CN115752253A - Method and system for detecting and adjusting effects of current collector after combined welding - Google Patents
Method and system for detecting and adjusting effects of current collector after combined welding Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting and adjusting the effect of a current collector after combined welding, wherein the method comprises the steps of detecting the distance from the edge of a coating film in a hollow foil area of a composite current collector to the edge of the current collector by increasing a CCD (charge coupled device) camera, and detecting the width of a front-back welding area, the distance from the edge of the welding area to the edges of upper and lower layers of metal foils and the edge of the coating film and the appearance of the welding area by increasing the CCD camera after welding; calculating the distance between the front and back side printing areas and the edge of the coating area and the edge dislocation quantity of the upper and lower layers of metal foils according to the detected data; and feeding back the numerical value obtained by calculation to the metal foil unwinding deviation correcting system and the composite current collector unwinding deviation correcting system for real-time adjustment. The risk that one side of a welding seal is not welded to a film coating area and the other side of the welding seal falls into the film coating area due to different widths of two coated films during coating of the current collector and the risk that the upper metal foil and the lower metal foil cover the film coating area can be avoided. The metal foil unreeling deviation correcting system and the composite current collector unreeling deviation correcting system are adjusted in real time, and the alignment degree and the welding quality of the upper metal foil and the lower metal foil are guaranteed.
Description
Technical Field
The invention relates to the technical field of battery tab welding, in particular to a method and a system for detecting and adjusting the effect of a current collector after combined welding.
Background
In the current power battery, a negative current collector mostly adopts copper foil, and a positive current collector mostly adopts aluminum foil. However, after the battery manufactured by the traditional current collector is damaged due to dendritic crystal growth, external force and other reasons to cause thermal runaway, the safety risk of battery explosion exists. Therefore, the composite current collector technology is produced. Compare traditional single mass flow body, the base film material in the middle of the compound mass flow body just like the fuse, when meetting this kind of failure mode of short circuit, fracture that can be quick or melt to do not further conduction current, finally prevented the burning of electric core, guaranteed the safety of battery. However, the tab of the composite current collector cannot output the current in the battery cell to the electrode terminal, and thus, the tab of the traditional current collector and the tab of the composite current collector need to be used for switching, so as to transmit the current in the battery cell.
The conventional lug connection of the current collector and the composite current collector mostly adopts an ultrasonic continuous welding process. The utility model discloses a utility model patent application with publication number CN208539000U discloses a welding set and processing equipment of secondary cell mass flow body, and this application uses welding set will import to the foil of welding station and weld in the part of compound mass flow body for the utmost point ear use of compound mass flow body can be regarded as to the foil, through the switching of foil, makes the electric current in the electric core can be carried out. The processing equipment comprises a foil and composite current collector coiling and uncoiling device, a welding device, a tension adjusting device, a deviation correcting device and the like. The utility model discloses a utility model patent application for publication No. CN215005034U discloses a weld and seal detection device, including transfer assembly, CCD determine module and cutting element, transfer assembly is used for conveying the product material area, and CCD determine module and cutting element establish along the transfer orbit direction in product material area in proper order, and CCD determine module is used for detecting the welding seal of the single item in the product material area, and cutting element is used for getting rid of the product material and takes and detect unqualified single item.
However, the existing online detection and adjustment method for the effect of the traditional current collector and composite current collector after combined welding does not have a perfect solution, such as the problems of the alignment degree of welding marks after welding, the existence of a cold joint phenomenon and the like. Particularly, after the composite current collector is coated on both sides, if the widths of the coating films on both sides are not consistent, the risk that one side of the welding mark is not welded to the coating film area, but the other side of the welding mark is welded to the coating film area during welding is easily caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem of the effect after traditional mass flow body and the combination welding of compound mass flow body can't real-time detection and adjustment at present is solved.
In order to solve the technical problems, the invention provides the following technical scheme:
a current collector combination welding structure is a layered structure, the middle is a composite current collector, the upper layer is an upper metal foil, and the lower layer is a lower metal foil; the method comprises the following steps:
s1, collecting the distances D1 positive and negative between the front and back coating edges of a composite current collector coating pole piece foil reserving area and the edges of the composite current collector and the widths W1 positive and W1 negative of the coating area before welding;
s2, after welding, collecting distances D2 from the welding edges of the front and back welding areas to the edges of the upper and lower layers of metal foils, namely, the distances D2 are directly outside, the distances D2 are reversely outside, the distances D2 are directly inside and the distances D2 are reversely inside; the welding printing widths W2 of the front side and the back side are positive and negative; the widths W3 of the coating areas on the front surface and the back surface are positive and negative; collecting distances D3 within the welding edge of the front and back welding area and the edge of the coating area and D3 within the back; collecting the appearance of a welding area;
s3, calculating distances D4 within the front and back welding area edges and the coating area edge, and D4 within the back;
s4, calculating the dislocation quantity of the upper metal foil and the lower metal foil;
and S5, adjusting the alignment of the upper and lower metal foils and the distance between the welding area and the edge of the film coating area according to the distance between the front and back welding areas and the edge of the film coating area, the dislocation amount of the upper and lower metal foils and the welding appearance.
The advantages are that: the invention adjusts the alignment degree of the upper and lower metal foils and the distance between the welding area and the edge of the coating area in real time through calculation, thereby ensuring the alignment degree of the upper and lower metal foils and the welding quality. The risk that one side of a welding seal is not welded to a film coating area and the other side of the welding seal falls into the film coating area due to different widths of two coated films during coating of the current collector and the risk that the upper metal foil and the lower metal foil cover the film coating area can be avoided.
Preferably, in the current collector combined welding structure, the composite current collector is subjected to double-sided coating, a hollow foil area is reserved, and the width of the upper and lower pure metal foils is greater than that of the hollow foil area of the composite current collector; when the combined welding is carried out, one side close to the welding head is an upper layer, and one side far away from the welding head is a lower layer.
Preferably, the acquisition step in step S1 is:
s11, adding CCD linear array cameras on the front side and the back side after the composite current collector is unreeled and before welding;
s12, calculating the distances D1 positive and D1 negative of the edges of the front and back side coating films from the edges of the composite current collector empty foil area according to the shot edges of the front and back side composite current collector empty foil area and the positions of the edges close to the coating films of the empty foil area;
s13, calculating the widths W1 of the front and back coating areas and the width W1 of the front and back coating areas according to the shot edge of the non-tab side and the shot edge position close to the coating film of the empty foil area;
when the welding head is combined and welded, one side close to the welding head is a front side, and the other side far away from the welding head is a back side.
Preferably, the collecting step in step S2 is:
s21, adding a CCD linear array camera in a front and back welding area after the composite current collector is combined and welded and before the composite current collector is rolled;
s22, calculating the widths W2 of the front and back welding and printing areas and the widths W2 of the front and back welding and printing areas, the distances D2 between the outer edges of the welding and printing areas and the outer edges of the metal foils are positive outside, D2 is negative outside, the distances D2 between the inner edges of the welding and printing areas and the inner edges of the metal foils are positive inside and negative inside by a CCD camera according to the positions of the two edges of the welding and printing areas and the positions of the edges of the upper and lower layers of metal foils;
s23, calculating the widths W3 of the front and back coating areas and the widths W3 of the front and back coating areas after welding according to the shot edge of the non-tab of the composite current collector and the shot edge position close to the coating of the welding area;
s24, calculating distances D3 within the welding edge of the front and back welding areas from the edge of the coating area and D3 within the back of the welding area after welding according to the shot edge position close to the coating film of the welding area and the shot inner edge position of the welding area;
wherein, when the combination welding is carried out, one side close to the coating area is the inner side, and the side far away from the coating area is the outer side.
Preferably, in step S2, distances D4 from the edge of the front-back side welding area to the edge of the coating area are within a positive range and D4 from a negative range, and after the combination welding and before the winding, the appearance condition of the welding area is recognized by a CCD line camera, and the appearance defect is recognized: and the upper and lower metal foils are folded and damaged after welding leakage and welding.
Preferably, the calculation formulas of the distances D4 directly inside and D4 reversely inside from the front and back side welding area edge to the coating area edge in step S3 are as follows:
d4 positive inner = D3 positive inner- (W1 positive-W3 positive);
d4 trans-endo = D3 trans-endo- (W1 trans-W3 trans);
the adopted data are all data collected in the same section or at the same position before and after welding.
Preferably, the method for calculating the dislocation amount of the upper and lower metal foils in step S4 comprises:
s41, calculating the difference between the positive W2 and the negative W2;
s42, if the absolute value of the difference value between the positive W2 and the negative W2 is less than or equal to 0.2, and the area where the positive W2 and the negative W2 are located has no folds of the upper metal foil and the lower metal foil and is not damaged well; calculating the difference between the outside of D2 and the difference between the inside of D2 and the inside of D2, and taking the larger difference as the dislocation quantity of the upper metal foil and the lower metal foil;
s43, if the absolute value of the positive and negative difference values of W2 is larger than 0.2 or the area where the positive and negative difference values of W2 are located has wrinkles and bad breakage of the upper and lower metal foils, the dislocation amount of the area or the position is not included in the calculation.
Preferably, the specific steps of the adjustment in step S5 are:
s51, if the absolute value of the difference value between the positive W2 and the negative W2 calculated in the step S4 is less than or equal to 0.2, and the area where the positive W2 and the negative W2 are located has no folds of the upper metal foil and the lower metal foil and is not damaged well;
calculating the difference value between the minimum value between the D4 positive inner and the D4 negative inner and the distance design standard median value between the welding area inner edge and the coating area edge, wherein if the difference value is within the range of the set tolerance requirement, the unreeling deviation correction of the composite current collector is not required to be adjusted;
if the difference value exceeds the tolerance requirement range, the unreeling deviation correction of the composite current collector is adjusted according to the difference value;
meanwhile, calculating the difference value of the distance between the D2 positive inner edge, the D2 negative inner edge and the inner edge of the welding area and the distance between the upper and lower metal foil inner edges to a design standard median value, and adjusting the metal foil unreeling deviation correcting system according to the difference value;
s52, if the absolute value of the difference value between the W2 and the W2 is larger than 0.2 or the area where the upper and lower metal foils are wrinkled and damaged badly exists, carrying out feedback adjustment on the unwinding deviation correction of the area or the position according to the numerical value before the abnormity does not exist.
The invention also discloses a current collector combination welding effect detection and adjustment system, which is used for detecting and adjusting the effect of the current collector combination welding effect, wherein the current collector combination welding structure is a laminated structure, the middle part is a composite current collector, the upper layer is an upper metal foil, and the lower layer is a lower metal foil; the method comprises the following steps:
the pre-welding acquisition unit is used for acquiring distances D1 positive and reverse between the front and back side coating edges of the composite current collector coating pole piece foil reserving area and the edge of the composite current collector and the widths W1 positive and W1 reverse of the coating area before welding;
the post-welding acquisition unit is used for acquiring distances D2 from the welding edges of the front and back welding areas to the edges of the upper and lower layers of metal foils, namely, the distances D2 are right outside, the distances D2 are reverse outside, the distances D2 are right inside and the distances D2 are reverse inside after welding; the welding printing widths W2 of the front side and the back side are positive and negative; the widths W3 of the front and back surface coating areas are positive and negative; collecting distances D3 within the welding edge of the front and back welding area and the edge of the coating area and D3 within the back; collecting the appearance of a welding area;
the calculating unit is used for calculating distances D4 within the front and back welding area edges and the coating area edges and D4 within the back; calculating the dislocation quantity of the upper metal foil and the lower metal foil;
and the judging and adjusting unit is used for adjusting the alignment of the upper metal foil and the lower metal foil and the distance between the printing area and the edge of the coating area according to the distance between the front and back printing areas and the edge of the coating area, the dislocation quantity of the upper metal foil and the lower metal foil and the welding appearance.
Preferably, when the combined unit performs combined welding on the current collector, the composite current collector is subjected to double-sided coating and a hollow foil area is reserved, and the width of the upper and lower pure metal foils is greater than that of the hollow foil area of the composite current collector; when the combined welding is carried out, one side close to the welding head is an upper layer, and one side far away from the welding head is a lower layer.
Compared with the prior art, the invention has the beneficial effects that: the invention increases the distance between the CCD camera to detect the edge of the coating film in the composite current collector empty foil area and the edge of the current collector, and increases the width of the welding area of the front side and the back side, the distance between the welding edge and the edges of the upper layer and the lower layer of metal foil and the coating film, and the appearance of the welding area after welding; calculating the distance from the front side and the back side of the welding print to the edge of the film coating area and the edge dislocation amount of the upper layer metal foil and the lower layer metal foil according to the detected data; and feeding back the numerical value obtained by calculation to the metal foil unwinding deviation correcting system and the composite current collector unwinding deviation correcting system for real-time adjustment. The risk that one side of a welding seal is not welded to a film coating area and the other side of the welding seal falls into the film coating area due to different widths of two coated films during coating of the current collector and the risk that the upper metal foil and the lower metal foil cover the film coating area can be avoided. The metal foil unreeling deviation correcting system and the composite current collector unreeling deviation correcting system are adjusted in real time, and the alignment degree and the welding quality of the upper metal foil and the lower metal foil are guaranteed.
Drawings
Fig. 1 is a schematic top view of a current collector assembly welding structure and various inspection dimensions according to a first embodiment of the present invention;
fig. 2 is a schematic front view of a current collector assembly welding structure and various inspection dimensions according to a first embodiment of the present invention;
in the figure: 1. coating a metal foil; 2. a lower metal foil; 3. compounding a current collector; 31. coating a film area; 4. and (7) welding and printing areas.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
Referring to fig. 1 and 2, the embodiment discloses a method for detecting and adjusting the effect of a current collector after combined welding, which is used for combined welding of current collectors, and has a layered structure, a composite current collector 3 in the middle, and pure metal foils on the upper and lower layers. In the current collector combined welding structure, the composite current collector 3 is coated on both sides and a hollow foil area is reserved, and the width of the pure metal foil material on the upper layer and the lower layer is larger than that of the hollow foil area of the composite current collector 3; wherein, the definition of the upper layer and the lower layer is as follows: when the welding head is combined and welded, one side close to the welding head is an upper layer, and one side far away from the welding head is a lower layer. The method comprises the following steps:
s1, collecting the distances D1 from the front and back coating edges of the coated pole piece foil reserving area of the composite current collector 3 to the edges of the composite current collector 3, namely the positive and negative distances D1, and the widths W1 of the coating area 31, namely the positive and negative distances W1, before welding. The specific collection steps are as follows:
and S11, adding CCD linear array cameras on the front side and the back side after the composite current collector 3 is unreeled and before welding.
And S12, calculating the distances D1 positive and negative and D1 negative of the edges of the front and back coating films from the edges of the empty foil area of the composite current collector 3 according to the photographed edges of the empty foil area of the front and back composite current collector 3 and the positions of the edges close to the coating films of the empty foil area.
And S13, calculating the widths W1 of the front and back coating areas 31 to be front and back according to the shot edge positions of the non-tab side edge and the edge position close to the empty foil area.
Wherein, the location of positive and negative face is: when the combined welding is carried out, one side close to the welding head is a front side, and one side far away from the welding head is a back side.
S2, after welding, collecting distances D2 from the welding edges of the front and back welding areas 4 to the edges of the upper and lower layers of metal foils, namely D2 outside, D2 inside and D2 inside; the welding printing widths W2 of the front side and the back side are positive and negative; the widths W3 of the front and back surface coating areas 31 are positive and negative; collecting distances D3 within the welding edge of the front and back welding area 4 and the edge of the coating area 31 and D3 within the back; and collecting the appearance of the welding area. The specific acquisition steps are as follows:
and S21, adding a CCD linear array camera in the front and back welding area 4 after the composite current collector 3 is combined and welded and before the composite current collector is rolled.
S22, the CCD camera calculates the width W2 of the welding and printing area 4 on the front side and the back side, the distance D2 between the outer edge of the welding and printing area 4 and the outer edge of the metal foil is right outside, the distance D2 between the inner edge of the welding and printing area 4 and the distance D2 between the inner edge of the metal foil is right inside and the distance D2 between the inner edge of the welding and printing area 4 and the inner edge of the metal foil is reverse inside according to the positions of the two edges of the welding and printing area 4 and the edge positions of the upper and lower layers of the metal foil.
And S23, calculating the widths W3 of the front and back surface coating areas 31 after welding according to the shot non-tab side edge of the composite current collector 3 and the shot edge position close to the welding area coating.
And S24, calculating distances D3 within the front and back welding areas 4 from the welding edge to the coating area 31 and D3 within the back after welding according to the shot edge position close to the welding area coating and the shot inner edge position of the welding area 4.
Wherein, the location of the inside and outside is: when the welding is combined, the side close to the film coating area 31 is the inner side, and the side far away from the film coating area 31 is the outer side.
S3, calculating distances D4 within the front and back welding area 4 from the edge of the coating area 31 and D4 within the back:
the distance D4 from the front side solder-printed edge to the edge of the coating film region 31 is directly within = D3 directly within- (W1 directly-W3 directly).
The distance D4 between the reverse side printed edge and the edge of the coating film area 31 is reversed-inside = D3 reversed-inside- (W1 reversed-W3 reversed).
The adopted data are all data collected in the same section or at the same position before and after welding.
S4, calculating the dislocation quantity of the upper metal foil and the lower metal foil; the method for calculating the dislocation amount comprises the following steps:
and S41, calculating the difference between the positive and negative W2.
S42, if the absolute value of the difference value between the positive W2 and the negative W2 is less than or equal to 0.2, and the area where the positive W2 and the negative W2 are located has no folds of the upper metal foil and the lower metal foil and is not damaged well; calculating the difference between the D2 positive outside and the D2 negative outside and the difference between the D2 positive inside and the D2 negative inside, and taking the larger difference as the dislocation quantity of the upper metal foil and the lower metal foil.
S43, if the absolute value of the difference value between the positive value and the negative value of the W2 is larger than 0.2 or the upper metal foil and the lower metal foil are wrinkled and damaged badly in the area, the dislocation amount of the area or the position is not included in the calculation.
And S5, feeding back to the metal foil unwinding deviation correcting system and the composite current collector 3 unwinding deviation correcting system according to the distance between the front and back welding area 4 and the edge of the coating area 31, the dislocation amount of the upper and lower metal foils and the welding appearance, and adjusting the alignment degree of the upper and lower metal foils and the distance between the welding area 4 and the edge of the coating area 31. The specific method comprises the following steps:
s51, if the absolute value of the difference between the positive W2 and the negative W2 is smaller than 0.2, and the area has no folds and bad damages of the upper and lower metal foils, calculating the difference between the minimum value between the positive D4 inner and the negative D4 inner and the design standard median of the distance between the welding area 4 inner edge and the coating area 31 edge, if the difference is within the tolerance requirement range, the unwinding deviation correction of the composite current collector 3 is not required to be adjusted, and if the difference exceeds the tolerance requirement range, the unwinding deviation correction of the composite current collector 3 is adjusted according to the difference. And meanwhile, calculating the difference value of the distance between the D2 positive inner edge, the D2 negative inner edge and the inner edge of the welding area 4 and the distance between the upper and lower metal foil inner edges to the design standard median, and adjusting the metal foil unreeling deviation correcting system according to the difference value.
S52, if the absolute value of the difference value between the W2 and the W2 is larger than 0.2 or the area where the difference value exists has wrinkles and bad damages of the upper and lower metal foils, the unwinding deviation correction of the area or the position is subjected to feedback adjustment according to the value before the abnormality does not exist.
The detection and adjustment method increases the distance between the edge of the coating film in the empty foil area of the composite current collector 3 detected by the CCD camera and the edge of the current collector, and increases the width of the welding area 4 on the front side and the back side, the distance between the welding edge and the edge of the upper layer metal foil and the lower layer metal foil, the distance between the welding edge and the edge of the coating film and the appearance of the welding area after welding; calculating the distance from the front side and the back side of the welding print to the edge of the film coating area 31 and the edge dislocation amount of the upper and lower layers of metal foils according to the detected data; and feeding back the numerical value obtained by calculation to the metal foil unwinding deviation correcting system and the composite current collector 3 unwinding deviation correcting system for real-time adjustment. The risk that the welding mark on one side is not welded to the coating film area 31 and the welding mark on the other side falls into the coating film area 31 due to different coating film widths on the two sides during coating of the current collector and the risk that the upper metal foil and the lower metal foil cover the coating film area 31 can be avoided. The metal foil unreeling deviation correcting system and the composite current collector 3 unreeling deviation correcting system are adjusted in real time, and the alignment degree and the welding quality of the upper metal foil and the lower metal foil are guaranteed.
According to the method for detecting and adjusting the current collector combined welding effect, the current collector combined welding effect is detected on line and adjusted in real time. The following examples are presented to illustrate the details:
the welding effect design requirements are as follows:
1. the distance between the welding inner edge and the inner edges of the upper metal foil and the lower metal foil is 0.65 +/-0.2 mm.
2. The dislocation amount of the upper and lower metal foils is +/-0.2 mm.
3. The distance between the solder printing inner edge and the coating film edge is 0.8 +/-0.2 mm, and the coating film edge closest to the solder printing inner edge is calculated.
4. The width of the solder print is 3mm.
Meanwhile, the design median of the film width of the front and back sides of the composite current collector 3 is 450mm, and the design median of the width of the empty foil area is 5mm. In the current specification, aluminum foils with the width of 10mm are used as upper and lower metal foils, and the upper and lower metal foils and the composite current collector 3 which is coated on the front and back sides and meets the requirements are combined and welded in an ultrasonic continuous roll welding mode.
Before welding, corresponding values of the width W1 of the coating area 31 collected by a CCD camera in a positive direction and a negative direction of the width W1 of the coating area are respectively 450.341mm and 450.724mm in a set area;
after welding, using a CCD camera to perform real-time online detection, and detecting the following parameter values in the current area:
1. the distances D2 from the welding edge of the front welding area 4 to the edges of the upper and lower layers of metal foils are respectively 6.192mm and 0.784mm just outside and inside D2.
2. The distances D2 between the welding edge of the reverse welding area 4 and the edges of the upper and lower layers of metal foils are respectively 6.021mm and 0.959mm.
3. The front and back welding width W2 is 3.023mm and 3.020mm for the front and back sides respectively and the W2 is opposite.
4. The widths W3 of the front and back surface coating regions 31 are 450.341mm and 450.286mm, respectively.
5. The distances D3 from the welding edge of the front and back welding area 4 to the edge of the coating area 31 are respectively 0.996mm and 0.959mm.
And the welding and printing have no welding leakage, and the upper and lower metal foils have no folds and damage.
Therefore, the following data can be calculated:
1. the distance D4 from the front side solder print edge to the edge of the coating film area 31 is just inside:
d4 positive inner = D3 positive inner- (W1 positive-W3 positive) =0.996mm- (450.341 mm-450.341 mm) =0.996mm.
The distance D4 between the edge of the reverse side welding print and the edge of the coating area 31 is within the range:
d4 positive inner = D3 trans inner- (W1 trans-W3 trans) =0.959mm- (450.724 mm-450.286 mm) =0.521mm.
2. Calculating the dislocation quantity of the upper metal foil and the lower metal foil:
the absolute value of W2 plus-W2 minus is less than or equal to 0.2; then calculate
D2 out-D2 out | = |6.192mm-6.021mm | =0.171mm.
D2 direct-direct | = |0.784mm-0.959mm | =0.175mm.
Further, the dislocation amount of the upper and lower metal foils is 0.175mm.
3. And (3) adjusting and calculating the edge distance between the welding and printing distance and the coating area 31:
from the above measurement calculations and requirements, it is known that:
the distance D4 between the edge of the front welding print and the edge of the coating area 31 is 0.996mm; the distance D4 between the edge of the reverse side solder print and the edge of the coating film area 31 is 0.521mm.
The distance between the welding mark inner edge and the coating film edge is 0.8 +/-0.2 mm in the design median.
Then (+ representing outward adjustment, -representing inward adjustment) can be calculated:
the designed median difference between the distance D4 from the edge of the front welding print to the edge of the coating area 31 and the distance from the welding print inner edge to the edge of the coating is +0.196mm;
the designed median difference of the distance D4 from the reverse side welding print edge to the edge of the coating area 31 and the distance from the welding print inner edge to the coating edge is-0.279 mm;
and taking the larger value of the difference as-0.279 mm, namely, adjusting the unwinding deviation of the composite current collector 3 inwards by 0.279mm.
4. And (3) adjusting and calculating the alignment of the upper metal foil and the lower metal foil:
from the above measurement calculations and requirements, it is known that:
d2 plus inner =0.784mm; d2 trans-inner =0.959mm.
The distance between the welding inner edge and the inner edges of the upper metal foil and the lower metal foil is required to be 0.65 +/-0.2 mm.
Then (+ representing outward adjustment, -representing inward adjustment) can be calculated:
distances D2 between the welding inner edge of the front and back welding area 4 and the inner edge of the upper and lower metal foil layers are respectively +0.134mm and +0.309mm from the D2 positive inner edge and the D2 negative inner edge to the design requirement median difference.
According to the calculated data, the unreeling deviation correcting system needs to be adjusted as follows:
1. the unwinding deviation rectification of the composite current collector 3 is adjusted to be 0.279mm inwards.
2. The unreeling deviation of the upper metal foil 1 is adjusted by 0.134mm outwards.
3. The unwinding deviation of the lower metal foil 2 is adjusted by 0.309mm outwards.
When the next area immediately after the area detects that the corresponding values of the welding width W2 positive and the welding width W2 negative are respectively 3.323mm and 3.020mm or detects that the lower metal foil 2 is seriously wrinkled close to the welding area, the unreeling deviation correcting system of the area is still adjusted according to the adjustment amount of the area.
Example two
This embodiment has still disclosed a mass flow body combination welding back effect detects and adjustment system for with mass flow body combination welding, the structure is laminated structure, and the centre is compound mass flow body 3, and upper and lower layer is pure metal foil, includes:
and the pre-welding acquisition unit is used for acquiring distances D1 positive and reverse between the coating edges of the front and back surfaces of the coating area of the coated pole piece of the composite current collector 3 and the edges of the composite current collector 3 and the widths W1 positive and reverse between the coating areas 31 before welding.
The post-welding acquisition unit is used for acquiring distances D2 from the welding edges of the front and back welding areas 4 to the edges of the upper and lower layers of metal foils, namely, the distances D2 are right outside, the distances D2 are reverse outside, the distances D2 are right inside and the distances D2 are reverse inside after welding; the welding width W2 of the front side and the back side is positive, and W2 is negative; the widths W3 of the front and back surface coating areas 31 are positive and negative; collecting distances D3 within the welding edge of the front and back welding area 4 and the edge of the coating area 31 and D3 within the back; and collecting the appearance of the welding area.
The calculating unit is used for calculating the distances D4 within the front and back welding edges from the edge of the coating area 31 and the distances D4 within the back; and calculating the dislocation amount of the upper metal foil and the lower metal foil.
And the judging and adjusting unit is used for adjusting the alignment degree of the upper metal foil and the lower metal foil and the edge distance of the welding and printing distance coating area 31 according to the distance between the welding and printing on the front side and the back side and the edge of the coating area 31, the dislocation amount of the upper metal foil and the lower metal foil and the welding appearance.
When the combined unit carries out current collector combined welding, the composite current collector 3 is coated on both sides and a hollow foil area is reserved, and the width of the pure metal foil on the upper layer and the lower layer is larger than that of the hollow foil area of the composite current collector 3; when the combined welding is carried out, one side close to the welding head is an upper layer, and one side far away from the welding head is a lower layer.
The collection unit includes before the welding:
the shooting unit before welding is used for adding CCD linear array cameras on the front side and the back side after the composite current collector 3 is unreeled and before welding;
the calculating unit before welding is used for calculating the distances D1 positive and D1 negative of the edges of the front and back side coating films from the edges of the empty foil area of the composite current collector 3 according to the shot edges of the empty foil area of the front and back side composite current collector 3 and the positions of the edges close to the coating films of the empty foil area; and calculating the widths W1 of the front and back surface coating areas 31 according to the shot edge positions of the non-tab side edge and the edge position close to the empty foil area coating.
When the welding head is combined and welded, one side close to the welding head is a front side, and the other side far away from the welding head is a back side.
The post-welding acquisition unit includes:
and a shooting unit after welding, wherein a CCD linear array camera is added in the front and back welding area 4 after the composite current collector 3 is combined and welded and before rolling.
And a calculation unit after welding, wherein a CCD camera calculates the welding width W2 of the front side and the back side, the distance D2 between the outer edge of the welding seal and the outer edge of the metal foil, the distance D2 between the inner edge of the welding seal and the inner edge of the metal foil, and the distance D2 between the inner edge of the welding seal and the inner edge of the metal foil.
And calculating the widths W3 of the front and back surface coating areas 31 after welding according to the shot non-tab side edge of the composite current collector 3 and the edge position close to the coating film of the welding area.
And calculating distances D3 within the front and back welding seal areas 4 from the edge of the coating area 31 and D3 within the back according to the shot edge position close to the coating film in the welding area and the position of the welding seal inner edge.
During the combination welding, the side close to the film coating area 31 is the inner side, and the side far from the film coating area 31 is the outer side.
The calculation unit includes:
the D4 positive internal and D4 negative internal calculation units have internal calculation formulas as follows:
d4 plus inner = D3 plus inner- (W1 plus-W3 plus);
d4 trans-endo = D3 trans-endo- (W1 trans-W3 trans);
the adopted data are all data collected in the same section or at the same position before and after welding.
Misalignment amount calculation means:
for calculating the difference between W2 positive and W2 negative; if the absolute value of the difference value between the positive W2 and the negative W2 is less than or equal to 0.2, and the area is not provided with folds of the upper metal foil and the lower metal foil and is not damaged well; calculating the difference between the outside of the D2 and the difference between the inside of the D2 and the inside of the D2, and taking the larger difference as the dislocation quantity of the upper metal foil and the lower metal foil; if the absolute value of the difference between the positive value and the negative value of W2 is greater than 0.2 or the upper metal foil and the lower metal foil are wrinkled and damaged badly in the area, the dislocation amount of the area or the position is not included in the calculation.
The judgment adjustment unit includes:
a judging unit: is used for judging whether the absolute value of the difference value between the positive value and the negative value of the W2 and the W2 is 0.2 and whether the upper metal foil and the lower metal foil are not wrinkled or not and are not damaged.
The first adjusting unit is used for calculating that the absolute value of the difference value between the positive W2 and the negative W2 is less than or equal to 0.2, and the area where the positive W2 and the negative W2 are located has no folds of the upper metal foil and the lower metal foil and is bad in breakage; calculating the difference value between the minimum value between the D4 positive inner and the D4 negative inner and the distance design standard median value between the welding seal inner edge and the edge of the coating area 31, wherein if the difference value is within the range of the set tolerance requirement, the unreeling deviation correction of the composite current collector 3 does not need to be adjusted; if the difference value exceeds the tolerance requirement range, the unreeling deviation correction of the composite current collector 3 is adjusted according to the difference value; and simultaneously, calculating the difference value of the distance between the D2 positive inner edge, the D2 negative inner edge and the welding inner edge from the upper and lower metal foil inner edges to the design standard median value, and adjusting the metal foil unreeling deviation correcting system according to the difference value.
And if the absolute value of the difference value between the positive W2 and the negative W2 is greater than 0.2 or the area where the metal foil is folded and damaged badly exists, the unwinding deviation correction of the area or the position is subjected to feedback adjustment according to the numerical value before the abnormity does not exist.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above-mentioned embodiments only represent embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the concept of the present invention, and these embodiments are all within the protection scope of the present invention.
Claims (10)
1. A current collector combination welding structure is a layered structure, the middle part is a composite current collector (3), the upper layer is an upper metal foil (1), and the lower layer is a lower metal foil (2); the method is characterized in that: the method comprises the following steps:
s1, collecting distances D1 positive and D1 negative of the edge of a coating area (31) on the front and back sides of a pole piece foil reserving area coated with a composite current collector (3) from the edge of the composite current collector (3) and widths W1 positive and W1 negative of the coating area (31) before the current collector is combined and welded;
s2, after welding, collecting distances D2 from the welding edges of the front and back welding areas (4) to the edges of the upper and lower layers of metal foils, namely D2 outside, D2 inside and D2 inside; the welding printing widths W2 of the front side and the back side are positive and negative; the widths W3 of the front and back surface coating areas (31) are positive and negative; collecting distances D3 within the welding edge of the front and back welding area (4) and the edge of the coating area (31) and D3 within the front and back; collecting the appearance of a welding area;
s3, calculating distances D4 within a positive mode and D4 within a negative mode from the edge of the front-back welding area (4) to the edge of the coating area (31);
s4, calculating the dislocation quantity of the upper and lower metal foils;
and S5, adjusting the alignment degree of the upper metal foil (1) and the lower metal foil (2) and the distance between the welding area (4) and the edge of the coating area (31) according to the distance between the front and back welding areas (4) and the edge of the coating area (31), the dislocation amount of the upper and lower metal foils and the welding appearance.
2. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 1, wherein: in the current collector combined welding structure, the composite current collector (3) is coated on both sides and a hollow foil area is reserved, and the width of the upper layer pure metal foil and the lower layer pure metal foil is larger than that of the hollow foil area of the composite current collector (3); when the combined welding is carried out, one side close to the welding head is an upper layer, and one side far away from the welding head is a lower layer.
3. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 1, wherein: the acquisition step in the step S1 is as follows:
s11, adding CCD linear array cameras on the front side and the back side after the composite current collector (3) is unreeled and before welding;
s12, calculating the distances D1 from the edges of the front and back coated films to the edges of the empty foil area of the composite current collector (3) according to the edge of the empty foil area of the front and back composite current collector (3) and the position of the edge close to the coated film of the empty foil area by using a CCD (charge coupled device) camera;
s13, calculating the widths W1 plus and minus 1 of the plus and minus coating areas (31) according to the shot edge positions of the non-tab side edge and the coating edge close to the empty foil area;
when the welding head is combined and welded, one side close to the welding head is a front side, and the other side far away from the welding head is a back side.
4. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 1, wherein: the acquisition step in the step S2 is as follows:
s21, adding a CCD linear array camera in the front and back welding area (4) after the composite current collector (3) is combined and welded and before the composite current collector is rolled;
s22, calculating the widths W2 of the front and back welding and printing areas (4) and the widths W2 of the upper and lower layers of metal foil edges according to the positions of the two edges of the welding and printing areas (4) and the positions of the upper and lower layers of metal foil edges by a CCD camera, wherein the distances D2 from the outer edges of the welding and printing areas (4) to the outer edges of the metal foil are right outside, D2 from the outer edges of the welding and printing areas, and the distances D2 from the inner edges of the welding and printing areas (4) to the inner edges of the metal foil are right inside and D2 from the inner edges of the metal foil;
s23, calculating the widths W3 of the front and back surface coating areas (31) after welding according to the shot non-tab side edge of the composite current collector (3) and the shot edge position close to the welding area coating;
s24, calculating distances D3 within the welding edge of the welding area (4) from the edge of the coating area (31) to the front side and the back side after welding according to the shot edge position close to the coating film of the welding area and the shot inner edge position of the welding area (4);
wherein, when the combination welding is carried out, one side close to the film coating area (31) is the inner side, and the side far away from the film coating area (31) is the outer side.
5. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 1, wherein: in the step S2, distances D4 from the edge of the front and back welding area (4) to the edge of the coating area (31) are within a front range and within a back range, after combined welding and before rolling, appearance conditions of a welding area are identified through a CCD linear array camera, and appearance flaws are identified: and (4) folding and damaging the upper and lower metal foils after welding and missing welding.
6. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 4, wherein: the calculation formulas of the distances D4 within the front and back welding area (4) from the edge of the coating area (31) to the edge of the front and back welding area in the step S3 are as follows:
d4 plus inner = D3 plus inner- (W1 plus-W3 plus);
d4 trans-endo = D3 trans-endo- (W1 trans-W3 trans);
the adopted data are all data collected in the same section or at the same position before and after welding.
7. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 1, wherein: the calculation method for calculating the dislocation amount of the upper metal foil and the lower metal foil in the step S4 comprises the following steps:
s41, calculating the difference between the positive W2 and the negative W2;
s42, if the absolute value of the difference value between the positive W2 and the negative W2 is less than or equal to 0.2, and the area where the positive W2 and the negative W2 are located has no folds of the upper metal foil and the lower metal foil and is not damaged well; calculating the difference between the outside of the D2 and the difference between the inside of the D2 and the inside of the D2, and taking the larger difference as the dislocation quantity of the upper metal foil and the lower metal foil;
s43, if the absolute value of the positive and negative difference values of W2 is larger than 0.2 or the area where the positive and negative difference values of W2 are located has wrinkles and bad breakage of the upper and lower metal foils, the dislocation amount of the area or the position is not included in the calculation.
8. The method for detecting and adjusting the effect of the current collector combination after welding according to claim 1, wherein: the specific steps of the adjustment in the step S5 are as follows:
s51, if the absolute value of the difference value between the positive W2 and the negative W2 is calculated in the step S4 and is less than or equal to 0.2, and the area where the positive W2 and the negative W2 are located has no wrinkles and bad breakage of the upper and lower metal foils;
calculating the difference value between the minimum value between the positive inner edge and the negative inner edge of the D4 and the distance between the inner edge of the welding area (4) and the edge of the coating area (31) and the design standard median value, and if the difference value is within the range of the set tolerance requirement, the unreeling deviation correction of the composite current collector (3) is not required to be adjusted;
if the difference value exceeds the tolerance requirement range, the unreeling deviation correction of the composite current collector (3) is adjusted according to the difference value;
meanwhile, calculating the difference value of the distance between the D2 positive inner edge, the D2 negative inner edge and the inner edge of the welding area (4) and the distance between the upper and lower metal foil inner edges to a design standard median value, and adjusting the metal foil unreeling deviation correcting system according to the difference value;
s52, if the absolute value of the difference value between the positive value W2 and the negative value W2 is larger than 0.2 or the area where the positive value W2 and the negative value W2 are located has wrinkles and bad damage of the upper metal foil and the lower metal foil, the unreeling deviation correction of the area or the position is adjusted in a feedback mode according to the numerical value before the abnormality does not exist.
9. A current collector combination post-welding effect detection and adjustment system is used for detecting and adjusting the effect of a current collector combination post-welding effect, the current collector combination welding structure is of a layered structure, a composite current collector (3) is arranged in the middle, an upper layer is an upper metal foil (1), and a lower layer is a lower metal foil (2); the method is characterized in that: comprises that
The pre-welding acquisition unit is used for acquiring distances D1 positive and D1 negative between the coating edges of the front and back surfaces of the coated pole piece foil reserving area of the composite current collector (3) and the edges of the composite current collector (3) and the widths W1 positive and W1 negative of the coated film area (31) before welding;
the post-welding acquisition unit is used for acquiring distances D2 just outside, D2 just inside and D2 just inside from the welding edges of the front and back welding areas (4) to the edges of the upper and lower layers of metal foils after welding; the widths W2 of the welding and printing areas (4) on the front side and the back side are positive and negative; the widths W3 of the front and back surface coating areas (31) are positive and negative; collecting distances D3 within the welding edge of the front and back welding area (4) and the edge of the coating area (31) and D3 within the front and back; collecting the appearance of a welding area;
the calculating unit is used for calculating the distances D4 within the front and back welding area (4) from the edge of the coating area (31) and D4 within the back; calculating the dislocation quantity of the upper metal foil and the lower metal foil;
and the judging and adjusting unit is used for adjusting the alignment of the upper metal foil and the lower metal foil and the distance between the welding area (4) and the edge of the coating area (31) according to the distance between the front side welding area (4) and the back side welding area (31), the dislocation amount of the upper metal foil and the lower metal foil and the welding appearance.
10. The post-welding effect detection and adjustment system for current collector assembly of claim 9, wherein: when the combined unit carries out current collector combined welding, the composite current collector (3) is subjected to double-sided coating, a hollow foil area is reserved, and the width of the pure metal foil on the upper layer and the width of the pure metal foil on the lower layer are larger than that of the hollow foil area of the composite current collector (3); when the combined welding is carried out, one side close to the welding head is an upper layer, and one side far away from the welding head is a lower layer.
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| CN116879173A (en) * | 2023-09-08 | 2023-10-13 | 宁德时代新能源科技股份有限公司 | Cathode plate detection system and method |
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| CN116879173A (en) * | 2023-09-08 | 2023-10-13 | 宁德时代新能源科技股份有限公司 | Cathode plate detection system and method |
| CN116879173B (en) * | 2023-09-08 | 2024-02-02 | 宁德时代新能源科技股份有限公司 | Cathode plate detection system and method |
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