CN113131055A - Battery cell and electric equipment - Google Patents
Battery cell and electric equipment Download PDFInfo
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- CN113131055A CN113131055A CN202110342251.8A CN202110342251A CN113131055A CN 113131055 A CN113131055 A CN 113131055A CN 202110342251 A CN202110342251 A CN 202110342251A CN 113131055 A CN113131055 A CN 113131055A
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- tab
- pole piece
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
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- 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
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- 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 provides an electric core and consumer, electric core includes electrode assembly, the wrapping bag, interior utmost point ear and outer utmost point ear, the wrapping bag includes main part and edge sealing portion, electrode assembly and interior utmost point ear are all acceptd in the main part, the first end and the electrode assembly of interior utmost point ear, the second end of interior utmost point ear is connected with the one end of outer utmost point ear, edge sealing portion connects in the roof of main part, the other end of outer utmost point ear stretches out outside the wrapping bag from edge sealing portion, in the thickness direction of electric core, the roof is including first part and the second part that is located edge sealing portion both sides, wherein, the first height of first part to the diapire of main part is less than the second height of second part to the diapire of main part. At least one part of the inner pole lug and the joint of the inner pole lug and the outer pole lug are arranged to correspond to the second part, so that the size of the whole battery cell is small, and the space left between the second part and the first part can be used by external electric equipment outside a packaging bag of the battery cell, so that the application range of the battery cell can be expanded.
Description
Technical Field
The embodiment of the application relates to the technical field of batteries, in particular to a battery core and electric equipment.
Background
The battery cell is a device that converts external energy into electric energy and stores the electric energy in the battery cell so as to supply power to external electric equipment (such as portable electronic equipment) at a required time. At present, the battery cell is widely applied to electric equipment such as unmanned aerial vehicles, mobile phones, flat panels, and notebook computers. Generally, the battery cell includes an electrode assembly, a packaging bag, an inner tab and an outer tab, the packaging bag includes a main body portion, the electrode assembly and the inner tab are both accommodated in the main body portion, a first end of the inner tab is connected to the electrode assembly, and a second end of the inner tab is connected to the outer tab.
The applicant of the present application finds in the course of implementing the present application: at present, an electrode assembly is connected with an outer tab through an inner tab, the inner tab and a joint of the inner tab and the outer tab occupy a certain accommodating space, the size of a battery cell is large, the applicability to electric equipment is not high, and therefore the application range of the battery cell is limited.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a battery cell and an electrical device, so as to solve the problem that in the prior art, an inner tab and a joint of the inner tab and an outer tab occupy a certain accommodation space, so that the size of the battery cell is relatively large.
According to an aspect of the embodiment of the application, an electric core is provided, including electrode subassembly, wrapping bag, interior utmost point ear and outer utmost point ear, the wrapping bag includes main part and edge sealing portion, electrode subassembly and interior utmost point ear all accept in the main part, the first end of interior utmost point ear with the electrode subassembly, the second end of interior utmost point ear with the one end of outer utmost point ear is connected, edge sealing portion connect in the roof of main part, the other end of outer utmost point ear is followed edge sealing portion stretches out outside the wrapping bag the thickness direction of electric core, the roof is including being located the first portion and the second part of edge sealing portion both sides, wherein, first portion extremely the first height of the diapire of main part is less than the second portion extremely the second height of the diapire of main part. At least one part of the inner pole lug and the joint of the inner pole lug and the outer pole lug are arranged to correspond to the second part, the whole size of the battery cell is small, and the space left between the second part and the first part outside the packaging bag of the battery cell can be used by external electric equipment, so that the application range of the battery cell can be expanded.
In an optional mode, the outer tab includes a connection portion and an extension portion extending from the connection portion to the outside of the edge sealing portion in a bending manner, the connection portion corresponds to the second portion, the second end of the inner tab extends toward the second portion and is bent toward the first portion at a position close to the second portion, and the second end of the inner tab is connected to the connection portion after being bent. The inner tab is connected with the outer tab through the connecting part of the outer tab, the connecting part corresponds to the second part, and the size of the whole battery cell is small.
In an alternative mode, the electrode assembly comprises a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound together into a winding structure; the inner tabs comprise a plurality of first inner tabs and a plurality of second inner tabs, and the outer tabs comprise first outer tabs and second outer tabs; the first ends of the first inner tabs are connected with a first pole piece, and the second ends of the first inner tabs are connected with a first outer tab; the first end of the second inner tab is connected with the second pole piece, the second end of the second inner tab is connected with the second outer tab, and the second outer tab extends out of the packaging bag from the edge sealing part. Through setting up utmost point ear in a plurality of first and a plurality of second, then the charge-discharge performance of electricity core is good.
In an alternative mode, each circle of the first pole piece is connected with a first end of one first inner pole ear, the connection point of the first pole piece connected with each first inner pole ear is located in the same semicircle of the winding structure, and the connection point of the first pole piece connected with each first inner pole ear corresponds to the second part; and/or each circle of the second pole piece is connected with the first end of the second inner pole ear, the connection point of the second pole piece connected with each second inner pole ear is positioned in the same semicircle of the winding structure, and the connection point of the second pole piece connected with each second inner pole ear corresponds to the second part. In the electrode assembly of the winding structure, the plurality of first inner electrode tabs and the plurality of second inner electrode tabs are arranged in the same semicircle, so that the height difference between the second height corresponding to the second portion and the first height corresponding to the first portion is large, and the space left between the second portion and the first portion outside the packaging bag of the battery cell is large.
In an alternative, the difference between the second height and the first height is 0.6 mm to 1.2 mm.
In an alternative, the difference between the second height and the first height is 0.8 mm to 1.0 mm.
In an alternative form, the difference in height between the second height and the first height is 0.9 mm.
In an optional manner, each half turn of the first pole piece is connected to a first end of the first inner tab, and two connection points of each turn of the first pole piece, which are connected to the first inner tab, are respectively distributed in two semicircles of the winding structure, where one semicircle of the winding structure is opposite to the first portion and the other semicircle of the winding structure is opposite to the second portion; each circle of the second pole piece is connected with a first end of the second inner pole lug, and connection points of the second pole piece and each second inner pole lug are distributed in the same semicircle of the winding structure. In the electrode assembly of the winding structure, even if a plurality of first inner electrode tabs are distributed in two semicircles of the winding structure, since the connecting portions, where the inner electrode tabs are connected with the outer electrode tabs, correspond to the second portions, the first heights corresponding to the first portions are still smaller than the second heights corresponding to the second portions, so that a certain space is still left between the second portions and the first portions outside the packaging bag of the battery cell.
In an optional manner, each circle of the first pole piece is connected to a first end of one of the first inner tabs, and connection points where the first pole piece is connected to each of the first inner tabs are distributed in a same semicircle of the winding structure. Every half circle of second pole piece with one the first end of utmost point ear is connected in the second, every circle of second pole piece with two tie points that utmost point ear is connected distribute respectively in two semicircles of winding structure, wherein, a semicircle of winding structure with first portion is relative, another semicircle of winding structure with the second portion is relative. In the electrode assembly of the winding structure, even if a plurality of second inner tabs are distributed in two semicircles of the winding structure, since the connecting portions, where the inner tabs are connected with the outer tabs, correspond to the second portions, the first heights corresponding to the first portions are still smaller than the second heights corresponding to the second portions, so that a certain space is still left between the second portions and the first portions outside the packaging bag of the battery cell.
In an optional manner, each half turn of the first pole piece is connected to a first end of the first inner tab, and two connection points of each turn of the first pole piece, which are connected to the first inner tab, are respectively distributed in two semicircles of the winding structure; each half circle of the second pole piece is connected with the first end of the second inner pole lug, and two connection points of each circle of the second pole piece, which are connected with the second inner pole lug, are respectively distributed in two semicircles of the winding structure; wherein one semicircle of the winding structure is opposite to the first portion and the other semicircle of the winding structure is opposite to the second portion. In the electrode assembly of the winding structure, even if the first inner electrode tabs are distributed in the two semicircles of the winding structure and the second inner electrode tabs are distributed in the two semicircles of the winding structure, because the connecting portions, connected with the outer electrode tabs, of the inner electrode tabs correspond to the second portions, the first heights corresponding to the first portions are still smaller than the second heights corresponding to the second portions, and therefore a certain space is still left between the second portions and the first portions outside the packaging bag of the battery cell.
In an alternative, the difference between the second height and the first height is 0.2 mm to 0.8 mm.
In an alternative, the difference between the second height and the first height is 0.4 mm to 0.6 mm.
In an alternative form, the difference in height between the second height and the first height is 0.5 mm.
In an optional mode, the device further comprises a plurality of first insulating glues and a plurality of second insulating glues; two ends of the first insulating glue are respectively attached to one surface of the first end of the first inner tab and the surface of the substance layer of the first pole piece; and/or two ends of the second insulating glue are respectively attached to one surface of the first end of the second inner tab and the surface of the material layer of the second pole piece. By arranging the first insulating glue and the second insulating glue, the phenomenon of short circuit between the first pole piece and the second pole piece can be improved.
In an optional mode, the battery further comprises a first lug glue and a second lug glue; the first tab glue is used for sealing the joint of the first outer tab and the edge sealing part, and the second tab glue is used for sealing the joint of the second outer tab and the edge sealing part. Through setting up first utmost point ear glue and second utmost point ear glue, then the electric core is difficult to the junction weeping of outer utmost point ear and wrapping bag.
According to another aspect of the embodiments of the present application, there is provided an electrical device, including a load and any one of the above-mentioned battery cells, wherein the load is electrically connected to the battery cells.
The beneficial effects of this application embodiment are that, a battery core and consumer are provided, the battery core includes electrode subassembly, wrapping bag, interior utmost point ear and outer utmost point ear, the wrapping bag includes main part and edge sealing portion the thickness direction of battery core, the roof of main part is including being located the first portion and the second part of edge sealing portion both sides, wherein, the first portion extremely the first height of the diapire of main part is less than the second portion extremely the second height of the diapire of main part. At least one part of the inner pole lug and the joint of the inner pole lug and the outer pole lug are arranged to correspond to the second part, so that the size of the whole battery cell is small, and the space left between the second part and the first part can be used by external electric equipment outside a packaging bag of the battery cell, so that the application range of the battery cell can be expanded.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a cross-sectional view of a cell provided in an embodiment of the present application in one direction;
fig. 2 is another expression of a cross-sectional view in one direction of a cell provided by an embodiment of the present application;
FIG. 3 is a cross-sectional view of one manner of connecting an electrode assembly and an inner electrode tab in a wound configuration as provided by an embodiment of the present application;
fig. 4 is a further expression of a cross-sectional view in one direction of a cell provided by an embodiment of the present application;
fig. 5 is a further expression of a cross-sectional view in one direction of a cell provided by an embodiment of the present application;
fig. 6 is a further expression of a cross-sectional view in one direction of a cell provided by an embodiment of the present application;
FIG. 7 is a cross-sectional view illustrating still another connection between an electrode assembly and an inner electrode tab in a jelly-roll structure according to an embodiment of the present disclosure;
FIG. 8 is a cross-sectional view of another connection of an electrode assembly and an inner electrode tab in a wound configuration as provided in the examples of the present application;
fig. 9 is a sectional view illustrating still another connection of an electrode assembly and an inner tab in a winding structure according to an embodiment of the present application;
fig. 10 is a sectional view illustrating still another connection of an electrode assembly and an inner tab in a winding structure according to an example of the present application.
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. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present 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 will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
In addition, the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, the battery cell 100 includes an electrode assembly 1, a package bag 2, an inner tab 3 and an outer tab 4, the package bag 2 includes a main body portion 21 and a sealing portion 22, the electrode assembly 1 is accommodated in the main body portion 21, the inner tab 3 is respectively connected to the electrode assembly 1 and the outer tab 4, the sealing portion 22 is connected to a top wall 211 of the main body portion 21, the outer tab 4 extends out of the package bag 2 from the sealing portion 22, in a thickness direction L3 of the battery cell 100, the top wall 211 includes a first portion 2111 and a second portion 2112 located at two sides of the sealing portion 22, wherein a first height h1 from the first portion 2111 to a bottom wall 212 of the main body portion 21 is smaller than a second height h2 from the second portion 2112 to the bottom wall 212 of the. At least the inner tab 3 and the joint of the inner tab 3 and the outer tab 4 are arranged to correspond to the second portion 2112, so that the size of the whole battery cell 100 is small, and the space 2a left between the second portion 2112 and the first portion 2111 outside the packaging bag 2 of the battery cell 100 can be used by external electrical equipment, thereby expanding the application range of the battery cell 100.
Referring to the electrode assembly 1, referring to fig. 3, in some embodiments, the electrode assembly 1 includes a first pole piece 11, a second pole piece 12, and a separator 13, the separator 13 is located between the first pole piece 11 and the second pole piece 12, and the first pole piece 11, the separator 13, and the second pole piece 12 are wound together to form a winding structure.
The first pole piece 11 is a positive pole piece and the second pole piece 12 is a negative pole piece, or the first pole piece 11 is a negative pole piece and the second pole piece 12 is a positive pole piece.
The winding structure has a flat portion 11s and a curved portion 12s, wherein the flat portion 11s is a portion where the first pole piece 11, the separator 13, or the second pole piece 12 extends straight, and the curved portion 12s is a portion where the first pole piece 11, the separator 13, or the second pole piece 12 extends curved toward the flat portion 11 s. In the embodiment of the present application, the direction in which the outer tab 4 protrudes from the sealing portion 22 out of the packaging bag 2 is set as the first direction L1, the direction in which the bending portion 12s bends and extends toward the flat portion 11s is set as the second direction L2, and the directions perpendicular to the first direction L1 and the second direction L2, respectively, are set as the thickness direction L3 of the battery cell 100.
With respect to the electrode assembly 1, in some embodiments, referring to fig. 1, the electrode assembly 1 includes a first pole piece 11, a second pole piece 12 and a separator 13, the separator 13 is located between the first pole piece 11 and the second pole piece 12, and the first pole piece 11, the separator 13 and the second pole piece 12 are sequentially stacked to form a lamination structure.
With the above lamination structure, the direction in which the outer tab 4 extends out of the package bag 2 from the edge seal portion 22 is set to be the first direction L1, and the direction in which the first pole piece 11, the separator 13, and the second pole piece 12 are stacked is set to be the thickness direction L3 of the battery cell 100.
Referring to fig. 1 and 2, the packaging bag 2 includes a main body 21 and a sealing portion 22, wherein the main body 21 has a top wall 211 and a bottom wall 212, and the top wall 211 and the bottom wall 212 are disposed opposite to each other. The hem portion 22 is connected to the top wall 211. The edge sealing part 22 is used for extending the outer tab 4 from the inside of the packaging bag 2 to the outside of the packaging bag 2.
The bead portion 22 includes a first portion 2111 and a second portion 2112. The first portion 2111 and the second portion 2112 are provided on both sides of the seal-off portion 22 in the thickness direction L3 of the battery cell 100. Wherein a first height h1 of the first portion 2111 to the bottom wall 212 of the body portion 21 is less than a second height h2 of the second portion 2112 to the bottom wall 212 of the body portion 21. That is, in the first direction L1, the size of the region where the first portion 2111 is located is smaller than the size of the region where the second portion 2112 is located with respect to the main body portion 21 of the packing bag 2.
In the prior art, the first height h1 is the same as the second height h2, the inner tab 3 is distributed in the first portion 2111 and the second portion 2112, the connection point of the inner tab 3 and the outer tab 4 is located in the region corresponding to the second portion 2112, and the gap between the first portion 2111 and the electrode assembly 1 in the packaging bag 2 is left vacant.
In this embodiment of the application, at least a portion of the inner tab 3, a connection portion of the inner tab 3 and the outer tab 4 may be disposed in an area corresponding to the second portion 2112, and a first height h1 corresponding to the first portion 2111 is smaller than a height corresponding to the second portion 2112, so that the arrangement of the inner tab 3 may be achieved, and the increase of the overall size of the battery cell 100 due to the arrangement of the plurality of inner tabs 3 may not be caused, and outside the packaging bag 2, a space 2a left between the second portion 2112 and the first portion 2111 in the battery cell 100 may be used by an external electrical device.
It should be noted that, in some embodiments, when the number of the inner pole ears 3 is multiple, please refer to fig. 4, a part of the inner pole ears 3 may also be disposed in the region corresponding to the second portion 2112, another part of the inner pole ears 3 may also be disposed in the region corresponding to the first portion 2111, and the connection point of the inner pole ear 3 and the outer pole ear 4 is disposed in the region corresponding to the second portion 2112, so that the arrangement of multiple inner pole ears 3 may also be achieved, but since the first height h1 corresponding to the first portion 2111 of the packaging bag 2 is smaller than the second height h2 corresponding to the second portion 2112, the overall size of the battery cell 100 is small.
It is noted that in some embodiments, the height difference h0 between the second height h2 and the first height h1 is 0.6 mm to 1.2 mm. In some embodiments, the height difference h0 is 0.8 millimeters to 1.0 millimeters. In some embodiments, h0 is preferably 0.9 millimeters.
Alternatively, in other embodiments, the difference in height h0 between the second height h2 and the first height h1 is 0.2 millimeters to 0.8 millimeters. In other embodiments, the height difference h0 is between 0.4 millimeters and 0.6 millimeters. In other embodiments, h0 is preferably 0.5 mm.
Referring to fig. 1 and 2 for the inner tab 3 and the outer tab 4, a first end of the inner tab 3 is connected to the electrode assembly 1, a second end of the inner tab 3 is connected to one end of the outer tab 4, and the other end of the outer tab 4 extends out of the packaging bag 2 from the sealing edge 22 of the packaging bag 2.
It should be noted that in some embodiments, the inner electrode tab 3 is integrally formed with the electrode assembly 1, or the inner electrode tab 3 is welded to the electrode assembly 1.
It should be noted that, in some embodiments, the inner tab 3 and the outer tab 4 are integrally formed, or the inner tab 3 and the outer tab 4 are welded together.
Note that, in some embodiments, the inner tab 3 is integrally formed with the electrode assembly 1, and the inner tab 3 is integrally formed with the outer tab 4.
It should be noted that, in some embodiments, the inner tab 3 is welded to the electrode assembly 1, and the inner tab 3 and the outer tab 4 are welded together.
In some embodiments, the outer tab 4 includes a connecting portion 41 and an extension portion 42, wherein the connecting portion 41 corresponds to the second portion 2112, and the connecting portion 41 is used for connecting with the second end of the inner tab 3. The extension portion 42 is bent and extended from the connection portion 41, and the extension portion 42 extends to the outside of the sealing portion 22. The second end of the outer tab 4 extends towards the second portion 2112 and is bent towards the first portion 2111 close to the second portion 2112. The second end of the inner tab 3 is bent toward the first portion 2111 and then connected to the connection portion 41.
When the number of the inner tabs 3 is plural, the second ends of the plural inner tabs 3 are connected to the connection portions 41 of the outer tabs 4, respectively.
It should be noted that the battery cell 100 generally has two types of inner tabs 3, one type of inner tab 3 and the outer tab 4 connected thereto are positive electrodes of the battery cell 100, and the other type of inner tab 3 and the outer tab 4 connected thereto are negative electrodes of the battery cell 100.
It will be appreciated that in some embodiments, referring to fig. 3, 5 and 6, the inner tab 3 comprises a plurality of first inner tabs 31 and a plurality of second inner tabs 32, and the outer tab 4 comprises a first outer tab 41s and a second outer tab 42 s; first ends of the first inner tabs 31 are connected with the first pole piece 11, and second ends of the first inner tabs 31 are connected with the first outer tab 41 s; first ends of the plurality of second inner tabs 32 are connected to the second pole piece 12, second ends of the plurality of second inner tabs 32 are connected to the second outer tab 42s, and the second outer tab 42s extends out of the package bag 2 from the edge sealing portion 22.
It will be appreciated that in some embodiments, the plurality of first inner tabs 31 are integrally formed with the first pole piece 11, or alternatively, the plurality of first inner tabs 31 are welded to the first pole piece 11.
It will be appreciated that in some embodiments, the second plurality of inner tabs 32 are each integrally formed with the second pole piece 12, or alternatively, the second plurality of inner tabs 32 are each welded to the second pole piece 12.
It is understood that the first and second outer tabs 41s and 42s each have a connection portion 41 and a protruding portion 42. The connecting portion 41 of the first outer tab 41s is adapted to be connected to the second end of the first inner tab 31, and the extension portion 42 of the first outer tab 41s is adapted to extend from the flange portion 22 to the outside of the package bag 2. The connecting portion 41 of the second outer tab 42s is adapted to be connected to the second end of the second inner tab 32, and the extension portion 42 of the second outer tab 42s is adapted to extend from the hem portion 22 to the outside of the package bag 2. The connection portion 41 of the first outer tab 41s corresponds to the second portion 2112, and the connection portion 41 of the second outer tab 42s corresponds to the second portion 2112.
Referring to fig. 3 for the inner tab 3, the outer tab 4 and the electrode assembly 1 in the winding structure, in some embodiments, the inner tab 3, the outer tab 4 and the electrode assembly 1 in the winding structure form a half-tab structure, in which each turn of the first pole piece 11 is connected to a first end of a first inner tab 31, connection points of the first pole piece 11 and each first inner tab 31 are located in the same semicircle of the winding structure, and connection points of the first pole piece 11 and each first inner tab 31 are corresponding to the second portion 2112; and/or each turn of the second pole piece 12 is connected with a first end of a second inner tab 32, the connection point of the second pole piece 12 with each second inner tab 32 is located in the same semicircle of the winding structure, and the connection point of the second pole piece 12 with each second inner tab 32 corresponds to the second portion 2112. Wherein, a connection point where each first inner tab 31 is connected with the first outer tab 41s corresponds to the second portion 2112. Wherein each connection point where the second inner tab 32 and the second outer tab 42s are connected corresponds to the second portion 2112.
Note that, in the half-pole ear structure, a height difference h0 between a second height h2 of the second portion 2112 to the bottom wall 212 of the main body portion 21 and a first height h1 of the first portion 2111 to the bottom wall 212 of the main body portion 21 is 0.6 mm to 1.2 mm.
Preferably, in the semi-polar ear configuration, a height difference h0 between a second height h2 of second portion 2112 to bottom wall 212 of body portion 21 and a first height h1 of first portion 2111 to bottom wall 212 of body portion 21 is 0.8 millimeters to 1.0 millimeters.
More preferably, in the semi-polar ear configuration, the height difference h0 between the second height h2 of the second portion 2112 to the bottom wall 212 of the main body portion 21 and the first height h1 of the first portion 2111 to the bottom wall 212 of the main body portion 21 is 0.9 mm.
Here, the "semicircle" in the embodiment of the present application is a structure obtained by cutting a cross section of the electrode assembly 1 in the winding structure, wherein the cross section is a plane in which the second direction L2 and the thickness direction of the battery cell 100 are located.
Referring to fig. 7, in some embodiments, the inner tab 3, the outer tab 4 and the electrode assembly 1 in the winding structure form a half full tab structure, and one implementation manner of the half full tab structure is that each half turn of the first pole piece 11 is connected to a first end of a first inner tab 31, two connection points where the first pole piece 11 is connected to the first inner tab 31 are respectively distributed in two semicircles of the winding structure, wherein one semicircle of the winding structure is opposite to the first portion 2111, and the other semicircle of the winding structure is corresponding to the second portion 2112; each circle of the second pole piece 12 is connected with a first end of a second inner tab 32, and connection points of the second pole piece 12 and the second inner tab 32 are distributed in the same semicircle of the winding structure. Wherein, a connection point where each first inner tab 31 is connected with the first outer tab 41s corresponds to the second portion 2112. Wherein each connection point where the second inner tab 32 and the second outer tab 42s are connected corresponds to the second portion 2112.
Referring to fig. 8, in some embodiments, the inner tab 3, the outer tab 4 and the electrode assembly 1 in the winding structure form a half full tab structure, and another implementation manner of the half full tab structure is that each turn of the first pole piece 11 is connected to a first end of a first inner tab 31, and connection points of the first pole piece 11 and the first inner tab 31 are distributed in the same semicircle of the winding structure; each half turn of the second pole piece 12 is connected with a first end of a second inner pole tab 32, and two connection points where the second pole piece 12 is connected with the second inner pole tab 32 are respectively distributed in two semicircles of the winding structure, wherein one semicircle of the winding structure is opposite to the first portion 2111, and the other semicircle of the winding structure is corresponding to the second portion 2112. Wherein, a connection point where each first inner tab 31 is connected with the first outer tab 41s corresponds to the second portion 2112. Wherein each connection point where the second inner tab 32 and the second outer tab 42s are connected corresponds to the second portion 2112.
Referring to fig. 9, in some embodiments, the inner tab 3, the outer tab 4 and the electrode assembly 1 in the winding structure form a half full tab structure, and a further implementation manner of the half full tab structure is that each turn of the first pole piece 11 is connected to a first end of a first inner tab 31, and connection points of the first pole piece 11 and the first inner tab 31 are distributed in two semicircles of the winding structure; each circle of the second pole piece 12 is connected with a first end of a second inner tab 32, and connection points of the second pole piece 12 and the second inner tab 32 are distributed in two semicircles of the winding structure. Wherein one half circle of the coiled configuration is opposite the first portion 2111 and the other half circle of the coiled configuration is opposite the second portion 2112. Wherein, a connection point where each first inner tab 31 is connected with the first outer tab 41s corresponds to the second portion 2112. Wherein each connection point where the second inner tab 32 and the second outer tab 42s are connected corresponds to the second portion 2112.
Note that, in the half full tab structure, a height difference h0 between the second height h2 of the second portion 2112 to the bottom wall 212 of the main body portion 21 and the first height h1 of the first portion 2111 to the bottom wall 212 of the main body portion 21 is 0.2 mm to 0.8 mm.
In some embodiments, in the semi-full tab configuration, the height difference h0 between the second height h2 of the second portion 2112 to the bottom wall 212 of the body portion 21 and the first height h1 of the first portion 2111 to the bottom wall 212 of the body portion 21 is 0.4 mm to 0.6 mm.
Preferably, in the semi-full tab structure, a height difference h0 between a second height h2 of the second portion 2112 to the bottom wall 212 of the main body portion 21 and a first height h1 of the first portion 2111 to the bottom wall 212 of the main body portion 21 is 0.5 mm.
It can be understood that, in the half full tab structure, since the connection point of the first inner tab 31 and the first pole piece 11, or the connection point of the second inner tab 32 and the second pole piece 12 are distributed in two semicircles, when the second end of the first inner tab 31 is connected with the first outer tab 41s, or when the second end of the second inner tab 32 is connected with the second outer tab 42s, the accommodation space corresponding to the first portion 2111 in the packaging bag 2 will be occupied, and therefore, in the half full tab structure, the height difference h0 between the second height h2 and the first height h1 is smaller than that in the half tab structure.
Referring to fig. 10, in some embodiments, the inner tab 3, the outer tab 4 and the electrode assembly 1 in the winding structure form a full tab structure, in which each half turn of the first pole piece 11 is connected to a first end of a first inner tab 31, and two connection points of the first pole piece 11 and the first inner tab 31 are respectively distributed in two semicircles of the winding structure; each half circle of the second pole piece 12 is connected with a first end of a second inner pole lug 32, and two connection points of the second pole piece 12 and the second inner pole lug 32 are respectively distributed in two semicircles of the winding structure; wherein one half circle of the coiled configuration is opposite the first portion 2111 and the other half circle of the coiled configuration is opposite the second portion 2112. Wherein, a connection point where each first inner tab 31 is connected with the first outer tab 41s corresponds to the second portion 2112. Wherein each connection point where the second inner tab 32 and the second outer tab 42s are connected corresponds to the second portion 2112.
Note that, in the full tab structure, a height difference h0 between the second height h2 of the second portion 2112 to the bottom wall 212 of the main body portion 21 and the first height h1 of the first portion 2111 to the bottom wall 212 of the main body portion 21 is 0.2 mm to 0.8 mm.
Preferably, in the full tab structure, a height difference h0 between the second height h2 of the second portion 2112 to the bottom wall 212 of the main body portion 21 and the first height h1 of the first portion 2111 to the bottom wall 212 of the main body portion 21 is 0.5 mm.
It should be noted that, for the electrode assembly 1 having the inner tab 3, the outer tab 4 and the winding structure, no matter what structure exists among the inner tab 3, the outer tab 4 and the electrode assembly 1 having the winding structure, that is, no matter how the inner tab 3 is connected with the electrode assembly 1, as long as the second height h2 corresponding to the second portion 2112 of the packaging bag 2 is smaller than the first height h1 corresponding to the first portion 2111, the empty space 2a between the second portion 2112 and the first portion 2111 outside the packaging bag 2 can be used by external electric equipment, thereby expanding the application range of the battery cell 100.
As for the above-mentioned inner tabs 3, in some embodiments, the inner tabs 3 include a plurality of first inner tabs 31 and a plurality of second inner tabs 32, and in order to prevent the first pole piece 11 and the second pole piece 12 from contacting and short-circuiting at the connection point of the first inner tab 31 and the first pole piece 11 or the connection point of the second inner tab 32 and the second pole piece 12, please refer to fig. 5 and 6, the battery cell 100 further includes a plurality of first insulating glues 5 and a plurality of second insulating glues 6. Two ends of a first insulating glue 5 are respectively attached to one surface of the first end of a first inner tab 31 and the surface of the material layer of the first pole piece 11; and/or two ends of a second insulating glue 6 are respectively attached to one surface of the first end of a second inner tab 32 and the surface of the substance layer of the second tab 12.
Wherein, a surface of the first end of the first inner tab 31 and a surface of the material layer of the first pole piece 11 are located on the same side of the first pole piece 11.
Wherein a surface of the first end of the second inner tab 32 and a surface of the substance layer of the second pole piece 12 are located on the same side of the second pole piece 12.
With regard to the above-described outer tab 4, in some embodiments, the outer tab 4 includes a first outer tab 41s and a second outer tab 42s, wherein the first outer tab 41s and the second outer tab 42s both extend out of the package bag 2 from the sealing edge portion 22 of the package bag 2. In some embodiments, referring to fig. 5 and 6, the battery cell 100 further includes a first tab glue 7 and a second tab glue 8, where the first tab glue 7 is used to seal a joint between the first outer tab 41s and the sealing edge portion 22, and the second tab glue 8 is used to seal a joint between the second outer tab 42s and the sealing edge portion 22, so that the electrolyte in the battery cell 100 is not easy to leak from the joint between the first outer tab 41s and the packaging bag 2 or the joint between the second outer tab 42s and the packaging bag 2.
For the inner tab 3 and the outer tab 4, the second end of the inner tab 3 is bent and then connected to the connecting portion 41 of the outer tab 4, in some embodiments, the second end of the inner tab 3 is close to the packaging bag 2, or the connecting portion 41 of the outer tab 4 is close to the packaging bag 2, and in order to insulate the second end of the inner tab 3 or the connecting portion 41 of the outer tab 4 from the packaging bag 2, please refer to fig. 2, a third insulating glue 9 is usually disposed between the second end of the inner tab 3 and the packaging bag 2, or between the connecting portion 41 of the outer tab 4 and the packaging bag 2. When the second end of the inner tab 3 is close to the packaging bag 2, the third insulating glue 9 is respectively adhered to the second end of the inner tab 3 and the packaging bag 2. When the connection portion 41 of the outer tab 4 is brought close to the packaging bag 2, the third insulating paste 9 adheres to the connection portion 41 of the outer tab 4 and the packaging bag 2, respectively.
In the embodiment of the present application, the battery cell 100 includes an electrode assembly 1, a packaging bag 2, an inner tab 3 and an outer tab 4, the packaging bag 2 includes a main body portion 21 and a sealing portion 22, the electrode assembly 1 is accommodated in the main body portion 21, the inner tab 3 is respectively connected to the electrode assembly 1 and the outer tab 4, the sealing portion 22 is connected to a top wall 211 of the main body portion 21, the outer tab 4 extends out of the packaging bag 2 from the sealing portion 22, in a thickness direction L3 of the battery cell 100, the top wall 211 includes a first portion 2111 and a second portion 2112 located at two sides of the sealing portion 22, wherein a first height h1 from the first portion 2111 to a bottom wall 212 of the main body portion 21 is smaller than a second height h2 from the second portion 2112 to the bottom wall. Through setting the first height h1 corresponding to the first part 2111 of the sealing part 22 of the packaging bag 2 to be less than the second height h2 corresponding to the second part 2112 of the sealing part 22, at least a part of the inner tab 3 and the joint of the inner tab 3 and the outer tab 4 can be set to correspond to the second part 2112, the size of the whole battery cell 100 is small, and the empty space 2a between the second part 2112 and the first part 2111 outside the packaging bag 2 of the battery cell 100 can be used by external electric equipment, so that the overall size of the electric equipment is reduced, and the application range of the battery cell 100 is expanded.
The embodiment of the present application further provides an embodiment of an electrical device, where the electrical device includes a load and the battery cell 100 described above. The battery cell 100 is connected to a load, and the battery cell 100 is used to supply power to the load.
The electric equipment can be an energy storage product, a mobile phone, a tablet, an unmanned aerial vehicle, a single wheel or an electric vehicle with more than two wheels, or an electric cleaning tool and the like.
For example, for the above-mentioned unmanned aerial vehicle, a battery pack is mounted on the unmanned aerial vehicle, and the battery pack is used for supplying power to loads including a flight system, a control system, a camera system, and the like on the unmanned aerial vehicle.
It should be noted that the description of the present application and the accompanying drawings set forth preferred embodiments of the present application, however, the present application may be embodied in many different forms and is not limited to the embodiments described in the present application, which are not intended as additional limitations to the present application, but are provided for the purpose of providing a more thorough understanding of the present disclosure. Moreover, the above-mentioned technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope described in the present specification; further, modifications and variations may occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (11)
1. An electric core comprises an electrode component, a packaging bag, an inner tab and an outer tab, wherein the packaging bag comprises a main body part and an edge sealing part, the electrode component and the inner tab are both contained in the main body part, the first end of the inner tab is connected with the electrode component, the second end of the inner tab is connected with one end of the outer tab,
the edge sealing part is connected to the top wall of the main body part, the other end of the outer tab extends out of the packaging bag from the edge sealing part, and the top wall comprises a first part and a second part which are positioned on two sides of the edge sealing part in the thickness direction of the battery cell, wherein the first height from the first part to the bottom wall of the main body part is smaller than the second height from the second part to the bottom wall of the main body part.
2. The cell of claim 1, wherein,
the outer pole lug comprises a connecting portion and an extending portion extending out of the edge sealing portion in a bending mode from the connecting portion, the connecting portion corresponds to the second portion, the second end of the inner pole lug extends towards the second portion and is bent towards the first portion at the position close to the second portion, and the second end of the inner pole lug is connected with the connecting portion after being bent.
3. The cell of claim 2, wherein,
the electrode assembly comprises a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound into a winding structure together;
the inner tabs comprise a plurality of first inner tabs and a plurality of second inner tabs, and the outer tabs comprise first outer tabs and second outer tabs;
the first ends of the first inner tabs are connected with a first pole piece, and the second ends of the first inner tabs are connected with a first outer tab;
the first end of the second inner tab is connected with the second pole piece, the second end of the second inner tab is connected with the second outer tab, and the second outer tab extends out of the packaging bag from the edge sealing part.
4. The cell of claim 3,
each circle of the first pole piece is connected with a first end of a first inner pole lug, the connection point of the first pole piece connected with each first inner pole lug is positioned in the same semicircle of the winding structure, and the connection point of the first pole piece connected with each first inner pole lug corresponds to the second part;
and/or the presence of a gas in the gas,
each circle of the second pole piece is connected with a first end of the second inner pole lug, connecting points of the second pole piece and each second inner pole lug are located in the same semicircle of the winding structure, and the connecting points of the second pole piece and each second inner pole lug correspond to the second part.
5. The cell of claim 4, wherein,
the difference in height between the second height and the first height is 0.6 mm to 1.2 mm.
6. The cell of claim 3,
each half circle of the first pole piece is connected with a first end of a first inner pole lug, and two connection points of each circle of the first pole piece, which are connected with the first inner pole lug, are respectively distributed in two semicircles of the winding structure, wherein one semicircle of the winding structure is opposite to the first part, and the other semicircle of the winding structure is opposite to the second part;
each circle of the second pole piece is connected with a first end of the second inner pole lug, and connection points of the second pole piece and each second inner pole lug are distributed in the same semicircle of the winding structure.
7. The cell of claim 3,
each half circle of the first pole piece is connected with a first end of the first inner pole lug, and two connection points of each circle of the first pole piece, which are connected with the first inner pole lug, are respectively distributed in two semicircles of the winding structure;
each half circle of the second pole piece is connected with the first end of the second inner pole lug, and two connection points of each circle of the second pole piece, which are connected with the second inner pole lug, are respectively distributed in two semicircles of the winding structure;
wherein one semicircle of the winding structure is opposite to the first portion and the other semicircle of the winding structure is opposite to the second portion.
8. The cell of claim 6 or 7, characterized in that,
the difference in height between the second height and the first height is 0.2 mm to 0.8 mm.
9. The cell of any of claims 3 to 7, further comprising a plurality of first insulating glues and a plurality of second insulating glues;
two ends of the first insulating glue are respectively attached to one surface of the first end of the first inner tab and the surface of the substance layer of the first pole piece;
and/or the presence of a gas in the gas,
and two ends of the second insulating glue are respectively attached to one surface of the first end of the second inner tab and the surface of the substance layer of the second pole piece.
10. The electrical core according to any of claims 3 to 7, further comprising a first tab glue and a second tab glue;
the first tab glue is used for sealing the joint of the first outer tab and the edge sealing part, and the second tab glue is used for sealing the joint of the second outer tab and the edge sealing part.
11. An electrical consumer, comprising a load and the cell of any of claims 1-10, wherein the load is electrically connected to the cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110342251.8A CN113131055A (en) | 2021-03-30 | 2021-03-30 | Battery cell and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110342251.8A CN113131055A (en) | 2021-03-30 | 2021-03-30 | Battery cell and electric equipment |
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| CN113131055A true CN113131055A (en) | 2021-07-16 |
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| CN202110342251.8A Pending CN113131055A (en) | 2021-03-30 | 2021-03-30 | Battery cell and electric equipment |
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