CN112838259A - Pole piece assembly, battery core and battery - Google Patents

Pole piece assembly, battery core and battery Download PDF

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Publication number
CN112838259A
CN112838259A CN202110232746.5A CN202110232746A CN112838259A CN 112838259 A CN112838259 A CN 112838259A CN 202110232746 A CN202110232746 A CN 202110232746A CN 112838259 A CN112838259 A CN 112838259A
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China
Prior art keywords
polarity
pole piece
leading
out surface
common pole
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Granted
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CN202110232746.5A
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Chinese (zh)
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CN112838259B (en
Inventor
周龙
唐阳
郭敏
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Xiamen Haichen New Material Technology Co ltd
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Xiamen Haichen New Material Technology Co ltd
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The application relates to the field of batteries, in particular to a pole piece assembly, a battery core and a battery. A pole piece assembly comprises a diaphragm and a plurality of common pole pieces stacked in sequence, wherein first polarity leading-out surfaces and/or second polarity leading-out surfaces of the common pole pieces are/is arranged in a step shape; the first polarity is opposite to the second polarity. After the pole piece assembly of this application is convoluteed or the lamination, negative pole derivation face and/or anodal derivation are personally submitted the echelonment and are arranged, form utmost point ear after negative pole derivation face or anodal derivation face pile, then utmost point ear is connected with the switching piece, at this connection process, a switching piece can be connected with every derivation face, reduce the volume and the quality of switching piece, the pole piece of sharing includes insulating supporting layer, insulating supporting layer quality is far less than the metal level, can improve energy density.

Description

Pole piece assembly, battery core and battery
Technical Field
The application relates to the field of batteries, in particular to a pole piece assembly, a battery core and a battery.
Background
The connection mode between the electrode assembly and the top cover sheet of the secondary battery is mainly as follows: the pole ear of the electrode assembly is welded with the adapter plate, and then the adapter plate is assembled on the top cover plate in a laser welding mode.
However, the contact area between the tab and the interposer is large, so that the tab and the interposer occupy a large space inside the secondary battery, resulting in a low energy density of the secondary battery.
Disclosure of Invention
An object of the embodiment of the application is to provide a pole piece assembly, a battery cell and a battery, which aim at improving the energy density of the battery.
This application first aspect provides a pole piece assembly, pole piece assembly includes:
a diaphragm; and
a plurality of common pole pieces stacked in sequence, wherein two adjacent common pole pieces are separated by the diaphragm;
each common pole piece comprises a first polarity active layer, a first polarity conducting layer, an insulating supporting layer, a second polarity conducting layer and a second polarity active layer which are sequentially stacked; the first polarity conducting layer of each common pole piece faces to the same side of the thickness direction of the common pole piece;
each shared pole piece is provided with a first polar lug and a second polar lug; the first polar lug only comprises a first polar leading-out surface attached to the insulating support layer; the first polarity conducting layer is electrically connected with the first polarity leading-out surface; the second polarity tab only comprises a second polarity leading-out surface attached to the insulating support layer, and the second polarity leading-out surface is electrically connected with the second polarity conductive layer;
along the thickness direction of the common pole piece, the first polarity leading-out surfaces and/or the second polarity leading-out surfaces are arranged in a step shape, so that after the common pole pieces are overlapped, at least part of each first polarity leading-out surface is exposed to the surface, and at least part of each second polarity leading-out surface is exposed to the surface;
wherein the first polarity is opposite to the second polarity.
After the pole piece assembly of this application is convoluteed or the lamination, negative pole derivation face and/or anodal derivation are personally submitted the echelonment and are arranged, form utmost point ear after negative pole derivation face or anodal derivation face pile, then utmost point ear is connected with the switching piece, at this connection process, a switching piece can be connected with every derivation face, reduce the volume and the quality of switching piece, the pole piece of sharing includes insulating supporting layer, insulating supporting layer quality is far less than the metal level, can improve energy density.
In some embodiments of the first aspect of the present application, along the thickness direction of the common pole piece, the areas of the plurality of first polarity-deriving surfaces gradually increase, and the sizes of the plurality of second polarity-deriving surfaces gradually decrease.
In some embodiments of the first aspect of the present application, the first polarity lead-out face extends in the opposite direction to said second polarity lead-out face.
A second aspect of the present application provides an electrical core, where the electrical core includes a first polarity patch, a second polarity patch, and the above-mentioned pole piece assembly; the plurality of first polarity leading-out surfaces are connected with the first polarity adapter sheet; and the second polarity leading-out surfaces are connected with the second polarity adapter plate.
In some embodiments of the second aspect of the present application, after winding of the pole piece assembly, the first polarity adapter sheet is connected to a portion of each of the first polarity lead-out surfaces that is not in contact with the adjacent insulating support layer, and the first polarity adapter sheet holds each of the first polarity lead-out surfaces; the end part of the second polarity adapter sheet extends into the space between the two second leading-out surfaces positioned in the middle, and the second polarity adapter sheet is connected with the part of each second polarity leading-out surface, which is not contacted with the adjacent insulating support layer; the second pole adapter is clamped by the second lead-out surfaces together.
This application third aspect electric core, electric core includes:
a first polarity patch;
a second polarity patch;
a diaphragm; and
a plurality of common pole pieces; two adjacent shared pole pieces are separated by the diaphragm;
each common pole piece comprises a first polarity active layer, a first polarity conducting layer, an insulating supporting layer, a second polarity conducting layer and a second polarity active layer which are sequentially stacked; the first polarity conducting 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 conducting layer and a second polarity leading-out surface electrically connected with the second polarity conducting layer;
along the thickness direction of the common pole piece, the area of the first polarity leading-out surface positioned in the middle part is gradually increased or decreased; or along the thickness direction of the common pole piece, the area of the first polarity leading-out surface is gradually increased or decreased;
along the thickness direction of the shared pole piece, the area of the second polarity leading-out surface positioned in the middle part is gradually increased or decreased; or along the thickness direction of the common pole piece, the area of the second polarity derivation surface is gradually increased or decreased;
each first polarity leading-out surface is connected with the first polarity adapter sheet; each second polarity leading-out surface is connected with the second polarity adapter plate;
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 lead-out surfaces, which is not in contact with the adjacent insulating support layer, is sandwiched by the first polarity transfer sheet; and the parts of all the second polarity leading-out surfaces, which are not in contact with the adjacent insulating support layer, jointly clamp one second polarity adapter sheet.
In some embodiments of the third aspect of the present application, the first polarity lead-out face extends in the opposite direction to said second polarity lead-out face.
In some embodiments of the third aspect of the present application, the first polarity patch is snapped or welded to the first polarity lead-out surface.
A battery comprises a shell and the battery cell, wherein the battery cell is accommodated in the shell.
The conducting surfaces of the shared pole pieces are arranged in a certain sequence, only one or two adapter pieces can be connected with each conducting surface, the size and the weight of the adapter pieces can be reduced, and therefore the energy density is improved. In addition, the shared pole piece comprises an insulating support layer, and the mass of the insulating support 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 required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a schematic structural diagram of a pole piece assembly provided in an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a common pole piece provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram illustrating a first state of a cell provided in an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a positive electrode lead-out surface after winding of a common electrode sheet provided in an embodiment of the present application;
fig. 5 is a schematic view illustrating a positive electrode lead-out surface after winding of a common electrode sheet according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a positive lead-out face after sharing a pole piece stack according to an embodiment of the present application;
fig. 7 shows another schematic diagram of the positive electrode lead-out surface after sharing the pole piece stack according to the embodiment of the present application.
Icon: 100-a pole piece assembly; 101-a membrane; 102-a common pole piece; 103-a first direction; 110-an insulating support layer; 111-positive active layer; 112-positive conductive layer; 113-positive pole leading-out surface; 121-negative conductive layer; 122-negative active layer; 123-negative pole leading-out surface; 200-electric core; 210-a positive electrode patch; 220-negative pole adapter plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example 1
Fig. 1 shows a schematic structural diagram of a pole piece assembly 100 provided in an embodiment of the present application, please refer to fig. 1, the embodiment provides a pole piece assembly 100, and the pole piece assembly 100 includes a plurality of diaphragms 101 and a plurality of common pole pieces 102. Two adjacent common pole pieces 102 are each separated by a diaphragm 101.
Fig. 2 is a schematic cross-sectional view of the common pole piece 102 according to an embodiment of the present application, please refer to fig. 2.
The common electrode plate 102 includes a second polarity active layer, a second polarity conductive layer, an insulating support layer 110, a first polarity conductive layer, and a first polarity active layer, which are sequentially stacked; one direction of the thickness of the common pole pieces 102 is now defined as a first direction 103, and the first polarity conductive layer of each common pole piece 102 is arranged toward the first direction 103;
in the present 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 the present application, the first polarity may be a negative electrode, and the second polarity may be a positive electrode.
The common electrode tab 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 polyamide, polyimide, polyester, polyolefin, epoxy resin, or 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 in this application.
Each common pole piece 102 is provided with a positive pole tab and a negative pole tab; the positive electrode tab includes only a positive electrode lead-out surface 113 to which the positive electrode conductive layer 112 is electrically connected, and the positive electrode lead-out surface 113 is attached to the insulating support layer 110. The negative electrode tab includes only a negative electrode lead-out surface 123 to which the negative electrode conductive layer 121 is electrically connected, and the negative electrode lead-out surface 123 is attached to the insulating support layer 110.
The end of each common pole piece 102 is provided with a negative electrode lead-out surface 123 electrically connected to the negative electrode conductive layer 121.
A plurality of common pole pieces 102 are arranged in a stacked manner, and the direction of each common pole piece 102 faces to a first direction 103; along the first direction 103, the plurality of positive electrode lead-out surfaces 113 are arranged in a step shape.
In the present embodiment, the plurality of negative electrode lead-out surfaces 123 are arranged in a step shape along the first direction 103.
It should be noted that, in some embodiments of the present application, the plurality of positive electrode lead-out surfaces 113 are arranged in a step shape, and the plurality of negative electrode lead-out surfaces 123 may be arranged in other manners; alternatively, the plurality of negative electrode lead-out surfaces 123 are arranged in a step shape, and the plurality of positive electrode lead-out surfaces 113 may be arranged in other manners; alternatively, the plurality of negative electrode lead-out surfaces 123 are arranged in a step shape, and the plurality of positive electrode lead-out surfaces 113 are also arranged in a step shape.
In the present embodiment, the plurality of negative electrode lead-out surfaces 123 are arranged in a step shape, and the plurality of positive electrode lead-out surfaces 113 are arranged in a step shape. The negative electrode lead-out surfaces 123 and the positive electrode lead-out surfaces 113 have a step change direction opposite to each other. In other words, along the first direction 103, the areas of the plurality of negative electrode lead-out surfaces 123 gradually increase; the areas of the plurality of positive electrode lead-out surfaces 113 gradually decrease.
The negative electrode lead-out surface 123 with a large area is not covered by the negative electrode lead-out surface 123 with a small area, and on the basis, the areas of the negative electrode lead-out surfaces 123 gradually increase along the first direction 103; the negative electrode leading-out surface 123 at the end is not covered along the first direction 103, and in the embodiment of the present application, the shape of the negative electrode leading-out surface 123 may be, for example, a square, a circle, a semicircle, or a special shape, and along the first direction 103, the negative electrode leading-out surface 123 at the end is not covered or shielded by the negative electrode leading-out surface 123 at the front end. The shape of the embodiment of the present application is not limited. Accordingly, in the embodiment of the present application, the shape, size, and the like of the positive electrode lead-out surface 113 refer to the negative electrode lead-out surface 123, and are not described herein again. In the present application, the negative electrode lead-out surface 123 and the positive electrode lead-out surface 113 are described as being rectangular, and the length of the lead-out surface is described as being longer as the area is larger.
Referring to fig. 2 again, in the present embodiment, the negative lead-out surface 123 and the positive lead-out surface 113 are located at two opposite ends of the common pole piece 102, and the common pole piece 102 is configured to have two-sided tab.
In other embodiments of the present application, the negative electrode lead-out surface 123 and the positive electrode lead-out surface 113 may be located at the same end of the common pole piece 102, and the common pole piece 102 may be configured to be a single-side tab.
In this embodiment, the negative electrode lead-out surface 123 is integrally provided with the negative electrode conductive layer 121, that is, the negative electrode lead-out surface 123 and the negative electrode conductive layer 121 are integrally formed in the manufacturing process, and accordingly, the positive electrode lead-out surface 113 is integrally provided with the positive electrode conductive layer 112. In other embodiments of the present application, the negative electrode lead-out surface 123 and the negative electrode conductive layer 121 may be formed separately.
In this embodiment, the pole piece assembly 100 is made of the common pole pieces 102 and the diaphragms 101 with different shapes and sizes, and it should be noted that in other embodiments of the present application, the pole piece assembly 100 can be formed by stacking the common pole pieces 102 with the same shapes and sizes in a stepped manner layer by layer.
Further, in the embodiment shown in fig. 1, along the first direction 103, the areas of the plurality of leading-out surfaces at one end of the pole piece assembly 100 are arranged in a gradually increasing manner, and the areas of the plurality of leading-out surfaces at the other end are arranged in a gradually decreasing manner; it is understood that in other embodiments of the present application, along the first direction 103, the areas of the leading-out surfaces at both ends of the pole piece assembly 100 may be arranged in a gradually increasing manner; alternatively, the areas of the lead-out surfaces at both ends of the pole piece assembly 100 along the first direction 103 may be arranged in a gradually decreasing manner.
The pole piece assembly 100 provided by the embodiment of the application has the following advantages:
after the pole piece assembly 100 of the application is wound or laminated, the negative pole leading-out surface 123 and/or the positive pole leading-out surface 113 are arranged in a step shape, the negative pole leading-out surface 123 or the positive pole leading-out surface 113 form a pole lug after being stacked, then the pole lug is connected with the adapter plate, in the connection process, one adapter plate can be connected with each leading-out surface, the size and the quality of the adapter plate can be reduced, the common pole piece 102 comprises the 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 shows a schematic structural diagram of a first state of a battery cell 200 provided in an embodiment of the present application, please refer to fig. 2 and fig. 3 together, where the battery cell 200 provided in the embodiment of the present application includes a positive electrode interposer 210, a negative electrode interposer 220, and the pole piece assembly 100 described in embodiment 1. In the battery cell 200 shown in fig. 3, after winding, the positive electrode tab 210 and the negative electrode tab 220 are not yet connected to the pole piece assembly 100. The dotted line in fig. 3 represents the pole piece assembly 100 prior to winding.
After the pole piece assembly 100 is wound or laminated, the plurality of negative lead-out surfaces 123 are stacked to form negative electrode tabs, the negative electrode tabs are connected with the negative adapter plate 220, the plurality of positive lead-out surfaces 113 are stacked to form positive electrode tabs, and the positive electrode tabs are connected with the positive adapter plate 210.
Fig. 4 is a schematic diagram illustrating the positive electrode lead-out surface 113 after the common electrode sheet 102 is wound according to the embodiment of the present application.
Referring to fig. 4, in the example shown in fig. 4, the plurality of common electrode tabs 102 are stacked and then wound, a direction in which the positive electrode conductive layer 112 of the common electrode tab 102 faces before winding after stacking is defined as a first direction 103, and an area of the positive electrode lead-out surface 113 located in the middle is gradually increased along the first direction 103. In other words, the length of the positive electrode lead-out surface 113 at the edge position is small, and the length of the positive electrode lead-out surface 113 increases as the position approaches the middle position. Along the first direction 103, the area of the positive electrode lead-out surface 113 gradually increases and then gradually decreases.
The plurality of positive electrode lead-out surfaces 113 are stacked and then connected to the positive electrode interposer 210; because the area of the anode lead-out surface 113 located in the middle is large, after the plurality of anode lead-out surfaces 113 are stacked, the end of each anode lead-out surface 113 is exposed, and in the process of connecting with the anode adapter sheet 210, each anode lead-out surface 113 can be connected with the anode adapter sheet 210. Two positive pole adapter plates 210 can be connected with each positive pole leading-out surface 113, and a mode that each positive pole leading-out surface 113 is connected with one positive pole adapter plate 210 and then all the positive pole adapter plates 210 are connected is not needed, so that the weight and the occupied volume of the positive pole adapter plates 210 are reduced, and the purpose of increasing the energy density is achieved.
In the example shown in fig. 4, the positive electrode adaptor sheet 210 clamps each positive electrode lead-out surface 113, and the portion of each positive electrode lead-out surface 113 exposed out of the pole piece assembly 100 is connected to the positive electrode adaptor sheet 210, and the positive electrode adaptor sheet 210 clamps each positive electrode lead-out surface 113, so that the flow guiding effect can be increased. Further, the connection mode of the positive electrode adaptor sheet 210 and the positive electrode lead-out surface 113 may be, for example, welding, clamping, or abutting.
It is understood that the "two positive electrode interposer 210" may also be two positive electrode interposers 210 formed by bending a whole positive electrode interposer 210.
It should be noted that, in fig. 4, along the first direction 103, the positive electrode leading-out surface 113 is first formed as one positive electrode leading-out surface 113 whose area is increased to be the longest in the middle, and then the areas are sequentially decreased; in the specific manufacturing process, the three common pole pieces 102 corresponding to the one positive electrode lead-out surface 113 with the area from short to the longest in the middle are wound, in other words, along the first direction 103, the common pole piece 102 corresponding to the one positive electrode lead-out surface 113 with the area from short to the longest in the middle is one end of the pole piece assembly 100, and the common pole piece 102 corresponding to the positive electrode lead-out surface 113 with the area from large in the middle to short in the edge is the other end of the pole piece assembly 100. It is to be understood that, in fig. 4, the pole piece assembly 100 of the battery cell 200 includes three common pole pieces 102, 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 present application does not limit the number of the common pole pieces 102 in the battery cell 200.
Fig. 5 shows another schematic diagram of the positive electrode lead-out surface 113 after the common electrode sheet 102 is wound according to the embodiment of the present application.
Referring to fig. 5, in the example shown in fig. 5, the plurality of common electrode tabs 102 are stacked and then wound, a direction in which the positive electrode conductive layer 112 of the common electrode tab 102 faces before winding after stacking is defined as a first direction 103, and an area of the positive electrode lead-out surface 113 located in the middle is gradually reduced along the first direction 103. In other words, the length of the positive electrode lead-out surface 113 at the edge position is large, and the length of the positive electrode lead-out surface 113 decreases toward the middle position. Along the first direction 103, the area of the positive electrode lead-out surface 113 gradually decreases and then gradually increases.
The plurality of positive electrode lead-out surfaces 113 are stacked and then connected to the positive electrode interposer 210; the plurality of positive electrode lead-out surfaces 113 of the wound pole piece assembly 100 are stepped, the end of each positive electrode lead-out surface 113 does not contact with the adjacent insulating support layer 110, the end of the positive electrode adapter sheet 210 extends into the space between the two positive electrode lead-out surfaces 113 at the most middle position, and then each positive electrode lead-out surface 113 is connected with the positive electrode adapter sheet 210. This connection mode can adopt a slice keysets can be connected with every positive pole derivation face 113, is favorable to reducing the weight of positive pole keysets 210 and the volume that occupies, realizes the purpose that increases energy density.
In the embodiment shown in fig. 5, all the portions of the positive electrode lead-out surface 113 not in contact with the adjacent insulating support layer 110 commonly hold a positive electrode interposer 210; in other words, all the positive electrode lead-out surfaces 113 are located on both sides of the positive electrode interposer 210, and the positive electrode interposer 210 is sandwiched between both sides of the positive electrode interposer 210 to connect the two. Accordingly, the positive electrode adaptor 210 and the positive electrode lead-out surface 113 may be connected by welding, clamping, or abutting.
In the embodiment shown in fig. 5, the pole piece assembly 100 of the battery cell 200 includes three common pole pieces 102, in fig. 5, the upper three positive electrode lead-out surfaces 113 are one end of the pole piece assembly 100, and the lower three positive electrode lead-out surfaces 113 are the other end of the pole piece assembly 100; the positive electrode leading-out surfaces 113 face the same direction of the pole piece assembly 100 before winding, the positive electrode leading-out surfaces 113 at two ends face opposite directions respectively after winding, and therefore the two positive electrode leading-out surfaces 113 at the most middle position are oppositely arranged, and the end part of the positive electrode adapter sheet 210 extends into the space between the two positive electrode leading-out surfaces 113, so that current can be led out.
In other embodiments of the present application, the battery cell 200 of the embodiment shown in fig. 5 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 the present application.
Further, in the embodiment of the present application, the stacking manner of the plurality of positive electrode lead-out surfaces 113 shown in fig. 4 and 5 is not limited to the manner in which the plurality of common pole pieces 102 are wound, and for example, the stacking manner in which the plurality of positive electrode lead-out surfaces 113 shown in fig. 4 or 5 are formed by stacking six common pole pieces 102 may be adopted.
Fig. 6 shows a schematic view of the laminated positive lead-out surface 113 of the common electrode sheet 102 according to the embodiment of the present application.
Referring to fig. 6, in the embodiment shown in fig. 6, the plurality of common electrode sheets 102 are stacked and then the plurality of positive electrode lead-out surfaces 113 are connected to the positive electrode adaptor sheet 210.
After the plurality of common electrode plates 102 are laminated, the positive electrode lead-out surfaces 113 at the ends of the plurality of common electrode plates 102 are in a step shape, the direction of the positive electrode conducting layer 112 of the common electrode plate 102 is defined as a first direction 103, the area of the plurality of positive electrode lead-out surfaces 113 is gradually increased along the first direction 103, after the plurality of positive electrode lead-out surfaces 113 are stacked, the end of each positive electrode lead-out surface 113 is exposed, and in the process of connecting with the positive electrode adapter plate 210, each positive electrode lead-out surface 113 can be connected with the positive electrode adapter plate 210. By adopting one positive electrode adapter sheet 210, the weight and the occupied volume of the positive electrode adapter sheet 210 can be reduced by leading out the positive electrode adapter sheet and each positive electrode, and the purpose of increasing the energy density is realized.
In other embodiments of the present application, the battery cell 200 of the embodiment shown in fig. 6 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 the present application.
Fig. 7 shows a schematic view of the laminated positive lead-out surface 113 of the common electrode sheet 102 according to the embodiment of the present application.
Referring to fig. 6 and 7, in the embodiment shown in fig. 6, the direction of the positive conductive layer 112 of the common electrode slice 102 is defined as a first direction 103.
Fig. 7 differs from fig. 6 in that the areas of the plurality of positive electrode lead-out surfaces 113 are gradually reduced along the first direction 103. Correspondingly, one positive electrode adapter sheet 210 can be led out together with each positive electrode, so that the weight and the occupied volume of the positive electrode adapter sheet 210 are reduced, and the purpose of increasing the energy density is achieved.
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 7, in the present application, the manner shown in fig. 6 or 7 may be adopted for the stacked negative lead-out surface 123 of the plurality of common electrode sheets 102, and the manner shown in fig. 4 or 5 may be adopted for the wound negative lead-out surface 123 of the plurality of common electrode sheets 102. The embodiments of the present application are not described in detail again. The stacking forms of the negative electrode lead-out surface 123 and the positive electrode lead-out surface 113 may be the same or different.
Referring to fig. 3 again, in the embodiment shown in fig. 3, the negative lead-out surface 123 and the positive lead-out surface 113 are respectively located at two ends of the common pole piece 102, and it can be understood that in other embodiments of the present application, the negative lead-out surface 123 and the positive lead-out surface 113 may be both located at one end of the common pole piece 102.
It should be further noted that, in the embodiment of the present application, the electrode core 200 is prepared by using the pole piece assembly 100 shown in fig. 1, and it should be noted that, in other embodiments of the present application, the electrode core 200 may be prepared by using other pole piece assemblies 100, for example, a plurality of common pole pieces 102 having the same shape and area may be wound to form the electrode core 200, during the winding process, two ends of the common pole piece 102 are arranged according to a certain rule (for example, in a step shape), and then the winding process is performed to form the manner shown in fig. 4, fig. 5, fig. 6, or fig. 7.
The battery cell 200 provided by the embodiment of the application has at least the following advantages:
the conducting surfaces of the multiple shared pole pieces 102 are arranged in a certain sequence, only one or two adapter pieces can be connected with each conducting surface, the size and the weight of the adapter pieces can be reduced, and therefore the energy density is improved. In addition, the common pole piece includes the insulating support layer 110, and the mass of the insulating support layer 110 is much 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 energy density of the battery provided by the application is larger.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A pole piece assembly, comprising:
a diaphragm; and
a plurality of common pole pieces stacked in sequence, wherein two adjacent common pole pieces are separated by the diaphragm;
each common pole piece comprises a first polarity active layer, a first polarity conducting layer, an insulating supporting layer, a second polarity conducting layer and a second polarity active layer which are sequentially stacked; the first polarity conducting layer of each common pole piece faces to the same side of the thickness direction of the common pole piece;
each shared pole piece is provided with a first polar lug and a second polar lug; the first polar lug only comprises a first polar leading-out surface attached to the insulating support layer; the first polarity conducting layer is electrically connected with the first polarity leading-out surface; the second polarity tab only comprises a second polarity leading-out surface attached to the insulating support layer, and the second polarity leading-out surface is electrically connected with the second polarity conductive layer;
along the thickness direction of the common pole piece, the first polarity leading-out surfaces and/or the second polarity leading-out surfaces are arranged in a step shape, so that after the common pole pieces are overlapped, at least part of each first polarity leading-out surface is exposed to the surface, and at least part of each second polarity leading-out surface is exposed to the surface;
wherein the first polarity is opposite to the second polarity.
2. The pole piece assembly of claim 1 wherein the plurality of first polarity lead-out faces have progressively increasing areas and the plurality of second polarity lead-out faces have progressively decreasing areas 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 extends in the opposite direction to the second polarity lead-out face.
4. A cell comprising a first polarity patch, a second polarity patch, and the pole piece assembly of any of claims 1-3; the plurality of first polarity leading-out surfaces are connected with the first polarity adapter sheet; and the second polarity leading-out surfaces are connected with the second polarity adapter plate.
5. The cell of claim 4, wherein,
after the pole piece assembly is wound, the first polarity adapter sheet is connected with the part, which is not contacted with the adjacent insulating support layer, of each first polarity leading-out surface, and the first polarity adapter sheet clamps each first polarity leading-out surface; the end part of the second polarity adapter sheet extends into the space between the two second polarity leading-out surfaces positioned in the middle, and the second polarity adapter sheet is connected with the part of each second polarity leading-out surface, which is not contacted with the adjacent insulating support layer; the second polarity adapter sheet is clamped by the second polarity leading-out surfaces together.
6. A battery cell, comprising:
a first polarity patch;
a second polarity patch;
a diaphragm; and
a plurality of common pole pieces; two adjacent shared pole pieces are separated by the diaphragm;
each common pole piece comprises a first polarity active layer, a first polarity conducting layer, an insulating supporting layer, a second polarity conducting layer and a second polarity active layer which are sequentially stacked; the first polarity conducting 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 conducting layer and a second polarity leading-out surface electrically connected with the second polarity conducting layer;
along the thickness direction of the common pole piece, the area of the first polarity leading-out surface positioned in the middle part is gradually increased or decreased; or along the thickness direction of the common pole piece, the area of the first polarity leading-out surface is gradually increased or decreased;
along the thickness direction of the shared pole piece, the area of the second polarity leading-out surface positioned in the middle part is gradually increased or decreased; or along the thickness direction of the common pole piece, the area of the second polarity derivation surface is gradually increased or decreased;
each first polarity leading-out surface is connected with the first polarity adapter sheet; each second polarity leading-out surface is connected with the second polarity adapter plate;
wherein the first polarity is opposite to the second polarity.
7. The cell of claim 6, wherein a portion of each first polarity lead-out surface that is not in contact with the adjacent insulating support layer is clamped by the first polarity patch; and the parts of all the second polarity leading-out surfaces, which are not in contact with the adjacent insulating support layer, jointly clamp one second polarity adapter sheet.
8. The cell of claim 6, wherein the first and second polarity lead-out faces extend in opposite directions.
9. The electrical core of claim 6, wherein the first polarity patch is snapped or welded to the first polarity lead-out surface.
10. A battery comprising a housing and the cell of any of claims 4-9, wherein the cell is housed within the housing.
CN202110232746.5A 2021-03-02 2021-03-02 Pole piece assembly, battery core and battery Active CN112838259B (en)

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