CN114142132A - Packaging structure of cylindrical battery, battery pack and manufacturing method of cylindrical battery - Google Patents
Packaging structure of cylindrical battery, battery pack and manufacturing method of cylindrical battery Download PDFInfo
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- CN114142132A CN114142132A CN202111294936.6A CN202111294936A CN114142132A CN 114142132 A CN114142132 A CN 114142132A CN 202111294936 A CN202111294936 A CN 202111294936A CN 114142132 A CN114142132 A CN 114142132A
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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
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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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
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
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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
- H01M50/30—Arrangements for facilitating escape of gases
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
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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
Abstract
The invention relates to a cylindrical battery packaging structure, a cylindrical battery, a battery pack and a manufacturing method thereof. The package structure includes: a cylindrical housing having an open end; the composite top cover comprises a top cover body and a switching piece; the top cover body is a conductor, is arranged at the opening end of the cylindrical shell and can close the opening end; the adapter sheet is provided with a bending part, and the two ends of the bending part are respectively a connecting part and an extending part of the adapter sheet; the connecting part is electrically connected with the top cover body; the extension part is arranged close to the side shell of the cylindrical shell and is not electrically connected with the cylindrical shell; the outer side of the extension part is used for being electrically connected with the shell pole of other cylindrical batteries. According to the packaging structure and the cylindrical battery, the top pole is laterally arranged, the problem that high electric flux of the top pole of the battery is connected to the public top bus bar and the problem that the top public bus bar expands current-carrying capacity without increasing the height of the top of the battery are solved, and meanwhile, the grouping or unpacking efficiency is greatly improved and the cost is reduced.
Description
Technical Field
The invention relates to the field of new energy power batteries, in particular to a cylindrical battery packaging structure, a cylindrical battery, a battery pack and a manufacturing method of the cylindrical battery.
Background
The area of the cylindrical battery shell pole is far larger than that of the top pole and is limited by the diameter of the top, and the width of a top bus bar between the top poles is far smaller than that of a bus bar arranged between the shell poles. Under the conditions of increasing the capacity of single batteries and increasing the total capacity of parallel batteries, a traditional grouping mode of electrically connecting each top pole column by a top public bus bar is adopted, high requirements are provided for current carrying capacity from the top pole column to a drainage branch of the public bus bar and the current carrying capacity of the public bus bar, and the sectional area of the top public bus bar becomes the bottleneck of current carrying. Also, the thermal welding process has a limit to the thickness of the thermally fused adjacent metal, and in the case where the increase in the thickness of the bus bar is limited, it is urgently required to increase the width of the bus bar.
In addition, the grouping application field of the vehicle-mounted power battery pack of the pure electric vehicle is developing towards the CTP (CELL TO PACK) technology direction with high energy density and integral quick grouping (packaging). The cell size of industry standard cylindrical power cells is expanding from 21700 (diameter 21mm, height 70mm) to 46800 (diameter 46mm, height 80 mm). Grouping application of large-monomer cylindrical batteries, particularly 4680 novel batteries, CTP and CTC are important technical directions. The convenience and the reliability of various electric connection operations in the grouping process from the single batteries to the battery pack are improved, and the key problems which are important to solve by the CTP technology are solved; the key problems of important solution of the CTC technology are that the arrangement of functional components outside the grouped battery packs is reduced or optimized, and the stability of the battery packs as chassis structural members is enhanced.
Disclosure of Invention
In order to solve the above problems in the prior art, an aspect of the present invention provides a cylindrical battery package structure, including: a cylindrical housing having an open end; the composite top cover comprises a top cover body and a switching piece; the top cover body is a conductor, is arranged at the opening end of the cylindrical shell and can close the opening end;
the adapter sheet is a conductor and is provided with a bending part, and the two ends of the bending part are respectively a connecting part and an extending part of the adapter sheet; the connecting part is electrically connected with the top cover body; the inner side of the extension part is arranged close to the side shell of the cylindrical shell and is not electrically connected with the cylindrical shell; the outer side of the extension part is used for being electrically connected with the shell pole of other cylindrical batteries.
As a preferred technical scheme, the top cover body is provided with a pressure relief part; the pressure relief portion is arranged in the center of the top cover body, or the pressure relief portion is arranged in a non-central position of the top cover body.
As a preferred technical scheme, the connecting part faces one side of the top cover body and is provided with an annular electric connection structure, and the annular electric connection structure is used for electrically connecting the top cover body with the adapter plate.
Preferably, the annular electrical connection structure is a crown structure.
As a preferred technical scheme, the connecting part and the annular electric connecting structure are integrally formed, and the annular electric connecting structure and the top cover body are connected by adopting a hot welding or cold welding process.
As a preferred technical scheme, the connecting part, the annular electric connecting structure and the top cover body are integrally formed.
Preferably, at least partial area of the inner side of the extension part and/or at least partial area of the inner side of the connecting part are provided with insulating layers; the insulating layer is used for insulating the adapter plate and the cylindrical shell.
Preferably, at least a partial area of the inner side of the extension part is covered with a hard insulating layer, and the hard insulating layer is double-sided adhesive tape.
Preferably, the connecting part has a pressure relief hole corresponding to the pressure relief part.
Preferably, the outer side connecting surface of the extension part is a plane.
Preferably, the outer side connecting surface of the extension part is a cylindrical surface, and the cylindrical surface is configured to be capable of being attached to a housing pole of an adjacent single cylindrical battery.
The invention provides a cylindrical battery, a packaging structure for packaging any one of the cylindrical batteries and an electric core component;
the electric core assembly is arranged in a closed space enclosed by the cylindrical shell and the top cover body;
the top utmost point post and the top cap body and/or the connecting portion electricity of electricity core subassembly are connected, and the casing utmost point post and the cylindrical casing electricity of electricity core subassembly are connected, and insulating sealing connection between the periphery of top cap body and the cylindrical casing.
In another aspect, the present invention provides a serial battery row, comprising a plurality of the above cylindrical batteries; a plurality of cylindrical batteries are arranged in proper order, and the extension of arranging first cylindrical battery is as the external top utmost point post of battery row, and the extension of other cylindrical batteries is connected with the side casing electricity of the cylindrical casing of preceding cylindrical battery in proper order in the battery row, and the cylindrical casing of arranging last cylindrical battery can regard as the external casing utmost point post of battery row.
Preferably, the plurality of cylindrical batteries are arranged in a straight line, a broken line or a curve.
Preferably, the battery pack further comprises an access bridge electrically connected to the cylindrical housing of the row of end cylindrical batteries, and the access bridge can serve as an external housing pole of the battery row.
Preferably, a bridge structure and/or a cold welding structure and/or a structural adhesive bonding structure are/is arranged between the extension part and the side shell of the cylindrical shell.
Yet another aspect of the present invention provides a battery pack including:
a plurality of staggered battery rows, each battery row being formed by a plurality of the aforementioned cylindrical battery arrangements; the cylindrical shells of the adjacent cylindrical batteries in the same battery row are electrically connected; the extension parts of all the cylindrical batteries in each battery row are positioned at the same side of the battery row and face the side shell of the cylindrical shell of the adjacent battery row; the extension parts of all the cylindrical batteries in each battery row are electrically connected with the side shell of the adjacent cylindrical shell of the next battery row in sequence; all cylindrical batteries of each battery row are of parallel connection structures, and a plurality of battery rows are of series connection structures.
As a preferred technical scheme, at least one end of each battery row is provided with a transfer bridge; the thickness of the transfer bridge is approximately equal to that as a preferred solution, the extension of all cylindrical cells in each cell row faces in the direction of the same included angle in which the cell rows run.
Preferably, the extension part and the side shell of the corresponding cylindrical shell of the adjacent battery row and the side shell of the adjacent cylindrical shell in the battery row are provided with an electric bridge structure and/or a cold welding structure and/or a structural adhesive sealing structure.
The preferable technical scheme comprises an external top pole converging part which is electrically connected with the extending parts of all cylindrical batteries of the first battery row; or, including external top utmost point post structure of converging, external top utmost point post structure of converging includes a plurality of external top utmost point post portions of converging, and external top utmost point post portion of converging is connected with the extension electricity of the partial cylindrical battery of first battery row respectively.
As a preferred technical scheme, the extension parts of all cylindrical batteries in the first battery row face to the direction perpendicular to the trend of the battery row, and the external top pole bus part is attached to and electrically connected with the extension parts.
The preferable technical scheme includes that the battery pack comprises an outer shell pole converging part which is electrically connected with cylindrical shells of all cylindrical batteries of a last battery row; or, including outer casing utmost point post structure of converging, outer casing utmost point post structure of converging includes a plurality ofly to outer casing utmost point post portion of converging, and outer casing utmost point post portion of converging is connected with the cylindrical casing electricity of the partial cylindrical battery of last battery row respectively.
In still another aspect, the present invention provides a method of manufacturing the aforementioned battery pack, including:
the cylindrical batteries are arranged in a row in the single-row jig, and the direction of the adapter sheet of each cylindrical battery is adjusted to be consistent according to the direction of the adapter sheet of the cylindrical battery;
cold welding structures are clamped between cylindrical shells of adjacent cylindrical batteries in the battery row, and the two sides of the cold welding structures are pressed tightly to form a linearly arranged battery row with a fixed length, wherein the cylindrical shells of all the cylindrical batteries in the battery row are connected in parallel;
preparing a plurality of battery rows;
the battery rows are arranged in the whole jig in a staggered mode, the cold welding structure is clamped between the cylindrical shell and the extending portion of the adjacent battery rows, the battery rows are compressed along the inter-row direction, the cylindrical shell corresponding to the cylindrical batteries between the adjacent battery rows is electrically connected with the extending portion, and the battery pack connected in series between the adjacent battery rows is obtained.
The technical scheme can achieve the following beneficial effects: through the top cap body, connecting portion, the electric connection of extension, put cylindrical battery's top utmost point post side, make things convenient for this top utmost point post to be connected electrically to the side casing utmost point post of adjacent battery, and simultaneously, merge the public top busbar of single battery row to the public casing utmost point post busbar of the adjacent battery row of establishing ties on (the side is put, the sharing), the problem of the public top busbar of high electric flux increase current-carrying sectional area and the public busbar in top enlarge the current-carrying capacity and do not increase the problem of battery top height has been solved, cylindrical battery's in bank and group technology have still been simplified greatly.
Meanwhile, in the grouping process, both series-parallel connection electric connection and integral structure solid sealing can be realized through an integral one-time packing (cold welding glue) compression joint electric connection and integral point structure glue rapid photocuring full gluing process, so that the grouping efficiency is greatly improved, and the cost is reduced; the recovered battery pack of the full-adhesive process can be disassembled into the single batteries and the corresponding components with completely undamaged surfaces by a chemical disassembly method, so that the disassembly and assembly cost is greatly reduced, the reutilization rate of the recovered batteries and the components is improved, and social resources are saved.
In addition, the upper end and the lower end of the battery pack are not provided with structures of additional public bus bars, so that the influence of external longitudinal pressure on the electric connection and the structural strength of the public bus bars of the battery pack is reduced, and the structural integration strength of the battery pack and the whole vehicle chassis is enhanced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:
fig. 1 is a schematic view of a cylindrical battery package structure disclosed in embodiment 1 of the present invention;
fig. 2 is a schematic view of a cylindrical battery package structure disclosed in embodiment 1 of the present invention;
fig. 3 is a schematic view of a cylindrical battery package structure disclosed in embodiment 1 of the present invention;
fig. 4 is a schematic view of a cylindrical battery package structure disclosed in embodiment 1 of the present invention;
fig. 5 is a schematic view of a cylindrical battery package structure disclosed in embodiment 1 of the present invention;
fig. 6 is a schematic view of a cylindrical battery package structure disclosed in embodiment 1 of the present invention;
fig. 7 is a schematic structural view of a series battery row disclosed in embodiment 3 of the present invention;
fig. 8 is a schematic structural view of a battery pack disclosed in embodiment 4 of the present invention;
fig. 9 is a schematic structural view of a battery pack disclosed in embodiment 4 of the invention;
fig. 10 is a schematic structural view of a battery pack disclosed in embodiment 4 of the invention;
fig. 11 is a schematic structural view of a battery pack disclosed in embodiment 4 of the present invention.
Description of reference numerals:
a composite top cover 10; a top cover body 11; a pressure relief portion 111; an insulating pad 112; a connecting portion 12; a pressure relief hole 121; an annular electrical connection structure 122; an extension 13; an insulating layer 14;
a cylindrical housing 20;
a transfer bridge 30;
an approach bridge 40;
a first electrical connection portion 50;
the second electrical connection portion 60;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
To solve the problems of the prior art, the present embodiment provides, in part, a cylindrical battery package structure, a cylindrical battery, a battery pack, and a method of manufacturing the same.
The structure of a conventional top cover and a pressure release valve is converted into an integrated structure of the top cover, the pressure release valve and an adapter plate, a new battery packaging structure with a laterally arranged top pole is formed, and a new cylindrical battery structure and a battery pack grouping structure and mode based on the packaging structure are further provided.
Example 1
According to fig. 1 to 6, the present example 1 provides a cylindrical battery packaging structure including:
a cylindrical housing 20 having an open end; the open end is circular and corresponds to the position of the top terminal of the cylindrical battery, and the open end is also taken as the top of the cylindrical battery in the embodiment. The bottom of the cylindrical cell is a closed end.
In contrast to the existing cylindrical battery top cover, the composite top cover 10 shown in fig. 3-4 is adopted in the present embodiment 1, and the composite top cover 10 includes a top cover body 11 and an adaptor sheet.
The top cover body 11 is made of a conductor material, preferably in a disc shape, and is arranged at the open end of the cylindrical shell 20, the shape of the open end is matched with that of the open end, and the open end can be closed; preferably, an insulating pad 112 is further disposed around the top cap body 11 for insulating, sealing, fixing and limiting.
The composite top cap 10 structure also has an adaptor sheet, preferably in the form of a strip. The adapter sheet has a bending part, two ends of the bending part are respectively a connecting part 12 and an extending part 13 of the adapter sheet, and the bending angle is preferably 90 degrees, namely the connecting part 12 and the extending part 13 are approximately vertical. According to fig. 4, the connection portion 12 is electrically connected to the top cover body 11.
The extension 13 is disposed adjacent to the side housing of the cylindrical housing 20 and is not electrically connected to the cylindrical housing 20; the outside of the extension part 13 is used for being electrically connected with the shell pole of other cylindrical batteries.
In this embodiment 1, the top terminal of the cylindrical battery is laterally arranged through the electrical connection relationship among the top cap body 11, the connecting portion 12 and the extending portion 13. The composite top cover 10 structure can be completed before the grouping assembly process of the cylindrical batteries, i.e. the cylindrical batteries prepared by the packaging structure of the embodiment 1 have the top terminal posts arranged laterally after the batteries are manufactured, which provides great convenience for the grouping and row arrangement of the cylindrical batteries.
Preferably, the cap body 11 has a relief portion 111. Preferably, the relief portion 111 is provided at the center of the top cover body 11. The package structure of embodiment 1 can retain the pressure relief portion 111 and the upper pressure relief hole 121 formed on the battery top cover. Preferably, the relief portion 111 is a cross-shaped slot.
In another preferred embodiment, the pressure relief portion 111 may be disposed at a non-central position of the top cover body 11.
In the present embodiment, the number of the pressure relief portions 111 may be plural. Preferably, the pressure relief portion 111 is a local thinning region of the top cover body 11, such as a local linear groove, a local circular groove, or the like, and may also be an independent pressure relief component.
Preferably, a pressure relief opening is arranged above the pressure relief portion, and the pressure relief opening comprises a cylindrical pressure relief channel side wall and an upper end portion. Preferably, the upper end part is open, the opening is an upward pressure relief opening, or the upper end part is a cover plate sealed with the side wall of the pressure relief channel, the side wall of the pressure relief channel is provided with an opening, and the opening is a lateral pressure relief opening; the pressure relief opening is a conductor and is electrically connected with the top cover body. Preferably, the side wall of the pressure relief channel has a certain thickness, and has a larger electric flux as an electric connection part between the cover plate and the top cover body 11.
Preferably, the connecting portion 12 has an annular electrical connection structure 122 on a side facing the top cover body 11, and the annular electrical connection structure 122 electrically connects the top cover body 11 with the interposer. Preferably, the annular electrical connection structure 122 is a crown structure, which is preferably formed by punching and flanging the surface of the connection portion 12 by a flanging process and simultaneously manufacturing the pressure relief hole 121, as shown in the cross-sectional structure of fig. 4. Even if the surface of the connecting part 12 is provided with the pressure relief hole 121, the electric flux of the connecting part 12 passing through the area of the pressure relief hole 121 is not influenced.
Preferably, the crown structure can be understood as a downward flanging of the connecting part 12 at the position of the pressure relief hole 121, the lower end of the downward flanging is provided with a plurality of shallow notches, and the lower end of the downward flanging is subjected to expansion fracture to form a ring-shaped power connection claw, and the power connection claw is preferably bent outwards. The lower flanging of the crown wearing structure is a side wall of the pressure relief channel, and the hollow part of the crown wearing structure is an upward pressure relief opening. It should be understood by those skilled in the art that the annular power connection claw can significantly increase the power connection area between the connection portion 12 and the top cover body, and is more suitable for 4680 battery with high energy density.
While the interposer prepared by this process has the connecting portion 12 integrally formed with the annular electrical connection structure 122, it should be understood by those skilled in the art that the stamping process may be replaced by casting or the like, so as to obtain an integrally formed interposer and make the electrical connection more reliable.
Preferably, the annular electrical connection structure 122 is connected to the top cover body 11 by a hot welding or cold welding process.
As a preferred embodiment, a joining process in which the thermal welding is metal welding or filler metal welding, including one or more of spot welding, laser welding, ultrasonic welding, and argon arc welding, is often used to make the electrical connection of the composite top cap 10. Since the process of preparing the composite top cap 10 is performed before the cylindrical battery is manufactured, the use of the thermal welding process does not have any negative effects on the thermal stability of the cylindrical battery manufactured by the subsequent processes.
As a preferred embodiment, the cold welding process is to apply cold welding glue between the annular electrical connection structure 122 and the top cover body 11 to achieve stable electrical connection between the annular electrical connection structure and the top cover body, and is mostly used for electrical connection between the top cover of the complete battery and the interposer, the cold welding glue is preferably a conductive glue capable of being cured at normal temperature, and forms electrical connection by downward crimping of a connection portion, and after being pressed, the cold welding glue fills up a non-contact point at the pressed portion and overflows to a non-pressed outer surface seam, so that the electrical connection area is greatly increased.
In another preferred embodiment, the connecting portion 12 is integrally formed with the annular electrical connecting structure 122 and the top cover body 11, such as by a casting process to manufacture the composite top cover 10.
In a further preferred embodiment, at least a partial region of the connecting portion is flush with and electrically connected to the top cover body. Preferably, at least a partial region of the connecting portion 12 is integrally formed with the top cover body 11 to provide better electrical connection capability and higher structural strength. Preferably, the tip of connecting portion has the through-hole, and the inner wall of through-hole is the inner wall of pressure release channel lateral wall, and the upper surface of the upper end of pressure release oral area and the upper surface parallel and level of connecting portion, through-hole be the pressure release mouth that makes progress of pressure release oral area, or, the upper surface of through-hole is sealed, and connecting portion non-orientation is equipped with side direction pressure release mouth in the direction of department of bending.
Preferably, at least a partial region of the inside of the extension 13 and/or at least a partial region of the inside of the connection 12 is provided with an insulating layer 14. According to fig. 1, the insulating layer 14 is preferably covered on the inside of the extension 13 corresponding to the part of the side shell, and different insulating layers 14 are preferably provided on the inside of the extension 13 near the area of the bend and far from the area of the bend. For example, a part of the inner side of the extension 13 near the bending part is covered with the hard insulating layer 14, the hard insulating layer 14 in the area is double-sided adhesive tape, while in an end part area far away from the bending part, a part of the hard insulating layer 14 corresponding to the side casing is single-sided adhesive tape, the extension 13 of the section is not bonded with the hard insulating layer 14, so that the extension 13 of the section is conveniently bent outwards to form an external top pole of the battery. Preferably, the upper portion of the extension 13 is integrated with the side of the cylindrical housing after the double-sided adhesive is cured.
At least partial area of the inner side of the connecting part 12, namely the partial area of the connecting part 12 facing the top cover body 11, is also provided with a hard insulating layer 14 to avoid short circuit of the positive and negative electrodes of the battery caused by the adapter sheet. Preferably, in the embodiment 1, the area of the connecting portion 12 close to the upper end of the corresponding side shell at the bending position is provided with a hard insulating layer 14;
preferably, in this embodiment 1, the insulating layer 14 is made of wear-resistant and hard material, such as thick highland barley paper or thin epoxy board or cured insulating glue layer;
preferably, according to fig. 3-4, the extension 13 is an elongated flat plate, preferably with the outer side connecting surface of the extension 13 being a plane.
As another preferred embodiment, according to fig. 5-6, the outer side connecting surface of the extension portion 13 is a cylindrical surface, and the cylindrical surface is configured to be capable of fitting with the housing pole of the adjacent cylindrical battery, so as to increase the contact area with the side housing of the other cylindrical battery and increase the power connection capacity. Preferably, the cylindrical radius of the outside connection surface of the extension 13 is equal to the sectional radius of the cylindrical housing 20.
Example 2
This embodiment 2 provides a cylindrical battery, and its packaging structure who adopts the cylindrical battery of embodiment 1 to possess the electric core subassembly, the electric core subassembly sets up in the enclosure space that cylindrical shell 20 and top cap body 11 enclose. It should be understood by those skilled in the art that the present embodiment 2 does not limit the battery cell assembly, and all the conventional battery cells in the art can be used in the present embodiment 2, such as the lithium ion battery cells conventional in the art.
The top utmost point post and the top cap body and/or the connecting portion electricity of electricity core subassembly are connected, and the casing utmost point post and the cylindrical casing electricity of electricity core subassembly are connected, and insulating sealing connection between the periphery of top cap body and the cylindrical casing. It will be appreciated by those skilled in the art that the top terminal post of the electric core assembly can be electrically connected to the top cap body, and in some preferred embodiments, the top terminal post of the electric core assembly can also be directly electrically connected to the connecting portion.
The cylindrical battery of embodiment 2 has a top terminal post arranged on the side, is beneficial to being connected in series or in parallel to form a group, is particularly suitable for the preparation process of a new energy vehicle power battery unit, and can conform to the development trend of CTP and CTC.
The cylindrical battery in the embodiment 2 is preferably a power battery with high energy density, and the size specification of the cylindrical battery can be selected from 18650 batteries, 21700 batteries, 46800 batteries and the like. Particularly, the 46-diameter series of novel large cylindrical batteries are not mass-produced, the industrial chain of components is completely new, and the battery is particularly suitable for cutting in new battery components, but not limited thereto, and those skilled in the art should understand that cylindrical batteries of any specification are suitable for the solution of the present embodiment, and cylindrical batteries that are approximately cylindrical, such as cylindrical batteries with a section of a rounded rectangle, a rounded triangle, or a rounded polygon, are also suitable for the solution of the present embodiment, and can be regarded as cylindrical batteries.
Meanwhile, both the bare cell and the cell in which the side case is entirely covered with the insulating layer 14 are applicable. The insulating layer 14 of the battery, which is entirely covered with the insulating layer 14, is sandwiched between the extension portion 13 and the side case, and between the connection portion 12 and the upper end of the side case. Those skilled in the art will appreciate that when a cylindrical battery is employed with the insulating layer 14, the insulating layer 14 should have one or more windows that expose the housing posts for electrical connection with the side extensions or side housings of adjacent batteries.
Example 3
This example 3 provides a serial battery row including a plurality of cylindrical batteries of example 2, as shown in fig. 7.
A plurality of cylindrical batteries are arranged in sequence, the switching piece of the first cylindrical battery is used as an external top pole of the battery row, the extension parts 13 of other cylindrical batteries in the battery row are electrically connected with the side shell of the cylindrical shell 20 of the previous cylindrical battery in sequence, preferably, the plane of the extension part is perpendicular to the connecting line of the circle centers of the adjacent cylindrical batteries, the extension parts are conveniently pressed and tightly extruded on the batteries at the two ends of the connecting line, and the cylindrical shell 20 of the last cylindrical battery can be used as an external shell pole of the battery row.
Preferably, as shown in fig. 7, example 3 first shows a serial battery row scheme in which a plurality of cylindrical batteries are arranged in a straight line. It should be understood by those skilled in the art that when a left circle center connecting line and a right circle center connecting line formed by a cylindrical battery and a left and right adjacent cylindrical battery are not in the same straight line, the plane of the extending portion 13 of one cylindrical battery is always perpendicular to the circle center connecting line of the adjacent cylindrical battery which is electrically connected, the orientation of the extending portion 13 of each cylindrical battery correspondingly deflects by an angle along with the continuous circle center connecting line, the deflection angle ranges from 0 to 160 degrees, the limit of the deflection angle is related to the width of the adapter plate, and the deflection angle can even reach 170 degrees without interference. Therefore, the serial battery row of the embodiment can realize a very flexible structure, such as a zigzag arrangement or a curve arrangement, and the adjacent cylindrical batteries can be arranged in any anode and cathode directions to form the serial battery row, which provides possibility for using the battery row in an application scene of a special structure.
Preferably, the series battery row further comprises an outward turning part of the extension part 13 of the row head cylindrical battery, the outward turning part is located at the lower end of the extension part 13, and the outward top pole of the battery row is formed by outwards bending the portion, corresponding to the single-sided adhesive-backed hard insulating layer, of the extension part. Since the insulating layer 14 corresponding to the upper portion of the extension portion is double-sided adhesive and is cured into an integrated structure, the external pull resistance of the top pole is improved.
Preferably, the series battery row further comprises an access bridge 40 electrically connected to the cylindrical housing 20 of the row end cylindrical battery, which access bridge 40 is capable of acting as an outer housing pole of the battery row. Preferably, the bridge 40 has one end electrically connected to the side casing inside the last cylindrical battery, the other end extending to the outside of the battery row, and the bridge 40 and the side casing of the second last cylindrical battery of the battery row have an insulating structure. The access bridge 40 partially surrounds the side casing of the end-row cell to increase the contact area. Preferably, the access bridge 40 is an extension part of the long conducting strip after being bent for multiple times to form a closed flat hollow conductor, the hollow conductor is in a shape of a double-side arc after being extruded by the battery side shells on two sides and is close to the cylindrical shells on two sides, and the external drawing resistance of the access bridge as a battery row to the pole of the outer shell is greatly improved.
Preferably, there is a bridge structure and/or a cold-welded structure between the extension 13 and the side housing of the cylindrical housing 20.
Preferably, the bridge structure may be a hollow or solid conductor. Preferably, the hollow conductor is a closed flat hollow conductor formed by sequentially bending the conducting strip at least twice; preferably, the hollow conductor may also be a ring-shaped hollow conductor with conducting strips electrically connected end to end, preferably in a flattened state. Preferably, the solid conductor is a solid conductor with a thermal fusing function, such as a low-melting-point metal, a thermal fusing columnar conductor.
Preferably, the bridge structure and the cold welding structure can be provided together to achieve better electrical connection effect. For example, the outside of the hollow conductor is coated with cold-welding glue and is placed between the extension part 13 and the side shell of the cylindrical shell 20, so that the electric connection area and the reliability are increased. Preferably, the inner side of the hollow conductor is coated with cold welding glue, and the electric channel between the extension part and the cylindrical shell is additionally provided with a direct-connection channel which passes through the inner center of the outer sides of the two sides of the hollow conductor besides the existing shell channel.
In a preferred embodiment, the electrical connection and the structural connection of the battery rows connected in series are all-glued, i.e. the electrical connection is made by the cold welding process described above, and the structural connection is made by structural glue, such all-glued battery rows being convenient for quick and nondestructive recycling and dismantling by chemical dismantling.
Example 4
This embodiment 4 firstly provides a housing terminal parallel battery row. The parallel battery row includes a plurality of cylindrical batteries of example 2. Each battery row is formed by arranging a plurality of the cylindrical batteries; the cylindrical shells 20 of the adjacent cylindrical batteries in the same battery row are electrically connected, and the battery row with shell poles connected in parallel and top poles disconnected is obtained. Preferably, the cells in a row are arranged in the same direction and in a straight line.
Further, the present embodiment 4 provides a battery pack according to fig. 8 to 11, including:
preferably, the centers of the cylindrical batteries in the adjacent battery rows are opposite to the gap position of two cylindrical batteries in the other battery row.
The extension parts 13 of all cylindrical batteries in each battery row are positioned at the same side of the battery row, the extension parts of a plurality of battery rows are arranged in the same direction, each extension part faces to the side shell of the adjacent cylindrical shell 20 of the adjacent battery row, and other cylindrical batteries in the battery row are electrically isolated; preferably, the plane of the extension part is perpendicular to the circle center connecting line of the adjacent electrically connected cylindrical batteries; preferably, the orientation of the extension 13, i.e. the extension direction of the connecting portion 12, is approximately 60 degrees from the battery row.
The extension parts 13 of all the cylindrical batteries in each battery row are electrically connected with the side casing of the cylindrical casing 20 of the next battery row in turn; all cylindrical batteries of each battery row are of parallel connection structures, and a plurality of battery rows are of series connection structures.
Preferably, at least one end of each battery row is provided with a transfer bridge 30; the thickness of the bridge 30 is approximately equal to the distance that the row of cells is staggered from an adjacent row of cells. Preferably, the transfer bridge 30 further includes an electrical connection portion 12, where the electrical connection portion 12 can be electrically connected to a certain cylindrical housing 20 of the corresponding battery row through the surface or the inside of the transfer bridge 30, preferably, the adjacent cylindrical housing, and the other end is disposed at any position of the transfer bridge, so as to be conveniently electrically connected to an external mechanism, thereby achieving the functions of expanding, balancing, monitoring and the like of the battery row.
Preferably, the extension portion 13 has a second electrical connection portion 60 with the side case of the corresponding cylindrical case 20 of the adjacent battery row, and has a first electrical connection portion 50 with the side case of the adjacent cylindrical case 20 in the battery row, and the first electrical connection portion 50 and/or the second electrical connection portion 60 has a bridge structure and/or a cold welding structure.
Preferably, the bridge structure may be a hollow or solid conductor. Preferably, the hollow conductor is a closed flat hollow conductor formed by sequentially bending the conducting strip at least twice; preferably, the hollow conductor may also be a ring-shaped hollow conductor with conducting strips electrically connected end to end, preferably in a flattened state. Preferably, the solid conductor is a solid conductor with a thermal fusing function, such as a low-melting-point metal, a thermal fusing columnar conductor. Preferably, the bridge structure and the cold welding structure can be provided together to achieve better electrical connection effect. Such as the interior and exterior of the hollow conductors, are provided with cold-weld glue which is placed between the extension 13 and the side casing of the cylindrical casing 20, and between the side casings of adjacent cylindrical casings 20 in the battery row.
Preferably, the battery pack includes an external top pole bus portion electrically connected to the extended portions of all cylindrical cells of the first cell row (the uppermost row in fig. 9), i.e., single-layer bus.
Preferably, the battery pack includes an external top pole converging structure, that is, a hierarchical and multi-level converging embodiment, specifically, the external top pole converging structure includes a multi-stage external top pole converging structure in a direction from a primary converging portion on the battery pack side to an external final converging portion, and the number of converging portions at each stage in the forward direction is gradually reduced; the primary external top pole column bus part consists of a plurality of bus parts, each bus part is electrically connected with the extension parts of the corresponding partial cylindrical batteries of the first battery row, and all the bus parts correspond to the extension parts of all the cylindrical batteries of the first battery row; preferably, the external top pole converging structure may further include a secondary converging portion, the secondary converging portion is a final converging portion, all external top pole converging portions in the primary external top pole converging portion are electrically connected to the inside, and the outside is electrically connected to an external load, so that grouping and multi-level converging are achieved.
Preferably, the external top pole converging structure is a secondary structure, the primary top pole converging portion is two external top pole converging portions which are sequentially arranged and correspond to the equivalent cylindrical battery extension portion, two anodes of external parallel loads are respectively connected to the outside, and the converging portion between the anodes of the external parallel loads is the final top pole converging portion.
It will be appreciated by those skilled in the art that the multiple external top poles of the battery can reduce the current carrying capacity requirement on a single top pole, and is the primary top pole convergence portion of the multi-stage top pole convergence structure, and the final top pole convergence portion is the total external top pole of the battery.
Preferably, the extension parts of all cylindrical batteries in the first battery row face the direction perpendicular to the trend of the battery row, and the external top pole converging part is attached to and electrically connected with the extension parts. Preferably, the extension direction of the battery row is different from that of other battery rows, and the surfaces of all the extension parts in the battery row are in the same plane so as to be attached to the external top pole converging part conveniently. Those skilled in the art will understand that the extending portions of all the cylindrical batteries in the primary battery row are not necessarily required to face the direction perpendicular to the direction of the battery row, and the external top pole bus-bar portion may be configured to match the shape of the outer side of the cylindrical shell of the primary battery row, so as to realize stable electrical connection in almost any extending portion.
Preferably, the battery pack includes a plurality of pairs of housing poles, one end of each housing pole is electrically connected to the cylindrical housing of any cylindrical cell of the last cell row (the lowermost row in fig. 9), each housing pole is electrically connectable to a load, and the battery pack is electrically connectable to multiple loads simultaneously.
Preferably, the battery pack includes an outer case pole bus portion electrically connected to the cylindrical cases of all the cylindrical cells of the last cell row (the lowermost row in fig. 9), i.e., a single-layer structure. Or, including outer casing utmost point post structure of converging, outer casing utmost point post structure of converging includes a plurality ofly to outer casing utmost point post portion of converging, and outer casing utmost point post portion of converging is connected with the cylindrical casing electricity of the partial cylindrical battery of last battery row respectively. Preferably, the outer casing pole post converging structure can further comprise a second-stage converging portion, and the second-stage converging portion is electrically connected with all the outer casing pole post converging portions to achieve grouping and multi-level converging.
Preferably, the above-mentioned external top pole post converging structure converges gradually, that is, a part of the external top pole post converging portion is connected to another secondary converging portion with a stronger current-carrying capability. It should be understood by those skilled in the art that the external top pole bus structure may have more layers, such as three, four or more layers, and the plurality of external top pole bus portions may be uniformly or non-uniformly arranged. The number of the confluence parts is reduced step by step, and the current-carrying capacity of the confluence approach bridge is increased. The scheme can correspond to capacity-division power distribution of a multi-motor electric drive system.
Preferably, according to fig. 9-10, there is structural glue 70 between the transfer bridge 30 and the cylindrical housings 20 of the cylindrical cells, and/or between the cylindrical housings 20 of the cylindrical cells in the same row, and/or between the cylindrical housings 20 of the corresponding cylindrical cells of adjacent rows. It will be appreciated by those skilled in the art that structural adhesive 70 may also be provided at any location within the battery where it is desired to maintain structural relationship. Preferably, the structural adhesive 70 is located on the connection line of the centers of the adjacent cylindrical batteries, and in addition to stabilizing the positional relationship of the adjacent cylindrical batteries, the insulating cured structural adhesive 70 can prevent the possible short circuit between the batteries due to extrusion.
As shown in fig. 9, the battery pack 100 includes 5 single cylindrical batteries 1 arranged in the transverse direction in a battery row, and 6 battery rows arranged in the longitudinal direction, i.e., a 5X6 array. Of course, those skilled in the art will understand that the battery pack of the present embodiment may also be a 3X4 array, a 6X8 array, a 10X4 array, an 8X20 array, an 8X40 array, and so on. The embodiment does not limit the lateral and longitudinal expansion of the battery pack.
In a preferred embodiment, the electrical connection and the structural connection of the parallel battery row and the battery pack of the embodiment adopt an all-adhesive process, that is, the electrical connection adopts the cold welding process, and the structural connection adopts structural adhesive bonding, so that the all-adhesive battery row or the battery pack is convenient to recycle and disassemble.
In the battery pack of example 4, there is no additional common bus structure in the pack, i.e., there is no bus member running through the entire battery string, and thus a series grouping scheme between parallel strings in a string can be achieved.
Example 5
The present embodiment provides a method of manufacturing the battery pack of embodiment 4, including:
the cylindrical batteries are arranged in a row in the single-row jig, and the direction of the adapter sheet of each cylindrical battery is adjusted to be consistent according to the direction of the adapter sheet of the cylindrical battery;
cold welding structures and/or approach bridges are clamped between adjacent battery shells in the battery row, and the two sides of the cold welding structures and/or approach bridges are compacted to form a linearly arranged battery row with a fixed length, wherein shell pole columns of all cylindrical batteries in the battery row are connected in parallel;
preparing a plurality of battery rows;
arranging a plurality of battery rows in the integral jig in a staggered manner, arranging the batteries with approach bridges in the last row, clamping a cold welding structure between the cylindrical shell 20 and the extension part 13 of the adjacent battery row, pressing the plurality of battery rows along the inter-row direction, and connecting the top poles of the batteries in the rows in parallel to obtain a battery pack connected in series between the adjacent battery rows;
simultaneously, using a multi-point glue head dispensing device on two surfaces of the end part and the bottom part of the battery pack, dispensing structural glue between adjacent batteries at one time, and simultaneously curing the two surfaces by ultraviolet light;
removing the single-row jig and the integral jig to obtain a cured battery pack;
the switching piece extension parts of all the batteries of the first row of battery rows are electrically connected with the top pole converging part.
Example 6
This example 6 provides a solution for the application of the above battery pack in CTC.
The group battery top is equipped with insulation board (rigidity, wear-resisting), and the insulation board corresponds group battery top one side and is equipped with elastic material (flexibility, compresses tightly non-planar battery top region). The elastic material is back-glued on one side corresponding to the top of the battery, through holes corresponding to the pressure relief openings of the battery are formed in the elastic material and the insulating plate, and the insulating plate is used for electrically isolating the top of the battery from an upper object and reserving a pressure relief channel;
a composite battery box cover is arranged above the insulating plate, and a structural member is arranged at the upper part of the box cover and is used for fixing the structure of an object in the vehicle, such as a seat; the box cover is provided with reinforcing ribs to increase the bending resistance of the box cover, a pressing strip is arranged below the box cover and used for compressing the insulating plate, and the pressing strip is locked with the side wall of the battery box or a chassis structural member to keep the structural integration of the box cover and the battery pack.
And bending strips protruding upwards are arranged at the positions of the battery box covers corresponding to the upper parts of the rows of pressure relief openings, and thermal insulation materials are arranged inside the bending strips. Preferably, the bending strip is a reinforcing rib of the box cover, the isolation bin is used for collecting heat flow discharged by the thermal runaway battery, and the collected heat flow is released to the outside from the pressure relief ports of the vehicle body on two sides of the protruding bending strip.
This embodiment 4 also provides a chassis structure suitable for above-mentioned group battery:
1) the left box body and the right box body of the battery box are clamped between the two girders of the chassis, and the structure is integrated;
2) the upper cover of the battery box is fixed on the side wall of the battery box or the upper part of the girder and is integrated with the side wall of the box body and a large number of structures;
3) the upper surface of the upper cover of the battery box is flush with the upper end surface of the girder to form a flat girder; the upper surface is integrally provided with components in the vehicle compartment.
4) The side surface of the battery box is the inner side wall of the girders on the two sides;
5) the lower surface of the battery box is flush with the lower end face of the girder, and the ground clearance of the girder (the whole vehicle) is the ground clearance of the bottom surface of the battery box.
Example 7
This example 7 provides a method of making the CTC scheme of example 6 above. The method comprises the following steps:
1) the outer part of the bottom/side part of the battery box and the structural part of the vehicle chassis are structurally integrated;
2) the batteries in rows are guided by the adapter plates, arranged in rows in a single-row jig, provided with the adapter bridge 30, clamped with a cold welding structure between the adjacent cylindrical shells 20 of the batteries, and pressed at two sides, the batteries are arranged in a fixed-length straight row, and the batteries in the row are connected in parallel;
3) the single-row jigs are arranged in the integral jig in a staggered mode, a cold welding structure is clamped between adjacent battery shells and the adapter plates between rows, the batteries between the rows are compressed in the direction (the thickness of the adapter bridge 30 controls the minimum distance between the rows), the battery arrays form a fixed-width matrix, and the adjacent battery rows are connected in series; obtaining a battery pack;
4) functional components such as a PCB (printed circuit board) and the like are arranged on the side surface of the battery pack (namely the battery array);
5) respectively dispensing structural adhesive 70 on the whole surface between adjacent battery side shells (near end surfaces) and between the PCB and the battery shells on the upper end surface, the lower end surface and the side surfaces of the battery array by using an integral dispensing method, and simultaneously dispensing a plurality of surfaces;
6) multiple surfaces are simultaneously cured, and the battery array structure is integrated; withdrawing the single-row jig;
7) spraying a quick-drying bonding layer (polyurea) at the bottom of the battery box;
8) pressing the bottom of the battery array into the bonding layer, closing the locking mechanism of the side surface structure of the battery box, withdrawing the two sides of the battery array, withdrawing the whole jig, and integrating the battery array with the bottom/side surface structure of the battery box;
9) the functional assembly is electrically connected with the battery array on the upper surface of the battery array, and the battery array is electrically connected with the external pole of the box body;
10) a pressing locking device for arranging batteries is arranged between the upper surface of the battery array and the bottom/side surface of the battery box;
11) and the lower part of the upper cover of the composite battery box with the upper structure connecting piece is structurally locked with the bottom/side part of the battery box and the vehicle chassis structure on the upper surface of the battery array, and the battery box and the chassis structure are integrated.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (24)
1. An encapsulation structure of a cylindrical battery, comprising:
a cylindrical housing having an open end;
the composite top cover comprises a top cover body and a switching piece;
the top cover body is a conductor, is arranged at the opening end of the cylindrical shell and can close the opening end;
the adapter sheet is a conductor and is provided with a bent part, and the two ends of the bent part are respectively a connecting part and an extending part of the adapter sheet; the connecting part is electrically connected with the top cover body; the inner side of the extension part is arranged close to the side shell of the cylindrical shell and is not electrically connected with the cylindrical shell; the outer side of the extension part is used for being electrically connected with the shell pole of other cylindrical batteries.
2. The package structure of claim 1, wherein the header body has a relief portion; the pressure relief portion is arranged in the center of the top cover body, or the pressure relief portion is arranged in a position, which is not in the center, of the top cover body.
3. The package structure according to claim 1, wherein the connecting portion faces a side of the top cap body and has an annular electrical connection structure, and the annular electrical connection structure electrically connects the top cap body and the interposer; the annular electrical connection structure is preferably a crown structure.
4. The package structure of claim 3, wherein at least a partial region of the connecting portion is attached to and electrically connected to the top cap body.
5. The package structure according to claim 3, wherein the connecting portion is integrally formed with the annular electrical connection structure, and the annular electrical connection structure is connected to the top cap body by a hot welding or cold welding process.
6. The package structure of claim 3, wherein the connecting portion is integrally formed with the annular electrical connection structure and the top cap body.
7. The package structure according to claim 1, wherein at least a partial region of an inner side of the extension portion and/or at least a partial region of an inner side of the connection portion has an insulating layer; the insulating layer is used for insulating the adapter plate and the cylindrical shell.
8. The package structure according to claim 7, wherein at least a partial region of the inner side of the extension is covered with a hard insulating layer, and the hard insulating layer is a double-sided adhesive tape.
9. The package structure according to any one of claims 1 to 8, wherein the connecting portion has a pressure relief hole at a position corresponding to the pressure relief portion.
10. The package structure of any one of claims 1-8, wherein the extension lateral connection surface is planar.
11. The encapsulation structure according to any one of claims 1 to 8, wherein the outside connection surface of the extension portion is a cylindrical surface configured to be able to fit with a housing pole of an adjacent single cylindrical battery.
12. A cylindrical battery comprising the cylindrical battery packaging structure of any one of claims 1 to 10 and an electric core assembly;
the electric core assembly is arranged in a closed space enclosed by the cylindrical shell and the top cover body;
the top utmost point post of electricity core subassembly with the top cap body and/or connecting portion electricity is connected, the casing utmost point post of electricity core subassembly with cylindrical casing electricity is connected, the periphery of top cap body with insulating sealing connection between the cylindrical casing.
13. A series battery bank comprising a plurality of cylindrical batteries according to claim 12;
a plurality of cylindrical batteries arrange in proper order, arrange first cylindrical battery the extension does the external top utmost point post that the battery was arranged, other cylindrical batteries in the battery row the extension is connected with the side casing electricity of the cylindrical casing of previous cylindrical battery in proper order, and the cylindrical casing of arranging last cylindrical battery can be regarded as the external casing utmost point post that the battery was arranged.
14. The battery bank of claim 13, wherein the plurality of cylindrical batteries are arranged in a straight line, or in a zigzag line, or in a curved line.
15. The battery row of claim 13, further comprising an access bridge electrically connected to the cylindrical housing of the row end cylindrical battery, the access bridge capable of acting as an external housing post for the battery row.
16. The battery row as claimed in claim 13, wherein a bridge structure and/or a cold welding structure and/or a structural adhesive sealing structure is arranged between the extension part and the side shell of the cylindrical shell.
17. A battery pack, comprising:
a plurality of staggered battery rows, each of said battery rows being formed of a plurality of the cylindrical battery arrangements of claim 12; the cylindrical shells of the adjacent cylindrical batteries in the same battery row are electrically connected;
the extension parts of all the cylindrical batteries in each battery row are positioned at the same side of the battery row and face the side shell of the cylindrical shell of the adjacent battery row;
the extension parts of all the cylindrical batteries in each battery row are electrically connected with the side shell of the adjacent cylindrical shell of the next battery row in sequence;
all the cylindrical batteries of each battery row are of parallel structures, and a plurality of battery rows are of serial structures.
18. The battery of claim 17, wherein at least one end of each battery row is provided with a transfer bridge; the thickness of the transfer bridge is approximately equal to the distance of the battery row and the adjacent battery row.
19. The battery of claim 17, wherein the extension of all cylindrical cells in each row are oriented at the same included angle as the row.
20. The battery according to any one of claims 17 to 19,
and an electric bridge structure and/or a cold welding structure and/or a structural adhesive bonding and sealing structure is arranged between the extension part and the side shell of the adjacent battery row corresponding to the cylindrical shell and between the side shells of the adjacent cylindrical shells in the battery row.
21. The battery according to any of claims 17-19, comprising an outer top pole bus-bar electrically connected to said extensions of all cylindrical cells of the primary row;
or, including outer top utmost point post structure of converging, including a plurality of outer top utmost point post portions of converging to outer top utmost point post structure of converging, outer top utmost point post portion of converging respectively with the partial cylindrical battery of first battery row the extension electricity is connected.
22. The battery of claim 21, wherein the extensions of all cylindrical cells in the leading row are oriented perpendicular to the direction of the row, and wherein the pair of outer top pole bus bars are attached to and electrically connected to the extensions.
23. The battery according to any of claims 17-19, comprising an outer housing pole bus electrically connected to the cylindrical housings of all cylindrical cells of the last row;
or, including outer casing utmost point post structure of converging, including a plurality of to outer casing utmost point post portion of converging to outer casing utmost point post structure of converging, to outer casing utmost point post portion of converging respectively with the partial cylindrical battery of last battery row cylindrical shell electricity is connected.
24. The method of manufacturing a battery pack according to any one of claims 17 to 23, comprising:
the cylindrical batteries are arranged in a row in the single-row jig, and the direction of the adapter sheet of each cylindrical battery is adjusted to be consistent according to the direction of the adapter sheet of the cylindrical battery;
cold welding structures are clamped between cylindrical shells of adjacent cylindrical batteries in the battery row, and the two sides of the cold welding structures are pressed tightly to form a linearly arranged battery row with a fixed length, wherein the cylindrical shells of all the cylindrical batteries in the battery row are connected in parallel;
preparing a plurality of the battery rows;
and arranging a plurality of battery rows in the whole jig in a staggered manner, clamping a cold welding structure between the cylindrical shell and the extension part of each adjacent battery row, and pressing the battery rows in the row direction to ensure that the cylindrical shell of the corresponding cylindrical battery between the adjacent battery rows is electrically connected with the extension part to obtain the battery pack connected in series between the adjacent battery rows.
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| CN115084783A (en) * | 2022-04-08 | 2022-09-20 | 汪纯 | Electric connection structure of cylindrical battery, battery pack and manufacturing method of battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115084783A (en) * | 2022-04-08 | 2022-09-20 | 汪纯 | Electric connection structure of cylindrical battery, battery pack and manufacturing method of battery pack |
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