CN217933932U - Battery cell structure and battery - Google Patents
Battery cell structure and battery Download PDFInfo
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- CN217933932U CN217933932U CN202221957247.9U CN202221957247U CN217933932U CN 217933932 U CN217933932 U CN 217933932U CN 202221957247 U CN202221957247 U CN 202221957247U CN 217933932 U CN217933932 U CN 217933932U
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 197
- 239000002184 metal Substances 0.000 claims abstract description 197
- 238000003466 welding Methods 0.000 claims abstract description 92
- 238000000576 coating method Methods 0.000 claims abstract description 37
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 239000013543 active substance Substances 0.000 claims abstract description 20
- 239000011149 active material Substances 0.000 claims description 85
- 239000002131 composite material Substances 0.000 claims description 28
- 239000003292 glue Substances 0.000 claims description 6
- 239000011800 void material Substances 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 15
- 230000005611 electricity Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 89
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 13
- 229910001416 lithium ion Inorganic materials 0.000 description 13
- 229920006254 polymer film Polymers 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000007747 plating Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides an electric core structure and battery, electric core structure includes first pole piece, diaphragm and the second pole piece that stacks gradually and convolutes the setting, and the second pole piece is located the outside, and the second pole piece includes compound mass flow body, active substance layer and utmost point ear, and compound mass flow body has relative first metal surface and second metal surface, coats active substance layer on partial first metal surface, covers active substance layer on partial second metal surface to form two-sided coating district, single face coating district and blank area on compound mass flow body; one of the first metal surface and the second metal surface is provided with a first welding part, the lug is welded on the first welding part, and the lug is opposite to the single-face coating area or the blank area. The utility model provides an electricity core structure through setting up the second pole piece in the outside, sets up first metal surface and the second metal surface that a utmost point ear can the lug direct electric connection in the compound mass flow body on the second pole piece, from this, can reduce the thickness of battery.
Description
Technical Field
The utility model relates to a battery technology field especially relates to an electricity core structure and battery.
Background
The lithium ion battery comprises a diaphragm and two pole pieces, wherein the polarity of the two pole pieces is opposite, the diaphragm is positioned between the two pole pieces, and the two pole pieces and the diaphragm are sequentially stacked and wound to form a battery cell structure.
The pole piece includes the mass flow body and active substance layer, and the active substance layer coating is in the both sides of mass flow body. The current collector collects electrons generated by chemical reaction, the tab is welded on the current collector, and the tab conducts the electrons to an external circuit. In order to improve the energy density and safety of the battery, the current collector can be a composite current collector, the composite current collector comprises a polymer film and metal coatings positioned on two sides of the polymer film, the conductivity of the metal coatings on two sides of the polymer film is affected by the insulativity of the polymer film, generally, one tab is welded on each metal coating on two sides of the polymer film, and then the two tabs are electrically connected to realize the conductivity of the metal coatings on two sides of the polymer film.
However, welding tabs to the metal plating layers on both sides of the polymer film increases the thickness of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electricity core structure and battery through with the second pole piece setting in the outside, sets up first metal surface and the second metal surface that an utmost point ear can the lug in the direct current connection complex mass flow body on the second pole piece, from this, can reduce the thickness of battery.
The utility model provides an electric core structure, including the first pole piece, diaphragm and the second pole piece that set up in proper order the range upon range of coiling, the second pole piece is located the outside, and the second pole piece includes compound mass flow body, active substance layer and utmost point ear, and compound mass flow body has relative first metal surface and second metal surface, coats active substance layer on partial first metal surface, covers active substance layer on partial second metal surface to form two-sided coating district, single-sided coating district and blank area on compound mass flow body;
one of the first metal surface and the second metal surface is provided with a first welding part, a lug is welded on the first welding part, the lug is opposite to the single-face coating area or the blank area, and the lug is used for electrically connecting the first metal surface and the second metal surface.
In a possible embodiment, the utility model provides an electric core structure, first weld part are located first metal surface, and first weld part is located single face coating district, and the active material layer includes first active material layer, and first active material layer is located first metal surface, and the distance between first weld part and the first active material layer is less than or equal to half of the length in single face coating district.
In a possible embodiment, the utility model provides an electric core structure, first weld part is located the second metal surface, and first weld part is located the blank, and active material layer includes the second active material layer, and the second active material layer is located the second metal surface.
In a possible embodiment, the utility model provides a cell structure, the distance between first weld part and the second active material layer is less than or equal to half of the length in single face coating district.
In a possible embodiment, the utility model provides an electric core structure, second active material layer include first active material section and second active material section, and first active material section, first weld part and second active material section interval set gradually on the second metal surface.
In a possible embodiment, the present invention provides a battery cell structure, wherein one of the first metal surface and the second metal surface of the second pole piece has a second welding portion, one of the first welding portion and the second welding portion is located on the first metal surface, and the other of the first welding portion and the second welding portion is located on the second metal surface;
the second welding part is opposite to the first welding part, and the pole lug of the second pole piece is welded with the second welding part to be electrically connected with the first metal surface and the second metal surface.
In a possible implementation manner, the utility model provides an electric core structure, the distance between the center of first weld part and the center of second weld part is more than or equal to 0 and is less than or equal to two-thirds the width of utmost point ear.
In a possible implementation, the utility model provides an electricity core structure, the first metal surface and the second metal surface of second pole piece all have the second weld part, and two second weld parts are relative, and two second weld parts welds.
In a possible implementation, the utility model provides an electricity core structure still includes the insulating glue layer, and the insulating glue layer covers on the utmost point ear on the second pole piece one side towards first pole piece.
The utility model also provides a battery, including casing and above-mentioned electric core structure, the electric core structure sets up in the casing.
The utility model provides an electric core structure and battery, electric core structure include the first pole piece, diaphragm and the second pole piece that stack up the setting in proper order and convolute, the second pole piece is located the outside, the second pole piece includes compound mass flow body, active substance layer and utmost point ear, compound mass flow body has relative first metal surface and second metal surface, coats active substance layer on partial first metal surface, covers active substance layer on partial second metal surface to form two-sided coating district, single-sided coating district and blank area on compound mass flow body; one of the first metal surface and the second metal surface has a first welding portion, one surface of the tab is welded with the first welding portion before the cell structure is wound so as to be electrically connected with one of the first metal surface and the second metal surface, and after the cell structure is wound, by disposing the second tab on the outside, the single-side coated area or the blank area on the first metal surface is opposed to the other surface of the tab so as to be electrically connected with the tab; or the blank area on the second metal surface is opposite to the other surface of the tab so as to be electrically connected with the tab; or the first metal surface and the second metal surface are directly electrically connected, so that the first metal surface and the second metal surface can be directly electrically connected through one tab to converge electrons in the first metal surface and the second metal surface together, and compared with the prior art in which two metal surfaces of the composite current collector need to be electrically connected through two tabs, the thickness of the battery can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cell structure provided in an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a cell structure provided in an embodiment of the present invention;
fig. 3 is a schematic view of a first structure of a second pole piece in a cell structure provided in an embodiment of the present invention;
fig. 4 is a schematic diagram of a second structure of a second pole piece in a cell structure provided in the embodiment of the present invention;
fig. 5 is a schematic diagram of a third structure of a second pole piece in a battery cell structure according to an embodiment of the present invention;
FIG. 6 is an enlarged view taken at A in FIG. 1;
FIG. 7 is another enlarged view taken at A in FIG. 1;
fig. 8 is a schematic structural view of a tab in a cell structure provided in an embodiment of the present invention;
fig. 9 is an enlarged view of fig. 2 at B.
Description of reference numerals:
100-cell structure;
110-a first pole piece;
120-a membrane;
130-a second pole piece;
131-a composite current collector; 131 a-double-sided coating zone; 131 b-single-sided coating zone; 131 c-blank area; 1311-a first metal surface; 1312-a second metal surface; 1313 — first weld; 1314-an insulating layer; 1315-second weld;
132-an active material layer; 1321 — a first active material layer; 1322-a second active material layer; 1322 a-a first active material segment; 1322 b-a second active material segment;
133-a tab; 1331-third weld; 1332-a fourth weld;
134-insulating glue layer;
l-single-side coating zone length;
l1-a first pitch;
l2-a second pitch;
l3-third pitch;
w-the width of the tab;
s-a starting end;
e-tail end.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present application, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.
The terms "first," "second," and "third" (if any) in the description and claims of this application and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or maintenance tool that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or maintenance tool.
The lithium ion battery has the advantages of high energy density, long cycle life, small self-discharge, high charging and discharging speed and the like, and is widely applied to the fields of energy storage, consumer electronics, aerospace, travel traffic and the like.
The lithium ion battery comprises a diaphragm and two pole pieces, wherein the polarity of the two pole pieces is opposite, the diaphragm is positioned between the two pole pieces, and the two pole pieces and the diaphragm are sequentially stacked and wound to form a battery cell structure.
The pole piece includes mass flow body and active substance layer, and the active substance layer coating is in the both sides of mass flow body. The charge and discharge process of the lithium ion battery is realized by the insertion and extraction of lithium ions in the active material layer. The current collector collects electrons generated by chemical reaction, the tab is welded on the current collector and is electrically connected with the current collector, and the tab conducts the electrons to an external circuit.
In order to improve the energy density and safety of the battery, a composite current collector can be adopted as the current collector, and the composite current collector comprises a polymer film and metal coatings positioned on two sides of the polymer film. The polymer film layer is made of a polymer material with lighter weight, so that the weight of the composite current collector is reduced by 50% -80% compared with that of a pure metal current collector, and the thickness of the composite current collector is reduced by 25% -40% compared with that of the pure metal current collector, so that more space is reserved in the battery to contain active substances, and the battery adopting the composite current collector has higher energy density. In addition, the composite current collector has no metal burrs generated in heavy impact, and can prevent short circuit between the two pole pieces, so that the battery using the composite current collector also has higher safety.
However, the insulating property of the polymer film affects the conductivity of the metal plating layers on both sides, and generally, tabs are welded to the metal plating layers on both sides of the polymer film, and then the tabs are electrically connected to each other, thereby achieving the conductivity of the metal plating layers on both sides of the polymer film. Specifically, in the first mode, one tab may be welded to each of the metal plating layers on the two sides, and then the two tabs are welded together to electrically connect the metal plating layers on the two sides of the composite current collector. In the second mode, through holes are formed in the composite current collector, and tabs are inserted through the through holes and welded to the current collectors on both sides respectively to electrically connect the metal plating layers on both sides of the composite current collector. The thickness of utmost point ear position department in the battery all can be increased to above two kinds of modes to the second kind mode damages compound mass flow body easily when actual operation, and the operation degree of difficulty is great.
Based on this, the utility model provides an electricity core structure and battery through set up the second pole piece in the outside, sets up first metal surface and second metal surface that a utmost point ear can the direct electric connection in the compound mass flow body on the second pole piece, from this, can reduce the thickness of battery.
The lithium ion battery includes a casing and a cell structure 100, and the cell structure 100 is disposed in the casing. The casing is used for packaging the cell structure 100, and in order to reduce the weight of the lithium ion battery, the casing may be made of aluminum alloy.
Fig. 1 is a schematic structural diagram of a battery cell structure provided by an embodiment of the present invention; fig. 2 is another schematic structural diagram of a cell structure provided in an embodiment of the present invention; fig. 3 is a schematic view of a first structure of a second pole piece in a cell structure provided in an embodiment of the present invention; fig. 4 is a schematic diagram of a second structure of a second pole piece in a cell structure provided in the embodiment of the present invention; fig. 5 is a third schematic structural diagram of the second pole piece in the cell structure provided by the embodiment of the present invention.
Referring to fig. 1 to 5, a cell structure 100 includes a first pole piece 110, a separator 120, and a second pole piece 130, which are sequentially stacked and wound, wherein the second pole piece 130 is located at an outer side, the second pole piece 130 includes a composite current collector 131, an active material layer 132, and a tab 133, the composite current collector 131 has a first metal surface 1311 and a second metal surface 1312 opposite to each other, the active material layer 132 is coated on a portion of the first metal surface 1311, and the active material layer 132 is covered on a portion of the second metal surface 1312, so as to form a double-coated area 131a, a single-coated area 131b, and a blank area 131c on the composite current collector 131; one of the first and second metal surfaces 1311 and 1312 has a first weld 1313 thereon, a tab 133 is welded to the first weld 1313, the tab 133 is opposite to the single-coated region 131b or the blank region 131c, and the tab 133 is used to electrically connect the first and second metal surfaces 1311 and 1312.
With continued reference to fig. 1 and 2, the cell structure 100 is an electrochemical cell including a positive electrode and a negative electrode, and the cell structure 100 is a storage portion of a lithium ion battery. One of the first and second pole pieces 110 and 130 serves as a positive electrode of the cell structure 100, and the other serves as a negative electrode of the cell structure 100. The separator 120 serves as an electronic insulation between the first and second pole pieces 110 and 130, providing a lithium ion migration microporous channel. Electrolyte is further injected into the cell structure 100, and the charge and discharge processes of the lithium ion battery are realized by the insertion and the extraction of lithium ions on the first pole piece 110 and the second pole piece 130 through the electrolyte,
at the winding ending, the first pole piece 110 is located at the inner side, the first pole piece 110 adopts a structure known in the art, the structure of the first pole piece 110 is not described in this embodiment, and the second pole piece 130 is located at the outer side, that is, the second pole piece 130 is used for ending the cell structure 100.
Next, the structure of the second pole piece 130 will be described in detail.
With continued reference to fig. 3 to 5, the second electrode plate 130 includes a current collector, an active material layer 132, and a tab 133, wherein lithium ions can be inserted into and extracted from the active material layer 132, electrons are generated during insertion and extraction of the lithium ions, the current collector is used for collecting the generated electrons, and the tab 133 is used for connecting with an external circuit, and conducting the electrons to the external circuit through the tab 133.
In the present embodiment, the current collector is a composite current collector 131, and the composite current collector 131 includes an insulating layer 1314 and a first metal surface 1311 and a second metal surface 1312 on both sides of the insulating layer 1314. The insulating layer 1314 prevents the first metal surface 1311 and the second metal surface 1312 from communicating, and thus, electrons in the first metal surface 1311 and the second metal surface 1312 cannot converge together. The first metal surface 1311 and the second metal surface 1312 can be connected by one tab 133 in this embodiment, and a process of connecting the first metal surface 1311 and the second metal surface 1312 by one tab 133 will be described below.
With continued reference to fig. 3 to fig. 5, an active material layer 132 is coated on a portion of the first metal surface 1311, and an active material layer 132 is covered on a portion of the second metal surface 1312, where a coverage length of the active material layer 132 on the first metal surface 1311 is different from a coverage length of the active material layer 132 on the second metal surface 1312, so as to form a double-coated area 131a, a single-coated area 131b, and a blank area 131c on the composite current collector 131. The double-coated region 131a is formed by coating the active material layer 132 on both the first metal surface 1311 and the second metal surface 1312, the single-coated region 131b is formed by coating the active material layer 132 on one of the first metal surface 1311 and the second metal surface 1312, and the blank region 131c is formed by not coating the active material layer 132 on both the first metal surface 1311 and the second metal surface 1312. It should be noted that the double-coated region 131a is generally disposed at the beginning S of the winding, and the blank region 131c is generally disposed at the tail end E of the winding for ending the cell structure 100. Wherein, for the sake of clarity, only the double-coated area 131a, the single-coated area 131b and the blank area 131c are identified in fig. 3.
As shown in fig. 3, in a first implementation, an area (the single-sided coating area 131b or the blank area 131 c) of the first metal surface 1311 not coated with the active material layer 132 is disposed near the tail end E, the first welding portion 1313 may be disposed in the area, one side of the tab 133 is welded to the first welding portion 1313, the tab 133 is electrically connected to the first metal surface 1311, after the cell structure 100 is wound, the other side of the tab 133 is opposite to and contacts the area (the blank area 131 c) of the second metal surface 1312 not coated with the active material layer 132, and the other side of the tab 133 is electrically connected to the second metal surface 1312, so that electrons in the first metal surface 1311 and the second metal surface 1312 are gathered together and conducted to an external circuit through the tab 133.
As shown in fig. 4, in a second implementation manner, an area (blank area 131 c) of the second metal surface 1312 not coated with the active material layer 132 is disposed near the tail end E of the composite current collector 131, the first welding portion 1313 is disposed in the area, one surface of the tab 133 is welded to the first welding portion 1313, the tab 133 is electrically connected to the second metal surface 1312, after the cell structure 100 is wound, the other surface of the tab 133 is opposite to and contacts the area (single-surface coated area 131b or blank area 131 c) of the first metal surface 1311 not coated with the active material layer 132, and the other surface of the tab 133 is electrically connected to the first metal surface 1311, so that electrons in the first metal surface 1311 and the second metal surface 1312 are gathered together and conducted to an external circuit through the tab 133.
In addition, as shown in fig. 5, in a third implementation, a blank area 131c is also provided in the middle area of the composite current collector 131, a first welding portion 1313 is provided on the second metal surface 1312 in the blank area 131c, one surface of the tab 133 is welded on the first welding portion 1313, the tab 133 is electrically connected to the second metal surface 1312, after the cell structure 100 is wound, the other surface of the tab 133 is not in contact with the first metal surface 1311, but the second metal surface 1312 near the tail end E of the composite current collector 131 is in contact with the first metal surface 1311, and the first metal surface 1311 and the second metal surface 1312 at the contact position are electrically connected, so that electrons in the first metal surface 1311 and the second metal surface 1312 are gathered together and conducted to an external circuit through the tab 133 electrically connected to the first metal surface 1311.
The embodiment of the utility model provides a battery cell structure 100, including the first pole piece 110, diaphragm 120 and the second pole piece 130 that set up in proper order in the range upon range of winding, second pole piece 130 is located the outside, and second pole piece 130 includes compound mass flow body 131, active substance layer 132 and utmost point ear 133, and compound mass flow body 131 has relative first metal surface 1311 and second metal surface 1312, coats active substance layer 132 on partial first metal surface 1311, covers active substance layer 132 on partial second metal surface 1312 to form two-sided coating district 131a, single side coating district 131b and blank area 131c on compound mass flow body 131; one of the first and second metal surfaces 1311 and 1312 has a first weld 1313 thereon, and one face of the tab 133 is welded to the first weld 1313 before the cell structure 100 is wound so as to be electrically connected to one of the first and second metal surfaces 1311 and 1312, and after the cell structure 100 is wound, by disposing the second tab 130 on the outside, the one-face coated region 131b or the blank region 131c on the first metal surface 1311 is opposite to the other face of the tab 133 so as to be electrically connected to the tab 133; or the blank region 131c on the second metal surface 1312 is opposite to the other side of the tab 133 so as to be electrically connected to the tab 133; or the first metal surface 1311 and the second metal surface 1312 are directly electrically connected; thus, the first metal surface 1311 and the second metal surface 1312 can be directly electrically connected through one tab 133 to converge electrons in the first metal surface 1311 and the second metal surface 1312, and the thickness of the battery can be reduced compared to the prior art in which two metal surfaces of a composite current collector need to be electrically connected through two tabs.
Next, a specific position of the first welded portion 1313 on the first metal surface 1311 in the first embodiment will be described.
As shown in fig. 3, the first welding portion 1313 is located on the first metal surface 1311, the first welding portion 1313 is located in the single-sided coating area 131b, the active material layer 132 includes a first active material layer 1321, the first active material layer 1321 is located on the first metal surface 1311, and a distance between the first welding portion 1313 and the first active material layer 1321 is smaller than or equal to half of a length of the single-sided coating area 131 b.
The active material layer 132 on the first metal surface 1311 is referred to as a first active material layer 1321, the active material layer 132 on the second metal surface 1312 is referred to as a second active material layer 1322, and the length covered by the first active material layer 1321 is set to be shorter than the length covered by the second active material layer 1322. Since the covering length of the first active material layer 1321 is shorter than that of the second active material layer 1322, the first welding portion 1313 may be located on the single-sided coated region 131b and the first welding portion 1313 may be located on the blank region 131c on the first metal surface 1311. The length of the one-side-coated region 131b is referred to as a one-side-coated region length L, and the distance between the first solder 1313 and the first active material layer 1321 is referred to as a first interval L1.
The first welding part 1313 may be disposed in the single-sided coating region 131b such that the first interval L1 is less than or equal to half the length L of the single-sided coating region, and thus the first welding part 1313 may be disposed closer to the first active material layer 1321 and the tab 133 welded to the first welding part 1313 may be disposed closer to the first active material layer 1321, whereby the area of the second metal surface 1312 close to the second active material layer 1322 may be brought into contact with the other side of the tab 133 after the cell structure 100 is wound, and thus, the electrical connection of the first metal surface 1311 and the second metal surface 1312 may be achieved without providing a long blank region 131c at the tail end E.
Next, a specific position of the first welding portion 1313 on the second metal surface 1312 in the second embodiment will be described.
As shown in fig. 4, the first welding portion 1313 is located on the second metal surface 1312, the first welding portion 1313 is located in the blank area 131c, the active material layer 132 includes a second active material layer 1322, and the second active material layer 1322 is located on the second metal surface 1312.
The distance between the first welding part 1313 and the second active material layer 1322 is less than or equal to half the length of the one-side coated region 131 b.
When the first soldering part 1313 is located on the second metal surface 1312, the first soldering part 1313 is located in the blank region 131c because the covering length of the first active material layer 1321 is smaller than that of the second active material layer 1322. The distance between the first welding portion 1313 and the second active material layer 1322 is referred to as a second distance L2, and the second distance L2 is made to be less than or equal to half the length L of the one-side coated region, so that the first welding portion 1313 is positioned closer to the second active material layer 1322, and the tab 133 welded to the first welding portion 1313 is also positioned closer to the second active material layer 1322, whereby the region of the first metal surface 1311 close to the first active material layer 1321 can be brought into contact with the other surface of the tab 133 after the cell structure 100 is wound, and therefore, the first metal surface 1311 and the second metal surface 1312 can be electrically connected without providing a long margin portion 131c at the end E.
Next, a specific position of the first welding portion 1313 on the second metal surface 1312 in the third embodiment will be described.
As shown in fig. 5, the second active material layer 1322 includes a first active material segment 1322a and a second active material segment 1322b, and the first active material segment 1322a, the first welding portion 1313 and the second active material segment 1322b are sequentially disposed on the second metal surface 1312 at intervals.
The second active material layer 1322 may be divided into first and second active material segments 1322a and 1322b that are spaced apart, the first weld 1313 is located between the first and second active material segments 1322a and 1322b, and the tab 133 is welded to the first weld.
As shown in fig. 5, the length of the first active material layer 1321 is smaller than or equal to the length of the first active material segment 1322a, so that a blank region 131c is also formed between the first active material segment 1322a and the second active material segment 1322b, the first welding portion 1313 is disposed in the blank region 131c, and after the cell structure 100 is wound, a region of the second metal surface 1312 near the tail end E is in contact with the first metal surface 1311 opposite to the tab 133, so as to electrically connect the first metal surface 1311 and the second metal surface 1312.
After the cell structure 100 is wound, the first metal surface 1311 or the second metal surface 1312 may be electrically connected to the tab 133 by crimping, or by welding.
FIG. 6 is an enlarged view taken at A in FIG. 1; fig. 7 is another enlarged view of a point a in fig. 1. With continued reference to fig. 3, 4, 6, and 7, one of the first metal surface 1311 and the second metal surface 1312 of the second pole piece 130 has a second welding portion 1315 thereon, one of the first welding portion 1313 and the second welding portion 1315 is located on the first metal surface 1311, and the other of the first welding portion 1313 and the second welding portion 1315 is located on the second metal surface 1312; the second welding part 1315 is partially opposite to the first welding part 1313, and the tab 133 of the second tab 130 is welded to the second welding part 1315 to electrically connect the first metal surface 1311 and the second metal surface 1312.
Fig. 8 is a schematic diagram of a tab in a cell structure provided by the embodiment of the present invention. Referring to fig. 8, the tab 133 includes third and fourth welding portions 1331 and 1332 provided at opposite surfaces of the tab 133.
With continued reference to fig. 3, in a first implementation, the first welding portion 1313 is aligned with the third welding portion 1331 of the tab 133, and the first welding portion 1313 is welded with the third welding portion 1331 of the tab 133. With continued reference to fig. 6, after the cell structure 100 is wound, the second welding portion 1315 is aligned with the fourth welding portion 1332 of the tab 133, and the second welding portion 1315 is welded with the fourth welding portion 1332 of the tab 133. Thereby, the first metal surface 1311 and the second metal surface 1312 are electrically connected through the tab 133.
With continued reference to fig. 4, in a second implementation, first the first welding portion 1313 is aligned with the fourth welding portion 1332 of the tab 133, and the first welding portion 1313 is welded with the fourth welding portion 1332 of the tab 133. With continued reference to fig. 7, after the cell structure 100 is wound, the second welding portion 1315 is aligned with the third welding portion 1331 of the tab 133, and the second welding portion 1315 is welded to the third welding portion 1331 of the tab 133. Thereby, the first metal surface 1311 and the second metal surface 1312 are electrically connected through the tab 133.
In the first and second implementations, the distance between the center of the first weld 1313 and the center of the second weld 1315 is greater than or equal to 0 and less than or equal to two-thirds of the width of the tab 133.
Specifically, as shown in fig. 8, the width of the tab 133 is referred to as a tab width W, the width of the third welding portion 1331 and the width of the fourth welding portion 1332 are both smaller than the tab width W, and the third welding portion 1331 and the fourth welding portion 1332 are arranged in a staggered manner on two opposite surface portions of the tab 133, so that the area of the tab 133 can be effectively utilized, and secondary welding at the same position on the tab 133 can be avoided. A distance between the center of the third welding part 1331 and the center of the fourth welding part 1332 is referred to as a third pitch L3, and the third pitch L3 is greater than or equal to 0 and less than or equal to two-thirds of the tab width W, whereby the first welding part 1313 and the second welding part 1315, which are opposite to the third welding part 1331 and the fourth welding part 1332, respectively, have a distance between their centers that is greater than or equal to 0 and less than or equal to two-thirds of the tab width W.
After the winding of the cell structure 100, the electrical connection between the first metal surface 1311 and the second metal surface 1312 may be achieved by crimping or welding, and the welding is described as an example below.
Fig. 9 is an enlarged view at B in fig. 2. Referring to fig. 9, in a third implementation, each of the first metal surface 1311 and the second metal surface 1312 of the second electrode plate 130 has a second welding portion 1315 thereon, two second welding portions 1315 are opposite to each other, and two second welding portions 1315 are welded; the second pole piece 130 further comprises an insulating glue layer 134, and the insulating glue layer 134 covers a side of the tab 133 of the second pole piece 130 facing the first pole piece 110.
With continued reference to fig. 5, the second welding portion 1315 on the first metal surface 1311 is disposed opposite to the tab 133 on the second metal surface 1312, and the second welding portion 1315 on the second metal surface 1312 is disposed at the blank area 131c of the tail end E of the composite current collector 131. As shown in fig. 9, after the cell structure 100 is wound, the second welding portion 1315 on the second metal surface 1312 is opposite to the second welding portion 1315 on the first metal surface 1311, and then the two second welding portions 1315 are welded, so that the first metal surface 1311 and the second metal surface 1312 can be electrically connected.
Since the tab 133 is electrically connected to the second metal surface 1312, electrons collected on the first metal surface 1311 and the second metal surface 1312 can be extracted through the tab 133.
In the third implementation manner, after the battery cell structure 100 is wound, the tab 133 is disposed toward the first pole piece 110, and in order to prevent the tab 133 from piercing through the separator 120 and contacting with the active material layer on the first pole piece 110, an insulating adhesive layer 134 is further required to be disposed, where the insulating adhesive layer 134 covers one surface of the second pole piece 130, where the tab 133 faces the first pole piece 110.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.
Claims (10)
1. The cell structure is characterized by comprising a first pole piece, a diaphragm and a second pole piece which are sequentially stacked and wound, wherein the second pole piece is positioned on the outer side and comprises a composite current collector, an active substance layer and a tab, the composite current collector is provided with a first metal surface and a second metal surface which are opposite, part of the first metal surface is coated with the active substance layer, and part of the second metal surface is covered with the active substance layer, so that a double-sided coating area, a single-sided coating area and a blank area are formed on the composite current collector;
one of the first metal surface and the second metal surface is provided with a first welding part, the lug is welded on the first welding part, the lug is opposite to the single-face coating area or the blank area, and the lug is used for electrically connecting the first metal surface and the second metal surface.
2. The cell structure of claim 1, wherein the first weld is located on the first metal surface and the first weld is located in the single-sided coating region, the active material layer comprises a first active material layer located on the first metal surface, and a distance between the first weld and the first active material layer is less than or equal to half a length of the single-sided coating region.
3. The cell structure of claim 1, wherein the first weld is located on the second metal surface and the first weld is located in the void region, and the active material layer comprises a second active material layer located on the second metal surface.
4. The cell structure of claim 3, wherein a distance between the first weld and the second active material layer is less than or equal to half a length of the single-sided coating region.
5. The cell structure of claim 3, wherein the second active material layer comprises a first active material segment and a second active material segment, and the first active material segment, the first welding portion and the second active material segment are sequentially arranged on the second metal surface at intervals.
6. The cell structure of claim 2 or 3, wherein one of the first and second metal surfaces of the second pole piece has a second weld thereon, one of the first and second welds being located on the first metal surface, and the other of the first and second welds being located on the second metal surface;
the second welding part is opposite to the first welding part, and the pole lug of the second pole piece is welded with the second welding part so as to be electrically connected with the first metal surface and the second metal surface.
7. The cell structure of claim 6, wherein a distance between a center of the first weld and a center of the second weld is greater than or equal to 0 and less than or equal to two-thirds of a width of the tab.
8. The cell structure of claim 5, wherein the first and second metal surfaces of the second pole piece each have a second weld thereon, the two second welds being opposite and the two second welds being welded.
9. The cell structure of claim 8, further comprising an insulating glue layer covering a surface of the tab of the second pole piece facing the first pole piece.
10. A battery comprising a housing and the cell structure of any of claims 1 to 9, the cell structure being disposed within the housing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221957247.9U CN217933932U (en) | 2022-07-27 | 2022-07-27 | Battery cell structure and battery |
| PCT/CN2023/098401 WO2024021868A1 (en) | 2022-07-27 | 2023-06-05 | Battery core structure and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221957247.9U CN217933932U (en) | 2022-07-27 | 2022-07-27 | Battery cell structure and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217933932U true CN217933932U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221957247.9U Active CN217933932U (en) | 2022-07-27 | 2022-07-27 | Battery cell structure and battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN217933932U (en) |
| WO (1) | WO2024021868A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024021868A1 (en) * | 2022-07-27 | 2024-02-01 | 珠海冠宇电池股份有限公司 | Battery core structure and battery |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216311832U (en) * | 2020-11-30 | 2022-04-15 | 江苏卓高新材料科技有限公司 | Pole piece, secondary battery with pole piece, electronic product and electric vehicle |
| CN113054156B (en) * | 2021-03-11 | 2023-02-28 | 珠海冠宇电池股份有限公司 | Electrode assembly and application thereof |
| CN214848701U (en) * | 2021-03-26 | 2021-11-23 | 厦门海辰新能源科技有限公司 | Pole piece and cylindrical battery roll core structure |
| CN113241423B (en) * | 2021-04-30 | 2023-04-18 | 珠海冠宇电池股份有限公司 | Pole piece and preparation method thereof, and lithium ion battery |
| CN217933932U (en) * | 2022-07-27 | 2022-11-29 | 珠海冠宇电池股份有限公司 | Battery cell structure and battery |
-
2022
- 2022-07-27 CN CN202221957247.9U patent/CN217933932U/en active Active
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2023
- 2023-06-05 WO PCT/CN2023/098401 patent/WO2024021868A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024021868A1 (en) * | 2022-07-27 | 2024-02-01 | 珠海冠宇电池股份有限公司 | Battery core structure and battery |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024021868A1 (en) | 2024-02-01 |
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