CN111883853A - Parallelly connected assembled many rolls up core lithium cell - Google Patents
Parallelly connected assembled many rolls up core lithium cell Download PDFInfo
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- CN111883853A CN111883853A CN202010720063.XA CN202010720063A CN111883853A CN 111883853 A CN111883853 A CN 111883853A CN 202010720063 A CN202010720063 A CN 202010720063A CN 111883853 A CN111883853 A CN 111883853A
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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
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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
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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
- 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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Abstract
The invention discloses a parallel assembly type multi-winding core lithium battery, which comprises N positive plates, N negative plates, positive lugs and N negative lugs, wherein N positive plates form a layer of positive lamination, every two adjacent positive plates in the layer of positive lamination are mutually connected through the positive lugs, every N negative plates form a layer of negative lamination, every two adjacent negative plates in the layer of negative lamination are mutually connected through the negative lugs, the multiple layers of positive laminations and negative laminations are crossed and superposed to form N winding cores which are mutually connected in parallel, the positive lug and the negative lug between any two adjacent winding cores are respectively and correspondingly connected with a positive post and a negative post on a lithium battery cover plate, and the two adjacent winding cores are mutually folded to form a complete multi-winding core structure. The invention can assemble any number of multi-winding cores, on one hand, the production efficiency and the winding core consistency of the prior laminated battery can be improved, and on the other hand, the problem of the winding core lug folding is solved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a parallel-connection assembled multi-winding-core lithium battery.
Background
With the development of lithium battery technology, high-capacity lithium batteries have become a trend of industry development, and on the basis, various large battery manufacturers have proposed a multi-winding core parallel connection scheme.
Still use two core assemblies of rolling up to give first place to on the existing market, there is following problem mainly: firstly, the scheme is to pair and assemble two single winding cores, and the consistency between the single winding cores is difficult to ensure, so that the service performance of the battery is influenced; the lugs of the single winding core are positioned at the outer side, and the lugs are easy to turn over during carrying and welding operation of the winding core, so that the internal short circuit of the battery is caused; and thirdly, different winding machines or laminating machines are needed to produce the A/B winding cores, so that the difficulty and the risk of manufacturing the battery are high.
Along with the continuous increase of battery capacity, four roll core assembly methods are also gradually popularized, and if the mode of four single roll core assembly is still adopted, the consistency of the battery is further influenced undoubtedly. More importantly, when the number of winding cores is odd, the existing assembly scheme cannot be adapted.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a parallel assembly type multi-winding-core lithium battery, which can be used for assembling any number of multi-winding cores, has good applicability especially to a large-capacity lithium battery, can improve the production efficiency and the winding core consistency of the conventional laminated battery on one hand, and solves the problem of winding core lug folding on the other hand, thereby further improving the battery performance.
The technical scheme of the invention is as follows:
a parallel-assembly type multi-roll-core lithium battery comprises positive plates, negative plates, positive lugs and negative lugs, wherein the number of roll cores is N, N is an integer not less than two, every N positive plates form a layer of positive lamination, every two adjacent positive plates are mutually connected through the positive lugs in the layer of positive lamination, every N negative plates form a layer of negative lamination, every two adjacent negative plates are mutually connected through the negative lugs in the layer of negative lamination, the multilayer positive laminations and the multilayer negative laminations are crossed and superposed to form N roll cores which are mutually connected in parallel, the positive lugs of the multilayer positive laminations are mutually overlapped, the negative lugs of the multilayer negative laminations are mutually overlapped, the positive lugs and the negative lugs are not in contact, the mutually overlapped positive lugs are mutually connected, the mutually overlapped negative lugs are mutually connected, the positive lugs and the negative lugs between any two adjacent roll cores are respectively correspondingly connected with the positive posts and the negative posts on a lithium battery cover plate, and two adjacent roll cores are mutually folded to form a plurality of roll cores into a complete multi-roll core structure, and the pole piece parts of the N roll cores are mutually overlapped.
In the N winding cores which are connected in parallel, each positive tab is connected between the upper parts of two adjacent positive tabs, and each negative tab is connected between the lower parts of two adjacent negative tabs.
In the N winding cores which are connected in parallel, each positive tab is connected between the lower parts of two adjacent positive tabs, and each negative tab is connected between the upper parts of two adjacent negative tabs.
In the N winding cores which are connected in parallel, each positive electrode tab is connected between the lower parts or the upper parts of the two adjacent positive electrode sheets, and each negative electrode tab is connected between the upper parts or the lower parts of the two adjacent negative electrode sheets.
In the N winding cores which are connected in parallel, two end parts of the anode lugs which are overlapped with each other and are adjacent to two adjacent anode sheets are welded with each other, and two end parts of the cathode lugs which are overlapped with each other and are adjacent to two adjacent cathode sheets are welded with each other.
The middle parts of the positive electrode lug and the negative electrode lug between any two adjacent winding cores are respectively and correspondingly connected with the positive electrode post and the negative electrode post on the lithium battery cover plate.
The complete multi-roll core structure is fixed by encapsulation, and an insulating film is coated on the encapsulated multi-roll core structure.
In the complete multi-winding core structure, the lengths of the positive electrode lug and the negative electrode lug between two adjacent winding cores are in direct proportion to the shortest distance between the pole piece parts of the two adjacent winding cores.
The invention has the advantages that:
(1) the positive electrode tab and the negative electrode tab are positioned between the two corresponding adjacent pole pieces, so that the risk that the tabs are easy to turn over in the lamination process is well avoided;
(2) in the process of winding core lamination, the number of times of lamination is reduced, the consistency of the lamination is improved to a certain extent, the manufacturing efficiency is improved, and the method can be well applied to high-capacity batteries;
(3) the invention can carry out parallel assembly on any multi-winding core, and has wide adaptability;
(4) compared with single-roll core assembly, the difference of the roll core is smaller in the manufacturing process, so that the consistency of the lithium battery is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a layer of positive electrode lamination in a parallel assembled double-winding-core lithium battery in embodiment 1 of the invention.
Fig. 2 is a schematic structural diagram of a negative electrode lamination in a parallel assembled double-winding lithium battery in example 1 of the present invention.
Fig. 3 is a schematic structural view of the laminated sheet and the cap plate after being coupled according to embodiment 1 of the present invention.
Fig. 4 is a schematic structural diagram of a parallel assembled double-winding-core lithium battery in embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of three mutually parallel winding cores formed after lamination according to example 2 of the present invention.
Fig. 6 is a schematic structural diagram of a parallel-assembled three-core lithium battery in embodiment 2 of the present invention.
Fig. 7 is a schematic view of a first structure of a positive electrode lamination in a parallel assembly type three-core lithium battery in accordance with embodiment 2 of the present invention.
Fig. 8 is a schematic view of a first structure of a negative electrode stack in a parallel-assembled three-core lithium battery according to embodiment 2 of the present invention.
Fig. 9 is a second structural diagram of a positive electrode lamination in a parallel assembly type three-core lithium battery according to embodiment 2 of the present invention.
Fig. 10 is a schematic diagram of a second structure of a negative electrode stack in a parallel-assembled three-core lithium battery according to embodiment 2 of the present invention.
Fig. 11 is a schematic view of four cores in parallel with each other after lamination in example 3 of the present invention.
Fig. 12 is a schematic structural diagram of a parallel-assembled four-core lithium battery in embodiment 3 of the present invention.
Fig. 13 is a schematic view of a first structure of a positive electrode lamination in a parallel-assembled four-core lithium battery according to embodiment 3 of the present invention.
Fig. 14 is a schematic view of a first structure of a negative electrode stack in a parallel-assembled four-core lithium battery according to embodiment 3 of the present invention.
Fig. 15 is a schematic diagram of a second structure of a positive electrode lamination in a parallel-assembled four-core lithium battery according to embodiment 3 of the present invention.
Fig. 16 is a schematic diagram of a second structure of a negative electrode stack in a parallel-assembled four-core lithium battery according to embodiment 3 of the present invention.
Fig. 17 is a schematic view of a third structure of a positive electrode lamination of a parallel-assembled four-core lithium battery in accordance with embodiment 3 of the present invention.
Fig. 18 is a schematic view of a third structure of a negative electrode stack in a parallel-assembled four-core lithium battery according to example 3 of the present invention.
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.
Example 1
Referring to fig. 1-4, a parallel-assembled double-rolled-core lithium battery comprises two positive plates 11, two negative plates 12, two positive tabs 13 and two negative tabs 14, wherein every two positive plates 11 form a positive lamination (see fig. 1), the two positive plates 11 are connected with each other through the positive tabs 13 in the positive lamination, each positive tab 13 is connected between the upper parts of the two corresponding positive plates 11, every two negative plates 12 form a negative lamination (see fig. 2), the two negative plates 12 are connected with each other through the negative tabs 14 in the negative lamination, each negative tab 14 is connected between the lower parts of the two corresponding negative plates 13, the multiple positive laminations and the multiple negative laminations are overlapped in a crossed manner to form two parallel-connected rolled cores 15, the positive tabs 13 of the multiple positive laminations are overlapped with each other, and the negative tabs 14 of the multiple negative laminations are overlapped with each other, The positive tab 13 and the negative tab 14 are parallel to each other without contact, two end portions of the positive tab 13 adjacent to two adjacent positive plates 11 which are overlapped with each other are welded with each other to form a pre-welding stamp 17, two end portions of the negative tab 14 adjacent to two adjacent negative plates 12 which are overlapped with each other are welded with each other to form a pre-welding stamp 17, the pre-welding stamps 17 achieve the purpose of mutually fixing tabs of each layer of positive lamination or negative lamination, the middle portion of the positive tab 13 between the two winding cores 15 and the middle portion of the negative tab 14 are respectively welded with a positive post and a negative post on a lithium battery cover plate 16 correspondingly to form a final welding stamp 18 (see figure 3), the lengths of all the positive tab 13 and the negative tab 14 are the same, the two winding cores 15 are folded with each other to form a complete double-winding core structure (see figure 4), the pole pieces of the two winding cores 15 are partially overlapped with each other, and the complete, and an insulating film is coated on the encapsulated three-roll core structure, so that the risk of short circuit between the roll core and the aluminum shell is avoided.
Example 2
Referring to fig. 6-10, a parallel-assembled three-core lithium battery includes three positive plates 21, three negative plates 22, three positive tabs 23 and three negative tabs 24, where each three positive plates 21 form a positive lamination, each two adjacent positive plates 21 in a positive lamination are connected to each other through the positive tabs 23, each three negative plates 22 form a negative lamination, each two adjacent negative plates 22 in a negative lamination are connected to each other through the negative tabs 24, the multiple positive laminations and the multiple negative laminations are stacked in a cross manner to form three parallel winding cores 25, the positive tabs 23 of the multiple positive laminations are overlapped with each other, the negative tabs 24 of the multiple negative laminations are overlapped with each other, the positive tabs 23 and the negative tabs 24 are parallel to each other without contact, two end portions of the overlapped positive tabs 23 adjacent to the two adjacent positive plates 21 are welded to each other, two end portions of the overlapped negative tabs 24 adjacent to the two adjacent negative plates 22 are welded to each other, the middle parts of a positive lug 23 and a negative lug 24 between a first roll core and a second roll core are respectively and correspondingly connected with a positive post and a negative post on a lithium battery cover plate 26, the first roll core and an adjacent second roll core are mutually folded, the second roll core and an adjacent third roll core are mutually folded, so that the three roll cores form a complete three-roll-core structure, the pole piece parts of the three roll cores 25 are mutually overlapped, the third roll core is arranged between the first roll core and the second roll core in an overlapping way, the length of the positive lug and the negative lug between the second roll core and the third roll core is less than that of the positive lug and the negative lug between the first roll core and the second roll core, thereby ensuring that the bending degrees of the positive lug and the negative lug are consistent after the roll cores are folded, the complete three-roll-core structure is fixed by encapsulation, and an insulating film is coated on the encapsulated three-roll-core structure, avoid having the risk of short circuit between core and the aluminum hull.
In the three winding cores connected in parallel, each positive tab 23 is connected between the lower portions of two adjacent positive tabs 21, each negative tab 24 is connected between the upper portions of two adjacent negative tabs 22 (see fig. 7 and 8), or the positive tab 23 located between the first winding core and the second winding core is connected between the lower portions of two adjacent positive tabs 21, the positive tab 23 located between the second winding core and the third winding core is connected between the upper portions of two adjacent positive tabs 21, the negative tab 24 located between the first winding core and the second winding core is connected between the upper portions of two adjacent negative tabs 22, the negative tab 24 located between the second winding core and the third winding core is connected between the lower portions of two adjacent negative tabs 22 (see fig. 9 and 10), and the requirements that the positive tabs 23 of the multilayer positive lamination are overlapped, the negative tabs 24 of the multilayer negative lamination are overlapped with each other, and the negative tabs are overlapped with each, Positive tab 23 and negative tab 24 are parallel to each other without contact.
Example 3
Referring to fig. 11-18, a parallel-assembled four-core lithium battery includes four positive plates 31, four negative plates 32, four positive tabs 33 and four negative tabs 34, where each four positive plates 31 form a positive lamination, each two adjacent positive plates 31 in the positive lamination are connected to each other via the positive tabs 33, each four negative plates 32 form a negative lamination, each two adjacent negative plates 32 in the negative lamination are connected to each other via the negative tabs 34, the positive laminations and the negative laminations are stacked in a cross manner to form four winding cores 35 connected in parallel, the positive tabs 33 of the positive laminations are overlapped with each other, the negative tabs 34 of the negative laminations are overlapped with each other, the positive tabs 33 and the negative tabs 34 are parallel without contact, two end portions of the positive tabs 33 that are overlapped with each other and adjacent two positive plates 31 are welded to each other, and two end portions of the negative tabs 34 that are overlapped with each other and adjacent two negative tabs 32 are welded to each other, the middle parts of the anode tab 33 and the cathode tab 34 between the four winding cores 35 and the second winding core and the third winding core are respectively and correspondingly connected with the anode post and the cathode post on the lithium battery cover plate 36, the first winding core and the adjacent second winding core are mutually folded, the second winding core and the adjacent third winding core are mutually folded, and the third winding core and the adjacent fourth winding core are mutually folded to form a complete four-winding core structure, the pole piece parts of the four winding cores 35 are mutually overlapped, the second winding core is overlapped between the first winding core and the third winding core, the third winding core is overlapped between the second winding core and the fourth winding core, the lengths of all the anode lugs and the cathode lugs are the same, the complete four winding core structure is fixed by encapsulation, and the insulating film is coated on the encapsulated four-roll core structure, so that the risk of short circuit between the roll core and the aluminum shell is avoided.
Among the four winding cores connected in parallel, each positive tab 33 is connected between the lower portions of two adjacent positive tabs 31, each negative tab 34 is connected between the upper portions of two adjacent negative tabs 32 (see fig. 13 and 14), or the positive tab 33 between the first winding core and the second winding core is connected between the upper portions of two adjacent positive tabs 31, the positive tab 33 between the second winding core and the third winding core is connected between the lower portions of two adjacent positive tabs 31, the positive tab 33 between the third winding core and the fourth winding core is connected between the upper portions of two adjacent positive tabs 31, the negative tab 34 between the first winding core and the second winding core is connected between the lower portions of two adjacent negative tabs 32, and the negative tab 34 between the second winding core and the third winding core is connected between the upper portions of two adjacent negative tabs 32, The negative tab 34 between the third winding core and the fourth winding core is connected between the lower parts of the two adjacent negative plates 32 (see fig. 15 and 16), or the positive tab 33 between the first winding core and the second winding core is connected between the upper parts of the two adjacent positive plates 31, the positive tab 33 between the second winding core and the third winding core is connected between the lower parts of the two adjacent positive plates 31, the positive tab 33 between the third winding core and the fourth winding core is connected between the lower parts of the two adjacent positive plates 31, the negative tab 34 between the first winding core and the second winding core is connected between the lower parts of the two adjacent negative plates 32, the negative tab 34 between the second winding core and the third winding core is connected between the upper parts of the two adjacent negative plates 32, and the negative tab 34 between the third winding core and the fourth winding core is connected between the upper parts of the two adjacent negative plates 32 (see fig. 17 and 18), and the positive electrode tabs 33 of the multilayer positive electrode lamination are mutually overlapped, the negative electrode tabs 34 of the multilayer negative electrode lamination are mutually overlapped, and the positive electrode tabs 33 and the negative electrode tabs 34 are mutually parallel and have no contact.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a many rolls of core lithium cell of parallelly connected assembled which characterized in that: the lithium battery comprises positive plates, negative plates, positive lugs and negative lugs, wherein the number of the winding cores is N, N is an integer not less than two, every N positive plates form a layer of positive lamination, every two adjacent positive plates are connected with each other through the positive lugs in the layer of positive lamination, every N negative plates form a layer of negative lamination, every two adjacent negative plates are connected with each other through the negative lugs in the layer of negative lamination, the multilayer positive lamination and the multilayer negative lamination are crossed and superposed to form N winding cores which are connected in parallel, the positive lugs of the multilayer positive lamination are mutually superposed, the negative lugs of the multilayer negative lamination are mutually superposed, the positive lugs and the negative lugs are not in contact, the mutually superposed positive lugs are mutually connected, the mutually superposed negative lugs are mutually connected, the positive lug and the negative lug between any two adjacent winding cores are respectively and correspondingly connected with a positive pole and a negative pole on a lithium battery cover plate, and two adjacent roll cores are mutually folded to form a plurality of roll cores into a complete multi-roll core structure, and the pole piece parts of the N roll cores are mutually overlapped.
2. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: in the N winding cores which are connected in parallel, each positive tab is connected between the upper parts of two adjacent positive tabs, and each negative tab is connected between the lower parts of two adjacent negative tabs.
3. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: in the N winding cores which are connected in parallel, each positive tab is connected between the lower parts of two adjacent positive tabs, and each negative tab is connected between the upper parts of two adjacent negative tabs.
4. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: in the N winding cores which are connected in parallel, each positive electrode tab is connected between the lower parts or the upper parts of the two adjacent positive electrode sheets, and each negative electrode tab is connected between the upper parts or the lower parts of the two adjacent negative electrode sheets.
5. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: in the N winding cores which are connected in parallel, two end parts of the anode lugs which are overlapped with each other and are adjacent to two adjacent anode sheets are welded with each other, and two end parts of the cathode lugs which are overlapped with each other and are adjacent to two adjacent cathode sheets are welded with each other.
6. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: the middle parts of the positive electrode lug and the negative electrode lug between any two adjacent winding cores are respectively and correspondingly connected with the positive electrode post and the negative electrode post on the lithium battery cover plate.
7. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: the complete multi-roll core structure is fixed by encapsulation, and an insulating film is coated on the encapsulated multi-roll core structure.
8. The parallel assembled lithium battery with multiple rolled cores as claimed in claim 1, wherein: in the complete multi-winding core structure, the lengths of the positive electrode lug and the negative electrode lug between two adjacent winding cores are in direct proportion to the shortest distance between the pole piece parts of the two adjacent winding cores.
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| CN202010720063.XA CN111883853A (en) | 2020-07-24 | 2020-07-24 | Parallelly connected assembled many rolls up core lithium cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113644357A (en) * | 2021-08-02 | 2021-11-12 | 合肥国轩高科动力能源有限公司 | Battery based on parallel connection of multiple winding cores and assembly method thereof |
| CN115101897A (en) * | 2021-03-05 | 2022-09-23 | 本田技研工业株式会社 | Battery module |
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| CN209747660U (en) * | 2019-02-28 | 2019-12-06 | 蜂巢能源科技有限公司 | Laminated battery roll core structure and lithium ion battery |
| CN111180782A (en) * | 2019-12-31 | 2020-05-19 | 江苏春兰清洁能源研究院有限公司 | Method for manufacturing secondary battery by adopting double-core-cladding lamination and integral riveting |
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| CN209747660U (en) * | 2019-02-28 | 2019-12-06 | 蜂巢能源科技有限公司 | Laminated battery roll core structure and lithium ion battery |
| CN110247123A (en) * | 2019-06-17 | 2019-09-17 | 合肥国轩高科动力能源有限公司 | A kind of core strueture, manufacturing method and battery |
| CN111180782A (en) * | 2019-12-31 | 2020-05-19 | 江苏春兰清洁能源研究院有限公司 | Method for manufacturing secondary battery by adopting double-core-cladding lamination and integral riveting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115101897A (en) * | 2021-03-05 | 2022-09-23 | 本田技研工业株式会社 | Battery module |
| CN115101897B (en) * | 2021-03-05 | 2024-05-24 | 本田技研工业株式会社 | Battery Module |
| CN113644357A (en) * | 2021-08-02 | 2021-11-12 | 合肥国轩高科动力能源有限公司 | Battery based on parallel connection of multiple winding cores and assembly method thereof |
| CN113644357B (en) * | 2021-08-02 | 2023-07-21 | 合肥国轩高科动力能源有限公司 | Battery based on multi-coil core parallel connection and assembly method thereof |
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