String of batteries production line and string of batteries production equipment

Abstract

The present invention discloses a battery string production line and battery string production equipment. The battery string production line includes a solder tape providing device, a cell providing device, a conveying device, and a pre-fixing device. The solder tape providing device places a solder tape group on the conveying device. The cell providing device places cells on the conveying device. The i-th cell is stacked on the second half of the i-th solder tape group, and the first half of the (i + 1)-th solder tape group is stacked on the i-th cell to form a battery string. The pre-fixing device is configured to pre-fix the battery string stacked on the conveying device. The battery string production line further includes at least one of a back film stacking device and a front film stacking device. Among them, the back film stacking device is configured to place a back film so that the back film is stacked on the back of the pre-fixed battery string. The front film stacking device is configured to stack a front film on the front of the pre-fixed battery string. The technical solution provided by the present invention can efficiently connect main-gridless cells in series to form a battery string.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cell self-production, and in particular, to a battery string production line and battery string production equipment. Background Art

[0002] In traditional solar cells, the photo-generated current inside the cell is led to the outside of the cell through the grid lines on it. Considering the final conductivity, silver paste printing is currently mostly used for the grid lines. According to different printing processes, solar cells are divided into three main grid, four main grid, and multi-main grid.

[0003] For the above-mentioned three main grid, four main grid, and multi-main grid solar cells, currently, multiple solder tapes are respectively welded to each main grid line of the solar cell through a flux to obtain a battery string formed by connecting several cells in series, and finally the conversion of light energy into electrical energy is realized. However, the battery string obtained by welding the solder tape to the main grid line not only has a large shading area, which affects the photoelectric conversion efficiency, but also has a high silver paste cost.

[0004] In order to overcome the above problems, main-grid-free crystalline silicon solar cells have emerged. The manufacturing process of connecting main-grid-free cells in series uses upper and lower diaphragms respectively arranged on both sides of a battery string formed by stacking a solder tape and a cell.

[0005] Therefore, there is a need to provide a production device capable of connecting main-grid-free cells in series to form a battery string. Summary of the Invention

[0006] The object of the present invention is to provide a battery string production line and battery string production equipment, which can efficiently connect main-grid-free cells in series to form a battery string.

[0007] To achieve the above object, the battery string production line provided by the present invention includes a solder tape providing device, a cell providing device, a conveying device, and a pre-fixing device; wherein,

[0008] The solder tape providing device is used to place a solder tape group on the conveying device, and each solder tape group includes a plurality of parallel solder tape segments;

[0009] The cell providing device places cells on the conveying device; wherein, the i-th cell is stacked on the second half of the i-th solder tape group, and the first half of the (i + 1)-th solder tape group is stacked on the i-th cell to form a battery string, where i is any natural number greater than 0;

[0010] The pre-fixing device is configured to pre-fix the battery string stacked on the conveying device, so that the stacked cells and solder tape groups are partially or completely fixedly connected together;

[0011] The battery string production line further includes at least one of a back film stacking device and a front film stacking device; wherein,

[0012] The back film stacking device is arranged to place a back film, such that the back film is stacked on the back of the battery string after pre-fixing;

[0013] The front film stacking device is arranged to stack a front film on the front of the battery string after pre-fixing.

[0014] Optionally, the battery string production line includes the back film stacking device, and the back film stacking device includes a back film conveyor and a film tape roll wound with a strip-shaped back film. Wherein, the back film conveyor is arranged at the output end of the conveying device, and a back film conveyor belt running in a direction away from the conveying device is arranged on the back film conveyor;

[0015] The back film released from the film tape roll is laid on the back film conveyor belt from one end of the back film conveyor close to the conveying device and moves along with the back film conveyor belt;

[0016] The battery string on the conveying device is conveyed from the output end of the conveying device to the back film on the back film conveyor after pre-fixing. During the process of the back film conveyor conveying the back film and the battery string, the battery string gradually moves onto the back film, realizing the stacking of the back film on the back of the battery string.

[0017] Optionally, the back film conveyor further includes a bottom plate, the upper part of the back film conveyor belt is supported on the bottom plate, and adsorption holes are arranged on both the back film conveyor belt and the bottom plate. The back film is adsorbed on the back film conveyor belt through the adsorption holes.

[0018] Optionally, the back film conveyor further includes a heating mechanism for heating the bottom plate. By heating the bottom plate through the heating mechanism, the back film is fixed on the battery string.

[0019] Optionally, the solder tape providing device includes a plurality of solder tape rolls, a solder tape pressing mechanism, a solder tape cutting mechanism and a solder tape traction mechanism. The solder tape rolls, the solder tape pressing mechanism, the solder tape cutting mechanism and the solder tape traction mechanism are arranged in sequence along the extension direction of the solder tape. The solder tape traction mechanism traction the solder tape through the solder tape pressing mechanism and the solder tape cutting mechanism to a preset position. When the solder tape pressing mechanism presses the solder tape, the solder tape cutting mechanism cuts the solder tape to form the solder tape group including a plurality of solder tape segments, and the solder tape traction mechanism clamps the cut solder tape group and places it on the conveying device.

[0020] Optionally, the solder tape providing device further includes a solder tape pressing mechanism, which is disposed between the solder tape pressing mechanism and the solder tape cutting mechanism, and is used to press the solder tape group to be cut, so as to form a bending structure at a position between two adjacent solar cells when the solder tape group is stacked with the solar cells.

[0021] Optionally, the battery string production line further includes a solder tape guiding device located at one end of the conveying device close to the solder tape providing device, and the solder tape guiding device guides the solder tape when the solder tape providing device supplies the solder tape to the conveying device.

[0022] Optionally, the conveying device includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to run. The first end of the conveyor belt is arranged to be able to stepwise extend in a direction away from the second end and be able to stepwise return in a direction towards the second end. Wherein, every time the conveyor belt stepwise extends a predetermined length in the direction away from the second end, an empty loading station is formed at the first end of the conveyor belt, and the solar cells and the solder tape group are stacked at the loading station; wherein, the first end is the end of the conveyor belt close to the solder tape providing device, and the second end is the end far from the first end;

[0023] The solder tape guiding device is arranged to move synchronously with the first end of the conveyor belt.

[0024] Optionally, the battery string production line is provided with the front film stacking device, and the front film stacking device is arranged to stack a plurality of the front films on the pre-fixed battery string, wherein the i-th front film is stacked on the first half section of the (i + 1)-th solder tape group.

[0025] Optionally, the battery string production line is provided with the front film stacking device, and the front film stacking device is arranged to stack the strip-shaped front films extending along the length direction of the battery string on the pre-fixed battery string, and the strip-shaped front films extend and are laid on at least two solder tape groups on the battery string.

[0026] Optionally, the battery string production line further includes a secondary hot pressing device, and the secondary hot pressing device hot presses the battery string stacked with the front film and the back film, so that the front film and the back film are hot pressed on the battery string.

[0027] Optionally, the secondary hot pressing device is arranged to hot press the battery string above the battery string, and the battery string stacked with the front film is conveyed to the lower part of the secondary hot pressing device, and the secondary hot pressing device hot presses the battery string.

[0028] Alternatively, the secondary hot pressing device is provided on the front film stacking device. When the front film stacking device releases the front film onto the battery string, the released front film is hot pressed by the secondary hot pressing device.

[0029] Optionally, the battery string production line further includes a string dividing and cutting device, which is configured to divide the entire battery string stacked with the front film and the back film into multiple independent battery strings of a predetermined length.

[0030] According to another aspect of the present invention, there is also provided a battery string production equipment, which includes at least two battery string production lines as described above, and the at least two battery string production lines are arranged in parallel.

[0031] The technical solution provided by the present invention realizes the production process of connecting the main-grid-free battery cells in series by stacking the battery cells and the solder ribbon groups into a battery string in sequence, and then stacking the front film on the front of the battery string or stacking the back film on the back of the battery string, with high production efficiency. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a battery string production line according to an embodiment of the present invention;

[0033] Figures 2 - 6 It is a schematic diagram of stacking the solder ribbon group and the battery cells on the conveying device of the battery string production line according to an embodiment of the present invention;

[0034] Figure 7 It is a schematic diagram of laying the front film on the stacked battery string on the conveying device;

[0035] Figure 8 For Figure 7 The enlarged view at E in

[0036] Figure 9 It is a schematic diagram of pasting the back film on the back of the battery string;

[0037] Figure 10 For Figure 9 The enlarged view at F in

[0038] Figure 11 It is a schematic structural diagram of the conveying device.

[0039] Description of the Reference Numerals

[0040] 1 - Solder tape supply device; 11 - Solder tape reel; 12 - Solder tape pressing device; 13 - Solder tape pressing device; 14 - Solder tape cutting device; 2 - Back film laying device; 21 - Film tape reel wound with strip-shaped back film A; 22 - Back film conveyor; 3 - Conveying device; 31 - Conveyor belt; 32 - Base; 33 - Stepping platform; 34 - Fixed platform; 35 - Conveyor belt drive mechanism; 351 - Driving roller; 352 - First guiding roller; 353 - Second guiding roller; 354 - Tensioning roller; 4 - Hot pressing device; 5 - Solder tape guiding device; 7 - Film tape reel wound with front film D; 8 - String dividing and cutting device. Detailed implementation manners

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted.

[0042] In addition, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be used. In other cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the present disclosure.

[0043] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to another element or feature. It should be understood that, in addition to the orientation shown in the drawings, the spatially relative terms are intended to include different orientations of the device during use or operation. For example, if the device in the drawings is inverted, the element described as being "below" other elements or features will be positioned "above" the other elements or features. Thus, the exemplary term "lower" can include both upper and lower orientations. The device can also be positioned in other ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein can be interpreted accordingly.

[0044] The present invention provides a battery string production line, and the battery string production line includes a solder tape supply device 1, a battery cell supply device, a conveying device 3, and a pre-fixing device 4; wherein,

[0045] The solder ribbon providing device 1 is used to place a solder ribbon group B on the conveying device 3, where each solder ribbon group B includes a plurality of parallel solder ribbon segments;

[0046] The battery string providing device places the battery cells C on the conveying device 3; among them, the i-th battery cell C is stacked on the latter half of the i-th solder ribbon group B, and the first half of the (i + 1)-th solder ribbon group B is stacked on the i-th battery cell C to form a battery string, where i is any natural number greater than 0;

[0047] The pre-fixing device 4 is configured to pre-fix the battery string stacked on the conveying device 3, so that the stacked battery cells C and the solder ribbon group B are partially or fully fixedly connected together, and it is only necessary to prevent the solder ribbon group B from shifting relative to the battery cells C;

[0048] The battery string production line further includes at least one of a back film stacking device 2 and a front film stacking device; among them,

[0049] The back film stacking device 2 is configured to place the back film A, so that the back film A is stacked on the back of the pre-fixed battery string;

[0050] The front film stacking device is configured to stack the front film D on the front of the pre-fixed battery string.

[0051] The technical solution provided by the present invention realizes the production process of connecting the main-grid-free battery cells in series by stacking the front film on the front of the battery string or stacking the back film on the back of the battery string after the battery cells and the solder ribbon group are sequentially stacked into a battery string, and has high production efficiency.

[0052] In a specific embodiment of the present invention, as Figure 1 shown, the solder ribbon providing device 1 includes a plurality of solder ribbon reels 11, a solder ribbon pressing mechanism 12, a solder ribbon cutting mechanism 14, and a solder ribbon traction mechanism ( Figure 1 not shown in the figure). The solder ribbon reels 11, the solder ribbon pressing mechanism 12, the solder ribbon cutting mechanism 14, and the solder ribbon traction mechanism are arranged in sequence along the extending direction of the solder ribbon. The solder ribbon traction mechanism traction the solder ribbon through the solder ribbon pressing mechanism 12 and the solder ribbon cutting mechanism 14 to a preset position. When the solder ribbon pressing mechanism 12 presses the solder ribbon, the solder ribbon cutting mechanism 14 cuts the solder ribbon to form a solder ribbon group B including a plurality of solder ribbon segments, and the solder ribbon traction mechanism clamps the cut solder ribbon group B and places it on the conveying device 3.

[0053] Of course, it can be understood that the solder ribbon providing device 1 can also be a device that directly provides the solder ribbon group.

[0054] Optionally, the solder strip providing device 1 also includes a solder strip pressing mechanism 13, which is arranged between the solder strip clamping mechanism 12 and the solder strip cutting mechanism 14, and is used to press the solder strip group to be cut, so as to form a bending structure at a position between two adjacent battery cells when the solder strip group is stacked with the battery cell. After bending, the solder strip group forms a step between the rear half and the front half, and the rear half is located below the step. In this way, when stacked with the battery cell, the front half of the solder strip is suitable for stacking on the previous battery cell, and the battery cell is stacked above the rear half.

[0055] The specific process of the welding tape providing device 1 providing the welding tape group is as follows: the welding tape pulling device clamps multiple parallel welding tapes from the welding tape roll 11, and then pulls the welding tape through the welding tape clamping device 12, the welding tape pressing device 13 and the welding tape cutting device 14 in sequence. When the welding tape is pulled to the preset position, the welding tape pressing device 13 presses the welding tape to form a bending structure. When the pressing is completed and the welding tape clamping device 12 presses the welding tape, the welding tape cutting device 14 cuts the welding tape to form a welding tape group B with a bending structure in the middle position, and then the welding tape pulling device pulls the cut welding tape group B to move it to the conveying device 3 for laying.

[0056] The battery string production line further includes a solder strip guiding device 5 located at one end of the conveying device 3 close to the solder strip providing device 1 , and the solder strip guiding device 5 guides the solder strip when the solder strip providing device 1 provides the solder strip to the conveying device 3 .

[0057] In this embodiment, the conveying device 3 includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to run, and the first end of the conveyor belt is configured to be able to stepwise extend in a direction away from the second end and to stepwise return in a direction toward the second end, wherein the conveyor belt extends a predetermined length in each step in a direction away from the second end, and the conveyor belt forms an empty loading station at the first end, and the battery cells and the welding ribbon group are stacked at the loading station; wherein the first end is an end of the conveyor belt close to the welding ribbon providing device 1, and the second end is an end away from the first end;

[0058] The welding belt guiding device 5 is arranged to move synchronously with the first end of the conveyor belt.

[0059] Specifically, Figure 11 As shown, the conveying device 3 includes a conveyor belt 31, and also includes a base 32, a fixed platform 34, a stepping platform 33 and a platform moving mechanism for driving the stepping platform 33 to move, wherein: the fixed platform 34 is fixedly connected to the base 32, the stepping platform 33 is slidably connected to the base 32, and the platform moving mechanism can drive the stepping platform 33 to move stepwise toward or away from the fixed platform 34 in the conveying direction of the conveyor belt 31 (the fixed platform 34 is close to the second end of the conveyor belt relative to the stepping platform 33);

[0060] The conveyor belt 31 is arranged on the fixed platform 34 and the stepping platform 33. When the stepping platform 33 moves away from the fixed platform 34, the conveyor belt 31 moves upward from the bottom at the end of the stepping platform 33 away from the fixed platform 34, so that the upper surface of the conveyor belt 31 extends step by step in the direction away from the fixed platform 34 along with the stepping platform 33, that is, the conveyor belt 31 extends towards the first end;

[0061] The solder tape guiding device 5 is arranged to move synchronously with the stepping platform 33, so as to guide the solder tape by making the solder tape guiding device 5 synchronize with the first end of the conveyor belt 31.

[0062] Among them, the conveyor belt driving mechanism 35 for driving the conveyor belt 31 to operate includes a driving roller 351, a first guiding roller 352, a second guiding roller 353 and a tensioning roller 354;

[0063] The driving roller 351 is arranged at the end of the fixed platform 34 away from the stepping platform 33 and is driven by a driving motor to rotate. The first guiding roller 352 is located at the end of the stepping platform 33 away from the fixed platform 34, and the first guiding roller 352 and the second guiding roller 353 are installed on the stepping platform 33. The tensioning roller 354 is located below the first guiding roller 352 and the second guiding roller 353. The tensioning roller 354 is arranged to be able to move back and forth along the conveying direction of the conveyor belt 31 to adjust and tension the conveyor belt 31. Specifically, a slide rail extending along the conveying direction of the conveyor belt 31 can be arranged on the base 32, and the tensioning roller 354 moves back and forth along the slide rail under the drive of a tensioning roller driving cylinder; the conveyor belt 31 is wound around the driving roller 351, the first guiding roller 352, the second guiding roller 353 and the tensioning roller 354 in sequence. Among them, the second guiding roller 353 is located on the conveying surface of the conveyor belt 31; when the stepping platform 33 moves away from the fixed platform 34, the first guiding roller 352 and the second guiding roller 353 move with the stepping platform 33 and guide the conveyor belt 31 to move upward and extend from below. Thus, when the stepping platform 33 moves towards the first end, the conveyor belt 31 extends step by step at the first end.

[0064] In this embodiment, the specific process of stacking the solder tape group B and the battery cells C on the conveying device 3 in sequence is as Figures 2 - 6 shown.

[0065] First, as Figure 2 shown, the solder tape traction device of the solder tape providing device 1 places the cut first solder tape group B on the conveying device 3, and the battery cell providing device stacks the first battery cell C on the latter half of the solder tape group;

[0066] As Figure 3 shown, the conveyor belt of the conveying device 3 steps a predetermined length towards the solder tape providing device 1, and an empty loading station is formed at the first end of the conveying device 3;

[0067] AsFigure 4 As shown in the figure, the solder ribbon providing device 1 places the second solder ribbon group B at the loading station. The first half of the second solder ribbon group B is stacked on the first solar cell C, and the solar cell providing device places the second solar cell C at the loading station. The second solar cell C is stacked on the second half of the second solder ribbon group B;

[0068] As Figure 5 shown, the conveyor belt of the conveying device 3 steps forward a predetermined length in the direction towards the solder ribbon providing device 1, forming an empty loading station at the first end of the conveying device, and continues to stack the solder ribbon group B and the solar cell C at this loading station;

[0069] And so on, obtaining a battery string formed by sequentially stacking a plurality of solder ribbon groups B and solar cells C as Figure 6 shown.

[0070] Among them, after stacking a preset number of solder ribbon groups and solar cells on the conveying device 3, the conveying device conveys the stacked solder ribbon groups and solar cells in the direction towards the second end.

[0071] In this embodiment, the pre-fixing device for pre-fixing the battery string formed by stacking the solar cell C and the solder ribbon group B is a hot pressing device 4 located above the conveying device 3. When the stacked solder ribbon groups and solar cells are conveyed to the hot pressing station below the hot pressing device 4, the hot pressing device 4 fixes the stacked solder ribbon group B and the solar cell C. Of course, it can be understood that the pre-fixing device for fixing the stacked solar cells and solder ribbon groups together is not limited to the above-mentioned hot pressing device 4, and can also be, for example, an adhesive that bonds the solder ribbon group and the solar cell together.

[0072] In this embodiment, in order to stack the back film A on the back of the battery string formed by stacking the solar cell C and the solder ribbon group B, as Figure 1 shown, the battery string production line includes a back film stacking device 2. The back film stacking device 2 includes a back film conveyor 22 and a film roll 21 wound with a strip-shaped back film A. Among them, the back film conveyor 22 is arranged at the output end of the conveying device 3, and the back film conveyor 22 is provided with a back film conveyor belt running in a direction away from the conveying device 3;

[0073] The back film A released from the film roll 21 wound with the strip-shaped back film A is laid on the back film conveyor belt from one end of the back film conveyor 22 close to the conveying device 3 and moves along with the back film conveyor belt;

[0074] The battery string on the conveying device 3 is conveyed from the output end of the conveying device 3 to the back film A on the back film conveyor 22 after pre-fixing. During the process of the back film conveyor 22 conveying the back film A and the battery string, the battery string gradually moves onto the back film A, realizing the stacking of the back film A on the back of the battery string.

[0075] Optionally, the back film conveyor 22 further includes a bottom plate. The upper layer of the back film conveyor belt is supported on the bottom plate. Adsorption holes are provided on both the back film conveyor belt and the bottom plate. The back film A is adsorbed on the back film conveyor belt through the adsorption holes to move together with the back film conveyor belt. Of course, the end of the back film A can also be pressed on the back film conveyor belt by a pressing device to move along with the back film conveyor belt.

[0076] Optionally, the back film conveyor 22 further includes a heating mechanism for heating the bottom plate. By heating the bottom plate through the heating mechanism, the back film A is fixed on the battery string.

[0077] In this embodiment, the battery string production line is provided with a front film stacking device, which is configured to stack a plurality of front films D on the pre-fixed battery string. Among them, the i-th front film D is stacked on the first half of the (i + 1)-th solder tape group B.

[0078] Alternatively, the front film stacking device is configured to stack a strip-shaped front film D extending along the length direction of the battery string on the pre-fixed battery string. The strip-shaped front film D extends and is laid on at least two solder tape groups B on the battery string.

[0079] As Figure 1 shown, the front film stacking device may include a film tape roll 7 wound with the front film D. The strip-shaped front film D is pulled from the film tape roll 7 wound with the front film D, and then cut into a plurality of front films D suitable for stacking on the solder tape group B, or the front film D is pulled from the film tape roll 7 wound with the front film D and stacked on the battery string along the length direction of the battery string. The length of the front film D extends at least to two solder tape groups B.

[0080] The battery string production line further includes a secondary hot pressing device, which hot presses the battery string stacked with the front film D and the back film A, so that the front film D and the back film A are hot pressed on the battery string.

[0081] Among them, the secondary hot pressing device is configured to hot press the battery string above the battery string. Specifically, the secondary hot pressing device can be arranged above the back film conveyor 22. When the battery string stacked with the front film D and the back film A is conveyed to the lower part of the secondary hot pressing device, the secondary hot pressing device hot presses the battery string, so that the stacked back film A, solder tape group B, battery cell C and front film D are fixedly connected together.

[0082] Alternatively, a secondary hot pressing device is provided on the front film stacking device. When the front film stacking device releases the front film D on the battery string, the released front film D is hot pressed by the secondary hot pressing device.

[0083] As Figure 1As shown, the battery string production line further includes a string dividing and cutting device 8, which is configured to divide the overall battery string stacked with the front film A and the back film D into multiple independent battery strings of a predetermined length.

[0084] The following describes the specific process of stacking the back film A and the front film D on the battery string formed by stacking the solder tape group B and the battery cells C. Figures 6 - 10 As shown in, the solder tape group B and the battery cells C are stacked in sequence to form a battery string, which is then conveyed to the hot pressing device 4 for hot pressing and fixing.

[0085] As Figure 6 shown, the solder tape group B and the battery cells C are stacked in sequence to form a battery string, which is then conveyed to the hot pressing device 4 for hot pressing and fixing.

[0086] As Figure 7 and Figure 8 shown, the front film D is stacked on the front side (i.e., the upper side of the battery string) of the battery string hot pressed by the hot pressing device 4. In this embodiment, the i-th front film D is stacked on the first half of the (i + 1)-th solder tape group.

[0087] As Figure 9 and Figure 10 shown, the back film A drawn from the film roll 21 wound with the strip-shaped back film A is laid on the back film conveyor belt from one end of the back film conveyor 22 close to the conveying device 3; after the battery string is gradually conveyed from the conveying device 3 onto the back film conveyor 22, the battery string is stacked on the back film A on the back film conveyor 22. During the process that the back film conveyor belt drives the back film A and the battery string on the back film A to run in the direction away from the conveying device 3, the back film A is stacked on the back side (i.e., the lower side) of the battery string.

[0088] When the back film conveyor 22 conveys the battery string stacked with the back film A and the front film D to the lower part of the secondary hot pressing device (the secondary hot pressing device is located above the back film conveyor 22), the secondary hot pressing device hot presses the battery string so that the stacked back film A, solder tape group B, battery cells C, and front film D are fixed together.

[0089] Of course, after the solder tape group B and the battery string C are hot pressed and fixed by the hot pressing device 4, the back film A can also be fixed on the battery string by heating the bottom plate under the back film conveyor belt, and the front film D is hot pressed on the battery string by the front film stacking device when releasing the front film D.

[0090] Those skilled in the art can understand that the battery string production line provided by the present invention is not limited to the above production method. For example, after stacking the back film A through the back film conveyor 22, the front film D can be stacked on the battery string output by the back film conveyor 22. Or, after stacking the front film D on the front side, the battery string can be flipped, and the back film A can be stacked above the other side of the battery string.

[0091] It can also be understood that the battery string production line provided by the present invention can also stack only the front film D or only the back film A on the battery string formed by stacking the battery cells and the welding tapes.

[0092] According to another aspect of the present invention, there is also provided a battery string production device, which includes at least two battery string production lines as above, and the at least two battery string production lines are arranged in parallel.

[0093] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including the combination of each specific technical feature in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A battery string production line, characterized in that, the battery string production line includes a solder tape providing device, a cell providing device, a conveying device, and a pre-fixing device; wherein, the solder tape providing device is configured to place a solder tape group on the conveying device, wherein each solder tape group includes a plurality of parallel solder tape segments, the solder tape providing device includes a plurality of solder tape reels, a solder tape pressing mechanism, a solder tape cutting mechanism, and a solder tape traction mechanism, the solder tape reels, the solder tape pressing mechanism, the solder tape cutting mechanism, and the solder tape traction mechanism are arranged in sequence along the extension direction of the solder tape, the solder tape traction mechanism traction the solder tape through the solder tape pressing mechanism and the solder tape cutting mechanism to a preset position, and when the solder tape pressing mechanism presses the solder tape, the solder tape cutting mechanism cuts the solder tape to form the solder tape group including a plurality of solder tape segments, and the solder tape traction mechanism clamps the cut solder tape group and places it on the conveying device; the cell string providing device places cells on the conveying device; wherein, the i-th cell is stacked on the second half of the i-th solder tape group, and the first half of the (i + 1)-th solder tape group is stacked on the i-th cell to form a battery string, where i is any natural number greater than 0; the pre-fixing device is configured to pre-fix the battery string stacked on the conveying device, so that the stacked cells and solder tape groups are partially or fully fixedly connected together; the battery string production line further includes at least one of a back film stacking device and a front film stacking device; wherein, the back film stacking device is configured to place a back film, so that the back film is stacked on the back of the pre-fixed battery string; the front film stacking device is configured to stack a front film on the front of the pre-fixed battery string; the battery string production line further includes a solder tape guiding device at one end of the conveying device close to the solder tape providing device, and the solder tape guiding device guides the solder tape when the solder tape providing device provides the solder tape to the conveying device; the battery string production line is provided with the front film stacking device, and the front film stacking device is configured to stack a plurality of the front films on the pre-fixed battery string, wherein the i-th front film is stacked on the first half of the (i + 1)-th solder tape group; or, the front film stacking device is configured to stack a strip-shaped front film extending along the length direction of the battery string on the pre-fixed battery string, and the strip-shaped front film extends and spreads on at least two solder tape groups on the battery string.

2. The battery string production line according to claim 1, characterized in that, the battery string production line includes the back film stacking device, and the back film stacking device includes a back film conveyor and a film tape reel wound with a strip-shaped back film, wherein the back film conveyor is arranged at the output end of the conveying device, and a back film conveyor belt running in a direction away from the conveying device is arranged on the back film conveyor; the back film released by the film tape reel is laid on the back film conveyor belt from one end of the back film conveyor close to the conveying device and moves along with the back film conveyor belt; The battery string on the conveying device is conveyed from the output end of the conveying device to the back film on the back film conveyor after pre-fixing. During the process of the back film conveyor conveying the back film and the battery string, the battery string gradually moves onto the back film, realizing the stacking of the back film on the back of the battery string.

3. The battery string production line according to claim 2, wherein, the back film conveyor further includes a bottom plate, the upper part of the back film conveyor belt is supported on the bottom plate, adsorption holes are provided on both the back film conveyor belt and the bottom plate, and the back film is adsorbed on the back film conveyor belt through the adsorption holes.

4. The battery string production line according to claim 3, wherein, the back film conveyor further includes a heating mechanism for heating the bottom plate, and the back film is fixed on the battery string by heating the bottom plate through the heating mechanism.

5. The battery string production line according to claim 1, wherein, the solder tape providing device further includes a solder tape pressing mechanism, which is arranged between the solder tape pressing mechanism and the solder tape cutting mechanism, and is used for pressing the solder tape group to be cut, so as to form a bending structure at the position between two adjacent battery slices when the solder tape group is stacked with the battery slices.

6. The battery string production line according to claim 1, wherein, the conveying device includes a conveyor belt and a conveyor belt driving mechanism for driving the conveyor belt to run. The first end of the conveyor belt is set to be able to stepwise extend in the direction away from the second end and be able to stepwise return in the direction towards the second end. Wherein, every time the conveyor belt stepwise extends a predetermined length in the direction away from the second end, an empty loading station is formed at the first end of the conveyor belt, and the battery slices and the solder tape group are stacked at the loading station; wherein, the first end is the end of the conveyor belt close to the solder tape providing device, and the second end is the end far from the first end; the solder tape guiding device is set to move synchronously with the first end of the conveyor belt.

7. The battery string production line according to claim 1, wherein, the battery string production line further includes a secondary hot pressing device, which hot presses the battery string stacked with the front film and the back film, so that the front film and the back film are hot pressed on the battery string.

8. The battery string production line according to claim 7, wherein, the secondary hot pressing device is set to hot press the battery string above the battery string. The battery string stacked with the front film is conveyed to the lower part of the secondary hot pressing device, and the secondary hot pressing device hot presses the battery string; or, the secondary hot pressing device is provided on the front film stacking device. When the front film stacking device releases the front film on the battery string, the released front film is hot pressed through the secondary hot pressing device.

9. The battery string production line according to any one of claims 1-6, wherein, The battery string production line further includes a string splitting and cutting device, which is configured to divide the overall battery string stacked with the front film and the back film into multiple independent battery strings of a predetermined length.

10. A battery string production device, characterized in that the battery string production device includes at least two battery string production lines according to any one of claims 1-9, and the at least two battery string production lines are arranged in parallel.

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