阅读说明：本技术 电芯及其电池 (Battery core and battery thereof ) 是由 郭培培 何平 彭业军 林剑威 谢斌 于 2018-07-05 设计创作，主要内容包括：本申请公开了一种电芯及其电池,所述电芯包括：电极组件,所述电极组件包括：第一极片,设有第一涂覆层和未涂覆的第一空箔区；和包装袋,所述包装袋包括：第一主体,所述电极组件设置在所述包装袋内；其中,所述第一空箔区与所述第一主体电连接。此外,所述电极组件还可包括：第二极片,设有第二涂覆层和未涂覆的第二空箔区,所述包装袋还可包括：第二主体,所述第二空箔区与所述第二主体电连接。由此,可以通过在包装袋设置的第一主体或第二主体处对电极组件充电或放电,节省极耳的设置,进而可以节省电芯占用的空间,以提高电芯的能量密度,且可以提高电芯的安全性能和便于电芯的布置。(The application discloses electric core and battery thereof, electric core includes: an electrode assembly, the electrode assembly comprising: the first pole piece is provided with a first coating layer and an uncoated first empty foil area; and a packaging bag, the packaging bag comprising: a first body, the electrode assembly being disposed within the package; wherein the first empty foil region is electrically connected with the first body. In addition, the electrode assembly may further include: the second pole piece is equipped with second coating layer and uncoated second empty foil district, the wrapping bag still can include: a second body, the second empty foil region being electrically connected with the second body. From this, can be through the first main part or the second main part department that set up at the wrapping bag to electrode subassembly charge or discharge, save the setting of utmost point ear, and then can save the space that electric core took to improve the energy density of electric core, and can improve the security performance of electric core and be convenient for arranging of electric core.)

1. A cell, comprising:

an electrode assembly, comprising:

the first pole piece is provided with a first coating layer and an uncoated first empty foil area; and

a packaging bag comprising:

a first body, the electrode assembly being disposed within the package;

wherein the first empty foil region is electrically connected with the first body.

2. The cell of claim 1, wherein the first body comprises:

a first conductive region comprising:

a first metal layer; and

a first fused layer disposed on one surface of the first metal layer.

3. The cell of claim 2, wherein the first empty foil region is electrically connected to the first metal layer.

4. The electrical core of claim 3, wherein the first fused layer is provided with a first recess provided with a first conductive adhesive, and the first empty foil region is electrically connected to the first metal layer through the first conductive adhesive.

5. The electrical core of claim 4, wherein an adhesion between the first conductive adhesive and the first metal layer is less than an adhesion between the first conductive adhesive and the first void foil region.

6. The cell of claim 2, wherein the first body further comprises a first protective layer disposed on another surface of the first metal layer.

7. The electrical core of claim 6, wherein the first protective layer is provided with a third recess, the third recess being provided with a first conductive element, the first conductive element being electrically connected to the first metal layer.

8. The cell of claim 1, wherein the electrode assembly further comprises a second pole piece provided with a second coating layer and an uncoated second empty foil region; and

the packaging bag further comprises a second main body, the first main body is connected with the second main body or arranged at intervals, and the second empty foil area is electrically connected with the second main body.

9. The cell of claim 8, wherein the second body comprises:

a second conductive region comprising:

a second metal layer; and

and a second fused layer disposed on one surface of the second metal layer.

10. The cell of claim 9, wherein the second empty foil region is electrically connected to the second metal layer.

11. The electrical core of claim 10, wherein the second fused layer is provided with a second recess provided with a second conductive adhesive, and the second empty foil region is electrically connected to the second metal layer through the second conductive adhesive.

12. The electrical core of claim 11, wherein an adhesion between the second conductive adhesive and the second metal layer is less than an adhesion between the second conductive adhesive and the second void foil region.

13. The cell of claim 9, wherein the second body further comprises a second protective layer disposed on another surface of the second metal layer.

14. The battery cell of claim 13, wherein the second protective layer is provided with a fourth recess provided with a second conductive element, the second conductive element being electrically connected to the second metal layer.

15. The cell of claim 1, wherein the electrode assembly further comprises a second pole piece provided with a second coating layer and an uncoated second empty foil region; and

the packaging bag further comprises a second main body, the first main body and the second main body are combined to form a containing space, the electrode assembly is contained in the containing space, and the second empty foil area is electrically connected with the second main body.

16. The cell of claim 15, wherein,

the first body includes:

a first metal layer; and

a first fusion layer disposed on one surface of the first metal layer;

the second body includes:

a second metal layer; and

a second alloy layer disposed on one surface of the second metal layer;

wherein the first and second fused layers are oppositely disposed toward each other.

17. The electrical core of claim 16, wherein the first empty foil region is electrically connected to the first metal layer and the second empty foil region is electrically connected to the second metal layer.

18. The electrical core of claim 17, wherein the first fused layer is provided with a first recess provided with a first conductive adhesive, and the first void foil region is electrically connected to the first metal layer through the first conductive adhesive.

19. The electrical core of claim 18, wherein an adhesion between the first conductive adhesive and the first metal layer is less than an adhesion between the first conductive adhesive and the first void foil region and less than an adhesion between the first fluxing layer and the second fluxing layer.

20. The electrical core of claim 17, wherein the second fused layer is provided with a second recess provided with a second conductive adhesive, and the second empty foil region is electrically connected to the second metal layer through the second conductive adhesive.

21. The electrical core of claim 20, wherein an adhesion between the second conductive adhesive and the second metal layer is less than an adhesion between the second conductive adhesive and the second void foil region and less than an adhesion between the first fluxing layer and the second fluxing layer.

22. The cell of claim 16, wherein the first body further comprises a first protective layer disposed on another surface of the first metal layer.

23. The electrical core of claim 22, wherein the first protective layer is provided with a third recess, the third recess being provided with a first conductive element, the first conductive element being electrically connected to the first metal layer.

24. The cell of claim 16, wherein the second body further comprises a second protective layer disposed on another surface of the second metal layer.

25. The electrical core of claim 24, wherein the second protective layer is provided with a fourth recess provided with a second conductive element, the second conductive element being electrically connected to the second metal layer.

26. The electrical core of claim 16, wherein the first body and the second body in combination further form a seal, the seal being connected to the accommodation space, an edge portion of the seal being provided with an insulating layer.

27. The electrical core of claim 16, wherein the electrode assembly is stacked with a plurality of the first pole pieces, a plurality of separator films, and a plurality of the second pole pieces;

the first empty foil areas of the plurality of first pole pieces are electrically connected with each other to form a third conductive unit, and the third conductive unit is electrically connected with the first metal layer;

the second empty foil areas of the plurality of second pole pieces are electrically connected with each other to form a fourth conductive unit, and the fourth conductive unit is electrically connected with the second metal layer.

28. A battery comprising a housing and the cell of any of claims 1-27 disposed within the housing.

Technical Field

The application relates to the field of battery structures, in particular to a battery.

Background

As electronic products tend to be miniaturized and intelligentized, higher requirements are placed on energy density and safety performance of secondary batteries, which requires more energy in smaller volume and reliable safety performance.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art. For this reason, this application has proposed a kind of electric core, it is very convenient that electric core charges and discharges, has less volume and higher energy density, and its security is high.

The battery cell comprises an electrode assembly, wherein the electrode assembly comprises: a first pole piece provided with a first coating layer and an uncoated first empty foil region; and a packaging bag, the packaging bag comprising: a first body, the electrode assembly being disposed within the package; wherein the first empty foil region is electrically connected with the first body.

According to the battery cell provided by the embodiment of the invention, the first empty foil area of the electrode assembly is electrically connected with the first main body, so that the electrode assembly can be charged or discharged through the first main body arranged on the packaging bag conveniently, and a positive electrode lug and/or a negative electrode lug does not need to be arranged outside the battery cell, so that the space occupied by the battery cell can be saved, the energy density of the battery cell can be further improved, and the arrangement of the battery cell in each application device is facilitated.

According to some embodiments of the invention, the first body comprises: a first conductive zone comprising: the metal layer includes a first metal layer and a first merged layer disposed on one surface of the first metal layer.

According to some embodiments of the invention, the first empty foil region is electrically connected to the first metal layer.

According to some embodiments of the invention, the first fusing layer is provided with a first recess provided with a first conductive adhesive, and the first empty foil region is electrically connected with the first metal layer through the first conductive adhesive.

According to some embodiments of the invention, an adhesion between the first conductive adhesive and the first metal layer is less than an adhesion between the first conductive adhesive and the first empty foil region. Through the adhesive force difference between the first conductive adhesive and the first metal layer and the first empty foil area, when gas is generated in the packaging bag of the battery cell and the battery cell expands, the first metal layer and the first empty foil area can be separated through the expansion force so as to cut off the charging and discharging of the battery cell, and then the risk that the battery cell is exploded and ignited due to the continuous use of the battery cell can be avoided, so that the safety of the battery cell can be improved.

According to some embodiments of the invention, the first body further comprises a first protective layer disposed on the other surface of the first metal layer.

According to some embodiments of the invention, the first protection layer is provided with a third recess, the third recess being provided with a first conductive unit, the first conductive unit being electrically connected with the first metal layer.

Furthermore, in accordance with still further embodiments of the present invention, the electrode assembly further includes a second pole piece provided with a second coating layer and an uncoated second empty foil region; the packaging bag further comprises a second main body, the first main body is connected with the second main body or arranged at intervals, and the second empty foil area is electrically connected with the second main body.

According to the battery cell provided by the embodiment of the invention, the second empty foil area of the electrode assembly is electrically connected with the second main body, so that the electrode assembly can be charged and discharged through the second main body arranged on the packaging bag conveniently, and a positive electrode lug and/or a negative electrode lug does not need to be arranged outside the battery cell, so that the space occupied by the battery cell can be saved, the energy density of the battery cell can be further improved, and the arrangement of the battery cell in each application device is facilitated.

According to some embodiments of the invention, the second body comprises a second conductive region comprising: a second metal layer and a second merged layer disposed on one surface of the second metal layer.

According to some embodiments of the invention, the second dummy foil region is electrically connected to the second metal layer.

According to some embodiments of the invention, the second blending layer is provided with a second recess provided with a second conductive adhesive, and the second empty foil region is electrically connected with the second metal layer through the second conductive adhesive.

According to some embodiments of the invention, the adhesion between the second conductive adhesive and the second metal layer is less than the adhesion between the second conductive adhesive and the second empty foil region. Through the adhesive force difference between the second conductive adhesive and the second metal layer and the second empty foil area, the electric core can be similarly generated in the packaging bag of the electric core and expanded, the electric core can be cut off by separating the second metal layer from the second empty foil area through the expansion force so as to charge and discharge, and further the risk of explosion and fire possibly caused by continuous use of the electric core can be avoided, so that the safety of the electric core can be improved.

According to some embodiments of the invention, the second body further comprises a second protective layer disposed on the other surface of the second metal layer.

According to some embodiments of the invention, the second protective layer is provided with a fourth recess, the fourth recess being provided with a second conductive element, the second conductive element being electrically connected with the second metal layer.

Furthermore, in accordance with still further embodiments of the present invention, the electrode assembly further comprises a second pole piece provided with a second coating layer and an uncoated second empty foil area; the packaging bag further comprises a second main body, the first main body and the second main body are combined to form a containing space, the electrode assembly is contained in the containing space, and the second empty foil area is electrically connected with the second main body.

According to some embodiments of the invention, the first body comprises a first metal layer and a first fused layer, the first fused layer being disposed on one surface of the first metal layer; the second body includes a second metal layer and a second fused layer disposed on one surface of the second metal layer; wherein the first and second fused layers are oppositely disposed toward each other.

According to some embodiments of the invention, the first dummy foil region is electrically connected to the first metal layer and the second dummy foil region is electrically connected to the second metal layer.

According to some embodiments of the invention, the first fusing layer is provided with a first recess provided with a first conductive adhesive, and the first empty foil region is electrically connected with the first metal layer through the first conductive adhesive.

According to some embodiments of the invention, the adhesion between the first conductive adhesive and the first metal layer is less than the adhesion between the first conductive adhesive and the first empty foil region and less than the adhesion between the first fluxing layer and the second fluxing layer.

According to some embodiments of the invention, the second blending layer is provided with a second recess provided with a second conductive adhesive, and the second empty foil region is electrically connected with the second metal layer through the second conductive adhesive.

According to some embodiments of the invention, the adhesion between the second conductive adhesive and the second metal layer is less than the adhesion between the second conductive adhesive and the second empty foil region and less than the adhesion between the first blending layer and the second blending layer.

According to some embodiments of the invention, the first body further comprises a first protective layer disposed on the other surface of the first metal layer.

According to some embodiments of the invention, the first protection layer is provided with a third recess, the third recess being provided with a first conductive unit, the first conductive unit being electrically connected with the first metal layer.

According to some embodiments of the invention, the second body further comprises a second protective layer disposed on the other surface of the second metal layer.

According to some embodiments of the invention, the second protective layer is provided with a fourth recess, the fourth recess being provided with a second conductive element, the second conductive element being electrically connected with the second metal layer.

According to some embodiments of the invention, the first body and the second body are joined to form a seal portion, the seal portion being connected to the accommodating space, an edge portion of the seal portion being provided with an insulating layer.

According to some embodiments of the present invention, the electrode assembly is formed by stacking a plurality of the first pole pieces, a plurality of separation films, and a plurality of the second pole pieces; the first empty foil areas of the plurality of first pole pieces are electrically connected with each other to form a third conductive unit, and the third conductive unit is electrically connected with the first metal layer; the second empty foil areas of the plurality of second pole pieces are electrically connected with each other to form a fourth conductive unit, and the fourth conductive unit is electrically connected with the second metal layer.

In addition, the invention further provides a battery, and the battery comprises the battery core.

According to the battery provided by the embodiment of the invention, the battery comprises a shell and the battery cell, and the battery cell is arranged in the shell.

The battery provided by the embodiment of the invention can realize charging and discharging through the electrode component of the battery cell, and the structure can save the occupied space of the battery without arranging a lug outside the battery cell, improve the space utilization rate of the battery and further improve the energy density of the battery. Meanwhile, when the battery generates abnormal gas and expands in the use process, the packaging bag of the battery core can separate the empty foil area of the electrode assembly from the packaging bag through the expansion of the gas, so that the charging and discharging paths of the battery are cut off, the risk of explosion and ignition caused by the continuous use of the battery can be prevented, and the use safety of the battery can be improved.

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

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a cell according to an embodiment of the invention;

FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along the line B-B in FIG. 1;

fig. 4 is a schematic diagram of a cell according to another embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view taken along the direction C-C in FIG. 4;

FIG. 6 is a schematic cross-sectional view taken along the direction D-D in FIG. 4;

fig. 7 is a schematic diagram of a cell according to another embodiment of the invention;

FIG. 8 is a schematic cross-sectional view taken along direction E-E of FIG. 7;

FIG. 9 is an enlarged partial view of the circle at M in FIG. 8;

FIG. 10 is an enlarged partial view of the circle at N in FIG. 8;

FIG. 11 is a schematic cross-sectional view taken along the direction F-F in FIG. 7;

fig. 12 is a schematic diagram of a cell according to another embodiment of the invention;

fig. 13 is a schematic sectional view taken along the direction G-G in fig. 12, in which an electrode assembly is arranged in a lamination stack;

FIG. 14 is a schematic sectional view taken along the direction G '-G' in FIG. 12, in which the electrode assembly is disposed in a wound structure;

FIG. 15 is a schematic sectional view taken along the direction H-H in FIG. 12;

fig. 16 is a schematic diagram of a cell according to another embodiment of the invention;

FIG. 17 is a schematic sectional view taken along the line I-I in FIG. 16;

fig. 18 is a schematic sectional view taken along the direction J-J in fig. 16.

Reference numerals:

an electric core 100;

an electrode assembly 10;

the first electrode sheet 110, the first coating layer 111, the first empty foil area 112, and the first current collector 113;

a second pole piece 120, a second coating layer 121, a second empty foil area 122, and a second current collector 123;

a separator 130;

a packaging bag 20;

a first main body 210, a first conductive region 211, a first metal layer 211a, a first fusion layer 211b, a first conductive adhesive 211c, a first recess 211d, a first protection layer 212, a first conductive unit 212a, and a third recess 212 b;

a second main body 220, a second conductive region 221, a second metal layer 221a, a second fusion layer 221b, a second conductive adhesive 221c, a second recess 221d, a second protective layer 222, a second conductive unit 222a, and a fourth recess 222 b;

a sealing part 230, an insulating layer 240, a third conductive unit 250, and a fourth conductive unit 260.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for ease of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

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

In general, a lithium ion secondary battery includes a positive electrode tab composed of a lithium-based oxide as a cathode active material and a negative electrode tab composed of a carbon material as a negative active material. The positive and negative electrode plates are separated from each other by a separator (e.g., a microporous polymer separator membrane, etc.) that allows lithium ions to shuttle between the two electrodes. Batteries are further classified into liquid electrolyte batteries and polymer electrolyte batteries according to the electrolyte used for lithium ion secondary batteries. For example, a secondary battery using a liquid electrolyte is called a "lithium ion secondary battery", and a secondary battery using a polymer electrolyte is called a "lithium polymer secondary battery". The lithium ion secondary battery may be formed in various shapes, such as a cylindrical type lithium ion secondary battery, a pouch type lithium ion secondary battery, and the like.

Due to being positivePolar materials (e.g., LiCoO)₂，LiFePO₄Etc.) and anode materials (e.g., natural graphite, artificial graphite, etc.) are stable in the atmosphere and are easily handled in industrial practice, and thus the battery cell is generally assembled in a discharged state. During charging, the two electrodes are externally connected to a power source, causing electrons to be released from the positive electrode to the negative electrode. Meanwhile, lithium ions move from the positive electrode to the inside through the electrolyte. As such, external energy is electrochemically stored in the form of chemical energy in negative and positive electrode materials having different chemical potentials (i.e., positive high and negative low potentials). During discharge, electrons move from the negative electrode to the outside through an external load (e.g., a circuit within a mobile phone or an engine in an electric vehicle) to perform work, and lithium ions move from the negative electrode to the positive electrode inside the electrolyte. As a result, the electrochemical reaction at the two electrodes releases the stored chemical energy. This is also known as the "rocking chair" mechanism, and lithium ions shuttle back and forth between the negative and positive electrodes during charge and discharge cycles.

Among them, the pouch type lithium ion secondary battery includes a pouch type case including a top case and a bottom case, and an electrode assembly received in the case. The top and bottom casings are joined to one another on one side and the other side is open to receive an electrode assembly. An accommodation space of the electrode assembly is formed in the lower case. Top and bottom sealing portions are formed by, for example, thermally bonding the top and bottom peripheries of the housing.

Further, the outer case is a multi-layered structure, and includes a thermal adhesive layer having thermal adhesive property for sealing, a metal layer formed of a metal material for maintaining mechanical strength and for blocking moisture, and an insulating layer.

The electrode assembly may include a positive electrode tab to which the positive electrode tab is electrically connected, a negative electrode tab to which the negative electrode tab is electrically connected, and a separator disposed between the positive electrode tab and the negative electrode tab. The electrode assembly may be wound from a positive electrode sheet, a separator, and a negative electrode sheet.

The positive plate comprises a positive current collector and a positive active material layer coated on the surface of the positive current collector and containing lithium-based oxide, and the positive current collector can adopt aluminum foil. The positive electrode lug can be fixed on the positive electrode current collector through welding or can be formed by directly cutting the positive electrode current collector. The material of the positive electrode tab may be aluminum.

The negative plate comprises a negative current collector and a negative active material arranged on the negative current collector, the negative current collector can adopt a copper foil, and the negative active material comprises a carbon material. The negative electrode tab can be fixed on the negative electrode current collector by welding or can be formed by directly cutting the negative electrode current collector, and the material of the negative electrode tab can be nickel or nickel alloy and the like.

The isolating film is arranged between the positive plate and the negative plate to play an insulating role. The release film may be formed of polyethylene, polypropylene, or a combination of polyethylene and polypropylene. And the width of the isolating film is larger than the width of the positive plate and the negative plate, so that the short circuit between the positive plate and the negative plate can be effectively prevented.

A battery cell according to an embodiment of the present application is described in detail below with reference to fig. 1 to 18.

As shown in fig. 1 to 6, a battery cell 100 according to an embodiment of the present invention includes an electrode assembly 10 and a packaging bag 20, where the electrode assembly 10 includes a first pole piece 110, and the first pole piece 110 is provided with a first coating layer 111 and an uncoated first empty foil region 112. It should be added that the first pole piece 110 may include a first current collector 113, and the first current collector 113 is provided with a first coating layer coated with a first active material and an uncoated first empty foil area 112. The package pouch 20 includes a first body 210, and the electrode assembly 10 is disposed within the package pouch 20, wherein the first empty foil section 112 is electrically connected to the first body 210.

According to one embodiment of the cell of the present invention, the electrode assembly 10 further comprises a second pole piece 120, the second pole piece 120 being provided with a second coating layer 121 and an uncoated second empty foil area 122. It should be added that the second electrode sheet 120 may include a second current collector 123, and the second current collector 123 is provided with a second coating layer 121 coated with a second active material and an uncoated second empty foil region 122. The package 20 further comprises a second body 220, wherein the second empty foil area 122 is electrically connected to the second body 220.

Through the electrical connection between the first empty foil area 112 and the first main body 210 and the electrical connection between the second empty foil area 122 and the second main body 220, the first pole piece 110 and the second pole piece 120 of the electrode assembly 10 are electrically connected with the packaging bag 20, so that the electrode assembly 10 can be charged and discharged through the first main body 210 and the second main body 220 of the packaging bag 20, which is very convenient, and the arrangement can make the battery cell 100 not need to arrange a positive pole tab and a negative pole tab outside the battery cell, thereby effectively saving the occupied space of the battery cell 100, improving the space utilization rate of the battery cell 100 to further improve the energy density of the battery cell 100, and facilitating the arrangement of the battery cell 100 in each application device. It should be noted that, only the first main body 210 or the second main body 220 may be disposed on the packaging bag 20 as a positive electrode tab or a negative electrode tab inside the battery cell, and a negative electrode tab or a positive electrode tab may be disposed outside the battery cell, which is not limited to this.

As shown in fig. 2, according to an embodiment of the battery cell of the present invention, the first body 210 and the second body 220 may be embedded, coupled, or adhered in the packaging bag 20, and the first body 210 and the second body 220 may be connected or coupled together at intervals. The remaining portion of the package 20 except for the first body 210 and the second body 220 may be a package commonly used in the art, and for example, the remaining portion of the package may include an insulating layer, a metal layer, and a fusing layer in this order from the outside to the inside.

According to an embodiment of the battery cell of the present invention, the first body 210 and the second body 220 may be disposed on different surfaces of the packaging bag 20, such as an upper surface of the packaging bag 20 and a lower surface of the packaging bag 20, which may be specifically described in conjunction with fig. 1, fig. 2 or fig. 3. The first body 210 and the second body 220 may be disposed together on the same surface of the package 20, as simultaneously disposed on the upper surface of the package 20 or the lower surface thereof, which may be specifically illustrated in fig. 4, 5 or 6.

According to an embodiment of the battery cell of the present invention, the first main body 210 and the first empty foil area 112 are electrically connected through a first conductive adhesive 211c, and the adhesion force between the first conductive adhesive 211c and the first main body 210 is smaller than the adhesion force between the first conductive adhesive 211c and the first empty foil area 112. The second main body 220 and the second empty foil region 122 can also be electrically connected through a second conductive adhesive 221c, and the adhesion force between the second conductive adhesive 221c and the second main body 120 is smaller than the adhesion force between the first conductive adhesive 211c and the second empty foil region 122. Through the difference of the adhesive force between the first main body 210 and the first empty foil area 112 and the first conductive adhesive 211c, and between the second main body 220 and the second empty foil area 122 and the second conductive adhesive 221c, when gas is generated in the packaging bag 20 of the battery cell and expands, the first main body 210 and the first empty foil area 112, and the second main body 220 and the second empty foil area 122 can be separated by the expansion force to cut off the charging and discharging of the battery cell, so that the risk that explosion and fire may occur due to the continuous use of the battery cell can be avoided, and the safety of the battery cell can be improved.

According to an embodiment of the battery cell of the present invention, the first main body 210 may include a fused layer and a metal layer, the fused layer includes a first fused layer, the metal layer includes a first metal layer, the fused layer may be integrally disposed or formed with the fused layer of the remaining portion of the packaging bag 20, and then a recess portion is disposed on the fused layer of the first main body 210, the recess portion includes a first recess portion 211d, the first conductive adhesive 211c is disposed in the recess portion, and the first hollow foil region 112 is electrically connected with the metal layer of the first main body 210 through the first conductive adhesive 211 c. Similarly, the second body 220 may also have a similar structure to the first body 210, i.e., the second body 220 may also include a fused layer including the second fused layer 221b and a metal layer including the second metal layer, and the fused layer of the second body 220 may also include a recess including the second recess 221 d.

In addition, according to an embodiment of the cell of the present invention, the first body 210 may include a conductive region and a non-conductive region, and the first dummy foil region 112 is electrically connected to the conductive region of the first body 210 by the first conductive adhesive 211 c. The second body 220 may also include conductive and non-conductive regions, and the second dummy foil region 122 is electrically connected to the conductive region of the second body 220 by a second conductive adhesive 221 c.

In one embodiment of the battery cell of the present invention, the electrode assembly 10 may be formed by stacking a plurality of first pole pieces 110, a plurality of separators 130, and a plurality of second pole pieces 120. The first empty foil areas 112 of the plurality of first pole pieces 110 are electrically connected to each other to form a third conductive unit 250, and the third conductive unit 250 is electrically connected to the first body 210 or the metal layer of the first body 210. The second empty foil regions 122 of the plurality of second pole pieces 120 are electrically connected to each other to form a fourth conductive unit 260, and the fourth conductive unit 260 is electrically connected to the second body 220 or the metal layer of the second body 220. It should be noted that, when the electrode assembly 10 adopts the above-mentioned stacking or lamination structure, a layer of blank first current collector 113 or blank second current collector 123 may be further disposed on the upper surface of the stacking or lamination structure, and a layer of blank second current collector 123 or blank first current collector 113 may be correspondingly further disposed on the lower surface of the stacking or lamination structure, and then the third conductive units 250 formed by the other first blank foil regions 112 are electrically connected to the first current collector 113, and the fourth conductive units 260 formed by the other second blank foil regions 122 are electrically connected to the second current collector 123, as shown in fig. 2 and 3, which may also be adopted in some other embodiments of the battery cell of the present invention. In addition, the electrode assembly 10 may be formed by sequentially winding a plurality of first pole pieces 110, a plurality of separators 130, and a plurality of second pole pieces 120, and electrically connecting the first empty foil region 112 of the first pole piece 110 with the first body 210 and the second empty foil region 122 of the second pole piece 120 with the second body 220.

In addition, another embodiment of the battery cell of the present invention is also provided, as shown in fig. 7 to 15, the battery cell 100 includes an electrode assembly 10 and a packaging bag 20, the electrode assembly 10 includes a first pole piece 110 and a second pole piece 120, the first pole piece 110 is provided with a first coating layer 111 and an uncoated first empty foil area 112, and the second pole piece 120 is provided with a second coating layer 121 and an uncoated second empty foil area 122. It should be added that, the first pole piece 110 may include a first current collector 113, and a first coating layer coated with a first active material and an uncoated first empty foil area 112 are provided on the first current collector 113; the second electrode sheet 120 may include a second current collector 123, and the second current collector 123 is provided with a second coating layer 121 coated with a second active material and an uncoated second empty foil region 122. The pouch 20 includes a first body 210 and a second body 220, the first body 210 and the second body 220 being combined to form a receiving space in which the electrode assembly 10 is received, wherein the first empty foil section 112 is electrically connected to the first body 210, and the second empty foil section 122 is electrically connected to the second body 220.

As described above, the electrode assembly 10 can be charged and discharged conveniently through the first main body 210 and the second main body 220 of the packaging bag 20, and such arrangement makes it unnecessary for the battery cell 100 to have a positive electrode tab and a negative electrode tab outside thereof, so that the occupied space of the battery cell 100 can be effectively saved, the space utilization of the battery cell 100 can be improved to further improve the energy density thereof, and the arrangement of the battery cell 100 in each application device can be facilitated.

In another embodiment of the battery cell of the present invention, as shown in fig. 8, 9 and 10, the first body 210 includes a first metal layer 211a and a first fusion layer 211b, and the first fusion layer 211b is disposed on one surface of the first metal layer 211 a. The second body 220 includes a second metal layer 221a and a second fusion layer 221b, the second fusion layer 221b is disposed on one surface of the second metal layer 221a, and the first and second fusion layers 211b and 221b are disposed opposite to each other toward each other.

Specifically, the first metal layer 211a and the second metal layer 221a have good electrical conductivity, the first fusion layer 211b and the second fusion layer 221b are not electrically conductive, and by disposing the first fusion layer 211b and the second fusion layer 221b toward each other, a housing space housing the electrode assembly 10 can be configured and sealed, and also the first metal layer 211a and the second metal layer 221a can be prevented from being electrically conductive with each other, and further the influence of moisture, gas, and the like outside the cell on the electrolyte can be blocked. The first metal layer 211a and the second metal layer 221a may be made of stainless steel or aluminum material with good conductivity, and the first fused layer 211b and the second fused layer 221b may be made of polypropylene material.

In another embodiment of the battery cell of the present invention, the first empty foil region 112 is electrically connected to the first metal layer 211a, and the second empty foil region 122 is electrically connected to the second metal layer 221 a. Such a connection may electrically connect the electrode assembly 10 with the pouch 20, thereby eliminating the need for a positive electrode tab and a negative electrode tab on the outside of the cell.

In another embodiment of the battery cell of the present invention, as shown in fig. 9, the first fused layer 211b is provided with a first recess 211d, the first recess 211d is provided with a first conductive adhesive 211c, and the first empty foil region 112 is electrically connected to the first metal layer 211a through the first conductive adhesive 211 c. Specifically, the first concave portion 211d is configured to have a good positioning effect on the position of the first conductive adhesive 211c, so that the first conductive adhesive 211c is conveniently configured, and the thickness of the battery cell 100 is not increased by such configuration, thereby reducing the energy density of the battery cell 100.

In another embodiment of the battery cell of the present invention, the adhesion between the first conductive adhesive 211c and the first metal layer 211a is smaller than the adhesion between the first conductive adhesive 211c and the first empty foil region 112, and smaller than the adhesion between the first fused layer 211b and the second fused layer 221 b.

It can be understood that, when the battery cell 100 generates gas abnormally during use to cause the package bag 20 to expand, due to the difference in adhesion force between the first conductive adhesive 211c, the first metal layer 211a, the first hollow foil region 112, and the first fused layer 211b and the second fused layer 221b, the first metal layer 211a and the first hollow foil region 112 can be disconnected by the expansion force generated by the gas, and the first fused layer 211b and the second fused layer 221b still maintain a sealed connection state, so that charging and discharging of the battery cell 100 can be cut off, further, the risk that explosion and fire may be caused by the continuous use of the battery cell can be avoided, and thus, the safety of the battery cell can be improved.

In another embodiment of the battery cell of the present invention, as shown in fig. 10, the second fusing layer 221b is provided with a second recess 221d, the second recess 221d is provided with a second conductive adhesive 221c, and the second empty foil region 122 is electrically connected to the second metal layer 221a through the second conductive adhesive 221 c. Specifically, the second recessed portion 221d has a good positioning effect on the position of the second conductive adhesive 221c, so that the second conductive adhesive 221c can be conveniently disposed, and the thickness of the battery cell 100 is not increased by such a disposition, so as to reduce the energy density of the battery cell 100.

In another embodiment of the battery cell of the present invention, the adhesion between the second conductive adhesive 221c and the second metal layer 221a is smaller than the adhesion between the second conductive adhesive 221c and the second empty foil region 122, and is smaller than the adhesion between the first fused layer 211b and the second fused layer 221 b.

It can also be understood that, when the battery cell 100 generates gas abnormally during use to cause the package bag 20 to expand, due to the difference in adhesion between the second conductive adhesive 221c, the second metal layer 221a, the second hollow foil region 122, and the first fused layer 211b and the second fused layer 221b, the second metal layer 221a and the second hollow foil region 122 can be disconnected by the expansion force generated by the gas, and the first fused layer 211b and the second fused layer 221b still maintain a sealed connection state, so that charging and discharging of the battery cell 100 can be cut off, further, the risk that explosion and fire may be caused by the continuous use of the battery cell can be avoided, and thus, the safety of the battery cell can be improved.

In another embodiment of the battery cell of the present invention, the first main body 210 further includes a first protective layer 212, and the first protective layer 212 is disposed on the other surface of the first metal layer 211a, as can be seen in fig. 8 and 9. Specifically, the first protection layer 212 may be made of a nylon material, the first protection layer 212 and the first fusing layer 211b are respectively disposed on two surfaces of the first metal layer 211a, and the first protection layer 212 and the first fusing layer 211b are not conductive. The first protective layer 212 is disposed at the outermost side of the battery cell 100, thereby providing good insulation protection to the electrode assembly 10, the first metal layer 211a, and the first fusion layer 211 b. It should be noted that "outer" herein refers to the side of the package 20 opposite to the electrode assembly 10, and "inner" refers to the side opposite to "outer".

In another embodiment of the battery cell of the present invention, the first protection layer 212 is provided with a third recess 212b, the third recess 212b is provided with a first conductive unit 212a, and the first conductive unit 212a is electrically connected to the first metal layer 211a, as shown in fig. 8 and 9. The third recess 212b has a positioning function on the first conductive unit 212a, so as to facilitate the arrangement of the first conductive unit 212a, and the electrode assembly 10 can be charged or discharged at the first conductive unit 212a without increasing the thickness of the battery cell 100, thereby saving the space occupied by the battery cell 100 and improving the space utilization rate of the battery cell 100 in various application devices.

In another embodiment of the battery cell of the present invention, the second main body 220 further includes a second protection layer 222, and the second protection layer 222 is disposed on the other two surfaces of the second metal layer 221a, as shown in fig. 8 and 10. Specifically, the second protection layer 222 may be made of a nylon material, the second protection layer 222 and the second blending layer 221b are respectively disposed on two surfaces of the second metal layer 221a, and the second protection layer 222 and the second blending layer 221b are not conductive. The second protective layer 222 is disposed at the outermost side of the battery cell 100, thereby providing good insulation protection to the electrode assembly 10, the second metal layer 221a, and the second fusing layer 221 b. As described above, here, "outer" refers to the side of the pouch 20 with respect to the electrode assembly 10, and "inner" refers to the side opposite to "outer".

In another embodiment of the battery cell of the present invention, the second protection layer 222 is provided with a fourth recess 222b, the fourth recess 222b is provided with a second conductive unit 222a, and the second conductive unit 222a is electrically connected to the second metal layer 221a, as shown in fig. 8 and fig. 10. The fourth concave portion 222b has a positioning function on the second conductive unit 222a, so as to facilitate the arrangement of the second conductive unit 222a, and the second conductive unit 222a can be used for charging or discharging the electrode assembly 10, so that the thickness of the battery cell 100 is not increased, the space occupied by the battery cell 100 is saved, and the space utilization rate of the battery cell 100 in each application device can be improved.

As shown in fig. 8, 11, 13 to 15, in some embodiments of the battery cell of the present invention, the first main body 210 and the second main body 220 are combined to form a sealing part 230, the sealing part 230 is connected to the accommodating space, and an edge portion of the sealing part 230 is provided with an insulating layer 240. The insulating layer 240 may perform a good insulating protection function on an outer edge of the sealing portion 230 formed by the first main body 210 and the second main body 220 in the battery cell 100, so that there is no risk of mutual conduction between the first metal layer 211a and the second metal layer 221a, and the safety of a user during using the battery cell 100 may be ensured, thereby further improving the safety performance of the battery cell 100.

In some embodiments of the battery cell of the present invention, as shown in fig. 16 to 18, only the first main body 210 or the second main body 220 may be configured as an electrically conductive component, that is, only the first empty foil region 112 is electrically connected to the first main body 210 to serve as a tab (e.g., a positive tab or a negative tab), or only the second empty foil region 122 is electrically connected to the second main body 220 to serve as a tab (e.g., a positive tab or a negative tab), and the other tab (e.g., a negative tab or a positive tab, respectively) of the battery cell 100 is configured outside the battery cell 100. It is understood that the positive electrode connection point of the battery cell 100 may be disposed on only one side of the packaging bag 20, and the negative electrode connection point of the battery cell 100 may be disposed outside the packaging bag 20; or the negative electrode connection point of the battery cell 100 is arranged on one surface of the packaging bag 20, and the positive electrode connection point of the battery cell 100 is arranged outside the packaging bag 20. And as described above, this structure can improve the space utilization rate and the use safety of the battery cell 100.

In addition, in some embodiments of the battery cell of the present invention, the electrode assembly 10 is formed by stacking a plurality of first pole pieces 110, a plurality of separators 130, and a plurality of second pole pieces 120, the first empty foil regions 112 of the plurality of first pole pieces 110 are electrically connected to each other to form a third conductive unit 250, the third conductive unit 250 is electrically connected to the first metal layer 211a, the second empty foil regions 122 of the plurality of second pole pieces 120 are electrically connected to each other to form a fourth conductive unit 260, and the fourth conductive unit 260 is electrically connected to the second metal layer 221a, as shown in fig. 8 and 11. In addition, when the electrode assembly 10 is manufactured in a stacked or laminated structure, the stacked or laminated structure may be adopted, that is, the first current collector 113 and the second current collector 123 are respectively disposed on the upper surface and the lower surface of the stacked or laminated structure, as shown in fig. 8, 11, 13 and 15, and thus, the description thereof is omitted. It is understood that the electrode assembly 10 may also be formed by winding a plurality of first pole pieces 110, a plurality of separators 130, and a plurality of second pole pieces 120, as shown in fig. 14. It should be noted that the first pole piece 110 may be a positive pole piece or a negative pole piece, and the second pole piece 120 may be a negative pole piece or a positive pole piece.

It should be understood that the negative electrode and the positive electrode are shown in the drawings, but in actual production, the negative electrode and the positive electrode can be interchanged, and the labels are provided for the convenience of the reader to understand the scheme.

In addition, the present invention also provides an embodiment of a battery, which includes a casing and the battery cell 100 described above, where the battery cell 100 is disposed in the casing. The battery can realize charging and discharging through the battery core 100, and the structure of the battery core 100 can ensure that the battery does not need to be provided with lugs outside the battery core 100, so that the occupied space of the battery can be saved, the space utilization rate of the battery is improved, and the energy density of the battery can be further improved. Meanwhile, when the battery expands due to abnormal gas generation during use, the packaging bag 20 of the battery cell 100 may separate the empty foil region of the electrode assembly 10 from the packaging bag 20 through the expansion of the gas, thereby cutting off the charging and discharging paths of the battery, preventing the risk of explosion and ignition caused by the continuous use of the battery, and further improving the safety of the battery.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.