WO2023020568A1 - 电极组件、电池和用电设备 - Google Patents
电极组件、电池和用电设备 Download PDFInfo
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- WO2023020568A1 WO2023020568A1 PCT/CN2022/113229 CN2022113229W WO2023020568A1 WO 2023020568 A1 WO2023020568 A1 WO 2023020568A1 CN 2022113229 W CN2022113229 W CN 2022113229W WO 2023020568 A1 WO2023020568 A1 WO 2023020568A1
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- WIPO (PCT)
- Prior art keywords
- tab
- electrode assembly
- pole piece
- groove
- current collector
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- 239000011149 active material Substances 0.000 claims abstract description 62
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 238000004804 winding Methods 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 48
- 230000009286 beneficial effect Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011888 foil Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000007755 gap coating Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
-
- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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
Definitions
- the invention relates to the technical field of electrochemical devices, in particular to an electrode assembly, a battery with the electrode assembly and electrical equipment.
- An embodiment of the present application provides an electrode assembly, including a first pole piece, a second pole piece and a separator, the first pole piece is provided with a first tab, and the second pole piece is provided with a second tab, The separator is disposed between the first pole piece and the second pole piece, and the first pole piece, the separator and the second pole piece are wound to form the electrode assembly.
- the electrode assembly further includes a third tab, and the third tab is disposed on the first pole piece.
- the first pole piece includes a first current collector and a first active material layer, and the first active material layer is arranged on the surface of the first current collector to form a first coating area; along the first direction, the The first active material layer is extended in a strip shape; the first tab and the third tab are spaced apart from each other in the first coating area.
- the first tab and the third tab divide the first coating area into a first part, a second part and a third part, the first part,
- the length ratio of the second part and the third part is: 1:(0.5-1.5):(0.5-1.5), preferably 1:(0.8-1.2):(0.8-1.2).
- the first direction is the length direction of the pole piece in the unfolded state, and is also the winding direction of the electrode assembly.
- the above-mentioned electrode assembly divides the current by adding the third tab on the first pole piece, and the first tab and the third tab divide the first coating area according to a predetermined ratio, thereby reducing the distance between adjacent tabs.
- the difference in resistance between them can give full play to the advantages of charging speed and temperature rise reduction, so as to achieve the purpose of improving the overcurrent capacity of the electrode assembly and reducing the temperature rise of the electrode assembly.
- the first active material layer is provided with a first groove and a third groove at intervals, the first tab is disposed in the first groove, and the third tab is disposed in the In the third groove, along the first direction, the length of the first active material layer is L, and the distance between the first groove and the third groove is H, where
- the first groove and the third groove are formed by missing the first active material layer.
- the absence of the above-mentioned active material layer may expose the current collector, or expose other coatings coated on the surface of the current collector.
- the first groove runs through the first active material layer, and the first groove can be formed on the first pole piece by gap coating, which reduces the difficulty of manufacturing the pole piece.
- the second direction is perpendicular to the first direction. In the unfolded state of the pole piece, the second direction refers to the width direction of the pole piece, which can also be said to be the length direction of the electrode assembly in the wound state.
- the first edge of the first groove is flush with the first side of the first collector, and the second edge of the first groove is flush with the first side of the first collector.
- the second sides of the fluid are arranged at intervals, which is beneficial to reduce the loss of the active material layer and maintain the energy density of the cell assembly.
- the side of the first tab is spaced apart from the side of the first groove, so as to reduce the problem of the tab contacting the active material.
- the distance between the side of the first lug and the side of the first slot is 2-2.5 mm, so as to install the first tab within the tolerance limit of the device.
- One lug and reduce the problem of tab contact with active substances.
- the width of the first tab is 6-8mm, and the width of the first groove is 10-13mm, so as to reduce the energy of the battery cell caused by excessive loss of active material The effect of density.
- the first tab includes a first section and a second section, the first section is disposed in the first groove and connected to the first current collector, and the first section The second section is bent toward the side of the first current collector away from the first section, so that the bent lug exerts pressure on the pole piece, which is conducive to strengthening the connection relationship between the pole lug and the pole piece , to reduce the problem that the pole lug is separated from the pole piece due to external force.
- the first current collector includes a first side and a second side oppositely disposed, the first tab protrudes from the first side, and the first tab protrudes from the first side.
- the three tabs protrude from the second side, so that after the electrode assembly is wound and formed, the first tab and the third tab are respectively located at opposite ends of the electrode assembly, and the gap between the first tab and the third tab is The distance between them in the first direction can be shortened, which facilitates the development of miniaturized batteries.
- the first tab and the third tab are formed by part of the side surface of the first current collector beyond the first current collector, specifically, the first tab and the third tab
- the ear can be formed by cutting the first current collector, so that the coverage area of the first active material layer can be reserved to the maximum, which is beneficial to improve the energy density of the electrode assembly.
- the second pole piece includes a second current collector and a second active material layer, and the second active material layer is disposed on the surface of the second current collector to form a second coating area, so The second tab is located in the second coating area.
- the second tab divides the second coating area into a fourth part and a fifth part, and along the winding direction of the second pole piece, the fourth part and the first
- the length ratio of the five parts is: 1:(0.5-1.5), preferably 1:(0.8-1.2), which is beneficial to reduce the difference in internal resistance between adjacent tabs.
- the electrode assembly further includes a fourth tab, the fourth tab is disposed in the second coating area, and the fourth tab is spaced apart from the second tab, The second tab and the fourth tab divide the second coating area into a fourth part, a fifth part and a sixth part.
- the fourth The length ratio of the part, the fifth part and the sixth part is: 1:(0.5-1.5):(0.5-1.5), preferably 1:(0.8-1.2):(0.8-1.2). In this way, the current can be further shunted to reduce the temperature rise of the electrode assembly.
- the third direction is the thickness direction of the electrode assembly, and the staggered arrangement of multiple tabs can reduce the problem of uneven thickness of the electrode assembly caused by the stacking of the tab thickness, which is beneficial to improve the electrode assembly in multiple times. The problem of deformation during charging and discharging.
- At least two layers of the first pole piece or the second pole piece are separated between adjacent tabs, preferably four layers of pole pieces are separated, which is beneficial to avoid single-layer There are many glues on the pole piece, which leads to the inconsistent interface of the pole piece and the circulation interface problem.
- the first pole piece is a cathode piece and the second pole piece is an anode piece.
- the opposite sides of the current collector at the winding starting end of the first pole piece are provided with a first active material layer, so that the winding starting end of the first pole piece forms a double-sided area, and the winding starting end of the second pole piece No second active material layer is provided on the opposite sides of the current collector at the winding starting end, so that the winding starting end of the second pole piece forms an empty foil area, which is beneficial to reduce the occurrence of lithium deposition.
- the winding start ends of the first pole piece and the second pole piece are both double-sided areas, and the winding end ends are single-sided areas transitioning to the structure of the empty foil area, which is conducive to balancing the tension on the two pole pieces.
- the active material increases the energy density of the electrode assembly.
- the embodiment of the present application also provides a battery, the battery includes a casing and the electrode assembly described in the above embodiment, and the electrode assembly is arranged in the casing.
- An embodiment of the present application also provides an electric device, the electric device includes a circuit element and the battery described in the above embodiment, and the circuit element is electrically connected to the battery.
- the electric equipment includes but not limited to mobile phones, computers, mobile terminals and other electronic equipment.
- FIG. 1 is a schematic view of a winding structure of an electrode assembly in an embodiment.
- Fig. 2 is a front view and a side view of the unfolded structure of the first pole piece in the electrode assembly shown in Fig. 1 .
- Fig. 3 is a front view and a side view of the expanded structure of the second pole piece in the electrode assembly shown in Fig. 1 .
- FIG. 4 is a front view of the electrode assembly shown in FIG. 1 .
- FIG. 5 is a schematic structural view of the surfaces on both sides of the pole piece after removing tabs from the first pole piece and the second pole piece in the electrode assembly shown in FIG. 1 .
- FIG. 6 is a schematic structural view of the two sides of the pole piece after removing the lugs in an embodiment of the first pole piece.
- Fig. 7 is a schematic diagram of a partial connection structure between tabs and pole pieces in an embodiment.
- Fig. 8 is a schematic structural view of the two side surfaces of the first pole piece in an embodiment.
- Fig. 9 is a schematic structural view of the two side surfaces of the second pole piece in an embodiment.
- FIG. 10 is a schematic view of the winding structure of the electrode assembly with the pole pieces shown in FIG. 8 and FIG. 9 .
- FIG. 11 is a front view of the electrode assembly shown in FIG. 10 .
- Fig. 12 is a schematic structural view of the two side surfaces of the first pole piece in an embodiment.
- Fig. 13 is a schematic structural view of the two side surfaces of the second pole piece in an embodiment.
- Fig. 14 is a schematic view of the winding structure of the electrode assembly with the pole pieces shown in Fig. 12 and Fig. 13 .
- FIG. 15 is a front view of the electrode assembly shown in FIG. 14 .
- Fig. 16 is a schematic structural view of the two side surfaces of the first pole piece in an embodiment.
- Fig. 17 is a schematic structural view of the two side surfaces of the second pole piece in an embodiment.
- Fig. 18 is a schematic view of the winding structure of the electrode assembly with the pole pieces shown in Fig. 16 and Fig. 17 .
- Fig. 19 is a front view of the electrode assembly shown in Fig. 18 .
- Fig. 20 is a schematic structural view of an electrode assembly in a pair of proportions.
- Fig. 21 is a front view and a side view of the first pole piece in the electrode assembly shown in Fig. 20 .
- Fig. 22 is a front view and a side view of the second pole piece in the electrode assembly shown in Fig. 20 .
- Fig. 23 is a histogram of detection results of internal resistance between adjacent tabs of the electrode assembly shown in Fig. 20 .
- Fig. 24 is a histogram of detection results of the internal resistance between adjacent tabs of the electrode assembly shown in Fig. 1 .
- Fig. 25 is a schematic diagram of the structure of a battery in an embodiment.
- Fig. 26 is a schematic structural diagram of an electrical device in an embodiment.
- the first active material layer 12 is the first active material layer 12
- first and second are only used for descriptive purpose, and can not be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical feature.Thus , The features defined as “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple” is two or more , unless otherwise specifically defined.
- an electrode assembly 100 includes a first pole piece 10 , a second pole piece 20 and a separator 30 .
- the polarity of the first pole piece 10 and the second pole piece 20 are opposite, the isolation film 30 is arranged between the first pole piece 10 and the second pole piece 20, the first pole piece
- the sheet 10 , the separator 30 and the second pole sheet 20 are wound to form the electrode assembly 100 .
- the first pole piece 10 is provided with a first pole lug 40 and a third pole lug 60, the first pole lug 40, the third pole lug 60 and the first pole piece 10 have the same polarity,
- the second pole piece 20 is provided with a second pole lug 50 , and the polarity of the second pole piece 50 is the same as that of the second pole piece 20 .
- the electrode assembly 100 of the present application shunts the current flowing into the electrode assembly 100 by connecting the third tab 60 in parallel, so as to improve the overcurrent capability of the electrode assembly 100 .
- the first pole piece 10 includes a first current collector 11 and a first active material layer 12, and the first active material layer 12 is disposed on the surface of the first current collector 11 to A first coating area is formed.
- the first active material layer 12 is extended in a strip shape, and the first tab 40 and the third tab 60 are arranged at intervals in the first coating area.
- the first tab 40 and the third tab 60 divide the first coating area into a first part 111 , The second part 112 and the third part 113 .
- the length ratio of the first part 111, the second part 112 and the third part 113 is: 1:(0.5-1.5):(0.5-1.5), preferably 1:(0.8-1.2):(0.8 -1.2).
- the first direction A is the length direction of the pole piece in the unfolded state, and is also the winding direction of the electrode assembly 100.
- the second pole piece 20 includes a second current collector 21 and a second active material layer 22, and the second active material layer 22 is disposed on the surface of the second current collector 21 to A second coating area is formed, and the second tab 50 is disposed in the second coating area.
- the second tab 50 divides the second coating area into a fourth part 211 and a fifth part 212, along the winding direction of the second pole piece 20, that is, the winding direction of the electrode assembly 100,
- the length ratio of the fourth portion 211 to the fifth portion 212 is: 1:(0.5-1.5), preferably 1:(0.8-1.2).
- the above-mentioned electrode assembly 100 realizes shunting the current in parallel by adding the third tab 60 on the first pole piece 10, and the first tab 40, the second tab 50 and the third tab 60 divide the first pole
- the length of the active material layer on the piece 10 and the second pole piece 20 is divided according to a predetermined ratio, which can reduce the difference in resistance between adjacent tabs, make the internal resistance between adjacent tabs roughly the same, and fully utilize the charging speed and
- the advantage of reducing the temperature rise is to achieve the purpose of improving the overcurrent capacity of the electrode assembly and reducing the temperature rise of the electrode assembly.
- the first active material layer 12 is provided with a first groove 121 and a third groove 122 at intervals, the first tab 40 is arranged in the first groove 121 , and the first The tripole tab 60 is disposed in the third slot 122 .
- the length of the first active material layer 12 is L
- the distance between the first groove 121 and the third groove 122 is H, where
- first groove 121 and the third groove 122 are formed by missing the first active material layer 12 .
- the absence of the above-mentioned first active material layer 12 may expose the first current collector 11 , or expose other coatings coated on the surface of the first current collector 11 .
- the second active material layer 22 is provided with a second groove 221 , and the second tab 50 is disposed in the second groove 221 .
- the second groove 221 is approximately located in the middle of the second active material layer 22 .
- the second groove 221 is formed by missing the second active material layer 22 .
- the absence of the second active material layer 22 may expose the second current collector 21 , or expose other coatings coated on the surface of the second current collector 21 .
- the active material layers on both sides of the current collector are missing at positions corresponding to the grooves. That is to say, no active material layer is provided on both sides of the current collector in the first groove 121 , the second groove 221 and the third groove 122 , forming a local empty foil area.
- the first edge 1211 of the first groove 121 is flush with the first side 114 of the first current collector 11
- the second edge 1212 of the first groove 121 is flush with the first side 114 of the first current collector 11
- the second sides 115 of the first current collector 11 are arranged at intervals, which is beneficial to reduce the loss of the active material layer and maintain the energy density of the cell assembly.
- the second direction B is perpendicular to the first direction A. In the unfolded state of the pole piece, the second direction B refers to the width direction of the pole piece, which can also be said to be the length direction of the electrode assembly 100 in the rolled state.
- the structures of the third groove 122 and the second groove 221 are substantially the same as that of the first groove 121 , and will not be repeated here.
- first groove 121, the second groove 221, and the third groove 122 are obtained; before the current collector is coated with the active material layer, an adhesive tape can be attached to the corresponding position, and after the active material layer is coated on the surface of the current collector, tear off The tape is removed to expose the current collector, so as to obtain the first groove 121 , the second groove 221 and the third groove 122 .
- the first groove 121 runs through the first active material layer 12 .
- the first groove 121 can be formed on the first pole piece 10 by gap coating, that is, the active material layer is intermittently coated on the surface of the current collector according to a preset procedure to form the first groove 121 and the third groove 122, etc. , which is conducive to reducing the difficulty of the manufacturing process of the pole piece.
- the side of the first tab 40 is spaced apart from the side of the first groove 121 to reduce the problem of the tab contacting the active material.
- the distance between the side of the first tab 40 and the side of the first groove 121 is 2-2.5mm, so as to install the first tab 40 within the tolerance limit of the equipment and reduce the Problems with ear exposure to active substances.
- the width of the first tab 40 is 6-8mm, and the width of the first groove 121 is 10-13mm, so as to reduce the excessive loss of active material The impact of the energy density of the battery cell.
- the size of the second tab 50 and the third tab 60 is approximately the same as that of the first tab 40
- the size of the second slot 221 and the third slot 122 is approximately the same as that of the first slot 121 .
- the first pole piece 10 is a cathode piece
- the second pole piece 20 is an anode piece.
- the first pole tab 40 and the second pole tab 50 The third tab 60 is located at the same end of the electrode assembly 100 , and the second tab 50 is spaced between the first tab 40 and the third tab 60 .
- the third direction C is perpendicular to the first direction A.
- the third direction C is the thickness direction of the electrode assembly 100, and the staggered arrangement of multiple tabs can reduce the problem of uneven thickness of the electrode assembly caused by the superposition of the thickness of the tabs, which is conducive to improving the thickness of the electrode assembly.
- the problem of deformation during multiple charging and discharging there are at least two layers of the first pole piece 10 or the second pole piece 20 between adjacent tabs, preferably four layers of pole pieces, which is beneficial to avoid the single-layer pole piece. Adhesives are pasted in many places, resulting in inconsistent interface of the pole piece and circulation interface problem.
- the first tab 40 includes a first section 41 and a second section 42, the first section 41 is set in the first groove 121, and connected The first current collector 11, the second section 42 is bent toward the side of the first current collector 11 away from the first section 41, so that the bent lug exerts pressure on the pole piece , which is conducive to strengthening the connection relationship between the tab and the pole piece, and reducing the problem of the tab being separated from the pole piece due to external force.
- the first tab 40 and the third tab 60 may also be formed by part of the side surface of the first current collector 11 protruding from the first current collector 11 .
- the second tab 50 may be formed by part of the side surface of the second current collector 21 protruding from the second current collector 21 .
- the first tab 40 and the third tab 60 can be formed by cutting the first current collector 11, and the second tab 50 can be formed by cutting the second current collector 21.
- the first active material layer 12 and the The covering area of the second active material layer 22 can be reserved to the maximum extent, which is beneficial to increase the energy density of the electrode assembly 100 .
- the electrode assembly 200 of the second embodiment is substantially the same as the electrode assembly 100 of the first embodiment, the difference is that in the second embodiment, the first pole piece 10 is an anode
- the corresponding first tab 40 and the third tab 60 are anode tabs
- the second tab 20 is a cathode tab
- the corresponding second tab 50 is a cathode tab.
- the first tab 40 , the second tab 50 and the third tab 60 are located at the same end of the electrode assembly 200 , and the second tab 50 is spaced between the first tab 40 and the third tab 60 . between the third tabs 60 .
- the electrode assembly 300 of the third embodiment is substantially the same as the electrode assembly 100 of the first embodiment, the difference is that in the third embodiment, along the second direction B, the The first tab 40 protrudes from the first side 114 of the first current collector 11, the third tab 60 protrudes from the second side 115 of the first current collector 11, and the first tab 60 protrudes from the second side 115 of the first current collector 11.
- the arrangement direction of the dipole lug 50 on the second pole piece 20 is the same as that of the first pole lug 40 .
- the second tab 50 and the first tab 40 are located at the same end of the electrode assembly 300, the first tab 40 and the third tab 60 are respectively located at opposite ends of the electrode assembly 300, and the second The distance in the first direction A between the first tab 40 and the third tab 60 can be shortened, which facilitates the miniaturization of the battery.
- the electrode assembly 400 of the fourth embodiment is substantially the same as the electrode assembly 100 of the first embodiment, the difference is that in the fourth embodiment, the electrode assembly 400 also includes The fourth tab 70 , the fourth tab 70 is disposed in the second coating area, and the fourth tab 70 is spaced apart from the second tab 50 .
- the second tab 50 and the fourth tab 70 divide the second coating area into a fourth part 211, a fifth part 212 and a sixth part 213, along the winding direction of the second pole piece , the length ratio of the fourth part 211, the fifth part 212 and the sixth part 213 is: 1:(0.5-1.5):(0.5-1.5), preferably 1:(0.8-1.2): (0.8-1.2). In this way, the current can be further divided to reduce the temperature rise of the electrode assembly 400 .
- the first tab 40 , the second tab 50 , the third tab 60 and the fourth tab 70 are located at the same end of the electrode assembly 400 , and the second tab 50 and the fourth tab 70 is spaced between the first tab 40 and the third tab 60 .
- the first pole piece 10 is a cathode piece
- the second pole piece 20 is an anode piece.
- the first active material layer 12 is provided on opposite sides of the current collector at the winding starting end of the first pole piece 10 , so that the winding starting end of the first pole piece 10 forms a double-sided area.
- No second active material layer 22 is provided on the opposite sides of the current collector at the winding starting end of the second pole piece 20, so that the winding starting end of the second pole piece 20 forms an empty foil area, which is beneficial to Reduce the generation of lithium analysis inside the electrode assembly.
- the winding start ends of the first pole piece 10 and the second pole piece 20 are both double-sided areas, and the winding end ends are single-sided areas transitioning to an empty foil area, which is beneficial to balance the two sides.
- the active material on each pole piece increases the energy density of the electrode assembly.
- the electrode assembly 100 ′ is substantially the same as the electrode assembly 100 of the first embodiment, the difference is that in the first comparative example, the first tab 40 is arranged on The empty foil area at the winding starting end of the first pole piece 10, the third pole piece 60 is arranged on the first coating area of the first pole piece 10, the first pole piece 40 and the third pole piece 60 do not apply the first coating
- the layout area is divided according to a predetermined ratio. 23, it can be seen that after the electrode assembly 100' is wound and formed, the internal resistance difference between adjacent tabs is relatively large.
- FIG. 24 compared with the first comparative example, after the electrode assembly 100 is wound and formed in the first embodiment, the difference in internal resistance between adjacent tabs is significantly reduced.
- the content of the table below is the experimental results of charging and temperature rise data of the electrode assembly 100 of the first embodiment and the electrode assembly 100' of the first comparative example under the same charging system.
- the charging speed of the electrode assembly 100 of the first embodiment within 30 minutes is 3.2% higher than that of the first comparative example, thus proving that the electrode assembly 100 of the first embodiment can be charged by the first electrode
- the ear 40 and the third tab 60 are arranged in the first coating area according to a predetermined ratio, so as to reduce the difference in internal resistance between adjacent tabs, which can effectively improve the overcurrent capability of the electrode assembly 100, thereby increasing the charging speed of the electrode assembly 100 .
- the temperature rise data of the electrode assembly 100 of the first embodiment is 4.2°C lower than that of the first comparative example, thus proving that the electrode assembly 100 of the first embodiment can and the third tab 60 are arranged in the first coating area according to a predetermined ratio to reduce the difference in internal resistance between adjacent tabs, which can effectively reduce the temperature rise of the electrode assembly 100 and improve the safety of the electrode assembly 100 .
- the embodiment of the present application also provides a battery 500 , the battery 500 includes a casing 501 and the electrode assembly described in any one of the above embodiments, and the electrode assembly is arranged in the casing 501 .
- the embodiment of the present application also provides an electric device 600 , the electric device 600 includes a circuit element 601 and the battery 500 described in the above embodiment, and the circuit element 601 is electrically connected to the battery 500 .
- the electric device 600 includes, but is not limited to, electronic devices such as mobile phones, computers, and mobile terminals.
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Abstract
Description
Claims (17)
- 一种电极组件:包括:第一极片,所述第一极片上设有第一极耳;第二极片,所述第二极片上设有第二极耳;和隔离膜,设置于所述第一极片和所述第二极片之间,所述第一极片、所述隔离膜和所述第二极片卷绕形成所述电极组件;其特征在于,所述电极组件还包括第三极耳,所述第三极耳设于所述第一极片;所述第一极片包括第一集流体和第一活性物质层,所述第一活性物质层设于所述第一集流体的表面以形成第一涂布区;沿第一方向,所述第一活性物质层呈带状延伸设置;所述第一极耳和所述第三极耳间隔设置于所述第一涂布区;沿所述第一极片的卷绕方向,所述第一极耳和所述第三极耳将所述第一涂布区分为第一部分、第二部分和第三部分,所述第一部分、所述第二部分和所述第三部分的长度比例为:1:(0.5-1.5):(0.5-1.5)。
- 如权利要求1所述的电极组件,其特征在于,所述第一活性物质层上间隔设有第一槽和第三槽,所述第一极耳设于所述第一槽内,所述第三极耳设于所述第三槽内,沿所述第一方向,所述第一活性物质层的长度为L,所述第一槽与所述第三槽之间的距离为H,其中,|L/2-H|≤100mm,L≥700mm;其中,所述第一槽和所述第三槽由所述第一活性物质层缺失形成。
- 如权利要求2所述的电极组件,其特征在于,沿第二方向,所述第一槽贯穿所述第一活性物质层;所述第二方向与所述第一方向垂直。
- 如权利要求2所述的电极组件,其特征在于,沿第二方向,所述第一槽的第一边缘与所述第一集流体的第一侧边齐平,所述第一槽的第二边缘与所述第一集流体的第二侧边间隔设置;其中,所述第二方向垂直于所述第一方向。
- 如权利要求2所述的电极组件,其特征在于,沿所述第一方向,所述第一极耳的侧边与所述第一槽的侧边间隔设置。
- 如权利要求5所述的电极组件,其特征在于,沿所述第一方向,所述第一极耳的侧边与所述第一槽的侧边之间的距离为2-2.5mm。
- 如权利要求5所述的电极组件,其特征在于,沿所述第一方向,所述第一 极耳的宽度为6-8mm,所述第一槽的宽度为10-13mm。
- 如权利要求2所述的电极组件,其特征在于,所述第一极耳包括第一区段和第二区段,所述第一区段设于所述第一槽内,并连接所述第一集流体,所述第二区段朝向所述第一集流体背离所述第一区段的一侧弯折设置。
- 如权利要求1所述的电极组件,其特征在于,沿第二方向,所述第一集流体包括相对设置的第一侧边和第二侧边,所述第一极耳伸出所述第一侧边设置,所述第三极耳伸出所述第二侧边设置。
- 如权利要求1所述的电极组件,其特征在于,所述第一极耳和所述第二极耳由所述第一集流体的部分侧表面超出所述第一集流体形成。
- 如权利要求1所述的电极组件,其特征在于,所述第二极片包括第二集流体和第二活性物质层,所述第二活性物质层设于所述第二集流体的表面以形成第二涂布区,所述第二极耳设于所述第二涂布区。
- 如权利要求11所述的电极组件,其特征在于,所述第二极耳将所述第二涂布区分为第四部分和第五部分,沿所述第二极片的卷绕方向,所述第四部分与所述第五部分的长度比例为:1:(0.5-1.5)。
- 如权利要求11所述的电极组件,其特征在于,所述电极组件还包括第四极耳,所述第四极耳设于所述第二涂布区,且所述第四极耳与所述第二极耳间隔设置,所述第二极耳和所述第四极耳将所述第二涂布区分为第四部分、第五部分和第六部分,沿所述第二极片的卷绕方向,所述第四部分、所述第五部分和所述第六部分的长度比例为:1:(0.5-1.5):(0.5-1.5)。
- 如权利要求1所述的电极组件,其特征在于,沿第三方向,所述第一极耳、所述第二极耳和所述第三极耳在所述电极组件表面的投影不重叠;其中,所述第三方向与所述第一方向垂直。
- 如权利要求14所述的电极组件,其特征在于,沿所述第三方向,相邻极耳之间至少间隔两层所述第一极片或所述第二极片。
- 一种电池,其特征在于,所述电池包括壳体和权利要求1-15任一项所述的电极组件,所述电极组件设于所述壳体内。
- 一种用电设备,其特征在于,所述用电设备包括电路元件和权利要求16所述的电池,所述电路元件电连接所述电池。
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US20230207985A1 (en) * | 2021-12-24 | 2023-06-29 | Intel Corporation | Low profile battery cell |
CN114361563A (zh) * | 2022-01-07 | 2022-04-15 | 珠海冠宇电池股份有限公司 | 一种电芯结构及电池 |
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