CN105990610B - Flexible battery core - Google Patents
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- CN105990610B CN105990610B CN201510060842.0A CN201510060842A CN105990610B CN 105990610 B CN105990610 B CN 105990610B CN 201510060842 A CN201510060842 A CN 201510060842A CN 105990610 B CN105990610 B CN 105990610B
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- 239000011149 active material Substances 0.000 claims abstract description 91
- 229920000098 polyolefin Polymers 0.000 claims abstract description 86
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 239000003792 electrolyte Substances 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 192
- 230000002093 peripheral effect Effects 0.000 claims description 36
- 239000011247 coating layer Substances 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 238000007731 hot pressing Methods 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 19
- 238000004806 packaging method and process Methods 0.000 description 19
- 239000000758 substrate Substances 0.000 description 13
- 239000000919 ceramic Substances 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000010954 inorganic particle Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000013543 active substance Substances 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011244 liquid electrolyte Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention provides a kind of flexible battery core, including：First pole piece, including the first collector and the first active material layer；Second pole piece, including the second collector and the second active material layer；Isolation film；Electrolyte.First collector has around the first active material layer and is not provided with the first boundary region of the first active material layer；Second collector has around the second active material layer and is not provided with the second periphery white space of the second active material layer.Isolation film includes：Insulating layer；First polyolefin layer is bonded in the side of insulating layer, in face of the first active material layer；Second polyolefin layer is bonded in the opposite side of insulating layer, in face of the second active material layer；First boundary region bends and bonds together with the first polyolefin layer；Second periphery white space bends and bonds together with the second polyolefin layer.
Description
Technical Field
The invention relates to the field of energy storage devices, in particular to a flexible battery cell.
Background
Since the lithium ion battery has many advantages, such as high voltage, small volume, light weight, high specific capacity, no memory effect, no pollution, small self-discharge, and long cycle life, its application in the field of mobile devices, including mobile phones, video cameras, notebook computers, and other portable electrical appliances, has been unprecedented. As the technology development of mobile portable devices and the demand thereof increase, the demand of secondary batteries as an energy source has sharply increased. Among such secondary batteries, research into lithium secondary batteries having high energy density and discharge voltage has been widely conducted, and currently, they have been widely used.
With consumer interest, electronic devices are gradually becoming smaller and thinner. In such a battery design, it is necessary to diversify the shape of the battery with the shape of the device, and to efficiently use the internal space of the device, and therefore many batteries need to be designed in a manner to have flexibility.
A patent document CN103247768A published in chinese patent application No. 8/14/2013 discloses an electric power supply unit and a ceramic isolation layer thereof, wherein the ceramic isolation layer is disposed between a first electrode substrate and a second electrode substrate and is formed by adhering a plurality of ceramic particles by a dual adhesive system, and the dual adhesive system includes a linear polymer and a bridging polymer. The ceramic isolation layer is equivalent to a solid electrolyte, so that short circuit caused by contact of a positive electrode and a negative electrode can be effectively prevented, and the dynamic performance of the battery is greatly reduced, so that active ions are difficult to migrate back and forth; and the ceramic isolating layer is difficult to be bonded with the colloid packaging material because the ceramic is mainly metal oxide Al2O3It is difficult to form van der waals force or effective chemical bond with the colloid, thereby causing the failure of the package, so that a ceramic-containing composition should be avoided as an adhesive layer in the package structure.
Chinese patent application publication No. CN103187370A, published on 7/3/2013, discloses a side package structure of an electronic module, which includes an upper substrate, a lower substrate, and a sealing frame, wherein the sealing frame is disposed around the periphery of the upper substrate and the lower substrate and forms an accommodating space with the upper substrate and the lower substrate, and a main body of the sealing frame is formed by a silicone layer. However, due to the influence of the flatness of the substrate, the tight packaging interface is difficult to be ensured no matter the silica gel layer or other adhesive layer systems are used; and the adhesive layer is used as a packaging material, so that the material and manufacturing cost of the battery are increased, and the actual production and application are not facilitated.
Disclosure of Invention
In view of the problems in the background art, an object of the present invention is to provide a flexible battery cell, which can improve the packaging strength of the flexible battery cell.
Another object of the present invention is to provide a flexible electrical core, which can improve the energy density of the flexible electrical core.
It is yet another object of the present invention to provide a flexible electrical core that improves the flexibility of the flexible electrical core.
In order to achieve the above object, the present invention provides a flexible electrical core, comprising: a first pole piece including a first current collector and a first active material layer disposed on only one surface of the first current collector; a second pole piece, opposite in polarity to the first pole piece and stacked on each other, including a second current collector and a second active material layer disposed only on one surface of the second current collector opposite to the first current collector; the isolating film is positioned between the first pole piece and the second pole piece and covers and exceeds the first active material layer and the second active material layer; and (3) an electrolyte. Wherein the first current collector has a first peripheral blank region surrounding the first active material layer and not provided with the first active material layer; the second current collector has a second peripheral void region surrounding the second active material layer and not provided with the second active material layer. The separator includes: an insulating layer; a first polyolefin layer adhered to one side of the insulating layer to face the first active material layer; and a second polyolefin layer adhered to the other side of the insulating layer, facing the second active material layer; wherein the first peripheral margin area is bent and adhered to the first polyolefin layer of the barrier film; the second peripheral margin region is folded and bonded to the second polyolefin layer of the separator.
The invention has the following beneficial effects:
in the flexible battery cell of the invention, the first polyolefin layer and the second polyolefin layer of the isolating membrane are directly bonded with the first current collector and the second current collector respectively, compared with the prior art, the flexible battery cell has the advantages that the packaging position of the flexible battery cell does not contain a ceramic layer, the separator can be very firmly bonded with the first current collector and the second current collector, and do not receive the influence of the roughness difference of first mass flow body and second mass flow body, because of for the roughness of first mass flow body and second mass flow body is lower, the surface area of contact of the polyolefin of first polyolefin layer and second polyolefin layer is bigger respectively and even forms the form of colluding and bonds the body, promoted the adhesion force between the object greatly, make it be fit for being used for encapsulating flexible electric core more to the encapsulation intensity of flexible electric core has been improved. The higher the packaging strength is, the lower the risk of leakage is, thereby improving the safety performance of the flexible battery cell. Because the first current collector and the second current collector are respectively bonded with the first polyolefin layer and the second polyolefin layer, the first current collector and the second current collector form a whole, the strength of the interface bond of the whole package of the flexible battery cell is higher, the cohesive force is stronger, in other words, the external force required for destroying the package structure needs to be larger, and the flexibility of the battery cell is stronger. Because the packaging mode directly uses the polyolefin substrate for packaging without adhesive paper, namely the thickness space of the flexible cell is not occupied, and the energy density is higher. In the traditional rubberizing process, the positioning precision and the control tolerance of the rubberizing need to be considered, so that the rubberizing process has great risk in engineering, the excellent rate also has great influence inevitably, and the rubberizing process is omitted, so that the process is easier to realize. The invention directly uses the isolation film substrate for packaging without using other glue layers, effectively reduces the production material cost and the manufacturing cost of the flexible battery cell, and is suitable for continuous production.
Drawings
Fig. 1 is a plan view of a first pole piece of a flexible electrical core according to the present invention as it is being fabricated;
fig. 2 is a plan view of a first pole piece of the single flexible cell of fig. 1;
fig. 3 is a plan view of one side of a separator film when a flexible electrical core according to the present invention is manufactured;
fig. 4 is a plan view of a separator membrane of the single flexible cell of fig. 3;
fig. 5 is a plan view of the other side of the separator film when a flexible electrical core according to the present invention is manufactured;
fig. 6 is a plan view of a separator membrane of the single flexible cell of fig. 5;
fig. 7 is a plan view of a second pole piece of a flexible electrical core according to the present disclosure as it is being fabricated;
fig. 8 is a plan view of a second pole piece of the single flexible cell of fig. 7;
fig. 9 is a schematic view of an assembly of a flexible electrical core according to the present invention during manufacture;
fig. 10 is a cut-away view of an embodiment of a flexible electrical core according to the present invention as it is being manufactured;
fig. 11 is a cut-away view of another embodiment of a flexible cell according to the present invention as manufactured;
fig. 12 is a cut-away view of yet another embodiment of a flexible electrical core according to the present invention as it is being manufactured;
fig. 13 is a cut-away view of the flexible cell of fig. 7 after hot pressing during manufacture and before shearing, showing three flexible cells uncut;
fig. 14 is a schematic perspective view of fig. 13, showing three flexible cells uncut;
fig. 15 shows a single flexible cell obtained from fig. 14.
Wherein the reference numerals are as follows:
1 first pole piece 3 isolating film
11 first current collector 31 insulating layer
111 first peripheral margin 311 pores
12 first active material layer 32 first polyolefin layer
2 second pole piece 33 second polyolefin layer
21 second current collector 34 first coating layer
211 second peripheral margin 35 second coating layer
22 second active material layer
Detailed Description
A flexible electrical core according to the invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 15, a flexible battery cell according to the present invention includes: a first electrode sheet 1 including a first current collector 11 and a first active material layer 12 disposed on only one surface of the first current collector 11; a second pole piece 2, opposite in polarity to the first pole piece 1 and stacked on each other, including a second current collector 21 and a second active material layer 22 disposed only on one surface of the second current collector 21 opposite to the first current collector 11; a separator 3 located between the first and second pole pieces 1 and 2 and covering and exceeding the first and second active material layers 12 and 22; an electrolytic solution (not shown) for impregnating the first active material layer 12, the second active material layer 22, and the separator 3. Wherein the first current collector 11 has a first peripheral blank region 111 surrounding the first active material layer 12 and not provided with the first active material layer 12; the second collector 21 has a second peripheral blank region 211 surrounding the second active material layer 22 and not provided with the second active material layer 22. The separator 3 includes: an insulating layer 31; a first polyolefin layer 32 adhered to one side of the insulating layer 31, facing the first active material layer 12; and a second polyolefin layer 33 bonded to the other side of the insulating layer 31, facing the second active material layer 22; wherein the first peripheral margin region 111 is bent and adhered to the first polyolefin layer 32 of the separator 3; the second peripheral margin region 211 is bent and bonded to the second polyolefin layer 33 of the separator 3.
In the flexible battery cell of the invention, the first polyolefin layer 32 and the second polyolefin layer 33 of the isolating film 3 are directly bonded with the first current collector 11 and the second current collector 21 respectively, and are used as the packaging material of the flexible battery cell while playing a role of separating the first pole piece 1 and the second pole piece 2, compared with the prior art, the packaging position of the invention does not contain a ceramic layer, so that the isolating film 3 can be firmly bonded with the first current collector 11 and the second current collector 21, and is not influenced by the flatness difference of the first current collector 11 and the second current collector 21, because the lower the flatness of the first current collector 11 and the second current collector 21 is, the larger the surface contact area with the polyolefin of the first polyolefin layer 32 and the second polyolefin layer 33 respectively, and even a hook-shaped bonding body is formed, the bonding force between objects is greatly improved, and the flexible battery cell is more suitable for packaging, therefore, the packaging strength of the flexible battery cell is improved. The higher the packaging strength is, the lower the risk of leakage is, thereby improving the safety performance of the flexible battery cell. Because the first current collector 11 and the second current collector 21 are bonded to the first polyolefin layer 32 and the second polyolefin layer 33, respectively, and they form a whole, the interfacial bond of the entire package of the flexible cell has greater strength and higher cohesion, in other words, the external force required to break the package structure needs to be greater, and thus the flexibility of the cell is stronger. Because the packaging mode directly uses the polyolefin substrate for packaging without adhesive paper, namely the thickness space of the flexible cell is not occupied, and the energy density is higher. In the traditional rubberizing process, the positioning precision and the control tolerance of the rubberizing need to be considered, so that the rubberizing process has great risk in engineering, the excellent rate also has great influence inevitably, and the rubberizing process is omitted, so that the process is easier to realize. The invention directly uses the isolation film substrate for packaging without using other glue layers, effectively reduces the production material cost and the manufacturing cost of the flexible battery cell, and is suitable for continuous production.
In an embodiment of the flexible electrical core according to the present invention, the electrolyte is a liquid electrolyte. Because the liquid electrolyte is filled in the gaps of the pole piece active substance, the thickness space of the flexible battery cell is not occupied, and the dynamic performance, the energy density and the cost of the flexible battery cell are all more superior.
In an embodiment of the flexible cell according to the present invention, referring to fig. 1 and 2, and fig. 7 and 8, the first current collector 11 and the second current collector 21 are the same size; the first active material layer 12 is spaced a distance a from each edge of the surface of the first current collector 111And a is a1Not less than 4 mm; the second active material layer 22 is spaced a distance a from each edge of the surface of the second current collector 212And a is a2≥4mm。a1≥4mm、a2The encapsulation reliability and the capacity exertion of the flexible battery cell can be ensured by more than or equal to 4 mm.
In an embodiment of the flexible cell according to the present invention, referring to fig. 10 to 13, the first polyolefin layer 32, the second polyolefin layer 33 and the insulating layer 31 of the separator 3 are all of the same size and overlap.
In an embodiment of the flexible electrical core according to the present invention, the shape of the first active material layer 12 may be one of rectangular, circular, and triangular; the shape of the second active material layer 22 may be one of rectangular, circular, and triangular.
In an embodiment of the flexible cell according to the present invention, the first polyolefin layer 32 may be at least one of polyethylene, polypropylene, a mixture of ethylene and propylene; the second polyolefin layer 33 may be at least one of polyethylene, polypropylene, a mixture of ethylene and propylene.
In one embodiment of the flexible electrical core according to the present invention, the thickness of the first polyolefin layer 32 is greater than or equal to 30 μm; the thickness of the second polyolefin layer 33 is 30 μm or more. When the thickness is less than 30 μm, the adhesion strength between the first polyolefin layer 32 and the first current collector 11 of the first pole piece 1 is insufficient, and the adhesion strength between the second polyolefin layer 33 and the second current collector 21 of the second pole piece 2 is insufficient, which affects the packaging reliability of the flexible battery cell.
In an embodiment of the flexible electrical core according to the present invention, the insulating layer 31 of the isolation film 3 may be made of at least one of Polyamide (PI) and its compound, polyethylene terephthalate (PET) and its compound, and the material of the insulating layer 31 makes the isolation film 3 integrate the dual functions of insulation and high temperature resistance.
In an embodiment of the flexible electrical core according to the present invention, referring to fig. 12, the insulating layer 31 of the separator 3 may be provided with through micro holes 311 in the regions of the first active material layer 12 of the first pole piece 1 and the second active material layer 22 of the second pole piece 2, respectively. The micropores 311 of the insulating layer 31 make the separating film 3 facilitate permeation and infiltration of the electrolyte and transmission of lithium ions in the flexible battery cell during charging and discharging processes, and when the material of the insulating layer 31 has high temperature resistance (such as the above-mentioned polyamide and its composite and/or polyethylene terephthalate and its composite), the micropores 311 of the insulating layer 31 further integrate dual effects of insulation and high temperature resistance.
In an embodiment of the flexible electrical core according to the present invention, referring to fig. 3, fig. 4, fig. 5, fig. 6, and fig. 9 to fig. 13, the isolation film 3 may further include: a first coating layer 34 disposed on the first polyolefin layer 32 of the separator 3 within the first polyolefin layer 32 and correspondingly covering and extending beyond the first active material layer 12; and a second coating layer 35 disposed on the second polyolefin layer 33 of the separator 3 within the range of the second polyolefin layer 33 and correspondingly covering and exceeding the second active material layer 22; wherein the first peripheral margin region 111 is bent and adhered to the first polyolefin layer 32 of the separator 3; the second peripheral margin region 211 is bent and bonded to the second polyolefin layer 33 of the separator 3. In one embodiment, the first coating layer 34 may be at least one of an inorganic particle coating, a polymer coating, a hybrid coating containing inorganic particles and a polymer; the second coating layer 35 may be at least one of an inorganic particle coating layer, a polymer coating layer, a hybrid coating layer containing inorganic particles and polymers. The inorganic particles can effectively improve the thermal shrinkage of the separator, and the polymer can effectively improve the adhesive force between the separator and the active material layer, thereby improving the heat resistance of the separator and the adhesive strength of the interface.
In an embodiment of the flexible electrical core according to the present invention, the first coating layer 34 may have a thickness of 3 μm to 20 μm; the thickness of the second coating layer 35 may be 3 μm to 20 μm. When the thickness is less than 3 μm, effective isolation and bonding effects between the active material in the active material layer and the isolation film 3 cannot be ensured, and the interface of the flexible battery cell is affected. When the thickness is more than 20 μm, the exertion of the energy density of the flexible cell is influenced.
In an embodiment of a flexible electrical core according to the present invention, referring to fig. 3 and 4 and fig. 5 and 6, the first coating layer 34 is spaced a distance d from each edge of the first polyolefin layer 32 of the separator film 31And d is1Not less than 3 mm; the second coating layer 35 is spaced from each edge of the second polyolefin layer 33 of the separator 3 by a distance d2And d is2≥3mm。
In an embodiment of the flexible battery cell according to the present invention, the shape of the first coating layer 34 may be one of a rectangle, a circle, and a triangle corresponding to the shape of the first active material layer 12; the shape of the second coating layer 35 may be one of a rectangle, a circle, and a triangle corresponding to the shape of the second active material layer 22.
The flexible battery cell can be applied to watchbands, ornaments and wearable clothes, and is convenient to carry and light.
Next, a method for manufacturing a flexible battery cell according to the present invention, which is used for manufacturing the above-described flexible battery cell, is described, including the steps of: intermittently disposing the first active material layer 12 and the second active material layer 22 at a first prescribed spacing b1 and a second prescribed spacing b2 on the opposite surfaces of the first current collector 11 and the second current collector 21 of the first electrode sheet 1 and the second electrode sheet 2, respectively, the first current collector 11 having a first peripheral blank region 111 around the first active material layer 12 where the first active material layer 12 is not disposed, the second current collector 21 having a second peripheral blank region 211 around the second active material layer 22 where the second active material layer 22 is not disposed, the first electrode sheet 1 and the second electrode sheet 2 stacked on each other not having the first active material layer 12 and the second active material layer 22 on the surfaces of the first current collector 11 and the second current collector 21 located on the outer sides, respectively (refer to fig. 1 and 2, 3 and 4, 5 and 6, and 7 and 8); drying and dewatering the first pole piece 1, the isolating membrane 3 provided with the insulating layer 31 and the first polyolefin layer 32 and the second polyolefin layer 33 which are adhered to two opposite sides of the insulating layer 31, and the second pole piece 2; spraying an electrolyte on the first active material layer 12 and/or the second active material layer 22; stacking the first pole piece 1, the separation film 3, and the second pole piece 2 on each other (refer to fig. 9 in conjunction with fig. 10 to 12);
respectively hot-pressing a first peripheral blank region 111 on the surface of the first current collector 11 and a second peripheral blank region 211 on the surface of the second current collector 21 from the upper and lower sides to bend the first peripheral blank region 111 and bond the first polyolefin layer 32 of the separator 3 together, and bend the second peripheral blank region 211 and bond the second polyolefin layer 33 of the separator 3 together (see fig. 13), so as to form a plurality of flexible cells (see fig. 14); and vertically shearing in the horizontal direction at a portion where the first current collector 11 is bonded to the first polyolefin layer 32 of the separator 3 and at a portion where the second current collector 21 is bonded to the second polyolefin layer 33 of the separator 3, respectively, to make a single flexible cell (refer to fig. 15).
In an embodiment of the method for manufacturing a flexible electrical core according to the present invention, referring to fig. 1 and 2, and fig. 7 and 8, the first active material layer 12 is at a distance a from each edge of the surface of the first current collector 111，a1Not less than 4 mm; the second active material layer 22 is spaced a distance a from each edge of the surface of the second current collector 212And a is a2Not less than 4 mm; the first prescribed spacing b1 is not less than 8 mm; the second prescribed spacing b2 is not less than 8 mm. a is1≥4mm、a2The seal can be effectively guaranteed to be more than or equal to 4mmThe width, the packaging reliability are ensured, and the risks of short circuit and poor interface of the flexible battery cell are eliminated; the first prescribed interval b1 and the second prescribed interval b2 of not less than 8mm are also used for protecting a of the single flexible battery cell obtained after cutting1≥4mm、a2≥4mm。
In an embodiment of the method for manufacturing a flexible electrical core according to the present invention, the temperature for drying and removing water may be 60 ℃ to 120 ℃, and the drying time may be 4h to 12 h. The drying temperature and time are mutual influence factors, and when the drying temperature and time are too low, water removal is insufficient, so that the flexible battery cell is inflated and fails; when the temperature and time are too high, the exertion of the active substance in the active material layer is affected.
In an embodiment of the method for manufacturing a flexible electrical core according to the present invention, the humidity of the drying water removal is not greater than 2% RH. The humidity is controlled, so that water vapor can be prevented from entering active substances in the active material layer, and the final flexible battery core is prevented from being expanded and losing efficacy.
In one embodiment of the method for manufacturing a flexible electrical core according to the present invention, the amount of electrolyte sprayed may be 0.0020g/mAh to 0.0030 g/mAh. When the electrolyte amount is less than 0.0020g/mAh, the dynamic performance of the flexible electric core is reduced, and sufficient capacity is difficult to exert; when the electrolyte amount is greater than 0.0030g/mAh, the excessive electrolyte can damage the joint degree of the interface, so that the flexibility of the flexible battery cell is reduced.
In an embodiment of the method for manufacturing a flexible electrical core according to the present invention, the first pole piece 1, the isolation film 3, and the second pole piece 2 may be bonded together by hot pressing. In one embodiment, the hot pressing temperature can be 160 ℃ to 220 ℃, the pressure can be 0.2MPa to 1MPa, and the time can be 1s to 10 s. The temperature, the pressure and the time are factors which influence each other, and when the temperature, the pressure and the time are too low, the packaging effect of the packaging area is not good; when the temperature, pressure and time are excessively high, the separator 3 is easily shrunk, there is a risk of short-circuiting, and the active material particles in the active material layer may fall off to affect the exertion of capacity.
In an embodiment of the method for manufacturing a flexible electrical core, the formed current is less than 0.1C. When the current formed is greater than 0.1C, the current density is not uniform, which may cause local lithium precipitation of the flexible cell and may also affect the performance of the capacity.
In an embodiment of the method for manufacturing a flexible battery cell according to the present invention, the first polyolefin layer 32 of the separation film 3 may have: a first coating layer 34 located within the first polyolefin layer 32 and correspondingly covering and extending beyond the first active material layer 12 (see fig. 3 in combination with fig. 8 to 10); the second polyolefin layer 33 of the separator 3 may be provided with: a second coating layer 35 located within the range of the second polyolefin layer 33 and correspondingly covering and extending beyond the second active material layer 22 (refer to fig. 4 in conjunction with fig. 8 to 10); after the hot pressing, the first peripheral margin 111 is bent and bonded to the first polyolefin layer 32 of the separator 3, and the second peripheral margin 211 is bent and bonded to the second polyolefin layer 33 of the separator 3 (see fig. 11).
In an embodiment of the method for manufacturing a flexible battery cell according to the present invention, referring to fig. 11, hot pressing uses a square-shaped hot pressing end socket corresponding to upper and lower sides, the upper square-shaped hot pressing end socket corresponds to a first peripheral blank area 111 before hot pressing, the lower square-shaped hot pressing end socket corresponds to a second peripheral blank area 211 before hot pressing, an outer edge of the square-shaped hot pressing end socket is flush with an edge of the isolation film 3, a width of the square-shaped end socket is not less than 2mm (to ensure strength and reliability of the package), and horizontal distances between inner edges of the square-shaped end socket and the lower square-shaped end socket and between the first coating layer 34 and the second coating layer 35 are not less than 1mm, respectively (to leave enough heat radiation area to prevent active substances in the active material layer from being affected by heat, which. Compared with the normal strip-shaped hot-pressing end socket, the production efficiency of the double-shaped hot-pressing end socket can be obviously improved.
In an embodiment of the method for preparing a flexible electrical core according to the present invention, referring to fig. 3 and 4, a first distance between adjacent first coating layers 34 is c1，And c is1Not less than 6 mm; a second distance c between adjacent second coating layers 352And c is and c2Not less than 6 mm. When c1 and c2 are less than 6mm, the single flexible battery cell obtained after shearing cannot guarantee the packaging reliability and the exertion of capacity.
Claims (10)
1. A flexible electrical core comprising:
a first pole piece (1) comprising a first current collector (11) and a first active material layer (12) disposed on only one surface of the first current collector (11);
a second pole piece (2), opposite in polarity to the first pole piece (1) and superposed on each other, comprising a second current collector (21) and a second active material layer (22) provided only on one surface of the second current collector (21) opposite to the first current collector (11);
the isolation film (3) is positioned between the first pole piece (1) and the second pole piece (2) and covers and exceeds the first active material layer (12) and the second active material layer (22);
an electrolyte;
it is characterized in that the preparation method is characterized in that,
the first current collector (11) has a first peripheral blank region (111) surrounding the first active material layer (12) and not provided with the first active material layer (12);
the second current collector (21) has a second peripheral blank region (211) surrounding the second active material layer (22) and not provided with the second active material layer (22);
the separator (3) comprises:
an insulating layer (31);
a first polyolefin layer (32) adhered to one side of the insulating layer (31) to face the first active material layer (12); and
a second polyolefin layer (33) bonded to the other side of the insulating layer (31) facing the second active material layer (22);
wherein,
the first peripheral blank area (111) is bent and adhered with the first polyolefin layer (32) of the isolation film (3);
the second peripheral margin region (211) is folded and bonded to the second polyolefin layer (33) of the separator (3).
2. The flexible electrical core of claim 1,
the first current collector (11) and the second current collector (21) are the same in size;
the first active material layer (12) is at a distance a from each edge of the surface of the first current collector (11)1And a is a1≥4mm；
The distance between the second active material layer (22) and each edge of the surface of the second current collector (21) is a2And a is a2≥4mm。
3. The flexible electrical core of claim 1, wherein the first polyolefin layer (32), the second polyolefin layer (33), and the insulating layer (31) of the separator film (3) are of identical dimensions and overlap.
4. The flexible electrical core of claim 1,
the thickness of the first polyolefin layer (32) is more than or equal to 30 mu m;
the thickness of the second polyolefin layer (33) is not less than 30 μm.
5. The flexible electrical core according to claim 1, characterized in that the insulating layer (31) of the separator (3) is provided with through-going pores (311) in the regions corresponding to the first active material layer (12) of the first pole piece (1) and the second active material layer (22) of the second pole piece (2) that are adjacent.
6. The flexible electrical core of claim 1,
the separator (3) further comprises:
a first coating layer (34) which is arranged on the first polyolefin layer (32) of the isolation film (3) and is positioned in the range of the first polyolefin layer (32), and correspondingly covers and exceeds the first active material layer (12); and
a second coating layer (35) which is arranged on the second polyolefin layer (33) of the separation film (3), is positioned in the range of the second polyolefin layer (33), and correspondingly covers and exceeds the second active material layer (22);
wherein,
the first peripheral blank area (111) is bent and adhered with the first polyolefin layer (32) of the isolation film (3);
the second peripheral margin region (211) is folded and bonded to the second polyolefin layer (33) of the separator (3).
7. The flexible electrical core of claim 6,
the thickness of the first coating layer (34) is 3-20 μm;
the thickness of the second coating layer (35) is 3 μm to 20 μm.
8. The flexible electrical core of claim 6,
the first coating layer (34) is spaced from each edge of the first polyolefin layer (32) of the release film (3) by a distance d1And d is1≥3mm；
The second coating layer (35) is spaced from each edge of the second polyolefin layer (33) of the separator (3) by a distance d2And d is2≥3mm。
9. A method of making a flexible electrical core for use in making the flexible electrical core of any of claims 1-8, comprising the steps of:
a first active material layer (12) and a second active material layer (22) are intermittently provided at a first prescribed pitch b1 and a second prescribed pitch b2 on the facing surfaces of a first current collector (11) and a second current collector (21) of a first pole piece (1) and a second pole piece (2), respectively, the first current collector (11) has a first peripheral blank region (111) surrounding the first active material layer (12) without the first active material layer (12), the second current collector (21) has a second peripheral blank region (211) surrounding the second active material layer (22) without the second active material layer (22), the first pole piece (1) and the second pole piece (2) which are mutually overlapped are not provided with a first active material layer (12) and a second active material layer (22) on the surfaces, located on the outer sides, of the first current collector (11) and the second current collector (21) respectively;
drying and dewatering the first pole piece (1), the isolating film (3) provided with the insulating layer (31) and the first polyolefin layer (32) and the second polyolefin layer (33) which are adhered to the two opposite sides of the insulating layer (31), and the second pole piece (2);
spraying an electrolyte on the first active material layer (12) and/or the second active material layer (22);
mutually overlapping the first pole piece (1), the isolating film (3) and the second pole piece (2);
respectively carrying out hot pressing on a first peripheral blank area (111) on the surface of a first current collector (11) and a second peripheral blank area (211) on the surface of a second current collector (21) from the upper side and the lower side so as to enable the first peripheral blank area (111) to be bent and adhered with a first polyolefin layer (32) of the isolating membrane (3) and enable the second peripheral blank area (211) to be bent and adhered with a second polyolefin layer (33) of the isolating membrane (3) to manufacture a plurality of flexible battery cells; and
and (3) vertically shearing along the horizontal direction at the part where the first current collector (11) is adhered to the first polyolefin layer (32) of the isolating membrane (3) and at the part where the second current collector (21) is adhered to the second polyolefin layer (33) of the isolating membrane (3) correspondingly to form a single flexible battery core.
10. The method of making a flexible electrical core of claim 9,
the first polyolefin layer (32) of the separator (3) is provided with: a first coating layer (34) located within the first polyolefin layer (32) and correspondingly covering and extending beyond the first active material layer (12);
the second polyolefin layer (33) of the separator (3) is provided with: a second coating layer (35) located within the second polyolefin layer (33) and covering and exceeding the second active material layer (22) correspondingly;
after hot pressing, the first peripheral blank area (111) is bent and adhered to the first polyolefin layer (32) of the isolation film (3), and the second peripheral blank area (211) is bent and adhered to the second polyolefin layer (33) of the isolation film (3).
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| CN109585904B (en) * | 2017-09-29 | 2021-11-23 | 辉能科技股份有限公司 | Flexible lithium battery |
| CN109326831A (en) * | 2018-10-16 | 2019-02-12 | 深圳吉阳智能科技有限公司 | Core strueture, battery core manufacturing method and battery |
| WO2021195907A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Electrochemical apparatus and electronic apparatus |
| CN113711410A (en) * | 2021-03-31 | 2021-11-26 | 宁德新能源科技有限公司 | Electrode assembly and electronic device |
| CN113258175B (en) * | 2021-04-28 | 2023-06-16 | 山东金品能源有限公司 | Battery energy storage module |
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