CN117810299A - Battery string repairing method, battery string and photovoltaic module - Google Patents

Abstract

The application relates to a battery string repairing method, a battery string and a photovoltaic module. The battery string repairing method comprises the following steps: shearing: cutting off metal connecting pieces between the defective battery piece and the normal battery piece adjacent to the defective battery piece respectively, so that a space is reserved between the metal connecting pieces and the edges of the normal battery pieces where the metal connecting pieces are positioned; debonding: heating the glue point connected with the metal connecting piece at the cutting position; and (3) removing: removing the bad battery piece and; and (3) reconnecting: and reconnecting the metal connecting pieces cut off from the adjacent normal battery pieces and making ohmic contact with the normal battery pieces. The metal connecting piece between the bad battery piece and the normal battery piece is cut off so as to avoid adding new bad battery pieces, glue on the metal connecting piece can be released by heating glue points, the fracture of the metal connecting piece is not adhered by glue points, the bad battery pieces are removed, and the influence of the bad battery pieces on the normal battery pieces in the debonding process is reduced.

Description

Battery string repairing method, battery string and photovoltaic module

Technical Field

The application relates to the technical field of photovoltaics, in particular to a battery string repairing method, a battery string and a photovoltaic module.

Background

The cell string of a photovoltaic module typically includes a plurality of spaced apart ordered cells and a metal connector connecting the plurality of cells in series. In the use process, bad battery pieces appear in the battery strings, and the battery strings need to be repaired. Then, because the number of the metal connecting pieces is large, the diameter is small, and the metal connecting pieces are fixed with the battery pieces through glue points, the normal battery pieces are easy to damage in the process of dismantling the bad battery pieces, new bad battery pieces are added, the repair difficulty is large, and the repair efficiency is lower.

Disclosure of Invention

Based on the above, it is necessary to provide a battery string repair method for the problems of easy damage to the normal battery sheet during the process of removing the defective battery sheet, addition of new defects, great repair difficulty and low repair efficiency.

In a first aspect, a battery string repair method includes the steps of:

shearing: cutting off metal connecting pieces between the defective battery piece and the normal battery piece adjacent to the defective battery piece respectively, so that a space is reserved between the metal connecting pieces and the edges of the normal battery pieces where the metal connecting pieces are positioned;

debonding: heating the glue point connected with the metal connecting piece at the cutting position;

and (3) removing: removing the bad battery piece and;

and (3) reconnecting: and reconnecting the metal connecting pieces cut off from the adjacent normal battery pieces and making ohmic contact with the normal battery pieces.

In one embodiment, in the step of shearing, one of the cut metal connectors protrudes beyond the edge of the normal cell where it is located, and the other metal connector extends in a direction away from the edge of the normal cell where it is located.

In one embodiment, a distance D1 between one of the metal connectors protruding from the edge of the normal cell where the metal connector is located is 3mm to 15mm, and/or a distance D2 between the other metal connector extending away from the edge of the normal cell where the metal connector is located is 3mm to 15mm.

In one embodiment, the step of multiplexing includes: and welding the cut metal connectors on the adjacent normal battery pieces and making ohmic contact with the normal battery pieces, and/or bonding the cut metal connectors on the adjacent normal battery pieces and making ohmic contact with the normal battery pieces.

In one embodiment, when the metal connecting pieces cut off on the adjacent normal battery pieces are welded, the welding temperature is 200-250 ℃, and/or the welding time is 1-3 s.

In one embodiment, the step of multiplexing includes: and after welding the metal connecting pieces cut off on the adjacent normal battery pieces and making ohmic contact with the normal battery pieces, covering a glue film on the welding position and solidifying the glue film.

In one embodiment, the metal connecting pieces cut off by the adjacent normal battery pieces are welded after being at least partially overlapped along the thickness direction of the metal connecting pieces.

In one embodiment, the overlapping distance is 1mm to 5mm.

In one embodiment, the mass of the adhesive film is 80 g-160 g;

and/or the width of the adhesive film is 5 mm-20 mm;

and/or the crosslinking degree of the adhesive film is 40% -60%;

and/or, the curing temperature is 80-120 ℃;

and/or, the curing is one of photo-curing and thermosetting.

In one embodiment, in the debonding step, the heating temperature is 90 ℃ to 150 ℃ and/or the heating time is 1s to 10s.

In a second aspect, a battery string is prepared by the battery string repair method according to the first aspect.

In a third aspect, a photovoltaic module includes a battery string, where the battery string is prepared by the method for repairing a battery string according to the first aspect.

According to the battery string repairing method, the metal connecting piece between the bad battery piece and the normal battery piece is cut through the cutting step, so that the metal connecting piece on the bad battery piece is prevented from being pulled by the metal connecting piece on the normal battery piece, and after the cutting, the metal connecting piece and the edge of the normal battery piece where the metal connecting piece is located have a distance, so that a connecting site is provided for subsequent reconnection. The adhesive points connected with the metal connecting piece at the cutting positions are heated, so that the viscosity of the adhesive points is reduced, and defective battery pieces are removed more favorably. After the bad battery pieces are separated, the metal connecting pieces on the normal battery pieces on two sides are connected again and then in ohmic contact with the normal battery pieces, so that current conduction is realized, and the repair of the battery string is completed.

Drawings

Fig. 1 is a flowchart of a battery string repair method according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a battery string in a battery string repair method according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of the embodiment of the present application after defective battery pieces are removed.

Fig. 4 is a schematic structural diagram of a normal battery cell after reconnection in the embodiment of the present application.

Reference numerals illustrate: 100. a battery string; 1. poor battery pieces; 2. normal cell sheets; 3. a metal connector; 4. an adhesive film; 5. a heating member; 6. and a cutting position.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

The photovoltaic module consists of a certain number of battery pieces, and the battery pieces are the most basic power generation units of the photovoltaic module. An important way of reducing cost and enhancing efficiency of the photovoltaic module is to reduce silver consumption, and at present, a plurality of metal connecting pieces with smaller diameters are additionally arranged on the surface of a battery piece to replace a main grid and are connected with a fine grid to realize current conduction, so that the silver consumption is reduced. In order to form sufficient adhesion between the metal connecting piece with a smaller diameter and the surface of the battery piece and reduce grid detachment, glue points are generally used for connecting the metal connecting piece and the battery piece. When the defective battery piece of the battery string needs to be repaired, the defective battery piece needs to be debonded so as to be removed. Because the distribution of metal connecting piece is intensive and the adhesion is firm, be difficult to control when mechanical application of force releases glue bonding, very easily influence its normal battery piece in every side, can make normal battery piece appear damaging in pulling the separation, on the one hand the metal connecting piece atress on the normal battery piece is crooked, on the other hand glue on the normal battery piece receives to pull the destruction and leads to the virtual joint, easily produces new bad. Therefore, there is a need for a battery string repair method that is suitable for repairing a battery string with a smaller diameter and a larger number of metal connectors and a higher connection strength between the metal connectors and the battery pieces, and that does not affect the normal battery pieces themselves and the metal connectors thereon during the process of removing the defective battery pieces.

Referring to fig. 1, according to a first aspect, an embodiment of the present application provides a battery string repair method. The battery string 100 includes a defective battery cell 1 and a normal battery cell 2 connected adjacent thereto. The battery string repairing method comprises the steps of shearing, debonding, removing and reconnecting. Wherein, shearing: the metal connecting pieces 3 between the defective battery piece 1 and the normal battery piece 2 adjacent to the defective battery piece are cut respectively, so that a space is reserved between the metal connecting pieces 3 and the edges of the normal battery pieces 2 where the metal connecting pieces 3 are positioned. Debonding: the glue sites at the cut-off locations 6 are heated in connection with the metal connections 3. And (3) removing: the defective battery piece 1 is removed. And (3) reconnecting: the metal connectors 3 cut off from the adjacent normal cells 2 are reconnected to form ohmic contacts. The method cuts off the metal connecting piece 3 between the bad battery piece 1 and the normal battery piece 2 so as to avoid the metal connecting piece 3 between the bad battery piece 1 and the normal battery piece 2 from being pulled and pulled mutually. The cut-off metal connector 3 has a spacing from the edge of the normal cell 2 where it is located to provide a connection site for reconnection. Although the metal connecting piece 3 is cut off in the cutting step, the two ends after cutting are still adhered to the glue points, and the glue points connected with the metal connecting piece 3 at the cutting position 6 are heated, so that the glue viscosity can be reduced, the two ends of the metal connecting piece after cutting are gradually prevented from being adhered, and defective battery pieces 1 are conveniently removed. After defective battery pieces 1 are removed, the metal connecting pieces 3 cut off from the adjacent normal battery pieces 2 are reconnected and then in ohmic contact with the normal battery pieces 2, so that the repair of the battery string 100 is completed. Through two steps of shearing and heating, the influence of the bad battery piece 1 on the normal battery piece 2 is reduced as much as possible, so that the problems that the metal connecting piece 3 on the normal battery piece 2 is involved and bent, or the virtual connection occurs and the like can be avoided, and new bad occurrence is avoided.

The poor battery piece 1 in the embodiment of the present application indicates a battery piece in which quality problems such as hidden cracks, cold solder joints, poor glue adhesion and the like are found, and the normal battery piece 2 indicates a battery piece in which quality problems do not occur.

The number or arrangement of the defective cells 1 or the normal cells 2 in the battery string 100 is not limited in the present application. For example, the defective battery sheet 1 may be one, two, three, four, or the like, which may be distributed in plural in series, or in plural at intervals. The normal battery cells 2 may be two, three, four, five, etc. The battery string 100 in the embodiment of the present application includes at least one defective battery cell 1 and two normal battery cells 2. The opposite sides of the defective battery sheet 1 may be opposite sides along its own length direction or opposite sides along its own width direction.

Referring to fig. 2, when there are a plurality of continuous defective battery cells 1 in the battery string 100, the metal connectors 3 between the leftmost and rightmost defective battery cells 1 and the normal battery cells 2 in the defective battery string 100 are cut respectively. When there are a plurality of defective battery pieces 1 spaced apart in the battery string 100, the metal connection members 3 between each defective battery piece 1 and the normal battery pieces 2 connected to the opposite sides thereof are cut, respectively.

The embodiments of the present application do not limit the order of the shearing step and the debonding step. The shearing step may be followed by the debonding step. Or firstly performing the debonding step and then performing the shearing step.

Referring to fig. 2 and 3, in some embodiments, one of the metal connectors 3 after cutting protrudes from the edge of the normal cell 2, and the other metal connector 3 extends away from the edge of the normal cell 2. In order to achieve reconnection, the ends of the protruding metal connection members 3 pass through the gap between the two normal battery plates 2 and extend to the normal battery plates 2 which are reconnected with the protruding metal connection members, and further extend to compensate the spacing between the edges of the side metal connection members 3 away from the normal battery plates 2 where the side metal connection members are located so as to be connected with the ends of the metal connection members 3 on the second side. When the end of the protruding metal connecting piece 3 is just contacted with and reconnected with the end of the far away metal connecting piece 3, the condition of hidden cracks after the battery string 100 is subsequently put into use can be greatly reduced, and the conditions of linear hidden cracks, cross hidden cracks, flaky hidden cracks, unfilled corner hidden cracks or broken hidden cracks and the like are reduced.

One metal connecting piece 3 after cutting off protrudes the edge of the normal cell piece 2 where the metal connecting piece is located, and the other metal connecting piece 3 extends towards the direction away from the edge of the normal cell piece 2 where the metal connecting piece 3 is located, so that the stability of connection between the metal connecting piece 3 and the normal cell piece 2 can be improved, the risk of external short circuit is reduced, the layout and design of the cell string 100 are facilitated, and the efficiency and maintainability of the photovoltaic module are improved. Specifically, the mode can increase the connection area and the contact area of the welding spots, improve the contact density and the connection strength between the welding spots and the normal battery piece 2, and enhance the stability and the reliability of connection; in addition, the short circuit of the battery piece can be prevented, and the risk of the short circuit is reduced; in addition, the relative positions of the welding spots and the normal battery pieces 2 can be clearer and controllable, so that the layout and design of the battery string 100 are facilitated, and the connection between the battery pieces on two sides is more uniform and tight; further, the distribution mode can reduce the change and the offset of the transverse welding position, is beneficial to improving the welding accuracy and repeatability, is more convenient and reliable in maintenance work, and improves the repair efficiency of the battery string 100. Furthermore, the device is suitable for battery pieces with various sizes, can meet the requirements of various welding processes and welding quality, and ensures the performance of the normal battery piece 2.

Referring to fig. 2 and 3, in some embodiments, a distance D1 between the metal connecting piece 3 and the edge of the normal battery plate 2 where the metal connecting piece is located is 3mm to 15mm. In some embodiments, the distance D2 that the other metal connector 3 extends away from the edge of the normal cell 2 where it is located is 3mm to 15mm. The metal connection members 3 protrude or are separated by a distance less than 3mm, which makes it difficult to reconnect the metal connection members 3 at both sides, so that the metal connection members 3 are separated after being connected. When the protruding or far distance is larger than 15mm, the protruding length of the end part of the metal connecting piece 3 is too long, so that the welding and gluing efficiency is reduced, and the welding point or the gluing point is invalid. The cold welding occurs in the welding process, heat is concentrated around the welding point, so that the battery piece is overheated, the battery piece is damaged, the glue joint is easy to break, and the glue film 4 is difficult to cover the lap joint position of the metal connecting piece 3. The distance the metal connector 3 protrudes or is distanced from may be any point value within the above range, for example, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 15mm, etc.

Referring to FIG. 2, in some embodiments, the heating temperature is 90-150 ℃ during the debonding step. The sheared normal battery piece 2 is placed on the heating plate 5 for heating, so that the glue point at the fracture is softened, and the separation of the metal connecting piece at the fracture is facilitated. The heating temperature in the range is slightly higher than the melting point of the metal connecting piece 3, so that the glue point can be quickly separated from melting without affecting the metal connecting piece 3. The heating temperature is lower than 90 ℃, and the adhesive point of the adhesion between the metal connecting piece 3 and the battery piece cannot be softened. The heating temperature is higher than 150 ℃, and the metal connecting piece 3 is heated to be molten. Keeping the heating temperature within the above range can ensure the electrical properties of the metal connector 3, while enabling the softening of the glue point to be accelerated. The heating temperature may be any value within the above range, and may be, for example, 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃ or the like.

In some embodiments, in the debonding step, the heating time is 1s to 10s. The heating time is less than 1s, the softening degree of the adhesive point adhered to the metal connecting piece 3 is insufficient, and the poor battery piece 1 is difficult to detach. The heating time is longer than 10s, so that the normal battery piece 2 and the metal connecting piece 3 are easy to deform and crack, and the performance is easy to be reduced.

In the rejecting step of the embodiment of the present application, opposite forces are applied to the normal battery pieces 2 on both sides respectively to separate the normal battery pieces 2 from the defective battery pieces 1, so as to remove the defective battery pieces 1.

The reconnection steps of the embodiments of the present application have the following optional implementation steps: in some embodiments, the severed metal connector 3 on an adjacent normal cell is soldered and in ohmic contact with the normal cell 2. Alternatively, the cut metal connection member 3 on the adjacent normal battery piece is glued and in ohmic contact with the normal battery piece 2. Or referring to fig. 4, after welding the metal connecting piece 3 cut off on the adjacent normal battery piece and making ohmic contact with the normal battery piece 2, covering the adhesive film 4 on the welding position and solidifying the adhesive film 4. In addition, due to the fact that the two fixing modes of welding and cementing are combined at the same time, under the fixing effect of the adhesive film 4, the requirement on welding strength can be reduced, compared with a normal welding process, the welding temperature can be reduced to tens of degrees or even hundreds of degrees, so that repair can be performed at a lower temperature, the welding process can be completed by using less energy and shorter welding time, the method is particularly suitable for solar cells which are sensitive to temperature and affected by temperature changes, such as heterojunction solar cells, and can reduce the influence of temperature on the P-N junction of the cell, reduce structural deformation and material damage of the cell, reduce the risk of cold welding or fragile welding spots, improve the welding quality and be suitable for processing thinner cells.

In some embodiments, the metal connecting pieces cut off by the adjacent normal battery pieces are welded after being at least partially overlapped along the thickness direction of the metal connecting pieces, and the overlapped parts are arranged for welding, so that the welding speed is improved, and the production efficiency is improved. In some embodiments, the overlap distance is 1mm to 5mm. Illustratively, the overlap distance may be any point value within the above range, for example, 1mm, 2mm, 3mm, 4mm, 5mm, and the like.

In some embodiments, the welding temperature is 200 ℃ to 250 ℃ when welding the cut metal connectors 3 on the adjacent normal battery pieces. The welding temperature in the range is lower, so that cold joint caused by overhigh temperature can be avoided, the influence of high temperature on the P-N junction of the battery piece is avoided, the battery piece is prevented from being subjected to excessive thermal stress, the light absorption characteristic is changed, the battery piece is faded or dimmed, the battery piece is shaded, the power generation efficiency is reduced, and the integrity and the reliability of the battery piece are maintained. On the other hand, the welding quality can be improved, the welding position can be accurately controlled, and the welding defects are reduced. Moreover, the welding period can be shortened, the cooling time after welding is reduced, the production speed is increased, the energy consumption is reduced, the energy is saved, and the production cost is reduced. The soldering temperature may be any value within the above range, and may be 200 ℃, 205 ℃, 210 ℃, 215 ℃, 220 ℃, 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, or the like.

In some embodiments, the welding time is 1 s-3 s. The welding speed is lower than 1s, the false welding is easy to cause, and is higher than 3s, the welding speed is too slow, and the metal connecting piece 3 and the battery piece are easy to damage. By way of example, the welding time may be any point within the above range, for example, 1s, 1.5s, 2s, 2.5s, 3s, etc.

The material of the adhesive film 4 in the embodiment of the application comprises one or a combination of more of ethylene-vinyl acetate copolymer, polyvinyl alcohol, silicone adhesive and polyurethane.

In some embodiments, the crosslinking degree of the adhesive film 4 is 40% -60%, and the crosslinking degree of the adhesive film 4 is lower than 40%, so that lamination is difficult; the degree of crosslinking is higher than 60%, the fluidity of the adhesive film 4 is too high, and the adhesive film 4 can flow to the metal connecting piece 3 to influence the current conduction. Illustratively, the crosslinking degree of the adhesive film 4 may be any value within the above range, for example, 40%, 42%, 45%, 47%, 50%, 52%, 55%, 57%, 60%, etc.

In some embodiments, the mass of the adhesive film 4 is 80 g-160 g, the mass of the adhesive film 4 is less than 80g, the adhesive film 4 cannot be laminated in the subsequent steps to compress the metal connecting piece 3, the mass of the adhesive film 4 is more than 160g, and the normal battery piece 2 can be hidden cracked after lamination. Illustratively, the mass of the adhesive film 4 may be any point value within the above-mentioned range, for example 80g, 90g, 100g, 110g, 120g, 130g, 140g, 150g, 160g, etc.

In some embodiments, the width of the adhesive film 4 is 5 mm-20 mm, the width of the adhesive film 4 is less than 5mm, the welding positions of the metal connectors 3 on two sides cannot be covered, so that the welding points are exposed and damaged, the adhesive film 4 is easy to fall off and break, the width of the adhesive film 4 is greater than 20mm, light is blocked from being incident on the surface of the battery piece, the absorption efficiency of the normal battery piece 2 is reduced, and meanwhile, the heat exchange between the normal battery piece 2 and the environment is not facilitated. Illustratively, the width of the adhesive film 4 may be any point value within the above range, for example, may be 5mm, 7mm, 10mm, 13mm, 15mm, 17mm, 20mm, etc.

In some embodiments, the temperature of the cured adhesive film 4 is 80 ℃ to 120 ℃, the curing temperature is controlled within the range, and the curing temperature is larger than the melting point of the adhesive film 4 and smaller than the melting point of the metal connecting piece 3, so that the curing speed and the curing quality can be ensured, and the curing speed and the curing quality can be matched with the welding process of the metal connecting pieces 3 on two sides. Too low or too high a curing temperature may slow or speed up the curing reaction. Temperatures below 80 c may result in slow curing reactions that require longer curing times to cure. A temperature higher than 120 c may cause an excessively fast curing reaction, it is difficult to control the progress of the reaction, and the curing of the adhesive film 4 may be uneven. The reaction is slow at low temperature, the crosslinking reaction is not uniform easily, and the crosslinking degree is insufficient, so that the curing quality is affected. Curing at high temperatures may result in too severe a reaction, resulting in excessive crosslinking, thereby affecting the physical properties and application properties of the adhesive film 4. Too low or too high a temperature may cause difficulties in equipment and processes. Too low a temperature may require longer curing times, increasing the production cycle time. Excessive temperatures may cause the adhesive film 4 to pyrolyze or damage the normal battery plate 2 and the metal connection member 3.

In some embodiments, the curing method of the adhesive film 4 may be photo curing or thermosetting. Photo curing refers to irradiation of the adhesive film 4 with ultraviolet light or visible light to trigger a curing reaction. Thermosetting means that the curing reaction is triggered by raising the temperature of the adhesive film 4, and the welded normal battery plate 2 is placed on the heating plate 5 to be heated, and the heating member 55 covers the welding position. The photo-curing time is short, the reaction speed is high, the curing degree and the curing depth can be accurately controlled by adjusting the irradiation intensity and the time of photo-curing, and the influence on the battery piece and the metal connecting piece 3 is small. The thermosetting application range is wide and is not limited by conditions.

In a second aspect, embodiments of the present application also provide a battery string 100, where the battery string 100 is prepared by a battery string repair method as in the first aspect. The cell string 100 may include copper plated cells, passivation contact solar cells, heterojunction solar cells, back contact solar cells, and the like.

In a third aspect, an embodiment of the present application further provides a photovoltaic module, where the photovoltaic module includes a cell string 100, and the cell string 100 is prepared by a cell string repair method according to the first aspect. The photovoltaic module also comprises a frame, photovoltaic glass and other components. After the adhesive film 4 is covered on the welding position and the adhesive film 4 is cured, the photovoltaic glass is bonded by lamination, and the frame is used for fixing the battery string 100.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (12)

1. The battery string repairing method is characterized by comprising the following steps of:

shearing: cutting off metal connecting pieces between the defective battery piece and the normal battery piece adjacent to the defective battery piece respectively, so that a space is reserved between the metal connecting pieces and the edges of the normal battery pieces where the metal connecting pieces are positioned;

debonding: heating the glue point connected with the metal connecting piece at the cutting position;

and (3) removing: removing the bad battery piece and;

and (3) reconnecting: and reconnecting the metal connecting pieces cut off from the adjacent normal battery pieces and making ohmic contact with the normal battery pieces.

2. The method of repairing a battery string according to claim 1, wherein in the step of cutting, one of the cut metal connecting members protrudes beyond the edge of the normal battery sheet where it is located, and the other metal connecting member extends in a direction away from the edge of the normal battery sheet where it is located.

3. The battery string repair method according to claim 2, wherein a distance D1 of one of the metal connection members protruding from the edge of the normal battery sheet where it is located is 3mm to 15mm, and/or a distance D2 of the other of the metal connection members extending in a direction away from the edge of the normal battery sheet where it is located is 3mm to 15mm.

4. The battery string repair method according to claim 1, wherein the reconnecting step includes: and welding the cut metal connectors on the adjacent normal battery pieces and making ohmic contact with the normal battery pieces, and/or bonding the cut metal connectors on the adjacent normal battery pieces and making ohmic contact with the normal battery pieces.

5. The battery string repair method according to claim 4, wherein when the metal connecting pieces cut off on the adjacent normal battery pieces are welded, the welding temperature is 200 ℃ to 250 ℃ and/or the welding time is 1s to 3s.

6. The battery string repair method according to claim 4, wherein the reconnecting step includes: and after welding the metal connecting pieces cut off on the adjacent normal battery pieces and making ohmic contact with the normal battery pieces, covering a glue film on the welding position and solidifying the glue film.

7. The battery string repair method according to claim 6, wherein the reconnecting step includes: and welding after the metal connecting pieces cut off on the adjacent normal battery pieces are at least partially overlapped along the thickness direction of the metal connecting pieces.

8. The battery string repair method according to claim 7, wherein the overlapping distance is 1mm to 5mm.

9. The battery string repair method according to claim 6, wherein the mass of the adhesive film is 80 g-160 g;

and/or the width of the adhesive film is 5 mm-20 mm;

and/or the crosslinking degree of the adhesive film is 40% -60%;

and/or, the curing temperature is 80-120 ℃;

and/or, the curing is one of photo-curing and thermosetting.

10. The battery string repair method according to any one of claims 1 to 9, wherein in the debonding step, the heating temperature is 90 ℃ to 150 ℃ and/or the heating time is 1s to 10s.

11. A battery string, wherein the battery string is prepared by the battery string repair method according to any one of claims 1 to 10.

12. A photovoltaic module, characterized in that the photovoltaic module comprises a battery string, which is prepared by the battery string repair method according to any one of claims 1 to 10.