CN116666775B - Lithium ion battery, electrochemical device, and electronic apparatus - Google Patents
Lithium ion battery, electrochemical device, and electronic apparatus Download PDFInfo
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- CN116666775B CN116666775B CN202310931524.1A CN202310931524A CN116666775B CN 116666775 B CN116666775 B CN 116666775B CN 202310931524 A CN202310931524 A CN 202310931524A CN 116666775 B CN116666775 B CN 116666775B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 33
- 239000011888 foil Substances 0.000 claims abstract description 30
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 238000005452 bending Methods 0.000 claims description 60
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 238000005187 foaming Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 description 9
- 239000006183 anode active material Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 239000006182 cathode active material Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000006256 anode slurry Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 239000006257 cathode slurry Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000006245 Carbon black Super-P Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 1
- -1 Polyethylene Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Primary Cells (AREA)
Abstract
The application discloses a lithium ion battery, an electrochemical device and an electronic device, wherein the lithium ion battery comprises: the winding type battery cell comprises a cathode pole piece, an anode pole piece and an isolating film, wherein the isolating film is arranged between the cathode pole piece and the anode pole piece, the cathode pole piece, the anode pole piece and the isolating film are wound to form the winding type battery cell, the innermost ring of the winding type battery cell is the cathode pole piece, the innermost ring of the cathode pole piece is a single-sided cathode pole piece, a cathode coating is arranged on one side of the single-sided cathode pole piece, the side of the single-sided cathode pole piece, which is not provided with the cathode coating, is an empty foil surface, which faces towards the inner side of the winding type battery cell, and a first tab is arranged on the innermost ring of the cathode pole piece. According to the application, the single-sided cathode of the winding core is arranged at the innermost ring, so that compared with the single-sided anode which is internally arranged at the innermost ring, one piece of foaming adhesive paper and one piece of protective adhesive paper can be reduced, and the manufacturing cost of the battery core is reduced.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a lithium ion battery, an electrochemical device, and an electronic apparatus.
Background
The lithium ion battery is widely applied to electronic products in various fields due to the advantages of long service life, high energy density and the like, at present, when the coiled lithium ion battery is manufactured, a single-sided anode is usually adopted to be positioned at the innermost ring, a cathode lug is positioned at an N layer (N is more than or equal to 2), two foaming gummed papers are adhered to corresponding positions on two sides of an aluminum foil in the cathode preparation process, so that an aluminum lug welding area is constructed, and the anode area opposite to the aluminum lug is also required to be adhered with the two protection gummed papers to play a role of double protection.
Disclosure of Invention
In view of the above, the present application provides a lithium ion battery, an electrochemical device and an electronic apparatus, so as to solve the above technical problems and reduce the manufacturing cost of the battery cell.
In a first aspect, the application provides a lithium ion battery, which comprises a winding type battery cell, wherein the winding type battery cell comprises a cathode pole piece, an anode pole piece and an isolating film, the isolating film is arranged between the cathode pole piece and the anode pole piece, the cathode pole piece, the anode pole piece and the isolating film are wound to form the winding type battery cell, the cathode pole piece and the anode pole piece are wound for a plurality of circles, the innermost ring of the winding type battery cell is the cathode pole piece, the innermost ring of the cathode pole piece is a single-sided cathode pole piece, a cathode coating is arranged on one side, the hollow foil of the innermost ring of the cathode pole piece faces towards the inner side of the winding type battery cell, and a first tab is arranged on the innermost ring of the cathode pole piece. According to the application, the innermost ring of the winding type battery cell is set as the single-sided cathode pole piece, the cathode coating is coated on one side, and only one piece of foam adhesive paper is needed to be arranged on one side of the coating in the cathode preparation process, so that a tab welding area is constructed, and the tab welding area is used for welding the first tab.
In some embodiments, at least part of the outermost ring of the cathode pole piece is a single-sided cathode pole piece, the empty foil surface of the outermost ring of the cathode pole piece faces to the outer side of the winding type battery cell, the winding end of the outermost ring of the cathode pole piece is an empty foil section, and a second lug is arranged on the empty foil section. By arranging the second lug on the empty foil section at the winding tail end of the outermost ring of the winding type battery cell, on one hand, the current density of the battery cell can be improved, the rate capability of the battery is improved, and on the other hand, the safety performance of the battery cell can be improved.
In some embodiments, the cathode pole piece innermost ring includes a first starting section, a first bending section, a first middle section and a second bending section, the end of the first starting section is connected with the head end of the first bending section, the end of the first bending section is connected with the head end of the first middle section, the end of the first middle section is connected with the head end of the second bending section, and the first tab is arranged on the first starting section and/or the first middle section.
In particular, in some examples, the first tab is disposed on the first starting segment, in other examples, the first tab is disposed on the first intermediate segment, and in other examples, the first tab is disposed on the first starting segment and the first intermediate segment, respectively.
In some embodiments, the first tab includes a first end adjacent to the first bending section, and a distance between the first bending section vertex and the second bending section vertex is denoted as a, and a distance between the first end and the first bending section vertex is denoted as a, that is, a projection distance of the first end and the first bending section vertex on a horizontal line is denoted as a, so that: the thickness of the wound battery core is greater than or equal to 0.3 and less than or equal to 0.8, the first direction is the length direction of the wound battery core, the second direction is the thickness direction of the wound battery core, and the first direction is perpendicular to the second direction.
Illustratively, a/A is 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or a/A size is within a range of any two of the values recited above.
In some embodiments, the outermost ring of the cathode pole piece includes a third bending section, a second middle section and a fourth bending section, the end of the third bending section is connected with the head end of the second middle section, the end of the second middle section is connected with the head end of the fourth bending section, the end of the fourth bending section is connected with the empty foil section, the second lug includes a second end adjacent to the fourth bending section, the distance between the vertex of the third bending section and the vertex of the fourth bending section is denoted as B along the first direction, the distance between the vertex of the second end and the vertex of the fourth bending section is denoted as B, that is, the projection distance between the vertex of the second end and the vertex of the fourth bending section on the horizontal line is denoted as B, so as to satisfy the following conditions: B/B is more than or equal to 0.2 and less than or equal to 0.8.
Illustratively, B/B is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or B/B size is within a range of any two of the values recited above.
In some embodiments, at least one of the following conditions is satisfied: (1) a/A is more than or equal to 0.5 and less than or equal to 0.8; (2) B/B is more than or equal to 0.2 and less than or equal to 0.5. When the conditions are met, the current density of the battery core can be further improved, and the rate performance of the battery, especially the cycle performance under high rate, is more facilitated to be improved.
Illustratively, a/A is 0.5, 0.6, 0.7, 0.8, or a/A size is within a range of any two of the values set forth above.
Illustratively, B/B is 0.2, 0.3, 0.4, 0.5, or B/B is in a range of any two values recited above.
In some embodiments, the projections of the first tab and the second tab at least partially overlap in the second direction. Preferably, along the second direction, the projections of the first tab and the second tab in the second direction are completely overlapped, and at this time, the cycle performance at high magnification is the best.
In some embodiments, the anode pole piece is provided with an anode tab, and in the unfolded state of the anode pole piece, the anode tab is arranged in the middle of the anode pole piece, wherein the middle refers to the central position of the anode pole piece along the length direction after being unfolded.
In a second aspect, the present application provides an electrochemical device comprising a lithium ion battery as described above.
In a third aspect, the present application provides an electronic device comprising a lithium ion battery as described above, or an electrochemical apparatus as described above.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an embodiment of a coiled electrical cell according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another embodiment of a coiled battery cell according to an embodiment of the present application.
In the figure: 1. a coiled electrical core; 11. a cathode pole piece; 111. a first tab; 112. a second lug; 12. an anode pole piece; 121. an anode tab; 13. a separation film; 101. a first start section; 102. a first bending section; 103. a first intermediate section; 104. a second bending section; 201. a third bending section; 202. a second intermediate section; 203. a fourth bending section; 204. an empty foil section.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Winding type battery cell
Example 1
Referring to fig. 1 in combination with fig. 2, the wound battery core 1 includes a cathode pole piece 11, an anode pole piece 12, and a separator 13, the separator 13 is disposed between the cathode pole piece 11 and the anode pole piece 12, the cathode pole piece 11, the anode pole piece 12, and the separator 13 are wound to form the wound battery core 1, the cathode pole piece 11 and the anode pole piece 12 are wound for multiple turns, an innermost ring of the wound battery core 1 is a single-sided cathode, a cathode coating is disposed on a single side, an empty foil surface of the cathode pole piece is toward an inner side of the wound battery core 1, a first tab 111 is disposed on the innermost ring of the cathode pole piece, at least a portion of an outermost ring of the cathode pole piece is a single-sided cathode pole piece, an empty foil surface of the outermost ring of the cathode pole piece is toward an outer side of the wound battery core 1, a winding end of the outermost ring of the cathode pole piece is an empty foil segment 204, a second tab 112 is disposed on the empty foil segment 204, an anode tab 121 is disposed on the anode pole piece 12 in an expanded state of the anode pole piece 12, and the anode tab 121 is disposed in the middle of the anode tab 12.
According to the application, the innermost ring of the winding type battery cell is set as the single-sided cathode pole piece, and only one piece of foaming adhesive paper is required to be arranged at one side of the coating in the cathode preparation process, so that compared with the prior art, one piece of foaming adhesive paper and one piece of protection adhesive paper corresponding to the foaming adhesive paper are reduced, and the cost of the battery cell is reduced.
The cathode sheet 11 includes a cathode current collector and a cathode active material layer disposed on the cathode current collector, the present application is not particularly limited, and may include an aluminum foil, an aluminum alloy foil, a composite current collector (e.g., a composite current collector having a metal layer disposed on a surface of a polymer layer), etc., and the present application is also not particularly limited in terms of the thickness of the cathode current collector, for example, the thickness of the cathode current collector is 5 μm to 12 μm. The thickness of the cathode active material layer is not particularly limited in the present application, and for example, the thickness of the cathode active material layer is 30 μm to 120 μm. It should be noted that, the blank foil section 204 in the present application is a cathode current collector, the single-sided cathode is coated with a cathode active material layer only on one side surface of the cathode current collector, and other positions (except for the innermost ring of the cathode pole piece and the outermost ring of the cathode pole piece) which are not specifically described are coated on both sides, i.e. the two side surfaces of the cathode current collector are coated with the cathode active material layer.
The anode tab 12 includes an anode current collector and an anode active material layer disposed on the anode current collector, and the present application is not particularly limited, and may include copper foil, copper alloy foil, nickel foil, stainless steel foil, titanium foil, foam nickel, foam copper, or a composite current collector (e.g., a composite current collector having a metal layer disposed on a surface of a polymer layer), or the like. The thickness of the anode current collector is also not particularly limited in the present application, and for example, the thickness of the anode current collector is 5 μm to 12 μm. The thickness of the anode active material layer is not particularly limited in the present application, and for example, the thickness of the anode active material layer is 30 μm to 120 μm. The anode sheet 12 in the present application is coated on both sides, i.e., anode active material layers are coated on both side surfaces of the anode current collector. With continued reference to fig. 1, the innermost ring of the cathode pole piece includes a first starting section 101, a first bending section 102, a first middle section 103 and a second bending section 104, the end of the first starting section 101 is connected with the head end of the first bending section 102, the end of the first bending section 102 is connected with the head end of the first middle section 103, the end of the first middle section 103 is connected with the head end of the second bending section 104, and the first tab 111 is disposed on the first starting section 101. The outermost ring of the cathode pole piece comprises a third bending section 201, a second middle section 202 and a fourth bending section 203, the tail end of the third bending section 201 is connected with the head end of the second middle section 202, the tail end of the second middle section 202 is connected with the head end of the fourth bending section 203, the tail end of the fourth bending section 203 is connected with the empty foil section 204, and the second lug 112 is arranged on the empty foil section 204.
With continued reference to fig. 2, the first tab 111 includes a first end adjacent to the first bending section 102. Along a first direction (direction shown by X), a distance between the vertex of the first bending section 102 and the vertex of the second bending section 104 is denoted as a, and a distance between the first end and the vertex of the first bending section is denoted as a, so that: a/A is more than or equal to 0.3 and less than or equal to 0.8. Preferably, 0.5.ltoreq.a/A.ltoreq.0.8.
The second lug 112 includes a second end adjacent to the fourth bending section, and the distance between the vertex of the third bending section and the vertex of the fourth bending section is denoted as B, and the distance between the second end and the vertex of the fourth bending section is denoted as B, and B/B is 0.2-0.8. Preferably, 0.2.ltoreq.b/B.ltoreq.0.5.
In the embodiment of the present application, the projections of the first tab and the second tab in the second direction (the direction indicated by Y) are completely overlapped, and in other embodiments of the present application, the projections of the first tab and the second tab in the second direction may be partially overlapped or not overlapped, so long as the above range is satisfied, and the present application is not limited.
Other embodiments
Unlike the first embodiment, the cathode tab 11 of the coiled electrical core 1 is provided with only the first tab 111, and the hollow foil section of the outermost ring is not provided with the second tab 112, and the anode tab 121 is provided in the same manner as the first embodiment, see fig. 2 in particular; or,
unlike the first embodiment, a first tab 111 is provided on the first intermediate section 103, otherwise the same as the first embodiment; or,
unlike the first embodiment, the number of the first tabs 111 is two, and the two first tabs 111 are respectively disposed on the first starting section 101 and the first intermediate section 103, otherwise the same as the first embodiment.
Electrochemical device
The electrochemical device comprises the winding type battery cell. The electrochemical device of the present application may include any device in which an electrochemical reaction occurs, and specific examples thereof include all kinds of primary or secondary batteries. In particular, the electrochemical device is a lithium secondary battery, including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery.
Electronic equipment
The electronic device according to the present application includes any one of the above electrochemical devices. The electronic equipment of the application comprises, but is not limited to, mobile phones, notebook computers, tablet computers, game machines, unmanned aerial vehicles, electric bicycles, electric tools, bluetooth headsets, smart watches, smart bracelets and the like.
Hereinafter, embodiments of the present application will be described in more detail with reference to examples and comparative examples.
Taking a lithium ion battery with a winding type battery core as an example, adopting a single-sided cathode to be positioned at the innermost ring, and carrying out a verification test of bipolar lug extraction.
The pole piece assembled battery of the application can be designed according to practical requirements by a person skilled in the art, the design of the lithium ion battery is not limited by the application, and a possible mode is described below.
Preparation of lithium ion battery
The lithium ion batteries in the examples and comparative examples were each prepared as follows:
(1) Preparation of cathode pole piece
Lithium nickel cobalt manganese oxide LiNi as cathode active material 0.8 Co 0.1 Mn 0.1 O 2 Binder polyvinylidene fluoride (PVDF) and conductive agent Super-P according to the mass ratio of 96:2:2 are dissolved in N-methyl pyrrolidone (NMP) and are uniformly mixed to prepare cathode slurry. The cathode slurry was uniformly coated on a current collector aluminum foil having a thickness of 12 μm, and dried at 120 deg.cAnd obtaining the cathode plate with one side coated with the cathode active material layer. And repeating the steps on at least part of the surface of the other surface of the aluminum foil, and compacting and cutting to obtain the cathode pole piece. The coating weight of the double-sided cathode is 371.6mg/1540.25mm 2 A compacted density of 4.1g/cm 3 。
(2) Preparation of anode pole piece
Anode active material, thickener sodium carboxymethyl cellulose (CMC) and binder styrene-butadiene rubber are mixed according to the mass ratio of 96:2:2, dissolving the mixture in water, and fully stirring and uniformly mixing to obtain anode slurry, wherein the anode active material is obtained by mixing graphite and silicon-based material SiO according to a mass ratio of 40:60, and the average grain diameter of the silicon-based material is 7 mu m. The anode slurry was uniformly coated on a current collector copper foil having a thickness of 12 μm, and dried at 120 deg.c to obtain an anode sheet having one side coated with an anode active material layer. And repeating the steps on the other surface of the copper foil to obtain an anode plate with the anode active material layer coated on both sides, and compacting and cutting to obtain the anode plate.
(3) Preparation of a separator film
A Polyethylene (PE) porous film 9 μm thick was selected as the separator.
(4) Preparation of electrolyte
Uniformly mixing Ethylene Carbonate (EC), ethylmethyl carbonate (EMC) and diethyl carbonate (DEC) according to the mass ratio of 1:1:1 to obtain the organic solvent. LiPF is put into 6 Dissolving in the organic solvent, adding vinylene carbonate, and mixing to obtain electrolyte. Wherein based on the total mass of the electrolyte, the LiPF 6 The mass percentage of the ethylene carbonate is 12.5 percent, and the mass percentage of the vinylene carbonate is 3 percent.
(5) Preparation of lithium ion soft package battery
The cathode pole piece, the isolating film and the anode pole piece are sequentially laminated, the isolating film is used for isolating the cathode pole piece and the anode pole piece, the winding innermost ring is guaranteed to be a single-sided cathode during winding, the winding outermost ring is also guaranteed to be a single-sided cathode, the winding tail end of the outermost ring is an empty foil section, the first pole lug is welded on the innermost ring of the cathode pole piece, the second pole lug is welded on the empty foil section to form a bare cell, the bare cell is placed in an aluminum plastic film of a shell to be sealed, and the lithium ion battery of the embodiment 1-4 is obtained after the procedures of high-temperature baking, electrolyte injection, vacuum packaging, standing, formation, shaping, capacity testing and the like, and parameter parts and tests of the embodiment 1-4 are shown in the table 1. The thickness of the soft package battery is 4.6mm, the width is 52mm, and the length is 74mm.
In example 5, the difference from example 1 is that example 5 only provides the first tab, and the second tab is not provided in the empty foil section, and the parameter part and the test result of example 5 are also shown in table 1.
(II) test method
Multiplying power test: the lithium ion battery was left at 25 ℃ for 30min, then charged to 4.48V at a rate of 0.2C, charged to 0.05C at a constant voltage of 4.48V, left at rest for 10min, and finally discharged to 3V at different rates, capacities of 0.2C, 0.5C, 1C, 2C, 3C, 3.5C, 4C rate discharge were tested, respectively, and capacity retention = discharge capacity at different rates/0.2C rate discharge capacity x 100%.
TABLE 1
Compared with the embodiment 1, the embodiment 5 can be seen that the second tab is further arranged on the empty foil section at the winding tail end of the outermost ring of the winding type battery cell, and the first tab and the second tab are cooperatively matched, so that the current density is improved, the lithium precipitation window is widened, and the rate capability of the battery is improved. Compared with embodiments 1 to 4, it can be seen that the cycle performance of the battery under high multiplying power can be better improved by further adjusting the setting positions of the first tab and the second tab.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (8)
1. The lithium ion battery is characterized by comprising a winding type battery cell, wherein the winding type battery cell comprises a cathode pole piece, an anode pole piece and an isolating film, the isolating film is arranged between the cathode pole piece and the anode pole piece, the cathode pole piece, the anode pole piece and the isolating film are wound to form the winding type battery cell, and the innermost ring of the winding type battery cell is the cathode pole piece;
the cathode coating of the single-sided cathode pole piece is provided with a groove, a first tab is embedded in the groove, the winding tail end of the outermost ring of the cathode pole piece is an empty foil section, and a second tab is arranged on the empty foil section;
the cathode pole piece innermost ring comprises a first starting section, a first bending section, a first middle section and a second bending section, the cathode pole piece outermost ring comprises a third bending section, a second middle section and a fourth bending section, the first pole lug comprises a first end adjacent to the first bending section, and the second pole lug comprises a second end adjacent to the fourth bending section;
in the first direction, the distance between the vertex of the first bending section and the vertex of the second bending section is denoted as A, the distance between the first end and the vertex of the first bending section is denoted as a, the distance between the vertex of the third bending section and the vertex of the fourth bending section is denoted as B, and the distance between the second end and the vertex of the fourth bending section is denoted as B; at least one of the following conditions is satisfied:
（1）0.5≤a/A≤0.8；
（2）0.2≤b/B≤0.5；
the first direction is the length direction of the coiled battery cell.
2. The lithium-ion battery of claim 1, wherein the battery comprises a plurality of lithium-ion batteries,
at least part of the outermost ring of the cathode pole piece is a single-sided cathode pole piece;
and the outermost ring of the cathode pole piece is faced to the outer side of the winding type battery cell.
3. The lithium-ion battery of claim 1, wherein the battery comprises a plurality of lithium-ion batteries,
the tail end of the first starting section is connected with the head end of the first bending section, the tail end of the first bending section is connected with the head end of the first middle section, and the tail end of the first middle section is connected with the head end of the second bending section;
the first tab is arranged on the first initial section and/or the first middle section.
4. The lithium ion battery of claim 1, wherein the third bending section end is connected to the second intermediate section head end, the second intermediate section end is connected to the fourth bending section head end, and the fourth bending section end is connected to the hollow foil section.
5. The lithium-ion battery of claim 1, wherein the projections of the first tab and the second tab at least partially overlap in a second direction;
the second direction is the thickness direction of the winding type battery cell;
the first direction is perpendicular to the second direction.
6. The lithium ion battery of claim 1, wherein the anode tab is provided with an anode tab;
in the unfolding state of the anode pole piece, the anode tab is arranged in the middle of the anode pole piece.
7. An electrochemical device comprising the lithium ion battery according to any one of claims 1 to 6.
8. An electronic device comprising a lithium-ion battery as defined in any one of claims 1 to 6; or,
the electronic device comprising the electrochemical apparatus of claim 7.
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