and 11, the first opening 1111 and the second opening 1121 are oriented oppositely along the thickness direction (i.e., the second direction Y) of the packing bag 11. The first opening 1111 and the second opening 1121 may be spaced apart along the width direction (i.e., the first direction X) of the packing bag 11, and the first opening 1111 and the second opening 1121 may also be spaced apart along the length direction (i.e., the third direction Z) of the packing bag 11.

On the XY plane, the projection of the first electrode lead-out 13 falls within the projection of the second packaging film 112, and the projection of the second electrode lead-out 14 falls within the projection of the first packaging film 111. That is, the portion between the first electrode lead-out member 13 and the second electrode lead-out member 14 is filled with the electrolyte to increase the volume of the receiving cavity of the packing bag 11 and increase the capacity of the battery cell 10.

In the above-described aspect, the first exposed surface 131 and the second exposed surface 141 are exposed from the first opening 1111 and the second opening 1121 of the packaging bag 11, respectively, and on one hand, the packaging bag 11 of this form has a simple structure, and can simplify the assembly process of the battery cell 10 and reduce the manufacturing cost of the battery cell 10; on the other hand, the first surface 132 of the first electrode lead-out member 13 and the second surface 142 of the second electrode lead-out member 14 are both sealed inside the packaging bag 11, increasing the internal space of the packaging bag 11, increasing the capacity of the electrolyte that can be contained in the packaging bag 11, and increasing the capacity of the battery cell 10.

As shown in fig. 3, 5, 6, 7 and 8, in some embodiments of the present disclosure, the package bag 11 includes a first package film 111 and a second package film 112, the first package film 111 includes a first body 1112 and a first extension 1113 extending from an edge of the first body 1112, the second package film 112 includes a second body 1122 and a second extension 1123 extending from an edge of the second body 1122, the electrode assembly 12 is disposed between the first body 1112 and the second body 1122, a surface of the first electrode lead-out member 13 facing away from the first exposed surface 131 in a thickness direction is covered by the first extension 1113, and a surface of the second electrode lead-out member 14 facing away from the second exposed surface 141 in a thickness direction is covered by the second extension 1123.

Specifically, the first body 1112 and the second body 1122 are square, and the edges of the first body 1112 and the second body 1122 are heat sealed, so that the accommodating cavities are formed while corresponding openings are left at the first extension 1113 and the second extension 1123. The first electrode lead 13 extends out of the envelope 11 from the opening corresponding to the first extension 1113, and the second electrode lead 14 extends out of the envelope 11 from the opening corresponding to the second extension 1123.

The first extension 1113 has a shape corresponding to a portion of the first surface 132 exposing the envelope 11, a portion of the first surface 132 of the first electrode lead-out 13 exposing the envelope 11 is covered by the first extension 1113, the second extension 1123 has a shape corresponding to a portion of the second surface 142 exposing the envelope 11, and a portion of the second surface 142 of the second electrode lead-out 14 exposing the envelope 11 is covered by the second extension 1123. It is understood that the first surface 132 and the second surface 142 may completely expose the package 11 or partially expose the package 11.

The electrode assembly 12 is disposed between the first body 1112 and the second body 1122 means that a projection of the electrode assembly 12 on the XZ plane falls within a projection range of the first body 1112 and the second body 1122.

In the above-described aspect, the first and second electrode lead- outs 13 and 14 expose the outside of the first and second bodies 1112 and 1122 from the sealing edges of the first and second packaging films 111 and 112, facilitating molding of the battery cell 10. The first surface 132 of the first electrode lead-out member 13 is covered by the first extending portion 1113, the second surface 142 of the second electrode lead-out member 14 is covered by the second extending portion 1123, and both the first exposed surface 131 and the second exposed surface 141 are exposed outside the first body 1112 and the second body 1122, so that the first electrode lead-out member 13 and the second electrode lead-out member 14 can be conveniently connected with external components, and the assembly process of the battery cell 10 and other components is simplified.

In other embodiments, an additional insulating film or an insulating coating layer may be used instead of the first extension 1113 and the second extension 1123 to achieve the insulating protection of the portion of the first surface 132 exposing the packaging bag 11 and the portion of the second surface 142 exposing the packaging bag 11.

Fig. 12 is a schematic structural view illustrating the first sealing member and the second sealing member in the battery cell shown in fig. 9.

As shown in fig. 12, in some embodiments of the present application, the battery cell 10 further includes a first sealing member 15 and a second sealing member 16, the first sealing member 15 sealing a gap between the edge of the first electrode lead-out 13 and the packaging bag 11, and the second sealing member 16 sealing a gap between the edge of the second electrode lead-out 14 and the packaging bag 11.

The first sealing member 15 and the second sealing member 16 may be independent sealing members, such as a sealing ring and a sealing strip, for example, the first sealing member 15 may be assembled with the first electrode lead-out member 13 or one of the packaging bags 11, and then the integrally assembled assembly may be connected to the other one of the first sealing member 15 and the first electrode lead-out member 13 to seal a gap between the edge of the first electrode lead-out member 13 and the packaging bag 11. The first sealing member 15 and the second sealing member 16 may be formed by curing a liquid sealant, and for example, the first sealing member 15 is first assembled with the package bag 11, and then the sealant is filled between the first electrode lead-out member 13 and the package bag 11, so as to seal a gap between an edge of the first electrode lead-out member 13 and the package bag 11.

The edges of the first electrode lead-out member 13 and the second electrode lead-out member 14 are specifically arranged according to the manner of assembling the first electrode lead-out member 13 and the second electrode lead-out member 14 with the packaging bag 11. Taking the first electrode lead-out member 13 as an example, the edge of the first electrode lead-out member 13 means a portion of the first side 133 and the first surface 132 of the first electrode lead-out member 13 corresponding to the opening of the package bag 11.

In the above scheme, the first sealing member 15 can seal a gap between the edge of the first electrode lead-out member 13 and the packaging bag 11, and the second sealing member 16 can seal a gap between the edge of the second electrode lead-out member 14 and the packaging bag 11, so that the first exposed surface 131 and the second exposed surface 141 of the packaging bag 11 are exposed, and a closed space is formed, thereby preventing the electrolyte in the packaging bag 11 from leaking, and thus the single battery 10 still has good safety performance and capacitance after being used for a long time.

In some embodiments of the present application, the first sealing member 15 and the second sealing member 16 are both sealing glue, the first electrode lead-out member 13 is connected to the packaging bag 11 through the first sealing member 15, and the second electrode lead-out member 14 is connected to the packaging bag 11 through the second sealing member 16.

As a preferable embodiment, in the embodiment in which the battery cell 10 is a pouch battery, the first sealing member 15 and the second sealing member 16 are both sealing members, and a gap between the first electrode lead-out member 13 and the packaging bag 11 and a gap between the second electrode lead-out member 14 and the packaging bag can be reliably sealed.

Filling a sealant between the gap between the edge of the first sealing element 15 and the edge of the first opening 1111, and curing the sealant to form the first sealing element 15; the gap between the edge of the second sealing member 16 and the edge of the second opening 1121 is filled with a sealant, and the sealant is cured to form the second sealing member 16.

In the above-described aspect, the first sealing member 15 and the second sealing member 16 are formed in a simple manner, at low cost, and can reliably seal the gap between the edge of the first electrode lead-out member 13 and the package bag 11 and the gap between the edge of the second electrode lead-out member 14 and the package bag 11.

In some embodiments of the present application, the first sealing member 15 is provided in one turn along the edge of the first electrode lead-out 13, and the second sealing member 16 is provided in one turn along the edge of the second electrode lead-out 14.

The first sealing member 15 seals the gap between the first electrode lead-out member 13 and the package bag 11 in the same manner as the second sealing member 16 seals the gap between the second electrode lead-out member 14 and the package bag 11, and the first sealing member 15 is used as an example to describe the sealing manner between the first electrode lead-out member 13 and the package bag 11 in detail.

Fig. 13 is a schematic view showing the first electrode lead-out member of the battery cell shown in fig. 3 engaged with the first sealing member; fig. 14 is a schematic view illustrating the first electrode lead-out member of the battery cell shown in fig. 9 being coupled with a first sealing member.

Based on the aforementioned embodiment of covering the portion of the first surface 132 exposing the package bag 11 by using the first extension 1113, the edge of the first electrode lead-out 13 is the first side 133 and the edge of the portion of the first surface 132 exposing the package bag 11. As shown in fig. 13, as a preferable embodiment, the first electrode lead-out member 13 includes a first side 134, a second side (not shown), a third side 135 and a fourth side (not shown), the first side 134 and the third side 135 are oppositely disposed along the third direction Z, the second side and the fourth side are oppositely disposed along the first direction X, the first side 134 of the first side 134 and the third side 135 is disposed near the main body 121; the first sealing member 15 fills a gap between the first side 133 and the edge of the second packaging film 112 at the first side 134, and the first sealing member 15 fills a gap between the first surface 132 and the edge of the first extension 1113 at the second, third, and fourth sides. With this sealing form, the surface of the first exposed surface 131 can be made smooth, facilitating welding of the first exposed surface 131 with a corresponding bus bar member.

Based on the aforementioned embodiment in which the first exposed surface 131 exposes the packaging bag 11 from the first opening 1111, the edge of the first electrode lead-out member 13 is the first side surface 133 and the edge of the first exposed surface 131. As shown in fig. 14, as a preferred embodiment, the edge of the first exposed surface 131 includes an adhesive surface, and the first sealing member 15 seals a gap between the adhesive surface of the edge of the first exposed surface 131 and the inner surface of the first opening 1111 of the first packaging film 111, so that the first electrode lead-out member 13 of the packaging bag 11 can be completely covered by the first electrode lead-out member 13 in the thickness direction (i.e., the second direction Y), and the size of the first electrode lead-out member 13 protruding from the outer surface of the first packaging film 111 is reduced, thereby making the structure of the battery cell 10 compact.

In the above-described aspect, the first sealing member 15 circumferentially seals the gap between the edge of the first electrode lead-out 13 and the package bag 11, and the second sealing member 16 circumferentially seals the gap between the edge of the second electrode lead-out 14 and the package bag 11, so as to reliably achieve the formation of a closed space while exposing the exposed surfaces of the first electrode lead-out 13 and the second electrode lead-out 14 of the package bag 11.

Fig. 15 is a schematic view of a battery cell according to some embodiments of the present disclosure in which a first electrode lead-out member is coupled to a first thermal insulating member.

As shown in fig. 15, in some embodiments of the present application, the battery cell 10 further includes a first heat insulating member 17 and a second heat insulating member (not shown), the first heat insulating member 17 covering a side of the first electrode lead-out member 13 facing away from the first exposed surface 131 in a thickness direction; the second heat insulating member covers a side (not shown) of the second electrode lead-out member 14 facing away from the second exposed face 141 in the thickness direction.

Specifically, the first heat insulator 17 covers the first surface 132 of the first electrode lead-out member 13, and the second heat insulator covers the second surface 142 of the second electrode lead-out member 14. The first heat insulating material 17 and the second heat insulating material are made of a common insulating film.

In the above-described aspect, the side of the first electrode lead-out member 13 facing away from the first exposed surface 131 in the thickness direction and the side of the second electrode lead-out member 14 facing away from the second exposed surface 141 in the thickness direction are both sealed inside the packaging bag 11, the first heat insulator 17 can reduce the heat transfer coefficient between the first electrode lead-out member 13 and the electrolyte contained inside the packaging bag 11, the second heat insulator can reduce the heat transfer coefficient between the second electrode lead-out member 14 and the electrolyte contained inside the packaging bag 11, when the first electrode lead-out member 13 is welded to an external component and the second electrode lead-out member 14 is welded to an external component, the heat of the first electrode lead-out member 13 and the heat of the second electrode lead-out member 14 are less transferred to the electrolyte contained inside the packaging bag 11, the adverse effect on the electrolyte in the above-mentioned process is reduced, and the piercing burr 11 of the first electrode lead-out member 13 and the second electrode lead-out member 14 can be avoided, thereby providing the battery 100 with better safety during the assembly process with the external parts.

As shown in fig. 9, 10 and 11, in some embodiments of the present application, the electrode assembly 12 includes a main body 121, a first tab 122 and a second tab 123, both the first tab 122 and the second tab 123 extend from the main body 121, a side of the first electrode lead 13 facing away from the first exposed surface 131 is welded to the first tab 122, and a side of the second electrode lead 14 facing away from the second exposed surface 141 is welded to the second tab 123.

Specifically, the first surface 132 of the first electrode lead-out member 13 is welded to the first tab 122, and the second surface 142 of the second electrode lead-out member 14 is welded to the second tab 123.

As shown in fig. 15, taking the welding of the first electrode lead-out 13 to the first tab 122 as an example, the first surface 132 includes a first portion 1321 and a second portion 1322, the first portion 1321 and the second portion 1322 are spaced apart along the third direction Z, and the first portion 1321 is disposed adjacent to the main body 121 and is welded to the first tab 122. Based on the aforementioned embodiment that the first thermal insulation member 17 covers the first surface 132, the first thermal insulation member 17 covers the first tab 122 at the first portion 1321 and is directly attached to the first surface 132 at the second portion 1322.

In the above-mentioned scheme, one side of the first electrode lead-out member 13 includes the first exposed surface 131, the other side is welded to the first tab 122, one side of the second electrode lead-out member 14 includes the second exposed surface 141, and the other side is welded to the second tab 123, so that the smooth integrity of the first exposed surface 131 and the second exposed surface 141 can be ensured during the welding of the electrode assembly 12 to the first electrode lead-out member 13 and the second electrode lead-out member 14, so as to ensure that the first exposed surface 131 and the second exposed surface 141 can be reliably welded to external components, thereby ensuring that the battery 100 is well safe during the assembly with external components.

In some embodiments of the present application, along the thickness direction of the battery cell 10, the projection of the main body 121 is spaced apart from the projection of the first electrode lead-out member 13 by 1mm or less, and the projection of the main body 121 is spaced apart from the projection of the second electrode lead-out member 14 by 1mm or less.

As shown in fig. 3, in some embodiments of the present application, the first electrode lead-out member 13 and the second electrode lead-out member 14 are disposed on the same side of the battery cell 10 along the third direction Z, and the projection of the main body 121 and the first electrode lead-out member 13 does not overlap on the XZ plane. As shown in fig. 7 and 8, the distance between the main body 121 and the projection of the first electrode lead-out member 13 along the third direction Z is D1, D1 ≦ 1 mm; the projections of the main body 121 and the second electrode lead-out piece 14 are not overlapped, and the distance between the projections of the main body 121 and the second electrode lead-out piece 14 along the third direction is D2, and D2 is less than or equal to 1 mm.

In other embodiments of the present application, a distance between the body 121 and the first electrode lead-out 13, and a projection of the body 121 and the second electrode lead-out 14 in other directions may be less than or equal to 1mm, based on the positions of the first electrode lead-out 13 and the second electrode lead-out 14.

In the above-described aspect, the distance between the first and second electrode lead- outs 13 and 14 and the main body 121 is less than or equal to 1mm, the outer size of the battery cell 10 can be reduced, thereby improving the energy density of the battery cell 10.

In some embodiments of the present application, the first electrode lead-out member 13 and the second electrode lead-out member 14 are located at the same side or opposite sides of the battery cell 10.

As shown in fig. 3, 7, 8, 9, 10 and 11, based on the aforementioned embodiment in which the first electrode lead-out member 13 and the second electrode lead-out member 14 are located on the same side of the battery cell 10, the first exposed surface 131 and the second exposed surface 141 are oppositely oriented in the second direction Y and are spaced apart in the first direction X, and when the battery cell 10 deforms itself to cause the first electrode lead-out member 13 and the second electrode lead-out member 14 to approach each other in the first direction X to be in contact, the first exposed surface 131 and the second exposed surface 141 are less likely to be in contact; when the conductive foreign matter is brought into contact with the battery cell 10 from one side thereof, it may be brought into contact with both the first surface 132 and the second exposed surface 141, or both the second surface 142 and the first exposed surface 131, so that there is less possibility of conductively connecting the first exposed surface 131 and the second exposed surface 141.

As shown in fig. 4, based on the embodiment in which the first electrode lead-out member 13 and the second electrode lead-out member 14 are located at two opposite sides of the battery cell 10, when conductive foreign matter is in contact with the battery cell 10 from one side thereof, referring to the embodiment in which the first electrode lead-out member 13 and the second electrode lead-out member 14 are arranged at the same side, the first electrode lead-out member 13 and the second electrode lead-out member 14 are less likely to be shorted.

In the above scheme, the first electrode lead-out member 13 and the second electrode lead-out member 14 may be located on the same side of the single battery 10, so as to reduce the possibility of short circuit between the first electrode lead-out member 13 and the second electrode lead-out member 14 due to the deformation of the single battery 10 itself or the overlapping of foreign matters; the first and second electrode lead- outs 13 and 14 may be located at opposite sides of the battery cell 10, reducing the possibility of the first and second electrode lead- outs 13 and 14 shorting due to foreign matter bridging.

In some embodiments of the present application, the thickness direction of the first electrode lead-out member 13 and the thickness direction of the second electrode lead-out member 14 are both parallel to the thickness direction of the battery cell 10.

The thickness direction of the battery cell 10 extends in the second direction Y, and both the thickness direction of the first electrode lead-out member 13 and the thickness direction of the second electrode lead-out member 14 extend in the second direction Y.

In the above scheme, the thickness direction of the first electrode lead-out member 13 and the thickness direction of the second electrode lead-out member 14 are both parallel to the thickness direction of the single battery 10, so that the increase of the outer dimension of the single battery 10 in the thickness direction caused by the first electrode lead-out member 13 and the second electrode lead-out member 14 can be avoided, and the single battery 10 has a compact structure and higher energy density.

Some embodiments of the present application provide a battery 100 including a battery cell 10.

Since the battery cell 10 has a better safety performance during the assembly process, the battery 100 of the embodiment of the present application also has a better safety performance.

Some embodiments of the present application provide an electric device, which includes a battery 100, and the battery 100 is used for providing electric energy.

Since the battery 100 of the embodiment of the present application has a better safety performance, the electric device of the embodiment of the present application also has a better safety performance.

As shown in fig. 1 to 15, some embodiments of the present application provide a battery cell 10, the battery cell 10 is a pouch battery, and the battery cell 10 includes a packaging bag 11, an electrode assembly 12, a first electrode lead-out member 13, a second electrode lead-out member 14, a first sealing member 15, a second sealing member 16, a first thermal insulation member 17, and a second thermal insulation member (not shown). The package bag 11 includes a first package film 111 and a second package film 112, the first package film 111 and the second package film 112 together forming a receiving cavity to receive the electrode assembly 12 therein, and the first electrode lead-out 13 and the second electrode lead-out 14 protrude out of the package bag 11 to be electrically connected with the outside. Both sides of the first electrode lead-out 13 have a first exposed surface 131 and a first surface 132, respectively, along the thickness direction of the first electrode lead-out 13, and both sides of the second electrode lead-out 14 have a second exposed surface 141 and a second surface 142, respectively, along the thickness direction of the second electrode lead-out 14.

The electrode assembly 12 includes a main body 121, a first tab 122 and a second tab 123, the polarity of the first tab 122 is opposite to that of the second tab 123, the first tab 122 is welded to the first surface 132 of the first electrode lead 13, and the second tab 123 is welded to the second surface 142 of the second electrode lead 14. After the first tab 122 is welded to the first electrode lead-out 13, the first thermal insulation element 17 covers a portion of the first surface 132 of the first electrode lead-out 13 and the first tab 122; after the second tab 123 is welded to the second electrode lead 14, the second thermal shield covers a portion of the second surface 142 of the second electrode lead 14 and the second tab 123. The first heat insulating piece 17 and the second heat insulating piece reduce the heat transfer coefficient between the first electrode lead-out piece 13 and the second electrode lead-out piece 14 and the electrolyte, and prevent the packaging bag 11 from being burnt due to overhigh temperature when the first electrode lead-out piece 13 is welded with an external confluence part and the second electrode lead-out piece 14 is welded with the external confluence part, so that the safety performance of the battery cell 10 when the battery cell is welded with the external confluence part is improved. And the first and second thermal insulators 17 and 142 cover the first and second surfaces 132 and 142 of the first and second electrode leads 13 and 14 to prevent the lateral protrusions and burrs of the first and second electrode leads 13 and 14 from piercing the pouch 11.

The first exposed surface 131 and the second exposed surface 141 are opposite in orientation to reduce the possibility of conductive connection between the first exposed surface 131 and the second exposed surface 141 when the first electrode lead-out member 13 and the second electrode lead-out member 14 are directly or indirectly connected, and further reduce the possibility of short circuit between the first electrode lead-out member 13 and the second electrode lead-out member 14, so that the battery cell 10 can be transferred and the battery cell 10 can be assembled to form the battery 100 with good safety performance.

As shown in fig. 3, 5, 6, 7, 8, 12, and 13, in some embodiments of the present application, the first electrode lead-out member 13 and the second electrode lead-out member 14 are disposed on the same side, a thickness direction of the first electrode lead-out member 13, a thickness direction of the second electrode lead-out member 14, and a thickness direction of the battery cell 10 all extend in the second direction Y, and the first exposed surface 131 and the second exposed surface 141 are oppositely oriented in the second direction Y. The first electrode lead-out 13 and the second electrode lead-out 14 respectively protrude from the accommodating chamber from the opening between the first body 1112 of the first packaging film 111 and the second body 1122 of the second packaging film 112, the first extension 1113 covers the first surface 132, and the second extension 1123 covers the second surface 142. Sealing gaps between three sides of the first surface 132 and the first extension 1113 and between the first side 133 and the first wrapping film 111 with the first sealing member 15 to circumferentially seal the first electrode lead-out member 13 and the wrapping bag 11; the second sealing member 16 seals the second electrode lead-out 14 with the envelope 11 in the same manner as the first sealing member 15 seals the first electrode lead-out 13 with the envelope 11.

As shown in fig. 9, 10, 11, 12 and 14, in other embodiments of the present application, the first packaging film 111 has a first opening 1111, the second packaging film 112 has a second opening 1121, the first exposed surface 131 of the first electrode lead-out member 13 exposes the first opening 1111, and the second exposed surface 141 of the second electrode lead-out member 14 exposes the second opening 1121. The first sealing member 15 fills a gap between the edge of the first exposed surface 131 and the inner surface at the first opening 1111, and the second sealing member 16 fills a gap between the edge of the second exposed surface 141 and the inner surface at the second opening 1121.

It may occur that the battery cells 10 fall down during mass production and line transportation of the battery cells 10, causing the battery cells 10 to be deformed, or conductive foreign matter falls onto the battery cells 10 while being in contact with the first and second electrode lead-out members 13 and 14. Because the first exposed surface 131 and the second exposed surface 141 are opposite in orientation, the possibility that the first electrode lead-out piece 13 and the second electrode lead-out piece 14 are in direct or indirect contact to cause short circuit between the two is reduced, so that the battery cell 10 cannot cause short circuit in the production, transportation and falling processes, and the safety performance of the battery cell 10 in the assembling process is ensured under the condition that no additional process or material is introduced.

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

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

1. A battery cell, comprising:

a first electrode lead-out piece, only one of two surfaces in a thickness direction of which includes a first exposed surface;

a second electrode lead-out member having a polarity opposite to that of the first electrode lead-out member, only one of two surfaces of the second electrode lead-out member in a thickness direction thereof including a second exposed surface;

wherein the first exposed face is oriented opposite the second exposed face.

2. The battery cell of claim 1, further comprising:

packaging bags;

an electrode assembly housed in the packaging bag;

wherein the first electrode lead-out member and the second electrode lead-out member are electrically connected to the electrode assembly, and a surface of the first electrode lead-out member facing away from the first exposed surface in a thickness direction thereof is covered with the packaging bag; a surface of the second electrode lead-out member facing away from the second exposed surface in a thickness direction is covered with the packaging bag.

3. The battery cell as recited in claim 2, wherein the packaging bag includes a first packaging film and a second packaging film, the electrode assembly is disposed between the first packaging film and the second packaging film, the first packaging film is formed with a first opening from which the first exposed face is exposed, the second packaging film is formed with a second opening from which the second exposed face is exposed.

4. The battery cell according to claim 2, wherein the packaging bag includes a first packaging film and a second packaging film, the first packaging film includes a first body and a first extension portion extending from an edge of the first body, the second packaging film includes a second body and a second extension portion extending from an edge of the second body, the electrode assembly is disposed between the first body and the second body, a surface of the first electrode lead-out member facing away from the first exposed surface in a thickness direction is covered by the first extension portion, and a surface of the second electrode lead-out member facing away from the second exposed surface in the thickness direction is covered by the second extension portion.

5. The battery cell of claim 2, further comprising:

a first sealing member sealing a gap between an edge of the first electrode lead-out member and the package bag;

and a second sealing member sealing a gap between an edge of the second electrode lead-out member and the packaging bag.

6. The battery cell as recited in claim 5, wherein the first sealing member and the second sealing member are both sealant, the first electrode lead-out member is connected to the packaging bag through the first sealing member, and the second electrode lead-out member is connected to the packaging bag through the second sealing member.

7. The battery cell as recited in claim 6 wherein the first seal member is disposed one turn along an edge of the first electrode lead and the second seal member is disposed one turn along an edge of the second electrode lead.

8. The battery cell of claim 2, further comprising:

a first heat insulating member covering a side of the first electrode lead-out member facing away from the first exposed surface in a thickness direction;

and a second heat insulating member covering a side of the second electrode lead-out member facing away from the second exposed surface in a thickness direction.

9. The battery cell of claim 2, wherein the electrode assembly includes a main body, a first tab and a second tab, the first tab and the second tab each extending from the main body, a side of the first electrode lead away from the first exposed surface being welded to the first tab, and a side of the second electrode lead away from the second exposed surface being welded to the second tab.

10. The battery cell according to claim 9, wherein a projection of the main body is spaced apart from a projection of the first electrode lead-out member by 1mm or less, and a projection of the main body is spaced apart from a projection of the second electrode lead-out member by 1mm or less, in a thickness direction of the battery cell.

11. The battery cell according to claim 1, wherein the first electrode lead-out member and the second electrode lead-out member are located on the same side or opposite sides of the battery cell.

12. The battery cell according to claim 1, wherein a thickness direction of the first electrode lead-out member and a thickness direction of the second electrode lead-out member are both parallel to a thickness direction of the battery cell.

13. A battery comprising a cell according to any one of claims 1 to 12.

14. An electrical device comprising a battery as claimed in claim 13 for providing electrical energy.

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