CN112838259B - Pole piece assembly, battery core and battery - Google Patents
Pole piece assembly, battery core and battery Download PDFInfo
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- CN112838259B CN112838259B CN202110232746.5A CN202110232746A CN112838259B CN 112838259 B CN112838259 B CN 112838259B CN 202110232746 A CN202110232746 A CN 202110232746A CN 112838259 B CN112838259 B CN 112838259B
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The application relates to the field of batteries, in particular to a pole piece assembly, an electric core and a battery. A pole piece assembly, which comprises a diaphragm and a plurality of sequentially stacked common pole pieces, wherein the first polarity leading-out surfaces of the plurality of common pole pieces and/or the second polarity leading-out surfaces are arranged in a step shape; the first polarity is opposite to the second polarity. After the pole piece assembly is wound or laminated, the negative electrode leading-out surface and/or the positive electrode leading-out surface are arranged in a stepped mode, the negative electrode leading-out surface or the positive electrode leading-out surface is stacked to form a pole lug, then the pole lug is connected with the transfer piece, in the connection process, one transfer piece can be connected with each leading-out surface, the volume and the quality of the transfer piece are reduced, the common pole piece comprises an insulating supporting layer, the quality of the insulating supporting layer is far smaller than that of the metal layer, and the energy density can be improved.
Description
Technical Field
The application relates to the field of batteries, in particular to a pole piece assembly, an electric core and a battery.
Background
The connection mode between the electrode assembly and the top cap sheet of the secondary battery is mainly: the electrode lugs of the electrode assembly and the adapter sheet are welded, and then the adapter sheet is assembled on the top cover sheet in a laser welding mode.
However, the contact area between the tab and the tab is large, so that the tab and the tab occupy a large space inside the secondary battery, resulting in a low energy density of the secondary battery.
Disclosure of Invention
It is an aim of embodiments of the present application to provide a pole piece assembly, a battery cell and a battery, which aim to increase the energy density of the battery.
A first aspect of the present application provides a pole piece assembly comprising:
a diaphragm; and
a plurality of sequentially stacked common pole pieces, wherein two adjacent common pole pieces are separated by the diaphragm;
each common pole piece comprises a first polar active layer, a first polar conductive layer, an insulating support layer, a second polar conductive layer and a second polar active layer which are sequentially stacked; the first polar conductive layer of each common pole piece faces to the same side of the thickness direction of the common pole piece;
each common pole piece is provided with a first polarity tab and a second polarity tab; the first polar lug only comprises a first polar guide surface attached to the insulating support layer; the first polarity conductive layer is electrically connected with the first polarity leading-out surface; the second polar lug only comprises a second polar guide surface attached to the insulating support layer, and the second polar guide surface is electrically connected with the second polar conductive layer;
the first polarity leading-out surfaces and/or the second polarity leading-out surfaces are arranged in a step shape along the thickness direction of the common pole piece, so that after the common pole pieces are overlapped, each first polarity leading-out surface is at least partially exposed to the surface, and each second polarity leading-out surface is at least partially exposed to the surface;
wherein the first polarity is opposite to the second polarity.
After the pole piece assembly is wound or laminated, the negative electrode leading-out surface and/or the positive electrode leading-out surface are arranged in a stepped mode, the negative electrode leading-out surface or the positive electrode leading-out surface is stacked to form a pole lug, then the pole lug is connected with the transfer piece, in the connection process, one transfer piece can be connected with each leading-out surface, the volume and the quality of the transfer piece are reduced, the common pole piece comprises an insulating supporting layer, the quality of the insulating supporting layer is far smaller than that of the metal layer, and the energy density can be improved.
In some embodiments of the first aspect of the present application, the areas of the plurality of first polarity leading-out surfaces gradually increase and the sizes of the plurality of second polarity leading-out surfaces gradually decrease along the thickness direction of the common pole piece.
In some embodiments of the first aspect of the present application, the first polarity-inducing surface extends in a direction opposite to that of the second polarity-inducing surface.
A second aspect of the present application provides a battery cell comprising a first polarity switching tab, a second polarity switching tab, and a pole piece assembly as described above; the plurality of first polarity leading-out surfaces are connected with the first polarity switching sheet; the plurality of second polarity leading-out surfaces are connected to the second polarity switching pieces.
In some embodiments of the second aspect of the present application, after the pole piece assembly is wound, the first polarity switching piece is connected to a portion of each of the first polarity leading-out surfaces that is not in contact with the adjacent insulating support layer, and the first polarity switching piece sandwiches each of the first polarity leading-out surfaces; the second polarity switching sheet end part extends into a position between the two second leading-out surfaces positioned at the middle position, and the second polarity switching sheet is connected with a part of each second polarity leading-out surface which is not contacted with the adjacent insulating supporting layer; the plurality of second leading-out surfaces commonly hold the second polarity switching sheet.
A third aspect of the present application provides a battery cell, the battery cell comprising:
a first polarity switching sheet;
a second polarity switching tab;
a diaphragm; and
a plurality of common pole pieces; adjacent two common pole pieces are separated by the diaphragm;
each common pole piece comprises a first polar active layer, a first polar conductive layer, an insulating support layer, a second polar conductive layer and a second polar active layer which are sequentially stacked; the first polar conductive layers of each common pole piece face to the same side of the thickness direction of the common pole piece;
the end part of each common pole piece is provided with a first polarity leading-out surface electrically connected with the first polarity conductive layer and a second polarity leading-out surface electrically connected with the second polarity conductive layer;
the area of the first polar guide surface positioned in the middle part is gradually increased or reduced along the thickness direction of the common pole piece; or, along the thickness direction of the common pole piece, the area of the first polarity leading-out surface is gradually increased or reduced;
the area of the second polarity leading-out surface positioned in the middle part is gradually increased or decreased along the thickness direction of the common pole piece; or, along the thickness direction of the common pole piece, the area of the second polarity leading-out surface is gradually increased or reduced;
each first polarity leading-out surface is connected with the first polarity switching piece; each second polarity leading-out surface is connected with the second polarity switching sheet;
wherein the first polarity is opposite to the second polarity.
In some embodiments of the third aspect of the present application, a portion of each of the first polarity-guiding surfaces that is not in contact with the adjacent insulating support layer is sandwiched by the first polarity-switching sheets; all the parts of the second polarity leading-out surface which are not contacted with the adjacent insulating support layer commonly clamp one second polarity switching sheet.
In some embodiments of the third aspect of the present application, the first polarity-inducing surface extends in a direction opposite to that of the second polarity-inducing surface.
In some embodiments of the third aspect of the present application, a first polarity transfer tab is snapped or welded to the first polarity exit face.
A battery comprises a shell and the battery cell, wherein the battery cell is accommodated in the shell.
The conductive surfaces of the plurality of common pole pieces are arranged in a certain order, and only one or two switching pieces can be connected with each conductive surface, so that the volume and the weight of the switching pieces can be reduced, and the energy density is improved. In addition, the common electrode plate comprises an insulating supporting layer, and the mass of the insulating supporting layer is far smaller than that of the metal layer, so that the energy density of the battery cell can be further reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic structural view of a pole piece assembly provided by an embodiment of the present application;
FIG. 2 shows a schematic cross-sectional view of a common pole piece provided by an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first state of a battery cell according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of the positive electrode lead-out surface after winding the common electrode sheet according to the embodiment of the present application;
FIG. 5 shows a further schematic view of the anode lead-out face after winding of the common pole piece provided in an embodiment of the present application;
FIG. 6 shows a schematic view of the anode lead-out face after lamination of the common pole piece provided in an embodiment of the present application;
fig. 7 shows a further schematic view of the anode lead-out face after lamination of the common pole piece provided in an embodiment of the present application.
Icon: 100-pole piece assembly; a 101-separator; 102-sharing a pole piece; 103-first direction; 110-an insulating support layer; 111-a positive electrode active layer; 112-an anode conductive layer; 113-a positive electrode lead-out surface; 121-a negative electrode conductive layer; 122-a negative electrode active layer; 123-a negative electrode lead-out surface; 200-cell; 210-positive electrode switching piece; 220-negative electrode tab.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the product of the application is used, or those conventionally understood by those skilled in the art, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Example 1
Fig. 1 shows a schematic structural diagram of a pole piece assembly 100 according to an embodiment of the present application, referring to fig. 1, the embodiment provides a pole piece assembly 100, where the pole piece assembly 100 includes a plurality of diaphragms 101 and a plurality of common pole pieces 102. Adjacent two common pole pieces 102 are each separated by a membrane 101.
Fig. 2 is a schematic cross-sectional view of the common pole piece 102 provided in an embodiment of the present application, please refer to fig. 2.
The common electrode piece 102 comprises a second polar active layer, a second polar conductive layer, an insulating support layer 110, a first polar conductive layer and a first polar active layer which are sequentially stacked; one direction of the thickness of the common pole pieces 102, which is defined now, is a first direction 103, and the first polarity conductive layer of each common pole piece 102 is arranged towards the first direction 103;
in this application, for convenience of description, the first polarity is a positive electrode, and the second polarity is a negative electrode, and it should be noted that, in other embodiments of this application, the first polarity may be a negative electrode, and the second polarity may be a positive electrode.
The common electrode sheet 102 includes a positive electrode active layer 111, a positive electrode conductive layer 112, an insulating support layer 110, a negative electrode conductive layer 121, and a negative electrode active layer 122, which are stacked in this order.
The material of the insulating support layer 110 may be, for example, a polymer material, such as polyamides, polyimides, polyesters, polyolefins, epoxy resins, and the like.
The materials of the positive electrode active layer 111, the positive electrode conductive layer 112, the negative electrode conductive layer 121, and the negative electrode active layer 122 are not limited herein.
Each common pole piece 102 is provided with a positive pole lug and a negative pole lug; the positive electrode tab includes only a positive electrode lead-out surface 113 electrically connected to the positive electrode conductive layer 112, and the positive electrode lead-out surface 113 is bonded to the insulating support layer 110. The negative electrode tab includes only a negative electrode lead-out surface 123 electrically connected to the negative electrode conductive layer 121, and the negative electrode lead-out surface 123 is bonded to the insulating support layer 110.
The end of each common electrode tab 102 is provided with a negative electrode lead-out face 123 electrically connected to the negative electrode conductive layer 121, with the end of each common electrode tab 102.
The plurality of common pole pieces 102 are stacked, and the direction of each common pole piece 102 faces the first direction 103; the plurality of positive electrode lead-out surfaces 113 are arranged in a stepwise manner along the first direction 103.
In the present embodiment, the plurality of anode lead-out surfaces 123 are arranged in a stepwise manner along the first direction 103.
It should be noted that, in some embodiments of the present application, the plurality of positive electrode output surfaces 113 are arranged in a stepped manner, and the plurality of negative electrode output surfaces 123 may be arranged in other manners; alternatively, the plurality of negative electrode output surfaces 123 are arranged in a stepped manner, and the plurality of positive electrode output surfaces 113 may be arranged in other manners; alternatively, the plurality of negative electrode lead-out surfaces 123 are arranged in a stepwise manner, and the plurality of positive electrode lead-out surfaces 113 are also arranged in a stepwise manner.
In the present embodiment, the plurality of negative electrode lead-out surfaces 123 are arranged in a stepwise manner, and the plurality of positive electrode lead-out surfaces 113 are arranged in a stepwise manner. The plurality of negative electrode lead-out surfaces 123 are opposite to the stepwise change direction of the plurality of positive electrode lead-out surfaces 113. In other words, the areas of the plurality of anode lead-out surfaces 123 gradually increase along the first direction 103; the areas of the plurality of positive electrode lead-out surfaces 113 gradually decrease.
The larger area anode lead-out surface 123 is not covered by the smaller area anode lead-out surface 123, and on this basis, the areas of the plurality of anode lead-out surfaces 123 gradually increase along the first direction 103; in the first direction 103, the anode lead-out surface 123 at the end is not covered, and in the embodiment of the present application, the shape of the anode lead-out surface 123 may be square, circular, semicircular, or irregular, for example, and in the first direction 103, the anode lead-out surface 123 at the end is not covered or blocked by the anode lead-out surface 123 at the front end. The embodiment of the present application is not limited in shape. Accordingly, in the embodiment of the present application, the shape and size of the positive electrode output surface 113 and the like are referred to the negative electrode output surface 123, and will not be described here. In the present application, the negative electrode lead-out surface 123 and the positive electrode lead-out surface 113 are described as rectangles, and further, the longer the lead-out surface length is, the larger the area is, the more the description will be given as an example.
Referring to fig. 2 again, in the present embodiment, the negative electrode output surface 123 and the positive electrode output surface 113 are located at opposite ends of the common electrode 102, and the common electrode 102 is configured as a double-sided tab.
In other embodiments of the present application, the negative electrode output surface 123 and the positive electrode output surface 113 may be located at the same end of the common electrode tab 102, and the common electrode tab 102 is configured as a single-side tab.
In this embodiment, the anode lead-out surface 123 and the anode conductive layer 121 are integrally provided, that is, the anode lead-out surface 123 and the anode conductive layer 121 are integrally formed together in the process of preparation, and accordingly, the cathode lead-out surface 113 and the cathode conductive layer 112 are integrally provided. In other embodiments of the present application, the anode lead-out surface 123 and the anode conductive layer 121 may be manufactured separately.
In this embodiment, the pole piece assembly 100 is made of the common pole pieces 102 and the separator 101 with different shapes and sizes, and it should be noted that in other embodiments of the present application, the pole piece assembly 100 may be formed by stacking the common pole pieces 102 with the same shapes and sizes in a stepped layer by layer.
Further, in the embodiment shown in fig. 1, along the first direction 103, the areas of the plurality of exit surfaces at one end of the pole piece assembly 100 are arranged in a gradually increasing manner, and the areas of the plurality of exit surfaces at the other end are arranged in a gradually decreasing manner; it will be appreciated that in other embodiments of the present application, the areas of the lead-out faces at both ends of the pole piece assembly 100 may all be arranged in a progressively increasing manner along the first direction 103; alternatively, the areas of the lead-out faces at both ends of the pole piece assembly 100 may all be arranged in a decreasing manner along the first direction 103.
The pole piece assembly 100 provided by the embodiments of the present application has the following advantages:
after the pole piece assembly 100 is wound or laminated, the cathode lead-out surface 123 and/or the anode lead-out surface 113 are arranged in a step shape, the cathode lead-out surface 123 or the anode lead-out surface 113 is stacked to form a pole lug, then the pole lug is connected with the transfer piece, in the connection process, one transfer piece can be connected with each lead-out surface, the volume and the quality of the transfer piece can be reduced, the common pole piece 102 comprises an insulating support layer 110, the quality of the insulating support layer 110 is far smaller than that of a metal layer, and the energy density can be improved.
Example 2
Fig. 3 is a schematic structural diagram illustrating a first state of the battery cell 200 according to the embodiment of the present application, please refer to fig. 2 and fig. 3 together, and the battery cell 200 according to the embodiment of the present application includes a positive electrode tab 210, a negative electrode tab 220, and the pole piece assembly 100 described in embodiment 1. The battery cell 200 shown in fig. 3 is in a state in which the positive electrode tab 210 and the negative electrode tab 220 are not yet connected to the pole piece assembly 100 after winding. The dashed line in fig. 3 represents the pole piece assembly 100 prior to winding.
After the pole piece assembly 100 is wound or laminated, a plurality of negative electrode output surfaces 123 are stacked to form a negative electrode tab, the negative electrode tab is connected with a negative electrode switching piece 220, a plurality of positive electrode output surfaces 113 are stacked to form a positive electrode tab, and the positive electrode tab is connected with a positive electrode switching piece 210.
Fig. 4 shows a schematic view of the positive electrode lead-out surface 113 after winding the common electrode sheet 102 according to the embodiment of the present application.
Referring to fig. 4, in the example shown in fig. 4, a plurality of common electrode sheets 102 are stacked and then wound, the direction in which the positive electrode conductive layer 112 of the common electrode sheet 102 faces before winding after stacking is defined as a first direction 103, and along the first direction 103, the area of the positive electrode lead-out surface 113 located in the middle gradually increases. In other words, the length of the positive electrode lead-out surface 113 at the edge position is smaller, and the closer to the intermediate position, the longer the positive electrode lead-out surface 113 is. The area of the positive electrode lead-out surface 113 increases gradually and then decreases gradually along the first direction 103.
The plurality of positive electrode lead-out surfaces 113 are stacked and then connected to the positive electrode tab 210; since the area of the positive electrode lead-out surface 113 located in the middle is large, after a plurality of positive electrode lead-out surfaces 113 are stacked, the end portion of each positive electrode lead-out surface 113 is exposed, and each positive electrode lead-out surface 113 can be connected to the positive electrode tab 210 during the connection to the positive electrode tab 210. The two positive electrode transfer sheets 210 can be connected with each positive electrode output surface 113, and the mode that each positive electrode output surface 113 is connected with one positive electrode transfer sheet 210 and then all positive electrode transfer sheets 210 are connected is not needed, so that the weight and occupied volume of the positive electrode transfer sheets 210 are reduced, and the purpose of increasing energy density is achieved.
In the example shown in fig. 4, the positive electrode tab 210 clamps each positive electrode lead-out surface 113, and the portion of each positive electrode lead-out surface 113 exposed to the pole piece assembly 100 is connected to the positive electrode tab 210, and the positive electrode tab 210 clamps each positive electrode lead-out surface 113, so that the flow guiding effect can be increased. Further, the positive electrode tab 210 and the positive electrode output surface 113 may be connected by welding, clamping, or abutting, for example.
It is to be understood that the "two-piece positive electrode tab 210" may be a two-piece positive electrode tab 210 formed by bending a single piece of positive electrode tab 210.
In fig. 4, along the first direction 103, the area of the positive electrode output surface 113 is first increased to the longest positive electrode output surface 113 in the middle, and then the area is sequentially decreased; in a specific manufacturing process, the three common electrode pieces 102 corresponding to the positive electrode output surface 113 with the shorter area to the longest middle are wound, in other words, the common electrode piece 102 corresponding to the positive electrode output surface 113 with the shorter area to the longest middle is one end of the electrode piece assembly 100 along the first direction 103, and the common electrode piece 102 corresponding to the positive electrode output surface 113 with the larger area to the shorter edge is the other end of the electrode piece assembly 100. It is understood that in fig. 4, the pole piece assembly 100 of the battery cell 200 includes three common pole pieces 102, and it should be noted that, in other embodiments of the present application, the battery cell 200 may include two, four, five or more common pole pieces 102, and the number of the common pole pieces 102 in the battery cell 200 is not limited in this application.
Fig. 5 shows a further schematic view of the positive electrode lead-out surface 113 after winding the common electrode sheet 102 provided in an embodiment of the present application.
Referring to fig. 5, in the example shown in fig. 5, a plurality of common electrode sheets 102 are stacked and then wound, the direction in which the positive electrode conductive layer 112 of the common electrode sheet 102 faces before winding after stacking is defined as a first direction 103, and along the first direction 103, the area of the positive electrode lead-out surface 113 located in the middle gradually decreases. In other words, the longer the positive electrode lead-out surface 113 at the edge position is, the smaller the length of the positive electrode lead-out surface 113 is as the closer to the intermediate position is. The area of the positive electrode lead-out surface 113 decreases gradually and then increases gradually along the first direction 103.
The plurality of positive electrode lead-out surfaces 113 are stacked and then connected to the positive electrode tab 210; the plurality of positive electrode lead-out surfaces 113 of the wound pole piece assembly 100 are in a step shape, the end part of each positive electrode lead-out surface 113 cannot contact with the adjacent insulating support layer 110, the end part of the positive electrode rotating sheet 210 extends between the two positive electrode lead-out surfaces 113 positioned at the most middle position, and then each positive electrode lead-out surface 113 is connected with the positive electrode rotating sheet 210. The connection mode can adopt a piece of switching sheet to be connected with each positive electrode leading-out surface 113, which is beneficial to reducing the weight and occupied volume of the positive electrode switching sheet 210 and realizing the purpose of increasing the energy density.
In the embodiment shown in fig. 5, all the positive electrode lead-out surfaces 113 sandwich one positive electrode rotation tab 210 together at a portion not in contact with the adjacent insulating support layer 110; in other words, all the positive electrode lead-out surfaces 113 are located on both sides of the positive electrode tab 210, and the positive electrode tab 210 is sandwiched from both sides of the positive electrode tab 210 to connect the two. Accordingly, the positive electrode tab 210 and the positive electrode output surface 113 may be connected by welding, clamping, or abutting, for example.
In the embodiment shown in fig. 5, the pole piece assembly 100 of the battery cell 200 includes three common pole pieces 102, and in fig. 5, the upper three positive electrode output surfaces 113 are one end of the pole piece assembly 100, and the lower three positive electrode output surfaces 113 are the other end of the pole piece assembly 100; the positive electrode leading-out surfaces 113 before winding face the same direction of the pole piece assembly 100, the positive electrode leading-out surfaces 113 at the two ends after winding face opposite directions respectively, and two positive electrode leading-out surfaces 113 positioned at the most middle position are arranged opposite to each other, and the end part of the positive electrode rotating sheet 210 extends between the two positive electrode leading-out surfaces 113, so that current can be led out.
In other embodiments of the present application, the cell 200 of the embodiment shown in fig. 5 may include two, four, five or more common pole pieces 102, and the number of common pole pieces 102 in the cell 200 is not limited in this application.
Further, in the embodiment of the present application, the stacking manner of the plurality of positive electrode output surfaces 113 shown in fig. 4 and 5 is not limited to the manner in which the plurality of common electrode sheets 102 are wound, and for example, the stacking manner in which the plurality of positive electrode output surfaces 113 shown in fig. 4 or 5 are formed by stacking six common electrode sheets 102 may be adopted.
Fig. 6 shows a schematic view of the positive lead-out surface 113 after lamination of the common electrode sheet 102 according to an embodiment of the present application.
Referring to fig. 6, in the embodiment shown in fig. 6, the plurality of common electrode sheets 102 are laminated, and then the plurality of positive electrode output surfaces 113 are connected to the positive electrode switching sheet 210.
After the plurality of common electrode plates 102 are laminated, the positive electrode leading-out surfaces 113 positioned at the end parts of the plurality of common electrode plates 102 are in a step shape, the direction in which the positive electrode conductive layers 112 of the common electrode plates 102 face is defined as a first direction 103, the areas of the plurality of positive electrode leading-out surfaces 113 are gradually increased along the first direction 103, after the plurality of positive electrode leading-out surfaces 113 are stacked, the end parts of the positive electrode leading-out surfaces 113 are exposed, and in the process of being connected with the positive electrode switching pieces 210, each positive electrode leading-out surface 113 can be connected with the positive electrode switching pieces 210. The adoption of one positive electrode rotating sheet 210 can lead out with each positive electrode, which is beneficial to reducing the weight and occupied volume of the positive electrode rotating sheet 210 and realizing the purpose of increasing the energy density.
In other embodiments of the present application, the cell 200 of the embodiment shown in fig. 6 may include two, four, five or more common pole pieces 102, and the number of common pole pieces 102 in the cell 200 is not limited in this application.
Fig. 7 shows a schematic view of the positive electrode lead-out surface 113 after lamination of the common electrode sheet 102 according to an embodiment of the present application.
Referring to fig. 6 and fig. 7, in the embodiment shown in fig. 6, the direction in which the positive conductive layer 112 of the common electrode 102 faces is defined as the first direction 103.
Fig. 7 differs from fig. 6 in that the areas of the plurality of positive electrode lead-out surfaces 113 decrease one by one in the first direction 103. Accordingly, the use of one positive electrode tab 210 can be used to guide out each positive electrode, which is advantageous in reducing the weight and occupied volume of the positive electrode tab 210, and in achieving the purpose of increasing the energy density.
The number of common pole pieces 102 in the example shown in fig. 7 is not limited in this application.
Referring to fig. 4 to fig. 7 together, in the present application, the negative electrode output surface 123 after lamination of the plurality of common electrode sheets 102 may be the one shown in fig. 6 or fig. 7, and the negative electrode output surface 123 after winding of the plurality of common electrode sheets 102 may be the one shown in fig. 4 or fig. 5. The embodiments of the present application will not be described in detail. The stacked form of the negative electrode output surface 123 and the positive electrode output surface 113 may be the same or different.
Referring to fig. 3 again, in the embodiment shown in fig. 3, the negative electrode output surface 123 and the positive electrode output surface 113 are respectively located at two ends of the common electrode 102, and it is understood that in other embodiments of the present application, the negative electrode output surface 123 and the positive electrode output surface 113 may be both located at one end of the common electrode 102.
It should be further noted that, in the embodiment of the present application, the electrode assembly 100 shown in fig. 1 is used to prepare the battery cell 200, and in other embodiments of the present application, other electrode assemblies 100 may be used to prepare the battery cell 200, for example, a plurality of common electrode plates 102 with the same shape and area may be wound to form the battery cell 200, and during the winding process, two ends of the common electrode plates 102 are arranged according to a certain rule (for example, in a stepped arrangement), and then the battery cell is wound to form the mode shown in fig. 4, 5, 6 or 7.
The battery cell 200 provided in the embodiment of the application has at least the following advantages:
the conductive surfaces of the plurality of common pole pieces 102 are arranged in a certain order, and only one or two switching pieces can be connected with each conductive surface, so that the volume and the weight of the switching pieces can be reduced, and the energy density is improved. In addition, the common electrode plate includes the insulating support layer 110, and the mass of the insulating support layer 110 is far smaller than that of the metal layer, so that the energy density of the battery cell 200 can be further reduced.
The application also provides a battery, which comprises a battery cell 200 and a shell, wherein the battery cell 200 is accommodated in the shell.
Accordingly, the battery provided by the application is high in energy density.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A pole piece assembly, the pole piece assembly comprising:
a diaphragm; and
a plurality of sequentially stacked common pole pieces, wherein two adjacent common pole pieces are separated by the diaphragm;
each common pole piece comprises a first polar active layer, a first polar conductive layer, an insulating support layer, a second polar conductive layer and a second polar active layer which are sequentially stacked; the first polar conductive layer of each common pole piece faces to the same side of the thickness direction of the common pole piece;
each common pole piece is provided with a first polarity tab and a second polarity tab; the first polar lug only comprises a first polar guide surface attached to the insulating support layer; the first polarity conductive layer is electrically connected with the first polarity leading-out surface; the second polar lug only comprises a second polar guide surface attached to the insulating support layer, and the second polar guide surface is electrically connected with the second polar conductive layer;
the first polarity leading-out surfaces and/or the second polarity leading-out surfaces are arranged in a step shape along the thickness direction of the common pole piece, so that after the common pole pieces are overlapped, each first polarity leading-out surface is at least partially exposed to the surface, and each second polarity leading-out surface is at least partially exposed to the surface;
the first polarity and the second polarity are opposite, and the insulating support layer is made of a high polymer material.
2. The pole piece assembly of claim 1, wherein the areas of the plurality of first polarity exit faces are progressively increasing and the areas of the plurality of second polarity exit faces are progressively decreasing along the thickness of the common pole piece.
3. A pole piece assembly according to claim 1 or 2, wherein the first polarity lead-out face and the second polarity lead-out face extend in opposite directions.
4. A battery cell comprising a first polarity-switching tab, a second polarity-switching tab, and the pole piece assembly of any one of claims 1-3; the plurality of first polarity leading-out surfaces are connected with the first polarity switching sheet; the plurality of second polarity leading-out surfaces are connected to the second polarity switching pieces.
5. The cell of claim 4, wherein the electrode is electrically connected to the electrode,
after the pole piece assembly is wound, the first polarity switching piece is connected with the part of each first polarity leading-out surface, which is not contacted with the adjacent insulating support layer, and the first polarity switching piece clamps each first polarity leading-out surface; the second polarity switching sheet end part extends into a position between two second polarity leading-out surfaces positioned at the middle position, and the second polarity switching sheet is connected with a part of each second polarity leading-out surface which is not contacted with the adjacent insulating supporting layer; the plurality of second polarity leading-out surfaces commonly hold the second polarity switching sheet.
6. A battery cell, wherein the battery cell comprises:
a first polarity switching sheet;
a second polarity switching tab;
a diaphragm; and
a plurality of common pole pieces; adjacent two common pole pieces are separated by the diaphragm;
each common pole piece comprises a first polar active layer, a first polar conductive layer, an insulating support layer, a second polar conductive layer and a second polar active layer which are sequentially stacked; the first polar conductive layer of each common pole piece faces to the same side of the thickness direction of the common pole piece;
the end part of each common pole piece is provided with a first polarity leading-out surface electrically connected with the first polarity conductive layer and a second polarity leading-out surface electrically connected with the second polarity conductive layer;
the area of the first polar guide surface positioned in the middle part is gradually increased or reduced along the thickness direction of the common pole piece; or, along the thickness direction of the common pole piece, the area of the first polarity leading-out surface is gradually increased or reduced;
the area of the second polarity leading-out surface positioned in the middle part is gradually increased or decreased along the thickness direction of the common pole piece; or, along the thickness direction of the common pole piece, the area of the second polarity leading-out surface is gradually increased or reduced;
each first polarity leading-out surface is connected with the first polarity switching piece; each second polarity leading-out surface is connected with the second polarity switching sheet;
wherein the first polarity is opposite to the second polarity.
7. The cell of claim 6, wherein a portion of each of the first polarity-directing faces that is not in contact with an adjacent insulating support layer is sandwiched by the first polarity-switching tabs; all the parts of the second polarity leading-out surface which are not contacted with the adjacent insulating support layer commonly clamp one second polarity switching sheet.
8. The cell of claim 6, wherein the first polar lead-out face and the second polar lead-out face extend in opposite directions.
9. The cell of claim 6, wherein the first polarity-switching tab is snapped or welded to the first polarity-guiding surface.
10. A battery comprising a housing and the cell of any one of claims 4-9, the cell being housed within the housing.
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| CN202110232746.5A CN112838259B (en) | 2021-03-02 | 2021-03-02 | Pole piece assembly, battery core and battery |
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| CN202110232746.5A CN112838259B (en) | 2021-03-02 | 2021-03-02 | Pole piece assembly, battery core and battery |
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| CN112838259B true CN112838259B (en) | 2024-03-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113300056A (en) * | 2021-06-25 | 2021-08-24 | 厦门海辰新能源科技有限公司 | Tab connecting assembly, single battery, tab and adapter plate connecting method |
| CN114361726B (en) * | 2021-07-15 | 2024-02-27 | 北京卫蓝新能源科技有限公司 | Soft package battery module |
| WO2024031353A1 (en) * | 2022-08-09 | 2024-02-15 | 宁德时代新能源科技股份有限公司 | Electrode sheet, electrode assembly, battery cell, battery and electric device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017200891A1 (en) * | 2016-01-22 | 2017-07-27 | GM Global Technology Operations LLC | Machining a bag-shaped cell and attaching a tab to an electrode |
| CN111312976A (en) * | 2019-10-21 | 2020-06-19 | 新余赣锋电子有限公司 | Soft-packaged battery cell packaged by lead in any direction |
| CN111883740A (en) * | 2018-06-22 | 2020-11-03 | 宁德时代新能源科技股份有限公司 | Pole piece and secondary battery |
| CN112117497A (en) * | 2020-10-09 | 2020-12-22 | 昆山聚创新能源科技有限公司 | Battery cell and battery cell forming method |
| CN214797496U (en) * | 2021-03-02 | 2021-11-19 | 厦门海辰新材料科技有限公司 | Pole piece assembly, battery core and battery |
-
2021
- 2021-03-02 CN CN202110232746.5A patent/CN112838259B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017200891A1 (en) * | 2016-01-22 | 2017-07-27 | GM Global Technology Operations LLC | Machining a bag-shaped cell and attaching a tab to an electrode |
| CN111883740A (en) * | 2018-06-22 | 2020-11-03 | 宁德时代新能源科技股份有限公司 | Pole piece and secondary battery |
| CN111312976A (en) * | 2019-10-21 | 2020-06-19 | 新余赣锋电子有限公司 | Soft-packaged battery cell packaged by lead in any direction |
| CN112117497A (en) * | 2020-10-09 | 2020-12-22 | 昆山聚创新能源科技有限公司 | Battery cell and battery cell forming method |
| CN214797496U (en) * | 2021-03-02 | 2021-11-19 | 厦门海辰新材料科技有限公司 | Pole piece assembly, battery core and battery |
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