CN112038706A - Lithium ion battery and roll core structure thereof - Google Patents
Lithium ion battery and roll core structure thereof Download PDFInfo
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- CN112038706A CN112038706A CN202011072390.5A CN202011072390A CN112038706A CN 112038706 A CN112038706 A CN 112038706A CN 202011072390 A CN202011072390 A CN 202011072390A CN 112038706 A CN112038706 A CN 112038706A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 29
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 65
- 239000011248 coating agent Substances 0.000 claims description 100
- 238000000576 coating method Methods 0.000 claims description 100
- 239000011148 porous material Substances 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 14
- 235000015110 jellies Nutrition 0.000 claims description 10
- 239000008274 jelly Substances 0.000 claims description 10
- 239000011149 active material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 7
- 210000004027 cell Anatomy 0.000 description 28
- 238000010586 diagram Methods 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000011888 foil Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 238000006748 scratching Methods 0.000 description 3
- 230000002393 scratching effect Effects 0.000 description 3
- 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 2
- 239000006183 anode active material Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- VWBWQOUWDOULQN-UHFFFAOYSA-N nmp n-methylpyrrolidone Chemical compound CN1CCCC1=O.CN1CCCC1=O VWBWQOUWDOULQN-UHFFFAOYSA-N 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
Abstract
The invention provides a lithium ion battery and a roll core structure thereof, wherein the roll core structure can comprise: a positive electrode strip, a negative electrode strip, and a separator strip; at least one positive electrode strip and at least one negative electrode strip are alternately overlapped at intervals by the separator strip and wound along the extending direction of the positive electrode strip and/or the negative electrode strip to form a winding core; the anode strip is provided with a plurality of first open hole sections at intervals along the extending direction of the anode strip, and the cathode strip is provided with a plurality of second open hole sections at intervals along the extending direction of the cathode strip; the extending directions of the first open hole section and the second open hole section are parallel to the reel shaft of the roll core. The invention provides a lithium ion battery and a roll core structure thereof, which can be rapidly molded, improve energy density, simplify the process and improve the production efficiency.
Description
Technical Field
The invention relates to a lithium ion battery and a roll core structure thereof.
Background
The lithium ion battery roll core structure in the prior art mainly comprises a winding type and a lamination type. Specifically, the winding core structure is formed by winding a separator between a strip-shaped positive electrode sheet and a strip-shaped negative electrode sheet. However, the jelly roll has an elliptical cross-section, and during the charge and discharge of the battery, the expansion and contraction of the electrodes may cause the gap between the electrodes to be non-uniform, thereby causing the degradation of the battery performance. Although the winding type winding core is suitable for a cylindrical battery, when the winding type winding core is applied to a square aluminum shell battery, the defects that a pole piece is easy to break at a bent part, an electrode active material falls off, the space utilization rate is low and the like occur; the tension of the front surface and the lateral surface of the winding core is inconsistent, so that the internal reaction is not uniform; meanwhile, the battery has the defects of longer pole piece, large internal resistance of the battery, inconvenience for high-rate charge and discharge and the like.
Furthermore, the laminated core structure is formed by continuously laminating the structure of a sheet-shaped positive pole piece, a sheet-shaped diaphragm and a sheet-shaped negative pole piece. The preparation process of the winding core is complex, a great deal of time and energy are needed to execute the sequential stacking process, the mechanical operation is not easy to realize, and the production efficiency is low; just, the negative pole piece all needs to be obtained through die-cut, and the diaphragm is easily impaled to the rim charge burr that produces, causes the inside short circuit of battery, and the pole piece section after the die-cut moreover, fall the material serious, also can influence the capacity promotion of battery etc..
Therefore, it is necessary to provide a winding core structure of a lithium ion battery to solve the above problems.
Disclosure of Invention
The invention aims to provide a lithium ion battery and a roll core structure thereof, which can be rapidly formed, improve energy density, simplify the process and improve production efficiency.
The above object of the present invention can be achieved by the following technical solutions: a lithium ion battery jelly roll structure, comprising: a positive electrode strip, a negative electrode strip, and a separator strip; at least one positive electrode strip and at least one negative electrode strip are alternately overlapped at intervals by the separator strip and wound along the extending direction of the positive electrode strip and/or the negative electrode strip to form a winding core; the anode strip is provided with a plurality of first open hole sections at intervals along the extending direction of the anode strip, and the cathode strip is provided with a plurality of second open hole sections at intervals along the extending direction of the cathode strip; the extending directions of the first open hole section and the second open hole section are parallel to the reel shaft of the roll core.
As a preferred embodiment, the positive electrode strip includes a first coating region and a plurality of first open-pore sections, and the first coating region is surrounded on the outer side of the plurality of first open-pore sections; an active material is disposed on the first coating region.
As a preferred embodiment, the first coating area comprises a plurality of first coating sections arranged side by side along the extending direction of the positive electrode strip, and one first open-pore section is arranged between every two adjacent first coating sections; and each first coating section is provided with a positive pole lug.
As a preferred embodiment, a plurality of the positive electrode tabs are alternately disposed on opposite sides of the first coating section from each other in the extending direction of the positive electrode strip.
As a preferred embodiment, the negative electrode strip includes a second coating region and a plurality of second open-pore sections, and the second coating region is surrounded on the outer side of the plurality of second open-pore sections; an active material is disposed on the second coating region.
As a preferred embodiment, the second coating area includes a plurality of second coating sections arranged in parallel along the extending direction of the negative electrode strip, and one second open-pore section is arranged between adjacent second coating sections; and each second coating section is provided with a negative pole tab.
As a preferred embodiment, a plurality of the anode tabs are alternately disposed on opposite sides of the second coating section from each other in the extending direction of the anode strip.
In a preferred embodiment, a plurality of the first perforated sections correspond to a plurality of the second perforated sections, and each of the first perforated sections is opposite to the corresponding second perforated section.
As a preferred embodiment, the positive electrode strip is further provided with a cutting area for cutting the winding core; the cutting area is perpendicular to the axis of the winding core.
As a preferred embodiment, the cutting area comprises a third opening and a fourth opening respectively arranged on the positive electrode strip and the negative electrode strip; the third opening and the fourth opening extend along the extending direction of the positive electrode strip and the negative electrode strip respectively.
As a preferred embodiment, the third opening divides the positive electrode strip into a first strip section and a second strip section; the length of the third opening is smaller than that of the positive electrode strip, so that the first section and the second section can be connected; the fourth opening divides the negative electrode strip into a third section and a fourth section; the length of the fourth opening is smaller than that of the negative electrode strip, so that the third strip section and the fourth strip section can be connected.
As a preferred embodiment, the first opening section comprises a first opening and a fifth opening located on the first strip section and the second strip section, respectively; the first opening is opposite to the fifth opening; the second opening section comprises a second opening and a sixth opening respectively positioned on the third strip section and the fourth strip section; the second opening is opposite to the sixth opening.
In a preferred embodiment, the positive electrode tape and the negative electrode tape are each one, and the positive electrode tape, the separator tape, the negative electrode tape, and the separator tape are stacked in this order and wound to form the winding core.
A lithium ion battery, comprising: a housing; at least one winding core disposed within the housing; the winding core has the structure.
The application provides a lithium ion battery and roll up core structure's beneficial effect is: the lithium ion battery and the roll core structure thereof provided by the embodiment of the application are provided with the positive electrode strip, the negative electrode strip and the diaphragm strip; a plurality of first open hole sections are arranged on the positive electrode strip at intervals along the extending direction of the positive electrode strip, and a plurality of second open hole sections are arranged on the negative electrode strip at intervals along the extending direction of the negative electrode strip; the extending directions of the first open hole section and the second open hole section are parallel to the reel shaft of the roll core; this is so that the core remains wound along the front and rear end regions of its winding shaft, while the central region assumes the laminated condition. The winding core has the advantages that the winding structure can be formed at high speed, the battery performance of the laminated structure is better, the positive electrode strip, the negative electrode strip and the diaphragm strip are in a continuous state, the procedures of pole piece slicing, pole piece stacking, pole piece transferring, pole piece feeding and the like in the traditional laminated structure manufacturing mode are not needed, and the manufacturing efficiency is greatly improved; and because the roll core only keeps the winding state at the two ends of the roll core, the risk of scratching when the roll core enters the shell can be greatly reduced. Therefore, the invention provides a lithium ion battery and a roll core structure thereof, which can be rapidly formed, and can improve energy density, simplify process and improve production efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a positive electrode strip according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a negative electrode strip according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present invention before being wound;
fig. 4 is a schematic structural diagram of a wound battery cell according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of two battery cells connected in parallel according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the edge positions of the first coating section and the second coating section inside the cell unit according to one embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of the front end region and the rear end region of the cell unit in fig. 6;
fig. 8 is a schematic cross-sectional view of a middle region of the cell unit in fig. 6.
Description of reference numerals:
13. a positive electrode strip; 14. a negative electrode strip; 15. a membrane strip; 17. a first open-hole section; 19. a second open-hole section; 21. a first coating zone; 22. a second coating zone; 25. a first coating section; 27. a positive electrode tab; 31. a negative electrode tab; 32. a cutting area; 33. a third opening; 35. a fourth opening; 37. a first strip section; 43. a second strip section; 45. a third segment; 47. a fourth segment; 49. a first opening; 51. a second opening; 53. fifth opening; 55. a sixth opening; 57. a battery cell monomer; 59. a fixing member; 61. a second coating section; 63. the edge position.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to fig. 1 to 8. The application provides a lithium ion battery rolls up core structure, it can include: a positive electrode ribbon 13, a negative electrode ribbon 14, and a separator ribbon 15; at least one of the positive electrode strips 13 and at least one of the negative electrode strips 14 are alternately stacked and spaced apart from each other by the separator tape 15, and are wound in the extending direction of the positive electrode strips 13 and/or the negative electrode strips 14 to form a winding core; a plurality of first perforated sections 17 are arranged on the positive electrode strip 13 at intervals along the extending direction of the positive electrode strip, and a plurality of second perforated sections 19 are arranged on the negative electrode strip 14 at intervals along the extending direction of the negative electrode strip; the first opening section 17 and the second opening section 19 extend in a direction parallel to the winding axis of the core.
The technical scheme shows that: the lithium ion battery roll core structure of the embodiment of the application is provided with a positive electrode strip 13, a negative electrode strip 14 and a separator strip 15; a plurality of first open hole sections 17 are arranged on the positive electrode strip 13 at intervals along the extending direction of the positive electrode strip, and a plurality of second open hole sections 19 are arranged on the negative electrode strip 14 at intervals along the extending direction of the negative electrode strip; the first 17 and second 19 open-pored sections extend in a direction parallel to the winding axis of the core; this is so that the core remains wound along the front and rear end regions of its winding shaft, while the central region assumes the laminated condition. The winding core has the advantages that the winding structure can be formed at a high speed, the battery performance of the laminated structure is better, the positive electrode strip 13, the negative electrode strip 14 and the diaphragm strip 15 are in a continuous state, the procedures of pole piece slicing, pole piece stacking, pole piece transferring, pole piece feeding and the like in the traditional laminated structure manufacturing mode are not needed, and the manufacturing efficiency is greatly improved; and because the roll core only keeps the winding state at the two ends of the roll core, the risk of scratching when the roll core enters the shell can be greatly reduced.
In the present embodiment, the positive electrode stripe 13 is continuous stripe-like as a whole. For example, as shown in fig. 1, the positive electrode strips 13 extend in the left-right direction. Further, the negative electrode stripe 14 is a continuous stripe as a whole. For example, as shown in fig. 2, the negative electrode stripe 14 extends in the left-right direction. Further, the membrane tape 15 is in a continuous strip shape as a whole. For example, as shown in FIG. 3, the diaphragm band 15 extends in the left-right direction.
In the present embodiment, at least one positive electrode stripe 13 and at least one negative electrode stripe 14 are spaced apart from each other by a separator stripe 15 and are alternately stacked. I.e. the positive strips 13 are superimposed with the negative strips 14. The extending direction (i.e., the longitudinal direction) of the positive electrode strips 13 thus coincides with the extending direction (i.e., the longitudinal direction) of the negative electrode strips 14. For example, as shown in fig. 3, the extending direction (i.e., the longitudinal direction) of the positive electrode strips 13 and the extending direction (i.e., the longitudinal direction) of the negative electrode strips 14 are both the left-right direction. Further, the number of the positive electrode strips 13 may be 1 or more. The number of the negative electrode strips 14 may be 1 or more. And a separator tape 15 is disposed between the positive electrode tape 13 and the negative electrode tape 14 to be able to separate the positive electrode tape 13 and the negative electrode tape 14. For example, as shown in fig. 3, the positive electrode strip 13 and the negative electrode strip 14 are each one, and the positive electrode strip 13, the separator strip 15, the negative electrode strip 14, and the separator strip 15 are stacked in this order.
Further, at least one positive electrode strip 13 and at least one negative electrode strip 14 are wound in the extending direction of the positive electrode strip 13 and/or the negative electrode strip 14 and form a winding core. For example, as shown in fig. 3 and 4, the positive electrode tape 13, the separator tape 15, the negative electrode tape 14, and the separator tape 15 are wound in the left-right direction to form a winding core as shown in fig. 4. The winding axis of the winding core is thus perpendicular to the direction of extension of the positive electrode strips 13 and/or the negative electrode strips 14. I.e. the winding axis of the winding core coincides with the width direction of the positive electrode strip 13 and/or the negative electrode strip 14.
In the present embodiment, the positive electrode stripe 13 is provided with a plurality of first perforated sections 17 at intervals in the extending direction thereof. For example, as shown in fig. 1, the positive electrode strip 13 is provided with 7 first perforated sections 17 at intervals in the left-right direction. Further, a plurality of second open sections 19 are provided at intervals on the negative electrode stripe 14 along the extending direction thereof. For example, as shown in fig. 2, 7 second perforated sections 19 are provided on the negative electrode stripe 14 at intervals in the left-right direction. Further, the first opening section 17 and the second opening section 19 extend in a direction parallel to the winding axis of the core. For example, as shown in fig. 1, the first perforated section 17 extends in the direction corresponding to the width direction of the positive electrode stripe 13. As shown in fig. 2, the second open segment 19 extends in the direction corresponding to the width direction of the negative electrode stripe 14. When the positive electrode strip 13, the separator strip 15, the negative electrode strip 14 and the separator strip 15 are wound in the longitudinal direction to form a winding core, the first opening section 17 and the second opening section 19 extend in the same direction as the winding axis of the winding core. In this manner, the core is still wound along the front and rear end regions of its winding shaft, while the central region assumes the laminated condition. The winding core has the advantages that the winding structure can be formed at a high speed, the battery performance of the laminated structure is better, the positive electrode strip 13, the negative electrode strip 14 and the diaphragm strip 15 are in a continuous state, the procedures of pole piece slicing, pole piece stacking, pole piece transferring, pole piece feeding and the like in the traditional laminated structure manufacturing mode are not needed, and the manufacturing efficiency is greatly improved; and because the roll core only keeps the winding state at the two ends of the roll core, the risk of scratching when the roll core enters the shell can be greatly reduced.
In one embodiment, the positive electrode stripe 13 includes a first coating region 21 and a plurality of first open pore segments 17. The first application zone 21 is enclosed outside the first perforated sections 17. For example, as shown in fig. 1, the first open-hole section 17 does not penetrate the positive electrode strip 13 in the width direction of the positive electrode strip 13. The positive strip 13 thus forms the first coating zone 21 circumferentially along the first open segment 17, and the first coating zone 21 is a continuous area. This prevents the first coating region 21 from being divided into a plurality of discrete sections by the first perforated section 17 when the first perforated section 17 penetrates the positive electrode stripe 13. Further, an active material is disposed on the first coating region 21. The first coating region 21 is a battery participating reaction region. The active material may be, for example, lithium iron phosphate, superconducting carbon black, PVDF (polyvinylidene fluoride), CNT (carbon nanotubes), NMP (N-Methyl pyrrolidone 1-Methyl-2-pyrrolidone), and the like. Further, when the positive electrode strip 13 is manufactured, the surface of the aluminum foil may be uniformly coated with the positive electrode active material, and then baked and rolled, and the first open-hole section 17 is cut off. The first open-hole section 17 may be cut off from the aluminum foil, and then the anode active material is coated and then the anode active material is baked and rolled, and the specific forming mode of the anode strip 13 is not limited in the present application.
Further, the first coating region 21 includes a plurality of first coating segments 25 arranged side by side in the extending direction of the positive electrode strip 13. As shown in fig. 1, for example, the first coating zone 21 includes 8 first coating segments 25. The 8 first coating segments 25 are arranged side by side in the left-right direction. Further, a first perforated section 17 is disposed between adjacent first coating sections 25. For example, as shown in fig. 1, the number of the first perforated sections 17 is 7. And the first coating sections 25 alternate with the first perforated sections 17. Such that the first perforated sections 17 space adjacent first coating sections 25 apart. So that when the positive electrode strip 13, the separator strip 15, the negative electrode strip 14, and the separator strip 15 as shown in fig. 3 are wound. The adjacent first coating segments 25 are still continuous along the front and rear end regions of the spool, while the middle region is interrupted by the first perforated segments 17, thus assuming a laminated state. Specifically, fig. 3 shows a schematic structural diagram of a cell provided in the embodiment of the present application before winding. Fig. 4 shows a schematic structural diagram of a wound battery cell provided in an embodiment of the present application. Fig. 6 shows a schematic diagram of edge positions 63 of the first coating segment 25 and the second coating segment 61 inside the cell unit 57 according to the embodiment of the present application. Fig. 7 is a schematic cross-sectional view of the front end region and the rear end region of the cell unit in fig. 6. Fig. 8 is a schematic cross-sectional view of a middle region of the cell unit in fig. 6. As can be seen from fig. 6, the first perforated section 17 is located in the middle area of the side edge of the cell unit 57 at the edge position 63 of the first coating section 25 inside the cell unit 57. As can be seen from fig. 7 and 8, the first coating section 25 inside the single cell 57 is still continuous along the front end region and the rear end region of the winding shaft, while the middle region is separated by the first perforated section 17, thereby showing a laminated state. Further, each first coating section 25 is provided with a positive tab 27. As shown in fig. 1, for example, the positive electrode tab 27 is disposed at one side of the first coating section 25.
Further, a plurality of positive electrode tabs 27 are alternately disposed on opposite sides of the first coating section 25 from each other in the extending direction of the positive electrode strip 13. For example, as shown in fig. 1, 8 positive electrode tabs 27 are alternately disposed to the left and right of the first coating section 25 in the left-right direction. Specifically, the first positive electrode tab 27 at the left end of the positive electrode strip 13 is disposed at the left side of the first coating section 25 at the left end of the positive electrode strip 13. The second positive electrode tab 27 at the left end of the positive electrode strip 13 is disposed at the right side of the second first coating section 25 at the left end of the positive electrode strip 13. A third positive electrode tab 27 at the left end of the positive electrode strip 13 is disposed at the left side of the third first coating section 25 at the left end of the positive electrode strip 13. A fourth positive electrode tab 27 at the left end of the positive electrode strip 13 is disposed at the right side of the fourth first coating section 25 at the left end of the positive electrode strip 13. A fifth positive electrode tab 27 at the left end of the positive electrode strip 13 is disposed on the left side of the fifth first coating section 25 at the left end of the positive electrode strip 13. A sixth positive electrode tab 27 at the left end of the positive electrode strip 13 is arranged at the right side of the sixth first coating section 25 at the left end of the positive electrode strip 13. A seventh positive electrode tab 27 at the left end of the positive electrode strip 13 is arranged at the left side of the seventh first coating section 25 at the left end of the positive electrode strip 13. An eighth positive electrode tab 27 at the left end of the positive electrode strip 13 is arranged at the right side of the eighth first coating section 25 at the left end of the positive electrode strip 13.
In one embodiment, the negative electrode stripe 14 comprises a second coating region 22 and a plurality of second open pore segments 19. The second application zone 22 surrounds the outside of the second open hole segments 19. For example, as shown, the second open-hole section 19 does not penetrate the negative electrode stripe 14 in the width direction of the negative electrode stripe 14. The negative electrode stripe 14 can form the second coating area 22 along the circumference of the second open pore section 19, and the second coating area 22 is a continuous area. This prevents the second coating region 22 from being divided into a plurality of discrete sections by the second perforated section 19 when the second perforated section 19 penetrates the negative electrode stripe 14. Further, an active material is disposed on the second coating region 22. The second coating region 22 is the cell-participating reaction region. The active material may be, for example, graphite, superconducting carbon black, CMC (sodium carboxymethyl cellulose), deionized water, or the like. Further, when the negative electrode strip 14 is manufactured, the surface of the aluminum foil may be uniformly coated with the negative electrode active material, and then baked, rolled, and cut off the second open section 19. The second open-hole section 19 may be cut off from the aluminum foil, and then the negative active material is coated and then the negative active material is baked and rolled, and the specific forming manner of the negative electrode strip 14 is not limited in the present application.
Further, the second coating region 22 includes a plurality of second coating segments arranged side by side in the extending direction of the negative electrode strips 14. For example, as shown in fig. 2, the second coating zone 22 includes 8 second coating segments. The 8 second coating sections are arranged in parallel along the left-right direction. Further, a second perforated section 19 is provided between adjacent second coating sections. For example, as shown in fig. 2, the number of the second perforated sections 19 is 7. And the second coating sections alternate with the second perforated sections 19. So that the second perforated section 19 can space apart adjacent second coating sections. So that when the negative electrode tape 14, the separator tape 15, the negative electrode tape 14, and the separator tape 15 as shown in fig. 3 are wound, the adjacent second coating sections are still in a continuous state along the front and rear end regions of the winding shaft, while the middle region is separated by the second perforated section 19, thereby assuming a laminated state. Specifically, fig. 3 shows a schematic structural diagram of a cell provided in the embodiment of the present application before winding. Fig. 4 shows a schematic structural diagram of a wound battery cell provided in an embodiment of the present application. Fig. 6 shows a schematic diagram of edge positions 63 of the first coating segment 25 and the second coating segment 61 inside the cell unit 57 according to the embodiment of the present application. Fig. 7 is a schematic cross-sectional view of the front end region and the rear end region of the cell unit in fig. 6. Fig. 8 is a schematic cross-sectional view of a middle region of the cell unit in fig. 6. As can be seen from fig. 6, the second perforated section 19 is located in the middle area of the side edge of the cell body 57 at the edge position 63 of the second coating section 61 inside the cell body 57. As can be seen from fig. 7 and 8, the second coating section 61 inside the single cell 57 is still continuous along the front end region and the rear end region of the winding shaft, while the middle region is separated by the second perforated section 19, thereby presenting a laminated state. Further, each second coating segment is provided with a negative electrode tab 31. For example, as shown in fig. 2, the negative electrode tab 31 is disposed at one side of the second coating section.
Further, a plurality of negative electrode tabs 31 are alternately disposed on opposite sides of the second coating section from each other in the extending direction of the negative electrode strips 14. For example, as shown in fig. 2, 8 negative electrode tabs 31 are alternately disposed to the left and right of the second coating section in the left-right direction. Specifically, the first negative electrode tab 31 at the left end of the negative electrode strip 14 is disposed at the right side of the first second coating section at the left end of the negative electrode strip 14. The second negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the left side of the second coating section at the left end of the negative electrode strip 14. The third negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the right side of the third second coating section at the left end of the negative electrode strip 14. The fourth negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the left side of the fourth second coating section at the left end of the negative electrode strip 14. The fifth negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the right side of the fifth second coating section at the left end of the negative electrode strip 14. The sixth negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the left side of the sixth second coating section at the left end of the negative electrode strip 14. The seventh negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the right side of the seventh second coating section at the left end of the negative electrode strip 14. The eighth negative electrode tab 31 at the left end of the negative electrode strip 14 is arranged at the left side of the eighth second coating section at the left end of the negative electrode strip 14.
In one embodiment, the plurality of first perforated segments 17 corresponds to the plurality of second perforated segments 19, and each first perforated segment 17 is directly opposite to the corresponding second perforated segment 19. For example, as shown, the first and second perforated sections 17 and 19 are each 7. Each first perforated section 17 is vertically opposite to the corresponding second perforated section 19. This allows the first and second perforated sections 17 and 19 to be simultaneously located on the side of the winding core when winding the positive electrode tape 13, the separator tape 15, the negative electrode tape 14, and the separator tape 15. Thereby forming the lamination state inside the winding core.
In one embodiment, the positive electrode tape 13 is further provided with a cutting area 32 for cutting the core. The cutting area 32 is perpendicular to the axis of the winding core. The cutting area 32 is located in the middle of the core, as shown for example in fig. 4. So that the core can be divided into two separate cell units 57 by cutting the cut 32. Further, the cutout area 32 includes third and fourth openings 33 and 35 provided on the positive electrode strip 13 and the negative electrode strip 14, respectively. The third and fourth apertures 33 and 35 extend in the extending direction of the positive electrode strips 13 and the negative electrode strips 14, respectively. The third opening 33 extends in the left-right direction, as shown in fig. 1, for example. As shown in fig. 2, the fourth aperture 35 extends in the left-right direction. Further, as shown in fig. 5, the two independent battery cells 57 may be stacked on top of each other and fixed by a fixing member 59 and connected in parallel to form a battery cell with a desired electric quantity. Of course, the two independent battery cells 57 are not limited to be connected in parallel, and may be used individually. The application does not limit the specific application mode of the cell unit 57.
Further, third apertures 33 divide positive strap 13 into first segment 37 and second segment 43. For example, as shown in fig. 1, the first strip section 37 and the second strip section 43 each extend in the left-right direction. And the first and second segments 37 and 43 are opposed in the up-down direction. Further, for example, the first strip section 37 may be positioned above the second strip section 43.
Further, the length of the third opening 33 is smaller than the length of the positive electrode stripe 13 so that the first and second segments 37 and 43 can be connected. For example, as shown in fig. 1, the left end of the third opening 33 is a closed end. And the left end of the third opening 33 is located at the right side of the left end of the positive electrode stripe 13, and then the left end of the third opening 33 forms a first connection region between the left ends of the positive electrode stripes 13. The first connection region connects the first segment 37 and the second segment 43, so that the first segment 37 and the second segment 43 are prevented from being in a disconnected state during the winding of the positive electrode tape 13, thereby facilitating the winding of the positive electrode tape 13.
Further, the fourth opening 35 divides the negative electrode stripe 14 into a third segment 45 and a fourth segment 47. For example, as shown in fig. 2, the third bar segment 45 and the fourth bar segment 47 each extend in the left-right direction. And the third segment 45 and the fourth segment 47 are opposed in the up-down direction. Further, for example, the third strip section 45 may be located above the fourth section 47.
Further, the length of the fourth opening 35 is smaller than the length of the negative electrode stripe 14, so that the third segment 45 and the fourth segment 47 can be connected. For example, as shown in fig. 2, the left end of the fourth opening 35 is a closed end. And the left end of the fourth opening 35 is located at the right side of the left end of the negative electrode stripe 14, so that a second connection region is formed between the left end of the fourth opening 35 and the left end of the negative electrode stripe 14. The second connection region connects the third segment 45 and the fourth segment 47, so that the third segment 45 and the fourth segment 47 are prevented from being in a disconnected state during the winding of the negative electrode strip 14, thereby facilitating the winding of the negative electrode strip 14.
Further, the first open section 17 includes a first opening 49 and a fifth opening 53 on the first section 37 and the second section 43, respectively. The first opening 49 and the fifth opening 53 are opposed. For example, as shown in fig. 1, the first strip section 37 is provided with 7 first openings 49. Each first aperture 49 extends in the width direction of the positive electrode stripe 13. The second strip section 43 is provided with 7 fifth openings 53. Each of the fifth openings 53 extends in the width direction of the positive electrode stripe 13. The 7 first openings 49 are opposed to the 7 fifth openings 53 in the up-down direction. Therefore, when the positive electrode strip 13, the separator strip 15, the negative electrode strip 14 and the separator strip 15 are wound, the first opening 49 and the fifth opening 53 can be located on the side of the winding core at the same time, and the winding core can be further divided into two independent cell units.
Further, the second perforated section 19 comprises a second and a sixth perforation 51, 55 on the third and fourth sections 45, 47, respectively. The second opening 51 is opposite to the sixth opening 55. For example, as shown in fig. 2, the third strip 45 is provided with 7 second openings 51. Each of the second apertures 51 extends in the width direction of the negative electrode stripe 14. The fourth strip section 47 is provided with 7 sixth openings 55. Each of the sixth apertures 55 extends in the width direction of the negative electrode stripe 14. The 7 second openings 51 are vertically opposite to the 7 sixth openings 55. Therefore, when the positive electrode strip 13, the separator strip 15, the negative electrode strip 14 and the separator strip 15 are wound, the second opening 51 and the sixth opening 55 can be located on the side of the winding core at the same time, and the winding core can be further divided into two independent cell units.
Further, the embodiment of the present application further includes a lithium ion battery, which includes: a housing; at least one winding core disposed within the housing; the winding core has the structure.
It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.
Claims (14)
1. The utility model provides a lithium ion battery roll core structure which characterized in that, it includes: a positive electrode strip, a negative electrode strip, and a separator strip; at least one positive electrode strip and at least one negative electrode strip are alternately overlapped at intervals by the separator strip and wound along the extending direction of the positive electrode strip and/or the negative electrode strip to form a winding core; the anode strip is provided with a plurality of first open hole sections at intervals along the extending direction of the anode strip, and the cathode strip is provided with a plurality of second open hole sections at intervals along the extending direction of the cathode strip; the extending directions of the first open hole section and the second open hole section are parallel to the reel shaft of the roll core.
2. The li-ion battery jelly roll structure of claim 1, wherein the positive electrode strip comprises a first coating region and a plurality of the first open pore sections, the first coating region being surrounded outside the plurality of first open pore sections; an active material is disposed on the first coating region.
3. The lithium ion battery roll core structure according to claim 2, wherein the first coating area comprises a plurality of first coating sections arranged in parallel along the extending direction of the positive electrode strip, and one first open-pore section is arranged between every two adjacent first coating sections; and each first coating section is provided with a positive pole lug.
4. The li-ion battery jelly roll structure of claim 3, wherein a plurality of the positive electrode tabs are alternately arranged on opposite sides of the first coating section from each other in an extending direction of the positive electrode tape.
5. The li-ion battery jelly roll structure of claim 1, wherein the negative electrode strip comprises a plurality of the second open segments and a second coating region, the second coating region being circumscribed by the plurality of the second open segments; an active material is disposed on the second coating region.
6. The lithium ion battery roll core structure according to claim 5, wherein the second coating area comprises a plurality of second coating sections arranged in parallel along the extending direction of the negative electrode strip, and one second open-pore section is arranged between every two adjacent second coating sections; and each second coating section is provided with a negative pole tab.
7. The li-ion battery jelly roll structure of claim 6, wherein a plurality of the anode tabs are alternately arranged on opposite sides of the second coating section from each other along the extension direction of the anode strip.
8. The li-ion battery jelly roll structure of claim 1, wherein a plurality of the first open pore sections correspond to a plurality of the second open pore sections, and each of the first open pore sections is directly opposite to the corresponding second open pore section.
9. The lithium ion battery roll core structure according to claim 1, wherein a cutting area for cutting the roll core is further arranged on the roll core; the cutting area is perpendicular to the axis of the winding core.
10. The li-ion battery jelly roll structure of claim 9, wherein the cutting area comprises a third opening and a fourth opening respectively disposed on the positive strip and the negative strip; the third opening and the fourth opening extend along the extending direction of the positive electrode strip and the negative electrode strip respectively.
11. The lithium ion battery jelly roll structure of claim 10, wherein the third opening separates the positive electrode strip into a first strip segment and a second strip segment; the length of the third opening is smaller than that of the positive electrode strip, so that the first section and the second section can be connected; the fourth opening divides the negative electrode strip into a third section and a fourth section; the length of the fourth opening is smaller than that of the negative electrode strip, so that the third strip section and the fourth strip section can be connected.
12. The li-ion battery jelly roll structure of claim 11, wherein the first opening section comprises first and fifth openings on the first and second segments, respectively; the first opening is opposite to the fifth opening; the second opening section comprises a second opening and a sixth opening respectively positioned on the third strip section and the fourth strip section; the second opening is opposite to the sixth opening.
13. The jelly-roll structure of claim 1, wherein the positive electrode strip and the negative electrode strip are both one, and the positive electrode strip, the separator strip, the negative electrode strip and the separator strip are sequentially stacked and wound to form the jelly-roll.
14. A lithium ion battery, comprising:
a housing;
at least one winding core disposed within the housing; the winding core has the structure of any one of claims 1 to 13.
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| CN202011072390.5A CN112038706B (en) | 2020-10-09 | 2020-10-09 | Lithium ion battery and roll core structure thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637906A (en) * | 2012-04-06 | 2012-08-15 | 宁德新能源科技有限公司 | Preparation method of winding-structure lithium ion battery |
| CN107768598A (en) * | 2017-10-19 | 2018-03-06 | 杭州金色能源科技有限公司 | The manufacture method of coiled lithium ion battery, core and coiling lithium electronic cell |
| CN110534797A (en) * | 2019-07-24 | 2019-12-03 | 珠海冠宇电池有限公司 | A kind of Special-shaped lithium battery and its manufacturing method |
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2020
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637906A (en) * | 2012-04-06 | 2012-08-15 | 宁德新能源科技有限公司 | Preparation method of winding-structure lithium ion battery |
| CN107768598A (en) * | 2017-10-19 | 2018-03-06 | 杭州金色能源科技有限公司 | The manufacture method of coiled lithium ion battery, core and coiling lithium electronic cell |
| CN110534797A (en) * | 2019-07-24 | 2019-12-03 | 珠海冠宇电池有限公司 | A kind of Special-shaped lithium battery and its manufacturing method |
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