A battery string preparation method, device and battery string

Abstract

The present invention relates to the technical field of battery cell string manufacturing technology, and specifically invents a battery string preparation method, equipment and battery string. The method comprises the following steps: using a carrier to adsorb and fix a battery cell assembly to move forward along a first circulating track; after the previous carrier carries the previous battery cell assembly to a preset position, there is a height difference between the previous battery cell assembly and the next battery cell assembly carried by the next carrier, at this time, the next carrier moves forward to align with the previous carrier, so that the extended section of the welding tape of the next battery cell assembly is laid on the top surface of the battery cell of the previous battery cell assembly; laying the front tape, so that the extended section of the welding tape of the next battery cell assembly is fixed to the front surface of the battery cell of the previous battery cell assembly through the front tape, thereby connecting two adjacent battery cell assemblies in series. The battery string preparation method, equipment and battery string can effectively improve the efficiency of battery string preparation.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell string manufacturing, and in particular to a battery string manufacturing method, equipment and battery string. Background Art

[0002] The traditional busbar-free cell stringing process is to contact each welding ribbon group with the front of the first cell and the back of the second cell of two adjacent cells and perform pre-welding connection. Conventional welding processes include infrared lamp irradiation and laser welding, connecting into a long string of cells through a stacking process, and then cutting to form a cell string of the required length.

[0003] With the change and innovation of technology, the industry has developed a non-welding method to achieve the stringing of cells. At present, the non-welding stringing method is achieved by attaching adhesive strips, that is, the soldering strips and the cells are fixed by using a process of setting a strip of transparent adhesive strips corresponding to the soldering strips and bonding them to the cells. This optimizes the original use of a whole piece of bonding film to bond the cells, avoiding the impact of weak lighting on the entire surface. The transparent adhesive strip bonding process replaces the traditional soldering strip fixation process of pre-welding treatment of the cells, and has become an innovative development direction in the process of stringing cells with its simple process and low cost.

[0004] At present, the stringing efficiency of the method and equipment using adhesive strips to attach the cells in the stringing process needs to be improved. In order to solve the drawbacks of this process, optimize the adhesive strip attaching process, and improve the stringing efficiency of the cells, it is urgent to develop a stringing method and device using adhesive strips to attach the cells. Summary of the invention

[0005] The purpose of the present invention is to provide a battery string preparation method, equipment and battery string, which can effectively improve the efficiency of battery string preparation.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A method for preparing a battery string comprises the following steps:

[0008] The carrier is used to absorb and fix the battery cell assembly to move forward along the first circulating track; the battery cell assembly includes a battery cell and a group of welding strips adhered to the back of the battery cell by a back tape, and one end of the welding strip extends out of the battery cell to form a welding strip extension section;

[0009] After the previous carrier carries the previous cell assembly to a preset position, there is a height difference between the previous cell assembly and the next cell assembly carried by the next carrier. At this time, the next carrier moves forward and aligns with the previous carrier, so that the extended section of the welding ribbon of the next cell assembly is overlapped on the top surface of the cell of the previous cell assembly;

[0010] The front adhesive tape is laid so that the extended section of the welding tape of the latter battery cell assembly is fixed to the front surface of the battery cell of the former battery cell assembly through the front adhesive tape, thereby connecting two adjacent battery cell assemblies in series.

[0011] As a preferred embodiment of the present invention, the method comprises the steps of: preparing the battery cell assembly in advance; the preparing the battery cell assembly in advance comprises:

[0012] A group of composite parts are prepared on a supporting frame that moves cyclically, wherein the composite parts are welding strips with a backing tape bonded to the back side;

[0013] Loading a group of the composite parts onto the carrier for adsorption and fixation;

[0014] A battery cell assembly is obtained by placing a battery cell on a group of the composite parts carried by the carrier.

[0015] As a preferred embodiment of the present invention, the step of preparing a group of composite parts on a cyclically moving support frame comprises:

[0016] The support frame is used to absorb and fix the adhesive tape of the first adhesive tape roll and move it forward;

[0017] Cutting a group of adhesive tapes drawn from the first adhesive tape roll to obtain a group of back adhesive tapes of a preset length;

[0018] Pressing and bonding a group of soldering ribbons pulled out from the soldering ribbon roll onto the corresponding backing tape;

[0019] The welding strip is cut to obtain a group of the composite parts.

[0020] As a preferred embodiment of the present invention, at least two adjacent support brackets jointly absorb and fix the tape of the first tape roll to move.

[0021] As a preferred embodiment of the present invention, the method includes the steps of: preparing the battery cell assembly on the carrier in advance; the preparing the battery cell assembly on the carrier in advance includes sequentially laying a group of the back tapes, a group of the welding tapes and the battery cells with the adhesive surface facing upward on the carrier, so as to obtain the battery cell assembly.

[0022] As a preferred embodiment of the present invention, the carrier includes a carrier body, a movable carrier located on the carrier body and having a plurality of vacuum adsorption holes, and a group of springs connected between the carrier body and the movable carrier 11; under the action of the carrier pressing device, the movable carrier overcomes the elastic force of the spring and moves vertically, so that the top surface of the battery cell assembly adsorbed and fixed by the movable carrier is lower than the bottom surface of the welding strip of the next battery cell assembly; or

[0023] The first circulating track is provided with a guide slope so that the top surface of the battery cell assembly that sinks along the guide slope along with the carrier is lower than the bottom surface of the welding strip of the next battery cell assembly.

[0024] As a preferred embodiment of the present invention, the laying of the front tape comprises:

[0025] Pulling the tape of the second tape roll onto the stacked plurality of battery cell assemblies, and pressing and cutting the pulled tape; or

[0026] After the end of the second tape roll is bonded to the top surface of the first battery cell assembly, the tape is pressed and pasted in sequence according to the alignment order of the carriers; and the tape is cut after the pressed and pasted tape reaches a preset length;

[0027] The length of the front tape obtained after cutting is the required length for a battery string.

[0028] As a preferred embodiment of the present invention, the first circulating track is a coil circulating track composed of several sections of coil tracks, and the coil circulating track is slidably fitted with several sliders that move by the magnetic levitation principle; the carrier is connected to the sliders.

[0029] The present invention also provides a battery string preparation device, which is used to implement the above-mentioned battery string preparation method.

[0030] The present invention also provides a battery string, which is prepared by using the above-mentioned battery string preparation method.

[0031] The beneficial effects of the present invention are:

[0032] 1. The use of a circulating conveyor line, especially a magnetic levitation circulating conveyor line to transport carriers allows multiple carriers to move freely to adapt to the preparation and gluing of battery cell components. After completing the action, the carrier can cycle to the starting position without affecting the normal action of other carriers. The action process is orderly and efficient.

[0033] 2. Pull out the front tape of a battery string length at one time for pasting, which can save the waiting time when pasting the front tape on each battery cell assembly, effectively save the preparation time of the front tape, and improve the production rhythm and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a method for preparing a battery string provided by the present invention.

[0035] Figure 2 yes Figure 1 A flow chart of an implementation method for preparing a battery cell assembly.

[0036] Figure 3 yes Figure 2 Flow chart of the preparation process of composite parts.

[0037] Figure 4 yes Figure 2 Schematic diagram of the structure of the prepared composite part.

[0038] Figure 5 It is a structural schematic diagram of a battery string preparation device provided by the present invention.

[0039] Figure 6 It is a top view of a battery string preparation device provided by the present invention.

[0040] Figure 7 It is a cross-sectional view of a battery string preparation device provided by the present invention.

[0041] Figure 8 yes Figure 7 The enlarged schematic diagram of point Ⅰ in FIG.

[0042] Fig. 9 yes Figure 7 An enlarged schematic diagram of point II in FIG.

[0043] Fig.10 It is a partial structural schematic diagram of the battery cell assembly connected in series after laying the front tape. DETAILED DESCRIPTION

[0044] In the existing preparation process of a busbar-free battery string, since it is necessary to cover the two sides of the battery sheet with welding strips for fixing, the production cycle is slow in the actual preparation process. The present application proposes a battery string preparation method and equipment, which can save operation time and improve production cycle and efficiency. The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and through specific implementation methods.

[0045] The present invention provides a method for preparing a battery string, such as Figure 1 As shown, the battery string preparation method includes the following steps:

[0046] S1: Prepare a cell assembly 100. The cell assembly 100 includes a cell 130 and a group of solder strips 120 bonded to the back of the cell 130 via a back tape 110, and one end of the solder strip 120 extends out of the cell 130 to form a solder strip extension section 121;

[0047] As a preferred implementation of step S1, Figure 2-4As shown, preparing a battery cell assembly 100 includes: preparing a group of composite parts 150 on a supporting frame 51 that moves in a circular motion, wherein the composite part 150 is a welding strip 120 with a back tape 110 adhered to the back side; loading the group of composite parts 150 located on the supporting frame 51 onto a carrier 1 that moves in a circular motion for adsorption and fixation; placing a battery cell 130 on the group of composite parts 150 located on the carrier 1, thereby obtaining the battery cell assembly 100.

[0048] Further, preparing a set of composite parts 150 on the cyclically moving support frame 51 includes: using the support frame 51 to absorb and fix the tape of the first tape roll 71 to move forward; pulling the tape on the support frame 51 to move to Figure 5 After the first preset position is reached, the tape is cut to obtain a set of back tapes 110 of a preset length; the support frame 51 carries a set of back tapes 110 and moves to the first preset position. Figure 5 After reaching the second preset position as shown, a group of soldering tapes pulled out from the soldering tape roll 54 are pressed and bonded to the corresponding back tapes 110 ; the soldering tapes are cut to obtain a group of composite parts 150 .

[0049] The support frame 51 is positioned and placed on the support frame carrier 50, and the support frame carrier 50 is connected to the circulating conveyor line. The top surface of the support frame 51 is provided with a plurality of vacuum adsorption holes, so that the support frame 51 has an adsorption and fixing function. In this embodiment, at least two adjacent support frames 51 jointly adsorb and fix the tape of the first tape roll 71 to move, so that when cutting, the two sides of the tape cutting position are respectively adsorbed and fixed by the front and rear support frames 51, thereby preventing the tape from being disconnected from the support frame 51 after cutting.

[0050] In this embodiment, in order to avoid interference, the second preset position is higher than the first preset position. A lifting assembly 56 is provided below the conveying surface of the circulating conveyor line, and the lifting assembly 56 includes a lifting plate and a lifting cylinder, which is used to lift the support frame 51 carrying a group of back-side adhesive tapes 110 upward to the second preset position.

[0051] In this embodiment, the back tape cutting mechanism 52 is used to cut the tape to form a back tape 110 of a preset length, the welding tape pulling mechanism 53 is used to pull the welding tape from the welding tape roll 54 to above the second preset position, and the first welding tape cutting mechanism 55 is used to cut the welding tape to form a welding tape 120 of a preset length. Among them, the back tape cutting mechanism 52 and the first welding tape cutting mechanism 53 both include a cutting knife and a cylinder for driving the cutting knife to rise and fall. The welding tape pulling mechanism 53 includes a pulling hand and a first linear driving module for driving the pulling hand to move linearly; a plurality of pairs of clamping jaws are arranged side by side on the pulling hand, and each pair of clamping jaws is connected to a clamping jaw cylinder for driving the opening and closing thereof; the first linear driving module is preferably a linear slide or a motor-driven screw assembly, etc.

[0052] In this embodiment, Figure 8 As shown, the carrier 1 includes a carrier body, a movable carrier 11 located on the carrier body and having a plurality of vacuum adsorption holes, and a group of springs 12 connected between the carrier body and the movable carrier 11. After a group of composite parts 150 are prepared on the support frame 51, a composite part feeding mechanism 61 is used to feed the group of composite parts 150 on the support frame 51 to the movable carrier 11, and the group of composite parts 150 are adsorbed and fixed on the movable carrier 11; a battery cell feeding mechanism 62 is used to feed the battery cell 130 onto the composite part 150 adsorbed and fixed by the movable carrier 11 to form a battery cell assembly 100.

[0053] Among them, the composite part loading mechanism 61 and the battery cell loading mechanism 62 both include a group of vacuum suction heads and a driving module for driving a group of vacuum suction heads to move in a two-dimensional space or a three-dimensional space. They are conventional vacuum adsorption and handling structures and will not be described in detail here.

[0054] It should be noted that before cutting the solder strip, the composite feeding mechanism 61 cooperates with the lifting plate to press and bond the solder strip to the back tape 110 , and there is no need to set up an additional pressing mechanism to press and bond the solder strip to the back tape 110 .

[0055] In this preferred embodiment, the support frame 51 and the carrier 1 move independently of each other. Since the composite part 150 is prepared in advance using the support frame 51, and then the composite part 150 and the battery cell 130 are loaded on the carrier 1 to complete the preparation of the battery cell assembly 100, the production cycle is more compact and the production efficiency is higher.

[0056] As another preferred embodiment of step S1, a carrier 1 that moves along a first circulating track and has an adsorption and fixing function is used to prepare a battery cell assembly 100, including sequentially laying a group of back tapes 110 with adhesive surfaces facing upward, a group of welding tapes 120 and battery cells 130 on the carrier 1, so that the welding tapes 120 are bonded to the back of the battery cells 130 through the back tapes 110, thereby obtaining the battery cell assembly 100.

[0057] S2: The carrier 1 absorbs and fixes the battery cell assembly 100 and moves forward along the first circulating track 2.

[0058] Among them, the first loop track 2 is a coil loop track composed of several sections of coil tracks, and the coil loop track is slidably matched with several sliders that move by the magnetic suspension principle; the carrier 1 is connected to the slider, and can move forward with the slider, stay at the working position, and move forward together with the previous carrier 1 and the aligned multiple carriers 1. In this embodiment, the iTS-L intelligent flexible track change ring line produced by Guoli Intelligent Manufacturing is used as the conveying line of the carrier 1.

[0059] S3: After the previous carrier 1 carries the previous battery cell assembly 100 to the preset position, there is a height difference between the previous battery cell assembly 100 and the subsequent battery cell assembly 100 carried by the subsequent carrier 1. At this time, the subsequent carrier 1 moves forward and aligns with the previous carrier 1, so that the welding ribbon extension section 121 of the subsequent battery cell assembly 100 is overlapped on the top surface of the battery cell 130 of the previous battery cell assembly 100.

[0060] As a preferred implementation of step S3, the platform pressing device 3 is used to press down the movable platform 11, so that the movable platform 11 overcomes the elastic force of the spring and moves vertically, so that the top surface of the battery cell assembly 100 adsorbed and fixed by the movable platform 11 is lower than the bottom surface of the welding strip 120 of the next battery cell assembly 100.

[0061] Specifically, Figure 8 As shown, the platform pressing device 3 includes two mounting plates 31 disposed on both sides of the first circulating track, and a group of rollers 32 in a "U" shape are installed on the opposite sides of the two mounting plates 31, and each roller 32 is in rolling contact with the top surface of the movable platform 11. When the movable platform 11 moves to the platform pressing device 3 with the carrier 1, the movable platform 11 is gradually pressed down to a preset height under the action of the two groups of rollers 32.

[0062] As another preferred embodiment of step S3 , the first circulating track is provided with a guide slope so that the top surface of the battery cell assembly 100 that sinks along the guide slope with the carrier 1 is lower than the bottom surface of the welding strip of the next battery cell assembly 100 .

[0063] S4: Laying the front tape 140, so that the welding tape extension section 121 of the subsequent battery cell assembly 100 is fixed to the front surface of the battery cell 130 of the previous battery cell assembly 100 through the front tape 140, so as to connect two adjacent battery cell assemblies 100 in series.

[0064] As a preferred embodiment of step S4, laying the front tape 140 includes: pulling the tape of the second tape roll onto the stacked plurality of battery cell assemblies 100, pressing and cutting the pulled tape, such as Figure 6 shown.

[0065] Specifically, Figure 5-7As shown, the front tape gluing device 4 includes a pressing mechanism 41 and a tape cutting mechanism 42, a tape pressing mechanism 43 and a tape pulling mechanism 44 which are sequentially arranged along the tape pulling direction. The tape pulling mechanism 44 is used to pull out the tape from the second tape roll 72; the tape pressing mechanism 43 is used to press and fix the end of the tape to be cut on the battery cell assembly 100 located below; the tape cutting mechanism 42 is used to cut the tape pulled out by the tape pulling mechanism 44 to form a front tape 140 of a preset length; the pressing mechanism 41 is used to press and hold the front tape 140 so that the front tape 140 is bonded to the top surface of each stacked battery cell assembly 100.

[0066] The adhesive tape pulled out from the second adhesive tape roll 72 passes under the limiting roller group so that the adhesive tape is as close as possible to the top surface of the movable carrier 11. The structure of the adhesive tape pulling mechanism 44 is substantially the same as that of the welding tape pulling mechanism 53.

[0067] The tape pressing mechanism 43 includes a rotatable lower pressing roller and a cylinder for driving the lower pressing roller to rise and fall, wherein the pressing position of the lower pressing roller on the welding tape is close to the position where the tape is to be cut to prevent the tape from moving during the cutting process.

[0068] Among them, Fig. 9 As shown, the tape cutting mechanism 42 includes an annular cutter 421 and a driving assembly that drives the annular cutter 421 to roll and cut along the width direction of the tape; the driving assembly includes a slider 422 that slides along the guide rail, a gear 423, a rack 424 that meshes with the gear 423, and a motor 425 installed on the slider 422, and the motor 425 drives the gear 423 and the annular cutter 421 to rotate coaxially; the slider 422 is slidably arranged above the magnetic suspension conveyor line 2, and the rack 424 is fixed on the frame of the magnetic suspension conveyor line 2. When the motor 425 is working, the motor 425 itself can be moved, and at the same time, the annular cutter 421 rotates, so as to roll and cut the tape.

[0069] The pressing mechanism 41 is used to press and hold the cut front tape 140 back and forth, so that the front tape 140 firmly adheres the welding tape extension section 121 to the top surface of the corresponding battery cell 130. In this embodiment, the pressing mechanism 41 includes a roller seat, a roller rotatably arranged on the roller seat, and a second linear drive module that drives the roller seat to move linearly. The second linear drive module includes a second gear, a second rack meshing with the second gear, and a second motor that drives the second gear to rotate. The second motor is installed on the roller seat; the second linear drive module can also be a linear slide, etc. In the process of pressing the front tape 140, the tape puller is in a state of clamping the tape; after the pressing is completed, the tape puller releases the tape.

[0070] The front tape gluing device 4 also includes a tape guiding mechanism 45 disposed between the second tape roll 72 and the tape cutting mechanism 42. The tape guiding mechanism 45 is used to ensure that the position of each tape will not be deflected, and includes a positioning block and a roller rotatably disposed in the positioning block. The top surface of the positioning block is provided with a plurality of positioning grooves that expose the roller at intervals along the axial direction of the roller; the tape pulled out from the second tape roll 72 passes through the positioning grooves and is pressed on the roller. The surface of the roller is a non-stick layer.

[0071] As another preferred embodiment of step S4, laying the front tape 140 includes: after bonding the end of the second tape roll to the top surface of the first battery cell assembly 100, pressing and pasting them in sequence according to the alignment order of each carrier 1; and cutting the tape after the pressed and pasted tape reaches a preset length.

[0072] In the above two embodiments, the length of the front tape 140 obtained after cutting is the required length of a battery string.

[0073] It should be noted that, in the present invention, the length of the first group of welding ribbons 120 of the first battery string is greater than the length of a single battery cell 130 and less than the sum of the lengths of two battery cells 130, the length of the first group of welding ribbons 120 of the remaining battery strings is greater than the sum of the lengths of the two battery cells 130, and the length of the remaining groups of welding ribbons 120 of each battery string is approximately equal to the sum of the lengths of the two battery cells 130. Taking a battery string containing N (N≥2) battery cells 130 as an example, when preparing the (N+1)th battery cell assembly 100, the length of its welding ribbon 120 is greater than the sum of the lengths of the two battery cells 130; after the (N+1)th battery cell assembly 100 is stacked on the Nth battery cell assembly 100, the gap between the (N+1)th battery cell assembly 100 and the Nth battery cell assembly 100 is larger, such as Fig.10 As shown; in this way, after cutting the welding strip, the tail welding strip 120 of the previous battery string can extend out of the corresponding battery cell 130 and the head welding strip 120 of the next battery string can extend out of the corresponding battery cell 130. Similarly, when preparing the (2N+1)th, (3N+1)th, (4N+1)th, ... battery cell assemblies 100, the method for preparing the (N+1)th battery cell assembly 100 can be used.

[0074] The battery string preparation method further includes the steps of cutting the solder strip and removing the battery string. Specifically, after laying the front adhesive tape 140, the second solder strip cutting mechanism 8 is used to cut the solder strip. Fig.10The welding strip cutting position shown in the figure is cut to obtain a single battery string; the single battery string can be taken away by using the unloading and handling mechanism 9. Among them, the second welding strip cutting mechanism 8 is used to cut the welding strip after laying the front tape 140 to obtain a battery string of a preset length, including a cutting knife and a cylinder for driving the welding strip cutting knife to rise and fall. The unloading and handling mechanism 9 includes a suction head assembly and a driving module for driving the suction head assembly to move in a two-dimensional space or a three-dimensional space.

[0075] It should be noted that in the present invention, the spacing between two adjacent carriers 1 in the aligned state is greater than 0. The magnetic suspension conveyor line is used to convey the carrier 1, and the position accuracy can be accurate to ±5um. Not only can the transmission accuracy meet the placement requirements of the welding strip, but it is also conducive to ensuring the accuracy of the tape attachment position.

[0076] The present invention also provides a battery string preparation device, the structure of the battery string preparation device is as follows Figure 5 and 6 As shown, it is used to implement the above-mentioned battery string preparation method. Among them, the structure of the battery string preparation equipment has been disclosed in the above-mentioned method embodiment.

[0077] The present invention also provides a battery string, the structure of which is as follows: Fig.10 As shown, it is prepared by the above-mentioned battery string preparation method. Among them, the structure of the battery string has been disclosed in the above-mentioned method embodiment.

[0078] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A method for preparing a battery string, characterized in that: The following steps are involved: Prepare a battery cell assembly; the battery cell assembly includes a battery cell and a group of welding strips bonded to the back of the battery cell by a back tape, and one end of the welding strip extends out of the battery cell to form a welding strip extension section; The carrier is used to absorb and fix the battery cell assembly to move forward along the first circulation track; After the previous carrier carries the previous cell assembly to a preset position, there is a height difference between the previous cell assembly and the next cell assembly carried by the next carrier. At this time, the next carrier moves forward and aligns with the previous carrier, so that the extended section of the welding ribbon of the next cell assembly is overlapped on the top surface of the cell of the previous cell assembly; Laying a front tape so that the extended section of the welding tape of the latter battery cell assembly is fixed to the front surface of the battery cell of the former battery cell assembly through the front tape, thereby connecting two adjacent battery cell assemblies in series; The carrier comprises a carrier body, a movable carrier located on the carrier body and having a plurality of vacuum adsorption holes, and a group of springs connected between the carrier body and the movable carrier; under the action of the carrier pressing device, the movable carrier overcomes the elastic force of the springs and moves vertically, so that the top surface of the battery cell assembly adsorbed and fixed by the movable carrier is lower than the bottom surface of the welding strip of the next battery cell assembly; or The first circulating track is provided with a guide slope so that the top surface of the battery cell assembly that sinks along the guide slope along with the carrier is lower than the bottom surface of the welding strip of the next battery cell assembly.

2. A method for preparing a battery string according to claim 1, characterized in that: The preparation of the battery cell assembly comprises: A group of composite parts are prepared on a supporting frame that moves cyclically, wherein the composite parts are welding strips with a backing tape bonded to the back side; Loading a group of the composite parts onto the carrier for adsorption and fixation; A battery cell assembly is obtained by placing a battery cell on a group of the composite parts carried by the carrier.

3. A method for preparing a battery string according to claim 2, characterized in that: The method of preparing a set of composite parts on a cyclically moving support frame comprises: The support frame is used to absorb and fix the adhesive tape of the first adhesive tape roll and move it forward; Cutting a group of adhesive tapes drawn from the first adhesive tape roll to obtain a group of back adhesive tapes of a preset length; Pressing and bonding a group of soldering ribbons pulled out from the soldering ribbon roll onto the corresponding backing tape; The welding strip is cut to obtain a group of the composite parts.

4. A method for preparing a battery string according to claim 3, characterized in that: At least two adjacent support brackets jointly absorb and fix the tape of the first tape roll to move.

5. A method for preparing a battery string according to claim 1, characterized in that: The method comprises the steps of: preparing the battery cell assembly on the carrier in advance; the preparing the battery cell assembly on the carrier in advance comprises sequentially laying a group of the back tapes, a group of the welding tapes and the battery cells with the adhesive surface facing upward on the carrier, so as to obtain the battery cell assembly.

6. A method for preparing a battery string according to claim 1, characterized in that: The laying of the front tape comprises: Pulling the tape of the second tape roll onto the stacked plurality of battery cell assemblies, and pressing and cutting the pulled tape; or After the end of the second tape roll is bonded to the top surface of the first battery cell assembly, the tape is pressed and pasted in sequence according to the alignment order of the carriers; and the tape is cut after the pressed and pasted tape reaches a preset length; The length of the front tape obtained after cutting is the required length for a battery string.

7. A method for preparing a battery string according to claim 1, characterized in that: The first circulating track is a coil circulating track composed of several sections of coil tracks, and several sliders that move by the magnetic suspension principle are slidably matched on the coil circulating track; the carrier is connected to the sliders.

8. A battery string preparation device, characterized in that: The battery string preparation device is used to implement the battery string preparation method according to any one of claims 1 to 7.

9. A battery string, characterized in that: The battery string is prepared by the battery string preparation method according to any one of claims 1 to 7.

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