CN112290128A - Multi-winding-core lithium ion battery and battery pack - Google Patents
Multi-winding-core lithium ion battery and battery pack Download PDFInfo
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- CN112290128A CN112290128A CN202011125171.9A CN202011125171A CN112290128A CN 112290128 A CN112290128 A CN 112290128A CN 202011125171 A CN202011125171 A CN 202011125171A CN 112290128 A CN112290128 A CN 112290128A
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- battery
- core
- winding
- lithium ion
- shell
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
Abstract
The invention provides a multi-winding-core lithium ion battery which comprises a shell and a pole core group arranged in the shell, wherein the pole core group comprises N cylindrical winding cores, N is a positive integer and is more than or equal to 2. The pole core group in the multi-winding-core lithium ion battery provided by the invention can reduce the internal resistance of the battery and improve the multiplying power performance if the multi-winding-core lithium ion battery is connected in a parallel mode, and can improve the voltage and the capacity of the battery if the multi-winding-core lithium ion battery is connected in a series mode. The invention also provides a battery pack which comprises a shell and a battery array arranged in the shell, wherein the battery array comprises a plurality of rows of battery packs, and each row of battery packs is formed by arranging and coupling the plurality of rolls of lithium ion batteries through the side surfaces. The battery monomers are mutually supported to play a role in fixing and protecting each other, and the shell encapsulation of the battery monomers adopts frosted texture insulating materials, so that the adjacent shells can generate friction force in the direction perpendicular to the chassis, the battery monomers are prevented from being mutually staggered to damage a battery array, and a stabilizing effect is achieved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a multi-winding-core lithium ion battery and a battery pack.
Background
The current commercial power batteries mainly comprise square batteries, soft package batteries and cylindrical batteries. The square battery and the soft package battery mainly adopt winding and lamination, the laminated battery core has complex manufacturing process, low production efficiency and low yield, and is not suitable for large-scale production; the winding type battery cell is simple to operate and convenient for automatic production, but the winding core has a certain radian in the assembling process, after the winding core is placed into the shell, the winding core and the shell cannot be completely fit, so that more gaps exist, extra electrolyte can be filled in the gaps after liquid injection, and the free electrolyte does not contribute to the capacity at all, but reduces the energy density of the battery cell; the cylinder battery need assemble into battery module with single battery in practical application, and required battery quantity is huge and occupy great space, and battery case has also greatly increased battery weight simultaneously, has hindered battery module energy density's improvement.
In addition, most of the conventional power battery packs are powered by a plurality of battery monomers through peripheral power connectors to form battery modules, and then the battery packs are assembled by the modules. Wherein frame and the structure that the monomer constitutes the module often have certain mechanical strength, can play support, fixed and protection etc. effect to electric core monomer, and the mounting structure who constitutes module and battery package is more, not only can cause the cost to improve, and the whole weight of battery package increases, and mounting structure occupies more space moreover and also can make whole capacity lower, and energy density is lower.
Therefore, in order to solve the above problems, it is an important and urgent task to improve the structural defects of the battery cells and the integration defects of the battery pack, and to increase the overall energy density.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a multi-winding-core lithium ion battery and a battery pack.
The invention provides a multi-winding-core lithium ion battery which comprises a shell and a pole core group arranged in the shell, wherein the pole core group comprises N cylindrical winding cores, N is a positive integer and is more than or equal to 2.
Preferably, the casing is equipped with N and the cavity of cylindric core looks adaptation of rolling up, and N rolls up the core and sets up respectively in N cavities, and N rolls up the core and is the straight line and arranges side by side and arbitrary two adjacent rolls up the core and rely on each other.
Preferably, the N winding cores of the pole core group are connected in parallel or in series.
Preferably, N roll up core and adopt parallel mode to constitute utmost point core group, wherein: the positive current collectors of the N roll cores are connected in sequence, the negative current collectors of the N roll cores are connected in sequence, the positive current collector of one roll core is welded with an aluminum or aluminum alloy tab to form a positive electrode of the battery, and the negative current collector of the other roll core is welded with a nickel or copper-nickel alloy tab to form a negative electrode of the battery.
Preferably, N roll up core and adopt the series system to constitute utmost point core group, wherein: the positive pole mass flow body welding positive lug of 1 st book core forms the positive pole of battery, the negative pole mass flow body of 1 st book core and the positive pole mass flow body welded connection of 2 nd book core, …, the negative pole mass flow body of the (N-1) th book core and the positive pole mass flow body welded connection of the (N) th book core, the negative pole mass flow body welding negative lug of the (N) th book core forms the negative pole of battery.
Preferably, the shell comprises two corrugated connecting shells, the two corrugated connecting shells are oppositely arranged, two ends of each corrugated connecting shell are mutually connected, the number of wave crests of each corrugated connecting shell is N, the wave crests of the two corrugated connecting shells are arranged in a one-to-one correspondence manner, a cylindrical cavity for accommodating a winding core is formed between the two corresponding wave crests, and the inner walls of the corrugated connecting shells are circumferentially and three-dimensionally attached to the side surfaces of the winding cores of the pole core group; preferably, the housing is encapsulated with an insulating material having a frosted texture.
The invention also provides a battery pack which comprises a shell and a battery array arranged in the shell, wherein the battery array comprises a plurality of rows of battery packs, each row of battery packs is formed by arranging and coupling the plurality of winding core lithium ion batteries through the side surfaces, the number of winding cores of the plurality of winding core lithium ion batteries is the same or different, the number of batteries in any two adjacent rows of battery packs is the same, and the end parts of the plurality of batteries in any two adjacent rows of battery packs are correspondingly abutted one by one.
Preferably, the case peaks of the cells of any one row of the battery pack are coupled to the case valleys of the adjacent cells.
Preferably, the housing has a rectangular or square cross-section, wherein: a plurality of sunken first supporting grooves are formed in the first inner wall and the second inner wall of the shell at intervals along the connecting line direction of a plurality of rows of battery packs in the battery array, and the plurality of first supporting grooves in the first inner wall and the second inner wall are respectively arranged in one-to-one correspondence with the plurality of battery packs; in the battery array, batteries at two ends of any battery pack respectively abut against the first inner wall and the second inner wall and are respectively embedded in the two corresponding first supporting grooves.
Preferably, a plurality of sunken second supporting grooves are formed in the third inner wall and the fourth inner wall opposite to the shell at intervals along the connecting line direction of the plurality of batteries in the battery pack; two rows of battery packs positioned at the outer side in the battery array are respectively abutted against the third inner wall and the fourth inner wall, a plurality of battery ends in the two rows of battery packs are respectively embedded in a plurality of second supporting grooves of the third inner wall and the fourth inner wall, and any two adjacent batteries in the battery packs are not embedded in the second supporting grooves at the same time.
According to the multi-winding-core lithium ion battery provided by the invention, the pole core group in the multi-winding-core lithium ion battery can reduce the internal resistance of the battery and improve the multiplying power performance if the multi-winding-core lithium ion battery is connected in a parallel mode, and can improve the voltage and the capacity of the battery if the multi-winding-core lithium ion battery is connected in a series mode; the shell of the multi-winding-core lithium ion battery is perfectly attached to the internal pole core group, so that the redundant space in the shell is reduced, and the energy density reduction caused by the occupation of gaps by redundant electrolyte can be reduced.
The battery pack provided by the invention is characterized in that a plurality of multi-winding-core lithium ion batteries form a battery array, the battery monomers are mutually supported to fix and protect each other, and the shell encapsulation of the battery monomers adopts a frosted insulating material, so that the adjacent shells can generate friction force in the direction vertical to a chassis, the battery monomers are prevented from being mutually staggered to damage the battery array, and a stabilizing effect is achieved; in addition, a plurality of first supporting grooves are formed in the first inner wall and the second inner wall, opposite to the shell, of the shell, and two single batteries at the end part of the battery pack can be stably embedded into the first supporting grooves; the third inner wall that the shell is relative, a plurality of second support grooves have all been seted up to the fourth inner wall, and a plurality of battery tip inlay respectively in two rows of group batteries in the battery array outside support the inslot at a plurality of second, play fixed and supporting role in the direction of being on a parallel with the chamber bottom, and first support groove and second support groove upper portion do not sunken side all can play fixed action to the battery array in the perpendicular to cavity direction, avoid the battery array to break away from the battery package cavity perpendicularly. This multi-reel core lithium ion battery of special construction can directly assemble into in the battery array imbeds the battery package, has saved the frame of module, makes things convenient for the setting of sampling line and walks the line, has simplified the equipment process of follow-up battery package, has reduced the use of material simultaneously, reduce cost has alleviateed weight. In addition, the special structure improves the space utilization rate of the battery pack, realizes modularization removal and improves the integral energy density of the battery pack.
Drawings
Fig. 1 is a schematic structural diagram of a multi-winding-core lithium ion battery provided by the present invention;
fig. 2 is a cross-sectional view of a multi-coiled-core lithium ion battery according to the present invention;
fig. 3 is a schematic structural diagram of a battery pack according to the present invention;
FIG. 4 is an enlarged view of the structure at A in FIG. 3;
FIG. 5 is an enlarged view of the structure at B in FIG. 3;
fig. 6 is a schematic structural diagram of a battery array in a battery pack according to the present invention;
fig. 7 is a schematic structural diagram of a housing in a battery pack according to the present invention.
Detailed Description
Referring to fig. 1 and 2, the invention provides a multi-winding-core lithium ion battery, which comprises a shell 1 and a pole core group arranged in the shell 1, wherein the pole core group comprises N cylindrical winding cores 2, N is a positive integer and N is greater than or equal to 2. The casing 1 is equipped with N and the cavity of 2 looks adaptations of cylindric book core, and N is individual to roll up core 2 and set up respectively in N cavity, and N rolls up core 2 and is the straight line and arranges side by side and arbitrary two adjacent book cores 2 rely on each other.
In this embodiment, the N winding cores 2 of the pole core group are connected in parallel or in series. Specifically, the method comprises the following steps:
when N roll up core 2 and adopt parallel mode to constitute utmost point core group, wherein: the positive current collectors of the N roll cores 2 are connected in sequence, the negative current collectors of the N roll cores 2 are connected in sequence, the positive current collector of one roll core 2 is welded with an aluminum or aluminum alloy tab to form a positive electrode of the battery, and the negative current collector of the other roll core 2 is welded with a nickel or copper-nickel alloy tab to form a negative electrode of the battery.
When N rolls up core 2 and adopts the series system to constitute utmost point core group, the anodal ear of positive pole mass flow welding of 1 st book core 2 forms the positive pole of battery, the negative pole mass flow body of 1 st book core 2 and the anodal mass flow body welded connection of 2 nd book core 2, …, the negative pole mass flow body of the N-1 st book core 2 and the anodal mass flow body welded connection of the N-1 st book core 2, the negative pole mass flow body welded negative ear of the N-1 th book core 2 forms the negative pole of battery.
The pole core group in the multi-winding-core lithium ion battery can reduce the internal resistance of the battery and improve the multiplying power performance if the multi-winding cores 2 are connected in parallel, and can improve the voltage and the capacity of the battery if the multi-winding cores are connected in series.
In a specific embodiment, the housing 1 may be a square aluminum shell or an aluminum-plastic film, and the coating 3 of the housing 1 is made of an insulating material with a frosted texture. Casing 1 includes two corrugate connecting shell, and two corrugate connecting shell mutual interconnect of arranging and two corrugate connecting shell both ends, and the crest quantity of corrugate connecting shell is N and the crest one-to-one setting of two corrugate connecting shell, forms the cylindric cavity that is used for holding book core 2 between two corresponding crests, and the corrugate connecting shell inner wall is laminated with the 2 side circumference three-dimensional of a plurality of book cores of utmost point core group. According to the multi-winding-core lithium ion battery, the shell 1 is perfectly attached to the internal pole-core group, so that redundant space in the shell 1 is reduced, and the energy density reduction caused by the fact that redundant electrolyte occupies gaps can be reduced.
Referring to fig. 3 to 7, the invention further provides a battery pack, which includes a housing 4 and a battery array 5 disposed in the housing 4, wherein the battery array 5 includes a plurality of rows of battery packs, each row of battery pack is formed by a plurality of the above-mentioned multi-winding-core lithium ion batteries through side arrangement and coupling, peaks of a case 1 of the batteries of any one row of battery pack are coupled with troughs of a case 1 of an adjacent battery, winding cores 2 of the plurality of multi-winding-core lithium ion batteries are the same or different in number, the number of the batteries of any two adjacent rows of battery packs is the same, and a plurality of battery ends of any two adjacent rows of battery packs are abutted correspondingly one to one.
The battery pack comprises a battery array 5 formed by a plurality of multi-winding-core lithium ion batteries, the battery monomers are mutually supported to fix and protect each other, and the shell encapsulation 3 of the battery monomers adopts a frosted insulating material, so that the adjacent shells 1 can generate friction force in the direction vertical to the chassis, the battery arrays are prevented from being damaged by mutual dislocation of the battery monomers, and a stabilizing effect is achieved.
In a particular embodiment, the housing 4 has a rectangular or square cross-section, wherein: a plurality of sunken first supporting grooves 6 are formed in the first inner wall and the second inner wall of the shell 4 at intervals along the connecting line direction of the plurality of rows of battery packs in the battery array 5, and the plurality of first supporting grooves 6 of the first inner wall and the second inner wall are respectively arranged in one-to-one correspondence with the plurality of rows of battery packs; in the battery array 5, batteries at two ends of any battery pack respectively abut against the first inner wall and the second inner wall and are embedded in the two corresponding first supporting grooves 6. A plurality of sunken second supporting grooves 7 are formed in the third inner wall and the fourth inner wall of the shell 4 at intervals along the connecting line direction of the plurality of batteries in the battery pack; two rows of battery packs positioned at the outer side in the battery array 5 are respectively abutted against the third inner wall and the fourth inner wall, the end parts of a plurality of batteries in the two rows of battery packs are respectively embedded in a plurality of second supporting grooves 7 of the third inner wall and the fourth inner wall, and any two adjacent batteries in the battery packs are not embedded in the second supporting grooves 7 at the same time. When the battery array 5 is arranged in the shell 4, the first supporting groove 6 and the second supporting groove 7 have the combined action, so that the battery array 5 is not deviated in the direction parallel to the chassis of the shell 4, meanwhile, the non-sunken side surfaces at the upper parts of the first supporting groove 6 and the second supporting groove 7 can also play a role in fixing the battery array 5 in the direction perpendicular to the shell 4, the battery array 5 is prevented from being vertically separated from a battery pack cavity, and the battery pack structure is stable and firm. When the battery array 5 is impacted by external force, the adjacent multi-roll-core lithium ion batteries can be mutually supported by the friction force between the shells 1 in all directions parallel to the chassis, so that the multi-roll-core lithium ion battery monomers of the battery array 5 can not be displaced and dislocated, and the fixing and protecting effects are achieved, and the rubber coating 3 made of the frosted texture outside the multi-roll-core lithium ion battery shell can also be used for fixing and protecting the battery array 5 by the friction force in the direction perpendicular to the chassis.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a many rolls up core lithium ion battery which characterized in that, includes the casing and sets up the utmost point core group in the casing, and utmost point core group is cylindric book core including N, and N is positive integer and N is greater than or equal to 2.
2. The lithium ion battery of claim 1, wherein the housing has N cavities adapted to the cylindrical winding core, the N winding cores are disposed in the N cavities respectively, the N winding cores are arranged side by side in a straight line, and any two adjacent winding cores depend on each other.
3. The multi-winding-core lithium ion battery according to claim 1, wherein the N winding cores of the pole-core group are connected in parallel or in series.
4. The multi-winding-core lithium ion battery according to claim 3, wherein the N winding cores form a pole-core group in a parallel connection mode, wherein: the positive current collectors of the N roll cores are connected in sequence, the negative current collectors of the N roll cores are connected in sequence, the positive current collector of one roll core is welded with an aluminum or aluminum alloy tab to form a positive electrode of the battery, and the negative current collector of the other roll core is welded with a nickel or copper-nickel alloy tab to form a negative electrode of the battery.
5. The multi-winding-core lithium ion battery according to claim 3, wherein the N winding cores form a pole-core group in a serial connection mode, wherein: the positive pole mass flow body welding positive lug of 1 st book core forms the positive pole of battery, the negative pole mass flow body of 1 st book core and the positive pole mass flow body welded connection of 2 nd book core, …, the negative pole mass flow body of the (N-1) th book core and the positive pole mass flow body welded connection of the (N) th book core, the negative pole mass flow body welding negative lug of the (N) th book core forms the negative pole of battery.
6. The multi-winding-core lithium ion battery according to any one of claims 1 to 5, wherein the shell comprises two corrugated connecting shells, the two corrugated connecting shells are oppositely arranged and are mutually connected at two ends, the number of the wave crests of the corrugated connecting shells is N, the wave crests of the two corrugated connecting shells are correspondingly arranged one by one, a cylindrical cavity for accommodating a winding core is formed between the two corresponding wave crests, and the inner wall of each corrugated connecting shell is circumferentially and three-dimensionally attached to the side surfaces of the winding cores of the pole core group; preferably, the housing is encapsulated with an insulating material having a frosted texture.
7. A battery pack is characterized by comprising a shell and a battery array arranged in the shell, wherein the battery array comprises a plurality of rows of battery packs, each row of battery pack is formed by coupling a plurality of multi-roll-core lithium ion batteries according to any one of claims 1 to 6 in a side arrangement mode, the number of winding cores of the plurality of multi-roll-core lithium ion batteries is the same or different, the number of batteries in any two adjacent rows of battery packs is the same, and the end parts of the plurality of batteries in any two adjacent rows of battery packs are abutted in a one-to-one correspondence mode.
8. The battery pack of claim 7, wherein the case peaks of the cells of any one row of the battery pack are coupled to the case valleys of the adjacent cells.
9. The battery pack according to claim 7 or 8, wherein the housing has a rectangular cross section or a square cross section, wherein: a plurality of sunken first supporting grooves are formed in the first inner wall and the second inner wall of the shell at intervals along the connecting line direction of a plurality of rows of battery packs in the battery array, and the plurality of first supporting grooves in the first inner wall and the second inner wall are respectively arranged in one-to-one correspondence with the plurality of battery packs; in the battery array, batteries at two ends of any battery pack respectively abut against the first inner wall and the second inner wall and are respectively embedded in the two corresponding first supporting grooves.
10. The battery pack of claim 9, wherein the third and fourth inner walls of the housing opposite each other are provided with a plurality of recessed second support grooves at intervals along the direction of the connecting lines of the plurality of batteries in the battery pack; two rows of battery packs positioned at the outer side in the battery array are respectively abutted against the third inner wall and the fourth inner wall, a plurality of battery ends in the two rows of battery packs are respectively embedded in a plurality of second supporting grooves of the third inner wall and the fourth inner wall, and any two adjacent batteries in the battery packs are not embedded in the second supporting grooves at the same time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011125171.9A CN112290128A (en) | 2020-10-20 | 2020-10-20 | Multi-winding-core lithium ion battery and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011125171.9A CN112290128A (en) | 2020-10-20 | 2020-10-20 | Multi-winding-core lithium ion battery and battery pack |
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| CN112290128A true CN112290128A (en) | 2021-01-29 |
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| CN202011125171.9A Pending CN112290128A (en) | 2020-10-20 | 2020-10-20 | Multi-winding-core lithium ion battery and battery pack |
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| CN114041232A (en) * | 2021-03-01 | 2022-02-11 | 深圳汝原科技有限公司 | Battery module assembly, battery module and handheld electrical equipment |
| WO2023141797A1 (en) * | 2022-01-26 | 2023-08-03 | 宁德时代新能源科技股份有限公司 | Battery cell and battery |
| CN117497913A (en) * | 2024-01-03 | 2024-02-02 | 深圳市科瑞隆科技有限公司 | Polymer lithium battery pack in low-temperature environment |
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| CN117497913B (en) * | 2024-01-03 | 2024-03-12 | 深圳市科瑞隆科技有限公司 | Polymer lithium battery pack in low-temperature environment |
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