Thermal composite cell manufacturing method and system

Abstract

The present invention discloses a method and system for manufacturing a thermal composite cell, the method including the steps of unwinding a separator, unwinding the separator using a separator unwinding device, thermocompression bonding of pole pieces, thermocompression bonding of a first pole piece to a first surface of the separator 1 and a second pole piece to a second surface of the separator, folding the separator and pole pieces into a Z-shape, and crimping the cell, the thermal composite cell manufacturing system including a separator unwinding device, a pole piece conveying device, a thermocompression bonding device, a folding pin, and a crimping device. This type of thermal composite cell manufacturing method and system has the advantages of simple structure and low implementation cost, and in practical application can effectively improve stacking accuracy and stacking quality, greatly increase stacking efficiency, and improve product safety.

Description

[Technical field]

[0001] The present invention relates to the field of lithium battery production and processing, and in particular to a method and system for manufacturing a thermal composite cell. [Background technology]

[0002] In the production and processing of lithium batteries, the cell stacking process is a very important process, which has a very important impact on the overall battery quality and production efficiency.

[0003] Conventional stacked cells include Z-stacking, bag-making stacking, and composite stacking. Here, Z-stacking is a cell made by repeatedly stacking positive and negative electrode pieces alternately and separating them from the middle with a separator. Such a cell has a low impedance, but the electrode pieces are easily misaligned and short-circuited, and the battery made from such a cell has a disadvantage of poor safety. Bag-making stacking is generally performed by aligning the top and bottom surfaces of the positive electrode piece with the separator, and then heat-pressing the four sides to make a bag for the positive electrode piece, and then stacking it alternately with the negative electrode. Such a cell has a low impedance, but does not completely solve the problem of misalignment of the positive and negative electrode pieces, and the process is complicated and the efficiency is low. Composite stacking is a cell made by first thermocompression-bonding a positive electrode piece (negative electrode piece) and upper and lower separators to create a stacking unit, then repeatedly stacking electrode pieces of opposite polarity, and finally thermocompression-bonding the whole. The production efficiency of such cells is low, just like Z-stacking and bag-made stacking, and it is difficult to meet the rapidly increasing demand for power batteries in the current new energy market.

[0004] From the above, the conventional stacking method has technical defects such as pole pieces being easily misaligned, poor battery safety, complicated stacking process, low stacking efficiency, high production cost, etc., which restrict the further development and popularization of this field.

[0005] In view of this, the present invention aims to provide a new technical solution to solve the existing technical deficiencies. Summary of the Invention [Problem to be solved by the invention]

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a thermal composite cell manufacturing method and system, which solves the technical defects such as complex process, low stacking efficiency, easy to cause stacking misalignment, poor safety, and high implementation cost existing in the prior art. [Means for solving the problem]

[0007] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0008] Step S1 of unwinding the separator by a separator unwinding device; Step S2 of thermocompression bonding the pole pieces, the first pole piece being thermocompression bonded to the first surface of the separator, and the second pole piece being thermocompression bonded to the second surface of the separator, the first pole piece and the second pole piece being pole pieces of opposite polarity, and being thermocompression bonded to both sides of the separator, respectively; Step S3 of folding the separator and the pole piece into a Z-shape, folding the separator with the first pole piece and the second pole piece thermocompression-bonded by a Z-folding method, and stacking the first pole piece and the second pole piece alternately to form a composite stack; and step S4 of crimping the cells and crimping the Z-folded composite stack into a cellular product. A method for manufacturing a thermal composite cell.

[0009] As an improvement of the above technical solution, in step S2, the first pole piece is thermocompression bonded to the first surface of the separator by the first thermocompression bonding device, and the second pole piece is thermocompression bonded to the second surface of the separator by the second thermocompression bonding device, both of which have pre-heating and crimping functions, and the thermocompression bonding work of the first pole piece and the second pole piece is completed by the pre-heating and crimping functions.

[0010] As a further improvement of the above technical solution, before the first pole piece and the second pole piece are thermocompression bonded to the separator, the first pole piece is transported to the side of the first surface of the separator by the first pole piece rotating table, and the second pole piece is transported to the side of the second surface of the separator by the second pole piece rotating table, and after the first pole piece and the second pole piece reach a predetermined position, the first pole piece and the second pole piece are thermocompression bonded to the two side surfaces of the separator.

[0011] As a further improvement of the above technical solution, the first pole piece rotating table has at least one first suction surface, which rotates and transports the first pole piece to a predetermined thermo-compression bonding position, and the second pole piece rotating table has at least one second suction surface, which rotates and transports the second pole piece to a predetermined thermo-compression bonding position.

[0012] As a further improvement of the above technical solution, the first and second attracting surfaces both attract and fix the pole pieces by negative pressure attraction.

[0013] As a further improvement of the above technical solution, the first pole piece rotating base has eight first adsorption surfaces, and eight independent negative pressure control devices are provided within the first pole piece rotating base, each corresponding to one of the first adsorption surfaces; the second pole piece rotating base has eight second adsorption surfaces, and eight independent negative pressure control devices are provided within the second pole piece rotating base, each corresponding to one of the second adsorption surfaces.

[0014] As a further improvement of the above technical solution, before the first pole piece rotating table conveys the first pole piece by the first suction surface, the first pole piece is conveyed by the first loading manipulator to the first Bucketthe first pole piece to the first pole piece positioning platform, the first pole piece positioning platform performs pole piece positioning for the first pole piece, after the positioning of the first pole piece is completed on the first pole piece positioning platform, the first pole piece positioning platform transports the first pole piece to a station corresponding to the first suction surface, and further pushes the first pole piece up to a predetermined position, the first pole piece pushed up to the predetermined position is suction-fixed to the first suction surface, before the second pole piece rotating platform transports the second pole piece by the second suction surface, the second pole piece is loaded to the second pole piece by the second loading manipulator, and the second pole piece is loaded to the second pole piece by the second suction surface. Bucket The first pole piece is then transported from the first pole piece to a second pole piece positioning platform, which performs pole piece positioning on the second pole piece, and after the positioning of the second pole piece is completed on the second pole piece positioning platform, the second pole piece positioning platform transports the second pole piece to a station corresponding to the second suction surface, and further pushes the second pole piece up to a predetermined position, and the second pole piece pushed up to the predetermined position is adsorbed and fixed to the second suction surface.

[0015] As a further improvement of the above technical solution, the first pole piece positioning platform and the second pole piece positioning platform both position the pole piece by a CCD detection positioning device, and the first pole piece positioning platform and the second pole piece positioning platform are both four-station rotary positioning platforms.

[0016] As a further improvement of the above technical solution, after completing step S2, the first pole piece and the second pole piece are distributed on both sides of the separator with offset positions along the longitudinal direction.

[0017] As a further improvement of the above technical solution, the separator is a separator to which a composite adhesive has been applied in advance, and in the process of thermocompression bonding the first pole piece and the second pole piece, the separator to which the composite adhesive has been applied in advance is preheated, and then the composite adhesive on the separator is softened by a preheating operation, and the first pole piece and the second pole piece are further pressed to corresponding positions on the separator and kept under pressure, and the first pole piece and the second pole piece are bonded to corresponding positions on both side surfaces of the separator by the softened composite adhesive.

[0018] As a further improvement of the above technical solution, before the separator is loaded into the separator unwinding device, a pre-folding operation is performed on the separator so that the separator has pre-folds, the pre-folds are alternately provided on two sides of the separator to form Z-shaped pre-folds, and the pitch between two adjacent pre-folds on the separator matches the width dimensions of the first pole piece and the second pole piece.

[0019] As a further improvement of the above technical solution, in step S3, the separator formed by thermo-compression bonding of the first pole piece and the second pole piece is folded alternately into a Z shape by a plurality of folding pins, and there is a separator between the first pole piece and the second pole piece; after the folding is completed, in step S4, the composite stack folded alternately into a Z shape is crimped by a crimping device to become a cell product.

[0020] As a further improvement of the above technical solution, after completing step S2, the first pole piece 11 and the second pole piece 12 are distributed on both sides of the separator 1 with offset positions along the longitudinal direction.

[0021] a separator unwinding device for unwinding the separator; a pole piece transport device for transporting the first pole piece and the second pole piece to a preset position on either side of the separator; a thermocompression bonding device for thermocompression bonding the first pole piece and the second pole piece, which are transported to a predetermined position by the pole piece transport device, to the first surface and the second surface of the separator, respectively, so that after the first pole piece and the second pole piece are thermocompression bonded to the first surface and the second surface of the separator, the first pole piece and the second pole piece are distributed on both side surfaces of the separator with their positions shifted along the vertical direction; A folding pin for pushing the separator along a preset preliminary crease to fold the separator having the first pole piece and the second pole piece thermocompression-bonded together into a Z-shape; and a crimping device for crimping the Z-folded composite stack into a cellular product. A thermal composite cell manufacturing system.

[0022] As an improvement of the above technical solution, the pole piece transport device includes a first pole piece rotating table and a second pole piece rotating table, the first pole piece rotating table and the second pole piece rotating table are respectively arranged on both sides of the separator and arranged so as to be offset from each other, the first pole piece rotating table has a first adsorption surface for adsorbing the first pole piece, the first pole piece rotating table adsorbs the first pole piece by its first adsorption surface, and rotates and transports the first pole piece to a thermo-combining position corresponding to the side of the first surface of the separator in a rotational manner, the second pole piece rotating table has a second adsorption surface for adsorbing the second pole piece, the second pole piece rotating table adsorbs the second pole piece by its second adsorption surface, and rotates and transports the second pole piece to a thermo-combining position corresponding to the side of the second surface of the separator in a rotational manner.

[0023] As a further improvement of the above technical solution, the first pole piece rotating base has eight first adsorption surfaces, and inside the first pole piece rotating base there are eight negative pressure control devices which can be individually controlled and correspond to the eight first adsorption surfaces, respectively; the second pole piece rotating base has eight second adsorption surfaces, and inside the second pole piece rotating base there are eight negative pressure control devices which can be individually controlled and correspond to the eight second adsorption surfaces, respectively.

[0024] As a further improvement of the above technical solution, the first suction surface and the second suction surface are both vacuum suction surfaces, and both the first suction surface and the second suction surface have a plurality of vacuum suction holes distributed thereon.

[0025] As a further improvement of the above technical solution, the present invention further includes a first pole piece positioning platform associated with the first pole piece rotating table and a second pole piece positioning platform associated with the second pole piece rotating table, the first pole piece positioning platform is used for positioning the first pole piece, the second pole piece positioning platform is used for positioning the second pole piece, the first pole piece rotating table can adsorb the first pole piece whose positioning has been completed on the first pole piece positioning platform with its first suction surface, and can further rotate and transport it to a preset thermo-combining position, and the second pole piece rotating table can adsorb the second pole piece whose positioning has been completed on the second pole piece positioning platform with its second suction surface, and can further rotate and transport it to a preset thermo-combining position.

[0026] As a further improvement of the above technical solution, the first pole piece positioning platform and the second pole piece positioning platform both perform pole piece positioning by CCD detection positioning device, and the first pole piece positioning platform and the second pole piece positioning platform are both four-station rotary positioning platforms.

[0027] As a further improvement of the above technical solution, among the four stations of the first pole piece positioning platform and the second pole piece positioning platform, one station is provided with a pole piece pushing-up device, the pole piece pushing-up device on the first pole piece positioning platform is used to push the first pole piece upward and abut the first pole piece against the first suction surface on the first pole piece rotating table, and the pole piece pushing-up device on the second pole piece positioning platform is used to push the second pole piece upward and abut the second pole piece against the second suction surface on the second pole piece rotating table.

[0028] As a further improvement of the above technical proposal, Bucket , 2nd Bucket a first loading manipulator and a second loading manipulator, Bucket , 2nd Bucketare respectively used to place the first pole piece and the second pole piece, and the first loading manipulator is Bucket The second loading manipulator is used to transport the first pole piece to the first pole piece positioning platform, and the second loading manipulator is used to transport the first pole piece to the first pole piece positioning platform. Bucket It is used to transport the second pole piece in the second pole piece positioning platform.

[0029] As a further improvement of the above technical solution, the thermocompression bonding apparatus includes a first thermocompression bonding apparatus and a second thermocompression bonding apparatus, the first thermocompression bonding apparatus is used for thermocompression bonding a first pole piece to a first surface of a separator, and the second thermocompression bonding apparatus is used for thermocompression bonding a second pole piece to a second surface of a separator.

[0030] As a further improvement of the above technical solution, the first thermocompression composite device and the second thermocompression composite device both include a heating module and a compression module, the heating module is used to preheat the separator to soften the composite adhesive pre-applied on the separator, and the compression module is used to compress the first pole piece or the second pole piece onto the softened composite adhesive portion on the separator to hold the first pole piece or the second pole piece under pressure, thereby thermocompressing the first pole piece or the second pole piece to the separator.

[0031] As a further improvement of the above technical solution, there are multiple folding pins, and the multiple folding pins are arranged so that their positions are offset in height, and the orientations of two adjacent folding pins are opposite to each other and are used to press two adjacent preliminary folds in the separator. Effect of the Invention

[0032] The beneficial effects of the present invention are as follows: The present invention provides a thermal composite cell manufacturing method and system, which uses the thermal composite cell manufacturing method and system to manufacture cells by stacking cells, which has the advantages of good stacking precision, good stacking quality, and high stacking efficiency, which is easy to automate, has good stacking overlap, improves the safety performance of the cells, and can save process and implementation costs.

[0033] From the above, this kind of thermal composite cell manufacturing method and system solves the technical defects of the existing prior art, such as complicated process, low stacking efficiency, easy to cause stacking misalignment, poor safety, and high implementation cost. [Brief description of the drawings]

[0034] The invention will now be further described with reference to the drawings and examples.

[0035] [Figure 1] FIG. 2 is a schematic diagram showing a flow of a method for manufacturing a thermal composite cell according to the present invention. [Diagram 2] 1 is a flow chart showing the principle of a thermal composite cell manufacturing method according to the present invention. [Diagram 3] 1 is a schematic diagram showing the principle of a thermal composite cell manufacturing system according to the present invention. [Figure 4] FIG. 2 is a structural schematic diagram of a composite stack according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] In order to fully understand the objectives, features and effects of the present invention, the concept, specific structure and resulting technical effects of the present invention will be described clearly and completely with reference to the embodiments and drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments, and other embodiments obtained by those skilled in the art without creative labor according to the embodiments of the present invention are all within the scope of protection of the present invention. In addition, all the connection / connection relationships in the patent do not simply mean direct connection of components, but mean that a better connection structure can be configured by adding or reducing connection auxiliary devices according to the specific implementation situation. With reference to Figures 1, 2, 3 and 4, the technical features in the creation of the present invention can be combined with each other on the premise that they are not contradictory or conflict with each other.

[0037] Specifically, see Figures 1, 2, and 4. Step S1 of unwinding the separator 1 and unwinding the separator by a separator unwinding device 6; Step S2: thermocompression bonding the pole pieces, the first pole piece 11 being thermocompression bonded to the first surface of the separator 1, and the second pole piece 12 being thermocompression bonded to the second surface of the separator 1, the first pole piece 11 and the second pole piece 12 being thermocompression bonded to both side surfaces of the separator 1, respectively; Step S3 of folding the separator 1 and the pole pieces into a Z-shape, folding the separator 1 with the first pole piece 11 and the second pole piece 12 thermocompression-bonded together by a Z-folding method, and stacking the first pole piece 11 and the second pole piece 12 alternately to form a composite stack 10; and step S4 of crimping the cells and crimping the Z-folded composite stack 10 into a cellular product; After completing step S2, the first pole piece 11 and the second pole piece 12 are distributed on both sides of the separator 1 with offset positions along the vertical direction.

[0038] In step S3, the separator 1, in which the first pole piece 11 and the second pole piece 12 are thermocompression-bonded together, is folded alternately into a Z shape by a plurality of folding pins 7, with the separator 1 being between the first pole piece 11 and the second pole piece 12. After the folding is completed, in step S4, the composite stack 10, which is alternately folded into a Z shape, is crimped by a crimping device to become a cell product.

[0039] In step S2, the first pole piece 11 is thermocompression bonded to the first surface of the separator 1 by the first thermocompression bonding device 21, and the second pole piece 12 is thermocompression bonded to the second surface of the separator 1 by the second thermocompression bonding device 22. The first thermocompression bonding device 21 and the second thermocompression bonding device 22 each have a preheating and compression bonding function, and the thermocompression bonding work of the first pole piece 11 and the second pole piece 12 is completed by the preheating and compression bonding function, and the separator 1 is a composite adhesive. In the process of thermocompression bonding the first pole piece 11 and the second pole piece 12 together, the separator 1 to which the composite adhesive has already been applied is first preheated, and then the composite adhesive on the separator 1 is softened by a preheating operation. The first pole piece 11 and the second pole piece 12 are then pressed to corresponding positions on the separator 1 and held under pressure, and the first pole piece 11 and the second pole piece 12 are bonded to corresponding positions on both side surfaces of the separator 1 by the softened composite adhesive.

[0040] Before the first pole piece 11 and the second pole piece 12 are thermocompression bonded to the separator 1, the first pole piece 11 is transported to the side of the first surface of the separator 1 by the first pole piece rotating table 31, and the second pole piece 12 is transported to the side of the second surface of the separator 1 by the second pole piece rotating table 32. After the first pole piece 11 and the second pole piece 12 reach a predetermined position, the first pole piece 11 and the second pole piece 12 are thermocompression bonded to the two side surfaces of the separator, and the first pole piece rotating table 31 rotates at least The second pole piece rotating table 32 also has one first adsorption surface 311, which rotates and conveys the first pole piece 11 to a preset thermo-compression bonding position, and the second pole piece rotating table 32 has at least one second adsorption surface 321, which rotates and conveys the second pole piece 12 to a preset thermo-compression bonding position, and in this embodiment, the first adsorption surface 311 and the second adsorption surface 321 both adsorb and fix the pole piece by negative pressure adsorption. In this embodiment, the first pole piece rotating table 31 has eight first adsorption surfaces 311, and the first pole piece rotating table 31 is provided with eight independent negative pressure control devices each corresponding to the first adsorption surface 311, and the second pole piece rotating table 32 has eight second adsorption surfaces 321, and the second pole piece rotating table 32 is provided with eight independent negative pressure control devices each corresponding to the second adsorption surface 321. In other embodiments, the number of first adsorption surfaces 311 provided on the first pole piece rotating table 31 and the number of second adsorption surfaces 321 provided on the second pole piece rotating table 32 may be selected as an appropriate number, for example, six, five, etc., according to specific implementation conditions.

[0041] Before the first pole piece rotating table 31 conveys the first pole piece 11 by the first suction surface 311, the first pole piece 11 is loaded onto the first pole piece 11 by the first loading manipulator. Bucket41 to the first pole piece positioning platform 51, and the first pole piece positioning platform 51 performs pole piece positioning for the first pole piece 11. After the positioning of the first pole piece 11 is completed on the first pole piece positioning platform 51, the first pole piece positioning platform 51 transports the first pole piece 11 to a station corresponding to the first suction surface 311, and further pushes the first pole piece 11 up to a predetermined position, and the first pole piece 11 pushed up to the predetermined position is suction-fixed to the first suction surface 311, and before the second pole piece rotating table 32 transports the second pole piece 12 by the second suction surface 321, the second loading manipulator transports the second pole piece 12 to the second Bucket 42 to the second pole piece positioning platform 52, which performs pole positioning for the second pole piece 12, and after the positioning of the second pole piece 12 is completed on the second pole piece positioning platform 52, the second pole piece positioning platform 52 transports the second pole piece 12 to a station corresponding to the second suction surface 321, and further pushes the second pole piece 12 up to a predetermined position, and the second pole piece 12 pushed up to the predetermined position is adsorbed and fixed to the second suction surface 321.

[0042] Said first pole piece positioning platform 51 and second pole piece positioning platform 52 both position the pole pieces by CCD detection positioning device, and said first pole piece positioning platform 51 and second pole piece positioning platform 52 both are four-station rotary positioning platforms.

[0043] Before loading the separator 1 into the separator unwinding device 6, a pre-folding operation is performed on the separator 1 so that the separator 1 has pre-folds, which are alternately provided on two sides of the separator 1 to form Z-shaped pre-folds, and the pitch between two adjacent pre-folds on the separator 1 matches the width dimensions of the first pole piece 11 and the second pole piece 12.

[0044] In a specific embodiment of the present invention, a preliminary fold is provided in the separator 1 in advance, and the separator 1 with the preliminary fold is unwound by the separator unwinding device 6, and then the separator 1 is fed to the first thermocompression bonding composite device 6. 2 When the first pole piece 11 reaches the matching position, the first pole piece rotating table 31 transports the first pole piece 11 to the matching position, and the first thermocompression bonding composite device 2 1 thermocompression bonds the first pole piece 11 to a predetermined position on the separator 1, then the second pole piece turntable 32 transports the second pole piece 12 to a matching position, and the second thermocompression bonding device 22 thermocompresses the second pole piece 12 to a corresponding position on the separator 1, so that the first pole piece 11 and the second pole piece 12 are offset from each other on both sides of the separator 1, and there is a preliminary fold in the middle of the separator 1 between the first pole piece 11 and the second pole piece 12. Then, with the assistance of the folding pins 7, the separator with the first pole piece 11 and the second pole piece 12 combined is stacked into a composite stack 10 by a Z-folding method, and finally, the composite stack 10 is crimped by a crimping device to form a cell product.

[0045] In this embodiment, the first pole piece 11 is a positive pole piece, and the second pole piece 12 is a negative pole piece.

[0046] Specifically, referring to Figs. 3 and 4, the present invention relates to a separator unwinding device 6 for unwinding the separator 1; a pole piece conveying device for conveying the first pole piece 11 and the second pole piece 12 to preset positions on both sides of the separator 1; a thermocompression bonding device for thermocompression bonding the first pole piece 11 and the second pole piece 12, which have been transported to a predetermined position by a pole piece transport device, to the first surface and the second surface of the separator 1, respectively, so that after the first pole piece 11 and the second pole piece 12 have been thermocompression bonded to the first surface and the second surface of the separator 1, the first pole piece 11 and the second pole piece 12 are distributed on both side surfaces of the separator 1 with their positions shifted along the vertical direction; A folding pin 7 for pushing the separator 1 along a preset preliminary fold line, and folding the separator 1, in which the first pole piece 11 and the second pole piece 12 are thermocompression-bonded, into a Z-shape; and a crimping device for crimping the Z-folded composite stack 10 into a cellular product. A thermal compound cell manufacturing system is further provided.

[0047] The pole piece transport device includes a first pole piece rotating table 31 and a second pole piece rotating table 32, which are respectively provided on both sides of the separator 1 and are provided so as to be offset in position, the first pole piece rotating table 31 has a first adsorption surface 311 for adsorbing the first pole piece 11, the first pole piece rotating table 31 adsorbs the first pole piece 11 by its first adsorption surface 311, and rotates and transports the first pole piece 11 to a thermo-compression bonding position corresponding to the side of the first surface of the separator 1 in a rotational manner, and the second pole piece rotating table 32 has a second adsorption surface 321 for adsorbing the second pole piece 12, the second pole piece rotating table 32 adsorbs the second pole piece 12 by its second adsorption surface 321, and rotates and transports the second pole piece 12 to a thermo-compression bonding position corresponding to the side of the second surface of the separator 1 in a rotational manner. The first and second adsorption surfaces 311 and 321 are both vacuum adsorption surfaces, and each of the first and second adsorption surfaces 311 and 321 has a plurality of vacuum adsorption holes distributed thereon. In this embodiment, the first pole piece rotating base 31 has eight first adsorption surfaces 311, and the first pole piece rotating base 31 The second pole piece rotating base 32 has eight second adsorption surfaces 321, and the second pole piece rotating base 32 has eight negative pressure control devices each of which is individually controllable and corresponds to the eight first adsorption surfaces 311. 321 There are eight negative pressure control devices corresponding to the above.

[0048] The pole piece further includes a first pole piece positioning platform 51 associated with the first pole piece rotating table 31 and a second pole piece positioning platform 52 associated with the second pole piece rotating table 32, the first pole piece positioning platform 51 is used to position the first pole piece 11, and the second pole piece positioning platform 52 is used to position the second pole piece 12, the first pole piece rotating table 31 can adsorb the first pole piece 11 whose positioning has been completed on the first pole piece positioning platform 51 with its first suction surface 311, and can further rotate and transport it to a preset thermo-compression bonding position, and the second pole piece rotating table 32 can adsorb the second pole piece 12 whose positioning has been completed on the second pole piece positioning platform 52 with its second suction surface 321, and can further rotate and transport it to a preset thermo-compression bonding position.

[0049] The first pole piece positioning platform 51 and the second pole piece positioning platform 52 both use a CCD detection positioning device to position the pole pieces. The first pole piece positioning platform 51 and the second pole piece positioning platform 52 are both four-station rotating positioning platforms. Of the four stations of the first pole piece positioning platform 51 and the second pole piece positioning platform 52, one station is provided with a pole piece thrusting device 501. The pole piece thrusting device 501 on the first pole piece positioning platform 51 is used to thrust the first pole piece 11 upward and abut the first pole piece 11 against the first suction surface 311 on the first pole piece rotating table 31. The pole piece thrusting device 501 on the second pole piece positioning platform 52 is used to thrust the second pole piece 12 upward and abut the second pole piece 12 against the second suction surface 321 on the second pole piece rotating table 32.

[0050] The thermal composite cell manufacturing system includes a first Bucket 41, No. 2 Bucket 42, a first loading manipulator, and a second loading manipulator, Bucket 41, No. 2 Bucket42 are used to mount the first pole piece 11 and the second pole piece 12, respectively, and the first loading manipulator is Bucket 41 to the first pole piece positioning platform 51, and the second loading manipulator is used to transport the first pole piece 11 in the Bucket It is used to transport the second pole piece 12 in 42 to the second pole piece positioning platform 52 .

[0051] The thermocompression bonding apparatus includes a first thermocompression bonding apparatus 21 and a second thermocompression bonding apparatus 22, the first thermocompression bonding apparatus 21 being used for thermocompression bonding the first pole piece 11 to the first surface of the separator 1, and the second thermocompression bonding apparatus 22 being used for thermocompression bonding the second pole piece 12 to the second surface of the separator 1, the first thermocompression bonding apparatus 21 and the second thermocompression bonding apparatus 22 both having a heating module and a compression module, the heating module being used for preheating the separator 1 to soften the composite adhesive pre-applied to the separator 1, and the compression module being used for pressing the first pole piece 11 or the second pole piece 12 against the portion of the softened composite adhesive on the separator 1 to hold the first pole piece 11 or the second pole piece 12 under pressure, thereby thermocompression bonding the first pole piece 11 or the second pole piece 12 to the separator 1.

[0052] There are multiple folding pins 7, and the multiple folding pins 7 are arranged so that their positions are shifted in height, and the orientation of two adjacent folding pins 7 is opposite, and they are used to push two adjacent preliminary folds in the separator 1.

[0053] Although the preferred embodiments of the present invention have been described in detail above, the invention is not limited to the above embodiments. Those skilled in the art may make various equivalent modifications or substitutions without departing from the spirit of the present invention, and all such equivalent modifications or substitutions are included in the scope of the claims of this application.

Claims

1. Step S1 of unwinding a separator (1) and unwinding the separator by a separator unwinding device (6); Step S2 of thermocompression bonding the pole pieces, a first pole piece (11) being thermocompression bonded to a first surface of the separator (1) and a second pole piece (12) being thermocompression bonded to a second surface of the separator (1), the first pole piece (11) and the second pole piece (12) being pole pieces of opposite polarity, and being thermocompression bonded to both side surfaces of the separator (1), respectively; Step S3 of folding the separator (1) and the pole pieces into a Z-shape, folding the separator (1) with the first pole piece (11) and the second pole piece (12) thermocompression-bonded together by a Z-folding method, and stacking the first pole piece (11) and the second pole piece (12) alternately to form a composite stack (10); and step S4 of crimping the cells and crimping the Z-folded composite stack (10) into a cellular product; In step S2, the first pole piece (11) is thermocompression bonded to the first surface of the separator (1) by the first thermocompression bonding device (21), and the second pole piece (12) is thermocompression bonded to the second surface of the separator (1) by the second thermocompression bonding device (22). Both the first thermocompression bonding device (21) and the second thermocompression bonding device (22) have preheating and compression functions, and the thermocompression bonding operation of the first pole piece (11) and the second pole piece (12) is completed by the preheating and compression functions. A method for manufacturing a thermal composite cell.

2. Before the first pole piece (11) and the second pole piece (12) are bonded to the separator (1) by thermocompression bonding, the first pole piece (11) is transported to the side of the first surface of the separator (1) by the first pole piece rotating table (31), and the second pole piece (12) is transported to the side of the second surface of the separator (1) by the second pole piece rotating table (32). After the first pole piece (11) and the second pole piece (12) reach predetermined positions, the first pole piece (11) and the second pole piece (12) are bonded to the two side surfaces of the separator (1) by thermocompression bonding.

2. The method for manufacturing a thermal composite cell according to claim 1.

3. The first pole piece rotating table (31) has at least one first attraction surface (311), and the first pole piece (11) is rotated and conveyed to a preset thermocompression bonding position by the first attraction surface (311), and the second pole piece rotating table (32) has at least one second attraction surface (321), and the second pole piece (12) is rotated and conveyed to a preset thermocompression bonding position by the second attraction surface (321).

3. The method for manufacturing a thermal composite cell according to claim 2.

4. The first and second adsorption surfaces (311, 321) are adapted to adsorb and fix the pole pieces by negative pressure adsorption.

4. The method for manufacturing a thermal composite cell according to claim 3.

5. The first pole piece rotating base (31) has eight first adsorption surfaces (311), and eight independent negative pressure control devices are provided in the first pole piece rotating base (31), each corresponding to one of the first adsorption surfaces (311); the second pole piece rotating base (32) has eight second adsorption surfaces (321), and eight independent negative pressure control devices are provided in the second pole piece rotating base (32), each corresponding to one of the second adsorption surfaces (321); 4. The method for manufacturing a thermal composite cell according to claim 3.

6. Before the first pole piece rotating table (31) transports the first pole piece (11) by the first suction surface (311), the first loading manipulator transports the first pole piece (11) from the first bucket (41) to the first pole piece positioning platform (51), and the first pole piece positioning platform (51) performs pole piece positioning for the first pole piece (11). After the positioning of the first pole piece (11) is completed on the first pole piece positioning platform (51), the first pole piece positioning platform (51) transports the first pole piece (11) to a station corresponding to the first suction surface (311), and further pushes the first pole piece (11) up to a predetermined position, and the first pole piece (11) pushed up to the predetermined position is suctioned and fixed to the first suction surface (311); Before the second pole piece rotating table (32) transports the second pole piece (12) by the second suction surface (321), the second loading manipulator transports the second pole piece (12) from the second bucket (42) to the second pole piece positioning platform (52), and the second pole piece positioning platform (52) performs pole piece positioning for the second pole piece (12). After the positioning of the second pole piece (12) is completed on the second pole piece positioning platform (52), the second pole piece positioning platform (52) transports the second pole piece (12) to a station corresponding to the second suction surface (321), and further pushes the second pole piece (12) up to a predetermined position, and the second pole piece (12) pushed up to the predetermined position is suctioned and fixed to the second suction surface (321).

4. The method for manufacturing a thermal composite cell according to claim 3.

7. The first pole piece positioning platform (51) and the second pole piece positioning platform (52) both position the pole piece by a CCD detection positioning device, and the first pole piece positioning platform (51) and the second pole piece positioning platform (52) both are four-station rotary positioning platforms; 7. A method for manufacturing a thermal composite cell according to claim 6.

8. After completing step S2, the first pole piece (11) and the second pole piece (12) are distributed on both sides of the separator (1) with offset positions along the longitudinal direction.

2. The method for manufacturing a thermal composite cell according to claim 1.

9. The separator (1) is a separator to which a composite adhesive has been applied in advance, and in the process of thermocompression bonding the first pole piece (11) and the second pole piece (12), the separator (1) to which the composite adhesive has been applied in advance is preheated, and then the composite adhesive in the separator (1) is softened by a preheating operation, and the first pole piece (11) and the second pole piece (12) are further pressure-bonded to corresponding positions on the separator (1) and kept under pressure, and the first pole piece (11) and the second pole piece (12) are bonded to corresponding positions on both side surfaces of the separator (1) by the softened composite adhesive.

2. The method for manufacturing a thermal composite cell according to claim 1.

10. Before loading the separator (1) into the separator unwinding device (6), a pre-folding operation is performed on the separator (1) so that the separator (1) has pre-folds, the pre-folds are alternately provided on two sides of the separator (1) to form Z-shaped pre-folds, and the pitch between two adjacent pre-folds on the separator (1) matches the width dimensions of the first pole piece (11) and the second pole piece (12); 2. The method for manufacturing a thermal composite cell according to claim 1.

11. In step S3, the separator (1) in which the first pole piece (11) and the second pole piece (12) are thermocompression-bonded is folded alternately into a Z-shape by a plurality of folding pins (7), and the separator (1) is between the first pole piece (11) and the second pole piece (12). After the folding is completed, in step S4, the composite stack (10) folded alternately into a Z-shape is crimped by a crimping device to become a cell product.

2. The method for manufacturing a thermal composite cell according to claim 1.

12. a separator unwinding device (6) for unwinding the separator (1); a pole piece conveying device for conveying the first pole piece (11) and the second pole piece (12) to preset positions on both sides of the separator (1); a thermocompression bonding device for thermocompression bonding the first pole piece (11) and the second pole piece (12) transported to a predetermined position by the pole piece transport device to the first surface and the second surface of the separator (1), respectively, so that after the first pole piece (11) and the second pole piece (12) have been thermocompression bonded to the first surface and the second surface of the separator (1), the first pole piece (11) and the second pole piece (12) are distributed on both side surfaces of the separator (1) with their positions shifted along the vertical direction; a folding pin (7) for pushing the separator (1) along a preset preliminary fold line to fold the separator (1) having the first pole piece (11) and the second pole piece (12) thermocompression-bonded thereto into a Z-shape; a crimping device for crimping the Z-folded composite stack (10) into a cellular product; The thermocompression bonding apparatus includes a first thermocompression bonding apparatus (21) and a second thermocompression bonding apparatus (22), the first thermocompression bonding apparatus (21) is used to thermocompression bond a first pole piece (11) to a first surface of a separator (1), and the second thermocompression bonding apparatus (22) is used to thermocompression bond a second pole piece (12) to a second surface of the separator (1); The first thermocompression composite device (21) and the second thermocompression composite device (22) each include a heating module and a compression module, the heating module is used to preheat the separator (1) to soften the composite adhesive pre-applied on the separator (1), and the compression module is used to press the first pole piece (11) or the second pole piece (12) against the portion of the separator (1) where the composite adhesive has been softened, thereby holding the first pole piece (11) or the second pole piece (12) under pressure, thereby thermocompressing the first pole piece (11) or the second pole piece (12) to the separator (1). A thermal composite cell manufacturing system.

13. The pole piece transport device includes a first pole piece rotating table (31) and a second pole piece rotating table (32), the first pole piece rotating table (31) and the second pole piece rotating table (32) are respectively provided on both sides of the separator (1) and are provided so as to be offset in position, the first pole piece rotating table (31) has a first adsorption surface (311) for adsorbing the first pole piece (11), and the first pole piece rotating table (31) adsorbs the first pole piece (11) by its first adsorption surface (311). the first pole piece (11) is attached to the first surface of the separator (1) by a rotational method, and the first pole piece (11) is rotated and conveyed to a thermocompression bonding position corresponding to a side portion of the first surface of the separator (1) by a rotational method; the second pole piece turntable (32) has a second adsorption surface (321) for adsorbing the second pole piece (12), the second pole piece turntable (32) adsorbs the second pole piece (12) by the second adsorption surface (321), and the second pole piece (12) is rotated and conveyed to a thermocompression bonding position corresponding to a side portion of the second surface of the separator (1) by a rotational method; The thermal composite cell manufacturing system of claim 12 .

14. The first pole piece rotating table (31) has eight first adsorption surfaces (311), and there are eight negative pressure control devices inside the first pole piece rotating table (31), which are individually controllable and correspond to the eight first adsorption surfaces (311), respectively; the second pole piece rotating table (32) has eight second adsorption surfaces (321), and there are eight negative pressure control devices inside the second pole piece rotating table (32), which are individually controllable and correspond to the eight second adsorption surfaces (321); 14. The thermal composite cell manufacturing system of claim 13.

15. The first suction surface (311) and the second suction surface (321) are both vacuum suction surfaces, and each of the first suction surface (311) and the second suction surface (321) has a plurality of vacuum suction holes distributed thereon.

14. The thermal composite cell manufacturing system of claim 13.

16. The pole piece further includes a first pole piece positioning platform (51) associated with the first pole piece rotating table (31) and a second pole piece positioning platform (52) associated with the second pole piece rotating table (32), the first pole piece positioning platform (51) is used to position the first pole piece (11), the second pole piece positioning platform (52) is used to position the second pole piece (12), the first pole piece rotating table (31) can adsorb the first pole piece (11) whose positioning has been completed on the first pole piece positioning platform (51) by its first adsorption surface (311) and can further rotate and transport it to a preset thermo-compression bonding position, and the second pole piece rotating table (32) can adsorb the second pole piece (12) whose positioning has been completed on the second pole piece positioning platform (52) by its second adsorption surface (321) and can further rotate and transport it to a preset thermo-compression bonding position.

14. The thermal composite cell manufacturing system of claim 13.

17. The first pole piece positioning platform (51) and the second pole piece positioning platform (52) both perform pole piece positioning by a CCD detection positioning device, and the first pole piece positioning platform (51) and the second pole piece positioning platform (52) are both four-station rotary positioning platforms; 17. The thermal composite cell manufacturing system of claim 16.

18. Among the four stations of the first pole piece positioning platform (51) and the second pole piece positioning platform (52), one station is provided with a pole piece pushing-up device (501), the pole piece pushing-up device (501) on the first pole piece positioning platform (51) is used to push up the first pole piece (11) and make the first pole piece (11) abut against the first attraction surface (311) on the first pole piece rotating table (31), and the pole piece pushing-up device (501) on the second pole piece positioning platform (52) is used to push up the second pole piece (12) and make the second pole piece (12) abut against the second attraction surface (321) on the second pole piece rotating table (32); 20. The thermal composite cell manufacturing system of claim 17.

19. The machine further comprises a first bucket (41), a second bucket (42), a first loading manipulator, and a second loading manipulator, the first bucket (41) and the second bucket (42) are respectively used for loading a first pole piece (11) and a second pole piece (12), the first loading manipulator is used for transporting the first pole piece (11) in the first bucket (41) to a first pole piece positioning platform (51), and the second loading manipulator is used for transporting the second pole piece (12) in the second bucket (42) to a second pole piece positioning platform (52); 17. The thermal composite cell manufacturing system of claim 16.

20. The folding pins (7) are provided in a plurality, and the plurality of folding pins (7) are arranged so as to be offset from one another, so that the orientation of two adjacent folding pins (7) is opposite, and the folding pins (7) are used to push two adjacent preliminary folds in the separator (1). The thermal composite cell manufacturing system of claim 12 .

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