CN114156527A - Lithium battery structure and assembling method thereof - Google Patents
Lithium battery structure and assembling method thereof Download PDFInfo
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- CN114156527A CN114156527A CN202111469751.4A CN202111469751A CN114156527A CN 114156527 A CN114156527 A CN 114156527A CN 202111469751 A CN202111469751 A CN 202111469751A CN 114156527 A CN114156527 A CN 114156527A
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- assembly
- connecting piece
- aluminum shell
- cover plate
- winding core
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 88
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000004804 winding Methods 0.000 claims abstract description 82
- 238000005452 bending Methods 0.000 claims abstract description 35
- 230000000712 assembly Effects 0.000 claims abstract description 29
- 238000000429 assembly Methods 0.000 claims abstract description 29
- 238000003466 welding Methods 0.000 claims description 66
- 239000000758 substrate Substances 0.000 claims description 39
- 239000002390 adhesive tape Substances 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 9
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000009413 insulation Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a lithium battery structure and an assembly method thereof, relating to the technical field of lithium ion batteries; the device comprises a plurality of winding core assemblies, a cover plate assembly, a connecting plate assembly and an aluminum shell assembly; the winding core assembly comprises a pole lug, the connecting piece assembly comprises a boss and a bending stress hole, and the cover plate assembly comprises a pole; the pole column is provided with a pole column hole, the connecting piece assembly and the cover plate assembly are fixed through the boss and the pole column hole on the pole column, the connecting piece assembly is fixed with the pole lug on the roll core assembly, and the connecting piece assembly is bent through the bending stress hole; the plurality of roll core assemblies and the connecting piece assemblies are arranged in the aluminum shell assembly together, and the aluminum shell assembly is fixed with the cover plate assembly; the invention provides a lithium battery structure and an assembly method thereof, which can solve the problem of short circuit of a lithium battery caused by a large amount of metal dust generated in the prior art when a connecting sheet and a cover plate are welded and enter the inside of a winding core, and can improve the energy density of the lithium battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery structure and an assembly method thereof.
Background
The traditional lithium battery assembling method at present is as follows: firstly, connecting two single winding cores together by adopting a butterfly welding process, namely welding two lugs with the same polarity together by utilizing ultrasonic waves through connecting sheets; secondly, welding the connecting sheet and the corresponding polar columns with the same polarity on the cover plate together through laser, and buckling a stop frame at a welding spot; combining the two single-winding cores, and fixing the two single-winding cores through a binding adhesive tape; and fourthly, filling the battery cell into the aluminum shell, and finishing the sealing welding of the cover plate and the aluminum shell through laser.
The method mainly has the following defects:
1. in the laser welding process of the connecting sheet and the cover plate, a large amount of metal dust can be generated, and the welding positions are close to the opening of the winding core, so that the metal dust can easily enter the winding core, and the lithium battery is scrapped after short circuit;
2. the processing and manufacturing procedures are complex, and need to involve a plurality of procedures such as tab ultrasonic welding, connecting sheet laser welding, buckling stop frame, core combination and the like, and in the connecting sheet laser welding procedure, the positioning of the winding core and the connecting sheet is not easy to realize, thereby reducing the qualification rate and the utilization rate of manufacturing;
3. in the core combining procedure, the alignment degree of the two single winding cores is not easy to control, risks such as breakage, reverse insertion into the winding cores and the like easily occur when the positive and negative electrode lugs are bent, and when the number of the winding cores of a single lithium battery is increased, the bending defect of the electrode lugs is more obvious, so that the process application is greatly limited;
4. because the mode that a set of aluminum shell disposes a set of apron is adopted, this scheme has not effectively promoted the energy density of lithium cell, reduces manufacturing cost to make the manufacturing sink into the bottleneck.
Publication No. CN208368654U discloses a core combining device for a lithium battery, and in the background art, the current battery core assembling process of the lithium battery is as follows: A. pre-welding the lugs of the winding core B by using an ultrasonic welding machine respectively; A. b, welding the pole lug, the gasket and the connecting sheet together by using an ultrasonic welding machine after the winding cores are paired; welding the gasket and the cover plate together by using a laser welding machine; A. and B, performing core packing glue operation on the core. This process is also known as butterfly welding.
Although the device disclosed by the patent has the functions of positioning the battery cell, compressing the cover plate and synchronously combining the battery cells, the manufacturing efficiency and quality can be effectively improved, and the risks of broken tabs and short circuit and scrapping of the battery cells caused by core combination are effectively avoided; however, the device does not improve the butterfly welding process, and cannot solve the fundamental problem provided by the application.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to solve the problem that a large amount of metal dust that produces when connecting piece and apron weld among the prior art causes the lithium cell short circuit after getting into roll core inside and how to improve the energy density of lithium cell.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention discloses a lithium battery structure which comprises a plurality of winding core assemblies, a cover plate assembly, a connecting piece assembly and an aluminum shell assembly, wherein the cover plate assembly is arranged on the winding core assemblies; the winding core assembly comprises a pole lug, the connecting piece assembly comprises a boss and a bending stress hole, and the cover plate assembly comprises a pole; the pole column is provided with a pole column hole, the connecting piece assembly and the cover plate assembly are fixed through the lug boss and the pole column hole in the pole column, the connecting piece assembly is fixed with the lug on the roll core assembly, and the connecting piece assembly is bent through the bending stress hole; and the plurality of winding core assemblies and the connecting piece assemblies are arranged in the aluminum shell assembly together, and the aluminum shell assembly and the cover plate assembly are fixed.
Compared with the structure of the traditional lithium battery, the structure has the advantages that the large-area laser welding of the connecting sheet assembly and the cover plate assembly is converted into the laser welding of the boss and the pole post hole on the pole post, the welding position of the boss and the pole post hole is far away from the opening of the roll core assembly, metal dust generated in the laser welding process can be effectively prevented from entering the interior of the roll core assembly, and the risk of short circuit of the lithium battery is avoided; meanwhile, a plurality of winding core assemblies are bent through the bending stress holes in the connecting piece assembly and then are combined and placed in an aluminum shell assembly, and only one cover plate assembly is needed; in the traditional lithium battery structure, each roll core assembly needs to be provided with an aluminum shell assembly and a cover plate assembly; therefore, the lithium battery structure disclosed by the invention not only can save the using amount of the cover plate assembly, reduce the cost, reduce the welding times, improve the manufacturing efficiency and the qualification rate, but also greatly improve the energy density of the whole lithium battery.
Preferably, the winding core assembly further comprises a winding core body, and the tabs comprise a positive tab and a negative tab; the positive electrode lug and the negative electrode lug are fixed at two ends of the same end face of the winding core body.
Preferably, the connecting piece assembly further comprises a connecting piece, wherein the connecting piece comprises a positive connecting piece and a negative connecting piece; the connecting piece is provided with two rows of mutually parallel bending stress holes, the front surface of the connecting piece is fixed with the lug boss, the lug boss is positioned between the two rows of bending stress holes, and the positive connecting piece and the negative connecting piece have the same structure; the two ends of the positive connecting piece are fixed with the positive lugs respectively, and the two ends of the negative connecting piece are fixed with the negative lugs respectively.
Preferably, the cover plate assembly further comprises a substrate, an insulating sheet, a protection small piece, a liquid injection hole, an explosion-proof valve and a substrate step groove, wherein the pole comprises a positive pole column and a negative pole column, and the protection small piece comprises a positive pole protection small piece and a negative pole protection small piece;
the two ends of the substrate are respectively provided with a through hole, the insulating sheet covers the back of the substrate, the cross section of the insulating sheet at the through hole is in an I-shaped structure, the upper end of the insulating sheet covers the front of the substrate, the lower end of the insulating sheet covers the back of the substrate, the middle part of the insulating sheet is a penetrating structure, and the penetrating structure and the through holes are coaxially arranged; the positive pole post and the negative pole post are respectively fixed on the insulating sheets on the front surfaces of the two ends of the substrate, a pole post hole is respectively formed in each of the positive pole post and the negative pole post, and the pole post holes and the penetrating structures are coaxially arranged;
the insulating sheet is also provided with a plurality of vent holes, and the base plate is provided with the liquid injection hole and the explosion-proof valve; meanwhile, the edge of the back surface of the substrate is also provided with the substrate step groove; the boss on the connecting sheet assembly sequentially penetrates through the penetrating structure in the middle of the insulating sheet, the through hole in the substrate and the pole column hole in the pole column, and the boss and the pole column are fixed;
the length direction of connection piece with the length direction of base plate is perpendicular, connection piece length direction's both ends respectively with it is fixed to roll up utmost point ear on the core assembly, anodal ear is placed anodal connection piece with between the anodal protection piece, the negative pole ear is placed the negative pole connection piece with between the negative pole protection piece.
Preferably, the aluminum shell assembly comprises a first-class aluminum shell, a second-class aluminum shell and an aluminum shell stepped groove; the first-class aluminum shell and the second-class aluminum shell are both provided with the aluminum shell stepped grooves; the aluminum shell stepped grooves on the first class of aluminum shell and the aluminum shell stepped grooves on the second class of aluminum shell are matched and fixed with each other; the aluminum shell step groove on the first class aluminum shell and the aluminum shell step groove on the second class aluminum shell are respectively matched and fixed with the substrate step groove on the substrate.
Preferably, the lithium battery structure further comprises an insulating tape; and attaching the insulating adhesive tape to the position where the front side of the connecting sheet is fixed with the tab, and then attaching the insulating adhesive tape to the position where the back side of the connecting sheet is fixed with the tab and the small protection piece.
Preferably, the lithium battery structure further includes an insulating film; the insulating film is coated on the roll core assembly.
Preferably, the number of core assemblies is two or four.
The invention also discloses an assembling method adopting the lithium battery structure, when the number of the roll core assemblies is two, two ends of the connecting sheet are respectively fixed with the lugs on one roll core assembly, and the assembling steps are as follows:
s1: fixing the lug boss on the connecting piece assembly and the pole column hole on the cover plate assembly together by welding, and then fixing the connecting piece on the connecting piece assembly and the pole lug on the roll core assembly together by welding;
s2: attaching the insulating adhesive tape to the welding position of the front side of the connecting sheet and the tab, and attaching the insulating adhesive tape to the welding position of the back side of the connecting sheet, the tab and the small protection sheet;
s3: bending the two ends of the positive connecting sheet and the negative connecting sheet by 90 degrees towards the back direction of the cover plate assembly along the two rows of bending stress holes, and bending the roll core assembly by 90 degrees towards the back direction of the cover plate assembly along with the bending of the connecting sheets; then, the position of the tab is unchanged, and the winding core body is bent by 90 degrees along the position where the winding core body is contacted with the tab towards the front direction of the cover plate assembly; at the moment, the positive electrode lug and the negative electrode lug are both in a stretching state;
s4: coating the insulating film outside the two winding core bodies;
s5: and putting the roll core assembly, the connecting piece assembly, the cover plate assembly, the insulating tape and the insulating film into the aluminum shell assembly, and then fixing the gaps where the first-class aluminum shell, the second-class aluminum shell and the base plate are matched by laser welding.
The invention also discloses another assembling method adopting a lithium battery structure, when the number of the roll core assemblies is four, two ends of the connecting sheet are respectively fixed with the lugs on the two roll core assemblies, and the assembling steps are as follows:
s1: fixing the lug boss on the connecting piece assembly and the pole column hole on the cover plate assembly together by welding, and then fixing the connecting piece on the connecting piece assembly and the pole lug on the roll core assembly together by welding;
s2: attaching the insulating adhesive tape to the welding position of the front side of the connecting sheet and the tab, and attaching the insulating adhesive tape to the welding position of the back side of the connecting sheet, the tab and the small protection sheet;
s3: the same end of the positive connecting sheet and the negative connecting sheet is bent by 90 degrees towards the back direction of the cover plate assembly along the bending stress hole, at the moment, the two winding core assemblies are also bent by 90 degrees towards the back direction of the cover plate assembly along with the bending of the connecting sheets, then, the positions of the tabs are unchanged, and the two winding core bodies are bent by 90 degrees towards the front direction of the cover plate assembly along the positions of the winding core bodies contacting with the tabs; finally, the other ends of the positive connecting sheet and the negative connecting sheet and the other two winding core assemblies on the positive connecting sheet and the negative connecting sheet are repeated; at the moment, the positive electrode lug and the negative electrode lug are both in a stretching state;
s4: coating the insulating film outside the four winding core bodies;
s5: and putting the roll core assembly, the connecting piece assembly, the cover plate assembly, the insulating tape and the insulating film into the aluminum shell assembly, and then fixing the gaps where the first-class aluminum shell, the second-class aluminum shell and the base plate are matched by laser welding.
Therefore, the invention has the advantages that:
1. compared with the structure of the traditional lithium battery, the structure has the advantages that the large-area laser welding of the connecting sheet assembly and the cover plate assembly is converted into the laser welding of the boss and the pole post hole on the pole post, the welding position of the boss and the pole post hole is far away from the opening of the roll core assembly, metal dust generated in the laser welding process can be effectively prevented from entering the interior of the roll core assembly, and the risk of short circuit of the lithium battery is avoided; meanwhile, a plurality of winding core assemblies are bent through the bending stress holes in the connecting piece assembly and then are combined and placed in an aluminum shell assembly, and only one cover plate assembly is needed; in the traditional lithium battery structure, each roll core assembly needs to be provided with an aluminum shell assembly and a cover plate assembly; therefore, the lithium battery structure disclosed by the invention not only can save the using amount of the cover plate assembly, reduce the cost, reduce the welding times, improve the manufacturing efficiency and the qualification rate, but also greatly improve the energy density of the whole lithium battery.
2. Compared with the traditional lithium battery, the lithium battery has the advantages that the tabs with shorter lengths are adopted, and the tabs are all in a stretching state, so that the risk of reverse insertion of the tabs can be avoided; in the traditional method, the assembly relationship between the winding core assembly and the cover plate assembly needs to be considered, so after the winding core assembly is directly assembled on the cover plate assembly, the risks of tab pulling and breakage can exist during core combination, and the winding core assembly is not directly connected with the cover plate assembly, so that the risk is avoided.
3. Compared with the traditional lithium battery structure, the lithium battery structure can realize the assembly operation of the double-winding core and the four-winding core of the lithium battery, has very wide compatible range, and greatly improves the process adaptability; the manufacturing process of the invention is simpler, the processes of laser welding of the connecting sheet, buckling of the stop frame, core combination and the like are eliminated, and the positioning of the winding core is easier to realize, thereby improving the qualification rate and the utilization rate of the manufacturing.
4. The connecting sheets are separated from the substrate and the polar columns by the insulating sheets, so that the short circuit caused by mutual conduction between the connecting sheets is avoided, and the short circuit caused by mutual conduction between the polar columns is also avoided; the plurality of vent holes formed in the insulating sheet reduce the weight of the insulating sheet so as to improve the energy density of the battery, and gas generated in the battery is smoothly discharged to the explosion-proof valve; the invention also adopts the protection small piece, thus ensuring the welding strength of the tab and the connecting piece; according to the invention, the insulating adhesive tape is adopted to prevent residual dust in the welding area after the welding of the connecting sheet, the tab and the protective small sheet is completed from diffusing into the winding core body in the subsequent assembly process, so that the short circuit of the battery is avoided; the insulation film adopted by the invention can fix the two winding core bodies together, is convenient for the stability of the shapes of the cover plate assembly and the pole ear, is also convenient for the subsequent transfer of the winding core assembly, and can prevent the winding core assembly from being damaged in the shell entering process.
Drawings
FIG. 1 is a schematic front perspective view of a coil assembly, a connecting piece assembly and a cover plate assembly being welded together according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a back side perspective view of a roll core assembly, a connecting piece assembly and a cover plate assembly when welded together according to an embodiment of the present invention;
FIG. 3 is a schematic front perspective view of a roll core assembly, a connecting piece assembly and a cover plate assembly after being welded together and then being glued according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a back side perspective view of a tape after welding the roll core assembly, the connecting sheet assembly and the cover plate assembly according to an embodiment of the present invention;
FIG. 5 is a schematic perspective view of a connection piece after bending is completed according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of an embodiment of the present invention before the completion of the insulation film coating;
FIG. 7 is a schematic perspective view of a completed insulation film according to an embodiment of the present invention;
FIG. 8 is a schematic perspective view of a reel assembly after being assembled into an aluminum housing assembly in accordance with an embodiment of the present invention;
FIG. 9 is a schematic perspective view of a core assembly in an embodiment of the invention;
FIG. 10 is a schematic diagram of a front perspective view of the cover plate assembly and the connecting assembly in accordance with one embodiment of the present invention;
FIG. 11 is a schematic diagram of a rear perspective view of the cover plate assembly and the connecting assembly in accordance with an embodiment of the present invention;
FIG. 12 is an enlarged partial schematic view at A of FIG. 11;
FIG. 13 is a cross-sectional view taken at B-B of FIG. 11;
FIG. 14 is a schematic perspective view of an aluminum case according to one embodiment of the present invention;
FIG. 15 is an enlarged partial schematic view at C of FIG. 14;
FIG. 16 is a schematic perspective view of a second aluminum shell according to a first embodiment of the present invention;
FIG. 17 is an enlarged partial schematic view at D of FIG. 16;
FIG. 18 is a schematic view of a partial cross-sectional structure of a first class aluminum shell and a second class aluminum shell after being mated according to a first embodiment of the present invention;
FIG. 19 is an enlarged partial schematic view at E of FIG. 18;
FIG. 20 is an enlarged partial schematic view at F of FIG. 18;
FIG. 21 is a partial cross-sectional view taken at G-G of FIG. 5;
FIG. 22 is a schematic perspective view of a second embodiment of the present invention after bending the connecting sheet;
fig. 23 is a partial sectional view at H-H in fig. 22.
The reference numbers in the figures illustrate: 1. a core assembly; 11. a roll core body; 12. a positive tab; 13. a negative tab; 2. a connector piece assembly; 21. a positive electrode connecting sheet; 22. a negative electrode connecting sheet; 23. bending the stress hole; 24. a boss; 3. a cover plate assembly; 31. a substrate; 32. an insulating sheet; 33. a positive post; 34. a negative pole post; 35. a positive electrode protection chip; 36. a negative electrode protection chip; 37. a liquid injection hole; 38. an explosion-proof valve; 39. a substrate step groove; 4. an insulating tape; 5. an insulating film; 6. an aluminum housing assembly; 61. a class of aluminum housings; 62. a class II aluminum shell; 63. aluminum hull step groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
referring to fig. 1 to 8, the lithium battery structure disclosed by the invention comprises two winding core assemblies 1, a connecting sheet assembly 2, a cover plate assembly 3, an insulating tape 4, an insulating film 5 and an aluminum shell assembly 6; roll up core assembly 1 and connection piece assembly 2 fixed connection, connection piece assembly 2 and apron subassembly 3 fixed connection, insulating sticky tape 4 covers in the junction of rolling up core assembly 1 and connection piece assembly 2, and insulating film 5 covers outside a plurality of core assemblies 1, and a plurality of core assemblies 1, connection piece assembly 2, insulating sticky tape 4 and insulating film 5 all arrange in aluminium shell subassembly 6, aluminium shell subassembly 6 and apron subassembly 3 fixed connection.
Referring to fig. 9, the winding core assembly 1 includes a winding core body 11 and tabs including a positive tab 12 and a negative tab 13; the positive tab 12 and the negative tab 13 are respectively fixed on two ends of the same end face of the winding core body 11 through welding; in the present embodiment, the winding core assembly 1 is a winding type battery cell, but it may also be a lamination type battery cell, a winding-lamination type battery cell, or other types of battery cells, and the present invention does not limit the specific forming manner of the winding core assembly 1; meanwhile, in the present embodiment, positive tab 12 is formed by stacking a plurality of aluminum foils, and negative tab 13 is formed by stacking a plurality of copper foils.
Referring to fig. 10 and 11, the connecting piece assembly 2 includes a connecting piece including a positive connecting piece 21 and a negative connecting piece 22, a bending stress hole 23, and a boss 24; the connecting sheet is a sheet rectangle, and is provided with two rows of bending stress holes 23 which are parallel to each other, so that the connecting sheet is convenient to bend; the connecting piece is also fixedly connected with a boss 24, the boss 24 is positioned on the front surface of the connecting piece, and the boss 24 is positioned between the two rows of bending stress holes 23; in this embodiment, the positive connection piece 21 and the negative connection piece 22 have the same structure and are made of conductive metal, the positive connection piece 21 and the boss 24 thereon are made of aluminum, and the negative connection piece 22 and the boss 24 thereon are made of copper.
Referring to fig. 2, 10 to 13, the cover plate assembly 3 includes a substrate 31, an insulating sheet 32, a pole column including a positive pole post 33 and a negative pole post 34, a protection tab including a positive protection tab 35 and a negative protection tab 36, a liquid injection hole 37, an explosion-proof valve 38, and a substrate step groove 39; two ends of the substrate 31 are respectively provided with a through hole, and the insulating sheet 32 covers the back of the substrate 31; referring to fig. 13, the cross section of the insulating sheet 32 at the through holes at the two ends of the substrate 31 is an i-shaped structure, the upper end of the insulating sheet 32 covers the front surface of the substrate 31, the lower end of the insulating sheet covers the back surface of the substrate 31, the middle part of the insulating sheet is a through structure, and the through structure in the middle part is arranged coaxially with the through holes on the substrate 31; the positive pole column 33 and the negative pole column 34 are respectively fixed on the insulating sheets 32 on the front surfaces of the two ends of the substrate 31, the positive pole column 33 and the negative pole column 34 are respectively provided with a pole column hole, the pole column hole and the penetrating structure on the insulating sheet 32 are coaxially arranged, the boss 24 on the connecting piece assembly 2 sequentially penetrates through the penetrating structure in the middle of the insulating sheet 32, the through hole on the substrate 31 and the pole column hole on the pole column, and the boss 24 and the pole column are welded and fixed; the connecting sheet assembly 2 is fixed on the cover plate assembly 3 through the boss 24, and the insulating sheet 32 is used for separating the connecting sheet from the substrate 31 and the substrate 31 from the pole, so that the short circuit caused by mutual conduction between the positive connecting sheet 21 and the negative connecting sheet 22 is avoided, and the short circuit caused by mutual conduction between the positive pole 33 and the negative pole 34 is also avoided; the insulating sheet 32, the substrate 31 and the pole are obtained by integral injection molding, and the pole hole is also a through hole.
Referring to fig. 10, 11 and 12, the insulating sheet 32 is further provided with a plurality of vent holes for reducing the weight of the insulating sheet 32 to increase the energy density of the battery, and for smoothly discharging the gas generated inside the battery to the explosion-proof valve 38; a liquid injection hole 37 and an explosion-proof valve 38 are formed between the two poles on the substrate 31; meanwhile, a base plate step groove 39 is formed at the edge of the back surface of the base plate 31; in this embodiment, the substrate 31 and the terminal are both made of conductive metal, and the insulating sheet 32 is made of non-conductive non-metallic material; the positive electrode tab 33 is made of aluminum, and the negative electrode tab 34 is made of copper.
Referring to fig. 1 and 2, the length direction of the connecting piece is perpendicular to the length direction of the substrate 31, two ends of the connecting piece in the length direction are respectively fixed to tabs on the two winding core assemblies 1, the positive tab 12 is placed between the positive connecting piece 21 and the positive protection tab 35, the negative tab 13 is placed between the negative connecting piece 22 and the negative protection tab 36, and then the tabs, the connecting piece and the protection tabs are respectively welded and fixed together, wherein the invention is not limited to a specific welding mode, but the preferred welding mode is ultrasonic welding; the protection small piece is a thin metal piece, and the anode protection small piece 36 and the cathode protection small piece 36 are made of aluminum and copper respectively; if the small protective pieces are not arranged, the welding strength of the tab and the connecting piece is poor, and the tab and the connecting piece are easy to separate.
Referring to fig. 3 and 4, the front surface of the connecting sheet is bonded to the tab by an insulating tape 4, and the back surface of the connecting sheet is bonded to the tab and the protective tab by an insulating tape 4, so as to prevent residual dust in the welding area from diffusing into the winding core body 11 in the subsequent assembly process after the welding of the connecting sheet, the tab and the protective tab is completed, thereby preventing the short circuit of the battery.
Referring to fig. 6 and 7, the insulation film 5 is coated on the winding core assembly 1, and the insulation film 5 is coated outside the two winding core bodies 11, so that on one hand, the two winding core bodies 11 are fixed together, which is convenient for the cover plate assembly 3 and the tab to be stable, and is also convenient for the subsequent winding core assembly 1 to be moved; on the other hand, the damage of the roll core assembly 1 in the shell entering process is prevented.
Referring to fig. 8, 14 to 20, the aluminum shell assembly 6 includes a first-type aluminum shell 61 and a second-type aluminum shell 62, wherein the first-type aluminum shell 61 and the second-type aluminum shell 62 are both provided with aluminum shell stepped grooves 63; the aluminum case stepped groove 63 of the first-type aluminum case 61 and the aluminum case stepped groove 63 of the second-type aluminum case 62 are fitted to each other and fixed by laser welding, and in addition, the aluminum case stepped groove 63 of the first-type aluminum case 61 and the aluminum case stepped groove 63 of the second-type aluminum case 62 are fitted to the substrate stepped groove 39 of the substrate 31, respectively, and fixed by laser welding.
The assembly method of the lithium battery structure comprises the following assembly steps:
s1: as shown in fig. 10 to 13, the boss 24 on the connecting plate assembly 2 and the pole on the cover plate assembly 3 are fixed together by welding, and as shown in fig. 1 and 2, the connecting plate on the connecting plate assembly 2 and the pole on the winding core assembly 1 are fixed together by welding;
s2: as shown in fig. 3 and 4, an insulating adhesive tape 4 is attached to the place where the front surface of the connecting sheet is welded with the tab, and then the insulating adhesive tape 4 is attached to the place where the back surface of the connecting sheet is welded with the tab and the small protection piece;
s3: as shown in fig. 5 and 21, both ends of the positive connection piece 21 and the negative connection piece 22 are bent 90 degrees along the two rows of bending stress holes 23 toward the back surface of the cover plate assembly 3, and at this time, the core assembly 1 is also bent 90 degrees toward the back surface of the cover plate assembly 3 along with the bending of the connection pieces; then, the position of the tab is unchanged, and the winding core body 11 is bent by 90 degrees along the position where the winding core body is contacted with the tab towards the front direction of the cover plate component 3; at this time, both positive tab 12 and negative tab 13 are in a stretched state;
s4: as shown in fig. 6 and 7, the insulating film 5 is coated outside the two core bodies 11;
s5: as shown in fig. 8 to 20, the core assembly 1, the connecting tab assembly 2, the cover plate assembly 3, the insulating tape 4 and the insulating film 5 are put together into the aluminum shell assembly 6, and then the first-type aluminum shell 61, the second-type aluminum shell 62 and the base plate 31 are fixed at the matching gaps by laser welding.
Example two:
referring to fig. 22 and 23, the same as the first embodiment except that the number of the winding core assemblies 1 is four in the present embodiment; in this embodiment, two positive electrode tabs 12 and two negative electrode tabs 13 of two roll core assemblies 1 are respectively tightly attached together, then the two tabs are placed between the connecting piece and the protection small piece, and then the two tabs, the connecting piece and the protection small piece are fixed by welding.
Referring to fig. 1 to 23, an assembling method of a lithium battery structure disclosed in the present embodiment is the same as that of the first embodiment except for steps S3 and S4;
s3: as shown in fig. 22 and 23, the same end of the positive electrode connecting piece 21 and the negative electrode connecting piece 22 is firstly bent 90 degrees along the bending stress hole 23 toward the back direction of the cover plate assembly 3, at this time, both the two winding core assemblies 1 are also bent 90 degrees along with the bending of the connecting pieces toward the back direction of the cover plate assembly 3, and then, the positions of the tabs are unchanged, and the two winding core bodies 11 are bent 90 degrees along the positions of the winding core bodies contacting the tabs toward the front direction of the cover plate assembly 3; finally, the other ends of the anode connecting piece 21 and the cathode connecting piece 22 and the other two winding core assemblies 1 on the anode connecting piece and the cathode connecting piece are repeated; positive electrode tab 12 and negative electrode tab 13 are both in a stretched state at this time.
S4: the insulating film 5 is coated outside the four winding core bodies 11.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. A lithium battery structure characterized by: comprises a plurality of winding core assemblies (1), a connecting piece assembly (2), a cover plate assembly (3) and an aluminum shell assembly (6); the winding core assembly (1) comprises a tab, the connecting piece assembly (2) comprises a boss (24) and a bending stress hole (23), and the cover plate assembly (3) comprises a pole; the pole column is provided with a pole column hole, the connecting piece assembly (2) and the cover plate assembly (3) are fixed through the lug boss (24) and the pole column hole in the pole column, the connecting piece assembly (2) is fixed with the pole lug on the roll core assembly (1), and the connecting piece assembly (2) is bent through the bending stress hole (23); the plurality of winding core assemblies (1) and the connecting piece assemblies (2) are arranged in the aluminum shell assembly (6) together, and the aluminum shell assembly (6) is fixed with the cover plate assembly (3).
2. A lithium battery cell construction in accordance with claim 1, wherein: the winding core assembly (1) further comprises a winding core body (11), and the tabs comprise positive tabs (12) and negative tabs (13); the positive tab (12) and the negative tab (13) are fixed at two ends of the same end face of the winding core body (11).
3. A lithium battery cell construction according to claim 2, characterized in that: the connecting piece assembly (2) further comprises a connecting piece, and the connecting piece comprises a positive connecting piece (21) and a negative connecting piece (22); two rows of bending stress holes (23) which are parallel to each other are formed in the connecting piece, the boss (24) is fixed on the front face of the connecting piece, the boss (24) is located between the two rows of bending stress holes (23), and the positive connecting piece and the negative connecting piece (22) are identical in structure; the two ends of the positive electrode connecting piece (21) are respectively fixed with the positive electrode lugs (12), and the two ends of the negative electrode connecting piece (22) are respectively fixed with the negative electrode lugs (13).
4. A lithium battery cell construction according to claim 3, characterized in that: the cover plate assembly (3) further comprises a substrate (31), an insulating sheet (32), a protection small piece, a liquid injection hole (37), an explosion-proof valve (38) and a substrate step groove (39), the pole comprises a positive pole column (33) and a negative pole column (34), and the protection small piece comprises a positive protection small piece (35) and a negative protection small piece (36);
the two ends of the base plate (31) are respectively provided with a through hole, the insulating sheet (32) covers the back surface of the base plate (31), the cross section of the insulating sheet (32) at the through hole is in an I-shaped structure, the upper end of the insulating sheet (32) covers the front surface of the base plate (31), the lower end of the insulating sheet covers the back surface of the base plate (31), the middle part of the insulating sheet is a penetrating structure, and the penetrating structure and the through holes are coaxially arranged; the positive pole column (33) and the negative pole column (34) are respectively fixed on the insulating sheets (32) on the front surfaces of the two ends of the substrate (31), a pole column hole is respectively formed in each of the positive pole column (33) and the negative pole column (34), and the pole column holes and the penetrating structures are coaxially arranged;
the insulating sheet (32) is also provided with a plurality of vent holes, and the base plate (31) is provided with the liquid injection hole (37) and the explosion-proof valve (38); meanwhile, the edge of the back surface of the base plate (31) is also provided with the base plate step groove (39); the boss (24) on the connecting plate assembly (2) sequentially penetrates through the penetrating structure in the middle of the insulating sheet (32), the through hole in the substrate (31) and the pole column hole in the pole column, and the boss (24) and the pole column are fixed;
the length direction of connection piece with the length direction of base plate (31) is perpendicular, connection piece length direction's both ends respectively with utmost point ear on rolling up core assembly (1) is fixed, anodal ear (12) are placed anodal connection piece (21) with between anodal protection small piece (35), negative pole ear (13) are placed negative pole connection piece (22) with between negative pole protection small piece (36).
5. A lithium battery cell construction according to claim 4, characterized in that: the aluminum shell assembly (6) comprises a first-class aluminum shell (61), a second-class aluminum shell (62) and an aluminum shell stepped groove (63); the first-class aluminum shell (61) and the second-class aluminum shell (62) are both provided with the aluminum shell stepped grooves (63); the aluminum shell stepped groove (63) on the first-class aluminum shell (61) and the aluminum shell stepped groove (63) on the second-class aluminum shell (62) are mutually matched and fixed; the aluminum shell step groove (63) on the first-class aluminum shell (61) and the aluminum shell step groove (63) on the second-class aluminum shell (62) are respectively matched and fixed with the substrate step groove (39) on the substrate (31).
6. A lithium battery cell construction according to claim 4, characterized in that: the lithium battery structure further comprises an insulating tape (4); and pasting the insulating adhesive tape (4) on the position where the front side of the connecting sheet is fixed with the tab, and pasting the insulating adhesive tape (4) on the position where the back side of the connecting sheet is fixed with the tab and the small protection sheet.
7. A lithium battery cell construction in accordance with claim 1, wherein: the lithium battery structure further comprises an insulating film (5); the insulating film (5) is coated on the winding core assembly (1).
8. A lithium battery cell construction in accordance with claim 1, wherein: the number of the roll core assemblies (1) is two or four.
9. A method of assembling a lithium battery cell construction according to any of claims 1-8, characterized in that: when roll up core assembly (1) quantity and be two, the both ends of connection piece respectively with one roll up on core assembly (1) utmost point ear is fixed, and the assembly step is as follows:
s1: fixing the lug boss (24) on the connecting sheet assembly (2) and the pole column hole on the cover plate assembly (3) together by welding, and then fixing the connecting sheet on the connecting sheet assembly (2) and the pole lug on the winding core assembly (1) together by welding;
s2: attaching the insulating adhesive tape (4) to the welding position of the front surface of the connecting sheet and the tab, and attaching the insulating adhesive tape (4) to the welding position of the back surface of the connecting sheet, the tab and the small protection sheet;
s3: bending the two ends of the positive connecting piece (21) and the negative connecting piece (22) by 90 degrees towards the back direction of the cover plate assembly (3) along the two rows of bending stress holes (23), and bending the roll core assembly (1) by 90 degrees towards the back direction of the cover plate assembly (3) along with the bending of the connecting pieces; then, the position of the tab is unchanged, and the winding core body (11) is bent by 90 degrees along the position where the winding core body is contacted with the tab towards the front direction of the cover plate assembly (3); at the moment, the positive electrode tab (12) and the negative electrode tab (13) are both in a stretching state;
s4: coating the insulating film (5) outside the two winding core bodies (11);
s5: and (2) putting the winding core assembly (1), the connecting piece assembly (2), the cover plate assembly (3), the insulating adhesive tape (4) and the insulating film (5) into the aluminum shell assembly (6) together, and then fixing the first-class aluminum shell (61), the second-class aluminum shell (62) and the base plate (31) at the matched gap by laser welding.
10. A method of assembling a lithium battery cell construction according to any of claims 1-8, characterized in that: when roll up core assembly (1) quantity and be four, the both ends of connection piece respectively with two roll up on core assembly (1) utmost point ear is fixed, and the assembly step is as follows:
s1: fixing the lug boss (24) on the connecting sheet assembly (2) and the pole column hole on the cover plate assembly (3) together by welding, and then fixing the connecting sheet on the connecting sheet assembly (2) and the pole lug on the winding core assembly (1) together by welding;
s2: attaching the insulating adhesive tape (4) to the welding position of the front surface of the connecting sheet and the tab, and attaching the insulating adhesive tape (4) to the welding position of the back surface of the connecting sheet, the tab and the small protection sheet;
s3: the same end of the positive connecting piece (21) and the same end of the negative connecting piece (22) are bent by 90 degrees towards the back direction of the cover plate assembly (3) along the bending stress hole (23), at the moment, the two winding core assemblies (1) are also bent by 90 degrees towards the back direction of the cover plate assembly (3) along with the bending of the connecting pieces, then, the positions of the tabs are unchanged, and the two winding core bodies (11) are bent by 90 degrees towards the front direction of the cover plate assembly (3) along the positions where the winding core bodies are in contact with the tabs; finally, the other ends of the positive electrode connecting piece (21) and the negative electrode connecting piece (22) and the other two winding core assemblies (1) on the positive electrode connecting piece and the negative electrode connecting piece are repeated; at the moment, the positive electrode tab (12) and the negative electrode tab (13) are both in a stretching state;
s4: coating the insulating film (5) outside the four winding core bodies (11);
s5: and (2) putting the winding core assembly (1), the connecting piece assembly (2), the cover plate assembly (3), the insulating adhesive tape (4) and the insulating film (5) into the aluminum shell assembly (6) together, and then fixing the first-class aluminum shell (61), the second-class aluminum shell (62) and the base plate (31) at the matched gap by laser welding.
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| CN114156527B (en) | 2024-01-26 |
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