CN114156527B - Lithium battery structure and assembly method thereof - Google Patents
Lithium battery structure and assembly method thereof Download PDFInfo
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- CN114156527B CN114156527B CN202111469751.4A CN202111469751A CN114156527B CN 114156527 B CN114156527 B CN 114156527B CN 202111469751 A CN202111469751 A CN 202111469751A CN 114156527 B CN114156527 B CN 114156527B
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- assembly
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- winding core
- pole
- cover plate
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004804 winding Methods 0.000 claims abstract description 140
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 92
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 92
- 238000005452 bending Methods 0.000 claims abstract description 47
- 239000000306 component Substances 0.000 claims abstract description 37
- 239000008358 core component Substances 0.000 claims abstract description 34
- 230000000712 assembly Effects 0.000 claims abstract description 15
- 238000000429 assembly Methods 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims description 79
- 239000000758 substrate Substances 0.000 claims description 43
- 239000002390 adhesive tape Substances 0.000 claims description 27
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 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 6
- 238000000576 coating method Methods 0.000 claims description 6
- 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 3
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000036961 partial effect Effects 0.000 description 7
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
Landscapes
- 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, and relates to the technical field of lithium ion batteries; the aluminum shell comprises a plurality of winding core assemblies, a cover plate assembly, a connecting sheet assembly and an aluminum shell assembly; the winding core component comprises a pole lug, the connecting piece component comprises a boss and a bending stress hole, and the cover plate component comprises a pole post; the pole is provided with a pole hole, the connecting piece assembly is fixed with the cover plate assembly through a boss and the pole hole on the pole, the connecting piece assembly is fixed with the pole lug on the winding core assembly, and the connecting piece assembly is subjected to bending stress Kong Shewan; the plurality of winding core components and the connecting sheet components are arranged in the aluminum shell component together, and the aluminum shell component is fixed with the cover plate component; the invention provides a lithium battery structure and an assembly method thereof, which can solve the problem that a large amount of metal dust generated when a connecting sheet and a cover plate are welded in the prior art enters the interior of a winding core to cause short circuit of a lithium battery 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 assembly method at present comprises the following steps: (1) the two single winding cores are connected together by adopting a butterfly welding process, namely two pole ears with the same polarity are welded together by utilizing ultrasonic waves through connecting sheets; (2) welding the connecting sheet with the corresponding polar posts with the same polarity on the cover plate through laser, and buckling a stop frame at the welding position; (3) combining the two single roll cores and fixing the two single roll cores through binding adhesive tapes; (4) and plugging the battery cell into the aluminum shell, and completing 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 is generated, and the welding positions are close to the opening of the winding core, so that the metal dust is easy to enter the winding core, and the lithium battery is scrapped after short circuit;
2. the manufacturing process is complex, a plurality of processes such as ultrasonic welding of the electrode lug, laser welding of the connecting sheet, buckling of the stop rack, core closing and the like are required, and in the laser welding process of the connecting sheet, the positioning of the winding core and the connecting sheet is not easy to realize, so that the qualification rate and the utilization rate of manufacturing are reduced;
3. in the core closing process, the alignment degree of the two single winding cores is not easy to control, the positive electrode lug and the negative electrode lug are easy to break when being bent, the risk of being reversely inserted into the winding cores is easy to occur, when the number of winding cores of the single lithium battery is increased, the defect of bending the electrode lugs is more obvious, and the process application is greatly limited;
4. because a mode that a set of aluminum shell is used for configuring a set of cover plate is adopted, the scheme can not effectively improve the energy density of the lithium battery and reduce the manufacturing cost, so that the manufacturing is in a bottleneck.
The publication number CN208368654U discloses a core closing device of a lithium battery, and the background technology indicates that the current core assembly process of the lithium ion battery is as follows: A. the pole lugs of the winding core B are respectively pre-welded by an ultrasonic welding machine; A. b, after the winding cores are matched, welding the electrode lugs, the gaskets and the connecting sheets together by using an ultrasonic welding machine; welding the gasket and the cover plate together by using a laser welding machine; A. and B, core closing and encapsulation are carried out on the core. This process is also known as butterfly welding.
Although the device disclosed by the patent can effectively improve the manufacturing efficiency and quality through the functions of positioning the battery cell, compressing the cover plate and synchronously closing the battery cell, and effectively avoid the risks of tab breakage and battery cell short circuit rejection caused by closing the battery cell; however, the device does not improve the butterfly welding process and cannot solve the fundamental problem proposed 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 of ordinary skill in the art.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the problem of short circuit of the lithium battery caused by a large amount of metal dust generated when the connecting sheet and the cover plate are welded in the prior art after entering the winding core, and how to improve the energy density of the lithium battery.
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 components, a cover plate component, a connecting sheet component and an aluminum shell component; 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 post; the pole is provided with a pole hole, the connecting piece assembly is fixed with the cover plate assembly through the boss and the pole hole on the pole, the connecting piece assembly is fixed with the pole lug on the winding core assembly, and the connecting piece assembly is subjected to bending stress Kong Shewan; the plurality of winding core components and the connecting sheet component are installed in the aluminum shell component together, and the aluminum shell component is fixed with the cover plate component.
Compared with the structure of the traditional lithium battery, the invention converts the large-area laser welding of the connecting sheet component and the cover plate component into the laser welding of the lug boss and the pole hole on the pole, and the welding position of the lug boss and the pole hole is far away from the opening of the winding core component, so that metal dust generated in the laser welding process can be effectively prevented from entering the winding core component, and the risk of short circuit of the lithium battery is avoided; meanwhile, the plurality of winding core components are combined into one aluminum shell component after being bent through the bending stress holes on the connecting sheet component, and only one cover plate component is needed; in the traditional lithium battery structure, each winding core component is required to be provided with an aluminum shell component and a cover plate component; therefore, the lithium battery structure disclosed by the invention not only can save the consumption of the cover plate component, reduce the cost and 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 tab comprises a positive tab and a negative tab; the positive electrode lug and the negative electrode lug are fixed on 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; two rows of bending stress holes which are parallel to each other are formed in the connecting sheet, the boss is fixed on the front face of the connecting sheet, the boss is positioned in the middle of the two rows of bending stress holes, and the positive electrode connecting sheet and the negative electrode connecting sheet have the same structure; the two ends of the positive electrode connecting sheet are respectively fixed with the positive electrode lugs, and the two ends of the negative electrode connecting sheet are respectively fixed with the negative electrode lugs.
Preferably, the cover plate assembly further comprises a substrate, an insulating sheet, a protective small sheet, a liquid injection hole, an explosion-proof valve and a substrate step groove, wherein the polar column comprises a positive polar column and a negative polar column, and the protective small sheet comprises a positive protective small sheet and a negative protective small sheet;
the two ends of the substrate are respectively provided with a through hole, the insulating sheet covers the back surface of the substrate, the cross section of the insulating sheet at the through holes is in an I-shaped structure, the upper end of the insulating sheet covers the front surface of the substrate, the lower end of the insulating sheet covers the back surface 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 and the negative pole are respectively fixed on the insulating sheets on the front surfaces of the two ends of the substrate, a pole hole is respectively formed in the positive pole and the negative pole, and the pole hole and the penetrating structure 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 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 on the substrate and the pole hole on the pole, and the boss is fixed with the pole;
the length direction of the connecting sheet is perpendicular to the length direction of the substrate, two ends of the length direction of the connecting sheet are respectively fixed with the lugs on the winding core assembly, the positive lugs are placed between the positive connecting sheet and the positive protection small pieces, and the negative lugs are placed between the negative connecting sheet and the negative protection small pieces.
Preferably, the aluminum shell component comprises a class of aluminum shells, a class of aluminum shells and an aluminum shell step groove; the aluminum shell step grooves are formed in the first aluminum shell and the second aluminum shell; the aluminum shell step grooves on the first class of aluminum shells and the aluminum shell step grooves on the second class of aluminum shells are mutually matched and fixed; the aluminum shell step grooves on the aluminum shells of the first class and the aluminum shell step grooves on the aluminum shells of the second class are respectively matched with and fixed with the substrate step grooves on the substrate.
Preferably, the lithium battery structure further comprises an insulating tape; and sticking the insulating adhesive tape to the position where the front surface of the connecting sheet is fixed with the tab, and sticking the insulating adhesive tape to the position where the back surface of the connecting sheet is fixed with the tab and the protection small piece.
Preferably, the lithium battery structure further includes an insulating film; the insulating film is coated on the winding core component.
Preferably, the number of the winding core components is two or four.
The invention also discloses an assembling method adopting the lithium battery structure, when the number of the winding core components is two, two ends of the connecting sheet are respectively fixed with the pole lugs on one winding core component, and the assembling steps are as follows:
s1: fixing the lug boss on the connecting sheet assembly and the pole post hole on the cover plate assembly together through welding, and fixing the connecting sheet on the connecting sheet assembly and the pole lug on the winding core assembly together through welding;
s2: attaching the insulating adhesive tape to the welding place of the front surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape to the welding place of the back surface of the connecting sheet, the electrode lug and the protection small piece;
s3: bending both ends of the positive electrode connecting sheet and the negative electrode connecting sheet by 90 degrees along two rows of bending stress holes towards the back direction of the cover plate assembly, wherein the winding core assembly is bent by 90 degrees along with bending of the connecting sheet towards the back direction of the cover plate assembly; then, the position of the tab is unchanged, and the winding core body is bent for 90 degrees towards the front direction of the cover plate assembly along the contact position of the winding core body and the tab; at this time, the positive electrode lug and the negative electrode lug are both in a stretched state;
s4: coating the insulating films on the outer parts of the two winding core bodies;
s5: the winding core assembly, the connecting sheet assembly, the cover plate assembly, the insulating adhesive tape and the insulating film are placed into the aluminum shell assembly together, and then the matched gaps of the aluminum shells of the first class, the aluminum shells of the second class and the base plate are fixed through laser welding.
The invention also discloses another assembling method adopting a lithium battery structure, when the number of the winding core components is four, two ends of the connecting sheet are respectively fixed with the pole lugs on the two winding core components, and the assembling steps are as follows:
s1: fixing the lug boss on the connecting sheet assembly and the pole post hole on the cover plate assembly together through welding, and fixing the connecting sheet on the connecting sheet assembly and the pole lug on the winding core assembly together through welding;
s2: attaching the insulating adhesive tape to the welding place of the front surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape to the welding place of the back surface of the connecting sheet, the electrode lug and the protection small piece;
s3: firstly bending the same ends of the positive electrode connecting sheet and the negative electrode connecting sheet by 90 degrees along the bending stress hole towards the back direction of the cover plate assembly, bending both the winding core assemblies by 90 degrees along the bending direction of the connecting sheet towards the back direction of the cover plate assembly, and bending both the winding core bodies by 90 degrees along the contact position of the winding core bodies and the electrode lugs towards the front direction of the cover plate assembly, wherein the positions of the electrode lugs are unchanged; finally, repeating the steps above for the other end of the positive electrode connecting sheet and the negative electrode connecting sheet and the other two winding core components thereon; at this time, the positive electrode lug and the negative electrode lug are both in a stretched state;
s4: coating the insulating films on the outer parts of the four winding core bodies;
s5: the winding core assembly, the connecting sheet assembly, the cover plate assembly, the insulating adhesive tape and the insulating film are placed into the aluminum shell assembly together, and then the matched gaps of the aluminum shells of the first class, the aluminum shells of the second class and the base plate are fixed through laser welding.
Therefore, the invention has the advantages that:
1. compared with the structure of the traditional lithium battery, the invention converts the large-area laser welding of the connecting sheet component and the cover plate component into the laser welding of the lug boss and the pole hole on the pole, and the welding position of the lug boss and the pole hole is far away from the opening of the winding core component, so that metal dust generated in the laser welding process can be effectively prevented from entering the winding core component, and the risk of short circuit of the lithium battery is avoided; meanwhile, the plurality of winding core components are combined into one aluminum shell component after being bent through the bending stress holes on the connecting sheet component, and only one cover plate component is needed; in the traditional lithium battery structure, each winding core component is required to be provided with an aluminum shell component and a cover plate component; therefore, the lithium battery structure disclosed by the invention not only can save the consumption of the cover plate component, reduce the cost and 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 invention adopts the tabs with shorter length, and the tabs in the invention are in a stretching state, so that the risk of reverse insertion of the tabs can be avoided; in the conventional method, the assembly relation between the winding core component and the cover board component needs to be considered, so that the risk of pulling and breaking the tab during core closing exists after the winding core component is directly assembled on the cover board component, and the winding core component is not directly connected with the cover board component, thereby avoiding the risk.
3. Compared with the traditional lithium battery structure, the invention can realize the assembly operation of double winding cores and four winding cores of the lithium battery, has wide compatible range and greatly improves the process adaptability; the manufacturing process of the invention is simpler, a plurality of processes such as laser welding of the connecting sheet, buckling of the stop frame, core closing 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 manufacturing.
4. According to the invention, the connecting sheets are separated from the substrate and the polar posts by adopting the insulating sheets, so that the connecting sheets are prevented from being conducted mutually to cause short circuit, and the polar posts are prevented from being conducted mutually to cause short circuit; 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 smoothly discharge gas generated in the battery to the explosion-proof valve; the invention also adopts a protective small piece, so that the welding strength of the tab and the connecting piece is ensured; according to the invention, the insulating adhesive tape is adopted to prevent residual dust in a welding area from diffusing into the winding core body in the subsequent assembly process after the welding of the connecting sheet, the electrode lug and the protective small piece is finished, so that the short circuit of the battery is avoided; the insulating film adopted by the invention can fix the two winding core bodies together, is convenient for stabilizing the cover plate assembly and the electrode lug form, is convenient for transferring the subsequent winding core assembly, and can prevent the winding core assembly from being damaged in the process of entering the shell.
Drawings
FIG. 1 is a schematic view of a front perspective view of a winding core assembly, a connecting piece assembly and a cover assembly welded together in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a back perspective view of a winding core assembly, a connecting piece assembly and a cover assembly welded together according to an embodiment of the present invention;
FIG. 3 is a schematic front perspective view of a tape-sticking process after welding a winding core assembly, a connecting sheet assembly and a cover plate assembly in accordance with the first embodiment of the present invention;
FIG. 4 is a schematic view of a back side perspective structure of a tape after welding a winding core assembly, a connecting piece assembly and a cover plate assembly according to an embodiment of the present invention;
fig. 5 is a schematic perspective view of a connecting piece after bending in the first embodiment of the invention;
fig. 6 is a schematic perspective view of an insulation film according to the first embodiment of the present invention;
fig. 7 is a schematic perspective view of an insulating film coated according to the first embodiment of the present invention;
FIG. 8 is a schematic perspective view of a winding core assembly according to a first embodiment of the present invention after being assembled into an aluminum housing assembly;
FIG. 9 is a schematic perspective view of a winding core assembly according to an embodiment of the present invention;
FIG. 10 is a schematic front perspective view of a cover plate assembly and a connector assembly mated in accordance with an embodiment of the present invention;
FIG. 11 is a schematic view showing a rear perspective view of a cover plate assembly and a connecting assembly mated in accordance with an embodiment of the present invention;
FIG. 12 is an enlarged partial schematic view at A in FIG. 11;
FIG. 13 is a cross-sectional view at B-B in FIG. 11;
fig. 14 is a schematic perspective view of an aluminum shell according to the first embodiment of the present invention;
FIG. 15 is an enlarged partial schematic view at C in FIG. 14;
fig. 16 is a schematic perspective view of a second type aluminum shell according to the first embodiment of the invention;
FIG. 17 is a partially enlarged schematic view of FIG. 16 at D;
FIG. 18 is a schematic view of a partial cross-sectional structure of a first aluminum shell and a second aluminum shell according to the first embodiment of the invention;
FIG. 19 is an enlarged partial schematic view at E in FIG. 18;
FIG. 20 is an enlarged partial schematic view of F in FIG. 18;
FIG. 21 is a partial cross-sectional view at G-G of FIG. 5;
fig. 22 is a schematic perspective view of a connecting piece after bending in the second embodiment of the present invention;
fig. 23 is a partial cross-sectional view at H-H in fig. 22.
The reference numerals in the figures illustrate: 1. a winding core assembly; 11. a winding core body; 12. a positive electrode tab; 13. a negative electrode ear; 2. a connecting 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 electrode post; 34. a negative electrode column; 35. a positive electrode protection tab; 36. a negative electrode protection tab; 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 shell assembly; 61. an aluminum shell; 62. a second class of aluminum shells; 63. an aluminum shell step groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Embodiment one:
referring to fig. 1 to 8, a lithium battery structure disclosed in the present invention includes 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 case assembly 6; the coil core assembly 1 is fixedly connected with the connecting sheet assembly 2, the connecting sheet assembly 2 is fixedly connected with the cover plate assembly 3, the insulating adhesive tape 4 covers the joint of the coil core assembly 1 and the connecting sheet assembly 2, the insulating film 5 covers the plurality of coil core assemblies 1, the connecting sheet assembly 2, the insulating adhesive tape 4 and the insulating film 5 are all arranged in the aluminum shell assembly 6, and the aluminum shell assembly 6 is fixedly connected with the cover plate assembly 3.
Referring to fig. 9, a winding core assembly 1 includes a winding core body 11 and a tab, the tab including a positive tab 12 and a negative tab 13; the positive electrode lug 12 and the negative electrode lug 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 core, but it may be a lamination type battery core, a winding-lamination type battery core, or other types of battery cores, and the present invention is not limited to a specific molding mode of the winding core assembly 1; meanwhile, in the present embodiment, the positive tab 12 is formed by stacking a plurality of layers of aluminum foil materials, and the negative tab 13 is formed by stacking a plurality of layers of copper foil materials.
Referring to fig. 10 and 11, the connecting piece assembly 2 includes a connecting piece, a bending stress hole 23 and a boss 24, the connecting piece includes a positive connecting piece 21 and a negative connecting piece 22; the connecting sheet is in a laminar rectangular shape, and two rows of mutually parallel bending stress holes 23 are formed in the connecting sheet, 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 two rows of bending stress holes 23; in this embodiment, the positive electrode connecting piece 21 and the negative electrode connecting piece 22 have the same structure and are made of conductive metal, the positive electrode connecting piece 21 and the boss 24 thereon are made of aluminum, and the negative electrode connecting piece 22 and the boss 24 thereon are made of copper.
Referring to fig. 2, 10 to 13, the cap plate assembly 3 includes a base plate 31, an insulating sheet 32, a post including a positive electrode post 33 and a negative electrode post 34, a protective tab including a positive electrode protective tab 35 and a negative electrode protective tab 36, a liquid injection hole 37, an explosion-proof valve 38, and a base plate stepped groove 39; two ends of the substrate 31 are respectively provided with a through hole, and the insulating sheet 32 covers the back surface of the substrate 31; referring to fig. 13, the cross section of the insulating sheet 32 at the through holes at two ends of the substrate 31 is in an i-shaped structure, wherein the upper end of the insulating sheet 32 covers the front surface of the substrate 31, the lower end covers the back surface of the substrate 31, the middle part is a penetrating structure, and the penetrating structure in the middle part is coaxially arranged with the through holes on the substrate 31; the positive pole 33 and the negative pole 34 are respectively fixed on the insulating sheets 32 on the front surfaces of the two ends of the substrate 31, a pole hole is respectively formed on the positive pole 33 and the negative pole 34, the pole hole and the penetrating structure on the insulating sheets 32 are coaxially arranged, the boss 24 on the connecting sheet assembly 2 sequentially penetrates through the penetrating structure in the middle of the insulating sheets 32, the through hole on the substrate 31 and the pole hole on the pole, and the boss 24 and the pole 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 has the function of separating the connecting sheet from the base plate 31 and the base plate 31 from the pole, so that the short circuit caused by mutual conduction between the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22 is avoided, and the short circuit caused by mutual conduction between the positive electrode pole 33 and the negative electrode pole 34 is also avoided; the insulating sheet 32, the substrate 31 and the post are obtained by integral injection molding, and the post 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 the purpose of reducing the weight of the insulating sheet 32 to increase the energy density of the battery, and for the purpose of 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 arranged between the two polar posts on the base plate 31; meanwhile, a substrate step groove 39 is formed at the edge of the back surface of the substrate 31; in this embodiment, the substrate 31 and the pole are made of conductive metal, and the insulating sheet 32 is made of non-conductive non-metal; the positive electrode 33 is made of aluminum, and the negative electrode 34 is made of copper.
Referring to fig. 1 and 2, the length direction of the connection piece is perpendicular to the length direction of the substrate 31, two ends of the length direction of the connection piece are respectively fixed with the tabs on the two winding core assemblies 1, the positive tab 12 is placed between the positive connection piece 21 and the positive protection tab 35, the negative tab 13 is placed between the negative connection piece 22 and the negative protection tab 36, and then the tab, the connection piece and the protection tab 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 protective small piece is a thin metal piece, and the materials of the positive electrode protective small piece 36 and the negative electrode protective small piece are aluminum and copper respectively; if the small protection piece is 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, an insulating tape 4 is attached to a welding place between the front surface of the connecting piece and the tab, and then an insulating tape 4 is attached to a welding place between the back surface of the connecting piece and the tab and a protective small piece, so as to prevent residual dust in a welding area from diffusing into the winding core body 11 in a subsequent assembly process after the welding of the connecting piece, the tab and the protective small piece is completed, thereby avoiding short circuit of the battery.
Referring to fig. 6 and 7, the insulating film 5 is coated on the winding core assembly 1, and the insulating 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, thereby being convenient for stabilizing the shapes of the cover plate assembly 3 and the tab and also being convenient for transferring the subsequent winding core assembly 1; on the other hand, prevents the winding core assembly 1 from being damaged during the process of being cased.
Referring to fig. 8, 14-20, the aluminum shell assembly 6 includes a first aluminum shell 61 and a second aluminum shell 62, wherein the first aluminum shell 61 and the second aluminum shell 62 are provided with aluminum shell step grooves 63; the aluminum case step grooves 63 on the first aluminum case 61 and the aluminum case step grooves 63 on the second aluminum case 62 are mutually matched and fixed by laser welding, and in addition, the aluminum case step grooves 63 on the first aluminum case 61 and the aluminum case step grooves 63 on the second aluminum case 62 are respectively matched and fixed by laser welding with the substrate step grooves 39 on the substrate 31.
The assembling method of the lithium battery structure comprises the following assembling steps:
s1: as shown in fig. 10 to 13, the boss 24 on the connecting piece assembly 2 and the pole post on the cover plate assembly 3 are fixed together by welding, and as shown in fig. 1 and 2, the connecting piece on the connecting piece assembly 2 and the pole lug on the winding core assembly 1 are fixed together by welding;
s2: as shown in fig. 3 and 4, an insulating tape 4 is attached to the welding place of the front surface of the connecting sheet and the tab, and then an insulating tape 4 is attached to the welding place of the back surface of the connecting sheet, the tab and the protection small sheet;
s3: as shown in fig. 5 and 21, both ends of the positive electrode connecting piece 21 and the negative electrode connecting piece 22 are bent by 90 degrees along two rows of bending stress holes 23 towards the back of the cover plate assembly 3, and at this time, the winding core assembly 1 is also bent by 90 degrees towards the back of the cover plate assembly 3 along with bending of the connecting pieces; then, the position of the tab is unchanged, and the winding core body 11 is bent for 90 degrees towards the front direction of the cover plate assembly 3 along the contact position of the winding core body and the tab; at this time, both the positive electrode tab 12 and the negative electrode tab 13 are in a stretched state;
s4: as shown in fig. 6 and 7, the insulating film 5 is coated on the outside of the two winding core bodies 11;
s5: as shown in fig. 8 to 20, the winding core assembly 1, the connecting sheet assembly 2, the cover plate assembly 3, the insulating tape 4 and the insulating film 5 are put into the aluminum case assembly 6 together, and then the seam between the first aluminum case 61, the second aluminum case 62 and the base plate 31 is fixed by laser welding.
Embodiment two:
referring to fig. 22 and 23, the first embodiment is the same except that the number of winding core components 1 in the present embodiment is four; in this embodiment, the two positive tabs 12 and the two negative tabs 13 of the two winding core assemblies 1 are correspondingly adhered together, then the two tabs are placed between the connecting sheet and the protecting tab, and then the two tabs, the connecting sheet and the protecting tab are fixed by welding.
Referring to fig. 1 to 23, the method for assembling a lithium battery structure disclosed in the present embodiment is the same as the first embodiment, except for steps S3 and S4;
s3: as shown in fig. 22 and 23, the same ends of the positive electrode connecting piece 21 and the negative electrode connecting piece 22 are bent by 90 degrees along the bending stress hole 23 towards the back side of the cover plate assembly 3, at this time, both winding core assemblies 1 are bent by 90 degrees along the bending direction of the connecting piece towards the back side of the cover plate assembly 3, then the positions of the tabs are unchanged, and the two winding core bodies 11 are bent by 90 degrees along the positions of the winding core bodies, which are contacted with the tabs, towards the front side of the cover plate assembly 3; finally, the other ends of the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22 and the other two winding core components 1 thereon repeat the above steps; at this time, both the positive electrode tab 12 and the negative electrode tab 13 are in a stretched state.
S4: the insulating film 5 is coated on the outside of the four winding core bodies 11.
The foregoing embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments, or equivalents may be substituted for parts of the technical features thereof, and the modifications or substitutions may be made without departing from the spirit and scope of the technical solution of the embodiments of the present invention.
Claims (7)
1. A lithium battery structure, characterized in that: the aluminum shell comprises a plurality of winding core assemblies (1), connecting sheet assemblies (2), cover plate assemblies (3), insulating adhesive tapes (4), insulating films (5) and aluminum shell assemblies (6); the winding core assembly (1) comprises a pole lug, the connecting sheet assembly (2) comprises a boss (24) and a bending stress hole (23), and the cover plate assembly (3) comprises a pole post, a base plate (31) and a protection small piece; a pole hole is formed in the pole, the connecting piece assembly (2) is fixed with the cover plate assembly (3) through the boss (24) and the pole hole in the pole, the connecting piece assembly (2) is fixed with the pole lug in the winding core assembly (1), and the connecting piece assembly (2) is bent through the bending stress hole (23); the plurality of winding core components (1) and the connecting sheet components (2) are arranged in the aluminum shell component (6) together, the aluminum shell component (6) is fixed with the cover plate component (3), the winding core component (1) further comprises a winding core body (11), and the electrode lugs comprise positive electrode lugs (12) and negative electrode lugs (13); the positive electrode lug (12) and the negative electrode lug (13) are fixed on two ends of the same end face of the winding core body (11), the connecting piece assembly (2) further comprises a connecting piece, and the connecting piece comprises a positive electrode connecting piece (21) and a negative electrode connecting piece (22); two rows of bending stress holes (23) which are parallel to each other are formed in the connecting sheet, the boss (24) is fixed on the front face of the connecting sheet, the boss (24) is positioned in the middle of the two rows of bending stress holes (23), and the positive electrode connecting sheet and the negative electrode connecting sheet (22) have the same structure; the two ends of the positive electrode connecting sheet (21) are respectively fixed with the positive electrode lug (12), the two ends of the negative electrode connecting sheet (22) are respectively fixed with the negative electrode lug (13), and the aluminum shell assembly (6) comprises a type of aluminum shell (61) and a type of aluminum shell (62);
by adopting the assembly method of the lithium battery structure, when the number of the winding core components (1) is two, two ends of the connecting sheet are respectively fixed with the pole lugs on one winding core component (1), and the assembly steps are as follows:
s1: fixing the lug boss (24) on the connecting sheet assembly (2) and the pole post hole on the cover plate assembly (3) together through welding, and fixing the connecting sheet on the connecting sheet assembly (2) and the pole lug on the winding core assembly (1) together through welding;
s2: attaching the insulating adhesive tape (4) to the welding place of the front surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape (4) to the welding place of the back surface of the connecting sheet, the electrode lug and the protection small piece;
s3: bending both ends of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) by 90 degrees along two rows of bending stress holes (23) towards the back surface direction of the cover plate assembly (3), wherein the winding core assembly (1) is bent by 90 degrees towards the back surface direction of the cover plate assembly (3) along with bending of the connecting sheet; then, the position of the tab is unchanged, and the winding core body (11) is bent for 90 degrees towards the front direction of the cover plate assembly (3) along the contact position of the winding core body and the tab; at this time, both the positive electrode tab (12) and the negative electrode tab (13) are in a stretched state;
s4: coating the insulating film (5) on the outer parts of the two winding core bodies (11);
s5: the winding core assembly (1), the connecting sheet assembly (2), the cover plate assembly (3), the insulating adhesive tape (4) and the insulating film (5) are put into the aluminum shell assembly (6) together, and then the gaps of the aluminum shells (61, 62) and the base plate (31) are fixed through laser welding;
when the number of the winding core components (1) is four, two ends of the connecting sheet are respectively fixed with the pole lugs on the two winding core components (1), and the assembly steps are as follows:
s1: fixing the lug boss (24) on the connecting sheet assembly (2) and the pole post hole on the cover plate assembly (3) together through welding, and fixing the connecting sheet on the connecting sheet assembly (2) and the pole lug on the winding core assembly (1) together through welding;
s2: attaching the insulating adhesive tape (4) to the welding place of the front surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape (4) to the welding place of the back surface of the connecting sheet, the electrode lug and the protection small piece;
s3: firstly bending the same ends of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) by 90 degrees along the bending stress hole (23) towards the back direction of the cover plate assembly (3), bending both the winding core assemblies (1) by 90 degrees along the bending of the connecting sheet towards the back direction of the cover plate assembly (3), and bending both the winding core bodies (11) by 90 degrees along the contact position of the winding core bodies and the electrode lugs towards the front direction of the cover plate assembly (3) along the position of the winding core bodies and the electrode lugs; finally, the other ends of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) and the other two winding core assemblies (1) on the other ends repeat the steps; at this time, both the positive electrode tab (12) and the negative electrode tab (13) are in a stretched state;
s4: coating the insulating films (5) on the outer parts of the four winding core bodies (11);
s5: the winding core assembly (1), the connecting sheet assembly (2), the cover plate assembly (3), the insulating adhesive tape (4) and the insulating film (5) are put into the aluminum shell assembly (6) together, and then the matched gaps of the aluminum shells (61, the aluminum shells (62) and the base plate (31) are fixed through laser welding.
2. A lithium battery structure according to claim 1, wherein: the cover plate assembly (3) further comprises an insulating sheet (32), a liquid injection hole (37), an explosion-proof valve (38) and a substrate step groove (39), the polar column comprises a positive polar column (33) and a negative polar column (34), and the protection small sheet comprises a positive protection small sheet (35) and a negative protection small sheet (36);
the two ends of the substrate (31) are respectively provided with a through hole, the insulating sheet (32) covers the back surface of the substrate (31), the cross section of the insulating sheet (32) at the through holes is in 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 in a penetrating structure, and the penetrating structure and the through holes are coaxially arranged; the positive pole (33) and the negative pole (34) are respectively fixed on the insulating sheets (32) on the front surfaces of the two ends of the substrate (31), a pole hole is respectively formed in the positive pole (33) and the negative pole (34), and the pole hole and the penetrating structure are coaxially arranged;
a plurality of vent holes are further formed in the insulating sheet (32), and the liquid injection hole (37) and the explosion-proof valve (38) are formed in the base plate (31); meanwhile, the edge of the back surface of the substrate (31) is also provided with the substrate step groove (39); the boss (24) on the connecting sheet 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 hole on the pole, and the boss (24) and the pole are fixed;
the length direction of the connecting sheet is perpendicular to the length direction of the substrate (31), two ends of the length direction of the connecting sheet are respectively fixed with the lugs on the winding core assembly (1), the positive lugs (12) are placed between the positive connecting sheet (21) and the positive protection small pieces (35), and the negative lugs (13) are placed between the negative connecting sheet (22) and the negative protection small pieces (36).
3. A lithium battery structure according to claim 2, characterized in that: the aluminum shell step grooves (63) are formed in the first-class aluminum shell (61) and the second-class aluminum shell (62); the aluminum shell step grooves (63) on the first-class aluminum shell (61) and the aluminum shell step grooves (63) on the second-class aluminum shell (62) are mutually matched and fixed; the aluminum shell step grooves (63) on the aluminum shells (61) and the aluminum shell step grooves (63) on the aluminum shells (62) are respectively matched and fixed with the substrate step grooves (39) on the substrate (31).
4. A lithium battery structure according to claim 2, characterized in that: and sticking the insulating adhesive tape (4) to the position where the front surface of the connecting sheet is fixed with the electrode lug, and sticking the insulating adhesive tape (4) to the position where the back surface of the connecting sheet is fixed with the electrode lug and the protection small piece.
5. A lithium battery structure according to claim 1, wherein: the insulating film (5) is coated on the winding core assembly (1).
6. A method of assembling a lithium battery structure according to any one of claims 1-5, characterized in that: when the number of the winding core components (1) is two, two ends of the connecting sheet are respectively fixed with the pole lugs on one winding core component (1), and the assembly steps are as follows:
s1: fixing the lug boss (24) on the connecting sheet assembly (2) and the pole post hole on the cover plate assembly (3) together through welding, and fixing the connecting sheet on the connecting sheet assembly (2) and the pole lug on the winding core assembly (1) together through welding;
s2: attaching the insulating adhesive tape (4) to the welding place of the front surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape (4) to the welding place of the back surface of the connecting sheet, the electrode lug and the protection small piece;
s3: bending both ends of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) by 90 degrees along two rows of bending stress holes (23) towards the back surface direction of the cover plate assembly (3), wherein the winding core assembly (1) is bent by 90 degrees towards the back surface direction of the cover plate assembly (3) along with bending of the connecting sheet; then, the position of the tab is unchanged, and the winding core body (11) is bent for 90 degrees towards the front direction of the cover plate assembly (3) along the contact position of the winding core body and the tab; at this time, both the positive electrode tab (12) and the negative electrode tab (13) are in a stretched state;
s4: coating the insulating film (5) on the outer parts of the two winding core bodies (11);
s5: the winding core assembly (1), the connecting sheet assembly (2), the cover plate assembly (3), the insulating adhesive tape (4) and the insulating film (5) are put into the aluminum shell assembly (6) together, and then the matched gaps of the aluminum shells (61, the aluminum shells (62) and the base plate (31) are fixed through laser welding.
7. A method of assembling a lithium battery structure according to any one of claims 1-5, characterized in that: when the number of the winding core components (1) is four, two ends of the connecting sheet are respectively fixed with the pole lugs on the two winding core components (1), and the assembly steps are as follows:
s1: fixing the lug boss (24) on the connecting sheet assembly (2) and the pole post hole on the cover plate assembly (3) together through welding, and fixing the connecting sheet on the connecting sheet assembly (2) and the pole lug on the winding core assembly (1) together through welding;
s2: attaching the insulating adhesive tape (4) to the welding place of the front surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape (4) to the welding place of the back surface of the connecting sheet, the electrode lug and the protection small piece;
s3: firstly bending the same ends of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) by 90 degrees along the bending stress hole (23) towards the back direction of the cover plate assembly (3), bending both the winding core assemblies (1) by 90 degrees along the bending of the connecting sheet towards the back direction of the cover plate assembly (3), and bending both the winding core bodies (11) by 90 degrees along the contact position of the winding core bodies and the electrode lugs towards the front direction of the cover plate assembly (3) along the position of the winding core bodies and the electrode lugs; finally, the other ends of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) and the other two winding core assemblies (1) on the other ends repeat the steps; at this time, both the positive electrode tab (12) and the negative electrode tab (13) are in a stretched state;
s4: coating the insulating films (5) on the outer parts of the four winding core bodies (11);
s5: the winding core assembly (1), the connecting sheet assembly (2), the cover plate assembly (3), the insulating adhesive tape (4) and the insulating film (5) are put into the aluminum shell assembly (6) together, and then the matched gaps of the aluminum shells (61, the aluminum shells (62) and the base plate (31) are fixed through laser welding.
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| CN114583409A (en) * | 2022-03-10 | 2022-06-03 | 上海兰钧新能源科技有限公司 | Battery transfer welding method and device |
| CN114709569A (en) * | 2022-03-17 | 2022-07-05 | 合肥国轩高科动力能源有限公司 | Multi-cell lithium battery structure |
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