Method and system for evaluating welding quality of metal grid line and welding strip

Abstract

The invention provides a welding quality evaluation method and evaluation system for a metal grid line and a welding strip, and relates to the technical field of solar cells. Specifically, the method for evaluating the welding quality of the metal grid line and the welding strip comprises the following steps: constructing a resistance model of a target object, obtaining a relational expression among the resistance R between the welding strips of the preset distance D of the target object, the grid line resistance Rf of the unit distance of the grid line, the contact resistance Rc between the grid line and the welding strips, and the resistance Rr of the welding strips extending out of the edge of the body; detecting a resistance value R between the welding strips at different intervals D; obtaining a relational graph between the resistance value R and the distance D according to a detection result; and evaluating the welding quality of the target object according to the relational expression and the relational graph. According to the method, the welding process can be improved according to the evaluation result, so that the welding quality is improved, and the performance of the whole battery module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular to a welding quality assessment method and system for metal grid lines and welding strips. Background Art

[0002] After the battery cells are manufactured, they need to be welded together to form a battery cell group, and then packaged to form a battery module. The quality of welding affects the welding resistance, and the welding resistance affects the performance of the entire battery module. The existing TLM contact resistance test method is only applicable to testing the contact resistance of thin layer materials on the battery cells, and cannot test the contact resistance between the metal grid lines and welding strips of photovoltaic battery cells. The contact resistance can reflect the welding quality. If the welding resistance is unknown, the welding quality of the entire battery module cannot be known, and the entire welding process cannot be improved to improve the performance of the entire battery module. Summary of the invention

[0003] An object of the first aspect of the present invention is to provide a method for evaluating the welding quality of metal grid lines and welding strips, so as to solve the problem in the prior art that the welding quality of the entire battery module cannot be known.

[0004] A second aspect of the present invention aims to provide a welding quality assessment system for metal grid lines and welding strips.

[0005] In particular, the present invention also provides a method for evaluating the welding quality of metal grid lines and welding strips, which is used to evaluate the welding quality of a target object, wherein the target object includes a battery cell, a battery string or a finished solar cell; the target object includes a body, at least one grid line and a plurality of welding strips that are parallel to each other and arranged at intervals; the at least one grid line is arranged at the body; each of the welding strips is in contact with all of the grid lines, and at least part of the welding strips extends outside the body;

[0006] The evaluation methods include:

[0007] A resistance model of the target object is constructed to obtain a relationship between the resistance R between the welding strips at a preset spacing D of the target object, the grid line resistance Rf per unit distance of the grid line, the contact resistance Rc between the grid line and the welding strip, and the resistance Rr of the welding strip extending from the edge of the body; wherein the relationship is:

[0008] R = (D × Rf + 2Rc) / n + Rr;

[0009] Detecting the resistance value R between the welding strips with different spacings D;

[0010] A relationship diagram between the resistance value R and the distance D is obtained according to the detection result; wherein the relationship diagram is a line diagram formed by connecting multiple points with the resistance value R as the ordinate and the distance D as the abscissa to form corresponding points;

[0011] The welding quality of the target object is evaluated according to the relational expression and the relational graph.

[0012] Optionally, the step of constructing the resistance model of the target object to obtain the relationship includes:

[0013] Obtaining a corresponding circuit diagram according to the structure of the target object;

[0014] The relationship is obtained according to the circuit diagram.

[0015] Optionally, obtaining a corresponding circuit diagram according to the structure of the target object includes:

[0016] When the target object only includes n=1 gate lines, the circuit diagram includes a circuit formed by a first resistor located in the main body and a second resistor of a welding strip extending from the main body connected in series; wherein the first resistor is the sum of the resistance of the gate line between two welding strips with a distance D (D×Rf) and the contact resistance 2Rc between the welding strip and the gate line.

[0017] Optionally, the step of obtaining a corresponding circuit diagram according to the structure of the target object includes:

[0018] When the target object includes n gate lines greater than 1, the circuit diagram is a circuit formed by connecting a first resistor in series with a third resistor, then connecting the first resistor in parallel, further connecting the next third resistor in series, then connecting the next first resistor in parallel, until connecting the last third resistor in series with the last first resistor, and then connecting the second resistor in series; wherein the first resistor is the sum of the resistance of the gate line between two welding strips with a distance of D (D×Rf) and the contact resistance 2Rc between the welding strip and the gate line; the second resistor is the resistance of the welding strip extending from the body; and the third resistor is the resistance of the welding strip between the two gate lines 2Rs;

[0019] The resistor 2Rs of the welding strip between two gate lines in the third resistor of the sub-unit is removed to form a circuit including only n first resistors connected in parallel and then connected in series with the second resistor.

[0020] Optionally, the step of evaluating the welding quality of the target object according to the relationship expression and the relationship diagram includes:

[0021] The welding quality of different positions of the target object is evaluated according to the relationship diagram of the same target object.

[0022] Optionally, the step of evaluating the welding quality of different positions of the target object according to the relationship diagram of the same target object includes:

[0023] Determining whether a line in the relationship diagram is a straight line;

[0024] If so, the welding quality at different positions of the target object is the same;

[0025] If not, the welding quality at different positions of the target object is different.

[0026] Optionally, the step of evaluating the different welding qualities at different positions of the target object further includes:

[0027] Acquire the position of the inflection point having an angle less than a preset angle according to the lines in the relationship diagram;

[0028] When the protrusion of the inflection point is toward the position above the line, the welding quality at the position corresponding to the point is greater than the welding quality at other positions;

[0029] When the protrusion of the inflection point is toward a position below the line, the welding quality at the position corresponding to the point is less than the welding quality at other positions.

[0030] Optionally, the step of evaluating the welding quality of the target object according to the relationship expression and the relationship diagram includes:

[0031] The welding qualities of different objects are evaluated according to the relationship diagrams of different objects.

[0032] Optionally, the step of evaluating the welding quality of different target objects according to the relationship diagrams of different target objects includes:

[0033] Obtaining a relationship diagram in which the lines of the relationship diagram of the target object are straight lines;

[0034] Comparing the intercepts of the straight lines and the ordinate of the relationship diagrams of different target objects;

[0035] The welding quality of the target object with a large intercept is lower than the welding quality of the target object with a small intercept.

[0036] In particular, the present invention further provides a metal grid line and welding strip welding quality assessment system, comprising assessing the welding quality of the metal grid line and welding strip of the target object according to the metal grid line and welding strip welding quality assessment method described above.

[0037] In this scheme, by constructing a resistance model, the relationship between the resistance between the welding strips at a preset spacing and the resistance of each part is obtained. It can be seen from the relationship that the resistance between the welding points at a preset spacing is linearly related to the preset spacing. Then, by detecting the resistance values ​​between the welding strips at different spacings, a relationship diagram between the resistance value and the spacing is obtained. After obtaining the relationship diagram, it can be known from the relationship that the ideal relationship diagram should be a straight line, and the slope of the straight line is the grid line resistance Rf per unit distance, and the intercept is the sum of the contact resistance Rc and the resistance Rr of the welding strip extending from the edge of the body, and the resistance Rr of the welding strip extending from the edge of the body can be obtained by detection, thereby not only the grid line resistance Rf per unit distance can be obtained, but also the contact resistance Rc can be calculated, and the welding quality of the target object can be evaluated by observing the relationship diagram, and then the welding process can be improved according to the evaluation results to improve the welding quality, thereby improving the performance of the entire battery module.

[0038] This solution can further improve the welding process by analyzing the welding quality at different positions of the same target object or the welding quality between different targets, thereby improving the welding quality and the performance of the entire battery module.

[0039] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0041] Figure 1 is a schematic structural diagram of a target object according to a specific embodiment of the present invention;

[0042] Figure 2 is a schematic structural diagram of a target object according to another specific embodiment of the present invention

[0043] Figure 3 is a schematic flow chart of a method for evaluating welding quality of metal grid lines and welding strips according to a specific embodiment of the present invention;

[0044] Figure 4 is a schematic flow chart of constructing a resistance model of a target object to obtain a relational expression according to a specific embodiment of the present invention;

[0045] Figure 5 is a circuit diagram of a target object according to a specific embodiment of the present invention;

[0046] Figure 6is a circuit diagram of a target object according to another specific embodiment of the present invention;

[0047] Figure 7 yes Figure 6 Simplified circuit diagram;

[0048] Figure 8 is a schematic flow chart of evaluating welding quality at different positions of a target object based on a relationship diagram of the same target object according to a specific embodiment of the present invention;

[0049] Fig. 9 is a graph showing the relationship between resistance and spacing according to a specific embodiment of the present invention;

[0050] Fig.10 is a graph showing the relationship between resistance and spacing according to another specific embodiment of the present invention;

[0051] Fig.11 is a schematic flow chart of evaluating welding quality of different targets according to a relationship diagram of different targets according to a specific embodiment of the present invention;

[0052] Fig.12 is a relationship diagram of different targets according to a specific embodiment of the present invention.

[0053] Description of reference numerals:

[0054] Target 100; body 110; gate line 120; welding strip 130; first resistor 200; second resistor 300; third resistor 400. DETAILED DESCRIPTION

[0055] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] As a specific embodiment of the present invention, Figure 1 and Figure 2As shown, the present embodiment provides a method for evaluating the welding quality of metal grid lines and welding strips. The evaluation method is used to evaluate the welding quality of a target object. Specifically, the target object of the present embodiment may be a battery cell, a battery string or a finished solar cell product. Specifically, each target object 100 may include a body 110, at least one grid line 120 and a plurality of welding strips 130 that are parallel to each other and arranged at intervals. At least one grid line 120 is disposed at the body 110. Each welding strip 130 is in contact with all the grid lines 120, and at least part of the welding strip 130 extends outside the body 110.

[0057] Specifically, Figure 3 As shown, the evaluation method of this embodiment may include:

[0058] Step S100, constructing a resistance model of the target object 100, obtaining a relationship between the resistance R between the soldering strips 130 at a preset spacing D of the target object 100, the gate line resistance Rf per unit distance of the gate line 120, the contact resistance Rc between the gate line 120 and the soldering strip 130, and the resistance Rr of the soldering strip 130 extending out of the edge of the body 110; wherein the relationship is:

[0059] R = (D × Rf + 2Rc) / n + Rr;

[0060] Step S200, detecting the resistance value R between the solder strips 130 with different spacings D;

[0061] Step S300, obtaining a relationship diagram between the resistance value R and the distance D according to the detection result; wherein the relationship diagram is a line diagram formed by connecting corresponding points with the resistance value R as the ordinate and the distance D as the abscissa;

[0062] Step S400 , evaluating the welding quality of the target object 100 according to the relationship expression and the relationship diagram.

[0063] Specifically, in the present embodiment, by constructing a resistance model, a relational expression between the resistance of the welding strip 130 at a preset spacing and the resistance of each part is obtained. It can be seen from the relational expression that the resistance between the welding points at the preset spacing and the preset spacing are in a linear relationship. Then, by detecting the resistance value between the welding strips 130 at different spacings, a relational graph between the resistance value and the spacing is obtained. After obtaining the relational graph, it can be known according to the relational expression that the ideal relational graph should be a straight line, and the slope of the straight line is the grid line resistance Rf per unit distance, and the intercept is the sum of the contact resistance Rc and the resistance Rr of the welding strip 130 extending out of the edge of the body 110, and the resistance Rr of the welding strip 130 extending out of the edge of the body 110 can be obtained by detection, thereby not only the grid line resistance Rf per unit distance can be obtained, but also the contact resistance Rc can be calculated, and the welding quality of the target object 100 can be evaluated by observing the relational graph, and then the welding process can be improved according to the evaluation result to improve the welding quality.

[0064] As a specific embodiment of the present invention, Figure 4 As shown, in step S100 of this embodiment, the step of constructing a resistance model of the target object 100 to obtain a relationship may include:

[0065] Step S110, obtaining a corresponding circuit diagram according to the structure of the target object 100;

[0066] Step S120, obtaining a relational expression according to the circuit diagram.

[0067] Specifically, step S110 of obtaining a corresponding circuit diagram according to the structure of the target object 100 may include:

[0068] When the target object 100 only includes n=1 gate lines 120, the target object (which may be a battery cell) has a structure such as Figure 1 As shown, the circuit diagram is as Figure 5 As shown, the circuit diagram at this time includes a circuit formed by a first resistor 200 located in the main body 110 and a second resistor 300 of the welding strip 130 extending out of the main body 110 connected in series; wherein the first resistor 200 is the sum of the gate line resistance (D×Rf) between the two welding strips 130 with a distance D and the contact resistance 2Rc between the welding strip 130 and the gate line 120.

[0069] Specifically, when the target object has only one gate line 120, the structure of the target object (eg Figure 1 1) is two solder strips 130 and one gate line 120. A detection device is used to connect between the two extended solder strips 130 to detect the resistance. Figure 5 In the circuit diagram, the first resistor 200 only includes the gate line resistance between the two welding strips 130 and the contact resistance between the gate line 120 and the welding strip 130. At this time, the relationship can be: R = (D × Rf + 2Rc) / n + Rr, and n = 1.

[0070] Specifically, step S110 of obtaining a corresponding circuit diagram according to the structure of the target object 100 may include:

[0071] When the target object 100 includes n gate lines 120 greater than 1, the structure is as follows Figure 2 As shown, the circuit diagram at this time is as follows Figure 6As shown, the circuit diagram is a circuit formed by connecting the first resistor 200 in series with the third resistor 400, then connecting the first resistor 200 in parallel, further connecting the next third resistor 400 in series, and then connecting the next first resistor 200 in parallel, until connecting the last third resistor 400 in series with the last first resistor 200, and then connecting the second resistor 300 in series; wherein the first resistor 200 is the sum of the resistance (D×Rf) of the grid line between two welding strips with a distance D and the contact resistance 2Rc between the welding strip 130 and the grid line 120. The second resistor 300 is the resistance of the welding strip 130 extending out of the body 110. The third resistor 400 is the resistance 2Rs of the welding strip 130 between the two grid lines 120. At this time, the relationship can be R=[(D×Rf+2Rc) n +2Rs×(D×Rf+2Rc) n-1 ] / [n×(D×Rf+2Rc) n - 1 +2Rs×(n-1)×(D×Rf+2Rc) n-2 ]+Rr, and n is an integer greater than 1.

[0072] The resistor 2Rs of the welding strip 130 between two gate lines 120 in the third resistor 400 of the sub-unit is removed, forming a circuit including only n first resistors 200 connected in parallel and then connected in series with the second resistor 300 (eg Figure 7 At this time, the relationship equation of the resistance 2Rs of the soldering strip 130 between the two gate lines 120 is removed, and R=(D×Rf+2Rc) / n+Rr, where n is an integer greater than 1.

[0073] In this embodiment, when there are multiple gate lines 120 in the target object 100, the structure of the target object is multiple gate lines 120 parallel to each other, and two welding strips 130 that are in contact with the multiple gate lines 120. In this way, when the detection device detects the resistance between the two welding strips 130, the circuit formed is a circuit diagram (such as Figure 6 ) is a circuit formed by connecting the first resistor 200 in series with the third resistor 400, then connecting the first resistor 200 in parallel, further connecting the next third resistor 400 in series, and then connecting the next first resistor 200 in parallel, until connecting the last third resistor 400 in series with the last first resistor 200, and then connecting the second resistor 300 in series. Since the resistance 2Rs of the welding strip 130 between the two gate lines 120 can be ignored compared to the contact resistance 2Rc, the circuit diagram can be simplified by removing the resistance 2Rs of the welding strip 130 between the two gate lines 120 in the third resistor 400. In this way, a circuit is formed that only includes n first resistors 200 connected in parallel and then connected in series with the second resistor 300, that is, as shown in FIG. Figure 7The final relationship can be combined with the relationship for n=1 to form:

[0074] R=(D×Rf+2Rc) / n+Rr; wherein n is a natural number.

[0075] As a specific embodiment of the present invention, the step S400 of evaluating the welding quality of the target object 100 according to the relationship expression and the relationship diagram may include:

[0076] Step S410 , evaluating welding qualities at different positions of the target object 100 according to the relationship diagram of the same target object 100 .

[0077] As a specific embodiment of the present invention, Figure 8 As shown, step S410 of evaluating the welding quality of different positions of the target object 100 according to the relationship diagram of the same target object 100 includes:

[0078] Step S411, determining whether the line in the relationship diagram is a straight line;

[0079] If yes, execute step S412, if no, execute step S413.

[0080] Step S412, the welding quality of different positions of the target object 100 is the same;

[0081] In step S413, the welding qualities at different positions of the target object 100 are different.

[0082] Specifically, if the welding quality at each position is the same, the contact resistance between the welding strip 130 and the gate line 120 at each position is the same, so a straight line is finally formed (eg Fig. 9 As shown). Of course, in the actual process of detecting the resistance, there will be errors. Within the allowable error range, the line is a straight line or a straight line-like line, or the angle at the inflection point is close to 180°, for example, greater than 165°, which can be considered a straight line. Therefore, by observing whether the line in the relationship diagram is a straight line, it can be judged whether the welding quality at different positions of the target object 100 is the same.

[0083] Specifically, in this embodiment, if the welding quality at different positions of the same target object 100 is the same, the welding resistance at different positions is also the same, which is finally reflected in the relationship diagram as the same intercept between the line and the vertical axis. If the relationship diagram of the entire target object 100 is a straight line, it means that the slope of each place is consistent, and the intercept of the formed straight line is also consistent, indicating that the welding quality is the same.

[0084] When the relationship diagram formed is not a straight line (such as Fig.10 As shown in Figure 2, the slope and intercept at different positions may also be different, which means that the welding quality at different positions is different.

[0085] The steps of evaluating the welding quality at different positions of the target object 100 also include:

[0086] Obtaining the position of the inflection point having an angle less than a preset value according to the lines in the relationship diagram;

[0087] When the protrusion of the inflection point is toward the upper part of the line, the welding quality at the position corresponding to this point is greater than the welding quality at other positions;

[0088] When the protrusion of the inflection point is toward the position below the line, the welding quality at the position corresponding to this point is less than the welding quality at other positions.

[0089] More specifically, since different points are connected to each other, the point value will deviate from the position of the straight line at the position where the welding quality is different. In this way, a broken line will be formed after connecting multiple points to each other. Of course, within the error range, when the angle a of the broken line at the inflection point is close to 180°, it can be considered as a straight line. Only when the angle a at the inflection point is less than a preset angle, it is considered that the situation is caused by the welding quality. Specifically, the preset angle of this embodiment can be about 165°.

[0090] The protrusion of the inflection point is toward the upper part of the line, indicating that the resistance value detected at this time is greater than the normal resistance value, and the contact resistance is connected in parallel in the circuit, so it means that the contact resistance at this time is smaller, and the welding quality at this position is better. On the contrary, the protrusion of the inflection point is toward the lower part of the line, indicating that the resistance value detected here is less than the normal resistance value, indicating that the welding resistance here is larger, further indicating that the welding quality here is poor.

[0091] As a specific embodiment of the present invention, step S400 of this embodiment of evaluating the welding quality of the target object 100 according to the relationship expression and the relationship diagram includes:

[0092] Step S420 , evaluating welding qualities of different target objects 100 according to the relationship diagrams of different target objects 100 .

[0093] Specifically, Fig.11 As shown, step S420 of evaluating the welding quality of different target objects 100 according to the relationship diagrams of different target objects includes:

[0094] Step S421, obtaining a relationship diagram of the target object 100 in which the lines of the relationship diagram are straight lines;

[0095] Step S422, comparing the intercepts of the straight lines of the relationship diagrams of different target objects 100;

[0096] In step S423 , the welding quality of the target object 100 with a larger intercept is less than the welding quality of the target object 100 with a smaller intercept.

[0097] Specifically, when evaluating the welding quality of different target objects 100, it can be observed whether the lines in the relationship diagram are straight lines. For non-linear welding cells, the reasons for the stability of the welding parts can be analyzed separately and further improved. For different target objects 100, the lines in the relationship diagram are straight lines. The intercepts of the lines and the vertical axis are used to obtain the contact resistance of the target object 100, and the welding resistance of different target objects (such as Fig.12 By comparing the contact resistances of different targets 100, the welding quality of different targets 100 is evaluated, and by comparing the welding processes of different targets 100, the direction of improvement is found to improve the performance of the battery module.

[0098] Generally speaking, since the intercept of the straight line is the sum of the contact resistance and the resistance of the welding strip 130, the resistance of the welding strip 130 is generally the same, and therefore, the target object 100 with a large intercept indicates that its contact resistance is large, and the welding quality is worse than that of the target object 100 with a small intercept (that is, the contact resistance is small). By comparing, the welding process of the target object 100 with poor welding quality is compared, and then the improvement direction can be analyzed to improve the performance of the battery cell.

[0099] In addition, the resistance per unit length of the gate line 120 can be known according to the slope in the relationship diagram of the target object 100, and the quality of the gate line 120 can be evaluated. The preparation process of the gate line 120 can be adjusted according to the resistance of the gate line 120, thereby improving the performance of the target object.

[0100] This embodiment can further improve the welding process by analyzing the welding quality at different positions of the same target object 100 or the welding quality between different targets, thereby improving the welding quality and the performance of the entire battery module.

[0101] As a specific embodiment of the present invention, this embodiment also provides a welding quality assessment system for metal grid lines 120 and welding strips 130. The assessment system can include assessing the welding quality of metal grid lines 120 and welding strips 130 of the target object 100 according to the welding quality assessment method for metal grid lines 120 and welding strips 130 described above.

[0102] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for evaluating the welding quality of metal grid lines and welding strips, It is characterized in that Used to evaluate the welding quality of a target object, the target object includes a battery cell, a battery string or a finished solar cell, each of the target objects includes a body, at least one grid line and a plurality of welding strips parallel to each other and arranged at intervals; the at least one grid line is arranged at the body; Each of the welding strips is in contact with all the grid lines, and at least a portion of the welding strips extends outside the body; The evaluation methods include: A resistance model of the target object is constructed to obtain a relationship between the resistance R between the welding strips at a preset spacing D of the target object, the grid line resistance Rf per unit distance of the grid line, the contact resistance Rc between the grid line and the welding strip, and the resistance Rr of the welding strip extending from the edge of the body; wherein the relationship is: R = (D × Rf + 2Rc) / n + Rr; Detecting the resistance value R between the welding strips with different spacings D; A relationship diagram between the resistance value R and the distance D is obtained according to the detection result; wherein the relationship diagram is a line diagram formed by connecting multiple points with the resistance value R as the ordinate and the distance D as the abscissa to form corresponding points; The welding quality of the target object is evaluated according to the relational expression and the relational graph.

2. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 1, It is characterized in that The step of constructing the resistance model of the target object to obtain the relationship includes: Obtaining a corresponding circuit diagram according to the structure of the target object; The relationship is obtained according to the circuit diagram.

3. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 2, It is characterized in that The step of obtaining a corresponding circuit diagram according to the structure of the target object comprises: When the target object only includes n=1 gate lines, the circuit diagram includes a circuit formed by a first resistor located in the main body and a second resistor of a welding strip extending from the main body connected in series; wherein the first resistor is the sum of the resistance of the gate line between two welding strips with a distance D (D×Rf) and the contact resistance 2Rc between the welding strip and the gate line.

4. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 2, It is characterized in that The step of obtaining a corresponding circuit diagram according to the structure of the target object comprises: When the target object includes n gate lines greater than 1, the circuit diagram is a circuit formed by connecting a first resistor in series with a third resistor, then connecting the first resistor in parallel, further connecting the next third resistor in series, then connecting the next first resistor in parallel, until connecting the last third resistor in series with the last first resistor, and then connecting the second resistor in series; wherein the first resistor is the sum of the resistance of the gate line between two welding strips with a distance of D (D×Rf) and the contact resistance 2Rc between the welding strip and the gate line; the second resistor is the resistance of the welding strip extending from the body; and the third resistor is the resistance of the welding strip between the two gate lines 2Rs; The third resistor 2Rs of the subunit is removed to form a circuit including only n first resistors connected in parallel and then connected in series with the second resistor.

5. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 1, It is characterized in that The step of evaluating the welding quality of the target object according to the relational expression and the relational diagram comprises: The welding quality of different positions of the target object is evaluated according to the relationship diagram of the same target object.

6. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 5, It is characterized in that The step of evaluating the welding quality of different positions of the target object according to the relationship diagram of the same target object comprises: Determining whether a line in the relationship diagram is a straight line; If so, the welding quality at different positions of the target object is the same; If not, the welding quality at different positions of the target object is different.

7. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 1, It is characterized in that The step of evaluating the welding quality of different positions of the target object also includes: Acquire the position of the inflection point having an angle less than a preset angle according to the lines in the relationship diagram; When the protrusion of the inflection point is toward the position above the line, the welding quality at the position corresponding to the point is greater than the welding quality at other positions; When the protrusion of the inflection point is toward a position below the line, the welding quality at the position corresponding to the point is less than the welding quality at other positions.

8. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 1, It is characterized in that The step of evaluating the welding quality of the target object according to the relational expression and the relational diagram comprises: The welding qualities of different objects are evaluated according to the relationship diagrams of different objects.

9. The method for evaluating the welding quality of metal grid lines and welding strips according to claim 8, It is characterized in that The step of evaluating the welding quality of different target objects according to the relationship diagrams of different target objects comprises: Obtaining a relationship diagram in which the lines of the relationship diagram of the target object are straight lines; Comparing the intercepts of the straight lines and the ordinate of the relationship diagrams of different target objects; The welding quality of the target object with a large intercept is lower than the welding quality of the target object with a small intercept.

10. A welding quality assessment system for metal grid lines and welding strips, It is characterized in that The method comprises evaluating the welding quality of the metal grid line and the welding strip of the target object according to the welding quality evaluation method of the metal grid line and the welding strip as described in any one of claims 1 to 9.

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