Laminating machine

Abstract

The utility model relates to a lamination machine. The lamination machine comprises a lamination table provided with a working area; the diaphragm conveying mechanism is located above the lamination table and reciprocates in the first direction relative to the lamination table so as to lay diaphragms to the working area of the lamination table; the two lamination assemblies are respectively arranged at the two end parts of the working area in the first direction, and the two lamination assemblies are respectively used for alternately pressing the diaphragms or the pole pieces in the working area; wherein at least one lamination assembly comprises at least two side edge pressing pieces and at least one auxiliary pressing piece, the at least two side edge pressing pieces are arranged at the two ends of the working area in the second direction respectively, the auxiliary pressing piece is arranged between the two ends of the working area in the second direction, and the second direction is perpendicular to the first direction and parallel to the working area of the lamination table. The lamination machine can effectively improve the wrinkling condition of the diaphragm so as to improve the quality of a battery cell finished product.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery manufacturing, in particular to a laminating machine. Background Art

[0002] The production process of lithium-ion battery cells generally includes a winding process and a stacking process. Among them, the stacked cells produced by the stacking process have the advantages of high capacity, low internal resistance, and various shapes, so they are widely used. The stacked cell is formed by stacking the diaphragm, the negative electrode plate, the diaphragm, and the positive electrode plate in sequence. The stacked cell is generally made by a stacking machine. During the production process, it is necessary to set a press knife to locate the position of the diaphragm and the electrode plate. However, in the stacking machine of the related art, the diaphragm often wrinkles during the stacking process of the electrode plate and the diaphragm, resulting in the unsatisfactory quality of the finished product of the stacked cell. Utility Model Content

[0003] Based on this, it is necessary to provide a stacking machine that can effectively improve the wrinkling of the diaphragm to improve the quality of the finished battery cells.

[0004] The laminating machine provided in the embodiment of the present application comprises:

[0005] Lamination table with work area;

[0006] A diaphragm conveying mechanism is located above the laminating table and reciprocates relative to the laminating table in a first direction to lay the diaphragm on the working area of ​​the laminating table; and

[0007] Two laminate assemblies are respectively arranged at two ends of the working area in the first direction, and the two laminate assemblies are respectively used to alternately press the diaphragm or the pole piece in the working area;

[0008] Among them, at least one lamination assembly includes at least two side pressing pieces and at least one auxiliary pressing piece, at least two side pressing pieces are respectively arranged at the two ends of the second direction of the working area, and the auxiliary pressing piece is arranged between the two ends of the second direction of the working area, and the second direction is perpendicular to the first direction and parallel to the working area of ​​the lamination table.

[0009] In one embodiment, each of the two lamination assemblies includes at least two side pressing members and at least one auxiliary pressing member.

[0010] In one embodiment, the number of auxiliary pressing members included in the same lamination assembly is more than two, and the more than two auxiliary pressing members are arranged at intervals along the first direction.

[0011] In one embodiment, the width of the pressing surface of the side pressing member along the second direction is 20 mm-30 mm.

[0012] In one embodiment, each lamination assembly includes a plurality of rotary cylinders, and each side pressing member and each auxiliary pressing member included in the same lamination assembly are each driven by a rotary cylinder.

[0013] In one embodiment, each lamination assembly further includes a mounting plate;

[0014] Each side pressing member is connected to the corresponding rotary cylinder via a mounting fixing plate;

[0015] Each auxiliary pressing member is connected to the corresponding rotary cylinder via a mounting fixing plate.

[0016] In one embodiment, the electrode sheet includes a positive electrode sheet and a negative electrode sheet; and the laminating machine further includes:

[0017] Two electrode sheet conveying mechanisms are respectively arranged on both sides of the lamination platform in the first direction, and the two electrode sheet conveying mechanisms are respectively used to alternately convey positive electrode sheets or negative electrode sheets to the working area of ​​the lamination platform; and

[0018] A controller, electrically connected to the electrode conveying mechanism and the diaphragm conveying mechanism;

[0019] The controller is used to control two electrode sheet conveying mechanisms and a diaphragm conveying mechanism to alternately stack diaphragms, negative electrode sheets and positive electrode sheets on a working area to form a laminated battery cell.

[0020] In one embodiment, the side pressing member and the auxiliary pressing member included in one of the laminate assemblies are defined as a first side pressing member and a first auxiliary pressing member, respectively, and the side pressing member and the auxiliary pressing member included in another laminate assembly are defined as a second side pressing member and a second auxiliary pressing member, respectively;

[0021] The controller is also used to control the first side pressing member and the first auxiliary pressing member to press the negative electrode sheets when stacking the negative electrode sheets, and to control the second side pressing member and the second auxiliary pressing member to press the positive electrode sheets when stacking the positive electrode sheets.

[0022] In one of the embodiments, the controller is further configured to extract the auxiliary pressing member located between two ends of the working area in the first direction when the diaphragm conveying mechanism reciprocates relative to the laminating table in the first direction to lay the diaphragm.

[0023] In one embodiment, the membrane conveying mechanism includes a plurality of swing rollers, the membrane is wound around the plurality of swing rollers, and the axis directions of the plurality of swing rollers are parallel to the second direction.

[0024] Beneficial effects of the above lamination machine:

[0025] At least one stacking assembly includes at least two side pressing pieces and at least one auxiliary pressing piece, at least two side pressing pieces are respectively arranged at the two ends of the second direction of the working area, and the auxiliary pressing piece is arranged between the two ends of the second direction of the working area. In this way, when the stacking assembly is pressed on the diaphragm or pole piece of the working area, the side pressing piece and the auxiliary pressing piece press the diaphragm or pole piece at the end and the middle of the second direction respectively. Compared with the situation of pressing only at one position in the related art, the pressing positions increase, the pressing force and the pressing area increase, and the wrinkling of the diaphragm is effectively improved. On the other hand, when the number of stacking layers is large, the middle part of the stacked battery cell is prone to arching. By setting an auxiliary pressing piece and pressing between the two ends of the second direction of the working area, the wrinkling of the diaphragm caused by the arching of the middle part can be greatly alleviated, and the quality of the finished battery cell can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a laminating machine provided in an embodiment of the present application;

[0027] Figure 2 A top view of the laminating machine provided in an embodiment of the present application.

[0028] Description of Figure Numbers:

[0029] 100. Lamination machine;

[0030] 10. Lamination table; 20. Diaphragm conveying mechanism; 21. Swinging roller; 22. Diaphragm; 30. Lamination assembly;

[0031] 40, side pressing piece; 41, first side pressing piece; 42, second side pressing piece; 50, auxiliary pressing piece; 51, first auxiliary pressing piece; 52, second auxiliary pressing piece; 60, rotating cylinder; 70, pole piece conveying mechanism; 80, pole piece; 81, positive pole piece; 82, negative pole piece;

[0032] Z, working area; F, first direction; S, second direction. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] The laminating machine 100 according to the embodiment of the present application will be described below with reference to the accompanying drawings.

[0040] Figure 1 A schematic diagram of the structure of a lamination machine provided in an embodiment of the present application, Figure 2 A top view of a laminating machine provided in an embodiment of the present application. Figure 2 In the figure, the diaphragm conveying mechanism 20 is omitted for ease of observation.

[0041] The stacking machine 100 in the present application is used for the production of stacked cells in stacked lithium-ion batteries. The stacked cells can be formed by alternately stacking negative electrode sheets 82, separators 22, and positive electrode sheets 81 in sequence.

[0042] Reference Figure 1 The laminating machine 100 provided in the embodiment of the present application includes a laminating table 10 , a diaphragm conveying mechanism 20 and two laminating assemblies 30 .

[0043] The lamination table 10 is provided with a working area Z. The diaphragm conveying mechanism 20 is located above the lamination table 10 and reciprocates along the first direction F relative to the lamination table 10 to lay the diaphragm 22 to the working area Z of the lamination table 10. Two lamination assemblies 30 are respectively provided at both ends of the working area Z in the first direction F, and the two lamination assemblies 30 are respectively used to alternately press the diaphragm 22 or the pole piece 80 in the working area Z. Exemplarily, the pole piece 80 may include a positive pole piece 81 and a negative pole piece 82.

[0044] Among them, at least one lamination assembly 30 includes at least two side pressing members 40 and at least one auxiliary pressing member 50, at least two side pressing members 40 are respectively arranged at the two ends of the second direction S of the working area Z, and the auxiliary pressing member 50 is arranged between the two ends of the second direction S of the working area Z. The second direction S is perpendicular to the first direction F and parallel to the working area Z of the lamination table 10.

[0045] At least one stacking assembly 30 includes at least two side pressing members 40 and at least one auxiliary pressing member 50, at least two side pressing members 40 are respectively arranged at the two ends of the second direction S of the working area Z, and all auxiliary pressing members 50 are arranged between the two ends of the second direction S of the working area Z. In this way, when the stacking assembly 30 is pressed on the diaphragm 22 or the pole piece 80 in the working area Z, the side pressing members 40 and the auxiliary pressing members 50 press the diaphragm 22 or the pole piece at the end and the middle position of the second direction S respectively. Compared with the case of pressing at only one position in the related art, the pressing positions are increased, the pressing force and the pressing area are increased, and the wrinkling of the diaphragm 22 is effectively improved. On the other hand, when the number of stacking layers is large, the middle part of the stacked cell is prone to arching. By setting the auxiliary pressing member 50 and pressing between the two ends of the second direction S of the working area Z, the wrinkling of the diaphragm 22 caused by the arching in the middle can be greatly alleviated, and the quality of the finished battery cell can be improved.

[0046] The upper surface of the laminating table 10 is formed with a bearing surface, and the working area Z is located on the bearing surface. The diaphragm conveying mechanism 20 may include, for example, a plurality of swing rollers 21, and the diaphragm 22 is stretched and wound between the plurality of swing rollers 21, the axis directions of the plurality of swing rollers 21 are parallel to the second direction S, and the swing rollers 21 can swing back and forth relative to the laminating table 10 along the first direction F, so that the diaphragm 22 is laid on the pole piece 80 arranged in the working area Z.

[0047] Furthermore, the two stacking assemblies 30 each include at least two side pressing members 40 and at least one auxiliary pressing member 50. With such a configuration, when the two stacking assemblies 30 alternately press the working area Z, each stacking assembly 30 can press the pole piece 80 or the diaphragm 22, so that the anti-wrinkle effect of the diaphragm 22 is better.

[0048] The number of auxiliary pressing members 50 included in the same lamination assembly 30 is more than two, and the more than two auxiliary pressing members 50 are arranged at intervals along the first direction F. In this way, pressing can be performed at multiple positions along the second direction S in the working area Z, the pressing area is larger, and the diaphragm 22 is less likely to wrinkle. More than two means that the number is greater than or equal to two.

[0049] Further, the number of auxiliary pressing members 50 included in the same lamination assembly 30 is two, and the two auxiliary pressing members 50 are arranged axially symmetrically with respect to the first axis, and the first axis passes through the center of the working area Z and is parallel to the first direction F. It can be understood that the embodiment of the present application is described by taking the example of a lamination assembly 30 including two auxiliary pressing members 50, and the case with other numbers is similar to this, and will not be repeated here.

[0050] Furthermore, the width of the pressing surface of the side pressing member 40 along the second direction S is 20 mm-30 mm, so that the side pressing member 40 has a sufficient pressing area.

[0051] In a specific implementation, both the side pressing member 40 and the auxiliary pressing member 50 can be pressing knives.

[0052] In the embodiment of the present application, each lamination assembly 30 includes a plurality of rotary cylinders 60 , and each side pressing member 40 and each auxiliary pressing member 50 included in the same lamination assembly 30 are each driven by a rotary cylinder 60 .

[0053] In a specific implementation, each lamination assembly 30 also includes a mounting plate. Each side pressing member 40 is connected to the corresponding rotary cylinder 60 via a mounting plate (not shown). Each auxiliary pressing member 50 is also connected to the corresponding rotary cylinder 60 via a mounting plate. In this way, the rotary cylinder 60 can rotate and rise and fall to drive the side pressing member 40 or the auxiliary pressing member 50 to press or pull out the working area Z. It should be noted that in order to avoid interference with the diaphragm conveying mechanism 20, when the auxiliary pressing member 50 on the same side as the swing roller 21 needs to be pulled out, the rotary cylinder 60 first drives the auxiliary pressing member 50 to rotate, and then descends and pulls it out. When the auxiliary pressing member 50 on the opposite side of the swing roller 21 needs to be pressed, the rotary cylinder 60 first drives the auxiliary pressing member 50 to rise, and then rotates and presses.

[0054] In the embodiment of the present application, the stacking machine 100 further includes two electrode sheet conveying mechanisms 70 and a controller (not shown). The two electrode sheet conveying mechanisms 70 are respectively arranged at the two side positions of the first direction F of the stacking platform 10, and the two electrode sheet conveying mechanisms 70 are respectively used to alternately convey the positive electrode sheet 81 or the negative electrode sheet 82 to the working area Z of the stacking platform 10. The controller is electrically connected to both the electrode sheet conveying mechanism 70 and the diaphragm conveying mechanism 20. The controller is used to control the two electrode sheet conveying mechanisms 70 and the diaphragm conveying mechanism 20 to alternately stack the diaphragm 22, the negative electrode sheet 82 and the positive electrode sheet 81 on the working area Z, thereby forming a stacked battery cell. In specific implementation, the controller can first control the diaphragm conveying mechanism 20 to lay the diaphragm 22 in the working area Z of the stacking table 10, and then control the electrode conveying mechanism 70 on one side to place the negative electrode sheet 82 on the diaphragm 22, control the diaphragm conveying mechanism 20 to lay the diaphragm 22 on the negative electrode sheet 82, and then control the electrode conveying mechanism 70 on the other side to place the positive electrode sheet 81 on the diaphragm 22, and so on to form a stacked battery cell.

[0055] Further, the side pressing member 40 and the auxiliary pressing member 50 included in one of the stacking assemblies 30 are defined as the first side pressing member 41 and the first auxiliary pressing member 51, respectively, and the side pressing member 40 and the auxiliary pressing member 50 included in the other stacking assembly 30 are defined as the second side pressing member 42 and the second auxiliary pressing member 52, respectively. The controller is also used to control the first side pressing member 41 and the first auxiliary pressing member 51 to press the negative electrode sheet 82 when stacking the negative electrode sheet 82, and to control the second side pressing member 42 and the second auxiliary pressing member 52 to press the positive electrode sheet 81 when stacking the positive electrode sheet 81. In this way, the first side pressing member 41 and the first auxiliary pressing member 51 can press the diaphragm 22 below the negative electrode sheet 82 through the negative electrode sheet 82 , and the second side pressing member 42 and the second auxiliary pressing member 52 can press the diaphragm 22 below the positive electrode sheet 81 through the positive electrode sheet 81 .

[0056] It can be understood that in order to avoid interfering with the reciprocating movement of the diaphragm conveying mechanism 20 along the first direction F, the controller is also used to pull out the auxiliary pressing member 50 located between the two ends of the working area Z in the first direction F when the diaphragm conveying mechanism 20 reciprocates along the first direction F relative to the stacking table 10 to lay the diaphragm 22.

[0057] Combine the following Figure 1 and Figure 2 , a specific example is given to illustrate the lamination process of the lamination machine 100 of the embodiment of the present application.

[0058] Step 1: Initial state:

[0059] The diaphragm conveying mechanism 20 is used to lay a layer of diaphragm 22 from left to right on the working area Z of the laminating table 10. After laying, the swing roller 21 of the diaphragm conveying mechanism 20 is on the right side. The first side pressing member 41 and the second side pressing member 42 are both pressed on the diaphragm 22, and the first auxiliary pressing member 51 and the second auxiliary pressing member 52 remain in the withdrawn state.

[0060] Step 2: The negative electrode sheet 82 is pressed onto the diaphragm 22 (from the left):

[0061] The negative electrode sheet 82 is stacked on the diaphragm 22 by using the electrode sheet conveying mechanism 70 on the left side. At this time, the first side pressing member 41 and the first auxiliary pressing member 51 are simultaneously pulled out and pressed on the negative electrode sheet 82. In this process, the two first side pressing members 41 and the two first auxiliary pressing members 51 press at a total of 4 positions, and the wrinkles of the diaphragm 22 are flattened through the negative electrode sheet 82. The first side pressing member 41 and the first auxiliary pressing member 51 press on the negative electrode sheet 82, the second auxiliary pressing member 52 remains pulled out, and the second side pressing member 42 presses on the bottom diaphragm 22.

[0062] Step 3: The swing roller 21 of the diaphragm conveying mechanism 20 moves from the right side to the left side, and the diaphragm 22 is laid on the negative electrode sheet 82:

[0063] Before the swing roller 21 moves, the first auxiliary pressing member 51 is pulled out to avoid interfering with the movement of the swing roller 21. At this time, the second side pressing member 42 is still pressed on the bottom diaphragm 22. The first side pressing member 41 is pressed on the negative electrode sheet 82, the first auxiliary pressing member 51 is pulled out, the second auxiliary pressing member 52 remains pulled out, and the second side pressing member 42 is pressed on the bottom diaphragm 22.

[0064] Step 4: Press the positive electrode sheet 81 (from the right side) onto the diaphragm 22:

[0065] The positive electrode sheet 81 is stacked on the diaphragm 22 by using the electrode sheet conveying mechanism on the right side. At this time, the second side pressing piece 42 and the second auxiliary pressing piece 52 are simultaneously pulled out and pressed on the positive electrode sheet 81. In this process, the two second side pressing pieces 42 and the two second auxiliary pressing pieces 52 press at a total of 4 positions, and the wrinkles of the newly laid diaphragm 22 are flattened by the positive electrode sheet 81. At this time, the first side pressing piece 41 is still pressed on the negative electrode sheet 82, the first auxiliary pressing piece 51 remains pulled out, and the second auxiliary pressing piece 52 and the second side pressing piece 42 press on the positive electrode sheet 81.

[0066] Step 5: The swing roller 21 of the diaphragm conveying mechanism 20 moves from the left side to the right side, and spreads the diaphragm 22 on the positive electrode sheet 81:

[0067] Before the swing roller 21 moves, the second auxiliary pressing member 52 is pulled out to avoid interference with the movement of the swing roller 21. At this time, the first auxiliary pressing member 51 remains pulled out, and the first side pressing member 41 still presses on the negative electrode sheet 82. In this way, the first side pressing member 41 presses on the negative electrode sheet 82, the first auxiliary pressing member 51 remains pulled out, the second auxiliary pressing member 52 is pulled out, and the second side pressing member 42 presses on the positive electrode sheet 81.

[0068] Step 6: The negative electrode sheet 82 is pressed on the diaphragm 22 (from the left): The negative electrode sheet 82 is stacked on the diaphragm 22 using the electrode sheet conveying mechanism 70 on the left. At this time, the first side pressing member 41 and the first auxiliary pressing member 51 are pressed on the negative electrode sheet 82 at the same time. In this process, the two first side pressing members 41 and the two first auxiliary pressing members 51 are pressed at a total of 4 positions, and the wrinkles of the diaphragm 22 are flattened through the negative electrode sheet 82. At this time, the first side pressing member 41 and the first auxiliary pressing member 51 are pressed on the negative electrode sheet 82, the second auxiliary pressing member 52 remains in the withdrawn state, and the second side pressing member 42 is pressed on the positive electrode sheet 81.

[0069] Then, step 3 to step 6 are repeated until the positive electrode sheets 81 and the negative electrode sheets 82 are stacked, and then the layers of the separators 22 are cut.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0071] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A lamination machine, characterized in that: include: Lamination table with work area; A diaphragm conveying mechanism is located above the lamination platform and reciprocates relative to the lamination platform in a first direction to lay the diaphragm on the working area of ​​the lamination platform; as well as Two laminate assemblies are respectively arranged at two ends of the working area in the first direction, and the two laminate assemblies are respectively used to alternately press the diaphragm or the pole piece in the working area; Among them, at least one lamination assembly includes at least two side pressing members and at least one auxiliary pressing member, the at least two side pressing members are respectively arranged at the two ends of the second direction of the working area, and the auxiliary pressing member is arranged between the two ends of the second direction of the working area, and the second direction is perpendicular to the first direction and parallel to the working area of ​​the lamination table.

2. The laminating machine according to claim 1, characterized in that: The two lamination assemblies each include at least two side pressing members and at least one auxiliary pressing member.

3. The laminating machine according to claim 2, characterized in that: The number of auxiliary pressing members included in the same lamination assembly is more than two, and the two or more auxiliary pressing members are arranged at intervals along the first direction.

4. The laminating machine according to claim 2, characterized in that: The width of the pressing surface of the side pressing piece along the second direction is 20 mm-30 mm.

5. The laminating machine according to claim 2, characterized in that: Each of the lamination assemblies comprises a plurality of rotating cylinders, and each of the side pressing members and each of the auxiliary pressing members included in the same lamination assembly is driven by each of the rotating cylinders.

6. The laminating machine according to claim 5, characterized in that: Each of the lamination assemblies also includes a mounting fixing plate; Each of the side pressing members is connected to the corresponding rotating cylinder via a mounting fixing plate; Each of the auxiliary pressing members is connected to the corresponding rotating cylinder via a mounting fixing plate.

7. The laminating machine according to any one of claims 2 to 6, characterized in that: The pole pieces include a positive pole piece and a negative pole piece; the laminating machine also includes: Two electrode sheet conveying mechanisms are respectively arranged on both sides of the lamination platform in the first direction, and the two electrode sheet conveying mechanisms are respectively used to alternately convey the positive electrode sheet or the negative electrode sheet to the working area of ​​the lamination platform; and A controller, electrically connected to the electrode conveying mechanism and the diaphragm conveying mechanism; The controller is used to control the two electrode sheet conveying mechanisms and the diaphragm conveying mechanism to alternately stack diaphragms, negative electrode sheets and positive electrode sheets on the working area to form a laminated battery cell.

8. The laminating machine according to claim 7, characterized in that: The side pressing member and the auxiliary pressing member included in one of the stacking assemblies are defined as a first side pressing member and a first auxiliary pressing member, respectively, and the side pressing member and the auxiliary pressing member included in the other stacking assembly are defined as a second side pressing member and a second auxiliary pressing member, respectively; The controller is further used to control the first side pressing member and the first auxiliary pressing member to press the negative electrode sheets when stacking the negative electrode sheets, and to control the second side pressing member and the second auxiliary pressing member to press the positive electrode sheets when stacking the positive electrode sheets.

9. The laminating machine according to claim 8, characterized in that: The controller is also used to extract the auxiliary pressing member located between two ends of the working area in the first direction when the diaphragm conveying mechanism reciprocates along the first direction relative to the laminating table to lay the diaphragm.

10. The laminating machine according to any one of claims 1 to 6, characterized in that: The membrane conveying mechanism includes a plurality of swing rollers, the membrane is wound around the plurality of swing rollers, and the axis directions of the plurality of swing rollers are parallel to the second direction.

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