Cell stacking equipment

Abstract

This invention relates to a battery cell stacking apparatus, including a stacking mechanism, a first feeding mechanism, and a second feeding mechanism. The stacking mechanism includes a stacking table, a first pressing blade, and a second pressing blade. During the stacking operation, the first pressing blade is in an open state while the second pressing blade is in a clamping state. After the first feeding mechanism inserts the provided first wafer between the first pressing blade and the stacking table, the first pressing blade switches to the clamping state while the second pressing blade switches to the open state. Then, after the second feeding mechanism inserts the provided second wafer between the second pressing blade and the stacking table, the second pressing blade switches to the clamping state while the first pressing blade switches to the open state. This process is repeated to complete the stacking of the battery cells. Therefore, when using the above-described battery cell stacking apparatus to manufacture battery cells, it is unnecessary to use a robotic arm to reciprocate and grasp the positive electrode, negative electrode, and separator. Thus, the above-described battery cell stacking apparatus can significantly improve the efficiency of battery cell production.

Description

Technical Field

[0001] This invention relates to the field of lithium battery equipment technology, and in particular to a cell stacking device. Background Technology

[0002] Lithium-ion battery cells are typically manufactured using two processes: lamination and winding. Because lamination offers certain advantages over winding, it is increasingly being used to form battery cells. In traditional lamination, a lamination robot is used to alternately place a predetermined number of positive electrode sheets, negative electrode sheets, and separators onto a lamination table to stack them into a cell, which is then hot-pressed. However, this traditional lamination process has low efficiency and cannot meet production capacity demands. Summary of the Invention

[0003] Therefore, it is necessary to provide a cell stacking device that can improve cell production efficiency in response to the above problems.

[0004] A battery cell stacking device, comprising:

[0005] The stacking mechanism includes a stacking table, a first pressing knife, and a second pressing knife, both of which can switch between an open state and a pressed state.

[0006] The first feeding mechanism, when the first pressing knife is in the open state and the second pressing knife is in the clamping state, is capable of inserting the first sheet material between the first pressing knife and the stacking table; and

[0007] The second feeding mechanism can insert the second sheet material between the second pressing knife and the stacking table when the first pressing knife is in the pressed state and the second pressing knife is in the open state.

[0008] The first feeding mechanism and the second feeding mechanism are capable of alternately supplying the first sheet material and the second sheet material to the stacking table to stack them into a battery cell on the stacking table.

[0009] In one embodiment, the first and second pressure knives are rotatable about a pivot to switch between an open state and a clamping state.

[0010] In one embodiment, the first feeding mechanism includes:

[0011] The first unwinding mechanism is used to unwind the first electrode strip.

[0012] A slicing mechanism is used to sequentially cut the first electrode strip into multiple first electrode sheets;

[0013] Two diaphragm unwinding mechanisms are used to unwind diaphragm strips on both sides of the first electrode sheet;

[0014] A composite mechanism is used to receive the first electrode sheet material and the diaphragm material tape, and to composite the diaphragm material tape with the first electrode sheet material to obtain a composite material tape.

[0015] The first cutting and feeding mechanism is used to cut the composite strip into multiple first sheets in sequence, and to insert the first sheets in sequence between the first pressure knife and the stacking table, wherein each first sheet includes a first electrode sheet.

[0016] In one embodiment, the first feeding mechanism includes:

[0017] The first unwinding mechanism is used to unwind the first electrode strip.

[0018] Two diaphragm unwinding mechanisms are used to unwind the diaphragm strip on both sides of the first electrode strip;

[0019] A composite mechanism is used to receive the first electrode strip and the diaphragm strip, and to combine the diaphragm strip with the first electrode strip to obtain a composite strip.

[0020] The first cutting and feeding mechanism is used to cut the composite strip into multiple first sheets in sequence, and to insert the first sheets in sequence between the first pressure knife and the stacking table. Each first sheet includes a first electrode sheet cut from the first electrode strip.

[0021] In one embodiment, the composite mechanism includes two opposing pressure rollers, through which the first electrode sheet and the diaphragm strip can pass and be pressed together, and at least one of the pressure rollers is provided with a heating component to heat the first electrode sheet and the diaphragm strip.

[0022] In one embodiment, the first feeding mechanism further includes a feeding clamping roller disposed between the slicing mechanism and the composite mechanism, wherein the first electrode sheet material cut by the slicing mechanism and the diaphragm strip located on both sides of the first electrode sheet material can be clamped by the feeding clamping roller and fed into the composite mechanism.

[0023] In one embodiment, the second feeding mechanism includes:

[0024] The second unwinding mechanism is used to unwind the second electrode strip.

[0025] The second cutting and feeding mechanism is used to cut the second electrode strip into multiple second electrode sheets as the second sheet material, and to insert the second electrode sheets into the second pressing knife and the stacking table in sequence.

[0026] In one embodiment, the stacking mechanism further includes a circulation component that can drive the stacking table to circulate along the path of the stacking station, the adhesive application station, the unloading station, and the stacking station.

[0027] In one embodiment, the circulation assembly is provided with a plurality of stacking tables, and the first pressing knife and the second pressing knife are respectively installed on opposite sides of each stacking table. When one of the stacking tables enters the stacking station under the drive of the circulation assembly, the other two stacking tables enter the adhesive application station and the unloading station respectively.

[0028] In one embodiment, the circulation component is a turret, and a plurality of stacking platforms are arranged at equal intervals along the circumference of the turret.

[0029] In the aforementioned cell stacking equipment, one of the first and second wafers includes a positive electrode sheet, and the other includes a negative electrode sheet. During the stacking operation, the first pressure knife is in the open state, while the second pressure knife is in the clamping state. After the first feeding mechanism inserts the supplied first wafer sheet between the first pressure knife and the stacking table, the first pressure knife switches to the clamping state, and the second pressure knife switches to the open state. Then, after the second feeding mechanism inserts the supplied second wafer sheet between the second pressure knife and the stacking table, the second pressure knife switches to the clamping state, and the first pressure knife switches to the open state. This process is repeated to complete the cell stacking. Therefore, when manufacturing cells using the aforementioned cell stacking equipment, it is unnecessary to use a robotic arm to reciprocate and grasp the positive electrode sheet, negative electrode sheet, and separator. Thus, the aforementioned cell stacking equipment can significantly improve the efficiency of cell production. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a cell stacking device in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a cell stacking device in another embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the stacked structure of the first sheet material in one embodiment of the present invention;

[0034] Figure 4 for Figure 1 The diagram shows a stacked structure of battery cells produced by the battery cell stacking equipment. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] Please see Figure 1 In one embodiment of the present invention, the cell stacking device 100 includes a stacking mechanism 110, a first feeding mechanism 120 and a second feeding mechanism 130.

[0042] The stacking mechanism 110 includes a stacking table 111, a first pressing blade 112, and a second pressing blade 113. The stacking table 111 is generally a plate-shaped structure formed from a material with high mechanical strength, such as metal, and can be rectangular, with a bearing surface. The electrodes and separators used for cell stacking can be supported on the bearing surface. The electrodes and separators are stacked on the stacking table 110 to produce a cell.

[0043] The first pressing blade 112 and the second pressing blade 113 are located on opposite sides of the stacking table 111, as follows: Figure 1 The left and right sides are shown. Both the first pressing knife 112 and the second pressing knife 113 have an open state and a pressed state. In the pressed state, the first pressing knife 112 and the second pressing knife 113 can press materials such as electrode sheets and diaphragms onto the bearing surface of the stacking table 111. In the open state, the first pressing knife 112 and the second pressing knife 113 can form a gap with the bearing surface of the stacking table 111. The states of the first pressing knife 112 and the second pressing knife 113 can be switched independently; that is, when the first pressing knife 112 is in the open state, the second pressing knife 113 can switch to the pressed state; and when the second pressing knife 113 is in the open state, the first pressing knife 112 can switch to the pressed state.

[0044] Specifically, in this embodiment, the first pressing blade 112 and the second pressing blade 113 are rotatable around a pivot axis to switch between an open state and a clamping state. When the first pressing blade 112 and the second pressing blade 113 rotate toward the bearing surface of the stacking table 111, they can switch from the open state to the clamping state; conversely, when they rotate away from the bearing surface of the stacking table 111, they can switch from the clamping state to the open state. Thus, the first pressing blade 112 and the second pressing blade 113 have a faster response speed when state switching is required.

[0045] The first feeding mechanism 120 and the second feeding mechanism 130 are used to supply the first sheet 20 and the second sheet 30, respectively. One of the first sheet 20 and the second sheet 30 includes a positive electrode plate, and the other includes a negative electrode plate. Figure 3 As shown, specifically in this embodiment, the first sheet material 20 includes a first electrode sheet material 21 and a separator sheet material 22 attached to both sides of the first electrode sheet material 21, and the second sheet material 30 is a second electrode sheet material. Moreover, one of the first electrode sheet material 21 and the second electrode sheet material is a negative electrode sheet, and the other is a positive electrode sheet.

[0046] Obviously, in other embodiments, the first sheet 20 and the second sheet 30 can also be in other forms, as long as one of them includes a positive electrode sheet that constitutes the battery cell, and the other includes a negative electrode sheet.

[0047] For example, the first sheet 20 may include a negative electrode and a separator attached to one side of the negative electrode, while the second sheet 30 includes a positive electrode and another separator attached to one side of the positive electrode. Alternatively, the first sheet 20 and the second sheet 30 may have the same structure, and both are four-layer structures consisting of a positive electrode, a separator, a negative electrode, and a separator stacked in sequence.

[0048] The first feeding mechanism 120 and the second feeding mechanism 120 can alternately supply the first sheet 20 and the second sheet 20 to the stacking table 111 for cell stacking. In this way, a structure of alternating layers of positive electrode sheets, negative electrode sheets, and separators can be formed on the bearing surface of the stacking table 111, and ultimately stacked into a shape as shown. Figure 4 The battery cell shown. More specifically, in this embodiment, the first electrode sheet 21 is a negative electrode sheet, and the second electrode sheet is a positive electrode sheet.

[0049] During the stacking operation, the first pressing blade 112 switches to the open state while the second pressing blade 113 switches to the clamping state, forming a gap between the first pressing blade 112 and the stacking table 111 for inserting the first sheet material 20. The second pressing blade 113 then clamps the material already placed on the stacking table 111. The first feeding mechanism 120 inserts the supplied first sheet material 20 between the first pressing blade 112 and the stacking table 111. After the first sheet material 20 is inserted, the first pressing blade 112 switches to the clamping state while the second pressing blade 113 cuts... When switched to the open state, a gap is formed between the second pressing knife 113 and the stacking table 111 for the insertion of the second sheet material 30, while the first pressing knife 112 presses the material already placed on the stacking table 111; then, the second feeding mechanism 130 inserts the supplied second sheet material 30 between the second pressing knife 113 and the stacking table 111; after the second sheet material 20 is inserted, the first pressing knife 112 is switched to the open state again and the second pressing knife 113 is switched to the pressing state to prepare for the insertion of the next first sheet material 20.

[0050] Repeat the above process until the number of layers of the first sheet 20 and the second sheet 30 stacked on the stacking table 111 reaches the preset value, thus producing the product as shown above. Figure 4 The battery cell shown.

[0051] By alternately switching between the pressing state and the opening state of the first pressing blade 112 and the second pressing blade 113, the first sheet material 20 and the second sheet material 30 provided by the first feeding mechanism 120 and the second feeding mechanism 130 can be alternately placed on the stacking table 111 in an insert manner. Therefore, the stacking efficiency can be significantly improved.

[0052] In this embodiment, the first feeding mechanism 120 includes a first unwinding mechanism 121, a slicing mechanism 122, two diaphragm unwinding mechanisms 123, a composite mechanism 124, and a first cutting and feeding mechanism 125.

[0053] The first unwinding mechanism 121 is used to unwind the first electrode strip 40, and the slicing mechanism 122 is used to sequentially cut the first electrode strip 40 into multiple first electrode sheets 21. The multiple first electrode sheets 21 cut by the slicing mechanism 122 can sequentially enter the composite mechanism 124. Two diaphragm unwinding mechanisms 123 are used to unwind diaphragm strips 50 on both sides of the first electrode sheets 21. Moreover, the diaphragm strips 50 on both sides of the first electrode sheets 21 can enter the composite mechanism 124 together with the first electrode sheets 21. The composite mechanism 124 is used to receive the first electrode sheets 21 and the diaphragm strips 50, and to composite the diaphragm strips 50 with the first electrode sheets 21 to obtain a composite strip 60.

[0054] Specifically, in this embodiment, the composite mechanism 124 includes two opposing pressure rollers (not shown in the figure), through which the first electrode sheet 21 and the diaphragm strip 50 can pass and be pressed together. The clamping force provided by the rotation of the pressure rollers is more uniform, thus resulting in a better composite effect between the first electrode sheet 21 and the diaphragm strip 50.

[0055] Furthermore, in this embodiment, at least one pressure roller is provided with a heating component (not shown) to heat the first electrode sheet 21 and the diaphragm strip 50. The heating component can be an electric heating wire, a ceramic heating tube, etc. By heating the first electrode sheet 21 and the diaphragm strip 50, the composite effect can be further improved.

[0056] The first cutting and feeding mechanism 125 is used to sequentially cut the composite strip 60 into multiple first pieces 20, and insert the first pieces 20 sequentially between the first pressure knife 112 and the stacking table 111. The first cutting and feeding mechanism 125 includes two parts: a cutting component and a feeding component. The cutting component can cut the composite strip 60 to obtain the first pieces 20, and each first piece 20 includes a first electrode sheet 21. The feeding component can move the first pieces 20 toward the stacking table 111 by adsorption or clamping and realize the insertion. In this way, during the stacking process, there is no need to use a robotic arm to move back and forth to place the first pieces 20 on the stacking table 111.

[0057] Furthermore, specifically in this embodiment, the first feeding mechanism 120 also includes an infeed clamping roller 126 disposed between the slicing mechanism 122 and the composite mechanism 124. The first electrode sheet 21 cut by the slicing mechanism 122 and the diaphragm strip 50 located on both sides of the first electrode sheet 21 can be clamped by the infeed clamping roller 126 and fed into the composite mechanism 124. The infeed clamping roller 126 can clamp the first electrode sheet 21 and the diaphragm strip 50, thereby ensuring that the first electrode sheet 21 smoothly enters the composite mechanism 124 and maintains a high alignment accuracy between the first electrode sheet 21 and the diaphragm strip 50 entering the composite mechanism 124.

[0058] In other embodiments, the slicing mechanism 122 can be omitted, and the first electrode strip 40 unwound by the first unwinding mechanism 121 can be directly combined with the diaphragm strips 50 on both sides to obtain a composite strip 60. When the first cutting and feeding mechanism 125 cuts the composite strip 60, it can also cut the first electrode strip 40, thereby obtaining the first electrode sheet 21 contained in each first sheet 20.

[0059] In this embodiment, the second feeding mechanism 130 includes a second unwinding mechanism 131 and a second cutting and feeding mechanism 132.

[0060] The second unwinding mechanism 131 is used to unwind the second electrode strip 70. The second cutting and feeding mechanism 132 is used to sequentially cut the second electrode strip 70 into multiple second electrode sheets as second sheet materials 30, and to sequentially insert the second electrode sheets between the second pressure knife 113 and the stacking table 111. The second cutting and feeding mechanism 132 can have the same structure as the first cutting and feeding mechanism 125. Therefore, the second sheet materials 30 can also be directly inserted by the second cutting and feeding mechanism 132 without the need for a robotic arm to stack them.

[0061] It should be noted that in other embodiments, the first feeding mechanism 120 can directly insert the pre-cut and stored first sheet material 20 into the first pressing knife 112 and the stacking table 111 in sequence, and the second feeding mechanism 130 can also directly insert the pre-cut and stored first sheet material 20 into the second pressing knife 113 and the stacking table 111 in sequence.

[0062] Please refer to it again. Figure 1 In this embodiment, the stacking mechanism 110 further includes a circulation component 114, which can drive the stacking table 111 to circulate along the path of the stacking station, the adhesive application station, the unloading station and the stacking station.

[0063] When the stacking table 111 enters the stacking station, the first feeding mechanism 120 and the second feeding mechanism 130 can respectively provide the first sheet material 20 and the second sheet material 30 to the stacking table 111 until the battery cells are stacked. Then, driven by the circulation component 114, the stacking table 111 can sequentially enter the adhesive application station and the unloading station. After the battery cells on the stacking table 111 are adhesively applied at the adhesive application station, the battery cells can be unloaded at the unloading station. Finally, the stacking table 111 returns to the stacking station, where the next battery cell can be stacked.

[0064] After the cells are stacked, the stacking stage 111 can be moved by the circulation component 114 to transfer the cells to subsequent processes. In this way, no direct action is required on the cells during the transfer process, which helps to maintain the stability of the cells.

[0065] It should be pointed out that, such as Figure 2 As shown, in other embodiments, the stacking stage 111 can also be fixedly installed at the stacking station. In this case, when the battery cells are stacked and need to be transferred to subsequent processes, clamping devices can be used to hold the battery cells for transfer.

[0066] Furthermore, in this embodiment, the circulation component 114 is provided with a plurality of stacking tables 111. Each stacking table 111 has a first pressing knife 112 and a second pressing knife 113 installed on opposite sides. When one of the stacking tables 111 enters the stacking station under the drive of the circulation component 114, the other two stacking tables 111 enter the adhesive application station and the unloading station respectively.

[0067] As the stacking table 111 moves between workstations, its first pressing blade 112 and second pressing blade 113 can transfer accordingly, pressing the battery cells firmly onto the stacking table 111. When the stacking workstation is performing a stacking operation, the stacked battery cells can enter the adhesive application station with one of the stacking tables 111, where adhesive is applied. Simultaneously, the adhesive-applied battery cells can be transferred to the unloading station with another stacking table 111 for unloading. Therefore, with the cooperation of the circulating component 114 and multiple stacking tables 111, multiple processes can be performed simultaneously, further improving the production efficiency of the battery cell stacking equipment 100.

[0068] In other embodiments, the first pressing blade 112 and the second pressing blade 113 may always be located within the stacking station. When one of the stacking tables 111 is transferred to the stacking station, the first pressing blade 112 and the second pressing blade 113 are distributed on opposite sides of that stacking table 111. In this case, a clamping fixture for holding the battery cells needs to be provided on each stacking table 111 to prevent the stacked battery cells from scattering during the transfer process.

[0069] More specifically, three stacking stations 111 are provided, ensuring that stacking stations 111 can exist simultaneously in the three workstations mentioned above, and that no stacking station 111 is idle. In this way, the footprint of the cell stacking equipment 100 can be minimized while meeting efficiency requirements.

[0070] Specifically, in this embodiment, the circulation component 114 is a turret, and multiple stacking platforms 111 are equally spaced along the circumference of the turret. When the turret rotates, it drives the multiple stacking platforms 111 to circulate sequentially between the stacking station, the adhesive application station, and the unloading station. The stacking platforms 111 and the turret can be connected by a rotating shaft, so as the turret rotates, the bearing surface of each stacking platform 111 can always remain horizontal, thereby preventing the battery cells on it from slipping off.

[0071] It should be noted that in other embodiments, the circulation component 114 may also be a conveyor chain, conveyor belt, etc., capable of cyclic conveying.

[0072] In the aforementioned cell stacking equipment 100, one of the first wafer 20 and the second wafer 30 includes a positive electrode sheet, and the other includes a negative electrode sheet. During the stacking operation, the first pressing blade 112 is in the open state, while the second pressing blade 113 is in the clamping state. After the first feeding mechanism 120 inserts the provided first wafer 20 between the first pressing blade 112 and the stacking table 111, the first pressing blade 112 switches to the clamping state, and the second pressing blade 113 switches to the open state. Then, after the second feeding mechanism 130 inserts the provided second wafer 30 between the second pressing blade 113 and the stacking table 111, the second pressing blade 113 switches to the clamping state, and the first pressing blade 112 switches to the open state. This process is repeated to complete the cell stacking. Therefore, when manufacturing cells using the aforementioned cell stacking equipment 100, it is unnecessary to use a robotic arm to reciprocate and grasp the positive electrode sheet, negative electrode sheet, and separator. Thus, the aforementioned cell stacking equipment 100 can significantly improve the efficiency of cell production.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An electric cell stacking apparatus characterized by comprising: The application relates to a laminating mechanism, which comprises a laminating table, a first pressing knife and a second pressing knife, the first pressing knife and the second pressing knife can be switched between an open state and a pressing state; a first feeding mechanism, which can insert a first sheet into the first pressing knife and the laminating table when the first pressing knife is in the open state and the second pressing knife is in the pressing state; the first feeding mechanism comprises: a first unwinding mechanism for unwinding a first pole sheet strip; two diaphragm unwinding mechanisms for unwinding diaphragm strips; a composite mechanism for compounding the diaphragm strips and the first pole sheet strip to obtain a composite strip; a first cutting and sheet feeding mechanism for cutting the composite strip into a plurality of first sheets in sequence and inserting the first sheets into the first pressing knife and the laminating table in sequence; and a second feeding mechanism, which can insert a second sheet into the second pressing knife and the laminating table when the first pressing knife is in the pressing state and the second pressing knife is in the open state; the second feeding mechanism comprises: a second unwinding mechanism for unwinding a second pole sheet strip; a second cutting and sheet feeding mechanism for cutting the second pole sheet strip into a plurality of second pole sheet pieces as the second sheets and inserting the second pole sheet pieces into the second pressing knife and the laminating table in sequence; wherein the first feeding mechanism and the second feeding mechanism can alternately provide the first sheets and the second sheets to the laminating table to stack into an electric core on the laminating table. The first pressing knife and the second pressing knife can rotate around a rotating shaft to be switched between the open state and the pressing state. The first feeding mechanism further comprises a sheet cutting mechanism for cutting the first pole sheet strip into a plurality of first pole sheet pieces in sequence; and the composite mechanism is used for compounding the diaphragm strips and the plurality of first pole sheet pieces cut from the first pole sheet strip to obtain a composite strip. The composite mechanism comprises two oppositely arranged pressing rollers, the first pole sheet pieces and the diaphragm strips can pass between the two pressing rollers and be pressed, and at least one of the pressing rollers is provided with a heating assembly to heat the first pole sheet pieces and the diaphragm strips. The first feeding mechanism further comprises an inlet clamping roller arranged between the sheet cutting mechanism and the composite mechanism, the first pole sheet pieces cut by the sheet cutting mechanism and the diaphragm strips located on both sides of the first pole sheet pieces can be clamped by the inlet clamping roller and fed into the composite mechanism. The laminating mechanism further comprises a circulating assembly, which can drive the laminating table to circulate along a laminating station, a rubberizing station, a discharging station and a path of the laminating station. The circulating assembly is provided with a plurality of laminating tables, the first pressing knife and the second pressing knife are respectively arranged on opposite sides of each laminating table, and when one of the laminating tables enters the laminating station under the driving of the circulating assembly, the other two laminating tables enter the rubberizing station and the discharging station respectively. ​ ​ ​ ​ ​ 2. The cell stacking apparatus according to claim 1, characterized by, ​ 3. The cell stacking apparatus according to claim 1, characterized by, ​ 4. The cell stacking apparatus according to claim 3, characterized by, ​ 5. The cell stacking apparatus according to claim 3, characterized by, ​ 6. The cell stacking apparatus according to claim 1, characterized by, ​ 7. The cell stacking apparatus according to claim 6, characterized by, ​ 8. The cell stacking apparatus according to claim 7, characterized by, The circulating assembly is a turret, and a plurality of the lamination tables are arranged equidistantly along the circumference of the turret.

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