CN114335662A - 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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- CN114335662A CN114335662A CN202111543690.1A CN202111543690A CN114335662A CN 114335662 A CN114335662 A CN 114335662A CN 202111543690 A CN202111543690 A CN 202111543690A CN 114335662 A CN114335662 A CN 114335662A
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- 238000003466 welding Methods 0.000 title claims abstract description 91
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 93
- 239000000463 material Substances 0.000 claims abstract description 66
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 239000011888 foil Substances 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 34
- 238000005452 bending Methods 0.000 claims description 20
- 238000013461 design Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000002087 whitening effect Effects 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 238000003754 machining Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 10
- 238000004880 explosion Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 230000009286 beneficial 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
- 230000006872 improvement Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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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
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Abstract
The invention provides a method and a structure for welding a lithium ion pole piece and a battery cell, which 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; s3, determining the width of a first base material blank area on two sides of the upper coiled material and the width of a second base material blank area on two sides of the lower coiled material; s4, dividing the upper layer coil and the lower layer coil on the foil, and coating and cutting; and S5, respectively rolling the upper-layer coiled material and the lower-layer coiled material obtained by splitting into an upper-layer coiled core and a lower-layer coiled core, and then performing ultrasonic welding to obtain the super-welding battery core. Through will go up roll up the length of core head utmost point ear and roll up core head utmost point ear down and set up to the difference, rethread eccentric welding, it is equal with the two length on the switching piece of core head utmost point ear down to roll up core head utmost point ear in the realization, and the welding rubberizing can be better cover whole utmost point ear, reduces the welding and explodes some rate, has improved lithium battery machining's convenience and yields.
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 a battery cell.
Background
Lithium ion batteries have a great importance in our lives, and with the continuous development of new energy industries, enterprises seek better product quality and simultaneously the improvement of safety and manufacturing goodness is also the key point of enterprise consideration.
The pole pieces of the current power batteries have the same width in the base material area (the empty foil area) after being cut. The core pole ear is rolled up to the outside behind ultrasonic bonding core appears redundant quantity easily too much, appears the outside because the redundant quantity leads to the utmost point ear to insert backward when the utmost point ear pushes down after the shell is gone into to electric core and arouses the short circuit.
The prior Chinese patent with publication number CN112599933A discloses a multi-winding core parallel assembly method of a lithium battery, which comprises the following steps: step S1: a plurality of single winding cores are welded on the connecting sheet; then, sequentially combining the single winding cores, and wrapping the welding area by an insulating tape; each connecting piece comprises tab connecting parts and at least one conductive connecting part, 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 single winding cores are arranged side by side, and tabs of the single winding cores are welded with the tab connecting parts; step S2: and connecting the combined winding core group with the cover plate component.
In order to solve the problem, the traditional German sea eccentric welding process is adopted to reduce the redundancy, reduce the short circuit of the battery cell and improve the safety of the battery cell.
The inventor thinks that eccentric welding process among the prior art can lead to the high overlength of the utmost point ear of lower floor's book core, and the ultrasonic wave rubberizing needs cover utmost point ear, can influence rubberizing effect, rubberizing cover switching piece this moment, also can appear interfering the flexible coupling welding process simultaneously because utmost point ear overlength, lead to the laser directly to beat on the utmost point ear or beat the sticky tape on lead to exploding the point, cause scrapping of electric core. There are areas to be improved.
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 a battery cell.
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 the head tab of the upper winding core and the first tab of the innermost ring of the lower winding core as the head tab of the lower winding core; s3, determining the width W2 of a first base material blank area at two sides of an upper coiled material and the width W1 of a second base material blank area at two sides of a lower coiled material according to the length difference X of the upper coiled core head tab and the lower coiled core head tab, wherein X is W2-W1; s4, dividing an upper layer coil and a lower layer coil 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 width L of a preset coating area, and coating and cutting; and S5, respectively rolling the upper-layer coiled material and the lower-layer coiled material obtained by cutting into an upper-layer coiled core and a lower-layer coiled core, manufacturing a first base material blank area on the upper-layer coiled material into an upper-layer coiled core lug, manufacturing a second base material blank area on the lower-layer coiled material into a lower-layer coiled core lug, and then ultrasonically welding to form the super-welding battery cell.
Preferably, for step S3: the width W2 of the first substrate margin is greater than or equal to the width W1 of the second substrate margin.
Preferably, for step S2, the value of the length difference X between the upper core head tab and the lower core head tab may also be determined by ultrasonic eccentric welding design parameters: the ultrasonic off-center weld design parameters include: the bending region height h1 of the upper winding core head tab and the bending region height h2 of the lower winding core head tab are equal to h1-h 2.
Preferably, the width W2 of the first substrate margin area and the width L of the pre-set coating area both comprise sizing parameters common in the industry.
Preferably, for step S5, when W2 > W1, the ultrasonic welding of the upper and lower winding cores is 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 comprises an upper-layer winding core, a lower-layer winding core and a switching sheet, wherein an upper-layer winding core head lug of the upper-layer winding core and a corresponding lower-layer winding core head lug of the lower-layer winding core are welded at the same position of the switching sheet, and the upper-layer winding core head lug welded on the switching sheet is superposed with the corresponding lower-layer winding core head lug.
Preferably, the distance that the lower roll core head tab exceeds the welding mark is defined as T, and the distance that the upper roll core head tab exceeds the welding mark is equal to the distance that the lower roll core head tab exceeds the welding mark.
Preferably, the difference between the height h1 of the bending region of the upper core head tab and the height h2 of the bending region of the lower core head tab is equal to the difference between the width W2 of the first substrate blank region and the width W1 of the second substrate blank region.
Preferably, the width of the first base material blank area is equal to the width of the second base material blank area, X is W2-W1 is 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 roll core head lug and the lower roll core head lug are set to be different, and then eccentric welding is carried out, so that the lengths of the upper roll core head lug and the lower roll core head lug on the adapter plate are equal, the outlines of the upper roll core head lug and the lower roll core head lug are overlapped, the welding rubberizing can better cover all the lugs, explosion points caused by flexible connection laser due to overlong lugs can be reduced, the welding explosion point rate is reduced, and the convenience and the yield of lithium battery processing can be improved;
2. according to the method, the difference value between the first base material blank area and the second base material blank area is determined according to the difference value between the height of the bending area of the upper roll core head lug and the height of the bending area of the lower roll core head lug, so that the accuracy of eccentric welding is improved, and the efficiency and the success rate of the eccentric welding are improved;
3. according to the invention, the width of the upper roll core head lug is set to be the universal length in conventional processing, compared with the prior art, the length of the lower roll core head lug is reduced under the condition of meeting design requirements, the use amount of foil materials is reduced, and the quality energy density of a battery core is improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a slitting structure of an upper layer coiled material and a lower layer coiled material which mainly embody the present invention and have different lengths of a blank area;
FIG. 2 is a schematic side view of the present invention showing the eccentric welding of the upper core and the lower core;
FIG. 3 is a schematic view of the overall structure of the upper layer winding core or the lower layer winding core according to the present invention;
FIG. 4 is a top view of the present invention showing the eccentric welding of the upper core and the lower core in different lengths of the white space;
fig. 5 is an enlarged view of a portion B of fig. 4, which mainly shows a schematic view of a welding structure of a tab and an adaptor plate;
FIG. 6 is a schematic view of the slitting structure of the upper layer coil and the lower layer coil with the same length of the blank areas according to the main embodiment of the present invention;
FIG. 7 is a top view of an eccentric weld of an upper core and a lower core embodying the present invention with the same length of the white space;
fig. 8 is an enlarged view of a portion a of fig. 7, which mainly shows a schematic view of a welding structure of the tab and the interposer.
Shown in the figure:
lower roll core head tab 9 of lower layer coiled material 2
Coating zone 3 upper layer winding core 10
Upper layer coiled material 5 and lower layer coiled core 11
First substrate blank area 6 solder print 13
The second substrate blank region 7 is provided with an adapter plate 14
Upper roll core head pole ear 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 invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
As shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, the method for welding the lithium ion pole piece and the battery cell according to the present invention includes the following steps:
and 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 may be determined by ultrasonic off-center weld design parameters. The design parameters of ultrasonic eccentric welding comprise: the height h1 of the bending region of the upper winding core head tab 8 and the height h2 of the bending region of the lower winding core head tab 9 are equal to h1-h2, and h1 is not less than h 2.
And S3, determining the width W2 of the first base material blank areas 6 on two sides of the upper layer coil 5 and the width W1 of the second base material blank areas 7 on two sides of the lower layer coil 2 according to the length difference X of the upper core head tab 8 and the lower core head tab 9, wherein X is W2-W1, and W2 is not less than W1. The application preferably comprises the following steps: w2 is more than W1, and X is more than or equal to 0.
S4, dividing the upper web 5 and the lower web 2 on the foil according to the determined width W2 of the first substrate margin 6, the width W1 of the second substrate margin 7 and the preset width L of the painting zone 3, and coating and slitting. Wherein the width W2 of the first substrate whitespace zone and the width L of the pre-set coating zone are both sizing parameters common in the industry.
And S5, respectively rolling the upper-layer coiled material 5 and the lower-layer coiled material 2 obtained by splitting into an upper-layer roll core 10 and a lower-layer roll core 11, manufacturing a first substrate whitening area 6 on the upper-layer coiled material 5 into an upper roll core first tab 8, manufacturing a second substrate whitening area 7 on the lower-layer coiled material 2 into a lower roll core first tab 9, and then ultrasonically welding to obtain the super-welding battery core.
When W2 is more than W1, the ultrasonic welding of the upper layer winding core 10 and the lower layer winding core 11 adopts eccentric welding.
When W2 is equal to W1, the connection of the upper core 10 and the lower core 11 can be made by conventional ultrasonic welding.
When the upper layer winding core 10 and the lower layer winding core 11 are connected, after the upper layer winding core 10 and the lower layer winding core 11 are welded into a super-welding electric core through ultrasonic waves, the upper winding core head lug 8 exceeding the position of the welding mark 13 and the lower winding core head lug 9 coincide, and the length of the lower winding core head lug 9 exceeding the welding mark 13 is T.
Further, when W2 > W1, the width W2 of the first substrate margin 6 is set to the width required by the design commonly used in the industry by eccentric welding. Other sizes of the upper layer winding core 10 and the lower layer winding core 11 are matched with the size of the universal design requirement in the industry.
The inventor believes that the pole piece produced by the technology can reduce the processing and manufacturing problems of tearing of a pole lug, folding of the pole lug, 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 first tab 9 of the lower winding core is reduced, so that the use amount of unnecessary foil is reduced, and the quality energy density of the battery cell is also improved.
Through the technology, compared with the traditional eccentric welding, the electric core scrapping caused by the flexible connection explosion point caused by the interference of the overlong length of the head tab 9 of the lower winding core on the flexible connection welding 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 according to embodiment 1 includes an upper layer winding core 10, a lower layer winding core 11, and an adapter sheet 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 adapter sheet 14, and the upper winding core head tab 8 welded on the adapter sheet 14 coincides with the corresponding lower winding core head tab 9.
Further, the distance that lower roll core first utmost point ear 9 surpasses and welds seal 13 is T, and the distance that upper roll core first utmost point ear 8 surpasses and welds seal 13 equals with the distance that lower roll core first utmost point ear 9 surpasses and welds seal 13, but because processing error and assembly error, the distance that leads to upper roll core first utmost point ear 8 to surpass and weld seal 13 and lower roll core first utmost point ear 9 surpasss and weld seal 13 has certain reasonable error, and it does not influence whole effect.
Specifically, according to the design parameters of eccentric welding and the size of the super welding battery core needing to be processed, the width L of a preset coating area 3 and the width W2 of a first substrate blank area 6 are determined, the width W1 of a second substrate blank area 7 is calculated, an upper-layer coiled material 5 and a lower-layer coiled material 2 are divided on a foil, then the preset coating area 3 is coated, then cutting is carried out along the cutting positions of the upper-layer coiled material 5 and the lower-layer coiled material 2, and the upper-layer coiled material 5 and the lower-layer coiled material 2 are respectively taken out.
Through the general technique among the current lithium cell processing, roll up upper roll core 10 and lower floor's book core 11 with upper coiled material 5 and lower floor's coiled material 2 respectively to leave white 6 preparation of district as the first utmost point ear 8 of upper roll core with the first substrate on the upper coiled material 5, leave white 7 preparation of district as the first utmost point ear 9 of lower roll core with the second substrate on the lower floor's coiled material 2, later roll up core 10 and lower floor's book core 11 to the upper roll and carry out welding operation again.
As shown in fig. 6, 7 and 8, when the width W2 of the first substrate whitening area 6 and the width W1 of the second substrate whitening area 7 are equal, the height of the bending area of the upper core head tab 8 is h1, the height of the bending area of the lower core head tab 9 is h2, the upper core head tab 8 and the lower core head tab 9 are welded on the adapter sheet 14 by eccentric welding, and both the upper core head tab 8 and the lower core head tab 9 exceed the weld seal 13;
if h1 > h2, the edge distance that the last roll core head utmost point ear 8 that lies in on the switching piece 14 rolls up core head utmost point ear 9 with down is h1-h2 ═ X, the edge distance that the core head utmost point ear 9 was rolled up down this moment is than the big X of the edge distance that rolls up core head utmost point ear 8, thereby lead to rolling up under the prerequisite of core head utmost point ear 8 design size on satisfying, roll up core head utmost point ear 9's length overlength down, ultrasonic wave rubberizing needs to cover utmost point ear, can influence the rubberizing effect this moment, rubberizing covers switching piece 14, also can appear interfering the flexible coupling welding process because utmost point ear overlength simultaneously, lead to the laser directly to beat on the utmost point ear or beat and lead to the explosion point on the sticky tape, cause scrapping of electric core.
When the width W2 of the first base material blank area 6 is equal to the width W1 of the second base material blank area 7, if h1 is h2, X is h1-h2 is 0 at this time, the distance that the upper winding core head tab 8 exceeds the welding mark 13 is equal to the distance that the lower winding core head tab 9 exceeds the welding mark 13, at this time, the redundancy easily occurs to the outer winding core tab after the core is welded and joined by ultrasonic welding, and the situation that the outer side causes the tab to be inserted upside down to cause a short circuit easily occurs when the tab is pressed down after the core is inserted into the case because the redundancy is large.
As shown in fig. 1 and fig. 2, therefore, in the present application, W2 > W1 is preferred, h1 is greater than h2, the lengths of h1 and h2 in actual processing can be determined according to the actual adjustment effect of the eccentric welding, and W1, W2 and X are determined according to the size of the super welding cell and the specific values of h1 and h 2. h1-h2 is X, preferably W2 is W1+ X, and at this time, the upper core head tab 8 and the lower core tab are bent and welded to the interposer 14, and the upper core head tab 8 and the lower core head tab 9 have the same length on the interposer 14 and have the same shape and contour. Both satisfied the design requirement of surpassing and welded electric core this moment, still satisfied down roll up the length of core first utmost point ear 9 and can not the overlength, avoided the flexible coupling welded interference and rubberizing overlength to cause the flexible coupling explodes the condition emergence of electric core condemned that the point leads to.
Preferred embodiment(s) of the invention
On the basis of embodiment 2, according to the structure for welding a lithium ion pole piece and a battery cell provided by the invention, after ultrasonic eccentric welding, the length difference X between the lower winding core head tab 9 of the lower winding core 11 and the upper winding core head tab 8 of the upper winding core 10 is 3.4mm, the first base material blank region 6W2 on the upper winding web 5 is 31.5mm, the second base material blank region 7W1 on the lower winding web 2 is W2-X is 28.1mm, and the width L of the preset coating region 3 is 375 mm; after coating and slitting, an upper web 5 with a width W2 of 31.5 in the first substrate margins 6 on both sides and a lower web 2 with a width W1 of 28.1mm in the second substrate margins 7 on both sides were obtained.
The upper layer coil 5 is respectively die-cut, formed, cut and rolled into an upper layer coil core 10, and the lower layer coil 2 is die-cut, formed, cut and rolled into a lower layer coil core 11. The length of the upper core head tab 8 of the manufactured upper core 10 is 31.5mm in W2, and the length of the lower core head tab 9 of the manufactured lower core 11 is 28.1mm in W1.
During welding, the height h1 of the bending area of the upper winding core head tab 8 is 11.2 mm; the height h2 of the bending area of the lower winding core head tab 9 is 7.8 mm. Go up to roll up first utmost point ear 8 of core and roll up first utmost point ear 9 down and weld the same position in switching piece 14 both sides respectively, and go up to roll up first utmost point ear 8 of core and roll up the length of first utmost point ear 9 two on switching piece 14 down and equal, the shape profile coincidence, and the distance that first utmost point ear 8 of core and roll up first utmost point ear 9 of core down surpasss to weld seal 13 is T2.3 mm.
Roll up core first utmost point ear 9 and go up the high alignment of core first utmost point ear 8 down this moment, the spot of explosion that flexible coupling laser that the welding rubberizing can be better that covers whole utmost point ear, utmost point ear overlength caused simultaneously causes reduces the welding and explodes the spot rate.
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 regions 6 on both sides of the upper layer coil 5 is equal to the width W1 of the second substrate blank regions 7 on both sides of the lower layer coil 2, the width L of the coating region 3 on both the upper layer coil 5 and the lower layer coil 2 is preset to 375 mm.
The upper layer coil 5 is respectively die-cut, formed, cut and rolled into an upper layer coil core 10, and the lower layer coil 2 is die-cut, formed, cut and rolled into a lower layer coil core 11. The length of the upper core head tab 8 of the manufactured upper core 10 is 31.5mm in terms of W2, and the length of the lower core head tab 9 of the manufactured lower core 11 is 31.5mm in terms of W1.
Adopt eccentric welding to weld the same position in switching piece 14 both sides respectively with the two of the first utmost point ear 8 of last book core and the first utmost point ear 9 of lower book core this moment, this moment because h1 does not equal h2, the two length that is located switching piece 14 of the first utmost point ear 8 of last book core and the first utmost point ear 9 of lower book core is different, and h1 > h2 can cause the length of the first utmost point ear 9 of lower book core on the switching piece 14 to surpass the length of the first utmost point ear 9 of lower book core, its length difference is h1-h2, thereby lead to the edge distance of the first utmost point ear 8 of last book core and the first utmost point ear 9 of lower book core unusual, can produce the interference to the next process of lithium cell processing this moment.
Principle of operation
Firstly, taking a piece of foil for standby; then the length difference between the upper roll core head tab 8 with the maximum length and the lower roll core head tab 9 with the maximum length is defined as X; then, the width of a first base material blank area 6 at two sides of the upper coiled material 5 and the width of a second base material blank area 7 at two sides of the lower coiled material 2 are calculated; then, an upper-layer coiled material 5 and a lower-layer coiled material 2 are divided on the foil by combining the width of a preset coating area 3, coating and splitting are carried out, then the upper-layer coiled material 5 and the lower-layer coiled material 2 obtained by splitting are respectively rolled into an upper-layer roll core 10 and a lower-layer roll core 11, a first substrate blank leaving area 6 on the upper-layer coiled material 5 is made into an upper-layer roll core head lug 8, a second substrate blank leaving area 7 on the lower-layer coiled material 2 is made into a lower-layer roll core head lug 9, and finally, the super-welding battery core is formed through ultrasonic welding.
In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A method for welding a lithium ion pole piece and a 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 base material blank area (6) at two sides of an upper layer coil (5) and the width W1 of a second base material blank area (7) at two sides of a lower layer coil (2) according to the length difference X of the upper core head tab (8) and the lower core head tab (9), and meeting the requirement that X is W2-W1;
s4, dividing the upper layer coil (5) and the lower layer coil (2) on the foil according to the width W2 of the first substrate blank area (6), the width W1 of the second substrate blank area (7) and the width L of the preset coating area (3), and coating and cutting;
s5, respectively rolling the upper-layer coiled material (5) and the lower-layer coiled material (2) obtained by cutting into an upper-layer coiled core (10) and a lower-layer coiled core (11), manufacturing a first substrate whitening area (6) on the upper-layer coiled material (5) into an upper coiled core lug, manufacturing a second substrate whitening area (7) on the lower-layer coiled material (2) into a lower coiled core lug, and then ultrasonically welding to obtain the super-welding battery core.
2. The method for welding the lithium ion pole piece and the battery cell of claim 1, wherein for step S3: the width W2 of the first substrate margin (6) is greater than or equal to the width W1 of the second substrate margin (7).
3. The method for welding the lithium ion pole piece and the battery cell according to claim 1, wherein for step S2, the value of the length difference X between the upper core head tab (8) and the lower core head tab (9) can be further determined by ultrasonic eccentric welding design parameters:
the ultrasonic off-center weld design parameters include: the bending region height h1 of the upper winding core head tab (8) and the bending region height h2 of the lower winding core head tab (9) are equal to h1-h 2.
4. The method for welding the lithium ion pole piece and the battery cell as recited in claim 1, wherein the width W2 of the first substrate margin area (6) and the width L of the preset coating area (3) both comprise size design parameters common in the industry.
5. The method for welding the lithium ion pole piece and the battery cell as claimed in claim 1, wherein for the step S5, when W2 > W1, the ultrasonic welding of the upper winding core (10) and the lower winding core (11) adopts eccentric welding.
6. The structure for welding the lithium ion pole piece and the battery cell is characterized in that the structure for welding the lithium ion pole piece and the battery cell comprises an upper-layer winding core (10), a lower-layer winding core (11) and a switching sheet (14), wherein the upper-layer winding core first pole lug (8) of the upper-layer winding core (10) and the lower-layer winding core first pole lug (9) of the corresponding lower-layer winding core (11) are welded at the same position of the switching sheet (14), and the upper-layer winding core first pole lug (8) on the switching sheet (14) is welded to be overlapped with the corresponding lower-layer winding core first pole lug (9).
7. The structure for welding the lithium ion pole piece and the battery cell as recited in claim 6, wherein the distance that the lower core head tab (9) exceeds the welding mark (13) is defined as T, and the distance that the upper core head tab (8) exceeds the welding mark (13) is equal to the distance that the lower core head tab (9) exceeds the welding mark (13).
8. The structure for welding the lithium ion pole piece and the battery cell as recited in claim 6, wherein the difference between the height h1 of the bending region of the upper winding core head tab (8) and the height h2 of the bending region of the lower winding core head tab (9) is equal to the difference between the width W2 of the first substrate blank region (6) and the width W1 of the second substrate blank region (7).
9. The structure for welding the lithium ion pole piece and the battery cell as claimed in claim 8, wherein the width of the first base material blank region (6) is equal to the width of the second base material blank region (7), X is W2-W1 is 0, and the height h1 of the bending region of the upper winding core head tab (8) is equal to the height h2 of the bending region of the lower winding core head tab (9).
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| CN114335662B (en) | 2024-04-09 |
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