Processing method of battery string

Abstract

The embodiment of the invention provides a processing method of a battery string, and relates to the technical field of photovoltaic modules. The processing method comprises the following steps: arranging a plurality of battery pieces at intervals along a first direction; a welding strip is placed between the two adjacent battery pieces, one end of the welding strip is flatly laid on the front face of one battery piece, and the other end of the welding strip is flatly laid on the back face of the other battery piece; and pressing an adhesive tape on the welding strip, and enabling the two sides of the adhesive tape to be attached to the battery piece. According to the invention, the welding strip is flatly laid on the battery piece for electric conduction; an adhesive tape covers the welding strip and is attached to the battery pieces, so that the welding strip can be tightly connected with the battery pieces, and a plurality of battery pieces are connected in series through the welding strip to form a battery string. The bonding area of the adhesive tape and the battery piece is larger, and the adhesive tape transmits the pressing force to the welding strip, so that the bonding force between the welding strip and the battery piece is stronger; according to the processing method, dispensing is not needed, the process steps are simplified, and the production efficiency can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of photovoltaic modules, and specifically relates to a method for processing a battery string. Background Art

[0002] The processing of battery strings is generally achieved by welding welding ribbons to the main grid lines of multiple battery cells. However, the newly developed busbar-free battery cell technology directly eliminates the main grid lines on the surface of the battery cell to save the silver paste consumption of the battery cell and reduce the silver paste cost. This makes it impossible to connect the battery cells in series to form a battery string by welding welding ribbons to the main grid lines.

[0003] In the prior art, in order to realize the serial connection of busbar-free cells, a glue point (such as UV glue) is applied through a glue dispensing process, and the entire solder strip is glued and solidified on the cell using a UV lamp, and then the solder strip and the cell are alloyed through lamination. However, due to the small number of glue dispensing points, the bonding force between the solder strip and the cell is insufficient; in addition, the steps of the glue dispensing process are relatively cumbersome, which is not conducive to improving production efficiency. Summary of the invention

[0004] The present application aims to provide a battery string processing method to solve the problems of insufficient bonding force between the welding strip and the battery cell in the existing busbar-free battery cell interconnection string process, and the complicated steps that are not conducive to improving production efficiency.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The present application discloses a battery string processing method, the battery string processing method comprising:

[0007] Arrange a plurality of battery cells at intervals along a first direction;

[0008] Placing a soldering ribbon between two adjacent battery cells, wherein one end of the soldering ribbon is laid flat on the front surface of one of the battery cells, and the other end of the soldering ribbon is laid flat on the back surface of the other battery cell;

[0009] Pressing the adhesive tape onto the welding tape, and making the adhesive tape adhere to the battery cell at both sides along the second direction;

[0010] The first direction is perpendicular to the extension direction of the thin grid lines of the battery cell, and the second direction is consistent with the extension direction of the thin grid lines of the battery cell.

[0011] Optionally, the step of arranging the plurality of battery cells at intervals along the first direction comprises:

[0012] Providing a plurality of the battery cells, and making the front and back faces of the plurality of battery cells face the same direction;

[0013] A plurality of battery sheets with the same orientation are arranged at intervals along the first direction.

[0014] Optionally, the step of placing the solder ribbon between two adjacent battery cells, wherein one end of the solder ribbon is laid flat on the front surface of one of the battery cells and the other end of the solder ribbon is laid flat on the back surface of the other battery cell, comprises:

[0015] The welding ribbon is straightened along the first direction, one end of the welding ribbon is laid flat on the front side of the previous battery cell, and the other end of the welding ribbon is laid flat on the back side of the next battery cell, so that the welding ribbon connects two adjacent battery cells.

[0016] Optionally, the soldering tape is a tin-coated copper tape.

[0017] Optionally, the width of the welding strip along the second direction is 0.2 mm-0.3 mm.

[0018] Optionally, the length of the welding strip along the first direction is consistent with the total length of two adjacent battery cells along the first direction.

[0019] Optionally, the step of pressing the adhesive tape onto the welding tape and making the adhesive tape adhere to the battery cell at both sides along the second direction includes:

[0020] The tape is stretched along the first direction to the same length as the battery cell, with the adhesive surface of the tape facing the battery cell, and the tape is pressed onto the soldering tape so that the tape covers the soldering tape in the middle along the second direction, and the tape is adhered to the battery cell on both sides along the second direction.

[0021] Optionally, the adhesive tape includes at least one adhesive surface.

[0022] Optionally, the adhesive tape is a narrow strip structure, and the width of the adhesive tape along the second direction is 5 mm-15 mm.

[0023] Optionally, the adhesive tape is a colorless transparent adhesive tape, and the heat-resistant temperature of the adhesive tape is greater than or equal to 180°C.

[0024] In the embodiment of the present application, the soldering tape is laid flat on the front and back sides of adjacent battery cells along the first direction, so that the battery cells can be electrically conductive by the soldering tape even without a main grid; the soldering tape is covered with adhesive tape and attached to the battery cells, so that the soldering tape can be tightly connected to the battery cells, and multiple battery cells can be connected in series through the soldering tape to form a battery string. Since the adhesive tape has a larger bonding area with the battery cells, and there is not only the adhesive force of the colloid between the adhesive tape and the soldering tape, but also the pressure force transmitted to the soldering tape by the adhesive tape, the bonding force between the soldering tape and the battery cells is stronger; the soldering tape is connected to the battery cells by the adhesive tape, and there is no need to dispense glue, which simplifies the process steps and helps improve production efficiency.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a flowchart of a method for processing a battery string according to an embodiment of the present application;

[0028] Figure 2 is a cross-sectional view of the battery string described in the embodiment of the present application along the first direction;

[0029] Figure 3 is a cross-sectional view of the battery string described in the embodiment of the present application along the second direction;

[0030] Figure 4 It is a top view of the battery cell described in the embodiment of the present application.

[0031] Reference numerals: 1 - battery cell; 2 - soldering tape; 3 - adhesive tape. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0033] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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 application.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The present application embodiment provides a method for processing a battery string. Figure 1 , shows a flowchart of a method for processing a battery string according to an embodiment of the present application, and the method for processing a battery string may include the following steps:

[0037] Step S1: arranging a plurality of battery cells 1 at intervals along a first direction.

[0038] It should be noted that, in the embodiment of the present application, the first direction is a direction perpendicular to the thin grid lines of the battery cell 1 , and the second direction is consistent with the extending direction of the thin grid lines of the battery cell 1 .

[0039] In an optional embodiment of the present application, the step of arranging a plurality of battery cells 1 at intervals along the first direction may specifically include the following sub-steps:

[0040] Sub-step S101: providing a plurality of battery cells 1, and making the front and back faces of the plurality of battery cells 1 face the same direction;

[0041] In an embodiment of the present application, a plurality of battery cells 1 are first prepared, and the plurality of battery cells 1 are of the same specifications and models. The plurality of battery cells 1 of the same specifications and models are placed on a workbench, and the plurality of battery cells 1 are made to face front side upward or back side upward. In this step, the front side and back side of the plurality of battery cells 1 need to be kept in the same direction, and the present application does not make any specific restriction on which side of the battery cell 1 faces upward.

[0042] Sub-step S102: arranging a plurality of battery cells 1 with the same orientation at intervals along a first direction.

[0043] In the embodiment of the present application, the first battery cell 1 is placed first, and the direction perpendicular to the direction of the fine grid lines of the first battery cell 1 is determined as the first direction. Other battery cells 1 are placed in sequence behind the first battery cell 1 along the first direction, so that the multiple battery cells 1 are arranged at equal intervals, and the multiple battery cells 1 are aligned on both sides along the second direction.

[0044] In a specific application, the spacing between the multiple battery cells 1 can be designed according to the specification requirements of the battery string, and the embodiment of the present application does not limit the spacing distance between the multiple battery cells 1.

[0045] Step S2: placing the soldering ribbon 2 between two adjacent battery cells 1 , wherein one end of the soldering ribbon 2 is laid flat on the front surface of one of the battery cells 1 , and the other end of the soldering ribbon 2 is laid flat on the back surface of the other battery cell 1 .

[0046] In the embodiment of the present application, the soldering strip 2 is a tin-coated copper strip.

[0047] The main material of the busbar of the battery cell 1 is silver paste. The busbar-free battery cell 1 eliminates the busbar on the surface of the battery cell 1, reducing the silver paste consumption of the battery cell 1. The tin-coated copper strip 2 realizes the function of the original busbar to conduct current, and further reduces the production cost of the battery cell 1.

[0048] In the embodiment of the present application, the width of the welding strip 2 along the second direction is 0.2 mm-0.3 mm.

[0049] In the embodiment of the present application, the connection between the welding strip 2 and the battery cell 1 is achieved through the adhesive force of the adhesive tape 3. When the performance of the adhesive tape 3 is sufficient, a thinner welding strip 2 can be used. The width of the welding strip 2 along the second direction is between 0.2mm and 0.3mm, which will not affect the connection between the welding strip 2 and the battery cell 1. At the same time, since the width of the welding strip 2 along the second direction is small, the number of welding strips 2 can also be increased, thereby shortening the transmission path of the current on the battery cell 1 on the fine grid line, thereby reducing current loss.

[0050] It should be noted that in the embodiment of the present application, there is no restriction on the number of welding strips, and in specific applications, they can be set according to the specific specifications and models of the battery cells.

[0051] In the embodiment of the present application, after a plurality of battery cells 1 are arranged at equal intervals on a workbench, a positioning device is first used to position the welding ribbon 2, and then the welding ribbon 2 is placed so that one end of the welding ribbon 2 is located above one battery cell 1 and the other end of the welding ribbon 2 is located below an adjacent battery cell 1.

[0052] Optionally, the step of placing the solder ribbon 2 between two adjacent battery cells 1, wherein one end of the solder ribbon 2 is laid flat on the front surface of one of the battery cells 1 and the other end of the solder ribbon 2 is laid flat on the back surface of the other battery cell 1, may specifically include the following sub-steps:

[0053] Sub-step S201: straighten the soldering ribbon 2 along a first direction.

[0054] In the embodiment of the present application, on the surface of the battery cell 1, when the welding ribbon 2 is connected to the battery cell 1, the direction of the welding ribbon 2 is perpendicular to the direction of the fine grid lines of the battery cell. The welding ribbon 2 is straightened along the first direction to avoid winding and bending of the welding ribbon 2, and also to facilitate the placement and laying of the welding ribbon 2.

[0055] Sub-step S202 : Lay one end of the soldering ribbon 2 on the front side of the previous battery cell 1 , and lay the other end of the soldering ribbon 2 on the back side of the next battery cell 1 , so that the soldering ribbon 2 connects two adjacent battery cells 1 .

[0056] In the embodiment of the present application, when the welding ribbon 2 is laid flat, in any two adjacent battery cells 1, the front end of the welding ribbon 2 is connected to the front side of the previous battery cell 1, and the rear end of the welding ribbon 2 is connected to the back side of the next battery cell 1. In this way, the same welding ribbon 2 is stepped between adjacent battery cells 1, with one end located on the front side of the battery string and the other end located on the back side of the battery string. Moreover, the extension directions of the multiple welding ribbons 2 connecting the multiple battery cells 1 can remain consistent, so that the welding ribbon 2 can connect the multiple battery cells 1 in sequence into a string.

[0057] Specifically, the length of the welding strip 2 along the first direction is consistent with the total length of two adjacent battery cells 1 along the first direction.

[0058] Step S3: Press the adhesive tape 3 onto the soldering tape 2 , and make the adhesive tape 3 adhere to the battery cell 1 at both sides along the second direction.

[0059] In the embodiment of the present application, the tape 3 is sticky, and the width of the tape 3 is greater than the width of the welding tape 2. The tape 3 is pressed onto the welding tape 2 along the first direction, and the two sides of the tape 3 along the second direction can be attached to the surface of the battery cell 1, thereby realizing the connection between the welding tape 2 and the battery cell 1.

[0060] Optionally, the step of pressing the adhesive tape 3 onto the welding tape 2 and making the adhesive tape 3 adhere to the battery cell 1 on both sides along the second direction may specifically include the following sub-steps:

[0061] Sub-step S301 : stretching the adhesive tape 3 along a first direction to the same length as the battery cell 1 .

[0062] Since the welding tape 2 itself has no stickiness, when the welding tape 2 is spread flat on the surface of the battery cell 1, there is no adhesion between the welding tape 2 and the battery cell 1. If the connection between the welding tape 2 and the battery cell 1 is not tight, it is easy to cause poor conductivity, affecting the collection effect of the fine grid line current of the battery cell 1. When stretching the adhesive tape 3, stretching the adhesive tape 3 along the first direction to the same length as the battery cell 1 is beneficial for the welding tape 2 to be more tightly connected to the battery cell 1 along the length direction of the first direction, especially for the connection between the end of the welding tape 2 and the battery cell 1, so that the welding tape can collect the current generated by the fine grid lines at both ends of the battery cell 1 along the first direction.

[0063] Sub-step S302 : Make the adhesive surface of the adhesive tape 3 face the battery cell 1 , and press the adhesive tape 3 onto the soldering tape 2 .

[0064] The adhesive surface of the tape 3 is adhesive. When the adhesive surface of the tape 3 faces the battery cell 1 and is pressed onto the soldering tape 2, the adhesiveness of the tape 3 enables the tape 3 and the battery cell 1 to be bonded together. Under the action of pressure, the soldering tape 2 is also tightly connected to the battery cell 1 under the pressure transmitted by the tape 3.

[0065] In the embodiment of the present application, one side of the adhesive tape 3 is an adhesive surface, and the adhesive surface is formed by providing an adhesive layer on the main body of the adhesive tape 3 .

[0066] In a specific application, the tape 3 includes at least one adhesive surface. The material of the adhesive layer can be selected according to the size of the welding tape 2 and the tape 3. When used, it must meet the adhesion between the battery cell. The embodiment of the present application does not limit the number of adhesive surfaces of the tape 3 and the material of the adhesive layer.

[0067] In the embodiment of the present application, the adhesive tape 3 is a narrow strip structure, and the width of the adhesive tape 3 along the second direction is 5 mm-15 mm.

[0068] Since the number and size of fine grid lines of different battery cells 1 are different, the selection of welding tape 2 will also be different. When selecting the width of tape 3, it can be determined according to the size of welding tape 2 and the specifications of battery cell 1, which can ensure the adhesion between welding tape 2 and battery cell 1 and meet the requirements of economy and practicality.

[0069] In the embodiment of the present application, the adhesive tape 3 is a colorless transparent adhesive tape 3, and the heat-resistant temperature of the adhesive tape 3 is greater than or equal to 180°C.

[0070] Specifically, when the adhesive tape 3 is used to fix the welding tape 2, the welding tape 2 should be located in the middle of the adhesive tape 3 as much as possible along the second direction. The colorless transparent adhesive tape 3 is conducive to more accurate positioning of the pressing position when the adhesive tape 3 is pressed.

[0071] In addition, since the battery cell 1 is generally affected by light when working, a large amount of heat will be generated on its surface. The tape 3 has a high heat resistance temperature to prevent the tape 3 from overheating and being damaged, affecting the connection between the welding tape 2 and the battery cell 1, resulting in the current collection of the battery string being restricted.

[0072] In summary, the embodiments of the present application lay the soldering tape on the front and back sides of adjacent battery cells along the first direction, so that the battery cells can be electrically conductive by the soldering tape even without a main grid; by covering the soldering tape with the adhesive tape and attaching it to the battery cells, the soldering tape can be tightly connected to the battery cells, and multiple battery cells can be connected in series through the soldering tape to form a battery string. Since the adhesive tape and the battery cells have a larger bonding area, and there is not only the adhesive force of the colloid between the adhesive tape and the soldering tape, but also the compressive force transmitted to the soldering tape by the adhesive tape, the bonding force between the soldering tape and the battery cells is stronger; the soldering tape and the battery cells are connected by the adhesive tape, and there is no need to dispense glue, which simplifies the process steps and helps improve production efficiency.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for processing a battery string, characterized in that: include: Arrange a plurality of battery cells at intervals along a first direction; Placing a soldering ribbon between two adjacent battery cells, wherein one end of the soldering ribbon is laid flat on the front surface of one of the battery cells, and the other end of the soldering ribbon is laid flat on the back surface of the other battery cell; Pressing the adhesive tape onto the welding tape, and making the adhesive tape adhere to the battery cell at both sides along the second direction; The first direction is perpendicular to the extension direction of the thin grid lines of the battery cell, and the second direction is consistent with the extension direction of the thin grid lines of the battery cell.

2. The battery string processing method according to claim 1, characterized in that: The step of arranging a plurality of battery cells at intervals along the first direction comprises: Providing a plurality of the battery cells, and making the front and back faces of the plurality of battery cells face the same direction; A plurality of battery sheets with the same orientation are arranged at intervals along the first direction.

3. The battery string processing method according to claim 1, characterized in that: The step of placing the solder strip between two adjacent battery cells, wherein one end of the solder strip is laid flat on the front side of one of the battery cells and the other end of the solder strip is laid flat on the back side of the other battery cell, comprises: The welding ribbon is straightened along the first direction, one end of the welding ribbon is laid flat on the front side of the previous battery cell, and the other end of the welding ribbon is laid flat on the back side of the next battery cell, so that the welding ribbon connects two adjacent battery cells.

4. The battery string processing method according to claim 1, characterized in that: The welding strip is a tin-coated copper strip.

5. The battery string processing method according to claim 1, characterized in that: The width of the welding strip along the second direction is 0.2 mm-0.3 mm.

6. The battery string processing method according to claim 1, characterized in that: The length of the welding strip along the first direction is consistent with the total length of two adjacent battery cells along the first direction.

7. The battery string processing method according to claim 1, characterized in that: The step of pressing the adhesive tape onto the welding tape and making the adhesive tape adhere to the battery cell on both sides along the second direction includes: The tape is stretched along the first direction to the same length as the battery cell, with the adhesive surface of the tape facing the battery cell, and the tape is pressed onto the soldering tape so that the tape covers the soldering tape in the middle along the second direction, and the tape is adhered to the battery cell on both sides along the second direction.

8. The method for processing a battery string according to claim 7, characterized in that: The adhesive tape comprises at least one adhesive surface.

9. The method for processing a battery string according to claim 1, characterized in that: The adhesive tape is a narrow strip structure, and the width of the adhesive tape along the second direction is 5 mm to 15 mm.

10. The battery string processing method according to claim 1, characterized in that: The adhesive tape is a colorless transparent adhesive tape, and the heat-resistant temperature of the adhesive tape is greater than or equal to 180°C.

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