CN117613344A - Multistage imbibition structure of cylinder battery - Google Patents
Multistage imbibition structure of cylinder battery Download PDFInfo
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- CN117613344A CN117613344A CN202311542958.9A CN202311542958A CN117613344A CN 117613344 A CN117613344 A CN 117613344A CN 202311542958 A CN202311542958 A CN 202311542958A CN 117613344 A CN117613344 A CN 117613344A
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- foil strip
- foil
- liquid suction
- positive
- negative electrode
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- 238000005213 imbibition Methods 0.000 title claims description 6
- 239000011888 foil Substances 0.000 claims abstract description 179
- 239000007788 liquid Substances 0.000 claims abstract description 115
- 238000000576 coating method Methods 0.000 claims abstract description 62
- 239000011248 coating agent Substances 0.000 claims abstract description 61
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 7
- 238000010030 laminating Methods 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 210000004027 cell Anatomy 0.000 abstract 2
- 210000004517 glycocalyx Anatomy 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 description 16
- 239000010410 layer Substances 0.000 description 13
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003466 welding Methods 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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
-
- 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
- H01M10/05—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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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)
- Secondary Cells (AREA)
Abstract
The invention discloses a multistage liquid absorption structure of a cylindrical battery, which comprises a bare cell, wherein the bare cell is a cylinder formed by sequentially laminating and winding a negative electrode plate, a diaphragm layer and a positive electrode plate, the negative electrode plate comprises at least one first foil strip arranged along the length direction of the negative electrode plate, at least one first liquid absorption hole is formed in the first foil strip, and negative electrode coating areas are formed on two sides of the first foil strip; the positive plate corresponds to the negative plate and comprises at least one second foil strip arranged along the length direction of the positive plate, the number of the second foil strips is the same as that of the first foil strips, at least one second liquid suction hole is formed in the second foil strips, and a negative electrode coating area of the bare cell coats the positive electrode coating area. According to the invention, liquid seepage can be carried out to the anode coating area and the cathode coating area through the first liquid suction holes on the first foil strip and the second liquid suction holes on the second foil strip, so that the rapid liquid injection production of the cylindrical battery is realized, and meanwhile, the cycle life of the cylindrical battery is improved.
Description
Technical Field
The invention relates to the field of cylindrical batteries, in particular to a multistage liquid absorption structure of a cylindrical battery.
Background
At present, the big cylinder lithium ion of full utmost point ear/sodium ion battery is owing to energy density is high, and capacity uniformity is good, can support advantages such as high multiplying power charge and discharge to become new energy industry mainstream product gradually, and conventional full utmost point ear cylinder battery includes the casing and locates the naked electric core in the casing, has the clearance between the peripheral wall of naked electric core and the shells inner wall, after annotating the liquid to the cylinder battery, the electrolyte gets into the full utmost point ear at the both ends of cylinder battery, the centre bore of naked electric core and between the peripheral wall of naked electric core and shells inner wall have the clearance and ooze liquid to the positive plate and the negative plate of naked electric core, the ooze liquid of the electrolyte of current cylinder battery has a problem:
1. in order to ensure the effect of laser penetrating through a welding current collecting disc, the whole lugs at the two ends of the cylindrical battery are generally compact in surface after being flattened, so that electrolyte slowly permeates into the bare cell from the whole lugs at the two ends during production, and longer electrolyte injection time is needed, so that the production capacity of the cylindrical battery is seriously influenced; 2. the surface of the cylindrical battery is compact after the full lugs at the two ends are rubbed or flattened, so that the consistency of electrolyte absorption of the positive plate and the negative plate is poor, and the cycle life of the battery is influenced; 3. longer cylindrical batteries are increasingly produced and used, and the demands for productivity and electrical performance cannot be met only by absorbing liquid at two ends of a bare cell.
Disclosure of Invention
The invention aims to provide a multistage liquid absorption structure of a cylindrical battery so as to realize rapid liquid injection of the cylindrical battery.
In order to achieve the above object, the invention provides a multi-stage liquid absorption structure of a cylindrical battery, which comprises a bare cell, wherein the bare cell is a cylinder formed by sequentially laminating and winding a negative electrode plate, a diaphragm layer and a positive electrode plate, the negative electrode plate comprises at least one first foil strip arranged along the length direction of the negative electrode plate, at least one first liquid absorption hole is arranged on the first foil strip, and negative electrode coating areas are arranged on two sides of the first foil strip; the positive plate corresponds to the negative plate and comprises at least one second foil strip arranged along the length direction of the positive plate, the number of the second foil strips is the same as that of the first foil strips, at least one second liquid suction hole is formed in the second foil strips, positive electrode coating areas are formed in two sides of the second foil strips, and the positive electrode coating areas of the bare cell are coated with the negative electrode coating areas.
Preferably, the two sides of the first foil strip are a first anode coating area and a second anode coating area, the two sides of the second foil strip corresponding to the first foil strip are a first cathode coating area and a second cathode coating area, the first foil strip has a first width, the second foil strip has a second width, and the first width is smaller than the second width so that the first anode coating area covers the first cathode coating area, and the second anode coating area of the bare cell covers the second cathode coating area.
Preferably, the first foil strip is provided with at least two first liquid suction holes, the diameters of at least two first liquid suction holes on the same first foil strip are the same, the second foil strip is provided with at least two second liquid suction holes, and the diameters of at least two second liquid suction holes on the same second foil strip are the same.
Preferably, the number of the first foil strips is at least two, the number of the second foil strips is at least two, one end of the cylindrical battery is provided with a liquid injection hole, the direction from the other end of the cylindrical battery to the liquid injection hole is a first direction, the at least two first foil strips are arranged along the first direction, and the diameters of the first liquid suction holes in the at least two first foil strips are gradually increased in the first direction; at least two second foil strips are arranged along the first direction, and the diameters of the second liquid suction holes on the at least two second foil strips become larger step by step in the first direction.
Preferably, the two adjacent first foil strips are a first negative electrode foil strip and a second negative electrode foil strip respectively, the first negative electrode foil strip and the second negative electrode foil strip are sequentially arranged along a first direction, the diameter of a first liquid suction hole on the second negative electrode foil strip is equal to the multiple of the diameter of the first liquid suction hole on the first negative electrode foil strip, and the range of the multiple is more than or equal to 1.2 and less than or equal to 1.5; the adjacent two second foil strips are respectively a first positive foil strip and a second positive foil strip, the first positive foil strip and the second positive foil strip are sequentially arranged along a first direction, the diameter of a second liquid suction hole on the second positive foil strip is equal to the multiple of the diameter of the second liquid suction hole on the first positive foil strip, and the range of the multiple is more than or equal to 1.2 and less than or equal to 1.5.
Preferably, the first foil strip is provided with at least two first liquid suction holes, the at least two first liquid suction holes are distributed at intervals, the second foil strip is provided with at least two second liquid suction holes, and the at least two second liquid suction holes are distributed at intervals.
Preferably, the first liquid suction holes and the second liquid suction holes on the wound bare cell are arranged along the radial direction of the bare cell and form at least two groups of radial arrangement holes, and an included angle between two adjacent groups of radial arrangement holes is greater than or equal to 30 degrees and less than or equal to 180 degrees.
Preferably, the first foil strip and the second foil strip are coated or attached with an insulating layer.
Preferably, the separator layer is disposed between the positive electrode sheet and the negative electrode sheet, and the separator layer is also disposed between the wound first foil strip and the second foil strip.
Preferably, the positive plate is provided with a positive full tab on the upper side in the width direction of the positive plate, the negative plate is provided with a negative full tab on the lower side in the width direction of the negative plate, the positive full tab is made of aluminum, and the negative full tab is made of copper or aluminum.
Compared with the prior art, the invention has the advantages that the first foil strip is arranged on the negative plate, the negative electrode coating areas are arranged on the two sides of the first foil strip, the second foil strip is arranged on the positive plate, and the positive electrode coating areas are arranged on the two sides of the second foil strip, so that the injected electrolyte can permeate into the positive electrode coating areas and the negative electrode coating areas through the first liquid suction holes on the first foil strip and the second liquid suction holes on the second foil strip, and the quick absorption of the electrolyte is facilitated even for bare cells with longer lengths, the quick liquid injection production of the cylindrical battery is realized, and the cycle life of the cylindrical battery is improved.
Drawings
Fig. 1 is a perspective view of a multi-stage liquid-absorbing structure of a cylindrical battery according to the present invention.
Fig. 2 is a view showing another angle of the multi-stage liquid suction structure of the cylindrical battery according to the present invention.
Fig. 3 is a schematic radial cross-sectional view of a multi-stage imbibition structure of a cylindrical battery of the invention showing the distribution of radially aligned pores.
Fig. 4 is a schematic structural view of a negative electrode sheet of a multi-stage imbibition structure of the cylindrical battery of the invention.
Fig. 5 is a schematic structural view of a positive electrode sheet of a multi-stage imbibition structure of a cylindrical battery of the invention.
Detailed Description
In order to describe the technical content, the constructional features and the effects achieved by the present invention in detail, the following description is made with reference to the embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 to 5, the present invention provides a multi-stage liquid absorbing structure of a cylindrical battery, the cylindrical battery includes a bare cell 10, the bare cell 10 is a cylinder formed by sequentially stacking and winding a negative electrode sheet 1, a separator layer and a positive electrode sheet 2, the negative electrode sheet 1 includes at least one first foil strip 11 arranged along the length direction of the negative electrode sheet 1, at least one first liquid absorbing hole 111 is arranged on the first foil strip 11, and negative electrode coating areas 12 are arranged on both sides of the first foil strip 11; the positive plate 2 is arranged corresponding to the negative plate 1 and comprises at least one second foil strip 21 arranged along the length direction of the positive plate 2, the number of the second foil strips 21 is the same as that of the first foil strips 11, at least one second liquid suction hole 211 is formed in the second foil strip 21, positive electrode coating areas 22 are formed in two sides of the second foil strip 21, and the positive electrode coating areas 22 are coated by the negative electrode coating areas 12 of the bare cell 10. Specifically, the cylindrical battery comprises a shell and a bare cell 10 arranged in the shell, wherein a gap is reserved between the outer peripheral wall of the bare cell 10 and the inner wall of the shell. As shown in fig. 4, the length direction of the negative electrode sheet 1 is shown by an arrow c, the first liquid suction hole 111 is a through hole penetrating through the thickness direction of the negative electrode sheet 1, as shown in fig. 5, the length direction of the positive electrode sheet 2 is shown by an arrow d, the second liquid suction hole 211 is a through hole penetrating through the thickness direction of the positive electrode sheet 2, the first foil strip 11 and the second foil strip 21 are arranged in a one-to-one correspondence manner, one or more first foil strips 11 and one or more second foil strips 21 can be arranged, in the embodiment of the invention, by arranging the first foil strip 11 on the negative electrode sheet 1, the two sides of the first foil strip 11 are respectively provided with the negative electrode coating region 12, and by arranging the second foil strip 21 on the positive electrode sheet 2, and arranging the two sides of the second foil strip 21 on the two sides of the second foil strip 21, the injected electrolyte can also carry out liquid suction to the positive electrode coating region 22 and the negative electrode coating region 12 through the first liquid suction hole 111 on the first foil strip 11 and the second foil strip 21, a liquid suction channel is increased, and even if the length of the cylindrical battery 10 is longer, the cylindrical battery can be produced, the cycle life of the cylindrical battery can be improved quickly, and the cycle life of the cylindrical battery can be improved quickly.
In the embodiment of the invention, the first anode coating area 121 and the second anode coating area 122 are respectively disposed on two sides of the first foil strip 11, the first cathode coating area 221 and the second cathode coating area 222 are respectively disposed on two sides of the second foil strip 21 corresponding to the first foil strip 11, the first foil strip 11 has a first width b1, the second foil strip 21 has a second width b2, and the first width b1 is smaller than the second width b2, so that the first anode coating area 121 of the bare cell covers the first cathode coating area 221, and the second anode coating area 122 covers the second cathode coating area 222. Specifically, as shown in fig. 4 to 5, the diameter of the first liquid suction hole 111 is smaller than the first width b1, and the diameter of the second liquid suction hole 211 is smaller than the second width b2, and since the first width b1 is smaller than the second width b2, that is, the projection of the first foil strip 11 in the stacking direction when the stack is not wound is located inside the projection of the corresponding second foil strip 21 in the stacking direction, the first negative electrode coating region 121 is made larger than and covers the first positive electrode coating region 221, and the second negative electrode coating region 122 is made larger than and covers the second positive electrode coating region 222.
In the embodiment of the present invention, at least two first liquid suction holes 111 are formed on the first foil strip 11, the diameters of at least two first liquid suction holes 111 on the same first foil strip 11 are the same, at least two second liquid suction holes 211 are formed on the second foil strip 21, and the diameters of at least two second liquid suction holes 211 on the same second foil strip 21 are the same. Specifically, the diameters of the at least two first liquid suction holes 111 on the same first foil strip 11 are the same, and the diameters of the at least two second liquid suction holes 211 on the same second foil strip 21 are the same, so that the processing of the first liquid suction holes 111 and the second liquid suction holes 211 is facilitated, and the time is saved.
In the embodiment of the invention, at least two first foil strips 11 are provided, at least two second foil strips 21 are provided, one end of the cylindrical battery is provided with a liquid injection hole, the direction of the other end of the cylindrical battery to the liquid injection hole is a first direction, at least two first foil strips 11 are arranged along the first direction, and the diameters of the first liquid suction holes 111 on at least two first foil strips 11 are gradually increased in the first direction; at least two second foil strips 21 are arranged in the first direction and the diameters of the second liquid suction holes 211 on the at least two second foil strips 21 become larger step by step in the first direction.
Specifically, the number of the first foil strips 11 and the second foil strips 21 may be two, three or more, the specific number of the first foil strips 11 and the second foil strips 21 may be selected according to actual needs, and not limited herein, as shown in fig. 4 to 5, the number of the first foil strips 11 and the second foil strips 21 may be two, for example, the liquid injection holes are disposed near the full tab 102 of the negative electrode, the adjacent two first foil strips 11 are a first negative electrode foil strip 112 and a second negative electrode foil strip 113, respectively, the first negative electrode foil strip 112 and the second negative electrode foil strip 113 are sequentially arranged along the first direction, the diameter of the first liquid suction hole 111 on the second negative electrode foil strip 113 is equal to the multiple of the diameter of the first liquid suction hole 111 on the first negative electrode foil strip 112, and the range of the multiple is greater than or equal to 1.2 and less than or equal to 1.5; the two adjacent second foil strips 21 are a first positive foil strip 212 and a second positive foil strip 213 respectively, the first positive foil strip 212 and the second positive foil strip 213 are sequentially arranged along the first direction, the diameter of the second liquid suction hole 211 on the second positive foil strip 213 is equal to the multiple of the diameter of the second liquid suction hole 211 on the first positive foil strip 212, and the multiple is in the range of 1.2 or more and 1.5 or less. By setting the pore diameters of the first liquid suction holes 111 and the second liquid suction holes 211 on the first foil strip 11 and the second foil strip 21 near the liquid suction holes to be maximum, it is possible to reduce the resistance of the flow of the electrolyte when the electrolyte flow rate is large, so that the electrolyte injection is faster.
In the embodiment of the present invention, at least two first liquid suction holes 111 are disposed on the first foil strip 11, at least two first liquid suction holes 111 are distributed at intervals, at least two second liquid suction holes 211 are disposed on the second foil strip 21, and at least two second liquid suction holes 211 are distributed at intervals.
Specifically, as shown in fig. 1 to 5, a plurality of first liquid suction holes 111 are uniformly distributed on each first foil strip 11, a plurality of second liquid suction holes 211 are uniformly distributed on each second foil strip 21, the first liquid suction holes 111 and the second liquid suction holes 211 on each first foil strip 11 and the corresponding second foil strip 21 after winding are arranged along the radial direction of the bare cell 10 and form at least two groups of radial arrangement holes 103, and an included angle a between two adjacent groups of radial arrangement holes 103 is greater than or equal to 30 degrees and less than or equal to 180 degrees. Specifically, the radial arrangement holes 103 are radially arranged to penetrate through the bare cell 10, so that the electrolyte in the central hole of the bare cell 10 and the electrolyte in the gap between the cylindrical battery case and the bare cell 10 can quickly and smoothly permeate from the radial arrangement holes 103 to the positive electrode coating region 22 and the negative electrode coating region 12, and the diameters of the first liquid suction holes 111 on the first foil strip 11 and the second liquid suction holes 211 on the corresponding second foil strip 21 are the same, so that the electrolyte flows in uniformly.
In the embodiment of the present invention, the insulating layer is coated or attached on each of the first foil strip 11 and the second foil strip 21, and the insulating layer may be an AT9 coating formed by coating. Specifically, the AT9 comprises boehmite, PVDF (polyvinylidene fluoride) and NMP (N-methylpyrrolidone), and the AT9 coating can effectively increase the strength of the positive electrode sheet 2 and the negative electrode sheet 1, and can make the first foil strip 11 and the second foil strip 21 have good insulation. Of course, in other embodiments, the first foil strip 11 and the second foil strip 21 may be coated with other insulating coatings or adhesive layers, and the specific insulating layer is not limited herein, and those skilled in the art may select according to practical situations.
In the embodiment of the invention, the diaphragm layer is arranged between the positive plate 2 and the negative plate 1, the diaphragm layer is also arranged between the wound first foil strip 11 and the wound second foil strip 21, the diaphragm layer is still arranged between the positive plate 2 and the negative plate 1, the electrolyte can flow between the first liquid suction hole 111, the diaphragm layer and the second liquid suction hole 211, and the liquid seepage effect is very good.
In the embodiment of the invention, the positive plate 2 is provided with a positive electrode full tab 101 at the upper side in the width direction, the negative plate 1 is provided with a negative electrode full tab 102 at the lower side in the width direction, the positive electrode full tab 101 is made of aluminum, the negative electrode full tab 102 is made of copper or aluminum, namely, when a lithium ion battery is used, the negative electrode full tab 102 is made of copper, and when a sodium ion battery is used, the negative electrode full tab 102 is made of aluminum. Specifically, as shown in fig. 4 to 5, the positive full tab 101 is located at the upper side of the bare cell 10, and the negative full tab 102 is located at the lower side of the bare cell 10, however, in some other embodiments, the positive full tab 101 and the negative full tab 102 may be located at the upper side of the bare cell 10, so as to achieve that the positive full tab 101 and the negative full tab 102 are located at the same end, so that the setting manners of the positive full tab 101 and the negative full tab 102 are not limited, and are selected according to actual needs of those skilled in the art.
The preparation method of the multistage liquid absorption structure of the cylindrical battery comprises the following steps: firstly, calculating the structures/sizes of the positive plate 2 and the negative plate 1 according to the size of a cylindrical bare cell 10 of a multi-stage liquid absorption structure of a cylindrical battery, the diameters/numbers of a first liquid absorption hole 111 and a second liquid absorption hole 211, the included angle between two adjacent radial arrangement holes 103, the numbers of a first foil strip 11 and a second foil strip 21 and the like; coating the positive electrode coating region 21 and the negative electrode coating region 12, AT9 coating the first foil strip 11 and the second foil strip 21, and the like; then winding the positive plate 2, the negative plate 1 and the diaphragm lamination layer; when the battery is assembled and injected, the bare cell 10 accelerates permeation and absorption from the plurality of penetrating radial arrangement holes 103, so that the rapid permeation and absorption of electrolyte are effectively accelerated, the rapid injection production of the battery is realized, and the cycle life of the cylindrical battery is improved.
The foregoing disclosure is merely illustrative of the principles of the present invention, and thus, it is intended that the scope of the invention be limited thereto and not by this disclosure, but by the claims appended hereto.
Claims (10)
1. A multistage imbibition structure of cylinder battery, its characterized in that: the cylindrical battery comprises a bare cell, wherein the bare cell is a cylinder formed by sequentially laminating and winding a negative electrode plate, a diaphragm layer and a positive electrode plate, the negative electrode plate comprises at least one first foil strip arranged along the length direction of the negative electrode plate, at least one first liquid suction hole is formed in the first foil strip, and negative electrode coating areas are formed in two sides of the first foil strip;
the positive plate corresponds to the negative plate and comprises at least one second foil strip arranged along the length direction of the positive plate, the number of the second foil strips is the same as that of the first foil strips, at least one second liquid suction hole is formed in the second foil strips, positive electrode coating areas are formed in two sides of the second foil strips, and the positive electrode coating areas of the bare cell are coated with the negative electrode coating areas.
2. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 1, wherein: the first foil strip is provided with a first positive electrode coating area and a second positive electrode coating area, the two sides of the first foil strip are respectively provided with a first positive electrode coating area and a second positive electrode coating area, the two sides of the second foil strip corresponding to the first foil strip are respectively provided with a first width, the second foil strip is provided with a second width, and the first width is smaller than the second width so that the first positive electrode coating area is coated by the first negative electrode coating area, and the second positive electrode coating area of the bare cell is coated by the second negative electrode coating area.
3. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 1, wherein: the first foil strips are provided with at least two first liquid suction holes, the diameters of the at least two first liquid suction holes on the same first foil strip are the same, the second foil strips are provided with at least two second liquid suction holes, and the diameters of the at least two second liquid suction holes on the same second foil strip are the same.
4. A multi-stage liquid absorbing structure for a cylindrical battery according to claim 3, wherein: the liquid injection holes are formed in one end of the cylindrical battery, the direction from the other end of the cylindrical battery to the liquid injection holes is a first direction, the at least two first foil strips are arranged along the first direction, and the diameters of the first liquid suction holes in the at least two first foil strips are gradually increased in the first direction; at least two second foil strips are arranged along the first direction, and the diameters of the second liquid suction holes on the at least two second foil strips become larger step by step in the first direction.
5. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 4, wherein: the two adjacent first foil strips are respectively a first negative electrode foil strip and a second negative electrode foil strip, the first negative electrode foil strip and the second negative electrode foil strip are sequentially arranged along a first direction, the diameter of a first liquid suction hole on the second negative electrode foil strip is equal to the multiple of the diameter of the first liquid suction hole on the first negative electrode foil strip, and the range of the multiple is more than or equal to 1.2 and less than or equal to 1.5; the adjacent two second foil strips are respectively a first positive foil strip and a second positive foil strip, the first positive foil strip and the second positive foil strip are sequentially arranged along a first direction, the diameter of a second liquid suction hole on the second positive foil strip is equal to the multiple of the diameter of the second liquid suction hole on the first positive foil strip, and the range of the multiple is more than or equal to 1.2 and less than or equal to 1.5.
6. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 1, wherein: the first foil strip is provided with at least two first liquid suction holes, the at least two first liquid suction holes are distributed at intervals, the second foil strip is provided with at least two second liquid suction holes, and the at least two second liquid suction holes are distributed at intervals.
7. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 6, wherein: the first liquid suction holes and the second liquid suction holes on the wound bare cell are arranged along the radial direction of the bare cell and form at least two groups of radial arrangement holes, and the included angle between every two adjacent groups of radial arrangement holes is larger than or equal to 30 degrees and smaller than or equal to 180 degrees.
8. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 1, wherein: insulating layers are coated or attached on the first foil strip and the second foil strip.
9. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 8, wherein: the separator layer is arranged between the positive electrode plate and the negative electrode plate, and the separator layer is also arranged between the first foil strip and the second foil strip after winding.
10. The multi-stage liquid absorbing structure of a cylindrical battery according to claim 1, wherein: the positive plate is provided with a positive full lug on the upper side of the width direction of the positive plate, the negative plate is provided with a negative full lug on the lower side of the width direction of the negative plate, the positive full lug is made of aluminum, and the negative full lug is made of copper or aluminum.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3220109U (en) * | 2018-11-30 | 2019-02-14 | 欣永立企業有限公司 | Conductive current collector for battery |
| US20220328884A1 (en) * | 2021-04-07 | 2022-10-13 | Jiangsu Contemporary Amperex Technology Limited | Electrode assembly, battery cell, battery, and manufacturing method and device for electrode assembly |
| CN218123451U (en) * | 2022-03-23 | 2022-12-23 | 惠州锂威新能源科技有限公司 | Battery current collector and battery pole piece |
| CN116365180A (en) * | 2023-04-04 | 2023-06-30 | 深圳埃克森新能源科技有限公司 | Full-lug rolled core, monopole column large cylindrical battery and preparation method of large cylindrical battery |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3220109U (en) * | 2018-11-30 | 2019-02-14 | 欣永立企業有限公司 | Conductive current collector for battery |
| US20220328884A1 (en) * | 2021-04-07 | 2022-10-13 | Jiangsu Contemporary Amperex Technology Limited | Electrode assembly, battery cell, battery, and manufacturing method and device for electrode assembly |
| CN218123451U (en) * | 2022-03-23 | 2022-12-23 | 惠州锂威新能源科技有限公司 | Battery current collector and battery pole piece |
| CN116365180A (en) * | 2023-04-04 | 2023-06-30 | 深圳埃克森新能源科技有限公司 | Full-lug rolled core, monopole column large cylindrical battery and preparation method of large cylindrical battery |
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