A battery string welding method, device and string welder

Abstract

The application provides a battery string welding method, a device and a string welding machine, wherein the battery string welding method is used for welding battery pieces into a string, the battery pieces are provided with grid lines, and the battery string welding method comprises the following steps: stacking the welding ribbons and the battery pieces according to a predetermined rule, and ensuring that each welding ribbon covers the grid lines on the corresponding battery piece; pressing the welding ribbons on the grid lines of the corresponding battery pieces through a pressing needle; and electrifying the welding ribbons to make the welding ribbons generate heat and then be welded on the grid lines of the corresponding battery pieces. According to the battery string welding method, the welding ribbons are electrified to generate heat, so that the solder on the surface of the welding ribbons is melted and adhered to the corresponding battery pieces. Compared with the traditional battery string welding method, the battery string welding method can ensure the uniformity of the temperature of the welding ribbons, so that the welding quality between the welding ribbons and the grid lines on the battery pieces is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery production, in particular to a battery string welding method, device and welding machine. BACKGROUND

[0002] The traditional battery string welding process generally implements heating on the welding strip and the battery piece to weld the welding strip and the battery piece together, for example, an infrared lamp box is used to irradiate the welding strip and the battery piece, so that the tin on the welding strip is melted to adhere the welding strip to the corresponding battery piece.

[0003] The main problem of the traditional battery string welding method is that it is difficult to uniformly heat the welding strip, and virtual welding points are easily generated between the welding strip and the battery piece during the welding process, which reduces the welding quality of the battery string. SUMMARY

[0004] In view of the above defects of the traditional battery string welding method, the first aspect of the present application provides a battery string welding method, and the technical scheme is as follows:

[0005] A battery string welding method for welding battery pieces into a string, the battery pieces are provided with grid lines, and the battery string welding method comprises the following steps:

[0006] Stacking the welding strip and the battery piece according to a predetermined rule, and making each welding strip cover the grid line on the corresponding battery piece;

[0007] Pressing the welding strip on the grid line of the corresponding battery piece by a pressing needle;

[0008] Passing current through the welding strip to make the welding strip heat and be welded on the grid line of the corresponding battery piece.

[0009] The battery string welding method of the present application passes current through the welding strip to make the welding strip heat and melt the solder on the surface of the welding strip, and adhere to the corresponding battery piece. Compared with the traditional battery string welding method, the battery string welding method of the present application can ensure the uniformity of the temperature of the welding strip, thereby improving the welding quality between the welding strip and the grid line on the battery piece.

[0010] Optionally, pressing the welding strip on the grid line of the corresponding battery piece by the pressing needle comprises elastically pressing the welding strip on the grid line of the corresponding battery piece by the pressing needle.

[0011] The elastic pressing of the welding strip is realized, which can ensure that the welding strip is pressed on the grid line of the corresponding battery piece while preventing damage to the battery piece.

[0012] In some embodiments, stacking the welding strip and the battery piece according to a predetermined rule comprises: stacking the front half of the welding strip on the front surface of the front battery piece of the two adjacent battery pieces, and stacking the back surface of the rear battery piece of the two adjacent battery pieces on the back half of the welding strip.

[0013] The power supply to the solder strip includes:

[0014] The first end of the solder strip is electrically connected to the first electrode of the power supply, and the second end of the solder strip is electrically connected to the second electrode of the power supply; or

[0015] The first end of the solder strip is electrically connected to the first electrode of the power supply, the middle part of the solder strip is electrically connected to the second electrode of the power supply, and the second end of the solder strip is electrically connected to the first electrode of the power supply; or

[0016] The first end of the first half of the solder strip is electrically connected to the first electrode of the power supply, the second end of the first half of the solder strip is electrically connected to the second electrode of the power supply, and the first end of the second half of the solder strip is electrically connected to the second electrode of the power supply, and the second end of the second half of the solder strip is electrically connected to the first electrode of the power supply.

[0017] The polarity of the first electrode and the second electrode is opposite.

[0018] Three power supply welding methods are provided for a battery string formed by stringing battery pieces that require welding of the solder strip on both surfaces, which can weld the solder strip to the front surface and the back surface of the corresponding adjacent two battery pieces. The second and third welding methods respectively implement local power supply to the first half and the second half of the solder strip to weld the first half and the second half of the solder strip to the front surface of the preceding battery piece and the back surface of the following battery piece, which can further improve the welding quality of the solder strip.

[0019] In some embodiments, the solder strip and the battery piece are stacked according to a predetermined rule, including: stacking the first half of the solder strip on the front surface of the preceding battery piece of the adjacent two battery pieces, and stacking the second half of the solder strip on the front surface of the following battery piece of the adjacent two battery pieces; the power supply to the solder strip includes: electrically connecting the two ends of the solder strip to the first electrode and the second electrode of the power supply, respectively, wherein the polarity of the first electrode and the second electrode is opposite.

[0020] A simple power supply welding method is provided for a battery string (IBC battery string) formed by stringing battery pieces that require welding of the solder strip on only one surface, which can weld the solder strip to the front surface of the adjacent two battery pieces.

[0021] The second aspect of the present application provides another battery string welding method for welding battery pieces into a string, the battery pieces being provided with pad points, the battery string welding method comprising:

[0022] Stacking the solder strip and the battery piece according to a predetermined rule, and making each solder strip cover the pad points on the corresponding battery piece;

[0023] Powering the solder strip to make the solder strip heat and be welded to the pad points on the corresponding battery piece.

[0024] The battery string welding method of the present application, by passing current to the welding strip, causes the welding strip to generate heat, thereby melting the solder on its surface and bonding with the corresponding battery piece. Compared with the traditional battery string welding method, the battery string welding method of the present application can ensure the uniformity of the temperature of the welding strip, thereby improving the welding quality between the welding strip and the solder pad points on the battery piece.

[0025] In some embodiments, when the welding strip is passed through, the battery string welding method further comprises pressing the welding strip against the corresponding solder pad points.

[0026] By pressing the welding strip against the corresponding solder pad points, the welding quality between the welding strip and the solder pad points is further improved, and false welding is prevented.

[0027] In some embodiments, the welding strip and the battery piece are stacked according to a predetermined rule, including: stacking the front half of the welding strip on the front surface of the front battery piece of the adjacent two battery pieces, and stacking the back surface of the rear battery piece of the adjacent two battery pieces on the rear half of the welding strip; passing current through the welding strip includes:

[0028] connecting the first end of the welding strip to the first electrode of the power supply, and connecting the second end of the welding strip to the second electrode of the power supply; or

[0029] connecting the first end of the welding strip to the first electrode of the power supply, connecting the middle part of the welding strip to the second electrode of the power supply, and connecting the second end of the welding strip to the first electrode of the power supply; or

[0030] connecting the first end of the front half of the welding strip to the first electrode of the power supply, connecting the second end of the front half of the welding strip to the second electrode of the power supply, connecting the first end of the rear half of the welding strip to the second electrode of the power supply, and connecting the second end of the rear half of the welding strip to the first electrode of the power supply; or

[0031] using a first electrode needle connected to the first electrode of the power supply and a second electrode needle connected to the second electrode of the power supply to perform local current passing on the welding strip covering the solder pad points from both sides of the solder pad points;

[0032] wherein the polarity of the first electrode and the second electrode is opposite.

[0033] Four power-on welding methods are provided for a battery string formed by stringing battery pieces each of which needs to be welded on both sides with a welding strip. The four power-on welding methods can all weld the welding strip to the front side and the back side of the corresponding adjacent two battery pieces. The second and third welding methods respectively implement partial power-on to the front half and the rear half of the welding strip to weld the front half and the rear half of the welding strip to the front side of the preceding battery piece and the back side of the following battery piece, which can improve the welding quality of the welding strip. The fourth welding method implements fixed-point welding of the welding strip and the corresponding welding pad points by implementing partial power-on to the welding strip on the welding pad points, thereby further improving the welding quality between the welding strip and the welding pad points.

[0034] In some embodiments, the welding strip and the battery pieces are stacked according to a predetermined rule, including: stacking the front half of the welding strip on the front side of the preceding battery piece of the adjacent two battery pieces, and stacking the rear half of the welding strip on the front side of the following battery piece of the adjacent two battery pieces.

[0035] The power-on to the welding strip includes:

[0036] The two ends of the welding strip are respectively connected to the first electrode and the second electrode of the power supply; or

[0037] The first electrode needle connected to the first electrode of the power supply and the second electrode needle connected to the second electrode of the power supply are used to implement the power-on to the welding strip covering the welding pad points from both sides of the welding pad points.

[0038] The polarity of the first electrode and the second electrode is opposite.

[0039] A simple power-on welding method is provided for a battery string (IBC battery string) formed by stringing battery pieces each of which needs to be welded on one side with a welding strip.

[0040] The third aspect of the present application provides a battery string welding device, which includes a first electrode needle and a second electrode needle, wherein:

[0041] The first electrode needle is connected to the first electrode of the power supply, and the second electrode needle is connected to the second electrode of the power supply. The first electrode needle and the second electrode needle are configured to power on the welding strip to weld the welding strip to the corresponding battery piece to form a battery string.

[0042] The polarity of the first electrode and the second electrode is opposite.

[0043] The power-on to the welding strip between the first electrode needle and the second electrode needle is achieved by crimping the welding strip from the two positions, so that the welding strip between the first electrode needle and the second electrode needle is welded to the grid line or the welding pad point at the corresponding position.

[0044] In some embodiments, the battery string welding device further comprises a pressing needle arranged between the first electrode needle and the second electrode needle, the pressing needle being used to press the welding strip against the pad point.

[0045] By arranging the pressing needle between the first electrode needle and the second electrode needle, the welding strip can be pressed against the pad point, further ensuring the welding quality of the welding strip and the pad point, and preventing the occurrence of false welding.

[0046] The application further provides a battery string welding machine, comprising a battery piece feeding device, a welding strip feeding device, a welding conveying device and the battery string welding device according to any one of the preceding items, wherein:

[0047] The welding strip feeding device and the battery piece feeding device are used to stack the welding strip and the battery piece according to a predetermined rule on the welding conveying device, and make each welding strip cover the pad point on the corresponding battery piece;

[0048] The welding conveying device is used to convey the stacked welding strip and battery piece to a welding station;

[0049] The battery string welding device is used to electrify the welding strip, so as to weld the welding strip and the battery piece into a battery string.

[0050] Through the cooperation of the battery piece feeding device, the welding strip feeding device, the welding conveying device and the battery string welding device, the battery string welding machine realizes the automatic welding of the battery piece into a string, and ensures the welding quality of the welding strip and the battery piece. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a side view of a battery string welded by battery pieces which need to be welded by welding strips on both the front and back surfaces;

[0052] Figure 2 is a top view of a battery string welded by battery pieces which need to be welded by welding strips on both the front and back surfaces;

[0053] Figure 3 is a top view of a battery string welded by battery pieces (IBC battery pieces) which need to be welded by welding strips on only one surface;

[0054] Figure 4 is a structure diagram of the battery string welding device provided by the application in one embodiment;

[0055] Figure 5 is a structure diagram of the battery string welding device provided by the application in another embodiment. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned objects, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0057] The traditional battery string welding method is difficult to realize uniform heating of the welding strip, and virtual welding points are prone to occur between the welding strip and the battery sheet during the welding process, thereby reducing the welding quality of the battery string.

[0058] In order to solve the above technical problems existing in the traditional battery string welding method, the present application provides a battery string welding method, which heats the welding strip by electrifying the welding strip, and then welds the welding strip on the corresponding battery sheet, thereby improving the welding quality. The battery string welding method of the present application will be described in the following four embodiments.

[0059] First embodiment

[0060] The battery sheet in this embodiment is provided with a grid line, and the welding strip needs to be welded on both the front and back surfaces of the battery sheet. The battery string welding method of this embodiment is used to weld the battery sheet into a string, which comprises the following steps:

[0061] S101, stack the welding strip and the battery sheet according to the predetermined rule, and make each welding strip cover the grid line on the corresponding battery sheet.

[0062] As shown in Figure 1 and Figure 2 , the stacking rule of the welding strip 301 and the battery sheet in this embodiment is that the front half of the welding strip 301 is stacked on the front surface of the front battery sheet 401 in the adjacent two battery sheets, and the back surface of the rear battery sheet 402 in the adjacent two battery sheets is stacked on the back half of the welding strip.

[0063] The back surface of the head battery sheet is stacked on the back half of the head welding strip 302, and the front half of the tail welding strip 303 is stacked on the front surface of the tail battery sheet.

[0064] S102, press the welding strip tightly on the grid line of the corresponding battery sheet by the pressing needle.

[0065] Optionally, the pressing needle is an elastic pressing needle, which elastically presses the welding strip on the grid line of the corresponding battery sheet to prevent the pressing needle from damaging the battery sheet.

[0066] S103, electrify the welding strip to make the welding strip heat and then be welded on the grid line of the corresponding battery sheet.

[0067] Compared with the traditional battery string welding method, the battery string welding method in this embodiment ensures the uniformity of the temperature of the welding strip, thereby improving the welding quality between the welding strip and the grid line on the corresponding battery sheet, and preventing virtual welding points from occurring.

[0068] The electrification of the welding strip in step S103 can be selected from the following three ways.

[0069] The first end of the solder strip is electrically connected to the first electrode of the power source, and the second end of the solder strip is electrically connected to the second electrode of the power source.

[0070] The power supply mode only needs to use one power supply loop to realize the overall power supply of the solder strip, so as to weld the solder strip to the battery piece.

[0071] The head solder strip and the tail solder strip are also suitable for this power supply welding mode.

[0072] The second power supply mode: the first end of the solder strip is electrically connected to the first electrode of the power source, the middle part of the solder strip is electrically connected to the second electrode of the power source, and the second end of the solder strip is electrically connected to the first electrode of the power source.

[0073] The third power supply mode: the first end of the front half of the solder strip is electrically connected to the first electrode of the power source, the second end of the front half of the solder strip is electrically connected to the second electrode of the power source, and the first end of the rear half of the solder strip is electrically connected to the second electrode of the power source. The second end of the rear half of the solder strip is electrically connected to the first electrode of the power source. That is, the two conductive points in the middle of the solder strip are connected to the electrodes with the same polarity, and the two ends of the solder strip are connected to the electrodes with opposite polarity.

[0074] The second power supply mode and the third power supply mode realize the local power supply of the front half and the rear half of the solder strip, so as to weld the front half and the rear half of the solder strip to the front surface of the front battery piece and the back surface of the rear battery piece, respectively, and further improve the welding quality between the second end of the front half of the solder strip, the first end of the rear half of the solder strip and the grid line.

[0075] In the above power supply modes, the polarity of the first electrode and the second electrode is opposite, for example, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0076] Second embodiment

[0077] In this embodiment, the battery piece is provided with a grid line, and the solder strip needs to be welded on only one side of the battery piece. The battery string welding method of this embodiment is used to weld the battery pieces into a string (IBC battery string).

[0078] The battery string welding method of this embodiment is basically the same as the welding step of the battery string welding method in the first embodiment. In order to describe the solution, only the difference between this embodiment and the first embodiment is described here.

[0079] In this embodiment, as shown in Figure 3 The stacking rule of the solder strip and the battery piece in step S101 is:

[0080] In addition to the head solder strip 302 and the tail solder strip 303, the front half of the solder strip 301 is stacked on the front surface of the front battery piece 401 in the two adjacent battery pieces, and the rear half of the solder strip 301 is stacked on the front surface of the rear battery piece 402 in the two adjacent battery pieces.

[0081] The head solder strip 302 is stacked on the head battery piece and extends outwardly from the head battery piece, and the tail solder strip 303 is stacked on the tail battery piece and extends outwardly from the tail battery piece.

[0082] It should be noted that the front surface of the battery piece mentioned here refers to the surface facing upward after the battery piece is stacked.

[0083] In this embodiment, the power supply to the solder strip in step S103 is specifically as follows:

[0084] The two ends of the solder strip are electrically connected to the first electrode and the second electrode of the power supply, respectively. That is, by supplying power to the entire solder strip, the solder strip is welded to the grid line of the corresponding battery piece.

[0085] The polarity of the first electrode and the second electrode is opposite, for example, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0086] Third embodiment

[0087] In this embodiment, the battery piece is provided with a pad point, and the front surface and the back surface of the battery piece need to be welded with a solder strip. The battery string welding method of this embodiment is used to weld the battery pieces into a string, which includes the following steps:

[0088] S201, stack the solder strip and the battery piece according to a predetermined rule, and make each solder strip cover the pad point on the corresponding battery piece.

[0089] As shown in Figure 1 and Figure 2 In addition to the head solder strip 302 and the tail solder strip 303, the stacking rule of the solder strip 301 and the battery piece in this embodiment is that the front half of the solder strip 301 is stacked on the front surface of the front battery piece 401 in the two adjacent battery pieces, and the back surface of the rear battery piece 402 in the two adjacent battery pieces is stacked on the rear half of the solder strip.

[0090] The back surface of the head battery piece 302 is stacked on the rear half of the head solder strip, and the front half of the tail solder strip 303 is stacked on the front surface of the tail battery piece.

[0091] S202, power is supplied to the solder strip so that the solder strip is welded to the pad point on the corresponding battery piece after heating.

[0092] Optionally, in order to further improve the welding quality of the solder strip and the pad point and prevent virtual welding, the solder strip can be pressed against the corresponding pad point when power is supplied to the solder strip.

[0093] The four modes can be selected for the power supply to the solder strip in step S202.

[0094] The first mode: the first end of the solder strip is electrically connected to the first electrode of the power supply, and the second end of the solder strip is electrically connected to the second electrode of the power supply.

[0095] This mode only needs to use one power supply circuit to realize the power supply to the whole solder strip, thereby welding the solder strip to the battery sheet.

[0096] The head solder strip and the tail solder strip are also suitable for this power supply and welding mode.

[0097] The second mode: the first end of the solder strip is electrically connected to the first electrode of the power supply, the middle part of the solder strip is electrically connected to the second electrode of the power supply, and the second end of the solder strip is electrically connected to the first electrode of the power supply.

[0098] The third mode: the first end of the front half of the solder strip is electrically connected to the first electrode of the power supply, the second end of the front half of the solder strip is electrically connected to the second electrode of the power supply, the first end of the rear half of the solder strip is electrically connected to the second electrode of the power supply, and the second end of the rear half of the solder strip is electrically connected to the first electrode of the power supply. That is, the two conductive points in the middle of the solder strip are connected to the electrodes with the same polarity, and the two ends of the solder strip are connected to the electrodes with opposite polarity.

[0099] The second mode and the third mode realize the power supply to the front half and the rear half of the solder strip to weld the front half and the rear half of the solder strip to the front surface of the front battery sheet and the back surface of the rear battery sheet, respectively, and further improve the welding quality between the second end of the front half of the solder strip, the first end of the rear half of the solder strip and the grid line.

[0100] The fourth mode: the first electrode needle connected to the first electrode of the power supply and the second electrode needle connected to the second electrode of the power supply are used to implement the power supply to the solder strip on the pad point from both sides of the pad point.

[0101] The fourth mode realizes the power supply to the solder strip on the pad point, realizes the spot welding of the solder strip and the corresponding pad point, and further improves the welding quality between the solder strip and the pad point.

[0102] In the above modes, the polarity of the first electrode and the second electrode is opposite, for example, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0103] Fourth embodiment

[0104] The battery piece in the embodiment is provided with a pad point, and the battery piece needs to be welded with a welding strip on one side. The battery string welding method of the embodiment is used for welding the battery pieces into a string (an IBC battery string).

[0105] The welding step of the battery string welding method of the embodiment is basically the same as that of the battery string welding method in the third embodiment, and for the purpose of description, only the difference between the embodiment and the first embodiment is described.

[0106] In the embodiment, as shown in Figure 3 The stacking rule of the welding strip and the battery piece in step S201 is as follows:

[0107] The front half of the welding strip 301 is stacked on the front surface of the front battery piece 401 in the two adjacent battery pieces, and the rear half of the welding strip is stacked on the front surface of the rear battery piece 402 in the two adjacent battery pieces.

[0108] The head welding strip 302 is stacked on the head battery piece and extends outwardly from the head battery piece, and the tail welding strip 303 is stacked on the tail battery piece and extends outwardly from the tail battery piece.

[0109] It should be noted that the front surface of the battery piece mentioned here refers to the surface upward after the battery piece is stacked.

[0110] In the embodiment, the power supply to the welding strip in step S202 can be achieved in the following two ways:

[0111] The first power supply mode: the two ends of the welding strip are respectively electrically connected to the first electrode and the second electrode of the power supply.

[0112] That is, the welding strip is welded to the pad point of the corresponding battery piece by power supply to the whole welding strip.

[0113] The second power supply mode: the first electrode needle connected to the first electrode of the power supply and the second electrode needle connected to the second electrode of the power supply are used to supply power to the welding strip covering the pad point from both sides of the pad point.

[0114] This power supply mode realizes the local power supply to the welding strip on the pad point, realizes the spot welding of the welding strip and the corresponding pad points, and further improves the welding quality between the welding strip and the pad points.

[0115] The application also provides a battery string welding device, as shown in Figure 4 The battery string welding device comprises a pair of first electrode needles 1 and second electrode needles 2, wherein:

[0116] The first electrode needle 1 is connected to the first electrode of the power supply, and the second electrode needle 2 is connected to the second electrode of the power supply. The first and second electrode needles are configured to energize the solder strip to weld the solder strip onto the corresponding solar cell to form a battery string. The first and second electrodes have opposite polarities; for example, the first electrode is the positive electrode, and the second electrode is the negative electrode.

[0117] By pressing the solder strip onto the first electrode needle and the second electrode needle from two positions, the solder strip between the first electrode needle and the second electrode needle is energized, thereby welding the solder strip between the first electrode needle and the second electrode needle to the gate line or pad at the corresponding position.

[0118] For example, the first electrode needle and the second electrode needle press the solder strip onto both sides of the solder pad, which can realize local energization of the solder strip on the solder pad, thereby realizing the fixed-point welding of the solder strip to each corresponding solder pad.

[0119] Continue to refer to Figure 4 As shown, to improve welding efficiency, the optional battery string welding device includes multiple pairs (such as...) Figure 4 The system consists of five pairs of first electrode pins 1 and second electrode pins 2. Multiple pairs of first electrode pins 1 and second electrode pins 2 are arranged in a straight line along the extension direction of the solder strip. Each pair of first electrode pins 1 and second electrode pins 2 is used to energize and solder the solder strip covering the corresponding solder pad from both sides of a solder pad. Furthermore, it must be ensured that the polarity of the electrode pins between two adjacent solder pads is the same.

[0120] Optional, such as Figure 5 As shown, the battery string welding device of the present invention also includes a pressing pin 3 disposed between the first electrode pin 1 and the second electrode pin 2. The pressing pin 3 is used to press the welding strip tightly onto the solder pad, thereby further improving the welding quality between the welding strip and the solder pad.

[0121] The present invention also provides a string welding machine, which includes a cell feeding device, a welding strip feeding device, a welding conveying device, and the battery string welding device provided in any of the above embodiments, wherein: the welding strip feeding device and the cell feeding device are used to stack the welding strip and the cell on the welding conveying device according to a predetermined rule, and to ensure that each welding strip covers the corresponding pad on the cell; the welding conveying device is used to convey the stacked welding strip and the cell to the welding station; the battery string welding device is used to energize the welding strip to weld the welding strip and the cell into a battery string.

[0122] The foregoing has been a sufficient description of the invention to enable one of ordinary skill in the art to make and use the invention. It is understood that the description of the embodiments is merely exemplary and that all changes that do not depart from the true spirit and scope of the invention are intended to be included within the scope of the invention. The scope of the invention is defined by the claims set forth below rather than the description of the embodiments set forth above.

Claims

1. A method for welding battery strings, characterized in that, A method for welding battery cells into strings, wherein the battery cells have solder pads, and the battery string welding method includes: The solder ribbons and solar cells are stacked according to a predetermined rule, so that each solder ribbon covers the corresponding pad on the solar cell. The solder ribbon is energized, causing it to heat up and then solder onto the corresponding pad of the battery cell. The stacking of the solder ribbon and the battery cell according to a predetermined rule includes: stacking the front half of the solder ribbon on the front side of the battery cell in two adjacent battery cells, and stacking the back side of the battery cell in two adjacent battery cells on the back half of the solder ribbon. The energization of the welding strip includes: A first electrode pin connected to the first electrode of the power supply and a second electrode pin connected to the second electrode of the power supply are used to apply local current to the solder strip covering the solder pad from both sides of the solder pad. The first electrode and the second electrode have opposite polarities; Alternatively, the stacking of the solder ribbon and the battery cell according to a predetermined rule includes: stacking the front half of the solder ribbon on the front of the battery cell in two adjacent battery cells, and stacking the rear half of the solder ribbon on the front of the battery cell in two adjacent battery cells. The energization of the welding strip includes: A first electrode pin connected to the first electrode of the power supply and a second electrode pin connected to the second electrode of the power supply are used to apply current to the solder strip covering the solder pad from both sides of the solder pad. The first electrode and the second electrode have opposite polarities.

2. The battery string welding method as described in claim 1, characterized in that, When the welding strip is energized, the battery string welding method further includes pressing the welding strip against the corresponding welding pad.

3. A battery string welding device, characterized in that, The battery string welding device includes multiple pairs of first electrode needles and second electrode needles arranged in a straight line along the extension direction of the welding strip, wherein: The first electrode needle is connected to the first electrode of the power supply, and the second electrode needle is connected to the second electrode of the power supply. The first electrode needle and the second electrode needle are configured to energize the solder strip. There are multiple pairs of first electrode needles and second electrode needles. Each pair of first electrode needles and second electrode needles is used to energize the solder strip covering the solder pad from both sides of a solder pad on the cell to solder the solder strip to the corresponding cell to form a cell string. The first electrode and the second electrode have opposite polarities.

4. The battery string welding apparatus as described in claim 3, characterized in that, The battery string welding device also includes a pressure pin disposed between the first electrode pin and the second electrode pin, the pressure pin being used to press the solder strip onto the solder pad.

5. A string welding machine, characterized in that, The string welding machine includes a cell feeding device, a welding strip feeding device, a welding conveying device, and a battery string welding device as described in any one of claims 3 to 4, wherein: The welding strip feeding device and the battery cell feeding device are used to stack the welding strip and battery cell on the welding conveying device according to a predetermined rule, and to make each welding strip cover the corresponding pad on the battery cell. The welding conveyor is used to transport the stacked welding strips and battery cells to the welding station; The battery string welding device is used to energize the welding strip to weld the welding strip and battery cells into a battery string.

Images