CN110828714A - Shell for lithium ion cell and preparation method thereof, and lithium ion battery - Google Patents
Shell for lithium ion cell and preparation method thereof, and lithium ion battery Download PDFInfo
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- CN110828714A CN110828714A CN201911145770.4A CN201911145770A CN110828714A CN 110828714 A CN110828714 A CN 110828714A CN 201911145770 A CN201911145770 A CN 201911145770A CN 110828714 A CN110828714 A CN 110828714A
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- shell
- lithium ion
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- housing
- ion battery
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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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
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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
- H01M10/0587—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
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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
Abstract
The application provides a shell for a lithium ion cell and a preparation method thereof, the lithium ion cell and the preparation method thereof, and a lithium ion battery. According to the shell for the lithium ion battery cell, the shell prepared by the original stretching process is changed into the shell prepared by bending one plate, so that the universality of production equipment is improved, the use of a die is reduced, the expense of die cost is reduced, and the overall cost of the shell is further reduced; meanwhile, excessive stretching of the shell material in the stretching process can be avoided, so that the strength of the shell is more reliable, and the safety is improved.
Description
Technical Field
The application relates to the field of lithium ion batteries, in particular to a shell for a lithium ion cell and a preparation method thereof, the lithium ion cell and the preparation method thereof, and the lithium ion battery.
Background
In recent years, with the support of the country to the new energy industry, the popularity of new energy automobiles is continuously improved, and the power battery serving as the most important accessory on the new energy automobiles also has great influence on the performance and the cost of the whole automobile. In the classification of power batteries, the power batteries commonly used at present are classified into three categories, namely cylindrical batteries, square batteries and soft package batteries. However, the cost of the power lithium ion battery is high, which becomes a bottleneck restricting the popularization and the promotion of new energy capacity.
At present, in the aspect of the cost ratio of structural accessories of the power lithium ion battery, the cost of a shell is ranked second, and approximately accounts for 30% of the total cost of the structural accessories. The existing aluminum shell processing technology is mainly a stretching technology, the shell mold cost is often expensive due to the requirement of the manufacturing technology, meanwhile, due to the limitation of the stretching technology, certain limitations exist on the processing of large-size shells, long-stretching-distance shells, ultrathin-thickness shells and the like, and meanwhile, the shell cost is difficult to reduce.
Disclosure of Invention
The application aims to solve the technical problem that the shell produced by the existing lithium ion battery cell shell manufacturing process is high in cost.
In order to solve the technical problem, in a first aspect, the application discloses a shell for a lithium ion battery cell, the shell is formed by bending a sheet at least once, and the two ends of the sheet are abutted to form a hollow tubular structure.
Further, the sheet comprises a structural layer and an insulating layer, and the insulating layer is located on the inner wall of the shell.
Further, the insulating layer is a single-layer sub-insulating layer structure or a multi-layer sub-insulating layer composite structure.
Further, the sub-insulating layer is formed by a single insulating material or formed by compounding multiple insulating materials.
Furthermore, two ends of the sheet material which are connected in an abutting mode are respectively provided with a structure for welding connection.
Further, the structure for welding connection is a continuous or discontinuous chamfer, and the two structures for welding connection of the sheets form a welding groove.
Furthermore, the shell is in a square tube shape and comprises three bending parts, and the abutted seams at the two ends of the sheet are positioned at the edges of the shell; or, the casing is square tube shape, the casing includes four portions of bending, the piece at the both ends of sheet butt joint is located on the side of casing.
Furthermore, two abutted ends of the sheets are connected in a welding mode.
In a second aspect, the application discloses a lithium ion battery cell, which comprises a winding core, a positive electrode cover plate, a negative electrode cover plate and the shell;
the winding core is installed in the hollow cylindrical structure, the positive electrode cover plate is connected with one end of the shell in a sealing mode, and the negative electrode cover plate is connected with the other end of the shell in a sealing mode.
Further, the positive cover plate and the shell are subjected to laser sealing welding through a first preset welding track; and/or the negative cover plate and the shell are welded in a laser sealing mode through a second preset welding track.
In a third aspect, the present application discloses a lithium ion battery comprising a lithium ion cell as described above.
In a fourth aspect, the present application discloses a method for preparing a housing for a lithium ion battery cell, comprising:
performing flanging treatment on a pretreated sheet, wherein the flanging treatment comprises flanging the first splicing end of the sheet and/or the second splicing end of the sheet, and forming a flanging part and a base plate part after flanging;
and bending the substrate part according to a preset bending angle, wherein the bending direction is consistent with the flanging direction, and a first bending part and a second bending part are formed after bending.
Further, the pre-processing includes machining structures for welded connection at the first splice end and the second splice end.
Further, the preset bending angle is larger than 90 degrees and smaller than 120 degrees.
Further, the preset bending angle is equal to 90 °.
Further, the preparation method further comprises the step of carrying out laser welding on the sheet after twice bending, and the first splicing end and the second splicing end are provided with structures for welding connection to form welding grooves.
In a fifth aspect, the application discloses a method for preparing a lithium ion battery cell, comprising:
preparing a shell of the lithium ion battery, wherein the shell is prepared by the preparation method of the shell;
a winding core is arranged in the hollow cylindrical structure of the shell;
and assembling and sealing a positive cover plate at one end of the shell, and assembling and sealing a negative cover plate at the other end of the shell.
By adopting the technical scheme, the battery cell shell, the preparation method of the battery cell shell, the lithium ion battery cell, the preparation method of the lithium ion battery cell and the lithium ion battery have the following beneficial effects:
according to the shell for the lithium ion battery cell, the shell prepared by the original stretching process is changed into the shell prepared by bending one plate, so that the universality of production equipment is improved, the use of a die is reduced, the expense of die cost is reduced, and the overall cost of the shell is further reduced; meanwhile, excessive stretching of the shell material in the stretching process can be avoided, so that the strength of the shell is more reliable, and the safety is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a lithium ion battery cell casing according to an embodiment of the present application;
FIG. 2 is a schematic illustration of a shell sheet construction according to one embodiment of the present application;
fig. 3 is a schematic structural diagram of a lithium ion battery cell according to an embodiment of the present application;
FIG. 4 is a flow chart illustrating the preparation of a lithium ion cell housing according to one embodiment of the present application;
FIG. 5 is a flow chart illustrating the preparation of a lithium ion cell housing according to one embodiment of the present application;
fig. 6 is a flow chart illustrating a process for manufacturing a lithium ion battery cell according to another embodiment of the present disclosure;
fig. 7 is a flow chart illustrating a process for manufacturing a lithium ion battery cell according to another embodiment of the present disclosure.
The following is a supplementary description of the drawings:
10-a housing; 11-a first flanging part; 12-a second flanging part; 13-a first bend; 14-a second bend; 15-welding a groove; 101-structural layer; 102-an insulating layer; 20-a winding core; 30-positive cover plate; 40-negative electrode cover plate.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 application.
In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The existing lithium ion battery cell shell 10 is mostly prepared by adopting a stretching process, due to the limitation of the stretching process, certain limitations exist in the processing of a large-size shell 10, a long-stretching-distance shell 10, an ultrathin-thickness shell 10 and the like, and the cost of the shell 10 is difficult to reduce.
As shown in fig. 1 and 2, the present application discloses a housing 10 for a lithium ion battery cell, wherein the housing 10 is formed by bending a sheet at least once, and both ends of the bent sheet abut against each other to form a hollow cylindrical structure.
According to the lithium ion cell shell 10, the original preparation process of the shell 10 is changed from a stretching mode to a bending mode, a set of bending die and equipment can be used for producing different types of shells 10, the expenditure of die cost is reduced, and the overall cost of the shell 10 is reduced; meanwhile, the limitations of the original preparation process of the stretching shell 10 are avoided, the shell 10 with a longer length is made of the shell 10, and meanwhile, the excessive stretching of the material of the shell 10 in the stretching process can be avoided, so that the strength of the shell 10 is more reliable, and the safety is improved.
In the embodiment of the present application, the shape of the housing 10 may be designed according to actual requirements, and optionally, the housing 10 is an encircling type cylindrical structure formed by one-time bending and enclosing of a sheet material, such as a cylinder, a truncated cone, an elliptic cylinder, and the like. In some embodiments, the housing 10 may also be a cylindrical structure formed by bending a sheet material multiple times, such as a square cylinder, a regular or irregular polygonal cylinder, and the like. The hollow cylindrical structure is used for accommodating the winding core 20 of the cell. The sheet material is a thin plate structure, can be a plate made of a single material, and can also be a composite plate made of multiple materials. Optionally, the sheet material is made of metal materials such as aluminum, aluminum alloy, titanium alloy, magnesium alloy, steel sheet and the like; in some embodiments, the material of the sheet material may also be an aluminum-plastic membrane, a carbon fiber plate, a resin composite sheet, an SMC sheet, or the like.
As shown in fig. 2, the sheet includes a structural layer 101 and an insulating layer 102, and the insulating layer 102 is located on the inner wall of the housing 10.
In the embodiment of the application, the sheet material can be of a one-layer structure or a multi-layer composite structure. In some embodiments, to improve the insulating ability inside the housing 10, an insulating coating may be added on the housing 10 sheet. Through the application of the embodiment of the application, the process of adding the insulating coating inside the shell 10 can be completed in a lower-cost and more reliable mode, and the overall safety performance of the lithium ion battery cell is improved.
The insulating layer 102 is a single-layer sub-insulating layer structure or a multi-layer sub-insulating layer composite structure.
In the embodiment of the present application, the insulating layer 102 may be a single insulating layer 102 structure disposed on the surface of the sheet, or may be a composite insulating layer 102 structure disposed on the surface of the sheet. The manner of adding the insulating layer 102 can improve the safety performance of the lithium ion battery cell, and meanwhile, compared with adding the insulating layer 102 inside the molded shell 10, adding the insulating layer 102 on the sheet before processing the shell 10 is more economical and has higher operability.
The sub-insulating layer is formed by a single insulating material or formed by compounding multiple insulating materials.
In the embodiment of the present invention, the insulating layer 102 may be a single insulating material or a composite of multiple insulating materials, and in actual production, the insulating layer can be considered comprehensively according to the process conditions, the cost, and the like.
The two abutted ends of the sheets are respectively provided with a structure for welding connection.
In the embodiment of the application, after the sheet was bent into lithium ion battery cell casing 10, two tip concatenations of sheet were in the same place, and two concatenations are served and are equipped with the structure that is used for welded connection for improve welding quality, avoid the welding seam too outstanding.
The structure for the welded connection is a continuous or discontinuous chamfer, and the two structures for the welded connection of the sheets form a welding groove 15.
In the embodiment of the application, two splicing ends of the shell 10 are provided with the chamfers, the chamfers are arranged on the outer side surface of the shell 10, and the chamfers form the welding groove 15 after the two splicing ends are spliced. Optionally, the chamfers may be intermittently arranged along the splice ends, the splice ends being welded together by multiple spot welds. In some embodiments, a continuous chamfer is provided on the splice end.
The shell 10 is in a square cylinder shape, the shell 10 comprises three bending parts, and the abutted seams of the sheets at two ends are positioned at the edges of the shell 10; or, the casing 10 is in a square cylinder shape, the casing 10 includes four bending portions, and the abutted seams of the sheets at the two ends are located on the side surface of the casing 10.
In the embodiment of the present application, the housing 10 is a rectangular tubular structure, the sheet is bent to form three bending portions, and two ends of the sheet are spliced at an edge of the rectangular tubular structure. In some embodiments, the sheet is bent to form four bent portions, two ends of the sheet are spliced on one side surface of the rectangular cylindrical structure, optionally, the splice is located on the top surface, and the splice bisects the top surface; in some embodiments, the seam can also be located off-center, with the seam located anywhere on the top surface.
The two abutted ends of the sheets are welded and connected.
In the embodiment of the present application, the two ends of the sheet material are spliced together by laser welding, so as to ensure the connection strength of the housing 10.
As shown in fig. 3, the present application discloses a lithium ion battery cell, which includes a winding core 20, a positive electrode cover plate 30, a negative electrode cover plate 40, and the case 10 as described above; the winding core 20 is installed in the hollow cylindrical structure, the positive electrode cover plate 30 is hermetically connected with one end of the case 10, and the negative electrode cover plate 40 is hermetically connected with the other end of the case 10.
In the embodiment of the present application, the lithium ion battery includes a casing 10, and for the specific implementation of the lithium ion battery casing 10, please refer to all the manners of the lithium ion battery casing 10 described above. The lithium ion battery cell further comprises a winding core 20, the winding core 20 is arranged in the hollow cavity of the shell 10, and the shell 10 is sealed by the positive cover plate 30 and the negative cover plate 40. In some embodiments, after the shell 10 is bent and formed according to a preset shape, two splicing ends can be reserved with a certain distance, so that the bent shell 10 is in an open state during assembly, a winding core 20 can enter the shell, the splicing ends are welded together, the process difficulty is reduced, the design size of the winding core 20 can be properly improved, and the energy density of an electric core is increased. According to the embodiment of the application, the bending-formed shell 10 is adopted to replace the stretching-formed shell 10 in the traditional scheme, so that the product performance and the quality are improved, the production cost of the shell 10 can be further reduced, and the total cost of the battery cell is reduced.
The positive electrode cover plate 30 and the shell 10 are welded in a laser sealing mode through a first preset welding track; and/or the negative cover plate 40 and the shell 10 are welded in a laser sealing mode through a second preset welding track.
In the embodiment of the present application, the positive cover plate 30, the negative cover plate 40 and the housing 10 form a closed cavity structure, and the winding core 20 is disposed in the cavity. The positive cover plate 30 is installed and matched with the shell 10, and laser welding is carried out according to the connecting edge of the positive cover plate; the negative electrode cover 40 is fitted to the case 10 and laser welded at its joining edge.
In the embodiment of the application, the shell 10 is bent, the original preparation process of the shell 10 is changed from a stretching mode to a bending mode, and a set of bending die and equipment can be used for producing different types of shells 10, so that the expenditure of die cost is reduced, and the overall cost of the shell 10 is reduced; and can avoid some restrictions of original tensile casing 10 preparation technology, casing 10 makes the casing 10 that length is longer, can avoid the overstretching to casing 10 material in the tensile process simultaneously for casing 10 intensity is more reliable, and the security is promoted. The size limitation of the stretching process to the edges and corners of the shell 10 can be avoided, and smaller edge fillets can be made, so that the size of the winding core 20 can be made larger in the design of the battery cell, and the energy density of the battery is improved.
The application discloses a lithium ion battery, includes the lithium ion battery cell as described above.
In the embodiment of the application, the lithium ion battery cell can avoid the preparation limitation of the stretching process on the thickness of the shell 10 by applying the bent shell 10, can prepare a thinner shell 10, reduces the weight of the lithium ion battery, and improves the energy density of the lithium ion battery.
As shown in fig. 4 and 5, the present application discloses a method for preparing a case 10 for a lithium ion battery cell, including: performing flanging treatment on a pretreated sheet, wherein the flanging treatment comprises flanging the first splicing end of the sheet and/or the second splicing end of the sheet, and forming a flanging part and a base plate part after flanging; and bending the base plate part according to a preset bending angle, wherein the bending direction is consistent with the flanging direction, and a first bending part 13 and a second bending part 14 are formed after bending.
In the present embodiment, the sheet is bent to prepare the square cylindrical housing 10. First, after the sheet is processed according to the required size of the bent housing 10, the first splicing end and the second splicing end of the sheet are turned up by 90 degrees. In some embodiments, the flanging process may also be a flanging process for only one end of the sheet. After the sheet is turned up, the sheet base plate portion, namely the middle area of the turned-up sheet, is bent, two sides of the shell 10 are bent according to a preset bending angle in the bending process, and after the bending, two side faces of the shell 10 and the base plate portion have certain included angles. The bent parts form a first bent part 13 and a second bent part 14, the distance from the first bent part 13 to the first flanging part 11 is equal to the distance from the second bent part 14 to the second flanging part 12, and the distance from the first bent part 13 to the second bent part 14 is equal to the sum of the distance from the first flanging part 11 to the first splicing end and the distance from the second flanging part 12 to the second splicing end; if only one end of the sheet is turned over, taking the first splicing end turned-over edge processing as an example, the distance from the first bending portion 13 to the first turned-over portion 11 after bending is equal to the distance from the second bending portion 14 to the second splicing end, and the distance from the first bending portion 13 to the second bending portion 14 is equal to the distance from the first turned-over portion 11 to the first splicing end.
The bent shell 10 according to the embodiment of the present application can meet the compatibility of the sizes of shells 10 with different specifications by designing and adjusting the sheet and the bending size.
The pre-treatment includes machining structures for welded connections at the first splice end and the second splice end.
In the embodiment of the application, the sheet bending forming process further comprises the step of processing chamfers at two ends of the sheet before the sheet is bent and formed, the first splicing end and the second splicing end are abutted after the sheet is bent and formed, the chamfers arranged on the first splicing end and the second splicing end form the welding groove 15, and when the first splicing end and the second splicing end are welded, the welding groove 15 can reduce the height of a welding seam and improve the welding quality.
The preset bending angle is larger than 90 degrees and smaller than 120 degrees.
In the embodiment of the application, two side faces formed after bending and the base plate portion have preset angles, so that a certain distance is reserved between the two splicing ends, the bending shell 10 is in an open state during assembly, and the winding core 20 can be favorably inserted into the shell.
The preset bending angle is equal to 90 degrees.
In the present embodiment, the sheet material is bent directly to form a closed housing 10 at a predetermined angle of 90 °.
The preparation method further comprises the step of carrying out laser welding on the sheet after twice bending, and the first splicing end and the second splicing end are provided with structures for welding connection to form a welding groove 15.
In the embodiment of the present application, after the sheet is bent to form the housing 10, the first splicing end abuts against the second splicing end, and then the two splicing ends are welded.
As shown in fig. 6 and 7, the present application discloses a method for preparing a lithium ion battery cell, comprising: preparing a shell 10 of lithium ions, the shell 10 being prepared by the above-described method for preparing the shell 10; a winding core 20 is arranged in the hollow cylindrical structure of the shell 10; a positive electrode cover 30 is attached to one end of the case 10 and sealed, and a negative electrode cover 40 is attached to the other end of the case 10 and sealed.
In the embodiment of the application, in the forming process of the shell 10, if the preset angle is not 90 degrees when the shell is bent, namely, a certain distance is reserved between the first splicing end and the second splicing end, at the moment, the shell 10 is in an open state, and the core 20 is conveniently placed into the shell 10. As shown in fig. 6, the winding core 20 is first installed in the bent housing 10 in the direction shown in the drawing, then the housing 10 on both sides is folded to a position of 90 °, then the first and second splicing ends are laser-welded at the position where the welding groove 15 is processed in advance on the butt joint surface of the housing 10, then the positive electrode cover plate 30 and the negative electrode cover plate 40 are installed, and the final laser sealing welding is performed on the laser welding tracks corresponding to the positive electrode cover plate 30 and the negative electrode cover plate 40.
In the embodiment of the present application, in the process of forming the housing 10, if the predetermined angle is 90 ° during bending, the sheet material is directly bent to form a closed housing 10. As shown in fig. 7, the case 10 is directly bent to the state of the case 10 as shown in the drawing, then the laser welding process of the case 10 is completed at the position of the welding groove 15 before the winding core 20 is not installed, then the winding core 20 is directly installed in the case 10 in the cell assembling process, and the final sealing welding is performed on the laser welding track after the positive electrode cover plate 30 and the negative electrode cover plate 40 are installed.
According to the preparation method of the lithium ion battery cell, the original preparation process of the shell 10 is changed from a stretching mode to a bending mode, a set of bending die and equipment can be used for producing different types of shells 10, the expenditure of die cost is reduced, and the overall cost of the shell 10 is reduced; and the limitation of the stretching process on the thickness of the shell 10 can be avoided, a thinner shell 10 can be prepared, the weight of the battery cell is reduced, and the energy density of the battery cell is improved.
It should be appreciated that in the foregoing description of embodiments of the disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of the subject disclosure. Alternatively, various features may be dispersed throughout several embodiments of the application. This is not to be taken as an admission that any of the features of the claims are essential, and it is fully possible for a person skilled in the art to extract some of them as separate embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to less than all features of a single foregoing disclosed embodiment.
In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in certain instances by the term "about", "approximately" or "substantially". For example, "about," "approximately," or "substantially" can mean a ± 20% variation of the value it describes, unless otherwise specified. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.
Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.
Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art may implement the present application in alternative configurations according to the embodiments of the present application. Thus, embodiments of the present application are not limited to those embodiments described with accuracy in the application.
Claims (17)
1. The shell (10) for the lithium ion battery cell is characterized in that the shell (10) is formed by bending a sheet at least once, and two ends of the bent sheet are abutted to enclose a hollow cylindrical structure.
2. The housing (10) of claim 1, wherein the sheet comprises a structural layer (101) and an insulating layer (102), the insulating layer (102) being located on an inner wall of the housing (10).
3. The housing (10) according to claim 2, wherein the insulating layer (102) is a single-layer sub-insulating layer structure or a multi-layer sub-insulating layer composite structure.
4. The housing (10) of claim 3, wherein the sub-insulating layer is formed of a single insulating material or a composite of multiple insulating materials.
5. A housing (10) according to claim 1, characterized in that the abutting ends of the sheets are provided with structures for welded connection, respectively.
6. The housing (10) according to claim 5, wherein the means for welded connection is a continuous or intermittent chamfer, and two of the means for welded connection of the sheets form a welding groove (15).
7. The shell (10) according to claim 1, wherein the shell (10) is in a square cylinder shape, the shell (10) comprises three bending parts, and the abutted seams of the sheets are positioned at the edge of the shell (10); or the like, or, alternatively,
the shell (10) is in a square cylinder shape, the shell (10) comprises four bending parts, and the abutted seams of the two ends of the sheets are located on the side face of the shell (10).
8. A housing (10) according to claim 7, characterized in that the abutting ends of the sheets are welded.
9. A lithium ion battery cell, characterized by comprising a winding core (20), a positive electrode cover plate (30), a negative electrode cover plate (40) and the can (10) of any one of claims 1 to 8;
roll up core (20) install in the cavity tubular structure, positive pole apron (30) with the one end sealing connection of casing (10), negative pole apron (40) with the other end sealing connection of casing (10).
10. The lithium ion battery cell according to claim 9, wherein the positive electrode cover plate (30) and the housing (10) are laser seal welded by a first preset welding track; and/or the negative electrode cover plate (40) and the shell (10) are welded in a laser sealing mode through a second preset welding track.
11. A lithium ion battery comprising the lithium ion battery cell according to any one of claims 9 to 10.
12. A method of making a housing (10) for a lithium-ion cell, comprising:
performing flanging treatment on a pretreated sheet, wherein the flanging treatment comprises flanging the first splicing end of the sheet and/or the second splicing end of the sheet, and forming a flanging part and a base plate part after flanging;
and bending the base plate part according to a preset bending angle, wherein the bending direction is consistent with the flanging direction, and a first bending part (13) and a second bending part (14) are formed after bending.
13. The method of making as set forth in claim 12 wherein the pre-treating includes machining a structure for a welded connection at the first splice end and the second splice end.
14. The method according to claim 13, wherein the predetermined bending angle is greater than 90 ° and less than 120 °.
15. The method according to claim 14, wherein the predetermined bending angle is equal to 90 °.
16. The manufacturing method according to claim 15, further comprising laser welding the sheet after twice bending, wherein the first splicing end and the second splicing end are provided with a structure forming welding groove (15) for welding connection.
17. A preparation method of a lithium ion battery cell is characterized by comprising the following steps:
preparing a housing (10) for a lithium ion battery, the housing (10) being prepared by a method of preparing a housing (10) according to any one of claims 12 to 16;
a winding core (20) is arranged in the hollow cylindrical structure of the shell (10);
and a positive electrode cover plate (30) is assembled and sealed at one end of the shell (10), and a negative electrode cover plate (40) is assembled and sealed at the other end of the shell (10).
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| CN201911145770.4A CN110828714A (en) | 2019-11-20 | 2019-11-20 | Shell for lithium ion cell and preparation method thereof, and lithium ion battery |
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| CN201911145770.4A CN110828714A (en) | 2019-11-20 | 2019-11-20 | Shell for lithium ion cell and preparation method thereof, and lithium ion battery |
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| CN110828714A true CN110828714A (en) | 2020-02-21 |
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