CN114171805B - Lithium ion battery structure and assembly method thereof - Google Patents
Lithium ion battery structure and assembly method thereof Download PDFInfo
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- CN114171805B CN114171805B CN202111468890.5A CN202111468890A CN114171805B CN 114171805 B CN114171805 B CN 114171805B CN 202111468890 A CN202111468890 A CN 202111468890A CN 114171805 B CN114171805 B CN 114171805B
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- winding core
- negative electrode
- assembly
- positive electrode
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 129
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 95
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 95
- 238000005452 bending Methods 0.000 claims abstract description 39
- 239000000306 component Substances 0.000 claims abstract description 39
- 239000008358 core component Substances 0.000 claims abstract description 27
- 239000000758 substrate Substances 0.000 claims description 121
- 238000003466 welding Methods 0.000 claims description 62
- 239000002390 adhesive tape Substances 0.000 claims description 21
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 8
- 230000036961 partial effect Effects 0.000 description 6
- 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
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 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
- 239000007769 metal material Substances 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
- H01M10/058—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a lithium ion battery structure and an assembly method thereof, and relates to the technical field of lithium ion batteries; the winding core assembly comprises an anode lug and a cathode lug, the connecting sheet assembly comprises an anode connecting sheet and a cathode connecting sheet, a boss and a bending stress hole are respectively arranged on the anode lug and the cathode connecting sheet, and a pole is arranged on the cover plate assembly; the connecting sheet component and the cover plate component are fixed through a boss and a pole post, the positive and negative connecting sheets are respectively fixed with the cover plate component and are respectively fixed with the positive and negative lugs at the same time, and the connecting sheet component 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 ion 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 battery and can improve the energy density of the battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery structure and an assembly method thereof.
Background
The traditional lithium ion 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 ion 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 the winding cores of the single lithium ion 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 ion 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 ion 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 ion 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 ion battery.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention discloses a lithium ion battery structure, which comprises a plurality of winding core components, connecting sheet components, cover plate components and aluminum shell components, wherein each winding core component comprises a positive electrode lug and a negative electrode lug, each connecting sheet component comprises a positive electrode connecting sheet and a negative electrode connecting sheet, each positive electrode connecting sheet and each negative electrode connecting sheet are respectively provided with a boss and a bending stress hole, each cover plate component comprises a positive electrode substrate and a negative electrode substrate, each positive electrode substrate and each negative electrode substrate are respectively provided with a pole column, and each 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 hole on the pole, the positive connecting piece is respectively fixed with the positive substrate and the positive lug, the negative connecting piece is respectively fixed with the negative substrate and the negative lug, 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 ion battery, the invention divides the substrate in the cover plate component into the positive electrode substrate and the negative electrode substrate; then fixing the positive electrode connecting sheet, the positive electrode substrate and the positive electrode lug respectively, and fixing the negative electrode connecting sheet, the negative electrode substrate and the negative electrode lug respectively; meanwhile, the large-area laser welding of the connecting sheet assembly and the cover plate assembly is changed 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 assembly, so that metal dust generated in the laser welding process can be effectively prevented from entering the winding core assembly, and the risk of short circuit of the lithium ion 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 ion battery structure, each winding core component is required to be provided with an aluminum shell component and a cover plate component; therefore, the lithium ion 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 ion battery.
Preferably, the winding core assembly further comprises a winding core body and a tab, wherein the tab comprises the positive tab and the 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, and the connecting piece comprises the positive connecting piece and the negative connecting piece; two rows of bending stress holes which are parallel to each other are respectively formed in the positive electrode connecting sheet and the negative electrode connecting sheet, the bosses are respectively fixed on the side faces, facing the outer side of the winding core body, of the positive electrode connecting sheet and the negative electrode connecting sheet, and the positive electrode connecting sheet and the negative electrode connecting sheet are identical in 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 substrate comprises the positive electrode substrate and the negative electrode substrate, and the polar column comprises a positive polar column and a negative polar column; the protection small pieces comprise an anode protection small piece and a cathode protection small piece;
the positive electrode substrate and the negative electrode substrate are respectively provided with a through hole, two insulating sheets are respectively covered on one side of the positive electrode substrate and one side of the negative electrode substrate, which faces the inside of the winding core body, the insulating sheets are of an I-shaped structure with the cross section of the through holes, one end of each insulating sheet covers one side of the substrate, which faces the outside of the winding core body, the other end of each insulating sheet covers one side of the substrate, which faces the inside of the winding core body, a middle penetrating structure is arranged at the middle part, and the penetrating structure and the through holes are coaxially arranged; the positive pole and the negative pole are respectively fixed on the insulating sheet on one side of the positive pole substrate and one side of the negative pole substrate, which face the outer side of the winding core body, and 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 positive electrode substrate and the negative electrode substrate are respectively provided with the liquid injection hole and the explosion-proof valve; meanwhile, the edge 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 both ends of connection piece respectively with the utmost point ear on the reel core subassembly is fixed, anodal ear is placed anodal connection piece with between the anodal protection small, the negative pole ear is placed the negative pole connection piece with between the negative pole protection small.
Preferably, the aluminum shell component comprises one type of aluminum shell, two types of aluminum shells, one type of aluminum shell step grooves and two types of aluminum shell step grooves, wherein the one type of aluminum shell step grooves are formed in the one type of aluminum shell, and the two types of aluminum shells are provided with the two types of aluminum shell step grooves; the first aluminum shell step grooves on the first aluminum shell and the second aluminum shell step grooves on the second aluminum shell are mutually matched and fixed; the first aluminum shell step grooves on the first aluminum shell and the second aluminum shell step grooves on the second aluminum shell are respectively matched and fixed with the substrate step grooves on the positive electrode substrate and the negative electrode substrate.
Preferably, the lithium ion battery structure further comprises an insulating tape; and sticking the insulating adhesive tape to the position where the back surface of the connecting sheet is fixed with the tab, and sticking the insulating adhesive tape to the position where the front surface of the connecting sheet is fixed with the tab and the protection small piece.
Preferably, the lithium ion battery structure further comprises 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 ion 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: welding and fixing the bosses on the positive electrode connecting sheet and the negative electrode connecting sheet with the polar posts on the positive electrode substrate and the negative electrode substrate respectively, so that the connecting sheet assembly is fixedly connected with the cover plate assembly; then the positive electrode connecting sheet and the negative electrode connecting sheet are respectively welded and fixed with the positive electrode lug and the negative electrode lug on the winding core component;
s2: attaching the insulating adhesive tape to the welding place of the back surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape to the welding place of the front 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 front 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 front 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 back 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, the positive electrode substrate and the negative electrode substrate are fixed through laser welding.
The invention also discloses another assembling method adopting a lithium ion 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: welding and fixing the bosses on the positive electrode connecting sheet and the negative electrode connecting sheet with the polar posts on the positive electrode substrate and the negative electrode substrate respectively, so that the connecting sheet assembly is fixedly connected with the cover plate assembly; then the positive electrode connecting sheet and the negative electrode connecting sheet are respectively welded and fixed with the positive electrode lug and the negative electrode lug on the winding core component;
s2: attaching the insulating adhesive tape to the welding place of the back surface of the connecting sheet and the electrode lug, and attaching the insulating adhesive tape to the welding place of the front 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 front 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 front 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 back direction of the cover plate assembly along the bending position of the winding core bodies; 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; the positive electrode lug and the negative electrode lug are in a stretching state at the moment;
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, the positive electrode substrate and the negative electrode substrate are fixed through laser welding.
Therefore, the invention has the advantages that:
1. compared with the structure of the traditional lithium ion battery, the invention divides the substrate in the cover plate component into the positive electrode substrate and the negative electrode substrate; then fixing the positive electrode connecting sheet, the positive electrode substrate and the positive electrode lug respectively, and fixing the negative electrode connecting sheet, the negative electrode substrate and the negative electrode lug respectively; meanwhile, the large-area laser welding of the connecting sheet assembly and the cover plate assembly is changed 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 assembly, so that metal dust generated in the laser welding process can be effectively prevented from entering the winding core assembly, and the risk of short circuit of the lithium ion 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 ion battery structure, each winding core component is required to be provided with an aluminum shell component and a cover plate component; therefore, the lithium ion 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 ion battery.
2. Compared with the traditional lithium ion 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 ion battery structure, the invention can realize the assembly operation of double winding cores and four winding cores of the lithium ion 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 sheet is separated from the substrate and the electrode post by adopting the insulating sheet, so that the connecting sheet, the electrode post and the substrate 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 structure of a winding core assembly and a cover assembly welded together and glued to a negative electrode connection sheet according to an embodiment of the present invention;
fig. 2 is a schematic front perspective view of a connecting piece after bending in the first embodiment of the present invention;
fig. 3 is a schematic view of a rear perspective structure of an insulating film coated according to the first embodiment of the present invention;
FIG. 4 is a schematic view showing a rear perspective structure of a winding core assembly assembled into an aluminum case assembly according to the first embodiment of the present invention;
FIG. 5 is a schematic perspective view of a winding core assembly according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of the negative electrode cover plate assembly and the connecting piece assembly in accordance with the first embodiment of the present invention;
FIG. 7 is a schematic view showing another perspective structure of the negative electrode cover plate assembly and the connecting piece assembly in accordance with the first embodiment of the present invention;
FIG. 8 is a schematic perspective view of the positive cover plate assembly and the connecting piece assembly according to the first embodiment of the present invention;
FIG. 9 is a partial cross-sectional view at A-A of FIG. 8;
fig. 10 is a schematic perspective view of an aluminum shell according to the first embodiment of the present invention;
FIG. 11 is an enlarged partial schematic view at B in FIG. 10;
FIG. 12 is an enlarged partial schematic view at C in FIG. 10;
fig. 13 is a schematic perspective view of a second type aluminum shell according to the first embodiment of the invention;
FIG. 14 is a partially enlarged schematic view of FIG. 13 at D;
FIG. 15 is a partial cross-sectional view of the substrate of FIG. 4 at E mated with an aluminum shell of a type;
FIG. 16 is a partial cross-sectional view taken at F-F in FIG. 2;
fig. 17 is a schematic top view of the connecting piece after bending;
fig. 18 is a schematic perspective view of a connecting piece after bending in the second embodiment of the present invention;
fig. 19 is a partial cross-sectional view at G-G in fig. 18.
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. a boss; 24. bending the stress hole; 3. a cover plate assembly; 301. a positive electrode substrate; 302. a negative electrode substrate; 303. an insulating sheet; 304. a positive electrode post; 305. a negative electrode column; 306. a positive electrode protection tab; 307. a negative electrode protection tab; 308. a liquid injection hole; 309. an explosion-proof valve; 310. 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; 64. class II 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 4, a lithium ion 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. 5, 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. 6 to 9, the connecting piece assembly 2 includes a connecting piece, a boss 23 and a bending stress hole 24, the connecting piece includes a positive connecting piece 21 and a negative connecting piece 22; two rows of bending stress holes 24 which are parallel to each other are respectively formed on the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22, so as to facilitate bending of the connecting sheets; the side faces of the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22 facing the outer side of the winding core body 11 are respectively fixed with a boss 23, and in the embodiment, the structures of the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22 are the same; and all are conductive metal materials, the positive electrode connecting sheet 21 and the boss 23 thereon are made of aluminum, and the negative electrode connecting sheet 22 and the boss 23 thereon are made of copper.
Referring to fig. 1, 6 to 9, the cap plate assembly 3 includes a substrate including a positive electrode substrate 301 and a negative electrode substrate 302, an insulating sheet 303 including a positive electrode column 304 and a negative electrode column 305, a post, a protective tab including a positive electrode protective tab 306 and a negative electrode protective tab 307, a liquid injection hole 308, an explosion-proof valve 309, and a substrate step groove 310; the positive electrode substrate 301 and the negative electrode substrate 302 are respectively provided with a through hole, and two insulating sheets 303 are respectively covered on one side of the positive electrode substrate 301 and the negative electrode substrate 302 facing the inside of the winding core body 11; referring to fig. 9, cross sections of the insulating sheets 303 at through holes on the positive substrate 301 and the negative substrate 302 are in an i-shaped structure, one end of each insulating sheet 303 covers a side surface of the substrate facing the outer side of the winding core body 11, the other end covers a side surface of the substrate facing the inner side of the winding core body 11, the middle part is a penetrating structure, and the penetrating structure of the middle part and the through holes on the substrate are coaxially arranged; positive electrode post 304 and negative electrode post 305 are fixed to insulating sheet 303 on the side of positive electrode substrate 301 and negative electrode substrate 302 facing the outside of winding core body 11, respectively; a pole hole is respectively formed in the positive pole 304 and the negative pole 305, the pole hole is coaxially arranged with the penetrating structure on the insulating sheet 303, the boss 23 on the connecting sheet assembly 2 sequentially penetrates through the penetrating structure in the middle of the insulating sheet 303, the through hole on the substrate and the pole hole on the pole, and the boss 23 and the pole are welded and fixed; the connecting sheet assembly 2 is fixed on the cover plate assembly 3 through the boss 23, and the insulating sheet 303 has the function of separating the connecting sheet from the substrate and separating the substrate from the pole, so that the connecting sheet, the pole and the substrate are prevented from being conducted mutually to cause short circuit; the insulating sheet 303, the substrate and the post are obtained by integral injection molding, and the post hole is also a through hole.
Referring to fig. 6 to 8, the insulating sheet 303 is further provided with a plurality of vent holes for the purpose of reducing the weight of the insulating sheet 303 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 309; the positive substrate 301 and the negative substrate 302 are respectively provided with a liquid injection hole 308 and an explosion-proof valve 309, wherein, the liquid injection hole 308 and the explosion-proof valve 309 can be arranged on the positive substrate 301 or the negative substrate 302, and the specific positions of the liquid injection hole 308 and the explosion-proof valve 309 are not limited by the invention; meanwhile, a substrate step groove 310 is formed at the edge of the positive substrate 301 and the negative substrate 302; in this embodiment, the substrate and the pole are made of conductive metal, and the insulating sheet 303 is made of non-conductive non-metal; the positive electrode column 304 is made of aluminum, and the negative electrode column 305 is made of copper.
Referring to fig. 1, two ends of the connection sheet are respectively fixed with tabs on two winding core assemblies 1, the positive tab 12 is placed between the positive connection sheet 21 and the positive protection tab 306, the negative tab 13 is placed between the negative connection sheet 22 and the negative protection tab 307, and then the tabs, the connection sheet 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 protection small piece is a thin metal piece, and the materials of the positive electrode protection small piece 306 and the negative electrode protection small piece 307 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. 1, an insulating tape 4 is attached to a welding place between the back surface of the connecting piece and the tab, and then an insulating tape 4 is attached to a welding place between the front 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 a short circuit of a battery.
Referring to fig. 3, 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 cover plate assembly 3 and the tab shape 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. 4, 10 to 15, the aluminum shell assembly 6 includes a first aluminum shell 61 and a second aluminum shell 62, wherein the first aluminum shell 61 is provided with a first aluminum shell step groove 63, and the second aluminum shell 62 is provided with a second aluminum shell step groove 64; the first aluminum case step groove 63 on the first aluminum case 61 and the second aluminum case step groove 64 on the second aluminum case 62 are mutually matched and fixed by laser welding, and in addition, the first aluminum case step groove 63 on the first aluminum case 61 and the second aluminum case step groove 64 on the second aluminum case 62 are respectively matched and fixed by laser welding with the substrate step grooves 310 on the positive electrode substrate 301 and the negative electrode substrate 302.
The assembling method of the lithium ion battery structure comprises the following assembling steps:
s1: as shown in fig. 6 to 9, the bosses 23 on the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22 are welded and fixed with the posts on the positive electrode substrate 301 and the negative electrode substrate 302, respectively, so that the connecting sheet assembly 2 is fixedly connected with the cover plate assembly 3; as shown in fig. 1, the positive electrode connecting piece 21 and the negative electrode connecting piece 22 are welded and fixed with the positive electrode tab 12 and the negative electrode tab 13 on the winding core assembly 1 respectively.
S2: as shown in fig. 1, an insulating tape 4 is attached to a welding place of the back surface of the connecting sheet and the tab, and then the insulating tape 4 is attached to a welding place of the front surface of the connecting sheet and the tab and the protection small piece;
s3: as shown in fig. 2, 16 and 17, both ends of the positive electrode connecting sheet 21 and the negative electrode connecting sheet 22 are bent by 90 degrees along two rows of bending stress holes 24 toward the front direction of the cover plate assembly 3, and at this time, the winding core assembly 1 is also bent by 90 degrees toward the front direction of the cover plate assembly 3 along with bending of the connecting sheets; then, the position of the tab is unchanged, and the winding core body 11 is bent for 90 degrees towards the back surface 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. 3, the insulating film 5 is coated on the outside of the two winding core bodies 11;
s5: as shown in fig. 1 to 17, 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 where the first aluminum case 61, the second aluminum case 62, the positive electrode substrate 301 and the negative electrode substrate 302 are matched is fixed by laser welding.
Embodiment two:
referring to fig. 18 and 19, the same as the first embodiment is different in that the number of the winding core assemblies 1 is four in this embodiment, the two positive electrode tabs 12 and the two negative electrode tabs 13 of the two winding core assemblies 1 are correspondingly clung 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 19, the method for assembling a lithium ion 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. 18 and 19, 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 24 towards the front direction 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 front direction 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 back direction 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 (8)
1. The utility model provides a lithium ion battery structure, includes a plurality of book core subassembly (1), connection piece subassembly (2), apron subassembly (3) and aluminum hull subassembly (6), and book core subassembly (1) are including anodal ear (12) and negative pole ear (13), and connection piece subassembly (2) are including anodal connection piece (21) and negative pole connection piece (22), its characterized in that: the positive electrode connecting piece (21) and the negative electrode connecting piece (22) are respectively provided with a boss (23) and a bending stress hole (24), the cover plate assembly (3) comprises a positive electrode substrate (301), a negative electrode substrate (302) and a protection small piece, the positive electrode substrate (301) and the negative electrode substrate (302) are respectively provided with a pole, and the pole is provided with a pole hole; the protection tabs comprise a positive electrode protection tab (306) and a negative electrode protection tab (307), the positive electrode tab (12) is placed between the positive electrode connection tab (21) and the positive electrode protection tab (306), and the negative electrode tab (13) is placed between the negative electrode connection tab (22) and the negative electrode protection tab (307);
the connecting piece assembly (2) and the cover plate assembly (3) are fixed through the boss (23) and the pole hole on the pole, the positive connecting piece (21) is respectively fixed with the positive substrate (301) and the positive lug (12), the negative connecting piece (22) is respectively fixed with the negative substrate (302) and the negative lug (13), and the connecting piece assembly (2) is bent through the bending stress hole (24); the plurality of winding core components (1) and the connecting sheet components (2) are arranged in the aluminum shell component (6) together, and the aluminum shell component (6) is fixed with the cover plate component (3);
the winding core assembly (1) further comprises a winding core body (11) and a tab, wherein the tab comprises the positive tab (12) and the negative tab (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, wherein the connecting piece comprises the positive connecting piece (21) and the negative connecting piece (22); two rows of bending stress holes (24) which are parallel to each other are respectively formed in the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22), the bosses (23) are respectively fixed on the side surfaces, which face the outer side of the winding core body (11), of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22), and the structures of the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) are the same; both ends of the positive electrode connecting sheet (21) are respectively fixed with the positive electrode lug (12), and both ends of the negative electrode connecting sheet (22) are respectively fixed with the negative electrode lug (13);
the aluminum shell assembly (6) comprises a first aluminum shell (61) and a second aluminum shell (62), wherein a first aluminum shell step groove (63) on the first aluminum shell (61) and a second aluminum shell step groove (64) on the second aluminum shell (62) are respectively matched with substrate step grooves (310) on the positive electrode substrate (301) and the negative electrode substrate (302) and are fixed through laser welding.
2. A lithium ion battery structure according to claim 1, wherein: the cover plate assembly (3) further comprises a substrate, an insulating sheet (303), a liquid injection hole (308), an explosion-proof valve (309) and a substrate step groove (310), wherein the substrate comprises the positive electrode substrate (301) and the negative electrode substrate (302), and the polar column comprises a positive polar column (304) and a negative polar column (305);
the positive electrode substrate (301) and the negative electrode substrate (302) are respectively provided with a through hole, two insulating sheets (303) are respectively covered on one side of the positive electrode substrate (301) and one side of the negative electrode substrate (302) facing the inside of the winding core body (11), the insulating sheets (303) are of I-shaped structures with the cross sections of the positions of the through holes, one end of each insulating sheet (303) covers one side of the substrate facing the outside of the winding core body (11), the other end covers one side of the substrate facing the inside of the winding core body (11), and the middle part of each insulating sheet penetrates through structures which are coaxially arranged with the through holes; the positive pole (304) and the negative pole (305) are respectively fixed on the insulating sheet (303) on one surface of the positive pole substrate (301) and the negative pole substrate (302) facing the outer side of the winding core body (11), and a pole hole is respectively formed in the positive pole (304) and the negative pole (305), and the pole hole and the penetrating structure are coaxially arranged;
a plurality of vent holes are further formed in the insulating sheet (303), and the liquid injection holes (308) and the explosion-proof valves (309) are respectively formed in the positive electrode substrate (301) and the negative electrode substrate (302); meanwhile, the edge of the substrate is also provided with the substrate step groove (310); the boss (23) on the connecting sheet assembly (2) sequentially penetrates through the penetrating structure in the middle of the insulating sheet (303), the through hole on the substrate and the pole hole on the pole, and the boss (23) and the pole are fixed;
and two ends of the connecting sheet are respectively fixed with the lugs on the winding core assembly (1).
3. A lithium ion battery structure according to claim 2, characterized in that: the aluminum shell assembly (6) comprises a class-I aluminum shell step groove (63) and a class-II aluminum shell step groove (64), the class-I aluminum shell (61) is provided with the class-I aluminum shell step groove (63), and the class-II aluminum shell (62) is provided with the class-II aluminum shell step groove (64); the class-one aluminum shell step groove (63) on the class-one aluminum shell (61) and the class-two aluminum shell step groove (64) on the class-two aluminum shell (62) are mutually matched and fixed.
4. A lithium ion battery structure according to claim 2, characterized in that: the lithium ion battery structure further comprises an insulating adhesive tape (4); and sticking the insulating adhesive tape (4) to the position where the back surface of the connecting sheet is fixed with the lug, and sticking the insulating adhesive tape (4) to the position where the front surface of the connecting sheet is fixed with the lug and the protection small piece.
5. A lithium ion battery structure according to claim 1, wherein: the lithium ion battery structure further comprises an insulating film (5); the insulating film (5) is coated on the winding core assembly (1).
6. A lithium ion battery structure according to claim 1, wherein: the number of the winding core components (1) is two or four.
7. A method of assembling a lithium ion battery structure according to any one of claims 1-6, 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: welding and fixing the lug bosses (23) on the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) with the polar posts on the positive electrode substrate (301) and the negative electrode substrate (302) respectively, so that the connecting sheet assembly (2) is fixedly connected with the cover plate assembly (3); the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) are respectively welded and fixed with the positive electrode lug (12) and the negative electrode lug (13) on the winding core assembly (1);
s2: an insulating adhesive tape (4) is stuck to the welding position of the back surface of the connecting sheet and the electrode lug, and then the insulating adhesive tape (4) is stuck to the welding position of the front 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) along two rows of bending stress holes (24) for 90 degrees towards the front direction of the cover plate assembly (3), wherein the winding core assembly (1) is bent for 90 degrees towards the front direction of the cover plate assembly (3) along with bending of the connecting sheets; then, the position of the tab is unchanged, and the winding core body (11) is bent for 90 degrees towards the back surface 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), the positive electrode substrate (301) and the negative electrode substrate (302) are fixed through laser welding.
8. A method of assembling a lithium ion battery structure according to any one of claims 1-6, 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: welding and fixing the lug bosses (23) on the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) with the polar posts on the positive electrode substrate (301) and the negative electrode substrate (302) respectively, so that the connecting sheet assembly (2) is fixedly connected with the cover plate assembly (3); the positive electrode connecting sheet (21) and the negative electrode connecting sheet (22) are respectively welded and fixed with the positive electrode lug (12) and the negative electrode lug (13) on the winding core assembly (1);
s2: an insulating adhesive tape (4) is stuck to the welding position of the back surface of the connecting sheet and the electrode lug, and then the insulating adhesive tape (4) is stuck to the welding position of the front 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 (24) towards the front 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 front 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 back 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; the positive electrode lug (12) and the negative electrode lug (13) are in a stretching state at the moment;
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), the positive electrode substrate (301) and the negative electrode substrate (302) are fixed through laser welding.
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| CN114865238B (en) * | 2022-04-22 | 2023-08-22 | 合肥国轩高科动力能源有限公司 | Lithium battery |
| CN217589335U (en) * | 2022-05-12 | 2022-10-14 | 湖北亿纬动力有限公司 | Connecting piece and battery |
| CN115377619B (en) * | 2022-08-09 | 2024-04-16 | 合肥国轩高科动力能源有限公司 | Battery with two side tabs and assembling method |
| CN117458071B (en) * | 2023-11-07 | 2024-04-30 | 湖南沃尔顿新能源科技有限公司 | High-density lithium ion battery structure convenient to detach |
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