CN212676341U - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN212676341U CN212676341U CN202022005613.8U CN202022005613U CN212676341U CN 212676341 U CN212676341 U CN 212676341U CN 202022005613 U CN202022005613 U CN 202022005613U CN 212676341 U CN212676341 U CN 212676341U
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 53
- 238000004804 winding Methods 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims description 79
- 238000000576 coating method Methods 0.000 claims description 79
- 239000002003 electrode paste Substances 0.000 claims description 63
- 239000006071 cream Substances 0.000 claims description 30
- 239000010410 layer Substances 0.000 description 101
- 239000011247 coating layer Substances 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 8
- 229920001155 polypropylene Polymers 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- -1 Polyethylene Polymers 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- DZUDZSQDKOESQQ-UHFFFAOYSA-N cobalt hydrogen peroxide Chemical compound [Co].OO DZUDZSQDKOESQQ-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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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- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model provides a lithium ion battery, include the battery roll core that is formed by two at least positive plates and two at least negative plates. The at least two positive plates comprise a first positive plate and a second positive plate, the at least two negative plates comprise a first negative plate and a second negative plate, and the first positive plate, the first negative plate, the second positive plate and the second negative plate are sequentially stacked and then wound into a battery winding core. Under the prerequisite that battery capacity is unchangeable, the battery that adopts two positive plates, two negative pole pieces to form rolls up the core and shortens half than the pole piece length in the battery roll core that a positive plate and a negative pole piece are constituteed, can improve lithium ion battery's the speed of charging, and the positive plate impedance after parallelly connected reduces in addition, and negative pole piece impedance also reduces for whole lithium ion battery's impedance is showing and is reducing, has further improved lithium ion charging speed, has solved the slow problem of coiling formula lithium ion battery fast charge speed.
Description
Technical Field
The utility model relates to a battery application especially relates to a lithium ion battery.
Background
The lithium ion battery is a new generation of rechargeable battery following traditional storage batteries such as nickel-hydrogen batteries, has simple working principle, better safety and longer charging and discharging service life, and is considered as the first choice of a novel power source. The winding type lithium ion battery core structure is widely used as a lithium ion battery core structure due to high production efficiency. However, the cell structure of the wound lithium ion battery generally only comprises one positive plate and one negative plate, which limits the increase of the charging speed of the lithium ion battery, and has the problem of slow quick charging speed of the wound lithium ion battery.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a lithium ion battery has solved the slow problem of coiling formula lithium ion battery fast charge speed.
In order to achieve the above object, an embodiment of the present invention provides a lithium ion battery, which includes a battery roll core formed by at least two positive plates, at least two negative plates and a diaphragm. The battery winding core comprises at least two positive plates, at least two negative plates and at least one diaphragm, wherein the at least two positive plates comprise a first positive plate and a second positive plate, the at least two negative plates comprise a first negative plate and a second negative plate, the first positive plate, the first negative plate, the second positive plate and the second negative plate are sequentially stacked and then wound into the battery winding core, and the at least one diaphragm is arranged between the positive plates and the negative plates.
Optionally, the first positive plate includes a first positive current collector, a first positive paste layer, a second positive paste layer, and a first positive tab. First anodal mass flow body's first face and second face go up the coating respectively and have first anodal coating cream layer and second anodal coating cream layer, the coating length on first anodal coating cream layer is good at the coating length on second anodal coating cream layer, first anodal coating cream layer with second anodal coating cream layer is followed the first end of first anodal mass flow body begins the coating, first face with the second face does anodal mass flow body's relative two sides, first face does anodal mass flow body towards the one side of first negative pole piece, first anodal utmost point ear is located on the first anodal mass flow body.
Optionally, the coating length of the first positive electrode paste layer is shorter than the length of the first positive electrode current collector.
Optionally, first negative pole piece includes first negative pole mass flow body, first negative pole coating cream layer, second negative pole coating cream layer and first negative pole utmost point ear, wherein, the relative two sides of first negative pole mass flow body on the coating respectively have first negative pole coating cream layer and second negative pole coating cream layer, the coating length on first negative pole coating cream layer equals the coating length on second negative pole coating cream layer, first negative pole utmost point ear is located on the first negative pole mass flow body.
Optionally, the lithium ion battery further includes a diaphragm, where the diaphragm includes a first sub-diaphragm, a second sub-diaphragm, a third sub-diaphragm, and a fourth sub-diaphragm, and the first positive plate, the first sub-diaphragm, the first negative plate, the second sub-diaphragm, the second positive plate, the third sub-diaphragm, the second negative plate, and the fourth sub-diaphragm are sequentially stacked and wound into a battery roll core.
Optionally, the at least two positive plates further include a third positive plate, the at least two negative plates further include a third negative plate, and the first positive plate, the first negative plate, the third positive plate, the third negative plate, the second positive plate and the second negative plate are sequentially stacked and then wound into the battery winding core.
Optionally, the third positive plate includes the third positive current collector, the fifth positive coating cream layer, the sixth positive coating cream layer and the third positive electrode tab, wherein, the relative two sides of the third positive current collector are coated with the fifth positive coating cream layer and the sixth positive coating cream layer respectively, the coating length of the fifth positive coating cream layer equals the coating length of the sixth positive coating cream layer, the third positive electrode tab is located on the third positive current collector.
Optionally, the battery winding core further includes at least 4 tabs, and projections of the tabs in the thickness direction of the battery winding core are not overlapped.
Optionally, the tab is located on the same side of the first central plane of the battery roll core, and the first central plane of the battery roll core is a plane which is parallel to the thickness direction of the battery roll core in the normal direction and passes through the center of the battery roll core.
Optionally, the starting section and the ending section of the first positive electrode paste layer and the second positive electrode paste layer are on the same side of the second central plane of the battery roll core, and the second central plane of the battery roll core is perpendicular to the thickness direction of the battery roll core in the normal direction and penetrates through the center plane of the battery roll core.
In the embodiment of the utility model provides an in, lithium ion battery includes the battery roll core that is formed by two at least positive plates and two at least negative pole pieces. The at least two positive plates comprise a first positive plate and a second positive plate, the at least two negative plates comprise a first negative plate and a second negative plate, and the first positive plate, the first negative plate, the second positive plate and the second negative plate are sequentially stacked and then wound into a battery winding core. Under the prerequisite that battery capacity is unchangeable, adopt two positive plates, the battery that two negative pole pieces formed rolls up the core and shortens half than the pole piece length in the battery roll core that a positive plate and a negative pole piece are constituteed, can improve lithium ion battery's the speed of charging, the positive plate impedance after parallelly connected reduces in addition, and negative pole piece impedance also reduces for whole lithium ion battery's impedance is showing and is reducing, has further improved lithium ion charging speed, has solved the slow problem of coiling formula lithium ion battery fast charge speed.
Drawings
For a clearer explanation of the technical solutions in the embodiments of the present invention, the drawings in the specification are described below, it is obvious that the following drawings are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the listed drawings without creative efforts.
Fig. 1 is a structural diagram of a first positive plate in a lithium ion battery provided by an embodiment of the present invention;
fig. 2 is a structural diagram of a first negative plate in a lithium ion battery provided by an embodiment of the present invention;
fig. 3 is a structural diagram of a second positive plate in the lithium ion battery provided by the embodiment of the present invention;
fig. 4 is a structural diagram of a second negative plate in the lithium ion battery provided by the embodiment of the present invention;
fig. 5 is a structural diagram of a battery roll core in a lithium ion battery provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. On the basis of the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 5, to achieve the above object, an embodiment of the present invention provides a lithium ion battery including a battery roll core formed by at least two positive plates, at least two negative plates, and a separator. The battery winding core comprises at least two positive plates, a first negative plate, a second positive plate and a second negative plate, wherein the at least two positive plates comprise a first positive plate 10 and a second positive plate 30, the at least two negative plates comprise a first negative plate 20 and a second negative plate 40, the first positive plate 10, the first negative plate 20, the second positive plate 30 and the second negative plate 40 are sequentially stacked and then wound into the battery winding core, and at least one diaphragm is arranged between the positive plates and the negative plates.
As an example, the first positive electrode sheet 10 includes a first positive electrode collector 101, a first positive electrode paste layer 102, a second positive electrode paste layer 103, and a first positive electrode tab 104; the second positive plate 30 comprises a second positive current collector 301, a third positive paste layer 302, a fourth positive paste layer 303 and a second positive tab 304; the first negative electrode tab 20 includes a first negative electrode collector 201, a first negative electrode paste layer 202, a second negative electrode paste layer 203, and a first negative electrode tab 204; the second negative electrode tab 40 includes a second negative electrode collector 401, a third negative electrode paste layer 402, a fourth negative electrode paste layer 403, and a second negative electrode tab 404.
Above-mentioned anodal mass flow body can adopt the aluminium foil, the negative pole mass flow body can adopt the copper foil, active material in the anodal coating cream layer can be for cobalt dioxide, nickel cobalt manganese, lithium manganate etc, active material in the negative pole coating cream layer can be graphite, hard carbon, silicon, the inferior silicon oxide etc. two paste layers coat respectively on the relative two sides of mass flow body, the paste layer length of the relative two sides of mass flow body can equal, also can not be equal, the coating cream layer of the anodal mass flow body is relative with the paste layer of the negative pole mass flow body.
The tab is a conductive channel between the pole piece and the battery shell, and the voltage difference between the positive electrode and the negative electrode is transmitted to the lithium ion battery using body through the tab. The positive pole lug can be aluminium lug, and the negative pole lug can be nickel lug, can establish utmost point ear storage tank on the mass flow body in the pole piece, with utmost point ear paste weld in the utmost point ear storage tank, realize utmost point ear and the electric connection of mass flow body. In the embodiment of the present invention, the first positive tab is connected in parallel with the second positive tab, so that the first positive tab 10 is connected in parallel with the second positive tab 30; the first negative electrode tab is connected in parallel with the second negative electrode tab such that the first negative electrode tab 20 is connected in parallel with the second negative electrode tab 40.
The embodiment of the utility model provides an in, lithium ion battery includes first negative pole piece 20 and second negative pole piece 40, and first positive plate 10, first negative pole piece 20, second positive plate 30 and second negative pole piece 40 stack in proper order and become the battery roll core. The first positive plate 10 and the second positive plate are connected in parallel, the first negative plate 20 and the second negative plate are connected in parallel, on the premise that the battery capacity is not changed, the two positive plates are connected in parallel, the battery roll core formed by the two negative plates in parallel is half shorter than the pole piece in the battery roll core formed by one positive plate and one negative plate, the charging speed of the lithium ion battery can be improved, the impedance of the positive plate after being connected in parallel is reduced, the impedance of the negative plate is also reduced, the impedance of the whole lithium ion battery is obviously reduced, the lithium ion charging speed is further improved, and the problem that the quick charging speed of the winding type lithium ion battery is slow is solved.
Optionally, the first positive electrode sheet 10 includes a first positive electrode collector 101, a first positive electrode paste layer 102, a second positive electrode paste layer 103, and a first positive electrode tab 104. First positive pole coating paste layer 102 and second positive pole coating paste layer 103 have coated respectively on the first face and the second face of first positive pole current collector 101, the coating length of first positive pole coating paste layer 102 is good at the coating length of second positive pole coating paste layer 103, first positive pole coating paste layer 102 with second positive pole coating paste layer 103 follows the first end of first positive pole current collector 101 begins the coating, first face with the second face is the relative two sides of positive pole current collector, first face is the facing of positive pole current collector first negative pole piece 20's one side, first anodal utmost point ear 104 is located on the first positive pole current collector 101.
As shown in fig. 5, the first positive electrode tab is the one closest to the lithium ion roll core, and when the first positive electrode tab is wound into the roll core, the portion of the first positive current collector 101 opposite to the first positive current collector 101 after the first positive electrode tab is wound may not be coated with the paste coating layer, because the second positive paste coating layer 103 is opposite to the second positive paste coating layer 103 after the second positive paste coating layer 103 is coated, the active material in the paste coating layer cannot be utilized, and not only is the paste coating applied thereto wasted, but also the roll core thickness is increased. Therefore, the coating paste layer is not coated, the waste of the coating paste can be avoided, and the thickness of the winding core is reduced. The first end of the first positive electrode current collector 101 is the end of the first positive electrode plate 10 far away from the winding core, the first positive electrode paste layer 102 and the second positive electrode paste layer 103 are uniformly and continuously coated from the first end of the first positive electrode current collector 101, and the coating length of the first positive electrode paste layer 102 is longer than that of the second positive electrode paste layer 103.
The first positive electrode tab 104 can be arranged at any position on the first positive electrode current collector 101, a tab accommodating groove can be arranged on the current collector in the pole piece, and the tab is welded in the tab accommodating groove to realize the electric connection of the tab and the current collector.
Similarly, as shown in fig. 5, the second positive electrode tab 30 includes a second positive electrode collector 301, a third positive electrode paste layer 302, a fourth positive electrode paste layer 303, and a second positive electrode tab 304. The opposite surfaces of the second positive electrode current collector 301 are coated with a third positive electrode paste layer 302 and a fourth positive electrode paste layer 303 respectively, the coating length of the third positive electrode paste layer 302 is longer than that of the fourth positive electrode paste layer 303, and the third positive electrode paste layer 302 and the fourth positive electrode paste layer 303 are coated from the first end of the second positive electrode current collector 301. The first end of the second positive current collector 301 is the end near the winding core, part of the second positive current collector 301 is located on the outermost layer of the winding core after the second positive plate 30 is wound, only the third positive paste coating layer 302 of the part of the second positive current collector 301 can be opposite to the paste coating layer of the second negative plate, therefore, if the fourth positive paste coating layer 303 is coated on the part, no negative paste coating layer is opposite to the part, active substances in the paste coating layer cannot be utilized, the paste coating applied on the part is wasted, and the thickness of the winding core is increased.
The second positive electrode tab 304 can be arranged at any position on the second positive electrode current collector 301, a tab accommodating groove can be arranged on the current collector in the pole piece, and the tab is welded in the tab accommodating groove to realize the electric connection of the tab and the current collector.
Alternatively, as shown in fig. 1, the coating length of the first positive electrode paste layer 102 is shorter than the length of the first positive electrode collector 101.
Because the coating length of the first positive electrode paste layer 102 is longer than that of the second positive electrode paste layer 103, only one side of the first positive electrode collector 101 is coated with the first positive electrode paste layer 102 at the second end of the first positive electrode plate 10, and the coating length of the first positive electrode paste layer 102 is shorter than that of the first positive electrode collector 101, so that part of the two sides of the first positive electrode collector 101 at the second end of the first positive electrode plate 10 are not coated with the paste layers. The second end through setting up first positive plate 10 has the two-sided all uncoated coating cream layer of some first positive current collector 101, can prevent that the pole piece from crumpling, leads to the book core unevenness.
Similarly, as shown in fig. 3, since the coating length of the third positive electrode paste layer 302 is longer than the coating length of the fourth positive electrode paste layer 303, only one side of the second positive electrode collector 301 is coated with the third positive electrode paste layer 302 at the second end of the second positive electrode sheet 30, and the coating length of the third positive electrode paste layer 302 is shorter than the length of the second positive electrode collector 301, so that a part of the second positive electrode collector 301 at the second end of the second positive electrode sheet 30 is not coated with the paste layers on both sides. The second end through setting up the second positive plate 30 has some second positive current collector 301 two-sided all uncoated coating cream layer, can prevent that the pole piece from crumpling, leads to the book core unevenness.
Optionally, as shown in fig. 2, the first negative electrode tab 20 includes a first negative electrode collector 201, a first negative electrode paste layer 202, a second negative electrode paste layer 203, and a first negative electrode tab 204, wherein opposite sides of the first negative electrode collector 201 are respectively coated with the first negative electrode paste layer 202 and the second negative electrode paste layer 203, a coating length of the first negative electrode paste layer 202 is equal to a coating length of the second negative electrode paste layer 203, and the first negative electrode tab 204 is disposed on the first negative electrode collector 201.
First negative pole utmost point ear 204 can locate the optional position on the first negative current collector 201, can establish utmost point ear storage tank on the mass flow body in the pole piece, with utmost point ear paste weld in the utmost point ear storage tank, realize utmost point ear and the electric connection of the mass flow body.
Similarly, as shown in fig. 4, the second negative electrode tab 40 includes a second negative electrode collector 401, a third negative electrode paste layer 402, a fourth negative electrode paste layer 403, and a second negative electrode tab 404, wherein opposite sides of the second negative electrode collector 401 are coated with the third negative electrode paste layer 402 and the fourth negative electrode paste layer 403, respectively, a coating length of the third negative electrode paste layer 402 is equal to a coating length of the fourth negative electrode paste layer 403, and the second negative electrode tab 404 is disposed on the second negative electrode collector 401.
The second negative electrode tab 404 may be disposed at any position on the second negative electrode current collector 401, and a tab receiving groove may be disposed on the current collector in the electrode plate, so as to attach and weld the tab in the tab receiving groove, thereby achieving the electrical connection between the tab and the current collector.
Optionally, as shown in fig. 5, the lithium ion battery further includes a separator 501, where the separator 501 includes a first sub-separator, a second sub-separator, a third sub-separator, and a fourth sub-separator, and the first sub-separator, the second sub-separator, the third sub-separator, and the fourth sub-separator are shown by dotted lines in fig. 5. The first positive plate 10, the first sub-diaphragm, the first negative plate 20, the second sub-diaphragm, the second positive plate 30, the third sub-diaphragm, the second negative plate 40 and the fourth sub-diaphragm are sequentially stacked and wound into a battery winding core.
The utility model discloses a diaphragm 501 can be conventional lithium battery diaphragm, and it contains substrate and coating, and wherein the substrate can be Polyethylene (PE) single layer membrane, polypropylene (PP) single layer membrane or PP/PE/PP three-layer complex film, and the coating can be at least one in porous silica, aluminium oxide, titanium dioxide, the zirconium dioxide. The diaphragm is an insulator of the positive and negative pole pieces, and the diaphragm is arranged between the positive and negative pole pieces, so that the resistance value in short circuit can be increased, the short-circuit current is reduced, and the local heat balance failure is prevented.
Optionally, the at least two positive plates further include a third positive plate, the at least two negative plates further include a third negative plate, and the first positive plate 10, the first negative plate 20, the third positive plate, the third negative plate, the second positive plate 30, and the second negative plate 40 are sequentially stacked and then wound into the battery roll core.
Specifically, the first positive tab, the second positive tab and the third positive tab are connected in parallel, so that the first positive plate 10, the second positive plate 30 and the third positive plate are connected in parallel; the first negative electrode tab, the second negative electrode tab and the third negative electrode tab are connected in parallel, so that the first negative electrode tab 20, the second negative electrode tab 40 and the third negative electrode tab are connected in parallel. Under the unchangeable prerequisite of battery capacity, adopt three positive plate parallelly connected, the parallelly connected battery of three negative pole piece rolls up the core and shortens two-thirds than the pole piece length in the battery roll core that a positive plate and a negative pole piece constitute, can improve lithium ion battery's the speed of charging, and the positive plate impedance after parallelly connected reduces in addition, and negative pole piece impedance also reduces for whole lithium ion battery's impedance is showing and is reducing, has further improved lithium ion charging speed.
Optionally, the third positive plate includes the third positive current collector, the fifth positive coating cream layer, the sixth positive coating cream layer and the third positive electrode tab, wherein, the relative two sides of the third positive current collector are coated with the fifth positive coating cream layer and the sixth positive coating cream layer respectively, the coating length of the fifth positive coating cream layer equals the coating length of the sixth positive coating cream layer, the third positive electrode tab is located on the third positive current collector.
After the third positive plate is wound into a winding core, the fifth positive paste layer and the sixth positive paste layer are opposite to the negative paste layer, so that the opposite two surfaces of the third positive current collector are respectively coated with the fifth positive paste layer and the sixth positive paste layer which are equal in length.
The third positive pole tab can be arranged at any position on the third positive pole current collector, a tab accommodating groove can be arranged on the current collector in the pole piece, and the tab is welded in the tab accommodating groove to realize the electric connection of the tab and the current collector.
Optionally, the battery winding core further includes at least 4 tabs, and the tabs do not overlap in a projection in the thickness direction of the battery winding core. The tab thickness is thick, if the tab is in overlap in the battery roll core thickness direction, can influence lithium ion battery's roughness. In addition, the tabs with different polarities are overlapped, and the situation that the positive and negative tabs are short-circuited is easy to occur. Therefore, the flatness of the lithium ion battery can be ensured by enabling the lugs not to be overlapped in the thickness direction of the battery roll core, and the situation that the positive lugs and the negative lugs are short-circuited due to the overlapping of the lug positions with different polarities is avoided.
Optionally, the tab is located on the same side of the first central plane of the battery roll core, and the first central plane of the battery roll core is a plane which is parallel to the thickness direction of the battery roll core in the normal direction and passes through the center of the battery roll core. So that the distance between the lugs can be accurately controlled in an on-line detection mode.
Optionally, the starting section and the ending section of the first positive electrode paste layer and the second positive electrode paste layer are on the same side of the second central plane of the battery roll core, and the second central plane of the battery roll core is perpendicular to the thickness direction of the battery roll core in the normal direction and penetrates through the center plane of the battery roll core. And the starting section and the tail end of the first positive electrode paste layer and the second positive electrode paste layer are arranged on the same side of a second central shaft of the battery roll core, so that the deformation of the lithium ion battery caused by the deformation of the pole piece in the use process can be prevented.
The utility model discloses a diaphragm can be conventional lithium battery diaphragm, and it contains substrate and coating, and wherein the substrate can be Polyethylene (PE) single layer membrane, polypropylene (PP) single layer membrane or PP/PE/PP three-layer complex film, and the coating can be at least one in porous silica, aluminium oxide, titanium dioxide, the zirconium dioxide. The diaphragm is an insulator of the positive and negative pole pieces, and the diaphragm is arranged between the positive and negative pole pieces, so that the resistance value in short circuit can be increased, the short-circuit current is reduced, and the local heat balance failure is prevented.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A lithium ion battery, comprising: the battery winding core is formed by at least two positive plates, at least two negative plates and a diaphragm;
the at least two positive plates comprise a first positive plate and a second positive plate;
the at least two negative plates comprise a first negative plate and a second negative plate;
the first positive plate, the first negative plate, the second positive plate and the second negative plate are sequentially stacked and then wound into the battery winding core, and at least one diaphragm is arranged between the positive plate and the negative plate.
2. The lithium ion battery of claim 1, wherein the first positive plate comprises a first positive current collector, a first positive paste layer, a second positive paste layer, and a first positive tab;
a first positive electrode paste layer and a second positive electrode paste layer are respectively coated on a first surface and a second surface of the first positive electrode current collector, the coating length of the first positive electrode paste layer is longer than that of the second positive electrode paste layer, the first positive electrode paste layer and the second positive electrode paste layer are coated from a first end of the first positive electrode current collector, the first surface and the second surface are opposite surfaces of the positive electrode current collector, and the first surface is a surface of the positive electrode current collector facing the first negative electrode piece;
the first positive electrode lug is arranged on the first positive electrode current collector.
3. The lithium ion battery of claim 2, wherein the first positive electrode paste layer is coated to a length shorter than the length of the first positive electrode current collector.
4. The lithium ion battery of claim 1, wherein the first negative plate comprises a first negative current collector, a first negative paste layer, a second negative paste layer, and a first negative tab;
wherein, the first negative pole of coating on the relative two sides of the first negative pole mass flow body cream layer of coating respectively and second negative pole coating, the coating length on first negative pole coating is equal to the coating length on second negative pole coating, first negative pole utmost point ear is located on the first negative pole mass flow body.
5. The lithium ion battery of claim 1, further comprising a separator;
the diaphragm comprises a first sub-diaphragm, a second sub-diaphragm, a third sub-diaphragm and a fourth sub-diaphragm;
and the first positive plate, the first sub-diaphragm, the first negative plate, the second sub-diaphragm, the second positive plate, the third sub-diaphragm, the second negative plate and the fourth sub-diaphragm are sequentially stacked and wound into a battery winding core.
6. The lithium ion battery of claim 1, wherein the at least two positive electrode tabs further comprise a third positive electrode tab;
the at least two negative electrode plates further comprise a third negative electrode plate;
and the first positive plate, the first negative plate, the third positive plate, the third negative plate, the second positive plate and the second negative plate are sequentially stacked and then wound into the battery winding core.
7. The lithium ion battery of claim 6, wherein the third positive plate comprises a third positive current collector, a fifth positive paste layer, a sixth positive paste layer, and a third positive tab;
the third positive current collector is provided with a third positive electrode paste layer and a third positive electrode paste layer, wherein the two opposite surfaces of the third positive electrode current collector are respectively coated with the fifth positive electrode paste layer and the sixth positive electrode paste layer, the coating length of the fifth positive electrode paste layer is equal to that of the sixth positive electrode paste layer, and the third positive electrode lug is arranged on the third positive electrode current collector.
8. The lithium ion battery of claim 1, wherein the battery core further comprises at least 4 tabs, and projections of the tabs in a thickness direction of the battery core do not overlap.
9. The lithium ion battery of claim 8, wherein the tab is located on the same side of a first central plane of the battery winding core, and the first central plane of the battery winding core is a plane which has a normal direction parallel to the thickness direction of the battery winding core and passes through the center of the battery winding core.
10. The lithium ion battery of claim 2, wherein the starting end and the ending end of the first positive electrode paste layer and the second positive electrode paste layer are on the same side of a second central plane of the battery roll core, and the second central plane of the battery roll core is a plane which has a normal direction perpendicular to the thickness direction of the battery roll core and passes through the center of the battery roll core.
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| CN202022005613.8U CN212676341U (en) | 2020-09-14 | 2020-09-14 | Lithium ion battery |
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| CN202022005613.8U CN212676341U (en) | 2020-09-14 | 2020-09-14 | Lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113889659A (en) * | 2021-09-30 | 2022-01-04 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113889659A (en) * | 2021-09-30 | 2022-01-04 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
| CN113889659B (en) * | 2021-09-30 | 2023-09-26 | 珠海冠宇电池股份有限公司 | Battery cell |
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