CN116504872A - Battery string production method and battery module production method - Google Patents

Abstract

The invention provides a battery string production method and a battery assembly production method, comprising the following steps: applying a curing adhesive to at least one welding surface of the battery piece, wherein the welding surface is the back surface of the battery piece, or the welding surface is the front surface and the back surface of the battery piece; arranging the glued battery pieces and welding strips to form a battery string to be welded, wherein the welding strips are stacked on the welding surfaces of the corresponding battery pieces and are positioned on the solidified glue; welding the welding strip onto the welding surface of the corresponding battery piece, so that alloying connection is formed between the welding strip and the welding surface of the corresponding battery piece, and a welded battery string is obtained; the battery strings are cured so that the welding strips are re-fixed to the welding surfaces of the corresponding battery pieces through the cured adhesive. After the welding strip group is welded on the welding surface of the battery piece without the main grid, the welding strip is glued and then fixed on the welding surface through the curing glue coated on the battery piece. Therefore, the connection strength between the welding strip and the auxiliary grid line can be ensured, and the welding strip is prevented from being displaced.

Description

Battery string production method and battery module production method

technical field

The invention relates to the field of battery production, in particular to a battery string production method and a battery component production method.

Background technique

For conventional photovoltaic solar modules, silver is deposited on the surface of photovoltaic solar cells to form conductive grid lines by screen printing, etc., and its mechanical strength is improved by printing busbars and pad points at designated positions. At the same time, the purpose of forming a good electrical contact.

However, the silver paste constituting the busbar forms a certain optical shield on the surface of the battery sheet, resulting in optical loss of the photovoltaic battery sheet. In addition, a large amount of silver paste is used, which increases the cost of photovoltaic modules, which is not conducive to the development of solar photovoltaics.

For this reason, a busbar-free cell has been introduced on the market. The surface of the cell is not provided with a busbar, and is directly connected to the sub-grid on the cell by soldering ribbons to form a battery string. However, the auxiliary grid line is relatively thin, and the connection between the solder ribbon and the battery sheet is unstable.

Contents of the invention

In order to solve the above technical problems, the present invention provides a battery string production method, which adopts the following technical solutions:

A battery string production method, used for connecting battery slices in series to form a battery string, the battery string production method comprising:

Applying curing glue to at least one welding surface of the battery sheet, the welding surface is the back of the battery sheet, or the welding surfaces are the front and back of the battery sheet;

Arrange the glued battery sheets and ribbons according to the predetermined arrangement rules to form a battery string to be welded, wherein the ribbons are stacked on the welding surface of the corresponding battery sheet and located on the cured glue;

Welding the welding ribbon to the welding surface of the corresponding battery sheet, so that an alloyed connection is formed between the welding ribbon and the welding surface of the corresponding battery sheet, and a welded battery string is obtained;

The battery string is cured, so that the cured adhesive of the solder ribbon is fixed to the soldering surface of the corresponding battery sheet.

In the battery string production method of the present invention, after the welding ribbon group is welded to the welding surface of the battery sheet without main grid, the welding ribbon is glued and then fixed on the welding surface through the curing glue coated on the battery sheet. In this way, the connection strength between the welding strip and the auxiliary grid line can be guaranteed, and the displacement of the welding strip can be prevented. The way of welding first also avoids the interference of the colloid solidified in advance to the welding, resulting in weak welding contact.

In some embodiments, the melting temperature of the surface solder on the solder ribbon is lower than the curing temperature of the curing glue.

The melting temperature of the surface solder on the ribbon is lower than the curing temperature of the curing adhesive. Therefore, during the soldering process, when the surface solder on the ribbon melts to form an alloyed connection, the curing adhesive on the cell will not melt.

In some embodiments, the solder on the surface of the solder strip is a low-melting alloy or a low-melting metal, and the melting point of the low-melting alloy or the low-melting metal is 140° C. to 200° C.

By adopting the low-temperature welding strip whose surface layer is low-melting point alloy or metal coating, the welding strip can be welded to the welding surface at low temperature, avoiding over-welding and waste of electric energy caused by excessive temperature.

In some embodiments, applying the curing glue to the welding surface of the battery sheet includes: applying glue and curing glue to the welding surface of the battery sheet by means of inkjet, silk screen printing or glue dispensing.

Several preferred glue application methods are provided, all of which can ensure that the cured glue is applied to the welding surface of the battery sheet.

In some embodiments, after arranging the glued battery sheets and ribbons according to a predetermined string layout rule, the battery string production method further includes: pressing the ribbons onto the corresponding battery sheets by using a pressing tool.

Press the welding ribbon to the corresponding battery sheet by pressing the tooling, which can ensure that the welding ribbon is tightly attached to the auxiliary grid line on the corresponding battery sheet, so as to ensure that after welding, a high-quality alloy is formed between the welding ribbon and the auxiliary grid line connection to prevent false solder joints.

In some embodiments, the pressing tool includes a frame and pressing pins arranged on the frame for pressing the welding ribbon, wherein the frame and/or the pressing pins are light-transmissive.

The frame and/or pressing pin of the pressing tool has a transparent line. When the laser welding device is used for welding, the welding laser emitted by the laser welding device can be smoothly irradiated on the welding strip to improve the welding effect.

In some embodiments, arranging the sized battery sheets and ribbons according to a predetermined arrangement rule includes: arranging the sized battery sheets and ribbons on a welding conveyor belt according to a predetermined arrangement rule;

Solder the ribbon to the welding surface of the corresponding cell, including:

Control the welding conveyor belt to transport the arranged cells and ribbons to the welding station;

Control the welding device at the welding station to weld the ribbon to the welding surface of the corresponding cell;

Curing of battery strings, including:

Control the welding conveyor belt to transport the battery string to the curing station;

The curing device at the curing station is controlled to cure the battery strings.

The welding conveyor belt realizes the arrangement of battery sheets and ribbons into strings, and automatically transports the battery strings to be welded to the welding station and curing station to complete the welding and curing of the battery strings, thereby improving the battery string production efficiency.

In some embodiments, the welding conveyor belt is a light-transmitting conveyor belt; or, the welding conveyor belt includes a first welding conveyor belt, and a second welding conveyor belt located behind the first welding conveyor belt in the same conveying direction as the first conveyor belt. The conveyor belt; the welding station is located on the conveyor path of the first welding conveyor belt; the curing station is located on the conveyor path of the second welding conveyor belt, and the second welding conveyor belt is a transparent conveyor belt.

The welding conveyor belt at the curing station is a light-transmitting conveyor belt. In this way, a curing device can also be installed under the curing station, and the curing device below the curing station can also implement curing of the battery string from below through the conveyor belt. , so as to further improve the curing efficiency.

The welding conveyor belt is configured to include a first welding conveyor belt and a second welding conveyor belt, the battery sheets and the welding ribbons are placed on the first welding conveyor belt, and the battery strings are welded on the first welding conveyor belt. After the welded battery string transitions from the first welding conveyor belt to the second welding conveyor belt, curing is completed on the second welding conveyor belt. In this way, residues such as flux and curing glue remaining on the first welding conveyor belt will not be transported to the curing station synchronously with the welded battery strings.

In some embodiments, the curing glue is light curing glue, and the curing device at least includes a light curing light box arranged above the conveyor belt; or, the curing glue is a heat curing glue, and the curing device at least includes a heat curing light box arranged above the conveyor belt. light box.

In some embodiments, the welding surfaces are the front and back sides of the battery sheet, and the curing glue applied to at least one welding surface of the battery sheet is:

Apply curing glue to the back of the cell;

Before curing the battery strings, the battery string production method further includes:

Apply cured glue to the front side of the battery sheet in the battery string.

The back sizing and front sizing are respectively arranged at the front and back of the welding station, which can avoid interference between the back sizing mechanism and the front sizing mechanism.

The present invention also provides a battery assembly production method, which includes:

Produce a number of battery strings according to any one of the battery string production methods described above;

Lay out several battery strings into a battery assembly;

Weld bus bars to battery components;

Lamination curing of battery assemblies with bus bars welded on them.

According to the battery assembly production method provided by the present invention, the welding strength between the welding ribbon on the battery string and the auxiliary grid line is guaranteed, which can effectively prevent the displacement of the welding ribbon, thereby ensuring the performance of the battery assembly.

Description of drawings

Fig. 1 is a schematic diagram of arranged battery strings in an embodiment of the present invention;

Fig. 2 is a schematic diagram of arranged battery strings in another embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a battery string production device implementing the battery string production method of the present invention in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a battery string production device implementing the battery string production method of the present invention in another embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a battery string production device implementing the battery string production method of the present invention in yet another embodiment of the present invention.

Figures 1 to 5 include:

Welding conveyor belt 1:

The first welding conveyor belt 11, the second welding conveyor belt 12;

Back glue sizing device 2;

Front sizing device 3;

Welding device 4;

Curing device 5.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As described above, there is no main grid line on the surface of the battery sheet without busbar, and it is directly connected to the auxiliary grid line on the battery sheet by using a welding ribbon to form a battery string. However, due to the relatively thin auxiliary grid lines, the connection between the solder ribbon and the battery sheet is unstable.

In order to solve the above technical problems, the present invention provides a method for producing a battery string, which is used to connect busbar-free battery slices (hereinafter referred to as “battery slices”) in series to form a battery string.

As known to those skilled in the art, according to the setting of the welding surface, the battery sheet is divided into two types, wherein: the first type of battery sheet has auxiliary grid lines on both surfaces, that is, both surfaces are welding surfaces ; In the second type of battery sheet, only one surface is provided with auxiliary grid lines, that is, only one surface is a welding surface.

The battery string production method provided by the present invention comprises the following steps:

Apply curing glue to at least one welding surface of the battery sheet, the welding surface is the back of the battery sheet, or the welding surfaces are the front and back of the battery sheet.

Arranging the glued battery sheets and ribbons according to a predetermined arrangement rule to form a battery string to be welded, wherein the ribbons are stacked on the welding surface of the corresponding battery sheet and located on the cured adhesive.

Welding the welding ribbon to the welding surface of the corresponding battery sheet, so that an alloyed connection is formed between the welding ribbon and the welding surface of the corresponding battery sheet, and a welded battery string is obtained.

The battery string is cured, so that the cured adhesive of the solder ribbon is fixed to the soldering surface of the corresponding battery sheet.

In the battery string production method of the present invention, after the welding ribbon group is welded to the welding surface of the battery sheet without main grid, the welding ribbon is glued and then fixed on the welding surface through the curing glue coated on the battery sheet. In this way, the connection strength between the welding strip and the auxiliary grid line can be ensured, and the displacement of the welding strip can be prevented. Applying curing glue to the battery sheets in advance can reduce the movement of the battery strings and reduce the risk of battery string damage compared with the sizing after the series connection.

The implementation process of the present invention will be exemplarily described below through three embodiments according to the types of battery sheets.

first embodiment

The battery sheet in this embodiment is the first type of battery sheet, and its back and front are welding surfaces. The "back" in the present invention refers to the surface of the battery sheet facing downward, and the "front" refers to the surface of the battery sheet facing upward. .

Optionally, the battery string production method in this embodiment is implemented by the battery string production device shown in FIG. 3 . As shown in Figure 3, the battery string production device includes a welding conveyor belt 1, a back gluing mechanism 2, a front gluing mechanism 3, a welding device 4 and a curing device 5, wherein:

The side of the feeding end of the welding conveyor belt 1 is provided with a sizing station, and the back sizing mechanism 2 and the front sizing mechanism 3 are all arranged at the sizing station.

A welding station and a curing station are arranged on the conveying path of the welding conveyor belt 1 .

The welding device 4 is arranged above the welding station, and the curing device 5 is arranged above the curing station.

The specific implementation process of the battery string production method in this embodiment is as follows:

Step 1: Load the battery sheet to the gluing station, and the back gluing mechanism 2 and the front gluing mechanism 3 implement synchronous gluing on the back and front of the battery sheet from below and above respectively.

Optionally, the back gluing mechanism 2 and the front gluing mechanism 3 apply the cured glue to the back and the front of the cell by means of inkjet, silk screen printing or glue dispensing.

Step 2: Arrange the battery sheets and ribbons that have been glued on the welding conveyor belt 1 according to the predetermined string rules to form a battery string to be welded. As shown in Figure 1, the predetermined string arrangement rule in this embodiment is:

The i-th cell is stacked on the upper side of the rear portion of the i-th ribbon group, and the front portion of the i+1th ribbon group is stacked on the front of the i-th cell, where i is greater than 0 any natural number.

Step 3: The welding conveyor belt 1 transports the battery string to be welded to the welding station, and the welding device 4 welds the welding ribbon to the back and front of the corresponding battery sheet, so that the welding ribbon and the back and front of the corresponding battery sheet are formed. Alloying connections to obtain welded battery strings.

Optionally, the battery slices are welded with a low-temperature ribbon. For example, the surface layer of the ribbon is a low-melting alloy or a metal coating, and the melting point of the low-melting alloy or the metal coating is 140° C. to 200° C. In addition, the melting temperature of the surface solder on the ribbon is lower than the curing temperature of the curing adhesive. Therefore, during the soldering process, when the surface solder on the ribbon melts to form an alloyed connection, the curing adhesive on the cell will not solidify.

Optionally, before the welding conveyor belt 1 transports the battery strings to be welded to the welding station, the battery string production method in this embodiment further includes: using a pressing tool to press the welding belt onto the corresponding battery sheet. In this way, it can be ensured that the solder ribbon is closely attached to the sub-grid on the corresponding cell, so as to ensure that a high-quality alloyed connection is formed between the solder ribbon and the sub-grid after welding, and prevent false solder joints from appearing.

Optionally, the pressing tool includes a frame and pressing pins arranged on the frame for pressing the welding ribbon, wherein the frame and/or the pressing pins are light-transmissive. When the laser welding device is used for welding, the welding laser emitted by the laser welding device can smoothly pass through the frame and/or the pressing pin and irradiate onto the welding strip, thereby further improving the welding effect.

Step 4: The welding conveyor belt 1 transports the welded battery strings to the curing station, and the curing device 5 cures the battery strings, so that the cured adhesive of the welding ribbon is fixed to the back and front of the corresponding battery sheet.

The curing glue may be light-curing glue, and correspondingly, the curing device 5 at least includes a light-curing light box arranged above the conveyor belt 1 . The curing glue can also be heat curing glue, and correspondingly, the curing device 5 at least includes a heat curing light box arranged above the conveyor belt 1 .

second embodiment

In this embodiment, the battery sheet is a first-type battery sheet, and its back and front sides are welding surfaces.

Optionally, the battery string production method in this embodiment is implemented by the battery string production device shown in FIG. 4 . As shown in Figure 4, the battery string production device includes a welding conveyor belt 1, a back gluing mechanism 2, a front gluing mechanism 3, a welding device 4 and a curing device 5, wherein:

The side of the feeding end of the welding conveyor belt 1 is provided with a back sizing station, and the back sizing mechanism 2 is arranged at the back sizing station.

The conveying path of the welding conveyor belt 1 is provided with a welding station, a front gluing station and a curing station.

The welding device 4 is arranged above the welding station, the front gluing mechanism 3 is arranged above the front gluing station, and the curing device 5 is arranged above the curing station.

The specific implementation process of the battery string production method in this embodiment is as follows:

Step 1: Load the battery sheet to the back sizing station, and the back sizing mechanism 2 implements sizing on the back of the battery sheet from below.

Optionally, the back glue applying mechanism 2 applies the cured glue to the back and front of the battery sheet by means of inkjet, silk screen printing or glue dispensing.

Step 2: Arrange the battery sheets and ribbons that have been glued on the back side on the welding conveyor line 1 according to the predetermined string rules to form a battery string to be welded.

As shown in Figure 1, the predetermined arrangement rules in this embodiment are: the i-th cell is stacked on the upper side of the rear section of the i-th ribbon group, and the front section of the i+1-th ribbon group Stacked on the front of the i-th cell, i is any natural number greater than 0.

Step 3: The welding conveyor belt 1 transports the battery string to be welded to the welding station, and the welding device 4 welds the welding ribbon to the back and front of the corresponding battery sheet, so that the welding ribbon and the back and front of the corresponding battery sheet are formed. Alloying connections to obtain welded battery strings.

Optionally, the battery slices are welded with a low-temperature ribbon. For example, the surface layer of the ribbon is a low-melting alloy or a metal coating, and the melting point of the low-melting alloy or the metal coating is 140° C. to 200° C. In addition, the melting temperature of the surface solder on the ribbon is lower than the curing temperature of the curing adhesive. Therefore, during the soldering process, when the surface solder on the ribbon melts to form an alloyed connection, the curing adhesive on the cell will not solidify.

Optionally, before the welding conveyor belt 1 transports the battery strings to be welded to the welding station, the battery string production method in this embodiment further includes: using a pressing tool to press the welding belt onto the corresponding battery sheet. In this way, it can be ensured that the solder ribbon is closely attached to the sub-grid on the corresponding cell, so as to ensure that a high-quality alloyed connection is formed between the solder ribbon and the sub-grid after welding, and prevent false solder joints from appearing.

Optionally, the pressing tool includes a frame and pressing pins arranged on the frame for pressing the welding ribbon, wherein the frame and/or the pressing pins are light-transmissive. When the laser welding device is used for welding, the welding laser emitted by the laser welding device can smoothly pass through the frame and/or the pressing pin and irradiate onto the welding strip, thereby further improving the welding effect.

Step 4: The welding conveyor belt 1 transports the welded battery strings to the front gluing station, and the front gluing mechanism 3 implements gluing on the front of the cells in the battery string from above.

Optionally, the front glue application mechanism 3 applies the cured glue to the front surface of the battery sheet by means of inkjet, silk screen printing or glue dispensing.

Step 5: The welding conveyor belt 1 transports the battery strings to the curing station, and the curing device 5 cures the battery strings, so that the cured adhesive of the welding ribbon is then fixed to the back and front of the corresponding battery sheet.

The curing glue may be light-curing glue, and correspondingly, the curing device 5 at least includes a light-curing light box arranged above the conveyor belt 1 . The curing glue can also be heat curing glue, and correspondingly, the curing device 5 at least includes a heat curing light box arranged above the conveyor belt 1 .

third embodiment

In this embodiment, the battery sheet is the second type of battery sheet, and its back side is a welding surface.

Optionally, the battery string production method in this embodiment is implemented by the battery string production device shown in Figure 3 or Figure 4, and the specific process is as follows:

Step 1: Load the battery sheet to the gluing station or the back gluing station, and the back gluing mechanism 2 implements gluing on the back of the battery sheet from below.

Optionally, the back glue applying mechanism 2 applies the cured glue to the back of the battery sheet by means of inkjet, silk screen or glue dispensing.

Step 2: Arrange the battery sheets and ribbons that have been glued on the back side on the welding conveyor line 1 according to the predetermined string rules to form a battery string to be welded.

Predetermined cloth string rule in the present embodiment is:

First lay N+1 welding ribbon groups on the welding conveyor belt 1 .

Then stack N cells on N+1 ribbon groups, specifically, the i-th cell is stacked on the second half of the i-th ribbon group and the first half of the i+1-th ribbon group paragraph, wherein, i is an integer ranging from 1 to N.

Step 3: The welding conveyor belt 1 transports the battery string to be welded to the welding station, and the welding device 4 welds the welding ribbon to the back of the corresponding battery sheet, so that the welding ribbon and the back of the corresponding battery sheet form an alloyed connection, thereby achieving welding Good battery string.

Optionally, the battery slices are welded with a low-temperature ribbon. For example, the surface layer of the ribbon is a low-melting alloy or a metal coating, and the melting point of the low-melting alloy or the metal coating is 140° C. to 200° C. In addition, the melting temperature of the surface solder on the ribbon is lower than the curing temperature of the curing adhesive. Therefore, during the soldering process, when the surface solder on the ribbon melts to form an alloyed connection, the curing adhesive on the cell will not melt.

Optionally, before the welding conveyor belt 1 transports the battery strings to be welded to the welding station, the battery string production method in this embodiment further includes: using a pressing tool to press the welding belt onto the corresponding battery sheet. In this way, it can be ensured that the solder ribbon is closely attached to the sub-grid on the corresponding cell, so as to ensure that a high-quality alloyed connection is formed between the solder ribbon and the sub-grid after welding, and prevent false solder joints from appearing.

Optionally, the pressing tool includes a frame and pressing pins arranged on the frame for pressing the welding ribbon, wherein the frame and/or the pressing pins are light-transmissive. When the laser welding device is used for welding, the welding laser emitted by the laser welding device can smoothly pass through the frame and/or the pressing pin and irradiate the welding strip, thereby further improving the welding effect.

Step 4: The welding conveyor belt 1 transports the battery strings to the curing station, and the curing device 5 cures the battery strings, so that the cured adhesive of the welding ribbons is then fixed to the back of the corresponding battery sheet.

The curing glue may be light-curing glue, and correspondingly, the curing device 5 at least includes a light-curing light box arranged above the conveyor belt 1 . The curing glue can also be heat curing glue, and correspondingly, the curing device 5 at least includes a heat curing light box arranged above the conveyor belt 1 .

Fourth embodiment

In this embodiment, the battery sheet is the second type of battery sheet, and its back side is a welding surface.

Optionally, the battery string production method in this embodiment is implemented by the battery string production device shown in Figure 3, and the specific process is as follows:

Step 1: Load the cells to the gluing station, and the back gluing mechanism 3 implements gluing on the back of the cells from above.

Optionally, the back glue applying mechanism 3 applies the cured glue to the front of the battery sheet by means of inkjet, silk screen or glue dispensing.

Step 2: Arrange the battery sheets and ribbons that have been glued on the back side on the welding conveyor line 1 according to the predetermined string rules to form a battery string to be welded.

As shown in Figure 2, the predetermined string arrangement rule in this embodiment is:

Lay the back of the N battery slices upwards on the welding conveyor belt 1 first.

Next, stack N+1 ribbon groups on N cells, specifically, the second half of the i-th ribbon group is stacked on the front of the i-th cell, and the first half of the i-th ribbon group The segments are stacked on the front of the i-1th cell, where i is any integer greater than 1 and smaller than N+1, and N is the total number of cells in the battery string.

The second half of the first ribbon group (that is, the head ribbon group) is stacked on the back of the first cell, and the first half of the N+1th ribbon group (that is, the tail ribbon group) is stacked on the The back side of the Nth cell.

Step 3: The welding conveyor belt 1 transports the battery string to be welded to the welding station, and the welding device 4 welds the welding ribbon to the back of the corresponding battery sheet, so that the welding ribbon forms an alloyed connection with the front of the corresponding battery sheet, thereby achieving welding Good battery string.

Optionally, the battery slices are welded with a low-temperature ribbon. For example, the surface layer of the ribbon is a low-melting alloy or a metal coating, and the melting point of the low-melting alloy or the metal coating is 140° C. to 200° C. In addition, the melting temperature of the surface solder on the ribbon is lower than the curing temperature of the curing adhesive. Therefore, during the soldering process, when the surface solder on the ribbon melts to form an alloyed connection, the curing adhesive on the cell will not melt.

Optionally, before the welding conveyor belt 1 transports the battery strings to be welded to the welding station, the battery string production method in this embodiment further includes: using a pressing tool to press the welding belt onto the corresponding battery sheet. In this way, it can be ensured that the solder ribbon is closely attached to the sub-grid on the corresponding cell, so as to ensure that a high-quality alloyed connection is formed between the solder ribbon and the sub-grid after welding, and prevent false solder joints from appearing.

Optionally, the pressing tool includes a frame and pressing pins arranged on the frame for pressing the welding ribbon, wherein the frame and/or the pressing pins are light-transmissive. When the laser welding device is used for welding, the welding laser emitted by the laser welding device can smoothly pass through the frame and/or the pressing pin and irradiate onto the welding strip, thereby further improving the welding effect.

Step 4: The welding conveyor belt 1 transports the battery strings to the curing station, and the curing device 5 cures the battery strings, so that the cured adhesive of the welding ribbons is then fixed to the back of the corresponding battery sheet.

Optionally, the battery string production method in this embodiment is implemented by the battery string production device shown in Figure 4, and the specific process is as follows:

Step 1: Arrange the battery sheets and ribbons on the welding conveyor belt 1 according to the predetermined arrangement rules to form battery strings to be welded.

As shown in Figure 2, the predetermined string arrangement rule in this embodiment is:

Lay the back of the N battery slices upwards on the welding conveyor belt 1 first.

Next, stack N+1 ribbon groups on N cells, specifically, the second half of the i-th ribbon group is stacked on the front of the i-th cell, and the first half of the i-th ribbon group The segments are stacked on the back of the i-1th battery slice, where i is any integer greater than 1 and less than N+1, and N is the total number of battery slices in the battery string.

The second half of the first ribbon group (that is, the head ribbon group) is stacked on the back of the first cell, and the first half of the N+1th ribbon group (that is, the tail ribbon group) is stacked on the The back side of the Nth cell.

Step 2: The welding conveyor belt 1 transports the battery string to be welded to the welding station, and the welding device 4 welds the welding ribbon to the back of the corresponding battery sheet, so that an alloyed connection is formed between the welding ribbon and the back of the corresponding battery sheet, Thereby a welded battery string is obtained.

Optionally, the battery slices are welded with a low-temperature ribbon. For example, the surface layer of the ribbon is a low-melting alloy or a metal coating, and the melting point of the low-melting alloy or the metal coating is 140° C. to 200° C. In addition, the melting temperature of the surface solder on the ribbon is lower than the curing temperature of the curing adhesive. Therefore, during the soldering process, when the surface solder on the ribbon melts to form an alloyed connection, the curing adhesive on the cell will not melt.

Optionally, before the welding conveyor belt 1 transports the battery strings to be welded to the welding station, the battery string production method in this embodiment further includes: using a pressing tool to press the welding belt onto the corresponding battery sheet. In this way, it can be ensured that the solder ribbon is closely attached to the sub-grid on the corresponding cell, so as to ensure that a high-quality alloyed connection is formed between the solder ribbon and the sub-grid after welding, and prevent false solder joints from appearing.

Optionally, the pressing tool includes a frame and pressing pins arranged on the frame for pressing the welding ribbon, wherein the frame and/or the pressing pins are light-transmissive. When the laser welding device is used for welding, the welding laser emitted by the laser welding device can smoothly pass through the frame and/or the pressing pin and irradiate onto the welding strip, thereby further improving the welding effect.

Step 3: The welding conveyor belt 1 transports the welded battery strings to the front gluing station, and the front gluing mechanism 3 implements gluing on the front side of the battery pieces in the battery string from above.

Optionally, the front glue application mechanism 3 applies the cured glue to the front surface of the battery sheet by means of inkjet, silk screen printing or glue dispensing.

Step 4: The welding conveyor belt 1 transports the battery strings to the curing station, and the curing device 5 cures the battery strings, so that the cured adhesive of the welding ribbons is then fixed on the front side of the corresponding battery sheet.

The curing glue may be light-curing glue, and correspondingly, the curing device 5 at least includes a light-curing light box arranged above the conveyor belt 1 . The curing glue can also be heat curing glue, and correspondingly, the curing device 5 at least includes a heat curing light box arranged above the conveyor belt 1 .

Optionally, in the above embodiments, the welding conveyor belt 1 is a transparent conveyor belt. The welding conveyor belt 1 is a light-transmitting conveyor belt. In this way, a curing device can also be installed under the curing station. The curing device below the curing station can also implement curing of the battery string from below through the conveyor belt, thereby further improving curing efficiency.

As described in the previous four embodiments, the welding station is located in front of the curing station. During the welding process, residues such as flux and curing glue will remain on the welding conveyor belt 1 and be transported to the curing station synchronously with the battery sheet and the welding belt, which will easily affect the curing.

In order to solve this problem, as shown in FIG. 5, optionally, the welding conveyor belt 1 includes a first welding conveyor belt 11, and a first welding conveyor belt 11 located behind the first welding conveyor belt 11 in the same conveying direction as the first conveyor belt 11. Two welding conveyor belt 12. The welding station is located on the transport path of the first welding conveyor belt 11 , and the curing station is located on the transport path of the second welding conveyor belt 12 .

The battery sheets and the ribbon cloth are placed on the first welding conveyor belt 11, and the battery strings are welded on the first welding conveyor belt 11. After the welded battery strings transition from the first welding conveyor belt 11 to the second welding conveyor belt 12 , curing is completed on the second welding conveyor belt 12 . In this way, residues such as flux and curing glue remaining on the first welding conveyor belt 11 will not be transported to the curing station synchronously with the welded battery strings.

Optionally, the second welding conveyor belt 12 is a transparent conveyor belt. The second welding conveyor belt 12 is a light-transmitting conveyor belt. In this way, a curing device can also be installed below the curing station, and the curing device below the curing station can also implement curing of the battery strings from below through the conveyor belt, thereby Further improve curing efficiency.

The present invention also provides a method for producing a battery assembly, which includes: producing several battery strings according to the battery string production method provided in any of the above-mentioned embodiments; arranging several battery strings into a battery assembly; welding bus bars to the battery assembly; The battery assembly with the bus bars welded is laminated and cured.

According to the battery assembly produced by the battery assembly production method provided by the present invention, the welding strength between the welding ribbon on the battery string and the auxiliary grid line is guaranteed, which can effectively prevent the displacement of the welding ribbon, thereby ensuring the performance of the battery assembly, and The stability and luminous efficiency of battery components are improved.

The foregoing has described the invention in sufficient detail with some particularity. Those skilled in the art should understand that the descriptions in the embodiments are only exemplary, and all changes made without departing from the true spirit and scope of the present invention should fall within the protection scope of the present invention. The protection scope of the present invention is defined by the claims rather than the above description in the embodiments.

Claims (11)

1. A battery string production method, characterized in that it is used to connect battery slices in series to form a battery string, and the battery string production method comprises: Applying curing glue to at least one welding surface of the battery sheet, the welding surface is the back of the battery sheet, or the welding surfaces are the front and back of the battery sheet; Arrange the glued battery sheets and ribbons according to the predetermined arrangement rules to form a battery string to be welded, wherein the ribbons are stacked on the welding surface of the corresponding battery sheet and located on the cured glue ; Welding the welding ribbon to the welding surface of the corresponding battery sheet, so that an alloyed connection is formed between the welding ribbon and the welding surface of the corresponding battery sheet, and a welded battery string is obtained; The battery string is cured, so that the cured adhesive of the solder ribbon is fixed to the solder surface of the corresponding battery sheet. 2 . The method for producing battery strings according to claim 1 , wherein the melting temperature of the surface layer solder on the solder strip is lower than the curing temperature of the cured glue. 3 . 3. The battery string production method according to claim 1, characterized in that, the surface solder on the solder strip is a low-melting alloy or a low-melting metal, and the melting point of the low-melting alloy or the low-melting metal is 140 ℃～200℃. 4. The battery string production method according to claim 1, wherein said applying curing glue to the welding surface of the battery sheet comprises: Use inkjet, silk screen printing or glue dispensing to sizing and curing glue on the welding surface of the cell. 5. The battery string production method according to claim 1, characterized in that, after arranging the glued battery sheets and welding ribbons according to the predetermined arrangement rules, the battery string production method further comprises: Use a compression tool to compress the solder ribbon to the corresponding battery sheet. 6. The battery string production method according to claim 5, wherein the pressing tooling comprises a frame and pressing pins arranged on the frame for pressing the welding strip, wherein the frame and/or Or the indenter has light transmission. 7. The method for producing battery strings according to claim 1, wherein arranging the glued battery sheets and welding ribbons according to the predetermined string layout rules includes: Arrange the glued cells and ribbons on the welding conveyor belt according to the predetermined layout rules; The welding of the ribbon to the welding surface of the corresponding battery sheet includes: Controlling the welding conveyor belt to transport the arranged battery sheets and welding belts to the welding station; controlling the welding device at the welding station to weld the ribbon to the welding surface of the corresponding battery sheet; The curing of the battery string includes: controlling the welding conveyor belt to transport the battery strings to the curing station; The curing device at the curing station is controlled to cure the battery string. 8. The battery string production method according to claim 7, wherein the welding conveyor belt is a light-transmitting conveyor belt; or The welding conveyor belt includes a first welding conveyor belt, and a second welding conveyor belt located behind the first welding conveyor belt in the same conveying direction as the first conveyor belt; The welding station is located on the conveying path of the first welding conveyor belt; The curing station is located on the conveying path of the second welding conveyor belt, and the second welding conveyor belt is a transparent conveyor belt. 9. The battery string production method according to claim 7, wherein the curing glue is light curing glue, and the curing device at least includes a light curing light box arranged above the conveyor belt; or, the The curing glue is heat curing glue, and the curing device at least includes a heat curing light box arranged above the conveyor belt. 10. The battery string production method according to claim 1, wherein the welding surfaces are the front and back sides of the battery sheet, and the application of curing glue to at least one welding surface of the battery sheet is as follows: Apply curing glue to the back of the cell; Before the curing of the battery string, the battery string production method further includes: Sizing and curing glue on the front side of the battery sheet in the battery string. 11. A battery assembly production method, characterized in that the battery assembly production method comprises: Produce several battery strings by the battery string production method described in any one of claims 1 to 10; arranging several of the battery strings into a battery assembly; Welding bus bars to the battery pack; Lamination curing is performed on the battery assembly welded with the bus bar.