CN114335662B - Method and structure for welding lithium ion pole piece and battery cell - Google Patents
Method and structure for welding lithium ion pole piece and battery cell Download PDFInfo
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- CN114335662B CN114335662B CN202111543690.1A CN202111543690A CN114335662B CN 114335662 B CN114335662 B CN 114335662B CN 202111543690 A CN202111543690 A CN 202111543690A CN 114335662 B CN114335662 B CN 114335662B
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- 238000003466 welding Methods 0.000 title claims abstract description 95
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 121
- 239000000463 material Substances 0.000 claims abstract description 113
- 239000000758 substrate Substances 0.000 claims abstract description 44
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 239000011888 foil Substances 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 20
- 238000013461 design Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 3
- 210000005069 ears Anatomy 0.000 abstract 1
- 238000004880 explosion Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a method and a structure for welding a lithium ion pole piece and an electric core, comprising the following steps: s1, taking a piece of foil for standby; s2, defining the length difference between the first tab of the innermost ring of the upper winding core and the first tab of the innermost ring of the lower winding core after welding as X; s3, determining the width of a first substrate blank area on two sides of the upper coiled material and the width of a second substrate blank area on two sides of the lower coiled material; s4, dividing an upper coiled material and a lower coiled material on the foil, and coating and cutting; s5, rolling the upper coiled material and the lower coiled material obtained by cutting into an upper coiled core and a lower coiled core respectively, and then welding the upper coiled material and the lower coiled material into the ultra-welding battery cell through ultrasonic waves. Through setting the length of last core first utmost point ear and lower core first utmost point ear to different, rethread eccentric welding realizes that the length of last core first utmost point ear and lower core first utmost point ear is equal on the change piece, and the welding rubberizing can be better covers whole utmost point ears, reduces the welding and explodes the some rate, has improved the convenience and the yields of lithium cell processing.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a method and a structure for welding a lithium ion pole piece and an electric core.
Background
Lithium ion batteries have important roles in our lives, and with the continuous development of new energy industries, enterprises are pursuing better product quality, and meanwhile, improvement of safety and manufacturing rate is also an important point of enterprise consideration.
The pole pieces of the current power battery have the same width in the substrate area (empty foil area) after being cut. The outer side of the ultrasonic welding core is easy to generate excessive redundancy, and the outer side of the battery core is in contact with the shell when the electrode lug is pressed down, so that the electrode lug is reversely inserted to cause short circuit.
The prior Chinese patent with publication number of CN112599933A discloses a multi-coil core parallel assembly method of a lithium battery, which comprises the following steps: step S1: a plurality of single coil cores are welded on the connecting sheet; sequentially combining the plurality of single winding cores, and wrapping a welding area through an insulating tape; each connecting piece comprises tab connecting parts and at least one conductive connecting part, wherein the number of the tab connecting parts is equal to that of the single winding cores, the conductive connecting parts are connected to the tops of the tab connecting parts and extend to one side or two sides of the tab connecting parts, the plurality of single winding cores are arranged side by side, and the tabs of the plurality of single winding cores are welded with the tab connecting parts; step S2: and connecting the core winding group after core combination with the cover plate component.
In order to solve the problem, the Dehai eccentric welding technology is adopted at present to reduce redundancy, reduce short circuit of the battery cell and improve the safety of the battery cell.
The inventor considers that the eccentric welding process in the prior art can lead to the height overlength of the tab of the lower-layer winding core, the ultrasonic rubberizing needs to cover the tab, the rubberizing effect can be affected at the moment, the rubberizing covers the switching sheet, meanwhile, the interference soft connection welding process can occur due to the overlength of the tab, laser is led to be directly beaten on the tab or is led to be beaten on an adhesive tape, explosion points are caused, and the battery core is scrapped. There is a need for improvement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a structure for welding a lithium ion pole piece and an electric core.
The method for welding the lithium ion pole piece and the battery cell provided by the invention comprises the following steps: s1, taking a piece of foil for standby; s2, defining the length difference between the first tab of the innermost ring of the upper winding core and the first tab of the innermost ring of the lower winding core after welding as X, and defining the first tab of the innermost ring of the upper winding core as an upper winding core head tab and the first tab of the innermost ring of the lower winding core as a lower winding core head tab; s3, determining the width W2 of the first base material blank areas on two sides of the upper coiled material and the width W1 of the second base material blank areas on two sides of the lower coiled material according to the length difference X of the upper coiled material head lug and the lower coiled material head lug, and meeting the requirement of X=W2-W1; s4, dividing an upper coiled material and a lower coiled material on the foil according to the width W2 of the first base material blank area, the width W1 of the second base material blank area and the preset width L of the coating area, and coating and cutting; s5, respectively rolling the upper coiled material and the lower coiled material obtained by cutting into an upper coiled material core and a lower coiled material core, making a first substrate blank area on the upper coiled material into an upper coiled material core tab, making a second substrate blank area on the lower coiled material into a lower coiled material core tab, and then performing ultrasonic welding to obtain the ultra-welding battery cell.
Preferably, for step S3: the width W2 of the first substrate blank area is greater than or equal to the width W1 of the second substrate blank area.
Preferably, for step S2, the value of the length difference X between the upper winding core head tab and the lower winding core head tab may also be determined by an ultrasonic eccentric welding design parameter: the ultrasonic eccentric welding design parameters comprise: the height h1 of the bending area of the upper winding core head tab and the height h2 of the bending area of the lower winding core head tab, and x=h1-h 2.
Preferably, the width W2 of the first substrate blank area and the width L of the predetermined paint area both comprise dimension design parameters common in the industry.
Preferably, for step S5, when W2 > W1, the ultrasonic welding of the upper winding core and the lower winding core adopts eccentric welding.
According to the structure for welding the lithium ion pole piece and the battery cell provided by the invention, the method for welding the lithium ion pole piece and the battery cell is adopted by any one of claims 1-5, and the structure comprises an upper layer winding core, a lower layer winding core and a switching piece, wherein an upper winding core head lug of the upper layer winding core and a lower winding core head lug of the corresponding lower layer winding core are welded at the same position of the switching piece, and the upper winding core head lug welded on the switching piece is overlapped with the corresponding lower winding core head lug.
Preferably, the distance between the upper winding core tab and the lower winding core tab is defined as T, and the distance between the upper winding core tab and the lower winding core tab is equal to the distance between the upper winding core tab and the lower winding core tab.
Preferably, the difference between the height h1 of the bending area of the upper winding core head tab and the height h2 of the bending area of the lower winding core head tab is equal to the difference between the width W2 of the first base material blank area and the width W1 of the second base material blank area.
Preferably, the width of the first base material blank area is equal to the width of the second base material blank area, x=w2-w1=0, and the height h1 of the bending area of the upper winding core head tab is equal to the height h2 of the bending area of the lower winding core head tab.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the lengths of the upper winding core head lug and the lower winding core head lug are set to be different, and the lengths of the upper winding core head lug and the lower winding core head lug on the switching piece are equal through eccentric welding, so that the profiles are overlapped, the welding rubberizing can better cover all the lugs, the explosion point caused by soft connection laser due to the overlength of the lugs is reduced, the welding explosion point rate is reduced, and the convenience and the yield of lithium battery processing are improved;
2. according to the invention, the difference value between the first base material blank-keeping area and the second base material blank-keeping area is determined through the difference value between the height of the bending area of the upper winding core head tab and the height of the bending area of the lower winding core head tab, so that the accuracy of eccentric welding is improved, and the efficiency and the success rate of eccentric welding are improved;
3. compared with the prior art, the invention reduces the length of the head lug of the lower winding core by setting the width of the head lug of the upper winding core to be the universal length in conventional processing, and is beneficial to reducing the use amount of foil materials and improving the quality energy density of the battery core.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram showing the slitting structure of an upper coiled material and a lower coiled material with different lengths of blank areas according to the present invention;
FIG. 2 is a schematic side view of an upper core and a lower core eccentrically welded in accordance with the present invention;
FIG. 3 is a schematic view showing the overall structure of an upper or lower core according to the present invention;
FIG. 4 is a top view of an upper and lower core with different length of the blank space;
FIG. 5 is an enlarged view of a portion B of FIG. 4, mainly illustrating a welding structure of the tab and the adapter plate;
FIG. 6 is a schematic diagram showing the slitting structure of an upper coiled material and a lower coiled material with the same length of a blank area according to the present invention;
FIG. 7 is a top view of an upper core and a lower core eccentrically welded with each other, the upper core and the lower core having the same length as the blank area, according to the present invention;
fig. 8 is an enlarged view of a portion a of fig. 7, which mainly shows a welding structure of the tab and the adapter plate.
The figure shows:
lower coiled material 2 lower coiled core head lug 9
Coating zone 3 upper layer winding core 10
Upper coiled material 5 and lower coiled material 11
First base material blank area 6 solder print 13
Second substrate blank 7 transfer tab 14
Winding core head tab 8
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
As shown in fig. 1, 2, 3, 4 and 5, the method for welding a lithium ion pole piece and an electric core according to the present invention includes the following steps:
s1, taking a piece of foil for standby.
S2, defining the length difference between the first tab of the innermost ring of the upper winding core and the first tab of the innermost ring of the lower winding core after welding as X, and defining the first tab of the innermost ring of the upper winding core as an upper winding core head tab 8 and the first tab of the innermost ring of the lower winding core as a lower winding core head tab 9. The value of X can be determined by ultrasonic eccentric welding design parameters. The ultrasonic eccentric welding design parameters include: the height h1 of the bending area of the upper winding core head tab 8, the height h2 of the bending area of the lower winding core head tab 9, and X=h1-h 2, wherein h1 is more than or equal to h2.
S3, determining the width W2 of the first substrate blank areas 6 on two sides of the upper coiled material 5 and the width W1 of the second substrate blank areas 7 on two sides of the lower coiled material 2 according to the length difference X of the upper coiled material core head lug 8 and the lower coiled material core head lug 9, wherein X=W2-W1, and W2 is more than or equal to W1. The present application prefers: w2 is more than W1, X is more than or equal to 0.
S4, dividing the upper coiled material 5 and the lower coiled material 2 on the foil according to the determined width W2 of the first substrate blank area 6, the determined width W1 of the second substrate blank area 7 and the preset width L of the coating area 3, and coating and cutting. The width W2 of the first substrate blank area and the width L of the preset coating area are all common dimension design parameters in industry.
S5, respectively rolling the upper coiled material 5 and the lower coiled material 2 obtained by cutting into an upper coiled material core 10 and a lower coiled material core 11, manufacturing a first substrate blank area 6 on the upper coiled material 5 into an upper coiled material core head lug 8, manufacturing a second substrate blank area 7 on the lower coiled material 2 into a lower coiled material core head lug 9, and then performing ultrasonic welding to form the ultra-welding battery cell.
When W2 is greater than W1, the ultrasonic welding of the upper winding core 10 and the lower winding core 11 adopts eccentric welding.
When w2=w1, the connection of the upper core 10 and the lower core 11 may be made by conventional ultrasonic welding.
When the upper layer winding core 10 and the lower layer winding core 11 are connected, it is required to ensure that after the upper layer winding core 10 and the lower layer winding core 11 are welded into a super-welding battery cell by ultrasonic, an upper winding core head electrode lug 8 and a lower winding core head electrode lug 9 which exceed the position of a welding mark 13 are overlapped, and the length of the lower winding core head electrode lug 9 exceeding the welding mark 13 is T.
Further, when W2 > W1, eccentric welding is adopted, the width W2 of the first substrate blank area 6 is set to be the width required by the general design in the industry. Other dimensions of the upper layer winding core 10 and the lower layer winding core 11 are matched with those required by common design in industry.
The inventor considers that the pole piece produced by the technology can reduce the processing and manufacturing problems of pole lug tearing, pole lug folding, fewer welding explosion points and the like in the processing process of processing the lithium ion battery; compared with the traditional processing technology, the length of the head tab 9 of the lower winding core is reduced, so that the unnecessary use amount of foil is reduced, and the quality energy density of the battery core is also improved.
Through the technology, compared with the traditional eccentric welding, the battery cell scrapping caused by the soft connection explosion point due to the interference of the soft connection welding caused by the overlong length of the head tab 9 of the lower winding core and the overlong rubberizing can be avoided.
Example 2
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, according to the structure for welding a lithium ion pole piece and a battery cell provided by the present invention, the method for welding a lithium ion pole piece and a battery cell described in embodiment 1 is adopted, and the method comprises an upper layer winding core 10, a lower layer winding core 11 and a switching piece 14, wherein an upper winding core head tab 8 of the upper layer winding core 10 and a lower winding core head tab 9 of the corresponding lower layer winding core 11 are welded at the same position of the switching piece 14, and the upper winding core head tab 8 welded on the switching piece 14 coincides with the corresponding lower winding core head tab 9.
Further, the distance that the lower core first tab 9 exceeds the welding mark 13 is T, the distance that the upper core first tab 8 exceeds the welding mark 13 is equal to the distance that the lower core first tab 9 exceeds the welding mark 13, but due to processing errors and assembly errors, a certain reasonable error exists between the distance that the upper core first tab 8 exceeds the welding mark 13 and the distance that the lower core first tab 9 exceeds the welding mark 13, and the overall effect is not influenced.
Specifically, according to the design parameters of eccentric welding and the size of the ultra-welding cell to be processed, the width L of the preset coating area 3 and the width W2 of the first substrate blank area 6 are determined, the width W1 of the second substrate blank area 7 is calculated, the upper coiled material 5 and the lower coiled material 2 are divided on the foil, the preset coating area 3 is coated, then the upper coiled material 5 and the lower coiled material 2 are cut along the cutting positions of the upper coiled material 5 and the lower coiled material 2, and the upper coiled material 5 and the lower coiled material 2 are taken out respectively.
Through the general technology in the existing lithium battery processing, the upper coiled material 5 and the lower coiled material 2 are respectively coiled into an upper coiled material core 10 and a lower coiled material core 11, the first substrate blank area 6 on the upper coiled material 5 is manufactured into an upper coiled material core head tab 8, the second substrate blank area 7 on the lower coiled material 2 is manufactured into a lower coiled material core head tab 9, and then the upper coiled material core 10 and the lower coiled material core 11 are welded.
As shown in fig. 6, 7 and 8, when the width W2 of the first substrate blank space 6 is equal to the width W1 of the second substrate blank space 7, the height of the bending region of the upper core tab 8 is h1, the height of the bending region of the lower core tab 9 is h2, and the upper core tab 8 and the lower core tab 9 are welded on the adapter piece 14 through eccentric welding, and both the upper core tab 8 and the lower core tab 9 exceed the welding mark 13;
if h1 > h2, the edge distance between the upper winding core head tab 8 and the lower winding core head tab 9 on the switching sheet 14 is h 1-h2=x, and at this time, the edge distance between the lower winding core head tab 9 is larger than the edge distance between the upper winding core head tab 8, so that the length of the lower winding core head tab 9 is too long on the premise of meeting the design size of the upper winding core head tab 8, the ultrasonic rubberizing needs to cover the tab, at this time, the rubberizing effect can be affected, the rubberizing covers the switching sheet 14, and meanwhile, the interference soft connection welding procedure can occur due to the too long tab, laser is directly hit on the tab or the laser is hit on the adhesive tape to cause explosion points and electric core rejection.
When the width W2 of the first substrate blank area 6 is equal to the width W1 of the second substrate blank area 7, if h1=h2, at this time, x=h1-h2=0, the distance between the upper core tab 8 and the lower core tab 9 beyond the welding mark 13 is equal to T, at this time, redundancy is easily generated in the outer core tab after the ultrasonic welding core, and when the battery core is pressed down after the battery core is put into the shell, the situation that the outer side is easy to cause short circuit due to the fact that the tab is inserted upside down due to redundancy is easily generated.
As shown in fig. 1 and 2, therefore, in the present application, W2 > W1, and h1 is preferably greater than h2, and the lengths of h1 and h2 in actual processing may be determined according to the actual adjustment effect of the eccentric welding, where W1, W2, and X are determined according to the size of the super-welding cell and the values of h1 and h2. h1-h2=x, preferably w2=w1+x, at this time, the upper core tab 8 and the lower core tab are bent and welded to the transfer sheet 14, and the lengths of the upper core tab 8 and the lower core tab 9 on the transfer sheet 14 are equal, and the shape and the contour are coincident. At the moment, the design requirement of the ultra-welding battery cell is met, the length of the head tab 9 of the lower winding core is not too long, and the situation that the battery cell is scrapped due to soft connection explosion caused by interference of soft connection welding and too long rubberizing is avoided.
Preferred embodiments
Based on the embodiment 2, according to the structure for welding the lithium ion pole piece and the battery cell provided by the invention, the length difference x=3.4 mm between the lower core head tab 9 of the lower layer winding core 11 and the upper core head tab 8 of the upper layer winding core 10 after ultrasonic eccentric welding is provided, the first substrate blank area 6w2=31.5 mm on the upper layer winding material 5, the second substrate blank area 7w1=w2-x=28.1 mm on the lower layer winding material 2, and the width l=375 mm of the preset coating area 3; after coating slitting, an upper web 5 with a width w2=31.5 of the first substrate blank areas 6 on both sides and a lower web 2 with a width w1=28.1 mm of the second substrate blank areas 7 on both sides are obtained.
The upper coiled material 5 is die-cut, formed and cut to be rolled into an upper coiled core 10, and the lower coiled material 2 is die-cut, formed and cut to be rolled into a lower coiled core 11. The length of the upper core head tab 8 of the manufactured upper core 10 is w2=31.5 mm, and the length of the lower core head tab 9 of the manufactured lower core 11 is w1=28.1 mm.
During welding, the height h1 of the bending area of the head tab 8 of the upper winding core is 11.2mm; the height h2=7.8 mm of the bending area of the lower winding core head tab 9. Go up core first utmost point ear 8 and lower core first utmost point ear 9 welded connection respectively in the same position of change piece 14 both sides, and go up core first utmost point ear 8 and lower core first utmost point ear 9 both equal in length on change piece 14, shape contour coincidence, and go up core first utmost point ear 8 and lower core first utmost point ear 9 and surpass the distance of welding seal 13 and be T=2.3mm.
The height alignment of the lower winding core head lug 9 and the upper winding core head lug 8 can be achieved, all lugs can be better covered by welding rubberizing, meanwhile, explosion points caused by soft connection laser caused by ultra-long lugs are reduced, and welding explosion point rate is reduced.
Comparative example
On the basis of embodiment 2, according to the structure for welding the lithium ion pole piece and the battery cell provided by the invention, when the width W2 of the first substrate blank area 6 at two sides of the upper coiled material 5 is equal to the width W1 of the second substrate blank area 7 at two sides of the lower coiled material 2, the width L of the coating area 3 on both the upper coiled material 5 and the lower coiled material 2 is preset to be 375mm.
The upper coiled material 5 is die-cut, formed and cut to be rolled into an upper coiled core 10, and the lower coiled material 2 is die-cut, formed and cut to be rolled into a lower coiled core 11. The length of the upper core head tab 8 of the manufactured upper core 10 is w2=31.5 mm, and the length of the lower core head tab 9 of the manufactured lower core 11 is w1=31.5 mm.
At this time, the upper core head tab 8 and the lower core head tab 9 are welded at the same positions on two sides of the switching piece 14 respectively by adopting eccentric welding, at this time, because h1 is not equal to h2, the lengths of the upper core head tab 8 and the lower core head tab 9 on the switching piece 14 are different, and h1 > h2 can cause the length of the lower core head tab 9 on the switching piece 14 to exceed the length of the lower core head tab 9, the length difference is h1-h2, so that the edge distance between the upper core head tab 8 and the lower core head tab 9 is abnormal, and interference can be generated on the next procedure of lithium battery processing at this time.
Principle of operation
Firstly, taking a piece of foil for standby; defining the length difference between the upper winding core head lug 8 with the largest length and the lower winding core head lug 9 with the largest length as X; then calculating the widths of the first substrate blank areas 6 on two sides of the upper coiled material 5 and the widths of the second substrate blank areas 7 on two sides of the lower coiled material 2; then dividing an upper coiled material 5 and a lower coiled material 2 on the foil by combining the preset width of the coating area 3, coating and cutting, then respectively coiling the upper coiled material 5 and the lower coiled material 2 obtained by cutting into an upper coiled material core 10 and a lower coiled material core 11, manufacturing a first substrate blank area 6 on the upper coiled material 5 as an upper coiled material core head tab 8, manufacturing a second substrate blank area 7 on the lower coiled material 2 as a lower coiled material core head tab 9, and finally performing ultrasonic welding to obtain the ultra-welding battery cell.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (7)
1. The method for welding the lithium ion pole piece and the battery cell is characterized by comprising the following steps:
s1, taking a piece of foil for standby;
s2, defining the length difference between the first tab of the innermost ring of the upper winding core and the first tab of the innermost ring of the lower winding core after welding as X, and defining the first tab of the innermost ring of the upper winding core as an upper winding core head tab (8) and the first tab of the innermost ring of the lower winding core as a lower winding core head tab (9);
s3, determining the width W2 of a first substrate blank area (6) at two sides of the upper coiled material (5) and the width W1 of a second substrate blank area (7) at two sides of the lower coiled material (2) according to the length difference X of the upper coiled material head lug (8) and the lower coiled material head lug (9), wherein X=W2-W1 is satisfied;
s4, dividing an upper coiled material (5) and a lower coiled material (2) on the foil according to the width W2 of the first base material blank area (6), the width W1 of the second base material blank area (7) and the width L of the preset coating area (3), and coating and cutting;
s5, respectively rolling the upper coiled material (5) and the lower coiled material (2) obtained by cutting into an upper coiled material core (10) and a lower coiled material core (11), manufacturing a first substrate blank area (6) on the upper coiled material (5) as an upper coiled material core tab, manufacturing a second substrate blank area (7) on the lower coiled material (2) as a lower coiled material core tab, and then performing ultrasonic welding to form a super-welding cell;
for step S3: the width W2 of the first substrate blank area (6) is larger than or equal to the width W1 of the second substrate blank area (7);
aiming at the step S2, the value of the length difference X of the upper winding core head lug (8) and the lower winding core head lug (9) is determined by ultrasonic eccentric welding design parameters:
the ultrasonic eccentric welding design parameters comprise: the height h1 of the bending area of the upper winding core head tab (8) and the height h2 of the bending area of the lower winding core head tab (9) are equal to each other, and X=h1-h 2;
when W2 is equal to W1, x=w2-w1=h1-h2=0, or
When W2 is greater than W1, x=w2-w1=h1-h2 > 0.
2. The method of welding a lithium-ion pole piece to a battery cell according to claim 1, wherein the width W2 of the first substrate blank area (6) and the width L of the predetermined paint area (3) both comprise industry-wide dimensional design parameters.
3. The method of welding a lithium-ion electrode sheet to a battery cell according to claim 1, wherein for step S5, when W2 > W1, the ultrasonic welding of the upper layer winding core (10) and the lower layer winding core (11) employs eccentric welding.
4. The structure for welding the lithium ion pole piece and the battery cell is characterized in that the method for welding the lithium ion pole piece and the battery cell according to any one of claims 1-3 is adopted and comprises an upper layer winding core (10), a lower layer winding core (11) and a switching piece (14), an upper winding core head lug (8) of the upper layer winding core (10) and a lower winding core head lug (9) of the corresponding lower layer winding core (11) are welded at the same position of the switching piece (14), and the upper winding core head lug (8) welded on the switching piece (14) is overlapped with the corresponding lower winding core head lug (9).
5. The structure for welding a lithium ion pole piece and an electric core according to claim 4, wherein the distance between the lower winding core head lug (9) and the welding mark (13) is defined as T, and the distance between the upper winding core head lug (8) and the welding mark (13) is equal to the distance between the lower winding core head lug (9) and the welding mark (13).
6. The structure for welding a lithium ion pole piece and an electric core according to claim 4, wherein a difference between a bending area height h1 of the upper winding core head pole lug (8) and a bending area height h2 of the lower winding core head pole lug (9) is equal to a difference between a width W2 of the first substrate blank area (6) and a width W1 of the second substrate blank area (7).
7. The structure for welding a lithium ion pole piece and an electric core according to claim 6, wherein the width of the first base material blank area (6) is equal to the width of the second base material blank area (7), x=w2-w1=0, and the height h1 of the bending area of the upper winding core head pole lug (8) is equal to the height h2 of the bending area of the lower winding core head pole lug (9).
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| CN115603005B (en) * | 2022-11-29 | 2023-04-21 | 瑞浦兰钧能源股份有限公司 | Welding method of battery and battery thereof |
| CN114566770B (en) * | 2022-04-29 | 2022-09-16 | 瑞浦兰钧能源股份有限公司 | Welding method of secondary battery tab and battery thereof |
| DE112022000161T5 (en) * | 2022-07-22 | 2024-04-18 | Hangzhou Narada Power Technology Co., Ltd. | Battery cell interconnection assembly and battery |
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